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f5166768 1// SPDX-License-Identifier: GPL-2.0
ac27a0ec 2/*
617ba13b 3 * linux/fs/ext4/super.c
ac27a0ec
DK		 4 *
5 * Copyright (C) 1992, 1993, 1994, 1995
6 * Remy Card ([email protected])
7 * Laboratoire MASI - Institut Blaise Pascal
8 * Universite Pierre et Marie Curie (Paris VI)
9 *
10 * from
11 *
12 * linux/fs/minix/inode.c
13 *
14 * Copyright (C) 1991, 1992 Linus Torvalds
15 *
16 * Big-endian to little-endian byte-swapping/bitmaps by
17 * David S. Miller ([email protected]), 1995
18 */
19
20#include <linux/module.h>
21#include <linux/string.h>
22#include <linux/fs.h>
23#include <linux/time.h>
c5ca7c76 24#include <linux/vmalloc.h>
ac27a0ec
DK		 25#include <linux/slab.h>
26#include <linux/init.h>
27#include <linux/blkdev.h>
66114cad 28#include <linux/backing-dev.h>
ac27a0ec 29#include <linux/parser.h>
ac27a0ec 30#include <linux/buffer_head.h>
a5694255 31#include <linux/exportfs.h>
ac27a0ec
DK		 32#include <linux/vfs.h>
33#include <linux/random.h>
34#include <linux/mount.h>
35#include <linux/namei.h>
36#include <linux/quotaops.h>
37#include <linux/seq_file.h>
3197ebdb 38#include <linux/ctype.h>
1330593e 39#include <linux/log2.h>
717d50e4 40#include <linux/crc16.h>
ef510424 41#include <linux/dax.h>
7abc52c2 42#include <linux/cleancache.h>
7c0f6ba6 43#include <linux/uaccess.h>
ee73f9a5 44#include <linux/iversion.h>
ac27a0ec 45
bfff6873
LC		 46#include <linux/kthread.h>
47#include <linux/freezer.h>
48
3dcf5451 49#include "ext4.h"
4a092d73 50#include "ext4_extents.h" /* Needed for trace points definition */
3dcf5451 51#include "ext4_jbd2.h"
ac27a0ec
DK		 52#include "xattr.h"
53#include "acl.h"
3661d286 54#include "mballoc.h"
0c9ec4be 55#include "fsmap.h"
ac27a0ec 56
9bffad1e
TT		 57#define CREATE_TRACE_POINTS
58#include <trace/events/ext4.h>
59
0b75a840
LC		 60static struct ext4_lazy_init *ext4_li_info;
61static struct mutex ext4_li_mtx;
e294a537 62static struct ratelimit_state ext4_mount_msg_ratelimit;
9f6200bb 63
617ba13b 64static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
ac27a0ec 65 unsigned long journal_devnum);
2adf6da8 66static int ext4_show_options(struct seq_file *seq, struct dentry *root);
e2d67052 67static int ext4_commit_super(struct super_block *sb, int sync);
2b2d6d01
TT		 68static void ext4_mark_recovery_complete(struct super_block *sb,
69 struct ext4_super_block *es);
70static void ext4_clear_journal_err(struct super_block *sb,
71 struct ext4_super_block *es);
617ba13b 72static int ext4_sync_fs(struct super_block *sb, int wait);
2b2d6d01
TT		 73static int ext4_remount(struct super_block *sb, int *flags, char *data);
74static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
c4be0c1d 75static int ext4_unfreeze(struct super_block *sb);
c4be0c1d 76static int ext4_freeze(struct super_block *sb);
152a0836
AV		 77static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
78 const char *dev_name, void *data);
2035e776
TT		 79static inline int ext2_feature_set_ok(struct super_block *sb);
80static inline int ext3_feature_set_ok(struct super_block *sb);
d39195c3 81static int ext4_feature_set_ok(struct super_block *sb, int readonly);
bfff6873
LC		 82static void ext4_destroy_lazyinit_thread(void);
83static void ext4_unregister_li_request(struct super_block *sb);
8f1f7453 84static void ext4_clear_request_list(void);
c6cb7e77
EW		 85static struct inode *ext4_get_journal_inode(struct super_block *sb,
86 unsigned int journal_inum);
ac27a0ec 87
e74031fd
JK		 88/*
89 * Lock ordering
90 *
91 * Note the difference between i_mmap_sem (EXT4_I(inode)->i_mmap_sem) and
92 * i_mmap_rwsem (inode->i_mmap_rwsem)!
93 *
94 * page fault path:
95 * mmap_sem -> sb_start_pagefault -> i_mmap_sem (r) -> transaction start ->
96 * page lock -> i_data_sem (rw)
97 *
98 * buffered write path:
99 * sb_start_write -> i_mutex -> mmap_sem
100 * sb_start_write -> i_mutex -> transaction start -> page lock ->
101 * i_data_sem (rw)
102 *
103 * truncate:
1d39834f
NB		 104 * sb_start_write -> i_mutex -> i_mmap_sem (w) -> i_mmap_rwsem (w) -> page lock
105 * sb_start_write -> i_mutex -> i_mmap_sem (w) -> transaction start ->
106 * i_data_sem (rw)
e74031fd
JK		 107 *
108 * direct IO:
1d39834f
NB		 109 * sb_start_write -> i_mutex -> mmap_sem
110 * sb_start_write -> i_mutex -> transaction start -> i_data_sem (rw)
e74031fd
JK		 111 *
112 * writepages:
113 * transaction start -> page lock(s) -> i_data_sem (rw)
114 */
115
c290ea01 116#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2)
2035e776
TT		 117static struct file_system_type ext2_fs_type = {
118 .owner = THIS_MODULE,
119 .name = "ext2",
120 .mount = ext4_mount,
121 .kill_sb = kill_block_super,
122 .fs_flags = FS_REQUIRES_DEV,
123};
7f78e035 124MODULE_ALIAS_FS("ext2");
fa7614dd 125MODULE_ALIAS("ext2");
2035e776
TT		 126#define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type)
127#else
128#define IS_EXT2_SB(sb) (0)
129#endif
130
131
ba69f9ab
JK		 132static struct file_system_type ext3_fs_type = {
133 .owner = THIS_MODULE,
134 .name = "ext3",
152a0836 135 .mount = ext4_mount,
ba69f9ab
JK		 136 .kill_sb = kill_block_super,
137 .fs_flags = FS_REQUIRES_DEV,
138};
7f78e035 139MODULE_ALIAS_FS("ext3");
fa7614dd 140MODULE_ALIAS("ext3");
ba69f9ab 141#define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type)
bd81d8ee 142
fb265c9c
TT		 143/*
144 * This works like sb_bread() except it uses ERR_PTR for error
145 * returns. Currently with sb_bread it's impossible to distinguish
146 * between ENOMEM and EIO situations (since both result in a NULL
147 * return.
148 */
149struct buffer_head *
150ext4_sb_bread(struct super_block *sb, sector_t block, int op_flags)
151{
152 struct buffer_head *bh = sb_getblk(sb, block);
153
154 if (bh == NULL)
155 return ERR_PTR(-ENOMEM);
156 if (buffer_uptodate(bh))
157 return bh;
158 ll_rw_block(REQ_OP_READ, REQ_META | op_flags, 1, &bh);
159 wait_on_buffer(bh);
160 if (buffer_uptodate(bh))
161 return bh;
162 put_bh(bh);
163 return ERR_PTR(-EIO);
164}
165
d25425f8
DW		 166static int ext4_verify_csum_type(struct super_block *sb,
167 struct ext4_super_block *es)
168{
e2b911c5 169 if (!ext4_has_feature_metadata_csum(sb))
d25425f8
DW		 170 return 1;
171
172 return es->s_checksum_type == EXT4_CRC32C_CHKSUM;
173}
174
a9c47317
DW		 175static __le32 ext4_superblock_csum(struct super_block *sb,
176 struct ext4_super_block *es)
177{
178 struct ext4_sb_info *sbi = EXT4_SB(sb);
179 int offset = offsetof(struct ext4_super_block, s_checksum);
180 __u32 csum;
181
182 csum = ext4_chksum(sbi, ~0, (char *)es, offset);
183
184 return cpu_to_le32(csum);
185}
186
c197855e
SH		 187static int ext4_superblock_csum_verify(struct super_block *sb,
188 struct ext4_super_block *es)
a9c47317 189{
9aa5d32b 190 if (!ext4_has_metadata_csum(sb))
a9c47317
DW		 191 return 1;
192
193 return es->s_checksum == ext4_superblock_csum(sb, es);
194}
195
06db49e6 196void ext4_superblock_csum_set(struct super_block *sb)
a9c47317 197{
06db49e6
TT		 198 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
199
9aa5d32b 200 if (!ext4_has_metadata_csum(sb))
a9c47317
DW		 201 return;
202
203 es->s_checksum = ext4_superblock_csum(sb, es);
204}
205
9933fc0a
TT		 206void *ext4_kvmalloc(size_t size, gfp_t flags)
207{
208 void *ret;
209
8be04b93 210 ret = kmalloc(size, flags | __GFP_NOWARN);
9933fc0a
TT		 211 if (!ret)
212 ret = __vmalloc(size, flags, PAGE_KERNEL);
213 return ret;
214}
215
216void *ext4_kvzalloc(size_t size, gfp_t flags)
217{
218 void *ret;
219
8be04b93 220 ret = kzalloc(size, flags | __GFP_NOWARN);
9933fc0a
TT		 221 if (!ret)
222 ret = __vmalloc(size, flags | __GFP_ZERO, PAGE_KERNEL);
223 return ret;
224}
225
8fadc143
AR		 226ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
227 struct ext4_group_desc *bg)
bd81d8ee 228{
3a14589c 229 return le32_to_cpu(bg->bg_block_bitmap_lo) |
8fadc143 230 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 231 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 232}
233
8fadc143
AR		 234ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
235 struct ext4_group_desc *bg)
bd81d8ee 236{
5272f837 237 return le32_to_cpu(bg->bg_inode_bitmap_lo) |
8fadc143 238 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 239 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 240}
241
8fadc143
AR		 242ext4_fsblk_t ext4_inode_table(struct super_block *sb,
243 struct ext4_group_desc *bg)
bd81d8ee 244{
5272f837 245 return le32_to_cpu(bg->bg_inode_table_lo) |
8fadc143 246 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 247 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
bd81d8ee
LV		 248}
249
021b65bb
TT		 250__u32 ext4_free_group_clusters(struct super_block *sb,
251 struct ext4_group_desc *bg)
560671a0
AK		 252{
253 return le16_to_cpu(bg->bg_free_blocks_count_lo) |
254 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 255 (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0);
560671a0
AK		 256}
257
258__u32 ext4_free_inodes_count(struct super_block *sb,
259 struct ext4_group_desc *bg)
260{
261 return le16_to_cpu(bg->bg_free_inodes_count_lo) |
262 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 263 (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0);
560671a0
AK		 264}
265
266__u32 ext4_used_dirs_count(struct super_block *sb,
267 struct ext4_group_desc *bg)
268{
269 return le16_to_cpu(bg->bg_used_dirs_count_lo) |
270 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 271 (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0);
560671a0
AK		 272}
273
274__u32 ext4_itable_unused_count(struct super_block *sb,
275 struct ext4_group_desc *bg)
276{
277 return le16_to_cpu(bg->bg_itable_unused_lo) |
278 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 279 (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0);
560671a0
AK		 280}
281
8fadc143
AR		 282void ext4_block_bitmap_set(struct super_block *sb,
283 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 284{
3a14589c 285 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 286 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
287 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 288}
289
8fadc143
AR		 290void ext4_inode_bitmap_set(struct super_block *sb,
291 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 292{
5272f837 293 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 294 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
295 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 296}
297
8fadc143
AR		 298void ext4_inode_table_set(struct super_block *sb,
299 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 300{
5272f837 301 bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 302 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
303 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 304}
305
021b65bb
TT		 306void ext4_free_group_clusters_set(struct super_block *sb,
307 struct ext4_group_desc *bg, __u32 count)
560671a0
AK		 308{
309 bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count);
310 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
311 bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16);
312}
313
314void ext4_free_inodes_set(struct super_block *sb,
315 struct ext4_group_desc *bg, __u32 count)
316{
317 bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count);
318 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
319 bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16);
320}
321
322void ext4_used_dirs_set(struct super_block *sb,
323 struct ext4_group_desc *bg, __u32 count)
324{
325 bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count);
326 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
327 bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16);
328}
329
330void ext4_itable_unused_set(struct super_block *sb,
331 struct ext4_group_desc *bg, __u32 count)
332{
333 bg->bg_itable_unused_lo = cpu_to_le16((__u16)count);
334 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
335 bg->bg_itable_unused_hi = cpu_to_le16(count >> 16);
336}
337
6a0678a7
AB		 338static void __ext4_update_tstamp(__le32 *lo, __u8 *hi)
339{
340 time64_t now = ktime_get_real_seconds();
341
342 now = clamp_val(now, 0, (1ull << 40) - 1);
343
344 *lo = cpu_to_le32(lower_32_bits(now));
345 *hi = upper_32_bits(now);
346}
347
348static time64_t __ext4_get_tstamp(__le32 *lo, __u8 *hi)
349{
350 return ((time64_t)(*hi) << 32) + le32_to_cpu(*lo);
351}
352#define ext4_update_tstamp(es, tstamp) \
353 __ext4_update_tstamp(&(es)->tstamp, &(es)->tstamp ## _hi)
354#define ext4_get_tstamp(es, tstamp) \
355 __ext4_get_tstamp(&(es)->tstamp, &(es)->tstamp ## _hi)
d3d1faf6 356
1c13d5c0
TT		 357static void __save_error_info(struct super_block *sb, const char *func,
358 unsigned int line)
359{
360 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
361
362 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
1b46617b
TT		 363 if (bdev_read_only(sb->s_bdev))
364 return;
1c13d5c0 365 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
6a0678a7 366 ext4_update_tstamp(es, s_last_error_time);
1c13d5c0
TT		 367 strncpy(es->s_last_error_func, func, sizeof(es->s_last_error_func));
368 es->s_last_error_line = cpu_to_le32(line);
369 if (!es->s_first_error_time) {
370 es->s_first_error_time = es->s_last_error_time;
6a0678a7 371 es->s_first_error_time_hi = es->s_last_error_time_hi;
1c13d5c0
TT		 372 strncpy(es->s_first_error_func, func,
373 sizeof(es->s_first_error_func));
374 es->s_first_error_line = cpu_to_le32(line);
375 es->s_first_error_ino = es->s_last_error_ino;
376 es->s_first_error_block = es->s_last_error_block;
377 }
66e61a9e
TT		 378 /*
379 * Start the daily error reporting function if it hasn't been
380 * started already
381 */
382 if (!es->s_error_count)
383 mod_timer(&EXT4_SB(sb)->s_err_report, jiffies + 24*60*60*HZ);
ba39ebb6 384 le32_add_cpu(&es->s_error_count, 1);
1c13d5c0
TT		 385}
386
387static void save_error_info(struct super_block *sb, const char *func,
388 unsigned int line)
389{
390 __save_error_info(sb, func, line);
391 ext4_commit_super(sb, 1);
392}
393
bdfe0cbd
TT		 394/*
395 * The del_gendisk() function uninitializes the disk-specific data
396 * structures, including the bdi structure, without telling anyone
397 * else. Once this happens, any attempt to call mark_buffer_dirty()
398 * (for example, by ext4_commit_super), will cause a kernel OOPS.
399 * This is a kludge to prevent these oops until we can put in a proper
400 * hook in del_gendisk() to inform the VFS and file system layers.
401 */
402static int block_device_ejected(struct super_block *sb)
403{
404 struct inode *bd_inode = sb->s_bdev->bd_inode;
405 struct backing_dev_info *bdi = inode_to_bdi(bd_inode);
406
407 return bdi->dev == NULL;
408}
409
18aadd47
BJ		 410static void ext4_journal_commit_callback(journal_t *journal, transaction_t *txn)
411{
412 struct super_block *sb = journal->j_private;
413 struct ext4_sb_info *sbi = EXT4_SB(sb);
414 int error = is_journal_aborted(journal);
5d3ee208 415 struct ext4_journal_cb_entry *jce;
18aadd47 416
5d3ee208 417 BUG_ON(txn->t_state == T_FINISHED);
a0154344
DJ		 418
419 ext4_process_freed_data(sb, txn->t_tid);
420
18aadd47 421 spin_lock(&sbi->s_md_lock);
5d3ee208
DM		 422 while (!list_empty(&txn->t_private_list)) {
423 jce = list_entry(txn->t_private_list.next,
424 struct ext4_journal_cb_entry, jce_list);
18aadd47
BJ		 425 list_del_init(&jce->jce_list);
426 spin_unlock(&sbi->s_md_lock);
427 jce->jce_func(sb, jce, error);
428 spin_lock(&sbi->s_md_lock);
429 }
430 spin_unlock(&sbi->s_md_lock);
431}
1c13d5c0 432
1dc1097f
JK		 433static bool system_going_down(void)
434{
435 return system_state == SYSTEM_HALT || system_state == SYSTEM_POWER_OFF
436 || system_state == SYSTEM_RESTART;
437}
438
ac27a0ec
DK		 439/* Deal with the reporting of failure conditions on a filesystem such as
440 * inconsistencies detected or read IO failures.
441 *
442 * On ext2, we can store the error state of the filesystem in the
617ba13b 443 * superblock. That is not possible on ext4, because we may have other
ac27a0ec
DK		 444 * write ordering constraints on the superblock which prevent us from
445 * writing it out straight away; and given that the journal is about to
446 * be aborted, we can't rely on the current, or future, transactions to
447 * write out the superblock safely.
448 *
dab291af 449 * We'll just use the jbd2_journal_abort() error code to record an error in
d6b198bc 450 * the journal instead. On recovery, the journal will complain about
ac27a0ec
DK		 451 * that error until we've noted it down and cleared it.
452 */
453
617ba13b 454static void ext4_handle_error(struct super_block *sb)
ac27a0ec 455{
327eaf73
TT		 456 if (test_opt(sb, WARN_ON_ERROR))
457 WARN_ON_ONCE(1);
458
bc98a42c 459 if (sb_rdonly(sb))
ac27a0ec
DK		 460 return;
461
2b2d6d01 462 if (!test_opt(sb, ERRORS_CONT)) {
617ba13b 463 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 464
4ab2f15b 465 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
ac27a0ec 466 if (journal)
dab291af 467 jbd2_journal_abort(journal, -EIO);
ac27a0ec 468 }
1dc1097f
JK		 469 /*
470 * We force ERRORS_RO behavior when system is rebooting. Otherwise we
471 * could panic during 'reboot -f' as the underlying device got already
472 * disabled.
473 */
474 if (test_opt(sb, ERRORS_RO) || system_going_down()) {
b31e1552 475 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
4418e141
DM		 476 /*
477 * Make sure updated value of ->s_mount_flags will be visible
478 * before ->s_flags update
479 */
480 smp_wmb();
1751e8a6 481 sb->s_flags |= SB_RDONLY;
1dc1097f 482 } else if (test_opt(sb, ERRORS_PANIC)) {
4327ba52
DJ		 483 if (EXT4_SB(sb)->s_journal &&
484 !(EXT4_SB(sb)->s_journal->j_flags & JBD2_REC_ERR))
485 return;
617ba13b 486 panic("EXT4-fs (device %s): panic forced after error\n",
ac27a0ec 487 sb->s_id);
4327ba52 488 }
ac27a0ec
DK		 489}
490
efbed4dc
TT		 491#define ext4_error_ratelimit(sb) \
492 ___ratelimit(&(EXT4_SB(sb)->s_err_ratelimit_state), \
493 "EXT4-fs error")
494
12062ddd 495void __ext4_error(struct super_block *sb, const char *function,
c398eda0 496 unsigned int line, const char *fmt, ...)
ac27a0ec 497{
0ff2ea7d 498 struct va_format vaf;
ac27a0ec
DK		 499 va_list args;
500
0db1ff22
TT		 501 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
502 return;
503
ccf0f32a 504 trace_ext4_error(sb, function, line);
efbed4dc
TT		 505 if (ext4_error_ratelimit(sb)) {
506 va_start(args, fmt);
507 vaf.fmt = fmt;
508 vaf.va = &args;
509 printk(KERN_CRIT
510 "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n",
511 sb->s_id, function, line, current->comm, &vaf);
512 va_end(args);
513 }
f3fc0210 514 save_error_info(sb, function, line);
617ba13b 515 ext4_handle_error(sb);
ac27a0ec
DK		 516}
517
e7c96e8e
JP		 518void __ext4_error_inode(struct inode *inode, const char *function,
519 unsigned int line, ext4_fsblk_t block,
520 const char *fmt, ...)
273df556
FM		 521{
522 va_list args;
f7c21177 523 struct va_format vaf;
1c13d5c0 524 struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
273df556 525
0db1ff22
TT		 526 if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
527 return;
528
ccf0f32a 529 trace_ext4_error(inode->i_sb, function, line);
1c13d5c0
TT		 530 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
531 es->s_last_error_block = cpu_to_le64(block);
efbed4dc
TT		 532 if (ext4_error_ratelimit(inode->i_sb)) {
533 va_start(args, fmt);
534 vaf.fmt = fmt;
535 vaf.va = &args;
536 if (block)
537 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
538 "inode #%lu: block %llu: comm %s: %pV\n",
539 inode->i_sb->s_id, function, line, inode->i_ino,
540 block, current->comm, &vaf);
541 else
542 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
543 "inode #%lu: comm %s: %pV\n",
544 inode->i_sb->s_id, function, line, inode->i_ino,
545 current->comm, &vaf);
546 va_end(args);
547 }
1c13d5c0 548 save_error_info(inode->i_sb, function, line);
273df556
FM		 549 ext4_handle_error(inode->i_sb);
550}
551
e7c96e8e
JP		 552void __ext4_error_file(struct file *file, const char *function,
553 unsigned int line, ext4_fsblk_t block,
554 const char *fmt, ...)
273df556
FM		 555{
556 va_list args;
f7c21177 557 struct va_format vaf;
1c13d5c0 558 struct ext4_super_block *es;
496ad9aa 559 struct inode *inode = file_inode(file);
273df556
FM		 560 char pathname[80], *path;
561
0db1ff22
TT		 562 if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
563 return;
564
ccf0f32a 565 trace_ext4_error(inode->i_sb, function, line);
1c13d5c0
TT		 566 es = EXT4_SB(inode->i_sb)->s_es;
567 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
efbed4dc 568 if (ext4_error_ratelimit(inode->i_sb)) {
9bf39ab2 569 path = file_path(file, pathname, sizeof(pathname));
efbed4dc
TT		 570 if (IS_ERR(path))
571 path = "(unknown)";
572 va_start(args, fmt);
573 vaf.fmt = fmt;
574 vaf.va = &args;
575 if (block)
576 printk(KERN_CRIT
577 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
578 "block %llu: comm %s: path %s: %pV\n",
579 inode->i_sb->s_id, function, line, inode->i_ino,
580 block, current->comm, path, &vaf);
581 else
582 printk(KERN_CRIT
583 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
584 "comm %s: path %s: %pV\n",
585 inode->i_sb->s_id, function, line, inode->i_ino,
586 current->comm, path, &vaf);
587 va_end(args);
588 }
1c13d5c0 589 save_error_info(inode->i_sb, function, line);
273df556
FM		 590 ext4_handle_error(inode->i_sb);
591}
592
722887dd
TT		 593const char *ext4_decode_error(struct super_block *sb, int errno,
594 char nbuf[16])
ac27a0ec
DK		 595{
596 char *errstr = NULL;
597
598 switch (errno) {
6a797d27
DW		 599 case -EFSCORRUPTED:
600 errstr = "Corrupt filesystem";
601 break;
602 case -EFSBADCRC:
603 errstr = "Filesystem failed CRC";
604 break;
ac27a0ec
DK		 605 case -EIO:
606 errstr = "IO failure";
607 break;
608 case -ENOMEM:
609 errstr = "Out of memory";
610 break;
611 case -EROFS:
78f1ddbb
TT		 612 if (!sb || (EXT4_SB(sb)->s_journal &&
613 EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT))
ac27a0ec
DK		 614 errstr = "Journal has aborted";
615 else
616 errstr = "Readonly filesystem";
617 break;
618 default:
619 /* If the caller passed in an extra buffer for unknown
620 * errors, textualise them now. Else we just return
621 * NULL. */
622 if (nbuf) {
623 /* Check for truncated error codes... */
624 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
625 errstr = nbuf;
626 }
627 break;
628 }
629
630 return errstr;
631}
632
617ba13b 633/* __ext4_std_error decodes expected errors from journaling functions
ac27a0ec
DK		 634 * automatically and invokes the appropriate error response. */
635
c398eda0
TT		 636void __ext4_std_error(struct super_block *sb, const char *function,
637 unsigned int line, int errno)
ac27a0ec
DK		 638{
639 char nbuf[16];
640 const char *errstr;
641
0db1ff22
TT		 642 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
643 return;
644
ac27a0ec
DK		 645 /* Special case: if the error is EROFS, and we're not already
646 * inside a transaction, then there's really no point in logging
647 * an error. */
bc98a42c 648 if (errno == -EROFS && journal_current_handle() == NULL && sb_rdonly(sb))
ac27a0ec
DK		 649 return;
650
efbed4dc
TT		 651 if (ext4_error_ratelimit(sb)) {
652 errstr = ext4_decode_error(sb, errno, nbuf);
653 printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n",
654 sb->s_id, function, line, errstr);
655 }
ac27a0ec 656
efbed4dc 657 save_error_info(sb, function, line);
617ba13b 658 ext4_handle_error(sb);
ac27a0ec
DK		 659}
660
661/*
617ba13b 662 * ext4_abort is a much stronger failure handler than ext4_error. The
ac27a0ec
DK		 663 * abort function may be used to deal with unrecoverable failures such
664 * as journal IO errors or ENOMEM at a critical moment in log management.
665 *
666 * We unconditionally force the filesystem into an ABORT|READONLY state,
667 * unless the error response on the fs has been set to panic in which
668 * case we take the easy way out and panic immediately.
669 */
670
c67d859e 671void __ext4_abort(struct super_block *sb, const char *function,
c398eda0 672 unsigned int line, const char *fmt, ...)
ac27a0ec 673{
651e1c3b 674 struct va_format vaf;
ac27a0ec
DK		 675 va_list args;
676
0db1ff22
TT		 677 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
678 return;
679
1c13d5c0 680 save_error_info(sb, function, line);
ac27a0ec 681 va_start(args, fmt);
651e1c3b
JP		 682 vaf.fmt = fmt;
683 vaf.va = &args;
684 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: %pV\n",
685 sb->s_id, function, line, &vaf);
ac27a0ec
DK		 686 va_end(args);
687
bc98a42c 688 if (sb_rdonly(sb) == 0) {
1c13d5c0 689 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
1c13d5c0 690 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
4418e141
DM		 691 /*
692 * Make sure updated value of ->s_mount_flags will be visible
693 * before ->s_flags update
694 */
695 smp_wmb();
1751e8a6 696 sb->s_flags |= SB_RDONLY;
1c13d5c0
TT		 697 if (EXT4_SB(sb)->s_journal)
698 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
699 save_error_info(sb, function, line);
700 }
4327ba52
DJ		 701 if (test_opt(sb, ERRORS_PANIC)) {
702 if (EXT4_SB(sb)->s_journal &&
703 !(EXT4_SB(sb)->s_journal->j_flags & JBD2_REC_ERR))
704 return;
617ba13b 705 panic("EXT4-fs panic from previous error\n");
4327ba52 706 }
ac27a0ec
DK		 707}
708
e7c96e8e
JP		 709void __ext4_msg(struct super_block *sb,
710 const char *prefix, const char *fmt, ...)
b31e1552 711{
0ff2ea7d 712 struct va_format vaf;
b31e1552
ES		 713 va_list args;
714
efbed4dc
TT		 715 if (!___ratelimit(&(EXT4_SB(sb)->s_msg_ratelimit_state), "EXT4-fs"))
716 return;
717
b31e1552 718 va_start(args, fmt);
0ff2ea7d
JP		 719 vaf.fmt = fmt;
720 vaf.va = &args;
721 printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
b31e1552
ES		 722 va_end(args);
723}
724
b03a2f7e
AD		 725#define ext4_warning_ratelimit(sb) \
726 ___ratelimit(&(EXT4_SB(sb)->s_warning_ratelimit_state), \
727 "EXT4-fs warning")
728
12062ddd 729void __ext4_warning(struct super_block *sb, const char *function,
c398eda0 730 unsigned int line, const char *fmt, ...)
ac27a0ec 731{
0ff2ea7d 732 struct va_format vaf;
ac27a0ec
DK		 733 va_list args;
734
b03a2f7e 735 if (!ext4_warning_ratelimit(sb))
efbed4dc
TT		 736 return;
737
ac27a0ec 738 va_start(args, fmt);
0ff2ea7d
JP		 739 vaf.fmt = fmt;
740 vaf.va = &args;
741 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: %pV\n",
742 sb->s_id, function, line, &vaf);
ac27a0ec
DK		 743 va_end(args);
744}
745
b03a2f7e
AD		 746void __ext4_warning_inode(const struct inode *inode, const char *function,
747 unsigned int line, const char *fmt, ...)
748{
749 struct va_format vaf;
750 va_list args;
751
752 if (!ext4_warning_ratelimit(inode->i_sb))
753 return;
754
755 va_start(args, fmt);
756 vaf.fmt = fmt;
757 vaf.va = &args;
758 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: "
759 "inode #%lu: comm %s: %pV\n", inode->i_sb->s_id,
760 function, line, inode->i_ino, current->comm, &vaf);
761 va_end(args);
762}
763
e29136f8
TT		 764void __ext4_grp_locked_error(const char *function, unsigned int line,
765 struct super_block *sb, ext4_group_t grp,
766 unsigned long ino, ext4_fsblk_t block,
767 const char *fmt, ...)
5d1b1b3f
AK		 768__releases(bitlock)
769__acquires(bitlock)
770{
0ff2ea7d 771 struct va_format vaf;
5d1b1b3f
AK		 772 va_list args;
773 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
774
0db1ff22
TT		 775 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
776 return;
777
ccf0f32a 778 trace_ext4_error(sb, function, line);
1c13d5c0
TT		 779 es->s_last_error_ino = cpu_to_le32(ino);
780 es->s_last_error_block = cpu_to_le64(block);
781 __save_error_info(sb, function, line);
0ff2ea7d 782
efbed4dc
TT		 783 if (ext4_error_ratelimit(sb)) {
784 va_start(args, fmt);
785 vaf.fmt = fmt;
786 vaf.va = &args;
787 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u, ",
788 sb->s_id, function, line, grp);
789 if (ino)
790 printk(KERN_CONT "inode %lu: ", ino);
791 if (block)
792 printk(KERN_CONT "block %llu:",
793 (unsigned long long) block);
794 printk(KERN_CONT "%pV\n", &vaf);
795 va_end(args);
796 }
5d1b1b3f 797
327eaf73
TT		 798 if (test_opt(sb, WARN_ON_ERROR))
799 WARN_ON_ONCE(1);
800
5d1b1b3f 801 if (test_opt(sb, ERRORS_CONT)) {
e2d67052 802 ext4_commit_super(sb, 0);
5d1b1b3f
AK		 803 return;
804 }
1c13d5c0 805
5d1b1b3f 806 ext4_unlock_group(sb, grp);
06f29cc8 807 ext4_commit_super(sb, 1);
5d1b1b3f
AK		 808 ext4_handle_error(sb);
809 /*
810 * We only get here in the ERRORS_RO case; relocking the group
811 * may be dangerous, but nothing bad will happen since the
812 * filesystem will have already been marked read/only and the
813 * journal has been aborted. We return 1 as a hint to callers
814 * who might what to use the return value from
25985edc 815 * ext4_grp_locked_error() to distinguish between the
5d1b1b3f
AK		 816 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
817 * aggressively from the ext4 function in question, with a
818 * more appropriate error code.
819 */
820 ext4_lock_group(sb, grp);
821 return;
822}
823
db79e6d1
WS		 824void ext4_mark_group_bitmap_corrupted(struct super_block *sb,
825 ext4_group_t group,
826 unsigned int flags)
827{
828 struct ext4_sb_info *sbi = EXT4_SB(sb);
829 struct ext4_group_info *grp = ext4_get_group_info(sb, group);
830 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, group, NULL);
9af0b3d1
WS		 831 int ret;
832
833 if (flags & EXT4_GROUP_INFO_BBITMAP_CORRUPT) {
834 ret = ext4_test_and_set_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT,
835 &grp->bb_state);
836 if (!ret)
837 percpu_counter_sub(&sbi->s_freeclusters_counter,
838 grp->bb_free);
db79e6d1
WS		 839 }
840
9af0b3d1
WS		 841 if (flags & EXT4_GROUP_INFO_IBITMAP_CORRUPT) {
842 ret = ext4_test_and_set_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT,
843 &grp->bb_state);
844 if (!ret && gdp) {
db79e6d1
WS		 845 int count;
846
847 count = ext4_free_inodes_count(sb, gdp);
848 percpu_counter_sub(&sbi->s_freeinodes_counter,
849 count);
850 }
db79e6d1
WS		 851 }
852}
853
617ba13b 854void ext4_update_dynamic_rev(struct super_block *sb)
ac27a0ec 855{
617ba13b 856 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
ac27a0ec 857
617ba13b 858 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
ac27a0ec
DK		 859 return;
860
12062ddd 861 ext4_warning(sb,
ac27a0ec
DK		 862 "updating to rev %d because of new feature flag, "
863 "running e2fsck is recommended",
617ba13b 864 EXT4_DYNAMIC_REV);
ac27a0ec 865
617ba13b
MC		 866 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
867 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
868 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
ac27a0ec
DK		 869 /* leave es->s_feature_*compat flags alone */
870 /* es->s_uuid will be set by e2fsck if empty */
871
872 /*
873 * The rest of the superblock fields should be zero, and if not it
874 * means they are likely already in use, so leave them alone. We
875 * can leave it up to e2fsck to clean up any inconsistencies there.
876 */
877}
878
879/*
880 * Open the external journal device
881 */
b31e1552 882static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb)
ac27a0ec
DK		 883{
884 struct block_device *bdev;
885 char b[BDEVNAME_SIZE];
886
d4d77629 887 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
ac27a0ec
DK		 888 if (IS_ERR(bdev))
889 goto fail;
890 return bdev;
891
892fail:
b31e1552 893 ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld",
ac27a0ec
DK		 894 __bdevname(dev, b), PTR_ERR(bdev));
895 return NULL;
896}
897
898/*
899 * Release the journal device
900 */
4385bab1 901static void ext4_blkdev_put(struct block_device *bdev)
ac27a0ec 902{
4385bab1 903 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
ac27a0ec
DK		 904}
905
4385bab1 906static void ext4_blkdev_remove(struct ext4_sb_info *sbi)
ac27a0ec
DK		 907{
908 struct block_device *bdev;
ac27a0ec
DK		 909 bdev = sbi->journal_bdev;
910 if (bdev) {
4385bab1 911 ext4_blkdev_put(bdev);
ac27a0ec
DK		 912 sbi->journal_bdev = NULL;
913 }
ac27a0ec
DK		 914}
915
916static inline struct inode *orphan_list_entry(struct list_head *l)
917{
617ba13b 918 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
ac27a0ec
DK		 919}
920
617ba13b 921static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
ac27a0ec
DK		 922{
923 struct list_head *l;
924
b31e1552
ES		 925 ext4_msg(sb, KERN_ERR, "sb orphan head is %d",
926 le32_to_cpu(sbi->s_es->s_last_orphan));
ac27a0ec
DK		 927
928 printk(KERN_ERR "sb_info orphan list:\n");
929 list_for_each(l, &sbi->s_orphan) {
930 struct inode *inode = orphan_list_entry(l);
931 printk(KERN_ERR " "
932 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
933 inode->i_sb->s_id, inode->i_ino, inode,
934 inode->i_mode, inode->i_nlink,
935 NEXT_ORPHAN(inode));
936 }
937}
938
957153fc
JK		 939#ifdef CONFIG_QUOTA
940static int ext4_quota_off(struct super_block *sb, int type);
941
942static inline void ext4_quota_off_umount(struct super_block *sb)
943{
944 int type;
945
964edf66
JK		 946 /* Use our quota_off function to clear inode flags etc. */
947 for (type = 0; type < EXT4_MAXQUOTAS; type++)
948 ext4_quota_off(sb, type);
957153fc 949}
33458eab
TT		 950
951/*
952 * This is a helper function which is used in the mount/remount
953 * codepaths (which holds s_umount) to fetch the quota file name.
954 */
955static inline char *get_qf_name(struct super_block *sb,
956 struct ext4_sb_info *sbi,
957 int type)
958{
959 return rcu_dereference_protected(sbi->s_qf_names[type],
960 lockdep_is_held(&sb->s_umount));
961}
957153fc
JK		 962#else
963static inline void ext4_quota_off_umount(struct super_block *sb)
964{
965}
966#endif
967
2b2d6d01 968static void ext4_put_super(struct super_block *sb)
ac27a0ec 969{
617ba13b
MC		 970 struct ext4_sb_info *sbi = EXT4_SB(sb);
971 struct ext4_super_block *es = sbi->s_es;
97abd7d4 972 int aborted = 0;
ef2cabf7 973 int i, err;
ac27a0ec 974
857ac889 975 ext4_unregister_li_request(sb);
957153fc 976 ext4_quota_off_umount(sb);
e0ccfd95 977
2e8fa54e 978 destroy_workqueue(sbi->rsv_conversion_wq);
4c0425ff 979
0390131b 980 if (sbi->s_journal) {
97abd7d4 981 aborted = is_journal_aborted(sbi->s_journal);
0390131b
FM		 982 err = jbd2_journal_destroy(sbi->s_journal);
983 sbi->s_journal = NULL;
97abd7d4 984 if ((err < 0) && !aborted)
c67d859e 985 ext4_abort(sb, "Couldn't clean up the journal");
0390131b 986 }
d4edac31 987
ebd173be 988 ext4_unregister_sysfs(sb);
d3922a77 989 ext4_es_unregister_shrinker(sbi);
9105bb14 990 del_timer_sync(&sbi->s_err_report);
d4edac31
JB		 991 ext4_release_system_zone(sb);
992 ext4_mb_release(sb);
993 ext4_ext_release(sb);
d4edac31 994
bc98a42c 995 if (!sb_rdonly(sb) && !aborted) {
e2b911c5 996 ext4_clear_feature_journal_needs_recovery(sb);
ac27a0ec 997 es->s_state = cpu_to_le16(sbi->s_mount_state);
ac27a0ec 998 }
bc98a42c 999 if (!sb_rdonly(sb))
a8e25a83
AB		 1000 ext4_commit_super(sb, 1);
1001
ac27a0ec
DK		 1002 for (i = 0; i < sbi->s_gdb_count; i++)
1003 brelse(sbi->s_group_desc[i]);
b93b41d4
AV		 1004 kvfree(sbi->s_group_desc);
1005 kvfree(sbi->s_flex_groups);
57042651 1006 percpu_counter_destroy(&sbi->s_freeclusters_counter);
ac27a0ec
DK		 1007 percpu_counter_destroy(&sbi->s_freeinodes_counter);
1008 percpu_counter_destroy(&sbi->s_dirs_counter);
57042651 1009 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
c8585c6f 1010 percpu_free_rwsem(&sbi->s_journal_flag_rwsem);
ac27a0ec 1011#ifdef CONFIG_QUOTA
a2d4a646 1012 for (i = 0; i < EXT4_MAXQUOTAS; i++)
33458eab 1013 kfree(get_qf_name(sb, sbi, i));
ac27a0ec
DK		 1014#endif
1015
1016 /* Debugging code just in case the in-memory inode orphan list
1017 * isn't empty. The on-disk one can be non-empty if we've
1018 * detected an error and taken the fs readonly, but the
1019 * in-memory list had better be clean by this point. */
1020 if (!list_empty(&sbi->s_orphan))
1021 dump_orphan_list(sb, sbi);
1022 J_ASSERT(list_empty(&sbi->s_orphan));
1023
89d96a6f 1024 sync_blockdev(sb->s_bdev);
f98393a6 1025 invalidate_bdev(sb->s_bdev);
ac27a0ec
DK		 1026 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
1027 /*
1028 * Invalidate the journal device's buffers. We don't want them
1029 * floating about in memory - the physical journal device may
1030 * hotswapped, and it breaks the `ro-after' testing code.
1031 */
1032 sync_blockdev(sbi->journal_bdev);
f98393a6 1033 invalidate_bdev(sbi->journal_bdev);
617ba13b 1034 ext4_blkdev_remove(sbi);
ac27a0ec 1035 }
50c15df6
CX		 1036
1037 ext4_xattr_destroy_cache(sbi->s_ea_inode_cache);
1038 sbi->s_ea_inode_cache = NULL;
1039
1040 ext4_xattr_destroy_cache(sbi->s_ea_block_cache);
1041 sbi->s_ea_block_cache = NULL;
1042
c5e06d10
JL		 1043 if (sbi->s_mmp_tsk)
1044 kthread_stop(sbi->s_mmp_tsk);
9060dd2c 1045 brelse(sbi->s_sbh);
ac27a0ec 1046 sb->s_fs_info = NULL;
3197ebdb
TT		 1047 /*
1048 * Now that we are completely done shutting down the
1049 * superblock, we need to actually destroy the kobject.
1050 */
3197ebdb
TT		 1051 kobject_put(&sbi->s_kobj);
1052 wait_for_completion(&sbi->s_kobj_unregister);
0441984a
DW		 1053 if (sbi->s_chksum_driver)
1054 crypto_free_shash(sbi->s_chksum_driver);
705895b6 1055 kfree(sbi->s_blockgroup_lock);
5e405595 1056 fs_put_dax(sbi->s_daxdev);
ac27a0ec 1057 kfree(sbi);
ac27a0ec
DK		 1058}
1059
e18b890b 1060static struct kmem_cache *ext4_inode_cachep;
ac27a0ec
DK		 1061
1062/*
1063 * Called inside transaction, so use GFP_NOFS
1064 */
617ba13b 1065static struct inode *ext4_alloc_inode(struct super_block *sb)
ac27a0ec 1066{
617ba13b 1067 struct ext4_inode_info *ei;
ac27a0ec 1068
e6b4f8da 1069 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
ac27a0ec
DK		 1070 if (!ei)
1071 return NULL;
0b8e58a1 1072
ee73f9a5 1073 inode_set_iversion(&ei->vfs_inode, 1);
202ee5df 1074 spin_lock_init(&ei->i_raw_lock);
c9de560d
AT		 1075 INIT_LIST_HEAD(&ei->i_prealloc_list);
1076 spin_lock_init(&ei->i_prealloc_lock);
9a26b661
ZL		 1077 ext4_es_init_tree(&ei->i_es_tree);
1078 rwlock_init(&ei->i_es_lock);
edaa53ca 1079 INIT_LIST_HEAD(&ei->i_es_list);
eb68d0e2 1080 ei->i_es_all_nr = 0;
edaa53ca 1081 ei->i_es_shk_nr = 0;
dd475925 1082 ei->i_es_shrink_lblk = 0;
d2a17637 1083 ei->i_reserved_data_blocks = 0;
9d0be502 1084 ei->i_da_metadata_calc_len = 0;
7e731bc9 1085 ei->i_da_metadata_calc_last_lblock = 0;
d2a17637 1086 spin_lock_init(&(ei->i_block_reservation_lock));
1dc0aa46 1087 ext4_init_pending_tree(&ei->i_pending_tree);
a9e7f447
DM		 1088#ifdef CONFIG_QUOTA
1089 ei->i_reserved_quota = 0;
96c7e0d9 1090 memset(&ei->i_dquot, 0, sizeof(ei->i_dquot));
a9e7f447 1091#endif
8aefcd55 1092 ei->jinode = NULL;
2e8fa54e 1093 INIT_LIST_HEAD(&ei->i_rsv_conversion_list);
744692dc 1094 spin_lock_init(&ei->i_completed_io_lock);
b436b9be
JK		 1095 ei->i_sync_tid = 0;
1096 ei->i_datasync_tid = 0;
e27f41e1 1097 atomic_set(&ei->i_unwritten, 0);
2e8fa54e 1098 INIT_WORK(&ei->i_rsv_conversion_work, ext4_end_io_rsv_work);
ac27a0ec
DK		 1099 return &ei->vfs_inode;
1100}
1101
7ff9c073
TT		 1102static int ext4_drop_inode(struct inode *inode)
1103{
1104 int drop = generic_drop_inode(inode);
1105
1106 trace_ext4_drop_inode(inode, drop);
1107 return drop;
1108}
1109
fa0d7e3d
NP		 1110static void ext4_i_callback(struct rcu_head *head)
1111{
1112 struct inode *inode = container_of(head, struct inode, i_rcu);
fa0d7e3d
NP		 1113 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
1114}
1115
617ba13b 1116static void ext4_destroy_inode(struct inode *inode)
ac27a0ec 1117{
9f7dd93d 1118 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
b31e1552
ES		 1119 ext4_msg(inode->i_sb, KERN_ERR,
1120 "Inode %lu (%p): orphan list check failed!",
1121 inode->i_ino, EXT4_I(inode));
9f7dd93d
VA		 1122 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
1123 EXT4_I(inode), sizeof(struct ext4_inode_info),
1124 true);
1125 dump_stack();
1126 }
fa0d7e3d 1127 call_rcu(&inode->i_rcu, ext4_i_callback);
ac27a0ec
DK		 1128}
1129
51cc5068 1130static void init_once(void *foo)
ac27a0ec 1131{
617ba13b 1132 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
ac27a0ec 1133
a35afb83 1134 INIT_LIST_HEAD(&ei->i_orphan);
a35afb83 1135 init_rwsem(&ei->xattr_sem);
0e855ac8 1136 init_rwsem(&ei->i_data_sem);
ea3d7209 1137 init_rwsem(&ei->i_mmap_sem);
a35afb83 1138 inode_init_once(&ei->vfs_inode);
ac27a0ec
DK		 1139}
1140
e67bc2b3 1141static int __init init_inodecache(void)
ac27a0ec 1142{
f8dd7c70
DW		 1143 ext4_inode_cachep = kmem_cache_create_usercopy("ext4_inode_cache",
1144 sizeof(struct ext4_inode_info), 0,
1145 (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|
1146 SLAB_ACCOUNT),
1147 offsetof(struct ext4_inode_info, i_data),
1148 sizeof_field(struct ext4_inode_info, i_data),
1149 init_once);
617ba13b 1150 if (ext4_inode_cachep == NULL)
ac27a0ec
DK		 1151 return -ENOMEM;
1152 return 0;
1153}
1154
1155static void destroy_inodecache(void)
1156{
8c0a8537
KS		 1157 /*
1158 * Make sure all delayed rcu free inodes are flushed before we
1159 * destroy cache.
1160 */
1161 rcu_barrier();
617ba13b 1162 kmem_cache_destroy(ext4_inode_cachep);
ac27a0ec
DK		 1163}
1164
0930fcc1 1165void ext4_clear_inode(struct inode *inode)
ac27a0ec 1166{
0930fcc1 1167 invalidate_inode_buffers(inode);
dbd5768f 1168 clear_inode(inode);
9f754758 1169 dquot_drop(inode);
c2ea3fde 1170 ext4_discard_preallocations(inode);
51865fda 1171 ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS);
8aefcd55
TT		 1172 if (EXT4_I(inode)->jinode) {
1173 jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode),
1174 EXT4_I(inode)->jinode);
1175 jbd2_free_inode(EXT4_I(inode)->jinode);
1176 EXT4_I(inode)->jinode = NULL;
1177 }
3d204e24 1178 fscrypt_put_encryption_info(inode);
ac27a0ec
DK		 1179}
1180
1b961ac0 1181static struct inode *ext4_nfs_get_inode(struct super_block *sb,
0b8e58a1 1182 u64 ino, u32 generation)
ac27a0ec 1183{
ac27a0ec 1184 struct inode *inode;
ac27a0ec 1185
8a363970 1186 /*
ac27a0ec
DK		 1187 * Currently we don't know the generation for parent directory, so
1188 * a generation of 0 means "accept any"
1189 */
8a363970 1190 inode = ext4_iget(sb, ino, EXT4_IGET_HANDLE);
1d1fe1ee
DH		 1191 if (IS_ERR(inode))
1192 return ERR_CAST(inode);
1193 if (generation && inode->i_generation != generation) {
ac27a0ec
DK		 1194 iput(inode);
1195 return ERR_PTR(-ESTALE);
1196 }
1b961ac0
CH		 1197
1198 return inode;
1199}
1200
1201static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
0b8e58a1 1202 int fh_len, int fh_type)
1b961ac0
CH		 1203{
1204 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
1205 ext4_nfs_get_inode);
1206}
1207
1208static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
0b8e58a1 1209 int fh_len, int fh_type)
1b961ac0
CH		 1210{
1211 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
1212 ext4_nfs_get_inode);
ac27a0ec
DK		 1213}
1214
fde87268
TT		 1215static int ext4_nfs_commit_metadata(struct inode *inode)
1216{
1217 struct writeback_control wbc = {
1218 .sync_mode = WB_SYNC_ALL
1219 };
1220
1221 trace_ext4_nfs_commit_metadata(inode);
1222 return ext4_write_inode(inode, &wbc);
1223}
1224
c39a7f84
TO		 1225/*
1226 * Try to release metadata pages (indirect blocks, directories) which are
1227 * mapped via the block device. Since these pages could have journal heads
1228 * which would prevent try_to_free_buffers() from freeing them, we must use
1229 * jbd2 layer's try_to_free_buffers() function to release them.
1230 */
0b8e58a1
AD		 1231static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
1232 gfp_t wait)
c39a7f84
TO		 1233{
1234 journal_t *journal = EXT4_SB(sb)->s_journal;
1235
1236 WARN_ON(PageChecked(page));
1237 if (!page_has_buffers(page))
1238 return 0;
1239 if (journal)
1240 return jbd2_journal_try_to_free_buffers(journal, page,
d0164adc 1241 wait & ~__GFP_DIRECT_RECLAIM);
c39a7f84
TO		 1242 return try_to_free_buffers(page);
1243}
1244
643fa961 1245#ifdef CONFIG_FS_ENCRYPTION
a7550b30
JK		 1246static int ext4_get_context(struct inode *inode, void *ctx, size_t len)
1247{
1248 return ext4_xattr_get(inode, EXT4_XATTR_INDEX_ENCRYPTION,
1249 EXT4_XATTR_NAME_ENCRYPTION_CONTEXT, ctx, len);
1250}
1251
a7550b30
JK		 1252static int ext4_set_context(struct inode *inode, const void *ctx, size_t len,
1253 void *fs_data)
1254{
2f8f5e76 1255 handle_t *handle = fs_data;
c1a5d5f6 1256 int res, res2, credits, retries = 0;
2f8f5e76 1257
9ce0151a
EB		 1258 /*
1259 * Encrypting the root directory is not allowed because e2fsck expects
1260 * lost+found to exist and be unencrypted, and encrypting the root
1261 * directory would imply encrypting the lost+found directory as well as
1262 * the filename "lost+found" itself.
1263 */
1264 if (inode->i_ino == EXT4_ROOT_INO)
1265 return -EPERM;
2f8f5e76 1266
7d3e06a8
RZ		 1267 if (WARN_ON_ONCE(IS_DAX(inode) && i_size_read(inode)))
1268 return -EINVAL;
1269
94840e3c
EB		 1270 res = ext4_convert_inline_data(inode);
1271 if (res)
1272 return res;
1273
2f8f5e76
EB		 1274 /*
1275 * If a journal handle was specified, then the encryption context is
1276 * being set on a new inode via inheritance and is part of a larger
1277 * transaction to create the inode. Otherwise the encryption context is
1278 * being set on an existing inode in its own transaction. Only in the
1279 * latter case should the "retry on ENOSPC" logic be used.
1280 */
a7550b30 1281
2f8f5e76
EB		 1282 if (handle) {
1283 res = ext4_xattr_set_handle(handle, inode,
1284 EXT4_XATTR_INDEX_ENCRYPTION,
1285 EXT4_XATTR_NAME_ENCRYPTION_CONTEXT,
1286 ctx, len, 0);
a7550b30
JK		 1287 if (!res) {
1288 ext4_set_inode_flag(inode, EXT4_INODE_ENCRYPT);
1289 ext4_clear_inode_state(inode,
1290 EXT4_STATE_MAY_INLINE_DATA);
a3caa24b 1291 /*
2ee6a576
EB		 1292 * Update inode->i_flags - S_ENCRYPTED will be enabled,
1293 * S_DAX may be disabled
a3caa24b
JK		 1294 */
1295 ext4_set_inode_flags(inode);
a7550b30
JK		 1296 }
1297 return res;
1298 }
1299
b8cb5a54
TE		 1300 res = dquot_initialize(inode);
1301 if (res)
1302 return res;
2f8f5e76 1303retry:
af65207c
TE		 1304 res = ext4_xattr_set_credits(inode, len, false /* is_create */,
1305 &credits);
dec214d0
TE		 1306 if (res)
1307 return res;
1308
c1a5d5f6 1309 handle = ext4_journal_start(inode, EXT4_HT_MISC, credits);
a7550b30
JK		 1310 if (IS_ERR(handle))
1311 return PTR_ERR(handle);
1312
2f8f5e76
EB		 1313 res = ext4_xattr_set_handle(handle, inode, EXT4_XATTR_INDEX_ENCRYPTION,
1314 EXT4_XATTR_NAME_ENCRYPTION_CONTEXT,
1315 ctx, len, 0);
a7550b30
JK		 1316 if (!res) {
1317 ext4_set_inode_flag(inode, EXT4_INODE_ENCRYPT);
2ee6a576
EB		 1318 /*
1319 * Update inode->i_flags - S_ENCRYPTED will be enabled,
1320 * S_DAX may be disabled
1321 */
a3caa24b 1322 ext4_set_inode_flags(inode);
a7550b30
JK		 1323 res = ext4_mark_inode_dirty(handle, inode);
1324 if (res)
1325 EXT4_ERROR_INODE(inode, "Failed to mark inode dirty");
1326 }
1327 res2 = ext4_journal_stop(handle);
2f8f5e76
EB		 1328
1329 if (res == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
1330 goto retry;
a7550b30
JK		 1331 if (!res)
1332 res = res2;
1333 return res;
1334}
1335
c250b7dd 1336static bool ext4_dummy_context(struct inode *inode)
a7550b30
JK		 1337{
1338 return DUMMY_ENCRYPTION_ENABLED(EXT4_SB(inode->i_sb));
1339}
1340
6f69f0ed 1341static const struct fscrypt_operations ext4_cryptops = {
a5d431ef 1342 .key_prefix = "ext4:",
a7550b30 1343 .get_context = ext4_get_context,
a7550b30
JK		 1344 .set_context = ext4_set_context,
1345 .dummy_context = ext4_dummy_context,
a7550b30 1346 .empty_dir = ext4_empty_dir,
e12ee683 1347 .max_namelen = EXT4_NAME_LEN,
a7550b30 1348};
a7550b30
JK		 1349#endif
1350
ac27a0ec 1351#ifdef CONFIG_QUOTA
d6006186 1352static const char * const quotatypes[] = INITQFNAMES;
689c958c 1353#define QTYPE2NAME(t) (quotatypes[t])
ac27a0ec 1354
617ba13b
MC		 1355static int ext4_write_dquot(struct dquot *dquot);
1356static int ext4_acquire_dquot(struct dquot *dquot);
1357static int ext4_release_dquot(struct dquot *dquot);
1358static int ext4_mark_dquot_dirty(struct dquot *dquot);
1359static int ext4_write_info(struct super_block *sb, int type);
6f28e087 1360static int ext4_quota_on(struct super_block *sb, int type, int format_id,
8c54ca9c 1361 const struct path *path);
617ba13b
MC		 1362static int ext4_quota_on_mount(struct super_block *sb, int type);
1363static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec 1364 size_t len, loff_t off);
617ba13b 1365static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec 1366 const char *data, size_t len, loff_t off);
7c319d32
AK		 1367static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
1368 unsigned int flags);
1369static int ext4_enable_quotas(struct super_block *sb);
8f0e8746 1370static int ext4_get_next_id(struct super_block *sb, struct kqid *qid);
ac27a0ec 1371
96c7e0d9
JK		 1372static struct dquot **ext4_get_dquots(struct inode *inode)
1373{
1374 return EXT4_I(inode)->i_dquot;
1375}
1376
61e225dc 1377static const struct dquot_operations ext4_quota_operations = {
7a9ca53a
TE		 1378 .get_reserved_space = ext4_get_reserved_space,
1379 .write_dquot = ext4_write_dquot,
1380 .acquire_dquot = ext4_acquire_dquot,
1381 .release_dquot = ext4_release_dquot,
1382 .mark_dirty = ext4_mark_dquot_dirty,
1383 .write_info = ext4_write_info,
1384 .alloc_dquot = dquot_alloc,
1385 .destroy_dquot = dquot_destroy,
1386 .get_projid = ext4_get_projid,
1387 .get_inode_usage = ext4_get_inode_usage,
1388 .get_next_id = ext4_get_next_id,
ac27a0ec
DK		 1389};
1390
0d54b217 1391static const struct quotactl_ops ext4_qctl_operations = {
617ba13b 1392 .quota_on = ext4_quota_on,
ca0e05e4 1393 .quota_off = ext4_quota_off,
287a8095 1394 .quota_sync = dquot_quota_sync,
0a240339 1395 .get_state = dquot_get_state,
287a8095
CH		 1396 .set_info = dquot_set_dqinfo,
1397 .get_dqblk = dquot_get_dqblk,
6332b9b5
ES		 1398 .set_dqblk = dquot_set_dqblk,
1399 .get_nextdqblk = dquot_get_next_dqblk,
ac27a0ec
DK		 1400};
1401#endif
1402
ee9b6d61 1403static const struct super_operations ext4_sops = {
617ba13b
MC		 1404 .alloc_inode = ext4_alloc_inode,
1405 .destroy_inode = ext4_destroy_inode,
617ba13b
MC		 1406 .write_inode = ext4_write_inode,
1407 .dirty_inode = ext4_dirty_inode,
7ff9c073 1408 .drop_inode = ext4_drop_inode,
0930fcc1 1409 .evict_inode = ext4_evict_inode,
617ba13b 1410 .put_super = ext4_put_super,
617ba13b 1411 .sync_fs = ext4_sync_fs,
c4be0c1d
TS		 1412 .freeze_fs = ext4_freeze,
1413 .unfreeze_fs = ext4_unfreeze,
617ba13b
MC		 1414 .statfs = ext4_statfs,
1415 .remount_fs = ext4_remount,
617ba13b 1416 .show_options = ext4_show_options,
ac27a0ec 1417#ifdef CONFIG_QUOTA
617ba13b
MC		 1418 .quota_read = ext4_quota_read,
1419 .quota_write = ext4_quota_write,
96c7e0d9 1420 .get_dquots = ext4_get_dquots,
ac27a0ec 1421#endif
c39a7f84 1422 .bdev_try_to_free_page = bdev_try_to_free_page,
ac27a0ec
DK		 1423};
1424
39655164 1425static const struct export_operations ext4_export_ops = {
1b961ac0
CH		 1426 .fh_to_dentry = ext4_fh_to_dentry,
1427 .fh_to_parent = ext4_fh_to_parent,
617ba13b 1428 .get_parent = ext4_get_parent,
fde87268 1429 .commit_metadata = ext4_nfs_commit_metadata,
ac27a0ec
DK		 1430};
1431
1432enum {
1433 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
1434 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
72578c33 1435 Opt_nouid32, Opt_debug, Opt_removed,
ac27a0ec 1436 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
72578c33 1437 Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload,
ad4eec61
ES		 1438 Opt_commit, Opt_min_batch_time, Opt_max_batch_time, Opt_journal_dev,
1439 Opt_journal_path, Opt_journal_checksum, Opt_journal_async_commit,
ac27a0ec 1440 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
6ddb2447 1441 Opt_data_err_abort, Opt_data_err_ignore, Opt_test_dummy_encryption,
ac27a0ec 1442 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
5a20bdfc 1443 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
ee4a3fcd 1444 Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err,
49da9392 1445 Opt_usrquota, Opt_grpquota, Opt_prjquota, Opt_i_version, Opt_dax,
327eaf73
TT		 1446 Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_warn_on_error,
1447 Opt_nowarn_on_error, Opt_mblk_io_submit,
670e9875 1448 Opt_lazytime, Opt_nolazytime, Opt_debug_want_extra_isize,
1449032b 1449 Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity,
5328e635 1450 Opt_inode_readahead_blks, Opt_journal_ioprio,
744692dc 1451 Opt_dioread_nolock, Opt_dioread_lock,
fc6cb1cd 1452 Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable,
cdb7ee4c 1453 Opt_max_dir_size_kb, Opt_nojournal_checksum, Opt_nombcache,
ac27a0ec
DK		 1454};
1455
a447c093 1456static const match_table_t tokens = {
ac27a0ec
DK		 1457 {Opt_bsd_df, "bsddf"},
1458 {Opt_minix_df, "minixdf"},
1459 {Opt_grpid, "grpid"},
1460 {Opt_grpid, "bsdgroups"},
1461 {Opt_nogrpid, "nogrpid"},
1462 {Opt_nogrpid, "sysvgroups"},
1463 {Opt_resgid, "resgid=%u"},
1464 {Opt_resuid, "resuid=%u"},
1465 {Opt_sb, "sb=%u"},
1466 {Opt_err_cont, "errors=continue"},
1467 {Opt_err_panic, "errors=panic"},
1468 {Opt_err_ro, "errors=remount-ro"},
1469 {Opt_nouid32, "nouid32"},
ac27a0ec 1470 {Opt_debug, "debug"},
72578c33
TT		 1471 {Opt_removed, "oldalloc"},
1472 {Opt_removed, "orlov"},
ac27a0ec
DK		 1473 {Opt_user_xattr, "user_xattr"},
1474 {Opt_nouser_xattr, "nouser_xattr"},
1475 {Opt_acl, "acl"},
1476 {Opt_noacl, "noacl"},
e3bb52ae 1477 {Opt_noload, "norecovery"},
5a916be1 1478 {Opt_noload, "noload"},
72578c33
TT		 1479 {Opt_removed, "nobh"},
1480 {Opt_removed, "bh"},
ac27a0ec 1481 {Opt_commit, "commit=%u"},
30773840
TT		 1482 {Opt_min_batch_time, "min_batch_time=%u"},
1483 {Opt_max_batch_time, "max_batch_time=%u"},
ac27a0ec 1484 {Opt_journal_dev, "journal_dev=%u"},
ad4eec61 1485 {Opt_journal_path, "journal_path=%s"},
818d276c 1486 {Opt_journal_checksum, "journal_checksum"},
c6d3d56d 1487 {Opt_nojournal_checksum, "nojournal_checksum"},
818d276c 1488 {Opt_journal_async_commit, "journal_async_commit"},
ac27a0ec
DK		 1489 {Opt_abort, "abort"},
1490 {Opt_data_journal, "data=journal"},
1491 {Opt_data_ordered, "data=ordered"},
1492 {Opt_data_writeback, "data=writeback"},
5bf5683a
HK		 1493 {Opt_data_err_abort, "data_err=abort"},
1494 {Opt_data_err_ignore, "data_err=ignore"},
ac27a0ec
DK		 1495 {Opt_offusrjquota, "usrjquota="},
1496 {Opt_usrjquota, "usrjquota=%s"},
1497 {Opt_offgrpjquota, "grpjquota="},
1498 {Opt_grpjquota, "grpjquota=%s"},
1499 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
1500 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
5a20bdfc 1501 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
ac27a0ec
DK		 1502 {Opt_grpquota, "grpquota"},
1503 {Opt_noquota, "noquota"},
1504 {Opt_quota, "quota"},
1505 {Opt_usrquota, "usrquota"},
49da9392 1506 {Opt_prjquota, "prjquota"},
ac27a0ec 1507 {Opt_barrier, "barrier=%u"},
06705bff
TT		 1508 {Opt_barrier, "barrier"},
1509 {Opt_nobarrier, "nobarrier"},
25ec56b5 1510 {Opt_i_version, "i_version"},
923ae0ff 1511 {Opt_dax, "dax"},
c9de560d 1512 {Opt_stripe, "stripe=%u"},
64769240 1513 {Opt_delalloc, "delalloc"},
327eaf73
TT		 1514 {Opt_warn_on_error, "warn_on_error"},
1515 {Opt_nowarn_on_error, "nowarn_on_error"},
a26f4992
TT		 1516 {Opt_lazytime, "lazytime"},
1517 {Opt_nolazytime, "nolazytime"},
670e9875 1518 {Opt_debug_want_extra_isize, "debug_want_extra_isize=%u"},
dd919b98 1519 {Opt_nodelalloc, "nodelalloc"},
36ade451
JK		 1520 {Opt_removed, "mblk_io_submit"},
1521 {Opt_removed, "nomblk_io_submit"},
6fd058f7
TT		 1522 {Opt_block_validity, "block_validity"},
1523 {Opt_noblock_validity, "noblock_validity"},
240799cd 1524 {Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
b3881f74 1525 {Opt_journal_ioprio, "journal_ioprio=%u"},
afd4672d 1526 {Opt_auto_da_alloc, "auto_da_alloc=%u"},
06705bff
TT		 1527 {Opt_auto_da_alloc, "auto_da_alloc"},
1528 {Opt_noauto_da_alloc, "noauto_da_alloc"},
744692dc
JZ		 1529 {Opt_dioread_nolock, "dioread_nolock"},
1530 {Opt_dioread_lock, "dioread_lock"},
5328e635
ES		 1531 {Opt_discard, "discard"},
1532 {Opt_nodiscard, "nodiscard"},
fc6cb1cd
TT		 1533 {Opt_init_itable, "init_itable=%u"},
1534 {Opt_init_itable, "init_itable"},
1535 {Opt_noinit_itable, "noinit_itable"},
df981d03 1536 {Opt_max_dir_size_kb, "max_dir_size_kb=%u"},
6ddb2447 1537 {Opt_test_dummy_encryption, "test_dummy_encryption"},
cdb7ee4c
TE		 1538 {Opt_nombcache, "nombcache"},
1539 {Opt_nombcache, "no_mbcache"}, /* for backward compatibility */
c7198b9c
TT		 1540 {Opt_removed, "check=none"}, /* mount option from ext2/3 */
1541 {Opt_removed, "nocheck"}, /* mount option from ext2/3 */
1542 {Opt_removed, "reservation"}, /* mount option from ext2/3 */
1543 {Opt_removed, "noreservation"}, /* mount option from ext2/3 */
1544 {Opt_removed, "journal=%u"}, /* mount option from ext2/3 */
f3f12faa 1545 {Opt_err, NULL},
ac27a0ec
DK		 1546};
1547
617ba13b 1548static ext4_fsblk_t get_sb_block(void **data)
ac27a0ec 1549{
617ba13b 1550 ext4_fsblk_t sb_block;
ac27a0ec
DK		 1551 char *options = (char *) *data;
1552
1553 if (!options || strncmp(options, "sb=", 3) != 0)
1554 return 1; /* Default location */
0b8e58a1 1555
ac27a0ec 1556 options += 3;
0b8e58a1 1557 /* TODO: use simple_strtoll with >32bit ext4 */
ac27a0ec
DK		 1558 sb_block = simple_strtoul(options, &options, 0);
1559 if (*options && *options != ',') {
4776004f 1560 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
ac27a0ec
DK		 1561 (char *) *data);
1562 return 1;
1563 }
1564 if (*options == ',')
1565 options++;
1566 *data = (void *) options;
0b8e58a1 1567
ac27a0ec
DK		 1568 return sb_block;
1569}
1570
b3881f74 1571#define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
d6006186
EB		 1572static const char deprecated_msg[] =
1573 "Mount option \"%s\" will be removed by %s\n"
437ca0fd 1574 "Contact [email protected] if you think we should keep it.\n";
b3881f74 1575
56c50f11
DM		 1576#ifdef CONFIG_QUOTA
1577static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
1578{
1579 struct ext4_sb_info *sbi = EXT4_SB(sb);
33458eab 1580 char *qname, *old_qname = get_qf_name(sb, sbi, qtype);
03dafb5f 1581 int ret = -1;
56c50f11 1582
33458eab 1583 if (sb_any_quota_loaded(sb) && !old_qname) {
56c50f11
DM		 1584 ext4_msg(sb, KERN_ERR,
1585 "Cannot change journaled "
1586 "quota options when quota turned on");
57f73c2c 1587 return -1;
56c50f11 1588 }
e2b911c5 1589 if (ext4_has_feature_quota(sb)) {
c325a67c
TT		 1590 ext4_msg(sb, KERN_INFO, "Journaled quota options "
1591 "ignored when QUOTA feature is enabled");
1592 return 1;
262b4662 1593 }
56c50f11
DM		 1594 qname = match_strdup(args);
1595 if (!qname) {
1596 ext4_msg(sb, KERN_ERR,
1597 "Not enough memory for storing quotafile name");
57f73c2c 1598 return -1;
56c50f11 1599 }
33458eab
TT		 1600 if (old_qname) {
1601 if (strcmp(old_qname, qname) == 0)
03dafb5f
CG		 1602 ret = 1;
1603 else
1604 ext4_msg(sb, KERN_ERR,
1605 "%s quota file already specified",
1606 QTYPE2NAME(qtype));
1607 goto errout;
56c50f11 1608 }
03dafb5f 1609 if (strchr(qname, '/')) {
56c50f11
DM		 1610 ext4_msg(sb, KERN_ERR,
1611 "quotafile must be on filesystem root");
03dafb5f 1612 goto errout;
56c50f11 1613 }
33458eab 1614 rcu_assign_pointer(sbi->s_qf_names[qtype], qname);
fd8c37ec 1615 set_opt(sb, QUOTA);
56c50f11 1616 return 1;
03dafb5f
CG		 1617errout:
1618 kfree(qname);
1619 return ret;
56c50f11
DM		 1620}
1621
1622static int clear_qf_name(struct super_block *sb, int qtype)
1623{
1624
1625 struct ext4_sb_info *sbi = EXT4_SB(sb);
33458eab 1626 char *old_qname = get_qf_name(sb, sbi, qtype);
56c50f11 1627
33458eab 1628 if (sb_any_quota_loaded(sb) && old_qname) {
56c50f11
DM		 1629 ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options"
1630 " when quota turned on");
57f73c2c 1631 return -1;
56c50f11 1632 }
33458eab
TT		 1633 rcu_assign_pointer(sbi->s_qf_names[qtype], NULL);
1634 synchronize_rcu();
1635 kfree(old_qname);
56c50f11
DM		 1636 return 1;
1637}
1638#endif
1639
26092bf5
TT		 1640#define MOPT_SET 0x0001
1641#define MOPT_CLEAR 0x0002
1642#define MOPT_NOSUPPORT 0x0004
1643#define MOPT_EXPLICIT 0x0008
1644#define MOPT_CLEAR_ERR 0x0010
1645#define MOPT_GTE0 0x0020
ac27a0ec 1646#ifdef CONFIG_QUOTA
26092bf5
TT		 1647#define MOPT_Q 0
1648#define MOPT_QFMT 0x0040
1649#else
1650#define MOPT_Q MOPT_NOSUPPORT
1651#define MOPT_QFMT MOPT_NOSUPPORT
ac27a0ec 1652#endif
26092bf5 1653#define MOPT_DATAJ 0x0080
8dc0aa8c
TT		 1654#define MOPT_NO_EXT2 0x0100
1655#define MOPT_NO_EXT3 0x0200
1656#define MOPT_EXT4_ONLY (MOPT_NO_EXT2 | MOPT_NO_EXT3)
ad4eec61 1657#define MOPT_STRING 0x0400
26092bf5
TT		 1658
1659static const struct mount_opts {
1660 int token;
1661 int mount_opt;
1662 int flags;
1663} ext4_mount_opts[] = {
1664 {Opt_minix_df, EXT4_MOUNT_MINIX_DF, MOPT_SET},
1665 {Opt_bsd_df, EXT4_MOUNT_MINIX_DF, MOPT_CLEAR},
1666 {Opt_grpid, EXT4_MOUNT_GRPID, MOPT_SET},
1667 {Opt_nogrpid, EXT4_MOUNT_GRPID, MOPT_CLEAR},
26092bf5
TT		 1668 {Opt_block_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_SET},
1669 {Opt_noblock_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_CLEAR},
8dc0aa8c
TT		 1670 {Opt_dioread_nolock, EXT4_MOUNT_DIOREAD_NOLOCK,
1671 MOPT_EXT4_ONLY | MOPT_SET},
1672 {Opt_dioread_lock, EXT4_MOUNT_DIOREAD_NOLOCK,
1673 MOPT_EXT4_ONLY | MOPT_CLEAR},
26092bf5
TT		 1674 {Opt_discard, EXT4_MOUNT_DISCARD, MOPT_SET},
1675 {Opt_nodiscard, EXT4_MOUNT_DISCARD, MOPT_CLEAR},
8dc0aa8c
TT		 1676 {Opt_delalloc, EXT4_MOUNT_DELALLOC,
1677 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
1678 {Opt_nodelalloc, EXT4_MOUNT_DELALLOC,
59d9fa5c 1679 MOPT_EXT4_ONLY | MOPT_CLEAR},
327eaf73
TT		 1680 {Opt_warn_on_error, EXT4_MOUNT_WARN_ON_ERROR, MOPT_SET},
1681 {Opt_nowarn_on_error, EXT4_MOUNT_WARN_ON_ERROR, MOPT_CLEAR},
c6d3d56d
DW		 1682 {Opt_nojournal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
1683 MOPT_EXT4_ONLY | MOPT_CLEAR},
8dc0aa8c 1684 {Opt_journal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
1e381f60 1685 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
26092bf5 1686 {Opt_journal_async_commit, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT |
8dc0aa8c 1687 EXT4_MOUNT_JOURNAL_CHECKSUM),
1e381f60 1688 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
8dc0aa8c 1689 {Opt_noload, EXT4_MOUNT_NOLOAD, MOPT_NO_EXT2 | MOPT_SET},
26092bf5
TT		 1690 {Opt_err_panic, EXT4_MOUNT_ERRORS_PANIC, MOPT_SET | MOPT_CLEAR_ERR},
1691 {Opt_err_ro, EXT4_MOUNT_ERRORS_RO, MOPT_SET | MOPT_CLEAR_ERR},
1692 {Opt_err_cont, EXT4_MOUNT_ERRORS_CONT, MOPT_SET | MOPT_CLEAR_ERR},
8dc0aa8c 1693 {Opt_data_err_abort, EXT4_MOUNT_DATA_ERR_ABORT,
7915a861 1694 MOPT_NO_EXT2},
8dc0aa8c 1695 {Opt_data_err_ignore, EXT4_MOUNT_DATA_ERR_ABORT,
7915a861 1696 MOPT_NO_EXT2},
26092bf5
TT		 1697 {Opt_barrier, EXT4_MOUNT_BARRIER, MOPT_SET},
1698 {Opt_nobarrier, EXT4_MOUNT_BARRIER, MOPT_CLEAR},
1699 {Opt_noauto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_SET},
1700 {Opt_auto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_CLEAR},
1701 {Opt_noinit_itable, EXT4_MOUNT_INIT_INODE_TABLE, MOPT_CLEAR},
1702 {Opt_commit, 0, MOPT_GTE0},
1703 {Opt_max_batch_time, 0, MOPT_GTE0},
1704 {Opt_min_batch_time, 0, MOPT_GTE0},
1705 {Opt_inode_readahead_blks, 0, MOPT_GTE0},
1706 {Opt_init_itable, 0, MOPT_GTE0},
923ae0ff 1707 {Opt_dax, EXT4_MOUNT_DAX, MOPT_SET},
26092bf5 1708 {Opt_stripe, 0, MOPT_GTE0},
0efb3b23
JK		 1709 {Opt_resuid, 0, MOPT_GTE0},
1710 {Opt_resgid, 0, MOPT_GTE0},
5ba92bcf
CM		 1711 {Opt_journal_dev, 0, MOPT_NO_EXT2 | MOPT_GTE0},
1712 {Opt_journal_path, 0, MOPT_NO_EXT2 | MOPT_STRING},
1713 {Opt_journal_ioprio, 0, MOPT_NO_EXT2 | MOPT_GTE0},
8dc0aa8c
TT		 1714 {Opt_data_journal, EXT4_MOUNT_JOURNAL_DATA, MOPT_NO_EXT2 | MOPT_DATAJ},
1715 {Opt_data_ordered, EXT4_MOUNT_ORDERED_DATA, MOPT_NO_EXT2 | MOPT_DATAJ},
1716 {Opt_data_writeback, EXT4_MOUNT_WRITEBACK_DATA,
1717 MOPT_NO_EXT2 | MOPT_DATAJ},
26092bf5
TT		 1718 {Opt_user_xattr, EXT4_MOUNT_XATTR_USER, MOPT_SET},
1719 {Opt_nouser_xattr, EXT4_MOUNT_XATTR_USER, MOPT_CLEAR},
03010a33 1720#ifdef CONFIG_EXT4_FS_POSIX_ACL
26092bf5
TT		 1721 {Opt_acl, EXT4_MOUNT_POSIX_ACL, MOPT_SET},
1722 {Opt_noacl, EXT4_MOUNT_POSIX_ACL, MOPT_CLEAR},
ac27a0ec 1723#else
26092bf5
TT		 1724 {Opt_acl, 0, MOPT_NOSUPPORT},
1725 {Opt_noacl, 0, MOPT_NOSUPPORT},
ac27a0ec 1726#endif
26092bf5
TT		 1727 {Opt_nouid32, EXT4_MOUNT_NO_UID32, MOPT_SET},
1728 {Opt_debug, EXT4_MOUNT_DEBUG, MOPT_SET},
670e9875 1729 {Opt_debug_want_extra_isize, 0, MOPT_GTE0},
26092bf5
TT		 1730 {Opt_quota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA, MOPT_SET | MOPT_Q},
1731 {Opt_usrquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA,
1732 MOPT_SET | MOPT_Q},
1733 {Opt_grpquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_GRPQUOTA,
1734 MOPT_SET | MOPT_Q},
49da9392
JK		 1735 {Opt_prjquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_PRJQUOTA,
1736 MOPT_SET | MOPT_Q},
26092bf5 1737 {Opt_noquota, (EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA |
49da9392
JK		 1738 EXT4_MOUNT_GRPQUOTA | EXT4_MOUNT_PRJQUOTA),
1739 MOPT_CLEAR | MOPT_Q},
26092bf5
TT		 1740 {Opt_usrjquota, 0, MOPT_Q},
1741 {Opt_grpjquota, 0, MOPT_Q},
1742 {Opt_offusrjquota, 0, MOPT_Q},
1743 {Opt_offgrpjquota, 0, MOPT_Q},
1744 {Opt_jqfmt_vfsold, QFMT_VFS_OLD, MOPT_QFMT},
1745 {Opt_jqfmt_vfsv0, QFMT_VFS_V0, MOPT_QFMT},
1746 {Opt_jqfmt_vfsv1, QFMT_VFS_V1, MOPT_QFMT},
df981d03 1747 {Opt_max_dir_size_kb, 0, MOPT_GTE0},
6ddb2447 1748 {Opt_test_dummy_encryption, 0, MOPT_GTE0},
cdb7ee4c 1749 {Opt_nombcache, EXT4_MOUNT_NO_MBCACHE, MOPT_SET},
26092bf5
TT		 1750 {Opt_err, 0, 0}
1751};
1752
1753static int handle_mount_opt(struct super_block *sb, char *opt, int token,
1754 substring_t *args, unsigned long *journal_devnum,
1755 unsigned int *journal_ioprio, int is_remount)
1756{
1757 struct ext4_sb_info *sbi = EXT4_SB(sb);
1758 const struct mount_opts *m;
08cefc7a
EB		 1759 kuid_t uid;
1760 kgid_t gid;
26092bf5
TT		 1761 int arg = 0;
1762
57f73c2c
TT		 1763#ifdef CONFIG_QUOTA
1764 if (token == Opt_usrjquota)
1765 return set_qf_name(sb, USRQUOTA, &args[0]);
1766 else if (token == Opt_grpjquota)
1767 return set_qf_name(sb, GRPQUOTA, &args[0]);
1768 else if (token == Opt_offusrjquota)
1769 return clear_qf_name(sb, USRQUOTA);
1770 else if (token == Opt_offgrpjquota)
1771 return clear_qf_name(sb, GRPQUOTA);
1772#endif
26092bf5 1773 switch (token) {
f7048605
TT		 1774 case Opt_noacl:
1775 case Opt_nouser_xattr:
1776 ext4_msg(sb, KERN_WARNING, deprecated_msg, opt, "3.5");
1777 break;
26092bf5
TT		 1778 case Opt_sb:
1779 return 1; /* handled by get_sb_block() */
1780 case Opt_removed:
5f3633e3 1781 ext4_msg(sb, KERN_WARNING, "Ignoring removed %s option", opt);
26092bf5 1782 return 1;
26092bf5
TT		 1783 case Opt_abort:
1784 sbi->s_mount_flags |= EXT4_MF_FS_ABORTED;
1785 return 1;
1786 case Opt_i_version:
357fdad0 1787 sb->s_flags |= SB_I_VERSION;
26092bf5 1788 return 1;
a26f4992 1789 case Opt_lazytime:
1751e8a6 1790 sb->s_flags |= SB_LAZYTIME;
a26f4992
TT		 1791 return 1;
1792 case Opt_nolazytime:
1751e8a6 1793 sb->s_flags &= ~SB_LAZYTIME;
a26f4992 1794 return 1;
26092bf5
TT		 1795 }
1796
5f3633e3
JK		 1797 for (m = ext4_mount_opts; m->token != Opt_err; m++)
1798 if (token == m->token)
1799 break;
1800
1801 if (m->token == Opt_err) {
1802 ext4_msg(sb, KERN_ERR, "Unrecognized mount option \"%s\" "
1803 "or missing value", opt);
1804 return -1;
1805 }
1806
8dc0aa8c
TT		 1807 if ((m->flags & MOPT_NO_EXT2) && IS_EXT2_SB(sb)) {
1808 ext4_msg(sb, KERN_ERR,
1809 "Mount option \"%s\" incompatible with ext2", opt);
1810 return -1;
1811 }
1812 if ((m->flags & MOPT_NO_EXT3) && IS_EXT3_SB(sb)) {
1813 ext4_msg(sb, KERN_ERR,
1814 "Mount option \"%s\" incompatible with ext3", opt);
1815 return -1;
1816 }
1817
ad4eec61 1818 if (args->from && !(m->flags & MOPT_STRING) && match_int(args, &arg))
5f3633e3
JK		 1819 return -1;
1820 if (args->from && (m->flags & MOPT_GTE0) && (arg < 0))
1821 return -1;
c93cf2d7
DM		 1822 if (m->flags & MOPT_EXPLICIT) {
1823 if (m->mount_opt & EXT4_MOUNT_DELALLOC) {
1824 set_opt2(sb, EXPLICIT_DELALLOC);
1e381f60
DM		 1825 } else if (m->mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) {
1826 set_opt2(sb, EXPLICIT_JOURNAL_CHECKSUM);
c93cf2d7
DM		 1827 } else
1828 return -1;
1829 }
5f3633e3
JK		 1830 if (m->flags & MOPT_CLEAR_ERR)
1831 clear_opt(sb, ERRORS_MASK);
1832 if (token == Opt_noquota && sb_any_quota_loaded(sb)) {
1833 ext4_msg(sb, KERN_ERR, "Cannot change quota "
1834 "options when quota turned on");
1835 return -1;
1836 }
1837
1838 if (m->flags & MOPT_NOSUPPORT) {
1839 ext4_msg(sb, KERN_ERR, "%s option not supported", opt);
1840 } else if (token == Opt_commit) {
1841 if (arg == 0)
1842 arg = JBD2_DEFAULT_MAX_COMMIT_AGE;
1843 sbi->s_commit_interval = HZ * arg;
670e9875
TT		 1844 } else if (token == Opt_debug_want_extra_isize) {
1845 sbi->s_want_extra_isize = arg;
5f3633e3 1846 } else if (token == Opt_max_batch_time) {
5f3633e3
JK		 1847 sbi->s_max_batch_time = arg;
1848 } else if (token == Opt_min_batch_time) {
1849 sbi->s_min_batch_time = arg;
1850 } else if (token == Opt_inode_readahead_blks) {
e33e60ea
JK		 1851 if (arg && (arg > (1 << 30) || !is_power_of_2(arg))) {
1852 ext4_msg(sb, KERN_ERR,
1853 "EXT4-fs: inode_readahead_blks must be "
1854 "0 or a power of 2 smaller than 2^31");
26092bf5 1855 return -1;
5f3633e3
JK		 1856 }
1857 sbi->s_inode_readahead_blks = arg;
1858 } else if (token == Opt_init_itable) {
1859 set_opt(sb, INIT_INODE_TABLE);
1860 if (!args->from)
1861 arg = EXT4_DEF_LI_WAIT_MULT;
1862 sbi->s_li_wait_mult = arg;
1863 } else if (token == Opt_max_dir_size_kb) {
1864 sbi->s_max_dir_size_kb = arg;
1865 } else if (token == Opt_stripe) {
1866 sbi->s_stripe = arg;
1867 } else if (token == Opt_resuid) {
1868 uid = make_kuid(current_user_ns(), arg);
1869 if (!uid_valid(uid)) {
1870 ext4_msg(sb, KERN_ERR, "Invalid uid value %d", arg);
26092bf5
TT		 1871 return -1;
1872 }
5f3633e3
JK		 1873 sbi->s_resuid = uid;
1874 } else if (token == Opt_resgid) {
1875 gid = make_kgid(current_user_ns(), arg);
1876 if (!gid_valid(gid)) {
1877 ext4_msg(sb, KERN_ERR, "Invalid gid value %d", arg);
1878 return -1;
1879 }
1880 sbi->s_resgid = gid;
1881 } else if (token == Opt_journal_dev) {
1882 if (is_remount) {
1883 ext4_msg(sb, KERN_ERR,
1884 "Cannot specify journal on remount");
1885 return -1;
1886 }
1887 *journal_devnum = arg;
ad4eec61
ES		 1888 } else if (token == Opt_journal_path) {
1889 char *journal_path;
1890 struct inode *journal_inode;
1891 struct path path;
1892 int error;
1893
1894 if (is_remount) {
1895 ext4_msg(sb, KERN_ERR,
1896 "Cannot specify journal on remount");
1897 return -1;
1898 }
1899 journal_path = match_strdup(&args[0]);
1900 if (!journal_path) {
1901 ext4_msg(sb, KERN_ERR, "error: could not dup "
1902 "journal device string");
1903 return -1;
1904 }
1905
1906 error = kern_path(journal_path, LOOKUP_FOLLOW, &path);
1907 if (error) {
1908 ext4_msg(sb, KERN_ERR, "error: could not find "
1909 "journal device path: error %d", error);
1910 kfree(journal_path);
1911 return -1;
1912 }
1913
2b0143b5 1914 journal_inode = d_inode(path.dentry);
ad4eec61
ES		 1915 if (!S_ISBLK(journal_inode->i_mode)) {
1916 ext4_msg(sb, KERN_ERR, "error: journal path %s "
1917 "is not a block device", journal_path);
1918 path_put(&path);
1919 kfree(journal_path);
1920 return -1;
1921 }
1922
1923 *journal_devnum = new_encode_dev(journal_inode->i_rdev);
1924 path_put(&path);
1925 kfree(journal_path);
5f3633e3
JK		 1926 } else if (token == Opt_journal_ioprio) {
1927 if (arg > 7) {
1928 ext4_msg(sb, KERN_ERR, "Invalid journal IO priority"
1929 " (must be 0-7)");
1930 return -1;
1931 }
1932 *journal_ioprio =
1933 IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, arg);
6ddb2447 1934 } else if (token == Opt_test_dummy_encryption) {
643fa961 1935#ifdef CONFIG_FS_ENCRYPTION
6ddb2447
TT		 1936 sbi->s_mount_flags |= EXT4_MF_TEST_DUMMY_ENCRYPTION;
1937 ext4_msg(sb, KERN_WARNING,
1938 "Test dummy encryption mode enabled");
1939#else
1940 ext4_msg(sb, KERN_WARNING,
1941 "Test dummy encryption mount option ignored");
1942#endif
5f3633e3
JK		 1943 } else if (m->flags & MOPT_DATAJ) {
1944 if (is_remount) {
1945 if (!sbi->s_journal)
1946 ext4_msg(sb, KERN_WARNING, "Remounting file system with no journal so ignoring journalled data option");
1947 else if (test_opt(sb, DATA_FLAGS) != m->mount_opt) {
0efb3b23 1948 ext4_msg(sb, KERN_ERR,
26092bf5 1949 "Cannot change data mode on remount");
26092bf5 1950 return -1;
ac27a0ec 1951 }
26092bf5 1952 } else {
5f3633e3
JK		 1953 clear_opt(sb, DATA_FLAGS);
1954 sbi->s_mount_opt |= m->mount_opt;
ac27a0ec 1955 }
5f3633e3
JK		 1956#ifdef CONFIG_QUOTA
1957 } else if (m->flags & MOPT_QFMT) {
1958 if (sb_any_quota_loaded(sb) &&
1959 sbi->s_jquota_fmt != m->mount_opt) {
1960 ext4_msg(sb, KERN_ERR, "Cannot change journaled "
1961 "quota options when quota turned on");
1962 return -1;
1963 }
e2b911c5 1964 if (ext4_has_feature_quota(sb)) {
c325a67c
TT		 1965 ext4_msg(sb, KERN_INFO,
1966 "Quota format mount options ignored "
262b4662 1967 "when QUOTA feature is enabled");
c325a67c 1968 return 1;
262b4662 1969 }
5f3633e3 1970 sbi->s_jquota_fmt = m->mount_opt;
923ae0ff 1971#endif
923ae0ff 1972 } else if (token == Opt_dax) {
ef83b6e8
DW		 1973#ifdef CONFIG_FS_DAX
1974 ext4_msg(sb, KERN_WARNING,
1975 "DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
a92abd73 1976 sbi->s_mount_opt |= m->mount_opt;
ef83b6e8 1977#else
923ae0ff
RZ		 1978 ext4_msg(sb, KERN_INFO, "dax option not supported");
1979 return -1;
5f3633e3 1980#endif
7915a861
AN		 1981 } else if (token == Opt_data_err_abort) {
1982 sbi->s_mount_opt |= m->mount_opt;
1983 } else if (token == Opt_data_err_ignore) {
1984 sbi->s_mount_opt &= ~m->mount_opt;
5f3633e3
JK		 1985 } else {
1986 if (!args->from)
1987 arg = 1;
1988 if (m->flags & MOPT_CLEAR)
1989 arg = !arg;
1990 else if (unlikely(!(m->flags & MOPT_SET))) {
1991 ext4_msg(sb, KERN_WARNING,
1992 "buggy handling of option %s", opt);
1993 WARN_ON(1);
1994 return -1;
1995 }
1996 if (arg != 0)
1997 sbi->s_mount_opt |= m->mount_opt;
1998 else
1999 sbi->s_mount_opt &= ~m->mount_opt;
26092bf5 2000 }
5f3633e3 2001 return 1;
26092bf5
TT		 2002}
2003
2004static int parse_options(char *options, struct super_block *sb,
2005 unsigned long *journal_devnum,
2006 unsigned int *journal_ioprio,
2007 int is_remount)
2008{
2009 struct ext4_sb_info *sbi = EXT4_SB(sb);
33458eab 2010 char *p, __maybe_unused *usr_qf_name, __maybe_unused *grp_qf_name;
26092bf5
TT		 2011 substring_t args[MAX_OPT_ARGS];
2012 int token;
2013
2014 if (!options)
2015 return 1;
2016
2017 while ((p = strsep(&options, ",")) != NULL) {
2018 if (!*p)
2019 continue;
2020 /*
2021 * Initialize args struct so we know whether arg was
2022 * found; some options take optional arguments.
2023 */
caecd0af 2024 args[0].to = args[0].from = NULL;
26092bf5
TT		 2025 token = match_token(p, tokens, args);
2026 if (handle_mount_opt(sb, p, token, args, journal_devnum,
2027 journal_ioprio, is_remount) < 0)
2028 return 0;
ac27a0ec
DK		 2029 }
2030#ifdef CONFIG_QUOTA
49da9392
JK		 2031 /*
2032 * We do the test below only for project quotas. 'usrquota' and
2033 * 'grpquota' mount options are allowed even without quota feature
2034 * to support legacy quotas in quota files.
2035 */
2036 if (test_opt(sb, PRJQUOTA) && !ext4_has_feature_project(sb)) {
2037 ext4_msg(sb, KERN_ERR, "Project quota feature not enabled. "
2038 "Cannot enable project quota enforcement.");
2039 return 0;
2040 }
33458eab
TT		 2041 usr_qf_name = get_qf_name(sb, sbi, USRQUOTA);
2042 grp_qf_name = get_qf_name(sb, sbi, GRPQUOTA);
2043 if (usr_qf_name || grp_qf_name) {
2044 if (test_opt(sb, USRQUOTA) && usr_qf_name)
fd8c37ec 2045 clear_opt(sb, USRQUOTA);
ac27a0ec 2046
33458eab 2047 if (test_opt(sb, GRPQUOTA) && grp_qf_name)
fd8c37ec 2048 clear_opt(sb, GRPQUOTA);
ac27a0ec 2049
56c50f11 2050 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
b31e1552
ES		 2051 ext4_msg(sb, KERN_ERR, "old and new quota "
2052 "format mixing");
ac27a0ec
DK		 2053 return 0;
2054 }
2055
2056 if (!sbi->s_jquota_fmt) {
b31e1552
ES		 2057 ext4_msg(sb, KERN_ERR, "journaled quota format "
2058 "not specified");
ac27a0ec
DK		 2059 return 0;
2060 }
ac27a0ec
DK		 2061 }
2062#endif
261cb20c
JK		 2063 if (test_opt(sb, DIOREAD_NOLOCK)) {
2064 int blocksize =
2065 BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);
2066
09cbfeaf 2067 if (blocksize < PAGE_SIZE) {
261cb20c
JK		 2068 ext4_msg(sb, KERN_ERR, "can't mount with "
2069 "dioread_nolock if block size != PAGE_SIZE");
2070 return 0;
2071 }
2072 }
ac27a0ec
DK		 2073 return 1;
2074}
2075
2adf6da8
TT		 2076static inline void ext4_show_quota_options(struct seq_file *seq,
2077 struct super_block *sb)
2078{
2079#if defined(CONFIG_QUOTA)
2080 struct ext4_sb_info *sbi = EXT4_SB(sb);
33458eab 2081 char *usr_qf_name, *grp_qf_name;
2adf6da8
TT		 2082
2083 if (sbi->s_jquota_fmt) {
2084 char *fmtname = "";
2085
2086 switch (sbi->s_jquota_fmt) {
2087 case QFMT_VFS_OLD:
2088 fmtname = "vfsold";
2089 break;
2090 case QFMT_VFS_V0:
2091 fmtname = "vfsv0";
2092 break;
2093 case QFMT_VFS_V1:
2094 fmtname = "vfsv1";
2095 break;
2096 }
2097 seq_printf(seq, ",jqfmt=%s", fmtname);
2098 }
2099
33458eab
TT		 2100 rcu_read_lock();
2101 usr_qf_name = rcu_dereference(sbi->s_qf_names[USRQUOTA]);
2102 grp_qf_name = rcu_dereference(sbi->s_qf_names[GRPQUOTA]);
2103 if (usr_qf_name)
2104 seq_show_option(seq, "usrjquota", usr_qf_name);
2105 if (grp_qf_name)
2106 seq_show_option(seq, "grpjquota", grp_qf_name);
2107 rcu_read_unlock();
2adf6da8
TT		 2108#endif
2109}
2110
5a916be1
TT		 2111static const char *token2str(int token)
2112{
50df9fd5 2113 const struct match_token *t;
5a916be1
TT		 2114
2115 for (t = tokens; t->token != Opt_err; t++)
2116 if (t->token == token && !strchr(t->pattern, '='))
2117 break;
2118 return t->pattern;
2119}
2120
2adf6da8
TT		 2121/*
2122 * Show an option if
2123 * - it's set to a non-default value OR
2124 * - if the per-sb default is different from the global default
2125 */
66acdcf4
TT		 2126static int _ext4_show_options(struct seq_file *seq, struct super_block *sb,
2127 int nodefs)
2adf6da8 2128{
2adf6da8
TT		 2129 struct ext4_sb_info *sbi = EXT4_SB(sb);
2130 struct ext4_super_block *es = sbi->s_es;
68afa7e0 2131 int def_errors, def_mount_opt = sbi->s_def_mount_opt;
5a916be1 2132 const struct mount_opts *m;
66acdcf4 2133 char sep = nodefs ? '\n' : ',';
2adf6da8 2134
66acdcf4
TT		 2135#define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep)
2136#define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg)
2adf6da8
TT		 2137
2138 if (sbi->s_sb_block != 1)
5a916be1
TT		 2139 SEQ_OPTS_PRINT("sb=%llu", sbi->s_sb_block);
2140
2141 for (m = ext4_mount_opts; m->token != Opt_err; m++) {
2142 int want_set = m->flags & MOPT_SET;
2143 if (((m->flags & (MOPT_SET|MOPT_CLEAR)) == 0) ||
2144 (m->flags & MOPT_CLEAR_ERR))
2145 continue;
68afa7e0 2146 if (!nodefs && !(m->mount_opt & (sbi->s_mount_opt ^ def_mount_opt)))
5a916be1
TT		 2147 continue; /* skip if same as the default */
2148 if ((want_set &&
2149 (sbi->s_mount_opt & m->mount_opt) != m->mount_opt) ||
2150 (!want_set && (sbi->s_mount_opt & m->mount_opt)))
2151 continue; /* select Opt_noFoo vs Opt_Foo */
2152 SEQ_OPTS_PRINT("%s", token2str(m->token));
2adf6da8 2153 }
5a916be1 2154
08cefc7a 2155 if (nodefs || !uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT4_DEF_RESUID)) ||
5a916be1 2156 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID)
08cefc7a
EB		 2157 SEQ_OPTS_PRINT("resuid=%u",
2158 from_kuid_munged(&init_user_ns, sbi->s_resuid));
2159 if (nodefs || !gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT4_DEF_RESGID)) ||
5a916be1 2160 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID)
08cefc7a
EB		 2161 SEQ_OPTS_PRINT("resgid=%u",
2162 from_kgid_munged(&init_user_ns, sbi->s_resgid));
66acdcf4 2163 def_errors = nodefs ? -1 : le16_to_cpu(es->s_errors);
5a916be1
TT		 2164 if (test_opt(sb, ERRORS_RO) && def_errors != EXT4_ERRORS_RO)
2165 SEQ_OPTS_PUTS("errors=remount-ro");
2adf6da8 2166 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
5a916be1 2167 SEQ_OPTS_PUTS("errors=continue");
2adf6da8 2168 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
5a916be1 2169 SEQ_OPTS_PUTS("errors=panic");
66acdcf4 2170 if (nodefs || sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ)
5a916be1 2171 SEQ_OPTS_PRINT("commit=%lu", sbi->s_commit_interval / HZ);
66acdcf4 2172 if (nodefs || sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME)
5a916be1 2173 SEQ_OPTS_PRINT("min_batch_time=%u", sbi->s_min_batch_time);
66acdcf4 2174 if (nodefs || sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME)
5a916be1 2175 SEQ_OPTS_PRINT("max_batch_time=%u", sbi->s_max_batch_time);
357fdad0 2176 if (sb->s_flags & SB_I_VERSION)
5a916be1 2177 SEQ_OPTS_PUTS("i_version");
66acdcf4 2178 if (nodefs || sbi->s_stripe)
5a916be1 2179 SEQ_OPTS_PRINT("stripe=%lu", sbi->s_stripe);
68afa7e0
TN		 2180 if (nodefs || EXT4_MOUNT_DATA_FLAGS &
2181 (sbi->s_mount_opt ^ def_mount_opt)) {
5a916be1
TT		 2182 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
2183 SEQ_OPTS_PUTS("data=journal");
2184 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
2185 SEQ_OPTS_PUTS("data=ordered");
2186 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
2187 SEQ_OPTS_PUTS("data=writeback");
2188 }
66acdcf4
TT		 2189 if (nodefs ||
2190 sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
5a916be1
TT		 2191 SEQ_OPTS_PRINT("inode_readahead_blks=%u",
2192 sbi->s_inode_readahead_blks);
2adf6da8 2193
ceec0376 2194 if (test_opt(sb, INIT_INODE_TABLE) && (nodefs ||
66acdcf4 2195 (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT)))
5a916be1 2196 SEQ_OPTS_PRINT("init_itable=%u", sbi->s_li_wait_mult);
df981d03
TT		 2197 if (nodefs || sbi->s_max_dir_size_kb)
2198 SEQ_OPTS_PRINT("max_dir_size_kb=%u", sbi->s_max_dir_size_kb);
7915a861
AN		 2199 if (test_opt(sb, DATA_ERR_ABORT))
2200 SEQ_OPTS_PUTS("data_err=abort");
338affb5
EB		 2201 if (DUMMY_ENCRYPTION_ENABLED(sbi))
2202 SEQ_OPTS_PUTS("test_dummy_encryption");
2adf6da8
TT		 2203
2204 ext4_show_quota_options(seq, sb);
2adf6da8
TT		 2205 return 0;
2206}
2207
66acdcf4
TT		 2208static int ext4_show_options(struct seq_file *seq, struct dentry *root)
2209{
2210 return _ext4_show_options(seq, root->d_sb, 0);
2211}
2212
ebd173be 2213int ext4_seq_options_show(struct seq_file *seq, void *offset)
66acdcf4
TT		 2214{
2215 struct super_block *sb = seq->private;
2216 int rc;
2217
bc98a42c 2218 seq_puts(seq, sb_rdonly(sb) ? "ro" : "rw");
66acdcf4
TT		 2219 rc = _ext4_show_options(seq, sb, 1);
2220 seq_puts(seq, "\n");
2221 return rc;
2222}
2223
617ba13b 2224static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
ac27a0ec
DK		 2225 int read_only)
2226{
617ba13b 2227 struct ext4_sb_info *sbi = EXT4_SB(sb);
c89128a0 2228 int err = 0;
ac27a0ec 2229
617ba13b 2230 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
b31e1552
ES		 2231 ext4_msg(sb, KERN_ERR, "revision level too high, "
2232 "forcing read-only mode");
c89128a0 2233 err = -EROFS;
ac27a0ec
DK		 2234 }
2235 if (read_only)
281b5995 2236 goto done;
617ba13b 2237 if (!(sbi->s_mount_state & EXT4_VALID_FS))
b31e1552
ES		 2238 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
2239 "running e2fsck is recommended");
c8b459f4 2240 else if (sbi->s_mount_state & EXT4_ERROR_FS)
b31e1552
ES		 2241 ext4_msg(sb, KERN_WARNING,
2242 "warning: mounting fs with errors, "
2243 "running e2fsck is recommended");
ed3ce80a 2244 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
ac27a0ec
DK		 2245 le16_to_cpu(es->s_mnt_count) >=
2246 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
b31e1552
ES		 2247 ext4_msg(sb, KERN_WARNING,
2248 "warning: maximal mount count reached, "
2249 "running e2fsck is recommended");
ac27a0ec 2250 else if (le32_to_cpu(es->s_checkinterval) &&
6a0678a7
AB		 2251 (ext4_get_tstamp(es, s_lastcheck) +
2252 le32_to_cpu(es->s_checkinterval) <= ktime_get_real_seconds()))
b31e1552
ES		 2253 ext4_msg(sb, KERN_WARNING,
2254 "warning: checktime reached, "
2255 "running e2fsck is recommended");
0b8e58a1 2256 if (!sbi->s_journal)
0390131b 2257 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
ac27a0ec 2258 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
617ba13b 2259 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
e8546d06 2260 le16_add_cpu(&es->s_mnt_count, 1);
6a0678a7 2261 ext4_update_tstamp(es, s_mtime);
0390131b 2262 if (sbi->s_journal)
e2b911c5 2263 ext4_set_feature_journal_needs_recovery(sb);
ac27a0ec 2264
c89128a0 2265 err = ext4_commit_super(sb, 1);
281b5995 2266done:
ac27a0ec 2267 if (test_opt(sb, DEBUG))
a9df9a49 2268 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
a2595b8a 2269 "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
ac27a0ec
DK		 2270 sb->s_blocksize,
2271 sbi->s_groups_count,
617ba13b
MC		 2272 EXT4_BLOCKS_PER_GROUP(sb),
2273 EXT4_INODES_PER_GROUP(sb),
a2595b8a 2274 sbi->s_mount_opt, sbi->s_mount_opt2);
ac27a0ec 2275
7abc52c2 2276 cleancache_init_fs(sb);
c89128a0 2277 return err;
ac27a0ec
DK		 2278}
2279
117fff10
TT		 2280int ext4_alloc_flex_bg_array(struct super_block *sb, ext4_group_t ngroup)
2281{
2282 struct ext4_sb_info *sbi = EXT4_SB(sb);
2283 struct flex_groups *new_groups;
2284 int size;
2285
2286 if (!sbi->s_log_groups_per_flex)
2287 return 0;
2288
2289 size = ext4_flex_group(sbi, ngroup - 1) + 1;
2290 if (size <= sbi->s_flex_groups_allocated)
2291 return 0;
2292
2293 size = roundup_pow_of_two(size * sizeof(struct flex_groups));
a7c3e901 2294 new_groups = kvzalloc(size, GFP_KERNEL);
117fff10
TT		 2295 if (!new_groups) {
2296 ext4_msg(sb, KERN_ERR, "not enough memory for %d flex groups",
2297 size / (int) sizeof(struct flex_groups));
2298 return -ENOMEM;
2299 }
2300
2301 if (sbi->s_flex_groups) {
2302 memcpy(new_groups, sbi->s_flex_groups,
2303 (sbi->s_flex_groups_allocated *
2304 sizeof(struct flex_groups)));
b93b41d4 2305 kvfree(sbi->s_flex_groups);
117fff10
TT		 2306 }
2307 sbi->s_flex_groups = new_groups;
2308 sbi->s_flex_groups_allocated = size / sizeof(struct flex_groups);
2309 return 0;
2310}
2311
772cb7c8
JS		 2312static int ext4_fill_flex_info(struct super_block *sb)
2313{
2314 struct ext4_sb_info *sbi = EXT4_SB(sb);
2315 struct ext4_group_desc *gdp = NULL;
772cb7c8 2316 ext4_group_t flex_group;
117fff10 2317 int i, err;
772cb7c8 2318
503358ae 2319 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
d50f2ab6 2320 if (sbi->s_log_groups_per_flex < 1 || sbi->s_log_groups_per_flex > 31) {
772cb7c8
JS		 2321 sbi->s_log_groups_per_flex = 0;
2322 return 1;
2323 }
2324
117fff10
TT		 2325 err = ext4_alloc_flex_bg_array(sb, sbi->s_groups_count);
2326 if (err)
9933fc0a 2327 goto failed;
772cb7c8 2328
772cb7c8 2329 for (i = 0; i < sbi->s_groups_count; i++) {
88b6edd1 2330 gdp = ext4_get_group_desc(sb, i, NULL);
772cb7c8
JS		 2331
2332 flex_group = ext4_flex_group(sbi, i);
7ad9bb65
TT		 2333 atomic_add(ext4_free_inodes_count(sb, gdp),
2334 &sbi->s_flex_groups[flex_group].free_inodes);
90ba983f
TT		 2335 atomic64_add(ext4_free_group_clusters(sb, gdp),
2336 &sbi->s_flex_groups[flex_group].free_clusters);
7ad9bb65
TT		 2337 atomic_add(ext4_used_dirs_count(sb, gdp),
2338 &sbi->s_flex_groups[flex_group].used_dirs);
772cb7c8
JS		 2339 }
2340
2341 return 1;
2342failed:
2343 return 0;
2344}
2345
e2b911c5 2346static __le16 ext4_group_desc_csum(struct super_block *sb, __u32 block_group,
feb0ab32 2347 struct ext4_group_desc *gdp)
717d50e4 2348{
b47820ed 2349 int offset = offsetof(struct ext4_group_desc, bg_checksum);
717d50e4 2350 __u16 crc = 0;
feb0ab32 2351 __le32 le_group = cpu_to_le32(block_group);
e2b911c5 2352 struct ext4_sb_info *sbi = EXT4_SB(sb);
717d50e4 2353
9aa5d32b 2354 if (ext4_has_metadata_csum(sbi->s_sb)) {
feb0ab32 2355 /* Use new metadata_csum algorithm */
feb0ab32 2356 __u32 csum32;
b47820ed 2357 __u16 dummy_csum = 0;
feb0ab32 2358
feb0ab32
DW		 2359 csum32 = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&le_group,
2360 sizeof(le_group));
b47820ed
DJ		 2361 csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp, offset);
2362 csum32 = ext4_chksum(sbi, csum32, (__u8 *)&dummy_csum,
2363 sizeof(dummy_csum));
2364 offset += sizeof(dummy_csum);
2365 if (offset < sbi->s_desc_size)
2366 csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp + offset,
2367 sbi->s_desc_size - offset);
feb0ab32
DW		 2368
2369 crc = csum32 & 0xFFFF;
2370 goto out;
717d50e4
AD		 2371 }
2372
feb0ab32 2373 /* old crc16 code */
e2b911c5 2374 if (!ext4_has_feature_gdt_csum(sb))
813d32f9
DW		 2375 return 0;
2376
feb0ab32
DW		 2377 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
2378 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
2379 crc = crc16(crc, (__u8 *)gdp, offset);
2380 offset += sizeof(gdp->bg_checksum); /* skip checksum */
2381 /* for checksum of struct ext4_group_desc do the rest...*/
e2b911c5 2382 if (ext4_has_feature_64bit(sb) &&
feb0ab32
DW		 2383 offset < le16_to_cpu(sbi->s_es->s_desc_size))
2384 crc = crc16(crc, (__u8 *)gdp + offset,
2385 le16_to_cpu(sbi->s_es->s_desc_size) -
2386 offset);
2387
2388out:
717d50e4
AD		 2389 return cpu_to_le16(crc);
2390}
2391
feb0ab32 2392int ext4_group_desc_csum_verify(struct super_block *sb, __u32 block_group,
717d50e4
AD		 2393 struct ext4_group_desc *gdp)
2394{
feb0ab32 2395 if (ext4_has_group_desc_csum(sb) &&
e2b911c5 2396 (gdp->bg_checksum != ext4_group_desc_csum(sb, block_group, gdp)))
717d50e4
AD		 2397 return 0;
2398
2399 return 1;
2400}
2401
feb0ab32
DW		 2402void ext4_group_desc_csum_set(struct super_block *sb, __u32 block_group,
2403 struct ext4_group_desc *gdp)
2404{
2405 if (!ext4_has_group_desc_csum(sb))
2406 return;
e2b911c5 2407 gdp->bg_checksum = ext4_group_desc_csum(sb, block_group, gdp);
feb0ab32
DW		 2408}
2409
ac27a0ec 2410/* Called at mount-time, super-block is locked */
bfff6873 2411static int ext4_check_descriptors(struct super_block *sb,
829fa70d 2412 ext4_fsblk_t sb_block,
bfff6873 2413 ext4_group_t *first_not_zeroed)
ac27a0ec 2414{
617ba13b
MC		 2415 struct ext4_sb_info *sbi = EXT4_SB(sb);
2416 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
2417 ext4_fsblk_t last_block;
44de022c 2418 ext4_fsblk_t last_bg_block = sb_block + ext4_bg_num_gdb(sb, 0);
bd81d8ee
LV		 2419 ext4_fsblk_t block_bitmap;
2420 ext4_fsblk_t inode_bitmap;
2421 ext4_fsblk_t inode_table;
ce421581 2422 int flexbg_flag = 0;
bfff6873 2423 ext4_group_t i, grp = sbi->s_groups_count;
ac27a0ec 2424
e2b911c5 2425 if (ext4_has_feature_flex_bg(sb))
ce421581
JS		 2426 flexbg_flag = 1;
2427
af5bc92d 2428 ext4_debug("Checking group descriptors");
ac27a0ec 2429
197cd65a
AM		 2430 for (i = 0; i < sbi->s_groups_count; i++) {
2431 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
2432
ce421581 2433 if (i == sbi->s_groups_count - 1 || flexbg_flag)
bd81d8ee 2434 last_block = ext4_blocks_count(sbi->s_es) - 1;
ac27a0ec
DK		 2435 else
2436 last_block = first_block +
617ba13b 2437 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
ac27a0ec 2438
bfff6873
LC		 2439 if ((grp == sbi->s_groups_count) &&
2440 !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2441 grp = i;
2442
8fadc143 2443 block_bitmap = ext4_block_bitmap(sb, gdp);
829fa70d
TT		 2444 if (block_bitmap == sb_block) {
2445 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2446 "Block bitmap for group %u overlaps "
2447 "superblock", i);
18db4b4e
TT		 2448 if (!sb_rdonly(sb))
2449 return 0;
829fa70d 2450 }
77260807
TT		 2451 if (block_bitmap >= sb_block + 1 &&
2452 block_bitmap <= last_bg_block) {
2453 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2454 "Block bitmap for group %u overlaps "
2455 "block group descriptors", i);
2456 if (!sb_rdonly(sb))
2457 return 0;
2458 }
2b2d6d01 2459 if (block_bitmap < first_block || block_bitmap > last_block) {
b31e1552 2460 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2461 "Block bitmap for group %u not in group "
b31e1552 2462 "(block %llu)!", i, block_bitmap);
ac27a0ec
DK		 2463 return 0;
2464 }
8fadc143 2465 inode_bitmap = ext4_inode_bitmap(sb, gdp);
829fa70d
TT		 2466 if (inode_bitmap == sb_block) {
2467 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2468 "Inode bitmap for group %u overlaps "
2469 "superblock", i);
18db4b4e
TT		 2470 if (!sb_rdonly(sb))
2471 return 0;
829fa70d 2472 }
77260807
TT		 2473 if (inode_bitmap >= sb_block + 1 &&
2474 inode_bitmap <= last_bg_block) {
2475 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2476 "Inode bitmap for group %u overlaps "
2477 "block group descriptors", i);
2478 if (!sb_rdonly(sb))
2479 return 0;
2480 }
2b2d6d01 2481 if (inode_bitmap < first_block || inode_bitmap > last_block) {
b31e1552 2482 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2483 "Inode bitmap for group %u not in group "
b31e1552 2484 "(block %llu)!", i, inode_bitmap);
ac27a0ec
DK		 2485 return 0;
2486 }
8fadc143 2487 inode_table = ext4_inode_table(sb, gdp);
829fa70d
TT		 2488 if (inode_table == sb_block) {
2489 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2490 "Inode table for group %u overlaps "
2491 "superblock", i);
18db4b4e
TT		 2492 if (!sb_rdonly(sb))
2493 return 0;
829fa70d 2494 }
77260807
TT		 2495 if (inode_table >= sb_block + 1 &&
2496 inode_table <= last_bg_block) {
2497 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2498 "Inode table for group %u overlaps "
2499 "block group descriptors", i);
2500 if (!sb_rdonly(sb))
2501 return 0;
2502 }
bd81d8ee 2503 if (inode_table < first_block ||
2b2d6d01 2504 inode_table + sbi->s_itb_per_group - 1 > last_block) {
b31e1552 2505 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2506 "Inode table for group %u not in group "
b31e1552 2507 "(block %llu)!", i, inode_table);
ac27a0ec
DK		 2508 return 0;
2509 }
955ce5f5 2510 ext4_lock_group(sb, i);
feb0ab32 2511 if (!ext4_group_desc_csum_verify(sb, i, gdp)) {
b31e1552
ES		 2512 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2513 "Checksum for group %u failed (%u!=%u)",
e2b911c5 2514 i, le16_to_cpu(ext4_group_desc_csum(sb, i,
b31e1552 2515 gdp)), le16_to_cpu(gdp->bg_checksum));
bc98a42c 2516 if (!sb_rdonly(sb)) {
955ce5f5 2517 ext4_unlock_group(sb, i);
8a266467 2518 return 0;
7ee1ec4c 2519 }
717d50e4 2520 }
955ce5f5 2521 ext4_unlock_group(sb, i);
ce421581
JS		 2522 if (!flexbg_flag)
2523 first_block += EXT4_BLOCKS_PER_GROUP(sb);
ac27a0ec 2524 }
bfff6873
LC		 2525 if (NULL != first_not_zeroed)
2526 *first_not_zeroed = grp;
ac27a0ec
DK		 2527 return 1;
2528}
2529
617ba13b 2530/* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
ac27a0ec
DK		 2531 * the superblock) which were deleted from all directories, but held open by
2532 * a process at the time of a crash. We walk the list and try to delete these
2533 * inodes at recovery time (only with a read-write filesystem).
2534 *
2535 * In order to keep the orphan inode chain consistent during traversal (in
2536 * case of crash during recovery), we link each inode into the superblock
2537 * orphan list_head and handle it the same way as an inode deletion during
2538 * normal operation (which journals the operations for us).
2539 *
2540 * We only do an iget() and an iput() on each inode, which is very safe if we
2541 * accidentally point at an in-use or already deleted inode. The worst that
2542 * can happen in this case is that we get a "bit already cleared" message from
617ba13b 2543 * ext4_free_inode(). The only reason we would point at a wrong inode is if
ac27a0ec
DK		 2544 * e2fsck was run on this filesystem, and it must have already done the orphan
2545 * inode cleanup for us, so we can safely abort without any further action.
2546 */
2b2d6d01
TT		 2547static void ext4_orphan_cleanup(struct super_block *sb,
2548 struct ext4_super_block *es)
ac27a0ec
DK		 2549{
2550 unsigned int s_flags = sb->s_flags;
2c98eb5e 2551 int ret, nr_orphans = 0, nr_truncates = 0;
ac27a0ec 2552#ifdef CONFIG_QUOTA
95f1fda4 2553 int quota_update = 0;
ac27a0ec
DK		 2554 int i;
2555#endif
2556 if (!es->s_last_orphan) {
2557 jbd_debug(4, "no orphan inodes to clean up\n");
2558 return;
2559 }
2560
a8f48a95 2561 if (bdev_read_only(sb->s_bdev)) {
b31e1552
ES		 2562 ext4_msg(sb, KERN_ERR, "write access "
2563 "unavailable, skipping orphan cleanup");
a8f48a95
ES		 2564 return;
2565 }
2566
d39195c3
AG		 2567 /* Check if feature set would not allow a r/w mount */
2568 if (!ext4_feature_set_ok(sb, 0)) {
2569 ext4_msg(sb, KERN_INFO, "Skipping orphan cleanup due to "
2570 "unknown ROCOMPAT features");
2571 return;
2572 }
2573
617ba13b 2574 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
c25f9bc6 2575 /* don't clear list on RO mount w/ errors */
1751e8a6 2576 if (es->s_last_orphan && !(s_flags & SB_RDONLY)) {
84474976 2577 ext4_msg(sb, KERN_INFO, "Errors on filesystem, "
ac27a0ec 2578 "clearing orphan list.\n");
c25f9bc6
ES		 2579 es->s_last_orphan = 0;
2580 }
ac27a0ec
DK		 2581 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2582 return;
2583 }
2584
1751e8a6 2585 if (s_flags & SB_RDONLY) {
b31e1552 2586 ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
1751e8a6 2587 sb->s_flags &= ~SB_RDONLY;
ac27a0ec
DK		 2588 }
2589#ifdef CONFIG_QUOTA
2590 /* Needed for iput() to work correctly and not trash data */
1751e8a6 2591 sb->s_flags |= SB_ACTIVE;
95f1fda4 2592
2593 /*
2594 * Turn on quotas which were not enabled for read-only mounts if
2595 * filesystem has quota feature, so that they are updated correctly.
2596 */
1751e8a6 2597 if (ext4_has_feature_quota(sb) && (s_flags & SB_RDONLY)) {
95f1fda4 2598 int ret = ext4_enable_quotas(sb);
2599
2600 if (!ret)
2601 quota_update = 1;
2602 else
2603 ext4_msg(sb, KERN_ERR,
2604 "Cannot turn on quotas: error %d", ret);
2605 }
2606
2607 /* Turn on journaled quotas used for old sytle */
a2d4a646 2608 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
617ba13b
MC		 2609 if (EXT4_SB(sb)->s_qf_names[i]) {
2610 int ret = ext4_quota_on_mount(sb, i);
95f1fda4 2611
2612 if (!ret)
2613 quota_update = 1;
2614 else
b31e1552
ES		 2615 ext4_msg(sb, KERN_ERR,
2616 "Cannot turn on journaled "
95f1fda4 2617 "quota: type %d: error %d", i, ret);
ac27a0ec
DK		 2618 }
2619 }
2620#endif
2621
2622 while (es->s_last_orphan) {
2623 struct inode *inode;
2624
c65d5c6c
VN		 2625 /*
2626 * We may have encountered an error during cleanup; if
2627 * so, skip the rest.
2628 */
2629 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
2630 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2631 es->s_last_orphan = 0;
2632 break;
2633 }
2634
97bd42b9
JB		 2635 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
2636 if (IS_ERR(inode)) {
ac27a0ec
DK		 2637 es->s_last_orphan = 0;
2638 break;
2639 }
2640
617ba13b 2641 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
871a2931 2642 dquot_initialize(inode);
ac27a0ec 2643 if (inode->i_nlink) {
566370a2
PT		 2644 if (test_opt(sb, DEBUG))
2645 ext4_msg(sb, KERN_DEBUG,
2646 "%s: truncating inode %lu to %lld bytes",
2647 __func__, inode->i_ino, inode->i_size);
e5f8eab8 2648 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
ac27a0ec 2649 inode->i_ino, inode->i_size);
5955102c 2650 inode_lock(inode);
55f252c9 2651 truncate_inode_pages(inode->i_mapping, inode->i_size);
2c98eb5e
TT		 2652 ret = ext4_truncate(inode);
2653 if (ret)
2654 ext4_std_error(inode->i_sb, ret);
5955102c 2655 inode_unlock(inode);
ac27a0ec
DK		 2656 nr_truncates++;
2657 } else {
566370a2
PT		 2658 if (test_opt(sb, DEBUG))
2659 ext4_msg(sb, KERN_DEBUG,
2660 "%s: deleting unreferenced inode %lu",
2661 __func__, inode->i_ino);
ac27a0ec
DK		 2662 jbd_debug(2, "deleting unreferenced inode %lu\n",
2663 inode->i_ino);
2664 nr_orphans++;
2665 }
2666 iput(inode); /* The delete magic happens here! */
2667 }
2668
2b2d6d01 2669#define PLURAL(x) (x), ((x) == 1) ? "" : "s"
ac27a0ec
DK		 2670
2671 if (nr_orphans)
b31e1552
ES		 2672 ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
2673 PLURAL(nr_orphans));
ac27a0ec 2674 if (nr_truncates)
b31e1552
ES		 2675 ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
2676 PLURAL(nr_truncates));
ac27a0ec 2677#ifdef CONFIG_QUOTA
95f1fda4 2678 /* Turn off quotas if they were enabled for orphan cleanup */
2679 if (quota_update) {
2680 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
2681 if (sb_dqopt(sb)->files[i])
2682 dquot_quota_off(sb, i);
2683 }
ac27a0ec
DK		 2684 }
2685#endif
1751e8a6 2686 sb->s_flags = s_flags; /* Restore SB_RDONLY status */
ac27a0ec 2687}
0b8e58a1 2688
cd2291a4
ES		 2689/*
2690 * Maximal extent format file size.
2691 * Resulting logical blkno at s_maxbytes must fit in our on-disk
2692 * extent format containers, within a sector_t, and within i_blocks
2693 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
2694 * so that won't be a limiting factor.
2695 *
f17722f9
LC		 2696 * However there is other limiting factor. We do store extents in the form
2697 * of starting block and length, hence the resulting length of the extent
2698 * covering maximum file size must fit into on-disk format containers as
2699 * well. Given that length is always by 1 unit bigger than max unit (because
2700 * we count 0 as well) we have to lower the s_maxbytes by one fs block.
2701 *
cd2291a4
ES		 2702 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
2703 */
f287a1a5 2704static loff_t ext4_max_size(int blkbits, int has_huge_files)
cd2291a4
ES		 2705{
2706 loff_t res;
2707 loff_t upper_limit = MAX_LFS_FILESIZE;
2708
2709 /* small i_blocks in vfs inode? */
f287a1a5 2710 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
cd2291a4 2711 /*
90c699a9 2712 * CONFIG_LBDAF is not enabled implies the inode
cd2291a4
ES		 2713 * i_block represent total blocks in 512 bytes
2714 * 32 == size of vfs inode i_blocks * 8
2715 */
2716 upper_limit = (1LL << 32) - 1;
2717
2718 /* total blocks in file system block size */
2719 upper_limit >>= (blkbits - 9);
2720 upper_limit <<= blkbits;
2721 }
2722
f17722f9
LC		 2723 /*
2724 * 32-bit extent-start container, ee_block. We lower the maxbytes
2725 * by one fs block, so ee_len can cover the extent of maximum file
2726 * size
2727 */
2728 res = (1LL << 32) - 1;
cd2291a4 2729 res <<= blkbits;
cd2291a4
ES		 2730
2731 /* Sanity check against vm- & vfs- imposed limits */
2732 if (res > upper_limit)
2733 res = upper_limit;
2734
2735 return res;
2736}
ac27a0ec 2737
ac27a0ec 2738/*
cd2291a4 2739 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
0fc1b451
AK		 2740 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2741 * We need to be 1 filesystem block less than the 2^48 sector limit.
ac27a0ec 2742 */
f287a1a5 2743static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
ac27a0ec 2744{
617ba13b 2745 loff_t res = EXT4_NDIR_BLOCKS;
0fc1b451
AK		 2746 int meta_blocks;
2747 loff_t upper_limit;
0b8e58a1
AD		 2748 /* This is calculated to be the largest file size for a dense, block
2749 * mapped file such that the file's total number of 512-byte sectors,
2750 * including data and all indirect blocks, does not exceed (2^48 - 1).
2751 *
2752 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2753 * number of 512-byte sectors of the file.
0fc1b451
AK		 2754 */
2755
f287a1a5 2756 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
0fc1b451 2757 /*
90c699a9 2758 * !has_huge_files or CONFIG_LBDAF not enabled implies that
0b8e58a1
AD		 2759 * the inode i_block field represents total file blocks in
2760 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
0fc1b451
AK		 2761 */
2762 upper_limit = (1LL << 32) - 1;
2763
2764 /* total blocks in file system block size */
2765 upper_limit >>= (bits - 9);
2766
2767 } else {
8180a562
AK		 2768 /*
2769 * We use 48 bit ext4_inode i_blocks
2770 * With EXT4_HUGE_FILE_FL set the i_blocks
2771 * represent total number of blocks in
2772 * file system block size
2773 */
0fc1b451
AK		 2774 upper_limit = (1LL << 48) - 1;
2775
0fc1b451
AK		 2776 }
2777
2778 /* indirect blocks */
2779 meta_blocks = 1;
2780 /* double indirect blocks */
2781 meta_blocks += 1 + (1LL << (bits-2));
2782 /* tripple indirect blocks */
2783 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
2784
2785 upper_limit -= meta_blocks;
2786 upper_limit <<= bits;
ac27a0ec
DK		 2787
2788 res += 1LL << (bits-2);
2789 res += 1LL << (2*(bits-2));
2790 res += 1LL << (3*(bits-2));
2791 res <<= bits;
2792 if (res > upper_limit)
2793 res = upper_limit;
0fc1b451
AK		 2794
2795 if (res > MAX_LFS_FILESIZE)
2796 res = MAX_LFS_FILESIZE;
2797
ac27a0ec
DK		 2798 return res;
2799}
2800
617ba13b 2801static ext4_fsblk_t descriptor_loc(struct super_block *sb,
0b8e58a1 2802 ext4_fsblk_t logical_sb_block, int nr)
ac27a0ec 2803{
617ba13b 2804 struct ext4_sb_info *sbi = EXT4_SB(sb);
fd2d4291 2805 ext4_group_t bg, first_meta_bg;
ac27a0ec
DK		 2806 int has_super = 0;
2807
2808 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
2809
e2b911c5 2810 if (!ext4_has_feature_meta_bg(sb) || nr < first_meta_bg)
70bbb3e0 2811 return logical_sb_block + nr + 1;
ac27a0ec 2812 bg = sbi->s_desc_per_block * nr;
617ba13b 2813 if (ext4_bg_has_super(sb, bg))
ac27a0ec 2814 has_super = 1;
0b8e58a1 2815
bd63f6b0
DW		 2816 /*
2817 * If we have a meta_bg fs with 1k blocks, group 0's GDT is at
2818 * block 2, not 1. If s_first_data_block == 0 (bigalloc is enabled
2819 * on modern mke2fs or blksize > 1k on older mke2fs) then we must
2820 * compensate.
2821 */
2822 if (sb->s_blocksize == 1024 && nr == 0 &&
49598e04 2823 le32_to_cpu(sbi->s_es->s_first_data_block) == 0)
bd63f6b0
DW		 2824 has_super++;
2825
617ba13b 2826 return (has_super + ext4_group_first_block_no(sb, bg));
ac27a0ec
DK		 2827}
2828
c9de560d
AT		 2829/**
2830 * ext4_get_stripe_size: Get the stripe size.
2831 * @sbi: In memory super block info
2832 *
2833 * If we have specified it via mount option, then
2834 * use the mount option value. If the value specified at mount time is
2835 * greater than the blocks per group use the super block value.
2836 * If the super block value is greater than blocks per group return 0.
2837 * Allocator needs it be less than blocks per group.
2838 *
2839 */
2840static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
2841{
2842 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
2843 unsigned long stripe_width =
2844 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
3eb08658 2845 int ret;
c9de560d
AT		 2846
2847 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
3eb08658 2848 ret = sbi->s_stripe;
5469d7c3 2849 else if (stripe_width && stripe_width <= sbi->s_blocks_per_group)
3eb08658 2850 ret = stripe_width;
5469d7c3 2851 else if (stride && stride <= sbi->s_blocks_per_group)
3eb08658
DE		 2852 ret = stride;
2853 else
2854 ret = 0;
c9de560d 2855
3eb08658
DE		 2856 /*
2857 * If the stripe width is 1, this makes no sense and
2858 * we set it to 0 to turn off stripe handling code.
2859 */
2860 if (ret <= 1)
2861 ret = 0;
c9de560d 2862
3eb08658 2863 return ret;
c9de560d 2864}
ac27a0ec 2865
a13fb1a4
ES		 2866/*
2867 * Check whether this filesystem can be mounted based on
2868 * the features present and the RDONLY/RDWR mount requested.
2869 * Returns 1 if this filesystem can be mounted as requested,
2870 * 0 if it cannot be.
2871 */
2872static int ext4_feature_set_ok(struct super_block *sb, int readonly)
2873{
e2b911c5 2874 if (ext4_has_unknown_ext4_incompat_features(sb)) {
a13fb1a4
ES		 2875 ext4_msg(sb, KERN_ERR,
2876 "Couldn't mount because of "
2877 "unsupported optional features (%x)",
2878 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
2879 ~EXT4_FEATURE_INCOMPAT_SUPP));
2880 return 0;
2881 }
2882
2883 if (readonly)
2884 return 1;
2885
e2b911c5 2886 if (ext4_has_feature_readonly(sb)) {
2cb5cc8b 2887 ext4_msg(sb, KERN_INFO, "filesystem is read-only");
1751e8a6 2888 sb->s_flags |= SB_RDONLY;
2cb5cc8b
DW		 2889 return 1;
2890 }
2891
a13fb1a4 2892 /* Check that feature set is OK for a read-write mount */
e2b911c5 2893 if (ext4_has_unknown_ext4_ro_compat_features(sb)) {
a13fb1a4
ES		 2894 ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of "
2895 "unsupported optional features (%x)",
2896 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
2897 ~EXT4_FEATURE_RO_COMPAT_SUPP));
2898 return 0;
2899 }
2900 /*
2901 * Large file size enabled file system can only be mounted
2902 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
2903 */
e2b911c5 2904 if (ext4_has_feature_huge_file(sb)) {
a13fb1a4
ES		 2905 if (sizeof(blkcnt_t) < sizeof(u64)) {
2906 ext4_msg(sb, KERN_ERR, "Filesystem with huge files "
2907 "cannot be mounted RDWR without "
2908 "CONFIG_LBDAF");
2909 return 0;
2910 }
2911 }
e2b911c5 2912 if (ext4_has_feature_bigalloc(sb) && !ext4_has_feature_extents(sb)) {
bab08ab9
TT		 2913 ext4_msg(sb, KERN_ERR,
2914 "Can't support bigalloc feature without "
2915 "extents feature\n");
2916 return 0;
2917 }
7c319d32
AK		 2918
2919#ifndef CONFIG_QUOTA
e2b911c5 2920 if (ext4_has_feature_quota(sb) && !readonly) {
7c319d32
AK		 2921 ext4_msg(sb, KERN_ERR,
2922 "Filesystem with quota feature cannot be mounted RDWR "
2923 "without CONFIG_QUOTA");
2924 return 0;
2925 }
689c958c
LX		 2926 if (ext4_has_feature_project(sb) && !readonly) {
2927 ext4_msg(sb, KERN_ERR,
2928 "Filesystem with project quota feature cannot be mounted RDWR "
2929 "without CONFIG_QUOTA");
2930 return 0;
2931 }
7c319d32 2932#endif /* CONFIG_QUOTA */
a13fb1a4
ES		 2933 return 1;
2934}
2935
66e61a9e
TT		 2936/*
2937 * This function is called once a day if we have errors logged
2938 * on the file system
2939 */
235699a8 2940static void print_daily_error_info(struct timer_list *t)
66e61a9e 2941{
235699a8
KC		 2942 struct ext4_sb_info *sbi = from_timer(sbi, t, s_err_report);
2943 struct super_block *sb = sbi->s_sb;
2944 struct ext4_super_block *es = sbi->s_es;
66e61a9e
TT		 2945
2946 if (es->s_error_count)
ae0f78de
TT		 2947 /* fsck newer than v1.41.13 is needed to clean this condition. */
2948 ext4_msg(sb, KERN_NOTICE, "error count since last fsck: %u",
66e61a9e
TT		 2949 le32_to_cpu(es->s_error_count));
2950 if (es->s_first_error_time) {
6a0678a7
AB		 2951 printk(KERN_NOTICE "EXT4-fs (%s): initial error at time %llu: %.*s:%d",
2952 sb->s_id,
2953 ext4_get_tstamp(es, s_first_error_time),
66e61a9e
TT		 2954 (int) sizeof(es->s_first_error_func),
2955 es->s_first_error_func,
2956 le32_to_cpu(es->s_first_error_line));
2957 if (es->s_first_error_ino)
651e1c3b 2958 printk(KERN_CONT ": inode %u",
66e61a9e
TT		 2959 le32_to_cpu(es->s_first_error_ino));
2960 if (es->s_first_error_block)
651e1c3b 2961 printk(KERN_CONT ": block %llu", (unsigned long long)
66e61a9e 2962 le64_to_cpu(es->s_first_error_block));
651e1c3b 2963 printk(KERN_CONT "\n");
66e61a9e
TT		 2964 }
2965 if (es->s_last_error_time) {
6a0678a7
AB		 2966 printk(KERN_NOTICE "EXT4-fs (%s): last error at time %llu: %.*s:%d",
2967 sb->s_id,
2968 ext4_get_tstamp(es, s_last_error_time),
66e61a9e
TT		 2969 (int) sizeof(es->s_last_error_func),
2970 es->s_last_error_func,
2971 le32_to_cpu(es->s_last_error_line));
2972 if (es->s_last_error_ino)
651e1c3b 2973 printk(KERN_CONT ": inode %u",
66e61a9e
TT		 2974 le32_to_cpu(es->s_last_error_ino));
2975 if (es->s_last_error_block)
651e1c3b 2976 printk(KERN_CONT ": block %llu", (unsigned long long)
66e61a9e 2977 le64_to_cpu(es->s_last_error_block));
651e1c3b 2978 printk(KERN_CONT "\n");
66e61a9e
TT		 2979 }
2980 mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ); /* Once a day */
2981}
2982
bfff6873
LC		 2983/* Find next suitable group and run ext4_init_inode_table */
2984static int ext4_run_li_request(struct ext4_li_request *elr)
2985{
2986 struct ext4_group_desc *gdp = NULL;
2987 ext4_group_t group, ngroups;
2988 struct super_block *sb;
2989 unsigned long timeout = 0;
2990 int ret = 0;
2991
2992 sb = elr->lr_super;
2993 ngroups = EXT4_SB(sb)->s_groups_count;
2994
2995 for (group = elr->lr_next_group; group < ngroups; group++) {
2996 gdp = ext4_get_group_desc(sb, group, NULL);
2997 if (!gdp) {
2998 ret = 1;
2999 break;
3000 }
3001
3002 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
3003 break;
3004 }
3005
7f511862 3006 if (group >= ngroups)
bfff6873
LC		 3007 ret = 1;
3008
3009 if (!ret) {
3010 timeout = jiffies;
3011 ret = ext4_init_inode_table(sb, group,
3012 elr->lr_timeout ? 0 : 1);
3013 if (elr->lr_timeout == 0) {
51ce6511
LC		 3014 timeout = (jiffies - timeout) *
3015 elr->lr_sbi->s_li_wait_mult;
bfff6873
LC		 3016 elr->lr_timeout = timeout;
3017 }
3018 elr->lr_next_sched = jiffies + elr->lr_timeout;
3019 elr->lr_next_group = group + 1;
3020 }
bfff6873
LC		 3021 return ret;
3022}
3023
3024/*
3025 * Remove lr_request from the list_request and free the
4ed5c033 3026 * request structure. Should be called with li_list_mtx held
bfff6873
LC		 3027 */
3028static void ext4_remove_li_request(struct ext4_li_request *elr)
3029{
3030 struct ext4_sb_info *sbi;
3031
3032 if (!elr)
3033 return;
3034
3035 sbi = elr->lr_sbi;
3036
3037 list_del(&elr->lr_request);
3038 sbi->s_li_request = NULL;
3039 kfree(elr);
3040}
3041
3042static void ext4_unregister_li_request(struct super_block *sb)
3043{
1bb933fb
LC		 3044 mutex_lock(&ext4_li_mtx);
3045 if (!ext4_li_info) {
3046 mutex_unlock(&ext4_li_mtx);
bfff6873 3047 return;
1bb933fb 3048 }
bfff6873
LC		 3049
3050 mutex_lock(&ext4_li_info->li_list_mtx);
1bb933fb 3051 ext4_remove_li_request(EXT4_SB(sb)->s_li_request);
bfff6873 3052 mutex_unlock(&ext4_li_info->li_list_mtx);
1bb933fb 3053 mutex_unlock(&ext4_li_mtx);
bfff6873
LC		 3054}
3055
8f1f7453
ES		 3056static struct task_struct *ext4_lazyinit_task;
3057
bfff6873
LC		 3058/*
3059 * This is the function where ext4lazyinit thread lives. It walks
3060 * through the request list searching for next scheduled filesystem.
3061 * When such a fs is found, run the lazy initialization request
3062 * (ext4_rn_li_request) and keep track of the time spend in this
3063 * function. Based on that time we compute next schedule time of
3064 * the request. When walking through the list is complete, compute
3065 * next waking time and put itself into sleep.
3066 */
3067static int ext4_lazyinit_thread(void *arg)
3068{
3069 struct ext4_lazy_init *eli = (struct ext4_lazy_init *)arg;
3070 struct list_head *pos, *n;
3071 struct ext4_li_request *elr;
4ed5c033 3072 unsigned long next_wakeup, cur;
bfff6873
LC		 3073
3074 BUG_ON(NULL == eli);
3075
bfff6873
LC		 3076cont_thread:
3077 while (true) {
3078 next_wakeup = MAX_JIFFY_OFFSET;
3079
3080 mutex_lock(&eli->li_list_mtx);
3081 if (list_empty(&eli->li_request_list)) {
3082 mutex_unlock(&eli->li_list_mtx);
3083 goto exit_thread;
3084 }
bfff6873 3085 list_for_each_safe(pos, n, &eli->li_request_list) {
e22834f0
DM		 3086 int err = 0;
3087 int progress = 0;
bfff6873
LC		 3088 elr = list_entry(pos, struct ext4_li_request,
3089 lr_request);
3090
e22834f0
DM		 3091 if (time_before(jiffies, elr->lr_next_sched)) {
3092 if (time_before(elr->lr_next_sched, next_wakeup))
3093 next_wakeup = elr->lr_next_sched;
3094 continue;
3095 }
3096 if (down_read_trylock(&elr->lr_super->s_umount)) {
3097 if (sb_start_write_trylock(elr->lr_super)) {
3098 progress = 1;
3099 /*
3100 * We hold sb->s_umount, sb can not
3101 * be removed from the list, it is
3102 * now safe to drop li_list_mtx
3103 */
3104 mutex_unlock(&eli->li_list_mtx);
3105 err = ext4_run_li_request(elr);
3106 sb_end_write(elr->lr_super);
3107 mutex_lock(&eli->li_list_mtx);
3108 n = pos->next;
b2c78cd0 3109 }
e22834f0
DM		 3110 up_read((&elr->lr_super->s_umount));
3111 }
3112 /* error, remove the lazy_init job */
3113 if (err) {
3114 ext4_remove_li_request(elr);
3115 continue;
3116 }
3117 if (!progress) {
3118 elr->lr_next_sched = jiffies +
3119 (prandom_u32()
3120 % (EXT4_DEF_LI_MAX_START_DELAY * HZ));
bfff6873 3121 }
bfff6873
LC		 3122 if (time_before(elr->lr_next_sched, next_wakeup))
3123 next_wakeup = elr->lr_next_sched;
3124 }
3125 mutex_unlock(&eli->li_list_mtx);
3126
a0acae0e 3127 try_to_freeze();
bfff6873 3128
4ed5c033
LC		 3129 cur = jiffies;
3130 if ((time_after_eq(cur, next_wakeup)) ||
f4245bd4 3131 (MAX_JIFFY_OFFSET == next_wakeup)) {
bfff6873
LC		 3132 cond_resched();
3133 continue;
3134 }
3135
4ed5c033
LC		 3136 schedule_timeout_interruptible(next_wakeup - cur);
3137
8f1f7453
ES		 3138 if (kthread_should_stop()) {
3139 ext4_clear_request_list();
3140 goto exit_thread;
3141 }
bfff6873
LC		 3142 }
3143
3144exit_thread:
3145 /*
3146 * It looks like the request list is empty, but we need
3147 * to check it under the li_list_mtx lock, to prevent any
3148 * additions into it, and of course we should lock ext4_li_mtx
3149 * to atomically free the list and ext4_li_info, because at
3150 * this point another ext4 filesystem could be registering
3151 * new one.
3152 */
3153 mutex_lock(&ext4_li_mtx);
3154 mutex_lock(&eli->li_list_mtx);
3155 if (!list_empty(&eli->li_request_list)) {
3156 mutex_unlock(&eli->li_list_mtx);
3157 mutex_unlock(&ext4_li_mtx);
3158 goto cont_thread;
3159 }
3160 mutex_unlock(&eli->li_list_mtx);
bfff6873
LC		 3161 kfree(ext4_li_info);
3162 ext4_li_info = NULL;
3163 mutex_unlock(&ext4_li_mtx);
3164
3165 return 0;
3166}
3167
3168static void ext4_clear_request_list(void)
3169{
3170 struct list_head *pos, *n;
3171 struct ext4_li_request *elr;
3172
3173 mutex_lock(&ext4_li_info->li_list_mtx);
bfff6873
LC		 3174 list_for_each_safe(pos, n, &ext4_li_info->li_request_list) {
3175 elr = list_entry(pos, struct ext4_li_request,
3176 lr_request);
3177 ext4_remove_li_request(elr);
3178 }
3179 mutex_unlock(&ext4_li_info->li_list_mtx);
3180}
3181
3182static int ext4_run_lazyinit_thread(void)
3183{
8f1f7453
ES		 3184 ext4_lazyinit_task = kthread_run(ext4_lazyinit_thread,
3185 ext4_li_info, "ext4lazyinit");
3186 if (IS_ERR(ext4_lazyinit_task)) {
3187 int err = PTR_ERR(ext4_lazyinit_task);
bfff6873 3188 ext4_clear_request_list();
bfff6873
LC		 3189 kfree(ext4_li_info);
3190 ext4_li_info = NULL;
92b97816 3191 printk(KERN_CRIT "EXT4-fs: error %d creating inode table "
bfff6873
LC		 3192 "initialization thread\n",
3193 err);
3194 return err;
3195 }
3196 ext4_li_info->li_state |= EXT4_LAZYINIT_RUNNING;
bfff6873
LC		 3197 return 0;
3198}
3199
3200/*
3201 * Check whether it make sense to run itable init. thread or not.
3202 * If there is at least one uninitialized inode table, return
3203 * corresponding group number, else the loop goes through all
3204 * groups and return total number of groups.
3205 */
3206static ext4_group_t ext4_has_uninit_itable(struct super_block *sb)
3207{
3208 ext4_group_t group, ngroups = EXT4_SB(sb)->s_groups_count;
3209 struct ext4_group_desc *gdp = NULL;
3210
8844618d
TT		 3211 if (!ext4_has_group_desc_csum(sb))
3212 return ngroups;
3213
bfff6873
LC		 3214 for (group = 0; group < ngroups; group++) {
3215 gdp = ext4_get_group_desc(sb, group, NULL);
3216 if (!gdp)
3217 continue;
3218
50122847 3219 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
bfff6873
LC		 3220 break;
3221 }
3222
3223 return group;
3224}
3225
3226static int ext4_li_info_new(void)
3227{
3228 struct ext4_lazy_init *eli = NULL;
3229
3230 eli = kzalloc(sizeof(*eli), GFP_KERNEL);
3231 if (!eli)
3232 return -ENOMEM;
3233
bfff6873
LC		 3234 INIT_LIST_HEAD(&eli->li_request_list);
3235 mutex_init(&eli->li_list_mtx);
3236
bfff6873
LC		 3237 eli->li_state |= EXT4_LAZYINIT_QUIT;
3238
3239 ext4_li_info = eli;
3240
3241 return 0;
3242}
3243
3244static struct ext4_li_request *ext4_li_request_new(struct super_block *sb,
3245 ext4_group_t start)
3246{
3247 struct ext4_sb_info *sbi = EXT4_SB(sb);
3248 struct ext4_li_request *elr;
bfff6873
LC		 3249
3250 elr = kzalloc(sizeof(*elr), GFP_KERNEL);
3251 if (!elr)
3252 return NULL;
3253
3254 elr->lr_super = sb;
3255 elr->lr_sbi = sbi;
3256 elr->lr_next_group = start;
3257
3258 /*
3259 * Randomize first schedule time of the request to
3260 * spread the inode table initialization requests
3261 * better.
3262 */
dd1f723b
TT		 3263 elr->lr_next_sched = jiffies + (prandom_u32() %
3264 (EXT4_DEF_LI_MAX_START_DELAY * HZ));
bfff6873
LC		 3265 return elr;
3266}
3267
7f511862
TT		 3268int ext4_register_li_request(struct super_block *sb,
3269 ext4_group_t first_not_zeroed)
bfff6873
LC		 3270{
3271 struct ext4_sb_info *sbi = EXT4_SB(sb);
7f511862 3272 struct ext4_li_request *elr = NULL;
49598e04 3273 ext4_group_t ngroups = sbi->s_groups_count;
6c5a6cb9 3274 int ret = 0;
bfff6873 3275
7f511862 3276 mutex_lock(&ext4_li_mtx);
51ce6511
LC		 3277 if (sbi->s_li_request != NULL) {
3278 /*
3279 * Reset timeout so it can be computed again, because
3280 * s_li_wait_mult might have changed.
3281 */
3282 sbi->s_li_request->lr_timeout = 0;
7f511862 3283 goto out;
51ce6511 3284 }
bfff6873 3285
bc98a42c 3286 if (first_not_zeroed == ngroups || sb_rdonly(sb) ||
55ff3840 3287 !test_opt(sb, INIT_INODE_TABLE))
7f511862 3288 goto out;
bfff6873
LC		 3289
3290 elr = ext4_li_request_new(sb, first_not_zeroed);
7f511862
TT		 3291 if (!elr) {
3292 ret = -ENOMEM;
3293 goto out;
3294 }
bfff6873
LC		 3295
3296 if (NULL == ext4_li_info) {
3297 ret = ext4_li_info_new();
3298 if (ret)
3299 goto out;
3300 }
3301
3302 mutex_lock(&ext4_li_info->li_list_mtx);
3303 list_add(&elr->lr_request, &ext4_li_info->li_request_list);
3304 mutex_unlock(&ext4_li_info->li_list_mtx);
3305
3306 sbi->s_li_request = elr;
46e4690b
TM		 3307 /*
3308 * set elr to NULL here since it has been inserted to
3309 * the request_list and the removal and free of it is
3310 * handled by ext4_clear_request_list from now on.
3311 */
3312 elr = NULL;
bfff6873
LC		 3313
3314 if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) {
3315 ret = ext4_run_lazyinit_thread();
3316 if (ret)
3317 goto out;
3318 }
bfff6873 3319out:
beed5ecb
NK		 3320 mutex_unlock(&ext4_li_mtx);
3321 if (ret)
bfff6873 3322 kfree(elr);
bfff6873
LC		 3323 return ret;
3324}
3325
3326/*
3327 * We do not need to lock anything since this is called on
3328 * module unload.
3329 */
3330static void ext4_destroy_lazyinit_thread(void)
3331{
3332 /*
3333 * If thread exited earlier
3334 * there's nothing to be done.
3335 */
8f1f7453 3336 if (!ext4_li_info || !ext4_lazyinit_task)
bfff6873
LC		 3337 return;
3338
8f1f7453 3339 kthread_stop(ext4_lazyinit_task);
bfff6873
LC		 3340}
3341
25ed6e8a
DW		 3342static int set_journal_csum_feature_set(struct super_block *sb)
3343{
3344 int ret = 1;
3345 int compat, incompat;
3346 struct ext4_sb_info *sbi = EXT4_SB(sb);
3347
9aa5d32b 3348 if (ext4_has_metadata_csum(sb)) {
db9ee220 3349 /* journal checksum v3 */
25ed6e8a 3350 compat = 0;
db9ee220 3351 incompat = JBD2_FEATURE_INCOMPAT_CSUM_V3;
25ed6e8a
DW		 3352 } else {
3353 /* journal checksum v1 */
3354 compat = JBD2_FEATURE_COMPAT_CHECKSUM;
3355 incompat = 0;
3356 }
3357
feb8c6d3
DW		 3358 jbd2_journal_clear_features(sbi->s_journal,
3359 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
3360 JBD2_FEATURE_INCOMPAT_CSUM_V3 |
3361 JBD2_FEATURE_INCOMPAT_CSUM_V2);
25ed6e8a
DW		 3362 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
3363 ret = jbd2_journal_set_features(sbi->s_journal,
3364 compat, 0,
3365 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT |
3366 incompat);
3367 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
3368 ret = jbd2_journal_set_features(sbi->s_journal,
3369 compat, 0,
3370 incompat);
3371 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
3372 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
3373 } else {
feb8c6d3
DW		 3374 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
3375 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
25ed6e8a
DW		 3376 }
3377
3378 return ret;
3379}
3380
952fc18e
TT		 3381/*
3382 * Note: calculating the overhead so we can be compatible with
3383 * historical BSD practice is quite difficult in the face of
3384 * clusters/bigalloc. This is because multiple metadata blocks from
3385 * different block group can end up in the same allocation cluster.
3386 * Calculating the exact overhead in the face of clustered allocation
3387 * requires either O(all block bitmaps) in memory or O(number of block
3388 * groups**2) in time. We will still calculate the superblock for
3389 * older file systems --- and if we come across with a bigalloc file
3390 * system with zero in s_overhead_clusters the estimate will be close to
3391 * correct especially for very large cluster sizes --- but for newer
3392 * file systems, it's better to calculate this figure once at mkfs
3393 * time, and store it in the superblock. If the superblock value is
3394 * present (even for non-bigalloc file systems), we will use it.
3395 */
3396static int count_overhead(struct super_block *sb, ext4_group_t grp,
3397 char *buf)
3398{
3399 struct ext4_sb_info *sbi = EXT4_SB(sb);
3400 struct ext4_group_desc *gdp;
3401 ext4_fsblk_t first_block, last_block, b;
3402 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3403 int s, j, count = 0;
3404
e2b911c5 3405 if (!ext4_has_feature_bigalloc(sb))
0548bbb8
TT		 3406 return (ext4_bg_has_super(sb, grp) + ext4_bg_num_gdb(sb, grp) +
3407 sbi->s_itb_per_group + 2);
3408
952fc18e
TT		 3409 first_block = le32_to_cpu(sbi->s_es->s_first_data_block) +
3410 (grp * EXT4_BLOCKS_PER_GROUP(sb));
3411 last_block = first_block + EXT4_BLOCKS_PER_GROUP(sb) - 1;
3412 for (i = 0; i < ngroups; i++) {
3413 gdp = ext4_get_group_desc(sb, i, NULL);
3414 b = ext4_block_bitmap(sb, gdp);
3415 if (b >= first_block && b <= last_block) {
3416 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3417 count++;
3418 }
3419 b = ext4_inode_bitmap(sb, gdp);
3420 if (b >= first_block && b <= last_block) {
3421 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3422 count++;
3423 }
3424 b = ext4_inode_table(sb, gdp);
3425 if (b >= first_block && b + sbi->s_itb_per_group <= last_block)
3426 for (j = 0; j < sbi->s_itb_per_group; j++, b++) {
3427 int c = EXT4_B2C(sbi, b - first_block);
3428 ext4_set_bit(c, buf);
3429 count++;
3430 }
3431 if (i != grp)
3432 continue;
3433 s = 0;
3434 if (ext4_bg_has_super(sb, grp)) {
3435 ext4_set_bit(s++, buf);
3436 count++;
3437 }
c48ae41b
TT		 3438 j = ext4_bg_num_gdb(sb, grp);
3439 if (s + j > EXT4_BLOCKS_PER_GROUP(sb)) {
3440 ext4_error(sb, "Invalid number of block group "
3441 "descriptor blocks: %d", j);
3442 j = EXT4_BLOCKS_PER_GROUP(sb) - s;
952fc18e 3443 }
c48ae41b
TT		 3444 count += j;
3445 for (; j > 0; j--)
3446 ext4_set_bit(EXT4_B2C(sbi, s++), buf);
952fc18e
TT		 3447 }
3448 if (!count)
3449 return 0;
3450 return EXT4_CLUSTERS_PER_GROUP(sb) -
3451 ext4_count_free(buf, EXT4_CLUSTERS_PER_GROUP(sb) / 8);
3452}
3453
3454/*
3455 * Compute the overhead and stash it in sbi->s_overhead
3456 */
3457int ext4_calculate_overhead(struct super_block *sb)
3458{
3459 struct ext4_sb_info *sbi = EXT4_SB(sb);
3460 struct ext4_super_block *es = sbi->s_es;
3c816ded
EW		 3461 struct inode *j_inode;
3462 unsigned int j_blocks, j_inum = le32_to_cpu(es->s_journal_inum);
952fc18e
TT		 3463 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3464 ext4_fsblk_t overhead = 0;
4fdb5543 3465 char *buf = (char *) get_zeroed_page(GFP_NOFS);
952fc18e 3466
952fc18e
TT		 3467 if (!buf)
3468 return -ENOMEM;
3469
3470 /*
3471 * Compute the overhead (FS structures). This is constant
3472 * for a given filesystem unless the number of block groups
3473 * changes so we cache the previous value until it does.
3474 */
3475
3476 /*
3477 * All of the blocks before first_data_block are overhead
3478 */
3479 overhead = EXT4_B2C(sbi, le32_to_cpu(es->s_first_data_block));
3480
3481 /*
3482 * Add the overhead found in each block group
3483 */
3484 for (i = 0; i < ngroups; i++) {
3485 int blks;
3486
3487 blks = count_overhead(sb, i, buf);
3488 overhead += blks;
3489 if (blks)
3490 memset(buf, 0, PAGE_SIZE);
3491 cond_resched();
3492 }
3c816ded
EW		 3493
3494 /*
3495 * Add the internal journal blocks whether the journal has been
3496 * loaded or not
3497 */
b003b524 3498 if (sbi->s_journal && !sbi->journal_bdev)
810da240 3499 overhead += EXT4_NUM_B2C(sbi, sbi->s_journal->j_maxlen);
3c816ded
EW		 3500 else if (ext4_has_feature_journal(sb) && !sbi->s_journal) {
3501 j_inode = ext4_get_journal_inode(sb, j_inum);
3502 if (j_inode) {
3503 j_blocks = j_inode->i_size >> sb->s_blocksize_bits;
3504 overhead += EXT4_NUM_B2C(sbi, j_blocks);
3505 iput(j_inode);
3506 } else {
3507 ext4_msg(sb, KERN_ERR, "can't get journal size");
3508 }
3509 }
952fc18e
TT		 3510 sbi->s_overhead = overhead;
3511 smp_wmb();
3512 free_page((unsigned long) buf);
3513 return 0;
3514}
3515
7bc04c5c
BR		 3516static void ext4_clamp_want_extra_isize(struct super_block *sb)
3517{
3518 struct ext4_sb_info *sbi = EXT4_SB(sb);
3519 struct ext4_super_block *es = sbi->s_es;
3520
3521 /* determine the minimum size of new large inodes, if present */
3522 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE &&
3523 sbi->s_want_extra_isize == 0) {
3524 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
3525 EXT4_GOOD_OLD_INODE_SIZE;
3526 if (ext4_has_feature_extra_isize(sb)) {
3527 if (sbi->s_want_extra_isize <
3528 le16_to_cpu(es->s_want_extra_isize))
3529 sbi->s_want_extra_isize =
3530 le16_to_cpu(es->s_want_extra_isize);
3531 if (sbi->s_want_extra_isize <
3532 le16_to_cpu(es->s_min_extra_isize))
3533 sbi->s_want_extra_isize =
3534 le16_to_cpu(es->s_min_extra_isize);
3535 }
3536 }
3537 /* Check if enough inode space is available */
3538 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
3539 sbi->s_inode_size) {
3540 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
3541 EXT4_GOOD_OLD_INODE_SIZE;
3542 ext4_msg(sb, KERN_INFO,
3543 "required extra inode space not available");
3544 }
3545}
3546
b5799018 3547static void ext4_set_resv_clusters(struct super_block *sb)
27dd4385
LC		 3548{
3549 ext4_fsblk_t resv_clusters;
b5799018 3550 struct ext4_sb_info *sbi = EXT4_SB(sb);
27dd4385 3551
30fac0f7
JK		 3552 /*
3553 * There's no need to reserve anything when we aren't using extents.
3554 * The space estimates are exact, there are no unwritten extents,
3555 * hole punching doesn't need new metadata... This is needed especially
3556 * to keep ext2/3 backward compatibility.
3557 */
e2b911c5 3558 if (!ext4_has_feature_extents(sb))
b5799018 3559 return;
27dd4385
LC		 3560 /*
3561 * By default we reserve 2% or 4096 clusters, whichever is smaller.
3562 * This should cover the situations where we can not afford to run
3563 * out of space like for example punch hole, or converting
556615dc 3564 * unwritten extents in delalloc path. In most cases such
27dd4385
LC		 3565 * allocation would require 1, or 2 blocks, higher numbers are
3566 * very rare.
3567 */
b5799018
TT		 3568 resv_clusters = (ext4_blocks_count(sbi->s_es) >>
3569 sbi->s_cluster_bits);
27dd4385
LC		 3570
3571 do_div(resv_clusters, 50);
3572 resv_clusters = min_t(ext4_fsblk_t, resv_clusters, 4096);
3573
b5799018 3574 atomic64_set(&sbi->s_resv_clusters, resv_clusters);
27dd4385
LC		 3575}
3576
2b2d6d01 3577static int ext4_fill_super(struct super_block *sb, void *data, int silent)
ac27a0ec 3578{
5e405595 3579 struct dax_device *dax_dev = fs_dax_get_by_bdev(sb->s_bdev);
d4c402d9 3580 char *orig_data = kstrdup(data, GFP_KERNEL);
2b2d6d01 3581 struct buffer_head *bh;
617ba13b 3582 struct ext4_super_block *es = NULL;
5aee0f8a 3583 struct ext4_sb_info *sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
617ba13b
MC		 3584 ext4_fsblk_t block;
3585 ext4_fsblk_t sb_block = get_sb_block(&data);
70bbb3e0 3586 ext4_fsblk_t logical_sb_block;
ac27a0ec 3587 unsigned long offset = 0;
ac27a0ec
DK		 3588 unsigned long journal_devnum = 0;
3589 unsigned long def_mount_opts;
3590 struct inode *root;
0390131b 3591 const char *descr;
dcc7dae3 3592 int ret = -ENOMEM;
281b5995 3593 int blocksize, clustersize;
4ec11028
TT		 3594 unsigned int db_count;
3595 unsigned int i;
281b5995 3596 int needs_recovery, has_huge_files, has_bigalloc;
bd81d8ee 3597 __u64 blocks_count;
07aa2ea1 3598 int err = 0;
b3881f74 3599 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
bfff6873 3600 ext4_group_t first_not_zeroed;
ac27a0ec 3601
5aee0f8a
TT		 3602 if ((data && !orig_data) || !sbi)
3603 goto out_free_base;
705895b6 3604
aed9eb1b 3605 sbi->s_daxdev = dax_dev;
705895b6
PE		 3606 sbi->s_blockgroup_lock =
3607 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
5aee0f8a
TT		 3608 if (!sbi->s_blockgroup_lock)
3609 goto out_free_base;
3610
ac27a0ec 3611 sb->s_fs_info = sbi;
2c0544b2 3612 sbi->s_sb = sb;
240799cd 3613 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
d9c9bef1 3614 sbi->s_sb_block = sb_block;
f613dfcb
TT		 3615 if (sb->s_bdev->bd_part)
3616 sbi->s_sectors_written_start =
dbae2c55 3617 part_stat_read(sb->s_bdev->bd_part, sectors[STAT_WRITE]);
ac27a0ec 3618
9f6200bb 3619 /* Cleanup superblock name */
ec3904dc 3620 strreplace(sb->s_id, '/', '!');
9f6200bb 3621
07aa2ea1 3622 /* -EINVAL is default */
dcc7dae3 3623 ret = -EINVAL;
617ba13b 3624 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
ac27a0ec 3625 if (!blocksize) {
b31e1552 3626 ext4_msg(sb, KERN_ERR, "unable to set blocksize");
ac27a0ec
DK		 3627 goto out_fail;
3628 }
3629
3630 /*
617ba13b 3631 * The ext4 superblock will not be buffer aligned for other than 1kB
ac27a0ec
DK		 3632 * block sizes. We need to calculate the offset from buffer start.
3633 */
617ba13b 3634 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
70bbb3e0
AM		 3635 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3636 offset = do_div(logical_sb_block, blocksize);
ac27a0ec 3637 } else {
70bbb3e0 3638 logical_sb_block = sb_block;
ac27a0ec
DK		 3639 }
3640
a8ac900b 3641 if (!(bh = sb_bread_unmovable(sb, logical_sb_block))) {
b31e1552 3642 ext4_msg(sb, KERN_ERR, "unable to read superblock");
ac27a0ec
DK		 3643 goto out_fail;
3644 }
3645 /*
3646 * Note: s_es must be initialized as soon as possible because
617ba13b 3647 * some ext4 macro-instructions depend on its value
ac27a0ec 3648 */
2716b802 3649 es = (struct ext4_super_block *) (bh->b_data + offset);
ac27a0ec
DK		 3650 sbi->s_es = es;
3651 sb->s_magic = le16_to_cpu(es->s_magic);
617ba13b
MC		 3652 if (sb->s_magic != EXT4_SUPER_MAGIC)
3653 goto cantfind_ext4;
afc32f7e 3654 sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
ac27a0ec 3655
feb0ab32 3656 /* Warn if metadata_csum and gdt_csum are both set. */
e2b911c5
DW		 3657 if (ext4_has_feature_metadata_csum(sb) &&
3658 ext4_has_feature_gdt_csum(sb))
363307e6 3659 ext4_warning(sb, "metadata_csum and uninit_bg are "
feb0ab32
DW		 3660 "redundant flags; please run fsck.");
3661
d25425f8
DW		 3662 /* Check for a known checksum algorithm */
3663 if (!ext4_verify_csum_type(sb, es)) {
3664 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3665 "unknown checksum algorithm.");
3666 silent = 1;
3667 goto cantfind_ext4;
3668 }
3669
0441984a 3670 /* Load the checksum driver */
a45403b5
TT		 3671 sbi->s_chksum_driver = crypto_alloc_shash("crc32c", 0, 0);
3672 if (IS_ERR(sbi->s_chksum_driver)) {
3673 ext4_msg(sb, KERN_ERR, "Cannot load crc32c driver.");
3674 ret = PTR_ERR(sbi->s_chksum_driver);
3675 sbi->s_chksum_driver = NULL;
3676 goto failed_mount;
0441984a
DW		 3677 }
3678
a9c47317
DW		 3679 /* Check superblock checksum */
3680 if (!ext4_superblock_csum_verify(sb, es)) {
3681 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3682 "invalid superblock checksum. Run e2fsck?");
3683 silent = 1;
6a797d27 3684 ret = -EFSBADCRC;
a9c47317
DW		 3685 goto cantfind_ext4;
3686 }
3687
3688 /* Precompute checksum seed for all metadata */
e2b911c5 3689 if (ext4_has_feature_csum_seed(sb))
8c81bd8f 3690 sbi->s_csum_seed = le32_to_cpu(es->s_checksum_seed);
dec214d0 3691 else if (ext4_has_metadata_csum(sb) || ext4_has_feature_ea_inode(sb))
a9c47317
DW		 3692 sbi->s_csum_seed = ext4_chksum(sbi, ~0, es->s_uuid,
3693 sizeof(es->s_uuid));
3694
ac27a0ec
DK		 3695 /* Set defaults before we parse the mount options */
3696 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
fd8c37ec 3697 set_opt(sb, INIT_INODE_TABLE);
617ba13b 3698 if (def_mount_opts & EXT4_DEFM_DEBUG)
fd8c37ec 3699 set_opt(sb, DEBUG);
87f26807 3700 if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
fd8c37ec 3701 set_opt(sb, GRPID);
617ba13b 3702 if (def_mount_opts & EXT4_DEFM_UID16)
fd8c37ec 3703 set_opt(sb, NO_UID32);
ea663336 3704 /* xattr user namespace & acls are now defaulted on */
ea663336 3705 set_opt(sb, XATTR_USER);
03010a33 3706#ifdef CONFIG_EXT4_FS_POSIX_ACL
ea663336 3707 set_opt(sb, POSIX_ACL);
2e7842b8 3708#endif
98c1a759
DW		 3709 /* don't forget to enable journal_csum when metadata_csum is enabled. */
3710 if (ext4_has_metadata_csum(sb))
3711 set_opt(sb, JOURNAL_CHECKSUM);
3712
617ba13b 3713 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
fd8c37ec 3714 set_opt(sb, JOURNAL_DATA);
617ba13b 3715 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
fd8c37ec 3716 set_opt(sb, ORDERED_DATA);
617ba13b 3717 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
fd8c37ec 3718 set_opt(sb, WRITEBACK_DATA);
617ba13b
MC		 3719
3720 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
fd8c37ec 3721 set_opt(sb, ERRORS_PANIC);
bb4f397a 3722 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
fd8c37ec 3723 set_opt(sb, ERRORS_CONT);
bb4f397a 3724 else
fd8c37ec 3725 set_opt(sb, ERRORS_RO);
45f1a9c3
DW		 3726 /* block_validity enabled by default; disable with noblock_validity */
3727 set_opt(sb, BLOCK_VALIDITY);
8b67f04a 3728 if (def_mount_opts & EXT4_DEFM_DISCARD)
fd8c37ec 3729 set_opt(sb, DISCARD);
ac27a0ec 3730
08cefc7a
EB		 3731 sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));
3732 sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid));
30773840
TT		 3733 sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
3734 sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
3735 sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
ac27a0ec 3736
8b67f04a 3737 if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0)
fd8c37ec 3738 set_opt(sb, BARRIER);
ac27a0ec 3739
dd919b98
AK		 3740 /*
3741 * enable delayed allocation by default
3742 * Use -o nodelalloc to turn it off
3743 */
bc0b75f7 3744 if (!IS_EXT3_SB(sb) && !IS_EXT2_SB(sb) &&
8b67f04a 3745 ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0))
fd8c37ec 3746 set_opt(sb, DELALLOC);
dd919b98 3747
51ce6511
LC		 3748 /*
3749 * set default s_li_wait_mult for lazyinit, for the case there is
3750 * no mount option specified.
3751 */
3752 sbi->s_li_wait_mult = EXT4_DEF_LI_WAIT_MULT;
3753
5aee0f8a
TT		 3754 if (sbi->s_es->s_mount_opts[0]) {
3755 char *s_mount_opts = kstrndup(sbi->s_es->s_mount_opts,
3756 sizeof(sbi->s_es->s_mount_opts),
3757 GFP_KERNEL);
3758 if (!s_mount_opts)
3759 goto failed_mount;
3760 if (!parse_options(s_mount_opts, sb, &journal_devnum,
3761 &journal_ioprio, 0)) {
3762 ext4_msg(sb, KERN_WARNING,
3763 "failed to parse options in superblock: %s",
3764 s_mount_opts);
3765 }
3766 kfree(s_mount_opts);
8b67f04a 3767 }
5a916be1 3768 sbi->s_def_mount_opt = sbi->s_mount_opt;
b3881f74 3769 if (!parse_options((char *) data, sb, &journal_devnum,
661aa520 3770 &journal_ioprio, 0))
ac27a0ec
DK		 3771 goto failed_mount;
3772
56889787
TT		 3773 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
3774 printk_once(KERN_WARNING "EXT4-fs: Warning: mounting "
3775 "with data=journal disables delayed "
3776 "allocation and O_DIRECT support!\n");
3777 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
3778 ext4_msg(sb, KERN_ERR, "can't mount with "
3779 "both data=journal and delalloc");
3780 goto failed_mount;
3781 }
3782 if (test_opt(sb, DIOREAD_NOLOCK)) {
3783 ext4_msg(sb, KERN_ERR, "can't mount with "
6ae6514b 3784 "both data=journal and dioread_nolock");
56889787
TT		 3785 goto failed_mount;
3786 }
923ae0ff
RZ		 3787 if (test_opt(sb, DAX)) {
3788 ext4_msg(sb, KERN_ERR, "can't mount with "
3789 "both data=journal and dax");
3790 goto failed_mount;
3791 }
73b92a2a
SK		 3792 if (ext4_has_feature_encrypt(sb)) {
3793 ext4_msg(sb, KERN_WARNING,
3794 "encrypted files will use data=ordered "
3795 "instead of data journaling mode");
3796 }
56889787
TT		 3797 if (test_opt(sb, DELALLOC))
3798 clear_opt(sb, DELALLOC);
001e4a87
TH		 3799 } else {
3800 sb->s_iflags |= SB_I_CGROUPWB;
56889787
TT		 3801 }
3802
1751e8a6
LT		 3803 sb->s_flags = (sb->s_flags & ~SB_POSIXACL) |
3804 (test_opt(sb, POSIX_ACL) ? SB_POSIXACL : 0);
ac27a0ec 3805
617ba13b 3806 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
e2b911c5
DW		 3807 (ext4_has_compat_features(sb) ||
3808 ext4_has_ro_compat_features(sb) ||
3809 ext4_has_incompat_features(sb)))
b31e1552
ES		 3810 ext4_msg(sb, KERN_WARNING,
3811 "feature flags set on rev 0 fs, "
3812 "running e2fsck is recommended");
469108ff 3813
ed3654eb
TT		 3814 if (es->s_creator_os == cpu_to_le32(EXT4_OS_HURD)) {
3815 set_opt2(sb, HURD_COMPAT);
e2b911c5 3816 if (ext4_has_feature_64bit(sb)) {
ed3654eb
TT		 3817 ext4_msg(sb, KERN_ERR,
3818 "The Hurd can't support 64-bit file systems");
3819 goto failed_mount;
3820 }
dec214d0
TE		 3821
3822 /*
3823 * ea_inode feature uses l_i_version field which is not
3824 * available in HURD_COMPAT mode.
3825 */
3826 if (ext4_has_feature_ea_inode(sb)) {
3827 ext4_msg(sb, KERN_ERR,
3828 "ea_inode feature is not supported for Hurd");
3829 goto failed_mount;
3830 }
ed3654eb
TT		 3831 }
3832
2035e776
TT		 3833 if (IS_EXT2_SB(sb)) {
3834 if (ext2_feature_set_ok(sb))
3835 ext4_msg(sb, KERN_INFO, "mounting ext2 file system "
3836 "using the ext4 subsystem");
3837 else {
0d9366d6
ES		 3838 /*
3839 * If we're probing be silent, if this looks like
3840 * it's actually an ext[34] filesystem.
3841 */
3842 if (silent && ext4_feature_set_ok(sb, sb_rdonly(sb)))
3843 goto failed_mount;
2035e776
TT		 3844 ext4_msg(sb, KERN_ERR, "couldn't mount as ext2 due "
3845 "to feature incompatibilities");
3846 goto failed_mount;
3847 }
3848 }
3849
3850 if (IS_EXT3_SB(sb)) {
3851 if (ext3_feature_set_ok(sb))
3852 ext4_msg(sb, KERN_INFO, "mounting ext3 file system "
3853 "using the ext4 subsystem");
3854 else {
0d9366d6
ES		 3855 /*
3856 * If we're probing be silent, if this looks like
3857 * it's actually an ext4 filesystem.
3858 */
3859 if (silent && ext4_feature_set_ok(sb, sb_rdonly(sb)))
3860 goto failed_mount;
2035e776
TT		 3861 ext4_msg(sb, KERN_ERR, "couldn't mount as ext3 due "
3862 "to feature incompatibilities");
3863 goto failed_mount;
3864 }
3865 }
3866
ac27a0ec
DK		 3867 /*
3868 * Check feature flags regardless of the revision level, since we
3869 * previously didn't change the revision level when setting the flags,
3870 * so there is a chance incompat flags are set on a rev 0 filesystem.
3871 */
bc98a42c 3872 if (!ext4_feature_set_ok(sb, (sb_rdonly(sb))))
ac27a0ec 3873 goto failed_mount;
a13fb1a4 3874
261cb20c 3875 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
617ba13b
MC		 3876 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
3877 blocksize > EXT4_MAX_BLOCK_SIZE) {
b31e1552 3878 ext4_msg(sb, KERN_ERR,
8cdf3372
TT		 3879 "Unsupported filesystem blocksize %d (%d log_block_size)",
3880 blocksize, le32_to_cpu(es->s_log_block_size));
3881 goto failed_mount;
3882 }
3883 if (le32_to_cpu(es->s_log_block_size) >
3884 (EXT4_MAX_BLOCK_LOG_SIZE - EXT4_MIN_BLOCK_LOG_SIZE)) {
3885 ext4_msg(sb, KERN_ERR,
3886 "Invalid log block size: %u",
3887 le32_to_cpu(es->s_log_block_size));
ac27a0ec
DK		 3888 goto failed_mount;
3889 }
bfe0a5f4
TT		 3890 if (le32_to_cpu(es->s_log_cluster_size) >
3891 (EXT4_MAX_CLUSTER_LOG_SIZE - EXT4_MIN_BLOCK_LOG_SIZE)) {
3892 ext4_msg(sb, KERN_ERR,
3893 "Invalid log cluster size: %u",
3894 le32_to_cpu(es->s_log_cluster_size));
3895 goto failed_mount;
3896 }
ac27a0ec 3897
5b9554dc
TT		 3898 if (le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) > (blocksize / 4)) {
3899 ext4_msg(sb, KERN_ERR,
3900 "Number of reserved GDT blocks insanely large: %d",
3901 le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks));
3902 goto failed_mount;
3903 }
3904
923ae0ff 3905 if (sbi->s_mount_opt & EXT4_MOUNT_DAX) {
559db4c6
RZ		 3906 if (ext4_has_feature_inline_data(sb)) {
3907 ext4_msg(sb, KERN_ERR, "Cannot use DAX on a filesystem"
3908 " that may contain inline data");
361d24d4 3909 goto failed_mount;
559db4c6 3910 }
80660f20 3911 if (!bdev_dax_supported(sb->s_bdev, blocksize)) {
24f3478d 3912 ext4_msg(sb, KERN_ERR,
361d24d4
ES		 3913 "DAX unsupported by block device.");
3914 goto failed_mount;
24f3478d 3915 }
923ae0ff
RZ		 3916 }
3917
e2b911c5 3918 if (ext4_has_feature_encrypt(sb) && es->s_encryption_level) {
6ddb2447
TT		 3919 ext4_msg(sb, KERN_ERR, "Unsupported encryption level %d",
3920 es->s_encryption_level);
3921 goto failed_mount;
3922 }
3923
ac27a0ec 3924 if (sb->s_blocksize != blocksize) {
ce40733c
AK		 3925 /* Validate the filesystem blocksize */
3926 if (!sb_set_blocksize(sb, blocksize)) {
b31e1552 3927 ext4_msg(sb, KERN_ERR, "bad block size %d",
ce40733c 3928 blocksize);
ac27a0ec
DK		 3929 goto failed_mount;
3930 }
3931
2b2d6d01 3932 brelse(bh);
70bbb3e0
AM		 3933 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3934 offset = do_div(logical_sb_block, blocksize);
a8ac900b 3935 bh = sb_bread_unmovable(sb, logical_sb_block);
ac27a0ec 3936 if (!bh) {
b31e1552
ES		 3937 ext4_msg(sb, KERN_ERR,
3938 "Can't read superblock on 2nd try");
ac27a0ec
DK		 3939 goto failed_mount;
3940 }
2716b802 3941 es = (struct ext4_super_block *)(bh->b_data + offset);
ac27a0ec 3942 sbi->s_es = es;
617ba13b 3943 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
b31e1552
ES		 3944 ext4_msg(sb, KERN_ERR,
3945 "Magic mismatch, very weird!");
ac27a0ec
DK		 3946 goto failed_mount;
3947 }
3948 }
3949
e2b911c5 3950 has_huge_files = ext4_has_feature_huge_file(sb);
f287a1a5
TT		 3951 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
3952 has_huge_files);
3953 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
ac27a0ec 3954
617ba13b
MC		 3955 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
3956 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
3957 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
ac27a0ec
DK		 3958 } else {
3959 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
3960 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
c37e9e01
TT		 3961 if (sbi->s_first_ino < EXT4_GOOD_OLD_FIRST_INO) {
3962 ext4_msg(sb, KERN_ERR, "invalid first ino: %u",
3963 sbi->s_first_ino);
3964 goto failed_mount;
3965 }
617ba13b 3966 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
1330593e 3967 (!is_power_of_2(sbi->s_inode_size)) ||
ac27a0ec 3968 (sbi->s_inode_size > blocksize)) {
b31e1552
ES		 3969 ext4_msg(sb, KERN_ERR,
3970 "unsupported inode size: %d",
2b2d6d01 3971 sbi->s_inode_size);
ac27a0ec
DK		 3972 goto failed_mount;
3973 }
ef7f3835
KS		 3974 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
3975 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
ac27a0ec 3976 }
0b8e58a1 3977
0d1ee42f 3978 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
e2b911c5 3979 if (ext4_has_feature_64bit(sb)) {
8fadc143 3980 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
0d1ee42f 3981 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
d8ea6cf8 3982 !is_power_of_2(sbi->s_desc_size)) {
b31e1552
ES		 3983 ext4_msg(sb, KERN_ERR,
3984 "unsupported descriptor size %lu",
0d1ee42f
AR		 3985 sbi->s_desc_size);
3986 goto failed_mount;
3987 }
3988 } else
3989 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
0b8e58a1 3990
ac27a0ec 3991 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
ac27a0ec 3992 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
0b8e58a1 3993
617ba13b 3994 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
ac27a0ec 3995 if (sbi->s_inodes_per_block == 0)
617ba13b 3996 goto cantfind_ext4;
cd6bb35b
TT		 3997 if (sbi->s_inodes_per_group < sbi->s_inodes_per_block ||
3998 sbi->s_inodes_per_group > blocksize * 8) {
3999 ext4_msg(sb, KERN_ERR, "invalid inodes per group: %lu\n",
4000 sbi->s_blocks_per_group);
4001 goto failed_mount;
4002 }
ac27a0ec
DK		 4003 sbi->s_itb_per_group = sbi->s_inodes_per_group /
4004 sbi->s_inodes_per_block;
0d1ee42f 4005 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
ac27a0ec
DK		 4006 sbi->s_sbh = bh;
4007 sbi->s_mount_state = le16_to_cpu(es->s_state);
e57aa839
FW		 4008 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
4009 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
0b8e58a1 4010
2b2d6d01 4011 for (i = 0; i < 4; i++)
ac27a0ec
DK		 4012 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
4013 sbi->s_def_hash_version = es->s_def_hash_version;
e2b911c5 4014 if (ext4_has_feature_dir_index(sb)) {
23301410
TT		 4015 i = le32_to_cpu(es->s_flags);
4016 if (i & EXT2_FLAGS_UNSIGNED_HASH)
4017 sbi->s_hash_unsigned = 3;
4018 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
f99b2589 4019#ifdef __CHAR_UNSIGNED__
bc98a42c 4020 if (!sb_rdonly(sb))
23301410
TT		 4021 es->s_flags |=
4022 cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
4023 sbi->s_hash_unsigned = 3;
f99b2589 4024#else
bc98a42c 4025 if (!sb_rdonly(sb))
23301410
TT		 4026 es->s_flags |=
4027 cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
f99b2589 4028#endif
23301410 4029 }
f99b2589 4030 }
ac27a0ec 4031
281b5995
TT		 4032 /* Handle clustersize */
4033 clustersize = BLOCK_SIZE << le32_to_cpu(es->s_log_cluster_size);
e2b911c5 4034 has_bigalloc = ext4_has_feature_bigalloc(sb);
281b5995
TT		 4035 if (has_bigalloc) {
4036 if (clustersize < blocksize) {
4037 ext4_msg(sb, KERN_ERR,
4038 "cluster size (%d) smaller than "
4039 "block size (%d)", clustersize, blocksize);
4040 goto failed_mount;
4041 }
4042 sbi->s_cluster_bits = le32_to_cpu(es->s_log_cluster_size) -
4043 le32_to_cpu(es->s_log_block_size);
4044 sbi->s_clusters_per_group =
4045 le32_to_cpu(es->s_clusters_per_group);
4046 if (sbi->s_clusters_per_group > blocksize * 8) {
4047 ext4_msg(sb, KERN_ERR,
4048 "#clusters per group too big: %lu",
4049 sbi->s_clusters_per_group);
4050 goto failed_mount;
4051 }
4052 if (sbi->s_blocks_per_group !=
4053 (sbi->s_clusters_per_group * (clustersize / blocksize))) {
4054 ext4_msg(sb, KERN_ERR, "blocks per group (%lu) and "
4055 "clusters per group (%lu) inconsistent",
4056 sbi->s_blocks_per_group,
4057 sbi->s_clusters_per_group);
4058 goto failed_mount;
4059 }
4060 } else {
4061 if (clustersize != blocksize) {
bfe0a5f4
TT		 4062 ext4_msg(sb, KERN_ERR,
4063 "fragment/cluster size (%d) != "
4064 "block size (%d)", clustersize, blocksize);
4065 goto failed_mount;
281b5995
TT		 4066 }
4067 if (sbi->s_blocks_per_group > blocksize * 8) {
4068 ext4_msg(sb, KERN_ERR,
4069 "#blocks per group too big: %lu",
4070 sbi->s_blocks_per_group);
4071 goto failed_mount;
4072 }
4073 sbi->s_clusters_per_group = sbi->s_blocks_per_group;
4074 sbi->s_cluster_bits = 0;
ac27a0ec 4075 }
281b5995
TT		 4076 sbi->s_cluster_ratio = clustersize / blocksize;
4077
960fd856
TT		 4078 /* Do we have standard group size of clustersize * 8 blocks ? */
4079 if (sbi->s_blocks_per_group == clustersize << 3)
4080 set_opt2(sb, STD_GROUP_SIZE);
4081
bf43d84b
ES		 4082 /*
4083 * Test whether we have more sectors than will fit in sector_t,
4084 * and whether the max offset is addressable by the page cache.
4085 */
5a9ae68a 4086 err = generic_check_addressable(sb->s_blocksize_bits,
30ca22c7 4087 ext4_blocks_count(es));
5a9ae68a 4088 if (err) {
b31e1552 4089 ext4_msg(sb, KERN_ERR, "filesystem"
bf43d84b 4090 " too large to mount safely on this system");
ac27a0ec 4091 if (sizeof(sector_t) < 8)
90c699a9 4092 ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled");
ac27a0ec
DK		 4093 goto failed_mount;
4094 }
4095
617ba13b
MC		 4096 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
4097 goto cantfind_ext4;
e7c95593 4098
0f2ddca6
FTN		 4099 /* check blocks count against device size */
4100 blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
4101 if (blocks_count && ext4_blocks_count(es) > blocks_count) {
b31e1552
ES		 4102 ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
4103 "exceeds size of device (%llu blocks)",
0f2ddca6
FTN		 4104 ext4_blocks_count(es), blocks_count);
4105 goto failed_mount;
4106 }
4107
0b8e58a1
AD		 4108 /*
4109 * It makes no sense for the first data block to be beyond the end
4110 * of the filesystem.
4111 */
4112 if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
5635a62b 4113 ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
b31e1552
ES		 4114 "block %u is beyond end of filesystem (%llu)",
4115 le32_to_cpu(es->s_first_data_block),
4116 ext4_blocks_count(es));
e7c95593
ES		 4117 goto failed_mount;
4118 }
bfe0a5f4
TT		 4119 if ((es->s_first_data_block == 0) && (es->s_log_block_size == 0) &&
4120 (sbi->s_cluster_ratio == 1)) {
4121 ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
4122 "block is 0 with a 1k block and cluster size");
4123 goto failed_mount;
4124 }
4125
bd81d8ee
LV		 4126 blocks_count = (ext4_blocks_count(es) -
4127 le32_to_cpu(es->s_first_data_block) +
4128 EXT4_BLOCKS_PER_GROUP(sb) - 1);
4129 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
4ec11028 4130 if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
b31e1552 4131 ext4_msg(sb, KERN_WARNING, "groups count too large: %u "
4ec11028 4132 "(block count %llu, first data block %u, "
b31e1552 4133 "blocks per group %lu)", sbi->s_groups_count,
4ec11028
TT		 4134 ext4_blocks_count(es),
4135 le32_to_cpu(es->s_first_data_block),
4136 EXT4_BLOCKS_PER_GROUP(sb));
4137 goto failed_mount;
4138 }
bd81d8ee 4139 sbi->s_groups_count = blocks_count;
fb0a387d
ES		 4140 sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
4141 (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
9e463084
TT		 4142 if (((u64)sbi->s_groups_count * sbi->s_inodes_per_group) !=
4143 le32_to_cpu(es->s_inodes_count)) {
4144 ext4_msg(sb, KERN_ERR, "inodes count not valid: %u vs %llu",
4145 le32_to_cpu(es->s_inodes_count),
4146 ((u64)sbi->s_groups_count * sbi->s_inodes_per_group));
4147 ret = -EINVAL;
4148 goto failed_mount;
4149 }
617ba13b
MC		 4150 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
4151 EXT4_DESC_PER_BLOCK(sb);
3a4b77cd 4152 if (ext4_has_feature_meta_bg(sb)) {
2ba3e6e8 4153 if (le32_to_cpu(es->s_first_meta_bg) > db_count) {
3a4b77cd
EG		 4154 ext4_msg(sb, KERN_WARNING,
4155 "first meta block group too large: %u "
4156 "(group descriptor block count %u)",
4157 le32_to_cpu(es->s_first_meta_bg), db_count);
4158 goto failed_mount;
4159 }
4160 }
344476e1
KC		 4161 sbi->s_group_desc = kvmalloc_array(db_count,
4162 sizeof(struct buffer_head *),
4163 GFP_KERNEL);
ac27a0ec 4164 if (sbi->s_group_desc == NULL) {
b31e1552 4165 ext4_msg(sb, KERN_ERR, "not enough memory");
2cde417d 4166 ret = -ENOMEM;
ac27a0ec
DK		 4167 goto failed_mount;
4168 }
4169
705895b6 4170 bgl_lock_init(sbi->s_blockgroup_lock);
ac27a0ec 4171
85c8f176
AP		 4172 /* Pre-read the descriptors into the buffer cache */
4173 for (i = 0; i < db_count; i++) {
4174 block = descriptor_loc(sb, logical_sb_block, i);
4175 sb_breadahead(sb, block);
4176 }
4177
ac27a0ec 4178 for (i = 0; i < db_count; i++) {
70bbb3e0 4179 block = descriptor_loc(sb, logical_sb_block, i);
a8ac900b 4180 sbi->s_group_desc[i] = sb_bread_unmovable(sb, block);
ac27a0ec 4181 if (!sbi->s_group_desc[i]) {
b31e1552
ES		 4182 ext4_msg(sb, KERN_ERR,
4183 "can't read group descriptor %d", i);
ac27a0ec
DK		 4184 db_count = i;
4185 goto failed_mount2;
4186 }
4187 }
44de022c 4188 sbi->s_gdb_count = db_count;
829fa70d 4189 if (!ext4_check_descriptors(sb, logical_sb_block, &first_not_zeroed)) {
b31e1552 4190 ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
6a797d27 4191 ret = -EFSCORRUPTED;
f9ae9cf5 4192 goto failed_mount2;
ac27a0ec 4193 }
772cb7c8 4194
235699a8 4195 timer_setup(&sbi->s_err_report, print_daily_error_info, 0);
04496411 4196
a75ae78f 4197 /* Register extent status tree shrinker */
eb68d0e2 4198 if (ext4_es_register_shrinker(sbi))
ce7e010a 4199 goto failed_mount3;
ce7e010a 4200
c9de560d 4201 sbi->s_stripe = ext4_get_stripe_size(sbi);
67a5da56 4202 sbi->s_extent_max_zeroout_kb = 32;
c9de560d 4203
f9ae9cf5
TT		 4204 /*
4205 * set up enough so that it can read an inode
4206 */
f6e63f90 4207 sb->s_op = &ext4_sops;
617ba13b
MC		 4208 sb->s_export_op = &ext4_export_ops;
4209 sb->s_xattr = ext4_xattr_handlers;
643fa961 4210#ifdef CONFIG_FS_ENCRYPTION
a7550b30 4211 sb->s_cop = &ext4_cryptops;
ffcc4182 4212#endif
ac27a0ec 4213#ifdef CONFIG_QUOTA
617ba13b 4214 sb->dq_op = &ext4_quota_operations;
e2b911c5 4215 if (ext4_has_feature_quota(sb))
1fa5efe3 4216 sb->s_qcop = &dquot_quotactl_sysfile_ops;
262b4662
JK		 4217 else
4218 sb->s_qcop = &ext4_qctl_operations;
689c958c 4219 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP | QTYPE_MASK_PRJ;
ac27a0ec 4220#endif
85787090 4221 memcpy(&sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
f2fa2ffc 4222
ac27a0ec 4223 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
3b9d4ed2 4224 mutex_init(&sbi->s_orphan_lock);
ac27a0ec
DK		 4225
4226 sb->s_root = NULL;
4227
4228 needs_recovery = (es->s_last_orphan != 0 ||
e2b911c5 4229 ext4_has_feature_journal_needs_recovery(sb));
ac27a0ec 4230
bc98a42c 4231 if (ext4_has_feature_mmp(sb) && !sb_rdonly(sb))
c5e06d10 4232 if (ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block)))
50460fe8 4233 goto failed_mount3a;
c5e06d10 4234
ac27a0ec
DK		 4235 /*
4236 * The first inode we look at is the journal inode. Don't try
4237 * root first: it may be modified in the journal!
4238 */
e2b911c5 4239 if (!test_opt(sb, NOLOAD) && ext4_has_feature_journal(sb)) {
4753d8a2
TT		 4240 err = ext4_load_journal(sb, es, journal_devnum);
4241 if (err)
50460fe8 4242 goto failed_mount3a;
bc98a42c 4243 } else if (test_opt(sb, NOLOAD) && !sb_rdonly(sb) &&
e2b911c5 4244 ext4_has_feature_journal_needs_recovery(sb)) {
b31e1552
ES		 4245 ext4_msg(sb, KERN_ERR, "required journal recovery "
4246 "suppressed and not mounted read-only");
744692dc 4247 goto failed_mount_wq;
ac27a0ec 4248 } else {
1e381f60
DM		 4249 /* Nojournal mode, all journal mount options are illegal */
4250 if (test_opt2(sb, EXPLICIT_JOURNAL_CHECKSUM)) {
4251 ext4_msg(sb, KERN_ERR, "can't mount with "
4252 "journal_checksum, fs mounted w/o journal");
4253 goto failed_mount_wq;
4254 }
4255 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
4256 ext4_msg(sb, KERN_ERR, "can't mount with "
4257 "journal_async_commit, fs mounted w/o journal");
4258 goto failed_mount_wq;
4259 }
4260 if (sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) {
4261 ext4_msg(sb, KERN_ERR, "can't mount with "
4262 "commit=%lu, fs mounted w/o journal",
4263 sbi->s_commit_interval / HZ);
4264 goto failed_mount_wq;
4265 }
4266 if (EXT4_MOUNT_DATA_FLAGS &
4267 (sbi->s_mount_opt ^ sbi->s_def_mount_opt)) {
4268 ext4_msg(sb, KERN_ERR, "can't mount with "
4269 "data=, fs mounted w/o journal");
4270 goto failed_mount_wq;
4271 }
4272 sbi->s_def_mount_opt &= EXT4_MOUNT_JOURNAL_CHECKSUM;
4273 clear_opt(sb, JOURNAL_CHECKSUM);
fd8c37ec 4274 clear_opt(sb, DATA_FLAGS);
0390131b
FM		 4275 sbi->s_journal = NULL;
4276 needs_recovery = 0;
4277 goto no_journal;
ac27a0ec
DK		 4278 }
4279
e2b911c5 4280 if (ext4_has_feature_64bit(sb) &&
eb40a09c
JS		 4281 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
4282 JBD2_FEATURE_INCOMPAT_64BIT)) {
b31e1552 4283 ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
744692dc 4284 goto failed_mount_wq;
eb40a09c
JS		 4285 }
4286
25ed6e8a
DW		 4287 if (!set_journal_csum_feature_set(sb)) {
4288 ext4_msg(sb, KERN_ERR, "Failed to set journal checksum "
4289 "feature set");
4290 goto failed_mount_wq;
d4da6c9c 4291 }
818d276c 4292
ac27a0ec
DK		 4293 /* We have now updated the journal if required, so we can
4294 * validate the data journaling mode. */
4295 switch (test_opt(sb, DATA_FLAGS)) {
4296 case 0:
4297 /* No mode set, assume a default based on the journal
63f57933
AM		 4298 * capabilities: ORDERED_DATA if the journal can
4299 * cope, else JOURNAL_DATA
4300 */
dab291af 4301 if (jbd2_journal_check_available_features
27f394a7 4302 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
fd8c37ec 4303 set_opt(sb, ORDERED_DATA);
27f394a7
TN		 4304 sbi->s_def_mount_opt |= EXT4_MOUNT_ORDERED_DATA;
4305 } else {
fd8c37ec 4306 set_opt(sb, JOURNAL_DATA);
27f394a7
TN		 4307 sbi->s_def_mount_opt |= EXT4_MOUNT_JOURNAL_DATA;
4308 }
ac27a0ec
DK		 4309 break;
4310
617ba13b
MC		 4311 case EXT4_MOUNT_ORDERED_DATA:
4312 case EXT4_MOUNT_WRITEBACK_DATA:
dab291af
MC		 4313 if (!jbd2_journal_check_available_features
4314 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
b31e1552
ES		 4315 ext4_msg(sb, KERN_ERR, "Journal does not support "
4316 "requested data journaling mode");
744692dc 4317 goto failed_mount_wq;
ac27a0ec
DK		 4318 }
4319 default:
4320 break;
4321 }
ab04df78
JK		 4322
4323 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA &&
4324 test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
4325 ext4_msg(sb, KERN_ERR, "can't mount with "
4326 "journal_async_commit in data=ordered mode");
4327 goto failed_mount_wq;
4328 }
4329
b3881f74 4330 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
ac27a0ec 4331
18aadd47
BJ		 4332 sbi->s_journal->j_commit_callback = ext4_journal_commit_callback;
4333
ce7e010a 4334no_journal:
cdb7ee4c
TE		 4335 if (!test_opt(sb, NO_MBCACHE)) {
4336 sbi->s_ea_block_cache = ext4_xattr_create_cache();
4337 if (!sbi->s_ea_block_cache) {
dec214d0 4338 ext4_msg(sb, KERN_ERR,
cdb7ee4c 4339 "Failed to create ea_block_cache");
dec214d0
TE		 4340 goto failed_mount_wq;
4341 }
cdb7ee4c
TE		 4342
4343 if (ext4_has_feature_ea_inode(sb)) {
4344 sbi->s_ea_inode_cache = ext4_xattr_create_cache();
4345 if (!sbi->s_ea_inode_cache) {
4346 ext4_msg(sb, KERN_ERR,
4347 "Failed to create ea_inode_cache");
4348 goto failed_mount_wq;
4349 }
4350 }
9c191f70
M		 4351 }
4352
e2b911c5 4353 if ((DUMMY_ENCRYPTION_ENABLED(sbi) || ext4_has_feature_encrypt(sb)) &&
09cbfeaf 4354 (blocksize != PAGE_SIZE)) {
1cb767cd
TT		 4355 ext4_msg(sb, KERN_ERR,
4356 "Unsupported blocksize for fs encryption");
4357 goto failed_mount_wq;
4358 }
4359
bc98a42c 4360 if (DUMMY_ENCRYPTION_ENABLED(sbi) && !sb_rdonly(sb) &&
e2b911c5
DW		 4361 !ext4_has_feature_encrypt(sb)) {
4362 ext4_set_feature_encrypt(sb);
6ddb2447
TT		 4363 ext4_commit_super(sb, 1);
4364 }
4365
952fc18e
TT		 4366 /*
4367 * Get the # of file system overhead blocks from the
4368 * superblock if present.
4369 */
4370 if (es->s_overhead_clusters)
4371 sbi->s_overhead = le32_to_cpu(es->s_overhead_clusters);
4372 else {
07aa2ea1
LC		 4373 err = ext4_calculate_overhead(sb);
4374 if (err)
952fc18e
TT		 4375 goto failed_mount_wq;
4376 }
4377
fd89d5f2
TH		 4378 /*
4379 * The maximum number of concurrent works can be high and
4380 * concurrency isn't really necessary. Limit it to 1.
4381 */
2e8fa54e
JK		 4382 EXT4_SB(sb)->rsv_conversion_wq =
4383 alloc_workqueue("ext4-rsv-conversion", WQ_MEM_RECLAIM | WQ_UNBOUND, 1);
4384 if (!EXT4_SB(sb)->rsv_conversion_wq) {
4385 printk(KERN_ERR "EXT4-fs: failed to create workqueue\n");
07aa2ea1 4386 ret = -ENOMEM;
2e8fa54e
JK		 4387 goto failed_mount4;
4388 }
4389
ac27a0ec 4390 /*
dab291af 4391 * The jbd2_journal_load will have done any necessary log recovery,
ac27a0ec
DK		 4392 * so we can safely mount the rest of the filesystem now.
4393 */
4394
8a363970 4395 root = ext4_iget(sb, EXT4_ROOT_INO, EXT4_IGET_SPECIAL);
1d1fe1ee 4396 if (IS_ERR(root)) {
b31e1552 4397 ext4_msg(sb, KERN_ERR, "get root inode failed");
1d1fe1ee 4398 ret = PTR_ERR(root);
32a9bb57 4399 root = NULL;
ac27a0ec
DK		 4400 goto failed_mount4;
4401 }
4402 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
b31e1552 4403 ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
94bf608a 4404 iput(root);
ac27a0ec
DK		 4405 goto failed_mount4;
4406 }
48fde701 4407 sb->s_root = d_make_root(root);
1d1fe1ee 4408 if (!sb->s_root) {
b31e1552 4409 ext4_msg(sb, KERN_ERR, "get root dentry failed");
1d1fe1ee
DH		 4410 ret = -ENOMEM;
4411 goto failed_mount4;
4412 }
ac27a0ec 4413
c89128a0
JK		 4414 ret = ext4_setup_super(sb, es, sb_rdonly(sb));
4415 if (ret == -EROFS) {
1751e8a6 4416 sb->s_flags |= SB_RDONLY;
c89128a0
JK		 4417 ret = 0;
4418 } else if (ret)
4419 goto failed_mount4a;
ef7f3835 4420
7bc04c5c 4421 ext4_clamp_want_extra_isize(sb);
ef7f3835 4422
b5799018 4423 ext4_set_resv_clusters(sb);
27dd4385 4424
6fd058f7
TT		 4425 err = ext4_setup_system_zone(sb);
4426 if (err) {
b31e1552 4427 ext4_msg(sb, KERN_ERR, "failed to initialize system "
fbe845dd 4428 "zone (%d)", err);
f9ae9cf5
TT		 4429 goto failed_mount4a;
4430 }
4431
4432 ext4_ext_init(sb);
4433 err = ext4_mb_init(sb);
4434 if (err) {
4435 ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)",
4436 err);
dcf2d804 4437 goto failed_mount5;
c2774d84
AK		 4438 }
4439
d5e03cbb
TT		 4440 block = ext4_count_free_clusters(sb);
4441 ext4_free_blocks_count_set(sbi->s_es,
4442 EXT4_C2B(sbi, block));
4274f516 4443 ext4_superblock_csum_set(sb);
908c7f19
TH		 4444 err = percpu_counter_init(&sbi->s_freeclusters_counter, block,
4445 GFP_KERNEL);
d5e03cbb
TT		 4446 if (!err) {
4447 unsigned long freei = ext4_count_free_inodes(sb);
4448 sbi->s_es->s_free_inodes_count = cpu_to_le32(freei);
4274f516 4449 ext4_superblock_csum_set(sb);
908c7f19
TH		 4450 err = percpu_counter_init(&sbi->s_freeinodes_counter, freei,
4451 GFP_KERNEL);
d5e03cbb
TT		 4452 }
4453 if (!err)
4454 err = percpu_counter_init(&sbi->s_dirs_counter,
908c7f19 4455 ext4_count_dirs(sb), GFP_KERNEL);
d5e03cbb 4456 if (!err)
908c7f19
TH		 4457 err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0,
4458 GFP_KERNEL);
c8585c6f
DJ		 4459 if (!err)
4460 err = percpu_init_rwsem(&sbi->s_journal_flag_rwsem);
4461
d5e03cbb
TT		 4462 if (err) {
4463 ext4_msg(sb, KERN_ERR, "insufficient memory");
4464 goto failed_mount6;
4465 }
4466
e2b911c5 4467 if (ext4_has_feature_flex_bg(sb))
d5e03cbb
TT		 4468 if (!ext4_fill_flex_info(sb)) {
4469 ext4_msg(sb, KERN_ERR,
4470 "unable to initialize "
4471 "flex_bg meta info!");
4472 goto failed_mount6;
4473 }
4474
bfff6873
LC		 4475 err = ext4_register_li_request(sb, first_not_zeroed);
4476 if (err)
dcf2d804 4477 goto failed_mount6;
bfff6873 4478
b5799018 4479 err = ext4_register_sysfs(sb);
dcf2d804
TM		 4480 if (err)
4481 goto failed_mount7;
3197ebdb 4482
9b2ff357
JK		 4483#ifdef CONFIG_QUOTA
4484 /* Enable quota usage during mount. */
bc98a42c 4485 if (ext4_has_feature_quota(sb) && !sb_rdonly(sb)) {
9b2ff357
JK		 4486 err = ext4_enable_quotas(sb);
4487 if (err)
4488 goto failed_mount8;
4489 }
4490#endif /* CONFIG_QUOTA */
4491
617ba13b
MC		 4492 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
4493 ext4_orphan_cleanup(sb, es);
4494 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
0390131b 4495 if (needs_recovery) {
b31e1552 4496 ext4_msg(sb, KERN_INFO, "recovery complete");
0390131b
FM		 4497 ext4_mark_recovery_complete(sb, es);
4498 }
4499 if (EXT4_SB(sb)->s_journal) {
4500 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
4501 descr = " journalled data mode";
4502 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
4503 descr = " ordered data mode";
4504 else
4505 descr = " writeback data mode";
4506 } else
4507 descr = "out journal";
4508
79add3a3
LC		 4509 if (test_opt(sb, DISCARD)) {
4510 struct request_queue *q = bdev_get_queue(sb->s_bdev);
4511 if (!blk_queue_discard(q))
4512 ext4_msg(sb, KERN_WARNING,
4513 "mounting with \"discard\" option, but "
4514 "the device does not support discard");
4515 }
4516
e294a537
TT		 4517 if (___ratelimit(&ext4_mount_msg_ratelimit, "EXT4-fs mount"))
4518 ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. "
5aee0f8a
TT		 4519 "Opts: %.*s%s%s", descr,
4520 (int) sizeof(sbi->s_es->s_mount_opts),
4521 sbi->s_es->s_mount_opts,
e294a537 4522 *sbi->s_es->s_mount_opts ? "; " : "", orig_data);
ac27a0ec 4523
66e61a9e
TT		 4524 if (es->s_error_count)
4525 mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */
ac27a0ec 4526
efbed4dc
TT		 4527 /* Enable message ratelimiting. Default is 10 messages per 5 secs. */
4528 ratelimit_state_init(&sbi->s_err_ratelimit_state, 5 * HZ, 10);
4529 ratelimit_state_init(&sbi->s_warning_ratelimit_state, 5 * HZ, 10);
4530 ratelimit_state_init(&sbi->s_msg_ratelimit_state, 5 * HZ, 10);
4531
d4c402d9 4532 kfree(orig_data);
ac27a0ec
DK		 4533 return 0;
4534
617ba13b 4535cantfind_ext4:
ac27a0ec 4536 if (!silent)
b31e1552 4537 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
ac27a0ec
DK		 4538 goto failed_mount;
4539
72ba7450
TT		 4540#ifdef CONFIG_QUOTA
4541failed_mount8:
ebd173be 4542 ext4_unregister_sysfs(sb);
72ba7450 4543#endif
dcf2d804
TM		 4544failed_mount7:
4545 ext4_unregister_li_request(sb);
4546failed_mount6:
f9ae9cf5 4547 ext4_mb_release(sb);
d5e03cbb 4548 if (sbi->s_flex_groups)
b93b41d4 4549 kvfree(sbi->s_flex_groups);
d5e03cbb
TT		 4550 percpu_counter_destroy(&sbi->s_freeclusters_counter);
4551 percpu_counter_destroy(&sbi->s_freeinodes_counter);
4552 percpu_counter_destroy(&sbi->s_dirs_counter);
4553 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
af18e35b 4554 percpu_free_rwsem(&sbi->s_journal_flag_rwsem);
00764937 4555failed_mount5:
f9ae9cf5
TT		 4556 ext4_ext_release(sb);
4557 ext4_release_system_zone(sb);
4558failed_mount4a:
94bf608a 4559 dput(sb->s_root);
32a9bb57 4560 sb->s_root = NULL;
94bf608a 4561failed_mount4:
b31e1552 4562 ext4_msg(sb, KERN_ERR, "mount failed");
2e8fa54e
JK		 4563 if (EXT4_SB(sb)->rsv_conversion_wq)
4564 destroy_workqueue(EXT4_SB(sb)->rsv_conversion_wq);
4c0425ff 4565failed_mount_wq:
50c15df6
CX		 4566 ext4_xattr_destroy_cache(sbi->s_ea_inode_cache);
4567 sbi->s_ea_inode_cache = NULL;
4568
4569 ext4_xattr_destroy_cache(sbi->s_ea_block_cache);
4570 sbi->s_ea_block_cache = NULL;
4571
0390131b
FM		 4572 if (sbi->s_journal) {
4573 jbd2_journal_destroy(sbi->s_journal);
4574 sbi->s_journal = NULL;
4575 }
50460fe8 4576failed_mount3a:
d3922a77 4577 ext4_es_unregister_shrinker(sbi);
eb68d0e2 4578failed_mount3:
9105bb14 4579 del_timer_sync(&sbi->s_err_report);
c5e06d10
JL		 4580 if (sbi->s_mmp_tsk)
4581 kthread_stop(sbi->s_mmp_tsk);
ac27a0ec
DK		 4582failed_mount2:
4583 for (i = 0; i < db_count; i++)
4584 brelse(sbi->s_group_desc[i]);
b93b41d4 4585 kvfree(sbi->s_group_desc);
ac27a0ec 4586failed_mount:
0441984a
DW		 4587 if (sbi->s_chksum_driver)
4588 crypto_free_shash(sbi->s_chksum_driver);
ac27a0ec 4589#ifdef CONFIG_QUOTA
a2d4a646 4590 for (i = 0; i < EXT4_MAXQUOTAS; i++)
ac27a0ec
DK		 4591 kfree(sbi->s_qf_names[i]);
4592#endif
617ba13b 4593 ext4_blkdev_remove(sbi);
ac27a0ec
DK		 4594 brelse(bh);
4595out_fail:
4596 sb->s_fs_info = NULL;
f6830165 4597 kfree(sbi->s_blockgroup_lock);
5aee0f8a 4598out_free_base:
ac27a0ec 4599 kfree(sbi);
d4c402d9 4600 kfree(orig_data);
5e405595 4601 fs_put_dax(dax_dev);
07aa2ea1 4602 return err ? err : ret;
ac27a0ec
DK		 4603}
4604
4605/*
4606 * Setup any per-fs journal parameters now. We'll do this both on
4607 * initial mount, once the journal has been initialised but before we've
4608 * done any recovery; and again on any subsequent remount.
4609 */
617ba13b 4610static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
ac27a0ec 4611{
617ba13b 4612 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4613
30773840
TT		 4614 journal->j_commit_interval = sbi->s_commit_interval;
4615 journal->j_min_batch_time = sbi->s_min_batch_time;
4616 journal->j_max_batch_time = sbi->s_max_batch_time;
ac27a0ec 4617
a931da6a 4618 write_lock(&journal->j_state_lock);
ac27a0ec 4619 if (test_opt(sb, BARRIER))
dab291af 4620 journal->j_flags |= JBD2_BARRIER;
ac27a0ec 4621 else
dab291af 4622 journal->j_flags &= ~JBD2_BARRIER;
5bf5683a
HK		 4623 if (test_opt(sb, DATA_ERR_ABORT))
4624 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
4625 else
4626 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
a931da6a 4627 write_unlock(&journal->j_state_lock);
ac27a0ec
DK		 4628}
4629
c6cb7e77
EW		 4630static struct inode *ext4_get_journal_inode(struct super_block *sb,
4631 unsigned int journal_inum)
ac27a0ec
DK		 4632{
4633 struct inode *journal_inode;
ac27a0ec 4634
c6cb7e77
EW		 4635 /*
4636 * Test for the existence of a valid inode on disk. Bad things
4637 * happen if we iget() an unused inode, as the subsequent iput()
4638 * will try to delete it.
4639 */
8a363970 4640 journal_inode = ext4_iget(sb, journal_inum, EXT4_IGET_SPECIAL);
1d1fe1ee 4641 if (IS_ERR(journal_inode)) {
b31e1552 4642 ext4_msg(sb, KERN_ERR, "no journal found");
ac27a0ec
DK		 4643 return NULL;
4644 }
4645 if (!journal_inode->i_nlink) {
4646 make_bad_inode(journal_inode);
4647 iput(journal_inode);
b31e1552 4648 ext4_msg(sb, KERN_ERR, "journal inode is deleted");
ac27a0ec
DK		 4649 return NULL;
4650 }
4651
e5f8eab8 4652 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
ac27a0ec 4653 journal_inode, journal_inode->i_size);
1d1fe1ee 4654 if (!S_ISREG(journal_inode->i_mode)) {
b31e1552 4655 ext4_msg(sb, KERN_ERR, "invalid journal inode");
ac27a0ec
DK		 4656 iput(journal_inode);
4657 return NULL;
4658 }
c6cb7e77
EW		 4659 return journal_inode;
4660}
4661
4662static journal_t *ext4_get_journal(struct super_block *sb,
4663 unsigned int journal_inum)
4664{
4665 struct inode *journal_inode;
4666 journal_t *journal;
4667
4668 BUG_ON(!ext4_has_feature_journal(sb));
4669
4670 journal_inode = ext4_get_journal_inode(sb, journal_inum);
4671 if (!journal_inode)
4672 return NULL;
ac27a0ec 4673
dab291af 4674 journal = jbd2_journal_init_inode(journal_inode);
ac27a0ec 4675 if (!journal) {
b31e1552 4676 ext4_msg(sb, KERN_ERR, "Could not load journal inode");
ac27a0ec
DK		 4677 iput(journal_inode);
4678 return NULL;
4679 }
4680 journal->j_private = sb;
617ba13b 4681 ext4_init_journal_params(sb, journal);
ac27a0ec
DK		 4682 return journal;
4683}
4684
617ba13b 4685static journal_t *ext4_get_dev_journal(struct super_block *sb,
ac27a0ec
DK		 4686 dev_t j_dev)
4687{
2b2d6d01 4688 struct buffer_head *bh;
ac27a0ec 4689 journal_t *journal;
617ba13b
MC		 4690 ext4_fsblk_t start;
4691 ext4_fsblk_t len;
ac27a0ec 4692 int hblock, blocksize;
617ba13b 4693 ext4_fsblk_t sb_block;
ac27a0ec 4694 unsigned long offset;
2b2d6d01 4695 struct ext4_super_block *es;
ac27a0ec
DK		 4696 struct block_device *bdev;
4697
e2b911c5 4698 BUG_ON(!ext4_has_feature_journal(sb));
0390131b 4699
b31e1552 4700 bdev = ext4_blkdev_get(j_dev, sb);
ac27a0ec
DK		 4701 if (bdev == NULL)
4702 return NULL;
4703
ac27a0ec 4704 blocksize = sb->s_blocksize;
e1defc4f 4705 hblock = bdev_logical_block_size(bdev);
ac27a0ec 4706 if (blocksize < hblock) {
b31e1552
ES		 4707 ext4_msg(sb, KERN_ERR,
4708 "blocksize too small for journal device");
ac27a0ec
DK		 4709 goto out_bdev;
4710 }
4711
617ba13b
MC		 4712 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
4713 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
ac27a0ec
DK		 4714 set_blocksize(bdev, blocksize);
4715 if (!(bh = __bread(bdev, sb_block, blocksize))) {
b31e1552
ES		 4716 ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
4717 "external journal");
ac27a0ec
DK		 4718 goto out_bdev;
4719 }
4720
2716b802 4721 es = (struct ext4_super_block *) (bh->b_data + offset);
617ba13b 4722 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
ac27a0ec 4723 !(le32_to_cpu(es->s_feature_incompat) &
617ba13b 4724 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
b31e1552
ES		 4725 ext4_msg(sb, KERN_ERR, "external journal has "
4726 "bad superblock");
ac27a0ec
DK		 4727 brelse(bh);
4728 goto out_bdev;
4729 }
4730
df4763be
DW		 4731 if ((le32_to_cpu(es->s_feature_ro_compat) &
4732 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) &&
4733 es->s_checksum != ext4_superblock_csum(sb, es)) {
4734 ext4_msg(sb, KERN_ERR, "external journal has "
4735 "corrupt superblock");
4736 brelse(bh);
4737 goto out_bdev;
4738 }
4739
617ba13b 4740 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
b31e1552 4741 ext4_msg(sb, KERN_ERR, "journal UUID does not match");
ac27a0ec
DK		 4742 brelse(bh);
4743 goto out_bdev;
4744 }
4745
bd81d8ee 4746 len = ext4_blocks_count(es);
ac27a0ec
DK		 4747 start = sb_block + 1;
4748 brelse(bh); /* we're done with the superblock */
4749
dab291af 4750 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
ac27a0ec
DK		 4751 start, len, blocksize);
4752 if (!journal) {
b31e1552 4753 ext4_msg(sb, KERN_ERR, "failed to create device journal");
ac27a0ec
DK		 4754 goto out_bdev;
4755 }
4756 journal->j_private = sb;
dfec8a14 4757 ll_rw_block(REQ_OP_READ, REQ_META | REQ_PRIO, 1, &journal->j_sb_buffer);
ac27a0ec
DK		 4758 wait_on_buffer(journal->j_sb_buffer);
4759 if (!buffer_uptodate(journal->j_sb_buffer)) {
b31e1552 4760 ext4_msg(sb, KERN_ERR, "I/O error on journal device");
ac27a0ec
DK		 4761 goto out_journal;
4762 }
4763 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
b31e1552
ES		 4764 ext4_msg(sb, KERN_ERR, "External journal has more than one "
4765 "user (unsupported) - %d",
ac27a0ec
DK		 4766 be32_to_cpu(journal->j_superblock->s_nr_users));
4767 goto out_journal;
4768 }
617ba13b
MC		 4769 EXT4_SB(sb)->journal_bdev = bdev;
4770 ext4_init_journal_params(sb, journal);
ac27a0ec 4771 return journal;
0b8e58a1 4772
ac27a0ec 4773out_journal:
dab291af 4774 jbd2_journal_destroy(journal);
ac27a0ec 4775out_bdev:
617ba13b 4776 ext4_blkdev_put(bdev);
ac27a0ec
DK		 4777 return NULL;
4778}
4779
617ba13b
MC		 4780static int ext4_load_journal(struct super_block *sb,
4781 struct ext4_super_block *es,
ac27a0ec
DK		 4782 unsigned long journal_devnum)
4783{
4784 journal_t *journal;
4785 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
4786 dev_t journal_dev;
4787 int err = 0;
4788 int really_read_only;
4789
e2b911c5 4790 BUG_ON(!ext4_has_feature_journal(sb));
0390131b 4791
ac27a0ec
DK		 4792 if (journal_devnum &&
4793 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
b31e1552
ES		 4794 ext4_msg(sb, KERN_INFO, "external journal device major/minor "
4795 "numbers have changed");
ac27a0ec
DK		 4796 journal_dev = new_decode_dev(journal_devnum);
4797 } else
4798 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
4799
4800 really_read_only = bdev_read_only(sb->s_bdev);
4801
4802 /*
4803 * Are we loading a blank journal or performing recovery after a
4804 * crash? For recovery, we need to check in advance whether we
4805 * can get read-write access to the device.
4806 */
e2b911c5 4807 if (ext4_has_feature_journal_needs_recovery(sb)) {
bc98a42c 4808 if (sb_rdonly(sb)) {
b31e1552
ES		 4809 ext4_msg(sb, KERN_INFO, "INFO: recovery "
4810 "required on readonly filesystem");
ac27a0ec 4811 if (really_read_only) {
b31e1552 4812 ext4_msg(sb, KERN_ERR, "write access "
d98bf8cd
SR		 4813 "unavailable, cannot proceed "
4814 "(try mounting with noload)");
ac27a0ec
DK		 4815 return -EROFS;
4816 }
b31e1552
ES		 4817 ext4_msg(sb, KERN_INFO, "write access will "
4818 "be enabled during recovery");
ac27a0ec
DK		 4819 }
4820 }
4821
4822 if (journal_inum && journal_dev) {
b31e1552
ES		 4823 ext4_msg(sb, KERN_ERR, "filesystem has both journal "
4824 "and inode journals!");
ac27a0ec
DK		 4825 return -EINVAL;
4826 }
4827
4828 if (journal_inum) {
617ba13b 4829 if (!(journal = ext4_get_journal(sb, journal_inum)))
ac27a0ec
DK		 4830 return -EINVAL;
4831 } else {
617ba13b 4832 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
ac27a0ec
DK		 4833 return -EINVAL;
4834 }
4835
90576c0b 4836 if (!(journal->j_flags & JBD2_BARRIER))
b31e1552 4837 ext4_msg(sb, KERN_INFO, "barriers disabled");
4776004f 4838
e2b911c5 4839 if (!ext4_has_feature_journal_needs_recovery(sb))
dab291af 4840 err = jbd2_journal_wipe(journal, !really_read_only);
1c13d5c0
TT		 4841 if (!err) {
4842 char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL);
4843 if (save)
4844 memcpy(save, ((char *) es) +
4845 EXT4_S_ERR_START, EXT4_S_ERR_LEN);
dab291af 4846 err = jbd2_journal_load(journal);
1c13d5c0
TT		 4847 if (save)
4848 memcpy(((char *) es) + EXT4_S_ERR_START,
4849 save, EXT4_S_ERR_LEN);
4850 kfree(save);
4851 }
ac27a0ec
DK		 4852
4853 if (err) {
b31e1552 4854 ext4_msg(sb, KERN_ERR, "error loading journal");
dab291af 4855 jbd2_journal_destroy(journal);
ac27a0ec
DK		 4856 return err;
4857 }
4858
617ba13b
MC		 4859 EXT4_SB(sb)->s_journal = journal;
4860 ext4_clear_journal_err(sb, es);
ac27a0ec 4861
c41303ce 4862 if (!really_read_only && journal_devnum &&
ac27a0ec
DK		 4863 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
4864 es->s_journal_dev = cpu_to_le32(journal_devnum);
ac27a0ec
DK		 4865
4866 /* Make sure we flush the recovery flag to disk. */
e2d67052 4867 ext4_commit_super(sb, 1);
ac27a0ec
DK		 4868 }
4869
4870 return 0;
4871}
4872
e2d67052 4873static int ext4_commit_super(struct super_block *sb, int sync)
ac27a0ec 4874{
e2d67052 4875 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
617ba13b 4876 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
c4be0c1d 4877 int error = 0;
ac27a0ec 4878
bdfe0cbd 4879 if (!sbh || block_device_ejected(sb))
c4be0c1d 4880 return error;
a17712c8
JD		 4881
4882 /*
4883 * The superblock bh should be mapped, but it might not be if the
4884 * device was hot-removed. Not much we can do but fail the I/O.
4885 */
4886 if (!buffer_mapped(sbh))
4887 return error;
4888
71290b36
TT		 4889 /*
4890 * If the file system is mounted read-only, don't update the
4891 * superblock write time. This avoids updating the superblock
4892 * write time when we are mounting the root file system
4893 * read/only but we need to replay the journal; at that point,
4894 * for people who are east of GMT and who make their clock
4895 * tick in localtime for Windows bug-for-bug compatibility,
4896 * the clock is set in the future, and this will cause e2fsck
4897 * to complain and force a full file system check.
4898 */
1751e8a6 4899 if (!(sb->s_flags & SB_RDONLY))
6a0678a7 4900 ext4_update_tstamp(es, s_wtime);
f613dfcb
TT		 4901 if (sb->s_bdev->bd_part)
4902 es->s_kbytes_written =
4903 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written +
dbae2c55
MC		 4904 ((part_stat_read(sb->s_bdev->bd_part,
4905 sectors[STAT_WRITE]) -
afc32f7e 4906 EXT4_SB(sb)->s_sectors_written_start) >> 1));
f613dfcb
TT		 4907 else
4908 es->s_kbytes_written =
4909 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written);
d5e03cbb
TT		 4910 if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeclusters_counter))
4911 ext4_free_blocks_count_set(es,
57042651
TT		 4912 EXT4_C2B(EXT4_SB(sb), percpu_counter_sum_positive(
4913 &EXT4_SB(sb)->s_freeclusters_counter)));
d5e03cbb
TT		 4914 if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeinodes_counter))
4915 es->s_free_inodes_count =
4916 cpu_to_le32(percpu_counter_sum_positive(
ce7e010a 4917 &EXT4_SB(sb)->s_freeinodes_counter));
ac27a0ec 4918 BUFFER_TRACE(sbh, "marking dirty");
06db49e6 4919 ext4_superblock_csum_set(sb);
1566a48a
TT		 4920 if (sync)
4921 lock_buffer(sbh);
e8680786 4922 if (buffer_write_io_error(sbh) || !buffer_uptodate(sbh)) {
4743f839
PKS		 4923 /*
4924 * Oh, dear. A previous attempt to write the
4925 * superblock failed. This could happen because the
4926 * USB device was yanked out. Or it could happen to
4927 * be a transient write error and maybe the block will
4928 * be remapped. Nothing we can do but to retry the
4929 * write and hope for the best.
4930 */
4931 ext4_msg(sb, KERN_ERR, "previous I/O error to "
4932 "superblock detected");
4933 clear_buffer_write_io_error(sbh);
4934 set_buffer_uptodate(sbh);
4935 }
ac27a0ec 4936 mark_buffer_dirty(sbh);
914258bf 4937 if (sync) {
1566a48a 4938 unlock_buffer(sbh);
564bc402 4939 error = __sync_dirty_buffer(sbh,
00473374 4940 REQ_SYNC | (test_opt(sb, BARRIER) ? REQ_FUA : 0));
c89128a0 4941 if (buffer_write_io_error(sbh)) {
b31e1552
ES		 4942 ext4_msg(sb, KERN_ERR, "I/O error while writing "
4943 "superblock");
914258bf
TT		 4944 clear_buffer_write_io_error(sbh);
4945 set_buffer_uptodate(sbh);
4946 }
4947 }
c4be0c1d 4948 return error;
ac27a0ec
DK		 4949}
4950
ac27a0ec
DK		 4951/*
4952 * Have we just finished recovery? If so, and if we are mounting (or
4953 * remounting) the filesystem readonly, then we will end up with a
4954 * consistent fs on disk. Record that fact.
4955 */
2b2d6d01
TT		 4956static void ext4_mark_recovery_complete(struct super_block *sb,
4957 struct ext4_super_block *es)
ac27a0ec 4958{
617ba13b 4959 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 4960
e2b911c5 4961 if (!ext4_has_feature_journal(sb)) {
0390131b
FM		 4962 BUG_ON(journal != NULL);
4963 return;
4964 }
dab291af 4965 jbd2_journal_lock_updates(journal);
7ffe1ea8
HK		 4966 if (jbd2_journal_flush(journal) < 0)
4967 goto out;
4968
bc98a42c 4969 if (ext4_has_feature_journal_needs_recovery(sb) && sb_rdonly(sb)) {
e2b911c5 4970 ext4_clear_feature_journal_needs_recovery(sb);
e2d67052 4971 ext4_commit_super(sb, 1);
ac27a0ec 4972 }
7ffe1ea8
HK		 4973
4974out:
dab291af 4975 jbd2_journal_unlock_updates(journal);
ac27a0ec
DK		 4976}
4977
4978/*
4979 * If we are mounting (or read-write remounting) a filesystem whose journal
4980 * has recorded an error from a previous lifetime, move that error to the
4981 * main filesystem now.
4982 */
2b2d6d01
TT		 4983static void ext4_clear_journal_err(struct super_block *sb,
4984 struct ext4_super_block *es)
ac27a0ec
DK		 4985{
4986 journal_t *journal;
4987 int j_errno;
4988 const char *errstr;
4989
e2b911c5 4990 BUG_ON(!ext4_has_feature_journal(sb));
0390131b 4991
617ba13b 4992 journal = EXT4_SB(sb)->s_journal;
ac27a0ec
DK		 4993
4994 /*
4995 * Now check for any error status which may have been recorded in the
617ba13b 4996 * journal by a prior ext4_error() or ext4_abort()
ac27a0ec
DK		 4997 */
4998
dab291af 4999 j_errno = jbd2_journal_errno(journal);
ac27a0ec
DK		 5000 if (j_errno) {
5001 char nbuf[16];
5002
617ba13b 5003 errstr = ext4_decode_error(sb, j_errno, nbuf);
12062ddd 5004 ext4_warning(sb, "Filesystem error recorded "
ac27a0ec 5005 "from previous mount: %s", errstr);
12062ddd 5006 ext4_warning(sb, "Marking fs in need of filesystem check.");
ac27a0ec 5007
617ba13b
MC		 5008 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
5009 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
e2d67052 5010 ext4_commit_super(sb, 1);
ac27a0ec 5011
dab291af 5012 jbd2_journal_clear_err(journal);
d796c52e 5013 jbd2_journal_update_sb_errno(journal);
ac27a0ec
DK		 5014 }
5015}
5016
5017/*
5018 * Force the running and committing transactions to commit,
5019 * and wait on the commit.
5020 */
617ba13b 5021int ext4_force_commit(struct super_block *sb)
ac27a0ec
DK		 5022{
5023 journal_t *journal;
ac27a0ec 5024
bc98a42c 5025 if (sb_rdonly(sb))
ac27a0ec
DK		 5026 return 0;
5027
617ba13b 5028 journal = EXT4_SB(sb)->s_journal;
b1deefc9 5029 return ext4_journal_force_commit(journal);
ac27a0ec
DK		 5030}
5031
617ba13b 5032static int ext4_sync_fs(struct super_block *sb, int wait)
ac27a0ec 5033{
14ce0cb4 5034 int ret = 0;
9eddacf9 5035 tid_t target;
06a407f1 5036 bool needs_barrier = false;
8d5d02e6 5037 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 5038
49598e04 5039 if (unlikely(ext4_forced_shutdown(sbi)))
0db1ff22
TT		 5040 return 0;
5041
9bffad1e 5042 trace_ext4_sync_fs(sb, wait);
2e8fa54e 5043 flush_workqueue(sbi->rsv_conversion_wq);
a1177825
JK		 5044 /*
5045 * Writeback quota in non-journalled quota case - journalled quota has
5046 * no dirty dquots
5047 */
5048 dquot_writeback_dquots(sb, -1);
06a407f1
DM		 5049 /*
5050 * Data writeback is possible w/o journal transaction, so barrier must
5051 * being sent at the end of the function. But we can skip it if
5052 * transaction_commit will do it for us.
5053 */
bda32530
TT		 5054 if (sbi->s_journal) {
5055 target = jbd2_get_latest_transaction(sbi->s_journal);
5056 if (wait && sbi->s_journal->j_flags & JBD2_BARRIER &&
5057 !jbd2_trans_will_send_data_barrier(sbi->s_journal, target))
5058 needs_barrier = true;
5059
5060 if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
5061 if (wait)
5062 ret = jbd2_log_wait_commit(sbi->s_journal,
5063 target);
5064 }
5065 } else if (wait && test_opt(sb, BARRIER))
06a407f1 5066 needs_barrier = true;
06a407f1
DM		 5067 if (needs_barrier) {
5068 int err;
5069 err = blkdev_issue_flush(sb->s_bdev, GFP_KERNEL, NULL);
5070 if (!ret)
5071 ret = err;
0390131b 5072 }
06a407f1
DM		 5073
5074 return ret;
5075}
5076
ac27a0ec
DK		 5077/*
5078 * LVM calls this function before a (read-only) snapshot is created. This
5079 * gives us a chance to flush the journal completely and mark the fs clean.
be4f27d3
YY		 5080 *
5081 * Note that only this function cannot bring a filesystem to be in a clean
8e8ad8a5
JK		 5082 * state independently. It relies on upper layer to stop all data & metadata
5083 * modifications.
ac27a0ec 5084 */
c4be0c1d 5085static int ext4_freeze(struct super_block *sb)
ac27a0ec 5086{
c4be0c1d
TS		 5087 int error = 0;
5088 journal_t *journal;
ac27a0ec 5089
bc98a42c 5090 if (sb_rdonly(sb))
9ca92389 5091 return 0;
ac27a0ec 5092
9ca92389 5093 journal = EXT4_SB(sb)->s_journal;
7ffe1ea8 5094
bb044576
TT		 5095 if (journal) {
5096 /* Now we set up the journal barrier. */
5097 jbd2_journal_lock_updates(journal);
ac27a0ec 5098
bb044576
TT		 5099 /*
5100 * Don't clear the needs_recovery flag if we failed to
5101 * flush the journal.
5102 */
5103 error = jbd2_journal_flush(journal);
5104 if (error < 0)
5105 goto out;
c642dc9e
ES		 5106
5107 /* Journal blocked and flushed, clear needs_recovery flag. */
e2b911c5 5108 ext4_clear_feature_journal_needs_recovery(sb);
bb044576 5109 }
9ca92389 5110
9ca92389 5111 error = ext4_commit_super(sb, 1);
6b0310fb 5112out:
bb044576
TT		 5113 if (journal)
5114 /* we rely on upper layer to stop further updates */
5115 jbd2_journal_unlock_updates(journal);
6b0310fb 5116 return error;
ac27a0ec
DK		 5117}
5118
5119/*
5120 * Called by LVM after the snapshot is done. We need to reset the RECOVER
5121 * flag here, even though the filesystem is not technically dirty yet.
5122 */
c4be0c1d 5123static int ext4_unfreeze(struct super_block *sb)
ac27a0ec 5124{
bc98a42c 5125 if (sb_rdonly(sb) || ext4_forced_shutdown(EXT4_SB(sb)))
9ca92389
TT		 5126 return 0;
5127
c642dc9e
ES		 5128 if (EXT4_SB(sb)->s_journal) {
5129 /* Reset the needs_recovery flag before the fs is unlocked. */
e2b911c5 5130 ext4_set_feature_journal_needs_recovery(sb);
c642dc9e
ES		 5131 }
5132
9ca92389 5133 ext4_commit_super(sb, 1);
c4be0c1d 5134 return 0;
ac27a0ec
DK		 5135}
5136
673c6100
TT		 5137/*
5138 * Structure to save mount options for ext4_remount's benefit
5139 */
5140struct ext4_mount_options {
5141 unsigned long s_mount_opt;
a2595b8a 5142 unsigned long s_mount_opt2;
08cefc7a
EB		 5143 kuid_t s_resuid;
5144 kgid_t s_resgid;
673c6100
TT		 5145 unsigned long s_commit_interval;
5146 u32 s_min_batch_time, s_max_batch_time;
5147#ifdef CONFIG_QUOTA
5148 int s_jquota_fmt;
a2d4a646 5149 char *s_qf_names[EXT4_MAXQUOTAS];
673c6100
TT		 5150#endif
5151};
5152
2b2d6d01 5153static int ext4_remount(struct super_block *sb, int *flags, char *data)
ac27a0ec 5154{
2b2d6d01 5155 struct ext4_super_block *es;
617ba13b 5156 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 5157 unsigned long old_sb_flags;
617ba13b 5158 struct ext4_mount_options old_opts;
c79d967d 5159 int enable_quota = 0;
8a266467 5160 ext4_group_t g;
b3881f74 5161 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
c5e06d10 5162 int err = 0;
ac27a0ec 5163#ifdef CONFIG_QUOTA
03dafb5f 5164 int i, j;
33458eab 5165 char *to_free[EXT4_MAXQUOTAS];
ac27a0ec 5166#endif
d4c402d9 5167 char *orig_data = kstrdup(data, GFP_KERNEL);
ac27a0ec 5168
21ac738e
CX		 5169 if (data && !orig_data)
5170 return -ENOMEM;
5171
ac27a0ec
DK		 5172 /* Store the original options */
5173 old_sb_flags = sb->s_flags;
5174 old_opts.s_mount_opt = sbi->s_mount_opt;
a2595b8a 5175 old_opts.s_mount_opt2 = sbi->s_mount_opt2;
ac27a0ec
DK		 5176 old_opts.s_resuid = sbi->s_resuid;
5177 old_opts.s_resgid = sbi->s_resgid;
5178 old_opts.s_commit_interval = sbi->s_commit_interval;
30773840
TT		 5179 old_opts.s_min_batch_time = sbi->s_min_batch_time;
5180 old_opts.s_max_batch_time = sbi->s_max_batch_time;
ac27a0ec
DK		 5181#ifdef CONFIG_QUOTA
5182 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
a2d4a646 5183 for (i = 0; i < EXT4_MAXQUOTAS; i++)
03dafb5f 5184 if (sbi->s_qf_names[i]) {
33458eab
TT		 5185 char *qf_name = get_qf_name(sb, sbi, i);
5186
5187 old_opts.s_qf_names[i] = kstrdup(qf_name, GFP_KERNEL);
03dafb5f
CG		 5188 if (!old_opts.s_qf_names[i]) {
5189 for (j = 0; j < i; j++)
5190 kfree(old_opts.s_qf_names[j]);
3e36a163 5191 kfree(orig_data);
03dafb5f
CG		 5192 return -ENOMEM;
5193 }
5194 } else
5195 old_opts.s_qf_names[i] = NULL;
ac27a0ec 5196#endif
b3881f74
TT		 5197 if (sbi->s_journal && sbi->s_journal->j_task->io_context)
5198 journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
ac27a0ec 5199
661aa520 5200 if (!parse_options(data, sb, NULL, &journal_ioprio, 1)) {
ac27a0ec
DK		 5201 err = -EINVAL;
5202 goto restore_opts;
5203 }
5204
7bc04c5c
BR		 5205 ext4_clamp_want_extra_isize(sb);
5206
6b992ff2 5207 if ((old_opts.s_mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) ^
c6d3d56d
DW		 5208 test_opt(sb, JOURNAL_CHECKSUM)) {
5209 ext4_msg(sb, KERN_ERR, "changing journal_checksum "
2d5b86e0
ES		 5210 "during remount not supported; ignoring");
5211 sbi->s_mount_opt ^= EXT4_MOUNT_JOURNAL_CHECKSUM;
6b992ff2
DW		 5212 }
5213
6ae6514b
PS		 5214 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
5215 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
5216 ext4_msg(sb, KERN_ERR, "can't mount with "
5217 "both data=journal and delalloc");
5218 err = -EINVAL;
5219 goto restore_opts;
5220 }
5221 if (test_opt(sb, DIOREAD_NOLOCK)) {
5222 ext4_msg(sb, KERN_ERR, "can't mount with "
5223 "both data=journal and dioread_nolock");
5224 err = -EINVAL;
5225 goto restore_opts;
5226 }
923ae0ff
RZ		 5227 if (test_opt(sb, DAX)) {
5228 ext4_msg(sb, KERN_ERR, "can't mount with "
5229 "both data=journal and dax");
5230 err = -EINVAL;
5231 goto restore_opts;
5232 }
ab04df78
JK		 5233 } else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) {
5234 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
5235 ext4_msg(sb, KERN_ERR, "can't mount with "
5236 "journal_async_commit in data=ordered mode");
5237 err = -EINVAL;
5238 goto restore_opts;
5239 }
923ae0ff
RZ		 5240 }
5241
cdb7ee4c
TE		 5242 if ((sbi->s_mount_opt ^ old_opts.s_mount_opt) & EXT4_MOUNT_NO_MBCACHE) {
5243 ext4_msg(sb, KERN_ERR, "can't enable nombcache during remount");
5244 err = -EINVAL;
5245 goto restore_opts;
5246 }
5247
923ae0ff
RZ		 5248 if ((sbi->s_mount_opt ^ old_opts.s_mount_opt) & EXT4_MOUNT_DAX) {
5249 ext4_msg(sb, KERN_WARNING, "warning: refusing change of "
5250 "dax flag with busy inodes while remounting");
5251 sbi->s_mount_opt ^= EXT4_MOUNT_DAX;
6ae6514b
PS		 5252 }
5253
4ab2f15b 5254 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
c67d859e 5255 ext4_abort(sb, "Abort forced by user");
ac27a0ec 5256
1751e8a6
LT		 5257 sb->s_flags = (sb->s_flags & ~SB_POSIXACL) |
5258 (test_opt(sb, POSIX_ACL) ? SB_POSIXACL : 0);
ac27a0ec
DK		 5259
5260 es = sbi->s_es;
5261
b3881f74 5262 if (sbi->s_journal) {
0390131b 5263 ext4_init_journal_params(sb, sbi->s_journal);
b3881f74
TT		 5264 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
5265 }
ac27a0ec 5266
1751e8a6
LT		 5267 if (*flags & SB_LAZYTIME)
5268 sb->s_flags |= SB_LAZYTIME;
a2fd66d0 5269
1751e8a6 5270 if ((bool)(*flags & SB_RDONLY) != sb_rdonly(sb)) {
4ab2f15b 5271 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) {
ac27a0ec
DK		 5272 err = -EROFS;
5273 goto restore_opts;
5274 }
5275
1751e8a6 5276 if (*flags & SB_RDONLY) {
38c03b34
TT		 5277 err = sync_filesystem(sb);
5278 if (err < 0)
5279 goto restore_opts;
0f0dd62f
CH		 5280 err = dquot_suspend(sb, -1);
5281 if (err < 0)
c79d967d 5282 goto restore_opts;
c79d967d 5283
ac27a0ec
DK		 5284 /*
5285 * First of all, the unconditional stuff we have to do
5286 * to disable replay of the journal when we next remount
5287 */
1751e8a6 5288 sb->s_flags |= SB_RDONLY;
ac27a0ec
DK		 5289
5290 /*
5291 * OK, test if we are remounting a valid rw partition
5292 * readonly, and if so set the rdonly flag and then
5293 * mark the partition as valid again.
5294 */
617ba13b
MC		 5295 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
5296 (sbi->s_mount_state & EXT4_VALID_FS))
ac27a0ec
DK		 5297 es->s_state = cpu_to_le16(sbi->s_mount_state);
5298
a63c9eb2 5299 if (sbi->s_journal)
0390131b 5300 ext4_mark_recovery_complete(sb, es);
2dca60d9
TT		 5301 if (sbi->s_mmp_tsk)
5302 kthread_stop(sbi->s_mmp_tsk);
ac27a0ec 5303 } else {
a13fb1a4 5304 /* Make sure we can mount this feature set readwrite */
e2b911c5 5305 if (ext4_has_feature_readonly(sb) ||
2cb5cc8b 5306 !ext4_feature_set_ok(sb, 0)) {
ac27a0ec
DK		 5307 err = -EROFS;
5308 goto restore_opts;
5309 }
8a266467
TT		 5310 /*
5311 * Make sure the group descriptor checksums
0b8e58a1 5312 * are sane. If they aren't, refuse to remount r/w.
8a266467
TT		 5313 */
5314 for (g = 0; g < sbi->s_groups_count; g++) {
5315 struct ext4_group_desc *gdp =
5316 ext4_get_group_desc(sb, g, NULL);
5317
feb0ab32 5318 if (!ext4_group_desc_csum_verify(sb, g, gdp)) {
b31e1552
ES		 5319 ext4_msg(sb, KERN_ERR,
5320 "ext4_remount: Checksum for group %u failed (%u!=%u)",
e2b911c5 5321 g, le16_to_cpu(ext4_group_desc_csum(sb, g, gdp)),
8a266467 5322 le16_to_cpu(gdp->bg_checksum));
6a797d27 5323 err = -EFSBADCRC;
8a266467
TT		 5324 goto restore_opts;
5325 }
5326 }
5327
ead6596b
ES		 5328 /*
5329 * If we have an unprocessed orphan list hanging
5330 * around from a previously readonly bdev mount,
5331 * require a full umount/remount for now.
5332 */
5333 if (es->s_last_orphan) {
b31e1552 5334 ext4_msg(sb, KERN_WARNING, "Couldn't "
ead6596b
ES		 5335 "remount RDWR because of unprocessed "
5336 "orphan inode list. Please "
b31e1552 5337 "umount/remount instead");
ead6596b
ES		 5338 err = -EINVAL;
5339 goto restore_opts;
5340 }
5341
ac27a0ec
DK		 5342 /*
5343 * Mounting a RDONLY partition read-write, so reread
5344 * and store the current valid flag. (It may have
5345 * been changed by e2fsck since we originally mounted
5346 * the partition.)
5347 */
0390131b
FM		 5348 if (sbi->s_journal)
5349 ext4_clear_journal_err(sb, es);
ac27a0ec 5350 sbi->s_mount_state = le16_to_cpu(es->s_state);
c89128a0
JK		 5351
5352 err = ext4_setup_super(sb, es, 0);
5353 if (err)
5354 goto restore_opts;
5355
5356 sb->s_flags &= ~SB_RDONLY;
e2b911c5 5357 if (ext4_has_feature_mmp(sb))
c5e06d10
JL		 5358 if (ext4_multi_mount_protect(sb,
5359 le64_to_cpu(es->s_mmp_block))) {
5360 err = -EROFS;
5361 goto restore_opts;
5362 }
c79d967d 5363 enable_quota = 1;
ac27a0ec
DK		 5364 }
5365 }
bfff6873
LC		 5366
5367 /*
5368 * Reinitialize lazy itable initialization thread based on
5369 * current settings
5370 */
bc98a42c 5371 if (sb_rdonly(sb) || !test_opt(sb, INIT_INODE_TABLE))
bfff6873
LC		 5372 ext4_unregister_li_request(sb);
5373 else {
5374 ext4_group_t first_not_zeroed;
5375 first_not_zeroed = ext4_has_uninit_itable(sb);
5376 ext4_register_li_request(sb, first_not_zeroed);
5377 }
5378
6fd058f7 5379 ext4_setup_system_zone(sb);
c89128a0
JK		 5380 if (sbi->s_journal == NULL && !(old_sb_flags & SB_RDONLY)) {
5381 err = ext4_commit_super(sb, 1);
5382 if (err)
5383 goto restore_opts;
5384 }
0390131b 5385
ac27a0ec
DK		 5386#ifdef CONFIG_QUOTA
5387 /* Release old quota file names */
a2d4a646 5388 for (i = 0; i < EXT4_MAXQUOTAS; i++)
03dafb5f 5389 kfree(old_opts.s_qf_names[i]);
7c319d32
AK		 5390 if (enable_quota) {
5391 if (sb_any_quota_suspended(sb))
5392 dquot_resume(sb, -1);
e2b911c5 5393 else if (ext4_has_feature_quota(sb)) {
7c319d32 5394 err = ext4_enable_quotas(sb);
07724f98 5395 if (err)
7c319d32 5396 goto restore_opts;
7c319d32
AK		 5397 }
5398 }
ac27a0ec 5399#endif
d4c402d9 5400
1751e8a6 5401 *flags = (*flags & ~SB_LAZYTIME) | (sb->s_flags & SB_LAZYTIME);
d4c402d9
CW		 5402 ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s", orig_data);
5403 kfree(orig_data);
ac27a0ec 5404 return 0;
0b8e58a1 5405
ac27a0ec
DK		 5406restore_opts:
5407 sb->s_flags = old_sb_flags;
5408 sbi->s_mount_opt = old_opts.s_mount_opt;
a2595b8a 5409 sbi->s_mount_opt2 = old_opts.s_mount_opt2;
ac27a0ec
DK		 5410 sbi->s_resuid = old_opts.s_resuid;
5411 sbi->s_resgid = old_opts.s_resgid;
5412 sbi->s_commit_interval = old_opts.s_commit_interval;
30773840
TT		 5413 sbi->s_min_batch_time = old_opts.s_min_batch_time;
5414 sbi->s_max_batch_time = old_opts.s_max_batch_time;
ac27a0ec
DK		 5415#ifdef CONFIG_QUOTA
5416 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
a2d4a646 5417 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
33458eab
TT		 5418 to_free[i] = get_qf_name(sb, sbi, i);
5419 rcu_assign_pointer(sbi->s_qf_names[i], old_opts.s_qf_names[i]);
ac27a0ec 5420 }
33458eab
TT		 5421 synchronize_rcu();
5422 for (i = 0; i < EXT4_MAXQUOTAS; i++)
5423 kfree(to_free[i]);
ac27a0ec 5424#endif
d4c402d9 5425 kfree(orig_data);
ac27a0ec
DK		 5426 return err;
5427}
5428
689c958c
LX		 5429#ifdef CONFIG_QUOTA
5430static int ext4_statfs_project(struct super_block *sb,
5431 kprojid_t projid, struct kstatfs *buf)
5432{
5433 struct kqid qid;
5434 struct dquot *dquot;
5435 u64 limit;
5436 u64 curblock;
5437
5438 qid = make_kqid_projid(projid);
5439 dquot = dqget(sb, qid);
5440 if (IS_ERR(dquot))
5441 return PTR_ERR(dquot);
7b9ca4c6 5442 spin_lock(&dquot->dq_dqb_lock);
689c958c
LX		 5443
5444 limit = (dquot->dq_dqb.dqb_bsoftlimit ?
5445 dquot->dq_dqb.dqb_bsoftlimit :
5446 dquot->dq_dqb.dqb_bhardlimit) >> sb->s_blocksize_bits;
5447 if (limit && buf->f_blocks > limit) {
f06925c7
KK		 5448 curblock = (dquot->dq_dqb.dqb_curspace +
5449 dquot->dq_dqb.dqb_rsvspace) >> sb->s_blocksize_bits;
689c958c
LX		 5450 buf->f_blocks = limit;
5451 buf->f_bfree = buf->f_bavail =
5452 (buf->f_blocks > curblock) ?
5453 (buf->f_blocks - curblock) : 0;
5454 }
5455
5456 limit = dquot->dq_dqb.dqb_isoftlimit ?
5457 dquot->dq_dqb.dqb_isoftlimit :
5458 dquot->dq_dqb.dqb_ihardlimit;
5459 if (limit && buf->f_files > limit) {
5460 buf->f_files = limit;
5461 buf->f_ffree =
5462 (buf->f_files > dquot->dq_dqb.dqb_curinodes) ?
5463 (buf->f_files - dquot->dq_dqb.dqb_curinodes) : 0;
5464 }
5465
7b9ca4c6 5466 spin_unlock(&dquot->dq_dqb_lock);
689c958c
LX		 5467 dqput(dquot);
5468 return 0;
5469}
5470#endif
5471
2b2d6d01 5472static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
ac27a0ec
DK		 5473{
5474 struct super_block *sb = dentry->d_sb;
617ba13b
MC		 5475 struct ext4_sb_info *sbi = EXT4_SB(sb);
5476 struct ext4_super_block *es = sbi->s_es;
27dd4385 5477 ext4_fsblk_t overhead = 0, resv_blocks;
960cc398 5478 u64 fsid;
d02a9391 5479 s64 bfree;
27dd4385 5480 resv_blocks = EXT4_C2B(sbi, atomic64_read(&sbi->s_resv_clusters));
ac27a0ec 5481
952fc18e
TT		 5482 if (!test_opt(sb, MINIX_DF))
5483 overhead = sbi->s_overhead;
ac27a0ec 5484
617ba13b 5485 buf->f_type = EXT4_SUPER_MAGIC;
ac27a0ec 5486 buf->f_bsize = sb->s_blocksize;
b72f78cb 5487 buf->f_blocks = ext4_blocks_count(es) - EXT4_C2B(sbi, overhead);
57042651
TT		 5488 bfree = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) -
5489 percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter);
d02a9391 5490 /* prevent underflow in case that few free space is available */
57042651 5491 buf->f_bfree = EXT4_C2B(sbi, max_t(s64, bfree, 0));
27dd4385
LC		 5492 buf->f_bavail = buf->f_bfree -
5493 (ext4_r_blocks_count(es) + resv_blocks);
5494 if (buf->f_bfree < (ext4_r_blocks_count(es) + resv_blocks))
ac27a0ec
DK		 5495 buf->f_bavail = 0;
5496 buf->f_files = le32_to_cpu(es->s_inodes_count);
52d9f3b4 5497 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
617ba13b 5498 buf->f_namelen = EXT4_NAME_LEN;
960cc398
PE		 5499 fsid = le64_to_cpup((void *)es->s_uuid) ^
5500 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
5501 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
5502 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
0b8e58a1 5503
689c958c
LX		 5504#ifdef CONFIG_QUOTA
5505 if (ext4_test_inode_flag(dentry->d_inode, EXT4_INODE_PROJINHERIT) &&
5506 sb_has_quota_limits_enabled(sb, PRJQUOTA))
5507 ext4_statfs_project(sb, EXT4_I(dentry->d_inode)->i_projid, buf);
5508#endif
ac27a0ec
DK		 5509 return 0;
5510}
5511
ac27a0ec
DK		 5512
5513#ifdef CONFIG_QUOTA
5514
bc8230ee
JK		 5515/*
5516 * Helper functions so that transaction is started before we acquire dqio_sem
5517 * to keep correct lock ordering of transaction > dqio_sem
5518 */
ac27a0ec
DK		 5519static inline struct inode *dquot_to_inode(struct dquot *dquot)
5520{
4c376dca 5521 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_id.type];
ac27a0ec
DK		 5522}
5523
617ba13b 5524static int ext4_write_dquot(struct dquot *dquot)
ac27a0ec
DK		 5525{
5526 int ret, err;
5527 handle_t *handle;
5528 struct inode *inode;
5529
5530 inode = dquot_to_inode(dquot);
9924a92a 5531 handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
0b8e58a1 5532 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 5533 if (IS_ERR(handle))
5534 return PTR_ERR(handle);
5535 ret = dquot_commit(dquot);
617ba13b 5536 err = ext4_journal_stop(handle);
ac27a0ec
DK		 5537 if (!ret)
5538 ret = err;
5539 return ret;
5540}
5541
617ba13b 5542static int ext4_acquire_dquot(struct dquot *dquot)
ac27a0ec
DK		 5543{
5544 int ret, err;
5545 handle_t *handle;
5546
9924a92a 5547 handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
0b8e58a1 5548 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 5549 if (IS_ERR(handle))
5550 return PTR_ERR(handle);
5551 ret = dquot_acquire(dquot);
617ba13b 5552 err = ext4_journal_stop(handle);
ac27a0ec
DK		 5553 if (!ret)
5554 ret = err;
5555 return ret;
5556}
5557
617ba13b 5558static int ext4_release_dquot(struct dquot *dquot)
ac27a0ec
DK		 5559{
5560 int ret, err;
5561 handle_t *handle;
5562
9924a92a 5563 handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
0b8e58a1 5564 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
9c3013e9
JK		 5565 if (IS_ERR(handle)) {
5566 /* Release dquot anyway to avoid endless cycle in dqput() */
5567 dquot_release(dquot);
ac27a0ec 5568 return PTR_ERR(handle);
9c3013e9 5569 }
ac27a0ec 5570 ret = dquot_release(dquot);
617ba13b 5571 err = ext4_journal_stop(handle);
ac27a0ec
DK		 5572 if (!ret)
5573 ret = err;
5574 return ret;
5575}
5576
617ba13b 5577static int ext4_mark_dquot_dirty(struct dquot *dquot)
ac27a0ec 5578{
262b4662
JK		 5579 struct super_block *sb = dquot->dq_sb;
5580 struct ext4_sb_info *sbi = EXT4_SB(sb);
5581
2c8be6b2 5582 /* Are we journaling quotas? */
e2b911c5 5583 if (ext4_has_feature_quota(sb) ||
262b4662 5584 sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
ac27a0ec 5585 dquot_mark_dquot_dirty(dquot);
617ba13b 5586 return ext4_write_dquot(dquot);
ac27a0ec
DK		 5587 } else {
5588 return dquot_mark_dquot_dirty(dquot);
5589 }
5590}
5591
617ba13b 5592static int ext4_write_info(struct super_block *sb, int type)
ac27a0ec
DK		 5593{
5594 int ret, err;
5595 handle_t *handle;
5596
5597 /* Data block + inode block */
2b0143b5 5598 handle = ext4_journal_start(d_inode(sb->s_root), EXT4_HT_QUOTA, 2);
ac27a0ec
DK		 5599 if (IS_ERR(handle))
5600 return PTR_ERR(handle);
5601 ret = dquot_commit_info(sb, type);
617ba13b 5602 err = ext4_journal_stop(handle);
ac27a0ec
DK		 5603 if (!ret)
5604 ret = err;
5605 return ret;
5606}
5607
5608/*
5609 * Turn on quotas during mount time - we need to find
5610 * the quota file and such...
5611 */
617ba13b 5612static int ext4_quota_on_mount(struct super_block *sb, int type)
ac27a0ec 5613{
33458eab 5614 return dquot_quota_on_mount(sb, get_qf_name(sb, EXT4_SB(sb), type),
287a8095 5615 EXT4_SB(sb)->s_jquota_fmt, type);
ac27a0ec
DK		 5616}
5617
daf647d2
TT		 5618static void lockdep_set_quota_inode(struct inode *inode, int subclass)
5619{
5620 struct ext4_inode_info *ei = EXT4_I(inode);
5621
5622 /* The first argument of lockdep_set_subclass has to be
5623 * *exactly* the same as the argument to init_rwsem() --- in
5624 * this case, in init_once() --- or lockdep gets unhappy
5625 * because the name of the lock is set using the
5626 * stringification of the argument to init_rwsem().
5627 */
5628 (void) ei; /* shut up clang warning if !CONFIG_LOCKDEP */
5629 lockdep_set_subclass(&ei->i_data_sem, subclass);
5630}
5631
ac27a0ec
DK		 5632/*
5633 * Standard function to be called on quota_on
5634 */
617ba13b 5635static int ext4_quota_on(struct super_block *sb, int type, int format_id,
8c54ca9c 5636 const struct path *path)
ac27a0ec
DK		 5637{
5638 int err;
ac27a0ec
DK		 5639
5640 if (!test_opt(sb, QUOTA))
5641 return -EINVAL;
0623543b 5642
ac27a0ec 5643 /* Quotafile not on the same filesystem? */
d8c9584e 5644 if (path->dentry->d_sb != sb)
ac27a0ec 5645 return -EXDEV;
0623543b
JK		 5646 /* Journaling quota? */
5647 if (EXT4_SB(sb)->s_qf_names[type]) {
2b2d6d01 5648 /* Quotafile not in fs root? */
f00c9e44 5649 if (path->dentry->d_parent != sb->s_root)
b31e1552
ES		 5650 ext4_msg(sb, KERN_WARNING,
5651 "Quota file not on filesystem root. "
5652 "Journaled quota will not work");
91389240
JK		 5653 sb_dqopt(sb)->flags |= DQUOT_NOLIST_DIRTY;
5654 } else {
5655 /*
5656 * Clear the flag just in case mount options changed since
5657 * last time.
5658 */
5659 sb_dqopt(sb)->flags &= ~DQUOT_NOLIST_DIRTY;
2b2d6d01 5660 }
0623543b
JK		 5661
5662 /*
5663 * When we journal data on quota file, we have to flush journal to see
5664 * all updates to the file when we bypass pagecache...
5665 */
0390131b 5666 if (EXT4_SB(sb)->s_journal &&
2b0143b5 5667 ext4_should_journal_data(d_inode(path->dentry))) {
0623543b
JK		 5668 /*
5669 * We don't need to lock updates but journal_flush() could
5670 * otherwise be livelocked...
5671 */
5672 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
7ffe1ea8 5673 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
0623543b 5674 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
f00c9e44 5675 if (err)
7ffe1ea8 5676 return err;
0623543b 5677 }
957153fc 5678
daf647d2
TT		 5679 lockdep_set_quota_inode(path->dentry->d_inode, I_DATA_SEM_QUOTA);
5680 err = dquot_quota_on(sb, type, format_id, path);
957153fc 5681 if (err) {
daf647d2
TT		 5682 lockdep_set_quota_inode(path->dentry->d_inode,
5683 I_DATA_SEM_NORMAL);
957153fc
JK		 5684 } else {
5685 struct inode *inode = d_inode(path->dentry);
5686 handle_t *handle;
5687
61a92987
JK		 5688 /*
5689 * Set inode flags to prevent userspace from messing with quota
5690 * files. If this fails, we return success anyway since quotas
5691 * are already enabled and this is not a hard failure.
5692 */
957153fc
JK		 5693 inode_lock(inode);
5694 handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1);
5695 if (IS_ERR(handle))
5696 goto unlock_inode;
5697 EXT4_I(inode)->i_flags |= EXT4_NOATIME_FL | EXT4_IMMUTABLE_FL;
5698 inode_set_flags(inode, S_NOATIME | S_IMMUTABLE,
5699 S_NOATIME | S_IMMUTABLE);
5700 ext4_mark_inode_dirty(handle, inode);
5701 ext4_journal_stop(handle);
5702 unlock_inode:
5703 inode_unlock(inode);
5704 }
daf647d2 5705 return err;
ac27a0ec
DK		 5706}
5707
7c319d32
AK		 5708static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
5709 unsigned int flags)
5710{
5711 int err;
5712 struct inode *qf_inode;
a2d4a646 5713 unsigned long qf_inums[EXT4_MAXQUOTAS] = {
7c319d32 5714 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
689c958c
LX		 5715 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum),
5716 le32_to_cpu(EXT4_SB(sb)->s_es->s_prj_quota_inum)
7c319d32
AK		 5717 };
5718
e2b911c5 5719 BUG_ON(!ext4_has_feature_quota(sb));
7c319d32
AK		 5720
5721 if (!qf_inums[type])
5722 return -EPERM;
5723
8a363970 5724 qf_inode = ext4_iget(sb, qf_inums[type], EXT4_IGET_SPECIAL);
7c319d32
AK		 5725 if (IS_ERR(qf_inode)) {
5726 ext4_error(sb, "Bad quota inode # %lu", qf_inums[type]);
5727 return PTR_ERR(qf_inode);
5728 }
5729
bcb13850
JK		 5730 /* Don't account quota for quota files to avoid recursion */
5731 qf_inode->i_flags |= S_NOQUOTA;
daf647d2 5732 lockdep_set_quota_inode(qf_inode, I_DATA_SEM_QUOTA);
7c319d32 5733 err = dquot_enable(qf_inode, type, format_id, flags);
daf647d2
TT		 5734 if (err)
5735 lockdep_set_quota_inode(qf_inode, I_DATA_SEM_NORMAL);
61157b24 5736 iput(qf_inode);
7c319d32
AK		 5737
5738 return err;
5739}
5740
5741/* Enable usage tracking for all quota types. */
5742static int ext4_enable_quotas(struct super_block *sb)
5743{
5744 int type, err = 0;
a2d4a646 5745 unsigned long qf_inums[EXT4_MAXQUOTAS] = {
7c319d32 5746 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
689c958c
LX		 5747 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum),
5748 le32_to_cpu(EXT4_SB(sb)->s_es->s_prj_quota_inum)
7c319d32 5749 };
49da9392
JK		 5750 bool quota_mopt[EXT4_MAXQUOTAS] = {
5751 test_opt(sb, USRQUOTA),
5752 test_opt(sb, GRPQUOTA),
5753 test_opt(sb, PRJQUOTA),
5754 };
7c319d32 5755
91389240 5756 sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE | DQUOT_NOLIST_DIRTY;
a2d4a646 5757 for (type = 0; type < EXT4_MAXQUOTAS; type++) {
7c319d32
AK		 5758 if (qf_inums[type]) {
5759 err = ext4_quota_enable(sb, type, QFMT_VFS_V1,
49da9392
JK		 5760 DQUOT_USAGE_ENABLED |
5761 (quota_mopt[type] ? DQUOT_LIMITS_ENABLED : 0));
7c319d32
AK		 5762 if (err) {
5763 ext4_warning(sb,
72ba7450
TT		 5764 "Failed to enable quota tracking "
5765 "(type=%d, err=%d). Please run "
5766 "e2fsck to fix.", type, err);
7f144fd0
JU		 5767 for (type--; type >= 0; type--)
5768 dquot_quota_off(sb, type);
5769
7c319d32
AK		 5770 return err;
5771 }
5772 }
5773 }
5774 return 0;
5775}
5776
ca0e05e4
DM		 5777static int ext4_quota_off(struct super_block *sb, int type)
5778{
21f97697
JK		 5779 struct inode *inode = sb_dqopt(sb)->files[type];
5780 handle_t *handle;
957153fc 5781 int err;
21f97697 5782
87009d86
DM		 5783 /* Force all delayed allocation blocks to be allocated.
5784 * Caller already holds s_umount sem */
5785 if (test_opt(sb, DELALLOC))
ca0e05e4 5786 sync_filesystem(sb);
ca0e05e4 5787
957153fc 5788 if (!inode || !igrab(inode))
0b268590
AG		 5789 goto out;
5790
957153fc 5791 err = dquot_quota_off(sb, type);
964edf66 5792 if (err || ext4_has_feature_quota(sb))
957153fc
JK		 5793 goto out_put;
5794
5795 inode_lock(inode);
61a92987
JK		 5796 /*
5797 * Update modification times of quota files when userspace can
5798 * start looking at them. If we fail, we return success anyway since
5799 * this is not a hard failure and quotas are already disabled.
5800 */
9924a92a 5801 handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1);
21f97697 5802 if (IS_ERR(handle))
957153fc
JK		 5803 goto out_unlock;
5804 EXT4_I(inode)->i_flags &= ~(EXT4_NOATIME_FL | EXT4_IMMUTABLE_FL);
5805 inode_set_flags(inode, 0, S_NOATIME | S_IMMUTABLE);
eeca7ea1 5806 inode->i_mtime = inode->i_ctime = current_time(inode);
21f97697
JK		 5807 ext4_mark_inode_dirty(handle, inode);
5808 ext4_journal_stop(handle);
957153fc
JK		 5809out_unlock:
5810 inode_unlock(inode);
5811out_put:
964edf66 5812 lockdep_set_quota_inode(inode, I_DATA_SEM_NORMAL);
957153fc
JK		 5813 iput(inode);
5814 return err;
21f97697 5815out:
ca0e05e4
DM		 5816 return dquot_quota_off(sb, type);
5817}
5818
ac27a0ec
DK		 5819/* Read data from quotafile - avoid pagecache and such because we cannot afford
5820 * acquiring the locks... As quota files are never truncated and quota code
25985edc 5821 * itself serializes the operations (and no one else should touch the files)
ac27a0ec 5822 * we don't have to be afraid of races */
617ba13b 5823static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec
DK		 5824 size_t len, loff_t off)
5825{
5826 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 5827 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 5828 int offset = off & (sb->s_blocksize - 1);
5829 int tocopy;
5830 size_t toread;
5831 struct buffer_head *bh;
5832 loff_t i_size = i_size_read(inode);
5833
5834 if (off > i_size)
5835 return 0;
5836 if (off+len > i_size)
5837 len = i_size-off;
5838 toread = len;
5839 while (toread > 0) {
5840 tocopy = sb->s_blocksize - offset < toread ?
5841 sb->s_blocksize - offset : toread;
1c215028
TT		 5842 bh = ext4_bread(NULL, inode, blk, 0);
5843 if (IS_ERR(bh))
5844 return PTR_ERR(bh);
ac27a0ec
DK		 5845 if (!bh) /* A hole? */
5846 memset(data, 0, tocopy);
5847 else
5848 memcpy(data, bh->b_data+offset, tocopy);
5849 brelse(bh);
5850 offset = 0;
5851 toread -= tocopy;
5852 data += tocopy;
5853 blk++;
5854 }
5855 return len;
5856}
5857
5858/* Write to quotafile (we know the transaction is already started and has
5859 * enough credits) */
617ba13b 5860static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec
DK		 5861 const char *data, size_t len, loff_t off)
5862{
5863 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 5864 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
1c215028 5865 int err, offset = off & (sb->s_blocksize - 1);
c5e298ae 5866 int retries = 0;
ac27a0ec
DK		 5867 struct buffer_head *bh;
5868 handle_t *handle = journal_current_handle();
5869
0390131b 5870 if (EXT4_SB(sb)->s_journal && !handle) {
b31e1552
ES		 5871 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
5872 " cancelled because transaction is not started",
9c3013e9
JK		 5873 (unsigned long long)off, (unsigned long long)len);
5874 return -EIO;
5875 }
67eeb568
DM		 5876 /*
5877 * Since we account only one data block in transaction credits,
5878 * then it is impossible to cross a block boundary.
5879 */
5880 if (sb->s_blocksize - offset < len) {
5881 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
5882 " cancelled because not block aligned",
5883 (unsigned long long)off, (unsigned long long)len);
5884 return -EIO;
5885 }
5886
c5e298ae
TT		 5887 do {
5888 bh = ext4_bread(handle, inode, blk,
5889 EXT4_GET_BLOCKS_CREATE |
5890 EXT4_GET_BLOCKS_METADATA_NOFAIL);
5891 } while (IS_ERR(bh) && (PTR_ERR(bh) == -ENOSPC) &&
5892 ext4_should_retry_alloc(inode->i_sb, &retries));
1c215028
TT		 5893 if (IS_ERR(bh))
5894 return PTR_ERR(bh);
67eeb568
DM		 5895 if (!bh)
5896 goto out;
5d601255 5897 BUFFER_TRACE(bh, "get write access");
62d2b5f2
JK		 5898 err = ext4_journal_get_write_access(handle, bh);
5899 if (err) {
5900 brelse(bh);
1c215028 5901 return err;
ac27a0ec 5902 }
67eeb568
DM		 5903 lock_buffer(bh);
5904 memcpy(bh->b_data+offset, data, len);
5905 flush_dcache_page(bh->b_page);
5906 unlock_buffer(bh);
62d2b5f2 5907 err = ext4_handle_dirty_metadata(handle, NULL, bh);
67eeb568 5908 brelse(bh);
ac27a0ec 5909out:
67eeb568
DM		 5910 if (inode->i_size < off + len) {
5911 i_size_write(inode, off + len);
617ba13b 5912 EXT4_I(inode)->i_disksize = inode->i_size;
21f97697 5913 ext4_mark_inode_dirty(handle, inode);
ac27a0ec 5914 }
67eeb568 5915 return len;
ac27a0ec
DK		 5916}
5917
8f0e8746
TT		 5918static int ext4_get_next_id(struct super_block *sb, struct kqid *qid)
5919{
5920 const struct quota_format_ops *ops;
5921
5922 if (!sb_has_quota_loaded(sb, qid->type))
5923 return -ESRCH;
5924 ops = sb_dqopt(sb)->ops[qid->type];
5925 if (!ops || !ops->get_next_id)
5926 return -ENOSYS;
5927 return dquot_get_next_id(sb, qid);
5928}
ac27a0ec
DK		 5929#endif
5930
152a0836
AV		 5931static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
5932 const char *dev_name, void *data)
ac27a0ec 5933{
152a0836 5934 return mount_bdev(fs_type, flags, dev_name, data, ext4_fill_super);
ac27a0ec
DK		 5935}
5936
c290ea01 5937#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2)
24b58424
TT		 5938static inline void register_as_ext2(void)
5939{
5940 int err = register_filesystem(&ext2_fs_type);
5941 if (err)
5942 printk(KERN_WARNING
5943 "EXT4-fs: Unable to register as ext2 (%d)\n", err);
5944}
5945
5946static inline void unregister_as_ext2(void)
5947{
5948 unregister_filesystem(&ext2_fs_type);
5949}
2035e776
TT		 5950
5951static inline int ext2_feature_set_ok(struct super_block *sb)
5952{
e2b911c5 5953 if (ext4_has_unknown_ext2_incompat_features(sb))
2035e776 5954 return 0;
bc98a42c 5955 if (sb_rdonly(sb))
2035e776 5956 return 1;
e2b911c5 5957 if (ext4_has_unknown_ext2_ro_compat_features(sb))
2035e776
TT		 5958 return 0;
5959 return 1;
5960}
24b58424
TT		 5961#else
5962static inline void register_as_ext2(void) { }
5963static inline void unregister_as_ext2(void) { }
2035e776 5964static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; }
24b58424
TT		 5965#endif
5966
24b58424
TT		 5967static inline void register_as_ext3(void)
5968{
5969 int err = register_filesystem(&ext3_fs_type);
5970 if (err)
5971 printk(KERN_WARNING
5972 "EXT4-fs: Unable to register as ext3 (%d)\n", err);
5973}
5974
5975static inline void unregister_as_ext3(void)
5976{
5977 unregister_filesystem(&ext3_fs_type);
5978}
2035e776
TT		 5979
5980static inline int ext3_feature_set_ok(struct super_block *sb)
5981{
e2b911c5 5982 if (ext4_has_unknown_ext3_incompat_features(sb))
2035e776 5983 return 0;
e2b911c5 5984 if (!ext4_has_feature_journal(sb))
2035e776 5985 return 0;
bc98a42c 5986 if (sb_rdonly(sb))
2035e776 5987 return 1;
e2b911c5 5988 if (ext4_has_unknown_ext3_ro_compat_features(sb))
2035e776
TT		 5989 return 0;
5990 return 1;
5991}
24b58424 5992
03010a33
TT		 5993static struct file_system_type ext4_fs_type = {
5994 .owner = THIS_MODULE,
5995 .name = "ext4",
152a0836 5996 .mount = ext4_mount,
03010a33
TT		 5997 .kill_sb = kill_block_super,
5998 .fs_flags = FS_REQUIRES_DEV,
5999};
7f78e035 6000MODULE_ALIAS_FS("ext4");
03010a33 6001
e9e3bcec
ES		 6002/* Shared across all ext4 file systems */
6003wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
e9e3bcec 6004
5dabfc78 6005static int __init ext4_init_fs(void)
ac27a0ec 6006{
e9e3bcec 6007 int i, err;
c9de560d 6008
e294a537 6009 ratelimit_state_init(&ext4_mount_msg_ratelimit, 30 * HZ, 64);
07c0c5d8
AV		 6010 ext4_li_info = NULL;
6011 mutex_init(&ext4_li_mtx);
6012
9a4c8019 6013 /* Build-time check for flags consistency */
12e9b892 6014 ext4_check_flag_values();
e9e3bcec 6015
e142d052 6016 for (i = 0; i < EXT4_WQ_HASH_SZ; i++)
e9e3bcec 6017 init_waitqueue_head(&ext4__ioend_wq[i]);
e9e3bcec 6018
51865fda 6019 err = ext4_init_es();
6fd058f7
TT		 6020 if (err)
6021 return err;
51865fda 6022
1dc0aa46
EW		 6023 err = ext4_init_pending();
6024 if (err)
6025 goto out6;
6026
51865fda
ZL		 6027 err = ext4_init_pageio();
6028 if (err)
b5799018 6029 goto out5;
51865fda 6030
5dabfc78 6031 err = ext4_init_system_zone();
bd2d0210 6032 if (err)
b5799018 6033 goto out4;
857ac889 6034
b5799018 6035 err = ext4_init_sysfs();
dd68314c 6036 if (err)
b5799018 6037 goto out3;
857ac889 6038
5dabfc78 6039 err = ext4_init_mballoc();
c9de560d
AT		 6040 if (err)
6041 goto out2;
ac27a0ec
DK		 6042 err = init_inodecache();
6043 if (err)
6044 goto out1;
24b58424 6045 register_as_ext3();
2035e776 6046 register_as_ext2();
03010a33 6047 err = register_filesystem(&ext4_fs_type);
ac27a0ec
DK		 6048 if (err)
6049 goto out;
bfff6873 6050
ac27a0ec
DK		 6051 return 0;
6052out:
24b58424
TT		 6053 unregister_as_ext2();
6054 unregister_as_ext3();
ac27a0ec
DK		 6055 destroy_inodecache();
6056out1:
5dabfc78 6057 ext4_exit_mballoc();
9c191f70 6058out2:
b5799018
TT		 6059 ext4_exit_sysfs();
6060out3:
5dabfc78 6061 ext4_exit_system_zone();
b5799018 6062out4:
5dabfc78 6063 ext4_exit_pageio();
b5799018 6064out5:
1dc0aa46
EW		 6065 ext4_exit_pending();
6066out6:
51865fda
ZL		 6067 ext4_exit_es();
6068
ac27a0ec
DK		 6069 return err;
6070}
6071
5dabfc78 6072static void __exit ext4_exit_fs(void)
ac27a0ec 6073{
bfff6873 6074 ext4_destroy_lazyinit_thread();
24b58424
TT		 6075 unregister_as_ext2();
6076 unregister_as_ext3();
03010a33 6077 unregister_filesystem(&ext4_fs_type);
ac27a0ec 6078 destroy_inodecache();
5dabfc78 6079 ext4_exit_mballoc();
b5799018 6080 ext4_exit_sysfs();
5dabfc78
TT		 6081 ext4_exit_system_zone();
6082 ext4_exit_pageio();
dd12ed14 6083 ext4_exit_es();
1dc0aa46 6084 ext4_exit_pending();
ac27a0ec
DK		 6085}
6086
6087MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
83982b6f 6088MODULE_DESCRIPTION("Fourth Extended Filesystem");
ac27a0ec 6089MODULE_LICENSE("GPL");
7ef79ad5 6090MODULE_SOFTDEP("pre: crc32c");
5dabfc78
TT		 6091module_init(ext4_init_fs)
6092module_exit(ext4_exit_fs)
Empty description
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