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ac27a0ec 1/*
617ba13b 2 * linux/fs/ext4/super.c
ac27a0ec
DK		 3 *
4 * Copyright (C) 1992, 1993, 1994, 1995
5 * Remy Card ([email protected])
6 * Laboratoire MASI - Institut Blaise Pascal
7 * Universite Pierre et Marie Curie (Paris VI)
8 *
9 * from
10 *
11 * linux/fs/minix/inode.c
12 *
13 * Copyright (C) 1991, 1992 Linus Torvalds
14 *
15 * Big-endian to little-endian byte-swapping/bitmaps by
16 * David S. Miller ([email protected]), 1995
17 */
18
19#include <linux/module.h>
20#include <linux/string.h>
21#include <linux/fs.h>
22#include <linux/time.h>
c5ca7c76 23#include <linux/vmalloc.h>
ac27a0ec
DK		 24#include <linux/slab.h>
25#include <linux/init.h>
26#include <linux/blkdev.h>
66114cad 27#include <linux/backing-dev.h>
ac27a0ec 28#include <linux/parser.h>
ac27a0ec 29#include <linux/buffer_head.h>
a5694255 30#include <linux/exportfs.h>
ac27a0ec
DK		 31#include <linux/vfs.h>
32#include <linux/random.h>
33#include <linux/mount.h>
34#include <linux/namei.h>
35#include <linux/quotaops.h>
36#include <linux/seq_file.h>
3197ebdb 37#include <linux/ctype.h>
1330593e 38#include <linux/log2.h>
717d50e4 39#include <linux/crc16.h>
7abc52c2 40#include <linux/cleancache.h>
7c0f6ba6 41#include <linux/uaccess.h>
ac27a0ec 42
bfff6873
LC		 43#include <linux/kthread.h>
44#include <linux/freezer.h>
45
3dcf5451 46#include "ext4.h"
4a092d73 47#include "ext4_extents.h" /* Needed for trace points definition */
3dcf5451 48#include "ext4_jbd2.h"
ac27a0ec
DK		 49#include "xattr.h"
50#include "acl.h"
3661d286 51#include "mballoc.h"
ac27a0ec 52
9bffad1e
TT		 53#define CREATE_TRACE_POINTS
54#include <trace/events/ext4.h>
55
0b75a840
LC		 56static struct ext4_lazy_init *ext4_li_info;
57static struct mutex ext4_li_mtx;
e294a537 58static struct ratelimit_state ext4_mount_msg_ratelimit;
9f6200bb 59
617ba13b 60static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
ac27a0ec 61 unsigned long journal_devnum);
2adf6da8 62static int ext4_show_options(struct seq_file *seq, struct dentry *root);
e2d67052 63static int ext4_commit_super(struct super_block *sb, int sync);
2b2d6d01
TT		 64static void ext4_mark_recovery_complete(struct super_block *sb,
65 struct ext4_super_block *es);
66static void ext4_clear_journal_err(struct super_block *sb,
67 struct ext4_super_block *es);
617ba13b 68static int ext4_sync_fs(struct super_block *sb, int wait);
2b2d6d01
TT		 69static int ext4_remount(struct super_block *sb, int *flags, char *data);
70static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
c4be0c1d 71static int ext4_unfreeze(struct super_block *sb);
c4be0c1d 72static int ext4_freeze(struct super_block *sb);
152a0836
AV		 73static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
74 const char *dev_name, void *data);
2035e776
TT		 75static inline int ext2_feature_set_ok(struct super_block *sb);
76static inline int ext3_feature_set_ok(struct super_block *sb);
d39195c3 77static int ext4_feature_set_ok(struct super_block *sb, int readonly);
bfff6873
LC		 78static void ext4_destroy_lazyinit_thread(void);
79static void ext4_unregister_li_request(struct super_block *sb);
8f1f7453 80static void ext4_clear_request_list(void);
c6cb7e77
EW		 81static struct inode *ext4_get_journal_inode(struct super_block *sb,
82 unsigned int journal_inum);
ac27a0ec 83
e74031fd
JK		 84/*
85 * Lock ordering
86 *
87 * Note the difference between i_mmap_sem (EXT4_I(inode)->i_mmap_sem) and
88 * i_mmap_rwsem (inode->i_mmap_rwsem)!
89 *
90 * page fault path:
91 * mmap_sem -> sb_start_pagefault -> i_mmap_sem (r) -> transaction start ->
92 * page lock -> i_data_sem (rw)
93 *
94 * buffered write path:
95 * sb_start_write -> i_mutex -> mmap_sem
96 * sb_start_write -> i_mutex -> transaction start -> page lock ->
97 * i_data_sem (rw)
98 *
99 * truncate:
100 * sb_start_write -> i_mutex -> EXT4_STATE_DIOREAD_LOCK (w) -> i_mmap_sem (w) ->
101 * i_mmap_rwsem (w) -> page lock
102 * sb_start_write -> i_mutex -> EXT4_STATE_DIOREAD_LOCK (w) -> i_mmap_sem (w) ->
103 * transaction start -> i_data_sem (rw)
104 *
105 * direct IO:
106 * sb_start_write -> i_mutex -> EXT4_STATE_DIOREAD_LOCK (r) -> mmap_sem
107 * sb_start_write -> i_mutex -> EXT4_STATE_DIOREAD_LOCK (r) ->
108 * transaction start -> i_data_sem (rw)
109 *
110 * writepages:
111 * transaction start -> page lock(s) -> i_data_sem (rw)
112 */
113
c290ea01 114#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2)
2035e776
TT		 115static struct file_system_type ext2_fs_type = {
116 .owner = THIS_MODULE,
117 .name = "ext2",
118 .mount = ext4_mount,
119 .kill_sb = kill_block_super,
120 .fs_flags = FS_REQUIRES_DEV,
121};
7f78e035 122MODULE_ALIAS_FS("ext2");
fa7614dd 123MODULE_ALIAS("ext2");
2035e776
TT		 124#define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type)
125#else
126#define IS_EXT2_SB(sb) (0)
127#endif
128
129
ba69f9ab
JK		 130static struct file_system_type ext3_fs_type = {
131 .owner = THIS_MODULE,
132 .name = "ext3",
152a0836 133 .mount = ext4_mount,
ba69f9ab
JK		 134 .kill_sb = kill_block_super,
135 .fs_flags = FS_REQUIRES_DEV,
136};
7f78e035 137MODULE_ALIAS_FS("ext3");
fa7614dd 138MODULE_ALIAS("ext3");
ba69f9ab 139#define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type)
bd81d8ee 140
d25425f8
DW		 141static int ext4_verify_csum_type(struct super_block *sb,
142 struct ext4_super_block *es)
143{
e2b911c5 144 if (!ext4_has_feature_metadata_csum(sb))
d25425f8
DW		 145 return 1;
146
147 return es->s_checksum_type == EXT4_CRC32C_CHKSUM;
148}
149
a9c47317
DW		 150static __le32 ext4_superblock_csum(struct super_block *sb,
151 struct ext4_super_block *es)
152{
153 struct ext4_sb_info *sbi = EXT4_SB(sb);
154 int offset = offsetof(struct ext4_super_block, s_checksum);
155 __u32 csum;
156
157 csum = ext4_chksum(sbi, ~0, (char *)es, offset);
158
159 return cpu_to_le32(csum);
160}
161
c197855e
SH		 162static int ext4_superblock_csum_verify(struct super_block *sb,
163 struct ext4_super_block *es)
a9c47317 164{
9aa5d32b 165 if (!ext4_has_metadata_csum(sb))
a9c47317
DW		 166 return 1;
167
168 return es->s_checksum == ext4_superblock_csum(sb, es);
169}
170
06db49e6 171void ext4_superblock_csum_set(struct super_block *sb)
a9c47317 172{
06db49e6
TT		 173 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
174
9aa5d32b 175 if (!ext4_has_metadata_csum(sb))
a9c47317
DW		 176 return;
177
178 es->s_checksum = ext4_superblock_csum(sb, es);
179}
180
9933fc0a
TT		 181void *ext4_kvmalloc(size_t size, gfp_t flags)
182{
183 void *ret;
184
8be04b93 185 ret = kmalloc(size, flags | __GFP_NOWARN);
9933fc0a
TT		 186 if (!ret)
187 ret = __vmalloc(size, flags, PAGE_KERNEL);
188 return ret;
189}
190
191void *ext4_kvzalloc(size_t size, gfp_t flags)
192{
193 void *ret;
194
8be04b93 195 ret = kzalloc(size, flags | __GFP_NOWARN);
9933fc0a
TT		 196 if (!ret)
197 ret = __vmalloc(size, flags | __GFP_ZERO, PAGE_KERNEL);
198 return ret;
199}
200
8fadc143
AR		 201ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
202 struct ext4_group_desc *bg)
bd81d8ee 203{
3a14589c 204 return le32_to_cpu(bg->bg_block_bitmap_lo) |
8fadc143 205 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 206 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 207}
208
8fadc143
AR		 209ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
210 struct ext4_group_desc *bg)
bd81d8ee 211{
5272f837 212 return le32_to_cpu(bg->bg_inode_bitmap_lo) |
8fadc143 213 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 214 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 215}
216
8fadc143
AR		 217ext4_fsblk_t ext4_inode_table(struct super_block *sb,
218 struct ext4_group_desc *bg)
bd81d8ee 219{
5272f837 220 return le32_to_cpu(bg->bg_inode_table_lo) |
8fadc143 221 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 222 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
bd81d8ee
LV		 223}
224
021b65bb
TT		 225__u32 ext4_free_group_clusters(struct super_block *sb,
226 struct ext4_group_desc *bg)
560671a0
AK		 227{
228 return le16_to_cpu(bg->bg_free_blocks_count_lo) |
229 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 230 (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0);
560671a0
AK		 231}
232
233__u32 ext4_free_inodes_count(struct super_block *sb,
234 struct ext4_group_desc *bg)
235{
236 return le16_to_cpu(bg->bg_free_inodes_count_lo) |
237 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 238 (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0);
560671a0
AK		 239}
240
241__u32 ext4_used_dirs_count(struct super_block *sb,
242 struct ext4_group_desc *bg)
243{
244 return le16_to_cpu(bg->bg_used_dirs_count_lo) |
245 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 246 (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0);
560671a0
AK		 247}
248
249__u32 ext4_itable_unused_count(struct super_block *sb,
250 struct ext4_group_desc *bg)
251{
252 return le16_to_cpu(bg->bg_itable_unused_lo) |
253 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 254 (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0);
560671a0
AK		 255}
256
8fadc143
AR		 257void ext4_block_bitmap_set(struct super_block *sb,
258 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 259{
3a14589c 260 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 261 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
262 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 263}
264
8fadc143
AR		 265void ext4_inode_bitmap_set(struct super_block *sb,
266 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 267{
5272f837 268 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 269 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
270 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 271}
272
8fadc143
AR		 273void ext4_inode_table_set(struct super_block *sb,
274 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 275{
5272f837 276 bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 277 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
278 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 279}
280
021b65bb
TT		 281void ext4_free_group_clusters_set(struct super_block *sb,
282 struct ext4_group_desc *bg, __u32 count)
560671a0
AK		 283{
284 bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count);
285 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
286 bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16);
287}
288
289void ext4_free_inodes_set(struct super_block *sb,
290 struct ext4_group_desc *bg, __u32 count)
291{
292 bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count);
293 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
294 bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16);
295}
296
297void ext4_used_dirs_set(struct super_block *sb,
298 struct ext4_group_desc *bg, __u32 count)
299{
300 bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count);
301 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
302 bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16);
303}
304
305void ext4_itable_unused_set(struct super_block *sb,
306 struct ext4_group_desc *bg, __u32 count)
307{
308 bg->bg_itable_unused_lo = cpu_to_le16((__u16)count);
309 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
310 bg->bg_itable_unused_hi = cpu_to_le16(count >> 16);
311}
312
d3d1faf6 313
1c13d5c0
TT		 314static void __save_error_info(struct super_block *sb, const char *func,
315 unsigned int line)
316{
317 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
318
319 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
1b46617b
TT		 320 if (bdev_read_only(sb->s_bdev))
321 return;
1c13d5c0
TT		 322 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
323 es->s_last_error_time = cpu_to_le32(get_seconds());
324 strncpy(es->s_last_error_func, func, sizeof(es->s_last_error_func));
325 es->s_last_error_line = cpu_to_le32(line);
326 if (!es->s_first_error_time) {
327 es->s_first_error_time = es->s_last_error_time;
328 strncpy(es->s_first_error_func, func,
329 sizeof(es->s_first_error_func));
330 es->s_first_error_line = cpu_to_le32(line);
331 es->s_first_error_ino = es->s_last_error_ino;
332 es->s_first_error_block = es->s_last_error_block;
333 }
66e61a9e
TT		 334 /*
335 * Start the daily error reporting function if it hasn't been
336 * started already
337 */
338 if (!es->s_error_count)
339 mod_timer(&EXT4_SB(sb)->s_err_report, jiffies + 24*60*60*HZ);
ba39ebb6 340 le32_add_cpu(&es->s_error_count, 1);
1c13d5c0
TT		 341}
342
343static void save_error_info(struct super_block *sb, const char *func,
344 unsigned int line)
345{
346 __save_error_info(sb, func, line);
347 ext4_commit_super(sb, 1);
348}
349
bdfe0cbd
TT		 350/*
351 * The del_gendisk() function uninitializes the disk-specific data
352 * structures, including the bdi structure, without telling anyone
353 * else. Once this happens, any attempt to call mark_buffer_dirty()
354 * (for example, by ext4_commit_super), will cause a kernel OOPS.
355 * This is a kludge to prevent these oops until we can put in a proper
356 * hook in del_gendisk() to inform the VFS and file system layers.
357 */
358static int block_device_ejected(struct super_block *sb)
359{
360 struct inode *bd_inode = sb->s_bdev->bd_inode;
361 struct backing_dev_info *bdi = inode_to_bdi(bd_inode);
362
363 return bdi->dev == NULL;
364}
365
18aadd47
BJ		 366static void ext4_journal_commit_callback(journal_t *journal, transaction_t *txn)
367{
368 struct super_block *sb = journal->j_private;
369 struct ext4_sb_info *sbi = EXT4_SB(sb);
370 int error = is_journal_aborted(journal);
5d3ee208 371 struct ext4_journal_cb_entry *jce;
18aadd47 372
5d3ee208 373 BUG_ON(txn->t_state == T_FINISHED);
18aadd47 374 spin_lock(&sbi->s_md_lock);
5d3ee208
DM		 375 while (!list_empty(&txn->t_private_list)) {
376 jce = list_entry(txn->t_private_list.next,
377 struct ext4_journal_cb_entry, jce_list);
18aadd47
BJ		 378 list_del_init(&jce->jce_list);
379 spin_unlock(&sbi->s_md_lock);
380 jce->jce_func(sb, jce, error);
381 spin_lock(&sbi->s_md_lock);
382 }
383 spin_unlock(&sbi->s_md_lock);
384}
1c13d5c0 385
ac27a0ec
DK		 386/* Deal with the reporting of failure conditions on a filesystem such as
387 * inconsistencies detected or read IO failures.
388 *
389 * On ext2, we can store the error state of the filesystem in the
617ba13b 390 * superblock. That is not possible on ext4, because we may have other
ac27a0ec
DK		 391 * write ordering constraints on the superblock which prevent us from
392 * writing it out straight away; and given that the journal is about to
393 * be aborted, we can't rely on the current, or future, transactions to
394 * write out the superblock safely.
395 *
dab291af 396 * We'll just use the jbd2_journal_abort() error code to record an error in
d6b198bc 397 * the journal instead. On recovery, the journal will complain about
ac27a0ec
DK		 398 * that error until we've noted it down and cleared it.
399 */
400
617ba13b 401static void ext4_handle_error(struct super_block *sb)
ac27a0ec 402{
ac27a0ec
DK		 403 if (sb->s_flags & MS_RDONLY)
404 return;
405
2b2d6d01 406 if (!test_opt(sb, ERRORS_CONT)) {
617ba13b 407 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 408
4ab2f15b 409 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
ac27a0ec 410 if (journal)
dab291af 411 jbd2_journal_abort(journal, -EIO);
ac27a0ec 412 }
2b2d6d01 413 if (test_opt(sb, ERRORS_RO)) {
b31e1552 414 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
4418e141
DM		 415 /*
416 * Make sure updated value of ->s_mount_flags will be visible
417 * before ->s_flags update
418 */
419 smp_wmb();
ac27a0ec
DK		 420 sb->s_flags |= MS_RDONLY;
421 }
4327ba52
DJ		 422 if (test_opt(sb, ERRORS_PANIC)) {
423 if (EXT4_SB(sb)->s_journal &&
424 !(EXT4_SB(sb)->s_journal->j_flags & JBD2_REC_ERR))
425 return;
617ba13b 426 panic("EXT4-fs (device %s): panic forced after error\n",
ac27a0ec 427 sb->s_id);
4327ba52 428 }
ac27a0ec
DK		 429}
430
efbed4dc
TT		 431#define ext4_error_ratelimit(sb) \
432 ___ratelimit(&(EXT4_SB(sb)->s_err_ratelimit_state), \
433 "EXT4-fs error")
434
12062ddd 435void __ext4_error(struct super_block *sb, const char *function,
c398eda0 436 unsigned int line, const char *fmt, ...)
ac27a0ec 437{
0ff2ea7d 438 struct va_format vaf;
ac27a0ec
DK		 439 va_list args;
440
0db1ff22
TT		 441 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
442 return;
443
efbed4dc
TT		 444 if (ext4_error_ratelimit(sb)) {
445 va_start(args, fmt);
446 vaf.fmt = fmt;
447 vaf.va = &args;
448 printk(KERN_CRIT
449 "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n",
450 sb->s_id, function, line, current->comm, &vaf);
451 va_end(args);
452 }
f3fc0210 453 save_error_info(sb, function, line);
617ba13b 454 ext4_handle_error(sb);
ac27a0ec
DK		 455}
456
e7c96e8e
JP		 457void __ext4_error_inode(struct inode *inode, const char *function,
458 unsigned int line, ext4_fsblk_t block,
459 const char *fmt, ...)
273df556
FM		 460{
461 va_list args;
f7c21177 462 struct va_format vaf;
1c13d5c0 463 struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
273df556 464
0db1ff22
TT		 465 if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
466 return;
467
1c13d5c0
TT		 468 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
469 es->s_last_error_block = cpu_to_le64(block);
efbed4dc
TT		 470 if (ext4_error_ratelimit(inode->i_sb)) {
471 va_start(args, fmt);
472 vaf.fmt = fmt;
473 vaf.va = &args;
474 if (block)
475 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
476 "inode #%lu: block %llu: comm %s: %pV\n",
477 inode->i_sb->s_id, function, line, inode->i_ino,
478 block, current->comm, &vaf);
479 else
480 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
481 "inode #%lu: comm %s: %pV\n",
482 inode->i_sb->s_id, function, line, inode->i_ino,
483 current->comm, &vaf);
484 va_end(args);
485 }
1c13d5c0 486 save_error_info(inode->i_sb, function, line);
273df556
FM		 487 ext4_handle_error(inode->i_sb);
488}
489
e7c96e8e
JP		 490void __ext4_error_file(struct file *file, const char *function,
491 unsigned int line, ext4_fsblk_t block,
492 const char *fmt, ...)
273df556
FM		 493{
494 va_list args;
f7c21177 495 struct va_format vaf;
1c13d5c0 496 struct ext4_super_block *es;
496ad9aa 497 struct inode *inode = file_inode(file);
273df556
FM		 498 char pathname[80], *path;
499
0db1ff22
TT		 500 if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
501 return;
502
1c13d5c0
TT		 503 es = EXT4_SB(inode->i_sb)->s_es;
504 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
efbed4dc 505 if (ext4_error_ratelimit(inode->i_sb)) {
9bf39ab2 506 path = file_path(file, pathname, sizeof(pathname));
efbed4dc
TT		 507 if (IS_ERR(path))
508 path = "(unknown)";
509 va_start(args, fmt);
510 vaf.fmt = fmt;
511 vaf.va = &args;
512 if (block)
513 printk(KERN_CRIT
514 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
515 "block %llu: comm %s: path %s: %pV\n",
516 inode->i_sb->s_id, function, line, inode->i_ino,
517 block, current->comm, path, &vaf);
518 else
519 printk(KERN_CRIT
520 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
521 "comm %s: path %s: %pV\n",
522 inode->i_sb->s_id, function, line, inode->i_ino,
523 current->comm, path, &vaf);
524 va_end(args);
525 }
1c13d5c0 526 save_error_info(inode->i_sb, function, line);
273df556
FM		 527 ext4_handle_error(inode->i_sb);
528}
529
722887dd
TT		 530const char *ext4_decode_error(struct super_block *sb, int errno,
531 char nbuf[16])
ac27a0ec
DK		 532{
533 char *errstr = NULL;
534
535 switch (errno) {
6a797d27
DW		 536 case -EFSCORRUPTED:
537 errstr = "Corrupt filesystem";
538 break;
539 case -EFSBADCRC:
540 errstr = "Filesystem failed CRC";
541 break;
ac27a0ec
DK		 542 case -EIO:
543 errstr = "IO failure";
544 break;
545 case -ENOMEM:
546 errstr = "Out of memory";
547 break;
548 case -EROFS:
78f1ddbb
TT		 549 if (!sb || (EXT4_SB(sb)->s_journal &&
550 EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT))
ac27a0ec
DK		 551 errstr = "Journal has aborted";
552 else
553 errstr = "Readonly filesystem";
554 break;
555 default:
556 /* If the caller passed in an extra buffer for unknown
557 * errors, textualise them now. Else we just return
558 * NULL. */
559 if (nbuf) {
560 /* Check for truncated error codes... */
561 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
562 errstr = nbuf;
563 }
564 break;
565 }
566
567 return errstr;
568}
569
617ba13b 570/* __ext4_std_error decodes expected errors from journaling functions
ac27a0ec
DK		 571 * automatically and invokes the appropriate error response. */
572
c398eda0
TT		 573void __ext4_std_error(struct super_block *sb, const char *function,
574 unsigned int line, int errno)
ac27a0ec
DK		 575{
576 char nbuf[16];
577 const char *errstr;
578
0db1ff22
TT		 579 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
580 return;
581
ac27a0ec
DK		 582 /* Special case: if the error is EROFS, and we're not already
583 * inside a transaction, then there's really no point in logging
584 * an error. */
585 if (errno == -EROFS && journal_current_handle() == NULL &&
586 (sb->s_flags & MS_RDONLY))
587 return;
588
efbed4dc
TT		 589 if (ext4_error_ratelimit(sb)) {
590 errstr = ext4_decode_error(sb, errno, nbuf);
591 printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n",
592 sb->s_id, function, line, errstr);
593 }
ac27a0ec 594
efbed4dc 595 save_error_info(sb, function, line);
617ba13b 596 ext4_handle_error(sb);
ac27a0ec
DK		 597}
598
599/*
617ba13b 600 * ext4_abort is a much stronger failure handler than ext4_error. The
ac27a0ec
DK		 601 * abort function may be used to deal with unrecoverable failures such
602 * as journal IO errors or ENOMEM at a critical moment in log management.
603 *
604 * We unconditionally force the filesystem into an ABORT|READONLY state,
605 * unless the error response on the fs has been set to panic in which
606 * case we take the easy way out and panic immediately.
607 */
608
c67d859e 609void __ext4_abort(struct super_block *sb, const char *function,
c398eda0 610 unsigned int line, const char *fmt, ...)
ac27a0ec 611{
651e1c3b 612 struct va_format vaf;
ac27a0ec
DK		 613 va_list args;
614
0db1ff22
TT		 615 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
616 return;
617
1c13d5c0 618 save_error_info(sb, function, line);
ac27a0ec 619 va_start(args, fmt);
651e1c3b
JP		 620 vaf.fmt = fmt;
621 vaf.va = &args;
622 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: %pV\n",
623 sb->s_id, function, line, &vaf);
ac27a0ec
DK		 624 va_end(args);
625
1c13d5c0
TT		 626 if ((sb->s_flags & MS_RDONLY) == 0) {
627 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
1c13d5c0 628 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
4418e141
DM		 629 /*
630 * Make sure updated value of ->s_mount_flags will be visible
631 * before ->s_flags update
632 */
633 smp_wmb();
634 sb->s_flags |= MS_RDONLY;
1c13d5c0
TT		 635 if (EXT4_SB(sb)->s_journal)
636 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
637 save_error_info(sb, function, line);
638 }
4327ba52
DJ		 639 if (test_opt(sb, ERRORS_PANIC)) {
640 if (EXT4_SB(sb)->s_journal &&
641 !(EXT4_SB(sb)->s_journal->j_flags & JBD2_REC_ERR))
642 return;
617ba13b 643 panic("EXT4-fs panic from previous error\n");
4327ba52 644 }
ac27a0ec
DK		 645}
646
e7c96e8e
JP		 647void __ext4_msg(struct super_block *sb,
648 const char *prefix, const char *fmt, ...)
b31e1552 649{
0ff2ea7d 650 struct va_format vaf;
b31e1552
ES		 651 va_list args;
652
efbed4dc
TT		 653 if (!___ratelimit(&(EXT4_SB(sb)->s_msg_ratelimit_state), "EXT4-fs"))
654 return;
655
b31e1552 656 va_start(args, fmt);
0ff2ea7d
JP		 657 vaf.fmt = fmt;
658 vaf.va = &args;
659 printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
b31e1552
ES		 660 va_end(args);
661}
662
b03a2f7e
AD		 663#define ext4_warning_ratelimit(sb) \
664 ___ratelimit(&(EXT4_SB(sb)->s_warning_ratelimit_state), \
665 "EXT4-fs warning")
666
12062ddd 667void __ext4_warning(struct super_block *sb, const char *function,
c398eda0 668 unsigned int line, const char *fmt, ...)
ac27a0ec 669{
0ff2ea7d 670 struct va_format vaf;
ac27a0ec
DK		 671 va_list args;
672
b03a2f7e 673 if (!ext4_warning_ratelimit(sb))
efbed4dc
TT		 674 return;
675
ac27a0ec 676 va_start(args, fmt);
0ff2ea7d
JP		 677 vaf.fmt = fmt;
678 vaf.va = &args;
679 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: %pV\n",
680 sb->s_id, function, line, &vaf);
ac27a0ec
DK		 681 va_end(args);
682}
683
b03a2f7e
AD		 684void __ext4_warning_inode(const struct inode *inode, const char *function,
685 unsigned int line, const char *fmt, ...)
686{
687 struct va_format vaf;
688 va_list args;
689
690 if (!ext4_warning_ratelimit(inode->i_sb))
691 return;
692
693 va_start(args, fmt);
694 vaf.fmt = fmt;
695 vaf.va = &args;
696 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: "
697 "inode #%lu: comm %s: %pV\n", inode->i_sb->s_id,
698 function, line, inode->i_ino, current->comm, &vaf);
699 va_end(args);
700}
701
e29136f8
TT		 702void __ext4_grp_locked_error(const char *function, unsigned int line,
703 struct super_block *sb, ext4_group_t grp,
704 unsigned long ino, ext4_fsblk_t block,
705 const char *fmt, ...)
5d1b1b3f
AK		 706__releases(bitlock)
707__acquires(bitlock)
708{
0ff2ea7d 709 struct va_format vaf;
5d1b1b3f
AK		 710 va_list args;
711 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
712
0db1ff22
TT		 713 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
714 return;
715
1c13d5c0
TT		 716 es->s_last_error_ino = cpu_to_le32(ino);
717 es->s_last_error_block = cpu_to_le64(block);
718 __save_error_info(sb, function, line);
0ff2ea7d 719
efbed4dc
TT		 720 if (ext4_error_ratelimit(sb)) {
721 va_start(args, fmt);
722 vaf.fmt = fmt;
723 vaf.va = &args;
724 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u, ",
725 sb->s_id, function, line, grp);
726 if (ino)
727 printk(KERN_CONT "inode %lu: ", ino);
728 if (block)
729 printk(KERN_CONT "block %llu:",
730 (unsigned long long) block);
731 printk(KERN_CONT "%pV\n", &vaf);
732 va_end(args);
733 }
5d1b1b3f
AK		 734
735 if (test_opt(sb, ERRORS_CONT)) {
e2d67052 736 ext4_commit_super(sb, 0);
5d1b1b3f
AK		 737 return;
738 }
1c13d5c0 739
5d1b1b3f
AK		 740 ext4_unlock_group(sb, grp);
741 ext4_handle_error(sb);
742 /*
743 * We only get here in the ERRORS_RO case; relocking the group
744 * may be dangerous, but nothing bad will happen since the
745 * filesystem will have already been marked read/only and the
746 * journal has been aborted. We return 1 as a hint to callers
747 * who might what to use the return value from
25985edc 748 * ext4_grp_locked_error() to distinguish between the
5d1b1b3f
AK		 749 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
750 * aggressively from the ext4 function in question, with a
751 * more appropriate error code.
752 */
753 ext4_lock_group(sb, grp);
754 return;
755}
756
617ba13b 757void ext4_update_dynamic_rev(struct super_block *sb)
ac27a0ec 758{
617ba13b 759 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
ac27a0ec 760
617ba13b 761 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
ac27a0ec
DK		 762 return;
763
12062ddd 764 ext4_warning(sb,
ac27a0ec
DK		 765 "updating to rev %d because of new feature flag, "
766 "running e2fsck is recommended",
617ba13b 767 EXT4_DYNAMIC_REV);
ac27a0ec 768
617ba13b
MC		 769 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
770 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
771 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
ac27a0ec
DK		 772 /* leave es->s_feature_*compat flags alone */
773 /* es->s_uuid will be set by e2fsck if empty */
774
775 /*
776 * The rest of the superblock fields should be zero, and if not it
777 * means they are likely already in use, so leave them alone. We
778 * can leave it up to e2fsck to clean up any inconsistencies there.
779 */
780}
781
782/*
783 * Open the external journal device
784 */
b31e1552 785static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb)
ac27a0ec
DK		 786{
787 struct block_device *bdev;
788 char b[BDEVNAME_SIZE];
789
d4d77629 790 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
ac27a0ec
DK		 791 if (IS_ERR(bdev))
792 goto fail;
793 return bdev;
794
795fail:
b31e1552 796 ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld",
ac27a0ec
DK		 797 __bdevname(dev, b), PTR_ERR(bdev));
798 return NULL;
799}
800
801/*
802 * Release the journal device
803 */
4385bab1 804static void ext4_blkdev_put(struct block_device *bdev)
ac27a0ec 805{
4385bab1 806 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
ac27a0ec
DK		 807}
808
4385bab1 809static void ext4_blkdev_remove(struct ext4_sb_info *sbi)
ac27a0ec
DK		 810{
811 struct block_device *bdev;
ac27a0ec
DK		 812 bdev = sbi->journal_bdev;
813 if (bdev) {
4385bab1 814 ext4_blkdev_put(bdev);
ac27a0ec
DK		 815 sbi->journal_bdev = NULL;
816 }
ac27a0ec
DK		 817}
818
819static inline struct inode *orphan_list_entry(struct list_head *l)
820{
617ba13b 821 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
ac27a0ec
DK		 822}
823
617ba13b 824static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
ac27a0ec
DK		 825{
826 struct list_head *l;
827
b31e1552
ES		 828 ext4_msg(sb, KERN_ERR, "sb orphan head is %d",
829 le32_to_cpu(sbi->s_es->s_last_orphan));
ac27a0ec
DK		 830
831 printk(KERN_ERR "sb_info orphan list:\n");
832 list_for_each(l, &sbi->s_orphan) {
833 struct inode *inode = orphan_list_entry(l);
834 printk(KERN_ERR " "
835 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
836 inode->i_sb->s_id, inode->i_ino, inode,
837 inode->i_mode, inode->i_nlink,
838 NEXT_ORPHAN(inode));
839 }
840}
841
957153fc
JK		 842#ifdef CONFIG_QUOTA
843static int ext4_quota_off(struct super_block *sb, int type);
844
845static inline void ext4_quota_off_umount(struct super_block *sb)
846{
847 int type;
848
849 if (ext4_has_feature_quota(sb)) {
850 dquot_disable(sb, -1,
851 DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
852 } else {
853 /* Use our quota_off function to clear inode flags etc. */
854 for (type = 0; type < EXT4_MAXQUOTAS; type++)
855 ext4_quota_off(sb, type);
856 }
857}
858#else
859static inline void ext4_quota_off_umount(struct super_block *sb)
860{
861}
862#endif
863
2b2d6d01 864static void ext4_put_super(struct super_block *sb)
ac27a0ec 865{
617ba13b
MC		 866 struct ext4_sb_info *sbi = EXT4_SB(sb);
867 struct ext4_super_block *es = sbi->s_es;
97abd7d4 868 int aborted = 0;
ef2cabf7 869 int i, err;
ac27a0ec 870
857ac889 871 ext4_unregister_li_request(sb);
957153fc 872 ext4_quota_off_umount(sb);
e0ccfd95 873
2e8fa54e 874 flush_workqueue(sbi->rsv_conversion_wq);
2e8fa54e 875 destroy_workqueue(sbi->rsv_conversion_wq);
4c0425ff 876
0390131b 877 if (sbi->s_journal) {
97abd7d4 878 aborted = is_journal_aborted(sbi->s_journal);
0390131b
FM		 879 err = jbd2_journal_destroy(sbi->s_journal);
880 sbi->s_journal = NULL;
97abd7d4 881 if ((err < 0) && !aborted)
c67d859e 882 ext4_abort(sb, "Couldn't clean up the journal");
0390131b 883 }
d4edac31 884
ebd173be 885 ext4_unregister_sysfs(sb);
d3922a77 886 ext4_es_unregister_shrinker(sbi);
9105bb14 887 del_timer_sync(&sbi->s_err_report);
d4edac31
JB		 888 ext4_release_system_zone(sb);
889 ext4_mb_release(sb);
890 ext4_ext_release(sb);
d4edac31 891
97abd7d4 892 if (!(sb->s_flags & MS_RDONLY) && !aborted) {
e2b911c5 893 ext4_clear_feature_journal_needs_recovery(sb);
ac27a0ec 894 es->s_state = cpu_to_le16(sbi->s_mount_state);
ac27a0ec 895 }
58c5873a 896 if (!(sb->s_flags & MS_RDONLY))
a8e25a83
AB		 897 ext4_commit_super(sb, 1);
898
ac27a0ec
DK		 899 for (i = 0; i < sbi->s_gdb_count; i++)
900 brelse(sbi->s_group_desc[i]);
b93b41d4
AV		 901 kvfree(sbi->s_group_desc);
902 kvfree(sbi->s_flex_groups);
57042651 903 percpu_counter_destroy(&sbi->s_freeclusters_counter);
ac27a0ec
DK		 904 percpu_counter_destroy(&sbi->s_freeinodes_counter);
905 percpu_counter_destroy(&sbi->s_dirs_counter);
57042651 906 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
c8585c6f 907 percpu_free_rwsem(&sbi->s_journal_flag_rwsem);
ac27a0ec 908#ifdef CONFIG_QUOTA
a2d4a646 909 for (i = 0; i < EXT4_MAXQUOTAS; i++)
ac27a0ec
DK		 910 kfree(sbi->s_qf_names[i]);
911#endif
912
913 /* Debugging code just in case the in-memory inode orphan list
914 * isn't empty. The on-disk one can be non-empty if we've
915 * detected an error and taken the fs readonly, but the
916 * in-memory list had better be clean by this point. */
917 if (!list_empty(&sbi->s_orphan))
918 dump_orphan_list(sb, sbi);
919 J_ASSERT(list_empty(&sbi->s_orphan));
920
89d96a6f 921 sync_blockdev(sb->s_bdev);
f98393a6 922 invalidate_bdev(sb->s_bdev);
ac27a0ec
DK		 923 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
924 /*
925 * Invalidate the journal device's buffers. We don't want them
926 * floating about in memory - the physical journal device may
927 * hotswapped, and it breaks the `ro-after' testing code.
928 */
929 sync_blockdev(sbi->journal_bdev);
f98393a6 930 invalidate_bdev(sbi->journal_bdev);
617ba13b 931 ext4_blkdev_remove(sbi);
ac27a0ec 932 }
9c191f70
M		 933 if (sbi->s_mb_cache) {
934 ext4_xattr_destroy_cache(sbi->s_mb_cache);
935 sbi->s_mb_cache = NULL;
936 }
c5e06d10
JL		 937 if (sbi->s_mmp_tsk)
938 kthread_stop(sbi->s_mmp_tsk);
9060dd2c 939 brelse(sbi->s_sbh);
ac27a0ec 940 sb->s_fs_info = NULL;
3197ebdb
TT		 941 /*
942 * Now that we are completely done shutting down the
943 * superblock, we need to actually destroy the kobject.
944 */
3197ebdb
TT		 945 kobject_put(&sbi->s_kobj);
946 wait_for_completion(&sbi->s_kobj_unregister);
0441984a
DW		 947 if (sbi->s_chksum_driver)
948 crypto_free_shash(sbi->s_chksum_driver);
705895b6 949 kfree(sbi->s_blockgroup_lock);
ac27a0ec 950 kfree(sbi);
ac27a0ec
DK		 951}
952
e18b890b 953static struct kmem_cache *ext4_inode_cachep;
ac27a0ec
DK		 954
955/*
956 * Called inside transaction, so use GFP_NOFS
957 */
617ba13b 958static struct inode *ext4_alloc_inode(struct super_block *sb)
ac27a0ec 959{
617ba13b 960 struct ext4_inode_info *ei;
ac27a0ec 961
e6b4f8da 962 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
ac27a0ec
DK		 963 if (!ei)
964 return NULL;
0b8e58a1 965
ac27a0ec 966 ei->vfs_inode.i_version = 1;
202ee5df 967 spin_lock_init(&ei->i_raw_lock);
c9de560d
AT		 968 INIT_LIST_HEAD(&ei->i_prealloc_list);
969 spin_lock_init(&ei->i_prealloc_lock);
9a26b661
ZL		 970 ext4_es_init_tree(&ei->i_es_tree);
971 rwlock_init(&ei->i_es_lock);
edaa53ca 972 INIT_LIST_HEAD(&ei->i_es_list);
eb68d0e2 973 ei->i_es_all_nr = 0;
edaa53ca 974 ei->i_es_shk_nr = 0;
dd475925 975 ei->i_es_shrink_lblk = 0;
d2a17637
MC		 976 ei->i_reserved_data_blocks = 0;
977 ei->i_reserved_meta_blocks = 0;
978 ei->i_allocated_meta_blocks = 0;
9d0be502 979 ei->i_da_metadata_calc_len = 0;
7e731bc9 980 ei->i_da_metadata_calc_last_lblock = 0;
d2a17637 981 spin_lock_init(&(ei->i_block_reservation_lock));
a9e7f447
DM		 982#ifdef CONFIG_QUOTA
983 ei->i_reserved_quota = 0;
96c7e0d9 984 memset(&ei->i_dquot, 0, sizeof(ei->i_dquot));
a9e7f447 985#endif
8aefcd55 986 ei->jinode = NULL;
2e8fa54e 987 INIT_LIST_HEAD(&ei->i_rsv_conversion_list);
744692dc 988 spin_lock_init(&ei->i_completed_io_lock);
b436b9be
JK		 989 ei->i_sync_tid = 0;
990 ei->i_datasync_tid = 0;
e27f41e1 991 atomic_set(&ei->i_unwritten, 0);
2e8fa54e 992 INIT_WORK(&ei->i_rsv_conversion_work, ext4_end_io_rsv_work);
ac27a0ec
DK		 993 return &ei->vfs_inode;
994}
995
7ff9c073
TT		 996static int ext4_drop_inode(struct inode *inode)
997{
998 int drop = generic_drop_inode(inode);
999
1000 trace_ext4_drop_inode(inode, drop);
1001 return drop;
1002}
1003
fa0d7e3d
NP		 1004static void ext4_i_callback(struct rcu_head *head)
1005{
1006 struct inode *inode = container_of(head, struct inode, i_rcu);
fa0d7e3d
NP		 1007 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
1008}
1009
617ba13b 1010static void ext4_destroy_inode(struct inode *inode)
ac27a0ec 1011{
9f7dd93d 1012 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
b31e1552
ES		 1013 ext4_msg(inode->i_sb, KERN_ERR,
1014 "Inode %lu (%p): orphan list check failed!",
1015 inode->i_ino, EXT4_I(inode));
9f7dd93d
VA		 1016 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
1017 EXT4_I(inode), sizeof(struct ext4_inode_info),
1018 true);
1019 dump_stack();
1020 }
fa0d7e3d 1021 call_rcu(&inode->i_rcu, ext4_i_callback);
ac27a0ec
DK		 1022}
1023
51cc5068 1024static void init_once(void *foo)
ac27a0ec 1025{
617ba13b 1026 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
ac27a0ec 1027
a35afb83 1028 INIT_LIST_HEAD(&ei->i_orphan);
a35afb83 1029 init_rwsem(&ei->xattr_sem);
0e855ac8 1030 init_rwsem(&ei->i_data_sem);
ea3d7209 1031 init_rwsem(&ei->i_mmap_sem);
a35afb83 1032 inode_init_once(&ei->vfs_inode);
ac27a0ec
DK		 1033}
1034
e67bc2b3 1035static int __init init_inodecache(void)
ac27a0ec 1036{
617ba13b
MC		 1037 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
1038 sizeof(struct ext4_inode_info),
ac27a0ec 1039 0, (SLAB_RECLAIM_ACCOUNT|
5d097056 1040 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
20c2df83 1041 init_once);
617ba13b 1042 if (ext4_inode_cachep == NULL)
ac27a0ec
DK		 1043 return -ENOMEM;
1044 return 0;
1045}
1046
1047static void destroy_inodecache(void)
1048{
8c0a8537
KS		 1049 /*
1050 * Make sure all delayed rcu free inodes are flushed before we
1051 * destroy cache.
1052 */
1053 rcu_barrier();
617ba13b 1054 kmem_cache_destroy(ext4_inode_cachep);
ac27a0ec
DK		 1055}
1056
0930fcc1 1057void ext4_clear_inode(struct inode *inode)
ac27a0ec 1058{
0930fcc1 1059 invalidate_inode_buffers(inode);
dbd5768f 1060 clear_inode(inode);
9f754758 1061 dquot_drop(inode);
c2ea3fde 1062 ext4_discard_preallocations(inode);
51865fda 1063 ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS);
8aefcd55
TT		 1064 if (EXT4_I(inode)->jinode) {
1065 jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode),
1066 EXT4_I(inode)->jinode);
1067 jbd2_free_inode(EXT4_I(inode)->jinode);
1068 EXT4_I(inode)->jinode = NULL;
1069 }
b7236e21 1070#ifdef CONFIG_EXT4_FS_ENCRYPTION
a7550b30 1071 fscrypt_put_encryption_info(inode, NULL);
b7236e21 1072#endif
ac27a0ec
DK		 1073}
1074
1b961ac0 1075static struct inode *ext4_nfs_get_inode(struct super_block *sb,
0b8e58a1 1076 u64 ino, u32 generation)
ac27a0ec 1077{
ac27a0ec 1078 struct inode *inode;
ac27a0ec 1079
617ba13b 1080 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
ac27a0ec 1081 return ERR_PTR(-ESTALE);
617ba13b 1082 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
ac27a0ec
DK		 1083 return ERR_PTR(-ESTALE);
1084
1085 /* iget isn't really right if the inode is currently unallocated!!
1086 *
617ba13b 1087 * ext4_read_inode will return a bad_inode if the inode had been
ac27a0ec
DK		 1088 * deleted, so we should be safe.
1089 *
1090 * Currently we don't know the generation for parent directory, so
1091 * a generation of 0 means "accept any"
1092 */
f4bb2981 1093 inode = ext4_iget_normal(sb, ino);
1d1fe1ee
DH		 1094 if (IS_ERR(inode))
1095 return ERR_CAST(inode);
1096 if (generation && inode->i_generation != generation) {
ac27a0ec
DK		 1097 iput(inode);
1098 return ERR_PTR(-ESTALE);
1099 }
1b961ac0
CH		 1100
1101 return inode;
1102}
1103
1104static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
0b8e58a1 1105 int fh_len, int fh_type)
1b961ac0
CH		 1106{
1107 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
1108 ext4_nfs_get_inode);
1109}
1110
1111static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
0b8e58a1 1112 int fh_len, int fh_type)
1b961ac0
CH		 1113{
1114 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
1115 ext4_nfs_get_inode);
ac27a0ec
DK		 1116}
1117
c39a7f84
TO		 1118/*
1119 * Try to release metadata pages (indirect blocks, directories) which are
1120 * mapped via the block device. Since these pages could have journal heads
1121 * which would prevent try_to_free_buffers() from freeing them, we must use
1122 * jbd2 layer's try_to_free_buffers() function to release them.
1123 */
0b8e58a1
AD		 1124static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
1125 gfp_t wait)
c39a7f84
TO		 1126{
1127 journal_t *journal = EXT4_SB(sb)->s_journal;
1128
1129 WARN_ON(PageChecked(page));
1130 if (!page_has_buffers(page))
1131 return 0;
1132 if (journal)
1133 return jbd2_journal_try_to_free_buffers(journal, page,
d0164adc 1134 wait & ~__GFP_DIRECT_RECLAIM);
c39a7f84
TO		 1135 return try_to_free_buffers(page);
1136}
1137
a7550b30
JK		 1138#ifdef CONFIG_EXT4_FS_ENCRYPTION
1139static int ext4_get_context(struct inode *inode, void *ctx, size_t len)
1140{
1141 return ext4_xattr_get(inode, EXT4_XATTR_INDEX_ENCRYPTION,
1142 EXT4_XATTR_NAME_ENCRYPTION_CONTEXT, ctx, len);
1143}
1144
a7550b30
JK		 1145static int ext4_prepare_context(struct inode *inode)
1146{
1147 return ext4_convert_inline_data(inode);
1148}
1149
1150static int ext4_set_context(struct inode *inode, const void *ctx, size_t len,
1151 void *fs_data)
1152{
2f8f5e76
EB		 1153 handle_t *handle = fs_data;
1154 int res, res2, retries = 0;
1155
1156 /*
1157 * If a journal handle was specified, then the encryption context is
1158 * being set on a new inode via inheritance and is part of a larger
1159 * transaction to create the inode. Otherwise the encryption context is
1160 * being set on an existing inode in its own transaction. Only in the
1161 * latter case should the "retry on ENOSPC" logic be used.
1162 */
a7550b30 1163
2f8f5e76
EB		 1164 if (handle) {
1165 res = ext4_xattr_set_handle(handle, inode,
1166 EXT4_XATTR_INDEX_ENCRYPTION,
1167 EXT4_XATTR_NAME_ENCRYPTION_CONTEXT,
1168 ctx, len, 0);
a7550b30
JK		 1169 if (!res) {
1170 ext4_set_inode_flag(inode, EXT4_INODE_ENCRYPT);
1171 ext4_clear_inode_state(inode,
1172 EXT4_STATE_MAY_INLINE_DATA);
a3caa24b
JK		 1173 /*
1174 * Update inode->i_flags - e.g. S_DAX may get disabled
1175 */
1176 ext4_set_inode_flags(inode);
a7550b30
JK		 1177 }
1178 return res;
1179 }
1180
2f8f5e76 1181retry:
a7550b30
JK		 1182 handle = ext4_journal_start(inode, EXT4_HT_MISC,
1183 ext4_jbd2_credits_xattr(inode));
1184 if (IS_ERR(handle))
1185 return PTR_ERR(handle);
1186
2f8f5e76
EB		 1187 res = ext4_xattr_set_handle(handle, inode, EXT4_XATTR_INDEX_ENCRYPTION,
1188 EXT4_XATTR_NAME_ENCRYPTION_CONTEXT,
1189 ctx, len, 0);
a7550b30
JK		 1190 if (!res) {
1191 ext4_set_inode_flag(inode, EXT4_INODE_ENCRYPT);
a3caa24b
JK		 1192 /* Update inode->i_flags - e.g. S_DAX may get disabled */
1193 ext4_set_inode_flags(inode);
a7550b30
JK		 1194 res = ext4_mark_inode_dirty(handle, inode);
1195 if (res)
1196 EXT4_ERROR_INODE(inode, "Failed to mark inode dirty");
1197 }
1198 res2 = ext4_journal_stop(handle);
2f8f5e76
EB		 1199
1200 if (res == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
1201 goto retry;
a7550b30
JK		 1202 if (!res)
1203 res = res2;
1204 return res;
1205}
1206
1207static int ext4_dummy_context(struct inode *inode)
1208{
1209 return DUMMY_ENCRYPTION_ENABLED(EXT4_SB(inode->i_sb));
1210}
1211
1212static unsigned ext4_max_namelen(struct inode *inode)
1213{
1214 return S_ISLNK(inode->i_mode) ? inode->i_sb->s_blocksize :
1215 EXT4_NAME_LEN;
1216}
1217
6f69f0ed 1218static const struct fscrypt_operations ext4_cryptops = {
a5d431ef 1219 .key_prefix = "ext4:",
a7550b30 1220 .get_context = ext4_get_context,
a7550b30
JK		 1221 .prepare_context = ext4_prepare_context,
1222 .set_context = ext4_set_context,
1223 .dummy_context = ext4_dummy_context,
1224 .is_encrypted = ext4_encrypted_inode,
1225 .empty_dir = ext4_empty_dir,
1226 .max_namelen = ext4_max_namelen,
1227};
1228#else
6f69f0ed 1229static const struct fscrypt_operations ext4_cryptops = {
a7550b30
JK		 1230 .is_encrypted = ext4_encrypted_inode,
1231};
1232#endif
1233
ac27a0ec 1234#ifdef CONFIG_QUOTA
689c958c
LX		 1235static char *quotatypes[] = INITQFNAMES;
1236#define QTYPE2NAME(t) (quotatypes[t])
ac27a0ec 1237
617ba13b
MC		 1238static int ext4_write_dquot(struct dquot *dquot);
1239static int ext4_acquire_dquot(struct dquot *dquot);
1240static int ext4_release_dquot(struct dquot *dquot);
1241static int ext4_mark_dquot_dirty(struct dquot *dquot);
1242static int ext4_write_info(struct super_block *sb, int type);
6f28e087 1243static int ext4_quota_on(struct super_block *sb, int type, int format_id,
8c54ca9c 1244 const struct path *path);
617ba13b
MC		 1245static int ext4_quota_on_mount(struct super_block *sb, int type);
1246static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec 1247 size_t len, loff_t off);
617ba13b 1248static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec 1249 const char *data, size_t len, loff_t off);
7c319d32
AK		 1250static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
1251 unsigned int flags);
1252static int ext4_enable_quotas(struct super_block *sb);
8f0e8746 1253static int ext4_get_next_id(struct super_block *sb, struct kqid *qid);
ac27a0ec 1254
96c7e0d9
JK		 1255static struct dquot **ext4_get_dquots(struct inode *inode)
1256{
1257 return EXT4_I(inode)->i_dquot;
1258}
1259
61e225dc 1260static const struct dquot_operations ext4_quota_operations = {
60e58e0f 1261 .get_reserved_space = ext4_get_reserved_space,
617ba13b
MC		 1262 .write_dquot = ext4_write_dquot,
1263 .acquire_dquot = ext4_acquire_dquot,
1264 .release_dquot = ext4_release_dquot,
1265 .mark_dirty = ext4_mark_dquot_dirty,
a5b5ee32
JK		 1266 .write_info = ext4_write_info,
1267 .alloc_dquot = dquot_alloc,
1268 .destroy_dquot = dquot_destroy,
040cb378 1269 .get_projid = ext4_get_projid,
8f0e8746 1270 .get_next_id = ext4_get_next_id,
ac27a0ec
DK		 1271};
1272
0d54b217 1273static const struct quotactl_ops ext4_qctl_operations = {
617ba13b 1274 .quota_on = ext4_quota_on,
ca0e05e4 1275 .quota_off = ext4_quota_off,
287a8095 1276 .quota_sync = dquot_quota_sync,
0a240339 1277 .get_state = dquot_get_state,
287a8095
CH		 1278 .set_info = dquot_set_dqinfo,
1279 .get_dqblk = dquot_get_dqblk,
6332b9b5
ES		 1280 .set_dqblk = dquot_set_dqblk,
1281 .get_nextdqblk = dquot_get_next_dqblk,
ac27a0ec
DK		 1282};
1283#endif
1284
ee9b6d61 1285static const struct super_operations ext4_sops = {
617ba13b
MC		 1286 .alloc_inode = ext4_alloc_inode,
1287 .destroy_inode = ext4_destroy_inode,
617ba13b
MC		 1288 .write_inode = ext4_write_inode,
1289 .dirty_inode = ext4_dirty_inode,
7ff9c073 1290 .drop_inode = ext4_drop_inode,
0930fcc1 1291 .evict_inode = ext4_evict_inode,
617ba13b 1292 .put_super = ext4_put_super,
617ba13b 1293 .sync_fs = ext4_sync_fs,
c4be0c1d
TS		 1294 .freeze_fs = ext4_freeze,
1295 .unfreeze_fs = ext4_unfreeze,
617ba13b
MC		 1296 .statfs = ext4_statfs,
1297 .remount_fs = ext4_remount,
617ba13b 1298 .show_options = ext4_show_options,
ac27a0ec 1299#ifdef CONFIG_QUOTA
617ba13b
MC		 1300 .quota_read = ext4_quota_read,
1301 .quota_write = ext4_quota_write,
96c7e0d9 1302 .get_dquots = ext4_get_dquots,
ac27a0ec 1303#endif
c39a7f84 1304 .bdev_try_to_free_page = bdev_try_to_free_page,
ac27a0ec
DK		 1305};
1306
39655164 1307static const struct export_operations ext4_export_ops = {
1b961ac0
CH		 1308 .fh_to_dentry = ext4_fh_to_dentry,
1309 .fh_to_parent = ext4_fh_to_parent,
617ba13b 1310 .get_parent = ext4_get_parent,
ac27a0ec
DK		 1311};
1312
1313enum {
1314 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
1315 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
72578c33 1316 Opt_nouid32, Opt_debug, Opt_removed,
ac27a0ec 1317 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
72578c33 1318 Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload,
ad4eec61
ES		 1319 Opt_commit, Opt_min_batch_time, Opt_max_batch_time, Opt_journal_dev,
1320 Opt_journal_path, Opt_journal_checksum, Opt_journal_async_commit,
ac27a0ec 1321 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
6ddb2447 1322 Opt_data_err_abort, Opt_data_err_ignore, Opt_test_dummy_encryption,
ac27a0ec 1323 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
5a20bdfc 1324 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
ee4a3fcd 1325 Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err,
49da9392 1326 Opt_usrquota, Opt_grpquota, Opt_prjquota, Opt_i_version, Opt_dax,
1449032b 1327 Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_mblk_io_submit,
670e9875 1328 Opt_lazytime, Opt_nolazytime, Opt_debug_want_extra_isize,
1449032b 1329 Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity,
5328e635 1330 Opt_inode_readahead_blks, Opt_journal_ioprio,
744692dc 1331 Opt_dioread_nolock, Opt_dioread_lock,
fc6cb1cd 1332 Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable,
c6d3d56d 1333 Opt_max_dir_size_kb, Opt_nojournal_checksum,
ac27a0ec
DK		 1334};
1335
a447c093 1336static const match_table_t tokens = {
ac27a0ec
DK		 1337 {Opt_bsd_df, "bsddf"},
1338 {Opt_minix_df, "minixdf"},
1339 {Opt_grpid, "grpid"},
1340 {Opt_grpid, "bsdgroups"},
1341 {Opt_nogrpid, "nogrpid"},
1342 {Opt_nogrpid, "sysvgroups"},
1343 {Opt_resgid, "resgid=%u"},
1344 {Opt_resuid, "resuid=%u"},
1345 {Opt_sb, "sb=%u"},
1346 {Opt_err_cont, "errors=continue"},
1347 {Opt_err_panic, "errors=panic"},
1348 {Opt_err_ro, "errors=remount-ro"},
1349 {Opt_nouid32, "nouid32"},
ac27a0ec 1350 {Opt_debug, "debug"},
72578c33
TT		 1351 {Opt_removed, "oldalloc"},
1352 {Opt_removed, "orlov"},
ac27a0ec
DK		 1353 {Opt_user_xattr, "user_xattr"},
1354 {Opt_nouser_xattr, "nouser_xattr"},
1355 {Opt_acl, "acl"},
1356 {Opt_noacl, "noacl"},
e3bb52ae 1357 {Opt_noload, "norecovery"},
5a916be1 1358 {Opt_noload, "noload"},
72578c33
TT		 1359 {Opt_removed, "nobh"},
1360 {Opt_removed, "bh"},
ac27a0ec 1361 {Opt_commit, "commit=%u"},
30773840
TT		 1362 {Opt_min_batch_time, "min_batch_time=%u"},
1363 {Opt_max_batch_time, "max_batch_time=%u"},
ac27a0ec 1364 {Opt_journal_dev, "journal_dev=%u"},
ad4eec61 1365 {Opt_journal_path, "journal_path=%s"},
818d276c 1366 {Opt_journal_checksum, "journal_checksum"},
c6d3d56d 1367 {Opt_nojournal_checksum, "nojournal_checksum"},
818d276c 1368 {Opt_journal_async_commit, "journal_async_commit"},
ac27a0ec
DK		 1369 {Opt_abort, "abort"},
1370 {Opt_data_journal, "data=journal"},
1371 {Opt_data_ordered, "data=ordered"},
1372 {Opt_data_writeback, "data=writeback"},
5bf5683a
HK		 1373 {Opt_data_err_abort, "data_err=abort"},
1374 {Opt_data_err_ignore, "data_err=ignore"},
ac27a0ec
DK		 1375 {Opt_offusrjquota, "usrjquota="},
1376 {Opt_usrjquota, "usrjquota=%s"},
1377 {Opt_offgrpjquota, "grpjquota="},
1378 {Opt_grpjquota, "grpjquota=%s"},
1379 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
1380 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
5a20bdfc 1381 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
ac27a0ec
DK		 1382 {Opt_grpquota, "grpquota"},
1383 {Opt_noquota, "noquota"},
1384 {Opt_quota, "quota"},
1385 {Opt_usrquota, "usrquota"},
49da9392 1386 {Opt_prjquota, "prjquota"},
ac27a0ec 1387 {Opt_barrier, "barrier=%u"},
06705bff
TT		 1388 {Opt_barrier, "barrier"},
1389 {Opt_nobarrier, "nobarrier"},
25ec56b5 1390 {Opt_i_version, "i_version"},
923ae0ff 1391 {Opt_dax, "dax"},
c9de560d 1392 {Opt_stripe, "stripe=%u"},
64769240 1393 {Opt_delalloc, "delalloc"},
a26f4992
TT		 1394 {Opt_lazytime, "lazytime"},
1395 {Opt_nolazytime, "nolazytime"},
670e9875 1396 {Opt_debug_want_extra_isize, "debug_want_extra_isize=%u"},
dd919b98 1397 {Opt_nodelalloc, "nodelalloc"},
36ade451
JK		 1398 {Opt_removed, "mblk_io_submit"},
1399 {Opt_removed, "nomblk_io_submit"},
6fd058f7
TT		 1400 {Opt_block_validity, "block_validity"},
1401 {Opt_noblock_validity, "noblock_validity"},
240799cd 1402 {Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
b3881f74 1403 {Opt_journal_ioprio, "journal_ioprio=%u"},
afd4672d 1404 {Opt_auto_da_alloc, "auto_da_alloc=%u"},
06705bff
TT		 1405 {Opt_auto_da_alloc, "auto_da_alloc"},
1406 {Opt_noauto_da_alloc, "noauto_da_alloc"},
744692dc
JZ		 1407 {Opt_dioread_nolock, "dioread_nolock"},
1408 {Opt_dioread_lock, "dioread_lock"},
5328e635
ES		 1409 {Opt_discard, "discard"},
1410 {Opt_nodiscard, "nodiscard"},
fc6cb1cd
TT		 1411 {Opt_init_itable, "init_itable=%u"},
1412 {Opt_init_itable, "init_itable"},
1413 {Opt_noinit_itable, "noinit_itable"},
df981d03 1414 {Opt_max_dir_size_kb, "max_dir_size_kb=%u"},
6ddb2447 1415 {Opt_test_dummy_encryption, "test_dummy_encryption"},
c7198b9c
TT		 1416 {Opt_removed, "check=none"}, /* mount option from ext2/3 */
1417 {Opt_removed, "nocheck"}, /* mount option from ext2/3 */
1418 {Opt_removed, "reservation"}, /* mount option from ext2/3 */
1419 {Opt_removed, "noreservation"}, /* mount option from ext2/3 */
1420 {Opt_removed, "journal=%u"}, /* mount option from ext2/3 */
f3f12faa 1421 {Opt_err, NULL},
ac27a0ec
DK		 1422};
1423
617ba13b 1424static ext4_fsblk_t get_sb_block(void **data)
ac27a0ec 1425{
617ba13b 1426 ext4_fsblk_t sb_block;
ac27a0ec
DK		 1427 char *options = (char *) *data;
1428
1429 if (!options || strncmp(options, "sb=", 3) != 0)
1430 return 1; /* Default location */
0b8e58a1 1431
ac27a0ec 1432 options += 3;
0b8e58a1 1433 /* TODO: use simple_strtoll with >32bit ext4 */
ac27a0ec
DK		 1434 sb_block = simple_strtoul(options, &options, 0);
1435 if (*options && *options != ',') {
4776004f 1436 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
ac27a0ec
DK		 1437 (char *) *data);
1438 return 1;
1439 }
1440 if (*options == ',')
1441 options++;
1442 *data = (void *) options;
0b8e58a1 1443
ac27a0ec
DK		 1444 return sb_block;
1445}
1446
b3881f74 1447#define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
437ca0fd
DM		 1448static char deprecated_msg[] = "Mount option \"%s\" will be removed by %s\n"
1449 "Contact [email protected] if you think we should keep it.\n";
b3881f74 1450
56c50f11
DM		 1451#ifdef CONFIG_QUOTA
1452static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
1453{
1454 struct ext4_sb_info *sbi = EXT4_SB(sb);
1455 char *qname;
03dafb5f 1456 int ret = -1;
56c50f11
DM		 1457
1458 if (sb_any_quota_loaded(sb) &&
1459 !sbi->s_qf_names[qtype]) {
1460 ext4_msg(sb, KERN_ERR,
1461 "Cannot change journaled "
1462 "quota options when quota turned on");
57f73c2c 1463 return -1;
56c50f11 1464 }
e2b911c5 1465 if (ext4_has_feature_quota(sb)) {
c325a67c
TT		 1466 ext4_msg(sb, KERN_INFO, "Journaled quota options "
1467 "ignored when QUOTA feature is enabled");
1468 return 1;
262b4662 1469 }
56c50f11
DM		 1470 qname = match_strdup(args);
1471 if (!qname) {
1472 ext4_msg(sb, KERN_ERR,
1473 "Not enough memory for storing quotafile name");
57f73c2c 1474 return -1;
56c50f11 1475 }
03dafb5f
CG		 1476 if (sbi->s_qf_names[qtype]) {
1477 if (strcmp(sbi->s_qf_names[qtype], qname) == 0)
1478 ret = 1;
1479 else
1480 ext4_msg(sb, KERN_ERR,
1481 "%s quota file already specified",
1482 QTYPE2NAME(qtype));
1483 goto errout;
56c50f11 1484 }
03dafb5f 1485 if (strchr(qname, '/')) {
56c50f11
DM		 1486 ext4_msg(sb, KERN_ERR,
1487 "quotafile must be on filesystem root");
03dafb5f 1488 goto errout;
56c50f11 1489 }
03dafb5f 1490 sbi->s_qf_names[qtype] = qname;
fd8c37ec 1491 set_opt(sb, QUOTA);
56c50f11 1492 return 1;
03dafb5f
CG		 1493errout:
1494 kfree(qname);
1495 return ret;
56c50f11
DM		 1496}
1497
1498static int clear_qf_name(struct super_block *sb, int qtype)
1499{
1500
1501 struct ext4_sb_info *sbi = EXT4_SB(sb);
1502
1503 if (sb_any_quota_loaded(sb) &&
1504 sbi->s_qf_names[qtype]) {
1505 ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options"
1506 " when quota turned on");
57f73c2c 1507 return -1;
56c50f11 1508 }
03dafb5f 1509 kfree(sbi->s_qf_names[qtype]);
56c50f11
DM		 1510 sbi->s_qf_names[qtype] = NULL;
1511 return 1;
1512}
1513#endif
1514
26092bf5
TT		 1515#define MOPT_SET 0x0001
1516#define MOPT_CLEAR 0x0002
1517#define MOPT_NOSUPPORT 0x0004
1518#define MOPT_EXPLICIT 0x0008
1519#define MOPT_CLEAR_ERR 0x0010
1520#define MOPT_GTE0 0x0020
ac27a0ec 1521#ifdef CONFIG_QUOTA
26092bf5
TT		 1522#define MOPT_Q 0
1523#define MOPT_QFMT 0x0040
1524#else
1525#define MOPT_Q MOPT_NOSUPPORT
1526#define MOPT_QFMT MOPT_NOSUPPORT
ac27a0ec 1527#endif
26092bf5 1528#define MOPT_DATAJ 0x0080
8dc0aa8c
TT		 1529#define MOPT_NO_EXT2 0x0100
1530#define MOPT_NO_EXT3 0x0200
1531#define MOPT_EXT4_ONLY (MOPT_NO_EXT2 | MOPT_NO_EXT3)
ad4eec61 1532#define MOPT_STRING 0x0400
26092bf5
TT		 1533
1534static const struct mount_opts {
1535 int token;
1536 int mount_opt;
1537 int flags;
1538} ext4_mount_opts[] = {
1539 {Opt_minix_df, EXT4_MOUNT_MINIX_DF, MOPT_SET},
1540 {Opt_bsd_df, EXT4_MOUNT_MINIX_DF, MOPT_CLEAR},
1541 {Opt_grpid, EXT4_MOUNT_GRPID, MOPT_SET},
1542 {Opt_nogrpid, EXT4_MOUNT_GRPID, MOPT_CLEAR},
26092bf5
TT		 1543 {Opt_block_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_SET},
1544 {Opt_noblock_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_CLEAR},
8dc0aa8c
TT		 1545 {Opt_dioread_nolock, EXT4_MOUNT_DIOREAD_NOLOCK,
1546 MOPT_EXT4_ONLY | MOPT_SET},
1547 {Opt_dioread_lock, EXT4_MOUNT_DIOREAD_NOLOCK,
1548 MOPT_EXT4_ONLY | MOPT_CLEAR},
26092bf5
TT		 1549 {Opt_discard, EXT4_MOUNT_DISCARD, MOPT_SET},
1550 {Opt_nodiscard, EXT4_MOUNT_DISCARD, MOPT_CLEAR},
8dc0aa8c
TT		 1551 {Opt_delalloc, EXT4_MOUNT_DELALLOC,
1552 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
1553 {Opt_nodelalloc, EXT4_MOUNT_DELALLOC,
59d9fa5c 1554 MOPT_EXT4_ONLY | MOPT_CLEAR},
c6d3d56d
DW		 1555 {Opt_nojournal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
1556 MOPT_EXT4_ONLY | MOPT_CLEAR},
8dc0aa8c 1557 {Opt_journal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
1e381f60 1558 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
26092bf5 1559 {Opt_journal_async_commit, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT |
8dc0aa8c 1560 EXT4_MOUNT_JOURNAL_CHECKSUM),
1e381f60 1561 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
8dc0aa8c 1562 {Opt_noload, EXT4_MOUNT_NOLOAD, MOPT_NO_EXT2 | MOPT_SET},
26092bf5
TT		 1563 {Opt_err_panic, EXT4_MOUNT_ERRORS_PANIC, MOPT_SET | MOPT_CLEAR_ERR},
1564 {Opt_err_ro, EXT4_MOUNT_ERRORS_RO, MOPT_SET | MOPT_CLEAR_ERR},
1565 {Opt_err_cont, EXT4_MOUNT_ERRORS_CONT, MOPT_SET | MOPT_CLEAR_ERR},
8dc0aa8c 1566 {Opt_data_err_abort, EXT4_MOUNT_DATA_ERR_ABORT,
7915a861 1567 MOPT_NO_EXT2},
8dc0aa8c 1568 {Opt_data_err_ignore, EXT4_MOUNT_DATA_ERR_ABORT,
7915a861 1569 MOPT_NO_EXT2},
26092bf5
TT		 1570 {Opt_barrier, EXT4_MOUNT_BARRIER, MOPT_SET},
1571 {Opt_nobarrier, EXT4_MOUNT_BARRIER, MOPT_CLEAR},
1572 {Opt_noauto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_SET},
1573 {Opt_auto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_CLEAR},
1574 {Opt_noinit_itable, EXT4_MOUNT_INIT_INODE_TABLE, MOPT_CLEAR},
1575 {Opt_commit, 0, MOPT_GTE0},
1576 {Opt_max_batch_time, 0, MOPT_GTE0},
1577 {Opt_min_batch_time, 0, MOPT_GTE0},
1578 {Opt_inode_readahead_blks, 0, MOPT_GTE0},
1579 {Opt_init_itable, 0, MOPT_GTE0},
923ae0ff 1580 {Opt_dax, EXT4_MOUNT_DAX, MOPT_SET},
26092bf5 1581 {Opt_stripe, 0, MOPT_GTE0},
0efb3b23
JK		 1582 {Opt_resuid, 0, MOPT_GTE0},
1583 {Opt_resgid, 0, MOPT_GTE0},
5ba92bcf
CM		 1584 {Opt_journal_dev, 0, MOPT_NO_EXT2 | MOPT_GTE0},
1585 {Opt_journal_path, 0, MOPT_NO_EXT2 | MOPT_STRING},
1586 {Opt_journal_ioprio, 0, MOPT_NO_EXT2 | MOPT_GTE0},
8dc0aa8c
TT		 1587 {Opt_data_journal, EXT4_MOUNT_JOURNAL_DATA, MOPT_NO_EXT2 | MOPT_DATAJ},
1588 {Opt_data_ordered, EXT4_MOUNT_ORDERED_DATA, MOPT_NO_EXT2 | MOPT_DATAJ},
1589 {Opt_data_writeback, EXT4_MOUNT_WRITEBACK_DATA,
1590 MOPT_NO_EXT2 | MOPT_DATAJ},
26092bf5
TT		 1591 {Opt_user_xattr, EXT4_MOUNT_XATTR_USER, MOPT_SET},
1592 {Opt_nouser_xattr, EXT4_MOUNT_XATTR_USER, MOPT_CLEAR},
03010a33 1593#ifdef CONFIG_EXT4_FS_POSIX_ACL
26092bf5
TT		 1594 {Opt_acl, EXT4_MOUNT_POSIX_ACL, MOPT_SET},
1595 {Opt_noacl, EXT4_MOUNT_POSIX_ACL, MOPT_CLEAR},
ac27a0ec 1596#else
26092bf5
TT		 1597 {Opt_acl, 0, MOPT_NOSUPPORT},
1598 {Opt_noacl, 0, MOPT_NOSUPPORT},
ac27a0ec 1599#endif
26092bf5
TT		 1600 {Opt_nouid32, EXT4_MOUNT_NO_UID32, MOPT_SET},
1601 {Opt_debug, EXT4_MOUNT_DEBUG, MOPT_SET},
670e9875 1602 {Opt_debug_want_extra_isize, 0, MOPT_GTE0},
26092bf5
TT		 1603 {Opt_quota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA, MOPT_SET | MOPT_Q},
1604 {Opt_usrquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA,
1605 MOPT_SET | MOPT_Q},
1606 {Opt_grpquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_GRPQUOTA,
1607 MOPT_SET | MOPT_Q},
49da9392
JK		 1608 {Opt_prjquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_PRJQUOTA,
1609 MOPT_SET | MOPT_Q},
26092bf5 1610 {Opt_noquota, (EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA |
49da9392
JK		 1611 EXT4_MOUNT_GRPQUOTA | EXT4_MOUNT_PRJQUOTA),
1612 MOPT_CLEAR | MOPT_Q},
26092bf5
TT		 1613 {Opt_usrjquota, 0, MOPT_Q},
1614 {Opt_grpjquota, 0, MOPT_Q},
1615 {Opt_offusrjquota, 0, MOPT_Q},
1616 {Opt_offgrpjquota, 0, MOPT_Q},
1617 {Opt_jqfmt_vfsold, QFMT_VFS_OLD, MOPT_QFMT},
1618 {Opt_jqfmt_vfsv0, QFMT_VFS_V0, MOPT_QFMT},
1619 {Opt_jqfmt_vfsv1, QFMT_VFS_V1, MOPT_QFMT},
df981d03 1620 {Opt_max_dir_size_kb, 0, MOPT_GTE0},
6ddb2447 1621 {Opt_test_dummy_encryption, 0, MOPT_GTE0},
26092bf5
TT		 1622 {Opt_err, 0, 0}
1623};
1624
1625static int handle_mount_opt(struct super_block *sb, char *opt, int token,
1626 substring_t *args, unsigned long *journal_devnum,
1627 unsigned int *journal_ioprio, int is_remount)
1628{
1629 struct ext4_sb_info *sbi = EXT4_SB(sb);
1630 const struct mount_opts *m;
08cefc7a
EB		 1631 kuid_t uid;
1632 kgid_t gid;
26092bf5
TT		 1633 int arg = 0;
1634
57f73c2c
TT		 1635#ifdef CONFIG_QUOTA
1636 if (token == Opt_usrjquota)
1637 return set_qf_name(sb, USRQUOTA, &args[0]);
1638 else if (token == Opt_grpjquota)
1639 return set_qf_name(sb, GRPQUOTA, &args[0]);
1640 else if (token == Opt_offusrjquota)
1641 return clear_qf_name(sb, USRQUOTA);
1642 else if (token == Opt_offgrpjquota)
1643 return clear_qf_name(sb, GRPQUOTA);
1644#endif
26092bf5 1645 switch (token) {
f7048605
TT		 1646 case Opt_noacl:
1647 case Opt_nouser_xattr:
1648 ext4_msg(sb, KERN_WARNING, deprecated_msg, opt, "3.5");
1649 break;
26092bf5
TT		 1650 case Opt_sb:
1651 return 1; /* handled by get_sb_block() */
1652 case Opt_removed:
5f3633e3 1653 ext4_msg(sb, KERN_WARNING, "Ignoring removed %s option", opt);
26092bf5 1654 return 1;
26092bf5
TT		 1655 case Opt_abort:
1656 sbi->s_mount_flags |= EXT4_MF_FS_ABORTED;
1657 return 1;
1658 case Opt_i_version:
1659 sb->s_flags |= MS_I_VERSION;
1660 return 1;
a26f4992
TT		 1661 case Opt_lazytime:
1662 sb->s_flags |= MS_LAZYTIME;
1663 return 1;
1664 case Opt_nolazytime:
1665 sb->s_flags &= ~MS_LAZYTIME;
1666 return 1;
26092bf5
TT		 1667 }
1668
5f3633e3
JK		 1669 for (m = ext4_mount_opts; m->token != Opt_err; m++)
1670 if (token == m->token)
1671 break;
1672
1673 if (m->token == Opt_err) {
1674 ext4_msg(sb, KERN_ERR, "Unrecognized mount option \"%s\" "
1675 "or missing value", opt);
1676 return -1;
1677 }
1678
8dc0aa8c
TT		 1679 if ((m->flags & MOPT_NO_EXT2) && IS_EXT2_SB(sb)) {
1680 ext4_msg(sb, KERN_ERR,
1681 "Mount option \"%s\" incompatible with ext2", opt);
1682 return -1;
1683 }
1684 if ((m->flags & MOPT_NO_EXT3) && IS_EXT3_SB(sb)) {
1685 ext4_msg(sb, KERN_ERR,
1686 "Mount option \"%s\" incompatible with ext3", opt);
1687 return -1;
1688 }
1689
ad4eec61 1690 if (args->from && !(m->flags & MOPT_STRING) && match_int(args, &arg))
5f3633e3
JK		 1691 return -1;
1692 if (args->from && (m->flags & MOPT_GTE0) && (arg < 0))
1693 return -1;
c93cf2d7
DM		 1694 if (m->flags & MOPT_EXPLICIT) {
1695 if (m->mount_opt & EXT4_MOUNT_DELALLOC) {
1696 set_opt2(sb, EXPLICIT_DELALLOC);
1e381f60
DM		 1697 } else if (m->mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) {
1698 set_opt2(sb, EXPLICIT_JOURNAL_CHECKSUM);
c93cf2d7
DM		 1699 } else
1700 return -1;
1701 }
5f3633e3
JK		 1702 if (m->flags & MOPT_CLEAR_ERR)
1703 clear_opt(sb, ERRORS_MASK);
1704 if (token == Opt_noquota && sb_any_quota_loaded(sb)) {
1705 ext4_msg(sb, KERN_ERR, "Cannot change quota "
1706 "options when quota turned on");
1707 return -1;
1708 }
1709
1710 if (m->flags & MOPT_NOSUPPORT) {
1711 ext4_msg(sb, KERN_ERR, "%s option not supported", opt);
1712 } else if (token == Opt_commit) {
1713 if (arg == 0)
1714 arg = JBD2_DEFAULT_MAX_COMMIT_AGE;
1715 sbi->s_commit_interval = HZ * arg;
670e9875
TT		 1716 } else if (token == Opt_debug_want_extra_isize) {
1717 sbi->s_want_extra_isize = arg;
5f3633e3 1718 } else if (token == Opt_max_batch_time) {
5f3633e3
JK		 1719 sbi->s_max_batch_time = arg;
1720 } else if (token == Opt_min_batch_time) {
1721 sbi->s_min_batch_time = arg;
1722 } else if (token == Opt_inode_readahead_blks) {
e33e60ea
JK		 1723 if (arg && (arg > (1 << 30) || !is_power_of_2(arg))) {
1724 ext4_msg(sb, KERN_ERR,
1725 "EXT4-fs: inode_readahead_blks must be "
1726 "0 or a power of 2 smaller than 2^31");
26092bf5 1727 return -1;
5f3633e3
JK		 1728 }
1729 sbi->s_inode_readahead_blks = arg;
1730 } else if (token == Opt_init_itable) {
1731 set_opt(sb, INIT_INODE_TABLE);
1732 if (!args->from)
1733 arg = EXT4_DEF_LI_WAIT_MULT;
1734 sbi->s_li_wait_mult = arg;
1735 } else if (token == Opt_max_dir_size_kb) {
1736 sbi->s_max_dir_size_kb = arg;
1737 } else if (token == Opt_stripe) {
1738 sbi->s_stripe = arg;
1739 } else if (token == Opt_resuid) {
1740 uid = make_kuid(current_user_ns(), arg);
1741 if (!uid_valid(uid)) {
1742 ext4_msg(sb, KERN_ERR, "Invalid uid value %d", arg);
26092bf5
TT		 1743 return -1;
1744 }
5f3633e3
JK		 1745 sbi->s_resuid = uid;
1746 } else if (token == Opt_resgid) {
1747 gid = make_kgid(current_user_ns(), arg);
1748 if (!gid_valid(gid)) {
1749 ext4_msg(sb, KERN_ERR, "Invalid gid value %d", arg);
1750 return -1;
1751 }
1752 sbi->s_resgid = gid;
1753 } else if (token == Opt_journal_dev) {
1754 if (is_remount) {
1755 ext4_msg(sb, KERN_ERR,
1756 "Cannot specify journal on remount");
1757 return -1;
1758 }
1759 *journal_devnum = arg;
ad4eec61
ES		 1760 } else if (token == Opt_journal_path) {
1761 char *journal_path;
1762 struct inode *journal_inode;
1763 struct path path;
1764 int error;
1765
1766 if (is_remount) {
1767 ext4_msg(sb, KERN_ERR,
1768 "Cannot specify journal on remount");
1769 return -1;
1770 }
1771 journal_path = match_strdup(&args[0]);
1772 if (!journal_path) {
1773 ext4_msg(sb, KERN_ERR, "error: could not dup "
1774 "journal device string");
1775 return -1;
1776 }
1777
1778 error = kern_path(journal_path, LOOKUP_FOLLOW, &path);
1779 if (error) {
1780 ext4_msg(sb, KERN_ERR, "error: could not find "
1781 "journal device path: error %d", error);
1782 kfree(journal_path);
1783 return -1;
1784 }
1785
2b0143b5 1786 journal_inode = d_inode(path.dentry);
ad4eec61
ES		 1787 if (!S_ISBLK(journal_inode->i_mode)) {
1788 ext4_msg(sb, KERN_ERR, "error: journal path %s "
1789 "is not a block device", journal_path);
1790 path_put(&path);
1791 kfree(journal_path);
1792 return -1;
1793 }
1794
1795 *journal_devnum = new_encode_dev(journal_inode->i_rdev);
1796 path_put(&path);
1797 kfree(journal_path);
5f3633e3
JK		 1798 } else if (token == Opt_journal_ioprio) {
1799 if (arg > 7) {
1800 ext4_msg(sb, KERN_ERR, "Invalid journal IO priority"
1801 " (must be 0-7)");
1802 return -1;
1803 }
1804 *journal_ioprio =
1805 IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, arg);
6ddb2447
TT		 1806 } else if (token == Opt_test_dummy_encryption) {
1807#ifdef CONFIG_EXT4_FS_ENCRYPTION
1808 sbi->s_mount_flags |= EXT4_MF_TEST_DUMMY_ENCRYPTION;
1809 ext4_msg(sb, KERN_WARNING,
1810 "Test dummy encryption mode enabled");
1811#else
1812 ext4_msg(sb, KERN_WARNING,
1813 "Test dummy encryption mount option ignored");
1814#endif
5f3633e3
JK		 1815 } else if (m->flags & MOPT_DATAJ) {
1816 if (is_remount) {
1817 if (!sbi->s_journal)
1818 ext4_msg(sb, KERN_WARNING, "Remounting file system with no journal so ignoring journalled data option");
1819 else if (test_opt(sb, DATA_FLAGS) != m->mount_opt) {
0efb3b23 1820 ext4_msg(sb, KERN_ERR,
26092bf5 1821 "Cannot change data mode on remount");
26092bf5 1822 return -1;
ac27a0ec 1823 }
26092bf5 1824 } else {
5f3633e3
JK		 1825 clear_opt(sb, DATA_FLAGS);
1826 sbi->s_mount_opt |= m->mount_opt;
ac27a0ec 1827 }
5f3633e3
JK		 1828#ifdef CONFIG_QUOTA
1829 } else if (m->flags & MOPT_QFMT) {
1830 if (sb_any_quota_loaded(sb) &&
1831 sbi->s_jquota_fmt != m->mount_opt) {
1832 ext4_msg(sb, KERN_ERR, "Cannot change journaled "
1833 "quota options when quota turned on");
1834 return -1;
1835 }
e2b911c5 1836 if (ext4_has_feature_quota(sb)) {
c325a67c
TT		 1837 ext4_msg(sb, KERN_INFO,
1838 "Quota format mount options ignored "
262b4662 1839 "when QUOTA feature is enabled");
c325a67c 1840 return 1;
262b4662 1841 }
5f3633e3 1842 sbi->s_jquota_fmt = m->mount_opt;
923ae0ff 1843#endif
923ae0ff 1844 } else if (token == Opt_dax) {
ef83b6e8
DW		 1845#ifdef CONFIG_FS_DAX
1846 ext4_msg(sb, KERN_WARNING,
1847 "DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
1848 sbi->s_mount_opt |= m->mount_opt;
1849#else
923ae0ff
RZ		 1850 ext4_msg(sb, KERN_INFO, "dax option not supported");
1851 return -1;
5f3633e3 1852#endif
7915a861
AN		 1853 } else if (token == Opt_data_err_abort) {
1854 sbi->s_mount_opt |= m->mount_opt;
1855 } else if (token == Opt_data_err_ignore) {
1856 sbi->s_mount_opt &= ~m->mount_opt;
5f3633e3
JK		 1857 } else {
1858 if (!args->from)
1859 arg = 1;
1860 if (m->flags & MOPT_CLEAR)
1861 arg = !arg;
1862 else if (unlikely(!(m->flags & MOPT_SET))) {
1863 ext4_msg(sb, KERN_WARNING,
1864 "buggy handling of option %s", opt);
1865 WARN_ON(1);
1866 return -1;
1867 }
1868 if (arg != 0)
1869 sbi->s_mount_opt |= m->mount_opt;
1870 else
1871 sbi->s_mount_opt &= ~m->mount_opt;
26092bf5 1872 }
5f3633e3 1873 return 1;
26092bf5
TT		 1874}
1875
1876static int parse_options(char *options, struct super_block *sb,
1877 unsigned long *journal_devnum,
1878 unsigned int *journal_ioprio,
1879 int is_remount)
1880{
1881 struct ext4_sb_info *sbi = EXT4_SB(sb);
1882 char *p;
1883 substring_t args[MAX_OPT_ARGS];
1884 int token;
1885
1886 if (!options)
1887 return 1;
1888
1889 while ((p = strsep(&options, ",")) != NULL) {
1890 if (!*p)
1891 continue;
1892 /*
1893 * Initialize args struct so we know whether arg was
1894 * found; some options take optional arguments.
1895 */
caecd0af 1896 args[0].to = args[0].from = NULL;
26092bf5
TT		 1897 token = match_token(p, tokens, args);
1898 if (handle_mount_opt(sb, p, token, args, journal_devnum,
1899 journal_ioprio, is_remount) < 0)
1900 return 0;
ac27a0ec
DK		 1901 }
1902#ifdef CONFIG_QUOTA
49da9392
JK		 1903 /*
1904 * We do the test below only for project quotas. 'usrquota' and
1905 * 'grpquota' mount options are allowed even without quota feature
1906 * to support legacy quotas in quota files.
1907 */
1908 if (test_opt(sb, PRJQUOTA) && !ext4_has_feature_project(sb)) {
1909 ext4_msg(sb, KERN_ERR, "Project quota feature not enabled. "
1910 "Cannot enable project quota enforcement.");
1911 return 0;
1912 }
1913 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
482a7425 1914 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
fd8c37ec 1915 clear_opt(sb, USRQUOTA);
ac27a0ec 1916
482a7425 1917 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
fd8c37ec 1918 clear_opt(sb, GRPQUOTA);
ac27a0ec 1919
56c50f11 1920 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
b31e1552
ES		 1921 ext4_msg(sb, KERN_ERR, "old and new quota "
1922 "format mixing");
ac27a0ec
DK		 1923 return 0;
1924 }
1925
1926 if (!sbi->s_jquota_fmt) {
b31e1552
ES		 1927 ext4_msg(sb, KERN_ERR, "journaled quota format "
1928 "not specified");
ac27a0ec
DK		 1929 return 0;
1930 }
ac27a0ec
DK		 1931 }
1932#endif
261cb20c
JK		 1933 if (test_opt(sb, DIOREAD_NOLOCK)) {
1934 int blocksize =
1935 BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);
1936
09cbfeaf 1937 if (blocksize < PAGE_SIZE) {
261cb20c
JK		 1938 ext4_msg(sb, KERN_ERR, "can't mount with "
1939 "dioread_nolock if block size != PAGE_SIZE");
1940 return 0;
1941 }
1942 }
ac27a0ec
DK		 1943 return 1;
1944}
1945
2adf6da8
TT		 1946static inline void ext4_show_quota_options(struct seq_file *seq,
1947 struct super_block *sb)
1948{
1949#if defined(CONFIG_QUOTA)
1950 struct ext4_sb_info *sbi = EXT4_SB(sb);
1951
1952 if (sbi->s_jquota_fmt) {
1953 char *fmtname = "";
1954
1955 switch (sbi->s_jquota_fmt) {
1956 case QFMT_VFS_OLD:
1957 fmtname = "vfsold";
1958 break;
1959 case QFMT_VFS_V0:
1960 fmtname = "vfsv0";
1961 break;
1962 case QFMT_VFS_V1:
1963 fmtname = "vfsv1";
1964 break;
1965 }
1966 seq_printf(seq, ",jqfmt=%s", fmtname);
1967 }
1968
1969 if (sbi->s_qf_names[USRQUOTA])
a068acf2 1970 seq_show_option(seq, "usrjquota", sbi->s_qf_names[USRQUOTA]);
2adf6da8
TT		 1971
1972 if (sbi->s_qf_names[GRPQUOTA])
a068acf2 1973 seq_show_option(seq, "grpjquota", sbi->s_qf_names[GRPQUOTA]);
2adf6da8
TT		 1974#endif
1975}
1976
5a916be1
TT		 1977static const char *token2str(int token)
1978{
50df9fd5 1979 const struct match_token *t;
5a916be1
TT		 1980
1981 for (t = tokens; t->token != Opt_err; t++)
1982 if (t->token == token && !strchr(t->pattern, '='))
1983 break;
1984 return t->pattern;
1985}
1986
2adf6da8
TT		 1987/*
1988 * Show an option if
1989 * - it's set to a non-default value OR
1990 * - if the per-sb default is different from the global default
1991 */
66acdcf4
TT		 1992static int _ext4_show_options(struct seq_file *seq, struct super_block *sb,
1993 int nodefs)
2adf6da8 1994{
2adf6da8
TT		 1995 struct ext4_sb_info *sbi = EXT4_SB(sb);
1996 struct ext4_super_block *es = sbi->s_es;
66acdcf4 1997 int def_errors, def_mount_opt = nodefs ? 0 : sbi->s_def_mount_opt;
5a916be1 1998 const struct mount_opts *m;
66acdcf4 1999 char sep = nodefs ? '\n' : ',';
2adf6da8 2000
66acdcf4
TT		 2001#define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep)
2002#define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg)
2adf6da8
TT		 2003
2004 if (sbi->s_sb_block != 1)
5a916be1
TT		 2005 SEQ_OPTS_PRINT("sb=%llu", sbi->s_sb_block);
2006
2007 for (m = ext4_mount_opts; m->token != Opt_err; m++) {
2008 int want_set = m->flags & MOPT_SET;
2009 if (((m->flags & (MOPT_SET|MOPT_CLEAR)) == 0) ||
2010 (m->flags & MOPT_CLEAR_ERR))
2011 continue;
66acdcf4 2012 if (!(m->mount_opt & (sbi->s_mount_opt ^ def_mount_opt)))
5a916be1
TT		 2013 continue; /* skip if same as the default */
2014 if ((want_set &&
2015 (sbi->s_mount_opt & m->mount_opt) != m->mount_opt) ||
2016 (!want_set && (sbi->s_mount_opt & m->mount_opt)))
2017 continue; /* select Opt_noFoo vs Opt_Foo */
2018 SEQ_OPTS_PRINT("%s", token2str(m->token));
2adf6da8 2019 }
5a916be1 2020
08cefc7a 2021 if (nodefs || !uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT4_DEF_RESUID)) ||
5a916be1 2022 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID)
08cefc7a
EB		 2023 SEQ_OPTS_PRINT("resuid=%u",
2024 from_kuid_munged(&init_user_ns, sbi->s_resuid));
2025 if (nodefs || !gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT4_DEF_RESGID)) ||
5a916be1 2026 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID)
08cefc7a
EB		 2027 SEQ_OPTS_PRINT("resgid=%u",
2028 from_kgid_munged(&init_user_ns, sbi->s_resgid));
66acdcf4 2029 def_errors = nodefs ? -1 : le16_to_cpu(es->s_errors);
5a916be1
TT		 2030 if (test_opt(sb, ERRORS_RO) && def_errors != EXT4_ERRORS_RO)
2031 SEQ_OPTS_PUTS("errors=remount-ro");
2adf6da8 2032 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
5a916be1 2033 SEQ_OPTS_PUTS("errors=continue");
2adf6da8 2034 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
5a916be1 2035 SEQ_OPTS_PUTS("errors=panic");
66acdcf4 2036 if (nodefs || sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ)
5a916be1 2037 SEQ_OPTS_PRINT("commit=%lu", sbi->s_commit_interval / HZ);
66acdcf4 2038 if (nodefs || sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME)
5a916be1 2039 SEQ_OPTS_PRINT("min_batch_time=%u", sbi->s_min_batch_time);
66acdcf4 2040 if (nodefs || sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME)
5a916be1 2041 SEQ_OPTS_PRINT("max_batch_time=%u", sbi->s_max_batch_time);
2adf6da8 2042 if (sb->s_flags & MS_I_VERSION)
5a916be1 2043 SEQ_OPTS_PUTS("i_version");
66acdcf4 2044 if (nodefs || sbi->s_stripe)
5a916be1 2045 SEQ_OPTS_PRINT("stripe=%lu", sbi->s_stripe);
66acdcf4 2046 if (EXT4_MOUNT_DATA_FLAGS & (sbi->s_mount_opt ^ def_mount_opt)) {
5a916be1
TT		 2047 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
2048 SEQ_OPTS_PUTS("data=journal");
2049 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
2050 SEQ_OPTS_PUTS("data=ordered");
2051 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
2052 SEQ_OPTS_PUTS("data=writeback");
2053 }
66acdcf4
TT		 2054 if (nodefs ||
2055 sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
5a916be1
TT		 2056 SEQ_OPTS_PRINT("inode_readahead_blks=%u",
2057 sbi->s_inode_readahead_blks);
2adf6da8 2058
66acdcf4
TT		 2059 if (nodefs || (test_opt(sb, INIT_INODE_TABLE) &&
2060 (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT)))
5a916be1 2061 SEQ_OPTS_PRINT("init_itable=%u", sbi->s_li_wait_mult);
df981d03
TT		 2062 if (nodefs || sbi->s_max_dir_size_kb)
2063 SEQ_OPTS_PRINT("max_dir_size_kb=%u", sbi->s_max_dir_size_kb);
7915a861
AN		 2064 if (test_opt(sb, DATA_ERR_ABORT))
2065 SEQ_OPTS_PUTS("data_err=abort");
2adf6da8
TT		 2066
2067 ext4_show_quota_options(seq, sb);
2adf6da8
TT		 2068 return 0;
2069}
2070
66acdcf4
TT		 2071static int ext4_show_options(struct seq_file *seq, struct dentry *root)
2072{
2073 return _ext4_show_options(seq, root->d_sb, 0);
2074}
2075
ebd173be 2076int ext4_seq_options_show(struct seq_file *seq, void *offset)
66acdcf4
TT		 2077{
2078 struct super_block *sb = seq->private;
2079 int rc;
2080
2081 seq_puts(seq, (sb->s_flags & MS_RDONLY) ? "ro" : "rw");
2082 rc = _ext4_show_options(seq, sb, 1);
2083 seq_puts(seq, "\n");
2084 return rc;
2085}
2086
617ba13b 2087static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
ac27a0ec
DK		 2088 int read_only)
2089{
617ba13b 2090 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec
DK		 2091 int res = 0;
2092
617ba13b 2093 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
b31e1552
ES		 2094 ext4_msg(sb, KERN_ERR, "revision level too high, "
2095 "forcing read-only mode");
ac27a0ec
DK		 2096 res = MS_RDONLY;
2097 }
2098 if (read_only)
281b5995 2099 goto done;
617ba13b 2100 if (!(sbi->s_mount_state & EXT4_VALID_FS))
b31e1552
ES		 2101 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
2102 "running e2fsck is recommended");
c8b459f4 2103 else if (sbi->s_mount_state & EXT4_ERROR_FS)
b31e1552
ES		 2104 ext4_msg(sb, KERN_WARNING,
2105 "warning: mounting fs with errors, "
2106 "running e2fsck is recommended");
ed3ce80a 2107 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
ac27a0ec
DK		 2108 le16_to_cpu(es->s_mnt_count) >=
2109 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
b31e1552
ES		 2110 ext4_msg(sb, KERN_WARNING,
2111 "warning: maximal mount count reached, "
2112 "running e2fsck is recommended");
ac27a0ec
DK		 2113 else if (le32_to_cpu(es->s_checkinterval) &&
2114 (le32_to_cpu(es->s_lastcheck) +
2115 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
b31e1552
ES		 2116 ext4_msg(sb, KERN_WARNING,
2117 "warning: checktime reached, "
2118 "running e2fsck is recommended");
0b8e58a1 2119 if (!sbi->s_journal)
0390131b 2120 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
ac27a0ec 2121 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
617ba13b 2122 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
e8546d06 2123 le16_add_cpu(&es->s_mnt_count, 1);
ac27a0ec 2124 es->s_mtime = cpu_to_le32(get_seconds());
617ba13b 2125 ext4_update_dynamic_rev(sb);
0390131b 2126 if (sbi->s_journal)
e2b911c5 2127 ext4_set_feature_journal_needs_recovery(sb);
ac27a0ec 2128
e2d67052 2129 ext4_commit_super(sb, 1);
281b5995 2130done:
ac27a0ec 2131 if (test_opt(sb, DEBUG))
a9df9a49 2132 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
a2595b8a 2133 "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
ac27a0ec
DK		 2134 sb->s_blocksize,
2135 sbi->s_groups_count,
617ba13b
MC		 2136 EXT4_BLOCKS_PER_GROUP(sb),
2137 EXT4_INODES_PER_GROUP(sb),
a2595b8a 2138 sbi->s_mount_opt, sbi->s_mount_opt2);
ac27a0ec 2139
7abc52c2 2140 cleancache_init_fs(sb);
ac27a0ec
DK		 2141 return res;
2142}
2143
117fff10
TT		 2144int ext4_alloc_flex_bg_array(struct super_block *sb, ext4_group_t ngroup)
2145{
2146 struct ext4_sb_info *sbi = EXT4_SB(sb);
2147 struct flex_groups *new_groups;
2148 int size;
2149
2150 if (!sbi->s_log_groups_per_flex)
2151 return 0;
2152
2153 size = ext4_flex_group(sbi, ngroup - 1) + 1;
2154 if (size <= sbi->s_flex_groups_allocated)
2155 return 0;
2156
2157 size = roundup_pow_of_two(size * sizeof(struct flex_groups));
2158 new_groups = ext4_kvzalloc(size, GFP_KERNEL);
2159 if (!new_groups) {
2160 ext4_msg(sb, KERN_ERR, "not enough memory for %d flex groups",
2161 size / (int) sizeof(struct flex_groups));
2162 return -ENOMEM;
2163 }
2164
2165 if (sbi->s_flex_groups) {
2166 memcpy(new_groups, sbi->s_flex_groups,
2167 (sbi->s_flex_groups_allocated *
2168 sizeof(struct flex_groups)));
b93b41d4 2169 kvfree(sbi->s_flex_groups);
117fff10
TT		 2170 }
2171 sbi->s_flex_groups = new_groups;
2172 sbi->s_flex_groups_allocated = size / sizeof(struct flex_groups);
2173 return 0;
2174}
2175
772cb7c8
JS		 2176static int ext4_fill_flex_info(struct super_block *sb)
2177{
2178 struct ext4_sb_info *sbi = EXT4_SB(sb);
2179 struct ext4_group_desc *gdp = NULL;
772cb7c8 2180 ext4_group_t flex_group;
117fff10 2181 int i, err;
772cb7c8 2182
503358ae 2183 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
d50f2ab6 2184 if (sbi->s_log_groups_per_flex < 1 || sbi->s_log_groups_per_flex > 31) {
772cb7c8
JS		 2185 sbi->s_log_groups_per_flex = 0;
2186 return 1;
2187 }
2188
117fff10
TT		 2189 err = ext4_alloc_flex_bg_array(sb, sbi->s_groups_count);
2190 if (err)
9933fc0a 2191 goto failed;
772cb7c8 2192
772cb7c8 2193 for (i = 0; i < sbi->s_groups_count; i++) {
88b6edd1 2194 gdp = ext4_get_group_desc(sb, i, NULL);
772cb7c8
JS		 2195
2196 flex_group = ext4_flex_group(sbi, i);
7ad9bb65
TT		 2197 atomic_add(ext4_free_inodes_count(sb, gdp),
2198 &sbi->s_flex_groups[flex_group].free_inodes);
90ba983f
TT		 2199 atomic64_add(ext4_free_group_clusters(sb, gdp),
2200 &sbi->s_flex_groups[flex_group].free_clusters);
7ad9bb65
TT		 2201 atomic_add(ext4_used_dirs_count(sb, gdp),
2202 &sbi->s_flex_groups[flex_group].used_dirs);
772cb7c8
JS		 2203 }
2204
2205 return 1;
2206failed:
2207 return 0;
2208}
2209
e2b911c5 2210static __le16 ext4_group_desc_csum(struct super_block *sb, __u32 block_group,
feb0ab32 2211 struct ext4_group_desc *gdp)
717d50e4 2212{
b47820ed 2213 int offset = offsetof(struct ext4_group_desc, bg_checksum);
717d50e4 2214 __u16 crc = 0;
feb0ab32 2215 __le32 le_group = cpu_to_le32(block_group);
e2b911c5 2216 struct ext4_sb_info *sbi = EXT4_SB(sb);
717d50e4 2217
9aa5d32b 2218 if (ext4_has_metadata_csum(sbi->s_sb)) {
feb0ab32 2219 /* Use new metadata_csum algorithm */
feb0ab32 2220 __u32 csum32;
b47820ed 2221 __u16 dummy_csum = 0;
feb0ab32 2222
feb0ab32
DW		 2223 csum32 = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&le_group,
2224 sizeof(le_group));
b47820ed
DJ		 2225 csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp, offset);
2226 csum32 = ext4_chksum(sbi, csum32, (__u8 *)&dummy_csum,
2227 sizeof(dummy_csum));
2228 offset += sizeof(dummy_csum);
2229 if (offset < sbi->s_desc_size)
2230 csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp + offset,
2231 sbi->s_desc_size - offset);
feb0ab32
DW		 2232
2233 crc = csum32 & 0xFFFF;
2234 goto out;
717d50e4
AD		 2235 }
2236
feb0ab32 2237 /* old crc16 code */
e2b911c5 2238 if (!ext4_has_feature_gdt_csum(sb))
813d32f9
DW		 2239 return 0;
2240
feb0ab32
DW		 2241 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
2242 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
2243 crc = crc16(crc, (__u8 *)gdp, offset);
2244 offset += sizeof(gdp->bg_checksum); /* skip checksum */
2245 /* for checksum of struct ext4_group_desc do the rest...*/
e2b911c5 2246 if (ext4_has_feature_64bit(sb) &&
feb0ab32
DW		 2247 offset < le16_to_cpu(sbi->s_es->s_desc_size))
2248 crc = crc16(crc, (__u8 *)gdp + offset,
2249 le16_to_cpu(sbi->s_es->s_desc_size) -
2250 offset);
2251
2252out:
717d50e4
AD		 2253 return cpu_to_le16(crc);
2254}
2255
feb0ab32 2256int ext4_group_desc_csum_verify(struct super_block *sb, __u32 block_group,
717d50e4
AD		 2257 struct ext4_group_desc *gdp)
2258{
feb0ab32 2259 if (ext4_has_group_desc_csum(sb) &&
e2b911c5 2260 (gdp->bg_checksum != ext4_group_desc_csum(sb, block_group, gdp)))
717d50e4
AD		 2261 return 0;
2262
2263 return 1;
2264}
2265
feb0ab32
DW		 2266void ext4_group_desc_csum_set(struct super_block *sb, __u32 block_group,
2267 struct ext4_group_desc *gdp)
2268{
2269 if (!ext4_has_group_desc_csum(sb))
2270 return;
e2b911c5 2271 gdp->bg_checksum = ext4_group_desc_csum(sb, block_group, gdp);
feb0ab32
DW		 2272}
2273
ac27a0ec 2274/* Called at mount-time, super-block is locked */
bfff6873 2275static int ext4_check_descriptors(struct super_block *sb,
829fa70d 2276 ext4_fsblk_t sb_block,
bfff6873 2277 ext4_group_t *first_not_zeroed)
ac27a0ec 2278{
617ba13b
MC		 2279 struct ext4_sb_info *sbi = EXT4_SB(sb);
2280 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
2281 ext4_fsblk_t last_block;
bd81d8ee
LV		 2282 ext4_fsblk_t block_bitmap;
2283 ext4_fsblk_t inode_bitmap;
2284 ext4_fsblk_t inode_table;
ce421581 2285 int flexbg_flag = 0;
bfff6873 2286 ext4_group_t i, grp = sbi->s_groups_count;
ac27a0ec 2287
e2b911c5 2288 if (ext4_has_feature_flex_bg(sb))
ce421581
JS		 2289 flexbg_flag = 1;
2290
af5bc92d 2291 ext4_debug("Checking group descriptors");
ac27a0ec 2292
197cd65a
AM		 2293 for (i = 0; i < sbi->s_groups_count; i++) {
2294 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
2295
ce421581 2296 if (i == sbi->s_groups_count - 1 || flexbg_flag)
bd81d8ee 2297 last_block = ext4_blocks_count(sbi->s_es) - 1;
ac27a0ec
DK		 2298 else
2299 last_block = first_block +
617ba13b 2300 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
ac27a0ec 2301
bfff6873
LC		 2302 if ((grp == sbi->s_groups_count) &&
2303 !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2304 grp = i;
2305
8fadc143 2306 block_bitmap = ext4_block_bitmap(sb, gdp);
829fa70d
TT		 2307 if (block_bitmap == sb_block) {
2308 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2309 "Block bitmap for group %u overlaps "
2310 "superblock", i);
2311 }
2b2d6d01 2312 if (block_bitmap < first_block || block_bitmap > last_block) {
b31e1552 2313 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2314 "Block bitmap for group %u not in group "
b31e1552 2315 "(block %llu)!", i, block_bitmap);
ac27a0ec
DK		 2316 return 0;
2317 }
8fadc143 2318 inode_bitmap = ext4_inode_bitmap(sb, gdp);
829fa70d
TT		 2319 if (inode_bitmap == sb_block) {
2320 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2321 "Inode bitmap for group %u overlaps "
2322 "superblock", i);
2323 }
2b2d6d01 2324 if (inode_bitmap < first_block || inode_bitmap > last_block) {
b31e1552 2325 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2326 "Inode bitmap for group %u not in group "
b31e1552 2327 "(block %llu)!", i, inode_bitmap);
ac27a0ec
DK		 2328 return 0;
2329 }
8fadc143 2330 inode_table = ext4_inode_table(sb, gdp);
829fa70d
TT		 2331 if (inode_table == sb_block) {
2332 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2333 "Inode table for group %u overlaps "
2334 "superblock", i);
2335 }
bd81d8ee 2336 if (inode_table < first_block ||
2b2d6d01 2337 inode_table + sbi->s_itb_per_group - 1 > last_block) {
b31e1552 2338 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2339 "Inode table for group %u not in group "
b31e1552 2340 "(block %llu)!", i, inode_table);
ac27a0ec
DK		 2341 return 0;
2342 }
955ce5f5 2343 ext4_lock_group(sb, i);
feb0ab32 2344 if (!ext4_group_desc_csum_verify(sb, i, gdp)) {
b31e1552
ES		 2345 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2346 "Checksum for group %u failed (%u!=%u)",
e2b911c5 2347 i, le16_to_cpu(ext4_group_desc_csum(sb, i,
b31e1552 2348 gdp)), le16_to_cpu(gdp->bg_checksum));
7ee1ec4c 2349 if (!(sb->s_flags & MS_RDONLY)) {
955ce5f5 2350 ext4_unlock_group(sb, i);
8a266467 2351 return 0;
7ee1ec4c 2352 }
717d50e4 2353 }
955ce5f5 2354 ext4_unlock_group(sb, i);
ce421581
JS		 2355 if (!flexbg_flag)
2356 first_block += EXT4_BLOCKS_PER_GROUP(sb);
ac27a0ec 2357 }
bfff6873
LC		 2358 if (NULL != first_not_zeroed)
2359 *first_not_zeroed = grp;
ac27a0ec
DK		 2360 return 1;
2361}
2362
617ba13b 2363/* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
ac27a0ec
DK		 2364 * the superblock) which were deleted from all directories, but held open by
2365 * a process at the time of a crash. We walk the list and try to delete these
2366 * inodes at recovery time (only with a read-write filesystem).
2367 *
2368 * In order to keep the orphan inode chain consistent during traversal (in
2369 * case of crash during recovery), we link each inode into the superblock
2370 * orphan list_head and handle it the same way as an inode deletion during
2371 * normal operation (which journals the operations for us).
2372 *
2373 * We only do an iget() and an iput() on each inode, which is very safe if we
2374 * accidentally point at an in-use or already deleted inode. The worst that
2375 * can happen in this case is that we get a "bit already cleared" message from
617ba13b 2376 * ext4_free_inode(). The only reason we would point at a wrong inode is if
ac27a0ec
DK		 2377 * e2fsck was run on this filesystem, and it must have already done the orphan
2378 * inode cleanup for us, so we can safely abort without any further action.
2379 */
2b2d6d01
TT		 2380static void ext4_orphan_cleanup(struct super_block *sb,
2381 struct ext4_super_block *es)
ac27a0ec
DK		 2382{
2383 unsigned int s_flags = sb->s_flags;
2c98eb5e 2384 int ret, nr_orphans = 0, nr_truncates = 0;
ac27a0ec
DK		 2385#ifdef CONFIG_QUOTA
2386 int i;
2387#endif
2388 if (!es->s_last_orphan) {
2389 jbd_debug(4, "no orphan inodes to clean up\n");
2390 return;
2391 }
2392
a8f48a95 2393 if (bdev_read_only(sb->s_bdev)) {
b31e1552
ES		 2394 ext4_msg(sb, KERN_ERR, "write access "
2395 "unavailable, skipping orphan cleanup");
a8f48a95
ES		 2396 return;
2397 }
2398
d39195c3
AG		 2399 /* Check if feature set would not allow a r/w mount */
2400 if (!ext4_feature_set_ok(sb, 0)) {
2401 ext4_msg(sb, KERN_INFO, "Skipping orphan cleanup due to "
2402 "unknown ROCOMPAT features");
2403 return;
2404 }
2405
617ba13b 2406 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
c25f9bc6
ES		 2407 /* don't clear list on RO mount w/ errors */
2408 if (es->s_last_orphan && !(s_flags & MS_RDONLY)) {
84474976 2409 ext4_msg(sb, KERN_INFO, "Errors on filesystem, "
ac27a0ec 2410 "clearing orphan list.\n");
c25f9bc6
ES		 2411 es->s_last_orphan = 0;
2412 }
ac27a0ec
DK		 2413 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2414 return;
2415 }
2416
2417 if (s_flags & MS_RDONLY) {
b31e1552 2418 ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
ac27a0ec
DK		 2419 sb->s_flags &= ~MS_RDONLY;
2420 }
2421#ifdef CONFIG_QUOTA
2422 /* Needed for iput() to work correctly and not trash data */
2423 sb->s_flags |= MS_ACTIVE;
2424 /* Turn on quotas so that they are updated correctly */
a2d4a646 2425 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
617ba13b
MC		 2426 if (EXT4_SB(sb)->s_qf_names[i]) {
2427 int ret = ext4_quota_on_mount(sb, i);
ac27a0ec 2428 if (ret < 0)
b31e1552
ES		 2429 ext4_msg(sb, KERN_ERR,
2430 "Cannot turn on journaled "
2431 "quota: error %d", ret);
ac27a0ec
DK		 2432 }
2433 }
2434#endif
2435
2436 while (es->s_last_orphan) {
2437 struct inode *inode;
2438
c65d5c6c
VN		 2439 /*
2440 * We may have encountered an error during cleanup; if
2441 * so, skip the rest.
2442 */
2443 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
2444 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2445 es->s_last_orphan = 0;
2446 break;
2447 }
2448
97bd42b9
JB		 2449 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
2450 if (IS_ERR(inode)) {
ac27a0ec
DK		 2451 es->s_last_orphan = 0;
2452 break;
2453 }
2454
617ba13b 2455 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
871a2931 2456 dquot_initialize(inode);
ac27a0ec 2457 if (inode->i_nlink) {
566370a2
PT		 2458 if (test_opt(sb, DEBUG))
2459 ext4_msg(sb, KERN_DEBUG,
2460 "%s: truncating inode %lu to %lld bytes",
2461 __func__, inode->i_ino, inode->i_size);
e5f8eab8 2462 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
ac27a0ec 2463 inode->i_ino, inode->i_size);
5955102c 2464 inode_lock(inode);
55f252c9 2465 truncate_inode_pages(inode->i_mapping, inode->i_size);
2c98eb5e
TT		 2466 ret = ext4_truncate(inode);
2467 if (ret)
2468 ext4_std_error(inode->i_sb, ret);
5955102c 2469 inode_unlock(inode);
ac27a0ec
DK		 2470 nr_truncates++;
2471 } else {
566370a2
PT		 2472 if (test_opt(sb, DEBUG))
2473 ext4_msg(sb, KERN_DEBUG,
2474 "%s: deleting unreferenced inode %lu",
2475 __func__, inode->i_ino);
ac27a0ec
DK		 2476 jbd_debug(2, "deleting unreferenced inode %lu\n",
2477 inode->i_ino);
2478 nr_orphans++;
2479 }
2480 iput(inode); /* The delete magic happens here! */
2481 }
2482
2b2d6d01 2483#define PLURAL(x) (x), ((x) == 1) ? "" : "s"
ac27a0ec
DK		 2484
2485 if (nr_orphans)
b31e1552
ES		 2486 ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
2487 PLURAL(nr_orphans));
ac27a0ec 2488 if (nr_truncates)
b31e1552
ES		 2489 ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
2490 PLURAL(nr_truncates));
ac27a0ec
DK		 2491#ifdef CONFIG_QUOTA
2492 /* Turn quotas off */
a2d4a646 2493 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
ac27a0ec 2494 if (sb_dqopt(sb)->files[i])
287a8095 2495 dquot_quota_off(sb, i);
ac27a0ec
DK		 2496 }
2497#endif
2498 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
2499}
0b8e58a1 2500
cd2291a4
ES		 2501/*
2502 * Maximal extent format file size.
2503 * Resulting logical blkno at s_maxbytes must fit in our on-disk
2504 * extent format containers, within a sector_t, and within i_blocks
2505 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
2506 * so that won't be a limiting factor.
2507 *
f17722f9
LC		 2508 * However there is other limiting factor. We do store extents in the form
2509 * of starting block and length, hence the resulting length of the extent
2510 * covering maximum file size must fit into on-disk format containers as
2511 * well. Given that length is always by 1 unit bigger than max unit (because
2512 * we count 0 as well) we have to lower the s_maxbytes by one fs block.
2513 *
cd2291a4
ES		 2514 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
2515 */
f287a1a5 2516static loff_t ext4_max_size(int blkbits, int has_huge_files)
cd2291a4
ES		 2517{
2518 loff_t res;
2519 loff_t upper_limit = MAX_LFS_FILESIZE;
2520
2521 /* small i_blocks in vfs inode? */
f287a1a5 2522 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
cd2291a4 2523 /*
90c699a9 2524 * CONFIG_LBDAF is not enabled implies the inode
cd2291a4
ES		 2525 * i_block represent total blocks in 512 bytes
2526 * 32 == size of vfs inode i_blocks * 8
2527 */
2528 upper_limit = (1LL << 32) - 1;
2529
2530 /* total blocks in file system block size */
2531 upper_limit >>= (blkbits - 9);
2532 upper_limit <<= blkbits;
2533 }
2534
f17722f9
LC		 2535 /*
2536 * 32-bit extent-start container, ee_block. We lower the maxbytes
2537 * by one fs block, so ee_len can cover the extent of maximum file
2538 * size
2539 */
2540 res = (1LL << 32) - 1;
cd2291a4 2541 res <<= blkbits;
cd2291a4
ES		 2542
2543 /* Sanity check against vm- & vfs- imposed limits */
2544 if (res > upper_limit)
2545 res = upper_limit;
2546
2547 return res;
2548}
ac27a0ec 2549
ac27a0ec 2550/*
cd2291a4 2551 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
0fc1b451
AK		 2552 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2553 * We need to be 1 filesystem block less than the 2^48 sector limit.
ac27a0ec 2554 */
f287a1a5 2555static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
ac27a0ec 2556{
617ba13b 2557 loff_t res = EXT4_NDIR_BLOCKS;
0fc1b451
AK		 2558 int meta_blocks;
2559 loff_t upper_limit;
0b8e58a1
AD		 2560 /* This is calculated to be the largest file size for a dense, block
2561 * mapped file such that the file's total number of 512-byte sectors,
2562 * including data and all indirect blocks, does not exceed (2^48 - 1).
2563 *
2564 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2565 * number of 512-byte sectors of the file.
0fc1b451
AK		 2566 */
2567
f287a1a5 2568 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
0fc1b451 2569 /*
90c699a9 2570 * !has_huge_files or CONFIG_LBDAF not enabled implies that
0b8e58a1
AD		 2571 * the inode i_block field represents total file blocks in
2572 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
0fc1b451
AK		 2573 */
2574 upper_limit = (1LL << 32) - 1;
2575
2576 /* total blocks in file system block size */
2577 upper_limit >>= (bits - 9);
2578
2579 } else {
8180a562
AK		 2580 /*
2581 * We use 48 bit ext4_inode i_blocks
2582 * With EXT4_HUGE_FILE_FL set the i_blocks
2583 * represent total number of blocks in
2584 * file system block size
2585 */
0fc1b451
AK		 2586 upper_limit = (1LL << 48) - 1;
2587
0fc1b451
AK		 2588 }
2589
2590 /* indirect blocks */
2591 meta_blocks = 1;
2592 /* double indirect blocks */
2593 meta_blocks += 1 + (1LL << (bits-2));
2594 /* tripple indirect blocks */
2595 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
2596
2597 upper_limit -= meta_blocks;
2598 upper_limit <<= bits;
ac27a0ec
DK		 2599
2600 res += 1LL << (bits-2);
2601 res += 1LL << (2*(bits-2));
2602 res += 1LL << (3*(bits-2));
2603 res <<= bits;
2604 if (res > upper_limit)
2605 res = upper_limit;
0fc1b451
AK		 2606
2607 if (res > MAX_LFS_FILESIZE)
2608 res = MAX_LFS_FILESIZE;
2609
ac27a0ec
DK		 2610 return res;
2611}
2612
617ba13b 2613static ext4_fsblk_t descriptor_loc(struct super_block *sb,
0b8e58a1 2614 ext4_fsblk_t logical_sb_block, int nr)
ac27a0ec 2615{
617ba13b 2616 struct ext4_sb_info *sbi = EXT4_SB(sb);
fd2d4291 2617 ext4_group_t bg, first_meta_bg;
ac27a0ec
DK		 2618 int has_super = 0;
2619
2620 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
2621
e2b911c5 2622 if (!ext4_has_feature_meta_bg(sb) || nr < first_meta_bg)
70bbb3e0 2623 return logical_sb_block + nr + 1;
ac27a0ec 2624 bg = sbi->s_desc_per_block * nr;
617ba13b 2625 if (ext4_bg_has_super(sb, bg))
ac27a0ec 2626 has_super = 1;
0b8e58a1 2627
bd63f6b0
DW		 2628 /*
2629 * If we have a meta_bg fs with 1k blocks, group 0's GDT is at
2630 * block 2, not 1. If s_first_data_block == 0 (bigalloc is enabled
2631 * on modern mke2fs or blksize > 1k on older mke2fs) then we must
2632 * compensate.
2633 */
2634 if (sb->s_blocksize == 1024 && nr == 0 &&
2635 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block) == 0)
2636 has_super++;
2637
617ba13b 2638 return (has_super + ext4_group_first_block_no(sb, bg));
ac27a0ec
DK		 2639}
2640
c9de560d
AT		 2641/**
2642 * ext4_get_stripe_size: Get the stripe size.
2643 * @sbi: In memory super block info
2644 *
2645 * If we have specified it via mount option, then
2646 * use the mount option value. If the value specified at mount time is
2647 * greater than the blocks per group use the super block value.
2648 * If the super block value is greater than blocks per group return 0.
2649 * Allocator needs it be less than blocks per group.
2650 *
2651 */
2652static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
2653{
2654 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
2655 unsigned long stripe_width =
2656 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
3eb08658 2657 int ret;
c9de560d
AT		 2658
2659 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
3eb08658 2660 ret = sbi->s_stripe;
5469d7c3 2661 else if (stripe_width && stripe_width <= sbi->s_blocks_per_group)
3eb08658 2662 ret = stripe_width;
5469d7c3 2663 else if (stride && stride <= sbi->s_blocks_per_group)
3eb08658
DE		 2664 ret = stride;
2665 else
2666 ret = 0;
c9de560d 2667
3eb08658
DE		 2668 /*
2669 * If the stripe width is 1, this makes no sense and
2670 * we set it to 0 to turn off stripe handling code.
2671 */
2672 if (ret <= 1)
2673 ret = 0;
c9de560d 2674
3eb08658 2675 return ret;
c9de560d 2676}
ac27a0ec 2677
a13fb1a4
ES		 2678/*
2679 * Check whether this filesystem can be mounted based on
2680 * the features present and the RDONLY/RDWR mount requested.
2681 * Returns 1 if this filesystem can be mounted as requested,
2682 * 0 if it cannot be.
2683 */
2684static int ext4_feature_set_ok(struct super_block *sb, int readonly)
2685{
e2b911c5 2686 if (ext4_has_unknown_ext4_incompat_features(sb)) {
a13fb1a4
ES		 2687 ext4_msg(sb, KERN_ERR,
2688 "Couldn't mount because of "
2689 "unsupported optional features (%x)",
2690 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
2691 ~EXT4_FEATURE_INCOMPAT_SUPP));
2692 return 0;
2693 }
2694
2695 if (readonly)
2696 return 1;
2697
e2b911c5 2698 if (ext4_has_feature_readonly(sb)) {
2cb5cc8b
DW		 2699 ext4_msg(sb, KERN_INFO, "filesystem is read-only");
2700 sb->s_flags |= MS_RDONLY;
2701 return 1;
2702 }
2703
a13fb1a4 2704 /* Check that feature set is OK for a read-write mount */
e2b911c5 2705 if (ext4_has_unknown_ext4_ro_compat_features(sb)) {
a13fb1a4
ES		 2706 ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of "
2707 "unsupported optional features (%x)",
2708 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
2709 ~EXT4_FEATURE_RO_COMPAT_SUPP));
2710 return 0;
2711 }
2712 /*
2713 * Large file size enabled file system can only be mounted
2714 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
2715 */
e2b911c5 2716 if (ext4_has_feature_huge_file(sb)) {
a13fb1a4
ES		 2717 if (sizeof(blkcnt_t) < sizeof(u64)) {
2718 ext4_msg(sb, KERN_ERR, "Filesystem with huge files "
2719 "cannot be mounted RDWR without "
2720 "CONFIG_LBDAF");
2721 return 0;
2722 }
2723 }
e2b911c5 2724 if (ext4_has_feature_bigalloc(sb) && !ext4_has_feature_extents(sb)) {
bab08ab9
TT		 2725 ext4_msg(sb, KERN_ERR,
2726 "Can't support bigalloc feature without "
2727 "extents feature\n");
2728 return 0;
2729 }
7c319d32
AK		 2730
2731#ifndef CONFIG_QUOTA
e2b911c5 2732 if (ext4_has_feature_quota(sb) && !readonly) {
7c319d32
AK		 2733 ext4_msg(sb, KERN_ERR,
2734 "Filesystem with quota feature cannot be mounted RDWR "
2735 "without CONFIG_QUOTA");
2736 return 0;
2737 }
689c958c
LX		 2738 if (ext4_has_feature_project(sb) && !readonly) {
2739 ext4_msg(sb, KERN_ERR,
2740 "Filesystem with project quota feature cannot be mounted RDWR "
2741 "without CONFIG_QUOTA");
2742 return 0;
2743 }
7c319d32 2744#endif /* CONFIG_QUOTA */
a13fb1a4
ES		 2745 return 1;
2746}
2747
66e61a9e
TT		 2748/*
2749 * This function is called once a day if we have errors logged
2750 * on the file system
2751 */
2752static void print_daily_error_info(unsigned long arg)
2753{
2754 struct super_block *sb = (struct super_block *) arg;
2755 struct ext4_sb_info *sbi;
2756 struct ext4_super_block *es;
2757
2758 sbi = EXT4_SB(sb);
2759 es = sbi->s_es;
2760
2761 if (es->s_error_count)
ae0f78de
TT		 2762 /* fsck newer than v1.41.13 is needed to clean this condition. */
2763 ext4_msg(sb, KERN_NOTICE, "error count since last fsck: %u",
66e61a9e
TT		 2764 le32_to_cpu(es->s_error_count));
2765 if (es->s_first_error_time) {
ae0f78de 2766 printk(KERN_NOTICE "EXT4-fs (%s): initial error at time %u: %.*s:%d",
66e61a9e
TT		 2767 sb->s_id, le32_to_cpu(es->s_first_error_time),
2768 (int) sizeof(es->s_first_error_func),
2769 es->s_first_error_func,
2770 le32_to_cpu(es->s_first_error_line));
2771 if (es->s_first_error_ino)
651e1c3b 2772 printk(KERN_CONT ": inode %u",
66e61a9e
TT		 2773 le32_to_cpu(es->s_first_error_ino));
2774 if (es->s_first_error_block)
651e1c3b 2775 printk(KERN_CONT ": block %llu", (unsigned long long)
66e61a9e 2776 le64_to_cpu(es->s_first_error_block));
651e1c3b 2777 printk(KERN_CONT "\n");
66e61a9e
TT		 2778 }
2779 if (es->s_last_error_time) {
ae0f78de 2780 printk(KERN_NOTICE "EXT4-fs (%s): last error at time %u: %.*s:%d",
66e61a9e
TT		 2781 sb->s_id, le32_to_cpu(es->s_last_error_time),
2782 (int) sizeof(es->s_last_error_func),
2783 es->s_last_error_func,
2784 le32_to_cpu(es->s_last_error_line));
2785 if (es->s_last_error_ino)
651e1c3b 2786 printk(KERN_CONT ": inode %u",
66e61a9e
TT		 2787 le32_to_cpu(es->s_last_error_ino));
2788 if (es->s_last_error_block)
651e1c3b 2789 printk(KERN_CONT ": block %llu", (unsigned long long)
66e61a9e 2790 le64_to_cpu(es->s_last_error_block));
651e1c3b 2791 printk(KERN_CONT "\n");
66e61a9e
TT		 2792 }
2793 mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ); /* Once a day */
2794}
2795
bfff6873
LC		 2796/* Find next suitable group and run ext4_init_inode_table */
2797static int ext4_run_li_request(struct ext4_li_request *elr)
2798{
2799 struct ext4_group_desc *gdp = NULL;
2800 ext4_group_t group, ngroups;
2801 struct super_block *sb;
2802 unsigned long timeout = 0;
2803 int ret = 0;
2804
2805 sb = elr->lr_super;
2806 ngroups = EXT4_SB(sb)->s_groups_count;
2807
2808 for (group = elr->lr_next_group; group < ngroups; group++) {
2809 gdp = ext4_get_group_desc(sb, group, NULL);
2810 if (!gdp) {
2811 ret = 1;
2812 break;
2813 }
2814
2815 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2816 break;
2817 }
2818
7f511862 2819 if (group >= ngroups)
bfff6873
LC		 2820 ret = 1;
2821
2822 if (!ret) {
2823 timeout = jiffies;
2824 ret = ext4_init_inode_table(sb, group,
2825 elr->lr_timeout ? 0 : 1);
2826 if (elr->lr_timeout == 0) {
51ce6511
LC		 2827 timeout = (jiffies - timeout) *
2828 elr->lr_sbi->s_li_wait_mult;
bfff6873
LC		 2829 elr->lr_timeout = timeout;
2830 }
2831 elr->lr_next_sched = jiffies + elr->lr_timeout;
2832 elr->lr_next_group = group + 1;
2833 }
bfff6873
LC		 2834 return ret;
2835}
2836
2837/*
2838 * Remove lr_request from the list_request and free the
4ed5c033 2839 * request structure. Should be called with li_list_mtx held
bfff6873
LC		 2840 */
2841static void ext4_remove_li_request(struct ext4_li_request *elr)
2842{
2843 struct ext4_sb_info *sbi;
2844
2845 if (!elr)
2846 return;
2847
2848 sbi = elr->lr_sbi;
2849
2850 list_del(&elr->lr_request);
2851 sbi->s_li_request = NULL;
2852 kfree(elr);
2853}
2854
2855static void ext4_unregister_li_request(struct super_block *sb)
2856{
1bb933fb
LC		 2857 mutex_lock(&ext4_li_mtx);
2858 if (!ext4_li_info) {
2859 mutex_unlock(&ext4_li_mtx);
bfff6873 2860 return;
1bb933fb 2861 }
bfff6873
LC		 2862
2863 mutex_lock(&ext4_li_info->li_list_mtx);
1bb933fb 2864 ext4_remove_li_request(EXT4_SB(sb)->s_li_request);
bfff6873 2865 mutex_unlock(&ext4_li_info->li_list_mtx);
1bb933fb 2866 mutex_unlock(&ext4_li_mtx);
bfff6873
LC		 2867}
2868
8f1f7453
ES		 2869static struct task_struct *ext4_lazyinit_task;
2870
bfff6873
LC		 2871/*
2872 * This is the function where ext4lazyinit thread lives. It walks
2873 * through the request list searching for next scheduled filesystem.
2874 * When such a fs is found, run the lazy initialization request
2875 * (ext4_rn_li_request) and keep track of the time spend in this
2876 * function. Based on that time we compute next schedule time of
2877 * the request. When walking through the list is complete, compute
2878 * next waking time and put itself into sleep.
2879 */
2880static int ext4_lazyinit_thread(void *arg)
2881{
2882 struct ext4_lazy_init *eli = (struct ext4_lazy_init *)arg;
2883 struct list_head *pos, *n;
2884 struct ext4_li_request *elr;
4ed5c033 2885 unsigned long next_wakeup, cur;
bfff6873
LC		 2886
2887 BUG_ON(NULL == eli);
2888
bfff6873
LC		 2889cont_thread:
2890 while (true) {
2891 next_wakeup = MAX_JIFFY_OFFSET;
2892
2893 mutex_lock(&eli->li_list_mtx);
2894 if (list_empty(&eli->li_request_list)) {
2895 mutex_unlock(&eli->li_list_mtx);
2896 goto exit_thread;
2897 }
bfff6873 2898 list_for_each_safe(pos, n, &eli->li_request_list) {
e22834f0
DM		 2899 int err = 0;
2900 int progress = 0;
bfff6873
LC		 2901 elr = list_entry(pos, struct ext4_li_request,
2902 lr_request);
2903
e22834f0
DM		 2904 if (time_before(jiffies, elr->lr_next_sched)) {
2905 if (time_before(elr->lr_next_sched, next_wakeup))
2906 next_wakeup = elr->lr_next_sched;
2907 continue;
2908 }
2909 if (down_read_trylock(&elr->lr_super->s_umount)) {
2910 if (sb_start_write_trylock(elr->lr_super)) {
2911 progress = 1;
2912 /*
2913 * We hold sb->s_umount, sb can not
2914 * be removed from the list, it is
2915 * now safe to drop li_list_mtx
2916 */
2917 mutex_unlock(&eli->li_list_mtx);
2918 err = ext4_run_li_request(elr);
2919 sb_end_write(elr->lr_super);
2920 mutex_lock(&eli->li_list_mtx);
2921 n = pos->next;
b2c78cd0 2922 }
e22834f0
DM		 2923 up_read((&elr->lr_super->s_umount));
2924 }
2925 /* error, remove the lazy_init job */
2926 if (err) {
2927 ext4_remove_li_request(elr);
2928 continue;
2929 }
2930 if (!progress) {
2931 elr->lr_next_sched = jiffies +
2932 (prandom_u32()
2933 % (EXT4_DEF_LI_MAX_START_DELAY * HZ));
bfff6873 2934 }
bfff6873
LC		 2935 if (time_before(elr->lr_next_sched, next_wakeup))
2936 next_wakeup = elr->lr_next_sched;
2937 }
2938 mutex_unlock(&eli->li_list_mtx);
2939
a0acae0e 2940 try_to_freeze();
bfff6873 2941
4ed5c033
LC		 2942 cur = jiffies;
2943 if ((time_after_eq(cur, next_wakeup)) ||
f4245bd4 2944 (MAX_JIFFY_OFFSET == next_wakeup)) {
bfff6873
LC		 2945 cond_resched();
2946 continue;
2947 }
2948
4ed5c033
LC		 2949 schedule_timeout_interruptible(next_wakeup - cur);
2950
8f1f7453
ES		 2951 if (kthread_should_stop()) {
2952 ext4_clear_request_list();
2953 goto exit_thread;
2954 }
bfff6873
LC		 2955 }
2956
2957exit_thread:
2958 /*
2959 * It looks like the request list is empty, but we need
2960 * to check it under the li_list_mtx lock, to prevent any
2961 * additions into it, and of course we should lock ext4_li_mtx
2962 * to atomically free the list and ext4_li_info, because at
2963 * this point another ext4 filesystem could be registering
2964 * new one.
2965 */
2966 mutex_lock(&ext4_li_mtx);
2967 mutex_lock(&eli->li_list_mtx);
2968 if (!list_empty(&eli->li_request_list)) {
2969 mutex_unlock(&eli->li_list_mtx);
2970 mutex_unlock(&ext4_li_mtx);
2971 goto cont_thread;
2972 }
2973 mutex_unlock(&eli->li_list_mtx);
bfff6873
LC		 2974 kfree(ext4_li_info);
2975 ext4_li_info = NULL;
2976 mutex_unlock(&ext4_li_mtx);
2977
2978 return 0;
2979}
2980
2981static void ext4_clear_request_list(void)
2982{
2983 struct list_head *pos, *n;
2984 struct ext4_li_request *elr;
2985
2986 mutex_lock(&ext4_li_info->li_list_mtx);
bfff6873
LC		 2987 list_for_each_safe(pos, n, &ext4_li_info->li_request_list) {
2988 elr = list_entry(pos, struct ext4_li_request,
2989 lr_request);
2990 ext4_remove_li_request(elr);
2991 }
2992 mutex_unlock(&ext4_li_info->li_list_mtx);
2993}
2994
2995static int ext4_run_lazyinit_thread(void)
2996{
8f1f7453
ES		 2997 ext4_lazyinit_task = kthread_run(ext4_lazyinit_thread,
2998 ext4_li_info, "ext4lazyinit");
2999 if (IS_ERR(ext4_lazyinit_task)) {
3000 int err = PTR_ERR(ext4_lazyinit_task);
bfff6873 3001 ext4_clear_request_list();
bfff6873
LC		 3002 kfree(ext4_li_info);
3003 ext4_li_info = NULL;
92b97816 3004 printk(KERN_CRIT "EXT4-fs: error %d creating inode table "
bfff6873
LC		 3005 "initialization thread\n",
3006 err);
3007 return err;
3008 }
3009 ext4_li_info->li_state |= EXT4_LAZYINIT_RUNNING;
bfff6873
LC		 3010 return 0;
3011}
3012
3013/*
3014 * Check whether it make sense to run itable init. thread or not.
3015 * If there is at least one uninitialized inode table, return
3016 * corresponding group number, else the loop goes through all
3017 * groups and return total number of groups.
3018 */
3019static ext4_group_t ext4_has_uninit_itable(struct super_block *sb)
3020{
3021 ext4_group_t group, ngroups = EXT4_SB(sb)->s_groups_count;
3022 struct ext4_group_desc *gdp = NULL;
3023
3024 for (group = 0; group < ngroups; group++) {
3025 gdp = ext4_get_group_desc(sb, group, NULL);
3026 if (!gdp)
3027 continue;
3028
3029 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
3030 break;
3031 }
3032
3033 return group;
3034}
3035
3036static int ext4_li_info_new(void)
3037{
3038 struct ext4_lazy_init *eli = NULL;
3039
3040 eli = kzalloc(sizeof(*eli), GFP_KERNEL);
3041 if (!eli)
3042 return -ENOMEM;
3043
bfff6873
LC		 3044 INIT_LIST_HEAD(&eli->li_request_list);
3045 mutex_init(&eli->li_list_mtx);
3046
bfff6873
LC		 3047 eli->li_state |= EXT4_LAZYINIT_QUIT;
3048
3049 ext4_li_info = eli;
3050
3051 return 0;
3052}
3053
3054static struct ext4_li_request *ext4_li_request_new(struct super_block *sb,
3055 ext4_group_t start)
3056{
3057 struct ext4_sb_info *sbi = EXT4_SB(sb);
3058 struct ext4_li_request *elr;
bfff6873
LC		 3059
3060 elr = kzalloc(sizeof(*elr), GFP_KERNEL);
3061 if (!elr)
3062 return NULL;
3063
3064 elr->lr_super = sb;
3065 elr->lr_sbi = sbi;
3066 elr->lr_next_group = start;
3067
3068 /*
3069 * Randomize first schedule time of the request to
3070 * spread the inode table initialization requests
3071 * better.
3072 */
dd1f723b
TT		 3073 elr->lr_next_sched = jiffies + (prandom_u32() %
3074 (EXT4_DEF_LI_MAX_START_DELAY * HZ));
bfff6873
LC		 3075 return elr;
3076}
3077
7f511862
TT		 3078int ext4_register_li_request(struct super_block *sb,
3079 ext4_group_t first_not_zeroed)
bfff6873
LC		 3080{
3081 struct ext4_sb_info *sbi = EXT4_SB(sb);
7f511862 3082 struct ext4_li_request *elr = NULL;
bfff6873 3083 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
6c5a6cb9 3084 int ret = 0;
bfff6873 3085
7f511862 3086 mutex_lock(&ext4_li_mtx);
51ce6511
LC		 3087 if (sbi->s_li_request != NULL) {
3088 /*
3089 * Reset timeout so it can be computed again, because
3090 * s_li_wait_mult might have changed.
3091 */
3092 sbi->s_li_request->lr_timeout = 0;
7f511862 3093 goto out;
51ce6511 3094 }
bfff6873
LC		 3095
3096 if (first_not_zeroed == ngroups ||
3097 (sb->s_flags & MS_RDONLY) ||
55ff3840 3098 !test_opt(sb, INIT_INODE_TABLE))
7f511862 3099 goto out;
bfff6873
LC		 3100
3101 elr = ext4_li_request_new(sb, first_not_zeroed);
7f511862
TT		 3102 if (!elr) {
3103 ret = -ENOMEM;
3104 goto out;
3105 }
bfff6873
LC		 3106
3107 if (NULL == ext4_li_info) {
3108 ret = ext4_li_info_new();
3109 if (ret)
3110 goto out;
3111 }
3112
3113 mutex_lock(&ext4_li_info->li_list_mtx);
3114 list_add(&elr->lr_request, &ext4_li_info->li_request_list);
3115 mutex_unlock(&ext4_li_info->li_list_mtx);
3116
3117 sbi->s_li_request = elr;
46e4690b
TM		 3118 /*
3119 * set elr to NULL here since it has been inserted to
3120 * the request_list and the removal and free of it is
3121 * handled by ext4_clear_request_list from now on.
3122 */
3123 elr = NULL;
bfff6873
LC		 3124
3125 if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) {
3126 ret = ext4_run_lazyinit_thread();
3127 if (ret)
3128 goto out;
3129 }
bfff6873 3130out:
beed5ecb
NK		 3131 mutex_unlock(&ext4_li_mtx);
3132 if (ret)
bfff6873 3133 kfree(elr);
bfff6873
LC		 3134 return ret;
3135}
3136
3137/*
3138 * We do not need to lock anything since this is called on
3139 * module unload.
3140 */
3141static void ext4_destroy_lazyinit_thread(void)
3142{
3143 /*
3144 * If thread exited earlier
3145 * there's nothing to be done.
3146 */
8f1f7453 3147 if (!ext4_li_info || !ext4_lazyinit_task)
bfff6873
LC		 3148 return;
3149
8f1f7453 3150 kthread_stop(ext4_lazyinit_task);
bfff6873
LC		 3151}
3152
25ed6e8a
DW		 3153static int set_journal_csum_feature_set(struct super_block *sb)
3154{
3155 int ret = 1;
3156 int compat, incompat;
3157 struct ext4_sb_info *sbi = EXT4_SB(sb);
3158
9aa5d32b 3159 if (ext4_has_metadata_csum(sb)) {
db9ee220 3160 /* journal checksum v3 */
25ed6e8a 3161 compat = 0;
db9ee220 3162 incompat = JBD2_FEATURE_INCOMPAT_CSUM_V3;
25ed6e8a
DW		 3163 } else {
3164 /* journal checksum v1 */
3165 compat = JBD2_FEATURE_COMPAT_CHECKSUM;
3166 incompat = 0;
3167 }
3168
feb8c6d3
DW		 3169 jbd2_journal_clear_features(sbi->s_journal,
3170 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
3171 JBD2_FEATURE_INCOMPAT_CSUM_V3 |
3172 JBD2_FEATURE_INCOMPAT_CSUM_V2);
25ed6e8a
DW		 3173 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
3174 ret = jbd2_journal_set_features(sbi->s_journal,
3175 compat, 0,
3176 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT |
3177 incompat);
3178 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
3179 ret = jbd2_journal_set_features(sbi->s_journal,
3180 compat, 0,
3181 incompat);
3182 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
3183 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
3184 } else {
feb8c6d3
DW		 3185 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
3186 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
25ed6e8a
DW		 3187 }
3188
3189 return ret;
3190}
3191
952fc18e
TT		 3192/*
3193 * Note: calculating the overhead so we can be compatible with
3194 * historical BSD practice is quite difficult in the face of
3195 * clusters/bigalloc. This is because multiple metadata blocks from
3196 * different block group can end up in the same allocation cluster.
3197 * Calculating the exact overhead in the face of clustered allocation
3198 * requires either O(all block bitmaps) in memory or O(number of block
3199 * groups**2) in time. We will still calculate the superblock for
3200 * older file systems --- and if we come across with a bigalloc file
3201 * system with zero in s_overhead_clusters the estimate will be close to
3202 * correct especially for very large cluster sizes --- but for newer
3203 * file systems, it's better to calculate this figure once at mkfs
3204 * time, and store it in the superblock. If the superblock value is
3205 * present (even for non-bigalloc file systems), we will use it.
3206 */
3207static int count_overhead(struct super_block *sb, ext4_group_t grp,
3208 char *buf)
3209{
3210 struct ext4_sb_info *sbi = EXT4_SB(sb);
3211 struct ext4_group_desc *gdp;
3212 ext4_fsblk_t first_block, last_block, b;
3213 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3214 int s, j, count = 0;
3215
e2b911c5 3216 if (!ext4_has_feature_bigalloc(sb))
0548bbb8
TT		 3217 return (ext4_bg_has_super(sb, grp) + ext4_bg_num_gdb(sb, grp) +
3218 sbi->s_itb_per_group + 2);
3219
952fc18e
TT		 3220 first_block = le32_to_cpu(sbi->s_es->s_first_data_block) +
3221 (grp * EXT4_BLOCKS_PER_GROUP(sb));
3222 last_block = first_block + EXT4_BLOCKS_PER_GROUP(sb) - 1;
3223 for (i = 0; i < ngroups; i++) {
3224 gdp = ext4_get_group_desc(sb, i, NULL);
3225 b = ext4_block_bitmap(sb, gdp);
3226 if (b >= first_block && b <= last_block) {
3227 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3228 count++;
3229 }
3230 b = ext4_inode_bitmap(sb, gdp);
3231 if (b >= first_block && b <= last_block) {
3232 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3233 count++;
3234 }
3235 b = ext4_inode_table(sb, gdp);
3236 if (b >= first_block && b + sbi->s_itb_per_group <= last_block)
3237 for (j = 0; j < sbi->s_itb_per_group; j++, b++) {
3238 int c = EXT4_B2C(sbi, b - first_block);
3239 ext4_set_bit(c, buf);
3240 count++;
3241 }
3242 if (i != grp)
3243 continue;
3244 s = 0;
3245 if (ext4_bg_has_super(sb, grp)) {
3246 ext4_set_bit(s++, buf);
3247 count++;
3248 }
c48ae41b
TT		 3249 j = ext4_bg_num_gdb(sb, grp);
3250 if (s + j > EXT4_BLOCKS_PER_GROUP(sb)) {
3251 ext4_error(sb, "Invalid number of block group "
3252 "descriptor blocks: %d", j);
3253 j = EXT4_BLOCKS_PER_GROUP(sb) - s;
952fc18e 3254 }
c48ae41b
TT		 3255 count += j;
3256 for (; j > 0; j--)
3257 ext4_set_bit(EXT4_B2C(sbi, s++), buf);
952fc18e
TT		 3258 }
3259 if (!count)
3260 return 0;
3261 return EXT4_CLUSTERS_PER_GROUP(sb) -
3262 ext4_count_free(buf, EXT4_CLUSTERS_PER_GROUP(sb) / 8);
3263}
3264
3265/*
3266 * Compute the overhead and stash it in sbi->s_overhead
3267 */
3268int ext4_calculate_overhead(struct super_block *sb)
3269{
3270 struct ext4_sb_info *sbi = EXT4_SB(sb);
3271 struct ext4_super_block *es = sbi->s_es;
3c816ded
EW		 3272 struct inode *j_inode;
3273 unsigned int j_blocks, j_inum = le32_to_cpu(es->s_journal_inum);
952fc18e
TT		 3274 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3275 ext4_fsblk_t overhead = 0;
4fdb5543 3276 char *buf = (char *) get_zeroed_page(GFP_NOFS);
952fc18e 3277
952fc18e
TT		 3278 if (!buf)
3279 return -ENOMEM;
3280
3281 /*
3282 * Compute the overhead (FS structures). This is constant
3283 * for a given filesystem unless the number of block groups
3284 * changes so we cache the previous value until it does.
3285 */
3286
3287 /*
3288 * All of the blocks before first_data_block are overhead
3289 */
3290 overhead = EXT4_B2C(sbi, le32_to_cpu(es->s_first_data_block));
3291
3292 /*
3293 * Add the overhead found in each block group
3294 */
3295 for (i = 0; i < ngroups; i++) {
3296 int blks;
3297
3298 blks = count_overhead(sb, i, buf);
3299 overhead += blks;
3300 if (blks)
3301 memset(buf, 0, PAGE_SIZE);
3302 cond_resched();
3303 }
3c816ded
EW		 3304
3305 /*
3306 * Add the internal journal blocks whether the journal has been
3307 * loaded or not
3308 */
b003b524 3309 if (sbi->s_journal && !sbi->journal_bdev)
810da240 3310 overhead += EXT4_NUM_B2C(sbi, sbi->s_journal->j_maxlen);
3c816ded
EW		 3311 else if (ext4_has_feature_journal(sb) && !sbi->s_journal) {
3312 j_inode = ext4_get_journal_inode(sb, j_inum);
3313 if (j_inode) {
3314 j_blocks = j_inode->i_size >> sb->s_blocksize_bits;
3315 overhead += EXT4_NUM_B2C(sbi, j_blocks);
3316 iput(j_inode);
3317 } else {
3318 ext4_msg(sb, KERN_ERR, "can't get journal size");
3319 }
3320 }
952fc18e
TT		 3321 sbi->s_overhead = overhead;
3322 smp_wmb();
3323 free_page((unsigned long) buf);
3324 return 0;
3325}
3326
b5799018 3327static void ext4_set_resv_clusters(struct super_block *sb)
27dd4385
LC		 3328{
3329 ext4_fsblk_t resv_clusters;
b5799018 3330 struct ext4_sb_info *sbi = EXT4_SB(sb);
27dd4385 3331
30fac0f7
JK		 3332 /*
3333 * There's no need to reserve anything when we aren't using extents.
3334 * The space estimates are exact, there are no unwritten extents,
3335 * hole punching doesn't need new metadata... This is needed especially
3336 * to keep ext2/3 backward compatibility.
3337 */
e2b911c5 3338 if (!ext4_has_feature_extents(sb))
b5799018 3339 return;
27dd4385
LC		 3340 /*
3341 * By default we reserve 2% or 4096 clusters, whichever is smaller.
3342 * This should cover the situations where we can not afford to run
3343 * out of space like for example punch hole, or converting
556615dc 3344 * unwritten extents in delalloc path. In most cases such
27dd4385
LC		 3345 * allocation would require 1, or 2 blocks, higher numbers are
3346 * very rare.
3347 */
b5799018
TT		 3348 resv_clusters = (ext4_blocks_count(sbi->s_es) >>
3349 sbi->s_cluster_bits);
27dd4385
LC		 3350
3351 do_div(resv_clusters, 50);
3352 resv_clusters = min_t(ext4_fsblk_t, resv_clusters, 4096);
3353
b5799018 3354 atomic64_set(&sbi->s_resv_clusters, resv_clusters);
27dd4385
LC		 3355}
3356
2b2d6d01 3357static int ext4_fill_super(struct super_block *sb, void *data, int silent)
ac27a0ec 3358{
d4c402d9 3359 char *orig_data = kstrdup(data, GFP_KERNEL);
2b2d6d01 3360 struct buffer_head *bh;
617ba13b 3361 struct ext4_super_block *es = NULL;
5aee0f8a 3362 struct ext4_sb_info *sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
617ba13b
MC		 3363 ext4_fsblk_t block;
3364 ext4_fsblk_t sb_block = get_sb_block(&data);
70bbb3e0 3365 ext4_fsblk_t logical_sb_block;
ac27a0ec 3366 unsigned long offset = 0;
ac27a0ec
DK		 3367 unsigned long journal_devnum = 0;
3368 unsigned long def_mount_opts;
3369 struct inode *root;
0390131b 3370 const char *descr;
dcc7dae3 3371 int ret = -ENOMEM;
281b5995 3372 int blocksize, clustersize;
4ec11028
TT		 3373 unsigned int db_count;
3374 unsigned int i;
281b5995 3375 int needs_recovery, has_huge_files, has_bigalloc;
bd81d8ee 3376 __u64 blocks_count;
07aa2ea1 3377 int err = 0;
b3881f74 3378 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
bfff6873 3379 ext4_group_t first_not_zeroed;
ac27a0ec 3380
5aee0f8a
TT		 3381 if ((data && !orig_data) || !sbi)
3382 goto out_free_base;
705895b6
PE		 3383
3384 sbi->s_blockgroup_lock =
3385 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
5aee0f8a
TT		 3386 if (!sbi->s_blockgroup_lock)
3387 goto out_free_base;
3388
ac27a0ec 3389 sb->s_fs_info = sbi;
2c0544b2 3390 sbi->s_sb = sb;
240799cd 3391 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
d9c9bef1 3392 sbi->s_sb_block = sb_block;
f613dfcb
TT		 3393 if (sb->s_bdev->bd_part)
3394 sbi->s_sectors_written_start =
3395 part_stat_read(sb->s_bdev->bd_part, sectors[1]);
ac27a0ec 3396
9f6200bb 3397 /* Cleanup superblock name */
ec3904dc 3398 strreplace(sb->s_id, '/', '!');
9f6200bb 3399
07aa2ea1 3400 /* -EINVAL is default */
dcc7dae3 3401 ret = -EINVAL;
617ba13b 3402 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
ac27a0ec 3403 if (!blocksize) {
b31e1552 3404 ext4_msg(sb, KERN_ERR, "unable to set blocksize");
ac27a0ec
DK		 3405 goto out_fail;
3406 }
3407
3408 /*
617ba13b 3409 * The ext4 superblock will not be buffer aligned for other than 1kB
ac27a0ec
DK		 3410 * block sizes. We need to calculate the offset from buffer start.
3411 */
617ba13b 3412 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
70bbb3e0
AM		 3413 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3414 offset = do_div(logical_sb_block, blocksize);
ac27a0ec 3415 } else {
70bbb3e0 3416 logical_sb_block = sb_block;
ac27a0ec
DK		 3417 }
3418
a8ac900b 3419 if (!(bh = sb_bread_unmovable(sb, logical_sb_block))) {
b31e1552 3420 ext4_msg(sb, KERN_ERR, "unable to read superblock");
ac27a0ec
DK		 3421 goto out_fail;
3422 }
3423 /*
3424 * Note: s_es must be initialized as soon as possible because
617ba13b 3425 * some ext4 macro-instructions depend on its value
ac27a0ec 3426 */
2716b802 3427 es = (struct ext4_super_block *) (bh->b_data + offset);
ac27a0ec
DK		 3428 sbi->s_es = es;
3429 sb->s_magic = le16_to_cpu(es->s_magic);
617ba13b
MC		 3430 if (sb->s_magic != EXT4_SUPER_MAGIC)
3431 goto cantfind_ext4;
afc32f7e 3432 sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
ac27a0ec 3433
feb0ab32 3434 /* Warn if metadata_csum and gdt_csum are both set. */
e2b911c5
DW		 3435 if (ext4_has_feature_metadata_csum(sb) &&
3436 ext4_has_feature_gdt_csum(sb))
363307e6 3437 ext4_warning(sb, "metadata_csum and uninit_bg are "
feb0ab32
DW		 3438 "redundant flags; please run fsck.");
3439
d25425f8
DW		 3440 /* Check for a known checksum algorithm */
3441 if (!ext4_verify_csum_type(sb, es)) {
3442 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3443 "unknown checksum algorithm.");
3444 silent = 1;
3445 goto cantfind_ext4;
3446 }
3447
0441984a 3448 /* Load the checksum driver */
e2b911c5 3449 if (ext4_has_feature_metadata_csum(sb)) {
0441984a
DW		 3450 sbi->s_chksum_driver = crypto_alloc_shash("crc32c", 0, 0);
3451 if (IS_ERR(sbi->s_chksum_driver)) {
3452 ext4_msg(sb, KERN_ERR, "Cannot load crc32c driver.");
3453 ret = PTR_ERR(sbi->s_chksum_driver);
3454 sbi->s_chksum_driver = NULL;
3455 goto failed_mount;
3456 }
3457 }
3458
a9c47317
DW		 3459 /* Check superblock checksum */
3460 if (!ext4_superblock_csum_verify(sb, es)) {
3461 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3462 "invalid superblock checksum. Run e2fsck?");
3463 silent = 1;
6a797d27 3464 ret = -EFSBADCRC;
a9c47317
DW		 3465 goto cantfind_ext4;
3466 }
3467
3468 /* Precompute checksum seed for all metadata */
e2b911c5 3469 if (ext4_has_feature_csum_seed(sb))
8c81bd8f
DW		 3470 sbi->s_csum_seed = le32_to_cpu(es->s_checksum_seed);
3471 else if (ext4_has_metadata_csum(sb))
a9c47317
DW		 3472 sbi->s_csum_seed = ext4_chksum(sbi, ~0, es->s_uuid,
3473 sizeof(es->s_uuid));
3474
ac27a0ec
DK		 3475 /* Set defaults before we parse the mount options */
3476 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
fd8c37ec 3477 set_opt(sb, INIT_INODE_TABLE);
617ba13b 3478 if (def_mount_opts & EXT4_DEFM_DEBUG)
fd8c37ec 3479 set_opt(sb, DEBUG);
87f26807 3480 if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
fd8c37ec 3481 set_opt(sb, GRPID);
617ba13b 3482 if (def_mount_opts & EXT4_DEFM_UID16)
fd8c37ec 3483 set_opt(sb, NO_UID32);
ea663336 3484 /* xattr user namespace & acls are now defaulted on */
ea663336 3485 set_opt(sb, XATTR_USER);
03010a33 3486#ifdef CONFIG_EXT4_FS_POSIX_ACL
ea663336 3487 set_opt(sb, POSIX_ACL);
2e7842b8 3488#endif
98c1a759
DW		 3489 /* don't forget to enable journal_csum when metadata_csum is enabled. */
3490 if (ext4_has_metadata_csum(sb))
3491 set_opt(sb, JOURNAL_CHECKSUM);
3492
617ba13b 3493 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
fd8c37ec 3494 set_opt(sb, JOURNAL_DATA);
617ba13b 3495 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
fd8c37ec 3496 set_opt(sb, ORDERED_DATA);
617ba13b 3497 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
fd8c37ec 3498 set_opt(sb, WRITEBACK_DATA);
617ba13b
MC		 3499
3500 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
fd8c37ec 3501 set_opt(sb, ERRORS_PANIC);
bb4f397a 3502 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
fd8c37ec 3503 set_opt(sb, ERRORS_CONT);
bb4f397a 3504 else
fd8c37ec 3505 set_opt(sb, ERRORS_RO);
45f1a9c3
DW		 3506 /* block_validity enabled by default; disable with noblock_validity */
3507 set_opt(sb, BLOCK_VALIDITY);
8b67f04a 3508 if (def_mount_opts & EXT4_DEFM_DISCARD)
fd8c37ec 3509 set_opt(sb, DISCARD);
ac27a0ec 3510
08cefc7a
EB		 3511 sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));
3512 sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid));
30773840
TT		 3513 sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
3514 sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
3515 sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
ac27a0ec 3516
8b67f04a 3517 if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0)
fd8c37ec 3518 set_opt(sb, BARRIER);
ac27a0ec 3519
dd919b98
AK		 3520 /*
3521 * enable delayed allocation by default
3522 * Use -o nodelalloc to turn it off
3523 */
bc0b75f7 3524 if (!IS_EXT3_SB(sb) && !IS_EXT2_SB(sb) &&
8b67f04a 3525 ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0))
fd8c37ec 3526 set_opt(sb, DELALLOC);
dd919b98 3527
51ce6511
LC		 3528 /*
3529 * set default s_li_wait_mult for lazyinit, for the case there is
3530 * no mount option specified.
3531 */
3532 sbi->s_li_wait_mult = EXT4_DEF_LI_WAIT_MULT;
3533
5aee0f8a
TT		 3534 if (sbi->s_es->s_mount_opts[0]) {
3535 char *s_mount_opts = kstrndup(sbi->s_es->s_mount_opts,
3536 sizeof(sbi->s_es->s_mount_opts),
3537 GFP_KERNEL);
3538 if (!s_mount_opts)
3539 goto failed_mount;
3540 if (!parse_options(s_mount_opts, sb, &journal_devnum,
3541 &journal_ioprio, 0)) {
3542 ext4_msg(sb, KERN_WARNING,
3543 "failed to parse options in superblock: %s",
3544 s_mount_opts);
3545 }
3546 kfree(s_mount_opts);
8b67f04a 3547 }
5a916be1 3548 sbi->s_def_mount_opt = sbi->s_mount_opt;
b3881f74 3549 if (!parse_options((char *) data, sb, &journal_devnum,
661aa520 3550 &journal_ioprio, 0))
ac27a0ec
DK		 3551 goto failed_mount;
3552
56889787
TT		 3553 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
3554 printk_once(KERN_WARNING "EXT4-fs: Warning: mounting "
3555 "with data=journal disables delayed "
3556 "allocation and O_DIRECT support!\n");
3557 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
3558 ext4_msg(sb, KERN_ERR, "can't mount with "
3559 "both data=journal and delalloc");
3560 goto failed_mount;
3561 }
3562 if (test_opt(sb, DIOREAD_NOLOCK)) {
3563 ext4_msg(sb, KERN_ERR, "can't mount with "
6ae6514b 3564 "both data=journal and dioread_nolock");
56889787
TT		 3565 goto failed_mount;
3566 }
923ae0ff
RZ		 3567 if (test_opt(sb, DAX)) {
3568 ext4_msg(sb, KERN_ERR, "can't mount with "
3569 "both data=journal and dax");
3570 goto failed_mount;
3571 }
73b92a2a
SK		 3572 if (ext4_has_feature_encrypt(sb)) {
3573 ext4_msg(sb, KERN_WARNING,
3574 "encrypted files will use data=ordered "
3575 "instead of data journaling mode");
3576 }
56889787
TT		 3577 if (test_opt(sb, DELALLOC))
3578 clear_opt(sb, DELALLOC);
001e4a87
TH		 3579 } else {
3580 sb->s_iflags |= SB_I_CGROUPWB;
56889787
TT		 3581 }
3582
ac27a0ec 3583 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
482a7425 3584 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec 3585
617ba13b 3586 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
e2b911c5
DW		 3587 (ext4_has_compat_features(sb) ||
3588 ext4_has_ro_compat_features(sb) ||
3589 ext4_has_incompat_features(sb)))
b31e1552
ES		 3590 ext4_msg(sb, KERN_WARNING,
3591 "feature flags set on rev 0 fs, "
3592 "running e2fsck is recommended");
469108ff 3593
ed3654eb
TT		 3594 if (es->s_creator_os == cpu_to_le32(EXT4_OS_HURD)) {
3595 set_opt2(sb, HURD_COMPAT);
e2b911c5 3596 if (ext4_has_feature_64bit(sb)) {
ed3654eb
TT		 3597 ext4_msg(sb, KERN_ERR,
3598 "The Hurd can't support 64-bit file systems");
3599 goto failed_mount;
3600 }
3601 }
3602
2035e776
TT		 3603 if (IS_EXT2_SB(sb)) {
3604 if (ext2_feature_set_ok(sb))
3605 ext4_msg(sb, KERN_INFO, "mounting ext2 file system "
3606 "using the ext4 subsystem");
3607 else {
3608 ext4_msg(sb, KERN_ERR, "couldn't mount as ext2 due "
3609 "to feature incompatibilities");
3610 goto failed_mount;
3611 }
3612 }
3613
3614 if (IS_EXT3_SB(sb)) {
3615 if (ext3_feature_set_ok(sb))
3616 ext4_msg(sb, KERN_INFO, "mounting ext3 file system "
3617 "using the ext4 subsystem");
3618 else {
3619 ext4_msg(sb, KERN_ERR, "couldn't mount as ext3 due "
3620 "to feature incompatibilities");
3621 goto failed_mount;
3622 }
3623 }
3624
ac27a0ec
DK		 3625 /*
3626 * Check feature flags regardless of the revision level, since we
3627 * previously didn't change the revision level when setting the flags,
3628 * so there is a chance incompat flags are set on a rev 0 filesystem.
3629 */
a13fb1a4 3630 if (!ext4_feature_set_ok(sb, (sb->s_flags & MS_RDONLY)))
ac27a0ec 3631 goto failed_mount;
a13fb1a4 3632
261cb20c 3633 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
617ba13b
MC		 3634 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
3635 blocksize > EXT4_MAX_BLOCK_SIZE) {
b31e1552 3636 ext4_msg(sb, KERN_ERR,
8cdf3372
TT		 3637 "Unsupported filesystem blocksize %d (%d log_block_size)",
3638 blocksize, le32_to_cpu(es->s_log_block_size));
3639 goto failed_mount;
3640 }
3641 if (le32_to_cpu(es->s_log_block_size) >
3642 (EXT4_MAX_BLOCK_LOG_SIZE - EXT4_MIN_BLOCK_LOG_SIZE)) {
3643 ext4_msg(sb, KERN_ERR,
3644 "Invalid log block size: %u",
3645 le32_to_cpu(es->s_log_block_size));
ac27a0ec
DK		 3646 goto failed_mount;
3647 }
3648
5b9554dc
TT		 3649 if (le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) > (blocksize / 4)) {
3650 ext4_msg(sb, KERN_ERR,
3651 "Number of reserved GDT blocks insanely large: %d",
3652 le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks));
3653 goto failed_mount;
3654 }
3655
923ae0ff 3656 if (sbi->s_mount_opt & EXT4_MOUNT_DAX) {
87eefeb4
TK		 3657 err = bdev_dax_supported(sb, blocksize);
3658 if (err)
923ae0ff 3659 goto failed_mount;
923ae0ff
RZ		 3660 }
3661
e2b911c5 3662 if (ext4_has_feature_encrypt(sb) && es->s_encryption_level) {
6ddb2447
TT		 3663 ext4_msg(sb, KERN_ERR, "Unsupported encryption level %d",
3664 es->s_encryption_level);
3665 goto failed_mount;
3666 }
3667
ac27a0ec 3668 if (sb->s_blocksize != blocksize) {
ce40733c
AK		 3669 /* Validate the filesystem blocksize */
3670 if (!sb_set_blocksize(sb, blocksize)) {
b31e1552 3671 ext4_msg(sb, KERN_ERR, "bad block size %d",
ce40733c 3672 blocksize);
ac27a0ec
DK		 3673 goto failed_mount;
3674 }
3675
2b2d6d01 3676 brelse(bh);
70bbb3e0
AM		 3677 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3678 offset = do_div(logical_sb_block, blocksize);
a8ac900b 3679 bh = sb_bread_unmovable(sb, logical_sb_block);
ac27a0ec 3680 if (!bh) {
b31e1552
ES		 3681 ext4_msg(sb, KERN_ERR,
3682 "Can't read superblock on 2nd try");
ac27a0ec
DK		 3683 goto failed_mount;
3684 }
2716b802 3685 es = (struct ext4_super_block *)(bh->b_data + offset);
ac27a0ec 3686 sbi->s_es = es;
617ba13b 3687 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
b31e1552
ES		 3688 ext4_msg(sb, KERN_ERR,
3689 "Magic mismatch, very weird!");
ac27a0ec
DK		 3690 goto failed_mount;
3691 }
3692 }
3693
e2b911c5 3694 has_huge_files = ext4_has_feature_huge_file(sb);
f287a1a5
TT		 3695 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
3696 has_huge_files);
3697 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
ac27a0ec 3698
617ba13b
MC		 3699 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
3700 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
3701 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
ac27a0ec
DK		 3702 } else {
3703 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
3704 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
617ba13b 3705 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
1330593e 3706 (!is_power_of_2(sbi->s_inode_size)) ||
ac27a0ec 3707 (sbi->s_inode_size > blocksize)) {
b31e1552
ES		 3708 ext4_msg(sb, KERN_ERR,
3709 "unsupported inode size: %d",
2b2d6d01 3710 sbi->s_inode_size);
ac27a0ec
DK		 3711 goto failed_mount;
3712 }
ef7f3835
KS		 3713 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
3714 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
ac27a0ec 3715 }
0b8e58a1 3716
0d1ee42f 3717 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
e2b911c5 3718 if (ext4_has_feature_64bit(sb)) {
8fadc143 3719 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
0d1ee42f 3720 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
d8ea6cf8 3721 !is_power_of_2(sbi->s_desc_size)) {
b31e1552
ES		 3722 ext4_msg(sb, KERN_ERR,
3723 "unsupported descriptor size %lu",
0d1ee42f
AR		 3724 sbi->s_desc_size);
3725 goto failed_mount;
3726 }
3727 } else
3728 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
0b8e58a1 3729
ac27a0ec 3730 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
ac27a0ec 3731 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
0b8e58a1 3732
617ba13b 3733 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
ac27a0ec 3734 if (sbi->s_inodes_per_block == 0)
617ba13b 3735 goto cantfind_ext4;
cd6bb35b
TT		 3736 if (sbi->s_inodes_per_group < sbi->s_inodes_per_block ||
3737 sbi->s_inodes_per_group > blocksize * 8) {
3738 ext4_msg(sb, KERN_ERR, "invalid inodes per group: %lu\n",
3739 sbi->s_blocks_per_group);
3740 goto failed_mount;
3741 }
ac27a0ec
DK		 3742 sbi->s_itb_per_group = sbi->s_inodes_per_group /
3743 sbi->s_inodes_per_block;
0d1ee42f 3744 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
ac27a0ec
DK		 3745 sbi->s_sbh = bh;
3746 sbi->s_mount_state = le16_to_cpu(es->s_state);
e57aa839
FW		 3747 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
3748 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
0b8e58a1 3749
2b2d6d01 3750 for (i = 0; i < 4; i++)
ac27a0ec
DK		 3751 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
3752 sbi->s_def_hash_version = es->s_def_hash_version;
e2b911c5 3753 if (ext4_has_feature_dir_index(sb)) {
23301410
TT		 3754 i = le32_to_cpu(es->s_flags);
3755 if (i & EXT2_FLAGS_UNSIGNED_HASH)
3756 sbi->s_hash_unsigned = 3;
3757 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
f99b2589 3758#ifdef __CHAR_UNSIGNED__
23301410
TT		 3759 if (!(sb->s_flags & MS_RDONLY))
3760 es->s_flags |=
3761 cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
3762 sbi->s_hash_unsigned = 3;
f99b2589 3763#else
23301410
TT		 3764 if (!(sb->s_flags & MS_RDONLY))
3765 es->s_flags |=
3766 cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
f99b2589 3767#endif
23301410 3768 }
f99b2589 3769 }
ac27a0ec 3770
281b5995
TT		 3771 /* Handle clustersize */
3772 clustersize = BLOCK_SIZE << le32_to_cpu(es->s_log_cluster_size);
e2b911c5 3773 has_bigalloc = ext4_has_feature_bigalloc(sb);
281b5995
TT		 3774 if (has_bigalloc) {
3775 if (clustersize < blocksize) {
3776 ext4_msg(sb, KERN_ERR,
3777 "cluster size (%d) smaller than "
3778 "block size (%d)", clustersize, blocksize);
3779 goto failed_mount;
3780 }
8cdf3372
TT		 3781 if (le32_to_cpu(es->s_log_cluster_size) >
3782 (EXT4_MAX_CLUSTER_LOG_SIZE - EXT4_MIN_BLOCK_LOG_SIZE)) {
3783 ext4_msg(sb, KERN_ERR,
3784 "Invalid log cluster size: %u",
3785 le32_to_cpu(es->s_log_cluster_size));
3786 goto failed_mount;
3787 }
281b5995
TT		 3788 sbi->s_cluster_bits = le32_to_cpu(es->s_log_cluster_size) -
3789 le32_to_cpu(es->s_log_block_size);
3790 sbi->s_clusters_per_group =
3791 le32_to_cpu(es->s_clusters_per_group);
3792 if (sbi->s_clusters_per_group > blocksize * 8) {
3793 ext4_msg(sb, KERN_ERR,
3794 "#clusters per group too big: %lu",
3795 sbi->s_clusters_per_group);
3796 goto failed_mount;
3797 }
3798 if (sbi->s_blocks_per_group !=
3799 (sbi->s_clusters_per_group * (clustersize / blocksize))) {
3800 ext4_msg(sb, KERN_ERR, "blocks per group (%lu) and "
3801 "clusters per group (%lu) inconsistent",
3802 sbi->s_blocks_per_group,
3803 sbi->s_clusters_per_group);
3804 goto failed_mount;
3805 }
3806 } else {
3807 if (clustersize != blocksize) {
3808 ext4_warning(sb, "fragment/cluster size (%d) != "
3809 "block size (%d)", clustersize,
3810 blocksize);
3811 clustersize = blocksize;
3812 }
3813 if (sbi->s_blocks_per_group > blocksize * 8) {
3814 ext4_msg(sb, KERN_ERR,
3815 "#blocks per group too big: %lu",
3816 sbi->s_blocks_per_group);
3817 goto failed_mount;
3818 }
3819 sbi->s_clusters_per_group = sbi->s_blocks_per_group;
3820 sbi->s_cluster_bits = 0;
ac27a0ec 3821 }
281b5995
TT		 3822 sbi->s_cluster_ratio = clustersize / blocksize;
3823
960fd856
TT		 3824 /* Do we have standard group size of clustersize * 8 blocks ? */
3825 if (sbi->s_blocks_per_group == clustersize << 3)
3826 set_opt2(sb, STD_GROUP_SIZE);
3827
bf43d84b
ES		 3828 /*
3829 * Test whether we have more sectors than will fit in sector_t,
3830 * and whether the max offset is addressable by the page cache.
3831 */
5a9ae68a 3832 err = generic_check_addressable(sb->s_blocksize_bits,
30ca22c7 3833 ext4_blocks_count(es));
5a9ae68a 3834 if (err) {
b31e1552 3835 ext4_msg(sb, KERN_ERR, "filesystem"
bf43d84b 3836 " too large to mount safely on this system");
ac27a0ec 3837 if (sizeof(sector_t) < 8)
90c699a9 3838 ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled");
ac27a0ec
DK		 3839 goto failed_mount;
3840 }
3841
617ba13b
MC		 3842 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
3843 goto cantfind_ext4;
e7c95593 3844
0f2ddca6
FTN		 3845 /* check blocks count against device size */
3846 blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
3847 if (blocks_count && ext4_blocks_count(es) > blocks_count) {
b31e1552
ES		 3848 ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
3849 "exceeds size of device (%llu blocks)",
0f2ddca6
FTN		 3850 ext4_blocks_count(es), blocks_count);
3851 goto failed_mount;
3852 }
3853
0b8e58a1
AD		 3854 /*
3855 * It makes no sense for the first data block to be beyond the end
3856 * of the filesystem.
3857 */
3858 if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
5635a62b 3859 ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
b31e1552
ES		 3860 "block %u is beyond end of filesystem (%llu)",
3861 le32_to_cpu(es->s_first_data_block),
3862 ext4_blocks_count(es));
e7c95593
ES		 3863 goto failed_mount;
3864 }
bd81d8ee
LV		 3865 blocks_count = (ext4_blocks_count(es) -
3866 le32_to_cpu(es->s_first_data_block) +
3867 EXT4_BLOCKS_PER_GROUP(sb) - 1);
3868 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
4ec11028 3869 if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
b31e1552 3870 ext4_msg(sb, KERN_WARNING, "groups count too large: %u "
4ec11028 3871 "(block count %llu, first data block %u, "
b31e1552 3872 "blocks per group %lu)", sbi->s_groups_count,
4ec11028
TT		 3873 ext4_blocks_count(es),
3874 le32_to_cpu(es->s_first_data_block),
3875 EXT4_BLOCKS_PER_GROUP(sb));
3876 goto failed_mount;
3877 }
bd81d8ee 3878 sbi->s_groups_count = blocks_count;
fb0a387d
ES		 3879 sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
3880 (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
617ba13b
MC		 3881 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
3882 EXT4_DESC_PER_BLOCK(sb);
3a4b77cd 3883 if (ext4_has_feature_meta_bg(sb)) {
2ba3e6e8 3884 if (le32_to_cpu(es->s_first_meta_bg) > db_count) {
3a4b77cd
EG		 3885 ext4_msg(sb, KERN_WARNING,
3886 "first meta block group too large: %u "
3887 "(group descriptor block count %u)",
3888 le32_to_cpu(es->s_first_meta_bg), db_count);
3889 goto failed_mount;
3890 }
3891 }
f18a5f21
TT		 3892 sbi->s_group_desc = ext4_kvmalloc(db_count *
3893 sizeof(struct buffer_head *),
3894 GFP_KERNEL);
ac27a0ec 3895 if (sbi->s_group_desc == NULL) {
b31e1552 3896 ext4_msg(sb, KERN_ERR, "not enough memory");
2cde417d 3897 ret = -ENOMEM;
ac27a0ec
DK		 3898 goto failed_mount;
3899 }
3900
705895b6 3901 bgl_lock_init(sbi->s_blockgroup_lock);
ac27a0ec
DK		 3902
3903 for (i = 0; i < db_count; i++) {
70bbb3e0 3904 block = descriptor_loc(sb, logical_sb_block, i);
a8ac900b 3905 sbi->s_group_desc[i] = sb_bread_unmovable(sb, block);
ac27a0ec 3906 if (!sbi->s_group_desc[i]) {
b31e1552
ES		 3907 ext4_msg(sb, KERN_ERR,
3908 "can't read group descriptor %d", i);
ac27a0ec
DK		 3909 db_count = i;
3910 goto failed_mount2;
3911 }
3912 }
829fa70d 3913 if (!ext4_check_descriptors(sb, logical_sb_block, &first_not_zeroed)) {
b31e1552 3914 ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
6a797d27 3915 ret = -EFSCORRUPTED;
f9ae9cf5 3916 goto failed_mount2;
ac27a0ec 3917 }
772cb7c8 3918
f9ae9cf5 3919 sbi->s_gdb_count = db_count;
ac27a0ec
DK		 3920 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
3921 spin_lock_init(&sbi->s_next_gen_lock);
3922
04ecddb7
JM		 3923 setup_timer(&sbi->s_err_report, print_daily_error_info,
3924 (unsigned long) sb);
04496411 3925
a75ae78f 3926 /* Register extent status tree shrinker */
eb68d0e2 3927 if (ext4_es_register_shrinker(sbi))
ce7e010a 3928 goto failed_mount3;
ce7e010a 3929
c9de560d 3930 sbi->s_stripe = ext4_get_stripe_size(sbi);
67a5da56 3931 sbi->s_extent_max_zeroout_kb = 32;
c9de560d 3932
f9ae9cf5
TT		 3933 /*
3934 * set up enough so that it can read an inode
3935 */
f6e63f90 3936 sb->s_op = &ext4_sops;
617ba13b
MC		 3937 sb->s_export_op = &ext4_export_ops;
3938 sb->s_xattr = ext4_xattr_handlers;
a7550b30 3939 sb->s_cop = &ext4_cryptops;
ac27a0ec 3940#ifdef CONFIG_QUOTA
617ba13b 3941 sb->dq_op = &ext4_quota_operations;
e2b911c5 3942 if (ext4_has_feature_quota(sb))
1fa5efe3 3943 sb->s_qcop = &dquot_quotactl_sysfile_ops;
262b4662
JK		 3944 else
3945 sb->s_qcop = &ext4_qctl_operations;
689c958c 3946 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP | QTYPE_MASK_PRJ;
ac27a0ec 3947#endif
f2fa2ffc
AK		 3948 memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
3949
ac27a0ec 3950 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
3b9d4ed2 3951 mutex_init(&sbi->s_orphan_lock);
ac27a0ec
DK		 3952
3953 sb->s_root = NULL;
3954
3955 needs_recovery = (es->s_last_orphan != 0 ||
e2b911c5 3956 ext4_has_feature_journal_needs_recovery(sb));
ac27a0ec 3957
e2b911c5 3958 if (ext4_has_feature_mmp(sb) && !(sb->s_flags & MS_RDONLY))
c5e06d10 3959 if (ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block)))
50460fe8 3960 goto failed_mount3a;
c5e06d10 3961
ac27a0ec
DK		 3962 /*
3963 * The first inode we look at is the journal inode. Don't try
3964 * root first: it may be modified in the journal!
3965 */
e2b911c5 3966 if (!test_opt(sb, NOLOAD) && ext4_has_feature_journal(sb)) {
4753d8a2
TT		 3967 err = ext4_load_journal(sb, es, journal_devnum);
3968 if (err)
50460fe8 3969 goto failed_mount3a;
0390131b 3970 } else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) &&
e2b911c5 3971 ext4_has_feature_journal_needs_recovery(sb)) {
b31e1552
ES		 3972 ext4_msg(sb, KERN_ERR, "required journal recovery "
3973 "suppressed and not mounted read-only");
744692dc 3974 goto failed_mount_wq;
ac27a0ec 3975 } else {
1e381f60
DM		 3976 /* Nojournal mode, all journal mount options are illegal */
3977 if (test_opt2(sb, EXPLICIT_JOURNAL_CHECKSUM)) {
3978 ext4_msg(sb, KERN_ERR, "can't mount with "
3979 "journal_checksum, fs mounted w/o journal");
3980 goto failed_mount_wq;
3981 }
3982 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
3983 ext4_msg(sb, KERN_ERR, "can't mount with "
3984 "journal_async_commit, fs mounted w/o journal");
3985 goto failed_mount_wq;
3986 }
3987 if (sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) {
3988 ext4_msg(sb, KERN_ERR, "can't mount with "
3989 "commit=%lu, fs mounted w/o journal",
3990 sbi->s_commit_interval / HZ);
3991 goto failed_mount_wq;
3992 }
3993 if (EXT4_MOUNT_DATA_FLAGS &
3994 (sbi->s_mount_opt ^ sbi->s_def_mount_opt)) {
3995 ext4_msg(sb, KERN_ERR, "can't mount with "
3996 "data=, fs mounted w/o journal");
3997 goto failed_mount_wq;
3998 }
3999 sbi->s_def_mount_opt &= EXT4_MOUNT_JOURNAL_CHECKSUM;
4000 clear_opt(sb, JOURNAL_CHECKSUM);
fd8c37ec 4001 clear_opt(sb, DATA_FLAGS);
0390131b
FM		 4002 sbi->s_journal = NULL;
4003 needs_recovery = 0;
4004 goto no_journal;
ac27a0ec
DK		 4005 }
4006
e2b911c5 4007 if (ext4_has_feature_64bit(sb) &&
eb40a09c
JS		 4008 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
4009 JBD2_FEATURE_INCOMPAT_64BIT)) {
b31e1552 4010 ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
744692dc 4011 goto failed_mount_wq;
eb40a09c
JS		 4012 }
4013
25ed6e8a
DW		 4014 if (!set_journal_csum_feature_set(sb)) {
4015 ext4_msg(sb, KERN_ERR, "Failed to set journal checksum "
4016 "feature set");
4017 goto failed_mount_wq;
d4da6c9c 4018 }
818d276c 4019
ac27a0ec
DK		 4020 /* We have now updated the journal if required, so we can
4021 * validate the data journaling mode. */
4022 switch (test_opt(sb, DATA_FLAGS)) {
4023 case 0:
4024 /* No mode set, assume a default based on the journal
63f57933
AM		 4025 * capabilities: ORDERED_DATA if the journal can
4026 * cope, else JOURNAL_DATA
4027 */
dab291af
MC		 4028 if (jbd2_journal_check_available_features
4029 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
fd8c37ec 4030 set_opt(sb, ORDERED_DATA);
ac27a0ec 4031 else
fd8c37ec 4032 set_opt(sb, JOURNAL_DATA);
ac27a0ec
DK		 4033 break;
4034
617ba13b
MC		 4035 case EXT4_MOUNT_ORDERED_DATA:
4036 case EXT4_MOUNT_WRITEBACK_DATA:
dab291af
MC		 4037 if (!jbd2_journal_check_available_features
4038 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
b31e1552
ES		 4039 ext4_msg(sb, KERN_ERR, "Journal does not support "
4040 "requested data journaling mode");
744692dc 4041 goto failed_mount_wq;
ac27a0ec
DK		 4042 }
4043 default:
4044 break;
4045 }
ab04df78
JK		 4046
4047 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA &&
4048 test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
4049 ext4_msg(sb, KERN_ERR, "can't mount with "
4050 "journal_async_commit in data=ordered mode");
4051 goto failed_mount_wq;
4052 }
4053
b3881f74 4054 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
ac27a0ec 4055
18aadd47
BJ		 4056 sbi->s_journal->j_commit_callback = ext4_journal_commit_callback;
4057
ce7e010a 4058no_journal:
2335d05f
AG		 4059 sbi->s_mb_cache = ext4_xattr_create_cache();
4060 if (!sbi->s_mb_cache) {
4061 ext4_msg(sb, KERN_ERR, "Failed to create an mb_cache");
4062 goto failed_mount_wq;
9c191f70
M		 4063 }
4064
e2b911c5 4065 if ((DUMMY_ENCRYPTION_ENABLED(sbi) || ext4_has_feature_encrypt(sb)) &&
09cbfeaf 4066 (blocksize != PAGE_SIZE)) {
1cb767cd
TT		 4067 ext4_msg(sb, KERN_ERR,
4068 "Unsupported blocksize for fs encryption");
4069 goto failed_mount_wq;
4070 }
4071
e2b911c5
DW		 4072 if (DUMMY_ENCRYPTION_ENABLED(sbi) && !(sb->s_flags & MS_RDONLY) &&
4073 !ext4_has_feature_encrypt(sb)) {
4074 ext4_set_feature_encrypt(sb);
6ddb2447
TT		 4075 ext4_commit_super(sb, 1);
4076 }
4077
952fc18e
TT		 4078 /*
4079 * Get the # of file system overhead blocks from the
4080 * superblock if present.
4081 */
4082 if (es->s_overhead_clusters)
4083 sbi->s_overhead = le32_to_cpu(es->s_overhead_clusters);
4084 else {
07aa2ea1
LC		 4085 err = ext4_calculate_overhead(sb);
4086 if (err)
952fc18e
TT		 4087 goto failed_mount_wq;
4088 }
4089
fd89d5f2
TH		 4090 /*
4091 * The maximum number of concurrent works can be high and
4092 * concurrency isn't really necessary. Limit it to 1.
4093 */
2e8fa54e
JK		 4094 EXT4_SB(sb)->rsv_conversion_wq =
4095 alloc_workqueue("ext4-rsv-conversion", WQ_MEM_RECLAIM | WQ_UNBOUND, 1);
4096 if (!EXT4_SB(sb)->rsv_conversion_wq) {
4097 printk(KERN_ERR "EXT4-fs: failed to create workqueue\n");
07aa2ea1 4098 ret = -ENOMEM;
2e8fa54e
JK		 4099 goto failed_mount4;
4100 }
4101
ac27a0ec 4102 /*
dab291af 4103 * The jbd2_journal_load will have done any necessary log recovery,
ac27a0ec
DK		 4104 * so we can safely mount the rest of the filesystem now.
4105 */
4106
1d1fe1ee
DH		 4107 root = ext4_iget(sb, EXT4_ROOT_INO);
4108 if (IS_ERR(root)) {
b31e1552 4109 ext4_msg(sb, KERN_ERR, "get root inode failed");
1d1fe1ee 4110 ret = PTR_ERR(root);
32a9bb57 4111 root = NULL;
ac27a0ec
DK		 4112 goto failed_mount4;
4113 }
4114 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
b31e1552 4115 ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
94bf608a 4116 iput(root);
ac27a0ec
DK		 4117 goto failed_mount4;
4118 }
48fde701 4119 sb->s_root = d_make_root(root);
1d1fe1ee 4120 if (!sb->s_root) {
b31e1552 4121 ext4_msg(sb, KERN_ERR, "get root dentry failed");
1d1fe1ee
DH		 4122 ret = -ENOMEM;
4123 goto failed_mount4;
4124 }
ac27a0ec 4125
7e84b621
ES		 4126 if (ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY))
4127 sb->s_flags |= MS_RDONLY;
ef7f3835
KS		 4128
4129 /* determine the minimum size of new large inodes, if present */
670e9875
TT		 4130 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE &&
4131 sbi->s_want_extra_isize == 0) {
ef7f3835
KS		 4132 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
4133 EXT4_GOOD_OLD_INODE_SIZE;
e2b911c5 4134 if (ext4_has_feature_extra_isize(sb)) {
ef7f3835
KS		 4135 if (sbi->s_want_extra_isize <
4136 le16_to_cpu(es->s_want_extra_isize))
4137 sbi->s_want_extra_isize =
4138 le16_to_cpu(es->s_want_extra_isize);
4139 if (sbi->s_want_extra_isize <
4140 le16_to_cpu(es->s_min_extra_isize))
4141 sbi->s_want_extra_isize =
4142 le16_to_cpu(es->s_min_extra_isize);
4143 }
4144 }
4145 /* Check if enough inode space is available */
4146 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
4147 sbi->s_inode_size) {
4148 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
4149 EXT4_GOOD_OLD_INODE_SIZE;
b31e1552
ES		 4150 ext4_msg(sb, KERN_INFO, "required extra inode space not"
4151 "available");
ef7f3835
KS		 4152 }
4153
b5799018 4154 ext4_set_resv_clusters(sb);
27dd4385 4155
6fd058f7
TT		 4156 err = ext4_setup_system_zone(sb);
4157 if (err) {
b31e1552 4158 ext4_msg(sb, KERN_ERR, "failed to initialize system "
fbe845dd 4159 "zone (%d)", err);
f9ae9cf5
TT		 4160 goto failed_mount4a;
4161 }
4162
4163 ext4_ext_init(sb);
4164 err = ext4_mb_init(sb);
4165 if (err) {
4166 ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)",
4167 err);
dcf2d804 4168 goto failed_mount5;
c2774d84
AK		 4169 }
4170
d5e03cbb
TT		 4171 block = ext4_count_free_clusters(sb);
4172 ext4_free_blocks_count_set(sbi->s_es,
4173 EXT4_C2B(sbi, block));
908c7f19
TH		 4174 err = percpu_counter_init(&sbi->s_freeclusters_counter, block,
4175 GFP_KERNEL);
d5e03cbb
TT		 4176 if (!err) {
4177 unsigned long freei = ext4_count_free_inodes(sb);
4178 sbi->s_es->s_free_inodes_count = cpu_to_le32(freei);
908c7f19
TH		 4179 err = percpu_counter_init(&sbi->s_freeinodes_counter, freei,
4180 GFP_KERNEL);
d5e03cbb
TT		 4181 }
4182 if (!err)
4183 err = percpu_counter_init(&sbi->s_dirs_counter,
908c7f19 4184 ext4_count_dirs(sb), GFP_KERNEL);
d5e03cbb 4185 if (!err)
908c7f19
TH		 4186 err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0,
4187 GFP_KERNEL);
c8585c6f
DJ		 4188 if (!err)
4189 err = percpu_init_rwsem(&sbi->s_journal_flag_rwsem);
4190
d5e03cbb
TT		 4191 if (err) {
4192 ext4_msg(sb, KERN_ERR, "insufficient memory");
4193 goto failed_mount6;
4194 }
4195
e2b911c5 4196 if (ext4_has_feature_flex_bg(sb))
d5e03cbb
TT		 4197 if (!ext4_fill_flex_info(sb)) {
4198 ext4_msg(sb, KERN_ERR,
4199 "unable to initialize "
4200 "flex_bg meta info!");
4201 goto failed_mount6;
4202 }
4203
bfff6873
LC		 4204 err = ext4_register_li_request(sb, first_not_zeroed);
4205 if (err)
dcf2d804 4206 goto failed_mount6;
bfff6873 4207
b5799018 4208 err = ext4_register_sysfs(sb);
dcf2d804
TM		 4209 if (err)
4210 goto failed_mount7;
3197ebdb 4211
9b2ff357
JK		 4212#ifdef CONFIG_QUOTA
4213 /* Enable quota usage during mount. */
e2b911c5 4214 if (ext4_has_feature_quota(sb) && !(sb->s_flags & MS_RDONLY)) {
9b2ff357
JK		 4215 err = ext4_enable_quotas(sb);
4216 if (err)
4217 goto failed_mount8;
4218 }
4219#endif /* CONFIG_QUOTA */
4220
617ba13b
MC		 4221 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
4222 ext4_orphan_cleanup(sb, es);
4223 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
0390131b 4224 if (needs_recovery) {
b31e1552 4225 ext4_msg(sb, KERN_INFO, "recovery complete");
0390131b
FM		 4226 ext4_mark_recovery_complete(sb, es);
4227 }
4228 if (EXT4_SB(sb)->s_journal) {
4229 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
4230 descr = " journalled data mode";
4231 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
4232 descr = " ordered data mode";
4233 else
4234 descr = " writeback data mode";
4235 } else
4236 descr = "out journal";
4237
79add3a3
LC		 4238 if (test_opt(sb, DISCARD)) {
4239 struct request_queue *q = bdev_get_queue(sb->s_bdev);
4240 if (!blk_queue_discard(q))
4241 ext4_msg(sb, KERN_WARNING,
4242 "mounting with \"discard\" option, but "
4243 "the device does not support discard");
4244 }
4245
e294a537
TT		 4246 if (___ratelimit(&ext4_mount_msg_ratelimit, "EXT4-fs mount"))
4247 ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. "
5aee0f8a
TT		 4248 "Opts: %.*s%s%s", descr,
4249 (int) sizeof(sbi->s_es->s_mount_opts),
4250 sbi->s_es->s_mount_opts,
e294a537 4251 *sbi->s_es->s_mount_opts ? "; " : "", orig_data);
ac27a0ec 4252
66e61a9e
TT		 4253 if (es->s_error_count)
4254 mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */
ac27a0ec 4255
efbed4dc
TT		 4256 /* Enable message ratelimiting. Default is 10 messages per 5 secs. */
4257 ratelimit_state_init(&sbi->s_err_ratelimit_state, 5 * HZ, 10);
4258 ratelimit_state_init(&sbi->s_warning_ratelimit_state, 5 * HZ, 10);
4259 ratelimit_state_init(&sbi->s_msg_ratelimit_state, 5 * HZ, 10);
4260
d4c402d9 4261 kfree(orig_data);
ac27a0ec
DK		 4262 return 0;
4263
617ba13b 4264cantfind_ext4:
ac27a0ec 4265 if (!silent)
b31e1552 4266 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
ac27a0ec
DK		 4267 goto failed_mount;
4268
72ba7450
TT		 4269#ifdef CONFIG_QUOTA
4270failed_mount8:
ebd173be 4271 ext4_unregister_sysfs(sb);
72ba7450 4272#endif
dcf2d804
TM		 4273failed_mount7:
4274 ext4_unregister_li_request(sb);
4275failed_mount6:
f9ae9cf5 4276 ext4_mb_release(sb);
d5e03cbb 4277 if (sbi->s_flex_groups)
b93b41d4 4278 kvfree(sbi->s_flex_groups);
d5e03cbb
TT		 4279 percpu_counter_destroy(&sbi->s_freeclusters_counter);
4280 percpu_counter_destroy(&sbi->s_freeinodes_counter);
4281 percpu_counter_destroy(&sbi->s_dirs_counter);
4282 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
00764937 4283failed_mount5:
f9ae9cf5
TT		 4284 ext4_ext_release(sb);
4285 ext4_release_system_zone(sb);
4286failed_mount4a:
94bf608a 4287 dput(sb->s_root);
32a9bb57 4288 sb->s_root = NULL;
94bf608a 4289failed_mount4:
b31e1552 4290 ext4_msg(sb, KERN_ERR, "mount failed");
2e8fa54e
JK		 4291 if (EXT4_SB(sb)->rsv_conversion_wq)
4292 destroy_workqueue(EXT4_SB(sb)->rsv_conversion_wq);
4c0425ff 4293failed_mount_wq:
82939d79
JK		 4294 if (sbi->s_mb_cache) {
4295 ext4_xattr_destroy_cache(sbi->s_mb_cache);
4296 sbi->s_mb_cache = NULL;
4297 }
0390131b
FM		 4298 if (sbi->s_journal) {
4299 jbd2_journal_destroy(sbi->s_journal);
4300 sbi->s_journal = NULL;
4301 }
50460fe8 4302failed_mount3a:
d3922a77 4303 ext4_es_unregister_shrinker(sbi);
eb68d0e2 4304failed_mount3:
9105bb14 4305 del_timer_sync(&sbi->s_err_report);
c5e06d10
JL		 4306 if (sbi->s_mmp_tsk)
4307 kthread_stop(sbi->s_mmp_tsk);
ac27a0ec
DK		 4308failed_mount2:
4309 for (i = 0; i < db_count; i++)
4310 brelse(sbi->s_group_desc[i]);
b93b41d4 4311 kvfree(sbi->s_group_desc);
ac27a0ec 4312failed_mount:
0441984a
DW		 4313 if (sbi->s_chksum_driver)
4314 crypto_free_shash(sbi->s_chksum_driver);
ac27a0ec 4315#ifdef CONFIG_QUOTA
a2d4a646 4316 for (i = 0; i < EXT4_MAXQUOTAS; i++)
ac27a0ec
DK		 4317 kfree(sbi->s_qf_names[i]);
4318#endif
617ba13b 4319 ext4_blkdev_remove(sbi);
ac27a0ec
DK		 4320 brelse(bh);
4321out_fail:
4322 sb->s_fs_info = NULL;
f6830165 4323 kfree(sbi->s_blockgroup_lock);
5aee0f8a 4324out_free_base:
ac27a0ec 4325 kfree(sbi);
d4c402d9 4326 kfree(orig_data);
07aa2ea1 4327 return err ? err : ret;
ac27a0ec
DK		 4328}
4329
4330/*
4331 * Setup any per-fs journal parameters now. We'll do this both on
4332 * initial mount, once the journal has been initialised but before we've
4333 * done any recovery; and again on any subsequent remount.
4334 */
617ba13b 4335static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
ac27a0ec 4336{
617ba13b 4337 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4338
30773840
TT		 4339 journal->j_commit_interval = sbi->s_commit_interval;
4340 journal->j_min_batch_time = sbi->s_min_batch_time;
4341 journal->j_max_batch_time = sbi->s_max_batch_time;
ac27a0ec 4342
a931da6a 4343 write_lock(&journal->j_state_lock);
ac27a0ec 4344 if (test_opt(sb, BARRIER))
dab291af 4345 journal->j_flags |= JBD2_BARRIER;
ac27a0ec 4346 else
dab291af 4347 journal->j_flags &= ~JBD2_BARRIER;
5bf5683a
HK		 4348 if (test_opt(sb, DATA_ERR_ABORT))
4349 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
4350 else
4351 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
a931da6a 4352 write_unlock(&journal->j_state_lock);
ac27a0ec
DK		 4353}
4354
c6cb7e77
EW		 4355static struct inode *ext4_get_journal_inode(struct super_block *sb,
4356 unsigned int journal_inum)
ac27a0ec
DK		 4357{
4358 struct inode *journal_inode;
ac27a0ec 4359
c6cb7e77
EW		 4360 /*
4361 * Test for the existence of a valid inode on disk. Bad things
4362 * happen if we iget() an unused inode, as the subsequent iput()
4363 * will try to delete it.
4364 */
1d1fe1ee
DH		 4365 journal_inode = ext4_iget(sb, journal_inum);
4366 if (IS_ERR(journal_inode)) {
b31e1552 4367 ext4_msg(sb, KERN_ERR, "no journal found");
ac27a0ec
DK		 4368 return NULL;
4369 }
4370 if (!journal_inode->i_nlink) {
4371 make_bad_inode(journal_inode);
4372 iput(journal_inode);
b31e1552 4373 ext4_msg(sb, KERN_ERR, "journal inode is deleted");
ac27a0ec
DK		 4374 return NULL;
4375 }
4376
e5f8eab8 4377 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
ac27a0ec 4378 journal_inode, journal_inode->i_size);
1d1fe1ee 4379 if (!S_ISREG(journal_inode->i_mode)) {
b31e1552 4380 ext4_msg(sb, KERN_ERR, "invalid journal inode");
ac27a0ec
DK		 4381 iput(journal_inode);
4382 return NULL;
4383 }
c6cb7e77
EW		 4384 return journal_inode;
4385}
4386
4387static journal_t *ext4_get_journal(struct super_block *sb,
4388 unsigned int journal_inum)
4389{
4390 struct inode *journal_inode;
4391 journal_t *journal;
4392
4393 BUG_ON(!ext4_has_feature_journal(sb));
4394
4395 journal_inode = ext4_get_journal_inode(sb, journal_inum);
4396 if (!journal_inode)
4397 return NULL;
ac27a0ec 4398
dab291af 4399 journal = jbd2_journal_init_inode(journal_inode);
ac27a0ec 4400 if (!journal) {
b31e1552 4401 ext4_msg(sb, KERN_ERR, "Could not load journal inode");
ac27a0ec
DK		 4402 iput(journal_inode);
4403 return NULL;
4404 }
4405 journal->j_private = sb;
617ba13b 4406 ext4_init_journal_params(sb, journal);
ac27a0ec
DK		 4407 return journal;
4408}
4409
617ba13b 4410static journal_t *ext4_get_dev_journal(struct super_block *sb,
ac27a0ec
DK		 4411 dev_t j_dev)
4412{
2b2d6d01 4413 struct buffer_head *bh;
ac27a0ec 4414 journal_t *journal;
617ba13b
MC		 4415 ext4_fsblk_t start;
4416 ext4_fsblk_t len;
ac27a0ec 4417 int hblock, blocksize;
617ba13b 4418 ext4_fsblk_t sb_block;
ac27a0ec 4419 unsigned long offset;
2b2d6d01 4420 struct ext4_super_block *es;
ac27a0ec
DK		 4421 struct block_device *bdev;
4422
e2b911c5 4423 BUG_ON(!ext4_has_feature_journal(sb));
0390131b 4424
b31e1552 4425 bdev = ext4_blkdev_get(j_dev, sb);
ac27a0ec
DK		 4426 if (bdev == NULL)
4427 return NULL;
4428
ac27a0ec 4429 blocksize = sb->s_blocksize;
e1defc4f 4430 hblock = bdev_logical_block_size(bdev);
ac27a0ec 4431 if (blocksize < hblock) {
b31e1552
ES		 4432 ext4_msg(sb, KERN_ERR,
4433 "blocksize too small for journal device");
ac27a0ec
DK		 4434 goto out_bdev;
4435 }
4436
617ba13b
MC		 4437 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
4438 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
ac27a0ec
DK		 4439 set_blocksize(bdev, blocksize);
4440 if (!(bh = __bread(bdev, sb_block, blocksize))) {
b31e1552
ES		 4441 ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
4442 "external journal");
ac27a0ec
DK		 4443 goto out_bdev;
4444 }
4445
2716b802 4446 es = (struct ext4_super_block *) (bh->b_data + offset);
617ba13b 4447 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
ac27a0ec 4448 !(le32_to_cpu(es->s_feature_incompat) &
617ba13b 4449 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
b31e1552
ES		 4450 ext4_msg(sb, KERN_ERR, "external journal has "
4451 "bad superblock");
ac27a0ec
DK		 4452 brelse(bh);
4453 goto out_bdev;
4454 }
4455
df4763be
DW		 4456 if ((le32_to_cpu(es->s_feature_ro_compat) &
4457 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) &&
4458 es->s_checksum != ext4_superblock_csum(sb, es)) {
4459 ext4_msg(sb, KERN_ERR, "external journal has "
4460 "corrupt superblock");
4461 brelse(bh);
4462 goto out_bdev;
4463 }
4464
617ba13b 4465 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
b31e1552 4466 ext4_msg(sb, KERN_ERR, "journal UUID does not match");
ac27a0ec
DK		 4467 brelse(bh);
4468 goto out_bdev;
4469 }
4470
bd81d8ee 4471 len = ext4_blocks_count(es);
ac27a0ec
DK		 4472 start = sb_block + 1;
4473 brelse(bh); /* we're done with the superblock */
4474
dab291af 4475 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
ac27a0ec
DK		 4476 start, len, blocksize);
4477 if (!journal) {
b31e1552 4478 ext4_msg(sb, KERN_ERR, "failed to create device journal");
ac27a0ec
DK		 4479 goto out_bdev;
4480 }
4481 journal->j_private = sb;
dfec8a14 4482 ll_rw_block(REQ_OP_READ, REQ_META | REQ_PRIO, 1, &journal->j_sb_buffer);
ac27a0ec
DK		 4483 wait_on_buffer(journal->j_sb_buffer);
4484 if (!buffer_uptodate(journal->j_sb_buffer)) {
b31e1552 4485 ext4_msg(sb, KERN_ERR, "I/O error on journal device");
ac27a0ec
DK		 4486 goto out_journal;
4487 }
4488 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
b31e1552
ES		 4489 ext4_msg(sb, KERN_ERR, "External journal has more than one "
4490 "user (unsupported) - %d",
ac27a0ec
DK		 4491 be32_to_cpu(journal->j_superblock->s_nr_users));
4492 goto out_journal;
4493 }
617ba13b
MC		 4494 EXT4_SB(sb)->journal_bdev = bdev;
4495 ext4_init_journal_params(sb, journal);
ac27a0ec 4496 return journal;
0b8e58a1 4497
ac27a0ec 4498out_journal:
dab291af 4499 jbd2_journal_destroy(journal);
ac27a0ec 4500out_bdev:
617ba13b 4501 ext4_blkdev_put(bdev);
ac27a0ec
DK		 4502 return NULL;
4503}
4504
617ba13b
MC		 4505static int ext4_load_journal(struct super_block *sb,
4506 struct ext4_super_block *es,
ac27a0ec
DK		 4507 unsigned long journal_devnum)
4508{
4509 journal_t *journal;
4510 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
4511 dev_t journal_dev;
4512 int err = 0;
4513 int really_read_only;
4514
e2b911c5 4515 BUG_ON(!ext4_has_feature_journal(sb));
0390131b 4516
ac27a0ec
DK		 4517 if (journal_devnum &&
4518 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
b31e1552
ES		 4519 ext4_msg(sb, KERN_INFO, "external journal device major/minor "
4520 "numbers have changed");
ac27a0ec
DK		 4521 journal_dev = new_decode_dev(journal_devnum);
4522 } else
4523 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
4524
4525 really_read_only = bdev_read_only(sb->s_bdev);
4526
4527 /*
4528 * Are we loading a blank journal or performing recovery after a
4529 * crash? For recovery, we need to check in advance whether we
4530 * can get read-write access to the device.
4531 */
e2b911c5 4532 if (ext4_has_feature_journal_needs_recovery(sb)) {
ac27a0ec 4533 if (sb->s_flags & MS_RDONLY) {
b31e1552
ES		 4534 ext4_msg(sb, KERN_INFO, "INFO: recovery "
4535 "required on readonly filesystem");
ac27a0ec 4536 if (really_read_only) {
b31e1552
ES		 4537 ext4_msg(sb, KERN_ERR, "write access "
4538 "unavailable, cannot proceed");
ac27a0ec
DK		 4539 return -EROFS;
4540 }
b31e1552
ES		 4541 ext4_msg(sb, KERN_INFO, "write access will "
4542 "be enabled during recovery");
ac27a0ec
DK		 4543 }
4544 }
4545
4546 if (journal_inum && journal_dev) {
b31e1552
ES		 4547 ext4_msg(sb, KERN_ERR, "filesystem has both journal "
4548 "and inode journals!");
ac27a0ec
DK		 4549 return -EINVAL;
4550 }
4551
4552 if (journal_inum) {
617ba13b 4553 if (!(journal = ext4_get_journal(sb, journal_inum)))
ac27a0ec
DK		 4554 return -EINVAL;
4555 } else {
617ba13b 4556 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
ac27a0ec
DK		 4557 return -EINVAL;
4558 }
4559
90576c0b 4560 if (!(journal->j_flags & JBD2_BARRIER))
b31e1552 4561 ext4_msg(sb, KERN_INFO, "barriers disabled");
4776004f 4562
e2b911c5 4563 if (!ext4_has_feature_journal_needs_recovery(sb))
dab291af 4564 err = jbd2_journal_wipe(journal, !really_read_only);
1c13d5c0
TT		 4565 if (!err) {
4566 char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL);
4567 if (save)
4568 memcpy(save, ((char *) es) +
4569 EXT4_S_ERR_START, EXT4_S_ERR_LEN);
dab291af 4570 err = jbd2_journal_load(journal);
1c13d5c0
TT		 4571 if (save)
4572 memcpy(((char *) es) + EXT4_S_ERR_START,
4573 save, EXT4_S_ERR_LEN);
4574 kfree(save);
4575 }
ac27a0ec
DK		 4576
4577 if (err) {
b31e1552 4578 ext4_msg(sb, KERN_ERR, "error loading journal");
dab291af 4579 jbd2_journal_destroy(journal);
ac27a0ec
DK		 4580 return err;
4581 }
4582
617ba13b
MC		 4583 EXT4_SB(sb)->s_journal = journal;
4584 ext4_clear_journal_err(sb, es);
ac27a0ec 4585
c41303ce 4586 if (!really_read_only && journal_devnum &&
ac27a0ec
DK		 4587 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
4588 es->s_journal_dev = cpu_to_le32(journal_devnum);
ac27a0ec
DK		 4589
4590 /* Make sure we flush the recovery flag to disk. */
e2d67052 4591 ext4_commit_super(sb, 1);
ac27a0ec
DK		 4592 }
4593
4594 return 0;
4595}
4596
e2d67052 4597static int ext4_commit_super(struct super_block *sb, int sync)
ac27a0ec 4598{
e2d67052 4599 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
617ba13b 4600 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
c4be0c1d 4601 int error = 0;
ac27a0ec 4602
bdfe0cbd 4603 if (!sbh || block_device_ejected(sb))
c4be0c1d 4604 return error;
71290b36
TT		 4605 /*
4606 * If the file system is mounted read-only, don't update the
4607 * superblock write time. This avoids updating the superblock
4608 * write time when we are mounting the root file system
4609 * read/only but we need to replay the journal; at that point,
4610 * for people who are east of GMT and who make their clock
4611 * tick in localtime for Windows bug-for-bug compatibility,
4612 * the clock is set in the future, and this will cause e2fsck
4613 * to complain and force a full file system check.
4614 */
4615 if (!(sb->s_flags & MS_RDONLY))
4616 es->s_wtime = cpu_to_le32(get_seconds());
f613dfcb
TT		 4617 if (sb->s_bdev->bd_part)
4618 es->s_kbytes_written =
4619 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written +
afc32f7e
TT		 4620 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
4621 EXT4_SB(sb)->s_sectors_written_start) >> 1));
f613dfcb
TT		 4622 else
4623 es->s_kbytes_written =
4624 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written);
d5e03cbb
TT		 4625 if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeclusters_counter))
4626 ext4_free_blocks_count_set(es,
57042651
TT		 4627 EXT4_C2B(EXT4_SB(sb), percpu_counter_sum_positive(
4628 &EXT4_SB(sb)->s_freeclusters_counter)));
d5e03cbb
TT		 4629 if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeinodes_counter))
4630 es->s_free_inodes_count =
4631 cpu_to_le32(percpu_counter_sum_positive(
ce7e010a 4632 &EXT4_SB(sb)->s_freeinodes_counter));
ac27a0ec 4633 BUFFER_TRACE(sbh, "marking dirty");
06db49e6 4634 ext4_superblock_csum_set(sb);
1566a48a
TT		 4635 if (sync)
4636 lock_buffer(sbh);
4743f839
PKS		 4637 if (buffer_write_io_error(sbh)) {
4638 /*
4639 * Oh, dear. A previous attempt to write the
4640 * superblock failed. This could happen because the
4641 * USB device was yanked out. Or it could happen to
4642 * be a transient write error and maybe the block will
4643 * be remapped. Nothing we can do but to retry the
4644 * write and hope for the best.
4645 */
4646 ext4_msg(sb, KERN_ERR, "previous I/O error to "
4647 "superblock detected");
4648 clear_buffer_write_io_error(sbh);
4649 set_buffer_uptodate(sbh);
4650 }
ac27a0ec 4651 mark_buffer_dirty(sbh);
914258bf 4652 if (sync) {
1566a48a 4653 unlock_buffer(sbh);
564bc402 4654 error = __sync_dirty_buffer(sbh,
70fd7614 4655 test_opt(sb, BARRIER) ? REQ_FUA : REQ_SYNC);
c4be0c1d
TS		 4656 if (error)
4657 return error;
4658
4659 error = buffer_write_io_error(sbh);
4660 if (error) {
b31e1552
ES		 4661 ext4_msg(sb, KERN_ERR, "I/O error while writing "
4662 "superblock");
914258bf
TT		 4663 clear_buffer_write_io_error(sbh);
4664 set_buffer_uptodate(sbh);
4665 }
4666 }
c4be0c1d 4667 return error;
ac27a0ec
DK		 4668}
4669
ac27a0ec
DK		 4670/*
4671 * Have we just finished recovery? If so, and if we are mounting (or
4672 * remounting) the filesystem readonly, then we will end up with a
4673 * consistent fs on disk. Record that fact.
4674 */
2b2d6d01
TT		 4675static void ext4_mark_recovery_complete(struct super_block *sb,
4676 struct ext4_super_block *es)
ac27a0ec 4677{
617ba13b 4678 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 4679
e2b911c5 4680 if (!ext4_has_feature_journal(sb)) {
0390131b
FM		 4681 BUG_ON(journal != NULL);
4682 return;
4683 }
dab291af 4684 jbd2_journal_lock_updates(journal);
7ffe1ea8
HK		 4685 if (jbd2_journal_flush(journal) < 0)
4686 goto out;
4687
e2b911c5 4688 if (ext4_has_feature_journal_needs_recovery(sb) &&
ac27a0ec 4689 sb->s_flags & MS_RDONLY) {
e2b911c5 4690 ext4_clear_feature_journal_needs_recovery(sb);
e2d67052 4691 ext4_commit_super(sb, 1);
ac27a0ec 4692 }
7ffe1ea8
HK		 4693
4694out:
dab291af 4695 jbd2_journal_unlock_updates(journal);
ac27a0ec
DK		 4696}
4697
4698/*
4699 * If we are mounting (or read-write remounting) a filesystem whose journal
4700 * has recorded an error from a previous lifetime, move that error to the
4701 * main filesystem now.
4702 */
2b2d6d01
TT		 4703static void ext4_clear_journal_err(struct super_block *sb,
4704 struct ext4_super_block *es)
ac27a0ec
DK		 4705{
4706 journal_t *journal;
4707 int j_errno;
4708 const char *errstr;
4709
e2b911c5 4710 BUG_ON(!ext4_has_feature_journal(sb));
0390131b 4711
617ba13b 4712 journal = EXT4_SB(sb)->s_journal;
ac27a0ec
DK		 4713
4714 /*
4715 * Now check for any error status which may have been recorded in the
617ba13b 4716 * journal by a prior ext4_error() or ext4_abort()
ac27a0ec
DK		 4717 */
4718
dab291af 4719 j_errno = jbd2_journal_errno(journal);
ac27a0ec
DK		 4720 if (j_errno) {
4721 char nbuf[16];
4722
617ba13b 4723 errstr = ext4_decode_error(sb, j_errno, nbuf);
12062ddd 4724 ext4_warning(sb, "Filesystem error recorded "
ac27a0ec 4725 "from previous mount: %s", errstr);
12062ddd 4726 ext4_warning(sb, "Marking fs in need of filesystem check.");
ac27a0ec 4727
617ba13b
MC		 4728 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
4729 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
e2d67052 4730 ext4_commit_super(sb, 1);
ac27a0ec 4731
dab291af 4732 jbd2_journal_clear_err(journal);
d796c52e 4733 jbd2_journal_update_sb_errno(journal);
ac27a0ec
DK		 4734 }
4735}
4736
4737/*
4738 * Force the running and committing transactions to commit,
4739 * and wait on the commit.
4740 */
617ba13b 4741int ext4_force_commit(struct super_block *sb)
ac27a0ec
DK		 4742{
4743 journal_t *journal;
ac27a0ec
DK		 4744
4745 if (sb->s_flags & MS_RDONLY)
4746 return 0;
4747
617ba13b 4748 journal = EXT4_SB(sb)->s_journal;
b1deefc9 4749 return ext4_journal_force_commit(journal);
ac27a0ec
DK		 4750}
4751
617ba13b 4752static int ext4_sync_fs(struct super_block *sb, int wait)
ac27a0ec 4753{
14ce0cb4 4754 int ret = 0;
9eddacf9 4755 tid_t target;
06a407f1 4756 bool needs_barrier = false;
8d5d02e6 4757 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4758
0db1ff22
TT		 4759 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
4760 return 0;
4761
9bffad1e 4762 trace_ext4_sync_fs(sb, wait);
2e8fa54e 4763 flush_workqueue(sbi->rsv_conversion_wq);
a1177825
JK		 4764 /*
4765 * Writeback quota in non-journalled quota case - journalled quota has
4766 * no dirty dquots
4767 */
4768 dquot_writeback_dquots(sb, -1);
06a407f1
DM		 4769 /*
4770 * Data writeback is possible w/o journal transaction, so barrier must
4771 * being sent at the end of the function. But we can skip it if
4772 * transaction_commit will do it for us.
4773 */
bda32530
TT		 4774 if (sbi->s_journal) {
4775 target = jbd2_get_latest_transaction(sbi->s_journal);
4776 if (wait && sbi->s_journal->j_flags & JBD2_BARRIER &&
4777 !jbd2_trans_will_send_data_barrier(sbi->s_journal, target))
4778 needs_barrier = true;
4779
4780 if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
4781 if (wait)
4782 ret = jbd2_log_wait_commit(sbi->s_journal,
4783 target);
4784 }
4785 } else if (wait && test_opt(sb, BARRIER))
06a407f1 4786 needs_barrier = true;
06a407f1
DM		 4787 if (needs_barrier) {
4788 int err;
4789 err = blkdev_issue_flush(sb->s_bdev, GFP_KERNEL, NULL);
4790 if (!ret)
4791 ret = err;
0390131b 4792 }
06a407f1
DM		 4793
4794 return ret;
4795}
4796
ac27a0ec
DK		 4797/*
4798 * LVM calls this function before a (read-only) snapshot is created. This
4799 * gives us a chance to flush the journal completely and mark the fs clean.
be4f27d3
YY		 4800 *
4801 * Note that only this function cannot bring a filesystem to be in a clean
8e8ad8a5
JK		 4802 * state independently. It relies on upper layer to stop all data & metadata
4803 * modifications.
ac27a0ec 4804 */
c4be0c1d 4805static int ext4_freeze(struct super_block *sb)
ac27a0ec 4806{
c4be0c1d
TS		 4807 int error = 0;
4808 journal_t *journal;
ac27a0ec 4809
9ca92389
TT		 4810 if (sb->s_flags & MS_RDONLY)
4811 return 0;
ac27a0ec 4812
9ca92389 4813 journal = EXT4_SB(sb)->s_journal;
7ffe1ea8 4814
bb044576
TT		 4815 if (journal) {
4816 /* Now we set up the journal barrier. */
4817 jbd2_journal_lock_updates(journal);
ac27a0ec 4818
bb044576
TT		 4819 /*
4820 * Don't clear the needs_recovery flag if we failed to
4821 * flush the journal.
4822 */
4823 error = jbd2_journal_flush(journal);
4824 if (error < 0)
4825 goto out;
c642dc9e
ES		 4826
4827 /* Journal blocked and flushed, clear needs_recovery flag. */
e2b911c5 4828 ext4_clear_feature_journal_needs_recovery(sb);
bb044576 4829 }
9ca92389 4830
9ca92389 4831 error = ext4_commit_super(sb, 1);
6b0310fb 4832out:
bb044576
TT		 4833 if (journal)
4834 /* we rely on upper layer to stop further updates */
4835 jbd2_journal_unlock_updates(journal);
6b0310fb 4836 return error;
ac27a0ec
DK		 4837}
4838
4839/*
4840 * Called by LVM after the snapshot is done. We need to reset the RECOVER
4841 * flag here, even though the filesystem is not technically dirty yet.
4842 */
c4be0c1d 4843static int ext4_unfreeze(struct super_block *sb)
ac27a0ec 4844{
783d9485 4845 if ((sb->s_flags & MS_RDONLY) || ext4_forced_shutdown(EXT4_SB(sb)))
9ca92389
TT		 4846 return 0;
4847
c642dc9e
ES		 4848 if (EXT4_SB(sb)->s_journal) {
4849 /* Reset the needs_recovery flag before the fs is unlocked. */
e2b911c5 4850 ext4_set_feature_journal_needs_recovery(sb);
c642dc9e
ES		 4851 }
4852
9ca92389 4853 ext4_commit_super(sb, 1);
c4be0c1d 4854 return 0;
ac27a0ec
DK		 4855}
4856
673c6100
TT		 4857/*
4858 * Structure to save mount options for ext4_remount's benefit
4859 */
4860struct ext4_mount_options {
4861 unsigned long s_mount_opt;
a2595b8a 4862 unsigned long s_mount_opt2;
08cefc7a
EB		 4863 kuid_t s_resuid;
4864 kgid_t s_resgid;
673c6100
TT		 4865 unsigned long s_commit_interval;
4866 u32 s_min_batch_time, s_max_batch_time;
4867#ifdef CONFIG_QUOTA
4868 int s_jquota_fmt;
a2d4a646 4869 char *s_qf_names[EXT4_MAXQUOTAS];
673c6100
TT		 4870#endif
4871};
4872
2b2d6d01 4873static int ext4_remount(struct super_block *sb, int *flags, char *data)
ac27a0ec 4874{
2b2d6d01 4875 struct ext4_super_block *es;
617ba13b 4876 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4877 unsigned long old_sb_flags;
617ba13b 4878 struct ext4_mount_options old_opts;
c79d967d 4879 int enable_quota = 0;
8a266467 4880 ext4_group_t g;
b3881f74 4881 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
c5e06d10 4882 int err = 0;
ac27a0ec 4883#ifdef CONFIG_QUOTA
03dafb5f 4884 int i, j;
ac27a0ec 4885#endif
d4c402d9 4886 char *orig_data = kstrdup(data, GFP_KERNEL);
ac27a0ec
DK		 4887
4888 /* Store the original options */
4889 old_sb_flags = sb->s_flags;
4890 old_opts.s_mount_opt = sbi->s_mount_opt;
a2595b8a 4891 old_opts.s_mount_opt2 = sbi->s_mount_opt2;
ac27a0ec
DK		 4892 old_opts.s_resuid = sbi->s_resuid;
4893 old_opts.s_resgid = sbi->s_resgid;
4894 old_opts.s_commit_interval = sbi->s_commit_interval;
30773840
TT		 4895 old_opts.s_min_batch_time = sbi->s_min_batch_time;
4896 old_opts.s_max_batch_time = sbi->s_max_batch_time;
ac27a0ec
DK		 4897#ifdef CONFIG_QUOTA
4898 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
a2d4a646 4899 for (i = 0; i < EXT4_MAXQUOTAS; i++)
03dafb5f
CG		 4900 if (sbi->s_qf_names[i]) {
4901 old_opts.s_qf_names[i] = kstrdup(sbi->s_qf_names[i],
4902 GFP_KERNEL);
4903 if (!old_opts.s_qf_names[i]) {
4904 for (j = 0; j < i; j++)
4905 kfree(old_opts.s_qf_names[j]);
3e36a163 4906 kfree(orig_data);
03dafb5f
CG		 4907 return -ENOMEM;
4908 }
4909 } else
4910 old_opts.s_qf_names[i] = NULL;
ac27a0ec 4911#endif
b3881f74
TT		 4912 if (sbi->s_journal && sbi->s_journal->j_task->io_context)
4913 journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
ac27a0ec 4914
661aa520 4915 if (!parse_options(data, sb, NULL, &journal_ioprio, 1)) {
ac27a0ec
DK		 4916 err = -EINVAL;
4917 goto restore_opts;
4918 }
4919
6b992ff2 4920 if ((old_opts.s_mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) ^
c6d3d56d
DW		 4921 test_opt(sb, JOURNAL_CHECKSUM)) {
4922 ext4_msg(sb, KERN_ERR, "changing journal_checksum "
2d5b86e0
ES		 4923 "during remount not supported; ignoring");
4924 sbi->s_mount_opt ^= EXT4_MOUNT_JOURNAL_CHECKSUM;
6b992ff2
DW		 4925 }
4926
6ae6514b
PS		 4927 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
4928 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
4929 ext4_msg(sb, KERN_ERR, "can't mount with "
4930 "both data=journal and delalloc");
4931 err = -EINVAL;
4932 goto restore_opts;
4933 }
4934 if (test_opt(sb, DIOREAD_NOLOCK)) {
4935 ext4_msg(sb, KERN_ERR, "can't mount with "
4936 "both data=journal and dioread_nolock");
4937 err = -EINVAL;
4938 goto restore_opts;
4939 }
923ae0ff
RZ		 4940 if (test_opt(sb, DAX)) {
4941 ext4_msg(sb, KERN_ERR, "can't mount with "
4942 "both data=journal and dax");
4943 err = -EINVAL;
4944 goto restore_opts;
4945 }
ab04df78
JK		 4946 } else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) {
4947 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
4948 ext4_msg(sb, KERN_ERR, "can't mount with "
4949 "journal_async_commit in data=ordered mode");
4950 err = -EINVAL;
4951 goto restore_opts;
4952 }
923ae0ff
RZ		 4953 }
4954
4955 if ((sbi->s_mount_opt ^ old_opts.s_mount_opt) & EXT4_MOUNT_DAX) {
4956 ext4_msg(sb, KERN_WARNING, "warning: refusing change of "
4957 "dax flag with busy inodes while remounting");
4958 sbi->s_mount_opt ^= EXT4_MOUNT_DAX;
6ae6514b
PS		 4959 }
4960
4ab2f15b 4961 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
c67d859e 4962 ext4_abort(sb, "Abort forced by user");
ac27a0ec
DK		 4963
4964 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
482a7425 4965 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec
DK		 4966
4967 es = sbi->s_es;
4968
b3881f74 4969 if (sbi->s_journal) {
0390131b 4970 ext4_init_journal_params(sb, sbi->s_journal);
b3881f74
TT		 4971 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
4972 }
ac27a0ec 4973
a2fd66d0
TT		 4974 if (*flags & MS_LAZYTIME)
4975 sb->s_flags |= MS_LAZYTIME;
4976
661aa520 4977 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
4ab2f15b 4978 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) {
ac27a0ec
DK		 4979 err = -EROFS;
4980 goto restore_opts;
4981 }
4982
4983 if (*flags & MS_RDONLY) {
38c03b34
TT		 4984 err = sync_filesystem(sb);
4985 if (err < 0)
4986 goto restore_opts;
0f0dd62f
CH		 4987 err = dquot_suspend(sb, -1);
4988 if (err < 0)
c79d967d 4989 goto restore_opts;
c79d967d 4990
ac27a0ec
DK		 4991 /*
4992 * First of all, the unconditional stuff we have to do
4993 * to disable replay of the journal when we next remount
4994 */
4995 sb->s_flags |= MS_RDONLY;
4996
4997 /*
4998 * OK, test if we are remounting a valid rw partition
4999 * readonly, and if so set the rdonly flag and then
5000 * mark the partition as valid again.
5001 */
617ba13b
MC		 5002 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
5003 (sbi->s_mount_state & EXT4_VALID_FS))
ac27a0ec
DK		 5004 es->s_state = cpu_to_le16(sbi->s_mount_state);
5005
a63c9eb2 5006 if (sbi->s_journal)
0390131b 5007 ext4_mark_recovery_complete(sb, es);
ac27a0ec 5008 } else {
a13fb1a4 5009 /* Make sure we can mount this feature set readwrite */
e2b911c5 5010 if (ext4_has_feature_readonly(sb) ||
2cb5cc8b 5011 !ext4_feature_set_ok(sb, 0)) {
ac27a0ec
DK		 5012 err = -EROFS;
5013 goto restore_opts;
5014 }
8a266467
TT		 5015 /*
5016 * Make sure the group descriptor checksums
0b8e58a1 5017 * are sane. If they aren't, refuse to remount r/w.
8a266467
TT		 5018 */
5019 for (g = 0; g < sbi->s_groups_count; g++) {
5020 struct ext4_group_desc *gdp =
5021 ext4_get_group_desc(sb, g, NULL);
5022
feb0ab32 5023 if (!ext4_group_desc_csum_verify(sb, g, gdp)) {
b31e1552
ES		 5024 ext4_msg(sb, KERN_ERR,
5025 "ext4_remount: Checksum for group %u failed (%u!=%u)",
e2b911c5 5026 g, le16_to_cpu(ext4_group_desc_csum(sb, g, gdp)),
8a266467 5027 le16_to_cpu(gdp->bg_checksum));
6a797d27 5028 err = -EFSBADCRC;
8a266467
TT		 5029 goto restore_opts;
5030 }
5031 }
5032
ead6596b
ES		 5033 /*
5034 * If we have an unprocessed orphan list hanging
5035 * around from a previously readonly bdev mount,
5036 * require a full umount/remount for now.
5037 */
5038 if (es->s_last_orphan) {
b31e1552 5039 ext4_msg(sb, KERN_WARNING, "Couldn't "
ead6596b
ES		 5040 "remount RDWR because of unprocessed "
5041 "orphan inode list. Please "
b31e1552 5042 "umount/remount instead");
ead6596b
ES		 5043 err = -EINVAL;
5044 goto restore_opts;
5045 }
5046
ac27a0ec
DK		 5047 /*
5048 * Mounting a RDONLY partition read-write, so reread
5049 * and store the current valid flag. (It may have
5050 * been changed by e2fsck since we originally mounted
5051 * the partition.)
5052 */
0390131b
FM		 5053 if (sbi->s_journal)
5054 ext4_clear_journal_err(sb, es);
ac27a0ec 5055 sbi->s_mount_state = le16_to_cpu(es->s_state);
2b2d6d01 5056 if (!ext4_setup_super(sb, es, 0))
ac27a0ec 5057 sb->s_flags &= ~MS_RDONLY;
e2b911c5 5058 if (ext4_has_feature_mmp(sb))
c5e06d10
JL		 5059 if (ext4_multi_mount_protect(sb,
5060 le64_to_cpu(es->s_mmp_block))) {
5061 err = -EROFS;
5062 goto restore_opts;
5063 }
c79d967d 5064 enable_quota = 1;
ac27a0ec
DK		 5065 }
5066 }
bfff6873
LC		 5067
5068 /*
5069 * Reinitialize lazy itable initialization thread based on
5070 * current settings
5071 */
5072 if ((sb->s_flags & MS_RDONLY) || !test_opt(sb, INIT_INODE_TABLE))
5073 ext4_unregister_li_request(sb);
5074 else {
5075 ext4_group_t first_not_zeroed;
5076 first_not_zeroed = ext4_has_uninit_itable(sb);
5077 ext4_register_li_request(sb, first_not_zeroed);
5078 }
5079
6fd058f7 5080 ext4_setup_system_zone(sb);
d096ad0f 5081 if (sbi->s_journal == NULL && !(old_sb_flags & MS_RDONLY))
e2d67052 5082 ext4_commit_super(sb, 1);
0390131b 5083
ac27a0ec
DK		 5084#ifdef CONFIG_QUOTA
5085 /* Release old quota file names */
a2d4a646 5086 for (i = 0; i < EXT4_MAXQUOTAS; i++)
03dafb5f 5087 kfree(old_opts.s_qf_names[i]);
7c319d32
AK		 5088 if (enable_quota) {
5089 if (sb_any_quota_suspended(sb))
5090 dquot_resume(sb, -1);
e2b911c5 5091 else if (ext4_has_feature_quota(sb)) {
7c319d32 5092 err = ext4_enable_quotas(sb);
07724f98 5093 if (err)
7c319d32 5094 goto restore_opts;
7c319d32
AK		 5095 }
5096 }
ac27a0ec 5097#endif
d4c402d9 5098
a26f4992 5099 *flags = (*flags & ~MS_LAZYTIME) | (sb->s_flags & MS_LAZYTIME);
d4c402d9
CW		 5100 ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s", orig_data);
5101 kfree(orig_data);
ac27a0ec 5102 return 0;
0b8e58a1 5103
ac27a0ec
DK		 5104restore_opts:
5105 sb->s_flags = old_sb_flags;
5106 sbi->s_mount_opt = old_opts.s_mount_opt;
a2595b8a 5107 sbi->s_mount_opt2 = old_opts.s_mount_opt2;
ac27a0ec
DK		 5108 sbi->s_resuid = old_opts.s_resuid;
5109 sbi->s_resgid = old_opts.s_resgid;
5110 sbi->s_commit_interval = old_opts.s_commit_interval;
30773840
TT		 5111 sbi->s_min_batch_time = old_opts.s_min_batch_time;
5112 sbi->s_max_batch_time = old_opts.s_max_batch_time;
ac27a0ec
DK		 5113#ifdef CONFIG_QUOTA
5114 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
a2d4a646 5115 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
03dafb5f 5116 kfree(sbi->s_qf_names[i]);
ac27a0ec
DK		 5117 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
5118 }
5119#endif
d4c402d9 5120 kfree(orig_data);
ac27a0ec
DK		 5121 return err;
5122}
5123
689c958c
LX		 5124#ifdef CONFIG_QUOTA
5125static int ext4_statfs_project(struct super_block *sb,
5126 kprojid_t projid, struct kstatfs *buf)
5127{
5128 struct kqid qid;
5129 struct dquot *dquot;
5130 u64 limit;
5131 u64 curblock;
5132
5133 qid = make_kqid_projid(projid);
5134 dquot = dqget(sb, qid);
5135 if (IS_ERR(dquot))
5136 return PTR_ERR(dquot);
5137 spin_lock(&dq_data_lock);
5138
5139 limit = (dquot->dq_dqb.dqb_bsoftlimit ?
5140 dquot->dq_dqb.dqb_bsoftlimit :
5141 dquot->dq_dqb.dqb_bhardlimit) >> sb->s_blocksize_bits;
5142 if (limit && buf->f_blocks > limit) {
5143 curblock = dquot->dq_dqb.dqb_curspace >> sb->s_blocksize_bits;
5144 buf->f_blocks = limit;
5145 buf->f_bfree = buf->f_bavail =
5146 (buf->f_blocks > curblock) ?
5147 (buf->f_blocks - curblock) : 0;
5148 }
5149
5150 limit = dquot->dq_dqb.dqb_isoftlimit ?
5151 dquot->dq_dqb.dqb_isoftlimit :
5152 dquot->dq_dqb.dqb_ihardlimit;
5153 if (limit && buf->f_files > limit) {
5154 buf->f_files = limit;
5155 buf->f_ffree =
5156 (buf->f_files > dquot->dq_dqb.dqb_curinodes) ?
5157 (buf->f_files - dquot->dq_dqb.dqb_curinodes) : 0;
5158 }
5159
5160 spin_unlock(&dq_data_lock);
5161 dqput(dquot);
5162 return 0;
5163}
5164#endif
5165
2b2d6d01 5166static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
ac27a0ec
DK		 5167{
5168 struct super_block *sb = dentry->d_sb;
617ba13b
MC		 5169 struct ext4_sb_info *sbi = EXT4_SB(sb);
5170 struct ext4_super_block *es = sbi->s_es;
27dd4385 5171 ext4_fsblk_t overhead = 0, resv_blocks;
960cc398 5172 u64 fsid;
d02a9391 5173 s64 bfree;
27dd4385 5174 resv_blocks = EXT4_C2B(sbi, atomic64_read(&sbi->s_resv_clusters));
ac27a0ec 5175
952fc18e
TT		 5176 if (!test_opt(sb, MINIX_DF))
5177 overhead = sbi->s_overhead;
ac27a0ec 5178
617ba13b 5179 buf->f_type = EXT4_SUPER_MAGIC;
ac27a0ec 5180 buf->f_bsize = sb->s_blocksize;
b72f78cb 5181 buf->f_blocks = ext4_blocks_count(es) - EXT4_C2B(sbi, overhead);
57042651
TT		 5182 bfree = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) -
5183 percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter);
d02a9391 5184 /* prevent underflow in case that few free space is available */
57042651 5185 buf->f_bfree = EXT4_C2B(sbi, max_t(s64, bfree, 0));
27dd4385
LC		 5186 buf->f_bavail = buf->f_bfree -
5187 (ext4_r_blocks_count(es) + resv_blocks);
5188 if (buf->f_bfree < (ext4_r_blocks_count(es) + resv_blocks))
ac27a0ec
DK		 5189 buf->f_bavail = 0;
5190 buf->f_files = le32_to_cpu(es->s_inodes_count);
52d9f3b4 5191 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
617ba13b 5192 buf->f_namelen = EXT4_NAME_LEN;
960cc398
PE		 5193 fsid = le64_to_cpup((void *)es->s_uuid) ^
5194 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
5195 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
5196 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
0b8e58a1 5197
689c958c
LX		 5198#ifdef CONFIG_QUOTA
5199 if (ext4_test_inode_flag(dentry->d_inode, EXT4_INODE_PROJINHERIT) &&
5200 sb_has_quota_limits_enabled(sb, PRJQUOTA))
5201 ext4_statfs_project(sb, EXT4_I(dentry->d_inode)->i_projid, buf);
5202#endif
ac27a0ec
DK		 5203 return 0;
5204}
5205
0b8e58a1
AD		 5206/* Helper function for writing quotas on sync - we need to start transaction
5207 * before quota file is locked for write. Otherwise the are possible deadlocks:
ac27a0ec 5208 * Process 1 Process 2
617ba13b 5209 * ext4_create() quota_sync()
a269eb18 5210 * jbd2_journal_start() write_dquot()
871a2931 5211 * dquot_initialize() down(dqio_mutex)
dab291af 5212 * down(dqio_mutex) jbd2_journal_start()
ac27a0ec
DK		 5213 *
5214 */
5215
5216#ifdef CONFIG_QUOTA
5217
5218static inline struct inode *dquot_to_inode(struct dquot *dquot)
5219{
4c376dca 5220 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_id.type];
ac27a0ec
DK		 5221}
5222
617ba13b 5223static int ext4_write_dquot(struct dquot *dquot)
ac27a0ec
DK		 5224{
5225 int ret, err;
5226 handle_t *handle;
5227 struct inode *inode;
5228
5229 inode = dquot_to_inode(dquot);
9924a92a 5230 handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
0b8e58a1 5231 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 5232 if (IS_ERR(handle))
5233 return PTR_ERR(handle);
5234 ret = dquot_commit(dquot);
617ba13b 5235 err = ext4_journal_stop(handle);
ac27a0ec
DK		 5236 if (!ret)
5237 ret = err;
5238 return ret;
5239}
5240
617ba13b 5241static int ext4_acquire_dquot(struct dquot *dquot)
ac27a0ec
DK		 5242{
5243 int ret, err;
5244 handle_t *handle;
5245
9924a92a 5246 handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
0b8e58a1 5247 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 5248 if (IS_ERR(handle))
5249 return PTR_ERR(handle);
5250 ret = dquot_acquire(dquot);
617ba13b 5251 err = ext4_journal_stop(handle);
ac27a0ec
DK		 5252 if (!ret)
5253 ret = err;
5254 return ret;
5255}
5256
617ba13b 5257static int ext4_release_dquot(struct dquot *dquot)
ac27a0ec
DK		 5258{
5259 int ret, err;
5260 handle_t *handle;
5261
9924a92a 5262 handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
0b8e58a1 5263 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
9c3013e9
JK		 5264 if (IS_ERR(handle)) {
5265 /* Release dquot anyway to avoid endless cycle in dqput() */
5266 dquot_release(dquot);
ac27a0ec 5267 return PTR_ERR(handle);
9c3013e9 5268 }
ac27a0ec 5269 ret = dquot_release(dquot);
617ba13b 5270 err = ext4_journal_stop(handle);
ac27a0ec
DK		 5271 if (!ret)
5272 ret = err;
5273 return ret;
5274}
5275
617ba13b 5276static int ext4_mark_dquot_dirty(struct dquot *dquot)
ac27a0ec 5277{
262b4662
JK		 5278 struct super_block *sb = dquot->dq_sb;
5279 struct ext4_sb_info *sbi = EXT4_SB(sb);
5280
2c8be6b2 5281 /* Are we journaling quotas? */
e2b911c5 5282 if (ext4_has_feature_quota(sb) ||
262b4662 5283 sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
ac27a0ec 5284 dquot_mark_dquot_dirty(dquot);
617ba13b 5285 return ext4_write_dquot(dquot);
ac27a0ec
DK		 5286 } else {
5287 return dquot_mark_dquot_dirty(dquot);
5288 }
5289}
5290
617ba13b 5291static int ext4_write_info(struct super_block *sb, int type)
ac27a0ec
DK		 5292{
5293 int ret, err;
5294 handle_t *handle;
5295
5296 /* Data block + inode block */
2b0143b5 5297 handle = ext4_journal_start(d_inode(sb->s_root), EXT4_HT_QUOTA, 2);
ac27a0ec
DK		 5298 if (IS_ERR(handle))
5299 return PTR_ERR(handle);
5300 ret = dquot_commit_info(sb, type);
617ba13b 5301 err = ext4_journal_stop(handle);
ac27a0ec
DK		 5302 if (!ret)
5303 ret = err;
5304 return ret;
5305}
5306
5307/*
5308 * Turn on quotas during mount time - we need to find
5309 * the quota file and such...
5310 */
617ba13b 5311static int ext4_quota_on_mount(struct super_block *sb, int type)
ac27a0ec 5312{
287a8095
CH		 5313 return dquot_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
5314 EXT4_SB(sb)->s_jquota_fmt, type);
ac27a0ec
DK		 5315}
5316
daf647d2
TT		 5317static void lockdep_set_quota_inode(struct inode *inode, int subclass)
5318{
5319 struct ext4_inode_info *ei = EXT4_I(inode);
5320
5321 /* The first argument of lockdep_set_subclass has to be
5322 * *exactly* the same as the argument to init_rwsem() --- in
5323 * this case, in init_once() --- or lockdep gets unhappy
5324 * because the name of the lock is set using the
5325 * stringification of the argument to init_rwsem().
5326 */
5327 (void) ei; /* shut up clang warning if !CONFIG_LOCKDEP */
5328 lockdep_set_subclass(&ei->i_data_sem, subclass);
5329}
5330
ac27a0ec
DK		 5331/*
5332 * Standard function to be called on quota_on
5333 */
617ba13b 5334static int ext4_quota_on(struct super_block *sb, int type, int format_id,
8c54ca9c 5335 const struct path *path)
ac27a0ec
DK		 5336{
5337 int err;
ac27a0ec
DK		 5338
5339 if (!test_opt(sb, QUOTA))
5340 return -EINVAL;
0623543b 5341
ac27a0ec 5342 /* Quotafile not on the same filesystem? */
d8c9584e 5343 if (path->dentry->d_sb != sb)
ac27a0ec 5344 return -EXDEV;
0623543b
JK		 5345 /* Journaling quota? */
5346 if (EXT4_SB(sb)->s_qf_names[type]) {
2b2d6d01 5347 /* Quotafile not in fs root? */
f00c9e44 5348 if (path->dentry->d_parent != sb->s_root)
b31e1552
ES		 5349 ext4_msg(sb, KERN_WARNING,
5350 "Quota file not on filesystem root. "
5351 "Journaled quota will not work");
2b2d6d01 5352 }
0623543b
JK		 5353
5354 /*
5355 * When we journal data on quota file, we have to flush journal to see
5356 * all updates to the file when we bypass pagecache...
5357 */
0390131b 5358 if (EXT4_SB(sb)->s_journal &&
2b0143b5 5359 ext4_should_journal_data(d_inode(path->dentry))) {
0623543b
JK		 5360 /*
5361 * We don't need to lock updates but journal_flush() could
5362 * otherwise be livelocked...
5363 */
5364 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
7ffe1ea8 5365 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
0623543b 5366 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
f00c9e44 5367 if (err)
7ffe1ea8 5368 return err;
0623543b 5369 }
957153fc 5370
daf647d2
TT		 5371 lockdep_set_quota_inode(path->dentry->d_inode, I_DATA_SEM_QUOTA);
5372 err = dquot_quota_on(sb, type, format_id, path);
957153fc 5373 if (err) {
daf647d2
TT		 5374 lockdep_set_quota_inode(path->dentry->d_inode,
5375 I_DATA_SEM_NORMAL);
957153fc
JK		 5376 } else {
5377 struct inode *inode = d_inode(path->dentry);
5378 handle_t *handle;
5379
5380 inode_lock(inode);
5381 handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1);
5382 if (IS_ERR(handle))
5383 goto unlock_inode;
5384 EXT4_I(inode)->i_flags |= EXT4_NOATIME_FL | EXT4_IMMUTABLE_FL;
5385 inode_set_flags(inode, S_NOATIME | S_IMMUTABLE,
5386 S_NOATIME | S_IMMUTABLE);
5387 ext4_mark_inode_dirty(handle, inode);
5388 ext4_journal_stop(handle);
5389 unlock_inode:
5390 inode_unlock(inode);
5391 }
daf647d2 5392 return err;
ac27a0ec
DK		 5393}
5394
7c319d32
AK		 5395static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
5396 unsigned int flags)
5397{
5398 int err;
5399 struct inode *qf_inode;
a2d4a646 5400 unsigned long qf_inums[EXT4_MAXQUOTAS] = {
7c319d32 5401 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
689c958c
LX		 5402 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum),
5403 le32_to_cpu(EXT4_SB(sb)->s_es->s_prj_quota_inum)
7c319d32
AK		 5404 };
5405
e2b911c5 5406 BUG_ON(!ext4_has_feature_quota(sb));
7c319d32
AK		 5407
5408 if (!qf_inums[type])
5409 return -EPERM;
5410
5411 qf_inode = ext4_iget(sb, qf_inums[type]);
5412 if (IS_ERR(qf_inode)) {
5413 ext4_error(sb, "Bad quota inode # %lu", qf_inums[type]);
5414 return PTR_ERR(qf_inode);
5415 }
5416
bcb13850
JK		 5417 /* Don't account quota for quota files to avoid recursion */
5418 qf_inode->i_flags |= S_NOQUOTA;
daf647d2 5419 lockdep_set_quota_inode(qf_inode, I_DATA_SEM_QUOTA);
7c319d32
AK		 5420 err = dquot_enable(qf_inode, type, format_id, flags);
5421 iput(qf_inode);
daf647d2
TT		 5422 if (err)
5423 lockdep_set_quota_inode(qf_inode, I_DATA_SEM_NORMAL);
7c319d32
AK		 5424
5425 return err;
5426}
5427
5428/* Enable usage tracking for all quota types. */
5429static int ext4_enable_quotas(struct super_block *sb)
5430{
5431 int type, err = 0;
a2d4a646 5432 unsigned long qf_inums[EXT4_MAXQUOTAS] = {
7c319d32 5433 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
689c958c
LX		 5434 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum),
5435 le32_to_cpu(EXT4_SB(sb)->s_es->s_prj_quota_inum)
7c319d32 5436 };
49da9392
JK		 5437 bool quota_mopt[EXT4_MAXQUOTAS] = {
5438 test_opt(sb, USRQUOTA),
5439 test_opt(sb, GRPQUOTA),
5440 test_opt(sb, PRJQUOTA),
5441 };
7c319d32
AK		 5442
5443 sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE;
a2d4a646 5444 for (type = 0; type < EXT4_MAXQUOTAS; type++) {
7c319d32
AK		 5445 if (qf_inums[type]) {
5446 err = ext4_quota_enable(sb, type, QFMT_VFS_V1,
49da9392
JK		 5447 DQUOT_USAGE_ENABLED |
5448 (quota_mopt[type] ? DQUOT_LIMITS_ENABLED : 0));
7c319d32
AK		 5449 if (err) {
5450 ext4_warning(sb,
72ba7450
TT		 5451 "Failed to enable quota tracking "
5452 "(type=%d, err=%d). Please run "
5453 "e2fsck to fix.", type, err);
7c319d32
AK		 5454 return err;
5455 }
5456 }
5457 }
5458 return 0;
5459}
5460
ca0e05e4
DM		 5461static int ext4_quota_off(struct super_block *sb, int type)
5462{
21f97697
JK		 5463 struct inode *inode = sb_dqopt(sb)->files[type];
5464 handle_t *handle;
957153fc 5465 int err;
21f97697 5466
87009d86
DM		 5467 /* Force all delayed allocation blocks to be allocated.
5468 * Caller already holds s_umount sem */
5469 if (test_opt(sb, DELALLOC))
ca0e05e4 5470 sync_filesystem(sb);
ca0e05e4 5471
957153fc 5472 if (!inode || !igrab(inode))
0b268590
AG		 5473 goto out;
5474
957153fc
JK		 5475 err = dquot_quota_off(sb, type);
5476 if (err)
5477 goto out_put;
5478
5479 inode_lock(inode);
21f97697
JK		 5480 /* Update modification times of quota files when userspace can
5481 * start looking at them */
9924a92a 5482 handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1);
21f97697 5483 if (IS_ERR(handle))
957153fc
JK		 5484 goto out_unlock;
5485 EXT4_I(inode)->i_flags &= ~(EXT4_NOATIME_FL | EXT4_IMMUTABLE_FL);
5486 inode_set_flags(inode, 0, S_NOATIME | S_IMMUTABLE);
eeca7ea1 5487 inode->i_mtime = inode->i_ctime = current_time(inode);
21f97697
JK		 5488 ext4_mark_inode_dirty(handle, inode);
5489 ext4_journal_stop(handle);
957153fc
JK		 5490out_unlock:
5491 inode_unlock(inode);
5492out_put:
5493 iput(inode);
5494 return err;
21f97697 5495out:
ca0e05e4
DM		 5496 return dquot_quota_off(sb, type);
5497}
5498
ac27a0ec
DK		 5499/* Read data from quotafile - avoid pagecache and such because we cannot afford
5500 * acquiring the locks... As quota files are never truncated and quota code
25985edc 5501 * itself serializes the operations (and no one else should touch the files)
ac27a0ec 5502 * we don't have to be afraid of races */
617ba13b 5503static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec
DK		 5504 size_t len, loff_t off)
5505{
5506 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 5507 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 5508 int offset = off & (sb->s_blocksize - 1);
5509 int tocopy;
5510 size_t toread;
5511 struct buffer_head *bh;
5512 loff_t i_size = i_size_read(inode);
5513
5514 if (off > i_size)
5515 return 0;
5516 if (off+len > i_size)
5517 len = i_size-off;
5518 toread = len;
5519 while (toread > 0) {
5520 tocopy = sb->s_blocksize - offset < toread ?
5521 sb->s_blocksize - offset : toread;
1c215028
TT		 5522 bh = ext4_bread(NULL, inode, blk, 0);
5523 if (IS_ERR(bh))
5524 return PTR_ERR(bh);
ac27a0ec
DK		 5525 if (!bh) /* A hole? */
5526 memset(data, 0, tocopy);
5527 else
5528 memcpy(data, bh->b_data+offset, tocopy);
5529 brelse(bh);
5530 offset = 0;
5531 toread -= tocopy;
5532 data += tocopy;
5533 blk++;
5534 }
5535 return len;
5536}
5537
5538/* Write to quotafile (we know the transaction is already started and has
5539 * enough credits) */
617ba13b 5540static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec
DK		 5541 const char *data, size_t len, loff_t off)
5542{
5543 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 5544 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
1c215028 5545 int err, offset = off & (sb->s_blocksize - 1);
c5e298ae 5546 int retries = 0;
ac27a0ec
DK		 5547 struct buffer_head *bh;
5548 handle_t *handle = journal_current_handle();
5549
0390131b 5550 if (EXT4_SB(sb)->s_journal && !handle) {
b31e1552
ES		 5551 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
5552 " cancelled because transaction is not started",
9c3013e9
JK		 5553 (unsigned long long)off, (unsigned long long)len);
5554 return -EIO;
5555 }
67eeb568
DM		 5556 /*
5557 * Since we account only one data block in transaction credits,
5558 * then it is impossible to cross a block boundary.
5559 */
5560 if (sb->s_blocksize - offset < len) {
5561 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
5562 " cancelled because not block aligned",
5563 (unsigned long long)off, (unsigned long long)len);
5564 return -EIO;
5565 }
5566
c5e298ae
TT		 5567 do {
5568 bh = ext4_bread(handle, inode, blk,
5569 EXT4_GET_BLOCKS_CREATE |
5570 EXT4_GET_BLOCKS_METADATA_NOFAIL);
5571 } while (IS_ERR(bh) && (PTR_ERR(bh) == -ENOSPC) &&
5572 ext4_should_retry_alloc(inode->i_sb, &retries));
1c215028
TT		 5573 if (IS_ERR(bh))
5574 return PTR_ERR(bh);
67eeb568
DM		 5575 if (!bh)
5576 goto out;
5d601255 5577 BUFFER_TRACE(bh, "get write access");
62d2b5f2
JK		 5578 err = ext4_journal_get_write_access(handle, bh);
5579 if (err) {
5580 brelse(bh);
1c215028 5581 return err;
ac27a0ec 5582 }
67eeb568
DM		 5583 lock_buffer(bh);
5584 memcpy(bh->b_data+offset, data, len);
5585 flush_dcache_page(bh->b_page);
5586 unlock_buffer(bh);
62d2b5f2 5587 err = ext4_handle_dirty_metadata(handle, NULL, bh);
67eeb568 5588 brelse(bh);
ac27a0ec 5589out:
67eeb568
DM		 5590 if (inode->i_size < off + len) {
5591 i_size_write(inode, off + len);
617ba13b 5592 EXT4_I(inode)->i_disksize = inode->i_size;
21f97697 5593 ext4_mark_inode_dirty(handle, inode);
ac27a0ec 5594 }
67eeb568 5595 return len;
ac27a0ec
DK		 5596}
5597
8f0e8746
TT		 5598static int ext4_get_next_id(struct super_block *sb, struct kqid *qid)
5599{
5600 const struct quota_format_ops *ops;
5601
5602 if (!sb_has_quota_loaded(sb, qid->type))
5603 return -ESRCH;
5604 ops = sb_dqopt(sb)->ops[qid->type];
5605 if (!ops || !ops->get_next_id)
5606 return -ENOSYS;
5607 return dquot_get_next_id(sb, qid);
5608}
ac27a0ec
DK		 5609#endif
5610
152a0836
AV		 5611static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
5612 const char *dev_name, void *data)
ac27a0ec 5613{
152a0836 5614 return mount_bdev(fs_type, flags, dev_name, data, ext4_fill_super);
ac27a0ec
DK		 5615}
5616
c290ea01 5617#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2)
24b58424
TT		 5618static inline void register_as_ext2(void)
5619{
5620 int err = register_filesystem(&ext2_fs_type);
5621 if (err)
5622 printk(KERN_WARNING
5623 "EXT4-fs: Unable to register as ext2 (%d)\n", err);
5624}
5625
5626static inline void unregister_as_ext2(void)
5627{
5628 unregister_filesystem(&ext2_fs_type);
5629}
2035e776
TT		 5630
5631static inline int ext2_feature_set_ok(struct super_block *sb)
5632{
e2b911c5 5633 if (ext4_has_unknown_ext2_incompat_features(sb))
2035e776
TT		 5634 return 0;
5635 if (sb->s_flags & MS_RDONLY)
5636 return 1;
e2b911c5 5637 if (ext4_has_unknown_ext2_ro_compat_features(sb))
2035e776
TT		 5638 return 0;
5639 return 1;
5640}
24b58424
TT		 5641#else
5642static inline void register_as_ext2(void) { }
5643static inline void unregister_as_ext2(void) { }
2035e776 5644static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; }
24b58424
TT		 5645#endif
5646
24b58424
TT		 5647static inline void register_as_ext3(void)
5648{
5649 int err = register_filesystem(&ext3_fs_type);
5650 if (err)
5651 printk(KERN_WARNING
5652 "EXT4-fs: Unable to register as ext3 (%d)\n", err);
5653}
5654
5655static inline void unregister_as_ext3(void)
5656{
5657 unregister_filesystem(&ext3_fs_type);
5658}
2035e776
TT		 5659
5660static inline int ext3_feature_set_ok(struct super_block *sb)
5661{
e2b911c5 5662 if (ext4_has_unknown_ext3_incompat_features(sb))
2035e776 5663 return 0;
e2b911c5 5664 if (!ext4_has_feature_journal(sb))
2035e776
TT		 5665 return 0;
5666 if (sb->s_flags & MS_RDONLY)
5667 return 1;
e2b911c5 5668 if (ext4_has_unknown_ext3_ro_compat_features(sb))
2035e776
TT		 5669 return 0;
5670 return 1;
5671}
24b58424 5672
03010a33
TT		 5673static struct file_system_type ext4_fs_type = {
5674 .owner = THIS_MODULE,
5675 .name = "ext4",
152a0836 5676 .mount = ext4_mount,
03010a33
TT		 5677 .kill_sb = kill_block_super,
5678 .fs_flags = FS_REQUIRES_DEV,
5679};
7f78e035 5680MODULE_ALIAS_FS("ext4");
03010a33 5681
e9e3bcec
ES		 5682/* Shared across all ext4 file systems */
5683wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
e9e3bcec 5684
5dabfc78 5685static int __init ext4_init_fs(void)
ac27a0ec 5686{
e9e3bcec 5687 int i, err;
c9de560d 5688
e294a537 5689 ratelimit_state_init(&ext4_mount_msg_ratelimit, 30 * HZ, 64);
07c0c5d8
AV		 5690 ext4_li_info = NULL;
5691 mutex_init(&ext4_li_mtx);
5692
9a4c8019 5693 /* Build-time check for flags consistency */
12e9b892 5694 ext4_check_flag_values();
e9e3bcec 5695
e142d052 5696 for (i = 0; i < EXT4_WQ_HASH_SZ; i++)
e9e3bcec 5697 init_waitqueue_head(&ext4__ioend_wq[i]);
e9e3bcec 5698
51865fda 5699 err = ext4_init_es();
6fd058f7
TT		 5700 if (err)
5701 return err;
51865fda
ZL		 5702
5703 err = ext4_init_pageio();
5704 if (err)
b5799018 5705 goto out5;
51865fda 5706
5dabfc78 5707 err = ext4_init_system_zone();
bd2d0210 5708 if (err)
b5799018 5709 goto out4;
857ac889 5710
b5799018 5711 err = ext4_init_sysfs();
dd68314c 5712 if (err)
b5799018 5713 goto out3;
857ac889 5714
5dabfc78 5715 err = ext4_init_mballoc();
c9de560d
AT		 5716 if (err)
5717 goto out2;
ac27a0ec
DK		 5718 err = init_inodecache();
5719 if (err)
5720 goto out1;
24b58424 5721 register_as_ext3();
2035e776 5722 register_as_ext2();
03010a33 5723 err = register_filesystem(&ext4_fs_type);
ac27a0ec
DK		 5724 if (err)
5725 goto out;
bfff6873 5726
ac27a0ec
DK		 5727 return 0;
5728out:
24b58424
TT		 5729 unregister_as_ext2();
5730 unregister_as_ext3();
ac27a0ec
DK		 5731 destroy_inodecache();
5732out1:
5dabfc78 5733 ext4_exit_mballoc();
9c191f70 5734out2:
b5799018
TT		 5735 ext4_exit_sysfs();
5736out3:
5dabfc78 5737 ext4_exit_system_zone();
b5799018 5738out4:
5dabfc78 5739 ext4_exit_pageio();
b5799018 5740out5:
51865fda
ZL		 5741 ext4_exit_es();
5742
ac27a0ec
DK		 5743 return err;
5744}
5745
5dabfc78 5746static void __exit ext4_exit_fs(void)
ac27a0ec 5747{
bfff6873 5748 ext4_destroy_lazyinit_thread();
24b58424
TT		 5749 unregister_as_ext2();
5750 unregister_as_ext3();
03010a33 5751 unregister_filesystem(&ext4_fs_type);
ac27a0ec 5752 destroy_inodecache();
5dabfc78 5753 ext4_exit_mballoc();
b5799018 5754 ext4_exit_sysfs();
5dabfc78
TT		 5755 ext4_exit_system_zone();
5756 ext4_exit_pageio();
dd12ed14 5757 ext4_exit_es();
ac27a0ec
DK		 5758}
5759
5760MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
83982b6f 5761MODULE_DESCRIPTION("Fourth Extended Filesystem");
ac27a0ec 5762MODULE_LICENSE("GPL");
5dabfc78
TT		 5763module_init(ext4_init_fs)
5764module_exit(ext4_exit_fs)
Empty description
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