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Merge git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending
[linux.git] / fs / ext4 / super.c
CommitLineData
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>
27#include <linux/parser.h>
ac27a0ec 28#include <linux/buffer_head.h>
a5694255 29#include <linux/exportfs.h>
ac27a0ec
DK		 30#include <linux/vfs.h>
31#include <linux/random.h>
32#include <linux/mount.h>
33#include <linux/namei.h>
34#include <linux/quotaops.h>
35#include <linux/seq_file.h>
9f6200bb 36#include <linux/proc_fs.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>
ac27a0ec
DK		 41#include <asm/uaccess.h>
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
1f109d5a 56static struct proc_dir_entry *ext4_proc_root;
3197ebdb 57static struct kset *ext4_kset;
0b75a840
LC		 58static struct ext4_lazy_init *ext4_li_info;
59static struct mutex ext4_li_mtx;
60static struct ext4_features *ext4_feat;
9c191f70 61static int ext4_mballoc_ready;
9f6200bb 62
617ba13b 63static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
ac27a0ec 64 unsigned long journal_devnum);
2adf6da8 65static int ext4_show_options(struct seq_file *seq, struct dentry *root);
e2d67052 66static int ext4_commit_super(struct super_block *sb, int sync);
2b2d6d01
TT		 67static void ext4_mark_recovery_complete(struct super_block *sb,
68 struct ext4_super_block *es);
69static void ext4_clear_journal_err(struct super_block *sb,
70 struct ext4_super_block *es);
617ba13b 71static int ext4_sync_fs(struct super_block *sb, int wait);
2b2d6d01
TT		 72static int ext4_remount(struct super_block *sb, int *flags, char *data);
73static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
c4be0c1d 74static int ext4_unfreeze(struct super_block *sb);
c4be0c1d 75static int ext4_freeze(struct super_block *sb);
152a0836
AV		 76static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
77 const char *dev_name, void *data);
2035e776
TT		 78static inline int ext2_feature_set_ok(struct super_block *sb);
79static inline int ext3_feature_set_ok(struct super_block *sb);
d39195c3 80static int ext4_feature_set_ok(struct super_block *sb, int readonly);
bfff6873
LC		 81static void ext4_destroy_lazyinit_thread(void);
82static void ext4_unregister_li_request(struct super_block *sb);
8f1f7453 83static void ext4_clear_request_list(void);
27dd4385 84static int ext4_reserve_clusters(struct ext4_sb_info *, ext4_fsblk_t);
ac27a0ec 85
2035e776
TT		 86#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
87static struct file_system_type ext2_fs_type = {
88 .owner = THIS_MODULE,
89 .name = "ext2",
90 .mount = ext4_mount,
91 .kill_sb = kill_block_super,
92 .fs_flags = FS_REQUIRES_DEV,
93};
7f78e035 94MODULE_ALIAS_FS("ext2");
fa7614dd 95MODULE_ALIAS("ext2");
2035e776
TT		 96#define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type)
97#else
98#define IS_EXT2_SB(sb) (0)
99#endif
100
101
ba69f9ab
JK		 102#if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
103static struct file_system_type ext3_fs_type = {
104 .owner = THIS_MODULE,
105 .name = "ext3",
152a0836 106 .mount = ext4_mount,
ba69f9ab
JK		 107 .kill_sb = kill_block_super,
108 .fs_flags = FS_REQUIRES_DEV,
109};
7f78e035 110MODULE_ALIAS_FS("ext3");
fa7614dd 111MODULE_ALIAS("ext3");
ba69f9ab
JK		 112#define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type)
113#else
114#define IS_EXT3_SB(sb) (0)
115#endif
bd81d8ee 116
d25425f8
DW		 117static int ext4_verify_csum_type(struct super_block *sb,
118 struct ext4_super_block *es)
119{
120 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
121 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
122 return 1;
123
124 return es->s_checksum_type == EXT4_CRC32C_CHKSUM;
125}
126
a9c47317
DW		 127static __le32 ext4_superblock_csum(struct super_block *sb,
128 struct ext4_super_block *es)
129{
130 struct ext4_sb_info *sbi = EXT4_SB(sb);
131 int offset = offsetof(struct ext4_super_block, s_checksum);
132 __u32 csum;
133
134 csum = ext4_chksum(sbi, ~0, (char *)es, offset);
135
136 return cpu_to_le32(csum);
137}
138
c197855e
SH		 139static int ext4_superblock_csum_verify(struct super_block *sb,
140 struct ext4_super_block *es)
a9c47317 141{
9aa5d32b 142 if (!ext4_has_metadata_csum(sb))
a9c47317
DW		 143 return 1;
144
145 return es->s_checksum == ext4_superblock_csum(sb, es);
146}
147
06db49e6 148void ext4_superblock_csum_set(struct super_block *sb)
a9c47317 149{
06db49e6
TT		 150 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
151
9aa5d32b 152 if (!ext4_has_metadata_csum(sb))
a9c47317
DW		 153 return;
154
155 es->s_checksum = ext4_superblock_csum(sb, es);
156}
157
9933fc0a
TT		 158void *ext4_kvmalloc(size_t size, gfp_t flags)
159{
160 void *ret;
161
8be04b93 162 ret = kmalloc(size, flags | __GFP_NOWARN);
9933fc0a
TT		 163 if (!ret)
164 ret = __vmalloc(size, flags, PAGE_KERNEL);
165 return ret;
166}
167
168void *ext4_kvzalloc(size_t size, gfp_t flags)
169{
170 void *ret;
171
8be04b93 172 ret = kzalloc(size, flags | __GFP_NOWARN);
9933fc0a
TT		 173 if (!ret)
174 ret = __vmalloc(size, flags | __GFP_ZERO, PAGE_KERNEL);
175 return ret;
176}
177
8fadc143
AR		 178ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
179 struct ext4_group_desc *bg)
bd81d8ee 180{
3a14589c 181 return le32_to_cpu(bg->bg_block_bitmap_lo) |
8fadc143 182 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 183 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 184}
185
8fadc143
AR		 186ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
187 struct ext4_group_desc *bg)
bd81d8ee 188{
5272f837 189 return le32_to_cpu(bg->bg_inode_bitmap_lo) |
8fadc143 190 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 191 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 192}
193
8fadc143
AR		 194ext4_fsblk_t ext4_inode_table(struct super_block *sb,
195 struct ext4_group_desc *bg)
bd81d8ee 196{
5272f837 197 return le32_to_cpu(bg->bg_inode_table_lo) |
8fadc143 198 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 199 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
bd81d8ee
LV		 200}
201
021b65bb
TT		 202__u32 ext4_free_group_clusters(struct super_block *sb,
203 struct ext4_group_desc *bg)
560671a0
AK		 204{
205 return le16_to_cpu(bg->bg_free_blocks_count_lo) |
206 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 207 (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0);
560671a0
AK		 208}
209
210__u32 ext4_free_inodes_count(struct super_block *sb,
211 struct ext4_group_desc *bg)
212{
213 return le16_to_cpu(bg->bg_free_inodes_count_lo) |
214 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 215 (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0);
560671a0
AK		 216}
217
218__u32 ext4_used_dirs_count(struct super_block *sb,
219 struct ext4_group_desc *bg)
220{
221 return le16_to_cpu(bg->bg_used_dirs_count_lo) |
222 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 223 (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0);
560671a0
AK		 224}
225
226__u32 ext4_itable_unused_count(struct super_block *sb,
227 struct ext4_group_desc *bg)
228{
229 return le16_to_cpu(bg->bg_itable_unused_lo) |
230 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 231 (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0);
560671a0
AK		 232}
233
8fadc143
AR		 234void ext4_block_bitmap_set(struct super_block *sb,
235 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 236{
3a14589c 237 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 238 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
239 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 240}
241
8fadc143
AR		 242void ext4_inode_bitmap_set(struct super_block *sb,
243 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 244{
5272f837 245 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 246 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
247 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 248}
249
8fadc143
AR		 250void ext4_inode_table_set(struct super_block *sb,
251 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 252{
5272f837 253 bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 254 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
255 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 256}
257
021b65bb
TT		 258void ext4_free_group_clusters_set(struct super_block *sb,
259 struct ext4_group_desc *bg, __u32 count)
560671a0
AK		 260{
261 bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count);
262 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
263 bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16);
264}
265
266void ext4_free_inodes_set(struct super_block *sb,
267 struct ext4_group_desc *bg, __u32 count)
268{
269 bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count);
270 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
271 bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16);
272}
273
274void ext4_used_dirs_set(struct super_block *sb,
275 struct ext4_group_desc *bg, __u32 count)
276{
277 bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count);
278 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
279 bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16);
280}
281
282void ext4_itable_unused_set(struct super_block *sb,
283 struct ext4_group_desc *bg, __u32 count)
284{
285 bg->bg_itable_unused_lo = cpu_to_le16((__u16)count);
286 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
287 bg->bg_itable_unused_hi = cpu_to_le16(count >> 16);
288}
289
d3d1faf6 290
1c13d5c0
TT		 291static void __save_error_info(struct super_block *sb, const char *func,
292 unsigned int line)
293{
294 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
295
296 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
1b46617b
TT		 297 if (bdev_read_only(sb->s_bdev))
298 return;
1c13d5c0
TT		 299 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
300 es->s_last_error_time = cpu_to_le32(get_seconds());
301 strncpy(es->s_last_error_func, func, sizeof(es->s_last_error_func));
302 es->s_last_error_line = cpu_to_le32(line);
303 if (!es->s_first_error_time) {
304 es->s_first_error_time = es->s_last_error_time;
305 strncpy(es->s_first_error_func, func,
306 sizeof(es->s_first_error_func));
307 es->s_first_error_line = cpu_to_le32(line);
308 es->s_first_error_ino = es->s_last_error_ino;
309 es->s_first_error_block = es->s_last_error_block;
310 }
66e61a9e
TT		 311 /*
312 * Start the daily error reporting function if it hasn't been
313 * started already
314 */
315 if (!es->s_error_count)
316 mod_timer(&EXT4_SB(sb)->s_err_report, jiffies + 24*60*60*HZ);
ba39ebb6 317 le32_add_cpu(&es->s_error_count, 1);
1c13d5c0
TT		 318}
319
320static void save_error_info(struct super_block *sb, const char *func,
321 unsigned int line)
322{
323 __save_error_info(sb, func, line);
324 ext4_commit_super(sb, 1);
325}
326
18aadd47
BJ		 327static void ext4_journal_commit_callback(journal_t *journal, transaction_t *txn)
328{
329 struct super_block *sb = journal->j_private;
330 struct ext4_sb_info *sbi = EXT4_SB(sb);
331 int error = is_journal_aborted(journal);
5d3ee208 332 struct ext4_journal_cb_entry *jce;
18aadd47 333
5d3ee208 334 BUG_ON(txn->t_state == T_FINISHED);
18aadd47 335 spin_lock(&sbi->s_md_lock);
5d3ee208
DM		 336 while (!list_empty(&txn->t_private_list)) {
337 jce = list_entry(txn->t_private_list.next,
338 struct ext4_journal_cb_entry, jce_list);
18aadd47
BJ		 339 list_del_init(&jce->jce_list);
340 spin_unlock(&sbi->s_md_lock);
341 jce->jce_func(sb, jce, error);
342 spin_lock(&sbi->s_md_lock);
343 }
344 spin_unlock(&sbi->s_md_lock);
345}
1c13d5c0 346
ac27a0ec
DK		 347/* Deal with the reporting of failure conditions on a filesystem such as
348 * inconsistencies detected or read IO failures.
349 *
350 * On ext2, we can store the error state of the filesystem in the
617ba13b 351 * superblock. That is not possible on ext4, because we may have other
ac27a0ec
DK		 352 * write ordering constraints on the superblock which prevent us from
353 * writing it out straight away; and given that the journal is about to
354 * be aborted, we can't rely on the current, or future, transactions to
355 * write out the superblock safely.
356 *
dab291af 357 * We'll just use the jbd2_journal_abort() error code to record an error in
d6b198bc 358 * the journal instead. On recovery, the journal will complain about
ac27a0ec
DK		 359 * that error until we've noted it down and cleared it.
360 */
361
617ba13b 362static void ext4_handle_error(struct super_block *sb)
ac27a0ec 363{
ac27a0ec
DK		 364 if (sb->s_flags & MS_RDONLY)
365 return;
366
2b2d6d01 367 if (!test_opt(sb, ERRORS_CONT)) {
617ba13b 368 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 369
4ab2f15b 370 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
ac27a0ec 371 if (journal)
dab291af 372 jbd2_journal_abort(journal, -EIO);
ac27a0ec 373 }
2b2d6d01 374 if (test_opt(sb, ERRORS_RO)) {
b31e1552 375 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
4418e141
DM		 376 /*
377 * Make sure updated value of ->s_mount_flags will be visible
378 * before ->s_flags update
379 */
380 smp_wmb();
ac27a0ec
DK		 381 sb->s_flags |= MS_RDONLY;
382 }
ac27a0ec 383 if (test_opt(sb, ERRORS_PANIC))
617ba13b 384 panic("EXT4-fs (device %s): panic forced after error\n",
ac27a0ec
DK		 385 sb->s_id);
386}
387
efbed4dc
TT		 388#define ext4_error_ratelimit(sb) \
389 ___ratelimit(&(EXT4_SB(sb)->s_err_ratelimit_state), \
390 "EXT4-fs error")
391
12062ddd 392void __ext4_error(struct super_block *sb, const char *function,
c398eda0 393 unsigned int line, const char *fmt, ...)
ac27a0ec 394{
0ff2ea7d 395 struct va_format vaf;
ac27a0ec
DK		 396 va_list args;
397
efbed4dc
TT		 398 if (ext4_error_ratelimit(sb)) {
399 va_start(args, fmt);
400 vaf.fmt = fmt;
401 vaf.va = &args;
402 printk(KERN_CRIT
403 "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n",
404 sb->s_id, function, line, current->comm, &vaf);
405 va_end(args);
406 }
f3fc0210 407 save_error_info(sb, function, line);
617ba13b 408 ext4_handle_error(sb);
ac27a0ec
DK		 409}
410
e7c96e8e
JP		 411void __ext4_error_inode(struct inode *inode, const char *function,
412 unsigned int line, ext4_fsblk_t block,
413 const char *fmt, ...)
273df556
FM		 414{
415 va_list args;
f7c21177 416 struct va_format vaf;
1c13d5c0 417 struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
273df556 418
1c13d5c0
TT		 419 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
420 es->s_last_error_block = cpu_to_le64(block);
efbed4dc
TT		 421 if (ext4_error_ratelimit(inode->i_sb)) {
422 va_start(args, fmt);
423 vaf.fmt = fmt;
424 vaf.va = &args;
425 if (block)
426 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
427 "inode #%lu: block %llu: comm %s: %pV\n",
428 inode->i_sb->s_id, function, line, inode->i_ino,
429 block, current->comm, &vaf);
430 else
431 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
432 "inode #%lu: comm %s: %pV\n",
433 inode->i_sb->s_id, function, line, inode->i_ino,
434 current->comm, &vaf);
435 va_end(args);
436 }
1c13d5c0 437 save_error_info(inode->i_sb, function, line);
273df556
FM		 438 ext4_handle_error(inode->i_sb);
439}
440
e7c96e8e
JP		 441void __ext4_error_file(struct file *file, const char *function,
442 unsigned int line, ext4_fsblk_t block,
443 const char *fmt, ...)
273df556
FM		 444{
445 va_list args;
f7c21177 446 struct va_format vaf;
1c13d5c0 447 struct ext4_super_block *es;
496ad9aa 448 struct inode *inode = file_inode(file);
273df556
FM		 449 char pathname[80], *path;
450
1c13d5c0
TT		 451 es = EXT4_SB(inode->i_sb)->s_es;
452 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
efbed4dc
TT		 453 if (ext4_error_ratelimit(inode->i_sb)) {
454 path = d_path(&(file->f_path), pathname, sizeof(pathname));
455 if (IS_ERR(path))
456 path = "(unknown)";
457 va_start(args, fmt);
458 vaf.fmt = fmt;
459 vaf.va = &args;
460 if (block)
461 printk(KERN_CRIT
462 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
463 "block %llu: comm %s: path %s: %pV\n",
464 inode->i_sb->s_id, function, line, inode->i_ino,
465 block, current->comm, path, &vaf);
466 else
467 printk(KERN_CRIT
468 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
469 "comm %s: path %s: %pV\n",
470 inode->i_sb->s_id, function, line, inode->i_ino,
471 current->comm, path, &vaf);
472 va_end(args);
473 }
1c13d5c0 474 save_error_info(inode->i_sb, function, line);
273df556
FM		 475 ext4_handle_error(inode->i_sb);
476}
477
722887dd
TT		 478const char *ext4_decode_error(struct super_block *sb, int errno,
479 char nbuf[16])
ac27a0ec
DK		 480{
481 char *errstr = NULL;
482
483 switch (errno) {
484 case -EIO:
485 errstr = "IO failure";
486 break;
487 case -ENOMEM:
488 errstr = "Out of memory";
489 break;
490 case -EROFS:
78f1ddbb
TT		 491 if (!sb || (EXT4_SB(sb)->s_journal &&
492 EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT))
ac27a0ec
DK		 493 errstr = "Journal has aborted";
494 else
495 errstr = "Readonly filesystem";
496 break;
497 default:
498 /* If the caller passed in an extra buffer for unknown
499 * errors, textualise them now. Else we just return
500 * NULL. */
501 if (nbuf) {
502 /* Check for truncated error codes... */
503 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
504 errstr = nbuf;
505 }
506 break;
507 }
508
509 return errstr;
510}
511
617ba13b 512/* __ext4_std_error decodes expected errors from journaling functions
ac27a0ec
DK		 513 * automatically and invokes the appropriate error response. */
514
c398eda0
TT		 515void __ext4_std_error(struct super_block *sb, const char *function,
516 unsigned int line, int errno)
ac27a0ec
DK		 517{
518 char nbuf[16];
519 const char *errstr;
520
521 /* Special case: if the error is EROFS, and we're not already
522 * inside a transaction, then there's really no point in logging
523 * an error. */
524 if (errno == -EROFS && journal_current_handle() == NULL &&
525 (sb->s_flags & MS_RDONLY))
526 return;
527
efbed4dc
TT		 528 if (ext4_error_ratelimit(sb)) {
529 errstr = ext4_decode_error(sb, errno, nbuf);
530 printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n",
531 sb->s_id, function, line, errstr);
532 }
ac27a0ec 533
efbed4dc 534 save_error_info(sb, function, line);
617ba13b 535 ext4_handle_error(sb);
ac27a0ec
DK		 536}
537
538/*
617ba13b 539 * ext4_abort is a much stronger failure handler than ext4_error. The
ac27a0ec
DK		 540 * abort function may be used to deal with unrecoverable failures such
541 * as journal IO errors or ENOMEM at a critical moment in log management.
542 *
543 * We unconditionally force the filesystem into an ABORT|READONLY state,
544 * unless the error response on the fs has been set to panic in which
545 * case we take the easy way out and panic immediately.
546 */
547
c67d859e 548void __ext4_abort(struct super_block *sb, const char *function,
c398eda0 549 unsigned int line, const char *fmt, ...)
ac27a0ec
DK		 550{
551 va_list args;
552
1c13d5c0 553 save_error_info(sb, function, line);
ac27a0ec 554 va_start(args, fmt);
c398eda0
TT		 555 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: ", sb->s_id,
556 function, line);
ac27a0ec
DK		 557 vprintk(fmt, args);
558 printk("\n");
559 va_end(args);
560
1c13d5c0
TT		 561 if ((sb->s_flags & MS_RDONLY) == 0) {
562 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
1c13d5c0 563 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
4418e141
DM		 564 /*
565 * Make sure updated value of ->s_mount_flags will be visible
566 * before ->s_flags update
567 */
568 smp_wmb();
569 sb->s_flags |= MS_RDONLY;
1c13d5c0
TT		 570 if (EXT4_SB(sb)->s_journal)
571 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
572 save_error_info(sb, function, line);
573 }
ac27a0ec 574 if (test_opt(sb, ERRORS_PANIC))
617ba13b 575 panic("EXT4-fs panic from previous error\n");
ac27a0ec
DK		 576}
577
e7c96e8e
JP		 578void __ext4_msg(struct super_block *sb,
579 const char *prefix, const char *fmt, ...)
b31e1552 580{
0ff2ea7d 581 struct va_format vaf;
b31e1552
ES		 582 va_list args;
583
efbed4dc
TT		 584 if (!___ratelimit(&(EXT4_SB(sb)->s_msg_ratelimit_state), "EXT4-fs"))
585 return;
586
b31e1552 587 va_start(args, fmt);
0ff2ea7d
JP		 588 vaf.fmt = fmt;
589 vaf.va = &args;
590 printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
b31e1552
ES		 591 va_end(args);
592}
593
12062ddd 594void __ext4_warning(struct super_block *sb, const char *function,
c398eda0 595 unsigned int line, const char *fmt, ...)
ac27a0ec 596{
0ff2ea7d 597 struct va_format vaf;
ac27a0ec
DK		 598 va_list args;
599
efbed4dc
TT		 600 if (!___ratelimit(&(EXT4_SB(sb)->s_warning_ratelimit_state),
601 "EXT4-fs warning"))
602 return;
603
ac27a0ec 604 va_start(args, fmt);
0ff2ea7d
JP		 605 vaf.fmt = fmt;
606 vaf.va = &args;
607 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: %pV\n",
608 sb->s_id, function, line, &vaf);
ac27a0ec
DK		 609 va_end(args);
610}
611
e29136f8
TT		 612void __ext4_grp_locked_error(const char *function, unsigned int line,
613 struct super_block *sb, ext4_group_t grp,
614 unsigned long ino, ext4_fsblk_t block,
615 const char *fmt, ...)
5d1b1b3f
AK		 616__releases(bitlock)
617__acquires(bitlock)
618{
0ff2ea7d 619 struct va_format vaf;
5d1b1b3f
AK		 620 va_list args;
621 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
622
1c13d5c0
TT		 623 es->s_last_error_ino = cpu_to_le32(ino);
624 es->s_last_error_block = cpu_to_le64(block);
625 __save_error_info(sb, function, line);
0ff2ea7d 626
efbed4dc
TT		 627 if (ext4_error_ratelimit(sb)) {
628 va_start(args, fmt);
629 vaf.fmt = fmt;
630 vaf.va = &args;
631 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u, ",
632 sb->s_id, function, line, grp);
633 if (ino)
634 printk(KERN_CONT "inode %lu: ", ino);
635 if (block)
636 printk(KERN_CONT "block %llu:",
637 (unsigned long long) block);
638 printk(KERN_CONT "%pV\n", &vaf);
639 va_end(args);
640 }
5d1b1b3f
AK		 641
642 if (test_opt(sb, ERRORS_CONT)) {
e2d67052 643 ext4_commit_super(sb, 0);
5d1b1b3f
AK		 644 return;
645 }
1c13d5c0 646
5d1b1b3f
AK		 647 ext4_unlock_group(sb, grp);
648 ext4_handle_error(sb);
649 /*
650 * We only get here in the ERRORS_RO case; relocking the group
651 * may be dangerous, but nothing bad will happen since the
652 * filesystem will have already been marked read/only and the
653 * journal has been aborted. We return 1 as a hint to callers
654 * who might what to use the return value from
25985edc 655 * ext4_grp_locked_error() to distinguish between the
5d1b1b3f
AK		 656 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
657 * aggressively from the ext4 function in question, with a
658 * more appropriate error code.
659 */
660 ext4_lock_group(sb, grp);
661 return;
662}
663
617ba13b 664void ext4_update_dynamic_rev(struct super_block *sb)
ac27a0ec 665{
617ba13b 666 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
ac27a0ec 667
617ba13b 668 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
ac27a0ec
DK		 669 return;
670
12062ddd 671 ext4_warning(sb,
ac27a0ec
DK		 672 "updating to rev %d because of new feature flag, "
673 "running e2fsck is recommended",
617ba13b 674 EXT4_DYNAMIC_REV);
ac27a0ec 675
617ba13b
MC		 676 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
677 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
678 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
ac27a0ec
DK		 679 /* leave es->s_feature_*compat flags alone */
680 /* es->s_uuid will be set by e2fsck if empty */
681
682 /*
683 * The rest of the superblock fields should be zero, and if not it
684 * means they are likely already in use, so leave them alone. We
685 * can leave it up to e2fsck to clean up any inconsistencies there.
686 */
687}
688
689/*
690 * Open the external journal device
691 */
b31e1552 692static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb)
ac27a0ec
DK		 693{
694 struct block_device *bdev;
695 char b[BDEVNAME_SIZE];
696
d4d77629 697 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
ac27a0ec
DK		 698 if (IS_ERR(bdev))
699 goto fail;
700 return bdev;
701
702fail:
b31e1552 703 ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld",
ac27a0ec
DK		 704 __bdevname(dev, b), PTR_ERR(bdev));
705 return NULL;
706}
707
708/*
709 * Release the journal device
710 */
4385bab1 711static void ext4_blkdev_put(struct block_device *bdev)
ac27a0ec 712{
4385bab1 713 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
ac27a0ec
DK		 714}
715
4385bab1 716static void ext4_blkdev_remove(struct ext4_sb_info *sbi)
ac27a0ec
DK		 717{
718 struct block_device *bdev;
ac27a0ec
DK		 719 bdev = sbi->journal_bdev;
720 if (bdev) {
4385bab1 721 ext4_blkdev_put(bdev);
ac27a0ec
DK		 722 sbi->journal_bdev = NULL;
723 }
ac27a0ec
DK		 724}
725
726static inline struct inode *orphan_list_entry(struct list_head *l)
727{
617ba13b 728 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
ac27a0ec
DK		 729}
730
617ba13b 731static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
ac27a0ec
DK		 732{
733 struct list_head *l;
734
b31e1552
ES		 735 ext4_msg(sb, KERN_ERR, "sb orphan head is %d",
736 le32_to_cpu(sbi->s_es->s_last_orphan));
ac27a0ec
DK		 737
738 printk(KERN_ERR "sb_info orphan list:\n");
739 list_for_each(l, &sbi->s_orphan) {
740 struct inode *inode = orphan_list_entry(l);
741 printk(KERN_ERR " "
742 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
743 inode->i_sb->s_id, inode->i_ino, inode,
744 inode->i_mode, inode->i_nlink,
745 NEXT_ORPHAN(inode));
746 }
747}
748
2b2d6d01 749static void ext4_put_super(struct super_block *sb)
ac27a0ec 750{
617ba13b
MC		 751 struct ext4_sb_info *sbi = EXT4_SB(sb);
752 struct ext4_super_block *es = sbi->s_es;
ef2cabf7 753 int i, err;
ac27a0ec 754
857ac889 755 ext4_unregister_li_request(sb);
e0ccfd95
CH		 756 dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
757
2e8fa54e 758 flush_workqueue(sbi->rsv_conversion_wq);
2e8fa54e 759 destroy_workqueue(sbi->rsv_conversion_wq);
4c0425ff 760
0390131b
FM		 761 if (sbi->s_journal) {
762 err = jbd2_journal_destroy(sbi->s_journal);
763 sbi->s_journal = NULL;
764 if (err < 0)
c67d859e 765 ext4_abort(sb, "Couldn't clean up the journal");
0390131b 766 }
d4edac31 767
d3922a77 768 ext4_es_unregister_shrinker(sbi);
9105bb14 769 del_timer_sync(&sbi->s_err_report);
d4edac31
JB		 770 ext4_release_system_zone(sb);
771 ext4_mb_release(sb);
772 ext4_ext_release(sb);
773 ext4_xattr_put_super(sb);
774
ac27a0ec 775 if (!(sb->s_flags & MS_RDONLY)) {
617ba13b 776 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
ac27a0ec 777 es->s_state = cpu_to_le16(sbi->s_mount_state);
ac27a0ec 778 }
58c5873a 779 if (!(sb->s_flags & MS_RDONLY))
a8e25a83
AB		 780 ext4_commit_super(sb, 1);
781
240799cd 782 if (sbi->s_proc) {
66acdcf4 783 remove_proc_entry("options", sbi->s_proc);
9f6200bb 784 remove_proc_entry(sb->s_id, ext4_proc_root);
240799cd 785 }
3197ebdb 786 kobject_del(&sbi->s_kobj);
ac27a0ec
DK		 787
788 for (i = 0; i < sbi->s_gdb_count; i++)
789 brelse(sbi->s_group_desc[i]);
b93b41d4
AV		 790 kvfree(sbi->s_group_desc);
791 kvfree(sbi->s_flex_groups);
57042651 792 percpu_counter_destroy(&sbi->s_freeclusters_counter);
ac27a0ec
DK		 793 percpu_counter_destroy(&sbi->s_freeinodes_counter);
794 percpu_counter_destroy(&sbi->s_dirs_counter);
57042651 795 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
ac27a0ec
DK		 796 brelse(sbi->s_sbh);
797#ifdef CONFIG_QUOTA
a2d4a646 798 for (i = 0; i < EXT4_MAXQUOTAS; i++)
ac27a0ec
DK		 799 kfree(sbi->s_qf_names[i]);
800#endif
801
802 /* Debugging code just in case the in-memory inode orphan list
803 * isn't empty. The on-disk one can be non-empty if we've
804 * detected an error and taken the fs readonly, but the
805 * in-memory list had better be clean by this point. */
806 if (!list_empty(&sbi->s_orphan))
807 dump_orphan_list(sb, sbi);
808 J_ASSERT(list_empty(&sbi->s_orphan));
809
f98393a6 810 invalidate_bdev(sb->s_bdev);
ac27a0ec
DK		 811 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
812 /*
813 * Invalidate the journal device's buffers. We don't want them
814 * floating about in memory - the physical journal device may
815 * hotswapped, and it breaks the `ro-after' testing code.
816 */
817 sync_blockdev(sbi->journal_bdev);
f98393a6 818 invalidate_bdev(sbi->journal_bdev);
617ba13b 819 ext4_blkdev_remove(sbi);
ac27a0ec 820 }
9c191f70
M		 821 if (sbi->s_mb_cache) {
822 ext4_xattr_destroy_cache(sbi->s_mb_cache);
823 sbi->s_mb_cache = NULL;
824 }
c5e06d10
JL		 825 if (sbi->s_mmp_tsk)
826 kthread_stop(sbi->s_mmp_tsk);
ac27a0ec 827 sb->s_fs_info = NULL;
3197ebdb
TT		 828 /*
829 * Now that we are completely done shutting down the
830 * superblock, we need to actually destroy the kobject.
831 */
3197ebdb
TT		 832 kobject_put(&sbi->s_kobj);
833 wait_for_completion(&sbi->s_kobj_unregister);
0441984a
DW		 834 if (sbi->s_chksum_driver)
835 crypto_free_shash(sbi->s_chksum_driver);
705895b6 836 kfree(sbi->s_blockgroup_lock);
ac27a0ec 837 kfree(sbi);
ac27a0ec
DK		 838}
839
e18b890b 840static struct kmem_cache *ext4_inode_cachep;
ac27a0ec
DK		 841
842/*
843 * Called inside transaction, so use GFP_NOFS
844 */
617ba13b 845static struct inode *ext4_alloc_inode(struct super_block *sb)
ac27a0ec 846{
617ba13b 847 struct ext4_inode_info *ei;
ac27a0ec 848
e6b4f8da 849 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
ac27a0ec
DK		 850 if (!ei)
851 return NULL;
0b8e58a1 852
ac27a0ec 853 ei->vfs_inode.i_version = 1;
202ee5df 854 spin_lock_init(&ei->i_raw_lock);
c9de560d
AT		 855 INIT_LIST_HEAD(&ei->i_prealloc_list);
856 spin_lock_init(&ei->i_prealloc_lock);
9a26b661
ZL		 857 ext4_es_init_tree(&ei->i_es_tree);
858 rwlock_init(&ei->i_es_lock);
edaa53ca 859 INIT_LIST_HEAD(&ei->i_es_list);
eb68d0e2 860 ei->i_es_all_nr = 0;
edaa53ca 861 ei->i_es_shk_nr = 0;
dd475925 862 ei->i_es_shrink_lblk = 0;
d2a17637
MC		 863 ei->i_reserved_data_blocks = 0;
864 ei->i_reserved_meta_blocks = 0;
865 ei->i_allocated_meta_blocks = 0;
9d0be502 866 ei->i_da_metadata_calc_len = 0;
7e731bc9 867 ei->i_da_metadata_calc_last_lblock = 0;
d2a17637 868 spin_lock_init(&(ei->i_block_reservation_lock));
a9e7f447
DM		 869#ifdef CONFIG_QUOTA
870 ei->i_reserved_quota = 0;
96c7e0d9 871 memset(&ei->i_dquot, 0, sizeof(ei->i_dquot));
a9e7f447 872#endif
8aefcd55 873 ei->jinode = NULL;
2e8fa54e 874 INIT_LIST_HEAD(&ei->i_rsv_conversion_list);
744692dc 875 spin_lock_init(&ei->i_completed_io_lock);
b436b9be
JK		 876 ei->i_sync_tid = 0;
877 ei->i_datasync_tid = 0;
f7ad6d2e 878 atomic_set(&ei->i_ioend_count, 0);
e27f41e1 879 atomic_set(&ei->i_unwritten, 0);
2e8fa54e 880 INIT_WORK(&ei->i_rsv_conversion_work, ext4_end_io_rsv_work);
b30ab0e0
MH		 881#ifdef CONFIG_EXT4_FS_ENCRYPTION
882 ei->i_encryption_key.mode = EXT4_ENCRYPTION_MODE_INVALID;
883#endif
0b8e58a1 884
ac27a0ec
DK		 885 return &ei->vfs_inode;
886}
887
7ff9c073
TT		 888static int ext4_drop_inode(struct inode *inode)
889{
890 int drop = generic_drop_inode(inode);
891
892 trace_ext4_drop_inode(inode, drop);
893 return drop;
894}
895
fa0d7e3d
NP		 896static void ext4_i_callback(struct rcu_head *head)
897{
898 struct inode *inode = container_of(head, struct inode, i_rcu);
fa0d7e3d
NP		 899 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
900}
901
617ba13b 902static void ext4_destroy_inode(struct inode *inode)
ac27a0ec 903{
9f7dd93d 904 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
b31e1552
ES		 905 ext4_msg(inode->i_sb, KERN_ERR,
906 "Inode %lu (%p): orphan list check failed!",
907 inode->i_ino, EXT4_I(inode));
9f7dd93d
VA		 908 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
909 EXT4_I(inode), sizeof(struct ext4_inode_info),
910 true);
911 dump_stack();
912 }
fa0d7e3d 913 call_rcu(&inode->i_rcu, ext4_i_callback);
ac27a0ec
DK		 914}
915
51cc5068 916static void init_once(void *foo)
ac27a0ec 917{
617ba13b 918 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
ac27a0ec 919
a35afb83 920 INIT_LIST_HEAD(&ei->i_orphan);
a35afb83 921 init_rwsem(&ei->xattr_sem);
0e855ac8 922 init_rwsem(&ei->i_data_sem);
a35afb83 923 inode_init_once(&ei->vfs_inode);
ac27a0ec
DK		 924}
925
e67bc2b3 926static int __init init_inodecache(void)
ac27a0ec 927{
617ba13b
MC		 928 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
929 sizeof(struct ext4_inode_info),
ac27a0ec
DK		 930 0, (SLAB_RECLAIM_ACCOUNT|
931 SLAB_MEM_SPREAD),
20c2df83 932 init_once);
617ba13b 933 if (ext4_inode_cachep == NULL)
ac27a0ec
DK		 934 return -ENOMEM;
935 return 0;
936}
937
938static void destroy_inodecache(void)
939{
8c0a8537
KS		 940 /*
941 * Make sure all delayed rcu free inodes are flushed before we
942 * destroy cache.
943 */
944 rcu_barrier();
617ba13b 945 kmem_cache_destroy(ext4_inode_cachep);
ac27a0ec
DK		 946}
947
0930fcc1 948void ext4_clear_inode(struct inode *inode)
ac27a0ec 949{
0930fcc1 950 invalidate_inode_buffers(inode);
dbd5768f 951 clear_inode(inode);
9f754758 952 dquot_drop(inode);
c2ea3fde 953 ext4_discard_preallocations(inode);
51865fda 954 ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS);
8aefcd55
TT		 955 if (EXT4_I(inode)->jinode) {
956 jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode),
957 EXT4_I(inode)->jinode);
958 jbd2_free_inode(EXT4_I(inode)->jinode);
959 EXT4_I(inode)->jinode = NULL;
960 }
ac27a0ec
DK		 961}
962
1b961ac0 963static struct inode *ext4_nfs_get_inode(struct super_block *sb,
0b8e58a1 964 u64 ino, u32 generation)
ac27a0ec 965{
ac27a0ec 966 struct inode *inode;
ac27a0ec 967
617ba13b 968 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
ac27a0ec 969 return ERR_PTR(-ESTALE);
617ba13b 970 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
ac27a0ec
DK		 971 return ERR_PTR(-ESTALE);
972
973 /* iget isn't really right if the inode is currently unallocated!!
974 *
617ba13b 975 * ext4_read_inode will return a bad_inode if the inode had been
ac27a0ec
DK		 976 * deleted, so we should be safe.
977 *
978 * Currently we don't know the generation for parent directory, so
979 * a generation of 0 means "accept any"
980 */
f4bb2981 981 inode = ext4_iget_normal(sb, ino);
1d1fe1ee
DH		 982 if (IS_ERR(inode))
983 return ERR_CAST(inode);
984 if (generation && inode->i_generation != generation) {
ac27a0ec
DK		 985 iput(inode);
986 return ERR_PTR(-ESTALE);
987 }
1b961ac0
CH		 988
989 return inode;
990}
991
992static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
0b8e58a1 993 int fh_len, int fh_type)
1b961ac0
CH		 994{
995 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
996 ext4_nfs_get_inode);
997}
998
999static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
0b8e58a1 1000 int fh_len, int fh_type)
1b961ac0
CH		 1001{
1002 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
1003 ext4_nfs_get_inode);
ac27a0ec
DK		 1004}
1005
c39a7f84
TO		 1006/*
1007 * Try to release metadata pages (indirect blocks, directories) which are
1008 * mapped via the block device. Since these pages could have journal heads
1009 * which would prevent try_to_free_buffers() from freeing them, we must use
1010 * jbd2 layer's try_to_free_buffers() function to release them.
1011 */
0b8e58a1
AD		 1012static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
1013 gfp_t wait)
c39a7f84
TO		 1014{
1015 journal_t *journal = EXT4_SB(sb)->s_journal;
1016
1017 WARN_ON(PageChecked(page));
1018 if (!page_has_buffers(page))
1019 return 0;
1020 if (journal)
1021 return jbd2_journal_try_to_free_buffers(journal, page,
1022 wait & ~__GFP_WAIT);
1023 return try_to_free_buffers(page);
1024}
1025
ac27a0ec 1026#ifdef CONFIG_QUOTA
af5bc92d 1027#define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
2b2d6d01 1028#define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
ac27a0ec 1029
617ba13b
MC		 1030static int ext4_write_dquot(struct dquot *dquot);
1031static int ext4_acquire_dquot(struct dquot *dquot);
1032static int ext4_release_dquot(struct dquot *dquot);
1033static int ext4_mark_dquot_dirty(struct dquot *dquot);
1034static int ext4_write_info(struct super_block *sb, int type);
6f28e087 1035static int ext4_quota_on(struct super_block *sb, int type, int format_id,
f00c9e44 1036 struct path *path);
ca0e05e4 1037static int ext4_quota_off(struct super_block *sb, int type);
617ba13b
MC		 1038static int ext4_quota_on_mount(struct super_block *sb, int type);
1039static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec 1040 size_t len, loff_t off);
617ba13b 1041static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec 1042 const char *data, size_t len, loff_t off);
7c319d32
AK		 1043static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
1044 unsigned int flags);
1045static int ext4_enable_quotas(struct super_block *sb);
ac27a0ec 1046
96c7e0d9
JK		 1047static struct dquot **ext4_get_dquots(struct inode *inode)
1048{
1049 return EXT4_I(inode)->i_dquot;
1050}
1051
61e225dc 1052static const struct dquot_operations ext4_quota_operations = {
60e58e0f 1053 .get_reserved_space = ext4_get_reserved_space,
617ba13b
MC		 1054 .write_dquot = ext4_write_dquot,
1055 .acquire_dquot = ext4_acquire_dquot,
1056 .release_dquot = ext4_release_dquot,
1057 .mark_dirty = ext4_mark_dquot_dirty,
a5b5ee32
JK		 1058 .write_info = ext4_write_info,
1059 .alloc_dquot = dquot_alloc,
1060 .destroy_dquot = dquot_destroy,
ac27a0ec
DK		 1061};
1062
0d54b217 1063static const struct quotactl_ops ext4_qctl_operations = {
617ba13b 1064 .quota_on = ext4_quota_on,
ca0e05e4 1065 .quota_off = ext4_quota_off,
287a8095 1066 .quota_sync = dquot_quota_sync,
0a240339 1067 .get_state = dquot_get_state,
287a8095
CH		 1068 .set_info = dquot_set_dqinfo,
1069 .get_dqblk = dquot_get_dqblk,
1070 .set_dqblk = dquot_set_dqblk
ac27a0ec
DK		 1071};
1072#endif
1073
ee9b6d61 1074static const struct super_operations ext4_sops = {
617ba13b
MC		 1075 .alloc_inode = ext4_alloc_inode,
1076 .destroy_inode = ext4_destroy_inode,
617ba13b
MC		 1077 .write_inode = ext4_write_inode,
1078 .dirty_inode = ext4_dirty_inode,
7ff9c073 1079 .drop_inode = ext4_drop_inode,
0930fcc1 1080 .evict_inode = ext4_evict_inode,
617ba13b 1081 .put_super = ext4_put_super,
617ba13b 1082 .sync_fs = ext4_sync_fs,
c4be0c1d
TS		 1083 .freeze_fs = ext4_freeze,
1084 .unfreeze_fs = ext4_unfreeze,
617ba13b
MC		 1085 .statfs = ext4_statfs,
1086 .remount_fs = ext4_remount,
617ba13b 1087 .show_options = ext4_show_options,
ac27a0ec 1088#ifdef CONFIG_QUOTA
617ba13b
MC		 1089 .quota_read = ext4_quota_read,
1090 .quota_write = ext4_quota_write,
96c7e0d9 1091 .get_dquots = ext4_get_dquots,
ac27a0ec 1092#endif
c39a7f84 1093 .bdev_try_to_free_page = bdev_try_to_free_page,
ac27a0ec
DK		 1094};
1095
39655164 1096static const struct export_operations ext4_export_ops = {
1b961ac0
CH		 1097 .fh_to_dentry = ext4_fh_to_dentry,
1098 .fh_to_parent = ext4_fh_to_parent,
617ba13b 1099 .get_parent = ext4_get_parent,
ac27a0ec
DK		 1100};
1101
1102enum {
1103 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
1104 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
72578c33 1105 Opt_nouid32, Opt_debug, Opt_removed,
ac27a0ec 1106 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
72578c33 1107 Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload,
ad4eec61
ES		 1108 Opt_commit, Opt_min_batch_time, Opt_max_batch_time, Opt_journal_dev,
1109 Opt_journal_path, Opt_journal_checksum, Opt_journal_async_commit,
ac27a0ec 1110 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
6ddb2447 1111 Opt_data_err_abort, Opt_data_err_ignore, Opt_test_dummy_encryption,
ac27a0ec 1112 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
5a20bdfc 1113 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
ee4a3fcd 1114 Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err,
923ae0ff 1115 Opt_usrquota, Opt_grpquota, Opt_i_version, Opt_dax,
1449032b 1116 Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_mblk_io_submit,
a26f4992 1117 Opt_lazytime, Opt_nolazytime,
1449032b 1118 Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity,
5328e635 1119 Opt_inode_readahead_blks, Opt_journal_ioprio,
744692dc 1120 Opt_dioread_nolock, Opt_dioread_lock,
fc6cb1cd 1121 Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable,
c6d3d56d 1122 Opt_max_dir_size_kb, Opt_nojournal_checksum,
ac27a0ec
DK		 1123};
1124
a447c093 1125static const match_table_t tokens = {
ac27a0ec
DK		 1126 {Opt_bsd_df, "bsddf"},
1127 {Opt_minix_df, "minixdf"},
1128 {Opt_grpid, "grpid"},
1129 {Opt_grpid, "bsdgroups"},
1130 {Opt_nogrpid, "nogrpid"},
1131 {Opt_nogrpid, "sysvgroups"},
1132 {Opt_resgid, "resgid=%u"},
1133 {Opt_resuid, "resuid=%u"},
1134 {Opt_sb, "sb=%u"},
1135 {Opt_err_cont, "errors=continue"},
1136 {Opt_err_panic, "errors=panic"},
1137 {Opt_err_ro, "errors=remount-ro"},
1138 {Opt_nouid32, "nouid32"},
ac27a0ec 1139 {Opt_debug, "debug"},
72578c33
TT		 1140 {Opt_removed, "oldalloc"},
1141 {Opt_removed, "orlov"},
ac27a0ec
DK		 1142 {Opt_user_xattr, "user_xattr"},
1143 {Opt_nouser_xattr, "nouser_xattr"},
1144 {Opt_acl, "acl"},
1145 {Opt_noacl, "noacl"},
e3bb52ae 1146 {Opt_noload, "norecovery"},
5a916be1 1147 {Opt_noload, "noload"},
72578c33
TT		 1148 {Opt_removed, "nobh"},
1149 {Opt_removed, "bh"},
ac27a0ec 1150 {Opt_commit, "commit=%u"},
30773840
TT		 1151 {Opt_min_batch_time, "min_batch_time=%u"},
1152 {Opt_max_batch_time, "max_batch_time=%u"},
ac27a0ec 1153 {Opt_journal_dev, "journal_dev=%u"},
ad4eec61 1154 {Opt_journal_path, "journal_path=%s"},
818d276c 1155 {Opt_journal_checksum, "journal_checksum"},
c6d3d56d 1156 {Opt_nojournal_checksum, "nojournal_checksum"},
818d276c 1157 {Opt_journal_async_commit, "journal_async_commit"},
ac27a0ec
DK		 1158 {Opt_abort, "abort"},
1159 {Opt_data_journal, "data=journal"},
1160 {Opt_data_ordered, "data=ordered"},
1161 {Opt_data_writeback, "data=writeback"},
5bf5683a
HK		 1162 {Opt_data_err_abort, "data_err=abort"},
1163 {Opt_data_err_ignore, "data_err=ignore"},
ac27a0ec
DK		 1164 {Opt_offusrjquota, "usrjquota="},
1165 {Opt_usrjquota, "usrjquota=%s"},
1166 {Opt_offgrpjquota, "grpjquota="},
1167 {Opt_grpjquota, "grpjquota=%s"},
1168 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
1169 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
5a20bdfc 1170 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
ac27a0ec
DK		 1171 {Opt_grpquota, "grpquota"},
1172 {Opt_noquota, "noquota"},
1173 {Opt_quota, "quota"},
1174 {Opt_usrquota, "usrquota"},
1175 {Opt_barrier, "barrier=%u"},
06705bff
TT		 1176 {Opt_barrier, "barrier"},
1177 {Opt_nobarrier, "nobarrier"},
25ec56b5 1178 {Opt_i_version, "i_version"},
923ae0ff 1179 {Opt_dax, "dax"},
c9de560d 1180 {Opt_stripe, "stripe=%u"},
64769240 1181 {Opt_delalloc, "delalloc"},
a26f4992
TT		 1182 {Opt_lazytime, "lazytime"},
1183 {Opt_nolazytime, "nolazytime"},
dd919b98 1184 {Opt_nodelalloc, "nodelalloc"},
36ade451
JK		 1185 {Opt_removed, "mblk_io_submit"},
1186 {Opt_removed, "nomblk_io_submit"},
6fd058f7
TT		 1187 {Opt_block_validity, "block_validity"},
1188 {Opt_noblock_validity, "noblock_validity"},
240799cd 1189 {Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
b3881f74 1190 {Opt_journal_ioprio, "journal_ioprio=%u"},
afd4672d 1191 {Opt_auto_da_alloc, "auto_da_alloc=%u"},
06705bff
TT		 1192 {Opt_auto_da_alloc, "auto_da_alloc"},
1193 {Opt_noauto_da_alloc, "noauto_da_alloc"},
744692dc
JZ		 1194 {Opt_dioread_nolock, "dioread_nolock"},
1195 {Opt_dioread_lock, "dioread_lock"},
5328e635
ES		 1196 {Opt_discard, "discard"},
1197 {Opt_nodiscard, "nodiscard"},
fc6cb1cd
TT		 1198 {Opt_init_itable, "init_itable=%u"},
1199 {Opt_init_itable, "init_itable"},
1200 {Opt_noinit_itable, "noinit_itable"},
df981d03 1201 {Opt_max_dir_size_kb, "max_dir_size_kb=%u"},
6ddb2447 1202 {Opt_test_dummy_encryption, "test_dummy_encryption"},
c7198b9c
TT		 1203 {Opt_removed, "check=none"}, /* mount option from ext2/3 */
1204 {Opt_removed, "nocheck"}, /* mount option from ext2/3 */
1205 {Opt_removed, "reservation"}, /* mount option from ext2/3 */
1206 {Opt_removed, "noreservation"}, /* mount option from ext2/3 */
1207 {Opt_removed, "journal=%u"}, /* mount option from ext2/3 */
f3f12faa 1208 {Opt_err, NULL},
ac27a0ec
DK		 1209};
1210
617ba13b 1211static ext4_fsblk_t get_sb_block(void **data)
ac27a0ec 1212{
617ba13b 1213 ext4_fsblk_t sb_block;
ac27a0ec
DK		 1214 char *options = (char *) *data;
1215
1216 if (!options || strncmp(options, "sb=", 3) != 0)
1217 return 1; /* Default location */
0b8e58a1 1218
ac27a0ec 1219 options += 3;
0b8e58a1 1220 /* TODO: use simple_strtoll with >32bit ext4 */
ac27a0ec
DK		 1221 sb_block = simple_strtoul(options, &options, 0);
1222 if (*options && *options != ',') {
4776004f 1223 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
ac27a0ec
DK		 1224 (char *) *data);
1225 return 1;
1226 }
1227 if (*options == ',')
1228 options++;
1229 *data = (void *) options;
0b8e58a1 1230
ac27a0ec
DK		 1231 return sb_block;
1232}
1233
b3881f74 1234#define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
437ca0fd
DM		 1235static char deprecated_msg[] = "Mount option \"%s\" will be removed by %s\n"
1236 "Contact [email protected] if you think we should keep it.\n";
b3881f74 1237
56c50f11
DM		 1238#ifdef CONFIG_QUOTA
1239static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
1240{
1241 struct ext4_sb_info *sbi = EXT4_SB(sb);
1242 char *qname;
03dafb5f 1243 int ret = -1;
56c50f11
DM		 1244
1245 if (sb_any_quota_loaded(sb) &&
1246 !sbi->s_qf_names[qtype]) {
1247 ext4_msg(sb, KERN_ERR,
1248 "Cannot change journaled "
1249 "quota options when quota turned on");
57f73c2c 1250 return -1;
56c50f11 1251 }
262b4662
JK		 1252 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA)) {
1253 ext4_msg(sb, KERN_ERR, "Cannot set journaled quota options "
1254 "when QUOTA feature is enabled");
1255 return -1;
1256 }
56c50f11
DM		 1257 qname = match_strdup(args);
1258 if (!qname) {
1259 ext4_msg(sb, KERN_ERR,
1260 "Not enough memory for storing quotafile name");
57f73c2c 1261 return -1;
56c50f11 1262 }
03dafb5f
CG		 1263 if (sbi->s_qf_names[qtype]) {
1264 if (strcmp(sbi->s_qf_names[qtype], qname) == 0)
1265 ret = 1;
1266 else
1267 ext4_msg(sb, KERN_ERR,
1268 "%s quota file already specified",
1269 QTYPE2NAME(qtype));
1270 goto errout;
56c50f11 1271 }
03dafb5f 1272 if (strchr(qname, '/')) {
56c50f11
DM		 1273 ext4_msg(sb, KERN_ERR,
1274 "quotafile must be on filesystem root");
03dafb5f 1275 goto errout;
56c50f11 1276 }
03dafb5f 1277 sbi->s_qf_names[qtype] = qname;
fd8c37ec 1278 set_opt(sb, QUOTA);
56c50f11 1279 return 1;
03dafb5f
CG		 1280errout:
1281 kfree(qname);
1282 return ret;
56c50f11
DM		 1283}
1284
1285static int clear_qf_name(struct super_block *sb, int qtype)
1286{
1287
1288 struct ext4_sb_info *sbi = EXT4_SB(sb);
1289
1290 if (sb_any_quota_loaded(sb) &&
1291 sbi->s_qf_names[qtype]) {
1292 ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options"
1293 " when quota turned on");
57f73c2c 1294 return -1;
56c50f11 1295 }
03dafb5f 1296 kfree(sbi->s_qf_names[qtype]);
56c50f11
DM		 1297 sbi->s_qf_names[qtype] = NULL;
1298 return 1;
1299}
1300#endif
1301
26092bf5
TT		 1302#define MOPT_SET 0x0001
1303#define MOPT_CLEAR 0x0002
1304#define MOPT_NOSUPPORT 0x0004
1305#define MOPT_EXPLICIT 0x0008
1306#define MOPT_CLEAR_ERR 0x0010
1307#define MOPT_GTE0 0x0020
ac27a0ec 1308#ifdef CONFIG_QUOTA
26092bf5
TT		 1309#define MOPT_Q 0
1310#define MOPT_QFMT 0x0040
1311#else
1312#define MOPT_Q MOPT_NOSUPPORT
1313#define MOPT_QFMT MOPT_NOSUPPORT
ac27a0ec 1314#endif
26092bf5 1315#define MOPT_DATAJ 0x0080
8dc0aa8c
TT		 1316#define MOPT_NO_EXT2 0x0100
1317#define MOPT_NO_EXT3 0x0200
1318#define MOPT_EXT4_ONLY (MOPT_NO_EXT2 | MOPT_NO_EXT3)
ad4eec61 1319#define MOPT_STRING 0x0400
26092bf5
TT		 1320
1321static const struct mount_opts {
1322 int token;
1323 int mount_opt;
1324 int flags;
1325} ext4_mount_opts[] = {
1326 {Opt_minix_df, EXT4_MOUNT_MINIX_DF, MOPT_SET},
1327 {Opt_bsd_df, EXT4_MOUNT_MINIX_DF, MOPT_CLEAR},
1328 {Opt_grpid, EXT4_MOUNT_GRPID, MOPT_SET},
1329 {Opt_nogrpid, EXT4_MOUNT_GRPID, MOPT_CLEAR},
26092bf5
TT		 1330 {Opt_block_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_SET},
1331 {Opt_noblock_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_CLEAR},
8dc0aa8c
TT		 1332 {Opt_dioread_nolock, EXT4_MOUNT_DIOREAD_NOLOCK,
1333 MOPT_EXT4_ONLY | MOPT_SET},
1334 {Opt_dioread_lock, EXT4_MOUNT_DIOREAD_NOLOCK,
1335 MOPT_EXT4_ONLY | MOPT_CLEAR},
26092bf5
TT		 1336 {Opt_discard, EXT4_MOUNT_DISCARD, MOPT_SET},
1337 {Opt_nodiscard, EXT4_MOUNT_DISCARD, MOPT_CLEAR},
8dc0aa8c
TT		 1338 {Opt_delalloc, EXT4_MOUNT_DELALLOC,
1339 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
1340 {Opt_nodelalloc, EXT4_MOUNT_DELALLOC,
59d9fa5c 1341 MOPT_EXT4_ONLY | MOPT_CLEAR},
c6d3d56d
DW		 1342 {Opt_nojournal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
1343 MOPT_EXT4_ONLY | MOPT_CLEAR},
8dc0aa8c
TT		 1344 {Opt_journal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
1345 MOPT_EXT4_ONLY | MOPT_SET},
26092bf5 1346 {Opt_journal_async_commit, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT |
8dc0aa8c
TT		 1347 EXT4_MOUNT_JOURNAL_CHECKSUM),
1348 MOPT_EXT4_ONLY | MOPT_SET},
1349 {Opt_noload, EXT4_MOUNT_NOLOAD, MOPT_NO_EXT2 | MOPT_SET},
26092bf5
TT		 1350 {Opt_err_panic, EXT4_MOUNT_ERRORS_PANIC, MOPT_SET | MOPT_CLEAR_ERR},
1351 {Opt_err_ro, EXT4_MOUNT_ERRORS_RO, MOPT_SET | MOPT_CLEAR_ERR},
1352 {Opt_err_cont, EXT4_MOUNT_ERRORS_CONT, MOPT_SET | MOPT_CLEAR_ERR},
8dc0aa8c
TT		 1353 {Opt_data_err_abort, EXT4_MOUNT_DATA_ERR_ABORT,
1354 MOPT_NO_EXT2 | MOPT_SET},
1355 {Opt_data_err_ignore, EXT4_MOUNT_DATA_ERR_ABORT,
1356 MOPT_NO_EXT2 | MOPT_CLEAR},
26092bf5
TT		 1357 {Opt_barrier, EXT4_MOUNT_BARRIER, MOPT_SET},
1358 {Opt_nobarrier, EXT4_MOUNT_BARRIER, MOPT_CLEAR},
1359 {Opt_noauto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_SET},
1360 {Opt_auto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_CLEAR},
1361 {Opt_noinit_itable, EXT4_MOUNT_INIT_INODE_TABLE, MOPT_CLEAR},
1362 {Opt_commit, 0, MOPT_GTE0},
1363 {Opt_max_batch_time, 0, MOPT_GTE0},
1364 {Opt_min_batch_time, 0, MOPT_GTE0},
1365 {Opt_inode_readahead_blks, 0, MOPT_GTE0},
1366 {Opt_init_itable, 0, MOPT_GTE0},
923ae0ff 1367 {Opt_dax, EXT4_MOUNT_DAX, MOPT_SET},
26092bf5 1368 {Opt_stripe, 0, MOPT_GTE0},
0efb3b23
JK		 1369 {Opt_resuid, 0, MOPT_GTE0},
1370 {Opt_resgid, 0, MOPT_GTE0},
1371 {Opt_journal_dev, 0, MOPT_GTE0},
ad4eec61 1372 {Opt_journal_path, 0, MOPT_STRING},
0efb3b23 1373 {Opt_journal_ioprio, 0, MOPT_GTE0},
8dc0aa8c
TT		 1374 {Opt_data_journal, EXT4_MOUNT_JOURNAL_DATA, MOPT_NO_EXT2 | MOPT_DATAJ},
1375 {Opt_data_ordered, EXT4_MOUNT_ORDERED_DATA, MOPT_NO_EXT2 | MOPT_DATAJ},
1376 {Opt_data_writeback, EXT4_MOUNT_WRITEBACK_DATA,
1377 MOPT_NO_EXT2 | MOPT_DATAJ},
26092bf5
TT		 1378 {Opt_user_xattr, EXT4_MOUNT_XATTR_USER, MOPT_SET},
1379 {Opt_nouser_xattr, EXT4_MOUNT_XATTR_USER, MOPT_CLEAR},
03010a33 1380#ifdef CONFIG_EXT4_FS_POSIX_ACL
26092bf5
TT		 1381 {Opt_acl, EXT4_MOUNT_POSIX_ACL, MOPT_SET},
1382 {Opt_noacl, EXT4_MOUNT_POSIX_ACL, MOPT_CLEAR},
ac27a0ec 1383#else
26092bf5
TT		 1384 {Opt_acl, 0, MOPT_NOSUPPORT},
1385 {Opt_noacl, 0, MOPT_NOSUPPORT},
ac27a0ec 1386#endif
26092bf5
TT		 1387 {Opt_nouid32, EXT4_MOUNT_NO_UID32, MOPT_SET},
1388 {Opt_debug, EXT4_MOUNT_DEBUG, MOPT_SET},
1389 {Opt_quota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA, MOPT_SET | MOPT_Q},
1390 {Opt_usrquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA,
1391 MOPT_SET | MOPT_Q},
1392 {Opt_grpquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_GRPQUOTA,
1393 MOPT_SET | MOPT_Q},
1394 {Opt_noquota, (EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA |
1395 EXT4_MOUNT_GRPQUOTA), MOPT_CLEAR | MOPT_Q},
1396 {Opt_usrjquota, 0, MOPT_Q},
1397 {Opt_grpjquota, 0, MOPT_Q},
1398 {Opt_offusrjquota, 0, MOPT_Q},
1399 {Opt_offgrpjquota, 0, MOPT_Q},
1400 {Opt_jqfmt_vfsold, QFMT_VFS_OLD, MOPT_QFMT},
1401 {Opt_jqfmt_vfsv0, QFMT_VFS_V0, MOPT_QFMT},
1402 {Opt_jqfmt_vfsv1, QFMT_VFS_V1, MOPT_QFMT},
df981d03 1403 {Opt_max_dir_size_kb, 0, MOPT_GTE0},
6ddb2447 1404 {Opt_test_dummy_encryption, 0, MOPT_GTE0},
26092bf5
TT		 1405 {Opt_err, 0, 0}
1406};
1407
1408static int handle_mount_opt(struct super_block *sb, char *opt, int token,
1409 substring_t *args, unsigned long *journal_devnum,
1410 unsigned int *journal_ioprio, int is_remount)
1411{
1412 struct ext4_sb_info *sbi = EXT4_SB(sb);
1413 const struct mount_opts *m;
08cefc7a
EB		 1414 kuid_t uid;
1415 kgid_t gid;
26092bf5
TT		 1416 int arg = 0;
1417
57f73c2c
TT		 1418#ifdef CONFIG_QUOTA
1419 if (token == Opt_usrjquota)
1420 return set_qf_name(sb, USRQUOTA, &args[0]);
1421 else if (token == Opt_grpjquota)
1422 return set_qf_name(sb, GRPQUOTA, &args[0]);
1423 else if (token == Opt_offusrjquota)
1424 return clear_qf_name(sb, USRQUOTA);
1425 else if (token == Opt_offgrpjquota)
1426 return clear_qf_name(sb, GRPQUOTA);
1427#endif
26092bf5 1428 switch (token) {
f7048605
TT		 1429 case Opt_noacl:
1430 case Opt_nouser_xattr:
1431 ext4_msg(sb, KERN_WARNING, deprecated_msg, opt, "3.5");
1432 break;
26092bf5
TT		 1433 case Opt_sb:
1434 return 1; /* handled by get_sb_block() */
1435 case Opt_removed:
5f3633e3 1436 ext4_msg(sb, KERN_WARNING, "Ignoring removed %s option", opt);
26092bf5 1437 return 1;
26092bf5
TT		 1438 case Opt_abort:
1439 sbi->s_mount_flags |= EXT4_MF_FS_ABORTED;
1440 return 1;
1441 case Opt_i_version:
1442 sb->s_flags |= MS_I_VERSION;
1443 return 1;
a26f4992
TT		 1444 case Opt_lazytime:
1445 sb->s_flags |= MS_LAZYTIME;
1446 return 1;
1447 case Opt_nolazytime:
1448 sb->s_flags &= ~MS_LAZYTIME;
1449 return 1;
26092bf5
TT		 1450 }
1451
5f3633e3
JK		 1452 for (m = ext4_mount_opts; m->token != Opt_err; m++)
1453 if (token == m->token)
1454 break;
1455
1456 if (m->token == Opt_err) {
1457 ext4_msg(sb, KERN_ERR, "Unrecognized mount option \"%s\" "
1458 "or missing value", opt);
1459 return -1;
1460 }
1461
8dc0aa8c
TT		 1462 if ((m->flags & MOPT_NO_EXT2) && IS_EXT2_SB(sb)) {
1463 ext4_msg(sb, KERN_ERR,
1464 "Mount option \"%s\" incompatible with ext2", opt);
1465 return -1;
1466 }
1467 if ((m->flags & MOPT_NO_EXT3) && IS_EXT3_SB(sb)) {
1468 ext4_msg(sb, KERN_ERR,
1469 "Mount option \"%s\" incompatible with ext3", opt);
1470 return -1;
1471 }
1472
ad4eec61 1473 if (args->from && !(m->flags & MOPT_STRING) && match_int(args, &arg))
5f3633e3
JK		 1474 return -1;
1475 if (args->from && (m->flags & MOPT_GTE0) && (arg < 0))
1476 return -1;
1477 if (m->flags & MOPT_EXPLICIT)
1478 set_opt2(sb, EXPLICIT_DELALLOC);
1479 if (m->flags & MOPT_CLEAR_ERR)
1480 clear_opt(sb, ERRORS_MASK);
1481 if (token == Opt_noquota && sb_any_quota_loaded(sb)) {
1482 ext4_msg(sb, KERN_ERR, "Cannot change quota "
1483 "options when quota turned on");
1484 return -1;
1485 }
1486
1487 if (m->flags & MOPT_NOSUPPORT) {
1488 ext4_msg(sb, KERN_ERR, "%s option not supported", opt);
1489 } else if (token == Opt_commit) {
1490 if (arg == 0)
1491 arg = JBD2_DEFAULT_MAX_COMMIT_AGE;
1492 sbi->s_commit_interval = HZ * arg;
1493 } else if (token == Opt_max_batch_time) {
5f3633e3
JK		 1494 sbi->s_max_batch_time = arg;
1495 } else if (token == Opt_min_batch_time) {
1496 sbi->s_min_batch_time = arg;
1497 } else if (token == Opt_inode_readahead_blks) {
e33e60ea
JK		 1498 if (arg && (arg > (1 << 30) || !is_power_of_2(arg))) {
1499 ext4_msg(sb, KERN_ERR,
1500 "EXT4-fs: inode_readahead_blks must be "
1501 "0 or a power of 2 smaller than 2^31");
26092bf5 1502 return -1;
5f3633e3
JK		 1503 }
1504 sbi->s_inode_readahead_blks = arg;
1505 } else if (token == Opt_init_itable) {
1506 set_opt(sb, INIT_INODE_TABLE);
1507 if (!args->from)
1508 arg = EXT4_DEF_LI_WAIT_MULT;
1509 sbi->s_li_wait_mult = arg;
1510 } else if (token == Opt_max_dir_size_kb) {
1511 sbi->s_max_dir_size_kb = arg;
1512 } else if (token == Opt_stripe) {
1513 sbi->s_stripe = arg;
1514 } else if (token == Opt_resuid) {
1515 uid = make_kuid(current_user_ns(), arg);
1516 if (!uid_valid(uid)) {
1517 ext4_msg(sb, KERN_ERR, "Invalid uid value %d", arg);
26092bf5
TT		 1518 return -1;
1519 }
5f3633e3
JK		 1520 sbi->s_resuid = uid;
1521 } else if (token == Opt_resgid) {
1522 gid = make_kgid(current_user_ns(), arg);
1523 if (!gid_valid(gid)) {
1524 ext4_msg(sb, KERN_ERR, "Invalid gid value %d", arg);
1525 return -1;
1526 }
1527 sbi->s_resgid = gid;
1528 } else if (token == Opt_journal_dev) {
1529 if (is_remount) {
1530 ext4_msg(sb, KERN_ERR,
1531 "Cannot specify journal on remount");
1532 return -1;
1533 }
1534 *journal_devnum = arg;
ad4eec61
ES		 1535 } else if (token == Opt_journal_path) {
1536 char *journal_path;
1537 struct inode *journal_inode;
1538 struct path path;
1539 int error;
1540
1541 if (is_remount) {
1542 ext4_msg(sb, KERN_ERR,
1543 "Cannot specify journal on remount");
1544 return -1;
1545 }
1546 journal_path = match_strdup(&args[0]);
1547 if (!journal_path) {
1548 ext4_msg(sb, KERN_ERR, "error: could not dup "
1549 "journal device string");
1550 return -1;
1551 }
1552
1553 error = kern_path(journal_path, LOOKUP_FOLLOW, &path);
1554 if (error) {
1555 ext4_msg(sb, KERN_ERR, "error: could not find "
1556 "journal device path: error %d", error);
1557 kfree(journal_path);
1558 return -1;
1559 }
1560
2b0143b5 1561 journal_inode = d_inode(path.dentry);
ad4eec61
ES		 1562 if (!S_ISBLK(journal_inode->i_mode)) {
1563 ext4_msg(sb, KERN_ERR, "error: journal path %s "
1564 "is not a block device", journal_path);
1565 path_put(&path);
1566 kfree(journal_path);
1567 return -1;
1568 }
1569
1570 *journal_devnum = new_encode_dev(journal_inode->i_rdev);
1571 path_put(&path);
1572 kfree(journal_path);
5f3633e3
JK		 1573 } else if (token == Opt_journal_ioprio) {
1574 if (arg > 7) {
1575 ext4_msg(sb, KERN_ERR, "Invalid journal IO priority"
1576 " (must be 0-7)");
1577 return -1;
1578 }
1579 *journal_ioprio =
1580 IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, arg);
6ddb2447
TT		 1581 } else if (token == Opt_test_dummy_encryption) {
1582#ifdef CONFIG_EXT4_FS_ENCRYPTION
1583 sbi->s_mount_flags |= EXT4_MF_TEST_DUMMY_ENCRYPTION;
1584 ext4_msg(sb, KERN_WARNING,
1585 "Test dummy encryption mode enabled");
1586#else
1587 ext4_msg(sb, KERN_WARNING,
1588 "Test dummy encryption mount option ignored");
1589#endif
5f3633e3
JK		 1590 } else if (m->flags & MOPT_DATAJ) {
1591 if (is_remount) {
1592 if (!sbi->s_journal)
1593 ext4_msg(sb, KERN_WARNING, "Remounting file system with no journal so ignoring journalled data option");
1594 else if (test_opt(sb, DATA_FLAGS) != m->mount_opt) {
0efb3b23 1595 ext4_msg(sb, KERN_ERR,
26092bf5 1596 "Cannot change data mode on remount");
26092bf5 1597 return -1;
ac27a0ec 1598 }
26092bf5 1599 } else {
5f3633e3
JK		 1600 clear_opt(sb, DATA_FLAGS);
1601 sbi->s_mount_opt |= m->mount_opt;
ac27a0ec 1602 }
5f3633e3
JK		 1603#ifdef CONFIG_QUOTA
1604 } else if (m->flags & MOPT_QFMT) {
1605 if (sb_any_quota_loaded(sb) &&
1606 sbi->s_jquota_fmt != m->mount_opt) {
1607 ext4_msg(sb, KERN_ERR, "Cannot change journaled "
1608 "quota options when quota turned on");
1609 return -1;
1610 }
262b4662
JK		 1611 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
1612 EXT4_FEATURE_RO_COMPAT_QUOTA)) {
1613 ext4_msg(sb, KERN_ERR,
1614 "Cannot set journaled quota options "
1615 "when QUOTA feature is enabled");
1616 return -1;
1617 }
5f3633e3 1618 sbi->s_jquota_fmt = m->mount_opt;
923ae0ff
RZ		 1619#endif
1620#ifndef CONFIG_FS_DAX
1621 } else if (token == Opt_dax) {
1622 ext4_msg(sb, KERN_INFO, "dax option not supported");
1623 return -1;
5f3633e3
JK		 1624#endif
1625 } else {
1626 if (!args->from)
1627 arg = 1;
1628 if (m->flags & MOPT_CLEAR)
1629 arg = !arg;
1630 else if (unlikely(!(m->flags & MOPT_SET))) {
1631 ext4_msg(sb, KERN_WARNING,
1632 "buggy handling of option %s", opt);
1633 WARN_ON(1);
1634 return -1;
1635 }
1636 if (arg != 0)
1637 sbi->s_mount_opt |= m->mount_opt;
1638 else
1639 sbi->s_mount_opt &= ~m->mount_opt;
26092bf5 1640 }
5f3633e3 1641 return 1;
26092bf5
TT		 1642}
1643
1644static int parse_options(char *options, struct super_block *sb,
1645 unsigned long *journal_devnum,
1646 unsigned int *journal_ioprio,
1647 int is_remount)
1648{
1649 struct ext4_sb_info *sbi = EXT4_SB(sb);
1650 char *p;
1651 substring_t args[MAX_OPT_ARGS];
1652 int token;
1653
1654 if (!options)
1655 return 1;
1656
1657 while ((p = strsep(&options, ",")) != NULL) {
1658 if (!*p)
1659 continue;
1660 /*
1661 * Initialize args struct so we know whether arg was
1662 * found; some options take optional arguments.
1663 */
caecd0af 1664 args[0].to = args[0].from = NULL;
26092bf5
TT		 1665 token = match_token(p, tokens, args);
1666 if (handle_mount_opt(sb, p, token, args, journal_devnum,
1667 journal_ioprio, is_remount) < 0)
1668 return 0;
ac27a0ec
DK		 1669 }
1670#ifdef CONFIG_QUOTA
262b4662
JK		 1671 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) &&
1672 (test_opt(sb, USRQUOTA) || test_opt(sb, GRPQUOTA))) {
1673 ext4_msg(sb, KERN_ERR, "Cannot set quota options when QUOTA "
1674 "feature is enabled");
1675 return 0;
1676 }
ac27a0ec 1677 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
482a7425 1678 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
fd8c37ec 1679 clear_opt(sb, USRQUOTA);
ac27a0ec 1680
482a7425 1681 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
fd8c37ec 1682 clear_opt(sb, GRPQUOTA);
ac27a0ec 1683
56c50f11 1684 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
b31e1552
ES		 1685 ext4_msg(sb, KERN_ERR, "old and new quota "
1686 "format mixing");
ac27a0ec
DK		 1687 return 0;
1688 }
1689
1690 if (!sbi->s_jquota_fmt) {
b31e1552
ES		 1691 ext4_msg(sb, KERN_ERR, "journaled quota format "
1692 "not specified");
ac27a0ec
DK		 1693 return 0;
1694 }
ac27a0ec
DK		 1695 }
1696#endif
261cb20c
JK		 1697 if (test_opt(sb, DIOREAD_NOLOCK)) {
1698 int blocksize =
1699 BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);
1700
1701 if (blocksize < PAGE_CACHE_SIZE) {
1702 ext4_msg(sb, KERN_ERR, "can't mount with "
1703 "dioread_nolock if block size != PAGE_SIZE");
1704 return 0;
1705 }
1706 }
d4f76107
JK		 1707 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA &&
1708 test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
1709 ext4_msg(sb, KERN_ERR, "can't mount with journal_async_commit "
1710 "in data=ordered mode");
1711 return 0;
1712 }
ac27a0ec
DK		 1713 return 1;
1714}
1715
2adf6da8
TT		 1716static inline void ext4_show_quota_options(struct seq_file *seq,
1717 struct super_block *sb)
1718{
1719#if defined(CONFIG_QUOTA)
1720 struct ext4_sb_info *sbi = EXT4_SB(sb);
1721
1722 if (sbi->s_jquota_fmt) {
1723 char *fmtname = "";
1724
1725 switch (sbi->s_jquota_fmt) {
1726 case QFMT_VFS_OLD:
1727 fmtname = "vfsold";
1728 break;
1729 case QFMT_VFS_V0:
1730 fmtname = "vfsv0";
1731 break;
1732 case QFMT_VFS_V1:
1733 fmtname = "vfsv1";
1734 break;
1735 }
1736 seq_printf(seq, ",jqfmt=%s", fmtname);
1737 }
1738
1739 if (sbi->s_qf_names[USRQUOTA])
1740 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
1741
1742 if (sbi->s_qf_names[GRPQUOTA])
1743 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
2adf6da8
TT		 1744#endif
1745}
1746
5a916be1
TT		 1747static const char *token2str(int token)
1748{
50df9fd5 1749 const struct match_token *t;
5a916be1
TT		 1750
1751 for (t = tokens; t->token != Opt_err; t++)
1752 if (t->token == token && !strchr(t->pattern, '='))
1753 break;
1754 return t->pattern;
1755}
1756
2adf6da8
TT		 1757/*
1758 * Show an option if
1759 * - it's set to a non-default value OR
1760 * - if the per-sb default is different from the global default
1761 */
66acdcf4
TT		 1762static int _ext4_show_options(struct seq_file *seq, struct super_block *sb,
1763 int nodefs)
2adf6da8 1764{
2adf6da8
TT		 1765 struct ext4_sb_info *sbi = EXT4_SB(sb);
1766 struct ext4_super_block *es = sbi->s_es;
66acdcf4 1767 int def_errors, def_mount_opt = nodefs ? 0 : sbi->s_def_mount_opt;
5a916be1 1768 const struct mount_opts *m;
66acdcf4 1769 char sep = nodefs ? '\n' : ',';
2adf6da8 1770
66acdcf4
TT		 1771#define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep)
1772#define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg)
2adf6da8
TT		 1773
1774 if (sbi->s_sb_block != 1)
5a916be1
TT		 1775 SEQ_OPTS_PRINT("sb=%llu", sbi->s_sb_block);
1776
1777 for (m = ext4_mount_opts; m->token != Opt_err; m++) {
1778 int want_set = m->flags & MOPT_SET;
1779 if (((m->flags & (MOPT_SET|MOPT_CLEAR)) == 0) ||
1780 (m->flags & MOPT_CLEAR_ERR))
1781 continue;
66acdcf4 1782 if (!(m->mount_opt & (sbi->s_mount_opt ^ def_mount_opt)))
5a916be1
TT		 1783 continue; /* skip if same as the default */
1784 if ((want_set &&
1785 (sbi->s_mount_opt & m->mount_opt) != m->mount_opt) ||
1786 (!want_set && (sbi->s_mount_opt & m->mount_opt)))
1787 continue; /* select Opt_noFoo vs Opt_Foo */
1788 SEQ_OPTS_PRINT("%s", token2str(m->token));
2adf6da8 1789 }
5a916be1 1790
08cefc7a 1791 if (nodefs || !uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT4_DEF_RESUID)) ||
5a916be1 1792 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID)
08cefc7a
EB		 1793 SEQ_OPTS_PRINT("resuid=%u",
1794 from_kuid_munged(&init_user_ns, sbi->s_resuid));
1795 if (nodefs || !gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT4_DEF_RESGID)) ||
5a916be1 1796 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID)
08cefc7a
EB		 1797 SEQ_OPTS_PRINT("resgid=%u",
1798 from_kgid_munged(&init_user_ns, sbi->s_resgid));
66acdcf4 1799 def_errors = nodefs ? -1 : le16_to_cpu(es->s_errors);
5a916be1
TT		 1800 if (test_opt(sb, ERRORS_RO) && def_errors != EXT4_ERRORS_RO)
1801 SEQ_OPTS_PUTS("errors=remount-ro");
2adf6da8 1802 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
5a916be1 1803 SEQ_OPTS_PUTS("errors=continue");
2adf6da8 1804 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
5a916be1 1805 SEQ_OPTS_PUTS("errors=panic");
66acdcf4 1806 if (nodefs || sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ)
5a916be1 1807 SEQ_OPTS_PRINT("commit=%lu", sbi->s_commit_interval / HZ);
66acdcf4 1808 if (nodefs || sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME)
5a916be1 1809 SEQ_OPTS_PRINT("min_batch_time=%u", sbi->s_min_batch_time);
66acdcf4 1810 if (nodefs || sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME)
5a916be1 1811 SEQ_OPTS_PRINT("max_batch_time=%u", sbi->s_max_batch_time);
2adf6da8 1812 if (sb->s_flags & MS_I_VERSION)
5a916be1 1813 SEQ_OPTS_PUTS("i_version");
66acdcf4 1814 if (nodefs || sbi->s_stripe)
5a916be1 1815 SEQ_OPTS_PRINT("stripe=%lu", sbi->s_stripe);
66acdcf4 1816 if (EXT4_MOUNT_DATA_FLAGS & (sbi->s_mount_opt ^ def_mount_opt)) {
5a916be1
TT		 1817 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
1818 SEQ_OPTS_PUTS("data=journal");
1819 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
1820 SEQ_OPTS_PUTS("data=ordered");
1821 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
1822 SEQ_OPTS_PUTS("data=writeback");
1823 }
66acdcf4
TT		 1824 if (nodefs ||
1825 sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
5a916be1
TT		 1826 SEQ_OPTS_PRINT("inode_readahead_blks=%u",
1827 sbi->s_inode_readahead_blks);
2adf6da8 1828
66acdcf4
TT		 1829 if (nodefs || (test_opt(sb, INIT_INODE_TABLE) &&
1830 (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT)))
5a916be1 1831 SEQ_OPTS_PRINT("init_itable=%u", sbi->s_li_wait_mult);
df981d03
TT		 1832 if (nodefs || sbi->s_max_dir_size_kb)
1833 SEQ_OPTS_PRINT("max_dir_size_kb=%u", sbi->s_max_dir_size_kb);
2adf6da8
TT		 1834
1835 ext4_show_quota_options(seq, sb);
2adf6da8
TT		 1836 return 0;
1837}
1838
66acdcf4
TT		 1839static int ext4_show_options(struct seq_file *seq, struct dentry *root)
1840{
1841 return _ext4_show_options(seq, root->d_sb, 0);
1842}
1843
1844static int options_seq_show(struct seq_file *seq, void *offset)
1845{
1846 struct super_block *sb = seq->private;
1847 int rc;
1848
1849 seq_puts(seq, (sb->s_flags & MS_RDONLY) ? "ro" : "rw");
1850 rc = _ext4_show_options(seq, sb, 1);
1851 seq_puts(seq, "\n");
1852 return rc;
1853}
1854
1855static int options_open_fs(struct inode *inode, struct file *file)
1856{
d9dda78b 1857 return single_open(file, options_seq_show, PDE_DATA(inode));
66acdcf4
TT		 1858}
1859
1860static const struct file_operations ext4_seq_options_fops = {
1861 .owner = THIS_MODULE,
1862 .open = options_open_fs,
1863 .read = seq_read,
1864 .llseek = seq_lseek,
1865 .release = single_release,
1866};
1867
617ba13b 1868static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
ac27a0ec
DK		 1869 int read_only)
1870{
617ba13b 1871 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec
DK		 1872 int res = 0;
1873
617ba13b 1874 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
b31e1552
ES		 1875 ext4_msg(sb, KERN_ERR, "revision level too high, "
1876 "forcing read-only mode");
ac27a0ec
DK		 1877 res = MS_RDONLY;
1878 }
1879 if (read_only)
281b5995 1880 goto done;
617ba13b 1881 if (!(sbi->s_mount_state & EXT4_VALID_FS))
b31e1552
ES		 1882 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
1883 "running e2fsck is recommended");
c8b459f4 1884 else if (sbi->s_mount_state & EXT4_ERROR_FS)
b31e1552
ES		 1885 ext4_msg(sb, KERN_WARNING,
1886 "warning: mounting fs with errors, "
1887 "running e2fsck is recommended");
ed3ce80a 1888 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
ac27a0ec
DK		 1889 le16_to_cpu(es->s_mnt_count) >=
1890 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
b31e1552
ES		 1891 ext4_msg(sb, KERN_WARNING,
1892 "warning: maximal mount count reached, "
1893 "running e2fsck is recommended");
ac27a0ec
DK		 1894 else if (le32_to_cpu(es->s_checkinterval) &&
1895 (le32_to_cpu(es->s_lastcheck) +
1896 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
b31e1552
ES		 1897 ext4_msg(sb, KERN_WARNING,
1898 "warning: checktime reached, "
1899 "running e2fsck is recommended");
0b8e58a1 1900 if (!sbi->s_journal)
0390131b 1901 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
ac27a0ec 1902 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
617ba13b 1903 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
e8546d06 1904 le16_add_cpu(&es->s_mnt_count, 1);
ac27a0ec 1905 es->s_mtime = cpu_to_le32(get_seconds());
617ba13b 1906 ext4_update_dynamic_rev(sb);
0390131b
FM		 1907 if (sbi->s_journal)
1908 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
ac27a0ec 1909
e2d67052 1910 ext4_commit_super(sb, 1);
281b5995 1911done:
ac27a0ec 1912 if (test_opt(sb, DEBUG))
a9df9a49 1913 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
a2595b8a 1914 "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
ac27a0ec
DK		 1915 sb->s_blocksize,
1916 sbi->s_groups_count,
617ba13b
MC		 1917 EXT4_BLOCKS_PER_GROUP(sb),
1918 EXT4_INODES_PER_GROUP(sb),
a2595b8a 1919 sbi->s_mount_opt, sbi->s_mount_opt2);
ac27a0ec 1920
7abc52c2 1921 cleancache_init_fs(sb);
ac27a0ec
DK		 1922 return res;
1923}
1924
117fff10
TT		 1925int ext4_alloc_flex_bg_array(struct super_block *sb, ext4_group_t ngroup)
1926{
1927 struct ext4_sb_info *sbi = EXT4_SB(sb);
1928 struct flex_groups *new_groups;
1929 int size;
1930
1931 if (!sbi->s_log_groups_per_flex)
1932 return 0;
1933
1934 size = ext4_flex_group(sbi, ngroup - 1) + 1;
1935 if (size <= sbi->s_flex_groups_allocated)
1936 return 0;
1937
1938 size = roundup_pow_of_two(size * sizeof(struct flex_groups));
1939 new_groups = ext4_kvzalloc(size, GFP_KERNEL);
1940 if (!new_groups) {
1941 ext4_msg(sb, KERN_ERR, "not enough memory for %d flex groups",
1942 size / (int) sizeof(struct flex_groups));
1943 return -ENOMEM;
1944 }
1945
1946 if (sbi->s_flex_groups) {
1947 memcpy(new_groups, sbi->s_flex_groups,
1948 (sbi->s_flex_groups_allocated *
1949 sizeof(struct flex_groups)));
b93b41d4 1950 kvfree(sbi->s_flex_groups);
117fff10
TT		 1951 }
1952 sbi->s_flex_groups = new_groups;
1953 sbi->s_flex_groups_allocated = size / sizeof(struct flex_groups);
1954 return 0;
1955}
1956
772cb7c8
JS		 1957static int ext4_fill_flex_info(struct super_block *sb)
1958{
1959 struct ext4_sb_info *sbi = EXT4_SB(sb);
1960 struct ext4_group_desc *gdp = NULL;
772cb7c8 1961 ext4_group_t flex_group;
117fff10 1962 int i, err;
772cb7c8 1963
503358ae 1964 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
d50f2ab6 1965 if (sbi->s_log_groups_per_flex < 1 || sbi->s_log_groups_per_flex > 31) {
772cb7c8
JS		 1966 sbi->s_log_groups_per_flex = 0;
1967 return 1;
1968 }
1969
117fff10
TT		 1970 err = ext4_alloc_flex_bg_array(sb, sbi->s_groups_count);
1971 if (err)
9933fc0a 1972 goto failed;
772cb7c8 1973
772cb7c8 1974 for (i = 0; i < sbi->s_groups_count; i++) {
88b6edd1 1975 gdp = ext4_get_group_desc(sb, i, NULL);
772cb7c8
JS		 1976
1977 flex_group = ext4_flex_group(sbi, i);
7ad9bb65
TT		 1978 atomic_add(ext4_free_inodes_count(sb, gdp),
1979 &sbi->s_flex_groups[flex_group].free_inodes);
90ba983f
TT		 1980 atomic64_add(ext4_free_group_clusters(sb, gdp),
1981 &sbi->s_flex_groups[flex_group].free_clusters);
7ad9bb65
TT		 1982 atomic_add(ext4_used_dirs_count(sb, gdp),
1983 &sbi->s_flex_groups[flex_group].used_dirs);
772cb7c8
JS		 1984 }
1985
1986 return 1;
1987failed:
1988 return 0;
1989}
1990
feb0ab32
DW		 1991static __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
1992 struct ext4_group_desc *gdp)
717d50e4 1993{
feb0ab32 1994 int offset;
717d50e4 1995 __u16 crc = 0;
feb0ab32 1996 __le32 le_group = cpu_to_le32(block_group);
717d50e4 1997
9aa5d32b 1998 if (ext4_has_metadata_csum(sbi->s_sb)) {
feb0ab32 1999 /* Use new metadata_csum algorithm */
d6a77105 2000 __le16 save_csum;
feb0ab32
DW		 2001 __u32 csum32;
2002
d6a77105 2003 save_csum = gdp->bg_checksum;
feb0ab32
DW		 2004 gdp->bg_checksum = 0;
2005 csum32 = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&le_group,
2006 sizeof(le_group));
2007 csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp,
2008 sbi->s_desc_size);
d6a77105 2009 gdp->bg_checksum = save_csum;
feb0ab32
DW		 2010
2011 crc = csum32 & 0xFFFF;
2012 goto out;
717d50e4
AD		 2013 }
2014
feb0ab32 2015 /* old crc16 code */
813d32f9
DW		 2016 if (!(sbi->s_es->s_feature_ro_compat &
2017 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)))
2018 return 0;
2019
feb0ab32
DW		 2020 offset = offsetof(struct ext4_group_desc, bg_checksum);
2021
2022 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
2023 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
2024 crc = crc16(crc, (__u8 *)gdp, offset);
2025 offset += sizeof(gdp->bg_checksum); /* skip checksum */
2026 /* for checksum of struct ext4_group_desc do the rest...*/
2027 if ((sbi->s_es->s_feature_incompat &
2028 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) &&
2029 offset < le16_to_cpu(sbi->s_es->s_desc_size))
2030 crc = crc16(crc, (__u8 *)gdp + offset,
2031 le16_to_cpu(sbi->s_es->s_desc_size) -
2032 offset);
2033
2034out:
717d50e4
AD		 2035 return cpu_to_le16(crc);
2036}
2037
feb0ab32 2038int ext4_group_desc_csum_verify(struct super_block *sb, __u32 block_group,
717d50e4
AD		 2039 struct ext4_group_desc *gdp)
2040{
feb0ab32
DW		 2041 if (ext4_has_group_desc_csum(sb) &&
2042 (gdp->bg_checksum != ext4_group_desc_csum(EXT4_SB(sb),
2043 block_group, gdp)))
717d50e4
AD		 2044 return 0;
2045
2046 return 1;
2047}
2048
feb0ab32
DW		 2049void ext4_group_desc_csum_set(struct super_block *sb, __u32 block_group,
2050 struct ext4_group_desc *gdp)
2051{
2052 if (!ext4_has_group_desc_csum(sb))
2053 return;
2054 gdp->bg_checksum = ext4_group_desc_csum(EXT4_SB(sb), block_group, gdp);
2055}
2056
ac27a0ec 2057/* Called at mount-time, super-block is locked */
bfff6873
LC		 2058static int ext4_check_descriptors(struct super_block *sb,
2059 ext4_group_t *first_not_zeroed)
ac27a0ec 2060{
617ba13b
MC		 2061 struct ext4_sb_info *sbi = EXT4_SB(sb);
2062 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
2063 ext4_fsblk_t last_block;
bd81d8ee
LV		 2064 ext4_fsblk_t block_bitmap;
2065 ext4_fsblk_t inode_bitmap;
2066 ext4_fsblk_t inode_table;
ce421581 2067 int flexbg_flag = 0;
bfff6873 2068 ext4_group_t i, grp = sbi->s_groups_count;
ac27a0ec 2069
ce421581
JS		 2070 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
2071 flexbg_flag = 1;
2072
af5bc92d 2073 ext4_debug("Checking group descriptors");
ac27a0ec 2074
197cd65a
AM		 2075 for (i = 0; i < sbi->s_groups_count; i++) {
2076 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
2077
ce421581 2078 if (i == sbi->s_groups_count - 1 || flexbg_flag)
bd81d8ee 2079 last_block = ext4_blocks_count(sbi->s_es) - 1;
ac27a0ec
DK		 2080 else
2081 last_block = first_block +
617ba13b 2082 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
ac27a0ec 2083
bfff6873
LC		 2084 if ((grp == sbi->s_groups_count) &&
2085 !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2086 grp = i;
2087
8fadc143 2088 block_bitmap = ext4_block_bitmap(sb, gdp);
2b2d6d01 2089 if (block_bitmap < first_block || block_bitmap > last_block) {
b31e1552 2090 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2091 "Block bitmap for group %u not in group "
b31e1552 2092 "(block %llu)!", i, block_bitmap);
ac27a0ec
DK		 2093 return 0;
2094 }
8fadc143 2095 inode_bitmap = ext4_inode_bitmap(sb, gdp);
2b2d6d01 2096 if (inode_bitmap < first_block || inode_bitmap > last_block) {
b31e1552 2097 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2098 "Inode bitmap for group %u not in group "
b31e1552 2099 "(block %llu)!", i, inode_bitmap);
ac27a0ec
DK		 2100 return 0;
2101 }
8fadc143 2102 inode_table = ext4_inode_table(sb, gdp);
bd81d8ee 2103 if (inode_table < first_block ||
2b2d6d01 2104 inode_table + sbi->s_itb_per_group - 1 > last_block) {
b31e1552 2105 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2106 "Inode table for group %u not in group "
b31e1552 2107 "(block %llu)!", i, inode_table);
ac27a0ec
DK		 2108 return 0;
2109 }
955ce5f5 2110 ext4_lock_group(sb, i);
feb0ab32 2111 if (!ext4_group_desc_csum_verify(sb, i, gdp)) {
b31e1552
ES		 2112 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2113 "Checksum for group %u failed (%u!=%u)",
2114 i, le16_to_cpu(ext4_group_desc_csum(sbi, i,
2115 gdp)), le16_to_cpu(gdp->bg_checksum));
7ee1ec4c 2116 if (!(sb->s_flags & MS_RDONLY)) {
955ce5f5 2117 ext4_unlock_group(sb, i);
8a266467 2118 return 0;
7ee1ec4c 2119 }
717d50e4 2120 }
955ce5f5 2121 ext4_unlock_group(sb, i);
ce421581
JS		 2122 if (!flexbg_flag)
2123 first_block += EXT4_BLOCKS_PER_GROUP(sb);
ac27a0ec 2124 }
bfff6873
LC		 2125 if (NULL != first_not_zeroed)
2126 *first_not_zeroed = grp;
ac27a0ec
DK		 2127 return 1;
2128}
2129
617ba13b 2130/* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
ac27a0ec
DK		 2131 * the superblock) which were deleted from all directories, but held open by
2132 * a process at the time of a crash. We walk the list and try to delete these
2133 * inodes at recovery time (only with a read-write filesystem).
2134 *
2135 * In order to keep the orphan inode chain consistent during traversal (in
2136 * case of crash during recovery), we link each inode into the superblock
2137 * orphan list_head and handle it the same way as an inode deletion during
2138 * normal operation (which journals the operations for us).
2139 *
2140 * We only do an iget() and an iput() on each inode, which is very safe if we
2141 * accidentally point at an in-use or already deleted inode. The worst that
2142 * can happen in this case is that we get a "bit already cleared" message from
617ba13b 2143 * ext4_free_inode(). The only reason we would point at a wrong inode is if
ac27a0ec
DK		 2144 * e2fsck was run on this filesystem, and it must have already done the orphan
2145 * inode cleanup for us, so we can safely abort without any further action.
2146 */
2b2d6d01
TT		 2147static void ext4_orphan_cleanup(struct super_block *sb,
2148 struct ext4_super_block *es)
ac27a0ec
DK		 2149{
2150 unsigned int s_flags = sb->s_flags;
2151 int nr_orphans = 0, nr_truncates = 0;
2152#ifdef CONFIG_QUOTA
2153 int i;
2154#endif
2155 if (!es->s_last_orphan) {
2156 jbd_debug(4, "no orphan inodes to clean up\n");
2157 return;
2158 }
2159
a8f48a95 2160 if (bdev_read_only(sb->s_bdev)) {
b31e1552
ES		 2161 ext4_msg(sb, KERN_ERR, "write access "
2162 "unavailable, skipping orphan cleanup");
a8f48a95
ES		 2163 return;
2164 }
2165
d39195c3
AG		 2166 /* Check if feature set would not allow a r/w mount */
2167 if (!ext4_feature_set_ok(sb, 0)) {
2168 ext4_msg(sb, KERN_INFO, "Skipping orphan cleanup due to "
2169 "unknown ROCOMPAT features");
2170 return;
2171 }
2172
617ba13b 2173 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
c25f9bc6
ES		 2174 /* don't clear list on RO mount w/ errors */
2175 if (es->s_last_orphan && !(s_flags & MS_RDONLY)) {
84474976 2176 ext4_msg(sb, KERN_INFO, "Errors on filesystem, "
ac27a0ec 2177 "clearing orphan list.\n");
c25f9bc6
ES		 2178 es->s_last_orphan = 0;
2179 }
ac27a0ec
DK		 2180 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2181 return;
2182 }
2183
2184 if (s_flags & MS_RDONLY) {
b31e1552 2185 ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
ac27a0ec
DK		 2186 sb->s_flags &= ~MS_RDONLY;
2187 }
2188#ifdef CONFIG_QUOTA
2189 /* Needed for iput() to work correctly and not trash data */
2190 sb->s_flags |= MS_ACTIVE;
2191 /* Turn on quotas so that they are updated correctly */
a2d4a646 2192 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
617ba13b
MC		 2193 if (EXT4_SB(sb)->s_qf_names[i]) {
2194 int ret = ext4_quota_on_mount(sb, i);
ac27a0ec 2195 if (ret < 0)
b31e1552
ES		 2196 ext4_msg(sb, KERN_ERR,
2197 "Cannot turn on journaled "
2198 "quota: error %d", ret);
ac27a0ec
DK		 2199 }
2200 }
2201#endif
2202
2203 while (es->s_last_orphan) {
2204 struct inode *inode;
2205
97bd42b9
JB		 2206 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
2207 if (IS_ERR(inode)) {
ac27a0ec
DK		 2208 es->s_last_orphan = 0;
2209 break;
2210 }
2211
617ba13b 2212 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
871a2931 2213 dquot_initialize(inode);
ac27a0ec 2214 if (inode->i_nlink) {
566370a2
PT		 2215 if (test_opt(sb, DEBUG))
2216 ext4_msg(sb, KERN_DEBUG,
2217 "%s: truncating inode %lu to %lld bytes",
2218 __func__, inode->i_ino, inode->i_size);
e5f8eab8 2219 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
ac27a0ec 2220 inode->i_ino, inode->i_size);
721e3eba 2221 mutex_lock(&inode->i_mutex);
55f252c9 2222 truncate_inode_pages(inode->i_mapping, inode->i_size);
617ba13b 2223 ext4_truncate(inode);
721e3eba 2224 mutex_unlock(&inode->i_mutex);
ac27a0ec
DK		 2225 nr_truncates++;
2226 } else {
566370a2
PT		 2227 if (test_opt(sb, DEBUG))
2228 ext4_msg(sb, KERN_DEBUG,
2229 "%s: deleting unreferenced inode %lu",
2230 __func__, inode->i_ino);
ac27a0ec
DK		 2231 jbd_debug(2, "deleting unreferenced inode %lu\n",
2232 inode->i_ino);
2233 nr_orphans++;
2234 }
2235 iput(inode); /* The delete magic happens here! */
2236 }
2237
2b2d6d01 2238#define PLURAL(x) (x), ((x) == 1) ? "" : "s"
ac27a0ec
DK		 2239
2240 if (nr_orphans)
b31e1552
ES		 2241 ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
2242 PLURAL(nr_orphans));
ac27a0ec 2243 if (nr_truncates)
b31e1552
ES		 2244 ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
2245 PLURAL(nr_truncates));
ac27a0ec
DK		 2246#ifdef CONFIG_QUOTA
2247 /* Turn quotas off */
a2d4a646 2248 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
ac27a0ec 2249 if (sb_dqopt(sb)->files[i])
287a8095 2250 dquot_quota_off(sb, i);
ac27a0ec
DK		 2251 }
2252#endif
2253 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
2254}
0b8e58a1 2255
cd2291a4
ES		 2256/*
2257 * Maximal extent format file size.
2258 * Resulting logical blkno at s_maxbytes must fit in our on-disk
2259 * extent format containers, within a sector_t, and within i_blocks
2260 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
2261 * so that won't be a limiting factor.
2262 *
f17722f9
LC		 2263 * However there is other limiting factor. We do store extents in the form
2264 * of starting block and length, hence the resulting length of the extent
2265 * covering maximum file size must fit into on-disk format containers as
2266 * well. Given that length is always by 1 unit bigger than max unit (because
2267 * we count 0 as well) we have to lower the s_maxbytes by one fs block.
2268 *
cd2291a4
ES		 2269 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
2270 */
f287a1a5 2271static loff_t ext4_max_size(int blkbits, int has_huge_files)
cd2291a4
ES		 2272{
2273 loff_t res;
2274 loff_t upper_limit = MAX_LFS_FILESIZE;
2275
2276 /* small i_blocks in vfs inode? */
f287a1a5 2277 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
cd2291a4 2278 /*
90c699a9 2279 * CONFIG_LBDAF is not enabled implies the inode
cd2291a4
ES		 2280 * i_block represent total blocks in 512 bytes
2281 * 32 == size of vfs inode i_blocks * 8
2282 */
2283 upper_limit = (1LL << 32) - 1;
2284
2285 /* total blocks in file system block size */
2286 upper_limit >>= (blkbits - 9);
2287 upper_limit <<= blkbits;
2288 }
2289
f17722f9
LC		 2290 /*
2291 * 32-bit extent-start container, ee_block. We lower the maxbytes
2292 * by one fs block, so ee_len can cover the extent of maximum file
2293 * size
2294 */
2295 res = (1LL << 32) - 1;
cd2291a4 2296 res <<= blkbits;
cd2291a4
ES		 2297
2298 /* Sanity check against vm- & vfs- imposed limits */
2299 if (res > upper_limit)
2300 res = upper_limit;
2301
2302 return res;
2303}
ac27a0ec 2304
ac27a0ec 2305/*
cd2291a4 2306 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
0fc1b451
AK		 2307 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2308 * We need to be 1 filesystem block less than the 2^48 sector limit.
ac27a0ec 2309 */
f287a1a5 2310static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
ac27a0ec 2311{
617ba13b 2312 loff_t res = EXT4_NDIR_BLOCKS;
0fc1b451
AK		 2313 int meta_blocks;
2314 loff_t upper_limit;
0b8e58a1
AD		 2315 /* This is calculated to be the largest file size for a dense, block
2316 * mapped file such that the file's total number of 512-byte sectors,
2317 * including data and all indirect blocks, does not exceed (2^48 - 1).
2318 *
2319 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2320 * number of 512-byte sectors of the file.
0fc1b451
AK		 2321 */
2322
f287a1a5 2323 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
0fc1b451 2324 /*
90c699a9 2325 * !has_huge_files or CONFIG_LBDAF not enabled implies that
0b8e58a1
AD		 2326 * the inode i_block field represents total file blocks in
2327 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
0fc1b451
AK		 2328 */
2329 upper_limit = (1LL << 32) - 1;
2330
2331 /* total blocks in file system block size */
2332 upper_limit >>= (bits - 9);
2333
2334 } else {
8180a562
AK		 2335 /*
2336 * We use 48 bit ext4_inode i_blocks
2337 * With EXT4_HUGE_FILE_FL set the i_blocks
2338 * represent total number of blocks in
2339 * file system block size
2340 */
0fc1b451
AK		 2341 upper_limit = (1LL << 48) - 1;
2342
0fc1b451
AK		 2343 }
2344
2345 /* indirect blocks */
2346 meta_blocks = 1;
2347 /* double indirect blocks */
2348 meta_blocks += 1 + (1LL << (bits-2));
2349 /* tripple indirect blocks */
2350 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
2351
2352 upper_limit -= meta_blocks;
2353 upper_limit <<= bits;
ac27a0ec
DK		 2354
2355 res += 1LL << (bits-2);
2356 res += 1LL << (2*(bits-2));
2357 res += 1LL << (3*(bits-2));
2358 res <<= bits;
2359 if (res > upper_limit)
2360 res = upper_limit;
0fc1b451
AK		 2361
2362 if (res > MAX_LFS_FILESIZE)
2363 res = MAX_LFS_FILESIZE;
2364
ac27a0ec
DK		 2365 return res;
2366}
2367
617ba13b 2368static ext4_fsblk_t descriptor_loc(struct super_block *sb,
0b8e58a1 2369 ext4_fsblk_t logical_sb_block, int nr)
ac27a0ec 2370{
617ba13b 2371 struct ext4_sb_info *sbi = EXT4_SB(sb);
fd2d4291 2372 ext4_group_t bg, first_meta_bg;
ac27a0ec
DK		 2373 int has_super = 0;
2374
2375 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
2376
617ba13b 2377 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
ac27a0ec 2378 nr < first_meta_bg)
70bbb3e0 2379 return logical_sb_block + nr + 1;
ac27a0ec 2380 bg = sbi->s_desc_per_block * nr;
617ba13b 2381 if (ext4_bg_has_super(sb, bg))
ac27a0ec 2382 has_super = 1;
0b8e58a1 2383
bd63f6b0
DW		 2384 /*
2385 * If we have a meta_bg fs with 1k blocks, group 0's GDT is at
2386 * block 2, not 1. If s_first_data_block == 0 (bigalloc is enabled
2387 * on modern mke2fs or blksize > 1k on older mke2fs) then we must
2388 * compensate.
2389 */
2390 if (sb->s_blocksize == 1024 && nr == 0 &&
2391 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block) == 0)
2392 has_super++;
2393
617ba13b 2394 return (has_super + ext4_group_first_block_no(sb, bg));
ac27a0ec
DK		 2395}
2396
c9de560d
AT		 2397/**
2398 * ext4_get_stripe_size: Get the stripe size.
2399 * @sbi: In memory super block info
2400 *
2401 * If we have specified it via mount option, then
2402 * use the mount option value. If the value specified at mount time is
2403 * greater than the blocks per group use the super block value.
2404 * If the super block value is greater than blocks per group return 0.
2405 * Allocator needs it be less than blocks per group.
2406 *
2407 */
2408static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
2409{
2410 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
2411 unsigned long stripe_width =
2412 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
3eb08658 2413 int ret;
c9de560d
AT		 2414
2415 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
3eb08658
DE		 2416 ret = sbi->s_stripe;
2417 else if (stripe_width <= sbi->s_blocks_per_group)
2418 ret = stripe_width;
2419 else if (stride <= sbi->s_blocks_per_group)
2420 ret = stride;
2421 else
2422 ret = 0;
c9de560d 2423
3eb08658
DE		 2424 /*
2425 * If the stripe width is 1, this makes no sense and
2426 * we set it to 0 to turn off stripe handling code.
2427 */
2428 if (ret <= 1)
2429 ret = 0;
c9de560d 2430
3eb08658 2431 return ret;
c9de560d 2432}
ac27a0ec 2433
3197ebdb
TT		 2434/* sysfs supprt */
2435
2436struct ext4_attr {
2437 struct attribute attr;
2438 ssize_t (*show)(struct ext4_attr *, struct ext4_sb_info *, char *);
60e6679e 2439 ssize_t (*store)(struct ext4_attr *, struct ext4_sb_info *,
3197ebdb 2440 const char *, size_t);
f2d50a65
JK		 2441 union {
2442 int offset;
2443 int deprecated_val;
2444 } u;
3197ebdb
TT		 2445};
2446
27dd4385
LC		 2447static int parse_strtoull(const char *buf,
2448 unsigned long long max, unsigned long long *value)
2449{
2450 int ret;
2451
2452 ret = kstrtoull(skip_spaces(buf), 0, value);
2453 if (!ret && *value > max)
2454 ret = -EINVAL;
2455 return ret;
2456}
2457
3197ebdb
TT		 2458static ssize_t delayed_allocation_blocks_show(struct ext4_attr *a,
2459 struct ext4_sb_info *sbi,
2460 char *buf)
2461{
2462 return snprintf(buf, PAGE_SIZE, "%llu\n",
7b415bf6
AK		 2463 (s64) EXT4_C2B(sbi,
2464 percpu_counter_sum(&sbi->s_dirtyclusters_counter)));
3197ebdb
TT		 2465}
2466
2467static ssize_t session_write_kbytes_show(struct ext4_attr *a,
2468 struct ext4_sb_info *sbi, char *buf)
2469{
2470 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2471
f613dfcb
TT		 2472 if (!sb->s_bdev->bd_part)
2473 return snprintf(buf, PAGE_SIZE, "0\n");
3197ebdb
TT		 2474 return snprintf(buf, PAGE_SIZE, "%lu\n",
2475 (part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
2476 sbi->s_sectors_written_start) >> 1);
2477}
2478
2479static ssize_t lifetime_write_kbytes_show(struct ext4_attr *a,
2480 struct ext4_sb_info *sbi, char *buf)
2481{
2482 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2483
f613dfcb
TT		 2484 if (!sb->s_bdev->bd_part)
2485 return snprintf(buf, PAGE_SIZE, "0\n");
3197ebdb 2486 return snprintf(buf, PAGE_SIZE, "%llu\n",
a6b43e38 2487 (unsigned long long)(sbi->s_kbytes_written +
3197ebdb 2488 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
a6b43e38 2489 EXT4_SB(sb)->s_sectors_written_start) >> 1)));
3197ebdb
TT		 2490}
2491
2492static ssize_t inode_readahead_blks_store(struct ext4_attr *a,
2493 struct ext4_sb_info *sbi,
2494 const char *buf, size_t count)
2495{
2496 unsigned long t;
e1091b15 2497 int ret;
3197ebdb 2498
e1091b15
LC		 2499 ret = kstrtoul(skip_spaces(buf), 0, &t);
2500 if (ret)
2501 return ret;
3197ebdb 2502
e1091b15 2503 if (t && (!is_power_of_2(t) || t > 0x40000000))
3197ebdb
TT		 2504 return -EINVAL;
2505
2506 sbi->s_inode_readahead_blks = t;
2507 return count;
2508}
2509
2510static ssize_t sbi_ui_show(struct ext4_attr *a,
0b8e58a1 2511 struct ext4_sb_info *sbi, char *buf)
3197ebdb 2512{
f2d50a65 2513 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->u.offset);
3197ebdb
TT		 2514
2515 return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
2516}
2517
2518static ssize_t sbi_ui_store(struct ext4_attr *a,
2519 struct ext4_sb_info *sbi,
2520 const char *buf, size_t count)
2521{
f2d50a65 2522 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->u.offset);
3197ebdb 2523 unsigned long t;
e1091b15 2524 int ret;
3197ebdb 2525
e1091b15
LC		 2526 ret = kstrtoul(skip_spaces(buf), 0, &t);
2527 if (ret)
2528 return ret;
3197ebdb
TT		 2529 *ui = t;
2530 return count;
2531}
2532
52c198c6
LC		 2533static ssize_t es_ui_show(struct ext4_attr *a,
2534 struct ext4_sb_info *sbi, char *buf)
2535{
2536
2537 unsigned int *ui = (unsigned int *) (((char *) sbi->s_es) +
2538 a->u.offset);
2539
2540 return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
2541}
2542
27dd4385
LC		 2543static ssize_t reserved_clusters_show(struct ext4_attr *a,
2544 struct ext4_sb_info *sbi, char *buf)
2545{
2546 return snprintf(buf, PAGE_SIZE, "%llu\n",
2547 (unsigned long long) atomic64_read(&sbi->s_resv_clusters));
2548}
2549
2550static ssize_t reserved_clusters_store(struct ext4_attr *a,
2551 struct ext4_sb_info *sbi,
2552 const char *buf, size_t count)
2553{
2554 unsigned long long val;
2555 int ret;
2556
2557 if (parse_strtoull(buf, -1ULL, &val))
2558 return -EINVAL;
2559 ret = ext4_reserve_clusters(sbi, val);
2560
2561 return ret ? ret : count;
2562}
2563
2c0544b2
TT		 2564static ssize_t trigger_test_error(struct ext4_attr *a,
2565 struct ext4_sb_info *sbi,
2566 const char *buf, size_t count)
2567{
2568 int len = count;
2569
2570 if (!capable(CAP_SYS_ADMIN))
2571 return -EPERM;
2572
2573 if (len && buf[len-1] == '\n')
2574 len--;
2575
2576 if (len)
2577 ext4_error(sbi->s_sb, "%.*s", len, buf);
2578 return count;
2579}
2580
f2d50a65
JK		 2581static ssize_t sbi_deprecated_show(struct ext4_attr *a,
2582 struct ext4_sb_info *sbi, char *buf)
2583{
2584 return snprintf(buf, PAGE_SIZE, "%d\n", a->u.deprecated_val);
2585}
2586
3197ebdb
TT		 2587#define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \
2588static struct ext4_attr ext4_attr_##_name = { \
2589 .attr = {.name = __stringify(_name), .mode = _mode }, \
2590 .show = _show, \
2591 .store = _store, \
f2d50a65
JK		 2592 .u = { \
2593 .offset = offsetof(struct ext4_sb_info, _elname),\
2594 }, \
3197ebdb 2595}
52c198c6
LC		 2596
2597#define EXT4_ATTR_OFFSET_ES(_name,_mode,_show,_store,_elname) \
2598static struct ext4_attr ext4_attr_##_name = { \
2599 .attr = {.name = __stringify(_name), .mode = _mode }, \
2600 .show = _show, \
2601 .store = _store, \
2602 .u = { \
2603 .offset = offsetof(struct ext4_super_block, _elname), \
2604 }, \
2605}
2606
3197ebdb
TT		 2607#define EXT4_ATTR(name, mode, show, store) \
2608static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store)
2609
857ac889 2610#define EXT4_INFO_ATTR(name) EXT4_ATTR(name, 0444, NULL, NULL)
3197ebdb
TT		 2611#define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL)
2612#define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store)
52c198c6
LC		 2613
2614#define EXT4_RO_ATTR_ES_UI(name, elname) \
2615 EXT4_ATTR_OFFSET_ES(name, 0444, es_ui_show, NULL, elname)
3197ebdb
TT		 2616#define EXT4_RW_ATTR_SBI_UI(name, elname) \
2617 EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname)
52c198c6 2618
3197ebdb 2619#define ATTR_LIST(name) &ext4_attr_##name.attr
f2d50a65
JK		 2620#define EXT4_DEPRECATED_ATTR(_name, _val) \
2621static struct ext4_attr ext4_attr_##_name = { \
2622 .attr = {.name = __stringify(_name), .mode = 0444 }, \
2623 .show = sbi_deprecated_show, \
2624 .u = { \
2625 .deprecated_val = _val, \
2626 }, \
2627}
3197ebdb
TT		 2628
2629EXT4_RO_ATTR(delayed_allocation_blocks);
2630EXT4_RO_ATTR(session_write_kbytes);
2631EXT4_RO_ATTR(lifetime_write_kbytes);
27dd4385 2632EXT4_RW_ATTR(reserved_clusters);
3197ebdb
TT		 2633EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, sbi_ui_show,
2634 inode_readahead_blks_store, s_inode_readahead_blks);
11013911 2635EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal);
3197ebdb
TT		 2636EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats);
2637EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan);
2638EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan);
2639EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs);
2640EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request);
2641EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc);
f2d50a65 2642EXT4_DEPRECATED_ATTR(max_writeback_mb_bump, 128);
67a5da56 2643EXT4_RW_ATTR_SBI_UI(extent_max_zeroout_kb, s_extent_max_zeroout_kb);
2c0544b2 2644EXT4_ATTR(trigger_fs_error, 0200, NULL, trigger_test_error);
efbed4dc
TT		 2645EXT4_RW_ATTR_SBI_UI(err_ratelimit_interval_ms, s_err_ratelimit_state.interval);
2646EXT4_RW_ATTR_SBI_UI(err_ratelimit_burst, s_err_ratelimit_state.burst);
2647EXT4_RW_ATTR_SBI_UI(warning_ratelimit_interval_ms, s_warning_ratelimit_state.interval);
2648EXT4_RW_ATTR_SBI_UI(warning_ratelimit_burst, s_warning_ratelimit_state.burst);
2649EXT4_RW_ATTR_SBI_UI(msg_ratelimit_interval_ms, s_msg_ratelimit_state.interval);
2650EXT4_RW_ATTR_SBI_UI(msg_ratelimit_burst, s_msg_ratelimit_state.burst);
52c198c6
LC		 2651EXT4_RO_ATTR_ES_UI(errors_count, s_error_count);
2652EXT4_RO_ATTR_ES_UI(first_error_time, s_first_error_time);
2653EXT4_RO_ATTR_ES_UI(last_error_time, s_last_error_time);
3197ebdb
TT		 2654
2655static struct attribute *ext4_attrs[] = {
2656 ATTR_LIST(delayed_allocation_blocks),
2657 ATTR_LIST(session_write_kbytes),
2658 ATTR_LIST(lifetime_write_kbytes),
27dd4385 2659 ATTR_LIST(reserved_clusters),
3197ebdb 2660 ATTR_LIST(inode_readahead_blks),
11013911 2661 ATTR_LIST(inode_goal),
3197ebdb
TT		 2662 ATTR_LIST(mb_stats),
2663 ATTR_LIST(mb_max_to_scan),
2664 ATTR_LIST(mb_min_to_scan),
2665 ATTR_LIST(mb_order2_req),
2666 ATTR_LIST(mb_stream_req),
2667 ATTR_LIST(mb_group_prealloc),
55138e0b 2668 ATTR_LIST(max_writeback_mb_bump),
67a5da56 2669 ATTR_LIST(extent_max_zeroout_kb),
2c0544b2 2670 ATTR_LIST(trigger_fs_error),
efbed4dc
TT		 2671 ATTR_LIST(err_ratelimit_interval_ms),
2672 ATTR_LIST(err_ratelimit_burst),
2673 ATTR_LIST(warning_ratelimit_interval_ms),
2674 ATTR_LIST(warning_ratelimit_burst),
2675 ATTR_LIST(msg_ratelimit_interval_ms),
2676 ATTR_LIST(msg_ratelimit_burst),
52c198c6
LC		 2677 ATTR_LIST(errors_count),
2678 ATTR_LIST(first_error_time),
2679 ATTR_LIST(last_error_time),
3197ebdb
TT		 2680 NULL,
2681};
2682
857ac889
LC		 2683/* Features this copy of ext4 supports */
2684EXT4_INFO_ATTR(lazy_itable_init);
27ee40df 2685EXT4_INFO_ATTR(batched_discard);
5e7bbef1 2686EXT4_INFO_ATTR(meta_bg_resize);
6ddb2447 2687EXT4_INFO_ATTR(encryption);
857ac889
LC		 2688
2689static struct attribute *ext4_feat_attrs[] = {
2690 ATTR_LIST(lazy_itable_init),
27ee40df 2691 ATTR_LIST(batched_discard),
5e7bbef1 2692 ATTR_LIST(meta_bg_resize),
6ddb2447 2693 ATTR_LIST(encryption),
857ac889
LC		 2694 NULL,
2695};
2696
3197ebdb
TT		 2697static ssize_t ext4_attr_show(struct kobject *kobj,
2698 struct attribute *attr, char *buf)
2699{
2700 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2701 s_kobj);
2702 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2703
2704 return a->show ? a->show(a, sbi, buf) : 0;
2705}
2706
2707static ssize_t ext4_attr_store(struct kobject *kobj,
2708 struct attribute *attr,
2709 const char *buf, size_t len)
2710{
2711 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2712 s_kobj);
2713 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2714
2715 return a->store ? a->store(a, sbi, buf, len) : 0;
2716}
2717
2718static void ext4_sb_release(struct kobject *kobj)
2719{
2720 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2721 s_kobj);
2722 complete(&sbi->s_kobj_unregister);
2723}
2724
52cf25d0 2725static const struct sysfs_ops ext4_attr_ops = {
3197ebdb
TT		 2726 .show = ext4_attr_show,
2727 .store = ext4_attr_store,
2728};
2729
2730static struct kobj_type ext4_ktype = {
2731 .default_attrs = ext4_attrs,
2732 .sysfs_ops = &ext4_attr_ops,
2733 .release = ext4_sb_release,
2734};
2735
857ac889
LC		 2736static void ext4_feat_release(struct kobject *kobj)
2737{
2738 complete(&ext4_feat->f_kobj_unregister);
2739}
2740
c7f72543
LC		 2741static ssize_t ext4_feat_show(struct kobject *kobj,
2742 struct attribute *attr, char *buf)
2743{
2744 return snprintf(buf, PAGE_SIZE, "supported\n");
2745}
2746
2747/*
2748 * We can not use ext4_attr_show/store because it relies on the kobject
2749 * being embedded in the ext4_sb_info structure which is definitely not
2750 * true in this case.
2751 */
2752static const struct sysfs_ops ext4_feat_ops = {
2753 .show = ext4_feat_show,
2754 .store = NULL,
2755};
2756
857ac889
LC		 2757static struct kobj_type ext4_feat_ktype = {
2758 .default_attrs = ext4_feat_attrs,
c7f72543 2759 .sysfs_ops = &ext4_feat_ops,
857ac889
LC		 2760 .release = ext4_feat_release,
2761};
2762
a13fb1a4
ES		 2763/*
2764 * Check whether this filesystem can be mounted based on
2765 * the features present and the RDONLY/RDWR mount requested.
2766 * Returns 1 if this filesystem can be mounted as requested,
2767 * 0 if it cannot be.
2768 */
2769static int ext4_feature_set_ok(struct super_block *sb, int readonly)
2770{
2771 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP)) {
2772 ext4_msg(sb, KERN_ERR,
2773 "Couldn't mount because of "
2774 "unsupported optional features (%x)",
2775 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
2776 ~EXT4_FEATURE_INCOMPAT_SUPP));
2777 return 0;
2778 }
2779
2780 if (readonly)
2781 return 1;
2782
2cb5cc8b
DW		 2783 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_READONLY)) {
2784 ext4_msg(sb, KERN_INFO, "filesystem is read-only");
2785 sb->s_flags |= MS_RDONLY;
2786 return 1;
2787 }
2788
a13fb1a4
ES		 2789 /* Check that feature set is OK for a read-write mount */
2790 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP)) {
2791 ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of "
2792 "unsupported optional features (%x)",
2793 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
2794 ~EXT4_FEATURE_RO_COMPAT_SUPP));
2795 return 0;
2796 }
2797 /*
2798 * Large file size enabled file system can only be mounted
2799 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
2800 */
2801 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) {
2802 if (sizeof(blkcnt_t) < sizeof(u64)) {
2803 ext4_msg(sb, KERN_ERR, "Filesystem with huge files "
2804 "cannot be mounted RDWR without "
2805 "CONFIG_LBDAF");
2806 return 0;
2807 }
2808 }
bab08ab9
TT		 2809 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_BIGALLOC) &&
2810 !EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS)) {
2811 ext4_msg(sb, KERN_ERR,
2812 "Can't support bigalloc feature without "
2813 "extents feature\n");
2814 return 0;
2815 }
7c319d32
AK		 2816
2817#ifndef CONFIG_QUOTA
2818 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) &&
2819 !readonly) {
2820 ext4_msg(sb, KERN_ERR,
2821 "Filesystem with quota feature cannot be mounted RDWR "
2822 "without CONFIG_QUOTA");
2823 return 0;
2824 }
2825#endif /* CONFIG_QUOTA */
a13fb1a4
ES		 2826 return 1;
2827}
2828
66e61a9e
TT		 2829/*
2830 * This function is called once a day if we have errors logged
2831 * on the file system
2832 */
2833static void print_daily_error_info(unsigned long arg)
2834{
2835 struct super_block *sb = (struct super_block *) arg;
2836 struct ext4_sb_info *sbi;
2837 struct ext4_super_block *es;
2838
2839 sbi = EXT4_SB(sb);
2840 es = sbi->s_es;
2841
2842 if (es->s_error_count)
ae0f78de
TT		 2843 /* fsck newer than v1.41.13 is needed to clean this condition. */
2844 ext4_msg(sb, KERN_NOTICE, "error count since last fsck: %u",
66e61a9e
TT		 2845 le32_to_cpu(es->s_error_count));
2846 if (es->s_first_error_time) {
ae0f78de 2847 printk(KERN_NOTICE "EXT4-fs (%s): initial error at time %u: %.*s:%d",
66e61a9e
TT		 2848 sb->s_id, le32_to_cpu(es->s_first_error_time),
2849 (int) sizeof(es->s_first_error_func),
2850 es->s_first_error_func,
2851 le32_to_cpu(es->s_first_error_line));
2852 if (es->s_first_error_ino)
2853 printk(": inode %u",
2854 le32_to_cpu(es->s_first_error_ino));
2855 if (es->s_first_error_block)
2856 printk(": block %llu", (unsigned long long)
2857 le64_to_cpu(es->s_first_error_block));
2858 printk("\n");
2859 }
2860 if (es->s_last_error_time) {
ae0f78de 2861 printk(KERN_NOTICE "EXT4-fs (%s): last error at time %u: %.*s:%d",
66e61a9e
TT		 2862 sb->s_id, le32_to_cpu(es->s_last_error_time),
2863 (int) sizeof(es->s_last_error_func),
2864 es->s_last_error_func,
2865 le32_to_cpu(es->s_last_error_line));
2866 if (es->s_last_error_ino)
2867 printk(": inode %u",
2868 le32_to_cpu(es->s_last_error_ino));
2869 if (es->s_last_error_block)
2870 printk(": block %llu", (unsigned long long)
2871 le64_to_cpu(es->s_last_error_block));
2872 printk("\n");
2873 }
2874 mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ); /* Once a day */
2875}
2876
bfff6873
LC		 2877/* Find next suitable group and run ext4_init_inode_table */
2878static int ext4_run_li_request(struct ext4_li_request *elr)
2879{
2880 struct ext4_group_desc *gdp = NULL;
2881 ext4_group_t group, ngroups;
2882 struct super_block *sb;
2883 unsigned long timeout = 0;
2884 int ret = 0;
2885
2886 sb = elr->lr_super;
2887 ngroups = EXT4_SB(sb)->s_groups_count;
2888
8e8ad8a5 2889 sb_start_write(sb);
bfff6873
LC		 2890 for (group = elr->lr_next_group; group < ngroups; group++) {
2891 gdp = ext4_get_group_desc(sb, group, NULL);
2892 if (!gdp) {
2893 ret = 1;
2894 break;
2895 }
2896
2897 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2898 break;
2899 }
2900
7f511862 2901 if (group >= ngroups)
bfff6873
LC		 2902 ret = 1;
2903
2904 if (!ret) {
2905 timeout = jiffies;
2906 ret = ext4_init_inode_table(sb, group,
2907 elr->lr_timeout ? 0 : 1);
2908 if (elr->lr_timeout == 0) {
51ce6511
LC		 2909 timeout = (jiffies - timeout) *
2910 elr->lr_sbi->s_li_wait_mult;
bfff6873
LC		 2911 elr->lr_timeout = timeout;
2912 }
2913 elr->lr_next_sched = jiffies + elr->lr_timeout;
2914 elr->lr_next_group = group + 1;
2915 }
8e8ad8a5 2916 sb_end_write(sb);
bfff6873
LC		 2917
2918 return ret;
2919}
2920
2921/*
2922 * Remove lr_request from the list_request and free the
4ed5c033 2923 * request structure. Should be called with li_list_mtx held
bfff6873
LC		 2924 */
2925static void ext4_remove_li_request(struct ext4_li_request *elr)
2926{
2927 struct ext4_sb_info *sbi;
2928
2929 if (!elr)
2930 return;
2931
2932 sbi = elr->lr_sbi;
2933
2934 list_del(&elr->lr_request);
2935 sbi->s_li_request = NULL;
2936 kfree(elr);
2937}
2938
2939static void ext4_unregister_li_request(struct super_block *sb)
2940{
1bb933fb
LC		 2941 mutex_lock(&ext4_li_mtx);
2942 if (!ext4_li_info) {
2943 mutex_unlock(&ext4_li_mtx);
bfff6873 2944 return;
1bb933fb 2945 }
bfff6873
LC		 2946
2947 mutex_lock(&ext4_li_info->li_list_mtx);
1bb933fb 2948 ext4_remove_li_request(EXT4_SB(sb)->s_li_request);
bfff6873 2949 mutex_unlock(&ext4_li_info->li_list_mtx);
1bb933fb 2950 mutex_unlock(&ext4_li_mtx);
bfff6873
LC		 2951}
2952
8f1f7453
ES		 2953static struct task_struct *ext4_lazyinit_task;
2954
bfff6873
LC		 2955/*
2956 * This is the function where ext4lazyinit thread lives. It walks
2957 * through the request list searching for next scheduled filesystem.
2958 * When such a fs is found, run the lazy initialization request
2959 * (ext4_rn_li_request) and keep track of the time spend in this
2960 * function. Based on that time we compute next schedule time of
2961 * the request. When walking through the list is complete, compute
2962 * next waking time and put itself into sleep.
2963 */
2964static int ext4_lazyinit_thread(void *arg)
2965{
2966 struct ext4_lazy_init *eli = (struct ext4_lazy_init *)arg;
2967 struct list_head *pos, *n;
2968 struct ext4_li_request *elr;
4ed5c033 2969 unsigned long next_wakeup, cur;
bfff6873
LC		 2970
2971 BUG_ON(NULL == eli);
2972
bfff6873
LC		 2973cont_thread:
2974 while (true) {
2975 next_wakeup = MAX_JIFFY_OFFSET;
2976
2977 mutex_lock(&eli->li_list_mtx);
2978 if (list_empty(&eli->li_request_list)) {
2979 mutex_unlock(&eli->li_list_mtx);
2980 goto exit_thread;
2981 }
2982
2983 list_for_each_safe(pos, n, &eli->li_request_list) {
2984 elr = list_entry(pos, struct ext4_li_request,
2985 lr_request);
2986
b2c78cd0
TT		 2987 if (time_after_eq(jiffies, elr->lr_next_sched)) {
2988 if (ext4_run_li_request(elr) != 0) {
2989 /* error, remove the lazy_init job */
2990 ext4_remove_li_request(elr);
2991 continue;
2992 }
bfff6873
LC		 2993 }
2994
2995 if (time_before(elr->lr_next_sched, next_wakeup))
2996 next_wakeup = elr->lr_next_sched;
2997 }
2998 mutex_unlock(&eli->li_list_mtx);
2999
a0acae0e 3000 try_to_freeze();
bfff6873 3001
4ed5c033
LC		 3002 cur = jiffies;
3003 if ((time_after_eq(cur, next_wakeup)) ||
f4245bd4 3004 (MAX_JIFFY_OFFSET == next_wakeup)) {
bfff6873
LC		 3005 cond_resched();
3006 continue;
3007 }
3008
4ed5c033
LC		 3009 schedule_timeout_interruptible(next_wakeup - cur);
3010
8f1f7453
ES		 3011 if (kthread_should_stop()) {
3012 ext4_clear_request_list();
3013 goto exit_thread;
3014 }
bfff6873
LC		 3015 }
3016
3017exit_thread:
3018 /*
3019 * It looks like the request list is empty, but we need
3020 * to check it under the li_list_mtx lock, to prevent any
3021 * additions into it, and of course we should lock ext4_li_mtx
3022 * to atomically free the list and ext4_li_info, because at
3023 * this point another ext4 filesystem could be registering
3024 * new one.
3025 */
3026 mutex_lock(&ext4_li_mtx);
3027 mutex_lock(&eli->li_list_mtx);
3028 if (!list_empty(&eli->li_request_list)) {
3029 mutex_unlock(&eli->li_list_mtx);
3030 mutex_unlock(&ext4_li_mtx);
3031 goto cont_thread;
3032 }
3033 mutex_unlock(&eli->li_list_mtx);
bfff6873
LC		 3034 kfree(ext4_li_info);
3035 ext4_li_info = NULL;
3036 mutex_unlock(&ext4_li_mtx);
3037
3038 return 0;
3039}
3040
3041static void ext4_clear_request_list(void)
3042{
3043 struct list_head *pos, *n;
3044 struct ext4_li_request *elr;
3045
3046 mutex_lock(&ext4_li_info->li_list_mtx);
bfff6873
LC		 3047 list_for_each_safe(pos, n, &ext4_li_info->li_request_list) {
3048 elr = list_entry(pos, struct ext4_li_request,
3049 lr_request);
3050 ext4_remove_li_request(elr);
3051 }
3052 mutex_unlock(&ext4_li_info->li_list_mtx);
3053}
3054
3055static int ext4_run_lazyinit_thread(void)
3056{
8f1f7453
ES		 3057 ext4_lazyinit_task = kthread_run(ext4_lazyinit_thread,
3058 ext4_li_info, "ext4lazyinit");
3059 if (IS_ERR(ext4_lazyinit_task)) {
3060 int err = PTR_ERR(ext4_lazyinit_task);
bfff6873 3061 ext4_clear_request_list();
bfff6873
LC		 3062 kfree(ext4_li_info);
3063 ext4_li_info = NULL;
92b97816 3064 printk(KERN_CRIT "EXT4-fs: error %d creating inode table "
bfff6873
LC		 3065 "initialization thread\n",
3066 err);
3067 return err;
3068 }
3069 ext4_li_info->li_state |= EXT4_LAZYINIT_RUNNING;
bfff6873
LC		 3070 return 0;
3071}
3072
3073/*
3074 * Check whether it make sense to run itable init. thread or not.
3075 * If there is at least one uninitialized inode table, return
3076 * corresponding group number, else the loop goes through all
3077 * groups and return total number of groups.
3078 */
3079static ext4_group_t ext4_has_uninit_itable(struct super_block *sb)
3080{
3081 ext4_group_t group, ngroups = EXT4_SB(sb)->s_groups_count;
3082 struct ext4_group_desc *gdp = NULL;
3083
3084 for (group = 0; group < ngroups; group++) {
3085 gdp = ext4_get_group_desc(sb, group, NULL);
3086 if (!gdp)
3087 continue;
3088
3089 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
3090 break;
3091 }
3092
3093 return group;
3094}
3095
3096static int ext4_li_info_new(void)
3097{
3098 struct ext4_lazy_init *eli = NULL;
3099
3100 eli = kzalloc(sizeof(*eli), GFP_KERNEL);
3101 if (!eli)
3102 return -ENOMEM;
3103
bfff6873
LC		 3104 INIT_LIST_HEAD(&eli->li_request_list);
3105 mutex_init(&eli->li_list_mtx);
3106
bfff6873
LC		 3107 eli->li_state |= EXT4_LAZYINIT_QUIT;
3108
3109 ext4_li_info = eli;
3110
3111 return 0;
3112}
3113
3114static struct ext4_li_request *ext4_li_request_new(struct super_block *sb,
3115 ext4_group_t start)
3116{
3117 struct ext4_sb_info *sbi = EXT4_SB(sb);
3118 struct ext4_li_request *elr;
bfff6873
LC		 3119
3120 elr = kzalloc(sizeof(*elr), GFP_KERNEL);
3121 if (!elr)
3122 return NULL;
3123
3124 elr->lr_super = sb;
3125 elr->lr_sbi = sbi;
3126 elr->lr_next_group = start;
3127
3128 /*
3129 * Randomize first schedule time of the request to
3130 * spread the inode table initialization requests
3131 * better.
3132 */
dd1f723b
TT		 3133 elr->lr_next_sched = jiffies + (prandom_u32() %
3134 (EXT4_DEF_LI_MAX_START_DELAY * HZ));
bfff6873
LC		 3135 return elr;
3136}
3137
7f511862
TT		 3138int ext4_register_li_request(struct super_block *sb,
3139 ext4_group_t first_not_zeroed)
bfff6873
LC		 3140{
3141 struct ext4_sb_info *sbi = EXT4_SB(sb);
7f511862 3142 struct ext4_li_request *elr = NULL;
bfff6873 3143 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
6c5a6cb9 3144 int ret = 0;
bfff6873 3145
7f511862 3146 mutex_lock(&ext4_li_mtx);
51ce6511
LC		 3147 if (sbi->s_li_request != NULL) {
3148 /*
3149 * Reset timeout so it can be computed again, because
3150 * s_li_wait_mult might have changed.
3151 */
3152 sbi->s_li_request->lr_timeout = 0;
7f511862 3153 goto out;
51ce6511 3154 }
bfff6873
LC		 3155
3156 if (first_not_zeroed == ngroups ||
3157 (sb->s_flags & MS_RDONLY) ||
55ff3840 3158 !test_opt(sb, INIT_INODE_TABLE))
7f511862 3159 goto out;
bfff6873
LC		 3160
3161 elr = ext4_li_request_new(sb, first_not_zeroed);
7f511862
TT		 3162 if (!elr) {
3163 ret = -ENOMEM;
3164 goto out;
3165 }
bfff6873
LC		 3166
3167 if (NULL == ext4_li_info) {
3168 ret = ext4_li_info_new();
3169 if (ret)
3170 goto out;
3171 }
3172
3173 mutex_lock(&ext4_li_info->li_list_mtx);
3174 list_add(&elr->lr_request, &ext4_li_info->li_request_list);
3175 mutex_unlock(&ext4_li_info->li_list_mtx);
3176
3177 sbi->s_li_request = elr;
46e4690b
TM		 3178 /*
3179 * set elr to NULL here since it has been inserted to
3180 * the request_list and the removal and free of it is
3181 * handled by ext4_clear_request_list from now on.
3182 */
3183 elr = NULL;
bfff6873
LC		 3184
3185 if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) {
3186 ret = ext4_run_lazyinit_thread();
3187 if (ret)
3188 goto out;
3189 }
bfff6873 3190out:
beed5ecb
NK		 3191 mutex_unlock(&ext4_li_mtx);
3192 if (ret)
bfff6873 3193 kfree(elr);
bfff6873
LC		 3194 return ret;
3195}
3196
3197/*
3198 * We do not need to lock anything since this is called on
3199 * module unload.
3200 */
3201static void ext4_destroy_lazyinit_thread(void)
3202{
3203 /*
3204 * If thread exited earlier
3205 * there's nothing to be done.
3206 */
8f1f7453 3207 if (!ext4_li_info || !ext4_lazyinit_task)
bfff6873
LC		 3208 return;
3209
8f1f7453 3210 kthread_stop(ext4_lazyinit_task);
bfff6873
LC		 3211}
3212
25ed6e8a
DW		 3213static int set_journal_csum_feature_set(struct super_block *sb)
3214{
3215 int ret = 1;
3216 int compat, incompat;
3217 struct ext4_sb_info *sbi = EXT4_SB(sb);
3218
9aa5d32b 3219 if (ext4_has_metadata_csum(sb)) {
db9ee220 3220 /* journal checksum v3 */
25ed6e8a 3221 compat = 0;
db9ee220 3222 incompat = JBD2_FEATURE_INCOMPAT_CSUM_V3;
25ed6e8a
DW		 3223 } else {
3224 /* journal checksum v1 */
3225 compat = JBD2_FEATURE_COMPAT_CHECKSUM;
3226 incompat = 0;
3227 }
3228
feb8c6d3
DW		 3229 jbd2_journal_clear_features(sbi->s_journal,
3230 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
3231 JBD2_FEATURE_INCOMPAT_CSUM_V3 |
3232 JBD2_FEATURE_INCOMPAT_CSUM_V2);
25ed6e8a
DW		 3233 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
3234 ret = jbd2_journal_set_features(sbi->s_journal,
3235 compat, 0,
3236 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT |
3237 incompat);
3238 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
3239 ret = jbd2_journal_set_features(sbi->s_journal,
3240 compat, 0,
3241 incompat);
3242 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
3243 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
3244 } else {
feb8c6d3
DW		 3245 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
3246 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
25ed6e8a
DW		 3247 }
3248
3249 return ret;
3250}
3251
952fc18e
TT		 3252/*
3253 * Note: calculating the overhead so we can be compatible with
3254 * historical BSD practice is quite difficult in the face of
3255 * clusters/bigalloc. This is because multiple metadata blocks from
3256 * different block group can end up in the same allocation cluster.
3257 * Calculating the exact overhead in the face of clustered allocation
3258 * requires either O(all block bitmaps) in memory or O(number of block
3259 * groups**2) in time. We will still calculate the superblock for
3260 * older file systems --- and if we come across with a bigalloc file
3261 * system with zero in s_overhead_clusters the estimate will be close to
3262 * correct especially for very large cluster sizes --- but for newer
3263 * file systems, it's better to calculate this figure once at mkfs
3264 * time, and store it in the superblock. If the superblock value is
3265 * present (even for non-bigalloc file systems), we will use it.
3266 */
3267static int count_overhead(struct super_block *sb, ext4_group_t grp,
3268 char *buf)
3269{
3270 struct ext4_sb_info *sbi = EXT4_SB(sb);
3271 struct ext4_group_desc *gdp;
3272 ext4_fsblk_t first_block, last_block, b;
3273 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3274 int s, j, count = 0;
3275
0548bbb8
TT		 3276 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_BIGALLOC))
3277 return (ext4_bg_has_super(sb, grp) + ext4_bg_num_gdb(sb, grp) +
3278 sbi->s_itb_per_group + 2);
3279
952fc18e
TT		 3280 first_block = le32_to_cpu(sbi->s_es->s_first_data_block) +
3281 (grp * EXT4_BLOCKS_PER_GROUP(sb));
3282 last_block = first_block + EXT4_BLOCKS_PER_GROUP(sb) - 1;
3283 for (i = 0; i < ngroups; i++) {
3284 gdp = ext4_get_group_desc(sb, i, NULL);
3285 b = ext4_block_bitmap(sb, gdp);
3286 if (b >= first_block && b <= last_block) {
3287 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3288 count++;
3289 }
3290 b = ext4_inode_bitmap(sb, gdp);
3291 if (b >= first_block && b <= last_block) {
3292 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3293 count++;
3294 }
3295 b = ext4_inode_table(sb, gdp);
3296 if (b >= first_block && b + sbi->s_itb_per_group <= last_block)
3297 for (j = 0; j < sbi->s_itb_per_group; j++, b++) {
3298 int c = EXT4_B2C(sbi, b - first_block);
3299 ext4_set_bit(c, buf);
3300 count++;
3301 }
3302 if (i != grp)
3303 continue;
3304 s = 0;
3305 if (ext4_bg_has_super(sb, grp)) {
3306 ext4_set_bit(s++, buf);
3307 count++;
3308 }
3309 for (j = ext4_bg_num_gdb(sb, grp); j > 0; j--) {
3310 ext4_set_bit(EXT4_B2C(sbi, s++), buf);
3311 count++;
3312 }
3313 }
3314 if (!count)
3315 return 0;
3316 return EXT4_CLUSTERS_PER_GROUP(sb) -
3317 ext4_count_free(buf, EXT4_CLUSTERS_PER_GROUP(sb) / 8);
3318}
3319
3320/*
3321 * Compute the overhead and stash it in sbi->s_overhead
3322 */
3323int ext4_calculate_overhead(struct super_block *sb)
3324{
3325 struct ext4_sb_info *sbi = EXT4_SB(sb);
3326 struct ext4_super_block *es = sbi->s_es;
3327 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3328 ext4_fsblk_t overhead = 0;
4fdb5543 3329 char *buf = (char *) get_zeroed_page(GFP_NOFS);
952fc18e 3330
952fc18e
TT		 3331 if (!buf)
3332 return -ENOMEM;
3333
3334 /*
3335 * Compute the overhead (FS structures). This is constant
3336 * for a given filesystem unless the number of block groups
3337 * changes so we cache the previous value until it does.
3338 */
3339
3340 /*
3341 * All of the blocks before first_data_block are overhead
3342 */
3343 overhead = EXT4_B2C(sbi, le32_to_cpu(es->s_first_data_block));
3344
3345 /*
3346 * Add the overhead found in each block group
3347 */
3348 for (i = 0; i < ngroups; i++) {
3349 int blks;
3350
3351 blks = count_overhead(sb, i, buf);
3352 overhead += blks;
3353 if (blks)
3354 memset(buf, 0, PAGE_SIZE);
3355 cond_resched();
3356 }
b003b524
ES		 3357 /* Add the internal journal blocks as well */
3358 if (sbi->s_journal && !sbi->journal_bdev)
810da240 3359 overhead += EXT4_NUM_B2C(sbi, sbi->s_journal->j_maxlen);
0875a2b4 3360
952fc18e
TT		 3361 sbi->s_overhead = overhead;
3362 smp_wmb();
3363 free_page((unsigned long) buf);
3364 return 0;
3365}
3366
27dd4385 3367
30fac0f7 3368static ext4_fsblk_t ext4_calculate_resv_clusters(struct super_block *sb)
27dd4385
LC		 3369{
3370 ext4_fsblk_t resv_clusters;
3371
30fac0f7
JK		 3372 /*
3373 * There's no need to reserve anything when we aren't using extents.
3374 * The space estimates are exact, there are no unwritten extents,
3375 * hole punching doesn't need new metadata... This is needed especially
3376 * to keep ext2/3 backward compatibility.
3377 */
3378 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS))
3379 return 0;
27dd4385
LC		 3380 /*
3381 * By default we reserve 2% or 4096 clusters, whichever is smaller.
3382 * This should cover the situations where we can not afford to run
3383 * out of space like for example punch hole, or converting
556615dc 3384 * unwritten extents in delalloc path. In most cases such
27dd4385
LC		 3385 * allocation would require 1, or 2 blocks, higher numbers are
3386 * very rare.
3387 */
30fac0f7
JK		 3388 resv_clusters = ext4_blocks_count(EXT4_SB(sb)->s_es) >>
3389 EXT4_SB(sb)->s_cluster_bits;
27dd4385
LC		 3390
3391 do_div(resv_clusters, 50);
3392 resv_clusters = min_t(ext4_fsblk_t, resv_clusters, 4096);
3393
3394 return resv_clusters;
3395}
3396
3397
3398static int ext4_reserve_clusters(struct ext4_sb_info *sbi, ext4_fsblk_t count)
3399{
3400 ext4_fsblk_t clusters = ext4_blocks_count(sbi->s_es) >>
3401 sbi->s_cluster_bits;
3402
3403 if (count >= clusters)
3404 return -EINVAL;
3405
3406 atomic64_set(&sbi->s_resv_clusters, count);
3407 return 0;
3408}
3409
2b2d6d01 3410static int ext4_fill_super(struct super_block *sb, void *data, int silent)
ac27a0ec 3411{
d4c402d9 3412 char *orig_data = kstrdup(data, GFP_KERNEL);
2b2d6d01 3413 struct buffer_head *bh;
617ba13b
MC		 3414 struct ext4_super_block *es = NULL;
3415 struct ext4_sb_info *sbi;
3416 ext4_fsblk_t block;
3417 ext4_fsblk_t sb_block = get_sb_block(&data);
70bbb3e0 3418 ext4_fsblk_t logical_sb_block;
ac27a0ec 3419 unsigned long offset = 0;
ac27a0ec
DK		 3420 unsigned long journal_devnum = 0;
3421 unsigned long def_mount_opts;
3422 struct inode *root;
9f6200bb 3423 char *cp;
0390131b 3424 const char *descr;
dcc7dae3 3425 int ret = -ENOMEM;
281b5995 3426 int blocksize, clustersize;
4ec11028
TT		 3427 unsigned int db_count;
3428 unsigned int i;
281b5995 3429 int needs_recovery, has_huge_files, has_bigalloc;
bd81d8ee 3430 __u64 blocks_count;
07aa2ea1 3431 int err = 0;
b3881f74 3432 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
bfff6873 3433 ext4_group_t first_not_zeroed;
ac27a0ec
DK		 3434
3435 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
3436 if (!sbi)
dcc7dae3 3437 goto out_free_orig;
705895b6
PE		 3438
3439 sbi->s_blockgroup_lock =
3440 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
3441 if (!sbi->s_blockgroup_lock) {
3442 kfree(sbi);
dcc7dae3 3443 goto out_free_orig;
705895b6 3444 }
ac27a0ec 3445 sb->s_fs_info = sbi;
2c0544b2 3446 sbi->s_sb = sb;
240799cd 3447 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
d9c9bef1 3448 sbi->s_sb_block = sb_block;
f613dfcb
TT		 3449 if (sb->s_bdev->bd_part)
3450 sbi->s_sectors_written_start =
3451 part_stat_read(sb->s_bdev->bd_part, sectors[1]);
b30ab0e0
MH		 3452#ifdef CONFIG_EXT4_FS_ENCRYPTION
3453 /* Modes of operations for file and directory encryption. */
3454 sbi->s_file_encryption_mode = EXT4_ENCRYPTION_MODE_AES_256_XTS;
3455 sbi->s_dir_encryption_mode = EXT4_ENCRYPTION_MODE_INVALID;
3456#endif
ac27a0ec 3457
9f6200bb
TT		 3458 /* Cleanup superblock name */
3459 for (cp = sb->s_id; (cp = strchr(cp, '/'));)
3460 *cp = '!';
3461
07aa2ea1 3462 /* -EINVAL is default */
dcc7dae3 3463 ret = -EINVAL;
617ba13b 3464 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
ac27a0ec 3465 if (!blocksize) {
b31e1552 3466 ext4_msg(sb, KERN_ERR, "unable to set blocksize");
ac27a0ec
DK		 3467 goto out_fail;
3468 }
3469
3470 /*
617ba13b 3471 * The ext4 superblock will not be buffer aligned for other than 1kB
ac27a0ec
DK		 3472 * block sizes. We need to calculate the offset from buffer start.
3473 */
617ba13b 3474 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
70bbb3e0
AM		 3475 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3476 offset = do_div(logical_sb_block, blocksize);
ac27a0ec 3477 } else {
70bbb3e0 3478 logical_sb_block = sb_block;
ac27a0ec
DK		 3479 }
3480
a8ac900b 3481 if (!(bh = sb_bread_unmovable(sb, logical_sb_block))) {
b31e1552 3482 ext4_msg(sb, KERN_ERR, "unable to read superblock");
ac27a0ec
DK		 3483 goto out_fail;
3484 }
3485 /*
3486 * Note: s_es must be initialized as soon as possible because
617ba13b 3487 * some ext4 macro-instructions depend on its value
ac27a0ec 3488 */
2716b802 3489 es = (struct ext4_super_block *) (bh->b_data + offset);
ac27a0ec
DK		 3490 sbi->s_es = es;
3491 sb->s_magic = le16_to_cpu(es->s_magic);
617ba13b
MC		 3492 if (sb->s_magic != EXT4_SUPER_MAGIC)
3493 goto cantfind_ext4;
afc32f7e 3494 sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
ac27a0ec 3495
feb0ab32
DW		 3496 /* Warn if metadata_csum and gdt_csum are both set. */
3497 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3498 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) &&
3499 EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_GDT_CSUM))
363307e6 3500 ext4_warning(sb, "metadata_csum and uninit_bg are "
feb0ab32
DW		 3501 "redundant flags; please run fsck.");
3502
d25425f8
DW		 3503 /* Check for a known checksum algorithm */
3504 if (!ext4_verify_csum_type(sb, es)) {
3505 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3506 "unknown checksum algorithm.");
3507 silent = 1;
3508 goto cantfind_ext4;
3509 }
3510
0441984a
DW		 3511 /* Load the checksum driver */
3512 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3513 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) {
3514 sbi->s_chksum_driver = crypto_alloc_shash("crc32c", 0, 0);
3515 if (IS_ERR(sbi->s_chksum_driver)) {
3516 ext4_msg(sb, KERN_ERR, "Cannot load crc32c driver.");
3517 ret = PTR_ERR(sbi->s_chksum_driver);
3518 sbi->s_chksum_driver = NULL;
3519 goto failed_mount;
3520 }
3521 }
3522
a9c47317
DW		 3523 /* Check superblock checksum */
3524 if (!ext4_superblock_csum_verify(sb, es)) {
3525 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3526 "invalid superblock checksum. Run e2fsck?");
3527 silent = 1;
3528 goto cantfind_ext4;
3529 }
3530
3531 /* Precompute checksum seed for all metadata */
9aa5d32b 3532 if (ext4_has_metadata_csum(sb))
a9c47317
DW		 3533 sbi->s_csum_seed = ext4_chksum(sbi, ~0, es->s_uuid,
3534 sizeof(es->s_uuid));
3535
ac27a0ec
DK		 3536 /* Set defaults before we parse the mount options */
3537 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
fd8c37ec 3538 set_opt(sb, INIT_INODE_TABLE);
617ba13b 3539 if (def_mount_opts & EXT4_DEFM_DEBUG)
fd8c37ec 3540 set_opt(sb, DEBUG);
87f26807 3541 if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
fd8c37ec 3542 set_opt(sb, GRPID);
617ba13b 3543 if (def_mount_opts & EXT4_DEFM_UID16)
fd8c37ec 3544 set_opt(sb, NO_UID32);
ea663336 3545 /* xattr user namespace & acls are now defaulted on */
ea663336 3546 set_opt(sb, XATTR_USER);
03010a33 3547#ifdef CONFIG_EXT4_FS_POSIX_ACL
ea663336 3548 set_opt(sb, POSIX_ACL);
2e7842b8 3549#endif
98c1a759
DW		 3550 /* don't forget to enable journal_csum when metadata_csum is enabled. */
3551 if (ext4_has_metadata_csum(sb))
3552 set_opt(sb, JOURNAL_CHECKSUM);
3553
617ba13b 3554 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
fd8c37ec 3555 set_opt(sb, JOURNAL_DATA);
617ba13b 3556 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
fd8c37ec 3557 set_opt(sb, ORDERED_DATA);
617ba13b 3558 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
fd8c37ec 3559 set_opt(sb, WRITEBACK_DATA);
617ba13b
MC		 3560
3561 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
fd8c37ec 3562 set_opt(sb, ERRORS_PANIC);
bb4f397a 3563 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
fd8c37ec 3564 set_opt(sb, ERRORS_CONT);
bb4f397a 3565 else
fd8c37ec 3566 set_opt(sb, ERRORS_RO);
45f1a9c3
DW		 3567 /* block_validity enabled by default; disable with noblock_validity */
3568 set_opt(sb, BLOCK_VALIDITY);
8b67f04a 3569 if (def_mount_opts & EXT4_DEFM_DISCARD)
fd8c37ec 3570 set_opt(sb, DISCARD);
ac27a0ec 3571
08cefc7a
EB		 3572 sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));
3573 sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid));
30773840
TT		 3574 sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
3575 sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
3576 sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
ac27a0ec 3577
8b67f04a 3578 if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0)
fd8c37ec 3579 set_opt(sb, BARRIER);
ac27a0ec 3580
dd919b98
AK		 3581 /*
3582 * enable delayed allocation by default
3583 * Use -o nodelalloc to turn it off
3584 */
bc0b75f7 3585 if (!IS_EXT3_SB(sb) && !IS_EXT2_SB(sb) &&
8b67f04a 3586 ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0))
fd8c37ec 3587 set_opt(sb, DELALLOC);
dd919b98 3588
51ce6511
LC		 3589 /*
3590 * set default s_li_wait_mult for lazyinit, for the case there is
3591 * no mount option specified.
3592 */
3593 sbi->s_li_wait_mult = EXT4_DEF_LI_WAIT_MULT;
3594
8b67f04a 3595 if (!parse_options((char *) sbi->s_es->s_mount_opts, sb,
661aa520 3596 &journal_devnum, &journal_ioprio, 0)) {
8b67f04a
TT		 3597 ext4_msg(sb, KERN_WARNING,
3598 "failed to parse options in superblock: %s",
3599 sbi->s_es->s_mount_opts);
3600 }
5a916be1 3601 sbi->s_def_mount_opt = sbi->s_mount_opt;
b3881f74 3602 if (!parse_options((char *) data, sb, &journal_devnum,
661aa520 3603 &journal_ioprio, 0))
ac27a0ec
DK		 3604 goto failed_mount;
3605
56889787
TT		 3606 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
3607 printk_once(KERN_WARNING "EXT4-fs: Warning: mounting "
3608 "with data=journal disables delayed "
3609 "allocation and O_DIRECT support!\n");
3610 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
3611 ext4_msg(sb, KERN_ERR, "can't mount with "
3612 "both data=journal and delalloc");
3613 goto failed_mount;
3614 }
3615 if (test_opt(sb, DIOREAD_NOLOCK)) {
3616 ext4_msg(sb, KERN_ERR, "can't mount with "
6ae6514b 3617 "both data=journal and dioread_nolock");
56889787
TT		 3618 goto failed_mount;
3619 }
923ae0ff
RZ		 3620 if (test_opt(sb, DAX)) {
3621 ext4_msg(sb, KERN_ERR, "can't mount with "
3622 "both data=journal and dax");
3623 goto failed_mount;
3624 }
56889787
TT		 3625 if (test_opt(sb, DELALLOC))
3626 clear_opt(sb, DELALLOC);
3627 }
3628
ac27a0ec 3629 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
482a7425 3630 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec 3631
617ba13b
MC		 3632 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
3633 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
3634 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
3635 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
b31e1552
ES		 3636 ext4_msg(sb, KERN_WARNING,
3637 "feature flags set on rev 0 fs, "
3638 "running e2fsck is recommended");
469108ff 3639
ed3654eb
TT		 3640 if (es->s_creator_os == cpu_to_le32(EXT4_OS_HURD)) {
3641 set_opt2(sb, HURD_COMPAT);
3642 if (EXT4_HAS_INCOMPAT_FEATURE(sb,
3643 EXT4_FEATURE_INCOMPAT_64BIT)) {
3644 ext4_msg(sb, KERN_ERR,
3645 "The Hurd can't support 64-bit file systems");
3646 goto failed_mount;
3647 }
3648 }
3649
2035e776
TT		 3650 if (IS_EXT2_SB(sb)) {
3651 if (ext2_feature_set_ok(sb))
3652 ext4_msg(sb, KERN_INFO, "mounting ext2 file system "
3653 "using the ext4 subsystem");
3654 else {
3655 ext4_msg(sb, KERN_ERR, "couldn't mount as ext2 due "
3656 "to feature incompatibilities");
3657 goto failed_mount;
3658 }
3659 }
3660
3661 if (IS_EXT3_SB(sb)) {
3662 if (ext3_feature_set_ok(sb))
3663 ext4_msg(sb, KERN_INFO, "mounting ext3 file system "
3664 "using the ext4 subsystem");
3665 else {
3666 ext4_msg(sb, KERN_ERR, "couldn't mount as ext3 due "
3667 "to feature incompatibilities");
3668 goto failed_mount;
3669 }
3670 }
3671
ac27a0ec
DK		 3672 /*
3673 * Check feature flags regardless of the revision level, since we
3674 * previously didn't change the revision level when setting the flags,
3675 * so there is a chance incompat flags are set on a rev 0 filesystem.
3676 */
a13fb1a4 3677 if (!ext4_feature_set_ok(sb, (sb->s_flags & MS_RDONLY)))
ac27a0ec 3678 goto failed_mount;
a13fb1a4 3679
261cb20c 3680 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
617ba13b
MC		 3681 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
3682 blocksize > EXT4_MAX_BLOCK_SIZE) {
b31e1552
ES		 3683 ext4_msg(sb, KERN_ERR,
3684 "Unsupported filesystem blocksize %d", blocksize);
ac27a0ec
DK		 3685 goto failed_mount;
3686 }
3687
923ae0ff
RZ		 3688 if (sbi->s_mount_opt & EXT4_MOUNT_DAX) {
3689 if (blocksize != PAGE_SIZE) {
3690 ext4_msg(sb, KERN_ERR,
3691 "error: unsupported blocksize for dax");
3692 goto failed_mount;
3693 }
3694 if (!sb->s_bdev->bd_disk->fops->direct_access) {
3695 ext4_msg(sb, KERN_ERR,
3696 "error: device does not support dax");
3697 goto failed_mount;
3698 }
3699 }
3700
6ddb2447
TT		 3701 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_ENCRYPT) &&
3702 es->s_encryption_level) {
3703 ext4_msg(sb, KERN_ERR, "Unsupported encryption level %d",
3704 es->s_encryption_level);
3705 goto failed_mount;
3706 }
3707
ac27a0ec 3708 if (sb->s_blocksize != blocksize) {
ce40733c
AK		 3709 /* Validate the filesystem blocksize */
3710 if (!sb_set_blocksize(sb, blocksize)) {
b31e1552 3711 ext4_msg(sb, KERN_ERR, "bad block size %d",
ce40733c 3712 blocksize);
ac27a0ec
DK		 3713 goto failed_mount;
3714 }
3715
2b2d6d01 3716 brelse(bh);
70bbb3e0
AM		 3717 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3718 offset = do_div(logical_sb_block, blocksize);
a8ac900b 3719 bh = sb_bread_unmovable(sb, logical_sb_block);
ac27a0ec 3720 if (!bh) {
b31e1552
ES		 3721 ext4_msg(sb, KERN_ERR,
3722 "Can't read superblock on 2nd try");
ac27a0ec
DK		 3723 goto failed_mount;
3724 }
2716b802 3725 es = (struct ext4_super_block *)(bh->b_data + offset);
ac27a0ec 3726 sbi->s_es = es;
617ba13b 3727 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
b31e1552
ES		 3728 ext4_msg(sb, KERN_ERR,
3729 "Magic mismatch, very weird!");
ac27a0ec
DK		 3730 goto failed_mount;
3731 }
3732 }
3733
a13fb1a4
ES		 3734 has_huge_files = EXT4_HAS_RO_COMPAT_FEATURE(sb,
3735 EXT4_FEATURE_RO_COMPAT_HUGE_FILE);
f287a1a5
TT		 3736 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
3737 has_huge_files);
3738 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
ac27a0ec 3739
617ba13b
MC		 3740 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
3741 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
3742 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
ac27a0ec
DK		 3743 } else {
3744 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
3745 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
617ba13b 3746 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
1330593e 3747 (!is_power_of_2(sbi->s_inode_size)) ||
ac27a0ec 3748 (sbi->s_inode_size > blocksize)) {
b31e1552
ES		 3749 ext4_msg(sb, KERN_ERR,
3750 "unsupported inode size: %d",
2b2d6d01 3751 sbi->s_inode_size);
ac27a0ec
DK		 3752 goto failed_mount;
3753 }
ef7f3835
KS		 3754 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
3755 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
ac27a0ec 3756 }
0b8e58a1 3757
0d1ee42f
AR		 3758 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
3759 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
8fadc143 3760 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
0d1ee42f 3761 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
d8ea6cf8 3762 !is_power_of_2(sbi->s_desc_size)) {
b31e1552
ES		 3763 ext4_msg(sb, KERN_ERR,
3764 "unsupported descriptor size %lu",
0d1ee42f
AR		 3765 sbi->s_desc_size);
3766 goto failed_mount;
3767 }
3768 } else
3769 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
0b8e58a1 3770
ac27a0ec 3771 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
ac27a0ec 3772 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
b47b6f38 3773 if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
617ba13b 3774 goto cantfind_ext4;
0b8e58a1 3775
617ba13b 3776 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
ac27a0ec 3777 if (sbi->s_inodes_per_block == 0)
617ba13b 3778 goto cantfind_ext4;
ac27a0ec
DK		 3779 sbi->s_itb_per_group = sbi->s_inodes_per_group /
3780 sbi->s_inodes_per_block;
0d1ee42f 3781 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
ac27a0ec
DK		 3782 sbi->s_sbh = bh;
3783 sbi->s_mount_state = le16_to_cpu(es->s_state);
e57aa839
FW		 3784 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
3785 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
0b8e58a1 3786
2b2d6d01 3787 for (i = 0; i < 4; i++)
ac27a0ec
DK		 3788 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
3789 sbi->s_def_hash_version = es->s_def_hash_version;
23301410
TT		 3790 if (EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_DIR_INDEX)) {
3791 i = le32_to_cpu(es->s_flags);
3792 if (i & EXT2_FLAGS_UNSIGNED_HASH)
3793 sbi->s_hash_unsigned = 3;
3794 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
f99b2589 3795#ifdef __CHAR_UNSIGNED__
23301410
TT		 3796 if (!(sb->s_flags & MS_RDONLY))
3797 es->s_flags |=
3798 cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
3799 sbi->s_hash_unsigned = 3;
f99b2589 3800#else
23301410
TT		 3801 if (!(sb->s_flags & MS_RDONLY))
3802 es->s_flags |=
3803 cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
f99b2589 3804#endif
23301410 3805 }
f99b2589 3806 }
ac27a0ec 3807
281b5995
TT		 3808 /* Handle clustersize */
3809 clustersize = BLOCK_SIZE << le32_to_cpu(es->s_log_cluster_size);
3810 has_bigalloc = EXT4_HAS_RO_COMPAT_FEATURE(sb,
3811 EXT4_FEATURE_RO_COMPAT_BIGALLOC);
3812 if (has_bigalloc) {
3813 if (clustersize < blocksize) {
3814 ext4_msg(sb, KERN_ERR,
3815 "cluster size (%d) smaller than "
3816 "block size (%d)", clustersize, blocksize);
3817 goto failed_mount;
3818 }
3819 sbi->s_cluster_bits = le32_to_cpu(es->s_log_cluster_size) -
3820 le32_to_cpu(es->s_log_block_size);
3821 sbi->s_clusters_per_group =
3822 le32_to_cpu(es->s_clusters_per_group);
3823 if (sbi->s_clusters_per_group > blocksize * 8) {
3824 ext4_msg(sb, KERN_ERR,
3825 "#clusters per group too big: %lu",
3826 sbi->s_clusters_per_group);
3827 goto failed_mount;
3828 }
3829 if (sbi->s_blocks_per_group !=
3830 (sbi->s_clusters_per_group * (clustersize / blocksize))) {
3831 ext4_msg(sb, KERN_ERR, "blocks per group (%lu) and "
3832 "clusters per group (%lu) inconsistent",
3833 sbi->s_blocks_per_group,
3834 sbi->s_clusters_per_group);
3835 goto failed_mount;
3836 }
3837 } else {
3838 if (clustersize != blocksize) {
3839 ext4_warning(sb, "fragment/cluster size (%d) != "
3840 "block size (%d)", clustersize,
3841 blocksize);
3842 clustersize = blocksize;
3843 }
3844 if (sbi->s_blocks_per_group > blocksize * 8) {
3845 ext4_msg(sb, KERN_ERR,
3846 "#blocks per group too big: %lu",
3847 sbi->s_blocks_per_group);
3848 goto failed_mount;
3849 }
3850 sbi->s_clusters_per_group = sbi->s_blocks_per_group;
3851 sbi->s_cluster_bits = 0;
ac27a0ec 3852 }
281b5995
TT		 3853 sbi->s_cluster_ratio = clustersize / blocksize;
3854
ac27a0ec 3855 if (sbi->s_inodes_per_group > blocksize * 8) {
b31e1552
ES		 3856 ext4_msg(sb, KERN_ERR,
3857 "#inodes per group too big: %lu",
2b2d6d01 3858 sbi->s_inodes_per_group);
ac27a0ec
DK		 3859 goto failed_mount;
3860 }
3861
960fd856
TT		 3862 /* Do we have standard group size of clustersize * 8 blocks ? */
3863 if (sbi->s_blocks_per_group == clustersize << 3)
3864 set_opt2(sb, STD_GROUP_SIZE);
3865
bf43d84b
ES		 3866 /*
3867 * Test whether we have more sectors than will fit in sector_t,
3868 * and whether the max offset is addressable by the page cache.
3869 */
5a9ae68a 3870 err = generic_check_addressable(sb->s_blocksize_bits,
30ca22c7 3871 ext4_blocks_count(es));
5a9ae68a 3872 if (err) {
b31e1552 3873 ext4_msg(sb, KERN_ERR, "filesystem"
bf43d84b 3874 " too large to mount safely on this system");
ac27a0ec 3875 if (sizeof(sector_t) < 8)
90c699a9 3876 ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled");
ac27a0ec
DK		 3877 goto failed_mount;
3878 }
3879
617ba13b
MC		 3880 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
3881 goto cantfind_ext4;
e7c95593 3882
0f2ddca6
FTN		 3883 /* check blocks count against device size */
3884 blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
3885 if (blocks_count && ext4_blocks_count(es) > blocks_count) {
b31e1552
ES		 3886 ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
3887 "exceeds size of device (%llu blocks)",
0f2ddca6
FTN		 3888 ext4_blocks_count(es), blocks_count);
3889 goto failed_mount;
3890 }
3891
0b8e58a1
AD		 3892 /*
3893 * It makes no sense for the first data block to be beyond the end
3894 * of the filesystem.
3895 */
3896 if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
5635a62b 3897 ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
b31e1552
ES		 3898 "block %u is beyond end of filesystem (%llu)",
3899 le32_to_cpu(es->s_first_data_block),
3900 ext4_blocks_count(es));
e7c95593
ES		 3901 goto failed_mount;
3902 }
bd81d8ee
LV		 3903 blocks_count = (ext4_blocks_count(es) -
3904 le32_to_cpu(es->s_first_data_block) +
3905 EXT4_BLOCKS_PER_GROUP(sb) - 1);
3906 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
4ec11028 3907 if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
b31e1552 3908 ext4_msg(sb, KERN_WARNING, "groups count too large: %u "
4ec11028 3909 "(block count %llu, first data block %u, "
b31e1552 3910 "blocks per group %lu)", sbi->s_groups_count,
4ec11028
TT		 3911 ext4_blocks_count(es),
3912 le32_to_cpu(es->s_first_data_block),
3913 EXT4_BLOCKS_PER_GROUP(sb));
3914 goto failed_mount;
3915 }
bd81d8ee 3916 sbi->s_groups_count = blocks_count;
fb0a387d
ES		 3917 sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
3918 (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
617ba13b
MC		 3919 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
3920 EXT4_DESC_PER_BLOCK(sb);
f18a5f21
TT		 3921 sbi->s_group_desc = ext4_kvmalloc(db_count *
3922 sizeof(struct buffer_head *),
3923 GFP_KERNEL);
ac27a0ec 3924 if (sbi->s_group_desc == NULL) {
b31e1552 3925 ext4_msg(sb, KERN_ERR, "not enough memory");
2cde417d 3926 ret = -ENOMEM;
ac27a0ec
DK		 3927 goto failed_mount;
3928 }
3929
9f6200bb
TT		 3930 if (ext4_proc_root)
3931 sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);
240799cd 3932
66acdcf4
TT		 3933 if (sbi->s_proc)
3934 proc_create_data("options", S_IRUGO, sbi->s_proc,
3935 &ext4_seq_options_fops, sb);
3936
705895b6 3937 bgl_lock_init(sbi->s_blockgroup_lock);
ac27a0ec
DK		 3938
3939 for (i = 0; i < db_count; i++) {
70bbb3e0 3940 block = descriptor_loc(sb, logical_sb_block, i);
a8ac900b 3941 sbi->s_group_desc[i] = sb_bread_unmovable(sb, block);
ac27a0ec 3942 if (!sbi->s_group_desc[i]) {
b31e1552
ES		 3943 ext4_msg(sb, KERN_ERR,
3944 "can't read group descriptor %d", i);
ac27a0ec
DK		 3945 db_count = i;
3946 goto failed_mount2;
3947 }
3948 }
bfff6873 3949 if (!ext4_check_descriptors(sb, &first_not_zeroed)) {
b31e1552 3950 ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
f9ae9cf5 3951 goto failed_mount2;
ac27a0ec 3952 }
772cb7c8 3953
f9ae9cf5 3954 sbi->s_gdb_count = db_count;
ac27a0ec
DK		 3955 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
3956 spin_lock_init(&sbi->s_next_gen_lock);
3957
04ecddb7
JM		 3958 setup_timer(&sbi->s_err_report, print_daily_error_info,
3959 (unsigned long) sb);
04496411 3960
a75ae78f 3961 /* Register extent status tree shrinker */
eb68d0e2 3962 if (ext4_es_register_shrinker(sbi))
ce7e010a 3963 goto failed_mount3;
ce7e010a 3964
c9de560d 3965 sbi->s_stripe = ext4_get_stripe_size(sbi);
67a5da56 3966 sbi->s_extent_max_zeroout_kb = 32;
c9de560d 3967
f9ae9cf5
TT		 3968 /*
3969 * set up enough so that it can read an inode
3970 */
f6e63f90 3971 sb->s_op = &ext4_sops;
617ba13b
MC		 3972 sb->s_export_op = &ext4_export_ops;
3973 sb->s_xattr = ext4_xattr_handlers;
ac27a0ec 3974#ifdef CONFIG_QUOTA
617ba13b 3975 sb->dq_op = &ext4_quota_operations;
262b4662 3976 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA))
1fa5efe3 3977 sb->s_qcop = &dquot_quotactl_sysfile_ops;
262b4662
JK		 3978 else
3979 sb->s_qcop = &ext4_qctl_operations;
96c7e0d9 3980 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
ac27a0ec 3981#endif
f2fa2ffc
AK		 3982 memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
3983
ac27a0ec 3984 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
3b9d4ed2 3985 mutex_init(&sbi->s_orphan_lock);
ac27a0ec
DK		 3986
3987 sb->s_root = NULL;
3988
3989 needs_recovery = (es->s_last_orphan != 0 ||
617ba13b
MC		 3990 EXT4_HAS_INCOMPAT_FEATURE(sb,
3991 EXT4_FEATURE_INCOMPAT_RECOVER));
ac27a0ec 3992
c5e06d10
JL		 3993 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_MMP) &&
3994 !(sb->s_flags & MS_RDONLY))
3995 if (ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block)))
50460fe8 3996 goto failed_mount3a;
c5e06d10 3997
ac27a0ec
DK		 3998 /*
3999 * The first inode we look at is the journal inode. Don't try
4000 * root first: it may be modified in the journal!
4001 */
4002 if (!test_opt(sb, NOLOAD) &&
617ba13b
MC		 4003 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
4004 if (ext4_load_journal(sb, es, journal_devnum))
50460fe8 4005 goto failed_mount3a;
0390131b
FM		 4006 } else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) &&
4007 EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
b31e1552
ES		 4008 ext4_msg(sb, KERN_ERR, "required journal recovery "
4009 "suppressed and not mounted read-only");
744692dc 4010 goto failed_mount_wq;
ac27a0ec 4011 } else {
fd8c37ec 4012 clear_opt(sb, DATA_FLAGS);
0390131b
FM		 4013 sbi->s_journal = NULL;
4014 needs_recovery = 0;
4015 goto no_journal;
ac27a0ec
DK		 4016 }
4017
f32aaf2d 4018 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT) &&
eb40a09c
JS		 4019 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
4020 JBD2_FEATURE_INCOMPAT_64BIT)) {
b31e1552 4021 ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
744692dc 4022 goto failed_mount_wq;
eb40a09c
JS		 4023 }
4024
25ed6e8a
DW		 4025 if (!set_journal_csum_feature_set(sb)) {
4026 ext4_msg(sb, KERN_ERR, "Failed to set journal checksum "
4027 "feature set");
4028 goto failed_mount_wq;
d4da6c9c 4029 }
818d276c 4030
ac27a0ec
DK		 4031 /* We have now updated the journal if required, so we can
4032 * validate the data journaling mode. */
4033 switch (test_opt(sb, DATA_FLAGS)) {
4034 case 0:
4035 /* No mode set, assume a default based on the journal
63f57933
AM		 4036 * capabilities: ORDERED_DATA if the journal can
4037 * cope, else JOURNAL_DATA
4038 */
dab291af
MC		 4039 if (jbd2_journal_check_available_features
4040 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
fd8c37ec 4041 set_opt(sb, ORDERED_DATA);
ac27a0ec 4042 else
fd8c37ec 4043 set_opt(sb, JOURNAL_DATA);
ac27a0ec
DK		 4044 break;
4045
617ba13b
MC		 4046 case EXT4_MOUNT_ORDERED_DATA:
4047 case EXT4_MOUNT_WRITEBACK_DATA:
dab291af
MC		 4048 if (!jbd2_journal_check_available_features
4049 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
b31e1552
ES		 4050 ext4_msg(sb, KERN_ERR, "Journal does not support "
4051 "requested data journaling mode");
744692dc 4052 goto failed_mount_wq;
ac27a0ec
DK		 4053 }
4054 default:
4055 break;
4056 }
b3881f74 4057 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
ac27a0ec 4058
18aadd47
BJ		 4059 sbi->s_journal->j_commit_callback = ext4_journal_commit_callback;
4060
ce7e010a 4061no_journal:
9c191f70
M		 4062 if (ext4_mballoc_ready) {
4063 sbi->s_mb_cache = ext4_xattr_create_cache(sb->s_id);
4064 if (!sbi->s_mb_cache) {
4065 ext4_msg(sb, KERN_ERR, "Failed to create an mb_cache");
4066 goto failed_mount_wq;
4067 }
4068 }
4069
6ddb2447
TT		 4070 if (unlikely(sbi->s_mount_flags & EXT4_MF_TEST_DUMMY_ENCRYPTION) &&
4071 !(sb->s_flags & MS_RDONLY) &&
4072 !EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_ENCRYPT)) {
4073 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_ENCRYPT);
4074 ext4_commit_super(sb, 1);
4075 }
4076
952fc18e
TT		 4077 /*
4078 * Get the # of file system overhead blocks from the
4079 * superblock if present.
4080 */
4081 if (es->s_overhead_clusters)
4082 sbi->s_overhead = le32_to_cpu(es->s_overhead_clusters);
4083 else {
07aa2ea1
LC		 4084 err = ext4_calculate_overhead(sb);
4085 if (err)
952fc18e
TT		 4086 goto failed_mount_wq;
4087 }
4088
fd89d5f2
TH		 4089 /*
4090 * The maximum number of concurrent works can be high and
4091 * concurrency isn't really necessary. Limit it to 1.
4092 */
2e8fa54e
JK		 4093 EXT4_SB(sb)->rsv_conversion_wq =
4094 alloc_workqueue("ext4-rsv-conversion", WQ_MEM_RECLAIM | WQ_UNBOUND, 1);
4095 if (!EXT4_SB(sb)->rsv_conversion_wq) {
4096 printk(KERN_ERR "EXT4-fs: failed to create workqueue\n");
07aa2ea1 4097 ret = -ENOMEM;
2e8fa54e
JK		 4098 goto failed_mount4;
4099 }
4100
ac27a0ec 4101 /*
dab291af 4102 * The jbd2_journal_load will have done any necessary log recovery,
ac27a0ec
DK		 4103 * so we can safely mount the rest of the filesystem now.
4104 */
4105
1d1fe1ee
DH		 4106 root = ext4_iget(sb, EXT4_ROOT_INO);
4107 if (IS_ERR(root)) {
b31e1552 4108 ext4_msg(sb, KERN_ERR, "get root inode failed");
1d1fe1ee 4109 ret = PTR_ERR(root);
32a9bb57 4110 root = NULL;
ac27a0ec
DK		 4111 goto failed_mount4;
4112 }
4113 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
b31e1552 4114 ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
94bf608a 4115 iput(root);
ac27a0ec
DK		 4116 goto failed_mount4;
4117 }
48fde701 4118 sb->s_root = d_make_root(root);
1d1fe1ee 4119 if (!sb->s_root) {
b31e1552 4120 ext4_msg(sb, KERN_ERR, "get root dentry failed");
1d1fe1ee
DH		 4121 ret = -ENOMEM;
4122 goto failed_mount4;
4123 }
ac27a0ec 4124
7e84b621
ES		 4125 if (ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY))
4126 sb->s_flags |= MS_RDONLY;
ef7f3835
KS		 4127
4128 /* determine the minimum size of new large inodes, if present */
4129 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
4130 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
4131 EXT4_GOOD_OLD_INODE_SIZE;
4132 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
4133 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) {
4134 if (sbi->s_want_extra_isize <
4135 le16_to_cpu(es->s_want_extra_isize))
4136 sbi->s_want_extra_isize =
4137 le16_to_cpu(es->s_want_extra_isize);
4138 if (sbi->s_want_extra_isize <
4139 le16_to_cpu(es->s_min_extra_isize))
4140 sbi->s_want_extra_isize =
4141 le16_to_cpu(es->s_min_extra_isize);
4142 }
4143 }
4144 /* Check if enough inode space is available */
4145 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
4146 sbi->s_inode_size) {
4147 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
4148 EXT4_GOOD_OLD_INODE_SIZE;
b31e1552
ES		 4149 ext4_msg(sb, KERN_INFO, "required extra inode space not"
4150 "available");
ef7f3835
KS		 4151 }
4152
30fac0f7 4153 err = ext4_reserve_clusters(sbi, ext4_calculate_resv_clusters(sb));
27dd4385
LC		 4154 if (err) {
4155 ext4_msg(sb, KERN_ERR, "failed to reserve %llu clusters for "
30fac0f7 4156 "reserved pool", ext4_calculate_resv_clusters(sb));
f9ae9cf5 4157 goto failed_mount4a;
27dd4385
LC		 4158 }
4159
6fd058f7
TT		 4160 err = ext4_setup_system_zone(sb);
4161 if (err) {
b31e1552 4162 ext4_msg(sb, KERN_ERR, "failed to initialize system "
fbe845dd 4163 "zone (%d)", err);
f9ae9cf5
TT		 4164 goto failed_mount4a;
4165 }
4166
4167 ext4_ext_init(sb);
4168 err = ext4_mb_init(sb);
4169 if (err) {
4170 ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)",
4171 err);
dcf2d804 4172 goto failed_mount5;
c2774d84
AK		 4173 }
4174
d5e03cbb
TT		 4175 block = ext4_count_free_clusters(sb);
4176 ext4_free_blocks_count_set(sbi->s_es,
4177 EXT4_C2B(sbi, block));
908c7f19
TH		 4178 err = percpu_counter_init(&sbi->s_freeclusters_counter, block,
4179 GFP_KERNEL);
d5e03cbb
TT		 4180 if (!err) {
4181 unsigned long freei = ext4_count_free_inodes(sb);
4182 sbi->s_es->s_free_inodes_count = cpu_to_le32(freei);
908c7f19
TH		 4183 err = percpu_counter_init(&sbi->s_freeinodes_counter, freei,
4184 GFP_KERNEL);
d5e03cbb
TT		 4185 }
4186 if (!err)
4187 err = percpu_counter_init(&sbi->s_dirs_counter,
908c7f19 4188 ext4_count_dirs(sb), GFP_KERNEL);
d5e03cbb 4189 if (!err)
908c7f19
TH		 4190 err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0,
4191 GFP_KERNEL);
d5e03cbb
TT		 4192 if (err) {
4193 ext4_msg(sb, KERN_ERR, "insufficient memory");
4194 goto failed_mount6;
4195 }
4196
4197 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
4198 if (!ext4_fill_flex_info(sb)) {
4199 ext4_msg(sb, KERN_ERR,
4200 "unable to initialize "
4201 "flex_bg meta info!");
4202 goto failed_mount6;
4203 }
4204
bfff6873
LC		 4205 err = ext4_register_li_request(sb, first_not_zeroed);
4206 if (err)
dcf2d804 4207 goto failed_mount6;
bfff6873 4208
3197ebdb
TT		 4209 sbi->s_kobj.kset = ext4_kset;
4210 init_completion(&sbi->s_kobj_unregister);
4211 err = kobject_init_and_add(&sbi->s_kobj, &ext4_ktype, NULL,
4212 "%s", sb->s_id);
dcf2d804
TM		 4213 if (err)
4214 goto failed_mount7;
3197ebdb 4215
9b2ff357
JK		 4216#ifdef CONFIG_QUOTA
4217 /* Enable quota usage during mount. */
4218 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) &&
4219 !(sb->s_flags & MS_RDONLY)) {
4220 err = ext4_enable_quotas(sb);
4221 if (err)
4222 goto failed_mount8;
4223 }
4224#endif /* CONFIG_QUOTA */
4225
617ba13b
MC		 4226 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
4227 ext4_orphan_cleanup(sb, es);
4228 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
0390131b 4229 if (needs_recovery) {
b31e1552 4230 ext4_msg(sb, KERN_INFO, "recovery complete");
0390131b
FM		 4231 ext4_mark_recovery_complete(sb, es);
4232 }
4233 if (EXT4_SB(sb)->s_journal) {
4234 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
4235 descr = " journalled data mode";
4236 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
4237 descr = " ordered data mode";
4238 else
4239 descr = " writeback data mode";
4240 } else
4241 descr = "out journal";
4242
79add3a3
LC		 4243 if (test_opt(sb, DISCARD)) {
4244 struct request_queue *q = bdev_get_queue(sb->s_bdev);
4245 if (!blk_queue_discard(q))
4246 ext4_msg(sb, KERN_WARNING,
4247 "mounting with \"discard\" option, but "
4248 "the device does not support discard");
4249 }
4250
d4c402d9 4251 ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. "
8b67f04a
TT		 4252 "Opts: %s%s%s", descr, sbi->s_es->s_mount_opts,
4253 *sbi->s_es->s_mount_opts ? "; " : "", orig_data);
ac27a0ec 4254
66e61a9e
TT		 4255 if (es->s_error_count)
4256 mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */
ac27a0ec 4257
efbed4dc
TT		 4258 /* Enable message ratelimiting. Default is 10 messages per 5 secs. */
4259 ratelimit_state_init(&sbi->s_err_ratelimit_state, 5 * HZ, 10);
4260 ratelimit_state_init(&sbi->s_warning_ratelimit_state, 5 * HZ, 10);
4261 ratelimit_state_init(&sbi->s_msg_ratelimit_state, 5 * HZ, 10);
4262
d4c402d9 4263 kfree(orig_data);
ac27a0ec
DK		 4264 return 0;
4265
617ba13b 4266cantfind_ext4:
ac27a0ec 4267 if (!silent)
b31e1552 4268 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
ac27a0ec
DK		 4269 goto failed_mount;
4270
72ba7450
TT		 4271#ifdef CONFIG_QUOTA
4272failed_mount8:
4273 kobject_del(&sbi->s_kobj);
4274#endif
dcf2d804
TM		 4275failed_mount7:
4276 ext4_unregister_li_request(sb);
4277failed_mount6:
f9ae9cf5 4278 ext4_mb_release(sb);
d5e03cbb 4279 if (sbi->s_flex_groups)
b93b41d4 4280 kvfree(sbi->s_flex_groups);
d5e03cbb
TT		 4281 percpu_counter_destroy(&sbi->s_freeclusters_counter);
4282 percpu_counter_destroy(&sbi->s_freeinodes_counter);
4283 percpu_counter_destroy(&sbi->s_dirs_counter);
4284 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
00764937 4285failed_mount5:
f9ae9cf5
TT		 4286 ext4_ext_release(sb);
4287 ext4_release_system_zone(sb);
4288failed_mount4a:
94bf608a 4289 dput(sb->s_root);
32a9bb57 4290 sb->s_root = NULL;
94bf608a 4291failed_mount4:
b31e1552 4292 ext4_msg(sb, KERN_ERR, "mount failed");
2e8fa54e
JK		 4293 if (EXT4_SB(sb)->rsv_conversion_wq)
4294 destroy_workqueue(EXT4_SB(sb)->rsv_conversion_wq);
4c0425ff 4295failed_mount_wq:
0390131b
FM		 4296 if (sbi->s_journal) {
4297 jbd2_journal_destroy(sbi->s_journal);
4298 sbi->s_journal = NULL;
4299 }
50460fe8 4300failed_mount3a:
d3922a77 4301 ext4_es_unregister_shrinker(sbi);
eb68d0e2 4302failed_mount3:
9105bb14 4303 del_timer_sync(&sbi->s_err_report);
c5e06d10
JL		 4304 if (sbi->s_mmp_tsk)
4305 kthread_stop(sbi->s_mmp_tsk);
ac27a0ec
DK		 4306failed_mount2:
4307 for (i = 0; i < db_count; i++)
4308 brelse(sbi->s_group_desc[i]);
b93b41d4 4309 kvfree(sbi->s_group_desc);
ac27a0ec 4310failed_mount:
0441984a
DW		 4311 if (sbi->s_chksum_driver)
4312 crypto_free_shash(sbi->s_chksum_driver);
240799cd 4313 if (sbi->s_proc) {
66acdcf4 4314 remove_proc_entry("options", sbi->s_proc);
9f6200bb 4315 remove_proc_entry(sb->s_id, ext4_proc_root);
240799cd 4316 }
ac27a0ec 4317#ifdef CONFIG_QUOTA
a2d4a646 4318 for (i = 0; i < EXT4_MAXQUOTAS; i++)
ac27a0ec
DK		 4319 kfree(sbi->s_qf_names[i]);
4320#endif
617ba13b 4321 ext4_blkdev_remove(sbi);
ac27a0ec
DK		 4322 brelse(bh);
4323out_fail:
4324 sb->s_fs_info = NULL;
f6830165 4325 kfree(sbi->s_blockgroup_lock);
ac27a0ec 4326 kfree(sbi);
dcc7dae3 4327out_free_orig:
d4c402d9 4328 kfree(orig_data);
07aa2ea1 4329 return err ? err : ret;
ac27a0ec
DK		 4330}
4331
4332/*
4333 * Setup any per-fs journal parameters now. We'll do this both on
4334 * initial mount, once the journal has been initialised but before we've
4335 * done any recovery; and again on any subsequent remount.
4336 */
617ba13b 4337static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
ac27a0ec 4338{
617ba13b 4339 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4340
30773840
TT		 4341 journal->j_commit_interval = sbi->s_commit_interval;
4342 journal->j_min_batch_time = sbi->s_min_batch_time;
4343 journal->j_max_batch_time = sbi->s_max_batch_time;
ac27a0ec 4344
a931da6a 4345 write_lock(&journal->j_state_lock);
ac27a0ec 4346 if (test_opt(sb, BARRIER))
dab291af 4347 journal->j_flags |= JBD2_BARRIER;
ac27a0ec 4348 else
dab291af 4349 journal->j_flags &= ~JBD2_BARRIER;
5bf5683a
HK		 4350 if (test_opt(sb, DATA_ERR_ABORT))
4351 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
4352 else
4353 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
a931da6a 4354 write_unlock(&journal->j_state_lock);
ac27a0ec
DK		 4355}
4356
617ba13b 4357static journal_t *ext4_get_journal(struct super_block *sb,
ac27a0ec
DK		 4358 unsigned int journal_inum)
4359{
4360 struct inode *journal_inode;
4361 journal_t *journal;
4362
0390131b
FM		 4363 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4364
ac27a0ec
DK		 4365 /* First, test for the existence of a valid inode on disk. Bad
4366 * things happen if we iget() an unused inode, as the subsequent
4367 * iput() will try to delete it. */
4368
1d1fe1ee
DH		 4369 journal_inode = ext4_iget(sb, journal_inum);
4370 if (IS_ERR(journal_inode)) {
b31e1552 4371 ext4_msg(sb, KERN_ERR, "no journal found");
ac27a0ec
DK		 4372 return NULL;
4373 }
4374 if (!journal_inode->i_nlink) {
4375 make_bad_inode(journal_inode);
4376 iput(journal_inode);
b31e1552 4377 ext4_msg(sb, KERN_ERR, "journal inode is deleted");
ac27a0ec
DK		 4378 return NULL;
4379 }
4380
e5f8eab8 4381 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
ac27a0ec 4382 journal_inode, journal_inode->i_size);
1d1fe1ee 4383 if (!S_ISREG(journal_inode->i_mode)) {
b31e1552 4384 ext4_msg(sb, KERN_ERR, "invalid journal inode");
ac27a0ec
DK		 4385 iput(journal_inode);
4386 return NULL;
4387 }
4388
dab291af 4389 journal = jbd2_journal_init_inode(journal_inode);
ac27a0ec 4390 if (!journal) {
b31e1552 4391 ext4_msg(sb, KERN_ERR, "Could not load journal inode");
ac27a0ec
DK		 4392 iput(journal_inode);
4393 return NULL;
4394 }
4395 journal->j_private = sb;
617ba13b 4396 ext4_init_journal_params(sb, journal);
ac27a0ec
DK		 4397 return journal;
4398}
4399
617ba13b 4400static journal_t *ext4_get_dev_journal(struct super_block *sb,
ac27a0ec
DK		 4401 dev_t j_dev)
4402{
2b2d6d01 4403 struct buffer_head *bh;
ac27a0ec 4404 journal_t *journal;
617ba13b
MC		 4405 ext4_fsblk_t start;
4406 ext4_fsblk_t len;
ac27a0ec 4407 int hblock, blocksize;
617ba13b 4408 ext4_fsblk_t sb_block;
ac27a0ec 4409 unsigned long offset;
2b2d6d01 4410 struct ext4_super_block *es;
ac27a0ec
DK		 4411 struct block_device *bdev;
4412
0390131b
FM		 4413 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4414
b31e1552 4415 bdev = ext4_blkdev_get(j_dev, sb);
ac27a0ec
DK		 4416 if (bdev == NULL)
4417 return NULL;
4418
ac27a0ec 4419 blocksize = sb->s_blocksize;
e1defc4f 4420 hblock = bdev_logical_block_size(bdev);
ac27a0ec 4421 if (blocksize < hblock) {
b31e1552
ES		 4422 ext4_msg(sb, KERN_ERR,
4423 "blocksize too small for journal device");
ac27a0ec
DK		 4424 goto out_bdev;
4425 }
4426
617ba13b
MC		 4427 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
4428 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
ac27a0ec
DK		 4429 set_blocksize(bdev, blocksize);
4430 if (!(bh = __bread(bdev, sb_block, blocksize))) {
b31e1552
ES		 4431 ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
4432 "external journal");
ac27a0ec
DK		 4433 goto out_bdev;
4434 }
4435
2716b802 4436 es = (struct ext4_super_block *) (bh->b_data + offset);
617ba13b 4437 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
ac27a0ec 4438 !(le32_to_cpu(es->s_feature_incompat) &
617ba13b 4439 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
b31e1552
ES		 4440 ext4_msg(sb, KERN_ERR, "external journal has "
4441 "bad superblock");
ac27a0ec
DK		 4442 brelse(bh);
4443 goto out_bdev;
4444 }
4445
df4763be
DW		 4446 if ((le32_to_cpu(es->s_feature_ro_compat) &
4447 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) &&
4448 es->s_checksum != ext4_superblock_csum(sb, es)) {
4449 ext4_msg(sb, KERN_ERR, "external journal has "
4450 "corrupt superblock");
4451 brelse(bh);
4452 goto out_bdev;
4453 }
4454
617ba13b 4455 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
b31e1552 4456 ext4_msg(sb, KERN_ERR, "journal UUID does not match");
ac27a0ec
DK		 4457 brelse(bh);
4458 goto out_bdev;
4459 }
4460
bd81d8ee 4461 len = ext4_blocks_count(es);
ac27a0ec
DK		 4462 start = sb_block + 1;
4463 brelse(bh); /* we're done with the superblock */
4464
dab291af 4465 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
ac27a0ec
DK		 4466 start, len, blocksize);
4467 if (!journal) {
b31e1552 4468 ext4_msg(sb, KERN_ERR, "failed to create device journal");
ac27a0ec
DK		 4469 goto out_bdev;
4470 }
4471 journal->j_private = sb;
9f203507 4472 ll_rw_block(READ | REQ_META | REQ_PRIO, 1, &journal->j_sb_buffer);
ac27a0ec
DK		 4473 wait_on_buffer(journal->j_sb_buffer);
4474 if (!buffer_uptodate(journal->j_sb_buffer)) {
b31e1552 4475 ext4_msg(sb, KERN_ERR, "I/O error on journal device");
ac27a0ec
DK		 4476 goto out_journal;
4477 }
4478 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
b31e1552
ES		 4479 ext4_msg(sb, KERN_ERR, "External journal has more than one "
4480 "user (unsupported) - %d",
ac27a0ec
DK		 4481 be32_to_cpu(journal->j_superblock->s_nr_users));
4482 goto out_journal;
4483 }
617ba13b
MC		 4484 EXT4_SB(sb)->journal_bdev = bdev;
4485 ext4_init_journal_params(sb, journal);
ac27a0ec 4486 return journal;
0b8e58a1 4487
ac27a0ec 4488out_journal:
dab291af 4489 jbd2_journal_destroy(journal);
ac27a0ec 4490out_bdev:
617ba13b 4491 ext4_blkdev_put(bdev);
ac27a0ec
DK		 4492 return NULL;
4493}
4494
617ba13b
MC		 4495static int ext4_load_journal(struct super_block *sb,
4496 struct ext4_super_block *es,
ac27a0ec
DK		 4497 unsigned long journal_devnum)
4498{
4499 journal_t *journal;
4500 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
4501 dev_t journal_dev;
4502 int err = 0;
4503 int really_read_only;
4504
0390131b
FM		 4505 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4506
ac27a0ec
DK		 4507 if (journal_devnum &&
4508 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
b31e1552
ES		 4509 ext4_msg(sb, KERN_INFO, "external journal device major/minor "
4510 "numbers have changed");
ac27a0ec
DK		 4511 journal_dev = new_decode_dev(journal_devnum);
4512 } else
4513 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
4514
4515 really_read_only = bdev_read_only(sb->s_bdev);
4516
4517 /*
4518 * Are we loading a blank journal or performing recovery after a
4519 * crash? For recovery, we need to check in advance whether we
4520 * can get read-write access to the device.
4521 */
617ba13b 4522 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
ac27a0ec 4523 if (sb->s_flags & MS_RDONLY) {
b31e1552
ES		 4524 ext4_msg(sb, KERN_INFO, "INFO: recovery "
4525 "required on readonly filesystem");
ac27a0ec 4526 if (really_read_only) {
b31e1552
ES		 4527 ext4_msg(sb, KERN_ERR, "write access "
4528 "unavailable, cannot proceed");
ac27a0ec
DK		 4529 return -EROFS;
4530 }
b31e1552
ES		 4531 ext4_msg(sb, KERN_INFO, "write access will "
4532 "be enabled during recovery");
ac27a0ec
DK		 4533 }
4534 }
4535
4536 if (journal_inum && journal_dev) {
b31e1552
ES		 4537 ext4_msg(sb, KERN_ERR, "filesystem has both journal "
4538 "and inode journals!");
ac27a0ec
DK		 4539 return -EINVAL;
4540 }
4541
4542 if (journal_inum) {
617ba13b 4543 if (!(journal = ext4_get_journal(sb, journal_inum)))
ac27a0ec
DK		 4544 return -EINVAL;
4545 } else {
617ba13b 4546 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
ac27a0ec
DK		 4547 return -EINVAL;
4548 }
4549
90576c0b 4550 if (!(journal->j_flags & JBD2_BARRIER))
b31e1552 4551 ext4_msg(sb, KERN_INFO, "barriers disabled");
4776004f 4552
617ba13b 4553 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
dab291af 4554 err = jbd2_journal_wipe(journal, !really_read_only);
1c13d5c0
TT		 4555 if (!err) {
4556 char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL);
4557 if (save)
4558 memcpy(save, ((char *) es) +
4559 EXT4_S_ERR_START, EXT4_S_ERR_LEN);
dab291af 4560 err = jbd2_journal_load(journal);
1c13d5c0
TT		 4561 if (save)
4562 memcpy(((char *) es) + EXT4_S_ERR_START,
4563 save, EXT4_S_ERR_LEN);
4564 kfree(save);
4565 }
ac27a0ec
DK		 4566
4567 if (err) {
b31e1552 4568 ext4_msg(sb, KERN_ERR, "error loading journal");
dab291af 4569 jbd2_journal_destroy(journal);
ac27a0ec
DK		 4570 return err;
4571 }
4572
617ba13b
MC		 4573 EXT4_SB(sb)->s_journal = journal;
4574 ext4_clear_journal_err(sb, es);
ac27a0ec 4575
c41303ce 4576 if (!really_read_only && journal_devnum &&
ac27a0ec
DK		 4577 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
4578 es->s_journal_dev = cpu_to_le32(journal_devnum);
ac27a0ec
DK		 4579
4580 /* Make sure we flush the recovery flag to disk. */
e2d67052 4581 ext4_commit_super(sb, 1);
ac27a0ec
DK		 4582 }
4583
4584 return 0;
4585}
4586
e2d67052 4587static int ext4_commit_super(struct super_block *sb, int sync)
ac27a0ec 4588{
e2d67052 4589 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
617ba13b 4590 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
c4be0c1d 4591 int error = 0;
ac27a0ec 4592
08439fec 4593 if (!sbh)
c4be0c1d 4594 return error;
914258bf
TT		 4595 if (buffer_write_io_error(sbh)) {
4596 /*
4597 * Oh, dear. A previous attempt to write the
4598 * superblock failed. This could happen because the
4599 * USB device was yanked out. Or it could happen to
4600 * be a transient write error and maybe the block will
4601 * be remapped. Nothing we can do but to retry the
4602 * write and hope for the best.
4603 */
b31e1552
ES		 4604 ext4_msg(sb, KERN_ERR, "previous I/O error to "
4605 "superblock detected");
914258bf
TT		 4606 clear_buffer_write_io_error(sbh);
4607 set_buffer_uptodate(sbh);
4608 }
71290b36
TT		 4609 /*
4610 * If the file system is mounted read-only, don't update the
4611 * superblock write time. This avoids updating the superblock
4612 * write time when we are mounting the root file system
4613 * read/only but we need to replay the journal; at that point,
4614 * for people who are east of GMT and who make their clock
4615 * tick in localtime for Windows bug-for-bug compatibility,
4616 * the clock is set in the future, and this will cause e2fsck
4617 * to complain and force a full file system check.
4618 */
4619 if (!(sb->s_flags & MS_RDONLY))
4620 es->s_wtime = cpu_to_le32(get_seconds());
f613dfcb
TT		 4621 if (sb->s_bdev->bd_part)
4622 es->s_kbytes_written =
4623 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written +
afc32f7e
TT		 4624 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
4625 EXT4_SB(sb)->s_sectors_written_start) >> 1));
f613dfcb
TT		 4626 else
4627 es->s_kbytes_written =
4628 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written);
d5e03cbb
TT		 4629 if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeclusters_counter))
4630 ext4_free_blocks_count_set(es,
57042651
TT		 4631 EXT4_C2B(EXT4_SB(sb), percpu_counter_sum_positive(
4632 &EXT4_SB(sb)->s_freeclusters_counter)));
d5e03cbb
TT		 4633 if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeinodes_counter))
4634 es->s_free_inodes_count =
4635 cpu_to_le32(percpu_counter_sum_positive(
ce7e010a 4636 &EXT4_SB(sb)->s_freeinodes_counter));
ac27a0ec 4637 BUFFER_TRACE(sbh, "marking dirty");
06db49e6 4638 ext4_superblock_csum_set(sb);
ac27a0ec 4639 mark_buffer_dirty(sbh);
914258bf 4640 if (sync) {
c4be0c1d
TS		 4641 error = sync_dirty_buffer(sbh);
4642 if (error)
4643 return error;
4644
4645 error = buffer_write_io_error(sbh);
4646 if (error) {
b31e1552
ES		 4647 ext4_msg(sb, KERN_ERR, "I/O error while writing "
4648 "superblock");
914258bf
TT		 4649 clear_buffer_write_io_error(sbh);
4650 set_buffer_uptodate(sbh);
4651 }
4652 }
c4be0c1d 4653 return error;
ac27a0ec
DK		 4654}
4655
ac27a0ec
DK		 4656/*
4657 * Have we just finished recovery? If so, and if we are mounting (or
4658 * remounting) the filesystem readonly, then we will end up with a
4659 * consistent fs on disk. Record that fact.
4660 */
2b2d6d01
TT		 4661static void ext4_mark_recovery_complete(struct super_block *sb,
4662 struct ext4_super_block *es)
ac27a0ec 4663{
617ba13b 4664 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 4665
0390131b
FM		 4666 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
4667 BUG_ON(journal != NULL);
4668 return;
4669 }
dab291af 4670 jbd2_journal_lock_updates(journal);
7ffe1ea8
HK		 4671 if (jbd2_journal_flush(journal) < 0)
4672 goto out;
4673
617ba13b 4674 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
ac27a0ec 4675 sb->s_flags & MS_RDONLY) {
617ba13b 4676 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
e2d67052 4677 ext4_commit_super(sb, 1);
ac27a0ec 4678 }
7ffe1ea8
HK		 4679
4680out:
dab291af 4681 jbd2_journal_unlock_updates(journal);
ac27a0ec
DK		 4682}
4683
4684/*
4685 * If we are mounting (or read-write remounting) a filesystem whose journal
4686 * has recorded an error from a previous lifetime, move that error to the
4687 * main filesystem now.
4688 */
2b2d6d01
TT		 4689static void ext4_clear_journal_err(struct super_block *sb,
4690 struct ext4_super_block *es)
ac27a0ec
DK		 4691{
4692 journal_t *journal;
4693 int j_errno;
4694 const char *errstr;
4695
0390131b
FM		 4696 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4697
617ba13b 4698 journal = EXT4_SB(sb)->s_journal;
ac27a0ec
DK		 4699
4700 /*
4701 * Now check for any error status which may have been recorded in the
617ba13b 4702 * journal by a prior ext4_error() or ext4_abort()
ac27a0ec
DK		 4703 */
4704
dab291af 4705 j_errno = jbd2_journal_errno(journal);
ac27a0ec
DK		 4706 if (j_errno) {
4707 char nbuf[16];
4708
617ba13b 4709 errstr = ext4_decode_error(sb, j_errno, nbuf);
12062ddd 4710 ext4_warning(sb, "Filesystem error recorded "
ac27a0ec 4711 "from previous mount: %s", errstr);
12062ddd 4712 ext4_warning(sb, "Marking fs in need of filesystem check.");
ac27a0ec 4713
617ba13b
MC		 4714 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
4715 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
e2d67052 4716 ext4_commit_super(sb, 1);
ac27a0ec 4717
dab291af 4718 jbd2_journal_clear_err(journal);
d796c52e 4719 jbd2_journal_update_sb_errno(journal);
ac27a0ec
DK		 4720 }
4721}
4722
4723/*
4724 * Force the running and committing transactions to commit,
4725 * and wait on the commit.
4726 */
617ba13b 4727int ext4_force_commit(struct super_block *sb)
ac27a0ec
DK		 4728{
4729 journal_t *journal;
ac27a0ec
DK		 4730
4731 if (sb->s_flags & MS_RDONLY)
4732 return 0;
4733
617ba13b 4734 journal = EXT4_SB(sb)->s_journal;
b1deefc9 4735 return ext4_journal_force_commit(journal);
ac27a0ec
DK		 4736}
4737
617ba13b 4738static int ext4_sync_fs(struct super_block *sb, int wait)
ac27a0ec 4739{
14ce0cb4 4740 int ret = 0;
9eddacf9 4741 tid_t target;
06a407f1 4742 bool needs_barrier = false;
8d5d02e6 4743 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4744
9bffad1e 4745 trace_ext4_sync_fs(sb, wait);
2e8fa54e 4746 flush_workqueue(sbi->rsv_conversion_wq);
a1177825
JK		 4747 /*
4748 * Writeback quota in non-journalled quota case - journalled quota has
4749 * no dirty dquots
4750 */
4751 dquot_writeback_dquots(sb, -1);
06a407f1
DM		 4752 /*
4753 * Data writeback is possible w/o journal transaction, so barrier must
4754 * being sent at the end of the function. But we can skip it if
4755 * transaction_commit will do it for us.
4756 */
bda32530
TT		 4757 if (sbi->s_journal) {
4758 target = jbd2_get_latest_transaction(sbi->s_journal);
4759 if (wait && sbi->s_journal->j_flags & JBD2_BARRIER &&
4760 !jbd2_trans_will_send_data_barrier(sbi->s_journal, target))
4761 needs_barrier = true;
4762
4763 if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
4764 if (wait)
4765 ret = jbd2_log_wait_commit(sbi->s_journal,
4766 target);
4767 }
4768 } else if (wait && test_opt(sb, BARRIER))
06a407f1 4769 needs_barrier = true;
06a407f1
DM		 4770 if (needs_barrier) {
4771 int err;
4772 err = blkdev_issue_flush(sb->s_bdev, GFP_KERNEL, NULL);
4773 if (!ret)
4774 ret = err;
0390131b 4775 }
06a407f1
DM		 4776
4777 return ret;
4778}
4779
ac27a0ec
DK		 4780/*
4781 * LVM calls this function before a (read-only) snapshot is created. This
4782 * gives us a chance to flush the journal completely and mark the fs clean.
be4f27d3
YY		 4783 *
4784 * Note that only this function cannot bring a filesystem to be in a clean
8e8ad8a5
JK		 4785 * state independently. It relies on upper layer to stop all data & metadata
4786 * modifications.
ac27a0ec 4787 */
c4be0c1d 4788static int ext4_freeze(struct super_block *sb)
ac27a0ec 4789{
c4be0c1d
TS		 4790 int error = 0;
4791 journal_t *journal;
ac27a0ec 4792
9ca92389
TT		 4793 if (sb->s_flags & MS_RDONLY)
4794 return 0;
ac27a0ec 4795
9ca92389 4796 journal = EXT4_SB(sb)->s_journal;
7ffe1ea8 4797
bb044576
TT		 4798 if (journal) {
4799 /* Now we set up the journal barrier. */
4800 jbd2_journal_lock_updates(journal);
ac27a0ec 4801
bb044576
TT		 4802 /*
4803 * Don't clear the needs_recovery flag if we failed to
4804 * flush the journal.
4805 */
4806 error = jbd2_journal_flush(journal);
4807 if (error < 0)
4808 goto out;
4809 }
9ca92389
TT		 4810
4811 /* Journal blocked and flushed, clear needs_recovery flag. */
4812 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4813 error = ext4_commit_super(sb, 1);
6b0310fb 4814out:
bb044576
TT		 4815 if (journal)
4816 /* we rely on upper layer to stop further updates */
4817 jbd2_journal_unlock_updates(journal);
6b0310fb 4818 return error;
ac27a0ec
DK		 4819}
4820
4821/*
4822 * Called by LVM after the snapshot is done. We need to reset the RECOVER
4823 * flag here, even though the filesystem is not technically dirty yet.
4824 */
c4be0c1d 4825static int ext4_unfreeze(struct super_block *sb)
ac27a0ec 4826{
9ca92389
TT		 4827 if (sb->s_flags & MS_RDONLY)
4828 return 0;
4829
9ca92389
TT		 4830 /* Reset the needs_recovery flag before the fs is unlocked. */
4831 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4832 ext4_commit_super(sb, 1);
c4be0c1d 4833 return 0;
ac27a0ec
DK		 4834}
4835
673c6100
TT		 4836/*
4837 * Structure to save mount options for ext4_remount's benefit
4838 */
4839struct ext4_mount_options {
4840 unsigned long s_mount_opt;
a2595b8a 4841 unsigned long s_mount_opt2;
08cefc7a
EB		 4842 kuid_t s_resuid;
4843 kgid_t s_resgid;
673c6100
TT		 4844 unsigned long s_commit_interval;
4845 u32 s_min_batch_time, s_max_batch_time;
4846#ifdef CONFIG_QUOTA
4847 int s_jquota_fmt;
a2d4a646 4848 char *s_qf_names[EXT4_MAXQUOTAS];
673c6100
TT		 4849#endif
4850};
4851
2b2d6d01 4852static int ext4_remount(struct super_block *sb, int *flags, char *data)
ac27a0ec 4853{
2b2d6d01 4854 struct ext4_super_block *es;
617ba13b 4855 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4856 unsigned long old_sb_flags;
617ba13b 4857 struct ext4_mount_options old_opts;
c79d967d 4858 int enable_quota = 0;
8a266467 4859 ext4_group_t g;
b3881f74 4860 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
c5e06d10 4861 int err = 0;
ac27a0ec 4862#ifdef CONFIG_QUOTA
03dafb5f 4863 int i, j;
ac27a0ec 4864#endif
d4c402d9 4865 char *orig_data = kstrdup(data, GFP_KERNEL);
ac27a0ec
DK		 4866
4867 /* Store the original options */
4868 old_sb_flags = sb->s_flags;
4869 old_opts.s_mount_opt = sbi->s_mount_opt;
a2595b8a 4870 old_opts.s_mount_opt2 = sbi->s_mount_opt2;
ac27a0ec
DK		 4871 old_opts.s_resuid = sbi->s_resuid;
4872 old_opts.s_resgid = sbi->s_resgid;
4873 old_opts.s_commit_interval = sbi->s_commit_interval;
30773840
TT		 4874 old_opts.s_min_batch_time = sbi->s_min_batch_time;
4875 old_opts.s_max_batch_time = sbi->s_max_batch_time;
ac27a0ec
DK		 4876#ifdef CONFIG_QUOTA
4877 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
a2d4a646 4878 for (i = 0; i < EXT4_MAXQUOTAS; i++)
03dafb5f
CG		 4879 if (sbi->s_qf_names[i]) {
4880 old_opts.s_qf_names[i] = kstrdup(sbi->s_qf_names[i],
4881 GFP_KERNEL);
4882 if (!old_opts.s_qf_names[i]) {
4883 for (j = 0; j < i; j++)
4884 kfree(old_opts.s_qf_names[j]);
3e36a163 4885 kfree(orig_data);
03dafb5f
CG		 4886 return -ENOMEM;
4887 }
4888 } else
4889 old_opts.s_qf_names[i] = NULL;
ac27a0ec 4890#endif
b3881f74
TT		 4891 if (sbi->s_journal && sbi->s_journal->j_task->io_context)
4892 journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
ac27a0ec 4893
661aa520 4894 if (!parse_options(data, sb, NULL, &journal_ioprio, 1)) {
ac27a0ec
DK		 4895 err = -EINVAL;
4896 goto restore_opts;
4897 }
4898
6b992ff2 4899 if ((old_opts.s_mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) ^
c6d3d56d
DW		 4900 test_opt(sb, JOURNAL_CHECKSUM)) {
4901 ext4_msg(sb, KERN_ERR, "changing journal_checksum "
2d5b86e0
ES		 4902 "during remount not supported; ignoring");
4903 sbi->s_mount_opt ^= EXT4_MOUNT_JOURNAL_CHECKSUM;
6b992ff2
DW		 4904 }
4905
6ae6514b
PS		 4906 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
4907 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
4908 ext4_msg(sb, KERN_ERR, "can't mount with "
4909 "both data=journal and delalloc");
4910 err = -EINVAL;
4911 goto restore_opts;
4912 }
4913 if (test_opt(sb, DIOREAD_NOLOCK)) {
4914 ext4_msg(sb, KERN_ERR, "can't mount with "
4915 "both data=journal and dioread_nolock");
4916 err = -EINVAL;
4917 goto restore_opts;
4918 }
923ae0ff
RZ		 4919 if (test_opt(sb, DAX)) {
4920 ext4_msg(sb, KERN_ERR, "can't mount with "
4921 "both data=journal and dax");
4922 err = -EINVAL;
4923 goto restore_opts;
4924 }
4925 }
4926
4927 if ((sbi->s_mount_opt ^ old_opts.s_mount_opt) & EXT4_MOUNT_DAX) {
4928 ext4_msg(sb, KERN_WARNING, "warning: refusing change of "
4929 "dax flag with busy inodes while remounting");
4930 sbi->s_mount_opt ^= EXT4_MOUNT_DAX;
6ae6514b
PS		 4931 }
4932
4ab2f15b 4933 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
c67d859e 4934 ext4_abort(sb, "Abort forced by user");
ac27a0ec
DK		 4935
4936 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
482a7425 4937 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec
DK		 4938
4939 es = sbi->s_es;
4940
b3881f74 4941 if (sbi->s_journal) {
0390131b 4942 ext4_init_journal_params(sb, sbi->s_journal);
b3881f74
TT		 4943 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
4944 }
ac27a0ec 4945
661aa520 4946 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
4ab2f15b 4947 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) {
ac27a0ec
DK		 4948 err = -EROFS;
4949 goto restore_opts;
4950 }
4951
4952 if (*flags & MS_RDONLY) {
38c03b34
TT		 4953 err = sync_filesystem(sb);
4954 if (err < 0)
4955 goto restore_opts;
0f0dd62f
CH		 4956 err = dquot_suspend(sb, -1);
4957 if (err < 0)
c79d967d 4958 goto restore_opts;
c79d967d 4959
ac27a0ec
DK		 4960 /*
4961 * First of all, the unconditional stuff we have to do
4962 * to disable replay of the journal when we next remount
4963 */
4964 sb->s_flags |= MS_RDONLY;
4965
4966 /*
4967 * OK, test if we are remounting a valid rw partition
4968 * readonly, and if so set the rdonly flag and then
4969 * mark the partition as valid again.
4970 */
617ba13b
MC		 4971 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
4972 (sbi->s_mount_state & EXT4_VALID_FS))
ac27a0ec
DK		 4973 es->s_state = cpu_to_le16(sbi->s_mount_state);
4974
a63c9eb2 4975 if (sbi->s_journal)
0390131b 4976 ext4_mark_recovery_complete(sb, es);
ac27a0ec 4977 } else {
a13fb1a4 4978 /* Make sure we can mount this feature set readwrite */
2cb5cc8b
DW		 4979 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
4980 EXT4_FEATURE_RO_COMPAT_READONLY) ||
4981 !ext4_feature_set_ok(sb, 0)) {
ac27a0ec
DK		 4982 err = -EROFS;
4983 goto restore_opts;
4984 }
8a266467
TT		 4985 /*
4986 * Make sure the group descriptor checksums
0b8e58a1 4987 * are sane. If they aren't, refuse to remount r/w.
8a266467
TT		 4988 */
4989 for (g = 0; g < sbi->s_groups_count; g++) {
4990 struct ext4_group_desc *gdp =
4991 ext4_get_group_desc(sb, g, NULL);
4992
feb0ab32 4993 if (!ext4_group_desc_csum_verify(sb, g, gdp)) {
b31e1552
ES		 4994 ext4_msg(sb, KERN_ERR,
4995 "ext4_remount: Checksum for group %u failed (%u!=%u)",
8a266467
TT		 4996 g, le16_to_cpu(ext4_group_desc_csum(sbi, g, gdp)),
4997 le16_to_cpu(gdp->bg_checksum));
4998 err = -EINVAL;
4999 goto restore_opts;
5000 }
5001 }
5002
ead6596b
ES		 5003 /*
5004 * If we have an unprocessed orphan list hanging
5005 * around from a previously readonly bdev mount,
5006 * require a full umount/remount for now.
5007 */
5008 if (es->s_last_orphan) {
b31e1552 5009 ext4_msg(sb, KERN_WARNING, "Couldn't "
ead6596b
ES		 5010 "remount RDWR because of unprocessed "
5011 "orphan inode list. Please "
b31e1552 5012 "umount/remount instead");
ead6596b
ES		 5013 err = -EINVAL;
5014 goto restore_opts;
5015 }
5016
ac27a0ec
DK		 5017 /*
5018 * Mounting a RDONLY partition read-write, so reread
5019 * and store the current valid flag. (It may have
5020 * been changed by e2fsck since we originally mounted
5021 * the partition.)
5022 */
0390131b
FM		 5023 if (sbi->s_journal)
5024 ext4_clear_journal_err(sb, es);
ac27a0ec 5025 sbi->s_mount_state = le16_to_cpu(es->s_state);
2b2d6d01 5026 if (!ext4_setup_super(sb, es, 0))
ac27a0ec 5027 sb->s_flags &= ~MS_RDONLY;
c5e06d10
JL		 5028 if (EXT4_HAS_INCOMPAT_FEATURE(sb,
5029 EXT4_FEATURE_INCOMPAT_MMP))
5030 if (ext4_multi_mount_protect(sb,
5031 le64_to_cpu(es->s_mmp_block))) {
5032 err = -EROFS;
5033 goto restore_opts;
5034 }
c79d967d 5035 enable_quota = 1;
ac27a0ec
DK		 5036 }
5037 }
bfff6873
LC		 5038
5039 /*
5040 * Reinitialize lazy itable initialization thread based on
5041 * current settings
5042 */
5043 if ((sb->s_flags & MS_RDONLY) || !test_opt(sb, INIT_INODE_TABLE))
5044 ext4_unregister_li_request(sb);
5045 else {
5046 ext4_group_t first_not_zeroed;
5047 first_not_zeroed = ext4_has_uninit_itable(sb);
5048 ext4_register_li_request(sb, first_not_zeroed);
5049 }
5050
6fd058f7 5051 ext4_setup_system_zone(sb);
d096ad0f 5052 if (sbi->s_journal == NULL && !(old_sb_flags & MS_RDONLY))
e2d67052 5053 ext4_commit_super(sb, 1);
0390131b 5054
ac27a0ec
DK		 5055#ifdef CONFIG_QUOTA
5056 /* Release old quota file names */
a2d4a646 5057 for (i = 0; i < EXT4_MAXQUOTAS; i++)
03dafb5f 5058 kfree(old_opts.s_qf_names[i]);
7c319d32
AK		 5059 if (enable_quota) {
5060 if (sb_any_quota_suspended(sb))
5061 dquot_resume(sb, -1);
5062 else if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
5063 EXT4_FEATURE_RO_COMPAT_QUOTA)) {
5064 err = ext4_enable_quotas(sb);
07724f98 5065 if (err)
7c319d32 5066 goto restore_opts;
7c319d32
AK		 5067 }
5068 }
ac27a0ec 5069#endif
d4c402d9 5070
a26f4992 5071 *flags = (*flags & ~MS_LAZYTIME) | (sb->s_flags & MS_LAZYTIME);
d4c402d9
CW		 5072 ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s", orig_data);
5073 kfree(orig_data);
ac27a0ec 5074 return 0;
0b8e58a1 5075
ac27a0ec
DK		 5076restore_opts:
5077 sb->s_flags = old_sb_flags;
5078 sbi->s_mount_opt = old_opts.s_mount_opt;
a2595b8a 5079 sbi->s_mount_opt2 = old_opts.s_mount_opt2;
ac27a0ec
DK		 5080 sbi->s_resuid = old_opts.s_resuid;
5081 sbi->s_resgid = old_opts.s_resgid;
5082 sbi->s_commit_interval = old_opts.s_commit_interval;
30773840
TT		 5083 sbi->s_min_batch_time = old_opts.s_min_batch_time;
5084 sbi->s_max_batch_time = old_opts.s_max_batch_time;
ac27a0ec
DK		 5085#ifdef CONFIG_QUOTA
5086 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
a2d4a646 5087 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
03dafb5f 5088 kfree(sbi->s_qf_names[i]);
ac27a0ec
DK		 5089 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
5090 }
5091#endif
d4c402d9 5092 kfree(orig_data);
ac27a0ec
DK		 5093 return err;
5094}
5095
2b2d6d01 5096static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
ac27a0ec
DK		 5097{
5098 struct super_block *sb = dentry->d_sb;
617ba13b
MC		 5099 struct ext4_sb_info *sbi = EXT4_SB(sb);
5100 struct ext4_super_block *es = sbi->s_es;
27dd4385 5101 ext4_fsblk_t overhead = 0, resv_blocks;
960cc398 5102 u64 fsid;
d02a9391 5103 s64 bfree;
27dd4385 5104 resv_blocks = EXT4_C2B(sbi, atomic64_read(&sbi->s_resv_clusters));
ac27a0ec 5105
952fc18e
TT		 5106 if (!test_opt(sb, MINIX_DF))
5107 overhead = sbi->s_overhead;
ac27a0ec 5108
617ba13b 5109 buf->f_type = EXT4_SUPER_MAGIC;
ac27a0ec 5110 buf->f_bsize = sb->s_blocksize;
b72f78cb 5111 buf->f_blocks = ext4_blocks_count(es) - EXT4_C2B(sbi, overhead);
57042651
TT		 5112 bfree = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) -
5113 percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter);
d02a9391 5114 /* prevent underflow in case that few free space is available */
57042651 5115 buf->f_bfree = EXT4_C2B(sbi, max_t(s64, bfree, 0));
27dd4385
LC		 5116 buf->f_bavail = buf->f_bfree -
5117 (ext4_r_blocks_count(es) + resv_blocks);
5118 if (buf->f_bfree < (ext4_r_blocks_count(es) + resv_blocks))
ac27a0ec
DK		 5119 buf->f_bavail = 0;
5120 buf->f_files = le32_to_cpu(es->s_inodes_count);
52d9f3b4 5121 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
617ba13b 5122 buf->f_namelen = EXT4_NAME_LEN;
960cc398
PE		 5123 fsid = le64_to_cpup((void *)es->s_uuid) ^
5124 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
5125 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
5126 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
0b8e58a1 5127
ac27a0ec
DK		 5128 return 0;
5129}
5130
0b8e58a1
AD		 5131/* Helper function for writing quotas on sync - we need to start transaction
5132 * before quota file is locked for write. Otherwise the are possible deadlocks:
ac27a0ec 5133 * Process 1 Process 2
617ba13b 5134 * ext4_create() quota_sync()
a269eb18 5135 * jbd2_journal_start() write_dquot()
871a2931 5136 * dquot_initialize() down(dqio_mutex)
dab291af 5137 * down(dqio_mutex) jbd2_journal_start()
ac27a0ec
DK		 5138 *
5139 */
5140
5141#ifdef CONFIG_QUOTA
5142
5143static inline struct inode *dquot_to_inode(struct dquot *dquot)
5144{
4c376dca 5145 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_id.type];
ac27a0ec
DK		 5146}
5147
617ba13b 5148static int ext4_write_dquot(struct dquot *dquot)
ac27a0ec
DK		 5149{
5150 int ret, err;
5151 handle_t *handle;
5152 struct inode *inode;
5153
5154 inode = dquot_to_inode(dquot);
9924a92a 5155 handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
0b8e58a1 5156 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 5157 if (IS_ERR(handle))
5158 return PTR_ERR(handle);
5159 ret = dquot_commit(dquot);
617ba13b 5160 err = ext4_journal_stop(handle);
ac27a0ec
DK		 5161 if (!ret)
5162 ret = err;
5163 return ret;
5164}
5165
617ba13b 5166static int ext4_acquire_dquot(struct dquot *dquot)
ac27a0ec
DK		 5167{
5168 int ret, err;
5169 handle_t *handle;
5170
9924a92a 5171 handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
0b8e58a1 5172 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 5173 if (IS_ERR(handle))
5174 return PTR_ERR(handle);
5175 ret = dquot_acquire(dquot);
617ba13b 5176 err = ext4_journal_stop(handle);
ac27a0ec
DK		 5177 if (!ret)
5178 ret = err;
5179 return ret;
5180}
5181
617ba13b 5182static int ext4_release_dquot(struct dquot *dquot)
ac27a0ec
DK		 5183{
5184 int ret, err;
5185 handle_t *handle;
5186
9924a92a 5187 handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
0b8e58a1 5188 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
9c3013e9
JK		 5189 if (IS_ERR(handle)) {
5190 /* Release dquot anyway to avoid endless cycle in dqput() */
5191 dquot_release(dquot);
ac27a0ec 5192 return PTR_ERR(handle);
9c3013e9 5193 }
ac27a0ec 5194 ret = dquot_release(dquot);
617ba13b 5195 err = ext4_journal_stop(handle);
ac27a0ec
DK		 5196 if (!ret)
5197 ret = err;
5198 return ret;
5199}
5200
617ba13b 5201static int ext4_mark_dquot_dirty(struct dquot *dquot)
ac27a0ec 5202{
262b4662
JK		 5203 struct super_block *sb = dquot->dq_sb;
5204 struct ext4_sb_info *sbi = EXT4_SB(sb);
5205
2c8be6b2 5206 /* Are we journaling quotas? */
262b4662
JK		 5207 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) ||
5208 sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
ac27a0ec 5209 dquot_mark_dquot_dirty(dquot);
617ba13b 5210 return ext4_write_dquot(dquot);
ac27a0ec
DK		 5211 } else {
5212 return dquot_mark_dquot_dirty(dquot);
5213 }
5214}
5215
617ba13b 5216static int ext4_write_info(struct super_block *sb, int type)
ac27a0ec
DK		 5217{
5218 int ret, err;
5219 handle_t *handle;
5220
5221 /* Data block + inode block */
2b0143b5 5222 handle = ext4_journal_start(d_inode(sb->s_root), EXT4_HT_QUOTA, 2);
ac27a0ec
DK		 5223 if (IS_ERR(handle))
5224 return PTR_ERR(handle);
5225 ret = dquot_commit_info(sb, type);
617ba13b 5226 err = ext4_journal_stop(handle);
ac27a0ec
DK		 5227 if (!ret)
5228 ret = err;
5229 return ret;
5230}
5231
5232/*
5233 * Turn on quotas during mount time - we need to find
5234 * the quota file and such...
5235 */
617ba13b 5236static int ext4_quota_on_mount(struct super_block *sb, int type)
ac27a0ec 5237{
287a8095
CH		 5238 return dquot_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
5239 EXT4_SB(sb)->s_jquota_fmt, type);
ac27a0ec
DK		 5240}
5241
5242/*
5243 * Standard function to be called on quota_on
5244 */
617ba13b 5245static int ext4_quota_on(struct super_block *sb, int type, int format_id,
f00c9e44 5246 struct path *path)
ac27a0ec
DK		 5247{
5248 int err;
ac27a0ec
DK		 5249
5250 if (!test_opt(sb, QUOTA))
5251 return -EINVAL;
0623543b 5252
ac27a0ec 5253 /* Quotafile not on the same filesystem? */
d8c9584e 5254 if (path->dentry->d_sb != sb)
ac27a0ec 5255 return -EXDEV;
0623543b
JK		 5256 /* Journaling quota? */
5257 if (EXT4_SB(sb)->s_qf_names[type]) {
2b2d6d01 5258 /* Quotafile not in fs root? */
f00c9e44 5259 if (path->dentry->d_parent != sb->s_root)
b31e1552
ES		 5260 ext4_msg(sb, KERN_WARNING,
5261 "Quota file not on filesystem root. "
5262 "Journaled quota will not work");
2b2d6d01 5263 }
0623543b
JK		 5264
5265 /*
5266 * When we journal data on quota file, we have to flush journal to see
5267 * all updates to the file when we bypass pagecache...
5268 */
0390131b 5269 if (EXT4_SB(sb)->s_journal &&
2b0143b5 5270 ext4_should_journal_data(d_inode(path->dentry))) {
0623543b
JK		 5271 /*
5272 * We don't need to lock updates but journal_flush() could
5273 * otherwise be livelocked...
5274 */
5275 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
7ffe1ea8 5276 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
0623543b 5277 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
f00c9e44 5278 if (err)
7ffe1ea8 5279 return err;
0623543b
JK		 5280 }
5281
f00c9e44 5282 return dquot_quota_on(sb, type, format_id, path);
ac27a0ec
DK		 5283}
5284
7c319d32
AK		 5285static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
5286 unsigned int flags)
5287{
5288 int err;
5289 struct inode *qf_inode;
a2d4a646 5290 unsigned long qf_inums[EXT4_MAXQUOTAS] = {
7c319d32
AK		 5291 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
5292 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum)
5293 };
5294
5295 BUG_ON(!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA));
5296
5297 if (!qf_inums[type])
5298 return -EPERM;
5299
5300 qf_inode = ext4_iget(sb, qf_inums[type]);
5301 if (IS_ERR(qf_inode)) {
5302 ext4_error(sb, "Bad quota inode # %lu", qf_inums[type]);
5303 return PTR_ERR(qf_inode);
5304 }
5305
bcb13850
JK		 5306 /* Don't account quota for quota files to avoid recursion */
5307 qf_inode->i_flags |= S_NOQUOTA;
7c319d32
AK		 5308 err = dquot_enable(qf_inode, type, format_id, flags);
5309 iput(qf_inode);
5310
5311 return err;
5312}
5313
5314/* Enable usage tracking for all quota types. */
5315static int ext4_enable_quotas(struct super_block *sb)
5316{
5317 int type, err = 0;
a2d4a646 5318 unsigned long qf_inums[EXT4_MAXQUOTAS] = {
7c319d32
AK		 5319 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
5320 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum)
5321 };
5322
5323 sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE;
a2d4a646 5324 for (type = 0; type < EXT4_MAXQUOTAS; type++) {
7c319d32
AK		 5325 if (qf_inums[type]) {
5326 err = ext4_quota_enable(sb, type, QFMT_VFS_V1,
5327 DQUOT_USAGE_ENABLED);
5328 if (err) {
5329 ext4_warning(sb,
72ba7450
TT		 5330 "Failed to enable quota tracking "
5331 "(type=%d, err=%d). Please run "
5332 "e2fsck to fix.", type, err);
7c319d32
AK		 5333 return err;
5334 }
5335 }
5336 }
5337 return 0;
5338}
5339
ca0e05e4
DM		 5340static int ext4_quota_off(struct super_block *sb, int type)
5341{
21f97697
JK		 5342 struct inode *inode = sb_dqopt(sb)->files[type];
5343 handle_t *handle;
5344
87009d86
DM		 5345 /* Force all delayed allocation blocks to be allocated.
5346 * Caller already holds s_umount sem */
5347 if (test_opt(sb, DELALLOC))
ca0e05e4 5348 sync_filesystem(sb);
ca0e05e4 5349
0b268590
AG		 5350 if (!inode)
5351 goto out;
5352
21f97697
JK		 5353 /* Update modification times of quota files when userspace can
5354 * start looking at them */
9924a92a 5355 handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1);
21f97697
JK		 5356 if (IS_ERR(handle))
5357 goto out;
5358 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
5359 ext4_mark_inode_dirty(handle, inode);
5360 ext4_journal_stop(handle);
5361
5362out:
ca0e05e4
DM		 5363 return dquot_quota_off(sb, type);
5364}
5365
ac27a0ec
DK		 5366/* Read data from quotafile - avoid pagecache and such because we cannot afford
5367 * acquiring the locks... As quota files are never truncated and quota code
25985edc 5368 * itself serializes the operations (and no one else should touch the files)
ac27a0ec 5369 * we don't have to be afraid of races */
617ba13b 5370static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec
DK		 5371 size_t len, loff_t off)
5372{
5373 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 5374 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 5375 int offset = off & (sb->s_blocksize - 1);
5376 int tocopy;
5377 size_t toread;
5378 struct buffer_head *bh;
5379 loff_t i_size = i_size_read(inode);
5380
5381 if (off > i_size)
5382 return 0;
5383 if (off+len > i_size)
5384 len = i_size-off;
5385 toread = len;
5386 while (toread > 0) {
5387 tocopy = sb->s_blocksize - offset < toread ?
5388 sb->s_blocksize - offset : toread;
1c215028
TT		 5389 bh = ext4_bread(NULL, inode, blk, 0);
5390 if (IS_ERR(bh))
5391 return PTR_ERR(bh);
ac27a0ec
DK		 5392 if (!bh) /* A hole? */
5393 memset(data, 0, tocopy);
5394 else
5395 memcpy(data, bh->b_data+offset, tocopy);
5396 brelse(bh);
5397 offset = 0;
5398 toread -= tocopy;
5399 data += tocopy;
5400 blk++;
5401 }
5402 return len;
5403}
5404
5405/* Write to quotafile (we know the transaction is already started and has
5406 * enough credits) */
617ba13b 5407static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec
DK		 5408 const char *data, size_t len, loff_t off)
5409{
5410 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 5411 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
1c215028 5412 int err, offset = off & (sb->s_blocksize - 1);
ac27a0ec
DK		 5413 struct buffer_head *bh;
5414 handle_t *handle = journal_current_handle();
5415
0390131b 5416 if (EXT4_SB(sb)->s_journal && !handle) {
b31e1552
ES		 5417 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
5418 " cancelled because transaction is not started",
9c3013e9
JK		 5419 (unsigned long long)off, (unsigned long long)len);
5420 return -EIO;
5421 }
67eeb568
DM		 5422 /*
5423 * Since we account only one data block in transaction credits,
5424 * then it is impossible to cross a block boundary.
5425 */
5426 if (sb->s_blocksize - offset < len) {
5427 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
5428 " cancelled because not block aligned",
5429 (unsigned long long)off, (unsigned long long)len);
5430 return -EIO;
5431 }
5432
1c215028
TT		 5433 bh = ext4_bread(handle, inode, blk, 1);
5434 if (IS_ERR(bh))
5435 return PTR_ERR(bh);
67eeb568
DM		 5436 if (!bh)
5437 goto out;
5d601255 5438 BUFFER_TRACE(bh, "get write access");
62d2b5f2
JK		 5439 err = ext4_journal_get_write_access(handle, bh);
5440 if (err) {
5441 brelse(bh);
1c215028 5442 return err;
ac27a0ec 5443 }
67eeb568
DM		 5444 lock_buffer(bh);
5445 memcpy(bh->b_data+offset, data, len);
5446 flush_dcache_page(bh->b_page);
5447 unlock_buffer(bh);
62d2b5f2 5448 err = ext4_handle_dirty_metadata(handle, NULL, bh);
67eeb568 5449 brelse(bh);
ac27a0ec 5450out:
67eeb568
DM		 5451 if (inode->i_size < off + len) {
5452 i_size_write(inode, off + len);
617ba13b 5453 EXT4_I(inode)->i_disksize = inode->i_size;
21f97697 5454 ext4_mark_inode_dirty(handle, inode);
ac27a0ec 5455 }
67eeb568 5456 return len;
ac27a0ec
DK		 5457}
5458
5459#endif
5460
152a0836
AV		 5461static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
5462 const char *dev_name, void *data)
ac27a0ec 5463{
152a0836 5464 return mount_bdev(fs_type, flags, dev_name, data, ext4_fill_super);
ac27a0ec
DK		 5465}
5466
37f328eb 5467#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
24b58424
TT		 5468static inline void register_as_ext2(void)
5469{
5470 int err = register_filesystem(&ext2_fs_type);
5471 if (err)
5472 printk(KERN_WARNING
5473 "EXT4-fs: Unable to register as ext2 (%d)\n", err);
5474}
5475
5476static inline void unregister_as_ext2(void)
5477{
5478 unregister_filesystem(&ext2_fs_type);
5479}
2035e776
TT		 5480
5481static inline int ext2_feature_set_ok(struct super_block *sb)
5482{
5483 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP))
5484 return 0;
5485 if (sb->s_flags & MS_RDONLY)
5486 return 1;
5487 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))
5488 return 0;
5489 return 1;
5490}
24b58424
TT		 5491#else
5492static inline void register_as_ext2(void) { }
5493static inline void unregister_as_ext2(void) { }
2035e776 5494static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; }
24b58424
TT		 5495#endif
5496
37f328eb 5497#if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
24b58424
TT		 5498static inline void register_as_ext3(void)
5499{
5500 int err = register_filesystem(&ext3_fs_type);
5501 if (err)
5502 printk(KERN_WARNING
5503 "EXT4-fs: Unable to register as ext3 (%d)\n", err);
5504}
5505
5506static inline void unregister_as_ext3(void)
5507{
5508 unregister_filesystem(&ext3_fs_type);
5509}
2035e776
TT		 5510
5511static inline int ext3_feature_set_ok(struct super_block *sb)
5512{
5513 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP))
5514 return 0;
5515 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
5516 return 0;
5517 if (sb->s_flags & MS_RDONLY)
5518 return 1;
5519 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP))
5520 return 0;
5521 return 1;
5522}
24b58424
TT		 5523#else
5524static inline void register_as_ext3(void) { }
5525static inline void unregister_as_ext3(void) { }
2035e776 5526static inline int ext3_feature_set_ok(struct super_block *sb) { return 0; }
24b58424
TT		 5527#endif
5528
03010a33
TT		 5529static struct file_system_type ext4_fs_type = {
5530 .owner = THIS_MODULE,
5531 .name = "ext4",
152a0836 5532 .mount = ext4_mount,
03010a33
TT		 5533 .kill_sb = kill_block_super,
5534 .fs_flags = FS_REQUIRES_DEV,
5535};
7f78e035 5536MODULE_ALIAS_FS("ext4");
03010a33 5537
8f021222 5538static int __init ext4_init_feat_adverts(void)
857ac889
LC		 5539{
5540 struct ext4_features *ef;
5541 int ret = -ENOMEM;
5542
5543 ef = kzalloc(sizeof(struct ext4_features), GFP_KERNEL);
5544 if (!ef)
5545 goto out;
5546
5547 ef->f_kobj.kset = ext4_kset;
5548 init_completion(&ef->f_kobj_unregister);
5549 ret = kobject_init_and_add(&ef->f_kobj, &ext4_feat_ktype, NULL,
5550 "features");
5551 if (ret) {
5552 kfree(ef);
5553 goto out;
5554 }
5555
5556 ext4_feat = ef;
5557 ret = 0;
5558out:
5559 return ret;
5560}
5561
8f021222
LC		 5562static void ext4_exit_feat_adverts(void)
5563{
5564 kobject_put(&ext4_feat->f_kobj);
5565 wait_for_completion(&ext4_feat->f_kobj_unregister);
5566 kfree(ext4_feat);
5567}
5568
e9e3bcec
ES		 5569/* Shared across all ext4 file systems */
5570wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
5571struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ];
5572
5dabfc78 5573static int __init ext4_init_fs(void)
ac27a0ec 5574{
e9e3bcec 5575 int i, err;
c9de560d 5576
07c0c5d8
AV		 5577 ext4_li_info = NULL;
5578 mutex_init(&ext4_li_mtx);
5579
9a4c8019 5580 /* Build-time check for flags consistency */
12e9b892 5581 ext4_check_flag_values();
e9e3bcec
ES		 5582
5583 for (i = 0; i < EXT4_WQ_HASH_SZ; i++) {
5584 mutex_init(&ext4__aio_mutex[i]);
5585 init_waitqueue_head(&ext4__ioend_wq[i]);
5586 }
5587
51865fda 5588 err = ext4_init_es();
6fd058f7
TT		 5589 if (err)
5590 return err;
51865fda
ZL		 5591
5592 err = ext4_init_pageio();
5593 if (err)
5594 goto out7;
5595
5dabfc78 5596 err = ext4_init_system_zone();
bd2d0210 5597 if (err)
d44651d0 5598 goto out6;
3197ebdb 5599 ext4_kset = kset_create_and_add("ext4", NULL, fs_kobj);
0e376b1e
TT		 5600 if (!ext4_kset) {
5601 err = -ENOMEM;
dd68314c 5602 goto out5;
0e376b1e 5603 }
d44651d0 5604 ext4_proc_root = proc_mkdir("fs/ext4", NULL);
857ac889
LC		 5605
5606 err = ext4_init_feat_adverts();
dd68314c
TT		 5607 if (err)
5608 goto out4;
857ac889 5609
5dabfc78 5610 err = ext4_init_mballoc();
c9de560d
AT		 5611 if (err)
5612 goto out2;
9c191f70
M		 5613 else
5614 ext4_mballoc_ready = 1;
ac27a0ec
DK		 5615 err = init_inodecache();
5616 if (err)
5617 goto out1;
24b58424 5618 register_as_ext3();
2035e776 5619 register_as_ext2();
03010a33 5620 err = register_filesystem(&ext4_fs_type);
ac27a0ec
DK		 5621 if (err)
5622 goto out;
bfff6873 5623
ac27a0ec
DK		 5624 return 0;
5625out:
24b58424
TT		 5626 unregister_as_ext2();
5627 unregister_as_ext3();
ac27a0ec
DK		 5628 destroy_inodecache();
5629out1:
9c191f70 5630 ext4_mballoc_ready = 0;
5dabfc78 5631 ext4_exit_mballoc();
9c191f70 5632out2:
8f021222 5633 ext4_exit_feat_adverts();
dd68314c 5634out4:
d44651d0
FJ		 5635 if (ext4_proc_root)
5636 remove_proc_entry("fs/ext4", NULL);
6fd058f7 5637 kset_unregister(ext4_kset);
d44651d0 5638out5:
5dabfc78 5639 ext4_exit_system_zone();
d44651d0 5640out6:
5dabfc78 5641 ext4_exit_pageio();
51865fda
ZL		 5642out7:
5643 ext4_exit_es();
5644
ac27a0ec
DK		 5645 return err;
5646}
5647
5dabfc78 5648static void __exit ext4_exit_fs(void)
ac27a0ec 5649{
bfff6873 5650 ext4_destroy_lazyinit_thread();
24b58424
TT		 5651 unregister_as_ext2();
5652 unregister_as_ext3();
03010a33 5653 unregister_filesystem(&ext4_fs_type);
ac27a0ec 5654 destroy_inodecache();
5dabfc78 5655 ext4_exit_mballoc();
8f021222 5656 ext4_exit_feat_adverts();
9f6200bb 5657 remove_proc_entry("fs/ext4", NULL);
3197ebdb 5658 kset_unregister(ext4_kset);
5dabfc78
TT		 5659 ext4_exit_system_zone();
5660 ext4_exit_pageio();
dd12ed14 5661 ext4_exit_es();
ac27a0ec
DK		 5662}
5663
5664MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
83982b6f 5665MODULE_DESCRIPTION("Fourth Extended Filesystem");
ac27a0ec 5666MODULE_LICENSE("GPL");
5dabfc78
TT		 5667module_init(ext4_init_fs)
5668module_exit(ext4_exit_fs)
Empty description
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