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Merge tag 'for-4.18-rc2-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave...
[linux-block.git] / fs / ext4 / super.c
CommitLineData
f5166768 1// SPDX-License-Identifier: GPL-2.0
ac27a0ec 2/*
617ba13b 3 * linux/fs/ext4/super.c
ac27a0ec
DK		 4 *
5 * Copyright (C) 1992, 1993, 1994, 1995
6 * Remy Card (card@masi.ibp.fr)
7 * Laboratoire MASI - Institut Blaise Pascal
8 * Universite Pierre et Marie Curie (Paris VI)
9 *
10 * from
11 *
12 * linux/fs/minix/inode.c
13 *
14 * Copyright (C) 1991, 1992 Linus Torvalds
15 *
16 * Big-endian to little-endian byte-swapping/bitmaps by
17 * David S. Miller (davem@caip.rutgers.edu), 1995
18 */
19
20#include <linux/module.h>
21#include <linux/string.h>
22#include <linux/fs.h>
23#include <linux/time.h>
c5ca7c76 24#include <linux/vmalloc.h>
ac27a0ec
DK		 25#include <linux/slab.h>
26#include <linux/init.h>
27#include <linux/blkdev.h>
66114cad 28#include <linux/backing-dev.h>
ac27a0ec 29#include <linux/parser.h>
ac27a0ec 30#include <linux/buffer_head.h>
a5694255 31#include <linux/exportfs.h>
ac27a0ec
DK		 32#include <linux/vfs.h>
33#include <linux/random.h>
34#include <linux/mount.h>
35#include <linux/namei.h>
36#include <linux/quotaops.h>
37#include <linux/seq_file.h>
3197ebdb 38#include <linux/ctype.h>
1330593e 39#include <linux/log2.h>
717d50e4 40#include <linux/crc16.h>
ef510424 41#include <linux/dax.h>
7abc52c2 42#include <linux/cleancache.h>
7c0f6ba6 43#include <linux/uaccess.h>
ee73f9a5 44#include <linux/iversion.h>
ac27a0ec 45
bfff6873
LC		 46#include <linux/kthread.h>
47#include <linux/freezer.h>
48
3dcf5451 49#include "ext4.h"
4a092d73 50#include "ext4_extents.h" /* Needed for trace points definition */
3dcf5451 51#include "ext4_jbd2.h"
ac27a0ec
DK		 52#include "xattr.h"
53#include "acl.h"
3661d286 54#include "mballoc.h"
0c9ec4be 55#include "fsmap.h"
ac27a0ec 56
9bffad1e
TT		 57#define CREATE_TRACE_POINTS
58#include <trace/events/ext4.h>
59
0b75a840
LC		 60static struct ext4_lazy_init *ext4_li_info;
61static struct mutex ext4_li_mtx;
e294a537 62static struct ratelimit_state ext4_mount_msg_ratelimit;
9f6200bb 63
617ba13b 64static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
ac27a0ec 65 unsigned long journal_devnum);
2adf6da8 66static int ext4_show_options(struct seq_file *seq, struct dentry *root);
e2d67052 67static int ext4_commit_super(struct super_block *sb, int sync);
2b2d6d01
TT		 68static void ext4_mark_recovery_complete(struct super_block *sb,
69 struct ext4_super_block *es);
70static void ext4_clear_journal_err(struct super_block *sb,
71 struct ext4_super_block *es);
617ba13b 72static int ext4_sync_fs(struct super_block *sb, int wait);
2b2d6d01
TT		 73static int ext4_remount(struct super_block *sb, int *flags, char *data);
74static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
c4be0c1d 75static int ext4_unfreeze(struct super_block *sb);
c4be0c1d 76static int ext4_freeze(struct super_block *sb);
152a0836
AV		 77static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
78 const char *dev_name, void *data);
2035e776
TT		 79static inline int ext2_feature_set_ok(struct super_block *sb);
80static inline int ext3_feature_set_ok(struct super_block *sb);
d39195c3 81static int ext4_feature_set_ok(struct super_block *sb, int readonly);
bfff6873
LC		 82static void ext4_destroy_lazyinit_thread(void);
83static void ext4_unregister_li_request(struct super_block *sb);
8f1f7453 84static void ext4_clear_request_list(void);
c6cb7e77
EW		 85static struct inode *ext4_get_journal_inode(struct super_block *sb,
86 unsigned int journal_inum);
ac27a0ec 87
e74031fd
JK		 88/*
89 * Lock ordering
90 *
91 * Note the difference between i_mmap_sem (EXT4_I(inode)->i_mmap_sem) and
92 * i_mmap_rwsem (inode->i_mmap_rwsem)!
93 *
94 * page fault path:
95 * mmap_sem -> sb_start_pagefault -> i_mmap_sem (r) -> transaction start ->
96 * page lock -> i_data_sem (rw)
97 *
98 * buffered write path:
99 * sb_start_write -> i_mutex -> mmap_sem
100 * sb_start_write -> i_mutex -> transaction start -> page lock ->
101 * i_data_sem (rw)
102 *
103 * truncate:
1d39834f
NB		 104 * sb_start_write -> i_mutex -> i_mmap_sem (w) -> i_mmap_rwsem (w) -> page lock
105 * sb_start_write -> i_mutex -> i_mmap_sem (w) -> transaction start ->
106 * i_data_sem (rw)
e74031fd
JK		 107 *
108 * direct IO:
1d39834f
NB		 109 * sb_start_write -> i_mutex -> mmap_sem
110 * sb_start_write -> i_mutex -> transaction start -> i_data_sem (rw)
e74031fd
JK		 111 *
112 * writepages:
113 * transaction start -> page lock(s) -> i_data_sem (rw)
114 */
115
c290ea01 116#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2)
2035e776
TT		 117static struct file_system_type ext2_fs_type = {
118 .owner = THIS_MODULE,
119 .name = "ext2",
120 .mount = ext4_mount,
121 .kill_sb = kill_block_super,
122 .fs_flags = FS_REQUIRES_DEV,
123};
7f78e035 124MODULE_ALIAS_FS("ext2");
fa7614dd 125MODULE_ALIAS("ext2");
2035e776
TT		 126#define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type)
127#else
128#define IS_EXT2_SB(sb) (0)
129#endif
130
131
ba69f9ab
JK		 132static struct file_system_type ext3_fs_type = {
133 .owner = THIS_MODULE,
134 .name = "ext3",
152a0836 135 .mount = ext4_mount,
ba69f9ab
JK		 136 .kill_sb = kill_block_super,
137 .fs_flags = FS_REQUIRES_DEV,
138};
7f78e035 139MODULE_ALIAS_FS("ext3");
fa7614dd 140MODULE_ALIAS("ext3");
ba69f9ab 141#define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type)
bd81d8ee 142
d25425f8
DW		 143static int ext4_verify_csum_type(struct super_block *sb,
144 struct ext4_super_block *es)
145{
e2b911c5 146 if (!ext4_has_feature_metadata_csum(sb))
d25425f8
DW		 147 return 1;
148
149 return es->s_checksum_type == EXT4_CRC32C_CHKSUM;
150}
151
a9c47317
DW		 152static __le32 ext4_superblock_csum(struct super_block *sb,
153 struct ext4_super_block *es)
154{
155 struct ext4_sb_info *sbi = EXT4_SB(sb);
156 int offset = offsetof(struct ext4_super_block, s_checksum);
157 __u32 csum;
158
159 csum = ext4_chksum(sbi, ~0, (char *)es, offset);
160
161 return cpu_to_le32(csum);
162}
163
c197855e
SH		 164static int ext4_superblock_csum_verify(struct super_block *sb,
165 struct ext4_super_block *es)
a9c47317 166{
9aa5d32b 167 if (!ext4_has_metadata_csum(sb))
a9c47317
DW		 168 return 1;
169
170 return es->s_checksum == ext4_superblock_csum(sb, es);
171}
172
06db49e6 173void ext4_superblock_csum_set(struct super_block *sb)
a9c47317 174{
06db49e6
TT		 175 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
176
9aa5d32b 177 if (!ext4_has_metadata_csum(sb))
a9c47317
DW		 178 return;
179
180 es->s_checksum = ext4_superblock_csum(sb, es);
181}
182
9933fc0a
TT		 183void *ext4_kvmalloc(size_t size, gfp_t flags)
184{
185 void *ret;
186
8be04b93 187 ret = kmalloc(size, flags | __GFP_NOWARN);
9933fc0a
TT		 188 if (!ret)
189 ret = __vmalloc(size, flags, PAGE_KERNEL);
190 return ret;
191}
192
193void *ext4_kvzalloc(size_t size, gfp_t flags)
194{
195 void *ret;
196
8be04b93 197 ret = kzalloc(size, flags | __GFP_NOWARN);
9933fc0a
TT		 198 if (!ret)
199 ret = __vmalloc(size, flags | __GFP_ZERO, PAGE_KERNEL);
200 return ret;
201}
202
8fadc143
AR		 203ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
204 struct ext4_group_desc *bg)
bd81d8ee 205{
3a14589c 206 return le32_to_cpu(bg->bg_block_bitmap_lo) |
8fadc143 207 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 208 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 209}
210
8fadc143
AR		 211ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
212 struct ext4_group_desc *bg)
bd81d8ee 213{
5272f837 214 return le32_to_cpu(bg->bg_inode_bitmap_lo) |
8fadc143 215 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 216 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 217}
218
8fadc143
AR		 219ext4_fsblk_t ext4_inode_table(struct super_block *sb,
220 struct ext4_group_desc *bg)
bd81d8ee 221{
5272f837 222 return le32_to_cpu(bg->bg_inode_table_lo) |
8fadc143 223 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 224 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
bd81d8ee
LV		 225}
226
021b65bb
TT		 227__u32 ext4_free_group_clusters(struct super_block *sb,
228 struct ext4_group_desc *bg)
560671a0
AK		 229{
230 return le16_to_cpu(bg->bg_free_blocks_count_lo) |
231 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 232 (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0);
560671a0
AK		 233}
234
235__u32 ext4_free_inodes_count(struct super_block *sb,
236 struct ext4_group_desc *bg)
237{
238 return le16_to_cpu(bg->bg_free_inodes_count_lo) |
239 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 240 (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0);
560671a0
AK		 241}
242
243__u32 ext4_used_dirs_count(struct super_block *sb,
244 struct ext4_group_desc *bg)
245{
246 return le16_to_cpu(bg->bg_used_dirs_count_lo) |
247 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 248 (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0);
560671a0
AK		 249}
250
251__u32 ext4_itable_unused_count(struct super_block *sb,
252 struct ext4_group_desc *bg)
253{
254 return le16_to_cpu(bg->bg_itable_unused_lo) |
255 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 256 (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0);
560671a0
AK		 257}
258
8fadc143
AR		 259void ext4_block_bitmap_set(struct super_block *sb,
260 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 261{
3a14589c 262 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 263 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
264 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 265}
266
8fadc143
AR		 267void ext4_inode_bitmap_set(struct super_block *sb,
268 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 269{
5272f837 270 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 271 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
272 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 273}
274
8fadc143
AR		 275void ext4_inode_table_set(struct super_block *sb,
276 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 277{
5272f837 278 bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 279 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
280 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 281}
282
021b65bb
TT		 283void ext4_free_group_clusters_set(struct super_block *sb,
284 struct ext4_group_desc *bg, __u32 count)
560671a0
AK		 285{
286 bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count);
287 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
288 bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16);
289}
290
291void ext4_free_inodes_set(struct super_block *sb,
292 struct ext4_group_desc *bg, __u32 count)
293{
294 bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count);
295 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
296 bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16);
297}
298
299void ext4_used_dirs_set(struct super_block *sb,
300 struct ext4_group_desc *bg, __u32 count)
301{
302 bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count);
303 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
304 bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16);
305}
306
307void ext4_itable_unused_set(struct super_block *sb,
308 struct ext4_group_desc *bg, __u32 count)
309{
310 bg->bg_itable_unused_lo = cpu_to_le16((__u16)count);
311 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
312 bg->bg_itable_unused_hi = cpu_to_le16(count >> 16);
313}
314
d3d1faf6 315
1c13d5c0
TT		 316static void __save_error_info(struct super_block *sb, const char *func,
317 unsigned int line)
318{
319 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
320
321 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
1b46617b
TT		 322 if (bdev_read_only(sb->s_bdev))
323 return;
1c13d5c0
TT		 324 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
325 es->s_last_error_time = cpu_to_le32(get_seconds());
326 strncpy(es->s_last_error_func, func, sizeof(es->s_last_error_func));
327 es->s_last_error_line = cpu_to_le32(line);
328 if (!es->s_first_error_time) {
329 es->s_first_error_time = es->s_last_error_time;
330 strncpy(es->s_first_error_func, func,
331 sizeof(es->s_first_error_func));
332 es->s_first_error_line = cpu_to_le32(line);
333 es->s_first_error_ino = es->s_last_error_ino;
334 es->s_first_error_block = es->s_last_error_block;
335 }
66e61a9e
TT		 336 /*
337 * Start the daily error reporting function if it hasn't been
338 * started already
339 */
340 if (!es->s_error_count)
341 mod_timer(&EXT4_SB(sb)->s_err_report, jiffies + 24*60*60*HZ);
ba39ebb6 342 le32_add_cpu(&es->s_error_count, 1);
1c13d5c0
TT		 343}
344
345static void save_error_info(struct super_block *sb, const char *func,
346 unsigned int line)
347{
348 __save_error_info(sb, func, line);
349 ext4_commit_super(sb, 1);
350}
351
bdfe0cbd
TT		 352/*
353 * The del_gendisk() function uninitializes the disk-specific data
354 * structures, including the bdi structure, without telling anyone
355 * else. Once this happens, any attempt to call mark_buffer_dirty()
356 * (for example, by ext4_commit_super), will cause a kernel OOPS.
357 * This is a kludge to prevent these oops until we can put in a proper
358 * hook in del_gendisk() to inform the VFS and file system layers.
359 */
360static int block_device_ejected(struct super_block *sb)
361{
362 struct inode *bd_inode = sb->s_bdev->bd_inode;
363 struct backing_dev_info *bdi = inode_to_bdi(bd_inode);
364
365 return bdi->dev == NULL;
366}
367
18aadd47
BJ		 368static void ext4_journal_commit_callback(journal_t *journal, transaction_t *txn)
369{
370 struct super_block *sb = journal->j_private;
371 struct ext4_sb_info *sbi = EXT4_SB(sb);
372 int error = is_journal_aborted(journal);
5d3ee208 373 struct ext4_journal_cb_entry *jce;
18aadd47 374
5d3ee208 375 BUG_ON(txn->t_state == T_FINISHED);
a0154344
DJ		 376
377 ext4_process_freed_data(sb, txn->t_tid);
378
18aadd47 379 spin_lock(&sbi->s_md_lock);
5d3ee208
DM		 380 while (!list_empty(&txn->t_private_list)) {
381 jce = list_entry(txn->t_private_list.next,
382 struct ext4_journal_cb_entry, jce_list);
18aadd47
BJ		 383 list_del_init(&jce->jce_list);
384 spin_unlock(&sbi->s_md_lock);
385 jce->jce_func(sb, jce, error);
386 spin_lock(&sbi->s_md_lock);
387 }
388 spin_unlock(&sbi->s_md_lock);
389}
1c13d5c0 390
ac27a0ec
DK		 391/* Deal with the reporting of failure conditions on a filesystem such as
392 * inconsistencies detected or read IO failures.
393 *
394 * On ext2, we can store the error state of the filesystem in the
617ba13b 395 * superblock. That is not possible on ext4, because we may have other
ac27a0ec
DK		 396 * write ordering constraints on the superblock which prevent us from
397 * writing it out straight away; and given that the journal is about to
398 * be aborted, we can't rely on the current, or future, transactions to
399 * write out the superblock safely.
400 *
dab291af 401 * We'll just use the jbd2_journal_abort() error code to record an error in
d6b198bc 402 * the journal instead. On recovery, the journal will complain about
ac27a0ec
DK		 403 * that error until we've noted it down and cleared it.
404 */
405
617ba13b 406static void ext4_handle_error(struct super_block *sb)
ac27a0ec 407{
bc98a42c 408 if (sb_rdonly(sb))
ac27a0ec
DK		 409 return;
410
2b2d6d01 411 if (!test_opt(sb, ERRORS_CONT)) {
617ba13b 412 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 413
4ab2f15b 414 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
ac27a0ec 415 if (journal)
dab291af 416 jbd2_journal_abort(journal, -EIO);
ac27a0ec 417 }
2b2d6d01 418 if (test_opt(sb, ERRORS_RO)) {
b31e1552 419 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
4418e141
DM		 420 /*
421 * Make sure updated value of ->s_mount_flags will be visible
422 * before ->s_flags update
423 */
424 smp_wmb();
1751e8a6 425 sb->s_flags |= SB_RDONLY;
ac27a0ec 426 }
4327ba52
DJ		 427 if (test_opt(sb, ERRORS_PANIC)) {
428 if (EXT4_SB(sb)->s_journal &&
429 !(EXT4_SB(sb)->s_journal->j_flags & JBD2_REC_ERR))
430 return;
617ba13b 431 panic("EXT4-fs (device %s): panic forced after error\n",
ac27a0ec 432 sb->s_id);
4327ba52 433 }
ac27a0ec
DK		 434}
435
efbed4dc
TT		 436#define ext4_error_ratelimit(sb) \
437 ___ratelimit(&(EXT4_SB(sb)->s_err_ratelimit_state), \
438 "EXT4-fs error")
439
12062ddd 440void __ext4_error(struct super_block *sb, const char *function,
c398eda0 441 unsigned int line, const char *fmt, ...)
ac27a0ec 442{
0ff2ea7d 443 struct va_format vaf;
ac27a0ec
DK		 444 va_list args;
445
0db1ff22
TT		 446 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
447 return;
448
ccf0f32a 449 trace_ext4_error(sb, function, line);
efbed4dc
TT		 450 if (ext4_error_ratelimit(sb)) {
451 va_start(args, fmt);
452 vaf.fmt = fmt;
453 vaf.va = &args;
454 printk(KERN_CRIT
455 "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n",
456 sb->s_id, function, line, current->comm, &vaf);
457 va_end(args);
458 }
f3fc0210 459 save_error_info(sb, function, line);
617ba13b 460 ext4_handle_error(sb);
ac27a0ec
DK		 461}
462
e7c96e8e
JP		 463void __ext4_error_inode(struct inode *inode, const char *function,
464 unsigned int line, ext4_fsblk_t block,
465 const char *fmt, ...)
273df556
FM		 466{
467 va_list args;
f7c21177 468 struct va_format vaf;
1c13d5c0 469 struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
273df556 470
0db1ff22
TT		 471 if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
472 return;
473
ccf0f32a 474 trace_ext4_error(inode->i_sb, function, line);
1c13d5c0
TT		 475 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
476 es->s_last_error_block = cpu_to_le64(block);
efbed4dc
TT		 477 if (ext4_error_ratelimit(inode->i_sb)) {
478 va_start(args, fmt);
479 vaf.fmt = fmt;
480 vaf.va = &args;
481 if (block)
482 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
483 "inode #%lu: block %llu: comm %s: %pV\n",
484 inode->i_sb->s_id, function, line, inode->i_ino,
485 block, current->comm, &vaf);
486 else
487 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
488 "inode #%lu: comm %s: %pV\n",
489 inode->i_sb->s_id, function, line, inode->i_ino,
490 current->comm, &vaf);
491 va_end(args);
492 }
1c13d5c0 493 save_error_info(inode->i_sb, function, line);
273df556
FM		 494 ext4_handle_error(inode->i_sb);
495}
496
e7c96e8e
JP		 497void __ext4_error_file(struct file *file, const char *function,
498 unsigned int line, ext4_fsblk_t block,
499 const char *fmt, ...)
273df556
FM		 500{
501 va_list args;
f7c21177 502 struct va_format vaf;
1c13d5c0 503 struct ext4_super_block *es;
496ad9aa 504 struct inode *inode = file_inode(file);
273df556
FM		 505 char pathname[80], *path;
506
0db1ff22
TT		 507 if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
508 return;
509
ccf0f32a 510 trace_ext4_error(inode->i_sb, function, line);
1c13d5c0
TT		 511 es = EXT4_SB(inode->i_sb)->s_es;
512 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
efbed4dc 513 if (ext4_error_ratelimit(inode->i_sb)) {
9bf39ab2 514 path = file_path(file, pathname, sizeof(pathname));
efbed4dc
TT		 515 if (IS_ERR(path))
516 path = "(unknown)";
517 va_start(args, fmt);
518 vaf.fmt = fmt;
519 vaf.va = &args;
520 if (block)
521 printk(KERN_CRIT
522 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
523 "block %llu: comm %s: path %s: %pV\n",
524 inode->i_sb->s_id, function, line, inode->i_ino,
525 block, current->comm, path, &vaf);
526 else
527 printk(KERN_CRIT
528 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
529 "comm %s: path %s: %pV\n",
530 inode->i_sb->s_id, function, line, inode->i_ino,
531 current->comm, path, &vaf);
532 va_end(args);
533 }
1c13d5c0 534 save_error_info(inode->i_sb, function, line);
273df556
FM		 535 ext4_handle_error(inode->i_sb);
536}
537
722887dd
TT		 538const char *ext4_decode_error(struct super_block *sb, int errno,
539 char nbuf[16])
ac27a0ec
DK		 540{
541 char *errstr = NULL;
542
543 switch (errno) {
6a797d27
DW		 544 case -EFSCORRUPTED:
545 errstr = "Corrupt filesystem";
546 break;
547 case -EFSBADCRC:
548 errstr = "Filesystem failed CRC";
549 break;
ac27a0ec
DK		 550 case -EIO:
551 errstr = "IO failure";
552 break;
553 case -ENOMEM:
554 errstr = "Out of memory";
555 break;
556 case -EROFS:
78f1ddbb
TT		 557 if (!sb || (EXT4_SB(sb)->s_journal &&
558 EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT))
ac27a0ec
DK		 559 errstr = "Journal has aborted";
560 else
561 errstr = "Readonly filesystem";
562 break;
563 default:
564 /* If the caller passed in an extra buffer for unknown
565 * errors, textualise them now. Else we just return
566 * NULL. */
567 if (nbuf) {
568 /* Check for truncated error codes... */
569 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
570 errstr = nbuf;
571 }
572 break;
573 }
574
575 return errstr;
576}
577
617ba13b 578/* __ext4_std_error decodes expected errors from journaling functions
ac27a0ec
DK		 579 * automatically and invokes the appropriate error response. */
580
c398eda0
TT		 581void __ext4_std_error(struct super_block *sb, const char *function,
582 unsigned int line, int errno)
ac27a0ec
DK		 583{
584 char nbuf[16];
585 const char *errstr;
586
0db1ff22
TT		 587 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
588 return;
589
ac27a0ec
DK		 590 /* Special case: if the error is EROFS, and we're not already
591 * inside a transaction, then there's really no point in logging
592 * an error. */
bc98a42c 593 if (errno == -EROFS && journal_current_handle() == NULL && sb_rdonly(sb))
ac27a0ec
DK		 594 return;
595
efbed4dc
TT		 596 if (ext4_error_ratelimit(sb)) {
597 errstr = ext4_decode_error(sb, errno, nbuf);
598 printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n",
599 sb->s_id, function, line, errstr);
600 }
ac27a0ec 601
efbed4dc 602 save_error_info(sb, function, line);
617ba13b 603 ext4_handle_error(sb);
ac27a0ec
DK		 604}
605
606/*
617ba13b 607 * ext4_abort is a much stronger failure handler than ext4_error. The
ac27a0ec
DK		 608 * abort function may be used to deal with unrecoverable failures such
609 * as journal IO errors or ENOMEM at a critical moment in log management.
610 *
611 * We unconditionally force the filesystem into an ABORT|READONLY state,
612 * unless the error response on the fs has been set to panic in which
613 * case we take the easy way out and panic immediately.
614 */
615
c67d859e 616void __ext4_abort(struct super_block *sb, const char *function,
c398eda0 617 unsigned int line, const char *fmt, ...)
ac27a0ec 618{
651e1c3b 619 struct va_format vaf;
ac27a0ec
DK		 620 va_list args;
621
0db1ff22
TT		 622 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
623 return;
624
1c13d5c0 625 save_error_info(sb, function, line);
ac27a0ec 626 va_start(args, fmt);
651e1c3b
JP		 627 vaf.fmt = fmt;
628 vaf.va = &args;
629 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: %pV\n",
630 sb->s_id, function, line, &vaf);
ac27a0ec
DK		 631 va_end(args);
632
bc98a42c 633 if (sb_rdonly(sb) == 0) {
1c13d5c0 634 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
1c13d5c0 635 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
4418e141
DM		 636 /*
637 * Make sure updated value of ->s_mount_flags will be visible
638 * before ->s_flags update
639 */
640 smp_wmb();
1751e8a6 641 sb->s_flags |= SB_RDONLY;
1c13d5c0
TT		 642 if (EXT4_SB(sb)->s_journal)
643 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
644 save_error_info(sb, function, line);
645 }
4327ba52
DJ		 646 if (test_opt(sb, ERRORS_PANIC)) {
647 if (EXT4_SB(sb)->s_journal &&
648 !(EXT4_SB(sb)->s_journal->j_flags & JBD2_REC_ERR))
649 return;
617ba13b 650 panic("EXT4-fs panic from previous error\n");
4327ba52 651 }
ac27a0ec
DK		 652}
653
e7c96e8e
JP		 654void __ext4_msg(struct super_block *sb,
655 const char *prefix, const char *fmt, ...)
b31e1552 656{
0ff2ea7d 657 struct va_format vaf;
b31e1552
ES		 658 va_list args;
659
efbed4dc
TT		 660 if (!___ratelimit(&(EXT4_SB(sb)->s_msg_ratelimit_state), "EXT4-fs"))
661 return;
662
b31e1552 663 va_start(args, fmt);
0ff2ea7d
JP		 664 vaf.fmt = fmt;
665 vaf.va = &args;
666 printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
b31e1552
ES		 667 va_end(args);
668}
669
b03a2f7e
AD		 670#define ext4_warning_ratelimit(sb) \
671 ___ratelimit(&(EXT4_SB(sb)->s_warning_ratelimit_state), \
672 "EXT4-fs warning")
673
12062ddd 674void __ext4_warning(struct super_block *sb, const char *function,
c398eda0 675 unsigned int line, const char *fmt, ...)
ac27a0ec 676{
0ff2ea7d 677 struct va_format vaf;
ac27a0ec
DK		 678 va_list args;
679
b03a2f7e 680 if (!ext4_warning_ratelimit(sb))
efbed4dc
TT		 681 return;
682
ac27a0ec 683 va_start(args, fmt);
0ff2ea7d
JP		 684 vaf.fmt = fmt;
685 vaf.va = &args;
686 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: %pV\n",
687 sb->s_id, function, line, &vaf);
ac27a0ec
DK		 688 va_end(args);
689}
690
b03a2f7e
AD		 691void __ext4_warning_inode(const struct inode *inode, const char *function,
692 unsigned int line, const char *fmt, ...)
693{
694 struct va_format vaf;
695 va_list args;
696
697 if (!ext4_warning_ratelimit(inode->i_sb))
698 return;
699
700 va_start(args, fmt);
701 vaf.fmt = fmt;
702 vaf.va = &args;
703 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: "
704 "inode #%lu: comm %s: %pV\n", inode->i_sb->s_id,
705 function, line, inode->i_ino, current->comm, &vaf);
706 va_end(args);
707}
708
e29136f8
TT		 709void __ext4_grp_locked_error(const char *function, unsigned int line,
710 struct super_block *sb, ext4_group_t grp,
711 unsigned long ino, ext4_fsblk_t block,
712 const char *fmt, ...)
5d1b1b3f
AK		 713__releases(bitlock)
714__acquires(bitlock)
715{
0ff2ea7d 716 struct va_format vaf;
5d1b1b3f
AK		 717 va_list args;
718 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
719
0db1ff22
TT		 720 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
721 return;
722
ccf0f32a 723 trace_ext4_error(sb, function, line);
1c13d5c0
TT		 724 es->s_last_error_ino = cpu_to_le32(ino);
725 es->s_last_error_block = cpu_to_le64(block);
726 __save_error_info(sb, function, line);
0ff2ea7d 727
efbed4dc
TT		 728 if (ext4_error_ratelimit(sb)) {
729 va_start(args, fmt);
730 vaf.fmt = fmt;
731 vaf.va = &args;
732 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u, ",
733 sb->s_id, function, line, grp);
734 if (ino)
735 printk(KERN_CONT "inode %lu: ", ino);
736 if (block)
737 printk(KERN_CONT "block %llu:",
738 (unsigned long long) block);
739 printk(KERN_CONT "%pV\n", &vaf);
740 va_end(args);
741 }
5d1b1b3f
AK		 742
743 if (test_opt(sb, ERRORS_CONT)) {
e2d67052 744 ext4_commit_super(sb, 0);
5d1b1b3f
AK		 745 return;
746 }
1c13d5c0 747
5d1b1b3f 748 ext4_unlock_group(sb, grp);
06f29cc8 749 ext4_commit_super(sb, 1);
5d1b1b3f
AK		 750 ext4_handle_error(sb);
751 /*
752 * We only get here in the ERRORS_RO case; relocking the group
753 * may be dangerous, but nothing bad will happen since the
754 * filesystem will have already been marked read/only and the
755 * journal has been aborted. We return 1 as a hint to callers
756 * who might what to use the return value from
25985edc 757 * ext4_grp_locked_error() to distinguish between the
5d1b1b3f
AK		 758 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
759 * aggressively from the ext4 function in question, with a
760 * more appropriate error code.
761 */
762 ext4_lock_group(sb, grp);
763 return;
764}
765
db79e6d1
WS		 766void ext4_mark_group_bitmap_corrupted(struct super_block *sb,
767 ext4_group_t group,
768 unsigned int flags)
769{
770 struct ext4_sb_info *sbi = EXT4_SB(sb);
771 struct ext4_group_info *grp = ext4_get_group_info(sb, group);
772 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, group, NULL);
773
774 if ((flags & EXT4_GROUP_INFO_BBITMAP_CORRUPT) &&
775 !EXT4_MB_GRP_BBITMAP_CORRUPT(grp)) {
776 percpu_counter_sub(&sbi->s_freeclusters_counter,
777 grp->bb_free);
778 set_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT,
779 &grp->bb_state);
780 }
781
782 if ((flags & EXT4_GROUP_INFO_IBITMAP_CORRUPT) &&
783 !EXT4_MB_GRP_IBITMAP_CORRUPT(grp)) {
784 if (gdp) {
785 int count;
786
787 count = ext4_free_inodes_count(sb, gdp);
788 percpu_counter_sub(&sbi->s_freeinodes_counter,
789 count);
790 }
791 set_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT,
792 &grp->bb_state);
793 }
794}
795
617ba13b 796void ext4_update_dynamic_rev(struct super_block *sb)
ac27a0ec 797{
617ba13b 798 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
ac27a0ec 799
617ba13b 800 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
ac27a0ec
DK		 801 return;
802
12062ddd 803 ext4_warning(sb,
ac27a0ec
DK		 804 "updating to rev %d because of new feature flag, "
805 "running e2fsck is recommended",
617ba13b 806 EXT4_DYNAMIC_REV);
ac27a0ec 807
617ba13b
MC		 808 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
809 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
810 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
ac27a0ec
DK		 811 /* leave es->s_feature_*compat flags alone */
812 /* es->s_uuid will be set by e2fsck if empty */
813
814 /*
815 * The rest of the superblock fields should be zero, and if not it
816 * means they are likely already in use, so leave them alone. We
817 * can leave it up to e2fsck to clean up any inconsistencies there.
818 */
819}
820
821/*
822 * Open the external journal device
823 */
b31e1552 824static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb)
ac27a0ec
DK		 825{
826 struct block_device *bdev;
827 char b[BDEVNAME_SIZE];
828
d4d77629 829 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
ac27a0ec
DK		 830 if (IS_ERR(bdev))
831 goto fail;
832 return bdev;
833
834fail:
b31e1552 835 ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld",
ac27a0ec
DK		 836 __bdevname(dev, b), PTR_ERR(bdev));
837 return NULL;
838}
839
840/*
841 * Release the journal device
842 */
4385bab1 843static void ext4_blkdev_put(struct block_device *bdev)
ac27a0ec 844{
4385bab1 845 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
ac27a0ec
DK		 846}
847
4385bab1 848static void ext4_blkdev_remove(struct ext4_sb_info *sbi)
ac27a0ec
DK		 849{
850 struct block_device *bdev;
ac27a0ec
DK		 851 bdev = sbi->journal_bdev;
852 if (bdev) {
4385bab1 853 ext4_blkdev_put(bdev);
ac27a0ec
DK		 854 sbi->journal_bdev = NULL;
855 }
ac27a0ec
DK		 856}
857
858static inline struct inode *orphan_list_entry(struct list_head *l)
859{
617ba13b 860 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
ac27a0ec
DK		 861}
862
617ba13b 863static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
ac27a0ec
DK		 864{
865 struct list_head *l;
866
b31e1552
ES		 867 ext4_msg(sb, KERN_ERR, "sb orphan head is %d",
868 le32_to_cpu(sbi->s_es->s_last_orphan));
ac27a0ec
DK		 869
870 printk(KERN_ERR "sb_info orphan list:\n");
871 list_for_each(l, &sbi->s_orphan) {
872 struct inode *inode = orphan_list_entry(l);
873 printk(KERN_ERR " "
874 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
875 inode->i_sb->s_id, inode->i_ino, inode,
876 inode->i_mode, inode->i_nlink,
877 NEXT_ORPHAN(inode));
878 }
879}
880
957153fc
JK		 881#ifdef CONFIG_QUOTA
882static int ext4_quota_off(struct super_block *sb, int type);
883
884static inline void ext4_quota_off_umount(struct super_block *sb)
885{
886 int type;
887
964edf66
JK		 888 /* Use our quota_off function to clear inode flags etc. */
889 for (type = 0; type < EXT4_MAXQUOTAS; type++)
890 ext4_quota_off(sb, type);
957153fc
JK		 891}
892#else
893static inline void ext4_quota_off_umount(struct super_block *sb)
894{
895}
896#endif
897
2b2d6d01 898static void ext4_put_super(struct super_block *sb)
ac27a0ec 899{
617ba13b
MC		 900 struct ext4_sb_info *sbi = EXT4_SB(sb);
901 struct ext4_super_block *es = sbi->s_es;
97abd7d4 902 int aborted = 0;
ef2cabf7 903 int i, err;
ac27a0ec 904
857ac889 905 ext4_unregister_li_request(sb);
957153fc 906 ext4_quota_off_umount(sb);
e0ccfd95 907
2e8fa54e 908 destroy_workqueue(sbi->rsv_conversion_wq);
4c0425ff 909
0390131b 910 if (sbi->s_journal) {
97abd7d4 911 aborted = is_journal_aborted(sbi->s_journal);
0390131b
FM		 912 err = jbd2_journal_destroy(sbi->s_journal);
913 sbi->s_journal = NULL;
97abd7d4 914 if ((err < 0) && !aborted)
c67d859e 915 ext4_abort(sb, "Couldn't clean up the journal");
0390131b 916 }
d4edac31 917
ebd173be 918 ext4_unregister_sysfs(sb);
d3922a77 919 ext4_es_unregister_shrinker(sbi);
9105bb14 920 del_timer_sync(&sbi->s_err_report);
d4edac31
JB		 921 ext4_release_system_zone(sb);
922 ext4_mb_release(sb);
923 ext4_ext_release(sb);
d4edac31 924
bc98a42c 925 if (!sb_rdonly(sb) && !aborted) {
e2b911c5 926 ext4_clear_feature_journal_needs_recovery(sb);
ac27a0ec 927 es->s_state = cpu_to_le16(sbi->s_mount_state);
ac27a0ec 928 }
bc98a42c 929 if (!sb_rdonly(sb))
a8e25a83
AB		 930 ext4_commit_super(sb, 1);
931
ac27a0ec
DK		 932 for (i = 0; i < sbi->s_gdb_count; i++)
933 brelse(sbi->s_group_desc[i]);
b93b41d4
AV		 934 kvfree(sbi->s_group_desc);
935 kvfree(sbi->s_flex_groups);
57042651 936 percpu_counter_destroy(&sbi->s_freeclusters_counter);
ac27a0ec
DK		 937 percpu_counter_destroy(&sbi->s_freeinodes_counter);
938 percpu_counter_destroy(&sbi->s_dirs_counter);
57042651 939 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
c8585c6f 940 percpu_free_rwsem(&sbi->s_journal_flag_rwsem);
ac27a0ec 941#ifdef CONFIG_QUOTA
a2d4a646 942 for (i = 0; i < EXT4_MAXQUOTAS; i++)
ac27a0ec
DK		 943 kfree(sbi->s_qf_names[i]);
944#endif
945
946 /* Debugging code just in case the in-memory inode orphan list
947 * isn't empty. The on-disk one can be non-empty if we've
948 * detected an error and taken the fs readonly, but the
949 * in-memory list had better be clean by this point. */
950 if (!list_empty(&sbi->s_orphan))
951 dump_orphan_list(sb, sbi);
952 J_ASSERT(list_empty(&sbi->s_orphan));
953
89d96a6f 954 sync_blockdev(sb->s_bdev);
f98393a6 955 invalidate_bdev(sb->s_bdev);
ac27a0ec
DK		 956 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
957 /*
958 * Invalidate the journal device's buffers. We don't want them
959 * floating about in memory - the physical journal device may
960 * hotswapped, and it breaks the `ro-after' testing code.
961 */
962 sync_blockdev(sbi->journal_bdev);
f98393a6 963 invalidate_bdev(sbi->journal_bdev);
617ba13b 964 ext4_blkdev_remove(sbi);
ac27a0ec 965 }
dec214d0
TE		 966 if (sbi->s_ea_inode_cache) {
967 ext4_xattr_destroy_cache(sbi->s_ea_inode_cache);
968 sbi->s_ea_inode_cache = NULL;
969 }
47387409
TE		 970 if (sbi->s_ea_block_cache) {
971 ext4_xattr_destroy_cache(sbi->s_ea_block_cache);
972 sbi->s_ea_block_cache = NULL;
9c191f70 973 }
c5e06d10
JL		 974 if (sbi->s_mmp_tsk)
975 kthread_stop(sbi->s_mmp_tsk);
9060dd2c 976 brelse(sbi->s_sbh);
ac27a0ec 977 sb->s_fs_info = NULL;
3197ebdb
TT		 978 /*
979 * Now that we are completely done shutting down the
980 * superblock, we need to actually destroy the kobject.
981 */
3197ebdb
TT		 982 kobject_put(&sbi->s_kobj);
983 wait_for_completion(&sbi->s_kobj_unregister);
0441984a
DW		 984 if (sbi->s_chksum_driver)
985 crypto_free_shash(sbi->s_chksum_driver);
705895b6 986 kfree(sbi->s_blockgroup_lock);
5e405595 987 fs_put_dax(sbi->s_daxdev);
ac27a0ec 988 kfree(sbi);
ac27a0ec
DK		 989}
990
e18b890b 991static struct kmem_cache *ext4_inode_cachep;
ac27a0ec
DK		 992
993/*
994 * Called inside transaction, so use GFP_NOFS
995 */
617ba13b 996static struct inode *ext4_alloc_inode(struct super_block *sb)
ac27a0ec 997{
617ba13b 998 struct ext4_inode_info *ei;
ac27a0ec 999
e6b4f8da 1000 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
ac27a0ec
DK		 1001 if (!ei)
1002 return NULL;
0b8e58a1 1003
ee73f9a5 1004 inode_set_iversion(&ei->vfs_inode, 1);
202ee5df 1005 spin_lock_init(&ei->i_raw_lock);
c9de560d
AT		 1006 INIT_LIST_HEAD(&ei->i_prealloc_list);
1007 spin_lock_init(&ei->i_prealloc_lock);
9a26b661
ZL		 1008 ext4_es_init_tree(&ei->i_es_tree);
1009 rwlock_init(&ei->i_es_lock);
edaa53ca 1010 INIT_LIST_HEAD(&ei->i_es_list);
eb68d0e2 1011 ei->i_es_all_nr = 0;
edaa53ca 1012 ei->i_es_shk_nr = 0;
dd475925 1013 ei->i_es_shrink_lblk = 0;
d2a17637 1014 ei->i_reserved_data_blocks = 0;
9d0be502 1015 ei->i_da_metadata_calc_len = 0;
7e731bc9 1016 ei->i_da_metadata_calc_last_lblock = 0;
d2a17637 1017 spin_lock_init(&(ei->i_block_reservation_lock));
a9e7f447
DM		 1018#ifdef CONFIG_QUOTA
1019 ei->i_reserved_quota = 0;
96c7e0d9 1020 memset(&ei->i_dquot, 0, sizeof(ei->i_dquot));
a9e7f447 1021#endif
8aefcd55 1022 ei->jinode = NULL;
2e8fa54e 1023 INIT_LIST_HEAD(&ei->i_rsv_conversion_list);
744692dc 1024 spin_lock_init(&ei->i_completed_io_lock);
b436b9be
JK		 1025 ei->i_sync_tid = 0;
1026 ei->i_datasync_tid = 0;
e27f41e1 1027 atomic_set(&ei->i_unwritten, 0);
2e8fa54e 1028 INIT_WORK(&ei->i_rsv_conversion_work, ext4_end_io_rsv_work);
ac27a0ec
DK		 1029 return &ei->vfs_inode;
1030}
1031
7ff9c073
TT		 1032static int ext4_drop_inode(struct inode *inode)
1033{
1034 int drop = generic_drop_inode(inode);
1035
1036 trace_ext4_drop_inode(inode, drop);
1037 return drop;
1038}
1039
fa0d7e3d
NP		 1040static void ext4_i_callback(struct rcu_head *head)
1041{
1042 struct inode *inode = container_of(head, struct inode, i_rcu);
fa0d7e3d
NP		 1043 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
1044}
1045
617ba13b 1046static void ext4_destroy_inode(struct inode *inode)
ac27a0ec 1047{
9f7dd93d 1048 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
b31e1552
ES		 1049 ext4_msg(inode->i_sb, KERN_ERR,
1050 "Inode %lu (%p): orphan list check failed!",
1051 inode->i_ino, EXT4_I(inode));
9f7dd93d
VA		 1052 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
1053 EXT4_I(inode), sizeof(struct ext4_inode_info),
1054 true);
1055 dump_stack();
1056 }
fa0d7e3d 1057 call_rcu(&inode->i_rcu, ext4_i_callback);
ac27a0ec
DK		 1058}
1059
51cc5068 1060static void init_once(void *foo)
ac27a0ec 1061{
617ba13b 1062 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
ac27a0ec 1063
a35afb83 1064 INIT_LIST_HEAD(&ei->i_orphan);
a35afb83 1065 init_rwsem(&ei->xattr_sem);
0e855ac8 1066 init_rwsem(&ei->i_data_sem);
ea3d7209 1067 init_rwsem(&ei->i_mmap_sem);
a35afb83 1068 inode_init_once(&ei->vfs_inode);
ac27a0ec
DK		 1069}
1070
e67bc2b3 1071static int __init init_inodecache(void)
ac27a0ec 1072{
f8dd7c70
DW		 1073 ext4_inode_cachep = kmem_cache_create_usercopy("ext4_inode_cache",
1074 sizeof(struct ext4_inode_info), 0,
1075 (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|
1076 SLAB_ACCOUNT),
1077 offsetof(struct ext4_inode_info, i_data),
1078 sizeof_field(struct ext4_inode_info, i_data),
1079 init_once);
617ba13b 1080 if (ext4_inode_cachep == NULL)
ac27a0ec
DK		 1081 return -ENOMEM;
1082 return 0;
1083}
1084
1085static void destroy_inodecache(void)
1086{
8c0a8537
KS		 1087 /*
1088 * Make sure all delayed rcu free inodes are flushed before we
1089 * destroy cache.
1090 */
1091 rcu_barrier();
617ba13b 1092 kmem_cache_destroy(ext4_inode_cachep);
ac27a0ec
DK		 1093}
1094
0930fcc1 1095void ext4_clear_inode(struct inode *inode)
ac27a0ec 1096{
0930fcc1 1097 invalidate_inode_buffers(inode);
dbd5768f 1098 clear_inode(inode);
9f754758 1099 dquot_drop(inode);
c2ea3fde 1100 ext4_discard_preallocations(inode);
51865fda 1101 ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS);
8aefcd55
TT		 1102 if (EXT4_I(inode)->jinode) {
1103 jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode),
1104 EXT4_I(inode)->jinode);
1105 jbd2_free_inode(EXT4_I(inode)->jinode);
1106 EXT4_I(inode)->jinode = NULL;
1107 }
3d204e24 1108 fscrypt_put_encryption_info(inode);
ac27a0ec
DK		 1109}
1110
1b961ac0 1111static struct inode *ext4_nfs_get_inode(struct super_block *sb,
0b8e58a1 1112 u64 ino, u32 generation)
ac27a0ec 1113{
ac27a0ec 1114 struct inode *inode;
ac27a0ec 1115
617ba13b 1116 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
ac27a0ec 1117 return ERR_PTR(-ESTALE);
617ba13b 1118 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
ac27a0ec
DK		 1119 return ERR_PTR(-ESTALE);
1120
1121 /* iget isn't really right if the inode is currently unallocated!!
1122 *
617ba13b 1123 * ext4_read_inode will return a bad_inode if the inode had been
ac27a0ec
DK		 1124 * deleted, so we should be safe.
1125 *
1126 * Currently we don't know the generation for parent directory, so
1127 * a generation of 0 means "accept any"
1128 */
f4bb2981 1129 inode = ext4_iget_normal(sb, ino);
1d1fe1ee
DH		 1130 if (IS_ERR(inode))
1131 return ERR_CAST(inode);
1132 if (generation && inode->i_generation != generation) {
ac27a0ec
DK		 1133 iput(inode);
1134 return ERR_PTR(-ESTALE);
1135 }
1b961ac0
CH		 1136
1137 return inode;
1138}
1139
1140static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
0b8e58a1 1141 int fh_len, int fh_type)
1b961ac0
CH		 1142{
1143 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
1144 ext4_nfs_get_inode);
1145}
1146
1147static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
0b8e58a1 1148 int fh_len, int fh_type)
1b961ac0
CH		 1149{
1150 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
1151 ext4_nfs_get_inode);
ac27a0ec
DK		 1152}
1153
c39a7f84
TO		 1154/*
1155 * Try to release metadata pages (indirect blocks, directories) which are
1156 * mapped via the block device. Since these pages could have journal heads
1157 * which would prevent try_to_free_buffers() from freeing them, we must use
1158 * jbd2 layer's try_to_free_buffers() function to release them.
1159 */
0b8e58a1
AD		 1160static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
1161 gfp_t wait)
c39a7f84
TO		 1162{
1163 journal_t *journal = EXT4_SB(sb)->s_journal;
1164
1165 WARN_ON(PageChecked(page));
1166 if (!page_has_buffers(page))
1167 return 0;
1168 if (journal)
1169 return jbd2_journal_try_to_free_buffers(journal, page,
d0164adc 1170 wait & ~__GFP_DIRECT_RECLAIM);
c39a7f84
TO		 1171 return try_to_free_buffers(page);
1172}
1173
a7550b30
JK		 1174#ifdef CONFIG_EXT4_FS_ENCRYPTION
1175static int ext4_get_context(struct inode *inode, void *ctx, size_t len)
1176{
1177 return ext4_xattr_get(inode, EXT4_XATTR_INDEX_ENCRYPTION,
1178 EXT4_XATTR_NAME_ENCRYPTION_CONTEXT, ctx, len);
1179}
1180
a7550b30
JK		 1181static int ext4_set_context(struct inode *inode, const void *ctx, size_t len,
1182 void *fs_data)
1183{
2f8f5e76 1184 handle_t *handle = fs_data;
c1a5d5f6 1185 int res, res2, credits, retries = 0;
2f8f5e76 1186
9ce0151a
EB		 1187 /*
1188 * Encrypting the root directory is not allowed because e2fsck expects
1189 * lost+found to exist and be unencrypted, and encrypting the root
1190 * directory would imply encrypting the lost+found directory as well as
1191 * the filename "lost+found" itself.
1192 */
1193 if (inode->i_ino == EXT4_ROOT_INO)
1194 return -EPERM;
2f8f5e76 1195
7d3e06a8
RZ		 1196 if (WARN_ON_ONCE(IS_DAX(inode) && i_size_read(inode)))
1197 return -EINVAL;
1198
94840e3c
EB		 1199 res = ext4_convert_inline_data(inode);
1200 if (res)
1201 return res;
1202
2f8f5e76
EB		 1203 /*
1204 * If a journal handle was specified, then the encryption context is
1205 * being set on a new inode via inheritance and is part of a larger
1206 * transaction to create the inode. Otherwise the encryption context is
1207 * being set on an existing inode in its own transaction. Only in the
1208 * latter case should the "retry on ENOSPC" logic be used.
1209 */
a7550b30 1210
2f8f5e76
EB		 1211 if (handle) {
1212 res = ext4_xattr_set_handle(handle, inode,
1213 EXT4_XATTR_INDEX_ENCRYPTION,
1214 EXT4_XATTR_NAME_ENCRYPTION_CONTEXT,
1215 ctx, len, 0);
a7550b30
JK		 1216 if (!res) {
1217 ext4_set_inode_flag(inode, EXT4_INODE_ENCRYPT);
1218 ext4_clear_inode_state(inode,
1219 EXT4_STATE_MAY_INLINE_DATA);
a3caa24b 1220 /*
2ee6a576
EB		 1221 * Update inode->i_flags - S_ENCRYPTED will be enabled,
1222 * S_DAX may be disabled
a3caa24b
JK		 1223 */
1224 ext4_set_inode_flags(inode);
a7550b30
JK		 1225 }
1226 return res;
1227 }
1228
b8cb5a54
TE		 1229 res = dquot_initialize(inode);
1230 if (res)
1231 return res;
2f8f5e76 1232retry:
af65207c
TE		 1233 res = ext4_xattr_set_credits(inode, len, false /* is_create */,
1234 &credits);
dec214d0
TE		 1235 if (res)
1236 return res;
1237
c1a5d5f6 1238 handle = ext4_journal_start(inode, EXT4_HT_MISC, credits);
a7550b30
JK		 1239 if (IS_ERR(handle))
1240 return PTR_ERR(handle);
1241
2f8f5e76
EB		 1242 res = ext4_xattr_set_handle(handle, inode, EXT4_XATTR_INDEX_ENCRYPTION,
1243 EXT4_XATTR_NAME_ENCRYPTION_CONTEXT,
1244 ctx, len, 0);
a7550b30
JK		 1245 if (!res) {
1246 ext4_set_inode_flag(inode, EXT4_INODE_ENCRYPT);
2ee6a576
EB		 1247 /*
1248 * Update inode->i_flags - S_ENCRYPTED will be enabled,
1249 * S_DAX may be disabled
1250 */
a3caa24b 1251 ext4_set_inode_flags(inode);
a7550b30
JK		 1252 res = ext4_mark_inode_dirty(handle, inode);
1253 if (res)
1254 EXT4_ERROR_INODE(inode, "Failed to mark inode dirty");
1255 }
1256 res2 = ext4_journal_stop(handle);
2f8f5e76
EB		 1257
1258 if (res == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
1259 goto retry;
a7550b30
JK		 1260 if (!res)
1261 res = res2;
1262 return res;
1263}
1264
c250b7dd 1265static bool ext4_dummy_context(struct inode *inode)
a7550b30
JK		 1266{
1267 return DUMMY_ENCRYPTION_ENABLED(EXT4_SB(inode->i_sb));
1268}
1269
6f69f0ed 1270static const struct fscrypt_operations ext4_cryptops = {
a5d431ef 1271 .key_prefix = "ext4:",
a7550b30 1272 .get_context = ext4_get_context,
a7550b30
JK		 1273 .set_context = ext4_set_context,
1274 .dummy_context = ext4_dummy_context,
a7550b30 1275 .empty_dir = ext4_empty_dir,
e12ee683 1276 .max_namelen = EXT4_NAME_LEN,
a7550b30 1277};
a7550b30
JK		 1278#endif
1279
ac27a0ec 1280#ifdef CONFIG_QUOTA
d6006186 1281static const char * const quotatypes[] = INITQFNAMES;
689c958c 1282#define QTYPE2NAME(t) (quotatypes[t])
ac27a0ec 1283
617ba13b
MC		 1284static int ext4_write_dquot(struct dquot *dquot);
1285static int ext4_acquire_dquot(struct dquot *dquot);
1286static int ext4_release_dquot(struct dquot *dquot);
1287static int ext4_mark_dquot_dirty(struct dquot *dquot);
1288static int ext4_write_info(struct super_block *sb, int type);
6f28e087 1289static int ext4_quota_on(struct super_block *sb, int type, int format_id,
8c54ca9c 1290 const struct path *path);
617ba13b
MC		 1291static int ext4_quota_on_mount(struct super_block *sb, int type);
1292static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec 1293 size_t len, loff_t off);
617ba13b 1294static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec 1295 const char *data, size_t len, loff_t off);
7c319d32
AK		 1296static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
1297 unsigned int flags);
1298static int ext4_enable_quotas(struct super_block *sb);
8f0e8746 1299static int ext4_get_next_id(struct super_block *sb, struct kqid *qid);
ac27a0ec 1300
96c7e0d9
JK		 1301static struct dquot **ext4_get_dquots(struct inode *inode)
1302{
1303 return EXT4_I(inode)->i_dquot;
1304}
1305
61e225dc 1306static const struct dquot_operations ext4_quota_operations = {
7a9ca53a
TE		 1307 .get_reserved_space = ext4_get_reserved_space,
1308 .write_dquot = ext4_write_dquot,
1309 .acquire_dquot = ext4_acquire_dquot,
1310 .release_dquot = ext4_release_dquot,
1311 .mark_dirty = ext4_mark_dquot_dirty,
1312 .write_info = ext4_write_info,
1313 .alloc_dquot = dquot_alloc,
1314 .destroy_dquot = dquot_destroy,
1315 .get_projid = ext4_get_projid,
1316 .get_inode_usage = ext4_get_inode_usage,
1317 .get_next_id = ext4_get_next_id,
ac27a0ec
DK		 1318};
1319
0d54b217 1320static const struct quotactl_ops ext4_qctl_operations = {
617ba13b 1321 .quota_on = ext4_quota_on,
ca0e05e4 1322 .quota_off = ext4_quota_off,
287a8095 1323 .quota_sync = dquot_quota_sync,
0a240339 1324 .get_state = dquot_get_state,
287a8095
CH		 1325 .set_info = dquot_set_dqinfo,
1326 .get_dqblk = dquot_get_dqblk,
6332b9b5
ES		 1327 .set_dqblk = dquot_set_dqblk,
1328 .get_nextdqblk = dquot_get_next_dqblk,
ac27a0ec
DK		 1329};
1330#endif
1331
ee9b6d61 1332static const struct super_operations ext4_sops = {
617ba13b
MC		 1333 .alloc_inode = ext4_alloc_inode,
1334 .destroy_inode = ext4_destroy_inode,
617ba13b
MC		 1335 .write_inode = ext4_write_inode,
1336 .dirty_inode = ext4_dirty_inode,
7ff9c073 1337 .drop_inode = ext4_drop_inode,
0930fcc1 1338 .evict_inode = ext4_evict_inode,
617ba13b 1339 .put_super = ext4_put_super,
617ba13b 1340 .sync_fs = ext4_sync_fs,
c4be0c1d
TS		 1341 .freeze_fs = ext4_freeze,
1342 .unfreeze_fs = ext4_unfreeze,
617ba13b
MC		 1343 .statfs = ext4_statfs,
1344 .remount_fs = ext4_remount,
617ba13b 1345 .show_options = ext4_show_options,
ac27a0ec 1346#ifdef CONFIG_QUOTA
617ba13b
MC		 1347 .quota_read = ext4_quota_read,
1348 .quota_write = ext4_quota_write,
96c7e0d9 1349 .get_dquots = ext4_get_dquots,
ac27a0ec 1350#endif
c39a7f84 1351 .bdev_try_to_free_page = bdev_try_to_free_page,
ac27a0ec
DK		 1352};
1353
39655164 1354static const struct export_operations ext4_export_ops = {
1b961ac0
CH		 1355 .fh_to_dentry = ext4_fh_to_dentry,
1356 .fh_to_parent = ext4_fh_to_parent,
617ba13b 1357 .get_parent = ext4_get_parent,
ac27a0ec
DK		 1358};
1359
1360enum {
1361 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
1362 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
72578c33 1363 Opt_nouid32, Opt_debug, Opt_removed,
ac27a0ec 1364 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
72578c33 1365 Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload,
ad4eec61
ES		 1366 Opt_commit, Opt_min_batch_time, Opt_max_batch_time, Opt_journal_dev,
1367 Opt_journal_path, Opt_journal_checksum, Opt_journal_async_commit,
ac27a0ec 1368 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
6ddb2447 1369 Opt_data_err_abort, Opt_data_err_ignore, Opt_test_dummy_encryption,
ac27a0ec 1370 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
5a20bdfc 1371 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
ee4a3fcd 1372 Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err,
49da9392 1373 Opt_usrquota, Opt_grpquota, Opt_prjquota, Opt_i_version, Opt_dax,
1449032b 1374 Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_mblk_io_submit,
670e9875 1375 Opt_lazytime, Opt_nolazytime, Opt_debug_want_extra_isize,
1449032b 1376 Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity,
5328e635 1377 Opt_inode_readahead_blks, Opt_journal_ioprio,
744692dc 1378 Opt_dioread_nolock, Opt_dioread_lock,
fc6cb1cd 1379 Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable,
cdb7ee4c 1380 Opt_max_dir_size_kb, Opt_nojournal_checksum, Opt_nombcache,
ac27a0ec
DK		 1381};
1382
a447c093 1383static const match_table_t tokens = {
ac27a0ec
DK		 1384 {Opt_bsd_df, "bsddf"},
1385 {Opt_minix_df, "minixdf"},
1386 {Opt_grpid, "grpid"},
1387 {Opt_grpid, "bsdgroups"},
1388 {Opt_nogrpid, "nogrpid"},
1389 {Opt_nogrpid, "sysvgroups"},
1390 {Opt_resgid, "resgid=%u"},
1391 {Opt_resuid, "resuid=%u"},
1392 {Opt_sb, "sb=%u"},
1393 {Opt_err_cont, "errors=continue"},
1394 {Opt_err_panic, "errors=panic"},
1395 {Opt_err_ro, "errors=remount-ro"},
1396 {Opt_nouid32, "nouid32"},
ac27a0ec 1397 {Opt_debug, "debug"},
72578c33
TT		 1398 {Opt_removed, "oldalloc"},
1399 {Opt_removed, "orlov"},
ac27a0ec
DK		 1400 {Opt_user_xattr, "user_xattr"},
1401 {Opt_nouser_xattr, "nouser_xattr"},
1402 {Opt_acl, "acl"},
1403 {Opt_noacl, "noacl"},
e3bb52ae 1404 {Opt_noload, "norecovery"},
5a916be1 1405 {Opt_noload, "noload"},
72578c33
TT		 1406 {Opt_removed, "nobh"},
1407 {Opt_removed, "bh"},
ac27a0ec 1408 {Opt_commit, "commit=%u"},
30773840
TT		 1409 {Opt_min_batch_time, "min_batch_time=%u"},
1410 {Opt_max_batch_time, "max_batch_time=%u"},
ac27a0ec 1411 {Opt_journal_dev, "journal_dev=%u"},
ad4eec61 1412 {Opt_journal_path, "journal_path=%s"},
818d276c 1413 {Opt_journal_checksum, "journal_checksum"},
c6d3d56d 1414 {Opt_nojournal_checksum, "nojournal_checksum"},
818d276c 1415 {Opt_journal_async_commit, "journal_async_commit"},
ac27a0ec
DK		 1416 {Opt_abort, "abort"},
1417 {Opt_data_journal, "data=journal"},
1418 {Opt_data_ordered, "data=ordered"},
1419 {Opt_data_writeback, "data=writeback"},
5bf5683a
HK		 1420 {Opt_data_err_abort, "data_err=abort"},
1421 {Opt_data_err_ignore, "data_err=ignore"},
ac27a0ec
DK		 1422 {Opt_offusrjquota, "usrjquota="},
1423 {Opt_usrjquota, "usrjquota=%s"},
1424 {Opt_offgrpjquota, "grpjquota="},
1425 {Opt_grpjquota, "grpjquota=%s"},
1426 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
1427 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
5a20bdfc 1428 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
ac27a0ec
DK		 1429 {Opt_grpquota, "grpquota"},
1430 {Opt_noquota, "noquota"},
1431 {Opt_quota, "quota"},
1432 {Opt_usrquota, "usrquota"},
49da9392 1433 {Opt_prjquota, "prjquota"},
ac27a0ec 1434 {Opt_barrier, "barrier=%u"},
06705bff
TT		 1435 {Opt_barrier, "barrier"},
1436 {Opt_nobarrier, "nobarrier"},
25ec56b5 1437 {Opt_i_version, "i_version"},
923ae0ff 1438 {Opt_dax, "dax"},
c9de560d 1439 {Opt_stripe, "stripe=%u"},
64769240 1440 {Opt_delalloc, "delalloc"},
a26f4992
TT		 1441 {Opt_lazytime, "lazytime"},
1442 {Opt_nolazytime, "nolazytime"},
670e9875 1443 {Opt_debug_want_extra_isize, "debug_want_extra_isize=%u"},
dd919b98 1444 {Opt_nodelalloc, "nodelalloc"},
36ade451
JK		 1445 {Opt_removed, "mblk_io_submit"},
1446 {Opt_removed, "nomblk_io_submit"},
6fd058f7
TT		 1447 {Opt_block_validity, "block_validity"},
1448 {Opt_noblock_validity, "noblock_validity"},
240799cd 1449 {Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
b3881f74 1450 {Opt_journal_ioprio, "journal_ioprio=%u"},
afd4672d 1451 {Opt_auto_da_alloc, "auto_da_alloc=%u"},
06705bff
TT		 1452 {Opt_auto_da_alloc, "auto_da_alloc"},
1453 {Opt_noauto_da_alloc, "noauto_da_alloc"},
744692dc
JZ		 1454 {Opt_dioread_nolock, "dioread_nolock"},
1455 {Opt_dioread_lock, "dioread_lock"},
5328e635
ES		 1456 {Opt_discard, "discard"},
1457 {Opt_nodiscard, "nodiscard"},
fc6cb1cd
TT		 1458 {Opt_init_itable, "init_itable=%u"},
1459 {Opt_init_itable, "init_itable"},
1460 {Opt_noinit_itable, "noinit_itable"},
df981d03 1461 {Opt_max_dir_size_kb, "max_dir_size_kb=%u"},
6ddb2447 1462 {Opt_test_dummy_encryption, "test_dummy_encryption"},
cdb7ee4c
TE		 1463 {Opt_nombcache, "nombcache"},
1464 {Opt_nombcache, "no_mbcache"}, /* for backward compatibility */
c7198b9c
TT		 1465 {Opt_removed, "check=none"}, /* mount option from ext2/3 */
1466 {Opt_removed, "nocheck"}, /* mount option from ext2/3 */
1467 {Opt_removed, "reservation"}, /* mount option from ext2/3 */
1468 {Opt_removed, "noreservation"}, /* mount option from ext2/3 */
1469 {Opt_removed, "journal=%u"}, /* mount option from ext2/3 */
f3f12faa 1470 {Opt_err, NULL},
ac27a0ec
DK		 1471};
1472
617ba13b 1473static ext4_fsblk_t get_sb_block(void **data)
ac27a0ec 1474{
617ba13b 1475 ext4_fsblk_t sb_block;
ac27a0ec
DK		 1476 char *options = (char *) *data;
1477
1478 if (!options || strncmp(options, "sb=", 3) != 0)
1479 return 1; /* Default location */
0b8e58a1 1480
ac27a0ec 1481 options += 3;
0b8e58a1 1482 /* TODO: use simple_strtoll with >32bit ext4 */
ac27a0ec
DK		 1483 sb_block = simple_strtoul(options, &options, 0);
1484 if (*options && *options != ',') {
4776004f 1485 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
ac27a0ec
DK		 1486 (char *) *data);
1487 return 1;
1488 }
1489 if (*options == ',')
1490 options++;
1491 *data = (void *) options;
0b8e58a1 1492
ac27a0ec
DK		 1493 return sb_block;
1494}
1495
b3881f74 1496#define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
d6006186
EB		 1497static const char deprecated_msg[] =
1498 "Mount option \"%s\" will be removed by %s\n"
437ca0fd 1499 "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
b3881f74 1500
56c50f11
DM		 1501#ifdef CONFIG_QUOTA
1502static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
1503{
1504 struct ext4_sb_info *sbi = EXT4_SB(sb);
1505 char *qname;
03dafb5f 1506 int ret = -1;
56c50f11
DM		 1507
1508 if (sb_any_quota_loaded(sb) &&
1509 !sbi->s_qf_names[qtype]) {
1510 ext4_msg(sb, KERN_ERR,
1511 "Cannot change journaled "
1512 "quota options when quota turned on");
57f73c2c 1513 return -1;
56c50f11 1514 }
e2b911c5 1515 if (ext4_has_feature_quota(sb)) {
c325a67c
TT		 1516 ext4_msg(sb, KERN_INFO, "Journaled quota options "
1517 "ignored when QUOTA feature is enabled");
1518 return 1;
262b4662 1519 }
56c50f11
DM		 1520 qname = match_strdup(args);
1521 if (!qname) {
1522 ext4_msg(sb, KERN_ERR,
1523 "Not enough memory for storing quotafile name");
57f73c2c 1524 return -1;
56c50f11 1525 }
03dafb5f
CG		 1526 if (sbi->s_qf_names[qtype]) {
1527 if (strcmp(sbi->s_qf_names[qtype], qname) == 0)
1528 ret = 1;
1529 else
1530 ext4_msg(sb, KERN_ERR,
1531 "%s quota file already specified",
1532 QTYPE2NAME(qtype));
1533 goto errout;
56c50f11 1534 }
03dafb5f 1535 if (strchr(qname, '/')) {
56c50f11
DM		 1536 ext4_msg(sb, KERN_ERR,
1537 "quotafile must be on filesystem root");
03dafb5f 1538 goto errout;
56c50f11 1539 }
03dafb5f 1540 sbi->s_qf_names[qtype] = qname;
fd8c37ec 1541 set_opt(sb, QUOTA);
56c50f11 1542 return 1;
03dafb5f
CG		 1543errout:
1544 kfree(qname);
1545 return ret;
56c50f11
DM		 1546}
1547
1548static int clear_qf_name(struct super_block *sb, int qtype)
1549{
1550
1551 struct ext4_sb_info *sbi = EXT4_SB(sb);
1552
1553 if (sb_any_quota_loaded(sb) &&
1554 sbi->s_qf_names[qtype]) {
1555 ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options"
1556 " when quota turned on");
57f73c2c 1557 return -1;
56c50f11 1558 }
03dafb5f 1559 kfree(sbi->s_qf_names[qtype]);
56c50f11
DM		 1560 sbi->s_qf_names[qtype] = NULL;
1561 return 1;
1562}
1563#endif
1564
26092bf5
TT		 1565#define MOPT_SET 0x0001
1566#define MOPT_CLEAR 0x0002
1567#define MOPT_NOSUPPORT 0x0004
1568#define MOPT_EXPLICIT 0x0008
1569#define MOPT_CLEAR_ERR 0x0010
1570#define MOPT_GTE0 0x0020
ac27a0ec 1571#ifdef CONFIG_QUOTA
26092bf5
TT		 1572#define MOPT_Q 0
1573#define MOPT_QFMT 0x0040
1574#else
1575#define MOPT_Q MOPT_NOSUPPORT
1576#define MOPT_QFMT MOPT_NOSUPPORT
ac27a0ec 1577#endif
26092bf5 1578#define MOPT_DATAJ 0x0080
8dc0aa8c
TT		 1579#define MOPT_NO_EXT2 0x0100
1580#define MOPT_NO_EXT3 0x0200
1581#define MOPT_EXT4_ONLY (MOPT_NO_EXT2 | MOPT_NO_EXT3)
ad4eec61 1582#define MOPT_STRING 0x0400
26092bf5
TT		 1583
1584static const struct mount_opts {
1585 int token;
1586 int mount_opt;
1587 int flags;
1588} ext4_mount_opts[] = {
1589 {Opt_minix_df, EXT4_MOUNT_MINIX_DF, MOPT_SET},
1590 {Opt_bsd_df, EXT4_MOUNT_MINIX_DF, MOPT_CLEAR},
1591 {Opt_grpid, EXT4_MOUNT_GRPID, MOPT_SET},
1592 {Opt_nogrpid, EXT4_MOUNT_GRPID, MOPT_CLEAR},
26092bf5
TT		 1593 {Opt_block_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_SET},
1594 {Opt_noblock_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_CLEAR},
8dc0aa8c
TT		 1595 {Opt_dioread_nolock, EXT4_MOUNT_DIOREAD_NOLOCK,
1596 MOPT_EXT4_ONLY | MOPT_SET},
1597 {Opt_dioread_lock, EXT4_MOUNT_DIOREAD_NOLOCK,
1598 MOPT_EXT4_ONLY | MOPT_CLEAR},
26092bf5
TT		 1599 {Opt_discard, EXT4_MOUNT_DISCARD, MOPT_SET},
1600 {Opt_nodiscard, EXT4_MOUNT_DISCARD, MOPT_CLEAR},
8dc0aa8c
TT		 1601 {Opt_delalloc, EXT4_MOUNT_DELALLOC,
1602 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
1603 {Opt_nodelalloc, EXT4_MOUNT_DELALLOC,
59d9fa5c 1604 MOPT_EXT4_ONLY | MOPT_CLEAR},
c6d3d56d
DW		 1605 {Opt_nojournal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
1606 MOPT_EXT4_ONLY | MOPT_CLEAR},
8dc0aa8c 1607 {Opt_journal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
1e381f60 1608 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
26092bf5 1609 {Opt_journal_async_commit, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT |
8dc0aa8c 1610 EXT4_MOUNT_JOURNAL_CHECKSUM),
1e381f60 1611 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
8dc0aa8c 1612 {Opt_noload, EXT4_MOUNT_NOLOAD, MOPT_NO_EXT2 | MOPT_SET},
26092bf5
TT		 1613 {Opt_err_panic, EXT4_MOUNT_ERRORS_PANIC, MOPT_SET | MOPT_CLEAR_ERR},
1614 {Opt_err_ro, EXT4_MOUNT_ERRORS_RO, MOPT_SET | MOPT_CLEAR_ERR},
1615 {Opt_err_cont, EXT4_MOUNT_ERRORS_CONT, MOPT_SET | MOPT_CLEAR_ERR},
8dc0aa8c 1616 {Opt_data_err_abort, EXT4_MOUNT_DATA_ERR_ABORT,
7915a861 1617 MOPT_NO_EXT2},
8dc0aa8c 1618 {Opt_data_err_ignore, EXT4_MOUNT_DATA_ERR_ABORT,
7915a861 1619 MOPT_NO_EXT2},
26092bf5
TT		 1620 {Opt_barrier, EXT4_MOUNT_BARRIER, MOPT_SET},
1621 {Opt_nobarrier, EXT4_MOUNT_BARRIER, MOPT_CLEAR},
1622 {Opt_noauto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_SET},
1623 {Opt_auto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_CLEAR},
1624 {Opt_noinit_itable, EXT4_MOUNT_INIT_INODE_TABLE, MOPT_CLEAR},
1625 {Opt_commit, 0, MOPT_GTE0},
1626 {Opt_max_batch_time, 0, MOPT_GTE0},
1627 {Opt_min_batch_time, 0, MOPT_GTE0},
1628 {Opt_inode_readahead_blks, 0, MOPT_GTE0},
1629 {Opt_init_itable, 0, MOPT_GTE0},
923ae0ff 1630 {Opt_dax, EXT4_MOUNT_DAX, MOPT_SET},
26092bf5 1631 {Opt_stripe, 0, MOPT_GTE0},
0efb3b23
JK		 1632 {Opt_resuid, 0, MOPT_GTE0},
1633 {Opt_resgid, 0, MOPT_GTE0},
5ba92bcf
CM		 1634 {Opt_journal_dev, 0, MOPT_NO_EXT2 | MOPT_GTE0},
1635 {Opt_journal_path, 0, MOPT_NO_EXT2 | MOPT_STRING},
1636 {Opt_journal_ioprio, 0, MOPT_NO_EXT2 | MOPT_GTE0},
8dc0aa8c
TT		 1637 {Opt_data_journal, EXT4_MOUNT_JOURNAL_DATA, MOPT_NO_EXT2 | MOPT_DATAJ},
1638 {Opt_data_ordered, EXT4_MOUNT_ORDERED_DATA, MOPT_NO_EXT2 | MOPT_DATAJ},
1639 {Opt_data_writeback, EXT4_MOUNT_WRITEBACK_DATA,
1640 MOPT_NO_EXT2 | MOPT_DATAJ},
26092bf5
TT		 1641 {Opt_user_xattr, EXT4_MOUNT_XATTR_USER, MOPT_SET},
1642 {Opt_nouser_xattr, EXT4_MOUNT_XATTR_USER, MOPT_CLEAR},
03010a33 1643#ifdef CONFIG_EXT4_FS_POSIX_ACL
26092bf5
TT		 1644 {Opt_acl, EXT4_MOUNT_POSIX_ACL, MOPT_SET},
1645 {Opt_noacl, EXT4_MOUNT_POSIX_ACL, MOPT_CLEAR},
ac27a0ec 1646#else
26092bf5
TT		 1647 {Opt_acl, 0, MOPT_NOSUPPORT},
1648 {Opt_noacl, 0, MOPT_NOSUPPORT},
ac27a0ec 1649#endif
26092bf5
TT		 1650 {Opt_nouid32, EXT4_MOUNT_NO_UID32, MOPT_SET},
1651 {Opt_debug, EXT4_MOUNT_DEBUG, MOPT_SET},
670e9875 1652 {Opt_debug_want_extra_isize, 0, MOPT_GTE0},
26092bf5
TT		 1653 {Opt_quota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA, MOPT_SET | MOPT_Q},
1654 {Opt_usrquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA,
1655 MOPT_SET | MOPT_Q},
1656 {Opt_grpquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_GRPQUOTA,
1657 MOPT_SET | MOPT_Q},
49da9392
JK		 1658 {Opt_prjquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_PRJQUOTA,
1659 MOPT_SET | MOPT_Q},
26092bf5 1660 {Opt_noquota, (EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA |
49da9392
JK		 1661 EXT4_MOUNT_GRPQUOTA | EXT4_MOUNT_PRJQUOTA),
1662 MOPT_CLEAR | MOPT_Q},
26092bf5
TT		 1663 {Opt_usrjquota, 0, MOPT_Q},
1664 {Opt_grpjquota, 0, MOPT_Q},
1665 {Opt_offusrjquota, 0, MOPT_Q},
1666 {Opt_offgrpjquota, 0, MOPT_Q},
1667 {Opt_jqfmt_vfsold, QFMT_VFS_OLD, MOPT_QFMT},
1668 {Opt_jqfmt_vfsv0, QFMT_VFS_V0, MOPT_QFMT},
1669 {Opt_jqfmt_vfsv1, QFMT_VFS_V1, MOPT_QFMT},
df981d03 1670 {Opt_max_dir_size_kb, 0, MOPT_GTE0},
6ddb2447 1671 {Opt_test_dummy_encryption, 0, MOPT_GTE0},
cdb7ee4c 1672 {Opt_nombcache, EXT4_MOUNT_NO_MBCACHE, MOPT_SET},
26092bf5
TT		 1673 {Opt_err, 0, 0}
1674};
1675
1676static int handle_mount_opt(struct super_block *sb, char *opt, int token,
1677 substring_t *args, unsigned long *journal_devnum,
1678 unsigned int *journal_ioprio, int is_remount)
1679{
1680 struct ext4_sb_info *sbi = EXT4_SB(sb);
1681 const struct mount_opts *m;
08cefc7a
EB		 1682 kuid_t uid;
1683 kgid_t gid;
26092bf5
TT		 1684 int arg = 0;
1685
57f73c2c
TT		 1686#ifdef CONFIG_QUOTA
1687 if (token == Opt_usrjquota)
1688 return set_qf_name(sb, USRQUOTA, &args[0]);
1689 else if (token == Opt_grpjquota)
1690 return set_qf_name(sb, GRPQUOTA, &args[0]);
1691 else if (token == Opt_offusrjquota)
1692 return clear_qf_name(sb, USRQUOTA);
1693 else if (token == Opt_offgrpjquota)
1694 return clear_qf_name(sb, GRPQUOTA);
1695#endif
26092bf5 1696 switch (token) {
f7048605
TT		 1697 case Opt_noacl:
1698 case Opt_nouser_xattr:
1699 ext4_msg(sb, KERN_WARNING, deprecated_msg, opt, "3.5");
1700 break;
26092bf5
TT		 1701 case Opt_sb:
1702 return 1; /* handled by get_sb_block() */
1703 case Opt_removed:
5f3633e3 1704 ext4_msg(sb, KERN_WARNING, "Ignoring removed %s option", opt);
26092bf5 1705 return 1;
26092bf5
TT		 1706 case Opt_abort:
1707 sbi->s_mount_flags |= EXT4_MF_FS_ABORTED;
1708 return 1;
1709 case Opt_i_version:
357fdad0 1710 sb->s_flags |= SB_I_VERSION;
26092bf5 1711 return 1;
a26f4992 1712 case Opt_lazytime:
1751e8a6 1713 sb->s_flags |= SB_LAZYTIME;
a26f4992
TT		 1714 return 1;
1715 case Opt_nolazytime:
1751e8a6 1716 sb->s_flags &= ~SB_LAZYTIME;
a26f4992 1717 return 1;
26092bf5
TT		 1718 }
1719
5f3633e3
JK		 1720 for (m = ext4_mount_opts; m->token != Opt_err; m++)
1721 if (token == m->token)
1722 break;
1723
1724 if (m->token == Opt_err) {
1725 ext4_msg(sb, KERN_ERR, "Unrecognized mount option \"%s\" "
1726 "or missing value", opt);
1727 return -1;
1728 }
1729
8dc0aa8c
TT		 1730 if ((m->flags & MOPT_NO_EXT2) && IS_EXT2_SB(sb)) {
1731 ext4_msg(sb, KERN_ERR,
1732 "Mount option \"%s\" incompatible with ext2", opt);
1733 return -1;
1734 }
1735 if ((m->flags & MOPT_NO_EXT3) && IS_EXT3_SB(sb)) {
1736 ext4_msg(sb, KERN_ERR,
1737 "Mount option \"%s\" incompatible with ext3", opt);
1738 return -1;
1739 }
1740
ad4eec61 1741 if (args->from && !(m->flags & MOPT_STRING) && match_int(args, &arg))
5f3633e3
JK		 1742 return -1;
1743 if (args->from && (m->flags & MOPT_GTE0) && (arg < 0))
1744 return -1;
c93cf2d7
DM		 1745 if (m->flags & MOPT_EXPLICIT) {
1746 if (m->mount_opt & EXT4_MOUNT_DELALLOC) {
1747 set_opt2(sb, EXPLICIT_DELALLOC);
1e381f60
DM		 1748 } else if (m->mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) {
1749 set_opt2(sb, EXPLICIT_JOURNAL_CHECKSUM);
c93cf2d7
DM		 1750 } else
1751 return -1;
1752 }
5f3633e3
JK		 1753 if (m->flags & MOPT_CLEAR_ERR)
1754 clear_opt(sb, ERRORS_MASK);
1755 if (token == Opt_noquota && sb_any_quota_loaded(sb)) {
1756 ext4_msg(sb, KERN_ERR, "Cannot change quota "
1757 "options when quota turned on");
1758 return -1;
1759 }
1760
1761 if (m->flags & MOPT_NOSUPPORT) {
1762 ext4_msg(sb, KERN_ERR, "%s option not supported", opt);
1763 } else if (token == Opt_commit) {
1764 if (arg == 0)
1765 arg = JBD2_DEFAULT_MAX_COMMIT_AGE;
1766 sbi->s_commit_interval = HZ * arg;
670e9875
TT		 1767 } else if (token == Opt_debug_want_extra_isize) {
1768 sbi->s_want_extra_isize = arg;
5f3633e3 1769 } else if (token == Opt_max_batch_time) {
5f3633e3
JK		 1770 sbi->s_max_batch_time = arg;
1771 } else if (token == Opt_min_batch_time) {
1772 sbi->s_min_batch_time = arg;
1773 } else if (token == Opt_inode_readahead_blks) {
e33e60ea
JK		 1774 if (arg && (arg > (1 << 30) || !is_power_of_2(arg))) {
1775 ext4_msg(sb, KERN_ERR,
1776 "EXT4-fs: inode_readahead_blks must be "
1777 "0 or a power of 2 smaller than 2^31");
26092bf5 1778 return -1;
5f3633e3
JK		 1779 }
1780 sbi->s_inode_readahead_blks = arg;
1781 } else if (token == Opt_init_itable) {
1782 set_opt(sb, INIT_INODE_TABLE);
1783 if (!args->from)
1784 arg = EXT4_DEF_LI_WAIT_MULT;
1785 sbi->s_li_wait_mult = arg;
1786 } else if (token == Opt_max_dir_size_kb) {
1787 sbi->s_max_dir_size_kb = arg;
1788 } else if (token == Opt_stripe) {
1789 sbi->s_stripe = arg;
1790 } else if (token == Opt_resuid) {
1791 uid = make_kuid(current_user_ns(), arg);
1792 if (!uid_valid(uid)) {
1793 ext4_msg(sb, KERN_ERR, "Invalid uid value %d", arg);
26092bf5
TT		 1794 return -1;
1795 }
5f3633e3
JK		 1796 sbi->s_resuid = uid;
1797 } else if (token == Opt_resgid) {
1798 gid = make_kgid(current_user_ns(), arg);
1799 if (!gid_valid(gid)) {
1800 ext4_msg(sb, KERN_ERR, "Invalid gid value %d", arg);
1801 return -1;
1802 }
1803 sbi->s_resgid = gid;
1804 } else if (token == Opt_journal_dev) {
1805 if (is_remount) {
1806 ext4_msg(sb, KERN_ERR,
1807 "Cannot specify journal on remount");
1808 return -1;
1809 }
1810 *journal_devnum = arg;
ad4eec61
ES		 1811 } else if (token == Opt_journal_path) {
1812 char *journal_path;
1813 struct inode *journal_inode;
1814 struct path path;
1815 int error;
1816
1817 if (is_remount) {
1818 ext4_msg(sb, KERN_ERR,
1819 "Cannot specify journal on remount");
1820 return -1;
1821 }
1822 journal_path = match_strdup(&args[0]);
1823 if (!journal_path) {
1824 ext4_msg(sb, KERN_ERR, "error: could not dup "
1825 "journal device string");
1826 return -1;
1827 }
1828
1829 error = kern_path(journal_path, LOOKUP_FOLLOW, &path);
1830 if (error) {
1831 ext4_msg(sb, KERN_ERR, "error: could not find "
1832 "journal device path: error %d", error);
1833 kfree(journal_path);
1834 return -1;
1835 }
1836
2b0143b5 1837 journal_inode = d_inode(path.dentry);
ad4eec61
ES		 1838 if (!S_ISBLK(journal_inode->i_mode)) {
1839 ext4_msg(sb, KERN_ERR, "error: journal path %s "
1840 "is not a block device", journal_path);
1841 path_put(&path);
1842 kfree(journal_path);
1843 return -1;
1844 }
1845
1846 *journal_devnum = new_encode_dev(journal_inode->i_rdev);
1847 path_put(&path);
1848 kfree(journal_path);
5f3633e3
JK		 1849 } else if (token == Opt_journal_ioprio) {
1850 if (arg > 7) {
1851 ext4_msg(sb, KERN_ERR, "Invalid journal IO priority"
1852 " (must be 0-7)");
1853 return -1;
1854 }
1855 *journal_ioprio =
1856 IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, arg);
6ddb2447
TT		 1857 } else if (token == Opt_test_dummy_encryption) {
1858#ifdef CONFIG_EXT4_FS_ENCRYPTION
1859 sbi->s_mount_flags |= EXT4_MF_TEST_DUMMY_ENCRYPTION;
1860 ext4_msg(sb, KERN_WARNING,
1861 "Test dummy encryption mode enabled");
1862#else
1863 ext4_msg(sb, KERN_WARNING,
1864 "Test dummy encryption mount option ignored");
1865#endif
5f3633e3
JK		 1866 } else if (m->flags & MOPT_DATAJ) {
1867 if (is_remount) {
1868 if (!sbi->s_journal)
1869 ext4_msg(sb, KERN_WARNING, "Remounting file system with no journal so ignoring journalled data option");
1870 else if (test_opt(sb, DATA_FLAGS) != m->mount_opt) {
0efb3b23 1871 ext4_msg(sb, KERN_ERR,
26092bf5 1872 "Cannot change data mode on remount");
26092bf5 1873 return -1;
ac27a0ec 1874 }
26092bf5 1875 } else {
5f3633e3
JK		 1876 clear_opt(sb, DATA_FLAGS);
1877 sbi->s_mount_opt |= m->mount_opt;
ac27a0ec 1878 }
5f3633e3
JK		 1879#ifdef CONFIG_QUOTA
1880 } else if (m->flags & MOPT_QFMT) {
1881 if (sb_any_quota_loaded(sb) &&
1882 sbi->s_jquota_fmt != m->mount_opt) {
1883 ext4_msg(sb, KERN_ERR, "Cannot change journaled "
1884 "quota options when quota turned on");
1885 return -1;
1886 }
e2b911c5 1887 if (ext4_has_feature_quota(sb)) {
c325a67c
TT		 1888 ext4_msg(sb, KERN_INFO,
1889 "Quota format mount options ignored "
262b4662 1890 "when QUOTA feature is enabled");
c325a67c 1891 return 1;
262b4662 1892 }
5f3633e3 1893 sbi->s_jquota_fmt = m->mount_opt;
923ae0ff 1894#endif
923ae0ff 1895 } else if (token == Opt_dax) {
ef83b6e8
DW		 1896#ifdef CONFIG_FS_DAX
1897 ext4_msg(sb, KERN_WARNING,
1898 "DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
1899 sbi->s_mount_opt |= m->mount_opt;
1900#else
923ae0ff
RZ		 1901 ext4_msg(sb, KERN_INFO, "dax option not supported");
1902 return -1;
5f3633e3 1903#endif
7915a861
AN		 1904 } else if (token == Opt_data_err_abort) {
1905 sbi->s_mount_opt |= m->mount_opt;
1906 } else if (token == Opt_data_err_ignore) {
1907 sbi->s_mount_opt &= ~m->mount_opt;
5f3633e3
JK		 1908 } else {
1909 if (!args->from)
1910 arg = 1;
1911 if (m->flags & MOPT_CLEAR)
1912 arg = !arg;
1913 else if (unlikely(!(m->flags & MOPT_SET))) {
1914 ext4_msg(sb, KERN_WARNING,
1915 "buggy handling of option %s", opt);
1916 WARN_ON(1);
1917 return -1;
1918 }
1919 if (arg != 0)
1920 sbi->s_mount_opt |= m->mount_opt;
1921 else
1922 sbi->s_mount_opt &= ~m->mount_opt;
26092bf5 1923 }
5f3633e3 1924 return 1;
26092bf5
TT		 1925}
1926
1927static int parse_options(char *options, struct super_block *sb,
1928 unsigned long *journal_devnum,
1929 unsigned int *journal_ioprio,
1930 int is_remount)
1931{
1932 struct ext4_sb_info *sbi = EXT4_SB(sb);
1933 char *p;
1934 substring_t args[MAX_OPT_ARGS];
1935 int token;
1936
1937 if (!options)
1938 return 1;
1939
1940 while ((p = strsep(&options, ",")) != NULL) {
1941 if (!*p)
1942 continue;
1943 /*
1944 * Initialize args struct so we know whether arg was
1945 * found; some options take optional arguments.
1946 */
caecd0af 1947 args[0].to = args[0].from = NULL;
26092bf5
TT		 1948 token = match_token(p, tokens, args);
1949 if (handle_mount_opt(sb, p, token, args, journal_devnum,
1950 journal_ioprio, is_remount) < 0)
1951 return 0;
ac27a0ec
DK		 1952 }
1953#ifdef CONFIG_QUOTA
49da9392
JK		 1954 /*
1955 * We do the test below only for project quotas. 'usrquota' and
1956 * 'grpquota' mount options are allowed even without quota feature
1957 * to support legacy quotas in quota files.
1958 */
1959 if (test_opt(sb, PRJQUOTA) && !ext4_has_feature_project(sb)) {
1960 ext4_msg(sb, KERN_ERR, "Project quota feature not enabled. "
1961 "Cannot enable project quota enforcement.");
1962 return 0;
1963 }
1964 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
482a7425 1965 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
fd8c37ec 1966 clear_opt(sb, USRQUOTA);
ac27a0ec 1967
482a7425 1968 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
fd8c37ec 1969 clear_opt(sb, GRPQUOTA);
ac27a0ec 1970
56c50f11 1971 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
b31e1552
ES		 1972 ext4_msg(sb, KERN_ERR, "old and new quota "
1973 "format mixing");
ac27a0ec
DK		 1974 return 0;
1975 }
1976
1977 if (!sbi->s_jquota_fmt) {
b31e1552
ES		 1978 ext4_msg(sb, KERN_ERR, "journaled quota format "
1979 "not specified");
ac27a0ec
DK		 1980 return 0;
1981 }
ac27a0ec
DK		 1982 }
1983#endif
261cb20c
JK		 1984 if (test_opt(sb, DIOREAD_NOLOCK)) {
1985 int blocksize =
1986 BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);
1987
09cbfeaf 1988 if (blocksize < PAGE_SIZE) {
261cb20c
JK		 1989 ext4_msg(sb, KERN_ERR, "can't mount with "
1990 "dioread_nolock if block size != PAGE_SIZE");
1991 return 0;
1992 }
1993 }
ac27a0ec
DK		 1994 return 1;
1995}
1996
2adf6da8
TT		 1997static inline void ext4_show_quota_options(struct seq_file *seq,
1998 struct super_block *sb)
1999{
2000#if defined(CONFIG_QUOTA)
2001 struct ext4_sb_info *sbi = EXT4_SB(sb);
2002
2003 if (sbi->s_jquota_fmt) {
2004 char *fmtname = "";
2005
2006 switch (sbi->s_jquota_fmt) {
2007 case QFMT_VFS_OLD:
2008 fmtname = "vfsold";
2009 break;
2010 case QFMT_VFS_V0:
2011 fmtname = "vfsv0";
2012 break;
2013 case QFMT_VFS_V1:
2014 fmtname = "vfsv1";
2015 break;
2016 }
2017 seq_printf(seq, ",jqfmt=%s", fmtname);
2018 }
2019
2020 if (sbi->s_qf_names[USRQUOTA])
a068acf2 2021 seq_show_option(seq, "usrjquota", sbi->s_qf_names[USRQUOTA]);
2adf6da8
TT		 2022
2023 if (sbi->s_qf_names[GRPQUOTA])
a068acf2 2024 seq_show_option(seq, "grpjquota", sbi->s_qf_names[GRPQUOTA]);
2adf6da8
TT		 2025#endif
2026}
2027
5a916be1
TT		 2028static const char *token2str(int token)
2029{
50df9fd5 2030 const struct match_token *t;
5a916be1
TT		 2031
2032 for (t = tokens; t->token != Opt_err; t++)
2033 if (t->token == token && !strchr(t->pattern, '='))
2034 break;
2035 return t->pattern;
2036}
2037
2adf6da8
TT		 2038/*
2039 * Show an option if
2040 * - it's set to a non-default value OR
2041 * - if the per-sb default is different from the global default
2042 */
66acdcf4
TT		 2043static int _ext4_show_options(struct seq_file *seq, struct super_block *sb,
2044 int nodefs)
2adf6da8 2045{
2adf6da8
TT		 2046 struct ext4_sb_info *sbi = EXT4_SB(sb);
2047 struct ext4_super_block *es = sbi->s_es;
68afa7e0 2048 int def_errors, def_mount_opt = sbi->s_def_mount_opt;
5a916be1 2049 const struct mount_opts *m;
66acdcf4 2050 char sep = nodefs ? '\n' : ',';
2adf6da8 2051
66acdcf4
TT		 2052#define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep)
2053#define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg)
2adf6da8
TT		 2054
2055 if (sbi->s_sb_block != 1)
5a916be1
TT		 2056 SEQ_OPTS_PRINT("sb=%llu", sbi->s_sb_block);
2057
2058 for (m = ext4_mount_opts; m->token != Opt_err; m++) {
2059 int want_set = m->flags & MOPT_SET;
2060 if (((m->flags & (MOPT_SET|MOPT_CLEAR)) == 0) ||
2061 (m->flags & MOPT_CLEAR_ERR))
2062 continue;
68afa7e0 2063 if (!nodefs && !(m->mount_opt & (sbi->s_mount_opt ^ def_mount_opt)))
5a916be1
TT		 2064 continue; /* skip if same as the default */
2065 if ((want_set &&
2066 (sbi->s_mount_opt & m->mount_opt) != m->mount_opt) ||
2067 (!want_set && (sbi->s_mount_opt & m->mount_opt)))
2068 continue; /* select Opt_noFoo vs Opt_Foo */
2069 SEQ_OPTS_PRINT("%s", token2str(m->token));
2adf6da8 2070 }
5a916be1 2071
08cefc7a 2072 if (nodefs || !uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT4_DEF_RESUID)) ||
5a916be1 2073 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID)
08cefc7a
EB		 2074 SEQ_OPTS_PRINT("resuid=%u",
2075 from_kuid_munged(&init_user_ns, sbi->s_resuid));
2076 if (nodefs || !gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT4_DEF_RESGID)) ||
5a916be1 2077 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID)
08cefc7a
EB		 2078 SEQ_OPTS_PRINT("resgid=%u",
2079 from_kgid_munged(&init_user_ns, sbi->s_resgid));
66acdcf4 2080 def_errors = nodefs ? -1 : le16_to_cpu(es->s_errors);
5a916be1
TT		 2081 if (test_opt(sb, ERRORS_RO) && def_errors != EXT4_ERRORS_RO)
2082 SEQ_OPTS_PUTS("errors=remount-ro");
2adf6da8 2083 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
5a916be1 2084 SEQ_OPTS_PUTS("errors=continue");
2adf6da8 2085 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
5a916be1 2086 SEQ_OPTS_PUTS("errors=panic");
66acdcf4 2087 if (nodefs || sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ)
5a916be1 2088 SEQ_OPTS_PRINT("commit=%lu", sbi->s_commit_interval / HZ);
66acdcf4 2089 if (nodefs || sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME)
5a916be1 2090 SEQ_OPTS_PRINT("min_batch_time=%u", sbi->s_min_batch_time);
66acdcf4 2091 if (nodefs || sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME)
5a916be1 2092 SEQ_OPTS_PRINT("max_batch_time=%u", sbi->s_max_batch_time);
357fdad0 2093 if (sb->s_flags & SB_I_VERSION)
5a916be1 2094 SEQ_OPTS_PUTS("i_version");
66acdcf4 2095 if (nodefs || sbi->s_stripe)
5a916be1 2096 SEQ_OPTS_PRINT("stripe=%lu", sbi->s_stripe);
68afa7e0
TN		 2097 if (nodefs || EXT4_MOUNT_DATA_FLAGS &
2098 (sbi->s_mount_opt ^ def_mount_opt)) {
5a916be1
TT		 2099 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
2100 SEQ_OPTS_PUTS("data=journal");
2101 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
2102 SEQ_OPTS_PUTS("data=ordered");
2103 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
2104 SEQ_OPTS_PUTS("data=writeback");
2105 }
66acdcf4
TT		 2106 if (nodefs ||
2107 sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
5a916be1
TT		 2108 SEQ_OPTS_PRINT("inode_readahead_blks=%u",
2109 sbi->s_inode_readahead_blks);
2adf6da8 2110
ceec0376 2111 if (test_opt(sb, INIT_INODE_TABLE) && (nodefs ||
66acdcf4 2112 (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT)))
5a916be1 2113 SEQ_OPTS_PRINT("init_itable=%u", sbi->s_li_wait_mult);
df981d03
TT		 2114 if (nodefs || sbi->s_max_dir_size_kb)
2115 SEQ_OPTS_PRINT("max_dir_size_kb=%u", sbi->s_max_dir_size_kb);
7915a861
AN		 2116 if (test_opt(sb, DATA_ERR_ABORT))
2117 SEQ_OPTS_PUTS("data_err=abort");
2adf6da8
TT		 2118
2119 ext4_show_quota_options(seq, sb);
2adf6da8
TT		 2120 return 0;
2121}
2122
66acdcf4
TT		 2123static int ext4_show_options(struct seq_file *seq, struct dentry *root)
2124{
2125 return _ext4_show_options(seq, root->d_sb, 0);
2126}
2127
ebd173be 2128int ext4_seq_options_show(struct seq_file *seq, void *offset)
66acdcf4
TT		 2129{
2130 struct super_block *sb = seq->private;
2131 int rc;
2132
bc98a42c 2133 seq_puts(seq, sb_rdonly(sb) ? "ro" : "rw");
66acdcf4
TT		 2134 rc = _ext4_show_options(seq, sb, 1);
2135 seq_puts(seq, "\n");
2136 return rc;
2137}
2138
617ba13b 2139static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
ac27a0ec
DK		 2140 int read_only)
2141{
617ba13b 2142 struct ext4_sb_info *sbi = EXT4_SB(sb);
c89128a0 2143 int err = 0;
ac27a0ec 2144
617ba13b 2145 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
b31e1552
ES		 2146 ext4_msg(sb, KERN_ERR, "revision level too high, "
2147 "forcing read-only mode");
c89128a0 2148 err = -EROFS;
ac27a0ec
DK		 2149 }
2150 if (read_only)
281b5995 2151 goto done;
617ba13b 2152 if (!(sbi->s_mount_state & EXT4_VALID_FS))
b31e1552
ES		 2153 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
2154 "running e2fsck is recommended");
c8b459f4 2155 else if (sbi->s_mount_state & EXT4_ERROR_FS)
b31e1552
ES		 2156 ext4_msg(sb, KERN_WARNING,
2157 "warning: mounting fs with errors, "
2158 "running e2fsck is recommended");
ed3ce80a 2159 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
ac27a0ec
DK		 2160 le16_to_cpu(es->s_mnt_count) >=
2161 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
b31e1552
ES		 2162 ext4_msg(sb, KERN_WARNING,
2163 "warning: maximal mount count reached, "
2164 "running e2fsck is recommended");
ac27a0ec
DK		 2165 else if (le32_to_cpu(es->s_checkinterval) &&
2166 (le32_to_cpu(es->s_lastcheck) +
2167 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
b31e1552
ES		 2168 ext4_msg(sb, KERN_WARNING,
2169 "warning: checktime reached, "
2170 "running e2fsck is recommended");
0b8e58a1 2171 if (!sbi->s_journal)
0390131b 2172 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
ac27a0ec 2173 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
617ba13b 2174 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
e8546d06 2175 le16_add_cpu(&es->s_mnt_count, 1);
ac27a0ec 2176 es->s_mtime = cpu_to_le32(get_seconds());
617ba13b 2177 ext4_update_dynamic_rev(sb);
0390131b 2178 if (sbi->s_journal)
e2b911c5 2179 ext4_set_feature_journal_needs_recovery(sb);
ac27a0ec 2180
c89128a0 2181 err = ext4_commit_super(sb, 1);
281b5995 2182done:
ac27a0ec 2183 if (test_opt(sb, DEBUG))
a9df9a49 2184 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
a2595b8a 2185 "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
ac27a0ec
DK		 2186 sb->s_blocksize,
2187 sbi->s_groups_count,
617ba13b
MC		 2188 EXT4_BLOCKS_PER_GROUP(sb),
2189 EXT4_INODES_PER_GROUP(sb),
a2595b8a 2190 sbi->s_mount_opt, sbi->s_mount_opt2);
ac27a0ec 2191
7abc52c2 2192 cleancache_init_fs(sb);
c89128a0 2193 return err;
ac27a0ec
DK		 2194}
2195
117fff10
TT		 2196int ext4_alloc_flex_bg_array(struct super_block *sb, ext4_group_t ngroup)
2197{
2198 struct ext4_sb_info *sbi = EXT4_SB(sb);
2199 struct flex_groups *new_groups;
2200 int size;
2201
2202 if (!sbi->s_log_groups_per_flex)
2203 return 0;
2204
2205 size = ext4_flex_group(sbi, ngroup - 1) + 1;
2206 if (size <= sbi->s_flex_groups_allocated)
2207 return 0;
2208
2209 size = roundup_pow_of_two(size * sizeof(struct flex_groups));
a7c3e901 2210 new_groups = kvzalloc(size, GFP_KERNEL);
117fff10
TT		 2211 if (!new_groups) {
2212 ext4_msg(sb, KERN_ERR, "not enough memory for %d flex groups",
2213 size / (int) sizeof(struct flex_groups));
2214 return -ENOMEM;
2215 }
2216
2217 if (sbi->s_flex_groups) {
2218 memcpy(new_groups, sbi->s_flex_groups,
2219 (sbi->s_flex_groups_allocated *
2220 sizeof(struct flex_groups)));
b93b41d4 2221 kvfree(sbi->s_flex_groups);
117fff10
TT		 2222 }
2223 sbi->s_flex_groups = new_groups;
2224 sbi->s_flex_groups_allocated = size / sizeof(struct flex_groups);
2225 return 0;
2226}
2227
772cb7c8
JS		 2228static int ext4_fill_flex_info(struct super_block *sb)
2229{
2230 struct ext4_sb_info *sbi = EXT4_SB(sb);
2231 struct ext4_group_desc *gdp = NULL;
772cb7c8 2232 ext4_group_t flex_group;
117fff10 2233 int i, err;
772cb7c8 2234
503358ae 2235 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
d50f2ab6 2236 if (sbi->s_log_groups_per_flex < 1 || sbi->s_log_groups_per_flex > 31) {
772cb7c8
JS		 2237 sbi->s_log_groups_per_flex = 0;
2238 return 1;
2239 }
2240
117fff10
TT		 2241 err = ext4_alloc_flex_bg_array(sb, sbi->s_groups_count);
2242 if (err)
9933fc0a 2243 goto failed;
772cb7c8 2244
772cb7c8 2245 for (i = 0; i < sbi->s_groups_count; i++) {
88b6edd1 2246 gdp = ext4_get_group_desc(sb, i, NULL);
772cb7c8
JS		 2247
2248 flex_group = ext4_flex_group(sbi, i);
7ad9bb65
TT		 2249 atomic_add(ext4_free_inodes_count(sb, gdp),
2250 &sbi->s_flex_groups[flex_group].free_inodes);
90ba983f
TT		 2251 atomic64_add(ext4_free_group_clusters(sb, gdp),
2252 &sbi->s_flex_groups[flex_group].free_clusters);
7ad9bb65
TT		 2253 atomic_add(ext4_used_dirs_count(sb, gdp),
2254 &sbi->s_flex_groups[flex_group].used_dirs);
772cb7c8
JS		 2255 }
2256
2257 return 1;
2258failed:
2259 return 0;
2260}
2261
e2b911c5 2262static __le16 ext4_group_desc_csum(struct super_block *sb, __u32 block_group,
feb0ab32 2263 struct ext4_group_desc *gdp)
717d50e4 2264{
b47820ed 2265 int offset = offsetof(struct ext4_group_desc, bg_checksum);
717d50e4 2266 __u16 crc = 0;
feb0ab32 2267 __le32 le_group = cpu_to_le32(block_group);
e2b911c5 2268 struct ext4_sb_info *sbi = EXT4_SB(sb);
717d50e4 2269
9aa5d32b 2270 if (ext4_has_metadata_csum(sbi->s_sb)) {
feb0ab32 2271 /* Use new metadata_csum algorithm */
feb0ab32 2272 __u32 csum32;
b47820ed 2273 __u16 dummy_csum = 0;
feb0ab32 2274
feb0ab32
DW		 2275 csum32 = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&le_group,
2276 sizeof(le_group));
b47820ed
DJ		 2277 csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp, offset);
2278 csum32 = ext4_chksum(sbi, csum32, (__u8 *)&dummy_csum,
2279 sizeof(dummy_csum));
2280 offset += sizeof(dummy_csum);
2281 if (offset < sbi->s_desc_size)
2282 csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp + offset,
2283 sbi->s_desc_size - offset);
feb0ab32
DW		 2284
2285 crc = csum32 & 0xFFFF;
2286 goto out;
717d50e4
AD		 2287 }
2288
feb0ab32 2289 /* old crc16 code */
e2b911c5 2290 if (!ext4_has_feature_gdt_csum(sb))
813d32f9
DW		 2291 return 0;
2292
feb0ab32
DW		 2293 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
2294 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
2295 crc = crc16(crc, (__u8 *)gdp, offset);
2296 offset += sizeof(gdp->bg_checksum); /* skip checksum */
2297 /* for checksum of struct ext4_group_desc do the rest...*/
e2b911c5 2298 if (ext4_has_feature_64bit(sb) &&
feb0ab32
DW		 2299 offset < le16_to_cpu(sbi->s_es->s_desc_size))
2300 crc = crc16(crc, (__u8 *)gdp + offset,
2301 le16_to_cpu(sbi->s_es->s_desc_size) -
2302 offset);
2303
2304out:
717d50e4
AD		 2305 return cpu_to_le16(crc);
2306}
2307
feb0ab32 2308int ext4_group_desc_csum_verify(struct super_block *sb, __u32 block_group,
717d50e4
AD		 2309 struct ext4_group_desc *gdp)
2310{
feb0ab32 2311 if (ext4_has_group_desc_csum(sb) &&
e2b911c5 2312 (gdp->bg_checksum != ext4_group_desc_csum(sb, block_group, gdp)))
717d50e4
AD		 2313 return 0;
2314
2315 return 1;
2316}
2317
feb0ab32
DW		 2318void ext4_group_desc_csum_set(struct super_block *sb, __u32 block_group,
2319 struct ext4_group_desc *gdp)
2320{
2321 if (!ext4_has_group_desc_csum(sb))
2322 return;
e2b911c5 2323 gdp->bg_checksum = ext4_group_desc_csum(sb, block_group, gdp);
feb0ab32
DW		 2324}
2325
ac27a0ec 2326/* Called at mount-time, super-block is locked */
bfff6873 2327static int ext4_check_descriptors(struct super_block *sb,
829fa70d 2328 ext4_fsblk_t sb_block,
bfff6873 2329 ext4_group_t *first_not_zeroed)
ac27a0ec 2330{
617ba13b
MC		 2331 struct ext4_sb_info *sbi = EXT4_SB(sb);
2332 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
2333 ext4_fsblk_t last_block;
bd81d8ee
LV		 2334 ext4_fsblk_t block_bitmap;
2335 ext4_fsblk_t inode_bitmap;
2336 ext4_fsblk_t inode_table;
ce421581 2337 int flexbg_flag = 0;
bfff6873 2338 ext4_group_t i, grp = sbi->s_groups_count;
ac27a0ec 2339
e2b911c5 2340 if (ext4_has_feature_flex_bg(sb))
ce421581
JS		 2341 flexbg_flag = 1;
2342
af5bc92d 2343 ext4_debug("Checking group descriptors");
ac27a0ec 2344
197cd65a
AM		 2345 for (i = 0; i < sbi->s_groups_count; i++) {
2346 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
2347
ce421581 2348 if (i == sbi->s_groups_count - 1 || flexbg_flag)
bd81d8ee 2349 last_block = ext4_blocks_count(sbi->s_es) - 1;
ac27a0ec
DK		 2350 else
2351 last_block = first_block +
617ba13b 2352 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
ac27a0ec 2353
bfff6873
LC		 2354 if ((grp == sbi->s_groups_count) &&
2355 !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2356 grp = i;
2357
8fadc143 2358 block_bitmap = ext4_block_bitmap(sb, gdp);
829fa70d
TT		 2359 if (block_bitmap == sb_block) {
2360 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2361 "Block bitmap for group %u overlaps "
2362 "superblock", i);
18db4b4e
TT		 2363 if (!sb_rdonly(sb))
2364 return 0;
829fa70d 2365 }
2b2d6d01 2366 if (block_bitmap < first_block || block_bitmap > last_block) {
b31e1552 2367 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2368 "Block bitmap for group %u not in group "
b31e1552 2369 "(block %llu)!", i, block_bitmap);
ac27a0ec
DK		 2370 return 0;
2371 }
8fadc143 2372 inode_bitmap = ext4_inode_bitmap(sb, gdp);
829fa70d
TT		 2373 if (inode_bitmap == sb_block) {
2374 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2375 "Inode bitmap for group %u overlaps "
2376 "superblock", i);
18db4b4e
TT		 2377 if (!sb_rdonly(sb))
2378 return 0;
829fa70d 2379 }
2b2d6d01 2380 if (inode_bitmap < first_block || inode_bitmap > last_block) {
b31e1552 2381 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2382 "Inode bitmap for group %u not in group "
b31e1552 2383 "(block %llu)!", i, inode_bitmap);
ac27a0ec
DK		 2384 return 0;
2385 }
8fadc143 2386 inode_table = ext4_inode_table(sb, gdp);
829fa70d
TT		 2387 if (inode_table == sb_block) {
2388 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2389 "Inode table for group %u overlaps "
2390 "superblock", i);
18db4b4e
TT		 2391 if (!sb_rdonly(sb))
2392 return 0;
829fa70d 2393 }
bd81d8ee 2394 if (inode_table < first_block ||
2b2d6d01 2395 inode_table + sbi->s_itb_per_group - 1 > last_block) {
b31e1552 2396 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2397 "Inode table for group %u not in group "
b31e1552 2398 "(block %llu)!", i, inode_table);
ac27a0ec
DK		 2399 return 0;
2400 }
955ce5f5 2401 ext4_lock_group(sb, i);
feb0ab32 2402 if (!ext4_group_desc_csum_verify(sb, i, gdp)) {
b31e1552
ES		 2403 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2404 "Checksum for group %u failed (%u!=%u)",
e2b911c5 2405 i, le16_to_cpu(ext4_group_desc_csum(sb, i,
b31e1552 2406 gdp)), le16_to_cpu(gdp->bg_checksum));
bc98a42c 2407 if (!sb_rdonly(sb)) {
955ce5f5 2408 ext4_unlock_group(sb, i);
8a266467 2409 return 0;
7ee1ec4c 2410 }
717d50e4 2411 }
955ce5f5 2412 ext4_unlock_group(sb, i);
ce421581
JS		 2413 if (!flexbg_flag)
2414 first_block += EXT4_BLOCKS_PER_GROUP(sb);
ac27a0ec 2415 }
bfff6873
LC		 2416 if (NULL != first_not_zeroed)
2417 *first_not_zeroed = grp;
ac27a0ec
DK		 2418 return 1;
2419}
2420
617ba13b 2421/* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
ac27a0ec
DK		 2422 * the superblock) which were deleted from all directories, but held open by
2423 * a process at the time of a crash. We walk the list and try to delete these
2424 * inodes at recovery time (only with a read-write filesystem).
2425 *
2426 * In order to keep the orphan inode chain consistent during traversal (in
2427 * case of crash during recovery), we link each inode into the superblock
2428 * orphan list_head and handle it the same way as an inode deletion during
2429 * normal operation (which journals the operations for us).
2430 *
2431 * We only do an iget() and an iput() on each inode, which is very safe if we
2432 * accidentally point at an in-use or already deleted inode. The worst that
2433 * can happen in this case is that we get a "bit already cleared" message from
617ba13b 2434 * ext4_free_inode(). The only reason we would point at a wrong inode is if
ac27a0ec
DK		 2435 * e2fsck was run on this filesystem, and it must have already done the orphan
2436 * inode cleanup for us, so we can safely abort without any further action.
2437 */
2b2d6d01
TT		 2438static void ext4_orphan_cleanup(struct super_block *sb,
2439 struct ext4_super_block *es)
ac27a0ec
DK		 2440{
2441 unsigned int s_flags = sb->s_flags;
2c98eb5e 2442 int ret, nr_orphans = 0, nr_truncates = 0;
ac27a0ec 2443#ifdef CONFIG_QUOTA
95f1fda4 2444 int quota_update = 0;
ac27a0ec
DK		 2445 int i;
2446#endif
2447 if (!es->s_last_orphan) {
2448 jbd_debug(4, "no orphan inodes to clean up\n");
2449 return;
2450 }
2451
a8f48a95 2452 if (bdev_read_only(sb->s_bdev)) {
b31e1552
ES		 2453 ext4_msg(sb, KERN_ERR, "write access "
2454 "unavailable, skipping orphan cleanup");
a8f48a95
ES		 2455 return;
2456 }
2457
d39195c3
AG		 2458 /* Check if feature set would not allow a r/w mount */
2459 if (!ext4_feature_set_ok(sb, 0)) {
2460 ext4_msg(sb, KERN_INFO, "Skipping orphan cleanup due to "
2461 "unknown ROCOMPAT features");
2462 return;
2463 }
2464
617ba13b 2465 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
c25f9bc6 2466 /* don't clear list on RO mount w/ errors */
1751e8a6 2467 if (es->s_last_orphan && !(s_flags & SB_RDONLY)) {
84474976 2468 ext4_msg(sb, KERN_INFO, "Errors on filesystem, "
ac27a0ec 2469 "clearing orphan list.\n");
c25f9bc6
ES		 2470 es->s_last_orphan = 0;
2471 }
ac27a0ec
DK		 2472 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2473 return;
2474 }
2475
1751e8a6 2476 if (s_flags & SB_RDONLY) {
b31e1552 2477 ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
1751e8a6 2478 sb->s_flags &= ~SB_RDONLY;
ac27a0ec
DK		 2479 }
2480#ifdef CONFIG_QUOTA
2481 /* Needed for iput() to work correctly and not trash data */
1751e8a6 2482 sb->s_flags |= SB_ACTIVE;
95f1fda4 2483
2484 /*
2485 * Turn on quotas which were not enabled for read-only mounts if
2486 * filesystem has quota feature, so that they are updated correctly.
2487 */
1751e8a6 2488 if (ext4_has_feature_quota(sb) && (s_flags & SB_RDONLY)) {
95f1fda4 2489 int ret = ext4_enable_quotas(sb);
2490
2491 if (!ret)
2492 quota_update = 1;
2493 else
2494 ext4_msg(sb, KERN_ERR,
2495 "Cannot turn on quotas: error %d", ret);
2496 }
2497
2498 /* Turn on journaled quotas used for old sytle */
a2d4a646 2499 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
617ba13b
MC		 2500 if (EXT4_SB(sb)->s_qf_names[i]) {
2501 int ret = ext4_quota_on_mount(sb, i);
95f1fda4 2502
2503 if (!ret)
2504 quota_update = 1;
2505 else
b31e1552
ES		 2506 ext4_msg(sb, KERN_ERR,
2507 "Cannot turn on journaled "
95f1fda4 2508 "quota: type %d: error %d", i, ret);
ac27a0ec
DK		 2509 }
2510 }
2511#endif
2512
2513 while (es->s_last_orphan) {
2514 struct inode *inode;
2515
c65d5c6c
VN		 2516 /*
2517 * We may have encountered an error during cleanup; if
2518 * so, skip the rest.
2519 */
2520 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
2521 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2522 es->s_last_orphan = 0;
2523 break;
2524 }
2525
97bd42b9
JB		 2526 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
2527 if (IS_ERR(inode)) {
ac27a0ec
DK		 2528 es->s_last_orphan = 0;
2529 break;
2530 }
2531
617ba13b 2532 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
871a2931 2533 dquot_initialize(inode);
ac27a0ec 2534 if (inode->i_nlink) {
566370a2
PT		 2535 if (test_opt(sb, DEBUG))
2536 ext4_msg(sb, KERN_DEBUG,
2537 "%s: truncating inode %lu to %lld bytes",
2538 __func__, inode->i_ino, inode->i_size);
e5f8eab8 2539 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
ac27a0ec 2540 inode->i_ino, inode->i_size);
5955102c 2541 inode_lock(inode);
55f252c9 2542 truncate_inode_pages(inode->i_mapping, inode->i_size);
2c98eb5e
TT		 2543 ret = ext4_truncate(inode);
2544 if (ret)
2545 ext4_std_error(inode->i_sb, ret);
5955102c 2546 inode_unlock(inode);
ac27a0ec
DK		 2547 nr_truncates++;
2548 } else {
566370a2
PT		 2549 if (test_opt(sb, DEBUG))
2550 ext4_msg(sb, KERN_DEBUG,
2551 "%s: deleting unreferenced inode %lu",
2552 __func__, inode->i_ino);
ac27a0ec
DK		 2553 jbd_debug(2, "deleting unreferenced inode %lu\n",
2554 inode->i_ino);
2555 nr_orphans++;
2556 }
2557 iput(inode); /* The delete magic happens here! */
2558 }
2559
2b2d6d01 2560#define PLURAL(x) (x), ((x) == 1) ? "" : "s"
ac27a0ec
DK		 2561
2562 if (nr_orphans)
b31e1552
ES		 2563 ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
2564 PLURAL(nr_orphans));
ac27a0ec 2565 if (nr_truncates)
b31e1552
ES		 2566 ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
2567 PLURAL(nr_truncates));
ac27a0ec 2568#ifdef CONFIG_QUOTA
95f1fda4 2569 /* Turn off quotas if they were enabled for orphan cleanup */
2570 if (quota_update) {
2571 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
2572 if (sb_dqopt(sb)->files[i])
2573 dquot_quota_off(sb, i);
2574 }
ac27a0ec
DK		 2575 }
2576#endif
1751e8a6 2577 sb->s_flags = s_flags; /* Restore SB_RDONLY status */
ac27a0ec 2578}
0b8e58a1 2579
cd2291a4
ES		 2580/*
2581 * Maximal extent format file size.
2582 * Resulting logical blkno at s_maxbytes must fit in our on-disk
2583 * extent format containers, within a sector_t, and within i_blocks
2584 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
2585 * so that won't be a limiting factor.
2586 *
f17722f9
LC		 2587 * However there is other limiting factor. We do store extents in the form
2588 * of starting block and length, hence the resulting length of the extent
2589 * covering maximum file size must fit into on-disk format containers as
2590 * well. Given that length is always by 1 unit bigger than max unit (because
2591 * we count 0 as well) we have to lower the s_maxbytes by one fs block.
2592 *
cd2291a4
ES		 2593 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
2594 */
f287a1a5 2595static loff_t ext4_max_size(int blkbits, int has_huge_files)
cd2291a4
ES		 2596{
2597 loff_t res;
2598 loff_t upper_limit = MAX_LFS_FILESIZE;
2599
2600 /* small i_blocks in vfs inode? */
f287a1a5 2601 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
cd2291a4 2602 /*
90c699a9 2603 * CONFIG_LBDAF is not enabled implies the inode
cd2291a4
ES		 2604 * i_block represent total blocks in 512 bytes
2605 * 32 == size of vfs inode i_blocks * 8
2606 */
2607 upper_limit = (1LL << 32) - 1;
2608
2609 /* total blocks in file system block size */
2610 upper_limit >>= (blkbits - 9);
2611 upper_limit <<= blkbits;
2612 }
2613
f17722f9
LC		 2614 /*
2615 * 32-bit extent-start container, ee_block. We lower the maxbytes
2616 * by one fs block, so ee_len can cover the extent of maximum file
2617 * size
2618 */
2619 res = (1LL << 32) - 1;
cd2291a4 2620 res <<= blkbits;
cd2291a4
ES		 2621
2622 /* Sanity check against vm- & vfs- imposed limits */
2623 if (res > upper_limit)
2624 res = upper_limit;
2625
2626 return res;
2627}
ac27a0ec 2628
ac27a0ec 2629/*
cd2291a4 2630 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
0fc1b451
AK		 2631 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2632 * We need to be 1 filesystem block less than the 2^48 sector limit.
ac27a0ec 2633 */
f287a1a5 2634static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
ac27a0ec 2635{
617ba13b 2636 loff_t res = EXT4_NDIR_BLOCKS;
0fc1b451
AK		 2637 int meta_blocks;
2638 loff_t upper_limit;
0b8e58a1
AD		 2639 /* This is calculated to be the largest file size for a dense, block
2640 * mapped file such that the file's total number of 512-byte sectors,
2641 * including data and all indirect blocks, does not exceed (2^48 - 1).
2642 *
2643 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2644 * number of 512-byte sectors of the file.
0fc1b451
AK		 2645 */
2646
f287a1a5 2647 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
0fc1b451 2648 /*
90c699a9 2649 * !has_huge_files or CONFIG_LBDAF not enabled implies that
0b8e58a1
AD		 2650 * the inode i_block field represents total file blocks in
2651 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
0fc1b451
AK		 2652 */
2653 upper_limit = (1LL << 32) - 1;
2654
2655 /* total blocks in file system block size */
2656 upper_limit >>= (bits - 9);
2657
2658 } else {
8180a562
AK		 2659 /*
2660 * We use 48 bit ext4_inode i_blocks
2661 * With EXT4_HUGE_FILE_FL set the i_blocks
2662 * represent total number of blocks in
2663 * file system block size
2664 */
0fc1b451
AK		 2665 upper_limit = (1LL << 48) - 1;
2666
0fc1b451
AK		 2667 }
2668
2669 /* indirect blocks */
2670 meta_blocks = 1;
2671 /* double indirect blocks */
2672 meta_blocks += 1 + (1LL << (bits-2));
2673 /* tripple indirect blocks */
2674 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
2675
2676 upper_limit -= meta_blocks;
2677 upper_limit <<= bits;
ac27a0ec
DK		 2678
2679 res += 1LL << (bits-2);
2680 res += 1LL << (2*(bits-2));
2681 res += 1LL << (3*(bits-2));
2682 res <<= bits;
2683 if (res > upper_limit)
2684 res = upper_limit;
0fc1b451
AK		 2685
2686 if (res > MAX_LFS_FILESIZE)
2687 res = MAX_LFS_FILESIZE;
2688
ac27a0ec
DK		 2689 return res;
2690}
2691
617ba13b 2692static ext4_fsblk_t descriptor_loc(struct super_block *sb,
0b8e58a1 2693 ext4_fsblk_t logical_sb_block, int nr)
ac27a0ec 2694{
617ba13b 2695 struct ext4_sb_info *sbi = EXT4_SB(sb);
fd2d4291 2696 ext4_group_t bg, first_meta_bg;
ac27a0ec
DK		 2697 int has_super = 0;
2698
2699 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
2700
e2b911c5 2701 if (!ext4_has_feature_meta_bg(sb) || nr < first_meta_bg)
70bbb3e0 2702 return logical_sb_block + nr + 1;
ac27a0ec 2703 bg = sbi->s_desc_per_block * nr;
617ba13b 2704 if (ext4_bg_has_super(sb, bg))
ac27a0ec 2705 has_super = 1;
0b8e58a1 2706
bd63f6b0
DW		 2707 /*
2708 * If we have a meta_bg fs with 1k blocks, group 0's GDT is at
2709 * block 2, not 1. If s_first_data_block == 0 (bigalloc is enabled
2710 * on modern mke2fs or blksize > 1k on older mke2fs) then we must
2711 * compensate.
2712 */
2713 if (sb->s_blocksize == 1024 && nr == 0 &&
49598e04 2714 le32_to_cpu(sbi->s_es->s_first_data_block) == 0)
bd63f6b0
DW		 2715 has_super++;
2716
617ba13b 2717 return (has_super + ext4_group_first_block_no(sb, bg));
ac27a0ec
DK		 2718}
2719
c9de560d
AT		 2720/**
2721 * ext4_get_stripe_size: Get the stripe size.
2722 * @sbi: In memory super block info
2723 *
2724 * If we have specified it via mount option, then
2725 * use the mount option value. If the value specified at mount time is
2726 * greater than the blocks per group use the super block value.
2727 * If the super block value is greater than blocks per group return 0.
2728 * Allocator needs it be less than blocks per group.
2729 *
2730 */
2731static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
2732{
2733 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
2734 unsigned long stripe_width =
2735 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
3eb08658 2736 int ret;
c9de560d
AT		 2737
2738 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
3eb08658 2739 ret = sbi->s_stripe;
5469d7c3 2740 else if (stripe_width && stripe_width <= sbi->s_blocks_per_group)
3eb08658 2741 ret = stripe_width;
5469d7c3 2742 else if (stride && stride <= sbi->s_blocks_per_group)
3eb08658
DE		 2743 ret = stride;
2744 else
2745 ret = 0;
c9de560d 2746
3eb08658
DE		 2747 /*
2748 * If the stripe width is 1, this makes no sense and
2749 * we set it to 0 to turn off stripe handling code.
2750 */
2751 if (ret <= 1)
2752 ret = 0;
c9de560d 2753
3eb08658 2754 return ret;
c9de560d 2755}
ac27a0ec 2756
a13fb1a4
ES		 2757/*
2758 * Check whether this filesystem can be mounted based on
2759 * the features present and the RDONLY/RDWR mount requested.
2760 * Returns 1 if this filesystem can be mounted as requested,
2761 * 0 if it cannot be.
2762 */
2763static int ext4_feature_set_ok(struct super_block *sb, int readonly)
2764{
e2b911c5 2765 if (ext4_has_unknown_ext4_incompat_features(sb)) {
a13fb1a4
ES		 2766 ext4_msg(sb, KERN_ERR,
2767 "Couldn't mount because of "
2768 "unsupported optional features (%x)",
2769 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
2770 ~EXT4_FEATURE_INCOMPAT_SUPP));
2771 return 0;
2772 }
2773
2774 if (readonly)
2775 return 1;
2776
e2b911c5 2777 if (ext4_has_feature_readonly(sb)) {
2cb5cc8b 2778 ext4_msg(sb, KERN_INFO, "filesystem is read-only");
1751e8a6 2779 sb->s_flags |= SB_RDONLY;
2cb5cc8b
DW		 2780 return 1;
2781 }
2782
a13fb1a4 2783 /* Check that feature set is OK for a read-write mount */
e2b911c5 2784 if (ext4_has_unknown_ext4_ro_compat_features(sb)) {
a13fb1a4
ES		 2785 ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of "
2786 "unsupported optional features (%x)",
2787 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
2788 ~EXT4_FEATURE_RO_COMPAT_SUPP));
2789 return 0;
2790 }
2791 /*
2792 * Large file size enabled file system can only be mounted
2793 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
2794 */
e2b911c5 2795 if (ext4_has_feature_huge_file(sb)) {
a13fb1a4
ES		 2796 if (sizeof(blkcnt_t) < sizeof(u64)) {
2797 ext4_msg(sb, KERN_ERR, "Filesystem with huge files "
2798 "cannot be mounted RDWR without "
2799 "CONFIG_LBDAF");
2800 return 0;
2801 }
2802 }
e2b911c5 2803 if (ext4_has_feature_bigalloc(sb) && !ext4_has_feature_extents(sb)) {
bab08ab9
TT		 2804 ext4_msg(sb, KERN_ERR,
2805 "Can't support bigalloc feature without "
2806 "extents feature\n");
2807 return 0;
2808 }
7c319d32
AK		 2809
2810#ifndef CONFIG_QUOTA
e2b911c5 2811 if (ext4_has_feature_quota(sb) && !readonly) {
7c319d32
AK		 2812 ext4_msg(sb, KERN_ERR,
2813 "Filesystem with quota feature cannot be mounted RDWR "
2814 "without CONFIG_QUOTA");
2815 return 0;
2816 }
689c958c
LX		 2817 if (ext4_has_feature_project(sb) && !readonly) {
2818 ext4_msg(sb, KERN_ERR,
2819 "Filesystem with project quota feature cannot be mounted RDWR "
2820 "without CONFIG_QUOTA");
2821 return 0;
2822 }
7c319d32 2823#endif /* CONFIG_QUOTA */
a13fb1a4
ES		 2824 return 1;
2825}
2826
66e61a9e
TT		 2827/*
2828 * This function is called once a day if we have errors logged
2829 * on the file system
2830 */
235699a8 2831static void print_daily_error_info(struct timer_list *t)
66e61a9e 2832{
235699a8
KC		 2833 struct ext4_sb_info *sbi = from_timer(sbi, t, s_err_report);
2834 struct super_block *sb = sbi->s_sb;
2835 struct ext4_super_block *es = sbi->s_es;
66e61a9e
TT		 2836
2837 if (es->s_error_count)
ae0f78de
TT		 2838 /* fsck newer than v1.41.13 is needed to clean this condition. */
2839 ext4_msg(sb, KERN_NOTICE, "error count since last fsck: %u",
66e61a9e
TT		 2840 le32_to_cpu(es->s_error_count));
2841 if (es->s_first_error_time) {
ae0f78de 2842 printk(KERN_NOTICE "EXT4-fs (%s): initial error at time %u: %.*s:%d",
66e61a9e
TT		 2843 sb->s_id, le32_to_cpu(es->s_first_error_time),
2844 (int) sizeof(es->s_first_error_func),
2845 es->s_first_error_func,
2846 le32_to_cpu(es->s_first_error_line));
2847 if (es->s_first_error_ino)
651e1c3b 2848 printk(KERN_CONT ": inode %u",
66e61a9e
TT		 2849 le32_to_cpu(es->s_first_error_ino));
2850 if (es->s_first_error_block)
651e1c3b 2851 printk(KERN_CONT ": block %llu", (unsigned long long)
66e61a9e 2852 le64_to_cpu(es->s_first_error_block));
651e1c3b 2853 printk(KERN_CONT "\n");
66e61a9e
TT		 2854 }
2855 if (es->s_last_error_time) {
ae0f78de 2856 printk(KERN_NOTICE "EXT4-fs (%s): last error at time %u: %.*s:%d",
66e61a9e
TT		 2857 sb->s_id, le32_to_cpu(es->s_last_error_time),
2858 (int) sizeof(es->s_last_error_func),
2859 es->s_last_error_func,
2860 le32_to_cpu(es->s_last_error_line));
2861 if (es->s_last_error_ino)
651e1c3b 2862 printk(KERN_CONT ": inode %u",
66e61a9e
TT		 2863 le32_to_cpu(es->s_last_error_ino));
2864 if (es->s_last_error_block)
651e1c3b 2865 printk(KERN_CONT ": block %llu", (unsigned long long)
66e61a9e 2866 le64_to_cpu(es->s_last_error_block));
651e1c3b 2867 printk(KERN_CONT "\n");
66e61a9e
TT		 2868 }
2869 mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ); /* Once a day */
2870}
2871
bfff6873
LC		 2872/* Find next suitable group and run ext4_init_inode_table */
2873static int ext4_run_li_request(struct ext4_li_request *elr)
2874{
2875 struct ext4_group_desc *gdp = NULL;
2876 ext4_group_t group, ngroups;
2877 struct super_block *sb;
2878 unsigned long timeout = 0;
2879 int ret = 0;
2880
2881 sb = elr->lr_super;
2882 ngroups = EXT4_SB(sb)->s_groups_count;
2883
2884 for (group = elr->lr_next_group; group < ngroups; group++) {
2885 gdp = ext4_get_group_desc(sb, group, NULL);
2886 if (!gdp) {
2887 ret = 1;
2888 break;
2889 }
2890
2891 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2892 break;
2893 }
2894
7f511862 2895 if (group >= ngroups)
bfff6873
LC		 2896 ret = 1;
2897
2898 if (!ret) {
2899 timeout = jiffies;
2900 ret = ext4_init_inode_table(sb, group,
2901 elr->lr_timeout ? 0 : 1);
2902 if (elr->lr_timeout == 0) {
51ce6511
LC		 2903 timeout = (jiffies - timeout) *
2904 elr->lr_sbi->s_li_wait_mult;
bfff6873
LC		 2905 elr->lr_timeout = timeout;
2906 }
2907 elr->lr_next_sched = jiffies + elr->lr_timeout;
2908 elr->lr_next_group = group + 1;
2909 }
bfff6873
LC		 2910 return ret;
2911}
2912
2913/*
2914 * Remove lr_request from the list_request and free the
4ed5c033 2915 * request structure. Should be called with li_list_mtx held
bfff6873
LC		 2916 */
2917static void ext4_remove_li_request(struct ext4_li_request *elr)
2918{
2919 struct ext4_sb_info *sbi;
2920
2921 if (!elr)
2922 return;
2923
2924 sbi = elr->lr_sbi;
2925
2926 list_del(&elr->lr_request);
2927 sbi->s_li_request = NULL;
2928 kfree(elr);
2929}
2930
2931static void ext4_unregister_li_request(struct super_block *sb)
2932{
1bb933fb
LC		 2933 mutex_lock(&ext4_li_mtx);
2934 if (!ext4_li_info) {
2935 mutex_unlock(&ext4_li_mtx);
bfff6873 2936 return;
1bb933fb 2937 }
bfff6873
LC		 2938
2939 mutex_lock(&ext4_li_info->li_list_mtx);
1bb933fb 2940 ext4_remove_li_request(EXT4_SB(sb)->s_li_request);
bfff6873 2941 mutex_unlock(&ext4_li_info->li_list_mtx);
1bb933fb 2942 mutex_unlock(&ext4_li_mtx);
bfff6873
LC		 2943}
2944
8f1f7453
ES		 2945static struct task_struct *ext4_lazyinit_task;
2946
bfff6873
LC		 2947/*
2948 * This is the function where ext4lazyinit thread lives. It walks
2949 * through the request list searching for next scheduled filesystem.
2950 * When such a fs is found, run the lazy initialization request
2951 * (ext4_rn_li_request) and keep track of the time spend in this
2952 * function. Based on that time we compute next schedule time of
2953 * the request. When walking through the list is complete, compute
2954 * next waking time and put itself into sleep.
2955 */
2956static int ext4_lazyinit_thread(void *arg)
2957{
2958 struct ext4_lazy_init *eli = (struct ext4_lazy_init *)arg;
2959 struct list_head *pos, *n;
2960 struct ext4_li_request *elr;
4ed5c033 2961 unsigned long next_wakeup, cur;
bfff6873
LC		 2962
2963 BUG_ON(NULL == eli);
2964
bfff6873
LC		 2965cont_thread:
2966 while (true) {
2967 next_wakeup = MAX_JIFFY_OFFSET;
2968
2969 mutex_lock(&eli->li_list_mtx);
2970 if (list_empty(&eli->li_request_list)) {
2971 mutex_unlock(&eli->li_list_mtx);
2972 goto exit_thread;
2973 }
bfff6873 2974 list_for_each_safe(pos, n, &eli->li_request_list) {
e22834f0
DM		 2975 int err = 0;
2976 int progress = 0;
bfff6873
LC		 2977 elr = list_entry(pos, struct ext4_li_request,
2978 lr_request);
2979
e22834f0
DM		 2980 if (time_before(jiffies, elr->lr_next_sched)) {
2981 if (time_before(elr->lr_next_sched, next_wakeup))
2982 next_wakeup = elr->lr_next_sched;
2983 continue;
2984 }
2985 if (down_read_trylock(&elr->lr_super->s_umount)) {
2986 if (sb_start_write_trylock(elr->lr_super)) {
2987 progress = 1;
2988 /*
2989 * We hold sb->s_umount, sb can not
2990 * be removed from the list, it is
2991 * now safe to drop li_list_mtx
2992 */
2993 mutex_unlock(&eli->li_list_mtx);
2994 err = ext4_run_li_request(elr);
2995 sb_end_write(elr->lr_super);
2996 mutex_lock(&eli->li_list_mtx);
2997 n = pos->next;
b2c78cd0 2998 }
e22834f0
DM		 2999 up_read((&elr->lr_super->s_umount));
3000 }
3001 /* error, remove the lazy_init job */
3002 if (err) {
3003 ext4_remove_li_request(elr);
3004 continue;
3005 }
3006 if (!progress) {
3007 elr->lr_next_sched = jiffies +
3008 (prandom_u32()
3009 % (EXT4_DEF_LI_MAX_START_DELAY * HZ));
bfff6873 3010 }
bfff6873
LC		 3011 if (time_before(elr->lr_next_sched, next_wakeup))
3012 next_wakeup = elr->lr_next_sched;
3013 }
3014 mutex_unlock(&eli->li_list_mtx);
3015
a0acae0e 3016 try_to_freeze();
bfff6873 3017
4ed5c033
LC		 3018 cur = jiffies;
3019 if ((time_after_eq(cur, next_wakeup)) ||
f4245bd4 3020 (MAX_JIFFY_OFFSET == next_wakeup)) {
bfff6873
LC		 3021 cond_resched();
3022 continue;
3023 }
3024
4ed5c033
LC		 3025 schedule_timeout_interruptible(next_wakeup - cur);
3026
8f1f7453
ES		 3027 if (kthread_should_stop()) {
3028 ext4_clear_request_list();
3029 goto exit_thread;
3030 }
bfff6873
LC		 3031 }
3032
3033exit_thread:
3034 /*
3035 * It looks like the request list is empty, but we need
3036 * to check it under the li_list_mtx lock, to prevent any
3037 * additions into it, and of course we should lock ext4_li_mtx
3038 * to atomically free the list and ext4_li_info, because at
3039 * this point another ext4 filesystem could be registering
3040 * new one.
3041 */
3042 mutex_lock(&ext4_li_mtx);
3043 mutex_lock(&eli->li_list_mtx);
3044 if (!list_empty(&eli->li_request_list)) {
3045 mutex_unlock(&eli->li_list_mtx);
3046 mutex_unlock(&ext4_li_mtx);
3047 goto cont_thread;
3048 }
3049 mutex_unlock(&eli->li_list_mtx);
bfff6873
LC		 3050 kfree(ext4_li_info);
3051 ext4_li_info = NULL;
3052 mutex_unlock(&ext4_li_mtx);
3053
3054 return 0;
3055}
3056
3057static void ext4_clear_request_list(void)
3058{
3059 struct list_head *pos, *n;
3060 struct ext4_li_request *elr;
3061
3062 mutex_lock(&ext4_li_info->li_list_mtx);
bfff6873
LC		 3063 list_for_each_safe(pos, n, &ext4_li_info->li_request_list) {
3064 elr = list_entry(pos, struct ext4_li_request,
3065 lr_request);
3066 ext4_remove_li_request(elr);
3067 }
3068 mutex_unlock(&ext4_li_info->li_list_mtx);
3069}
3070
3071static int ext4_run_lazyinit_thread(void)
3072{
8f1f7453
ES		 3073 ext4_lazyinit_task = kthread_run(ext4_lazyinit_thread,
3074 ext4_li_info, "ext4lazyinit");
3075 if (IS_ERR(ext4_lazyinit_task)) {
3076 int err = PTR_ERR(ext4_lazyinit_task);
bfff6873 3077 ext4_clear_request_list();
bfff6873
LC		 3078 kfree(ext4_li_info);
3079 ext4_li_info = NULL;
92b97816 3080 printk(KERN_CRIT "EXT4-fs: error %d creating inode table "
bfff6873
LC		 3081 "initialization thread\n",
3082 err);
3083 return err;
3084 }
3085 ext4_li_info->li_state |= EXT4_LAZYINIT_RUNNING;
bfff6873
LC		 3086 return 0;
3087}
3088
3089/*
3090 * Check whether it make sense to run itable init. thread or not.
3091 * If there is at least one uninitialized inode table, return
3092 * corresponding group number, else the loop goes through all
3093 * groups and return total number of groups.
3094 */
3095static ext4_group_t ext4_has_uninit_itable(struct super_block *sb)
3096{
3097 ext4_group_t group, ngroups = EXT4_SB(sb)->s_groups_count;
3098 struct ext4_group_desc *gdp = NULL;
3099
3100 for (group = 0; group < ngroups; group++) {
3101 gdp = ext4_get_group_desc(sb, group, NULL);
3102 if (!gdp)
3103 continue;
3104
3105 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
3106 break;
3107 }
3108
3109 return group;
3110}
3111
3112static int ext4_li_info_new(void)
3113{
3114 struct ext4_lazy_init *eli = NULL;
3115
3116 eli = kzalloc(sizeof(*eli), GFP_KERNEL);
3117 if (!eli)
3118 return -ENOMEM;
3119
bfff6873
LC		 3120 INIT_LIST_HEAD(&eli->li_request_list);
3121 mutex_init(&eli->li_list_mtx);
3122
bfff6873
LC		 3123 eli->li_state |= EXT4_LAZYINIT_QUIT;
3124
3125 ext4_li_info = eli;
3126
3127 return 0;
3128}
3129
3130static struct ext4_li_request *ext4_li_request_new(struct super_block *sb,
3131 ext4_group_t start)
3132{
3133 struct ext4_sb_info *sbi = EXT4_SB(sb);
3134 struct ext4_li_request *elr;
bfff6873
LC		 3135
3136 elr = kzalloc(sizeof(*elr), GFP_KERNEL);
3137 if (!elr)
3138 return NULL;
3139
3140 elr->lr_super = sb;
3141 elr->lr_sbi = sbi;
3142 elr->lr_next_group = start;
3143
3144 /*
3145 * Randomize first schedule time of the request to
3146 * spread the inode table initialization requests
3147 * better.
3148 */
dd1f723b
TT		 3149 elr->lr_next_sched = jiffies + (prandom_u32() %
3150 (EXT4_DEF_LI_MAX_START_DELAY * HZ));
bfff6873
LC		 3151 return elr;
3152}
3153
7f511862
TT		 3154int ext4_register_li_request(struct super_block *sb,
3155 ext4_group_t first_not_zeroed)
bfff6873
LC		 3156{
3157 struct ext4_sb_info *sbi = EXT4_SB(sb);
7f511862 3158 struct ext4_li_request *elr = NULL;
49598e04 3159 ext4_group_t ngroups = sbi->s_groups_count;
6c5a6cb9 3160 int ret = 0;
bfff6873 3161
7f511862 3162 mutex_lock(&ext4_li_mtx);
51ce6511
LC		 3163 if (sbi->s_li_request != NULL) {
3164 /*
3165 * Reset timeout so it can be computed again, because
3166 * s_li_wait_mult might have changed.
3167 */
3168 sbi->s_li_request->lr_timeout = 0;
7f511862 3169 goto out;
51ce6511 3170 }
bfff6873 3171
bc98a42c 3172 if (first_not_zeroed == ngroups || sb_rdonly(sb) ||
55ff3840 3173 !test_opt(sb, INIT_INODE_TABLE))
7f511862 3174 goto out;
bfff6873
LC		 3175
3176 elr = ext4_li_request_new(sb, first_not_zeroed);
7f511862
TT		 3177 if (!elr) {
3178 ret = -ENOMEM;
3179 goto out;
3180 }
bfff6873
LC		 3181
3182 if (NULL == ext4_li_info) {
3183 ret = ext4_li_info_new();
3184 if (ret)
3185 goto out;
3186 }
3187
3188 mutex_lock(&ext4_li_info->li_list_mtx);
3189 list_add(&elr->lr_request, &ext4_li_info->li_request_list);
3190 mutex_unlock(&ext4_li_info->li_list_mtx);
3191
3192 sbi->s_li_request = elr;
46e4690b
TM		 3193 /*
3194 * set elr to NULL here since it has been inserted to
3195 * the request_list and the removal and free of it is
3196 * handled by ext4_clear_request_list from now on.
3197 */
3198 elr = NULL;
bfff6873
LC		 3199
3200 if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) {
3201 ret = ext4_run_lazyinit_thread();
3202 if (ret)
3203 goto out;
3204 }
bfff6873 3205out:
beed5ecb
NK		 3206 mutex_unlock(&ext4_li_mtx);
3207 if (ret)
bfff6873 3208 kfree(elr);
bfff6873
LC		 3209 return ret;
3210}
3211
3212/*
3213 * We do not need to lock anything since this is called on
3214 * module unload.
3215 */
3216static void ext4_destroy_lazyinit_thread(void)
3217{
3218 /*
3219 * If thread exited earlier
3220 * there's nothing to be done.
3221 */
8f1f7453 3222 if (!ext4_li_info || !ext4_lazyinit_task)
bfff6873
LC		 3223 return;
3224
8f1f7453 3225 kthread_stop(ext4_lazyinit_task);
bfff6873
LC		 3226}
3227
25ed6e8a
DW		 3228static int set_journal_csum_feature_set(struct super_block *sb)
3229{
3230 int ret = 1;
3231 int compat, incompat;
3232 struct ext4_sb_info *sbi = EXT4_SB(sb);
3233
9aa5d32b 3234 if (ext4_has_metadata_csum(sb)) {
db9ee220 3235 /* journal checksum v3 */
25ed6e8a 3236 compat = 0;
db9ee220 3237 incompat = JBD2_FEATURE_INCOMPAT_CSUM_V3;
25ed6e8a
DW		 3238 } else {
3239 /* journal checksum v1 */
3240 compat = JBD2_FEATURE_COMPAT_CHECKSUM;
3241 incompat = 0;
3242 }
3243
feb8c6d3
DW		 3244 jbd2_journal_clear_features(sbi->s_journal,
3245 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
3246 JBD2_FEATURE_INCOMPAT_CSUM_V3 |
3247 JBD2_FEATURE_INCOMPAT_CSUM_V2);
25ed6e8a
DW		 3248 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
3249 ret = jbd2_journal_set_features(sbi->s_journal,
3250 compat, 0,
3251 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT |
3252 incompat);
3253 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
3254 ret = jbd2_journal_set_features(sbi->s_journal,
3255 compat, 0,
3256 incompat);
3257 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
3258 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
3259 } else {
feb8c6d3
DW		 3260 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
3261 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
25ed6e8a
DW		 3262 }
3263
3264 return ret;
3265}
3266
952fc18e
TT		 3267/*
3268 * Note: calculating the overhead so we can be compatible with
3269 * historical BSD practice is quite difficult in the face of
3270 * clusters/bigalloc. This is because multiple metadata blocks from
3271 * different block group can end up in the same allocation cluster.
3272 * Calculating the exact overhead in the face of clustered allocation
3273 * requires either O(all block bitmaps) in memory or O(number of block
3274 * groups**2) in time. We will still calculate the superblock for
3275 * older file systems --- and if we come across with a bigalloc file
3276 * system with zero in s_overhead_clusters the estimate will be close to
3277 * correct especially for very large cluster sizes --- but for newer
3278 * file systems, it's better to calculate this figure once at mkfs
3279 * time, and store it in the superblock. If the superblock value is
3280 * present (even for non-bigalloc file systems), we will use it.
3281 */
3282static int count_overhead(struct super_block *sb, ext4_group_t grp,
3283 char *buf)
3284{
3285 struct ext4_sb_info *sbi = EXT4_SB(sb);
3286 struct ext4_group_desc *gdp;
3287 ext4_fsblk_t first_block, last_block, b;
3288 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3289 int s, j, count = 0;
3290
e2b911c5 3291 if (!ext4_has_feature_bigalloc(sb))
0548bbb8
TT		 3292 return (ext4_bg_has_super(sb, grp) + ext4_bg_num_gdb(sb, grp) +
3293 sbi->s_itb_per_group + 2);
3294
952fc18e
TT		 3295 first_block = le32_to_cpu(sbi->s_es->s_first_data_block) +
3296 (grp * EXT4_BLOCKS_PER_GROUP(sb));
3297 last_block = first_block + EXT4_BLOCKS_PER_GROUP(sb) - 1;
3298 for (i = 0; i < ngroups; i++) {
3299 gdp = ext4_get_group_desc(sb, i, NULL);
3300 b = ext4_block_bitmap(sb, gdp);
3301 if (b >= first_block && b <= last_block) {
3302 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3303 count++;
3304 }
3305 b = ext4_inode_bitmap(sb, gdp);
3306 if (b >= first_block && b <= last_block) {
3307 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3308 count++;
3309 }
3310 b = ext4_inode_table(sb, gdp);
3311 if (b >= first_block && b + sbi->s_itb_per_group <= last_block)
3312 for (j = 0; j < sbi->s_itb_per_group; j++, b++) {
3313 int c = EXT4_B2C(sbi, b - first_block);
3314 ext4_set_bit(c, buf);
3315 count++;
3316 }
3317 if (i != grp)
3318 continue;
3319 s = 0;
3320 if (ext4_bg_has_super(sb, grp)) {
3321 ext4_set_bit(s++, buf);
3322 count++;
3323 }
c48ae41b
TT		 3324 j = ext4_bg_num_gdb(sb, grp);
3325 if (s + j > EXT4_BLOCKS_PER_GROUP(sb)) {
3326 ext4_error(sb, "Invalid number of block group "
3327 "descriptor blocks: %d", j);
3328 j = EXT4_BLOCKS_PER_GROUP(sb) - s;
952fc18e 3329 }
c48ae41b
TT		 3330 count += j;
3331 for (; j > 0; j--)
3332 ext4_set_bit(EXT4_B2C(sbi, s++), buf);
952fc18e
TT		 3333 }
3334 if (!count)
3335 return 0;
3336 return EXT4_CLUSTERS_PER_GROUP(sb) -
3337 ext4_count_free(buf, EXT4_CLUSTERS_PER_GROUP(sb) / 8);
3338}
3339
3340/*
3341 * Compute the overhead and stash it in sbi->s_overhead
3342 */
3343int ext4_calculate_overhead(struct super_block *sb)
3344{
3345 struct ext4_sb_info *sbi = EXT4_SB(sb);
3346 struct ext4_super_block *es = sbi->s_es;
3c816ded
EW		 3347 struct inode *j_inode;
3348 unsigned int j_blocks, j_inum = le32_to_cpu(es->s_journal_inum);
952fc18e
TT		 3349 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3350 ext4_fsblk_t overhead = 0;
4fdb5543 3351 char *buf = (char *) get_zeroed_page(GFP_NOFS);
952fc18e 3352
952fc18e
TT		 3353 if (!buf)
3354 return -ENOMEM;
3355
3356 /*
3357 * Compute the overhead (FS structures). This is constant
3358 * for a given filesystem unless the number of block groups
3359 * changes so we cache the previous value until it does.
3360 */
3361
3362 /*
3363 * All of the blocks before first_data_block are overhead
3364 */
3365 overhead = EXT4_B2C(sbi, le32_to_cpu(es->s_first_data_block));
3366
3367 /*
3368 * Add the overhead found in each block group
3369 */
3370 for (i = 0; i < ngroups; i++) {
3371 int blks;
3372
3373 blks = count_overhead(sb, i, buf);
3374 overhead += blks;
3375 if (blks)
3376 memset(buf, 0, PAGE_SIZE);
3377 cond_resched();
3378 }
3c816ded
EW		 3379
3380 /*
3381 * Add the internal journal blocks whether the journal has been
3382 * loaded or not
3383 */
b003b524 3384 if (sbi->s_journal && !sbi->journal_bdev)
810da240 3385 overhead += EXT4_NUM_B2C(sbi, sbi->s_journal->j_maxlen);
3c816ded
EW		 3386 else if (ext4_has_feature_journal(sb) && !sbi->s_journal) {
3387 j_inode = ext4_get_journal_inode(sb, j_inum);
3388 if (j_inode) {
3389 j_blocks = j_inode->i_size >> sb->s_blocksize_bits;
3390 overhead += EXT4_NUM_B2C(sbi, j_blocks);
3391 iput(j_inode);
3392 } else {
3393 ext4_msg(sb, KERN_ERR, "can't get journal size");
3394 }
3395 }
952fc18e
TT		 3396 sbi->s_overhead = overhead;
3397 smp_wmb();
3398 free_page((unsigned long) buf);
3399 return 0;
3400}
3401
b5799018 3402static void ext4_set_resv_clusters(struct super_block *sb)
27dd4385
LC		 3403{
3404 ext4_fsblk_t resv_clusters;
b5799018 3405 struct ext4_sb_info *sbi = EXT4_SB(sb);
27dd4385 3406
30fac0f7
JK		 3407 /*
3408 * There's no need to reserve anything when we aren't using extents.
3409 * The space estimates are exact, there are no unwritten extents,
3410 * hole punching doesn't need new metadata... This is needed especially
3411 * to keep ext2/3 backward compatibility.
3412 */
e2b911c5 3413 if (!ext4_has_feature_extents(sb))
b5799018 3414 return;
27dd4385
LC		 3415 /*
3416 * By default we reserve 2% or 4096 clusters, whichever is smaller.
3417 * This should cover the situations where we can not afford to run
3418 * out of space like for example punch hole, or converting
556615dc 3419 * unwritten extents in delalloc path. In most cases such
27dd4385
LC		 3420 * allocation would require 1, or 2 blocks, higher numbers are
3421 * very rare.
3422 */
b5799018
TT		 3423 resv_clusters = (ext4_blocks_count(sbi->s_es) >>
3424 sbi->s_cluster_bits);
27dd4385
LC		 3425
3426 do_div(resv_clusters, 50);
3427 resv_clusters = min_t(ext4_fsblk_t, resv_clusters, 4096);
3428
b5799018 3429 atomic64_set(&sbi->s_resv_clusters, resv_clusters);
27dd4385
LC		 3430}
3431
2b2d6d01 3432static int ext4_fill_super(struct super_block *sb, void *data, int silent)
ac27a0ec 3433{
5e405595 3434 struct dax_device *dax_dev = fs_dax_get_by_bdev(sb->s_bdev);
d4c402d9 3435 char *orig_data = kstrdup(data, GFP_KERNEL);
2b2d6d01 3436 struct buffer_head *bh;
617ba13b 3437 struct ext4_super_block *es = NULL;
5aee0f8a 3438 struct ext4_sb_info *sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
617ba13b
MC		 3439 ext4_fsblk_t block;
3440 ext4_fsblk_t sb_block = get_sb_block(&data);
70bbb3e0 3441 ext4_fsblk_t logical_sb_block;
ac27a0ec 3442 unsigned long offset = 0;
ac27a0ec
DK		 3443 unsigned long journal_devnum = 0;
3444 unsigned long def_mount_opts;
3445 struct inode *root;
0390131b 3446 const char *descr;
dcc7dae3 3447 int ret = -ENOMEM;
281b5995 3448 int blocksize, clustersize;
4ec11028
TT		 3449 unsigned int db_count;
3450 unsigned int i;
281b5995 3451 int needs_recovery, has_huge_files, has_bigalloc;
bd81d8ee 3452 __u64 blocks_count;
07aa2ea1 3453 int err = 0;
b3881f74 3454 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
bfff6873 3455 ext4_group_t first_not_zeroed;
ac27a0ec 3456
5aee0f8a
TT		 3457 if ((data && !orig_data) || !sbi)
3458 goto out_free_base;
705895b6 3459
aed9eb1b 3460 sbi->s_daxdev = dax_dev;
705895b6
PE		 3461 sbi->s_blockgroup_lock =
3462 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
5aee0f8a
TT		 3463 if (!sbi->s_blockgroup_lock)
3464 goto out_free_base;
3465
ac27a0ec 3466 sb->s_fs_info = sbi;
2c0544b2 3467 sbi->s_sb = sb;
240799cd 3468 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
d9c9bef1 3469 sbi->s_sb_block = sb_block;
f613dfcb
TT		 3470 if (sb->s_bdev->bd_part)
3471 sbi->s_sectors_written_start =
3472 part_stat_read(sb->s_bdev->bd_part, sectors[1]);
ac27a0ec 3473
9f6200bb 3474 /* Cleanup superblock name */
ec3904dc 3475 strreplace(sb->s_id, '/', '!');
9f6200bb 3476
07aa2ea1 3477 /* -EINVAL is default */
dcc7dae3 3478 ret = -EINVAL;
617ba13b 3479 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
ac27a0ec 3480 if (!blocksize) {
b31e1552 3481 ext4_msg(sb, KERN_ERR, "unable to set blocksize");
ac27a0ec
DK		 3482 goto out_fail;
3483 }
3484
3485 /*
617ba13b 3486 * The ext4 superblock will not be buffer aligned for other than 1kB
ac27a0ec
DK		 3487 * block sizes. We need to calculate the offset from buffer start.
3488 */
617ba13b 3489 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
70bbb3e0
AM		 3490 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3491 offset = do_div(logical_sb_block, blocksize);
ac27a0ec 3492 } else {
70bbb3e0 3493 logical_sb_block = sb_block;
ac27a0ec
DK		 3494 }
3495
a8ac900b 3496 if (!(bh = sb_bread_unmovable(sb, logical_sb_block))) {
b31e1552 3497 ext4_msg(sb, KERN_ERR, "unable to read superblock");
ac27a0ec
DK		 3498 goto out_fail;
3499 }
3500 /*
3501 * Note: s_es must be initialized as soon as possible because
617ba13b 3502 * some ext4 macro-instructions depend on its value
ac27a0ec 3503 */
2716b802 3504 es = (struct ext4_super_block *) (bh->b_data + offset);
ac27a0ec
DK		 3505 sbi->s_es = es;
3506 sb->s_magic = le16_to_cpu(es->s_magic);
617ba13b
MC		 3507 if (sb->s_magic != EXT4_SUPER_MAGIC)
3508 goto cantfind_ext4;
afc32f7e 3509 sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
ac27a0ec 3510
feb0ab32 3511 /* Warn if metadata_csum and gdt_csum are both set. */
e2b911c5
DW		 3512 if (ext4_has_feature_metadata_csum(sb) &&
3513 ext4_has_feature_gdt_csum(sb))
363307e6 3514 ext4_warning(sb, "metadata_csum and uninit_bg are "
feb0ab32
DW		 3515 "redundant flags; please run fsck.");
3516
d25425f8
DW		 3517 /* Check for a known checksum algorithm */
3518 if (!ext4_verify_csum_type(sb, es)) {
3519 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3520 "unknown checksum algorithm.");
3521 silent = 1;
3522 goto cantfind_ext4;
3523 }
3524
0441984a 3525 /* Load the checksum driver */
a45403b5
TT		 3526 sbi->s_chksum_driver = crypto_alloc_shash("crc32c", 0, 0);
3527 if (IS_ERR(sbi->s_chksum_driver)) {
3528 ext4_msg(sb, KERN_ERR, "Cannot load crc32c driver.");
3529 ret = PTR_ERR(sbi->s_chksum_driver);
3530 sbi->s_chksum_driver = NULL;
3531 goto failed_mount;
0441984a
DW		 3532 }
3533
a9c47317
DW		 3534 /* Check superblock checksum */
3535 if (!ext4_superblock_csum_verify(sb, es)) {
3536 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3537 "invalid superblock checksum. Run e2fsck?");
3538 silent = 1;
6a797d27 3539 ret = -EFSBADCRC;
a9c47317
DW		 3540 goto cantfind_ext4;
3541 }
3542
3543 /* Precompute checksum seed for all metadata */
e2b911c5 3544 if (ext4_has_feature_csum_seed(sb))
8c81bd8f 3545 sbi->s_csum_seed = le32_to_cpu(es->s_checksum_seed);
dec214d0 3546 else if (ext4_has_metadata_csum(sb) || ext4_has_feature_ea_inode(sb))
a9c47317
DW		 3547 sbi->s_csum_seed = ext4_chksum(sbi, ~0, es->s_uuid,
3548 sizeof(es->s_uuid));
3549
ac27a0ec
DK		 3550 /* Set defaults before we parse the mount options */
3551 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
fd8c37ec 3552 set_opt(sb, INIT_INODE_TABLE);
617ba13b 3553 if (def_mount_opts & EXT4_DEFM_DEBUG)
fd8c37ec 3554 set_opt(sb, DEBUG);
87f26807 3555 if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
fd8c37ec 3556 set_opt(sb, GRPID);
617ba13b 3557 if (def_mount_opts & EXT4_DEFM_UID16)
fd8c37ec 3558 set_opt(sb, NO_UID32);
ea663336 3559 /* xattr user namespace & acls are now defaulted on */
ea663336 3560 set_opt(sb, XATTR_USER);
03010a33 3561#ifdef CONFIG_EXT4_FS_POSIX_ACL
ea663336 3562 set_opt(sb, POSIX_ACL);
2e7842b8 3563#endif
98c1a759
DW		 3564 /* don't forget to enable journal_csum when metadata_csum is enabled. */
3565 if (ext4_has_metadata_csum(sb))
3566 set_opt(sb, JOURNAL_CHECKSUM);
3567
617ba13b 3568 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
fd8c37ec 3569 set_opt(sb, JOURNAL_DATA);
617ba13b 3570 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
fd8c37ec 3571 set_opt(sb, ORDERED_DATA);
617ba13b 3572 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
fd8c37ec 3573 set_opt(sb, WRITEBACK_DATA);
617ba13b
MC		 3574
3575 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
fd8c37ec 3576 set_opt(sb, ERRORS_PANIC);
bb4f397a 3577 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
fd8c37ec 3578 set_opt(sb, ERRORS_CONT);
bb4f397a 3579 else
fd8c37ec 3580 set_opt(sb, ERRORS_RO);
45f1a9c3
DW		 3581 /* block_validity enabled by default; disable with noblock_validity */
3582 set_opt(sb, BLOCK_VALIDITY);
8b67f04a 3583 if (def_mount_opts & EXT4_DEFM_DISCARD)
fd8c37ec 3584 set_opt(sb, DISCARD);
ac27a0ec 3585
08cefc7a
EB		 3586 sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));
3587 sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid));
30773840
TT		 3588 sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
3589 sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
3590 sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
ac27a0ec 3591
8b67f04a 3592 if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0)
fd8c37ec 3593 set_opt(sb, BARRIER);
ac27a0ec 3594
dd919b98
AK		 3595 /*
3596 * enable delayed allocation by default
3597 * Use -o nodelalloc to turn it off
3598 */
bc0b75f7 3599 if (!IS_EXT3_SB(sb) && !IS_EXT2_SB(sb) &&
8b67f04a 3600 ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0))
fd8c37ec 3601 set_opt(sb, DELALLOC);
dd919b98 3602
51ce6511
LC		 3603 /*
3604 * set default s_li_wait_mult for lazyinit, for the case there is
3605 * no mount option specified.
3606 */
3607 sbi->s_li_wait_mult = EXT4_DEF_LI_WAIT_MULT;
3608
5aee0f8a
TT		 3609 if (sbi->s_es->s_mount_opts[0]) {
3610 char *s_mount_opts = kstrndup(sbi->s_es->s_mount_opts,
3611 sizeof(sbi->s_es->s_mount_opts),
3612 GFP_KERNEL);
3613 if (!s_mount_opts)
3614 goto failed_mount;
3615 if (!parse_options(s_mount_opts, sb, &journal_devnum,
3616 &journal_ioprio, 0)) {
3617 ext4_msg(sb, KERN_WARNING,
3618 "failed to parse options in superblock: %s",
3619 s_mount_opts);
3620 }
3621 kfree(s_mount_opts);
8b67f04a 3622 }
5a916be1 3623 sbi->s_def_mount_opt = sbi->s_mount_opt;
b3881f74 3624 if (!parse_options((char *) data, sb, &journal_devnum,
661aa520 3625 &journal_ioprio, 0))
ac27a0ec
DK		 3626 goto failed_mount;
3627
56889787
TT		 3628 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
3629 printk_once(KERN_WARNING "EXT4-fs: Warning: mounting "
3630 "with data=journal disables delayed "
3631 "allocation and O_DIRECT support!\n");
3632 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
3633 ext4_msg(sb, KERN_ERR, "can't mount with "
3634 "both data=journal and delalloc");
3635 goto failed_mount;
3636 }
3637 if (test_opt(sb, DIOREAD_NOLOCK)) {
3638 ext4_msg(sb, KERN_ERR, "can't mount with "
6ae6514b 3639 "both data=journal and dioread_nolock");
56889787
TT		 3640 goto failed_mount;
3641 }
923ae0ff
RZ		 3642 if (test_opt(sb, DAX)) {
3643 ext4_msg(sb, KERN_ERR, "can't mount with "
3644 "both data=journal and dax");
3645 goto failed_mount;
3646 }
73b92a2a
SK		 3647 if (ext4_has_feature_encrypt(sb)) {
3648 ext4_msg(sb, KERN_WARNING,
3649 "encrypted files will use data=ordered "
3650 "instead of data journaling mode");
3651 }
56889787
TT		 3652 if (test_opt(sb, DELALLOC))
3653 clear_opt(sb, DELALLOC);
001e4a87
TH		 3654 } else {
3655 sb->s_iflags |= SB_I_CGROUPWB;
56889787
TT		 3656 }
3657
1751e8a6
LT		 3658 sb->s_flags = (sb->s_flags & ~SB_POSIXACL) |
3659 (test_opt(sb, POSIX_ACL) ? SB_POSIXACL : 0);
ac27a0ec 3660
617ba13b 3661 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
e2b911c5
DW		 3662 (ext4_has_compat_features(sb) ||
3663 ext4_has_ro_compat_features(sb) ||
3664 ext4_has_incompat_features(sb)))
b31e1552
ES		 3665 ext4_msg(sb, KERN_WARNING,
3666 "feature flags set on rev 0 fs, "
3667 "running e2fsck is recommended");
469108ff 3668
ed3654eb
TT		 3669 if (es->s_creator_os == cpu_to_le32(EXT4_OS_HURD)) {
3670 set_opt2(sb, HURD_COMPAT);
e2b911c5 3671 if (ext4_has_feature_64bit(sb)) {
ed3654eb
TT		 3672 ext4_msg(sb, KERN_ERR,
3673 "The Hurd can't support 64-bit file systems");
3674 goto failed_mount;
3675 }
dec214d0
TE		 3676
3677 /*
3678 * ea_inode feature uses l_i_version field which is not
3679 * available in HURD_COMPAT mode.
3680 */
3681 if (ext4_has_feature_ea_inode(sb)) {
3682 ext4_msg(sb, KERN_ERR,
3683 "ea_inode feature is not supported for Hurd");
3684 goto failed_mount;
3685 }
ed3654eb
TT		 3686 }
3687
2035e776
TT		 3688 if (IS_EXT2_SB(sb)) {
3689 if (ext2_feature_set_ok(sb))
3690 ext4_msg(sb, KERN_INFO, "mounting ext2 file system "
3691 "using the ext4 subsystem");
3692 else {
0d9366d6
ES		 3693 /*
3694 * If we're probing be silent, if this looks like
3695 * it's actually an ext[34] filesystem.
3696 */
3697 if (silent && ext4_feature_set_ok(sb, sb_rdonly(sb)))
3698 goto failed_mount;
2035e776
TT		 3699 ext4_msg(sb, KERN_ERR, "couldn't mount as ext2 due "
3700 "to feature incompatibilities");
3701 goto failed_mount;
3702 }
3703 }
3704
3705 if (IS_EXT3_SB(sb)) {
3706 if (ext3_feature_set_ok(sb))
3707 ext4_msg(sb, KERN_INFO, "mounting ext3 file system "
3708 "using the ext4 subsystem");
3709 else {
0d9366d6
ES		 3710 /*
3711 * If we're probing be silent, if this looks like
3712 * it's actually an ext4 filesystem.
3713 */
3714 if (silent && ext4_feature_set_ok(sb, sb_rdonly(sb)))
3715 goto failed_mount;
2035e776
TT		 3716 ext4_msg(sb, KERN_ERR, "couldn't mount as ext3 due "
3717 "to feature incompatibilities");
3718 goto failed_mount;
3719 }
3720 }
3721
ac27a0ec
DK		 3722 /*
3723 * Check feature flags regardless of the revision level, since we
3724 * previously didn't change the revision level when setting the flags,
3725 * so there is a chance incompat flags are set on a rev 0 filesystem.
3726 */
bc98a42c 3727 if (!ext4_feature_set_ok(sb, (sb_rdonly(sb))))
ac27a0ec 3728 goto failed_mount;
a13fb1a4 3729
261cb20c 3730 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
617ba13b
MC		 3731 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
3732 blocksize > EXT4_MAX_BLOCK_SIZE) {
b31e1552 3733 ext4_msg(sb, KERN_ERR,
8cdf3372
TT		 3734 "Unsupported filesystem blocksize %d (%d log_block_size)",
3735 blocksize, le32_to_cpu(es->s_log_block_size));
3736 goto failed_mount;
3737 }
3738 if (le32_to_cpu(es->s_log_block_size) >
3739 (EXT4_MAX_BLOCK_LOG_SIZE - EXT4_MIN_BLOCK_LOG_SIZE)) {
3740 ext4_msg(sb, KERN_ERR,
3741 "Invalid log block size: %u",
3742 le32_to_cpu(es->s_log_block_size));
ac27a0ec
DK		 3743 goto failed_mount;
3744 }
3745
5b9554dc
TT		 3746 if (le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) > (blocksize / 4)) {
3747 ext4_msg(sb, KERN_ERR,
3748 "Number of reserved GDT blocks insanely large: %d",
3749 le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks));
3750 goto failed_mount;
3751 }
3752
923ae0ff 3753 if (sbi->s_mount_opt & EXT4_MOUNT_DAX) {
559db4c6
RZ		 3754 if (ext4_has_feature_inline_data(sb)) {
3755 ext4_msg(sb, KERN_ERR, "Cannot use DAX on a filesystem"
3756 " that may contain inline data");
24f3478d 3757 sbi->s_mount_opt &= ~EXT4_MOUNT_DAX;
559db4c6 3758 }
80660f20 3759 if (!bdev_dax_supported(sb->s_bdev, blocksize)) {
24f3478d
DW		 3760 ext4_msg(sb, KERN_ERR,
3761 "DAX unsupported by block device. Turning off DAX.");
3762 sbi->s_mount_opt &= ~EXT4_MOUNT_DAX;
3763 }
923ae0ff
RZ		 3764 }
3765
e2b911c5 3766 if (ext4_has_feature_encrypt(sb) && es->s_encryption_level) {
6ddb2447
TT		 3767 ext4_msg(sb, KERN_ERR, "Unsupported encryption level %d",
3768 es->s_encryption_level);
3769 goto failed_mount;
3770 }
3771
ac27a0ec 3772 if (sb->s_blocksize != blocksize) {
ce40733c
AK		 3773 /* Validate the filesystem blocksize */
3774 if (!sb_set_blocksize(sb, blocksize)) {
b31e1552 3775 ext4_msg(sb, KERN_ERR, "bad block size %d",
ce40733c 3776 blocksize);
ac27a0ec
DK		 3777 goto failed_mount;
3778 }
3779
2b2d6d01 3780 brelse(bh);
70bbb3e0
AM		 3781 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3782 offset = do_div(logical_sb_block, blocksize);
a8ac900b 3783 bh = sb_bread_unmovable(sb, logical_sb_block);
ac27a0ec 3784 if (!bh) {
b31e1552
ES		 3785 ext4_msg(sb, KERN_ERR,
3786 "Can't read superblock on 2nd try");
ac27a0ec
DK		 3787 goto failed_mount;
3788 }
2716b802 3789 es = (struct ext4_super_block *)(bh->b_data + offset);
ac27a0ec 3790 sbi->s_es = es;
617ba13b 3791 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
b31e1552
ES		 3792 ext4_msg(sb, KERN_ERR,
3793 "Magic mismatch, very weird!");
ac27a0ec
DK		 3794 goto failed_mount;
3795 }
3796 }
3797
e2b911c5 3798 has_huge_files = ext4_has_feature_huge_file(sb);
f287a1a5
TT		 3799 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
3800 has_huge_files);
3801 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
ac27a0ec 3802
617ba13b
MC		 3803 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
3804 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
3805 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
ac27a0ec
DK		 3806 } else {
3807 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
3808 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
617ba13b 3809 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
1330593e 3810 (!is_power_of_2(sbi->s_inode_size)) ||
ac27a0ec 3811 (sbi->s_inode_size > blocksize)) {
b31e1552
ES		 3812 ext4_msg(sb, KERN_ERR,
3813 "unsupported inode size: %d",
2b2d6d01 3814 sbi->s_inode_size);
ac27a0ec
DK		 3815 goto failed_mount;
3816 }
ef7f3835
KS		 3817 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
3818 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
ac27a0ec 3819 }
0b8e58a1 3820
0d1ee42f 3821 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
e2b911c5 3822 if (ext4_has_feature_64bit(sb)) {
8fadc143 3823 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
0d1ee42f 3824 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
d8ea6cf8 3825 !is_power_of_2(sbi->s_desc_size)) {
b31e1552
ES		 3826 ext4_msg(sb, KERN_ERR,
3827 "unsupported descriptor size %lu",
0d1ee42f
AR		 3828 sbi->s_desc_size);
3829 goto failed_mount;
3830 }
3831 } else
3832 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
0b8e58a1 3833
ac27a0ec 3834 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
ac27a0ec 3835 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
0b8e58a1 3836
617ba13b 3837 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
ac27a0ec 3838 if (sbi->s_inodes_per_block == 0)
617ba13b 3839 goto cantfind_ext4;
cd6bb35b
TT		 3840 if (sbi->s_inodes_per_group < sbi->s_inodes_per_block ||
3841 sbi->s_inodes_per_group > blocksize * 8) {
3842 ext4_msg(sb, KERN_ERR, "invalid inodes per group: %lu\n",
3843 sbi->s_blocks_per_group);
3844 goto failed_mount;
3845 }
ac27a0ec
DK		 3846 sbi->s_itb_per_group = sbi->s_inodes_per_group /
3847 sbi->s_inodes_per_block;
0d1ee42f 3848 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
ac27a0ec
DK		 3849 sbi->s_sbh = bh;
3850 sbi->s_mount_state = le16_to_cpu(es->s_state);
e57aa839
FW		 3851 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
3852 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
0b8e58a1 3853
2b2d6d01 3854 for (i = 0; i < 4; i++)
ac27a0ec
DK		 3855 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
3856 sbi->s_def_hash_version = es->s_def_hash_version;
e2b911c5 3857 if (ext4_has_feature_dir_index(sb)) {
23301410
TT		 3858 i = le32_to_cpu(es->s_flags);
3859 if (i & EXT2_FLAGS_UNSIGNED_HASH)
3860 sbi->s_hash_unsigned = 3;
3861 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
f99b2589 3862#ifdef __CHAR_UNSIGNED__
bc98a42c 3863 if (!sb_rdonly(sb))
23301410
TT		 3864 es->s_flags |=
3865 cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
3866 sbi->s_hash_unsigned = 3;
f99b2589 3867#else
bc98a42c 3868 if (!sb_rdonly(sb))
23301410
TT		 3869 es->s_flags |=
3870 cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
f99b2589 3871#endif
23301410 3872 }
f99b2589 3873 }
ac27a0ec 3874
281b5995
TT		 3875 /* Handle clustersize */
3876 clustersize = BLOCK_SIZE << le32_to_cpu(es->s_log_cluster_size);
e2b911c5 3877 has_bigalloc = ext4_has_feature_bigalloc(sb);
281b5995
TT		 3878 if (has_bigalloc) {
3879 if (clustersize < blocksize) {
3880 ext4_msg(sb, KERN_ERR,
3881 "cluster size (%d) smaller than "
3882 "block size (%d)", clustersize, blocksize);
3883 goto failed_mount;
3884 }
8cdf3372
TT		 3885 if (le32_to_cpu(es->s_log_cluster_size) >
3886 (EXT4_MAX_CLUSTER_LOG_SIZE - EXT4_MIN_BLOCK_LOG_SIZE)) {
3887 ext4_msg(sb, KERN_ERR,
3888 "Invalid log cluster size: %u",
3889 le32_to_cpu(es->s_log_cluster_size));
3890 goto failed_mount;
3891 }
281b5995
TT		 3892 sbi->s_cluster_bits = le32_to_cpu(es->s_log_cluster_size) -
3893 le32_to_cpu(es->s_log_block_size);
3894 sbi->s_clusters_per_group =
3895 le32_to_cpu(es->s_clusters_per_group);
3896 if (sbi->s_clusters_per_group > blocksize * 8) {
3897 ext4_msg(sb, KERN_ERR,
3898 "#clusters per group too big: %lu",
3899 sbi->s_clusters_per_group);
3900 goto failed_mount;
3901 }
3902 if (sbi->s_blocks_per_group !=
3903 (sbi->s_clusters_per_group * (clustersize / blocksize))) {
3904 ext4_msg(sb, KERN_ERR, "blocks per group (%lu) and "
3905 "clusters per group (%lu) inconsistent",
3906 sbi->s_blocks_per_group,
3907 sbi->s_clusters_per_group);
3908 goto failed_mount;
3909 }
3910 } else {
3911 if (clustersize != blocksize) {
3912 ext4_warning(sb, "fragment/cluster size (%d) != "
3913 "block size (%d)", clustersize,
3914 blocksize);
3915 clustersize = blocksize;
3916 }
3917 if (sbi->s_blocks_per_group > blocksize * 8) {
3918 ext4_msg(sb, KERN_ERR,
3919 "#blocks per group too big: %lu",
3920 sbi->s_blocks_per_group);
3921 goto failed_mount;
3922 }
3923 sbi->s_clusters_per_group = sbi->s_blocks_per_group;
3924 sbi->s_cluster_bits = 0;
ac27a0ec 3925 }
281b5995
TT		 3926 sbi->s_cluster_ratio = clustersize / blocksize;
3927
960fd856
TT		 3928 /* Do we have standard group size of clustersize * 8 blocks ? */
3929 if (sbi->s_blocks_per_group == clustersize << 3)
3930 set_opt2(sb, STD_GROUP_SIZE);
3931
bf43d84b
ES		 3932 /*
3933 * Test whether we have more sectors than will fit in sector_t,
3934 * and whether the max offset is addressable by the page cache.
3935 */
5a9ae68a 3936 err = generic_check_addressable(sb->s_blocksize_bits,
30ca22c7 3937 ext4_blocks_count(es));
5a9ae68a 3938 if (err) {
b31e1552 3939 ext4_msg(sb, KERN_ERR, "filesystem"
bf43d84b 3940 " too large to mount safely on this system");
ac27a0ec 3941 if (sizeof(sector_t) < 8)
90c699a9 3942 ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled");
ac27a0ec
DK		 3943 goto failed_mount;
3944 }
3945
617ba13b
MC		 3946 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
3947 goto cantfind_ext4;
e7c95593 3948
0f2ddca6
FTN		 3949 /* check blocks count against device size */
3950 blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
3951 if (blocks_count && ext4_blocks_count(es) > blocks_count) {
b31e1552
ES		 3952 ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
3953 "exceeds size of device (%llu blocks)",
0f2ddca6
FTN		 3954 ext4_blocks_count(es), blocks_count);
3955 goto failed_mount;
3956 }
3957
0b8e58a1
AD		 3958 /*
3959 * It makes no sense for the first data block to be beyond the end
3960 * of the filesystem.
3961 */
3962 if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
5635a62b 3963 ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
b31e1552
ES		 3964 "block %u is beyond end of filesystem (%llu)",
3965 le32_to_cpu(es->s_first_data_block),
3966 ext4_blocks_count(es));
e7c95593
ES		 3967 goto failed_mount;
3968 }
bd81d8ee
LV		 3969 blocks_count = (ext4_blocks_count(es) -
3970 le32_to_cpu(es->s_first_data_block) +
3971 EXT4_BLOCKS_PER_GROUP(sb) - 1);
3972 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
4ec11028 3973 if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
b31e1552 3974 ext4_msg(sb, KERN_WARNING, "groups count too large: %u "
4ec11028 3975 "(block count %llu, first data block %u, "
b31e1552 3976 "blocks per group %lu)", sbi->s_groups_count,
4ec11028
TT		 3977 ext4_blocks_count(es),
3978 le32_to_cpu(es->s_first_data_block),
3979 EXT4_BLOCKS_PER_GROUP(sb));
3980 goto failed_mount;
3981 }
bd81d8ee 3982 sbi->s_groups_count = blocks_count;
fb0a387d
ES		 3983 sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
3984 (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
617ba13b
MC		 3985 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
3986 EXT4_DESC_PER_BLOCK(sb);
3a4b77cd 3987 if (ext4_has_feature_meta_bg(sb)) {
2ba3e6e8 3988 if (le32_to_cpu(es->s_first_meta_bg) > db_count) {
3a4b77cd
EG		 3989 ext4_msg(sb, KERN_WARNING,
3990 "first meta block group too large: %u "
3991 "(group descriptor block count %u)",
3992 le32_to_cpu(es->s_first_meta_bg), db_count);
3993 goto failed_mount;
3994 }
3995 }
344476e1
KC		 3996 sbi->s_group_desc = kvmalloc_array(db_count,
3997 sizeof(struct buffer_head *),
3998 GFP_KERNEL);
ac27a0ec 3999 if (sbi->s_group_desc == NULL) {
b31e1552 4000 ext4_msg(sb, KERN_ERR, "not enough memory");
2cde417d 4001 ret = -ENOMEM;
ac27a0ec
DK		 4002 goto failed_mount;
4003 }
4004
705895b6 4005 bgl_lock_init(sbi->s_blockgroup_lock);
ac27a0ec 4006
85c8f176
AP		 4007 /* Pre-read the descriptors into the buffer cache */
4008 for (i = 0; i < db_count; i++) {
4009 block = descriptor_loc(sb, logical_sb_block, i);
4010 sb_breadahead(sb, block);
4011 }
4012
ac27a0ec 4013 for (i = 0; i < db_count; i++) {
70bbb3e0 4014 block = descriptor_loc(sb, logical_sb_block, i);
a8ac900b 4015 sbi->s_group_desc[i] = sb_bread_unmovable(sb, block);
ac27a0ec 4016 if (!sbi->s_group_desc[i]) {
b31e1552
ES		 4017 ext4_msg(sb, KERN_ERR,
4018 "can't read group descriptor %d", i);
ac27a0ec
DK		 4019 db_count = i;
4020 goto failed_mount2;
4021 }
4022 }
829fa70d 4023 if (!ext4_check_descriptors(sb, logical_sb_block, &first_not_zeroed)) {
b31e1552 4024 ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
6a797d27 4025 ret = -EFSCORRUPTED;
f9ae9cf5 4026 goto failed_mount2;
ac27a0ec 4027 }
772cb7c8 4028
f9ae9cf5 4029 sbi->s_gdb_count = db_count;
ac27a0ec 4030
235699a8 4031 timer_setup(&sbi->s_err_report, print_daily_error_info, 0);
04496411 4032
a75ae78f 4033 /* Register extent status tree shrinker */
eb68d0e2 4034 if (ext4_es_register_shrinker(sbi))
ce7e010a 4035 goto failed_mount3;
ce7e010a 4036
c9de560d 4037 sbi->s_stripe = ext4_get_stripe_size(sbi);
67a5da56 4038 sbi->s_extent_max_zeroout_kb = 32;
c9de560d 4039
f9ae9cf5
TT		 4040 /*
4041 * set up enough so that it can read an inode
4042 */
f6e63f90 4043 sb->s_op = &ext4_sops;
617ba13b
MC		 4044 sb->s_export_op = &ext4_export_ops;
4045 sb->s_xattr = ext4_xattr_handlers;
ffcc4182 4046#ifdef CONFIG_EXT4_FS_ENCRYPTION
a7550b30 4047 sb->s_cop = &ext4_cryptops;
ffcc4182 4048#endif
ac27a0ec 4049#ifdef CONFIG_QUOTA
617ba13b 4050 sb->dq_op = &ext4_quota_operations;
e2b911c5 4051 if (ext4_has_feature_quota(sb))
1fa5efe3 4052 sb->s_qcop = &dquot_quotactl_sysfile_ops;
262b4662
JK		 4053 else
4054 sb->s_qcop = &ext4_qctl_operations;
689c958c 4055 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP | QTYPE_MASK_PRJ;
ac27a0ec 4056#endif
85787090 4057 memcpy(&sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
f2fa2ffc 4058
ac27a0ec 4059 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
3b9d4ed2 4060 mutex_init(&sbi->s_orphan_lock);
ac27a0ec
DK		 4061
4062 sb->s_root = NULL;
4063
4064 needs_recovery = (es->s_last_orphan != 0 ||
e2b911c5 4065 ext4_has_feature_journal_needs_recovery(sb));
ac27a0ec 4066
bc98a42c 4067 if (ext4_has_feature_mmp(sb) && !sb_rdonly(sb))
c5e06d10 4068 if (ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block)))
50460fe8 4069 goto failed_mount3a;
c5e06d10 4070
ac27a0ec
DK		 4071 /*
4072 * The first inode we look at is the journal inode. Don't try
4073 * root first: it may be modified in the journal!
4074 */
e2b911c5 4075 if (!test_opt(sb, NOLOAD) && ext4_has_feature_journal(sb)) {
4753d8a2
TT		 4076 err = ext4_load_journal(sb, es, journal_devnum);
4077 if (err)
50460fe8 4078 goto failed_mount3a;
bc98a42c 4079 } else if (test_opt(sb, NOLOAD) && !sb_rdonly(sb) &&
e2b911c5 4080 ext4_has_feature_journal_needs_recovery(sb)) {
b31e1552
ES		 4081 ext4_msg(sb, KERN_ERR, "required journal recovery "
4082 "suppressed and not mounted read-only");
744692dc 4083 goto failed_mount_wq;
ac27a0ec 4084 } else {
1e381f60
DM		 4085 /* Nojournal mode, all journal mount options are illegal */
4086 if (test_opt2(sb, EXPLICIT_JOURNAL_CHECKSUM)) {
4087 ext4_msg(sb, KERN_ERR, "can't mount with "
4088 "journal_checksum, fs mounted w/o journal");
4089 goto failed_mount_wq;
4090 }
4091 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
4092 ext4_msg(sb, KERN_ERR, "can't mount with "
4093 "journal_async_commit, fs mounted w/o journal");
4094 goto failed_mount_wq;
4095 }
4096 if (sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) {
4097 ext4_msg(sb, KERN_ERR, "can't mount with "
4098 "commit=%lu, fs mounted w/o journal",
4099 sbi->s_commit_interval / HZ);
4100 goto failed_mount_wq;
4101 }
4102 if (EXT4_MOUNT_DATA_FLAGS &
4103 (sbi->s_mount_opt ^ sbi->s_def_mount_opt)) {
4104 ext4_msg(sb, KERN_ERR, "can't mount with "
4105 "data=, fs mounted w/o journal");
4106 goto failed_mount_wq;
4107 }
4108 sbi->s_def_mount_opt &= EXT4_MOUNT_JOURNAL_CHECKSUM;
4109 clear_opt(sb, JOURNAL_CHECKSUM);
fd8c37ec 4110 clear_opt(sb, DATA_FLAGS);
0390131b
FM		 4111 sbi->s_journal = NULL;
4112 needs_recovery = 0;
4113 goto no_journal;
ac27a0ec
DK		 4114 }
4115
e2b911c5 4116 if (ext4_has_feature_64bit(sb) &&
eb40a09c
JS		 4117 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
4118 JBD2_FEATURE_INCOMPAT_64BIT)) {
b31e1552 4119 ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
744692dc 4120 goto failed_mount_wq;
eb40a09c
JS		 4121 }
4122
25ed6e8a
DW		 4123 if (!set_journal_csum_feature_set(sb)) {
4124 ext4_msg(sb, KERN_ERR, "Failed to set journal checksum "
4125 "feature set");
4126 goto failed_mount_wq;
d4da6c9c 4127 }
818d276c 4128
ac27a0ec
DK		 4129 /* We have now updated the journal if required, so we can
4130 * validate the data journaling mode. */
4131 switch (test_opt(sb, DATA_FLAGS)) {
4132 case 0:
4133 /* No mode set, assume a default based on the journal
63f57933
AM		 4134 * capabilities: ORDERED_DATA if the journal can
4135 * cope, else JOURNAL_DATA
4136 */
dab291af 4137 if (jbd2_journal_check_available_features
27f394a7 4138 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
fd8c37ec 4139 set_opt(sb, ORDERED_DATA);
27f394a7
TN		 4140 sbi->s_def_mount_opt |= EXT4_MOUNT_ORDERED_DATA;
4141 } else {
fd8c37ec 4142 set_opt(sb, JOURNAL_DATA);
27f394a7
TN		 4143 sbi->s_def_mount_opt |= EXT4_MOUNT_JOURNAL_DATA;
4144 }
ac27a0ec
DK		 4145 break;
4146
617ba13b
MC		 4147 case EXT4_MOUNT_ORDERED_DATA:
4148 case EXT4_MOUNT_WRITEBACK_DATA:
dab291af
MC		 4149 if (!jbd2_journal_check_available_features
4150 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
b31e1552
ES		 4151 ext4_msg(sb, KERN_ERR, "Journal does not support "
4152 "requested data journaling mode");
744692dc 4153 goto failed_mount_wq;
ac27a0ec
DK		 4154 }
4155 default:
4156 break;
4157 }
ab04df78
JK		 4158
4159 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA &&
4160 test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
4161 ext4_msg(sb, KERN_ERR, "can't mount with "
4162 "journal_async_commit in data=ordered mode");
4163 goto failed_mount_wq;
4164 }
4165
b3881f74 4166 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
ac27a0ec 4167
18aadd47
BJ		 4168 sbi->s_journal->j_commit_callback = ext4_journal_commit_callback;
4169
ce7e010a 4170no_journal:
cdb7ee4c
TE		 4171 if (!test_opt(sb, NO_MBCACHE)) {
4172 sbi->s_ea_block_cache = ext4_xattr_create_cache();
4173 if (!sbi->s_ea_block_cache) {
dec214d0 4174 ext4_msg(sb, KERN_ERR,
cdb7ee4c 4175 "Failed to create ea_block_cache");
dec214d0
TE		 4176 goto failed_mount_wq;
4177 }
cdb7ee4c
TE		 4178
4179 if (ext4_has_feature_ea_inode(sb)) {
4180 sbi->s_ea_inode_cache = ext4_xattr_create_cache();
4181 if (!sbi->s_ea_inode_cache) {
4182 ext4_msg(sb, KERN_ERR,
4183 "Failed to create ea_inode_cache");
4184 goto failed_mount_wq;
4185 }
4186 }
9c191f70
M		 4187 }
4188
e2b911c5 4189 if ((DUMMY_ENCRYPTION_ENABLED(sbi) || ext4_has_feature_encrypt(sb)) &&
09cbfeaf 4190 (blocksize != PAGE_SIZE)) {
1cb767cd
TT		 4191 ext4_msg(sb, KERN_ERR,
4192 "Unsupported blocksize for fs encryption");
4193 goto failed_mount_wq;
4194 }
4195
bc98a42c 4196 if (DUMMY_ENCRYPTION_ENABLED(sbi) && !sb_rdonly(sb) &&
e2b911c5
DW		 4197 !ext4_has_feature_encrypt(sb)) {
4198 ext4_set_feature_encrypt(sb);
6ddb2447
TT		 4199 ext4_commit_super(sb, 1);
4200 }
4201
952fc18e
TT		 4202 /*
4203 * Get the # of file system overhead blocks from the
4204 * superblock if present.
4205 */
4206 if (es->s_overhead_clusters)
4207 sbi->s_overhead = le32_to_cpu(es->s_overhead_clusters);
4208 else {
07aa2ea1
LC		 4209 err = ext4_calculate_overhead(sb);
4210 if (err)
952fc18e
TT		 4211 goto failed_mount_wq;
4212 }
4213
fd89d5f2
TH		 4214 /*
4215 * The maximum number of concurrent works can be high and
4216 * concurrency isn't really necessary. Limit it to 1.
4217 */
2e8fa54e
JK		 4218 EXT4_SB(sb)->rsv_conversion_wq =
4219 alloc_workqueue("ext4-rsv-conversion", WQ_MEM_RECLAIM | WQ_UNBOUND, 1);
4220 if (!EXT4_SB(sb)->rsv_conversion_wq) {
4221 printk(KERN_ERR "EXT4-fs: failed to create workqueue\n");
07aa2ea1 4222 ret = -ENOMEM;
2e8fa54e
JK		 4223 goto failed_mount4;
4224 }
4225
ac27a0ec 4226 /*
dab291af 4227 * The jbd2_journal_load will have done any necessary log recovery,
ac27a0ec
DK		 4228 * so we can safely mount the rest of the filesystem now.
4229 */
4230
1d1fe1ee
DH		 4231 root = ext4_iget(sb, EXT4_ROOT_INO);
4232 if (IS_ERR(root)) {
b31e1552 4233 ext4_msg(sb, KERN_ERR, "get root inode failed");
1d1fe1ee 4234 ret = PTR_ERR(root);
32a9bb57 4235 root = NULL;
ac27a0ec
DK		 4236 goto failed_mount4;
4237 }
4238 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
b31e1552 4239 ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
94bf608a 4240 iput(root);
ac27a0ec
DK		 4241 goto failed_mount4;
4242 }
48fde701 4243 sb->s_root = d_make_root(root);
1d1fe1ee 4244 if (!sb->s_root) {
b31e1552 4245 ext4_msg(sb, KERN_ERR, "get root dentry failed");
1d1fe1ee
DH		 4246 ret = -ENOMEM;
4247 goto failed_mount4;
4248 }
ac27a0ec 4249
c89128a0
JK		 4250 ret = ext4_setup_super(sb, es, sb_rdonly(sb));
4251 if (ret == -EROFS) {
1751e8a6 4252 sb->s_flags |= SB_RDONLY;
c89128a0
JK		 4253 ret = 0;
4254 } else if (ret)
4255 goto failed_mount4a;
ef7f3835
KS		 4256
4257 /* determine the minimum size of new large inodes, if present */
670e9875
TT		 4258 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE &&
4259 sbi->s_want_extra_isize == 0) {
ef7f3835
KS		 4260 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
4261 EXT4_GOOD_OLD_INODE_SIZE;
e2b911c5 4262 if (ext4_has_feature_extra_isize(sb)) {
ef7f3835
KS		 4263 if (sbi->s_want_extra_isize <
4264 le16_to_cpu(es->s_want_extra_isize))
4265 sbi->s_want_extra_isize =
4266 le16_to_cpu(es->s_want_extra_isize);
4267 if (sbi->s_want_extra_isize <
4268 le16_to_cpu(es->s_min_extra_isize))
4269 sbi->s_want_extra_isize =
4270 le16_to_cpu(es->s_min_extra_isize);
4271 }
4272 }
4273 /* Check if enough inode space is available */
4274 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
4275 sbi->s_inode_size) {
4276 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
4277 EXT4_GOOD_OLD_INODE_SIZE;
b31e1552
ES		 4278 ext4_msg(sb, KERN_INFO, "required extra inode space not"
4279 "available");
ef7f3835
KS		 4280 }
4281
b5799018 4282 ext4_set_resv_clusters(sb);
27dd4385 4283
6fd058f7
TT		 4284 err = ext4_setup_system_zone(sb);
4285 if (err) {
b31e1552 4286 ext4_msg(sb, KERN_ERR, "failed to initialize system "
fbe845dd 4287 "zone (%d)", err);
f9ae9cf5
TT		 4288 goto failed_mount4a;
4289 }
4290
4291 ext4_ext_init(sb);
4292 err = ext4_mb_init(sb);
4293 if (err) {
4294 ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)",
4295 err);
dcf2d804 4296 goto failed_mount5;
c2774d84
AK		 4297 }
4298
d5e03cbb
TT		 4299 block = ext4_count_free_clusters(sb);
4300 ext4_free_blocks_count_set(sbi->s_es,
4301 EXT4_C2B(sbi, block));
908c7f19
TH		 4302 err = percpu_counter_init(&sbi->s_freeclusters_counter, block,
4303 GFP_KERNEL);
d5e03cbb
TT		 4304 if (!err) {
4305 unsigned long freei = ext4_count_free_inodes(sb);
4306 sbi->s_es->s_free_inodes_count = cpu_to_le32(freei);
908c7f19
TH		 4307 err = percpu_counter_init(&sbi->s_freeinodes_counter, freei,
4308 GFP_KERNEL);
d5e03cbb
TT		 4309 }
4310 if (!err)
4311 err = percpu_counter_init(&sbi->s_dirs_counter,
908c7f19 4312 ext4_count_dirs(sb), GFP_KERNEL);
d5e03cbb 4313 if (!err)
908c7f19
TH		 4314 err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0,
4315 GFP_KERNEL);
c8585c6f
DJ		 4316 if (!err)
4317 err = percpu_init_rwsem(&sbi->s_journal_flag_rwsem);
4318
d5e03cbb
TT		 4319 if (err) {
4320 ext4_msg(sb, KERN_ERR, "insufficient memory");
4321 goto failed_mount6;
4322 }
4323
e2b911c5 4324 if (ext4_has_feature_flex_bg(sb))
d5e03cbb
TT		 4325 if (!ext4_fill_flex_info(sb)) {
4326 ext4_msg(sb, KERN_ERR,
4327 "unable to initialize "
4328 "flex_bg meta info!");
4329 goto failed_mount6;
4330 }
4331
bfff6873
LC		 4332 err = ext4_register_li_request(sb, first_not_zeroed);
4333 if (err)
dcf2d804 4334 goto failed_mount6;
bfff6873 4335
b5799018 4336 err = ext4_register_sysfs(sb);
dcf2d804
TM		 4337 if (err)
4338 goto failed_mount7;
3197ebdb 4339
9b2ff357
JK		 4340#ifdef CONFIG_QUOTA
4341 /* Enable quota usage during mount. */
bc98a42c 4342 if (ext4_has_feature_quota(sb) && !sb_rdonly(sb)) {
9b2ff357
JK		 4343 err = ext4_enable_quotas(sb);
4344 if (err)
4345 goto failed_mount8;
4346 }
4347#endif /* CONFIG_QUOTA */
4348
617ba13b
MC		 4349 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
4350 ext4_orphan_cleanup(sb, es);
4351 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
0390131b 4352 if (needs_recovery) {
b31e1552 4353 ext4_msg(sb, KERN_INFO, "recovery complete");
0390131b
FM		 4354 ext4_mark_recovery_complete(sb, es);
4355 }
4356 if (EXT4_SB(sb)->s_journal) {
4357 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
4358 descr = " journalled data mode";
4359 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
4360 descr = " ordered data mode";
4361 else
4362 descr = " writeback data mode";
4363 } else
4364 descr = "out journal";
4365
79add3a3
LC		 4366 if (test_opt(sb, DISCARD)) {
4367 struct request_queue *q = bdev_get_queue(sb->s_bdev);
4368 if (!blk_queue_discard(q))
4369 ext4_msg(sb, KERN_WARNING,
4370 "mounting with \"discard\" option, but "
4371 "the device does not support discard");
4372 }
4373
e294a537
TT		 4374 if (___ratelimit(&ext4_mount_msg_ratelimit, "EXT4-fs mount"))
4375 ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. "
5aee0f8a
TT		 4376 "Opts: %.*s%s%s", descr,
4377 (int) sizeof(sbi->s_es->s_mount_opts),
4378 sbi->s_es->s_mount_opts,
e294a537 4379 *sbi->s_es->s_mount_opts ? "; " : "", orig_data);
ac27a0ec 4380
66e61a9e
TT		 4381 if (es->s_error_count)
4382 mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */
ac27a0ec 4383
efbed4dc
TT		 4384 /* Enable message ratelimiting. Default is 10 messages per 5 secs. */
4385 ratelimit_state_init(&sbi->s_err_ratelimit_state, 5 * HZ, 10);
4386 ratelimit_state_init(&sbi->s_warning_ratelimit_state, 5 * HZ, 10);
4387 ratelimit_state_init(&sbi->s_msg_ratelimit_state, 5 * HZ, 10);
4388
d4c402d9 4389 kfree(orig_data);
ac27a0ec
DK		 4390 return 0;
4391
617ba13b 4392cantfind_ext4:
ac27a0ec 4393 if (!silent)
b31e1552 4394 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
ac27a0ec
DK		 4395 goto failed_mount;
4396
72ba7450
TT		 4397#ifdef CONFIG_QUOTA
4398failed_mount8:
ebd173be 4399 ext4_unregister_sysfs(sb);
72ba7450 4400#endif
dcf2d804
TM		 4401failed_mount7:
4402 ext4_unregister_li_request(sb);
4403failed_mount6:
f9ae9cf5 4404 ext4_mb_release(sb);
d5e03cbb 4405 if (sbi->s_flex_groups)
b93b41d4 4406 kvfree(sbi->s_flex_groups);
d5e03cbb
TT		 4407 percpu_counter_destroy(&sbi->s_freeclusters_counter);
4408 percpu_counter_destroy(&sbi->s_freeinodes_counter);
4409 percpu_counter_destroy(&sbi->s_dirs_counter);
4410 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
00764937 4411failed_mount5:
f9ae9cf5
TT		 4412 ext4_ext_release(sb);
4413 ext4_release_system_zone(sb);
4414failed_mount4a:
94bf608a 4415 dput(sb->s_root);
32a9bb57 4416 sb->s_root = NULL;
94bf608a 4417failed_mount4:
b31e1552 4418 ext4_msg(sb, KERN_ERR, "mount failed");
2e8fa54e
JK		 4419 if (EXT4_SB(sb)->rsv_conversion_wq)
4420 destroy_workqueue(EXT4_SB(sb)->rsv_conversion_wq);
4c0425ff 4421failed_mount_wq:
dec214d0
TE		 4422 if (sbi->s_ea_inode_cache) {
4423 ext4_xattr_destroy_cache(sbi->s_ea_inode_cache);
4424 sbi->s_ea_inode_cache = NULL;
4425 }
47387409
TE		 4426 if (sbi->s_ea_block_cache) {
4427 ext4_xattr_destroy_cache(sbi->s_ea_block_cache);
4428 sbi->s_ea_block_cache = NULL;
82939d79 4429 }
0390131b
FM		 4430 if (sbi->s_journal) {
4431 jbd2_journal_destroy(sbi->s_journal);
4432 sbi->s_journal = NULL;
4433 }
50460fe8 4434failed_mount3a:
d3922a77 4435 ext4_es_unregister_shrinker(sbi);
eb68d0e2 4436failed_mount3:
9105bb14 4437 del_timer_sync(&sbi->s_err_report);
c5e06d10
JL		 4438 if (sbi->s_mmp_tsk)
4439 kthread_stop(sbi->s_mmp_tsk);
ac27a0ec
DK		 4440failed_mount2:
4441 for (i = 0; i < db_count; i++)
4442 brelse(sbi->s_group_desc[i]);
b93b41d4 4443 kvfree(sbi->s_group_desc);
ac27a0ec 4444failed_mount:
0441984a
DW		 4445 if (sbi->s_chksum_driver)
4446 crypto_free_shash(sbi->s_chksum_driver);
ac27a0ec 4447#ifdef CONFIG_QUOTA
a2d4a646 4448 for (i = 0; i < EXT4_MAXQUOTAS; i++)
ac27a0ec
DK		 4449 kfree(sbi->s_qf_names[i]);
4450#endif
617ba13b 4451 ext4_blkdev_remove(sbi);
ac27a0ec
DK		 4452 brelse(bh);
4453out_fail:
4454 sb->s_fs_info = NULL;
f6830165 4455 kfree(sbi->s_blockgroup_lock);
5aee0f8a 4456out_free_base:
ac27a0ec 4457 kfree(sbi);
d4c402d9 4458 kfree(orig_data);
5e405595 4459 fs_put_dax(dax_dev);
07aa2ea1 4460 return err ? err : ret;
ac27a0ec
DK		 4461}
4462
4463/*
4464 * Setup any per-fs journal parameters now. We'll do this both on
4465 * initial mount, once the journal has been initialised but before we've
4466 * done any recovery; and again on any subsequent remount.
4467 */
617ba13b 4468static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
ac27a0ec 4469{
617ba13b 4470 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4471
30773840
TT		 4472 journal->j_commit_interval = sbi->s_commit_interval;
4473 journal->j_min_batch_time = sbi->s_min_batch_time;
4474 journal->j_max_batch_time = sbi->s_max_batch_time;
ac27a0ec 4475
a931da6a 4476 write_lock(&journal->j_state_lock);
ac27a0ec 4477 if (test_opt(sb, BARRIER))
dab291af 4478 journal->j_flags |= JBD2_BARRIER;
ac27a0ec 4479 else
dab291af 4480 journal->j_flags &= ~JBD2_BARRIER;
5bf5683a
HK		 4481 if (test_opt(sb, DATA_ERR_ABORT))
4482 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
4483 else
4484 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
a931da6a 4485 write_unlock(&journal->j_state_lock);
ac27a0ec
DK		 4486}
4487
c6cb7e77
EW		 4488static struct inode *ext4_get_journal_inode(struct super_block *sb,
4489 unsigned int journal_inum)
ac27a0ec
DK		 4490{
4491 struct inode *journal_inode;
ac27a0ec 4492
c6cb7e77
EW		 4493 /*
4494 * Test for the existence of a valid inode on disk. Bad things
4495 * happen if we iget() an unused inode, as the subsequent iput()
4496 * will try to delete it.
4497 */
1d1fe1ee
DH		 4498 journal_inode = ext4_iget(sb, journal_inum);
4499 if (IS_ERR(journal_inode)) {
b31e1552 4500 ext4_msg(sb, KERN_ERR, "no journal found");
ac27a0ec
DK		 4501 return NULL;
4502 }
4503 if (!journal_inode->i_nlink) {
4504 make_bad_inode(journal_inode);
4505 iput(journal_inode);
b31e1552 4506 ext4_msg(sb, KERN_ERR, "journal inode is deleted");
ac27a0ec
DK		 4507 return NULL;
4508 }
4509
e5f8eab8 4510 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
ac27a0ec 4511 journal_inode, journal_inode->i_size);
1d1fe1ee 4512 if (!S_ISREG(journal_inode->i_mode)) {
b31e1552 4513 ext4_msg(sb, KERN_ERR, "invalid journal inode");
ac27a0ec
DK		 4514 iput(journal_inode);
4515 return NULL;
4516 }
c6cb7e77
EW		 4517 return journal_inode;
4518}
4519
4520static journal_t *ext4_get_journal(struct super_block *sb,
4521 unsigned int journal_inum)
4522{
4523 struct inode *journal_inode;
4524 journal_t *journal;
4525
4526 BUG_ON(!ext4_has_feature_journal(sb));
4527
4528 journal_inode = ext4_get_journal_inode(sb, journal_inum);
4529 if (!journal_inode)
4530 return NULL;
ac27a0ec 4531
dab291af 4532 journal = jbd2_journal_init_inode(journal_inode);
ac27a0ec 4533 if (!journal) {
b31e1552 4534 ext4_msg(sb, KERN_ERR, "Could not load journal inode");
ac27a0ec
DK		 4535 iput(journal_inode);
4536 return NULL;
4537 }
4538 journal->j_private = sb;
617ba13b 4539 ext4_init_journal_params(sb, journal);
ac27a0ec
DK		 4540 return journal;
4541}
4542
617ba13b 4543static journal_t *ext4_get_dev_journal(struct super_block *sb,
ac27a0ec
DK		 4544 dev_t j_dev)
4545{
2b2d6d01 4546 struct buffer_head *bh;
ac27a0ec 4547 journal_t *journal;
617ba13b
MC		 4548 ext4_fsblk_t start;
4549 ext4_fsblk_t len;
ac27a0ec 4550 int hblock, blocksize;
617ba13b 4551 ext4_fsblk_t sb_block;
ac27a0ec 4552 unsigned long offset;
2b2d6d01 4553 struct ext4_super_block *es;
ac27a0ec
DK		 4554 struct block_device *bdev;
4555
e2b911c5 4556 BUG_ON(!ext4_has_feature_journal(sb));
0390131b 4557
b31e1552 4558 bdev = ext4_blkdev_get(j_dev, sb);
ac27a0ec
DK		 4559 if (bdev == NULL)
4560 return NULL;
4561
ac27a0ec 4562 blocksize = sb->s_blocksize;
e1defc4f 4563 hblock = bdev_logical_block_size(bdev);
ac27a0ec 4564 if (blocksize < hblock) {
b31e1552
ES		 4565 ext4_msg(sb, KERN_ERR,
4566 "blocksize too small for journal device");
ac27a0ec
DK		 4567 goto out_bdev;
4568 }
4569
617ba13b
MC		 4570 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
4571 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
ac27a0ec
DK		 4572 set_blocksize(bdev, blocksize);
4573 if (!(bh = __bread(bdev, sb_block, blocksize))) {
b31e1552
ES		 4574 ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
4575 "external journal");
ac27a0ec
DK		 4576 goto out_bdev;
4577 }
4578
2716b802 4579 es = (struct ext4_super_block *) (bh->b_data + offset);
617ba13b 4580 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
ac27a0ec 4581 !(le32_to_cpu(es->s_feature_incompat) &
617ba13b 4582 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
b31e1552
ES		 4583 ext4_msg(sb, KERN_ERR, "external journal has "
4584 "bad superblock");
ac27a0ec
DK		 4585 brelse(bh);
4586 goto out_bdev;
4587 }
4588
df4763be
DW		 4589 if ((le32_to_cpu(es->s_feature_ro_compat) &
4590 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) &&
4591 es->s_checksum != ext4_superblock_csum(sb, es)) {
4592 ext4_msg(sb, KERN_ERR, "external journal has "
4593 "corrupt superblock");
4594 brelse(bh);
4595 goto out_bdev;
4596 }
4597
617ba13b 4598 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
b31e1552 4599 ext4_msg(sb, KERN_ERR, "journal UUID does not match");
ac27a0ec
DK		 4600 brelse(bh);
4601 goto out_bdev;
4602 }
4603
bd81d8ee 4604 len = ext4_blocks_count(es);
ac27a0ec
DK		 4605 start = sb_block + 1;
4606 brelse(bh); /* we're done with the superblock */
4607
dab291af 4608 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
ac27a0ec
DK		 4609 start, len, blocksize);
4610 if (!journal) {
b31e1552 4611 ext4_msg(sb, KERN_ERR, "failed to create device journal");
ac27a0ec
DK		 4612 goto out_bdev;
4613 }
4614 journal->j_private = sb;
dfec8a14 4615 ll_rw_block(REQ_OP_READ, REQ_META | REQ_PRIO, 1, &journal->j_sb_buffer);
ac27a0ec
DK		 4616 wait_on_buffer(journal->j_sb_buffer);
4617 if (!buffer_uptodate(journal->j_sb_buffer)) {
b31e1552 4618 ext4_msg(sb, KERN_ERR, "I/O error on journal device");
ac27a0ec
DK		 4619 goto out_journal;
4620 }
4621 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
b31e1552
ES		 4622 ext4_msg(sb, KERN_ERR, "External journal has more than one "
4623 "user (unsupported) - %d",
ac27a0ec
DK		 4624 be32_to_cpu(journal->j_superblock->s_nr_users));
4625 goto out_journal;
4626 }
617ba13b
MC		 4627 EXT4_SB(sb)->journal_bdev = bdev;
4628 ext4_init_journal_params(sb, journal);
ac27a0ec 4629 return journal;
0b8e58a1 4630
ac27a0ec 4631out_journal:
dab291af 4632 jbd2_journal_destroy(journal);
ac27a0ec 4633out_bdev:
617ba13b 4634 ext4_blkdev_put(bdev);
ac27a0ec
DK		 4635 return NULL;
4636}
4637
617ba13b
MC		 4638static int ext4_load_journal(struct super_block *sb,
4639 struct ext4_super_block *es,
ac27a0ec
DK		 4640 unsigned long journal_devnum)
4641{
4642 journal_t *journal;
4643 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
4644 dev_t journal_dev;
4645 int err = 0;
4646 int really_read_only;
4647
e2b911c5 4648 BUG_ON(!ext4_has_feature_journal(sb));
0390131b 4649
ac27a0ec
DK		 4650 if (journal_devnum &&
4651 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
b31e1552
ES		 4652 ext4_msg(sb, KERN_INFO, "external journal device major/minor "
4653 "numbers have changed");
ac27a0ec
DK		 4654 journal_dev = new_decode_dev(journal_devnum);
4655 } else
4656 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
4657
4658 really_read_only = bdev_read_only(sb->s_bdev);
4659
4660 /*
4661 * Are we loading a blank journal or performing recovery after a
4662 * crash? For recovery, we need to check in advance whether we
4663 * can get read-write access to the device.
4664 */
e2b911c5 4665 if (ext4_has_feature_journal_needs_recovery(sb)) {
bc98a42c 4666 if (sb_rdonly(sb)) {
b31e1552
ES		 4667 ext4_msg(sb, KERN_INFO, "INFO: recovery "
4668 "required on readonly filesystem");
ac27a0ec 4669 if (really_read_only) {
b31e1552 4670 ext4_msg(sb, KERN_ERR, "write access "
d98bf8cd
SR		 4671 "unavailable, cannot proceed "
4672 "(try mounting with noload)");
ac27a0ec
DK		 4673 return -EROFS;
4674 }
b31e1552
ES		 4675 ext4_msg(sb, KERN_INFO, "write access will "
4676 "be enabled during recovery");
ac27a0ec
DK		 4677 }
4678 }
4679
4680 if (journal_inum && journal_dev) {
b31e1552
ES		 4681 ext4_msg(sb, KERN_ERR, "filesystem has both journal "
4682 "and inode journals!");
ac27a0ec
DK		 4683 return -EINVAL;
4684 }
4685
4686 if (journal_inum) {
617ba13b 4687 if (!(journal = ext4_get_journal(sb, journal_inum)))
ac27a0ec
DK		 4688 return -EINVAL;
4689 } else {
617ba13b 4690 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
ac27a0ec
DK		 4691 return -EINVAL;
4692 }
4693
90576c0b 4694 if (!(journal->j_flags & JBD2_BARRIER))
b31e1552 4695 ext4_msg(sb, KERN_INFO, "barriers disabled");
4776004f 4696
e2b911c5 4697 if (!ext4_has_feature_journal_needs_recovery(sb))
dab291af 4698 err = jbd2_journal_wipe(journal, !really_read_only);
1c13d5c0
TT		 4699 if (!err) {
4700 char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL);
4701 if (save)
4702 memcpy(save, ((char *) es) +
4703 EXT4_S_ERR_START, EXT4_S_ERR_LEN);
dab291af 4704 err = jbd2_journal_load(journal);
1c13d5c0
TT		 4705 if (save)
4706 memcpy(((char *) es) + EXT4_S_ERR_START,
4707 save, EXT4_S_ERR_LEN);
4708 kfree(save);
4709 }
ac27a0ec
DK		 4710
4711 if (err) {
b31e1552 4712 ext4_msg(sb, KERN_ERR, "error loading journal");
dab291af 4713 jbd2_journal_destroy(journal);
ac27a0ec
DK		 4714 return err;
4715 }
4716
617ba13b
MC		 4717 EXT4_SB(sb)->s_journal = journal;
4718 ext4_clear_journal_err(sb, es);
ac27a0ec 4719
c41303ce 4720 if (!really_read_only && journal_devnum &&
ac27a0ec
DK		 4721 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
4722 es->s_journal_dev = cpu_to_le32(journal_devnum);
ac27a0ec
DK		 4723
4724 /* Make sure we flush the recovery flag to disk. */
e2d67052 4725 ext4_commit_super(sb, 1);
ac27a0ec
DK		 4726 }
4727
4728 return 0;
4729}
4730
e2d67052 4731static int ext4_commit_super(struct super_block *sb, int sync)
ac27a0ec 4732{
e2d67052 4733 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
617ba13b 4734 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
c4be0c1d 4735 int error = 0;
ac27a0ec 4736
bdfe0cbd 4737 if (!sbh || block_device_ejected(sb))
c4be0c1d 4738 return error;
71290b36
TT		 4739 /*
4740 * If the file system is mounted read-only, don't update the
4741 * superblock write time. This avoids updating the superblock
4742 * write time when we are mounting the root file system
4743 * read/only but we need to replay the journal; at that point,
4744 * for people who are east of GMT and who make their clock
4745 * tick in localtime for Windows bug-for-bug compatibility,
4746 * the clock is set in the future, and this will cause e2fsck
4747 * to complain and force a full file system check.
4748 */
1751e8a6 4749 if (!(sb->s_flags & SB_RDONLY))
71290b36 4750 es->s_wtime = cpu_to_le32(get_seconds());
f613dfcb
TT		 4751 if (sb->s_bdev->bd_part)
4752 es->s_kbytes_written =
4753 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written +
afc32f7e
TT		 4754 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
4755 EXT4_SB(sb)->s_sectors_written_start) >> 1));
f613dfcb
TT		 4756 else
4757 es->s_kbytes_written =
4758 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written);
d5e03cbb
TT		 4759 if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeclusters_counter))
4760 ext4_free_blocks_count_set(es,
57042651
TT		 4761 EXT4_C2B(EXT4_SB(sb), percpu_counter_sum_positive(
4762 &EXT4_SB(sb)->s_freeclusters_counter)));
d5e03cbb
TT		 4763 if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeinodes_counter))
4764 es->s_free_inodes_count =
4765 cpu_to_le32(percpu_counter_sum_positive(
ce7e010a 4766 &EXT4_SB(sb)->s_freeinodes_counter));
ac27a0ec 4767 BUFFER_TRACE(sbh, "marking dirty");
06db49e6 4768 ext4_superblock_csum_set(sb);
1566a48a
TT		 4769 if (sync)
4770 lock_buffer(sbh);
4743f839
PKS		 4771 if (buffer_write_io_error(sbh)) {
4772 /*
4773 * Oh, dear. A previous attempt to write the
4774 * superblock failed. This could happen because the
4775 * USB device was yanked out. Or it could happen to
4776 * be a transient write error and maybe the block will
4777 * be remapped. Nothing we can do but to retry the
4778 * write and hope for the best.
4779 */
4780 ext4_msg(sb, KERN_ERR, "previous I/O error to "
4781 "superblock detected");
4782 clear_buffer_write_io_error(sbh);
4783 set_buffer_uptodate(sbh);
4784 }
ac27a0ec 4785 mark_buffer_dirty(sbh);
914258bf 4786 if (sync) {
1566a48a 4787 unlock_buffer(sbh);
564bc402 4788 error = __sync_dirty_buffer(sbh,
00473374 4789 REQ_SYNC | (test_opt(sb, BARRIER) ? REQ_FUA : 0));
c89128a0 4790 if (buffer_write_io_error(sbh)) {
b31e1552
ES		 4791 ext4_msg(sb, KERN_ERR, "I/O error while writing "
4792 "superblock");
914258bf
TT		 4793 clear_buffer_write_io_error(sbh);
4794 set_buffer_uptodate(sbh);
4795 }
4796 }
c4be0c1d 4797 return error;
ac27a0ec
DK		 4798}
4799
ac27a0ec
DK		 4800/*
4801 * Have we just finished recovery? If so, and if we are mounting (or
4802 * remounting) the filesystem readonly, then we will end up with a
4803 * consistent fs on disk. Record that fact.
4804 */
2b2d6d01
TT		 4805static void ext4_mark_recovery_complete(struct super_block *sb,
4806 struct ext4_super_block *es)
ac27a0ec 4807{
617ba13b 4808 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 4809
e2b911c5 4810 if (!ext4_has_feature_journal(sb)) {
0390131b
FM		 4811 BUG_ON(journal != NULL);
4812 return;
4813 }
dab291af 4814 jbd2_journal_lock_updates(journal);
7ffe1ea8
HK		 4815 if (jbd2_journal_flush(journal) < 0)
4816 goto out;
4817
bc98a42c 4818 if (ext4_has_feature_journal_needs_recovery(sb) && sb_rdonly(sb)) {
e2b911c5 4819 ext4_clear_feature_journal_needs_recovery(sb);
e2d67052 4820 ext4_commit_super(sb, 1);
ac27a0ec 4821 }
7ffe1ea8
HK		 4822
4823out:
dab291af 4824 jbd2_journal_unlock_updates(journal);
ac27a0ec
DK		 4825}
4826
4827/*
4828 * If we are mounting (or read-write remounting) a filesystem whose journal
4829 * has recorded an error from a previous lifetime, move that error to the
4830 * main filesystem now.
4831 */
2b2d6d01
TT		 4832static void ext4_clear_journal_err(struct super_block *sb,
4833 struct ext4_super_block *es)
ac27a0ec
DK		 4834{
4835 journal_t *journal;
4836 int j_errno;
4837 const char *errstr;
4838
e2b911c5 4839 BUG_ON(!ext4_has_feature_journal(sb));
0390131b 4840
617ba13b 4841 journal = EXT4_SB(sb)->s_journal;
ac27a0ec
DK		 4842
4843 /*
4844 * Now check for any error status which may have been recorded in the
617ba13b 4845 * journal by a prior ext4_error() or ext4_abort()
ac27a0ec
DK		 4846 */
4847
dab291af 4848 j_errno = jbd2_journal_errno(journal);
ac27a0ec
DK		 4849 if (j_errno) {
4850 char nbuf[16];
4851
617ba13b 4852 errstr = ext4_decode_error(sb, j_errno, nbuf);
12062ddd 4853 ext4_warning(sb, "Filesystem error recorded "
ac27a0ec 4854 "from previous mount: %s", errstr);
12062ddd 4855 ext4_warning(sb, "Marking fs in need of filesystem check.");
ac27a0ec 4856
617ba13b
MC		 4857 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
4858 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
e2d67052 4859 ext4_commit_super(sb, 1);
ac27a0ec 4860
dab291af 4861 jbd2_journal_clear_err(journal);
d796c52e 4862 jbd2_journal_update_sb_errno(journal);
ac27a0ec
DK		 4863 }
4864}
4865
4866/*
4867 * Force the running and committing transactions to commit,
4868 * and wait on the commit.
4869 */
617ba13b 4870int ext4_force_commit(struct super_block *sb)
ac27a0ec
DK		 4871{
4872 journal_t *journal;
ac27a0ec 4873
bc98a42c 4874 if (sb_rdonly(sb))
ac27a0ec
DK		 4875 return 0;
4876
617ba13b 4877 journal = EXT4_SB(sb)->s_journal;
b1deefc9 4878 return ext4_journal_force_commit(journal);
ac27a0ec
DK		 4879}
4880
617ba13b 4881static int ext4_sync_fs(struct super_block *sb, int wait)
ac27a0ec 4882{
14ce0cb4 4883 int ret = 0;
9eddacf9 4884 tid_t target;
06a407f1 4885 bool needs_barrier = false;
8d5d02e6 4886 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4887
49598e04 4888 if (unlikely(ext4_forced_shutdown(sbi)))
0db1ff22
TT		 4889 return 0;
4890
9bffad1e 4891 trace_ext4_sync_fs(sb, wait);
2e8fa54e 4892 flush_workqueue(sbi->rsv_conversion_wq);
a1177825
JK		 4893 /*
4894 * Writeback quota in non-journalled quota case - journalled quota has
4895 * no dirty dquots
4896 */
4897 dquot_writeback_dquots(sb, -1);
06a407f1
DM		 4898 /*
4899 * Data writeback is possible w/o journal transaction, so barrier must
4900 * being sent at the end of the function. But we can skip it if
4901 * transaction_commit will do it for us.
4902 */
bda32530
TT		 4903 if (sbi->s_journal) {
4904 target = jbd2_get_latest_transaction(sbi->s_journal);
4905 if (wait && sbi->s_journal->j_flags & JBD2_BARRIER &&
4906 !jbd2_trans_will_send_data_barrier(sbi->s_journal, target))
4907 needs_barrier = true;
4908
4909 if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
4910 if (wait)
4911 ret = jbd2_log_wait_commit(sbi->s_journal,
4912 target);
4913 }
4914 } else if (wait && test_opt(sb, BARRIER))
06a407f1 4915 needs_barrier = true;
06a407f1
DM		 4916 if (needs_barrier) {
4917 int err;
4918 err = blkdev_issue_flush(sb->s_bdev, GFP_KERNEL, NULL);
4919 if (!ret)
4920 ret = err;
0390131b 4921 }
06a407f1
DM		 4922
4923 return ret;
4924}
4925
ac27a0ec
DK		 4926/*
4927 * LVM calls this function before a (read-only) snapshot is created. This
4928 * gives us a chance to flush the journal completely and mark the fs clean.
be4f27d3
YY		 4929 *
4930 * Note that only this function cannot bring a filesystem to be in a clean
8e8ad8a5
JK		 4931 * state independently. It relies on upper layer to stop all data & metadata
4932 * modifications.
ac27a0ec 4933 */
c4be0c1d 4934static int ext4_freeze(struct super_block *sb)
ac27a0ec 4935{
c4be0c1d
TS		 4936 int error = 0;
4937 journal_t *journal;
ac27a0ec 4938
bc98a42c 4939 if (sb_rdonly(sb))
9ca92389 4940 return 0;
ac27a0ec 4941
9ca92389 4942 journal = EXT4_SB(sb)->s_journal;
7ffe1ea8 4943
bb044576
TT		 4944 if (journal) {
4945 /* Now we set up the journal barrier. */
4946 jbd2_journal_lock_updates(journal);
ac27a0ec 4947
bb044576
TT		 4948 /*
4949 * Don't clear the needs_recovery flag if we failed to
4950 * flush the journal.
4951 */
4952 error = jbd2_journal_flush(journal);
4953 if (error < 0)
4954 goto out;
c642dc9e
ES		 4955
4956 /* Journal blocked and flushed, clear needs_recovery flag. */
e2b911c5 4957 ext4_clear_feature_journal_needs_recovery(sb);
bb044576 4958 }
9ca92389 4959
9ca92389 4960 error = ext4_commit_super(sb, 1);
6b0310fb 4961out:
bb044576
TT		 4962 if (journal)
4963 /* we rely on upper layer to stop further updates */
4964 jbd2_journal_unlock_updates(journal);
6b0310fb 4965 return error;
ac27a0ec
DK		 4966}
4967
4968/*
4969 * Called by LVM after the snapshot is done. We need to reset the RECOVER
4970 * flag here, even though the filesystem is not technically dirty yet.
4971 */
c4be0c1d 4972static int ext4_unfreeze(struct super_block *sb)
ac27a0ec 4973{
bc98a42c 4974 if (sb_rdonly(sb) || ext4_forced_shutdown(EXT4_SB(sb)))
9ca92389
TT		 4975 return 0;
4976
c642dc9e
ES		 4977 if (EXT4_SB(sb)->s_journal) {
4978 /* Reset the needs_recovery flag before the fs is unlocked. */
e2b911c5 4979 ext4_set_feature_journal_needs_recovery(sb);
c642dc9e
ES		 4980 }
4981
9ca92389 4982 ext4_commit_super(sb, 1);
c4be0c1d 4983 return 0;
ac27a0ec
DK		 4984}
4985
673c6100
TT		 4986/*
4987 * Structure to save mount options for ext4_remount's benefit
4988 */
4989struct ext4_mount_options {
4990 unsigned long s_mount_opt;
a2595b8a 4991 unsigned long s_mount_opt2;
08cefc7a
EB		 4992 kuid_t s_resuid;
4993 kgid_t s_resgid;
673c6100
TT		 4994 unsigned long s_commit_interval;
4995 u32 s_min_batch_time, s_max_batch_time;
4996#ifdef CONFIG_QUOTA
4997 int s_jquota_fmt;
a2d4a646 4998 char *s_qf_names[EXT4_MAXQUOTAS];
673c6100
TT		 4999#endif
5000};
5001
2b2d6d01 5002static int ext4_remount(struct super_block *sb, int *flags, char *data)
ac27a0ec 5003{
2b2d6d01 5004 struct ext4_super_block *es;
617ba13b 5005 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 5006 unsigned long old_sb_flags;
617ba13b 5007 struct ext4_mount_options old_opts;
c79d967d 5008 int enable_quota = 0;
8a266467 5009 ext4_group_t g;
b3881f74 5010 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
c5e06d10 5011 int err = 0;
ac27a0ec 5012#ifdef CONFIG_QUOTA
03dafb5f 5013 int i, j;
ac27a0ec 5014#endif
d4c402d9 5015 char *orig_data = kstrdup(data, GFP_KERNEL);
ac27a0ec
DK		 5016
5017 /* Store the original options */
5018 old_sb_flags = sb->s_flags;
5019 old_opts.s_mount_opt = sbi->s_mount_opt;
a2595b8a 5020 old_opts.s_mount_opt2 = sbi->s_mount_opt2;
ac27a0ec
DK		 5021 old_opts.s_resuid = sbi->s_resuid;
5022 old_opts.s_resgid = sbi->s_resgid;
5023 old_opts.s_commit_interval = sbi->s_commit_interval;
30773840
TT		 5024 old_opts.s_min_batch_time = sbi->s_min_batch_time;
5025 old_opts.s_max_batch_time = sbi->s_max_batch_time;
ac27a0ec
DK		 5026#ifdef CONFIG_QUOTA
5027 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
a2d4a646 5028 for (i = 0; i < EXT4_MAXQUOTAS; i++)
03dafb5f
CG		 5029 if (sbi->s_qf_names[i]) {
5030 old_opts.s_qf_names[i] = kstrdup(sbi->s_qf_names[i],
5031 GFP_KERNEL);
5032 if (!old_opts.s_qf_names[i]) {
5033 for (j = 0; j < i; j++)
5034 kfree(old_opts.s_qf_names[j]);
3e36a163 5035 kfree(orig_data);
03dafb5f
CG		 5036 return -ENOMEM;
5037 }
5038 } else
5039 old_opts.s_qf_names[i] = NULL;
ac27a0ec 5040#endif
b3881f74
TT		 5041 if (sbi->s_journal && sbi->s_journal->j_task->io_context)
5042 journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
ac27a0ec 5043
661aa520 5044 if (!parse_options(data, sb, NULL, &journal_ioprio, 1)) {
ac27a0ec
DK		 5045 err = -EINVAL;
5046 goto restore_opts;
5047 }
5048
6b992ff2 5049 if ((old_opts.s_mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) ^
c6d3d56d
DW		 5050 test_opt(sb, JOURNAL_CHECKSUM)) {
5051 ext4_msg(sb, KERN_ERR, "changing journal_checksum "
2d5b86e0
ES		 5052 "during remount not supported; ignoring");
5053 sbi->s_mount_opt ^= EXT4_MOUNT_JOURNAL_CHECKSUM;
6b992ff2
DW		 5054 }
5055
6ae6514b
PS		 5056 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
5057 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
5058 ext4_msg(sb, KERN_ERR, "can't mount with "
5059 "both data=journal and delalloc");
5060 err = -EINVAL;
5061 goto restore_opts;
5062 }
5063 if (test_opt(sb, DIOREAD_NOLOCK)) {
5064 ext4_msg(sb, KERN_ERR, "can't mount with "
5065 "both data=journal and dioread_nolock");
5066 err = -EINVAL;
5067 goto restore_opts;
5068 }
923ae0ff
RZ		 5069 if (test_opt(sb, DAX)) {
5070 ext4_msg(sb, KERN_ERR, "can't mount with "
5071 "both data=journal and dax");
5072 err = -EINVAL;
5073 goto restore_opts;
5074 }
ab04df78
JK		 5075 } else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) {
5076 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
5077 ext4_msg(sb, KERN_ERR, "can't mount with "
5078 "journal_async_commit in data=ordered mode");
5079 err = -EINVAL;
5080 goto restore_opts;
5081 }
923ae0ff
RZ		 5082 }
5083
cdb7ee4c
TE		 5084 if ((sbi->s_mount_opt ^ old_opts.s_mount_opt) & EXT4_MOUNT_NO_MBCACHE) {
5085 ext4_msg(sb, KERN_ERR, "can't enable nombcache during remount");
5086 err = -EINVAL;
5087 goto restore_opts;
5088 }
5089
923ae0ff
RZ		 5090 if ((sbi->s_mount_opt ^ old_opts.s_mount_opt) & EXT4_MOUNT_DAX) {
5091 ext4_msg(sb, KERN_WARNING, "warning: refusing change of "
5092 "dax flag with busy inodes while remounting");
5093 sbi->s_mount_opt ^= EXT4_MOUNT_DAX;
6ae6514b
PS		 5094 }
5095
4ab2f15b 5096 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
c67d859e 5097 ext4_abort(sb, "Abort forced by user");
ac27a0ec 5098
1751e8a6
LT		 5099 sb->s_flags = (sb->s_flags & ~SB_POSIXACL) |
5100 (test_opt(sb, POSIX_ACL) ? SB_POSIXACL : 0);
ac27a0ec
DK		 5101
5102 es = sbi->s_es;
5103
b3881f74 5104 if (sbi->s_journal) {
0390131b 5105 ext4_init_journal_params(sb, sbi->s_journal);
b3881f74
TT		 5106 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
5107 }
ac27a0ec 5108
1751e8a6
LT		 5109 if (*flags & SB_LAZYTIME)
5110 sb->s_flags |= SB_LAZYTIME;
a2fd66d0 5111
1751e8a6 5112 if ((bool)(*flags & SB_RDONLY) != sb_rdonly(sb)) {
4ab2f15b 5113 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) {
ac27a0ec
DK		 5114 err = -EROFS;
5115 goto restore_opts;
5116 }
5117
1751e8a6 5118 if (*flags & SB_RDONLY) {
38c03b34
TT		 5119 err = sync_filesystem(sb);
5120 if (err < 0)
5121 goto restore_opts;
0f0dd62f
CH		 5122 err = dquot_suspend(sb, -1);
5123 if (err < 0)
c79d967d 5124 goto restore_opts;
c79d967d 5125
ac27a0ec
DK		 5126 /*
5127 * First of all, the unconditional stuff we have to do
5128 * to disable replay of the journal when we next remount
5129 */
1751e8a6 5130 sb->s_flags |= SB_RDONLY;
ac27a0ec
DK		 5131
5132 /*
5133 * OK, test if we are remounting a valid rw partition
5134 * readonly, and if so set the rdonly flag and then
5135 * mark the partition as valid again.
5136 */
617ba13b
MC		 5137 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
5138 (sbi->s_mount_state & EXT4_VALID_FS))
ac27a0ec
DK		 5139 es->s_state = cpu_to_le16(sbi->s_mount_state);
5140
a63c9eb2 5141 if (sbi->s_journal)
0390131b 5142 ext4_mark_recovery_complete(sb, es);
ac27a0ec 5143 } else {
a13fb1a4 5144 /* Make sure we can mount this feature set readwrite */
e2b911c5 5145 if (ext4_has_feature_readonly(sb) ||
2cb5cc8b 5146 !ext4_feature_set_ok(sb, 0)) {
ac27a0ec
DK		 5147 err = -EROFS;
5148 goto restore_opts;
5149 }
8a266467
TT		 5150 /*
5151 * Make sure the group descriptor checksums
0b8e58a1 5152 * are sane. If they aren't, refuse to remount r/w.
8a266467
TT		 5153 */
5154 for (g = 0; g < sbi->s_groups_count; g++) {
5155 struct ext4_group_desc *gdp =
5156 ext4_get_group_desc(sb, g, NULL);
5157
feb0ab32 5158 if (!ext4_group_desc_csum_verify(sb, g, gdp)) {
b31e1552
ES		 5159 ext4_msg(sb, KERN_ERR,
5160 "ext4_remount: Checksum for group %u failed (%u!=%u)",
e2b911c5 5161 g, le16_to_cpu(ext4_group_desc_csum(sb, g, gdp)),
8a266467 5162 le16_to_cpu(gdp->bg_checksum));
6a797d27 5163 err = -EFSBADCRC;
8a266467
TT		 5164 goto restore_opts;
5165 }
5166 }
5167
ead6596b
ES		 5168 /*
5169 * If we have an unprocessed orphan list hanging
5170 * around from a previously readonly bdev mount,
5171 * require a full umount/remount for now.
5172 */
5173 if (es->s_last_orphan) {
b31e1552 5174 ext4_msg(sb, KERN_WARNING, "Couldn't "
ead6596b
ES		 5175 "remount RDWR because of unprocessed "
5176 "orphan inode list. Please "
b31e1552 5177 "umount/remount instead");
ead6596b
ES		 5178 err = -EINVAL;
5179 goto restore_opts;
5180 }
5181
ac27a0ec
DK		 5182 /*
5183 * Mounting a RDONLY partition read-write, so reread
5184 * and store the current valid flag. (It may have
5185 * been changed by e2fsck since we originally mounted
5186 * the partition.)
5187 */
0390131b
FM		 5188 if (sbi->s_journal)
5189 ext4_clear_journal_err(sb, es);
ac27a0ec 5190 sbi->s_mount_state = le16_to_cpu(es->s_state);
c89128a0
JK		 5191
5192 err = ext4_setup_super(sb, es, 0);
5193 if (err)
5194 goto restore_opts;
5195
5196 sb->s_flags &= ~SB_RDONLY;
e2b911c5 5197 if (ext4_has_feature_mmp(sb))
c5e06d10
JL		 5198 if (ext4_multi_mount_protect(sb,
5199 le64_to_cpu(es->s_mmp_block))) {
5200 err = -EROFS;
5201 goto restore_opts;
5202 }
c79d967d 5203 enable_quota = 1;
ac27a0ec
DK		 5204 }
5205 }
bfff6873
LC		 5206
5207 /*
5208 * Reinitialize lazy itable initialization thread based on
5209 * current settings
5210 */
bc98a42c 5211 if (sb_rdonly(sb) || !test_opt(sb, INIT_INODE_TABLE))
bfff6873
LC		 5212 ext4_unregister_li_request(sb);
5213 else {
5214 ext4_group_t first_not_zeroed;
5215 first_not_zeroed = ext4_has_uninit_itable(sb);
5216 ext4_register_li_request(sb, first_not_zeroed);
5217 }
5218
6fd058f7 5219 ext4_setup_system_zone(sb);
c89128a0
JK		 5220 if (sbi->s_journal == NULL && !(old_sb_flags & SB_RDONLY)) {
5221 err = ext4_commit_super(sb, 1);
5222 if (err)
5223 goto restore_opts;
5224 }
0390131b 5225
ac27a0ec
DK		 5226#ifdef CONFIG_QUOTA
5227 /* Release old quota file names */
a2d4a646 5228 for (i = 0; i < EXT4_MAXQUOTAS; i++)
03dafb5f 5229 kfree(old_opts.s_qf_names[i]);
7c319d32
AK		 5230 if (enable_quota) {
5231 if (sb_any_quota_suspended(sb))
5232 dquot_resume(sb, -1);
e2b911c5 5233 else if (ext4_has_feature_quota(sb)) {
7c319d32 5234 err = ext4_enable_quotas(sb);
07724f98 5235 if (err)
7c319d32 5236 goto restore_opts;
7c319d32
AK		 5237 }
5238 }
ac27a0ec 5239#endif
d4c402d9 5240
1751e8a6 5241 *flags = (*flags & ~SB_LAZYTIME) | (sb->s_flags & SB_LAZYTIME);
d4c402d9
CW		 5242 ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s", orig_data);
5243 kfree(orig_data);
ac27a0ec 5244 return 0;
0b8e58a1 5245
ac27a0ec
DK		 5246restore_opts:
5247 sb->s_flags = old_sb_flags;
5248 sbi->s_mount_opt = old_opts.s_mount_opt;
a2595b8a 5249 sbi->s_mount_opt2 = old_opts.s_mount_opt2;
ac27a0ec
DK		 5250 sbi->s_resuid = old_opts.s_resuid;
5251 sbi->s_resgid = old_opts.s_resgid;
5252 sbi->s_commit_interval = old_opts.s_commit_interval;
30773840
TT		 5253 sbi->s_min_batch_time = old_opts.s_min_batch_time;
5254 sbi->s_max_batch_time = old_opts.s_max_batch_time;
ac27a0ec
DK		 5255#ifdef CONFIG_QUOTA
5256 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
a2d4a646 5257 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
03dafb5f 5258 kfree(sbi->s_qf_names[i]);
ac27a0ec
DK		 5259 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
5260 }
5261#endif
d4c402d9 5262 kfree(orig_data);
ac27a0ec
DK		 5263 return err;
5264}
5265
689c958c
LX		 5266#ifdef CONFIG_QUOTA
5267static int ext4_statfs_project(struct super_block *sb,
5268 kprojid_t projid, struct kstatfs *buf)
5269{
5270 struct kqid qid;
5271 struct dquot *dquot;
5272 u64 limit;
5273 u64 curblock;
5274
5275 qid = make_kqid_projid(projid);
5276 dquot = dqget(sb, qid);
5277 if (IS_ERR(dquot))
5278 return PTR_ERR(dquot);
7b9ca4c6 5279 spin_lock(&dquot->dq_dqb_lock);
689c958c
LX		 5280
5281 limit = (dquot->dq_dqb.dqb_bsoftlimit ?
5282 dquot->dq_dqb.dqb_bsoftlimit :
5283 dquot->dq_dqb.dqb_bhardlimit) >> sb->s_blocksize_bits;
5284 if (limit && buf->f_blocks > limit) {
f06925c7
KK		 5285 curblock = (dquot->dq_dqb.dqb_curspace +
5286 dquot->dq_dqb.dqb_rsvspace) >> sb->s_blocksize_bits;
689c958c
LX		 5287 buf->f_blocks = limit;
5288 buf->f_bfree = buf->f_bavail =
5289 (buf->f_blocks > curblock) ?
5290 (buf->f_blocks - curblock) : 0;
5291 }
5292
5293 limit = dquot->dq_dqb.dqb_isoftlimit ?
5294 dquot->dq_dqb.dqb_isoftlimit :
5295 dquot->dq_dqb.dqb_ihardlimit;
5296 if (limit && buf->f_files > limit) {
5297 buf->f_files = limit;
5298 buf->f_ffree =
5299 (buf->f_files > dquot->dq_dqb.dqb_curinodes) ?
5300 (buf->f_files - dquot->dq_dqb.dqb_curinodes) : 0;
5301 }
5302
7b9ca4c6 5303 spin_unlock(&dquot->dq_dqb_lock);
689c958c
LX		 5304 dqput(dquot);
5305 return 0;
5306}
5307#endif
5308
2b2d6d01 5309static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
ac27a0ec
DK		 5310{
5311 struct super_block *sb = dentry->d_sb;
617ba13b
MC		 5312 struct ext4_sb_info *sbi = EXT4_SB(sb);
5313 struct ext4_super_block *es = sbi->s_es;
27dd4385 5314 ext4_fsblk_t overhead = 0, resv_blocks;
960cc398 5315 u64 fsid;
d02a9391 5316 s64 bfree;
27dd4385 5317 resv_blocks = EXT4_C2B(sbi, atomic64_read(&sbi->s_resv_clusters));
ac27a0ec 5318
952fc18e
TT		 5319 if (!test_opt(sb, MINIX_DF))
5320 overhead = sbi->s_overhead;
ac27a0ec 5321
617ba13b 5322 buf->f_type = EXT4_SUPER_MAGIC;
ac27a0ec 5323 buf->f_bsize = sb->s_blocksize;
b72f78cb 5324 buf->f_blocks = ext4_blocks_count(es) - EXT4_C2B(sbi, overhead);
57042651
TT		 5325 bfree = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) -
5326 percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter);
d02a9391 5327 /* prevent underflow in case that few free space is available */
57042651 5328 buf->f_bfree = EXT4_C2B(sbi, max_t(s64, bfree, 0));
27dd4385
LC		 5329 buf->f_bavail = buf->f_bfree -
5330 (ext4_r_blocks_count(es) + resv_blocks);
5331 if (buf->f_bfree < (ext4_r_blocks_count(es) + resv_blocks))
ac27a0ec
DK		 5332 buf->f_bavail = 0;
5333 buf->f_files = le32_to_cpu(es->s_inodes_count);
52d9f3b4 5334 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
617ba13b 5335 buf->f_namelen = EXT4_NAME_LEN;
960cc398
PE		 5336 fsid = le64_to_cpup((void *)es->s_uuid) ^
5337 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
5338 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
5339 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
0b8e58a1 5340
689c958c
LX		 5341#ifdef CONFIG_QUOTA
5342 if (ext4_test_inode_flag(dentry->d_inode, EXT4_INODE_PROJINHERIT) &&
5343 sb_has_quota_limits_enabled(sb, PRJQUOTA))
5344 ext4_statfs_project(sb, EXT4_I(dentry->d_inode)->i_projid, buf);
5345#endif
ac27a0ec
DK		 5346 return 0;
5347}
5348
ac27a0ec
DK		 5349
5350#ifdef CONFIG_QUOTA
5351
bc8230ee
JK		 5352/*
5353 * Helper functions so that transaction is started before we acquire dqio_sem
5354 * to keep correct lock ordering of transaction > dqio_sem
5355 */
ac27a0ec
DK		 5356static inline struct inode *dquot_to_inode(struct dquot *dquot)
5357{
4c376dca 5358 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_id.type];
ac27a0ec
DK		 5359}
5360
617ba13b 5361static int ext4_write_dquot(struct dquot *dquot)
ac27a0ec
DK		 5362{
5363 int ret, err;
5364 handle_t *handle;
5365 struct inode *inode;
5366
5367 inode = dquot_to_inode(dquot);
9924a92a 5368 handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
0b8e58a1 5369 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 5370 if (IS_ERR(handle))
5371 return PTR_ERR(handle);
5372 ret = dquot_commit(dquot);
617ba13b 5373 err = ext4_journal_stop(handle);
ac27a0ec
DK		 5374 if (!ret)
5375 ret = err;
5376 return ret;
5377}
5378
617ba13b 5379static int ext4_acquire_dquot(struct dquot *dquot)
ac27a0ec
DK		 5380{
5381 int ret, err;
5382 handle_t *handle;
5383
9924a92a 5384 handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
0b8e58a1 5385 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 5386 if (IS_ERR(handle))
5387 return PTR_ERR(handle);
5388 ret = dquot_acquire(dquot);
617ba13b 5389 err = ext4_journal_stop(handle);
ac27a0ec
DK		 5390 if (!ret)
5391 ret = err;
5392 return ret;
5393}
5394
617ba13b 5395static int ext4_release_dquot(struct dquot *dquot)
ac27a0ec
DK		 5396{
5397 int ret, err;
5398 handle_t *handle;
5399
9924a92a 5400 handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
0b8e58a1 5401 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
9c3013e9
JK		 5402 if (IS_ERR(handle)) {
5403 /* Release dquot anyway to avoid endless cycle in dqput() */
5404 dquot_release(dquot);
ac27a0ec 5405 return PTR_ERR(handle);
9c3013e9 5406 }
ac27a0ec 5407 ret = dquot_release(dquot);
617ba13b 5408 err = ext4_journal_stop(handle);
ac27a0ec
DK		 5409 if (!ret)
5410 ret = err;
5411 return ret;
5412}
5413
617ba13b 5414static int ext4_mark_dquot_dirty(struct dquot *dquot)
ac27a0ec 5415{
262b4662
JK		 5416 struct super_block *sb = dquot->dq_sb;
5417 struct ext4_sb_info *sbi = EXT4_SB(sb);
5418
2c8be6b2 5419 /* Are we journaling quotas? */
e2b911c5 5420 if (ext4_has_feature_quota(sb) ||
262b4662 5421 sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
ac27a0ec 5422 dquot_mark_dquot_dirty(dquot);
617ba13b 5423 return ext4_write_dquot(dquot);
ac27a0ec
DK		 5424 } else {
5425 return dquot_mark_dquot_dirty(dquot);
5426 }
5427}
5428
617ba13b 5429static int ext4_write_info(struct super_block *sb, int type)
ac27a0ec
DK		 5430{
5431 int ret, err;
5432 handle_t *handle;
5433
5434 /* Data block + inode block */
2b0143b5 5435 handle = ext4_journal_start(d_inode(sb->s_root), EXT4_HT_QUOTA, 2);
ac27a0ec
DK		 5436 if (IS_ERR(handle))
5437 return PTR_ERR(handle);
5438 ret = dquot_commit_info(sb, type);
617ba13b 5439 err = ext4_journal_stop(handle);
ac27a0ec
DK		 5440 if (!ret)
5441 ret = err;
5442 return ret;
5443}
5444
5445/*
5446 * Turn on quotas during mount time - we need to find
5447 * the quota file and such...
5448 */
617ba13b 5449static int ext4_quota_on_mount(struct super_block *sb, int type)
ac27a0ec 5450{
287a8095
CH		 5451 return dquot_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
5452 EXT4_SB(sb)->s_jquota_fmt, type);
ac27a0ec
DK		 5453}
5454
daf647d2
TT		 5455static void lockdep_set_quota_inode(struct inode *inode, int subclass)
5456{
5457 struct ext4_inode_info *ei = EXT4_I(inode);
5458
5459 /* The first argument of lockdep_set_subclass has to be
5460 * *exactly* the same as the argument to init_rwsem() --- in
5461 * this case, in init_once() --- or lockdep gets unhappy
5462 * because the name of the lock is set using the
5463 * stringification of the argument to init_rwsem().
5464 */
5465 (void) ei; /* shut up clang warning if !CONFIG_LOCKDEP */
5466 lockdep_set_subclass(&ei->i_data_sem, subclass);
5467}
5468
ac27a0ec
DK		 5469/*
5470 * Standard function to be called on quota_on
5471 */
617ba13b 5472static int ext4_quota_on(struct super_block *sb, int type, int format_id,
8c54ca9c 5473 const struct path *path)
ac27a0ec
DK		 5474{
5475 int err;
ac27a0ec
DK		 5476
5477 if (!test_opt(sb, QUOTA))
5478 return -EINVAL;
0623543b 5479
ac27a0ec 5480 /* Quotafile not on the same filesystem? */
d8c9584e 5481 if (path->dentry->d_sb != sb)
ac27a0ec 5482 return -EXDEV;
0623543b
JK		 5483 /* Journaling quota? */
5484 if (EXT4_SB(sb)->s_qf_names[type]) {
2b2d6d01 5485 /* Quotafile not in fs root? */
f00c9e44 5486 if (path->dentry->d_parent != sb->s_root)
b31e1552
ES		 5487 ext4_msg(sb, KERN_WARNING,
5488 "Quota file not on filesystem root. "
5489 "Journaled quota will not work");
91389240
JK		 5490 sb_dqopt(sb)->flags |= DQUOT_NOLIST_DIRTY;
5491 } else {
5492 /*
5493 * Clear the flag just in case mount options changed since
5494 * last time.
5495 */
5496 sb_dqopt(sb)->flags &= ~DQUOT_NOLIST_DIRTY;
2b2d6d01 5497 }
0623543b
JK		 5498
5499 /*
5500 * When we journal data on quota file, we have to flush journal to see
5501 * all updates to the file when we bypass pagecache...
5502 */
0390131b 5503 if (EXT4_SB(sb)->s_journal &&
2b0143b5 5504 ext4_should_journal_data(d_inode(path->dentry))) {
0623543b
JK		 5505 /*
5506 * We don't need to lock updates but journal_flush() could
5507 * otherwise be livelocked...
5508 */
5509 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
7ffe1ea8 5510 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
0623543b 5511 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
f00c9e44 5512 if (err)
7ffe1ea8 5513 return err;
0623543b 5514 }
957153fc 5515
daf647d2
TT		 5516 lockdep_set_quota_inode(path->dentry->d_inode, I_DATA_SEM_QUOTA);
5517 err = dquot_quota_on(sb, type, format_id, path);
957153fc 5518 if (err) {
daf647d2
TT		 5519 lockdep_set_quota_inode(path->dentry->d_inode,
5520 I_DATA_SEM_NORMAL);
957153fc
JK		 5521 } else {
5522 struct inode *inode = d_inode(path->dentry);
5523 handle_t *handle;
5524
61a92987
JK		 5525 /*
5526 * Set inode flags to prevent userspace from messing with quota
5527 * files. If this fails, we return success anyway since quotas
5528 * are already enabled and this is not a hard failure.
5529 */
957153fc
JK		 5530 inode_lock(inode);
5531 handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1);
5532 if (IS_ERR(handle))
5533 goto unlock_inode;
5534 EXT4_I(inode)->i_flags |= EXT4_NOATIME_FL | EXT4_IMMUTABLE_FL;
5535 inode_set_flags(inode, S_NOATIME | S_IMMUTABLE,
5536 S_NOATIME | S_IMMUTABLE);
5537 ext4_mark_inode_dirty(handle, inode);
5538 ext4_journal_stop(handle);
5539 unlock_inode:
5540 inode_unlock(inode);
5541 }
daf647d2 5542 return err;
ac27a0ec
DK		 5543}
5544
7c319d32
AK		 5545static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
5546 unsigned int flags)
5547{
5548 int err;
5549 struct inode *qf_inode;
a2d4a646 5550 unsigned long qf_inums[EXT4_MAXQUOTAS] = {
7c319d32 5551 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
689c958c
LX		 5552 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum),
5553 le32_to_cpu(EXT4_SB(sb)->s_es->s_prj_quota_inum)
7c319d32
AK		 5554 };
5555
e2b911c5 5556 BUG_ON(!ext4_has_feature_quota(sb));
7c319d32
AK		 5557
5558 if (!qf_inums[type])
5559 return -EPERM;
5560
5561 qf_inode = ext4_iget(sb, qf_inums[type]);
5562 if (IS_ERR(qf_inode)) {
5563 ext4_error(sb, "Bad quota inode # %lu", qf_inums[type]);
5564 return PTR_ERR(qf_inode);
5565 }
5566
bcb13850
JK		 5567 /* Don't account quota for quota files to avoid recursion */
5568 qf_inode->i_flags |= S_NOQUOTA;
daf647d2 5569 lockdep_set_quota_inode(qf_inode, I_DATA_SEM_QUOTA);
7c319d32
AK		 5570 err = dquot_enable(qf_inode, type, format_id, flags);
5571 iput(qf_inode);
daf647d2
TT		 5572 if (err)
5573 lockdep_set_quota_inode(qf_inode, I_DATA_SEM_NORMAL);
7c319d32
AK		 5574
5575 return err;
5576}
5577
5578/* Enable usage tracking for all quota types. */
5579static int ext4_enable_quotas(struct super_block *sb)
5580{
5581 int type, err = 0;
a2d4a646 5582 unsigned long qf_inums[EXT4_MAXQUOTAS] = {
7c319d32 5583 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
689c958c
LX		 5584 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum),
5585 le32_to_cpu(EXT4_SB(sb)->s_es->s_prj_quota_inum)
7c319d32 5586 };
49da9392
JK		 5587 bool quota_mopt[EXT4_MAXQUOTAS] = {
5588 test_opt(sb, USRQUOTA),
5589 test_opt(sb, GRPQUOTA),
5590 test_opt(sb, PRJQUOTA),
5591 };
7c319d32 5592
91389240 5593 sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE | DQUOT_NOLIST_DIRTY;
a2d4a646 5594 for (type = 0; type < EXT4_MAXQUOTAS; type++) {
7c319d32
AK		 5595 if (qf_inums[type]) {
5596 err = ext4_quota_enable(sb, type, QFMT_VFS_V1,
49da9392
JK		 5597 DQUOT_USAGE_ENABLED |
5598 (quota_mopt[type] ? DQUOT_LIMITS_ENABLED : 0));
7c319d32 5599 if (err) {
95f1fda4 5600 for (type--; type >= 0; type--)
5601 dquot_quota_off(sb, type);
5602
7c319d32 5603 ext4_warning(sb,
72ba7450
TT		 5604 "Failed to enable quota tracking "
5605 "(type=%d, err=%d). Please run "
5606 "e2fsck to fix.", type, err);
7c319d32
AK		 5607 return err;
5608 }
5609 }
5610 }
5611 return 0;
5612}
5613
ca0e05e4
DM		 5614static int ext4_quota_off(struct super_block *sb, int type)
5615{
21f97697
JK		 5616 struct inode *inode = sb_dqopt(sb)->files[type];
5617 handle_t *handle;
957153fc 5618 int err;
21f97697 5619
87009d86
DM		 5620 /* Force all delayed allocation blocks to be allocated.
5621 * Caller already holds s_umount sem */
5622 if (test_opt(sb, DELALLOC))
ca0e05e4 5623 sync_filesystem(sb);
ca0e05e4 5624
957153fc 5625 if (!inode || !igrab(inode))
0b268590
AG		 5626 goto out;
5627
957153fc 5628 err = dquot_quota_off(sb, type);
964edf66 5629 if (err || ext4_has_feature_quota(sb))
957153fc
JK		 5630 goto out_put;
5631
5632 inode_lock(inode);
61a92987
JK		 5633 /*
5634 * Update modification times of quota files when userspace can
5635 * start looking at them. If we fail, we return success anyway since
5636 * this is not a hard failure and quotas are already disabled.
5637 */
9924a92a 5638 handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1);
21f97697 5639 if (IS_ERR(handle))
957153fc
JK		 5640 goto out_unlock;
5641 EXT4_I(inode)->i_flags &= ~(EXT4_NOATIME_FL | EXT4_IMMUTABLE_FL);
5642 inode_set_flags(inode, 0, S_NOATIME | S_IMMUTABLE);
eeca7ea1 5643 inode->i_mtime = inode->i_ctime = current_time(inode);
21f97697
JK		 5644 ext4_mark_inode_dirty(handle, inode);
5645 ext4_journal_stop(handle);
957153fc
JK		 5646out_unlock:
5647 inode_unlock(inode);
5648out_put:
964edf66 5649 lockdep_set_quota_inode(inode, I_DATA_SEM_NORMAL);
957153fc
JK		 5650 iput(inode);
5651 return err;
21f97697 5652out:
ca0e05e4
DM		 5653 return dquot_quota_off(sb, type);
5654}
5655
ac27a0ec
DK		 5656/* Read data from quotafile - avoid pagecache and such because we cannot afford
5657 * acquiring the locks... As quota files are never truncated and quota code
25985edc 5658 * itself serializes the operations (and no one else should touch the files)
ac27a0ec 5659 * we don't have to be afraid of races */
617ba13b 5660static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec
DK		 5661 size_t len, loff_t off)
5662{
5663 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 5664 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 5665 int offset = off & (sb->s_blocksize - 1);
5666 int tocopy;
5667 size_t toread;
5668 struct buffer_head *bh;
5669 loff_t i_size = i_size_read(inode);
5670
5671 if (off > i_size)
5672 return 0;
5673 if (off+len > i_size)
5674 len = i_size-off;
5675 toread = len;
5676 while (toread > 0) {
5677 tocopy = sb->s_blocksize - offset < toread ?
5678 sb->s_blocksize - offset : toread;
1c215028
TT		 5679 bh = ext4_bread(NULL, inode, blk, 0);
5680 if (IS_ERR(bh))
5681 return PTR_ERR(bh);
ac27a0ec
DK		 5682 if (!bh) /* A hole? */
5683 memset(data, 0, tocopy);
5684 else
5685 memcpy(data, bh->b_data+offset, tocopy);
5686 brelse(bh);
5687 offset = 0;
5688 toread -= tocopy;
5689 data += tocopy;
5690 blk++;
5691 }
5692 return len;
5693}
5694
5695/* Write to quotafile (we know the transaction is already started and has
5696 * enough credits) */
617ba13b 5697static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec
DK		 5698 const char *data, size_t len, loff_t off)
5699{
5700 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 5701 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
1c215028 5702 int err, offset = off & (sb->s_blocksize - 1);
c5e298ae 5703 int retries = 0;
ac27a0ec
DK		 5704 struct buffer_head *bh;
5705 handle_t *handle = journal_current_handle();
5706
0390131b 5707 if (EXT4_SB(sb)->s_journal && !handle) {
b31e1552
ES		 5708 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
5709 " cancelled because transaction is not started",
9c3013e9
JK		 5710 (unsigned long long)off, (unsigned long long)len);
5711 return -EIO;
5712 }
67eeb568
DM		 5713 /*
5714 * Since we account only one data block in transaction credits,
5715 * then it is impossible to cross a block boundary.
5716 */
5717 if (sb->s_blocksize - offset < len) {
5718 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
5719 " cancelled because not block aligned",
5720 (unsigned long long)off, (unsigned long long)len);
5721 return -EIO;
5722 }
5723
c5e298ae
TT		 5724 do {
5725 bh = ext4_bread(handle, inode, blk,
5726 EXT4_GET_BLOCKS_CREATE |
5727 EXT4_GET_BLOCKS_METADATA_NOFAIL);
5728 } while (IS_ERR(bh) && (PTR_ERR(bh) == -ENOSPC) &&
5729 ext4_should_retry_alloc(inode->i_sb, &retries));
1c215028
TT		 5730 if (IS_ERR(bh))
5731 return PTR_ERR(bh);
67eeb568
DM		 5732 if (!bh)
5733 goto out;
5d601255 5734 BUFFER_TRACE(bh, "get write access");
62d2b5f2
JK		 5735 err = ext4_journal_get_write_access(handle, bh);
5736 if (err) {
5737 brelse(bh);
1c215028 5738 return err;
ac27a0ec 5739 }
67eeb568
DM		 5740 lock_buffer(bh);
5741 memcpy(bh->b_data+offset, data, len);
5742 flush_dcache_page(bh->b_page);
5743 unlock_buffer(bh);
62d2b5f2 5744 err = ext4_handle_dirty_metadata(handle, NULL, bh);
67eeb568 5745 brelse(bh);
ac27a0ec 5746out:
67eeb568
DM		 5747 if (inode->i_size < off + len) {
5748 i_size_write(inode, off + len);
617ba13b 5749 EXT4_I(inode)->i_disksize = inode->i_size;
21f97697 5750 ext4_mark_inode_dirty(handle, inode);
ac27a0ec 5751 }
67eeb568 5752 return len;
ac27a0ec
DK		 5753}
5754
8f0e8746
TT		 5755static int ext4_get_next_id(struct super_block *sb, struct kqid *qid)
5756{
5757 const struct quota_format_ops *ops;
5758
5759 if (!sb_has_quota_loaded(sb, qid->type))
5760 return -ESRCH;
5761 ops = sb_dqopt(sb)->ops[qid->type];
5762 if (!ops || !ops->get_next_id)
5763 return -ENOSYS;
5764 return dquot_get_next_id(sb, qid);
5765}
ac27a0ec
DK		 5766#endif
5767
152a0836
AV		 5768static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
5769 const char *dev_name, void *data)
ac27a0ec 5770{
152a0836 5771 return mount_bdev(fs_type, flags, dev_name, data, ext4_fill_super);
ac27a0ec
DK		 5772}
5773
c290ea01 5774#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2)
24b58424
TT		 5775static inline void register_as_ext2(void)
5776{
5777 int err = register_filesystem(&ext2_fs_type);
5778 if (err)
5779 printk(KERN_WARNING
5780 "EXT4-fs: Unable to register as ext2 (%d)\n", err);
5781}
5782
5783static inline void unregister_as_ext2(void)
5784{
5785 unregister_filesystem(&ext2_fs_type);
5786}
2035e776
TT		 5787
5788static inline int ext2_feature_set_ok(struct super_block *sb)
5789{
e2b911c5 5790 if (ext4_has_unknown_ext2_incompat_features(sb))
2035e776 5791 return 0;
bc98a42c 5792 if (sb_rdonly(sb))
2035e776 5793 return 1;
e2b911c5 5794 if (ext4_has_unknown_ext2_ro_compat_features(sb))
2035e776
TT		 5795 return 0;
5796 return 1;
5797}
24b58424
TT		 5798#else
5799static inline void register_as_ext2(void) { }
5800static inline void unregister_as_ext2(void) { }
2035e776 5801static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; }
24b58424
TT		 5802#endif
5803
24b58424
TT		 5804static inline void register_as_ext3(void)
5805{
5806 int err = register_filesystem(&ext3_fs_type);
5807 if (err)
5808 printk(KERN_WARNING
5809 "EXT4-fs: Unable to register as ext3 (%d)\n", err);
5810}
5811
5812static inline void unregister_as_ext3(void)
5813{
5814 unregister_filesystem(&ext3_fs_type);
5815}
2035e776
TT		 5816
5817static inline int ext3_feature_set_ok(struct super_block *sb)
5818{
e2b911c5 5819 if (ext4_has_unknown_ext3_incompat_features(sb))
2035e776 5820 return 0;
e2b911c5 5821 if (!ext4_has_feature_journal(sb))
2035e776 5822 return 0;
bc98a42c 5823 if (sb_rdonly(sb))
2035e776 5824 return 1;
e2b911c5 5825 if (ext4_has_unknown_ext3_ro_compat_features(sb))
2035e776
TT		 5826 return 0;
5827 return 1;
5828}
24b58424 5829
03010a33
TT		 5830static struct file_system_type ext4_fs_type = {
5831 .owner = THIS_MODULE,
5832 .name = "ext4",
152a0836 5833 .mount = ext4_mount,
03010a33
TT		 5834 .kill_sb = kill_block_super,
5835 .fs_flags = FS_REQUIRES_DEV,
5836};
7f78e035 5837MODULE_ALIAS_FS("ext4");
03010a33 5838
e9e3bcec
ES		 5839/* Shared across all ext4 file systems */
5840wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
e9e3bcec 5841
5dabfc78 5842static int __init ext4_init_fs(void)
ac27a0ec 5843{
e9e3bcec 5844 int i, err;
c9de560d 5845
e294a537 5846 ratelimit_state_init(&ext4_mount_msg_ratelimit, 30 * HZ, 64);
07c0c5d8
AV		 5847 ext4_li_info = NULL;
5848 mutex_init(&ext4_li_mtx);
5849
9a4c8019 5850 /* Build-time check for flags consistency */
12e9b892 5851 ext4_check_flag_values();
e9e3bcec 5852
e142d052 5853 for (i = 0; i < EXT4_WQ_HASH_SZ; i++)
e9e3bcec 5854 init_waitqueue_head(&ext4__ioend_wq[i]);
e9e3bcec 5855
51865fda 5856 err = ext4_init_es();
6fd058f7
TT		 5857 if (err)
5858 return err;
51865fda
ZL		 5859
5860 err = ext4_init_pageio();
5861 if (err)
b5799018 5862 goto out5;
51865fda 5863
5dabfc78 5864 err = ext4_init_system_zone();
bd2d0210 5865 if (err)
b5799018 5866 goto out4;
857ac889 5867
b5799018 5868 err = ext4_init_sysfs();
dd68314c 5869 if (err)
b5799018 5870 goto out3;
857ac889 5871
5dabfc78 5872 err = ext4_init_mballoc();
c9de560d
AT		 5873 if (err)
5874 goto out2;
ac27a0ec
DK		 5875 err = init_inodecache();
5876 if (err)
5877 goto out1;
24b58424 5878 register_as_ext3();
2035e776 5879 register_as_ext2();
03010a33 5880 err = register_filesystem(&ext4_fs_type);
ac27a0ec
DK		 5881 if (err)
5882 goto out;
bfff6873 5883
ac27a0ec
DK		 5884 return 0;
5885out:
24b58424
TT		 5886 unregister_as_ext2();
5887 unregister_as_ext3();
ac27a0ec
DK		 5888 destroy_inodecache();
5889out1:
5dabfc78 5890 ext4_exit_mballoc();
9c191f70 5891out2:
b5799018
TT		 5892 ext4_exit_sysfs();
5893out3:
5dabfc78 5894 ext4_exit_system_zone();
b5799018 5895out4:
5dabfc78 5896 ext4_exit_pageio();
b5799018 5897out5:
51865fda
ZL		 5898 ext4_exit_es();
5899
ac27a0ec
DK		 5900 return err;
5901}
5902
5dabfc78 5903static void __exit ext4_exit_fs(void)
ac27a0ec 5904{
bfff6873 5905 ext4_destroy_lazyinit_thread();
24b58424
TT		 5906 unregister_as_ext2();
5907 unregister_as_ext3();
03010a33 5908 unregister_filesystem(&ext4_fs_type);
ac27a0ec 5909 destroy_inodecache();
5dabfc78 5910 ext4_exit_mballoc();
b5799018 5911 ext4_exit_sysfs();
5dabfc78
TT		 5912 ext4_exit_system_zone();
5913 ext4_exit_pageio();
dd12ed14 5914 ext4_exit_es();
ac27a0ec
DK		 5915}
5916
5917MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
83982b6f 5918MODULE_DESCRIPTION("Fourth Extended Filesystem");
ac27a0ec 5919MODULE_LICENSE("GPL");
7ef79ad5 5920MODULE_SOFTDEP("pre: crc32c");
5dabfc78
TT		 5921module_init(ext4_init_fs)
5922module_exit(ext4_exit_fs)
Linux 6.x block layer and io_uring tree(s)