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quota: Forbid Q_GETQUOTA and Q_GETNEXTQUOTA for frozen filesystem
[GitHub/LineageOS/android_kernel_motorola_exynos9610.git] / fs / ext4 / super.c
CommitLineData
ac27a0ec 1/*
617ba13b 2 * linux/fs/ext4/super.c
ac27a0ec
DK		 3 *
4 * Copyright (C) 1992, 1993, 1994, 1995
5 * Remy Card (card@masi.ibp.fr)
6 * Laboratoire MASI - Institut Blaise Pascal
7 * Universite Pierre et Marie Curie (Paris VI)
8 *
9 * from
10 *
11 * linux/fs/minix/inode.c
12 *
13 * Copyright (C) 1991, 1992 Linus Torvalds
14 *
15 * Big-endian to little-endian byte-swapping/bitmaps by
16 * David S. Miller (davem@caip.rutgers.edu), 1995
17 */
18
19#include <linux/module.h>
20#include <linux/string.h>
21#include <linux/fs.h>
22#include <linux/time.h>
c5ca7c76 23#include <linux/vmalloc.h>
ac27a0ec
DK		 24#include <linux/slab.h>
25#include <linux/init.h>
26#include <linux/blkdev.h>
66114cad 27#include <linux/backing-dev.h>
ac27a0ec 28#include <linux/parser.h>
ac27a0ec 29#include <linux/buffer_head.h>
a5694255 30#include <linux/exportfs.h>
ac27a0ec
DK		 31#include <linux/vfs.h>
32#include <linux/random.h>
33#include <linux/mount.h>
34#include <linux/namei.h>
35#include <linux/quotaops.h>
36#include <linux/seq_file.h>
3197ebdb 37#include <linux/ctype.h>
1330593e 38#include <linux/log2.h>
717d50e4 39#include <linux/crc16.h>
7abc52c2 40#include <linux/cleancache.h>
ac27a0ec
DK		 41#include <asm/uaccess.h>
42
bfff6873
LC		 43#include <linux/kthread.h>
44#include <linux/freezer.h>
45
3dcf5451 46#include "ext4.h"
4a092d73 47#include "ext4_extents.h" /* Needed for trace points definition */
3dcf5451 48#include "ext4_jbd2.h"
ac27a0ec
DK		 49#include "xattr.h"
50#include "acl.h"
3661d286 51#include "mballoc.h"
ac27a0ec 52
9bffad1e
TT		 53#define CREATE_TRACE_POINTS
54#include <trace/events/ext4.h>
55
0b75a840
LC		 56static struct ext4_lazy_init *ext4_li_info;
57static struct mutex ext4_li_mtx;
9c191f70 58static int ext4_mballoc_ready;
e294a537 59static struct ratelimit_state ext4_mount_msg_ratelimit;
9f6200bb 60
617ba13b 61static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
ac27a0ec 62 unsigned long journal_devnum);
2adf6da8 63static int ext4_show_options(struct seq_file *seq, struct dentry *root);
e2d67052 64static int ext4_commit_super(struct super_block *sb, int sync);
2b2d6d01
TT		 65static void ext4_mark_recovery_complete(struct super_block *sb,
66 struct ext4_super_block *es);
67static void ext4_clear_journal_err(struct super_block *sb,
68 struct ext4_super_block *es);
617ba13b 69static int ext4_sync_fs(struct super_block *sb, int wait);
2b2d6d01
TT		 70static int ext4_remount(struct super_block *sb, int *flags, char *data);
71static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
c4be0c1d 72static int ext4_unfreeze(struct super_block *sb);
c4be0c1d 73static int ext4_freeze(struct super_block *sb);
152a0836
AV		 74static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
75 const char *dev_name, void *data);
2035e776
TT		 76static inline int ext2_feature_set_ok(struct super_block *sb);
77static inline int ext3_feature_set_ok(struct super_block *sb);
d39195c3 78static int ext4_feature_set_ok(struct super_block *sb, int readonly);
bfff6873
LC		 79static void ext4_destroy_lazyinit_thread(void);
80static void ext4_unregister_li_request(struct super_block *sb);
8f1f7453 81static void ext4_clear_request_list(void);
ac27a0ec 82
e74031fd
JK		 83/*
84 * Lock ordering
85 *
86 * Note the difference between i_mmap_sem (EXT4_I(inode)->i_mmap_sem) and
87 * i_mmap_rwsem (inode->i_mmap_rwsem)!
88 *
89 * page fault path:
90 * mmap_sem -> sb_start_pagefault -> i_mmap_sem (r) -> transaction start ->
91 * page lock -> i_data_sem (rw)
92 *
93 * buffered write path:
94 * sb_start_write -> i_mutex -> mmap_sem
95 * sb_start_write -> i_mutex -> transaction start -> page lock ->
96 * i_data_sem (rw)
97 *
98 * truncate:
99 * sb_start_write -> i_mutex -> EXT4_STATE_DIOREAD_LOCK (w) -> i_mmap_sem (w) ->
100 * i_mmap_rwsem (w) -> page lock
101 * sb_start_write -> i_mutex -> EXT4_STATE_DIOREAD_LOCK (w) -> i_mmap_sem (w) ->
102 * transaction start -> i_data_sem (rw)
103 *
104 * direct IO:
105 * sb_start_write -> i_mutex -> EXT4_STATE_DIOREAD_LOCK (r) -> mmap_sem
106 * sb_start_write -> i_mutex -> EXT4_STATE_DIOREAD_LOCK (r) ->
107 * transaction start -> i_data_sem (rw)
108 *
109 * writepages:
110 * transaction start -> page lock(s) -> i_data_sem (rw)
111 */
112
c290ea01 113#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2)
2035e776
TT		 114static struct file_system_type ext2_fs_type = {
115 .owner = THIS_MODULE,
116 .name = "ext2",
117 .mount = ext4_mount,
118 .kill_sb = kill_block_super,
119 .fs_flags = FS_REQUIRES_DEV,
120};
7f78e035 121MODULE_ALIAS_FS("ext2");
fa7614dd 122MODULE_ALIAS("ext2");
2035e776
TT		 123#define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type)
124#else
125#define IS_EXT2_SB(sb) (0)
126#endif
127
128
ba69f9ab
JK		 129static struct file_system_type ext3_fs_type = {
130 .owner = THIS_MODULE,
131 .name = "ext3",
152a0836 132 .mount = ext4_mount,
ba69f9ab
JK		 133 .kill_sb = kill_block_super,
134 .fs_flags = FS_REQUIRES_DEV,
135};
7f78e035 136MODULE_ALIAS_FS("ext3");
fa7614dd 137MODULE_ALIAS("ext3");
ba69f9ab 138#define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type)
bd81d8ee 139
d25425f8
DW		 140static int ext4_verify_csum_type(struct super_block *sb,
141 struct ext4_super_block *es)
142{
e2b911c5 143 if (!ext4_has_feature_metadata_csum(sb))
d25425f8
DW		 144 return 1;
145
146 return es->s_checksum_type == EXT4_CRC32C_CHKSUM;
147}
148
a9c47317
DW		 149static __le32 ext4_superblock_csum(struct super_block *sb,
150 struct ext4_super_block *es)
151{
152 struct ext4_sb_info *sbi = EXT4_SB(sb);
153 int offset = offsetof(struct ext4_super_block, s_checksum);
154 __u32 csum;
155
156 csum = ext4_chksum(sbi, ~0, (char *)es, offset);
157
158 return cpu_to_le32(csum);
159}
160
c197855e
SH		 161static int ext4_superblock_csum_verify(struct super_block *sb,
162 struct ext4_super_block *es)
a9c47317 163{
9aa5d32b 164 if (!ext4_has_metadata_csum(sb))
a9c47317
DW		 165 return 1;
166
167 return es->s_checksum == ext4_superblock_csum(sb, es);
168}
169
06db49e6 170void ext4_superblock_csum_set(struct super_block *sb)
a9c47317 171{
06db49e6
TT		 172 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
173
9aa5d32b 174 if (!ext4_has_metadata_csum(sb))
a9c47317
DW		 175 return;
176
177 es->s_checksum = ext4_superblock_csum(sb, es);
178}
179
9933fc0a
TT		 180void *ext4_kvmalloc(size_t size, gfp_t flags)
181{
182 void *ret;
183
8be04b93 184 ret = kmalloc(size, flags | __GFP_NOWARN);
9933fc0a
TT		 185 if (!ret)
186 ret = __vmalloc(size, flags, PAGE_KERNEL);
187 return ret;
188}
189
190void *ext4_kvzalloc(size_t size, gfp_t flags)
191{
192 void *ret;
193
8be04b93 194 ret = kzalloc(size, flags | __GFP_NOWARN);
9933fc0a
TT		 195 if (!ret)
196 ret = __vmalloc(size, flags | __GFP_ZERO, PAGE_KERNEL);
197 return ret;
198}
199
8fadc143
AR		 200ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
201 struct ext4_group_desc *bg)
bd81d8ee 202{
3a14589c 203 return le32_to_cpu(bg->bg_block_bitmap_lo) |
8fadc143 204 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 205 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 206}
207
8fadc143
AR		 208ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
209 struct ext4_group_desc *bg)
bd81d8ee 210{
5272f837 211 return le32_to_cpu(bg->bg_inode_bitmap_lo) |
8fadc143 212 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 213 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 214}
215
8fadc143
AR		 216ext4_fsblk_t ext4_inode_table(struct super_block *sb,
217 struct ext4_group_desc *bg)
bd81d8ee 218{
5272f837 219 return le32_to_cpu(bg->bg_inode_table_lo) |
8fadc143 220 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 221 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
bd81d8ee
LV		 222}
223
021b65bb
TT		 224__u32 ext4_free_group_clusters(struct super_block *sb,
225 struct ext4_group_desc *bg)
560671a0
AK		 226{
227 return le16_to_cpu(bg->bg_free_blocks_count_lo) |
228 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 229 (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0);
560671a0
AK		 230}
231
232__u32 ext4_free_inodes_count(struct super_block *sb,
233 struct ext4_group_desc *bg)
234{
235 return le16_to_cpu(bg->bg_free_inodes_count_lo) |
236 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 237 (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0);
560671a0
AK		 238}
239
240__u32 ext4_used_dirs_count(struct super_block *sb,
241 struct ext4_group_desc *bg)
242{
243 return le16_to_cpu(bg->bg_used_dirs_count_lo) |
244 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 245 (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0);
560671a0
AK		 246}
247
248__u32 ext4_itable_unused_count(struct super_block *sb,
249 struct ext4_group_desc *bg)
250{
251 return le16_to_cpu(bg->bg_itable_unused_lo) |
252 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 253 (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0);
560671a0
AK		 254}
255
8fadc143
AR		 256void ext4_block_bitmap_set(struct super_block *sb,
257 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 258{
3a14589c 259 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 260 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
261 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 262}
263
8fadc143
AR		 264void ext4_inode_bitmap_set(struct super_block *sb,
265 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 266{
5272f837 267 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 268 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
269 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 270}
271
8fadc143
AR		 272void ext4_inode_table_set(struct super_block *sb,
273 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 274{
5272f837 275 bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 276 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
277 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 278}
279
021b65bb
TT		 280void ext4_free_group_clusters_set(struct super_block *sb,
281 struct ext4_group_desc *bg, __u32 count)
560671a0
AK		 282{
283 bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count);
284 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
285 bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16);
286}
287
288void ext4_free_inodes_set(struct super_block *sb,
289 struct ext4_group_desc *bg, __u32 count)
290{
291 bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count);
292 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
293 bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16);
294}
295
296void ext4_used_dirs_set(struct super_block *sb,
297 struct ext4_group_desc *bg, __u32 count)
298{
299 bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count);
300 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
301 bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16);
302}
303
304void ext4_itable_unused_set(struct super_block *sb,
305 struct ext4_group_desc *bg, __u32 count)
306{
307 bg->bg_itable_unused_lo = cpu_to_le16((__u16)count);
308 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
309 bg->bg_itable_unused_hi = cpu_to_le16(count >> 16);
310}
311
d3d1faf6 312
1c13d5c0
TT		 313static void __save_error_info(struct super_block *sb, const char *func,
314 unsigned int line)
315{
316 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
317
318 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
1b46617b
TT		 319 if (bdev_read_only(sb->s_bdev))
320 return;
1c13d5c0
TT		 321 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
322 es->s_last_error_time = cpu_to_le32(get_seconds());
323 strncpy(es->s_last_error_func, func, sizeof(es->s_last_error_func));
324 es->s_last_error_line = cpu_to_le32(line);
325 if (!es->s_first_error_time) {
326 es->s_first_error_time = es->s_last_error_time;
327 strncpy(es->s_first_error_func, func,
328 sizeof(es->s_first_error_func));
329 es->s_first_error_line = cpu_to_le32(line);
330 es->s_first_error_ino = es->s_last_error_ino;
331 es->s_first_error_block = es->s_last_error_block;
332 }
66e61a9e
TT		 333 /*
334 * Start the daily error reporting function if it hasn't been
335 * started already
336 */
337 if (!es->s_error_count)
338 mod_timer(&EXT4_SB(sb)->s_err_report, jiffies + 24*60*60*HZ);
ba39ebb6 339 le32_add_cpu(&es->s_error_count, 1);
1c13d5c0
TT		 340}
341
342static void save_error_info(struct super_block *sb, const char *func,
343 unsigned int line)
344{
345 __save_error_info(sb, func, line);
346 ext4_commit_super(sb, 1);
347}
348
bdfe0cbd
TT		 349/*
350 * The del_gendisk() function uninitializes the disk-specific data
351 * structures, including the bdi structure, without telling anyone
352 * else. Once this happens, any attempt to call mark_buffer_dirty()
353 * (for example, by ext4_commit_super), will cause a kernel OOPS.
354 * This is a kludge to prevent these oops until we can put in a proper
355 * hook in del_gendisk() to inform the VFS and file system layers.
356 */
357static int block_device_ejected(struct super_block *sb)
358{
359 struct inode *bd_inode = sb->s_bdev->bd_inode;
360 struct backing_dev_info *bdi = inode_to_bdi(bd_inode);
361
362 return bdi->dev == NULL;
363}
364
18aadd47
BJ		 365static void ext4_journal_commit_callback(journal_t *journal, transaction_t *txn)
366{
367 struct super_block *sb = journal->j_private;
368 struct ext4_sb_info *sbi = EXT4_SB(sb);
369 int error = is_journal_aborted(journal);
5d3ee208 370 struct ext4_journal_cb_entry *jce;
18aadd47 371
5d3ee208 372 BUG_ON(txn->t_state == T_FINISHED);
18aadd47 373 spin_lock(&sbi->s_md_lock);
5d3ee208
DM		 374 while (!list_empty(&txn->t_private_list)) {
375 jce = list_entry(txn->t_private_list.next,
376 struct ext4_journal_cb_entry, jce_list);
18aadd47
BJ		 377 list_del_init(&jce->jce_list);
378 spin_unlock(&sbi->s_md_lock);
379 jce->jce_func(sb, jce, error);
380 spin_lock(&sbi->s_md_lock);
381 }
382 spin_unlock(&sbi->s_md_lock);
383}
1c13d5c0 384
ac27a0ec
DK		 385/* Deal with the reporting of failure conditions on a filesystem such as
386 * inconsistencies detected or read IO failures.
387 *
388 * On ext2, we can store the error state of the filesystem in the
617ba13b 389 * superblock. That is not possible on ext4, because we may have other
ac27a0ec
DK		 390 * write ordering constraints on the superblock which prevent us from
391 * writing it out straight away; and given that the journal is about to
392 * be aborted, we can't rely on the current, or future, transactions to
393 * write out the superblock safely.
394 *
dab291af 395 * We'll just use the jbd2_journal_abort() error code to record an error in
d6b198bc 396 * the journal instead. On recovery, the journal will complain about
ac27a0ec
DK		 397 * that error until we've noted it down and cleared it.
398 */
399
617ba13b 400static void ext4_handle_error(struct super_block *sb)
ac27a0ec 401{
ac27a0ec
DK		 402 if (sb->s_flags & MS_RDONLY)
403 return;
404
2b2d6d01 405 if (!test_opt(sb, ERRORS_CONT)) {
617ba13b 406 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 407
4ab2f15b 408 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
ac27a0ec 409 if (journal)
dab291af 410 jbd2_journal_abort(journal, -EIO);
ac27a0ec 411 }
2b2d6d01 412 if (test_opt(sb, ERRORS_RO)) {
b31e1552 413 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
4418e141
DM		 414 /*
415 * Make sure updated value of ->s_mount_flags will be visible
416 * before ->s_flags update
417 */
418 smp_wmb();
ac27a0ec
DK		 419 sb->s_flags |= MS_RDONLY;
420 }
4327ba52
DJ		 421 if (test_opt(sb, ERRORS_PANIC)) {
422 if (EXT4_SB(sb)->s_journal &&
423 !(EXT4_SB(sb)->s_journal->j_flags & JBD2_REC_ERR))
424 return;
617ba13b 425 panic("EXT4-fs (device %s): panic forced after error\n",
ac27a0ec 426 sb->s_id);
4327ba52 427 }
ac27a0ec
DK		 428}
429
efbed4dc
TT		 430#define ext4_error_ratelimit(sb) \
431 ___ratelimit(&(EXT4_SB(sb)->s_err_ratelimit_state), \
432 "EXT4-fs error")
433
12062ddd 434void __ext4_error(struct super_block *sb, const char *function,
c398eda0 435 unsigned int line, const char *fmt, ...)
ac27a0ec 436{
0ff2ea7d 437 struct va_format vaf;
ac27a0ec
DK		 438 va_list args;
439
efbed4dc
TT		 440 if (ext4_error_ratelimit(sb)) {
441 va_start(args, fmt);
442 vaf.fmt = fmt;
443 vaf.va = &args;
444 printk(KERN_CRIT
445 "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n",
446 sb->s_id, function, line, current->comm, &vaf);
447 va_end(args);
448 }
f3fc0210 449 save_error_info(sb, function, line);
617ba13b 450 ext4_handle_error(sb);
ac27a0ec
DK		 451}
452
e7c96e8e
JP		 453void __ext4_error_inode(struct inode *inode, const char *function,
454 unsigned int line, ext4_fsblk_t block,
455 const char *fmt, ...)
273df556
FM		 456{
457 va_list args;
f7c21177 458 struct va_format vaf;
1c13d5c0 459 struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
273df556 460
1c13d5c0
TT		 461 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
462 es->s_last_error_block = cpu_to_le64(block);
efbed4dc
TT		 463 if (ext4_error_ratelimit(inode->i_sb)) {
464 va_start(args, fmt);
465 vaf.fmt = fmt;
466 vaf.va = &args;
467 if (block)
468 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
469 "inode #%lu: block %llu: comm %s: %pV\n",
470 inode->i_sb->s_id, function, line, inode->i_ino,
471 block, current->comm, &vaf);
472 else
473 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
474 "inode #%lu: comm %s: %pV\n",
475 inode->i_sb->s_id, function, line, inode->i_ino,
476 current->comm, &vaf);
477 va_end(args);
478 }
1c13d5c0 479 save_error_info(inode->i_sb, function, line);
273df556
FM		 480 ext4_handle_error(inode->i_sb);
481}
482
e7c96e8e
JP		 483void __ext4_error_file(struct file *file, const char *function,
484 unsigned int line, ext4_fsblk_t block,
485 const char *fmt, ...)
273df556
FM		 486{
487 va_list args;
f7c21177 488 struct va_format vaf;
1c13d5c0 489 struct ext4_super_block *es;
496ad9aa 490 struct inode *inode = file_inode(file);
273df556
FM		 491 char pathname[80], *path;
492
1c13d5c0
TT		 493 es = EXT4_SB(inode->i_sb)->s_es;
494 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
efbed4dc 495 if (ext4_error_ratelimit(inode->i_sb)) {
9bf39ab2 496 path = file_path(file, pathname, sizeof(pathname));
efbed4dc
TT		 497 if (IS_ERR(path))
498 path = "(unknown)";
499 va_start(args, fmt);
500 vaf.fmt = fmt;
501 vaf.va = &args;
502 if (block)
503 printk(KERN_CRIT
504 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
505 "block %llu: comm %s: path %s: %pV\n",
506 inode->i_sb->s_id, function, line, inode->i_ino,
507 block, current->comm, path, &vaf);
508 else
509 printk(KERN_CRIT
510 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
511 "comm %s: path %s: %pV\n",
512 inode->i_sb->s_id, function, line, inode->i_ino,
513 current->comm, path, &vaf);
514 va_end(args);
515 }
1c13d5c0 516 save_error_info(inode->i_sb, function, line);
273df556
FM		 517 ext4_handle_error(inode->i_sb);
518}
519
722887dd
TT		 520const char *ext4_decode_error(struct super_block *sb, int errno,
521 char nbuf[16])
ac27a0ec
DK		 522{
523 char *errstr = NULL;
524
525 switch (errno) {
6a797d27
DW		 526 case -EFSCORRUPTED:
527 errstr = "Corrupt filesystem";
528 break;
529 case -EFSBADCRC:
530 errstr = "Filesystem failed CRC";
531 break;
ac27a0ec
DK		 532 case -EIO:
533 errstr = "IO failure";
534 break;
535 case -ENOMEM:
536 errstr = "Out of memory";
537 break;
538 case -EROFS:
78f1ddbb
TT		 539 if (!sb || (EXT4_SB(sb)->s_journal &&
540 EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT))
ac27a0ec
DK		 541 errstr = "Journal has aborted";
542 else
543 errstr = "Readonly filesystem";
544 break;
545 default:
546 /* If the caller passed in an extra buffer for unknown
547 * errors, textualise them now. Else we just return
548 * NULL. */
549 if (nbuf) {
550 /* Check for truncated error codes... */
551 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
552 errstr = nbuf;
553 }
554 break;
555 }
556
557 return errstr;
558}
559
617ba13b 560/* __ext4_std_error decodes expected errors from journaling functions
ac27a0ec
DK		 561 * automatically and invokes the appropriate error response. */
562
c398eda0
TT		 563void __ext4_std_error(struct super_block *sb, const char *function,
564 unsigned int line, int errno)
ac27a0ec
DK		 565{
566 char nbuf[16];
567 const char *errstr;
568
569 /* Special case: if the error is EROFS, and we're not already
570 * inside a transaction, then there's really no point in logging
571 * an error. */
572 if (errno == -EROFS && journal_current_handle() == NULL &&
573 (sb->s_flags & MS_RDONLY))
574 return;
575
efbed4dc
TT		 576 if (ext4_error_ratelimit(sb)) {
577 errstr = ext4_decode_error(sb, errno, nbuf);
578 printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n",
579 sb->s_id, function, line, errstr);
580 }
ac27a0ec 581
efbed4dc 582 save_error_info(sb, function, line);
617ba13b 583 ext4_handle_error(sb);
ac27a0ec
DK		 584}
585
586/*
617ba13b 587 * ext4_abort is a much stronger failure handler than ext4_error. The
ac27a0ec
DK		 588 * abort function may be used to deal with unrecoverable failures such
589 * as journal IO errors or ENOMEM at a critical moment in log management.
590 *
591 * We unconditionally force the filesystem into an ABORT|READONLY state,
592 * unless the error response on the fs has been set to panic in which
593 * case we take the easy way out and panic immediately.
594 */
595
c67d859e 596void __ext4_abort(struct super_block *sb, const char *function,
c398eda0 597 unsigned int line, const char *fmt, ...)
ac27a0ec
DK		 598{
599 va_list args;
600
1c13d5c0 601 save_error_info(sb, function, line);
ac27a0ec 602 va_start(args, fmt);
c398eda0
TT		 603 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: ", sb->s_id,
604 function, line);
ac27a0ec
DK		 605 vprintk(fmt, args);
606 printk("\n");
607 va_end(args);
608
1c13d5c0
TT		 609 if ((sb->s_flags & MS_RDONLY) == 0) {
610 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
1c13d5c0 611 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
4418e141
DM		 612 /*
613 * Make sure updated value of ->s_mount_flags will be visible
614 * before ->s_flags update
615 */
616 smp_wmb();
617 sb->s_flags |= MS_RDONLY;
1c13d5c0
TT		 618 if (EXT4_SB(sb)->s_journal)
619 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
620 save_error_info(sb, function, line);
621 }
4327ba52
DJ		 622 if (test_opt(sb, ERRORS_PANIC)) {
623 if (EXT4_SB(sb)->s_journal &&
624 !(EXT4_SB(sb)->s_journal->j_flags & JBD2_REC_ERR))
625 return;
617ba13b 626 panic("EXT4-fs panic from previous error\n");
4327ba52 627 }
ac27a0ec
DK		 628}
629
e7c96e8e
JP		 630void __ext4_msg(struct super_block *sb,
631 const char *prefix, const char *fmt, ...)
b31e1552 632{
0ff2ea7d 633 struct va_format vaf;
b31e1552
ES		 634 va_list args;
635
efbed4dc
TT		 636 if (!___ratelimit(&(EXT4_SB(sb)->s_msg_ratelimit_state), "EXT4-fs"))
637 return;
638
b31e1552 639 va_start(args, fmt);
0ff2ea7d
JP		 640 vaf.fmt = fmt;
641 vaf.va = &args;
642 printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
b31e1552
ES		 643 va_end(args);
644}
645
b03a2f7e
AD		 646#define ext4_warning_ratelimit(sb) \
647 ___ratelimit(&(EXT4_SB(sb)->s_warning_ratelimit_state), \
648 "EXT4-fs warning")
649
12062ddd 650void __ext4_warning(struct super_block *sb, const char *function,
c398eda0 651 unsigned int line, const char *fmt, ...)
ac27a0ec 652{
0ff2ea7d 653 struct va_format vaf;
ac27a0ec
DK		 654 va_list args;
655
b03a2f7e 656 if (!ext4_warning_ratelimit(sb))
efbed4dc
TT		 657 return;
658
ac27a0ec 659 va_start(args, fmt);
0ff2ea7d
JP		 660 vaf.fmt = fmt;
661 vaf.va = &args;
662 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: %pV\n",
663 sb->s_id, function, line, &vaf);
ac27a0ec
DK		 664 va_end(args);
665}
666
b03a2f7e
AD		 667void __ext4_warning_inode(const struct inode *inode, const char *function,
668 unsigned int line, const char *fmt, ...)
669{
670 struct va_format vaf;
671 va_list args;
672
673 if (!ext4_warning_ratelimit(inode->i_sb))
674 return;
675
676 va_start(args, fmt);
677 vaf.fmt = fmt;
678 vaf.va = &args;
679 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: "
680 "inode #%lu: comm %s: %pV\n", inode->i_sb->s_id,
681 function, line, inode->i_ino, current->comm, &vaf);
682 va_end(args);
683}
684
e29136f8
TT		 685void __ext4_grp_locked_error(const char *function, unsigned int line,
686 struct super_block *sb, ext4_group_t grp,
687 unsigned long ino, ext4_fsblk_t block,
688 const char *fmt, ...)
5d1b1b3f
AK		 689__releases(bitlock)
690__acquires(bitlock)
691{
0ff2ea7d 692 struct va_format vaf;
5d1b1b3f
AK		 693 va_list args;
694 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
695
1c13d5c0
TT		 696 es->s_last_error_ino = cpu_to_le32(ino);
697 es->s_last_error_block = cpu_to_le64(block);
698 __save_error_info(sb, function, line);
0ff2ea7d 699
efbed4dc
TT		 700 if (ext4_error_ratelimit(sb)) {
701 va_start(args, fmt);
702 vaf.fmt = fmt;
703 vaf.va = &args;
704 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u, ",
705 sb->s_id, function, line, grp);
706 if (ino)
707 printk(KERN_CONT "inode %lu: ", ino);
708 if (block)
709 printk(KERN_CONT "block %llu:",
710 (unsigned long long) block);
711 printk(KERN_CONT "%pV\n", &vaf);
712 va_end(args);
713 }
5d1b1b3f
AK		 714
715 if (test_opt(sb, ERRORS_CONT)) {
e2d67052 716 ext4_commit_super(sb, 0);
5d1b1b3f
AK		 717 return;
718 }
1c13d5c0 719
5d1b1b3f
AK		 720 ext4_unlock_group(sb, grp);
721 ext4_handle_error(sb);
722 /*
723 * We only get here in the ERRORS_RO case; relocking the group
724 * may be dangerous, but nothing bad will happen since the
725 * filesystem will have already been marked read/only and the
726 * journal has been aborted. We return 1 as a hint to callers
727 * who might what to use the return value from
25985edc 728 * ext4_grp_locked_error() to distinguish between the
5d1b1b3f
AK		 729 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
730 * aggressively from the ext4 function in question, with a
731 * more appropriate error code.
732 */
733 ext4_lock_group(sb, grp);
734 return;
735}
736
617ba13b 737void ext4_update_dynamic_rev(struct super_block *sb)
ac27a0ec 738{
617ba13b 739 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
ac27a0ec 740
617ba13b 741 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
ac27a0ec
DK		 742 return;
743
12062ddd 744 ext4_warning(sb,
ac27a0ec
DK		 745 "updating to rev %d because of new feature flag, "
746 "running e2fsck is recommended",
617ba13b 747 EXT4_DYNAMIC_REV);
ac27a0ec 748
617ba13b
MC		 749 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
750 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
751 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
ac27a0ec
DK		 752 /* leave es->s_feature_*compat flags alone */
753 /* es->s_uuid will be set by e2fsck if empty */
754
755 /*
756 * The rest of the superblock fields should be zero, and if not it
757 * means they are likely already in use, so leave them alone. We
758 * can leave it up to e2fsck to clean up any inconsistencies there.
759 */
760}
761
762/*
763 * Open the external journal device
764 */
b31e1552 765static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb)
ac27a0ec
DK		 766{
767 struct block_device *bdev;
768 char b[BDEVNAME_SIZE];
769
d4d77629 770 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
ac27a0ec
DK		 771 if (IS_ERR(bdev))
772 goto fail;
773 return bdev;
774
775fail:
b31e1552 776 ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld",
ac27a0ec
DK		 777 __bdevname(dev, b), PTR_ERR(bdev));
778 return NULL;
779}
780
781/*
782 * Release the journal device
783 */
4385bab1 784static void ext4_blkdev_put(struct block_device *bdev)
ac27a0ec 785{
4385bab1 786 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
ac27a0ec
DK		 787}
788
4385bab1 789static void ext4_blkdev_remove(struct ext4_sb_info *sbi)
ac27a0ec
DK		 790{
791 struct block_device *bdev;
ac27a0ec
DK		 792 bdev = sbi->journal_bdev;
793 if (bdev) {
4385bab1 794 ext4_blkdev_put(bdev);
ac27a0ec
DK		 795 sbi->journal_bdev = NULL;
796 }
ac27a0ec
DK		 797}
798
799static inline struct inode *orphan_list_entry(struct list_head *l)
800{
617ba13b 801 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
ac27a0ec
DK		 802}
803
617ba13b 804static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
ac27a0ec
DK		 805{
806 struct list_head *l;
807
b31e1552
ES		 808 ext4_msg(sb, KERN_ERR, "sb orphan head is %d",
809 le32_to_cpu(sbi->s_es->s_last_orphan));
ac27a0ec
DK		 810
811 printk(KERN_ERR "sb_info orphan list:\n");
812 list_for_each(l, &sbi->s_orphan) {
813 struct inode *inode = orphan_list_entry(l);
814 printk(KERN_ERR " "
815 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
816 inode->i_sb->s_id, inode->i_ino, inode,
817 inode->i_mode, inode->i_nlink,
818 NEXT_ORPHAN(inode));
819 }
820}
821
2b2d6d01 822static void ext4_put_super(struct super_block *sb)
ac27a0ec 823{
617ba13b
MC		 824 struct ext4_sb_info *sbi = EXT4_SB(sb);
825 struct ext4_super_block *es = sbi->s_es;
ef2cabf7 826 int i, err;
ac27a0ec 827
857ac889 828 ext4_unregister_li_request(sb);
e0ccfd95
CH		 829 dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
830
2e8fa54e 831 flush_workqueue(sbi->rsv_conversion_wq);
2e8fa54e 832 destroy_workqueue(sbi->rsv_conversion_wq);
4c0425ff 833
0390131b
FM		 834 if (sbi->s_journal) {
835 err = jbd2_journal_destroy(sbi->s_journal);
836 sbi->s_journal = NULL;
837 if (err < 0)
c67d859e 838 ext4_abort(sb, "Couldn't clean up the journal");
0390131b 839 }
d4edac31 840
ebd173be 841 ext4_unregister_sysfs(sb);
d3922a77 842 ext4_es_unregister_shrinker(sbi);
9105bb14 843 del_timer_sync(&sbi->s_err_report);
d4edac31
JB		 844 ext4_release_system_zone(sb);
845 ext4_mb_release(sb);
846 ext4_ext_release(sb);
847 ext4_xattr_put_super(sb);
848
ac27a0ec 849 if (!(sb->s_flags & MS_RDONLY)) {
e2b911c5 850 ext4_clear_feature_journal_needs_recovery(sb);
ac27a0ec 851 es->s_state = cpu_to_le16(sbi->s_mount_state);
ac27a0ec 852 }
58c5873a 853 if (!(sb->s_flags & MS_RDONLY))
a8e25a83
AB		 854 ext4_commit_super(sb, 1);
855
ac27a0ec
DK		 856 for (i = 0; i < sbi->s_gdb_count; i++)
857 brelse(sbi->s_group_desc[i]);
b93b41d4
AV		 858 kvfree(sbi->s_group_desc);
859 kvfree(sbi->s_flex_groups);
57042651 860 percpu_counter_destroy(&sbi->s_freeclusters_counter);
ac27a0ec
DK		 861 percpu_counter_destroy(&sbi->s_freeinodes_counter);
862 percpu_counter_destroy(&sbi->s_dirs_counter);
57042651 863 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
ac27a0ec
DK		 864 brelse(sbi->s_sbh);
865#ifdef CONFIG_QUOTA
a2d4a646 866 for (i = 0; i < EXT4_MAXQUOTAS; i++)
ac27a0ec
DK		 867 kfree(sbi->s_qf_names[i]);
868#endif
869
870 /* Debugging code just in case the in-memory inode orphan list
871 * isn't empty. The on-disk one can be non-empty if we've
872 * detected an error and taken the fs readonly, but the
873 * in-memory list had better be clean by this point. */
874 if (!list_empty(&sbi->s_orphan))
875 dump_orphan_list(sb, sbi);
876 J_ASSERT(list_empty(&sbi->s_orphan));
877
89d96a6f 878 sync_blockdev(sb->s_bdev);
f98393a6 879 invalidate_bdev(sb->s_bdev);
ac27a0ec
DK		 880 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
881 /*
882 * Invalidate the journal device's buffers. We don't want them
883 * floating about in memory - the physical journal device may
884 * hotswapped, and it breaks the `ro-after' testing code.
885 */
886 sync_blockdev(sbi->journal_bdev);
f98393a6 887 invalidate_bdev(sbi->journal_bdev);
617ba13b 888 ext4_blkdev_remove(sbi);
ac27a0ec 889 }
9c191f70
M		 890 if (sbi->s_mb_cache) {
891 ext4_xattr_destroy_cache(sbi->s_mb_cache);
892 sbi->s_mb_cache = NULL;
893 }
c5e06d10
JL		 894 if (sbi->s_mmp_tsk)
895 kthread_stop(sbi->s_mmp_tsk);
ac27a0ec 896 sb->s_fs_info = NULL;
3197ebdb
TT		 897 /*
898 * Now that we are completely done shutting down the
899 * superblock, we need to actually destroy the kobject.
900 */
3197ebdb
TT		 901 kobject_put(&sbi->s_kobj);
902 wait_for_completion(&sbi->s_kobj_unregister);
0441984a
DW		 903 if (sbi->s_chksum_driver)
904 crypto_free_shash(sbi->s_chksum_driver);
705895b6 905 kfree(sbi->s_blockgroup_lock);
ac27a0ec 906 kfree(sbi);
ac27a0ec
DK		 907}
908
e18b890b 909static struct kmem_cache *ext4_inode_cachep;
ac27a0ec
DK		 910
911/*
912 * Called inside transaction, so use GFP_NOFS
913 */
617ba13b 914static struct inode *ext4_alloc_inode(struct super_block *sb)
ac27a0ec 915{
617ba13b 916 struct ext4_inode_info *ei;
ac27a0ec 917
e6b4f8da 918 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
ac27a0ec
DK		 919 if (!ei)
920 return NULL;
0b8e58a1 921
ac27a0ec 922 ei->vfs_inode.i_version = 1;
202ee5df 923 spin_lock_init(&ei->i_raw_lock);
c9de560d
AT		 924 INIT_LIST_HEAD(&ei->i_prealloc_list);
925 spin_lock_init(&ei->i_prealloc_lock);
9a26b661
ZL		 926 ext4_es_init_tree(&ei->i_es_tree);
927 rwlock_init(&ei->i_es_lock);
edaa53ca 928 INIT_LIST_HEAD(&ei->i_es_list);
eb68d0e2 929 ei->i_es_all_nr = 0;
edaa53ca 930 ei->i_es_shk_nr = 0;
dd475925 931 ei->i_es_shrink_lblk = 0;
d2a17637
MC		 932 ei->i_reserved_data_blocks = 0;
933 ei->i_reserved_meta_blocks = 0;
934 ei->i_allocated_meta_blocks = 0;
9d0be502 935 ei->i_da_metadata_calc_len = 0;
7e731bc9 936 ei->i_da_metadata_calc_last_lblock = 0;
d2a17637 937 spin_lock_init(&(ei->i_block_reservation_lock));
a9e7f447
DM		 938#ifdef CONFIG_QUOTA
939 ei->i_reserved_quota = 0;
96c7e0d9 940 memset(&ei->i_dquot, 0, sizeof(ei->i_dquot));
a9e7f447 941#endif
8aefcd55 942 ei->jinode = NULL;
2e8fa54e 943 INIT_LIST_HEAD(&ei->i_rsv_conversion_list);
744692dc 944 spin_lock_init(&ei->i_completed_io_lock);
b436b9be
JK		 945 ei->i_sync_tid = 0;
946 ei->i_datasync_tid = 0;
f7ad6d2e 947 atomic_set(&ei->i_ioend_count, 0);
e27f41e1 948 atomic_set(&ei->i_unwritten, 0);
2e8fa54e 949 INIT_WORK(&ei->i_rsv_conversion_work, ext4_end_io_rsv_work);
b30ab0e0 950#ifdef CONFIG_EXT4_FS_ENCRYPTION
b7236e21 951 ei->i_crypt_info = NULL;
b30ab0e0 952#endif
ac27a0ec
DK		 953 return &ei->vfs_inode;
954}
955
7ff9c073
TT		 956static int ext4_drop_inode(struct inode *inode)
957{
958 int drop = generic_drop_inode(inode);
959
960 trace_ext4_drop_inode(inode, drop);
961 return drop;
962}
963
fa0d7e3d
NP		 964static void ext4_i_callback(struct rcu_head *head)
965{
966 struct inode *inode = container_of(head, struct inode, i_rcu);
fa0d7e3d
NP		 967 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
968}
969
617ba13b 970static void ext4_destroy_inode(struct inode *inode)
ac27a0ec 971{
9f7dd93d 972 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
b31e1552
ES		 973 ext4_msg(inode->i_sb, KERN_ERR,
974 "Inode %lu (%p): orphan list check failed!",
975 inode->i_ino, EXT4_I(inode));
9f7dd93d
VA		 976 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
977 EXT4_I(inode), sizeof(struct ext4_inode_info),
978 true);
979 dump_stack();
980 }
fa0d7e3d 981 call_rcu(&inode->i_rcu, ext4_i_callback);
ac27a0ec
DK		 982}
983
51cc5068 984static void init_once(void *foo)
ac27a0ec 985{
617ba13b 986 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
ac27a0ec 987
a35afb83 988 INIT_LIST_HEAD(&ei->i_orphan);
a35afb83 989 init_rwsem(&ei->xattr_sem);
0e855ac8 990 init_rwsem(&ei->i_data_sem);
ea3d7209 991 init_rwsem(&ei->i_mmap_sem);
a35afb83 992 inode_init_once(&ei->vfs_inode);
ac27a0ec
DK		 993}
994
e67bc2b3 995static int __init init_inodecache(void)
ac27a0ec 996{
617ba13b
MC		 997 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
998 sizeof(struct ext4_inode_info),
ac27a0ec 999 0, (SLAB_RECLAIM_ACCOUNT|
5d097056 1000 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
20c2df83 1001 init_once);
617ba13b 1002 if (ext4_inode_cachep == NULL)
ac27a0ec
DK		 1003 return -ENOMEM;
1004 return 0;
1005}
1006
1007static void destroy_inodecache(void)
1008{
8c0a8537
KS		 1009 /*
1010 * Make sure all delayed rcu free inodes are flushed before we
1011 * destroy cache.
1012 */
1013 rcu_barrier();
617ba13b 1014 kmem_cache_destroy(ext4_inode_cachep);
ac27a0ec
DK		 1015}
1016
0930fcc1 1017void ext4_clear_inode(struct inode *inode)
ac27a0ec 1018{
0930fcc1 1019 invalidate_inode_buffers(inode);
dbd5768f 1020 clear_inode(inode);
9f754758 1021 dquot_drop(inode);
c2ea3fde 1022 ext4_discard_preallocations(inode);
51865fda 1023 ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS);
8aefcd55
TT		 1024 if (EXT4_I(inode)->jinode) {
1025 jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode),
1026 EXT4_I(inode)->jinode);
1027 jbd2_free_inode(EXT4_I(inode)->jinode);
1028 EXT4_I(inode)->jinode = NULL;
1029 }
b7236e21
TT		 1030#ifdef CONFIG_EXT4_FS_ENCRYPTION
1031 if (EXT4_I(inode)->i_crypt_info)
c936e1ec 1032 ext4_free_encryption_info(inode, EXT4_I(inode)->i_crypt_info);
b7236e21 1033#endif
ac27a0ec
DK		 1034}
1035
1b961ac0 1036static struct inode *ext4_nfs_get_inode(struct super_block *sb,
0b8e58a1 1037 u64 ino, u32 generation)
ac27a0ec 1038{
ac27a0ec 1039 struct inode *inode;
ac27a0ec 1040
617ba13b 1041 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
ac27a0ec 1042 return ERR_PTR(-ESTALE);
617ba13b 1043 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
ac27a0ec
DK		 1044 return ERR_PTR(-ESTALE);
1045
1046 /* iget isn't really right if the inode is currently unallocated!!
1047 *
617ba13b 1048 * ext4_read_inode will return a bad_inode if the inode had been
ac27a0ec
DK		 1049 * deleted, so we should be safe.
1050 *
1051 * Currently we don't know the generation for parent directory, so
1052 * a generation of 0 means "accept any"
1053 */
f4bb2981 1054 inode = ext4_iget_normal(sb, ino);
1d1fe1ee
DH		 1055 if (IS_ERR(inode))
1056 return ERR_CAST(inode);
1057 if (generation && inode->i_generation != generation) {
ac27a0ec
DK		 1058 iput(inode);
1059 return ERR_PTR(-ESTALE);
1060 }
1b961ac0
CH		 1061
1062 return inode;
1063}
1064
1065static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
0b8e58a1 1066 int fh_len, int fh_type)
1b961ac0
CH		 1067{
1068 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
1069 ext4_nfs_get_inode);
1070}
1071
1072static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
0b8e58a1 1073 int fh_len, int fh_type)
1b961ac0
CH		 1074{
1075 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
1076 ext4_nfs_get_inode);
ac27a0ec
DK		 1077}
1078
c39a7f84
TO		 1079/*
1080 * Try to release metadata pages (indirect blocks, directories) which are
1081 * mapped via the block device. Since these pages could have journal heads
1082 * which would prevent try_to_free_buffers() from freeing them, we must use
1083 * jbd2 layer's try_to_free_buffers() function to release them.
1084 */
0b8e58a1
AD		 1085static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
1086 gfp_t wait)
c39a7f84
TO		 1087{
1088 journal_t *journal = EXT4_SB(sb)->s_journal;
1089
1090 WARN_ON(PageChecked(page));
1091 if (!page_has_buffers(page))
1092 return 0;
1093 if (journal)
1094 return jbd2_journal_try_to_free_buffers(journal, page,
d0164adc 1095 wait & ~__GFP_DIRECT_RECLAIM);
c39a7f84
TO		 1096 return try_to_free_buffers(page);
1097}
1098
ac27a0ec 1099#ifdef CONFIG_QUOTA
689c958c
LX		 1100static char *quotatypes[] = INITQFNAMES;
1101#define QTYPE2NAME(t) (quotatypes[t])
ac27a0ec 1102
617ba13b
MC		 1103static int ext4_write_dquot(struct dquot *dquot);
1104static int ext4_acquire_dquot(struct dquot *dquot);
1105static int ext4_release_dquot(struct dquot *dquot);
1106static int ext4_mark_dquot_dirty(struct dquot *dquot);
1107static int ext4_write_info(struct super_block *sb, int type);
6f28e087 1108static int ext4_quota_on(struct super_block *sb, int type, int format_id,
f00c9e44 1109 struct path *path);
ca0e05e4 1110static int ext4_quota_off(struct super_block *sb, int type);
617ba13b
MC		 1111static int ext4_quota_on_mount(struct super_block *sb, int type);
1112static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec 1113 size_t len, loff_t off);
617ba13b 1114static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec 1115 const char *data, size_t len, loff_t off);
7c319d32
AK		 1116static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
1117 unsigned int flags);
1118static int ext4_enable_quotas(struct super_block *sb);
ac27a0ec 1119
96c7e0d9
JK		 1120static struct dquot **ext4_get_dquots(struct inode *inode)
1121{
1122 return EXT4_I(inode)->i_dquot;
1123}
1124
61e225dc 1125static const struct dquot_operations ext4_quota_operations = {
60e58e0f 1126 .get_reserved_space = ext4_get_reserved_space,
617ba13b
MC		 1127 .write_dquot = ext4_write_dquot,
1128 .acquire_dquot = ext4_acquire_dquot,
1129 .release_dquot = ext4_release_dquot,
1130 .mark_dirty = ext4_mark_dquot_dirty,
a5b5ee32
JK		 1131 .write_info = ext4_write_info,
1132 .alloc_dquot = dquot_alloc,
1133 .destroy_dquot = dquot_destroy,
040cb378 1134 .get_projid = ext4_get_projid,
be6257b2 1135 .get_next_id = dquot_get_next_id,
ac27a0ec
DK		 1136};
1137
0d54b217 1138static const struct quotactl_ops ext4_qctl_operations = {
617ba13b 1139 .quota_on = ext4_quota_on,
ca0e05e4 1140 .quota_off = ext4_quota_off,
287a8095 1141 .quota_sync = dquot_quota_sync,
0a240339 1142 .get_state = dquot_get_state,
287a8095
CH		 1143 .set_info = dquot_set_dqinfo,
1144 .get_dqblk = dquot_get_dqblk,
1145 .set_dqblk = dquot_set_dqblk
ac27a0ec
DK		 1146};
1147#endif
1148
ee9b6d61 1149static const struct super_operations ext4_sops = {
617ba13b
MC		 1150 .alloc_inode = ext4_alloc_inode,
1151 .destroy_inode = ext4_destroy_inode,
617ba13b
MC		 1152 .write_inode = ext4_write_inode,
1153 .dirty_inode = ext4_dirty_inode,
7ff9c073 1154 .drop_inode = ext4_drop_inode,
0930fcc1 1155 .evict_inode = ext4_evict_inode,
617ba13b 1156 .put_super = ext4_put_super,
617ba13b 1157 .sync_fs = ext4_sync_fs,
c4be0c1d
TS		 1158 .freeze_fs = ext4_freeze,
1159 .unfreeze_fs = ext4_unfreeze,
617ba13b
MC		 1160 .statfs = ext4_statfs,
1161 .remount_fs = ext4_remount,
617ba13b 1162 .show_options = ext4_show_options,
ac27a0ec 1163#ifdef CONFIG_QUOTA
617ba13b
MC		 1164 .quota_read = ext4_quota_read,
1165 .quota_write = ext4_quota_write,
96c7e0d9 1166 .get_dquots = ext4_get_dquots,
ac27a0ec 1167#endif
c39a7f84 1168 .bdev_try_to_free_page = bdev_try_to_free_page,
ac27a0ec
DK		 1169};
1170
39655164 1171static const struct export_operations ext4_export_ops = {
1b961ac0
CH		 1172 .fh_to_dentry = ext4_fh_to_dentry,
1173 .fh_to_parent = ext4_fh_to_parent,
617ba13b 1174 .get_parent = ext4_get_parent,
ac27a0ec
DK		 1175};
1176
1177enum {
1178 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
1179 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
72578c33 1180 Opt_nouid32, Opt_debug, Opt_removed,
ac27a0ec 1181 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
72578c33 1182 Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload,
ad4eec61
ES		 1183 Opt_commit, Opt_min_batch_time, Opt_max_batch_time, Opt_journal_dev,
1184 Opt_journal_path, Opt_journal_checksum, Opt_journal_async_commit,
ac27a0ec 1185 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
6ddb2447 1186 Opt_data_err_abort, Opt_data_err_ignore, Opt_test_dummy_encryption,
ac27a0ec 1187 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
5a20bdfc 1188 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
ee4a3fcd 1189 Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err,
923ae0ff 1190 Opt_usrquota, Opt_grpquota, Opt_i_version, Opt_dax,
1449032b 1191 Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_mblk_io_submit,
a26f4992 1192 Opt_lazytime, Opt_nolazytime,
1449032b 1193 Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity,
5328e635 1194 Opt_inode_readahead_blks, Opt_journal_ioprio,
744692dc 1195 Opt_dioread_nolock, Opt_dioread_lock,
fc6cb1cd 1196 Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable,
c6d3d56d 1197 Opt_max_dir_size_kb, Opt_nojournal_checksum,
ac27a0ec
DK		 1198};
1199
a447c093 1200static const match_table_t tokens = {
ac27a0ec
DK		 1201 {Opt_bsd_df, "bsddf"},
1202 {Opt_minix_df, "minixdf"},
1203 {Opt_grpid, "grpid"},
1204 {Opt_grpid, "bsdgroups"},
1205 {Opt_nogrpid, "nogrpid"},
1206 {Opt_nogrpid, "sysvgroups"},
1207 {Opt_resgid, "resgid=%u"},
1208 {Opt_resuid, "resuid=%u"},
1209 {Opt_sb, "sb=%u"},
1210 {Opt_err_cont, "errors=continue"},
1211 {Opt_err_panic, "errors=panic"},
1212 {Opt_err_ro, "errors=remount-ro"},
1213 {Opt_nouid32, "nouid32"},
ac27a0ec 1214 {Opt_debug, "debug"},
72578c33
TT		 1215 {Opt_removed, "oldalloc"},
1216 {Opt_removed, "orlov"},
ac27a0ec
DK		 1217 {Opt_user_xattr, "user_xattr"},
1218 {Opt_nouser_xattr, "nouser_xattr"},
1219 {Opt_acl, "acl"},
1220 {Opt_noacl, "noacl"},
e3bb52ae 1221 {Opt_noload, "norecovery"},
5a916be1 1222 {Opt_noload, "noload"},
72578c33
TT		 1223 {Opt_removed, "nobh"},
1224 {Opt_removed, "bh"},
ac27a0ec 1225 {Opt_commit, "commit=%u"},
30773840
TT		 1226 {Opt_min_batch_time, "min_batch_time=%u"},
1227 {Opt_max_batch_time, "max_batch_time=%u"},
ac27a0ec 1228 {Opt_journal_dev, "journal_dev=%u"},
ad4eec61 1229 {Opt_journal_path, "journal_path=%s"},
818d276c 1230 {Opt_journal_checksum, "journal_checksum"},
c6d3d56d 1231 {Opt_nojournal_checksum, "nojournal_checksum"},
818d276c 1232 {Opt_journal_async_commit, "journal_async_commit"},
ac27a0ec
DK		 1233 {Opt_abort, "abort"},
1234 {Opt_data_journal, "data=journal"},
1235 {Opt_data_ordered, "data=ordered"},
1236 {Opt_data_writeback, "data=writeback"},
5bf5683a
HK		 1237 {Opt_data_err_abort, "data_err=abort"},
1238 {Opt_data_err_ignore, "data_err=ignore"},
ac27a0ec
DK		 1239 {Opt_offusrjquota, "usrjquota="},
1240 {Opt_usrjquota, "usrjquota=%s"},
1241 {Opt_offgrpjquota, "grpjquota="},
1242 {Opt_grpjquota, "grpjquota=%s"},
1243 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
1244 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
5a20bdfc 1245 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
ac27a0ec
DK		 1246 {Opt_grpquota, "grpquota"},
1247 {Opt_noquota, "noquota"},
1248 {Opt_quota, "quota"},
1249 {Opt_usrquota, "usrquota"},
1250 {Opt_barrier, "barrier=%u"},
06705bff
TT		 1251 {Opt_barrier, "barrier"},
1252 {Opt_nobarrier, "nobarrier"},
25ec56b5 1253 {Opt_i_version, "i_version"},
923ae0ff 1254 {Opt_dax, "dax"},
c9de560d 1255 {Opt_stripe, "stripe=%u"},
64769240 1256 {Opt_delalloc, "delalloc"},
a26f4992
TT		 1257 {Opt_lazytime, "lazytime"},
1258 {Opt_nolazytime, "nolazytime"},
dd919b98 1259 {Opt_nodelalloc, "nodelalloc"},
36ade451
JK		 1260 {Opt_removed, "mblk_io_submit"},
1261 {Opt_removed, "nomblk_io_submit"},
6fd058f7
TT		 1262 {Opt_block_validity, "block_validity"},
1263 {Opt_noblock_validity, "noblock_validity"},
240799cd 1264 {Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
b3881f74 1265 {Opt_journal_ioprio, "journal_ioprio=%u"},
afd4672d 1266 {Opt_auto_da_alloc, "auto_da_alloc=%u"},
06705bff
TT		 1267 {Opt_auto_da_alloc, "auto_da_alloc"},
1268 {Opt_noauto_da_alloc, "noauto_da_alloc"},
744692dc
JZ		 1269 {Opt_dioread_nolock, "dioread_nolock"},
1270 {Opt_dioread_lock, "dioread_lock"},
5328e635
ES		 1271 {Opt_discard, "discard"},
1272 {Opt_nodiscard, "nodiscard"},
fc6cb1cd
TT		 1273 {Opt_init_itable, "init_itable=%u"},
1274 {Opt_init_itable, "init_itable"},
1275 {Opt_noinit_itable, "noinit_itable"},
df981d03 1276 {Opt_max_dir_size_kb, "max_dir_size_kb=%u"},
6ddb2447 1277 {Opt_test_dummy_encryption, "test_dummy_encryption"},
c7198b9c
TT		 1278 {Opt_removed, "check=none"}, /* mount option from ext2/3 */
1279 {Opt_removed, "nocheck"}, /* mount option from ext2/3 */
1280 {Opt_removed, "reservation"}, /* mount option from ext2/3 */
1281 {Opt_removed, "noreservation"}, /* mount option from ext2/3 */
1282 {Opt_removed, "journal=%u"}, /* mount option from ext2/3 */
f3f12faa 1283 {Opt_err, NULL},
ac27a0ec
DK		 1284};
1285
617ba13b 1286static ext4_fsblk_t get_sb_block(void **data)
ac27a0ec 1287{
617ba13b 1288 ext4_fsblk_t sb_block;
ac27a0ec
DK		 1289 char *options = (char *) *data;
1290
1291 if (!options || strncmp(options, "sb=", 3) != 0)
1292 return 1; /* Default location */
0b8e58a1 1293
ac27a0ec 1294 options += 3;
0b8e58a1 1295 /* TODO: use simple_strtoll with >32bit ext4 */
ac27a0ec
DK		 1296 sb_block = simple_strtoul(options, &options, 0);
1297 if (*options && *options != ',') {
4776004f 1298 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
ac27a0ec
DK		 1299 (char *) *data);
1300 return 1;
1301 }
1302 if (*options == ',')
1303 options++;
1304 *data = (void *) options;
0b8e58a1 1305
ac27a0ec
DK		 1306 return sb_block;
1307}
1308
b3881f74 1309#define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
437ca0fd
DM		 1310static char deprecated_msg[] = "Mount option \"%s\" will be removed by %s\n"
1311 "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
b3881f74 1312
56c50f11
DM		 1313#ifdef CONFIG_QUOTA
1314static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
1315{
1316 struct ext4_sb_info *sbi = EXT4_SB(sb);
1317 char *qname;
03dafb5f 1318 int ret = -1;
56c50f11
DM		 1319
1320 if (sb_any_quota_loaded(sb) &&
1321 !sbi->s_qf_names[qtype]) {
1322 ext4_msg(sb, KERN_ERR,
1323 "Cannot change journaled "
1324 "quota options when quota turned on");
57f73c2c 1325 return -1;
56c50f11 1326 }
e2b911c5 1327 if (ext4_has_feature_quota(sb)) {
262b4662
JK		 1328 ext4_msg(sb, KERN_ERR, "Cannot set journaled quota options "
1329 "when QUOTA feature is enabled");
1330 return -1;
1331 }
56c50f11
DM		 1332 qname = match_strdup(args);
1333 if (!qname) {
1334 ext4_msg(sb, KERN_ERR,
1335 "Not enough memory for storing quotafile name");
57f73c2c 1336 return -1;
56c50f11 1337 }
03dafb5f
CG		 1338 if (sbi->s_qf_names[qtype]) {
1339 if (strcmp(sbi->s_qf_names[qtype], qname) == 0)
1340 ret = 1;
1341 else
1342 ext4_msg(sb, KERN_ERR,
1343 "%s quota file already specified",
1344 QTYPE2NAME(qtype));
1345 goto errout;
56c50f11 1346 }
03dafb5f 1347 if (strchr(qname, '/')) {
56c50f11
DM		 1348 ext4_msg(sb, KERN_ERR,
1349 "quotafile must be on filesystem root");
03dafb5f 1350 goto errout;
56c50f11 1351 }
03dafb5f 1352 sbi->s_qf_names[qtype] = qname;
fd8c37ec 1353 set_opt(sb, QUOTA);
56c50f11 1354 return 1;
03dafb5f
CG		 1355errout:
1356 kfree(qname);
1357 return ret;
56c50f11
DM		 1358}
1359
1360static int clear_qf_name(struct super_block *sb, int qtype)
1361{
1362
1363 struct ext4_sb_info *sbi = EXT4_SB(sb);
1364
1365 if (sb_any_quota_loaded(sb) &&
1366 sbi->s_qf_names[qtype]) {
1367 ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options"
1368 " when quota turned on");
57f73c2c 1369 return -1;
56c50f11 1370 }
03dafb5f 1371 kfree(sbi->s_qf_names[qtype]);
56c50f11
DM		 1372 sbi->s_qf_names[qtype] = NULL;
1373 return 1;
1374}
1375#endif
1376
26092bf5
TT		 1377#define MOPT_SET 0x0001
1378#define MOPT_CLEAR 0x0002
1379#define MOPT_NOSUPPORT 0x0004
1380#define MOPT_EXPLICIT 0x0008
1381#define MOPT_CLEAR_ERR 0x0010
1382#define MOPT_GTE0 0x0020
ac27a0ec 1383#ifdef CONFIG_QUOTA
26092bf5
TT		 1384#define MOPT_Q 0
1385#define MOPT_QFMT 0x0040
1386#else
1387#define MOPT_Q MOPT_NOSUPPORT
1388#define MOPT_QFMT MOPT_NOSUPPORT
ac27a0ec 1389#endif
26092bf5 1390#define MOPT_DATAJ 0x0080
8dc0aa8c
TT		 1391#define MOPT_NO_EXT2 0x0100
1392#define MOPT_NO_EXT3 0x0200
1393#define MOPT_EXT4_ONLY (MOPT_NO_EXT2 | MOPT_NO_EXT3)
ad4eec61 1394#define MOPT_STRING 0x0400
26092bf5
TT		 1395
1396static const struct mount_opts {
1397 int token;
1398 int mount_opt;
1399 int flags;
1400} ext4_mount_opts[] = {
1401 {Opt_minix_df, EXT4_MOUNT_MINIX_DF, MOPT_SET},
1402 {Opt_bsd_df, EXT4_MOUNT_MINIX_DF, MOPT_CLEAR},
1403 {Opt_grpid, EXT4_MOUNT_GRPID, MOPT_SET},
1404 {Opt_nogrpid, EXT4_MOUNT_GRPID, MOPT_CLEAR},
26092bf5
TT		 1405 {Opt_block_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_SET},
1406 {Opt_noblock_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_CLEAR},
8dc0aa8c
TT		 1407 {Opt_dioread_nolock, EXT4_MOUNT_DIOREAD_NOLOCK,
1408 MOPT_EXT4_ONLY | MOPT_SET},
1409 {Opt_dioread_lock, EXT4_MOUNT_DIOREAD_NOLOCK,
1410 MOPT_EXT4_ONLY | MOPT_CLEAR},
26092bf5
TT		 1411 {Opt_discard, EXT4_MOUNT_DISCARD, MOPT_SET},
1412 {Opt_nodiscard, EXT4_MOUNT_DISCARD, MOPT_CLEAR},
8dc0aa8c
TT		 1413 {Opt_delalloc, EXT4_MOUNT_DELALLOC,
1414 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
1415 {Opt_nodelalloc, EXT4_MOUNT_DELALLOC,
59d9fa5c 1416 MOPT_EXT4_ONLY | MOPT_CLEAR},
c6d3d56d
DW		 1417 {Opt_nojournal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
1418 MOPT_EXT4_ONLY | MOPT_CLEAR},
8dc0aa8c 1419 {Opt_journal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
1e381f60 1420 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
26092bf5 1421 {Opt_journal_async_commit, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT |
8dc0aa8c 1422 EXT4_MOUNT_JOURNAL_CHECKSUM),
1e381f60 1423 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
8dc0aa8c 1424 {Opt_noload, EXT4_MOUNT_NOLOAD, MOPT_NO_EXT2 | MOPT_SET},
26092bf5
TT		 1425 {Opt_err_panic, EXT4_MOUNT_ERRORS_PANIC, MOPT_SET | MOPT_CLEAR_ERR},
1426 {Opt_err_ro, EXT4_MOUNT_ERRORS_RO, MOPT_SET | MOPT_CLEAR_ERR},
1427 {Opt_err_cont, EXT4_MOUNT_ERRORS_CONT, MOPT_SET | MOPT_CLEAR_ERR},
8dc0aa8c
TT		 1428 {Opt_data_err_abort, EXT4_MOUNT_DATA_ERR_ABORT,
1429 MOPT_NO_EXT2 | MOPT_SET},
1430 {Opt_data_err_ignore, EXT4_MOUNT_DATA_ERR_ABORT,
1431 MOPT_NO_EXT2 | MOPT_CLEAR},
26092bf5
TT		 1432 {Opt_barrier, EXT4_MOUNT_BARRIER, MOPT_SET},
1433 {Opt_nobarrier, EXT4_MOUNT_BARRIER, MOPT_CLEAR},
1434 {Opt_noauto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_SET},
1435 {Opt_auto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_CLEAR},
1436 {Opt_noinit_itable, EXT4_MOUNT_INIT_INODE_TABLE, MOPT_CLEAR},
1437 {Opt_commit, 0, MOPT_GTE0},
1438 {Opt_max_batch_time, 0, MOPT_GTE0},
1439 {Opt_min_batch_time, 0, MOPT_GTE0},
1440 {Opt_inode_readahead_blks, 0, MOPT_GTE0},
1441 {Opt_init_itable, 0, MOPT_GTE0},
923ae0ff 1442 {Opt_dax, EXT4_MOUNT_DAX, MOPT_SET},
26092bf5 1443 {Opt_stripe, 0, MOPT_GTE0},
0efb3b23
JK		 1444 {Opt_resuid, 0, MOPT_GTE0},
1445 {Opt_resgid, 0, MOPT_GTE0},
5ba92bcf
CM		 1446 {Opt_journal_dev, 0, MOPT_NO_EXT2 | MOPT_GTE0},
1447 {Opt_journal_path, 0, MOPT_NO_EXT2 | MOPT_STRING},
1448 {Opt_journal_ioprio, 0, MOPT_NO_EXT2 | MOPT_GTE0},
8dc0aa8c
TT		 1449 {Opt_data_journal, EXT4_MOUNT_JOURNAL_DATA, MOPT_NO_EXT2 | MOPT_DATAJ},
1450 {Opt_data_ordered, EXT4_MOUNT_ORDERED_DATA, MOPT_NO_EXT2 | MOPT_DATAJ},
1451 {Opt_data_writeback, EXT4_MOUNT_WRITEBACK_DATA,
1452 MOPT_NO_EXT2 | MOPT_DATAJ},
26092bf5
TT		 1453 {Opt_user_xattr, EXT4_MOUNT_XATTR_USER, MOPT_SET},
1454 {Opt_nouser_xattr, EXT4_MOUNT_XATTR_USER, MOPT_CLEAR},
03010a33 1455#ifdef CONFIG_EXT4_FS_POSIX_ACL
26092bf5
TT		 1456 {Opt_acl, EXT4_MOUNT_POSIX_ACL, MOPT_SET},
1457 {Opt_noacl, EXT4_MOUNT_POSIX_ACL, MOPT_CLEAR},
ac27a0ec 1458#else
26092bf5
TT		 1459 {Opt_acl, 0, MOPT_NOSUPPORT},
1460 {Opt_noacl, 0, MOPT_NOSUPPORT},
ac27a0ec 1461#endif
26092bf5
TT		 1462 {Opt_nouid32, EXT4_MOUNT_NO_UID32, MOPT_SET},
1463 {Opt_debug, EXT4_MOUNT_DEBUG, MOPT_SET},
1464 {Opt_quota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA, MOPT_SET | MOPT_Q},
1465 {Opt_usrquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA,
1466 MOPT_SET | MOPT_Q},
1467 {Opt_grpquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_GRPQUOTA,
1468 MOPT_SET | MOPT_Q},
1469 {Opt_noquota, (EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA |
1470 EXT4_MOUNT_GRPQUOTA), MOPT_CLEAR | MOPT_Q},
1471 {Opt_usrjquota, 0, MOPT_Q},
1472 {Opt_grpjquota, 0, MOPT_Q},
1473 {Opt_offusrjquota, 0, MOPT_Q},
1474 {Opt_offgrpjquota, 0, MOPT_Q},
1475 {Opt_jqfmt_vfsold, QFMT_VFS_OLD, MOPT_QFMT},
1476 {Opt_jqfmt_vfsv0, QFMT_VFS_V0, MOPT_QFMT},
1477 {Opt_jqfmt_vfsv1, QFMT_VFS_V1, MOPT_QFMT},
df981d03 1478 {Opt_max_dir_size_kb, 0, MOPT_GTE0},
6ddb2447 1479 {Opt_test_dummy_encryption, 0, MOPT_GTE0},
26092bf5
TT		 1480 {Opt_err, 0, 0}
1481};
1482
1483static int handle_mount_opt(struct super_block *sb, char *opt, int token,
1484 substring_t *args, unsigned long *journal_devnum,
1485 unsigned int *journal_ioprio, int is_remount)
1486{
1487 struct ext4_sb_info *sbi = EXT4_SB(sb);
1488 const struct mount_opts *m;
08cefc7a
EB		 1489 kuid_t uid;
1490 kgid_t gid;
26092bf5
TT		 1491 int arg = 0;
1492
57f73c2c
TT		 1493#ifdef CONFIG_QUOTA
1494 if (token == Opt_usrjquota)
1495 return set_qf_name(sb, USRQUOTA, &args[0]);
1496 else if (token == Opt_grpjquota)
1497 return set_qf_name(sb, GRPQUOTA, &args[0]);
1498 else if (token == Opt_offusrjquota)
1499 return clear_qf_name(sb, USRQUOTA);
1500 else if (token == Opt_offgrpjquota)
1501 return clear_qf_name(sb, GRPQUOTA);
1502#endif
26092bf5 1503 switch (token) {
f7048605
TT		 1504 case Opt_noacl:
1505 case Opt_nouser_xattr:
1506 ext4_msg(sb, KERN_WARNING, deprecated_msg, opt, "3.5");
1507 break;
26092bf5
TT		 1508 case Opt_sb:
1509 return 1; /* handled by get_sb_block() */
1510 case Opt_removed:
5f3633e3 1511 ext4_msg(sb, KERN_WARNING, "Ignoring removed %s option", opt);
26092bf5 1512 return 1;
26092bf5
TT		 1513 case Opt_abort:
1514 sbi->s_mount_flags |= EXT4_MF_FS_ABORTED;
1515 return 1;
1516 case Opt_i_version:
1517 sb->s_flags |= MS_I_VERSION;
1518 return 1;
a26f4992
TT		 1519 case Opt_lazytime:
1520 sb->s_flags |= MS_LAZYTIME;
1521 return 1;
1522 case Opt_nolazytime:
1523 sb->s_flags &= ~MS_LAZYTIME;
1524 return 1;
26092bf5
TT		 1525 }
1526
5f3633e3
JK		 1527 for (m = ext4_mount_opts; m->token != Opt_err; m++)
1528 if (token == m->token)
1529 break;
1530
1531 if (m->token == Opt_err) {
1532 ext4_msg(sb, KERN_ERR, "Unrecognized mount option \"%s\" "
1533 "or missing value", opt);
1534 return -1;
1535 }
1536
8dc0aa8c
TT		 1537 if ((m->flags & MOPT_NO_EXT2) && IS_EXT2_SB(sb)) {
1538 ext4_msg(sb, KERN_ERR,
1539 "Mount option \"%s\" incompatible with ext2", opt);
1540 return -1;
1541 }
1542 if ((m->flags & MOPT_NO_EXT3) && IS_EXT3_SB(sb)) {
1543 ext4_msg(sb, KERN_ERR,
1544 "Mount option \"%s\" incompatible with ext3", opt);
1545 return -1;
1546 }
1547
ad4eec61 1548 if (args->from && !(m->flags & MOPT_STRING) && match_int(args, &arg))
5f3633e3
JK		 1549 return -1;
1550 if (args->from && (m->flags & MOPT_GTE0) && (arg < 0))
1551 return -1;
c93cf2d7
DM		 1552 if (m->flags & MOPT_EXPLICIT) {
1553 if (m->mount_opt & EXT4_MOUNT_DELALLOC) {
1554 set_opt2(sb, EXPLICIT_DELALLOC);
1e381f60
DM		 1555 } else if (m->mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) {
1556 set_opt2(sb, EXPLICIT_JOURNAL_CHECKSUM);
c93cf2d7
DM		 1557 } else
1558 return -1;
1559 }
5f3633e3
JK		 1560 if (m->flags & MOPT_CLEAR_ERR)
1561 clear_opt(sb, ERRORS_MASK);
1562 if (token == Opt_noquota && sb_any_quota_loaded(sb)) {
1563 ext4_msg(sb, KERN_ERR, "Cannot change quota "
1564 "options when quota turned on");
1565 return -1;
1566 }
1567
1568 if (m->flags & MOPT_NOSUPPORT) {
1569 ext4_msg(sb, KERN_ERR, "%s option not supported", opt);
1570 } else if (token == Opt_commit) {
1571 if (arg == 0)
1572 arg = JBD2_DEFAULT_MAX_COMMIT_AGE;
1573 sbi->s_commit_interval = HZ * arg;
1574 } else if (token == Opt_max_batch_time) {
5f3633e3
JK		 1575 sbi->s_max_batch_time = arg;
1576 } else if (token == Opt_min_batch_time) {
1577 sbi->s_min_batch_time = arg;
1578 } else if (token == Opt_inode_readahead_blks) {
e33e60ea
JK		 1579 if (arg && (arg > (1 << 30) || !is_power_of_2(arg))) {
1580 ext4_msg(sb, KERN_ERR,
1581 "EXT4-fs: inode_readahead_blks must be "
1582 "0 or a power of 2 smaller than 2^31");
26092bf5 1583 return -1;
5f3633e3
JK		 1584 }
1585 sbi->s_inode_readahead_blks = arg;
1586 } else if (token == Opt_init_itable) {
1587 set_opt(sb, INIT_INODE_TABLE);
1588 if (!args->from)
1589 arg = EXT4_DEF_LI_WAIT_MULT;
1590 sbi->s_li_wait_mult = arg;
1591 } else if (token == Opt_max_dir_size_kb) {
1592 sbi->s_max_dir_size_kb = arg;
1593 } else if (token == Opt_stripe) {
1594 sbi->s_stripe = arg;
1595 } else if (token == Opt_resuid) {
1596 uid = make_kuid(current_user_ns(), arg);
1597 if (!uid_valid(uid)) {
1598 ext4_msg(sb, KERN_ERR, "Invalid uid value %d", arg);
26092bf5
TT		 1599 return -1;
1600 }
5f3633e3
JK		 1601 sbi->s_resuid = uid;
1602 } else if (token == Opt_resgid) {
1603 gid = make_kgid(current_user_ns(), arg);
1604 if (!gid_valid(gid)) {
1605 ext4_msg(sb, KERN_ERR, "Invalid gid value %d", arg);
1606 return -1;
1607 }
1608 sbi->s_resgid = gid;
1609 } else if (token == Opt_journal_dev) {
1610 if (is_remount) {
1611 ext4_msg(sb, KERN_ERR,
1612 "Cannot specify journal on remount");
1613 return -1;
1614 }
1615 *journal_devnum = arg;
ad4eec61
ES		 1616 } else if (token == Opt_journal_path) {
1617 char *journal_path;
1618 struct inode *journal_inode;
1619 struct path path;
1620 int error;
1621
1622 if (is_remount) {
1623 ext4_msg(sb, KERN_ERR,
1624 "Cannot specify journal on remount");
1625 return -1;
1626 }
1627 journal_path = match_strdup(&args[0]);
1628 if (!journal_path) {
1629 ext4_msg(sb, KERN_ERR, "error: could not dup "
1630 "journal device string");
1631 return -1;
1632 }
1633
1634 error = kern_path(journal_path, LOOKUP_FOLLOW, &path);
1635 if (error) {
1636 ext4_msg(sb, KERN_ERR, "error: could not find "
1637 "journal device path: error %d", error);
1638 kfree(journal_path);
1639 return -1;
1640 }
1641
2b0143b5 1642 journal_inode = d_inode(path.dentry);
ad4eec61
ES		 1643 if (!S_ISBLK(journal_inode->i_mode)) {
1644 ext4_msg(sb, KERN_ERR, "error: journal path %s "
1645 "is not a block device", journal_path);
1646 path_put(&path);
1647 kfree(journal_path);
1648 return -1;
1649 }
1650
1651 *journal_devnum = new_encode_dev(journal_inode->i_rdev);
1652 path_put(&path);
1653 kfree(journal_path);
5f3633e3
JK		 1654 } else if (token == Opt_journal_ioprio) {
1655 if (arg > 7) {
1656 ext4_msg(sb, KERN_ERR, "Invalid journal IO priority"
1657 " (must be 0-7)");
1658 return -1;
1659 }
1660 *journal_ioprio =
1661 IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, arg);
6ddb2447
TT		 1662 } else if (token == Opt_test_dummy_encryption) {
1663#ifdef CONFIG_EXT4_FS_ENCRYPTION
1664 sbi->s_mount_flags |= EXT4_MF_TEST_DUMMY_ENCRYPTION;
1665 ext4_msg(sb, KERN_WARNING,
1666 "Test dummy encryption mode enabled");
1667#else
1668 ext4_msg(sb, KERN_WARNING,
1669 "Test dummy encryption mount option ignored");
1670#endif
5f3633e3
JK		 1671 } else if (m->flags & MOPT_DATAJ) {
1672 if (is_remount) {
1673 if (!sbi->s_journal)
1674 ext4_msg(sb, KERN_WARNING, "Remounting file system with no journal so ignoring journalled data option");
1675 else if (test_opt(sb, DATA_FLAGS) != m->mount_opt) {
0efb3b23 1676 ext4_msg(sb, KERN_ERR,
26092bf5 1677 "Cannot change data mode on remount");
26092bf5 1678 return -1;
ac27a0ec 1679 }
26092bf5 1680 } else {
5f3633e3
JK		 1681 clear_opt(sb, DATA_FLAGS);
1682 sbi->s_mount_opt |= m->mount_opt;
ac27a0ec 1683 }
5f3633e3
JK		 1684#ifdef CONFIG_QUOTA
1685 } else if (m->flags & MOPT_QFMT) {
1686 if (sb_any_quota_loaded(sb) &&
1687 sbi->s_jquota_fmt != m->mount_opt) {
1688 ext4_msg(sb, KERN_ERR, "Cannot change journaled "
1689 "quota options when quota turned on");
1690 return -1;
1691 }
e2b911c5 1692 if (ext4_has_feature_quota(sb)) {
262b4662
JK		 1693 ext4_msg(sb, KERN_ERR,
1694 "Cannot set journaled quota options "
1695 "when QUOTA feature is enabled");
1696 return -1;
1697 }
5f3633e3 1698 sbi->s_jquota_fmt = m->mount_opt;
923ae0ff 1699#endif
923ae0ff 1700 } else if (token == Opt_dax) {
ef83b6e8
DW		 1701#ifdef CONFIG_FS_DAX
1702 ext4_msg(sb, KERN_WARNING,
1703 "DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
1704 sbi->s_mount_opt |= m->mount_opt;
1705#else
923ae0ff
RZ		 1706 ext4_msg(sb, KERN_INFO, "dax option not supported");
1707 return -1;
5f3633e3
JK		 1708#endif
1709 } else {
1710 if (!args->from)
1711 arg = 1;
1712 if (m->flags & MOPT_CLEAR)
1713 arg = !arg;
1714 else if (unlikely(!(m->flags & MOPT_SET))) {
1715 ext4_msg(sb, KERN_WARNING,
1716 "buggy handling of option %s", opt);
1717 WARN_ON(1);
1718 return -1;
1719 }
1720 if (arg != 0)
1721 sbi->s_mount_opt |= m->mount_opt;
1722 else
1723 sbi->s_mount_opt &= ~m->mount_opt;
26092bf5 1724 }
5f3633e3 1725 return 1;
26092bf5
TT		 1726}
1727
1728static int parse_options(char *options, struct super_block *sb,
1729 unsigned long *journal_devnum,
1730 unsigned int *journal_ioprio,
1731 int is_remount)
1732{
1733 struct ext4_sb_info *sbi = EXT4_SB(sb);
1734 char *p;
1735 substring_t args[MAX_OPT_ARGS];
1736 int token;
1737
1738 if (!options)
1739 return 1;
1740
1741 while ((p = strsep(&options, ",")) != NULL) {
1742 if (!*p)
1743 continue;
1744 /*
1745 * Initialize args struct so we know whether arg was
1746 * found; some options take optional arguments.
1747 */
caecd0af 1748 args[0].to = args[0].from = NULL;
26092bf5
TT		 1749 token = match_token(p, tokens, args);
1750 if (handle_mount_opt(sb, p, token, args, journal_devnum,
1751 journal_ioprio, is_remount) < 0)
1752 return 0;
ac27a0ec
DK		 1753 }
1754#ifdef CONFIG_QUOTA
e2b911c5 1755 if (ext4_has_feature_quota(sb) &&
262b4662
JK		 1756 (test_opt(sb, USRQUOTA) || test_opt(sb, GRPQUOTA))) {
1757 ext4_msg(sb, KERN_ERR, "Cannot set quota options when QUOTA "
1758 "feature is enabled");
1759 return 0;
1760 }
ac27a0ec 1761 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
482a7425 1762 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
fd8c37ec 1763 clear_opt(sb, USRQUOTA);
ac27a0ec 1764
482a7425 1765 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
fd8c37ec 1766 clear_opt(sb, GRPQUOTA);
ac27a0ec 1767
56c50f11 1768 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
b31e1552
ES		 1769 ext4_msg(sb, KERN_ERR, "old and new quota "
1770 "format mixing");
ac27a0ec
DK		 1771 return 0;
1772 }
1773
1774 if (!sbi->s_jquota_fmt) {
b31e1552
ES		 1775 ext4_msg(sb, KERN_ERR, "journaled quota format "
1776 "not specified");
ac27a0ec
DK		 1777 return 0;
1778 }
ac27a0ec
DK		 1779 }
1780#endif
261cb20c
JK		 1781 if (test_opt(sb, DIOREAD_NOLOCK)) {
1782 int blocksize =
1783 BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);
1784
1785 if (blocksize < PAGE_CACHE_SIZE) {
1786 ext4_msg(sb, KERN_ERR, "can't mount with "
1787 "dioread_nolock if block size != PAGE_SIZE");
1788 return 0;
1789 }
1790 }
d4f76107
JK		 1791 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA &&
1792 test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
1793 ext4_msg(sb, KERN_ERR, "can't mount with journal_async_commit "
1794 "in data=ordered mode");
1795 return 0;
1796 }
ac27a0ec
DK		 1797 return 1;
1798}
1799
2adf6da8
TT		 1800static inline void ext4_show_quota_options(struct seq_file *seq,
1801 struct super_block *sb)
1802{
1803#if defined(CONFIG_QUOTA)
1804 struct ext4_sb_info *sbi = EXT4_SB(sb);
1805
1806 if (sbi->s_jquota_fmt) {
1807 char *fmtname = "";
1808
1809 switch (sbi->s_jquota_fmt) {
1810 case QFMT_VFS_OLD:
1811 fmtname = "vfsold";
1812 break;
1813 case QFMT_VFS_V0:
1814 fmtname = "vfsv0";
1815 break;
1816 case QFMT_VFS_V1:
1817 fmtname = "vfsv1";
1818 break;
1819 }
1820 seq_printf(seq, ",jqfmt=%s", fmtname);
1821 }
1822
1823 if (sbi->s_qf_names[USRQUOTA])
a068acf2 1824 seq_show_option(seq, "usrjquota", sbi->s_qf_names[USRQUOTA]);
2adf6da8
TT		 1825
1826 if (sbi->s_qf_names[GRPQUOTA])
a068acf2 1827 seq_show_option(seq, "grpjquota", sbi->s_qf_names[GRPQUOTA]);
2adf6da8
TT		 1828#endif
1829}
1830
5a916be1
TT		 1831static const char *token2str(int token)
1832{
50df9fd5 1833 const struct match_token *t;
5a916be1
TT		 1834
1835 for (t = tokens; t->token != Opt_err; t++)
1836 if (t->token == token && !strchr(t->pattern, '='))
1837 break;
1838 return t->pattern;
1839}
1840
2adf6da8
TT		 1841/*
1842 * Show an option if
1843 * - it's set to a non-default value OR
1844 * - if the per-sb default is different from the global default
1845 */
66acdcf4
TT		 1846static int _ext4_show_options(struct seq_file *seq, struct super_block *sb,
1847 int nodefs)
2adf6da8 1848{
2adf6da8
TT		 1849 struct ext4_sb_info *sbi = EXT4_SB(sb);
1850 struct ext4_super_block *es = sbi->s_es;
66acdcf4 1851 int def_errors, def_mount_opt = nodefs ? 0 : sbi->s_def_mount_opt;
5a916be1 1852 const struct mount_opts *m;
66acdcf4 1853 char sep = nodefs ? '\n' : ',';
2adf6da8 1854
66acdcf4
TT		 1855#define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep)
1856#define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg)
2adf6da8
TT		 1857
1858 if (sbi->s_sb_block != 1)
5a916be1
TT		 1859 SEQ_OPTS_PRINT("sb=%llu", sbi->s_sb_block);
1860
1861 for (m = ext4_mount_opts; m->token != Opt_err; m++) {
1862 int want_set = m->flags & MOPT_SET;
1863 if (((m->flags & (MOPT_SET|MOPT_CLEAR)) == 0) ||
1864 (m->flags & MOPT_CLEAR_ERR))
1865 continue;
66acdcf4 1866 if (!(m->mount_opt & (sbi->s_mount_opt ^ def_mount_opt)))
5a916be1
TT		 1867 continue; /* skip if same as the default */
1868 if ((want_set &&
1869 (sbi->s_mount_opt & m->mount_opt) != m->mount_opt) ||
1870 (!want_set && (sbi->s_mount_opt & m->mount_opt)))
1871 continue; /* select Opt_noFoo vs Opt_Foo */
1872 SEQ_OPTS_PRINT("%s", token2str(m->token));
2adf6da8 1873 }
5a916be1 1874
08cefc7a 1875 if (nodefs || !uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT4_DEF_RESUID)) ||
5a916be1 1876 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID)
08cefc7a
EB		 1877 SEQ_OPTS_PRINT("resuid=%u",
1878 from_kuid_munged(&init_user_ns, sbi->s_resuid));
1879 if (nodefs || !gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT4_DEF_RESGID)) ||
5a916be1 1880 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID)
08cefc7a
EB		 1881 SEQ_OPTS_PRINT("resgid=%u",
1882 from_kgid_munged(&init_user_ns, sbi->s_resgid));
66acdcf4 1883 def_errors = nodefs ? -1 : le16_to_cpu(es->s_errors);
5a916be1
TT		 1884 if (test_opt(sb, ERRORS_RO) && def_errors != EXT4_ERRORS_RO)
1885 SEQ_OPTS_PUTS("errors=remount-ro");
2adf6da8 1886 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
5a916be1 1887 SEQ_OPTS_PUTS("errors=continue");
2adf6da8 1888 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
5a916be1 1889 SEQ_OPTS_PUTS("errors=panic");
66acdcf4 1890 if (nodefs || sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ)
5a916be1 1891 SEQ_OPTS_PRINT("commit=%lu", sbi->s_commit_interval / HZ);
66acdcf4 1892 if (nodefs || sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME)
5a916be1 1893 SEQ_OPTS_PRINT("min_batch_time=%u", sbi->s_min_batch_time);
66acdcf4 1894 if (nodefs || sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME)
5a916be1 1895 SEQ_OPTS_PRINT("max_batch_time=%u", sbi->s_max_batch_time);
2adf6da8 1896 if (sb->s_flags & MS_I_VERSION)
5a916be1 1897 SEQ_OPTS_PUTS("i_version");
66acdcf4 1898 if (nodefs || sbi->s_stripe)
5a916be1 1899 SEQ_OPTS_PRINT("stripe=%lu", sbi->s_stripe);
66acdcf4 1900 if (EXT4_MOUNT_DATA_FLAGS & (sbi->s_mount_opt ^ def_mount_opt)) {
5a916be1
TT		 1901 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
1902 SEQ_OPTS_PUTS("data=journal");
1903 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
1904 SEQ_OPTS_PUTS("data=ordered");
1905 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
1906 SEQ_OPTS_PUTS("data=writeback");
1907 }
66acdcf4
TT		 1908 if (nodefs ||
1909 sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
5a916be1
TT		 1910 SEQ_OPTS_PRINT("inode_readahead_blks=%u",
1911 sbi->s_inode_readahead_blks);
2adf6da8 1912
66acdcf4
TT		 1913 if (nodefs || (test_opt(sb, INIT_INODE_TABLE) &&
1914 (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT)))
5a916be1 1915 SEQ_OPTS_PRINT("init_itable=%u", sbi->s_li_wait_mult);
df981d03
TT		 1916 if (nodefs || sbi->s_max_dir_size_kb)
1917 SEQ_OPTS_PRINT("max_dir_size_kb=%u", sbi->s_max_dir_size_kb);
2adf6da8
TT		 1918
1919 ext4_show_quota_options(seq, sb);
2adf6da8
TT		 1920 return 0;
1921}
1922
66acdcf4
TT		 1923static int ext4_show_options(struct seq_file *seq, struct dentry *root)
1924{
1925 return _ext4_show_options(seq, root->d_sb, 0);
1926}
1927
ebd173be 1928int ext4_seq_options_show(struct seq_file *seq, void *offset)
66acdcf4
TT		 1929{
1930 struct super_block *sb = seq->private;
1931 int rc;
1932
1933 seq_puts(seq, (sb->s_flags & MS_RDONLY) ? "ro" : "rw");
1934 rc = _ext4_show_options(seq, sb, 1);
1935 seq_puts(seq, "\n");
1936 return rc;
1937}
1938
617ba13b 1939static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
ac27a0ec
DK		 1940 int read_only)
1941{
617ba13b 1942 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec
DK		 1943 int res = 0;
1944
617ba13b 1945 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
b31e1552
ES		 1946 ext4_msg(sb, KERN_ERR, "revision level too high, "
1947 "forcing read-only mode");
ac27a0ec
DK		 1948 res = MS_RDONLY;
1949 }
1950 if (read_only)
281b5995 1951 goto done;
617ba13b 1952 if (!(sbi->s_mount_state & EXT4_VALID_FS))
b31e1552
ES		 1953 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
1954 "running e2fsck is recommended");
c8b459f4 1955 else if (sbi->s_mount_state & EXT4_ERROR_FS)
b31e1552
ES		 1956 ext4_msg(sb, KERN_WARNING,
1957 "warning: mounting fs with errors, "
1958 "running e2fsck is recommended");
ed3ce80a 1959 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
ac27a0ec
DK		 1960 le16_to_cpu(es->s_mnt_count) >=
1961 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
b31e1552
ES		 1962 ext4_msg(sb, KERN_WARNING,
1963 "warning: maximal mount count reached, "
1964 "running e2fsck is recommended");
ac27a0ec
DK		 1965 else if (le32_to_cpu(es->s_checkinterval) &&
1966 (le32_to_cpu(es->s_lastcheck) +
1967 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
b31e1552
ES		 1968 ext4_msg(sb, KERN_WARNING,
1969 "warning: checktime reached, "
1970 "running e2fsck is recommended");
0b8e58a1 1971 if (!sbi->s_journal)
0390131b 1972 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
ac27a0ec 1973 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
617ba13b 1974 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
e8546d06 1975 le16_add_cpu(&es->s_mnt_count, 1);
ac27a0ec 1976 es->s_mtime = cpu_to_le32(get_seconds());
617ba13b 1977 ext4_update_dynamic_rev(sb);
0390131b 1978 if (sbi->s_journal)
e2b911c5 1979 ext4_set_feature_journal_needs_recovery(sb);
ac27a0ec 1980
e2d67052 1981 ext4_commit_super(sb, 1);
281b5995 1982done:
ac27a0ec 1983 if (test_opt(sb, DEBUG))
a9df9a49 1984 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
a2595b8a 1985 "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
ac27a0ec
DK		 1986 sb->s_blocksize,
1987 sbi->s_groups_count,
617ba13b
MC		 1988 EXT4_BLOCKS_PER_GROUP(sb),
1989 EXT4_INODES_PER_GROUP(sb),
a2595b8a 1990 sbi->s_mount_opt, sbi->s_mount_opt2);
ac27a0ec 1991
7abc52c2 1992 cleancache_init_fs(sb);
ac27a0ec
DK		 1993 return res;
1994}
1995
117fff10
TT		 1996int ext4_alloc_flex_bg_array(struct super_block *sb, ext4_group_t ngroup)
1997{
1998 struct ext4_sb_info *sbi = EXT4_SB(sb);
1999 struct flex_groups *new_groups;
2000 int size;
2001
2002 if (!sbi->s_log_groups_per_flex)
2003 return 0;
2004
2005 size = ext4_flex_group(sbi, ngroup - 1) + 1;
2006 if (size <= sbi->s_flex_groups_allocated)
2007 return 0;
2008
2009 size = roundup_pow_of_two(size * sizeof(struct flex_groups));
2010 new_groups = ext4_kvzalloc(size, GFP_KERNEL);
2011 if (!new_groups) {
2012 ext4_msg(sb, KERN_ERR, "not enough memory for %d flex groups",
2013 size / (int) sizeof(struct flex_groups));
2014 return -ENOMEM;
2015 }
2016
2017 if (sbi->s_flex_groups) {
2018 memcpy(new_groups, sbi->s_flex_groups,
2019 (sbi->s_flex_groups_allocated *
2020 sizeof(struct flex_groups)));
b93b41d4 2021 kvfree(sbi->s_flex_groups);
117fff10
TT		 2022 }
2023 sbi->s_flex_groups = new_groups;
2024 sbi->s_flex_groups_allocated = size / sizeof(struct flex_groups);
2025 return 0;
2026}
2027
772cb7c8
JS		 2028static int ext4_fill_flex_info(struct super_block *sb)
2029{
2030 struct ext4_sb_info *sbi = EXT4_SB(sb);
2031 struct ext4_group_desc *gdp = NULL;
772cb7c8 2032 ext4_group_t flex_group;
117fff10 2033 int i, err;
772cb7c8 2034
503358ae 2035 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
d50f2ab6 2036 if (sbi->s_log_groups_per_flex < 1 || sbi->s_log_groups_per_flex > 31) {
772cb7c8
JS		 2037 sbi->s_log_groups_per_flex = 0;
2038 return 1;
2039 }
2040
117fff10
TT		 2041 err = ext4_alloc_flex_bg_array(sb, sbi->s_groups_count);
2042 if (err)
9933fc0a 2043 goto failed;
772cb7c8 2044
772cb7c8 2045 for (i = 0; i < sbi->s_groups_count; i++) {
88b6edd1 2046 gdp = ext4_get_group_desc(sb, i, NULL);
772cb7c8
JS		 2047
2048 flex_group = ext4_flex_group(sbi, i);
7ad9bb65
TT		 2049 atomic_add(ext4_free_inodes_count(sb, gdp),
2050 &sbi->s_flex_groups[flex_group].free_inodes);
90ba983f
TT		 2051 atomic64_add(ext4_free_group_clusters(sb, gdp),
2052 &sbi->s_flex_groups[flex_group].free_clusters);
7ad9bb65
TT		 2053 atomic_add(ext4_used_dirs_count(sb, gdp),
2054 &sbi->s_flex_groups[flex_group].used_dirs);
772cb7c8
JS		 2055 }
2056
2057 return 1;
2058failed:
2059 return 0;
2060}
2061
e2b911c5 2062static __le16 ext4_group_desc_csum(struct super_block *sb, __u32 block_group,
feb0ab32 2063 struct ext4_group_desc *gdp)
717d50e4 2064{
feb0ab32 2065 int offset;
717d50e4 2066 __u16 crc = 0;
feb0ab32 2067 __le32 le_group = cpu_to_le32(block_group);
e2b911c5 2068 struct ext4_sb_info *sbi = EXT4_SB(sb);
717d50e4 2069
9aa5d32b 2070 if (ext4_has_metadata_csum(sbi->s_sb)) {
feb0ab32 2071 /* Use new metadata_csum algorithm */
d6a77105 2072 __le16 save_csum;
feb0ab32
DW		 2073 __u32 csum32;
2074
d6a77105 2075 save_csum = gdp->bg_checksum;
feb0ab32
DW		 2076 gdp->bg_checksum = 0;
2077 csum32 = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&le_group,
2078 sizeof(le_group));
2079 csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp,
2080 sbi->s_desc_size);
d6a77105 2081 gdp->bg_checksum = save_csum;
feb0ab32
DW		 2082
2083 crc = csum32 & 0xFFFF;
2084 goto out;
717d50e4
AD		 2085 }
2086
feb0ab32 2087 /* old crc16 code */
e2b911c5 2088 if (!ext4_has_feature_gdt_csum(sb))
813d32f9
DW		 2089 return 0;
2090
feb0ab32
DW		 2091 offset = offsetof(struct ext4_group_desc, bg_checksum);
2092
2093 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
2094 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
2095 crc = crc16(crc, (__u8 *)gdp, offset);
2096 offset += sizeof(gdp->bg_checksum); /* skip checksum */
2097 /* for checksum of struct ext4_group_desc do the rest...*/
e2b911c5 2098 if (ext4_has_feature_64bit(sb) &&
feb0ab32
DW		 2099 offset < le16_to_cpu(sbi->s_es->s_desc_size))
2100 crc = crc16(crc, (__u8 *)gdp + offset,
2101 le16_to_cpu(sbi->s_es->s_desc_size) -
2102 offset);
2103
2104out:
717d50e4
AD		 2105 return cpu_to_le16(crc);
2106}
2107
feb0ab32 2108int ext4_group_desc_csum_verify(struct super_block *sb, __u32 block_group,
717d50e4
AD		 2109 struct ext4_group_desc *gdp)
2110{
feb0ab32 2111 if (ext4_has_group_desc_csum(sb) &&
e2b911c5 2112 (gdp->bg_checksum != ext4_group_desc_csum(sb, block_group, gdp)))
717d50e4
AD		 2113 return 0;
2114
2115 return 1;
2116}
2117
feb0ab32
DW		 2118void ext4_group_desc_csum_set(struct super_block *sb, __u32 block_group,
2119 struct ext4_group_desc *gdp)
2120{
2121 if (!ext4_has_group_desc_csum(sb))
2122 return;
e2b911c5 2123 gdp->bg_checksum = ext4_group_desc_csum(sb, block_group, gdp);
feb0ab32
DW		 2124}
2125
ac27a0ec 2126/* Called at mount-time, super-block is locked */
bfff6873
LC		 2127static int ext4_check_descriptors(struct super_block *sb,
2128 ext4_group_t *first_not_zeroed)
ac27a0ec 2129{
617ba13b
MC		 2130 struct ext4_sb_info *sbi = EXT4_SB(sb);
2131 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
2132 ext4_fsblk_t last_block;
bd81d8ee
LV		 2133 ext4_fsblk_t block_bitmap;
2134 ext4_fsblk_t inode_bitmap;
2135 ext4_fsblk_t inode_table;
ce421581 2136 int flexbg_flag = 0;
bfff6873 2137 ext4_group_t i, grp = sbi->s_groups_count;
ac27a0ec 2138
e2b911c5 2139 if (ext4_has_feature_flex_bg(sb))
ce421581
JS		 2140 flexbg_flag = 1;
2141
af5bc92d 2142 ext4_debug("Checking group descriptors");
ac27a0ec 2143
197cd65a
AM		 2144 for (i = 0; i < sbi->s_groups_count; i++) {
2145 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
2146
ce421581 2147 if (i == sbi->s_groups_count - 1 || flexbg_flag)
bd81d8ee 2148 last_block = ext4_blocks_count(sbi->s_es) - 1;
ac27a0ec
DK		 2149 else
2150 last_block = first_block +
617ba13b 2151 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
ac27a0ec 2152
bfff6873
LC		 2153 if ((grp == sbi->s_groups_count) &&
2154 !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2155 grp = i;
2156
8fadc143 2157 block_bitmap = ext4_block_bitmap(sb, gdp);
2b2d6d01 2158 if (block_bitmap < first_block || block_bitmap > last_block) {
b31e1552 2159 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2160 "Block bitmap for group %u not in group "
b31e1552 2161 "(block %llu)!", i, block_bitmap);
ac27a0ec
DK		 2162 return 0;
2163 }
8fadc143 2164 inode_bitmap = ext4_inode_bitmap(sb, gdp);
2b2d6d01 2165 if (inode_bitmap < first_block || inode_bitmap > last_block) {
b31e1552 2166 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2167 "Inode bitmap for group %u not in group "
b31e1552 2168 "(block %llu)!", i, inode_bitmap);
ac27a0ec
DK		 2169 return 0;
2170 }
8fadc143 2171 inode_table = ext4_inode_table(sb, gdp);
bd81d8ee 2172 if (inode_table < first_block ||
2b2d6d01 2173 inode_table + sbi->s_itb_per_group - 1 > last_block) {
b31e1552 2174 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2175 "Inode table for group %u not in group "
b31e1552 2176 "(block %llu)!", i, inode_table);
ac27a0ec
DK		 2177 return 0;
2178 }
955ce5f5 2179 ext4_lock_group(sb, i);
feb0ab32 2180 if (!ext4_group_desc_csum_verify(sb, i, gdp)) {
b31e1552
ES		 2181 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2182 "Checksum for group %u failed (%u!=%u)",
e2b911c5 2183 i, le16_to_cpu(ext4_group_desc_csum(sb, i,
b31e1552 2184 gdp)), le16_to_cpu(gdp->bg_checksum));
7ee1ec4c 2185 if (!(sb->s_flags & MS_RDONLY)) {
955ce5f5 2186 ext4_unlock_group(sb, i);
8a266467 2187 return 0;
7ee1ec4c 2188 }
717d50e4 2189 }
955ce5f5 2190 ext4_unlock_group(sb, i);
ce421581
JS		 2191 if (!flexbg_flag)
2192 first_block += EXT4_BLOCKS_PER_GROUP(sb);
ac27a0ec 2193 }
bfff6873
LC		 2194 if (NULL != first_not_zeroed)
2195 *first_not_zeroed = grp;
ac27a0ec
DK		 2196 return 1;
2197}
2198
617ba13b 2199/* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
ac27a0ec
DK		 2200 * the superblock) which were deleted from all directories, but held open by
2201 * a process at the time of a crash. We walk the list and try to delete these
2202 * inodes at recovery time (only with a read-write filesystem).
2203 *
2204 * In order to keep the orphan inode chain consistent during traversal (in
2205 * case of crash during recovery), we link each inode into the superblock
2206 * orphan list_head and handle it the same way as an inode deletion during
2207 * normal operation (which journals the operations for us).
2208 *
2209 * We only do an iget() and an iput() on each inode, which is very safe if we
2210 * accidentally point at an in-use or already deleted inode. The worst that
2211 * can happen in this case is that we get a "bit already cleared" message from
617ba13b 2212 * ext4_free_inode(). The only reason we would point at a wrong inode is if
ac27a0ec
DK		 2213 * e2fsck was run on this filesystem, and it must have already done the orphan
2214 * inode cleanup for us, so we can safely abort without any further action.
2215 */
2b2d6d01
TT		 2216static void ext4_orphan_cleanup(struct super_block *sb,
2217 struct ext4_super_block *es)
ac27a0ec
DK		 2218{
2219 unsigned int s_flags = sb->s_flags;
2220 int nr_orphans = 0, nr_truncates = 0;
2221#ifdef CONFIG_QUOTA
2222 int i;
2223#endif
2224 if (!es->s_last_orphan) {
2225 jbd_debug(4, "no orphan inodes to clean up\n");
2226 return;
2227 }
2228
a8f48a95 2229 if (bdev_read_only(sb->s_bdev)) {
b31e1552
ES		 2230 ext4_msg(sb, KERN_ERR, "write access "
2231 "unavailable, skipping orphan cleanup");
a8f48a95
ES		 2232 return;
2233 }
2234
d39195c3
AG		 2235 /* Check if feature set would not allow a r/w mount */
2236 if (!ext4_feature_set_ok(sb, 0)) {
2237 ext4_msg(sb, KERN_INFO, "Skipping orphan cleanup due to "
2238 "unknown ROCOMPAT features");
2239 return;
2240 }
2241
617ba13b 2242 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
c25f9bc6
ES		 2243 /* don't clear list on RO mount w/ errors */
2244 if (es->s_last_orphan && !(s_flags & MS_RDONLY)) {
84474976 2245 ext4_msg(sb, KERN_INFO, "Errors on filesystem, "
ac27a0ec 2246 "clearing orphan list.\n");
c25f9bc6
ES		 2247 es->s_last_orphan = 0;
2248 }
ac27a0ec
DK		 2249 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2250 return;
2251 }
2252
2253 if (s_flags & MS_RDONLY) {
b31e1552 2254 ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
ac27a0ec
DK		 2255 sb->s_flags &= ~MS_RDONLY;
2256 }
2257#ifdef CONFIG_QUOTA
2258 /* Needed for iput() to work correctly and not trash data */
2259 sb->s_flags |= MS_ACTIVE;
2260 /* Turn on quotas so that they are updated correctly */
a2d4a646 2261 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
617ba13b
MC		 2262 if (EXT4_SB(sb)->s_qf_names[i]) {
2263 int ret = ext4_quota_on_mount(sb, i);
ac27a0ec 2264 if (ret < 0)
b31e1552
ES		 2265 ext4_msg(sb, KERN_ERR,
2266 "Cannot turn on journaled "
2267 "quota: error %d", ret);
ac27a0ec
DK		 2268 }
2269 }
2270#endif
2271
2272 while (es->s_last_orphan) {
2273 struct inode *inode;
2274
97bd42b9
JB		 2275 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
2276 if (IS_ERR(inode)) {
ac27a0ec
DK		 2277 es->s_last_orphan = 0;
2278 break;
2279 }
2280
617ba13b 2281 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
871a2931 2282 dquot_initialize(inode);
ac27a0ec 2283 if (inode->i_nlink) {
566370a2
PT		 2284 if (test_opt(sb, DEBUG))
2285 ext4_msg(sb, KERN_DEBUG,
2286 "%s: truncating inode %lu to %lld bytes",
2287 __func__, inode->i_ino, inode->i_size);
e5f8eab8 2288 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
ac27a0ec 2289 inode->i_ino, inode->i_size);
5955102c 2290 inode_lock(inode);
55f252c9 2291 truncate_inode_pages(inode->i_mapping, inode->i_size);
617ba13b 2292 ext4_truncate(inode);
5955102c 2293 inode_unlock(inode);
ac27a0ec
DK		 2294 nr_truncates++;
2295 } else {
566370a2
PT		 2296 if (test_opt(sb, DEBUG))
2297 ext4_msg(sb, KERN_DEBUG,
2298 "%s: deleting unreferenced inode %lu",
2299 __func__, inode->i_ino);
ac27a0ec
DK		 2300 jbd_debug(2, "deleting unreferenced inode %lu\n",
2301 inode->i_ino);
2302 nr_orphans++;
2303 }
2304 iput(inode); /* The delete magic happens here! */
2305 }
2306
2b2d6d01 2307#define PLURAL(x) (x), ((x) == 1) ? "" : "s"
ac27a0ec
DK		 2308
2309 if (nr_orphans)
b31e1552
ES		 2310 ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
2311 PLURAL(nr_orphans));
ac27a0ec 2312 if (nr_truncates)
b31e1552
ES		 2313 ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
2314 PLURAL(nr_truncates));
ac27a0ec
DK		 2315#ifdef CONFIG_QUOTA
2316 /* Turn quotas off */
a2d4a646 2317 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
ac27a0ec 2318 if (sb_dqopt(sb)->files[i])
287a8095 2319 dquot_quota_off(sb, i);
ac27a0ec
DK		 2320 }
2321#endif
2322 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
2323}
0b8e58a1 2324
cd2291a4
ES		 2325/*
2326 * Maximal extent format file size.
2327 * Resulting logical blkno at s_maxbytes must fit in our on-disk
2328 * extent format containers, within a sector_t, and within i_blocks
2329 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
2330 * so that won't be a limiting factor.
2331 *
f17722f9
LC		 2332 * However there is other limiting factor. We do store extents in the form
2333 * of starting block and length, hence the resulting length of the extent
2334 * covering maximum file size must fit into on-disk format containers as
2335 * well. Given that length is always by 1 unit bigger than max unit (because
2336 * we count 0 as well) we have to lower the s_maxbytes by one fs block.
2337 *
cd2291a4
ES		 2338 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
2339 */
f287a1a5 2340static loff_t ext4_max_size(int blkbits, int has_huge_files)
cd2291a4
ES		 2341{
2342 loff_t res;
2343 loff_t upper_limit = MAX_LFS_FILESIZE;
2344
2345 /* small i_blocks in vfs inode? */
f287a1a5 2346 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
cd2291a4 2347 /*
90c699a9 2348 * CONFIG_LBDAF is not enabled implies the inode
cd2291a4
ES		 2349 * i_block represent total blocks in 512 bytes
2350 * 32 == size of vfs inode i_blocks * 8
2351 */
2352 upper_limit = (1LL << 32) - 1;
2353
2354 /* total blocks in file system block size */
2355 upper_limit >>= (blkbits - 9);
2356 upper_limit <<= blkbits;
2357 }
2358
f17722f9
LC		 2359 /*
2360 * 32-bit extent-start container, ee_block. We lower the maxbytes
2361 * by one fs block, so ee_len can cover the extent of maximum file
2362 * size
2363 */
2364 res = (1LL << 32) - 1;
cd2291a4 2365 res <<= blkbits;
cd2291a4
ES		 2366
2367 /* Sanity check against vm- & vfs- imposed limits */
2368 if (res > upper_limit)
2369 res = upper_limit;
2370
2371 return res;
2372}
ac27a0ec 2373
ac27a0ec 2374/*
cd2291a4 2375 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
0fc1b451
AK		 2376 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2377 * We need to be 1 filesystem block less than the 2^48 sector limit.
ac27a0ec 2378 */
f287a1a5 2379static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
ac27a0ec 2380{
617ba13b 2381 loff_t res = EXT4_NDIR_BLOCKS;
0fc1b451
AK		 2382 int meta_blocks;
2383 loff_t upper_limit;
0b8e58a1
AD		 2384 /* This is calculated to be the largest file size for a dense, block
2385 * mapped file such that the file's total number of 512-byte sectors,
2386 * including data and all indirect blocks, does not exceed (2^48 - 1).
2387 *
2388 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2389 * number of 512-byte sectors of the file.
0fc1b451
AK		 2390 */
2391
f287a1a5 2392 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
0fc1b451 2393 /*
90c699a9 2394 * !has_huge_files or CONFIG_LBDAF not enabled implies that
0b8e58a1
AD		 2395 * the inode i_block field represents total file blocks in
2396 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
0fc1b451
AK		 2397 */
2398 upper_limit = (1LL << 32) - 1;
2399
2400 /* total blocks in file system block size */
2401 upper_limit >>= (bits - 9);
2402
2403 } else {
8180a562
AK		 2404 /*
2405 * We use 48 bit ext4_inode i_blocks
2406 * With EXT4_HUGE_FILE_FL set the i_blocks
2407 * represent total number of blocks in
2408 * file system block size
2409 */
0fc1b451
AK		 2410 upper_limit = (1LL << 48) - 1;
2411
0fc1b451
AK		 2412 }
2413
2414 /* indirect blocks */
2415 meta_blocks = 1;
2416 /* double indirect blocks */
2417 meta_blocks += 1 + (1LL << (bits-2));
2418 /* tripple indirect blocks */
2419 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
2420
2421 upper_limit -= meta_blocks;
2422 upper_limit <<= bits;
ac27a0ec
DK		 2423
2424 res += 1LL << (bits-2);
2425 res += 1LL << (2*(bits-2));
2426 res += 1LL << (3*(bits-2));
2427 res <<= bits;
2428 if (res > upper_limit)
2429 res = upper_limit;
0fc1b451
AK		 2430
2431 if (res > MAX_LFS_FILESIZE)
2432 res = MAX_LFS_FILESIZE;
2433
ac27a0ec
DK		 2434 return res;
2435}
2436
617ba13b 2437static ext4_fsblk_t descriptor_loc(struct super_block *sb,
0b8e58a1 2438 ext4_fsblk_t logical_sb_block, int nr)
ac27a0ec 2439{
617ba13b 2440 struct ext4_sb_info *sbi = EXT4_SB(sb);
fd2d4291 2441 ext4_group_t bg, first_meta_bg;
ac27a0ec
DK		 2442 int has_super = 0;
2443
2444 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
2445
e2b911c5 2446 if (!ext4_has_feature_meta_bg(sb) || nr < first_meta_bg)
70bbb3e0 2447 return logical_sb_block + nr + 1;
ac27a0ec 2448 bg = sbi->s_desc_per_block * nr;
617ba13b 2449 if (ext4_bg_has_super(sb, bg))
ac27a0ec 2450 has_super = 1;
0b8e58a1 2451
bd63f6b0
DW		 2452 /*
2453 * If we have a meta_bg fs with 1k blocks, group 0's GDT is at
2454 * block 2, not 1. If s_first_data_block == 0 (bigalloc is enabled
2455 * on modern mke2fs or blksize > 1k on older mke2fs) then we must
2456 * compensate.
2457 */
2458 if (sb->s_blocksize == 1024 && nr == 0 &&
2459 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block) == 0)
2460 has_super++;
2461
617ba13b 2462 return (has_super + ext4_group_first_block_no(sb, bg));
ac27a0ec
DK		 2463}
2464
c9de560d
AT		 2465/**
2466 * ext4_get_stripe_size: Get the stripe size.
2467 * @sbi: In memory super block info
2468 *
2469 * If we have specified it via mount option, then
2470 * use the mount option value. If the value specified at mount time is
2471 * greater than the blocks per group use the super block value.
2472 * If the super block value is greater than blocks per group return 0.
2473 * Allocator needs it be less than blocks per group.
2474 *
2475 */
2476static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
2477{
2478 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
2479 unsigned long stripe_width =
2480 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
3eb08658 2481 int ret;
c9de560d
AT		 2482
2483 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
3eb08658
DE		 2484 ret = sbi->s_stripe;
2485 else if (stripe_width <= sbi->s_blocks_per_group)
2486 ret = stripe_width;
2487 else if (stride <= sbi->s_blocks_per_group)
2488 ret = stride;
2489 else
2490 ret = 0;
c9de560d 2491
3eb08658
DE		 2492 /*
2493 * If the stripe width is 1, this makes no sense and
2494 * we set it to 0 to turn off stripe handling code.
2495 */
2496 if (ret <= 1)
2497 ret = 0;
c9de560d 2498
3eb08658 2499 return ret;
c9de560d 2500}
ac27a0ec 2501
a13fb1a4
ES		 2502/*
2503 * Check whether this filesystem can be mounted based on
2504 * the features present and the RDONLY/RDWR mount requested.
2505 * Returns 1 if this filesystem can be mounted as requested,
2506 * 0 if it cannot be.
2507 */
2508static int ext4_feature_set_ok(struct super_block *sb, int readonly)
2509{
e2b911c5 2510 if (ext4_has_unknown_ext4_incompat_features(sb)) {
a13fb1a4
ES		 2511 ext4_msg(sb, KERN_ERR,
2512 "Couldn't mount because of "
2513 "unsupported optional features (%x)",
2514 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
2515 ~EXT4_FEATURE_INCOMPAT_SUPP));
2516 return 0;
2517 }
2518
2519 if (readonly)
2520 return 1;
2521
e2b911c5 2522 if (ext4_has_feature_readonly(sb)) {
2cb5cc8b
DW		 2523 ext4_msg(sb, KERN_INFO, "filesystem is read-only");
2524 sb->s_flags |= MS_RDONLY;
2525 return 1;
2526 }
2527
a13fb1a4 2528 /* Check that feature set is OK for a read-write mount */
e2b911c5 2529 if (ext4_has_unknown_ext4_ro_compat_features(sb)) {
a13fb1a4
ES		 2530 ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of "
2531 "unsupported optional features (%x)",
2532 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
2533 ~EXT4_FEATURE_RO_COMPAT_SUPP));
2534 return 0;
2535 }
2536 /*
2537 * Large file size enabled file system can only be mounted
2538 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
2539 */
e2b911c5 2540 if (ext4_has_feature_huge_file(sb)) {
a13fb1a4
ES		 2541 if (sizeof(blkcnt_t) < sizeof(u64)) {
2542 ext4_msg(sb, KERN_ERR, "Filesystem with huge files "
2543 "cannot be mounted RDWR without "
2544 "CONFIG_LBDAF");
2545 return 0;
2546 }
2547 }
e2b911c5 2548 if (ext4_has_feature_bigalloc(sb) && !ext4_has_feature_extents(sb)) {
bab08ab9
TT		 2549 ext4_msg(sb, KERN_ERR,
2550 "Can't support bigalloc feature without "
2551 "extents feature\n");
2552 return 0;
2553 }
7c319d32
AK		 2554
2555#ifndef CONFIG_QUOTA
e2b911c5 2556 if (ext4_has_feature_quota(sb) && !readonly) {
7c319d32
AK		 2557 ext4_msg(sb, KERN_ERR,
2558 "Filesystem with quota feature cannot be mounted RDWR "
2559 "without CONFIG_QUOTA");
2560 return 0;
2561 }
689c958c
LX		 2562 if (ext4_has_feature_project(sb) && !readonly) {
2563 ext4_msg(sb, KERN_ERR,
2564 "Filesystem with project quota feature cannot be mounted RDWR "
2565 "without CONFIG_QUOTA");
2566 return 0;
2567 }
7c319d32 2568#endif /* CONFIG_QUOTA */
a13fb1a4
ES		 2569 return 1;
2570}
2571
66e61a9e
TT		 2572/*
2573 * This function is called once a day if we have errors logged
2574 * on the file system
2575 */
2576static void print_daily_error_info(unsigned long arg)
2577{
2578 struct super_block *sb = (struct super_block *) arg;
2579 struct ext4_sb_info *sbi;
2580 struct ext4_super_block *es;
2581
2582 sbi = EXT4_SB(sb);
2583 es = sbi->s_es;
2584
2585 if (es->s_error_count)
ae0f78de
TT		 2586 /* fsck newer than v1.41.13 is needed to clean this condition. */
2587 ext4_msg(sb, KERN_NOTICE, "error count since last fsck: %u",
66e61a9e
TT		 2588 le32_to_cpu(es->s_error_count));
2589 if (es->s_first_error_time) {
ae0f78de 2590 printk(KERN_NOTICE "EXT4-fs (%s): initial error at time %u: %.*s:%d",
66e61a9e
TT		 2591 sb->s_id, le32_to_cpu(es->s_first_error_time),
2592 (int) sizeof(es->s_first_error_func),
2593 es->s_first_error_func,
2594 le32_to_cpu(es->s_first_error_line));
2595 if (es->s_first_error_ino)
2596 printk(": inode %u",
2597 le32_to_cpu(es->s_first_error_ino));
2598 if (es->s_first_error_block)
2599 printk(": block %llu", (unsigned long long)
2600 le64_to_cpu(es->s_first_error_block));
2601 printk("\n");
2602 }
2603 if (es->s_last_error_time) {
ae0f78de 2604 printk(KERN_NOTICE "EXT4-fs (%s): last error at time %u: %.*s:%d",
66e61a9e
TT		 2605 sb->s_id, le32_to_cpu(es->s_last_error_time),
2606 (int) sizeof(es->s_last_error_func),
2607 es->s_last_error_func,
2608 le32_to_cpu(es->s_last_error_line));
2609 if (es->s_last_error_ino)
2610 printk(": inode %u",
2611 le32_to_cpu(es->s_last_error_ino));
2612 if (es->s_last_error_block)
2613 printk(": block %llu", (unsigned long long)
2614 le64_to_cpu(es->s_last_error_block));
2615 printk("\n");
2616 }
2617 mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ); /* Once a day */
2618}
2619
bfff6873
LC		 2620/* Find next suitable group and run ext4_init_inode_table */
2621static int ext4_run_li_request(struct ext4_li_request *elr)
2622{
2623 struct ext4_group_desc *gdp = NULL;
2624 ext4_group_t group, ngroups;
2625 struct super_block *sb;
2626 unsigned long timeout = 0;
2627 int ret = 0;
2628
2629 sb = elr->lr_super;
2630 ngroups = EXT4_SB(sb)->s_groups_count;
2631
8e8ad8a5 2632 sb_start_write(sb);
bfff6873
LC		 2633 for (group = elr->lr_next_group; group < ngroups; group++) {
2634 gdp = ext4_get_group_desc(sb, group, NULL);
2635 if (!gdp) {
2636 ret = 1;
2637 break;
2638 }
2639
2640 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2641 break;
2642 }
2643
7f511862 2644 if (group >= ngroups)
bfff6873
LC		 2645 ret = 1;
2646
2647 if (!ret) {
2648 timeout = jiffies;
2649 ret = ext4_init_inode_table(sb, group,
2650 elr->lr_timeout ? 0 : 1);
2651 if (elr->lr_timeout == 0) {
51ce6511
LC		 2652 timeout = (jiffies - timeout) *
2653 elr->lr_sbi->s_li_wait_mult;
bfff6873
LC		 2654 elr->lr_timeout = timeout;
2655 }
2656 elr->lr_next_sched = jiffies + elr->lr_timeout;
2657 elr->lr_next_group = group + 1;
2658 }
8e8ad8a5 2659 sb_end_write(sb);
bfff6873
LC		 2660
2661 return ret;
2662}
2663
2664/*
2665 * Remove lr_request from the list_request and free the
4ed5c033 2666 * request structure. Should be called with li_list_mtx held
bfff6873
LC		 2667 */
2668static void ext4_remove_li_request(struct ext4_li_request *elr)
2669{
2670 struct ext4_sb_info *sbi;
2671
2672 if (!elr)
2673 return;
2674
2675 sbi = elr->lr_sbi;
2676
2677 list_del(&elr->lr_request);
2678 sbi->s_li_request = NULL;
2679 kfree(elr);
2680}
2681
2682static void ext4_unregister_li_request(struct super_block *sb)
2683{
1bb933fb
LC		 2684 mutex_lock(&ext4_li_mtx);
2685 if (!ext4_li_info) {
2686 mutex_unlock(&ext4_li_mtx);
bfff6873 2687 return;
1bb933fb 2688 }
bfff6873
LC		 2689
2690 mutex_lock(&ext4_li_info->li_list_mtx);
1bb933fb 2691 ext4_remove_li_request(EXT4_SB(sb)->s_li_request);
bfff6873 2692 mutex_unlock(&ext4_li_info->li_list_mtx);
1bb933fb 2693 mutex_unlock(&ext4_li_mtx);
bfff6873
LC		 2694}
2695
8f1f7453
ES		 2696static struct task_struct *ext4_lazyinit_task;
2697
bfff6873
LC		 2698/*
2699 * This is the function where ext4lazyinit thread lives. It walks
2700 * through the request list searching for next scheduled filesystem.
2701 * When such a fs is found, run the lazy initialization request
2702 * (ext4_rn_li_request) and keep track of the time spend in this
2703 * function. Based on that time we compute next schedule time of
2704 * the request. When walking through the list is complete, compute
2705 * next waking time and put itself into sleep.
2706 */
2707static int ext4_lazyinit_thread(void *arg)
2708{
2709 struct ext4_lazy_init *eli = (struct ext4_lazy_init *)arg;
2710 struct list_head *pos, *n;
2711 struct ext4_li_request *elr;
4ed5c033 2712 unsigned long next_wakeup, cur;
bfff6873
LC		 2713
2714 BUG_ON(NULL == eli);
2715
bfff6873
LC		 2716cont_thread:
2717 while (true) {
2718 next_wakeup = MAX_JIFFY_OFFSET;
2719
2720 mutex_lock(&eli->li_list_mtx);
2721 if (list_empty(&eli->li_request_list)) {
2722 mutex_unlock(&eli->li_list_mtx);
2723 goto exit_thread;
2724 }
2725
2726 list_for_each_safe(pos, n, &eli->li_request_list) {
2727 elr = list_entry(pos, struct ext4_li_request,
2728 lr_request);
2729
b2c78cd0
TT		 2730 if (time_after_eq(jiffies, elr->lr_next_sched)) {
2731 if (ext4_run_li_request(elr) != 0) {
2732 /* error, remove the lazy_init job */
2733 ext4_remove_li_request(elr);
2734 continue;
2735 }
bfff6873
LC		 2736 }
2737
2738 if (time_before(elr->lr_next_sched, next_wakeup))
2739 next_wakeup = elr->lr_next_sched;
2740 }
2741 mutex_unlock(&eli->li_list_mtx);
2742
a0acae0e 2743 try_to_freeze();
bfff6873 2744
4ed5c033
LC		 2745 cur = jiffies;
2746 if ((time_after_eq(cur, next_wakeup)) ||
f4245bd4 2747 (MAX_JIFFY_OFFSET == next_wakeup)) {
bfff6873
LC		 2748 cond_resched();
2749 continue;
2750 }
2751
4ed5c033
LC		 2752 schedule_timeout_interruptible(next_wakeup - cur);
2753
8f1f7453
ES		 2754 if (kthread_should_stop()) {
2755 ext4_clear_request_list();
2756 goto exit_thread;
2757 }
bfff6873
LC		 2758 }
2759
2760exit_thread:
2761 /*
2762 * It looks like the request list is empty, but we need
2763 * to check it under the li_list_mtx lock, to prevent any
2764 * additions into it, and of course we should lock ext4_li_mtx
2765 * to atomically free the list and ext4_li_info, because at
2766 * this point another ext4 filesystem could be registering
2767 * new one.
2768 */
2769 mutex_lock(&ext4_li_mtx);
2770 mutex_lock(&eli->li_list_mtx);
2771 if (!list_empty(&eli->li_request_list)) {
2772 mutex_unlock(&eli->li_list_mtx);
2773 mutex_unlock(&ext4_li_mtx);
2774 goto cont_thread;
2775 }
2776 mutex_unlock(&eli->li_list_mtx);
bfff6873
LC		 2777 kfree(ext4_li_info);
2778 ext4_li_info = NULL;
2779 mutex_unlock(&ext4_li_mtx);
2780
2781 return 0;
2782}
2783
2784static void ext4_clear_request_list(void)
2785{
2786 struct list_head *pos, *n;
2787 struct ext4_li_request *elr;
2788
2789 mutex_lock(&ext4_li_info->li_list_mtx);
bfff6873
LC		 2790 list_for_each_safe(pos, n, &ext4_li_info->li_request_list) {
2791 elr = list_entry(pos, struct ext4_li_request,
2792 lr_request);
2793 ext4_remove_li_request(elr);
2794 }
2795 mutex_unlock(&ext4_li_info->li_list_mtx);
2796}
2797
2798static int ext4_run_lazyinit_thread(void)
2799{
8f1f7453
ES		 2800 ext4_lazyinit_task = kthread_run(ext4_lazyinit_thread,
2801 ext4_li_info, "ext4lazyinit");
2802 if (IS_ERR(ext4_lazyinit_task)) {
2803 int err = PTR_ERR(ext4_lazyinit_task);
bfff6873 2804 ext4_clear_request_list();
bfff6873
LC		 2805 kfree(ext4_li_info);
2806 ext4_li_info = NULL;
92b97816 2807 printk(KERN_CRIT "EXT4-fs: error %d creating inode table "
bfff6873
LC		 2808 "initialization thread\n",
2809 err);
2810 return err;
2811 }
2812 ext4_li_info->li_state |= EXT4_LAZYINIT_RUNNING;
bfff6873
LC		 2813 return 0;
2814}
2815
2816/*
2817 * Check whether it make sense to run itable init. thread or not.
2818 * If there is at least one uninitialized inode table, return
2819 * corresponding group number, else the loop goes through all
2820 * groups and return total number of groups.
2821 */
2822static ext4_group_t ext4_has_uninit_itable(struct super_block *sb)
2823{
2824 ext4_group_t group, ngroups = EXT4_SB(sb)->s_groups_count;
2825 struct ext4_group_desc *gdp = NULL;
2826
2827 for (group = 0; group < ngroups; group++) {
2828 gdp = ext4_get_group_desc(sb, group, NULL);
2829 if (!gdp)
2830 continue;
2831
2832 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2833 break;
2834 }
2835
2836 return group;
2837}
2838
2839static int ext4_li_info_new(void)
2840{
2841 struct ext4_lazy_init *eli = NULL;
2842
2843 eli = kzalloc(sizeof(*eli), GFP_KERNEL);
2844 if (!eli)
2845 return -ENOMEM;
2846
bfff6873
LC		 2847 INIT_LIST_HEAD(&eli->li_request_list);
2848 mutex_init(&eli->li_list_mtx);
2849
bfff6873
LC		 2850 eli->li_state |= EXT4_LAZYINIT_QUIT;
2851
2852 ext4_li_info = eli;
2853
2854 return 0;
2855}
2856
2857static struct ext4_li_request *ext4_li_request_new(struct super_block *sb,
2858 ext4_group_t start)
2859{
2860 struct ext4_sb_info *sbi = EXT4_SB(sb);
2861 struct ext4_li_request *elr;
bfff6873
LC		 2862
2863 elr = kzalloc(sizeof(*elr), GFP_KERNEL);
2864 if (!elr)
2865 return NULL;
2866
2867 elr->lr_super = sb;
2868 elr->lr_sbi = sbi;
2869 elr->lr_next_group = start;
2870
2871 /*
2872 * Randomize first schedule time of the request to
2873 * spread the inode table initialization requests
2874 * better.
2875 */
dd1f723b
TT		 2876 elr->lr_next_sched = jiffies + (prandom_u32() %
2877 (EXT4_DEF_LI_MAX_START_DELAY * HZ));
bfff6873
LC		 2878 return elr;
2879}
2880
7f511862
TT		 2881int ext4_register_li_request(struct super_block *sb,
2882 ext4_group_t first_not_zeroed)
bfff6873
LC		 2883{
2884 struct ext4_sb_info *sbi = EXT4_SB(sb);
7f511862 2885 struct ext4_li_request *elr = NULL;
bfff6873 2886 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
6c5a6cb9 2887 int ret = 0;
bfff6873 2888
7f511862 2889 mutex_lock(&ext4_li_mtx);
51ce6511
LC		 2890 if (sbi->s_li_request != NULL) {
2891 /*
2892 * Reset timeout so it can be computed again, because
2893 * s_li_wait_mult might have changed.
2894 */
2895 sbi->s_li_request->lr_timeout = 0;
7f511862 2896 goto out;
51ce6511 2897 }
bfff6873
LC		 2898
2899 if (first_not_zeroed == ngroups ||
2900 (sb->s_flags & MS_RDONLY) ||
55ff3840 2901 !test_opt(sb, INIT_INODE_TABLE))
7f511862 2902 goto out;
bfff6873
LC		 2903
2904 elr = ext4_li_request_new(sb, first_not_zeroed);
7f511862
TT		 2905 if (!elr) {
2906 ret = -ENOMEM;
2907 goto out;
2908 }
bfff6873
LC		 2909
2910 if (NULL == ext4_li_info) {
2911 ret = ext4_li_info_new();
2912 if (ret)
2913 goto out;
2914 }
2915
2916 mutex_lock(&ext4_li_info->li_list_mtx);
2917 list_add(&elr->lr_request, &ext4_li_info->li_request_list);
2918 mutex_unlock(&ext4_li_info->li_list_mtx);
2919
2920 sbi->s_li_request = elr;
46e4690b
TM		 2921 /*
2922 * set elr to NULL here since it has been inserted to
2923 * the request_list and the removal and free of it is
2924 * handled by ext4_clear_request_list from now on.
2925 */
2926 elr = NULL;
bfff6873
LC		 2927
2928 if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) {
2929 ret = ext4_run_lazyinit_thread();
2930 if (ret)
2931 goto out;
2932 }
bfff6873 2933out:
beed5ecb
NK		 2934 mutex_unlock(&ext4_li_mtx);
2935 if (ret)
bfff6873 2936 kfree(elr);
bfff6873
LC		 2937 return ret;
2938}
2939
2940/*
2941 * We do not need to lock anything since this is called on
2942 * module unload.
2943 */
2944static void ext4_destroy_lazyinit_thread(void)
2945{
2946 /*
2947 * If thread exited earlier
2948 * there's nothing to be done.
2949 */
8f1f7453 2950 if (!ext4_li_info || !ext4_lazyinit_task)
bfff6873
LC		 2951 return;
2952
8f1f7453 2953 kthread_stop(ext4_lazyinit_task);
bfff6873
LC		 2954}
2955
25ed6e8a
DW		 2956static int set_journal_csum_feature_set(struct super_block *sb)
2957{
2958 int ret = 1;
2959 int compat, incompat;
2960 struct ext4_sb_info *sbi = EXT4_SB(sb);
2961
9aa5d32b 2962 if (ext4_has_metadata_csum(sb)) {
db9ee220 2963 /* journal checksum v3 */
25ed6e8a 2964 compat = 0;
db9ee220 2965 incompat = JBD2_FEATURE_INCOMPAT_CSUM_V3;
25ed6e8a
DW		 2966 } else {
2967 /* journal checksum v1 */
2968 compat = JBD2_FEATURE_COMPAT_CHECKSUM;
2969 incompat = 0;
2970 }
2971
feb8c6d3
DW		 2972 jbd2_journal_clear_features(sbi->s_journal,
2973 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
2974 JBD2_FEATURE_INCOMPAT_CSUM_V3 |
2975 JBD2_FEATURE_INCOMPAT_CSUM_V2);
25ed6e8a
DW		 2976 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
2977 ret = jbd2_journal_set_features(sbi->s_journal,
2978 compat, 0,
2979 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT |
2980 incompat);
2981 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
2982 ret = jbd2_journal_set_features(sbi->s_journal,
2983 compat, 0,
2984 incompat);
2985 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
2986 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2987 } else {
feb8c6d3
DW		 2988 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
2989 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
25ed6e8a
DW		 2990 }
2991
2992 return ret;
2993}
2994
952fc18e
TT		 2995/*
2996 * Note: calculating the overhead so we can be compatible with
2997 * historical BSD practice is quite difficult in the face of
2998 * clusters/bigalloc. This is because multiple metadata blocks from
2999 * different block group can end up in the same allocation cluster.
3000 * Calculating the exact overhead in the face of clustered allocation
3001 * requires either O(all block bitmaps) in memory or O(number of block
3002 * groups**2) in time. We will still calculate the superblock for
3003 * older file systems --- and if we come across with a bigalloc file
3004 * system with zero in s_overhead_clusters the estimate will be close to
3005 * correct especially for very large cluster sizes --- but for newer
3006 * file systems, it's better to calculate this figure once at mkfs
3007 * time, and store it in the superblock. If the superblock value is
3008 * present (even for non-bigalloc file systems), we will use it.
3009 */
3010static int count_overhead(struct super_block *sb, ext4_group_t grp,
3011 char *buf)
3012{
3013 struct ext4_sb_info *sbi = EXT4_SB(sb);
3014 struct ext4_group_desc *gdp;
3015 ext4_fsblk_t first_block, last_block, b;
3016 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3017 int s, j, count = 0;
3018
e2b911c5 3019 if (!ext4_has_feature_bigalloc(sb))
0548bbb8
TT		 3020 return (ext4_bg_has_super(sb, grp) + ext4_bg_num_gdb(sb, grp) +
3021 sbi->s_itb_per_group + 2);
3022
952fc18e
TT		 3023 first_block = le32_to_cpu(sbi->s_es->s_first_data_block) +
3024 (grp * EXT4_BLOCKS_PER_GROUP(sb));
3025 last_block = first_block + EXT4_BLOCKS_PER_GROUP(sb) - 1;
3026 for (i = 0; i < ngroups; i++) {
3027 gdp = ext4_get_group_desc(sb, i, NULL);
3028 b = ext4_block_bitmap(sb, gdp);
3029 if (b >= first_block && b <= last_block) {
3030 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3031 count++;
3032 }
3033 b = ext4_inode_bitmap(sb, gdp);
3034 if (b >= first_block && b <= last_block) {
3035 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3036 count++;
3037 }
3038 b = ext4_inode_table(sb, gdp);
3039 if (b >= first_block && b + sbi->s_itb_per_group <= last_block)
3040 for (j = 0; j < sbi->s_itb_per_group; j++, b++) {
3041 int c = EXT4_B2C(sbi, b - first_block);
3042 ext4_set_bit(c, buf);
3043 count++;
3044 }
3045 if (i != grp)
3046 continue;
3047 s = 0;
3048 if (ext4_bg_has_super(sb, grp)) {
3049 ext4_set_bit(s++, buf);
3050 count++;
3051 }
3052 for (j = ext4_bg_num_gdb(sb, grp); j > 0; j--) {
3053 ext4_set_bit(EXT4_B2C(sbi, s++), buf);
3054 count++;
3055 }
3056 }
3057 if (!count)
3058 return 0;
3059 return EXT4_CLUSTERS_PER_GROUP(sb) -
3060 ext4_count_free(buf, EXT4_CLUSTERS_PER_GROUP(sb) / 8);
3061}
3062
3063/*
3064 * Compute the overhead and stash it in sbi->s_overhead
3065 */
3066int ext4_calculate_overhead(struct super_block *sb)
3067{
3068 struct ext4_sb_info *sbi = EXT4_SB(sb);
3069 struct ext4_super_block *es = sbi->s_es;
3070 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3071 ext4_fsblk_t overhead = 0;
4fdb5543 3072 char *buf = (char *) get_zeroed_page(GFP_NOFS);
952fc18e 3073
952fc18e
TT		 3074 if (!buf)
3075 return -ENOMEM;
3076
3077 /*
3078 * Compute the overhead (FS structures). This is constant
3079 * for a given filesystem unless the number of block groups
3080 * changes so we cache the previous value until it does.
3081 */
3082
3083 /*
3084 * All of the blocks before first_data_block are overhead
3085 */
3086 overhead = EXT4_B2C(sbi, le32_to_cpu(es->s_first_data_block));
3087
3088 /*
3089 * Add the overhead found in each block group
3090 */
3091 for (i = 0; i < ngroups; i++) {
3092 int blks;
3093
3094 blks = count_overhead(sb, i, buf);
3095 overhead += blks;
3096 if (blks)
3097 memset(buf, 0, PAGE_SIZE);
3098 cond_resched();
3099 }
b003b524
ES		 3100 /* Add the internal journal blocks as well */
3101 if (sbi->s_journal && !sbi->journal_bdev)
810da240 3102 overhead += EXT4_NUM_B2C(sbi, sbi->s_journal->j_maxlen);
0875a2b4 3103
952fc18e
TT		 3104 sbi->s_overhead = overhead;
3105 smp_wmb();
3106 free_page((unsigned long) buf);
3107 return 0;
3108}
3109
b5799018 3110static void ext4_set_resv_clusters(struct super_block *sb)
27dd4385
LC		 3111{
3112 ext4_fsblk_t resv_clusters;
b5799018 3113 struct ext4_sb_info *sbi = EXT4_SB(sb);
27dd4385 3114
30fac0f7
JK		 3115 /*
3116 * There's no need to reserve anything when we aren't using extents.
3117 * The space estimates are exact, there are no unwritten extents,
3118 * hole punching doesn't need new metadata... This is needed especially
3119 * to keep ext2/3 backward compatibility.
3120 */
e2b911c5 3121 if (!ext4_has_feature_extents(sb))
b5799018 3122 return;
27dd4385
LC		 3123 /*
3124 * By default we reserve 2% or 4096 clusters, whichever is smaller.
3125 * This should cover the situations where we can not afford to run
3126 * out of space like for example punch hole, or converting
556615dc 3127 * unwritten extents in delalloc path. In most cases such
27dd4385
LC		 3128 * allocation would require 1, or 2 blocks, higher numbers are
3129 * very rare.
3130 */
b5799018
TT		 3131 resv_clusters = (ext4_blocks_count(sbi->s_es) >>
3132 sbi->s_cluster_bits);
27dd4385
LC		 3133
3134 do_div(resv_clusters, 50);
3135 resv_clusters = min_t(ext4_fsblk_t, resv_clusters, 4096);
3136
b5799018 3137 atomic64_set(&sbi->s_resv_clusters, resv_clusters);
27dd4385
LC		 3138}
3139
2b2d6d01 3140static int ext4_fill_super(struct super_block *sb, void *data, int silent)
ac27a0ec 3141{
d4c402d9 3142 char *orig_data = kstrdup(data, GFP_KERNEL);
2b2d6d01 3143 struct buffer_head *bh;
617ba13b
MC		 3144 struct ext4_super_block *es = NULL;
3145 struct ext4_sb_info *sbi;
3146 ext4_fsblk_t block;
3147 ext4_fsblk_t sb_block = get_sb_block(&data);
70bbb3e0 3148 ext4_fsblk_t logical_sb_block;
ac27a0ec 3149 unsigned long offset = 0;
ac27a0ec
DK		 3150 unsigned long journal_devnum = 0;
3151 unsigned long def_mount_opts;
3152 struct inode *root;
0390131b 3153 const char *descr;
dcc7dae3 3154 int ret = -ENOMEM;
281b5995 3155 int blocksize, clustersize;
4ec11028
TT		 3156 unsigned int db_count;
3157 unsigned int i;
281b5995 3158 int needs_recovery, has_huge_files, has_bigalloc;
bd81d8ee 3159 __u64 blocks_count;
07aa2ea1 3160 int err = 0;
b3881f74 3161 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
bfff6873 3162 ext4_group_t first_not_zeroed;
ac27a0ec
DK		 3163
3164 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
3165 if (!sbi)
dcc7dae3 3166 goto out_free_orig;
705895b6
PE		 3167
3168 sbi->s_blockgroup_lock =
3169 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
3170 if (!sbi->s_blockgroup_lock) {
3171 kfree(sbi);
dcc7dae3 3172 goto out_free_orig;
705895b6 3173 }
ac27a0ec 3174 sb->s_fs_info = sbi;
2c0544b2 3175 sbi->s_sb = sb;
240799cd 3176 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
d9c9bef1 3177 sbi->s_sb_block = sb_block;
f613dfcb
TT		 3178 if (sb->s_bdev->bd_part)
3179 sbi->s_sectors_written_start =
3180 part_stat_read(sb->s_bdev->bd_part, sectors[1]);
ac27a0ec 3181
9f6200bb 3182 /* Cleanup superblock name */
ec3904dc 3183 strreplace(sb->s_id, '/', '!');
9f6200bb 3184
07aa2ea1 3185 /* -EINVAL is default */
dcc7dae3 3186 ret = -EINVAL;
617ba13b 3187 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
ac27a0ec 3188 if (!blocksize) {
b31e1552 3189 ext4_msg(sb, KERN_ERR, "unable to set blocksize");
ac27a0ec
DK		 3190 goto out_fail;
3191 }
3192
3193 /*
617ba13b 3194 * The ext4 superblock will not be buffer aligned for other than 1kB
ac27a0ec
DK		 3195 * block sizes. We need to calculate the offset from buffer start.
3196 */
617ba13b 3197 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
70bbb3e0
AM		 3198 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3199 offset = do_div(logical_sb_block, blocksize);
ac27a0ec 3200 } else {
70bbb3e0 3201 logical_sb_block = sb_block;
ac27a0ec
DK		 3202 }
3203
a8ac900b 3204 if (!(bh = sb_bread_unmovable(sb, logical_sb_block))) {
b31e1552 3205 ext4_msg(sb, KERN_ERR, "unable to read superblock");
ac27a0ec
DK		 3206 goto out_fail;
3207 }
3208 /*
3209 * Note: s_es must be initialized as soon as possible because
617ba13b 3210 * some ext4 macro-instructions depend on its value
ac27a0ec 3211 */
2716b802 3212 es = (struct ext4_super_block *) (bh->b_data + offset);
ac27a0ec
DK		 3213 sbi->s_es = es;
3214 sb->s_magic = le16_to_cpu(es->s_magic);
617ba13b
MC		 3215 if (sb->s_magic != EXT4_SUPER_MAGIC)
3216 goto cantfind_ext4;
afc32f7e 3217 sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
ac27a0ec 3218
feb0ab32 3219 /* Warn if metadata_csum and gdt_csum are both set. */
e2b911c5
DW		 3220 if (ext4_has_feature_metadata_csum(sb) &&
3221 ext4_has_feature_gdt_csum(sb))
363307e6 3222 ext4_warning(sb, "metadata_csum and uninit_bg are "
feb0ab32
DW		 3223 "redundant flags; please run fsck.");
3224
d25425f8
DW		 3225 /* Check for a known checksum algorithm */
3226 if (!ext4_verify_csum_type(sb, es)) {
3227 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3228 "unknown checksum algorithm.");
3229 silent = 1;
3230 goto cantfind_ext4;
3231 }
3232
0441984a 3233 /* Load the checksum driver */
e2b911c5 3234 if (ext4_has_feature_metadata_csum(sb)) {
0441984a
DW		 3235 sbi->s_chksum_driver = crypto_alloc_shash("crc32c", 0, 0);
3236 if (IS_ERR(sbi->s_chksum_driver)) {
3237 ext4_msg(sb, KERN_ERR, "Cannot load crc32c driver.");
3238 ret = PTR_ERR(sbi->s_chksum_driver);
3239 sbi->s_chksum_driver = NULL;
3240 goto failed_mount;
3241 }
3242 }
3243
a9c47317
DW		 3244 /* Check superblock checksum */
3245 if (!ext4_superblock_csum_verify(sb, es)) {
3246 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3247 "invalid superblock checksum. Run e2fsck?");
3248 silent = 1;
6a797d27 3249 ret = -EFSBADCRC;
a9c47317
DW		 3250 goto cantfind_ext4;
3251 }
3252
3253 /* Precompute checksum seed for all metadata */
e2b911c5 3254 if (ext4_has_feature_csum_seed(sb))
8c81bd8f
DW		 3255 sbi->s_csum_seed = le32_to_cpu(es->s_checksum_seed);
3256 else if (ext4_has_metadata_csum(sb))
a9c47317
DW		 3257 sbi->s_csum_seed = ext4_chksum(sbi, ~0, es->s_uuid,
3258 sizeof(es->s_uuid));
3259
ac27a0ec
DK		 3260 /* Set defaults before we parse the mount options */
3261 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
fd8c37ec 3262 set_opt(sb, INIT_INODE_TABLE);
617ba13b 3263 if (def_mount_opts & EXT4_DEFM_DEBUG)
fd8c37ec 3264 set_opt(sb, DEBUG);
87f26807 3265 if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
fd8c37ec 3266 set_opt(sb, GRPID);
617ba13b 3267 if (def_mount_opts & EXT4_DEFM_UID16)
fd8c37ec 3268 set_opt(sb, NO_UID32);
ea663336 3269 /* xattr user namespace & acls are now defaulted on */
ea663336 3270 set_opt(sb, XATTR_USER);
03010a33 3271#ifdef CONFIG_EXT4_FS_POSIX_ACL
ea663336 3272 set_opt(sb, POSIX_ACL);
2e7842b8 3273#endif
98c1a759
DW		 3274 /* don't forget to enable journal_csum when metadata_csum is enabled. */
3275 if (ext4_has_metadata_csum(sb))
3276 set_opt(sb, JOURNAL_CHECKSUM);
3277
617ba13b 3278 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
fd8c37ec 3279 set_opt(sb, JOURNAL_DATA);
617ba13b 3280 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
fd8c37ec 3281 set_opt(sb, ORDERED_DATA);
617ba13b 3282 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
fd8c37ec 3283 set_opt(sb, WRITEBACK_DATA);
617ba13b
MC		 3284
3285 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
fd8c37ec 3286 set_opt(sb, ERRORS_PANIC);
bb4f397a 3287 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
fd8c37ec 3288 set_opt(sb, ERRORS_CONT);
bb4f397a 3289 else
fd8c37ec 3290 set_opt(sb, ERRORS_RO);
45f1a9c3
DW		 3291 /* block_validity enabled by default; disable with noblock_validity */
3292 set_opt(sb, BLOCK_VALIDITY);
8b67f04a 3293 if (def_mount_opts & EXT4_DEFM_DISCARD)
fd8c37ec 3294 set_opt(sb, DISCARD);
ac27a0ec 3295
08cefc7a
EB		 3296 sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));
3297 sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid));
30773840
TT		 3298 sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
3299 sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
3300 sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
ac27a0ec 3301
8b67f04a 3302 if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0)
fd8c37ec 3303 set_opt(sb, BARRIER);
ac27a0ec 3304
dd919b98
AK		 3305 /*
3306 * enable delayed allocation by default
3307 * Use -o nodelalloc to turn it off
3308 */
bc0b75f7 3309 if (!IS_EXT3_SB(sb) && !IS_EXT2_SB(sb) &&
8b67f04a 3310 ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0))
fd8c37ec 3311 set_opt(sb, DELALLOC);
dd919b98 3312
51ce6511
LC		 3313 /*
3314 * set default s_li_wait_mult for lazyinit, for the case there is
3315 * no mount option specified.
3316 */
3317 sbi->s_li_wait_mult = EXT4_DEF_LI_WAIT_MULT;
3318
8b67f04a 3319 if (!parse_options((char *) sbi->s_es->s_mount_opts, sb,
661aa520 3320 &journal_devnum, &journal_ioprio, 0)) {
8b67f04a
TT		 3321 ext4_msg(sb, KERN_WARNING,
3322 "failed to parse options in superblock: %s",
3323 sbi->s_es->s_mount_opts);
3324 }
5a916be1 3325 sbi->s_def_mount_opt = sbi->s_mount_opt;
b3881f74 3326 if (!parse_options((char *) data, sb, &journal_devnum,
661aa520 3327 &journal_ioprio, 0))
ac27a0ec
DK		 3328 goto failed_mount;
3329
56889787
TT		 3330 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
3331 printk_once(KERN_WARNING "EXT4-fs: Warning: mounting "
3332 "with data=journal disables delayed "
3333 "allocation and O_DIRECT support!\n");
3334 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
3335 ext4_msg(sb, KERN_ERR, "can't mount with "
3336 "both data=journal and delalloc");
3337 goto failed_mount;
3338 }
3339 if (test_opt(sb, DIOREAD_NOLOCK)) {
3340 ext4_msg(sb, KERN_ERR, "can't mount with "
6ae6514b 3341 "both data=journal and dioread_nolock");
56889787
TT		 3342 goto failed_mount;
3343 }
923ae0ff
RZ		 3344 if (test_opt(sb, DAX)) {
3345 ext4_msg(sb, KERN_ERR, "can't mount with "
3346 "both data=journal and dax");
3347 goto failed_mount;
3348 }
56889787
TT		 3349 if (test_opt(sb, DELALLOC))
3350 clear_opt(sb, DELALLOC);
001e4a87
TH		 3351 } else {
3352 sb->s_iflags |= SB_I_CGROUPWB;
56889787
TT		 3353 }
3354
ac27a0ec 3355 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
482a7425 3356 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec 3357
617ba13b 3358 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
e2b911c5
DW		 3359 (ext4_has_compat_features(sb) ||
3360 ext4_has_ro_compat_features(sb) ||
3361 ext4_has_incompat_features(sb)))
b31e1552
ES		 3362 ext4_msg(sb, KERN_WARNING,
3363 "feature flags set on rev 0 fs, "
3364 "running e2fsck is recommended");
469108ff 3365
ed3654eb
TT		 3366 if (es->s_creator_os == cpu_to_le32(EXT4_OS_HURD)) {
3367 set_opt2(sb, HURD_COMPAT);
e2b911c5 3368 if (ext4_has_feature_64bit(sb)) {
ed3654eb
TT		 3369 ext4_msg(sb, KERN_ERR,
3370 "The Hurd can't support 64-bit file systems");
3371 goto failed_mount;
3372 }
3373 }
3374
2035e776
TT		 3375 if (IS_EXT2_SB(sb)) {
3376 if (ext2_feature_set_ok(sb))
3377 ext4_msg(sb, KERN_INFO, "mounting ext2 file system "
3378 "using the ext4 subsystem");
3379 else {
3380 ext4_msg(sb, KERN_ERR, "couldn't mount as ext2 due "
3381 "to feature incompatibilities");
3382 goto failed_mount;
3383 }
3384 }
3385
3386 if (IS_EXT3_SB(sb)) {
3387 if (ext3_feature_set_ok(sb))
3388 ext4_msg(sb, KERN_INFO, "mounting ext3 file system "
3389 "using the ext4 subsystem");
3390 else {
3391 ext4_msg(sb, KERN_ERR, "couldn't mount as ext3 due "
3392 "to feature incompatibilities");
3393 goto failed_mount;
3394 }
3395 }
3396
ac27a0ec
DK		 3397 /*
3398 * Check feature flags regardless of the revision level, since we
3399 * previously didn't change the revision level when setting the flags,
3400 * so there is a chance incompat flags are set on a rev 0 filesystem.
3401 */
a13fb1a4 3402 if (!ext4_feature_set_ok(sb, (sb->s_flags & MS_RDONLY)))
ac27a0ec 3403 goto failed_mount;
a13fb1a4 3404
261cb20c 3405 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
617ba13b
MC		 3406 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
3407 blocksize > EXT4_MAX_BLOCK_SIZE) {
b31e1552
ES		 3408 ext4_msg(sb, KERN_ERR,
3409 "Unsupported filesystem blocksize %d", blocksize);
ac27a0ec
DK		 3410 goto failed_mount;
3411 }
3412
923ae0ff
RZ		 3413 if (sbi->s_mount_opt & EXT4_MOUNT_DAX) {
3414 if (blocksize != PAGE_SIZE) {
3415 ext4_msg(sb, KERN_ERR,
3416 "error: unsupported blocksize for dax");
3417 goto failed_mount;
3418 }
3419 if (!sb->s_bdev->bd_disk->fops->direct_access) {
3420 ext4_msg(sb, KERN_ERR,
3421 "error: device does not support dax");
3422 goto failed_mount;
3423 }
3424 }
3425
e2b911c5 3426 if (ext4_has_feature_encrypt(sb) && es->s_encryption_level) {
6ddb2447
TT		 3427 ext4_msg(sb, KERN_ERR, "Unsupported encryption level %d",
3428 es->s_encryption_level);
3429 goto failed_mount;
3430 }
3431
ac27a0ec 3432 if (sb->s_blocksize != blocksize) {
ce40733c
AK		 3433 /* Validate the filesystem blocksize */
3434 if (!sb_set_blocksize(sb, blocksize)) {
b31e1552 3435 ext4_msg(sb, KERN_ERR, "bad block size %d",
ce40733c 3436 blocksize);
ac27a0ec
DK		 3437 goto failed_mount;
3438 }
3439
2b2d6d01 3440 brelse(bh);
70bbb3e0
AM		 3441 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3442 offset = do_div(logical_sb_block, blocksize);
a8ac900b 3443 bh = sb_bread_unmovable(sb, logical_sb_block);
ac27a0ec 3444 if (!bh) {
b31e1552
ES		 3445 ext4_msg(sb, KERN_ERR,
3446 "Can't read superblock on 2nd try");
ac27a0ec
DK		 3447 goto failed_mount;
3448 }
2716b802 3449 es = (struct ext4_super_block *)(bh->b_data + offset);
ac27a0ec 3450 sbi->s_es = es;
617ba13b 3451 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
b31e1552
ES		 3452 ext4_msg(sb, KERN_ERR,
3453 "Magic mismatch, very weird!");
ac27a0ec
DK		 3454 goto failed_mount;
3455 }
3456 }
3457
e2b911c5 3458 has_huge_files = ext4_has_feature_huge_file(sb);
f287a1a5
TT		 3459 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
3460 has_huge_files);
3461 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
ac27a0ec 3462
617ba13b
MC		 3463 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
3464 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
3465 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
ac27a0ec
DK		 3466 } else {
3467 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
3468 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
617ba13b 3469 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
1330593e 3470 (!is_power_of_2(sbi->s_inode_size)) ||
ac27a0ec 3471 (sbi->s_inode_size > blocksize)) {
b31e1552
ES		 3472 ext4_msg(sb, KERN_ERR,
3473 "unsupported inode size: %d",
2b2d6d01 3474 sbi->s_inode_size);
ac27a0ec
DK		 3475 goto failed_mount;
3476 }
ef7f3835
KS		 3477 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
3478 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
ac27a0ec 3479 }
0b8e58a1 3480
0d1ee42f 3481 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
e2b911c5 3482 if (ext4_has_feature_64bit(sb)) {
8fadc143 3483 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
0d1ee42f 3484 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
d8ea6cf8 3485 !is_power_of_2(sbi->s_desc_size)) {
b31e1552
ES		 3486 ext4_msg(sb, KERN_ERR,
3487 "unsupported descriptor size %lu",
0d1ee42f
AR		 3488 sbi->s_desc_size);
3489 goto failed_mount;
3490 }
3491 } else
3492 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
0b8e58a1 3493
ac27a0ec 3494 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
ac27a0ec 3495 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
b47b6f38 3496 if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
617ba13b 3497 goto cantfind_ext4;
0b8e58a1 3498
617ba13b 3499 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
ac27a0ec 3500 if (sbi->s_inodes_per_block == 0)
617ba13b 3501 goto cantfind_ext4;
ac27a0ec
DK		 3502 sbi->s_itb_per_group = sbi->s_inodes_per_group /
3503 sbi->s_inodes_per_block;
0d1ee42f 3504 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
ac27a0ec
DK		 3505 sbi->s_sbh = bh;
3506 sbi->s_mount_state = le16_to_cpu(es->s_state);
e57aa839
FW		 3507 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
3508 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
0b8e58a1 3509
2b2d6d01 3510 for (i = 0; i < 4; i++)
ac27a0ec
DK		 3511 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
3512 sbi->s_def_hash_version = es->s_def_hash_version;
e2b911c5 3513 if (ext4_has_feature_dir_index(sb)) {
23301410
TT		 3514 i = le32_to_cpu(es->s_flags);
3515 if (i & EXT2_FLAGS_UNSIGNED_HASH)
3516 sbi->s_hash_unsigned = 3;
3517 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
f99b2589 3518#ifdef __CHAR_UNSIGNED__
23301410
TT		 3519 if (!(sb->s_flags & MS_RDONLY))
3520 es->s_flags |=
3521 cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
3522 sbi->s_hash_unsigned = 3;
f99b2589 3523#else
23301410
TT		 3524 if (!(sb->s_flags & MS_RDONLY))
3525 es->s_flags |=
3526 cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
f99b2589 3527#endif
23301410 3528 }
f99b2589 3529 }
ac27a0ec 3530
281b5995
TT		 3531 /* Handle clustersize */
3532 clustersize = BLOCK_SIZE << le32_to_cpu(es->s_log_cluster_size);
e2b911c5 3533 has_bigalloc = ext4_has_feature_bigalloc(sb);
281b5995
TT		 3534 if (has_bigalloc) {
3535 if (clustersize < blocksize) {
3536 ext4_msg(sb, KERN_ERR,
3537 "cluster size (%d) smaller than "
3538 "block size (%d)", clustersize, blocksize);
3539 goto failed_mount;
3540 }
3541 sbi->s_cluster_bits = le32_to_cpu(es->s_log_cluster_size) -
3542 le32_to_cpu(es->s_log_block_size);
3543 sbi->s_clusters_per_group =
3544 le32_to_cpu(es->s_clusters_per_group);
3545 if (sbi->s_clusters_per_group > blocksize * 8) {
3546 ext4_msg(sb, KERN_ERR,
3547 "#clusters per group too big: %lu",
3548 sbi->s_clusters_per_group);
3549 goto failed_mount;
3550 }
3551 if (sbi->s_blocks_per_group !=
3552 (sbi->s_clusters_per_group * (clustersize / blocksize))) {
3553 ext4_msg(sb, KERN_ERR, "blocks per group (%lu) and "
3554 "clusters per group (%lu) inconsistent",
3555 sbi->s_blocks_per_group,
3556 sbi->s_clusters_per_group);
3557 goto failed_mount;
3558 }
3559 } else {
3560 if (clustersize != blocksize) {
3561 ext4_warning(sb, "fragment/cluster size (%d) != "
3562 "block size (%d)", clustersize,
3563 blocksize);
3564 clustersize = blocksize;
3565 }
3566 if (sbi->s_blocks_per_group > blocksize * 8) {
3567 ext4_msg(sb, KERN_ERR,
3568 "#blocks per group too big: %lu",
3569 sbi->s_blocks_per_group);
3570 goto failed_mount;
3571 }
3572 sbi->s_clusters_per_group = sbi->s_blocks_per_group;
3573 sbi->s_cluster_bits = 0;
ac27a0ec 3574 }
281b5995
TT		 3575 sbi->s_cluster_ratio = clustersize / blocksize;
3576
ac27a0ec 3577 if (sbi->s_inodes_per_group > blocksize * 8) {
b31e1552
ES		 3578 ext4_msg(sb, KERN_ERR,
3579 "#inodes per group too big: %lu",
2b2d6d01 3580 sbi->s_inodes_per_group);
ac27a0ec
DK		 3581 goto failed_mount;
3582 }
3583
960fd856
TT		 3584 /* Do we have standard group size of clustersize * 8 blocks ? */
3585 if (sbi->s_blocks_per_group == clustersize << 3)
3586 set_opt2(sb, STD_GROUP_SIZE);
3587
bf43d84b
ES		 3588 /*
3589 * Test whether we have more sectors than will fit in sector_t,
3590 * and whether the max offset is addressable by the page cache.
3591 */
5a9ae68a 3592 err = generic_check_addressable(sb->s_blocksize_bits,
30ca22c7 3593 ext4_blocks_count(es));
5a9ae68a 3594 if (err) {
b31e1552 3595 ext4_msg(sb, KERN_ERR, "filesystem"
bf43d84b 3596 " too large to mount safely on this system");
ac27a0ec 3597 if (sizeof(sector_t) < 8)
90c699a9 3598 ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled");
ac27a0ec
DK		 3599 goto failed_mount;
3600 }
3601
617ba13b
MC		 3602 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
3603 goto cantfind_ext4;
e7c95593 3604
0f2ddca6
FTN		 3605 /* check blocks count against device size */
3606 blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
3607 if (blocks_count && ext4_blocks_count(es) > blocks_count) {
b31e1552
ES		 3608 ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
3609 "exceeds size of device (%llu blocks)",
0f2ddca6
FTN		 3610 ext4_blocks_count(es), blocks_count);
3611 goto failed_mount;
3612 }
3613
0b8e58a1
AD		 3614 /*
3615 * It makes no sense for the first data block to be beyond the end
3616 * of the filesystem.
3617 */
3618 if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
5635a62b 3619 ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
b31e1552
ES		 3620 "block %u is beyond end of filesystem (%llu)",
3621 le32_to_cpu(es->s_first_data_block),
3622 ext4_blocks_count(es));
e7c95593
ES		 3623 goto failed_mount;
3624 }
bd81d8ee
LV		 3625 blocks_count = (ext4_blocks_count(es) -
3626 le32_to_cpu(es->s_first_data_block) +
3627 EXT4_BLOCKS_PER_GROUP(sb) - 1);
3628 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
4ec11028 3629 if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
b31e1552 3630 ext4_msg(sb, KERN_WARNING, "groups count too large: %u "
4ec11028 3631 "(block count %llu, first data block %u, "
b31e1552 3632 "blocks per group %lu)", sbi->s_groups_count,
4ec11028
TT		 3633 ext4_blocks_count(es),
3634 le32_to_cpu(es->s_first_data_block),
3635 EXT4_BLOCKS_PER_GROUP(sb));
3636 goto failed_mount;
3637 }
bd81d8ee 3638 sbi->s_groups_count = blocks_count;
fb0a387d
ES		 3639 sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
3640 (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
617ba13b
MC		 3641 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
3642 EXT4_DESC_PER_BLOCK(sb);
f18a5f21
TT		 3643 sbi->s_group_desc = ext4_kvmalloc(db_count *
3644 sizeof(struct buffer_head *),
3645 GFP_KERNEL);
ac27a0ec 3646 if (sbi->s_group_desc == NULL) {
b31e1552 3647 ext4_msg(sb, KERN_ERR, "not enough memory");
2cde417d 3648 ret = -ENOMEM;
ac27a0ec
DK		 3649 goto failed_mount;
3650 }
3651
705895b6 3652 bgl_lock_init(sbi->s_blockgroup_lock);
ac27a0ec
DK		 3653
3654 for (i = 0; i < db_count; i++) {
70bbb3e0 3655 block = descriptor_loc(sb, logical_sb_block, i);
a8ac900b 3656 sbi->s_group_desc[i] = sb_bread_unmovable(sb, block);
ac27a0ec 3657 if (!sbi->s_group_desc[i]) {
b31e1552
ES		 3658 ext4_msg(sb, KERN_ERR,
3659 "can't read group descriptor %d", i);
ac27a0ec
DK		 3660 db_count = i;
3661 goto failed_mount2;
3662 }
3663 }
bfff6873 3664 if (!ext4_check_descriptors(sb, &first_not_zeroed)) {
b31e1552 3665 ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
6a797d27 3666 ret = -EFSCORRUPTED;
f9ae9cf5 3667 goto failed_mount2;
ac27a0ec 3668 }
772cb7c8 3669
f9ae9cf5 3670 sbi->s_gdb_count = db_count;
ac27a0ec
DK		 3671 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
3672 spin_lock_init(&sbi->s_next_gen_lock);
3673
04ecddb7
JM		 3674 setup_timer(&sbi->s_err_report, print_daily_error_info,
3675 (unsigned long) sb);
04496411 3676
a75ae78f 3677 /* Register extent status tree shrinker */
eb68d0e2 3678 if (ext4_es_register_shrinker(sbi))
ce7e010a 3679 goto failed_mount3;
ce7e010a 3680
c9de560d 3681 sbi->s_stripe = ext4_get_stripe_size(sbi);
67a5da56 3682 sbi->s_extent_max_zeroout_kb = 32;
c9de560d 3683
f9ae9cf5
TT		 3684 /*
3685 * set up enough so that it can read an inode
3686 */
f6e63f90 3687 sb->s_op = &ext4_sops;
617ba13b
MC		 3688 sb->s_export_op = &ext4_export_ops;
3689 sb->s_xattr = ext4_xattr_handlers;
ac27a0ec 3690#ifdef CONFIG_QUOTA
617ba13b 3691 sb->dq_op = &ext4_quota_operations;
e2b911c5 3692 if (ext4_has_feature_quota(sb))
1fa5efe3 3693 sb->s_qcop = &dquot_quotactl_sysfile_ops;
262b4662
JK		 3694 else
3695 sb->s_qcop = &ext4_qctl_operations;
689c958c 3696 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP | QTYPE_MASK_PRJ;
ac27a0ec 3697#endif
f2fa2ffc
AK		 3698 memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
3699
ac27a0ec 3700 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
3b9d4ed2 3701 mutex_init(&sbi->s_orphan_lock);
ac27a0ec
DK		 3702
3703 sb->s_root = NULL;
3704
3705 needs_recovery = (es->s_last_orphan != 0 ||
e2b911c5 3706 ext4_has_feature_journal_needs_recovery(sb));
ac27a0ec 3707
e2b911c5 3708 if (ext4_has_feature_mmp(sb) && !(sb->s_flags & MS_RDONLY))
c5e06d10 3709 if (ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block)))
50460fe8 3710 goto failed_mount3a;
c5e06d10 3711
ac27a0ec
DK		 3712 /*
3713 * The first inode we look at is the journal inode. Don't try
3714 * root first: it may be modified in the journal!
3715 */
e2b911c5 3716 if (!test_opt(sb, NOLOAD) && ext4_has_feature_journal(sb)) {
617ba13b 3717 if (ext4_load_journal(sb, es, journal_devnum))
50460fe8 3718 goto failed_mount3a;
0390131b 3719 } else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) &&
e2b911c5 3720 ext4_has_feature_journal_needs_recovery(sb)) {
b31e1552
ES		 3721 ext4_msg(sb, KERN_ERR, "required journal recovery "
3722 "suppressed and not mounted read-only");
744692dc 3723 goto failed_mount_wq;
ac27a0ec 3724 } else {
1e381f60
DM		 3725 /* Nojournal mode, all journal mount options are illegal */
3726 if (test_opt2(sb, EXPLICIT_JOURNAL_CHECKSUM)) {
3727 ext4_msg(sb, KERN_ERR, "can't mount with "
3728 "journal_checksum, fs mounted w/o journal");
3729 goto failed_mount_wq;
3730 }
3731 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
3732 ext4_msg(sb, KERN_ERR, "can't mount with "
3733 "journal_async_commit, fs mounted w/o journal");
3734 goto failed_mount_wq;
3735 }
3736 if (sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) {
3737 ext4_msg(sb, KERN_ERR, "can't mount with "
3738 "commit=%lu, fs mounted w/o journal",
3739 sbi->s_commit_interval / HZ);
3740 goto failed_mount_wq;
3741 }
3742 if (EXT4_MOUNT_DATA_FLAGS &
3743 (sbi->s_mount_opt ^ sbi->s_def_mount_opt)) {
3744 ext4_msg(sb, KERN_ERR, "can't mount with "
3745 "data=, fs mounted w/o journal");
3746 goto failed_mount_wq;
3747 }
3748 sbi->s_def_mount_opt &= EXT4_MOUNT_JOURNAL_CHECKSUM;
3749 clear_opt(sb, JOURNAL_CHECKSUM);
fd8c37ec 3750 clear_opt(sb, DATA_FLAGS);
0390131b
FM		 3751 sbi->s_journal = NULL;
3752 needs_recovery = 0;
3753 goto no_journal;
ac27a0ec
DK		 3754 }
3755
e2b911c5 3756 if (ext4_has_feature_64bit(sb) &&
eb40a09c
JS		 3757 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
3758 JBD2_FEATURE_INCOMPAT_64BIT)) {
b31e1552 3759 ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
744692dc 3760 goto failed_mount_wq;
eb40a09c
JS		 3761 }
3762
25ed6e8a
DW		 3763 if (!set_journal_csum_feature_set(sb)) {
3764 ext4_msg(sb, KERN_ERR, "Failed to set journal checksum "
3765 "feature set");
3766 goto failed_mount_wq;
d4da6c9c 3767 }
818d276c 3768
ac27a0ec
DK		 3769 /* We have now updated the journal if required, so we can
3770 * validate the data journaling mode. */
3771 switch (test_opt(sb, DATA_FLAGS)) {
3772 case 0:
3773 /* No mode set, assume a default based on the journal
63f57933
AM		 3774 * capabilities: ORDERED_DATA if the journal can
3775 * cope, else JOURNAL_DATA
3776 */
dab291af
MC		 3777 if (jbd2_journal_check_available_features
3778 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
fd8c37ec 3779 set_opt(sb, ORDERED_DATA);
ac27a0ec 3780 else
fd8c37ec 3781 set_opt(sb, JOURNAL_DATA);
ac27a0ec
DK		 3782 break;
3783
617ba13b
MC		 3784 case EXT4_MOUNT_ORDERED_DATA:
3785 case EXT4_MOUNT_WRITEBACK_DATA:
dab291af
MC		 3786 if (!jbd2_journal_check_available_features
3787 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
b31e1552
ES		 3788 ext4_msg(sb, KERN_ERR, "Journal does not support "
3789 "requested data journaling mode");
744692dc 3790 goto failed_mount_wq;
ac27a0ec
DK		 3791 }
3792 default:
3793 break;
3794 }
b3881f74 3795 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
ac27a0ec 3796
18aadd47
BJ		 3797 sbi->s_journal->j_commit_callback = ext4_journal_commit_callback;
3798
ce7e010a 3799no_journal:
9c191f70
M		 3800 if (ext4_mballoc_ready) {
3801 sbi->s_mb_cache = ext4_xattr_create_cache(sb->s_id);
3802 if (!sbi->s_mb_cache) {
3803 ext4_msg(sb, KERN_ERR, "Failed to create an mb_cache");
3804 goto failed_mount_wq;
3805 }
3806 }
3807
e2b911c5 3808 if ((DUMMY_ENCRYPTION_ENABLED(sbi) || ext4_has_feature_encrypt(sb)) &&
1cb767cd
TT		 3809 (blocksize != PAGE_CACHE_SIZE)) {
3810 ext4_msg(sb, KERN_ERR,
3811 "Unsupported blocksize for fs encryption");
3812 goto failed_mount_wq;
3813 }
3814
e2b911c5
DW		 3815 if (DUMMY_ENCRYPTION_ENABLED(sbi) && !(sb->s_flags & MS_RDONLY) &&
3816 !ext4_has_feature_encrypt(sb)) {
3817 ext4_set_feature_encrypt(sb);
6ddb2447
TT		 3818 ext4_commit_super(sb, 1);
3819 }
3820
952fc18e
TT		 3821 /*
3822 * Get the # of file system overhead blocks from the
3823 * superblock if present.
3824 */
3825 if (es->s_overhead_clusters)
3826 sbi->s_overhead = le32_to_cpu(es->s_overhead_clusters);
3827 else {
07aa2ea1
LC		 3828 err = ext4_calculate_overhead(sb);
3829 if (err)
952fc18e
TT		 3830 goto failed_mount_wq;
3831 }
3832
fd89d5f2
TH		 3833 /*
3834 * The maximum number of concurrent works can be high and
3835 * concurrency isn't really necessary. Limit it to 1.
3836 */
2e8fa54e
JK		 3837 EXT4_SB(sb)->rsv_conversion_wq =
3838 alloc_workqueue("ext4-rsv-conversion", WQ_MEM_RECLAIM | WQ_UNBOUND, 1);
3839 if (!EXT4_SB(sb)->rsv_conversion_wq) {
3840 printk(KERN_ERR "EXT4-fs: failed to create workqueue\n");
07aa2ea1 3841 ret = -ENOMEM;
2e8fa54e
JK		 3842 goto failed_mount4;
3843 }
3844
ac27a0ec 3845 /*
dab291af 3846 * The jbd2_journal_load will have done any necessary log recovery,
ac27a0ec
DK		 3847 * so we can safely mount the rest of the filesystem now.
3848 */
3849
1d1fe1ee
DH		 3850 root = ext4_iget(sb, EXT4_ROOT_INO);
3851 if (IS_ERR(root)) {
b31e1552 3852 ext4_msg(sb, KERN_ERR, "get root inode failed");
1d1fe1ee 3853 ret = PTR_ERR(root);
32a9bb57 3854 root = NULL;
ac27a0ec
DK		 3855 goto failed_mount4;
3856 }
3857 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
b31e1552 3858 ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
94bf608a 3859 iput(root);
ac27a0ec
DK		 3860 goto failed_mount4;
3861 }
48fde701 3862 sb->s_root = d_make_root(root);
1d1fe1ee 3863 if (!sb->s_root) {
b31e1552 3864 ext4_msg(sb, KERN_ERR, "get root dentry failed");
1d1fe1ee
DH		 3865 ret = -ENOMEM;
3866 goto failed_mount4;
3867 }
ac27a0ec 3868
7e84b621
ES		 3869 if (ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY))
3870 sb->s_flags |= MS_RDONLY;
ef7f3835
KS		 3871
3872 /* determine the minimum size of new large inodes, if present */
3873 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
3874 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
3875 EXT4_GOOD_OLD_INODE_SIZE;
e2b911c5 3876 if (ext4_has_feature_extra_isize(sb)) {
ef7f3835
KS		 3877 if (sbi->s_want_extra_isize <
3878 le16_to_cpu(es->s_want_extra_isize))
3879 sbi->s_want_extra_isize =
3880 le16_to_cpu(es->s_want_extra_isize);
3881 if (sbi->s_want_extra_isize <
3882 le16_to_cpu(es->s_min_extra_isize))
3883 sbi->s_want_extra_isize =
3884 le16_to_cpu(es->s_min_extra_isize);
3885 }
3886 }
3887 /* Check if enough inode space is available */
3888 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
3889 sbi->s_inode_size) {
3890 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
3891 EXT4_GOOD_OLD_INODE_SIZE;
b31e1552
ES		 3892 ext4_msg(sb, KERN_INFO, "required extra inode space not"
3893 "available");
ef7f3835
KS		 3894 }
3895
b5799018 3896 ext4_set_resv_clusters(sb);
27dd4385 3897
6fd058f7
TT		 3898 err = ext4_setup_system_zone(sb);
3899 if (err) {
b31e1552 3900 ext4_msg(sb, KERN_ERR, "failed to initialize system "
fbe845dd 3901 "zone (%d)", err);
f9ae9cf5
TT		 3902 goto failed_mount4a;
3903 }
3904
3905 ext4_ext_init(sb);
3906 err = ext4_mb_init(sb);
3907 if (err) {
3908 ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)",
3909 err);
dcf2d804 3910 goto failed_mount5;
c2774d84
AK		 3911 }
3912
d5e03cbb
TT		 3913 block = ext4_count_free_clusters(sb);
3914 ext4_free_blocks_count_set(sbi->s_es,
3915 EXT4_C2B(sbi, block));
908c7f19
TH		 3916 err = percpu_counter_init(&sbi->s_freeclusters_counter, block,
3917 GFP_KERNEL);
d5e03cbb
TT		 3918 if (!err) {
3919 unsigned long freei = ext4_count_free_inodes(sb);
3920 sbi->s_es->s_free_inodes_count = cpu_to_le32(freei);
908c7f19
TH		 3921 err = percpu_counter_init(&sbi->s_freeinodes_counter, freei,
3922 GFP_KERNEL);
d5e03cbb
TT		 3923 }
3924 if (!err)
3925 err = percpu_counter_init(&sbi->s_dirs_counter,
908c7f19 3926 ext4_count_dirs(sb), GFP_KERNEL);
d5e03cbb 3927 if (!err)
908c7f19
TH		 3928 err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0,
3929 GFP_KERNEL);
d5e03cbb
TT		 3930 if (err) {
3931 ext4_msg(sb, KERN_ERR, "insufficient memory");
3932 goto failed_mount6;
3933 }
3934
e2b911c5 3935 if (ext4_has_feature_flex_bg(sb))
d5e03cbb
TT		 3936 if (!ext4_fill_flex_info(sb)) {
3937 ext4_msg(sb, KERN_ERR,
3938 "unable to initialize "
3939 "flex_bg meta info!");
3940 goto failed_mount6;
3941 }
3942
bfff6873
LC		 3943 err = ext4_register_li_request(sb, first_not_zeroed);
3944 if (err)
dcf2d804 3945 goto failed_mount6;
bfff6873 3946
b5799018 3947 err = ext4_register_sysfs(sb);
dcf2d804
TM		 3948 if (err)
3949 goto failed_mount7;
3197ebdb 3950
9b2ff357
JK		 3951#ifdef CONFIG_QUOTA
3952 /* Enable quota usage during mount. */
e2b911c5 3953 if (ext4_has_feature_quota(sb) && !(sb->s_flags & MS_RDONLY)) {
9b2ff357
JK		 3954 err = ext4_enable_quotas(sb);
3955 if (err)
3956 goto failed_mount8;
3957 }
3958#endif /* CONFIG_QUOTA */
3959
617ba13b
MC		 3960 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
3961 ext4_orphan_cleanup(sb, es);
3962 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
0390131b 3963 if (needs_recovery) {
b31e1552 3964 ext4_msg(sb, KERN_INFO, "recovery complete");
0390131b
FM		 3965 ext4_mark_recovery_complete(sb, es);
3966 }
3967 if (EXT4_SB(sb)->s_journal) {
3968 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
3969 descr = " journalled data mode";
3970 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
3971 descr = " ordered data mode";
3972 else
3973 descr = " writeback data mode";
3974 } else
3975 descr = "out journal";
3976
79add3a3
LC		 3977 if (test_opt(sb, DISCARD)) {
3978 struct request_queue *q = bdev_get_queue(sb->s_bdev);
3979 if (!blk_queue_discard(q))
3980 ext4_msg(sb, KERN_WARNING,
3981 "mounting with \"discard\" option, but "
3982 "the device does not support discard");
3983 }
3984
e294a537
TT		 3985 if (___ratelimit(&ext4_mount_msg_ratelimit, "EXT4-fs mount"))
3986 ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. "
3987 "Opts: %s%s%s", descr, sbi->s_es->s_mount_opts,
3988 *sbi->s_es->s_mount_opts ? "; " : "", orig_data);
ac27a0ec 3989
66e61a9e
TT		 3990 if (es->s_error_count)
3991 mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */
ac27a0ec 3992
efbed4dc
TT		 3993 /* Enable message ratelimiting. Default is 10 messages per 5 secs. */
3994 ratelimit_state_init(&sbi->s_err_ratelimit_state, 5 * HZ, 10);
3995 ratelimit_state_init(&sbi->s_warning_ratelimit_state, 5 * HZ, 10);
3996 ratelimit_state_init(&sbi->s_msg_ratelimit_state, 5 * HZ, 10);
3997
d4c402d9 3998 kfree(orig_data);
ac27a0ec
DK		 3999 return 0;
4000
617ba13b 4001cantfind_ext4:
ac27a0ec 4002 if (!silent)
b31e1552 4003 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
ac27a0ec
DK		 4004 goto failed_mount;
4005
72ba7450
TT		 4006#ifdef CONFIG_QUOTA
4007failed_mount8:
ebd173be 4008 ext4_unregister_sysfs(sb);
72ba7450 4009#endif
dcf2d804
TM		 4010failed_mount7:
4011 ext4_unregister_li_request(sb);
4012failed_mount6:
f9ae9cf5 4013 ext4_mb_release(sb);
d5e03cbb 4014 if (sbi->s_flex_groups)
b93b41d4 4015 kvfree(sbi->s_flex_groups);
d5e03cbb
TT		 4016 percpu_counter_destroy(&sbi->s_freeclusters_counter);
4017 percpu_counter_destroy(&sbi->s_freeinodes_counter);
4018 percpu_counter_destroy(&sbi->s_dirs_counter);
4019 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
00764937 4020failed_mount5:
f9ae9cf5
TT		 4021 ext4_ext_release(sb);
4022 ext4_release_system_zone(sb);
4023failed_mount4a:
94bf608a 4024 dput(sb->s_root);
32a9bb57 4025 sb->s_root = NULL;
94bf608a 4026failed_mount4:
b31e1552 4027 ext4_msg(sb, KERN_ERR, "mount failed");
2e8fa54e
JK		 4028 if (EXT4_SB(sb)->rsv_conversion_wq)
4029 destroy_workqueue(EXT4_SB(sb)->rsv_conversion_wq);
4c0425ff 4030failed_mount_wq:
0390131b
FM		 4031 if (sbi->s_journal) {
4032 jbd2_journal_destroy(sbi->s_journal);
4033 sbi->s_journal = NULL;
4034 }
50460fe8 4035failed_mount3a:
d3922a77 4036 ext4_es_unregister_shrinker(sbi);
eb68d0e2 4037failed_mount3:
9105bb14 4038 del_timer_sync(&sbi->s_err_report);
c5e06d10
JL		 4039 if (sbi->s_mmp_tsk)
4040 kthread_stop(sbi->s_mmp_tsk);
ac27a0ec
DK		 4041failed_mount2:
4042 for (i = 0; i < db_count; i++)
4043 brelse(sbi->s_group_desc[i]);
b93b41d4 4044 kvfree(sbi->s_group_desc);
ac27a0ec 4045failed_mount:
0441984a
DW		 4046 if (sbi->s_chksum_driver)
4047 crypto_free_shash(sbi->s_chksum_driver);
ac27a0ec 4048#ifdef CONFIG_QUOTA
a2d4a646 4049 for (i = 0; i < EXT4_MAXQUOTAS; i++)
ac27a0ec
DK		 4050 kfree(sbi->s_qf_names[i]);
4051#endif
617ba13b 4052 ext4_blkdev_remove(sbi);
ac27a0ec
DK		 4053 brelse(bh);
4054out_fail:
4055 sb->s_fs_info = NULL;
f6830165 4056 kfree(sbi->s_blockgroup_lock);
ac27a0ec 4057 kfree(sbi);
dcc7dae3 4058out_free_orig:
d4c402d9 4059 kfree(orig_data);
07aa2ea1 4060 return err ? err : ret;
ac27a0ec
DK		 4061}
4062
4063/*
4064 * Setup any per-fs journal parameters now. We'll do this both on
4065 * initial mount, once the journal has been initialised but before we've
4066 * done any recovery; and again on any subsequent remount.
4067 */
617ba13b 4068static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
ac27a0ec 4069{
617ba13b 4070 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4071
30773840
TT		 4072 journal->j_commit_interval = sbi->s_commit_interval;
4073 journal->j_min_batch_time = sbi->s_min_batch_time;
4074 journal->j_max_batch_time = sbi->s_max_batch_time;
ac27a0ec 4075
a931da6a 4076 write_lock(&journal->j_state_lock);
ac27a0ec 4077 if (test_opt(sb, BARRIER))
dab291af 4078 journal->j_flags |= JBD2_BARRIER;
ac27a0ec 4079 else
dab291af 4080 journal->j_flags &= ~JBD2_BARRIER;
5bf5683a
HK		 4081 if (test_opt(sb, DATA_ERR_ABORT))
4082 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
4083 else
4084 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
a931da6a 4085 write_unlock(&journal->j_state_lock);
ac27a0ec
DK		 4086}
4087
617ba13b 4088static journal_t *ext4_get_journal(struct super_block *sb,
ac27a0ec
DK		 4089 unsigned int journal_inum)
4090{
4091 struct inode *journal_inode;
4092 journal_t *journal;
4093
e2b911c5 4094 BUG_ON(!ext4_has_feature_journal(sb));
0390131b 4095
ac27a0ec
DK		 4096 /* First, test for the existence of a valid inode on disk. Bad
4097 * things happen if we iget() an unused inode, as the subsequent
4098 * iput() will try to delete it. */
4099
1d1fe1ee
DH		 4100 journal_inode = ext4_iget(sb, journal_inum);
4101 if (IS_ERR(journal_inode)) {
b31e1552 4102 ext4_msg(sb, KERN_ERR, "no journal found");
ac27a0ec
DK		 4103 return NULL;
4104 }
4105 if (!journal_inode->i_nlink) {
4106 make_bad_inode(journal_inode);
4107 iput(journal_inode);
b31e1552 4108 ext4_msg(sb, KERN_ERR, "journal inode is deleted");
ac27a0ec
DK		 4109 return NULL;
4110 }
4111
e5f8eab8 4112 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
ac27a0ec 4113 journal_inode, journal_inode->i_size);
1d1fe1ee 4114 if (!S_ISREG(journal_inode->i_mode)) {
b31e1552 4115 ext4_msg(sb, KERN_ERR, "invalid journal inode");
ac27a0ec
DK		 4116 iput(journal_inode);
4117 return NULL;
4118 }
4119
dab291af 4120 journal = jbd2_journal_init_inode(journal_inode);
ac27a0ec 4121 if (!journal) {
b31e1552 4122 ext4_msg(sb, KERN_ERR, "Could not load journal inode");
ac27a0ec
DK		 4123 iput(journal_inode);
4124 return NULL;
4125 }
4126 journal->j_private = sb;
617ba13b 4127 ext4_init_journal_params(sb, journal);
ac27a0ec
DK		 4128 return journal;
4129}
4130
617ba13b 4131static journal_t *ext4_get_dev_journal(struct super_block *sb,
ac27a0ec
DK		 4132 dev_t j_dev)
4133{
2b2d6d01 4134 struct buffer_head *bh;
ac27a0ec 4135 journal_t *journal;
617ba13b
MC		 4136 ext4_fsblk_t start;
4137 ext4_fsblk_t len;
ac27a0ec 4138 int hblock, blocksize;
617ba13b 4139 ext4_fsblk_t sb_block;
ac27a0ec 4140 unsigned long offset;
2b2d6d01 4141 struct ext4_super_block *es;
ac27a0ec
DK		 4142 struct block_device *bdev;
4143
e2b911c5 4144 BUG_ON(!ext4_has_feature_journal(sb));
0390131b 4145
b31e1552 4146 bdev = ext4_blkdev_get(j_dev, sb);
ac27a0ec
DK		 4147 if (bdev == NULL)
4148 return NULL;
4149
ac27a0ec 4150 blocksize = sb->s_blocksize;
e1defc4f 4151 hblock = bdev_logical_block_size(bdev);
ac27a0ec 4152 if (blocksize < hblock) {
b31e1552
ES		 4153 ext4_msg(sb, KERN_ERR,
4154 "blocksize too small for journal device");
ac27a0ec
DK		 4155 goto out_bdev;
4156 }
4157
617ba13b
MC		 4158 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
4159 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
ac27a0ec
DK		 4160 set_blocksize(bdev, blocksize);
4161 if (!(bh = __bread(bdev, sb_block, blocksize))) {
b31e1552
ES		 4162 ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
4163 "external journal");
ac27a0ec
DK		 4164 goto out_bdev;
4165 }
4166
2716b802 4167 es = (struct ext4_super_block *) (bh->b_data + offset);
617ba13b 4168 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
ac27a0ec 4169 !(le32_to_cpu(es->s_feature_incompat) &
617ba13b 4170 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
b31e1552
ES		 4171 ext4_msg(sb, KERN_ERR, "external journal has "
4172 "bad superblock");
ac27a0ec
DK		 4173 brelse(bh);
4174 goto out_bdev;
4175 }
4176
df4763be
DW		 4177 if ((le32_to_cpu(es->s_feature_ro_compat) &
4178 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) &&
4179 es->s_checksum != ext4_superblock_csum(sb, es)) {
4180 ext4_msg(sb, KERN_ERR, "external journal has "
4181 "corrupt superblock");
4182 brelse(bh);
4183 goto out_bdev;
4184 }
4185
617ba13b 4186 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
b31e1552 4187 ext4_msg(sb, KERN_ERR, "journal UUID does not match");
ac27a0ec
DK		 4188 brelse(bh);
4189 goto out_bdev;
4190 }
4191
bd81d8ee 4192 len = ext4_blocks_count(es);
ac27a0ec
DK		 4193 start = sb_block + 1;
4194 brelse(bh); /* we're done with the superblock */
4195
dab291af 4196 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
ac27a0ec
DK		 4197 start, len, blocksize);
4198 if (!journal) {
b31e1552 4199 ext4_msg(sb, KERN_ERR, "failed to create device journal");
ac27a0ec
DK		 4200 goto out_bdev;
4201 }
4202 journal->j_private = sb;
9f203507 4203 ll_rw_block(READ | REQ_META | REQ_PRIO, 1, &journal->j_sb_buffer);
ac27a0ec
DK		 4204 wait_on_buffer(journal->j_sb_buffer);
4205 if (!buffer_uptodate(journal->j_sb_buffer)) {
b31e1552 4206 ext4_msg(sb, KERN_ERR, "I/O error on journal device");
ac27a0ec
DK		 4207 goto out_journal;
4208 }
4209 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
b31e1552
ES		 4210 ext4_msg(sb, KERN_ERR, "External journal has more than one "
4211 "user (unsupported) - %d",
ac27a0ec
DK		 4212 be32_to_cpu(journal->j_superblock->s_nr_users));
4213 goto out_journal;
4214 }
617ba13b
MC		 4215 EXT4_SB(sb)->journal_bdev = bdev;
4216 ext4_init_journal_params(sb, journal);
ac27a0ec 4217 return journal;
0b8e58a1 4218
ac27a0ec 4219out_journal:
dab291af 4220 jbd2_journal_destroy(journal);
ac27a0ec 4221out_bdev:
617ba13b 4222 ext4_blkdev_put(bdev);
ac27a0ec
DK		 4223 return NULL;
4224}
4225
617ba13b
MC		 4226static int ext4_load_journal(struct super_block *sb,
4227 struct ext4_super_block *es,
ac27a0ec
DK		 4228 unsigned long journal_devnum)
4229{
4230 journal_t *journal;
4231 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
4232 dev_t journal_dev;
4233 int err = 0;
4234 int really_read_only;
4235
e2b911c5 4236 BUG_ON(!ext4_has_feature_journal(sb));
0390131b 4237
ac27a0ec
DK		 4238 if (journal_devnum &&
4239 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
b31e1552
ES		 4240 ext4_msg(sb, KERN_INFO, "external journal device major/minor "
4241 "numbers have changed");
ac27a0ec
DK		 4242 journal_dev = new_decode_dev(journal_devnum);
4243 } else
4244 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
4245
4246 really_read_only = bdev_read_only(sb->s_bdev);
4247
4248 /*
4249 * Are we loading a blank journal or performing recovery after a
4250 * crash? For recovery, we need to check in advance whether we
4251 * can get read-write access to the device.
4252 */
e2b911c5 4253 if (ext4_has_feature_journal_needs_recovery(sb)) {
ac27a0ec 4254 if (sb->s_flags & MS_RDONLY) {
b31e1552
ES		 4255 ext4_msg(sb, KERN_INFO, "INFO: recovery "
4256 "required on readonly filesystem");
ac27a0ec 4257 if (really_read_only) {
b31e1552
ES		 4258 ext4_msg(sb, KERN_ERR, "write access "
4259 "unavailable, cannot proceed");
ac27a0ec
DK		 4260 return -EROFS;
4261 }
b31e1552
ES		 4262 ext4_msg(sb, KERN_INFO, "write access will "
4263 "be enabled during recovery");
ac27a0ec
DK		 4264 }
4265 }
4266
4267 if (journal_inum && journal_dev) {
b31e1552
ES		 4268 ext4_msg(sb, KERN_ERR, "filesystem has both journal "
4269 "and inode journals!");
ac27a0ec
DK		 4270 return -EINVAL;
4271 }
4272
4273 if (journal_inum) {
617ba13b 4274 if (!(journal = ext4_get_journal(sb, journal_inum)))
ac27a0ec
DK		 4275 return -EINVAL;
4276 } else {
617ba13b 4277 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
ac27a0ec
DK		 4278 return -EINVAL;
4279 }
4280
90576c0b 4281 if (!(journal->j_flags & JBD2_BARRIER))
b31e1552 4282 ext4_msg(sb, KERN_INFO, "barriers disabled");
4776004f 4283
e2b911c5 4284 if (!ext4_has_feature_journal_needs_recovery(sb))
dab291af 4285 err = jbd2_journal_wipe(journal, !really_read_only);
1c13d5c0
TT		 4286 if (!err) {
4287 char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL);
4288 if (save)
4289 memcpy(save, ((char *) es) +
4290 EXT4_S_ERR_START, EXT4_S_ERR_LEN);
dab291af 4291 err = jbd2_journal_load(journal);
1c13d5c0
TT		 4292 if (save)
4293 memcpy(((char *) es) + EXT4_S_ERR_START,
4294 save, EXT4_S_ERR_LEN);
4295 kfree(save);
4296 }
ac27a0ec
DK		 4297
4298 if (err) {
b31e1552 4299 ext4_msg(sb, KERN_ERR, "error loading journal");
dab291af 4300 jbd2_journal_destroy(journal);
ac27a0ec
DK		 4301 return err;
4302 }
4303
617ba13b
MC		 4304 EXT4_SB(sb)->s_journal = journal;
4305 ext4_clear_journal_err(sb, es);
ac27a0ec 4306
c41303ce 4307 if (!really_read_only && journal_devnum &&
ac27a0ec
DK		 4308 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
4309 es->s_journal_dev = cpu_to_le32(journal_devnum);
ac27a0ec
DK		 4310
4311 /* Make sure we flush the recovery flag to disk. */
e2d67052 4312 ext4_commit_super(sb, 1);
ac27a0ec
DK		 4313 }
4314
4315 return 0;
4316}
4317
e2d67052 4318static int ext4_commit_super(struct super_block *sb, int sync)
ac27a0ec 4319{
e2d67052 4320 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
617ba13b 4321 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
c4be0c1d 4322 int error = 0;
ac27a0ec 4323
bdfe0cbd 4324 if (!sbh || block_device_ejected(sb))
c4be0c1d 4325 return error;
914258bf
TT		 4326 if (buffer_write_io_error(sbh)) {
4327 /*
4328 * Oh, dear. A previous attempt to write the
4329 * superblock failed. This could happen because the
4330 * USB device was yanked out. Or it could happen to
4331 * be a transient write error and maybe the block will
4332 * be remapped. Nothing we can do but to retry the
4333 * write and hope for the best.
4334 */
b31e1552
ES		 4335 ext4_msg(sb, KERN_ERR, "previous I/O error to "
4336 "superblock detected");
914258bf
TT		 4337 clear_buffer_write_io_error(sbh);
4338 set_buffer_uptodate(sbh);
4339 }
71290b36
TT		 4340 /*
4341 * If the file system is mounted read-only, don't update the
4342 * superblock write time. This avoids updating the superblock
4343 * write time when we are mounting the root file system
4344 * read/only but we need to replay the journal; at that point,
4345 * for people who are east of GMT and who make their clock
4346 * tick in localtime for Windows bug-for-bug compatibility,
4347 * the clock is set in the future, and this will cause e2fsck
4348 * to complain and force a full file system check.
4349 */
4350 if (!(sb->s_flags & MS_RDONLY))
4351 es->s_wtime = cpu_to_le32(get_seconds());
f613dfcb
TT		 4352 if (sb->s_bdev->bd_part)
4353 es->s_kbytes_written =
4354 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written +
afc32f7e
TT		 4355 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
4356 EXT4_SB(sb)->s_sectors_written_start) >> 1));
f613dfcb
TT		 4357 else
4358 es->s_kbytes_written =
4359 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written);
d5e03cbb
TT		 4360 if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeclusters_counter))
4361 ext4_free_blocks_count_set(es,
57042651
TT		 4362 EXT4_C2B(EXT4_SB(sb), percpu_counter_sum_positive(
4363 &EXT4_SB(sb)->s_freeclusters_counter)));
d5e03cbb
TT		 4364 if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeinodes_counter))
4365 es->s_free_inodes_count =
4366 cpu_to_le32(percpu_counter_sum_positive(
ce7e010a 4367 &EXT4_SB(sb)->s_freeinodes_counter));
ac27a0ec 4368 BUFFER_TRACE(sbh, "marking dirty");
06db49e6 4369 ext4_superblock_csum_set(sb);
ac27a0ec 4370 mark_buffer_dirty(sbh);
914258bf 4371 if (sync) {
564bc402
DJ		 4372 error = __sync_dirty_buffer(sbh,
4373 test_opt(sb, BARRIER) ? WRITE_FUA : WRITE_SYNC);
c4be0c1d
TS		 4374 if (error)
4375 return error;
4376
4377 error = buffer_write_io_error(sbh);
4378 if (error) {
b31e1552
ES		 4379 ext4_msg(sb, KERN_ERR, "I/O error while writing "
4380 "superblock");
914258bf
TT		 4381 clear_buffer_write_io_error(sbh);
4382 set_buffer_uptodate(sbh);
4383 }
4384 }
c4be0c1d 4385 return error;
ac27a0ec
DK		 4386}
4387
ac27a0ec
DK		 4388/*
4389 * Have we just finished recovery? If so, and if we are mounting (or
4390 * remounting) the filesystem readonly, then we will end up with a
4391 * consistent fs on disk. Record that fact.
4392 */
2b2d6d01
TT		 4393static void ext4_mark_recovery_complete(struct super_block *sb,
4394 struct ext4_super_block *es)
ac27a0ec 4395{
617ba13b 4396 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 4397
e2b911c5 4398 if (!ext4_has_feature_journal(sb)) {
0390131b
FM		 4399 BUG_ON(journal != NULL);
4400 return;
4401 }
dab291af 4402 jbd2_journal_lock_updates(journal);
7ffe1ea8
HK		 4403 if (jbd2_journal_flush(journal) < 0)
4404 goto out;
4405
e2b911c5 4406 if (ext4_has_feature_journal_needs_recovery(sb) &&
ac27a0ec 4407 sb->s_flags & MS_RDONLY) {
e2b911c5 4408 ext4_clear_feature_journal_needs_recovery(sb);
e2d67052 4409 ext4_commit_super(sb, 1);
ac27a0ec 4410 }
7ffe1ea8
HK		 4411
4412out:
dab291af 4413 jbd2_journal_unlock_updates(journal);
ac27a0ec
DK		 4414}
4415
4416/*
4417 * If we are mounting (or read-write remounting) a filesystem whose journal
4418 * has recorded an error from a previous lifetime, move that error to the
4419 * main filesystem now.
4420 */
2b2d6d01
TT		 4421static void ext4_clear_journal_err(struct super_block *sb,
4422 struct ext4_super_block *es)
ac27a0ec
DK		 4423{
4424 journal_t *journal;
4425 int j_errno;
4426 const char *errstr;
4427
e2b911c5 4428 BUG_ON(!ext4_has_feature_journal(sb));
0390131b 4429
617ba13b 4430 journal = EXT4_SB(sb)->s_journal;
ac27a0ec
DK		 4431
4432 /*
4433 * Now check for any error status which may have been recorded in the
617ba13b 4434 * journal by a prior ext4_error() or ext4_abort()
ac27a0ec
DK		 4435 */
4436
dab291af 4437 j_errno = jbd2_journal_errno(journal);
ac27a0ec
DK		 4438 if (j_errno) {
4439 char nbuf[16];
4440
617ba13b 4441 errstr = ext4_decode_error(sb, j_errno, nbuf);
12062ddd 4442 ext4_warning(sb, "Filesystem error recorded "
ac27a0ec 4443 "from previous mount: %s", errstr);
12062ddd 4444 ext4_warning(sb, "Marking fs in need of filesystem check.");
ac27a0ec 4445
617ba13b
MC		 4446 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
4447 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
e2d67052 4448 ext4_commit_super(sb, 1);
ac27a0ec 4449
dab291af 4450 jbd2_journal_clear_err(journal);
d796c52e 4451 jbd2_journal_update_sb_errno(journal);
ac27a0ec
DK		 4452 }
4453}
4454
4455/*
4456 * Force the running and committing transactions to commit,
4457 * and wait on the commit.
4458 */
617ba13b 4459int ext4_force_commit(struct super_block *sb)
ac27a0ec
DK		 4460{
4461 journal_t *journal;
ac27a0ec
DK		 4462
4463 if (sb->s_flags & MS_RDONLY)
4464 return 0;
4465
617ba13b 4466 journal = EXT4_SB(sb)->s_journal;
b1deefc9 4467 return ext4_journal_force_commit(journal);
ac27a0ec
DK		 4468}
4469
617ba13b 4470static int ext4_sync_fs(struct super_block *sb, int wait)
ac27a0ec 4471{
14ce0cb4 4472 int ret = 0;
9eddacf9 4473 tid_t target;
06a407f1 4474 bool needs_barrier = false;
8d5d02e6 4475 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4476
9bffad1e 4477 trace_ext4_sync_fs(sb, wait);
2e8fa54e 4478 flush_workqueue(sbi->rsv_conversion_wq);
a1177825
JK		 4479 /*
4480 * Writeback quota in non-journalled quota case - journalled quota has
4481 * no dirty dquots
4482 */
4483 dquot_writeback_dquots(sb, -1);
06a407f1
DM		 4484 /*
4485 * Data writeback is possible w/o journal transaction, so barrier must
4486 * being sent at the end of the function. But we can skip it if
4487 * transaction_commit will do it for us.
4488 */
bda32530
TT		 4489 if (sbi->s_journal) {
4490 target = jbd2_get_latest_transaction(sbi->s_journal);
4491 if (wait && sbi->s_journal->j_flags & JBD2_BARRIER &&
4492 !jbd2_trans_will_send_data_barrier(sbi->s_journal, target))
4493 needs_barrier = true;
4494
4495 if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
4496 if (wait)
4497 ret = jbd2_log_wait_commit(sbi->s_journal,
4498 target);
4499 }
4500 } else if (wait && test_opt(sb, BARRIER))
06a407f1 4501 needs_barrier = true;
06a407f1
DM		 4502 if (needs_barrier) {
4503 int err;
4504 err = blkdev_issue_flush(sb->s_bdev, GFP_KERNEL, NULL);
4505 if (!ret)
4506 ret = err;
0390131b 4507 }
06a407f1
DM		 4508
4509 return ret;
4510}
4511
ac27a0ec
DK		 4512/*
4513 * LVM calls this function before a (read-only) snapshot is created. This
4514 * gives us a chance to flush the journal completely and mark the fs clean.
be4f27d3
YY		 4515 *
4516 * Note that only this function cannot bring a filesystem to be in a clean
8e8ad8a5
JK		 4517 * state independently. It relies on upper layer to stop all data & metadata
4518 * modifications.
ac27a0ec 4519 */
c4be0c1d 4520static int ext4_freeze(struct super_block *sb)
ac27a0ec 4521{
c4be0c1d
TS		 4522 int error = 0;
4523 journal_t *journal;
ac27a0ec 4524
9ca92389
TT		 4525 if (sb->s_flags & MS_RDONLY)
4526 return 0;
ac27a0ec 4527
9ca92389 4528 journal = EXT4_SB(sb)->s_journal;
7ffe1ea8 4529
bb044576
TT		 4530 if (journal) {
4531 /* Now we set up the journal barrier. */
4532 jbd2_journal_lock_updates(journal);
ac27a0ec 4533
bb044576
TT		 4534 /*
4535 * Don't clear the needs_recovery flag if we failed to
4536 * flush the journal.
4537 */
4538 error = jbd2_journal_flush(journal);
4539 if (error < 0)
4540 goto out;
c642dc9e
ES		 4541
4542 /* Journal blocked and flushed, clear needs_recovery flag. */
e2b911c5 4543 ext4_clear_feature_journal_needs_recovery(sb);
bb044576 4544 }
9ca92389 4545
9ca92389 4546 error = ext4_commit_super(sb, 1);
6b0310fb 4547out:
bb044576
TT		 4548 if (journal)
4549 /* we rely on upper layer to stop further updates */
4550 jbd2_journal_unlock_updates(journal);
6b0310fb 4551 return error;
ac27a0ec
DK		 4552}
4553
4554/*
4555 * Called by LVM after the snapshot is done. We need to reset the RECOVER
4556 * flag here, even though the filesystem is not technically dirty yet.
4557 */
c4be0c1d 4558static int ext4_unfreeze(struct super_block *sb)
ac27a0ec 4559{
9ca92389
TT		 4560 if (sb->s_flags & MS_RDONLY)
4561 return 0;
4562
c642dc9e
ES		 4563 if (EXT4_SB(sb)->s_journal) {
4564 /* Reset the needs_recovery flag before the fs is unlocked. */
e2b911c5 4565 ext4_set_feature_journal_needs_recovery(sb);
c642dc9e
ES		 4566 }
4567
9ca92389 4568 ext4_commit_super(sb, 1);
c4be0c1d 4569 return 0;
ac27a0ec
DK		 4570}
4571
673c6100
TT		 4572/*
4573 * Structure to save mount options for ext4_remount's benefit
4574 */
4575struct ext4_mount_options {
4576 unsigned long s_mount_opt;
a2595b8a 4577 unsigned long s_mount_opt2;
08cefc7a
EB		 4578 kuid_t s_resuid;
4579 kgid_t s_resgid;
673c6100
TT		 4580 unsigned long s_commit_interval;
4581 u32 s_min_batch_time, s_max_batch_time;
4582#ifdef CONFIG_QUOTA
4583 int s_jquota_fmt;
a2d4a646 4584 char *s_qf_names[EXT4_MAXQUOTAS];
673c6100
TT		 4585#endif
4586};
4587
2b2d6d01 4588static int ext4_remount(struct super_block *sb, int *flags, char *data)
ac27a0ec 4589{
2b2d6d01 4590 struct ext4_super_block *es;
617ba13b 4591 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4592 unsigned long old_sb_flags;
617ba13b 4593 struct ext4_mount_options old_opts;
c79d967d 4594 int enable_quota = 0;
8a266467 4595 ext4_group_t g;
b3881f74 4596 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
c5e06d10 4597 int err = 0;
ac27a0ec 4598#ifdef CONFIG_QUOTA
03dafb5f 4599 int i, j;
ac27a0ec 4600#endif
d4c402d9 4601 char *orig_data = kstrdup(data, GFP_KERNEL);
ac27a0ec
DK		 4602
4603 /* Store the original options */
4604 old_sb_flags = sb->s_flags;
4605 old_opts.s_mount_opt = sbi->s_mount_opt;
a2595b8a 4606 old_opts.s_mount_opt2 = sbi->s_mount_opt2;
ac27a0ec
DK		 4607 old_opts.s_resuid = sbi->s_resuid;
4608 old_opts.s_resgid = sbi->s_resgid;
4609 old_opts.s_commit_interval = sbi->s_commit_interval;
30773840
TT		 4610 old_opts.s_min_batch_time = sbi->s_min_batch_time;
4611 old_opts.s_max_batch_time = sbi->s_max_batch_time;
ac27a0ec
DK		 4612#ifdef CONFIG_QUOTA
4613 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
a2d4a646 4614 for (i = 0; i < EXT4_MAXQUOTAS; i++)
03dafb5f
CG		 4615 if (sbi->s_qf_names[i]) {
4616 old_opts.s_qf_names[i] = kstrdup(sbi->s_qf_names[i],
4617 GFP_KERNEL);
4618 if (!old_opts.s_qf_names[i]) {
4619 for (j = 0; j < i; j++)
4620 kfree(old_opts.s_qf_names[j]);
3e36a163 4621 kfree(orig_data);
03dafb5f
CG		 4622 return -ENOMEM;
4623 }
4624 } else
4625 old_opts.s_qf_names[i] = NULL;
ac27a0ec 4626#endif
b3881f74
TT		 4627 if (sbi->s_journal && sbi->s_journal->j_task->io_context)
4628 journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
ac27a0ec 4629
661aa520 4630 if (!parse_options(data, sb, NULL, &journal_ioprio, 1)) {
ac27a0ec
DK		 4631 err = -EINVAL;
4632 goto restore_opts;
4633 }
4634
6b992ff2 4635 if ((old_opts.s_mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) ^
c6d3d56d
DW		 4636 test_opt(sb, JOURNAL_CHECKSUM)) {
4637 ext4_msg(sb, KERN_ERR, "changing journal_checksum "
2d5b86e0
ES		 4638 "during remount not supported; ignoring");
4639 sbi->s_mount_opt ^= EXT4_MOUNT_JOURNAL_CHECKSUM;
6b992ff2
DW		 4640 }
4641
6ae6514b
PS		 4642 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
4643 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
4644 ext4_msg(sb, KERN_ERR, "can't mount with "
4645 "both data=journal and delalloc");
4646 err = -EINVAL;
4647 goto restore_opts;
4648 }
4649 if (test_opt(sb, DIOREAD_NOLOCK)) {
4650 ext4_msg(sb, KERN_ERR, "can't mount with "
4651 "both data=journal and dioread_nolock");
4652 err = -EINVAL;
4653 goto restore_opts;
4654 }
923ae0ff
RZ		 4655 if (test_opt(sb, DAX)) {
4656 ext4_msg(sb, KERN_ERR, "can't mount with "
4657 "both data=journal and dax");
4658 err = -EINVAL;
4659 goto restore_opts;
4660 }
4661 }
4662
4663 if ((sbi->s_mount_opt ^ old_opts.s_mount_opt) & EXT4_MOUNT_DAX) {
4664 ext4_msg(sb, KERN_WARNING, "warning: refusing change of "
4665 "dax flag with busy inodes while remounting");
4666 sbi->s_mount_opt ^= EXT4_MOUNT_DAX;
6ae6514b
PS		 4667 }
4668
4ab2f15b 4669 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
c67d859e 4670 ext4_abort(sb, "Abort forced by user");
ac27a0ec
DK		 4671
4672 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
482a7425 4673 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec
DK		 4674
4675 es = sbi->s_es;
4676
b3881f74 4677 if (sbi->s_journal) {
0390131b 4678 ext4_init_journal_params(sb, sbi->s_journal);
b3881f74
TT		 4679 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
4680 }
ac27a0ec 4681
a2fd66d0
TT		 4682 if (*flags & MS_LAZYTIME)
4683 sb->s_flags |= MS_LAZYTIME;
4684
661aa520 4685 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
4ab2f15b 4686 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) {
ac27a0ec
DK		 4687 err = -EROFS;
4688 goto restore_opts;
4689 }
4690
4691 if (*flags & MS_RDONLY) {
38c03b34
TT		 4692 err = sync_filesystem(sb);
4693 if (err < 0)
4694 goto restore_opts;
0f0dd62f
CH		 4695 err = dquot_suspend(sb, -1);
4696 if (err < 0)
c79d967d 4697 goto restore_opts;
c79d967d 4698
ac27a0ec
DK		 4699 /*
4700 * First of all, the unconditional stuff we have to do
4701 * to disable replay of the journal when we next remount
4702 */
4703 sb->s_flags |= MS_RDONLY;
4704
4705 /*
4706 * OK, test if we are remounting a valid rw partition
4707 * readonly, and if so set the rdonly flag and then
4708 * mark the partition as valid again.
4709 */
617ba13b
MC		 4710 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
4711 (sbi->s_mount_state & EXT4_VALID_FS))
ac27a0ec
DK		 4712 es->s_state = cpu_to_le16(sbi->s_mount_state);
4713
a63c9eb2 4714 if (sbi->s_journal)
0390131b 4715 ext4_mark_recovery_complete(sb, es);
ac27a0ec 4716 } else {
a13fb1a4 4717 /* Make sure we can mount this feature set readwrite */
e2b911c5 4718 if (ext4_has_feature_readonly(sb) ||
2cb5cc8b 4719 !ext4_feature_set_ok(sb, 0)) {
ac27a0ec
DK		 4720 err = -EROFS;
4721 goto restore_opts;
4722 }
8a266467
TT		 4723 /*
4724 * Make sure the group descriptor checksums
0b8e58a1 4725 * are sane. If they aren't, refuse to remount r/w.
8a266467
TT		 4726 */
4727 for (g = 0; g < sbi->s_groups_count; g++) {
4728 struct ext4_group_desc *gdp =
4729 ext4_get_group_desc(sb, g, NULL);
4730
feb0ab32 4731 if (!ext4_group_desc_csum_verify(sb, g, gdp)) {
b31e1552
ES		 4732 ext4_msg(sb, KERN_ERR,
4733 "ext4_remount: Checksum for group %u failed (%u!=%u)",
e2b911c5 4734 g, le16_to_cpu(ext4_group_desc_csum(sb, g, gdp)),
8a266467 4735 le16_to_cpu(gdp->bg_checksum));
6a797d27 4736 err = -EFSBADCRC;
8a266467
TT		 4737 goto restore_opts;
4738 }
4739 }
4740
ead6596b
ES		 4741 /*
4742 * If we have an unprocessed orphan list hanging
4743 * around from a previously readonly bdev mount,
4744 * require a full umount/remount for now.
4745 */
4746 if (es->s_last_orphan) {
b31e1552 4747 ext4_msg(sb, KERN_WARNING, "Couldn't "
ead6596b
ES		 4748 "remount RDWR because of unprocessed "
4749 "orphan inode list. Please "
b31e1552 4750 "umount/remount instead");
ead6596b
ES		 4751 err = -EINVAL;
4752 goto restore_opts;
4753 }
4754
ac27a0ec
DK		 4755 /*
4756 * Mounting a RDONLY partition read-write, so reread
4757 * and store the current valid flag. (It may have
4758 * been changed by e2fsck since we originally mounted
4759 * the partition.)
4760 */
0390131b
FM		 4761 if (sbi->s_journal)
4762 ext4_clear_journal_err(sb, es);
ac27a0ec 4763 sbi->s_mount_state = le16_to_cpu(es->s_state);
2b2d6d01 4764 if (!ext4_setup_super(sb, es, 0))
ac27a0ec 4765 sb->s_flags &= ~MS_RDONLY;
e2b911c5 4766 if (ext4_has_feature_mmp(sb))
c5e06d10
JL		 4767 if (ext4_multi_mount_protect(sb,
4768 le64_to_cpu(es->s_mmp_block))) {
4769 err = -EROFS;
4770 goto restore_opts;
4771 }
c79d967d 4772 enable_quota = 1;
ac27a0ec
DK		 4773 }
4774 }
bfff6873
LC		 4775
4776 /*
4777 * Reinitialize lazy itable initialization thread based on
4778 * current settings
4779 */
4780 if ((sb->s_flags & MS_RDONLY) || !test_opt(sb, INIT_INODE_TABLE))
4781 ext4_unregister_li_request(sb);
4782 else {
4783 ext4_group_t first_not_zeroed;
4784 first_not_zeroed = ext4_has_uninit_itable(sb);
4785 ext4_register_li_request(sb, first_not_zeroed);
4786 }
4787
6fd058f7 4788 ext4_setup_system_zone(sb);
d096ad0f 4789 if (sbi->s_journal == NULL && !(old_sb_flags & MS_RDONLY))
e2d67052 4790 ext4_commit_super(sb, 1);
0390131b 4791
ac27a0ec
DK		 4792#ifdef CONFIG_QUOTA
4793 /* Release old quota file names */
a2d4a646 4794 for (i = 0; i < EXT4_MAXQUOTAS; i++)
03dafb5f 4795 kfree(old_opts.s_qf_names[i]);
7c319d32
AK		 4796 if (enable_quota) {
4797 if (sb_any_quota_suspended(sb))
4798 dquot_resume(sb, -1);
e2b911c5 4799 else if (ext4_has_feature_quota(sb)) {
7c319d32 4800 err = ext4_enable_quotas(sb);
07724f98 4801 if (err)
7c319d32 4802 goto restore_opts;
7c319d32
AK		 4803 }
4804 }
ac27a0ec 4805#endif
d4c402d9 4806
a26f4992 4807 *flags = (*flags & ~MS_LAZYTIME) | (sb->s_flags & MS_LAZYTIME);
d4c402d9
CW		 4808 ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s", orig_data);
4809 kfree(orig_data);
ac27a0ec 4810 return 0;
0b8e58a1 4811
ac27a0ec
DK		 4812restore_opts:
4813 sb->s_flags = old_sb_flags;
4814 sbi->s_mount_opt = old_opts.s_mount_opt;
a2595b8a 4815 sbi->s_mount_opt2 = old_opts.s_mount_opt2;
ac27a0ec
DK		 4816 sbi->s_resuid = old_opts.s_resuid;
4817 sbi->s_resgid = old_opts.s_resgid;
4818 sbi->s_commit_interval = old_opts.s_commit_interval;
30773840
TT		 4819 sbi->s_min_batch_time = old_opts.s_min_batch_time;
4820 sbi->s_max_batch_time = old_opts.s_max_batch_time;
ac27a0ec
DK		 4821#ifdef CONFIG_QUOTA
4822 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
a2d4a646 4823 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
03dafb5f 4824 kfree(sbi->s_qf_names[i]);
ac27a0ec
DK		 4825 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
4826 }
4827#endif
d4c402d9 4828 kfree(orig_data);
ac27a0ec
DK		 4829 return err;
4830}
4831
689c958c
LX		 4832#ifdef CONFIG_QUOTA
4833static int ext4_statfs_project(struct super_block *sb,
4834 kprojid_t projid, struct kstatfs *buf)
4835{
4836 struct kqid qid;
4837 struct dquot *dquot;
4838 u64 limit;
4839 u64 curblock;
4840
4841 qid = make_kqid_projid(projid);
4842 dquot = dqget(sb, qid);
4843 if (IS_ERR(dquot))
4844 return PTR_ERR(dquot);
4845 spin_lock(&dq_data_lock);
4846
4847 limit = (dquot->dq_dqb.dqb_bsoftlimit ?
4848 dquot->dq_dqb.dqb_bsoftlimit :
4849 dquot->dq_dqb.dqb_bhardlimit) >> sb->s_blocksize_bits;
4850 if (limit && buf->f_blocks > limit) {
4851 curblock = dquot->dq_dqb.dqb_curspace >> sb->s_blocksize_bits;
4852 buf->f_blocks = limit;
4853 buf->f_bfree = buf->f_bavail =
4854 (buf->f_blocks > curblock) ?
4855 (buf->f_blocks - curblock) : 0;
4856 }
4857
4858 limit = dquot->dq_dqb.dqb_isoftlimit ?
4859 dquot->dq_dqb.dqb_isoftlimit :
4860 dquot->dq_dqb.dqb_ihardlimit;
4861 if (limit && buf->f_files > limit) {
4862 buf->f_files = limit;
4863 buf->f_ffree =
4864 (buf->f_files > dquot->dq_dqb.dqb_curinodes) ?
4865 (buf->f_files - dquot->dq_dqb.dqb_curinodes) : 0;
4866 }
4867
4868 spin_unlock(&dq_data_lock);
4869 dqput(dquot);
4870 return 0;
4871}
4872#endif
4873
2b2d6d01 4874static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
ac27a0ec
DK		 4875{
4876 struct super_block *sb = dentry->d_sb;
617ba13b
MC		 4877 struct ext4_sb_info *sbi = EXT4_SB(sb);
4878 struct ext4_super_block *es = sbi->s_es;
27dd4385 4879 ext4_fsblk_t overhead = 0, resv_blocks;
960cc398 4880 u64 fsid;
d02a9391 4881 s64 bfree;
27dd4385 4882 resv_blocks = EXT4_C2B(sbi, atomic64_read(&sbi->s_resv_clusters));
ac27a0ec 4883
952fc18e
TT		 4884 if (!test_opt(sb, MINIX_DF))
4885 overhead = sbi->s_overhead;
ac27a0ec 4886
617ba13b 4887 buf->f_type = EXT4_SUPER_MAGIC;
ac27a0ec 4888 buf->f_bsize = sb->s_blocksize;
b72f78cb 4889 buf->f_blocks = ext4_blocks_count(es) - EXT4_C2B(sbi, overhead);
57042651
TT		 4890 bfree = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) -
4891 percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter);
d02a9391 4892 /* prevent underflow in case that few free space is available */
57042651 4893 buf->f_bfree = EXT4_C2B(sbi, max_t(s64, bfree, 0));
27dd4385
LC		 4894 buf->f_bavail = buf->f_bfree -
4895 (ext4_r_blocks_count(es) + resv_blocks);
4896 if (buf->f_bfree < (ext4_r_blocks_count(es) + resv_blocks))
ac27a0ec
DK		 4897 buf->f_bavail = 0;
4898 buf->f_files = le32_to_cpu(es->s_inodes_count);
52d9f3b4 4899 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
617ba13b 4900 buf->f_namelen = EXT4_NAME_LEN;
960cc398
PE		 4901 fsid = le64_to_cpup((void *)es->s_uuid) ^
4902 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
4903 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
4904 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
0b8e58a1 4905
689c958c
LX		 4906#ifdef CONFIG_QUOTA
4907 if (ext4_test_inode_flag(dentry->d_inode, EXT4_INODE_PROJINHERIT) &&
4908 sb_has_quota_limits_enabled(sb, PRJQUOTA))
4909 ext4_statfs_project(sb, EXT4_I(dentry->d_inode)->i_projid, buf);
4910#endif
ac27a0ec
DK		 4911 return 0;
4912}
4913
0b8e58a1
AD		 4914/* Helper function for writing quotas on sync - we need to start transaction
4915 * before quota file is locked for write. Otherwise the are possible deadlocks:
ac27a0ec 4916 * Process 1 Process 2
617ba13b 4917 * ext4_create() quota_sync()
a269eb18 4918 * jbd2_journal_start() write_dquot()
871a2931 4919 * dquot_initialize() down(dqio_mutex)
dab291af 4920 * down(dqio_mutex) jbd2_journal_start()
ac27a0ec
DK		 4921 *
4922 */
4923
4924#ifdef CONFIG_QUOTA
4925
4926static inline struct inode *dquot_to_inode(struct dquot *dquot)
4927{
4c376dca 4928 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_id.type];
ac27a0ec
DK		 4929}
4930
617ba13b 4931static int ext4_write_dquot(struct dquot *dquot)
ac27a0ec
DK		 4932{
4933 int ret, err;
4934 handle_t *handle;
4935 struct inode *inode;
4936
4937 inode = dquot_to_inode(dquot);
9924a92a 4938 handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
0b8e58a1 4939 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 4940 if (IS_ERR(handle))
4941 return PTR_ERR(handle);
4942 ret = dquot_commit(dquot);
617ba13b 4943 err = ext4_journal_stop(handle);
ac27a0ec
DK		 4944 if (!ret)
4945 ret = err;
4946 return ret;
4947}
4948
617ba13b 4949static int ext4_acquire_dquot(struct dquot *dquot)
ac27a0ec
DK		 4950{
4951 int ret, err;
4952 handle_t *handle;
4953
9924a92a 4954 handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
0b8e58a1 4955 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 4956 if (IS_ERR(handle))
4957 return PTR_ERR(handle);
4958 ret = dquot_acquire(dquot);
617ba13b 4959 err = ext4_journal_stop(handle);
ac27a0ec
DK		 4960 if (!ret)
4961 ret = err;
4962 return ret;
4963}
4964
617ba13b 4965static int ext4_release_dquot(struct dquot *dquot)
ac27a0ec
DK		 4966{
4967 int ret, err;
4968 handle_t *handle;
4969
9924a92a 4970 handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
0b8e58a1 4971 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
9c3013e9
JK		 4972 if (IS_ERR(handle)) {
4973 /* Release dquot anyway to avoid endless cycle in dqput() */
4974 dquot_release(dquot);
ac27a0ec 4975 return PTR_ERR(handle);
9c3013e9 4976 }
ac27a0ec 4977 ret = dquot_release(dquot);
617ba13b 4978 err = ext4_journal_stop(handle);
ac27a0ec
DK		 4979 if (!ret)
4980 ret = err;
4981 return ret;
4982}
4983
617ba13b 4984static int ext4_mark_dquot_dirty(struct dquot *dquot)
ac27a0ec 4985{
262b4662
JK		 4986 struct super_block *sb = dquot->dq_sb;
4987 struct ext4_sb_info *sbi = EXT4_SB(sb);
4988
2c8be6b2 4989 /* Are we journaling quotas? */
e2b911c5 4990 if (ext4_has_feature_quota(sb) ||
262b4662 4991 sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
ac27a0ec 4992 dquot_mark_dquot_dirty(dquot);
617ba13b 4993 return ext4_write_dquot(dquot);
ac27a0ec
DK		 4994 } else {
4995 return dquot_mark_dquot_dirty(dquot);
4996 }
4997}
4998
617ba13b 4999static int ext4_write_info(struct super_block *sb, int type)
ac27a0ec
DK		 5000{
5001 int ret, err;
5002 handle_t *handle;
5003
5004 /* Data block + inode block */
2b0143b5 5005 handle = ext4_journal_start(d_inode(sb->s_root), EXT4_HT_QUOTA, 2);
ac27a0ec
DK		 5006 if (IS_ERR(handle))
5007 return PTR_ERR(handle);
5008 ret = dquot_commit_info(sb, type);
617ba13b 5009 err = ext4_journal_stop(handle);
ac27a0ec
DK		 5010 if (!ret)
5011 ret = err;
5012 return ret;
5013}
5014
5015/*
5016 * Turn on quotas during mount time - we need to find
5017 * the quota file and such...
5018 */
617ba13b 5019static int ext4_quota_on_mount(struct super_block *sb, int type)
ac27a0ec 5020{
287a8095
CH		 5021 return dquot_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
5022 EXT4_SB(sb)->s_jquota_fmt, type);
ac27a0ec
DK		 5023}
5024
5025/*
5026 * Standard function to be called on quota_on
5027 */
617ba13b 5028static int ext4_quota_on(struct super_block *sb, int type, int format_id,
f00c9e44 5029 struct path *path)
ac27a0ec
DK		 5030{
5031 int err;
ac27a0ec
DK		 5032
5033 if (!test_opt(sb, QUOTA))
5034 return -EINVAL;
0623543b 5035
ac27a0ec 5036 /* Quotafile not on the same filesystem? */
d8c9584e 5037 if (path->dentry->d_sb != sb)
ac27a0ec 5038 return -EXDEV;
0623543b
JK		 5039 /* Journaling quota? */
5040 if (EXT4_SB(sb)->s_qf_names[type]) {
2b2d6d01 5041 /* Quotafile not in fs root? */
f00c9e44 5042 if (path->dentry->d_parent != sb->s_root)
b31e1552
ES		 5043 ext4_msg(sb, KERN_WARNING,
5044 "Quota file not on filesystem root. "
5045 "Journaled quota will not work");
2b2d6d01 5046 }
0623543b
JK		 5047
5048 /*
5049 * When we journal data on quota file, we have to flush journal to see
5050 * all updates to the file when we bypass pagecache...
5051 */
0390131b 5052 if (EXT4_SB(sb)->s_journal &&
2b0143b5 5053 ext4_should_journal_data(d_inode(path->dentry))) {
0623543b
JK		 5054 /*
5055 * We don't need to lock updates but journal_flush() could
5056 * otherwise be livelocked...
5057 */
5058 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
7ffe1ea8 5059 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
0623543b 5060 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
f00c9e44 5061 if (err)
7ffe1ea8 5062 return err;
0623543b
JK		 5063 }
5064
f00c9e44 5065 return dquot_quota_on(sb, type, format_id, path);
ac27a0ec
DK		 5066}
5067
7c319d32
AK		 5068static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
5069 unsigned int flags)
5070{
5071 int err;
5072 struct inode *qf_inode;
a2d4a646 5073 unsigned long qf_inums[EXT4_MAXQUOTAS] = {
7c319d32 5074 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
689c958c
LX		 5075 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum),
5076 le32_to_cpu(EXT4_SB(sb)->s_es->s_prj_quota_inum)
7c319d32
AK		 5077 };
5078
e2b911c5 5079 BUG_ON(!ext4_has_feature_quota(sb));
7c319d32
AK		 5080
5081 if (!qf_inums[type])
5082 return -EPERM;
5083
5084 qf_inode = ext4_iget(sb, qf_inums[type]);
5085 if (IS_ERR(qf_inode)) {
5086 ext4_error(sb, "Bad quota inode # %lu", qf_inums[type]);
5087 return PTR_ERR(qf_inode);
5088 }
5089
bcb13850
JK		 5090 /* Don't account quota for quota files to avoid recursion */
5091 qf_inode->i_flags |= S_NOQUOTA;
7c319d32
AK		 5092 err = dquot_enable(qf_inode, type, format_id, flags);
5093 iput(qf_inode);
5094
5095 return err;
5096}
5097
5098/* Enable usage tracking for all quota types. */
5099static int ext4_enable_quotas(struct super_block *sb)
5100{
5101 int type, err = 0;
a2d4a646 5102 unsigned long qf_inums[EXT4_MAXQUOTAS] = {
7c319d32 5103 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
689c958c
LX		 5104 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum),
5105 le32_to_cpu(EXT4_SB(sb)->s_es->s_prj_quota_inum)
7c319d32
AK		 5106 };
5107
5108 sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE;
a2d4a646 5109 for (type = 0; type < EXT4_MAXQUOTAS; type++) {
7c319d32
AK		 5110 if (qf_inums[type]) {
5111 err = ext4_quota_enable(sb, type, QFMT_VFS_V1,
5112 DQUOT_USAGE_ENABLED);
5113 if (err) {
5114 ext4_warning(sb,
72ba7450
TT		 5115 "Failed to enable quota tracking "
5116 "(type=%d, err=%d). Please run "
5117 "e2fsck to fix.", type, err);
7c319d32
AK		 5118 return err;
5119 }
5120 }
5121 }
5122 return 0;
5123}
5124
ca0e05e4
DM		 5125static int ext4_quota_off(struct super_block *sb, int type)
5126{
21f97697
JK		 5127 struct inode *inode = sb_dqopt(sb)->files[type];
5128 handle_t *handle;
5129
87009d86
DM		 5130 /* Force all delayed allocation blocks to be allocated.
5131 * Caller already holds s_umount sem */
5132 if (test_opt(sb, DELALLOC))
ca0e05e4 5133 sync_filesystem(sb);
ca0e05e4 5134
0b268590
AG		 5135 if (!inode)
5136 goto out;
5137
21f97697
JK		 5138 /* Update modification times of quota files when userspace can
5139 * start looking at them */
9924a92a 5140 handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1);
21f97697
JK		 5141 if (IS_ERR(handle))
5142 goto out;
5143 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
5144 ext4_mark_inode_dirty(handle, inode);
5145 ext4_journal_stop(handle);
5146
5147out:
ca0e05e4
DM		 5148 return dquot_quota_off(sb, type);
5149}
5150
ac27a0ec
DK		 5151/* Read data from quotafile - avoid pagecache and such because we cannot afford
5152 * acquiring the locks... As quota files are never truncated and quota code
25985edc 5153 * itself serializes the operations (and no one else should touch the files)
ac27a0ec 5154 * we don't have to be afraid of races */
617ba13b 5155static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec
DK		 5156 size_t len, loff_t off)
5157{
5158 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 5159 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 5160 int offset = off & (sb->s_blocksize - 1);
5161 int tocopy;
5162 size_t toread;
5163 struct buffer_head *bh;
5164 loff_t i_size = i_size_read(inode);
5165
5166 if (off > i_size)
5167 return 0;
5168 if (off+len > i_size)
5169 len = i_size-off;
5170 toread = len;
5171 while (toread > 0) {
5172 tocopy = sb->s_blocksize - offset < toread ?
5173 sb->s_blocksize - offset : toread;
1c215028
TT		 5174 bh = ext4_bread(NULL, inode, blk, 0);
5175 if (IS_ERR(bh))
5176 return PTR_ERR(bh);
ac27a0ec
DK		 5177 if (!bh) /* A hole? */
5178 memset(data, 0, tocopy);
5179 else
5180 memcpy(data, bh->b_data+offset, tocopy);
5181 brelse(bh);
5182 offset = 0;
5183 toread -= tocopy;
5184 data += tocopy;
5185 blk++;
5186 }
5187 return len;
5188}
5189
5190/* Write to quotafile (we know the transaction is already started and has
5191 * enough credits) */
617ba13b 5192static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec
DK		 5193 const char *data, size_t len, loff_t off)
5194{
5195 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 5196 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
1c215028 5197 int err, offset = off & (sb->s_blocksize - 1);
c5e298ae 5198 int retries = 0;
ac27a0ec
DK		 5199 struct buffer_head *bh;
5200 handle_t *handle = journal_current_handle();
5201
0390131b 5202 if (EXT4_SB(sb)->s_journal && !handle) {
b31e1552
ES		 5203 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
5204 " cancelled because transaction is not started",
9c3013e9
JK		 5205 (unsigned long long)off, (unsigned long long)len);
5206 return -EIO;
5207 }
67eeb568
DM		 5208 /*
5209 * Since we account only one data block in transaction credits,
5210 * then it is impossible to cross a block boundary.
5211 */
5212 if (sb->s_blocksize - offset < len) {
5213 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
5214 " cancelled because not block aligned",
5215 (unsigned long long)off, (unsigned long long)len);
5216 return -EIO;
5217 }
5218
c5e298ae
TT		 5219 do {
5220 bh = ext4_bread(handle, inode, blk,
5221 EXT4_GET_BLOCKS_CREATE |
5222 EXT4_GET_BLOCKS_METADATA_NOFAIL);
5223 } while (IS_ERR(bh) && (PTR_ERR(bh) == -ENOSPC) &&
5224 ext4_should_retry_alloc(inode->i_sb, &retries));
1c215028
TT		 5225 if (IS_ERR(bh))
5226 return PTR_ERR(bh);
67eeb568
DM		 5227 if (!bh)
5228 goto out;
5d601255 5229 BUFFER_TRACE(bh, "get write access");
62d2b5f2
JK		 5230 err = ext4_journal_get_write_access(handle, bh);
5231 if (err) {
5232 brelse(bh);
1c215028 5233 return err;
ac27a0ec 5234 }
67eeb568
DM		 5235 lock_buffer(bh);
5236 memcpy(bh->b_data+offset, data, len);
5237 flush_dcache_page(bh->b_page);
5238 unlock_buffer(bh);
62d2b5f2 5239 err = ext4_handle_dirty_metadata(handle, NULL, bh);
67eeb568 5240 brelse(bh);
ac27a0ec 5241out:
67eeb568
DM		 5242 if (inode->i_size < off + len) {
5243 i_size_write(inode, off + len);
617ba13b 5244 EXT4_I(inode)->i_disksize = inode->i_size;
21f97697 5245 ext4_mark_inode_dirty(handle, inode);
ac27a0ec 5246 }
67eeb568 5247 return len;
ac27a0ec
DK		 5248}
5249
5250#endif
5251
152a0836
AV		 5252static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
5253 const char *dev_name, void *data)
ac27a0ec 5254{
152a0836 5255 return mount_bdev(fs_type, flags, dev_name, data, ext4_fill_super);
ac27a0ec
DK		 5256}
5257
c290ea01 5258#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2)
24b58424
TT		 5259static inline void register_as_ext2(void)
5260{
5261 int err = register_filesystem(&ext2_fs_type);
5262 if (err)
5263 printk(KERN_WARNING
5264 "EXT4-fs: Unable to register as ext2 (%d)\n", err);
5265}
5266
5267static inline void unregister_as_ext2(void)
5268{
5269 unregister_filesystem(&ext2_fs_type);
5270}
2035e776
TT		 5271
5272static inline int ext2_feature_set_ok(struct super_block *sb)
5273{
e2b911c5 5274 if (ext4_has_unknown_ext2_incompat_features(sb))
2035e776
TT		 5275 return 0;
5276 if (sb->s_flags & MS_RDONLY)
5277 return 1;
e2b911c5 5278 if (ext4_has_unknown_ext2_ro_compat_features(sb))
2035e776
TT		 5279 return 0;
5280 return 1;
5281}
24b58424
TT		 5282#else
5283static inline void register_as_ext2(void) { }
5284static inline void unregister_as_ext2(void) { }
2035e776 5285static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; }
24b58424
TT		 5286#endif
5287
24b58424
TT		 5288static inline void register_as_ext3(void)
5289{
5290 int err = register_filesystem(&ext3_fs_type);
5291 if (err)
5292 printk(KERN_WARNING
5293 "EXT4-fs: Unable to register as ext3 (%d)\n", err);
5294}
5295
5296static inline void unregister_as_ext3(void)
5297{
5298 unregister_filesystem(&ext3_fs_type);
5299}
2035e776
TT		 5300
5301static inline int ext3_feature_set_ok(struct super_block *sb)
5302{
e2b911c5 5303 if (ext4_has_unknown_ext3_incompat_features(sb))
2035e776 5304 return 0;
e2b911c5 5305 if (!ext4_has_feature_journal(sb))
2035e776
TT		 5306 return 0;
5307 if (sb->s_flags & MS_RDONLY)
5308 return 1;
e2b911c5 5309 if (ext4_has_unknown_ext3_ro_compat_features(sb))
2035e776
TT		 5310 return 0;
5311 return 1;
5312}
24b58424 5313
03010a33
TT		 5314static struct file_system_type ext4_fs_type = {
5315 .owner = THIS_MODULE,
5316 .name = "ext4",
152a0836 5317 .mount = ext4_mount,
03010a33
TT		 5318 .kill_sb = kill_block_super,
5319 .fs_flags = FS_REQUIRES_DEV,
5320};
7f78e035 5321MODULE_ALIAS_FS("ext4");
03010a33 5322
e9e3bcec
ES		 5323/* Shared across all ext4 file systems */
5324wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
5325struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ];
5326
5dabfc78 5327static int __init ext4_init_fs(void)
ac27a0ec 5328{
e9e3bcec 5329 int i, err;
c9de560d 5330
e294a537 5331 ratelimit_state_init(&ext4_mount_msg_ratelimit, 30 * HZ, 64);
07c0c5d8
AV		 5332 ext4_li_info = NULL;
5333 mutex_init(&ext4_li_mtx);
5334
9a4c8019 5335 /* Build-time check for flags consistency */
12e9b892 5336 ext4_check_flag_values();
e9e3bcec
ES		 5337
5338 for (i = 0; i < EXT4_WQ_HASH_SZ; i++) {
5339 mutex_init(&ext4__aio_mutex[i]);
5340 init_waitqueue_head(&ext4__ioend_wq[i]);
5341 }
5342
51865fda 5343 err = ext4_init_es();
6fd058f7
TT		 5344 if (err)
5345 return err;
51865fda
ZL		 5346
5347 err = ext4_init_pageio();
5348 if (err)
b5799018 5349 goto out5;
51865fda 5350
5dabfc78 5351 err = ext4_init_system_zone();
bd2d0210 5352 if (err)
b5799018 5353 goto out4;
857ac889 5354
b5799018 5355 err = ext4_init_sysfs();
dd68314c 5356 if (err)
b5799018 5357 goto out3;
857ac889 5358
5dabfc78 5359 err = ext4_init_mballoc();
c9de560d
AT		 5360 if (err)
5361 goto out2;
9c191f70
M		 5362 else
5363 ext4_mballoc_ready = 1;
ac27a0ec
DK		 5364 err = init_inodecache();
5365 if (err)
5366 goto out1;
24b58424 5367 register_as_ext3();
2035e776 5368 register_as_ext2();
03010a33 5369 err = register_filesystem(&ext4_fs_type);
ac27a0ec
DK		 5370 if (err)
5371 goto out;
bfff6873 5372
ac27a0ec
DK		 5373 return 0;
5374out:
24b58424
TT		 5375 unregister_as_ext2();
5376 unregister_as_ext3();
ac27a0ec
DK		 5377 destroy_inodecache();
5378out1:
9c191f70 5379 ext4_mballoc_ready = 0;
5dabfc78 5380 ext4_exit_mballoc();
9c191f70 5381out2:
b5799018
TT		 5382 ext4_exit_sysfs();
5383out3:
5dabfc78 5384 ext4_exit_system_zone();
b5799018 5385out4:
5dabfc78 5386 ext4_exit_pageio();
b5799018 5387out5:
51865fda
ZL		 5388 ext4_exit_es();
5389
ac27a0ec
DK		 5390 return err;
5391}
5392
5dabfc78 5393static void __exit ext4_exit_fs(void)
ac27a0ec 5394{
e298e73b 5395 ext4_exit_crypto();
bfff6873 5396 ext4_destroy_lazyinit_thread();
24b58424
TT		 5397 unregister_as_ext2();
5398 unregister_as_ext3();
03010a33 5399 unregister_filesystem(&ext4_fs_type);
ac27a0ec 5400 destroy_inodecache();
5dabfc78 5401 ext4_exit_mballoc();
b5799018 5402 ext4_exit_sysfs();
5dabfc78
TT		 5403 ext4_exit_system_zone();
5404 ext4_exit_pageio();
dd12ed14 5405 ext4_exit_es();
ac27a0ec
DK		 5406}
5407
5408MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
83982b6f 5409MODULE_DESCRIPTION("Fourth Extended Filesystem");
ac27a0ec 5410MODULE_LICENSE("GPL");
5dabfc78
TT		 5411module_init(ext4_init_fs)
5412module_exit(ext4_exit_fs)