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ext4 crypto: simplify interfaces to directory entry insert functions
[deliverable/linux.git] / fs / ext4 / super.c
CommitLineData
ac27a0ec 1/*
617ba13b 2 * linux/fs/ext4/super.c
ac27a0ec
DK		 3 *
4 * Copyright (C) 1992, 1993, 1994, 1995
5 * Remy Card (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
DK		 999 0, (SLAB_RECLAIM_ACCOUNT|
1000 SLAB_MEM_SPREAD),
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
af5bc92d 1100#define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
2b2d6d01 1101#define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
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,
ac27a0ec
DK		 1134};
1135
0d54b217 1136static const struct quotactl_ops ext4_qctl_operations = {
617ba13b 1137 .quota_on = ext4_quota_on,
ca0e05e4 1138 .quota_off = ext4_quota_off,
287a8095 1139 .quota_sync = dquot_quota_sync,
0a240339 1140 .get_state = dquot_get_state,
287a8095
CH		 1141 .set_info = dquot_set_dqinfo,
1142 .get_dqblk = dquot_get_dqblk,
1143 .set_dqblk = dquot_set_dqblk
ac27a0ec
DK		 1144};
1145#endif
1146
ee9b6d61 1147static const struct super_operations ext4_sops = {
617ba13b
MC		 1148 .alloc_inode = ext4_alloc_inode,
1149 .destroy_inode = ext4_destroy_inode,
617ba13b
MC		 1150 .write_inode = ext4_write_inode,
1151 .dirty_inode = ext4_dirty_inode,
7ff9c073 1152 .drop_inode = ext4_drop_inode,
0930fcc1 1153 .evict_inode = ext4_evict_inode,
617ba13b 1154 .put_super = ext4_put_super,
617ba13b 1155 .sync_fs = ext4_sync_fs,
c4be0c1d
TS		 1156 .freeze_fs = ext4_freeze,
1157 .unfreeze_fs = ext4_unfreeze,
617ba13b
MC		 1158 .statfs = ext4_statfs,
1159 .remount_fs = ext4_remount,
617ba13b 1160 .show_options = ext4_show_options,
ac27a0ec 1161#ifdef CONFIG_QUOTA
617ba13b
MC		 1162 .quota_read = ext4_quota_read,
1163 .quota_write = ext4_quota_write,
96c7e0d9 1164 .get_dquots = ext4_get_dquots,
ac27a0ec 1165#endif
c39a7f84 1166 .bdev_try_to_free_page = bdev_try_to_free_page,
ac27a0ec
DK		 1167};
1168
39655164 1169static const struct export_operations ext4_export_ops = {
1b961ac0
CH		 1170 .fh_to_dentry = ext4_fh_to_dentry,
1171 .fh_to_parent = ext4_fh_to_parent,
617ba13b 1172 .get_parent = ext4_get_parent,
ac27a0ec
DK		 1173};
1174
1175enum {
1176 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
1177 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
72578c33 1178 Opt_nouid32, Opt_debug, Opt_removed,
ac27a0ec 1179 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
72578c33 1180 Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload,
ad4eec61
ES		 1181 Opt_commit, Opt_min_batch_time, Opt_max_batch_time, Opt_journal_dev,
1182 Opt_journal_path, Opt_journal_checksum, Opt_journal_async_commit,
ac27a0ec 1183 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
6ddb2447 1184 Opt_data_err_abort, Opt_data_err_ignore, Opt_test_dummy_encryption,
ac27a0ec 1185 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
5a20bdfc 1186 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
ee4a3fcd 1187 Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err,
923ae0ff 1188 Opt_usrquota, Opt_grpquota, Opt_i_version, Opt_dax,
1449032b 1189 Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_mblk_io_submit,
a26f4992 1190 Opt_lazytime, Opt_nolazytime,
1449032b 1191 Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity,
5328e635 1192 Opt_inode_readahead_blks, Opt_journal_ioprio,
744692dc 1193 Opt_dioread_nolock, Opt_dioread_lock,
fc6cb1cd 1194 Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable,
c6d3d56d 1195 Opt_max_dir_size_kb, Opt_nojournal_checksum,
ac27a0ec
DK		 1196};
1197
a447c093 1198static const match_table_t tokens = {
ac27a0ec
DK		 1199 {Opt_bsd_df, "bsddf"},
1200 {Opt_minix_df, "minixdf"},
1201 {Opt_grpid, "grpid"},
1202 {Opt_grpid, "bsdgroups"},
1203 {Opt_nogrpid, "nogrpid"},
1204 {Opt_nogrpid, "sysvgroups"},
1205 {Opt_resgid, "resgid=%u"},
1206 {Opt_resuid, "resuid=%u"},
1207 {Opt_sb, "sb=%u"},
1208 {Opt_err_cont, "errors=continue"},
1209 {Opt_err_panic, "errors=panic"},
1210 {Opt_err_ro, "errors=remount-ro"},
1211 {Opt_nouid32, "nouid32"},
ac27a0ec 1212 {Opt_debug, "debug"},
72578c33
TT		 1213 {Opt_removed, "oldalloc"},
1214 {Opt_removed, "orlov"},
ac27a0ec
DK		 1215 {Opt_user_xattr, "user_xattr"},
1216 {Opt_nouser_xattr, "nouser_xattr"},
1217 {Opt_acl, "acl"},
1218 {Opt_noacl, "noacl"},
e3bb52ae 1219 {Opt_noload, "norecovery"},
5a916be1 1220 {Opt_noload, "noload"},
72578c33
TT		 1221 {Opt_removed, "nobh"},
1222 {Opt_removed, "bh"},
ac27a0ec 1223 {Opt_commit, "commit=%u"},
30773840
TT		 1224 {Opt_min_batch_time, "min_batch_time=%u"},
1225 {Opt_max_batch_time, "max_batch_time=%u"},
ac27a0ec 1226 {Opt_journal_dev, "journal_dev=%u"},
ad4eec61 1227 {Opt_journal_path, "journal_path=%s"},
818d276c 1228 {Opt_journal_checksum, "journal_checksum"},
c6d3d56d 1229 {Opt_nojournal_checksum, "nojournal_checksum"},
818d276c 1230 {Opt_journal_async_commit, "journal_async_commit"},
ac27a0ec
DK		 1231 {Opt_abort, "abort"},
1232 {Opt_data_journal, "data=journal"},
1233 {Opt_data_ordered, "data=ordered"},
1234 {Opt_data_writeback, "data=writeback"},
5bf5683a
HK		 1235 {Opt_data_err_abort, "data_err=abort"},
1236 {Opt_data_err_ignore, "data_err=ignore"},
ac27a0ec
DK		 1237 {Opt_offusrjquota, "usrjquota="},
1238 {Opt_usrjquota, "usrjquota=%s"},
1239 {Opt_offgrpjquota, "grpjquota="},
1240 {Opt_grpjquota, "grpjquota=%s"},
1241 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
1242 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
5a20bdfc 1243 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
ac27a0ec
DK		 1244 {Opt_grpquota, "grpquota"},
1245 {Opt_noquota, "noquota"},
1246 {Opt_quota, "quota"},
1247 {Opt_usrquota, "usrquota"},
1248 {Opt_barrier, "barrier=%u"},
06705bff
TT		 1249 {Opt_barrier, "barrier"},
1250 {Opt_nobarrier, "nobarrier"},
25ec56b5 1251 {Opt_i_version, "i_version"},
923ae0ff 1252 {Opt_dax, "dax"},
c9de560d 1253 {Opt_stripe, "stripe=%u"},
64769240 1254 {Opt_delalloc, "delalloc"},
a26f4992
TT		 1255 {Opt_lazytime, "lazytime"},
1256 {Opt_nolazytime, "nolazytime"},
dd919b98 1257 {Opt_nodelalloc, "nodelalloc"},
36ade451
JK		 1258 {Opt_removed, "mblk_io_submit"},
1259 {Opt_removed, "nomblk_io_submit"},
6fd058f7
TT		 1260 {Opt_block_validity, "block_validity"},
1261 {Opt_noblock_validity, "noblock_validity"},
240799cd 1262 {Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
b3881f74 1263 {Opt_journal_ioprio, "journal_ioprio=%u"},
afd4672d 1264 {Opt_auto_da_alloc, "auto_da_alloc=%u"},
06705bff
TT		 1265 {Opt_auto_da_alloc, "auto_da_alloc"},
1266 {Opt_noauto_da_alloc, "noauto_da_alloc"},
744692dc
JZ		 1267 {Opt_dioread_nolock, "dioread_nolock"},
1268 {Opt_dioread_lock, "dioread_lock"},
5328e635
ES		 1269 {Opt_discard, "discard"},
1270 {Opt_nodiscard, "nodiscard"},
fc6cb1cd
TT		 1271 {Opt_init_itable, "init_itable=%u"},
1272 {Opt_init_itable, "init_itable"},
1273 {Opt_noinit_itable, "noinit_itable"},
df981d03 1274 {Opt_max_dir_size_kb, "max_dir_size_kb=%u"},
6ddb2447 1275 {Opt_test_dummy_encryption, "test_dummy_encryption"},
c7198b9c
TT		 1276 {Opt_removed, "check=none"}, /* mount option from ext2/3 */
1277 {Opt_removed, "nocheck"}, /* mount option from ext2/3 */
1278 {Opt_removed, "reservation"}, /* mount option from ext2/3 */
1279 {Opt_removed, "noreservation"}, /* mount option from ext2/3 */
1280 {Opt_removed, "journal=%u"}, /* mount option from ext2/3 */
f3f12faa 1281 {Opt_err, NULL},
ac27a0ec
DK		 1282};
1283
617ba13b 1284static ext4_fsblk_t get_sb_block(void **data)
ac27a0ec 1285{
617ba13b 1286 ext4_fsblk_t sb_block;
ac27a0ec
DK		 1287 char *options = (char *) *data;
1288
1289 if (!options || strncmp(options, "sb=", 3) != 0)
1290 return 1; /* Default location */
0b8e58a1 1291
ac27a0ec 1292 options += 3;
0b8e58a1 1293 /* TODO: use simple_strtoll with >32bit ext4 */
ac27a0ec
DK		 1294 sb_block = simple_strtoul(options, &options, 0);
1295 if (*options && *options != ',') {
4776004f 1296 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
ac27a0ec
DK		 1297 (char *) *data);
1298 return 1;
1299 }
1300 if (*options == ',')
1301 options++;
1302 *data = (void *) options;
0b8e58a1 1303
ac27a0ec
DK		 1304 return sb_block;
1305}
1306
b3881f74 1307#define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
437ca0fd
DM		 1308static char deprecated_msg[] = "Mount option \"%s\" will be removed by %s\n"
1309 "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
b3881f74 1310
56c50f11
DM		 1311#ifdef CONFIG_QUOTA
1312static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
1313{
1314 struct ext4_sb_info *sbi = EXT4_SB(sb);
1315 char *qname;
03dafb5f 1316 int ret = -1;
56c50f11
DM		 1317
1318 if (sb_any_quota_loaded(sb) &&
1319 !sbi->s_qf_names[qtype]) {
1320 ext4_msg(sb, KERN_ERR,
1321 "Cannot change journaled "
1322 "quota options when quota turned on");
57f73c2c 1323 return -1;
56c50f11 1324 }
e2b911c5 1325 if (ext4_has_feature_quota(sb)) {
262b4662
JK		 1326 ext4_msg(sb, KERN_ERR, "Cannot set journaled quota options "
1327 "when QUOTA feature is enabled");
1328 return -1;
1329 }
56c50f11
DM		 1330 qname = match_strdup(args);
1331 if (!qname) {
1332 ext4_msg(sb, KERN_ERR,
1333 "Not enough memory for storing quotafile name");
57f73c2c 1334 return -1;
56c50f11 1335 }
03dafb5f
CG		 1336 if (sbi->s_qf_names[qtype]) {
1337 if (strcmp(sbi->s_qf_names[qtype], qname) == 0)
1338 ret = 1;
1339 else
1340 ext4_msg(sb, KERN_ERR,
1341 "%s quota file already specified",
1342 QTYPE2NAME(qtype));
1343 goto errout;
56c50f11 1344 }
03dafb5f 1345 if (strchr(qname, '/')) {
56c50f11
DM		 1346 ext4_msg(sb, KERN_ERR,
1347 "quotafile must be on filesystem root");
03dafb5f 1348 goto errout;
56c50f11 1349 }
03dafb5f 1350 sbi->s_qf_names[qtype] = qname;
fd8c37ec 1351 set_opt(sb, QUOTA);
56c50f11 1352 return 1;
03dafb5f
CG		 1353errout:
1354 kfree(qname);
1355 return ret;
56c50f11
DM		 1356}
1357
1358static int clear_qf_name(struct super_block *sb, int qtype)
1359{
1360
1361 struct ext4_sb_info *sbi = EXT4_SB(sb);
1362
1363 if (sb_any_quota_loaded(sb) &&
1364 sbi->s_qf_names[qtype]) {
1365 ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options"
1366 " when quota turned on");
57f73c2c 1367 return -1;
56c50f11 1368 }
03dafb5f 1369 kfree(sbi->s_qf_names[qtype]);
56c50f11
DM		 1370 sbi->s_qf_names[qtype] = NULL;
1371 return 1;
1372}
1373#endif
1374
26092bf5
TT		 1375#define MOPT_SET 0x0001
1376#define MOPT_CLEAR 0x0002
1377#define MOPT_NOSUPPORT 0x0004
1378#define MOPT_EXPLICIT 0x0008
1379#define MOPT_CLEAR_ERR 0x0010
1380#define MOPT_GTE0 0x0020
ac27a0ec 1381#ifdef CONFIG_QUOTA
26092bf5
TT		 1382#define MOPT_Q 0
1383#define MOPT_QFMT 0x0040
1384#else
1385#define MOPT_Q MOPT_NOSUPPORT
1386#define MOPT_QFMT MOPT_NOSUPPORT
ac27a0ec 1387#endif
26092bf5 1388#define MOPT_DATAJ 0x0080
8dc0aa8c
TT		 1389#define MOPT_NO_EXT2 0x0100
1390#define MOPT_NO_EXT3 0x0200
1391#define MOPT_EXT4_ONLY (MOPT_NO_EXT2 | MOPT_NO_EXT3)
ad4eec61 1392#define MOPT_STRING 0x0400
26092bf5
TT		 1393
1394static const struct mount_opts {
1395 int token;
1396 int mount_opt;
1397 int flags;
1398} ext4_mount_opts[] = {
1399 {Opt_minix_df, EXT4_MOUNT_MINIX_DF, MOPT_SET},
1400 {Opt_bsd_df, EXT4_MOUNT_MINIX_DF, MOPT_CLEAR},
1401 {Opt_grpid, EXT4_MOUNT_GRPID, MOPT_SET},
1402 {Opt_nogrpid, EXT4_MOUNT_GRPID, MOPT_CLEAR},
26092bf5
TT		 1403 {Opt_block_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_SET},
1404 {Opt_noblock_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_CLEAR},
8dc0aa8c
TT		 1405 {Opt_dioread_nolock, EXT4_MOUNT_DIOREAD_NOLOCK,
1406 MOPT_EXT4_ONLY | MOPT_SET},
1407 {Opt_dioread_lock, EXT4_MOUNT_DIOREAD_NOLOCK,
1408 MOPT_EXT4_ONLY | MOPT_CLEAR},
26092bf5
TT		 1409 {Opt_discard, EXT4_MOUNT_DISCARD, MOPT_SET},
1410 {Opt_nodiscard, EXT4_MOUNT_DISCARD, MOPT_CLEAR},
8dc0aa8c
TT		 1411 {Opt_delalloc, EXT4_MOUNT_DELALLOC,
1412 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
1413 {Opt_nodelalloc, EXT4_MOUNT_DELALLOC,
59d9fa5c 1414 MOPT_EXT4_ONLY | MOPT_CLEAR},
c6d3d56d
DW		 1415 {Opt_nojournal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
1416 MOPT_EXT4_ONLY | MOPT_CLEAR},
8dc0aa8c 1417 {Opt_journal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
1e381f60 1418 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
26092bf5 1419 {Opt_journal_async_commit, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT |
8dc0aa8c 1420 EXT4_MOUNT_JOURNAL_CHECKSUM),
1e381f60 1421 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
8dc0aa8c 1422 {Opt_noload, EXT4_MOUNT_NOLOAD, MOPT_NO_EXT2 | MOPT_SET},
26092bf5
TT		 1423 {Opt_err_panic, EXT4_MOUNT_ERRORS_PANIC, MOPT_SET | MOPT_CLEAR_ERR},
1424 {Opt_err_ro, EXT4_MOUNT_ERRORS_RO, MOPT_SET | MOPT_CLEAR_ERR},
1425 {Opt_err_cont, EXT4_MOUNT_ERRORS_CONT, MOPT_SET | MOPT_CLEAR_ERR},
8dc0aa8c
TT		 1426 {Opt_data_err_abort, EXT4_MOUNT_DATA_ERR_ABORT,
1427 MOPT_NO_EXT2 | MOPT_SET},
1428 {Opt_data_err_ignore, EXT4_MOUNT_DATA_ERR_ABORT,
1429 MOPT_NO_EXT2 | MOPT_CLEAR},
26092bf5
TT		 1430 {Opt_barrier, EXT4_MOUNT_BARRIER, MOPT_SET},
1431 {Opt_nobarrier, EXT4_MOUNT_BARRIER, MOPT_CLEAR},
1432 {Opt_noauto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_SET},
1433 {Opt_auto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_CLEAR},
1434 {Opt_noinit_itable, EXT4_MOUNT_INIT_INODE_TABLE, MOPT_CLEAR},
1435 {Opt_commit, 0, MOPT_GTE0},
1436 {Opt_max_batch_time, 0, MOPT_GTE0},
1437 {Opt_min_batch_time, 0, MOPT_GTE0},
1438 {Opt_inode_readahead_blks, 0, MOPT_GTE0},
1439 {Opt_init_itable, 0, MOPT_GTE0},
923ae0ff 1440 {Opt_dax, EXT4_MOUNT_DAX, MOPT_SET},
26092bf5 1441 {Opt_stripe, 0, MOPT_GTE0},
0efb3b23
JK		 1442 {Opt_resuid, 0, MOPT_GTE0},
1443 {Opt_resgid, 0, MOPT_GTE0},
5ba92bcf
CM		 1444 {Opt_journal_dev, 0, MOPT_NO_EXT2 | MOPT_GTE0},
1445 {Opt_journal_path, 0, MOPT_NO_EXT2 | MOPT_STRING},
1446 {Opt_journal_ioprio, 0, MOPT_NO_EXT2 | MOPT_GTE0},
8dc0aa8c
TT		 1447 {Opt_data_journal, EXT4_MOUNT_JOURNAL_DATA, MOPT_NO_EXT2 | MOPT_DATAJ},
1448 {Opt_data_ordered, EXT4_MOUNT_ORDERED_DATA, MOPT_NO_EXT2 | MOPT_DATAJ},
1449 {Opt_data_writeback, EXT4_MOUNT_WRITEBACK_DATA,
1450 MOPT_NO_EXT2 | MOPT_DATAJ},
26092bf5
TT		 1451 {Opt_user_xattr, EXT4_MOUNT_XATTR_USER, MOPT_SET},
1452 {Opt_nouser_xattr, EXT4_MOUNT_XATTR_USER, MOPT_CLEAR},
03010a33 1453#ifdef CONFIG_EXT4_FS_POSIX_ACL
26092bf5
TT		 1454 {Opt_acl, EXT4_MOUNT_POSIX_ACL, MOPT_SET},
1455 {Opt_noacl, EXT4_MOUNT_POSIX_ACL, MOPT_CLEAR},
ac27a0ec 1456#else
26092bf5
TT		 1457 {Opt_acl, 0, MOPT_NOSUPPORT},
1458 {Opt_noacl, 0, MOPT_NOSUPPORT},
ac27a0ec 1459#endif
26092bf5
TT		 1460 {Opt_nouid32, EXT4_MOUNT_NO_UID32, MOPT_SET},
1461 {Opt_debug, EXT4_MOUNT_DEBUG, MOPT_SET},
1462 {Opt_quota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA, MOPT_SET | MOPT_Q},
1463 {Opt_usrquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA,
1464 MOPT_SET | MOPT_Q},
1465 {Opt_grpquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_GRPQUOTA,
1466 MOPT_SET | MOPT_Q},
1467 {Opt_noquota, (EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA |
1468 EXT4_MOUNT_GRPQUOTA), MOPT_CLEAR | MOPT_Q},
1469 {Opt_usrjquota, 0, MOPT_Q},
1470 {Opt_grpjquota, 0, MOPT_Q},
1471 {Opt_offusrjquota, 0, MOPT_Q},
1472 {Opt_offgrpjquota, 0, MOPT_Q},
1473 {Opt_jqfmt_vfsold, QFMT_VFS_OLD, MOPT_QFMT},
1474 {Opt_jqfmt_vfsv0, QFMT_VFS_V0, MOPT_QFMT},
1475 {Opt_jqfmt_vfsv1, QFMT_VFS_V1, MOPT_QFMT},
df981d03 1476 {Opt_max_dir_size_kb, 0, MOPT_GTE0},
6ddb2447 1477 {Opt_test_dummy_encryption, 0, MOPT_GTE0},
26092bf5
TT		 1478 {Opt_err, 0, 0}
1479};
1480
1481static int handle_mount_opt(struct super_block *sb, char *opt, int token,
1482 substring_t *args, unsigned long *journal_devnum,
1483 unsigned int *journal_ioprio, int is_remount)
1484{
1485 struct ext4_sb_info *sbi = EXT4_SB(sb);
1486 const struct mount_opts *m;
08cefc7a
EB		 1487 kuid_t uid;
1488 kgid_t gid;
26092bf5
TT		 1489 int arg = 0;
1490
57f73c2c
TT		 1491#ifdef CONFIG_QUOTA
1492 if (token == Opt_usrjquota)
1493 return set_qf_name(sb, USRQUOTA, &args[0]);
1494 else if (token == Opt_grpjquota)
1495 return set_qf_name(sb, GRPQUOTA, &args[0]);
1496 else if (token == Opt_offusrjquota)
1497 return clear_qf_name(sb, USRQUOTA);
1498 else if (token == Opt_offgrpjquota)
1499 return clear_qf_name(sb, GRPQUOTA);
1500#endif
26092bf5 1501 switch (token) {
f7048605
TT		 1502 case Opt_noacl:
1503 case Opt_nouser_xattr:
1504 ext4_msg(sb, KERN_WARNING, deprecated_msg, opt, "3.5");
1505 break;
26092bf5
TT		 1506 case Opt_sb:
1507 return 1; /* handled by get_sb_block() */
1508 case Opt_removed:
5f3633e3 1509 ext4_msg(sb, KERN_WARNING, "Ignoring removed %s option", opt);
26092bf5 1510 return 1;
26092bf5
TT		 1511 case Opt_abort:
1512 sbi->s_mount_flags |= EXT4_MF_FS_ABORTED;
1513 return 1;
1514 case Opt_i_version:
1515 sb->s_flags |= MS_I_VERSION;
1516 return 1;
a26f4992
TT		 1517 case Opt_lazytime:
1518 sb->s_flags |= MS_LAZYTIME;
1519 return 1;
1520 case Opt_nolazytime:
1521 sb->s_flags &= ~MS_LAZYTIME;
1522 return 1;
26092bf5
TT		 1523 }
1524
5f3633e3
JK		 1525 for (m = ext4_mount_opts; m->token != Opt_err; m++)
1526 if (token == m->token)
1527 break;
1528
1529 if (m->token == Opt_err) {
1530 ext4_msg(sb, KERN_ERR, "Unrecognized mount option \"%s\" "
1531 "or missing value", opt);
1532 return -1;
1533 }
1534
8dc0aa8c
TT		 1535 if ((m->flags & MOPT_NO_EXT2) && IS_EXT2_SB(sb)) {
1536 ext4_msg(sb, KERN_ERR,
1537 "Mount option \"%s\" incompatible with ext2", opt);
1538 return -1;
1539 }
1540 if ((m->flags & MOPT_NO_EXT3) && IS_EXT3_SB(sb)) {
1541 ext4_msg(sb, KERN_ERR,
1542 "Mount option \"%s\" incompatible with ext3", opt);
1543 return -1;
1544 }
1545
ad4eec61 1546 if (args->from && !(m->flags & MOPT_STRING) && match_int(args, &arg))
5f3633e3
JK		 1547 return -1;
1548 if (args->from && (m->flags & MOPT_GTE0) && (arg < 0))
1549 return -1;
c93cf2d7
DM		 1550 if (m->flags & MOPT_EXPLICIT) {
1551 if (m->mount_opt & EXT4_MOUNT_DELALLOC) {
1552 set_opt2(sb, EXPLICIT_DELALLOC);
1e381f60
DM		 1553 } else if (m->mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) {
1554 set_opt2(sb, EXPLICIT_JOURNAL_CHECKSUM);
c93cf2d7
DM		 1555 } else
1556 return -1;
1557 }
5f3633e3
JK		 1558 if (m->flags & MOPT_CLEAR_ERR)
1559 clear_opt(sb, ERRORS_MASK);
1560 if (token == Opt_noquota && sb_any_quota_loaded(sb)) {
1561 ext4_msg(sb, KERN_ERR, "Cannot change quota "
1562 "options when quota turned on");
1563 return -1;
1564 }
1565
1566 if (m->flags & MOPT_NOSUPPORT) {
1567 ext4_msg(sb, KERN_ERR, "%s option not supported", opt);
1568 } else if (token == Opt_commit) {
1569 if (arg == 0)
1570 arg = JBD2_DEFAULT_MAX_COMMIT_AGE;
1571 sbi->s_commit_interval = HZ * arg;
1572 } else if (token == Opt_max_batch_time) {
5f3633e3
JK		 1573 sbi->s_max_batch_time = arg;
1574 } else if (token == Opt_min_batch_time) {
1575 sbi->s_min_batch_time = arg;
1576 } else if (token == Opt_inode_readahead_blks) {
e33e60ea
JK		 1577 if (arg && (arg > (1 << 30) || !is_power_of_2(arg))) {
1578 ext4_msg(sb, KERN_ERR,
1579 "EXT4-fs: inode_readahead_blks must be "
1580 "0 or a power of 2 smaller than 2^31");
26092bf5 1581 return -1;
5f3633e3
JK		 1582 }
1583 sbi->s_inode_readahead_blks = arg;
1584 } else if (token == Opt_init_itable) {
1585 set_opt(sb, INIT_INODE_TABLE);
1586 if (!args->from)
1587 arg = EXT4_DEF_LI_WAIT_MULT;
1588 sbi->s_li_wait_mult = arg;
1589 } else if (token == Opt_max_dir_size_kb) {
1590 sbi->s_max_dir_size_kb = arg;
1591 } else if (token == Opt_stripe) {
1592 sbi->s_stripe = arg;
1593 } else if (token == Opt_resuid) {
1594 uid = make_kuid(current_user_ns(), arg);
1595 if (!uid_valid(uid)) {
1596 ext4_msg(sb, KERN_ERR, "Invalid uid value %d", arg);
26092bf5
TT		 1597 return -1;
1598 }
5f3633e3
JK		 1599 sbi->s_resuid = uid;
1600 } else if (token == Opt_resgid) {
1601 gid = make_kgid(current_user_ns(), arg);
1602 if (!gid_valid(gid)) {
1603 ext4_msg(sb, KERN_ERR, "Invalid gid value %d", arg);
1604 return -1;
1605 }
1606 sbi->s_resgid = gid;
1607 } else if (token == Opt_journal_dev) {
1608 if (is_remount) {
1609 ext4_msg(sb, KERN_ERR,
1610 "Cannot specify journal on remount");
1611 return -1;
1612 }
1613 *journal_devnum = arg;
ad4eec61
ES		 1614 } else if (token == Opt_journal_path) {
1615 char *journal_path;
1616 struct inode *journal_inode;
1617 struct path path;
1618 int error;
1619
1620 if (is_remount) {
1621 ext4_msg(sb, KERN_ERR,
1622 "Cannot specify journal on remount");
1623 return -1;
1624 }
1625 journal_path = match_strdup(&args[0]);
1626 if (!journal_path) {
1627 ext4_msg(sb, KERN_ERR, "error: could not dup "
1628 "journal device string");
1629 return -1;
1630 }
1631
1632 error = kern_path(journal_path, LOOKUP_FOLLOW, &path);
1633 if (error) {
1634 ext4_msg(sb, KERN_ERR, "error: could not find "
1635 "journal device path: error %d", error);
1636 kfree(journal_path);
1637 return -1;
1638 }
1639
2b0143b5 1640 journal_inode = d_inode(path.dentry);
ad4eec61
ES		 1641 if (!S_ISBLK(journal_inode->i_mode)) {
1642 ext4_msg(sb, KERN_ERR, "error: journal path %s "
1643 "is not a block device", journal_path);
1644 path_put(&path);
1645 kfree(journal_path);
1646 return -1;
1647 }
1648
1649 *journal_devnum = new_encode_dev(journal_inode->i_rdev);
1650 path_put(&path);
1651 kfree(journal_path);
5f3633e3
JK		 1652 } else if (token == Opt_journal_ioprio) {
1653 if (arg > 7) {
1654 ext4_msg(sb, KERN_ERR, "Invalid journal IO priority"
1655 " (must be 0-7)");
1656 return -1;
1657 }
1658 *journal_ioprio =
1659 IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, arg);
6ddb2447
TT		 1660 } else if (token == Opt_test_dummy_encryption) {
1661#ifdef CONFIG_EXT4_FS_ENCRYPTION
1662 sbi->s_mount_flags |= EXT4_MF_TEST_DUMMY_ENCRYPTION;
1663 ext4_msg(sb, KERN_WARNING,
1664 "Test dummy encryption mode enabled");
1665#else
1666 ext4_msg(sb, KERN_WARNING,
1667 "Test dummy encryption mount option ignored");
1668#endif
5f3633e3
JK		 1669 } else if (m->flags & MOPT_DATAJ) {
1670 if (is_remount) {
1671 if (!sbi->s_journal)
1672 ext4_msg(sb, KERN_WARNING, "Remounting file system with no journal so ignoring journalled data option");
1673 else if (test_opt(sb, DATA_FLAGS) != m->mount_opt) {
0efb3b23 1674 ext4_msg(sb, KERN_ERR,
26092bf5 1675 "Cannot change data mode on remount");
26092bf5 1676 return -1;
ac27a0ec 1677 }
26092bf5 1678 } else {
5f3633e3
JK		 1679 clear_opt(sb, DATA_FLAGS);
1680 sbi->s_mount_opt |= m->mount_opt;
ac27a0ec 1681 }
5f3633e3
JK		 1682#ifdef CONFIG_QUOTA
1683 } else if (m->flags & MOPT_QFMT) {
1684 if (sb_any_quota_loaded(sb) &&
1685 sbi->s_jquota_fmt != m->mount_opt) {
1686 ext4_msg(sb, KERN_ERR, "Cannot change journaled "
1687 "quota options when quota turned on");
1688 return -1;
1689 }
e2b911c5 1690 if (ext4_has_feature_quota(sb)) {
262b4662
JK		 1691 ext4_msg(sb, KERN_ERR,
1692 "Cannot set journaled quota options "
1693 "when QUOTA feature is enabled");
1694 return -1;
1695 }
5f3633e3 1696 sbi->s_jquota_fmt = m->mount_opt;
923ae0ff 1697#endif
923ae0ff 1698 } else if (token == Opt_dax) {
ef83b6e8
DW		 1699#ifdef CONFIG_FS_DAX
1700 ext4_msg(sb, KERN_WARNING,
1701 "DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
1702 sbi->s_mount_opt |= m->mount_opt;
1703#else
923ae0ff
RZ		 1704 ext4_msg(sb, KERN_INFO, "dax option not supported");
1705 return -1;
5f3633e3
JK		 1706#endif
1707 } else {
1708 if (!args->from)
1709 arg = 1;
1710 if (m->flags & MOPT_CLEAR)
1711 arg = !arg;
1712 else if (unlikely(!(m->flags & MOPT_SET))) {
1713 ext4_msg(sb, KERN_WARNING,
1714 "buggy handling of option %s", opt);
1715 WARN_ON(1);
1716 return -1;
1717 }
1718 if (arg != 0)
1719 sbi->s_mount_opt |= m->mount_opt;
1720 else
1721 sbi->s_mount_opt &= ~m->mount_opt;
26092bf5 1722 }
5f3633e3 1723 return 1;
26092bf5
TT		 1724}
1725
1726static int parse_options(char *options, struct super_block *sb,
1727 unsigned long *journal_devnum,
1728 unsigned int *journal_ioprio,
1729 int is_remount)
1730{
1731 struct ext4_sb_info *sbi = EXT4_SB(sb);
1732 char *p;
1733 substring_t args[MAX_OPT_ARGS];
1734 int token;
1735
1736 if (!options)
1737 return 1;
1738
1739 while ((p = strsep(&options, ",")) != NULL) {
1740 if (!*p)
1741 continue;
1742 /*
1743 * Initialize args struct so we know whether arg was
1744 * found; some options take optional arguments.
1745 */
caecd0af 1746 args[0].to = args[0].from = NULL;
26092bf5
TT		 1747 token = match_token(p, tokens, args);
1748 if (handle_mount_opt(sb, p, token, args, journal_devnum,
1749 journal_ioprio, is_remount) < 0)
1750 return 0;
ac27a0ec
DK		 1751 }
1752#ifdef CONFIG_QUOTA
e2b911c5 1753 if (ext4_has_feature_quota(sb) &&
262b4662
JK		 1754 (test_opt(sb, USRQUOTA) || test_opt(sb, GRPQUOTA))) {
1755 ext4_msg(sb, KERN_ERR, "Cannot set quota options when QUOTA "
1756 "feature is enabled");
1757 return 0;
1758 }
ac27a0ec 1759 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
482a7425 1760 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
fd8c37ec 1761 clear_opt(sb, USRQUOTA);
ac27a0ec 1762
482a7425 1763 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
fd8c37ec 1764 clear_opt(sb, GRPQUOTA);
ac27a0ec 1765
56c50f11 1766 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
b31e1552
ES		 1767 ext4_msg(sb, KERN_ERR, "old and new quota "
1768 "format mixing");
ac27a0ec
DK		 1769 return 0;
1770 }
1771
1772 if (!sbi->s_jquota_fmt) {
b31e1552
ES		 1773 ext4_msg(sb, KERN_ERR, "journaled quota format "
1774 "not specified");
ac27a0ec
DK		 1775 return 0;
1776 }
ac27a0ec
DK		 1777 }
1778#endif
261cb20c
JK		 1779 if (test_opt(sb, DIOREAD_NOLOCK)) {
1780 int blocksize =
1781 BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);
1782
1783 if (blocksize < PAGE_CACHE_SIZE) {
1784 ext4_msg(sb, KERN_ERR, "can't mount with "
1785 "dioread_nolock if block size != PAGE_SIZE");
1786 return 0;
1787 }
1788 }
d4f76107
JK		 1789 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA &&
1790 test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
1791 ext4_msg(sb, KERN_ERR, "can't mount with journal_async_commit "
1792 "in data=ordered mode");
1793 return 0;
1794 }
ac27a0ec
DK		 1795 return 1;
1796}
1797
2adf6da8
TT		 1798static inline void ext4_show_quota_options(struct seq_file *seq,
1799 struct super_block *sb)
1800{
1801#if defined(CONFIG_QUOTA)
1802 struct ext4_sb_info *sbi = EXT4_SB(sb);
1803
1804 if (sbi->s_jquota_fmt) {
1805 char *fmtname = "";
1806
1807 switch (sbi->s_jquota_fmt) {
1808 case QFMT_VFS_OLD:
1809 fmtname = "vfsold";
1810 break;
1811 case QFMT_VFS_V0:
1812 fmtname = "vfsv0";
1813 break;
1814 case QFMT_VFS_V1:
1815 fmtname = "vfsv1";
1816 break;
1817 }
1818 seq_printf(seq, ",jqfmt=%s", fmtname);
1819 }
1820
1821 if (sbi->s_qf_names[USRQUOTA])
a068acf2 1822 seq_show_option(seq, "usrjquota", sbi->s_qf_names[USRQUOTA]);
2adf6da8
TT		 1823
1824 if (sbi->s_qf_names[GRPQUOTA])
a068acf2 1825 seq_show_option(seq, "grpjquota", sbi->s_qf_names[GRPQUOTA]);
2adf6da8
TT		 1826#endif
1827}
1828
5a916be1
TT		 1829static const char *token2str(int token)
1830{
50df9fd5 1831 const struct match_token *t;
5a916be1
TT		 1832
1833 for (t = tokens; t->token != Opt_err; t++)
1834 if (t->token == token && !strchr(t->pattern, '='))
1835 break;
1836 return t->pattern;
1837}
1838
2adf6da8
TT		 1839/*
1840 * Show an option if
1841 * - it's set to a non-default value OR
1842 * - if the per-sb default is different from the global default
1843 */
66acdcf4
TT		 1844static int _ext4_show_options(struct seq_file *seq, struct super_block *sb,
1845 int nodefs)
2adf6da8 1846{
2adf6da8
TT		 1847 struct ext4_sb_info *sbi = EXT4_SB(sb);
1848 struct ext4_super_block *es = sbi->s_es;
66acdcf4 1849 int def_errors, def_mount_opt = nodefs ? 0 : sbi->s_def_mount_opt;
5a916be1 1850 const struct mount_opts *m;
66acdcf4 1851 char sep = nodefs ? '\n' : ',';
2adf6da8 1852
66acdcf4
TT		 1853#define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep)
1854#define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg)
2adf6da8
TT		 1855
1856 if (sbi->s_sb_block != 1)
5a916be1
TT		 1857 SEQ_OPTS_PRINT("sb=%llu", sbi->s_sb_block);
1858
1859 for (m = ext4_mount_opts; m->token != Opt_err; m++) {
1860 int want_set = m->flags & MOPT_SET;
1861 if (((m->flags & (MOPT_SET|MOPT_CLEAR)) == 0) ||
1862 (m->flags & MOPT_CLEAR_ERR))
1863 continue;
66acdcf4 1864 if (!(m->mount_opt & (sbi->s_mount_opt ^ def_mount_opt)))
5a916be1
TT		 1865 continue; /* skip if same as the default */
1866 if ((want_set &&
1867 (sbi->s_mount_opt & m->mount_opt) != m->mount_opt) ||
1868 (!want_set && (sbi->s_mount_opt & m->mount_opt)))
1869 continue; /* select Opt_noFoo vs Opt_Foo */
1870 SEQ_OPTS_PRINT("%s", token2str(m->token));
2adf6da8 1871 }
5a916be1 1872
08cefc7a 1873 if (nodefs || !uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT4_DEF_RESUID)) ||
5a916be1 1874 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID)
08cefc7a
EB		 1875 SEQ_OPTS_PRINT("resuid=%u",
1876 from_kuid_munged(&init_user_ns, sbi->s_resuid));
1877 if (nodefs || !gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT4_DEF_RESGID)) ||
5a916be1 1878 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID)
08cefc7a
EB		 1879 SEQ_OPTS_PRINT("resgid=%u",
1880 from_kgid_munged(&init_user_ns, sbi->s_resgid));
66acdcf4 1881 def_errors = nodefs ? -1 : le16_to_cpu(es->s_errors);
5a916be1
TT		 1882 if (test_opt(sb, ERRORS_RO) && def_errors != EXT4_ERRORS_RO)
1883 SEQ_OPTS_PUTS("errors=remount-ro");
2adf6da8 1884 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
5a916be1 1885 SEQ_OPTS_PUTS("errors=continue");
2adf6da8 1886 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
5a916be1 1887 SEQ_OPTS_PUTS("errors=panic");
66acdcf4 1888 if (nodefs || sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ)
5a916be1 1889 SEQ_OPTS_PRINT("commit=%lu", sbi->s_commit_interval / HZ);
66acdcf4 1890 if (nodefs || sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME)
5a916be1 1891 SEQ_OPTS_PRINT("min_batch_time=%u", sbi->s_min_batch_time);
66acdcf4 1892 if (nodefs || sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME)
5a916be1 1893 SEQ_OPTS_PRINT("max_batch_time=%u", sbi->s_max_batch_time);
2adf6da8 1894 if (sb->s_flags & MS_I_VERSION)
5a916be1 1895 SEQ_OPTS_PUTS("i_version");
66acdcf4 1896 if (nodefs || sbi->s_stripe)
5a916be1 1897 SEQ_OPTS_PRINT("stripe=%lu", sbi->s_stripe);
66acdcf4 1898 if (EXT4_MOUNT_DATA_FLAGS & (sbi->s_mount_opt ^ def_mount_opt)) {
5a916be1
TT		 1899 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
1900 SEQ_OPTS_PUTS("data=journal");
1901 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
1902 SEQ_OPTS_PUTS("data=ordered");
1903 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
1904 SEQ_OPTS_PUTS("data=writeback");
1905 }
66acdcf4
TT		 1906 if (nodefs ||
1907 sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
5a916be1
TT		 1908 SEQ_OPTS_PRINT("inode_readahead_blks=%u",
1909 sbi->s_inode_readahead_blks);
2adf6da8 1910
66acdcf4
TT		 1911 if (nodefs || (test_opt(sb, INIT_INODE_TABLE) &&
1912 (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT)))
5a916be1 1913 SEQ_OPTS_PRINT("init_itable=%u", sbi->s_li_wait_mult);
df981d03
TT		 1914 if (nodefs || sbi->s_max_dir_size_kb)
1915 SEQ_OPTS_PRINT("max_dir_size_kb=%u", sbi->s_max_dir_size_kb);
2adf6da8
TT		 1916
1917 ext4_show_quota_options(seq, sb);
2adf6da8
TT		 1918 return 0;
1919}
1920
66acdcf4
TT		 1921static int ext4_show_options(struct seq_file *seq, struct dentry *root)
1922{
1923 return _ext4_show_options(seq, root->d_sb, 0);
1924}
1925
ebd173be 1926int ext4_seq_options_show(struct seq_file *seq, void *offset)
66acdcf4
TT		 1927{
1928 struct super_block *sb = seq->private;
1929 int rc;
1930
1931 seq_puts(seq, (sb->s_flags & MS_RDONLY) ? "ro" : "rw");
1932 rc = _ext4_show_options(seq, sb, 1);
1933 seq_puts(seq, "\n");
1934 return rc;
1935}
1936
617ba13b 1937static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
ac27a0ec
DK		 1938 int read_only)
1939{
617ba13b 1940 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec
DK		 1941 int res = 0;
1942
617ba13b 1943 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
b31e1552
ES		 1944 ext4_msg(sb, KERN_ERR, "revision level too high, "
1945 "forcing read-only mode");
ac27a0ec
DK		 1946 res = MS_RDONLY;
1947 }
1948 if (read_only)
281b5995 1949 goto done;
617ba13b 1950 if (!(sbi->s_mount_state & EXT4_VALID_FS))
b31e1552
ES		 1951 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
1952 "running e2fsck is recommended");
c8b459f4 1953 else if (sbi->s_mount_state & EXT4_ERROR_FS)
b31e1552
ES		 1954 ext4_msg(sb, KERN_WARNING,
1955 "warning: mounting fs with errors, "
1956 "running e2fsck is recommended");
ed3ce80a 1957 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
ac27a0ec
DK		 1958 le16_to_cpu(es->s_mnt_count) >=
1959 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
b31e1552
ES		 1960 ext4_msg(sb, KERN_WARNING,
1961 "warning: maximal mount count reached, "
1962 "running e2fsck is recommended");
ac27a0ec
DK		 1963 else if (le32_to_cpu(es->s_checkinterval) &&
1964 (le32_to_cpu(es->s_lastcheck) +
1965 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
b31e1552
ES		 1966 ext4_msg(sb, KERN_WARNING,
1967 "warning: checktime reached, "
1968 "running e2fsck is recommended");
0b8e58a1 1969 if (!sbi->s_journal)
0390131b 1970 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
ac27a0ec 1971 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
617ba13b 1972 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
e8546d06 1973 le16_add_cpu(&es->s_mnt_count, 1);
ac27a0ec 1974 es->s_mtime = cpu_to_le32(get_seconds());
617ba13b 1975 ext4_update_dynamic_rev(sb);
0390131b 1976 if (sbi->s_journal)
e2b911c5 1977 ext4_set_feature_journal_needs_recovery(sb);
ac27a0ec 1978
e2d67052 1979 ext4_commit_super(sb, 1);
281b5995 1980done:
ac27a0ec 1981 if (test_opt(sb, DEBUG))
a9df9a49 1982 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
a2595b8a 1983 "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
ac27a0ec
DK		 1984 sb->s_blocksize,
1985 sbi->s_groups_count,
617ba13b
MC		 1986 EXT4_BLOCKS_PER_GROUP(sb),
1987 EXT4_INODES_PER_GROUP(sb),
a2595b8a 1988 sbi->s_mount_opt, sbi->s_mount_opt2);
ac27a0ec 1989
7abc52c2 1990 cleancache_init_fs(sb);
ac27a0ec
DK		 1991 return res;
1992}
1993
117fff10
TT		 1994int ext4_alloc_flex_bg_array(struct super_block *sb, ext4_group_t ngroup)
1995{
1996 struct ext4_sb_info *sbi = EXT4_SB(sb);
1997 struct flex_groups *new_groups;
1998 int size;
1999
2000 if (!sbi->s_log_groups_per_flex)
2001 return 0;
2002
2003 size = ext4_flex_group(sbi, ngroup - 1) + 1;
2004 if (size <= sbi->s_flex_groups_allocated)
2005 return 0;
2006
2007 size = roundup_pow_of_two(size * sizeof(struct flex_groups));
2008 new_groups = ext4_kvzalloc(size, GFP_KERNEL);
2009 if (!new_groups) {
2010 ext4_msg(sb, KERN_ERR, "not enough memory for %d flex groups",
2011 size / (int) sizeof(struct flex_groups));
2012 return -ENOMEM;
2013 }
2014
2015 if (sbi->s_flex_groups) {
2016 memcpy(new_groups, sbi->s_flex_groups,
2017 (sbi->s_flex_groups_allocated *
2018 sizeof(struct flex_groups)));
b93b41d4 2019 kvfree(sbi->s_flex_groups);
117fff10
TT		 2020 }
2021 sbi->s_flex_groups = new_groups;
2022 sbi->s_flex_groups_allocated = size / sizeof(struct flex_groups);
2023 return 0;
2024}
2025
772cb7c8
JS		 2026static int ext4_fill_flex_info(struct super_block *sb)
2027{
2028 struct ext4_sb_info *sbi = EXT4_SB(sb);
2029 struct ext4_group_desc *gdp = NULL;
772cb7c8 2030 ext4_group_t flex_group;
117fff10 2031 int i, err;
772cb7c8 2032
503358ae 2033 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
d50f2ab6 2034 if (sbi->s_log_groups_per_flex < 1 || sbi->s_log_groups_per_flex > 31) {
772cb7c8
JS		 2035 sbi->s_log_groups_per_flex = 0;
2036 return 1;
2037 }
2038
117fff10
TT		 2039 err = ext4_alloc_flex_bg_array(sb, sbi->s_groups_count);
2040 if (err)
9933fc0a 2041 goto failed;
772cb7c8 2042
772cb7c8 2043 for (i = 0; i < sbi->s_groups_count; i++) {
88b6edd1 2044 gdp = ext4_get_group_desc(sb, i, NULL);
772cb7c8
JS		 2045
2046 flex_group = ext4_flex_group(sbi, i);
7ad9bb65
TT		 2047 atomic_add(ext4_free_inodes_count(sb, gdp),
2048 &sbi->s_flex_groups[flex_group].free_inodes);
90ba983f
TT		 2049 atomic64_add(ext4_free_group_clusters(sb, gdp),
2050 &sbi->s_flex_groups[flex_group].free_clusters);
7ad9bb65
TT		 2051 atomic_add(ext4_used_dirs_count(sb, gdp),
2052 &sbi->s_flex_groups[flex_group].used_dirs);
772cb7c8
JS		 2053 }
2054
2055 return 1;
2056failed:
2057 return 0;
2058}
2059
e2b911c5 2060static __le16 ext4_group_desc_csum(struct super_block *sb, __u32 block_group,
feb0ab32 2061 struct ext4_group_desc *gdp)
717d50e4 2062{
feb0ab32 2063 int offset;
717d50e4 2064 __u16 crc = 0;
feb0ab32 2065 __le32 le_group = cpu_to_le32(block_group);
e2b911c5 2066 struct ext4_sb_info *sbi = EXT4_SB(sb);
717d50e4 2067
9aa5d32b 2068 if (ext4_has_metadata_csum(sbi->s_sb)) {
feb0ab32 2069 /* Use new metadata_csum algorithm */
d6a77105 2070 __le16 save_csum;
feb0ab32
DW		 2071 __u32 csum32;
2072
d6a77105 2073 save_csum = gdp->bg_checksum;
feb0ab32
DW		 2074 gdp->bg_checksum = 0;
2075 csum32 = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&le_group,
2076 sizeof(le_group));
2077 csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp,
2078 sbi->s_desc_size);
d6a77105 2079 gdp->bg_checksum = save_csum;
feb0ab32
DW		 2080
2081 crc = csum32 & 0xFFFF;
2082 goto out;
717d50e4
AD		 2083 }
2084
feb0ab32 2085 /* old crc16 code */
e2b911c5 2086 if (!ext4_has_feature_gdt_csum(sb))
813d32f9
DW		 2087 return 0;
2088
feb0ab32
DW		 2089 offset = offsetof(struct ext4_group_desc, bg_checksum);
2090
2091 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
2092 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
2093 crc = crc16(crc, (__u8 *)gdp, offset);
2094 offset += sizeof(gdp->bg_checksum); /* skip checksum */
2095 /* for checksum of struct ext4_group_desc do the rest...*/
e2b911c5 2096 if (ext4_has_feature_64bit(sb) &&
feb0ab32
DW		 2097 offset < le16_to_cpu(sbi->s_es->s_desc_size))
2098 crc = crc16(crc, (__u8 *)gdp + offset,
2099 le16_to_cpu(sbi->s_es->s_desc_size) -
2100 offset);
2101
2102out:
717d50e4
AD		 2103 return cpu_to_le16(crc);
2104}
2105
feb0ab32 2106int ext4_group_desc_csum_verify(struct super_block *sb, __u32 block_group,
717d50e4
AD		 2107 struct ext4_group_desc *gdp)
2108{
feb0ab32 2109 if (ext4_has_group_desc_csum(sb) &&
e2b911c5 2110 (gdp->bg_checksum != ext4_group_desc_csum(sb, block_group, gdp)))
717d50e4
AD		 2111 return 0;
2112
2113 return 1;
2114}
2115
feb0ab32
DW		 2116void ext4_group_desc_csum_set(struct super_block *sb, __u32 block_group,
2117 struct ext4_group_desc *gdp)
2118{
2119 if (!ext4_has_group_desc_csum(sb))
2120 return;
e2b911c5 2121 gdp->bg_checksum = ext4_group_desc_csum(sb, block_group, gdp);
feb0ab32
DW		 2122}
2123
ac27a0ec 2124/* Called at mount-time, super-block is locked */
bfff6873
LC		 2125static int ext4_check_descriptors(struct super_block *sb,
2126 ext4_group_t *first_not_zeroed)
ac27a0ec 2127{
617ba13b
MC		 2128 struct ext4_sb_info *sbi = EXT4_SB(sb);
2129 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
2130 ext4_fsblk_t last_block;
bd81d8ee
LV		 2131 ext4_fsblk_t block_bitmap;
2132 ext4_fsblk_t inode_bitmap;
2133 ext4_fsblk_t inode_table;
ce421581 2134 int flexbg_flag = 0;
bfff6873 2135 ext4_group_t i, grp = sbi->s_groups_count;
ac27a0ec 2136
e2b911c5 2137 if (ext4_has_feature_flex_bg(sb))
ce421581
JS		 2138 flexbg_flag = 1;
2139
af5bc92d 2140 ext4_debug("Checking group descriptors");
ac27a0ec 2141
197cd65a
AM		 2142 for (i = 0; i < sbi->s_groups_count; i++) {
2143 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
2144
ce421581 2145 if (i == sbi->s_groups_count - 1 || flexbg_flag)
bd81d8ee 2146 last_block = ext4_blocks_count(sbi->s_es) - 1;
ac27a0ec
DK		 2147 else
2148 last_block = first_block +
617ba13b 2149 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
ac27a0ec 2150
bfff6873
LC		 2151 if ((grp == sbi->s_groups_count) &&
2152 !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2153 grp = i;
2154
8fadc143 2155 block_bitmap = ext4_block_bitmap(sb, gdp);
2b2d6d01 2156 if (block_bitmap < first_block || block_bitmap > last_block) {
b31e1552 2157 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2158 "Block bitmap for group %u not in group "
b31e1552 2159 "(block %llu)!", i, block_bitmap);
ac27a0ec
DK		 2160 return 0;
2161 }
8fadc143 2162 inode_bitmap = ext4_inode_bitmap(sb, gdp);
2b2d6d01 2163 if (inode_bitmap < first_block || inode_bitmap > last_block) {
b31e1552 2164 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2165 "Inode bitmap for group %u not in group "
b31e1552 2166 "(block %llu)!", i, inode_bitmap);
ac27a0ec
DK		 2167 return 0;
2168 }
8fadc143 2169 inode_table = ext4_inode_table(sb, gdp);
bd81d8ee 2170 if (inode_table < first_block ||
2b2d6d01 2171 inode_table + sbi->s_itb_per_group - 1 > last_block) {
b31e1552 2172 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2173 "Inode table for group %u not in group "
b31e1552 2174 "(block %llu)!", i, inode_table);
ac27a0ec
DK		 2175 return 0;
2176 }
955ce5f5 2177 ext4_lock_group(sb, i);
feb0ab32 2178 if (!ext4_group_desc_csum_verify(sb, i, gdp)) {
b31e1552
ES		 2179 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2180 "Checksum for group %u failed (%u!=%u)",
e2b911c5 2181 i, le16_to_cpu(ext4_group_desc_csum(sb, i,
b31e1552 2182 gdp)), le16_to_cpu(gdp->bg_checksum));
7ee1ec4c 2183 if (!(sb->s_flags & MS_RDONLY)) {
955ce5f5 2184 ext4_unlock_group(sb, i);
8a266467 2185 return 0;
7ee1ec4c 2186 }
717d50e4 2187 }
955ce5f5 2188 ext4_unlock_group(sb, i);
ce421581
JS		 2189 if (!flexbg_flag)
2190 first_block += EXT4_BLOCKS_PER_GROUP(sb);
ac27a0ec 2191 }
bfff6873
LC		 2192 if (NULL != first_not_zeroed)
2193 *first_not_zeroed = grp;
ac27a0ec
DK		 2194 return 1;
2195}
2196
617ba13b 2197/* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
ac27a0ec
DK		 2198 * the superblock) which were deleted from all directories, but held open by
2199 * a process at the time of a crash. We walk the list and try to delete these
2200 * inodes at recovery time (only with a read-write filesystem).
2201 *
2202 * In order to keep the orphan inode chain consistent during traversal (in
2203 * case of crash during recovery), we link each inode into the superblock
2204 * orphan list_head and handle it the same way as an inode deletion during
2205 * normal operation (which journals the operations for us).
2206 *
2207 * We only do an iget() and an iput() on each inode, which is very safe if we
2208 * accidentally point at an in-use or already deleted inode. The worst that
2209 * can happen in this case is that we get a "bit already cleared" message from
617ba13b 2210 * ext4_free_inode(). The only reason we would point at a wrong inode is if
ac27a0ec
DK		 2211 * e2fsck was run on this filesystem, and it must have already done the orphan
2212 * inode cleanup for us, so we can safely abort without any further action.
2213 */
2b2d6d01
TT		 2214static void ext4_orphan_cleanup(struct super_block *sb,
2215 struct ext4_super_block *es)
ac27a0ec
DK		 2216{
2217 unsigned int s_flags = sb->s_flags;
2218 int nr_orphans = 0, nr_truncates = 0;
2219#ifdef CONFIG_QUOTA
2220 int i;
2221#endif
2222 if (!es->s_last_orphan) {
2223 jbd_debug(4, "no orphan inodes to clean up\n");
2224 return;
2225 }
2226
a8f48a95 2227 if (bdev_read_only(sb->s_bdev)) {
b31e1552
ES		 2228 ext4_msg(sb, KERN_ERR, "write access "
2229 "unavailable, skipping orphan cleanup");
a8f48a95
ES		 2230 return;
2231 }
2232
d39195c3
AG		 2233 /* Check if feature set would not allow a r/w mount */
2234 if (!ext4_feature_set_ok(sb, 0)) {
2235 ext4_msg(sb, KERN_INFO, "Skipping orphan cleanup due to "
2236 "unknown ROCOMPAT features");
2237 return;
2238 }
2239
617ba13b 2240 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
c25f9bc6
ES		 2241 /* don't clear list on RO mount w/ errors */
2242 if (es->s_last_orphan && !(s_flags & MS_RDONLY)) {
84474976 2243 ext4_msg(sb, KERN_INFO, "Errors on filesystem, "
ac27a0ec 2244 "clearing orphan list.\n");
c25f9bc6
ES		 2245 es->s_last_orphan = 0;
2246 }
ac27a0ec
DK		 2247 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2248 return;
2249 }
2250
2251 if (s_flags & MS_RDONLY) {
b31e1552 2252 ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
ac27a0ec
DK		 2253 sb->s_flags &= ~MS_RDONLY;
2254 }
2255#ifdef CONFIG_QUOTA
2256 /* Needed for iput() to work correctly and not trash data */
2257 sb->s_flags |= MS_ACTIVE;
2258 /* Turn on quotas so that they are updated correctly */
a2d4a646 2259 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
617ba13b
MC		 2260 if (EXT4_SB(sb)->s_qf_names[i]) {
2261 int ret = ext4_quota_on_mount(sb, i);
ac27a0ec 2262 if (ret < 0)
b31e1552
ES		 2263 ext4_msg(sb, KERN_ERR,
2264 "Cannot turn on journaled "
2265 "quota: error %d", ret);
ac27a0ec
DK		 2266 }
2267 }
2268#endif
2269
2270 while (es->s_last_orphan) {
2271 struct inode *inode;
2272
97bd42b9
JB		 2273 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
2274 if (IS_ERR(inode)) {
ac27a0ec
DK		 2275 es->s_last_orphan = 0;
2276 break;
2277 }
2278
617ba13b 2279 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
871a2931 2280 dquot_initialize(inode);
ac27a0ec 2281 if (inode->i_nlink) {
566370a2
PT		 2282 if (test_opt(sb, DEBUG))
2283 ext4_msg(sb, KERN_DEBUG,
2284 "%s: truncating inode %lu to %lld bytes",
2285 __func__, inode->i_ino, inode->i_size);
e5f8eab8 2286 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
ac27a0ec 2287 inode->i_ino, inode->i_size);
721e3eba 2288 mutex_lock(&inode->i_mutex);
55f252c9 2289 truncate_inode_pages(inode->i_mapping, inode->i_size);
617ba13b 2290 ext4_truncate(inode);
721e3eba 2291 mutex_unlock(&inode->i_mutex);
ac27a0ec
DK		 2292 nr_truncates++;
2293 } else {
566370a2
PT		 2294 if (test_opt(sb, DEBUG))
2295 ext4_msg(sb, KERN_DEBUG,
2296 "%s: deleting unreferenced inode %lu",
2297 __func__, inode->i_ino);
ac27a0ec
DK		 2298 jbd_debug(2, "deleting unreferenced inode %lu\n",
2299 inode->i_ino);
2300 nr_orphans++;
2301 }
2302 iput(inode); /* The delete magic happens here! */
2303 }
2304
2b2d6d01 2305#define PLURAL(x) (x), ((x) == 1) ? "" : "s"
ac27a0ec
DK		 2306
2307 if (nr_orphans)
b31e1552
ES		 2308 ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
2309 PLURAL(nr_orphans));
ac27a0ec 2310 if (nr_truncates)
b31e1552
ES		 2311 ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
2312 PLURAL(nr_truncates));
ac27a0ec
DK		 2313#ifdef CONFIG_QUOTA
2314 /* Turn quotas off */
a2d4a646 2315 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
ac27a0ec 2316 if (sb_dqopt(sb)->files[i])
287a8095 2317 dquot_quota_off(sb, i);
ac27a0ec
DK		 2318 }
2319#endif
2320 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
2321}
0b8e58a1 2322
cd2291a4
ES		 2323/*
2324 * Maximal extent format file size.
2325 * Resulting logical blkno at s_maxbytes must fit in our on-disk
2326 * extent format containers, within a sector_t, and within i_blocks
2327 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
2328 * so that won't be a limiting factor.
2329 *
f17722f9
LC		 2330 * However there is other limiting factor. We do store extents in the form
2331 * of starting block and length, hence the resulting length of the extent
2332 * covering maximum file size must fit into on-disk format containers as
2333 * well. Given that length is always by 1 unit bigger than max unit (because
2334 * we count 0 as well) we have to lower the s_maxbytes by one fs block.
2335 *
cd2291a4
ES		 2336 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
2337 */
f287a1a5 2338static loff_t ext4_max_size(int blkbits, int has_huge_files)
cd2291a4
ES		 2339{
2340 loff_t res;
2341 loff_t upper_limit = MAX_LFS_FILESIZE;
2342
2343 /* small i_blocks in vfs inode? */
f287a1a5 2344 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
cd2291a4 2345 /*
90c699a9 2346 * CONFIG_LBDAF is not enabled implies the inode
cd2291a4
ES		 2347 * i_block represent total blocks in 512 bytes
2348 * 32 == size of vfs inode i_blocks * 8
2349 */
2350 upper_limit = (1LL << 32) - 1;
2351
2352 /* total blocks in file system block size */
2353 upper_limit >>= (blkbits - 9);
2354 upper_limit <<= blkbits;
2355 }
2356
f17722f9
LC		 2357 /*
2358 * 32-bit extent-start container, ee_block. We lower the maxbytes
2359 * by one fs block, so ee_len can cover the extent of maximum file
2360 * size
2361 */
2362 res = (1LL << 32) - 1;
cd2291a4 2363 res <<= blkbits;
cd2291a4
ES		 2364
2365 /* Sanity check against vm- & vfs- imposed limits */
2366 if (res > upper_limit)
2367 res = upper_limit;
2368
2369 return res;
2370}
ac27a0ec 2371
ac27a0ec 2372/*
cd2291a4 2373 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
0fc1b451
AK		 2374 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2375 * We need to be 1 filesystem block less than the 2^48 sector limit.
ac27a0ec 2376 */
f287a1a5 2377static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
ac27a0ec 2378{
617ba13b 2379 loff_t res = EXT4_NDIR_BLOCKS;
0fc1b451
AK		 2380 int meta_blocks;
2381 loff_t upper_limit;
0b8e58a1
AD		 2382 /* This is calculated to be the largest file size for a dense, block
2383 * mapped file such that the file's total number of 512-byte sectors,
2384 * including data and all indirect blocks, does not exceed (2^48 - 1).
2385 *
2386 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2387 * number of 512-byte sectors of the file.
0fc1b451
AK		 2388 */
2389
f287a1a5 2390 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
0fc1b451 2391 /*
90c699a9 2392 * !has_huge_files or CONFIG_LBDAF not enabled implies that
0b8e58a1
AD		 2393 * the inode i_block field represents total file blocks in
2394 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
0fc1b451
AK		 2395 */
2396 upper_limit = (1LL << 32) - 1;
2397
2398 /* total blocks in file system block size */
2399 upper_limit >>= (bits - 9);
2400
2401 } else {
8180a562
AK		 2402 /*
2403 * We use 48 bit ext4_inode i_blocks
2404 * With EXT4_HUGE_FILE_FL set the i_blocks
2405 * represent total number of blocks in
2406 * file system block size
2407 */
0fc1b451
AK		 2408 upper_limit = (1LL << 48) - 1;
2409
0fc1b451
AK		 2410 }
2411
2412 /* indirect blocks */
2413 meta_blocks = 1;
2414 /* double indirect blocks */
2415 meta_blocks += 1 + (1LL << (bits-2));
2416 /* tripple indirect blocks */
2417 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
2418
2419 upper_limit -= meta_blocks;
2420 upper_limit <<= bits;
ac27a0ec
DK		 2421
2422 res += 1LL << (bits-2);
2423 res += 1LL << (2*(bits-2));
2424 res += 1LL << (3*(bits-2));
2425 res <<= bits;
2426 if (res > upper_limit)
2427 res = upper_limit;
0fc1b451
AK		 2428
2429 if (res > MAX_LFS_FILESIZE)
2430 res = MAX_LFS_FILESIZE;
2431
ac27a0ec
DK		 2432 return res;
2433}
2434
617ba13b 2435static ext4_fsblk_t descriptor_loc(struct super_block *sb,
0b8e58a1 2436 ext4_fsblk_t logical_sb_block, int nr)
ac27a0ec 2437{
617ba13b 2438 struct ext4_sb_info *sbi = EXT4_SB(sb);
fd2d4291 2439 ext4_group_t bg, first_meta_bg;
ac27a0ec
DK		 2440 int has_super = 0;
2441
2442 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
2443
e2b911c5 2444 if (!ext4_has_feature_meta_bg(sb) || nr < first_meta_bg)
70bbb3e0 2445 return logical_sb_block + nr + 1;
ac27a0ec 2446 bg = sbi->s_desc_per_block * nr;
617ba13b 2447 if (ext4_bg_has_super(sb, bg))
ac27a0ec 2448 has_super = 1;
0b8e58a1 2449
bd63f6b0
DW		 2450 /*
2451 * If we have a meta_bg fs with 1k blocks, group 0's GDT is at
2452 * block 2, not 1. If s_first_data_block == 0 (bigalloc is enabled
2453 * on modern mke2fs or blksize > 1k on older mke2fs) then we must
2454 * compensate.
2455 */
2456 if (sb->s_blocksize == 1024 && nr == 0 &&
2457 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block) == 0)
2458 has_super++;
2459
617ba13b 2460 return (has_super + ext4_group_first_block_no(sb, bg));
ac27a0ec
DK		 2461}
2462
c9de560d
AT		 2463/**
2464 * ext4_get_stripe_size: Get the stripe size.
2465 * @sbi: In memory super block info
2466 *
2467 * If we have specified it via mount option, then
2468 * use the mount option value. If the value specified at mount time is
2469 * greater than the blocks per group use the super block value.
2470 * If the super block value is greater than blocks per group return 0.
2471 * Allocator needs it be less than blocks per group.
2472 *
2473 */
2474static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
2475{
2476 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
2477 unsigned long stripe_width =
2478 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
3eb08658 2479 int ret;
c9de560d
AT		 2480
2481 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
3eb08658
DE		 2482 ret = sbi->s_stripe;
2483 else if (stripe_width <= sbi->s_blocks_per_group)
2484 ret = stripe_width;
2485 else if (stride <= sbi->s_blocks_per_group)
2486 ret = stride;
2487 else
2488 ret = 0;
c9de560d 2489
3eb08658
DE		 2490 /*
2491 * If the stripe width is 1, this makes no sense and
2492 * we set it to 0 to turn off stripe handling code.
2493 */
2494 if (ret <= 1)
2495 ret = 0;
c9de560d 2496
3eb08658 2497 return ret;
c9de560d 2498}
ac27a0ec 2499
a13fb1a4
ES		 2500/*
2501 * Check whether this filesystem can be mounted based on
2502 * the features present and the RDONLY/RDWR mount requested.
2503 * Returns 1 if this filesystem can be mounted as requested,
2504 * 0 if it cannot be.
2505 */
2506static int ext4_feature_set_ok(struct super_block *sb, int readonly)
2507{
e2b911c5 2508 if (ext4_has_unknown_ext4_incompat_features(sb)) {
a13fb1a4
ES		 2509 ext4_msg(sb, KERN_ERR,
2510 "Couldn't mount because of "
2511 "unsupported optional features (%x)",
2512 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
2513 ~EXT4_FEATURE_INCOMPAT_SUPP));
2514 return 0;
2515 }
2516
2517 if (readonly)
2518 return 1;
2519
e2b911c5 2520 if (ext4_has_feature_readonly(sb)) {
2cb5cc8b
DW		 2521 ext4_msg(sb, KERN_INFO, "filesystem is read-only");
2522 sb->s_flags |= MS_RDONLY;
2523 return 1;
2524 }
2525
a13fb1a4 2526 /* Check that feature set is OK for a read-write mount */
e2b911c5 2527 if (ext4_has_unknown_ext4_ro_compat_features(sb)) {
a13fb1a4
ES		 2528 ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of "
2529 "unsupported optional features (%x)",
2530 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
2531 ~EXT4_FEATURE_RO_COMPAT_SUPP));
2532 return 0;
2533 }
2534 /*
2535 * Large file size enabled file system can only be mounted
2536 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
2537 */
e2b911c5 2538 if (ext4_has_feature_huge_file(sb)) {
a13fb1a4
ES		 2539 if (sizeof(blkcnt_t) < sizeof(u64)) {
2540 ext4_msg(sb, KERN_ERR, "Filesystem with huge files "
2541 "cannot be mounted RDWR without "
2542 "CONFIG_LBDAF");
2543 return 0;
2544 }
2545 }
e2b911c5 2546 if (ext4_has_feature_bigalloc(sb) && !ext4_has_feature_extents(sb)) {
bab08ab9
TT		 2547 ext4_msg(sb, KERN_ERR,
2548 "Can't support bigalloc feature without "
2549 "extents feature\n");
2550 return 0;
2551 }
7c319d32
AK		 2552
2553#ifndef CONFIG_QUOTA
e2b911c5 2554 if (ext4_has_feature_quota(sb) && !readonly) {
7c319d32
AK		 2555 ext4_msg(sb, KERN_ERR,
2556 "Filesystem with quota feature cannot be mounted RDWR "
2557 "without CONFIG_QUOTA");
2558 return 0;
2559 }
2560#endif /* CONFIG_QUOTA */
a13fb1a4
ES		 2561 return 1;
2562}
2563
66e61a9e
TT		 2564/*
2565 * This function is called once a day if we have errors logged
2566 * on the file system
2567 */
2568static void print_daily_error_info(unsigned long arg)
2569{
2570 struct super_block *sb = (struct super_block *) arg;
2571 struct ext4_sb_info *sbi;
2572 struct ext4_super_block *es;
2573
2574 sbi = EXT4_SB(sb);
2575 es = sbi->s_es;
2576
2577 if (es->s_error_count)
ae0f78de
TT		 2578 /* fsck newer than v1.41.13 is needed to clean this condition. */
2579 ext4_msg(sb, KERN_NOTICE, "error count since last fsck: %u",
66e61a9e
TT		 2580 le32_to_cpu(es->s_error_count));
2581 if (es->s_first_error_time) {
ae0f78de 2582 printk(KERN_NOTICE "EXT4-fs (%s): initial error at time %u: %.*s:%d",
66e61a9e
TT		 2583 sb->s_id, le32_to_cpu(es->s_first_error_time),
2584 (int) sizeof(es->s_first_error_func),
2585 es->s_first_error_func,
2586 le32_to_cpu(es->s_first_error_line));
2587 if (es->s_first_error_ino)
2588 printk(": inode %u",
2589 le32_to_cpu(es->s_first_error_ino));
2590 if (es->s_first_error_block)
2591 printk(": block %llu", (unsigned long long)
2592 le64_to_cpu(es->s_first_error_block));
2593 printk("\n");
2594 }
2595 if (es->s_last_error_time) {
ae0f78de 2596 printk(KERN_NOTICE "EXT4-fs (%s): last error at time %u: %.*s:%d",
66e61a9e
TT		 2597 sb->s_id, le32_to_cpu(es->s_last_error_time),
2598 (int) sizeof(es->s_last_error_func),
2599 es->s_last_error_func,
2600 le32_to_cpu(es->s_last_error_line));
2601 if (es->s_last_error_ino)
2602 printk(": inode %u",
2603 le32_to_cpu(es->s_last_error_ino));
2604 if (es->s_last_error_block)
2605 printk(": block %llu", (unsigned long long)
2606 le64_to_cpu(es->s_last_error_block));
2607 printk("\n");
2608 }
2609 mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ); /* Once a day */
2610}
2611
bfff6873
LC		 2612/* Find next suitable group and run ext4_init_inode_table */
2613static int ext4_run_li_request(struct ext4_li_request *elr)
2614{
2615 struct ext4_group_desc *gdp = NULL;
2616 ext4_group_t group, ngroups;
2617 struct super_block *sb;
2618 unsigned long timeout = 0;
2619 int ret = 0;
2620
2621 sb = elr->lr_super;
2622 ngroups = EXT4_SB(sb)->s_groups_count;
2623
8e8ad8a5 2624 sb_start_write(sb);
bfff6873
LC		 2625 for (group = elr->lr_next_group; group < ngroups; group++) {
2626 gdp = ext4_get_group_desc(sb, group, NULL);
2627 if (!gdp) {
2628 ret = 1;
2629 break;
2630 }
2631
2632 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2633 break;
2634 }
2635
7f511862 2636 if (group >= ngroups)
bfff6873
LC		 2637 ret = 1;
2638
2639 if (!ret) {
2640 timeout = jiffies;
2641 ret = ext4_init_inode_table(sb, group,
2642 elr->lr_timeout ? 0 : 1);
2643 if (elr->lr_timeout == 0) {
51ce6511
LC		 2644 timeout = (jiffies - timeout) *
2645 elr->lr_sbi->s_li_wait_mult;
bfff6873
LC		 2646 elr->lr_timeout = timeout;
2647 }
2648 elr->lr_next_sched = jiffies + elr->lr_timeout;
2649 elr->lr_next_group = group + 1;
2650 }
8e8ad8a5 2651 sb_end_write(sb);
bfff6873
LC		 2652
2653 return ret;
2654}
2655
2656/*
2657 * Remove lr_request from the list_request and free the
4ed5c033 2658 * request structure. Should be called with li_list_mtx held
bfff6873
LC		 2659 */
2660static void ext4_remove_li_request(struct ext4_li_request *elr)
2661{
2662 struct ext4_sb_info *sbi;
2663
2664 if (!elr)
2665 return;
2666
2667 sbi = elr->lr_sbi;
2668
2669 list_del(&elr->lr_request);
2670 sbi->s_li_request = NULL;
2671 kfree(elr);
2672}
2673
2674static void ext4_unregister_li_request(struct super_block *sb)
2675{
1bb933fb
LC		 2676 mutex_lock(&ext4_li_mtx);
2677 if (!ext4_li_info) {
2678 mutex_unlock(&ext4_li_mtx);
bfff6873 2679 return;
1bb933fb 2680 }
bfff6873
LC		 2681
2682 mutex_lock(&ext4_li_info->li_list_mtx);
1bb933fb 2683 ext4_remove_li_request(EXT4_SB(sb)->s_li_request);
bfff6873 2684 mutex_unlock(&ext4_li_info->li_list_mtx);
1bb933fb 2685 mutex_unlock(&ext4_li_mtx);
bfff6873
LC		 2686}
2687
8f1f7453
ES		 2688static struct task_struct *ext4_lazyinit_task;
2689
bfff6873
LC		 2690/*
2691 * This is the function where ext4lazyinit thread lives. It walks
2692 * through the request list searching for next scheduled filesystem.
2693 * When such a fs is found, run the lazy initialization request
2694 * (ext4_rn_li_request) and keep track of the time spend in this
2695 * function. Based on that time we compute next schedule time of
2696 * the request. When walking through the list is complete, compute
2697 * next waking time and put itself into sleep.
2698 */
2699static int ext4_lazyinit_thread(void *arg)
2700{
2701 struct ext4_lazy_init *eli = (struct ext4_lazy_init *)arg;
2702 struct list_head *pos, *n;
2703 struct ext4_li_request *elr;
4ed5c033 2704 unsigned long next_wakeup, cur;
bfff6873
LC		 2705
2706 BUG_ON(NULL == eli);
2707
bfff6873
LC		 2708cont_thread:
2709 while (true) {
2710 next_wakeup = MAX_JIFFY_OFFSET;
2711
2712 mutex_lock(&eli->li_list_mtx);
2713 if (list_empty(&eli->li_request_list)) {
2714 mutex_unlock(&eli->li_list_mtx);
2715 goto exit_thread;
2716 }
2717
2718 list_for_each_safe(pos, n, &eli->li_request_list) {
2719 elr = list_entry(pos, struct ext4_li_request,
2720 lr_request);
2721
b2c78cd0
TT		 2722 if (time_after_eq(jiffies, elr->lr_next_sched)) {
2723 if (ext4_run_li_request(elr) != 0) {
2724 /* error, remove the lazy_init job */
2725 ext4_remove_li_request(elr);
2726 continue;
2727 }
bfff6873
LC		 2728 }
2729
2730 if (time_before(elr->lr_next_sched, next_wakeup))
2731 next_wakeup = elr->lr_next_sched;
2732 }
2733 mutex_unlock(&eli->li_list_mtx);
2734
a0acae0e 2735 try_to_freeze();
bfff6873 2736
4ed5c033
LC		 2737 cur = jiffies;
2738 if ((time_after_eq(cur, next_wakeup)) ||
f4245bd4 2739 (MAX_JIFFY_OFFSET == next_wakeup)) {
bfff6873
LC		 2740 cond_resched();
2741 continue;
2742 }
2743
4ed5c033
LC		 2744 schedule_timeout_interruptible(next_wakeup - cur);
2745
8f1f7453
ES		 2746 if (kthread_should_stop()) {
2747 ext4_clear_request_list();
2748 goto exit_thread;
2749 }
bfff6873
LC		 2750 }
2751
2752exit_thread:
2753 /*
2754 * It looks like the request list is empty, but we need
2755 * to check it under the li_list_mtx lock, to prevent any
2756 * additions into it, and of course we should lock ext4_li_mtx
2757 * to atomically free the list and ext4_li_info, because at
2758 * this point another ext4 filesystem could be registering
2759 * new one.
2760 */
2761 mutex_lock(&ext4_li_mtx);
2762 mutex_lock(&eli->li_list_mtx);
2763 if (!list_empty(&eli->li_request_list)) {
2764 mutex_unlock(&eli->li_list_mtx);
2765 mutex_unlock(&ext4_li_mtx);
2766 goto cont_thread;
2767 }
2768 mutex_unlock(&eli->li_list_mtx);
bfff6873
LC		 2769 kfree(ext4_li_info);
2770 ext4_li_info = NULL;
2771 mutex_unlock(&ext4_li_mtx);
2772
2773 return 0;
2774}
2775
2776static void ext4_clear_request_list(void)
2777{
2778 struct list_head *pos, *n;
2779 struct ext4_li_request *elr;
2780
2781 mutex_lock(&ext4_li_info->li_list_mtx);
bfff6873
LC		 2782 list_for_each_safe(pos, n, &ext4_li_info->li_request_list) {
2783 elr = list_entry(pos, struct ext4_li_request,
2784 lr_request);
2785 ext4_remove_li_request(elr);
2786 }
2787 mutex_unlock(&ext4_li_info->li_list_mtx);
2788}
2789
2790static int ext4_run_lazyinit_thread(void)
2791{
8f1f7453
ES		 2792 ext4_lazyinit_task = kthread_run(ext4_lazyinit_thread,
2793 ext4_li_info, "ext4lazyinit");
2794 if (IS_ERR(ext4_lazyinit_task)) {
2795 int err = PTR_ERR(ext4_lazyinit_task);
bfff6873 2796 ext4_clear_request_list();
bfff6873
LC		 2797 kfree(ext4_li_info);
2798 ext4_li_info = NULL;
92b97816 2799 printk(KERN_CRIT "EXT4-fs: error %d creating inode table "
bfff6873
LC		 2800 "initialization thread\n",
2801 err);
2802 return err;
2803 }
2804 ext4_li_info->li_state |= EXT4_LAZYINIT_RUNNING;
bfff6873
LC		 2805 return 0;
2806}
2807
2808/*
2809 * Check whether it make sense to run itable init. thread or not.
2810 * If there is at least one uninitialized inode table, return
2811 * corresponding group number, else the loop goes through all
2812 * groups and return total number of groups.
2813 */
2814static ext4_group_t ext4_has_uninit_itable(struct super_block *sb)
2815{
2816 ext4_group_t group, ngroups = EXT4_SB(sb)->s_groups_count;
2817 struct ext4_group_desc *gdp = NULL;
2818
2819 for (group = 0; group < ngroups; group++) {
2820 gdp = ext4_get_group_desc(sb, group, NULL);
2821 if (!gdp)
2822 continue;
2823
2824 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2825 break;
2826 }
2827
2828 return group;
2829}
2830
2831static int ext4_li_info_new(void)
2832{
2833 struct ext4_lazy_init *eli = NULL;
2834
2835 eli = kzalloc(sizeof(*eli), GFP_KERNEL);
2836 if (!eli)
2837 return -ENOMEM;
2838
bfff6873
LC		 2839 INIT_LIST_HEAD(&eli->li_request_list);
2840 mutex_init(&eli->li_list_mtx);
2841
bfff6873
LC		 2842 eli->li_state |= EXT4_LAZYINIT_QUIT;
2843
2844 ext4_li_info = eli;
2845
2846 return 0;
2847}
2848
2849static struct ext4_li_request *ext4_li_request_new(struct super_block *sb,
2850 ext4_group_t start)
2851{
2852 struct ext4_sb_info *sbi = EXT4_SB(sb);
2853 struct ext4_li_request *elr;
bfff6873
LC		 2854
2855 elr = kzalloc(sizeof(*elr), GFP_KERNEL);
2856 if (!elr)
2857 return NULL;
2858
2859 elr->lr_super = sb;
2860 elr->lr_sbi = sbi;
2861 elr->lr_next_group = start;
2862
2863 /*
2864 * Randomize first schedule time of the request to
2865 * spread the inode table initialization requests
2866 * better.
2867 */
dd1f723b
TT		 2868 elr->lr_next_sched = jiffies + (prandom_u32() %
2869 (EXT4_DEF_LI_MAX_START_DELAY * HZ));
bfff6873
LC		 2870 return elr;
2871}
2872
7f511862
TT		 2873int ext4_register_li_request(struct super_block *sb,
2874 ext4_group_t first_not_zeroed)
bfff6873
LC		 2875{
2876 struct ext4_sb_info *sbi = EXT4_SB(sb);
7f511862 2877 struct ext4_li_request *elr = NULL;
bfff6873 2878 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
6c5a6cb9 2879 int ret = 0;
bfff6873 2880
7f511862 2881 mutex_lock(&ext4_li_mtx);
51ce6511
LC		 2882 if (sbi->s_li_request != NULL) {
2883 /*
2884 * Reset timeout so it can be computed again, because
2885 * s_li_wait_mult might have changed.
2886 */
2887 sbi->s_li_request->lr_timeout = 0;
7f511862 2888 goto out;
51ce6511 2889 }
bfff6873
LC		 2890
2891 if (first_not_zeroed == ngroups ||
2892 (sb->s_flags & MS_RDONLY) ||
55ff3840 2893 !test_opt(sb, INIT_INODE_TABLE))
7f511862 2894 goto out;
bfff6873
LC		 2895
2896 elr = ext4_li_request_new(sb, first_not_zeroed);
7f511862
TT		 2897 if (!elr) {
2898 ret = -ENOMEM;
2899 goto out;
2900 }
bfff6873
LC		 2901
2902 if (NULL == ext4_li_info) {
2903 ret = ext4_li_info_new();
2904 if (ret)
2905 goto out;
2906 }
2907
2908 mutex_lock(&ext4_li_info->li_list_mtx);
2909 list_add(&elr->lr_request, &ext4_li_info->li_request_list);
2910 mutex_unlock(&ext4_li_info->li_list_mtx);
2911
2912 sbi->s_li_request = elr;
46e4690b
TM		 2913 /*
2914 * set elr to NULL here since it has been inserted to
2915 * the request_list and the removal and free of it is
2916 * handled by ext4_clear_request_list from now on.
2917 */
2918 elr = NULL;
bfff6873
LC		 2919
2920 if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) {
2921 ret = ext4_run_lazyinit_thread();
2922 if (ret)
2923 goto out;
2924 }
bfff6873 2925out:
beed5ecb
NK		 2926 mutex_unlock(&ext4_li_mtx);
2927 if (ret)
bfff6873 2928 kfree(elr);
bfff6873
LC		 2929 return ret;
2930}
2931
2932/*
2933 * We do not need to lock anything since this is called on
2934 * module unload.
2935 */
2936static void ext4_destroy_lazyinit_thread(void)
2937{
2938 /*
2939 * If thread exited earlier
2940 * there's nothing to be done.
2941 */
8f1f7453 2942 if (!ext4_li_info || !ext4_lazyinit_task)
bfff6873
LC		 2943 return;
2944
8f1f7453 2945 kthread_stop(ext4_lazyinit_task);
bfff6873
LC		 2946}
2947
25ed6e8a
DW		 2948static int set_journal_csum_feature_set(struct super_block *sb)
2949{
2950 int ret = 1;
2951 int compat, incompat;
2952 struct ext4_sb_info *sbi = EXT4_SB(sb);
2953
9aa5d32b 2954 if (ext4_has_metadata_csum(sb)) {
db9ee220 2955 /* journal checksum v3 */
25ed6e8a 2956 compat = 0;
db9ee220 2957 incompat = JBD2_FEATURE_INCOMPAT_CSUM_V3;
25ed6e8a
DW		 2958 } else {
2959 /* journal checksum v1 */
2960 compat = JBD2_FEATURE_COMPAT_CHECKSUM;
2961 incompat = 0;
2962 }
2963
feb8c6d3
DW		 2964 jbd2_journal_clear_features(sbi->s_journal,
2965 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
2966 JBD2_FEATURE_INCOMPAT_CSUM_V3 |
2967 JBD2_FEATURE_INCOMPAT_CSUM_V2);
25ed6e8a
DW		 2968 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
2969 ret = jbd2_journal_set_features(sbi->s_journal,
2970 compat, 0,
2971 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT |
2972 incompat);
2973 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
2974 ret = jbd2_journal_set_features(sbi->s_journal,
2975 compat, 0,
2976 incompat);
2977 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
2978 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2979 } else {
feb8c6d3
DW		 2980 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
2981 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
25ed6e8a
DW		 2982 }
2983
2984 return ret;
2985}
2986
952fc18e
TT		 2987/*
2988 * Note: calculating the overhead so we can be compatible with
2989 * historical BSD practice is quite difficult in the face of
2990 * clusters/bigalloc. This is because multiple metadata blocks from
2991 * different block group can end up in the same allocation cluster.
2992 * Calculating the exact overhead in the face of clustered allocation
2993 * requires either O(all block bitmaps) in memory or O(number of block
2994 * groups**2) in time. We will still calculate the superblock for
2995 * older file systems --- and if we come across with a bigalloc file
2996 * system with zero in s_overhead_clusters the estimate will be close to
2997 * correct especially for very large cluster sizes --- but for newer
2998 * file systems, it's better to calculate this figure once at mkfs
2999 * time, and store it in the superblock. If the superblock value is
3000 * present (even for non-bigalloc file systems), we will use it.
3001 */
3002static int count_overhead(struct super_block *sb, ext4_group_t grp,
3003 char *buf)
3004{
3005 struct ext4_sb_info *sbi = EXT4_SB(sb);
3006 struct ext4_group_desc *gdp;
3007 ext4_fsblk_t first_block, last_block, b;
3008 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3009 int s, j, count = 0;
3010
e2b911c5 3011 if (!ext4_has_feature_bigalloc(sb))
0548bbb8
TT		 3012 return (ext4_bg_has_super(sb, grp) + ext4_bg_num_gdb(sb, grp) +
3013 sbi->s_itb_per_group + 2);
3014
952fc18e
TT		 3015 first_block = le32_to_cpu(sbi->s_es->s_first_data_block) +
3016 (grp * EXT4_BLOCKS_PER_GROUP(sb));
3017 last_block = first_block + EXT4_BLOCKS_PER_GROUP(sb) - 1;
3018 for (i = 0; i < ngroups; i++) {
3019 gdp = ext4_get_group_desc(sb, i, NULL);
3020 b = ext4_block_bitmap(sb, gdp);
3021 if (b >= first_block && b <= last_block) {
3022 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3023 count++;
3024 }
3025 b = ext4_inode_bitmap(sb, gdp);
3026 if (b >= first_block && b <= last_block) {
3027 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3028 count++;
3029 }
3030 b = ext4_inode_table(sb, gdp);
3031 if (b >= first_block && b + sbi->s_itb_per_group <= last_block)
3032 for (j = 0; j < sbi->s_itb_per_group; j++, b++) {
3033 int c = EXT4_B2C(sbi, b - first_block);
3034 ext4_set_bit(c, buf);
3035 count++;
3036 }
3037 if (i != grp)
3038 continue;
3039 s = 0;
3040 if (ext4_bg_has_super(sb, grp)) {
3041 ext4_set_bit(s++, buf);
3042 count++;
3043 }
3044 for (j = ext4_bg_num_gdb(sb, grp); j > 0; j--) {
3045 ext4_set_bit(EXT4_B2C(sbi, s++), buf);
3046 count++;
3047 }
3048 }
3049 if (!count)
3050 return 0;
3051 return EXT4_CLUSTERS_PER_GROUP(sb) -
3052 ext4_count_free(buf, EXT4_CLUSTERS_PER_GROUP(sb) / 8);
3053}
3054
3055/*
3056 * Compute the overhead and stash it in sbi->s_overhead
3057 */
3058int ext4_calculate_overhead(struct super_block *sb)
3059{
3060 struct ext4_sb_info *sbi = EXT4_SB(sb);
3061 struct ext4_super_block *es = sbi->s_es;
3062 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3063 ext4_fsblk_t overhead = 0;
4fdb5543 3064 char *buf = (char *) get_zeroed_page(GFP_NOFS);
952fc18e 3065
952fc18e
TT		 3066 if (!buf)
3067 return -ENOMEM;
3068
3069 /*
3070 * Compute the overhead (FS structures). This is constant
3071 * for a given filesystem unless the number of block groups
3072 * changes so we cache the previous value until it does.
3073 */
3074
3075 /*
3076 * All of the blocks before first_data_block are overhead
3077 */
3078 overhead = EXT4_B2C(sbi, le32_to_cpu(es->s_first_data_block));
3079
3080 /*
3081 * Add the overhead found in each block group
3082 */
3083 for (i = 0; i < ngroups; i++) {
3084 int blks;
3085
3086 blks = count_overhead(sb, i, buf);
3087 overhead += blks;
3088 if (blks)
3089 memset(buf, 0, PAGE_SIZE);
3090 cond_resched();
3091 }
b003b524
ES		 3092 /* Add the internal journal blocks as well */
3093 if (sbi->s_journal && !sbi->journal_bdev)
810da240 3094 overhead += EXT4_NUM_B2C(sbi, sbi->s_journal->j_maxlen);
0875a2b4 3095
952fc18e
TT		 3096 sbi->s_overhead = overhead;
3097 smp_wmb();
3098 free_page((unsigned long) buf);
3099 return 0;
3100}
3101
b5799018 3102static void ext4_set_resv_clusters(struct super_block *sb)
27dd4385
LC		 3103{
3104 ext4_fsblk_t resv_clusters;
b5799018 3105 struct ext4_sb_info *sbi = EXT4_SB(sb);
27dd4385 3106
30fac0f7
JK		 3107 /*
3108 * There's no need to reserve anything when we aren't using extents.
3109 * The space estimates are exact, there are no unwritten extents,
3110 * hole punching doesn't need new metadata... This is needed especially
3111 * to keep ext2/3 backward compatibility.
3112 */
e2b911c5 3113 if (!ext4_has_feature_extents(sb))
b5799018 3114 return;
27dd4385
LC		 3115 /*
3116 * By default we reserve 2% or 4096 clusters, whichever is smaller.
3117 * This should cover the situations where we can not afford to run
3118 * out of space like for example punch hole, or converting
556615dc 3119 * unwritten extents in delalloc path. In most cases such
27dd4385
LC		 3120 * allocation would require 1, or 2 blocks, higher numbers are
3121 * very rare.
3122 */
b5799018
TT		 3123 resv_clusters = (ext4_blocks_count(sbi->s_es) >>
3124 sbi->s_cluster_bits);
27dd4385
LC		 3125
3126 do_div(resv_clusters, 50);
3127 resv_clusters = min_t(ext4_fsblk_t, resv_clusters, 4096);
3128
b5799018 3129 atomic64_set(&sbi->s_resv_clusters, resv_clusters);
27dd4385
LC		 3130}
3131
2b2d6d01 3132static int ext4_fill_super(struct super_block *sb, void *data, int silent)
ac27a0ec 3133{
d4c402d9 3134 char *orig_data = kstrdup(data, GFP_KERNEL);
2b2d6d01 3135 struct buffer_head *bh;
617ba13b
MC		 3136 struct ext4_super_block *es = NULL;
3137 struct ext4_sb_info *sbi;
3138 ext4_fsblk_t block;
3139 ext4_fsblk_t sb_block = get_sb_block(&data);
70bbb3e0 3140 ext4_fsblk_t logical_sb_block;
ac27a0ec 3141 unsigned long offset = 0;
ac27a0ec
DK		 3142 unsigned long journal_devnum = 0;
3143 unsigned long def_mount_opts;
3144 struct inode *root;
0390131b 3145 const char *descr;
dcc7dae3 3146 int ret = -ENOMEM;
281b5995 3147 int blocksize, clustersize;
4ec11028
TT		 3148 unsigned int db_count;
3149 unsigned int i;
281b5995 3150 int needs_recovery, has_huge_files, has_bigalloc;
bd81d8ee 3151 __u64 blocks_count;
07aa2ea1 3152 int err = 0;
b3881f74 3153 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
bfff6873 3154 ext4_group_t first_not_zeroed;
ac27a0ec
DK		 3155
3156 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
3157 if (!sbi)
dcc7dae3 3158 goto out_free_orig;
705895b6
PE		 3159
3160 sbi->s_blockgroup_lock =
3161 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
3162 if (!sbi->s_blockgroup_lock) {
3163 kfree(sbi);
dcc7dae3 3164 goto out_free_orig;
705895b6 3165 }
ac27a0ec 3166 sb->s_fs_info = sbi;
2c0544b2 3167 sbi->s_sb = sb;
240799cd 3168 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
d9c9bef1 3169 sbi->s_sb_block = sb_block;
f613dfcb
TT		 3170 if (sb->s_bdev->bd_part)
3171 sbi->s_sectors_written_start =
3172 part_stat_read(sb->s_bdev->bd_part, sectors[1]);
ac27a0ec 3173
9f6200bb 3174 /* Cleanup superblock name */
ec3904dc 3175 strreplace(sb->s_id, '/', '!');
9f6200bb 3176
07aa2ea1 3177 /* -EINVAL is default */
dcc7dae3 3178 ret = -EINVAL;
617ba13b 3179 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
ac27a0ec 3180 if (!blocksize) {
b31e1552 3181 ext4_msg(sb, KERN_ERR, "unable to set blocksize");
ac27a0ec
DK		 3182 goto out_fail;
3183 }
3184
3185 /*
617ba13b 3186 * The ext4 superblock will not be buffer aligned for other than 1kB
ac27a0ec
DK		 3187 * block sizes. We need to calculate the offset from buffer start.
3188 */
617ba13b 3189 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
70bbb3e0
AM		 3190 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3191 offset = do_div(logical_sb_block, blocksize);
ac27a0ec 3192 } else {
70bbb3e0 3193 logical_sb_block = sb_block;
ac27a0ec
DK		 3194 }
3195
a8ac900b 3196 if (!(bh = sb_bread_unmovable(sb, logical_sb_block))) {
b31e1552 3197 ext4_msg(sb, KERN_ERR, "unable to read superblock");
ac27a0ec
DK		 3198 goto out_fail;
3199 }
3200 /*
3201 * Note: s_es must be initialized as soon as possible because
617ba13b 3202 * some ext4 macro-instructions depend on its value
ac27a0ec 3203 */
2716b802 3204 es = (struct ext4_super_block *) (bh->b_data + offset);
ac27a0ec
DK		 3205 sbi->s_es = es;
3206 sb->s_magic = le16_to_cpu(es->s_magic);
617ba13b
MC		 3207 if (sb->s_magic != EXT4_SUPER_MAGIC)
3208 goto cantfind_ext4;
afc32f7e 3209 sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
ac27a0ec 3210
feb0ab32 3211 /* Warn if metadata_csum and gdt_csum are both set. */
e2b911c5
DW		 3212 if (ext4_has_feature_metadata_csum(sb) &&
3213 ext4_has_feature_gdt_csum(sb))
363307e6 3214 ext4_warning(sb, "metadata_csum and uninit_bg are "
feb0ab32
DW		 3215 "redundant flags; please run fsck.");
3216
d25425f8
DW		 3217 /* Check for a known checksum algorithm */
3218 if (!ext4_verify_csum_type(sb, es)) {
3219 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3220 "unknown checksum algorithm.");
3221 silent = 1;
3222 goto cantfind_ext4;
3223 }
3224
0441984a 3225 /* Load the checksum driver */
e2b911c5 3226 if (ext4_has_feature_metadata_csum(sb)) {
0441984a
DW		 3227 sbi->s_chksum_driver = crypto_alloc_shash("crc32c", 0, 0);
3228 if (IS_ERR(sbi->s_chksum_driver)) {
3229 ext4_msg(sb, KERN_ERR, "Cannot load crc32c driver.");
3230 ret = PTR_ERR(sbi->s_chksum_driver);
3231 sbi->s_chksum_driver = NULL;
3232 goto failed_mount;
3233 }
3234 }
3235
a9c47317
DW		 3236 /* Check superblock checksum */
3237 if (!ext4_superblock_csum_verify(sb, es)) {
3238 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3239 "invalid superblock checksum. Run e2fsck?");
3240 silent = 1;
6a797d27 3241 ret = -EFSBADCRC;
a9c47317
DW		 3242 goto cantfind_ext4;
3243 }
3244
3245 /* Precompute checksum seed for all metadata */
e2b911c5 3246 if (ext4_has_feature_csum_seed(sb))
8c81bd8f
DW		 3247 sbi->s_csum_seed = le32_to_cpu(es->s_checksum_seed);
3248 else if (ext4_has_metadata_csum(sb))
a9c47317
DW		 3249 sbi->s_csum_seed = ext4_chksum(sbi, ~0, es->s_uuid,
3250 sizeof(es->s_uuid));
3251
ac27a0ec
DK		 3252 /* Set defaults before we parse the mount options */
3253 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
fd8c37ec 3254 set_opt(sb, INIT_INODE_TABLE);
617ba13b 3255 if (def_mount_opts & EXT4_DEFM_DEBUG)
fd8c37ec 3256 set_opt(sb, DEBUG);
87f26807 3257 if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
fd8c37ec 3258 set_opt(sb, GRPID);
617ba13b 3259 if (def_mount_opts & EXT4_DEFM_UID16)
fd8c37ec 3260 set_opt(sb, NO_UID32);
ea663336 3261 /* xattr user namespace & acls are now defaulted on */
ea663336 3262 set_opt(sb, XATTR_USER);
03010a33 3263#ifdef CONFIG_EXT4_FS_POSIX_ACL
ea663336 3264 set_opt(sb, POSIX_ACL);
2e7842b8 3265#endif
98c1a759
DW		 3266 /* don't forget to enable journal_csum when metadata_csum is enabled. */
3267 if (ext4_has_metadata_csum(sb))
3268 set_opt(sb, JOURNAL_CHECKSUM);
3269
617ba13b 3270 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
fd8c37ec 3271 set_opt(sb, JOURNAL_DATA);
617ba13b 3272 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
fd8c37ec 3273 set_opt(sb, ORDERED_DATA);
617ba13b 3274 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
fd8c37ec 3275 set_opt(sb, WRITEBACK_DATA);
617ba13b
MC		 3276
3277 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
fd8c37ec 3278 set_opt(sb, ERRORS_PANIC);
bb4f397a 3279 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
fd8c37ec 3280 set_opt(sb, ERRORS_CONT);
bb4f397a 3281 else
fd8c37ec 3282 set_opt(sb, ERRORS_RO);
45f1a9c3
DW		 3283 /* block_validity enabled by default; disable with noblock_validity */
3284 set_opt(sb, BLOCK_VALIDITY);
8b67f04a 3285 if (def_mount_opts & EXT4_DEFM_DISCARD)
fd8c37ec 3286 set_opt(sb, DISCARD);
ac27a0ec 3287
08cefc7a
EB		 3288 sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));
3289 sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid));
30773840
TT		 3290 sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
3291 sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
3292 sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
ac27a0ec 3293
8b67f04a 3294 if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0)
fd8c37ec 3295 set_opt(sb, BARRIER);
ac27a0ec 3296
dd919b98
AK		 3297 /*
3298 * enable delayed allocation by default
3299 * Use -o nodelalloc to turn it off
3300 */
bc0b75f7 3301 if (!IS_EXT3_SB(sb) && !IS_EXT2_SB(sb) &&
8b67f04a 3302 ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0))
fd8c37ec 3303 set_opt(sb, DELALLOC);
dd919b98 3304
51ce6511
LC		 3305 /*
3306 * set default s_li_wait_mult for lazyinit, for the case there is
3307 * no mount option specified.
3308 */
3309 sbi->s_li_wait_mult = EXT4_DEF_LI_WAIT_MULT;
3310
8b67f04a 3311 if (!parse_options((char *) sbi->s_es->s_mount_opts, sb,
661aa520 3312 &journal_devnum, &journal_ioprio, 0)) {
8b67f04a
TT		 3313 ext4_msg(sb, KERN_WARNING,
3314 "failed to parse options in superblock: %s",
3315 sbi->s_es->s_mount_opts);
3316 }
5a916be1 3317 sbi->s_def_mount_opt = sbi->s_mount_opt;
b3881f74 3318 if (!parse_options((char *) data, sb, &journal_devnum,
661aa520 3319 &journal_ioprio, 0))
ac27a0ec
DK		 3320 goto failed_mount;
3321
56889787
TT		 3322 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
3323 printk_once(KERN_WARNING "EXT4-fs: Warning: mounting "
3324 "with data=journal disables delayed "
3325 "allocation and O_DIRECT support!\n");
3326 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
3327 ext4_msg(sb, KERN_ERR, "can't mount with "
3328 "both data=journal and delalloc");
3329 goto failed_mount;
3330 }
3331 if (test_opt(sb, DIOREAD_NOLOCK)) {
3332 ext4_msg(sb, KERN_ERR, "can't mount with "
6ae6514b 3333 "both data=journal and dioread_nolock");
56889787
TT		 3334 goto failed_mount;
3335 }
923ae0ff
RZ		 3336 if (test_opt(sb, DAX)) {
3337 ext4_msg(sb, KERN_ERR, "can't mount with "
3338 "both data=journal and dax");
3339 goto failed_mount;
3340 }
56889787
TT		 3341 if (test_opt(sb, DELALLOC))
3342 clear_opt(sb, DELALLOC);
001e4a87
TH		 3343 } else {
3344 sb->s_iflags |= SB_I_CGROUPWB;
56889787
TT		 3345 }
3346
ac27a0ec 3347 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
482a7425 3348 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec 3349
617ba13b 3350 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
e2b911c5
DW		 3351 (ext4_has_compat_features(sb) ||
3352 ext4_has_ro_compat_features(sb) ||
3353 ext4_has_incompat_features(sb)))
b31e1552
ES		 3354 ext4_msg(sb, KERN_WARNING,
3355 "feature flags set on rev 0 fs, "
3356 "running e2fsck is recommended");
469108ff 3357
ed3654eb
TT		 3358 if (es->s_creator_os == cpu_to_le32(EXT4_OS_HURD)) {
3359 set_opt2(sb, HURD_COMPAT);
e2b911c5 3360 if (ext4_has_feature_64bit(sb)) {
ed3654eb
TT		 3361 ext4_msg(sb, KERN_ERR,
3362 "The Hurd can't support 64-bit file systems");
3363 goto failed_mount;
3364 }
3365 }
3366
2035e776
TT		 3367 if (IS_EXT2_SB(sb)) {
3368 if (ext2_feature_set_ok(sb))
3369 ext4_msg(sb, KERN_INFO, "mounting ext2 file system "
3370 "using the ext4 subsystem");
3371 else {
3372 ext4_msg(sb, KERN_ERR, "couldn't mount as ext2 due "
3373 "to feature incompatibilities");
3374 goto failed_mount;
3375 }
3376 }
3377
3378 if (IS_EXT3_SB(sb)) {
3379 if (ext3_feature_set_ok(sb))
3380 ext4_msg(sb, KERN_INFO, "mounting ext3 file system "
3381 "using the ext4 subsystem");
3382 else {
3383 ext4_msg(sb, KERN_ERR, "couldn't mount as ext3 due "
3384 "to feature incompatibilities");
3385 goto failed_mount;
3386 }
3387 }
3388
ac27a0ec
DK		 3389 /*
3390 * Check feature flags regardless of the revision level, since we
3391 * previously didn't change the revision level when setting the flags,
3392 * so there is a chance incompat flags are set on a rev 0 filesystem.
3393 */
a13fb1a4 3394 if (!ext4_feature_set_ok(sb, (sb->s_flags & MS_RDONLY)))
ac27a0ec 3395 goto failed_mount;
a13fb1a4 3396
261cb20c 3397 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
617ba13b
MC		 3398 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
3399 blocksize > EXT4_MAX_BLOCK_SIZE) {
b31e1552
ES		 3400 ext4_msg(sb, KERN_ERR,
3401 "Unsupported filesystem blocksize %d", blocksize);
ac27a0ec
DK		 3402 goto failed_mount;
3403 }
3404
923ae0ff
RZ		 3405 if (sbi->s_mount_opt & EXT4_MOUNT_DAX) {
3406 if (blocksize != PAGE_SIZE) {
3407 ext4_msg(sb, KERN_ERR,
3408 "error: unsupported blocksize for dax");
3409 goto failed_mount;
3410 }
3411 if (!sb->s_bdev->bd_disk->fops->direct_access) {
3412 ext4_msg(sb, KERN_ERR,
3413 "error: device does not support dax");
3414 goto failed_mount;
3415 }
3416 }
3417
e2b911c5 3418 if (ext4_has_feature_encrypt(sb) && es->s_encryption_level) {
6ddb2447
TT		 3419 ext4_msg(sb, KERN_ERR, "Unsupported encryption level %d",
3420 es->s_encryption_level);
3421 goto failed_mount;
3422 }
3423
ac27a0ec 3424 if (sb->s_blocksize != blocksize) {
ce40733c
AK		 3425 /* Validate the filesystem blocksize */
3426 if (!sb_set_blocksize(sb, blocksize)) {
b31e1552 3427 ext4_msg(sb, KERN_ERR, "bad block size %d",
ce40733c 3428 blocksize);
ac27a0ec
DK		 3429 goto failed_mount;
3430 }
3431
2b2d6d01 3432 brelse(bh);
70bbb3e0
AM		 3433 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3434 offset = do_div(logical_sb_block, blocksize);
a8ac900b 3435 bh = sb_bread_unmovable(sb, logical_sb_block);
ac27a0ec 3436 if (!bh) {
b31e1552
ES		 3437 ext4_msg(sb, KERN_ERR,
3438 "Can't read superblock on 2nd try");
ac27a0ec
DK		 3439 goto failed_mount;
3440 }
2716b802 3441 es = (struct ext4_super_block *)(bh->b_data + offset);
ac27a0ec 3442 sbi->s_es = es;
617ba13b 3443 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
b31e1552
ES		 3444 ext4_msg(sb, KERN_ERR,
3445 "Magic mismatch, very weird!");
ac27a0ec
DK		 3446 goto failed_mount;
3447 }
3448 }
3449
e2b911c5 3450 has_huge_files = ext4_has_feature_huge_file(sb);
f287a1a5
TT		 3451 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
3452 has_huge_files);
3453 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
ac27a0ec 3454
617ba13b
MC		 3455 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
3456 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
3457 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
ac27a0ec
DK		 3458 } else {
3459 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
3460 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
617ba13b 3461 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
1330593e 3462 (!is_power_of_2(sbi->s_inode_size)) ||
ac27a0ec 3463 (sbi->s_inode_size > blocksize)) {
b31e1552
ES		 3464 ext4_msg(sb, KERN_ERR,
3465 "unsupported inode size: %d",
2b2d6d01 3466 sbi->s_inode_size);
ac27a0ec
DK		 3467 goto failed_mount;
3468 }
ef7f3835
KS		 3469 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
3470 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
ac27a0ec 3471 }
0b8e58a1 3472
0d1ee42f 3473 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
e2b911c5 3474 if (ext4_has_feature_64bit(sb)) {
8fadc143 3475 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
0d1ee42f 3476 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
d8ea6cf8 3477 !is_power_of_2(sbi->s_desc_size)) {
b31e1552
ES		 3478 ext4_msg(sb, KERN_ERR,
3479 "unsupported descriptor size %lu",
0d1ee42f
AR		 3480 sbi->s_desc_size);
3481 goto failed_mount;
3482 }
3483 } else
3484 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
0b8e58a1 3485
ac27a0ec 3486 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
ac27a0ec 3487 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
b47b6f38 3488 if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
617ba13b 3489 goto cantfind_ext4;
0b8e58a1 3490
617ba13b 3491 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
ac27a0ec 3492 if (sbi->s_inodes_per_block == 0)
617ba13b 3493 goto cantfind_ext4;
ac27a0ec
DK		 3494 sbi->s_itb_per_group = sbi->s_inodes_per_group /
3495 sbi->s_inodes_per_block;
0d1ee42f 3496 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
ac27a0ec
DK		 3497 sbi->s_sbh = bh;
3498 sbi->s_mount_state = le16_to_cpu(es->s_state);
e57aa839
FW		 3499 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
3500 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
0b8e58a1 3501
2b2d6d01 3502 for (i = 0; i < 4; i++)
ac27a0ec
DK		 3503 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
3504 sbi->s_def_hash_version = es->s_def_hash_version;
e2b911c5 3505 if (ext4_has_feature_dir_index(sb)) {
23301410
TT		 3506 i = le32_to_cpu(es->s_flags);
3507 if (i & EXT2_FLAGS_UNSIGNED_HASH)
3508 sbi->s_hash_unsigned = 3;
3509 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
f99b2589 3510#ifdef __CHAR_UNSIGNED__
23301410
TT		 3511 if (!(sb->s_flags & MS_RDONLY))
3512 es->s_flags |=
3513 cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
3514 sbi->s_hash_unsigned = 3;
f99b2589 3515#else
23301410
TT		 3516 if (!(sb->s_flags & MS_RDONLY))
3517 es->s_flags |=
3518 cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
f99b2589 3519#endif
23301410 3520 }
f99b2589 3521 }
ac27a0ec 3522
281b5995
TT		 3523 /* Handle clustersize */
3524 clustersize = BLOCK_SIZE << le32_to_cpu(es->s_log_cluster_size);
e2b911c5 3525 has_bigalloc = ext4_has_feature_bigalloc(sb);
281b5995
TT		 3526 if (has_bigalloc) {
3527 if (clustersize < blocksize) {
3528 ext4_msg(sb, KERN_ERR,
3529 "cluster size (%d) smaller than "
3530 "block size (%d)", clustersize, blocksize);
3531 goto failed_mount;
3532 }
3533 sbi->s_cluster_bits = le32_to_cpu(es->s_log_cluster_size) -
3534 le32_to_cpu(es->s_log_block_size);
3535 sbi->s_clusters_per_group =
3536 le32_to_cpu(es->s_clusters_per_group);
3537 if (sbi->s_clusters_per_group > blocksize * 8) {
3538 ext4_msg(sb, KERN_ERR,
3539 "#clusters per group too big: %lu",
3540 sbi->s_clusters_per_group);
3541 goto failed_mount;
3542 }
3543 if (sbi->s_blocks_per_group !=
3544 (sbi->s_clusters_per_group * (clustersize / blocksize))) {
3545 ext4_msg(sb, KERN_ERR, "blocks per group (%lu) and "
3546 "clusters per group (%lu) inconsistent",
3547 sbi->s_blocks_per_group,
3548 sbi->s_clusters_per_group);
3549 goto failed_mount;
3550 }
3551 } else {
3552 if (clustersize != blocksize) {
3553 ext4_warning(sb, "fragment/cluster size (%d) != "
3554 "block size (%d)", clustersize,
3555 blocksize);
3556 clustersize = blocksize;
3557 }
3558 if (sbi->s_blocks_per_group > blocksize * 8) {
3559 ext4_msg(sb, KERN_ERR,
3560 "#blocks per group too big: %lu",
3561 sbi->s_blocks_per_group);
3562 goto failed_mount;
3563 }
3564 sbi->s_clusters_per_group = sbi->s_blocks_per_group;
3565 sbi->s_cluster_bits = 0;
ac27a0ec 3566 }
281b5995
TT		 3567 sbi->s_cluster_ratio = clustersize / blocksize;
3568
ac27a0ec 3569 if (sbi->s_inodes_per_group > blocksize * 8) {
b31e1552
ES		 3570 ext4_msg(sb, KERN_ERR,
3571 "#inodes per group too big: %lu",
2b2d6d01 3572 sbi->s_inodes_per_group);
ac27a0ec
DK		 3573 goto failed_mount;
3574 }
3575
960fd856
TT		 3576 /* Do we have standard group size of clustersize * 8 blocks ? */
3577 if (sbi->s_blocks_per_group == clustersize << 3)
3578 set_opt2(sb, STD_GROUP_SIZE);
3579
bf43d84b
ES		 3580 /*
3581 * Test whether we have more sectors than will fit in sector_t,
3582 * and whether the max offset is addressable by the page cache.
3583 */
5a9ae68a 3584 err = generic_check_addressable(sb->s_blocksize_bits,
30ca22c7 3585 ext4_blocks_count(es));
5a9ae68a 3586 if (err) {
b31e1552 3587 ext4_msg(sb, KERN_ERR, "filesystem"
bf43d84b 3588 " too large to mount safely on this system");
ac27a0ec 3589 if (sizeof(sector_t) < 8)
90c699a9 3590 ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled");
ac27a0ec
DK		 3591 goto failed_mount;
3592 }
3593
617ba13b
MC		 3594 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
3595 goto cantfind_ext4;
e7c95593 3596
0f2ddca6
FTN		 3597 /* check blocks count against device size */
3598 blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
3599 if (blocks_count && ext4_blocks_count(es) > blocks_count) {
b31e1552
ES		 3600 ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
3601 "exceeds size of device (%llu blocks)",
0f2ddca6
FTN		 3602 ext4_blocks_count(es), blocks_count);
3603 goto failed_mount;
3604 }
3605
0b8e58a1
AD		 3606 /*
3607 * It makes no sense for the first data block to be beyond the end
3608 * of the filesystem.
3609 */
3610 if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
5635a62b 3611 ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
b31e1552
ES		 3612 "block %u is beyond end of filesystem (%llu)",
3613 le32_to_cpu(es->s_first_data_block),
3614 ext4_blocks_count(es));
e7c95593
ES		 3615 goto failed_mount;
3616 }
bd81d8ee
LV		 3617 blocks_count = (ext4_blocks_count(es) -
3618 le32_to_cpu(es->s_first_data_block) +
3619 EXT4_BLOCKS_PER_GROUP(sb) - 1);
3620 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
4ec11028 3621 if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
b31e1552 3622 ext4_msg(sb, KERN_WARNING, "groups count too large: %u "
4ec11028 3623 "(block count %llu, first data block %u, "
b31e1552 3624 "blocks per group %lu)", sbi->s_groups_count,
4ec11028
TT		 3625 ext4_blocks_count(es),
3626 le32_to_cpu(es->s_first_data_block),
3627 EXT4_BLOCKS_PER_GROUP(sb));
3628 goto failed_mount;
3629 }
bd81d8ee 3630 sbi->s_groups_count = blocks_count;
fb0a387d
ES		 3631 sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
3632 (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
617ba13b
MC		 3633 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
3634 EXT4_DESC_PER_BLOCK(sb);
f18a5f21
TT		 3635 sbi->s_group_desc = ext4_kvmalloc(db_count *
3636 sizeof(struct buffer_head *),
3637 GFP_KERNEL);
ac27a0ec 3638 if (sbi->s_group_desc == NULL) {
b31e1552 3639 ext4_msg(sb, KERN_ERR, "not enough memory");
2cde417d 3640 ret = -ENOMEM;
ac27a0ec
DK		 3641 goto failed_mount;
3642 }
3643
705895b6 3644 bgl_lock_init(sbi->s_blockgroup_lock);
ac27a0ec
DK		 3645
3646 for (i = 0; i < db_count; i++) {
70bbb3e0 3647 block = descriptor_loc(sb, logical_sb_block, i);
a8ac900b 3648 sbi->s_group_desc[i] = sb_bread_unmovable(sb, block);
ac27a0ec 3649 if (!sbi->s_group_desc[i]) {
b31e1552
ES		 3650 ext4_msg(sb, KERN_ERR,
3651 "can't read group descriptor %d", i);
ac27a0ec
DK		 3652 db_count = i;
3653 goto failed_mount2;
3654 }
3655 }
bfff6873 3656 if (!ext4_check_descriptors(sb, &first_not_zeroed)) {
b31e1552 3657 ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
6a797d27 3658 ret = -EFSCORRUPTED;
f9ae9cf5 3659 goto failed_mount2;
ac27a0ec 3660 }
772cb7c8 3661
f9ae9cf5 3662 sbi->s_gdb_count = db_count;
ac27a0ec
DK		 3663 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
3664 spin_lock_init(&sbi->s_next_gen_lock);
3665
04ecddb7
JM		 3666 setup_timer(&sbi->s_err_report, print_daily_error_info,
3667 (unsigned long) sb);
04496411 3668
a75ae78f 3669 /* Register extent status tree shrinker */
eb68d0e2 3670 if (ext4_es_register_shrinker(sbi))
ce7e010a 3671 goto failed_mount3;
ce7e010a 3672
c9de560d 3673 sbi->s_stripe = ext4_get_stripe_size(sbi);
67a5da56 3674 sbi->s_extent_max_zeroout_kb = 32;
c9de560d 3675
f9ae9cf5
TT		 3676 /*
3677 * set up enough so that it can read an inode
3678 */
f6e63f90 3679 sb->s_op = &ext4_sops;
617ba13b
MC		 3680 sb->s_export_op = &ext4_export_ops;
3681 sb->s_xattr = ext4_xattr_handlers;
ac27a0ec 3682#ifdef CONFIG_QUOTA
617ba13b 3683 sb->dq_op = &ext4_quota_operations;
e2b911c5 3684 if (ext4_has_feature_quota(sb))
1fa5efe3 3685 sb->s_qcop = &dquot_quotactl_sysfile_ops;
262b4662
JK		 3686 else
3687 sb->s_qcop = &ext4_qctl_operations;
96c7e0d9 3688 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
ac27a0ec 3689#endif
f2fa2ffc
AK		 3690 memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
3691
ac27a0ec 3692 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
3b9d4ed2 3693 mutex_init(&sbi->s_orphan_lock);
ac27a0ec
DK		 3694
3695 sb->s_root = NULL;
3696
3697 needs_recovery = (es->s_last_orphan != 0 ||
e2b911c5 3698 ext4_has_feature_journal_needs_recovery(sb));
ac27a0ec 3699
e2b911c5 3700 if (ext4_has_feature_mmp(sb) && !(sb->s_flags & MS_RDONLY))
c5e06d10 3701 if (ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block)))
50460fe8 3702 goto failed_mount3a;
c5e06d10 3703
ac27a0ec
DK		 3704 /*
3705 * The first inode we look at is the journal inode. Don't try
3706 * root first: it may be modified in the journal!
3707 */
e2b911c5 3708 if (!test_opt(sb, NOLOAD) && ext4_has_feature_journal(sb)) {
617ba13b 3709 if (ext4_load_journal(sb, es, journal_devnum))
50460fe8 3710 goto failed_mount3a;
0390131b 3711 } else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) &&
e2b911c5 3712 ext4_has_feature_journal_needs_recovery(sb)) {
b31e1552
ES		 3713 ext4_msg(sb, KERN_ERR, "required journal recovery "
3714 "suppressed and not mounted read-only");
744692dc 3715 goto failed_mount_wq;
ac27a0ec 3716 } else {
1e381f60
DM		 3717 /* Nojournal mode, all journal mount options are illegal */
3718 if (test_opt2(sb, EXPLICIT_JOURNAL_CHECKSUM)) {
3719 ext4_msg(sb, KERN_ERR, "can't mount with "
3720 "journal_checksum, fs mounted w/o journal");
3721 goto failed_mount_wq;
3722 }
3723 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
3724 ext4_msg(sb, KERN_ERR, "can't mount with "
3725 "journal_async_commit, fs mounted w/o journal");
3726 goto failed_mount_wq;
3727 }
3728 if (sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) {
3729 ext4_msg(sb, KERN_ERR, "can't mount with "
3730 "commit=%lu, fs mounted w/o journal",
3731 sbi->s_commit_interval / HZ);
3732 goto failed_mount_wq;
3733 }
3734 if (EXT4_MOUNT_DATA_FLAGS &
3735 (sbi->s_mount_opt ^ sbi->s_def_mount_opt)) {
3736 ext4_msg(sb, KERN_ERR, "can't mount with "
3737 "data=, fs mounted w/o journal");
3738 goto failed_mount_wq;
3739 }
3740 sbi->s_def_mount_opt &= EXT4_MOUNT_JOURNAL_CHECKSUM;
3741 clear_opt(sb, JOURNAL_CHECKSUM);
fd8c37ec 3742 clear_opt(sb, DATA_FLAGS);
0390131b
FM		 3743 sbi->s_journal = NULL;
3744 needs_recovery = 0;
3745 goto no_journal;
ac27a0ec
DK		 3746 }
3747
e2b911c5 3748 if (ext4_has_feature_64bit(sb) &&
eb40a09c
JS		 3749 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
3750 JBD2_FEATURE_INCOMPAT_64BIT)) {
b31e1552 3751 ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
744692dc 3752 goto failed_mount_wq;
eb40a09c
JS		 3753 }
3754
25ed6e8a
DW		 3755 if (!set_journal_csum_feature_set(sb)) {
3756 ext4_msg(sb, KERN_ERR, "Failed to set journal checksum "
3757 "feature set");
3758 goto failed_mount_wq;
d4da6c9c 3759 }
818d276c 3760
ac27a0ec
DK		 3761 /* We have now updated the journal if required, so we can
3762 * validate the data journaling mode. */
3763 switch (test_opt(sb, DATA_FLAGS)) {
3764 case 0:
3765 /* No mode set, assume a default based on the journal
63f57933
AM		 3766 * capabilities: ORDERED_DATA if the journal can
3767 * cope, else JOURNAL_DATA
3768 */
dab291af
MC		 3769 if (jbd2_journal_check_available_features
3770 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
fd8c37ec 3771 set_opt(sb, ORDERED_DATA);
ac27a0ec 3772 else
fd8c37ec 3773 set_opt(sb, JOURNAL_DATA);
ac27a0ec
DK		 3774 break;
3775
617ba13b
MC		 3776 case EXT4_MOUNT_ORDERED_DATA:
3777 case EXT4_MOUNT_WRITEBACK_DATA:
dab291af
MC		 3778 if (!jbd2_journal_check_available_features
3779 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
b31e1552
ES		 3780 ext4_msg(sb, KERN_ERR, "Journal does not support "
3781 "requested data journaling mode");
744692dc 3782 goto failed_mount_wq;
ac27a0ec
DK		 3783 }
3784 default:
3785 break;
3786 }
b3881f74 3787 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
ac27a0ec 3788
18aadd47
BJ		 3789 sbi->s_journal->j_commit_callback = ext4_journal_commit_callback;
3790
ce7e010a 3791no_journal:
9c191f70
M		 3792 if (ext4_mballoc_ready) {
3793 sbi->s_mb_cache = ext4_xattr_create_cache(sb->s_id);
3794 if (!sbi->s_mb_cache) {
3795 ext4_msg(sb, KERN_ERR, "Failed to create an mb_cache");
3796 goto failed_mount_wq;
3797 }
3798 }
3799
e2b911c5 3800 if ((DUMMY_ENCRYPTION_ENABLED(sbi) || ext4_has_feature_encrypt(sb)) &&
1cb767cd
TT		 3801 (blocksize != PAGE_CACHE_SIZE)) {
3802 ext4_msg(sb, KERN_ERR,
3803 "Unsupported blocksize for fs encryption");
3804 goto failed_mount_wq;
3805 }
3806
e2b911c5
DW		 3807 if (DUMMY_ENCRYPTION_ENABLED(sbi) && !(sb->s_flags & MS_RDONLY) &&
3808 !ext4_has_feature_encrypt(sb)) {
3809 ext4_set_feature_encrypt(sb);
6ddb2447
TT		 3810 ext4_commit_super(sb, 1);
3811 }
3812
952fc18e
TT		 3813 /*
3814 * Get the # of file system overhead blocks from the
3815 * superblock if present.
3816 */
3817 if (es->s_overhead_clusters)
3818 sbi->s_overhead = le32_to_cpu(es->s_overhead_clusters);
3819 else {
07aa2ea1
LC		 3820 err = ext4_calculate_overhead(sb);
3821 if (err)
952fc18e
TT		 3822 goto failed_mount_wq;
3823 }
3824
fd89d5f2
TH		 3825 /*
3826 * The maximum number of concurrent works can be high and
3827 * concurrency isn't really necessary. Limit it to 1.
3828 */
2e8fa54e
JK		 3829 EXT4_SB(sb)->rsv_conversion_wq =
3830 alloc_workqueue("ext4-rsv-conversion", WQ_MEM_RECLAIM | WQ_UNBOUND, 1);
3831 if (!EXT4_SB(sb)->rsv_conversion_wq) {
3832 printk(KERN_ERR "EXT4-fs: failed to create workqueue\n");
07aa2ea1 3833 ret = -ENOMEM;
2e8fa54e
JK		 3834 goto failed_mount4;
3835 }
3836
ac27a0ec 3837 /*
dab291af 3838 * The jbd2_journal_load will have done any necessary log recovery,
ac27a0ec
DK		 3839 * so we can safely mount the rest of the filesystem now.
3840 */
3841
1d1fe1ee
DH		 3842 root = ext4_iget(sb, EXT4_ROOT_INO);
3843 if (IS_ERR(root)) {
b31e1552 3844 ext4_msg(sb, KERN_ERR, "get root inode failed");
1d1fe1ee 3845 ret = PTR_ERR(root);
32a9bb57 3846 root = NULL;
ac27a0ec
DK		 3847 goto failed_mount4;
3848 }
3849 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
b31e1552 3850 ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
94bf608a 3851 iput(root);
ac27a0ec
DK		 3852 goto failed_mount4;
3853 }
48fde701 3854 sb->s_root = d_make_root(root);
1d1fe1ee 3855 if (!sb->s_root) {
b31e1552 3856 ext4_msg(sb, KERN_ERR, "get root dentry failed");
1d1fe1ee
DH		 3857 ret = -ENOMEM;
3858 goto failed_mount4;
3859 }
ac27a0ec 3860
7e84b621
ES		 3861 if (ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY))
3862 sb->s_flags |= MS_RDONLY;
ef7f3835
KS		 3863
3864 /* determine the minimum size of new large inodes, if present */
3865 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
3866 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
3867 EXT4_GOOD_OLD_INODE_SIZE;
e2b911c5 3868 if (ext4_has_feature_extra_isize(sb)) {
ef7f3835
KS		 3869 if (sbi->s_want_extra_isize <
3870 le16_to_cpu(es->s_want_extra_isize))
3871 sbi->s_want_extra_isize =
3872 le16_to_cpu(es->s_want_extra_isize);
3873 if (sbi->s_want_extra_isize <
3874 le16_to_cpu(es->s_min_extra_isize))
3875 sbi->s_want_extra_isize =
3876 le16_to_cpu(es->s_min_extra_isize);
3877 }
3878 }
3879 /* Check if enough inode space is available */
3880 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
3881 sbi->s_inode_size) {
3882 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
3883 EXT4_GOOD_OLD_INODE_SIZE;
b31e1552
ES		 3884 ext4_msg(sb, KERN_INFO, "required extra inode space not"
3885 "available");
ef7f3835
KS		 3886 }
3887
b5799018 3888 ext4_set_resv_clusters(sb);
27dd4385 3889
6fd058f7
TT		 3890 err = ext4_setup_system_zone(sb);
3891 if (err) {
b31e1552 3892 ext4_msg(sb, KERN_ERR, "failed to initialize system "
fbe845dd 3893 "zone (%d)", err);
f9ae9cf5
TT		 3894 goto failed_mount4a;
3895 }
3896
3897 ext4_ext_init(sb);
3898 err = ext4_mb_init(sb);
3899 if (err) {
3900 ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)",
3901 err);
dcf2d804 3902 goto failed_mount5;
c2774d84
AK		 3903 }
3904
d5e03cbb
TT		 3905 block = ext4_count_free_clusters(sb);
3906 ext4_free_blocks_count_set(sbi->s_es,
3907 EXT4_C2B(sbi, block));
908c7f19
TH		 3908 err = percpu_counter_init(&sbi->s_freeclusters_counter, block,
3909 GFP_KERNEL);
d5e03cbb
TT		 3910 if (!err) {
3911 unsigned long freei = ext4_count_free_inodes(sb);
3912 sbi->s_es->s_free_inodes_count = cpu_to_le32(freei);
908c7f19
TH		 3913 err = percpu_counter_init(&sbi->s_freeinodes_counter, freei,
3914 GFP_KERNEL);
d5e03cbb
TT		 3915 }
3916 if (!err)
3917 err = percpu_counter_init(&sbi->s_dirs_counter,
908c7f19 3918 ext4_count_dirs(sb), GFP_KERNEL);
d5e03cbb 3919 if (!err)
908c7f19
TH		 3920 err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0,
3921 GFP_KERNEL);
d5e03cbb
TT		 3922 if (err) {
3923 ext4_msg(sb, KERN_ERR, "insufficient memory");
3924 goto failed_mount6;
3925 }
3926
e2b911c5 3927 if (ext4_has_feature_flex_bg(sb))
d5e03cbb
TT		 3928 if (!ext4_fill_flex_info(sb)) {
3929 ext4_msg(sb, KERN_ERR,
3930 "unable to initialize "
3931 "flex_bg meta info!");
3932 goto failed_mount6;
3933 }
3934
bfff6873
LC		 3935 err = ext4_register_li_request(sb, first_not_zeroed);
3936 if (err)
dcf2d804 3937 goto failed_mount6;
bfff6873 3938
b5799018 3939 err = ext4_register_sysfs(sb);
dcf2d804
TM		 3940 if (err)
3941 goto failed_mount7;
3197ebdb 3942
9b2ff357
JK		 3943#ifdef CONFIG_QUOTA
3944 /* Enable quota usage during mount. */
e2b911c5 3945 if (ext4_has_feature_quota(sb) && !(sb->s_flags & MS_RDONLY)) {
9b2ff357
JK		 3946 err = ext4_enable_quotas(sb);
3947 if (err)
3948 goto failed_mount8;
3949 }
3950#endif /* CONFIG_QUOTA */
3951
617ba13b
MC		 3952 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
3953 ext4_orphan_cleanup(sb, es);
3954 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
0390131b 3955 if (needs_recovery) {
b31e1552 3956 ext4_msg(sb, KERN_INFO, "recovery complete");
0390131b
FM		 3957 ext4_mark_recovery_complete(sb, es);
3958 }
3959 if (EXT4_SB(sb)->s_journal) {
3960 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
3961 descr = " journalled data mode";
3962 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
3963 descr = " ordered data mode";
3964 else
3965 descr = " writeback data mode";
3966 } else
3967 descr = "out journal";
3968
79add3a3
LC		 3969 if (test_opt(sb, DISCARD)) {
3970 struct request_queue *q = bdev_get_queue(sb->s_bdev);
3971 if (!blk_queue_discard(q))
3972 ext4_msg(sb, KERN_WARNING,
3973 "mounting with \"discard\" option, but "
3974 "the device does not support discard");
3975 }
3976
e294a537
TT		 3977 if (___ratelimit(&ext4_mount_msg_ratelimit, "EXT4-fs mount"))
3978 ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. "
3979 "Opts: %s%s%s", descr, sbi->s_es->s_mount_opts,
3980 *sbi->s_es->s_mount_opts ? "; " : "", orig_data);
ac27a0ec 3981
66e61a9e
TT		 3982 if (es->s_error_count)
3983 mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */
ac27a0ec 3984
efbed4dc
TT		 3985 /* Enable message ratelimiting. Default is 10 messages per 5 secs. */
3986 ratelimit_state_init(&sbi->s_err_ratelimit_state, 5 * HZ, 10);
3987 ratelimit_state_init(&sbi->s_warning_ratelimit_state, 5 * HZ, 10);
3988 ratelimit_state_init(&sbi->s_msg_ratelimit_state, 5 * HZ, 10);
3989
d4c402d9 3990 kfree(orig_data);
ac27a0ec
DK		 3991 return 0;
3992
617ba13b 3993cantfind_ext4:
ac27a0ec 3994 if (!silent)
b31e1552 3995 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
ac27a0ec
DK		 3996 goto failed_mount;
3997
72ba7450
TT		 3998#ifdef CONFIG_QUOTA
3999failed_mount8:
ebd173be 4000 ext4_unregister_sysfs(sb);
72ba7450 4001#endif
dcf2d804
TM		 4002failed_mount7:
4003 ext4_unregister_li_request(sb);
4004failed_mount6:
f9ae9cf5 4005 ext4_mb_release(sb);
d5e03cbb 4006 if (sbi->s_flex_groups)
b93b41d4 4007 kvfree(sbi->s_flex_groups);
d5e03cbb
TT		 4008 percpu_counter_destroy(&sbi->s_freeclusters_counter);
4009 percpu_counter_destroy(&sbi->s_freeinodes_counter);
4010 percpu_counter_destroy(&sbi->s_dirs_counter);
4011 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
00764937 4012failed_mount5:
f9ae9cf5
TT		 4013 ext4_ext_release(sb);
4014 ext4_release_system_zone(sb);
4015failed_mount4a:
94bf608a 4016 dput(sb->s_root);
32a9bb57 4017 sb->s_root = NULL;
94bf608a 4018failed_mount4:
b31e1552 4019 ext4_msg(sb, KERN_ERR, "mount failed");
2e8fa54e
JK		 4020 if (EXT4_SB(sb)->rsv_conversion_wq)
4021 destroy_workqueue(EXT4_SB(sb)->rsv_conversion_wq);
4c0425ff 4022failed_mount_wq:
0390131b
FM		 4023 if (sbi->s_journal) {
4024 jbd2_journal_destroy(sbi->s_journal);
4025 sbi->s_journal = NULL;
4026 }
50460fe8 4027failed_mount3a:
d3922a77 4028 ext4_es_unregister_shrinker(sbi);
eb68d0e2 4029failed_mount3:
9105bb14 4030 del_timer_sync(&sbi->s_err_report);
c5e06d10
JL		 4031 if (sbi->s_mmp_tsk)
4032 kthread_stop(sbi->s_mmp_tsk);
ac27a0ec
DK		 4033failed_mount2:
4034 for (i = 0; i < db_count; i++)
4035 brelse(sbi->s_group_desc[i]);
b93b41d4 4036 kvfree(sbi->s_group_desc);
ac27a0ec 4037failed_mount:
0441984a
DW		 4038 if (sbi->s_chksum_driver)
4039 crypto_free_shash(sbi->s_chksum_driver);
ac27a0ec 4040#ifdef CONFIG_QUOTA
a2d4a646 4041 for (i = 0; i < EXT4_MAXQUOTAS; i++)
ac27a0ec
DK		 4042 kfree(sbi->s_qf_names[i]);
4043#endif
617ba13b 4044 ext4_blkdev_remove(sbi);
ac27a0ec
DK		 4045 brelse(bh);
4046out_fail:
4047 sb->s_fs_info = NULL;
f6830165 4048 kfree(sbi->s_blockgroup_lock);
ac27a0ec 4049 kfree(sbi);
dcc7dae3 4050out_free_orig:
d4c402d9 4051 kfree(orig_data);
07aa2ea1 4052 return err ? err : ret;
ac27a0ec
DK		 4053}
4054
4055/*
4056 * Setup any per-fs journal parameters now. We'll do this both on
4057 * initial mount, once the journal has been initialised but before we've
4058 * done any recovery; and again on any subsequent remount.
4059 */
617ba13b 4060static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
ac27a0ec 4061{
617ba13b 4062 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4063
30773840
TT		 4064 journal->j_commit_interval = sbi->s_commit_interval;
4065 journal->j_min_batch_time = sbi->s_min_batch_time;
4066 journal->j_max_batch_time = sbi->s_max_batch_time;
ac27a0ec 4067
a931da6a 4068 write_lock(&journal->j_state_lock);
ac27a0ec 4069 if (test_opt(sb, BARRIER))
dab291af 4070 journal->j_flags |= JBD2_BARRIER;
ac27a0ec 4071 else
dab291af 4072 journal->j_flags &= ~JBD2_BARRIER;
5bf5683a
HK		 4073 if (test_opt(sb, DATA_ERR_ABORT))
4074 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
4075 else
4076 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
a931da6a 4077 write_unlock(&journal->j_state_lock);
ac27a0ec
DK		 4078}
4079
617ba13b 4080static journal_t *ext4_get_journal(struct super_block *sb,
ac27a0ec
DK		 4081 unsigned int journal_inum)
4082{
4083 struct inode *journal_inode;
4084 journal_t *journal;
4085
e2b911c5 4086 BUG_ON(!ext4_has_feature_journal(sb));
0390131b 4087
ac27a0ec
DK		 4088 /* First, test for the existence of a valid inode on disk. Bad
4089 * things happen if we iget() an unused inode, as the subsequent
4090 * iput() will try to delete it. */
4091
1d1fe1ee
DH		 4092 journal_inode = ext4_iget(sb, journal_inum);
4093 if (IS_ERR(journal_inode)) {
b31e1552 4094 ext4_msg(sb, KERN_ERR, "no journal found");
ac27a0ec
DK		 4095 return NULL;
4096 }
4097 if (!journal_inode->i_nlink) {
4098 make_bad_inode(journal_inode);
4099 iput(journal_inode);
b31e1552 4100 ext4_msg(sb, KERN_ERR, "journal inode is deleted");
ac27a0ec
DK		 4101 return NULL;
4102 }
4103
e5f8eab8 4104 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
ac27a0ec 4105 journal_inode, journal_inode->i_size);
1d1fe1ee 4106 if (!S_ISREG(journal_inode->i_mode)) {
b31e1552 4107 ext4_msg(sb, KERN_ERR, "invalid journal inode");
ac27a0ec
DK		 4108 iput(journal_inode);
4109 return NULL;
4110 }
4111
dab291af 4112 journal = jbd2_journal_init_inode(journal_inode);
ac27a0ec 4113 if (!journal) {
b31e1552 4114 ext4_msg(sb, KERN_ERR, "Could not load journal inode");
ac27a0ec
DK		 4115 iput(journal_inode);
4116 return NULL;
4117 }
4118 journal->j_private = sb;
617ba13b 4119 ext4_init_journal_params(sb, journal);
ac27a0ec
DK		 4120 return journal;
4121}
4122
617ba13b 4123static journal_t *ext4_get_dev_journal(struct super_block *sb,
ac27a0ec
DK		 4124 dev_t j_dev)
4125{
2b2d6d01 4126 struct buffer_head *bh;
ac27a0ec 4127 journal_t *journal;
617ba13b
MC		 4128 ext4_fsblk_t start;
4129 ext4_fsblk_t len;
ac27a0ec 4130 int hblock, blocksize;
617ba13b 4131 ext4_fsblk_t sb_block;
ac27a0ec 4132 unsigned long offset;
2b2d6d01 4133 struct ext4_super_block *es;
ac27a0ec
DK		 4134 struct block_device *bdev;
4135
e2b911c5 4136 BUG_ON(!ext4_has_feature_journal(sb));
0390131b 4137
b31e1552 4138 bdev = ext4_blkdev_get(j_dev, sb);
ac27a0ec
DK		 4139 if (bdev == NULL)
4140 return NULL;
4141
ac27a0ec 4142 blocksize = sb->s_blocksize;
e1defc4f 4143 hblock = bdev_logical_block_size(bdev);
ac27a0ec 4144 if (blocksize < hblock) {
b31e1552
ES		 4145 ext4_msg(sb, KERN_ERR,
4146 "blocksize too small for journal device");
ac27a0ec
DK		 4147 goto out_bdev;
4148 }
4149
617ba13b
MC		 4150 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
4151 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
ac27a0ec
DK		 4152 set_blocksize(bdev, blocksize);
4153 if (!(bh = __bread(bdev, sb_block, blocksize))) {
b31e1552
ES		 4154 ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
4155 "external journal");
ac27a0ec
DK		 4156 goto out_bdev;
4157 }
4158
2716b802 4159 es = (struct ext4_super_block *) (bh->b_data + offset);
617ba13b 4160 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
ac27a0ec 4161 !(le32_to_cpu(es->s_feature_incompat) &
617ba13b 4162 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
b31e1552
ES		 4163 ext4_msg(sb, KERN_ERR, "external journal has "
4164 "bad superblock");
ac27a0ec
DK		 4165 brelse(bh);
4166 goto out_bdev;
4167 }
4168
df4763be
DW		 4169 if ((le32_to_cpu(es->s_feature_ro_compat) &
4170 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) &&
4171 es->s_checksum != ext4_superblock_csum(sb, es)) {
4172 ext4_msg(sb, KERN_ERR, "external journal has "
4173 "corrupt superblock");
4174 brelse(bh);
4175 goto out_bdev;
4176 }
4177
617ba13b 4178 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
b31e1552 4179 ext4_msg(sb, KERN_ERR, "journal UUID does not match");
ac27a0ec
DK		 4180 brelse(bh);
4181 goto out_bdev;
4182 }
4183
bd81d8ee 4184 len = ext4_blocks_count(es);
ac27a0ec
DK		 4185 start = sb_block + 1;
4186 brelse(bh); /* we're done with the superblock */
4187
dab291af 4188 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
ac27a0ec
DK		 4189 start, len, blocksize);
4190 if (!journal) {
b31e1552 4191 ext4_msg(sb, KERN_ERR, "failed to create device journal");
ac27a0ec
DK		 4192 goto out_bdev;
4193 }
4194 journal->j_private = sb;
9f203507 4195 ll_rw_block(READ | REQ_META | REQ_PRIO, 1, &journal->j_sb_buffer);
ac27a0ec
DK		 4196 wait_on_buffer(journal->j_sb_buffer);
4197 if (!buffer_uptodate(journal->j_sb_buffer)) {
b31e1552 4198 ext4_msg(sb, KERN_ERR, "I/O error on journal device");
ac27a0ec
DK		 4199 goto out_journal;
4200 }
4201 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
b31e1552
ES		 4202 ext4_msg(sb, KERN_ERR, "External journal has more than one "
4203 "user (unsupported) - %d",
ac27a0ec
DK		 4204 be32_to_cpu(journal->j_superblock->s_nr_users));
4205 goto out_journal;
4206 }
617ba13b
MC		 4207 EXT4_SB(sb)->journal_bdev = bdev;
4208 ext4_init_journal_params(sb, journal);
ac27a0ec 4209 return journal;
0b8e58a1 4210
ac27a0ec 4211out_journal:
dab291af 4212 jbd2_journal_destroy(journal);
ac27a0ec 4213out_bdev:
617ba13b 4214 ext4_blkdev_put(bdev);
ac27a0ec
DK		 4215 return NULL;
4216}
4217
617ba13b
MC		 4218static int ext4_load_journal(struct super_block *sb,
4219 struct ext4_super_block *es,
ac27a0ec
DK		 4220 unsigned long journal_devnum)
4221{
4222 journal_t *journal;
4223 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
4224 dev_t journal_dev;
4225 int err = 0;
4226 int really_read_only;
4227
e2b911c5 4228 BUG_ON(!ext4_has_feature_journal(sb));
0390131b 4229
ac27a0ec
DK		 4230 if (journal_devnum &&
4231 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
b31e1552
ES		 4232 ext4_msg(sb, KERN_INFO, "external journal device major/minor "
4233 "numbers have changed");
ac27a0ec
DK		 4234 journal_dev = new_decode_dev(journal_devnum);
4235 } else
4236 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
4237
4238 really_read_only = bdev_read_only(sb->s_bdev);
4239
4240 /*
4241 * Are we loading a blank journal or performing recovery after a
4242 * crash? For recovery, we need to check in advance whether we
4243 * can get read-write access to the device.
4244 */
e2b911c5 4245 if (ext4_has_feature_journal_needs_recovery(sb)) {
ac27a0ec 4246 if (sb->s_flags & MS_RDONLY) {
b31e1552
ES		 4247 ext4_msg(sb, KERN_INFO, "INFO: recovery "
4248 "required on readonly filesystem");
ac27a0ec 4249 if (really_read_only) {
b31e1552
ES		 4250 ext4_msg(sb, KERN_ERR, "write access "
4251 "unavailable, cannot proceed");
ac27a0ec
DK		 4252 return -EROFS;
4253 }
b31e1552
ES		 4254 ext4_msg(sb, KERN_INFO, "write access will "
4255 "be enabled during recovery");
ac27a0ec
DK		 4256 }
4257 }
4258
4259 if (journal_inum && journal_dev) {
b31e1552
ES		 4260 ext4_msg(sb, KERN_ERR, "filesystem has both journal "
4261 "and inode journals!");
ac27a0ec
DK		 4262 return -EINVAL;
4263 }
4264
4265 if (journal_inum) {
617ba13b 4266 if (!(journal = ext4_get_journal(sb, journal_inum)))
ac27a0ec
DK		 4267 return -EINVAL;
4268 } else {
617ba13b 4269 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
ac27a0ec
DK		 4270 return -EINVAL;
4271 }
4272
90576c0b 4273 if (!(journal->j_flags & JBD2_BARRIER))
b31e1552 4274 ext4_msg(sb, KERN_INFO, "barriers disabled");
4776004f 4275
e2b911c5 4276 if (!ext4_has_feature_journal_needs_recovery(sb))
dab291af 4277 err = jbd2_journal_wipe(journal, !really_read_only);
1c13d5c0
TT		 4278 if (!err) {
4279 char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL);
4280 if (save)
4281 memcpy(save, ((char *) es) +
4282 EXT4_S_ERR_START, EXT4_S_ERR_LEN);
dab291af 4283 err = jbd2_journal_load(journal);
1c13d5c0
TT		 4284 if (save)
4285 memcpy(((char *) es) + EXT4_S_ERR_START,
4286 save, EXT4_S_ERR_LEN);
4287 kfree(save);
4288 }
ac27a0ec
DK		 4289
4290 if (err) {
b31e1552 4291 ext4_msg(sb, KERN_ERR, "error loading journal");
dab291af 4292 jbd2_journal_destroy(journal);
ac27a0ec
DK		 4293 return err;
4294 }
4295
617ba13b
MC		 4296 EXT4_SB(sb)->s_journal = journal;
4297 ext4_clear_journal_err(sb, es);
ac27a0ec 4298
c41303ce 4299 if (!really_read_only && journal_devnum &&
ac27a0ec
DK		 4300 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
4301 es->s_journal_dev = cpu_to_le32(journal_devnum);
ac27a0ec
DK		 4302
4303 /* Make sure we flush the recovery flag to disk. */
e2d67052 4304 ext4_commit_super(sb, 1);
ac27a0ec
DK		 4305 }
4306
4307 return 0;
4308}
4309
e2d67052 4310static int ext4_commit_super(struct super_block *sb, int sync)
ac27a0ec 4311{
e2d67052 4312 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
617ba13b 4313 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
c4be0c1d 4314 int error = 0;
ac27a0ec 4315
bdfe0cbd 4316 if (!sbh || block_device_ejected(sb))
c4be0c1d 4317 return error;
914258bf
TT		 4318 if (buffer_write_io_error(sbh)) {
4319 /*
4320 * Oh, dear. A previous attempt to write the
4321 * superblock failed. This could happen because the
4322 * USB device was yanked out. Or it could happen to
4323 * be a transient write error and maybe the block will
4324 * be remapped. Nothing we can do but to retry the
4325 * write and hope for the best.
4326 */
b31e1552
ES		 4327 ext4_msg(sb, KERN_ERR, "previous I/O error to "
4328 "superblock detected");
914258bf
TT		 4329 clear_buffer_write_io_error(sbh);
4330 set_buffer_uptodate(sbh);
4331 }
71290b36
TT		 4332 /*
4333 * If the file system is mounted read-only, don't update the
4334 * superblock write time. This avoids updating the superblock
4335 * write time when we are mounting the root file system
4336 * read/only but we need to replay the journal; at that point,
4337 * for people who are east of GMT and who make their clock
4338 * tick in localtime for Windows bug-for-bug compatibility,
4339 * the clock is set in the future, and this will cause e2fsck
4340 * to complain and force a full file system check.
4341 */
4342 if (!(sb->s_flags & MS_RDONLY))
4343 es->s_wtime = cpu_to_le32(get_seconds());
f613dfcb
TT		 4344 if (sb->s_bdev->bd_part)
4345 es->s_kbytes_written =
4346 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written +
afc32f7e
TT		 4347 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
4348 EXT4_SB(sb)->s_sectors_written_start) >> 1));
f613dfcb
TT		 4349 else
4350 es->s_kbytes_written =
4351 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written);
d5e03cbb
TT		 4352 if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeclusters_counter))
4353 ext4_free_blocks_count_set(es,
57042651
TT		 4354 EXT4_C2B(EXT4_SB(sb), percpu_counter_sum_positive(
4355 &EXT4_SB(sb)->s_freeclusters_counter)));
d5e03cbb
TT		 4356 if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeinodes_counter))
4357 es->s_free_inodes_count =
4358 cpu_to_le32(percpu_counter_sum_positive(
ce7e010a 4359 &EXT4_SB(sb)->s_freeinodes_counter));
ac27a0ec 4360 BUFFER_TRACE(sbh, "marking dirty");
06db49e6 4361 ext4_superblock_csum_set(sb);
ac27a0ec 4362 mark_buffer_dirty(sbh);
914258bf 4363 if (sync) {
564bc402
DJ		 4364 error = __sync_dirty_buffer(sbh,
4365 test_opt(sb, BARRIER) ? WRITE_FUA : WRITE_SYNC);
c4be0c1d
TS		 4366 if (error)
4367 return error;
4368
4369 error = buffer_write_io_error(sbh);
4370 if (error) {
b31e1552
ES		 4371 ext4_msg(sb, KERN_ERR, "I/O error while writing "
4372 "superblock");
914258bf
TT		 4373 clear_buffer_write_io_error(sbh);
4374 set_buffer_uptodate(sbh);
4375 }
4376 }
c4be0c1d 4377 return error;
ac27a0ec
DK		 4378}
4379
ac27a0ec
DK		 4380/*
4381 * Have we just finished recovery? If so, and if we are mounting (or
4382 * remounting) the filesystem readonly, then we will end up with a
4383 * consistent fs on disk. Record that fact.
4384 */
2b2d6d01
TT		 4385static void ext4_mark_recovery_complete(struct super_block *sb,
4386 struct ext4_super_block *es)
ac27a0ec 4387{
617ba13b 4388 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 4389
e2b911c5 4390 if (!ext4_has_feature_journal(sb)) {
0390131b
FM		 4391 BUG_ON(journal != NULL);
4392 return;
4393 }
dab291af 4394 jbd2_journal_lock_updates(journal);
7ffe1ea8
HK		 4395 if (jbd2_journal_flush(journal) < 0)
4396 goto out;
4397
e2b911c5 4398 if (ext4_has_feature_journal_needs_recovery(sb) &&
ac27a0ec 4399 sb->s_flags & MS_RDONLY) {
e2b911c5 4400 ext4_clear_feature_journal_needs_recovery(sb);
e2d67052 4401 ext4_commit_super(sb, 1);
ac27a0ec 4402 }
7ffe1ea8
HK		 4403
4404out:
dab291af 4405 jbd2_journal_unlock_updates(journal);
ac27a0ec
DK		 4406}
4407
4408/*
4409 * If we are mounting (or read-write remounting) a filesystem whose journal
4410 * has recorded an error from a previous lifetime, move that error to the
4411 * main filesystem now.
4412 */
2b2d6d01
TT		 4413static void ext4_clear_journal_err(struct super_block *sb,
4414 struct ext4_super_block *es)
ac27a0ec
DK		 4415{
4416 journal_t *journal;
4417 int j_errno;
4418 const char *errstr;
4419
e2b911c5 4420 BUG_ON(!ext4_has_feature_journal(sb));
0390131b 4421
617ba13b 4422 journal = EXT4_SB(sb)->s_journal;
ac27a0ec
DK		 4423
4424 /*
4425 * Now check for any error status which may have been recorded in the
617ba13b 4426 * journal by a prior ext4_error() or ext4_abort()
ac27a0ec
DK		 4427 */
4428
dab291af 4429 j_errno = jbd2_journal_errno(journal);
ac27a0ec
DK		 4430 if (j_errno) {
4431 char nbuf[16];
4432
617ba13b 4433 errstr = ext4_decode_error(sb, j_errno, nbuf);
12062ddd 4434 ext4_warning(sb, "Filesystem error recorded "
ac27a0ec 4435 "from previous mount: %s", errstr);
12062ddd 4436 ext4_warning(sb, "Marking fs in need of filesystem check.");
ac27a0ec 4437
617ba13b
MC		 4438 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
4439 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
e2d67052 4440 ext4_commit_super(sb, 1);
ac27a0ec 4441
dab291af 4442 jbd2_journal_clear_err(journal);
d796c52e 4443 jbd2_journal_update_sb_errno(journal);
ac27a0ec
DK		 4444 }
4445}
4446
4447/*
4448 * Force the running and committing transactions to commit,
4449 * and wait on the commit.
4450 */
617ba13b 4451int ext4_force_commit(struct super_block *sb)
ac27a0ec
DK		 4452{
4453 journal_t *journal;
ac27a0ec
DK		 4454
4455 if (sb->s_flags & MS_RDONLY)
4456 return 0;
4457
617ba13b 4458 journal = EXT4_SB(sb)->s_journal;
b1deefc9 4459 return ext4_journal_force_commit(journal);
ac27a0ec
DK		 4460}
4461
617ba13b 4462static int ext4_sync_fs(struct super_block *sb, int wait)
ac27a0ec 4463{
14ce0cb4 4464 int ret = 0;
9eddacf9 4465 tid_t target;
06a407f1 4466 bool needs_barrier = false;
8d5d02e6 4467 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4468
9bffad1e 4469 trace_ext4_sync_fs(sb, wait);
2e8fa54e 4470 flush_workqueue(sbi->rsv_conversion_wq);
a1177825
JK		 4471 /*
4472 * Writeback quota in non-journalled quota case - journalled quota has
4473 * no dirty dquots
4474 */
4475 dquot_writeback_dquots(sb, -1);
06a407f1
DM		 4476 /*
4477 * Data writeback is possible w/o journal transaction, so barrier must
4478 * being sent at the end of the function. But we can skip it if
4479 * transaction_commit will do it for us.
4480 */
bda32530
TT		 4481 if (sbi->s_journal) {
4482 target = jbd2_get_latest_transaction(sbi->s_journal);
4483 if (wait && sbi->s_journal->j_flags & JBD2_BARRIER &&
4484 !jbd2_trans_will_send_data_barrier(sbi->s_journal, target))
4485 needs_barrier = true;
4486
4487 if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
4488 if (wait)
4489 ret = jbd2_log_wait_commit(sbi->s_journal,
4490 target);
4491 }
4492 } else if (wait && test_opt(sb, BARRIER))
06a407f1 4493 needs_barrier = true;
06a407f1
DM		 4494 if (needs_barrier) {
4495 int err;
4496 err = blkdev_issue_flush(sb->s_bdev, GFP_KERNEL, NULL);
4497 if (!ret)
4498 ret = err;
0390131b 4499 }
06a407f1
DM		 4500
4501 return ret;
4502}
4503
ac27a0ec
DK		 4504/*
4505 * LVM calls this function before a (read-only) snapshot is created. This
4506 * gives us a chance to flush the journal completely and mark the fs clean.
be4f27d3
YY		 4507 *
4508 * Note that only this function cannot bring a filesystem to be in a clean
8e8ad8a5
JK		 4509 * state independently. It relies on upper layer to stop all data & metadata
4510 * modifications.
ac27a0ec 4511 */
c4be0c1d 4512static int ext4_freeze(struct super_block *sb)
ac27a0ec 4513{
c4be0c1d
TS		 4514 int error = 0;
4515 journal_t *journal;
ac27a0ec 4516
9ca92389
TT		 4517 if (sb->s_flags & MS_RDONLY)
4518 return 0;
ac27a0ec 4519
9ca92389 4520 journal = EXT4_SB(sb)->s_journal;
7ffe1ea8 4521
bb044576
TT		 4522 if (journal) {
4523 /* Now we set up the journal barrier. */
4524 jbd2_journal_lock_updates(journal);
ac27a0ec 4525
bb044576
TT		 4526 /*
4527 * Don't clear the needs_recovery flag if we failed to
4528 * flush the journal.
4529 */
4530 error = jbd2_journal_flush(journal);
4531 if (error < 0)
4532 goto out;
c642dc9e
ES		 4533
4534 /* Journal blocked and flushed, clear needs_recovery flag. */
e2b911c5 4535 ext4_clear_feature_journal_needs_recovery(sb);
bb044576 4536 }
9ca92389 4537
9ca92389 4538 error = ext4_commit_super(sb, 1);
6b0310fb 4539out:
bb044576
TT		 4540 if (journal)
4541 /* we rely on upper layer to stop further updates */
4542 jbd2_journal_unlock_updates(journal);
6b0310fb 4543 return error;
ac27a0ec
DK		 4544}
4545
4546/*
4547 * Called by LVM after the snapshot is done. We need to reset the RECOVER
4548 * flag here, even though the filesystem is not technically dirty yet.
4549 */
c4be0c1d 4550static int ext4_unfreeze(struct super_block *sb)
ac27a0ec 4551{
9ca92389
TT		 4552 if (sb->s_flags & MS_RDONLY)
4553 return 0;
4554
c642dc9e
ES		 4555 if (EXT4_SB(sb)->s_journal) {
4556 /* Reset the needs_recovery flag before the fs is unlocked. */
e2b911c5 4557 ext4_set_feature_journal_needs_recovery(sb);
c642dc9e
ES		 4558 }
4559
9ca92389 4560 ext4_commit_super(sb, 1);
c4be0c1d 4561 return 0;
ac27a0ec
DK		 4562}
4563
673c6100
TT		 4564/*
4565 * Structure to save mount options for ext4_remount's benefit
4566 */
4567struct ext4_mount_options {
4568 unsigned long s_mount_opt;
a2595b8a 4569 unsigned long s_mount_opt2;
08cefc7a
EB		 4570 kuid_t s_resuid;
4571 kgid_t s_resgid;
673c6100
TT		 4572 unsigned long s_commit_interval;
4573 u32 s_min_batch_time, s_max_batch_time;
4574#ifdef CONFIG_QUOTA
4575 int s_jquota_fmt;
a2d4a646 4576 char *s_qf_names[EXT4_MAXQUOTAS];
673c6100
TT		 4577#endif
4578};
4579
2b2d6d01 4580static int ext4_remount(struct super_block *sb, int *flags, char *data)
ac27a0ec 4581{
2b2d6d01 4582 struct ext4_super_block *es;
617ba13b 4583 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4584 unsigned long old_sb_flags;
617ba13b 4585 struct ext4_mount_options old_opts;
c79d967d 4586 int enable_quota = 0;
8a266467 4587 ext4_group_t g;
b3881f74 4588 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
c5e06d10 4589 int err = 0;
ac27a0ec 4590#ifdef CONFIG_QUOTA
03dafb5f 4591 int i, j;
ac27a0ec 4592#endif
d4c402d9 4593 char *orig_data = kstrdup(data, GFP_KERNEL);
ac27a0ec
DK		 4594
4595 /* Store the original options */
4596 old_sb_flags = sb->s_flags;
4597 old_opts.s_mount_opt = sbi->s_mount_opt;
a2595b8a 4598 old_opts.s_mount_opt2 = sbi->s_mount_opt2;
ac27a0ec
DK		 4599 old_opts.s_resuid = sbi->s_resuid;
4600 old_opts.s_resgid = sbi->s_resgid;
4601 old_opts.s_commit_interval = sbi->s_commit_interval;
30773840
TT		 4602 old_opts.s_min_batch_time = sbi->s_min_batch_time;
4603 old_opts.s_max_batch_time = sbi->s_max_batch_time;
ac27a0ec
DK		 4604#ifdef CONFIG_QUOTA
4605 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
a2d4a646 4606 for (i = 0; i < EXT4_MAXQUOTAS; i++)
03dafb5f
CG		 4607 if (sbi->s_qf_names[i]) {
4608 old_opts.s_qf_names[i] = kstrdup(sbi->s_qf_names[i],
4609 GFP_KERNEL);
4610 if (!old_opts.s_qf_names[i]) {
4611 for (j = 0; j < i; j++)
4612 kfree(old_opts.s_qf_names[j]);
3e36a163 4613 kfree(orig_data);
03dafb5f
CG		 4614 return -ENOMEM;
4615 }
4616 } else
4617 old_opts.s_qf_names[i] = NULL;
ac27a0ec 4618#endif
b3881f74
TT		 4619 if (sbi->s_journal && sbi->s_journal->j_task->io_context)
4620 journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
ac27a0ec 4621
661aa520 4622 if (!parse_options(data, sb, NULL, &journal_ioprio, 1)) {
ac27a0ec
DK		 4623 err = -EINVAL;
4624 goto restore_opts;
4625 }
4626
6b992ff2 4627 if ((old_opts.s_mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) ^
c6d3d56d
DW		 4628 test_opt(sb, JOURNAL_CHECKSUM)) {
4629 ext4_msg(sb, KERN_ERR, "changing journal_checksum "
2d5b86e0
ES		 4630 "during remount not supported; ignoring");
4631 sbi->s_mount_opt ^= EXT4_MOUNT_JOURNAL_CHECKSUM;
6b992ff2
DW		 4632 }
4633
6ae6514b
PS		 4634 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
4635 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
4636 ext4_msg(sb, KERN_ERR, "can't mount with "
4637 "both data=journal and delalloc");
4638 err = -EINVAL;
4639 goto restore_opts;
4640 }
4641 if (test_opt(sb, DIOREAD_NOLOCK)) {
4642 ext4_msg(sb, KERN_ERR, "can't mount with "
4643 "both data=journal and dioread_nolock");
4644 err = -EINVAL;
4645 goto restore_opts;
4646 }
923ae0ff
RZ		 4647 if (test_opt(sb, DAX)) {
4648 ext4_msg(sb, KERN_ERR, "can't mount with "
4649 "both data=journal and dax");
4650 err = -EINVAL;
4651 goto restore_opts;
4652 }
4653 }
4654
4655 if ((sbi->s_mount_opt ^ old_opts.s_mount_opt) & EXT4_MOUNT_DAX) {
4656 ext4_msg(sb, KERN_WARNING, "warning: refusing change of "
4657 "dax flag with busy inodes while remounting");
4658 sbi->s_mount_opt ^= EXT4_MOUNT_DAX;
6ae6514b
PS		 4659 }
4660
4ab2f15b 4661 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
c67d859e 4662 ext4_abort(sb, "Abort forced by user");
ac27a0ec
DK		 4663
4664 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
482a7425 4665 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec
DK		 4666
4667 es = sbi->s_es;
4668
b3881f74 4669 if (sbi->s_journal) {
0390131b 4670 ext4_init_journal_params(sb, sbi->s_journal);
b3881f74
TT		 4671 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
4672 }
ac27a0ec 4673
a2fd66d0
TT		 4674 if (*flags & MS_LAZYTIME)
4675 sb->s_flags |= MS_LAZYTIME;
4676
661aa520 4677 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
4ab2f15b 4678 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) {
ac27a0ec
DK		 4679 err = -EROFS;
4680 goto restore_opts;
4681 }
4682
4683 if (*flags & MS_RDONLY) {
38c03b34
TT		 4684 err = sync_filesystem(sb);
4685 if (err < 0)
4686 goto restore_opts;
0f0dd62f
CH		 4687 err = dquot_suspend(sb, -1);
4688 if (err < 0)
c79d967d 4689 goto restore_opts;
c79d967d 4690
ac27a0ec
DK		 4691 /*
4692 * First of all, the unconditional stuff we have to do
4693 * to disable replay of the journal when we next remount
4694 */
4695 sb->s_flags |= MS_RDONLY;
4696
4697 /*
4698 * OK, test if we are remounting a valid rw partition
4699 * readonly, and if so set the rdonly flag and then
4700 * mark the partition as valid again.
4701 */
617ba13b
MC		 4702 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
4703 (sbi->s_mount_state & EXT4_VALID_FS))
ac27a0ec
DK		 4704 es->s_state = cpu_to_le16(sbi->s_mount_state);
4705
a63c9eb2 4706 if (sbi->s_journal)
0390131b 4707 ext4_mark_recovery_complete(sb, es);
ac27a0ec 4708 } else {
a13fb1a4 4709 /* Make sure we can mount this feature set readwrite */
e2b911c5 4710 if (ext4_has_feature_readonly(sb) ||
2cb5cc8b 4711 !ext4_feature_set_ok(sb, 0)) {
ac27a0ec
DK		 4712 err = -EROFS;
4713 goto restore_opts;
4714 }
8a266467
TT		 4715 /*
4716 * Make sure the group descriptor checksums
0b8e58a1 4717 * are sane. If they aren't, refuse to remount r/w.
8a266467
TT		 4718 */
4719 for (g = 0; g < sbi->s_groups_count; g++) {
4720 struct ext4_group_desc *gdp =
4721 ext4_get_group_desc(sb, g, NULL);
4722
feb0ab32 4723 if (!ext4_group_desc_csum_verify(sb, g, gdp)) {
b31e1552
ES		 4724 ext4_msg(sb, KERN_ERR,
4725 "ext4_remount: Checksum for group %u failed (%u!=%u)",
e2b911c5 4726 g, le16_to_cpu(ext4_group_desc_csum(sb, g, gdp)),
8a266467 4727 le16_to_cpu(gdp->bg_checksum));
6a797d27 4728 err = -EFSBADCRC;
8a266467
TT		 4729 goto restore_opts;
4730 }
4731 }
4732
ead6596b
ES		 4733 /*
4734 * If we have an unprocessed orphan list hanging
4735 * around from a previously readonly bdev mount,
4736 * require a full umount/remount for now.
4737 */
4738 if (es->s_last_orphan) {
b31e1552 4739 ext4_msg(sb, KERN_WARNING, "Couldn't "
ead6596b
ES		 4740 "remount RDWR because of unprocessed "
4741 "orphan inode list. Please "
b31e1552 4742 "umount/remount instead");
ead6596b
ES		 4743 err = -EINVAL;
4744 goto restore_opts;
4745 }
4746
ac27a0ec
DK		 4747 /*
4748 * Mounting a RDONLY partition read-write, so reread
4749 * and store the current valid flag. (It may have
4750 * been changed by e2fsck since we originally mounted
4751 * the partition.)
4752 */
0390131b
FM		 4753 if (sbi->s_journal)
4754 ext4_clear_journal_err(sb, es);
ac27a0ec 4755 sbi->s_mount_state = le16_to_cpu(es->s_state);
2b2d6d01 4756 if (!ext4_setup_super(sb, es, 0))
ac27a0ec 4757 sb->s_flags &= ~MS_RDONLY;
e2b911c5 4758 if (ext4_has_feature_mmp(sb))
c5e06d10
JL		 4759 if (ext4_multi_mount_protect(sb,
4760 le64_to_cpu(es->s_mmp_block))) {
4761 err = -EROFS;
4762 goto restore_opts;
4763 }
c79d967d 4764 enable_quota = 1;
ac27a0ec
DK		 4765 }
4766 }
bfff6873
LC		 4767
4768 /*
4769 * Reinitialize lazy itable initialization thread based on
4770 * current settings
4771 */
4772 if ((sb->s_flags & MS_RDONLY) || !test_opt(sb, INIT_INODE_TABLE))
4773 ext4_unregister_li_request(sb);
4774 else {
4775 ext4_group_t first_not_zeroed;
4776 first_not_zeroed = ext4_has_uninit_itable(sb);
4777 ext4_register_li_request(sb, first_not_zeroed);
4778 }
4779
6fd058f7 4780 ext4_setup_system_zone(sb);
d096ad0f 4781 if (sbi->s_journal == NULL && !(old_sb_flags & MS_RDONLY))
e2d67052 4782 ext4_commit_super(sb, 1);
0390131b 4783
ac27a0ec
DK		 4784#ifdef CONFIG_QUOTA
4785 /* Release old quota file names */
a2d4a646 4786 for (i = 0; i < EXT4_MAXQUOTAS; i++)
03dafb5f 4787 kfree(old_opts.s_qf_names[i]);
7c319d32
AK		 4788 if (enable_quota) {
4789 if (sb_any_quota_suspended(sb))
4790 dquot_resume(sb, -1);
e2b911c5 4791 else if (ext4_has_feature_quota(sb)) {
7c319d32 4792 err = ext4_enable_quotas(sb);
07724f98 4793 if (err)
7c319d32 4794 goto restore_opts;
7c319d32
AK		 4795 }
4796 }
ac27a0ec 4797#endif
d4c402d9 4798
a26f4992 4799 *flags = (*flags & ~MS_LAZYTIME) | (sb->s_flags & MS_LAZYTIME);
d4c402d9
CW		 4800 ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s", orig_data);
4801 kfree(orig_data);
ac27a0ec 4802 return 0;
0b8e58a1 4803
ac27a0ec
DK		 4804restore_opts:
4805 sb->s_flags = old_sb_flags;
4806 sbi->s_mount_opt = old_opts.s_mount_opt;
a2595b8a 4807 sbi->s_mount_opt2 = old_opts.s_mount_opt2;
ac27a0ec
DK		 4808 sbi->s_resuid = old_opts.s_resuid;
4809 sbi->s_resgid = old_opts.s_resgid;
4810 sbi->s_commit_interval = old_opts.s_commit_interval;
30773840
TT		 4811 sbi->s_min_batch_time = old_opts.s_min_batch_time;
4812 sbi->s_max_batch_time = old_opts.s_max_batch_time;
ac27a0ec
DK		 4813#ifdef CONFIG_QUOTA
4814 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
a2d4a646 4815 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
03dafb5f 4816 kfree(sbi->s_qf_names[i]);
ac27a0ec
DK		 4817 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
4818 }
4819#endif
d4c402d9 4820 kfree(orig_data);
ac27a0ec
DK		 4821 return err;
4822}
4823
2b2d6d01 4824static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
ac27a0ec
DK		 4825{
4826 struct super_block *sb = dentry->d_sb;
617ba13b
MC		 4827 struct ext4_sb_info *sbi = EXT4_SB(sb);
4828 struct ext4_super_block *es = sbi->s_es;
27dd4385 4829 ext4_fsblk_t overhead = 0, resv_blocks;
960cc398 4830 u64 fsid;
d02a9391 4831 s64 bfree;
27dd4385 4832 resv_blocks = EXT4_C2B(sbi, atomic64_read(&sbi->s_resv_clusters));
ac27a0ec 4833
952fc18e
TT		 4834 if (!test_opt(sb, MINIX_DF))
4835 overhead = sbi->s_overhead;
ac27a0ec 4836
617ba13b 4837 buf->f_type = EXT4_SUPER_MAGIC;
ac27a0ec 4838 buf->f_bsize = sb->s_blocksize;
b72f78cb 4839 buf->f_blocks = ext4_blocks_count(es) - EXT4_C2B(sbi, overhead);
57042651
TT		 4840 bfree = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) -
4841 percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter);
d02a9391 4842 /* prevent underflow in case that few free space is available */
57042651 4843 buf->f_bfree = EXT4_C2B(sbi, max_t(s64, bfree, 0));
27dd4385
LC		 4844 buf->f_bavail = buf->f_bfree -
4845 (ext4_r_blocks_count(es) + resv_blocks);
4846 if (buf->f_bfree < (ext4_r_blocks_count(es) + resv_blocks))
ac27a0ec
DK		 4847 buf->f_bavail = 0;
4848 buf->f_files = le32_to_cpu(es->s_inodes_count);
52d9f3b4 4849 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
617ba13b 4850 buf->f_namelen = EXT4_NAME_LEN;
960cc398
PE		 4851 fsid = le64_to_cpup((void *)es->s_uuid) ^
4852 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
4853 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
4854 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
0b8e58a1 4855
ac27a0ec
DK		 4856 return 0;
4857}
4858
0b8e58a1
AD		 4859/* Helper function for writing quotas on sync - we need to start transaction
4860 * before quota file is locked for write. Otherwise the are possible deadlocks:
ac27a0ec 4861 * Process 1 Process 2
617ba13b 4862 * ext4_create() quota_sync()
a269eb18 4863 * jbd2_journal_start() write_dquot()
871a2931 4864 * dquot_initialize() down(dqio_mutex)
dab291af 4865 * down(dqio_mutex) jbd2_journal_start()
ac27a0ec
DK		 4866 *
4867 */
4868
4869#ifdef CONFIG_QUOTA
4870
4871static inline struct inode *dquot_to_inode(struct dquot *dquot)
4872{
4c376dca 4873 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_id.type];
ac27a0ec
DK		 4874}
4875
617ba13b 4876static int ext4_write_dquot(struct dquot *dquot)
ac27a0ec
DK		 4877{
4878 int ret, err;
4879 handle_t *handle;
4880 struct inode *inode;
4881
4882 inode = dquot_to_inode(dquot);
9924a92a 4883 handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
0b8e58a1 4884 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 4885 if (IS_ERR(handle))
4886 return PTR_ERR(handle);
4887 ret = dquot_commit(dquot);
617ba13b 4888 err = ext4_journal_stop(handle);
ac27a0ec
DK		 4889 if (!ret)
4890 ret = err;
4891 return ret;
4892}
4893
617ba13b 4894static int ext4_acquire_dquot(struct dquot *dquot)
ac27a0ec
DK		 4895{
4896 int ret, err;
4897 handle_t *handle;
4898
9924a92a 4899 handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
0b8e58a1 4900 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 4901 if (IS_ERR(handle))
4902 return PTR_ERR(handle);
4903 ret = dquot_acquire(dquot);
617ba13b 4904 err = ext4_journal_stop(handle);
ac27a0ec
DK		 4905 if (!ret)
4906 ret = err;
4907 return ret;
4908}
4909
617ba13b 4910static int ext4_release_dquot(struct dquot *dquot)
ac27a0ec
DK		 4911{
4912 int ret, err;
4913 handle_t *handle;
4914
9924a92a 4915 handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
0b8e58a1 4916 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
9c3013e9
JK		 4917 if (IS_ERR(handle)) {
4918 /* Release dquot anyway to avoid endless cycle in dqput() */
4919 dquot_release(dquot);
ac27a0ec 4920 return PTR_ERR(handle);
9c3013e9 4921 }
ac27a0ec 4922 ret = dquot_release(dquot);
617ba13b 4923 err = ext4_journal_stop(handle);
ac27a0ec
DK		 4924 if (!ret)
4925 ret = err;
4926 return ret;
4927}
4928
617ba13b 4929static int ext4_mark_dquot_dirty(struct dquot *dquot)
ac27a0ec 4930{
262b4662
JK		 4931 struct super_block *sb = dquot->dq_sb;
4932 struct ext4_sb_info *sbi = EXT4_SB(sb);
4933
2c8be6b2 4934 /* Are we journaling quotas? */
e2b911c5 4935 if (ext4_has_feature_quota(sb) ||
262b4662 4936 sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
ac27a0ec 4937 dquot_mark_dquot_dirty(dquot);
617ba13b 4938 return ext4_write_dquot(dquot);
ac27a0ec
DK		 4939 } else {
4940 return dquot_mark_dquot_dirty(dquot);
4941 }
4942}
4943
617ba13b 4944static int ext4_write_info(struct super_block *sb, int type)
ac27a0ec
DK		 4945{
4946 int ret, err;
4947 handle_t *handle;
4948
4949 /* Data block + inode block */
2b0143b5 4950 handle = ext4_journal_start(d_inode(sb->s_root), EXT4_HT_QUOTA, 2);
ac27a0ec
DK		 4951 if (IS_ERR(handle))
4952 return PTR_ERR(handle);
4953 ret = dquot_commit_info(sb, type);
617ba13b 4954 err = ext4_journal_stop(handle);
ac27a0ec
DK		 4955 if (!ret)
4956 ret = err;
4957 return ret;
4958}
4959
4960/*
4961 * Turn on quotas during mount time - we need to find
4962 * the quota file and such...
4963 */
617ba13b 4964static int ext4_quota_on_mount(struct super_block *sb, int type)
ac27a0ec 4965{
287a8095
CH		 4966 return dquot_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
4967 EXT4_SB(sb)->s_jquota_fmt, type);
ac27a0ec
DK		 4968}
4969
4970/*
4971 * Standard function to be called on quota_on
4972 */
617ba13b 4973static int ext4_quota_on(struct super_block *sb, int type, int format_id,
f00c9e44 4974 struct path *path)
ac27a0ec
DK		 4975{
4976 int err;
ac27a0ec
DK		 4977
4978 if (!test_opt(sb, QUOTA))
4979 return -EINVAL;
0623543b 4980
ac27a0ec 4981 /* Quotafile not on the same filesystem? */
d8c9584e 4982 if (path->dentry->d_sb != sb)
ac27a0ec 4983 return -EXDEV;
0623543b
JK		 4984 /* Journaling quota? */
4985 if (EXT4_SB(sb)->s_qf_names[type]) {
2b2d6d01 4986 /* Quotafile not in fs root? */
f00c9e44 4987 if (path->dentry->d_parent != sb->s_root)
b31e1552
ES		 4988 ext4_msg(sb, KERN_WARNING,
4989 "Quota file not on filesystem root. "
4990 "Journaled quota will not work");
2b2d6d01 4991 }
0623543b
JK		 4992
4993 /*
4994 * When we journal data on quota file, we have to flush journal to see
4995 * all updates to the file when we bypass pagecache...
4996 */
0390131b 4997 if (EXT4_SB(sb)->s_journal &&
2b0143b5 4998 ext4_should_journal_data(d_inode(path->dentry))) {
0623543b
JK		 4999 /*
5000 * We don't need to lock updates but journal_flush() could
5001 * otherwise be livelocked...
5002 */
5003 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
7ffe1ea8 5004 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
0623543b 5005 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
f00c9e44 5006 if (err)
7ffe1ea8 5007 return err;
0623543b
JK		 5008 }
5009
f00c9e44 5010 return dquot_quota_on(sb, type, format_id, path);
ac27a0ec
DK		 5011}
5012
7c319d32
AK		 5013static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
5014 unsigned int flags)
5015{
5016 int err;
5017 struct inode *qf_inode;
a2d4a646 5018 unsigned long qf_inums[EXT4_MAXQUOTAS] = {
7c319d32
AK		 5019 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
5020 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum)
5021 };
5022
e2b911c5 5023 BUG_ON(!ext4_has_feature_quota(sb));
7c319d32
AK		 5024
5025 if (!qf_inums[type])
5026 return -EPERM;
5027
5028 qf_inode = ext4_iget(sb, qf_inums[type]);
5029 if (IS_ERR(qf_inode)) {
5030 ext4_error(sb, "Bad quota inode # %lu", qf_inums[type]);
5031 return PTR_ERR(qf_inode);
5032 }
5033
bcb13850
JK		 5034 /* Don't account quota for quota files to avoid recursion */
5035 qf_inode->i_flags |= S_NOQUOTA;
7c319d32
AK		 5036 err = dquot_enable(qf_inode, type, format_id, flags);
5037 iput(qf_inode);
5038
5039 return err;
5040}
5041
5042/* Enable usage tracking for all quota types. */
5043static int ext4_enable_quotas(struct super_block *sb)
5044{
5045 int type, err = 0;
a2d4a646 5046 unsigned long qf_inums[EXT4_MAXQUOTAS] = {
7c319d32
AK		 5047 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
5048 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum)
5049 };
5050
5051 sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE;
a2d4a646 5052 for (type = 0; type < EXT4_MAXQUOTAS; type++) {
7c319d32
AK		 5053 if (qf_inums[type]) {
5054 err = ext4_quota_enable(sb, type, QFMT_VFS_V1,
5055 DQUOT_USAGE_ENABLED);
5056 if (err) {
5057 ext4_warning(sb,
72ba7450
TT		 5058 "Failed to enable quota tracking "
5059 "(type=%d, err=%d). Please run "
5060 "e2fsck to fix.", type, err);
7c319d32
AK		 5061 return err;
5062 }
5063 }
5064 }
5065 return 0;
5066}
5067
ca0e05e4
DM		 5068static int ext4_quota_off(struct super_block *sb, int type)
5069{
21f97697
JK		 5070 struct inode *inode = sb_dqopt(sb)->files[type];
5071 handle_t *handle;
5072
87009d86
DM		 5073 /* Force all delayed allocation blocks to be allocated.
5074 * Caller already holds s_umount sem */
5075 if (test_opt(sb, DELALLOC))
ca0e05e4 5076 sync_filesystem(sb);
ca0e05e4 5077
0b268590
AG		 5078 if (!inode)
5079 goto out;
5080
21f97697
JK		 5081 /* Update modification times of quota files when userspace can
5082 * start looking at them */
9924a92a 5083 handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1);
21f97697
JK		 5084 if (IS_ERR(handle))
5085 goto out;
5086 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
5087 ext4_mark_inode_dirty(handle, inode);
5088 ext4_journal_stop(handle);
5089
5090out:
ca0e05e4
DM		 5091 return dquot_quota_off(sb, type);
5092}
5093
ac27a0ec
DK		 5094/* Read data from quotafile - avoid pagecache and such because we cannot afford
5095 * acquiring the locks... As quota files are never truncated and quota code
25985edc 5096 * itself serializes the operations (and no one else should touch the files)
ac27a0ec 5097 * we don't have to be afraid of races */
617ba13b 5098static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec
DK		 5099 size_t len, loff_t off)
5100{
5101 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 5102 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 5103 int offset = off & (sb->s_blocksize - 1);
5104 int tocopy;
5105 size_t toread;
5106 struct buffer_head *bh;
5107 loff_t i_size = i_size_read(inode);
5108
5109 if (off > i_size)
5110 return 0;
5111 if (off+len > i_size)
5112 len = i_size-off;
5113 toread = len;
5114 while (toread > 0) {
5115 tocopy = sb->s_blocksize - offset < toread ?
5116 sb->s_blocksize - offset : toread;
1c215028
TT		 5117 bh = ext4_bread(NULL, inode, blk, 0);
5118 if (IS_ERR(bh))
5119 return PTR_ERR(bh);
ac27a0ec
DK		 5120 if (!bh) /* A hole? */
5121 memset(data, 0, tocopy);
5122 else
5123 memcpy(data, bh->b_data+offset, tocopy);
5124 brelse(bh);
5125 offset = 0;
5126 toread -= tocopy;
5127 data += tocopy;
5128 blk++;
5129 }
5130 return len;
5131}
5132
5133/* Write to quotafile (we know the transaction is already started and has
5134 * enough credits) */
617ba13b 5135static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec
DK		 5136 const char *data, size_t len, loff_t off)
5137{
5138 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 5139 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
1c215028 5140 int err, offset = off & (sb->s_blocksize - 1);
c5e298ae 5141 int retries = 0;
ac27a0ec
DK		 5142 struct buffer_head *bh;
5143 handle_t *handle = journal_current_handle();
5144
0390131b 5145 if (EXT4_SB(sb)->s_journal && !handle) {
b31e1552
ES		 5146 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
5147 " cancelled because transaction is not started",
9c3013e9
JK		 5148 (unsigned long long)off, (unsigned long long)len);
5149 return -EIO;
5150 }
67eeb568
DM		 5151 /*
5152 * Since we account only one data block in transaction credits,
5153 * then it is impossible to cross a block boundary.
5154 */
5155 if (sb->s_blocksize - offset < len) {
5156 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
5157 " cancelled because not block aligned",
5158 (unsigned long long)off, (unsigned long long)len);
5159 return -EIO;
5160 }
5161
c5e298ae
TT		 5162 do {
5163 bh = ext4_bread(handle, inode, blk,
5164 EXT4_GET_BLOCKS_CREATE |
5165 EXT4_GET_BLOCKS_METADATA_NOFAIL);
5166 } while (IS_ERR(bh) && (PTR_ERR(bh) == -ENOSPC) &&
5167 ext4_should_retry_alloc(inode->i_sb, &retries));
1c215028
TT		 5168 if (IS_ERR(bh))
5169 return PTR_ERR(bh);
67eeb568
DM		 5170 if (!bh)
5171 goto out;
5d601255 5172 BUFFER_TRACE(bh, "get write access");
62d2b5f2
JK		 5173 err = ext4_journal_get_write_access(handle, bh);
5174 if (err) {
5175 brelse(bh);
1c215028 5176 return err;
ac27a0ec 5177 }
67eeb568
DM		 5178 lock_buffer(bh);
5179 memcpy(bh->b_data+offset, data, len);
5180 flush_dcache_page(bh->b_page);
5181 unlock_buffer(bh);
62d2b5f2 5182 err = ext4_handle_dirty_metadata(handle, NULL, bh);
67eeb568 5183 brelse(bh);
ac27a0ec 5184out:
67eeb568
DM		 5185 if (inode->i_size < off + len) {
5186 i_size_write(inode, off + len);
617ba13b 5187 EXT4_I(inode)->i_disksize = inode->i_size;
21f97697 5188 ext4_mark_inode_dirty(handle, inode);
ac27a0ec 5189 }
67eeb568 5190 return len;
ac27a0ec
DK		 5191}
5192
5193#endif
5194
152a0836
AV		 5195static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
5196 const char *dev_name, void *data)
ac27a0ec 5197{
152a0836 5198 return mount_bdev(fs_type, flags, dev_name, data, ext4_fill_super);
ac27a0ec
DK		 5199}
5200
c290ea01 5201#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2)
24b58424
TT		 5202static inline void register_as_ext2(void)
5203{
5204 int err = register_filesystem(&ext2_fs_type);
5205 if (err)
5206 printk(KERN_WARNING
5207 "EXT4-fs: Unable to register as ext2 (%d)\n", err);
5208}
5209
5210static inline void unregister_as_ext2(void)
5211{
5212 unregister_filesystem(&ext2_fs_type);
5213}
2035e776
TT		 5214
5215static inline int ext2_feature_set_ok(struct super_block *sb)
5216{
e2b911c5 5217 if (ext4_has_unknown_ext2_incompat_features(sb))
2035e776
TT		 5218 return 0;
5219 if (sb->s_flags & MS_RDONLY)
5220 return 1;
e2b911c5 5221 if (ext4_has_unknown_ext2_ro_compat_features(sb))
2035e776
TT		 5222 return 0;
5223 return 1;
5224}
24b58424
TT		 5225#else
5226static inline void register_as_ext2(void) { }
5227static inline void unregister_as_ext2(void) { }
2035e776 5228static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; }
24b58424
TT		 5229#endif
5230
24b58424
TT		 5231static inline void register_as_ext3(void)
5232{
5233 int err = register_filesystem(&ext3_fs_type);
5234 if (err)
5235 printk(KERN_WARNING
5236 "EXT4-fs: Unable to register as ext3 (%d)\n", err);
5237}
5238
5239static inline void unregister_as_ext3(void)
5240{
5241 unregister_filesystem(&ext3_fs_type);
5242}
2035e776
TT		 5243
5244static inline int ext3_feature_set_ok(struct super_block *sb)
5245{
e2b911c5 5246 if (ext4_has_unknown_ext3_incompat_features(sb))
2035e776 5247 return 0;
e2b911c5 5248 if (!ext4_has_feature_journal(sb))
2035e776
TT		 5249 return 0;
5250 if (sb->s_flags & MS_RDONLY)
5251 return 1;
e2b911c5 5252 if (ext4_has_unknown_ext3_ro_compat_features(sb))
2035e776
TT		 5253 return 0;
5254 return 1;
5255}
24b58424 5256
03010a33
TT		 5257static struct file_system_type ext4_fs_type = {
5258 .owner = THIS_MODULE,
5259 .name = "ext4",
152a0836 5260 .mount = ext4_mount,
03010a33
TT		 5261 .kill_sb = kill_block_super,
5262 .fs_flags = FS_REQUIRES_DEV,
5263};
7f78e035 5264MODULE_ALIAS_FS("ext4");
03010a33 5265
e9e3bcec
ES		 5266/* Shared across all ext4 file systems */
5267wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
5268struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ];
5269
5dabfc78 5270static int __init ext4_init_fs(void)
ac27a0ec 5271{
e9e3bcec 5272 int i, err;
c9de560d 5273
e294a537 5274 ratelimit_state_init(&ext4_mount_msg_ratelimit, 30 * HZ, 64);
07c0c5d8
AV		 5275 ext4_li_info = NULL;
5276 mutex_init(&ext4_li_mtx);
5277
9a4c8019 5278 /* Build-time check for flags consistency */
12e9b892 5279 ext4_check_flag_values();
e9e3bcec
ES		 5280
5281 for (i = 0; i < EXT4_WQ_HASH_SZ; i++) {
5282 mutex_init(&ext4__aio_mutex[i]);
5283 init_waitqueue_head(&ext4__ioend_wq[i]);
5284 }
5285
51865fda 5286 err = ext4_init_es();
6fd058f7
TT		 5287 if (err)
5288 return err;
51865fda
ZL		 5289
5290 err = ext4_init_pageio();
5291 if (err)
b5799018 5292 goto out5;
51865fda 5293
5dabfc78 5294 err = ext4_init_system_zone();
bd2d0210 5295 if (err)
b5799018 5296 goto out4;
857ac889 5297
b5799018 5298 err = ext4_init_sysfs();
dd68314c 5299 if (err)
b5799018 5300 goto out3;
857ac889 5301
5dabfc78 5302 err = ext4_init_mballoc();
c9de560d
AT		 5303 if (err)
5304 goto out2;
9c191f70
M		 5305 else
5306 ext4_mballoc_ready = 1;
ac27a0ec
DK		 5307 err = init_inodecache();
5308 if (err)
5309 goto out1;
24b58424 5310 register_as_ext3();
2035e776 5311 register_as_ext2();
03010a33 5312 err = register_filesystem(&ext4_fs_type);
ac27a0ec
DK		 5313 if (err)
5314 goto out;
bfff6873 5315
ac27a0ec
DK		 5316 return 0;
5317out:
24b58424
TT		 5318 unregister_as_ext2();
5319 unregister_as_ext3();
ac27a0ec
DK		 5320 destroy_inodecache();
5321out1:
9c191f70 5322 ext4_mballoc_ready = 0;
5dabfc78 5323 ext4_exit_mballoc();
9c191f70 5324out2:
b5799018
TT		 5325 ext4_exit_sysfs();
5326out3:
5dabfc78 5327 ext4_exit_system_zone();
b5799018 5328out4:
5dabfc78 5329 ext4_exit_pageio();
b5799018 5330out5:
51865fda
ZL		 5331 ext4_exit_es();
5332
ac27a0ec
DK		 5333 return err;
5334}
5335
5dabfc78 5336static void __exit ext4_exit_fs(void)
ac27a0ec 5337{
e298e73b 5338 ext4_exit_crypto();
bfff6873 5339 ext4_destroy_lazyinit_thread();
24b58424
TT		 5340 unregister_as_ext2();
5341 unregister_as_ext3();
03010a33 5342 unregister_filesystem(&ext4_fs_type);
ac27a0ec 5343 destroy_inodecache();
5dabfc78 5344 ext4_exit_mballoc();
b5799018 5345 ext4_exit_sysfs();
5dabfc78
TT		 5346 ext4_exit_system_zone();
5347 ext4_exit_pageio();
dd12ed14 5348 ext4_exit_es();
ac27a0ec
DK		 5349}
5350
5351MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
83982b6f 5352MODULE_DESCRIPTION("Fourth Extended Filesystem");
ac27a0ec 5353MODULE_LICENSE("GPL");
5dabfc78
TT		 5354module_init(ext4_init_fs)
5355module_exit(ext4_exit_fs)
Linux kernel - Deliverables
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