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lustre: remove unused declaration
[thirdparty/kernel/linux.git] / fs / ext4 / super.c
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ac27a0ec 1/*
617ba13b 2 * linux/fs/ext4/super.c
ac27a0ec
DK		 3 *
4 * Copyright (C) 1992, 1993, 1994, 1995
5 * Remy Card (card@masi.ibp.fr)
6 * Laboratoire MASI - Institut Blaise Pascal
7 * Universite Pierre et Marie Curie (Paris VI)
8 *
9 * from
10 *
11 * linux/fs/minix/inode.c
12 *
13 * Copyright (C) 1991, 1992 Linus Torvalds
14 *
15 * Big-endian to little-endian byte-swapping/bitmaps by
16 * David S. Miller (davem@caip.rutgers.edu), 1995
17 */
18
19#include <linux/module.h>
20#include <linux/string.h>
21#include <linux/fs.h>
22#include <linux/time.h>
c5ca7c76 23#include <linux/vmalloc.h>
ac27a0ec
DK		 24#include <linux/slab.h>
25#include <linux/init.h>
26#include <linux/blkdev.h>
66114cad 27#include <linux/backing-dev.h>
ac27a0ec 28#include <linux/parser.h>
ac27a0ec 29#include <linux/buffer_head.h>
a5694255 30#include <linux/exportfs.h>
ac27a0ec
DK		 31#include <linux/vfs.h>
32#include <linux/random.h>
33#include <linux/mount.h>
34#include <linux/namei.h>
35#include <linux/quotaops.h>
36#include <linux/seq_file.h>
3197ebdb 37#include <linux/ctype.h>
1330593e 38#include <linux/log2.h>
717d50e4 39#include <linux/crc16.h>
7abc52c2 40#include <linux/cleancache.h>
ac27a0ec
DK		 41#include <asm/uaccess.h>
42
bfff6873
LC		 43#include <linux/kthread.h>
44#include <linux/freezer.h>
45
3dcf5451 46#include "ext4.h"
4a092d73 47#include "ext4_extents.h" /* Needed for trace points definition */
3dcf5451 48#include "ext4_jbd2.h"
ac27a0ec
DK		 49#include "xattr.h"
50#include "acl.h"
3661d286 51#include "mballoc.h"
ac27a0ec 52
9bffad1e
TT		 53#define CREATE_TRACE_POINTS
54#include <trace/events/ext4.h>
55
0b75a840
LC		 56static struct ext4_lazy_init *ext4_li_info;
57static struct mutex ext4_li_mtx;
9c191f70 58static int ext4_mballoc_ready;
e294a537 59static struct ratelimit_state ext4_mount_msg_ratelimit;
9f6200bb 60
617ba13b 61static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
ac27a0ec 62 unsigned long journal_devnum);
2adf6da8 63static int ext4_show_options(struct seq_file *seq, struct dentry *root);
e2d67052 64static int ext4_commit_super(struct super_block *sb, int sync);
2b2d6d01
TT		 65static void ext4_mark_recovery_complete(struct super_block *sb,
66 struct ext4_super_block *es);
67static void ext4_clear_journal_err(struct super_block *sb,
68 struct ext4_super_block *es);
617ba13b 69static int ext4_sync_fs(struct super_block *sb, int wait);
2b2d6d01
TT		 70static int ext4_remount(struct super_block *sb, int *flags, char *data);
71static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
c4be0c1d 72static int ext4_unfreeze(struct super_block *sb);
c4be0c1d 73static int ext4_freeze(struct super_block *sb);
152a0836
AV		 74static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
75 const char *dev_name, void *data);
2035e776
TT		 76static inline int ext2_feature_set_ok(struct super_block *sb);
77static inline int ext3_feature_set_ok(struct super_block *sb);
d39195c3 78static int ext4_feature_set_ok(struct super_block *sb, int readonly);
bfff6873
LC		 79static void ext4_destroy_lazyinit_thread(void);
80static void ext4_unregister_li_request(struct super_block *sb);
8f1f7453 81static void ext4_clear_request_list(void);
ac27a0ec 82
e74031fd
JK		 83/*
84 * Lock ordering
85 *
86 * Note the difference between i_mmap_sem (EXT4_I(inode)->i_mmap_sem) and
87 * i_mmap_rwsem (inode->i_mmap_rwsem)!
88 *
89 * page fault path:
90 * mmap_sem -> sb_start_pagefault -> i_mmap_sem (r) -> transaction start ->
91 * page lock -> i_data_sem (rw)
92 *
93 * buffered write path:
94 * sb_start_write -> i_mutex -> mmap_sem
95 * sb_start_write -> i_mutex -> transaction start -> page lock ->
96 * i_data_sem (rw)
97 *
98 * truncate:
99 * sb_start_write -> i_mutex -> EXT4_STATE_DIOREAD_LOCK (w) -> i_mmap_sem (w) ->
100 * i_mmap_rwsem (w) -> page lock
101 * sb_start_write -> i_mutex -> EXT4_STATE_DIOREAD_LOCK (w) -> i_mmap_sem (w) ->
102 * transaction start -> i_data_sem (rw)
103 *
104 * direct IO:
105 * sb_start_write -> i_mutex -> EXT4_STATE_DIOREAD_LOCK (r) -> mmap_sem
106 * sb_start_write -> i_mutex -> EXT4_STATE_DIOREAD_LOCK (r) ->
107 * transaction start -> i_data_sem (rw)
108 *
109 * writepages:
110 * transaction start -> page lock(s) -> i_data_sem (rw)
111 */
112
c290ea01 113#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2)
2035e776
TT		 114static struct file_system_type ext2_fs_type = {
115 .owner = THIS_MODULE,
116 .name = "ext2",
117 .mount = ext4_mount,
118 .kill_sb = kill_block_super,
119 .fs_flags = FS_REQUIRES_DEV,
120};
7f78e035 121MODULE_ALIAS_FS("ext2");
fa7614dd 122MODULE_ALIAS("ext2");
2035e776
TT		 123#define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type)
124#else
125#define IS_EXT2_SB(sb) (0)
126#endif
127
128
ba69f9ab
JK		 129static struct file_system_type ext3_fs_type = {
130 .owner = THIS_MODULE,
131 .name = "ext3",
152a0836 132 .mount = ext4_mount,
ba69f9ab
JK		 133 .kill_sb = kill_block_super,
134 .fs_flags = FS_REQUIRES_DEV,
135};
7f78e035 136MODULE_ALIAS_FS("ext3");
fa7614dd 137MODULE_ALIAS("ext3");
ba69f9ab 138#define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type)
bd81d8ee 139
d25425f8
DW		 140static int ext4_verify_csum_type(struct super_block *sb,
141 struct ext4_super_block *es)
142{
e2b911c5 143 if (!ext4_has_feature_metadata_csum(sb))
d25425f8
DW		 144 return 1;
145
146 return es->s_checksum_type == EXT4_CRC32C_CHKSUM;
147}
148
a9c47317
DW		 149static __le32 ext4_superblock_csum(struct super_block *sb,
150 struct ext4_super_block *es)
151{
152 struct ext4_sb_info *sbi = EXT4_SB(sb);
153 int offset = offsetof(struct ext4_super_block, s_checksum);
154 __u32 csum;
155
156 csum = ext4_chksum(sbi, ~0, (char *)es, offset);
157
158 return cpu_to_le32(csum);
159}
160
c197855e
SH		 161static int ext4_superblock_csum_verify(struct super_block *sb,
162 struct ext4_super_block *es)
a9c47317 163{
9aa5d32b 164 if (!ext4_has_metadata_csum(sb))
a9c47317
DW		 165 return 1;
166
167 return es->s_checksum == ext4_superblock_csum(sb, es);
168}
169
06db49e6 170void ext4_superblock_csum_set(struct super_block *sb)
a9c47317 171{
06db49e6
TT		 172 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
173
9aa5d32b 174 if (!ext4_has_metadata_csum(sb))
a9c47317
DW		 175 return;
176
177 es->s_checksum = ext4_superblock_csum(sb, es);
178}
179
9933fc0a
TT		 180void *ext4_kvmalloc(size_t size, gfp_t flags)
181{
182 void *ret;
183
8be04b93 184 ret = kmalloc(size, flags | __GFP_NOWARN);
9933fc0a
TT		 185 if (!ret)
186 ret = __vmalloc(size, flags, PAGE_KERNEL);
187 return ret;
188}
189
190void *ext4_kvzalloc(size_t size, gfp_t flags)
191{
192 void *ret;
193
8be04b93 194 ret = kzalloc(size, flags | __GFP_NOWARN);
9933fc0a
TT		 195 if (!ret)
196 ret = __vmalloc(size, flags | __GFP_ZERO, PAGE_KERNEL);
197 return ret;
198}
199
8fadc143
AR		 200ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
201 struct ext4_group_desc *bg)
bd81d8ee 202{
3a14589c 203 return le32_to_cpu(bg->bg_block_bitmap_lo) |
8fadc143 204 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 205 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 206}
207
8fadc143
AR		 208ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
209 struct ext4_group_desc *bg)
bd81d8ee 210{
5272f837 211 return le32_to_cpu(bg->bg_inode_bitmap_lo) |
8fadc143 212 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 213 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 214}
215
8fadc143
AR		 216ext4_fsblk_t ext4_inode_table(struct super_block *sb,
217 struct ext4_group_desc *bg)
bd81d8ee 218{
5272f837 219 return le32_to_cpu(bg->bg_inode_table_lo) |
8fadc143 220 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 221 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
bd81d8ee
LV		 222}
223
021b65bb
TT		 224__u32 ext4_free_group_clusters(struct super_block *sb,
225 struct ext4_group_desc *bg)
560671a0
AK		 226{
227 return le16_to_cpu(bg->bg_free_blocks_count_lo) |
228 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 229 (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0);
560671a0
AK		 230}
231
232__u32 ext4_free_inodes_count(struct super_block *sb,
233 struct ext4_group_desc *bg)
234{
235 return le16_to_cpu(bg->bg_free_inodes_count_lo) |
236 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 237 (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0);
560671a0
AK		 238}
239
240__u32 ext4_used_dirs_count(struct super_block *sb,
241 struct ext4_group_desc *bg)
242{
243 return le16_to_cpu(bg->bg_used_dirs_count_lo) |
244 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 245 (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0);
560671a0
AK		 246}
247
248__u32 ext4_itable_unused_count(struct super_block *sb,
249 struct ext4_group_desc *bg)
250{
251 return le16_to_cpu(bg->bg_itable_unused_lo) |
252 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 253 (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0);
560671a0
AK		 254}
255
8fadc143
AR		 256void ext4_block_bitmap_set(struct super_block *sb,
257 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 258{
3a14589c 259 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 260 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
261 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 262}
263
8fadc143
AR		 264void ext4_inode_bitmap_set(struct super_block *sb,
265 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 266{
5272f837 267 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 268 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
269 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 270}
271
8fadc143
AR		 272void ext4_inode_table_set(struct super_block *sb,
273 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 274{
5272f837 275 bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 276 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
277 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 278}
279
021b65bb
TT		 280void ext4_free_group_clusters_set(struct super_block *sb,
281 struct ext4_group_desc *bg, __u32 count)
560671a0
AK		 282{
283 bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count);
284 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
285 bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16);
286}
287
288void ext4_free_inodes_set(struct super_block *sb,
289 struct ext4_group_desc *bg, __u32 count)
290{
291 bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count);
292 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
293 bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16);
294}
295
296void ext4_used_dirs_set(struct super_block *sb,
297 struct ext4_group_desc *bg, __u32 count)
298{
299 bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count);
300 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
301 bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16);
302}
303
304void ext4_itable_unused_set(struct super_block *sb,
305 struct ext4_group_desc *bg, __u32 count)
306{
307 bg->bg_itable_unused_lo = cpu_to_le16((__u16)count);
308 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
309 bg->bg_itable_unused_hi = cpu_to_le16(count >> 16);
310}
311
d3d1faf6 312
1c13d5c0
TT		 313static void __save_error_info(struct super_block *sb, const char *func,
314 unsigned int line)
315{
316 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
317
318 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
1b46617b
TT		 319 if (bdev_read_only(sb->s_bdev))
320 return;
1c13d5c0
TT		 321 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
322 es->s_last_error_time = cpu_to_le32(get_seconds());
323 strncpy(es->s_last_error_func, func, sizeof(es->s_last_error_func));
324 es->s_last_error_line = cpu_to_le32(line);
325 if (!es->s_first_error_time) {
326 es->s_first_error_time = es->s_last_error_time;
327 strncpy(es->s_first_error_func, func,
328 sizeof(es->s_first_error_func));
329 es->s_first_error_line = cpu_to_le32(line);
330 es->s_first_error_ino = es->s_last_error_ino;
331 es->s_first_error_block = es->s_last_error_block;
332 }
66e61a9e
TT		 333 /*
334 * Start the daily error reporting function if it hasn't been
335 * started already
336 */
337 if (!es->s_error_count)
338 mod_timer(&EXT4_SB(sb)->s_err_report, jiffies + 24*60*60*HZ);
ba39ebb6 339 le32_add_cpu(&es->s_error_count, 1);
1c13d5c0
TT		 340}
341
342static void save_error_info(struct super_block *sb, const char *func,
343 unsigned int line)
344{
345 __save_error_info(sb, func, line);
346 ext4_commit_super(sb, 1);
347}
348
bdfe0cbd
TT		 349/*
350 * The del_gendisk() function uninitializes the disk-specific data
351 * structures, including the bdi structure, without telling anyone
352 * else. Once this happens, any attempt to call mark_buffer_dirty()
353 * (for example, by ext4_commit_super), will cause a kernel OOPS.
354 * This is a kludge to prevent these oops until we can put in a proper
355 * hook in del_gendisk() to inform the VFS and file system layers.
356 */
357static int block_device_ejected(struct super_block *sb)
358{
359 struct inode *bd_inode = sb->s_bdev->bd_inode;
360 struct backing_dev_info *bdi = inode_to_bdi(bd_inode);
361
362 return bdi->dev == NULL;
363}
364
18aadd47
BJ		 365static void ext4_journal_commit_callback(journal_t *journal, transaction_t *txn)
366{
367 struct super_block *sb = journal->j_private;
368 struct ext4_sb_info *sbi = EXT4_SB(sb);
369 int error = is_journal_aborted(journal);
5d3ee208 370 struct ext4_journal_cb_entry *jce;
18aadd47 371
5d3ee208 372 BUG_ON(txn->t_state == T_FINISHED);
18aadd47 373 spin_lock(&sbi->s_md_lock);
5d3ee208
DM		 374 while (!list_empty(&txn->t_private_list)) {
375 jce = list_entry(txn->t_private_list.next,
376 struct ext4_journal_cb_entry, jce_list);
18aadd47
BJ		 377 list_del_init(&jce->jce_list);
378 spin_unlock(&sbi->s_md_lock);
379 jce->jce_func(sb, jce, error);
380 spin_lock(&sbi->s_md_lock);
381 }
382 spin_unlock(&sbi->s_md_lock);
383}
1c13d5c0 384
ac27a0ec
DK		 385/* Deal with the reporting of failure conditions on a filesystem such as
386 * inconsistencies detected or read IO failures.
387 *
388 * On ext2, we can store the error state of the filesystem in the
617ba13b 389 * superblock. That is not possible on ext4, because we may have other
ac27a0ec
DK		 390 * write ordering constraints on the superblock which prevent us from
391 * writing it out straight away; and given that the journal is about to
392 * be aborted, we can't rely on the current, or future, transactions to
393 * write out the superblock safely.
394 *
dab291af 395 * We'll just use the jbd2_journal_abort() error code to record an error in
d6b198bc 396 * the journal instead. On recovery, the journal will complain about
ac27a0ec
DK		 397 * that error until we've noted it down and cleared it.
398 */
399
617ba13b 400static void ext4_handle_error(struct super_block *sb)
ac27a0ec 401{
ac27a0ec
DK		 402 if (sb->s_flags & MS_RDONLY)
403 return;
404
2b2d6d01 405 if (!test_opt(sb, ERRORS_CONT)) {
617ba13b 406 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 407
4ab2f15b 408 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
ac27a0ec 409 if (journal)
dab291af 410 jbd2_journal_abort(journal, -EIO);
ac27a0ec 411 }
2b2d6d01 412 if (test_opt(sb, ERRORS_RO)) {
b31e1552 413 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
4418e141
DM		 414 /*
415 * Make sure updated value of ->s_mount_flags will be visible
416 * before ->s_flags update
417 */
418 smp_wmb();
ac27a0ec
DK		 419 sb->s_flags |= MS_RDONLY;
420 }
4327ba52
DJ		 421 if (test_opt(sb, ERRORS_PANIC)) {
422 if (EXT4_SB(sb)->s_journal &&
423 !(EXT4_SB(sb)->s_journal->j_flags & JBD2_REC_ERR))
424 return;
617ba13b 425 panic("EXT4-fs (device %s): panic forced after error\n",
ac27a0ec 426 sb->s_id);
4327ba52 427 }
ac27a0ec
DK		 428}
429
efbed4dc
TT		 430#define ext4_error_ratelimit(sb) \
431 ___ratelimit(&(EXT4_SB(sb)->s_err_ratelimit_state), \
432 "EXT4-fs error")
433
12062ddd 434void __ext4_error(struct super_block *sb, const char *function,
c398eda0 435 unsigned int line, const char *fmt, ...)
ac27a0ec 436{
0ff2ea7d 437 struct va_format vaf;
ac27a0ec
DK		 438 va_list args;
439
efbed4dc
TT		 440 if (ext4_error_ratelimit(sb)) {
441 va_start(args, fmt);
442 vaf.fmt = fmt;
443 vaf.va = &args;
444 printk(KERN_CRIT
445 "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n",
446 sb->s_id, function, line, current->comm, &vaf);
447 va_end(args);
448 }
f3fc0210 449 save_error_info(sb, function, line);
617ba13b 450 ext4_handle_error(sb);
ac27a0ec
DK		 451}
452
e7c96e8e
JP		 453void __ext4_error_inode(struct inode *inode, const char *function,
454 unsigned int line, ext4_fsblk_t block,
455 const char *fmt, ...)
273df556
FM		 456{
457 va_list args;
f7c21177 458 struct va_format vaf;
1c13d5c0 459 struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
273df556 460
1c13d5c0
TT		 461 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
462 es->s_last_error_block = cpu_to_le64(block);
efbed4dc
TT		 463 if (ext4_error_ratelimit(inode->i_sb)) {
464 va_start(args, fmt);
465 vaf.fmt = fmt;
466 vaf.va = &args;
467 if (block)
468 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
469 "inode #%lu: block %llu: comm %s: %pV\n",
470 inode->i_sb->s_id, function, line, inode->i_ino,
471 block, current->comm, &vaf);
472 else
473 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
474 "inode #%lu: comm %s: %pV\n",
475 inode->i_sb->s_id, function, line, inode->i_ino,
476 current->comm, &vaf);
477 va_end(args);
478 }
1c13d5c0 479 save_error_info(inode->i_sb, function, line);
273df556
FM		 480 ext4_handle_error(inode->i_sb);
481}
482
e7c96e8e
JP		 483void __ext4_error_file(struct file *file, const char *function,
484 unsigned int line, ext4_fsblk_t block,
485 const char *fmt, ...)
273df556
FM		 486{
487 va_list args;
f7c21177 488 struct va_format vaf;
1c13d5c0 489 struct ext4_super_block *es;
496ad9aa 490 struct inode *inode = file_inode(file);
273df556
FM		 491 char pathname[80], *path;
492
1c13d5c0
TT		 493 es = EXT4_SB(inode->i_sb)->s_es;
494 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
efbed4dc 495 if (ext4_error_ratelimit(inode->i_sb)) {
9bf39ab2 496 path = file_path(file, pathname, sizeof(pathname));
efbed4dc
TT		 497 if (IS_ERR(path))
498 path = "(unknown)";
499 va_start(args, fmt);
500 vaf.fmt = fmt;
501 vaf.va = &args;
502 if (block)
503 printk(KERN_CRIT
504 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
505 "block %llu: comm %s: path %s: %pV\n",
506 inode->i_sb->s_id, function, line, inode->i_ino,
507 block, current->comm, path, &vaf);
508 else
509 printk(KERN_CRIT
510 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
511 "comm %s: path %s: %pV\n",
512 inode->i_sb->s_id, function, line, inode->i_ino,
513 current->comm, path, &vaf);
514 va_end(args);
515 }
1c13d5c0 516 save_error_info(inode->i_sb, function, line);
273df556
FM		 517 ext4_handle_error(inode->i_sb);
518}
519
722887dd
TT		 520const char *ext4_decode_error(struct super_block *sb, int errno,
521 char nbuf[16])
ac27a0ec
DK		 522{
523 char *errstr = NULL;
524
525 switch (errno) {
6a797d27
DW		 526 case -EFSCORRUPTED:
527 errstr = "Corrupt filesystem";
528 break;
529 case -EFSBADCRC:
530 errstr = "Filesystem failed CRC";
531 break;
ac27a0ec
DK		 532 case -EIO:
533 errstr = "IO failure";
534 break;
535 case -ENOMEM:
536 errstr = "Out of memory";
537 break;
538 case -EROFS:
78f1ddbb
TT		 539 if (!sb || (EXT4_SB(sb)->s_journal &&
540 EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT))
ac27a0ec
DK		 541 errstr = "Journal has aborted";
542 else
543 errstr = "Readonly filesystem";
544 break;
545 default:
546 /* If the caller passed in an extra buffer for unknown
547 * errors, textualise them now. Else we just return
548 * NULL. */
549 if (nbuf) {
550 /* Check for truncated error codes... */
551 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
552 errstr = nbuf;
553 }
554 break;
555 }
556
557 return errstr;
558}
559
617ba13b 560/* __ext4_std_error decodes expected errors from journaling functions
ac27a0ec
DK		 561 * automatically and invokes the appropriate error response. */
562
c398eda0
TT		 563void __ext4_std_error(struct super_block *sb, const char *function,
564 unsigned int line, int errno)
ac27a0ec
DK		 565{
566 char nbuf[16];
567 const char *errstr;
568
569 /* Special case: if the error is EROFS, and we're not already
570 * inside a transaction, then there's really no point in logging
571 * an error. */
572 if (errno == -EROFS && journal_current_handle() == NULL &&
573 (sb->s_flags & MS_RDONLY))
574 return;
575
efbed4dc
TT		 576 if (ext4_error_ratelimit(sb)) {
577 errstr = ext4_decode_error(sb, errno, nbuf);
578 printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n",
579 sb->s_id, function, line, errstr);
580 }
ac27a0ec 581
efbed4dc 582 save_error_info(sb, function, line);
617ba13b 583 ext4_handle_error(sb);
ac27a0ec
DK		 584}
585
586/*
617ba13b 587 * ext4_abort is a much stronger failure handler than ext4_error. The
ac27a0ec
DK		 588 * abort function may be used to deal with unrecoverable failures such
589 * as journal IO errors or ENOMEM at a critical moment in log management.
590 *
591 * We unconditionally force the filesystem into an ABORT|READONLY state,
592 * unless the error response on the fs has been set to panic in which
593 * case we take the easy way out and panic immediately.
594 */
595
c67d859e 596void __ext4_abort(struct super_block *sb, const char *function,
c398eda0 597 unsigned int line, const char *fmt, ...)
ac27a0ec
DK		 598{
599 va_list args;
600
1c13d5c0 601 save_error_info(sb, function, line);
ac27a0ec 602 va_start(args, fmt);
c398eda0
TT		 603 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: ", sb->s_id,
604 function, line);
ac27a0ec
DK		 605 vprintk(fmt, args);
606 printk("\n");
607 va_end(args);
608
1c13d5c0
TT		 609 if ((sb->s_flags & MS_RDONLY) == 0) {
610 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
1c13d5c0 611 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
4418e141
DM		 612 /*
613 * Make sure updated value of ->s_mount_flags will be visible
614 * before ->s_flags update
615 */
616 smp_wmb();
617 sb->s_flags |= MS_RDONLY;
1c13d5c0
TT		 618 if (EXT4_SB(sb)->s_journal)
619 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
620 save_error_info(sb, function, line);
621 }
4327ba52
DJ		 622 if (test_opt(sb, ERRORS_PANIC)) {
623 if (EXT4_SB(sb)->s_journal &&
624 !(EXT4_SB(sb)->s_journal->j_flags & JBD2_REC_ERR))
625 return;
617ba13b 626 panic("EXT4-fs panic from previous error\n");
4327ba52 627 }
ac27a0ec
DK		 628}
629
e7c96e8e
JP		 630void __ext4_msg(struct super_block *sb,
631 const char *prefix, const char *fmt, ...)
b31e1552 632{
0ff2ea7d 633 struct va_format vaf;
b31e1552
ES		 634 va_list args;
635
efbed4dc
TT		 636 if (!___ratelimit(&(EXT4_SB(sb)->s_msg_ratelimit_state), "EXT4-fs"))
637 return;
638
b31e1552 639 va_start(args, fmt);
0ff2ea7d
JP		 640 vaf.fmt = fmt;
641 vaf.va = &args;
642 printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
b31e1552
ES		 643 va_end(args);
644}
645
b03a2f7e
AD		 646#define ext4_warning_ratelimit(sb) \
647 ___ratelimit(&(EXT4_SB(sb)->s_warning_ratelimit_state), \
648 "EXT4-fs warning")
649
12062ddd 650void __ext4_warning(struct super_block *sb, const char *function,
c398eda0 651 unsigned int line, const char *fmt, ...)
ac27a0ec 652{
0ff2ea7d 653 struct va_format vaf;
ac27a0ec
DK		 654 va_list args;
655
b03a2f7e 656 if (!ext4_warning_ratelimit(sb))
efbed4dc
TT		 657 return;
658
ac27a0ec 659 va_start(args, fmt);
0ff2ea7d
JP		 660 vaf.fmt = fmt;
661 vaf.va = &args;
662 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: %pV\n",
663 sb->s_id, function, line, &vaf);
ac27a0ec
DK		 664 va_end(args);
665}
666
b03a2f7e
AD		 667void __ext4_warning_inode(const struct inode *inode, const char *function,
668 unsigned int line, const char *fmt, ...)
669{
670 struct va_format vaf;
671 va_list args;
672
673 if (!ext4_warning_ratelimit(inode->i_sb))
674 return;
675
676 va_start(args, fmt);
677 vaf.fmt = fmt;
678 vaf.va = &args;
679 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: "
680 "inode #%lu: comm %s: %pV\n", inode->i_sb->s_id,
681 function, line, inode->i_ino, current->comm, &vaf);
682 va_end(args);
683}
684
e29136f8
TT		 685void __ext4_grp_locked_error(const char *function, unsigned int line,
686 struct super_block *sb, ext4_group_t grp,
687 unsigned long ino, ext4_fsblk_t block,
688 const char *fmt, ...)
5d1b1b3f
AK		 689__releases(bitlock)
690__acquires(bitlock)
691{
0ff2ea7d 692 struct va_format vaf;
5d1b1b3f
AK		 693 va_list args;
694 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
695
1c13d5c0
TT		 696 es->s_last_error_ino = cpu_to_le32(ino);
697 es->s_last_error_block = cpu_to_le64(block);
698 __save_error_info(sb, function, line);
0ff2ea7d 699
efbed4dc
TT		 700 if (ext4_error_ratelimit(sb)) {
701 va_start(args, fmt);
702 vaf.fmt = fmt;
703 vaf.va = &args;
704 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u, ",
705 sb->s_id, function, line, grp);
706 if (ino)
707 printk(KERN_CONT "inode %lu: ", ino);
708 if (block)
709 printk(KERN_CONT "block %llu:",
710 (unsigned long long) block);
711 printk(KERN_CONT "%pV\n", &vaf);
712 va_end(args);
713 }
5d1b1b3f
AK		 714
715 if (test_opt(sb, ERRORS_CONT)) {
e2d67052 716 ext4_commit_super(sb, 0);
5d1b1b3f
AK		 717 return;
718 }
1c13d5c0 719
5d1b1b3f
AK		 720 ext4_unlock_group(sb, grp);
721 ext4_handle_error(sb);
722 /*
723 * We only get here in the ERRORS_RO case; relocking the group
724 * may be dangerous, but nothing bad will happen since the
725 * filesystem will have already been marked read/only and the
726 * journal has been aborted. We return 1 as a hint to callers
727 * who might what to use the return value from
25985edc 728 * ext4_grp_locked_error() to distinguish between the
5d1b1b3f
AK		 729 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
730 * aggressively from the ext4 function in question, with a
731 * more appropriate error code.
732 */
733 ext4_lock_group(sb, grp);
734 return;
735}
736
617ba13b 737void ext4_update_dynamic_rev(struct super_block *sb)
ac27a0ec 738{
617ba13b 739 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
ac27a0ec 740
617ba13b 741 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
ac27a0ec
DK		 742 return;
743
12062ddd 744 ext4_warning(sb,
ac27a0ec
DK		 745 "updating to rev %d because of new feature flag, "
746 "running e2fsck is recommended",
617ba13b 747 EXT4_DYNAMIC_REV);
ac27a0ec 748
617ba13b
MC		 749 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
750 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
751 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
ac27a0ec
DK		 752 /* leave es->s_feature_*compat flags alone */
753 /* es->s_uuid will be set by e2fsck if empty */
754
755 /*
756 * The rest of the superblock fields should be zero, and if not it
757 * means they are likely already in use, so leave them alone. We
758 * can leave it up to e2fsck to clean up any inconsistencies there.
759 */
760}
761
762/*
763 * Open the external journal device
764 */
b31e1552 765static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb)
ac27a0ec
DK		 766{
767 struct block_device *bdev;
768 char b[BDEVNAME_SIZE];
769
d4d77629 770 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
ac27a0ec
DK		 771 if (IS_ERR(bdev))
772 goto fail;
773 return bdev;
774
775fail:
b31e1552 776 ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld",
ac27a0ec
DK		 777 __bdevname(dev, b), PTR_ERR(bdev));
778 return NULL;
779}
780
781/*
782 * Release the journal device
783 */
4385bab1 784static void ext4_blkdev_put(struct block_device *bdev)
ac27a0ec 785{
4385bab1 786 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
ac27a0ec
DK		 787}
788
4385bab1 789static void ext4_blkdev_remove(struct ext4_sb_info *sbi)
ac27a0ec
DK		 790{
791 struct block_device *bdev;
ac27a0ec
DK		 792 bdev = sbi->journal_bdev;
793 if (bdev) {
4385bab1 794 ext4_blkdev_put(bdev);
ac27a0ec
DK		 795 sbi->journal_bdev = NULL;
796 }
ac27a0ec
DK		 797}
798
799static inline struct inode *orphan_list_entry(struct list_head *l)
800{
617ba13b 801 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
ac27a0ec
DK		 802}
803
617ba13b 804static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
ac27a0ec
DK		 805{
806 struct list_head *l;
807
b31e1552
ES		 808 ext4_msg(sb, KERN_ERR, "sb orphan head is %d",
809 le32_to_cpu(sbi->s_es->s_last_orphan));
ac27a0ec
DK		 810
811 printk(KERN_ERR "sb_info orphan list:\n");
812 list_for_each(l, &sbi->s_orphan) {
813 struct inode *inode = orphan_list_entry(l);
814 printk(KERN_ERR " "
815 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
816 inode->i_sb->s_id, inode->i_ino, inode,
817 inode->i_mode, inode->i_nlink,
818 NEXT_ORPHAN(inode));
819 }
820}
821
2b2d6d01 822static void ext4_put_super(struct super_block *sb)
ac27a0ec 823{
617ba13b
MC		 824 struct ext4_sb_info *sbi = EXT4_SB(sb);
825 struct ext4_super_block *es = sbi->s_es;
ef2cabf7 826 int i, err;
ac27a0ec 827
857ac889 828 ext4_unregister_li_request(sb);
e0ccfd95
CH		 829 dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
830
2e8fa54e 831 flush_workqueue(sbi->rsv_conversion_wq);
2e8fa54e 832 destroy_workqueue(sbi->rsv_conversion_wq);
4c0425ff 833
0390131b
FM		 834 if (sbi->s_journal) {
835 err = jbd2_journal_destroy(sbi->s_journal);
836 sbi->s_journal = NULL;
837 if (err < 0)
c67d859e 838 ext4_abort(sb, "Couldn't clean up the journal");
0390131b 839 }
d4edac31 840
ebd173be 841 ext4_unregister_sysfs(sb);
d3922a77 842 ext4_es_unregister_shrinker(sbi);
9105bb14 843 del_timer_sync(&sbi->s_err_report);
d4edac31
JB		 844 ext4_release_system_zone(sb);
845 ext4_mb_release(sb);
846 ext4_ext_release(sb);
847 ext4_xattr_put_super(sb);
848
ac27a0ec 849 if (!(sb->s_flags & MS_RDONLY)) {
e2b911c5 850 ext4_clear_feature_journal_needs_recovery(sb);
ac27a0ec 851 es->s_state = cpu_to_le16(sbi->s_mount_state);
ac27a0ec 852 }
58c5873a 853 if (!(sb->s_flags & MS_RDONLY))
a8e25a83
AB		 854 ext4_commit_super(sb, 1);
855
ac27a0ec
DK		 856 for (i = 0; i < sbi->s_gdb_count; i++)
857 brelse(sbi->s_group_desc[i]);
b93b41d4
AV		 858 kvfree(sbi->s_group_desc);
859 kvfree(sbi->s_flex_groups);
57042651 860 percpu_counter_destroy(&sbi->s_freeclusters_counter);
ac27a0ec
DK		 861 percpu_counter_destroy(&sbi->s_freeinodes_counter);
862 percpu_counter_destroy(&sbi->s_dirs_counter);
57042651 863 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
ac27a0ec
DK		 864 brelse(sbi->s_sbh);
865#ifdef CONFIG_QUOTA
a2d4a646 866 for (i = 0; i < EXT4_MAXQUOTAS; i++)
ac27a0ec
DK		 867 kfree(sbi->s_qf_names[i]);
868#endif
869
870 /* Debugging code just in case the in-memory inode orphan list
871 * isn't empty. The on-disk one can be non-empty if we've
872 * detected an error and taken the fs readonly, but the
873 * in-memory list had better be clean by this point. */
874 if (!list_empty(&sbi->s_orphan))
875 dump_orphan_list(sb, sbi);
876 J_ASSERT(list_empty(&sbi->s_orphan));
877
89d96a6f 878 sync_blockdev(sb->s_bdev);
f98393a6 879 invalidate_bdev(sb->s_bdev);
ac27a0ec
DK		 880 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
881 /*
882 * Invalidate the journal device's buffers. We don't want them
883 * floating about in memory - the physical journal device may
884 * hotswapped, and it breaks the `ro-after' testing code.
885 */
886 sync_blockdev(sbi->journal_bdev);
f98393a6 887 invalidate_bdev(sbi->journal_bdev);
617ba13b 888 ext4_blkdev_remove(sbi);
ac27a0ec 889 }
9c191f70
M		 890 if (sbi->s_mb_cache) {
891 ext4_xattr_destroy_cache(sbi->s_mb_cache);
892 sbi->s_mb_cache = NULL;
893 }
c5e06d10
JL		 894 if (sbi->s_mmp_tsk)
895 kthread_stop(sbi->s_mmp_tsk);
ac27a0ec 896 sb->s_fs_info = NULL;
3197ebdb
TT		 897 /*
898 * Now that we are completely done shutting down the
899 * superblock, we need to actually destroy the kobject.
900 */
3197ebdb
TT		 901 kobject_put(&sbi->s_kobj);
902 wait_for_completion(&sbi->s_kobj_unregister);
0441984a
DW		 903 if (sbi->s_chksum_driver)
904 crypto_free_shash(sbi->s_chksum_driver);
705895b6 905 kfree(sbi->s_blockgroup_lock);
ac27a0ec 906 kfree(sbi);
ac27a0ec
DK		 907}
908
e18b890b 909static struct kmem_cache *ext4_inode_cachep;
ac27a0ec
DK		 910
911/*
912 * Called inside transaction, so use GFP_NOFS
913 */
617ba13b 914static struct inode *ext4_alloc_inode(struct super_block *sb)
ac27a0ec 915{
617ba13b 916 struct ext4_inode_info *ei;
ac27a0ec 917
e6b4f8da 918 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
ac27a0ec
DK		 919 if (!ei)
920 return NULL;
0b8e58a1 921
ac27a0ec 922 ei->vfs_inode.i_version = 1;
202ee5df 923 spin_lock_init(&ei->i_raw_lock);
c9de560d
AT		 924 INIT_LIST_HEAD(&ei->i_prealloc_list);
925 spin_lock_init(&ei->i_prealloc_lock);
9a26b661
ZL		 926 ext4_es_init_tree(&ei->i_es_tree);
927 rwlock_init(&ei->i_es_lock);
edaa53ca 928 INIT_LIST_HEAD(&ei->i_es_list);
eb68d0e2 929 ei->i_es_all_nr = 0;
edaa53ca 930 ei->i_es_shk_nr = 0;
dd475925 931 ei->i_es_shrink_lblk = 0;
d2a17637
MC		 932 ei->i_reserved_data_blocks = 0;
933 ei->i_reserved_meta_blocks = 0;
934 ei->i_allocated_meta_blocks = 0;
9d0be502 935 ei->i_da_metadata_calc_len = 0;
7e731bc9 936 ei->i_da_metadata_calc_last_lblock = 0;
d2a17637 937 spin_lock_init(&(ei->i_block_reservation_lock));
a9e7f447
DM		 938#ifdef CONFIG_QUOTA
939 ei->i_reserved_quota = 0;
96c7e0d9 940 memset(&ei->i_dquot, 0, sizeof(ei->i_dquot));
a9e7f447 941#endif
8aefcd55 942 ei->jinode = NULL;
2e8fa54e 943 INIT_LIST_HEAD(&ei->i_rsv_conversion_list);
744692dc 944 spin_lock_init(&ei->i_completed_io_lock);
b436b9be
JK		 945 ei->i_sync_tid = 0;
946 ei->i_datasync_tid = 0;
f7ad6d2e 947 atomic_set(&ei->i_ioend_count, 0);
e27f41e1 948 atomic_set(&ei->i_unwritten, 0);
2e8fa54e 949 INIT_WORK(&ei->i_rsv_conversion_work, ext4_end_io_rsv_work);
b30ab0e0 950#ifdef CONFIG_EXT4_FS_ENCRYPTION
b7236e21 951 ei->i_crypt_info = NULL;
b30ab0e0 952#endif
ac27a0ec
DK		 953 return &ei->vfs_inode;
954}
955
7ff9c073
TT		 956static int ext4_drop_inode(struct inode *inode)
957{
958 int drop = generic_drop_inode(inode);
959
960 trace_ext4_drop_inode(inode, drop);
961 return drop;
962}
963
fa0d7e3d
NP		 964static void ext4_i_callback(struct rcu_head *head)
965{
966 struct inode *inode = container_of(head, struct inode, i_rcu);
fa0d7e3d
NP		 967 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
968}
969
617ba13b 970static void ext4_destroy_inode(struct inode *inode)
ac27a0ec 971{
9f7dd93d 972 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
b31e1552
ES		 973 ext4_msg(inode->i_sb, KERN_ERR,
974 "Inode %lu (%p): orphan list check failed!",
975 inode->i_ino, EXT4_I(inode));
9f7dd93d
VA		 976 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
977 EXT4_I(inode), sizeof(struct ext4_inode_info),
978 true);
979 dump_stack();
980 }
fa0d7e3d 981 call_rcu(&inode->i_rcu, ext4_i_callback);
ac27a0ec
DK		 982}
983
51cc5068 984static void init_once(void *foo)
ac27a0ec 985{
617ba13b 986 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
ac27a0ec 987
a35afb83 988 INIT_LIST_HEAD(&ei->i_orphan);
a35afb83 989 init_rwsem(&ei->xattr_sem);
0e855ac8 990 init_rwsem(&ei->i_data_sem);
ea3d7209 991 init_rwsem(&ei->i_mmap_sem);
a35afb83 992 inode_init_once(&ei->vfs_inode);
ac27a0ec
DK		 993}
994
e67bc2b3 995static int __init init_inodecache(void)
ac27a0ec 996{
617ba13b
MC		 997 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
998 sizeof(struct ext4_inode_info),
ac27a0ec 999 0, (SLAB_RECLAIM_ACCOUNT|
5d097056 1000 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
20c2df83 1001 init_once);
617ba13b 1002 if (ext4_inode_cachep == NULL)
ac27a0ec
DK		 1003 return -ENOMEM;
1004 return 0;
1005}
1006
1007static void destroy_inodecache(void)
1008{
8c0a8537
KS		 1009 /*
1010 * Make sure all delayed rcu free inodes are flushed before we
1011 * destroy cache.
1012 */
1013 rcu_barrier();
617ba13b 1014 kmem_cache_destroy(ext4_inode_cachep);
ac27a0ec
DK		 1015}
1016
0930fcc1 1017void ext4_clear_inode(struct inode *inode)
ac27a0ec 1018{
0930fcc1 1019 invalidate_inode_buffers(inode);
dbd5768f 1020 clear_inode(inode);
9f754758 1021 dquot_drop(inode);
c2ea3fde 1022 ext4_discard_preallocations(inode);
51865fda 1023 ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS);
8aefcd55
TT		 1024 if (EXT4_I(inode)->jinode) {
1025 jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode),
1026 EXT4_I(inode)->jinode);
1027 jbd2_free_inode(EXT4_I(inode)->jinode);
1028 EXT4_I(inode)->jinode = NULL;
1029 }
b7236e21
TT		 1030#ifdef CONFIG_EXT4_FS_ENCRYPTION
1031 if (EXT4_I(inode)->i_crypt_info)
c936e1ec 1032 ext4_free_encryption_info(inode, EXT4_I(inode)->i_crypt_info);
b7236e21 1033#endif
ac27a0ec
DK		 1034}
1035
1b961ac0 1036static struct inode *ext4_nfs_get_inode(struct super_block *sb,
0b8e58a1 1037 u64 ino, u32 generation)
ac27a0ec 1038{
ac27a0ec 1039 struct inode *inode;
ac27a0ec 1040
617ba13b 1041 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
ac27a0ec 1042 return ERR_PTR(-ESTALE);
617ba13b 1043 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
ac27a0ec
DK		 1044 return ERR_PTR(-ESTALE);
1045
1046 /* iget isn't really right if the inode is currently unallocated!!
1047 *
617ba13b 1048 * ext4_read_inode will return a bad_inode if the inode had been
ac27a0ec
DK		 1049 * deleted, so we should be safe.
1050 *
1051 * Currently we don't know the generation for parent directory, so
1052 * a generation of 0 means "accept any"
1053 */
f4bb2981 1054 inode = ext4_iget_normal(sb, ino);
1d1fe1ee
DH		 1055 if (IS_ERR(inode))
1056 return ERR_CAST(inode);
1057 if (generation && inode->i_generation != generation) {
ac27a0ec
DK		 1058 iput(inode);
1059 return ERR_PTR(-ESTALE);
1060 }
1b961ac0
CH		 1061
1062 return inode;
1063}
1064
1065static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
0b8e58a1 1066 int fh_len, int fh_type)
1b961ac0
CH		 1067{
1068 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
1069 ext4_nfs_get_inode);
1070}
1071
1072static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
0b8e58a1 1073 int fh_len, int fh_type)
1b961ac0
CH		 1074{
1075 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
1076 ext4_nfs_get_inode);
ac27a0ec
DK		 1077}
1078
c39a7f84
TO		 1079/*
1080 * Try to release metadata pages (indirect blocks, directories) which are
1081 * mapped via the block device. Since these pages could have journal heads
1082 * which would prevent try_to_free_buffers() from freeing them, we must use
1083 * jbd2 layer's try_to_free_buffers() function to release them.
1084 */
0b8e58a1
AD		 1085static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
1086 gfp_t wait)
c39a7f84
TO		 1087{
1088 journal_t *journal = EXT4_SB(sb)->s_journal;
1089
1090 WARN_ON(PageChecked(page));
1091 if (!page_has_buffers(page))
1092 return 0;
1093 if (journal)
1094 return jbd2_journal_try_to_free_buffers(journal, page,
d0164adc 1095 wait & ~__GFP_DIRECT_RECLAIM);
c39a7f84
TO		 1096 return try_to_free_buffers(page);
1097}
1098
ac27a0ec 1099#ifdef CONFIG_QUOTA
689c958c
LX		 1100static char *quotatypes[] = INITQFNAMES;
1101#define QTYPE2NAME(t) (quotatypes[t])
ac27a0ec 1102
617ba13b
MC		 1103static int ext4_write_dquot(struct dquot *dquot);
1104static int ext4_acquire_dquot(struct dquot *dquot);
1105static int ext4_release_dquot(struct dquot *dquot);
1106static int ext4_mark_dquot_dirty(struct dquot *dquot);
1107static int ext4_write_info(struct super_block *sb, int type);
6f28e087 1108static int ext4_quota_on(struct super_block *sb, int type, int format_id,
f00c9e44 1109 struct path *path);
ca0e05e4 1110static int ext4_quota_off(struct super_block *sb, int type);
617ba13b
MC		 1111static int ext4_quota_on_mount(struct super_block *sb, int type);
1112static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec 1113 size_t len, loff_t off);
617ba13b 1114static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec 1115 const char *data, size_t len, loff_t off);
7c319d32
AK		 1116static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
1117 unsigned int flags);
1118static int ext4_enable_quotas(struct super_block *sb);
ac27a0ec 1119
96c7e0d9
JK		 1120static struct dquot **ext4_get_dquots(struct inode *inode)
1121{
1122 return EXT4_I(inode)->i_dquot;
1123}
1124
61e225dc 1125static const struct dquot_operations ext4_quota_operations = {
60e58e0f 1126 .get_reserved_space = ext4_get_reserved_space,
617ba13b
MC		 1127 .write_dquot = ext4_write_dquot,
1128 .acquire_dquot = ext4_acquire_dquot,
1129 .release_dquot = ext4_release_dquot,
1130 .mark_dirty = ext4_mark_dquot_dirty,
a5b5ee32
JK		 1131 .write_info = ext4_write_info,
1132 .alloc_dquot = dquot_alloc,
1133 .destroy_dquot = dquot_destroy,
040cb378 1134 .get_projid = ext4_get_projid,
ac27a0ec
DK		 1135};
1136
0d54b217 1137static const struct quotactl_ops ext4_qctl_operations = {
617ba13b 1138 .quota_on = ext4_quota_on,
ca0e05e4 1139 .quota_off = ext4_quota_off,
287a8095 1140 .quota_sync = dquot_quota_sync,
0a240339 1141 .get_state = dquot_get_state,
287a8095
CH		 1142 .set_info = dquot_set_dqinfo,
1143 .get_dqblk = dquot_get_dqblk,
1144 .set_dqblk = dquot_set_dqblk
ac27a0ec
DK		 1145};
1146#endif
1147
ee9b6d61 1148static const struct super_operations ext4_sops = {
617ba13b
MC		 1149 .alloc_inode = ext4_alloc_inode,
1150 .destroy_inode = ext4_destroy_inode,
617ba13b
MC		 1151 .write_inode = ext4_write_inode,
1152 .dirty_inode = ext4_dirty_inode,
7ff9c073 1153 .drop_inode = ext4_drop_inode,
0930fcc1 1154 .evict_inode = ext4_evict_inode,
617ba13b 1155 .put_super = ext4_put_super,
617ba13b 1156 .sync_fs = ext4_sync_fs,
c4be0c1d
TS		 1157 .freeze_fs = ext4_freeze,
1158 .unfreeze_fs = ext4_unfreeze,
617ba13b
MC		 1159 .statfs = ext4_statfs,
1160 .remount_fs = ext4_remount,
617ba13b 1161 .show_options = ext4_show_options,
ac27a0ec 1162#ifdef CONFIG_QUOTA
617ba13b
MC		 1163 .quota_read = ext4_quota_read,
1164 .quota_write = ext4_quota_write,
96c7e0d9 1165 .get_dquots = ext4_get_dquots,
ac27a0ec 1166#endif
c39a7f84 1167 .bdev_try_to_free_page = bdev_try_to_free_page,
ac27a0ec
DK		 1168};
1169
39655164 1170static const struct export_operations ext4_export_ops = {
1b961ac0
CH		 1171 .fh_to_dentry = ext4_fh_to_dentry,
1172 .fh_to_parent = ext4_fh_to_parent,
617ba13b 1173 .get_parent = ext4_get_parent,
ac27a0ec
DK		 1174};
1175
1176enum {
1177 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
1178 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
72578c33 1179 Opt_nouid32, Opt_debug, Opt_removed,
ac27a0ec 1180 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
72578c33 1181 Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload,
ad4eec61
ES		 1182 Opt_commit, Opt_min_batch_time, Opt_max_batch_time, Opt_journal_dev,
1183 Opt_journal_path, Opt_journal_checksum, Opt_journal_async_commit,
ac27a0ec 1184 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
6ddb2447 1185 Opt_data_err_abort, Opt_data_err_ignore, Opt_test_dummy_encryption,
ac27a0ec 1186 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
5a20bdfc 1187 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
ee4a3fcd 1188 Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err,
923ae0ff 1189 Opt_usrquota, Opt_grpquota, Opt_i_version, Opt_dax,
1449032b 1190 Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_mblk_io_submit,
a26f4992 1191 Opt_lazytime, Opt_nolazytime,
1449032b 1192 Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity,
5328e635 1193 Opt_inode_readahead_blks, Opt_journal_ioprio,
744692dc 1194 Opt_dioread_nolock, Opt_dioread_lock,
fc6cb1cd 1195 Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable,
c6d3d56d 1196 Opt_max_dir_size_kb, Opt_nojournal_checksum,
ac27a0ec
DK		 1197};
1198
a447c093 1199static const match_table_t tokens = {
ac27a0ec
DK		 1200 {Opt_bsd_df, "bsddf"},
1201 {Opt_minix_df, "minixdf"},
1202 {Opt_grpid, "grpid"},
1203 {Opt_grpid, "bsdgroups"},
1204 {Opt_nogrpid, "nogrpid"},
1205 {Opt_nogrpid, "sysvgroups"},
1206 {Opt_resgid, "resgid=%u"},
1207 {Opt_resuid, "resuid=%u"},
1208 {Opt_sb, "sb=%u"},
1209 {Opt_err_cont, "errors=continue"},
1210 {Opt_err_panic, "errors=panic"},
1211 {Opt_err_ro, "errors=remount-ro"},
1212 {Opt_nouid32, "nouid32"},
ac27a0ec 1213 {Opt_debug, "debug"},
72578c33
TT		 1214 {Opt_removed, "oldalloc"},
1215 {Opt_removed, "orlov"},
ac27a0ec
DK		 1216 {Opt_user_xattr, "user_xattr"},
1217 {Opt_nouser_xattr, "nouser_xattr"},
1218 {Opt_acl, "acl"},
1219 {Opt_noacl, "noacl"},
e3bb52ae 1220 {Opt_noload, "norecovery"},
5a916be1 1221 {Opt_noload, "noload"},
72578c33
TT		 1222 {Opt_removed, "nobh"},
1223 {Opt_removed, "bh"},
ac27a0ec 1224 {Opt_commit, "commit=%u"},
30773840
TT		 1225 {Opt_min_batch_time, "min_batch_time=%u"},
1226 {Opt_max_batch_time, "max_batch_time=%u"},
ac27a0ec 1227 {Opt_journal_dev, "journal_dev=%u"},
ad4eec61 1228 {Opt_journal_path, "journal_path=%s"},
818d276c 1229 {Opt_journal_checksum, "journal_checksum"},
c6d3d56d 1230 {Opt_nojournal_checksum, "nojournal_checksum"},
818d276c 1231 {Opt_journal_async_commit, "journal_async_commit"},
ac27a0ec
DK		 1232 {Opt_abort, "abort"},
1233 {Opt_data_journal, "data=journal"},
1234 {Opt_data_ordered, "data=ordered"},
1235 {Opt_data_writeback, "data=writeback"},
5bf5683a
HK		 1236 {Opt_data_err_abort, "data_err=abort"},
1237 {Opt_data_err_ignore, "data_err=ignore"},
ac27a0ec
DK		 1238 {Opt_offusrjquota, "usrjquota="},
1239 {Opt_usrjquota, "usrjquota=%s"},
1240 {Opt_offgrpjquota, "grpjquota="},
1241 {Opt_grpjquota, "grpjquota=%s"},
1242 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
1243 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
5a20bdfc 1244 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
ac27a0ec
DK		 1245 {Opt_grpquota, "grpquota"},
1246 {Opt_noquota, "noquota"},
1247 {Opt_quota, "quota"},
1248 {Opt_usrquota, "usrquota"},
1249 {Opt_barrier, "barrier=%u"},
06705bff
TT		 1250 {Opt_barrier, "barrier"},
1251 {Opt_nobarrier, "nobarrier"},
25ec56b5 1252 {Opt_i_version, "i_version"},
923ae0ff 1253 {Opt_dax, "dax"},
c9de560d 1254 {Opt_stripe, "stripe=%u"},
64769240 1255 {Opt_delalloc, "delalloc"},
a26f4992
TT		 1256 {Opt_lazytime, "lazytime"},
1257 {Opt_nolazytime, "nolazytime"},
dd919b98 1258 {Opt_nodelalloc, "nodelalloc"},
36ade451
JK		 1259 {Opt_removed, "mblk_io_submit"},
1260 {Opt_removed, "nomblk_io_submit"},
6fd058f7
TT		 1261 {Opt_block_validity, "block_validity"},
1262 {Opt_noblock_validity, "noblock_validity"},
240799cd 1263 {Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
b3881f74 1264 {Opt_journal_ioprio, "journal_ioprio=%u"},
afd4672d 1265 {Opt_auto_da_alloc, "auto_da_alloc=%u"},
06705bff
TT		 1266 {Opt_auto_da_alloc, "auto_da_alloc"},
1267 {Opt_noauto_da_alloc, "noauto_da_alloc"},
744692dc
JZ		 1268 {Opt_dioread_nolock, "dioread_nolock"},
1269 {Opt_dioread_lock, "dioread_lock"},
5328e635
ES		 1270 {Opt_discard, "discard"},
1271 {Opt_nodiscard, "nodiscard"},
fc6cb1cd
TT		 1272 {Opt_init_itable, "init_itable=%u"},
1273 {Opt_init_itable, "init_itable"},
1274 {Opt_noinit_itable, "noinit_itable"},
df981d03 1275 {Opt_max_dir_size_kb, "max_dir_size_kb=%u"},
6ddb2447 1276 {Opt_test_dummy_encryption, "test_dummy_encryption"},
c7198b9c
TT		 1277 {Opt_removed, "check=none"}, /* mount option from ext2/3 */
1278 {Opt_removed, "nocheck"}, /* mount option from ext2/3 */
1279 {Opt_removed, "reservation"}, /* mount option from ext2/3 */
1280 {Opt_removed, "noreservation"}, /* mount option from ext2/3 */
1281 {Opt_removed, "journal=%u"}, /* mount option from ext2/3 */
f3f12faa 1282 {Opt_err, NULL},
ac27a0ec
DK		 1283};
1284
617ba13b 1285static ext4_fsblk_t get_sb_block(void **data)
ac27a0ec 1286{
617ba13b 1287 ext4_fsblk_t sb_block;
ac27a0ec
DK		 1288 char *options = (char *) *data;
1289
1290 if (!options || strncmp(options, "sb=", 3) != 0)
1291 return 1; /* Default location */
0b8e58a1 1292
ac27a0ec 1293 options += 3;
0b8e58a1 1294 /* TODO: use simple_strtoll with >32bit ext4 */
ac27a0ec
DK		 1295 sb_block = simple_strtoul(options, &options, 0);
1296 if (*options && *options != ',') {
4776004f 1297 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
ac27a0ec
DK		 1298 (char *) *data);
1299 return 1;
1300 }
1301 if (*options == ',')
1302 options++;
1303 *data = (void *) options;
0b8e58a1 1304
ac27a0ec
DK		 1305 return sb_block;
1306}
1307
b3881f74 1308#define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
437ca0fd
DM		 1309static char deprecated_msg[] = "Mount option \"%s\" will be removed by %s\n"
1310 "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
b3881f74 1311
56c50f11
DM		 1312#ifdef CONFIG_QUOTA
1313static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
1314{
1315 struct ext4_sb_info *sbi = EXT4_SB(sb);
1316 char *qname;
03dafb5f 1317 int ret = -1;
56c50f11
DM		 1318
1319 if (sb_any_quota_loaded(sb) &&
1320 !sbi->s_qf_names[qtype]) {
1321 ext4_msg(sb, KERN_ERR,
1322 "Cannot change journaled "
1323 "quota options when quota turned on");
57f73c2c 1324 return -1;
56c50f11 1325 }
e2b911c5 1326 if (ext4_has_feature_quota(sb)) {
262b4662
JK		 1327 ext4_msg(sb, KERN_ERR, "Cannot set journaled quota options "
1328 "when QUOTA feature is enabled");
1329 return -1;
1330 }
56c50f11
DM		 1331 qname = match_strdup(args);
1332 if (!qname) {
1333 ext4_msg(sb, KERN_ERR,
1334 "Not enough memory for storing quotafile name");
57f73c2c 1335 return -1;
56c50f11 1336 }
03dafb5f
CG		 1337 if (sbi->s_qf_names[qtype]) {
1338 if (strcmp(sbi->s_qf_names[qtype], qname) == 0)
1339 ret = 1;
1340 else
1341 ext4_msg(sb, KERN_ERR,
1342 "%s quota file already specified",
1343 QTYPE2NAME(qtype));
1344 goto errout;
56c50f11 1345 }
03dafb5f 1346 if (strchr(qname, '/')) {
56c50f11
DM		 1347 ext4_msg(sb, KERN_ERR,
1348 "quotafile must be on filesystem root");
03dafb5f 1349 goto errout;
56c50f11 1350 }
03dafb5f 1351 sbi->s_qf_names[qtype] = qname;
fd8c37ec 1352 set_opt(sb, QUOTA);
56c50f11 1353 return 1;
03dafb5f
CG		 1354errout:
1355 kfree(qname);
1356 return ret;
56c50f11
DM		 1357}
1358
1359static int clear_qf_name(struct super_block *sb, int qtype)
1360{
1361
1362 struct ext4_sb_info *sbi = EXT4_SB(sb);
1363
1364 if (sb_any_quota_loaded(sb) &&
1365 sbi->s_qf_names[qtype]) {
1366 ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options"
1367 " when quota turned on");
57f73c2c 1368 return -1;
56c50f11 1369 }
03dafb5f 1370 kfree(sbi->s_qf_names[qtype]);
56c50f11
DM		 1371 sbi->s_qf_names[qtype] = NULL;
1372 return 1;
1373}
1374#endif
1375
26092bf5
TT		 1376#define MOPT_SET 0x0001
1377#define MOPT_CLEAR 0x0002
1378#define MOPT_NOSUPPORT 0x0004
1379#define MOPT_EXPLICIT 0x0008
1380#define MOPT_CLEAR_ERR 0x0010
1381#define MOPT_GTE0 0x0020
ac27a0ec 1382#ifdef CONFIG_QUOTA
26092bf5
TT		 1383#define MOPT_Q 0
1384#define MOPT_QFMT 0x0040
1385#else
1386#define MOPT_Q MOPT_NOSUPPORT
1387#define MOPT_QFMT MOPT_NOSUPPORT
ac27a0ec 1388#endif
26092bf5 1389#define MOPT_DATAJ 0x0080
8dc0aa8c
TT		 1390#define MOPT_NO_EXT2 0x0100
1391#define MOPT_NO_EXT3 0x0200
1392#define MOPT_EXT4_ONLY (MOPT_NO_EXT2 | MOPT_NO_EXT3)
ad4eec61 1393#define MOPT_STRING 0x0400
26092bf5
TT		 1394
1395static const struct mount_opts {
1396 int token;
1397 int mount_opt;
1398 int flags;
1399} ext4_mount_opts[] = {
1400 {Opt_minix_df, EXT4_MOUNT_MINIX_DF, MOPT_SET},
1401 {Opt_bsd_df, EXT4_MOUNT_MINIX_DF, MOPT_CLEAR},
1402 {Opt_grpid, EXT4_MOUNT_GRPID, MOPT_SET},
1403 {Opt_nogrpid, EXT4_MOUNT_GRPID, MOPT_CLEAR},
26092bf5
TT		 1404 {Opt_block_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_SET},
1405 {Opt_noblock_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_CLEAR},
8dc0aa8c
TT		 1406 {Opt_dioread_nolock, EXT4_MOUNT_DIOREAD_NOLOCK,
1407 MOPT_EXT4_ONLY | MOPT_SET},
1408 {Opt_dioread_lock, EXT4_MOUNT_DIOREAD_NOLOCK,
1409 MOPT_EXT4_ONLY | MOPT_CLEAR},
26092bf5
TT		 1410 {Opt_discard, EXT4_MOUNT_DISCARD, MOPT_SET},
1411 {Opt_nodiscard, EXT4_MOUNT_DISCARD, MOPT_CLEAR},
8dc0aa8c
TT		 1412 {Opt_delalloc, EXT4_MOUNT_DELALLOC,
1413 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
1414 {Opt_nodelalloc, EXT4_MOUNT_DELALLOC,
59d9fa5c 1415 MOPT_EXT4_ONLY | MOPT_CLEAR},
c6d3d56d
DW		 1416 {Opt_nojournal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
1417 MOPT_EXT4_ONLY | MOPT_CLEAR},
8dc0aa8c 1418 {Opt_journal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
1e381f60 1419 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
26092bf5 1420 {Opt_journal_async_commit, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT |
8dc0aa8c 1421 EXT4_MOUNT_JOURNAL_CHECKSUM),
1e381f60 1422 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
8dc0aa8c 1423 {Opt_noload, EXT4_MOUNT_NOLOAD, MOPT_NO_EXT2 | MOPT_SET},
26092bf5
TT		 1424 {Opt_err_panic, EXT4_MOUNT_ERRORS_PANIC, MOPT_SET | MOPT_CLEAR_ERR},
1425 {Opt_err_ro, EXT4_MOUNT_ERRORS_RO, MOPT_SET | MOPT_CLEAR_ERR},
1426 {Opt_err_cont, EXT4_MOUNT_ERRORS_CONT, MOPT_SET | MOPT_CLEAR_ERR},
8dc0aa8c
TT		 1427 {Opt_data_err_abort, EXT4_MOUNT_DATA_ERR_ABORT,
1428 MOPT_NO_EXT2 | MOPT_SET},
1429 {Opt_data_err_ignore, EXT4_MOUNT_DATA_ERR_ABORT,
1430 MOPT_NO_EXT2 | MOPT_CLEAR},
26092bf5
TT		 1431 {Opt_barrier, EXT4_MOUNT_BARRIER, MOPT_SET},
1432 {Opt_nobarrier, EXT4_MOUNT_BARRIER, MOPT_CLEAR},
1433 {Opt_noauto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_SET},
1434 {Opt_auto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_CLEAR},
1435 {Opt_noinit_itable, EXT4_MOUNT_INIT_INODE_TABLE, MOPT_CLEAR},
1436 {Opt_commit, 0, MOPT_GTE0},
1437 {Opt_max_batch_time, 0, MOPT_GTE0},
1438 {Opt_min_batch_time, 0, MOPT_GTE0},
1439 {Opt_inode_readahead_blks, 0, MOPT_GTE0},
1440 {Opt_init_itable, 0, MOPT_GTE0},
923ae0ff 1441 {Opt_dax, EXT4_MOUNT_DAX, MOPT_SET},
26092bf5 1442 {Opt_stripe, 0, MOPT_GTE0},
0efb3b23
JK		 1443 {Opt_resuid, 0, MOPT_GTE0},
1444 {Opt_resgid, 0, MOPT_GTE0},
5ba92bcf
CM		 1445 {Opt_journal_dev, 0, MOPT_NO_EXT2 | MOPT_GTE0},
1446 {Opt_journal_path, 0, MOPT_NO_EXT2 | MOPT_STRING},
1447 {Opt_journal_ioprio, 0, MOPT_NO_EXT2 | MOPT_GTE0},
8dc0aa8c
TT		 1448 {Opt_data_journal, EXT4_MOUNT_JOURNAL_DATA, MOPT_NO_EXT2 | MOPT_DATAJ},
1449 {Opt_data_ordered, EXT4_MOUNT_ORDERED_DATA, MOPT_NO_EXT2 | MOPT_DATAJ},
1450 {Opt_data_writeback, EXT4_MOUNT_WRITEBACK_DATA,
1451 MOPT_NO_EXT2 | MOPT_DATAJ},
26092bf5
TT		 1452 {Opt_user_xattr, EXT4_MOUNT_XATTR_USER, MOPT_SET},
1453 {Opt_nouser_xattr, EXT4_MOUNT_XATTR_USER, MOPT_CLEAR},
03010a33 1454#ifdef CONFIG_EXT4_FS_POSIX_ACL
26092bf5
TT		 1455 {Opt_acl, EXT4_MOUNT_POSIX_ACL, MOPT_SET},
1456 {Opt_noacl, EXT4_MOUNT_POSIX_ACL, MOPT_CLEAR},
ac27a0ec 1457#else
26092bf5
TT		 1458 {Opt_acl, 0, MOPT_NOSUPPORT},
1459 {Opt_noacl, 0, MOPT_NOSUPPORT},
ac27a0ec 1460#endif
26092bf5
TT		 1461 {Opt_nouid32, EXT4_MOUNT_NO_UID32, MOPT_SET},
1462 {Opt_debug, EXT4_MOUNT_DEBUG, MOPT_SET},
1463 {Opt_quota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA, MOPT_SET | MOPT_Q},
1464 {Opt_usrquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA,
1465 MOPT_SET | MOPT_Q},
1466 {Opt_grpquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_GRPQUOTA,
1467 MOPT_SET | MOPT_Q},
1468 {Opt_noquota, (EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA |
1469 EXT4_MOUNT_GRPQUOTA), MOPT_CLEAR | MOPT_Q},
1470 {Opt_usrjquota, 0, MOPT_Q},
1471 {Opt_grpjquota, 0, MOPT_Q},
1472 {Opt_offusrjquota, 0, MOPT_Q},
1473 {Opt_offgrpjquota, 0, MOPT_Q},
1474 {Opt_jqfmt_vfsold, QFMT_VFS_OLD, MOPT_QFMT},
1475 {Opt_jqfmt_vfsv0, QFMT_VFS_V0, MOPT_QFMT},
1476 {Opt_jqfmt_vfsv1, QFMT_VFS_V1, MOPT_QFMT},
df981d03 1477 {Opt_max_dir_size_kb, 0, MOPT_GTE0},
6ddb2447 1478 {Opt_test_dummy_encryption, 0, MOPT_GTE0},
26092bf5
TT		 1479 {Opt_err, 0, 0}
1480};
1481
1482static int handle_mount_opt(struct super_block *sb, char *opt, int token,
1483 substring_t *args, unsigned long *journal_devnum,
1484 unsigned int *journal_ioprio, int is_remount)
1485{
1486 struct ext4_sb_info *sbi = EXT4_SB(sb);
1487 const struct mount_opts *m;
08cefc7a
EB		 1488 kuid_t uid;
1489 kgid_t gid;
26092bf5
TT		 1490 int arg = 0;
1491
57f73c2c
TT		 1492#ifdef CONFIG_QUOTA
1493 if (token == Opt_usrjquota)
1494 return set_qf_name(sb, USRQUOTA, &args[0]);
1495 else if (token == Opt_grpjquota)
1496 return set_qf_name(sb, GRPQUOTA, &args[0]);
1497 else if (token == Opt_offusrjquota)
1498 return clear_qf_name(sb, USRQUOTA);
1499 else if (token == Opt_offgrpjquota)
1500 return clear_qf_name(sb, GRPQUOTA);
1501#endif
26092bf5 1502 switch (token) {
f7048605
TT		 1503 case Opt_noacl:
1504 case Opt_nouser_xattr:
1505 ext4_msg(sb, KERN_WARNING, deprecated_msg, opt, "3.5");
1506 break;
26092bf5
TT		 1507 case Opt_sb:
1508 return 1; /* handled by get_sb_block() */
1509 case Opt_removed:
5f3633e3 1510 ext4_msg(sb, KERN_WARNING, "Ignoring removed %s option", opt);
26092bf5 1511 return 1;
26092bf5
TT		 1512 case Opt_abort:
1513 sbi->s_mount_flags |= EXT4_MF_FS_ABORTED;
1514 return 1;
1515 case Opt_i_version:
1516 sb->s_flags |= MS_I_VERSION;
1517 return 1;
a26f4992
TT		 1518 case Opt_lazytime:
1519 sb->s_flags |= MS_LAZYTIME;
1520 return 1;
1521 case Opt_nolazytime:
1522 sb->s_flags &= ~MS_LAZYTIME;
1523 return 1;
26092bf5
TT		 1524 }
1525
5f3633e3
JK		 1526 for (m = ext4_mount_opts; m->token != Opt_err; m++)
1527 if (token == m->token)
1528 break;
1529
1530 if (m->token == Opt_err) {
1531 ext4_msg(sb, KERN_ERR, "Unrecognized mount option \"%s\" "
1532 "or missing value", opt);
1533 return -1;
1534 }
1535
8dc0aa8c
TT		 1536 if ((m->flags & MOPT_NO_EXT2) && IS_EXT2_SB(sb)) {
1537 ext4_msg(sb, KERN_ERR,
1538 "Mount option \"%s\" incompatible with ext2", opt);
1539 return -1;
1540 }
1541 if ((m->flags & MOPT_NO_EXT3) && IS_EXT3_SB(sb)) {
1542 ext4_msg(sb, KERN_ERR,
1543 "Mount option \"%s\" incompatible with ext3", opt);
1544 return -1;
1545 }
1546
ad4eec61 1547 if (args->from && !(m->flags & MOPT_STRING) && match_int(args, &arg))
5f3633e3
JK		 1548 return -1;
1549 if (args->from && (m->flags & MOPT_GTE0) && (arg < 0))
1550 return -1;
c93cf2d7
DM		 1551 if (m->flags & MOPT_EXPLICIT) {
1552 if (m->mount_opt & EXT4_MOUNT_DELALLOC) {
1553 set_opt2(sb, EXPLICIT_DELALLOC);
1e381f60
DM		 1554 } else if (m->mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) {
1555 set_opt2(sb, EXPLICIT_JOURNAL_CHECKSUM);
c93cf2d7
DM		 1556 } else
1557 return -1;
1558 }
5f3633e3
JK		 1559 if (m->flags & MOPT_CLEAR_ERR)
1560 clear_opt(sb, ERRORS_MASK);
1561 if (token == Opt_noquota && sb_any_quota_loaded(sb)) {
1562 ext4_msg(sb, KERN_ERR, "Cannot change quota "
1563 "options when quota turned on");
1564 return -1;
1565 }
1566
1567 if (m->flags & MOPT_NOSUPPORT) {
1568 ext4_msg(sb, KERN_ERR, "%s option not supported", opt);
1569 } else if (token == Opt_commit) {
1570 if (arg == 0)
1571 arg = JBD2_DEFAULT_MAX_COMMIT_AGE;
1572 sbi->s_commit_interval = HZ * arg;
1573 } else if (token == Opt_max_batch_time) {
5f3633e3
JK		 1574 sbi->s_max_batch_time = arg;
1575 } else if (token == Opt_min_batch_time) {
1576 sbi->s_min_batch_time = arg;
1577 } else if (token == Opt_inode_readahead_blks) {
e33e60ea
JK		 1578 if (arg && (arg > (1 << 30) || !is_power_of_2(arg))) {
1579 ext4_msg(sb, KERN_ERR,
1580 "EXT4-fs: inode_readahead_blks must be "
1581 "0 or a power of 2 smaller than 2^31");
26092bf5 1582 return -1;
5f3633e3
JK		 1583 }
1584 sbi->s_inode_readahead_blks = arg;
1585 } else if (token == Opt_init_itable) {
1586 set_opt(sb, INIT_INODE_TABLE);
1587 if (!args->from)
1588 arg = EXT4_DEF_LI_WAIT_MULT;
1589 sbi->s_li_wait_mult = arg;
1590 } else if (token == Opt_max_dir_size_kb) {
1591 sbi->s_max_dir_size_kb = arg;
1592 } else if (token == Opt_stripe) {
1593 sbi->s_stripe = arg;
1594 } else if (token == Opt_resuid) {
1595 uid = make_kuid(current_user_ns(), arg);
1596 if (!uid_valid(uid)) {
1597 ext4_msg(sb, KERN_ERR, "Invalid uid value %d", arg);
26092bf5
TT		 1598 return -1;
1599 }
5f3633e3
JK		 1600 sbi->s_resuid = uid;
1601 } else if (token == Opt_resgid) {
1602 gid = make_kgid(current_user_ns(), arg);
1603 if (!gid_valid(gid)) {
1604 ext4_msg(sb, KERN_ERR, "Invalid gid value %d", arg);
1605 return -1;
1606 }
1607 sbi->s_resgid = gid;
1608 } else if (token == Opt_journal_dev) {
1609 if (is_remount) {
1610 ext4_msg(sb, KERN_ERR,
1611 "Cannot specify journal on remount");
1612 return -1;
1613 }
1614 *journal_devnum = arg;
ad4eec61
ES		 1615 } else if (token == Opt_journal_path) {
1616 char *journal_path;
1617 struct inode *journal_inode;
1618 struct path path;
1619 int error;
1620
1621 if (is_remount) {
1622 ext4_msg(sb, KERN_ERR,
1623 "Cannot specify journal on remount");
1624 return -1;
1625 }
1626 journal_path = match_strdup(&args[0]);
1627 if (!journal_path) {
1628 ext4_msg(sb, KERN_ERR, "error: could not dup "
1629 "journal device string");
1630 return -1;
1631 }
1632
1633 error = kern_path(journal_path, LOOKUP_FOLLOW, &path);
1634 if (error) {
1635 ext4_msg(sb, KERN_ERR, "error: could not find "
1636 "journal device path: error %d", error);
1637 kfree(journal_path);
1638 return -1;
1639 }
1640
2b0143b5 1641 journal_inode = d_inode(path.dentry);
ad4eec61
ES		 1642 if (!S_ISBLK(journal_inode->i_mode)) {
1643 ext4_msg(sb, KERN_ERR, "error: journal path %s "
1644 "is not a block device", journal_path);
1645 path_put(&path);
1646 kfree(journal_path);
1647 return -1;
1648 }
1649
1650 *journal_devnum = new_encode_dev(journal_inode->i_rdev);
1651 path_put(&path);
1652 kfree(journal_path);
5f3633e3
JK		 1653 } else if (token == Opt_journal_ioprio) {
1654 if (arg > 7) {
1655 ext4_msg(sb, KERN_ERR, "Invalid journal IO priority"
1656 " (must be 0-7)");
1657 return -1;
1658 }
1659 *journal_ioprio =
1660 IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, arg);
6ddb2447
TT		 1661 } else if (token == Opt_test_dummy_encryption) {
1662#ifdef CONFIG_EXT4_FS_ENCRYPTION
1663 sbi->s_mount_flags |= EXT4_MF_TEST_DUMMY_ENCRYPTION;
1664 ext4_msg(sb, KERN_WARNING,
1665 "Test dummy encryption mode enabled");
1666#else
1667 ext4_msg(sb, KERN_WARNING,
1668 "Test dummy encryption mount option ignored");
1669#endif
5f3633e3
JK		 1670 } else if (m->flags & MOPT_DATAJ) {
1671 if (is_remount) {
1672 if (!sbi->s_journal)
1673 ext4_msg(sb, KERN_WARNING, "Remounting file system with no journal so ignoring journalled data option");
1674 else if (test_opt(sb, DATA_FLAGS) != m->mount_opt) {
0efb3b23 1675 ext4_msg(sb, KERN_ERR,
26092bf5 1676 "Cannot change data mode on remount");
26092bf5 1677 return -1;
ac27a0ec 1678 }
26092bf5 1679 } else {
5f3633e3
JK		 1680 clear_opt(sb, DATA_FLAGS);
1681 sbi->s_mount_opt |= m->mount_opt;
ac27a0ec 1682 }
5f3633e3
JK		 1683#ifdef CONFIG_QUOTA
1684 } else if (m->flags & MOPT_QFMT) {
1685 if (sb_any_quota_loaded(sb) &&
1686 sbi->s_jquota_fmt != m->mount_opt) {
1687 ext4_msg(sb, KERN_ERR, "Cannot change journaled "
1688 "quota options when quota turned on");
1689 return -1;
1690 }
e2b911c5 1691 if (ext4_has_feature_quota(sb)) {
262b4662
JK		 1692 ext4_msg(sb, KERN_ERR,
1693 "Cannot set journaled quota options "
1694 "when QUOTA feature is enabled");
1695 return -1;
1696 }
5f3633e3 1697 sbi->s_jquota_fmt = m->mount_opt;
923ae0ff 1698#endif
923ae0ff 1699 } else if (token == Opt_dax) {
ef83b6e8
DW		 1700#ifdef CONFIG_FS_DAX
1701 ext4_msg(sb, KERN_WARNING,
1702 "DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
1703 sbi->s_mount_opt |= m->mount_opt;
1704#else
923ae0ff
RZ		 1705 ext4_msg(sb, KERN_INFO, "dax option not supported");
1706 return -1;
5f3633e3
JK		 1707#endif
1708 } else {
1709 if (!args->from)
1710 arg = 1;
1711 if (m->flags & MOPT_CLEAR)
1712 arg = !arg;
1713 else if (unlikely(!(m->flags & MOPT_SET))) {
1714 ext4_msg(sb, KERN_WARNING,
1715 "buggy handling of option %s", opt);
1716 WARN_ON(1);
1717 return -1;
1718 }
1719 if (arg != 0)
1720 sbi->s_mount_opt |= m->mount_opt;
1721 else
1722 sbi->s_mount_opt &= ~m->mount_opt;
26092bf5 1723 }
5f3633e3 1724 return 1;
26092bf5
TT		 1725}
1726
1727static int parse_options(char *options, struct super_block *sb,
1728 unsigned long *journal_devnum,
1729 unsigned int *journal_ioprio,
1730 int is_remount)
1731{
1732 struct ext4_sb_info *sbi = EXT4_SB(sb);
1733 char *p;
1734 substring_t args[MAX_OPT_ARGS];
1735 int token;
1736
1737 if (!options)
1738 return 1;
1739
1740 while ((p = strsep(&options, ",")) != NULL) {
1741 if (!*p)
1742 continue;
1743 /*
1744 * Initialize args struct so we know whether arg was
1745 * found; some options take optional arguments.
1746 */
caecd0af 1747 args[0].to = args[0].from = NULL;
26092bf5
TT		 1748 token = match_token(p, tokens, args);
1749 if (handle_mount_opt(sb, p, token, args, journal_devnum,
1750 journal_ioprio, is_remount) < 0)
1751 return 0;
ac27a0ec
DK		 1752 }
1753#ifdef CONFIG_QUOTA
e2b911c5 1754 if (ext4_has_feature_quota(sb) &&
262b4662
JK		 1755 (test_opt(sb, USRQUOTA) || test_opt(sb, GRPQUOTA))) {
1756 ext4_msg(sb, KERN_ERR, "Cannot set quota options when QUOTA "
1757 "feature is enabled");
1758 return 0;
1759 }
ac27a0ec 1760 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
482a7425 1761 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
fd8c37ec 1762 clear_opt(sb, USRQUOTA);
ac27a0ec 1763
482a7425 1764 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
fd8c37ec 1765 clear_opt(sb, GRPQUOTA);
ac27a0ec 1766
56c50f11 1767 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
b31e1552
ES		 1768 ext4_msg(sb, KERN_ERR, "old and new quota "
1769 "format mixing");
ac27a0ec
DK		 1770 return 0;
1771 }
1772
1773 if (!sbi->s_jquota_fmt) {
b31e1552
ES		 1774 ext4_msg(sb, KERN_ERR, "journaled quota format "
1775 "not specified");
ac27a0ec
DK		 1776 return 0;
1777 }
ac27a0ec
DK		 1778 }
1779#endif
261cb20c
JK		 1780 if (test_opt(sb, DIOREAD_NOLOCK)) {
1781 int blocksize =
1782 BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);
1783
1784 if (blocksize < PAGE_CACHE_SIZE) {
1785 ext4_msg(sb, KERN_ERR, "can't mount with "
1786 "dioread_nolock if block size != PAGE_SIZE");
1787 return 0;
1788 }
1789 }
d4f76107
JK		 1790 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA &&
1791 test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
1792 ext4_msg(sb, KERN_ERR, "can't mount with journal_async_commit "
1793 "in data=ordered mode");
1794 return 0;
1795 }
ac27a0ec
DK		 1796 return 1;
1797}
1798
2adf6da8
TT		 1799static inline void ext4_show_quota_options(struct seq_file *seq,
1800 struct super_block *sb)
1801{
1802#if defined(CONFIG_QUOTA)
1803 struct ext4_sb_info *sbi = EXT4_SB(sb);
1804
1805 if (sbi->s_jquota_fmt) {
1806 char *fmtname = "";
1807
1808 switch (sbi->s_jquota_fmt) {
1809 case QFMT_VFS_OLD:
1810 fmtname = "vfsold";
1811 break;
1812 case QFMT_VFS_V0:
1813 fmtname = "vfsv0";
1814 break;
1815 case QFMT_VFS_V1:
1816 fmtname = "vfsv1";
1817 break;
1818 }
1819 seq_printf(seq, ",jqfmt=%s", fmtname);
1820 }
1821
1822 if (sbi->s_qf_names[USRQUOTA])
a068acf2 1823 seq_show_option(seq, "usrjquota", sbi->s_qf_names[USRQUOTA]);
2adf6da8
TT		 1824
1825 if (sbi->s_qf_names[GRPQUOTA])
a068acf2 1826 seq_show_option(seq, "grpjquota", sbi->s_qf_names[GRPQUOTA]);
2adf6da8
TT		 1827#endif
1828}
1829
5a916be1
TT		 1830static const char *token2str(int token)
1831{
50df9fd5 1832 const struct match_token *t;
5a916be1
TT		 1833
1834 for (t = tokens; t->token != Opt_err; t++)
1835 if (t->token == token && !strchr(t->pattern, '='))
1836 break;
1837 return t->pattern;
1838}
1839
2adf6da8
TT		 1840/*
1841 * Show an option if
1842 * - it's set to a non-default value OR
1843 * - if the per-sb default is different from the global default
1844 */
66acdcf4
TT		 1845static int _ext4_show_options(struct seq_file *seq, struct super_block *sb,
1846 int nodefs)
2adf6da8 1847{
2adf6da8
TT		 1848 struct ext4_sb_info *sbi = EXT4_SB(sb);
1849 struct ext4_super_block *es = sbi->s_es;
66acdcf4 1850 int def_errors, def_mount_opt = nodefs ? 0 : sbi->s_def_mount_opt;
5a916be1 1851 const struct mount_opts *m;
66acdcf4 1852 char sep = nodefs ? '\n' : ',';
2adf6da8 1853
66acdcf4
TT		 1854#define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep)
1855#define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg)
2adf6da8
TT		 1856
1857 if (sbi->s_sb_block != 1)
5a916be1
TT		 1858 SEQ_OPTS_PRINT("sb=%llu", sbi->s_sb_block);
1859
1860 for (m = ext4_mount_opts; m->token != Opt_err; m++) {
1861 int want_set = m->flags & MOPT_SET;
1862 if (((m->flags & (MOPT_SET|MOPT_CLEAR)) == 0) ||
1863 (m->flags & MOPT_CLEAR_ERR))
1864 continue;
66acdcf4 1865 if (!(m->mount_opt & (sbi->s_mount_opt ^ def_mount_opt)))
5a916be1
TT		 1866 continue; /* skip if same as the default */
1867 if ((want_set &&
1868 (sbi->s_mount_opt & m->mount_opt) != m->mount_opt) ||
1869 (!want_set && (sbi->s_mount_opt & m->mount_opt)))
1870 continue; /* select Opt_noFoo vs Opt_Foo */
1871 SEQ_OPTS_PRINT("%s", token2str(m->token));
2adf6da8 1872 }
5a916be1 1873
08cefc7a 1874 if (nodefs || !uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT4_DEF_RESUID)) ||
5a916be1 1875 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID)
08cefc7a
EB		 1876 SEQ_OPTS_PRINT("resuid=%u",
1877 from_kuid_munged(&init_user_ns, sbi->s_resuid));
1878 if (nodefs || !gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT4_DEF_RESGID)) ||
5a916be1 1879 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID)
08cefc7a
EB		 1880 SEQ_OPTS_PRINT("resgid=%u",
1881 from_kgid_munged(&init_user_ns, sbi->s_resgid));
66acdcf4 1882 def_errors = nodefs ? -1 : le16_to_cpu(es->s_errors);
5a916be1
TT		 1883 if (test_opt(sb, ERRORS_RO) && def_errors != EXT4_ERRORS_RO)
1884 SEQ_OPTS_PUTS("errors=remount-ro");
2adf6da8 1885 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
5a916be1 1886 SEQ_OPTS_PUTS("errors=continue");
2adf6da8 1887 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
5a916be1 1888 SEQ_OPTS_PUTS("errors=panic");
66acdcf4 1889 if (nodefs || sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ)
5a916be1 1890 SEQ_OPTS_PRINT("commit=%lu", sbi->s_commit_interval / HZ);
66acdcf4 1891 if (nodefs || sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME)
5a916be1 1892 SEQ_OPTS_PRINT("min_batch_time=%u", sbi->s_min_batch_time);
66acdcf4 1893 if (nodefs || sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME)
5a916be1 1894 SEQ_OPTS_PRINT("max_batch_time=%u", sbi->s_max_batch_time);
2adf6da8 1895 if (sb->s_flags & MS_I_VERSION)
5a916be1 1896 SEQ_OPTS_PUTS("i_version");
66acdcf4 1897 if (nodefs || sbi->s_stripe)
5a916be1 1898 SEQ_OPTS_PRINT("stripe=%lu", sbi->s_stripe);
66acdcf4 1899 if (EXT4_MOUNT_DATA_FLAGS & (sbi->s_mount_opt ^ def_mount_opt)) {
5a916be1
TT		 1900 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
1901 SEQ_OPTS_PUTS("data=journal");
1902 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
1903 SEQ_OPTS_PUTS("data=ordered");
1904 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
1905 SEQ_OPTS_PUTS("data=writeback");
1906 }
66acdcf4
TT		 1907 if (nodefs ||
1908 sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
5a916be1
TT		 1909 SEQ_OPTS_PRINT("inode_readahead_blks=%u",
1910 sbi->s_inode_readahead_blks);
2adf6da8 1911
66acdcf4
TT		 1912 if (nodefs || (test_opt(sb, INIT_INODE_TABLE) &&
1913 (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT)))
5a916be1 1914 SEQ_OPTS_PRINT("init_itable=%u", sbi->s_li_wait_mult);
df981d03
TT		 1915 if (nodefs || sbi->s_max_dir_size_kb)
1916 SEQ_OPTS_PRINT("max_dir_size_kb=%u", sbi->s_max_dir_size_kb);
2adf6da8
TT		 1917
1918 ext4_show_quota_options(seq, sb);
2adf6da8
TT		 1919 return 0;
1920}
1921
66acdcf4
TT		 1922static int ext4_show_options(struct seq_file *seq, struct dentry *root)
1923{
1924 return _ext4_show_options(seq, root->d_sb, 0);
1925}
1926
ebd173be 1927int ext4_seq_options_show(struct seq_file *seq, void *offset)
66acdcf4
TT		 1928{
1929 struct super_block *sb = seq->private;
1930 int rc;
1931
1932 seq_puts(seq, (sb->s_flags & MS_RDONLY) ? "ro" : "rw");
1933 rc = _ext4_show_options(seq, sb, 1);
1934 seq_puts(seq, "\n");
1935 return rc;
1936}
1937
617ba13b 1938static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
ac27a0ec
DK		 1939 int read_only)
1940{
617ba13b 1941 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec
DK		 1942 int res = 0;
1943
617ba13b 1944 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
b31e1552
ES		 1945 ext4_msg(sb, KERN_ERR, "revision level too high, "
1946 "forcing read-only mode");
ac27a0ec
DK		 1947 res = MS_RDONLY;
1948 }
1949 if (read_only)
281b5995 1950 goto done;
617ba13b 1951 if (!(sbi->s_mount_state & EXT4_VALID_FS))
b31e1552
ES		 1952 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
1953 "running e2fsck is recommended");
c8b459f4 1954 else if (sbi->s_mount_state & EXT4_ERROR_FS)
b31e1552
ES		 1955 ext4_msg(sb, KERN_WARNING,
1956 "warning: mounting fs with errors, "
1957 "running e2fsck is recommended");
ed3ce80a 1958 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
ac27a0ec
DK		 1959 le16_to_cpu(es->s_mnt_count) >=
1960 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
b31e1552
ES		 1961 ext4_msg(sb, KERN_WARNING,
1962 "warning: maximal mount count reached, "
1963 "running e2fsck is recommended");
ac27a0ec
DK		 1964 else if (le32_to_cpu(es->s_checkinterval) &&
1965 (le32_to_cpu(es->s_lastcheck) +
1966 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
b31e1552
ES		 1967 ext4_msg(sb, KERN_WARNING,
1968 "warning: checktime reached, "
1969 "running e2fsck is recommended");
0b8e58a1 1970 if (!sbi->s_journal)
0390131b 1971 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
ac27a0ec 1972 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
617ba13b 1973 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
e8546d06 1974 le16_add_cpu(&es->s_mnt_count, 1);
ac27a0ec 1975 es->s_mtime = cpu_to_le32(get_seconds());
617ba13b 1976 ext4_update_dynamic_rev(sb);
0390131b 1977 if (sbi->s_journal)
e2b911c5 1978 ext4_set_feature_journal_needs_recovery(sb);
ac27a0ec 1979
e2d67052 1980 ext4_commit_super(sb, 1);
281b5995 1981done:
ac27a0ec 1982 if (test_opt(sb, DEBUG))
a9df9a49 1983 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
a2595b8a 1984 "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
ac27a0ec
DK		 1985 sb->s_blocksize,
1986 sbi->s_groups_count,
617ba13b
MC		 1987 EXT4_BLOCKS_PER_GROUP(sb),
1988 EXT4_INODES_PER_GROUP(sb),
a2595b8a 1989 sbi->s_mount_opt, sbi->s_mount_opt2);
ac27a0ec 1990
7abc52c2 1991 cleancache_init_fs(sb);
ac27a0ec
DK		 1992 return res;
1993}
1994
117fff10
TT		 1995int ext4_alloc_flex_bg_array(struct super_block *sb, ext4_group_t ngroup)
1996{
1997 struct ext4_sb_info *sbi = EXT4_SB(sb);
1998 struct flex_groups *new_groups;
1999 int size;
2000
2001 if (!sbi->s_log_groups_per_flex)
2002 return 0;
2003
2004 size = ext4_flex_group(sbi, ngroup - 1) + 1;
2005 if (size <= sbi->s_flex_groups_allocated)
2006 return 0;
2007
2008 size = roundup_pow_of_two(size * sizeof(struct flex_groups));
2009 new_groups = ext4_kvzalloc(size, GFP_KERNEL);
2010 if (!new_groups) {
2011 ext4_msg(sb, KERN_ERR, "not enough memory for %d flex groups",
2012 size / (int) sizeof(struct flex_groups));
2013 return -ENOMEM;
2014 }
2015
2016 if (sbi->s_flex_groups) {
2017 memcpy(new_groups, sbi->s_flex_groups,
2018 (sbi->s_flex_groups_allocated *
2019 sizeof(struct flex_groups)));
b93b41d4 2020 kvfree(sbi->s_flex_groups);
117fff10
TT		 2021 }
2022 sbi->s_flex_groups = new_groups;
2023 sbi->s_flex_groups_allocated = size / sizeof(struct flex_groups);
2024 return 0;
2025}
2026
772cb7c8
JS		 2027static int ext4_fill_flex_info(struct super_block *sb)
2028{
2029 struct ext4_sb_info *sbi = EXT4_SB(sb);
2030 struct ext4_group_desc *gdp = NULL;
772cb7c8 2031 ext4_group_t flex_group;
117fff10 2032 int i, err;
772cb7c8 2033
503358ae 2034 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
d50f2ab6 2035 if (sbi->s_log_groups_per_flex < 1 || sbi->s_log_groups_per_flex > 31) {
772cb7c8
JS		 2036 sbi->s_log_groups_per_flex = 0;
2037 return 1;
2038 }
2039
117fff10
TT		 2040 err = ext4_alloc_flex_bg_array(sb, sbi->s_groups_count);
2041 if (err)
9933fc0a 2042 goto failed;
772cb7c8 2043
772cb7c8 2044 for (i = 0; i < sbi->s_groups_count; i++) {
88b6edd1 2045 gdp = ext4_get_group_desc(sb, i, NULL);
772cb7c8
JS		 2046
2047 flex_group = ext4_flex_group(sbi, i);
7ad9bb65
TT		 2048 atomic_add(ext4_free_inodes_count(sb, gdp),
2049 &sbi->s_flex_groups[flex_group].free_inodes);
90ba983f
TT		 2050 atomic64_add(ext4_free_group_clusters(sb, gdp),
2051 &sbi->s_flex_groups[flex_group].free_clusters);
7ad9bb65
TT		 2052 atomic_add(ext4_used_dirs_count(sb, gdp),
2053 &sbi->s_flex_groups[flex_group].used_dirs);
772cb7c8
JS		 2054 }
2055
2056 return 1;
2057failed:
2058 return 0;
2059}
2060
e2b911c5 2061static __le16 ext4_group_desc_csum(struct super_block *sb, __u32 block_group,
feb0ab32 2062 struct ext4_group_desc *gdp)
717d50e4 2063{
feb0ab32 2064 int offset;
717d50e4 2065 __u16 crc = 0;
feb0ab32 2066 __le32 le_group = cpu_to_le32(block_group);
e2b911c5 2067 struct ext4_sb_info *sbi = EXT4_SB(sb);
717d50e4 2068
9aa5d32b 2069 if (ext4_has_metadata_csum(sbi->s_sb)) {
feb0ab32 2070 /* Use new metadata_csum algorithm */
d6a77105 2071 __le16 save_csum;
feb0ab32
DW		 2072 __u32 csum32;
2073
d6a77105 2074 save_csum = gdp->bg_checksum;
feb0ab32
DW		 2075 gdp->bg_checksum = 0;
2076 csum32 = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&le_group,
2077 sizeof(le_group));
2078 csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp,
2079 sbi->s_desc_size);
d6a77105 2080 gdp->bg_checksum = save_csum;
feb0ab32
DW		 2081
2082 crc = csum32 & 0xFFFF;
2083 goto out;
717d50e4
AD		 2084 }
2085
feb0ab32 2086 /* old crc16 code */
e2b911c5 2087 if (!ext4_has_feature_gdt_csum(sb))
813d32f9
DW		 2088 return 0;
2089
feb0ab32
DW		 2090 offset = offsetof(struct ext4_group_desc, bg_checksum);
2091
2092 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
2093 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
2094 crc = crc16(crc, (__u8 *)gdp, offset);
2095 offset += sizeof(gdp->bg_checksum); /* skip checksum */
2096 /* for checksum of struct ext4_group_desc do the rest...*/
e2b911c5 2097 if (ext4_has_feature_64bit(sb) &&
feb0ab32
DW		 2098 offset < le16_to_cpu(sbi->s_es->s_desc_size))
2099 crc = crc16(crc, (__u8 *)gdp + offset,
2100 le16_to_cpu(sbi->s_es->s_desc_size) -
2101 offset);
2102
2103out:
717d50e4
AD		 2104 return cpu_to_le16(crc);
2105}
2106
feb0ab32 2107int ext4_group_desc_csum_verify(struct super_block *sb, __u32 block_group,
717d50e4
AD		 2108 struct ext4_group_desc *gdp)
2109{
feb0ab32 2110 if (ext4_has_group_desc_csum(sb) &&
e2b911c5 2111 (gdp->bg_checksum != ext4_group_desc_csum(sb, block_group, gdp)))
717d50e4
AD		 2112 return 0;
2113
2114 return 1;
2115}
2116
feb0ab32
DW		 2117void ext4_group_desc_csum_set(struct super_block *sb, __u32 block_group,
2118 struct ext4_group_desc *gdp)
2119{
2120 if (!ext4_has_group_desc_csum(sb))
2121 return;
e2b911c5 2122 gdp->bg_checksum = ext4_group_desc_csum(sb, block_group, gdp);
feb0ab32
DW		 2123}
2124
ac27a0ec 2125/* Called at mount-time, super-block is locked */
bfff6873
LC		 2126static int ext4_check_descriptors(struct super_block *sb,
2127 ext4_group_t *first_not_zeroed)
ac27a0ec 2128{
617ba13b
MC		 2129 struct ext4_sb_info *sbi = EXT4_SB(sb);
2130 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
2131 ext4_fsblk_t last_block;
bd81d8ee
LV		 2132 ext4_fsblk_t block_bitmap;
2133 ext4_fsblk_t inode_bitmap;
2134 ext4_fsblk_t inode_table;
ce421581 2135 int flexbg_flag = 0;
bfff6873 2136 ext4_group_t i, grp = sbi->s_groups_count;
ac27a0ec 2137
e2b911c5 2138 if (ext4_has_feature_flex_bg(sb))
ce421581
JS		 2139 flexbg_flag = 1;
2140
af5bc92d 2141 ext4_debug("Checking group descriptors");
ac27a0ec 2142
197cd65a
AM		 2143 for (i = 0; i < sbi->s_groups_count; i++) {
2144 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
2145
ce421581 2146 if (i == sbi->s_groups_count - 1 || flexbg_flag)
bd81d8ee 2147 last_block = ext4_blocks_count(sbi->s_es) - 1;
ac27a0ec
DK		 2148 else
2149 last_block = first_block +
617ba13b 2150 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
ac27a0ec 2151
bfff6873
LC		 2152 if ((grp == sbi->s_groups_count) &&
2153 !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2154 grp = i;
2155
8fadc143 2156 block_bitmap = ext4_block_bitmap(sb, gdp);
2b2d6d01 2157 if (block_bitmap < first_block || block_bitmap > last_block) {
b31e1552 2158 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2159 "Block bitmap for group %u not in group "
b31e1552 2160 "(block %llu)!", i, block_bitmap);
ac27a0ec
DK		 2161 return 0;
2162 }
8fadc143 2163 inode_bitmap = ext4_inode_bitmap(sb, gdp);
2b2d6d01 2164 if (inode_bitmap < first_block || inode_bitmap > last_block) {
b31e1552 2165 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2166 "Inode bitmap for group %u not in group "
b31e1552 2167 "(block %llu)!", i, inode_bitmap);
ac27a0ec
DK		 2168 return 0;
2169 }
8fadc143 2170 inode_table = ext4_inode_table(sb, gdp);
bd81d8ee 2171 if (inode_table < first_block ||
2b2d6d01 2172 inode_table + sbi->s_itb_per_group - 1 > last_block) {
b31e1552 2173 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2174 "Inode table for group %u not in group "
b31e1552 2175 "(block %llu)!", i, inode_table);
ac27a0ec
DK		 2176 return 0;
2177 }
955ce5f5 2178 ext4_lock_group(sb, i);
feb0ab32 2179 if (!ext4_group_desc_csum_verify(sb, i, gdp)) {
b31e1552
ES		 2180 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2181 "Checksum for group %u failed (%u!=%u)",
e2b911c5 2182 i, le16_to_cpu(ext4_group_desc_csum(sb, i,
b31e1552 2183 gdp)), le16_to_cpu(gdp->bg_checksum));
7ee1ec4c 2184 if (!(sb->s_flags & MS_RDONLY)) {
955ce5f5 2185 ext4_unlock_group(sb, i);
8a266467 2186 return 0;
7ee1ec4c 2187 }
717d50e4 2188 }
955ce5f5 2189 ext4_unlock_group(sb, i);
ce421581
JS		 2190 if (!flexbg_flag)
2191 first_block += EXT4_BLOCKS_PER_GROUP(sb);
ac27a0ec 2192 }
bfff6873
LC		 2193 if (NULL != first_not_zeroed)
2194 *first_not_zeroed = grp;
ac27a0ec
DK		 2195 return 1;
2196}
2197
617ba13b 2198/* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
ac27a0ec
DK		 2199 * the superblock) which were deleted from all directories, but held open by
2200 * a process at the time of a crash. We walk the list and try to delete these
2201 * inodes at recovery time (only with a read-write filesystem).
2202 *
2203 * In order to keep the orphan inode chain consistent during traversal (in
2204 * case of crash during recovery), we link each inode into the superblock
2205 * orphan list_head and handle it the same way as an inode deletion during
2206 * normal operation (which journals the operations for us).
2207 *
2208 * We only do an iget() and an iput() on each inode, which is very safe if we
2209 * accidentally point at an in-use or already deleted inode. The worst that
2210 * can happen in this case is that we get a "bit already cleared" message from
617ba13b 2211 * ext4_free_inode(). The only reason we would point at a wrong inode is if
ac27a0ec
DK		 2212 * e2fsck was run on this filesystem, and it must have already done the orphan
2213 * inode cleanup for us, so we can safely abort without any further action.
2214 */
2b2d6d01
TT		 2215static void ext4_orphan_cleanup(struct super_block *sb,
2216 struct ext4_super_block *es)
ac27a0ec
DK		 2217{
2218 unsigned int s_flags = sb->s_flags;
2219 int nr_orphans = 0, nr_truncates = 0;
2220#ifdef CONFIG_QUOTA
2221 int i;
2222#endif
2223 if (!es->s_last_orphan) {
2224 jbd_debug(4, "no orphan inodes to clean up\n");
2225 return;
2226 }
2227
a8f48a95 2228 if (bdev_read_only(sb->s_bdev)) {
b31e1552
ES		 2229 ext4_msg(sb, KERN_ERR, "write access "
2230 "unavailable, skipping orphan cleanup");
a8f48a95
ES		 2231 return;
2232 }
2233
d39195c3
AG		 2234 /* Check if feature set would not allow a r/w mount */
2235 if (!ext4_feature_set_ok(sb, 0)) {
2236 ext4_msg(sb, KERN_INFO, "Skipping orphan cleanup due to "
2237 "unknown ROCOMPAT features");
2238 return;
2239 }
2240
617ba13b 2241 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
c25f9bc6
ES		 2242 /* don't clear list on RO mount w/ errors */
2243 if (es->s_last_orphan && !(s_flags & MS_RDONLY)) {
84474976 2244 ext4_msg(sb, KERN_INFO, "Errors on filesystem, "
ac27a0ec 2245 "clearing orphan list.\n");
c25f9bc6
ES		 2246 es->s_last_orphan = 0;
2247 }
ac27a0ec
DK		 2248 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2249 return;
2250 }
2251
2252 if (s_flags & MS_RDONLY) {
b31e1552 2253 ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
ac27a0ec
DK		 2254 sb->s_flags &= ~MS_RDONLY;
2255 }
2256#ifdef CONFIG_QUOTA
2257 /* Needed for iput() to work correctly and not trash data */
2258 sb->s_flags |= MS_ACTIVE;
2259 /* Turn on quotas so that they are updated correctly */
a2d4a646 2260 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
617ba13b
MC		 2261 if (EXT4_SB(sb)->s_qf_names[i]) {
2262 int ret = ext4_quota_on_mount(sb, i);
ac27a0ec 2263 if (ret < 0)
b31e1552
ES		 2264 ext4_msg(sb, KERN_ERR,
2265 "Cannot turn on journaled "
2266 "quota: error %d", ret);
ac27a0ec
DK		 2267 }
2268 }
2269#endif
2270
2271 while (es->s_last_orphan) {
2272 struct inode *inode;
2273
97bd42b9
JB		 2274 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
2275 if (IS_ERR(inode)) {
ac27a0ec
DK		 2276 es->s_last_orphan = 0;
2277 break;
2278 }
2279
617ba13b 2280 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
871a2931 2281 dquot_initialize(inode);
ac27a0ec 2282 if (inode->i_nlink) {
566370a2
PT		 2283 if (test_opt(sb, DEBUG))
2284 ext4_msg(sb, KERN_DEBUG,
2285 "%s: truncating inode %lu to %lld bytes",
2286 __func__, inode->i_ino, inode->i_size);
e5f8eab8 2287 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
ac27a0ec 2288 inode->i_ino, inode->i_size);
721e3eba 2289 mutex_lock(&inode->i_mutex);
55f252c9 2290 truncate_inode_pages(inode->i_mapping, inode->i_size);
617ba13b 2291 ext4_truncate(inode);
721e3eba 2292 mutex_unlock(&inode->i_mutex);
ac27a0ec
DK		 2293 nr_truncates++;
2294 } else {
566370a2
PT		 2295 if (test_opt(sb, DEBUG))
2296 ext4_msg(sb, KERN_DEBUG,
2297 "%s: deleting unreferenced inode %lu",
2298 __func__, inode->i_ino);
ac27a0ec
DK		 2299 jbd_debug(2, "deleting unreferenced inode %lu\n",
2300 inode->i_ino);
2301 nr_orphans++;
2302 }
2303 iput(inode); /* The delete magic happens here! */
2304 }
2305
2b2d6d01 2306#define PLURAL(x) (x), ((x) == 1) ? "" : "s"
ac27a0ec
DK		 2307
2308 if (nr_orphans)
b31e1552
ES		 2309 ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
2310 PLURAL(nr_orphans));
ac27a0ec 2311 if (nr_truncates)
b31e1552
ES		 2312 ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
2313 PLURAL(nr_truncates));
ac27a0ec
DK		 2314#ifdef CONFIG_QUOTA
2315 /* Turn quotas off */
a2d4a646 2316 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
ac27a0ec 2317 if (sb_dqopt(sb)->files[i])
287a8095 2318 dquot_quota_off(sb, i);
ac27a0ec
DK		 2319 }
2320#endif
2321 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
2322}
0b8e58a1 2323
cd2291a4
ES		 2324/*
2325 * Maximal extent format file size.
2326 * Resulting logical blkno at s_maxbytes must fit in our on-disk
2327 * extent format containers, within a sector_t, and within i_blocks
2328 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
2329 * so that won't be a limiting factor.
2330 *
f17722f9
LC		 2331 * However there is other limiting factor. We do store extents in the form
2332 * of starting block and length, hence the resulting length of the extent
2333 * covering maximum file size must fit into on-disk format containers as
2334 * well. Given that length is always by 1 unit bigger than max unit (because
2335 * we count 0 as well) we have to lower the s_maxbytes by one fs block.
2336 *
cd2291a4
ES		 2337 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
2338 */
f287a1a5 2339static loff_t ext4_max_size(int blkbits, int has_huge_files)
cd2291a4
ES		 2340{
2341 loff_t res;
2342 loff_t upper_limit = MAX_LFS_FILESIZE;
2343
2344 /* small i_blocks in vfs inode? */
f287a1a5 2345 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
cd2291a4 2346 /*
90c699a9 2347 * CONFIG_LBDAF is not enabled implies the inode
cd2291a4
ES		 2348 * i_block represent total blocks in 512 bytes
2349 * 32 == size of vfs inode i_blocks * 8
2350 */
2351 upper_limit = (1LL << 32) - 1;
2352
2353 /* total blocks in file system block size */
2354 upper_limit >>= (blkbits - 9);
2355 upper_limit <<= blkbits;
2356 }
2357
f17722f9
LC		 2358 /*
2359 * 32-bit extent-start container, ee_block. We lower the maxbytes
2360 * by one fs block, so ee_len can cover the extent of maximum file
2361 * size
2362 */
2363 res = (1LL << 32) - 1;
cd2291a4 2364 res <<= blkbits;
cd2291a4
ES		 2365
2366 /* Sanity check against vm- & vfs- imposed limits */
2367 if (res > upper_limit)
2368 res = upper_limit;
2369
2370 return res;
2371}
ac27a0ec 2372
ac27a0ec 2373/*
cd2291a4 2374 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
0fc1b451
AK		 2375 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2376 * We need to be 1 filesystem block less than the 2^48 sector limit.
ac27a0ec 2377 */
f287a1a5 2378static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
ac27a0ec 2379{
617ba13b 2380 loff_t res = EXT4_NDIR_BLOCKS;
0fc1b451
AK		 2381 int meta_blocks;
2382 loff_t upper_limit;
0b8e58a1
AD		 2383 /* This is calculated to be the largest file size for a dense, block
2384 * mapped file such that the file's total number of 512-byte sectors,
2385 * including data and all indirect blocks, does not exceed (2^48 - 1).
2386 *
2387 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2388 * number of 512-byte sectors of the file.
0fc1b451
AK		 2389 */
2390
f287a1a5 2391 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
0fc1b451 2392 /*
90c699a9 2393 * !has_huge_files or CONFIG_LBDAF not enabled implies that
0b8e58a1
AD		 2394 * the inode i_block field represents total file blocks in
2395 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
0fc1b451
AK		 2396 */
2397 upper_limit = (1LL << 32) - 1;
2398
2399 /* total blocks in file system block size */
2400 upper_limit >>= (bits - 9);
2401
2402 } else {
8180a562
AK		 2403 /*
2404 * We use 48 bit ext4_inode i_blocks
2405 * With EXT4_HUGE_FILE_FL set the i_blocks
2406 * represent total number of blocks in
2407 * file system block size
2408 */
0fc1b451
AK		 2409 upper_limit = (1LL << 48) - 1;
2410
0fc1b451
AK		 2411 }
2412
2413 /* indirect blocks */
2414 meta_blocks = 1;
2415 /* double indirect blocks */
2416 meta_blocks += 1 + (1LL << (bits-2));
2417 /* tripple indirect blocks */
2418 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
2419
2420 upper_limit -= meta_blocks;
2421 upper_limit <<= bits;
ac27a0ec
DK		 2422
2423 res += 1LL << (bits-2);
2424 res += 1LL << (2*(bits-2));
2425 res += 1LL << (3*(bits-2));
2426 res <<= bits;
2427 if (res > upper_limit)
2428 res = upper_limit;
0fc1b451
AK		 2429
2430 if (res > MAX_LFS_FILESIZE)
2431 res = MAX_LFS_FILESIZE;
2432
ac27a0ec
DK		 2433 return res;
2434}
2435
617ba13b 2436static ext4_fsblk_t descriptor_loc(struct super_block *sb,
0b8e58a1 2437 ext4_fsblk_t logical_sb_block, int nr)
ac27a0ec 2438{
617ba13b 2439 struct ext4_sb_info *sbi = EXT4_SB(sb);
fd2d4291 2440 ext4_group_t bg, first_meta_bg;
ac27a0ec
DK		 2441 int has_super = 0;
2442
2443 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
2444
e2b911c5 2445 if (!ext4_has_feature_meta_bg(sb) || nr < first_meta_bg)
70bbb3e0 2446 return logical_sb_block + nr + 1;
ac27a0ec 2447 bg = sbi->s_desc_per_block * nr;
617ba13b 2448 if (ext4_bg_has_super(sb, bg))
ac27a0ec 2449 has_super = 1;
0b8e58a1 2450
bd63f6b0
DW		 2451 /*
2452 * If we have a meta_bg fs with 1k blocks, group 0's GDT is at
2453 * block 2, not 1. If s_first_data_block == 0 (bigalloc is enabled
2454 * on modern mke2fs or blksize > 1k on older mke2fs) then we must
2455 * compensate.
2456 */
2457 if (sb->s_blocksize == 1024 && nr == 0 &&
2458 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block) == 0)
2459 has_super++;
2460
617ba13b 2461 return (has_super + ext4_group_first_block_no(sb, bg));
ac27a0ec
DK		 2462}
2463
c9de560d
AT		 2464/**
2465 * ext4_get_stripe_size: Get the stripe size.
2466 * @sbi: In memory super block info
2467 *
2468 * If we have specified it via mount option, then
2469 * use the mount option value. If the value specified at mount time is
2470 * greater than the blocks per group use the super block value.
2471 * If the super block value is greater than blocks per group return 0.
2472 * Allocator needs it be less than blocks per group.
2473 *
2474 */
2475static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
2476{
2477 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
2478 unsigned long stripe_width =
2479 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
3eb08658 2480 int ret;
c9de560d
AT		 2481
2482 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
3eb08658
DE		 2483 ret = sbi->s_stripe;
2484 else if (stripe_width <= sbi->s_blocks_per_group)
2485 ret = stripe_width;
2486 else if (stride <= sbi->s_blocks_per_group)
2487 ret = stride;
2488 else
2489 ret = 0;
c9de560d 2490
3eb08658
DE		 2491 /*
2492 * If the stripe width is 1, this makes no sense and
2493 * we set it to 0 to turn off stripe handling code.
2494 */
2495 if (ret <= 1)
2496 ret = 0;
c9de560d 2497
3eb08658 2498 return ret;
c9de560d 2499}
ac27a0ec 2500
a13fb1a4
ES		 2501/*
2502 * Check whether this filesystem can be mounted based on
2503 * the features present and the RDONLY/RDWR mount requested.
2504 * Returns 1 if this filesystem can be mounted as requested,
2505 * 0 if it cannot be.
2506 */
2507static int ext4_feature_set_ok(struct super_block *sb, int readonly)
2508{
e2b911c5 2509 if (ext4_has_unknown_ext4_incompat_features(sb)) {
a13fb1a4
ES		 2510 ext4_msg(sb, KERN_ERR,
2511 "Couldn't mount because of "
2512 "unsupported optional features (%x)",
2513 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
2514 ~EXT4_FEATURE_INCOMPAT_SUPP));
2515 return 0;
2516 }
2517
2518 if (readonly)
2519 return 1;
2520
e2b911c5 2521 if (ext4_has_feature_readonly(sb)) {
2cb5cc8b
DW		 2522 ext4_msg(sb, KERN_INFO, "filesystem is read-only");
2523 sb->s_flags |= MS_RDONLY;
2524 return 1;
2525 }
2526
a13fb1a4 2527 /* Check that feature set is OK for a read-write mount */
e2b911c5 2528 if (ext4_has_unknown_ext4_ro_compat_features(sb)) {
a13fb1a4
ES		 2529 ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of "
2530 "unsupported optional features (%x)",
2531 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
2532 ~EXT4_FEATURE_RO_COMPAT_SUPP));
2533 return 0;
2534 }
2535 /*
2536 * Large file size enabled file system can only be mounted
2537 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
2538 */
e2b911c5 2539 if (ext4_has_feature_huge_file(sb)) {
a13fb1a4
ES		 2540 if (sizeof(blkcnt_t) < sizeof(u64)) {
2541 ext4_msg(sb, KERN_ERR, "Filesystem with huge files "
2542 "cannot be mounted RDWR without "
2543 "CONFIG_LBDAF");
2544 return 0;
2545 }
2546 }
e2b911c5 2547 if (ext4_has_feature_bigalloc(sb) && !ext4_has_feature_extents(sb)) {
bab08ab9
TT		 2548 ext4_msg(sb, KERN_ERR,
2549 "Can't support bigalloc feature without "
2550 "extents feature\n");
2551 return 0;
2552 }
7c319d32
AK		 2553
2554#ifndef CONFIG_QUOTA
e2b911c5 2555 if (ext4_has_feature_quota(sb) && !readonly) {
7c319d32
AK		 2556 ext4_msg(sb, KERN_ERR,
2557 "Filesystem with quota feature cannot be mounted RDWR "
2558 "without CONFIG_QUOTA");
2559 return 0;
2560 }
689c958c
LX		 2561 if (ext4_has_feature_project(sb) && !readonly) {
2562 ext4_msg(sb, KERN_ERR,
2563 "Filesystem with project quota feature cannot be mounted RDWR "
2564 "without CONFIG_QUOTA");
2565 return 0;
2566 }
7c319d32 2567#endif /* CONFIG_QUOTA */
a13fb1a4
ES		 2568 return 1;
2569}
2570
66e61a9e
TT		 2571/*
2572 * This function is called once a day if we have errors logged
2573 * on the file system
2574 */
2575static void print_daily_error_info(unsigned long arg)
2576{
2577 struct super_block *sb = (struct super_block *) arg;
2578 struct ext4_sb_info *sbi;
2579 struct ext4_super_block *es;
2580
2581 sbi = EXT4_SB(sb);
2582 es = sbi->s_es;
2583
2584 if (es->s_error_count)
ae0f78de
TT		 2585 /* fsck newer than v1.41.13 is needed to clean this condition. */
2586 ext4_msg(sb, KERN_NOTICE, "error count since last fsck: %u",
66e61a9e
TT		 2587 le32_to_cpu(es->s_error_count));
2588 if (es->s_first_error_time) {
ae0f78de 2589 printk(KERN_NOTICE "EXT4-fs (%s): initial error at time %u: %.*s:%d",
66e61a9e
TT		 2590 sb->s_id, le32_to_cpu(es->s_first_error_time),
2591 (int) sizeof(es->s_first_error_func),
2592 es->s_first_error_func,
2593 le32_to_cpu(es->s_first_error_line));
2594 if (es->s_first_error_ino)
2595 printk(": inode %u",
2596 le32_to_cpu(es->s_first_error_ino));
2597 if (es->s_first_error_block)
2598 printk(": block %llu", (unsigned long long)
2599 le64_to_cpu(es->s_first_error_block));
2600 printk("\n");
2601 }
2602 if (es->s_last_error_time) {
ae0f78de 2603 printk(KERN_NOTICE "EXT4-fs (%s): last error at time %u: %.*s:%d",
66e61a9e
TT		 2604 sb->s_id, le32_to_cpu(es->s_last_error_time),
2605 (int) sizeof(es->s_last_error_func),
2606 es->s_last_error_func,
2607 le32_to_cpu(es->s_last_error_line));
2608 if (es->s_last_error_ino)
2609 printk(": inode %u",
2610 le32_to_cpu(es->s_last_error_ino));
2611 if (es->s_last_error_block)
2612 printk(": block %llu", (unsigned long long)
2613 le64_to_cpu(es->s_last_error_block));
2614 printk("\n");
2615 }
2616 mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ); /* Once a day */
2617}
2618
bfff6873
LC		 2619/* Find next suitable group and run ext4_init_inode_table */
2620static int ext4_run_li_request(struct ext4_li_request *elr)
2621{
2622 struct ext4_group_desc *gdp = NULL;
2623 ext4_group_t group, ngroups;
2624 struct super_block *sb;
2625 unsigned long timeout = 0;
2626 int ret = 0;
2627
2628 sb = elr->lr_super;
2629 ngroups = EXT4_SB(sb)->s_groups_count;
2630
8e8ad8a5 2631 sb_start_write(sb);
bfff6873
LC		 2632 for (group = elr->lr_next_group; group < ngroups; group++) {
2633 gdp = ext4_get_group_desc(sb, group, NULL);
2634 if (!gdp) {
2635 ret = 1;
2636 break;
2637 }
2638
2639 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2640 break;
2641 }
2642
7f511862 2643 if (group >= ngroups)
bfff6873
LC		 2644 ret = 1;
2645
2646 if (!ret) {
2647 timeout = jiffies;
2648 ret = ext4_init_inode_table(sb, group,
2649 elr->lr_timeout ? 0 : 1);
2650 if (elr->lr_timeout == 0) {
51ce6511
LC		 2651 timeout = (jiffies - timeout) *
2652 elr->lr_sbi->s_li_wait_mult;
bfff6873
LC		 2653 elr->lr_timeout = timeout;
2654 }
2655 elr->lr_next_sched = jiffies + elr->lr_timeout;
2656 elr->lr_next_group = group + 1;
2657 }
8e8ad8a5 2658 sb_end_write(sb);
bfff6873
LC		 2659
2660 return ret;
2661}
2662
2663/*
2664 * Remove lr_request from the list_request and free the
4ed5c033 2665 * request structure. Should be called with li_list_mtx held
bfff6873
LC		 2666 */
2667static void ext4_remove_li_request(struct ext4_li_request *elr)
2668{
2669 struct ext4_sb_info *sbi;
2670
2671 if (!elr)
2672 return;
2673
2674 sbi = elr->lr_sbi;
2675
2676 list_del(&elr->lr_request);
2677 sbi->s_li_request = NULL;
2678 kfree(elr);
2679}
2680
2681static void ext4_unregister_li_request(struct super_block *sb)
2682{
1bb933fb
LC		 2683 mutex_lock(&ext4_li_mtx);
2684 if (!ext4_li_info) {
2685 mutex_unlock(&ext4_li_mtx);
bfff6873 2686 return;
1bb933fb 2687 }
bfff6873
LC		 2688
2689 mutex_lock(&ext4_li_info->li_list_mtx);
1bb933fb 2690 ext4_remove_li_request(EXT4_SB(sb)->s_li_request);
bfff6873 2691 mutex_unlock(&ext4_li_info->li_list_mtx);
1bb933fb 2692 mutex_unlock(&ext4_li_mtx);
bfff6873
LC		 2693}
2694
8f1f7453
ES		 2695static struct task_struct *ext4_lazyinit_task;
2696
bfff6873
LC		 2697/*
2698 * This is the function where ext4lazyinit thread lives. It walks
2699 * through the request list searching for next scheduled filesystem.
2700 * When such a fs is found, run the lazy initialization request
2701 * (ext4_rn_li_request) and keep track of the time spend in this
2702 * function. Based on that time we compute next schedule time of
2703 * the request. When walking through the list is complete, compute
2704 * next waking time and put itself into sleep.
2705 */
2706static int ext4_lazyinit_thread(void *arg)
2707{
2708 struct ext4_lazy_init *eli = (struct ext4_lazy_init *)arg;
2709 struct list_head *pos, *n;
2710 struct ext4_li_request *elr;
4ed5c033 2711 unsigned long next_wakeup, cur;
bfff6873
LC		 2712
2713 BUG_ON(NULL == eli);
2714
bfff6873
LC		 2715cont_thread:
2716 while (true) {
2717 next_wakeup = MAX_JIFFY_OFFSET;
2718
2719 mutex_lock(&eli->li_list_mtx);
2720 if (list_empty(&eli->li_request_list)) {
2721 mutex_unlock(&eli->li_list_mtx);
2722 goto exit_thread;
2723 }
2724
2725 list_for_each_safe(pos, n, &eli->li_request_list) {
2726 elr = list_entry(pos, struct ext4_li_request,
2727 lr_request);
2728
b2c78cd0
TT		 2729 if (time_after_eq(jiffies, elr->lr_next_sched)) {
2730 if (ext4_run_li_request(elr) != 0) {
2731 /* error, remove the lazy_init job */
2732 ext4_remove_li_request(elr);
2733 continue;
2734 }
bfff6873
LC		 2735 }
2736
2737 if (time_before(elr->lr_next_sched, next_wakeup))
2738 next_wakeup = elr->lr_next_sched;
2739 }
2740 mutex_unlock(&eli->li_list_mtx);
2741
a0acae0e 2742 try_to_freeze();
bfff6873 2743
4ed5c033
LC		 2744 cur = jiffies;
2745 if ((time_after_eq(cur, next_wakeup)) ||
f4245bd4 2746 (MAX_JIFFY_OFFSET == next_wakeup)) {
bfff6873
LC		 2747 cond_resched();
2748 continue;
2749 }
2750
4ed5c033
LC		 2751 schedule_timeout_interruptible(next_wakeup - cur);
2752
8f1f7453
ES		 2753 if (kthread_should_stop()) {
2754 ext4_clear_request_list();
2755 goto exit_thread;
2756 }
bfff6873
LC		 2757 }
2758
2759exit_thread:
2760 /*
2761 * It looks like the request list is empty, but we need
2762 * to check it under the li_list_mtx lock, to prevent any
2763 * additions into it, and of course we should lock ext4_li_mtx
2764 * to atomically free the list and ext4_li_info, because at
2765 * this point another ext4 filesystem could be registering
2766 * new one.
2767 */
2768 mutex_lock(&ext4_li_mtx);
2769 mutex_lock(&eli->li_list_mtx);
2770 if (!list_empty(&eli->li_request_list)) {
2771 mutex_unlock(&eli->li_list_mtx);
2772 mutex_unlock(&ext4_li_mtx);
2773 goto cont_thread;
2774 }
2775 mutex_unlock(&eli->li_list_mtx);
bfff6873
LC		 2776 kfree(ext4_li_info);
2777 ext4_li_info = NULL;
2778 mutex_unlock(&ext4_li_mtx);
2779
2780 return 0;
2781}
2782
2783static void ext4_clear_request_list(void)
2784{
2785 struct list_head *pos, *n;
2786 struct ext4_li_request *elr;
2787
2788 mutex_lock(&ext4_li_info->li_list_mtx);
bfff6873
LC		 2789 list_for_each_safe(pos, n, &ext4_li_info->li_request_list) {
2790 elr = list_entry(pos, struct ext4_li_request,
2791 lr_request);
2792 ext4_remove_li_request(elr);
2793 }
2794 mutex_unlock(&ext4_li_info->li_list_mtx);
2795}
2796
2797static int ext4_run_lazyinit_thread(void)
2798{
8f1f7453
ES		 2799 ext4_lazyinit_task = kthread_run(ext4_lazyinit_thread,
2800 ext4_li_info, "ext4lazyinit");
2801 if (IS_ERR(ext4_lazyinit_task)) {
2802 int err = PTR_ERR(ext4_lazyinit_task);
bfff6873 2803 ext4_clear_request_list();
bfff6873
LC		 2804 kfree(ext4_li_info);
2805 ext4_li_info = NULL;
92b97816 2806 printk(KERN_CRIT "EXT4-fs: error %d creating inode table "
bfff6873
LC		 2807 "initialization thread\n",
2808 err);
2809 return err;
2810 }
2811 ext4_li_info->li_state |= EXT4_LAZYINIT_RUNNING;
bfff6873
LC		 2812 return 0;
2813}
2814
2815/*
2816 * Check whether it make sense to run itable init. thread or not.
2817 * If there is at least one uninitialized inode table, return
2818 * corresponding group number, else the loop goes through all
2819 * groups and return total number of groups.
2820 */
2821static ext4_group_t ext4_has_uninit_itable(struct super_block *sb)
2822{
2823 ext4_group_t group, ngroups = EXT4_SB(sb)->s_groups_count;
2824 struct ext4_group_desc *gdp = NULL;
2825
2826 for (group = 0; group < ngroups; group++) {
2827 gdp = ext4_get_group_desc(sb, group, NULL);
2828 if (!gdp)
2829 continue;
2830
2831 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2832 break;
2833 }
2834
2835 return group;
2836}
2837
2838static int ext4_li_info_new(void)
2839{
2840 struct ext4_lazy_init *eli = NULL;
2841
2842 eli = kzalloc(sizeof(*eli), GFP_KERNEL);
2843 if (!eli)
2844 return -ENOMEM;
2845
bfff6873
LC		 2846 INIT_LIST_HEAD(&eli->li_request_list);
2847 mutex_init(&eli->li_list_mtx);
2848
bfff6873
LC		 2849 eli->li_state |= EXT4_LAZYINIT_QUIT;
2850
2851 ext4_li_info = eli;
2852
2853 return 0;
2854}
2855
2856static struct ext4_li_request *ext4_li_request_new(struct super_block *sb,
2857 ext4_group_t start)
2858{
2859 struct ext4_sb_info *sbi = EXT4_SB(sb);
2860 struct ext4_li_request *elr;
bfff6873
LC		 2861
2862 elr = kzalloc(sizeof(*elr), GFP_KERNEL);
2863 if (!elr)
2864 return NULL;
2865
2866 elr->lr_super = sb;
2867 elr->lr_sbi = sbi;
2868 elr->lr_next_group = start;
2869
2870 /*
2871 * Randomize first schedule time of the request to
2872 * spread the inode table initialization requests
2873 * better.
2874 */
dd1f723b
TT		 2875 elr->lr_next_sched = jiffies + (prandom_u32() %
2876 (EXT4_DEF_LI_MAX_START_DELAY * HZ));
bfff6873
LC		 2877 return elr;
2878}
2879
7f511862
TT		 2880int ext4_register_li_request(struct super_block *sb,
2881 ext4_group_t first_not_zeroed)
bfff6873
LC		 2882{
2883 struct ext4_sb_info *sbi = EXT4_SB(sb);
7f511862 2884 struct ext4_li_request *elr = NULL;
bfff6873 2885 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
6c5a6cb9 2886 int ret = 0;
bfff6873 2887
7f511862 2888 mutex_lock(&ext4_li_mtx);
51ce6511
LC		 2889 if (sbi->s_li_request != NULL) {
2890 /*
2891 * Reset timeout so it can be computed again, because
2892 * s_li_wait_mult might have changed.
2893 */
2894 sbi->s_li_request->lr_timeout = 0;
7f511862 2895 goto out;
51ce6511 2896 }
bfff6873
LC		 2897
2898 if (first_not_zeroed == ngroups ||
2899 (sb->s_flags & MS_RDONLY) ||
55ff3840 2900 !test_opt(sb, INIT_INODE_TABLE))
7f511862 2901 goto out;
bfff6873
LC		 2902
2903 elr = ext4_li_request_new(sb, first_not_zeroed);
7f511862
TT		 2904 if (!elr) {
2905 ret = -ENOMEM;
2906 goto out;
2907 }
bfff6873
LC		 2908
2909 if (NULL == ext4_li_info) {
2910 ret = ext4_li_info_new();
2911 if (ret)
2912 goto out;
2913 }
2914
2915 mutex_lock(&ext4_li_info->li_list_mtx);
2916 list_add(&elr->lr_request, &ext4_li_info->li_request_list);
2917 mutex_unlock(&ext4_li_info->li_list_mtx);
2918
2919 sbi->s_li_request = elr;
46e4690b
TM		 2920 /*
2921 * set elr to NULL here since it has been inserted to
2922 * the request_list and the removal and free of it is
2923 * handled by ext4_clear_request_list from now on.
2924 */
2925 elr = NULL;
bfff6873
LC		 2926
2927 if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) {
2928 ret = ext4_run_lazyinit_thread();
2929 if (ret)
2930 goto out;
2931 }
bfff6873 2932out:
beed5ecb
NK		 2933 mutex_unlock(&ext4_li_mtx);
2934 if (ret)
bfff6873 2935 kfree(elr);
bfff6873
LC		 2936 return ret;
2937}
2938
2939/*
2940 * We do not need to lock anything since this is called on
2941 * module unload.
2942 */
2943static void ext4_destroy_lazyinit_thread(void)
2944{
2945 /*
2946 * If thread exited earlier
2947 * there's nothing to be done.
2948 */
8f1f7453 2949 if (!ext4_li_info || !ext4_lazyinit_task)
bfff6873
LC		 2950 return;
2951
8f1f7453 2952 kthread_stop(ext4_lazyinit_task);
bfff6873
LC		 2953}
2954
25ed6e8a
DW		 2955static int set_journal_csum_feature_set(struct super_block *sb)
2956{
2957 int ret = 1;
2958 int compat, incompat;
2959 struct ext4_sb_info *sbi = EXT4_SB(sb);
2960
9aa5d32b 2961 if (ext4_has_metadata_csum(sb)) {
db9ee220 2962 /* journal checksum v3 */
25ed6e8a 2963 compat = 0;
db9ee220 2964 incompat = JBD2_FEATURE_INCOMPAT_CSUM_V3;
25ed6e8a
DW		 2965 } else {
2966 /* journal checksum v1 */
2967 compat = JBD2_FEATURE_COMPAT_CHECKSUM;
2968 incompat = 0;
2969 }
2970
feb8c6d3
DW		 2971 jbd2_journal_clear_features(sbi->s_journal,
2972 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
2973 JBD2_FEATURE_INCOMPAT_CSUM_V3 |
2974 JBD2_FEATURE_INCOMPAT_CSUM_V2);
25ed6e8a
DW		 2975 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
2976 ret = jbd2_journal_set_features(sbi->s_journal,
2977 compat, 0,
2978 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT |
2979 incompat);
2980 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
2981 ret = jbd2_journal_set_features(sbi->s_journal,
2982 compat, 0,
2983 incompat);
2984 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
2985 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2986 } else {
feb8c6d3
DW		 2987 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
2988 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
25ed6e8a
DW		 2989 }
2990
2991 return ret;
2992}
2993
952fc18e
TT		 2994/*
2995 * Note: calculating the overhead so we can be compatible with
2996 * historical BSD practice is quite difficult in the face of
2997 * clusters/bigalloc. This is because multiple metadata blocks from
2998 * different block group can end up in the same allocation cluster.
2999 * Calculating the exact overhead in the face of clustered allocation
3000 * requires either O(all block bitmaps) in memory or O(number of block
3001 * groups**2) in time. We will still calculate the superblock for
3002 * older file systems --- and if we come across with a bigalloc file
3003 * system with zero in s_overhead_clusters the estimate will be close to
3004 * correct especially for very large cluster sizes --- but for newer
3005 * file systems, it's better to calculate this figure once at mkfs
3006 * time, and store it in the superblock. If the superblock value is
3007 * present (even for non-bigalloc file systems), we will use it.
3008 */
3009static int count_overhead(struct super_block *sb, ext4_group_t grp,
3010 char *buf)
3011{
3012 struct ext4_sb_info *sbi = EXT4_SB(sb);
3013 struct ext4_group_desc *gdp;
3014 ext4_fsblk_t first_block, last_block, b;
3015 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3016 int s, j, count = 0;
3017
e2b911c5 3018 if (!ext4_has_feature_bigalloc(sb))
0548bbb8
TT		 3019 return (ext4_bg_has_super(sb, grp) + ext4_bg_num_gdb(sb, grp) +
3020 sbi->s_itb_per_group + 2);
3021
952fc18e
TT		 3022 first_block = le32_to_cpu(sbi->s_es->s_first_data_block) +
3023 (grp * EXT4_BLOCKS_PER_GROUP(sb));
3024 last_block = first_block + EXT4_BLOCKS_PER_GROUP(sb) - 1;
3025 for (i = 0; i < ngroups; i++) {
3026 gdp = ext4_get_group_desc(sb, i, NULL);
3027 b = ext4_block_bitmap(sb, gdp);
3028 if (b >= first_block && b <= last_block) {
3029 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3030 count++;
3031 }
3032 b = ext4_inode_bitmap(sb, gdp);
3033 if (b >= first_block && b <= last_block) {
3034 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3035 count++;
3036 }
3037 b = ext4_inode_table(sb, gdp);
3038 if (b >= first_block && b + sbi->s_itb_per_group <= last_block)
3039 for (j = 0; j < sbi->s_itb_per_group; j++, b++) {
3040 int c = EXT4_B2C(sbi, b - first_block);
3041 ext4_set_bit(c, buf);
3042 count++;
3043 }
3044 if (i != grp)
3045 continue;
3046 s = 0;
3047 if (ext4_bg_has_super(sb, grp)) {
3048 ext4_set_bit(s++, buf);
3049 count++;
3050 }
3051 for (j = ext4_bg_num_gdb(sb, grp); j > 0; j--) {
3052 ext4_set_bit(EXT4_B2C(sbi, s++), buf);
3053 count++;
3054 }
3055 }
3056 if (!count)
3057 return 0;
3058 return EXT4_CLUSTERS_PER_GROUP(sb) -
3059 ext4_count_free(buf, EXT4_CLUSTERS_PER_GROUP(sb) / 8);
3060}
3061
3062/*
3063 * Compute the overhead and stash it in sbi->s_overhead
3064 */
3065int ext4_calculate_overhead(struct super_block *sb)
3066{
3067 struct ext4_sb_info *sbi = EXT4_SB(sb);
3068 struct ext4_super_block *es = sbi->s_es;
3069 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3070 ext4_fsblk_t overhead = 0;
4fdb5543 3071 char *buf = (char *) get_zeroed_page(GFP_NOFS);
952fc18e 3072
952fc18e
TT		 3073 if (!buf)
3074 return -ENOMEM;
3075
3076 /*
3077 * Compute the overhead (FS structures). This is constant
3078 * for a given filesystem unless the number of block groups
3079 * changes so we cache the previous value until it does.
3080 */
3081
3082 /*
3083 * All of the blocks before first_data_block are overhead
3084 */
3085 overhead = EXT4_B2C(sbi, le32_to_cpu(es->s_first_data_block));
3086
3087 /*
3088 * Add the overhead found in each block group
3089 */
3090 for (i = 0; i < ngroups; i++) {
3091 int blks;
3092
3093 blks = count_overhead(sb, i, buf);
3094 overhead += blks;
3095 if (blks)
3096 memset(buf, 0, PAGE_SIZE);
3097 cond_resched();
3098 }
b003b524
ES		 3099 /* Add the internal journal blocks as well */
3100 if (sbi->s_journal && !sbi->journal_bdev)
810da240 3101 overhead += EXT4_NUM_B2C(sbi, sbi->s_journal->j_maxlen);
0875a2b4 3102
952fc18e
TT		 3103 sbi->s_overhead = overhead;
3104 smp_wmb();
3105 free_page((unsigned long) buf);
3106 return 0;
3107}
3108
b5799018 3109static void ext4_set_resv_clusters(struct super_block *sb)
27dd4385
LC		 3110{
3111 ext4_fsblk_t resv_clusters;
b5799018 3112 struct ext4_sb_info *sbi = EXT4_SB(sb);
27dd4385 3113
30fac0f7
JK		 3114 /*
3115 * There's no need to reserve anything when we aren't using extents.
3116 * The space estimates are exact, there are no unwritten extents,
3117 * hole punching doesn't need new metadata... This is needed especially
3118 * to keep ext2/3 backward compatibility.
3119 */
e2b911c5 3120 if (!ext4_has_feature_extents(sb))
b5799018 3121 return;
27dd4385
LC		 3122 /*
3123 * By default we reserve 2% or 4096 clusters, whichever is smaller.
3124 * This should cover the situations where we can not afford to run
3125 * out of space like for example punch hole, or converting
556615dc 3126 * unwritten extents in delalloc path. In most cases such
27dd4385
LC		 3127 * allocation would require 1, or 2 blocks, higher numbers are
3128 * very rare.
3129 */
b5799018
TT		 3130 resv_clusters = (ext4_blocks_count(sbi->s_es) >>
3131 sbi->s_cluster_bits);
27dd4385
LC		 3132
3133 do_div(resv_clusters, 50);
3134 resv_clusters = min_t(ext4_fsblk_t, resv_clusters, 4096);
3135
b5799018 3136 atomic64_set(&sbi->s_resv_clusters, resv_clusters);
27dd4385
LC		 3137}
3138
2b2d6d01 3139static int ext4_fill_super(struct super_block *sb, void *data, int silent)
ac27a0ec 3140{
d4c402d9 3141 char *orig_data = kstrdup(data, GFP_KERNEL);
2b2d6d01 3142 struct buffer_head *bh;
617ba13b
MC		 3143 struct ext4_super_block *es = NULL;
3144 struct ext4_sb_info *sbi;
3145 ext4_fsblk_t block;
3146 ext4_fsblk_t sb_block = get_sb_block(&data);
70bbb3e0 3147 ext4_fsblk_t logical_sb_block;
ac27a0ec 3148 unsigned long offset = 0;
ac27a0ec
DK		 3149 unsigned long journal_devnum = 0;
3150 unsigned long def_mount_opts;
3151 struct inode *root;
0390131b 3152 const char *descr;
dcc7dae3 3153 int ret = -ENOMEM;
281b5995 3154 int blocksize, clustersize;
4ec11028
TT		 3155 unsigned int db_count;
3156 unsigned int i;
281b5995 3157 int needs_recovery, has_huge_files, has_bigalloc;
bd81d8ee 3158 __u64 blocks_count;
07aa2ea1 3159 int err = 0;
b3881f74 3160 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
bfff6873 3161 ext4_group_t first_not_zeroed;
ac27a0ec
DK		 3162
3163 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
3164 if (!sbi)
dcc7dae3 3165 goto out_free_orig;
705895b6
PE		 3166
3167 sbi->s_blockgroup_lock =
3168 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
3169 if (!sbi->s_blockgroup_lock) {
3170 kfree(sbi);
dcc7dae3 3171 goto out_free_orig;
705895b6 3172 }
ac27a0ec 3173 sb->s_fs_info = sbi;
2c0544b2 3174 sbi->s_sb = sb;
240799cd 3175 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
d9c9bef1 3176 sbi->s_sb_block = sb_block;
f613dfcb
TT		 3177 if (sb->s_bdev->bd_part)
3178 sbi->s_sectors_written_start =
3179 part_stat_read(sb->s_bdev->bd_part, sectors[1]);
ac27a0ec 3180
9f6200bb 3181 /* Cleanup superblock name */
ec3904dc 3182 strreplace(sb->s_id, '/', '!');
9f6200bb 3183
07aa2ea1 3184 /* -EINVAL is default */
dcc7dae3 3185 ret = -EINVAL;
617ba13b 3186 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
ac27a0ec 3187 if (!blocksize) {
b31e1552 3188 ext4_msg(sb, KERN_ERR, "unable to set blocksize");
ac27a0ec
DK		 3189 goto out_fail;
3190 }
3191
3192 /*
617ba13b 3193 * The ext4 superblock will not be buffer aligned for other than 1kB
ac27a0ec
DK		 3194 * block sizes. We need to calculate the offset from buffer start.
3195 */
617ba13b 3196 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
70bbb3e0
AM		 3197 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3198 offset = do_div(logical_sb_block, blocksize);
ac27a0ec 3199 } else {
70bbb3e0 3200 logical_sb_block = sb_block;
ac27a0ec
DK		 3201 }
3202
a8ac900b 3203 if (!(bh = sb_bread_unmovable(sb, logical_sb_block))) {
b31e1552 3204 ext4_msg(sb, KERN_ERR, "unable to read superblock");
ac27a0ec
DK		 3205 goto out_fail;
3206 }
3207 /*
3208 * Note: s_es must be initialized as soon as possible because
617ba13b 3209 * some ext4 macro-instructions depend on its value
ac27a0ec 3210 */
2716b802 3211 es = (struct ext4_super_block *) (bh->b_data + offset);
ac27a0ec
DK		 3212 sbi->s_es = es;
3213 sb->s_magic = le16_to_cpu(es->s_magic);
617ba13b
MC		 3214 if (sb->s_magic != EXT4_SUPER_MAGIC)
3215 goto cantfind_ext4;
afc32f7e 3216 sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
ac27a0ec 3217
feb0ab32 3218 /* Warn if metadata_csum and gdt_csum are both set. */
e2b911c5
DW		 3219 if (ext4_has_feature_metadata_csum(sb) &&
3220 ext4_has_feature_gdt_csum(sb))
363307e6 3221 ext4_warning(sb, "metadata_csum and uninit_bg are "
feb0ab32
DW		 3222 "redundant flags; please run fsck.");
3223
d25425f8
DW		 3224 /* Check for a known checksum algorithm */
3225 if (!ext4_verify_csum_type(sb, es)) {
3226 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3227 "unknown checksum algorithm.");
3228 silent = 1;
3229 goto cantfind_ext4;
3230 }
3231
0441984a 3232 /* Load the checksum driver */
e2b911c5 3233 if (ext4_has_feature_metadata_csum(sb)) {
0441984a
DW		 3234 sbi->s_chksum_driver = crypto_alloc_shash("crc32c", 0, 0);
3235 if (IS_ERR(sbi->s_chksum_driver)) {
3236 ext4_msg(sb, KERN_ERR, "Cannot load crc32c driver.");
3237 ret = PTR_ERR(sbi->s_chksum_driver);
3238 sbi->s_chksum_driver = NULL;
3239 goto failed_mount;
3240 }
3241 }
3242
a9c47317
DW		 3243 /* Check superblock checksum */
3244 if (!ext4_superblock_csum_verify(sb, es)) {
3245 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3246 "invalid superblock checksum. Run e2fsck?");
3247 silent = 1;
6a797d27 3248 ret = -EFSBADCRC;
a9c47317
DW		 3249 goto cantfind_ext4;
3250 }
3251
3252 /* Precompute checksum seed for all metadata */
e2b911c5 3253 if (ext4_has_feature_csum_seed(sb))
8c81bd8f
DW		 3254 sbi->s_csum_seed = le32_to_cpu(es->s_checksum_seed);
3255 else if (ext4_has_metadata_csum(sb))
a9c47317
DW		 3256 sbi->s_csum_seed = ext4_chksum(sbi, ~0, es->s_uuid,
3257 sizeof(es->s_uuid));
3258
ac27a0ec
DK		 3259 /* Set defaults before we parse the mount options */
3260 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
fd8c37ec 3261 set_opt(sb, INIT_INODE_TABLE);
617ba13b 3262 if (def_mount_opts & EXT4_DEFM_DEBUG)
fd8c37ec 3263 set_opt(sb, DEBUG);
87f26807 3264 if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
fd8c37ec 3265 set_opt(sb, GRPID);
617ba13b 3266 if (def_mount_opts & EXT4_DEFM_UID16)
fd8c37ec 3267 set_opt(sb, NO_UID32);
ea663336 3268 /* xattr user namespace & acls are now defaulted on */
ea663336 3269 set_opt(sb, XATTR_USER);
03010a33 3270#ifdef CONFIG_EXT4_FS_POSIX_ACL
ea663336 3271 set_opt(sb, POSIX_ACL);
2e7842b8 3272#endif
98c1a759
DW		 3273 /* don't forget to enable journal_csum when metadata_csum is enabled. */
3274 if (ext4_has_metadata_csum(sb))
3275 set_opt(sb, JOURNAL_CHECKSUM);
3276
617ba13b 3277 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
fd8c37ec 3278 set_opt(sb, JOURNAL_DATA);
617ba13b 3279 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
fd8c37ec 3280 set_opt(sb, ORDERED_DATA);
617ba13b 3281 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
fd8c37ec 3282 set_opt(sb, WRITEBACK_DATA);
617ba13b
MC		 3283
3284 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
fd8c37ec 3285 set_opt(sb, ERRORS_PANIC);
bb4f397a 3286 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
fd8c37ec 3287 set_opt(sb, ERRORS_CONT);
bb4f397a 3288 else
fd8c37ec 3289 set_opt(sb, ERRORS_RO);
45f1a9c3
DW		 3290 /* block_validity enabled by default; disable with noblock_validity */
3291 set_opt(sb, BLOCK_VALIDITY);
8b67f04a 3292 if (def_mount_opts & EXT4_DEFM_DISCARD)
fd8c37ec 3293 set_opt(sb, DISCARD);
ac27a0ec 3294
08cefc7a
EB		 3295 sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));
3296 sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid));
30773840
TT		 3297 sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
3298 sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
3299 sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
ac27a0ec 3300
8b67f04a 3301 if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0)
fd8c37ec 3302 set_opt(sb, BARRIER);
ac27a0ec 3303
dd919b98
AK		 3304 /*
3305 * enable delayed allocation by default
3306 * Use -o nodelalloc to turn it off
3307 */
bc0b75f7 3308 if (!IS_EXT3_SB(sb) && !IS_EXT2_SB(sb) &&
8b67f04a 3309 ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0))
fd8c37ec 3310 set_opt(sb, DELALLOC);
dd919b98 3311
51ce6511
LC		 3312 /*
3313 * set default s_li_wait_mult for lazyinit, for the case there is
3314 * no mount option specified.
3315 */
3316 sbi->s_li_wait_mult = EXT4_DEF_LI_WAIT_MULT;
3317
8b67f04a 3318 if (!parse_options((char *) sbi->s_es->s_mount_opts, sb,
661aa520 3319 &journal_devnum, &journal_ioprio, 0)) {
8b67f04a
TT		 3320 ext4_msg(sb, KERN_WARNING,
3321 "failed to parse options in superblock: %s",
3322 sbi->s_es->s_mount_opts);
3323 }
5a916be1 3324 sbi->s_def_mount_opt = sbi->s_mount_opt;
b3881f74 3325 if (!parse_options((char *) data, sb, &journal_devnum,
661aa520 3326 &journal_ioprio, 0))
ac27a0ec
DK		 3327 goto failed_mount;
3328
56889787
TT		 3329 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
3330 printk_once(KERN_WARNING "EXT4-fs: Warning: mounting "
3331 "with data=journal disables delayed "
3332 "allocation and O_DIRECT support!\n");
3333 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
3334 ext4_msg(sb, KERN_ERR, "can't mount with "
3335 "both data=journal and delalloc");
3336 goto failed_mount;
3337 }
3338 if (test_opt(sb, DIOREAD_NOLOCK)) {
3339 ext4_msg(sb, KERN_ERR, "can't mount with "
6ae6514b 3340 "both data=journal and dioread_nolock");
56889787
TT		 3341 goto failed_mount;
3342 }
923ae0ff
RZ		 3343 if (test_opt(sb, DAX)) {
3344 ext4_msg(sb, KERN_ERR, "can't mount with "
3345 "both data=journal and dax");
3346 goto failed_mount;
3347 }
56889787
TT		 3348 if (test_opt(sb, DELALLOC))
3349 clear_opt(sb, DELALLOC);
001e4a87
TH		 3350 } else {
3351 sb->s_iflags |= SB_I_CGROUPWB;
56889787
TT		 3352 }
3353
ac27a0ec 3354 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
482a7425 3355 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec 3356
617ba13b 3357 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
e2b911c5
DW		 3358 (ext4_has_compat_features(sb) ||
3359 ext4_has_ro_compat_features(sb) ||
3360 ext4_has_incompat_features(sb)))
b31e1552
ES		 3361 ext4_msg(sb, KERN_WARNING,
3362 "feature flags set on rev 0 fs, "
3363 "running e2fsck is recommended");
469108ff 3364
ed3654eb
TT		 3365 if (es->s_creator_os == cpu_to_le32(EXT4_OS_HURD)) {
3366 set_opt2(sb, HURD_COMPAT);
e2b911c5 3367 if (ext4_has_feature_64bit(sb)) {
ed3654eb
TT		 3368 ext4_msg(sb, KERN_ERR,
3369 "The Hurd can't support 64-bit file systems");
3370 goto failed_mount;
3371 }
3372 }
3373
2035e776
TT		 3374 if (IS_EXT2_SB(sb)) {
3375 if (ext2_feature_set_ok(sb))
3376 ext4_msg(sb, KERN_INFO, "mounting ext2 file system "
3377 "using the ext4 subsystem");
3378 else {
3379 ext4_msg(sb, KERN_ERR, "couldn't mount as ext2 due "
3380 "to feature incompatibilities");
3381 goto failed_mount;
3382 }
3383 }
3384
3385 if (IS_EXT3_SB(sb)) {
3386 if (ext3_feature_set_ok(sb))
3387 ext4_msg(sb, KERN_INFO, "mounting ext3 file system "
3388 "using the ext4 subsystem");
3389 else {
3390 ext4_msg(sb, KERN_ERR, "couldn't mount as ext3 due "
3391 "to feature incompatibilities");
3392 goto failed_mount;
3393 }
3394 }
3395
ac27a0ec
DK		 3396 /*
3397 * Check feature flags regardless of the revision level, since we
3398 * previously didn't change the revision level when setting the flags,
3399 * so there is a chance incompat flags are set on a rev 0 filesystem.
3400 */
a13fb1a4 3401 if (!ext4_feature_set_ok(sb, (sb->s_flags & MS_RDONLY)))
ac27a0ec 3402 goto failed_mount;
a13fb1a4 3403
261cb20c 3404 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
617ba13b
MC		 3405 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
3406 blocksize > EXT4_MAX_BLOCK_SIZE) {
b31e1552
ES		 3407 ext4_msg(sb, KERN_ERR,
3408 "Unsupported filesystem blocksize %d", blocksize);
ac27a0ec
DK		 3409 goto failed_mount;
3410 }
3411
923ae0ff
RZ		 3412 if (sbi->s_mount_opt & EXT4_MOUNT_DAX) {
3413 if (blocksize != PAGE_SIZE) {
3414 ext4_msg(sb, KERN_ERR,
3415 "error: unsupported blocksize for dax");
3416 goto failed_mount;
3417 }
3418 if (!sb->s_bdev->bd_disk->fops->direct_access) {
3419 ext4_msg(sb, KERN_ERR,
3420 "error: device does not support dax");
3421 goto failed_mount;
3422 }
3423 }
3424
e2b911c5 3425 if (ext4_has_feature_encrypt(sb) && es->s_encryption_level) {
6ddb2447
TT		 3426 ext4_msg(sb, KERN_ERR, "Unsupported encryption level %d",
3427 es->s_encryption_level);
3428 goto failed_mount;
3429 }
3430
ac27a0ec 3431 if (sb->s_blocksize != blocksize) {
ce40733c
AK		 3432 /* Validate the filesystem blocksize */
3433 if (!sb_set_blocksize(sb, blocksize)) {
b31e1552 3434 ext4_msg(sb, KERN_ERR, "bad block size %d",
ce40733c 3435 blocksize);
ac27a0ec
DK		 3436 goto failed_mount;
3437 }
3438
2b2d6d01 3439 brelse(bh);
70bbb3e0
AM		 3440 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3441 offset = do_div(logical_sb_block, blocksize);
a8ac900b 3442 bh = sb_bread_unmovable(sb, logical_sb_block);
ac27a0ec 3443 if (!bh) {
b31e1552
ES		 3444 ext4_msg(sb, KERN_ERR,
3445 "Can't read superblock on 2nd try");
ac27a0ec
DK		 3446 goto failed_mount;
3447 }
2716b802 3448 es = (struct ext4_super_block *)(bh->b_data + offset);
ac27a0ec 3449 sbi->s_es = es;
617ba13b 3450 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
b31e1552
ES		 3451 ext4_msg(sb, KERN_ERR,
3452 "Magic mismatch, very weird!");
ac27a0ec
DK		 3453 goto failed_mount;
3454 }
3455 }
3456
e2b911c5 3457 has_huge_files = ext4_has_feature_huge_file(sb);
f287a1a5
TT		 3458 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
3459 has_huge_files);
3460 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
ac27a0ec 3461
617ba13b
MC		 3462 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
3463 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
3464 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
ac27a0ec
DK		 3465 } else {
3466 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
3467 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
617ba13b 3468 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
1330593e 3469 (!is_power_of_2(sbi->s_inode_size)) ||
ac27a0ec 3470 (sbi->s_inode_size > blocksize)) {
b31e1552
ES		 3471 ext4_msg(sb, KERN_ERR,
3472 "unsupported inode size: %d",
2b2d6d01 3473 sbi->s_inode_size);
ac27a0ec
DK		 3474 goto failed_mount;
3475 }
ef7f3835
KS		 3476 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
3477 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
ac27a0ec 3478 }
0b8e58a1 3479
0d1ee42f 3480 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
e2b911c5 3481 if (ext4_has_feature_64bit(sb)) {
8fadc143 3482 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
0d1ee42f 3483 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
d8ea6cf8 3484 !is_power_of_2(sbi->s_desc_size)) {
b31e1552
ES		 3485 ext4_msg(sb, KERN_ERR,
3486 "unsupported descriptor size %lu",
0d1ee42f
AR		 3487 sbi->s_desc_size);
3488 goto failed_mount;
3489 }
3490 } else
3491 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
0b8e58a1 3492
ac27a0ec 3493 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
ac27a0ec 3494 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
b47b6f38 3495 if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
617ba13b 3496 goto cantfind_ext4;
0b8e58a1 3497
617ba13b 3498 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
ac27a0ec 3499 if (sbi->s_inodes_per_block == 0)
617ba13b 3500 goto cantfind_ext4;
ac27a0ec
DK		 3501 sbi->s_itb_per_group = sbi->s_inodes_per_group /
3502 sbi->s_inodes_per_block;
0d1ee42f 3503 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
ac27a0ec
DK		 3504 sbi->s_sbh = bh;
3505 sbi->s_mount_state = le16_to_cpu(es->s_state);
e57aa839
FW		 3506 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
3507 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
0b8e58a1 3508
2b2d6d01 3509 for (i = 0; i < 4; i++)
ac27a0ec
DK		 3510 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
3511 sbi->s_def_hash_version = es->s_def_hash_version;
e2b911c5 3512 if (ext4_has_feature_dir_index(sb)) {
23301410
TT		 3513 i = le32_to_cpu(es->s_flags);
3514 if (i & EXT2_FLAGS_UNSIGNED_HASH)
3515 sbi->s_hash_unsigned = 3;
3516 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
f99b2589 3517#ifdef __CHAR_UNSIGNED__
23301410
TT		 3518 if (!(sb->s_flags & MS_RDONLY))
3519 es->s_flags |=
3520 cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
3521 sbi->s_hash_unsigned = 3;
f99b2589 3522#else
23301410
TT		 3523 if (!(sb->s_flags & MS_RDONLY))
3524 es->s_flags |=
3525 cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
f99b2589 3526#endif
23301410 3527 }
f99b2589 3528 }
ac27a0ec 3529
281b5995
TT		 3530 /* Handle clustersize */
3531 clustersize = BLOCK_SIZE << le32_to_cpu(es->s_log_cluster_size);
e2b911c5 3532 has_bigalloc = ext4_has_feature_bigalloc(sb);
281b5995
TT		 3533 if (has_bigalloc) {
3534 if (clustersize < blocksize) {
3535 ext4_msg(sb, KERN_ERR,
3536 "cluster size (%d) smaller than "
3537 "block size (%d)", clustersize, blocksize);
3538 goto failed_mount;
3539 }
3540 sbi->s_cluster_bits = le32_to_cpu(es->s_log_cluster_size) -
3541 le32_to_cpu(es->s_log_block_size);
3542 sbi->s_clusters_per_group =
3543 le32_to_cpu(es->s_clusters_per_group);
3544 if (sbi->s_clusters_per_group > blocksize * 8) {
3545 ext4_msg(sb, KERN_ERR,
3546 "#clusters per group too big: %lu",
3547 sbi->s_clusters_per_group);
3548 goto failed_mount;
3549 }
3550 if (sbi->s_blocks_per_group !=
3551 (sbi->s_clusters_per_group * (clustersize / blocksize))) {
3552 ext4_msg(sb, KERN_ERR, "blocks per group (%lu) and "
3553 "clusters per group (%lu) inconsistent",
3554 sbi->s_blocks_per_group,
3555 sbi->s_clusters_per_group);
3556 goto failed_mount;
3557 }
3558 } else {
3559 if (clustersize != blocksize) {
3560 ext4_warning(sb, "fragment/cluster size (%d) != "
3561 "block size (%d)", clustersize,
3562 blocksize);
3563 clustersize = blocksize;
3564 }
3565 if (sbi->s_blocks_per_group > blocksize * 8) {
3566 ext4_msg(sb, KERN_ERR,
3567 "#blocks per group too big: %lu",
3568 sbi->s_blocks_per_group);
3569 goto failed_mount;
3570 }
3571 sbi->s_clusters_per_group = sbi->s_blocks_per_group;
3572 sbi->s_cluster_bits = 0;
ac27a0ec 3573 }
281b5995
TT		 3574 sbi->s_cluster_ratio = clustersize / blocksize;
3575
ac27a0ec 3576 if (sbi->s_inodes_per_group > blocksize * 8) {
b31e1552
ES		 3577 ext4_msg(sb, KERN_ERR,
3578 "#inodes per group too big: %lu",
2b2d6d01 3579 sbi->s_inodes_per_group);
ac27a0ec
DK		 3580 goto failed_mount;
3581 }
3582
960fd856
TT		 3583 /* Do we have standard group size of clustersize * 8 blocks ? */
3584 if (sbi->s_blocks_per_group == clustersize << 3)
3585 set_opt2(sb, STD_GROUP_SIZE);
3586
bf43d84b
ES		 3587 /*
3588 * Test whether we have more sectors than will fit in sector_t,
3589 * and whether the max offset is addressable by the page cache.
3590 */
5a9ae68a 3591 err = generic_check_addressable(sb->s_blocksize_bits,
30ca22c7 3592 ext4_blocks_count(es));
5a9ae68a 3593 if (err) {
b31e1552 3594 ext4_msg(sb, KERN_ERR, "filesystem"
bf43d84b 3595 " too large to mount safely on this system");
ac27a0ec 3596 if (sizeof(sector_t) < 8)
90c699a9 3597 ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled");
ac27a0ec
DK		 3598 goto failed_mount;
3599 }
3600
617ba13b
MC		 3601 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
3602 goto cantfind_ext4;
e7c95593 3603
0f2ddca6
FTN		 3604 /* check blocks count against device size */
3605 blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
3606 if (blocks_count && ext4_blocks_count(es) > blocks_count) {
b31e1552
ES		 3607 ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
3608 "exceeds size of device (%llu blocks)",
0f2ddca6
FTN		 3609 ext4_blocks_count(es), blocks_count);
3610 goto failed_mount;
3611 }
3612
0b8e58a1
AD		 3613 /*
3614 * It makes no sense for the first data block to be beyond the end
3615 * of the filesystem.
3616 */
3617 if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
5635a62b 3618 ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
b31e1552
ES		 3619 "block %u is beyond end of filesystem (%llu)",
3620 le32_to_cpu(es->s_first_data_block),
3621 ext4_blocks_count(es));
e7c95593
ES		 3622 goto failed_mount;
3623 }
bd81d8ee
LV		 3624 blocks_count = (ext4_blocks_count(es) -
3625 le32_to_cpu(es->s_first_data_block) +
3626 EXT4_BLOCKS_PER_GROUP(sb) - 1);
3627 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
4ec11028 3628 if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
b31e1552 3629 ext4_msg(sb, KERN_WARNING, "groups count too large: %u "
4ec11028 3630 "(block count %llu, first data block %u, "
b31e1552 3631 "blocks per group %lu)", sbi->s_groups_count,
4ec11028
TT		 3632 ext4_blocks_count(es),
3633 le32_to_cpu(es->s_first_data_block),
3634 EXT4_BLOCKS_PER_GROUP(sb));
3635 goto failed_mount;
3636 }
bd81d8ee 3637 sbi->s_groups_count = blocks_count;
fb0a387d
ES		 3638 sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
3639 (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
617ba13b
MC		 3640 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
3641 EXT4_DESC_PER_BLOCK(sb);
f18a5f21
TT		 3642 sbi->s_group_desc = ext4_kvmalloc(db_count *
3643 sizeof(struct buffer_head *),
3644 GFP_KERNEL);
ac27a0ec 3645 if (sbi->s_group_desc == NULL) {
b31e1552 3646 ext4_msg(sb, KERN_ERR, "not enough memory");
2cde417d 3647 ret = -ENOMEM;
ac27a0ec
DK		 3648 goto failed_mount;
3649 }
3650
705895b6 3651 bgl_lock_init(sbi->s_blockgroup_lock);
ac27a0ec
DK		 3652
3653 for (i = 0; i < db_count; i++) {
70bbb3e0 3654 block = descriptor_loc(sb, logical_sb_block, i);
a8ac900b 3655 sbi->s_group_desc[i] = sb_bread_unmovable(sb, block);
ac27a0ec 3656 if (!sbi->s_group_desc[i]) {
b31e1552
ES		 3657 ext4_msg(sb, KERN_ERR,
3658 "can't read group descriptor %d", i);
ac27a0ec
DK		 3659 db_count = i;
3660 goto failed_mount2;
3661 }
3662 }
bfff6873 3663 if (!ext4_check_descriptors(sb, &first_not_zeroed)) {
b31e1552 3664 ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
6a797d27 3665 ret = -EFSCORRUPTED;
f9ae9cf5 3666 goto failed_mount2;
ac27a0ec 3667 }
772cb7c8 3668
f9ae9cf5 3669 sbi->s_gdb_count = db_count;
ac27a0ec
DK		 3670 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
3671 spin_lock_init(&sbi->s_next_gen_lock);
3672
04ecddb7
JM		 3673 setup_timer(&sbi->s_err_report, print_daily_error_info,
3674 (unsigned long) sb);
04496411 3675
a75ae78f 3676 /* Register extent status tree shrinker */
eb68d0e2 3677 if (ext4_es_register_shrinker(sbi))
ce7e010a 3678 goto failed_mount3;
ce7e010a 3679
c9de560d 3680 sbi->s_stripe = ext4_get_stripe_size(sbi);
67a5da56 3681 sbi->s_extent_max_zeroout_kb = 32;
c9de560d 3682
f9ae9cf5
TT		 3683 /*
3684 * set up enough so that it can read an inode
3685 */
f6e63f90 3686 sb->s_op = &ext4_sops;
617ba13b
MC		 3687 sb->s_export_op = &ext4_export_ops;
3688 sb->s_xattr = ext4_xattr_handlers;
ac27a0ec 3689#ifdef CONFIG_QUOTA
617ba13b 3690 sb->dq_op = &ext4_quota_operations;
e2b911c5 3691 if (ext4_has_feature_quota(sb))
1fa5efe3 3692 sb->s_qcop = &dquot_quotactl_sysfile_ops;
262b4662
JK		 3693 else
3694 sb->s_qcop = &ext4_qctl_operations;
689c958c 3695 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP | QTYPE_MASK_PRJ;
ac27a0ec 3696#endif
f2fa2ffc
AK		 3697 memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
3698
ac27a0ec 3699 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
3b9d4ed2 3700 mutex_init(&sbi->s_orphan_lock);
ac27a0ec
DK		 3701
3702 sb->s_root = NULL;
3703
3704 needs_recovery = (es->s_last_orphan != 0 ||
e2b911c5 3705 ext4_has_feature_journal_needs_recovery(sb));
ac27a0ec 3706
e2b911c5 3707 if (ext4_has_feature_mmp(sb) && !(sb->s_flags & MS_RDONLY))
c5e06d10 3708 if (ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block)))
50460fe8 3709 goto failed_mount3a;
c5e06d10 3710
ac27a0ec
DK		 3711 /*
3712 * The first inode we look at is the journal inode. Don't try
3713 * root first: it may be modified in the journal!
3714 */
e2b911c5 3715 if (!test_opt(sb, NOLOAD) && ext4_has_feature_journal(sb)) {
617ba13b 3716 if (ext4_load_journal(sb, es, journal_devnum))
50460fe8 3717 goto failed_mount3a;
0390131b 3718 } else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) &&
e2b911c5 3719 ext4_has_feature_journal_needs_recovery(sb)) {
b31e1552
ES		 3720 ext4_msg(sb, KERN_ERR, "required journal recovery "
3721 "suppressed and not mounted read-only");
744692dc 3722 goto failed_mount_wq;
ac27a0ec 3723 } else {
1e381f60
DM		 3724 /* Nojournal mode, all journal mount options are illegal */
3725 if (test_opt2(sb, EXPLICIT_JOURNAL_CHECKSUM)) {
3726 ext4_msg(sb, KERN_ERR, "can't mount with "
3727 "journal_checksum, fs mounted w/o journal");
3728 goto failed_mount_wq;
3729 }
3730 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
3731 ext4_msg(sb, KERN_ERR, "can't mount with "
3732 "journal_async_commit, fs mounted w/o journal");
3733 goto failed_mount_wq;
3734 }
3735 if (sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) {
3736 ext4_msg(sb, KERN_ERR, "can't mount with "
3737 "commit=%lu, fs mounted w/o journal",
3738 sbi->s_commit_interval / HZ);
3739 goto failed_mount_wq;
3740 }
3741 if (EXT4_MOUNT_DATA_FLAGS &
3742 (sbi->s_mount_opt ^ sbi->s_def_mount_opt)) {
3743 ext4_msg(sb, KERN_ERR, "can't mount with "
3744 "data=, fs mounted w/o journal");
3745 goto failed_mount_wq;
3746 }
3747 sbi->s_def_mount_opt &= EXT4_MOUNT_JOURNAL_CHECKSUM;
3748 clear_opt(sb, JOURNAL_CHECKSUM);
fd8c37ec 3749 clear_opt(sb, DATA_FLAGS);
0390131b
FM		 3750 sbi->s_journal = NULL;
3751 needs_recovery = 0;
3752 goto no_journal;
ac27a0ec
DK		 3753 }
3754
e2b911c5 3755 if (ext4_has_feature_64bit(sb) &&
eb40a09c
JS		 3756 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
3757 JBD2_FEATURE_INCOMPAT_64BIT)) {
b31e1552 3758 ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
744692dc 3759 goto failed_mount_wq;
eb40a09c
JS		 3760 }
3761
25ed6e8a
DW		 3762 if (!set_journal_csum_feature_set(sb)) {
3763 ext4_msg(sb, KERN_ERR, "Failed to set journal checksum "
3764 "feature set");
3765 goto failed_mount_wq;
d4da6c9c 3766 }
818d276c 3767
ac27a0ec
DK		 3768 /* We have now updated the journal if required, so we can
3769 * validate the data journaling mode. */
3770 switch (test_opt(sb, DATA_FLAGS)) {
3771 case 0:
3772 /* No mode set, assume a default based on the journal
63f57933
AM		 3773 * capabilities: ORDERED_DATA if the journal can
3774 * cope, else JOURNAL_DATA
3775 */
dab291af
MC		 3776 if (jbd2_journal_check_available_features
3777 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
fd8c37ec 3778 set_opt(sb, ORDERED_DATA);
ac27a0ec 3779 else
fd8c37ec 3780 set_opt(sb, JOURNAL_DATA);
ac27a0ec
DK		 3781 break;
3782
617ba13b
MC		 3783 case EXT4_MOUNT_ORDERED_DATA:
3784 case EXT4_MOUNT_WRITEBACK_DATA:
dab291af
MC		 3785 if (!jbd2_journal_check_available_features
3786 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
b31e1552
ES		 3787 ext4_msg(sb, KERN_ERR, "Journal does not support "
3788 "requested data journaling mode");
744692dc 3789 goto failed_mount_wq;
ac27a0ec
DK		 3790 }
3791 default:
3792 break;
3793 }
b3881f74 3794 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
ac27a0ec 3795
18aadd47
BJ		 3796 sbi->s_journal->j_commit_callback = ext4_journal_commit_callback;
3797
ce7e010a 3798no_journal:
9c191f70
M		 3799 if (ext4_mballoc_ready) {
3800 sbi->s_mb_cache = ext4_xattr_create_cache(sb->s_id);
3801 if (!sbi->s_mb_cache) {
3802 ext4_msg(sb, KERN_ERR, "Failed to create an mb_cache");
3803 goto failed_mount_wq;
3804 }
3805 }
3806
e2b911c5 3807 if ((DUMMY_ENCRYPTION_ENABLED(sbi) || ext4_has_feature_encrypt(sb)) &&
1cb767cd
TT		 3808 (blocksize != PAGE_CACHE_SIZE)) {
3809 ext4_msg(sb, KERN_ERR,
3810 "Unsupported blocksize for fs encryption");
3811 goto failed_mount_wq;
3812 }
3813
e2b911c5
DW		 3814 if (DUMMY_ENCRYPTION_ENABLED(sbi) && !(sb->s_flags & MS_RDONLY) &&
3815 !ext4_has_feature_encrypt(sb)) {
3816 ext4_set_feature_encrypt(sb);
6ddb2447
TT		 3817 ext4_commit_super(sb, 1);
3818 }
3819
952fc18e
TT		 3820 /*
3821 * Get the # of file system overhead blocks from the
3822 * superblock if present.
3823 */
3824 if (es->s_overhead_clusters)
3825 sbi->s_overhead = le32_to_cpu(es->s_overhead_clusters);
3826 else {
07aa2ea1
LC		 3827 err = ext4_calculate_overhead(sb);
3828 if (err)
952fc18e
TT		 3829 goto failed_mount_wq;
3830 }
3831
fd89d5f2
TH		 3832 /*
3833 * The maximum number of concurrent works can be high and
3834 * concurrency isn't really necessary. Limit it to 1.
3835 */
2e8fa54e
JK		 3836 EXT4_SB(sb)->rsv_conversion_wq =
3837 alloc_workqueue("ext4-rsv-conversion", WQ_MEM_RECLAIM | WQ_UNBOUND, 1);
3838 if (!EXT4_SB(sb)->rsv_conversion_wq) {
3839 printk(KERN_ERR "EXT4-fs: failed to create workqueue\n");
07aa2ea1 3840 ret = -ENOMEM;
2e8fa54e
JK		 3841 goto failed_mount4;
3842 }
3843
ac27a0ec 3844 /*
dab291af 3845 * The jbd2_journal_load will have done any necessary log recovery,
ac27a0ec
DK		 3846 * so we can safely mount the rest of the filesystem now.
3847 */
3848
1d1fe1ee
DH		 3849 root = ext4_iget(sb, EXT4_ROOT_INO);
3850 if (IS_ERR(root)) {
b31e1552 3851 ext4_msg(sb, KERN_ERR, "get root inode failed");
1d1fe1ee 3852 ret = PTR_ERR(root);
32a9bb57 3853 root = NULL;
ac27a0ec
DK		 3854 goto failed_mount4;
3855 }
3856 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
b31e1552 3857 ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
94bf608a 3858 iput(root);
ac27a0ec
DK		 3859 goto failed_mount4;
3860 }
48fde701 3861 sb->s_root = d_make_root(root);
1d1fe1ee 3862 if (!sb->s_root) {
b31e1552 3863 ext4_msg(sb, KERN_ERR, "get root dentry failed");
1d1fe1ee
DH		 3864 ret = -ENOMEM;
3865 goto failed_mount4;
3866 }
ac27a0ec 3867
7e84b621
ES		 3868 if (ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY))
3869 sb->s_flags |= MS_RDONLY;
ef7f3835
KS		 3870
3871 /* determine the minimum size of new large inodes, if present */
3872 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
3873 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
3874 EXT4_GOOD_OLD_INODE_SIZE;
e2b911c5 3875 if (ext4_has_feature_extra_isize(sb)) {
ef7f3835
KS		 3876 if (sbi->s_want_extra_isize <
3877 le16_to_cpu(es->s_want_extra_isize))
3878 sbi->s_want_extra_isize =
3879 le16_to_cpu(es->s_want_extra_isize);
3880 if (sbi->s_want_extra_isize <
3881 le16_to_cpu(es->s_min_extra_isize))
3882 sbi->s_want_extra_isize =
3883 le16_to_cpu(es->s_min_extra_isize);
3884 }
3885 }
3886 /* Check if enough inode space is available */
3887 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
3888 sbi->s_inode_size) {
3889 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
3890 EXT4_GOOD_OLD_INODE_SIZE;
b31e1552
ES		 3891 ext4_msg(sb, KERN_INFO, "required extra inode space not"
3892 "available");
ef7f3835
KS		 3893 }
3894
b5799018 3895 ext4_set_resv_clusters(sb);
27dd4385 3896
6fd058f7
TT		 3897 err = ext4_setup_system_zone(sb);
3898 if (err) {
b31e1552 3899 ext4_msg(sb, KERN_ERR, "failed to initialize system "
fbe845dd 3900 "zone (%d)", err);
f9ae9cf5
TT		 3901 goto failed_mount4a;
3902 }
3903
3904 ext4_ext_init(sb);
3905 err = ext4_mb_init(sb);
3906 if (err) {
3907 ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)",
3908 err);
dcf2d804 3909 goto failed_mount5;
c2774d84
AK		 3910 }
3911
d5e03cbb
TT		 3912 block = ext4_count_free_clusters(sb);
3913 ext4_free_blocks_count_set(sbi->s_es,
3914 EXT4_C2B(sbi, block));
908c7f19
TH		 3915 err = percpu_counter_init(&sbi->s_freeclusters_counter, block,
3916 GFP_KERNEL);
d5e03cbb
TT		 3917 if (!err) {
3918 unsigned long freei = ext4_count_free_inodes(sb);
3919 sbi->s_es->s_free_inodes_count = cpu_to_le32(freei);
908c7f19
TH		 3920 err = percpu_counter_init(&sbi->s_freeinodes_counter, freei,
3921 GFP_KERNEL);
d5e03cbb
TT		 3922 }
3923 if (!err)
3924 err = percpu_counter_init(&sbi->s_dirs_counter,
908c7f19 3925 ext4_count_dirs(sb), GFP_KERNEL);
d5e03cbb 3926 if (!err)
908c7f19
TH		 3927 err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0,
3928 GFP_KERNEL);
d5e03cbb
TT		 3929 if (err) {
3930 ext4_msg(sb, KERN_ERR, "insufficient memory");
3931 goto failed_mount6;
3932 }
3933
e2b911c5 3934 if (ext4_has_feature_flex_bg(sb))
d5e03cbb
TT		 3935 if (!ext4_fill_flex_info(sb)) {
3936 ext4_msg(sb, KERN_ERR,
3937 "unable to initialize "
3938 "flex_bg meta info!");
3939 goto failed_mount6;
3940 }
3941
bfff6873
LC		 3942 err = ext4_register_li_request(sb, first_not_zeroed);
3943 if (err)
dcf2d804 3944 goto failed_mount6;
bfff6873 3945
b5799018 3946 err = ext4_register_sysfs(sb);
dcf2d804
TM		 3947 if (err)
3948 goto failed_mount7;
3197ebdb 3949
9b2ff357
JK		 3950#ifdef CONFIG_QUOTA
3951 /* Enable quota usage during mount. */
e2b911c5 3952 if (ext4_has_feature_quota(sb) && !(sb->s_flags & MS_RDONLY)) {
9b2ff357
JK		 3953 err = ext4_enable_quotas(sb);
3954 if (err)
3955 goto failed_mount8;
3956 }
3957#endif /* CONFIG_QUOTA */
3958
617ba13b
MC		 3959 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
3960 ext4_orphan_cleanup(sb, es);
3961 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
0390131b 3962 if (needs_recovery) {
b31e1552 3963 ext4_msg(sb, KERN_INFO, "recovery complete");
0390131b
FM		 3964 ext4_mark_recovery_complete(sb, es);
3965 }
3966 if (EXT4_SB(sb)->s_journal) {
3967 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
3968 descr = " journalled data mode";
3969 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
3970 descr = " ordered data mode";
3971 else
3972 descr = " writeback data mode";
3973 } else
3974 descr = "out journal";
3975
79add3a3
LC		 3976 if (test_opt(sb, DISCARD)) {
3977 struct request_queue *q = bdev_get_queue(sb->s_bdev);
3978 if (!blk_queue_discard(q))
3979 ext4_msg(sb, KERN_WARNING,
3980 "mounting with \"discard\" option, but "
3981 "the device does not support discard");
3982 }
3983
e294a537
TT		 3984 if (___ratelimit(&ext4_mount_msg_ratelimit, "EXT4-fs mount"))
3985 ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. "
3986 "Opts: %s%s%s", descr, sbi->s_es->s_mount_opts,
3987 *sbi->s_es->s_mount_opts ? "; " : "", orig_data);
ac27a0ec 3988
66e61a9e
TT		 3989 if (es->s_error_count)
3990 mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */
ac27a0ec 3991
efbed4dc
TT		 3992 /* Enable message ratelimiting. Default is 10 messages per 5 secs. */
3993 ratelimit_state_init(&sbi->s_err_ratelimit_state, 5 * HZ, 10);
3994 ratelimit_state_init(&sbi->s_warning_ratelimit_state, 5 * HZ, 10);
3995 ratelimit_state_init(&sbi->s_msg_ratelimit_state, 5 * HZ, 10);
3996
d4c402d9 3997 kfree(orig_data);
ac27a0ec
DK		 3998 return 0;
3999
617ba13b 4000cantfind_ext4:
ac27a0ec 4001 if (!silent)
b31e1552 4002 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
ac27a0ec
DK		 4003 goto failed_mount;
4004
72ba7450
TT		 4005#ifdef CONFIG_QUOTA
4006failed_mount8:
ebd173be 4007 ext4_unregister_sysfs(sb);
72ba7450 4008#endif
dcf2d804
TM		 4009failed_mount7:
4010 ext4_unregister_li_request(sb);
4011failed_mount6:
f9ae9cf5 4012 ext4_mb_release(sb);
d5e03cbb 4013 if (sbi->s_flex_groups)
b93b41d4 4014 kvfree(sbi->s_flex_groups);
d5e03cbb
TT		 4015 percpu_counter_destroy(&sbi->s_freeclusters_counter);
4016 percpu_counter_destroy(&sbi->s_freeinodes_counter);
4017 percpu_counter_destroy(&sbi->s_dirs_counter);
4018 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
00764937 4019failed_mount5:
f9ae9cf5
TT		 4020 ext4_ext_release(sb);
4021 ext4_release_system_zone(sb);
4022failed_mount4a:
94bf608a 4023 dput(sb->s_root);
32a9bb57 4024 sb->s_root = NULL;
94bf608a 4025failed_mount4:
b31e1552 4026 ext4_msg(sb, KERN_ERR, "mount failed");
2e8fa54e
JK		 4027 if (EXT4_SB(sb)->rsv_conversion_wq)
4028 destroy_workqueue(EXT4_SB(sb)->rsv_conversion_wq);
4c0425ff 4029failed_mount_wq:
0390131b
FM		 4030 if (sbi->s_journal) {
4031 jbd2_journal_destroy(sbi->s_journal);
4032 sbi->s_journal = NULL;
4033 }
50460fe8 4034failed_mount3a:
d3922a77 4035 ext4_es_unregister_shrinker(sbi);
eb68d0e2 4036failed_mount3:
9105bb14 4037 del_timer_sync(&sbi->s_err_report);
c5e06d10
JL		 4038 if (sbi->s_mmp_tsk)
4039 kthread_stop(sbi->s_mmp_tsk);
ac27a0ec
DK		 4040failed_mount2:
4041 for (i = 0; i < db_count; i++)
4042 brelse(sbi->s_group_desc[i]);
b93b41d4 4043 kvfree(sbi->s_group_desc);
ac27a0ec 4044failed_mount:
0441984a
DW		 4045 if (sbi->s_chksum_driver)
4046 crypto_free_shash(sbi->s_chksum_driver);
ac27a0ec 4047#ifdef CONFIG_QUOTA
a2d4a646 4048 for (i = 0; i < EXT4_MAXQUOTAS; i++)
ac27a0ec
DK		 4049 kfree(sbi->s_qf_names[i]);
4050#endif
617ba13b 4051 ext4_blkdev_remove(sbi);
ac27a0ec
DK		 4052 brelse(bh);
4053out_fail:
4054 sb->s_fs_info = NULL;
f6830165 4055 kfree(sbi->s_blockgroup_lock);
ac27a0ec 4056 kfree(sbi);
dcc7dae3 4057out_free_orig:
d4c402d9 4058 kfree(orig_data);
07aa2ea1 4059 return err ? err : ret;
ac27a0ec
DK		 4060}
4061
4062/*
4063 * Setup any per-fs journal parameters now. We'll do this both on
4064 * initial mount, once the journal has been initialised but before we've
4065 * done any recovery; and again on any subsequent remount.
4066 */
617ba13b 4067static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
ac27a0ec 4068{
617ba13b 4069 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4070
30773840
TT		 4071 journal->j_commit_interval = sbi->s_commit_interval;
4072 journal->j_min_batch_time = sbi->s_min_batch_time;
4073 journal->j_max_batch_time = sbi->s_max_batch_time;
ac27a0ec 4074
a931da6a 4075 write_lock(&journal->j_state_lock);
ac27a0ec 4076 if (test_opt(sb, BARRIER))
dab291af 4077 journal->j_flags |= JBD2_BARRIER;
ac27a0ec 4078 else
dab291af 4079 journal->j_flags &= ~JBD2_BARRIER;
5bf5683a
HK		 4080 if (test_opt(sb, DATA_ERR_ABORT))
4081 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
4082 else
4083 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
a931da6a 4084 write_unlock(&journal->j_state_lock);
ac27a0ec
DK		 4085}
4086
617ba13b 4087static journal_t *ext4_get_journal(struct super_block *sb,
ac27a0ec
DK		 4088 unsigned int journal_inum)
4089{
4090 struct inode *journal_inode;
4091 journal_t *journal;
4092
e2b911c5 4093 BUG_ON(!ext4_has_feature_journal(sb));
0390131b 4094
ac27a0ec
DK		 4095 /* First, test for the existence of a valid inode on disk. Bad
4096 * things happen if we iget() an unused inode, as the subsequent
4097 * iput() will try to delete it. */
4098
1d1fe1ee
DH		 4099 journal_inode = ext4_iget(sb, journal_inum);
4100 if (IS_ERR(journal_inode)) {
b31e1552 4101 ext4_msg(sb, KERN_ERR, "no journal found");
ac27a0ec
DK		 4102 return NULL;
4103 }
4104 if (!journal_inode->i_nlink) {
4105 make_bad_inode(journal_inode);
4106 iput(journal_inode);
b31e1552 4107 ext4_msg(sb, KERN_ERR, "journal inode is deleted");
ac27a0ec
DK		 4108 return NULL;
4109 }
4110
e5f8eab8 4111 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
ac27a0ec 4112 journal_inode, journal_inode->i_size);
1d1fe1ee 4113 if (!S_ISREG(journal_inode->i_mode)) {
b31e1552 4114 ext4_msg(sb, KERN_ERR, "invalid journal inode");
ac27a0ec
DK		 4115 iput(journal_inode);
4116 return NULL;
4117 }
4118
dab291af 4119 journal = jbd2_journal_init_inode(journal_inode);
ac27a0ec 4120 if (!journal) {
b31e1552 4121 ext4_msg(sb, KERN_ERR, "Could not load journal inode");
ac27a0ec
DK		 4122 iput(journal_inode);
4123 return NULL;
4124 }
4125 journal->j_private = sb;
617ba13b 4126 ext4_init_journal_params(sb, journal);
ac27a0ec
DK		 4127 return journal;
4128}
4129
617ba13b 4130static journal_t *ext4_get_dev_journal(struct super_block *sb,
ac27a0ec
DK		 4131 dev_t j_dev)
4132{
2b2d6d01 4133 struct buffer_head *bh;
ac27a0ec 4134 journal_t *journal;
617ba13b
MC		 4135 ext4_fsblk_t start;
4136 ext4_fsblk_t len;
ac27a0ec 4137 int hblock, blocksize;
617ba13b 4138 ext4_fsblk_t sb_block;
ac27a0ec 4139 unsigned long offset;
2b2d6d01 4140 struct ext4_super_block *es;
ac27a0ec
DK		 4141 struct block_device *bdev;
4142
e2b911c5 4143 BUG_ON(!ext4_has_feature_journal(sb));
0390131b 4144
b31e1552 4145 bdev = ext4_blkdev_get(j_dev, sb);
ac27a0ec
DK		 4146 if (bdev == NULL)
4147 return NULL;
4148
ac27a0ec 4149 blocksize = sb->s_blocksize;
e1defc4f 4150 hblock = bdev_logical_block_size(bdev);
ac27a0ec 4151 if (blocksize < hblock) {
b31e1552
ES		 4152 ext4_msg(sb, KERN_ERR,
4153 "blocksize too small for journal device");
ac27a0ec
DK		 4154 goto out_bdev;
4155 }
4156
617ba13b
MC		 4157 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
4158 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
ac27a0ec
DK		 4159 set_blocksize(bdev, blocksize);
4160 if (!(bh = __bread(bdev, sb_block, blocksize))) {
b31e1552
ES		 4161 ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
4162 "external journal");
ac27a0ec
DK		 4163 goto out_bdev;
4164 }
4165
2716b802 4166 es = (struct ext4_super_block *) (bh->b_data + offset);
617ba13b 4167 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
ac27a0ec 4168 !(le32_to_cpu(es->s_feature_incompat) &
617ba13b 4169 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
b31e1552
ES		 4170 ext4_msg(sb, KERN_ERR, "external journal has "
4171 "bad superblock");
ac27a0ec
DK		 4172 brelse(bh);
4173 goto out_bdev;
4174 }
4175
df4763be
DW		 4176 if ((le32_to_cpu(es->s_feature_ro_compat) &
4177 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) &&
4178 es->s_checksum != ext4_superblock_csum(sb, es)) {
4179 ext4_msg(sb, KERN_ERR, "external journal has "
4180 "corrupt superblock");
4181 brelse(bh);
4182 goto out_bdev;
4183 }
4184
617ba13b 4185 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
b31e1552 4186 ext4_msg(sb, KERN_ERR, "journal UUID does not match");
ac27a0ec
DK		 4187 brelse(bh);
4188 goto out_bdev;
4189 }
4190
bd81d8ee 4191 len = ext4_blocks_count(es);
ac27a0ec
DK		 4192 start = sb_block + 1;
4193 brelse(bh); /* we're done with the superblock */
4194
dab291af 4195 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
ac27a0ec
DK		 4196 start, len, blocksize);
4197 if (!journal) {
b31e1552 4198 ext4_msg(sb, KERN_ERR, "failed to create device journal");
ac27a0ec
DK		 4199 goto out_bdev;
4200 }
4201 journal->j_private = sb;
9f203507 4202 ll_rw_block(READ | REQ_META | REQ_PRIO, 1, &journal->j_sb_buffer);
ac27a0ec
DK		 4203 wait_on_buffer(journal->j_sb_buffer);
4204 if (!buffer_uptodate(journal->j_sb_buffer)) {
b31e1552 4205 ext4_msg(sb, KERN_ERR, "I/O error on journal device");
ac27a0ec
DK		 4206 goto out_journal;
4207 }
4208 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
b31e1552
ES		 4209 ext4_msg(sb, KERN_ERR, "External journal has more than one "
4210 "user (unsupported) - %d",
ac27a0ec
DK		 4211 be32_to_cpu(journal->j_superblock->s_nr_users));
4212 goto out_journal;
4213 }
617ba13b
MC		 4214 EXT4_SB(sb)->journal_bdev = bdev;
4215 ext4_init_journal_params(sb, journal);
ac27a0ec 4216 return journal;
0b8e58a1 4217
ac27a0ec 4218out_journal:
dab291af 4219 jbd2_journal_destroy(journal);
ac27a0ec 4220out_bdev:
617ba13b 4221 ext4_blkdev_put(bdev);
ac27a0ec
DK		 4222 return NULL;
4223}
4224
617ba13b
MC		 4225static int ext4_load_journal(struct super_block *sb,
4226 struct ext4_super_block *es,
ac27a0ec
DK		 4227 unsigned long journal_devnum)
4228{
4229 journal_t *journal;
4230 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
4231 dev_t journal_dev;
4232 int err = 0;
4233 int really_read_only;
4234
e2b911c5 4235 BUG_ON(!ext4_has_feature_journal(sb));
0390131b 4236
ac27a0ec
DK		 4237 if (journal_devnum &&
4238 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
b31e1552
ES		 4239 ext4_msg(sb, KERN_INFO, "external journal device major/minor "
4240 "numbers have changed");
ac27a0ec
DK		 4241 journal_dev = new_decode_dev(journal_devnum);
4242 } else
4243 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
4244
4245 really_read_only = bdev_read_only(sb->s_bdev);
4246
4247 /*
4248 * Are we loading a blank journal or performing recovery after a
4249 * crash? For recovery, we need to check in advance whether we
4250 * can get read-write access to the device.
4251 */
e2b911c5 4252 if (ext4_has_feature_journal_needs_recovery(sb)) {
ac27a0ec 4253 if (sb->s_flags & MS_RDONLY) {
b31e1552
ES		 4254 ext4_msg(sb, KERN_INFO, "INFO: recovery "
4255 "required on readonly filesystem");
ac27a0ec 4256 if (really_read_only) {
b31e1552
ES		 4257 ext4_msg(sb, KERN_ERR, "write access "
4258 "unavailable, cannot proceed");
ac27a0ec
DK		 4259 return -EROFS;
4260 }
b31e1552
ES		 4261 ext4_msg(sb, KERN_INFO, "write access will "
4262 "be enabled during recovery");
ac27a0ec
DK		 4263 }
4264 }
4265
4266 if (journal_inum && journal_dev) {
b31e1552
ES		 4267 ext4_msg(sb, KERN_ERR, "filesystem has both journal "
4268 "and inode journals!");
ac27a0ec
DK		 4269 return -EINVAL;
4270 }
4271
4272 if (journal_inum) {
617ba13b 4273 if (!(journal = ext4_get_journal(sb, journal_inum)))
ac27a0ec
DK		 4274 return -EINVAL;
4275 } else {
617ba13b 4276 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
ac27a0ec
DK		 4277 return -EINVAL;
4278 }
4279
90576c0b 4280 if (!(journal->j_flags & JBD2_BARRIER))
b31e1552 4281 ext4_msg(sb, KERN_INFO, "barriers disabled");
4776004f 4282
e2b911c5 4283 if (!ext4_has_feature_journal_needs_recovery(sb))
dab291af 4284 err = jbd2_journal_wipe(journal, !really_read_only);
1c13d5c0
TT		 4285 if (!err) {
4286 char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL);
4287 if (save)
4288 memcpy(save, ((char *) es) +
4289 EXT4_S_ERR_START, EXT4_S_ERR_LEN);
dab291af 4290 err = jbd2_journal_load(journal);
1c13d5c0
TT		 4291 if (save)
4292 memcpy(((char *) es) + EXT4_S_ERR_START,
4293 save, EXT4_S_ERR_LEN);
4294 kfree(save);
4295 }
ac27a0ec
DK		 4296
4297 if (err) {
b31e1552 4298 ext4_msg(sb, KERN_ERR, "error loading journal");
dab291af 4299 jbd2_journal_destroy(journal);
ac27a0ec
DK		 4300 return err;
4301 }
4302
617ba13b
MC		 4303 EXT4_SB(sb)->s_journal = journal;
4304 ext4_clear_journal_err(sb, es);
ac27a0ec 4305
c41303ce 4306 if (!really_read_only && journal_devnum &&
ac27a0ec
DK		 4307 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
4308 es->s_journal_dev = cpu_to_le32(journal_devnum);
ac27a0ec
DK		 4309
4310 /* Make sure we flush the recovery flag to disk. */
e2d67052 4311 ext4_commit_super(sb, 1);
ac27a0ec
DK		 4312 }
4313
4314 return 0;
4315}
4316
e2d67052 4317static int ext4_commit_super(struct super_block *sb, int sync)
ac27a0ec 4318{
e2d67052 4319 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
617ba13b 4320 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
c4be0c1d 4321 int error = 0;
ac27a0ec 4322
bdfe0cbd 4323 if (!sbh || block_device_ejected(sb))
c4be0c1d 4324 return error;
914258bf
TT		 4325 if (buffer_write_io_error(sbh)) {
4326 /*
4327 * Oh, dear. A previous attempt to write the
4328 * superblock failed. This could happen because the
4329 * USB device was yanked out. Or it could happen to
4330 * be a transient write error and maybe the block will
4331 * be remapped. Nothing we can do but to retry the
4332 * write and hope for the best.
4333 */
b31e1552
ES		 4334 ext4_msg(sb, KERN_ERR, "previous I/O error to "
4335 "superblock detected");
914258bf
TT		 4336 clear_buffer_write_io_error(sbh);
4337 set_buffer_uptodate(sbh);
4338 }
71290b36
TT		 4339 /*
4340 * If the file system is mounted read-only, don't update the
4341 * superblock write time. This avoids updating the superblock
4342 * write time when we are mounting the root file system
4343 * read/only but we need to replay the journal; at that point,
4344 * for people who are east of GMT and who make their clock
4345 * tick in localtime for Windows bug-for-bug compatibility,
4346 * the clock is set in the future, and this will cause e2fsck
4347 * to complain and force a full file system check.
4348 */
4349 if (!(sb->s_flags & MS_RDONLY))
4350 es->s_wtime = cpu_to_le32(get_seconds());
f613dfcb
TT		 4351 if (sb->s_bdev->bd_part)
4352 es->s_kbytes_written =
4353 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written +
afc32f7e
TT		 4354 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
4355 EXT4_SB(sb)->s_sectors_written_start) >> 1));
f613dfcb
TT		 4356 else
4357 es->s_kbytes_written =
4358 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written);
d5e03cbb
TT		 4359 if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeclusters_counter))
4360 ext4_free_blocks_count_set(es,
57042651
TT		 4361 EXT4_C2B(EXT4_SB(sb), percpu_counter_sum_positive(
4362 &EXT4_SB(sb)->s_freeclusters_counter)));
d5e03cbb
TT		 4363 if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeinodes_counter))
4364 es->s_free_inodes_count =
4365 cpu_to_le32(percpu_counter_sum_positive(
ce7e010a 4366 &EXT4_SB(sb)->s_freeinodes_counter));
ac27a0ec 4367 BUFFER_TRACE(sbh, "marking dirty");
06db49e6 4368 ext4_superblock_csum_set(sb);
ac27a0ec 4369 mark_buffer_dirty(sbh);
914258bf 4370 if (sync) {
564bc402
DJ		 4371 error = __sync_dirty_buffer(sbh,
4372 test_opt(sb, BARRIER) ? WRITE_FUA : WRITE_SYNC);
c4be0c1d
TS		 4373 if (error)
4374 return error;
4375
4376 error = buffer_write_io_error(sbh);
4377 if (error) {
b31e1552
ES		 4378 ext4_msg(sb, KERN_ERR, "I/O error while writing "
4379 "superblock");
914258bf
TT		 4380 clear_buffer_write_io_error(sbh);
4381 set_buffer_uptodate(sbh);
4382 }
4383 }
c4be0c1d 4384 return error;
ac27a0ec
DK		 4385}
4386
ac27a0ec
DK		 4387/*
4388 * Have we just finished recovery? If so, and if we are mounting (or
4389 * remounting) the filesystem readonly, then we will end up with a
4390 * consistent fs on disk. Record that fact.
4391 */
2b2d6d01
TT		 4392static void ext4_mark_recovery_complete(struct super_block *sb,
4393 struct ext4_super_block *es)
ac27a0ec 4394{
617ba13b 4395 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 4396
e2b911c5 4397 if (!ext4_has_feature_journal(sb)) {
0390131b
FM		 4398 BUG_ON(journal != NULL);
4399 return;
4400 }
dab291af 4401 jbd2_journal_lock_updates(journal);
7ffe1ea8
HK		 4402 if (jbd2_journal_flush(journal) < 0)
4403 goto out;
4404
e2b911c5 4405 if (ext4_has_feature_journal_needs_recovery(sb) &&
ac27a0ec 4406 sb->s_flags & MS_RDONLY) {
e2b911c5 4407 ext4_clear_feature_journal_needs_recovery(sb);
e2d67052 4408 ext4_commit_super(sb, 1);
ac27a0ec 4409 }
7ffe1ea8
HK		 4410
4411out:
dab291af 4412 jbd2_journal_unlock_updates(journal);
ac27a0ec
DK		 4413}
4414
4415/*
4416 * If we are mounting (or read-write remounting) a filesystem whose journal
4417 * has recorded an error from a previous lifetime, move that error to the
4418 * main filesystem now.
4419 */
2b2d6d01
TT		 4420static void ext4_clear_journal_err(struct super_block *sb,
4421 struct ext4_super_block *es)
ac27a0ec
DK		 4422{
4423 journal_t *journal;
4424 int j_errno;
4425 const char *errstr;
4426
e2b911c5 4427 BUG_ON(!ext4_has_feature_journal(sb));
0390131b 4428
617ba13b 4429 journal = EXT4_SB(sb)->s_journal;
ac27a0ec
DK		 4430
4431 /*
4432 * Now check for any error status which may have been recorded in the
617ba13b 4433 * journal by a prior ext4_error() or ext4_abort()
ac27a0ec
DK		 4434 */
4435
dab291af 4436 j_errno = jbd2_journal_errno(journal);
ac27a0ec
DK		 4437 if (j_errno) {
4438 char nbuf[16];
4439
617ba13b 4440 errstr = ext4_decode_error(sb, j_errno, nbuf);
12062ddd 4441 ext4_warning(sb, "Filesystem error recorded "
ac27a0ec 4442 "from previous mount: %s", errstr);
12062ddd 4443 ext4_warning(sb, "Marking fs in need of filesystem check.");
ac27a0ec 4444
617ba13b
MC		 4445 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
4446 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
e2d67052 4447 ext4_commit_super(sb, 1);
ac27a0ec 4448
dab291af 4449 jbd2_journal_clear_err(journal);
d796c52e 4450 jbd2_journal_update_sb_errno(journal);
ac27a0ec
DK		 4451 }
4452}
4453
4454/*
4455 * Force the running and committing transactions to commit,
4456 * and wait on the commit.
4457 */
617ba13b 4458int ext4_force_commit(struct super_block *sb)
ac27a0ec
DK		 4459{
4460 journal_t *journal;
ac27a0ec
DK		 4461
4462 if (sb->s_flags & MS_RDONLY)
4463 return 0;
4464
617ba13b 4465 journal = EXT4_SB(sb)->s_journal;
b1deefc9 4466 return ext4_journal_force_commit(journal);
ac27a0ec
DK		 4467}
4468
617ba13b 4469static int ext4_sync_fs(struct super_block *sb, int wait)
ac27a0ec 4470{
14ce0cb4 4471 int ret = 0;
9eddacf9 4472 tid_t target;
06a407f1 4473 bool needs_barrier = false;
8d5d02e6 4474 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4475
9bffad1e 4476 trace_ext4_sync_fs(sb, wait);
2e8fa54e 4477 flush_workqueue(sbi->rsv_conversion_wq);
a1177825
JK		 4478 /*
4479 * Writeback quota in non-journalled quota case - journalled quota has
4480 * no dirty dquots
4481 */
4482 dquot_writeback_dquots(sb, -1);
06a407f1
DM		 4483 /*
4484 * Data writeback is possible w/o journal transaction, so barrier must
4485 * being sent at the end of the function. But we can skip it if
4486 * transaction_commit will do it for us.
4487 */
bda32530
TT		 4488 if (sbi->s_journal) {
4489 target = jbd2_get_latest_transaction(sbi->s_journal);
4490 if (wait && sbi->s_journal->j_flags & JBD2_BARRIER &&
4491 !jbd2_trans_will_send_data_barrier(sbi->s_journal, target))
4492 needs_barrier = true;
4493
4494 if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
4495 if (wait)
4496 ret = jbd2_log_wait_commit(sbi->s_journal,
4497 target);
4498 }
4499 } else if (wait && test_opt(sb, BARRIER))
06a407f1 4500 needs_barrier = true;
06a407f1
DM		 4501 if (needs_barrier) {
4502 int err;
4503 err = blkdev_issue_flush(sb->s_bdev, GFP_KERNEL, NULL);
4504 if (!ret)
4505 ret = err;
0390131b 4506 }
06a407f1
DM		 4507
4508 return ret;
4509}
4510
ac27a0ec
DK		 4511/*
4512 * LVM calls this function before a (read-only) snapshot is created. This
4513 * gives us a chance to flush the journal completely and mark the fs clean.
be4f27d3
YY		 4514 *
4515 * Note that only this function cannot bring a filesystem to be in a clean
8e8ad8a5
JK		 4516 * state independently. It relies on upper layer to stop all data & metadata
4517 * modifications.
ac27a0ec 4518 */
c4be0c1d 4519static int ext4_freeze(struct super_block *sb)
ac27a0ec 4520{
c4be0c1d
TS		 4521 int error = 0;
4522 journal_t *journal;
ac27a0ec 4523
9ca92389
TT		 4524 if (sb->s_flags & MS_RDONLY)
4525 return 0;
ac27a0ec 4526
9ca92389 4527 journal = EXT4_SB(sb)->s_journal;
7ffe1ea8 4528
bb044576
TT		 4529 if (journal) {
4530 /* Now we set up the journal barrier. */
4531 jbd2_journal_lock_updates(journal);
ac27a0ec 4532
bb044576
TT		 4533 /*
4534 * Don't clear the needs_recovery flag if we failed to
4535 * flush the journal.
4536 */
4537 error = jbd2_journal_flush(journal);
4538 if (error < 0)
4539 goto out;
c642dc9e
ES		 4540
4541 /* Journal blocked and flushed, clear needs_recovery flag. */
e2b911c5 4542 ext4_clear_feature_journal_needs_recovery(sb);
bb044576 4543 }
9ca92389 4544
9ca92389 4545 error = ext4_commit_super(sb, 1);
6b0310fb 4546out:
bb044576
TT		 4547 if (journal)
4548 /* we rely on upper layer to stop further updates */
4549 jbd2_journal_unlock_updates(journal);
6b0310fb 4550 return error;
ac27a0ec
DK		 4551}
4552
4553/*
4554 * Called by LVM after the snapshot is done. We need to reset the RECOVER
4555 * flag here, even though the filesystem is not technically dirty yet.
4556 */
c4be0c1d 4557static int ext4_unfreeze(struct super_block *sb)
ac27a0ec 4558{
9ca92389
TT		 4559 if (sb->s_flags & MS_RDONLY)
4560 return 0;
4561
c642dc9e
ES		 4562 if (EXT4_SB(sb)->s_journal) {
4563 /* Reset the needs_recovery flag before the fs is unlocked. */
e2b911c5 4564 ext4_set_feature_journal_needs_recovery(sb);
c642dc9e
ES		 4565 }
4566
9ca92389 4567 ext4_commit_super(sb, 1);
c4be0c1d 4568 return 0;
ac27a0ec
DK		 4569}
4570
673c6100
TT		 4571/*
4572 * Structure to save mount options for ext4_remount's benefit
4573 */
4574struct ext4_mount_options {
4575 unsigned long s_mount_opt;
a2595b8a 4576 unsigned long s_mount_opt2;
08cefc7a
EB		 4577 kuid_t s_resuid;
4578 kgid_t s_resgid;
673c6100
TT		 4579 unsigned long s_commit_interval;
4580 u32 s_min_batch_time, s_max_batch_time;
4581#ifdef CONFIG_QUOTA
4582 int s_jquota_fmt;
a2d4a646 4583 char *s_qf_names[EXT4_MAXQUOTAS];
673c6100
TT		 4584#endif
4585};
4586
2b2d6d01 4587static int ext4_remount(struct super_block *sb, int *flags, char *data)
ac27a0ec 4588{
2b2d6d01 4589 struct ext4_super_block *es;
617ba13b 4590 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4591 unsigned long old_sb_flags;
617ba13b 4592 struct ext4_mount_options old_opts;
c79d967d 4593 int enable_quota = 0;
8a266467 4594 ext4_group_t g;
b3881f74 4595 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
c5e06d10 4596 int err = 0;
ac27a0ec 4597#ifdef CONFIG_QUOTA
03dafb5f 4598 int i, j;
ac27a0ec 4599#endif
d4c402d9 4600 char *orig_data = kstrdup(data, GFP_KERNEL);
ac27a0ec
DK		 4601
4602 /* Store the original options */
4603 old_sb_flags = sb->s_flags;
4604 old_opts.s_mount_opt = sbi->s_mount_opt;
a2595b8a 4605 old_opts.s_mount_opt2 = sbi->s_mount_opt2;
ac27a0ec
DK		 4606 old_opts.s_resuid = sbi->s_resuid;
4607 old_opts.s_resgid = sbi->s_resgid;
4608 old_opts.s_commit_interval = sbi->s_commit_interval;
30773840
TT		 4609 old_opts.s_min_batch_time = sbi->s_min_batch_time;
4610 old_opts.s_max_batch_time = sbi->s_max_batch_time;
ac27a0ec
DK		 4611#ifdef CONFIG_QUOTA
4612 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
a2d4a646 4613 for (i = 0; i < EXT4_MAXQUOTAS; i++)
03dafb5f
CG		 4614 if (sbi->s_qf_names[i]) {
4615 old_opts.s_qf_names[i] = kstrdup(sbi->s_qf_names[i],
4616 GFP_KERNEL);
4617 if (!old_opts.s_qf_names[i]) {
4618 for (j = 0; j < i; j++)
4619 kfree(old_opts.s_qf_names[j]);
3e36a163 4620 kfree(orig_data);
03dafb5f
CG		 4621 return -ENOMEM;
4622 }
4623 } else
4624 old_opts.s_qf_names[i] = NULL;
ac27a0ec 4625#endif
b3881f74
TT		 4626 if (sbi->s_journal && sbi->s_journal->j_task->io_context)
4627 journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
ac27a0ec 4628
661aa520 4629 if (!parse_options(data, sb, NULL, &journal_ioprio, 1)) {
ac27a0ec
DK		 4630 err = -EINVAL;
4631 goto restore_opts;
4632 }
4633
6b992ff2 4634 if ((old_opts.s_mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) ^
c6d3d56d
DW		 4635 test_opt(sb, JOURNAL_CHECKSUM)) {
4636 ext4_msg(sb, KERN_ERR, "changing journal_checksum "
2d5b86e0
ES		 4637 "during remount not supported; ignoring");
4638 sbi->s_mount_opt ^= EXT4_MOUNT_JOURNAL_CHECKSUM;
6b992ff2
DW		 4639 }
4640
6ae6514b
PS		 4641 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
4642 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
4643 ext4_msg(sb, KERN_ERR, "can't mount with "
4644 "both data=journal and delalloc");
4645 err = -EINVAL;
4646 goto restore_opts;
4647 }
4648 if (test_opt(sb, DIOREAD_NOLOCK)) {
4649 ext4_msg(sb, KERN_ERR, "can't mount with "
4650 "both data=journal and dioread_nolock");
4651 err = -EINVAL;
4652 goto restore_opts;
4653 }
923ae0ff
RZ		 4654 if (test_opt(sb, DAX)) {
4655 ext4_msg(sb, KERN_ERR, "can't mount with "
4656 "both data=journal and dax");
4657 err = -EINVAL;
4658 goto restore_opts;
4659 }
4660 }
4661
4662 if ((sbi->s_mount_opt ^ old_opts.s_mount_opt) & EXT4_MOUNT_DAX) {
4663 ext4_msg(sb, KERN_WARNING, "warning: refusing change of "
4664 "dax flag with busy inodes while remounting");
4665 sbi->s_mount_opt ^= EXT4_MOUNT_DAX;
6ae6514b
PS		 4666 }
4667
4ab2f15b 4668 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
c67d859e 4669 ext4_abort(sb, "Abort forced by user");
ac27a0ec
DK		 4670
4671 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
482a7425 4672 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec
DK		 4673
4674 es = sbi->s_es;
4675
b3881f74 4676 if (sbi->s_journal) {
0390131b 4677 ext4_init_journal_params(sb, sbi->s_journal);
b3881f74
TT		 4678 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
4679 }
ac27a0ec 4680
a2fd66d0
TT		 4681 if (*flags & MS_LAZYTIME)
4682 sb->s_flags |= MS_LAZYTIME;
4683
661aa520 4684 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
4ab2f15b 4685 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) {
ac27a0ec
DK		 4686 err = -EROFS;
4687 goto restore_opts;
4688 }
4689
4690 if (*flags & MS_RDONLY) {
38c03b34
TT		 4691 err = sync_filesystem(sb);
4692 if (err < 0)
4693 goto restore_opts;
0f0dd62f
CH		 4694 err = dquot_suspend(sb, -1);
4695 if (err < 0)
c79d967d 4696 goto restore_opts;
c79d967d 4697
ac27a0ec
DK		 4698 /*
4699 * First of all, the unconditional stuff we have to do
4700 * to disable replay of the journal when we next remount
4701 */
4702 sb->s_flags |= MS_RDONLY;
4703
4704 /*
4705 * OK, test if we are remounting a valid rw partition
4706 * readonly, and if so set the rdonly flag and then
4707 * mark the partition as valid again.
4708 */
617ba13b
MC		 4709 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
4710 (sbi->s_mount_state & EXT4_VALID_FS))
ac27a0ec
DK		 4711 es->s_state = cpu_to_le16(sbi->s_mount_state);
4712
a63c9eb2 4713 if (sbi->s_journal)
0390131b 4714 ext4_mark_recovery_complete(sb, es);
ac27a0ec 4715 } else {
a13fb1a4 4716 /* Make sure we can mount this feature set readwrite */
e2b911c5 4717 if (ext4_has_feature_readonly(sb) ||
2cb5cc8b 4718 !ext4_feature_set_ok(sb, 0)) {
ac27a0ec
DK		 4719 err = -EROFS;
4720 goto restore_opts;
4721 }
8a266467
TT		 4722 /*
4723 * Make sure the group descriptor checksums
0b8e58a1 4724 * are sane. If they aren't, refuse to remount r/w.
8a266467
TT		 4725 */
4726 for (g = 0; g < sbi->s_groups_count; g++) {
4727 struct ext4_group_desc *gdp =
4728 ext4_get_group_desc(sb, g, NULL);
4729
feb0ab32 4730 if (!ext4_group_desc_csum_verify(sb, g, gdp)) {
b31e1552
ES		 4731 ext4_msg(sb, KERN_ERR,
4732 "ext4_remount: Checksum for group %u failed (%u!=%u)",
e2b911c5 4733 g, le16_to_cpu(ext4_group_desc_csum(sb, g, gdp)),
8a266467 4734 le16_to_cpu(gdp->bg_checksum));
6a797d27 4735 err = -EFSBADCRC;
8a266467
TT		 4736 goto restore_opts;
4737 }
4738 }
4739
ead6596b
ES		 4740 /*
4741 * If we have an unprocessed orphan list hanging
4742 * around from a previously readonly bdev mount,
4743 * require a full umount/remount for now.
4744 */
4745 if (es->s_last_orphan) {
b31e1552 4746 ext4_msg(sb, KERN_WARNING, "Couldn't "
ead6596b
ES		 4747 "remount RDWR because of unprocessed "
4748 "orphan inode list. Please "
b31e1552 4749 "umount/remount instead");
ead6596b
ES		 4750 err = -EINVAL;
4751 goto restore_opts;
4752 }
4753
ac27a0ec
DK		 4754 /*
4755 * Mounting a RDONLY partition read-write, so reread
4756 * and store the current valid flag. (It may have
4757 * been changed by e2fsck since we originally mounted
4758 * the partition.)
4759 */
0390131b
FM		 4760 if (sbi->s_journal)
4761 ext4_clear_journal_err(sb, es);
ac27a0ec 4762 sbi->s_mount_state = le16_to_cpu(es->s_state);
2b2d6d01 4763 if (!ext4_setup_super(sb, es, 0))
ac27a0ec 4764 sb->s_flags &= ~MS_RDONLY;
e2b911c5 4765 if (ext4_has_feature_mmp(sb))
c5e06d10
JL		 4766 if (ext4_multi_mount_protect(sb,
4767 le64_to_cpu(es->s_mmp_block))) {
4768 err = -EROFS;
4769 goto restore_opts;
4770 }
c79d967d 4771 enable_quota = 1;
ac27a0ec
DK		 4772 }
4773 }
bfff6873
LC		 4774
4775 /*
4776 * Reinitialize lazy itable initialization thread based on
4777 * current settings
4778 */
4779 if ((sb->s_flags & MS_RDONLY) || !test_opt(sb, INIT_INODE_TABLE))
4780 ext4_unregister_li_request(sb);
4781 else {
4782 ext4_group_t first_not_zeroed;
4783 first_not_zeroed = ext4_has_uninit_itable(sb);
4784 ext4_register_li_request(sb, first_not_zeroed);
4785 }
4786
6fd058f7 4787 ext4_setup_system_zone(sb);
d096ad0f 4788 if (sbi->s_journal == NULL && !(old_sb_flags & MS_RDONLY))
e2d67052 4789 ext4_commit_super(sb, 1);
0390131b 4790
ac27a0ec
DK		 4791#ifdef CONFIG_QUOTA
4792 /* Release old quota file names */
a2d4a646 4793 for (i = 0; i < EXT4_MAXQUOTAS; i++)
03dafb5f 4794 kfree(old_opts.s_qf_names[i]);
7c319d32
AK		 4795 if (enable_quota) {
4796 if (sb_any_quota_suspended(sb))
4797 dquot_resume(sb, -1);
e2b911c5 4798 else if (ext4_has_feature_quota(sb)) {
7c319d32 4799 err = ext4_enable_quotas(sb);
07724f98 4800 if (err)
7c319d32 4801 goto restore_opts;
7c319d32
AK		 4802 }
4803 }
ac27a0ec 4804#endif
d4c402d9 4805
a26f4992 4806 *flags = (*flags & ~MS_LAZYTIME) | (sb->s_flags & MS_LAZYTIME);
d4c402d9
CW		 4807 ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s", orig_data);
4808 kfree(orig_data);
ac27a0ec 4809 return 0;
0b8e58a1 4810
ac27a0ec
DK		 4811restore_opts:
4812 sb->s_flags = old_sb_flags;
4813 sbi->s_mount_opt = old_opts.s_mount_opt;
a2595b8a 4814 sbi->s_mount_opt2 = old_opts.s_mount_opt2;
ac27a0ec
DK		 4815 sbi->s_resuid = old_opts.s_resuid;
4816 sbi->s_resgid = old_opts.s_resgid;
4817 sbi->s_commit_interval = old_opts.s_commit_interval;
30773840
TT		 4818 sbi->s_min_batch_time = old_opts.s_min_batch_time;
4819 sbi->s_max_batch_time = old_opts.s_max_batch_time;
ac27a0ec
DK		 4820#ifdef CONFIG_QUOTA
4821 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
a2d4a646 4822 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
03dafb5f 4823 kfree(sbi->s_qf_names[i]);
ac27a0ec
DK		 4824 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
4825 }
4826#endif
d4c402d9 4827 kfree(orig_data);
ac27a0ec
DK		 4828 return err;
4829}
4830
689c958c
LX		 4831#ifdef CONFIG_QUOTA
4832static int ext4_statfs_project(struct super_block *sb,
4833 kprojid_t projid, struct kstatfs *buf)
4834{
4835 struct kqid qid;
4836 struct dquot *dquot;
4837 u64 limit;
4838 u64 curblock;
4839
4840 qid = make_kqid_projid(projid);
4841 dquot = dqget(sb, qid);
4842 if (IS_ERR(dquot))
4843 return PTR_ERR(dquot);
4844 spin_lock(&dq_data_lock);
4845
4846 limit = (dquot->dq_dqb.dqb_bsoftlimit ?
4847 dquot->dq_dqb.dqb_bsoftlimit :
4848 dquot->dq_dqb.dqb_bhardlimit) >> sb->s_blocksize_bits;
4849 if (limit && buf->f_blocks > limit) {
4850 curblock = dquot->dq_dqb.dqb_curspace >> sb->s_blocksize_bits;
4851 buf->f_blocks = limit;
4852 buf->f_bfree = buf->f_bavail =
4853 (buf->f_blocks > curblock) ?
4854 (buf->f_blocks - curblock) : 0;
4855 }
4856
4857 limit = dquot->dq_dqb.dqb_isoftlimit ?
4858 dquot->dq_dqb.dqb_isoftlimit :
4859 dquot->dq_dqb.dqb_ihardlimit;
4860 if (limit && buf->f_files > limit) {
4861 buf->f_files = limit;
4862 buf->f_ffree =
4863 (buf->f_files > dquot->dq_dqb.dqb_curinodes) ?
4864 (buf->f_files - dquot->dq_dqb.dqb_curinodes) : 0;
4865 }
4866
4867 spin_unlock(&dq_data_lock);
4868 dqput(dquot);
4869 return 0;
4870}
4871#endif
4872
2b2d6d01 4873static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
ac27a0ec
DK		 4874{
4875 struct super_block *sb = dentry->d_sb;
617ba13b
MC		 4876 struct ext4_sb_info *sbi = EXT4_SB(sb);
4877 struct ext4_super_block *es = sbi->s_es;
27dd4385 4878 ext4_fsblk_t overhead = 0, resv_blocks;
960cc398 4879 u64 fsid;
d02a9391 4880 s64 bfree;
27dd4385 4881 resv_blocks = EXT4_C2B(sbi, atomic64_read(&sbi->s_resv_clusters));
ac27a0ec 4882
952fc18e
TT		 4883 if (!test_opt(sb, MINIX_DF))
4884 overhead = sbi->s_overhead;
ac27a0ec 4885
617ba13b 4886 buf->f_type = EXT4_SUPER_MAGIC;
ac27a0ec 4887 buf->f_bsize = sb->s_blocksize;
b72f78cb 4888 buf->f_blocks = ext4_blocks_count(es) - EXT4_C2B(sbi, overhead);
57042651
TT		 4889 bfree = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) -
4890 percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter);
d02a9391 4891 /* prevent underflow in case that few free space is available */
57042651 4892 buf->f_bfree = EXT4_C2B(sbi, max_t(s64, bfree, 0));
27dd4385
LC		 4893 buf->f_bavail = buf->f_bfree -
4894 (ext4_r_blocks_count(es) + resv_blocks);
4895 if (buf->f_bfree < (ext4_r_blocks_count(es) + resv_blocks))
ac27a0ec
DK		 4896 buf->f_bavail = 0;
4897 buf->f_files = le32_to_cpu(es->s_inodes_count);
52d9f3b4 4898 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
617ba13b 4899 buf->f_namelen = EXT4_NAME_LEN;
960cc398
PE		 4900 fsid = le64_to_cpup((void *)es->s_uuid) ^
4901 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
4902 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
4903 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
0b8e58a1 4904
689c958c
LX		 4905#ifdef CONFIG_QUOTA
4906 if (ext4_test_inode_flag(dentry->d_inode, EXT4_INODE_PROJINHERIT) &&
4907 sb_has_quota_limits_enabled(sb, PRJQUOTA))
4908 ext4_statfs_project(sb, EXT4_I(dentry->d_inode)->i_projid, buf);
4909#endif
ac27a0ec
DK		 4910 return 0;
4911}
4912
0b8e58a1
AD		 4913/* Helper function for writing quotas on sync - we need to start transaction
4914 * before quota file is locked for write. Otherwise the are possible deadlocks:
ac27a0ec 4915 * Process 1 Process 2
617ba13b 4916 * ext4_create() quota_sync()
a269eb18 4917 * jbd2_journal_start() write_dquot()
871a2931 4918 * dquot_initialize() down(dqio_mutex)
dab291af 4919 * down(dqio_mutex) jbd2_journal_start()
ac27a0ec
DK		 4920 *
4921 */
4922
4923#ifdef CONFIG_QUOTA
4924
4925static inline struct inode *dquot_to_inode(struct dquot *dquot)
4926{
4c376dca 4927 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_id.type];
ac27a0ec
DK		 4928}
4929
617ba13b 4930static int ext4_write_dquot(struct dquot *dquot)
ac27a0ec
DK		 4931{
4932 int ret, err;
4933 handle_t *handle;
4934 struct inode *inode;
4935
4936 inode = dquot_to_inode(dquot);
9924a92a 4937 handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
0b8e58a1 4938 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 4939 if (IS_ERR(handle))
4940 return PTR_ERR(handle);
4941 ret = dquot_commit(dquot);
617ba13b 4942 err = ext4_journal_stop(handle);
ac27a0ec
DK		 4943 if (!ret)
4944 ret = err;
4945 return ret;
4946}
4947
617ba13b 4948static int ext4_acquire_dquot(struct dquot *dquot)
ac27a0ec
DK		 4949{
4950 int ret, err;
4951 handle_t *handle;
4952
9924a92a 4953 handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
0b8e58a1 4954 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 4955 if (IS_ERR(handle))
4956 return PTR_ERR(handle);
4957 ret = dquot_acquire(dquot);
617ba13b 4958 err = ext4_journal_stop(handle);
ac27a0ec
DK		 4959 if (!ret)
4960 ret = err;
4961 return ret;
4962}
4963
617ba13b 4964static int ext4_release_dquot(struct dquot *dquot)
ac27a0ec
DK		 4965{
4966 int ret, err;
4967 handle_t *handle;
4968
9924a92a 4969 handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
0b8e58a1 4970 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
9c3013e9
JK		 4971 if (IS_ERR(handle)) {
4972 /* Release dquot anyway to avoid endless cycle in dqput() */
4973 dquot_release(dquot);
ac27a0ec 4974 return PTR_ERR(handle);
9c3013e9 4975 }
ac27a0ec 4976 ret = dquot_release(dquot);
617ba13b 4977 err = ext4_journal_stop(handle);
ac27a0ec
DK		 4978 if (!ret)
4979 ret = err;
4980 return ret;
4981}
4982
617ba13b 4983static int ext4_mark_dquot_dirty(struct dquot *dquot)
ac27a0ec 4984{
262b4662
JK		 4985 struct super_block *sb = dquot->dq_sb;
4986 struct ext4_sb_info *sbi = EXT4_SB(sb);
4987
2c8be6b2 4988 /* Are we journaling quotas? */
e2b911c5 4989 if (ext4_has_feature_quota(sb) ||
262b4662 4990 sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
ac27a0ec 4991 dquot_mark_dquot_dirty(dquot);
617ba13b 4992 return ext4_write_dquot(dquot);
ac27a0ec
DK		 4993 } else {
4994 return dquot_mark_dquot_dirty(dquot);
4995 }
4996}
4997
617ba13b 4998static int ext4_write_info(struct super_block *sb, int type)
ac27a0ec
DK		 4999{
5000 int ret, err;
5001 handle_t *handle;
5002
5003 /* Data block + inode block */
2b0143b5 5004 handle = ext4_journal_start(d_inode(sb->s_root), EXT4_HT_QUOTA, 2);
ac27a0ec
DK		 5005 if (IS_ERR(handle))
5006 return PTR_ERR(handle);
5007 ret = dquot_commit_info(sb, type);
617ba13b 5008 err = ext4_journal_stop(handle);
ac27a0ec
DK		 5009 if (!ret)
5010 ret = err;
5011 return ret;
5012}
5013
5014/*
5015 * Turn on quotas during mount time - we need to find
5016 * the quota file and such...
5017 */
617ba13b 5018static int ext4_quota_on_mount(struct super_block *sb, int type)
ac27a0ec 5019{
287a8095
CH		 5020 return dquot_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
5021 EXT4_SB(sb)->s_jquota_fmt, type);
ac27a0ec
DK		 5022}
5023
5024/*
5025 * Standard function to be called on quota_on
5026 */
617ba13b 5027static int ext4_quota_on(struct super_block *sb, int type, int format_id,
f00c9e44 5028 struct path *path)
ac27a0ec
DK		 5029{
5030 int err;
ac27a0ec
DK		 5031
5032 if (!test_opt(sb, QUOTA))
5033 return -EINVAL;
0623543b 5034
ac27a0ec 5035 /* Quotafile not on the same filesystem? */
d8c9584e 5036 if (path->dentry->d_sb != sb)
ac27a0ec 5037 return -EXDEV;
0623543b
JK		 5038 /* Journaling quota? */
5039 if (EXT4_SB(sb)->s_qf_names[type]) {
2b2d6d01 5040 /* Quotafile not in fs root? */
f00c9e44 5041 if (path->dentry->d_parent != sb->s_root)
b31e1552
ES		 5042 ext4_msg(sb, KERN_WARNING,
5043 "Quota file not on filesystem root. "
5044 "Journaled quota will not work");
2b2d6d01 5045 }
0623543b
JK		 5046
5047 /*
5048 * When we journal data on quota file, we have to flush journal to see
5049 * all updates to the file when we bypass pagecache...
5050 */
0390131b 5051 if (EXT4_SB(sb)->s_journal &&
2b0143b5 5052 ext4_should_journal_data(d_inode(path->dentry))) {
0623543b
JK		 5053 /*
5054 * We don't need to lock updates but journal_flush() could
5055 * otherwise be livelocked...
5056 */
5057 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
7ffe1ea8 5058 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
0623543b 5059 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
f00c9e44 5060 if (err)
7ffe1ea8 5061 return err;
0623543b
JK		 5062 }
5063
f00c9e44 5064 return dquot_quota_on(sb, type, format_id, path);
ac27a0ec
DK		 5065}
5066
7c319d32
AK		 5067static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
5068 unsigned int flags)
5069{
5070 int err;
5071 struct inode *qf_inode;
a2d4a646 5072 unsigned long qf_inums[EXT4_MAXQUOTAS] = {
7c319d32 5073 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
689c958c
LX		 5074 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum),
5075 le32_to_cpu(EXT4_SB(sb)->s_es->s_prj_quota_inum)
7c319d32
AK		 5076 };
5077
e2b911c5 5078 BUG_ON(!ext4_has_feature_quota(sb));
7c319d32
AK		 5079
5080 if (!qf_inums[type])
5081 return -EPERM;
5082
5083 qf_inode = ext4_iget(sb, qf_inums[type]);
5084 if (IS_ERR(qf_inode)) {
5085 ext4_error(sb, "Bad quota inode # %lu", qf_inums[type]);
5086 return PTR_ERR(qf_inode);
5087 }
5088
bcb13850
JK		 5089 /* Don't account quota for quota files to avoid recursion */
5090 qf_inode->i_flags |= S_NOQUOTA;
7c319d32
AK		 5091 err = dquot_enable(qf_inode, type, format_id, flags);
5092 iput(qf_inode);
5093
5094 return err;
5095}
5096
5097/* Enable usage tracking for all quota types. */
5098static int ext4_enable_quotas(struct super_block *sb)
5099{
5100 int type, err = 0;
a2d4a646 5101 unsigned long qf_inums[EXT4_MAXQUOTAS] = {
7c319d32 5102 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
689c958c
LX		 5103 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum),
5104 le32_to_cpu(EXT4_SB(sb)->s_es->s_prj_quota_inum)
7c319d32
AK		 5105 };
5106
5107 sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE;
a2d4a646 5108 for (type = 0; type < EXT4_MAXQUOTAS; type++) {
7c319d32
AK		 5109 if (qf_inums[type]) {
5110 err = ext4_quota_enable(sb, type, QFMT_VFS_V1,
5111 DQUOT_USAGE_ENABLED);
5112 if (err) {
5113 ext4_warning(sb,
72ba7450
TT		 5114 "Failed to enable quota tracking "
5115 "(type=%d, err=%d). Please run "
5116 "e2fsck to fix.", type, err);
7c319d32
AK		 5117 return err;
5118 }
5119 }
5120 }
5121 return 0;
5122}
5123
ca0e05e4
DM		 5124static int ext4_quota_off(struct super_block *sb, int type)
5125{
21f97697
JK		 5126 struct inode *inode = sb_dqopt(sb)->files[type];
5127 handle_t *handle;
5128
87009d86
DM		 5129 /* Force all delayed allocation blocks to be allocated.
5130 * Caller already holds s_umount sem */
5131 if (test_opt(sb, DELALLOC))
ca0e05e4 5132 sync_filesystem(sb);
ca0e05e4 5133
0b268590
AG		 5134 if (!inode)
5135 goto out;
5136
21f97697
JK		 5137 /* Update modification times of quota files when userspace can
5138 * start looking at them */
9924a92a 5139 handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1);
21f97697
JK		 5140 if (IS_ERR(handle))
5141 goto out;
5142 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
5143 ext4_mark_inode_dirty(handle, inode);
5144 ext4_journal_stop(handle);
5145
5146out:
ca0e05e4
DM		 5147 return dquot_quota_off(sb, type);
5148}
5149
ac27a0ec
DK		 5150/* Read data from quotafile - avoid pagecache and such because we cannot afford
5151 * acquiring the locks... As quota files are never truncated and quota code
25985edc 5152 * itself serializes the operations (and no one else should touch the files)
ac27a0ec 5153 * we don't have to be afraid of races */
617ba13b 5154static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec
DK		 5155 size_t len, loff_t off)
5156{
5157 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 5158 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 5159 int offset = off & (sb->s_blocksize - 1);
5160 int tocopy;
5161 size_t toread;
5162 struct buffer_head *bh;
5163 loff_t i_size = i_size_read(inode);
5164
5165 if (off > i_size)
5166 return 0;
5167 if (off+len > i_size)
5168 len = i_size-off;
5169 toread = len;
5170 while (toread > 0) {
5171 tocopy = sb->s_blocksize - offset < toread ?
5172 sb->s_blocksize - offset : toread;
1c215028
TT		 5173 bh = ext4_bread(NULL, inode, blk, 0);
5174 if (IS_ERR(bh))
5175 return PTR_ERR(bh);
ac27a0ec
DK		 5176 if (!bh) /* A hole? */
5177 memset(data, 0, tocopy);
5178 else
5179 memcpy(data, bh->b_data+offset, tocopy);
5180 brelse(bh);
5181 offset = 0;
5182 toread -= tocopy;
5183 data += tocopy;
5184 blk++;
5185 }
5186 return len;
5187}
5188
5189/* Write to quotafile (we know the transaction is already started and has
5190 * enough credits) */
617ba13b 5191static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec
DK		 5192 const char *data, size_t len, loff_t off)
5193{
5194 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 5195 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
1c215028 5196 int err, offset = off & (sb->s_blocksize - 1);
c5e298ae 5197 int retries = 0;
ac27a0ec
DK		 5198 struct buffer_head *bh;
5199 handle_t *handle = journal_current_handle();
5200
0390131b 5201 if (EXT4_SB(sb)->s_journal && !handle) {
b31e1552
ES		 5202 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
5203 " cancelled because transaction is not started",
9c3013e9
JK		 5204 (unsigned long long)off, (unsigned long long)len);
5205 return -EIO;
5206 }
67eeb568
DM		 5207 /*
5208 * Since we account only one data block in transaction credits,
5209 * then it is impossible to cross a block boundary.
5210 */
5211 if (sb->s_blocksize - offset < len) {
5212 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
5213 " cancelled because not block aligned",
5214 (unsigned long long)off, (unsigned long long)len);
5215 return -EIO;
5216 }
5217
c5e298ae
TT		 5218 do {
5219 bh = ext4_bread(handle, inode, blk,
5220 EXT4_GET_BLOCKS_CREATE |
5221 EXT4_GET_BLOCKS_METADATA_NOFAIL);
5222 } while (IS_ERR(bh) && (PTR_ERR(bh) == -ENOSPC) &&
5223 ext4_should_retry_alloc(inode->i_sb, &retries));
1c215028
TT		 5224 if (IS_ERR(bh))
5225 return PTR_ERR(bh);
67eeb568
DM		 5226 if (!bh)
5227 goto out;
5d601255 5228 BUFFER_TRACE(bh, "get write access");
62d2b5f2
JK		 5229 err = ext4_journal_get_write_access(handle, bh);
5230 if (err) {
5231 brelse(bh);
1c215028 5232 return err;
ac27a0ec 5233 }
67eeb568
DM		 5234 lock_buffer(bh);
5235 memcpy(bh->b_data+offset, data, len);
5236 flush_dcache_page(bh->b_page);
5237 unlock_buffer(bh);
62d2b5f2 5238 err = ext4_handle_dirty_metadata(handle, NULL, bh);
67eeb568 5239 brelse(bh);
ac27a0ec 5240out:
67eeb568
DM		 5241 if (inode->i_size < off + len) {
5242 i_size_write(inode, off + len);
617ba13b 5243 EXT4_I(inode)->i_disksize = inode->i_size;
21f97697 5244 ext4_mark_inode_dirty(handle, inode);
ac27a0ec 5245 }
67eeb568 5246 return len;
ac27a0ec
DK		 5247}
5248
5249#endif
5250
152a0836
AV		 5251static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
5252 const char *dev_name, void *data)
ac27a0ec 5253{
152a0836 5254 return mount_bdev(fs_type, flags, dev_name, data, ext4_fill_super);
ac27a0ec
DK		 5255}
5256
c290ea01 5257#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2)
24b58424
TT		 5258static inline void register_as_ext2(void)
5259{
5260 int err = register_filesystem(&ext2_fs_type);
5261 if (err)
5262 printk(KERN_WARNING
5263 "EXT4-fs: Unable to register as ext2 (%d)\n", err);
5264}
5265
5266static inline void unregister_as_ext2(void)
5267{
5268 unregister_filesystem(&ext2_fs_type);
5269}
2035e776
TT		 5270
5271static inline int ext2_feature_set_ok(struct super_block *sb)
5272{
e2b911c5 5273 if (ext4_has_unknown_ext2_incompat_features(sb))
2035e776
TT		 5274 return 0;
5275 if (sb->s_flags & MS_RDONLY)
5276 return 1;
e2b911c5 5277 if (ext4_has_unknown_ext2_ro_compat_features(sb))
2035e776
TT		 5278 return 0;
5279 return 1;
5280}
24b58424
TT		 5281#else
5282static inline void register_as_ext2(void) { }
5283static inline void unregister_as_ext2(void) { }
2035e776 5284static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; }
24b58424
TT		 5285#endif
5286
24b58424
TT		 5287static inline void register_as_ext3(void)
5288{
5289 int err = register_filesystem(&ext3_fs_type);
5290 if (err)
5291 printk(KERN_WARNING
5292 "EXT4-fs: Unable to register as ext3 (%d)\n", err);
5293}
5294
5295static inline void unregister_as_ext3(void)
5296{
5297 unregister_filesystem(&ext3_fs_type);
5298}
2035e776
TT		 5299
5300static inline int ext3_feature_set_ok(struct super_block *sb)
5301{
e2b911c5 5302 if (ext4_has_unknown_ext3_incompat_features(sb))
2035e776 5303 return 0;
e2b911c5 5304 if (!ext4_has_feature_journal(sb))
2035e776
TT		 5305 return 0;
5306 if (sb->s_flags & MS_RDONLY)
5307 return 1;
e2b911c5 5308 if (ext4_has_unknown_ext3_ro_compat_features(sb))
2035e776
TT		 5309 return 0;
5310 return 1;
5311}
24b58424 5312
03010a33
TT		 5313static struct file_system_type ext4_fs_type = {
5314 .owner = THIS_MODULE,
5315 .name = "ext4",
152a0836 5316 .mount = ext4_mount,
03010a33
TT		 5317 .kill_sb = kill_block_super,
5318 .fs_flags = FS_REQUIRES_DEV,
5319};
7f78e035 5320MODULE_ALIAS_FS("ext4");
03010a33 5321
e9e3bcec
ES		 5322/* Shared across all ext4 file systems */
5323wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
5324struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ];
5325
5dabfc78 5326static int __init ext4_init_fs(void)
ac27a0ec 5327{
e9e3bcec 5328 int i, err;
c9de560d 5329
e294a537 5330 ratelimit_state_init(&ext4_mount_msg_ratelimit, 30 * HZ, 64);
07c0c5d8
AV		 5331 ext4_li_info = NULL;
5332 mutex_init(&ext4_li_mtx);
5333
9a4c8019 5334 /* Build-time check for flags consistency */
12e9b892 5335 ext4_check_flag_values();
e9e3bcec
ES		 5336
5337 for (i = 0; i < EXT4_WQ_HASH_SZ; i++) {
5338 mutex_init(&ext4__aio_mutex[i]);
5339 init_waitqueue_head(&ext4__ioend_wq[i]);
5340 }
5341
51865fda 5342 err = ext4_init_es();
6fd058f7
TT		 5343 if (err)
5344 return err;
51865fda
ZL		 5345
5346 err = ext4_init_pageio();
5347 if (err)
b5799018 5348 goto out5;
51865fda 5349
5dabfc78 5350 err = ext4_init_system_zone();
bd2d0210 5351 if (err)
b5799018 5352 goto out4;
857ac889 5353
b5799018 5354 err = ext4_init_sysfs();
dd68314c 5355 if (err)
b5799018 5356 goto out3;
857ac889 5357
5dabfc78 5358 err = ext4_init_mballoc();
c9de560d
AT		 5359 if (err)
5360 goto out2;
9c191f70
M		 5361 else
5362 ext4_mballoc_ready = 1;
ac27a0ec
DK		 5363 err = init_inodecache();
5364 if (err)
5365 goto out1;
24b58424 5366 register_as_ext3();
2035e776 5367 register_as_ext2();
03010a33 5368 err = register_filesystem(&ext4_fs_type);
ac27a0ec
DK		 5369 if (err)
5370 goto out;
bfff6873 5371
ac27a0ec
DK		 5372 return 0;
5373out:
24b58424
TT		 5374 unregister_as_ext2();
5375 unregister_as_ext3();
ac27a0ec
DK		 5376 destroy_inodecache();
5377out1:
9c191f70 5378 ext4_mballoc_ready = 0;
5dabfc78 5379 ext4_exit_mballoc();
9c191f70 5380out2:
b5799018
TT		 5381 ext4_exit_sysfs();
5382out3:
5dabfc78 5383 ext4_exit_system_zone();
b5799018 5384out4:
5dabfc78 5385 ext4_exit_pageio();
b5799018 5386out5:
51865fda
ZL		 5387 ext4_exit_es();
5388
ac27a0ec
DK		 5389 return err;
5390}
5391
5dabfc78 5392static void __exit ext4_exit_fs(void)
ac27a0ec 5393{
e298e73b 5394 ext4_exit_crypto();
bfff6873 5395 ext4_destroy_lazyinit_thread();
24b58424
TT		 5396 unregister_as_ext2();
5397 unregister_as_ext3();
03010a33 5398 unregister_filesystem(&ext4_fs_type);
ac27a0ec 5399 destroy_inodecache();
5dabfc78 5400 ext4_exit_mballoc();
b5799018 5401 ext4_exit_sysfs();
5dabfc78
TT		 5402 ext4_exit_system_zone();
5403 ext4_exit_pageio();
dd12ed14 5404 ext4_exit_es();
ac27a0ec
DK		 5405}
5406
5407MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
83982b6f 5408MODULE_DESCRIPTION("Fourth Extended Filesystem");
ac27a0ec 5409MODULE_LICENSE("GPL");
5dabfc78
TT		 5410module_init(ext4_init_fs)
5411module_exit(ext4_exit_fs)
A mirror of Linus' kernel repository