projects / deliverable / linux.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
ext4: move ext4_show_options() after parse_options()
[deliverable/linux.git] / fs / ext4 / super.c
CommitLineData
ac27a0ec 1/*
617ba13b 2 * linux/fs/ext4/super.c
ac27a0ec
DK		 3 *
4 * Copyright (C) 1992, 1993, 1994, 1995
5 * Remy Card (card@masi.ibp.fr)
6 * Laboratoire MASI - Institut Blaise Pascal
7 * Universite Pierre et Marie Curie (Paris VI)
8 *
9 * from
10 *
11 * linux/fs/minix/inode.c
12 *
13 * Copyright (C) 1991, 1992 Linus Torvalds
14 *
15 * Big-endian to little-endian byte-swapping/bitmaps by
16 * David S. Miller (davem@caip.rutgers.edu), 1995
17 */
18
19#include <linux/module.h>
20#include <linux/string.h>
21#include <linux/fs.h>
22#include <linux/time.h>
c5ca7c76 23#include <linux/vmalloc.h>
dab291af 24#include <linux/jbd2.h>
ac27a0ec
DK		 25#include <linux/slab.h>
26#include <linux/init.h>
27#include <linux/blkdev.h>
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>
9f6200bb 37#include <linux/proc_fs.h>
3197ebdb 38#include <linux/ctype.h>
1330593e 39#include <linux/log2.h>
717d50e4 40#include <linux/crc16.h>
7abc52c2 41#include <linux/cleancache.h>
ac27a0ec
DK		 42#include <asm/uaccess.h>
43
bfff6873
LC		 44#include <linux/kthread.h>
45#include <linux/freezer.h>
46
3dcf5451 47#include "ext4.h"
6f91bc5f 48#include "ext4_extents.h"
3dcf5451 49#include "ext4_jbd2.h"
ac27a0ec
DK		 50#include "xattr.h"
51#include "acl.h"
3661d286 52#include "mballoc.h"
ac27a0ec 53
9bffad1e
TT		 54#define CREATE_TRACE_POINTS
55#include <trace/events/ext4.h>
56
1f109d5a 57static struct proc_dir_entry *ext4_proc_root;
3197ebdb 58static struct kset *ext4_kset;
0b75a840
LC		 59static struct ext4_lazy_init *ext4_li_info;
60static struct mutex ext4_li_mtx;
61static struct ext4_features *ext4_feat;
9f6200bb 62
617ba13b 63static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
ac27a0ec 64 unsigned long journal_devnum);
2adf6da8 65static int ext4_show_options(struct seq_file *seq, struct dentry *root);
e2d67052 66static int ext4_commit_super(struct super_block *sb, int sync);
2b2d6d01
TT		 67static void ext4_mark_recovery_complete(struct super_block *sb,
68 struct ext4_super_block *es);
69static void ext4_clear_journal_err(struct super_block *sb,
70 struct ext4_super_block *es);
617ba13b 71static int ext4_sync_fs(struct super_block *sb, int wait);
2b2d6d01 72static const char *ext4_decode_error(struct super_block *sb, int errno,
ac27a0ec 73 char nbuf[16]);
2b2d6d01
TT		 74static int ext4_remount(struct super_block *sb, int *flags, char *data);
75static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
c4be0c1d 76static int ext4_unfreeze(struct super_block *sb);
2b2d6d01 77static void ext4_write_super(struct super_block *sb);
c4be0c1d 78static int ext4_freeze(struct super_block *sb);
152a0836
AV		 79static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
80 const char *dev_name, void *data);
2035e776
TT		 81static inline int ext2_feature_set_ok(struct super_block *sb);
82static inline int ext3_feature_set_ok(struct super_block *sb);
d39195c3 83static int ext4_feature_set_ok(struct super_block *sb, int readonly);
bfff6873
LC		 84static void ext4_destroy_lazyinit_thread(void);
85static void ext4_unregister_li_request(struct super_block *sb);
8f1f7453 86static void ext4_clear_request_list(void);
ac27a0ec 87
2035e776
TT		 88#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
89static struct file_system_type ext2_fs_type = {
90 .owner = THIS_MODULE,
91 .name = "ext2",
92 .mount = ext4_mount,
93 .kill_sb = kill_block_super,
94 .fs_flags = FS_REQUIRES_DEV,
95};
96#define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type)
97#else
98#define IS_EXT2_SB(sb) (0)
99#endif
100
101
ba69f9ab
JK		 102#if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
103static struct file_system_type ext3_fs_type = {
104 .owner = THIS_MODULE,
105 .name = "ext3",
152a0836 106 .mount = ext4_mount,
ba69f9ab
JK		 107 .kill_sb = kill_block_super,
108 .fs_flags = FS_REQUIRES_DEV,
109};
110#define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type)
111#else
112#define IS_EXT3_SB(sb) (0)
113#endif
bd81d8ee 114
9933fc0a
TT		 115void *ext4_kvmalloc(size_t size, gfp_t flags)
116{
117 void *ret;
118
119 ret = kmalloc(size, flags);
120 if (!ret)
121 ret = __vmalloc(size, flags, PAGE_KERNEL);
122 return ret;
123}
124
125void *ext4_kvzalloc(size_t size, gfp_t flags)
126{
127 void *ret;
128
db9481c0 129 ret = kzalloc(size, flags);
9933fc0a
TT		 130 if (!ret)
131 ret = __vmalloc(size, flags | __GFP_ZERO, PAGE_KERNEL);
132 return ret;
133}
134
135void ext4_kvfree(void *ptr)
136{
137 if (is_vmalloc_addr(ptr))
138 vfree(ptr);
139 else
140 kfree(ptr);
141
142}
143
8fadc143
AR		 144ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
145 struct ext4_group_desc *bg)
bd81d8ee 146{
3a14589c 147 return le32_to_cpu(bg->bg_block_bitmap_lo) |
8fadc143 148 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 149 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 150}
151
8fadc143
AR		 152ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
153 struct ext4_group_desc *bg)
bd81d8ee 154{
5272f837 155 return le32_to_cpu(bg->bg_inode_bitmap_lo) |
8fadc143 156 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 157 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 158}
159
8fadc143
AR		 160ext4_fsblk_t ext4_inode_table(struct super_block *sb,
161 struct ext4_group_desc *bg)
bd81d8ee 162{
5272f837 163 return le32_to_cpu(bg->bg_inode_table_lo) |
8fadc143 164 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 165 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
bd81d8ee
LV		 166}
167
021b65bb
TT		 168__u32 ext4_free_group_clusters(struct super_block *sb,
169 struct ext4_group_desc *bg)
560671a0
AK		 170{
171 return le16_to_cpu(bg->bg_free_blocks_count_lo) |
172 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 173 (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0);
560671a0
AK		 174}
175
176__u32 ext4_free_inodes_count(struct super_block *sb,
177 struct ext4_group_desc *bg)
178{
179 return le16_to_cpu(bg->bg_free_inodes_count_lo) |
180 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 181 (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0);
560671a0
AK		 182}
183
184__u32 ext4_used_dirs_count(struct super_block *sb,
185 struct ext4_group_desc *bg)
186{
187 return le16_to_cpu(bg->bg_used_dirs_count_lo) |
188 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 189 (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0);
560671a0
AK		 190}
191
192__u32 ext4_itable_unused_count(struct super_block *sb,
193 struct ext4_group_desc *bg)
194{
195 return le16_to_cpu(bg->bg_itable_unused_lo) |
196 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 197 (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0);
560671a0
AK		 198}
199
8fadc143
AR		 200void ext4_block_bitmap_set(struct super_block *sb,
201 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 202{
3a14589c 203 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 204 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
205 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 206}
207
8fadc143
AR		 208void ext4_inode_bitmap_set(struct super_block *sb,
209 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 210{
5272f837 211 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 212 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
213 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 214}
215
8fadc143
AR		 216void ext4_inode_table_set(struct super_block *sb,
217 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 218{
5272f837 219 bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 220 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
221 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 222}
223
021b65bb
TT		 224void ext4_free_group_clusters_set(struct super_block *sb,
225 struct ext4_group_desc *bg, __u32 count)
560671a0
AK		 226{
227 bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count);
228 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
229 bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16);
230}
231
232void ext4_free_inodes_set(struct super_block *sb,
233 struct ext4_group_desc *bg, __u32 count)
234{
235 bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count);
236 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
237 bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16);
238}
239
240void ext4_used_dirs_set(struct super_block *sb,
241 struct ext4_group_desc *bg, __u32 count)
242{
243 bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count);
244 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
245 bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16);
246}
247
248void ext4_itable_unused_set(struct super_block *sb,
249 struct ext4_group_desc *bg, __u32 count)
250{
251 bg->bg_itable_unused_lo = cpu_to_le16((__u16)count);
252 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
253 bg->bg_itable_unused_hi = cpu_to_le16(count >> 16);
254}
255
d3d1faf6
CW		 256
257/* Just increment the non-pointer handle value */
258static handle_t *ext4_get_nojournal(void)
259{
260 handle_t *handle = current->journal_info;
261 unsigned long ref_cnt = (unsigned long)handle;
262
263 BUG_ON(ref_cnt >= EXT4_NOJOURNAL_MAX_REF_COUNT);
264
265 ref_cnt++;
266 handle = (handle_t *)ref_cnt;
267
268 current->journal_info = handle;
269 return handle;
270}
271
272
273/* Decrement the non-pointer handle value */
274static void ext4_put_nojournal(handle_t *handle)
275{
276 unsigned long ref_cnt = (unsigned long)handle;
277
278 BUG_ON(ref_cnt == 0);
279
280 ref_cnt--;
281 handle = (handle_t *)ref_cnt;
282
283 current->journal_info = handle;
284}
285
ac27a0ec 286/*
dab291af 287 * Wrappers for jbd2_journal_start/end.
ac27a0ec
DK		 288 *
289 * The only special thing we need to do here is to make sure that all
290 * journal_end calls result in the superblock being marked dirty, so
291 * that sync() will call the filesystem's write_super callback if
292 * appropriate.
be4f27d3
YY		 293 *
294 * To avoid j_barrier hold in userspace when a user calls freeze(),
295 * ext4 prevents a new handle from being started by s_frozen, which
296 * is in an upper layer.
ac27a0ec 297 */
617ba13b 298handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks)
ac27a0ec
DK		 299{
300 journal_t *journal;
be4f27d3 301 handle_t *handle;
ac27a0ec 302
12706394 303 trace_ext4_journal_start(sb, nblocks, _RET_IP_);
ac27a0ec
DK		 304 if (sb->s_flags & MS_RDONLY)
305 return ERR_PTR(-EROFS);
306
617ba13b 307 journal = EXT4_SB(sb)->s_journal;
be4f27d3
YY		 308 handle = ext4_journal_current_handle();
309
310 /*
311 * If a handle has been started, it should be allowed to
312 * finish, otherwise deadlock could happen between freeze
313 * and others(e.g. truncate) due to the restart of the
314 * journal handle if the filesystem is forzen and active
315 * handles are not stopped.
316 */
317 if (!handle)
318 vfs_check_frozen(sb, SB_FREEZE_TRANS);
319
320 if (!journal)
321 return ext4_get_nojournal();
322 /*
323 * Special case here: if the journal has aborted behind our
324 * backs (eg. EIO in the commit thread), then we still need to
325 * take the FS itself readonly cleanly.
326 */
327 if (is_journal_aborted(journal)) {
328 ext4_abort(sb, "Detected aborted journal");
329 return ERR_PTR(-EROFS);
ac27a0ec 330 }
be4f27d3 331 return jbd2_journal_start(journal, nblocks);
ac27a0ec
DK		 332}
333
334/*
335 * The only special thing we need to do here is to make sure that all
dab291af 336 * jbd2_journal_stop calls result in the superblock being marked dirty, so
ac27a0ec
DK		 337 * that sync() will call the filesystem's write_super callback if
338 * appropriate.
339 */
c398eda0 340int __ext4_journal_stop(const char *where, unsigned int line, handle_t *handle)
ac27a0ec
DK		 341{
342 struct super_block *sb;
343 int err;
344 int rc;
345
0390131b 346 if (!ext4_handle_valid(handle)) {
d3d1faf6 347 ext4_put_nojournal(handle);
0390131b
FM		 348 return 0;
349 }
ac27a0ec
DK		 350 sb = handle->h_transaction->t_journal->j_private;
351 err = handle->h_err;
dab291af 352 rc = jbd2_journal_stop(handle);
ac27a0ec
DK		 353
354 if (!err)
355 err = rc;
356 if (err)
c398eda0 357 __ext4_std_error(sb, where, line, err);
ac27a0ec
DK		 358 return err;
359}
360
90c7201b
TT		 361void ext4_journal_abort_handle(const char *caller, unsigned int line,
362 const char *err_fn, struct buffer_head *bh,
363 handle_t *handle, int err)
ac27a0ec
DK		 364{
365 char nbuf[16];
617ba13b 366 const char *errstr = ext4_decode_error(NULL, err, nbuf);
ac27a0ec 367
0390131b
FM		 368 BUG_ON(!ext4_handle_valid(handle));
369
ac27a0ec
DK		 370 if (bh)
371 BUFFER_TRACE(bh, "abort");
372
373 if (!handle->h_err)
374 handle->h_err = err;
375
376 if (is_handle_aborted(handle))
377 return;
378
90c7201b
TT		 379 printk(KERN_ERR "%s:%d: aborting transaction: %s in %s\n",
380 caller, line, errstr, err_fn);
ac27a0ec 381
dab291af 382 jbd2_journal_abort_handle(handle);
ac27a0ec
DK		 383}
384
1c13d5c0
TT		 385static void __save_error_info(struct super_block *sb, const char *func,
386 unsigned int line)
387{
388 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
389
390 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
391 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
392 es->s_last_error_time = cpu_to_le32(get_seconds());
393 strncpy(es->s_last_error_func, func, sizeof(es->s_last_error_func));
394 es->s_last_error_line = cpu_to_le32(line);
395 if (!es->s_first_error_time) {
396 es->s_first_error_time = es->s_last_error_time;
397 strncpy(es->s_first_error_func, func,
398 sizeof(es->s_first_error_func));
399 es->s_first_error_line = cpu_to_le32(line);
400 es->s_first_error_ino = es->s_last_error_ino;
401 es->s_first_error_block = es->s_last_error_block;
402 }
66e61a9e
TT		 403 /*
404 * Start the daily error reporting function if it hasn't been
405 * started already
406 */
407 if (!es->s_error_count)
408 mod_timer(&EXT4_SB(sb)->s_err_report, jiffies + 24*60*60*HZ);
1c13d5c0
TT		 409 es->s_error_count = cpu_to_le32(le32_to_cpu(es->s_error_count) + 1);
410}
411
412static void save_error_info(struct super_block *sb, const char *func,
413 unsigned int line)
414{
415 __save_error_info(sb, func, line);
416 ext4_commit_super(sb, 1);
417}
418
7c2e7087
TT		 419/*
420 * The del_gendisk() function uninitializes the disk-specific data
421 * structures, including the bdi structure, without telling anyone
422 * else. Once this happens, any attempt to call mark_buffer_dirty()
423 * (for example, by ext4_commit_super), will cause a kernel OOPS.
424 * This is a kludge to prevent these oops until we can put in a proper
425 * hook in del_gendisk() to inform the VFS and file system layers.
426 */
427static int block_device_ejected(struct super_block *sb)
428{
429 struct inode *bd_inode = sb->s_bdev->bd_inode;
430 struct backing_dev_info *bdi = bd_inode->i_mapping->backing_dev_info;
431
432 return bdi->dev == NULL;
433}
434
18aadd47
BJ		 435static void ext4_journal_commit_callback(journal_t *journal, transaction_t *txn)
436{
437 struct super_block *sb = journal->j_private;
438 struct ext4_sb_info *sbi = EXT4_SB(sb);
439 int error = is_journal_aborted(journal);
440 struct ext4_journal_cb_entry *jce, *tmp;
441
442 spin_lock(&sbi->s_md_lock);
443 list_for_each_entry_safe(jce, tmp, &txn->t_private_list, jce_list) {
444 list_del_init(&jce->jce_list);
445 spin_unlock(&sbi->s_md_lock);
446 jce->jce_func(sb, jce, error);
447 spin_lock(&sbi->s_md_lock);
448 }
449 spin_unlock(&sbi->s_md_lock);
450}
1c13d5c0 451
ac27a0ec
DK		 452/* Deal with the reporting of failure conditions on a filesystem such as
453 * inconsistencies detected or read IO failures.
454 *
455 * On ext2, we can store the error state of the filesystem in the
617ba13b 456 * superblock. That is not possible on ext4, because we may have other
ac27a0ec
DK		 457 * write ordering constraints on the superblock which prevent us from
458 * writing it out straight away; and given that the journal is about to
459 * be aborted, we can't rely on the current, or future, transactions to
460 * write out the superblock safely.
461 *
dab291af 462 * We'll just use the jbd2_journal_abort() error code to record an error in
d6b198bc 463 * the journal instead. On recovery, the journal will complain about
ac27a0ec
DK		 464 * that error until we've noted it down and cleared it.
465 */
466
617ba13b 467static void ext4_handle_error(struct super_block *sb)
ac27a0ec 468{
ac27a0ec
DK		 469 if (sb->s_flags & MS_RDONLY)
470 return;
471
2b2d6d01 472 if (!test_opt(sb, ERRORS_CONT)) {
617ba13b 473 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 474
4ab2f15b 475 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
ac27a0ec 476 if (journal)
dab291af 477 jbd2_journal_abort(journal, -EIO);
ac27a0ec 478 }
2b2d6d01 479 if (test_opt(sb, ERRORS_RO)) {
b31e1552 480 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
ac27a0ec
DK		 481 sb->s_flags |= MS_RDONLY;
482 }
ac27a0ec 483 if (test_opt(sb, ERRORS_PANIC))
617ba13b 484 panic("EXT4-fs (device %s): panic forced after error\n",
ac27a0ec
DK		 485 sb->s_id);
486}
487
12062ddd 488void __ext4_error(struct super_block *sb, const char *function,
c398eda0 489 unsigned int line, const char *fmt, ...)
ac27a0ec 490{
0ff2ea7d 491 struct va_format vaf;
ac27a0ec
DK		 492 va_list args;
493
494 va_start(args, fmt);
0ff2ea7d
JP		 495 vaf.fmt = fmt;
496 vaf.va = &args;
497 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n",
498 sb->s_id, function, line, current->comm, &vaf);
ac27a0ec
DK		 499 va_end(args);
500
617ba13b 501 ext4_handle_error(sb);
ac27a0ec
DK		 502}
503
c398eda0
TT		 504void ext4_error_inode(struct inode *inode, const char *function,
505 unsigned int line, ext4_fsblk_t block,
273df556
FM		 506 const char *fmt, ...)
507{
508 va_list args;
f7c21177 509 struct va_format vaf;
1c13d5c0 510 struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
273df556 511
1c13d5c0
TT		 512 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
513 es->s_last_error_block = cpu_to_le64(block);
514 save_error_info(inode->i_sb, function, line);
273df556 515 va_start(args, fmt);
f7c21177
TT		 516 vaf.fmt = fmt;
517 vaf.va = &args;
c398eda0
TT		 518 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: inode #%lu: ",
519 inode->i_sb->s_id, function, line, inode->i_ino);
520 if (block)
f7c21177
TT		 521 printk(KERN_CONT "block %llu: ", block);
522 printk(KERN_CONT "comm %s: %pV\n", current->comm, &vaf);
273df556
FM		 523 va_end(args);
524
525 ext4_handle_error(inode->i_sb);
526}
527
c398eda0 528void ext4_error_file(struct file *file, const char *function,
f7c21177
TT		 529 unsigned int line, ext4_fsblk_t block,
530 const char *fmt, ...)
273df556
FM		 531{
532 va_list args;
f7c21177 533 struct va_format vaf;
1c13d5c0 534 struct ext4_super_block *es;
273df556
FM		 535 struct inode *inode = file->f_dentry->d_inode;
536 char pathname[80], *path;
537
1c13d5c0
TT		 538 es = EXT4_SB(inode->i_sb)->s_es;
539 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
540 save_error_info(inode->i_sb, function, line);
273df556 541 path = d_path(&(file->f_path), pathname, sizeof(pathname));
f9a62d09 542 if (IS_ERR(path))
273df556
FM		 543 path = "(unknown)";
544 printk(KERN_CRIT
f7c21177
TT		 545 "EXT4-fs error (device %s): %s:%d: inode #%lu: ",
546 inode->i_sb->s_id, function, line, inode->i_ino);
547 if (block)
548 printk(KERN_CONT "block %llu: ", block);
549 va_start(args, fmt);
550 vaf.fmt = fmt;
551 vaf.va = &args;
552 printk(KERN_CONT "comm %s: path %s: %pV\n", current->comm, path, &vaf);
273df556
FM		 553 va_end(args);
554
555 ext4_handle_error(inode->i_sb);
556}
557
2b2d6d01 558static const char *ext4_decode_error(struct super_block *sb, int errno,
ac27a0ec
DK		 559 char nbuf[16])
560{
561 char *errstr = NULL;
562
563 switch (errno) {
564 case -EIO:
565 errstr = "IO failure";
566 break;
567 case -ENOMEM:
568 errstr = "Out of memory";
569 break;
570 case -EROFS:
78f1ddbb
TT		 571 if (!sb || (EXT4_SB(sb)->s_journal &&
572 EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT))
ac27a0ec
DK		 573 errstr = "Journal has aborted";
574 else
575 errstr = "Readonly filesystem";
576 break;
577 default:
578 /* If the caller passed in an extra buffer for unknown
579 * errors, textualise them now. Else we just return
580 * NULL. */
581 if (nbuf) {
582 /* Check for truncated error codes... */
583 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
584 errstr = nbuf;
585 }
586 break;
587 }
588
589 return errstr;
590}
591
617ba13b 592/* __ext4_std_error decodes expected errors from journaling functions
ac27a0ec
DK		 593 * automatically and invokes the appropriate error response. */
594
c398eda0
TT		 595void __ext4_std_error(struct super_block *sb, const char *function,
596 unsigned int line, int errno)
ac27a0ec
DK		 597{
598 char nbuf[16];
599 const char *errstr;
600
601 /* Special case: if the error is EROFS, and we're not already
602 * inside a transaction, then there's really no point in logging
603 * an error. */
604 if (errno == -EROFS && journal_current_handle() == NULL &&
605 (sb->s_flags & MS_RDONLY))
606 return;
607
617ba13b 608 errstr = ext4_decode_error(sb, errno, nbuf);
c398eda0
TT		 609 printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n",
610 sb->s_id, function, line, errstr);
1c13d5c0 611 save_error_info(sb, function, line);
ac27a0ec 612
617ba13b 613 ext4_handle_error(sb);
ac27a0ec
DK		 614}
615
616/*
617ba13b 617 * ext4_abort is a much stronger failure handler than ext4_error. The
ac27a0ec
DK		 618 * abort function may be used to deal with unrecoverable failures such
619 * as journal IO errors or ENOMEM at a critical moment in log management.
620 *
621 * We unconditionally force the filesystem into an ABORT|READONLY state,
622 * unless the error response on the fs has been set to panic in which
623 * case we take the easy way out and panic immediately.
624 */
625
c67d859e 626void __ext4_abort(struct super_block *sb, const char *function,
c398eda0 627 unsigned int line, const char *fmt, ...)
ac27a0ec
DK		 628{
629 va_list args;
630
1c13d5c0 631 save_error_info(sb, function, line);
ac27a0ec 632 va_start(args, fmt);
c398eda0
TT		 633 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: ", sb->s_id,
634 function, line);
ac27a0ec
DK		 635 vprintk(fmt, args);
636 printk("\n");
637 va_end(args);
638
1c13d5c0
TT		 639 if ((sb->s_flags & MS_RDONLY) == 0) {
640 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
641 sb->s_flags |= MS_RDONLY;
642 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
643 if (EXT4_SB(sb)->s_journal)
644 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
645 save_error_info(sb, function, line);
646 }
ac27a0ec 647 if (test_opt(sb, ERRORS_PANIC))
617ba13b 648 panic("EXT4-fs panic from previous error\n");
ac27a0ec
DK		 649}
650
0ff2ea7d 651void ext4_msg(struct super_block *sb, const char *prefix, const char *fmt, ...)
b31e1552 652{
0ff2ea7d 653 struct va_format vaf;
b31e1552
ES		 654 va_list args;
655
656 va_start(args, fmt);
0ff2ea7d
JP		 657 vaf.fmt = fmt;
658 vaf.va = &args;
659 printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
b31e1552
ES		 660 va_end(args);
661}
662
12062ddd 663void __ext4_warning(struct super_block *sb, const char *function,
c398eda0 664 unsigned int line, const char *fmt, ...)
ac27a0ec 665{
0ff2ea7d 666 struct va_format vaf;
ac27a0ec
DK		 667 va_list args;
668
669 va_start(args, fmt);
0ff2ea7d
JP		 670 vaf.fmt = fmt;
671 vaf.va = &args;
672 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: %pV\n",
673 sb->s_id, function, line, &vaf);
ac27a0ec
DK		 674 va_end(args);
675}
676
e29136f8
TT		 677void __ext4_grp_locked_error(const char *function, unsigned int line,
678 struct super_block *sb, ext4_group_t grp,
679 unsigned long ino, ext4_fsblk_t block,
680 const char *fmt, ...)
5d1b1b3f
AK		 681__releases(bitlock)
682__acquires(bitlock)
683{
0ff2ea7d 684 struct va_format vaf;
5d1b1b3f
AK		 685 va_list args;
686 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
687
1c13d5c0
TT		 688 es->s_last_error_ino = cpu_to_le32(ino);
689 es->s_last_error_block = cpu_to_le64(block);
690 __save_error_info(sb, function, line);
0ff2ea7d 691
5d1b1b3f 692 va_start(args, fmt);
0ff2ea7d
JP		 693
694 vaf.fmt = fmt;
695 vaf.va = &args;
21149d61 696 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u, ",
e29136f8
TT		 697 sb->s_id, function, line, grp);
698 if (ino)
0ff2ea7d 699 printk(KERN_CONT "inode %lu: ", ino);
e29136f8 700 if (block)
0ff2ea7d
JP		 701 printk(KERN_CONT "block %llu:", (unsigned long long) block);
702 printk(KERN_CONT "%pV\n", &vaf);
5d1b1b3f
AK		 703 va_end(args);
704
705 if (test_opt(sb, ERRORS_CONT)) {
e2d67052 706 ext4_commit_super(sb, 0);
5d1b1b3f
AK		 707 return;
708 }
1c13d5c0 709
5d1b1b3f
AK		 710 ext4_unlock_group(sb, grp);
711 ext4_handle_error(sb);
712 /*
713 * We only get here in the ERRORS_RO case; relocking the group
714 * may be dangerous, but nothing bad will happen since the
715 * filesystem will have already been marked read/only and the
716 * journal has been aborted. We return 1 as a hint to callers
717 * who might what to use the return value from
25985edc 718 * ext4_grp_locked_error() to distinguish between the
5d1b1b3f
AK		 719 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
720 * aggressively from the ext4 function in question, with a
721 * more appropriate error code.
722 */
723 ext4_lock_group(sb, grp);
724 return;
725}
726
617ba13b 727void ext4_update_dynamic_rev(struct super_block *sb)
ac27a0ec 728{
617ba13b 729 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
ac27a0ec 730
617ba13b 731 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
ac27a0ec
DK		 732 return;
733
12062ddd 734 ext4_warning(sb,
ac27a0ec
DK		 735 "updating to rev %d because of new feature flag, "
736 "running e2fsck is recommended",
617ba13b 737 EXT4_DYNAMIC_REV);
ac27a0ec 738
617ba13b
MC		 739 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
740 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
741 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
ac27a0ec
DK		 742 /* leave es->s_feature_*compat flags alone */
743 /* es->s_uuid will be set by e2fsck if empty */
744
745 /*
746 * The rest of the superblock fields should be zero, and if not it
747 * means they are likely already in use, so leave them alone. We
748 * can leave it up to e2fsck to clean up any inconsistencies there.
749 */
750}
751
752/*
753 * Open the external journal device
754 */
b31e1552 755static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb)
ac27a0ec
DK		 756{
757 struct block_device *bdev;
758 char b[BDEVNAME_SIZE];
759
d4d77629 760 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
ac27a0ec
DK		 761 if (IS_ERR(bdev))
762 goto fail;
763 return bdev;
764
765fail:
b31e1552 766 ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld",
ac27a0ec
DK		 767 __bdevname(dev, b), PTR_ERR(bdev));
768 return NULL;
769}
770
771/*
772 * Release the journal device
773 */
617ba13b 774static int ext4_blkdev_put(struct block_device *bdev)
ac27a0ec 775{
e525fd89 776 return blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
ac27a0ec
DK		 777}
778
617ba13b 779static int ext4_blkdev_remove(struct ext4_sb_info *sbi)
ac27a0ec
DK		 780{
781 struct block_device *bdev;
782 int ret = -ENODEV;
783
784 bdev = sbi->journal_bdev;
785 if (bdev) {
617ba13b 786 ret = ext4_blkdev_put(bdev);
ac27a0ec
DK		 787 sbi->journal_bdev = NULL;
788 }
789 return ret;
790}
791
792static inline struct inode *orphan_list_entry(struct list_head *l)
793{
617ba13b 794 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
ac27a0ec
DK		 795}
796
617ba13b 797static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
ac27a0ec
DK		 798{
799 struct list_head *l;
800
b31e1552
ES		 801 ext4_msg(sb, KERN_ERR, "sb orphan head is %d",
802 le32_to_cpu(sbi->s_es->s_last_orphan));
ac27a0ec
DK		 803
804 printk(KERN_ERR "sb_info orphan list:\n");
805 list_for_each(l, &sbi->s_orphan) {
806 struct inode *inode = orphan_list_entry(l);
807 printk(KERN_ERR " "
808 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
809 inode->i_sb->s_id, inode->i_ino, inode,
810 inode->i_mode, inode->i_nlink,
811 NEXT_ORPHAN(inode));
812 }
813}
814
2b2d6d01 815static void ext4_put_super(struct super_block *sb)
ac27a0ec 816{
617ba13b
MC		 817 struct ext4_sb_info *sbi = EXT4_SB(sb);
818 struct ext4_super_block *es = sbi->s_es;
ef2cabf7 819 int i, err;
ac27a0ec 820
857ac889 821 ext4_unregister_li_request(sb);
e0ccfd95
CH		 822 dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
823
4c0425ff
MC		 824 flush_workqueue(sbi->dio_unwritten_wq);
825 destroy_workqueue(sbi->dio_unwritten_wq);
826
a9e220f8 827 lock_super(sb);
8c85e125 828 if (sb->s_dirt)
ebc1ac16 829 ext4_commit_super(sb, 1);
8c85e125 830
0390131b
FM		 831 if (sbi->s_journal) {
832 err = jbd2_journal_destroy(sbi->s_journal);
833 sbi->s_journal = NULL;
834 if (err < 0)
c67d859e 835 ext4_abort(sb, "Couldn't clean up the journal");
0390131b 836 }
d4edac31 837
a1c6c569 838 del_timer(&sbi->s_err_report);
d4edac31
JB		 839 ext4_release_system_zone(sb);
840 ext4_mb_release(sb);
841 ext4_ext_release(sb);
842 ext4_xattr_put_super(sb);
843
ac27a0ec 844 if (!(sb->s_flags & MS_RDONLY)) {
617ba13b 845 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
ac27a0ec 846 es->s_state = cpu_to_le16(sbi->s_mount_state);
e2d67052 847 ext4_commit_super(sb, 1);
ac27a0ec 848 }
240799cd 849 if (sbi->s_proc) {
9f6200bb 850 remove_proc_entry(sb->s_id, ext4_proc_root);
240799cd 851 }
3197ebdb 852 kobject_del(&sbi->s_kobj);
ac27a0ec
DK		 853
854 for (i = 0; i < sbi->s_gdb_count; i++)
855 brelse(sbi->s_group_desc[i]);
f18a5f21 856 ext4_kvfree(sbi->s_group_desc);
9933fc0a 857 ext4_kvfree(sbi->s_flex_groups);
57042651 858 percpu_counter_destroy(&sbi->s_freeclusters_counter);
ac27a0ec
DK		 859 percpu_counter_destroy(&sbi->s_freeinodes_counter);
860 percpu_counter_destroy(&sbi->s_dirs_counter);
57042651 861 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
ac27a0ec
DK		 862 brelse(sbi->s_sbh);
863#ifdef CONFIG_QUOTA
864 for (i = 0; i < MAXQUOTAS; i++)
865 kfree(sbi->s_qf_names[i]);
866#endif
867
868 /* Debugging code just in case the in-memory inode orphan list
869 * isn't empty. The on-disk one can be non-empty if we've
870 * detected an error and taken the fs readonly, but the
871 * in-memory list had better be clean by this point. */
872 if (!list_empty(&sbi->s_orphan))
873 dump_orphan_list(sb, sbi);
874 J_ASSERT(list_empty(&sbi->s_orphan));
875
f98393a6 876 invalidate_bdev(sb->s_bdev);
ac27a0ec
DK		 877 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
878 /*
879 * Invalidate the journal device's buffers. We don't want them
880 * floating about in memory - the physical journal device may
881 * hotswapped, and it breaks the `ro-after' testing code.
882 */
883 sync_blockdev(sbi->journal_bdev);
f98393a6 884 invalidate_bdev(sbi->journal_bdev);
617ba13b 885 ext4_blkdev_remove(sbi);
ac27a0ec 886 }
c5e06d10
JL		 887 if (sbi->s_mmp_tsk)
888 kthread_stop(sbi->s_mmp_tsk);
ac27a0ec 889 sb->s_fs_info = NULL;
3197ebdb
TT		 890 /*
891 * Now that we are completely done shutting down the
892 * superblock, we need to actually destroy the kobject.
893 */
3197ebdb
TT		 894 unlock_super(sb);
895 kobject_put(&sbi->s_kobj);
896 wait_for_completion(&sbi->s_kobj_unregister);
705895b6 897 kfree(sbi->s_blockgroup_lock);
ac27a0ec 898 kfree(sbi);
ac27a0ec
DK		 899}
900
e18b890b 901static struct kmem_cache *ext4_inode_cachep;
ac27a0ec
DK		 902
903/*
904 * Called inside transaction, so use GFP_NOFS
905 */
617ba13b 906static struct inode *ext4_alloc_inode(struct super_block *sb)
ac27a0ec 907{
617ba13b 908 struct ext4_inode_info *ei;
ac27a0ec 909
e6b4f8da 910 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
ac27a0ec
DK		 911 if (!ei)
912 return NULL;
0b8e58a1 913
ac27a0ec 914 ei->vfs_inode.i_version = 1;
91246c00 915 ei->vfs_inode.i_data.writeback_index = 0;
a86c6181 916 memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache));
c9de560d
AT		 917 INIT_LIST_HEAD(&ei->i_prealloc_list);
918 spin_lock_init(&ei->i_prealloc_lock);
d2a17637
MC		 919 ei->i_reserved_data_blocks = 0;
920 ei->i_reserved_meta_blocks = 0;
921 ei->i_allocated_meta_blocks = 0;
9d0be502 922 ei->i_da_metadata_calc_len = 0;
d2a17637 923 spin_lock_init(&(ei->i_block_reservation_lock));
a9e7f447
DM		 924#ifdef CONFIG_QUOTA
925 ei->i_reserved_quota = 0;
926#endif
8aefcd55 927 ei->jinode = NULL;
c7064ef1 928 INIT_LIST_HEAD(&ei->i_completed_io_list);
744692dc 929 spin_lock_init(&ei->i_completed_io_lock);
8d5d02e6 930 ei->cur_aio_dio = NULL;
b436b9be
JK		 931 ei->i_sync_tid = 0;
932 ei->i_datasync_tid = 0;
f7ad6d2e 933 atomic_set(&ei->i_ioend_count, 0);
e9e3bcec 934 atomic_set(&ei->i_aiodio_unwritten, 0);
0b8e58a1 935
ac27a0ec
DK		 936 return &ei->vfs_inode;
937}
938
7ff9c073
TT		 939static int ext4_drop_inode(struct inode *inode)
940{
941 int drop = generic_drop_inode(inode);
942
943 trace_ext4_drop_inode(inode, drop);
944 return drop;
945}
946
fa0d7e3d
NP		 947static void ext4_i_callback(struct rcu_head *head)
948{
949 struct inode *inode = container_of(head, struct inode, i_rcu);
fa0d7e3d
NP		 950 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
951}
952
617ba13b 953static void ext4_destroy_inode(struct inode *inode)
ac27a0ec 954{
9f7dd93d 955 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
b31e1552
ES		 956 ext4_msg(inode->i_sb, KERN_ERR,
957 "Inode %lu (%p): orphan list check failed!",
958 inode->i_ino, EXT4_I(inode));
9f7dd93d
VA		 959 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
960 EXT4_I(inode), sizeof(struct ext4_inode_info),
961 true);
962 dump_stack();
963 }
fa0d7e3d 964 call_rcu(&inode->i_rcu, ext4_i_callback);
ac27a0ec
DK		 965}
966
51cc5068 967static void init_once(void *foo)
ac27a0ec 968{
617ba13b 969 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
ac27a0ec 970
a35afb83 971 INIT_LIST_HEAD(&ei->i_orphan);
03010a33 972#ifdef CONFIG_EXT4_FS_XATTR
a35afb83 973 init_rwsem(&ei->xattr_sem);
ac27a0ec 974#endif
0e855ac8 975 init_rwsem(&ei->i_data_sem);
a35afb83 976 inode_init_once(&ei->vfs_inode);
ac27a0ec
DK		 977}
978
979static int init_inodecache(void)
980{
617ba13b
MC		 981 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
982 sizeof(struct ext4_inode_info),
ac27a0ec
DK		 983 0, (SLAB_RECLAIM_ACCOUNT|
984 SLAB_MEM_SPREAD),
20c2df83 985 init_once);
617ba13b 986 if (ext4_inode_cachep == NULL)
ac27a0ec
DK		 987 return -ENOMEM;
988 return 0;
989}
990
991static void destroy_inodecache(void)
992{
617ba13b 993 kmem_cache_destroy(ext4_inode_cachep);
ac27a0ec
DK		 994}
995
0930fcc1 996void ext4_clear_inode(struct inode *inode)
ac27a0ec 997{
0930fcc1
AV		 998 invalidate_inode_buffers(inode);
999 end_writeback(inode);
9f754758 1000 dquot_drop(inode);
c2ea3fde 1001 ext4_discard_preallocations(inode);
8aefcd55
TT		 1002 if (EXT4_I(inode)->jinode) {
1003 jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode),
1004 EXT4_I(inode)->jinode);
1005 jbd2_free_inode(EXT4_I(inode)->jinode);
1006 EXT4_I(inode)->jinode = NULL;
1007 }
ac27a0ec
DK		 1008}
1009
1b961ac0 1010static struct inode *ext4_nfs_get_inode(struct super_block *sb,
0b8e58a1 1011 u64 ino, u32 generation)
ac27a0ec 1012{
ac27a0ec 1013 struct inode *inode;
ac27a0ec 1014
617ba13b 1015 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
ac27a0ec 1016 return ERR_PTR(-ESTALE);
617ba13b 1017 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
ac27a0ec
DK		 1018 return ERR_PTR(-ESTALE);
1019
1020 /* iget isn't really right if the inode is currently unallocated!!
1021 *
617ba13b 1022 * ext4_read_inode will return a bad_inode if the inode had been
ac27a0ec
DK		 1023 * deleted, so we should be safe.
1024 *
1025 * Currently we don't know the generation for parent directory, so
1026 * a generation of 0 means "accept any"
1027 */
1d1fe1ee
DH		 1028 inode = ext4_iget(sb, ino);
1029 if (IS_ERR(inode))
1030 return ERR_CAST(inode);
1031 if (generation && inode->i_generation != generation) {
ac27a0ec
DK		 1032 iput(inode);
1033 return ERR_PTR(-ESTALE);
1034 }
1b961ac0
CH		 1035
1036 return inode;
1037}
1038
1039static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
0b8e58a1 1040 int fh_len, int fh_type)
1b961ac0
CH		 1041{
1042 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
1043 ext4_nfs_get_inode);
1044}
1045
1046static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
0b8e58a1 1047 int fh_len, int fh_type)
1b961ac0
CH		 1048{
1049 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
1050 ext4_nfs_get_inode);
ac27a0ec
DK		 1051}
1052
c39a7f84
TO		 1053/*
1054 * Try to release metadata pages (indirect blocks, directories) which are
1055 * mapped via the block device. Since these pages could have journal heads
1056 * which would prevent try_to_free_buffers() from freeing them, we must use
1057 * jbd2 layer's try_to_free_buffers() function to release them.
1058 */
0b8e58a1
AD		 1059static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
1060 gfp_t wait)
c39a7f84
TO		 1061{
1062 journal_t *journal = EXT4_SB(sb)->s_journal;
1063
1064 WARN_ON(PageChecked(page));
1065 if (!page_has_buffers(page))
1066 return 0;
1067 if (journal)
1068 return jbd2_journal_try_to_free_buffers(journal, page,
1069 wait & ~__GFP_WAIT);
1070 return try_to_free_buffers(page);
1071}
1072
ac27a0ec 1073#ifdef CONFIG_QUOTA
af5bc92d 1074#define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
2b2d6d01 1075#define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
ac27a0ec 1076
617ba13b
MC		 1077static int ext4_write_dquot(struct dquot *dquot);
1078static int ext4_acquire_dquot(struct dquot *dquot);
1079static int ext4_release_dquot(struct dquot *dquot);
1080static int ext4_mark_dquot_dirty(struct dquot *dquot);
1081static int ext4_write_info(struct super_block *sb, int type);
6f28e087 1082static int ext4_quota_on(struct super_block *sb, int type, int format_id,
f00c9e44 1083 struct path *path);
ca0e05e4 1084static int ext4_quota_off(struct super_block *sb, int type);
617ba13b
MC		 1085static int ext4_quota_on_mount(struct super_block *sb, int type);
1086static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec 1087 size_t len, loff_t off);
617ba13b 1088static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec
DK		 1089 const char *data, size_t len, loff_t off);
1090
61e225dc 1091static const struct dquot_operations ext4_quota_operations = {
60e58e0f 1092 .get_reserved_space = ext4_get_reserved_space,
617ba13b
MC		 1093 .write_dquot = ext4_write_dquot,
1094 .acquire_dquot = ext4_acquire_dquot,
1095 .release_dquot = ext4_release_dquot,
1096 .mark_dirty = ext4_mark_dquot_dirty,
a5b5ee32
JK		 1097 .write_info = ext4_write_info,
1098 .alloc_dquot = dquot_alloc,
1099 .destroy_dquot = dquot_destroy,
ac27a0ec
DK		 1100};
1101
0d54b217 1102static const struct quotactl_ops ext4_qctl_operations = {
617ba13b 1103 .quota_on = ext4_quota_on,
ca0e05e4 1104 .quota_off = ext4_quota_off,
287a8095
CH		 1105 .quota_sync = dquot_quota_sync,
1106 .get_info = dquot_get_dqinfo,
1107 .set_info = dquot_set_dqinfo,
1108 .get_dqblk = dquot_get_dqblk,
1109 .set_dqblk = dquot_set_dqblk
ac27a0ec
DK		 1110};
1111#endif
1112
ee9b6d61 1113static const struct super_operations ext4_sops = {
617ba13b
MC		 1114 .alloc_inode = ext4_alloc_inode,
1115 .destroy_inode = ext4_destroy_inode,
617ba13b
MC		 1116 .write_inode = ext4_write_inode,
1117 .dirty_inode = ext4_dirty_inode,
7ff9c073 1118 .drop_inode = ext4_drop_inode,
0930fcc1 1119 .evict_inode = ext4_evict_inode,
617ba13b 1120 .put_super = ext4_put_super,
617ba13b 1121 .sync_fs = ext4_sync_fs,
c4be0c1d
TS		 1122 .freeze_fs = ext4_freeze,
1123 .unfreeze_fs = ext4_unfreeze,
617ba13b
MC		 1124 .statfs = ext4_statfs,
1125 .remount_fs = ext4_remount,
617ba13b 1126 .show_options = ext4_show_options,
ac27a0ec 1127#ifdef CONFIG_QUOTA
617ba13b
MC		 1128 .quota_read = ext4_quota_read,
1129 .quota_write = ext4_quota_write,
ac27a0ec 1130#endif
c39a7f84 1131 .bdev_try_to_free_page = bdev_try_to_free_page,
ac27a0ec
DK		 1132};
1133
9ca92389
TT		 1134static const struct super_operations ext4_nojournal_sops = {
1135 .alloc_inode = ext4_alloc_inode,
1136 .destroy_inode = ext4_destroy_inode,
1137 .write_inode = ext4_write_inode,
1138 .dirty_inode = ext4_dirty_inode,
7ff9c073 1139 .drop_inode = ext4_drop_inode,
0930fcc1 1140 .evict_inode = ext4_evict_inode,
9ca92389
TT		 1141 .write_super = ext4_write_super,
1142 .put_super = ext4_put_super,
1143 .statfs = ext4_statfs,
1144 .remount_fs = ext4_remount,
9ca92389
TT		 1145 .show_options = ext4_show_options,
1146#ifdef CONFIG_QUOTA
1147 .quota_read = ext4_quota_read,
1148 .quota_write = ext4_quota_write,
1149#endif
1150 .bdev_try_to_free_page = bdev_try_to_free_page,
1151};
1152
39655164 1153static const struct export_operations ext4_export_ops = {
1b961ac0
CH		 1154 .fh_to_dentry = ext4_fh_to_dentry,
1155 .fh_to_parent = ext4_fh_to_parent,
617ba13b 1156 .get_parent = ext4_get_parent,
ac27a0ec
DK		 1157};
1158
1159enum {
1160 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
1161 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
72578c33 1162 Opt_nouid32, Opt_debug, Opt_removed,
ac27a0ec 1163 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
72578c33 1164 Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload,
30773840 1165 Opt_commit, Opt_min_batch_time, Opt_max_batch_time,
43e625d8 1166 Opt_journal_dev, Opt_journal_checksum, Opt_journal_async_commit,
ac27a0ec 1167 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
296c355c 1168 Opt_data_err_abort, Opt_data_err_ignore,
ac27a0ec 1169 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
5a20bdfc 1170 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
ee4a3fcd 1171 Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err,
661aa520 1172 Opt_usrquota, Opt_grpquota, Opt_i_version,
1449032b
TT		 1173 Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_mblk_io_submit,
1174 Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity,
5328e635 1175 Opt_inode_readahead_blks, Opt_journal_ioprio,
744692dc 1176 Opt_dioread_nolock, Opt_dioread_lock,
fc6cb1cd 1177 Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable,
ac27a0ec
DK		 1178};
1179
a447c093 1180static const match_table_t tokens = {
ac27a0ec
DK		 1181 {Opt_bsd_df, "bsddf"},
1182 {Opt_minix_df, "minixdf"},
1183 {Opt_grpid, "grpid"},
1184 {Opt_grpid, "bsdgroups"},
1185 {Opt_nogrpid, "nogrpid"},
1186 {Opt_nogrpid, "sysvgroups"},
1187 {Opt_resgid, "resgid=%u"},
1188 {Opt_resuid, "resuid=%u"},
1189 {Opt_sb, "sb=%u"},
1190 {Opt_err_cont, "errors=continue"},
1191 {Opt_err_panic, "errors=panic"},
1192 {Opt_err_ro, "errors=remount-ro"},
1193 {Opt_nouid32, "nouid32"},
ac27a0ec 1194 {Opt_debug, "debug"},
72578c33
TT		 1195 {Opt_removed, "oldalloc"},
1196 {Opt_removed, "orlov"},
ac27a0ec
DK		 1197 {Opt_user_xattr, "user_xattr"},
1198 {Opt_nouser_xattr, "nouser_xattr"},
1199 {Opt_acl, "acl"},
1200 {Opt_noacl, "noacl"},
ac27a0ec 1201 {Opt_noload, "noload"},
e3bb52ae 1202 {Opt_noload, "norecovery"},
72578c33
TT		 1203 {Opt_removed, "nobh"},
1204 {Opt_removed, "bh"},
ac27a0ec 1205 {Opt_commit, "commit=%u"},
30773840
TT		 1206 {Opt_min_batch_time, "min_batch_time=%u"},
1207 {Opt_max_batch_time, "max_batch_time=%u"},
ac27a0ec 1208 {Opt_journal_dev, "journal_dev=%u"},
818d276c
GS		 1209 {Opt_journal_checksum, "journal_checksum"},
1210 {Opt_journal_async_commit, "journal_async_commit"},
ac27a0ec
DK		 1211 {Opt_abort, "abort"},
1212 {Opt_data_journal, "data=journal"},
1213 {Opt_data_ordered, "data=ordered"},
1214 {Opt_data_writeback, "data=writeback"},
5bf5683a
HK		 1215 {Opt_data_err_abort, "data_err=abort"},
1216 {Opt_data_err_ignore, "data_err=ignore"},
ac27a0ec
DK		 1217 {Opt_offusrjquota, "usrjquota="},
1218 {Opt_usrjquota, "usrjquota=%s"},
1219 {Opt_offgrpjquota, "grpjquota="},
1220 {Opt_grpjquota, "grpjquota=%s"},
1221 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
1222 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
5a20bdfc 1223 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
ac27a0ec
DK		 1224 {Opt_grpquota, "grpquota"},
1225 {Opt_noquota, "noquota"},
1226 {Opt_quota, "quota"},
1227 {Opt_usrquota, "usrquota"},
1228 {Opt_barrier, "barrier=%u"},
06705bff
TT		 1229 {Opt_barrier, "barrier"},
1230 {Opt_nobarrier, "nobarrier"},
25ec56b5 1231 {Opt_i_version, "i_version"},
c9de560d 1232 {Opt_stripe, "stripe=%u"},
64769240 1233 {Opt_delalloc, "delalloc"},
dd919b98 1234 {Opt_nodelalloc, "nodelalloc"},
1449032b
TT		 1235 {Opt_mblk_io_submit, "mblk_io_submit"},
1236 {Opt_nomblk_io_submit, "nomblk_io_submit"},
6fd058f7
TT		 1237 {Opt_block_validity, "block_validity"},
1238 {Opt_noblock_validity, "noblock_validity"},
240799cd 1239 {Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
b3881f74 1240 {Opt_journal_ioprio, "journal_ioprio=%u"},
afd4672d 1241 {Opt_auto_da_alloc, "auto_da_alloc=%u"},
06705bff
TT		 1242 {Opt_auto_da_alloc, "auto_da_alloc"},
1243 {Opt_noauto_da_alloc, "noauto_da_alloc"},
744692dc
JZ		 1244 {Opt_dioread_nolock, "dioread_nolock"},
1245 {Opt_dioread_lock, "dioread_lock"},
5328e635
ES		 1246 {Opt_discard, "discard"},
1247 {Opt_nodiscard, "nodiscard"},
fc6cb1cd
TT		 1248 {Opt_init_itable, "init_itable=%u"},
1249 {Opt_init_itable, "init_itable"},
1250 {Opt_noinit_itable, "noinit_itable"},
f3f12faa 1251 {Opt_err, NULL},
ac27a0ec
DK		 1252};
1253
617ba13b 1254static ext4_fsblk_t get_sb_block(void **data)
ac27a0ec 1255{
617ba13b 1256 ext4_fsblk_t sb_block;
ac27a0ec
DK		 1257 char *options = (char *) *data;
1258
1259 if (!options || strncmp(options, "sb=", 3) != 0)
1260 return 1; /* Default location */
0b8e58a1 1261
ac27a0ec 1262 options += 3;
0b8e58a1 1263 /* TODO: use simple_strtoll with >32bit ext4 */
ac27a0ec
DK		 1264 sb_block = simple_strtoul(options, &options, 0);
1265 if (*options && *options != ',') {
4776004f 1266 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
ac27a0ec
DK		 1267 (char *) *data);
1268 return 1;
1269 }
1270 if (*options == ',')
1271 options++;
1272 *data = (void *) options;
0b8e58a1 1273
ac27a0ec
DK		 1274 return sb_block;
1275}
1276
b3881f74 1277#define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
437ca0fd
DM		 1278static char deprecated_msg[] = "Mount option \"%s\" will be removed by %s\n"
1279 "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
b3881f74 1280
56c50f11
DM		 1281#ifdef CONFIG_QUOTA
1282static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
1283{
1284 struct ext4_sb_info *sbi = EXT4_SB(sb);
1285 char *qname;
1286
1287 if (sb_any_quota_loaded(sb) &&
1288 !sbi->s_qf_names[qtype]) {
1289 ext4_msg(sb, KERN_ERR,
1290 "Cannot change journaled "
1291 "quota options when quota turned on");
1292 return 0;
1293 }
1294 qname = match_strdup(args);
1295 if (!qname) {
1296 ext4_msg(sb, KERN_ERR,
1297 "Not enough memory for storing quotafile name");
1298 return 0;
1299 }
1300 if (sbi->s_qf_names[qtype] &&
1301 strcmp(sbi->s_qf_names[qtype], qname)) {
1302 ext4_msg(sb, KERN_ERR,
1303 "%s quota file already specified", QTYPE2NAME(qtype));
1304 kfree(qname);
1305 return 0;
1306 }
1307 sbi->s_qf_names[qtype] = qname;
1308 if (strchr(sbi->s_qf_names[qtype], '/')) {
1309 ext4_msg(sb, KERN_ERR,
1310 "quotafile must be on filesystem root");
1311 kfree(sbi->s_qf_names[qtype]);
1312 sbi->s_qf_names[qtype] = NULL;
1313 return 0;
1314 }
fd8c37ec 1315 set_opt(sb, QUOTA);
56c50f11
DM		 1316 return 1;
1317}
1318
1319static int clear_qf_name(struct super_block *sb, int qtype)
1320{
1321
1322 struct ext4_sb_info *sbi = EXT4_SB(sb);
1323
1324 if (sb_any_quota_loaded(sb) &&
1325 sbi->s_qf_names[qtype]) {
1326 ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options"
1327 " when quota turned on");
1328 return 0;
1329 }
1330 /*
1331 * The space will be released later when all options are confirmed
1332 * to be correct
1333 */
1334 sbi->s_qf_names[qtype] = NULL;
1335 return 1;
1336}
1337#endif
1338
26092bf5
TT		 1339#define MOPT_SET 0x0001
1340#define MOPT_CLEAR 0x0002
1341#define MOPT_NOSUPPORT 0x0004
1342#define MOPT_EXPLICIT 0x0008
1343#define MOPT_CLEAR_ERR 0x0010
1344#define MOPT_GTE0 0x0020
ac27a0ec 1345#ifdef CONFIG_QUOTA
26092bf5
TT		 1346#define MOPT_Q 0
1347#define MOPT_QFMT 0x0040
1348#else
1349#define MOPT_Q MOPT_NOSUPPORT
1350#define MOPT_QFMT MOPT_NOSUPPORT
ac27a0ec 1351#endif
26092bf5
TT		 1352#define MOPT_DATAJ 0x0080
1353
1354static const struct mount_opts {
1355 int token;
1356 int mount_opt;
1357 int flags;
1358} ext4_mount_opts[] = {
1359 {Opt_minix_df, EXT4_MOUNT_MINIX_DF, MOPT_SET},
1360 {Opt_bsd_df, EXT4_MOUNT_MINIX_DF, MOPT_CLEAR},
1361 {Opt_grpid, EXT4_MOUNT_GRPID, MOPT_SET},
1362 {Opt_nogrpid, EXT4_MOUNT_GRPID, MOPT_CLEAR},
1363 {Opt_mblk_io_submit, EXT4_MOUNT_MBLK_IO_SUBMIT, MOPT_SET},
1364 {Opt_nomblk_io_submit, EXT4_MOUNT_MBLK_IO_SUBMIT, MOPT_CLEAR},
1365 {Opt_block_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_SET},
1366 {Opt_noblock_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_CLEAR},
1367 {Opt_dioread_nolock, EXT4_MOUNT_DIOREAD_NOLOCK, MOPT_SET},
1368 {Opt_dioread_lock, EXT4_MOUNT_DIOREAD_NOLOCK, MOPT_CLEAR},
1369 {Opt_discard, EXT4_MOUNT_DISCARD, MOPT_SET},
1370 {Opt_nodiscard, EXT4_MOUNT_DISCARD, MOPT_CLEAR},
1371 {Opt_delalloc, EXT4_MOUNT_DELALLOC, MOPT_SET | MOPT_EXPLICIT},
1372 {Opt_nodelalloc, EXT4_MOUNT_DELALLOC, MOPT_CLEAR | MOPT_EXPLICIT},
1373 {Opt_journal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM, MOPT_SET},
1374 {Opt_journal_async_commit, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT |
1375 EXT4_MOUNT_JOURNAL_CHECKSUM), MOPT_SET},
1376 {Opt_noload, EXT4_MOUNT_NOLOAD, MOPT_SET},
1377 {Opt_err_panic, EXT4_MOUNT_ERRORS_PANIC, MOPT_SET | MOPT_CLEAR_ERR},
1378 {Opt_err_ro, EXT4_MOUNT_ERRORS_RO, MOPT_SET | MOPT_CLEAR_ERR},
1379 {Opt_err_cont, EXT4_MOUNT_ERRORS_CONT, MOPT_SET | MOPT_CLEAR_ERR},
1380 {Opt_data_err_abort, EXT4_MOUNT_DATA_ERR_ABORT, MOPT_SET},
1381 {Opt_data_err_ignore, EXT4_MOUNT_DATA_ERR_ABORT, MOPT_CLEAR},
1382 {Opt_barrier, EXT4_MOUNT_BARRIER, MOPT_SET},
1383 {Opt_nobarrier, EXT4_MOUNT_BARRIER, MOPT_CLEAR},
1384 {Opt_noauto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_SET},
1385 {Opt_auto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_CLEAR},
1386 {Opt_noinit_itable, EXT4_MOUNT_INIT_INODE_TABLE, MOPT_CLEAR},
1387 {Opt_commit, 0, MOPT_GTE0},
1388 {Opt_max_batch_time, 0, MOPT_GTE0},
1389 {Opt_min_batch_time, 0, MOPT_GTE0},
1390 {Opt_inode_readahead_blks, 0, MOPT_GTE0},
1391 {Opt_init_itable, 0, MOPT_GTE0},
1392 {Opt_stripe, 0, MOPT_GTE0},
1393 {Opt_data_journal, EXT4_MOUNT_JOURNAL_DATA, MOPT_DATAJ},
1394 {Opt_data_ordered, EXT4_MOUNT_ORDERED_DATA, MOPT_DATAJ},
1395 {Opt_data_writeback, EXT4_MOUNT_WRITEBACK_DATA, MOPT_DATAJ},
03010a33 1396#ifdef CONFIG_EXT4_FS_XATTR
26092bf5
TT		 1397 {Opt_user_xattr, EXT4_MOUNT_XATTR_USER, MOPT_SET},
1398 {Opt_nouser_xattr, EXT4_MOUNT_XATTR_USER, MOPT_CLEAR},
ac27a0ec 1399#else
26092bf5
TT		 1400 {Opt_user_xattr, 0, MOPT_NOSUPPORT},
1401 {Opt_nouser_xattr, 0, MOPT_NOSUPPORT},
ac27a0ec 1402#endif
03010a33 1403#ifdef CONFIG_EXT4_FS_POSIX_ACL
26092bf5
TT		 1404 {Opt_acl, EXT4_MOUNT_POSIX_ACL, MOPT_SET},
1405 {Opt_noacl, EXT4_MOUNT_POSIX_ACL, MOPT_CLEAR},
ac27a0ec 1406#else
26092bf5
TT		 1407 {Opt_acl, 0, MOPT_NOSUPPORT},
1408 {Opt_noacl, 0, MOPT_NOSUPPORT},
ac27a0ec 1409#endif
26092bf5
TT		 1410 {Opt_nouid32, EXT4_MOUNT_NO_UID32, MOPT_SET},
1411 {Opt_debug, EXT4_MOUNT_DEBUG, MOPT_SET},
1412 {Opt_quota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA, MOPT_SET | MOPT_Q},
1413 {Opt_usrquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA,
1414 MOPT_SET | MOPT_Q},
1415 {Opt_grpquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_GRPQUOTA,
1416 MOPT_SET | MOPT_Q},
1417 {Opt_noquota, (EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA |
1418 EXT4_MOUNT_GRPQUOTA), MOPT_CLEAR | MOPT_Q},
1419 {Opt_usrjquota, 0, MOPT_Q},
1420 {Opt_grpjquota, 0, MOPT_Q},
1421 {Opt_offusrjquota, 0, MOPT_Q},
1422 {Opt_offgrpjquota, 0, MOPT_Q},
1423 {Opt_jqfmt_vfsold, QFMT_VFS_OLD, MOPT_QFMT},
1424 {Opt_jqfmt_vfsv0, QFMT_VFS_V0, MOPT_QFMT},
1425 {Opt_jqfmt_vfsv1, QFMT_VFS_V1, MOPT_QFMT},
1426 {Opt_err, 0, 0}
1427};
1428
1429static int handle_mount_opt(struct super_block *sb, char *opt, int token,
1430 substring_t *args, unsigned long *journal_devnum,
1431 unsigned int *journal_ioprio, int is_remount)
1432{
1433 struct ext4_sb_info *sbi = EXT4_SB(sb);
1434 const struct mount_opts *m;
1435 int arg = 0;
1436
1437 if (args->from && match_int(args, &arg))
1438 return -1;
1439 switch (token) {
1440 case Opt_sb:
1441 return 1; /* handled by get_sb_block() */
1442 case Opt_removed:
1443 ext4_msg(sb, KERN_WARNING,
1444 "Ignoring removed %s option", opt);
1445 return 1;
1446 case Opt_resuid:
1447 sbi->s_resuid = arg;
1448 return 1;
1449 case Opt_resgid:
1450 sbi->s_resgid = arg;
1451 return 1;
1452 case Opt_abort:
1453 sbi->s_mount_flags |= EXT4_MF_FS_ABORTED;
1454 return 1;
1455 case Opt_i_version:
1456 sb->s_flags |= MS_I_VERSION;
1457 return 1;
1458 case Opt_journal_dev:
1459 if (is_remount) {
1460 ext4_msg(sb, KERN_ERR,
1461 "Cannot specify journal on remount");
1462 return -1;
1463 }
1464 *journal_devnum = arg;
1465 return 1;
1466 case Opt_journal_ioprio:
1467 if (arg < 0 || arg > 7)
1468 return -1;
1469 *journal_ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, arg);
1470 return 1;
1471 }
1472
1473 for (m = ext4_mount_opts; m->token != Opt_err; m++) {
1474 if (token != m->token)
1475 continue;
1476 if (args->from && (m->flags & MOPT_GTE0) && (arg < 0))
1477 return -1;
1478 if (m->flags & MOPT_EXPLICIT)
1479 set_opt2(sb, EXPLICIT_DELALLOC);
1480 if (m->flags & MOPT_CLEAR_ERR)
1481 clear_opt(sb, ERRORS_MASK);
1482 if (token == Opt_noquota && sb_any_quota_loaded(sb)) {
1483 ext4_msg(sb, KERN_ERR, "Cannot change quota "
1484 "options when quota turned on");
1485 return -1;
1486 }
1487
1488 if (m->flags & MOPT_NOSUPPORT) {
1489 ext4_msg(sb, KERN_ERR, "%s option not supported", opt);
1490 } else if (token == Opt_commit) {
1491 if (arg == 0)
1492 arg = JBD2_DEFAULT_MAX_COMMIT_AGE;
1493 sbi->s_commit_interval = HZ * arg;
1494 } else if (token == Opt_max_batch_time) {
1495 if (arg == 0)
1496 arg = EXT4_DEF_MAX_BATCH_TIME;
1497 sbi->s_max_batch_time = arg;
1498 } else if (token == Opt_min_batch_time) {
1499 sbi->s_min_batch_time = arg;
1500 } else if (token == Opt_inode_readahead_blks) {
1501 if (arg > (1 << 30))
1502 return -1;
1503 if (arg && !is_power_of_2(arg)) {
b31e1552 1504 ext4_msg(sb, KERN_ERR,
26092bf5
TT		 1505 "EXT4-fs: inode_readahead_blks"
1506 " must be a power of 2");
1507 return -1;
ac27a0ec 1508 }
26092bf5
TT		 1509 sbi->s_inode_readahead_blks = arg;
1510 } else if (token == Opt_init_itable) {
1511 set_opt(sb, INIT_INODE_TABLE);
1512 if (!args->from)
1513 arg = EXT4_DEF_LI_WAIT_MULT;
1514 sbi->s_li_wait_mult = arg;
1515 } else if (token == Opt_stripe) {
1516 sbi->s_stripe = arg;
1517 } else if (m->flags & MOPT_DATAJ) {
ac27a0ec 1518 if (is_remount) {
eb513689
TT		 1519 if (!sbi->s_journal)
1520 ext4_msg(sb, KERN_WARNING, "Remounting file system with no journal so ignoring journalled data option");
26092bf5
TT		 1521 else if (test_opt(sb, DATA_FLAGS) !=
1522 m->mount_opt) {
b31e1552 1523 ext4_msg(sb, KERN_ERR,
26092bf5
TT		 1524 "Cannot change data mode on remount");
1525 return -1;
ac27a0ec
DK		 1526 }
1527 } else {
fd8c37ec 1528 clear_opt(sb, DATA_FLAGS);
26092bf5 1529 sbi->s_mount_opt |= m->mount_opt;
ac27a0ec 1530 }
ac27a0ec 1531#ifdef CONFIG_QUOTA
26092bf5 1532 } else if (token == Opt_usrjquota) {
56c50f11 1533 if (!set_qf_name(sb, USRQUOTA, &args[0]))
26092bf5
TT		 1534 return -1;
1535 } else if (token == Opt_grpjquota) {
56c50f11 1536 if (!set_qf_name(sb, GRPQUOTA, &args[0]))
26092bf5
TT		 1537 return -1;
1538 } else if (token == Opt_offusrjquota) {
56c50f11 1539 if (!clear_qf_name(sb, USRQUOTA))
26092bf5
TT		 1540 return -1;
1541 } else if (token == Opt_offgrpjquota) {
56c50f11 1542 if (!clear_qf_name(sb, GRPQUOTA))
26092bf5
TT		 1543 return -1;
1544 } else if (m->flags & MOPT_QFMT) {
17bd13b3 1545 if (sb_any_quota_loaded(sb) &&
26092bf5
TT		 1546 sbi->s_jquota_fmt != m->mount_opt) {
1547 ext4_msg(sb, KERN_ERR, "Cannot "
1548 "change journaled quota options "
1549 "when quota turned on");
1550 return -1;
dfc5d03f 1551 }
26092bf5 1552 sbi->s_jquota_fmt = m->mount_opt;
ac27a0ec 1553#endif
26092bf5
TT		 1554 } else {
1555 if (!args->from)
1556 arg = 1;
1557 if (m->flags & MOPT_CLEAR)
1558 arg = !arg;
1559 else if (unlikely(!(m->flags & MOPT_SET))) {
1560 ext4_msg(sb, KERN_WARNING,
1561 "buggy handling of option %s", opt);
1562 WARN_ON(1);
1563 return -1;
3197ebdb 1564 }
26092bf5
TT		 1565 if (arg != 0)
1566 sbi->s_mount_opt |= m->mount_opt;
afd4672d 1567 else
26092bf5 1568 sbi->s_mount_opt &= ~m->mount_opt;
ac27a0ec 1569 }
26092bf5
TT		 1570 return 1;
1571 }
1572 ext4_msg(sb, KERN_ERR, "Unrecognized mount option \"%s\" "
1573 "or missing value", opt);
1574 return -1;
1575}
1576
1577static int parse_options(char *options, struct super_block *sb,
1578 unsigned long *journal_devnum,
1579 unsigned int *journal_ioprio,
1580 int is_remount)
1581{
1582 struct ext4_sb_info *sbi = EXT4_SB(sb);
1583 char *p;
1584 substring_t args[MAX_OPT_ARGS];
1585 int token;
1586
1587 if (!options)
1588 return 1;
1589
1590 while ((p = strsep(&options, ",")) != NULL) {
1591 if (!*p)
1592 continue;
1593 /*
1594 * Initialize args struct so we know whether arg was
1595 * found; some options take optional arguments.
1596 */
1597 args[0].to = args[0].from = 0;
1598 token = match_token(p, tokens, args);
1599 if (handle_mount_opt(sb, p, token, args, journal_devnum,
1600 journal_ioprio, is_remount) < 0)
1601 return 0;
ac27a0ec
DK		 1602 }
1603#ifdef CONFIG_QUOTA
1604 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
482a7425 1605 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
fd8c37ec 1606 clear_opt(sb, USRQUOTA);
ac27a0ec 1607
482a7425 1608 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
fd8c37ec 1609 clear_opt(sb, GRPQUOTA);
ac27a0ec 1610
56c50f11 1611 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
b31e1552
ES		 1612 ext4_msg(sb, KERN_ERR, "old and new quota "
1613 "format mixing");
ac27a0ec
DK		 1614 return 0;
1615 }
1616
1617 if (!sbi->s_jquota_fmt) {
b31e1552
ES		 1618 ext4_msg(sb, KERN_ERR, "journaled quota format "
1619 "not specified");
ac27a0ec
DK		 1620 return 0;
1621 }
1622 } else {
1623 if (sbi->s_jquota_fmt) {
b31e1552 1624 ext4_msg(sb, KERN_ERR, "journaled quota format "
2c8be6b2 1625 "specified with no journaling "
b31e1552 1626 "enabled");
ac27a0ec
DK		 1627 return 0;
1628 }
1629 }
1630#endif
1631 return 1;
1632}
1633
2adf6da8
TT		 1634static inline void ext4_show_quota_options(struct seq_file *seq,
1635 struct super_block *sb)
1636{
1637#if defined(CONFIG_QUOTA)
1638 struct ext4_sb_info *sbi = EXT4_SB(sb);
1639
1640 if (sbi->s_jquota_fmt) {
1641 char *fmtname = "";
1642
1643 switch (sbi->s_jquota_fmt) {
1644 case QFMT_VFS_OLD:
1645 fmtname = "vfsold";
1646 break;
1647 case QFMT_VFS_V0:
1648 fmtname = "vfsv0";
1649 break;
1650 case QFMT_VFS_V1:
1651 fmtname = "vfsv1";
1652 break;
1653 }
1654 seq_printf(seq, ",jqfmt=%s", fmtname);
1655 }
1656
1657 if (sbi->s_qf_names[USRQUOTA])
1658 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
1659
1660 if (sbi->s_qf_names[GRPQUOTA])
1661 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
1662
1663 if (test_opt(sb, USRQUOTA))
1664 seq_puts(seq, ",usrquota");
1665
1666 if (test_opt(sb, GRPQUOTA))
1667 seq_puts(seq, ",grpquota");
1668#endif
1669}
1670
1671/*
1672 * Show an option if
1673 * - it's set to a non-default value OR
1674 * - if the per-sb default is different from the global default
1675 */
1676static int ext4_show_options(struct seq_file *seq, struct dentry *root)
1677{
1678 int def_errors;
1679 unsigned long def_mount_opts;
1680 struct super_block *sb = root->d_sb;
1681 struct ext4_sb_info *sbi = EXT4_SB(sb);
1682 struct ext4_super_block *es = sbi->s_es;
1683
1684 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
1685 def_errors = le16_to_cpu(es->s_errors);
1686
1687 if (sbi->s_sb_block != 1)
1688 seq_printf(seq, ",sb=%llu", sbi->s_sb_block);
1689 if (test_opt(sb, MINIX_DF))
1690 seq_puts(seq, ",minixdf");
1691 if (test_opt(sb, GRPID) && !(def_mount_opts & EXT4_DEFM_BSDGROUPS))
1692 seq_puts(seq, ",grpid");
1693 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT4_DEFM_BSDGROUPS))
1694 seq_puts(seq, ",nogrpid");
1695 if (sbi->s_resuid != EXT4_DEF_RESUID ||
1696 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID) {
1697 seq_printf(seq, ",resuid=%u", sbi->s_resuid);
1698 }
1699 if (sbi->s_resgid != EXT4_DEF_RESGID ||
1700 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID) {
1701 seq_printf(seq, ",resgid=%u", sbi->s_resgid);
1702 }
1703 if (test_opt(sb, ERRORS_RO)) {
1704 if (def_errors == EXT4_ERRORS_PANIC ||
1705 def_errors == EXT4_ERRORS_CONTINUE) {
1706 seq_puts(seq, ",errors=remount-ro");
1707 }
1708 }
1709 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
1710 seq_puts(seq, ",errors=continue");
1711 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
1712 seq_puts(seq, ",errors=panic");
1713 if (test_opt(sb, NO_UID32) && !(def_mount_opts & EXT4_DEFM_UID16))
1714 seq_puts(seq, ",nouid32");
1715 if (test_opt(sb, DEBUG) && !(def_mount_opts & EXT4_DEFM_DEBUG))
1716 seq_puts(seq, ",debug");
1717#ifdef CONFIG_EXT4_FS_XATTR
1718 if (test_opt(sb, XATTR_USER))
1719 seq_puts(seq, ",user_xattr");
1720 if (!test_opt(sb, XATTR_USER))
1721 seq_puts(seq, ",nouser_xattr");
1722#endif
1723#ifdef CONFIG_EXT4_FS_POSIX_ACL
1724 if (test_opt(sb, POSIX_ACL) && !(def_mount_opts & EXT4_DEFM_ACL))
1725 seq_puts(seq, ",acl");
1726 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT4_DEFM_ACL))
1727 seq_puts(seq, ",noacl");
1728#endif
1729 if (sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) {
1730 seq_printf(seq, ",commit=%u",
1731 (unsigned) (sbi->s_commit_interval / HZ));
1732 }
1733 if (sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME) {
1734 seq_printf(seq, ",min_batch_time=%u",
1735 (unsigned) sbi->s_min_batch_time);
1736 }
1737 if (sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME) {
1738 seq_printf(seq, ",max_batch_time=%u",
1739 (unsigned) sbi->s_max_batch_time);
1740 }
1741
1742 /*
1743 * We're changing the default of barrier mount option, so
1744 * let's always display its mount state so it's clear what its
1745 * status is.
1746 */
1747 seq_puts(seq, ",barrier=");
1748 seq_puts(seq, test_opt(sb, BARRIER) ? "1" : "0");
1749 if (test_opt(sb, JOURNAL_ASYNC_COMMIT))
1750 seq_puts(seq, ",journal_async_commit");
1751 else if (test_opt(sb, JOURNAL_CHECKSUM))
1752 seq_puts(seq, ",journal_checksum");
1753 if (sb->s_flags & MS_I_VERSION)
1754 seq_puts(seq, ",i_version");
1755 if (!test_opt(sb, DELALLOC) &&
1756 !(def_mount_opts & EXT4_DEFM_NODELALLOC))
1757 seq_puts(seq, ",nodelalloc");
1758
1759 if (!test_opt(sb, MBLK_IO_SUBMIT))
1760 seq_puts(seq, ",nomblk_io_submit");
1761 if (sbi->s_stripe)
1762 seq_printf(seq, ",stripe=%lu", sbi->s_stripe);
1763 /*
1764 * journal mode get enabled in different ways
1765 * So just print the value even if we didn't specify it
1766 */
1767 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
1768 seq_puts(seq, ",data=journal");
1769 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
1770 seq_puts(seq, ",data=ordered");
1771 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
1772 seq_puts(seq, ",data=writeback");
1773
1774 if (sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
1775 seq_printf(seq, ",inode_readahead_blks=%u",
1776 sbi->s_inode_readahead_blks);
1777
1778 if (test_opt(sb, DATA_ERR_ABORT))
1779 seq_puts(seq, ",data_err=abort");
1780
1781 if (test_opt(sb, NO_AUTO_DA_ALLOC))
1782 seq_puts(seq, ",noauto_da_alloc");
1783
1784 if (test_opt(sb, DISCARD) && !(def_mount_opts & EXT4_DEFM_DISCARD))
1785 seq_puts(seq, ",discard");
1786
1787 if (test_opt(sb, NOLOAD))
1788 seq_puts(seq, ",norecovery");
1789
1790 if (test_opt(sb, DIOREAD_NOLOCK))
1791 seq_puts(seq, ",dioread_nolock");
1792
1793 if (test_opt(sb, BLOCK_VALIDITY) &&
1794 !(def_mount_opts & EXT4_DEFM_BLOCK_VALIDITY))
1795 seq_puts(seq, ",block_validity");
1796
1797 if (!test_opt(sb, INIT_INODE_TABLE))
1798 seq_puts(seq, ",noinit_itable");
1799 else if (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT)
1800 seq_printf(seq, ",init_itable=%u",
1801 (unsigned) sbi->s_li_wait_mult);
1802
1803 ext4_show_quota_options(seq, sb);
1804
1805 return 0;
1806}
1807
617ba13b 1808static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
ac27a0ec
DK		 1809 int read_only)
1810{
617ba13b 1811 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec
DK		 1812 int res = 0;
1813
617ba13b 1814 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
b31e1552
ES		 1815 ext4_msg(sb, KERN_ERR, "revision level too high, "
1816 "forcing read-only mode");
ac27a0ec
DK		 1817 res = MS_RDONLY;
1818 }
1819 if (read_only)
281b5995 1820 goto done;
617ba13b 1821 if (!(sbi->s_mount_state & EXT4_VALID_FS))
b31e1552
ES		 1822 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
1823 "running e2fsck is recommended");
617ba13b 1824 else if ((sbi->s_mount_state & EXT4_ERROR_FS))
b31e1552
ES		 1825 ext4_msg(sb, KERN_WARNING,
1826 "warning: mounting fs with errors, "
1827 "running e2fsck is recommended");
ed3ce80a 1828 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
ac27a0ec
DK		 1829 le16_to_cpu(es->s_mnt_count) >=
1830 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
b31e1552
ES		 1831 ext4_msg(sb, KERN_WARNING,
1832 "warning: maximal mount count reached, "
1833 "running e2fsck is recommended");
ac27a0ec
DK		 1834 else if (le32_to_cpu(es->s_checkinterval) &&
1835 (le32_to_cpu(es->s_lastcheck) +
1836 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
b31e1552
ES		 1837 ext4_msg(sb, KERN_WARNING,
1838 "warning: checktime reached, "
1839 "running e2fsck is recommended");
0b8e58a1 1840 if (!sbi->s_journal)
0390131b 1841 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
ac27a0ec 1842 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
617ba13b 1843 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
e8546d06 1844 le16_add_cpu(&es->s_mnt_count, 1);
ac27a0ec 1845 es->s_mtime = cpu_to_le32(get_seconds());
617ba13b 1846 ext4_update_dynamic_rev(sb);
0390131b
FM		 1847 if (sbi->s_journal)
1848 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
ac27a0ec 1849
e2d67052 1850 ext4_commit_super(sb, 1);
281b5995 1851done:
ac27a0ec 1852 if (test_opt(sb, DEBUG))
a9df9a49 1853 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
a2595b8a 1854 "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
ac27a0ec
DK		 1855 sb->s_blocksize,
1856 sbi->s_groups_count,
617ba13b
MC		 1857 EXT4_BLOCKS_PER_GROUP(sb),
1858 EXT4_INODES_PER_GROUP(sb),
a2595b8a 1859 sbi->s_mount_opt, sbi->s_mount_opt2);
ac27a0ec 1860
7abc52c2 1861 cleancache_init_fs(sb);
ac27a0ec
DK		 1862 return res;
1863}
1864
772cb7c8
JS		 1865static int ext4_fill_flex_info(struct super_block *sb)
1866{
1867 struct ext4_sb_info *sbi = EXT4_SB(sb);
1868 struct ext4_group_desc *gdp = NULL;
772cb7c8
JS		 1869 ext4_group_t flex_group_count;
1870 ext4_group_t flex_group;
d50f2ab6 1871 unsigned int groups_per_flex = 0;
c5ca7c76 1872 size_t size;
772cb7c8
JS		 1873 int i;
1874
503358ae 1875 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
d50f2ab6 1876 if (sbi->s_log_groups_per_flex < 1 || sbi->s_log_groups_per_flex > 31) {
772cb7c8
JS		 1877 sbi->s_log_groups_per_flex = 0;
1878 return 1;
1879 }
d50f2ab6 1880 groups_per_flex = 1 << sbi->s_log_groups_per_flex;
772cb7c8 1881
c62a11fd
FB		 1882 /* We allocate both existing and potentially added groups */
1883 flex_group_count = ((sbi->s_groups_count + groups_per_flex - 1) +
d94e99a6
AK		 1884 ((le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) + 1) <<
1885 EXT4_DESC_PER_BLOCK_BITS(sb))) / groups_per_flex;
c5ca7c76 1886 size = flex_group_count * sizeof(struct flex_groups);
9933fc0a 1887 sbi->s_flex_groups = ext4_kvzalloc(size, GFP_KERNEL);
c5ca7c76 1888 if (sbi->s_flex_groups == NULL) {
9933fc0a
TT		 1889 ext4_msg(sb, KERN_ERR, "not enough memory for %u flex groups",
1890 flex_group_count);
1891 goto failed;
772cb7c8 1892 }
772cb7c8 1893
772cb7c8 1894 for (i = 0; i < sbi->s_groups_count; i++) {
88b6edd1 1895 gdp = ext4_get_group_desc(sb, i, NULL);
772cb7c8
JS		 1896
1897 flex_group = ext4_flex_group(sbi, i);
7ad9bb65
TT		 1898 atomic_add(ext4_free_inodes_count(sb, gdp),
1899 &sbi->s_flex_groups[flex_group].free_inodes);
021b65bb 1900 atomic_add(ext4_free_group_clusters(sb, gdp),
24aaa8ef 1901 &sbi->s_flex_groups[flex_group].free_clusters);
7ad9bb65
TT		 1902 atomic_add(ext4_used_dirs_count(sb, gdp),
1903 &sbi->s_flex_groups[flex_group].used_dirs);
772cb7c8
JS		 1904 }
1905
1906 return 1;
1907failed:
1908 return 0;
1909}
1910
717d50e4
AD		 1911__le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
1912 struct ext4_group_desc *gdp)
1913{
1914 __u16 crc = 0;
1915
1916 if (sbi->s_es->s_feature_ro_compat &
1917 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) {
1918 int offset = offsetof(struct ext4_group_desc, bg_checksum);
1919 __le32 le_group = cpu_to_le32(block_group);
1920
1921 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
1922 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
1923 crc = crc16(crc, (__u8 *)gdp, offset);
1924 offset += sizeof(gdp->bg_checksum); /* skip checksum */
1925 /* for checksum of struct ext4_group_desc do the rest...*/
1926 if ((sbi->s_es->s_feature_incompat &
1927 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) &&
1928 offset < le16_to_cpu(sbi->s_es->s_desc_size))
1929 crc = crc16(crc, (__u8 *)gdp + offset,
1930 le16_to_cpu(sbi->s_es->s_desc_size) -
1931 offset);
1932 }
1933
1934 return cpu_to_le16(crc);
1935}
1936
1937int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 block_group,
1938 struct ext4_group_desc *gdp)
1939{
1940 if ((sbi->s_es->s_feature_ro_compat &
1941 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) &&
1942 (gdp->bg_checksum != ext4_group_desc_csum(sbi, block_group, gdp)))
1943 return 0;
1944
1945 return 1;
1946}
1947
ac27a0ec 1948/* Called at mount-time, super-block is locked */
bfff6873
LC		 1949static int ext4_check_descriptors(struct super_block *sb,
1950 ext4_group_t *first_not_zeroed)
ac27a0ec 1951{
617ba13b
MC		 1952 struct ext4_sb_info *sbi = EXT4_SB(sb);
1953 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
1954 ext4_fsblk_t last_block;
bd81d8ee
LV		 1955 ext4_fsblk_t block_bitmap;
1956 ext4_fsblk_t inode_bitmap;
1957 ext4_fsblk_t inode_table;
ce421581 1958 int flexbg_flag = 0;
bfff6873 1959 ext4_group_t i, grp = sbi->s_groups_count;
ac27a0ec 1960
ce421581
JS		 1961 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
1962 flexbg_flag = 1;
1963
af5bc92d 1964 ext4_debug("Checking group descriptors");
ac27a0ec 1965
197cd65a
AM		 1966 for (i = 0; i < sbi->s_groups_count; i++) {
1967 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
1968
ce421581 1969 if (i == sbi->s_groups_count - 1 || flexbg_flag)
bd81d8ee 1970 last_block = ext4_blocks_count(sbi->s_es) - 1;
ac27a0ec
DK		 1971 else
1972 last_block = first_block +
617ba13b 1973 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
ac27a0ec 1974
bfff6873
LC		 1975 if ((grp == sbi->s_groups_count) &&
1976 !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
1977 grp = i;
1978
8fadc143 1979 block_bitmap = ext4_block_bitmap(sb, gdp);
2b2d6d01 1980 if (block_bitmap < first_block || block_bitmap > last_block) {
b31e1552 1981 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 1982 "Block bitmap for group %u not in group "
b31e1552 1983 "(block %llu)!", i, block_bitmap);
ac27a0ec
DK		 1984 return 0;
1985 }
8fadc143 1986 inode_bitmap = ext4_inode_bitmap(sb, gdp);
2b2d6d01 1987 if (inode_bitmap < first_block || inode_bitmap > last_block) {
b31e1552 1988 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 1989 "Inode bitmap for group %u not in group "
b31e1552 1990 "(block %llu)!", i, inode_bitmap);
ac27a0ec
DK		 1991 return 0;
1992 }
8fadc143 1993 inode_table = ext4_inode_table(sb, gdp);
bd81d8ee 1994 if (inode_table < first_block ||
2b2d6d01 1995 inode_table + sbi->s_itb_per_group - 1 > last_block) {
b31e1552 1996 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 1997 "Inode table for group %u not in group "
b31e1552 1998 "(block %llu)!", i, inode_table);
ac27a0ec
DK		 1999 return 0;
2000 }
955ce5f5 2001 ext4_lock_group(sb, i);
717d50e4 2002 if (!ext4_group_desc_csum_verify(sbi, i, gdp)) {
b31e1552
ES		 2003 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2004 "Checksum for group %u failed (%u!=%u)",
2005 i, le16_to_cpu(ext4_group_desc_csum(sbi, i,
2006 gdp)), le16_to_cpu(gdp->bg_checksum));
7ee1ec4c 2007 if (!(sb->s_flags & MS_RDONLY)) {
955ce5f5 2008 ext4_unlock_group(sb, i);
8a266467 2009 return 0;
7ee1ec4c 2010 }
717d50e4 2011 }
955ce5f5 2012 ext4_unlock_group(sb, i);
ce421581
JS		 2013 if (!flexbg_flag)
2014 first_block += EXT4_BLOCKS_PER_GROUP(sb);
ac27a0ec 2015 }
bfff6873
LC		 2016 if (NULL != first_not_zeroed)
2017 *first_not_zeroed = grp;
ac27a0ec 2018
5dee5437
TT		 2019 ext4_free_blocks_count_set(sbi->s_es,
2020 EXT4_C2B(sbi, ext4_count_free_clusters(sb)));
0b8e58a1 2021 sbi->s_es->s_free_inodes_count =cpu_to_le32(ext4_count_free_inodes(sb));
ac27a0ec
DK		 2022 return 1;
2023}
2024
617ba13b 2025/* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
ac27a0ec
DK		 2026 * the superblock) which were deleted from all directories, but held open by
2027 * a process at the time of a crash. We walk the list and try to delete these
2028 * inodes at recovery time (only with a read-write filesystem).
2029 *
2030 * In order to keep the orphan inode chain consistent during traversal (in
2031 * case of crash during recovery), we link each inode into the superblock
2032 * orphan list_head and handle it the same way as an inode deletion during
2033 * normal operation (which journals the operations for us).
2034 *
2035 * We only do an iget() and an iput() on each inode, which is very safe if we
2036 * accidentally point at an in-use or already deleted inode. The worst that
2037 * can happen in this case is that we get a "bit already cleared" message from
617ba13b 2038 * ext4_free_inode(). The only reason we would point at a wrong inode is if
ac27a0ec
DK		 2039 * e2fsck was run on this filesystem, and it must have already done the orphan
2040 * inode cleanup for us, so we can safely abort without any further action.
2041 */
2b2d6d01
TT		 2042static void ext4_orphan_cleanup(struct super_block *sb,
2043 struct ext4_super_block *es)
ac27a0ec
DK		 2044{
2045 unsigned int s_flags = sb->s_flags;
2046 int nr_orphans = 0, nr_truncates = 0;
2047#ifdef CONFIG_QUOTA
2048 int i;
2049#endif
2050 if (!es->s_last_orphan) {
2051 jbd_debug(4, "no orphan inodes to clean up\n");
2052 return;
2053 }
2054
a8f48a95 2055 if (bdev_read_only(sb->s_bdev)) {
b31e1552
ES		 2056 ext4_msg(sb, KERN_ERR, "write access "
2057 "unavailable, skipping orphan cleanup");
a8f48a95
ES		 2058 return;
2059 }
2060
d39195c3
AG		 2061 /* Check if feature set would not allow a r/w mount */
2062 if (!ext4_feature_set_ok(sb, 0)) {
2063 ext4_msg(sb, KERN_INFO, "Skipping orphan cleanup due to "
2064 "unknown ROCOMPAT features");
2065 return;
2066 }
2067
617ba13b 2068 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
ac27a0ec
DK		 2069 if (es->s_last_orphan)
2070 jbd_debug(1, "Errors on filesystem, "
2071 "clearing orphan list.\n");
2072 es->s_last_orphan = 0;
2073 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2074 return;
2075 }
2076
2077 if (s_flags & MS_RDONLY) {
b31e1552 2078 ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
ac27a0ec
DK		 2079 sb->s_flags &= ~MS_RDONLY;
2080 }
2081#ifdef CONFIG_QUOTA
2082 /* Needed for iput() to work correctly and not trash data */
2083 sb->s_flags |= MS_ACTIVE;
2084 /* Turn on quotas so that they are updated correctly */
2085 for (i = 0; i < MAXQUOTAS; i++) {
617ba13b
MC		 2086 if (EXT4_SB(sb)->s_qf_names[i]) {
2087 int ret = ext4_quota_on_mount(sb, i);
ac27a0ec 2088 if (ret < 0)
b31e1552
ES		 2089 ext4_msg(sb, KERN_ERR,
2090 "Cannot turn on journaled "
2091 "quota: error %d", ret);
ac27a0ec
DK		 2092 }
2093 }
2094#endif
2095
2096 while (es->s_last_orphan) {
2097 struct inode *inode;
2098
97bd42b9
JB		 2099 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
2100 if (IS_ERR(inode)) {
ac27a0ec
DK		 2101 es->s_last_orphan = 0;
2102 break;
2103 }
2104
617ba13b 2105 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
871a2931 2106 dquot_initialize(inode);
ac27a0ec 2107 if (inode->i_nlink) {
b31e1552
ES		 2108 ext4_msg(sb, KERN_DEBUG,
2109 "%s: truncating inode %lu to %lld bytes",
46e665e9 2110 __func__, inode->i_ino, inode->i_size);
e5f8eab8 2111 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
ac27a0ec 2112 inode->i_ino, inode->i_size);
617ba13b 2113 ext4_truncate(inode);
ac27a0ec
DK		 2114 nr_truncates++;
2115 } else {
b31e1552
ES		 2116 ext4_msg(sb, KERN_DEBUG,
2117 "%s: deleting unreferenced inode %lu",
46e665e9 2118 __func__, inode->i_ino);
ac27a0ec
DK		 2119 jbd_debug(2, "deleting unreferenced inode %lu\n",
2120 inode->i_ino);
2121 nr_orphans++;
2122 }
2123 iput(inode); /* The delete magic happens here! */
2124 }
2125
2b2d6d01 2126#define PLURAL(x) (x), ((x) == 1) ? "" : "s"
ac27a0ec
DK		 2127
2128 if (nr_orphans)
b31e1552
ES		 2129 ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
2130 PLURAL(nr_orphans));
ac27a0ec 2131 if (nr_truncates)
b31e1552
ES		 2132 ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
2133 PLURAL(nr_truncates));
ac27a0ec
DK		 2134#ifdef CONFIG_QUOTA
2135 /* Turn quotas off */
2136 for (i = 0; i < MAXQUOTAS; i++) {
2137 if (sb_dqopt(sb)->files[i])
287a8095 2138 dquot_quota_off(sb, i);
ac27a0ec
DK		 2139 }
2140#endif
2141 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
2142}
0b8e58a1 2143
cd2291a4
ES		 2144/*
2145 * Maximal extent format file size.
2146 * Resulting logical blkno at s_maxbytes must fit in our on-disk
2147 * extent format containers, within a sector_t, and within i_blocks
2148 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
2149 * so that won't be a limiting factor.
2150 *
f17722f9
LC		 2151 * However there is other limiting factor. We do store extents in the form
2152 * of starting block and length, hence the resulting length of the extent
2153 * covering maximum file size must fit into on-disk format containers as
2154 * well. Given that length is always by 1 unit bigger than max unit (because
2155 * we count 0 as well) we have to lower the s_maxbytes by one fs block.
2156 *
cd2291a4
ES		 2157 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
2158 */
f287a1a5 2159static loff_t ext4_max_size(int blkbits, int has_huge_files)
cd2291a4
ES		 2160{
2161 loff_t res;
2162 loff_t upper_limit = MAX_LFS_FILESIZE;
2163
2164 /* small i_blocks in vfs inode? */
f287a1a5 2165 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
cd2291a4 2166 /*
90c699a9 2167 * CONFIG_LBDAF is not enabled implies the inode
cd2291a4
ES		 2168 * i_block represent total blocks in 512 bytes
2169 * 32 == size of vfs inode i_blocks * 8
2170 */
2171 upper_limit = (1LL << 32) - 1;
2172
2173 /* total blocks in file system block size */
2174 upper_limit >>= (blkbits - 9);
2175 upper_limit <<= blkbits;
2176 }
2177
f17722f9
LC		 2178 /*
2179 * 32-bit extent-start container, ee_block. We lower the maxbytes
2180 * by one fs block, so ee_len can cover the extent of maximum file
2181 * size
2182 */
2183 res = (1LL << 32) - 1;
cd2291a4 2184 res <<= blkbits;
cd2291a4
ES		 2185
2186 /* Sanity check against vm- & vfs- imposed limits */
2187 if (res > upper_limit)
2188 res = upper_limit;
2189
2190 return res;
2191}
ac27a0ec 2192
ac27a0ec 2193/*
cd2291a4 2194 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
0fc1b451
AK		 2195 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2196 * We need to be 1 filesystem block less than the 2^48 sector limit.
ac27a0ec 2197 */
f287a1a5 2198static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
ac27a0ec 2199{
617ba13b 2200 loff_t res = EXT4_NDIR_BLOCKS;
0fc1b451
AK		 2201 int meta_blocks;
2202 loff_t upper_limit;
0b8e58a1
AD		 2203 /* This is calculated to be the largest file size for a dense, block
2204 * mapped file such that the file's total number of 512-byte sectors,
2205 * including data and all indirect blocks, does not exceed (2^48 - 1).
2206 *
2207 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2208 * number of 512-byte sectors of the file.
0fc1b451
AK		 2209 */
2210
f287a1a5 2211 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
0fc1b451 2212 /*
90c699a9 2213 * !has_huge_files or CONFIG_LBDAF not enabled implies that
0b8e58a1
AD		 2214 * the inode i_block field represents total file blocks in
2215 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
0fc1b451
AK		 2216 */
2217 upper_limit = (1LL << 32) - 1;
2218
2219 /* total blocks in file system block size */
2220 upper_limit >>= (bits - 9);
2221
2222 } else {
8180a562
AK		 2223 /*
2224 * We use 48 bit ext4_inode i_blocks
2225 * With EXT4_HUGE_FILE_FL set the i_blocks
2226 * represent total number of blocks in
2227 * file system block size
2228 */
0fc1b451
AK		 2229 upper_limit = (1LL << 48) - 1;
2230
0fc1b451
AK		 2231 }
2232
2233 /* indirect blocks */
2234 meta_blocks = 1;
2235 /* double indirect blocks */
2236 meta_blocks += 1 + (1LL << (bits-2));
2237 /* tripple indirect blocks */
2238 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
2239
2240 upper_limit -= meta_blocks;
2241 upper_limit <<= bits;
ac27a0ec
DK		 2242
2243 res += 1LL << (bits-2);
2244 res += 1LL << (2*(bits-2));
2245 res += 1LL << (3*(bits-2));
2246 res <<= bits;
2247 if (res > upper_limit)
2248 res = upper_limit;
0fc1b451
AK		 2249
2250 if (res > MAX_LFS_FILESIZE)
2251 res = MAX_LFS_FILESIZE;
2252
ac27a0ec
DK		 2253 return res;
2254}
2255
617ba13b 2256static ext4_fsblk_t descriptor_loc(struct super_block *sb,
0b8e58a1 2257 ext4_fsblk_t logical_sb_block, int nr)
ac27a0ec 2258{
617ba13b 2259 struct ext4_sb_info *sbi = EXT4_SB(sb);
fd2d4291 2260 ext4_group_t bg, first_meta_bg;
ac27a0ec
DK		 2261 int has_super = 0;
2262
2263 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
2264
617ba13b 2265 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
ac27a0ec 2266 nr < first_meta_bg)
70bbb3e0 2267 return logical_sb_block + nr + 1;
ac27a0ec 2268 bg = sbi->s_desc_per_block * nr;
617ba13b 2269 if (ext4_bg_has_super(sb, bg))
ac27a0ec 2270 has_super = 1;
0b8e58a1 2271
617ba13b 2272 return (has_super + ext4_group_first_block_no(sb, bg));
ac27a0ec
DK		 2273}
2274
c9de560d
AT		 2275/**
2276 * ext4_get_stripe_size: Get the stripe size.
2277 * @sbi: In memory super block info
2278 *
2279 * If we have specified it via mount option, then
2280 * use the mount option value. If the value specified at mount time is
2281 * greater than the blocks per group use the super block value.
2282 * If the super block value is greater than blocks per group return 0.
2283 * Allocator needs it be less than blocks per group.
2284 *
2285 */
2286static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
2287{
2288 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
2289 unsigned long stripe_width =
2290 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
3eb08658 2291 int ret;
c9de560d
AT		 2292
2293 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
3eb08658
DE		 2294 ret = sbi->s_stripe;
2295 else if (stripe_width <= sbi->s_blocks_per_group)
2296 ret = stripe_width;
2297 else if (stride <= sbi->s_blocks_per_group)
2298 ret = stride;
2299 else
2300 ret = 0;
c9de560d 2301
3eb08658
DE		 2302 /*
2303 * If the stripe width is 1, this makes no sense and
2304 * we set it to 0 to turn off stripe handling code.
2305 */
2306 if (ret <= 1)
2307 ret = 0;
c9de560d 2308
3eb08658 2309 return ret;
c9de560d 2310}
ac27a0ec 2311
3197ebdb
TT		 2312/* sysfs supprt */
2313
2314struct ext4_attr {
2315 struct attribute attr;
2316 ssize_t (*show)(struct ext4_attr *, struct ext4_sb_info *, char *);
60e6679e 2317 ssize_t (*store)(struct ext4_attr *, struct ext4_sb_info *,
3197ebdb
TT		 2318 const char *, size_t);
2319 int offset;
2320};
2321
2322static int parse_strtoul(const char *buf,
2323 unsigned long max, unsigned long *value)
2324{
2325 char *endp;
2326
e7d2860b
AGR		 2327 *value = simple_strtoul(skip_spaces(buf), &endp, 0);
2328 endp = skip_spaces(endp);
3197ebdb
TT		 2329 if (*endp || *value > max)
2330 return -EINVAL;
2331
2332 return 0;
2333}
2334
2335static ssize_t delayed_allocation_blocks_show(struct ext4_attr *a,
2336 struct ext4_sb_info *sbi,
2337 char *buf)
2338{
2339 return snprintf(buf, PAGE_SIZE, "%llu\n",
7b415bf6
AK		 2340 (s64) EXT4_C2B(sbi,
2341 percpu_counter_sum(&sbi->s_dirtyclusters_counter)));
3197ebdb
TT		 2342}
2343
2344static ssize_t session_write_kbytes_show(struct ext4_attr *a,
2345 struct ext4_sb_info *sbi, char *buf)
2346{
2347 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2348
f613dfcb
TT		 2349 if (!sb->s_bdev->bd_part)
2350 return snprintf(buf, PAGE_SIZE, "0\n");
3197ebdb
TT		 2351 return snprintf(buf, PAGE_SIZE, "%lu\n",
2352 (part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
2353 sbi->s_sectors_written_start) >> 1);
2354}
2355
2356static ssize_t lifetime_write_kbytes_show(struct ext4_attr *a,
2357 struct ext4_sb_info *sbi, char *buf)
2358{
2359 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2360
f613dfcb
TT		 2361 if (!sb->s_bdev->bd_part)
2362 return snprintf(buf, PAGE_SIZE, "0\n");
3197ebdb 2363 return snprintf(buf, PAGE_SIZE, "%llu\n",
a6b43e38 2364 (unsigned long long)(sbi->s_kbytes_written +
3197ebdb 2365 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
a6b43e38 2366 EXT4_SB(sb)->s_sectors_written_start) >> 1)));
3197ebdb
TT		 2367}
2368
77f4135f
VH		 2369static ssize_t extent_cache_hits_show(struct ext4_attr *a,
2370 struct ext4_sb_info *sbi, char *buf)
2371{
2372 return snprintf(buf, PAGE_SIZE, "%lu\n", sbi->extent_cache_hits);
2373}
2374
2375static ssize_t extent_cache_misses_show(struct ext4_attr *a,
2376 struct ext4_sb_info *sbi, char *buf)
2377{
2378 return snprintf(buf, PAGE_SIZE, "%lu\n", sbi->extent_cache_misses);
2379}
2380
3197ebdb
TT		 2381static ssize_t inode_readahead_blks_store(struct ext4_attr *a,
2382 struct ext4_sb_info *sbi,
2383 const char *buf, size_t count)
2384{
2385 unsigned long t;
2386
2387 if (parse_strtoul(buf, 0x40000000, &t))
2388 return -EINVAL;
2389
5dbd571d 2390 if (t && !is_power_of_2(t))
3197ebdb
TT		 2391 return -EINVAL;
2392
2393 sbi->s_inode_readahead_blks = t;
2394 return count;
2395}
2396
2397static ssize_t sbi_ui_show(struct ext4_attr *a,
0b8e58a1 2398 struct ext4_sb_info *sbi, char *buf)
3197ebdb
TT		 2399{
2400 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
2401
2402 return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
2403}
2404
2405static ssize_t sbi_ui_store(struct ext4_attr *a,
2406 struct ext4_sb_info *sbi,
2407 const char *buf, size_t count)
2408{
2409 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
2410 unsigned long t;
2411
2412 if (parse_strtoul(buf, 0xffffffff, &t))
2413 return -EINVAL;
2414 *ui = t;
2415 return count;
2416}
2417
2418#define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \
2419static struct ext4_attr ext4_attr_##_name = { \
2420 .attr = {.name = __stringify(_name), .mode = _mode }, \
2421 .show = _show, \
2422 .store = _store, \
2423 .offset = offsetof(struct ext4_sb_info, _elname), \
2424}
2425#define EXT4_ATTR(name, mode, show, store) \
2426static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store)
2427
857ac889 2428#define EXT4_INFO_ATTR(name) EXT4_ATTR(name, 0444, NULL, NULL)
3197ebdb
TT		 2429#define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL)
2430#define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store)
2431#define EXT4_RW_ATTR_SBI_UI(name, elname) \
2432 EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname)
2433#define ATTR_LIST(name) &ext4_attr_##name.attr
2434
2435EXT4_RO_ATTR(delayed_allocation_blocks);
2436EXT4_RO_ATTR(session_write_kbytes);
2437EXT4_RO_ATTR(lifetime_write_kbytes);
77f4135f
VH		 2438EXT4_RO_ATTR(extent_cache_hits);
2439EXT4_RO_ATTR(extent_cache_misses);
3197ebdb
TT		 2440EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, sbi_ui_show,
2441 inode_readahead_blks_store, s_inode_readahead_blks);
11013911 2442EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal);
3197ebdb
TT		 2443EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats);
2444EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan);
2445EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan);
2446EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs);
2447EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request);
2448EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc);
55138e0b 2449EXT4_RW_ATTR_SBI_UI(max_writeback_mb_bump, s_max_writeback_mb_bump);
3197ebdb
TT		 2450
2451static struct attribute *ext4_attrs[] = {
2452 ATTR_LIST(delayed_allocation_blocks),
2453 ATTR_LIST(session_write_kbytes),
2454 ATTR_LIST(lifetime_write_kbytes),
77f4135f
VH		 2455 ATTR_LIST(extent_cache_hits),
2456 ATTR_LIST(extent_cache_misses),
3197ebdb 2457 ATTR_LIST(inode_readahead_blks),
11013911 2458 ATTR_LIST(inode_goal),
3197ebdb
TT		 2459 ATTR_LIST(mb_stats),
2460 ATTR_LIST(mb_max_to_scan),
2461 ATTR_LIST(mb_min_to_scan),
2462 ATTR_LIST(mb_order2_req),
2463 ATTR_LIST(mb_stream_req),
2464 ATTR_LIST(mb_group_prealloc),
55138e0b 2465 ATTR_LIST(max_writeback_mb_bump),
3197ebdb
TT		 2466 NULL,
2467};
2468
857ac889
LC		 2469/* Features this copy of ext4 supports */
2470EXT4_INFO_ATTR(lazy_itable_init);
27ee40df 2471EXT4_INFO_ATTR(batched_discard);
857ac889
LC		 2472
2473static struct attribute *ext4_feat_attrs[] = {
2474 ATTR_LIST(lazy_itable_init),
27ee40df 2475 ATTR_LIST(batched_discard),
857ac889
LC		 2476 NULL,
2477};
2478
3197ebdb
TT		 2479static ssize_t ext4_attr_show(struct kobject *kobj,
2480 struct attribute *attr, char *buf)
2481{
2482 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2483 s_kobj);
2484 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2485
2486 return a->show ? a->show(a, sbi, buf) : 0;
2487}
2488
2489static ssize_t ext4_attr_store(struct kobject *kobj,
2490 struct attribute *attr,
2491 const char *buf, size_t len)
2492{
2493 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2494 s_kobj);
2495 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2496
2497 return a->store ? a->store(a, sbi, buf, len) : 0;
2498}
2499
2500static void ext4_sb_release(struct kobject *kobj)
2501{
2502 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2503 s_kobj);
2504 complete(&sbi->s_kobj_unregister);
2505}
2506
52cf25d0 2507static const struct sysfs_ops ext4_attr_ops = {
3197ebdb
TT		 2508 .show = ext4_attr_show,
2509 .store = ext4_attr_store,
2510};
2511
2512static struct kobj_type ext4_ktype = {
2513 .default_attrs = ext4_attrs,
2514 .sysfs_ops = &ext4_attr_ops,
2515 .release = ext4_sb_release,
2516};
2517
857ac889
LC		 2518static void ext4_feat_release(struct kobject *kobj)
2519{
2520 complete(&ext4_feat->f_kobj_unregister);
2521}
2522
2523static struct kobj_type ext4_feat_ktype = {
2524 .default_attrs = ext4_feat_attrs,
2525 .sysfs_ops = &ext4_attr_ops,
2526 .release = ext4_feat_release,
2527};
2528
a13fb1a4
ES		 2529/*
2530 * Check whether this filesystem can be mounted based on
2531 * the features present and the RDONLY/RDWR mount requested.
2532 * Returns 1 if this filesystem can be mounted as requested,
2533 * 0 if it cannot be.
2534 */
2535static int ext4_feature_set_ok(struct super_block *sb, int readonly)
2536{
2537 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP)) {
2538 ext4_msg(sb, KERN_ERR,
2539 "Couldn't mount because of "
2540 "unsupported optional features (%x)",
2541 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
2542 ~EXT4_FEATURE_INCOMPAT_SUPP));
2543 return 0;
2544 }
2545
2546 if (readonly)
2547 return 1;
2548
2549 /* Check that feature set is OK for a read-write mount */
2550 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP)) {
2551 ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of "
2552 "unsupported optional features (%x)",
2553 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
2554 ~EXT4_FEATURE_RO_COMPAT_SUPP));
2555 return 0;
2556 }
2557 /*
2558 * Large file size enabled file system can only be mounted
2559 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
2560 */
2561 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) {
2562 if (sizeof(blkcnt_t) < sizeof(u64)) {
2563 ext4_msg(sb, KERN_ERR, "Filesystem with huge files "
2564 "cannot be mounted RDWR without "
2565 "CONFIG_LBDAF");
2566 return 0;
2567 }
2568 }
bab08ab9
TT		 2569 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_BIGALLOC) &&
2570 !EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS)) {
2571 ext4_msg(sb, KERN_ERR,
2572 "Can't support bigalloc feature without "
2573 "extents feature\n");
2574 return 0;
2575 }
a13fb1a4
ES		 2576 return 1;
2577}
2578
66e61a9e
TT		 2579/*
2580 * This function is called once a day if we have errors logged
2581 * on the file system
2582 */
2583static void print_daily_error_info(unsigned long arg)
2584{
2585 struct super_block *sb = (struct super_block *) arg;
2586 struct ext4_sb_info *sbi;
2587 struct ext4_super_block *es;
2588
2589 sbi = EXT4_SB(sb);
2590 es = sbi->s_es;
2591
2592 if (es->s_error_count)
2593 ext4_msg(sb, KERN_NOTICE, "error count: %u",
2594 le32_to_cpu(es->s_error_count));
2595 if (es->s_first_error_time) {
2596 printk(KERN_NOTICE "EXT4-fs (%s): initial error at %u: %.*s:%d",
2597 sb->s_id, le32_to_cpu(es->s_first_error_time),
2598 (int) sizeof(es->s_first_error_func),
2599 es->s_first_error_func,
2600 le32_to_cpu(es->s_first_error_line));
2601 if (es->s_first_error_ino)
2602 printk(": inode %u",
2603 le32_to_cpu(es->s_first_error_ino));
2604 if (es->s_first_error_block)
2605 printk(": block %llu", (unsigned long long)
2606 le64_to_cpu(es->s_first_error_block));
2607 printk("\n");
2608 }
2609 if (es->s_last_error_time) {
2610 printk(KERN_NOTICE "EXT4-fs (%s): last error at %u: %.*s:%d",
2611 sb->s_id, le32_to_cpu(es->s_last_error_time),
2612 (int) sizeof(es->s_last_error_func),
2613 es->s_last_error_func,
2614 le32_to_cpu(es->s_last_error_line));
2615 if (es->s_last_error_ino)
2616 printk(": inode %u",
2617 le32_to_cpu(es->s_last_error_ino));
2618 if (es->s_last_error_block)
2619 printk(": block %llu", (unsigned long long)
2620 le64_to_cpu(es->s_last_error_block));
2621 printk("\n");
2622 }
2623 mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ); /* Once a day */
2624}
2625
bfff6873
LC		 2626/* Find next suitable group and run ext4_init_inode_table */
2627static int ext4_run_li_request(struct ext4_li_request *elr)
2628{
2629 struct ext4_group_desc *gdp = NULL;
2630 ext4_group_t group, ngroups;
2631 struct super_block *sb;
2632 unsigned long timeout = 0;
2633 int ret = 0;
2634
2635 sb = elr->lr_super;
2636 ngroups = EXT4_SB(sb)->s_groups_count;
2637
2638 for (group = elr->lr_next_group; group < ngroups; group++) {
2639 gdp = ext4_get_group_desc(sb, group, NULL);
2640 if (!gdp) {
2641 ret = 1;
2642 break;
2643 }
2644
2645 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2646 break;
2647 }
2648
2649 if (group == ngroups)
2650 ret = 1;
2651
2652 if (!ret) {
2653 timeout = jiffies;
2654 ret = ext4_init_inode_table(sb, group,
2655 elr->lr_timeout ? 0 : 1);
2656 if (elr->lr_timeout == 0) {
51ce6511
LC		 2657 timeout = (jiffies - timeout) *
2658 elr->lr_sbi->s_li_wait_mult;
bfff6873
LC		 2659 elr->lr_timeout = timeout;
2660 }
2661 elr->lr_next_sched = jiffies + elr->lr_timeout;
2662 elr->lr_next_group = group + 1;
2663 }
2664
2665 return ret;
2666}
2667
2668/*
2669 * Remove lr_request from the list_request and free the
4ed5c033 2670 * request structure. Should be called with li_list_mtx held
bfff6873
LC		 2671 */
2672static void ext4_remove_li_request(struct ext4_li_request *elr)
2673{
2674 struct ext4_sb_info *sbi;
2675
2676 if (!elr)
2677 return;
2678
2679 sbi = elr->lr_sbi;
2680
2681 list_del(&elr->lr_request);
2682 sbi->s_li_request = NULL;
2683 kfree(elr);
2684}
2685
2686static void ext4_unregister_li_request(struct super_block *sb)
2687{
1bb933fb
LC		 2688 mutex_lock(&ext4_li_mtx);
2689 if (!ext4_li_info) {
2690 mutex_unlock(&ext4_li_mtx);
bfff6873 2691 return;
1bb933fb 2692 }
bfff6873
LC		 2693
2694 mutex_lock(&ext4_li_info->li_list_mtx);
1bb933fb 2695 ext4_remove_li_request(EXT4_SB(sb)->s_li_request);
bfff6873 2696 mutex_unlock(&ext4_li_info->li_list_mtx);
1bb933fb 2697 mutex_unlock(&ext4_li_mtx);
bfff6873
LC		 2698}
2699
8f1f7453
ES		 2700static struct task_struct *ext4_lazyinit_task;
2701
bfff6873
LC		 2702/*
2703 * This is the function where ext4lazyinit thread lives. It walks
2704 * through the request list searching for next scheduled filesystem.
2705 * When such a fs is found, run the lazy initialization request
2706 * (ext4_rn_li_request) and keep track of the time spend in this
2707 * function. Based on that time we compute next schedule time of
2708 * the request. When walking through the list is complete, compute
2709 * next waking time and put itself into sleep.
2710 */
2711static int ext4_lazyinit_thread(void *arg)
2712{
2713 struct ext4_lazy_init *eli = (struct ext4_lazy_init *)arg;
2714 struct list_head *pos, *n;
2715 struct ext4_li_request *elr;
4ed5c033 2716 unsigned long next_wakeup, cur;
bfff6873
LC		 2717
2718 BUG_ON(NULL == eli);
2719
bfff6873
LC		 2720cont_thread:
2721 while (true) {
2722 next_wakeup = MAX_JIFFY_OFFSET;
2723
2724 mutex_lock(&eli->li_list_mtx);
2725 if (list_empty(&eli->li_request_list)) {
2726 mutex_unlock(&eli->li_list_mtx);
2727 goto exit_thread;
2728 }
2729
2730 list_for_each_safe(pos, n, &eli->li_request_list) {
2731 elr = list_entry(pos, struct ext4_li_request,
2732 lr_request);
2733
b2c78cd0
TT		 2734 if (time_after_eq(jiffies, elr->lr_next_sched)) {
2735 if (ext4_run_li_request(elr) != 0) {
2736 /* error, remove the lazy_init job */
2737 ext4_remove_li_request(elr);
2738 continue;
2739 }
bfff6873
LC		 2740 }
2741
2742 if (time_before(elr->lr_next_sched, next_wakeup))
2743 next_wakeup = elr->lr_next_sched;
2744 }
2745 mutex_unlock(&eli->li_list_mtx);
2746
a0acae0e 2747 try_to_freeze();
bfff6873 2748
4ed5c033
LC		 2749 cur = jiffies;
2750 if ((time_after_eq(cur, next_wakeup)) ||
f4245bd4 2751 (MAX_JIFFY_OFFSET == next_wakeup)) {
bfff6873
LC		 2752 cond_resched();
2753 continue;
2754 }
2755
4ed5c033
LC		 2756 schedule_timeout_interruptible(next_wakeup - cur);
2757
8f1f7453
ES		 2758 if (kthread_should_stop()) {
2759 ext4_clear_request_list();
2760 goto exit_thread;
2761 }
bfff6873
LC		 2762 }
2763
2764exit_thread:
2765 /*
2766 * It looks like the request list is empty, but we need
2767 * to check it under the li_list_mtx lock, to prevent any
2768 * additions into it, and of course we should lock ext4_li_mtx
2769 * to atomically free the list and ext4_li_info, because at
2770 * this point another ext4 filesystem could be registering
2771 * new one.
2772 */
2773 mutex_lock(&ext4_li_mtx);
2774 mutex_lock(&eli->li_list_mtx);
2775 if (!list_empty(&eli->li_request_list)) {
2776 mutex_unlock(&eli->li_list_mtx);
2777 mutex_unlock(&ext4_li_mtx);
2778 goto cont_thread;
2779 }
2780 mutex_unlock(&eli->li_list_mtx);
bfff6873
LC		 2781 kfree(ext4_li_info);
2782 ext4_li_info = NULL;
2783 mutex_unlock(&ext4_li_mtx);
2784
2785 return 0;
2786}
2787
2788static void ext4_clear_request_list(void)
2789{
2790 struct list_head *pos, *n;
2791 struct ext4_li_request *elr;
2792
2793 mutex_lock(&ext4_li_info->li_list_mtx);
bfff6873
LC		 2794 list_for_each_safe(pos, n, &ext4_li_info->li_request_list) {
2795 elr = list_entry(pos, struct ext4_li_request,
2796 lr_request);
2797 ext4_remove_li_request(elr);
2798 }
2799 mutex_unlock(&ext4_li_info->li_list_mtx);
2800}
2801
2802static int ext4_run_lazyinit_thread(void)
2803{
8f1f7453
ES		 2804 ext4_lazyinit_task = kthread_run(ext4_lazyinit_thread,
2805 ext4_li_info, "ext4lazyinit");
2806 if (IS_ERR(ext4_lazyinit_task)) {
2807 int err = PTR_ERR(ext4_lazyinit_task);
bfff6873 2808 ext4_clear_request_list();
bfff6873
LC		 2809 kfree(ext4_li_info);
2810 ext4_li_info = NULL;
2811 printk(KERN_CRIT "EXT4: error %d creating inode table "
2812 "initialization thread\n",
2813 err);
2814 return err;
2815 }
2816 ext4_li_info->li_state |= EXT4_LAZYINIT_RUNNING;
bfff6873
LC		 2817 return 0;
2818}
2819
2820/*
2821 * Check whether it make sense to run itable init. thread or not.
2822 * If there is at least one uninitialized inode table, return
2823 * corresponding group number, else the loop goes through all
2824 * groups and return total number of groups.
2825 */
2826static ext4_group_t ext4_has_uninit_itable(struct super_block *sb)
2827{
2828 ext4_group_t group, ngroups = EXT4_SB(sb)->s_groups_count;
2829 struct ext4_group_desc *gdp = NULL;
2830
2831 for (group = 0; group < ngroups; group++) {
2832 gdp = ext4_get_group_desc(sb, group, NULL);
2833 if (!gdp)
2834 continue;
2835
2836 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2837 break;
2838 }
2839
2840 return group;
2841}
2842
2843static int ext4_li_info_new(void)
2844{
2845 struct ext4_lazy_init *eli = NULL;
2846
2847 eli = kzalloc(sizeof(*eli), GFP_KERNEL);
2848 if (!eli)
2849 return -ENOMEM;
2850
bfff6873
LC		 2851 INIT_LIST_HEAD(&eli->li_request_list);
2852 mutex_init(&eli->li_list_mtx);
2853
bfff6873
LC		 2854 eli->li_state |= EXT4_LAZYINIT_QUIT;
2855
2856 ext4_li_info = eli;
2857
2858 return 0;
2859}
2860
2861static struct ext4_li_request *ext4_li_request_new(struct super_block *sb,
2862 ext4_group_t start)
2863{
2864 struct ext4_sb_info *sbi = EXT4_SB(sb);
2865 struct ext4_li_request *elr;
2866 unsigned long rnd;
2867
2868 elr = kzalloc(sizeof(*elr), GFP_KERNEL);
2869 if (!elr)
2870 return NULL;
2871
2872 elr->lr_super = sb;
2873 elr->lr_sbi = sbi;
2874 elr->lr_next_group = start;
2875
2876 /*
2877 * Randomize first schedule time of the request to
2878 * spread the inode table initialization requests
2879 * better.
2880 */
2881 get_random_bytes(&rnd, sizeof(rnd));
2882 elr->lr_next_sched = jiffies + (unsigned long)rnd %
2883 (EXT4_DEF_LI_MAX_START_DELAY * HZ);
2884
2885 return elr;
2886}
2887
2888static int ext4_register_li_request(struct super_block *sb,
2889 ext4_group_t first_not_zeroed)
2890{
2891 struct ext4_sb_info *sbi = EXT4_SB(sb);
2892 struct ext4_li_request *elr;
2893 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
6c5a6cb9 2894 int ret = 0;
bfff6873 2895
51ce6511
LC		 2896 if (sbi->s_li_request != NULL) {
2897 /*
2898 * Reset timeout so it can be computed again, because
2899 * s_li_wait_mult might have changed.
2900 */
2901 sbi->s_li_request->lr_timeout = 0;
beed5ecb 2902 return 0;
51ce6511 2903 }
bfff6873
LC		 2904
2905 if (first_not_zeroed == ngroups ||
2906 (sb->s_flags & MS_RDONLY) ||
55ff3840 2907 !test_opt(sb, INIT_INODE_TABLE))
beed5ecb 2908 return 0;
bfff6873
LC		 2909
2910 elr = ext4_li_request_new(sb, first_not_zeroed);
beed5ecb
NK		 2911 if (!elr)
2912 return -ENOMEM;
bfff6873
LC		 2913
2914 mutex_lock(&ext4_li_mtx);
2915
2916 if (NULL == ext4_li_info) {
2917 ret = ext4_li_info_new();
2918 if (ret)
2919 goto out;
2920 }
2921
2922 mutex_lock(&ext4_li_info->li_list_mtx);
2923 list_add(&elr->lr_request, &ext4_li_info->li_request_list);
2924 mutex_unlock(&ext4_li_info->li_list_mtx);
2925
2926 sbi->s_li_request = elr;
46e4690b
TM		 2927 /*
2928 * set elr to NULL here since it has been inserted to
2929 * the request_list and the removal and free of it is
2930 * handled by ext4_clear_request_list from now on.
2931 */
2932 elr = NULL;
bfff6873
LC		 2933
2934 if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) {
2935 ret = ext4_run_lazyinit_thread();
2936 if (ret)
2937 goto out;
2938 }
bfff6873 2939out:
beed5ecb
NK		 2940 mutex_unlock(&ext4_li_mtx);
2941 if (ret)
bfff6873 2942 kfree(elr);
bfff6873
LC		 2943 return ret;
2944}
2945
2946/*
2947 * We do not need to lock anything since this is called on
2948 * module unload.
2949 */
2950static void ext4_destroy_lazyinit_thread(void)
2951{
2952 /*
2953 * If thread exited earlier
2954 * there's nothing to be done.
2955 */
8f1f7453 2956 if (!ext4_li_info || !ext4_lazyinit_task)
bfff6873
LC		 2957 return;
2958
8f1f7453 2959 kthread_stop(ext4_lazyinit_task);
bfff6873
LC		 2960}
2961
2b2d6d01 2962static int ext4_fill_super(struct super_block *sb, void *data, int silent)
ac27a0ec 2963{
d4c402d9 2964 char *orig_data = kstrdup(data, GFP_KERNEL);
2b2d6d01 2965 struct buffer_head *bh;
617ba13b
MC		 2966 struct ext4_super_block *es = NULL;
2967 struct ext4_sb_info *sbi;
2968 ext4_fsblk_t block;
2969 ext4_fsblk_t sb_block = get_sb_block(&data);
70bbb3e0 2970 ext4_fsblk_t logical_sb_block;
ac27a0ec 2971 unsigned long offset = 0;
ac27a0ec
DK		 2972 unsigned long journal_devnum = 0;
2973 unsigned long def_mount_opts;
2974 struct inode *root;
9f6200bb 2975 char *cp;
0390131b 2976 const char *descr;
dcc7dae3 2977 int ret = -ENOMEM;
281b5995 2978 int blocksize, clustersize;
4ec11028
TT		 2979 unsigned int db_count;
2980 unsigned int i;
281b5995 2981 int needs_recovery, has_huge_files, has_bigalloc;
bd81d8ee 2982 __u64 blocks_count;
833f4077 2983 int err;
b3881f74 2984 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
bfff6873 2985 ext4_group_t first_not_zeroed;
ac27a0ec
DK		 2986
2987 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
2988 if (!sbi)
dcc7dae3 2989 goto out_free_orig;
705895b6
PE		 2990
2991 sbi->s_blockgroup_lock =
2992 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
2993 if (!sbi->s_blockgroup_lock) {
2994 kfree(sbi);
dcc7dae3 2995 goto out_free_orig;
705895b6 2996 }
ac27a0ec
DK		 2997 sb->s_fs_info = sbi;
2998 sbi->s_mount_opt = 0;
617ba13b
MC		 2999 sbi->s_resuid = EXT4_DEF_RESUID;
3000 sbi->s_resgid = EXT4_DEF_RESGID;
240799cd 3001 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
d9c9bef1 3002 sbi->s_sb_block = sb_block;
f613dfcb
TT		 3003 if (sb->s_bdev->bd_part)
3004 sbi->s_sectors_written_start =
3005 part_stat_read(sb->s_bdev->bd_part, sectors[1]);
ac27a0ec 3006
9f6200bb
TT		 3007 /* Cleanup superblock name */
3008 for (cp = sb->s_id; (cp = strchr(cp, '/'));)
3009 *cp = '!';
3010
dcc7dae3 3011 ret = -EINVAL;
617ba13b 3012 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
ac27a0ec 3013 if (!blocksize) {
b31e1552 3014 ext4_msg(sb, KERN_ERR, "unable to set blocksize");
ac27a0ec
DK		 3015 goto out_fail;
3016 }
3017
3018 /*
617ba13b 3019 * The ext4 superblock will not be buffer aligned for other than 1kB
ac27a0ec
DK		 3020 * block sizes. We need to calculate the offset from buffer start.
3021 */
617ba13b 3022 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
70bbb3e0
AM		 3023 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3024 offset = do_div(logical_sb_block, blocksize);
ac27a0ec 3025 } else {
70bbb3e0 3026 logical_sb_block = sb_block;
ac27a0ec
DK		 3027 }
3028
70bbb3e0 3029 if (!(bh = sb_bread(sb, logical_sb_block))) {
b31e1552 3030 ext4_msg(sb, KERN_ERR, "unable to read superblock");
ac27a0ec
DK		 3031 goto out_fail;
3032 }
3033 /*
3034 * Note: s_es must be initialized as soon as possible because
617ba13b 3035 * some ext4 macro-instructions depend on its value
ac27a0ec 3036 */
617ba13b 3037 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
ac27a0ec
DK		 3038 sbi->s_es = es;
3039 sb->s_magic = le16_to_cpu(es->s_magic);
617ba13b
MC		 3040 if (sb->s_magic != EXT4_SUPER_MAGIC)
3041 goto cantfind_ext4;
afc32f7e 3042 sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
ac27a0ec
DK		 3043
3044 /* Set defaults before we parse the mount options */
3045 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
fd8c37ec 3046 set_opt(sb, INIT_INODE_TABLE);
617ba13b 3047 if (def_mount_opts & EXT4_DEFM_DEBUG)
fd8c37ec 3048 set_opt(sb, DEBUG);
87f26807 3049 if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
fd8c37ec 3050 set_opt(sb, GRPID);
617ba13b 3051 if (def_mount_opts & EXT4_DEFM_UID16)
fd8c37ec 3052 set_opt(sb, NO_UID32);
ea663336 3053 /* xattr user namespace & acls are now defaulted on */
03010a33 3054#ifdef CONFIG_EXT4_FS_XATTR
ea663336 3055 set_opt(sb, XATTR_USER);
2e7842b8 3056#endif
03010a33 3057#ifdef CONFIG_EXT4_FS_POSIX_ACL
ea663336 3058 set_opt(sb, POSIX_ACL);
2e7842b8 3059#endif
6fd7a467 3060 set_opt(sb, MBLK_IO_SUBMIT);
617ba13b 3061 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
fd8c37ec 3062 set_opt(sb, JOURNAL_DATA);
617ba13b 3063 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
fd8c37ec 3064 set_opt(sb, ORDERED_DATA);
617ba13b 3065 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
fd8c37ec 3066 set_opt(sb, WRITEBACK_DATA);
617ba13b
MC		 3067
3068 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
fd8c37ec 3069 set_opt(sb, ERRORS_PANIC);
bb4f397a 3070 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
fd8c37ec 3071 set_opt(sb, ERRORS_CONT);
bb4f397a 3072 else
fd8c37ec 3073 set_opt(sb, ERRORS_RO);
8b67f04a 3074 if (def_mount_opts & EXT4_DEFM_BLOCK_VALIDITY)
fd8c37ec 3075 set_opt(sb, BLOCK_VALIDITY);
8b67f04a 3076 if (def_mount_opts & EXT4_DEFM_DISCARD)
fd8c37ec 3077 set_opt(sb, DISCARD);
ac27a0ec
DK		 3078
3079 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
3080 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
30773840
TT		 3081 sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
3082 sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
3083 sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
ac27a0ec 3084
8b67f04a 3085 if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0)
fd8c37ec 3086 set_opt(sb, BARRIER);
ac27a0ec 3087
dd919b98
AK		 3088 /*
3089 * enable delayed allocation by default
3090 * Use -o nodelalloc to turn it off
3091 */
8b67f04a
TT		 3092 if (!IS_EXT3_SB(sb) &&
3093 ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0))
fd8c37ec 3094 set_opt(sb, DELALLOC);
dd919b98 3095
51ce6511
LC		 3096 /*
3097 * set default s_li_wait_mult for lazyinit, for the case there is
3098 * no mount option specified.
3099 */
3100 sbi->s_li_wait_mult = EXT4_DEF_LI_WAIT_MULT;
3101
8b67f04a 3102 if (!parse_options((char *) sbi->s_es->s_mount_opts, sb,
661aa520 3103 &journal_devnum, &journal_ioprio, 0)) {
8b67f04a
TT		 3104 ext4_msg(sb, KERN_WARNING,
3105 "failed to parse options in superblock: %s",
3106 sbi->s_es->s_mount_opts);
3107 }
b3881f74 3108 if (!parse_options((char *) data, sb, &journal_devnum,
661aa520 3109 &journal_ioprio, 0))
ac27a0ec
DK		 3110 goto failed_mount;
3111
56889787
TT		 3112 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
3113 printk_once(KERN_WARNING "EXT4-fs: Warning: mounting "
3114 "with data=journal disables delayed "
3115 "allocation and O_DIRECT support!\n");
3116 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
3117 ext4_msg(sb, KERN_ERR, "can't mount with "
3118 "both data=journal and delalloc");
3119 goto failed_mount;
3120 }
3121 if (test_opt(sb, DIOREAD_NOLOCK)) {
3122 ext4_msg(sb, KERN_ERR, "can't mount with "
3123 "both data=journal and delalloc");
3124 goto failed_mount;
3125 }
3126 if (test_opt(sb, DELALLOC))
3127 clear_opt(sb, DELALLOC);
3128 }
3129
3130 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
3131 if (test_opt(sb, DIOREAD_NOLOCK)) {
3132 if (blocksize < PAGE_SIZE) {
3133 ext4_msg(sb, KERN_ERR, "can't mount with "
3134 "dioread_nolock if block size != PAGE_SIZE");
3135 goto failed_mount;
3136 }
3137 }
3138
ac27a0ec 3139 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
482a7425 3140 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec 3141
617ba13b
MC		 3142 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
3143 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
3144 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
3145 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
b31e1552
ES		 3146 ext4_msg(sb, KERN_WARNING,
3147 "feature flags set on rev 0 fs, "
3148 "running e2fsck is recommended");
469108ff 3149
2035e776
TT		 3150 if (IS_EXT2_SB(sb)) {
3151 if (ext2_feature_set_ok(sb))
3152 ext4_msg(sb, KERN_INFO, "mounting ext2 file system "
3153 "using the ext4 subsystem");
3154 else {
3155 ext4_msg(sb, KERN_ERR, "couldn't mount as ext2 due "
3156 "to feature incompatibilities");
3157 goto failed_mount;
3158 }
3159 }
3160
3161 if (IS_EXT3_SB(sb)) {
3162 if (ext3_feature_set_ok(sb))
3163 ext4_msg(sb, KERN_INFO, "mounting ext3 file system "
3164 "using the ext4 subsystem");
3165 else {
3166 ext4_msg(sb, KERN_ERR, "couldn't mount as ext3 due "
3167 "to feature incompatibilities");
3168 goto failed_mount;
3169 }
3170 }
3171
ac27a0ec
DK		 3172 /*
3173 * Check feature flags regardless of the revision level, since we
3174 * previously didn't change the revision level when setting the flags,
3175 * so there is a chance incompat flags are set on a rev 0 filesystem.
3176 */
a13fb1a4 3177 if (!ext4_feature_set_ok(sb, (sb->s_flags & MS_RDONLY)))
ac27a0ec 3178 goto failed_mount;
a13fb1a4 3179
617ba13b
MC		 3180 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
3181 blocksize > EXT4_MAX_BLOCK_SIZE) {
b31e1552
ES		 3182 ext4_msg(sb, KERN_ERR,
3183 "Unsupported filesystem blocksize %d", blocksize);
ac27a0ec
DK		 3184 goto failed_mount;
3185 }
3186
ac27a0ec 3187 if (sb->s_blocksize != blocksize) {
ce40733c
AK		 3188 /* Validate the filesystem blocksize */
3189 if (!sb_set_blocksize(sb, blocksize)) {
b31e1552 3190 ext4_msg(sb, KERN_ERR, "bad block size %d",
ce40733c 3191 blocksize);
ac27a0ec
DK		 3192 goto failed_mount;
3193 }
3194
2b2d6d01 3195 brelse(bh);
70bbb3e0
AM		 3196 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3197 offset = do_div(logical_sb_block, blocksize);
3198 bh = sb_bread(sb, logical_sb_block);
ac27a0ec 3199 if (!bh) {
b31e1552
ES		 3200 ext4_msg(sb, KERN_ERR,
3201 "Can't read superblock on 2nd try");
ac27a0ec
DK		 3202 goto failed_mount;
3203 }
617ba13b 3204 es = (struct ext4_super_block *)(((char *)bh->b_data) + offset);
ac27a0ec 3205 sbi->s_es = es;
617ba13b 3206 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
b31e1552
ES		 3207 ext4_msg(sb, KERN_ERR,
3208 "Magic mismatch, very weird!");
ac27a0ec
DK		 3209 goto failed_mount;
3210 }
3211 }
3212
a13fb1a4
ES		 3213 has_huge_files = EXT4_HAS_RO_COMPAT_FEATURE(sb,
3214 EXT4_FEATURE_RO_COMPAT_HUGE_FILE);
f287a1a5
TT		 3215 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
3216 has_huge_files);
3217 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
ac27a0ec 3218
617ba13b
MC		 3219 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
3220 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
3221 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
ac27a0ec
DK		 3222 } else {
3223 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
3224 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
617ba13b 3225 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
1330593e 3226 (!is_power_of_2(sbi->s_inode_size)) ||
ac27a0ec 3227 (sbi->s_inode_size > blocksize)) {
b31e1552
ES		 3228 ext4_msg(sb, KERN_ERR,
3229 "unsupported inode size: %d",
2b2d6d01 3230 sbi->s_inode_size);
ac27a0ec
DK		 3231 goto failed_mount;
3232 }
ef7f3835
KS		 3233 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
3234 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
ac27a0ec 3235 }
0b8e58a1 3236
0d1ee42f
AR		 3237 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
3238 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
8fadc143 3239 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
0d1ee42f 3240 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
d8ea6cf8 3241 !is_power_of_2(sbi->s_desc_size)) {
b31e1552
ES		 3242 ext4_msg(sb, KERN_ERR,
3243 "unsupported descriptor size %lu",
0d1ee42f
AR		 3244 sbi->s_desc_size);
3245 goto failed_mount;
3246 }
3247 } else
3248 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
0b8e58a1 3249
ac27a0ec 3250 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
ac27a0ec 3251 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
b47b6f38 3252 if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
617ba13b 3253 goto cantfind_ext4;
0b8e58a1 3254
617ba13b 3255 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
ac27a0ec 3256 if (sbi->s_inodes_per_block == 0)
617ba13b 3257 goto cantfind_ext4;
ac27a0ec
DK		 3258 sbi->s_itb_per_group = sbi->s_inodes_per_group /
3259 sbi->s_inodes_per_block;
0d1ee42f 3260 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
ac27a0ec
DK		 3261 sbi->s_sbh = bh;
3262 sbi->s_mount_state = le16_to_cpu(es->s_state);
e57aa839
FW		 3263 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
3264 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
0b8e58a1 3265
2b2d6d01 3266 for (i = 0; i < 4; i++)
ac27a0ec
DK		 3267 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
3268 sbi->s_def_hash_version = es->s_def_hash_version;
f99b2589
TT		 3269 i = le32_to_cpu(es->s_flags);
3270 if (i & EXT2_FLAGS_UNSIGNED_HASH)
3271 sbi->s_hash_unsigned = 3;
3272 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
3273#ifdef __CHAR_UNSIGNED__
3274 es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
3275 sbi->s_hash_unsigned = 3;
3276#else
3277 es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
3278#endif
3279 sb->s_dirt = 1;
3280 }
ac27a0ec 3281
281b5995
TT		 3282 /* Handle clustersize */
3283 clustersize = BLOCK_SIZE << le32_to_cpu(es->s_log_cluster_size);
3284 has_bigalloc = EXT4_HAS_RO_COMPAT_FEATURE(sb,
3285 EXT4_FEATURE_RO_COMPAT_BIGALLOC);
3286 if (has_bigalloc) {
3287 if (clustersize < blocksize) {
3288 ext4_msg(sb, KERN_ERR,
3289 "cluster size (%d) smaller than "
3290 "block size (%d)", clustersize, blocksize);
3291 goto failed_mount;
3292 }
3293 sbi->s_cluster_bits = le32_to_cpu(es->s_log_cluster_size) -
3294 le32_to_cpu(es->s_log_block_size);
3295 sbi->s_clusters_per_group =
3296 le32_to_cpu(es->s_clusters_per_group);
3297 if (sbi->s_clusters_per_group > blocksize * 8) {
3298 ext4_msg(sb, KERN_ERR,
3299 "#clusters per group too big: %lu",
3300 sbi->s_clusters_per_group);
3301 goto failed_mount;
3302 }
3303 if (sbi->s_blocks_per_group !=
3304 (sbi->s_clusters_per_group * (clustersize / blocksize))) {
3305 ext4_msg(sb, KERN_ERR, "blocks per group (%lu) and "
3306 "clusters per group (%lu) inconsistent",
3307 sbi->s_blocks_per_group,
3308 sbi->s_clusters_per_group);
3309 goto failed_mount;
3310 }
3311 } else {
3312 if (clustersize != blocksize) {
3313 ext4_warning(sb, "fragment/cluster size (%d) != "
3314 "block size (%d)", clustersize,
3315 blocksize);
3316 clustersize = blocksize;
3317 }
3318 if (sbi->s_blocks_per_group > blocksize * 8) {
3319 ext4_msg(sb, KERN_ERR,
3320 "#blocks per group too big: %lu",
3321 sbi->s_blocks_per_group);
3322 goto failed_mount;
3323 }
3324 sbi->s_clusters_per_group = sbi->s_blocks_per_group;
3325 sbi->s_cluster_bits = 0;
ac27a0ec 3326 }
281b5995
TT		 3327 sbi->s_cluster_ratio = clustersize / blocksize;
3328
ac27a0ec 3329 if (sbi->s_inodes_per_group > blocksize * 8) {
b31e1552
ES		 3330 ext4_msg(sb, KERN_ERR,
3331 "#inodes per group too big: %lu",
2b2d6d01 3332 sbi->s_inodes_per_group);
ac27a0ec
DK		 3333 goto failed_mount;
3334 }
3335
bf43d84b
ES		 3336 /*
3337 * Test whether we have more sectors than will fit in sector_t,
3338 * and whether the max offset is addressable by the page cache.
3339 */
5a9ae68a 3340 err = generic_check_addressable(sb->s_blocksize_bits,
30ca22c7 3341 ext4_blocks_count(es));
5a9ae68a 3342 if (err) {
b31e1552 3343 ext4_msg(sb, KERN_ERR, "filesystem"
bf43d84b 3344 " too large to mount safely on this system");
ac27a0ec 3345 if (sizeof(sector_t) < 8)
90c699a9 3346 ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled");
5a9ae68a 3347 ret = err;
ac27a0ec
DK		 3348 goto failed_mount;
3349 }
3350
617ba13b
MC		 3351 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
3352 goto cantfind_ext4;
e7c95593 3353
0f2ddca6
FTN		 3354 /* check blocks count against device size */
3355 blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
3356 if (blocks_count && ext4_blocks_count(es) > blocks_count) {
b31e1552
ES		 3357 ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
3358 "exceeds size of device (%llu blocks)",
0f2ddca6
FTN		 3359 ext4_blocks_count(es), blocks_count);
3360 goto failed_mount;
3361 }
3362
0b8e58a1
AD		 3363 /*
3364 * It makes no sense for the first data block to be beyond the end
3365 * of the filesystem.
3366 */
3367 if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
5635a62b 3368 ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
b31e1552
ES		 3369 "block %u is beyond end of filesystem (%llu)",
3370 le32_to_cpu(es->s_first_data_block),
3371 ext4_blocks_count(es));
e7c95593
ES		 3372 goto failed_mount;
3373 }
bd81d8ee
LV		 3374 blocks_count = (ext4_blocks_count(es) -
3375 le32_to_cpu(es->s_first_data_block) +
3376 EXT4_BLOCKS_PER_GROUP(sb) - 1);
3377 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
4ec11028 3378 if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
b31e1552 3379 ext4_msg(sb, KERN_WARNING, "groups count too large: %u "
4ec11028 3380 "(block count %llu, first data block %u, "
b31e1552 3381 "blocks per group %lu)", sbi->s_groups_count,
4ec11028
TT		 3382 ext4_blocks_count(es),
3383 le32_to_cpu(es->s_first_data_block),
3384 EXT4_BLOCKS_PER_GROUP(sb));
3385 goto failed_mount;
3386 }
bd81d8ee 3387 sbi->s_groups_count = blocks_count;
fb0a387d
ES		 3388 sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
3389 (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
617ba13b
MC		 3390 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
3391 EXT4_DESC_PER_BLOCK(sb);
f18a5f21
TT		 3392 sbi->s_group_desc = ext4_kvmalloc(db_count *
3393 sizeof(struct buffer_head *),
3394 GFP_KERNEL);
ac27a0ec 3395 if (sbi->s_group_desc == NULL) {
b31e1552 3396 ext4_msg(sb, KERN_ERR, "not enough memory");
ac27a0ec
DK		 3397 goto failed_mount;
3398 }
3399
9f6200bb
TT		 3400 if (ext4_proc_root)
3401 sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);
240799cd 3402
705895b6 3403 bgl_lock_init(sbi->s_blockgroup_lock);
ac27a0ec
DK		 3404
3405 for (i = 0; i < db_count; i++) {
70bbb3e0 3406 block = descriptor_loc(sb, logical_sb_block, i);
ac27a0ec
DK		 3407 sbi->s_group_desc[i] = sb_bread(sb, block);
3408 if (!sbi->s_group_desc[i]) {
b31e1552
ES		 3409 ext4_msg(sb, KERN_ERR,
3410 "can't read group descriptor %d", i);
ac27a0ec
DK		 3411 db_count = i;
3412 goto failed_mount2;
3413 }
3414 }
bfff6873 3415 if (!ext4_check_descriptors(sb, &first_not_zeroed)) {
b31e1552 3416 ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
ac27a0ec
DK		 3417 goto failed_mount2;
3418 }
772cb7c8
JS		 3419 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
3420 if (!ext4_fill_flex_info(sb)) {
b31e1552
ES		 3421 ext4_msg(sb, KERN_ERR,
3422 "unable to initialize "
3423 "flex_bg meta info!");
772cb7c8
JS		 3424 goto failed_mount2;
3425 }
3426
ac27a0ec
DK		 3427 sbi->s_gdb_count = db_count;
3428 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
3429 spin_lock_init(&sbi->s_next_gen_lock);
3430
04496411
TM		 3431 init_timer(&sbi->s_err_report);
3432 sbi->s_err_report.function = print_daily_error_info;
3433 sbi->s_err_report.data = (unsigned long) sb;
3434
57042651 3435 err = percpu_counter_init(&sbi->s_freeclusters_counter,
5dee5437 3436 ext4_count_free_clusters(sb));
ce7e010a
TT		 3437 if (!err) {
3438 err = percpu_counter_init(&sbi->s_freeinodes_counter,
3439 ext4_count_free_inodes(sb));
3440 }
3441 if (!err) {
3442 err = percpu_counter_init(&sbi->s_dirs_counter,
3443 ext4_count_dirs(sb));
3444 }
3445 if (!err) {
57042651 3446 err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0);
ce7e010a
TT		 3447 }
3448 if (err) {
3449 ext4_msg(sb, KERN_ERR, "insufficient memory");
3450 goto failed_mount3;
3451 }
3452
c9de560d 3453 sbi->s_stripe = ext4_get_stripe_size(sbi);
55138e0b 3454 sbi->s_max_writeback_mb_bump = 128;
c9de560d 3455
ac27a0ec
DK		 3456 /*
3457 * set up enough so that it can read an inode
3458 */
9ca92389
TT		 3459 if (!test_opt(sb, NOLOAD) &&
3460 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
3461 sb->s_op = &ext4_sops;
3462 else
3463 sb->s_op = &ext4_nojournal_sops;
617ba13b
MC		 3464 sb->s_export_op = &ext4_export_ops;
3465 sb->s_xattr = ext4_xattr_handlers;
ac27a0ec 3466#ifdef CONFIG_QUOTA
617ba13b
MC		 3467 sb->s_qcop = &ext4_qctl_operations;
3468 sb->dq_op = &ext4_quota_operations;
ac27a0ec 3469#endif
f2fa2ffc
AK		 3470 memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
3471
ac27a0ec 3472 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
3b9d4ed2 3473 mutex_init(&sbi->s_orphan_lock);
8f82f840 3474 sbi->s_resize_flags = 0;
ac27a0ec
DK		 3475
3476 sb->s_root = NULL;
3477
3478 needs_recovery = (es->s_last_orphan != 0 ||
617ba13b
MC		 3479 EXT4_HAS_INCOMPAT_FEATURE(sb,
3480 EXT4_FEATURE_INCOMPAT_RECOVER));
ac27a0ec 3481
c5e06d10
JL		 3482 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_MMP) &&
3483 !(sb->s_flags & MS_RDONLY))
3484 if (ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block)))
3485 goto failed_mount3;
3486
ac27a0ec
DK		 3487 /*
3488 * The first inode we look at is the journal inode. Don't try
3489 * root first: it may be modified in the journal!
3490 */
3491 if (!test_opt(sb, NOLOAD) &&
617ba13b
MC		 3492 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
3493 if (ext4_load_journal(sb, es, journal_devnum))
ac27a0ec 3494 goto failed_mount3;
0390131b
FM		 3495 } else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) &&
3496 EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
b31e1552
ES		 3497 ext4_msg(sb, KERN_ERR, "required journal recovery "
3498 "suppressed and not mounted read-only");
744692dc 3499 goto failed_mount_wq;
ac27a0ec 3500 } else {
fd8c37ec 3501 clear_opt(sb, DATA_FLAGS);
0390131b
FM		 3502 sbi->s_journal = NULL;
3503 needs_recovery = 0;
3504 goto no_journal;
ac27a0ec
DK		 3505 }
3506
eb40a09c
JS		 3507 if (ext4_blocks_count(es) > 0xffffffffULL &&
3508 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
3509 JBD2_FEATURE_INCOMPAT_64BIT)) {
b31e1552 3510 ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
744692dc 3511 goto failed_mount_wq;
eb40a09c
JS		 3512 }
3513
d4da6c9c
LT		 3514 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
3515 jbd2_journal_set_features(sbi->s_journal,
3516 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
818d276c 3517 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
d4da6c9c
LT		 3518 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
3519 jbd2_journal_set_features(sbi->s_journal,
3520 JBD2_FEATURE_COMPAT_CHECKSUM, 0, 0);
818d276c
GS		 3521 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
3522 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
d4da6c9c
LT		 3523 } else {
3524 jbd2_journal_clear_features(sbi->s_journal,
3525 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
3526 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
3527 }
818d276c 3528
ac27a0ec
DK		 3529 /* We have now updated the journal if required, so we can
3530 * validate the data journaling mode. */
3531 switch (test_opt(sb, DATA_FLAGS)) {
3532 case 0:
3533 /* No mode set, assume a default based on the journal
63f57933
AM		 3534 * capabilities: ORDERED_DATA if the journal can
3535 * cope, else JOURNAL_DATA
3536 */
dab291af
MC		 3537 if (jbd2_journal_check_available_features
3538 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
fd8c37ec 3539 set_opt(sb, ORDERED_DATA);
ac27a0ec 3540 else
fd8c37ec 3541 set_opt(sb, JOURNAL_DATA);
ac27a0ec
DK		 3542 break;
3543
617ba13b
MC		 3544 case EXT4_MOUNT_ORDERED_DATA:
3545 case EXT4_MOUNT_WRITEBACK_DATA:
dab291af
MC		 3546 if (!jbd2_journal_check_available_features
3547 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
b31e1552
ES		 3548 ext4_msg(sb, KERN_ERR, "Journal does not support "
3549 "requested data journaling mode");
744692dc 3550 goto failed_mount_wq;
ac27a0ec
DK		 3551 }
3552 default:
3553 break;
3554 }
b3881f74 3555 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
ac27a0ec 3556
18aadd47
BJ		 3557 sbi->s_journal->j_commit_callback = ext4_journal_commit_callback;
3558
ce7e010a
TT		 3559 /*
3560 * The journal may have updated the bg summary counts, so we
3561 * need to update the global counters.
3562 */
57042651 3563 percpu_counter_set(&sbi->s_freeclusters_counter,
5dee5437 3564 ext4_count_free_clusters(sb));
ce7e010a
TT		 3565 percpu_counter_set(&sbi->s_freeinodes_counter,
3566 ext4_count_free_inodes(sb));
3567 percpu_counter_set(&sbi->s_dirs_counter,
3568 ext4_count_dirs(sb));
57042651 3569 percpu_counter_set(&sbi->s_dirtyclusters_counter, 0);
206f7ab4 3570
ce7e010a 3571no_journal:
fd89d5f2
TH		 3572 /*
3573 * The maximum number of concurrent works can be high and
3574 * concurrency isn't really necessary. Limit it to 1.
3575 */
3576 EXT4_SB(sb)->dio_unwritten_wq =
ae005cbe 3577 alloc_workqueue("ext4-dio-unwritten", WQ_MEM_RECLAIM | WQ_UNBOUND, 1);
4c0425ff
MC		 3578 if (!EXT4_SB(sb)->dio_unwritten_wq) {
3579 printk(KERN_ERR "EXT4-fs: failed to create DIO workqueue\n");
3580 goto failed_mount_wq;
3581 }
3582
ac27a0ec 3583 /*
dab291af 3584 * The jbd2_journal_load will have done any necessary log recovery,
ac27a0ec
DK		 3585 * so we can safely mount the rest of the filesystem now.
3586 */
3587
1d1fe1ee
DH		 3588 root = ext4_iget(sb, EXT4_ROOT_INO);
3589 if (IS_ERR(root)) {
b31e1552 3590 ext4_msg(sb, KERN_ERR, "get root inode failed");
1d1fe1ee 3591 ret = PTR_ERR(root);
32a9bb57 3592 root = NULL;
ac27a0ec
DK		 3593 goto failed_mount4;
3594 }
3595 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
b31e1552 3596 ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
94bf608a 3597 iput(root);
ac27a0ec
DK		 3598 goto failed_mount4;
3599 }
1d1fe1ee
DH		 3600 sb->s_root = d_alloc_root(root);
3601 if (!sb->s_root) {
94bf608a 3602 iput(root);
b31e1552 3603 ext4_msg(sb, KERN_ERR, "get root dentry failed");
1d1fe1ee
DH		 3604 ret = -ENOMEM;
3605 goto failed_mount4;
3606 }
ac27a0ec 3607
2b2d6d01 3608 ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY);
ef7f3835
KS		 3609
3610 /* determine the minimum size of new large inodes, if present */
3611 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
3612 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
3613 EXT4_GOOD_OLD_INODE_SIZE;
3614 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3615 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) {
3616 if (sbi->s_want_extra_isize <
3617 le16_to_cpu(es->s_want_extra_isize))
3618 sbi->s_want_extra_isize =
3619 le16_to_cpu(es->s_want_extra_isize);
3620 if (sbi->s_want_extra_isize <
3621 le16_to_cpu(es->s_min_extra_isize))
3622 sbi->s_want_extra_isize =
3623 le16_to_cpu(es->s_min_extra_isize);
3624 }
3625 }
3626 /* Check if enough inode space is available */
3627 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
3628 sbi->s_inode_size) {
3629 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
3630 EXT4_GOOD_OLD_INODE_SIZE;
b31e1552
ES		 3631 ext4_msg(sb, KERN_INFO, "required extra inode space not"
3632 "available");
ef7f3835
KS		 3633 }
3634
6fd058f7
TT		 3635 err = ext4_setup_system_zone(sb);
3636 if (err) {
b31e1552 3637 ext4_msg(sb, KERN_ERR, "failed to initialize system "
fbe845dd 3638 "zone (%d)", err);
94bf608a 3639 goto failed_mount4a;
6fd058f7
TT		 3640 }
3641
c2774d84
AK		 3642 ext4_ext_init(sb);
3643 err = ext4_mb_init(sb, needs_recovery);
3644 if (err) {
421f91d2 3645 ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)",
b31e1552 3646 err);
dcf2d804 3647 goto failed_mount5;
c2774d84
AK		 3648 }
3649
bfff6873
LC		 3650 err = ext4_register_li_request(sb, first_not_zeroed);
3651 if (err)
dcf2d804 3652 goto failed_mount6;
bfff6873 3653
3197ebdb
TT		 3654 sbi->s_kobj.kset = ext4_kset;
3655 init_completion(&sbi->s_kobj_unregister);
3656 err = kobject_init_and_add(&sbi->s_kobj, &ext4_ktype, NULL,
3657 "%s", sb->s_id);
dcf2d804
TM		 3658 if (err)
3659 goto failed_mount7;
3197ebdb 3660
617ba13b
MC		 3661 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
3662 ext4_orphan_cleanup(sb, es);
3663 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
0390131b 3664 if (needs_recovery) {
b31e1552 3665 ext4_msg(sb, KERN_INFO, "recovery complete");
0390131b
FM		 3666 ext4_mark_recovery_complete(sb, es);
3667 }
3668 if (EXT4_SB(sb)->s_journal) {
3669 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
3670 descr = " journalled data mode";
3671 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
3672 descr = " ordered data mode";
3673 else
3674 descr = " writeback data mode";
3675 } else
3676 descr = "out journal";
3677
d4c402d9 3678 ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. "
8b67f04a
TT		 3679 "Opts: %s%s%s", descr, sbi->s_es->s_mount_opts,
3680 *sbi->s_es->s_mount_opts ? "; " : "", orig_data);
ac27a0ec 3681
66e61a9e
TT		 3682 if (es->s_error_count)
3683 mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */
ac27a0ec 3684
d4c402d9 3685 kfree(orig_data);
ac27a0ec
DK		 3686 return 0;
3687
617ba13b 3688cantfind_ext4:
ac27a0ec 3689 if (!silent)
b31e1552 3690 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
ac27a0ec
DK		 3691 goto failed_mount;
3692
dcf2d804
TM		 3693failed_mount7:
3694 ext4_unregister_li_request(sb);
3695failed_mount6:
dcf2d804 3696 ext4_mb_release(sb);
94bf608a
AV		 3697failed_mount5:
3698 ext4_ext_release(sb);
dcf2d804 3699 ext4_release_system_zone(sb);
94bf608a
AV		 3700failed_mount4a:
3701 dput(sb->s_root);
32a9bb57 3702 sb->s_root = NULL;
94bf608a 3703failed_mount4:
b31e1552 3704 ext4_msg(sb, KERN_ERR, "mount failed");
4c0425ff
MC		 3705 destroy_workqueue(EXT4_SB(sb)->dio_unwritten_wq);
3706failed_mount_wq:
0390131b
FM		 3707 if (sbi->s_journal) {
3708 jbd2_journal_destroy(sbi->s_journal);
3709 sbi->s_journal = NULL;
3710 }
ac27a0ec 3711failed_mount3:
04496411 3712 del_timer(&sbi->s_err_report);
9933fc0a
TT		 3713 if (sbi->s_flex_groups)
3714 ext4_kvfree(sbi->s_flex_groups);
57042651 3715 percpu_counter_destroy(&sbi->s_freeclusters_counter);
ce7e010a
TT		 3716 percpu_counter_destroy(&sbi->s_freeinodes_counter);
3717 percpu_counter_destroy(&sbi->s_dirs_counter);
57042651 3718 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
c5e06d10
JL		 3719 if (sbi->s_mmp_tsk)
3720 kthread_stop(sbi->s_mmp_tsk);
ac27a0ec
DK		 3721failed_mount2:
3722 for (i = 0; i < db_count; i++)
3723 brelse(sbi->s_group_desc[i]);
f18a5f21 3724 ext4_kvfree(sbi->s_group_desc);
ac27a0ec 3725failed_mount:
240799cd 3726 if (sbi->s_proc) {
9f6200bb 3727 remove_proc_entry(sb->s_id, ext4_proc_root);
240799cd 3728 }
ac27a0ec
DK		 3729#ifdef CONFIG_QUOTA
3730 for (i = 0; i < MAXQUOTAS; i++)
3731 kfree(sbi->s_qf_names[i]);
3732#endif
617ba13b 3733 ext4_blkdev_remove(sbi);
ac27a0ec
DK		 3734 brelse(bh);
3735out_fail:
3736 sb->s_fs_info = NULL;
f6830165 3737 kfree(sbi->s_blockgroup_lock);
ac27a0ec 3738 kfree(sbi);
dcc7dae3 3739out_free_orig:
d4c402d9 3740 kfree(orig_data);
1d1fe1ee 3741 return ret;
ac27a0ec
DK		 3742}
3743
3744/*
3745 * Setup any per-fs journal parameters now. We'll do this both on
3746 * initial mount, once the journal has been initialised but before we've
3747 * done any recovery; and again on any subsequent remount.
3748 */
617ba13b 3749static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
ac27a0ec 3750{
617ba13b 3751 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 3752
30773840
TT		 3753 journal->j_commit_interval = sbi->s_commit_interval;
3754 journal->j_min_batch_time = sbi->s_min_batch_time;
3755 journal->j_max_batch_time = sbi->s_max_batch_time;
ac27a0ec 3756
a931da6a 3757 write_lock(&journal->j_state_lock);
ac27a0ec 3758 if (test_opt(sb, BARRIER))
dab291af 3759 journal->j_flags |= JBD2_BARRIER;
ac27a0ec 3760 else
dab291af 3761 journal->j_flags &= ~JBD2_BARRIER;
5bf5683a
HK		 3762 if (test_opt(sb, DATA_ERR_ABORT))
3763 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
3764 else
3765 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
a931da6a 3766 write_unlock(&journal->j_state_lock);
ac27a0ec
DK		 3767}
3768
617ba13b 3769static journal_t *ext4_get_journal(struct super_block *sb,
ac27a0ec
DK		 3770 unsigned int journal_inum)
3771{
3772 struct inode *journal_inode;
3773 journal_t *journal;
3774
0390131b
FM		 3775 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3776
ac27a0ec
DK		 3777 /* First, test for the existence of a valid inode on disk. Bad
3778 * things happen if we iget() an unused inode, as the subsequent
3779 * iput() will try to delete it. */
3780
1d1fe1ee
DH		 3781 journal_inode = ext4_iget(sb, journal_inum);
3782 if (IS_ERR(journal_inode)) {
b31e1552 3783 ext4_msg(sb, KERN_ERR, "no journal found");
ac27a0ec
DK		 3784 return NULL;
3785 }
3786 if (!journal_inode->i_nlink) {
3787 make_bad_inode(journal_inode);
3788 iput(journal_inode);
b31e1552 3789 ext4_msg(sb, KERN_ERR, "journal inode is deleted");
ac27a0ec
DK		 3790 return NULL;
3791 }
3792
e5f8eab8 3793 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
ac27a0ec 3794 journal_inode, journal_inode->i_size);
1d1fe1ee 3795 if (!S_ISREG(journal_inode->i_mode)) {
b31e1552 3796 ext4_msg(sb, KERN_ERR, "invalid journal inode");
ac27a0ec
DK		 3797 iput(journal_inode);
3798 return NULL;
3799 }
3800
dab291af 3801 journal = jbd2_journal_init_inode(journal_inode);
ac27a0ec 3802 if (!journal) {
b31e1552 3803 ext4_msg(sb, KERN_ERR, "Could not load journal inode");
ac27a0ec
DK		 3804 iput(journal_inode);
3805 return NULL;
3806 }
3807 journal->j_private = sb;
617ba13b 3808 ext4_init_journal_params(sb, journal);
ac27a0ec
DK		 3809 return journal;
3810}
3811
617ba13b 3812static journal_t *ext4_get_dev_journal(struct super_block *sb,
ac27a0ec
DK		 3813 dev_t j_dev)
3814{
2b2d6d01 3815 struct buffer_head *bh;
ac27a0ec 3816 journal_t *journal;
617ba13b
MC		 3817 ext4_fsblk_t start;
3818 ext4_fsblk_t len;
ac27a0ec 3819 int hblock, blocksize;
617ba13b 3820 ext4_fsblk_t sb_block;
ac27a0ec 3821 unsigned long offset;
2b2d6d01 3822 struct ext4_super_block *es;
ac27a0ec
DK		 3823 struct block_device *bdev;
3824
0390131b
FM		 3825 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3826
b31e1552 3827 bdev = ext4_blkdev_get(j_dev, sb);
ac27a0ec
DK		 3828 if (bdev == NULL)
3829 return NULL;
3830
ac27a0ec 3831 blocksize = sb->s_blocksize;
e1defc4f 3832 hblock = bdev_logical_block_size(bdev);
ac27a0ec 3833 if (blocksize < hblock) {
b31e1552
ES		 3834 ext4_msg(sb, KERN_ERR,
3835 "blocksize too small for journal device");
ac27a0ec
DK		 3836 goto out_bdev;
3837 }
3838
617ba13b
MC		 3839 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
3840 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
ac27a0ec
DK		 3841 set_blocksize(bdev, blocksize);
3842 if (!(bh = __bread(bdev, sb_block, blocksize))) {
b31e1552
ES		 3843 ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
3844 "external journal");
ac27a0ec
DK		 3845 goto out_bdev;
3846 }
3847
617ba13b
MC		 3848 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
3849 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
ac27a0ec 3850 !(le32_to_cpu(es->s_feature_incompat) &
617ba13b 3851 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
b31e1552
ES		 3852 ext4_msg(sb, KERN_ERR, "external journal has "
3853 "bad superblock");
ac27a0ec
DK		 3854 brelse(bh);
3855 goto out_bdev;
3856 }
3857
617ba13b 3858 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
b31e1552 3859 ext4_msg(sb, KERN_ERR, "journal UUID does not match");
ac27a0ec
DK		 3860 brelse(bh);
3861 goto out_bdev;
3862 }
3863
bd81d8ee 3864 len = ext4_blocks_count(es);
ac27a0ec
DK		 3865 start = sb_block + 1;
3866 brelse(bh); /* we're done with the superblock */
3867
dab291af 3868 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
ac27a0ec
DK		 3869 start, len, blocksize);
3870 if (!journal) {
b31e1552 3871 ext4_msg(sb, KERN_ERR, "failed to create device journal");
ac27a0ec
DK		 3872 goto out_bdev;
3873 }
3874 journal->j_private = sb;
3875 ll_rw_block(READ, 1, &journal->j_sb_buffer);
3876 wait_on_buffer(journal->j_sb_buffer);
3877 if (!buffer_uptodate(journal->j_sb_buffer)) {
b31e1552 3878 ext4_msg(sb, KERN_ERR, "I/O error on journal device");
ac27a0ec
DK		 3879 goto out_journal;
3880 }
3881 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
b31e1552
ES		 3882 ext4_msg(sb, KERN_ERR, "External journal has more than one "
3883 "user (unsupported) - %d",
ac27a0ec
DK		 3884 be32_to_cpu(journal->j_superblock->s_nr_users));
3885 goto out_journal;
3886 }
617ba13b
MC		 3887 EXT4_SB(sb)->journal_bdev = bdev;
3888 ext4_init_journal_params(sb, journal);
ac27a0ec 3889 return journal;
0b8e58a1 3890
ac27a0ec 3891out_journal:
dab291af 3892 jbd2_journal_destroy(journal);
ac27a0ec 3893out_bdev:
617ba13b 3894 ext4_blkdev_put(bdev);
ac27a0ec
DK		 3895 return NULL;
3896}
3897
617ba13b
MC		 3898static int ext4_load_journal(struct super_block *sb,
3899 struct ext4_super_block *es,
ac27a0ec
DK		 3900 unsigned long journal_devnum)
3901{
3902 journal_t *journal;
3903 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
3904 dev_t journal_dev;
3905 int err = 0;
3906 int really_read_only;
3907
0390131b
FM		 3908 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3909
ac27a0ec
DK		 3910 if (journal_devnum &&
3911 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
b31e1552
ES		 3912 ext4_msg(sb, KERN_INFO, "external journal device major/minor "
3913 "numbers have changed");
ac27a0ec
DK		 3914 journal_dev = new_decode_dev(journal_devnum);
3915 } else
3916 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
3917
3918 really_read_only = bdev_read_only(sb->s_bdev);
3919
3920 /*
3921 * Are we loading a blank journal or performing recovery after a
3922 * crash? For recovery, we need to check in advance whether we
3923 * can get read-write access to the device.
3924 */
617ba13b 3925 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
ac27a0ec 3926 if (sb->s_flags & MS_RDONLY) {
b31e1552
ES		 3927 ext4_msg(sb, KERN_INFO, "INFO: recovery "
3928 "required on readonly filesystem");
ac27a0ec 3929 if (really_read_only) {
b31e1552
ES		 3930 ext4_msg(sb, KERN_ERR, "write access "
3931 "unavailable, cannot proceed");
ac27a0ec
DK		 3932 return -EROFS;
3933 }
b31e1552
ES		 3934 ext4_msg(sb, KERN_INFO, "write access will "
3935 "be enabled during recovery");
ac27a0ec
DK		 3936 }
3937 }
3938
3939 if (journal_inum && journal_dev) {
b31e1552
ES		 3940 ext4_msg(sb, KERN_ERR, "filesystem has both journal "
3941 "and inode journals!");
ac27a0ec
DK		 3942 return -EINVAL;
3943 }
3944
3945 if (journal_inum) {
617ba13b 3946 if (!(journal = ext4_get_journal(sb, journal_inum)))
ac27a0ec
DK		 3947 return -EINVAL;
3948 } else {
617ba13b 3949 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
ac27a0ec
DK		 3950 return -EINVAL;
3951 }
3952
90576c0b 3953 if (!(journal->j_flags & JBD2_BARRIER))
b31e1552 3954 ext4_msg(sb, KERN_INFO, "barriers disabled");
4776004f 3955
617ba13b 3956 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
dab291af 3957 err = jbd2_journal_wipe(journal, !really_read_only);
1c13d5c0
TT		 3958 if (!err) {
3959 char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL);
3960 if (save)
3961 memcpy(save, ((char *) es) +
3962 EXT4_S_ERR_START, EXT4_S_ERR_LEN);
dab291af 3963 err = jbd2_journal_load(journal);
1c13d5c0
TT		 3964 if (save)
3965 memcpy(((char *) es) + EXT4_S_ERR_START,
3966 save, EXT4_S_ERR_LEN);
3967 kfree(save);
3968 }
ac27a0ec
DK		 3969
3970 if (err) {
b31e1552 3971 ext4_msg(sb, KERN_ERR, "error loading journal");
dab291af 3972 jbd2_journal_destroy(journal);
ac27a0ec
DK		 3973 return err;
3974 }
3975
617ba13b
MC		 3976 EXT4_SB(sb)->s_journal = journal;
3977 ext4_clear_journal_err(sb, es);
ac27a0ec 3978
c41303ce 3979 if (!really_read_only && journal_devnum &&
ac27a0ec
DK		 3980 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
3981 es->s_journal_dev = cpu_to_le32(journal_devnum);
ac27a0ec
DK		 3982
3983 /* Make sure we flush the recovery flag to disk. */
e2d67052 3984 ext4_commit_super(sb, 1);
ac27a0ec
DK		 3985 }
3986
3987 return 0;
3988}
3989
e2d67052 3990static int ext4_commit_super(struct super_block *sb, int sync)
ac27a0ec 3991{
e2d67052 3992 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
617ba13b 3993 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
c4be0c1d 3994 int error = 0;
ac27a0ec 3995
7c2e7087 3996 if (!sbh || block_device_ejected(sb))
c4be0c1d 3997 return error;
914258bf
TT		 3998 if (buffer_write_io_error(sbh)) {
3999 /*
4000 * Oh, dear. A previous attempt to write the
4001 * superblock failed. This could happen because the
4002 * USB device was yanked out. Or it could happen to
4003 * be a transient write error and maybe the block will
4004 * be remapped. Nothing we can do but to retry the
4005 * write and hope for the best.
4006 */
b31e1552
ES		 4007 ext4_msg(sb, KERN_ERR, "previous I/O error to "
4008 "superblock detected");
914258bf
TT		 4009 clear_buffer_write_io_error(sbh);
4010 set_buffer_uptodate(sbh);
4011 }
71290b36
TT		 4012 /*
4013 * If the file system is mounted read-only, don't update the
4014 * superblock write time. This avoids updating the superblock
4015 * write time when we are mounting the root file system
4016 * read/only but we need to replay the journal; at that point,
4017 * for people who are east of GMT and who make their clock
4018 * tick in localtime for Windows bug-for-bug compatibility,
4019 * the clock is set in the future, and this will cause e2fsck
4020 * to complain and force a full file system check.
4021 */
4022 if (!(sb->s_flags & MS_RDONLY))
4023 es->s_wtime = cpu_to_le32(get_seconds());
f613dfcb
TT		 4024 if (sb->s_bdev->bd_part)
4025 es->s_kbytes_written =
4026 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written +
afc32f7e
TT		 4027 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
4028 EXT4_SB(sb)->s_sectors_written_start) >> 1));
f613dfcb
TT		 4029 else
4030 es->s_kbytes_written =
4031 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written);
57042651
TT		 4032 ext4_free_blocks_count_set(es,
4033 EXT4_C2B(EXT4_SB(sb), percpu_counter_sum_positive(
4034 &EXT4_SB(sb)->s_freeclusters_counter)));
ce7e010a
TT		 4035 es->s_free_inodes_count =
4036 cpu_to_le32(percpu_counter_sum_positive(
4037 &EXT4_SB(sb)->s_freeinodes_counter));
7234ab2a 4038 sb->s_dirt = 0;
ac27a0ec
DK		 4039 BUFFER_TRACE(sbh, "marking dirty");
4040 mark_buffer_dirty(sbh);
914258bf 4041 if (sync) {
c4be0c1d
TS		 4042 error = sync_dirty_buffer(sbh);
4043 if (error)
4044 return error;
4045
4046 error = buffer_write_io_error(sbh);
4047 if (error) {
b31e1552
ES		 4048 ext4_msg(sb, KERN_ERR, "I/O error while writing "
4049 "superblock");
914258bf
TT		 4050 clear_buffer_write_io_error(sbh);
4051 set_buffer_uptodate(sbh);
4052 }
4053 }
c4be0c1d 4054 return error;
ac27a0ec
DK		 4055}
4056
ac27a0ec
DK		 4057/*
4058 * Have we just finished recovery? If so, and if we are mounting (or
4059 * remounting) the filesystem readonly, then we will end up with a
4060 * consistent fs on disk. Record that fact.
4061 */
2b2d6d01
TT		 4062static void ext4_mark_recovery_complete(struct super_block *sb,
4063 struct ext4_super_block *es)
ac27a0ec 4064{
617ba13b 4065 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 4066
0390131b
FM		 4067 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
4068 BUG_ON(journal != NULL);
4069 return;
4070 }
dab291af 4071 jbd2_journal_lock_updates(journal);
7ffe1ea8
HK		 4072 if (jbd2_journal_flush(journal) < 0)
4073 goto out;
4074
617ba13b 4075 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
ac27a0ec 4076 sb->s_flags & MS_RDONLY) {
617ba13b 4077 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
e2d67052 4078 ext4_commit_super(sb, 1);
ac27a0ec 4079 }
7ffe1ea8
HK		 4080
4081out:
dab291af 4082 jbd2_journal_unlock_updates(journal);
ac27a0ec
DK		 4083}
4084
4085/*
4086 * If we are mounting (or read-write remounting) a filesystem whose journal
4087 * has recorded an error from a previous lifetime, move that error to the
4088 * main filesystem now.
4089 */
2b2d6d01
TT		 4090static void ext4_clear_journal_err(struct super_block *sb,
4091 struct ext4_super_block *es)
ac27a0ec
DK		 4092{
4093 journal_t *journal;
4094 int j_errno;
4095 const char *errstr;
4096
0390131b
FM		 4097 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4098
617ba13b 4099 journal = EXT4_SB(sb)->s_journal;
ac27a0ec
DK		 4100
4101 /*
4102 * Now check for any error status which may have been recorded in the
617ba13b 4103 * journal by a prior ext4_error() or ext4_abort()
ac27a0ec
DK		 4104 */
4105
dab291af 4106 j_errno = jbd2_journal_errno(journal);
ac27a0ec
DK		 4107 if (j_errno) {
4108 char nbuf[16];
4109
617ba13b 4110 errstr = ext4_decode_error(sb, j_errno, nbuf);
12062ddd 4111 ext4_warning(sb, "Filesystem error recorded "
ac27a0ec 4112 "from previous mount: %s", errstr);
12062ddd 4113 ext4_warning(sb, "Marking fs in need of filesystem check.");
ac27a0ec 4114
617ba13b
MC		 4115 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
4116 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
e2d67052 4117 ext4_commit_super(sb, 1);
ac27a0ec 4118
dab291af 4119 jbd2_journal_clear_err(journal);
ac27a0ec
DK		 4120 }
4121}
4122
4123/*
4124 * Force the running and committing transactions to commit,
4125 * and wait on the commit.
4126 */
617ba13b 4127int ext4_force_commit(struct super_block *sb)
ac27a0ec
DK		 4128{
4129 journal_t *journal;
0390131b 4130 int ret = 0;
ac27a0ec
DK		 4131
4132 if (sb->s_flags & MS_RDONLY)
4133 return 0;
4134
617ba13b 4135 journal = EXT4_SB(sb)->s_journal;
6b0310fb 4136 if (journal) {
437f88cc 4137 vfs_check_frozen(sb, SB_FREEZE_TRANS);
0390131b 4138 ret = ext4_journal_force_commit(journal);
6b0310fb 4139 }
0390131b 4140
ac27a0ec
DK		 4141 return ret;
4142}
4143
2b2d6d01 4144static void ext4_write_super(struct super_block *sb)
ac27a0ec 4145{
ebc1ac16 4146 lock_super(sb);
9ca92389 4147 ext4_commit_super(sb, 1);
ebc1ac16 4148 unlock_super(sb);
ac27a0ec
DK		 4149}
4150
617ba13b 4151static int ext4_sync_fs(struct super_block *sb, int wait)
ac27a0ec 4152{
14ce0cb4 4153 int ret = 0;
9eddacf9 4154 tid_t target;
8d5d02e6 4155 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4156
9bffad1e 4157 trace_ext4_sync_fs(sb, wait);
8d5d02e6
MC		 4158 flush_workqueue(sbi->dio_unwritten_wq);
4159 if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
9ca92389 4160 if (wait)
8d5d02e6 4161 jbd2_log_wait_commit(sbi->s_journal, target);
0390131b 4162 }
14ce0cb4 4163 return ret;
ac27a0ec
DK		 4164}
4165
4166/*
4167 * LVM calls this function before a (read-only) snapshot is created. This
4168 * gives us a chance to flush the journal completely and mark the fs clean.
be4f27d3
YY		 4169 *
4170 * Note that only this function cannot bring a filesystem to be in a clean
4171 * state independently, because ext4 prevents a new handle from being started
4172 * by @sb->s_frozen, which stays in an upper layer. It thus needs help from
4173 * the upper layer.
ac27a0ec 4174 */
c4be0c1d 4175static int ext4_freeze(struct super_block *sb)
ac27a0ec 4176{
c4be0c1d
TS		 4177 int error = 0;
4178 journal_t *journal;
ac27a0ec 4179
9ca92389
TT		 4180 if (sb->s_flags & MS_RDONLY)
4181 return 0;
ac27a0ec 4182
9ca92389 4183 journal = EXT4_SB(sb)->s_journal;
7ffe1ea8 4184
9ca92389
TT		 4185 /* Now we set up the journal barrier. */
4186 jbd2_journal_lock_updates(journal);
ac27a0ec 4187
9ca92389
TT		 4188 /*
4189 * Don't clear the needs_recovery flag if we failed to flush
4190 * the journal.
4191 */
4192 error = jbd2_journal_flush(journal);
6b0310fb
ES		 4193 if (error < 0)
4194 goto out;
9ca92389
TT		 4195
4196 /* Journal blocked and flushed, clear needs_recovery flag. */
4197 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4198 error = ext4_commit_super(sb, 1);
6b0310fb
ES		 4199out:
4200 /* we rely on s_frozen to stop further updates */
4201 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
4202 return error;
ac27a0ec
DK		 4203}
4204
4205/*
4206 * Called by LVM after the snapshot is done. We need to reset the RECOVER
4207 * flag here, even though the filesystem is not technically dirty yet.
4208 */
c4be0c1d 4209static int ext4_unfreeze(struct super_block *sb)
ac27a0ec 4210{
9ca92389
TT		 4211 if (sb->s_flags & MS_RDONLY)
4212 return 0;
4213
4214 lock_super(sb);
4215 /* Reset the needs_recovery flag before the fs is unlocked. */
4216 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4217 ext4_commit_super(sb, 1);
4218 unlock_super(sb);
c4be0c1d 4219 return 0;
ac27a0ec
DK		 4220}
4221
673c6100
TT		 4222/*
4223 * Structure to save mount options for ext4_remount's benefit
4224 */
4225struct ext4_mount_options {
4226 unsigned long s_mount_opt;
a2595b8a 4227 unsigned long s_mount_opt2;
673c6100
TT		 4228 uid_t s_resuid;
4229 gid_t s_resgid;
4230 unsigned long s_commit_interval;
4231 u32 s_min_batch_time, s_max_batch_time;
4232#ifdef CONFIG_QUOTA
4233 int s_jquota_fmt;
4234 char *s_qf_names[MAXQUOTAS];
4235#endif
4236};
4237
2b2d6d01 4238static int ext4_remount(struct super_block *sb, int *flags, char *data)
ac27a0ec 4239{
2b2d6d01 4240 struct ext4_super_block *es;
617ba13b 4241 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4242 unsigned long old_sb_flags;
617ba13b 4243 struct ext4_mount_options old_opts;
c79d967d 4244 int enable_quota = 0;
8a266467 4245 ext4_group_t g;
b3881f74 4246 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
c5e06d10 4247 int err = 0;
ac27a0ec
DK		 4248#ifdef CONFIG_QUOTA
4249 int i;
4250#endif
d4c402d9 4251 char *orig_data = kstrdup(data, GFP_KERNEL);
ac27a0ec
DK		 4252
4253 /* Store the original options */
bbd6851a 4254 lock_super(sb);
ac27a0ec
DK		 4255 old_sb_flags = sb->s_flags;
4256 old_opts.s_mount_opt = sbi->s_mount_opt;
a2595b8a 4257 old_opts.s_mount_opt2 = sbi->s_mount_opt2;
ac27a0ec
DK		 4258 old_opts.s_resuid = sbi->s_resuid;
4259 old_opts.s_resgid = sbi->s_resgid;
4260 old_opts.s_commit_interval = sbi->s_commit_interval;
30773840
TT		 4261 old_opts.s_min_batch_time = sbi->s_min_batch_time;
4262 old_opts.s_max_batch_time = sbi->s_max_batch_time;
ac27a0ec
DK		 4263#ifdef CONFIG_QUOTA
4264 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
4265 for (i = 0; i < MAXQUOTAS; i++)
4266 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
4267#endif
b3881f74
TT		 4268 if (sbi->s_journal && sbi->s_journal->j_task->io_context)
4269 journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
ac27a0ec
DK		 4270
4271 /*
4272 * Allow the "check" option to be passed as a remount option.
4273 */
661aa520 4274 if (!parse_options(data, sb, NULL, &journal_ioprio, 1)) {
ac27a0ec
DK		 4275 err = -EINVAL;
4276 goto restore_opts;
4277 }
4278
4ab2f15b 4279 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
c67d859e 4280 ext4_abort(sb, "Abort forced by user");
ac27a0ec
DK		 4281
4282 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
482a7425 4283 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec
DK		 4284
4285 es = sbi->s_es;
4286
b3881f74 4287 if (sbi->s_journal) {
0390131b 4288 ext4_init_journal_params(sb, sbi->s_journal);
b3881f74
TT		 4289 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
4290 }
ac27a0ec 4291
661aa520 4292 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
4ab2f15b 4293 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) {
ac27a0ec
DK		 4294 err = -EROFS;
4295 goto restore_opts;
4296 }
4297
4298 if (*flags & MS_RDONLY) {
0f0dd62f
CH		 4299 err = dquot_suspend(sb, -1);
4300 if (err < 0)
c79d967d 4301 goto restore_opts;
c79d967d 4302
ac27a0ec
DK		 4303 /*
4304 * First of all, the unconditional stuff we have to do
4305 * to disable replay of the journal when we next remount
4306 */
4307 sb->s_flags |= MS_RDONLY;
4308
4309 /*
4310 * OK, test if we are remounting a valid rw partition
4311 * readonly, and if so set the rdonly flag and then
4312 * mark the partition as valid again.
4313 */
617ba13b
MC		 4314 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
4315 (sbi->s_mount_state & EXT4_VALID_FS))
ac27a0ec
DK		 4316 es->s_state = cpu_to_le16(sbi->s_mount_state);
4317
a63c9eb2 4318 if (sbi->s_journal)
0390131b 4319 ext4_mark_recovery_complete(sb, es);
ac27a0ec 4320 } else {
a13fb1a4
ES		 4321 /* Make sure we can mount this feature set readwrite */
4322 if (!ext4_feature_set_ok(sb, 0)) {
ac27a0ec
DK		 4323 err = -EROFS;
4324 goto restore_opts;
4325 }
8a266467
TT		 4326 /*
4327 * Make sure the group descriptor checksums
0b8e58a1 4328 * are sane. If they aren't, refuse to remount r/w.
8a266467
TT		 4329 */
4330 for (g = 0; g < sbi->s_groups_count; g++) {
4331 struct ext4_group_desc *gdp =
4332 ext4_get_group_desc(sb, g, NULL);
4333
4334 if (!ext4_group_desc_csum_verify(sbi, g, gdp)) {
b31e1552
ES		 4335 ext4_msg(sb, KERN_ERR,
4336 "ext4_remount: Checksum for group %u failed (%u!=%u)",
8a266467
TT		 4337 g, le16_to_cpu(ext4_group_desc_csum(sbi, g, gdp)),
4338 le16_to_cpu(gdp->bg_checksum));
4339 err = -EINVAL;
4340 goto restore_opts;
4341 }
4342 }
4343
ead6596b
ES		 4344 /*
4345 * If we have an unprocessed orphan list hanging
4346 * around from a previously readonly bdev mount,
4347 * require a full umount/remount for now.
4348 */
4349 if (es->s_last_orphan) {
b31e1552 4350 ext4_msg(sb, KERN_WARNING, "Couldn't "
ead6596b
ES		 4351 "remount RDWR because of unprocessed "
4352 "orphan inode list. Please "
b31e1552 4353 "umount/remount instead");
ead6596b
ES		 4354 err = -EINVAL;
4355 goto restore_opts;
4356 }
4357
ac27a0ec
DK		 4358 /*
4359 * Mounting a RDONLY partition read-write, so reread
4360 * and store the current valid flag. (It may have
4361 * been changed by e2fsck since we originally mounted
4362 * the partition.)
4363 */
0390131b
FM		 4364 if (sbi->s_journal)
4365 ext4_clear_journal_err(sb, es);
ac27a0ec 4366 sbi->s_mount_state = le16_to_cpu(es->s_state);
2b2d6d01 4367 if (!ext4_setup_super(sb, es, 0))
ac27a0ec 4368 sb->s_flags &= ~MS_RDONLY;
c5e06d10
JL		 4369 if (EXT4_HAS_INCOMPAT_FEATURE(sb,
4370 EXT4_FEATURE_INCOMPAT_MMP))
4371 if (ext4_multi_mount_protect(sb,
4372 le64_to_cpu(es->s_mmp_block))) {
4373 err = -EROFS;
4374 goto restore_opts;
4375 }
c79d967d 4376 enable_quota = 1;
ac27a0ec
DK		 4377 }
4378 }
bfff6873
LC		 4379
4380 /*
4381 * Reinitialize lazy itable initialization thread based on
4382 * current settings
4383 */
4384 if ((sb->s_flags & MS_RDONLY) || !test_opt(sb, INIT_INODE_TABLE))
4385 ext4_unregister_li_request(sb);
4386 else {
4387 ext4_group_t first_not_zeroed;
4388 first_not_zeroed = ext4_has_uninit_itable(sb);
4389 ext4_register_li_request(sb, first_not_zeroed);
4390 }
4391
6fd058f7 4392 ext4_setup_system_zone(sb);
0390131b 4393 if (sbi->s_journal == NULL)
e2d67052 4394 ext4_commit_super(sb, 1);
0390131b 4395
ac27a0ec
DK		 4396#ifdef CONFIG_QUOTA
4397 /* Release old quota file names */
4398 for (i = 0; i < MAXQUOTAS; i++)
4399 if (old_opts.s_qf_names[i] &&
4400 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
4401 kfree(old_opts.s_qf_names[i]);
4402#endif
bbd6851a 4403 unlock_super(sb);
c79d967d 4404 if (enable_quota)
0f0dd62f 4405 dquot_resume(sb, -1);
d4c402d9
CW		 4406
4407 ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s", orig_data);
4408 kfree(orig_data);
ac27a0ec 4409 return 0;
0b8e58a1 4410
ac27a0ec
DK		 4411restore_opts:
4412 sb->s_flags = old_sb_flags;
4413 sbi->s_mount_opt = old_opts.s_mount_opt;
a2595b8a 4414 sbi->s_mount_opt2 = old_opts.s_mount_opt2;
ac27a0ec
DK		 4415 sbi->s_resuid = old_opts.s_resuid;
4416 sbi->s_resgid = old_opts.s_resgid;
4417 sbi->s_commit_interval = old_opts.s_commit_interval;
30773840
TT		 4418 sbi->s_min_batch_time = old_opts.s_min_batch_time;
4419 sbi->s_max_batch_time = old_opts.s_max_batch_time;
ac27a0ec
DK		 4420#ifdef CONFIG_QUOTA
4421 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
4422 for (i = 0; i < MAXQUOTAS; i++) {
4423 if (sbi->s_qf_names[i] &&
4424 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
4425 kfree(sbi->s_qf_names[i]);
4426 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
4427 }
4428#endif
bbd6851a 4429 unlock_super(sb);
d4c402d9 4430 kfree(orig_data);
ac27a0ec
DK		 4431 return err;
4432}
4433
f975d6bc
TT		 4434/*
4435 * Note: calculating the overhead so we can be compatible with
4436 * historical BSD practice is quite difficult in the face of
4437 * clusters/bigalloc. This is because multiple metadata blocks from
4438 * different block group can end up in the same allocation cluster.
4439 * Calculating the exact overhead in the face of clustered allocation
4440 * requires either O(all block bitmaps) in memory or O(number of block
4441 * groups**2) in time. We will still calculate the superblock for
4442 * older file systems --- and if we come across with a bigalloc file
4443 * system with zero in s_overhead_clusters the estimate will be close to
4444 * correct especially for very large cluster sizes --- but for newer
4445 * file systems, it's better to calculate this figure once at mkfs
4446 * time, and store it in the superblock. If the superblock value is
4447 * present (even for non-bigalloc file systems), we will use it.
4448 */
2b2d6d01 4449static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
ac27a0ec
DK		 4450{
4451 struct super_block *sb = dentry->d_sb;
617ba13b
MC		 4452 struct ext4_sb_info *sbi = EXT4_SB(sb);
4453 struct ext4_super_block *es = sbi->s_es;
f975d6bc 4454 struct ext4_group_desc *gdp;
960cc398 4455 u64 fsid;
d02a9391 4456 s64 bfree;
ac27a0ec 4457
5e70030d
BP		 4458 if (test_opt(sb, MINIX_DF)) {
4459 sbi->s_overhead_last = 0;
f975d6bc
TT		 4460 } else if (es->s_overhead_clusters) {
4461 sbi->s_overhead_last = le32_to_cpu(es->s_overhead_clusters);
6bc9feff 4462 } else if (sbi->s_blocks_last != ext4_blocks_count(es)) {
8df9675f 4463 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
5e70030d 4464 ext4_fsblk_t overhead = 0;
ac27a0ec
DK		 4465
4466 /*
5e70030d
BP		 4467 * Compute the overhead (FS structures). This is constant
4468 * for a given filesystem unless the number of block groups
4469 * changes so we cache the previous value until it does.
ac27a0ec
DK		 4470 */
4471
4472 /*
4473 * All of the blocks before first_data_block are
4474 * overhead
4475 */
f975d6bc 4476 overhead = EXT4_B2C(sbi, le32_to_cpu(es->s_first_data_block));
ac27a0ec
DK		 4477
4478 /*
f975d6bc 4479 * Add the overhead found in each block group
ac27a0ec
DK		 4480 */
4481 for (i = 0; i < ngroups; i++) {
f975d6bc
TT		 4482 gdp = ext4_get_group_desc(sb, i, NULL);
4483 overhead += ext4_num_overhead_clusters(sb, i, gdp);
ac27a0ec
DK		 4484 cond_resched();
4485 }
5e70030d
BP		 4486 sbi->s_overhead_last = overhead;
4487 smp_wmb();
6bc9feff 4488 sbi->s_blocks_last = ext4_blocks_count(es);
ac27a0ec
DK		 4489 }
4490
617ba13b 4491 buf->f_type = EXT4_SUPER_MAGIC;
ac27a0ec 4492 buf->f_bsize = sb->s_blocksize;
f975d6bc
TT		 4493 buf->f_blocks = (ext4_blocks_count(es) -
4494 EXT4_C2B(sbi, sbi->s_overhead_last));
57042651
TT		 4495 bfree = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) -
4496 percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter);
d02a9391 4497 /* prevent underflow in case that few free space is available */
57042651 4498 buf->f_bfree = EXT4_C2B(sbi, max_t(s64, bfree, 0));
bd81d8ee
LV		 4499 buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es);
4500 if (buf->f_bfree < ext4_r_blocks_count(es))
ac27a0ec
DK		 4501 buf->f_bavail = 0;
4502 buf->f_files = le32_to_cpu(es->s_inodes_count);
52d9f3b4 4503 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
617ba13b 4504 buf->f_namelen = EXT4_NAME_LEN;
960cc398
PE		 4505 fsid = le64_to_cpup((void *)es->s_uuid) ^
4506 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
4507 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
4508 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
0b8e58a1 4509
ac27a0ec
DK		 4510 return 0;
4511}
4512
0b8e58a1
AD		 4513/* Helper function for writing quotas on sync - we need to start transaction
4514 * before quota file is locked for write. Otherwise the are possible deadlocks:
ac27a0ec 4515 * Process 1 Process 2
617ba13b 4516 * ext4_create() quota_sync()
a269eb18 4517 * jbd2_journal_start() write_dquot()
871a2931 4518 * dquot_initialize() down(dqio_mutex)
dab291af 4519 * down(dqio_mutex) jbd2_journal_start()
ac27a0ec
DK		 4520 *
4521 */
4522
4523#ifdef CONFIG_QUOTA
4524
4525static inline struct inode *dquot_to_inode(struct dquot *dquot)
4526{
4527 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
4528}
4529
617ba13b 4530static int ext4_write_dquot(struct dquot *dquot)
ac27a0ec
DK		 4531{
4532 int ret, err;
4533 handle_t *handle;
4534 struct inode *inode;
4535
4536 inode = dquot_to_inode(dquot);
617ba13b 4537 handle = ext4_journal_start(inode,
0b8e58a1 4538 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 4539 if (IS_ERR(handle))
4540 return PTR_ERR(handle);
4541 ret = dquot_commit(dquot);
617ba13b 4542 err = ext4_journal_stop(handle);
ac27a0ec
DK		 4543 if (!ret)
4544 ret = err;
4545 return ret;
4546}
4547
617ba13b 4548static int ext4_acquire_dquot(struct dquot *dquot)
ac27a0ec
DK		 4549{
4550 int ret, err;
4551 handle_t *handle;
4552
617ba13b 4553 handle = ext4_journal_start(dquot_to_inode(dquot),
0b8e58a1 4554 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 4555 if (IS_ERR(handle))
4556 return PTR_ERR(handle);
4557 ret = dquot_acquire(dquot);
617ba13b 4558 err = ext4_journal_stop(handle);
ac27a0ec
DK		 4559 if (!ret)
4560 ret = err;
4561 return ret;
4562}
4563
617ba13b 4564static int ext4_release_dquot(struct dquot *dquot)
ac27a0ec
DK		 4565{
4566 int ret, err;
4567 handle_t *handle;
4568
617ba13b 4569 handle = ext4_journal_start(dquot_to_inode(dquot),
0b8e58a1 4570 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
9c3013e9
JK		 4571 if (IS_ERR(handle)) {
4572 /* Release dquot anyway to avoid endless cycle in dqput() */
4573 dquot_release(dquot);
ac27a0ec 4574 return PTR_ERR(handle);
9c3013e9 4575 }
ac27a0ec 4576 ret = dquot_release(dquot);
617ba13b 4577 err = ext4_journal_stop(handle);
ac27a0ec
DK		 4578 if (!ret)
4579 ret = err;
4580 return ret;
4581}
4582
617ba13b 4583static int ext4_mark_dquot_dirty(struct dquot *dquot)
ac27a0ec 4584{
2c8be6b2 4585 /* Are we journaling quotas? */
617ba13b
MC		 4586 if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
4587 EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
ac27a0ec 4588 dquot_mark_dquot_dirty(dquot);
617ba13b 4589 return ext4_write_dquot(dquot);
ac27a0ec
DK		 4590 } else {
4591 return dquot_mark_dquot_dirty(dquot);
4592 }
4593}
4594
617ba13b 4595static int ext4_write_info(struct super_block *sb, int type)
ac27a0ec
DK		 4596{
4597 int ret, err;
4598 handle_t *handle;
4599
4600 /* Data block + inode block */
617ba13b 4601 handle = ext4_journal_start(sb->s_root->d_inode, 2);
ac27a0ec
DK		 4602 if (IS_ERR(handle))
4603 return PTR_ERR(handle);
4604 ret = dquot_commit_info(sb, type);
617ba13b 4605 err = ext4_journal_stop(handle);
ac27a0ec
DK		 4606 if (!ret)
4607 ret = err;
4608 return ret;
4609}
4610
4611/*
4612 * Turn on quotas during mount time - we need to find
4613 * the quota file and such...
4614 */
617ba13b 4615static int ext4_quota_on_mount(struct super_block *sb, int type)
ac27a0ec 4616{
287a8095
CH		 4617 return dquot_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
4618 EXT4_SB(sb)->s_jquota_fmt, type);
ac27a0ec
DK		 4619}
4620
4621/*
4622 * Standard function to be called on quota_on
4623 */
617ba13b 4624static int ext4_quota_on(struct super_block *sb, int type, int format_id,
f00c9e44 4625 struct path *path)
ac27a0ec
DK		 4626{
4627 int err;
ac27a0ec
DK		 4628
4629 if (!test_opt(sb, QUOTA))
4630 return -EINVAL;
0623543b 4631
ac27a0ec 4632 /* Quotafile not on the same filesystem? */
d8c9584e 4633 if (path->dentry->d_sb != sb)
ac27a0ec 4634 return -EXDEV;
0623543b
JK		 4635 /* Journaling quota? */
4636 if (EXT4_SB(sb)->s_qf_names[type]) {
2b2d6d01 4637 /* Quotafile not in fs root? */
f00c9e44 4638 if (path->dentry->d_parent != sb->s_root)
b31e1552
ES		 4639 ext4_msg(sb, KERN_WARNING,
4640 "Quota file not on filesystem root. "
4641 "Journaled quota will not work");
2b2d6d01 4642 }
0623543b
JK		 4643
4644 /*
4645 * When we journal data on quota file, we have to flush journal to see
4646 * all updates to the file when we bypass pagecache...
4647 */
0390131b 4648 if (EXT4_SB(sb)->s_journal &&
f00c9e44 4649 ext4_should_journal_data(path->dentry->d_inode)) {
0623543b
JK		 4650 /*
4651 * We don't need to lock updates but journal_flush() could
4652 * otherwise be livelocked...
4653 */
4654 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
7ffe1ea8 4655 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
0623543b 4656 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
f00c9e44 4657 if (err)
7ffe1ea8 4658 return err;
0623543b
JK		 4659 }
4660
f00c9e44 4661 return dquot_quota_on(sb, type, format_id, path);
ac27a0ec
DK		 4662}
4663
ca0e05e4
DM		 4664static int ext4_quota_off(struct super_block *sb, int type)
4665{
21f97697
JK		 4666 struct inode *inode = sb_dqopt(sb)->files[type];
4667 handle_t *handle;
4668
87009d86
DM		 4669 /* Force all delayed allocation blocks to be allocated.
4670 * Caller already holds s_umount sem */
4671 if (test_opt(sb, DELALLOC))
ca0e05e4 4672 sync_filesystem(sb);
ca0e05e4 4673
0b268590
AG		 4674 if (!inode)
4675 goto out;
4676
21f97697
JK		 4677 /* Update modification times of quota files when userspace can
4678 * start looking at them */
4679 handle = ext4_journal_start(inode, 1);
4680 if (IS_ERR(handle))
4681 goto out;
4682 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
4683 ext4_mark_inode_dirty(handle, inode);
4684 ext4_journal_stop(handle);
4685
4686out:
ca0e05e4
DM		 4687 return dquot_quota_off(sb, type);
4688}
4689
ac27a0ec
DK		 4690/* Read data from quotafile - avoid pagecache and such because we cannot afford
4691 * acquiring the locks... As quota files are never truncated and quota code
25985edc 4692 * itself serializes the operations (and no one else should touch the files)
ac27a0ec 4693 * we don't have to be afraid of races */
617ba13b 4694static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec
DK		 4695 size_t len, loff_t off)
4696{
4697 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 4698 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 4699 int err = 0;
4700 int offset = off & (sb->s_blocksize - 1);
4701 int tocopy;
4702 size_t toread;
4703 struct buffer_head *bh;
4704 loff_t i_size = i_size_read(inode);
4705
4706 if (off > i_size)
4707 return 0;
4708 if (off+len > i_size)
4709 len = i_size-off;
4710 toread = len;
4711 while (toread > 0) {
4712 tocopy = sb->s_blocksize - offset < toread ?
4713 sb->s_blocksize - offset : toread;
617ba13b 4714 bh = ext4_bread(NULL, inode, blk, 0, &err);
ac27a0ec
DK		 4715 if (err)
4716 return err;
4717 if (!bh) /* A hole? */
4718 memset(data, 0, tocopy);
4719 else
4720 memcpy(data, bh->b_data+offset, tocopy);
4721 brelse(bh);
4722 offset = 0;
4723 toread -= tocopy;
4724 data += tocopy;
4725 blk++;
4726 }
4727 return len;
4728}
4729
4730/* Write to quotafile (we know the transaction is already started and has
4731 * enough credits) */
617ba13b 4732static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec
DK		 4733 const char *data, size_t len, loff_t off)
4734{
4735 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 4736 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 4737 int err = 0;
4738 int offset = off & (sb->s_blocksize - 1);
ac27a0ec
DK		 4739 struct buffer_head *bh;
4740 handle_t *handle = journal_current_handle();
4741
0390131b 4742 if (EXT4_SB(sb)->s_journal && !handle) {
b31e1552
ES		 4743 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
4744 " cancelled because transaction is not started",
9c3013e9
JK		 4745 (unsigned long long)off, (unsigned long long)len);
4746 return -EIO;
4747 }
67eeb568
DM		 4748 /*
4749 * Since we account only one data block in transaction credits,
4750 * then it is impossible to cross a block boundary.
4751 */
4752 if (sb->s_blocksize - offset < len) {
4753 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
4754 " cancelled because not block aligned",
4755 (unsigned long long)off, (unsigned long long)len);
4756 return -EIO;
4757 }
4758
ac27a0ec 4759 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
67eeb568
DM		 4760 bh = ext4_bread(handle, inode, blk, 1, &err);
4761 if (!bh)
4762 goto out;
62d2b5f2
JK		 4763 err = ext4_journal_get_write_access(handle, bh);
4764 if (err) {
4765 brelse(bh);
4766 goto out;
ac27a0ec 4767 }
67eeb568
DM		 4768 lock_buffer(bh);
4769 memcpy(bh->b_data+offset, data, len);
4770 flush_dcache_page(bh->b_page);
4771 unlock_buffer(bh);
62d2b5f2 4772 err = ext4_handle_dirty_metadata(handle, NULL, bh);
67eeb568 4773 brelse(bh);
ac27a0ec 4774out:
67eeb568 4775 if (err) {
4d04e4fb 4776 mutex_unlock(&inode->i_mutex);
ac27a0ec 4777 return err;
4d04e4fb 4778 }
67eeb568
DM		 4779 if (inode->i_size < off + len) {
4780 i_size_write(inode, off + len);
617ba13b 4781 EXT4_I(inode)->i_disksize = inode->i_size;
21f97697 4782 ext4_mark_inode_dirty(handle, inode);
ac27a0ec 4783 }
ac27a0ec 4784 mutex_unlock(&inode->i_mutex);
67eeb568 4785 return len;
ac27a0ec
DK		 4786}
4787
4788#endif
4789
152a0836
AV		 4790static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
4791 const char *dev_name, void *data)
ac27a0ec 4792{
152a0836 4793 return mount_bdev(fs_type, flags, dev_name, data, ext4_fill_super);
ac27a0ec
DK		 4794}
4795
37f328eb 4796#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
24b58424
TT		 4797static inline void register_as_ext2(void)
4798{
4799 int err = register_filesystem(&ext2_fs_type);
4800 if (err)
4801 printk(KERN_WARNING
4802 "EXT4-fs: Unable to register as ext2 (%d)\n", err);
4803}
4804
4805static inline void unregister_as_ext2(void)
4806{
4807 unregister_filesystem(&ext2_fs_type);
4808}
2035e776
TT		 4809
4810static inline int ext2_feature_set_ok(struct super_block *sb)
4811{
4812 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP))
4813 return 0;
4814 if (sb->s_flags & MS_RDONLY)
4815 return 1;
4816 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))
4817 return 0;
4818 return 1;
4819}
51b7e3c9 4820MODULE_ALIAS("ext2");
24b58424
TT		 4821#else
4822static inline void register_as_ext2(void) { }
4823static inline void unregister_as_ext2(void) { }
2035e776 4824static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; }
24b58424
TT		 4825#endif
4826
37f328eb 4827#if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
24b58424
TT		 4828static inline void register_as_ext3(void)
4829{
4830 int err = register_filesystem(&ext3_fs_type);
4831 if (err)
4832 printk(KERN_WARNING
4833 "EXT4-fs: Unable to register as ext3 (%d)\n", err);
4834}
4835
4836static inline void unregister_as_ext3(void)
4837{
4838 unregister_filesystem(&ext3_fs_type);
4839}
2035e776
TT		 4840
4841static inline int ext3_feature_set_ok(struct super_block *sb)
4842{
4843 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP))
4844 return 0;
4845 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
4846 return 0;
4847 if (sb->s_flags & MS_RDONLY)
4848 return 1;
4849 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP))
4850 return 0;
4851 return 1;
4852}
51b7e3c9 4853MODULE_ALIAS("ext3");
24b58424
TT		 4854#else
4855static inline void register_as_ext3(void) { }
4856static inline void unregister_as_ext3(void) { }
2035e776 4857static inline int ext3_feature_set_ok(struct super_block *sb) { return 0; }
24b58424
TT		 4858#endif
4859
03010a33
TT		 4860static struct file_system_type ext4_fs_type = {
4861 .owner = THIS_MODULE,
4862 .name = "ext4",
152a0836 4863 .mount = ext4_mount,
03010a33
TT		 4864 .kill_sb = kill_block_super,
4865 .fs_flags = FS_REQUIRES_DEV,
4866};
4867
8f021222 4868static int __init ext4_init_feat_adverts(void)
857ac889
LC		 4869{
4870 struct ext4_features *ef;
4871 int ret = -ENOMEM;
4872
4873 ef = kzalloc(sizeof(struct ext4_features), GFP_KERNEL);
4874 if (!ef)
4875 goto out;
4876
4877 ef->f_kobj.kset = ext4_kset;
4878 init_completion(&ef->f_kobj_unregister);
4879 ret = kobject_init_and_add(&ef->f_kobj, &ext4_feat_ktype, NULL,
4880 "features");
4881 if (ret) {
4882 kfree(ef);
4883 goto out;
4884 }
4885
4886 ext4_feat = ef;
4887 ret = 0;
4888out:
4889 return ret;
4890}
4891
8f021222
LC		 4892static void ext4_exit_feat_adverts(void)
4893{
4894 kobject_put(&ext4_feat->f_kobj);
4895 wait_for_completion(&ext4_feat->f_kobj_unregister);
4896 kfree(ext4_feat);
4897}
4898
e9e3bcec
ES		 4899/* Shared across all ext4 file systems */
4900wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
4901struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ];
4902
5dabfc78 4903static int __init ext4_init_fs(void)
ac27a0ec 4904{
e9e3bcec 4905 int i, err;
c9de560d 4906
12e9b892 4907 ext4_check_flag_values();
e9e3bcec
ES		 4908
4909 for (i = 0; i < EXT4_WQ_HASH_SZ; i++) {
4910 mutex_init(&ext4__aio_mutex[i]);
4911 init_waitqueue_head(&ext4__ioend_wq[i]);
4912 }
4913
5dabfc78 4914 err = ext4_init_pageio();
6fd058f7
TT		 4915 if (err)
4916 return err;
5dabfc78 4917 err = ext4_init_system_zone();
bd2d0210 4918 if (err)
d44651d0 4919 goto out6;
3197ebdb
TT		 4920 ext4_kset = kset_create_and_add("ext4", NULL, fs_kobj);
4921 if (!ext4_kset)
dd68314c 4922 goto out5;
d44651d0 4923 ext4_proc_root = proc_mkdir("fs/ext4", NULL);
857ac889
LC		 4924
4925 err = ext4_init_feat_adverts();
dd68314c
TT		 4926 if (err)
4927 goto out4;
857ac889 4928
5dabfc78 4929 err = ext4_init_mballoc();
ac27a0ec 4930 if (err)
6fd058f7 4931 goto out3;
c9de560d 4932
5dabfc78 4933 err = ext4_init_xattr();
c9de560d
AT		 4934 if (err)
4935 goto out2;
ac27a0ec
DK		 4936 err = init_inodecache();
4937 if (err)
4938 goto out1;
24b58424 4939 register_as_ext3();
2035e776 4940 register_as_ext2();
03010a33 4941 err = register_filesystem(&ext4_fs_type);
ac27a0ec
DK		 4942 if (err)
4943 goto out;
bfff6873
LC		 4944
4945 ext4_li_info = NULL;
4946 mutex_init(&ext4_li_mtx);
ac27a0ec
DK		 4947 return 0;
4948out:
24b58424
TT		 4949 unregister_as_ext2();
4950 unregister_as_ext3();
ac27a0ec
DK		 4951 destroy_inodecache();
4952out1:
5dabfc78 4953 ext4_exit_xattr();
c9de560d 4954out2:
5dabfc78 4955 ext4_exit_mballoc();
6fd058f7 4956out3:
8f021222 4957 ext4_exit_feat_adverts();
dd68314c 4958out4:
d44651d0
FJ		 4959 if (ext4_proc_root)
4960 remove_proc_entry("fs/ext4", NULL);
6fd058f7 4961 kset_unregister(ext4_kset);
d44651d0 4962out5:
5dabfc78 4963 ext4_exit_system_zone();
d44651d0 4964out6:
5dabfc78 4965 ext4_exit_pageio();
ac27a0ec
DK		 4966 return err;
4967}
4968
5dabfc78 4969static void __exit ext4_exit_fs(void)
ac27a0ec 4970{
bfff6873 4971 ext4_destroy_lazyinit_thread();
24b58424
TT		 4972 unregister_as_ext2();
4973 unregister_as_ext3();
03010a33 4974 unregister_filesystem(&ext4_fs_type);
ac27a0ec 4975 destroy_inodecache();
5dabfc78
TT		 4976 ext4_exit_xattr();
4977 ext4_exit_mballoc();
8f021222 4978 ext4_exit_feat_adverts();
9f6200bb 4979 remove_proc_entry("fs/ext4", NULL);
3197ebdb 4980 kset_unregister(ext4_kset);
5dabfc78
TT		 4981 ext4_exit_system_zone();
4982 ext4_exit_pageio();
ac27a0ec
DK		 4983}
4984
4985MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
83982b6f 4986MODULE_DESCRIPTION("Fourth Extended Filesystem");
ac27a0ec 4987MODULE_LICENSE("GPL");
5dabfc78
TT		 4988module_init(ext4_init_fs)
4989module_exit(ext4_exit_fs)
Linux kernel - Deliverables
This page took 0.858108 seconds and 5 git commands to generate.