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ext4: avoid divide by zero when trying to mount a corrupted file system
[linux-2.6/mini2440.git] / fs / ext4 / super.c
blobbc9e02a3609d989b9167f4a95d44ac3f571c3691
1 /*
2 * linux/fs/ext4/super.c
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>
23 #include <linux/vmalloc.h>
24 #include <linux/jbd2.h>
25 #include <linux/slab.h>
26 #include <linux/init.h>
27 #include <linux/blkdev.h>
28 #include <linux/parser.h>
29 #include <linux/smp_lock.h>
30 #include <linux/buffer_head.h>
31 #include <linux/exportfs.h>
32 #include <linux/vfs.h>
33 #include <linux/random.h>
34 #include <linux/mount.h>
35 #include <linux/namei.h>
36 #include <linux/quotaops.h>
37 #include <linux/seq_file.h>
38 #include <linux/proc_fs.h>
39 #include <linux/ctype.h>
40 #include <linux/log2.h>
41 #include <linux/crc16.h>
42 #include <asm/uaccess.h>
43
44 #include "ext4.h"
45 #include "ext4_jbd2.h"
46 #include "xattr.h"
47 #include "acl.h"
48 #include "mballoc.h"
49
50 #define CREATE_TRACE_POINTS
51 #include <trace/events/ext4.h>
52
53 static int default_mb_history_length = 1000;
54
55 module_param_named(default_mb_history_length, default_mb_history_length,
56 int, 0644);
57 MODULE_PARM_DESC(default_mb_history_length,
58 "Default number of entries saved for mb_history");
59
60 struct proc_dir_entry *ext4_proc_root;
61 static struct kset *ext4_kset;
62
63 static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
64 unsigned long journal_devnum);
65 static int ext4_commit_super(struct super_block *sb, int sync);
66 static void ext4_mark_recovery_complete(struct super_block *sb,
67 struct ext4_super_block *es);
68 static void ext4_clear_journal_err(struct super_block *sb,
69 struct ext4_super_block *es);
70 static int ext4_sync_fs(struct super_block *sb, int wait);
71 static const char *ext4_decode_error(struct super_block *sb, int errno,
72 char nbuf[16]);
73 static int ext4_remount(struct super_block *sb, int *flags, char *data);
74 static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
75 static int ext4_unfreeze(struct super_block *sb);
76 static void ext4_write_super(struct super_block *sb);
77 static int ext4_freeze(struct super_block *sb);
78
79
80 ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
81 struct ext4_group_desc *bg)
82 {
83 return le32_to_cpu(bg->bg_block_bitmap_lo) |
84 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
85 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
86 }
87
88 ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
89 struct ext4_group_desc *bg)
90 {
91 return le32_to_cpu(bg->bg_inode_bitmap_lo) |
92 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
93 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
94 }
95
96 ext4_fsblk_t ext4_inode_table(struct super_block *sb,
97 struct ext4_group_desc *bg)
98 {
99 return le32_to_cpu(bg->bg_inode_table_lo) |
100 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
101 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
102 }
103
104 __u32 ext4_free_blks_count(struct super_block *sb,
105 struct ext4_group_desc *bg)
106 {
107 return le16_to_cpu(bg->bg_free_blocks_count_lo) |
108 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
109 (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0);
110 }
111
112 __u32 ext4_free_inodes_count(struct super_block *sb,
113 struct ext4_group_desc *bg)
114 {
115 return le16_to_cpu(bg->bg_free_inodes_count_lo) |
116 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
117 (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0);
118 }
119
120 __u32 ext4_used_dirs_count(struct super_block *sb,
121 struct ext4_group_desc *bg)
122 {
123 return le16_to_cpu(bg->bg_used_dirs_count_lo) |
124 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
125 (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0);
126 }
127
128 __u32 ext4_itable_unused_count(struct super_block *sb,
129 struct ext4_group_desc *bg)
130 {
131 return le16_to_cpu(bg->bg_itable_unused_lo) |
132 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
133 (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0);
134 }
135
136 void ext4_block_bitmap_set(struct super_block *sb,
137 struct ext4_group_desc *bg, ext4_fsblk_t blk)
138 {
139 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
140 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
141 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
142 }
143
144 void ext4_inode_bitmap_set(struct super_block *sb,
145 struct ext4_group_desc *bg, ext4_fsblk_t blk)
146 {
147 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk);
148 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
149 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
150 }
151
152 void ext4_inode_table_set(struct super_block *sb,
153 struct ext4_group_desc *bg, ext4_fsblk_t blk)
154 {
155 bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
156 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
157 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
158 }
159
160 void ext4_free_blks_set(struct super_block *sb,
161 struct ext4_group_desc *bg, __u32 count)
162 {
163 bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count);
164 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
165 bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16);
166 }
167
168 void ext4_free_inodes_set(struct super_block *sb,
169 struct ext4_group_desc *bg, __u32 count)
170 {
171 bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count);
172 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
173 bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16);
174 }
175
176 void ext4_used_dirs_set(struct super_block *sb,
177 struct ext4_group_desc *bg, __u32 count)
178 {
179 bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count);
180 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
181 bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16);
182 }
183
184 void ext4_itable_unused_set(struct super_block *sb,
185 struct ext4_group_desc *bg, __u32 count)
186 {
187 bg->bg_itable_unused_lo = cpu_to_le16((__u16)count);
188 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
189 bg->bg_itable_unused_hi = cpu_to_le16(count >> 16);
190 }
191
192
193 /* Just increment the non-pointer handle value */
194 static handle_t *ext4_get_nojournal(void)
195 {
196 handle_t *handle = current->journal_info;
197 unsigned long ref_cnt = (unsigned long)handle;
198
199 BUG_ON(ref_cnt >= EXT4_NOJOURNAL_MAX_REF_COUNT);
200
201 ref_cnt++;
202 handle = (handle_t *)ref_cnt;
203
204 current->journal_info = handle;
205 return handle;
206 }
207
208
209 /* Decrement the non-pointer handle value */
210 static void ext4_put_nojournal(handle_t *handle)
211 {
212 unsigned long ref_cnt = (unsigned long)handle;
213
214 BUG_ON(ref_cnt == 0);
215
216 ref_cnt--;
217 handle = (handle_t *)ref_cnt;
218
219 current->journal_info = handle;
220 }
221
222 /*
223 * Wrappers for jbd2_journal_start/end.
224 *
225 * The only special thing we need to do here is to make sure that all
226 * journal_end calls result in the superblock being marked dirty, so
227 * that sync() will call the filesystem's write_super callback if
228 * appropriate.
229 */
230 handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks)
231 {
232 journal_t *journal;
233
234 if (sb->s_flags & MS_RDONLY)
235 return ERR_PTR(-EROFS);
236
237 /* Special case here: if the journal has aborted behind our
238 * backs (eg. EIO in the commit thread), then we still need to
239 * take the FS itself readonly cleanly. */
240 journal = EXT4_SB(sb)->s_journal;
241 if (journal) {
242 if (is_journal_aborted(journal)) {
243 ext4_abort(sb, __func__, "Detected aborted journal");
244 return ERR_PTR(-EROFS);
245 }
246 return jbd2_journal_start(journal, nblocks);
247 }
248 return ext4_get_nojournal();
249 }
250
251 /*
252 * The only special thing we need to do here is to make sure that all
253 * jbd2_journal_stop calls result in the superblock being marked dirty, so
254 * that sync() will call the filesystem's write_super callback if
255 * appropriate.
256 */
257 int __ext4_journal_stop(const char *where, handle_t *handle)
258 {
259 struct super_block *sb;
260 int err;
261 int rc;
262
263 if (!ext4_handle_valid(handle)) {
264 ext4_put_nojournal(handle);
265 return 0;
266 }
267 sb = handle->h_transaction->t_journal->j_private;
268 err = handle->h_err;
269 rc = jbd2_journal_stop(handle);
270
271 if (!err)
272 err = rc;
273 if (err)
274 __ext4_std_error(sb, where, err);
275 return err;
276 }
277
278 void ext4_journal_abort_handle(const char *caller, const char *err_fn,
279 struct buffer_head *bh, handle_t *handle, int err)
280 {
281 char nbuf[16];
282 const char *errstr = ext4_decode_error(NULL, err, nbuf);
283
284 BUG_ON(!ext4_handle_valid(handle));
285
286 if (bh)
287 BUFFER_TRACE(bh, "abort");
288
289 if (!handle->h_err)
290 handle->h_err = err;
291
292 if (is_handle_aborted(handle))
293 return;
294
295 printk(KERN_ERR "%s: aborting transaction: %s in %s\n",
296 caller, errstr, err_fn);
297
298 jbd2_journal_abort_handle(handle);
299 }
300
301 /* Deal with the reporting of failure conditions on a filesystem such as
302 * inconsistencies detected or read IO failures.
303 *
304 * On ext2, we can store the error state of the filesystem in the
305 * superblock. That is not possible on ext4, because we may have other
306 * write ordering constraints on the superblock which prevent us from
307 * writing it out straight away; and given that the journal is about to
308 * be aborted, we can't rely on the current, or future, transactions to
309 * write out the superblock safely.
310 *
311 * We'll just use the jbd2_journal_abort() error code to record an error in
312 * the journal instead. On recovery, the journal will compain about
313 * that error until we've noted it down and cleared it.
314 */
315
316 static void ext4_handle_error(struct super_block *sb)
317 {
318 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
319
320 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
321 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
322
323 if (sb->s_flags & MS_RDONLY)
324 return;
325
326 if (!test_opt(sb, ERRORS_CONT)) {
327 journal_t *journal = EXT4_SB(sb)->s_journal;
328
329 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
330 if (journal)
331 jbd2_journal_abort(journal, -EIO);
332 }
333 if (test_opt(sb, ERRORS_RO)) {
334 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
335 sb->s_flags |= MS_RDONLY;
336 }
337 ext4_commit_super(sb, 1);
338 if (test_opt(sb, ERRORS_PANIC))
339 panic("EXT4-fs (device %s): panic forced after error\n",
340 sb->s_id);
341 }
342
343 void ext4_error(struct super_block *sb, const char *function,
344 const char *fmt, ...)
345 {
346 va_list args;
347
348 va_start(args, fmt);
349 printk(KERN_CRIT "EXT4-fs error (device %s): %s: ", sb->s_id, function);
350 vprintk(fmt, args);
351 printk("\n");
352 va_end(args);
353
354 ext4_handle_error(sb);
355 }
356
357 static const char *ext4_decode_error(struct super_block *sb, int errno,
358 char nbuf[16])
359 {
360 char *errstr = NULL;
361
362 switch (errno) {
363 case -EIO:
364 errstr = "IO failure";
365 break;
366 case -ENOMEM:
367 errstr = "Out of memory";
368 break;
369 case -EROFS:
370 if (!sb || (EXT4_SB(sb)->s_journal &&
371 EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT))
372 errstr = "Journal has aborted";
373 else
374 errstr = "Readonly filesystem";
375 break;
376 default:
377 /* If the caller passed in an extra buffer for unknown
378 * errors, textualise them now. Else we just return
379 * NULL. */
380 if (nbuf) {
381 /* Check for truncated error codes... */
382 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
383 errstr = nbuf;
384 }
385 break;
386 }
387
388 return errstr;
389 }
390
391 /* __ext4_std_error decodes expected errors from journaling functions
392 * automatically and invokes the appropriate error response. */
393
394 void __ext4_std_error(struct super_block *sb, const char *function, int errno)
395 {
396 char nbuf[16];
397 const char *errstr;
398
399 /* Special case: if the error is EROFS, and we're not already
400 * inside a transaction, then there's really no point in logging
401 * an error. */
402 if (errno == -EROFS && journal_current_handle() == NULL &&
403 (sb->s_flags & MS_RDONLY))
404 return;
405
406 errstr = ext4_decode_error(sb, errno, nbuf);
407 printk(KERN_CRIT "EXT4-fs error (device %s) in %s: %s\n",
408 sb->s_id, function, errstr);
409
410 ext4_handle_error(sb);
411 }
412
413 /*
414 * ext4_abort is a much stronger failure handler than ext4_error. The
415 * abort function may be used to deal with unrecoverable failures such
416 * as journal IO errors or ENOMEM at a critical moment in log management.
417 *
418 * We unconditionally force the filesystem into an ABORT|READONLY state,
419 * unless the error response on the fs has been set to panic in which
420 * case we take the easy way out and panic immediately.
421 */
422
423 void ext4_abort(struct super_block *sb, const char *function,
424 const char *fmt, ...)
425 {
426 va_list args;
427
428 va_start(args, fmt);
429 printk(KERN_CRIT "EXT4-fs error (device %s): %s: ", sb->s_id, function);
430 vprintk(fmt, args);
431 printk("\n");
432 va_end(args);
433
434 if (test_opt(sb, ERRORS_PANIC))
435 panic("EXT4-fs panic from previous error\n");
436
437 if (sb->s_flags & MS_RDONLY)
438 return;
439
440 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
441 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
442 sb->s_flags |= MS_RDONLY;
443 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
444 if (EXT4_SB(sb)->s_journal)
445 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
446 }
447
448 void ext4_msg (struct super_block * sb, const char *prefix,
449 const char *fmt, ...)
450 {
451 va_list args;
452
453 va_start(args, fmt);
454 printk("%sEXT4-fs (%s): ", prefix, sb->s_id);
455 vprintk(fmt, args);
456 printk("\n");
457 va_end(args);
458 }
459
460 void ext4_warning(struct super_block *sb, const char *function,
461 const char *fmt, ...)
462 {
463 va_list args;
464
465 va_start(args, fmt);
466 printk(KERN_WARNING "EXT4-fs warning (device %s): %s: ",
467 sb->s_id, function);
468 vprintk(fmt, args);
469 printk("\n");
470 va_end(args);
471 }
472
473 void ext4_grp_locked_error(struct super_block *sb, ext4_group_t grp,
474 const char *function, const char *fmt, ...)
475 __releases(bitlock)
476 __acquires(bitlock)
477 {
478 va_list args;
479 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
480
481 va_start(args, fmt);
482 printk(KERN_CRIT "EXT4-fs error (device %s): %s: ", sb->s_id, function);
483 vprintk(fmt, args);
484 printk("\n");
485 va_end(args);
486
487 if (test_opt(sb, ERRORS_CONT)) {
488 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
489 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
490 ext4_commit_super(sb, 0);
491 return;
492 }
493 ext4_unlock_group(sb, grp);
494 ext4_handle_error(sb);
495 /*
496 * We only get here in the ERRORS_RO case; relocking the group
497 * may be dangerous, but nothing bad will happen since the
498 * filesystem will have already been marked read/only and the
499 * journal has been aborted. We return 1 as a hint to callers
500 * who might what to use the return value from
501 * ext4_grp_locked_error() to distinguish beween the
502 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
503 * aggressively from the ext4 function in question, with a
504 * more appropriate error code.
505 */
506 ext4_lock_group(sb, grp);
507 return;
508 }
509
510 void ext4_update_dynamic_rev(struct super_block *sb)
511 {
512 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
513
514 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
515 return;
516
517 ext4_warning(sb, __func__,
518 "updating to rev %d because of new feature flag, "
519 "running e2fsck is recommended",
520 EXT4_DYNAMIC_REV);
521
522 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
523 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
524 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
525 /* leave es->s_feature_*compat flags alone */
526 /* es->s_uuid will be set by e2fsck if empty */
527
528 /*
529 * The rest of the superblock fields should be zero, and if not it
530 * means they are likely already in use, so leave them alone. We
531 * can leave it up to e2fsck to clean up any inconsistencies there.
532 */
533 }
534
535 /*
536 * Open the external journal device
537 */
538 static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb)
539 {
540 struct block_device *bdev;
541 char b[BDEVNAME_SIZE];
542
543 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
544 if (IS_ERR(bdev))
545 goto fail;
546 return bdev;
547
548 fail:
549 ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld",
550 __bdevname(dev, b), PTR_ERR(bdev));
551 return NULL;
552 }
553
554 /*
555 * Release the journal device
556 */
557 static int ext4_blkdev_put(struct block_device *bdev)
558 {
559 bd_release(bdev);
560 return blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
561 }
562
563 static int ext4_blkdev_remove(struct ext4_sb_info *sbi)
564 {
565 struct block_device *bdev;
566 int ret = -ENODEV;
567
568 bdev = sbi->journal_bdev;
569 if (bdev) {
570 ret = ext4_blkdev_put(bdev);
571 sbi->journal_bdev = NULL;
572 }
573 return ret;
574 }
575
576 static inline struct inode *orphan_list_entry(struct list_head *l)
577 {
578 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
579 }
580
581 static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
582 {
583 struct list_head *l;
584
585 ext4_msg(sb, KERN_ERR, "sb orphan head is %d",
586 le32_to_cpu(sbi->s_es->s_last_orphan));
587
588 printk(KERN_ERR "sb_info orphan list:\n");
589 list_for_each(l, &sbi->s_orphan) {
590 struct inode *inode = orphan_list_entry(l);
591 printk(KERN_ERR " "
592 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
593 inode->i_sb->s_id, inode->i_ino, inode,
594 inode->i_mode, inode->i_nlink,
595 NEXT_ORPHAN(inode));
596 }
597 }
598
599 static void ext4_put_super(struct super_block *sb)
600 {
601 struct ext4_sb_info *sbi = EXT4_SB(sb);
602 struct ext4_super_block *es = sbi->s_es;
603 int i, err;
604
605 flush_workqueue(sbi->dio_unwritten_wq);
606 destroy_workqueue(sbi->dio_unwritten_wq);
607
608 lock_super(sb);
609 lock_kernel();
610 if (sb->s_dirt)
611 ext4_commit_super(sb, 1);
612
613 ext4_release_system_zone(sb);
614 ext4_mb_release(sb);
615 ext4_ext_release(sb);
616 ext4_xattr_put_super(sb);
617 if (sbi->s_journal) {
618 err = jbd2_journal_destroy(sbi->s_journal);
619 sbi->s_journal = NULL;
620 if (err < 0)
621 ext4_abort(sb, __func__,
622 "Couldn't clean up the journal");
623 }
624 if (!(sb->s_flags & MS_RDONLY)) {
625 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
626 es->s_state = cpu_to_le16(sbi->s_mount_state);
627 ext4_commit_super(sb, 1);
628 }
629 if (sbi->s_proc) {
630 remove_proc_entry(sb->s_id, ext4_proc_root);
631 }
632 kobject_del(&sbi->s_kobj);
633
634 for (i = 0; i < sbi->s_gdb_count; i++)
635 brelse(sbi->s_group_desc[i]);
636 kfree(sbi->s_group_desc);
637 if (is_vmalloc_addr(sbi->s_flex_groups))
638 vfree(sbi->s_flex_groups);
639 else
640 kfree(sbi->s_flex_groups);
641 percpu_counter_destroy(&sbi->s_freeblocks_counter);
642 percpu_counter_destroy(&sbi->s_freeinodes_counter);
643 percpu_counter_destroy(&sbi->s_dirs_counter);
644 percpu_counter_destroy(&sbi->s_dirtyblocks_counter);
645 brelse(sbi->s_sbh);
646 #ifdef CONFIG_QUOTA
647 for (i = 0; i < MAXQUOTAS; i++)
648 kfree(sbi->s_qf_names[i]);
649 #endif
650
651 /* Debugging code just in case the in-memory inode orphan list
652 * isn't empty. The on-disk one can be non-empty if we've
653 * detected an error and taken the fs readonly, but the
654 * in-memory list had better be clean by this point. */
655 if (!list_empty(&sbi->s_orphan))
656 dump_orphan_list(sb, sbi);
657 J_ASSERT(list_empty(&sbi->s_orphan));
658
659 invalidate_bdev(sb->s_bdev);
660 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
661 /*
662 * Invalidate the journal device's buffers. We don't want them
663 * floating about in memory - the physical journal device may
664 * hotswapped, and it breaks the `ro-after' testing code.
665 */
666 sync_blockdev(sbi->journal_bdev);
667 invalidate_bdev(sbi->journal_bdev);
668 ext4_blkdev_remove(sbi);
669 }
670 sb->s_fs_info = NULL;
671 /*
672 * Now that we are completely done shutting down the
673 * superblock, we need to actually destroy the kobject.
674 */
675 unlock_kernel();
676 unlock_super(sb);
677 kobject_put(&sbi->s_kobj);
678 wait_for_completion(&sbi->s_kobj_unregister);
679 kfree(sbi->s_blockgroup_lock);
680 kfree(sbi);
681 }
682
683 static struct kmem_cache *ext4_inode_cachep;
684
685 /*
686 * Called inside transaction, so use GFP_NOFS
687 */
688 static struct inode *ext4_alloc_inode(struct super_block *sb)
689 {
690 struct ext4_inode_info *ei;
691
692 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
693 if (!ei)
694 return NULL;
695
696 ei->vfs_inode.i_version = 1;
697 ei->vfs_inode.i_data.writeback_index = 0;
698 memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache));
699 INIT_LIST_HEAD(&ei->i_prealloc_list);
700 spin_lock_init(&ei->i_prealloc_lock);
701 /*
702 * Note: We can be called before EXT4_SB(sb)->s_journal is set,
703 * therefore it can be null here. Don't check it, just initialize
704 * jinode.
705 */
706 jbd2_journal_init_jbd_inode(&ei->jinode, &ei->vfs_inode);
707 ei->i_reserved_data_blocks = 0;
708 ei->i_reserved_meta_blocks = 0;
709 ei->i_allocated_meta_blocks = 0;
710 ei->i_delalloc_reserved_flag = 0;
711 spin_lock_init(&(ei->i_block_reservation_lock));
712 INIT_LIST_HEAD(&ei->i_aio_dio_complete_list);
713 ei->cur_aio_dio = NULL;
714
715 return &ei->vfs_inode;
716 }
717
718 static void ext4_destroy_inode(struct inode *inode)
719 {
720 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
721 ext4_msg(inode->i_sb, KERN_ERR,
722 "Inode %lu (%p): orphan list check failed!",
723 inode->i_ino, EXT4_I(inode));
724 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
725 EXT4_I(inode), sizeof(struct ext4_inode_info),
726 true);
727 dump_stack();
728 }
729 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
730 }
731
732 static void init_once(void *foo)
733 {
734 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
735
736 INIT_LIST_HEAD(&ei->i_orphan);
737 #ifdef CONFIG_EXT4_FS_XATTR
738 init_rwsem(&ei->xattr_sem);
739 #endif
740 init_rwsem(&ei->i_data_sem);
741 inode_init_once(&ei->vfs_inode);
742 }
743
744 static int init_inodecache(void)
745 {
746 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
747 sizeof(struct ext4_inode_info),
748 0, (SLAB_RECLAIM_ACCOUNT|
749 SLAB_MEM_SPREAD),
750 init_once);
751 if (ext4_inode_cachep == NULL)
752 return -ENOMEM;
753 return 0;
754 }
755
756 static void destroy_inodecache(void)
757 {
758 kmem_cache_destroy(ext4_inode_cachep);
759 }
760
761 static void ext4_clear_inode(struct inode *inode)
762 {
763 ext4_discard_preallocations(inode);
764 if (EXT4_JOURNAL(inode))
765 jbd2_journal_release_jbd_inode(EXT4_SB(inode->i_sb)->s_journal,
766 &EXT4_I(inode)->jinode);
767 }
768
769 static inline void ext4_show_quota_options(struct seq_file *seq,
770 struct super_block *sb)
771 {
772 #if defined(CONFIG_QUOTA)
773 struct ext4_sb_info *sbi = EXT4_SB(sb);
774
775 if (sbi->s_jquota_fmt)
776 seq_printf(seq, ",jqfmt=%s",
777 (sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold" : "vfsv0");
778
779 if (sbi->s_qf_names[USRQUOTA])
780 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
781
782 if (sbi->s_qf_names[GRPQUOTA])
783 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
784
785 if (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA)
786 seq_puts(seq, ",usrquota");
787
788 if (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)
789 seq_puts(seq, ",grpquota");
790 #endif
791 }
792
793 /*
794 * Show an option if
795 * - it's set to a non-default value OR
796 * - if the per-sb default is different from the global default
797 */
798 static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs)
799 {
800 int def_errors;
801 unsigned long def_mount_opts;
802 struct super_block *sb = vfs->mnt_sb;
803 struct ext4_sb_info *sbi = EXT4_SB(sb);
804 struct ext4_super_block *es = sbi->s_es;
805
806 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
807 def_errors = le16_to_cpu(es->s_errors);
808
809 if (sbi->s_sb_block != 1)
810 seq_printf(seq, ",sb=%llu", sbi->s_sb_block);
811 if (test_opt(sb, MINIX_DF))
812 seq_puts(seq, ",minixdf");
813 if (test_opt(sb, GRPID) && !(def_mount_opts & EXT4_DEFM_BSDGROUPS))
814 seq_puts(seq, ",grpid");
815 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT4_DEFM_BSDGROUPS))
816 seq_puts(seq, ",nogrpid");
817 if (sbi->s_resuid != EXT4_DEF_RESUID ||
818 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID) {
819 seq_printf(seq, ",resuid=%u", sbi->s_resuid);
820 }
821 if (sbi->s_resgid != EXT4_DEF_RESGID ||
822 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID) {
823 seq_printf(seq, ",resgid=%u", sbi->s_resgid);
824 }
825 if (test_opt(sb, ERRORS_RO)) {
826 if (def_errors == EXT4_ERRORS_PANIC ||
827 def_errors == EXT4_ERRORS_CONTINUE) {
828 seq_puts(seq, ",errors=remount-ro");
829 }
830 }
831 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
832 seq_puts(seq, ",errors=continue");
833 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
834 seq_puts(seq, ",errors=panic");
835 if (test_opt(sb, NO_UID32) && !(def_mount_opts & EXT4_DEFM_UID16))
836 seq_puts(seq, ",nouid32");
837 if (test_opt(sb, DEBUG) && !(def_mount_opts & EXT4_DEFM_DEBUG))
838 seq_puts(seq, ",debug");
839 if (test_opt(sb, OLDALLOC))
840 seq_puts(seq, ",oldalloc");
841 #ifdef CONFIG_EXT4_FS_XATTR
842 if (test_opt(sb, XATTR_USER) &&
843 !(def_mount_opts & EXT4_DEFM_XATTR_USER))
844 seq_puts(seq, ",user_xattr");
845 if (!test_opt(sb, XATTR_USER) &&
846 (def_mount_opts & EXT4_DEFM_XATTR_USER)) {
847 seq_puts(seq, ",nouser_xattr");
848 }
849 #endif
850 #ifdef CONFIG_EXT4_FS_POSIX_ACL
851 if (test_opt(sb, POSIX_ACL) && !(def_mount_opts & EXT4_DEFM_ACL))
852 seq_puts(seq, ",acl");
853 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT4_DEFM_ACL))
854 seq_puts(seq, ",noacl");
855 #endif
856 if (sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) {
857 seq_printf(seq, ",commit=%u",
858 (unsigned) (sbi->s_commit_interval / HZ));
859 }
860 if (sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME) {
861 seq_printf(seq, ",min_batch_time=%u",
862 (unsigned) sbi->s_min_batch_time);
863 }
864 if (sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME) {
865 seq_printf(seq, ",max_batch_time=%u",
866 (unsigned) sbi->s_min_batch_time);
867 }
868
869 /*
870 * We're changing the default of barrier mount option, so
871 * let's always display its mount state so it's clear what its
872 * status is.
873 */
874 seq_puts(seq, ",barrier=");
875 seq_puts(seq, test_opt(sb, BARRIER) ? "1" : "0");
876 if (test_opt(sb, JOURNAL_ASYNC_COMMIT))
877 seq_puts(seq, ",journal_async_commit");
878 if (test_opt(sb, NOBH))
879 seq_puts(seq, ",nobh");
880 if (test_opt(sb, I_VERSION))
881 seq_puts(seq, ",i_version");
882 if (!test_opt(sb, DELALLOC))
883 seq_puts(seq, ",nodelalloc");
884
885
886 if (sbi->s_stripe)
887 seq_printf(seq, ",stripe=%lu", sbi->s_stripe);
888 /*
889 * journal mode get enabled in different ways
890 * So just print the value even if we didn't specify it
891 */
892 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
893 seq_puts(seq, ",data=journal");
894 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
895 seq_puts(seq, ",data=ordered");
896 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
897 seq_puts(seq, ",data=writeback");
898
899 if (sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
900 seq_printf(seq, ",inode_readahead_blks=%u",
901 sbi->s_inode_readahead_blks);
902
903 if (test_opt(sb, DATA_ERR_ABORT))
904 seq_puts(seq, ",data_err=abort");
905
906 if (test_opt(sb, NO_AUTO_DA_ALLOC))
907 seq_puts(seq, ",noauto_da_alloc");
908
909 ext4_show_quota_options(seq, sb);
910
911 return 0;
912 }
913
914 static struct inode *ext4_nfs_get_inode(struct super_block *sb,
915 u64 ino, u32 generation)
916 {
917 struct inode *inode;
918
919 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
920 return ERR_PTR(-ESTALE);
921 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
922 return ERR_PTR(-ESTALE);
923
924 /* iget isn't really right if the inode is currently unallocated!!
925 *
926 * ext4_read_inode will return a bad_inode if the inode had been
927 * deleted, so we should be safe.
928 *
929 * Currently we don't know the generation for parent directory, so
930 * a generation of 0 means "accept any"
931 */
932 inode = ext4_iget(sb, ino);
933 if (IS_ERR(inode))
934 return ERR_CAST(inode);
935 if (generation && inode->i_generation != generation) {
936 iput(inode);
937 return ERR_PTR(-ESTALE);
938 }
939
940 return inode;
941 }
942
943 static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
944 int fh_len, int fh_type)
945 {
946 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
947 ext4_nfs_get_inode);
948 }
949
950 static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
951 int fh_len, int fh_type)
952 {
953 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
954 ext4_nfs_get_inode);
955 }
956
957 /*
958 * Try to release metadata pages (indirect blocks, directories) which are
959 * mapped via the block device. Since these pages could have journal heads
960 * which would prevent try_to_free_buffers() from freeing them, we must use
961 * jbd2 layer's try_to_free_buffers() function to release them.
962 */
963 static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
964 gfp_t wait)
965 {
966 journal_t *journal = EXT4_SB(sb)->s_journal;
967
968 WARN_ON(PageChecked(page));
969 if (!page_has_buffers(page))
970 return 0;
971 if (journal)
972 return jbd2_journal_try_to_free_buffers(journal, page,
973 wait & ~__GFP_WAIT);
974 return try_to_free_buffers(page);
975 }
976
977 #ifdef CONFIG_QUOTA
978 #define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
979 #define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
980
981 static int ext4_write_dquot(struct dquot *dquot);
982 static int ext4_acquire_dquot(struct dquot *dquot);
983 static int ext4_release_dquot(struct dquot *dquot);
984 static int ext4_mark_dquot_dirty(struct dquot *dquot);
985 static int ext4_write_info(struct super_block *sb, int type);
986 static int ext4_quota_on(struct super_block *sb, int type, int format_id,
987 char *path, int remount);
988 static int ext4_quota_on_mount(struct super_block *sb, int type);
989 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
990 size_t len, loff_t off);
991 static ssize_t ext4_quota_write(struct super_block *sb, int type,
992 const char *data, size_t len, loff_t off);
993
994 static struct dquot_operations ext4_quota_operations = {
995 .initialize = dquot_initialize,
996 .drop = dquot_drop,
997 .alloc_space = dquot_alloc_space,
998 .reserve_space = dquot_reserve_space,
999 .claim_space = dquot_claim_space,
1000 .release_rsv = dquot_release_reserved_space,
1001 .get_reserved_space = ext4_get_reserved_space,
1002 .alloc_inode = dquot_alloc_inode,
1003 .free_space = dquot_free_space,
1004 .free_inode = dquot_free_inode,
1005 .transfer = dquot_transfer,
1006 .write_dquot = ext4_write_dquot,
1007 .acquire_dquot = ext4_acquire_dquot,
1008 .release_dquot = ext4_release_dquot,
1009 .mark_dirty = ext4_mark_dquot_dirty,
1010 .write_info = ext4_write_info,
1011 .alloc_dquot = dquot_alloc,
1012 .destroy_dquot = dquot_destroy,
1013 };
1014
1015 static struct quotactl_ops ext4_qctl_operations = {
1016 .quota_on = ext4_quota_on,
1017 .quota_off = vfs_quota_off,
1018 .quota_sync = vfs_quota_sync,
1019 .get_info = vfs_get_dqinfo,
1020 .set_info = vfs_set_dqinfo,
1021 .get_dqblk = vfs_get_dqblk,
1022 .set_dqblk = vfs_set_dqblk
1023 };
1024 #endif
1025
1026 static const struct super_operations ext4_sops = {
1027 .alloc_inode = ext4_alloc_inode,
1028 .destroy_inode = ext4_destroy_inode,
1029 .write_inode = ext4_write_inode,
1030 .dirty_inode = ext4_dirty_inode,
1031 .delete_inode = ext4_delete_inode,
1032 .put_super = ext4_put_super,
1033 .sync_fs = ext4_sync_fs,
1034 .freeze_fs = ext4_freeze,
1035 .unfreeze_fs = ext4_unfreeze,
1036 .statfs = ext4_statfs,
1037 .remount_fs = ext4_remount,
1038 .clear_inode = ext4_clear_inode,
1039 .show_options = ext4_show_options,
1040 #ifdef CONFIG_QUOTA
1041 .quota_read = ext4_quota_read,
1042 .quota_write = ext4_quota_write,
1043 #endif
1044 .bdev_try_to_free_page = bdev_try_to_free_page,
1045 };
1046
1047 static const struct super_operations ext4_nojournal_sops = {
1048 .alloc_inode = ext4_alloc_inode,
1049 .destroy_inode = ext4_destroy_inode,
1050 .write_inode = ext4_write_inode,
1051 .dirty_inode = ext4_dirty_inode,
1052 .delete_inode = ext4_delete_inode,
1053 .write_super = ext4_write_super,
1054 .put_super = ext4_put_super,
1055 .statfs = ext4_statfs,
1056 .remount_fs = ext4_remount,
1057 .clear_inode = ext4_clear_inode,
1058 .show_options = ext4_show_options,
1059 #ifdef CONFIG_QUOTA
1060 .quota_read = ext4_quota_read,
1061 .quota_write = ext4_quota_write,
1062 #endif
1063 .bdev_try_to_free_page = bdev_try_to_free_page,
1064 };
1065
1066 static const struct export_operations ext4_export_ops = {
1067 .fh_to_dentry = ext4_fh_to_dentry,
1068 .fh_to_parent = ext4_fh_to_parent,
1069 .get_parent = ext4_get_parent,
1070 };
1071
1072 enum {
1073 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
1074 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
1075 Opt_nouid32, Opt_debug, Opt_oldalloc, Opt_orlov,
1076 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
1077 Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload, Opt_nobh, Opt_bh,
1078 Opt_commit, Opt_min_batch_time, Opt_max_batch_time,
1079 Opt_journal_update, Opt_journal_dev,
1080 Opt_journal_checksum, Opt_journal_async_commit,
1081 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
1082 Opt_data_err_abort, Opt_data_err_ignore, Opt_mb_history_length,
1083 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
1084 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota,
1085 Opt_ignore, Opt_barrier, Opt_nobarrier, Opt_err, Opt_resize,
1086 Opt_usrquota, Opt_grpquota, Opt_i_version,
1087 Opt_stripe, Opt_delalloc, Opt_nodelalloc,
1088 Opt_block_validity, Opt_noblock_validity,
1089 Opt_inode_readahead_blks, Opt_journal_ioprio
1090 };
1091
1092 static const match_table_t tokens = {
1093 {Opt_bsd_df, "bsddf"},
1094 {Opt_minix_df, "minixdf"},
1095 {Opt_grpid, "grpid"},
1096 {Opt_grpid, "bsdgroups"},
1097 {Opt_nogrpid, "nogrpid"},
1098 {Opt_nogrpid, "sysvgroups"},
1099 {Opt_resgid, "resgid=%u"},
1100 {Opt_resuid, "resuid=%u"},
1101 {Opt_sb, "sb=%u"},
1102 {Opt_err_cont, "errors=continue"},
1103 {Opt_err_panic, "errors=panic"},
1104 {Opt_err_ro, "errors=remount-ro"},
1105 {Opt_nouid32, "nouid32"},
1106 {Opt_debug, "debug"},
1107 {Opt_oldalloc, "oldalloc"},
1108 {Opt_orlov, "orlov"},
1109 {Opt_user_xattr, "user_xattr"},
1110 {Opt_nouser_xattr, "nouser_xattr"},
1111 {Opt_acl, "acl"},
1112 {Opt_noacl, "noacl"},
1113 {Opt_noload, "noload"},
1114 {Opt_nobh, "nobh"},
1115 {Opt_bh, "bh"},
1116 {Opt_commit, "commit=%u"},
1117 {Opt_min_batch_time, "min_batch_time=%u"},
1118 {Opt_max_batch_time, "max_batch_time=%u"},
1119 {Opt_journal_update, "journal=update"},
1120 {Opt_journal_dev, "journal_dev=%u"},
1121 {Opt_journal_checksum, "journal_checksum"},
1122 {Opt_journal_async_commit, "journal_async_commit"},
1123 {Opt_abort, "abort"},
1124 {Opt_data_journal, "data=journal"},
1125 {Opt_data_ordered, "data=ordered"},
1126 {Opt_data_writeback, "data=writeback"},
1127 {Opt_data_err_abort, "data_err=abort"},
1128 {Opt_data_err_ignore, "data_err=ignore"},
1129 {Opt_mb_history_length, "mb_history_length=%u"},
1130 {Opt_offusrjquota, "usrjquota="},
1131 {Opt_usrjquota, "usrjquota=%s"},
1132 {Opt_offgrpjquota, "grpjquota="},
1133 {Opt_grpjquota, "grpjquota=%s"},
1134 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
1135 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
1136 {Opt_grpquota, "grpquota"},
1137 {Opt_noquota, "noquota"},
1138 {Opt_quota, "quota"},
1139 {Opt_usrquota, "usrquota"},
1140 {Opt_barrier, "barrier=%u"},
1141 {Opt_barrier, "barrier"},
1142 {Opt_nobarrier, "nobarrier"},
1143 {Opt_i_version, "i_version"},
1144 {Opt_stripe, "stripe=%u"},
1145 {Opt_resize, "resize"},
1146 {Opt_delalloc, "delalloc"},
1147 {Opt_nodelalloc, "nodelalloc"},
1148 {Opt_block_validity, "block_validity"},
1149 {Opt_noblock_validity, "noblock_validity"},
1150 {Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
1151 {Opt_journal_ioprio, "journal_ioprio=%u"},
1152 {Opt_auto_da_alloc, "auto_da_alloc=%u"},
1153 {Opt_auto_da_alloc, "auto_da_alloc"},
1154 {Opt_noauto_da_alloc, "noauto_da_alloc"},
1155 {Opt_err, NULL},
1156 };
1157
1158 static ext4_fsblk_t get_sb_block(void **data)
1159 {
1160 ext4_fsblk_t sb_block;
1161 char *options = (char *) *data;
1162
1163 if (!options || strncmp(options, "sb=", 3) != 0)
1164 return 1; /* Default location */
1165
1166 options += 3;
1167 /* TODO: use simple_strtoll with >32bit ext4 */
1168 sb_block = simple_strtoul(options, &options, 0);
1169 if (*options && *options != ',') {
1170 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
1171 (char *) *data);
1172 return 1;
1173 }
1174 if (*options == ',')
1175 options++;
1176 *data = (void *) options;
1177
1178 return sb_block;
1179 }
1180
1181 #define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
1182
1183 static int parse_options(char *options, struct super_block *sb,
1184 unsigned long *journal_devnum,
1185 unsigned int *journal_ioprio,
1186 ext4_fsblk_t *n_blocks_count, int is_remount)
1187 {
1188 struct ext4_sb_info *sbi = EXT4_SB(sb);
1189 char *p;
1190 substring_t args[MAX_OPT_ARGS];
1191 int data_opt = 0;
1192 int option;
1193 #ifdef CONFIG_QUOTA
1194 int qtype, qfmt;
1195 char *qname;
1196 #endif
1197
1198 if (!options)
1199 return 1;
1200
1201 while ((p = strsep(&options, ",")) != NULL) {
1202 int token;
1203 if (!*p)
1204 continue;
1205
1206 token = match_token(p, tokens, args);
1207 switch (token) {
1208 case Opt_bsd_df:
1209 clear_opt(sbi->s_mount_opt, MINIX_DF);
1210 break;
1211 case Opt_minix_df:
1212 set_opt(sbi->s_mount_opt, MINIX_DF);
1213 break;
1214 case Opt_grpid:
1215 set_opt(sbi->s_mount_opt, GRPID);
1216 break;
1217 case Opt_nogrpid:
1218 clear_opt(sbi->s_mount_opt, GRPID);
1219 break;
1220 case Opt_resuid:
1221 if (match_int(&args[0], &option))
1222 return 0;
1223 sbi->s_resuid = option;
1224 break;
1225 case Opt_resgid:
1226 if (match_int(&args[0], &option))
1227 return 0;
1228 sbi->s_resgid = option;
1229 break;
1230 case Opt_sb:
1231 /* handled by get_sb_block() instead of here */
1232 /* *sb_block = match_int(&args[0]); */
1233 break;
1234 case Opt_err_panic:
1235 clear_opt(sbi->s_mount_opt, ERRORS_CONT);
1236 clear_opt(sbi->s_mount_opt, ERRORS_RO);
1237 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1238 break;
1239 case Opt_err_ro:
1240 clear_opt(sbi->s_mount_opt, ERRORS_CONT);
1241 clear_opt(sbi->s_mount_opt, ERRORS_PANIC);
1242 set_opt(sbi->s_mount_opt, ERRORS_RO);
1243 break;
1244 case Opt_err_cont:
1245 clear_opt(sbi->s_mount_opt, ERRORS_RO);
1246 clear_opt(sbi->s_mount_opt, ERRORS_PANIC);
1247 set_opt(sbi->s_mount_opt, ERRORS_CONT);
1248 break;
1249 case Opt_nouid32:
1250 set_opt(sbi->s_mount_opt, NO_UID32);
1251 break;
1252 case Opt_debug:
1253 set_opt(sbi->s_mount_opt, DEBUG);
1254 break;
1255 case Opt_oldalloc:
1256 set_opt(sbi->s_mount_opt, OLDALLOC);
1257 break;
1258 case Opt_orlov:
1259 clear_opt(sbi->s_mount_opt, OLDALLOC);
1260 break;
1261 #ifdef CONFIG_EXT4_FS_XATTR
1262 case Opt_user_xattr:
1263 set_opt(sbi->s_mount_opt, XATTR_USER);
1264 break;
1265 case Opt_nouser_xattr:
1266 clear_opt(sbi->s_mount_opt, XATTR_USER);
1267 break;
1268 #else
1269 case Opt_user_xattr:
1270 case Opt_nouser_xattr:
1271 ext4_msg(sb, KERN_ERR, "(no)user_xattr options not supported");
1272 break;
1273 #endif
1274 #ifdef CONFIG_EXT4_FS_POSIX_ACL
1275 case Opt_acl:
1276 set_opt(sbi->s_mount_opt, POSIX_ACL);
1277 break;
1278 case Opt_noacl:
1279 clear_opt(sbi->s_mount_opt, POSIX_ACL);
1280 break;
1281 #else
1282 case Opt_acl:
1283 case Opt_noacl:
1284 ext4_msg(sb, KERN_ERR, "(no)acl options not supported");
1285 break;
1286 #endif
1287 case Opt_journal_update:
1288 /* @@@ FIXME */
1289 /* Eventually we will want to be able to create
1290 a journal file here. For now, only allow the
1291 user to specify an existing inode to be the
1292 journal file. */
1293 if (is_remount) {
1294 ext4_msg(sb, KERN_ERR,
1295 "Cannot specify journal on remount");
1296 return 0;
1297 }
1298 set_opt(sbi->s_mount_opt, UPDATE_JOURNAL);
1299 break;
1300 case Opt_journal_dev:
1301 if (is_remount) {
1302 ext4_msg(sb, KERN_ERR,
1303 "Cannot specify journal on remount");
1304 return 0;
1305 }
1306 if (match_int(&args[0], &option))
1307 return 0;
1308 *journal_devnum = option;
1309 break;
1310 case Opt_journal_checksum:
1311 set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM);
1312 break;
1313 case Opt_journal_async_commit:
1314 set_opt(sbi->s_mount_opt, JOURNAL_ASYNC_COMMIT);
1315 set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM);
1316 break;
1317 case Opt_noload:
1318 set_opt(sbi->s_mount_opt, NOLOAD);
1319 break;
1320 case Opt_commit:
1321 if (match_int(&args[0], &option))
1322 return 0;
1323 if (option < 0)
1324 return 0;
1325 if (option == 0)
1326 option = JBD2_DEFAULT_MAX_COMMIT_AGE;
1327 sbi->s_commit_interval = HZ * option;
1328 break;
1329 case Opt_max_batch_time:
1330 if (match_int(&args[0], &option))
1331 return 0;
1332 if (option < 0)
1333 return 0;
1334 if (option == 0)
1335 option = EXT4_DEF_MAX_BATCH_TIME;
1336 sbi->s_max_batch_time = option;
1337 break;
1338 case Opt_min_batch_time:
1339 if (match_int(&args[0], &option))
1340 return 0;
1341 if (option < 0)
1342 return 0;
1343 sbi->s_min_batch_time = option;
1344 break;
1345 case Opt_data_journal:
1346 data_opt = EXT4_MOUNT_JOURNAL_DATA;
1347 goto datacheck;
1348 case Opt_data_ordered:
1349 data_opt = EXT4_MOUNT_ORDERED_DATA;
1350 goto datacheck;
1351 case Opt_data_writeback:
1352 data_opt = EXT4_MOUNT_WRITEBACK_DATA;
1353 datacheck:
1354 if (is_remount) {
1355 if ((sbi->s_mount_opt & EXT4_MOUNT_DATA_FLAGS)
1356 != data_opt) {
1357 ext4_msg(sb, KERN_ERR,
1358 "Cannot change data mode on remount");
1359 return 0;
1360 }
1361 } else {
1362 sbi->s_mount_opt &= ~EXT4_MOUNT_DATA_FLAGS;
1363 sbi->s_mount_opt |= data_opt;
1364 }
1365 break;
1366 case Opt_data_err_abort:
1367 set_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1368 break;
1369 case Opt_data_err_ignore:
1370 clear_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1371 break;
1372 case Opt_mb_history_length:
1373 if (match_int(&args[0], &option))
1374 return 0;
1375 if (option < 0)
1376 return 0;
1377 sbi->s_mb_history_max = option;
1378 break;
1379 #ifdef CONFIG_QUOTA
1380 case Opt_usrjquota:
1381 qtype = USRQUOTA;
1382 goto set_qf_name;
1383 case Opt_grpjquota:
1384 qtype = GRPQUOTA;
1385 set_qf_name:
1386 if (sb_any_quota_loaded(sb) &&
1387 !sbi->s_qf_names[qtype]) {
1388 ext4_msg(sb, KERN_ERR,
1389 "Cannot change journaled "
1390 "quota options when quota turned on");
1391 return 0;
1392 }
1393 qname = match_strdup(&args[0]);
1394 if (!qname) {
1395 ext4_msg(sb, KERN_ERR,
1396 "Not enough memory for "
1397 "storing quotafile name");
1398 return 0;
1399 }
1400 if (sbi->s_qf_names[qtype] &&
1401 strcmp(sbi->s_qf_names[qtype], qname)) {
1402 ext4_msg(sb, KERN_ERR,
1403 "%s quota file already "
1404 "specified", QTYPE2NAME(qtype));
1405 kfree(qname);
1406 return 0;
1407 }
1408 sbi->s_qf_names[qtype] = qname;
1409 if (strchr(sbi->s_qf_names[qtype], '/')) {
1410 ext4_msg(sb, KERN_ERR,
1411 "quotafile must be on "
1412 "filesystem root");
1413 kfree(sbi->s_qf_names[qtype]);
1414 sbi->s_qf_names[qtype] = NULL;
1415 return 0;
1416 }
1417 set_opt(sbi->s_mount_opt, QUOTA);
1418 break;
1419 case Opt_offusrjquota:
1420 qtype = USRQUOTA;
1421 goto clear_qf_name;
1422 case Opt_offgrpjquota:
1423 qtype = GRPQUOTA;
1424 clear_qf_name:
1425 if (sb_any_quota_loaded(sb) &&
1426 sbi->s_qf_names[qtype]) {
1427 ext4_msg(sb, KERN_ERR, "Cannot change "
1428 "journaled quota options when "
1429 "quota turned on");
1430 return 0;
1431 }
1432 /*
1433 * The space will be released later when all options
1434 * are confirmed to be correct
1435 */
1436 sbi->s_qf_names[qtype] = NULL;
1437 break;
1438 case Opt_jqfmt_vfsold:
1439 qfmt = QFMT_VFS_OLD;
1440 goto set_qf_format;
1441 case Opt_jqfmt_vfsv0:
1442 qfmt = QFMT_VFS_V0;
1443 set_qf_format:
1444 if (sb_any_quota_loaded(sb) &&
1445 sbi->s_jquota_fmt != qfmt) {
1446 ext4_msg(sb, KERN_ERR, "Cannot change "
1447 "journaled quota options when "
1448 "quota turned on");
1449 return 0;
1450 }
1451 sbi->s_jquota_fmt = qfmt;
1452 break;
1453 case Opt_quota:
1454 case Opt_usrquota:
1455 set_opt(sbi->s_mount_opt, QUOTA);
1456 set_opt(sbi->s_mount_opt, USRQUOTA);
1457 break;
1458 case Opt_grpquota:
1459 set_opt(sbi->s_mount_opt, QUOTA);
1460 set_opt(sbi->s_mount_opt, GRPQUOTA);
1461 break;
1462 case Opt_noquota:
1463 if (sb_any_quota_loaded(sb)) {
1464 ext4_msg(sb, KERN_ERR, "Cannot change quota "
1465 "options when quota turned on");
1466 return 0;
1467 }
1468 clear_opt(sbi->s_mount_opt, QUOTA);
1469 clear_opt(sbi->s_mount_opt, USRQUOTA);
1470 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1471 break;
1472 #else
1473 case Opt_quota:
1474 case Opt_usrquota:
1475 case Opt_grpquota:
1476 ext4_msg(sb, KERN_ERR,
1477 "quota options not supported");
1478 break;
1479 case Opt_usrjquota:
1480 case Opt_grpjquota:
1481 case Opt_offusrjquota:
1482 case Opt_offgrpjquota:
1483 case Opt_jqfmt_vfsold:
1484 case Opt_jqfmt_vfsv0:
1485 ext4_msg(sb, KERN_ERR,
1486 "journaled quota options not supported");
1487 break;
1488 case Opt_noquota:
1489 break;
1490 #endif
1491 case Opt_abort:
1492 sbi->s_mount_flags |= EXT4_MF_FS_ABORTED;
1493 break;
1494 case Opt_nobarrier:
1495 clear_opt(sbi->s_mount_opt, BARRIER);
1496 break;
1497 case Opt_barrier:
1498 if (match_int(&args[0], &option)) {
1499 set_opt(sbi->s_mount_opt, BARRIER);
1500 break;
1501 }
1502 if (option)
1503 set_opt(sbi->s_mount_opt, BARRIER);
1504 else
1505 clear_opt(sbi->s_mount_opt, BARRIER);
1506 break;
1507 case Opt_ignore:
1508 break;
1509 case Opt_resize:
1510 if (!is_remount) {
1511 ext4_msg(sb, KERN_ERR,
1512 "resize option only available "
1513 "for remount");
1514 return 0;
1515 }
1516 if (match_int(&args[0], &option) != 0)
1517 return 0;
1518 *n_blocks_count = option;
1519 break;
1520 case Opt_nobh:
1521 set_opt(sbi->s_mount_opt, NOBH);
1522 break;
1523 case Opt_bh:
1524 clear_opt(sbi->s_mount_opt, NOBH);
1525 break;
1526 case Opt_i_version:
1527 set_opt(sbi->s_mount_opt, I_VERSION);
1528 sb->s_flags |= MS_I_VERSION;
1529 break;
1530 case Opt_nodelalloc:
1531 clear_opt(sbi->s_mount_opt, DELALLOC);
1532 break;
1533 case Opt_stripe:
1534 if (match_int(&args[0], &option))
1535 return 0;
1536 if (option < 0)
1537 return 0;
1538 sbi->s_stripe = option;
1539 break;
1540 case Opt_delalloc:
1541 set_opt(sbi->s_mount_opt, DELALLOC);
1542 break;
1543 case Opt_block_validity:
1544 set_opt(sbi->s_mount_opt, BLOCK_VALIDITY);
1545 break;
1546 case Opt_noblock_validity:
1547 clear_opt(sbi->s_mount_opt, BLOCK_VALIDITY);
1548 break;
1549 case Opt_inode_readahead_blks:
1550 if (match_int(&args[0], &option))
1551 return 0;
1552 if (option < 0 || option > (1 << 30))
1553 return 0;
1554 if (!is_power_of_2(option)) {
1555 ext4_msg(sb, KERN_ERR,
1556 "EXT4-fs: inode_readahead_blks"
1557 " must be a power of 2");
1558 return 0;
1559 }
1560 sbi->s_inode_readahead_blks = option;
1561 break;
1562 case Opt_journal_ioprio:
1563 if (match_int(&args[0], &option))
1564 return 0;
1565 if (option < 0 || option > 7)
1566 break;
1567 *journal_ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE,
1568 option);
1569 break;
1570 case Opt_noauto_da_alloc:
1571 set_opt(sbi->s_mount_opt,NO_AUTO_DA_ALLOC);
1572 break;
1573 case Opt_auto_da_alloc:
1574 if (match_int(&args[0], &option)) {
1575 clear_opt(sbi->s_mount_opt, NO_AUTO_DA_ALLOC);
1576 break;
1577 }
1578 if (option)
1579 clear_opt(sbi->s_mount_opt, NO_AUTO_DA_ALLOC);
1580 else
1581 set_opt(sbi->s_mount_opt,NO_AUTO_DA_ALLOC);
1582 break;
1583 default:
1584 ext4_msg(sb, KERN_ERR,
1585 "Unrecognized mount option \"%s\" "
1586 "or missing value", p);
1587 return 0;
1588 }
1589 }
1590 #ifdef CONFIG_QUOTA
1591 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1592 if ((sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA) &&
1593 sbi->s_qf_names[USRQUOTA])
1594 clear_opt(sbi->s_mount_opt, USRQUOTA);
1595
1596 if ((sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA) &&
1597 sbi->s_qf_names[GRPQUOTA])
1598 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1599
1600 if ((sbi->s_qf_names[USRQUOTA] &&
1601 (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)) ||
1602 (sbi->s_qf_names[GRPQUOTA] &&
1603 (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA))) {
1604 ext4_msg(sb, KERN_ERR, "old and new quota "
1605 "format mixing");
1606 return 0;
1607 }
1608
1609 if (!sbi->s_jquota_fmt) {
1610 ext4_msg(sb, KERN_ERR, "journaled quota format "
1611 "not specified");
1612 return 0;
1613 }
1614 } else {
1615 if (sbi->s_jquota_fmt) {
1616 ext4_msg(sb, KERN_ERR, "journaled quota format "
1617 "specified with no journaling "
1618 "enabled");
1619 return 0;
1620 }
1621 }
1622 #endif
1623 return 1;
1624 }
1625
1626 static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
1627 int read_only)
1628 {
1629 struct ext4_sb_info *sbi = EXT4_SB(sb);
1630 int res = 0;
1631
1632 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
1633 ext4_msg(sb, KERN_ERR, "revision level too high, "
1634 "forcing read-only mode");
1635 res = MS_RDONLY;
1636 }
1637 if (read_only)
1638 return res;
1639 if (!(sbi->s_mount_state & EXT4_VALID_FS))
1640 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
1641 "running e2fsck is recommended");
1642 else if ((sbi->s_mount_state & EXT4_ERROR_FS))
1643 ext4_msg(sb, KERN_WARNING,
1644 "warning: mounting fs with errors, "
1645 "running e2fsck is recommended");
1646 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
1647 le16_to_cpu(es->s_mnt_count) >=
1648 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
1649 ext4_msg(sb, KERN_WARNING,
1650 "warning: maximal mount count reached, "
1651 "running e2fsck is recommended");
1652 else if (le32_to_cpu(es->s_checkinterval) &&
1653 (le32_to_cpu(es->s_lastcheck) +
1654 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1655 ext4_msg(sb, KERN_WARNING,
1656 "warning: checktime reached, "
1657 "running e2fsck is recommended");
1658 if (!sbi->s_journal)
1659 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
1660 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
1661 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
1662 le16_add_cpu(&es->s_mnt_count, 1);
1663 es->s_mtime = cpu_to_le32(get_seconds());
1664 ext4_update_dynamic_rev(sb);
1665 if (sbi->s_journal)
1666 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
1667
1668 ext4_commit_super(sb, 1);
1669 if (test_opt(sb, DEBUG))
1670 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
1671 "bpg=%lu, ipg=%lu, mo=%04x]\n",
1672 sb->s_blocksize,
1673 sbi->s_groups_count,
1674 EXT4_BLOCKS_PER_GROUP(sb),
1675 EXT4_INODES_PER_GROUP(sb),
1676 sbi->s_mount_opt);
1677
1678 if (EXT4_SB(sb)->s_journal) {
1679 ext4_msg(sb, KERN_INFO, "%s journal on %s",
1680 EXT4_SB(sb)->s_journal->j_inode ? "internal" :
1681 "external", EXT4_SB(sb)->s_journal->j_devname);
1682 } else {
1683 ext4_msg(sb, KERN_INFO, "no journal");
1684 }
1685 return res;
1686 }
1687
1688 static int ext4_fill_flex_info(struct super_block *sb)
1689 {
1690 struct ext4_sb_info *sbi = EXT4_SB(sb);
1691 struct ext4_group_desc *gdp = NULL;
1692 ext4_group_t flex_group_count;
1693 ext4_group_t flex_group;
1694 int groups_per_flex = 0;
1695 size_t size;
1696 int i;
1697
1698 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
1699 groups_per_flex = 1 << sbi->s_log_groups_per_flex;
1700
1701 if (groups_per_flex < 2) {
1702 sbi->s_log_groups_per_flex = 0;
1703 return 1;
1704 }
1705
1706 /* We allocate both existing and potentially added groups */
1707 flex_group_count = ((sbi->s_groups_count + groups_per_flex - 1) +
1708 ((le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) + 1) <<
1709 EXT4_DESC_PER_BLOCK_BITS(sb))) / groups_per_flex;
1710 size = flex_group_count * sizeof(struct flex_groups);
1711 sbi->s_flex_groups = kzalloc(size, GFP_KERNEL);
1712 if (sbi->s_flex_groups == NULL) {
1713 sbi->s_flex_groups = vmalloc(size);
1714 if (sbi->s_flex_groups)
1715 memset(sbi->s_flex_groups, 0, size);
1716 }
1717 if (sbi->s_flex_groups == NULL) {
1718 ext4_msg(sb, KERN_ERR, "not enough memory for "
1719 "%u flex groups", flex_group_count);
1720 goto failed;
1721 }
1722
1723 for (i = 0; i < sbi->s_groups_count; i++) {
1724 gdp = ext4_get_group_desc(sb, i, NULL);
1725
1726 flex_group = ext4_flex_group(sbi, i);
1727 atomic_add(ext4_free_inodes_count(sb, gdp),
1728 &sbi->s_flex_groups[flex_group].free_inodes);
1729 atomic_add(ext4_free_blks_count(sb, gdp),
1730 &sbi->s_flex_groups[flex_group].free_blocks);
1731 atomic_add(ext4_used_dirs_count(sb, gdp),
1732 &sbi->s_flex_groups[flex_group].used_dirs);
1733 }
1734
1735 return 1;
1736 failed:
1737 return 0;
1738 }
1739
1740 __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
1741 struct ext4_group_desc *gdp)
1742 {
1743 __u16 crc = 0;
1744
1745 if (sbi->s_es->s_feature_ro_compat &
1746 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) {
1747 int offset = offsetof(struct ext4_group_desc, bg_checksum);
1748 __le32 le_group = cpu_to_le32(block_group);
1749
1750 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
1751 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
1752 crc = crc16(crc, (__u8 *)gdp, offset);
1753 offset += sizeof(gdp->bg_checksum); /* skip checksum */
1754 /* for checksum of struct ext4_group_desc do the rest...*/
1755 if ((sbi->s_es->s_feature_incompat &
1756 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) &&
1757 offset < le16_to_cpu(sbi->s_es->s_desc_size))
1758 crc = crc16(crc, (__u8 *)gdp + offset,
1759 le16_to_cpu(sbi->s_es->s_desc_size) -
1760 offset);
1761 }
1762
1763 return cpu_to_le16(crc);
1764 }
1765
1766 int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 block_group,
1767 struct ext4_group_desc *gdp)
1768 {
1769 if ((sbi->s_es->s_feature_ro_compat &
1770 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) &&
1771 (gdp->bg_checksum != ext4_group_desc_csum(sbi, block_group, gdp)))
1772 return 0;
1773
1774 return 1;
1775 }
1776
1777 /* Called at mount-time, super-block is locked */
1778 static int ext4_check_descriptors(struct super_block *sb)
1779 {
1780 struct ext4_sb_info *sbi = EXT4_SB(sb);
1781 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
1782 ext4_fsblk_t last_block;
1783 ext4_fsblk_t block_bitmap;
1784 ext4_fsblk_t inode_bitmap;
1785 ext4_fsblk_t inode_table;
1786 int flexbg_flag = 0;
1787 ext4_group_t i;
1788
1789 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
1790 flexbg_flag = 1;
1791
1792 ext4_debug("Checking group descriptors");
1793
1794 for (i = 0; i < sbi->s_groups_count; i++) {
1795 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
1796
1797 if (i == sbi->s_groups_count - 1 || flexbg_flag)
1798 last_block = ext4_blocks_count(sbi->s_es) - 1;
1799 else
1800 last_block = first_block +
1801 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
1802
1803 block_bitmap = ext4_block_bitmap(sb, gdp);
1804 if (block_bitmap < first_block || block_bitmap > last_block) {
1805 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
1806 "Block bitmap for group %u not in group "
1807 "(block %llu)!", i, block_bitmap);
1808 return 0;
1809 }
1810 inode_bitmap = ext4_inode_bitmap(sb, gdp);
1811 if (inode_bitmap < first_block || inode_bitmap > last_block) {
1812 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
1813 "Inode bitmap for group %u not in group "
1814 "(block %llu)!", i, inode_bitmap);
1815 return 0;
1816 }
1817 inode_table = ext4_inode_table(sb, gdp);
1818 if (inode_table < first_block ||
1819 inode_table + sbi->s_itb_per_group - 1 > last_block) {
1820 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
1821 "Inode table for group %u not in group "
1822 "(block %llu)!", i, inode_table);
1823 return 0;
1824 }
1825 ext4_lock_group(sb, i);
1826 if (!ext4_group_desc_csum_verify(sbi, i, gdp)) {
1827 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
1828 "Checksum for group %u failed (%u!=%u)",
1829 i, le16_to_cpu(ext4_group_desc_csum(sbi, i,
1830 gdp)), le16_to_cpu(gdp->bg_checksum));
1831 if (!(sb->s_flags & MS_RDONLY)) {
1832 ext4_unlock_group(sb, i);
1833 return 0;
1834 }
1835 }
1836 ext4_unlock_group(sb, i);
1837 if (!flexbg_flag)
1838 first_block += EXT4_BLOCKS_PER_GROUP(sb);
1839 }
1840
1841 ext4_free_blocks_count_set(sbi->s_es, ext4_count_free_blocks(sb));
1842 sbi->s_es->s_free_inodes_count =cpu_to_le32(ext4_count_free_inodes(sb));
1843 return 1;
1844 }
1845
1846 /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
1847 * the superblock) which were deleted from all directories, but held open by
1848 * a process at the time of a crash. We walk the list and try to delete these
1849 * inodes at recovery time (only with a read-write filesystem).
1850 *
1851 * In order to keep the orphan inode chain consistent during traversal (in
1852 * case of crash during recovery), we link each inode into the superblock
1853 * orphan list_head and handle it the same way as an inode deletion during
1854 * normal operation (which journals the operations for us).
1855 *
1856 * We only do an iget() and an iput() on each inode, which is very safe if we
1857 * accidentally point at an in-use or already deleted inode. The worst that
1858 * can happen in this case is that we get a "bit already cleared" message from
1859 * ext4_free_inode(). The only reason we would point at a wrong inode is if
1860 * e2fsck was run on this filesystem, and it must have already done the orphan
1861 * inode cleanup for us, so we can safely abort without any further action.
1862 */
1863 static void ext4_orphan_cleanup(struct super_block *sb,
1864 struct ext4_super_block *es)
1865 {
1866 unsigned int s_flags = sb->s_flags;
1867 int nr_orphans = 0, nr_truncates = 0;
1868 #ifdef CONFIG_QUOTA
1869 int i;
1870 #endif
1871 if (!es->s_last_orphan) {
1872 jbd_debug(4, "no orphan inodes to clean up\n");
1873 return;
1874 }
1875
1876 if (bdev_read_only(sb->s_bdev)) {
1877 ext4_msg(sb, KERN_ERR, "write access "
1878 "unavailable, skipping orphan cleanup");
1879 return;
1880 }
1881
1882 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
1883 if (es->s_last_orphan)
1884 jbd_debug(1, "Errors on filesystem, "
1885 "clearing orphan list.\n");
1886 es->s_last_orphan = 0;
1887 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1888 return;
1889 }
1890
1891 if (s_flags & MS_RDONLY) {
1892 ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
1893 sb->s_flags &= ~MS_RDONLY;
1894 }
1895 #ifdef CONFIG_QUOTA
1896 /* Needed for iput() to work correctly and not trash data */
1897 sb->s_flags |= MS_ACTIVE;
1898 /* Turn on quotas so that they are updated correctly */
1899 for (i = 0; i < MAXQUOTAS; i++) {
1900 if (EXT4_SB(sb)->s_qf_names[i]) {
1901 int ret = ext4_quota_on_mount(sb, i);
1902 if (ret < 0)
1903 ext4_msg(sb, KERN_ERR,
1904 "Cannot turn on journaled "
1905 "quota: error %d", ret);
1906 }
1907 }
1908 #endif
1909
1910 while (es->s_last_orphan) {
1911 struct inode *inode;
1912
1913 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
1914 if (IS_ERR(inode)) {
1915 es->s_last_orphan = 0;
1916 break;
1917 }
1918
1919 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
1920 vfs_dq_init(inode);
1921 if (inode->i_nlink) {
1922 ext4_msg(sb, KERN_DEBUG,
1923 "%s: truncating inode %lu to %lld bytes",
1924 __func__, inode->i_ino, inode->i_size);
1925 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
1926 inode->i_ino, inode->i_size);
1927 ext4_truncate(inode);
1928 nr_truncates++;
1929 } else {
1930 ext4_msg(sb, KERN_DEBUG,
1931 "%s: deleting unreferenced inode %lu",
1932 __func__, inode->i_ino);
1933 jbd_debug(2, "deleting unreferenced inode %lu\n",
1934 inode->i_ino);
1935 nr_orphans++;
1936 }
1937 iput(inode); /* The delete magic happens here! */
1938 }
1939
1940 #define PLURAL(x) (x), ((x) == 1) ? "" : "s"
1941
1942 if (nr_orphans)
1943 ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
1944 PLURAL(nr_orphans));
1945 if (nr_truncates)
1946 ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
1947 PLURAL(nr_truncates));
1948 #ifdef CONFIG_QUOTA
1949 /* Turn quotas off */
1950 for (i = 0; i < MAXQUOTAS; i++) {
1951 if (sb_dqopt(sb)->files[i])
1952 vfs_quota_off(sb, i, 0);
1953 }
1954 #endif
1955 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1956 }
1957
1958 /*
1959 * Maximal extent format file size.
1960 * Resulting logical blkno at s_maxbytes must fit in our on-disk
1961 * extent format containers, within a sector_t, and within i_blocks
1962 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
1963 * so that won't be a limiting factor.
1964 *
1965 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
1966 */
1967 static loff_t ext4_max_size(int blkbits, int has_huge_files)
1968 {
1969 loff_t res;
1970 loff_t upper_limit = MAX_LFS_FILESIZE;
1971
1972 /* small i_blocks in vfs inode? */
1973 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
1974 /*
1975 * CONFIG_LBDAF is not enabled implies the inode
1976 * i_block represent total blocks in 512 bytes
1977 * 32 == size of vfs inode i_blocks * 8
1978 */
1979 upper_limit = (1LL << 32) - 1;
1980
1981 /* total blocks in file system block size */
1982 upper_limit >>= (blkbits - 9);
1983 upper_limit <<= blkbits;
1984 }
1985
1986 /* 32-bit extent-start container, ee_block */
1987 res = 1LL << 32;
1988 res <<= blkbits;
1989 res -= 1;
1990
1991 /* Sanity check against vm- & vfs- imposed limits */
1992 if (res > upper_limit)
1993 res = upper_limit;
1994
1995 return res;
1996 }
1997
1998 /*
1999 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
2000 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2001 * We need to be 1 filesystem block less than the 2^48 sector limit.
2002 */
2003 static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
2004 {
2005 loff_t res = EXT4_NDIR_BLOCKS;
2006 int meta_blocks;
2007 loff_t upper_limit;
2008 /* This is calculated to be the largest file size for a dense, block
2009 * mapped file such that the file's total number of 512-byte sectors,
2010 * including data and all indirect blocks, does not exceed (2^48 - 1).
2011 *
2012 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2013 * number of 512-byte sectors of the file.
2014 */
2015
2016 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
2017 /*
2018 * !has_huge_files or CONFIG_LBDAF not enabled implies that
2019 * the inode i_block field represents total file blocks in
2020 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
2021 */
2022 upper_limit = (1LL << 32) - 1;
2023
2024 /* total blocks in file system block size */
2025 upper_limit >>= (bits - 9);
2026
2027 } else {
2028 /*
2029 * We use 48 bit ext4_inode i_blocks
2030 * With EXT4_HUGE_FILE_FL set the i_blocks
2031 * represent total number of blocks in
2032 * file system block size
2033 */
2034 upper_limit = (1LL << 48) - 1;
2035
2036 }
2037
2038 /* indirect blocks */
2039 meta_blocks = 1;
2040 /* double indirect blocks */
2041 meta_blocks += 1 + (1LL << (bits-2));
2042 /* tripple indirect blocks */
2043 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
2044
2045 upper_limit -= meta_blocks;
2046 upper_limit <<= bits;
2047
2048 res += 1LL << (bits-2);
2049 res += 1LL << (2*(bits-2));
2050 res += 1LL << (3*(bits-2));
2051 res <<= bits;
2052 if (res > upper_limit)
2053 res = upper_limit;
2054
2055 if (res > MAX_LFS_FILESIZE)
2056 res = MAX_LFS_FILESIZE;
2057
2058 return res;
2059 }
2060
2061 static ext4_fsblk_t descriptor_loc(struct super_block *sb,
2062 ext4_fsblk_t logical_sb_block, int nr)
2063 {
2064 struct ext4_sb_info *sbi = EXT4_SB(sb);
2065 ext4_group_t bg, first_meta_bg;
2066 int has_super = 0;
2067
2068 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
2069
2070 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
2071 nr < first_meta_bg)
2072 return logical_sb_block + nr + 1;
2073 bg = sbi->s_desc_per_block * nr;
2074 if (ext4_bg_has_super(sb, bg))
2075 has_super = 1;
2076
2077 return (has_super + ext4_group_first_block_no(sb, bg));
2078 }
2079
2080 /**
2081 * ext4_get_stripe_size: Get the stripe size.
2082 * @sbi: In memory super block info
2083 *
2084 * If we have specified it via mount option, then
2085 * use the mount option value. If the value specified at mount time is
2086 * greater than the blocks per group use the super block value.
2087 * If the super block value is greater than blocks per group return 0.
2088 * Allocator needs it be less than blocks per group.
2089 *
2090 */
2091 static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
2092 {
2093 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
2094 unsigned long stripe_width =
2095 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
2096
2097 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
2098 return sbi->s_stripe;
2099
2100 if (stripe_width <= sbi->s_blocks_per_group)
2101 return stripe_width;
2102
2103 if (stride <= sbi->s_blocks_per_group)
2104 return stride;
2105
2106 return 0;
2107 }
2108
2109 /* sysfs supprt */
2110
2111 struct ext4_attr {
2112 struct attribute attr;
2113 ssize_t (*show)(struct ext4_attr *, struct ext4_sb_info *, char *);
2114 ssize_t (*store)(struct ext4_attr *, struct ext4_sb_info *,
2115 const char *, size_t);
2116 int offset;
2117 };
2118
2119 static int parse_strtoul(const char *buf,
2120 unsigned long max, unsigned long *value)
2121 {
2122 char *endp;
2123
2124 while (*buf && isspace(*buf))
2125 buf++;
2126 *value = simple_strtoul(buf, &endp, 0);
2127 while (*endp && isspace(*endp))
2128 endp++;
2129 if (*endp || *value > max)
2130 return -EINVAL;
2131
2132 return 0;
2133 }
2134
2135 static ssize_t delayed_allocation_blocks_show(struct ext4_attr *a,
2136 struct ext4_sb_info *sbi,
2137 char *buf)
2138 {
2139 return snprintf(buf, PAGE_SIZE, "%llu\n",
2140 (s64) percpu_counter_sum(&sbi->s_dirtyblocks_counter));
2141 }
2142
2143 static ssize_t session_write_kbytes_show(struct ext4_attr *a,
2144 struct ext4_sb_info *sbi, char *buf)
2145 {
2146 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2147
2148 return snprintf(buf, PAGE_SIZE, "%lu\n",
2149 (part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
2150 sbi->s_sectors_written_start) >> 1);
2151 }
2152
2153 static ssize_t lifetime_write_kbytes_show(struct ext4_attr *a,
2154 struct ext4_sb_info *sbi, char *buf)
2155 {
2156 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2157
2158 return snprintf(buf, PAGE_SIZE, "%llu\n",
2159 sbi->s_kbytes_written +
2160 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
2161 EXT4_SB(sb)->s_sectors_written_start) >> 1));
2162 }
2163
2164 static ssize_t inode_readahead_blks_store(struct ext4_attr *a,
2165 struct ext4_sb_info *sbi,
2166 const char *buf, size_t count)
2167 {
2168 unsigned long t;
2169
2170 if (parse_strtoul(buf, 0x40000000, &t))
2171 return -EINVAL;
2172
2173 if (!is_power_of_2(t))
2174 return -EINVAL;
2175
2176 sbi->s_inode_readahead_blks = t;
2177 return count;
2178 }
2179
2180 static ssize_t sbi_ui_show(struct ext4_attr *a,
2181 struct ext4_sb_info *sbi, char *buf)
2182 {
2183 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
2184
2185 return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
2186 }
2187
2188 static ssize_t sbi_ui_store(struct ext4_attr *a,
2189 struct ext4_sb_info *sbi,
2190 const char *buf, size_t count)
2191 {
2192 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
2193 unsigned long t;
2194
2195 if (parse_strtoul(buf, 0xffffffff, &t))
2196 return -EINVAL;
2197 *ui = t;
2198 return count;
2199 }
2200
2201 #define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \
2202 static struct ext4_attr ext4_attr_##_name = { \
2203 .attr = {.name = __stringify(_name), .mode = _mode }, \
2204 .show = _show, \
2205 .store = _store, \
2206 .offset = offsetof(struct ext4_sb_info, _elname), \
2207 }
2208 #define EXT4_ATTR(name, mode, show, store) \
2209 static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store)
2210
2211 #define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL)
2212 #define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store)
2213 #define EXT4_RW_ATTR_SBI_UI(name, elname) \
2214 EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname)
2215 #define ATTR_LIST(name) &ext4_attr_##name.attr
2216
2217 EXT4_RO_ATTR(delayed_allocation_blocks);
2218 EXT4_RO_ATTR(session_write_kbytes);
2219 EXT4_RO_ATTR(lifetime_write_kbytes);
2220 EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, sbi_ui_show,
2221 inode_readahead_blks_store, s_inode_readahead_blks);
2222 EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal);
2223 EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats);
2224 EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan);
2225 EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan);
2226 EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs);
2227 EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request);
2228 EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc);
2229 EXT4_RW_ATTR_SBI_UI(max_writeback_mb_bump, s_max_writeback_mb_bump);
2230
2231 static struct attribute *ext4_attrs[] = {
2232 ATTR_LIST(delayed_allocation_blocks),
2233 ATTR_LIST(session_write_kbytes),
2234 ATTR_LIST(lifetime_write_kbytes),
2235 ATTR_LIST(inode_readahead_blks),
2236 ATTR_LIST(inode_goal),
2237 ATTR_LIST(mb_stats),
2238 ATTR_LIST(mb_max_to_scan),
2239 ATTR_LIST(mb_min_to_scan),
2240 ATTR_LIST(mb_order2_req),
2241 ATTR_LIST(mb_stream_req),
2242 ATTR_LIST(mb_group_prealloc),
2243 ATTR_LIST(max_writeback_mb_bump),
2244 NULL,
2245 };
2246
2247 static ssize_t ext4_attr_show(struct kobject *kobj,
2248 struct attribute *attr, char *buf)
2249 {
2250 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2251 s_kobj);
2252 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2253
2254 return a->show ? a->show(a, sbi, buf) : 0;
2255 }
2256
2257 static ssize_t ext4_attr_store(struct kobject *kobj,
2258 struct attribute *attr,
2259 const char *buf, size_t len)
2260 {
2261 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2262 s_kobj);
2263 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2264
2265 return a->store ? a->store(a, sbi, buf, len) : 0;
2266 }
2267
2268 static void ext4_sb_release(struct kobject *kobj)
2269 {
2270 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2271 s_kobj);
2272 complete(&sbi->s_kobj_unregister);
2273 }
2274
2275
2276 static struct sysfs_ops ext4_attr_ops = {
2277 .show = ext4_attr_show,
2278 .store = ext4_attr_store,
2279 };
2280
2281 static struct kobj_type ext4_ktype = {
2282 .default_attrs = ext4_attrs,
2283 .sysfs_ops = &ext4_attr_ops,
2284 .release = ext4_sb_release,
2285 };
2286
2287 /*
2288 * Check whether this filesystem can be mounted based on
2289 * the features present and the RDONLY/RDWR mount requested.
2290 * Returns 1 if this filesystem can be mounted as requested,
2291 * 0 if it cannot be.
2292 */
2293 static int ext4_feature_set_ok(struct super_block *sb, int readonly)
2294 {
2295 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP)) {
2296 ext4_msg(sb, KERN_ERR,
2297 "Couldn't mount because of "
2298 "unsupported optional features (%x)",
2299 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
2300 ~EXT4_FEATURE_INCOMPAT_SUPP));
2301 return 0;
2302 }
2303
2304 if (readonly)
2305 return 1;
2306
2307 /* Check that feature set is OK for a read-write mount */
2308 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP)) {
2309 ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of "
2310 "unsupported optional features (%x)",
2311 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
2312 ~EXT4_FEATURE_RO_COMPAT_SUPP));
2313 return 0;
2314 }
2315 /*
2316 * Large file size enabled file system can only be mounted
2317 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
2318 */
2319 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) {
2320 if (sizeof(blkcnt_t) < sizeof(u64)) {
2321 ext4_msg(sb, KERN_ERR, "Filesystem with huge files "
2322 "cannot be mounted RDWR without "
2323 "CONFIG_LBDAF");
2324 return 0;
2325 }
2326 }
2327 return 1;
2328 }
2329
2330 static int ext4_fill_super(struct super_block *sb, void *data, int silent)
2331 __releases(kernel_lock)
2332 __acquires(kernel_lock)
2333 {
2334 struct buffer_head *bh;
2335 struct ext4_super_block *es = NULL;
2336 struct ext4_sb_info *sbi;
2337 ext4_fsblk_t block;
2338 ext4_fsblk_t sb_block = get_sb_block(&data);
2339 ext4_fsblk_t logical_sb_block;
2340 unsigned long offset = 0;
2341 unsigned long journal_devnum = 0;
2342 unsigned long def_mount_opts;
2343 struct inode *root;
2344 char *cp;
2345 const char *descr;
2346 int ret = -EINVAL;
2347 int blocksize;
2348 unsigned int db_count;
2349 unsigned int i;
2350 int needs_recovery, has_huge_files;
2351 __u64 blocks_count;
2352 int err;
2353 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
2354
2355 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
2356 if (!sbi)
2357 return -ENOMEM;
2358
2359 sbi->s_blockgroup_lock =
2360 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
2361 if (!sbi->s_blockgroup_lock) {
2362 kfree(sbi);
2363 return -ENOMEM;
2364 }
2365 sb->s_fs_info = sbi;
2366 sbi->s_mount_opt = 0;
2367 sbi->s_resuid = EXT4_DEF_RESUID;
2368 sbi->s_resgid = EXT4_DEF_RESGID;
2369 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
2370 sbi->s_sb_block = sb_block;
2371 sbi->s_sectors_written_start = part_stat_read(sb->s_bdev->bd_part,
2372 sectors[1]);
2373
2374 unlock_kernel();
2375
2376 /* Cleanup superblock name */
2377 for (cp = sb->s_id; (cp = strchr(cp, '/'));)
2378 *cp = '!';
2379
2380 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
2381 if (!blocksize) {
2382 ext4_msg(sb, KERN_ERR, "unable to set blocksize");
2383 goto out_fail;
2384 }
2385
2386 /*
2387 * The ext4 superblock will not be buffer aligned for other than 1kB
2388 * block sizes. We need to calculate the offset from buffer start.
2389 */
2390 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
2391 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
2392 offset = do_div(logical_sb_block, blocksize);
2393 } else {
2394 logical_sb_block = sb_block;
2395 }
2396
2397 if (!(bh = sb_bread(sb, logical_sb_block))) {
2398 ext4_msg(sb, KERN_ERR, "unable to read superblock");
2399 goto out_fail;
2400 }
2401 /*
2402 * Note: s_es must be initialized as soon as possible because
2403 * some ext4 macro-instructions depend on its value
2404 */
2405 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
2406 sbi->s_es = es;
2407 sb->s_magic = le16_to_cpu(es->s_magic);
2408 if (sb->s_magic != EXT4_SUPER_MAGIC)
2409 goto cantfind_ext4;
2410 sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
2411
2412 /* Set defaults before we parse the mount options */
2413 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
2414 if (def_mount_opts & EXT4_DEFM_DEBUG)
2415 set_opt(sbi->s_mount_opt, DEBUG);
2416 if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
2417 set_opt(sbi->s_mount_opt, GRPID);
2418 if (def_mount_opts & EXT4_DEFM_UID16)
2419 set_opt(sbi->s_mount_opt, NO_UID32);
2420 #ifdef CONFIG_EXT4_FS_XATTR
2421 if (def_mount_opts & EXT4_DEFM_XATTR_USER)
2422 set_opt(sbi->s_mount_opt, XATTR_USER);
2423 #endif
2424 #ifdef CONFIG_EXT4_FS_POSIX_ACL
2425 if (def_mount_opts & EXT4_DEFM_ACL)
2426 set_opt(sbi->s_mount_opt, POSIX_ACL);
2427 #endif
2428 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
2429 sbi->s_mount_opt |= EXT4_MOUNT_JOURNAL_DATA;
2430 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
2431 sbi->s_mount_opt |= EXT4_MOUNT_ORDERED_DATA;
2432 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
2433 sbi->s_mount_opt |= EXT4_MOUNT_WRITEBACK_DATA;
2434
2435 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
2436 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
2437 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
2438 set_opt(sbi->s_mount_opt, ERRORS_CONT);
2439 else
2440 set_opt(sbi->s_mount_opt, ERRORS_RO);
2441
2442 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
2443 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
2444 sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
2445 sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
2446 sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
2447 sbi->s_mb_history_max = default_mb_history_length;
2448
2449 set_opt(sbi->s_mount_opt, BARRIER);
2450
2451 /*
2452 * enable delayed allocation by default
2453 * Use -o nodelalloc to turn it off
2454 */
2455 set_opt(sbi->s_mount_opt, DELALLOC);
2456
2457 if (!parse_options((char *) data, sb, &journal_devnum,
2458 &journal_ioprio, NULL, 0))
2459 goto failed_mount;
2460
2461 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
2462 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
2463
2464 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
2465 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
2466 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
2467 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
2468 ext4_msg(sb, KERN_WARNING,
2469 "feature flags set on rev 0 fs, "
2470 "running e2fsck is recommended");
2471
2472 /*
2473 * Check feature flags regardless of the revision level, since we
2474 * previously didn't change the revision level when setting the flags,
2475 * so there is a chance incompat flags are set on a rev 0 filesystem.
2476 */
2477 if (!ext4_feature_set_ok(sb, (sb->s_flags & MS_RDONLY)))
2478 goto failed_mount;
2479
2480 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
2481
2482 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
2483 blocksize > EXT4_MAX_BLOCK_SIZE) {
2484 ext4_msg(sb, KERN_ERR,
2485 "Unsupported filesystem blocksize %d", blocksize);
2486 goto failed_mount;
2487 }
2488
2489 if (sb->s_blocksize != blocksize) {
2490 /* Validate the filesystem blocksize */
2491 if (!sb_set_blocksize(sb, blocksize)) {
2492 ext4_msg(sb, KERN_ERR, "bad block size %d",
2493 blocksize);
2494 goto failed_mount;
2495 }
2496
2497 brelse(bh);
2498 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
2499 offset = do_div(logical_sb_block, blocksize);
2500 bh = sb_bread(sb, logical_sb_block);
2501 if (!bh) {
2502 ext4_msg(sb, KERN_ERR,
2503 "Can't read superblock on 2nd try");
2504 goto failed_mount;
2505 }
2506 es = (struct ext4_super_block *)(((char *)bh->b_data) + offset);
2507 sbi->s_es = es;
2508 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
2509 ext4_msg(sb, KERN_ERR,
2510 "Magic mismatch, very weird!");
2511 goto failed_mount;
2512 }
2513 }
2514
2515 has_huge_files = EXT4_HAS_RO_COMPAT_FEATURE(sb,
2516 EXT4_FEATURE_RO_COMPAT_HUGE_FILE);
2517 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
2518 has_huge_files);
2519 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
2520
2521 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
2522 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
2523 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
2524 } else {
2525 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
2526 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
2527 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
2528 (!is_power_of_2(sbi->s_inode_size)) ||
2529 (sbi->s_inode_size > blocksize)) {
2530 ext4_msg(sb, KERN_ERR,
2531 "unsupported inode size: %d",
2532 sbi->s_inode_size);
2533 goto failed_mount;
2534 }
2535 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
2536 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
2537 }
2538
2539 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
2540 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
2541 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
2542 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
2543 !is_power_of_2(sbi->s_desc_size)) {
2544 ext4_msg(sb, KERN_ERR,
2545 "unsupported descriptor size %lu",
2546 sbi->s_desc_size);
2547 goto failed_mount;
2548 }
2549 } else
2550 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
2551
2552 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
2553 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
2554 if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
2555 goto cantfind_ext4;
2556
2557 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
2558 if (sbi->s_inodes_per_block == 0)
2559 goto cantfind_ext4;
2560 sbi->s_itb_per_group = sbi->s_inodes_per_group /
2561 sbi->s_inodes_per_block;
2562 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
2563 sbi->s_sbh = bh;
2564 sbi->s_mount_state = le16_to_cpu(es->s_state);
2565 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
2566 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
2567
2568 for (i = 0; i < 4; i++)
2569 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
2570 sbi->s_def_hash_version = es->s_def_hash_version;
2571 i = le32_to_cpu(es->s_flags);
2572 if (i & EXT2_FLAGS_UNSIGNED_HASH)
2573 sbi->s_hash_unsigned = 3;
2574 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
2575 #ifdef __CHAR_UNSIGNED__
2576 es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
2577 sbi->s_hash_unsigned = 3;
2578 #else
2579 es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
2580 #endif
2581 sb->s_dirt = 1;
2582 }
2583
2584 if (sbi->s_blocks_per_group > blocksize * 8) {
2585 ext4_msg(sb, KERN_ERR,
2586 "#blocks per group too big: %lu",
2587 sbi->s_blocks_per_group);
2588 goto failed_mount;
2589 }
2590 if (sbi->s_inodes_per_group > blocksize * 8) {
2591 ext4_msg(sb, KERN_ERR,
2592 "#inodes per group too big: %lu",
2593 sbi->s_inodes_per_group);
2594 goto failed_mount;
2595 }
2596
2597 /*
2598 * Test whether we have more sectors than will fit in sector_t,
2599 * and whether the max offset is addressable by the page cache.
2600 */
2601 if ((ext4_blocks_count(es) >
2602 (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) ||
2603 (ext4_blocks_count(es) >
2604 (pgoff_t)(~0ULL) >> (PAGE_CACHE_SHIFT - sb->s_blocksize_bits))) {
2605 ext4_msg(sb, KERN_ERR, "filesystem"
2606 " too large to mount safely on this system");
2607 if (sizeof(sector_t) < 8)
2608 ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled");
2609 ret = -EFBIG;
2610 goto failed_mount;
2611 }
2612
2613 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
2614 goto cantfind_ext4;
2615
2616 /* check blocks count against device size */
2617 blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
2618 if (blocks_count && ext4_blocks_count(es) > blocks_count) {
2619 ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
2620 "exceeds size of device (%llu blocks)",
2621 ext4_blocks_count(es), blocks_count);
2622 goto failed_mount;
2623 }
2624
2625 /*
2626 * It makes no sense for the first data block to be beyond the end
2627 * of the filesystem.
2628 */
2629 if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
2630 ext4_msg(sb, KERN_WARNING, "bad geometry: first data"
2631 "block %u is beyond end of filesystem (%llu)",
2632 le32_to_cpu(es->s_first_data_block),
2633 ext4_blocks_count(es));
2634 goto failed_mount;
2635 }
2636 blocks_count = (ext4_blocks_count(es) -
2637 le32_to_cpu(es->s_first_data_block) +
2638 EXT4_BLOCKS_PER_GROUP(sb) - 1);
2639 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
2640 if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
2641 ext4_msg(sb, KERN_WARNING, "groups count too large: %u "
2642 "(block count %llu, first data block %u, "
2643 "blocks per group %lu)", sbi->s_groups_count,
2644 ext4_blocks_count(es),
2645 le32_to_cpu(es->s_first_data_block),
2646 EXT4_BLOCKS_PER_GROUP(sb));
2647 goto failed_mount;
2648 }
2649 sbi->s_groups_count = blocks_count;
2650 sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
2651 (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
2652 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
2653 EXT4_DESC_PER_BLOCK(sb);
2654 sbi->s_group_desc = kmalloc(db_count * sizeof(struct buffer_head *),
2655 GFP_KERNEL);
2656 if (sbi->s_group_desc == NULL) {
2657 ext4_msg(sb, KERN_ERR, "not enough memory");
2658 goto failed_mount;
2659 }
2660
2661 #ifdef CONFIG_PROC_FS
2662 if (ext4_proc_root)
2663 sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);
2664 #endif
2665
2666 bgl_lock_init(sbi->s_blockgroup_lock);
2667
2668 for (i = 0; i < db_count; i++) {
2669 block = descriptor_loc(sb, logical_sb_block, i);
2670 sbi->s_group_desc[i] = sb_bread(sb, block);
2671 if (!sbi->s_group_desc[i]) {
2672 ext4_msg(sb, KERN_ERR,
2673 "can't read group descriptor %d", i);
2674 db_count = i;
2675 goto failed_mount2;
2676 }
2677 }
2678 if (!ext4_check_descriptors(sb)) {
2679 ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
2680 goto failed_mount2;
2681 }
2682 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
2683 if (!ext4_fill_flex_info(sb)) {
2684 ext4_msg(sb, KERN_ERR,
2685 "unable to initialize "
2686 "flex_bg meta info!");
2687 goto failed_mount2;
2688 }
2689
2690 sbi->s_gdb_count = db_count;
2691 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
2692 spin_lock_init(&sbi->s_next_gen_lock);
2693
2694 err = percpu_counter_init(&sbi->s_freeblocks_counter,
2695 ext4_count_free_blocks(sb));
2696 if (!err) {
2697 err = percpu_counter_init(&sbi->s_freeinodes_counter,
2698 ext4_count_free_inodes(sb));
2699 }
2700 if (!err) {
2701 err = percpu_counter_init(&sbi->s_dirs_counter,
2702 ext4_count_dirs(sb));
2703 }
2704 if (!err) {
2705 err = percpu_counter_init(&sbi->s_dirtyblocks_counter, 0);
2706 }
2707 if (err) {
2708 ext4_msg(sb, KERN_ERR, "insufficient memory");
2709 goto failed_mount3;
2710 }
2711
2712 sbi->s_stripe = ext4_get_stripe_size(sbi);
2713 sbi->s_max_writeback_mb_bump = 128;
2714
2715 /*
2716 * set up enough so that it can read an inode
2717 */
2718 if (!test_opt(sb, NOLOAD) &&
2719 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
2720 sb->s_op = &ext4_sops;
2721 else
2722 sb->s_op = &ext4_nojournal_sops;
2723 sb->s_export_op = &ext4_export_ops;
2724 sb->s_xattr = ext4_xattr_handlers;
2725 #ifdef CONFIG_QUOTA
2726 sb->s_qcop = &ext4_qctl_operations;
2727 sb->dq_op = &ext4_quota_operations;
2728 #endif
2729 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
2730 mutex_init(&sbi->s_orphan_lock);
2731 mutex_init(&sbi->s_resize_lock);
2732
2733 sb->s_root = NULL;
2734
2735 needs_recovery = (es->s_last_orphan != 0 ||
2736 EXT4_HAS_INCOMPAT_FEATURE(sb,
2737 EXT4_FEATURE_INCOMPAT_RECOVER));
2738
2739 /*
2740 * The first inode we look at is the journal inode. Don't try
2741 * root first: it may be modified in the journal!
2742 */
2743 if (!test_opt(sb, NOLOAD) &&
2744 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
2745 if (ext4_load_journal(sb, es, journal_devnum))
2746 goto failed_mount3;
2747 if (!(sb->s_flags & MS_RDONLY) &&
2748 EXT4_SB(sb)->s_journal->j_failed_commit) {
2749 ext4_msg(sb, KERN_CRIT, "error: "
2750 "ext4_fill_super: Journal transaction "
2751 "%u is corrupt",
2752 EXT4_SB(sb)->s_journal->j_failed_commit);
2753 if (test_opt(sb, ERRORS_RO)) {
2754 ext4_msg(sb, KERN_CRIT,
2755 "Mounting filesystem read-only");
2756 sb->s_flags |= MS_RDONLY;
2757 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
2758 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
2759 }
2760 if (test_opt(sb, ERRORS_PANIC)) {
2761 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
2762 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
2763 ext4_commit_super(sb, 1);
2764 goto failed_mount4;
2765 }
2766 }
2767 } else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) &&
2768 EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
2769 ext4_msg(sb, KERN_ERR, "required journal recovery "
2770 "suppressed and not mounted read-only");
2771 goto failed_mount4;
2772 } else {
2773 clear_opt(sbi->s_mount_opt, DATA_FLAGS);
2774 set_opt(sbi->s_mount_opt, WRITEBACK_DATA);
2775 sbi->s_journal = NULL;
2776 needs_recovery = 0;
2777 goto no_journal;
2778 }
2779
2780 if (ext4_blocks_count(es) > 0xffffffffULL &&
2781 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
2782 JBD2_FEATURE_INCOMPAT_64BIT)) {
2783 ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
2784 goto failed_mount4;
2785 }
2786
2787 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
2788 jbd2_journal_set_features(sbi->s_journal,
2789 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
2790 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2791 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
2792 jbd2_journal_set_features(sbi->s_journal,
2793 JBD2_FEATURE_COMPAT_CHECKSUM, 0, 0);
2794 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
2795 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2796 } else {
2797 jbd2_journal_clear_features(sbi->s_journal,
2798 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
2799 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2800 }
2801
2802 /* We have now updated the journal if required, so we can
2803 * validate the data journaling mode. */
2804 switch (test_opt(sb, DATA_FLAGS)) {
2805 case 0:
2806 /* No mode set, assume a default based on the journal
2807 * capabilities: ORDERED_DATA if the journal can
2808 * cope, else JOURNAL_DATA
2809 */
2810 if (jbd2_journal_check_available_features
2811 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
2812 set_opt(sbi->s_mount_opt, ORDERED_DATA);
2813 else
2814 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
2815 break;
2816
2817 case EXT4_MOUNT_ORDERED_DATA:
2818 case EXT4_MOUNT_WRITEBACK_DATA:
2819 if (!jbd2_journal_check_available_features
2820 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
2821 ext4_msg(sb, KERN_ERR, "Journal does not support "
2822 "requested data journaling mode");
2823 goto failed_mount4;
2824 }
2825 default:
2826 break;
2827 }
2828 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
2829
2830 no_journal:
2831
2832 if (test_opt(sb, NOBH)) {
2833 if (!(test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)) {
2834 ext4_msg(sb, KERN_WARNING, "Ignoring nobh option - "
2835 "its supported only with writeback mode");
2836 clear_opt(sbi->s_mount_opt, NOBH);
2837 }
2838 }
2839 EXT4_SB(sb)->dio_unwritten_wq = create_workqueue("ext4-dio-unwritten");
2840 if (!EXT4_SB(sb)->dio_unwritten_wq) {
2841 printk(KERN_ERR "EXT4-fs: failed to create DIO workqueue\n");
2842 goto failed_mount_wq;
2843 }
2844
2845 /*
2846 * The jbd2_journal_load will have done any necessary log recovery,
2847 * so we can safely mount the rest of the filesystem now.
2848 */
2849
2850 root = ext4_iget(sb, EXT4_ROOT_INO);
2851 if (IS_ERR(root)) {
2852 ext4_msg(sb, KERN_ERR, "get root inode failed");
2853 ret = PTR_ERR(root);
2854 goto failed_mount4;
2855 }
2856 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
2857 iput(root);
2858 ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
2859 goto failed_mount4;
2860 }
2861 sb->s_root = d_alloc_root(root);
2862 if (!sb->s_root) {
2863 ext4_msg(sb, KERN_ERR, "get root dentry failed");
2864 iput(root);
2865 ret = -ENOMEM;
2866 goto failed_mount4;
2867 }
2868
2869 ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY);
2870
2871 /* determine the minimum size of new large inodes, if present */
2872 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
2873 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
2874 EXT4_GOOD_OLD_INODE_SIZE;
2875 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
2876 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) {
2877 if (sbi->s_want_extra_isize <
2878 le16_to_cpu(es->s_want_extra_isize))
2879 sbi->s_want_extra_isize =
2880 le16_to_cpu(es->s_want_extra_isize);
2881 if (sbi->s_want_extra_isize <
2882 le16_to_cpu(es->s_min_extra_isize))
2883 sbi->s_want_extra_isize =
2884 le16_to_cpu(es->s_min_extra_isize);
2885 }
2886 }
2887 /* Check if enough inode space is available */
2888 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
2889 sbi->s_inode_size) {
2890 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
2891 EXT4_GOOD_OLD_INODE_SIZE;
2892 ext4_msg(sb, KERN_INFO, "required extra inode space not"
2893 "available");
2894 }
2895
2896 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
2897 ext4_msg(sb, KERN_WARNING, "Ignoring delalloc option - "
2898 "requested data journaling mode");
2899 clear_opt(sbi->s_mount_opt, DELALLOC);
2900 } else if (test_opt(sb, DELALLOC))
2901 ext4_msg(sb, KERN_INFO, "delayed allocation enabled");
2902
2903 err = ext4_setup_system_zone(sb);
2904 if (err) {
2905 ext4_msg(sb, KERN_ERR, "failed to initialize system "
2906 "zone (%d)\n", err);
2907 goto failed_mount4;
2908 }
2909
2910 ext4_ext_init(sb);
2911 err = ext4_mb_init(sb, needs_recovery);
2912 if (err) {
2913 ext4_msg(sb, KERN_ERR, "failed to initalize mballoc (%d)",
2914 err);
2915 goto failed_mount4;
2916 }
2917
2918 sbi->s_kobj.kset = ext4_kset;
2919 init_completion(&sbi->s_kobj_unregister);
2920 err = kobject_init_and_add(&sbi->s_kobj, &ext4_ktype, NULL,
2921 "%s", sb->s_id);
2922 if (err) {
2923 ext4_mb_release(sb);
2924 ext4_ext_release(sb);
2925 goto failed_mount4;
2926 };
2927
2928 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
2929 ext4_orphan_cleanup(sb, es);
2930 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
2931 if (needs_recovery) {
2932 ext4_msg(sb, KERN_INFO, "recovery complete");
2933 ext4_mark_recovery_complete(sb, es);
2934 }
2935 if (EXT4_SB(sb)->s_journal) {
2936 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
2937 descr = " journalled data mode";
2938 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
2939 descr = " ordered data mode";
2940 else
2941 descr = " writeback data mode";
2942 } else
2943 descr = "out journal";
2944
2945 ext4_msg(sb, KERN_INFO, "mounted filesystem with%s", descr);
2946
2947 lock_kernel();
2948 return 0;
2949
2950 cantfind_ext4:
2951 if (!silent)
2952 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
2953 goto failed_mount;
2954
2955 failed_mount4:
2956 ext4_msg(sb, KERN_ERR, "mount failed");
2957 destroy_workqueue(EXT4_SB(sb)->dio_unwritten_wq);
2958 failed_mount_wq:
2959 ext4_release_system_zone(sb);
2960 if (sbi->s_journal) {
2961 jbd2_journal_destroy(sbi->s_journal);
2962 sbi->s_journal = NULL;
2963 }
2964 failed_mount3:
2965 if (sbi->s_flex_groups) {
2966 if (is_vmalloc_addr(sbi->s_flex_groups))
2967 vfree(sbi->s_flex_groups);
2968 else
2969 kfree(sbi->s_flex_groups);
2970 }
2971 percpu_counter_destroy(&sbi->s_freeblocks_counter);
2972 percpu_counter_destroy(&sbi->s_freeinodes_counter);
2973 percpu_counter_destroy(&sbi->s_dirs_counter);
2974 percpu_counter_destroy(&sbi->s_dirtyblocks_counter);
2975 failed_mount2:
2976 for (i = 0; i < db_count; i++)
2977 brelse(sbi->s_group_desc[i]);
2978 kfree(sbi->s_group_desc);
2979 failed_mount:
2980 if (sbi->s_proc) {
2981 remove_proc_entry(sb->s_id, ext4_proc_root);
2982 }
2983 #ifdef CONFIG_QUOTA
2984 for (i = 0; i < MAXQUOTAS; i++)
2985 kfree(sbi->s_qf_names[i]);
2986 #endif
2987 ext4_blkdev_remove(sbi);
2988 brelse(bh);
2989 out_fail:
2990 sb->s_fs_info = NULL;
2991 kfree(sbi->s_blockgroup_lock);
2992 kfree(sbi);
2993 lock_kernel();
2994 return ret;
2995 }
2996
2997 /*
2998 * Setup any per-fs journal parameters now. We'll do this both on
2999 * initial mount, once the journal has been initialised but before we've
3000 * done any recovery; and again on any subsequent remount.
3001 */
3002 static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
3003 {
3004 struct ext4_sb_info *sbi = EXT4_SB(sb);
3005
3006 journal->j_commit_interval = sbi->s_commit_interval;
3007 journal->j_min_batch_time = sbi->s_min_batch_time;
3008 journal->j_max_batch_time = sbi->s_max_batch_time;
3009
3010 spin_lock(&journal->j_state_lock);
3011 if (test_opt(sb, BARRIER))
3012 journal->j_flags |= JBD2_BARRIER;
3013 else
3014 journal->j_flags &= ~JBD2_BARRIER;
3015 if (test_opt(sb, DATA_ERR_ABORT))
3016 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
3017 else
3018 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
3019 spin_unlock(&journal->j_state_lock);
3020 }
3021
3022 static journal_t *ext4_get_journal(struct super_block *sb,
3023 unsigned int journal_inum)
3024 {
3025 struct inode *journal_inode;
3026 journal_t *journal;
3027
3028 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3029
3030 /* First, test for the existence of a valid inode on disk. Bad
3031 * things happen if we iget() an unused inode, as the subsequent
3032 * iput() will try to delete it. */
3033
3034 journal_inode = ext4_iget(sb, journal_inum);
3035 if (IS_ERR(journal_inode)) {
3036 ext4_msg(sb, KERN_ERR, "no journal found");
3037 return NULL;
3038 }
3039 if (!journal_inode->i_nlink) {
3040 make_bad_inode(journal_inode);
3041 iput(journal_inode);
3042 ext4_msg(sb, KERN_ERR, "journal inode is deleted");
3043 return NULL;
3044 }
3045
3046 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
3047 journal_inode, journal_inode->i_size);
3048 if (!S_ISREG(journal_inode->i_mode)) {
3049 ext4_msg(sb, KERN_ERR, "invalid journal inode");
3050 iput(journal_inode);
3051 return NULL;
3052 }
3053
3054 journal = jbd2_journal_init_inode(journal_inode);
3055 if (!journal) {
3056 ext4_msg(sb, KERN_ERR, "Could not load journal inode");
3057 iput(journal_inode);
3058 return NULL;
3059 }
3060 journal->j_private = sb;
3061 ext4_init_journal_params(sb, journal);
3062 return journal;
3063 }
3064
3065 static journal_t *ext4_get_dev_journal(struct super_block *sb,
3066 dev_t j_dev)
3067 {
3068 struct buffer_head *bh;
3069 journal_t *journal;
3070 ext4_fsblk_t start;
3071 ext4_fsblk_t len;
3072 int hblock, blocksize;
3073 ext4_fsblk_t sb_block;
3074 unsigned long offset;
3075 struct ext4_super_block *es;
3076 struct block_device *bdev;
3077
3078 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3079
3080 bdev = ext4_blkdev_get(j_dev, sb);
3081 if (bdev == NULL)
3082 return NULL;
3083
3084 if (bd_claim(bdev, sb)) {
3085 ext4_msg(sb, KERN_ERR,
3086 "failed to claim external journal device");
3087 blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
3088 return NULL;
3089 }
3090
3091 blocksize = sb->s_blocksize;
3092 hblock = bdev_logical_block_size(bdev);
3093 if (blocksize < hblock) {
3094 ext4_msg(sb, KERN_ERR,
3095 "blocksize too small for journal device");
3096 goto out_bdev;
3097 }
3098
3099 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
3100 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
3101 set_blocksize(bdev, blocksize);
3102 if (!(bh = __bread(bdev, sb_block, blocksize))) {
3103 ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
3104 "external journal");
3105 goto out_bdev;
3106 }
3107
3108 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
3109 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
3110 !(le32_to_cpu(es->s_feature_incompat) &
3111 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
3112 ext4_msg(sb, KERN_ERR, "external journal has "
3113 "bad superblock");
3114 brelse(bh);
3115 goto out_bdev;
3116 }
3117
3118 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
3119 ext4_msg(sb, KERN_ERR, "journal UUID does not match");
3120 brelse(bh);
3121 goto out_bdev;
3122 }
3123
3124 len = ext4_blocks_count(es);
3125 start = sb_block + 1;
3126 brelse(bh); /* we're done with the superblock */
3127
3128 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
3129 start, len, blocksize);
3130 if (!journal) {
3131 ext4_msg(sb, KERN_ERR, "failed to create device journal");
3132 goto out_bdev;
3133 }
3134 journal->j_private = sb;
3135 ll_rw_block(READ, 1, &journal->j_sb_buffer);
3136 wait_on_buffer(journal->j_sb_buffer);
3137 if (!buffer_uptodate(journal->j_sb_buffer)) {
3138 ext4_msg(sb, KERN_ERR, "I/O error on journal device");
3139 goto out_journal;
3140 }
3141 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
3142 ext4_msg(sb, KERN_ERR, "External journal has more than one "
3143 "user (unsupported) - %d",
3144 be32_to_cpu(journal->j_superblock->s_nr_users));
3145 goto out_journal;
3146 }
3147 EXT4_SB(sb)->journal_bdev = bdev;
3148 ext4_init_journal_params(sb, journal);
3149 return journal;
3150
3151 out_journal:
3152 jbd2_journal_destroy(journal);
3153 out_bdev:
3154 ext4_blkdev_put(bdev);
3155 return NULL;
3156 }
3157
3158 static int ext4_load_journal(struct super_block *sb,
3159 struct ext4_super_block *es,
3160 unsigned long journal_devnum)
3161 {
3162 journal_t *journal;
3163 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
3164 dev_t journal_dev;
3165 int err = 0;
3166 int really_read_only;
3167
3168 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3169
3170 if (journal_devnum &&
3171 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
3172 ext4_msg(sb, KERN_INFO, "external journal device major/minor "
3173 "numbers have changed");
3174 journal_dev = new_decode_dev(journal_devnum);
3175 } else
3176 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
3177
3178 really_read_only = bdev_read_only(sb->s_bdev);
3179
3180 /*
3181 * Are we loading a blank journal or performing recovery after a
3182 * crash? For recovery, we need to check in advance whether we
3183 * can get read-write access to the device.
3184 */
3185 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
3186 if (sb->s_flags & MS_RDONLY) {
3187 ext4_msg(sb, KERN_INFO, "INFO: recovery "
3188 "required on readonly filesystem");
3189 if (really_read_only) {
3190 ext4_msg(sb, KERN_ERR, "write access "
3191 "unavailable, cannot proceed");
3192 return -EROFS;
3193 }
3194 ext4_msg(sb, KERN_INFO, "write access will "
3195 "be enabled during recovery");
3196 }
3197 }
3198
3199 if (journal_inum && journal_dev) {
3200 ext4_msg(sb, KERN_ERR, "filesystem has both journal "
3201 "and inode journals!");
3202 return -EINVAL;
3203 }
3204
3205 if (journal_inum) {
3206 if (!(journal = ext4_get_journal(sb, journal_inum)))
3207 return -EINVAL;
3208 } else {
3209 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
3210 return -EINVAL;
3211 }
3212
3213 if (journal->j_flags & JBD2_BARRIER)
3214 ext4_msg(sb, KERN_INFO, "barriers enabled");
3215 else
3216 ext4_msg(sb, KERN_INFO, "barriers disabled");
3217
3218 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
3219 err = jbd2_journal_update_format(journal);
3220 if (err) {
3221 ext4_msg(sb, KERN_ERR, "error updating journal");
3222 jbd2_journal_destroy(journal);
3223 return err;
3224 }
3225 }
3226
3227 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
3228 err = jbd2_journal_wipe(journal, !really_read_only);
3229 if (!err)
3230 err = jbd2_journal_load(journal);
3231
3232 if (err) {
3233 ext4_msg(sb, KERN_ERR, "error loading journal");
3234 jbd2_journal_destroy(journal);
3235 return err;
3236 }
3237
3238 EXT4_SB(sb)->s_journal = journal;
3239 ext4_clear_journal_err(sb, es);
3240
3241 if (journal_devnum &&
3242 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
3243 es->s_journal_dev = cpu_to_le32(journal_devnum);
3244
3245 /* Make sure we flush the recovery flag to disk. */
3246 ext4_commit_super(sb, 1);
3247 }
3248
3249 return 0;
3250 }
3251
3252 static int ext4_commit_super(struct super_block *sb, int sync)
3253 {
3254 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
3255 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
3256 int error = 0;
3257
3258 if (!sbh)
3259 return error;
3260 if (buffer_write_io_error(sbh)) {
3261 /*
3262 * Oh, dear. A previous attempt to write the
3263 * superblock failed. This could happen because the
3264 * USB device was yanked out. Or it could happen to
3265 * be a transient write error and maybe the block will
3266 * be remapped. Nothing we can do but to retry the
3267 * write and hope for the best.
3268 */
3269 ext4_msg(sb, KERN_ERR, "previous I/O error to "
3270 "superblock detected");
3271 clear_buffer_write_io_error(sbh);
3272 set_buffer_uptodate(sbh);
3273 }
3274 /*
3275 * If the file system is mounted read-only, don't update the
3276 * superblock write time. This avoids updating the superblock
3277 * write time when we are mounting the root file system
3278 * read/only but we need to replay the journal; at that point,
3279 * for people who are east of GMT and who make their clock
3280 * tick in localtime for Windows bug-for-bug compatibility,
3281 * the clock is set in the future, and this will cause e2fsck
3282 * to complain and force a full file system check.
3283 */
3284 if (!(sb->s_flags & MS_RDONLY))
3285 es->s_wtime = cpu_to_le32(get_seconds());
3286 es->s_kbytes_written =
3287 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written +
3288 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
3289 EXT4_SB(sb)->s_sectors_written_start) >> 1));
3290 ext4_free_blocks_count_set(es, percpu_counter_sum_positive(
3291 &EXT4_SB(sb)->s_freeblocks_counter));
3292 es->s_free_inodes_count = cpu_to_le32(percpu_counter_sum_positive(
3293 &EXT4_SB(sb)->s_freeinodes_counter));
3294 sb->s_dirt = 0;
3295 BUFFER_TRACE(sbh, "marking dirty");
3296 mark_buffer_dirty(sbh);
3297 if (sync) {
3298 error = sync_dirty_buffer(sbh);
3299 if (error)
3300 return error;
3301
3302 error = buffer_write_io_error(sbh);
3303 if (error) {
3304 ext4_msg(sb, KERN_ERR, "I/O error while writing "
3305 "superblock");
3306 clear_buffer_write_io_error(sbh);
3307 set_buffer_uptodate(sbh);
3308 }
3309 }
3310 return error;
3311 }
3312
3313 /*
3314 * Have we just finished recovery? If so, and if we are mounting (or
3315 * remounting) the filesystem readonly, then we will end up with a
3316 * consistent fs on disk. Record that fact.
3317 */
3318 static void ext4_mark_recovery_complete(struct super_block *sb,
3319 struct ext4_super_block *es)
3320 {
3321 journal_t *journal = EXT4_SB(sb)->s_journal;
3322
3323 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
3324 BUG_ON(journal != NULL);
3325 return;
3326 }
3327 jbd2_journal_lock_updates(journal);
3328 if (jbd2_journal_flush(journal) < 0)
3329 goto out;
3330
3331 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
3332 sb->s_flags & MS_RDONLY) {
3333 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
3334 ext4_commit_super(sb, 1);
3335 }
3336
3337 out:
3338 jbd2_journal_unlock_updates(journal);
3339 }
3340
3341 /*
3342 * If we are mounting (or read-write remounting) a filesystem whose journal
3343 * has recorded an error from a previous lifetime, move that error to the
3344 * main filesystem now.
3345 */
3346 static void ext4_clear_journal_err(struct super_block *sb,
3347 struct ext4_super_block *es)
3348 {
3349 journal_t *journal;
3350 int j_errno;
3351 const char *errstr;
3352
3353 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3354
3355 journal = EXT4_SB(sb)->s_journal;
3356
3357 /*
3358 * Now check for any error status which may have been recorded in the
3359 * journal by a prior ext4_error() or ext4_abort()
3360 */
3361
3362 j_errno = jbd2_journal_errno(journal);
3363 if (j_errno) {
3364 char nbuf[16];
3365
3366 errstr = ext4_decode_error(sb, j_errno, nbuf);
3367 ext4_warning(sb, __func__, "Filesystem error recorded "
3368 "from previous mount: %s", errstr);
3369 ext4_warning(sb, __func__, "Marking fs in need of "
3370 "filesystem check.");
3371
3372 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
3373 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
3374 ext4_commit_super(sb, 1);
3375
3376 jbd2_journal_clear_err(journal);
3377 }
3378 }
3379
3380 /*
3381 * Force the running and committing transactions to commit,
3382 * and wait on the commit.
3383 */
3384 int ext4_force_commit(struct super_block *sb)
3385 {
3386 journal_t *journal;
3387 int ret = 0;
3388
3389 if (sb->s_flags & MS_RDONLY)
3390 return 0;
3391
3392 journal = EXT4_SB(sb)->s_journal;
3393 if (journal)
3394 ret = ext4_journal_force_commit(journal);
3395
3396 return ret;
3397 }
3398
3399 static void ext4_write_super(struct super_block *sb)
3400 {
3401 lock_super(sb);
3402 ext4_commit_super(sb, 1);
3403 unlock_super(sb);
3404 }
3405
3406 static int ext4_sync_fs(struct super_block *sb, int wait)
3407 {
3408 int ret = 0;
3409 tid_t target;
3410 struct ext4_sb_info *sbi = EXT4_SB(sb);
3411
3412 trace_ext4_sync_fs(sb, wait);
3413 flush_workqueue(sbi->dio_unwritten_wq);
3414 if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
3415 if (wait)
3416 jbd2_log_wait_commit(sbi->s_journal, target);
3417 }
3418 return ret;
3419 }
3420
3421 /*
3422 * LVM calls this function before a (read-only) snapshot is created. This
3423 * gives us a chance to flush the journal completely and mark the fs clean.
3424 */
3425 static int ext4_freeze(struct super_block *sb)
3426 {
3427 int error = 0;
3428 journal_t *journal;
3429
3430 if (sb->s_flags & MS_RDONLY)
3431 return 0;
3432
3433 journal = EXT4_SB(sb)->s_journal;
3434
3435 /* Now we set up the journal barrier. */
3436 jbd2_journal_lock_updates(journal);
3437
3438 /*
3439 * Don't clear the needs_recovery flag if we failed to flush
3440 * the journal.
3441 */
3442 error = jbd2_journal_flush(journal);
3443 if (error < 0) {
3444 out:
3445 jbd2_journal_unlock_updates(journal);
3446 return error;
3447 }
3448
3449 /* Journal blocked and flushed, clear needs_recovery flag. */
3450 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
3451 error = ext4_commit_super(sb, 1);
3452 if (error)
3453 goto out;
3454 return 0;
3455 }
3456
3457 /*
3458 * Called by LVM after the snapshot is done. We need to reset the RECOVER
3459 * flag here, even though the filesystem is not technically dirty yet.
3460 */
3461 static int ext4_unfreeze(struct super_block *sb)
3462 {
3463 if (sb->s_flags & MS_RDONLY)
3464 return 0;
3465
3466 lock_super(sb);
3467 /* Reset the needs_recovery flag before the fs is unlocked. */
3468 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
3469 ext4_commit_super(sb, 1);
3470 unlock_super(sb);
3471 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
3472 return 0;
3473 }
3474
3475 static int ext4_remount(struct super_block *sb, int *flags, char *data)
3476 {
3477 struct ext4_super_block *es;
3478 struct ext4_sb_info *sbi = EXT4_SB(sb);
3479 ext4_fsblk_t n_blocks_count = 0;
3480 unsigned long old_sb_flags;
3481 struct ext4_mount_options old_opts;
3482 ext4_group_t g;
3483 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
3484 int err;
3485 #ifdef CONFIG_QUOTA
3486 int i;
3487 #endif
3488
3489 lock_kernel();
3490
3491 /* Store the original options */
3492 lock_super(sb);
3493 old_sb_flags = sb->s_flags;
3494 old_opts.s_mount_opt = sbi->s_mount_opt;
3495 old_opts.s_resuid = sbi->s_resuid;
3496 old_opts.s_resgid = sbi->s_resgid;
3497 old_opts.s_commit_interval = sbi->s_commit_interval;
3498 old_opts.s_min_batch_time = sbi->s_min_batch_time;
3499 old_opts.s_max_batch_time = sbi->s_max_batch_time;
3500 #ifdef CONFIG_QUOTA
3501 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
3502 for (i = 0; i < MAXQUOTAS; i++)
3503 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
3504 #endif
3505 if (sbi->s_journal && sbi->s_journal->j_task->io_context)
3506 journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
3507
3508 /*
3509 * Allow the "check" option to be passed as a remount option.
3510 */
3511 if (!parse_options(data, sb, NULL, &journal_ioprio,
3512 &n_blocks_count, 1)) {
3513 err = -EINVAL;
3514 goto restore_opts;
3515 }
3516
3517 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
3518 ext4_abort(sb, __func__, "Abort forced by user");
3519
3520 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
3521 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
3522
3523 es = sbi->s_es;
3524
3525 if (sbi->s_journal) {
3526 ext4_init_journal_params(sb, sbi->s_journal);
3527 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
3528 }
3529
3530 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
3531 n_blocks_count > ext4_blocks_count(es)) {
3532 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) {
3533 err = -EROFS;
3534 goto restore_opts;
3535 }
3536
3537 if (*flags & MS_RDONLY) {
3538 /*
3539 * First of all, the unconditional stuff we have to do
3540 * to disable replay of the journal when we next remount
3541 */
3542 sb->s_flags |= MS_RDONLY;
3543
3544 /*
3545 * OK, test if we are remounting a valid rw partition
3546 * readonly, and if so set the rdonly flag and then
3547 * mark the partition as valid again.
3548 */
3549 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
3550 (sbi->s_mount_state & EXT4_VALID_FS))
3551 es->s_state = cpu_to_le16(sbi->s_mount_state);
3552
3553 if (sbi->s_journal)
3554 ext4_mark_recovery_complete(sb, es);
3555 } else {
3556 /* Make sure we can mount this feature set readwrite */
3557 if (!ext4_feature_set_ok(sb, 0)) {
3558 err = -EROFS;
3559 goto restore_opts;
3560 }
3561 /*
3562 * Make sure the group descriptor checksums
3563 * are sane. If they aren't, refuse to remount r/w.
3564 */
3565 for (g = 0; g < sbi->s_groups_count; g++) {
3566 struct ext4_group_desc *gdp =
3567 ext4_get_group_desc(sb, g, NULL);
3568
3569 if (!ext4_group_desc_csum_verify(sbi, g, gdp)) {
3570 ext4_msg(sb, KERN_ERR,
3571 "ext4_remount: Checksum for group %u failed (%u!=%u)",
3572 g, le16_to_cpu(ext4_group_desc_csum(sbi, g, gdp)),
3573 le16_to_cpu(gdp->bg_checksum));
3574 err = -EINVAL;
3575 goto restore_opts;
3576 }
3577 }
3578
3579 /*
3580 * If we have an unprocessed orphan list hanging
3581 * around from a previously readonly bdev mount,
3582 * require a full umount/remount for now.
3583 */
3584 if (es->s_last_orphan) {
3585 ext4_msg(sb, KERN_WARNING, "Couldn't "
3586 "remount RDWR because of unprocessed "
3587 "orphan inode list. Please "
3588 "umount/remount instead");
3589 err = -EINVAL;
3590 goto restore_opts;
3591 }
3592
3593 /*
3594 * Mounting a RDONLY partition read-write, so reread
3595 * and store the current valid flag. (It may have
3596 * been changed by e2fsck since we originally mounted
3597 * the partition.)
3598 */
3599 if (sbi->s_journal)
3600 ext4_clear_journal_err(sb, es);
3601 sbi->s_mount_state = le16_to_cpu(es->s_state);
3602 if ((err = ext4_group_extend(sb, es, n_blocks_count)))
3603 goto restore_opts;
3604 if (!ext4_setup_super(sb, es, 0))
3605 sb->s_flags &= ~MS_RDONLY;
3606 }
3607 }
3608 ext4_setup_system_zone(sb);
3609 if (sbi->s_journal == NULL)
3610 ext4_commit_super(sb, 1);
3611
3612 #ifdef CONFIG_QUOTA
3613 /* Release old quota file names */
3614 for (i = 0; i < MAXQUOTAS; i++)
3615 if (old_opts.s_qf_names[i] &&
3616 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
3617 kfree(old_opts.s_qf_names[i]);
3618 #endif
3619 unlock_super(sb);
3620 unlock_kernel();
3621 return 0;
3622
3623 restore_opts:
3624 sb->s_flags = old_sb_flags;
3625 sbi->s_mount_opt = old_opts.s_mount_opt;
3626 sbi->s_resuid = old_opts.s_resuid;
3627 sbi->s_resgid = old_opts.s_resgid;
3628 sbi->s_commit_interval = old_opts.s_commit_interval;
3629 sbi->s_min_batch_time = old_opts.s_min_batch_time;
3630 sbi->s_max_batch_time = old_opts.s_max_batch_time;
3631 #ifdef CONFIG_QUOTA
3632 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
3633 for (i = 0; i < MAXQUOTAS; i++) {
3634 if (sbi->s_qf_names[i] &&
3635 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
3636 kfree(sbi->s_qf_names[i]);
3637 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
3638 }
3639 #endif
3640 unlock_super(sb);
3641 unlock_kernel();
3642 return err;
3643 }
3644
3645 static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
3646 {
3647 struct super_block *sb = dentry->d_sb;
3648 struct ext4_sb_info *sbi = EXT4_SB(sb);
3649 struct ext4_super_block *es = sbi->s_es;
3650 u64 fsid;
3651
3652 if (test_opt(sb, MINIX_DF)) {
3653 sbi->s_overhead_last = 0;
3654 } else if (sbi->s_blocks_last != ext4_blocks_count(es)) {
3655 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3656 ext4_fsblk_t overhead = 0;
3657
3658 /*
3659 * Compute the overhead (FS structures). This is constant
3660 * for a given filesystem unless the number of block groups
3661 * changes so we cache the previous value until it does.
3662 */
3663
3664 /*
3665 * All of the blocks before first_data_block are
3666 * overhead
3667 */
3668 overhead = le32_to_cpu(es->s_first_data_block);
3669
3670 /*
3671 * Add the overhead attributed to the superblock and
3672 * block group descriptors. If the sparse superblocks
3673 * feature is turned on, then not all groups have this.
3674 */
3675 for (i = 0; i < ngroups; i++) {
3676 overhead += ext4_bg_has_super(sb, i) +
3677 ext4_bg_num_gdb(sb, i);
3678 cond_resched();
3679 }
3680
3681 /*
3682 * Every block group has an inode bitmap, a block
3683 * bitmap, and an inode table.
3684 */
3685 overhead += ngroups * (2 + sbi->s_itb_per_group);
3686 sbi->s_overhead_last = overhead;
3687 smp_wmb();
3688 sbi->s_blocks_last = ext4_blocks_count(es);
3689 }
3690
3691 buf->f_type = EXT4_SUPER_MAGIC;
3692 buf->f_bsize = sb->s_blocksize;
3693 buf->f_blocks = ext4_blocks_count(es) - sbi->s_overhead_last;
3694 buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter) -
3695 percpu_counter_sum_positive(&sbi->s_dirtyblocks_counter);
3696 ext4_free_blocks_count_set(es, buf->f_bfree);
3697 buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es);
3698 if (buf->f_bfree < ext4_r_blocks_count(es))
3699 buf->f_bavail = 0;
3700 buf->f_files = le32_to_cpu(es->s_inodes_count);
3701 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
3702 es->s_free_inodes_count = cpu_to_le32(buf->f_ffree);
3703 buf->f_namelen = EXT4_NAME_LEN;
3704 fsid = le64_to_cpup((void *)es->s_uuid) ^
3705 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
3706 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
3707 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
3708
3709 return 0;
3710 }
3711
3712 /* Helper function for writing quotas on sync - we need to start transaction
3713 * before quota file is locked for write. Otherwise the are possible deadlocks:
3714 * Process 1 Process 2
3715 * ext4_create() quota_sync()
3716 * jbd2_journal_start() write_dquot()
3717 * vfs_dq_init() down(dqio_mutex)
3718 * down(dqio_mutex) jbd2_journal_start()
3719 *
3720 */
3721
3722 #ifdef CONFIG_QUOTA
3723
3724 static inline struct inode *dquot_to_inode(struct dquot *dquot)
3725 {
3726 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
3727 }
3728
3729 static int ext4_write_dquot(struct dquot *dquot)
3730 {
3731 int ret, err;
3732 handle_t *handle;
3733 struct inode *inode;
3734
3735 inode = dquot_to_inode(dquot);
3736 handle = ext4_journal_start(inode,
3737 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
3738 if (IS_ERR(handle))
3739 return PTR_ERR(handle);
3740 ret = dquot_commit(dquot);
3741 err = ext4_journal_stop(handle);
3742 if (!ret)
3743 ret = err;
3744 return ret;
3745 }
3746
3747 static int ext4_acquire_dquot(struct dquot *dquot)
3748 {
3749 int ret, err;
3750 handle_t *handle;
3751
3752 handle = ext4_journal_start(dquot_to_inode(dquot),
3753 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
3754 if (IS_ERR(handle))
3755 return PTR_ERR(handle);
3756 ret = dquot_acquire(dquot);
3757 err = ext4_journal_stop(handle);
3758 if (!ret)
3759 ret = err;
3760 return ret;
3761 }
3762
3763 static int ext4_release_dquot(struct dquot *dquot)
3764 {
3765 int ret, err;
3766 handle_t *handle;
3767
3768 handle = ext4_journal_start(dquot_to_inode(dquot),
3769 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
3770 if (IS_ERR(handle)) {
3771 /* Release dquot anyway to avoid endless cycle in dqput() */
3772 dquot_release(dquot);
3773 return PTR_ERR(handle);
3774 }
3775 ret = dquot_release(dquot);
3776 err = ext4_journal_stop(handle);
3777 if (!ret)
3778 ret = err;
3779 return ret;
3780 }
3781
3782 static int ext4_mark_dquot_dirty(struct dquot *dquot)
3783 {
3784 /* Are we journaling quotas? */
3785 if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
3786 EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
3787 dquot_mark_dquot_dirty(dquot);
3788 return ext4_write_dquot(dquot);
3789 } else {
3790 return dquot_mark_dquot_dirty(dquot);
3791 }
3792 }
3793
3794 static int ext4_write_info(struct super_block *sb, int type)
3795 {
3796 int ret, err;
3797 handle_t *handle;
3798
3799 /* Data block + inode block */
3800 handle = ext4_journal_start(sb->s_root->d_inode, 2);
3801 if (IS_ERR(handle))
3802 return PTR_ERR(handle);
3803 ret = dquot_commit_info(sb, type);
3804 err = ext4_journal_stop(handle);
3805 if (!ret)
3806 ret = err;
3807 return ret;
3808 }
3809
3810 /*
3811 * Turn on quotas during mount time - we need to find
3812 * the quota file and such...
3813 */
3814 static int ext4_quota_on_mount(struct super_block *sb, int type)
3815 {
3816 return vfs_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
3817 EXT4_SB(sb)->s_jquota_fmt, type);
3818 }
3819
3820 /*
3821 * Standard function to be called on quota_on
3822 */
3823 static int ext4_quota_on(struct super_block *sb, int type, int format_id,
3824 char *name, int remount)
3825 {
3826 int err;
3827 struct path path;
3828
3829 if (!test_opt(sb, QUOTA))
3830 return -EINVAL;
3831 /* When remounting, no checks are needed and in fact, name is NULL */
3832 if (remount)
3833 return vfs_quota_on(sb, type, format_id, name, remount);
3834
3835 err = kern_path(name, LOOKUP_FOLLOW, &path);
3836 if (err)
3837 return err;
3838
3839 /* Quotafile not on the same filesystem? */
3840 if (path.mnt->mnt_sb != sb) {
3841 path_put(&path);
3842 return -EXDEV;
3843 }
3844 /* Journaling quota? */
3845 if (EXT4_SB(sb)->s_qf_names[type]) {
3846 /* Quotafile not in fs root? */
3847 if (path.dentry->d_parent != sb->s_root)
3848 ext4_msg(sb, KERN_WARNING,
3849 "Quota file not on filesystem root. "
3850 "Journaled quota will not work");
3851 }
3852
3853 /*
3854 * When we journal data on quota file, we have to flush journal to see
3855 * all updates to the file when we bypass pagecache...
3856 */
3857 if (EXT4_SB(sb)->s_journal &&
3858 ext4_should_journal_data(path.dentry->d_inode)) {
3859 /*
3860 * We don't need to lock updates but journal_flush() could
3861 * otherwise be livelocked...
3862 */
3863 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
3864 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
3865 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
3866 if (err) {
3867 path_put(&path);
3868 return err;
3869 }
3870 }
3871
3872 err = vfs_quota_on_path(sb, type, format_id, &path);
3873 path_put(&path);
3874 return err;
3875 }
3876
3877 /* Read data from quotafile - avoid pagecache and such because we cannot afford
3878 * acquiring the locks... As quota files are never truncated and quota code
3879 * itself serializes the operations (and noone else should touch the files)
3880 * we don't have to be afraid of races */
3881 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
3882 size_t len, loff_t off)
3883 {
3884 struct inode *inode = sb_dqopt(sb)->files[type];
3885 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
3886 int err = 0;
3887 int offset = off & (sb->s_blocksize - 1);
3888 int tocopy;
3889 size_t toread;
3890 struct buffer_head *bh;
3891 loff_t i_size = i_size_read(inode);
3892
3893 if (off > i_size)
3894 return 0;
3895 if (off+len > i_size)
3896 len = i_size-off;
3897 toread = len;
3898 while (toread > 0) {
3899 tocopy = sb->s_blocksize - offset < toread ?
3900 sb->s_blocksize - offset : toread;
3901 bh = ext4_bread(NULL, inode, blk, 0, &err);
3902 if (err)
3903 return err;
3904 if (!bh) /* A hole? */
3905 memset(data, 0, tocopy);
3906 else
3907 memcpy(data, bh->b_data+offset, tocopy);
3908 brelse(bh);
3909 offset = 0;
3910 toread -= tocopy;
3911 data += tocopy;
3912 blk++;
3913 }
3914 return len;
3915 }
3916
3917 /* Write to quotafile (we know the transaction is already started and has
3918 * enough credits) */
3919 static ssize_t ext4_quota_write(struct super_block *sb, int type,
3920 const char *data, size_t len, loff_t off)
3921 {
3922 struct inode *inode = sb_dqopt(sb)->files[type];
3923 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
3924 int err = 0;
3925 int offset = off & (sb->s_blocksize - 1);
3926 int tocopy;
3927 int journal_quota = EXT4_SB(sb)->s_qf_names[type] != NULL;
3928 size_t towrite = len;
3929 struct buffer_head *bh;
3930 handle_t *handle = journal_current_handle();
3931
3932 if (EXT4_SB(sb)->s_journal && !handle) {
3933 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
3934 " cancelled because transaction is not started",
3935 (unsigned long long)off, (unsigned long long)len);
3936 return -EIO;
3937 }
3938 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
3939 while (towrite > 0) {
3940 tocopy = sb->s_blocksize - offset < towrite ?
3941 sb->s_blocksize - offset : towrite;
3942 bh = ext4_bread(handle, inode, blk, 1, &err);
3943 if (!bh)
3944 goto out;
3945 if (journal_quota) {
3946 err = ext4_journal_get_write_access(handle, bh);
3947 if (err) {
3948 brelse(bh);
3949 goto out;
3950 }
3951 }
3952 lock_buffer(bh);
3953 memcpy(bh->b_data+offset, data, tocopy);
3954 flush_dcache_page(bh->b_page);
3955 unlock_buffer(bh);
3956 if (journal_quota)
3957 err = ext4_handle_dirty_metadata(handle, NULL, bh);
3958 else {
3959 /* Always do at least ordered writes for quotas */
3960 err = ext4_jbd2_file_inode(handle, inode);
3961 mark_buffer_dirty(bh);
3962 }
3963 brelse(bh);
3964 if (err)
3965 goto out;
3966 offset = 0;
3967 towrite -= tocopy;
3968 data += tocopy;
3969 blk++;
3970 }
3971 out:
3972 if (len == towrite) {
3973 mutex_unlock(&inode->i_mutex);
3974 return err;
3975 }
3976 if (inode->i_size < off+len-towrite) {
3977 i_size_write(inode, off+len-towrite);
3978 EXT4_I(inode)->i_disksize = inode->i_size;
3979 }
3980 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
3981 ext4_mark_inode_dirty(handle, inode);
3982 mutex_unlock(&inode->i_mutex);
3983 return len - towrite;
3984 }
3985
3986 #endif
3987
3988 static int ext4_get_sb(struct file_system_type *fs_type, int flags,
3989 const char *dev_name, void *data, struct vfsmount *mnt)
3990 {
3991 return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super,mnt);
3992 }
3993
3994 static struct file_system_type ext4_fs_type = {
3995 .owner = THIS_MODULE,
3996 .name = "ext4",
3997 .get_sb = ext4_get_sb,
3998 .kill_sb = kill_block_super,
3999 .fs_flags = FS_REQUIRES_DEV,
4000 };
4001
4002 #ifdef CONFIG_EXT4DEV_COMPAT
4003 static int ext4dev_get_sb(struct file_system_type *fs_type, int flags,
4004 const char *dev_name, void *data,struct vfsmount *mnt)
4005 {
4006 printk(KERN_WARNING "EXT4-fs (%s): Update your userspace programs "
4007 "to mount using ext4\n", dev_name);
4008 printk(KERN_WARNING "EXT4-fs (%s): ext4dev backwards compatibility "
4009 "will go away by 2.6.31\n", dev_name);
4010 return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super,mnt);
4011 }
4012
4013 static struct file_system_type ext4dev_fs_type = {
4014 .owner = THIS_MODULE,
4015 .name = "ext4dev",
4016 .get_sb = ext4dev_get_sb,
4017 .kill_sb = kill_block_super,
4018 .fs_flags = FS_REQUIRES_DEV,
4019 };
4020 MODULE_ALIAS("ext4dev");
4021 #endif
4022
4023 static int __init init_ext4_fs(void)
4024 {
4025 int err;
4026
4027 err = init_ext4_system_zone();
4028 if (err)
4029 return err;
4030 ext4_kset = kset_create_and_add("ext4", NULL, fs_kobj);
4031 if (!ext4_kset)
4032 goto out4;
4033 ext4_proc_root = proc_mkdir("fs/ext4", NULL);
4034 err = init_ext4_mballoc();
4035 if (err)
4036 goto out3;
4037
4038 err = init_ext4_xattr();
4039 if (err)
4040 goto out2;
4041 err = init_inodecache();
4042 if (err)
4043 goto out1;
4044 err = register_filesystem(&ext4_fs_type);
4045 if (err)
4046 goto out;
4047 #ifdef CONFIG_EXT4DEV_COMPAT
4048 err = register_filesystem(&ext4dev_fs_type);
4049 if (err) {
4050 unregister_filesystem(&ext4_fs_type);
4051 goto out;
4052 }
4053 #endif
4054 return 0;
4055 out:
4056 destroy_inodecache();
4057 out1:
4058 exit_ext4_xattr();
4059 out2:
4060 exit_ext4_mballoc();
4061 out3:
4062 remove_proc_entry("fs/ext4", NULL);
4063 kset_unregister(ext4_kset);
4064 out4:
4065 exit_ext4_system_zone();
4066 return err;
4067 }
4068
4069 static void __exit exit_ext4_fs(void)
4070 {
4071 unregister_filesystem(&ext4_fs_type);
4072 #ifdef CONFIG_EXT4DEV_COMPAT
4073 unregister_filesystem(&ext4dev_fs_type);
4074 #endif
4075 destroy_inodecache();
4076 exit_ext4_xattr();
4077 exit_ext4_mballoc();
4078 remove_proc_entry("fs/ext4", NULL);
4079 kset_unregister(ext4_kset);
4080 exit_ext4_system_zone();
4081 }
4082
4083 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
4084 MODULE_DESCRIPTION("Fourth Extended Filesystem");
4085 MODULE_LICENSE("GPL");
4086 module_init(init_ext4_fs)
4087 module_exit(exit_ext4_fs)
Support for the Chinese Samsung S3C2440 based development boards