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checkpatch: version 0.21
[linux-2.6/btrfs-unstable.git] / fs / ext4 / super.c
blob1cb371dcd609aae5f115cf236acd4d0c66956efb
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/jbd2.h>
24 #include <linux/slab.h>
25 #include <linux/init.h>
26 #include <linux/blkdev.h>
27 #include <linux/parser.h>
28 #include <linux/smp_lock.h>
29 #include <linux/buffer_head.h>
30 #include <linux/exportfs.h>
31 #include <linux/vfs.h>
32 #include <linux/random.h>
33 #include <linux/mount.h>
34 #include <linux/namei.h>
35 #include <linux/quotaops.h>
36 #include <linux/seq_file.h>
37 #include <linux/log2.h>
38 #include <linux/crc16.h>
39 #include <asm/uaccess.h>
40
41 #include "ext4.h"
42 #include "ext4_jbd2.h"
43 #include "xattr.h"
44 #include "acl.h"
45 #include "namei.h"
46 #include "group.h"
47
48 static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
49 unsigned long journal_devnum);
50 static int ext4_create_journal(struct super_block *, struct ext4_super_block *,
51 unsigned int);
52 static void ext4_commit_super (struct super_block * sb,
53 struct ext4_super_block * es,
54 int sync);
55 static void ext4_mark_recovery_complete(struct super_block * sb,
56 struct ext4_super_block * es);
57 static void ext4_clear_journal_err(struct super_block * sb,
58 struct ext4_super_block * es);
59 static int ext4_sync_fs(struct super_block *sb, int wait);
60 static const char *ext4_decode_error(struct super_block * sb, int errno,
61 char nbuf[16]);
62 static int ext4_remount (struct super_block * sb, int * flags, char * data);
63 static int ext4_statfs (struct dentry * dentry, struct kstatfs * buf);
64 static void ext4_unlockfs(struct super_block *sb);
65 static void ext4_write_super (struct super_block * sb);
66 static void ext4_write_super_lockfs(struct super_block *sb);
67
68
69 ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
70 struct ext4_group_desc *bg)
71 {
72 return le32_to_cpu(bg->bg_block_bitmap_lo) |
73 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
74 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
75 }
76
77 ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
78 struct ext4_group_desc *bg)
79 {
80 return le32_to_cpu(bg->bg_inode_bitmap_lo) |
81 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
82 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
83 }
84
85 ext4_fsblk_t ext4_inode_table(struct super_block *sb,
86 struct ext4_group_desc *bg)
87 {
88 return le32_to_cpu(bg->bg_inode_table_lo) |
89 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
90 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
91 }
92
93 void ext4_block_bitmap_set(struct super_block *sb,
94 struct ext4_group_desc *bg, ext4_fsblk_t blk)
95 {
96 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
97 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
98 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
99 }
100
101 void ext4_inode_bitmap_set(struct super_block *sb,
102 struct ext4_group_desc *bg, ext4_fsblk_t blk)
103 {
104 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk);
105 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
106 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
107 }
108
109 void ext4_inode_table_set(struct super_block *sb,
110 struct ext4_group_desc *bg, ext4_fsblk_t blk)
111 {
112 bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
113 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
114 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
115 }
116
117 /*
118 * Wrappers for jbd2_journal_start/end.
119 *
120 * The only special thing we need to do here is to make sure that all
121 * journal_end calls result in the superblock being marked dirty, so
122 * that sync() will call the filesystem's write_super callback if
123 * appropriate.
124 */
125 handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks)
126 {
127 journal_t *journal;
128
129 if (sb->s_flags & MS_RDONLY)
130 return ERR_PTR(-EROFS);
131
132 /* Special case here: if the journal has aborted behind our
133 * backs (eg. EIO in the commit thread), then we still need to
134 * take the FS itself readonly cleanly. */
135 journal = EXT4_SB(sb)->s_journal;
136 if (is_journal_aborted(journal)) {
137 ext4_abort(sb, __func__,
138 "Detected aborted journal");
139 return ERR_PTR(-EROFS);
140 }
141
142 return jbd2_journal_start(journal, nblocks);
143 }
144
145 /*
146 * The only special thing we need to do here is to make sure that all
147 * jbd2_journal_stop calls result in the superblock being marked dirty, so
148 * that sync() will call the filesystem's write_super callback if
149 * appropriate.
150 */
151 int __ext4_journal_stop(const char *where, handle_t *handle)
152 {
153 struct super_block *sb;
154 int err;
155 int rc;
156
157 sb = handle->h_transaction->t_journal->j_private;
158 err = handle->h_err;
159 rc = jbd2_journal_stop(handle);
160
161 if (!err)
162 err = rc;
163 if (err)
164 __ext4_std_error(sb, where, err);
165 return err;
166 }
167
168 void ext4_journal_abort_handle(const char *caller, const char *err_fn,
169 struct buffer_head *bh, handle_t *handle, int err)
170 {
171 char nbuf[16];
172 const char *errstr = ext4_decode_error(NULL, err, nbuf);
173
174 if (bh)
175 BUFFER_TRACE(bh, "abort");
176
177 if (!handle->h_err)
178 handle->h_err = err;
179
180 if (is_handle_aborted(handle))
181 return;
182
183 printk(KERN_ERR "%s: aborting transaction: %s in %s\n",
184 caller, errstr, err_fn);
185
186 jbd2_journal_abort_handle(handle);
187 }
188
189 /* Deal with the reporting of failure conditions on a filesystem such as
190 * inconsistencies detected or read IO failures.
191 *
192 * On ext2, we can store the error state of the filesystem in the
193 * superblock. That is not possible on ext4, because we may have other
194 * write ordering constraints on the superblock which prevent us from
195 * writing it out straight away; and given that the journal is about to
196 * be aborted, we can't rely on the current, or future, transactions to
197 * write out the superblock safely.
198 *
199 * We'll just use the jbd2_journal_abort() error code to record an error in
200 * the journal instead. On recovery, the journal will compain about
201 * that error until we've noted it down and cleared it.
202 */
203
204 static void ext4_handle_error(struct super_block *sb)
205 {
206 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
207
208 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
209 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
210
211 if (sb->s_flags & MS_RDONLY)
212 return;
213
214 if (!test_opt (sb, ERRORS_CONT)) {
215 journal_t *journal = EXT4_SB(sb)->s_journal;
216
217 EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT;
218 if (journal)
219 jbd2_journal_abort(journal, -EIO);
220 }
221 if (test_opt (sb, ERRORS_RO)) {
222 printk (KERN_CRIT "Remounting filesystem read-only\n");
223 sb->s_flags |= MS_RDONLY;
224 }
225 ext4_commit_super(sb, es, 1);
226 if (test_opt(sb, ERRORS_PANIC))
227 panic("EXT4-fs (device %s): panic forced after error\n",
228 sb->s_id);
229 }
230
231 void ext4_error (struct super_block * sb, const char * function,
232 const char * fmt, ...)
233 {
234 va_list args;
235
236 va_start(args, fmt);
237 printk(KERN_CRIT "EXT4-fs error (device %s): %s: ",sb->s_id, function);
238 vprintk(fmt, args);
239 printk("\n");
240 va_end(args);
241
242 ext4_handle_error(sb);
243 }
244
245 static const char *ext4_decode_error(struct super_block * sb, int errno,
246 char nbuf[16])
247 {
248 char *errstr = NULL;
249
250 switch (errno) {
251 case -EIO:
252 errstr = "IO failure";
253 break;
254 case -ENOMEM:
255 errstr = "Out of memory";
256 break;
257 case -EROFS:
258 if (!sb || EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT)
259 errstr = "Journal has aborted";
260 else
261 errstr = "Readonly filesystem";
262 break;
263 default:
264 /* If the caller passed in an extra buffer for unknown
265 * errors, textualise them now. Else we just return
266 * NULL. */
267 if (nbuf) {
268 /* Check for truncated error codes... */
269 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
270 errstr = nbuf;
271 }
272 break;
273 }
274
275 return errstr;
276 }
277
278 /* __ext4_std_error decodes expected errors from journaling functions
279 * automatically and invokes the appropriate error response. */
280
281 void __ext4_std_error (struct super_block * sb, const char * function,
282 int errno)
283 {
284 char nbuf[16];
285 const char *errstr;
286
287 /* Special case: if the error is EROFS, and we're not already
288 * inside a transaction, then there's really no point in logging
289 * an error. */
290 if (errno == -EROFS && journal_current_handle() == NULL &&
291 (sb->s_flags & MS_RDONLY))
292 return;
293
294 errstr = ext4_decode_error(sb, errno, nbuf);
295 printk (KERN_CRIT "EXT4-fs error (device %s) in %s: %s\n",
296 sb->s_id, function, errstr);
297
298 ext4_handle_error(sb);
299 }
300
301 /*
302 * ext4_abort is a much stronger failure handler than ext4_error. The
303 * abort function may be used to deal with unrecoverable failures such
304 * as journal IO errors or ENOMEM at a critical moment in log management.
305 *
306 * We unconditionally force the filesystem into an ABORT|READONLY state,
307 * unless the error response on the fs has been set to panic in which
308 * case we take the easy way out and panic immediately.
309 */
310
311 void ext4_abort (struct super_block * sb, const char * function,
312 const char * fmt, ...)
313 {
314 va_list args;
315
316 printk (KERN_CRIT "ext4_abort called.\n");
317
318 va_start(args, fmt);
319 printk(KERN_CRIT "EXT4-fs error (device %s): %s: ",sb->s_id, function);
320 vprintk(fmt, args);
321 printk("\n");
322 va_end(args);
323
324 if (test_opt(sb, ERRORS_PANIC))
325 panic("EXT4-fs panic from previous error\n");
326
327 if (sb->s_flags & MS_RDONLY)
328 return;
329
330 printk(KERN_CRIT "Remounting filesystem read-only\n");
331 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
332 sb->s_flags |= MS_RDONLY;
333 EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT;
334 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
335 }
336
337 void ext4_warning (struct super_block * sb, const char * function,
338 const char * fmt, ...)
339 {
340 va_list args;
341
342 va_start(args, fmt);
343 printk(KERN_WARNING "EXT4-fs warning (device %s): %s: ",
344 sb->s_id, function);
345 vprintk(fmt, args);
346 printk("\n");
347 va_end(args);
348 }
349
350 void ext4_update_dynamic_rev(struct super_block *sb)
351 {
352 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
353
354 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
355 return;
356
357 ext4_warning(sb, __func__,
358 "updating to rev %d because of new feature flag, "
359 "running e2fsck is recommended",
360 EXT4_DYNAMIC_REV);
361
362 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
363 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
364 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
365 /* leave es->s_feature_*compat flags alone */
366 /* es->s_uuid will be set by e2fsck if empty */
367
368 /*
369 * The rest of the superblock fields should be zero, and if not it
370 * means they are likely already in use, so leave them alone. We
371 * can leave it up to e2fsck to clean up any inconsistencies there.
372 */
373 }
374
375 int ext4_update_compat_feature(handle_t *handle,
376 struct super_block *sb, __u32 compat)
377 {
378 int err = 0;
379 if (!EXT4_HAS_COMPAT_FEATURE(sb, compat)) {
380 err = ext4_journal_get_write_access(handle,
381 EXT4_SB(sb)->s_sbh);
382 if (err)
383 return err;
384 EXT4_SET_COMPAT_FEATURE(sb, compat);
385 sb->s_dirt = 1;
386 handle->h_sync = 1;
387 BUFFER_TRACE(EXT4_SB(sb)->s_sbh,
388 "call ext4_journal_dirty_met adata");
389 err = ext4_journal_dirty_metadata(handle,
390 EXT4_SB(sb)->s_sbh);
391 }
392 return err;
393 }
394
395 int ext4_update_rocompat_feature(handle_t *handle,
396 struct super_block *sb, __u32 rocompat)
397 {
398 int err = 0;
399 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, rocompat)) {
400 err = ext4_journal_get_write_access(handle,
401 EXT4_SB(sb)->s_sbh);
402 if (err)
403 return err;
404 EXT4_SET_RO_COMPAT_FEATURE(sb, rocompat);
405 sb->s_dirt = 1;
406 handle->h_sync = 1;
407 BUFFER_TRACE(EXT4_SB(sb)->s_sbh,
408 "call ext4_journal_dirty_met adata");
409 err = ext4_journal_dirty_metadata(handle,
410 EXT4_SB(sb)->s_sbh);
411 }
412 return err;
413 }
414
415 int ext4_update_incompat_feature(handle_t *handle,
416 struct super_block *sb, __u32 incompat)
417 {
418 int err = 0;
419 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, incompat)) {
420 err = ext4_journal_get_write_access(handle,
421 EXT4_SB(sb)->s_sbh);
422 if (err)
423 return err;
424 EXT4_SET_INCOMPAT_FEATURE(sb, incompat);
425 sb->s_dirt = 1;
426 handle->h_sync = 1;
427 BUFFER_TRACE(EXT4_SB(sb)->s_sbh,
428 "call ext4_journal_dirty_met adata");
429 err = ext4_journal_dirty_metadata(handle,
430 EXT4_SB(sb)->s_sbh);
431 }
432 return err;
433 }
434
435 /*
436 * Open the external journal device
437 */
438 static struct block_device *ext4_blkdev_get(dev_t dev)
439 {
440 struct block_device *bdev;
441 char b[BDEVNAME_SIZE];
442
443 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
444 if (IS_ERR(bdev))
445 goto fail;
446 return bdev;
447
448 fail:
449 printk(KERN_ERR "EXT4: failed to open journal device %s: %ld\n",
450 __bdevname(dev, b), PTR_ERR(bdev));
451 return NULL;
452 }
453
454 /*
455 * Release the journal device
456 */
457 static int ext4_blkdev_put(struct block_device *bdev)
458 {
459 bd_release(bdev);
460 return blkdev_put(bdev);
461 }
462
463 static int ext4_blkdev_remove(struct ext4_sb_info *sbi)
464 {
465 struct block_device *bdev;
466 int ret = -ENODEV;
467
468 bdev = sbi->journal_bdev;
469 if (bdev) {
470 ret = ext4_blkdev_put(bdev);
471 sbi->journal_bdev = NULL;
472 }
473 return ret;
474 }
475
476 static inline struct inode *orphan_list_entry(struct list_head *l)
477 {
478 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
479 }
480
481 static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
482 {
483 struct list_head *l;
484
485 printk(KERN_ERR "sb orphan head is %d\n",
486 le32_to_cpu(sbi->s_es->s_last_orphan));
487
488 printk(KERN_ERR "sb_info orphan list:\n");
489 list_for_each(l, &sbi->s_orphan) {
490 struct inode *inode = orphan_list_entry(l);
491 printk(KERN_ERR " "
492 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
493 inode->i_sb->s_id, inode->i_ino, inode,
494 inode->i_mode, inode->i_nlink,
495 NEXT_ORPHAN(inode));
496 }
497 }
498
499 static void ext4_put_super (struct super_block * sb)
500 {
501 struct ext4_sb_info *sbi = EXT4_SB(sb);
502 struct ext4_super_block *es = sbi->s_es;
503 int i;
504
505 ext4_mb_release(sb);
506 ext4_ext_release(sb);
507 ext4_xattr_put_super(sb);
508 jbd2_journal_destroy(sbi->s_journal);
509 sbi->s_journal = NULL;
510 if (!(sb->s_flags & MS_RDONLY)) {
511 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
512 es->s_state = cpu_to_le16(sbi->s_mount_state);
513 BUFFER_TRACE(sbi->s_sbh, "marking dirty");
514 mark_buffer_dirty(sbi->s_sbh);
515 ext4_commit_super(sb, es, 1);
516 }
517
518 for (i = 0; i < sbi->s_gdb_count; i++)
519 brelse(sbi->s_group_desc[i]);
520 kfree(sbi->s_group_desc);
521 kfree(sbi->s_flex_groups);
522 percpu_counter_destroy(&sbi->s_freeblocks_counter);
523 percpu_counter_destroy(&sbi->s_freeinodes_counter);
524 percpu_counter_destroy(&sbi->s_dirs_counter);
525 brelse(sbi->s_sbh);
526 #ifdef CONFIG_QUOTA
527 for (i = 0; i < MAXQUOTAS; i++)
528 kfree(sbi->s_qf_names[i]);
529 #endif
530
531 /* Debugging code just in case the in-memory inode orphan list
532 * isn't empty. The on-disk one can be non-empty if we've
533 * detected an error and taken the fs readonly, but the
534 * in-memory list had better be clean by this point. */
535 if (!list_empty(&sbi->s_orphan))
536 dump_orphan_list(sb, sbi);
537 J_ASSERT(list_empty(&sbi->s_orphan));
538
539 invalidate_bdev(sb->s_bdev);
540 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
541 /*
542 * Invalidate the journal device's buffers. We don't want them
543 * floating about in memory - the physical journal device may
544 * hotswapped, and it breaks the `ro-after' testing code.
545 */
546 sync_blockdev(sbi->journal_bdev);
547 invalidate_bdev(sbi->journal_bdev);
548 ext4_blkdev_remove(sbi);
549 }
550 sb->s_fs_info = NULL;
551 kfree(sbi);
552 return;
553 }
554
555 static struct kmem_cache *ext4_inode_cachep;
556
557 /*
558 * Called inside transaction, so use GFP_NOFS
559 */
560 static struct inode *ext4_alloc_inode(struct super_block *sb)
561 {
562 struct ext4_inode_info *ei;
563
564 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
565 if (!ei)
566 return NULL;
567 #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
568 ei->i_acl = EXT4_ACL_NOT_CACHED;
569 ei->i_default_acl = EXT4_ACL_NOT_CACHED;
570 #endif
571 ei->i_block_alloc_info = NULL;
572 ei->vfs_inode.i_version = 1;
573 memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache));
574 INIT_LIST_HEAD(&ei->i_prealloc_list);
575 spin_lock_init(&ei->i_prealloc_lock);
576 jbd2_journal_init_jbd_inode(&ei->jinode, &ei->vfs_inode);
577 ei->i_reserved_data_blocks = 0;
578 ei->i_reserved_meta_blocks = 0;
579 ei->i_allocated_meta_blocks = 0;
580 ei->i_delalloc_reserved_flag = 0;
581 spin_lock_init(&(ei->i_block_reservation_lock));
582 return &ei->vfs_inode;
583 }
584
585 static void ext4_destroy_inode(struct inode *inode)
586 {
587 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
588 printk("EXT4 Inode %p: orphan list check failed!\n",
589 EXT4_I(inode));
590 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
591 EXT4_I(inode), sizeof(struct ext4_inode_info),
592 true);
593 dump_stack();
594 }
595 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
596 }
597
598 static void init_once(struct kmem_cache *cachep, void *foo)
599 {
600 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
601
602 INIT_LIST_HEAD(&ei->i_orphan);
603 #ifdef CONFIG_EXT4DEV_FS_XATTR
604 init_rwsem(&ei->xattr_sem);
605 #endif
606 init_rwsem(&ei->i_data_sem);
607 inode_init_once(&ei->vfs_inode);
608 }
609
610 static int init_inodecache(void)
611 {
612 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
613 sizeof(struct ext4_inode_info),
614 0, (SLAB_RECLAIM_ACCOUNT|
615 SLAB_MEM_SPREAD),
616 init_once);
617 if (ext4_inode_cachep == NULL)
618 return -ENOMEM;
619 return 0;
620 }
621
622 static void destroy_inodecache(void)
623 {
624 kmem_cache_destroy(ext4_inode_cachep);
625 }
626
627 static void ext4_clear_inode(struct inode *inode)
628 {
629 struct ext4_block_alloc_info *rsv = EXT4_I(inode)->i_block_alloc_info;
630 #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
631 if (EXT4_I(inode)->i_acl &&
632 EXT4_I(inode)->i_acl != EXT4_ACL_NOT_CACHED) {
633 posix_acl_release(EXT4_I(inode)->i_acl);
634 EXT4_I(inode)->i_acl = EXT4_ACL_NOT_CACHED;
635 }
636 if (EXT4_I(inode)->i_default_acl &&
637 EXT4_I(inode)->i_default_acl != EXT4_ACL_NOT_CACHED) {
638 posix_acl_release(EXT4_I(inode)->i_default_acl);
639 EXT4_I(inode)->i_default_acl = EXT4_ACL_NOT_CACHED;
640 }
641 #endif
642 ext4_discard_reservation(inode);
643 EXT4_I(inode)->i_block_alloc_info = NULL;
644 if (unlikely(rsv))
645 kfree(rsv);
646 jbd2_journal_release_jbd_inode(EXT4_SB(inode->i_sb)->s_journal,
647 &EXT4_I(inode)->jinode);
648 }
649
650 static inline void ext4_show_quota_options(struct seq_file *seq, struct super_block *sb)
651 {
652 #if defined(CONFIG_QUOTA)
653 struct ext4_sb_info *sbi = EXT4_SB(sb);
654
655 if (sbi->s_jquota_fmt)
656 seq_printf(seq, ",jqfmt=%s",
657 (sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold": "vfsv0");
658
659 if (sbi->s_qf_names[USRQUOTA])
660 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
661
662 if (sbi->s_qf_names[GRPQUOTA])
663 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
664
665 if (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA)
666 seq_puts(seq, ",usrquota");
667
668 if (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)
669 seq_puts(seq, ",grpquota");
670 #endif
671 }
672
673 /*
674 * Show an option if
675 * - it's set to a non-default value OR
676 * - if the per-sb default is different from the global default
677 */
678 static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs)
679 {
680 int def_errors;
681 unsigned long def_mount_opts;
682 struct super_block *sb = vfs->mnt_sb;
683 struct ext4_sb_info *sbi = EXT4_SB(sb);
684 struct ext4_super_block *es = sbi->s_es;
685
686 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
687 def_errors = le16_to_cpu(es->s_errors);
688
689 if (sbi->s_sb_block != 1)
690 seq_printf(seq, ",sb=%llu", sbi->s_sb_block);
691 if (test_opt(sb, MINIX_DF))
692 seq_puts(seq, ",minixdf");
693 if (test_opt(sb, GRPID) && !(def_mount_opts & EXT4_DEFM_BSDGROUPS))
694 seq_puts(seq, ",grpid");
695 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT4_DEFM_BSDGROUPS))
696 seq_puts(seq, ",nogrpid");
697 if (sbi->s_resuid != EXT4_DEF_RESUID ||
698 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID) {
699 seq_printf(seq, ",resuid=%u", sbi->s_resuid);
700 }
701 if (sbi->s_resgid != EXT4_DEF_RESGID ||
702 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID) {
703 seq_printf(seq, ",resgid=%u", sbi->s_resgid);
704 }
705 if (test_opt(sb, ERRORS_RO)) {
706 if (def_errors == EXT4_ERRORS_PANIC ||
707 def_errors == EXT4_ERRORS_CONTINUE) {
708 seq_puts(seq, ",errors=remount-ro");
709 }
710 }
711 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
712 seq_puts(seq, ",errors=continue");
713 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
714 seq_puts(seq, ",errors=panic");
715 if (test_opt(sb, NO_UID32) && !(def_mount_opts & EXT4_DEFM_UID16))
716 seq_puts(seq, ",nouid32");
717 if (test_opt(sb, DEBUG) && !(def_mount_opts & EXT4_DEFM_DEBUG))
718 seq_puts(seq, ",debug");
719 if (test_opt(sb, OLDALLOC))
720 seq_puts(seq, ",oldalloc");
721 #ifdef CONFIG_EXT4DEV_FS_XATTR
722 if (test_opt(sb, XATTR_USER) &&
723 !(def_mount_opts & EXT4_DEFM_XATTR_USER))
724 seq_puts(seq, ",user_xattr");
725 if (!test_opt(sb, XATTR_USER) &&
726 (def_mount_opts & EXT4_DEFM_XATTR_USER)) {
727 seq_puts(seq, ",nouser_xattr");
728 }
729 #endif
730 #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
731 if (test_opt(sb, POSIX_ACL) && !(def_mount_opts & EXT4_DEFM_ACL))
732 seq_puts(seq, ",acl");
733 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT4_DEFM_ACL))
734 seq_puts(seq, ",noacl");
735 #endif
736 if (!test_opt(sb, RESERVATION))
737 seq_puts(seq, ",noreservation");
738 if (sbi->s_commit_interval) {
739 seq_printf(seq, ",commit=%u",
740 (unsigned) (sbi->s_commit_interval / HZ));
741 }
742 /*
743 * We're changing the default of barrier mount option, so
744 * let's always display its mount state so it's clear what its
745 * status is.
746 */
747 seq_puts(seq, ",barrier=");
748 seq_puts(seq, test_opt(sb, BARRIER) ? "1" : "0");
749 if (test_opt(sb, JOURNAL_ASYNC_COMMIT))
750 seq_puts(seq, ",journal_async_commit");
751 if (test_opt(sb, NOBH))
752 seq_puts(seq, ",nobh");
753 if (!test_opt(sb, EXTENTS))
754 seq_puts(seq, ",noextents");
755 if (!test_opt(sb, MBALLOC))
756 seq_puts(seq, ",nomballoc");
757 if (test_opt(sb, I_VERSION))
758 seq_puts(seq, ",i_version");
759 if (!test_opt(sb, DELALLOC))
760 seq_puts(seq, ",nodelalloc");
761
762
763 if (sbi->s_stripe)
764 seq_printf(seq, ",stripe=%lu", sbi->s_stripe);
765 /*
766 * journal mode get enabled in different ways
767 * So just print the value even if we didn't specify it
768 */
769 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
770 seq_puts(seq, ",data=journal");
771 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
772 seq_puts(seq, ",data=ordered");
773 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
774 seq_puts(seq, ",data=writeback");
775
776 ext4_show_quota_options(seq, sb);
777 return 0;
778 }
779
780
781 static struct inode *ext4_nfs_get_inode(struct super_block *sb,
782 u64 ino, u32 generation)
783 {
784 struct inode *inode;
785
786 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
787 return ERR_PTR(-ESTALE);
788 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
789 return ERR_PTR(-ESTALE);
790
791 /* iget isn't really right if the inode is currently unallocated!!
792 *
793 * ext4_read_inode will return a bad_inode if the inode had been
794 * deleted, so we should be safe.
795 *
796 * Currently we don't know the generation for parent directory, so
797 * a generation of 0 means "accept any"
798 */
799 inode = ext4_iget(sb, ino);
800 if (IS_ERR(inode))
801 return ERR_CAST(inode);
802 if (generation && inode->i_generation != generation) {
803 iput(inode);
804 return ERR_PTR(-ESTALE);
805 }
806
807 return inode;
808 }
809
810 static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
811 int fh_len, int fh_type)
812 {
813 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
814 ext4_nfs_get_inode);
815 }
816
817 static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
818 int fh_len, int fh_type)
819 {
820 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
821 ext4_nfs_get_inode);
822 }
823
824 #ifdef CONFIG_QUOTA
825 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
826 #define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
827
828 static int ext4_dquot_initialize(struct inode *inode, int type);
829 static int ext4_dquot_drop(struct inode *inode);
830 static int ext4_write_dquot(struct dquot *dquot);
831 static int ext4_acquire_dquot(struct dquot *dquot);
832 static int ext4_release_dquot(struct dquot *dquot);
833 static int ext4_mark_dquot_dirty(struct dquot *dquot);
834 static int ext4_write_info(struct super_block *sb, int type);
835 static int ext4_quota_on(struct super_block *sb, int type, int format_id,
836 char *path, int remount);
837 static int ext4_quota_on_mount(struct super_block *sb, int type);
838 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
839 size_t len, loff_t off);
840 static ssize_t ext4_quota_write(struct super_block *sb, int type,
841 const char *data, size_t len, loff_t off);
842
843 static struct dquot_operations ext4_quota_operations = {
844 .initialize = ext4_dquot_initialize,
845 .drop = ext4_dquot_drop,
846 .alloc_space = dquot_alloc_space,
847 .alloc_inode = dquot_alloc_inode,
848 .free_space = dquot_free_space,
849 .free_inode = dquot_free_inode,
850 .transfer = dquot_transfer,
851 .write_dquot = ext4_write_dquot,
852 .acquire_dquot = ext4_acquire_dquot,
853 .release_dquot = ext4_release_dquot,
854 .mark_dirty = ext4_mark_dquot_dirty,
855 .write_info = ext4_write_info
856 };
857
858 static struct quotactl_ops ext4_qctl_operations = {
859 .quota_on = ext4_quota_on,
860 .quota_off = vfs_quota_off,
861 .quota_sync = vfs_quota_sync,
862 .get_info = vfs_get_dqinfo,
863 .set_info = vfs_set_dqinfo,
864 .get_dqblk = vfs_get_dqblk,
865 .set_dqblk = vfs_set_dqblk
866 };
867 #endif
868
869 static const struct super_operations ext4_sops = {
870 .alloc_inode = ext4_alloc_inode,
871 .destroy_inode = ext4_destroy_inode,
872 .write_inode = ext4_write_inode,
873 .dirty_inode = ext4_dirty_inode,
874 .delete_inode = ext4_delete_inode,
875 .put_super = ext4_put_super,
876 .write_super = ext4_write_super,
877 .sync_fs = ext4_sync_fs,
878 .write_super_lockfs = ext4_write_super_lockfs,
879 .unlockfs = ext4_unlockfs,
880 .statfs = ext4_statfs,
881 .remount_fs = ext4_remount,
882 .clear_inode = ext4_clear_inode,
883 .show_options = ext4_show_options,
884 #ifdef CONFIG_QUOTA
885 .quota_read = ext4_quota_read,
886 .quota_write = ext4_quota_write,
887 #endif
888 };
889
890 static const struct export_operations ext4_export_ops = {
891 .fh_to_dentry = ext4_fh_to_dentry,
892 .fh_to_parent = ext4_fh_to_parent,
893 .get_parent = ext4_get_parent,
894 };
895
896 enum {
897 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
898 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
899 Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
900 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
901 Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh,
902 Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
903 Opt_journal_checksum, Opt_journal_async_commit,
904 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
905 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
906 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota,
907 Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota,
908 Opt_grpquota, Opt_extents, Opt_noextents, Opt_i_version,
909 Opt_mballoc, Opt_nomballoc, Opt_stripe, Opt_delalloc, Opt_nodelalloc,
910 };
911
912 static match_table_t tokens = {
913 {Opt_bsd_df, "bsddf"},
914 {Opt_minix_df, "minixdf"},
915 {Opt_grpid, "grpid"},
916 {Opt_grpid, "bsdgroups"},
917 {Opt_nogrpid, "nogrpid"},
918 {Opt_nogrpid, "sysvgroups"},
919 {Opt_resgid, "resgid=%u"},
920 {Opt_resuid, "resuid=%u"},
921 {Opt_sb, "sb=%u"},
922 {Opt_err_cont, "errors=continue"},
923 {Opt_err_panic, "errors=panic"},
924 {Opt_err_ro, "errors=remount-ro"},
925 {Opt_nouid32, "nouid32"},
926 {Opt_nocheck, "nocheck"},
927 {Opt_nocheck, "check=none"},
928 {Opt_debug, "debug"},
929 {Opt_oldalloc, "oldalloc"},
930 {Opt_orlov, "orlov"},
931 {Opt_user_xattr, "user_xattr"},
932 {Opt_nouser_xattr, "nouser_xattr"},
933 {Opt_acl, "acl"},
934 {Opt_noacl, "noacl"},
935 {Opt_reservation, "reservation"},
936 {Opt_noreservation, "noreservation"},
937 {Opt_noload, "noload"},
938 {Opt_nobh, "nobh"},
939 {Opt_bh, "bh"},
940 {Opt_commit, "commit=%u"},
941 {Opt_journal_update, "journal=update"},
942 {Opt_journal_inum, "journal=%u"},
943 {Opt_journal_dev, "journal_dev=%u"},
944 {Opt_journal_checksum, "journal_checksum"},
945 {Opt_journal_async_commit, "journal_async_commit"},
946 {Opt_abort, "abort"},
947 {Opt_data_journal, "data=journal"},
948 {Opt_data_ordered, "data=ordered"},
949 {Opt_data_writeback, "data=writeback"},
950 {Opt_offusrjquota, "usrjquota="},
951 {Opt_usrjquota, "usrjquota=%s"},
952 {Opt_offgrpjquota, "grpjquota="},
953 {Opt_grpjquota, "grpjquota=%s"},
954 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
955 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
956 {Opt_grpquota, "grpquota"},
957 {Opt_noquota, "noquota"},
958 {Opt_quota, "quota"},
959 {Opt_usrquota, "usrquota"},
960 {Opt_barrier, "barrier=%u"},
961 {Opt_extents, "extents"},
962 {Opt_noextents, "noextents"},
963 {Opt_i_version, "i_version"},
964 {Opt_mballoc, "mballoc"},
965 {Opt_nomballoc, "nomballoc"},
966 {Opt_stripe, "stripe=%u"},
967 {Opt_resize, "resize"},
968 {Opt_delalloc, "delalloc"},
969 {Opt_nodelalloc, "nodelalloc"},
970 {Opt_err, NULL},
971 };
972
973 static ext4_fsblk_t get_sb_block(void **data)
974 {
975 ext4_fsblk_t sb_block;
976 char *options = (char *) *data;
977
978 if (!options || strncmp(options, "sb=", 3) != 0)
979 return 1; /* Default location */
980 options += 3;
981 /*todo: use simple_strtoll with >32bit ext4 */
982 sb_block = simple_strtoul(options, &options, 0);
983 if (*options && *options != ',') {
984 printk("EXT4-fs: Invalid sb specification: %s\n",
985 (char *) *data);
986 return 1;
987 }
988 if (*options == ',')
989 options++;
990 *data = (void *) options;
991 return sb_block;
992 }
993
994 static int parse_options (char *options, struct super_block *sb,
995 unsigned int *inum, unsigned long *journal_devnum,
996 ext4_fsblk_t *n_blocks_count, int is_remount)
997 {
998 struct ext4_sb_info *sbi = EXT4_SB(sb);
999 char * p;
1000 substring_t args[MAX_OPT_ARGS];
1001 int data_opt = 0;
1002 int option;
1003 #ifdef CONFIG_QUOTA
1004 int qtype, qfmt;
1005 char *qname;
1006 #endif
1007 ext4_fsblk_t last_block;
1008
1009 if (!options)
1010 return 1;
1011
1012 while ((p = strsep (&options, ",")) != NULL) {
1013 int token;
1014 if (!*p)
1015 continue;
1016
1017 token = match_token(p, tokens, args);
1018 switch (token) {
1019 case Opt_bsd_df:
1020 clear_opt (sbi->s_mount_opt, MINIX_DF);
1021 break;
1022 case Opt_minix_df:
1023 set_opt (sbi->s_mount_opt, MINIX_DF);
1024 break;
1025 case Opt_grpid:
1026 set_opt (sbi->s_mount_opt, GRPID);
1027 break;
1028 case Opt_nogrpid:
1029 clear_opt (sbi->s_mount_opt, GRPID);
1030 break;
1031 case Opt_resuid:
1032 if (match_int(&args[0], &option))
1033 return 0;
1034 sbi->s_resuid = option;
1035 break;
1036 case Opt_resgid:
1037 if (match_int(&args[0], &option))
1038 return 0;
1039 sbi->s_resgid = option;
1040 break;
1041 case Opt_sb:
1042 /* handled by get_sb_block() instead of here */
1043 /* *sb_block = match_int(&args[0]); */
1044 break;
1045 case Opt_err_panic:
1046 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
1047 clear_opt (sbi->s_mount_opt, ERRORS_RO);
1048 set_opt (sbi->s_mount_opt, ERRORS_PANIC);
1049 break;
1050 case Opt_err_ro:
1051 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
1052 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
1053 set_opt (sbi->s_mount_opt, ERRORS_RO);
1054 break;
1055 case Opt_err_cont:
1056 clear_opt (sbi->s_mount_opt, ERRORS_RO);
1057 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
1058 set_opt (sbi->s_mount_opt, ERRORS_CONT);
1059 break;
1060 case Opt_nouid32:
1061 set_opt (sbi->s_mount_opt, NO_UID32);
1062 break;
1063 case Opt_nocheck:
1064 clear_opt (sbi->s_mount_opt, CHECK);
1065 break;
1066 case Opt_debug:
1067 set_opt (sbi->s_mount_opt, DEBUG);
1068 break;
1069 case Opt_oldalloc:
1070 set_opt (sbi->s_mount_opt, OLDALLOC);
1071 break;
1072 case Opt_orlov:
1073 clear_opt (sbi->s_mount_opt, OLDALLOC);
1074 break;
1075 #ifdef CONFIG_EXT4DEV_FS_XATTR
1076 case Opt_user_xattr:
1077 set_opt (sbi->s_mount_opt, XATTR_USER);
1078 break;
1079 case Opt_nouser_xattr:
1080 clear_opt (sbi->s_mount_opt, XATTR_USER);
1081 break;
1082 #else
1083 case Opt_user_xattr:
1084 case Opt_nouser_xattr:
1085 printk("EXT4 (no)user_xattr options not supported\n");
1086 break;
1087 #endif
1088 #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
1089 case Opt_acl:
1090 set_opt(sbi->s_mount_opt, POSIX_ACL);
1091 break;
1092 case Opt_noacl:
1093 clear_opt(sbi->s_mount_opt, POSIX_ACL);
1094 break;
1095 #else
1096 case Opt_acl:
1097 case Opt_noacl:
1098 printk("EXT4 (no)acl options not supported\n");
1099 break;
1100 #endif
1101 case Opt_reservation:
1102 set_opt(sbi->s_mount_opt, RESERVATION);
1103 break;
1104 case Opt_noreservation:
1105 clear_opt(sbi->s_mount_opt, RESERVATION);
1106 break;
1107 case Opt_journal_update:
1108 /* @@@ FIXME */
1109 /* Eventually we will want to be able to create
1110 a journal file here. For now, only allow the
1111 user to specify an existing inode to be the
1112 journal file. */
1113 if (is_remount) {
1114 printk(KERN_ERR "EXT4-fs: cannot specify "
1115 "journal on remount\n");
1116 return 0;
1117 }
1118 set_opt (sbi->s_mount_opt, UPDATE_JOURNAL);
1119 break;
1120 case Opt_journal_inum:
1121 if (is_remount) {
1122 printk(KERN_ERR "EXT4-fs: cannot specify "
1123 "journal on remount\n");
1124 return 0;
1125 }
1126 if (match_int(&args[0], &option))
1127 return 0;
1128 *inum = option;
1129 break;
1130 case Opt_journal_dev:
1131 if (is_remount) {
1132 printk(KERN_ERR "EXT4-fs: cannot specify "
1133 "journal on remount\n");
1134 return 0;
1135 }
1136 if (match_int(&args[0], &option))
1137 return 0;
1138 *journal_devnum = option;
1139 break;
1140 case Opt_journal_checksum:
1141 set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM);
1142 break;
1143 case Opt_journal_async_commit:
1144 set_opt(sbi->s_mount_opt, JOURNAL_ASYNC_COMMIT);
1145 set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM);
1146 break;
1147 case Opt_noload:
1148 set_opt (sbi->s_mount_opt, NOLOAD);
1149 break;
1150 case Opt_commit:
1151 if (match_int(&args[0], &option))
1152 return 0;
1153 if (option < 0)
1154 return 0;
1155 if (option == 0)
1156 option = JBD2_DEFAULT_MAX_COMMIT_AGE;
1157 sbi->s_commit_interval = HZ * option;
1158 break;
1159 case Opt_data_journal:
1160 data_opt = EXT4_MOUNT_JOURNAL_DATA;
1161 goto datacheck;
1162 case Opt_data_ordered:
1163 data_opt = EXT4_MOUNT_ORDERED_DATA;
1164 goto datacheck;
1165 case Opt_data_writeback:
1166 data_opt = EXT4_MOUNT_WRITEBACK_DATA;
1167 datacheck:
1168 if (is_remount) {
1169 if ((sbi->s_mount_opt & EXT4_MOUNT_DATA_FLAGS)
1170 != data_opt) {
1171 printk(KERN_ERR
1172 "EXT4-fs: cannot change data "
1173 "mode on remount\n");
1174 return 0;
1175 }
1176 } else {
1177 sbi->s_mount_opt &= ~EXT4_MOUNT_DATA_FLAGS;
1178 sbi->s_mount_opt |= data_opt;
1179 }
1180 break;
1181 #ifdef CONFIG_QUOTA
1182 case Opt_usrjquota:
1183 qtype = USRQUOTA;
1184 goto set_qf_name;
1185 case Opt_grpjquota:
1186 qtype = GRPQUOTA;
1187 set_qf_name:
1188 if ((sb_any_quota_enabled(sb) ||
1189 sb_any_quota_suspended(sb)) &&
1190 !sbi->s_qf_names[qtype]) {
1191 printk(KERN_ERR
1192 "EXT4-fs: Cannot change journaled "
1193 "quota options when quota turned on.\n");
1194 return 0;
1195 }
1196 qname = match_strdup(&args[0]);
1197 if (!qname) {
1198 printk(KERN_ERR
1199 "EXT4-fs: not enough memory for "
1200 "storing quotafile name.\n");
1201 return 0;
1202 }
1203 if (sbi->s_qf_names[qtype] &&
1204 strcmp(sbi->s_qf_names[qtype], qname)) {
1205 printk(KERN_ERR
1206 "EXT4-fs: %s quota file already "
1207 "specified.\n", QTYPE2NAME(qtype));
1208 kfree(qname);
1209 return 0;
1210 }
1211 sbi->s_qf_names[qtype] = qname;
1212 if (strchr(sbi->s_qf_names[qtype], '/')) {
1213 printk(KERN_ERR
1214 "EXT4-fs: quotafile must be on "
1215 "filesystem root.\n");
1216 kfree(sbi->s_qf_names[qtype]);
1217 sbi->s_qf_names[qtype] = NULL;
1218 return 0;
1219 }
1220 set_opt(sbi->s_mount_opt, QUOTA);
1221 break;
1222 case Opt_offusrjquota:
1223 qtype = USRQUOTA;
1224 goto clear_qf_name;
1225 case Opt_offgrpjquota:
1226 qtype = GRPQUOTA;
1227 clear_qf_name:
1228 if ((sb_any_quota_enabled(sb) ||
1229 sb_any_quota_suspended(sb)) &&
1230 sbi->s_qf_names[qtype]) {
1231 printk(KERN_ERR "EXT4-fs: Cannot change "
1232 "journaled quota options when "
1233 "quota turned on.\n");
1234 return 0;
1235 }
1236 /*
1237 * The space will be released later when all options
1238 * are confirmed to be correct
1239 */
1240 sbi->s_qf_names[qtype] = NULL;
1241 break;
1242 case Opt_jqfmt_vfsold:
1243 qfmt = QFMT_VFS_OLD;
1244 goto set_qf_format;
1245 case Opt_jqfmt_vfsv0:
1246 qfmt = QFMT_VFS_V0;
1247 set_qf_format:
1248 if ((sb_any_quota_enabled(sb) ||
1249 sb_any_quota_suspended(sb)) &&
1250 sbi->s_jquota_fmt != qfmt) {
1251 printk(KERN_ERR "EXT4-fs: Cannot change "
1252 "journaled quota options when "
1253 "quota turned on.\n");
1254 return 0;
1255 }
1256 sbi->s_jquota_fmt = qfmt;
1257 break;
1258 case Opt_quota:
1259 case Opt_usrquota:
1260 set_opt(sbi->s_mount_opt, QUOTA);
1261 set_opt(sbi->s_mount_opt, USRQUOTA);
1262 break;
1263 case Opt_grpquota:
1264 set_opt(sbi->s_mount_opt, QUOTA);
1265 set_opt(sbi->s_mount_opt, GRPQUOTA);
1266 break;
1267 case Opt_noquota:
1268 if (sb_any_quota_enabled(sb)) {
1269 printk(KERN_ERR "EXT4-fs: Cannot change quota "
1270 "options when quota turned on.\n");
1271 return 0;
1272 }
1273 clear_opt(sbi->s_mount_opt, QUOTA);
1274 clear_opt(sbi->s_mount_opt, USRQUOTA);
1275 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1276 break;
1277 #else
1278 case Opt_quota:
1279 case Opt_usrquota:
1280 case Opt_grpquota:
1281 printk(KERN_ERR
1282 "EXT4-fs: quota options not supported.\n");
1283 break;
1284 case Opt_usrjquota:
1285 case Opt_grpjquota:
1286 case Opt_offusrjquota:
1287 case Opt_offgrpjquota:
1288 case Opt_jqfmt_vfsold:
1289 case Opt_jqfmt_vfsv0:
1290 printk(KERN_ERR
1291 "EXT4-fs: journaled quota options not "
1292 "supported.\n");
1293 break;
1294 case Opt_noquota:
1295 break;
1296 #endif
1297 case Opt_abort:
1298 set_opt(sbi->s_mount_opt, ABORT);
1299 break;
1300 case Opt_barrier:
1301 if (match_int(&args[0], &option))
1302 return 0;
1303 if (option)
1304 set_opt(sbi->s_mount_opt, BARRIER);
1305 else
1306 clear_opt(sbi->s_mount_opt, BARRIER);
1307 break;
1308 case Opt_ignore:
1309 break;
1310 case Opt_resize:
1311 if (!is_remount) {
1312 printk("EXT4-fs: resize option only available "
1313 "for remount\n");
1314 return 0;
1315 }
1316 if (match_int(&args[0], &option) != 0)
1317 return 0;
1318 *n_blocks_count = option;
1319 break;
1320 case Opt_nobh:
1321 set_opt(sbi->s_mount_opt, NOBH);
1322 break;
1323 case Opt_bh:
1324 clear_opt(sbi->s_mount_opt, NOBH);
1325 break;
1326 case Opt_extents:
1327 if (!EXT4_HAS_INCOMPAT_FEATURE(sb,
1328 EXT4_FEATURE_INCOMPAT_EXTENTS)) {
1329 ext4_warning(sb, __func__,
1330 "extents feature not enabled "
1331 "on this filesystem, use tune2fs\n");
1332 return 0;
1333 }
1334 set_opt (sbi->s_mount_opt, EXTENTS);
1335 break;
1336 case Opt_noextents:
1337 /*
1338 * When e2fsprogs support resizing an already existing
1339 * ext3 file system to greater than 2**32 we need to
1340 * add support to block allocator to handle growing
1341 * already existing block mapped inode so that blocks
1342 * allocated for them fall within 2**32
1343 */
1344 last_block = ext4_blocks_count(sbi->s_es) - 1;
1345 if (last_block > 0xffffffffULL) {
1346 printk(KERN_ERR "EXT4-fs: Filesystem too "
1347 "large to mount with "
1348 "-o noextents options\n");
1349 return 0;
1350 }
1351 clear_opt (sbi->s_mount_opt, EXTENTS);
1352 break;
1353 case Opt_i_version:
1354 set_opt(sbi->s_mount_opt, I_VERSION);
1355 sb->s_flags |= MS_I_VERSION;
1356 break;
1357 case Opt_nodelalloc:
1358 clear_opt(sbi->s_mount_opt, DELALLOC);
1359 break;
1360 case Opt_mballoc:
1361 set_opt(sbi->s_mount_opt, MBALLOC);
1362 break;
1363 case Opt_nomballoc:
1364 clear_opt(sbi->s_mount_opt, MBALLOC);
1365 break;
1366 case Opt_stripe:
1367 if (match_int(&args[0], &option))
1368 return 0;
1369 if (option < 0)
1370 return 0;
1371 sbi->s_stripe = option;
1372 break;
1373 case Opt_delalloc:
1374 set_opt(sbi->s_mount_opt, DELALLOC);
1375 break;
1376 default:
1377 printk (KERN_ERR
1378 "EXT4-fs: Unrecognized mount option \"%s\" "
1379 "or missing value\n", p);
1380 return 0;
1381 }
1382 }
1383 #ifdef CONFIG_QUOTA
1384 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1385 if ((sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA) &&
1386 sbi->s_qf_names[USRQUOTA])
1387 clear_opt(sbi->s_mount_opt, USRQUOTA);
1388
1389 if ((sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA) &&
1390 sbi->s_qf_names[GRPQUOTA])
1391 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1392
1393 if ((sbi->s_qf_names[USRQUOTA] &&
1394 (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)) ||
1395 (sbi->s_qf_names[GRPQUOTA] &&
1396 (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA))) {
1397 printk(KERN_ERR "EXT4-fs: old and new quota "
1398 "format mixing.\n");
1399 return 0;
1400 }
1401
1402 if (!sbi->s_jquota_fmt) {
1403 printk(KERN_ERR "EXT4-fs: journaled quota format "
1404 "not specified.\n");
1405 return 0;
1406 }
1407 } else {
1408 if (sbi->s_jquota_fmt) {
1409 printk(KERN_ERR "EXT4-fs: journaled quota format "
1410 "specified with no journaling "
1411 "enabled.\n");
1412 return 0;
1413 }
1414 }
1415 #endif
1416 return 1;
1417 }
1418
1419 static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
1420 int read_only)
1421 {
1422 struct ext4_sb_info *sbi = EXT4_SB(sb);
1423 int res = 0;
1424
1425 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
1426 printk (KERN_ERR "EXT4-fs warning: revision level too high, "
1427 "forcing read-only mode\n");
1428 res = MS_RDONLY;
1429 }
1430 if (read_only)
1431 return res;
1432 if (!(sbi->s_mount_state & EXT4_VALID_FS))
1433 printk (KERN_WARNING "EXT4-fs warning: mounting unchecked fs, "
1434 "running e2fsck is recommended\n");
1435 else if ((sbi->s_mount_state & EXT4_ERROR_FS))
1436 printk (KERN_WARNING
1437 "EXT4-fs warning: mounting fs with errors, "
1438 "running e2fsck is recommended\n");
1439 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
1440 le16_to_cpu(es->s_mnt_count) >=
1441 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
1442 printk (KERN_WARNING
1443 "EXT4-fs warning: maximal mount count reached, "
1444 "running e2fsck is recommended\n");
1445 else if (le32_to_cpu(es->s_checkinterval) &&
1446 (le32_to_cpu(es->s_lastcheck) +
1447 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1448 printk (KERN_WARNING
1449 "EXT4-fs warning: checktime reached, "
1450 "running e2fsck is recommended\n");
1451 #if 0
1452 /* @@@ We _will_ want to clear the valid bit if we find
1453 * inconsistencies, to force a fsck at reboot. But for
1454 * a plain journaled filesystem we can keep it set as
1455 * valid forever! :)
1456 */
1457 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
1458 #endif
1459 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
1460 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
1461 le16_add_cpu(&es->s_mnt_count, 1);
1462 es->s_mtime = cpu_to_le32(get_seconds());
1463 ext4_update_dynamic_rev(sb);
1464 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
1465
1466 ext4_commit_super(sb, es, 1);
1467 if (test_opt(sb, DEBUG))
1468 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%lu, "
1469 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
1470 sb->s_blocksize,
1471 sbi->s_groups_count,
1472 EXT4_BLOCKS_PER_GROUP(sb),
1473 EXT4_INODES_PER_GROUP(sb),
1474 sbi->s_mount_opt);
1475
1476 printk(KERN_INFO "EXT4 FS on %s, ", sb->s_id);
1477 if (EXT4_SB(sb)->s_journal->j_inode == NULL) {
1478 char b[BDEVNAME_SIZE];
1479
1480 printk("external journal on %s\n",
1481 bdevname(EXT4_SB(sb)->s_journal->j_dev, b));
1482 } else {
1483 printk("internal journal\n");
1484 }
1485 return res;
1486 }
1487
1488 static int ext4_fill_flex_info(struct super_block *sb)
1489 {
1490 struct ext4_sb_info *sbi = EXT4_SB(sb);
1491 struct ext4_group_desc *gdp = NULL;
1492 struct buffer_head *bh;
1493 ext4_group_t flex_group_count;
1494 ext4_group_t flex_group;
1495 int groups_per_flex = 0;
1496 __u64 block_bitmap = 0;
1497 int i;
1498
1499 if (!sbi->s_es->s_log_groups_per_flex) {
1500 sbi->s_log_groups_per_flex = 0;
1501 return 1;
1502 }
1503
1504 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
1505 groups_per_flex = 1 << sbi->s_log_groups_per_flex;
1506
1507 flex_group_count = (sbi->s_groups_count + groups_per_flex - 1) /
1508 groups_per_flex;
1509 sbi->s_flex_groups = kmalloc(flex_group_count *
1510 sizeof(struct flex_groups), GFP_KERNEL);
1511 if (sbi->s_flex_groups == NULL) {
1512 printk(KERN_ERR "EXT4-fs: not enough memory\n");
1513 goto failed;
1514 }
1515 memset(sbi->s_flex_groups, 0, flex_group_count *
1516 sizeof(struct flex_groups));
1517
1518 gdp = ext4_get_group_desc(sb, 1, &bh);
1519 block_bitmap = ext4_block_bitmap(sb, gdp) - 1;
1520
1521 for (i = 0; i < sbi->s_groups_count; i++) {
1522 gdp = ext4_get_group_desc(sb, i, &bh);
1523
1524 flex_group = ext4_flex_group(sbi, i);
1525 sbi->s_flex_groups[flex_group].free_inodes +=
1526 le16_to_cpu(gdp->bg_free_inodes_count);
1527 sbi->s_flex_groups[flex_group].free_blocks +=
1528 le16_to_cpu(gdp->bg_free_blocks_count);
1529 }
1530
1531 return 1;
1532 failed:
1533 return 0;
1534 }
1535
1536 __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
1537 struct ext4_group_desc *gdp)
1538 {
1539 __u16 crc = 0;
1540
1541 if (sbi->s_es->s_feature_ro_compat &
1542 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) {
1543 int offset = offsetof(struct ext4_group_desc, bg_checksum);
1544 __le32 le_group = cpu_to_le32(block_group);
1545
1546 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
1547 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
1548 crc = crc16(crc, (__u8 *)gdp, offset);
1549 offset += sizeof(gdp->bg_checksum); /* skip checksum */
1550 /* for checksum of struct ext4_group_desc do the rest...*/
1551 if ((sbi->s_es->s_feature_incompat &
1552 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) &&
1553 offset < le16_to_cpu(sbi->s_es->s_desc_size))
1554 crc = crc16(crc, (__u8 *)gdp + offset,
1555 le16_to_cpu(sbi->s_es->s_desc_size) -
1556 offset);
1557 }
1558
1559 return cpu_to_le16(crc);
1560 }
1561
1562 int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 block_group,
1563 struct ext4_group_desc *gdp)
1564 {
1565 if ((sbi->s_es->s_feature_ro_compat &
1566 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) &&
1567 (gdp->bg_checksum != ext4_group_desc_csum(sbi, block_group, gdp)))
1568 return 0;
1569
1570 return 1;
1571 }
1572
1573 /* Called at mount-time, super-block is locked */
1574 static int ext4_check_descriptors(struct super_block *sb)
1575 {
1576 struct ext4_sb_info *sbi = EXT4_SB(sb);
1577 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
1578 ext4_fsblk_t last_block;
1579 ext4_fsblk_t block_bitmap;
1580 ext4_fsblk_t inode_bitmap;
1581 ext4_fsblk_t inode_table;
1582 int flexbg_flag = 0;
1583 ext4_group_t i;
1584
1585 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
1586 flexbg_flag = 1;
1587
1588 ext4_debug ("Checking group descriptors");
1589
1590 for (i = 0; i < sbi->s_groups_count; i++) {
1591 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
1592
1593 if (i == sbi->s_groups_count - 1 || flexbg_flag)
1594 last_block = ext4_blocks_count(sbi->s_es) - 1;
1595 else
1596 last_block = first_block +
1597 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
1598
1599 block_bitmap = ext4_block_bitmap(sb, gdp);
1600 if (block_bitmap < first_block || block_bitmap > last_block)
1601 {
1602 printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: "
1603 "Block bitmap for group %lu not in group "
1604 "(block %llu)!", i, block_bitmap);
1605 return 0;
1606 }
1607 inode_bitmap = ext4_inode_bitmap(sb, gdp);
1608 if (inode_bitmap < first_block || inode_bitmap > last_block)
1609 {
1610 printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: "
1611 "Inode bitmap for group %lu not in group "
1612 "(block %llu)!", i, inode_bitmap);
1613 return 0;
1614 }
1615 inode_table = ext4_inode_table(sb, gdp);
1616 if (inode_table < first_block ||
1617 inode_table + sbi->s_itb_per_group - 1 > last_block)
1618 {
1619 printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: "
1620 "Inode table for group %lu not in group "
1621 "(block %llu)!", i, inode_table);
1622 return 0;
1623 }
1624 if (!ext4_group_desc_csum_verify(sbi, i, gdp)) {
1625 printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: "
1626 "Checksum for group %lu failed (%u!=%u)\n",
1627 i, le16_to_cpu(ext4_group_desc_csum(sbi, i,
1628 gdp)), le16_to_cpu(gdp->bg_checksum));
1629 return 0;
1630 }
1631 if (!flexbg_flag)
1632 first_block += EXT4_BLOCKS_PER_GROUP(sb);
1633 }
1634
1635 ext4_free_blocks_count_set(sbi->s_es, ext4_count_free_blocks(sb));
1636 sbi->s_es->s_free_inodes_count=cpu_to_le32(ext4_count_free_inodes(sb));
1637 return 1;
1638 }
1639
1640 /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
1641 * the superblock) which were deleted from all directories, but held open by
1642 * a process at the time of a crash. We walk the list and try to delete these
1643 * inodes at recovery time (only with a read-write filesystem).
1644 *
1645 * In order to keep the orphan inode chain consistent during traversal (in
1646 * case of crash during recovery), we link each inode into the superblock
1647 * orphan list_head and handle it the same way as an inode deletion during
1648 * normal operation (which journals the operations for us).
1649 *
1650 * We only do an iget() and an iput() on each inode, which is very safe if we
1651 * accidentally point at an in-use or already deleted inode. The worst that
1652 * can happen in this case is that we get a "bit already cleared" message from
1653 * ext4_free_inode(). The only reason we would point at a wrong inode is if
1654 * e2fsck was run on this filesystem, and it must have already done the orphan
1655 * inode cleanup for us, so we can safely abort without any further action.
1656 */
1657 static void ext4_orphan_cleanup (struct super_block * sb,
1658 struct ext4_super_block * es)
1659 {
1660 unsigned int s_flags = sb->s_flags;
1661 int nr_orphans = 0, nr_truncates = 0;
1662 #ifdef CONFIG_QUOTA
1663 int i;
1664 #endif
1665 if (!es->s_last_orphan) {
1666 jbd_debug(4, "no orphan inodes to clean up\n");
1667 return;
1668 }
1669
1670 if (bdev_read_only(sb->s_bdev)) {
1671 printk(KERN_ERR "EXT4-fs: write access "
1672 "unavailable, skipping orphan cleanup.\n");
1673 return;
1674 }
1675
1676 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
1677 if (es->s_last_orphan)
1678 jbd_debug(1, "Errors on filesystem, "
1679 "clearing orphan list.\n");
1680 es->s_last_orphan = 0;
1681 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1682 return;
1683 }
1684
1685 if (s_flags & MS_RDONLY) {
1686 printk(KERN_INFO "EXT4-fs: %s: orphan cleanup on readonly fs\n",
1687 sb->s_id);
1688 sb->s_flags &= ~MS_RDONLY;
1689 }
1690 #ifdef CONFIG_QUOTA
1691 /* Needed for iput() to work correctly and not trash data */
1692 sb->s_flags |= MS_ACTIVE;
1693 /* Turn on quotas so that they are updated correctly */
1694 for (i = 0; i < MAXQUOTAS; i++) {
1695 if (EXT4_SB(sb)->s_qf_names[i]) {
1696 int ret = ext4_quota_on_mount(sb, i);
1697 if (ret < 0)
1698 printk(KERN_ERR
1699 "EXT4-fs: Cannot turn on journaled "
1700 "quota: error %d\n", ret);
1701 }
1702 }
1703 #endif
1704
1705 while (es->s_last_orphan) {
1706 struct inode *inode;
1707
1708 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
1709 if (IS_ERR(inode)) {
1710 es->s_last_orphan = 0;
1711 break;
1712 }
1713
1714 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
1715 DQUOT_INIT(inode);
1716 if (inode->i_nlink) {
1717 printk(KERN_DEBUG
1718 "%s: truncating inode %lu to %Ld bytes\n",
1719 __func__, inode->i_ino, inode->i_size);
1720 jbd_debug(2, "truncating inode %lu to %Ld bytes\n",
1721 inode->i_ino, inode->i_size);
1722 ext4_truncate(inode);
1723 nr_truncates++;
1724 } else {
1725 printk(KERN_DEBUG
1726 "%s: deleting unreferenced inode %lu\n",
1727 __func__, inode->i_ino);
1728 jbd_debug(2, "deleting unreferenced inode %lu\n",
1729 inode->i_ino);
1730 nr_orphans++;
1731 }
1732 iput(inode); /* The delete magic happens here! */
1733 }
1734
1735 #define PLURAL(x) (x), ((x)==1) ? "" : "s"
1736
1737 if (nr_orphans)
1738 printk(KERN_INFO "EXT4-fs: %s: %d orphan inode%s deleted\n",
1739 sb->s_id, PLURAL(nr_orphans));
1740 if (nr_truncates)
1741 printk(KERN_INFO "EXT4-fs: %s: %d truncate%s cleaned up\n",
1742 sb->s_id, PLURAL(nr_truncates));
1743 #ifdef CONFIG_QUOTA
1744 /* Turn quotas off */
1745 for (i = 0; i < MAXQUOTAS; i++) {
1746 if (sb_dqopt(sb)->files[i])
1747 vfs_quota_off(sb, i, 0);
1748 }
1749 #endif
1750 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1751 }
1752 /*
1753 * Maximal extent format file size.
1754 * Resulting logical blkno at s_maxbytes must fit in our on-disk
1755 * extent format containers, within a sector_t, and within i_blocks
1756 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
1757 * so that won't be a limiting factor.
1758 *
1759 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
1760 */
1761 static loff_t ext4_max_size(int blkbits)
1762 {
1763 loff_t res;
1764 loff_t upper_limit = MAX_LFS_FILESIZE;
1765
1766 /* small i_blocks in vfs inode? */
1767 if (sizeof(blkcnt_t) < sizeof(u64)) {
1768 /*
1769 * CONFIG_LSF is not enabled implies the inode
1770 * i_block represent total blocks in 512 bytes
1771 * 32 == size of vfs inode i_blocks * 8
1772 */
1773 upper_limit = (1LL << 32) - 1;
1774
1775 /* total blocks in file system block size */
1776 upper_limit >>= (blkbits - 9);
1777 upper_limit <<= blkbits;
1778 }
1779
1780 /* 32-bit extent-start container, ee_block */
1781 res = 1LL << 32;
1782 res <<= blkbits;
1783 res -= 1;
1784
1785 /* Sanity check against vm- & vfs- imposed limits */
1786 if (res > upper_limit)
1787 res = upper_limit;
1788
1789 return res;
1790 }
1791
1792 /*
1793 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
1794 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
1795 * We need to be 1 filesystem block less than the 2^48 sector limit.
1796 */
1797 static loff_t ext4_max_bitmap_size(int bits)
1798 {
1799 loff_t res = EXT4_NDIR_BLOCKS;
1800 int meta_blocks;
1801 loff_t upper_limit;
1802 /* This is calculated to be the largest file size for a
1803 * dense, bitmapped file such that the total number of
1804 * sectors in the file, including data and all indirect blocks,
1805 * does not exceed 2^48 -1
1806 * __u32 i_blocks_lo and _u16 i_blocks_high representing the
1807 * total number of 512 bytes blocks of the file
1808 */
1809
1810 if (sizeof(blkcnt_t) < sizeof(u64)) {
1811 /*
1812 * CONFIG_LSF is not enabled implies the inode
1813 * i_block represent total blocks in 512 bytes
1814 * 32 == size of vfs inode i_blocks * 8
1815 */
1816 upper_limit = (1LL << 32) - 1;
1817
1818 /* total blocks in file system block size */
1819 upper_limit >>= (bits - 9);
1820
1821 } else {
1822 /*
1823 * We use 48 bit ext4_inode i_blocks
1824 * With EXT4_HUGE_FILE_FL set the i_blocks
1825 * represent total number of blocks in
1826 * file system block size
1827 */
1828 upper_limit = (1LL << 48) - 1;
1829
1830 }
1831
1832 /* indirect blocks */
1833 meta_blocks = 1;
1834 /* double indirect blocks */
1835 meta_blocks += 1 + (1LL << (bits-2));
1836 /* tripple indirect blocks */
1837 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
1838
1839 upper_limit -= meta_blocks;
1840 upper_limit <<= bits;
1841
1842 res += 1LL << (bits-2);
1843 res += 1LL << (2*(bits-2));
1844 res += 1LL << (3*(bits-2));
1845 res <<= bits;
1846 if (res > upper_limit)
1847 res = upper_limit;
1848
1849 if (res > MAX_LFS_FILESIZE)
1850 res = MAX_LFS_FILESIZE;
1851
1852 return res;
1853 }
1854
1855 static ext4_fsblk_t descriptor_loc(struct super_block *sb,
1856 ext4_fsblk_t logical_sb_block, int nr)
1857 {
1858 struct ext4_sb_info *sbi = EXT4_SB(sb);
1859 ext4_group_t bg, first_meta_bg;
1860 int has_super = 0;
1861
1862 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1863
1864 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
1865 nr < first_meta_bg)
1866 return logical_sb_block + nr + 1;
1867 bg = sbi->s_desc_per_block * nr;
1868 if (ext4_bg_has_super(sb, bg))
1869 has_super = 1;
1870 return (has_super + ext4_group_first_block_no(sb, bg));
1871 }
1872
1873 /**
1874 * ext4_get_stripe_size: Get the stripe size.
1875 * @sbi: In memory super block info
1876 *
1877 * If we have specified it via mount option, then
1878 * use the mount option value. If the value specified at mount time is
1879 * greater than the blocks per group use the super block value.
1880 * If the super block value is greater than blocks per group return 0.
1881 * Allocator needs it be less than blocks per group.
1882 *
1883 */
1884 static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
1885 {
1886 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
1887 unsigned long stripe_width =
1888 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
1889
1890 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
1891 return sbi->s_stripe;
1892
1893 if (stripe_width <= sbi->s_blocks_per_group)
1894 return stripe_width;
1895
1896 if (stride <= sbi->s_blocks_per_group)
1897 return stride;
1898
1899 return 0;
1900 }
1901
1902 static int ext4_fill_super (struct super_block *sb, void *data, int silent)
1903 __releases(kernel_lock)
1904 __acquires(kernel_lock)
1905
1906 {
1907 struct buffer_head * bh;
1908 struct ext4_super_block *es = NULL;
1909 struct ext4_sb_info *sbi;
1910 ext4_fsblk_t block;
1911 ext4_fsblk_t sb_block = get_sb_block(&data);
1912 ext4_fsblk_t logical_sb_block;
1913 unsigned long offset = 0;
1914 unsigned int journal_inum = 0;
1915 unsigned long journal_devnum = 0;
1916 unsigned long def_mount_opts;
1917 struct inode *root;
1918 int ret = -EINVAL;
1919 int blocksize;
1920 int db_count;
1921 int i;
1922 int needs_recovery;
1923 __le32 features;
1924 __u64 blocks_count;
1925 int err;
1926
1927 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
1928 if (!sbi)
1929 return -ENOMEM;
1930 sb->s_fs_info = sbi;
1931 sbi->s_mount_opt = 0;
1932 sbi->s_resuid = EXT4_DEF_RESUID;
1933 sbi->s_resgid = EXT4_DEF_RESGID;
1934 sbi->s_sb_block = sb_block;
1935
1936 unlock_kernel();
1937
1938 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
1939 if (!blocksize) {
1940 printk(KERN_ERR "EXT4-fs: unable to set blocksize\n");
1941 goto out_fail;
1942 }
1943
1944 /*
1945 * The ext4 superblock will not be buffer aligned for other than 1kB
1946 * block sizes. We need to calculate the offset from buffer start.
1947 */
1948 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
1949 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
1950 offset = do_div(logical_sb_block, blocksize);
1951 } else {
1952 logical_sb_block = sb_block;
1953 }
1954
1955 if (!(bh = sb_bread(sb, logical_sb_block))) {
1956 printk (KERN_ERR "EXT4-fs: unable to read superblock\n");
1957 goto out_fail;
1958 }
1959 /*
1960 * Note: s_es must be initialized as soon as possible because
1961 * some ext4 macro-instructions depend on its value
1962 */
1963 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
1964 sbi->s_es = es;
1965 sb->s_magic = le16_to_cpu(es->s_magic);
1966 if (sb->s_magic != EXT4_SUPER_MAGIC)
1967 goto cantfind_ext4;
1968
1969 /* Set defaults before we parse the mount options */
1970 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
1971 if (def_mount_opts & EXT4_DEFM_DEBUG)
1972 set_opt(sbi->s_mount_opt, DEBUG);
1973 if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
1974 set_opt(sbi->s_mount_opt, GRPID);
1975 if (def_mount_opts & EXT4_DEFM_UID16)
1976 set_opt(sbi->s_mount_opt, NO_UID32);
1977 #ifdef CONFIG_EXT4DEV_FS_XATTR
1978 if (def_mount_opts & EXT4_DEFM_XATTR_USER)
1979 set_opt(sbi->s_mount_opt, XATTR_USER);
1980 #endif
1981 #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
1982 if (def_mount_opts & EXT4_DEFM_ACL)
1983 set_opt(sbi->s_mount_opt, POSIX_ACL);
1984 #endif
1985 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
1986 sbi->s_mount_opt |= EXT4_MOUNT_JOURNAL_DATA;
1987 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
1988 sbi->s_mount_opt |= EXT4_MOUNT_ORDERED_DATA;
1989 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
1990 sbi->s_mount_opt |= EXT4_MOUNT_WRITEBACK_DATA;
1991
1992 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
1993 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1994 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
1995 set_opt(sbi->s_mount_opt, ERRORS_CONT);
1996 else
1997 set_opt(sbi->s_mount_opt, ERRORS_RO);
1998
1999 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
2000 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
2001
2002 set_opt(sbi->s_mount_opt, RESERVATION);
2003 set_opt(sbi->s_mount_opt, BARRIER);
2004
2005 /*
2006 * turn on extents feature by default in ext4 filesystem
2007 * only if feature flag already set by mkfs or tune2fs.
2008 * Use -o noextents to turn it off
2009 */
2010 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS))
2011 set_opt(sbi->s_mount_opt, EXTENTS);
2012 else
2013 ext4_warning(sb, __func__,
2014 "extents feature not enabled on this filesystem, "
2015 "use tune2fs.\n");
2016 /*
2017 * turn on mballoc code by default in ext4 filesystem
2018 * Use -o nomballoc to turn it off
2019 */
2020 set_opt(sbi->s_mount_opt, MBALLOC);
2021
2022 /*
2023 * enable delayed allocation by default
2024 * Use -o nodelalloc to turn it off
2025 */
2026 set_opt(sbi->s_mount_opt, DELALLOC);
2027
2028
2029 if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
2030 NULL, 0))
2031 goto failed_mount;
2032
2033 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
2034 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
2035
2036 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
2037 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
2038 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
2039 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
2040 printk(KERN_WARNING
2041 "EXT4-fs warning: feature flags set on rev 0 fs, "
2042 "running e2fsck is recommended\n");
2043
2044 /*
2045 * Since ext4 is still considered development code, we require
2046 * that the TEST_FILESYS flag in s->flags be set.
2047 */
2048 if (!(le32_to_cpu(es->s_flags) & EXT2_FLAGS_TEST_FILESYS)) {
2049 printk(KERN_WARNING "EXT4-fs: %s: not marked "
2050 "OK to use with test code.\n", sb->s_id);
2051 goto failed_mount;
2052 }
2053
2054 /*
2055 * Check feature flags regardless of the revision level, since we
2056 * previously didn't change the revision level when setting the flags,
2057 * so there is a chance incompat flags are set on a rev 0 filesystem.
2058 */
2059 features = EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP);
2060 if (features) {
2061 printk(KERN_ERR "EXT4-fs: %s: couldn't mount because of "
2062 "unsupported optional features (%x).\n",
2063 sb->s_id, le32_to_cpu(features));
2064 goto failed_mount;
2065 }
2066 features = EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP);
2067 if (!(sb->s_flags & MS_RDONLY) && features) {
2068 printk(KERN_ERR "EXT4-fs: %s: couldn't mount RDWR because of "
2069 "unsupported optional features (%x).\n",
2070 sb->s_id, le32_to_cpu(features));
2071 goto failed_mount;
2072 }
2073 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) {
2074 /*
2075 * Large file size enabled file system can only be
2076 * mount if kernel is build with CONFIG_LSF
2077 */
2078 if (sizeof(root->i_blocks) < sizeof(u64) &&
2079 !(sb->s_flags & MS_RDONLY)) {
2080 printk(KERN_ERR "EXT4-fs: %s: Filesystem with huge "
2081 "files cannot be mounted read-write "
2082 "without CONFIG_LSF.\n", sb->s_id);
2083 goto failed_mount;
2084 }
2085 }
2086 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
2087
2088 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
2089 blocksize > EXT4_MAX_BLOCK_SIZE) {
2090 printk(KERN_ERR
2091 "EXT4-fs: Unsupported filesystem blocksize %d on %s.\n",
2092 blocksize, sb->s_id);
2093 goto failed_mount;
2094 }
2095
2096 if (sb->s_blocksize != blocksize) {
2097
2098 /* Validate the filesystem blocksize */
2099 if (!sb_set_blocksize(sb, blocksize)) {
2100 printk(KERN_ERR "EXT4-fs: bad block size %d.\n",
2101 blocksize);
2102 goto failed_mount;
2103 }
2104
2105 brelse (bh);
2106 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
2107 offset = do_div(logical_sb_block, blocksize);
2108 bh = sb_bread(sb, logical_sb_block);
2109 if (!bh) {
2110 printk(KERN_ERR
2111 "EXT4-fs: Can't read superblock on 2nd try.\n");
2112 goto failed_mount;
2113 }
2114 es = (struct ext4_super_block *)(((char *)bh->b_data) + offset);
2115 sbi->s_es = es;
2116 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
2117 printk (KERN_ERR
2118 "EXT4-fs: Magic mismatch, very weird !\n");
2119 goto failed_mount;
2120 }
2121 }
2122
2123 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits);
2124 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits);
2125
2126 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
2127 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
2128 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
2129 } else {
2130 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
2131 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
2132 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
2133 (!is_power_of_2(sbi->s_inode_size)) ||
2134 (sbi->s_inode_size > blocksize)) {
2135 printk (KERN_ERR
2136 "EXT4-fs: unsupported inode size: %d\n",
2137 sbi->s_inode_size);
2138 goto failed_mount;
2139 }
2140 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
2141 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
2142 }
2143 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
2144 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
2145 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
2146 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
2147 !is_power_of_2(sbi->s_desc_size)) {
2148 printk(KERN_ERR
2149 "EXT4-fs: unsupported descriptor size %lu\n",
2150 sbi->s_desc_size);
2151 goto failed_mount;
2152 }
2153 } else
2154 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
2155 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
2156 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
2157 if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
2158 goto cantfind_ext4;
2159 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
2160 if (sbi->s_inodes_per_block == 0)
2161 goto cantfind_ext4;
2162 sbi->s_itb_per_group = sbi->s_inodes_per_group /
2163 sbi->s_inodes_per_block;
2164 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
2165 sbi->s_sbh = bh;
2166 sbi->s_mount_state = le16_to_cpu(es->s_state);
2167 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
2168 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
2169 for (i=0; i < 4; i++)
2170 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
2171 sbi->s_def_hash_version = es->s_def_hash_version;
2172
2173 if (sbi->s_blocks_per_group > blocksize * 8) {
2174 printk (KERN_ERR
2175 "EXT4-fs: #blocks per group too big: %lu\n",
2176 sbi->s_blocks_per_group);
2177 goto failed_mount;
2178 }
2179 if (sbi->s_inodes_per_group > blocksize * 8) {
2180 printk (KERN_ERR
2181 "EXT4-fs: #inodes per group too big: %lu\n",
2182 sbi->s_inodes_per_group);
2183 goto failed_mount;
2184 }
2185
2186 if (ext4_blocks_count(es) >
2187 (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) {
2188 printk(KERN_ERR "EXT4-fs: filesystem on %s:"
2189 " too large to mount safely\n", sb->s_id);
2190 if (sizeof(sector_t) < 8)
2191 printk(KERN_WARNING "EXT4-fs: CONFIG_LBD not "
2192 "enabled\n");
2193 goto failed_mount;
2194 }
2195
2196 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
2197 goto cantfind_ext4;
2198
2199 /* ensure blocks_count calculation below doesn't sign-extend */
2200 if (ext4_blocks_count(es) + EXT4_BLOCKS_PER_GROUP(sb) <
2201 le32_to_cpu(es->s_first_data_block) + 1) {
2202 printk(KERN_WARNING "EXT4-fs: bad geometry: block count %llu, "
2203 "first data block %u, blocks per group %lu\n",
2204 ext4_blocks_count(es),
2205 le32_to_cpu(es->s_first_data_block),
2206 EXT4_BLOCKS_PER_GROUP(sb));
2207 goto failed_mount;
2208 }
2209 blocks_count = (ext4_blocks_count(es) -
2210 le32_to_cpu(es->s_first_data_block) +
2211 EXT4_BLOCKS_PER_GROUP(sb) - 1);
2212 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
2213 sbi->s_groups_count = blocks_count;
2214 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
2215 EXT4_DESC_PER_BLOCK(sb);
2216 sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
2217 GFP_KERNEL);
2218 if (sbi->s_group_desc == NULL) {
2219 printk (KERN_ERR "EXT4-fs: not enough memory\n");
2220 goto failed_mount;
2221 }
2222
2223 bgl_lock_init(&sbi->s_blockgroup_lock);
2224
2225 for (i = 0; i < db_count; i++) {
2226 block = descriptor_loc(sb, logical_sb_block, i);
2227 sbi->s_group_desc[i] = sb_bread(sb, block);
2228 if (!sbi->s_group_desc[i]) {
2229 printk (KERN_ERR "EXT4-fs: "
2230 "can't read group descriptor %d\n", i);
2231 db_count = i;
2232 goto failed_mount2;
2233 }
2234 }
2235 if (!ext4_check_descriptors (sb)) {
2236 printk(KERN_ERR "EXT4-fs: group descriptors corrupted!\n");
2237 goto failed_mount2;
2238 }
2239 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
2240 if (!ext4_fill_flex_info(sb)) {
2241 printk(KERN_ERR
2242 "EXT4-fs: unable to initialize "
2243 "flex_bg meta info!\n");
2244 goto failed_mount2;
2245 }
2246
2247 sbi->s_gdb_count = db_count;
2248 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
2249 spin_lock_init(&sbi->s_next_gen_lock);
2250
2251 err = percpu_counter_init(&sbi->s_freeblocks_counter,
2252 ext4_count_free_blocks(sb));
2253 if (!err) {
2254 err = percpu_counter_init(&sbi->s_freeinodes_counter,
2255 ext4_count_free_inodes(sb));
2256 }
2257 if (!err) {
2258 err = percpu_counter_init(&sbi->s_dirs_counter,
2259 ext4_count_dirs(sb));
2260 }
2261 if (err) {
2262 printk(KERN_ERR "EXT4-fs: insufficient memory\n");
2263 goto failed_mount3;
2264 }
2265
2266 /* per fileystem reservation list head & lock */
2267 spin_lock_init(&sbi->s_rsv_window_lock);
2268 sbi->s_rsv_window_root = RB_ROOT;
2269 /* Add a single, static dummy reservation to the start of the
2270 * reservation window list --- it gives us a placeholder for
2271 * append-at-start-of-list which makes the allocation logic
2272 * _much_ simpler. */
2273 sbi->s_rsv_window_head.rsv_start = EXT4_RESERVE_WINDOW_NOT_ALLOCATED;
2274 sbi->s_rsv_window_head.rsv_end = EXT4_RESERVE_WINDOW_NOT_ALLOCATED;
2275 sbi->s_rsv_window_head.rsv_alloc_hit = 0;
2276 sbi->s_rsv_window_head.rsv_goal_size = 0;
2277 ext4_rsv_window_add(sb, &sbi->s_rsv_window_head);
2278
2279 sbi->s_stripe = ext4_get_stripe_size(sbi);
2280
2281 /*
2282 * set up enough so that it can read an inode
2283 */
2284 sb->s_op = &ext4_sops;
2285 sb->s_export_op = &ext4_export_ops;
2286 sb->s_xattr = ext4_xattr_handlers;
2287 #ifdef CONFIG_QUOTA
2288 sb->s_qcop = &ext4_qctl_operations;
2289 sb->dq_op = &ext4_quota_operations;
2290 #endif
2291 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
2292
2293 sb->s_root = NULL;
2294
2295 needs_recovery = (es->s_last_orphan != 0 ||
2296 EXT4_HAS_INCOMPAT_FEATURE(sb,
2297 EXT4_FEATURE_INCOMPAT_RECOVER));
2298
2299 /*
2300 * The first inode we look at is the journal inode. Don't try
2301 * root first: it may be modified in the journal!
2302 */
2303 if (!test_opt(sb, NOLOAD) &&
2304 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
2305 if (ext4_load_journal(sb, es, journal_devnum))
2306 goto failed_mount3;
2307 if (!(sb->s_flags & MS_RDONLY) &&
2308 EXT4_SB(sb)->s_journal->j_failed_commit) {
2309 printk(KERN_CRIT "EXT4-fs error (device %s): "
2310 "ext4_fill_super: Journal transaction "
2311 "%u is corrupt\n", sb->s_id,
2312 EXT4_SB(sb)->s_journal->j_failed_commit);
2313 if (test_opt (sb, ERRORS_RO)) {
2314 printk (KERN_CRIT
2315 "Mounting filesystem read-only\n");
2316 sb->s_flags |= MS_RDONLY;
2317 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
2318 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
2319 }
2320 if (test_opt(sb, ERRORS_PANIC)) {
2321 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
2322 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
2323 ext4_commit_super(sb, es, 1);
2324 printk(KERN_CRIT
2325 "EXT4-fs (device %s): mount failed\n",
2326 sb->s_id);
2327 goto failed_mount4;
2328 }
2329 }
2330 } else if (journal_inum) {
2331 if (ext4_create_journal(sb, es, journal_inum))
2332 goto failed_mount3;
2333 } else {
2334 if (!silent)
2335 printk (KERN_ERR
2336 "ext4: No journal on filesystem on %s\n",
2337 sb->s_id);
2338 goto failed_mount3;
2339 }
2340
2341 if (ext4_blocks_count(es) > 0xffffffffULL &&
2342 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
2343 JBD2_FEATURE_INCOMPAT_64BIT)) {
2344 printk(KERN_ERR "ext4: Failed to set 64-bit journal feature\n");
2345 goto failed_mount4;
2346 }
2347
2348 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
2349 jbd2_journal_set_features(sbi->s_journal,
2350 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
2351 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2352 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
2353 jbd2_journal_set_features(sbi->s_journal,
2354 JBD2_FEATURE_COMPAT_CHECKSUM, 0, 0);
2355 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
2356 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2357 } else {
2358 jbd2_journal_clear_features(sbi->s_journal,
2359 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
2360 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2361 }
2362
2363 /* We have now updated the journal if required, so we can
2364 * validate the data journaling mode. */
2365 switch (test_opt(sb, DATA_FLAGS)) {
2366 case 0:
2367 /* No mode set, assume a default based on the journal
2368 * capabilities: ORDERED_DATA if the journal can
2369 * cope, else JOURNAL_DATA
2370 */
2371 if (jbd2_journal_check_available_features
2372 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
2373 set_opt(sbi->s_mount_opt, ORDERED_DATA);
2374 else
2375 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
2376 break;
2377
2378 case EXT4_MOUNT_ORDERED_DATA:
2379 case EXT4_MOUNT_WRITEBACK_DATA:
2380 if (!jbd2_journal_check_available_features
2381 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
2382 printk(KERN_ERR "EXT4-fs: Journal does not support "
2383 "requested data journaling mode\n");
2384 goto failed_mount4;
2385 }
2386 default:
2387 break;
2388 }
2389
2390 if (test_opt(sb, NOBH)) {
2391 if (!(test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)) {
2392 printk(KERN_WARNING "EXT4-fs: Ignoring nobh option - "
2393 "its supported only with writeback mode\n");
2394 clear_opt(sbi->s_mount_opt, NOBH);
2395 }
2396 }
2397 /*
2398 * The jbd2_journal_load will have done any necessary log recovery,
2399 * so we can safely mount the rest of the filesystem now.
2400 */
2401
2402 root = ext4_iget(sb, EXT4_ROOT_INO);
2403 if (IS_ERR(root)) {
2404 printk(KERN_ERR "EXT4-fs: get root inode failed\n");
2405 ret = PTR_ERR(root);
2406 goto failed_mount4;
2407 }
2408 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
2409 iput(root);
2410 printk(KERN_ERR "EXT4-fs: corrupt root inode, run e2fsck\n");
2411 goto failed_mount4;
2412 }
2413 sb->s_root = d_alloc_root(root);
2414 if (!sb->s_root) {
2415 printk(KERN_ERR "EXT4-fs: get root dentry failed\n");
2416 iput(root);
2417 ret = -ENOMEM;
2418 goto failed_mount4;
2419 }
2420
2421 ext4_setup_super (sb, es, sb->s_flags & MS_RDONLY);
2422
2423 /* determine the minimum size of new large inodes, if present */
2424 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
2425 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
2426 EXT4_GOOD_OLD_INODE_SIZE;
2427 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
2428 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) {
2429 if (sbi->s_want_extra_isize <
2430 le16_to_cpu(es->s_want_extra_isize))
2431 sbi->s_want_extra_isize =
2432 le16_to_cpu(es->s_want_extra_isize);
2433 if (sbi->s_want_extra_isize <
2434 le16_to_cpu(es->s_min_extra_isize))
2435 sbi->s_want_extra_isize =
2436 le16_to_cpu(es->s_min_extra_isize);
2437 }
2438 }
2439 /* Check if enough inode space is available */
2440 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
2441 sbi->s_inode_size) {
2442 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
2443 EXT4_GOOD_OLD_INODE_SIZE;
2444 printk(KERN_INFO "EXT4-fs: required extra inode space not"
2445 "available.\n");
2446 }
2447
2448 /*
2449 * akpm: core read_super() calls in here with the superblock locked.
2450 * That deadlocks, because orphan cleanup needs to lock the superblock
2451 * in numerous places. Here we just pop the lock - it's relatively
2452 * harmless, because we are now ready to accept write_super() requests,
2453 * and aviro says that's the only reason for hanging onto the
2454 * superblock lock.
2455 */
2456 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
2457 ext4_orphan_cleanup(sb, es);
2458 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
2459 if (needs_recovery)
2460 printk (KERN_INFO "EXT4-fs: recovery complete.\n");
2461 ext4_mark_recovery_complete(sb, es);
2462 printk (KERN_INFO "EXT4-fs: mounted filesystem with %s data mode.\n",
2463 test_opt(sb,DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA ? "journal":
2464 test_opt(sb,DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA ? "ordered":
2465 "writeback");
2466
2467 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
2468 printk(KERN_WARNING "EXT4-fs: Ignoring delalloc option - "
2469 "requested data journaling mode\n");
2470 clear_opt(sbi->s_mount_opt, DELALLOC);
2471 } else if (test_opt(sb, DELALLOC))
2472 printk(KERN_INFO "EXT4-fs: delayed allocation enabled\n");
2473
2474 ext4_ext_init(sb);
2475 ext4_mb_init(sb, needs_recovery);
2476
2477 lock_kernel();
2478 return 0;
2479
2480 cantfind_ext4:
2481 if (!silent)
2482 printk(KERN_ERR "VFS: Can't find ext4 filesystem on dev %s.\n",
2483 sb->s_id);
2484 goto failed_mount;
2485
2486 failed_mount4:
2487 jbd2_journal_destroy(sbi->s_journal);
2488 sbi->s_journal = NULL;
2489 failed_mount3:
2490 percpu_counter_destroy(&sbi->s_freeblocks_counter);
2491 percpu_counter_destroy(&sbi->s_freeinodes_counter);
2492 percpu_counter_destroy(&sbi->s_dirs_counter);
2493 failed_mount2:
2494 for (i = 0; i < db_count; i++)
2495 brelse(sbi->s_group_desc[i]);
2496 kfree(sbi->s_group_desc);
2497 failed_mount:
2498 #ifdef CONFIG_QUOTA
2499 for (i = 0; i < MAXQUOTAS; i++)
2500 kfree(sbi->s_qf_names[i]);
2501 #endif
2502 ext4_blkdev_remove(sbi);
2503 brelse(bh);
2504 out_fail:
2505 sb->s_fs_info = NULL;
2506 kfree(sbi);
2507 lock_kernel();
2508 return ret;
2509 }
2510
2511 /*
2512 * Setup any per-fs journal parameters now. We'll do this both on
2513 * initial mount, once the journal has been initialised but before we've
2514 * done any recovery; and again on any subsequent remount.
2515 */
2516 static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
2517 {
2518 struct ext4_sb_info *sbi = EXT4_SB(sb);
2519
2520 if (sbi->s_commit_interval)
2521 journal->j_commit_interval = sbi->s_commit_interval;
2522 /* We could also set up an ext4-specific default for the commit
2523 * interval here, but for now we'll just fall back to the jbd
2524 * default. */
2525
2526 spin_lock(&journal->j_state_lock);
2527 if (test_opt(sb, BARRIER))
2528 journal->j_flags |= JBD2_BARRIER;
2529 else
2530 journal->j_flags &= ~JBD2_BARRIER;
2531 spin_unlock(&journal->j_state_lock);
2532 }
2533
2534 static journal_t *ext4_get_journal(struct super_block *sb,
2535 unsigned int journal_inum)
2536 {
2537 struct inode *journal_inode;
2538 journal_t *journal;
2539
2540 /* First, test for the existence of a valid inode on disk. Bad
2541 * things happen if we iget() an unused inode, as the subsequent
2542 * iput() will try to delete it. */
2543
2544 journal_inode = ext4_iget(sb, journal_inum);
2545 if (IS_ERR(journal_inode)) {
2546 printk(KERN_ERR "EXT4-fs: no journal found.\n");
2547 return NULL;
2548 }
2549 if (!journal_inode->i_nlink) {
2550 make_bad_inode(journal_inode);
2551 iput(journal_inode);
2552 printk(KERN_ERR "EXT4-fs: journal inode is deleted.\n");
2553 return NULL;
2554 }
2555
2556 jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
2557 journal_inode, journal_inode->i_size);
2558 if (!S_ISREG(journal_inode->i_mode)) {
2559 printk(KERN_ERR "EXT4-fs: invalid journal inode.\n");
2560 iput(journal_inode);
2561 return NULL;
2562 }
2563
2564 journal = jbd2_journal_init_inode(journal_inode);
2565 if (!journal) {
2566 printk(KERN_ERR "EXT4-fs: Could not load journal inode\n");
2567 iput(journal_inode);
2568 return NULL;
2569 }
2570 journal->j_private = sb;
2571 ext4_init_journal_params(sb, journal);
2572 return journal;
2573 }
2574
2575 static journal_t *ext4_get_dev_journal(struct super_block *sb,
2576 dev_t j_dev)
2577 {
2578 struct buffer_head * bh;
2579 journal_t *journal;
2580 ext4_fsblk_t start;
2581 ext4_fsblk_t len;
2582 int hblock, blocksize;
2583 ext4_fsblk_t sb_block;
2584 unsigned long offset;
2585 struct ext4_super_block * es;
2586 struct block_device *bdev;
2587
2588 bdev = ext4_blkdev_get(j_dev);
2589 if (bdev == NULL)
2590 return NULL;
2591
2592 if (bd_claim(bdev, sb)) {
2593 printk(KERN_ERR
2594 "EXT4: failed to claim external journal device.\n");
2595 blkdev_put(bdev);
2596 return NULL;
2597 }
2598
2599 blocksize = sb->s_blocksize;
2600 hblock = bdev_hardsect_size(bdev);
2601 if (blocksize < hblock) {
2602 printk(KERN_ERR
2603 "EXT4-fs: blocksize too small for journal device.\n");
2604 goto out_bdev;
2605 }
2606
2607 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
2608 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
2609 set_blocksize(bdev, blocksize);
2610 if (!(bh = __bread(bdev, sb_block, blocksize))) {
2611 printk(KERN_ERR "EXT4-fs: couldn't read superblock of "
2612 "external journal\n");
2613 goto out_bdev;
2614 }
2615
2616 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
2617 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
2618 !(le32_to_cpu(es->s_feature_incompat) &
2619 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
2620 printk(KERN_ERR "EXT4-fs: external journal has "
2621 "bad superblock\n");
2622 brelse(bh);
2623 goto out_bdev;
2624 }
2625
2626 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
2627 printk(KERN_ERR "EXT4-fs: journal UUID does not match\n");
2628 brelse(bh);
2629 goto out_bdev;
2630 }
2631
2632 len = ext4_blocks_count(es);
2633 start = sb_block + 1;
2634 brelse(bh); /* we're done with the superblock */
2635
2636 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
2637 start, len, blocksize);
2638 if (!journal) {
2639 printk(KERN_ERR "EXT4-fs: failed to create device journal\n");
2640 goto out_bdev;
2641 }
2642 journal->j_private = sb;
2643 ll_rw_block(READ, 1, &journal->j_sb_buffer);
2644 wait_on_buffer(journal->j_sb_buffer);
2645 if (!buffer_uptodate(journal->j_sb_buffer)) {
2646 printk(KERN_ERR "EXT4-fs: I/O error on journal device\n");
2647 goto out_journal;
2648 }
2649 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
2650 printk(KERN_ERR "EXT4-fs: External journal has more than one "
2651 "user (unsupported) - %d\n",
2652 be32_to_cpu(journal->j_superblock->s_nr_users));
2653 goto out_journal;
2654 }
2655 EXT4_SB(sb)->journal_bdev = bdev;
2656 ext4_init_journal_params(sb, journal);
2657 return journal;
2658 out_journal:
2659 jbd2_journal_destroy(journal);
2660 out_bdev:
2661 ext4_blkdev_put(bdev);
2662 return NULL;
2663 }
2664
2665 static int ext4_load_journal(struct super_block *sb,
2666 struct ext4_super_block *es,
2667 unsigned long journal_devnum)
2668 {
2669 journal_t *journal;
2670 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
2671 dev_t journal_dev;
2672 int err = 0;
2673 int really_read_only;
2674
2675 if (journal_devnum &&
2676 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2677 printk(KERN_INFO "EXT4-fs: external journal device major/minor "
2678 "numbers have changed\n");
2679 journal_dev = new_decode_dev(journal_devnum);
2680 } else
2681 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
2682
2683 really_read_only = bdev_read_only(sb->s_bdev);
2684
2685 /*
2686 * Are we loading a blank journal or performing recovery after a
2687 * crash? For recovery, we need to check in advance whether we
2688 * can get read-write access to the device.
2689 */
2690
2691 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
2692 if (sb->s_flags & MS_RDONLY) {
2693 printk(KERN_INFO "EXT4-fs: INFO: recovery "
2694 "required on readonly filesystem.\n");
2695 if (really_read_only) {
2696 printk(KERN_ERR "EXT4-fs: write access "
2697 "unavailable, cannot proceed.\n");
2698 return -EROFS;
2699 }
2700 printk (KERN_INFO "EXT4-fs: write access will "
2701 "be enabled during recovery.\n");
2702 }
2703 }
2704
2705 if (journal_inum && journal_dev) {
2706 printk(KERN_ERR "EXT4-fs: filesystem has both journal "
2707 "and inode journals!\n");
2708 return -EINVAL;
2709 }
2710
2711 if (journal_inum) {
2712 if (!(journal = ext4_get_journal(sb, journal_inum)))
2713 return -EINVAL;
2714 } else {
2715 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
2716 return -EINVAL;
2717 }
2718
2719 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
2720 err = jbd2_journal_update_format(journal);
2721 if (err) {
2722 printk(KERN_ERR "EXT4-fs: error updating journal.\n");
2723 jbd2_journal_destroy(journal);
2724 return err;
2725 }
2726 }
2727
2728 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
2729 err = jbd2_journal_wipe(journal, !really_read_only);
2730 if (!err)
2731 err = jbd2_journal_load(journal);
2732
2733 if (err) {
2734 printk(KERN_ERR "EXT4-fs: error loading journal.\n");
2735 jbd2_journal_destroy(journal);
2736 return err;
2737 }
2738
2739 EXT4_SB(sb)->s_journal = journal;
2740 ext4_clear_journal_err(sb, es);
2741
2742 if (journal_devnum &&
2743 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2744 es->s_journal_dev = cpu_to_le32(journal_devnum);
2745 sb->s_dirt = 1;
2746
2747 /* Make sure we flush the recovery flag to disk. */
2748 ext4_commit_super(sb, es, 1);
2749 }
2750
2751 return 0;
2752 }
2753
2754 static int ext4_create_journal(struct super_block * sb,
2755 struct ext4_super_block * es,
2756 unsigned int journal_inum)
2757 {
2758 journal_t *journal;
2759 int err;
2760
2761 if (sb->s_flags & MS_RDONLY) {
2762 printk(KERN_ERR "EXT4-fs: readonly filesystem when trying to "
2763 "create journal.\n");
2764 return -EROFS;
2765 }
2766
2767 journal = ext4_get_journal(sb, journal_inum);
2768 if (!journal)
2769 return -EINVAL;
2770
2771 printk(KERN_INFO "EXT4-fs: creating new journal on inode %u\n",
2772 journal_inum);
2773
2774 err = jbd2_journal_create(journal);
2775 if (err) {
2776 printk(KERN_ERR "EXT4-fs: error creating journal.\n");
2777 jbd2_journal_destroy(journal);
2778 return -EIO;
2779 }
2780
2781 EXT4_SB(sb)->s_journal = journal;
2782
2783 ext4_update_dynamic_rev(sb);
2784 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2785 EXT4_SET_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL);
2786
2787 es->s_journal_inum = cpu_to_le32(journal_inum);
2788 sb->s_dirt = 1;
2789
2790 /* Make sure we flush the recovery flag to disk. */
2791 ext4_commit_super(sb, es, 1);
2792
2793 return 0;
2794 }
2795
2796 static void ext4_commit_super (struct super_block * sb,
2797 struct ext4_super_block * es,
2798 int sync)
2799 {
2800 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
2801
2802 if (!sbh)
2803 return;
2804 es->s_wtime = cpu_to_le32(get_seconds());
2805 ext4_free_blocks_count_set(es, ext4_count_free_blocks(sb));
2806 es->s_free_inodes_count = cpu_to_le32(ext4_count_free_inodes(sb));
2807 BUFFER_TRACE(sbh, "marking dirty");
2808 mark_buffer_dirty(sbh);
2809 if (sync)
2810 sync_dirty_buffer(sbh);
2811 }
2812
2813
2814 /*
2815 * Have we just finished recovery? If so, and if we are mounting (or
2816 * remounting) the filesystem readonly, then we will end up with a
2817 * consistent fs on disk. Record that fact.
2818 */
2819 static void ext4_mark_recovery_complete(struct super_block * sb,
2820 struct ext4_super_block * es)
2821 {
2822 journal_t *journal = EXT4_SB(sb)->s_journal;
2823
2824 jbd2_journal_lock_updates(journal);
2825 jbd2_journal_flush(journal);
2826 lock_super(sb);
2827 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
2828 sb->s_flags & MS_RDONLY) {
2829 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2830 sb->s_dirt = 0;
2831 ext4_commit_super(sb, es, 1);
2832 }
2833 unlock_super(sb);
2834 jbd2_journal_unlock_updates(journal);
2835 }
2836
2837 /*
2838 * If we are mounting (or read-write remounting) a filesystem whose journal
2839 * has recorded an error from a previous lifetime, move that error to the
2840 * main filesystem now.
2841 */
2842 static void ext4_clear_journal_err(struct super_block * sb,
2843 struct ext4_super_block * es)
2844 {
2845 journal_t *journal;
2846 int j_errno;
2847 const char *errstr;
2848
2849 journal = EXT4_SB(sb)->s_journal;
2850
2851 /*
2852 * Now check for any error status which may have been recorded in the
2853 * journal by a prior ext4_error() or ext4_abort()
2854 */
2855
2856 j_errno = jbd2_journal_errno(journal);
2857 if (j_errno) {
2858 char nbuf[16];
2859
2860 errstr = ext4_decode_error(sb, j_errno, nbuf);
2861 ext4_warning(sb, __func__, "Filesystem error recorded "
2862 "from previous mount: %s", errstr);
2863 ext4_warning(sb, __func__, "Marking fs in need of "
2864 "filesystem check.");
2865
2866 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
2867 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
2868 ext4_commit_super (sb, es, 1);
2869
2870 jbd2_journal_clear_err(journal);
2871 }
2872 }
2873
2874 /*
2875 * Force the running and committing transactions to commit,
2876 * and wait on the commit.
2877 */
2878 int ext4_force_commit(struct super_block *sb)
2879 {
2880 journal_t *journal;
2881 int ret;
2882
2883 if (sb->s_flags & MS_RDONLY)
2884 return 0;
2885
2886 journal = EXT4_SB(sb)->s_journal;
2887 sb->s_dirt = 0;
2888 ret = ext4_journal_force_commit(journal);
2889 return ret;
2890 }
2891
2892 /*
2893 * Ext4 always journals updates to the superblock itself, so we don't
2894 * have to propagate any other updates to the superblock on disk at this
2895 * point. Just start an async writeback to get the buffers on their way
2896 * to the disk.
2897 *
2898 * This implicitly triggers the writebehind on sync().
2899 */
2900
2901 static void ext4_write_super (struct super_block * sb)
2902 {
2903 if (mutex_trylock(&sb->s_lock) != 0)
2904 BUG();
2905 sb->s_dirt = 0;
2906 }
2907
2908 static int ext4_sync_fs(struct super_block *sb, int wait)
2909 {
2910 tid_t target;
2911
2912 sb->s_dirt = 0;
2913 if (jbd2_journal_start_commit(EXT4_SB(sb)->s_journal, &target)) {
2914 if (wait)
2915 jbd2_log_wait_commit(EXT4_SB(sb)->s_journal, target);
2916 }
2917 return 0;
2918 }
2919
2920 /*
2921 * LVM calls this function before a (read-only) snapshot is created. This
2922 * gives us a chance to flush the journal completely and mark the fs clean.
2923 */
2924 static void ext4_write_super_lockfs(struct super_block *sb)
2925 {
2926 sb->s_dirt = 0;
2927
2928 if (!(sb->s_flags & MS_RDONLY)) {
2929 journal_t *journal = EXT4_SB(sb)->s_journal;
2930
2931 /* Now we set up the journal barrier. */
2932 jbd2_journal_lock_updates(journal);
2933 jbd2_journal_flush(journal);
2934
2935 /* Journal blocked and flushed, clear needs_recovery flag. */
2936 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2937 ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1);
2938 }
2939 }
2940
2941 /*
2942 * Called by LVM after the snapshot is done. We need to reset the RECOVER
2943 * flag here, even though the filesystem is not technically dirty yet.
2944 */
2945 static void ext4_unlockfs(struct super_block *sb)
2946 {
2947 if (!(sb->s_flags & MS_RDONLY)) {
2948 lock_super(sb);
2949 /* Reser the needs_recovery flag before the fs is unlocked. */
2950 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2951 ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1);
2952 unlock_super(sb);
2953 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
2954 }
2955 }
2956
2957 static int ext4_remount (struct super_block * sb, int * flags, char * data)
2958 {
2959 struct ext4_super_block * es;
2960 struct ext4_sb_info *sbi = EXT4_SB(sb);
2961 ext4_fsblk_t n_blocks_count = 0;
2962 unsigned long old_sb_flags;
2963 struct ext4_mount_options old_opts;
2964 int err;
2965 #ifdef CONFIG_QUOTA
2966 int i;
2967 #endif
2968
2969 /* Store the original options */
2970 old_sb_flags = sb->s_flags;
2971 old_opts.s_mount_opt = sbi->s_mount_opt;
2972 old_opts.s_resuid = sbi->s_resuid;
2973 old_opts.s_resgid = sbi->s_resgid;
2974 old_opts.s_commit_interval = sbi->s_commit_interval;
2975 #ifdef CONFIG_QUOTA
2976 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
2977 for (i = 0; i < MAXQUOTAS; i++)
2978 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
2979 #endif
2980
2981 /*
2982 * Allow the "check" option to be passed as a remount option.
2983 */
2984 if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
2985 err = -EINVAL;
2986 goto restore_opts;
2987 }
2988
2989 if (sbi->s_mount_opt & EXT4_MOUNT_ABORT)
2990 ext4_abort(sb, __func__, "Abort forced by user");
2991
2992 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
2993 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
2994
2995 es = sbi->s_es;
2996
2997 ext4_init_journal_params(sb, sbi->s_journal);
2998
2999 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
3000 n_blocks_count > ext4_blocks_count(es)) {
3001 if (sbi->s_mount_opt & EXT4_MOUNT_ABORT) {
3002 err = -EROFS;
3003 goto restore_opts;
3004 }
3005
3006 if (*flags & MS_RDONLY) {
3007 /*
3008 * First of all, the unconditional stuff we have to do
3009 * to disable replay of the journal when we next remount
3010 */
3011 sb->s_flags |= MS_RDONLY;
3012
3013 /*
3014 * OK, test if we are remounting a valid rw partition
3015 * readonly, and if so set the rdonly flag and then
3016 * mark the partition as valid again.
3017 */
3018 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
3019 (sbi->s_mount_state & EXT4_VALID_FS))
3020 es->s_state = cpu_to_le16(sbi->s_mount_state);
3021
3022 /*
3023 * We have to unlock super so that we can wait for
3024 * transactions.
3025 */
3026 unlock_super(sb);
3027 ext4_mark_recovery_complete(sb, es);
3028 lock_super(sb);
3029 } else {
3030 __le32 ret;
3031 if ((ret = EXT4_HAS_RO_COMPAT_FEATURE(sb,
3032 ~EXT4_FEATURE_RO_COMPAT_SUPP))) {
3033 printk(KERN_WARNING "EXT4-fs: %s: couldn't "
3034 "remount RDWR because of unsupported "
3035 "optional features (%x).\n",
3036 sb->s_id, le32_to_cpu(ret));
3037 err = -EROFS;
3038 goto restore_opts;
3039 }
3040
3041 /*
3042 * If we have an unprocessed orphan list hanging
3043 * around from a previously readonly bdev mount,
3044 * require a full umount/remount for now.
3045 */
3046 if (es->s_last_orphan) {
3047 printk(KERN_WARNING "EXT4-fs: %s: couldn't "
3048 "remount RDWR because of unprocessed "
3049 "orphan inode list. Please "
3050 "umount/remount instead.\n",
3051 sb->s_id);
3052 err = -EINVAL;
3053 goto restore_opts;
3054 }
3055
3056 /*
3057 * Mounting a RDONLY partition read-write, so reread
3058 * and store the current valid flag. (It may have
3059 * been changed by e2fsck since we originally mounted
3060 * the partition.)
3061 */
3062 ext4_clear_journal_err(sb, es);
3063 sbi->s_mount_state = le16_to_cpu(es->s_state);
3064 if ((err = ext4_group_extend(sb, es, n_blocks_count)))
3065 goto restore_opts;
3066 if (!ext4_setup_super (sb, es, 0))
3067 sb->s_flags &= ~MS_RDONLY;
3068 }
3069 }
3070 #ifdef CONFIG_QUOTA
3071 /* Release old quota file names */
3072 for (i = 0; i < MAXQUOTAS; i++)
3073 if (old_opts.s_qf_names[i] &&
3074 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
3075 kfree(old_opts.s_qf_names[i]);
3076 #endif
3077 return 0;
3078 restore_opts:
3079 sb->s_flags = old_sb_flags;
3080 sbi->s_mount_opt = old_opts.s_mount_opt;
3081 sbi->s_resuid = old_opts.s_resuid;
3082 sbi->s_resgid = old_opts.s_resgid;
3083 sbi->s_commit_interval = old_opts.s_commit_interval;
3084 #ifdef CONFIG_QUOTA
3085 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
3086 for (i = 0; i < MAXQUOTAS; i++) {
3087 if (sbi->s_qf_names[i] &&
3088 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
3089 kfree(sbi->s_qf_names[i]);
3090 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
3091 }
3092 #endif
3093 return err;
3094 }
3095
3096 static int ext4_statfs (struct dentry * dentry, struct kstatfs * buf)
3097 {
3098 struct super_block *sb = dentry->d_sb;
3099 struct ext4_sb_info *sbi = EXT4_SB(sb);
3100 struct ext4_super_block *es = sbi->s_es;
3101 u64 fsid;
3102
3103 if (test_opt(sb, MINIX_DF)) {
3104 sbi->s_overhead_last = 0;
3105 } else if (sbi->s_blocks_last != ext4_blocks_count(es)) {
3106 ext4_group_t ngroups = sbi->s_groups_count, i;
3107 ext4_fsblk_t overhead = 0;
3108 smp_rmb();
3109
3110 /*
3111 * Compute the overhead (FS structures). This is constant
3112 * for a given filesystem unless the number of block groups
3113 * changes so we cache the previous value until it does.
3114 */
3115
3116 /*
3117 * All of the blocks before first_data_block are
3118 * overhead
3119 */
3120 overhead = le32_to_cpu(es->s_first_data_block);
3121
3122 /*
3123 * Add the overhead attributed to the superblock and
3124 * block group descriptors. If the sparse superblocks
3125 * feature is turned on, then not all groups have this.
3126 */
3127 for (i = 0; i < ngroups; i++) {
3128 overhead += ext4_bg_has_super(sb, i) +
3129 ext4_bg_num_gdb(sb, i);
3130 cond_resched();
3131 }
3132
3133 /*
3134 * Every block group has an inode bitmap, a block
3135 * bitmap, and an inode table.
3136 */
3137 overhead += ngroups * (2 + sbi->s_itb_per_group);
3138 sbi->s_overhead_last = overhead;
3139 smp_wmb();
3140 sbi->s_blocks_last = ext4_blocks_count(es);
3141 }
3142
3143 buf->f_type = EXT4_SUPER_MAGIC;
3144 buf->f_bsize = sb->s_blocksize;
3145 buf->f_blocks = ext4_blocks_count(es) - sbi->s_overhead_last;
3146 buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter);
3147 ext4_free_blocks_count_set(es, buf->f_bfree);
3148 buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es);
3149 if (buf->f_bfree < ext4_r_blocks_count(es))
3150 buf->f_bavail = 0;
3151 buf->f_files = le32_to_cpu(es->s_inodes_count);
3152 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
3153 es->s_free_inodes_count = cpu_to_le32(buf->f_ffree);
3154 buf->f_namelen = EXT4_NAME_LEN;
3155 fsid = le64_to_cpup((void *)es->s_uuid) ^
3156 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
3157 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
3158 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
3159 return 0;
3160 }
3161
3162 /* Helper function for writing quotas on sync - we need to start transaction before quota file
3163 * is locked for write. Otherwise the are possible deadlocks:
3164 * Process 1 Process 2
3165 * ext4_create() quota_sync()
3166 * jbd2_journal_start() write_dquot()
3167 * DQUOT_INIT() down(dqio_mutex)
3168 * down(dqio_mutex) jbd2_journal_start()
3169 *
3170 */
3171
3172 #ifdef CONFIG_QUOTA
3173
3174 static inline struct inode *dquot_to_inode(struct dquot *dquot)
3175 {
3176 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
3177 }
3178
3179 static int ext4_dquot_initialize(struct inode *inode, int type)
3180 {
3181 handle_t *handle;
3182 int ret, err;
3183
3184 /* We may create quota structure so we need to reserve enough blocks */
3185 handle = ext4_journal_start(inode, 2*EXT4_QUOTA_INIT_BLOCKS(inode->i_sb));
3186 if (IS_ERR(handle))
3187 return PTR_ERR(handle);
3188 ret = dquot_initialize(inode, type);
3189 err = ext4_journal_stop(handle);
3190 if (!ret)
3191 ret = err;
3192 return ret;
3193 }
3194
3195 static int ext4_dquot_drop(struct inode *inode)
3196 {
3197 handle_t *handle;
3198 int ret, err;
3199
3200 /* We may delete quota structure so we need to reserve enough blocks */
3201 handle = ext4_journal_start(inode, 2*EXT4_QUOTA_DEL_BLOCKS(inode->i_sb));
3202 if (IS_ERR(handle)) {
3203 /*
3204 * We call dquot_drop() anyway to at least release references
3205 * to quota structures so that umount does not hang.
3206 */
3207 dquot_drop(inode);
3208 return PTR_ERR(handle);
3209 }
3210 ret = dquot_drop(inode);
3211 err = ext4_journal_stop(handle);
3212 if (!ret)
3213 ret = err;
3214 return ret;
3215 }
3216
3217 static int ext4_write_dquot(struct dquot *dquot)
3218 {
3219 int ret, err;
3220 handle_t *handle;
3221 struct inode *inode;
3222
3223 inode = dquot_to_inode(dquot);
3224 handle = ext4_journal_start(inode,
3225 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
3226 if (IS_ERR(handle))
3227 return PTR_ERR(handle);
3228 ret = dquot_commit(dquot);
3229 err = ext4_journal_stop(handle);
3230 if (!ret)
3231 ret = err;
3232 return ret;
3233 }
3234
3235 static int ext4_acquire_dquot(struct dquot *dquot)
3236 {
3237 int ret, err;
3238 handle_t *handle;
3239
3240 handle = ext4_journal_start(dquot_to_inode(dquot),
3241 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
3242 if (IS_ERR(handle))
3243 return PTR_ERR(handle);
3244 ret = dquot_acquire(dquot);
3245 err = ext4_journal_stop(handle);
3246 if (!ret)
3247 ret = err;
3248 return ret;
3249 }
3250
3251 static int ext4_release_dquot(struct dquot *dquot)
3252 {
3253 int ret, err;
3254 handle_t *handle;
3255
3256 handle = ext4_journal_start(dquot_to_inode(dquot),
3257 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
3258 if (IS_ERR(handle)) {
3259 /* Release dquot anyway to avoid endless cycle in dqput() */
3260 dquot_release(dquot);
3261 return PTR_ERR(handle);
3262 }
3263 ret = dquot_release(dquot);
3264 err = ext4_journal_stop(handle);
3265 if (!ret)
3266 ret = err;
3267 return ret;
3268 }
3269
3270 static int ext4_mark_dquot_dirty(struct dquot *dquot)
3271 {
3272 /* Are we journaling quotas? */
3273 if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
3274 EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
3275 dquot_mark_dquot_dirty(dquot);
3276 return ext4_write_dquot(dquot);
3277 } else {
3278 return dquot_mark_dquot_dirty(dquot);
3279 }
3280 }
3281
3282 static int ext4_write_info(struct super_block *sb, int type)
3283 {
3284 int ret, err;
3285 handle_t *handle;
3286
3287 /* Data block + inode block */
3288 handle = ext4_journal_start(sb->s_root->d_inode, 2);
3289 if (IS_ERR(handle))
3290 return PTR_ERR(handle);
3291 ret = dquot_commit_info(sb, type);
3292 err = ext4_journal_stop(handle);
3293 if (!ret)
3294 ret = err;
3295 return ret;
3296 }
3297
3298 /*
3299 * Turn on quotas during mount time - we need to find
3300 * the quota file and such...
3301 */
3302 static int ext4_quota_on_mount(struct super_block *sb, int type)
3303 {
3304 return vfs_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
3305 EXT4_SB(sb)->s_jquota_fmt, type);
3306 }
3307
3308 /*
3309 * Standard function to be called on quota_on
3310 */
3311 static int ext4_quota_on(struct super_block *sb, int type, int format_id,
3312 char *path, int remount)
3313 {
3314 int err;
3315 struct nameidata nd;
3316
3317 if (!test_opt(sb, QUOTA))
3318 return -EINVAL;
3319 /* When remounting, no checks are needed and in fact, path is NULL */
3320 if (remount)
3321 return vfs_quota_on(sb, type, format_id, path, remount);
3322
3323 err = path_lookup(path, LOOKUP_FOLLOW, &nd);
3324 if (err)
3325 return err;
3326
3327 /* Quotafile not on the same filesystem? */
3328 if (nd.path.mnt->mnt_sb != sb) {
3329 path_put(&nd.path);
3330 return -EXDEV;
3331 }
3332 /* Journaling quota? */
3333 if (EXT4_SB(sb)->s_qf_names[type]) {
3334 /* Quotafile not of fs root? */
3335 if (nd.path.dentry->d_parent->d_inode != sb->s_root->d_inode)
3336 printk(KERN_WARNING
3337 "EXT4-fs: Quota file not on filesystem root. "
3338 "Journaled quota will not work.\n");
3339 }
3340
3341 /*
3342 * When we journal data on quota file, we have to flush journal to see
3343 * all updates to the file when we bypass pagecache...
3344 */
3345 if (ext4_should_journal_data(nd.path.dentry->d_inode)) {
3346 /*
3347 * We don't need to lock updates but journal_flush() could
3348 * otherwise be livelocked...
3349 */
3350 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
3351 jbd2_journal_flush(EXT4_SB(sb)->s_journal);
3352 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
3353 }
3354
3355 path_put(&nd.path);
3356 return vfs_quota_on(sb, type, format_id, path, remount);
3357 }
3358
3359 /* Read data from quotafile - avoid pagecache and such because we cannot afford
3360 * acquiring the locks... As quota files are never truncated and quota code
3361 * itself serializes the operations (and noone else should touch the files)
3362 * we don't have to be afraid of races */
3363 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
3364 size_t len, loff_t off)
3365 {
3366 struct inode *inode = sb_dqopt(sb)->files[type];
3367 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
3368 int err = 0;
3369 int offset = off & (sb->s_blocksize - 1);
3370 int tocopy;
3371 size_t toread;
3372 struct buffer_head *bh;
3373 loff_t i_size = i_size_read(inode);
3374
3375 if (off > i_size)
3376 return 0;
3377 if (off+len > i_size)
3378 len = i_size-off;
3379 toread = len;
3380 while (toread > 0) {
3381 tocopy = sb->s_blocksize - offset < toread ?
3382 sb->s_blocksize - offset : toread;
3383 bh = ext4_bread(NULL, inode, blk, 0, &err);
3384 if (err)
3385 return err;
3386 if (!bh) /* A hole? */
3387 memset(data, 0, tocopy);
3388 else
3389 memcpy(data, bh->b_data+offset, tocopy);
3390 brelse(bh);
3391 offset = 0;
3392 toread -= tocopy;
3393 data += tocopy;
3394 blk++;
3395 }
3396 return len;
3397 }
3398
3399 /* Write to quotafile (we know the transaction is already started and has
3400 * enough credits) */
3401 static ssize_t ext4_quota_write(struct super_block *sb, int type,
3402 const char *data, size_t len, loff_t off)
3403 {
3404 struct inode *inode = sb_dqopt(sb)->files[type];
3405 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
3406 int err = 0;
3407 int offset = off & (sb->s_blocksize - 1);
3408 int tocopy;
3409 int journal_quota = EXT4_SB(sb)->s_qf_names[type] != NULL;
3410 size_t towrite = len;
3411 struct buffer_head *bh;
3412 handle_t *handle = journal_current_handle();
3413
3414 if (!handle) {
3415 printk(KERN_WARNING "EXT4-fs: Quota write (off=%Lu, len=%Lu)"
3416 " cancelled because transaction is not started.\n",
3417 (unsigned long long)off, (unsigned long long)len);
3418 return -EIO;
3419 }
3420 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
3421 while (towrite > 0) {
3422 tocopy = sb->s_blocksize - offset < towrite ?
3423 sb->s_blocksize - offset : towrite;
3424 bh = ext4_bread(handle, inode, blk, 1, &err);
3425 if (!bh)
3426 goto out;
3427 if (journal_quota) {
3428 err = ext4_journal_get_write_access(handle, bh);
3429 if (err) {
3430 brelse(bh);
3431 goto out;
3432 }
3433 }
3434 lock_buffer(bh);
3435 memcpy(bh->b_data+offset, data, tocopy);
3436 flush_dcache_page(bh->b_page);
3437 unlock_buffer(bh);
3438 if (journal_quota)
3439 err = ext4_journal_dirty_metadata(handle, bh);
3440 else {
3441 /* Always do at least ordered writes for quotas */
3442 err = ext4_jbd2_file_inode(handle, inode);
3443 mark_buffer_dirty(bh);
3444 }
3445 brelse(bh);
3446 if (err)
3447 goto out;
3448 offset = 0;
3449 towrite -= tocopy;
3450 data += tocopy;
3451 blk++;
3452 }
3453 out:
3454 if (len == towrite) {
3455 mutex_unlock(&inode->i_mutex);
3456 return err;
3457 }
3458 if (inode->i_size < off+len-towrite) {
3459 i_size_write(inode, off+len-towrite);
3460 EXT4_I(inode)->i_disksize = inode->i_size;
3461 }
3462 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
3463 ext4_mark_inode_dirty(handle, inode);
3464 mutex_unlock(&inode->i_mutex);
3465 return len - towrite;
3466 }
3467
3468 #endif
3469
3470 static int ext4_get_sb(struct file_system_type *fs_type,
3471 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
3472 {
3473 return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super, mnt);
3474 }
3475
3476 static struct file_system_type ext4dev_fs_type = {
3477 .owner = THIS_MODULE,
3478 .name = "ext4dev",
3479 .get_sb = ext4_get_sb,
3480 .kill_sb = kill_block_super,
3481 .fs_flags = FS_REQUIRES_DEV,
3482 };
3483
3484 static int __init init_ext4_fs(void)
3485 {
3486 int err;
3487
3488 err = init_ext4_mballoc();
3489 if (err)
3490 return err;
3491
3492 err = init_ext4_xattr();
3493 if (err)
3494 goto out2;
3495 err = init_inodecache();
3496 if (err)
3497 goto out1;
3498 err = register_filesystem(&ext4dev_fs_type);
3499 if (err)
3500 goto out;
3501 return 0;
3502 out:
3503 destroy_inodecache();
3504 out1:
3505 exit_ext4_xattr();
3506 out2:
3507 exit_ext4_mballoc();
3508 return err;
3509 }
3510
3511 static void __exit exit_ext4_fs(void)
3512 {
3513 unregister_filesystem(&ext4dev_fs_type);
3514 destroy_inodecache();
3515 exit_ext4_xattr();
3516 exit_ext4_mballoc();
3517 }
3518
3519 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
3520 MODULE_DESCRIPTION("Fourth Extended Filesystem with extents");
3521 MODULE_LICENSE("GPL");
3522 module_init(init_ext4_fs)
3523 module_exit(exit_ext4_fs)
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