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ext4: move headers out of include/linux
[linux-2.6/btrfs-unstable.git] / fs / ext4 / super.c
blob3435184114c4fb008c07890e078335afa356ef1a
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 if (!(sb->s_flags & MS_RDONLY)) {
510 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
511 es->s_state = cpu_to_le16(sbi->s_mount_state);
512 BUFFER_TRACE(sbi->s_sbh, "marking dirty");
513 mark_buffer_dirty(sbi->s_sbh);
514 ext4_commit_super(sb, es, 1);
515 }
516
517 for (i = 0; i < sbi->s_gdb_count; i++)
518 brelse(sbi->s_group_desc[i]);
519 kfree(sbi->s_group_desc);
520 percpu_counter_destroy(&sbi->s_freeblocks_counter);
521 percpu_counter_destroy(&sbi->s_freeinodes_counter);
522 percpu_counter_destroy(&sbi->s_dirs_counter);
523 brelse(sbi->s_sbh);
524 #ifdef CONFIG_QUOTA
525 for (i = 0; i < MAXQUOTAS; i++)
526 kfree(sbi->s_qf_names[i]);
527 #endif
528
529 /* Debugging code just in case the in-memory inode orphan list
530 * isn't empty. The on-disk one can be non-empty if we've
531 * detected an error and taken the fs readonly, but the
532 * in-memory list had better be clean by this point. */
533 if (!list_empty(&sbi->s_orphan))
534 dump_orphan_list(sb, sbi);
535 J_ASSERT(list_empty(&sbi->s_orphan));
536
537 invalidate_bdev(sb->s_bdev);
538 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
539 /*
540 * Invalidate the journal device's buffers. We don't want them
541 * floating about in memory - the physical journal device may
542 * hotswapped, and it breaks the `ro-after' testing code.
543 */
544 sync_blockdev(sbi->journal_bdev);
545 invalidate_bdev(sbi->journal_bdev);
546 ext4_blkdev_remove(sbi);
547 }
548 sb->s_fs_info = NULL;
549 kfree(sbi);
550 return;
551 }
552
553 static struct kmem_cache *ext4_inode_cachep;
554
555 /*
556 * Called inside transaction, so use GFP_NOFS
557 */
558 static struct inode *ext4_alloc_inode(struct super_block *sb)
559 {
560 struct ext4_inode_info *ei;
561
562 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
563 if (!ei)
564 return NULL;
565 #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
566 ei->i_acl = EXT4_ACL_NOT_CACHED;
567 ei->i_default_acl = EXT4_ACL_NOT_CACHED;
568 #endif
569 ei->i_block_alloc_info = NULL;
570 ei->vfs_inode.i_version = 1;
571 memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache));
572 INIT_LIST_HEAD(&ei->i_prealloc_list);
573 spin_lock_init(&ei->i_prealloc_lock);
574 return &ei->vfs_inode;
575 }
576
577 static void ext4_destroy_inode(struct inode *inode)
578 {
579 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
580 printk("EXT4 Inode %p: orphan list check failed!\n",
581 EXT4_I(inode));
582 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
583 EXT4_I(inode), sizeof(struct ext4_inode_info),
584 true);
585 dump_stack();
586 }
587 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
588 }
589
590 static void init_once(struct kmem_cache *cachep, void *foo)
591 {
592 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
593
594 INIT_LIST_HEAD(&ei->i_orphan);
595 #ifdef CONFIG_EXT4DEV_FS_XATTR
596 init_rwsem(&ei->xattr_sem);
597 #endif
598 init_rwsem(&ei->i_data_sem);
599 inode_init_once(&ei->vfs_inode);
600 }
601
602 static int init_inodecache(void)
603 {
604 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
605 sizeof(struct ext4_inode_info),
606 0, (SLAB_RECLAIM_ACCOUNT|
607 SLAB_MEM_SPREAD),
608 init_once);
609 if (ext4_inode_cachep == NULL)
610 return -ENOMEM;
611 return 0;
612 }
613
614 static void destroy_inodecache(void)
615 {
616 kmem_cache_destroy(ext4_inode_cachep);
617 }
618
619 static void ext4_clear_inode(struct inode *inode)
620 {
621 struct ext4_block_alloc_info *rsv = EXT4_I(inode)->i_block_alloc_info;
622 #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
623 if (EXT4_I(inode)->i_acl &&
624 EXT4_I(inode)->i_acl != EXT4_ACL_NOT_CACHED) {
625 posix_acl_release(EXT4_I(inode)->i_acl);
626 EXT4_I(inode)->i_acl = EXT4_ACL_NOT_CACHED;
627 }
628 if (EXT4_I(inode)->i_default_acl &&
629 EXT4_I(inode)->i_default_acl != EXT4_ACL_NOT_CACHED) {
630 posix_acl_release(EXT4_I(inode)->i_default_acl);
631 EXT4_I(inode)->i_default_acl = EXT4_ACL_NOT_CACHED;
632 }
633 #endif
634 ext4_discard_reservation(inode);
635 EXT4_I(inode)->i_block_alloc_info = NULL;
636 if (unlikely(rsv))
637 kfree(rsv);
638 }
639
640 static inline void ext4_show_quota_options(struct seq_file *seq, struct super_block *sb)
641 {
642 #if defined(CONFIG_QUOTA)
643 struct ext4_sb_info *sbi = EXT4_SB(sb);
644
645 if (sbi->s_jquota_fmt)
646 seq_printf(seq, ",jqfmt=%s",
647 (sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold": "vfsv0");
648
649 if (sbi->s_qf_names[USRQUOTA])
650 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
651
652 if (sbi->s_qf_names[GRPQUOTA])
653 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
654
655 if (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA)
656 seq_puts(seq, ",usrquota");
657
658 if (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)
659 seq_puts(seq, ",grpquota");
660 #endif
661 }
662
663 /*
664 * Show an option if
665 * - it's set to a non-default value OR
666 * - if the per-sb default is different from the global default
667 */
668 static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs)
669 {
670 int def_errors;
671 unsigned long def_mount_opts;
672 struct super_block *sb = vfs->mnt_sb;
673 struct ext4_sb_info *sbi = EXT4_SB(sb);
674 struct ext4_super_block *es = sbi->s_es;
675
676 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
677 def_errors = le16_to_cpu(es->s_errors);
678
679 if (sbi->s_sb_block != 1)
680 seq_printf(seq, ",sb=%llu", sbi->s_sb_block);
681 if (test_opt(sb, MINIX_DF))
682 seq_puts(seq, ",minixdf");
683 if (test_opt(sb, GRPID) && !(def_mount_opts & EXT4_DEFM_BSDGROUPS))
684 seq_puts(seq, ",grpid");
685 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT4_DEFM_BSDGROUPS))
686 seq_puts(seq, ",nogrpid");
687 if (sbi->s_resuid != EXT4_DEF_RESUID ||
688 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID) {
689 seq_printf(seq, ",resuid=%u", sbi->s_resuid);
690 }
691 if (sbi->s_resgid != EXT4_DEF_RESGID ||
692 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID) {
693 seq_printf(seq, ",resgid=%u", sbi->s_resgid);
694 }
695 if (test_opt(sb, ERRORS_RO)) {
696 if (def_errors == EXT4_ERRORS_PANIC ||
697 def_errors == EXT4_ERRORS_CONTINUE) {
698 seq_puts(seq, ",errors=remount-ro");
699 }
700 }
701 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
702 seq_puts(seq, ",errors=continue");
703 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
704 seq_puts(seq, ",errors=panic");
705 if (test_opt(sb, NO_UID32) && !(def_mount_opts & EXT4_DEFM_UID16))
706 seq_puts(seq, ",nouid32");
707 if (test_opt(sb, DEBUG) && !(def_mount_opts & EXT4_DEFM_DEBUG))
708 seq_puts(seq, ",debug");
709 if (test_opt(sb, OLDALLOC))
710 seq_puts(seq, ",oldalloc");
711 #ifdef CONFIG_EXT4DEV_FS_XATTR
712 if (test_opt(sb, XATTR_USER) &&
713 !(def_mount_opts & EXT4_DEFM_XATTR_USER))
714 seq_puts(seq, ",user_xattr");
715 if (!test_opt(sb, XATTR_USER) &&
716 (def_mount_opts & EXT4_DEFM_XATTR_USER)) {
717 seq_puts(seq, ",nouser_xattr");
718 }
719 #endif
720 #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
721 if (test_opt(sb, POSIX_ACL) && !(def_mount_opts & EXT4_DEFM_ACL))
722 seq_puts(seq, ",acl");
723 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT4_DEFM_ACL))
724 seq_puts(seq, ",noacl");
725 #endif
726 if (!test_opt(sb, RESERVATION))
727 seq_puts(seq, ",noreservation");
728 if (sbi->s_commit_interval) {
729 seq_printf(seq, ",commit=%u",
730 (unsigned) (sbi->s_commit_interval / HZ));
731 }
732 if (test_opt(sb, BARRIER))
733 seq_puts(seq, ",barrier=1");
734 if (test_opt(sb, NOBH))
735 seq_puts(seq, ",nobh");
736 if (!test_opt(sb, EXTENTS))
737 seq_puts(seq, ",noextents");
738 if (!test_opt(sb, MBALLOC))
739 seq_puts(seq, ",nomballoc");
740 if (test_opt(sb, I_VERSION))
741 seq_puts(seq, ",i_version");
742
743 if (sbi->s_stripe)
744 seq_printf(seq, ",stripe=%lu", sbi->s_stripe);
745 /*
746 * journal mode get enabled in different ways
747 * So just print the value even if we didn't specify it
748 */
749 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
750 seq_puts(seq, ",data=journal");
751 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
752 seq_puts(seq, ",data=ordered");
753 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
754 seq_puts(seq, ",data=writeback");
755
756 ext4_show_quota_options(seq, sb);
757 return 0;
758 }
759
760
761 static struct inode *ext4_nfs_get_inode(struct super_block *sb,
762 u64 ino, u32 generation)
763 {
764 struct inode *inode;
765
766 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
767 return ERR_PTR(-ESTALE);
768 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
769 return ERR_PTR(-ESTALE);
770
771 /* iget isn't really right if the inode is currently unallocated!!
772 *
773 * ext4_read_inode will return a bad_inode if the inode had been
774 * deleted, so we should be safe.
775 *
776 * Currently we don't know the generation for parent directory, so
777 * a generation of 0 means "accept any"
778 */
779 inode = ext4_iget(sb, ino);
780 if (IS_ERR(inode))
781 return ERR_CAST(inode);
782 if (generation && inode->i_generation != generation) {
783 iput(inode);
784 return ERR_PTR(-ESTALE);
785 }
786
787 return inode;
788 }
789
790 static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
791 int fh_len, int fh_type)
792 {
793 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
794 ext4_nfs_get_inode);
795 }
796
797 static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
798 int fh_len, int fh_type)
799 {
800 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
801 ext4_nfs_get_inode);
802 }
803
804 #ifdef CONFIG_QUOTA
805 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
806 #define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
807
808 static int ext4_dquot_initialize(struct inode *inode, int type);
809 static int ext4_dquot_drop(struct inode *inode);
810 static int ext4_write_dquot(struct dquot *dquot);
811 static int ext4_acquire_dquot(struct dquot *dquot);
812 static int ext4_release_dquot(struct dquot *dquot);
813 static int ext4_mark_dquot_dirty(struct dquot *dquot);
814 static int ext4_write_info(struct super_block *sb, int type);
815 static int ext4_quota_on(struct super_block *sb, int type, int format_id,
816 char *path, int remount);
817 static int ext4_quota_on_mount(struct super_block *sb, int type);
818 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
819 size_t len, loff_t off);
820 static ssize_t ext4_quota_write(struct super_block *sb, int type,
821 const char *data, size_t len, loff_t off);
822
823 static struct dquot_operations ext4_quota_operations = {
824 .initialize = ext4_dquot_initialize,
825 .drop = ext4_dquot_drop,
826 .alloc_space = dquot_alloc_space,
827 .alloc_inode = dquot_alloc_inode,
828 .free_space = dquot_free_space,
829 .free_inode = dquot_free_inode,
830 .transfer = dquot_transfer,
831 .write_dquot = ext4_write_dquot,
832 .acquire_dquot = ext4_acquire_dquot,
833 .release_dquot = ext4_release_dquot,
834 .mark_dirty = ext4_mark_dquot_dirty,
835 .write_info = ext4_write_info
836 };
837
838 static struct quotactl_ops ext4_qctl_operations = {
839 .quota_on = ext4_quota_on,
840 .quota_off = vfs_quota_off,
841 .quota_sync = vfs_quota_sync,
842 .get_info = vfs_get_dqinfo,
843 .set_info = vfs_set_dqinfo,
844 .get_dqblk = vfs_get_dqblk,
845 .set_dqblk = vfs_set_dqblk
846 };
847 #endif
848
849 static const struct super_operations ext4_sops = {
850 .alloc_inode = ext4_alloc_inode,
851 .destroy_inode = ext4_destroy_inode,
852 .write_inode = ext4_write_inode,
853 .dirty_inode = ext4_dirty_inode,
854 .delete_inode = ext4_delete_inode,
855 .put_super = ext4_put_super,
856 .write_super = ext4_write_super,
857 .sync_fs = ext4_sync_fs,
858 .write_super_lockfs = ext4_write_super_lockfs,
859 .unlockfs = ext4_unlockfs,
860 .statfs = ext4_statfs,
861 .remount_fs = ext4_remount,
862 .clear_inode = ext4_clear_inode,
863 .show_options = ext4_show_options,
864 #ifdef CONFIG_QUOTA
865 .quota_read = ext4_quota_read,
866 .quota_write = ext4_quota_write,
867 #endif
868 };
869
870 static const struct export_operations ext4_export_ops = {
871 .fh_to_dentry = ext4_fh_to_dentry,
872 .fh_to_parent = ext4_fh_to_parent,
873 .get_parent = ext4_get_parent,
874 };
875
876 enum {
877 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
878 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
879 Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
880 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
881 Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh,
882 Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
883 Opt_journal_checksum, Opt_journal_async_commit,
884 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
885 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
886 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota,
887 Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota,
888 Opt_grpquota, Opt_extents, Opt_noextents, Opt_i_version,
889 Opt_mballoc, Opt_nomballoc, Opt_stripe,
890 };
891
892 static match_table_t tokens = {
893 {Opt_bsd_df, "bsddf"},
894 {Opt_minix_df, "minixdf"},
895 {Opt_grpid, "grpid"},
896 {Opt_grpid, "bsdgroups"},
897 {Opt_nogrpid, "nogrpid"},
898 {Opt_nogrpid, "sysvgroups"},
899 {Opt_resgid, "resgid=%u"},
900 {Opt_resuid, "resuid=%u"},
901 {Opt_sb, "sb=%u"},
902 {Opt_err_cont, "errors=continue"},
903 {Opt_err_panic, "errors=panic"},
904 {Opt_err_ro, "errors=remount-ro"},
905 {Opt_nouid32, "nouid32"},
906 {Opt_nocheck, "nocheck"},
907 {Opt_nocheck, "check=none"},
908 {Opt_debug, "debug"},
909 {Opt_oldalloc, "oldalloc"},
910 {Opt_orlov, "orlov"},
911 {Opt_user_xattr, "user_xattr"},
912 {Opt_nouser_xattr, "nouser_xattr"},
913 {Opt_acl, "acl"},
914 {Opt_noacl, "noacl"},
915 {Opt_reservation, "reservation"},
916 {Opt_noreservation, "noreservation"},
917 {Opt_noload, "noload"},
918 {Opt_nobh, "nobh"},
919 {Opt_bh, "bh"},
920 {Opt_commit, "commit=%u"},
921 {Opt_journal_update, "journal=update"},
922 {Opt_journal_inum, "journal=%u"},
923 {Opt_journal_dev, "journal_dev=%u"},
924 {Opt_journal_checksum, "journal_checksum"},
925 {Opt_journal_async_commit, "journal_async_commit"},
926 {Opt_abort, "abort"},
927 {Opt_data_journal, "data=journal"},
928 {Opt_data_ordered, "data=ordered"},
929 {Opt_data_writeback, "data=writeback"},
930 {Opt_offusrjquota, "usrjquota="},
931 {Opt_usrjquota, "usrjquota=%s"},
932 {Opt_offgrpjquota, "grpjquota="},
933 {Opt_grpjquota, "grpjquota=%s"},
934 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
935 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
936 {Opt_grpquota, "grpquota"},
937 {Opt_noquota, "noquota"},
938 {Opt_quota, "quota"},
939 {Opt_usrquota, "usrquota"},
940 {Opt_barrier, "barrier=%u"},
941 {Opt_extents, "extents"},
942 {Opt_noextents, "noextents"},
943 {Opt_i_version, "i_version"},
944 {Opt_mballoc, "mballoc"},
945 {Opt_nomballoc, "nomballoc"},
946 {Opt_stripe, "stripe=%u"},
947 {Opt_resize, "resize"},
948 {Opt_err, NULL},
949 };
950
951 static ext4_fsblk_t get_sb_block(void **data)
952 {
953 ext4_fsblk_t sb_block;
954 char *options = (char *) *data;
955
956 if (!options || strncmp(options, "sb=", 3) != 0)
957 return 1; /* Default location */
958 options += 3;
959 /*todo: use simple_strtoll with >32bit ext4 */
960 sb_block = simple_strtoul(options, &options, 0);
961 if (*options && *options != ',') {
962 printk("EXT4-fs: Invalid sb specification: %s\n",
963 (char *) *data);
964 return 1;
965 }
966 if (*options == ',')
967 options++;
968 *data = (void *) options;
969 return sb_block;
970 }
971
972 static int parse_options (char *options, struct super_block *sb,
973 unsigned int *inum, unsigned long *journal_devnum,
974 ext4_fsblk_t *n_blocks_count, int is_remount)
975 {
976 struct ext4_sb_info *sbi = EXT4_SB(sb);
977 char * p;
978 substring_t args[MAX_OPT_ARGS];
979 int data_opt = 0;
980 int option;
981 #ifdef CONFIG_QUOTA
982 int qtype;
983 char *qname;
984 #endif
985
986 if (!options)
987 return 1;
988
989 while ((p = strsep (&options, ",")) != NULL) {
990 int token;
991 if (!*p)
992 continue;
993
994 token = match_token(p, tokens, args);
995 switch (token) {
996 case Opt_bsd_df:
997 clear_opt (sbi->s_mount_opt, MINIX_DF);
998 break;
999 case Opt_minix_df:
1000 set_opt (sbi->s_mount_opt, MINIX_DF);
1001 break;
1002 case Opt_grpid:
1003 set_opt (sbi->s_mount_opt, GRPID);
1004 break;
1005 case Opt_nogrpid:
1006 clear_opt (sbi->s_mount_opt, GRPID);
1007 break;
1008 case Opt_resuid:
1009 if (match_int(&args[0], &option))
1010 return 0;
1011 sbi->s_resuid = option;
1012 break;
1013 case Opt_resgid:
1014 if (match_int(&args[0], &option))
1015 return 0;
1016 sbi->s_resgid = option;
1017 break;
1018 case Opt_sb:
1019 /* handled by get_sb_block() instead of here */
1020 /* *sb_block = match_int(&args[0]); */
1021 break;
1022 case Opt_err_panic:
1023 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
1024 clear_opt (sbi->s_mount_opt, ERRORS_RO);
1025 set_opt (sbi->s_mount_opt, ERRORS_PANIC);
1026 break;
1027 case Opt_err_ro:
1028 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
1029 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
1030 set_opt (sbi->s_mount_opt, ERRORS_RO);
1031 break;
1032 case Opt_err_cont:
1033 clear_opt (sbi->s_mount_opt, ERRORS_RO);
1034 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
1035 set_opt (sbi->s_mount_opt, ERRORS_CONT);
1036 break;
1037 case Opt_nouid32:
1038 set_opt (sbi->s_mount_opt, NO_UID32);
1039 break;
1040 case Opt_nocheck:
1041 clear_opt (sbi->s_mount_opt, CHECK);
1042 break;
1043 case Opt_debug:
1044 set_opt (sbi->s_mount_opt, DEBUG);
1045 break;
1046 case Opt_oldalloc:
1047 set_opt (sbi->s_mount_opt, OLDALLOC);
1048 break;
1049 case Opt_orlov:
1050 clear_opt (sbi->s_mount_opt, OLDALLOC);
1051 break;
1052 #ifdef CONFIG_EXT4DEV_FS_XATTR
1053 case Opt_user_xattr:
1054 set_opt (sbi->s_mount_opt, XATTR_USER);
1055 break;
1056 case Opt_nouser_xattr:
1057 clear_opt (sbi->s_mount_opt, XATTR_USER);
1058 break;
1059 #else
1060 case Opt_user_xattr:
1061 case Opt_nouser_xattr:
1062 printk("EXT4 (no)user_xattr options not supported\n");
1063 break;
1064 #endif
1065 #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
1066 case Opt_acl:
1067 set_opt(sbi->s_mount_opt, POSIX_ACL);
1068 break;
1069 case Opt_noacl:
1070 clear_opt(sbi->s_mount_opt, POSIX_ACL);
1071 break;
1072 #else
1073 case Opt_acl:
1074 case Opt_noacl:
1075 printk("EXT4 (no)acl options not supported\n");
1076 break;
1077 #endif
1078 case Opt_reservation:
1079 set_opt(sbi->s_mount_opt, RESERVATION);
1080 break;
1081 case Opt_noreservation:
1082 clear_opt(sbi->s_mount_opt, RESERVATION);
1083 break;
1084 case Opt_journal_update:
1085 /* @@@ FIXME */
1086 /* Eventually we will want to be able to create
1087 a journal file here. For now, only allow the
1088 user to specify an existing inode to be the
1089 journal file. */
1090 if (is_remount) {
1091 printk(KERN_ERR "EXT4-fs: cannot specify "
1092 "journal on remount\n");
1093 return 0;
1094 }
1095 set_opt (sbi->s_mount_opt, UPDATE_JOURNAL);
1096 break;
1097 case Opt_journal_inum:
1098 if (is_remount) {
1099 printk(KERN_ERR "EXT4-fs: cannot specify "
1100 "journal on remount\n");
1101 return 0;
1102 }
1103 if (match_int(&args[0], &option))
1104 return 0;
1105 *inum = option;
1106 break;
1107 case Opt_journal_dev:
1108 if (is_remount) {
1109 printk(KERN_ERR "EXT4-fs: cannot specify "
1110 "journal on remount\n");
1111 return 0;
1112 }
1113 if (match_int(&args[0], &option))
1114 return 0;
1115 *journal_devnum = option;
1116 break;
1117 case Opt_journal_checksum:
1118 set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM);
1119 break;
1120 case Opt_journal_async_commit:
1121 set_opt(sbi->s_mount_opt, JOURNAL_ASYNC_COMMIT);
1122 set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM);
1123 break;
1124 case Opt_noload:
1125 set_opt (sbi->s_mount_opt, NOLOAD);
1126 break;
1127 case Opt_commit:
1128 if (match_int(&args[0], &option))
1129 return 0;
1130 if (option < 0)
1131 return 0;
1132 if (option == 0)
1133 option = JBD2_DEFAULT_MAX_COMMIT_AGE;
1134 sbi->s_commit_interval = HZ * option;
1135 break;
1136 case Opt_data_journal:
1137 data_opt = EXT4_MOUNT_JOURNAL_DATA;
1138 goto datacheck;
1139 case Opt_data_ordered:
1140 data_opt = EXT4_MOUNT_ORDERED_DATA;
1141 goto datacheck;
1142 case Opt_data_writeback:
1143 data_opt = EXT4_MOUNT_WRITEBACK_DATA;
1144 datacheck:
1145 if (is_remount) {
1146 if ((sbi->s_mount_opt & EXT4_MOUNT_DATA_FLAGS)
1147 != data_opt) {
1148 printk(KERN_ERR
1149 "EXT4-fs: cannot change data "
1150 "mode on remount\n");
1151 return 0;
1152 }
1153 } else {
1154 sbi->s_mount_opt &= ~EXT4_MOUNT_DATA_FLAGS;
1155 sbi->s_mount_opt |= data_opt;
1156 }
1157 break;
1158 #ifdef CONFIG_QUOTA
1159 case Opt_usrjquota:
1160 qtype = USRQUOTA;
1161 goto set_qf_name;
1162 case Opt_grpjquota:
1163 qtype = GRPQUOTA;
1164 set_qf_name:
1165 if (sb_any_quota_enabled(sb)) {
1166 printk(KERN_ERR
1167 "EXT4-fs: Cannot change journalled "
1168 "quota options when quota turned on.\n");
1169 return 0;
1170 }
1171 qname = match_strdup(&args[0]);
1172 if (!qname) {
1173 printk(KERN_ERR
1174 "EXT4-fs: not enough memory for "
1175 "storing quotafile name.\n");
1176 return 0;
1177 }
1178 if (sbi->s_qf_names[qtype] &&
1179 strcmp(sbi->s_qf_names[qtype], qname)) {
1180 printk(KERN_ERR
1181 "EXT4-fs: %s quota file already "
1182 "specified.\n", QTYPE2NAME(qtype));
1183 kfree(qname);
1184 return 0;
1185 }
1186 sbi->s_qf_names[qtype] = qname;
1187 if (strchr(sbi->s_qf_names[qtype], '/')) {
1188 printk(KERN_ERR
1189 "EXT4-fs: quotafile must be on "
1190 "filesystem root.\n");
1191 kfree(sbi->s_qf_names[qtype]);
1192 sbi->s_qf_names[qtype] = NULL;
1193 return 0;
1194 }
1195 set_opt(sbi->s_mount_opt, QUOTA);
1196 break;
1197 case Opt_offusrjquota:
1198 qtype = USRQUOTA;
1199 goto clear_qf_name;
1200 case Opt_offgrpjquota:
1201 qtype = GRPQUOTA;
1202 clear_qf_name:
1203 if (sb_any_quota_enabled(sb)) {
1204 printk(KERN_ERR "EXT4-fs: Cannot change "
1205 "journalled quota options when "
1206 "quota turned on.\n");
1207 return 0;
1208 }
1209 /*
1210 * The space will be released later when all options
1211 * are confirmed to be correct
1212 */
1213 sbi->s_qf_names[qtype] = NULL;
1214 break;
1215 case Opt_jqfmt_vfsold:
1216 sbi->s_jquota_fmt = QFMT_VFS_OLD;
1217 break;
1218 case Opt_jqfmt_vfsv0:
1219 sbi->s_jquota_fmt = QFMT_VFS_V0;
1220 break;
1221 case Opt_quota:
1222 case Opt_usrquota:
1223 set_opt(sbi->s_mount_opt, QUOTA);
1224 set_opt(sbi->s_mount_opt, USRQUOTA);
1225 break;
1226 case Opt_grpquota:
1227 set_opt(sbi->s_mount_opt, QUOTA);
1228 set_opt(sbi->s_mount_opt, GRPQUOTA);
1229 break;
1230 case Opt_noquota:
1231 if (sb_any_quota_enabled(sb)) {
1232 printk(KERN_ERR "EXT4-fs: Cannot change quota "
1233 "options when quota turned on.\n");
1234 return 0;
1235 }
1236 clear_opt(sbi->s_mount_opt, QUOTA);
1237 clear_opt(sbi->s_mount_opt, USRQUOTA);
1238 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1239 break;
1240 #else
1241 case Opt_quota:
1242 case Opt_usrquota:
1243 case Opt_grpquota:
1244 case Opt_usrjquota:
1245 case Opt_grpjquota:
1246 case Opt_offusrjquota:
1247 case Opt_offgrpjquota:
1248 case Opt_jqfmt_vfsold:
1249 case Opt_jqfmt_vfsv0:
1250 printk(KERN_ERR
1251 "EXT4-fs: journalled quota options not "
1252 "supported.\n");
1253 break;
1254 case Opt_noquota:
1255 break;
1256 #endif
1257 case Opt_abort:
1258 set_opt(sbi->s_mount_opt, ABORT);
1259 break;
1260 case Opt_barrier:
1261 if (match_int(&args[0], &option))
1262 return 0;
1263 if (option)
1264 set_opt(sbi->s_mount_opt, BARRIER);
1265 else
1266 clear_opt(sbi->s_mount_opt, BARRIER);
1267 break;
1268 case Opt_ignore:
1269 break;
1270 case Opt_resize:
1271 if (!is_remount) {
1272 printk("EXT4-fs: resize option only available "
1273 "for remount\n");
1274 return 0;
1275 }
1276 if (match_int(&args[0], &option) != 0)
1277 return 0;
1278 *n_blocks_count = option;
1279 break;
1280 case Opt_nobh:
1281 set_opt(sbi->s_mount_opt, NOBH);
1282 break;
1283 case Opt_bh:
1284 clear_opt(sbi->s_mount_opt, NOBH);
1285 break;
1286 case Opt_extents:
1287 set_opt (sbi->s_mount_opt, EXTENTS);
1288 break;
1289 case Opt_noextents:
1290 clear_opt (sbi->s_mount_opt, EXTENTS);
1291 break;
1292 case Opt_i_version:
1293 set_opt(sbi->s_mount_opt, I_VERSION);
1294 sb->s_flags |= MS_I_VERSION;
1295 break;
1296 case Opt_mballoc:
1297 set_opt(sbi->s_mount_opt, MBALLOC);
1298 break;
1299 case Opt_nomballoc:
1300 clear_opt(sbi->s_mount_opt, MBALLOC);
1301 break;
1302 case Opt_stripe:
1303 if (match_int(&args[0], &option))
1304 return 0;
1305 if (option < 0)
1306 return 0;
1307 sbi->s_stripe = option;
1308 break;
1309 default:
1310 printk (KERN_ERR
1311 "EXT4-fs: Unrecognized mount option \"%s\" "
1312 "or missing value\n", p);
1313 return 0;
1314 }
1315 }
1316 #ifdef CONFIG_QUOTA
1317 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1318 if ((sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA) &&
1319 sbi->s_qf_names[USRQUOTA])
1320 clear_opt(sbi->s_mount_opt, USRQUOTA);
1321
1322 if ((sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA) &&
1323 sbi->s_qf_names[GRPQUOTA])
1324 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1325
1326 if ((sbi->s_qf_names[USRQUOTA] &&
1327 (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)) ||
1328 (sbi->s_qf_names[GRPQUOTA] &&
1329 (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA))) {
1330 printk(KERN_ERR "EXT4-fs: old and new quota "
1331 "format mixing.\n");
1332 return 0;
1333 }
1334
1335 if (!sbi->s_jquota_fmt) {
1336 printk(KERN_ERR "EXT4-fs: journalled quota format "
1337 "not specified.\n");
1338 return 0;
1339 }
1340 } else {
1341 if (sbi->s_jquota_fmt) {
1342 printk(KERN_ERR "EXT4-fs: journalled quota format "
1343 "specified with no journalling "
1344 "enabled.\n");
1345 return 0;
1346 }
1347 }
1348 #endif
1349 return 1;
1350 }
1351
1352 static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
1353 int read_only)
1354 {
1355 struct ext4_sb_info *sbi = EXT4_SB(sb);
1356 int res = 0;
1357
1358 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
1359 printk (KERN_ERR "EXT4-fs warning: revision level too high, "
1360 "forcing read-only mode\n");
1361 res = MS_RDONLY;
1362 }
1363 if (read_only)
1364 return res;
1365 if (!(sbi->s_mount_state & EXT4_VALID_FS))
1366 printk (KERN_WARNING "EXT4-fs warning: mounting unchecked fs, "
1367 "running e2fsck is recommended\n");
1368 else if ((sbi->s_mount_state & EXT4_ERROR_FS))
1369 printk (KERN_WARNING
1370 "EXT4-fs warning: mounting fs with errors, "
1371 "running e2fsck is recommended\n");
1372 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
1373 le16_to_cpu(es->s_mnt_count) >=
1374 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
1375 printk (KERN_WARNING
1376 "EXT4-fs warning: maximal mount count reached, "
1377 "running e2fsck is recommended\n");
1378 else if (le32_to_cpu(es->s_checkinterval) &&
1379 (le32_to_cpu(es->s_lastcheck) +
1380 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1381 printk (KERN_WARNING
1382 "EXT4-fs warning: checktime reached, "
1383 "running e2fsck is recommended\n");
1384 #if 0
1385 /* @@@ We _will_ want to clear the valid bit if we find
1386 * inconsistencies, to force a fsck at reboot. But for
1387 * a plain journaled filesystem we can keep it set as
1388 * valid forever! :)
1389 */
1390 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
1391 #endif
1392 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
1393 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
1394 le16_add_cpu(&es->s_mnt_count, 1);
1395 es->s_mtime = cpu_to_le32(get_seconds());
1396 ext4_update_dynamic_rev(sb);
1397 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
1398
1399 ext4_commit_super(sb, es, 1);
1400 if (test_opt(sb, DEBUG))
1401 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%lu, "
1402 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
1403 sb->s_blocksize,
1404 sbi->s_groups_count,
1405 EXT4_BLOCKS_PER_GROUP(sb),
1406 EXT4_INODES_PER_GROUP(sb),
1407 sbi->s_mount_opt);
1408
1409 printk(KERN_INFO "EXT4 FS on %s, ", sb->s_id);
1410 if (EXT4_SB(sb)->s_journal->j_inode == NULL) {
1411 char b[BDEVNAME_SIZE];
1412
1413 printk("external journal on %s\n",
1414 bdevname(EXT4_SB(sb)->s_journal->j_dev, b));
1415 } else {
1416 printk("internal journal\n");
1417 }
1418 return res;
1419 }
1420
1421 __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
1422 struct ext4_group_desc *gdp)
1423 {
1424 __u16 crc = 0;
1425
1426 if (sbi->s_es->s_feature_ro_compat &
1427 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) {
1428 int offset = offsetof(struct ext4_group_desc, bg_checksum);
1429 __le32 le_group = cpu_to_le32(block_group);
1430
1431 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
1432 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
1433 crc = crc16(crc, (__u8 *)gdp, offset);
1434 offset += sizeof(gdp->bg_checksum); /* skip checksum */
1435 /* for checksum of struct ext4_group_desc do the rest...*/
1436 if ((sbi->s_es->s_feature_incompat &
1437 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) &&
1438 offset < le16_to_cpu(sbi->s_es->s_desc_size))
1439 crc = crc16(crc, (__u8 *)gdp + offset,
1440 le16_to_cpu(sbi->s_es->s_desc_size) -
1441 offset);
1442 }
1443
1444 return cpu_to_le16(crc);
1445 }
1446
1447 int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 block_group,
1448 struct ext4_group_desc *gdp)
1449 {
1450 if ((sbi->s_es->s_feature_ro_compat &
1451 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) &&
1452 (gdp->bg_checksum != ext4_group_desc_csum(sbi, block_group, gdp)))
1453 return 0;
1454
1455 return 1;
1456 }
1457
1458 /* Called at mount-time, super-block is locked */
1459 static int ext4_check_descriptors(struct super_block *sb)
1460 {
1461 struct ext4_sb_info *sbi = EXT4_SB(sb);
1462 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
1463 ext4_fsblk_t last_block;
1464 ext4_fsblk_t block_bitmap;
1465 ext4_fsblk_t inode_bitmap;
1466 ext4_fsblk_t inode_table;
1467 int flexbg_flag = 0;
1468 ext4_group_t i;
1469
1470 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
1471 flexbg_flag = 1;
1472
1473 ext4_debug ("Checking group descriptors");
1474
1475 for (i = 0; i < sbi->s_groups_count; i++) {
1476 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
1477
1478 if (i == sbi->s_groups_count - 1 || flexbg_flag)
1479 last_block = ext4_blocks_count(sbi->s_es) - 1;
1480 else
1481 last_block = first_block +
1482 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
1483
1484 block_bitmap = ext4_block_bitmap(sb, gdp);
1485 if (block_bitmap < first_block || block_bitmap > last_block)
1486 {
1487 ext4_error (sb, "ext4_check_descriptors",
1488 "Block bitmap for group %lu"
1489 " not in group (block %llu)!",
1490 i, block_bitmap);
1491 return 0;
1492 }
1493 inode_bitmap = ext4_inode_bitmap(sb, gdp);
1494 if (inode_bitmap < first_block || inode_bitmap > last_block)
1495 {
1496 ext4_error (sb, "ext4_check_descriptors",
1497 "Inode bitmap for group %lu"
1498 " not in group (block %llu)!",
1499 i, inode_bitmap);
1500 return 0;
1501 }
1502 inode_table = ext4_inode_table(sb, gdp);
1503 if (inode_table < first_block ||
1504 inode_table + sbi->s_itb_per_group - 1 > last_block)
1505 {
1506 ext4_error (sb, "ext4_check_descriptors",
1507 "Inode table for group %lu"
1508 " not in group (block %llu)!",
1509 i, inode_table);
1510 return 0;
1511 }
1512 if (!ext4_group_desc_csum_verify(sbi, i, gdp)) {
1513 ext4_error(sb, __func__,
1514 "Checksum for group %lu failed (%u!=%u)\n",
1515 i, le16_to_cpu(ext4_group_desc_csum(sbi, i,
1516 gdp)), le16_to_cpu(gdp->bg_checksum));
1517 return 0;
1518 }
1519 if (!flexbg_flag)
1520 first_block += EXT4_BLOCKS_PER_GROUP(sb);
1521 }
1522
1523 ext4_free_blocks_count_set(sbi->s_es, ext4_count_free_blocks(sb));
1524 sbi->s_es->s_free_inodes_count=cpu_to_le32(ext4_count_free_inodes(sb));
1525 return 1;
1526 }
1527
1528 /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
1529 * the superblock) which were deleted from all directories, but held open by
1530 * a process at the time of a crash. We walk the list and try to delete these
1531 * inodes at recovery time (only with a read-write filesystem).
1532 *
1533 * In order to keep the orphan inode chain consistent during traversal (in
1534 * case of crash during recovery), we link each inode into the superblock
1535 * orphan list_head and handle it the same way as an inode deletion during
1536 * normal operation (which journals the operations for us).
1537 *
1538 * We only do an iget() and an iput() on each inode, which is very safe if we
1539 * accidentally point at an in-use or already deleted inode. The worst that
1540 * can happen in this case is that we get a "bit already cleared" message from
1541 * ext4_free_inode(). The only reason we would point at a wrong inode is if
1542 * e2fsck was run on this filesystem, and it must have already done the orphan
1543 * inode cleanup for us, so we can safely abort without any further action.
1544 */
1545 static void ext4_orphan_cleanup (struct super_block * sb,
1546 struct ext4_super_block * es)
1547 {
1548 unsigned int s_flags = sb->s_flags;
1549 int nr_orphans = 0, nr_truncates = 0;
1550 #ifdef CONFIG_QUOTA
1551 int i;
1552 #endif
1553 if (!es->s_last_orphan) {
1554 jbd_debug(4, "no orphan inodes to clean up\n");
1555 return;
1556 }
1557
1558 if (bdev_read_only(sb->s_bdev)) {
1559 printk(KERN_ERR "EXT4-fs: write access "
1560 "unavailable, skipping orphan cleanup.\n");
1561 return;
1562 }
1563
1564 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
1565 if (es->s_last_orphan)
1566 jbd_debug(1, "Errors on filesystem, "
1567 "clearing orphan list.\n");
1568 es->s_last_orphan = 0;
1569 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1570 return;
1571 }
1572
1573 if (s_flags & MS_RDONLY) {
1574 printk(KERN_INFO "EXT4-fs: %s: orphan cleanup on readonly fs\n",
1575 sb->s_id);
1576 sb->s_flags &= ~MS_RDONLY;
1577 }
1578 #ifdef CONFIG_QUOTA
1579 /* Needed for iput() to work correctly and not trash data */
1580 sb->s_flags |= MS_ACTIVE;
1581 /* Turn on quotas so that they are updated correctly */
1582 for (i = 0; i < MAXQUOTAS; i++) {
1583 if (EXT4_SB(sb)->s_qf_names[i]) {
1584 int ret = ext4_quota_on_mount(sb, i);
1585 if (ret < 0)
1586 printk(KERN_ERR
1587 "EXT4-fs: Cannot turn on journalled "
1588 "quota: error %d\n", ret);
1589 }
1590 }
1591 #endif
1592
1593 while (es->s_last_orphan) {
1594 struct inode *inode;
1595
1596 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
1597 if (IS_ERR(inode)) {
1598 es->s_last_orphan = 0;
1599 break;
1600 }
1601
1602 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
1603 DQUOT_INIT(inode);
1604 if (inode->i_nlink) {
1605 printk(KERN_DEBUG
1606 "%s: truncating inode %lu to %Ld bytes\n",
1607 __func__, inode->i_ino, inode->i_size);
1608 jbd_debug(2, "truncating inode %lu to %Ld bytes\n",
1609 inode->i_ino, inode->i_size);
1610 ext4_truncate(inode);
1611 nr_truncates++;
1612 } else {
1613 printk(KERN_DEBUG
1614 "%s: deleting unreferenced inode %lu\n",
1615 __func__, inode->i_ino);
1616 jbd_debug(2, "deleting unreferenced inode %lu\n",
1617 inode->i_ino);
1618 nr_orphans++;
1619 }
1620 iput(inode); /* The delete magic happens here! */
1621 }
1622
1623 #define PLURAL(x) (x), ((x)==1) ? "" : "s"
1624
1625 if (nr_orphans)
1626 printk(KERN_INFO "EXT4-fs: %s: %d orphan inode%s deleted\n",
1627 sb->s_id, PLURAL(nr_orphans));
1628 if (nr_truncates)
1629 printk(KERN_INFO "EXT4-fs: %s: %d truncate%s cleaned up\n",
1630 sb->s_id, PLURAL(nr_truncates));
1631 #ifdef CONFIG_QUOTA
1632 /* Turn quotas off */
1633 for (i = 0; i < MAXQUOTAS; i++) {
1634 if (sb_dqopt(sb)->files[i])
1635 vfs_quota_off(sb, i, 0);
1636 }
1637 #endif
1638 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1639 }
1640 /*
1641 * Maximal extent format file size.
1642 * Resulting logical blkno at s_maxbytes must fit in our on-disk
1643 * extent format containers, within a sector_t, and within i_blocks
1644 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
1645 * so that won't be a limiting factor.
1646 *
1647 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
1648 */
1649 static loff_t ext4_max_size(int blkbits)
1650 {
1651 loff_t res;
1652 loff_t upper_limit = MAX_LFS_FILESIZE;
1653
1654 /* small i_blocks in vfs inode? */
1655 if (sizeof(blkcnt_t) < sizeof(u64)) {
1656 /*
1657 * CONFIG_LSF is not enabled implies the inode
1658 * i_block represent total blocks in 512 bytes
1659 * 32 == size of vfs inode i_blocks * 8
1660 */
1661 upper_limit = (1LL << 32) - 1;
1662
1663 /* total blocks in file system block size */
1664 upper_limit >>= (blkbits - 9);
1665 upper_limit <<= blkbits;
1666 }
1667
1668 /* 32-bit extent-start container, ee_block */
1669 res = 1LL << 32;
1670 res <<= blkbits;
1671 res -= 1;
1672
1673 /* Sanity check against vm- & vfs- imposed limits */
1674 if (res > upper_limit)
1675 res = upper_limit;
1676
1677 return res;
1678 }
1679
1680 /*
1681 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
1682 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
1683 * We need to be 1 filesystem block less than the 2^48 sector limit.
1684 */
1685 static loff_t ext4_max_bitmap_size(int bits)
1686 {
1687 loff_t res = EXT4_NDIR_BLOCKS;
1688 int meta_blocks;
1689 loff_t upper_limit;
1690 /* This is calculated to be the largest file size for a
1691 * dense, bitmapped file such that the total number of
1692 * sectors in the file, including data and all indirect blocks,
1693 * does not exceed 2^48 -1
1694 * __u32 i_blocks_lo and _u16 i_blocks_high representing the
1695 * total number of 512 bytes blocks of the file
1696 */
1697
1698 if (sizeof(blkcnt_t) < sizeof(u64)) {
1699 /*
1700 * CONFIG_LSF is not enabled implies the inode
1701 * i_block represent total blocks in 512 bytes
1702 * 32 == size of vfs inode i_blocks * 8
1703 */
1704 upper_limit = (1LL << 32) - 1;
1705
1706 /* total blocks in file system block size */
1707 upper_limit >>= (bits - 9);
1708
1709 } else {
1710 /*
1711 * We use 48 bit ext4_inode i_blocks
1712 * With EXT4_HUGE_FILE_FL set the i_blocks
1713 * represent total number of blocks in
1714 * file system block size
1715 */
1716 upper_limit = (1LL << 48) - 1;
1717
1718 }
1719
1720 /* indirect blocks */
1721 meta_blocks = 1;
1722 /* double indirect blocks */
1723 meta_blocks += 1 + (1LL << (bits-2));
1724 /* tripple indirect blocks */
1725 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
1726
1727 upper_limit -= meta_blocks;
1728 upper_limit <<= bits;
1729
1730 res += 1LL << (bits-2);
1731 res += 1LL << (2*(bits-2));
1732 res += 1LL << (3*(bits-2));
1733 res <<= bits;
1734 if (res > upper_limit)
1735 res = upper_limit;
1736
1737 if (res > MAX_LFS_FILESIZE)
1738 res = MAX_LFS_FILESIZE;
1739
1740 return res;
1741 }
1742
1743 static ext4_fsblk_t descriptor_loc(struct super_block *sb,
1744 ext4_fsblk_t logical_sb_block, int nr)
1745 {
1746 struct ext4_sb_info *sbi = EXT4_SB(sb);
1747 ext4_group_t bg, first_meta_bg;
1748 int has_super = 0;
1749
1750 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1751
1752 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
1753 nr < first_meta_bg)
1754 return logical_sb_block + nr + 1;
1755 bg = sbi->s_desc_per_block * nr;
1756 if (ext4_bg_has_super(sb, bg))
1757 has_super = 1;
1758 return (has_super + ext4_group_first_block_no(sb, bg));
1759 }
1760
1761 /**
1762 * ext4_get_stripe_size: Get the stripe size.
1763 * @sbi: In memory super block info
1764 *
1765 * If we have specified it via mount option, then
1766 * use the mount option value. If the value specified at mount time is
1767 * greater than the blocks per group use the super block value.
1768 * If the super block value is greater than blocks per group return 0.
1769 * Allocator needs it be less than blocks per group.
1770 *
1771 */
1772 static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
1773 {
1774 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
1775 unsigned long stripe_width =
1776 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
1777
1778 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
1779 return sbi->s_stripe;
1780
1781 if (stripe_width <= sbi->s_blocks_per_group)
1782 return stripe_width;
1783
1784 if (stride <= sbi->s_blocks_per_group)
1785 return stride;
1786
1787 return 0;
1788 }
1789
1790 static int ext4_fill_super (struct super_block *sb, void *data, int silent)
1791 __releases(kernel_sem)
1792 __acquires(kernel_sem)
1793
1794 {
1795 struct buffer_head * bh;
1796 struct ext4_super_block *es = NULL;
1797 struct ext4_sb_info *sbi;
1798 ext4_fsblk_t block;
1799 ext4_fsblk_t sb_block = get_sb_block(&data);
1800 ext4_fsblk_t logical_sb_block;
1801 unsigned long offset = 0;
1802 unsigned int journal_inum = 0;
1803 unsigned long journal_devnum = 0;
1804 unsigned long def_mount_opts;
1805 struct inode *root;
1806 int ret = -EINVAL;
1807 int blocksize;
1808 int db_count;
1809 int i;
1810 int needs_recovery;
1811 __le32 features;
1812 __u64 blocks_count;
1813 int err;
1814
1815 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
1816 if (!sbi)
1817 return -ENOMEM;
1818 sb->s_fs_info = sbi;
1819 sbi->s_mount_opt = 0;
1820 sbi->s_resuid = EXT4_DEF_RESUID;
1821 sbi->s_resgid = EXT4_DEF_RESGID;
1822 sbi->s_sb_block = sb_block;
1823
1824 unlock_kernel();
1825
1826 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
1827 if (!blocksize) {
1828 printk(KERN_ERR "EXT4-fs: unable to set blocksize\n");
1829 goto out_fail;
1830 }
1831
1832 if (!sb_set_blocksize(sb, blocksize)) {
1833 printk(KERN_ERR "EXT4-fs: bad blocksize %d.\n", blocksize);
1834 goto out_fail;
1835 }
1836
1837 /*
1838 * The ext4 superblock will not be buffer aligned for other than 1kB
1839 * block sizes. We need to calculate the offset from buffer start.
1840 */
1841 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
1842 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
1843 offset = do_div(logical_sb_block, blocksize);
1844 } else {
1845 logical_sb_block = sb_block;
1846 }
1847
1848 if (!(bh = sb_bread(sb, logical_sb_block))) {
1849 printk (KERN_ERR "EXT4-fs: unable to read superblock\n");
1850 goto out_fail;
1851 }
1852 /*
1853 * Note: s_es must be initialized as soon as possible because
1854 * some ext4 macro-instructions depend on its value
1855 */
1856 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
1857 sbi->s_es = es;
1858 sb->s_magic = le16_to_cpu(es->s_magic);
1859 if (sb->s_magic != EXT4_SUPER_MAGIC)
1860 goto cantfind_ext4;
1861
1862 /* Set defaults before we parse the mount options */
1863 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
1864 if (def_mount_opts & EXT4_DEFM_DEBUG)
1865 set_opt(sbi->s_mount_opt, DEBUG);
1866 if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
1867 set_opt(sbi->s_mount_opt, GRPID);
1868 if (def_mount_opts & EXT4_DEFM_UID16)
1869 set_opt(sbi->s_mount_opt, NO_UID32);
1870 #ifdef CONFIG_EXT4DEV_FS_XATTR
1871 if (def_mount_opts & EXT4_DEFM_XATTR_USER)
1872 set_opt(sbi->s_mount_opt, XATTR_USER);
1873 #endif
1874 #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
1875 if (def_mount_opts & EXT4_DEFM_ACL)
1876 set_opt(sbi->s_mount_opt, POSIX_ACL);
1877 #endif
1878 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
1879 sbi->s_mount_opt |= EXT4_MOUNT_JOURNAL_DATA;
1880 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
1881 sbi->s_mount_opt |= EXT4_MOUNT_ORDERED_DATA;
1882 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
1883 sbi->s_mount_opt |= EXT4_MOUNT_WRITEBACK_DATA;
1884
1885 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
1886 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1887 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
1888 set_opt(sbi->s_mount_opt, ERRORS_CONT);
1889 else
1890 set_opt(sbi->s_mount_opt, ERRORS_RO);
1891
1892 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
1893 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
1894
1895 set_opt(sbi->s_mount_opt, RESERVATION);
1896
1897 /*
1898 * turn on extents feature by default in ext4 filesystem
1899 * User -o noextents to turn it off
1900 */
1901 set_opt(sbi->s_mount_opt, EXTENTS);
1902 /*
1903 * turn on mballoc feature by default in ext4 filesystem
1904 * User -o nomballoc to turn it off
1905 */
1906 set_opt(sbi->s_mount_opt, MBALLOC);
1907
1908 if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
1909 NULL, 0))
1910 goto failed_mount;
1911
1912 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1913 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
1914
1915 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
1916 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
1917 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
1918 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
1919 printk(KERN_WARNING
1920 "EXT4-fs warning: feature flags set on rev 0 fs, "
1921 "running e2fsck is recommended\n");
1922
1923 /*
1924 * Since ext4 is still considered development code, we require
1925 * that the TEST_FILESYS flag in s->flags be set.
1926 */
1927 if (!(le32_to_cpu(es->s_flags) & EXT2_FLAGS_TEST_FILESYS)) {
1928 printk(KERN_WARNING "EXT4-fs: %s: not marked "
1929 "OK to use with test code.\n", sb->s_id);
1930 goto failed_mount;
1931 }
1932
1933 /*
1934 * Check feature flags regardless of the revision level, since we
1935 * previously didn't change the revision level when setting the flags,
1936 * so there is a chance incompat flags are set on a rev 0 filesystem.
1937 */
1938 features = EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP);
1939 if (features) {
1940 printk(KERN_ERR "EXT4-fs: %s: couldn't mount because of "
1941 "unsupported optional features (%x).\n",
1942 sb->s_id, le32_to_cpu(features));
1943 goto failed_mount;
1944 }
1945 features = EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP);
1946 if (!(sb->s_flags & MS_RDONLY) && features) {
1947 printk(KERN_ERR "EXT4-fs: %s: couldn't mount RDWR because of "
1948 "unsupported optional features (%x).\n",
1949 sb->s_id, le32_to_cpu(features));
1950 goto failed_mount;
1951 }
1952 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) {
1953 /*
1954 * Large file size enabled file system can only be
1955 * mount if kernel is build with CONFIG_LSF
1956 */
1957 if (sizeof(root->i_blocks) < sizeof(u64) &&
1958 !(sb->s_flags & MS_RDONLY)) {
1959 printk(KERN_ERR "EXT4-fs: %s: Filesystem with huge "
1960 "files cannot be mounted read-write "
1961 "without CONFIG_LSF.\n", sb->s_id);
1962 goto failed_mount;
1963 }
1964 }
1965 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
1966
1967 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
1968 blocksize > EXT4_MAX_BLOCK_SIZE) {
1969 printk(KERN_ERR
1970 "EXT4-fs: Unsupported filesystem blocksize %d on %s.\n",
1971 blocksize, sb->s_id);
1972 goto failed_mount;
1973 }
1974
1975 if (sb->s_blocksize != blocksize) {
1976
1977 /* Validate the filesystem blocksize */
1978 if (!sb_set_blocksize(sb, blocksize)) {
1979 printk(KERN_ERR "EXT4-fs: bad block size %d.\n",
1980 blocksize);
1981 goto failed_mount;
1982 }
1983
1984 brelse (bh);
1985 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
1986 offset = do_div(logical_sb_block, blocksize);
1987 bh = sb_bread(sb, logical_sb_block);
1988 if (!bh) {
1989 printk(KERN_ERR
1990 "EXT4-fs: Can't read superblock on 2nd try.\n");
1991 goto failed_mount;
1992 }
1993 es = (struct ext4_super_block *)(((char *)bh->b_data) + offset);
1994 sbi->s_es = es;
1995 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
1996 printk (KERN_ERR
1997 "EXT4-fs: Magic mismatch, very weird !\n");
1998 goto failed_mount;
1999 }
2000 }
2001
2002 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits);
2003 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits);
2004
2005 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
2006 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
2007 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
2008 } else {
2009 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
2010 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
2011 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
2012 (!is_power_of_2(sbi->s_inode_size)) ||
2013 (sbi->s_inode_size > blocksize)) {
2014 printk (KERN_ERR
2015 "EXT4-fs: unsupported inode size: %d\n",
2016 sbi->s_inode_size);
2017 goto failed_mount;
2018 }
2019 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
2020 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
2021 }
2022 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
2023 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
2024 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
2025 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
2026 !is_power_of_2(sbi->s_desc_size)) {
2027 printk(KERN_ERR
2028 "EXT4-fs: unsupported descriptor size %lu\n",
2029 sbi->s_desc_size);
2030 goto failed_mount;
2031 }
2032 } else
2033 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
2034 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
2035 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
2036 if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
2037 goto cantfind_ext4;
2038 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
2039 if (sbi->s_inodes_per_block == 0)
2040 goto cantfind_ext4;
2041 sbi->s_itb_per_group = sbi->s_inodes_per_group /
2042 sbi->s_inodes_per_block;
2043 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
2044 sbi->s_sbh = bh;
2045 sbi->s_mount_state = le16_to_cpu(es->s_state);
2046 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
2047 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
2048 for (i=0; i < 4; i++)
2049 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
2050 sbi->s_def_hash_version = es->s_def_hash_version;
2051
2052 if (sbi->s_blocks_per_group > blocksize * 8) {
2053 printk (KERN_ERR
2054 "EXT4-fs: #blocks per group too big: %lu\n",
2055 sbi->s_blocks_per_group);
2056 goto failed_mount;
2057 }
2058 if (sbi->s_inodes_per_group > blocksize * 8) {
2059 printk (KERN_ERR
2060 "EXT4-fs: #inodes per group too big: %lu\n",
2061 sbi->s_inodes_per_group);
2062 goto failed_mount;
2063 }
2064
2065 if (ext4_blocks_count(es) >
2066 (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) {
2067 printk(KERN_ERR "EXT4-fs: filesystem on %s:"
2068 " too large to mount safely\n", sb->s_id);
2069 if (sizeof(sector_t) < 8)
2070 printk(KERN_WARNING "EXT4-fs: CONFIG_LBD not "
2071 "enabled\n");
2072 goto failed_mount;
2073 }
2074
2075 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
2076 goto cantfind_ext4;
2077
2078 /* ensure blocks_count calculation below doesn't sign-extend */
2079 if (ext4_blocks_count(es) + EXT4_BLOCKS_PER_GROUP(sb) <
2080 le32_to_cpu(es->s_first_data_block) + 1) {
2081 printk(KERN_WARNING "EXT4-fs: bad geometry: block count %llu, "
2082 "first data block %u, blocks per group %lu\n",
2083 ext4_blocks_count(es),
2084 le32_to_cpu(es->s_first_data_block),
2085 EXT4_BLOCKS_PER_GROUP(sb));
2086 goto failed_mount;
2087 }
2088 blocks_count = (ext4_blocks_count(es) -
2089 le32_to_cpu(es->s_first_data_block) +
2090 EXT4_BLOCKS_PER_GROUP(sb) - 1);
2091 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
2092 sbi->s_groups_count = blocks_count;
2093 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
2094 EXT4_DESC_PER_BLOCK(sb);
2095 sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
2096 GFP_KERNEL);
2097 if (sbi->s_group_desc == NULL) {
2098 printk (KERN_ERR "EXT4-fs: not enough memory\n");
2099 goto failed_mount;
2100 }
2101
2102 bgl_lock_init(&sbi->s_blockgroup_lock);
2103
2104 for (i = 0; i < db_count; i++) {
2105 block = descriptor_loc(sb, logical_sb_block, i);
2106 sbi->s_group_desc[i] = sb_bread(sb, block);
2107 if (!sbi->s_group_desc[i]) {
2108 printk (KERN_ERR "EXT4-fs: "
2109 "can't read group descriptor %d\n", i);
2110 db_count = i;
2111 goto failed_mount2;
2112 }
2113 }
2114 if (!ext4_check_descriptors (sb)) {
2115 printk(KERN_ERR "EXT4-fs: group descriptors corrupted!\n");
2116 goto failed_mount2;
2117 }
2118 sbi->s_gdb_count = db_count;
2119 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
2120 spin_lock_init(&sbi->s_next_gen_lock);
2121
2122 err = percpu_counter_init(&sbi->s_freeblocks_counter,
2123 ext4_count_free_blocks(sb));
2124 if (!err) {
2125 err = percpu_counter_init(&sbi->s_freeinodes_counter,
2126 ext4_count_free_inodes(sb));
2127 }
2128 if (!err) {
2129 err = percpu_counter_init(&sbi->s_dirs_counter,
2130 ext4_count_dirs(sb));
2131 }
2132 if (err) {
2133 printk(KERN_ERR "EXT4-fs: insufficient memory\n");
2134 goto failed_mount3;
2135 }
2136
2137 /* per fileystem reservation list head & lock */
2138 spin_lock_init(&sbi->s_rsv_window_lock);
2139 sbi->s_rsv_window_root = RB_ROOT;
2140 /* Add a single, static dummy reservation to the start of the
2141 * reservation window list --- it gives us a placeholder for
2142 * append-at-start-of-list which makes the allocation logic
2143 * _much_ simpler. */
2144 sbi->s_rsv_window_head.rsv_start = EXT4_RESERVE_WINDOW_NOT_ALLOCATED;
2145 sbi->s_rsv_window_head.rsv_end = EXT4_RESERVE_WINDOW_NOT_ALLOCATED;
2146 sbi->s_rsv_window_head.rsv_alloc_hit = 0;
2147 sbi->s_rsv_window_head.rsv_goal_size = 0;
2148 ext4_rsv_window_add(sb, &sbi->s_rsv_window_head);
2149
2150 sbi->s_stripe = ext4_get_stripe_size(sbi);
2151
2152 /*
2153 * set up enough so that it can read an inode
2154 */
2155 sb->s_op = &ext4_sops;
2156 sb->s_export_op = &ext4_export_ops;
2157 sb->s_xattr = ext4_xattr_handlers;
2158 #ifdef CONFIG_QUOTA
2159 sb->s_qcop = &ext4_qctl_operations;
2160 sb->dq_op = &ext4_quota_operations;
2161 #endif
2162 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
2163
2164 sb->s_root = NULL;
2165
2166 needs_recovery = (es->s_last_orphan != 0 ||
2167 EXT4_HAS_INCOMPAT_FEATURE(sb,
2168 EXT4_FEATURE_INCOMPAT_RECOVER));
2169
2170 /*
2171 * The first inode we look at is the journal inode. Don't try
2172 * root first: it may be modified in the journal!
2173 */
2174 if (!test_opt(sb, NOLOAD) &&
2175 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
2176 if (ext4_load_journal(sb, es, journal_devnum))
2177 goto failed_mount3;
2178 } else if (journal_inum) {
2179 if (ext4_create_journal(sb, es, journal_inum))
2180 goto failed_mount3;
2181 } else {
2182 if (!silent)
2183 printk (KERN_ERR
2184 "ext4: No journal on filesystem on %s\n",
2185 sb->s_id);
2186 goto failed_mount3;
2187 }
2188
2189 if (ext4_blocks_count(es) > 0xffffffffULL &&
2190 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
2191 JBD2_FEATURE_INCOMPAT_64BIT)) {
2192 printk(KERN_ERR "ext4: Failed to set 64-bit journal feature\n");
2193 goto failed_mount4;
2194 }
2195
2196 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
2197 jbd2_journal_set_features(sbi->s_journal,
2198 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
2199 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2200 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
2201 jbd2_journal_set_features(sbi->s_journal,
2202 JBD2_FEATURE_COMPAT_CHECKSUM, 0, 0);
2203 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
2204 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2205 } else {
2206 jbd2_journal_clear_features(sbi->s_journal,
2207 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
2208 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2209 }
2210
2211 /* We have now updated the journal if required, so we can
2212 * validate the data journaling mode. */
2213 switch (test_opt(sb, DATA_FLAGS)) {
2214 case 0:
2215 /* No mode set, assume a default based on the journal
2216 * capabilities: ORDERED_DATA if the journal can
2217 * cope, else JOURNAL_DATA
2218 */
2219 if (jbd2_journal_check_available_features
2220 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
2221 set_opt(sbi->s_mount_opt, ORDERED_DATA);
2222 else
2223 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
2224 break;
2225
2226 case EXT4_MOUNT_ORDERED_DATA:
2227 case EXT4_MOUNT_WRITEBACK_DATA:
2228 if (!jbd2_journal_check_available_features
2229 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
2230 printk(KERN_ERR "EXT4-fs: Journal does not support "
2231 "requested data journaling mode\n");
2232 goto failed_mount4;
2233 }
2234 default:
2235 break;
2236 }
2237
2238 if (test_opt(sb, NOBH)) {
2239 if (!(test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)) {
2240 printk(KERN_WARNING "EXT4-fs: Ignoring nobh option - "
2241 "its supported only with writeback mode\n");
2242 clear_opt(sbi->s_mount_opt, NOBH);
2243 }
2244 }
2245 /*
2246 * The jbd2_journal_load will have done any necessary log recovery,
2247 * so we can safely mount the rest of the filesystem now.
2248 */
2249
2250 root = ext4_iget(sb, EXT4_ROOT_INO);
2251 if (IS_ERR(root)) {
2252 printk(KERN_ERR "EXT4-fs: get root inode failed\n");
2253 ret = PTR_ERR(root);
2254 goto failed_mount4;
2255 }
2256 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
2257 iput(root);
2258 printk(KERN_ERR "EXT4-fs: corrupt root inode, run e2fsck\n");
2259 goto failed_mount4;
2260 }
2261 sb->s_root = d_alloc_root(root);
2262 if (!sb->s_root) {
2263 printk(KERN_ERR "EXT4-fs: get root dentry failed\n");
2264 iput(root);
2265 ret = -ENOMEM;
2266 goto failed_mount4;
2267 }
2268
2269 ext4_setup_super (sb, es, sb->s_flags & MS_RDONLY);
2270
2271 /* determine the minimum size of new large inodes, if present */
2272 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
2273 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
2274 EXT4_GOOD_OLD_INODE_SIZE;
2275 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
2276 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) {
2277 if (sbi->s_want_extra_isize <
2278 le16_to_cpu(es->s_want_extra_isize))
2279 sbi->s_want_extra_isize =
2280 le16_to_cpu(es->s_want_extra_isize);
2281 if (sbi->s_want_extra_isize <
2282 le16_to_cpu(es->s_min_extra_isize))
2283 sbi->s_want_extra_isize =
2284 le16_to_cpu(es->s_min_extra_isize);
2285 }
2286 }
2287 /* Check if enough inode space is available */
2288 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
2289 sbi->s_inode_size) {
2290 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
2291 EXT4_GOOD_OLD_INODE_SIZE;
2292 printk(KERN_INFO "EXT4-fs: required extra inode space not"
2293 "available.\n");
2294 }
2295
2296 /*
2297 * akpm: core read_super() calls in here with the superblock locked.
2298 * That deadlocks, because orphan cleanup needs to lock the superblock
2299 * in numerous places. Here we just pop the lock - it's relatively
2300 * harmless, because we are now ready to accept write_super() requests,
2301 * and aviro says that's the only reason for hanging onto the
2302 * superblock lock.
2303 */
2304 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
2305 ext4_orphan_cleanup(sb, es);
2306 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
2307 if (needs_recovery)
2308 printk (KERN_INFO "EXT4-fs: recovery complete.\n");
2309 ext4_mark_recovery_complete(sb, es);
2310 printk (KERN_INFO "EXT4-fs: mounted filesystem with %s data mode.\n",
2311 test_opt(sb,DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA ? "journal":
2312 test_opt(sb,DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA ? "ordered":
2313 "writeback");
2314
2315 ext4_ext_init(sb);
2316 ext4_mb_init(sb, needs_recovery);
2317
2318 lock_kernel();
2319 return 0;
2320
2321 cantfind_ext4:
2322 if (!silent)
2323 printk(KERN_ERR "VFS: Can't find ext4 filesystem on dev %s.\n",
2324 sb->s_id);
2325 goto failed_mount;
2326
2327 failed_mount4:
2328 jbd2_journal_destroy(sbi->s_journal);
2329 failed_mount3:
2330 percpu_counter_destroy(&sbi->s_freeblocks_counter);
2331 percpu_counter_destroy(&sbi->s_freeinodes_counter);
2332 percpu_counter_destroy(&sbi->s_dirs_counter);
2333 failed_mount2:
2334 for (i = 0; i < db_count; i++)
2335 brelse(sbi->s_group_desc[i]);
2336 kfree(sbi->s_group_desc);
2337 failed_mount:
2338 #ifdef CONFIG_QUOTA
2339 for (i = 0; i < MAXQUOTAS; i++)
2340 kfree(sbi->s_qf_names[i]);
2341 #endif
2342 ext4_blkdev_remove(sbi);
2343 brelse(bh);
2344 out_fail:
2345 sb->s_fs_info = NULL;
2346 kfree(sbi);
2347 lock_kernel();
2348 return ret;
2349 }
2350
2351 /*
2352 * Setup any per-fs journal parameters now. We'll do this both on
2353 * initial mount, once the journal has been initialised but before we've
2354 * done any recovery; and again on any subsequent remount.
2355 */
2356 static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
2357 {
2358 struct ext4_sb_info *sbi = EXT4_SB(sb);
2359
2360 if (sbi->s_commit_interval)
2361 journal->j_commit_interval = sbi->s_commit_interval;
2362 /* We could also set up an ext4-specific default for the commit
2363 * interval here, but for now we'll just fall back to the jbd
2364 * default. */
2365
2366 spin_lock(&journal->j_state_lock);
2367 if (test_opt(sb, BARRIER))
2368 journal->j_flags |= JBD2_BARRIER;
2369 else
2370 journal->j_flags &= ~JBD2_BARRIER;
2371 spin_unlock(&journal->j_state_lock);
2372 }
2373
2374 static journal_t *ext4_get_journal(struct super_block *sb,
2375 unsigned int journal_inum)
2376 {
2377 struct inode *journal_inode;
2378 journal_t *journal;
2379
2380 /* First, test for the existence of a valid inode on disk. Bad
2381 * things happen if we iget() an unused inode, as the subsequent
2382 * iput() will try to delete it. */
2383
2384 journal_inode = ext4_iget(sb, journal_inum);
2385 if (IS_ERR(journal_inode)) {
2386 printk(KERN_ERR "EXT4-fs: no journal found.\n");
2387 return NULL;
2388 }
2389 if (!journal_inode->i_nlink) {
2390 make_bad_inode(journal_inode);
2391 iput(journal_inode);
2392 printk(KERN_ERR "EXT4-fs: journal inode is deleted.\n");
2393 return NULL;
2394 }
2395
2396 jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
2397 journal_inode, journal_inode->i_size);
2398 if (!S_ISREG(journal_inode->i_mode)) {
2399 printk(KERN_ERR "EXT4-fs: invalid journal inode.\n");
2400 iput(journal_inode);
2401 return NULL;
2402 }
2403
2404 journal = jbd2_journal_init_inode(journal_inode);
2405 if (!journal) {
2406 printk(KERN_ERR "EXT4-fs: Could not load journal inode\n");
2407 iput(journal_inode);
2408 return NULL;
2409 }
2410 journal->j_private = sb;
2411 ext4_init_journal_params(sb, journal);
2412 return journal;
2413 }
2414
2415 static journal_t *ext4_get_dev_journal(struct super_block *sb,
2416 dev_t j_dev)
2417 {
2418 struct buffer_head * bh;
2419 journal_t *journal;
2420 ext4_fsblk_t start;
2421 ext4_fsblk_t len;
2422 int hblock, blocksize;
2423 ext4_fsblk_t sb_block;
2424 unsigned long offset;
2425 struct ext4_super_block * es;
2426 struct block_device *bdev;
2427
2428 bdev = ext4_blkdev_get(j_dev);
2429 if (bdev == NULL)
2430 return NULL;
2431
2432 if (bd_claim(bdev, sb)) {
2433 printk(KERN_ERR
2434 "EXT4: failed to claim external journal device.\n");
2435 blkdev_put(bdev);
2436 return NULL;
2437 }
2438
2439 blocksize = sb->s_blocksize;
2440 hblock = bdev_hardsect_size(bdev);
2441 if (blocksize < hblock) {
2442 printk(KERN_ERR
2443 "EXT4-fs: blocksize too small for journal device.\n");
2444 goto out_bdev;
2445 }
2446
2447 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
2448 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
2449 set_blocksize(bdev, blocksize);
2450 if (!(bh = __bread(bdev, sb_block, blocksize))) {
2451 printk(KERN_ERR "EXT4-fs: couldn't read superblock of "
2452 "external journal\n");
2453 goto out_bdev;
2454 }
2455
2456 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
2457 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
2458 !(le32_to_cpu(es->s_feature_incompat) &
2459 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
2460 printk(KERN_ERR "EXT4-fs: external journal has "
2461 "bad superblock\n");
2462 brelse(bh);
2463 goto out_bdev;
2464 }
2465
2466 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
2467 printk(KERN_ERR "EXT4-fs: journal UUID does not match\n");
2468 brelse(bh);
2469 goto out_bdev;
2470 }
2471
2472 len = ext4_blocks_count(es);
2473 start = sb_block + 1;
2474 brelse(bh); /* we're done with the superblock */
2475
2476 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
2477 start, len, blocksize);
2478 if (!journal) {
2479 printk(KERN_ERR "EXT4-fs: failed to create device journal\n");
2480 goto out_bdev;
2481 }
2482 journal->j_private = sb;
2483 ll_rw_block(READ, 1, &journal->j_sb_buffer);
2484 wait_on_buffer(journal->j_sb_buffer);
2485 if (!buffer_uptodate(journal->j_sb_buffer)) {
2486 printk(KERN_ERR "EXT4-fs: I/O error on journal device\n");
2487 goto out_journal;
2488 }
2489 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
2490 printk(KERN_ERR "EXT4-fs: External journal has more than one "
2491 "user (unsupported) - %d\n",
2492 be32_to_cpu(journal->j_superblock->s_nr_users));
2493 goto out_journal;
2494 }
2495 EXT4_SB(sb)->journal_bdev = bdev;
2496 ext4_init_journal_params(sb, journal);
2497 return journal;
2498 out_journal:
2499 jbd2_journal_destroy(journal);
2500 out_bdev:
2501 ext4_blkdev_put(bdev);
2502 return NULL;
2503 }
2504
2505 static int ext4_load_journal(struct super_block *sb,
2506 struct ext4_super_block *es,
2507 unsigned long journal_devnum)
2508 {
2509 journal_t *journal;
2510 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
2511 dev_t journal_dev;
2512 int err = 0;
2513 int really_read_only;
2514
2515 if (journal_devnum &&
2516 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2517 printk(KERN_INFO "EXT4-fs: external journal device major/minor "
2518 "numbers have changed\n");
2519 journal_dev = new_decode_dev(journal_devnum);
2520 } else
2521 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
2522
2523 really_read_only = bdev_read_only(sb->s_bdev);
2524
2525 /*
2526 * Are we loading a blank journal or performing recovery after a
2527 * crash? For recovery, we need to check in advance whether we
2528 * can get read-write access to the device.
2529 */
2530
2531 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
2532 if (sb->s_flags & MS_RDONLY) {
2533 printk(KERN_INFO "EXT4-fs: INFO: recovery "
2534 "required on readonly filesystem.\n");
2535 if (really_read_only) {
2536 printk(KERN_ERR "EXT4-fs: write access "
2537 "unavailable, cannot proceed.\n");
2538 return -EROFS;
2539 }
2540 printk (KERN_INFO "EXT4-fs: write access will "
2541 "be enabled during recovery.\n");
2542 }
2543 }
2544
2545 if (journal_inum && journal_dev) {
2546 printk(KERN_ERR "EXT4-fs: filesystem has both journal "
2547 "and inode journals!\n");
2548 return -EINVAL;
2549 }
2550
2551 if (journal_inum) {
2552 if (!(journal = ext4_get_journal(sb, journal_inum)))
2553 return -EINVAL;
2554 } else {
2555 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
2556 return -EINVAL;
2557 }
2558
2559 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
2560 err = jbd2_journal_update_format(journal);
2561 if (err) {
2562 printk(KERN_ERR "EXT4-fs: error updating journal.\n");
2563 jbd2_journal_destroy(journal);
2564 return err;
2565 }
2566 }
2567
2568 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
2569 err = jbd2_journal_wipe(journal, !really_read_only);
2570 if (!err)
2571 err = jbd2_journal_load(journal);
2572
2573 if (err) {
2574 printk(KERN_ERR "EXT4-fs: error loading journal.\n");
2575 jbd2_journal_destroy(journal);
2576 return err;
2577 }
2578
2579 EXT4_SB(sb)->s_journal = journal;
2580 ext4_clear_journal_err(sb, es);
2581
2582 if (journal_devnum &&
2583 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2584 es->s_journal_dev = cpu_to_le32(journal_devnum);
2585 sb->s_dirt = 1;
2586
2587 /* Make sure we flush the recovery flag to disk. */
2588 ext4_commit_super(sb, es, 1);
2589 }
2590
2591 return 0;
2592 }
2593
2594 static int ext4_create_journal(struct super_block * sb,
2595 struct ext4_super_block * es,
2596 unsigned int journal_inum)
2597 {
2598 journal_t *journal;
2599 int err;
2600
2601 if (sb->s_flags & MS_RDONLY) {
2602 printk(KERN_ERR "EXT4-fs: readonly filesystem when trying to "
2603 "create journal.\n");
2604 return -EROFS;
2605 }
2606
2607 journal = ext4_get_journal(sb, journal_inum);
2608 if (!journal)
2609 return -EINVAL;
2610
2611 printk(KERN_INFO "EXT4-fs: creating new journal on inode %u\n",
2612 journal_inum);
2613
2614 err = jbd2_journal_create(journal);
2615 if (err) {
2616 printk(KERN_ERR "EXT4-fs: error creating journal.\n");
2617 jbd2_journal_destroy(journal);
2618 return -EIO;
2619 }
2620
2621 EXT4_SB(sb)->s_journal = journal;
2622
2623 ext4_update_dynamic_rev(sb);
2624 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2625 EXT4_SET_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL);
2626
2627 es->s_journal_inum = cpu_to_le32(journal_inum);
2628 sb->s_dirt = 1;
2629
2630 /* Make sure we flush the recovery flag to disk. */
2631 ext4_commit_super(sb, es, 1);
2632
2633 return 0;
2634 }
2635
2636 static void ext4_commit_super (struct super_block * sb,
2637 struct ext4_super_block * es,
2638 int sync)
2639 {
2640 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
2641
2642 if (!sbh)
2643 return;
2644 es->s_wtime = cpu_to_le32(get_seconds());
2645 ext4_free_blocks_count_set(es, ext4_count_free_blocks(sb));
2646 es->s_free_inodes_count = cpu_to_le32(ext4_count_free_inodes(sb));
2647 BUFFER_TRACE(sbh, "marking dirty");
2648 mark_buffer_dirty(sbh);
2649 if (sync)
2650 sync_dirty_buffer(sbh);
2651 }
2652
2653
2654 /*
2655 * Have we just finished recovery? If so, and if we are mounting (or
2656 * remounting) the filesystem readonly, then we will end up with a
2657 * consistent fs on disk. Record that fact.
2658 */
2659 static void ext4_mark_recovery_complete(struct super_block * sb,
2660 struct ext4_super_block * es)
2661 {
2662 journal_t *journal = EXT4_SB(sb)->s_journal;
2663
2664 jbd2_journal_lock_updates(journal);
2665 jbd2_journal_flush(journal);
2666 lock_super(sb);
2667 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
2668 sb->s_flags & MS_RDONLY) {
2669 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2670 sb->s_dirt = 0;
2671 ext4_commit_super(sb, es, 1);
2672 }
2673 unlock_super(sb);
2674 jbd2_journal_unlock_updates(journal);
2675 }
2676
2677 /*
2678 * If we are mounting (or read-write remounting) a filesystem whose journal
2679 * has recorded an error from a previous lifetime, move that error to the
2680 * main filesystem now.
2681 */
2682 static void ext4_clear_journal_err(struct super_block * sb,
2683 struct ext4_super_block * es)
2684 {
2685 journal_t *journal;
2686 int j_errno;
2687 const char *errstr;
2688
2689 journal = EXT4_SB(sb)->s_journal;
2690
2691 /*
2692 * Now check for any error status which may have been recorded in the
2693 * journal by a prior ext4_error() or ext4_abort()
2694 */
2695
2696 j_errno = jbd2_journal_errno(journal);
2697 if (j_errno) {
2698 char nbuf[16];
2699
2700 errstr = ext4_decode_error(sb, j_errno, nbuf);
2701 ext4_warning(sb, __func__, "Filesystem error recorded "
2702 "from previous mount: %s", errstr);
2703 ext4_warning(sb, __func__, "Marking fs in need of "
2704 "filesystem check.");
2705
2706 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
2707 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
2708 ext4_commit_super (sb, es, 1);
2709
2710 jbd2_journal_clear_err(journal);
2711 }
2712 }
2713
2714 /*
2715 * Force the running and committing transactions to commit,
2716 * and wait on the commit.
2717 */
2718 int ext4_force_commit(struct super_block *sb)
2719 {
2720 journal_t *journal;
2721 int ret;
2722
2723 if (sb->s_flags & MS_RDONLY)
2724 return 0;
2725
2726 journal = EXT4_SB(sb)->s_journal;
2727 sb->s_dirt = 0;
2728 ret = ext4_journal_force_commit(journal);
2729 return ret;
2730 }
2731
2732 /*
2733 * Ext4 always journals updates to the superblock itself, so we don't
2734 * have to propagate any other updates to the superblock on disk at this
2735 * point. Just start an async writeback to get the buffers on their way
2736 * to the disk.
2737 *
2738 * This implicitly triggers the writebehind on sync().
2739 */
2740
2741 static void ext4_write_super (struct super_block * sb)
2742 {
2743 if (mutex_trylock(&sb->s_lock) != 0)
2744 BUG();
2745 sb->s_dirt = 0;
2746 }
2747
2748 static int ext4_sync_fs(struct super_block *sb, int wait)
2749 {
2750 tid_t target;
2751
2752 sb->s_dirt = 0;
2753 if (jbd2_journal_start_commit(EXT4_SB(sb)->s_journal, &target)) {
2754 if (wait)
2755 jbd2_log_wait_commit(EXT4_SB(sb)->s_journal, target);
2756 }
2757 return 0;
2758 }
2759
2760 /*
2761 * LVM calls this function before a (read-only) snapshot is created. This
2762 * gives us a chance to flush the journal completely and mark the fs clean.
2763 */
2764 static void ext4_write_super_lockfs(struct super_block *sb)
2765 {
2766 sb->s_dirt = 0;
2767
2768 if (!(sb->s_flags & MS_RDONLY)) {
2769 journal_t *journal = EXT4_SB(sb)->s_journal;
2770
2771 /* Now we set up the journal barrier. */
2772 jbd2_journal_lock_updates(journal);
2773 jbd2_journal_flush(journal);
2774
2775 /* Journal blocked and flushed, clear needs_recovery flag. */
2776 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2777 ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1);
2778 }
2779 }
2780
2781 /*
2782 * Called by LVM after the snapshot is done. We need to reset the RECOVER
2783 * flag here, even though the filesystem is not technically dirty yet.
2784 */
2785 static void ext4_unlockfs(struct super_block *sb)
2786 {
2787 if (!(sb->s_flags & MS_RDONLY)) {
2788 lock_super(sb);
2789 /* Reser the needs_recovery flag before the fs is unlocked. */
2790 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2791 ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1);
2792 unlock_super(sb);
2793 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
2794 }
2795 }
2796
2797 static int ext4_remount (struct super_block * sb, int * flags, char * data)
2798 {
2799 struct ext4_super_block * es;
2800 struct ext4_sb_info *sbi = EXT4_SB(sb);
2801 ext4_fsblk_t n_blocks_count = 0;
2802 unsigned long old_sb_flags;
2803 struct ext4_mount_options old_opts;
2804 int err;
2805 #ifdef CONFIG_QUOTA
2806 int i;
2807 #endif
2808
2809 /* Store the original options */
2810 old_sb_flags = sb->s_flags;
2811 old_opts.s_mount_opt = sbi->s_mount_opt;
2812 old_opts.s_resuid = sbi->s_resuid;
2813 old_opts.s_resgid = sbi->s_resgid;
2814 old_opts.s_commit_interval = sbi->s_commit_interval;
2815 #ifdef CONFIG_QUOTA
2816 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
2817 for (i = 0; i < MAXQUOTAS; i++)
2818 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
2819 #endif
2820
2821 /*
2822 * Allow the "check" option to be passed as a remount option.
2823 */
2824 if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
2825 err = -EINVAL;
2826 goto restore_opts;
2827 }
2828
2829 if (sbi->s_mount_opt & EXT4_MOUNT_ABORT)
2830 ext4_abort(sb, __func__, "Abort forced by user");
2831
2832 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
2833 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
2834
2835 es = sbi->s_es;
2836
2837 ext4_init_journal_params(sb, sbi->s_journal);
2838
2839 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
2840 n_blocks_count > ext4_blocks_count(es)) {
2841 if (sbi->s_mount_opt & EXT4_MOUNT_ABORT) {
2842 err = -EROFS;
2843 goto restore_opts;
2844 }
2845
2846 if (*flags & MS_RDONLY) {
2847 /*
2848 * First of all, the unconditional stuff we have to do
2849 * to disable replay of the journal when we next remount
2850 */
2851 sb->s_flags |= MS_RDONLY;
2852
2853 /*
2854 * OK, test if we are remounting a valid rw partition
2855 * readonly, and if so set the rdonly flag and then
2856 * mark the partition as valid again.
2857 */
2858 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
2859 (sbi->s_mount_state & EXT4_VALID_FS))
2860 es->s_state = cpu_to_le16(sbi->s_mount_state);
2861
2862 /*
2863 * We have to unlock super so that we can wait for
2864 * transactions.
2865 */
2866 unlock_super(sb);
2867 ext4_mark_recovery_complete(sb, es);
2868 lock_super(sb);
2869 } else {
2870 __le32 ret;
2871 if ((ret = EXT4_HAS_RO_COMPAT_FEATURE(sb,
2872 ~EXT4_FEATURE_RO_COMPAT_SUPP))) {
2873 printk(KERN_WARNING "EXT4-fs: %s: couldn't "
2874 "remount RDWR because of unsupported "
2875 "optional features (%x).\n",
2876 sb->s_id, le32_to_cpu(ret));
2877 err = -EROFS;
2878 goto restore_opts;
2879 }
2880
2881 /*
2882 * If we have an unprocessed orphan list hanging
2883 * around from a previously readonly bdev mount,
2884 * require a full umount/remount for now.
2885 */
2886 if (es->s_last_orphan) {
2887 printk(KERN_WARNING "EXT4-fs: %s: couldn't "
2888 "remount RDWR because of unprocessed "
2889 "orphan inode list. Please "
2890 "umount/remount instead.\n",
2891 sb->s_id);
2892 err = -EINVAL;
2893 goto restore_opts;
2894 }
2895
2896 /*
2897 * Mounting a RDONLY partition read-write, so reread
2898 * and store the current valid flag. (It may have
2899 * been changed by e2fsck since we originally mounted
2900 * the partition.)
2901 */
2902 ext4_clear_journal_err(sb, es);
2903 sbi->s_mount_state = le16_to_cpu(es->s_state);
2904 if ((err = ext4_group_extend(sb, es, n_blocks_count)))
2905 goto restore_opts;
2906 if (!ext4_setup_super (sb, es, 0))
2907 sb->s_flags &= ~MS_RDONLY;
2908 }
2909 }
2910 #ifdef CONFIG_QUOTA
2911 /* Release old quota file names */
2912 for (i = 0; i < MAXQUOTAS; i++)
2913 if (old_opts.s_qf_names[i] &&
2914 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2915 kfree(old_opts.s_qf_names[i]);
2916 #endif
2917 return 0;
2918 restore_opts:
2919 sb->s_flags = old_sb_flags;
2920 sbi->s_mount_opt = old_opts.s_mount_opt;
2921 sbi->s_resuid = old_opts.s_resuid;
2922 sbi->s_resgid = old_opts.s_resgid;
2923 sbi->s_commit_interval = old_opts.s_commit_interval;
2924 #ifdef CONFIG_QUOTA
2925 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
2926 for (i = 0; i < MAXQUOTAS; i++) {
2927 if (sbi->s_qf_names[i] &&
2928 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2929 kfree(sbi->s_qf_names[i]);
2930 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
2931 }
2932 #endif
2933 return err;
2934 }
2935
2936 static int ext4_statfs (struct dentry * dentry, struct kstatfs * buf)
2937 {
2938 struct super_block *sb = dentry->d_sb;
2939 struct ext4_sb_info *sbi = EXT4_SB(sb);
2940 struct ext4_super_block *es = sbi->s_es;
2941 u64 fsid;
2942
2943 if (test_opt(sb, MINIX_DF)) {
2944 sbi->s_overhead_last = 0;
2945 } else if (sbi->s_blocks_last != ext4_blocks_count(es)) {
2946 ext4_group_t ngroups = sbi->s_groups_count, i;
2947 ext4_fsblk_t overhead = 0;
2948 smp_rmb();
2949
2950 /*
2951 * Compute the overhead (FS structures). This is constant
2952 * for a given filesystem unless the number of block groups
2953 * changes so we cache the previous value until it does.
2954 */
2955
2956 /*
2957 * All of the blocks before first_data_block are
2958 * overhead
2959 */
2960 overhead = le32_to_cpu(es->s_first_data_block);
2961
2962 /*
2963 * Add the overhead attributed to the superblock and
2964 * block group descriptors. If the sparse superblocks
2965 * feature is turned on, then not all groups have this.
2966 */
2967 for (i = 0; i < ngroups; i++) {
2968 overhead += ext4_bg_has_super(sb, i) +
2969 ext4_bg_num_gdb(sb, i);
2970 cond_resched();
2971 }
2972
2973 /*
2974 * Every block group has an inode bitmap, a block
2975 * bitmap, and an inode table.
2976 */
2977 overhead += ngroups * (2 + sbi->s_itb_per_group);
2978 sbi->s_overhead_last = overhead;
2979 smp_wmb();
2980 sbi->s_blocks_last = ext4_blocks_count(es);
2981 }
2982
2983 buf->f_type = EXT4_SUPER_MAGIC;
2984 buf->f_bsize = sb->s_blocksize;
2985 buf->f_blocks = ext4_blocks_count(es) - sbi->s_overhead_last;
2986 buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter);
2987 ext4_free_blocks_count_set(es, buf->f_bfree);
2988 buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es);
2989 if (buf->f_bfree < ext4_r_blocks_count(es))
2990 buf->f_bavail = 0;
2991 buf->f_files = le32_to_cpu(es->s_inodes_count);
2992 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
2993 es->s_free_inodes_count = cpu_to_le32(buf->f_ffree);
2994 buf->f_namelen = EXT4_NAME_LEN;
2995 fsid = le64_to_cpup((void *)es->s_uuid) ^
2996 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
2997 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
2998 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
2999 return 0;
3000 }
3001
3002 /* Helper function for writing quotas on sync - we need to start transaction before quota file
3003 * is locked for write. Otherwise the are possible deadlocks:
3004 * Process 1 Process 2
3005 * ext4_create() quota_sync()
3006 * jbd2_journal_start() write_dquot()
3007 * DQUOT_INIT() down(dqio_mutex)
3008 * down(dqio_mutex) jbd2_journal_start()
3009 *
3010 */
3011
3012 #ifdef CONFIG_QUOTA
3013
3014 static inline struct inode *dquot_to_inode(struct dquot *dquot)
3015 {
3016 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
3017 }
3018
3019 static int ext4_dquot_initialize(struct inode *inode, int type)
3020 {
3021 handle_t *handle;
3022 int ret, err;
3023
3024 /* We may create quota structure so we need to reserve enough blocks */
3025 handle = ext4_journal_start(inode, 2*EXT4_QUOTA_INIT_BLOCKS(inode->i_sb));
3026 if (IS_ERR(handle))
3027 return PTR_ERR(handle);
3028 ret = dquot_initialize(inode, type);
3029 err = ext4_journal_stop(handle);
3030 if (!ret)
3031 ret = err;
3032 return ret;
3033 }
3034
3035 static int ext4_dquot_drop(struct inode *inode)
3036 {
3037 handle_t *handle;
3038 int ret, err;
3039
3040 /* We may delete quota structure so we need to reserve enough blocks */
3041 handle = ext4_journal_start(inode, 2*EXT4_QUOTA_DEL_BLOCKS(inode->i_sb));
3042 if (IS_ERR(handle)) {
3043 /*
3044 * We call dquot_drop() anyway to at least release references
3045 * to quota structures so that umount does not hang.
3046 */
3047 dquot_drop(inode);
3048 return PTR_ERR(handle);
3049 }
3050 ret = dquot_drop(inode);
3051 err = ext4_journal_stop(handle);
3052 if (!ret)
3053 ret = err;
3054 return ret;
3055 }
3056
3057 static int ext4_write_dquot(struct dquot *dquot)
3058 {
3059 int ret, err;
3060 handle_t *handle;
3061 struct inode *inode;
3062
3063 inode = dquot_to_inode(dquot);
3064 handle = ext4_journal_start(inode,
3065 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
3066 if (IS_ERR(handle))
3067 return PTR_ERR(handle);
3068 ret = dquot_commit(dquot);
3069 err = ext4_journal_stop(handle);
3070 if (!ret)
3071 ret = err;
3072 return ret;
3073 }
3074
3075 static int ext4_acquire_dquot(struct dquot *dquot)
3076 {
3077 int ret, err;
3078 handle_t *handle;
3079
3080 handle = ext4_journal_start(dquot_to_inode(dquot),
3081 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
3082 if (IS_ERR(handle))
3083 return PTR_ERR(handle);
3084 ret = dquot_acquire(dquot);
3085 err = ext4_journal_stop(handle);
3086 if (!ret)
3087 ret = err;
3088 return ret;
3089 }
3090
3091 static int ext4_release_dquot(struct dquot *dquot)
3092 {
3093 int ret, err;
3094 handle_t *handle;
3095
3096 handle = ext4_journal_start(dquot_to_inode(dquot),
3097 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
3098 if (IS_ERR(handle)) {
3099 /* Release dquot anyway to avoid endless cycle in dqput() */
3100 dquot_release(dquot);
3101 return PTR_ERR(handle);
3102 }
3103 ret = dquot_release(dquot);
3104 err = ext4_journal_stop(handle);
3105 if (!ret)
3106 ret = err;
3107 return ret;
3108 }
3109
3110 static int ext4_mark_dquot_dirty(struct dquot *dquot)
3111 {
3112 /* Are we journalling quotas? */
3113 if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
3114 EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
3115 dquot_mark_dquot_dirty(dquot);
3116 return ext4_write_dquot(dquot);
3117 } else {
3118 return dquot_mark_dquot_dirty(dquot);
3119 }
3120 }
3121
3122 static int ext4_write_info(struct super_block *sb, int type)
3123 {
3124 int ret, err;
3125 handle_t *handle;
3126
3127 /* Data block + inode block */
3128 handle = ext4_journal_start(sb->s_root->d_inode, 2);
3129 if (IS_ERR(handle))
3130 return PTR_ERR(handle);
3131 ret = dquot_commit_info(sb, type);
3132 err = ext4_journal_stop(handle);
3133 if (!ret)
3134 ret = err;
3135 return ret;
3136 }
3137
3138 /*
3139 * Turn on quotas during mount time - we need to find
3140 * the quota file and such...
3141 */
3142 static int ext4_quota_on_mount(struct super_block *sb, int type)
3143 {
3144 return vfs_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
3145 EXT4_SB(sb)->s_jquota_fmt, type);
3146 }
3147
3148 /*
3149 * Standard function to be called on quota_on
3150 */
3151 static int ext4_quota_on(struct super_block *sb, int type, int format_id,
3152 char *path, int remount)
3153 {
3154 int err;
3155 struct nameidata nd;
3156
3157 if (!test_opt(sb, QUOTA))
3158 return -EINVAL;
3159 /* Not journalling quota? */
3160 if ((!EXT4_SB(sb)->s_qf_names[USRQUOTA] &&
3161 !EXT4_SB(sb)->s_qf_names[GRPQUOTA]) || remount)
3162 return vfs_quota_on(sb, type, format_id, path, remount);
3163 err = path_lookup(path, LOOKUP_FOLLOW, &nd);
3164 if (err)
3165 return err;
3166 /* Quotafile not on the same filesystem? */
3167 if (nd.path.mnt->mnt_sb != sb) {
3168 path_put(&nd.path);
3169 return -EXDEV;
3170 }
3171 /* Quotafile not of fs root? */
3172 if (nd.path.dentry->d_parent->d_inode != sb->s_root->d_inode)
3173 printk(KERN_WARNING
3174 "EXT4-fs: Quota file not on filesystem root. "
3175 "Journalled quota will not work.\n");
3176 path_put(&nd.path);
3177 return vfs_quota_on(sb, type, format_id, path, remount);
3178 }
3179
3180 /* Read data from quotafile - avoid pagecache and such because we cannot afford
3181 * acquiring the locks... As quota files are never truncated and quota code
3182 * itself serializes the operations (and noone else should touch the files)
3183 * we don't have to be afraid of races */
3184 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
3185 size_t len, loff_t off)
3186 {
3187 struct inode *inode = sb_dqopt(sb)->files[type];
3188 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
3189 int err = 0;
3190 int offset = off & (sb->s_blocksize - 1);
3191 int tocopy;
3192 size_t toread;
3193 struct buffer_head *bh;
3194 loff_t i_size = i_size_read(inode);
3195
3196 if (off > i_size)
3197 return 0;
3198 if (off+len > i_size)
3199 len = i_size-off;
3200 toread = len;
3201 while (toread > 0) {
3202 tocopy = sb->s_blocksize - offset < toread ?
3203 sb->s_blocksize - offset : toread;
3204 bh = ext4_bread(NULL, inode, blk, 0, &err);
3205 if (err)
3206 return err;
3207 if (!bh) /* A hole? */
3208 memset(data, 0, tocopy);
3209 else
3210 memcpy(data, bh->b_data+offset, tocopy);
3211 brelse(bh);
3212 offset = 0;
3213 toread -= tocopy;
3214 data += tocopy;
3215 blk++;
3216 }
3217 return len;
3218 }
3219
3220 /* Write to quotafile (we know the transaction is already started and has
3221 * enough credits) */
3222 static ssize_t ext4_quota_write(struct super_block *sb, int type,
3223 const char *data, size_t len, loff_t off)
3224 {
3225 struct inode *inode = sb_dqopt(sb)->files[type];
3226 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
3227 int err = 0;
3228 int offset = off & (sb->s_blocksize - 1);
3229 int tocopy;
3230 int journal_quota = EXT4_SB(sb)->s_qf_names[type] != NULL;
3231 size_t towrite = len;
3232 struct buffer_head *bh;
3233 handle_t *handle = journal_current_handle();
3234
3235 if (!handle) {
3236 printk(KERN_WARNING "EXT4-fs: Quota write (off=%Lu, len=%Lu)"
3237 " cancelled because transaction is not started.\n",
3238 (unsigned long long)off, (unsigned long long)len);
3239 return -EIO;
3240 }
3241 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
3242 while (towrite > 0) {
3243 tocopy = sb->s_blocksize - offset < towrite ?
3244 sb->s_blocksize - offset : towrite;
3245 bh = ext4_bread(handle, inode, blk, 1, &err);
3246 if (!bh)
3247 goto out;
3248 if (journal_quota) {
3249 err = ext4_journal_get_write_access(handle, bh);
3250 if (err) {
3251 brelse(bh);
3252 goto out;
3253 }
3254 }
3255 lock_buffer(bh);
3256 memcpy(bh->b_data+offset, data, tocopy);
3257 flush_dcache_page(bh->b_page);
3258 unlock_buffer(bh);
3259 if (journal_quota)
3260 err = ext4_journal_dirty_metadata(handle, bh);
3261 else {
3262 /* Always do at least ordered writes for quotas */
3263 err = ext4_journal_dirty_data(handle, bh);
3264 mark_buffer_dirty(bh);
3265 }
3266 brelse(bh);
3267 if (err)
3268 goto out;
3269 offset = 0;
3270 towrite -= tocopy;
3271 data += tocopy;
3272 blk++;
3273 }
3274 out:
3275 if (len == towrite)
3276 return err;
3277 if (inode->i_size < off+len-towrite) {
3278 i_size_write(inode, off+len-towrite);
3279 EXT4_I(inode)->i_disksize = inode->i_size;
3280 }
3281 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
3282 ext4_mark_inode_dirty(handle, inode);
3283 mutex_unlock(&inode->i_mutex);
3284 return len - towrite;
3285 }
3286
3287 #endif
3288
3289 static int ext4_get_sb(struct file_system_type *fs_type,
3290 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
3291 {
3292 return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super, mnt);
3293 }
3294
3295 static struct file_system_type ext4dev_fs_type = {
3296 .owner = THIS_MODULE,
3297 .name = "ext4dev",
3298 .get_sb = ext4_get_sb,
3299 .kill_sb = kill_block_super,
3300 .fs_flags = FS_REQUIRES_DEV,
3301 };
3302
3303 static int __init init_ext4_fs(void)
3304 {
3305 int err;
3306
3307 err = init_ext4_mballoc();
3308 if (err)
3309 return err;
3310
3311 err = init_ext4_xattr();
3312 if (err)
3313 goto out2;
3314 err = init_inodecache();
3315 if (err)
3316 goto out1;
3317 err = register_filesystem(&ext4dev_fs_type);
3318 if (err)
3319 goto out;
3320 return 0;
3321 out:
3322 destroy_inodecache();
3323 out1:
3324 exit_ext4_xattr();
3325 out2:
3326 exit_ext4_mballoc();
3327 return err;
3328 }
3329
3330 static void __exit exit_ext4_fs(void)
3331 {
3332 unregister_filesystem(&ext4dev_fs_type);
3333 destroy_inodecache();
3334 exit_ext4_xattr();
3335 exit_ext4_mballoc();
3336 }
3337
3338 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
3339 MODULE_DESCRIPTION("Fourth Extended Filesystem with extents");
3340 MODULE_LICENSE("GPL");
3341 module_init(init_ext4_fs)
3342 module_exit(exit_ext4_fs)
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