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ext4: fix oops on corrupted ext4 mount
[linux-2.6/x86.git] / fs / ext4 / super.c
blob32e3ecb35cd7ac9c654959fda61c95dd37ebbf66
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/ext4_fs.h>
25 #include <linux/ext4_jbd2.h>
26 #include <linux/slab.h>
27 #include <linux/init.h>
28 #include <linux/blkdev.h>
29 #include <linux/parser.h>
30 #include <linux/smp_lock.h>
31 #include <linux/buffer_head.h>
32 #include <linux/exportfs.h>
33 #include <linux/vfs.h>
34 #include <linux/random.h>
35 #include <linux/mount.h>
36 #include <linux/namei.h>
37 #include <linux/quotaops.h>
38 #include <linux/seq_file.h>
39 #include <linux/log2.h>
40 #include <linux/crc16.h>
41
42 #include <asm/uaccess.h>
43
44 #include "xattr.h"
45 #include "acl.h"
46 #include "namei.h"
47 #include "group.h"
48
49 static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
50 unsigned long journal_devnum);
51 static int ext4_create_journal(struct super_block *, struct ext4_super_block *,
52 unsigned int);
53 static void ext4_commit_super (struct super_block * sb,
54 struct ext4_super_block * es,
55 int sync);
56 static void ext4_mark_recovery_complete(struct super_block * sb,
57 struct ext4_super_block * es);
58 static void ext4_clear_journal_err(struct super_block * sb,
59 struct ext4_super_block * es);
60 static int ext4_sync_fs(struct super_block *sb, int wait);
61 static const char *ext4_decode_error(struct super_block * sb, int errno,
62 char nbuf[16]);
63 static int ext4_remount (struct super_block * sb, int * flags, char * data);
64 static int ext4_statfs (struct dentry * dentry, struct kstatfs * buf);
65 static void ext4_unlockfs(struct super_block *sb);
66 static void ext4_write_super (struct super_block * sb);
67 static void ext4_write_super_lockfs(struct super_block *sb);
68
69
70 ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
71 struct ext4_group_desc *bg)
72 {
73 return le32_to_cpu(bg->bg_block_bitmap_lo) |
74 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
75 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
76 }
77
78 ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
79 struct ext4_group_desc *bg)
80 {
81 return le32_to_cpu(bg->bg_inode_bitmap_lo) |
82 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
83 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
84 }
85
86 ext4_fsblk_t ext4_inode_table(struct super_block *sb,
87 struct ext4_group_desc *bg)
88 {
89 return le32_to_cpu(bg->bg_inode_table_lo) |
90 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
91 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
92 }
93
94 void ext4_block_bitmap_set(struct super_block *sb,
95 struct ext4_group_desc *bg, ext4_fsblk_t blk)
96 {
97 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
98 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
99 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
100 }
101
102 void ext4_inode_bitmap_set(struct super_block *sb,
103 struct ext4_group_desc *bg, ext4_fsblk_t blk)
104 {
105 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk);
106 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
107 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
108 }
109
110 void ext4_inode_table_set(struct super_block *sb,
111 struct ext4_group_desc *bg, ext4_fsblk_t blk)
112 {
113 bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
114 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
115 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
116 }
117
118 /*
119 * Wrappers for jbd2_journal_start/end.
120 *
121 * The only special thing we need to do here is to make sure that all
122 * journal_end calls result in the superblock being marked dirty, so
123 * that sync() will call the filesystem's write_super callback if
124 * appropriate.
125 */
126 handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks)
127 {
128 journal_t *journal;
129
130 if (sb->s_flags & MS_RDONLY)
131 return ERR_PTR(-EROFS);
132
133 /* Special case here: if the journal has aborted behind our
134 * backs (eg. EIO in the commit thread), then we still need to
135 * take the FS itself readonly cleanly. */
136 journal = EXT4_SB(sb)->s_journal;
137 if (is_journal_aborted(journal)) {
138 ext4_abort(sb, __FUNCTION__,
139 "Detected aborted journal");
140 return ERR_PTR(-EROFS);
141 }
142
143 return jbd2_journal_start(journal, nblocks);
144 }
145
146 /*
147 * The only special thing we need to do here is to make sure that all
148 * jbd2_journal_stop calls result in the superblock being marked dirty, so
149 * that sync() will call the filesystem's write_super callback if
150 * appropriate.
151 */
152 int __ext4_journal_stop(const char *where, handle_t *handle)
153 {
154 struct super_block *sb;
155 int err;
156 int rc;
157
158 sb = handle->h_transaction->t_journal->j_private;
159 err = handle->h_err;
160 rc = jbd2_journal_stop(handle);
161
162 if (!err)
163 err = rc;
164 if (err)
165 __ext4_std_error(sb, where, err);
166 return err;
167 }
168
169 void ext4_journal_abort_handle(const char *caller, const char *err_fn,
170 struct buffer_head *bh, handle_t *handle, int err)
171 {
172 char nbuf[16];
173 const char *errstr = ext4_decode_error(NULL, err, nbuf);
174
175 if (bh)
176 BUFFER_TRACE(bh, "abort");
177
178 if (!handle->h_err)
179 handle->h_err = err;
180
181 if (is_handle_aborted(handle))
182 return;
183
184 printk(KERN_ERR "%s: aborting transaction: %s in %s\n",
185 caller, errstr, err_fn);
186
187 jbd2_journal_abort_handle(handle);
188 }
189
190 /* Deal with the reporting of failure conditions on a filesystem such as
191 * inconsistencies detected or read IO failures.
192 *
193 * On ext2, we can store the error state of the filesystem in the
194 * superblock. That is not possible on ext4, because we may have other
195 * write ordering constraints on the superblock which prevent us from
196 * writing it out straight away; and given that the journal is about to
197 * be aborted, we can't rely on the current, or future, transactions to
198 * write out the superblock safely.
199 *
200 * We'll just use the jbd2_journal_abort() error code to record an error in
201 * the journal instead. On recovery, the journal will compain about
202 * that error until we've noted it down and cleared it.
203 */
204
205 static void ext4_handle_error(struct super_block *sb)
206 {
207 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
208
209 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
210 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
211
212 if (sb->s_flags & MS_RDONLY)
213 return;
214
215 if (!test_opt (sb, ERRORS_CONT)) {
216 journal_t *journal = EXT4_SB(sb)->s_journal;
217
218 EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT;
219 if (journal)
220 jbd2_journal_abort(journal, -EIO);
221 }
222 if (test_opt (sb, ERRORS_RO)) {
223 printk (KERN_CRIT "Remounting filesystem read-only\n");
224 sb->s_flags |= MS_RDONLY;
225 }
226 ext4_commit_super(sb, es, 1);
227 if (test_opt(sb, ERRORS_PANIC))
228 panic("EXT4-fs (device %s): panic forced after error\n",
229 sb->s_id);
230 }
231
232 void ext4_error (struct super_block * sb, const char * function,
233 const char * fmt, ...)
234 {
235 va_list args;
236
237 va_start(args, fmt);
238 printk(KERN_CRIT "EXT4-fs error (device %s): %s: ",sb->s_id, function);
239 vprintk(fmt, args);
240 printk("\n");
241 va_end(args);
242
243 ext4_handle_error(sb);
244 }
245
246 static const char *ext4_decode_error(struct super_block * sb, int errno,
247 char nbuf[16])
248 {
249 char *errstr = NULL;
250
251 switch (errno) {
252 case -EIO:
253 errstr = "IO failure";
254 break;
255 case -ENOMEM:
256 errstr = "Out of memory";
257 break;
258 case -EROFS:
259 if (!sb || EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT)
260 errstr = "Journal has aborted";
261 else
262 errstr = "Readonly filesystem";
263 break;
264 default:
265 /* If the caller passed in an extra buffer for unknown
266 * errors, textualise them now. Else we just return
267 * NULL. */
268 if (nbuf) {
269 /* Check for truncated error codes... */
270 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
271 errstr = nbuf;
272 }
273 break;
274 }
275
276 return errstr;
277 }
278
279 /* __ext4_std_error decodes expected errors from journaling functions
280 * automatically and invokes the appropriate error response. */
281
282 void __ext4_std_error (struct super_block * sb, const char * function,
283 int errno)
284 {
285 char nbuf[16];
286 const char *errstr;
287
288 /* Special case: if the error is EROFS, and we're not already
289 * inside a transaction, then there's really no point in logging
290 * an error. */
291 if (errno == -EROFS && journal_current_handle() == NULL &&
292 (sb->s_flags & MS_RDONLY))
293 return;
294
295 errstr = ext4_decode_error(sb, errno, nbuf);
296 printk (KERN_CRIT "EXT4-fs error (device %s) in %s: %s\n",
297 sb->s_id, function, errstr);
298
299 ext4_handle_error(sb);
300 }
301
302 /*
303 * ext4_abort is a much stronger failure handler than ext4_error. The
304 * abort function may be used to deal with unrecoverable failures such
305 * as journal IO errors or ENOMEM at a critical moment in log management.
306 *
307 * We unconditionally force the filesystem into an ABORT|READONLY state,
308 * unless the error response on the fs has been set to panic in which
309 * case we take the easy way out and panic immediately.
310 */
311
312 void ext4_abort (struct super_block * sb, const char * function,
313 const char * fmt, ...)
314 {
315 va_list args;
316
317 printk (KERN_CRIT "ext4_abort called.\n");
318
319 va_start(args, fmt);
320 printk(KERN_CRIT "EXT4-fs error (device %s): %s: ",sb->s_id, function);
321 vprintk(fmt, args);
322 printk("\n");
323 va_end(args);
324
325 if (test_opt(sb, ERRORS_PANIC))
326 panic("EXT4-fs panic from previous error\n");
327
328 if (sb->s_flags & MS_RDONLY)
329 return;
330
331 printk(KERN_CRIT "Remounting filesystem read-only\n");
332 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
333 sb->s_flags |= MS_RDONLY;
334 EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT;
335 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
336 }
337
338 void ext4_warning (struct super_block * sb, const char * function,
339 const char * fmt, ...)
340 {
341 va_list args;
342
343 va_start(args, fmt);
344 printk(KERN_WARNING "EXT4-fs warning (device %s): %s: ",
345 sb->s_id, function);
346 vprintk(fmt, args);
347 printk("\n");
348 va_end(args);
349 }
350
351 void ext4_update_dynamic_rev(struct super_block *sb)
352 {
353 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
354
355 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
356 return;
357
358 ext4_warning(sb, __FUNCTION__,
359 "updating to rev %d because of new feature flag, "
360 "running e2fsck is recommended",
361 EXT4_DYNAMIC_REV);
362
363 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
364 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
365 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
366 /* leave es->s_feature_*compat flags alone */
367 /* es->s_uuid will be set by e2fsck if empty */
368
369 /*
370 * The rest of the superblock fields should be zero, and if not it
371 * means they are likely already in use, so leave them alone. We
372 * can leave it up to e2fsck to clean up any inconsistencies there.
373 */
374 }
375
376 int ext4_update_compat_feature(handle_t *handle,
377 struct super_block *sb, __u32 compat)
378 {
379 int err = 0;
380 if (!EXT4_HAS_COMPAT_FEATURE(sb, compat)) {
381 err = ext4_journal_get_write_access(handle,
382 EXT4_SB(sb)->s_sbh);
383 if (err)
384 return err;
385 EXT4_SET_COMPAT_FEATURE(sb, compat);
386 sb->s_dirt = 1;
387 handle->h_sync = 1;
388 BUFFER_TRACE(EXT4_SB(sb)->s_sbh,
389 "call ext4_journal_dirty_met adata");
390 err = ext4_journal_dirty_metadata(handle,
391 EXT4_SB(sb)->s_sbh);
392 }
393 return err;
394 }
395
396 int ext4_update_rocompat_feature(handle_t *handle,
397 struct super_block *sb, __u32 rocompat)
398 {
399 int err = 0;
400 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, rocompat)) {
401 err = ext4_journal_get_write_access(handle,
402 EXT4_SB(sb)->s_sbh);
403 if (err)
404 return err;
405 EXT4_SET_RO_COMPAT_FEATURE(sb, rocompat);
406 sb->s_dirt = 1;
407 handle->h_sync = 1;
408 BUFFER_TRACE(EXT4_SB(sb)->s_sbh,
409 "call ext4_journal_dirty_met adata");
410 err = ext4_journal_dirty_metadata(handle,
411 EXT4_SB(sb)->s_sbh);
412 }
413 return err;
414 }
415
416 int ext4_update_incompat_feature(handle_t *handle,
417 struct super_block *sb, __u32 incompat)
418 {
419 int err = 0;
420 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, incompat)) {
421 err = ext4_journal_get_write_access(handle,
422 EXT4_SB(sb)->s_sbh);
423 if (err)
424 return err;
425 EXT4_SET_INCOMPAT_FEATURE(sb, incompat);
426 sb->s_dirt = 1;
427 handle->h_sync = 1;
428 BUFFER_TRACE(EXT4_SB(sb)->s_sbh,
429 "call ext4_journal_dirty_met adata");
430 err = ext4_journal_dirty_metadata(handle,
431 EXT4_SB(sb)->s_sbh);
432 }
433 return err;
434 }
435
436 /*
437 * Open the external journal device
438 */
439 static struct block_device *ext4_blkdev_get(dev_t dev)
440 {
441 struct block_device *bdev;
442 char b[BDEVNAME_SIZE];
443
444 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
445 if (IS_ERR(bdev))
446 goto fail;
447 return bdev;
448
449 fail:
450 printk(KERN_ERR "EXT4: failed to open journal device %s: %ld\n",
451 __bdevname(dev, b), PTR_ERR(bdev));
452 return NULL;
453 }
454
455 /*
456 * Release the journal device
457 */
458 static int ext4_blkdev_put(struct block_device *bdev)
459 {
460 bd_release(bdev);
461 return blkdev_put(bdev);
462 }
463
464 static int ext4_blkdev_remove(struct ext4_sb_info *sbi)
465 {
466 struct block_device *bdev;
467 int ret = -ENODEV;
468
469 bdev = sbi->journal_bdev;
470 if (bdev) {
471 ret = ext4_blkdev_put(bdev);
472 sbi->journal_bdev = NULL;
473 }
474 return ret;
475 }
476
477 static inline struct inode *orphan_list_entry(struct list_head *l)
478 {
479 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
480 }
481
482 static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
483 {
484 struct list_head *l;
485
486 printk(KERN_ERR "sb orphan head is %d\n",
487 le32_to_cpu(sbi->s_es->s_last_orphan));
488
489 printk(KERN_ERR "sb_info orphan list:\n");
490 list_for_each(l, &sbi->s_orphan) {
491 struct inode *inode = orphan_list_entry(l);
492 printk(KERN_ERR " "
493 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
494 inode->i_sb->s_id, inode->i_ino, inode,
495 inode->i_mode, inode->i_nlink,
496 NEXT_ORPHAN(inode));
497 }
498 }
499
500 static void ext4_put_super (struct super_block * sb)
501 {
502 struct ext4_sb_info *sbi = EXT4_SB(sb);
503 struct ext4_super_block *es = sbi->s_es;
504 int i;
505
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 return &ei->vfs_inode;
573 }
574
575 static void ext4_destroy_inode(struct inode *inode)
576 {
577 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
578 printk("EXT4 Inode %p: orphan list check failed!\n",
579 EXT4_I(inode));
580 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
581 EXT4_I(inode), sizeof(struct ext4_inode_info),
582 true);
583 dump_stack();
584 }
585 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
586 }
587
588 static void init_once(struct kmem_cache *cachep, void *foo)
589 {
590 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
591
592 INIT_LIST_HEAD(&ei->i_orphan);
593 #ifdef CONFIG_EXT4DEV_FS_XATTR
594 init_rwsem(&ei->xattr_sem);
595 #endif
596 mutex_init(&ei->truncate_mutex);
597 inode_init_once(&ei->vfs_inode);
598 }
599
600 static int init_inodecache(void)
601 {
602 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
603 sizeof(struct ext4_inode_info),
604 0, (SLAB_RECLAIM_ACCOUNT|
605 SLAB_MEM_SPREAD),
606 init_once);
607 if (ext4_inode_cachep == NULL)
608 return -ENOMEM;
609 return 0;
610 }
611
612 static void destroy_inodecache(void)
613 {
614 kmem_cache_destroy(ext4_inode_cachep);
615 }
616
617 static void ext4_clear_inode(struct inode *inode)
618 {
619 struct ext4_block_alloc_info *rsv = EXT4_I(inode)->i_block_alloc_info;
620 #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
621 if (EXT4_I(inode)->i_acl &&
622 EXT4_I(inode)->i_acl != EXT4_ACL_NOT_CACHED) {
623 posix_acl_release(EXT4_I(inode)->i_acl);
624 EXT4_I(inode)->i_acl = EXT4_ACL_NOT_CACHED;
625 }
626 if (EXT4_I(inode)->i_default_acl &&
627 EXT4_I(inode)->i_default_acl != EXT4_ACL_NOT_CACHED) {
628 posix_acl_release(EXT4_I(inode)->i_default_acl);
629 EXT4_I(inode)->i_default_acl = EXT4_ACL_NOT_CACHED;
630 }
631 #endif
632 ext4_discard_reservation(inode);
633 EXT4_I(inode)->i_block_alloc_info = NULL;
634 if (unlikely(rsv))
635 kfree(rsv);
636 }
637
638 static inline void ext4_show_quota_options(struct seq_file *seq, struct super_block *sb)
639 {
640 #if defined(CONFIG_QUOTA)
641 struct ext4_sb_info *sbi = EXT4_SB(sb);
642
643 if (sbi->s_jquota_fmt)
644 seq_printf(seq, ",jqfmt=%s",
645 (sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold": "vfsv0");
646
647 if (sbi->s_qf_names[USRQUOTA])
648 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
649
650 if (sbi->s_qf_names[GRPQUOTA])
651 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
652
653 if (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA)
654 seq_puts(seq, ",usrquota");
655
656 if (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)
657 seq_puts(seq, ",grpquota");
658 #endif
659 }
660
661 /*
662 * Show an option if
663 * - it's set to a non-default value OR
664 * - if the per-sb default is different from the global default
665 */
666 static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs)
667 {
668 struct super_block *sb = vfs->mnt_sb;
669 struct ext4_sb_info *sbi = EXT4_SB(sb);
670 struct ext4_super_block *es = sbi->s_es;
671 unsigned long def_mount_opts;
672
673 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
674
675 if (sbi->s_sb_block != 1)
676 seq_printf(seq, ",sb=%llu", sbi->s_sb_block);
677 if (test_opt(sb, MINIX_DF))
678 seq_puts(seq, ",minixdf");
679 if (test_opt(sb, GRPID))
680 seq_puts(seq, ",grpid");
681 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT4_DEFM_BSDGROUPS))
682 seq_puts(seq, ",nogrpid");
683 if (sbi->s_resuid != EXT4_DEF_RESUID ||
684 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID) {
685 seq_printf(seq, ",resuid=%u", sbi->s_resuid);
686 }
687 if (sbi->s_resgid != EXT4_DEF_RESGID ||
688 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID) {
689 seq_printf(seq, ",resgid=%u", sbi->s_resgid);
690 }
691 if (test_opt(sb, ERRORS_CONT)) {
692 int def_errors = le16_to_cpu(es->s_errors);
693
694 if (def_errors == EXT4_ERRORS_PANIC ||
695 def_errors == EXT4_ERRORS_RO) {
696 seq_puts(seq, ",errors=continue");
697 }
698 }
699 if (test_opt(sb, ERRORS_RO))
700 seq_puts(seq, ",errors=remount-ro");
701 if (test_opt(sb, ERRORS_PANIC))
702 seq_puts(seq, ",errors=panic");
703 if (test_opt(sb, NO_UID32))
704 seq_puts(seq, ",nouid32");
705 if (test_opt(sb, DEBUG))
706 seq_puts(seq, ",debug");
707 if (test_opt(sb, OLDALLOC))
708 seq_puts(seq, ",oldalloc");
709 #ifdef CONFIG_EXT4DEV_FS_XATTR
710 if (test_opt(sb, XATTR_USER))
711 seq_puts(seq, ",user_xattr");
712 if (!test_opt(sb, XATTR_USER) &&
713 (def_mount_opts & EXT4_DEFM_XATTR_USER)) {
714 seq_puts(seq, ",nouser_xattr");
715 }
716 #endif
717 #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
718 if (test_opt(sb, POSIX_ACL))
719 seq_puts(seq, ",acl");
720 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT4_DEFM_ACL))
721 seq_puts(seq, ",noacl");
722 #endif
723 if (!test_opt(sb, RESERVATION))
724 seq_puts(seq, ",noreservation");
725 if (sbi->s_commit_interval) {
726 seq_printf(seq, ",commit=%u",
727 (unsigned) (sbi->s_commit_interval / HZ));
728 }
729 if (test_opt(sb, BARRIER))
730 seq_puts(seq, ",barrier=1");
731 if (test_opt(sb, NOBH))
732 seq_puts(seq, ",nobh");
733 if (!test_opt(sb, EXTENTS))
734 seq_puts(seq, ",noextents");
735
736 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
737 seq_puts(seq, ",data=journal");
738 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
739 seq_puts(seq, ",data=ordered");
740 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
741 seq_puts(seq, ",data=writeback");
742
743 ext4_show_quota_options(seq, sb);
744
745 return 0;
746 }
747
748
749 static struct inode *ext4_nfs_get_inode(struct super_block *sb,
750 u64 ino, u32 generation)
751 {
752 struct inode *inode;
753
754 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
755 return ERR_PTR(-ESTALE);
756 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
757 return ERR_PTR(-ESTALE);
758
759 /* iget isn't really right if the inode is currently unallocated!!
760 *
761 * ext4_read_inode will return a bad_inode if the inode had been
762 * deleted, so we should be safe.
763 *
764 * Currently we don't know the generation for parent directory, so
765 * a generation of 0 means "accept any"
766 */
767 inode = iget(sb, ino);
768 if (inode == NULL)
769 return ERR_PTR(-ENOMEM);
770 if (is_bad_inode(inode) ||
771 (generation && inode->i_generation != generation)) {
772 iput(inode);
773 return ERR_PTR(-ESTALE);
774 }
775
776 return inode;
777 }
778
779 static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
780 int fh_len, int fh_type)
781 {
782 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
783 ext4_nfs_get_inode);
784 }
785
786 static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
787 int fh_len, int fh_type)
788 {
789 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
790 ext4_nfs_get_inode);
791 }
792
793 #ifdef CONFIG_QUOTA
794 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
795 #define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
796
797 static int ext4_dquot_initialize(struct inode *inode, int type);
798 static int ext4_dquot_drop(struct inode *inode);
799 static int ext4_write_dquot(struct dquot *dquot);
800 static int ext4_acquire_dquot(struct dquot *dquot);
801 static int ext4_release_dquot(struct dquot *dquot);
802 static int ext4_mark_dquot_dirty(struct dquot *dquot);
803 static int ext4_write_info(struct super_block *sb, int type);
804 static int ext4_quota_on(struct super_block *sb, int type, int format_id, char *path);
805 static int ext4_quota_on_mount(struct super_block *sb, int type);
806 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
807 size_t len, loff_t off);
808 static ssize_t ext4_quota_write(struct super_block *sb, int type,
809 const char *data, size_t len, loff_t off);
810
811 static struct dquot_operations ext4_quota_operations = {
812 .initialize = ext4_dquot_initialize,
813 .drop = ext4_dquot_drop,
814 .alloc_space = dquot_alloc_space,
815 .alloc_inode = dquot_alloc_inode,
816 .free_space = dquot_free_space,
817 .free_inode = dquot_free_inode,
818 .transfer = dquot_transfer,
819 .write_dquot = ext4_write_dquot,
820 .acquire_dquot = ext4_acquire_dquot,
821 .release_dquot = ext4_release_dquot,
822 .mark_dirty = ext4_mark_dquot_dirty,
823 .write_info = ext4_write_info
824 };
825
826 static struct quotactl_ops ext4_qctl_operations = {
827 .quota_on = ext4_quota_on,
828 .quota_off = vfs_quota_off,
829 .quota_sync = vfs_quota_sync,
830 .get_info = vfs_get_dqinfo,
831 .set_info = vfs_set_dqinfo,
832 .get_dqblk = vfs_get_dqblk,
833 .set_dqblk = vfs_set_dqblk
834 };
835 #endif
836
837 static const struct super_operations ext4_sops = {
838 .alloc_inode = ext4_alloc_inode,
839 .destroy_inode = ext4_destroy_inode,
840 .read_inode = ext4_read_inode,
841 .write_inode = ext4_write_inode,
842 .dirty_inode = ext4_dirty_inode,
843 .delete_inode = ext4_delete_inode,
844 .put_super = ext4_put_super,
845 .write_super = ext4_write_super,
846 .sync_fs = ext4_sync_fs,
847 .write_super_lockfs = ext4_write_super_lockfs,
848 .unlockfs = ext4_unlockfs,
849 .statfs = ext4_statfs,
850 .remount_fs = ext4_remount,
851 .clear_inode = ext4_clear_inode,
852 .show_options = ext4_show_options,
853 #ifdef CONFIG_QUOTA
854 .quota_read = ext4_quota_read,
855 .quota_write = ext4_quota_write,
856 #endif
857 };
858
859 static const struct export_operations ext4_export_ops = {
860 .fh_to_dentry = ext4_fh_to_dentry,
861 .fh_to_parent = ext4_fh_to_parent,
862 .get_parent = ext4_get_parent,
863 };
864
865 enum {
866 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
867 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
868 Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
869 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
870 Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh,
871 Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
872 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
873 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
874 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota,
875 Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota,
876 Opt_grpquota, Opt_extents, Opt_noextents,
877 };
878
879 static match_table_t tokens = {
880 {Opt_bsd_df, "bsddf"},
881 {Opt_minix_df, "minixdf"},
882 {Opt_grpid, "grpid"},
883 {Opt_grpid, "bsdgroups"},
884 {Opt_nogrpid, "nogrpid"},
885 {Opt_nogrpid, "sysvgroups"},
886 {Opt_resgid, "resgid=%u"},
887 {Opt_resuid, "resuid=%u"},
888 {Opt_sb, "sb=%u"},
889 {Opt_err_cont, "errors=continue"},
890 {Opt_err_panic, "errors=panic"},
891 {Opt_err_ro, "errors=remount-ro"},
892 {Opt_nouid32, "nouid32"},
893 {Opt_nocheck, "nocheck"},
894 {Opt_nocheck, "check=none"},
895 {Opt_debug, "debug"},
896 {Opt_oldalloc, "oldalloc"},
897 {Opt_orlov, "orlov"},
898 {Opt_user_xattr, "user_xattr"},
899 {Opt_nouser_xattr, "nouser_xattr"},
900 {Opt_acl, "acl"},
901 {Opt_noacl, "noacl"},
902 {Opt_reservation, "reservation"},
903 {Opt_noreservation, "noreservation"},
904 {Opt_noload, "noload"},
905 {Opt_nobh, "nobh"},
906 {Opt_bh, "bh"},
907 {Opt_commit, "commit=%u"},
908 {Opt_journal_update, "journal=update"},
909 {Opt_journal_inum, "journal=%u"},
910 {Opt_journal_dev, "journal_dev=%u"},
911 {Opt_abort, "abort"},
912 {Opt_data_journal, "data=journal"},
913 {Opt_data_ordered, "data=ordered"},
914 {Opt_data_writeback, "data=writeback"},
915 {Opt_offusrjquota, "usrjquota="},
916 {Opt_usrjquota, "usrjquota=%s"},
917 {Opt_offgrpjquota, "grpjquota="},
918 {Opt_grpjquota, "grpjquota=%s"},
919 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
920 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
921 {Opt_grpquota, "grpquota"},
922 {Opt_noquota, "noquota"},
923 {Opt_quota, "quota"},
924 {Opt_usrquota, "usrquota"},
925 {Opt_barrier, "barrier=%u"},
926 {Opt_extents, "extents"},
927 {Opt_noextents, "noextents"},
928 {Opt_err, NULL},
929 {Opt_resize, "resize"},
930 };
931
932 static ext4_fsblk_t get_sb_block(void **data)
933 {
934 ext4_fsblk_t sb_block;
935 char *options = (char *) *data;
936
937 if (!options || strncmp(options, "sb=", 3) != 0)
938 return 1; /* Default location */
939 options += 3;
940 /*todo: use simple_strtoll with >32bit ext4 */
941 sb_block = simple_strtoul(options, &options, 0);
942 if (*options && *options != ',') {
943 printk("EXT4-fs: Invalid sb specification: %s\n",
944 (char *) *data);
945 return 1;
946 }
947 if (*options == ',')
948 options++;
949 *data = (void *) options;
950 return sb_block;
951 }
952
953 static int parse_options (char *options, struct super_block *sb,
954 unsigned int *inum, unsigned long *journal_devnum,
955 ext4_fsblk_t *n_blocks_count, int is_remount)
956 {
957 struct ext4_sb_info *sbi = EXT4_SB(sb);
958 char * p;
959 substring_t args[MAX_OPT_ARGS];
960 int data_opt = 0;
961 int option;
962 #ifdef CONFIG_QUOTA
963 int qtype;
964 char *qname;
965 #endif
966
967 if (!options)
968 return 1;
969
970 while ((p = strsep (&options, ",")) != NULL) {
971 int token;
972 if (!*p)
973 continue;
974
975 token = match_token(p, tokens, args);
976 switch (token) {
977 case Opt_bsd_df:
978 clear_opt (sbi->s_mount_opt, MINIX_DF);
979 break;
980 case Opt_minix_df:
981 set_opt (sbi->s_mount_opt, MINIX_DF);
982 break;
983 case Opt_grpid:
984 set_opt (sbi->s_mount_opt, GRPID);
985 break;
986 case Opt_nogrpid:
987 clear_opt (sbi->s_mount_opt, GRPID);
988 break;
989 case Opt_resuid:
990 if (match_int(&args[0], &option))
991 return 0;
992 sbi->s_resuid = option;
993 break;
994 case Opt_resgid:
995 if (match_int(&args[0], &option))
996 return 0;
997 sbi->s_resgid = option;
998 break;
999 case Opt_sb:
1000 /* handled by get_sb_block() instead of here */
1001 /* *sb_block = match_int(&args[0]); */
1002 break;
1003 case Opt_err_panic:
1004 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
1005 clear_opt (sbi->s_mount_opt, ERRORS_RO);
1006 set_opt (sbi->s_mount_opt, ERRORS_PANIC);
1007 break;
1008 case Opt_err_ro:
1009 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
1010 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
1011 set_opt (sbi->s_mount_opt, ERRORS_RO);
1012 break;
1013 case Opt_err_cont:
1014 clear_opt (sbi->s_mount_opt, ERRORS_RO);
1015 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
1016 set_opt (sbi->s_mount_opt, ERRORS_CONT);
1017 break;
1018 case Opt_nouid32:
1019 set_opt (sbi->s_mount_opt, NO_UID32);
1020 break;
1021 case Opt_nocheck:
1022 clear_opt (sbi->s_mount_opt, CHECK);
1023 break;
1024 case Opt_debug:
1025 set_opt (sbi->s_mount_opt, DEBUG);
1026 break;
1027 case Opt_oldalloc:
1028 set_opt (sbi->s_mount_opt, OLDALLOC);
1029 break;
1030 case Opt_orlov:
1031 clear_opt (sbi->s_mount_opt, OLDALLOC);
1032 break;
1033 #ifdef CONFIG_EXT4DEV_FS_XATTR
1034 case Opt_user_xattr:
1035 set_opt (sbi->s_mount_opt, XATTR_USER);
1036 break;
1037 case Opt_nouser_xattr:
1038 clear_opt (sbi->s_mount_opt, XATTR_USER);
1039 break;
1040 #else
1041 case Opt_user_xattr:
1042 case Opt_nouser_xattr:
1043 printk("EXT4 (no)user_xattr options not supported\n");
1044 break;
1045 #endif
1046 #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
1047 case Opt_acl:
1048 set_opt(sbi->s_mount_opt, POSIX_ACL);
1049 break;
1050 case Opt_noacl:
1051 clear_opt(sbi->s_mount_opt, POSIX_ACL);
1052 break;
1053 #else
1054 case Opt_acl:
1055 case Opt_noacl:
1056 printk("EXT4 (no)acl options not supported\n");
1057 break;
1058 #endif
1059 case Opt_reservation:
1060 set_opt(sbi->s_mount_opt, RESERVATION);
1061 break;
1062 case Opt_noreservation:
1063 clear_opt(sbi->s_mount_opt, RESERVATION);
1064 break;
1065 case Opt_journal_update:
1066 /* @@@ FIXME */
1067 /* Eventually we will want to be able to create
1068 a journal file here. For now, only allow the
1069 user to specify an existing inode to be the
1070 journal file. */
1071 if (is_remount) {
1072 printk(KERN_ERR "EXT4-fs: cannot specify "
1073 "journal on remount\n");
1074 return 0;
1075 }
1076 set_opt (sbi->s_mount_opt, UPDATE_JOURNAL);
1077 break;
1078 case Opt_journal_inum:
1079 if (is_remount) {
1080 printk(KERN_ERR "EXT4-fs: cannot specify "
1081 "journal on remount\n");
1082 return 0;
1083 }
1084 if (match_int(&args[0], &option))
1085 return 0;
1086 *inum = option;
1087 break;
1088 case Opt_journal_dev:
1089 if (is_remount) {
1090 printk(KERN_ERR "EXT4-fs: cannot specify "
1091 "journal on remount\n");
1092 return 0;
1093 }
1094 if (match_int(&args[0], &option))
1095 return 0;
1096 *journal_devnum = option;
1097 break;
1098 case Opt_noload:
1099 set_opt (sbi->s_mount_opt, NOLOAD);
1100 break;
1101 case Opt_commit:
1102 if (match_int(&args[0], &option))
1103 return 0;
1104 if (option < 0)
1105 return 0;
1106 if (option == 0)
1107 option = JBD2_DEFAULT_MAX_COMMIT_AGE;
1108 sbi->s_commit_interval = HZ * option;
1109 break;
1110 case Opt_data_journal:
1111 data_opt = EXT4_MOUNT_JOURNAL_DATA;
1112 goto datacheck;
1113 case Opt_data_ordered:
1114 data_opt = EXT4_MOUNT_ORDERED_DATA;
1115 goto datacheck;
1116 case Opt_data_writeback:
1117 data_opt = EXT4_MOUNT_WRITEBACK_DATA;
1118 datacheck:
1119 if (is_remount) {
1120 if ((sbi->s_mount_opt & EXT4_MOUNT_DATA_FLAGS)
1121 != data_opt) {
1122 printk(KERN_ERR
1123 "EXT4-fs: cannot change data "
1124 "mode on remount\n");
1125 return 0;
1126 }
1127 } else {
1128 sbi->s_mount_opt &= ~EXT4_MOUNT_DATA_FLAGS;
1129 sbi->s_mount_opt |= data_opt;
1130 }
1131 break;
1132 #ifdef CONFIG_QUOTA
1133 case Opt_usrjquota:
1134 qtype = USRQUOTA;
1135 goto set_qf_name;
1136 case Opt_grpjquota:
1137 qtype = GRPQUOTA;
1138 set_qf_name:
1139 if (sb_any_quota_enabled(sb)) {
1140 printk(KERN_ERR
1141 "EXT4-fs: Cannot change journalled "
1142 "quota options when quota turned on.\n");
1143 return 0;
1144 }
1145 qname = match_strdup(&args[0]);
1146 if (!qname) {
1147 printk(KERN_ERR
1148 "EXT4-fs: not enough memory for "
1149 "storing quotafile name.\n");
1150 return 0;
1151 }
1152 if (sbi->s_qf_names[qtype] &&
1153 strcmp(sbi->s_qf_names[qtype], qname)) {
1154 printk(KERN_ERR
1155 "EXT4-fs: %s quota file already "
1156 "specified.\n", QTYPE2NAME(qtype));
1157 kfree(qname);
1158 return 0;
1159 }
1160 sbi->s_qf_names[qtype] = qname;
1161 if (strchr(sbi->s_qf_names[qtype], '/')) {
1162 printk(KERN_ERR
1163 "EXT4-fs: quotafile must be on "
1164 "filesystem root.\n");
1165 kfree(sbi->s_qf_names[qtype]);
1166 sbi->s_qf_names[qtype] = NULL;
1167 return 0;
1168 }
1169 set_opt(sbi->s_mount_opt, QUOTA);
1170 break;
1171 case Opt_offusrjquota:
1172 qtype = USRQUOTA;
1173 goto clear_qf_name;
1174 case Opt_offgrpjquota:
1175 qtype = GRPQUOTA;
1176 clear_qf_name:
1177 if (sb_any_quota_enabled(sb)) {
1178 printk(KERN_ERR "EXT4-fs: Cannot change "
1179 "journalled quota options when "
1180 "quota turned on.\n");
1181 return 0;
1182 }
1183 /*
1184 * The space will be released later when all options
1185 * are confirmed to be correct
1186 */
1187 sbi->s_qf_names[qtype] = NULL;
1188 break;
1189 case Opt_jqfmt_vfsold:
1190 sbi->s_jquota_fmt = QFMT_VFS_OLD;
1191 break;
1192 case Opt_jqfmt_vfsv0:
1193 sbi->s_jquota_fmt = QFMT_VFS_V0;
1194 break;
1195 case Opt_quota:
1196 case Opt_usrquota:
1197 set_opt(sbi->s_mount_opt, QUOTA);
1198 set_opt(sbi->s_mount_opt, USRQUOTA);
1199 break;
1200 case Opt_grpquota:
1201 set_opt(sbi->s_mount_opt, QUOTA);
1202 set_opt(sbi->s_mount_opt, GRPQUOTA);
1203 break;
1204 case Opt_noquota:
1205 if (sb_any_quota_enabled(sb)) {
1206 printk(KERN_ERR "EXT4-fs: Cannot change quota "
1207 "options when quota turned on.\n");
1208 return 0;
1209 }
1210 clear_opt(sbi->s_mount_opt, QUOTA);
1211 clear_opt(sbi->s_mount_opt, USRQUOTA);
1212 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1213 break;
1214 #else
1215 case Opt_quota:
1216 case Opt_usrquota:
1217 case Opt_grpquota:
1218 case Opt_usrjquota:
1219 case Opt_grpjquota:
1220 case Opt_offusrjquota:
1221 case Opt_offgrpjquota:
1222 case Opt_jqfmt_vfsold:
1223 case Opt_jqfmt_vfsv0:
1224 printk(KERN_ERR
1225 "EXT4-fs: journalled quota options not "
1226 "supported.\n");
1227 break;
1228 case Opt_noquota:
1229 break;
1230 #endif
1231 case Opt_abort:
1232 set_opt(sbi->s_mount_opt, ABORT);
1233 break;
1234 case Opt_barrier:
1235 if (match_int(&args[0], &option))
1236 return 0;
1237 if (option)
1238 set_opt(sbi->s_mount_opt, BARRIER);
1239 else
1240 clear_opt(sbi->s_mount_opt, BARRIER);
1241 break;
1242 case Opt_ignore:
1243 break;
1244 case Opt_resize:
1245 if (!is_remount) {
1246 printk("EXT4-fs: resize option only available "
1247 "for remount\n");
1248 return 0;
1249 }
1250 if (match_int(&args[0], &option) != 0)
1251 return 0;
1252 *n_blocks_count = option;
1253 break;
1254 case Opt_nobh:
1255 set_opt(sbi->s_mount_opt, NOBH);
1256 break;
1257 case Opt_bh:
1258 clear_opt(sbi->s_mount_opt, NOBH);
1259 break;
1260 case Opt_extents:
1261 set_opt (sbi->s_mount_opt, EXTENTS);
1262 break;
1263 case Opt_noextents:
1264 clear_opt (sbi->s_mount_opt, EXTENTS);
1265 break;
1266 default:
1267 printk (KERN_ERR
1268 "EXT4-fs: Unrecognized mount option \"%s\" "
1269 "or missing value\n", p);
1270 return 0;
1271 }
1272 }
1273 #ifdef CONFIG_QUOTA
1274 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1275 if ((sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA) &&
1276 sbi->s_qf_names[USRQUOTA])
1277 clear_opt(sbi->s_mount_opt, USRQUOTA);
1278
1279 if ((sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA) &&
1280 sbi->s_qf_names[GRPQUOTA])
1281 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1282
1283 if ((sbi->s_qf_names[USRQUOTA] &&
1284 (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)) ||
1285 (sbi->s_qf_names[GRPQUOTA] &&
1286 (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA))) {
1287 printk(KERN_ERR "EXT4-fs: old and new quota "
1288 "format mixing.\n");
1289 return 0;
1290 }
1291
1292 if (!sbi->s_jquota_fmt) {
1293 printk(KERN_ERR "EXT4-fs: journalled quota format "
1294 "not specified.\n");
1295 return 0;
1296 }
1297 } else {
1298 if (sbi->s_jquota_fmt) {
1299 printk(KERN_ERR "EXT4-fs: journalled quota format "
1300 "specified with no journalling "
1301 "enabled.\n");
1302 return 0;
1303 }
1304 }
1305 #endif
1306 return 1;
1307 }
1308
1309 static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
1310 int read_only)
1311 {
1312 struct ext4_sb_info *sbi = EXT4_SB(sb);
1313 int res = 0;
1314
1315 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
1316 printk (KERN_ERR "EXT4-fs warning: revision level too high, "
1317 "forcing read-only mode\n");
1318 res = MS_RDONLY;
1319 }
1320 if (read_only)
1321 return res;
1322 if (!(sbi->s_mount_state & EXT4_VALID_FS))
1323 printk (KERN_WARNING "EXT4-fs warning: mounting unchecked fs, "
1324 "running e2fsck is recommended\n");
1325 else if ((sbi->s_mount_state & EXT4_ERROR_FS))
1326 printk (KERN_WARNING
1327 "EXT4-fs warning: mounting fs with errors, "
1328 "running e2fsck is recommended\n");
1329 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
1330 le16_to_cpu(es->s_mnt_count) >=
1331 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
1332 printk (KERN_WARNING
1333 "EXT4-fs warning: maximal mount count reached, "
1334 "running e2fsck is recommended\n");
1335 else if (le32_to_cpu(es->s_checkinterval) &&
1336 (le32_to_cpu(es->s_lastcheck) +
1337 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1338 printk (KERN_WARNING
1339 "EXT4-fs warning: checktime reached, "
1340 "running e2fsck is recommended\n");
1341 #if 0
1342 /* @@@ We _will_ want to clear the valid bit if we find
1343 * inconsistencies, to force a fsck at reboot. But for
1344 * a plain journaled filesystem we can keep it set as
1345 * valid forever! :)
1346 */
1347 es->s_state = cpu_to_le16(le16_to_cpu(es->s_state) & ~EXT4_VALID_FS);
1348 #endif
1349 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
1350 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
1351 es->s_mnt_count=cpu_to_le16(le16_to_cpu(es->s_mnt_count) + 1);
1352 es->s_mtime = cpu_to_le32(get_seconds());
1353 ext4_update_dynamic_rev(sb);
1354 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
1355
1356 ext4_commit_super(sb, es, 1);
1357 if (test_opt(sb, DEBUG))
1358 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%lu, "
1359 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
1360 sb->s_blocksize,
1361 sbi->s_groups_count,
1362 EXT4_BLOCKS_PER_GROUP(sb),
1363 EXT4_INODES_PER_GROUP(sb),
1364 sbi->s_mount_opt);
1365
1366 printk(KERN_INFO "EXT4 FS on %s, ", sb->s_id);
1367 if (EXT4_SB(sb)->s_journal->j_inode == NULL) {
1368 char b[BDEVNAME_SIZE];
1369
1370 printk("external journal on %s\n",
1371 bdevname(EXT4_SB(sb)->s_journal->j_dev, b));
1372 } else {
1373 printk("internal journal\n");
1374 }
1375 return res;
1376 }
1377
1378 __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
1379 struct ext4_group_desc *gdp)
1380 {
1381 __u16 crc = 0;
1382
1383 if (sbi->s_es->s_feature_ro_compat &
1384 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) {
1385 int offset = offsetof(struct ext4_group_desc, bg_checksum);
1386 __le32 le_group = cpu_to_le32(block_group);
1387
1388 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
1389 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
1390 crc = crc16(crc, (__u8 *)gdp, offset);
1391 offset += sizeof(gdp->bg_checksum); /* skip checksum */
1392 /* for checksum of struct ext4_group_desc do the rest...*/
1393 if ((sbi->s_es->s_feature_incompat &
1394 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) &&
1395 offset < le16_to_cpu(sbi->s_es->s_desc_size))
1396 crc = crc16(crc, (__u8 *)gdp + offset,
1397 le16_to_cpu(sbi->s_es->s_desc_size) -
1398 offset);
1399 }
1400
1401 return cpu_to_le16(crc);
1402 }
1403
1404 int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 block_group,
1405 struct ext4_group_desc *gdp)
1406 {
1407 if ((sbi->s_es->s_feature_ro_compat &
1408 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) &&
1409 (gdp->bg_checksum != ext4_group_desc_csum(sbi, block_group, gdp)))
1410 return 0;
1411
1412 return 1;
1413 }
1414
1415 /* Called at mount-time, super-block is locked */
1416 static int ext4_check_descriptors (struct super_block * sb)
1417 {
1418 struct ext4_sb_info *sbi = EXT4_SB(sb);
1419 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
1420 ext4_fsblk_t last_block;
1421 ext4_fsblk_t block_bitmap;
1422 ext4_fsblk_t inode_bitmap;
1423 ext4_fsblk_t inode_table;
1424 struct ext4_group_desc * gdp = NULL;
1425 int desc_block = 0;
1426 int flexbg_flag = 0;
1427 ext4_group_t i;
1428
1429 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
1430 flexbg_flag = 1;
1431
1432 ext4_debug ("Checking group descriptors");
1433
1434 for (i = 0; i < sbi->s_groups_count; i++)
1435 {
1436 if (i == sbi->s_groups_count - 1 || flexbg_flag)
1437 last_block = ext4_blocks_count(sbi->s_es) - 1;
1438 else
1439 last_block = first_block +
1440 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
1441
1442 if ((i % EXT4_DESC_PER_BLOCK(sb)) == 0)
1443 gdp = (struct ext4_group_desc *)
1444 sbi->s_group_desc[desc_block++]->b_data;
1445 block_bitmap = ext4_block_bitmap(sb, gdp);
1446 if (block_bitmap < first_block || block_bitmap > last_block)
1447 {
1448 ext4_error (sb, "ext4_check_descriptors",
1449 "Block bitmap for group %lu"
1450 " not in group (block %llu)!",
1451 i, block_bitmap);
1452 return 0;
1453 }
1454 inode_bitmap = ext4_inode_bitmap(sb, gdp);
1455 if (inode_bitmap < first_block || inode_bitmap > last_block)
1456 {
1457 ext4_error (sb, "ext4_check_descriptors",
1458 "Inode bitmap for group %lu"
1459 " not in group (block %llu)!",
1460 i, inode_bitmap);
1461 return 0;
1462 }
1463 inode_table = ext4_inode_table(sb, gdp);
1464 if (inode_table < first_block ||
1465 inode_table + sbi->s_itb_per_group - 1 > last_block)
1466 {
1467 ext4_error (sb, "ext4_check_descriptors",
1468 "Inode table for group %lu"
1469 " not in group (block %llu)!",
1470 i, inode_table);
1471 return 0;
1472 }
1473 if (!ext4_group_desc_csum_verify(sbi, i, gdp)) {
1474 ext4_error(sb, __FUNCTION__,
1475 "Checksum for group %lu failed (%u!=%u)\n",
1476 i, le16_to_cpu(ext4_group_desc_csum(sbi, i,
1477 gdp)), le16_to_cpu(gdp->bg_checksum));
1478 return 0;
1479 }
1480 if (!flexbg_flag)
1481 first_block += EXT4_BLOCKS_PER_GROUP(sb);
1482 gdp = (struct ext4_group_desc *)
1483 ((__u8 *)gdp + EXT4_DESC_SIZE(sb));
1484 }
1485
1486 ext4_free_blocks_count_set(sbi->s_es, ext4_count_free_blocks(sb));
1487 sbi->s_es->s_free_inodes_count=cpu_to_le32(ext4_count_free_inodes(sb));
1488 return 1;
1489 }
1490
1491 /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
1492 * the superblock) which were deleted from all directories, but held open by
1493 * a process at the time of a crash. We walk the list and try to delete these
1494 * inodes at recovery time (only with a read-write filesystem).
1495 *
1496 * In order to keep the orphan inode chain consistent during traversal (in
1497 * case of crash during recovery), we link each inode into the superblock
1498 * orphan list_head and handle it the same way as an inode deletion during
1499 * normal operation (which journals the operations for us).
1500 *
1501 * We only do an iget() and an iput() on each inode, which is very safe if we
1502 * accidentally point at an in-use or already deleted inode. The worst that
1503 * can happen in this case is that we get a "bit already cleared" message from
1504 * ext4_free_inode(). The only reason we would point at a wrong inode is if
1505 * e2fsck was run on this filesystem, and it must have already done the orphan
1506 * inode cleanup for us, so we can safely abort without any further action.
1507 */
1508 static void ext4_orphan_cleanup (struct super_block * sb,
1509 struct ext4_super_block * es)
1510 {
1511 unsigned int s_flags = sb->s_flags;
1512 int nr_orphans = 0, nr_truncates = 0;
1513 #ifdef CONFIG_QUOTA
1514 int i;
1515 #endif
1516 if (!es->s_last_orphan) {
1517 jbd_debug(4, "no orphan inodes to clean up\n");
1518 return;
1519 }
1520
1521 if (bdev_read_only(sb->s_bdev)) {
1522 printk(KERN_ERR "EXT4-fs: write access "
1523 "unavailable, skipping orphan cleanup.\n");
1524 return;
1525 }
1526
1527 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
1528 if (es->s_last_orphan)
1529 jbd_debug(1, "Errors on filesystem, "
1530 "clearing orphan list.\n");
1531 es->s_last_orphan = 0;
1532 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1533 return;
1534 }
1535
1536 if (s_flags & MS_RDONLY) {
1537 printk(KERN_INFO "EXT4-fs: %s: orphan cleanup on readonly fs\n",
1538 sb->s_id);
1539 sb->s_flags &= ~MS_RDONLY;
1540 }
1541 #ifdef CONFIG_QUOTA
1542 /* Needed for iput() to work correctly and not trash data */
1543 sb->s_flags |= MS_ACTIVE;
1544 /* Turn on quotas so that they are updated correctly */
1545 for (i = 0; i < MAXQUOTAS; i++) {
1546 if (EXT4_SB(sb)->s_qf_names[i]) {
1547 int ret = ext4_quota_on_mount(sb, i);
1548 if (ret < 0)
1549 printk(KERN_ERR
1550 "EXT4-fs: Cannot turn on journalled "
1551 "quota: error %d\n", ret);
1552 }
1553 }
1554 #endif
1555
1556 while (es->s_last_orphan) {
1557 struct inode *inode;
1558
1559 if (!(inode =
1560 ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan)))) {
1561 es->s_last_orphan = 0;
1562 break;
1563 }
1564
1565 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
1566 DQUOT_INIT(inode);
1567 if (inode->i_nlink) {
1568 printk(KERN_DEBUG
1569 "%s: truncating inode %lu to %Ld bytes\n",
1570 __FUNCTION__, inode->i_ino, inode->i_size);
1571 jbd_debug(2, "truncating inode %lu to %Ld bytes\n",
1572 inode->i_ino, inode->i_size);
1573 ext4_truncate(inode);
1574 nr_truncates++;
1575 } else {
1576 printk(KERN_DEBUG
1577 "%s: deleting unreferenced inode %lu\n",
1578 __FUNCTION__, inode->i_ino);
1579 jbd_debug(2, "deleting unreferenced inode %lu\n",
1580 inode->i_ino);
1581 nr_orphans++;
1582 }
1583 iput(inode); /* The delete magic happens here! */
1584 }
1585
1586 #define PLURAL(x) (x), ((x)==1) ? "" : "s"
1587
1588 if (nr_orphans)
1589 printk(KERN_INFO "EXT4-fs: %s: %d orphan inode%s deleted\n",
1590 sb->s_id, PLURAL(nr_orphans));
1591 if (nr_truncates)
1592 printk(KERN_INFO "EXT4-fs: %s: %d truncate%s cleaned up\n",
1593 sb->s_id, PLURAL(nr_truncates));
1594 #ifdef CONFIG_QUOTA
1595 /* Turn quotas off */
1596 for (i = 0; i < MAXQUOTAS; i++) {
1597 if (sb_dqopt(sb)->files[i])
1598 vfs_quota_off(sb, i);
1599 }
1600 #endif
1601 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1602 }
1603 /*
1604 * Maximal extent format file size.
1605 * Resulting logical blkno at s_maxbytes must fit in our on-disk
1606 * extent format containers, within a sector_t, and within i_blocks
1607 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
1608 * so that won't be a limiting factor.
1609 *
1610 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
1611 */
1612 static loff_t ext4_max_size(int blkbits)
1613 {
1614 loff_t res;
1615 loff_t upper_limit = MAX_LFS_FILESIZE;
1616
1617 /* small i_blocks in vfs inode? */
1618 if (sizeof(blkcnt_t) < sizeof(u64)) {
1619 /*
1620 * CONFIG_LSF is not enabled implies the inode
1621 * i_block represent total blocks in 512 bytes
1622 * 32 == size of vfs inode i_blocks * 8
1623 */
1624 upper_limit = (1LL << 32) - 1;
1625
1626 /* total blocks in file system block size */
1627 upper_limit >>= (blkbits - 9);
1628 upper_limit <<= blkbits;
1629 }
1630
1631 /* 32-bit extent-start container, ee_block */
1632 res = 1LL << 32;
1633 res <<= blkbits;
1634 res -= 1;
1635
1636 /* Sanity check against vm- & vfs- imposed limits */
1637 if (res > upper_limit)
1638 res = upper_limit;
1639
1640 return res;
1641 }
1642
1643 /*
1644 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
1645 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
1646 * We need to be 1 filesystem block less than the 2^48 sector limit.
1647 */
1648 static loff_t ext4_max_bitmap_size(int bits)
1649 {
1650 loff_t res = EXT4_NDIR_BLOCKS;
1651 int meta_blocks;
1652 loff_t upper_limit;
1653 /* This is calculated to be the largest file size for a
1654 * dense, bitmapped file such that the total number of
1655 * sectors in the file, including data and all indirect blocks,
1656 * does not exceed 2^48 -1
1657 * __u32 i_blocks_lo and _u16 i_blocks_high representing the
1658 * total number of 512 bytes blocks of the file
1659 */
1660
1661 if (sizeof(blkcnt_t) < sizeof(u64)) {
1662 /*
1663 * CONFIG_LSF is not enabled implies the inode
1664 * i_block represent total blocks in 512 bytes
1665 * 32 == size of vfs inode i_blocks * 8
1666 */
1667 upper_limit = (1LL << 32) - 1;
1668
1669 /* total blocks in file system block size */
1670 upper_limit >>= (bits - 9);
1671
1672 } else {
1673 /*
1674 * We use 48 bit ext4_inode i_blocks
1675 * With EXT4_HUGE_FILE_FL set the i_blocks
1676 * represent total number of blocks in
1677 * file system block size
1678 */
1679 upper_limit = (1LL << 48) - 1;
1680
1681 }
1682
1683 /* indirect blocks */
1684 meta_blocks = 1;
1685 /* double indirect blocks */
1686 meta_blocks += 1 + (1LL << (bits-2));
1687 /* tripple indirect blocks */
1688 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
1689
1690 upper_limit -= meta_blocks;
1691 upper_limit <<= bits;
1692
1693 res += 1LL << (bits-2);
1694 res += 1LL << (2*(bits-2));
1695 res += 1LL << (3*(bits-2));
1696 res <<= bits;
1697 if (res > upper_limit)
1698 res = upper_limit;
1699
1700 if (res > MAX_LFS_FILESIZE)
1701 res = MAX_LFS_FILESIZE;
1702
1703 return res;
1704 }
1705
1706 static ext4_fsblk_t descriptor_loc(struct super_block *sb,
1707 ext4_fsblk_t logical_sb_block, int nr)
1708 {
1709 struct ext4_sb_info *sbi = EXT4_SB(sb);
1710 ext4_group_t bg, first_meta_bg;
1711 int has_super = 0;
1712
1713 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1714
1715 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
1716 nr < first_meta_bg)
1717 return logical_sb_block + nr + 1;
1718 bg = sbi->s_desc_per_block * nr;
1719 if (ext4_bg_has_super(sb, bg))
1720 has_super = 1;
1721 return (has_super + ext4_group_first_block_no(sb, bg));
1722 }
1723
1724
1725 static int ext4_fill_super (struct super_block *sb, void *data, int silent)
1726 __releases(kernel_sem)
1727 __acquires(kernel_sem)
1728
1729 {
1730 struct buffer_head * bh;
1731 struct ext4_super_block *es = NULL;
1732 struct ext4_sb_info *sbi;
1733 ext4_fsblk_t block;
1734 ext4_fsblk_t sb_block = get_sb_block(&data);
1735 ext4_fsblk_t logical_sb_block;
1736 unsigned long offset = 0;
1737 unsigned int journal_inum = 0;
1738 unsigned long journal_devnum = 0;
1739 unsigned long def_mount_opts;
1740 struct inode *root;
1741 int blocksize;
1742 int hblock;
1743 int db_count;
1744 int i;
1745 int needs_recovery;
1746 __le32 features;
1747 __u64 blocks_count;
1748 int err;
1749
1750 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
1751 if (!sbi)
1752 return -ENOMEM;
1753 sb->s_fs_info = sbi;
1754 sbi->s_mount_opt = 0;
1755 sbi->s_resuid = EXT4_DEF_RESUID;
1756 sbi->s_resgid = EXT4_DEF_RESGID;
1757 sbi->s_sb_block = sb_block;
1758
1759 unlock_kernel();
1760
1761 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
1762 if (!blocksize) {
1763 printk(KERN_ERR "EXT4-fs: unable to set blocksize\n");
1764 goto out_fail;
1765 }
1766
1767 if (!sb_set_blocksize(sb, blocksize)) {
1768 printk(KERN_ERR "EXT4-fs: bad blocksize %d.\n", blocksize);
1769 goto out_fail;
1770 }
1771
1772 /*
1773 * The ext4 superblock will not be buffer aligned for other than 1kB
1774 * block sizes. We need to calculate the offset from buffer start.
1775 */
1776 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
1777 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
1778 offset = do_div(logical_sb_block, blocksize);
1779 } else {
1780 logical_sb_block = sb_block;
1781 }
1782
1783 if (!(bh = sb_bread(sb, logical_sb_block))) {
1784 printk (KERN_ERR "EXT4-fs: unable to read superblock\n");
1785 goto out_fail;
1786 }
1787 /*
1788 * Note: s_es must be initialized as soon as possible because
1789 * some ext4 macro-instructions depend on its value
1790 */
1791 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
1792 sbi->s_es = es;
1793 sb->s_magic = le16_to_cpu(es->s_magic);
1794 if (sb->s_magic != EXT4_SUPER_MAGIC)
1795 goto cantfind_ext4;
1796
1797 /* Set defaults before we parse the mount options */
1798 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
1799 if (def_mount_opts & EXT4_DEFM_DEBUG)
1800 set_opt(sbi->s_mount_opt, DEBUG);
1801 if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
1802 set_opt(sbi->s_mount_opt, GRPID);
1803 if (def_mount_opts & EXT4_DEFM_UID16)
1804 set_opt(sbi->s_mount_opt, NO_UID32);
1805 #ifdef CONFIG_EXT4DEV_FS_XATTR
1806 if (def_mount_opts & EXT4_DEFM_XATTR_USER)
1807 set_opt(sbi->s_mount_opt, XATTR_USER);
1808 #endif
1809 #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
1810 if (def_mount_opts & EXT4_DEFM_ACL)
1811 set_opt(sbi->s_mount_opt, POSIX_ACL);
1812 #endif
1813 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
1814 sbi->s_mount_opt |= EXT4_MOUNT_JOURNAL_DATA;
1815 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
1816 sbi->s_mount_opt |= EXT4_MOUNT_ORDERED_DATA;
1817 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
1818 sbi->s_mount_opt |= EXT4_MOUNT_WRITEBACK_DATA;
1819
1820 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
1821 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1822 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_RO)
1823 set_opt(sbi->s_mount_opt, ERRORS_RO);
1824 else
1825 set_opt(sbi->s_mount_opt, ERRORS_CONT);
1826
1827 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
1828 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
1829
1830 set_opt(sbi->s_mount_opt, RESERVATION);
1831
1832 /*
1833 * turn on extents feature by default in ext4 filesystem
1834 * User -o noextents to turn it off
1835 */
1836 set_opt(sbi->s_mount_opt, EXTENTS);
1837
1838 if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
1839 NULL, 0))
1840 goto failed_mount;
1841
1842 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1843 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
1844
1845 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
1846 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
1847 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
1848 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
1849 printk(KERN_WARNING
1850 "EXT4-fs warning: feature flags set on rev 0 fs, "
1851 "running e2fsck is recommended\n");
1852 /*
1853 * Check feature flags regardless of the revision level, since we
1854 * previously didn't change the revision level when setting the flags,
1855 * so there is a chance incompat flags are set on a rev 0 filesystem.
1856 */
1857 features = EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP);
1858 if (features) {
1859 printk(KERN_ERR "EXT4-fs: %s: couldn't mount because of "
1860 "unsupported optional features (%x).\n",
1861 sb->s_id, le32_to_cpu(features));
1862 goto failed_mount;
1863 }
1864 features = EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP);
1865 if (!(sb->s_flags & MS_RDONLY) && features) {
1866 printk(KERN_ERR "EXT4-fs: %s: couldn't mount RDWR because of "
1867 "unsupported optional features (%x).\n",
1868 sb->s_id, le32_to_cpu(features));
1869 goto failed_mount;
1870 }
1871 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) {
1872 /*
1873 * Large file size enabled file system can only be
1874 * mount if kernel is build with CONFIG_LSF
1875 */
1876 if (sizeof(root->i_blocks) < sizeof(u64) &&
1877 !(sb->s_flags & MS_RDONLY)) {
1878 printk(KERN_ERR "EXT4-fs: %s: Filesystem with huge "
1879 "files cannot be mounted read-write "
1880 "without CONFIG_LSF.\n", sb->s_id);
1881 goto failed_mount;
1882 }
1883 }
1884 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
1885
1886 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
1887 blocksize > EXT4_MAX_BLOCK_SIZE) {
1888 printk(KERN_ERR
1889 "EXT4-fs: Unsupported filesystem blocksize %d on %s.\n",
1890 blocksize, sb->s_id);
1891 goto failed_mount;
1892 }
1893
1894 hblock = bdev_hardsect_size(sb->s_bdev);
1895 if (sb->s_blocksize != blocksize) {
1896 /*
1897 * Make sure the blocksize for the filesystem is larger
1898 * than the hardware sectorsize for the machine.
1899 */
1900 if (blocksize < hblock) {
1901 printk(KERN_ERR "EXT4-fs: blocksize %d too small for "
1902 "device blocksize %d.\n", blocksize, hblock);
1903 goto failed_mount;
1904 }
1905
1906 brelse (bh);
1907 sb_set_blocksize(sb, blocksize);
1908 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
1909 offset = do_div(logical_sb_block, blocksize);
1910 bh = sb_bread(sb, logical_sb_block);
1911 if (!bh) {
1912 printk(KERN_ERR
1913 "EXT4-fs: Can't read superblock on 2nd try.\n");
1914 goto failed_mount;
1915 }
1916 es = (struct ext4_super_block *)(((char *)bh->b_data) + offset);
1917 sbi->s_es = es;
1918 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
1919 printk (KERN_ERR
1920 "EXT4-fs: Magic mismatch, very weird !\n");
1921 goto failed_mount;
1922 }
1923 }
1924
1925 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits);
1926 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits);
1927
1928 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
1929 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
1930 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
1931 } else {
1932 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
1933 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
1934 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
1935 (!is_power_of_2(sbi->s_inode_size)) ||
1936 (sbi->s_inode_size > blocksize)) {
1937 printk (KERN_ERR
1938 "EXT4-fs: unsupported inode size: %d\n",
1939 sbi->s_inode_size);
1940 goto failed_mount;
1941 }
1942 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
1943 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
1944 }
1945 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
1946 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
1947 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
1948 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
1949 !is_power_of_2(sbi->s_desc_size)) {
1950 printk(KERN_ERR
1951 "EXT4-fs: unsupported descriptor size %lu\n",
1952 sbi->s_desc_size);
1953 goto failed_mount;
1954 }
1955 } else
1956 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
1957 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
1958 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
1959 if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
1960 goto cantfind_ext4;
1961 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
1962 if (sbi->s_inodes_per_block == 0)
1963 goto cantfind_ext4;
1964 sbi->s_itb_per_group = sbi->s_inodes_per_group /
1965 sbi->s_inodes_per_block;
1966 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
1967 sbi->s_sbh = bh;
1968 sbi->s_mount_state = le16_to_cpu(es->s_state);
1969 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
1970 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
1971 for (i=0; i < 4; i++)
1972 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
1973 sbi->s_def_hash_version = es->s_def_hash_version;
1974
1975 if (sbi->s_blocks_per_group > blocksize * 8) {
1976 printk (KERN_ERR
1977 "EXT4-fs: #blocks per group too big: %lu\n",
1978 sbi->s_blocks_per_group);
1979 goto failed_mount;
1980 }
1981 if (sbi->s_inodes_per_group > blocksize * 8) {
1982 printk (KERN_ERR
1983 "EXT4-fs: #inodes per group too big: %lu\n",
1984 sbi->s_inodes_per_group);
1985 goto failed_mount;
1986 }
1987
1988 if (ext4_blocks_count(es) >
1989 (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) {
1990 printk(KERN_ERR "EXT4-fs: filesystem on %s:"
1991 " too large to mount safely\n", sb->s_id);
1992 if (sizeof(sector_t) < 8)
1993 printk(KERN_WARNING "EXT4-fs: CONFIG_LBD not "
1994 "enabled\n");
1995 goto failed_mount;
1996 }
1997
1998 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
1999 goto cantfind_ext4;
2000
2001 /* ensure blocks_count calculation below doesn't sign-extend */
2002 if (ext4_blocks_count(es) + EXT4_BLOCKS_PER_GROUP(sb) <
2003 le32_to_cpu(es->s_first_data_block) + 1) {
2004 printk(KERN_WARNING "EXT4-fs: bad geometry: block count %llu, "
2005 "first data block %u, blocks per group %lu\n",
2006 ext4_blocks_count(es),
2007 le32_to_cpu(es->s_first_data_block),
2008 EXT4_BLOCKS_PER_GROUP(sb));
2009 goto failed_mount;
2010 }
2011 blocks_count = (ext4_blocks_count(es) -
2012 le32_to_cpu(es->s_first_data_block) +
2013 EXT4_BLOCKS_PER_GROUP(sb) - 1);
2014 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
2015 sbi->s_groups_count = blocks_count;
2016 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
2017 EXT4_DESC_PER_BLOCK(sb);
2018 sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
2019 GFP_KERNEL);
2020 if (sbi->s_group_desc == NULL) {
2021 printk (KERN_ERR "EXT4-fs: not enough memory\n");
2022 goto failed_mount;
2023 }
2024
2025 bgl_lock_init(&sbi->s_blockgroup_lock);
2026
2027 for (i = 0; i < db_count; i++) {
2028 block = descriptor_loc(sb, logical_sb_block, i);
2029 sbi->s_group_desc[i] = sb_bread(sb, block);
2030 if (!sbi->s_group_desc[i]) {
2031 printk (KERN_ERR "EXT4-fs: "
2032 "can't read group descriptor %d\n", i);
2033 db_count = i;
2034 goto failed_mount2;
2035 }
2036 }
2037 if (!ext4_check_descriptors (sb)) {
2038 printk(KERN_ERR "EXT4-fs: group descriptors corrupted!\n");
2039 goto failed_mount2;
2040 }
2041 sbi->s_gdb_count = db_count;
2042 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
2043 spin_lock_init(&sbi->s_next_gen_lock);
2044
2045 err = percpu_counter_init(&sbi->s_freeblocks_counter,
2046 ext4_count_free_blocks(sb));
2047 if (!err) {
2048 err = percpu_counter_init(&sbi->s_freeinodes_counter,
2049 ext4_count_free_inodes(sb));
2050 }
2051 if (!err) {
2052 err = percpu_counter_init(&sbi->s_dirs_counter,
2053 ext4_count_dirs(sb));
2054 }
2055 if (err) {
2056 printk(KERN_ERR "EXT4-fs: insufficient memory\n");
2057 goto failed_mount3;
2058 }
2059
2060 /* per fileystem reservation list head & lock */
2061 spin_lock_init(&sbi->s_rsv_window_lock);
2062 sbi->s_rsv_window_root = RB_ROOT;
2063 /* Add a single, static dummy reservation to the start of the
2064 * reservation window list --- it gives us a placeholder for
2065 * append-at-start-of-list which makes the allocation logic
2066 * _much_ simpler. */
2067 sbi->s_rsv_window_head.rsv_start = EXT4_RESERVE_WINDOW_NOT_ALLOCATED;
2068 sbi->s_rsv_window_head.rsv_end = EXT4_RESERVE_WINDOW_NOT_ALLOCATED;
2069 sbi->s_rsv_window_head.rsv_alloc_hit = 0;
2070 sbi->s_rsv_window_head.rsv_goal_size = 0;
2071 ext4_rsv_window_add(sb, &sbi->s_rsv_window_head);
2072
2073 /*
2074 * set up enough so that it can read an inode
2075 */
2076 sb->s_op = &ext4_sops;
2077 sb->s_export_op = &ext4_export_ops;
2078 sb->s_xattr = ext4_xattr_handlers;
2079 #ifdef CONFIG_QUOTA
2080 sb->s_qcop = &ext4_qctl_operations;
2081 sb->dq_op = &ext4_quota_operations;
2082 #endif
2083 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
2084
2085 sb->s_root = NULL;
2086
2087 needs_recovery = (es->s_last_orphan != 0 ||
2088 EXT4_HAS_INCOMPAT_FEATURE(sb,
2089 EXT4_FEATURE_INCOMPAT_RECOVER));
2090
2091 /*
2092 * The first inode we look at is the journal inode. Don't try
2093 * root first: it may be modified in the journal!
2094 */
2095 if (!test_opt(sb, NOLOAD) &&
2096 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
2097 if (ext4_load_journal(sb, es, journal_devnum))
2098 goto failed_mount3;
2099 } else if (journal_inum) {
2100 if (ext4_create_journal(sb, es, journal_inum))
2101 goto failed_mount3;
2102 } else {
2103 if (!silent)
2104 printk (KERN_ERR
2105 "ext4: No journal on filesystem on %s\n",
2106 sb->s_id);
2107 goto failed_mount3;
2108 }
2109
2110 if (ext4_blocks_count(es) > 0xffffffffULL &&
2111 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
2112 JBD2_FEATURE_INCOMPAT_64BIT)) {
2113 printk(KERN_ERR "ext4: Failed to set 64-bit journal feature\n");
2114 goto failed_mount4;
2115 }
2116
2117 /* We have now updated the journal if required, so we can
2118 * validate the data journaling mode. */
2119 switch (test_opt(sb, DATA_FLAGS)) {
2120 case 0:
2121 /* No mode set, assume a default based on the journal
2122 * capabilities: ORDERED_DATA if the journal can
2123 * cope, else JOURNAL_DATA
2124 */
2125 if (jbd2_journal_check_available_features
2126 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
2127 set_opt(sbi->s_mount_opt, ORDERED_DATA);
2128 else
2129 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
2130 break;
2131
2132 case EXT4_MOUNT_ORDERED_DATA:
2133 case EXT4_MOUNT_WRITEBACK_DATA:
2134 if (!jbd2_journal_check_available_features
2135 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
2136 printk(KERN_ERR "EXT4-fs: Journal does not support "
2137 "requested data journaling mode\n");
2138 goto failed_mount4;
2139 }
2140 default:
2141 break;
2142 }
2143
2144 if (test_opt(sb, NOBH)) {
2145 if (!(test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)) {
2146 printk(KERN_WARNING "EXT4-fs: Ignoring nobh option - "
2147 "its supported only with writeback mode\n");
2148 clear_opt(sbi->s_mount_opt, NOBH);
2149 }
2150 }
2151 /*
2152 * The jbd2_journal_load will have done any necessary log recovery,
2153 * so we can safely mount the rest of the filesystem now.
2154 */
2155
2156 root = iget(sb, EXT4_ROOT_INO);
2157 sb->s_root = d_alloc_root(root);
2158 if (!sb->s_root) {
2159 printk(KERN_ERR "EXT4-fs: get root inode failed\n");
2160 iput(root);
2161 goto failed_mount4;
2162 }
2163 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
2164 dput(sb->s_root);
2165 sb->s_root = NULL;
2166 printk(KERN_ERR "EXT4-fs: corrupt root inode, run e2fsck\n");
2167 goto failed_mount4;
2168 }
2169
2170 ext4_setup_super (sb, es, sb->s_flags & MS_RDONLY);
2171
2172 /* determine the minimum size of new large inodes, if present */
2173 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
2174 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
2175 EXT4_GOOD_OLD_INODE_SIZE;
2176 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
2177 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) {
2178 if (sbi->s_want_extra_isize <
2179 le16_to_cpu(es->s_want_extra_isize))
2180 sbi->s_want_extra_isize =
2181 le16_to_cpu(es->s_want_extra_isize);
2182 if (sbi->s_want_extra_isize <
2183 le16_to_cpu(es->s_min_extra_isize))
2184 sbi->s_want_extra_isize =
2185 le16_to_cpu(es->s_min_extra_isize);
2186 }
2187 }
2188 /* Check if enough inode space is available */
2189 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
2190 sbi->s_inode_size) {
2191 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
2192 EXT4_GOOD_OLD_INODE_SIZE;
2193 printk(KERN_INFO "EXT4-fs: required extra inode space not"
2194 "available.\n");
2195 }
2196
2197 /*
2198 * akpm: core read_super() calls in here with the superblock locked.
2199 * That deadlocks, because orphan cleanup needs to lock the superblock
2200 * in numerous places. Here we just pop the lock - it's relatively
2201 * harmless, because we are now ready to accept write_super() requests,
2202 * and aviro says that's the only reason for hanging onto the
2203 * superblock lock.
2204 */
2205 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
2206 ext4_orphan_cleanup(sb, es);
2207 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
2208 if (needs_recovery)
2209 printk (KERN_INFO "EXT4-fs: recovery complete.\n");
2210 ext4_mark_recovery_complete(sb, es);
2211 printk (KERN_INFO "EXT4-fs: mounted filesystem with %s data mode.\n",
2212 test_opt(sb,DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA ? "journal":
2213 test_opt(sb,DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA ? "ordered":
2214 "writeback");
2215
2216 ext4_ext_init(sb);
2217
2218 lock_kernel();
2219 return 0;
2220
2221 cantfind_ext4:
2222 if (!silent)
2223 printk(KERN_ERR "VFS: Can't find ext4 filesystem on dev %s.\n",
2224 sb->s_id);
2225 goto failed_mount;
2226
2227 failed_mount4:
2228 jbd2_journal_destroy(sbi->s_journal);
2229 failed_mount3:
2230 percpu_counter_destroy(&sbi->s_freeblocks_counter);
2231 percpu_counter_destroy(&sbi->s_freeinodes_counter);
2232 percpu_counter_destroy(&sbi->s_dirs_counter);
2233 failed_mount2:
2234 for (i = 0; i < db_count; i++)
2235 brelse(sbi->s_group_desc[i]);
2236 kfree(sbi->s_group_desc);
2237 failed_mount:
2238 #ifdef CONFIG_QUOTA
2239 for (i = 0; i < MAXQUOTAS; i++)
2240 kfree(sbi->s_qf_names[i]);
2241 #endif
2242 ext4_blkdev_remove(sbi);
2243 brelse(bh);
2244 out_fail:
2245 sb->s_fs_info = NULL;
2246 kfree(sbi);
2247 lock_kernel();
2248 return -EINVAL;
2249 }
2250
2251 /*
2252 * Setup any per-fs journal parameters now. We'll do this both on
2253 * initial mount, once the journal has been initialised but before we've
2254 * done any recovery; and again on any subsequent remount.
2255 */
2256 static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
2257 {
2258 struct ext4_sb_info *sbi = EXT4_SB(sb);
2259
2260 if (sbi->s_commit_interval)
2261 journal->j_commit_interval = sbi->s_commit_interval;
2262 /* We could also set up an ext4-specific default for the commit
2263 * interval here, but for now we'll just fall back to the jbd
2264 * default. */
2265
2266 spin_lock(&journal->j_state_lock);
2267 if (test_opt(sb, BARRIER))
2268 journal->j_flags |= JBD2_BARRIER;
2269 else
2270 journal->j_flags &= ~JBD2_BARRIER;
2271 spin_unlock(&journal->j_state_lock);
2272 }
2273
2274 static journal_t *ext4_get_journal(struct super_block *sb,
2275 unsigned int journal_inum)
2276 {
2277 struct inode *journal_inode;
2278 journal_t *journal;
2279
2280 /* First, test for the existence of a valid inode on disk. Bad
2281 * things happen if we iget() an unused inode, as the subsequent
2282 * iput() will try to delete it. */
2283
2284 journal_inode = iget(sb, journal_inum);
2285 if (!journal_inode) {
2286 printk(KERN_ERR "EXT4-fs: no journal found.\n");
2287 return NULL;
2288 }
2289 if (!journal_inode->i_nlink) {
2290 make_bad_inode(journal_inode);
2291 iput(journal_inode);
2292 printk(KERN_ERR "EXT4-fs: journal inode is deleted.\n");
2293 return NULL;
2294 }
2295
2296 jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
2297 journal_inode, journal_inode->i_size);
2298 if (is_bad_inode(journal_inode) || !S_ISREG(journal_inode->i_mode)) {
2299 printk(KERN_ERR "EXT4-fs: invalid journal inode.\n");
2300 iput(journal_inode);
2301 return NULL;
2302 }
2303
2304 journal = jbd2_journal_init_inode(journal_inode);
2305 if (!journal) {
2306 printk(KERN_ERR "EXT4-fs: Could not load journal inode\n");
2307 iput(journal_inode);
2308 return NULL;
2309 }
2310 journal->j_private = sb;
2311 ext4_init_journal_params(sb, journal);
2312 return journal;
2313 }
2314
2315 static journal_t *ext4_get_dev_journal(struct super_block *sb,
2316 dev_t j_dev)
2317 {
2318 struct buffer_head * bh;
2319 journal_t *journal;
2320 ext4_fsblk_t start;
2321 ext4_fsblk_t len;
2322 int hblock, blocksize;
2323 ext4_fsblk_t sb_block;
2324 unsigned long offset;
2325 struct ext4_super_block * es;
2326 struct block_device *bdev;
2327
2328 bdev = ext4_blkdev_get(j_dev);
2329 if (bdev == NULL)
2330 return NULL;
2331
2332 if (bd_claim(bdev, sb)) {
2333 printk(KERN_ERR
2334 "EXT4: failed to claim external journal device.\n");
2335 blkdev_put(bdev);
2336 return NULL;
2337 }
2338
2339 blocksize = sb->s_blocksize;
2340 hblock = bdev_hardsect_size(bdev);
2341 if (blocksize < hblock) {
2342 printk(KERN_ERR
2343 "EXT4-fs: blocksize too small for journal device.\n");
2344 goto out_bdev;
2345 }
2346
2347 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
2348 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
2349 set_blocksize(bdev, blocksize);
2350 if (!(bh = __bread(bdev, sb_block, blocksize))) {
2351 printk(KERN_ERR "EXT4-fs: couldn't read superblock of "
2352 "external journal\n");
2353 goto out_bdev;
2354 }
2355
2356 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
2357 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
2358 !(le32_to_cpu(es->s_feature_incompat) &
2359 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
2360 printk(KERN_ERR "EXT4-fs: external journal has "
2361 "bad superblock\n");
2362 brelse(bh);
2363 goto out_bdev;
2364 }
2365
2366 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
2367 printk(KERN_ERR "EXT4-fs: journal UUID does not match\n");
2368 brelse(bh);
2369 goto out_bdev;
2370 }
2371
2372 len = ext4_blocks_count(es);
2373 start = sb_block + 1;
2374 brelse(bh); /* we're done with the superblock */
2375
2376 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
2377 start, len, blocksize);
2378 if (!journal) {
2379 printk(KERN_ERR "EXT4-fs: failed to create device journal\n");
2380 goto out_bdev;
2381 }
2382 journal->j_private = sb;
2383 ll_rw_block(READ, 1, &journal->j_sb_buffer);
2384 wait_on_buffer(journal->j_sb_buffer);
2385 if (!buffer_uptodate(journal->j_sb_buffer)) {
2386 printk(KERN_ERR "EXT4-fs: I/O error on journal device\n");
2387 goto out_journal;
2388 }
2389 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
2390 printk(KERN_ERR "EXT4-fs: External journal has more than one "
2391 "user (unsupported) - %d\n",
2392 be32_to_cpu(journal->j_superblock->s_nr_users));
2393 goto out_journal;
2394 }
2395 EXT4_SB(sb)->journal_bdev = bdev;
2396 ext4_init_journal_params(sb, journal);
2397 return journal;
2398 out_journal:
2399 jbd2_journal_destroy(journal);
2400 out_bdev:
2401 ext4_blkdev_put(bdev);
2402 return NULL;
2403 }
2404
2405 static int ext4_load_journal(struct super_block *sb,
2406 struct ext4_super_block *es,
2407 unsigned long journal_devnum)
2408 {
2409 journal_t *journal;
2410 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
2411 dev_t journal_dev;
2412 int err = 0;
2413 int really_read_only;
2414
2415 if (journal_devnum &&
2416 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2417 printk(KERN_INFO "EXT4-fs: external journal device major/minor "
2418 "numbers have changed\n");
2419 journal_dev = new_decode_dev(journal_devnum);
2420 } else
2421 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
2422
2423 really_read_only = bdev_read_only(sb->s_bdev);
2424
2425 /*
2426 * Are we loading a blank journal or performing recovery after a
2427 * crash? For recovery, we need to check in advance whether we
2428 * can get read-write access to the device.
2429 */
2430
2431 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
2432 if (sb->s_flags & MS_RDONLY) {
2433 printk(KERN_INFO "EXT4-fs: INFO: recovery "
2434 "required on readonly filesystem.\n");
2435 if (really_read_only) {
2436 printk(KERN_ERR "EXT4-fs: write access "
2437 "unavailable, cannot proceed.\n");
2438 return -EROFS;
2439 }
2440 printk (KERN_INFO "EXT4-fs: write access will "
2441 "be enabled during recovery.\n");
2442 }
2443 }
2444
2445 if (journal_inum && journal_dev) {
2446 printk(KERN_ERR "EXT4-fs: filesystem has both journal "
2447 "and inode journals!\n");
2448 return -EINVAL;
2449 }
2450
2451 if (journal_inum) {
2452 if (!(journal = ext4_get_journal(sb, journal_inum)))
2453 return -EINVAL;
2454 } else {
2455 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
2456 return -EINVAL;
2457 }
2458
2459 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
2460 err = jbd2_journal_update_format(journal);
2461 if (err) {
2462 printk(KERN_ERR "EXT4-fs: error updating journal.\n");
2463 jbd2_journal_destroy(journal);
2464 return err;
2465 }
2466 }
2467
2468 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
2469 err = jbd2_journal_wipe(journal, !really_read_only);
2470 if (!err)
2471 err = jbd2_journal_load(journal);
2472
2473 if (err) {
2474 printk(KERN_ERR "EXT4-fs: error loading journal.\n");
2475 jbd2_journal_destroy(journal);
2476 return err;
2477 }
2478
2479 EXT4_SB(sb)->s_journal = journal;
2480 ext4_clear_journal_err(sb, es);
2481
2482 if (journal_devnum &&
2483 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2484 es->s_journal_dev = cpu_to_le32(journal_devnum);
2485 sb->s_dirt = 1;
2486
2487 /* Make sure we flush the recovery flag to disk. */
2488 ext4_commit_super(sb, es, 1);
2489 }
2490
2491 return 0;
2492 }
2493
2494 static int ext4_create_journal(struct super_block * sb,
2495 struct ext4_super_block * es,
2496 unsigned int journal_inum)
2497 {
2498 journal_t *journal;
2499 int err;
2500
2501 if (sb->s_flags & MS_RDONLY) {
2502 printk(KERN_ERR "EXT4-fs: readonly filesystem when trying to "
2503 "create journal.\n");
2504 return -EROFS;
2505 }
2506
2507 journal = ext4_get_journal(sb, journal_inum);
2508 if (!journal)
2509 return -EINVAL;
2510
2511 printk(KERN_INFO "EXT4-fs: creating new journal on inode %u\n",
2512 journal_inum);
2513
2514 err = jbd2_journal_create(journal);
2515 if (err) {
2516 printk(KERN_ERR "EXT4-fs: error creating journal.\n");
2517 jbd2_journal_destroy(journal);
2518 return -EIO;
2519 }
2520
2521 EXT4_SB(sb)->s_journal = journal;
2522
2523 ext4_update_dynamic_rev(sb);
2524 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2525 EXT4_SET_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL);
2526
2527 es->s_journal_inum = cpu_to_le32(journal_inum);
2528 sb->s_dirt = 1;
2529
2530 /* Make sure we flush the recovery flag to disk. */
2531 ext4_commit_super(sb, es, 1);
2532
2533 return 0;
2534 }
2535
2536 static void ext4_commit_super (struct super_block * sb,
2537 struct ext4_super_block * es,
2538 int sync)
2539 {
2540 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
2541
2542 if (!sbh)
2543 return;
2544 es->s_wtime = cpu_to_le32(get_seconds());
2545 ext4_free_blocks_count_set(es, ext4_count_free_blocks(sb));
2546 es->s_free_inodes_count = cpu_to_le32(ext4_count_free_inodes(sb));
2547 BUFFER_TRACE(sbh, "marking dirty");
2548 mark_buffer_dirty(sbh);
2549 if (sync)
2550 sync_dirty_buffer(sbh);
2551 }
2552
2553
2554 /*
2555 * Have we just finished recovery? If so, and if we are mounting (or
2556 * remounting) the filesystem readonly, then we will end up with a
2557 * consistent fs on disk. Record that fact.
2558 */
2559 static void ext4_mark_recovery_complete(struct super_block * sb,
2560 struct ext4_super_block * es)
2561 {
2562 journal_t *journal = EXT4_SB(sb)->s_journal;
2563
2564 jbd2_journal_lock_updates(journal);
2565 jbd2_journal_flush(journal);
2566 lock_super(sb);
2567 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
2568 sb->s_flags & MS_RDONLY) {
2569 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2570 sb->s_dirt = 0;
2571 ext4_commit_super(sb, es, 1);
2572 }
2573 unlock_super(sb);
2574 jbd2_journal_unlock_updates(journal);
2575 }
2576
2577 /*
2578 * If we are mounting (or read-write remounting) a filesystem whose journal
2579 * has recorded an error from a previous lifetime, move that error to the
2580 * main filesystem now.
2581 */
2582 static void ext4_clear_journal_err(struct super_block * sb,
2583 struct ext4_super_block * es)
2584 {
2585 journal_t *journal;
2586 int j_errno;
2587 const char *errstr;
2588
2589 journal = EXT4_SB(sb)->s_journal;
2590
2591 /*
2592 * Now check for any error status which may have been recorded in the
2593 * journal by a prior ext4_error() or ext4_abort()
2594 */
2595
2596 j_errno = jbd2_journal_errno(journal);
2597 if (j_errno) {
2598 char nbuf[16];
2599
2600 errstr = ext4_decode_error(sb, j_errno, nbuf);
2601 ext4_warning(sb, __FUNCTION__, "Filesystem error recorded "
2602 "from previous mount: %s", errstr);
2603 ext4_warning(sb, __FUNCTION__, "Marking fs in need of "
2604 "filesystem check.");
2605
2606 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
2607 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
2608 ext4_commit_super (sb, es, 1);
2609
2610 jbd2_journal_clear_err(journal);
2611 }
2612 }
2613
2614 /*
2615 * Force the running and committing transactions to commit,
2616 * and wait on the commit.
2617 */
2618 int ext4_force_commit(struct super_block *sb)
2619 {
2620 journal_t *journal;
2621 int ret;
2622
2623 if (sb->s_flags & MS_RDONLY)
2624 return 0;
2625
2626 journal = EXT4_SB(sb)->s_journal;
2627 sb->s_dirt = 0;
2628 ret = ext4_journal_force_commit(journal);
2629 return ret;
2630 }
2631
2632 /*
2633 * Ext4 always journals updates to the superblock itself, so we don't
2634 * have to propagate any other updates to the superblock on disk at this
2635 * point. Just start an async writeback to get the buffers on their way
2636 * to the disk.
2637 *
2638 * This implicitly triggers the writebehind on sync().
2639 */
2640
2641 static void ext4_write_super (struct super_block * sb)
2642 {
2643 if (mutex_trylock(&sb->s_lock) != 0)
2644 BUG();
2645 sb->s_dirt = 0;
2646 }
2647
2648 static int ext4_sync_fs(struct super_block *sb, int wait)
2649 {
2650 tid_t target;
2651
2652 sb->s_dirt = 0;
2653 if (jbd2_journal_start_commit(EXT4_SB(sb)->s_journal, &target)) {
2654 if (wait)
2655 jbd2_log_wait_commit(EXT4_SB(sb)->s_journal, target);
2656 }
2657 return 0;
2658 }
2659
2660 /*
2661 * LVM calls this function before a (read-only) snapshot is created. This
2662 * gives us a chance to flush the journal completely and mark the fs clean.
2663 */
2664 static void ext4_write_super_lockfs(struct super_block *sb)
2665 {
2666 sb->s_dirt = 0;
2667
2668 if (!(sb->s_flags & MS_RDONLY)) {
2669 journal_t *journal = EXT4_SB(sb)->s_journal;
2670
2671 /* Now we set up the journal barrier. */
2672 jbd2_journal_lock_updates(journal);
2673 jbd2_journal_flush(journal);
2674
2675 /* Journal blocked and flushed, clear needs_recovery flag. */
2676 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2677 ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1);
2678 }
2679 }
2680
2681 /*
2682 * Called by LVM after the snapshot is done. We need to reset the RECOVER
2683 * flag here, even though the filesystem is not technically dirty yet.
2684 */
2685 static void ext4_unlockfs(struct super_block *sb)
2686 {
2687 if (!(sb->s_flags & MS_RDONLY)) {
2688 lock_super(sb);
2689 /* Reser the needs_recovery flag before the fs is unlocked. */
2690 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2691 ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1);
2692 unlock_super(sb);
2693 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
2694 }
2695 }
2696
2697 static int ext4_remount (struct super_block * sb, int * flags, char * data)
2698 {
2699 struct ext4_super_block * es;
2700 struct ext4_sb_info *sbi = EXT4_SB(sb);
2701 ext4_fsblk_t n_blocks_count = 0;
2702 unsigned long old_sb_flags;
2703 struct ext4_mount_options old_opts;
2704 int err;
2705 #ifdef CONFIG_QUOTA
2706 int i;
2707 #endif
2708
2709 /* Store the original options */
2710 old_sb_flags = sb->s_flags;
2711 old_opts.s_mount_opt = sbi->s_mount_opt;
2712 old_opts.s_resuid = sbi->s_resuid;
2713 old_opts.s_resgid = sbi->s_resgid;
2714 old_opts.s_commit_interval = sbi->s_commit_interval;
2715 #ifdef CONFIG_QUOTA
2716 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
2717 for (i = 0; i < MAXQUOTAS; i++)
2718 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
2719 #endif
2720
2721 /*
2722 * Allow the "check" option to be passed as a remount option.
2723 */
2724 if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
2725 err = -EINVAL;
2726 goto restore_opts;
2727 }
2728
2729 if (sbi->s_mount_opt & EXT4_MOUNT_ABORT)
2730 ext4_abort(sb, __FUNCTION__, "Abort forced by user");
2731
2732 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
2733 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
2734
2735 es = sbi->s_es;
2736
2737 ext4_init_journal_params(sb, sbi->s_journal);
2738
2739 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
2740 n_blocks_count > ext4_blocks_count(es)) {
2741 if (sbi->s_mount_opt & EXT4_MOUNT_ABORT) {
2742 err = -EROFS;
2743 goto restore_opts;
2744 }
2745
2746 if (*flags & MS_RDONLY) {
2747 /*
2748 * First of all, the unconditional stuff we have to do
2749 * to disable replay of the journal when we next remount
2750 */
2751 sb->s_flags |= MS_RDONLY;
2752
2753 /*
2754 * OK, test if we are remounting a valid rw partition
2755 * readonly, and if so set the rdonly flag and then
2756 * mark the partition as valid again.
2757 */
2758 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
2759 (sbi->s_mount_state & EXT4_VALID_FS))
2760 es->s_state = cpu_to_le16(sbi->s_mount_state);
2761
2762 /*
2763 * We have to unlock super so that we can wait for
2764 * transactions.
2765 */
2766 unlock_super(sb);
2767 ext4_mark_recovery_complete(sb, es);
2768 lock_super(sb);
2769 } else {
2770 __le32 ret;
2771 if ((ret = EXT4_HAS_RO_COMPAT_FEATURE(sb,
2772 ~EXT4_FEATURE_RO_COMPAT_SUPP))) {
2773 printk(KERN_WARNING "EXT4-fs: %s: couldn't "
2774 "remount RDWR because of unsupported "
2775 "optional features (%x).\n",
2776 sb->s_id, le32_to_cpu(ret));
2777 err = -EROFS;
2778 goto restore_opts;
2779 }
2780
2781 /*
2782 * If we have an unprocessed orphan list hanging
2783 * around from a previously readonly bdev mount,
2784 * require a full umount/remount for now.
2785 */
2786 if (es->s_last_orphan) {
2787 printk(KERN_WARNING "EXT4-fs: %s: couldn't "
2788 "remount RDWR because of unprocessed "
2789 "orphan inode list. Please "
2790 "umount/remount instead.\n",
2791 sb->s_id);
2792 err = -EINVAL;
2793 goto restore_opts;
2794 }
2795
2796 /*
2797 * Mounting a RDONLY partition read-write, so reread
2798 * and store the current valid flag. (It may have
2799 * been changed by e2fsck since we originally mounted
2800 * the partition.)
2801 */
2802 ext4_clear_journal_err(sb, es);
2803 sbi->s_mount_state = le16_to_cpu(es->s_state);
2804 if ((err = ext4_group_extend(sb, es, n_blocks_count)))
2805 goto restore_opts;
2806 if (!ext4_setup_super (sb, es, 0))
2807 sb->s_flags &= ~MS_RDONLY;
2808 }
2809 }
2810 #ifdef CONFIG_QUOTA
2811 /* Release old quota file names */
2812 for (i = 0; i < MAXQUOTAS; i++)
2813 if (old_opts.s_qf_names[i] &&
2814 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2815 kfree(old_opts.s_qf_names[i]);
2816 #endif
2817 return 0;
2818 restore_opts:
2819 sb->s_flags = old_sb_flags;
2820 sbi->s_mount_opt = old_opts.s_mount_opt;
2821 sbi->s_resuid = old_opts.s_resuid;
2822 sbi->s_resgid = old_opts.s_resgid;
2823 sbi->s_commit_interval = old_opts.s_commit_interval;
2824 #ifdef CONFIG_QUOTA
2825 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
2826 for (i = 0; i < MAXQUOTAS; i++) {
2827 if (sbi->s_qf_names[i] &&
2828 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2829 kfree(sbi->s_qf_names[i]);
2830 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
2831 }
2832 #endif
2833 return err;
2834 }
2835
2836 static int ext4_statfs (struct dentry * dentry, struct kstatfs * buf)
2837 {
2838 struct super_block *sb = dentry->d_sb;
2839 struct ext4_sb_info *sbi = EXT4_SB(sb);
2840 struct ext4_super_block *es = sbi->s_es;
2841 u64 fsid;
2842
2843 if (test_opt(sb, MINIX_DF)) {
2844 sbi->s_overhead_last = 0;
2845 } else if (sbi->s_blocks_last != ext4_blocks_count(es)) {
2846 ext4_group_t ngroups = sbi->s_groups_count, i;
2847 ext4_fsblk_t overhead = 0;
2848 smp_rmb();
2849
2850 /*
2851 * Compute the overhead (FS structures). This is constant
2852 * for a given filesystem unless the number of block groups
2853 * changes so we cache the previous value until it does.
2854 */
2855
2856 /*
2857 * All of the blocks before first_data_block are
2858 * overhead
2859 */
2860 overhead = le32_to_cpu(es->s_first_data_block);
2861
2862 /*
2863 * Add the overhead attributed to the superblock and
2864 * block group descriptors. If the sparse superblocks
2865 * feature is turned on, then not all groups have this.
2866 */
2867 for (i = 0; i < ngroups; i++) {
2868 overhead += ext4_bg_has_super(sb, i) +
2869 ext4_bg_num_gdb(sb, i);
2870 cond_resched();
2871 }
2872
2873 /*
2874 * Every block group has an inode bitmap, a block
2875 * bitmap, and an inode table.
2876 */
2877 overhead += ngroups * (2 + sbi->s_itb_per_group);
2878 sbi->s_overhead_last = overhead;
2879 smp_wmb();
2880 sbi->s_blocks_last = ext4_blocks_count(es);
2881 }
2882
2883 buf->f_type = EXT4_SUPER_MAGIC;
2884 buf->f_bsize = sb->s_blocksize;
2885 buf->f_blocks = ext4_blocks_count(es) - sbi->s_overhead_last;
2886 buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter);
2887 ext4_free_blocks_count_set(es, buf->f_bfree);
2888 buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es);
2889 if (buf->f_bfree < ext4_r_blocks_count(es))
2890 buf->f_bavail = 0;
2891 buf->f_files = le32_to_cpu(es->s_inodes_count);
2892 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
2893 es->s_free_inodes_count = cpu_to_le32(buf->f_ffree);
2894 buf->f_namelen = EXT4_NAME_LEN;
2895 fsid = le64_to_cpup((void *)es->s_uuid) ^
2896 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
2897 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
2898 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
2899 return 0;
2900 }
2901
2902 /* Helper function for writing quotas on sync - we need to start transaction before quota file
2903 * is locked for write. Otherwise the are possible deadlocks:
2904 * Process 1 Process 2
2905 * ext4_create() quota_sync()
2906 * jbd2_journal_start() write_dquot()
2907 * DQUOT_INIT() down(dqio_mutex)
2908 * down(dqio_mutex) jbd2_journal_start()
2909 *
2910 */
2911
2912 #ifdef CONFIG_QUOTA
2913
2914 static inline struct inode *dquot_to_inode(struct dquot *dquot)
2915 {
2916 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
2917 }
2918
2919 static int ext4_dquot_initialize(struct inode *inode, int type)
2920 {
2921 handle_t *handle;
2922 int ret, err;
2923
2924 /* We may create quota structure so we need to reserve enough blocks */
2925 handle = ext4_journal_start(inode, 2*EXT4_QUOTA_INIT_BLOCKS(inode->i_sb));
2926 if (IS_ERR(handle))
2927 return PTR_ERR(handle);
2928 ret = dquot_initialize(inode, type);
2929 err = ext4_journal_stop(handle);
2930 if (!ret)
2931 ret = err;
2932 return ret;
2933 }
2934
2935 static int ext4_dquot_drop(struct inode *inode)
2936 {
2937 handle_t *handle;
2938 int ret, err;
2939
2940 /* We may delete quota structure so we need to reserve enough blocks */
2941 handle = ext4_journal_start(inode, 2*EXT4_QUOTA_DEL_BLOCKS(inode->i_sb));
2942 if (IS_ERR(handle))
2943 return PTR_ERR(handle);
2944 ret = dquot_drop(inode);
2945 err = ext4_journal_stop(handle);
2946 if (!ret)
2947 ret = err;
2948 return ret;
2949 }
2950
2951 static int ext4_write_dquot(struct dquot *dquot)
2952 {
2953 int ret, err;
2954 handle_t *handle;
2955 struct inode *inode;
2956
2957 inode = dquot_to_inode(dquot);
2958 handle = ext4_journal_start(inode,
2959 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2960 if (IS_ERR(handle))
2961 return PTR_ERR(handle);
2962 ret = dquot_commit(dquot);
2963 err = ext4_journal_stop(handle);
2964 if (!ret)
2965 ret = err;
2966 return ret;
2967 }
2968
2969 static int ext4_acquire_dquot(struct dquot *dquot)
2970 {
2971 int ret, err;
2972 handle_t *handle;
2973
2974 handle = ext4_journal_start(dquot_to_inode(dquot),
2975 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2976 if (IS_ERR(handle))
2977 return PTR_ERR(handle);
2978 ret = dquot_acquire(dquot);
2979 err = ext4_journal_stop(handle);
2980 if (!ret)
2981 ret = err;
2982 return ret;
2983 }
2984
2985 static int ext4_release_dquot(struct dquot *dquot)
2986 {
2987 int ret, err;
2988 handle_t *handle;
2989
2990 handle = ext4_journal_start(dquot_to_inode(dquot),
2991 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2992 if (IS_ERR(handle)) {
2993 /* Release dquot anyway to avoid endless cycle in dqput() */
2994 dquot_release(dquot);
2995 return PTR_ERR(handle);
2996 }
2997 ret = dquot_release(dquot);
2998 err = ext4_journal_stop(handle);
2999 if (!ret)
3000 ret = err;
3001 return ret;
3002 }
3003
3004 static int ext4_mark_dquot_dirty(struct dquot *dquot)
3005 {
3006 /* Are we journalling quotas? */
3007 if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
3008 EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
3009 dquot_mark_dquot_dirty(dquot);
3010 return ext4_write_dquot(dquot);
3011 } else {
3012 return dquot_mark_dquot_dirty(dquot);
3013 }
3014 }
3015
3016 static int ext4_write_info(struct super_block *sb, int type)
3017 {
3018 int ret, err;
3019 handle_t *handle;
3020
3021 /* Data block + inode block */
3022 handle = ext4_journal_start(sb->s_root->d_inode, 2);
3023 if (IS_ERR(handle))
3024 return PTR_ERR(handle);
3025 ret = dquot_commit_info(sb, type);
3026 err = ext4_journal_stop(handle);
3027 if (!ret)
3028 ret = err;
3029 return ret;
3030 }
3031
3032 /*
3033 * Turn on quotas during mount time - we need to find
3034 * the quota file and such...
3035 */
3036 static int ext4_quota_on_mount(struct super_block *sb, int type)
3037 {
3038 return vfs_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
3039 EXT4_SB(sb)->s_jquota_fmt, type);
3040 }
3041
3042 /*
3043 * Standard function to be called on quota_on
3044 */
3045 static int ext4_quota_on(struct super_block *sb, int type, int format_id,
3046 char *path)
3047 {
3048 int err;
3049 struct nameidata nd;
3050
3051 if (!test_opt(sb, QUOTA))
3052 return -EINVAL;
3053 /* Not journalling quota? */
3054 if (!EXT4_SB(sb)->s_qf_names[USRQUOTA] &&
3055 !EXT4_SB(sb)->s_qf_names[GRPQUOTA])
3056 return vfs_quota_on(sb, type, format_id, path);
3057 err = path_lookup(path, LOOKUP_FOLLOW, &nd);
3058 if (err)
3059 return err;
3060 /* Quotafile not on the same filesystem? */
3061 if (nd.mnt->mnt_sb != sb) {
3062 path_release(&nd);
3063 return -EXDEV;
3064 }
3065 /* Quotafile not of fs root? */
3066 if (nd.dentry->d_parent->d_inode != sb->s_root->d_inode)
3067 printk(KERN_WARNING
3068 "EXT4-fs: Quota file not on filesystem root. "
3069 "Journalled quota will not work.\n");
3070 path_release(&nd);
3071 return vfs_quota_on(sb, type, format_id, path);
3072 }
3073
3074 /* Read data from quotafile - avoid pagecache and such because we cannot afford
3075 * acquiring the locks... As quota files are never truncated and quota code
3076 * itself serializes the operations (and noone else should touch the files)
3077 * we don't have to be afraid of races */
3078 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
3079 size_t len, loff_t off)
3080 {
3081 struct inode *inode = sb_dqopt(sb)->files[type];
3082 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
3083 int err = 0;
3084 int offset = off & (sb->s_blocksize - 1);
3085 int tocopy;
3086 size_t toread;
3087 struct buffer_head *bh;
3088 loff_t i_size = i_size_read(inode);
3089
3090 if (off > i_size)
3091 return 0;
3092 if (off+len > i_size)
3093 len = i_size-off;
3094 toread = len;
3095 while (toread > 0) {
3096 tocopy = sb->s_blocksize - offset < toread ?
3097 sb->s_blocksize - offset : toread;
3098 bh = ext4_bread(NULL, inode, blk, 0, &err);
3099 if (err)
3100 return err;
3101 if (!bh) /* A hole? */
3102 memset(data, 0, tocopy);
3103 else
3104 memcpy(data, bh->b_data+offset, tocopy);
3105 brelse(bh);
3106 offset = 0;
3107 toread -= tocopy;
3108 data += tocopy;
3109 blk++;
3110 }
3111 return len;
3112 }
3113
3114 /* Write to quotafile (we know the transaction is already started and has
3115 * enough credits) */
3116 static ssize_t ext4_quota_write(struct super_block *sb, int type,
3117 const char *data, size_t len, loff_t off)
3118 {
3119 struct inode *inode = sb_dqopt(sb)->files[type];
3120 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
3121 int err = 0;
3122 int offset = off & (sb->s_blocksize - 1);
3123 int tocopy;
3124 int journal_quota = EXT4_SB(sb)->s_qf_names[type] != NULL;
3125 size_t towrite = len;
3126 struct buffer_head *bh;
3127 handle_t *handle = journal_current_handle();
3128
3129 if (!handle) {
3130 printk(KERN_WARNING "EXT4-fs: Quota write (off=%Lu, len=%Lu)"
3131 " cancelled because transaction is not started.\n",
3132 (unsigned long long)off, (unsigned long long)len);
3133 return -EIO;
3134 }
3135 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
3136 while (towrite > 0) {
3137 tocopy = sb->s_blocksize - offset < towrite ?
3138 sb->s_blocksize - offset : towrite;
3139 bh = ext4_bread(handle, inode, blk, 1, &err);
3140 if (!bh)
3141 goto out;
3142 if (journal_quota) {
3143 err = ext4_journal_get_write_access(handle, bh);
3144 if (err) {
3145 brelse(bh);
3146 goto out;
3147 }
3148 }
3149 lock_buffer(bh);
3150 memcpy(bh->b_data+offset, data, tocopy);
3151 flush_dcache_page(bh->b_page);
3152 unlock_buffer(bh);
3153 if (journal_quota)
3154 err = ext4_journal_dirty_metadata(handle, bh);
3155 else {
3156 /* Always do at least ordered writes for quotas */
3157 err = ext4_journal_dirty_data(handle, bh);
3158 mark_buffer_dirty(bh);
3159 }
3160 brelse(bh);
3161 if (err)
3162 goto out;
3163 offset = 0;
3164 towrite -= tocopy;
3165 data += tocopy;
3166 blk++;
3167 }
3168 out:
3169 if (len == towrite)
3170 return err;
3171 if (inode->i_size < off+len-towrite) {
3172 i_size_write(inode, off+len-towrite);
3173 EXT4_I(inode)->i_disksize = inode->i_size;
3174 }
3175 inode->i_version++;
3176 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
3177 ext4_mark_inode_dirty(handle, inode);
3178 mutex_unlock(&inode->i_mutex);
3179 return len - towrite;
3180 }
3181
3182 #endif
3183
3184 static int ext4_get_sb(struct file_system_type *fs_type,
3185 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
3186 {
3187 return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super, mnt);
3188 }
3189
3190 static struct file_system_type ext4dev_fs_type = {
3191 .owner = THIS_MODULE,
3192 .name = "ext4dev",
3193 .get_sb = ext4_get_sb,
3194 .kill_sb = kill_block_super,
3195 .fs_flags = FS_REQUIRES_DEV,
3196 };
3197
3198 static int __init init_ext4_fs(void)
3199 {
3200 int err = init_ext4_xattr();
3201 if (err)
3202 return err;
3203 err = init_inodecache();
3204 if (err)
3205 goto out1;
3206 err = register_filesystem(&ext4dev_fs_type);
3207 if (err)
3208 goto out;
3209 return 0;
3210 out:
3211 destroy_inodecache();
3212 out1:
3213 exit_ext4_xattr();
3214 return err;
3215 }
3216
3217 static void __exit exit_ext4_fs(void)
3218 {
3219 unregister_filesystem(&ext4dev_fs_type);
3220 destroy_inodecache();
3221 exit_ext4_xattr();
3222 }
3223
3224 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
3225 MODULE_DESCRIPTION("Fourth Extended Filesystem with extents");
3226 MODULE_LICENSE("GPL");
3227 module_init(init_ext4_fs)
3228 module_exit(exit_ext4_fs)
x86 "subsystem" repository