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ACPI: thinkpad-acpi: cleanup after rename
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / ext4 / super.c
blobfa1d1f3da9d243f9e4574d3ed0023a8efd0ada5d
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/vfs.h>
33 #include <linux/random.h>
34 #include <linux/mount.h>
35 #include <linux/namei.h>
36 #include <linux/quotaops.h>
37 #include <linux/seq_file.h>
38
39 #include <asm/uaccess.h>
40
41 #include "xattr.h"
42 #include "acl.h"
43 #include "namei.h"
44
45 static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
46 unsigned long journal_devnum);
47 static int ext4_create_journal(struct super_block *, struct ext4_super_block *,
48 unsigned int);
49 static void ext4_commit_super (struct super_block * sb,
50 struct ext4_super_block * es,
51 int sync);
52 static void ext4_mark_recovery_complete(struct super_block * sb,
53 struct ext4_super_block * es);
54 static void ext4_clear_journal_err(struct super_block * sb,
55 struct ext4_super_block * es);
56 static int ext4_sync_fs(struct super_block *sb, int wait);
57 static const char *ext4_decode_error(struct super_block * sb, int errno,
58 char nbuf[16]);
59 static int ext4_remount (struct super_block * sb, int * flags, char * data);
60 static int ext4_statfs (struct dentry * dentry, struct kstatfs * buf);
61 static void ext4_unlockfs(struct super_block *sb);
62 static void ext4_write_super (struct super_block * sb);
63 static void ext4_write_super_lockfs(struct super_block *sb);
64
65
66 ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
67 struct ext4_group_desc *bg)
68 {
69 return le32_to_cpu(bg->bg_block_bitmap) |
70 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
71 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
72 }
73
74 ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
75 struct ext4_group_desc *bg)
76 {
77 return le32_to_cpu(bg->bg_inode_bitmap) |
78 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
79 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
80 }
81
82 ext4_fsblk_t ext4_inode_table(struct super_block *sb,
83 struct ext4_group_desc *bg)
84 {
85 return le32_to_cpu(bg->bg_inode_table) |
86 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
87 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
88 }
89
90 void ext4_block_bitmap_set(struct super_block *sb,
91 struct ext4_group_desc *bg, ext4_fsblk_t blk)
92 {
93 bg->bg_block_bitmap = cpu_to_le32((u32)blk);
94 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
95 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
96 }
97
98 void ext4_inode_bitmap_set(struct super_block *sb,
99 struct ext4_group_desc *bg, ext4_fsblk_t blk)
100 {
101 bg->bg_inode_bitmap = cpu_to_le32((u32)blk);
102 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
103 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
104 }
105
106 void ext4_inode_table_set(struct super_block *sb,
107 struct ext4_group_desc *bg, ext4_fsblk_t blk)
108 {
109 bg->bg_inode_table = cpu_to_le32((u32)blk);
110 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
111 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
112 }
113
114 /*
115 * Wrappers for jbd2_journal_start/end.
116 *
117 * The only special thing we need to do here is to make sure that all
118 * journal_end calls result in the superblock being marked dirty, so
119 * that sync() will call the filesystem's write_super callback if
120 * appropriate.
121 */
122 handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks)
123 {
124 journal_t *journal;
125
126 if (sb->s_flags & MS_RDONLY)
127 return ERR_PTR(-EROFS);
128
129 /* Special case here: if the journal has aborted behind our
130 * backs (eg. EIO in the commit thread), then we still need to
131 * take the FS itself readonly cleanly. */
132 journal = EXT4_SB(sb)->s_journal;
133 if (is_journal_aborted(journal)) {
134 ext4_abort(sb, __FUNCTION__,
135 "Detected aborted journal");
136 return ERR_PTR(-EROFS);
137 }
138
139 return jbd2_journal_start(journal, nblocks);
140 }
141
142 /*
143 * The only special thing we need to do here is to make sure that all
144 * jbd2_journal_stop calls result in the superblock being marked dirty, so
145 * that sync() will call the filesystem's write_super callback if
146 * appropriate.
147 */
148 int __ext4_journal_stop(const char *where, handle_t *handle)
149 {
150 struct super_block *sb;
151 int err;
152 int rc;
153
154 sb = handle->h_transaction->t_journal->j_private;
155 err = handle->h_err;
156 rc = jbd2_journal_stop(handle);
157
158 if (!err)
159 err = rc;
160 if (err)
161 __ext4_std_error(sb, where, err);
162 return err;
163 }
164
165 void ext4_journal_abort_handle(const char *caller, const char *err_fn,
166 struct buffer_head *bh, handle_t *handle, int err)
167 {
168 char nbuf[16];
169 const char *errstr = ext4_decode_error(NULL, err, nbuf);
170
171 if (bh)
172 BUFFER_TRACE(bh, "abort");
173
174 if (!handle->h_err)
175 handle->h_err = err;
176
177 if (is_handle_aborted(handle))
178 return;
179
180 printk(KERN_ERR "%s: aborting transaction: %s in %s\n",
181 caller, errstr, err_fn);
182
183 jbd2_journal_abort_handle(handle);
184 }
185
186 /* Deal with the reporting of failure conditions on a filesystem such as
187 * inconsistencies detected or read IO failures.
188 *
189 * On ext2, we can store the error state of the filesystem in the
190 * superblock. That is not possible on ext4, because we may have other
191 * write ordering constraints on the superblock which prevent us from
192 * writing it out straight away; and given that the journal is about to
193 * be aborted, we can't rely on the current, or future, transactions to
194 * write out the superblock safely.
195 *
196 * We'll just use the jbd2_journal_abort() error code to record an error in
197 * the journal instead. On recovery, the journal will compain about
198 * that error until we've noted it down and cleared it.
199 */
200
201 static void ext4_handle_error(struct super_block *sb)
202 {
203 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
204
205 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
206 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
207
208 if (sb->s_flags & MS_RDONLY)
209 return;
210
211 if (!test_opt (sb, ERRORS_CONT)) {
212 journal_t *journal = EXT4_SB(sb)->s_journal;
213
214 EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT;
215 if (journal)
216 jbd2_journal_abort(journal, -EIO);
217 }
218 if (test_opt (sb, ERRORS_RO)) {
219 printk (KERN_CRIT "Remounting filesystem read-only\n");
220 sb->s_flags |= MS_RDONLY;
221 }
222 ext4_commit_super(sb, es, 1);
223 if (test_opt(sb, ERRORS_PANIC))
224 panic("EXT4-fs (device %s): panic forced after error\n",
225 sb->s_id);
226 }
227
228 void ext4_error (struct super_block * sb, const char * function,
229 const char * fmt, ...)
230 {
231 va_list args;
232
233 va_start(args, fmt);
234 printk(KERN_CRIT "EXT4-fs error (device %s): %s: ",sb->s_id, function);
235 vprintk(fmt, args);
236 printk("\n");
237 va_end(args);
238
239 ext4_handle_error(sb);
240 }
241
242 static const char *ext4_decode_error(struct super_block * sb, int errno,
243 char nbuf[16])
244 {
245 char *errstr = NULL;
246
247 switch (errno) {
248 case -EIO:
249 errstr = "IO failure";
250 break;
251 case -ENOMEM:
252 errstr = "Out of memory";
253 break;
254 case -EROFS:
255 if (!sb || EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT)
256 errstr = "Journal has aborted";
257 else
258 errstr = "Readonly filesystem";
259 break;
260 default:
261 /* If the caller passed in an extra buffer for unknown
262 * errors, textualise them now. Else we just return
263 * NULL. */
264 if (nbuf) {
265 /* Check for truncated error codes... */
266 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
267 errstr = nbuf;
268 }
269 break;
270 }
271
272 return errstr;
273 }
274
275 /* __ext4_std_error decodes expected errors from journaling functions
276 * automatically and invokes the appropriate error response. */
277
278 void __ext4_std_error (struct super_block * sb, const char * function,
279 int errno)
280 {
281 char nbuf[16];
282 const char *errstr;
283
284 /* Special case: if the error is EROFS, and we're not already
285 * inside a transaction, then there's really no point in logging
286 * an error. */
287 if (errno == -EROFS && journal_current_handle() == NULL &&
288 (sb->s_flags & MS_RDONLY))
289 return;
290
291 errstr = ext4_decode_error(sb, errno, nbuf);
292 printk (KERN_CRIT "EXT4-fs error (device %s) in %s: %s\n",
293 sb->s_id, function, errstr);
294
295 ext4_handle_error(sb);
296 }
297
298 /*
299 * ext4_abort is a much stronger failure handler than ext4_error. The
300 * abort function may be used to deal with unrecoverable failures such
301 * as journal IO errors or ENOMEM at a critical moment in log management.
302 *
303 * We unconditionally force the filesystem into an ABORT|READONLY state,
304 * unless the error response on the fs has been set to panic in which
305 * case we take the easy way out and panic immediately.
306 */
307
308 void ext4_abort (struct super_block * sb, const char * function,
309 const char * fmt, ...)
310 {
311 va_list args;
312
313 printk (KERN_CRIT "ext4_abort called.\n");
314
315 va_start(args, fmt);
316 printk(KERN_CRIT "EXT4-fs error (device %s): %s: ",sb->s_id, function);
317 vprintk(fmt, args);
318 printk("\n");
319 va_end(args);
320
321 if (test_opt(sb, ERRORS_PANIC))
322 panic("EXT4-fs panic from previous error\n");
323
324 if (sb->s_flags & MS_RDONLY)
325 return;
326
327 printk(KERN_CRIT "Remounting filesystem read-only\n");
328 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
329 sb->s_flags |= MS_RDONLY;
330 EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT;
331 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
332 }
333
334 void ext4_warning (struct super_block * sb, const char * function,
335 const char * fmt, ...)
336 {
337 va_list args;
338
339 va_start(args, fmt);
340 printk(KERN_WARNING "EXT4-fs warning (device %s): %s: ",
341 sb->s_id, function);
342 vprintk(fmt, args);
343 printk("\n");
344 va_end(args);
345 }
346
347 void ext4_update_dynamic_rev(struct super_block *sb)
348 {
349 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
350
351 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
352 return;
353
354 ext4_warning(sb, __FUNCTION__,
355 "updating to rev %d because of new feature flag, "
356 "running e2fsck is recommended",
357 EXT4_DYNAMIC_REV);
358
359 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
360 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
361 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
362 /* leave es->s_feature_*compat flags alone */
363 /* es->s_uuid will be set by e2fsck if empty */
364
365 /*
366 * The rest of the superblock fields should be zero, and if not it
367 * means they are likely already in use, so leave them alone. We
368 * can leave it up to e2fsck to clean up any inconsistencies there.
369 */
370 }
371
372 /*
373 * Open the external journal device
374 */
375 static struct block_device *ext4_blkdev_get(dev_t dev)
376 {
377 struct block_device *bdev;
378 char b[BDEVNAME_SIZE];
379
380 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
381 if (IS_ERR(bdev))
382 goto fail;
383 return bdev;
384
385 fail:
386 printk(KERN_ERR "EXT4: failed to open journal device %s: %ld\n",
387 __bdevname(dev, b), PTR_ERR(bdev));
388 return NULL;
389 }
390
391 /*
392 * Release the journal device
393 */
394 static int ext4_blkdev_put(struct block_device *bdev)
395 {
396 bd_release(bdev);
397 return blkdev_put(bdev);
398 }
399
400 static int ext4_blkdev_remove(struct ext4_sb_info *sbi)
401 {
402 struct block_device *bdev;
403 int ret = -ENODEV;
404
405 bdev = sbi->journal_bdev;
406 if (bdev) {
407 ret = ext4_blkdev_put(bdev);
408 sbi->journal_bdev = NULL;
409 }
410 return ret;
411 }
412
413 static inline struct inode *orphan_list_entry(struct list_head *l)
414 {
415 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
416 }
417
418 static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
419 {
420 struct list_head *l;
421
422 printk(KERN_ERR "sb orphan head is %d\n",
423 le32_to_cpu(sbi->s_es->s_last_orphan));
424
425 printk(KERN_ERR "sb_info orphan list:\n");
426 list_for_each(l, &sbi->s_orphan) {
427 struct inode *inode = orphan_list_entry(l);
428 printk(KERN_ERR " "
429 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
430 inode->i_sb->s_id, inode->i_ino, inode,
431 inode->i_mode, inode->i_nlink,
432 NEXT_ORPHAN(inode));
433 }
434 }
435
436 static void ext4_put_super (struct super_block * sb)
437 {
438 struct ext4_sb_info *sbi = EXT4_SB(sb);
439 struct ext4_super_block *es = sbi->s_es;
440 int i;
441
442 ext4_ext_release(sb);
443 ext4_xattr_put_super(sb);
444 jbd2_journal_destroy(sbi->s_journal);
445 if (!(sb->s_flags & MS_RDONLY)) {
446 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
447 es->s_state = cpu_to_le16(sbi->s_mount_state);
448 BUFFER_TRACE(sbi->s_sbh, "marking dirty");
449 mark_buffer_dirty(sbi->s_sbh);
450 ext4_commit_super(sb, es, 1);
451 }
452
453 for (i = 0; i < sbi->s_gdb_count; i++)
454 brelse(sbi->s_group_desc[i]);
455 kfree(sbi->s_group_desc);
456 percpu_counter_destroy(&sbi->s_freeblocks_counter);
457 percpu_counter_destroy(&sbi->s_freeinodes_counter);
458 percpu_counter_destroy(&sbi->s_dirs_counter);
459 brelse(sbi->s_sbh);
460 #ifdef CONFIG_QUOTA
461 for (i = 0; i < MAXQUOTAS; i++)
462 kfree(sbi->s_qf_names[i]);
463 #endif
464
465 /* Debugging code just in case the in-memory inode orphan list
466 * isn't empty. The on-disk one can be non-empty if we've
467 * detected an error and taken the fs readonly, but the
468 * in-memory list had better be clean by this point. */
469 if (!list_empty(&sbi->s_orphan))
470 dump_orphan_list(sb, sbi);
471 J_ASSERT(list_empty(&sbi->s_orphan));
472
473 invalidate_bdev(sb->s_bdev, 0);
474 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
475 /*
476 * Invalidate the journal device's buffers. We don't want them
477 * floating about in memory - the physical journal device may
478 * hotswapped, and it breaks the `ro-after' testing code.
479 */
480 sync_blockdev(sbi->journal_bdev);
481 invalidate_bdev(sbi->journal_bdev, 0);
482 ext4_blkdev_remove(sbi);
483 }
484 sb->s_fs_info = NULL;
485 kfree(sbi);
486 return;
487 }
488
489 static struct kmem_cache *ext4_inode_cachep;
490
491 /*
492 * Called inside transaction, so use GFP_NOFS
493 */
494 static struct inode *ext4_alloc_inode(struct super_block *sb)
495 {
496 struct ext4_inode_info *ei;
497
498 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
499 if (!ei)
500 return NULL;
501 #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
502 ei->i_acl = EXT4_ACL_NOT_CACHED;
503 ei->i_default_acl = EXT4_ACL_NOT_CACHED;
504 #endif
505 ei->i_block_alloc_info = NULL;
506 ei->vfs_inode.i_version = 1;
507 memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache));
508 return &ei->vfs_inode;
509 }
510
511 static void ext4_destroy_inode(struct inode *inode)
512 {
513 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
514 }
515
516 static void init_once(void * foo, struct kmem_cache * cachep, unsigned long flags)
517 {
518 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
519
520 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
521 SLAB_CTOR_CONSTRUCTOR) {
522 INIT_LIST_HEAD(&ei->i_orphan);
523 #ifdef CONFIG_EXT4DEV_FS_XATTR
524 init_rwsem(&ei->xattr_sem);
525 #endif
526 mutex_init(&ei->truncate_mutex);
527 inode_init_once(&ei->vfs_inode);
528 }
529 }
530
531 static int init_inodecache(void)
532 {
533 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
534 sizeof(struct ext4_inode_info),
535 0, (SLAB_RECLAIM_ACCOUNT|
536 SLAB_MEM_SPREAD),
537 init_once, NULL);
538 if (ext4_inode_cachep == NULL)
539 return -ENOMEM;
540 return 0;
541 }
542
543 static void destroy_inodecache(void)
544 {
545 kmem_cache_destroy(ext4_inode_cachep);
546 }
547
548 static void ext4_clear_inode(struct inode *inode)
549 {
550 struct ext4_block_alloc_info *rsv = EXT4_I(inode)->i_block_alloc_info;
551 #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
552 if (EXT4_I(inode)->i_acl &&
553 EXT4_I(inode)->i_acl != EXT4_ACL_NOT_CACHED) {
554 posix_acl_release(EXT4_I(inode)->i_acl);
555 EXT4_I(inode)->i_acl = EXT4_ACL_NOT_CACHED;
556 }
557 if (EXT4_I(inode)->i_default_acl &&
558 EXT4_I(inode)->i_default_acl != EXT4_ACL_NOT_CACHED) {
559 posix_acl_release(EXT4_I(inode)->i_default_acl);
560 EXT4_I(inode)->i_default_acl = EXT4_ACL_NOT_CACHED;
561 }
562 #endif
563 ext4_discard_reservation(inode);
564 EXT4_I(inode)->i_block_alloc_info = NULL;
565 if (unlikely(rsv))
566 kfree(rsv);
567 }
568
569 static inline void ext4_show_quota_options(struct seq_file *seq, struct super_block *sb)
570 {
571 #if defined(CONFIG_QUOTA)
572 struct ext4_sb_info *sbi = EXT4_SB(sb);
573
574 if (sbi->s_jquota_fmt)
575 seq_printf(seq, ",jqfmt=%s",
576 (sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold": "vfsv0");
577
578 if (sbi->s_qf_names[USRQUOTA])
579 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
580
581 if (sbi->s_qf_names[GRPQUOTA])
582 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
583
584 if (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA)
585 seq_puts(seq, ",usrquota");
586
587 if (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)
588 seq_puts(seq, ",grpquota");
589 #endif
590 }
591
592 static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs)
593 {
594 struct super_block *sb = vfs->mnt_sb;
595
596 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
597 seq_puts(seq, ",data=journal");
598 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
599 seq_puts(seq, ",data=ordered");
600 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
601 seq_puts(seq, ",data=writeback");
602
603 ext4_show_quota_options(seq, sb);
604
605 return 0;
606 }
607
608
609 static struct dentry *ext4_get_dentry(struct super_block *sb, void *vobjp)
610 {
611 __u32 *objp = vobjp;
612 unsigned long ino = objp[0];
613 __u32 generation = objp[1];
614 struct inode *inode;
615 struct dentry *result;
616
617 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
618 return ERR_PTR(-ESTALE);
619 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
620 return ERR_PTR(-ESTALE);
621
622 /* iget isn't really right if the inode is currently unallocated!!
623 *
624 * ext4_read_inode will return a bad_inode if the inode had been
625 * deleted, so we should be safe.
626 *
627 * Currently we don't know the generation for parent directory, so
628 * a generation of 0 means "accept any"
629 */
630 inode = iget(sb, ino);
631 if (inode == NULL)
632 return ERR_PTR(-ENOMEM);
633 if (is_bad_inode(inode) ||
634 (generation && inode->i_generation != generation)) {
635 iput(inode);
636 return ERR_PTR(-ESTALE);
637 }
638 /* now to find a dentry.
639 * If possible, get a well-connected one
640 */
641 result = d_alloc_anon(inode);
642 if (!result) {
643 iput(inode);
644 return ERR_PTR(-ENOMEM);
645 }
646 return result;
647 }
648
649 #ifdef CONFIG_QUOTA
650 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
651 #define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
652
653 static int ext4_dquot_initialize(struct inode *inode, int type);
654 static int ext4_dquot_drop(struct inode *inode);
655 static int ext4_write_dquot(struct dquot *dquot);
656 static int ext4_acquire_dquot(struct dquot *dquot);
657 static int ext4_release_dquot(struct dquot *dquot);
658 static int ext4_mark_dquot_dirty(struct dquot *dquot);
659 static int ext4_write_info(struct super_block *sb, int type);
660 static int ext4_quota_on(struct super_block *sb, int type, int format_id, char *path);
661 static int ext4_quota_on_mount(struct super_block *sb, int type);
662 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
663 size_t len, loff_t off);
664 static ssize_t ext4_quota_write(struct super_block *sb, int type,
665 const char *data, size_t len, loff_t off);
666
667 static struct dquot_operations ext4_quota_operations = {
668 .initialize = ext4_dquot_initialize,
669 .drop = ext4_dquot_drop,
670 .alloc_space = dquot_alloc_space,
671 .alloc_inode = dquot_alloc_inode,
672 .free_space = dquot_free_space,
673 .free_inode = dquot_free_inode,
674 .transfer = dquot_transfer,
675 .write_dquot = ext4_write_dquot,
676 .acquire_dquot = ext4_acquire_dquot,
677 .release_dquot = ext4_release_dquot,
678 .mark_dirty = ext4_mark_dquot_dirty,
679 .write_info = ext4_write_info
680 };
681
682 static struct quotactl_ops ext4_qctl_operations = {
683 .quota_on = ext4_quota_on,
684 .quota_off = vfs_quota_off,
685 .quota_sync = vfs_quota_sync,
686 .get_info = vfs_get_dqinfo,
687 .set_info = vfs_set_dqinfo,
688 .get_dqblk = vfs_get_dqblk,
689 .set_dqblk = vfs_set_dqblk
690 };
691 #endif
692
693 static struct super_operations ext4_sops = {
694 .alloc_inode = ext4_alloc_inode,
695 .destroy_inode = ext4_destroy_inode,
696 .read_inode = ext4_read_inode,
697 .write_inode = ext4_write_inode,
698 .dirty_inode = ext4_dirty_inode,
699 .delete_inode = ext4_delete_inode,
700 .put_super = ext4_put_super,
701 .write_super = ext4_write_super,
702 .sync_fs = ext4_sync_fs,
703 .write_super_lockfs = ext4_write_super_lockfs,
704 .unlockfs = ext4_unlockfs,
705 .statfs = ext4_statfs,
706 .remount_fs = ext4_remount,
707 .clear_inode = ext4_clear_inode,
708 .show_options = ext4_show_options,
709 #ifdef CONFIG_QUOTA
710 .quota_read = ext4_quota_read,
711 .quota_write = ext4_quota_write,
712 #endif
713 };
714
715 static struct export_operations ext4_export_ops = {
716 .get_parent = ext4_get_parent,
717 .get_dentry = ext4_get_dentry,
718 };
719
720 enum {
721 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
722 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
723 Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
724 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
725 Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh,
726 Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
727 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
728 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
729 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota,
730 Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota,
731 Opt_grpquota, Opt_extents,
732 };
733
734 static match_table_t tokens = {
735 {Opt_bsd_df, "bsddf"},
736 {Opt_minix_df, "minixdf"},
737 {Opt_grpid, "grpid"},
738 {Opt_grpid, "bsdgroups"},
739 {Opt_nogrpid, "nogrpid"},
740 {Opt_nogrpid, "sysvgroups"},
741 {Opt_resgid, "resgid=%u"},
742 {Opt_resuid, "resuid=%u"},
743 {Opt_sb, "sb=%u"},
744 {Opt_err_cont, "errors=continue"},
745 {Opt_err_panic, "errors=panic"},
746 {Opt_err_ro, "errors=remount-ro"},
747 {Opt_nouid32, "nouid32"},
748 {Opt_nocheck, "nocheck"},
749 {Opt_nocheck, "check=none"},
750 {Opt_debug, "debug"},
751 {Opt_oldalloc, "oldalloc"},
752 {Opt_orlov, "orlov"},
753 {Opt_user_xattr, "user_xattr"},
754 {Opt_nouser_xattr, "nouser_xattr"},
755 {Opt_acl, "acl"},
756 {Opt_noacl, "noacl"},
757 {Opt_reservation, "reservation"},
758 {Opt_noreservation, "noreservation"},
759 {Opt_noload, "noload"},
760 {Opt_nobh, "nobh"},
761 {Opt_bh, "bh"},
762 {Opt_commit, "commit=%u"},
763 {Opt_journal_update, "journal=update"},
764 {Opt_journal_inum, "journal=%u"},
765 {Opt_journal_dev, "journal_dev=%u"},
766 {Opt_abort, "abort"},
767 {Opt_data_journal, "data=journal"},
768 {Opt_data_ordered, "data=ordered"},
769 {Opt_data_writeback, "data=writeback"},
770 {Opt_offusrjquota, "usrjquota="},
771 {Opt_usrjquota, "usrjquota=%s"},
772 {Opt_offgrpjquota, "grpjquota="},
773 {Opt_grpjquota, "grpjquota=%s"},
774 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
775 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
776 {Opt_grpquota, "grpquota"},
777 {Opt_noquota, "noquota"},
778 {Opt_quota, "quota"},
779 {Opt_usrquota, "usrquota"},
780 {Opt_barrier, "barrier=%u"},
781 {Opt_extents, "extents"},
782 {Opt_err, NULL},
783 {Opt_resize, "resize"},
784 };
785
786 static ext4_fsblk_t get_sb_block(void **data)
787 {
788 ext4_fsblk_t sb_block;
789 char *options = (char *) *data;
790
791 if (!options || strncmp(options, "sb=", 3) != 0)
792 return 1; /* Default location */
793 options += 3;
794 /*todo: use simple_strtoll with >32bit ext4 */
795 sb_block = simple_strtoul(options, &options, 0);
796 if (*options && *options != ',') {
797 printk("EXT4-fs: Invalid sb specification: %s\n",
798 (char *) *data);
799 return 1;
800 }
801 if (*options == ',')
802 options++;
803 *data = (void *) options;
804 return sb_block;
805 }
806
807 static int parse_options (char *options, struct super_block *sb,
808 unsigned int *inum, unsigned long *journal_devnum,
809 ext4_fsblk_t *n_blocks_count, int is_remount)
810 {
811 struct ext4_sb_info *sbi = EXT4_SB(sb);
812 char * p;
813 substring_t args[MAX_OPT_ARGS];
814 int data_opt = 0;
815 int option;
816 #ifdef CONFIG_QUOTA
817 int qtype;
818 char *qname;
819 #endif
820
821 if (!options)
822 return 1;
823
824 while ((p = strsep (&options, ",")) != NULL) {
825 int token;
826 if (!*p)
827 continue;
828
829 token = match_token(p, tokens, args);
830 switch (token) {
831 case Opt_bsd_df:
832 clear_opt (sbi->s_mount_opt, MINIX_DF);
833 break;
834 case Opt_minix_df:
835 set_opt (sbi->s_mount_opt, MINIX_DF);
836 break;
837 case Opt_grpid:
838 set_opt (sbi->s_mount_opt, GRPID);
839 break;
840 case Opt_nogrpid:
841 clear_opt (sbi->s_mount_opt, GRPID);
842 break;
843 case Opt_resuid:
844 if (match_int(&args[0], &option))
845 return 0;
846 sbi->s_resuid = option;
847 break;
848 case Opt_resgid:
849 if (match_int(&args[0], &option))
850 return 0;
851 sbi->s_resgid = option;
852 break;
853 case Opt_sb:
854 /* handled by get_sb_block() instead of here */
855 /* *sb_block = match_int(&args[0]); */
856 break;
857 case Opt_err_panic:
858 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
859 clear_opt (sbi->s_mount_opt, ERRORS_RO);
860 set_opt (sbi->s_mount_opt, ERRORS_PANIC);
861 break;
862 case Opt_err_ro:
863 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
864 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
865 set_opt (sbi->s_mount_opt, ERRORS_RO);
866 break;
867 case Opt_err_cont:
868 clear_opt (sbi->s_mount_opt, ERRORS_RO);
869 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
870 set_opt (sbi->s_mount_opt, ERRORS_CONT);
871 break;
872 case Opt_nouid32:
873 set_opt (sbi->s_mount_opt, NO_UID32);
874 break;
875 case Opt_nocheck:
876 clear_opt (sbi->s_mount_opt, CHECK);
877 break;
878 case Opt_debug:
879 set_opt (sbi->s_mount_opt, DEBUG);
880 break;
881 case Opt_oldalloc:
882 set_opt (sbi->s_mount_opt, OLDALLOC);
883 break;
884 case Opt_orlov:
885 clear_opt (sbi->s_mount_opt, OLDALLOC);
886 break;
887 #ifdef CONFIG_EXT4DEV_FS_XATTR
888 case Opt_user_xattr:
889 set_opt (sbi->s_mount_opt, XATTR_USER);
890 break;
891 case Opt_nouser_xattr:
892 clear_opt (sbi->s_mount_opt, XATTR_USER);
893 break;
894 #else
895 case Opt_user_xattr:
896 case Opt_nouser_xattr:
897 printk("EXT4 (no)user_xattr options not supported\n");
898 break;
899 #endif
900 #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
901 case Opt_acl:
902 set_opt(sbi->s_mount_opt, POSIX_ACL);
903 break;
904 case Opt_noacl:
905 clear_opt(sbi->s_mount_opt, POSIX_ACL);
906 break;
907 #else
908 case Opt_acl:
909 case Opt_noacl:
910 printk("EXT4 (no)acl options not supported\n");
911 break;
912 #endif
913 case Opt_reservation:
914 set_opt(sbi->s_mount_opt, RESERVATION);
915 break;
916 case Opt_noreservation:
917 clear_opt(sbi->s_mount_opt, RESERVATION);
918 break;
919 case Opt_journal_update:
920 /* @@@ FIXME */
921 /* Eventually we will want to be able to create
922 a journal file here. For now, only allow the
923 user to specify an existing inode to be the
924 journal file. */
925 if (is_remount) {
926 printk(KERN_ERR "EXT4-fs: cannot specify "
927 "journal on remount\n");
928 return 0;
929 }
930 set_opt (sbi->s_mount_opt, UPDATE_JOURNAL);
931 break;
932 case Opt_journal_inum:
933 if (is_remount) {
934 printk(KERN_ERR "EXT4-fs: cannot specify "
935 "journal on remount\n");
936 return 0;
937 }
938 if (match_int(&args[0], &option))
939 return 0;
940 *inum = option;
941 break;
942 case Opt_journal_dev:
943 if (is_remount) {
944 printk(KERN_ERR "EXT4-fs: cannot specify "
945 "journal on remount\n");
946 return 0;
947 }
948 if (match_int(&args[0], &option))
949 return 0;
950 *journal_devnum = option;
951 break;
952 case Opt_noload:
953 set_opt (sbi->s_mount_opt, NOLOAD);
954 break;
955 case Opt_commit:
956 if (match_int(&args[0], &option))
957 return 0;
958 if (option < 0)
959 return 0;
960 if (option == 0)
961 option = JBD_DEFAULT_MAX_COMMIT_AGE;
962 sbi->s_commit_interval = HZ * option;
963 break;
964 case Opt_data_journal:
965 data_opt = EXT4_MOUNT_JOURNAL_DATA;
966 goto datacheck;
967 case Opt_data_ordered:
968 data_opt = EXT4_MOUNT_ORDERED_DATA;
969 goto datacheck;
970 case Opt_data_writeback:
971 data_opt = EXT4_MOUNT_WRITEBACK_DATA;
972 datacheck:
973 if (is_remount) {
974 if ((sbi->s_mount_opt & EXT4_MOUNT_DATA_FLAGS)
975 != data_opt) {
976 printk(KERN_ERR
977 "EXT4-fs: cannot change data "
978 "mode on remount\n");
979 return 0;
980 }
981 } else {
982 sbi->s_mount_opt &= ~EXT4_MOUNT_DATA_FLAGS;
983 sbi->s_mount_opt |= data_opt;
984 }
985 break;
986 #ifdef CONFIG_QUOTA
987 case Opt_usrjquota:
988 qtype = USRQUOTA;
989 goto set_qf_name;
990 case Opt_grpjquota:
991 qtype = GRPQUOTA;
992 set_qf_name:
993 if (sb_any_quota_enabled(sb)) {
994 printk(KERN_ERR
995 "EXT4-fs: Cannot change journalled "
996 "quota options when quota turned on.\n");
997 return 0;
998 }
999 qname = match_strdup(&args[0]);
1000 if (!qname) {
1001 printk(KERN_ERR
1002 "EXT4-fs: not enough memory for "
1003 "storing quotafile name.\n");
1004 return 0;
1005 }
1006 if (sbi->s_qf_names[qtype] &&
1007 strcmp(sbi->s_qf_names[qtype], qname)) {
1008 printk(KERN_ERR
1009 "EXT4-fs: %s quota file already "
1010 "specified.\n", QTYPE2NAME(qtype));
1011 kfree(qname);
1012 return 0;
1013 }
1014 sbi->s_qf_names[qtype] = qname;
1015 if (strchr(sbi->s_qf_names[qtype], '/')) {
1016 printk(KERN_ERR
1017 "EXT4-fs: quotafile must be on "
1018 "filesystem root.\n");
1019 kfree(sbi->s_qf_names[qtype]);
1020 sbi->s_qf_names[qtype] = NULL;
1021 return 0;
1022 }
1023 set_opt(sbi->s_mount_opt, QUOTA);
1024 break;
1025 case Opt_offusrjquota:
1026 qtype = USRQUOTA;
1027 goto clear_qf_name;
1028 case Opt_offgrpjquota:
1029 qtype = GRPQUOTA;
1030 clear_qf_name:
1031 if (sb_any_quota_enabled(sb)) {
1032 printk(KERN_ERR "EXT4-fs: Cannot change "
1033 "journalled quota options when "
1034 "quota turned on.\n");
1035 return 0;
1036 }
1037 /*
1038 * The space will be released later when all options
1039 * are confirmed to be correct
1040 */
1041 sbi->s_qf_names[qtype] = NULL;
1042 break;
1043 case Opt_jqfmt_vfsold:
1044 sbi->s_jquota_fmt = QFMT_VFS_OLD;
1045 break;
1046 case Opt_jqfmt_vfsv0:
1047 sbi->s_jquota_fmt = QFMT_VFS_V0;
1048 break;
1049 case Opt_quota:
1050 case Opt_usrquota:
1051 set_opt(sbi->s_mount_opt, QUOTA);
1052 set_opt(sbi->s_mount_opt, USRQUOTA);
1053 break;
1054 case Opt_grpquota:
1055 set_opt(sbi->s_mount_opt, QUOTA);
1056 set_opt(sbi->s_mount_opt, GRPQUOTA);
1057 break;
1058 case Opt_noquota:
1059 if (sb_any_quota_enabled(sb)) {
1060 printk(KERN_ERR "EXT4-fs: Cannot change quota "
1061 "options when quota turned on.\n");
1062 return 0;
1063 }
1064 clear_opt(sbi->s_mount_opt, QUOTA);
1065 clear_opt(sbi->s_mount_opt, USRQUOTA);
1066 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1067 break;
1068 #else
1069 case Opt_quota:
1070 case Opt_usrquota:
1071 case Opt_grpquota:
1072 case Opt_usrjquota:
1073 case Opt_grpjquota:
1074 case Opt_offusrjquota:
1075 case Opt_offgrpjquota:
1076 case Opt_jqfmt_vfsold:
1077 case Opt_jqfmt_vfsv0:
1078 printk(KERN_ERR
1079 "EXT4-fs: journalled quota options not "
1080 "supported.\n");
1081 break;
1082 case Opt_noquota:
1083 break;
1084 #endif
1085 case Opt_abort:
1086 set_opt(sbi->s_mount_opt, ABORT);
1087 break;
1088 case Opt_barrier:
1089 if (match_int(&args[0], &option))
1090 return 0;
1091 if (option)
1092 set_opt(sbi->s_mount_opt, BARRIER);
1093 else
1094 clear_opt(sbi->s_mount_opt, BARRIER);
1095 break;
1096 case Opt_ignore:
1097 break;
1098 case Opt_resize:
1099 if (!is_remount) {
1100 printk("EXT4-fs: resize option only available "
1101 "for remount\n");
1102 return 0;
1103 }
1104 if (match_int(&args[0], &option) != 0)
1105 return 0;
1106 *n_blocks_count = option;
1107 break;
1108 case Opt_nobh:
1109 set_opt(sbi->s_mount_opt, NOBH);
1110 break;
1111 case Opt_bh:
1112 clear_opt(sbi->s_mount_opt, NOBH);
1113 break;
1114 case Opt_extents:
1115 set_opt (sbi->s_mount_opt, EXTENTS);
1116 break;
1117 default:
1118 printk (KERN_ERR
1119 "EXT4-fs: Unrecognized mount option \"%s\" "
1120 "or missing value\n", p);
1121 return 0;
1122 }
1123 }
1124 #ifdef CONFIG_QUOTA
1125 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1126 if ((sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA) &&
1127 sbi->s_qf_names[USRQUOTA])
1128 clear_opt(sbi->s_mount_opt, USRQUOTA);
1129
1130 if ((sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA) &&
1131 sbi->s_qf_names[GRPQUOTA])
1132 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1133
1134 if ((sbi->s_qf_names[USRQUOTA] &&
1135 (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)) ||
1136 (sbi->s_qf_names[GRPQUOTA] &&
1137 (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA))) {
1138 printk(KERN_ERR "EXT4-fs: old and new quota "
1139 "format mixing.\n");
1140 return 0;
1141 }
1142
1143 if (!sbi->s_jquota_fmt) {
1144 printk(KERN_ERR "EXT4-fs: journalled quota format "
1145 "not specified.\n");
1146 return 0;
1147 }
1148 } else {
1149 if (sbi->s_jquota_fmt) {
1150 printk(KERN_ERR "EXT4-fs: journalled quota format "
1151 "specified with no journalling "
1152 "enabled.\n");
1153 return 0;
1154 }
1155 }
1156 #endif
1157 return 1;
1158 }
1159
1160 static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
1161 int read_only)
1162 {
1163 struct ext4_sb_info *sbi = EXT4_SB(sb);
1164 int res = 0;
1165
1166 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
1167 printk (KERN_ERR "EXT4-fs warning: revision level too high, "
1168 "forcing read-only mode\n");
1169 res = MS_RDONLY;
1170 }
1171 if (read_only)
1172 return res;
1173 if (!(sbi->s_mount_state & EXT4_VALID_FS))
1174 printk (KERN_WARNING "EXT4-fs warning: mounting unchecked fs, "
1175 "running e2fsck is recommended\n");
1176 else if ((sbi->s_mount_state & EXT4_ERROR_FS))
1177 printk (KERN_WARNING
1178 "EXT4-fs warning: mounting fs with errors, "
1179 "running e2fsck is recommended\n");
1180 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
1181 le16_to_cpu(es->s_mnt_count) >=
1182 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
1183 printk (KERN_WARNING
1184 "EXT4-fs warning: maximal mount count reached, "
1185 "running e2fsck is recommended\n");
1186 else if (le32_to_cpu(es->s_checkinterval) &&
1187 (le32_to_cpu(es->s_lastcheck) +
1188 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1189 printk (KERN_WARNING
1190 "EXT4-fs warning: checktime reached, "
1191 "running e2fsck is recommended\n");
1192 #if 0
1193 /* @@@ We _will_ want to clear the valid bit if we find
1194 * inconsistencies, to force a fsck at reboot. But for
1195 * a plain journaled filesystem we can keep it set as
1196 * valid forever! :)
1197 */
1198 es->s_state = cpu_to_le16(le16_to_cpu(es->s_state) & ~EXT4_VALID_FS);
1199 #endif
1200 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
1201 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
1202 es->s_mnt_count=cpu_to_le16(le16_to_cpu(es->s_mnt_count) + 1);
1203 es->s_mtime = cpu_to_le32(get_seconds());
1204 ext4_update_dynamic_rev(sb);
1205 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
1206
1207 ext4_commit_super(sb, es, 1);
1208 if (test_opt(sb, DEBUG))
1209 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%lu, "
1210 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
1211 sb->s_blocksize,
1212 sbi->s_groups_count,
1213 EXT4_BLOCKS_PER_GROUP(sb),
1214 EXT4_INODES_PER_GROUP(sb),
1215 sbi->s_mount_opt);
1216
1217 printk(KERN_INFO "EXT4 FS on %s, ", sb->s_id);
1218 if (EXT4_SB(sb)->s_journal->j_inode == NULL) {
1219 char b[BDEVNAME_SIZE];
1220
1221 printk("external journal on %s\n",
1222 bdevname(EXT4_SB(sb)->s_journal->j_dev, b));
1223 } else {
1224 printk("internal journal\n");
1225 }
1226 return res;
1227 }
1228
1229 /* Called at mount-time, super-block is locked */
1230 static int ext4_check_descriptors (struct super_block * sb)
1231 {
1232 struct ext4_sb_info *sbi = EXT4_SB(sb);
1233 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
1234 ext4_fsblk_t last_block;
1235 ext4_fsblk_t block_bitmap;
1236 ext4_fsblk_t inode_bitmap;
1237 ext4_fsblk_t inode_table;
1238 struct ext4_group_desc * gdp = NULL;
1239 int desc_block = 0;
1240 int i;
1241
1242 ext4_debug ("Checking group descriptors");
1243
1244 for (i = 0; i < sbi->s_groups_count; i++)
1245 {
1246 if (i == sbi->s_groups_count - 1)
1247 last_block = ext4_blocks_count(sbi->s_es) - 1;
1248 else
1249 last_block = first_block +
1250 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
1251
1252 if ((i % EXT4_DESC_PER_BLOCK(sb)) == 0)
1253 gdp = (struct ext4_group_desc *)
1254 sbi->s_group_desc[desc_block++]->b_data;
1255 block_bitmap = ext4_block_bitmap(sb, gdp);
1256 if (block_bitmap < first_block || block_bitmap > last_block)
1257 {
1258 ext4_error (sb, "ext4_check_descriptors",
1259 "Block bitmap for group %d"
1260 " not in group (block %llu)!",
1261 i, block_bitmap);
1262 return 0;
1263 }
1264 inode_bitmap = ext4_inode_bitmap(sb, gdp);
1265 if (inode_bitmap < first_block || inode_bitmap > last_block)
1266 {
1267 ext4_error (sb, "ext4_check_descriptors",
1268 "Inode bitmap for group %d"
1269 " not in group (block %llu)!",
1270 i, inode_bitmap);
1271 return 0;
1272 }
1273 inode_table = ext4_inode_table(sb, gdp);
1274 if (inode_table < first_block ||
1275 inode_table + sbi->s_itb_per_group > last_block)
1276 {
1277 ext4_error (sb, "ext4_check_descriptors",
1278 "Inode table for group %d"
1279 " not in group (block %llu)!",
1280 i, inode_table);
1281 return 0;
1282 }
1283 first_block += EXT4_BLOCKS_PER_GROUP(sb);
1284 gdp = (struct ext4_group_desc *)
1285 ((__u8 *)gdp + EXT4_DESC_SIZE(sb));
1286 }
1287
1288 ext4_free_blocks_count_set(sbi->s_es, ext4_count_free_blocks(sb));
1289 sbi->s_es->s_free_inodes_count=cpu_to_le32(ext4_count_free_inodes(sb));
1290 return 1;
1291 }
1292
1293
1294 /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
1295 * the superblock) which were deleted from all directories, but held open by
1296 * a process at the time of a crash. We walk the list and try to delete these
1297 * inodes at recovery time (only with a read-write filesystem).
1298 *
1299 * In order to keep the orphan inode chain consistent during traversal (in
1300 * case of crash during recovery), we link each inode into the superblock
1301 * orphan list_head and handle it the same way as an inode deletion during
1302 * normal operation (which journals the operations for us).
1303 *
1304 * We only do an iget() and an iput() on each inode, which is very safe if we
1305 * accidentally point at an in-use or already deleted inode. The worst that
1306 * can happen in this case is that we get a "bit already cleared" message from
1307 * ext4_free_inode(). The only reason we would point at a wrong inode is if
1308 * e2fsck was run on this filesystem, and it must have already done the orphan
1309 * inode cleanup for us, so we can safely abort without any further action.
1310 */
1311 static void ext4_orphan_cleanup (struct super_block * sb,
1312 struct ext4_super_block * es)
1313 {
1314 unsigned int s_flags = sb->s_flags;
1315 int nr_orphans = 0, nr_truncates = 0;
1316 #ifdef CONFIG_QUOTA
1317 int i;
1318 #endif
1319 if (!es->s_last_orphan) {
1320 jbd_debug(4, "no orphan inodes to clean up\n");
1321 return;
1322 }
1323
1324 if (bdev_read_only(sb->s_bdev)) {
1325 printk(KERN_ERR "EXT4-fs: write access "
1326 "unavailable, skipping orphan cleanup.\n");
1327 return;
1328 }
1329
1330 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
1331 if (es->s_last_orphan)
1332 jbd_debug(1, "Errors on filesystem, "
1333 "clearing orphan list.\n");
1334 es->s_last_orphan = 0;
1335 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1336 return;
1337 }
1338
1339 if (s_flags & MS_RDONLY) {
1340 printk(KERN_INFO "EXT4-fs: %s: orphan cleanup on readonly fs\n",
1341 sb->s_id);
1342 sb->s_flags &= ~MS_RDONLY;
1343 }
1344 #ifdef CONFIG_QUOTA
1345 /* Needed for iput() to work correctly and not trash data */
1346 sb->s_flags |= MS_ACTIVE;
1347 /* Turn on quotas so that they are updated correctly */
1348 for (i = 0; i < MAXQUOTAS; i++) {
1349 if (EXT4_SB(sb)->s_qf_names[i]) {
1350 int ret = ext4_quota_on_mount(sb, i);
1351 if (ret < 0)
1352 printk(KERN_ERR
1353 "EXT4-fs: Cannot turn on journalled "
1354 "quota: error %d\n", ret);
1355 }
1356 }
1357 #endif
1358
1359 while (es->s_last_orphan) {
1360 struct inode *inode;
1361
1362 if (!(inode =
1363 ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan)))) {
1364 es->s_last_orphan = 0;
1365 break;
1366 }
1367
1368 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
1369 DQUOT_INIT(inode);
1370 if (inode->i_nlink) {
1371 printk(KERN_DEBUG
1372 "%s: truncating inode %lu to %Ld bytes\n",
1373 __FUNCTION__, inode->i_ino, inode->i_size);
1374 jbd_debug(2, "truncating inode %lu to %Ld bytes\n",
1375 inode->i_ino, inode->i_size);
1376 ext4_truncate(inode);
1377 nr_truncates++;
1378 } else {
1379 printk(KERN_DEBUG
1380 "%s: deleting unreferenced inode %lu\n",
1381 __FUNCTION__, inode->i_ino);
1382 jbd_debug(2, "deleting unreferenced inode %lu\n",
1383 inode->i_ino);
1384 nr_orphans++;
1385 }
1386 iput(inode); /* The delete magic happens here! */
1387 }
1388
1389 #define PLURAL(x) (x), ((x)==1) ? "" : "s"
1390
1391 if (nr_orphans)
1392 printk(KERN_INFO "EXT4-fs: %s: %d orphan inode%s deleted\n",
1393 sb->s_id, PLURAL(nr_orphans));
1394 if (nr_truncates)
1395 printk(KERN_INFO "EXT4-fs: %s: %d truncate%s cleaned up\n",
1396 sb->s_id, PLURAL(nr_truncates));
1397 #ifdef CONFIG_QUOTA
1398 /* Turn quotas off */
1399 for (i = 0; i < MAXQUOTAS; i++) {
1400 if (sb_dqopt(sb)->files[i])
1401 vfs_quota_off(sb, i);
1402 }
1403 #endif
1404 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1405 }
1406
1407 #define log2(n) ffz(~(n))
1408
1409 /*
1410 * Maximal file size. There is a direct, and {,double-,triple-}indirect
1411 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
1412 * We need to be 1 filesystem block less than the 2^32 sector limit.
1413 */
1414 static loff_t ext4_max_size(int bits)
1415 {
1416 loff_t res = EXT4_NDIR_BLOCKS;
1417 /* This constant is calculated to be the largest file size for a
1418 * dense, 4k-blocksize file such that the total number of
1419 * sectors in the file, including data and all indirect blocks,
1420 * does not exceed 2^32. */
1421 const loff_t upper_limit = 0x1ff7fffd000LL;
1422
1423 res += 1LL << (bits-2);
1424 res += 1LL << (2*(bits-2));
1425 res += 1LL << (3*(bits-2));
1426 res <<= bits;
1427 if (res > upper_limit)
1428 res = upper_limit;
1429 return res;
1430 }
1431
1432 static ext4_fsblk_t descriptor_loc(struct super_block *sb,
1433 ext4_fsblk_t logical_sb_block, int nr)
1434 {
1435 struct ext4_sb_info *sbi = EXT4_SB(sb);
1436 unsigned long bg, first_meta_bg;
1437 int has_super = 0;
1438
1439 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1440
1441 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
1442 nr < first_meta_bg)
1443 return logical_sb_block + nr + 1;
1444 bg = sbi->s_desc_per_block * nr;
1445 if (ext4_bg_has_super(sb, bg))
1446 has_super = 1;
1447 return (has_super + ext4_group_first_block_no(sb, bg));
1448 }
1449
1450
1451 static int ext4_fill_super (struct super_block *sb, void *data, int silent)
1452 {
1453 struct buffer_head * bh;
1454 struct ext4_super_block *es = NULL;
1455 struct ext4_sb_info *sbi;
1456 ext4_fsblk_t block;
1457 ext4_fsblk_t sb_block = get_sb_block(&data);
1458 ext4_fsblk_t logical_sb_block;
1459 unsigned long offset = 0;
1460 unsigned int journal_inum = 0;
1461 unsigned long journal_devnum = 0;
1462 unsigned long def_mount_opts;
1463 struct inode *root;
1464 int blocksize;
1465 int hblock;
1466 int db_count;
1467 int i;
1468 int needs_recovery;
1469 __le32 features;
1470 __u64 blocks_count;
1471
1472 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
1473 if (!sbi)
1474 return -ENOMEM;
1475 sb->s_fs_info = sbi;
1476 sbi->s_mount_opt = 0;
1477 sbi->s_resuid = EXT4_DEF_RESUID;
1478 sbi->s_resgid = EXT4_DEF_RESGID;
1479
1480 unlock_kernel();
1481
1482 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
1483 if (!blocksize) {
1484 printk(KERN_ERR "EXT4-fs: unable to set blocksize\n");
1485 goto out_fail;
1486 }
1487
1488 /*
1489 * The ext4 superblock will not be buffer aligned for other than 1kB
1490 * block sizes. We need to calculate the offset from buffer start.
1491 */
1492 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
1493 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
1494 offset = do_div(logical_sb_block, blocksize);
1495 } else {
1496 logical_sb_block = sb_block;
1497 }
1498
1499 if (!(bh = sb_bread(sb, logical_sb_block))) {
1500 printk (KERN_ERR "EXT4-fs: unable to read superblock\n");
1501 goto out_fail;
1502 }
1503 /*
1504 * Note: s_es must be initialized as soon as possible because
1505 * some ext4 macro-instructions depend on its value
1506 */
1507 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
1508 sbi->s_es = es;
1509 sb->s_magic = le16_to_cpu(es->s_magic);
1510 if (sb->s_magic != EXT4_SUPER_MAGIC)
1511 goto cantfind_ext4;
1512
1513 /* Set defaults before we parse the mount options */
1514 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
1515 if (def_mount_opts & EXT4_DEFM_DEBUG)
1516 set_opt(sbi->s_mount_opt, DEBUG);
1517 if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
1518 set_opt(sbi->s_mount_opt, GRPID);
1519 if (def_mount_opts & EXT4_DEFM_UID16)
1520 set_opt(sbi->s_mount_opt, NO_UID32);
1521 #ifdef CONFIG_EXT4DEV_FS_XATTR
1522 if (def_mount_opts & EXT4_DEFM_XATTR_USER)
1523 set_opt(sbi->s_mount_opt, XATTR_USER);
1524 #endif
1525 #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
1526 if (def_mount_opts & EXT4_DEFM_ACL)
1527 set_opt(sbi->s_mount_opt, POSIX_ACL);
1528 #endif
1529 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
1530 sbi->s_mount_opt |= EXT4_MOUNT_JOURNAL_DATA;
1531 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
1532 sbi->s_mount_opt |= EXT4_MOUNT_ORDERED_DATA;
1533 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
1534 sbi->s_mount_opt |= EXT4_MOUNT_WRITEBACK_DATA;
1535
1536 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
1537 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1538 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_RO)
1539 set_opt(sbi->s_mount_opt, ERRORS_RO);
1540 else
1541 set_opt(sbi->s_mount_opt, ERRORS_CONT);
1542
1543 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
1544 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
1545
1546 set_opt(sbi->s_mount_opt, RESERVATION);
1547
1548 if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
1549 NULL, 0))
1550 goto failed_mount;
1551
1552 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1553 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
1554
1555 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
1556 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
1557 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
1558 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
1559 printk(KERN_WARNING
1560 "EXT4-fs warning: feature flags set on rev 0 fs, "
1561 "running e2fsck is recommended\n");
1562 /*
1563 * Check feature flags regardless of the revision level, since we
1564 * previously didn't change the revision level when setting the flags,
1565 * so there is a chance incompat flags are set on a rev 0 filesystem.
1566 */
1567 features = EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP);
1568 if (features) {
1569 printk(KERN_ERR "EXT4-fs: %s: couldn't mount because of "
1570 "unsupported optional features (%x).\n",
1571 sb->s_id, le32_to_cpu(features));
1572 goto failed_mount;
1573 }
1574 features = EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP);
1575 if (!(sb->s_flags & MS_RDONLY) && features) {
1576 printk(KERN_ERR "EXT4-fs: %s: couldn't mount RDWR because of "
1577 "unsupported optional features (%x).\n",
1578 sb->s_id, le32_to_cpu(features));
1579 goto failed_mount;
1580 }
1581 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
1582
1583 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
1584 blocksize > EXT4_MAX_BLOCK_SIZE) {
1585 printk(KERN_ERR
1586 "EXT4-fs: Unsupported filesystem blocksize %d on %s.\n",
1587 blocksize, sb->s_id);
1588 goto failed_mount;
1589 }
1590
1591 hblock = bdev_hardsect_size(sb->s_bdev);
1592 if (sb->s_blocksize != blocksize) {
1593 /*
1594 * Make sure the blocksize for the filesystem is larger
1595 * than the hardware sectorsize for the machine.
1596 */
1597 if (blocksize < hblock) {
1598 printk(KERN_ERR "EXT4-fs: blocksize %d too small for "
1599 "device blocksize %d.\n", blocksize, hblock);
1600 goto failed_mount;
1601 }
1602
1603 brelse (bh);
1604 sb_set_blocksize(sb, blocksize);
1605 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
1606 offset = do_div(logical_sb_block, blocksize);
1607 bh = sb_bread(sb, logical_sb_block);
1608 if (!bh) {
1609 printk(KERN_ERR
1610 "EXT4-fs: Can't read superblock on 2nd try.\n");
1611 goto failed_mount;
1612 }
1613 es = (struct ext4_super_block *)(((char *)bh->b_data) + offset);
1614 sbi->s_es = es;
1615 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
1616 printk (KERN_ERR
1617 "EXT4-fs: Magic mismatch, very weird !\n");
1618 goto failed_mount;
1619 }
1620 }
1621
1622 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits);
1623
1624 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
1625 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
1626 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
1627 } else {
1628 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
1629 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
1630 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
1631 (sbi->s_inode_size & (sbi->s_inode_size - 1)) ||
1632 (sbi->s_inode_size > blocksize)) {
1633 printk (KERN_ERR
1634 "EXT4-fs: unsupported inode size: %d\n",
1635 sbi->s_inode_size);
1636 goto failed_mount;
1637 }
1638 }
1639 sbi->s_frag_size = EXT4_MIN_FRAG_SIZE <<
1640 le32_to_cpu(es->s_log_frag_size);
1641 if (blocksize != sbi->s_frag_size) {
1642 printk(KERN_ERR
1643 "EXT4-fs: fragsize %lu != blocksize %u (unsupported)\n",
1644 sbi->s_frag_size, blocksize);
1645 goto failed_mount;
1646 }
1647 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
1648 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
1649 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
1650 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
1651 sbi->s_desc_size & (sbi->s_desc_size - 1)) {
1652 printk(KERN_ERR
1653 "EXT4-fs: unsupported descriptor size %lu\n",
1654 sbi->s_desc_size);
1655 goto failed_mount;
1656 }
1657 } else
1658 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
1659 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
1660 sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
1661 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
1662 if (EXT4_INODE_SIZE(sb) == 0)
1663 goto cantfind_ext4;
1664 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
1665 if (sbi->s_inodes_per_block == 0)
1666 goto cantfind_ext4;
1667 sbi->s_itb_per_group = sbi->s_inodes_per_group /
1668 sbi->s_inodes_per_block;
1669 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
1670 sbi->s_sbh = bh;
1671 sbi->s_mount_state = le16_to_cpu(es->s_state);
1672 sbi->s_addr_per_block_bits = log2(EXT4_ADDR_PER_BLOCK(sb));
1673 sbi->s_desc_per_block_bits = log2(EXT4_DESC_PER_BLOCK(sb));
1674 for (i=0; i < 4; i++)
1675 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
1676 sbi->s_def_hash_version = es->s_def_hash_version;
1677
1678 if (sbi->s_blocks_per_group > blocksize * 8) {
1679 printk (KERN_ERR
1680 "EXT4-fs: #blocks per group too big: %lu\n",
1681 sbi->s_blocks_per_group);
1682 goto failed_mount;
1683 }
1684 if (sbi->s_frags_per_group > blocksize * 8) {
1685 printk (KERN_ERR
1686 "EXT4-fs: #fragments per group too big: %lu\n",
1687 sbi->s_frags_per_group);
1688 goto failed_mount;
1689 }
1690 if (sbi->s_inodes_per_group > blocksize * 8) {
1691 printk (KERN_ERR
1692 "EXT4-fs: #inodes per group too big: %lu\n",
1693 sbi->s_inodes_per_group);
1694 goto failed_mount;
1695 }
1696
1697 if (ext4_blocks_count(es) >
1698 (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) {
1699 printk(KERN_ERR "EXT4-fs: filesystem on %s:"
1700 " too large to mount safely\n", sb->s_id);
1701 if (sizeof(sector_t) < 8)
1702 printk(KERN_WARNING "EXT4-fs: CONFIG_LBD not "
1703 "enabled\n");
1704 goto failed_mount;
1705 }
1706
1707 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
1708 goto cantfind_ext4;
1709 blocks_count = (ext4_blocks_count(es) -
1710 le32_to_cpu(es->s_first_data_block) +
1711 EXT4_BLOCKS_PER_GROUP(sb) - 1);
1712 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
1713 sbi->s_groups_count = blocks_count;
1714 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
1715 EXT4_DESC_PER_BLOCK(sb);
1716 sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
1717 GFP_KERNEL);
1718 if (sbi->s_group_desc == NULL) {
1719 printk (KERN_ERR "EXT4-fs: not enough memory\n");
1720 goto failed_mount;
1721 }
1722
1723 bgl_lock_init(&sbi->s_blockgroup_lock);
1724
1725 for (i = 0; i < db_count; i++) {
1726 block = descriptor_loc(sb, logical_sb_block, i);
1727 sbi->s_group_desc[i] = sb_bread(sb, block);
1728 if (!sbi->s_group_desc[i]) {
1729 printk (KERN_ERR "EXT4-fs: "
1730 "can't read group descriptor %d\n", i);
1731 db_count = i;
1732 goto failed_mount2;
1733 }
1734 }
1735 if (!ext4_check_descriptors (sb)) {
1736 printk(KERN_ERR "EXT4-fs: group descriptors corrupted!\n");
1737 goto failed_mount2;
1738 }
1739 sbi->s_gdb_count = db_count;
1740 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1741 spin_lock_init(&sbi->s_next_gen_lock);
1742
1743 percpu_counter_init(&sbi->s_freeblocks_counter,
1744 ext4_count_free_blocks(sb));
1745 percpu_counter_init(&sbi->s_freeinodes_counter,
1746 ext4_count_free_inodes(sb));
1747 percpu_counter_init(&sbi->s_dirs_counter,
1748 ext4_count_dirs(sb));
1749
1750 /* per fileystem reservation list head & lock */
1751 spin_lock_init(&sbi->s_rsv_window_lock);
1752 sbi->s_rsv_window_root = RB_ROOT;
1753 /* Add a single, static dummy reservation to the start of the
1754 * reservation window list --- it gives us a placeholder for
1755 * append-at-start-of-list which makes the allocation logic
1756 * _much_ simpler. */
1757 sbi->s_rsv_window_head.rsv_start = EXT4_RESERVE_WINDOW_NOT_ALLOCATED;
1758 sbi->s_rsv_window_head.rsv_end = EXT4_RESERVE_WINDOW_NOT_ALLOCATED;
1759 sbi->s_rsv_window_head.rsv_alloc_hit = 0;
1760 sbi->s_rsv_window_head.rsv_goal_size = 0;
1761 ext4_rsv_window_add(sb, &sbi->s_rsv_window_head);
1762
1763 /*
1764 * set up enough so that it can read an inode
1765 */
1766 sb->s_op = &ext4_sops;
1767 sb->s_export_op = &ext4_export_ops;
1768 sb->s_xattr = ext4_xattr_handlers;
1769 #ifdef CONFIG_QUOTA
1770 sb->s_qcop = &ext4_qctl_operations;
1771 sb->dq_op = &ext4_quota_operations;
1772 #endif
1773 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
1774
1775 sb->s_root = NULL;
1776
1777 needs_recovery = (es->s_last_orphan != 0 ||
1778 EXT4_HAS_INCOMPAT_FEATURE(sb,
1779 EXT4_FEATURE_INCOMPAT_RECOVER));
1780
1781 /*
1782 * The first inode we look at is the journal inode. Don't try
1783 * root first: it may be modified in the journal!
1784 */
1785 if (!test_opt(sb, NOLOAD) &&
1786 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
1787 if (ext4_load_journal(sb, es, journal_devnum))
1788 goto failed_mount3;
1789 } else if (journal_inum) {
1790 if (ext4_create_journal(sb, es, journal_inum))
1791 goto failed_mount3;
1792 } else {
1793 if (!silent)
1794 printk (KERN_ERR
1795 "ext4: No journal on filesystem on %s\n",
1796 sb->s_id);
1797 goto failed_mount3;
1798 }
1799
1800 /* We have now updated the journal if required, so we can
1801 * validate the data journaling mode. */
1802 switch (test_opt(sb, DATA_FLAGS)) {
1803 case 0:
1804 /* No mode set, assume a default based on the journal
1805 * capabilities: ORDERED_DATA if the journal can
1806 * cope, else JOURNAL_DATA
1807 */
1808 if (jbd2_journal_check_available_features
1809 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
1810 set_opt(sbi->s_mount_opt, ORDERED_DATA);
1811 else
1812 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
1813 break;
1814
1815 case EXT4_MOUNT_ORDERED_DATA:
1816 case EXT4_MOUNT_WRITEBACK_DATA:
1817 if (!jbd2_journal_check_available_features
1818 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
1819 printk(KERN_ERR "EXT4-fs: Journal does not support "
1820 "requested data journaling mode\n");
1821 goto failed_mount4;
1822 }
1823 default:
1824 break;
1825 }
1826
1827 if (test_opt(sb, NOBH)) {
1828 if (!(test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)) {
1829 printk(KERN_WARNING "EXT4-fs: Ignoring nobh option - "
1830 "its supported only with writeback mode\n");
1831 clear_opt(sbi->s_mount_opt, NOBH);
1832 }
1833 }
1834 /*
1835 * The jbd2_journal_load will have done any necessary log recovery,
1836 * so we can safely mount the rest of the filesystem now.
1837 */
1838
1839 root = iget(sb, EXT4_ROOT_INO);
1840 sb->s_root = d_alloc_root(root);
1841 if (!sb->s_root) {
1842 printk(KERN_ERR "EXT4-fs: get root inode failed\n");
1843 iput(root);
1844 goto failed_mount4;
1845 }
1846 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1847 dput(sb->s_root);
1848 sb->s_root = NULL;
1849 printk(KERN_ERR "EXT4-fs: corrupt root inode, run e2fsck\n");
1850 goto failed_mount4;
1851 }
1852
1853 ext4_setup_super (sb, es, sb->s_flags & MS_RDONLY);
1854 /*
1855 * akpm: core read_super() calls in here with the superblock locked.
1856 * That deadlocks, because orphan cleanup needs to lock the superblock
1857 * in numerous places. Here we just pop the lock - it's relatively
1858 * harmless, because we are now ready to accept write_super() requests,
1859 * and aviro says that's the only reason for hanging onto the
1860 * superblock lock.
1861 */
1862 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
1863 ext4_orphan_cleanup(sb, es);
1864 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
1865 if (needs_recovery)
1866 printk (KERN_INFO "EXT4-fs: recovery complete.\n");
1867 ext4_mark_recovery_complete(sb, es);
1868 printk (KERN_INFO "EXT4-fs: mounted filesystem with %s data mode.\n",
1869 test_opt(sb,DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA ? "journal":
1870 test_opt(sb,DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA ? "ordered":
1871 "writeback");
1872
1873 ext4_ext_init(sb);
1874
1875 lock_kernel();
1876 return 0;
1877
1878 cantfind_ext4:
1879 if (!silent)
1880 printk(KERN_ERR "VFS: Can't find ext4 filesystem on dev %s.\n",
1881 sb->s_id);
1882 goto failed_mount;
1883
1884 failed_mount4:
1885 jbd2_journal_destroy(sbi->s_journal);
1886 failed_mount3:
1887 percpu_counter_destroy(&sbi->s_freeblocks_counter);
1888 percpu_counter_destroy(&sbi->s_freeinodes_counter);
1889 percpu_counter_destroy(&sbi->s_dirs_counter);
1890 failed_mount2:
1891 for (i = 0; i < db_count; i++)
1892 brelse(sbi->s_group_desc[i]);
1893 kfree(sbi->s_group_desc);
1894 failed_mount:
1895 #ifdef CONFIG_QUOTA
1896 for (i = 0; i < MAXQUOTAS; i++)
1897 kfree(sbi->s_qf_names[i]);
1898 #endif
1899 ext4_blkdev_remove(sbi);
1900 brelse(bh);
1901 out_fail:
1902 sb->s_fs_info = NULL;
1903 kfree(sbi);
1904 lock_kernel();
1905 return -EINVAL;
1906 }
1907
1908 /*
1909 * Setup any per-fs journal parameters now. We'll do this both on
1910 * initial mount, once the journal has been initialised but before we've
1911 * done any recovery; and again on any subsequent remount.
1912 */
1913 static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
1914 {
1915 struct ext4_sb_info *sbi = EXT4_SB(sb);
1916
1917 if (sbi->s_commit_interval)
1918 journal->j_commit_interval = sbi->s_commit_interval;
1919 /* We could also set up an ext4-specific default for the commit
1920 * interval here, but for now we'll just fall back to the jbd
1921 * default. */
1922
1923 spin_lock(&journal->j_state_lock);
1924 if (test_opt(sb, BARRIER))
1925 journal->j_flags |= JBD2_BARRIER;
1926 else
1927 journal->j_flags &= ~JBD2_BARRIER;
1928 spin_unlock(&journal->j_state_lock);
1929 }
1930
1931 static journal_t *ext4_get_journal(struct super_block *sb,
1932 unsigned int journal_inum)
1933 {
1934 struct inode *journal_inode;
1935 journal_t *journal;
1936
1937 /* First, test for the existence of a valid inode on disk. Bad
1938 * things happen if we iget() an unused inode, as the subsequent
1939 * iput() will try to delete it. */
1940
1941 journal_inode = iget(sb, journal_inum);
1942 if (!journal_inode) {
1943 printk(KERN_ERR "EXT4-fs: no journal found.\n");
1944 return NULL;
1945 }
1946 if (!journal_inode->i_nlink) {
1947 make_bad_inode(journal_inode);
1948 iput(journal_inode);
1949 printk(KERN_ERR "EXT4-fs: journal inode is deleted.\n");
1950 return NULL;
1951 }
1952
1953 jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
1954 journal_inode, journal_inode->i_size);
1955 if (is_bad_inode(journal_inode) || !S_ISREG(journal_inode->i_mode)) {
1956 printk(KERN_ERR "EXT4-fs: invalid journal inode.\n");
1957 iput(journal_inode);
1958 return NULL;
1959 }
1960
1961 journal = jbd2_journal_init_inode(journal_inode);
1962 if (!journal) {
1963 printk(KERN_ERR "EXT4-fs: Could not load journal inode\n");
1964 iput(journal_inode);
1965 return NULL;
1966 }
1967 journal->j_private = sb;
1968 ext4_init_journal_params(sb, journal);
1969 return journal;
1970 }
1971
1972 static journal_t *ext4_get_dev_journal(struct super_block *sb,
1973 dev_t j_dev)
1974 {
1975 struct buffer_head * bh;
1976 journal_t *journal;
1977 ext4_fsblk_t start;
1978 ext4_fsblk_t len;
1979 int hblock, blocksize;
1980 ext4_fsblk_t sb_block;
1981 unsigned long offset;
1982 struct ext4_super_block * es;
1983 struct block_device *bdev;
1984
1985 bdev = ext4_blkdev_get(j_dev);
1986 if (bdev == NULL)
1987 return NULL;
1988
1989 if (bd_claim(bdev, sb)) {
1990 printk(KERN_ERR
1991 "EXT4: failed to claim external journal device.\n");
1992 blkdev_put(bdev);
1993 return NULL;
1994 }
1995
1996 blocksize = sb->s_blocksize;
1997 hblock = bdev_hardsect_size(bdev);
1998 if (blocksize < hblock) {
1999 printk(KERN_ERR
2000 "EXT4-fs: blocksize too small for journal device.\n");
2001 goto out_bdev;
2002 }
2003
2004 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
2005 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
2006 set_blocksize(bdev, blocksize);
2007 if (!(bh = __bread(bdev, sb_block, blocksize))) {
2008 printk(KERN_ERR "EXT4-fs: couldn't read superblock of "
2009 "external journal\n");
2010 goto out_bdev;
2011 }
2012
2013 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
2014 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
2015 !(le32_to_cpu(es->s_feature_incompat) &
2016 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
2017 printk(KERN_ERR "EXT4-fs: external journal has "
2018 "bad superblock\n");
2019 brelse(bh);
2020 goto out_bdev;
2021 }
2022
2023 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
2024 printk(KERN_ERR "EXT4-fs: journal UUID does not match\n");
2025 brelse(bh);
2026 goto out_bdev;
2027 }
2028
2029 len = ext4_blocks_count(es);
2030 start = sb_block + 1;
2031 brelse(bh); /* we're done with the superblock */
2032
2033 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
2034 start, len, blocksize);
2035 if (!journal) {
2036 printk(KERN_ERR "EXT4-fs: failed to create device journal\n");
2037 goto out_bdev;
2038 }
2039 journal->j_private = sb;
2040 ll_rw_block(READ, 1, &journal->j_sb_buffer);
2041 wait_on_buffer(journal->j_sb_buffer);
2042 if (!buffer_uptodate(journal->j_sb_buffer)) {
2043 printk(KERN_ERR "EXT4-fs: I/O error on journal device\n");
2044 goto out_journal;
2045 }
2046 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
2047 printk(KERN_ERR "EXT4-fs: External journal has more than one "
2048 "user (unsupported) - %d\n",
2049 be32_to_cpu(journal->j_superblock->s_nr_users));
2050 goto out_journal;
2051 }
2052 EXT4_SB(sb)->journal_bdev = bdev;
2053 ext4_init_journal_params(sb, journal);
2054 return journal;
2055 out_journal:
2056 jbd2_journal_destroy(journal);
2057 out_bdev:
2058 ext4_blkdev_put(bdev);
2059 return NULL;
2060 }
2061
2062 static int ext4_load_journal(struct super_block *sb,
2063 struct ext4_super_block *es,
2064 unsigned long journal_devnum)
2065 {
2066 journal_t *journal;
2067 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
2068 dev_t journal_dev;
2069 int err = 0;
2070 int really_read_only;
2071
2072 if (journal_devnum &&
2073 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2074 printk(KERN_INFO "EXT4-fs: external journal device major/minor "
2075 "numbers have changed\n");
2076 journal_dev = new_decode_dev(journal_devnum);
2077 } else
2078 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
2079
2080 really_read_only = bdev_read_only(sb->s_bdev);
2081
2082 /*
2083 * Are we loading a blank journal or performing recovery after a
2084 * crash? For recovery, we need to check in advance whether we
2085 * can get read-write access to the device.
2086 */
2087
2088 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
2089 if (sb->s_flags & MS_RDONLY) {
2090 printk(KERN_INFO "EXT4-fs: INFO: recovery "
2091 "required on readonly filesystem.\n");
2092 if (really_read_only) {
2093 printk(KERN_ERR "EXT4-fs: write access "
2094 "unavailable, cannot proceed.\n");
2095 return -EROFS;
2096 }
2097 printk (KERN_INFO "EXT4-fs: write access will "
2098 "be enabled during recovery.\n");
2099 }
2100 }
2101
2102 if (journal_inum && journal_dev) {
2103 printk(KERN_ERR "EXT4-fs: filesystem has both journal "
2104 "and inode journals!\n");
2105 return -EINVAL;
2106 }
2107
2108 if (journal_inum) {
2109 if (!(journal = ext4_get_journal(sb, journal_inum)))
2110 return -EINVAL;
2111 } else {
2112 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
2113 return -EINVAL;
2114 }
2115
2116 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
2117 err = jbd2_journal_update_format(journal);
2118 if (err) {
2119 printk(KERN_ERR "EXT4-fs: error updating journal.\n");
2120 jbd2_journal_destroy(journal);
2121 return err;
2122 }
2123 }
2124
2125 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
2126 err = jbd2_journal_wipe(journal, !really_read_only);
2127 if (!err)
2128 err = jbd2_journal_load(journal);
2129
2130 if (err) {
2131 printk(KERN_ERR "EXT4-fs: error loading journal.\n");
2132 jbd2_journal_destroy(journal);
2133 return err;
2134 }
2135
2136 EXT4_SB(sb)->s_journal = journal;
2137 ext4_clear_journal_err(sb, es);
2138
2139 if (journal_devnum &&
2140 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2141 es->s_journal_dev = cpu_to_le32(journal_devnum);
2142 sb->s_dirt = 1;
2143
2144 /* Make sure we flush the recovery flag to disk. */
2145 ext4_commit_super(sb, es, 1);
2146 }
2147
2148 return 0;
2149 }
2150
2151 static int ext4_create_journal(struct super_block * sb,
2152 struct ext4_super_block * es,
2153 unsigned int journal_inum)
2154 {
2155 journal_t *journal;
2156
2157 if (sb->s_flags & MS_RDONLY) {
2158 printk(KERN_ERR "EXT4-fs: readonly filesystem when trying to "
2159 "create journal.\n");
2160 return -EROFS;
2161 }
2162
2163 if (!(journal = ext4_get_journal(sb, journal_inum)))
2164 return -EINVAL;
2165
2166 printk(KERN_INFO "EXT4-fs: creating new journal on inode %u\n",
2167 journal_inum);
2168
2169 if (jbd2_journal_create(journal)) {
2170 printk(KERN_ERR "EXT4-fs: error creating journal.\n");
2171 jbd2_journal_destroy(journal);
2172 return -EIO;
2173 }
2174
2175 EXT4_SB(sb)->s_journal = journal;
2176
2177 ext4_update_dynamic_rev(sb);
2178 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2179 EXT4_SET_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL);
2180
2181 es->s_journal_inum = cpu_to_le32(journal_inum);
2182 sb->s_dirt = 1;
2183
2184 /* Make sure we flush the recovery flag to disk. */
2185 ext4_commit_super(sb, es, 1);
2186
2187 return 0;
2188 }
2189
2190 static void ext4_commit_super (struct super_block * sb,
2191 struct ext4_super_block * es,
2192 int sync)
2193 {
2194 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
2195
2196 if (!sbh)
2197 return;
2198 es->s_wtime = cpu_to_le32(get_seconds());
2199 ext4_free_blocks_count_set(es, ext4_count_free_blocks(sb));
2200 es->s_free_inodes_count = cpu_to_le32(ext4_count_free_inodes(sb));
2201 BUFFER_TRACE(sbh, "marking dirty");
2202 mark_buffer_dirty(sbh);
2203 if (sync)
2204 sync_dirty_buffer(sbh);
2205 }
2206
2207
2208 /*
2209 * Have we just finished recovery? If so, and if we are mounting (or
2210 * remounting) the filesystem readonly, then we will end up with a
2211 * consistent fs on disk. Record that fact.
2212 */
2213 static void ext4_mark_recovery_complete(struct super_block * sb,
2214 struct ext4_super_block * es)
2215 {
2216 journal_t *journal = EXT4_SB(sb)->s_journal;
2217
2218 jbd2_journal_lock_updates(journal);
2219 jbd2_journal_flush(journal);
2220 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
2221 sb->s_flags & MS_RDONLY) {
2222 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2223 sb->s_dirt = 0;
2224 ext4_commit_super(sb, es, 1);
2225 }
2226 jbd2_journal_unlock_updates(journal);
2227 }
2228
2229 /*
2230 * If we are mounting (or read-write remounting) a filesystem whose journal
2231 * has recorded an error from a previous lifetime, move that error to the
2232 * main filesystem now.
2233 */
2234 static void ext4_clear_journal_err(struct super_block * sb,
2235 struct ext4_super_block * es)
2236 {
2237 journal_t *journal;
2238 int j_errno;
2239 const char *errstr;
2240
2241 journal = EXT4_SB(sb)->s_journal;
2242
2243 /*
2244 * Now check for any error status which may have been recorded in the
2245 * journal by a prior ext4_error() or ext4_abort()
2246 */
2247
2248 j_errno = jbd2_journal_errno(journal);
2249 if (j_errno) {
2250 char nbuf[16];
2251
2252 errstr = ext4_decode_error(sb, j_errno, nbuf);
2253 ext4_warning(sb, __FUNCTION__, "Filesystem error recorded "
2254 "from previous mount: %s", errstr);
2255 ext4_warning(sb, __FUNCTION__, "Marking fs in need of "
2256 "filesystem check.");
2257
2258 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
2259 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
2260 ext4_commit_super (sb, es, 1);
2261
2262 jbd2_journal_clear_err(journal);
2263 }
2264 }
2265
2266 /*
2267 * Force the running and committing transactions to commit,
2268 * and wait on the commit.
2269 */
2270 int ext4_force_commit(struct super_block *sb)
2271 {
2272 journal_t *journal;
2273 int ret;
2274
2275 if (sb->s_flags & MS_RDONLY)
2276 return 0;
2277
2278 journal = EXT4_SB(sb)->s_journal;
2279 sb->s_dirt = 0;
2280 ret = ext4_journal_force_commit(journal);
2281 return ret;
2282 }
2283
2284 /*
2285 * Ext4 always journals updates to the superblock itself, so we don't
2286 * have to propagate any other updates to the superblock on disk at this
2287 * point. Just start an async writeback to get the buffers on their way
2288 * to the disk.
2289 *
2290 * This implicitly triggers the writebehind on sync().
2291 */
2292
2293 static void ext4_write_super (struct super_block * sb)
2294 {
2295 if (mutex_trylock(&sb->s_lock) != 0)
2296 BUG();
2297 sb->s_dirt = 0;
2298 }
2299
2300 static int ext4_sync_fs(struct super_block *sb, int wait)
2301 {
2302 tid_t target;
2303
2304 sb->s_dirt = 0;
2305 if (jbd2_journal_start_commit(EXT4_SB(sb)->s_journal, &target)) {
2306 if (wait)
2307 jbd2_log_wait_commit(EXT4_SB(sb)->s_journal, target);
2308 }
2309 return 0;
2310 }
2311
2312 /*
2313 * LVM calls this function before a (read-only) snapshot is created. This
2314 * gives us a chance to flush the journal completely and mark the fs clean.
2315 */
2316 static void ext4_write_super_lockfs(struct super_block *sb)
2317 {
2318 sb->s_dirt = 0;
2319
2320 if (!(sb->s_flags & MS_RDONLY)) {
2321 journal_t *journal = EXT4_SB(sb)->s_journal;
2322
2323 /* Now we set up the journal barrier. */
2324 jbd2_journal_lock_updates(journal);
2325 jbd2_journal_flush(journal);
2326
2327 /* Journal blocked and flushed, clear needs_recovery flag. */
2328 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2329 ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1);
2330 }
2331 }
2332
2333 /*
2334 * Called by LVM after the snapshot is done. We need to reset the RECOVER
2335 * flag here, even though the filesystem is not technically dirty yet.
2336 */
2337 static void ext4_unlockfs(struct super_block *sb)
2338 {
2339 if (!(sb->s_flags & MS_RDONLY)) {
2340 lock_super(sb);
2341 /* Reser the needs_recovery flag before the fs is unlocked. */
2342 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2343 ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1);
2344 unlock_super(sb);
2345 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
2346 }
2347 }
2348
2349 static int ext4_remount (struct super_block * sb, int * flags, char * data)
2350 {
2351 struct ext4_super_block * es;
2352 struct ext4_sb_info *sbi = EXT4_SB(sb);
2353 ext4_fsblk_t n_blocks_count = 0;
2354 unsigned long old_sb_flags;
2355 struct ext4_mount_options old_opts;
2356 int err;
2357 #ifdef CONFIG_QUOTA
2358 int i;
2359 #endif
2360
2361 /* Store the original options */
2362 old_sb_flags = sb->s_flags;
2363 old_opts.s_mount_opt = sbi->s_mount_opt;
2364 old_opts.s_resuid = sbi->s_resuid;
2365 old_opts.s_resgid = sbi->s_resgid;
2366 old_opts.s_commit_interval = sbi->s_commit_interval;
2367 #ifdef CONFIG_QUOTA
2368 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
2369 for (i = 0; i < MAXQUOTAS; i++)
2370 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
2371 #endif
2372
2373 /*
2374 * Allow the "check" option to be passed as a remount option.
2375 */
2376 if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
2377 err = -EINVAL;
2378 goto restore_opts;
2379 }
2380
2381 if (sbi->s_mount_opt & EXT4_MOUNT_ABORT)
2382 ext4_abort(sb, __FUNCTION__, "Abort forced by user");
2383
2384 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
2385 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
2386
2387 es = sbi->s_es;
2388
2389 ext4_init_journal_params(sb, sbi->s_journal);
2390
2391 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
2392 n_blocks_count > ext4_blocks_count(es)) {
2393 if (sbi->s_mount_opt & EXT4_MOUNT_ABORT) {
2394 err = -EROFS;
2395 goto restore_opts;
2396 }
2397
2398 if (*flags & MS_RDONLY) {
2399 /*
2400 * First of all, the unconditional stuff we have to do
2401 * to disable replay of the journal when we next remount
2402 */
2403 sb->s_flags |= MS_RDONLY;
2404
2405 /*
2406 * OK, test if we are remounting a valid rw partition
2407 * readonly, and if so set the rdonly flag and then
2408 * mark the partition as valid again.
2409 */
2410 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
2411 (sbi->s_mount_state & EXT4_VALID_FS))
2412 es->s_state = cpu_to_le16(sbi->s_mount_state);
2413
2414 ext4_mark_recovery_complete(sb, es);
2415 } else {
2416 __le32 ret;
2417 if ((ret = EXT4_HAS_RO_COMPAT_FEATURE(sb,
2418 ~EXT4_FEATURE_RO_COMPAT_SUPP))) {
2419 printk(KERN_WARNING "EXT4-fs: %s: couldn't "
2420 "remount RDWR because of unsupported "
2421 "optional features (%x).\n",
2422 sb->s_id, le32_to_cpu(ret));
2423 err = -EROFS;
2424 goto restore_opts;
2425 }
2426 /*
2427 * Mounting a RDONLY partition read-write, so reread
2428 * and store the current valid flag. (It may have
2429 * been changed by e2fsck since we originally mounted
2430 * the partition.)
2431 */
2432 ext4_clear_journal_err(sb, es);
2433 sbi->s_mount_state = le16_to_cpu(es->s_state);
2434 if ((err = ext4_group_extend(sb, es, n_blocks_count)))
2435 goto restore_opts;
2436 if (!ext4_setup_super (sb, es, 0))
2437 sb->s_flags &= ~MS_RDONLY;
2438 }
2439 }
2440 #ifdef CONFIG_QUOTA
2441 /* Release old quota file names */
2442 for (i = 0; i < MAXQUOTAS; i++)
2443 if (old_opts.s_qf_names[i] &&
2444 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2445 kfree(old_opts.s_qf_names[i]);
2446 #endif
2447 return 0;
2448 restore_opts:
2449 sb->s_flags = old_sb_flags;
2450 sbi->s_mount_opt = old_opts.s_mount_opt;
2451 sbi->s_resuid = old_opts.s_resuid;
2452 sbi->s_resgid = old_opts.s_resgid;
2453 sbi->s_commit_interval = old_opts.s_commit_interval;
2454 #ifdef CONFIG_QUOTA
2455 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
2456 for (i = 0; i < MAXQUOTAS; i++) {
2457 if (sbi->s_qf_names[i] &&
2458 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2459 kfree(sbi->s_qf_names[i]);
2460 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
2461 }
2462 #endif
2463 return err;
2464 }
2465
2466 static int ext4_statfs (struct dentry * dentry, struct kstatfs * buf)
2467 {
2468 struct super_block *sb = dentry->d_sb;
2469 struct ext4_sb_info *sbi = EXT4_SB(sb);
2470 struct ext4_super_block *es = sbi->s_es;
2471 ext4_fsblk_t overhead;
2472 int i;
2473 u64 fsid;
2474
2475 if (test_opt (sb, MINIX_DF))
2476 overhead = 0;
2477 else {
2478 unsigned long ngroups;
2479 ngroups = EXT4_SB(sb)->s_groups_count;
2480 smp_rmb();
2481
2482 /*
2483 * Compute the overhead (FS structures)
2484 */
2485
2486 /*
2487 * All of the blocks before first_data_block are
2488 * overhead
2489 */
2490 overhead = le32_to_cpu(es->s_first_data_block);
2491
2492 /*
2493 * Add the overhead attributed to the superblock and
2494 * block group descriptors. If the sparse superblocks
2495 * feature is turned on, then not all groups have this.
2496 */
2497 for (i = 0; i < ngroups; i++) {
2498 overhead += ext4_bg_has_super(sb, i) +
2499 ext4_bg_num_gdb(sb, i);
2500 cond_resched();
2501 }
2502
2503 /*
2504 * Every block group has an inode bitmap, a block
2505 * bitmap, and an inode table.
2506 */
2507 overhead += (ngroups * (2 + EXT4_SB(sb)->s_itb_per_group));
2508 }
2509
2510 buf->f_type = EXT4_SUPER_MAGIC;
2511 buf->f_bsize = sb->s_blocksize;
2512 buf->f_blocks = ext4_blocks_count(es) - overhead;
2513 buf->f_bfree = percpu_counter_sum(&sbi->s_freeblocks_counter);
2514 buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es);
2515 if (buf->f_bfree < ext4_r_blocks_count(es))
2516 buf->f_bavail = 0;
2517 buf->f_files = le32_to_cpu(es->s_inodes_count);
2518 buf->f_ffree = percpu_counter_sum(&sbi->s_freeinodes_counter);
2519 buf->f_namelen = EXT4_NAME_LEN;
2520 fsid = le64_to_cpup((void *)es->s_uuid) ^
2521 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
2522 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
2523 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
2524 return 0;
2525 }
2526
2527 /* Helper function for writing quotas on sync - we need to start transaction before quota file
2528 * is locked for write. Otherwise the are possible deadlocks:
2529 * Process 1 Process 2
2530 * ext4_create() quota_sync()
2531 * jbd2_journal_start() write_dquot()
2532 * DQUOT_INIT() down(dqio_mutex)
2533 * down(dqio_mutex) jbd2_journal_start()
2534 *
2535 */
2536
2537 #ifdef CONFIG_QUOTA
2538
2539 static inline struct inode *dquot_to_inode(struct dquot *dquot)
2540 {
2541 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
2542 }
2543
2544 static int ext4_dquot_initialize(struct inode *inode, int type)
2545 {
2546 handle_t *handle;
2547 int ret, err;
2548
2549 /* We may create quota structure so we need to reserve enough blocks */
2550 handle = ext4_journal_start(inode, 2*EXT4_QUOTA_INIT_BLOCKS(inode->i_sb));
2551 if (IS_ERR(handle))
2552 return PTR_ERR(handle);
2553 ret = dquot_initialize(inode, type);
2554 err = ext4_journal_stop(handle);
2555 if (!ret)
2556 ret = err;
2557 return ret;
2558 }
2559
2560 static int ext4_dquot_drop(struct inode *inode)
2561 {
2562 handle_t *handle;
2563 int ret, err;
2564
2565 /* We may delete quota structure so we need to reserve enough blocks */
2566 handle = ext4_journal_start(inode, 2*EXT4_QUOTA_DEL_BLOCKS(inode->i_sb));
2567 if (IS_ERR(handle))
2568 return PTR_ERR(handle);
2569 ret = dquot_drop(inode);
2570 err = ext4_journal_stop(handle);
2571 if (!ret)
2572 ret = err;
2573 return ret;
2574 }
2575
2576 static int ext4_write_dquot(struct dquot *dquot)
2577 {
2578 int ret, err;
2579 handle_t *handle;
2580 struct inode *inode;
2581
2582 inode = dquot_to_inode(dquot);
2583 handle = ext4_journal_start(inode,
2584 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2585 if (IS_ERR(handle))
2586 return PTR_ERR(handle);
2587 ret = dquot_commit(dquot);
2588 err = ext4_journal_stop(handle);
2589 if (!ret)
2590 ret = err;
2591 return ret;
2592 }
2593
2594 static int ext4_acquire_dquot(struct dquot *dquot)
2595 {
2596 int ret, err;
2597 handle_t *handle;
2598
2599 handle = ext4_journal_start(dquot_to_inode(dquot),
2600 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2601 if (IS_ERR(handle))
2602 return PTR_ERR(handle);
2603 ret = dquot_acquire(dquot);
2604 err = ext4_journal_stop(handle);
2605 if (!ret)
2606 ret = err;
2607 return ret;
2608 }
2609
2610 static int ext4_release_dquot(struct dquot *dquot)
2611 {
2612 int ret, err;
2613 handle_t *handle;
2614
2615 handle = ext4_journal_start(dquot_to_inode(dquot),
2616 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2617 if (IS_ERR(handle))
2618 return PTR_ERR(handle);
2619 ret = dquot_release(dquot);
2620 err = ext4_journal_stop(handle);
2621 if (!ret)
2622 ret = err;
2623 return ret;
2624 }
2625
2626 static int ext4_mark_dquot_dirty(struct dquot *dquot)
2627 {
2628 /* Are we journalling quotas? */
2629 if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2630 EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2631 dquot_mark_dquot_dirty(dquot);
2632 return ext4_write_dquot(dquot);
2633 } else {
2634 return dquot_mark_dquot_dirty(dquot);
2635 }
2636 }
2637
2638 static int ext4_write_info(struct super_block *sb, int type)
2639 {
2640 int ret, err;
2641 handle_t *handle;
2642
2643 /* Data block + inode block */
2644 handle = ext4_journal_start(sb->s_root->d_inode, 2);
2645 if (IS_ERR(handle))
2646 return PTR_ERR(handle);
2647 ret = dquot_commit_info(sb, type);
2648 err = ext4_journal_stop(handle);
2649 if (!ret)
2650 ret = err;
2651 return ret;
2652 }
2653
2654 /*
2655 * Turn on quotas during mount time - we need to find
2656 * the quota file and such...
2657 */
2658 static int ext4_quota_on_mount(struct super_block *sb, int type)
2659 {
2660 return vfs_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
2661 EXT4_SB(sb)->s_jquota_fmt, type);
2662 }
2663
2664 /*
2665 * Standard function to be called on quota_on
2666 */
2667 static int ext4_quota_on(struct super_block *sb, int type, int format_id,
2668 char *path)
2669 {
2670 int err;
2671 struct nameidata nd;
2672
2673 if (!test_opt(sb, QUOTA))
2674 return -EINVAL;
2675 /* Not journalling quota? */
2676 if (!EXT4_SB(sb)->s_qf_names[USRQUOTA] &&
2677 !EXT4_SB(sb)->s_qf_names[GRPQUOTA])
2678 return vfs_quota_on(sb, type, format_id, path);
2679 err = path_lookup(path, LOOKUP_FOLLOW, &nd);
2680 if (err)
2681 return err;
2682 /* Quotafile not on the same filesystem? */
2683 if (nd.mnt->mnt_sb != sb) {
2684 path_release(&nd);
2685 return -EXDEV;
2686 }
2687 /* Quotafile not of fs root? */
2688 if (nd.dentry->d_parent->d_inode != sb->s_root->d_inode)
2689 printk(KERN_WARNING
2690 "EXT4-fs: Quota file not on filesystem root. "
2691 "Journalled quota will not work.\n");
2692 path_release(&nd);
2693 return vfs_quota_on(sb, type, format_id, path);
2694 }
2695
2696 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2697 * acquiring the locks... As quota files are never truncated and quota code
2698 * itself serializes the operations (and noone else should touch the files)
2699 * we don't have to be afraid of races */
2700 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
2701 size_t len, loff_t off)
2702 {
2703 struct inode *inode = sb_dqopt(sb)->files[type];
2704 sector_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
2705 int err = 0;
2706 int offset = off & (sb->s_blocksize - 1);
2707 int tocopy;
2708 size_t toread;
2709 struct buffer_head *bh;
2710 loff_t i_size = i_size_read(inode);
2711
2712 if (off > i_size)
2713 return 0;
2714 if (off+len > i_size)
2715 len = i_size-off;
2716 toread = len;
2717 while (toread > 0) {
2718 tocopy = sb->s_blocksize - offset < toread ?
2719 sb->s_blocksize - offset : toread;
2720 bh = ext4_bread(NULL, inode, blk, 0, &err);
2721 if (err)
2722 return err;
2723 if (!bh) /* A hole? */
2724 memset(data, 0, tocopy);
2725 else
2726 memcpy(data, bh->b_data+offset, tocopy);
2727 brelse(bh);
2728 offset = 0;
2729 toread -= tocopy;
2730 data += tocopy;
2731 blk++;
2732 }
2733 return len;
2734 }
2735
2736 /* Write to quotafile (we know the transaction is already started and has
2737 * enough credits) */
2738 static ssize_t ext4_quota_write(struct super_block *sb, int type,
2739 const char *data, size_t len, loff_t off)
2740 {
2741 struct inode *inode = sb_dqopt(sb)->files[type];
2742 sector_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
2743 int err = 0;
2744 int offset = off & (sb->s_blocksize - 1);
2745 int tocopy;
2746 int journal_quota = EXT4_SB(sb)->s_qf_names[type] != NULL;
2747 size_t towrite = len;
2748 struct buffer_head *bh;
2749 handle_t *handle = journal_current_handle();
2750
2751 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
2752 while (towrite > 0) {
2753 tocopy = sb->s_blocksize - offset < towrite ?
2754 sb->s_blocksize - offset : towrite;
2755 bh = ext4_bread(handle, inode, blk, 1, &err);
2756 if (!bh)
2757 goto out;
2758 if (journal_quota) {
2759 err = ext4_journal_get_write_access(handle, bh);
2760 if (err) {
2761 brelse(bh);
2762 goto out;
2763 }
2764 }
2765 lock_buffer(bh);
2766 memcpy(bh->b_data+offset, data, tocopy);
2767 flush_dcache_page(bh->b_page);
2768 unlock_buffer(bh);
2769 if (journal_quota)
2770 err = ext4_journal_dirty_metadata(handle, bh);
2771 else {
2772 /* Always do at least ordered writes for quotas */
2773 err = ext4_journal_dirty_data(handle, bh);
2774 mark_buffer_dirty(bh);
2775 }
2776 brelse(bh);
2777 if (err)
2778 goto out;
2779 offset = 0;
2780 towrite -= tocopy;
2781 data += tocopy;
2782 blk++;
2783 }
2784 out:
2785 if (len == towrite)
2786 return err;
2787 if (inode->i_size < off+len-towrite) {
2788 i_size_write(inode, off+len-towrite);
2789 EXT4_I(inode)->i_disksize = inode->i_size;
2790 }
2791 inode->i_version++;
2792 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2793 ext4_mark_inode_dirty(handle, inode);
2794 mutex_unlock(&inode->i_mutex);
2795 return len - towrite;
2796 }
2797
2798 #endif
2799
2800 static int ext4_get_sb(struct file_system_type *fs_type,
2801 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
2802 {
2803 return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super, mnt);
2804 }
2805
2806 static struct file_system_type ext4dev_fs_type = {
2807 .owner = THIS_MODULE,
2808 .name = "ext4dev",
2809 .get_sb = ext4_get_sb,
2810 .kill_sb = kill_block_super,
2811 .fs_flags = FS_REQUIRES_DEV,
2812 };
2813
2814 static int __init init_ext4_fs(void)
2815 {
2816 int err = init_ext4_xattr();
2817 if (err)
2818 return err;
2819 err = init_inodecache();
2820 if (err)
2821 goto out1;
2822 err = register_filesystem(&ext4dev_fs_type);
2823 if (err)
2824 goto out;
2825 return 0;
2826 out:
2827 destroy_inodecache();
2828 out1:
2829 exit_ext4_xattr();
2830 return err;
2831 }
2832
2833 static void __exit exit_ext4_fs(void)
2834 {
2835 unregister_filesystem(&ext4dev_fs_type);
2836 destroy_inodecache();
2837 exit_ext4_xattr();
2838 }
2839
2840 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
2841 MODULE_DESCRIPTION("Fourth Extended Filesystem with extents");
2842 MODULE_LICENSE("GPL");
2843 module_init(init_ext4_fs)
2844 module_exit(exit_ext4_fs)
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