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scripts: kernel-doc whitespace cleanup
[pv_ops_mirror.git] / fs / ext4 / super.c
blob71912693235487e40901625d7c0f3def0a729e15
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);
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);
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_CONSTRUCTOR) {
521 INIT_LIST_HEAD(&ei->i_orphan);
522 #ifdef CONFIG_EXT4DEV_FS_XATTR
523 init_rwsem(&ei->xattr_sem);
524 #endif
525 mutex_init(&ei->truncate_mutex);
526 inode_init_once(&ei->vfs_inode);
527 }
528 }
529
530 static int init_inodecache(void)
531 {
532 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
533 sizeof(struct ext4_inode_info),
534 0, (SLAB_RECLAIM_ACCOUNT|
535 SLAB_MEM_SPREAD),
536 init_once, NULL);
537 if (ext4_inode_cachep == NULL)
538 return -ENOMEM;
539 return 0;
540 }
541
542 static void destroy_inodecache(void)
543 {
544 kmem_cache_destroy(ext4_inode_cachep);
545 }
546
547 static void ext4_clear_inode(struct inode *inode)
548 {
549 struct ext4_block_alloc_info *rsv = EXT4_I(inode)->i_block_alloc_info;
550 #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
551 if (EXT4_I(inode)->i_acl &&
552 EXT4_I(inode)->i_acl != EXT4_ACL_NOT_CACHED) {
553 posix_acl_release(EXT4_I(inode)->i_acl);
554 EXT4_I(inode)->i_acl = EXT4_ACL_NOT_CACHED;
555 }
556 if (EXT4_I(inode)->i_default_acl &&
557 EXT4_I(inode)->i_default_acl != EXT4_ACL_NOT_CACHED) {
558 posix_acl_release(EXT4_I(inode)->i_default_acl);
559 EXT4_I(inode)->i_default_acl = EXT4_ACL_NOT_CACHED;
560 }
561 #endif
562 ext4_discard_reservation(inode);
563 EXT4_I(inode)->i_block_alloc_info = NULL;
564 if (unlikely(rsv))
565 kfree(rsv);
566 }
567
568 static inline void ext4_show_quota_options(struct seq_file *seq, struct super_block *sb)
569 {
570 #if defined(CONFIG_QUOTA)
571 struct ext4_sb_info *sbi = EXT4_SB(sb);
572
573 if (sbi->s_jquota_fmt)
574 seq_printf(seq, ",jqfmt=%s",
575 (sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold": "vfsv0");
576
577 if (sbi->s_qf_names[USRQUOTA])
578 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
579
580 if (sbi->s_qf_names[GRPQUOTA])
581 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
582
583 if (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA)
584 seq_puts(seq, ",usrquota");
585
586 if (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)
587 seq_puts(seq, ",grpquota");
588 #endif
589 }
590
591 static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs)
592 {
593 struct super_block *sb = vfs->mnt_sb;
594
595 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
596 seq_puts(seq, ",data=journal");
597 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
598 seq_puts(seq, ",data=ordered");
599 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
600 seq_puts(seq, ",data=writeback");
601
602 ext4_show_quota_options(seq, sb);
603
604 return 0;
605 }
606
607
608 static struct dentry *ext4_get_dentry(struct super_block *sb, void *vobjp)
609 {
610 __u32 *objp = vobjp;
611 unsigned long ino = objp[0];
612 __u32 generation = objp[1];
613 struct inode *inode;
614 struct dentry *result;
615
616 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
617 return ERR_PTR(-ESTALE);
618 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
619 return ERR_PTR(-ESTALE);
620
621 /* iget isn't really right if the inode is currently unallocated!!
622 *
623 * ext4_read_inode will return a bad_inode if the inode had been
624 * deleted, so we should be safe.
625 *
626 * Currently we don't know the generation for parent directory, so
627 * a generation of 0 means "accept any"
628 */
629 inode = iget(sb, ino);
630 if (inode == NULL)
631 return ERR_PTR(-ENOMEM);
632 if (is_bad_inode(inode) ||
633 (generation && inode->i_generation != generation)) {
634 iput(inode);
635 return ERR_PTR(-ESTALE);
636 }
637 /* now to find a dentry.
638 * If possible, get a well-connected one
639 */
640 result = d_alloc_anon(inode);
641 if (!result) {
642 iput(inode);
643 return ERR_PTR(-ENOMEM);
644 }
645 return result;
646 }
647
648 #ifdef CONFIG_QUOTA
649 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
650 #define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
651
652 static int ext4_dquot_initialize(struct inode *inode, int type);
653 static int ext4_dquot_drop(struct inode *inode);
654 static int ext4_write_dquot(struct dquot *dquot);
655 static int ext4_acquire_dquot(struct dquot *dquot);
656 static int ext4_release_dquot(struct dquot *dquot);
657 static int ext4_mark_dquot_dirty(struct dquot *dquot);
658 static int ext4_write_info(struct super_block *sb, int type);
659 static int ext4_quota_on(struct super_block *sb, int type, int format_id, char *path);
660 static int ext4_quota_on_mount(struct super_block *sb, int type);
661 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
662 size_t len, loff_t off);
663 static ssize_t ext4_quota_write(struct super_block *sb, int type,
664 const char *data, size_t len, loff_t off);
665
666 static struct dquot_operations ext4_quota_operations = {
667 .initialize = ext4_dquot_initialize,
668 .drop = ext4_dquot_drop,
669 .alloc_space = dquot_alloc_space,
670 .alloc_inode = dquot_alloc_inode,
671 .free_space = dquot_free_space,
672 .free_inode = dquot_free_inode,
673 .transfer = dquot_transfer,
674 .write_dquot = ext4_write_dquot,
675 .acquire_dquot = ext4_acquire_dquot,
676 .release_dquot = ext4_release_dquot,
677 .mark_dirty = ext4_mark_dquot_dirty,
678 .write_info = ext4_write_info
679 };
680
681 static struct quotactl_ops ext4_qctl_operations = {
682 .quota_on = ext4_quota_on,
683 .quota_off = vfs_quota_off,
684 .quota_sync = vfs_quota_sync,
685 .get_info = vfs_get_dqinfo,
686 .set_info = vfs_set_dqinfo,
687 .get_dqblk = vfs_get_dqblk,
688 .set_dqblk = vfs_set_dqblk
689 };
690 #endif
691
692 static const struct super_operations ext4_sops = {
693 .alloc_inode = ext4_alloc_inode,
694 .destroy_inode = ext4_destroy_inode,
695 .read_inode = ext4_read_inode,
696 .write_inode = ext4_write_inode,
697 .dirty_inode = ext4_dirty_inode,
698 .delete_inode = ext4_delete_inode,
699 .put_super = ext4_put_super,
700 .write_super = ext4_write_super,
701 .sync_fs = ext4_sync_fs,
702 .write_super_lockfs = ext4_write_super_lockfs,
703 .unlockfs = ext4_unlockfs,
704 .statfs = ext4_statfs,
705 .remount_fs = ext4_remount,
706 .clear_inode = ext4_clear_inode,
707 .show_options = ext4_show_options,
708 #ifdef CONFIG_QUOTA
709 .quota_read = ext4_quota_read,
710 .quota_write = ext4_quota_write,
711 #endif
712 };
713
714 static struct export_operations ext4_export_ops = {
715 .get_parent = ext4_get_parent,
716 .get_dentry = ext4_get_dentry,
717 };
718
719 enum {
720 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
721 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
722 Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
723 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
724 Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh,
725 Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
726 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
727 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
728 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota,
729 Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota,
730 Opt_grpquota, Opt_extents,
731 };
732
733 static match_table_t tokens = {
734 {Opt_bsd_df, "bsddf"},
735 {Opt_minix_df, "minixdf"},
736 {Opt_grpid, "grpid"},
737 {Opt_grpid, "bsdgroups"},
738 {Opt_nogrpid, "nogrpid"},
739 {Opt_nogrpid, "sysvgroups"},
740 {Opt_resgid, "resgid=%u"},
741 {Opt_resuid, "resuid=%u"},
742 {Opt_sb, "sb=%u"},
743 {Opt_err_cont, "errors=continue"},
744 {Opt_err_panic, "errors=panic"},
745 {Opt_err_ro, "errors=remount-ro"},
746 {Opt_nouid32, "nouid32"},
747 {Opt_nocheck, "nocheck"},
748 {Opt_nocheck, "check=none"},
749 {Opt_debug, "debug"},
750 {Opt_oldalloc, "oldalloc"},
751 {Opt_orlov, "orlov"},
752 {Opt_user_xattr, "user_xattr"},
753 {Opt_nouser_xattr, "nouser_xattr"},
754 {Opt_acl, "acl"},
755 {Opt_noacl, "noacl"},
756 {Opt_reservation, "reservation"},
757 {Opt_noreservation, "noreservation"},
758 {Opt_noload, "noload"},
759 {Opt_nobh, "nobh"},
760 {Opt_bh, "bh"},
761 {Opt_commit, "commit=%u"},
762 {Opt_journal_update, "journal=update"},
763 {Opt_journal_inum, "journal=%u"},
764 {Opt_journal_dev, "journal_dev=%u"},
765 {Opt_abort, "abort"},
766 {Opt_data_journal, "data=journal"},
767 {Opt_data_ordered, "data=ordered"},
768 {Opt_data_writeback, "data=writeback"},
769 {Opt_offusrjquota, "usrjquota="},
770 {Opt_usrjquota, "usrjquota=%s"},
771 {Opt_offgrpjquota, "grpjquota="},
772 {Opt_grpjquota, "grpjquota=%s"},
773 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
774 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
775 {Opt_grpquota, "grpquota"},
776 {Opt_noquota, "noquota"},
777 {Opt_quota, "quota"},
778 {Opt_usrquota, "usrquota"},
779 {Opt_barrier, "barrier=%u"},
780 {Opt_extents, "extents"},
781 {Opt_err, NULL},
782 {Opt_resize, "resize"},
783 };
784
785 static ext4_fsblk_t get_sb_block(void **data)
786 {
787 ext4_fsblk_t sb_block;
788 char *options = (char *) *data;
789
790 if (!options || strncmp(options, "sb=", 3) != 0)
791 return 1; /* Default location */
792 options += 3;
793 /*todo: use simple_strtoll with >32bit ext4 */
794 sb_block = simple_strtoul(options, &options, 0);
795 if (*options && *options != ',') {
796 printk("EXT4-fs: Invalid sb specification: %s\n",
797 (char *) *data);
798 return 1;
799 }
800 if (*options == ',')
801 options++;
802 *data = (void *) options;
803 return sb_block;
804 }
805
806 static int parse_options (char *options, struct super_block *sb,
807 unsigned int *inum, unsigned long *journal_devnum,
808 ext4_fsblk_t *n_blocks_count, int is_remount)
809 {
810 struct ext4_sb_info *sbi = EXT4_SB(sb);
811 char * p;
812 substring_t args[MAX_OPT_ARGS];
813 int data_opt = 0;
814 int option;
815 #ifdef CONFIG_QUOTA
816 int qtype;
817 char *qname;
818 #endif
819
820 if (!options)
821 return 1;
822
823 while ((p = strsep (&options, ",")) != NULL) {
824 int token;
825 if (!*p)
826 continue;
827
828 token = match_token(p, tokens, args);
829 switch (token) {
830 case Opt_bsd_df:
831 clear_opt (sbi->s_mount_opt, MINIX_DF);
832 break;
833 case Opt_minix_df:
834 set_opt (sbi->s_mount_opt, MINIX_DF);
835 break;
836 case Opt_grpid:
837 set_opt (sbi->s_mount_opt, GRPID);
838 break;
839 case Opt_nogrpid:
840 clear_opt (sbi->s_mount_opt, GRPID);
841 break;
842 case Opt_resuid:
843 if (match_int(&args[0], &option))
844 return 0;
845 sbi->s_resuid = option;
846 break;
847 case Opt_resgid:
848 if (match_int(&args[0], &option))
849 return 0;
850 sbi->s_resgid = option;
851 break;
852 case Opt_sb:
853 /* handled by get_sb_block() instead of here */
854 /* *sb_block = match_int(&args[0]); */
855 break;
856 case Opt_err_panic:
857 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
858 clear_opt (sbi->s_mount_opt, ERRORS_RO);
859 set_opt (sbi->s_mount_opt, ERRORS_PANIC);
860 break;
861 case Opt_err_ro:
862 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
863 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
864 set_opt (sbi->s_mount_opt, ERRORS_RO);
865 break;
866 case Opt_err_cont:
867 clear_opt (sbi->s_mount_opt, ERRORS_RO);
868 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
869 set_opt (sbi->s_mount_opt, ERRORS_CONT);
870 break;
871 case Opt_nouid32:
872 set_opt (sbi->s_mount_opt, NO_UID32);
873 break;
874 case Opt_nocheck:
875 clear_opt (sbi->s_mount_opt, CHECK);
876 break;
877 case Opt_debug:
878 set_opt (sbi->s_mount_opt, DEBUG);
879 break;
880 case Opt_oldalloc:
881 set_opt (sbi->s_mount_opt, OLDALLOC);
882 break;
883 case Opt_orlov:
884 clear_opt (sbi->s_mount_opt, OLDALLOC);
885 break;
886 #ifdef CONFIG_EXT4DEV_FS_XATTR
887 case Opt_user_xattr:
888 set_opt (sbi->s_mount_opt, XATTR_USER);
889 break;
890 case Opt_nouser_xattr:
891 clear_opt (sbi->s_mount_opt, XATTR_USER);
892 break;
893 #else
894 case Opt_user_xattr:
895 case Opt_nouser_xattr:
896 printk("EXT4 (no)user_xattr options not supported\n");
897 break;
898 #endif
899 #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
900 case Opt_acl:
901 set_opt(sbi->s_mount_opt, POSIX_ACL);
902 break;
903 case Opt_noacl:
904 clear_opt(sbi->s_mount_opt, POSIX_ACL);
905 break;
906 #else
907 case Opt_acl:
908 case Opt_noacl:
909 printk("EXT4 (no)acl options not supported\n");
910 break;
911 #endif
912 case Opt_reservation:
913 set_opt(sbi->s_mount_opt, RESERVATION);
914 break;
915 case Opt_noreservation:
916 clear_opt(sbi->s_mount_opt, RESERVATION);
917 break;
918 case Opt_journal_update:
919 /* @@@ FIXME */
920 /* Eventually we will want to be able to create
921 a journal file here. For now, only allow the
922 user to specify an existing inode to be the
923 journal file. */
924 if (is_remount) {
925 printk(KERN_ERR "EXT4-fs: cannot specify "
926 "journal on remount\n");
927 return 0;
928 }
929 set_opt (sbi->s_mount_opt, UPDATE_JOURNAL);
930 break;
931 case Opt_journal_inum:
932 if (is_remount) {
933 printk(KERN_ERR "EXT4-fs: cannot specify "
934 "journal on remount\n");
935 return 0;
936 }
937 if (match_int(&args[0], &option))
938 return 0;
939 *inum = option;
940 break;
941 case Opt_journal_dev:
942 if (is_remount) {
943 printk(KERN_ERR "EXT4-fs: cannot specify "
944 "journal on remount\n");
945 return 0;
946 }
947 if (match_int(&args[0], &option))
948 return 0;
949 *journal_devnum = option;
950 break;
951 case Opt_noload:
952 set_opt (sbi->s_mount_opt, NOLOAD);
953 break;
954 case Opt_commit:
955 if (match_int(&args[0], &option))
956 return 0;
957 if (option < 0)
958 return 0;
959 if (option == 0)
960 option = JBD_DEFAULT_MAX_COMMIT_AGE;
961 sbi->s_commit_interval = HZ * option;
962 break;
963 case Opt_data_journal:
964 data_opt = EXT4_MOUNT_JOURNAL_DATA;
965 goto datacheck;
966 case Opt_data_ordered:
967 data_opt = EXT4_MOUNT_ORDERED_DATA;
968 goto datacheck;
969 case Opt_data_writeback:
970 data_opt = EXT4_MOUNT_WRITEBACK_DATA;
971 datacheck:
972 if (is_remount) {
973 if ((sbi->s_mount_opt & EXT4_MOUNT_DATA_FLAGS)
974 != data_opt) {
975 printk(KERN_ERR
976 "EXT4-fs: cannot change data "
977 "mode on remount\n");
978 return 0;
979 }
980 } else {
981 sbi->s_mount_opt &= ~EXT4_MOUNT_DATA_FLAGS;
982 sbi->s_mount_opt |= data_opt;
983 }
984 break;
985 #ifdef CONFIG_QUOTA
986 case Opt_usrjquota:
987 qtype = USRQUOTA;
988 goto set_qf_name;
989 case Opt_grpjquota:
990 qtype = GRPQUOTA;
991 set_qf_name:
992 if (sb_any_quota_enabled(sb)) {
993 printk(KERN_ERR
994 "EXT4-fs: Cannot change journalled "
995 "quota options when quota turned on.\n");
996 return 0;
997 }
998 qname = match_strdup(&args[0]);
999 if (!qname) {
1000 printk(KERN_ERR
1001 "EXT4-fs: not enough memory for "
1002 "storing quotafile name.\n");
1003 return 0;
1004 }
1005 if (sbi->s_qf_names[qtype] &&
1006 strcmp(sbi->s_qf_names[qtype], qname)) {
1007 printk(KERN_ERR
1008 "EXT4-fs: %s quota file already "
1009 "specified.\n", QTYPE2NAME(qtype));
1010 kfree(qname);
1011 return 0;
1012 }
1013 sbi->s_qf_names[qtype] = qname;
1014 if (strchr(sbi->s_qf_names[qtype], '/')) {
1015 printk(KERN_ERR
1016 "EXT4-fs: quotafile must be on "
1017 "filesystem root.\n");
1018 kfree(sbi->s_qf_names[qtype]);
1019 sbi->s_qf_names[qtype] = NULL;
1020 return 0;
1021 }
1022 set_opt(sbi->s_mount_opt, QUOTA);
1023 break;
1024 case Opt_offusrjquota:
1025 qtype = USRQUOTA;
1026 goto clear_qf_name;
1027 case Opt_offgrpjquota:
1028 qtype = GRPQUOTA;
1029 clear_qf_name:
1030 if (sb_any_quota_enabled(sb)) {
1031 printk(KERN_ERR "EXT4-fs: Cannot change "
1032 "journalled quota options when "
1033 "quota turned on.\n");
1034 return 0;
1035 }
1036 /*
1037 * The space will be released later when all options
1038 * are confirmed to be correct
1039 */
1040 sbi->s_qf_names[qtype] = NULL;
1041 break;
1042 case Opt_jqfmt_vfsold:
1043 sbi->s_jquota_fmt = QFMT_VFS_OLD;
1044 break;
1045 case Opt_jqfmt_vfsv0:
1046 sbi->s_jquota_fmt = QFMT_VFS_V0;
1047 break;
1048 case Opt_quota:
1049 case Opt_usrquota:
1050 set_opt(sbi->s_mount_opt, QUOTA);
1051 set_opt(sbi->s_mount_opt, USRQUOTA);
1052 break;
1053 case Opt_grpquota:
1054 set_opt(sbi->s_mount_opt, QUOTA);
1055 set_opt(sbi->s_mount_opt, GRPQUOTA);
1056 break;
1057 case Opt_noquota:
1058 if (sb_any_quota_enabled(sb)) {
1059 printk(KERN_ERR "EXT4-fs: Cannot change quota "
1060 "options when quota turned on.\n");
1061 return 0;
1062 }
1063 clear_opt(sbi->s_mount_opt, QUOTA);
1064 clear_opt(sbi->s_mount_opt, USRQUOTA);
1065 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1066 break;
1067 #else
1068 case Opt_quota:
1069 case Opt_usrquota:
1070 case Opt_grpquota:
1071 case Opt_usrjquota:
1072 case Opt_grpjquota:
1073 case Opt_offusrjquota:
1074 case Opt_offgrpjquota:
1075 case Opt_jqfmt_vfsold:
1076 case Opt_jqfmt_vfsv0:
1077 printk(KERN_ERR
1078 "EXT4-fs: journalled quota options not "
1079 "supported.\n");
1080 break;
1081 case Opt_noquota:
1082 break;
1083 #endif
1084 case Opt_abort:
1085 set_opt(sbi->s_mount_opt, ABORT);
1086 break;
1087 case Opt_barrier:
1088 if (match_int(&args[0], &option))
1089 return 0;
1090 if (option)
1091 set_opt(sbi->s_mount_opt, BARRIER);
1092 else
1093 clear_opt(sbi->s_mount_opt, BARRIER);
1094 break;
1095 case Opt_ignore:
1096 break;
1097 case Opt_resize:
1098 if (!is_remount) {
1099 printk("EXT4-fs: resize option only available "
1100 "for remount\n");
1101 return 0;
1102 }
1103 if (match_int(&args[0], &option) != 0)
1104 return 0;
1105 *n_blocks_count = option;
1106 break;
1107 case Opt_nobh:
1108 set_opt(sbi->s_mount_opt, NOBH);
1109 break;
1110 case Opt_bh:
1111 clear_opt(sbi->s_mount_opt, NOBH);
1112 break;
1113 case Opt_extents:
1114 set_opt (sbi->s_mount_opt, EXTENTS);
1115 break;
1116 default:
1117 printk (KERN_ERR
1118 "EXT4-fs: Unrecognized mount option \"%s\" "
1119 "or missing value\n", p);
1120 return 0;
1121 }
1122 }
1123 #ifdef CONFIG_QUOTA
1124 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1125 if ((sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA) &&
1126 sbi->s_qf_names[USRQUOTA])
1127 clear_opt(sbi->s_mount_opt, USRQUOTA);
1128
1129 if ((sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA) &&
1130 sbi->s_qf_names[GRPQUOTA])
1131 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1132
1133 if ((sbi->s_qf_names[USRQUOTA] &&
1134 (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)) ||
1135 (sbi->s_qf_names[GRPQUOTA] &&
1136 (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA))) {
1137 printk(KERN_ERR "EXT4-fs: old and new quota "
1138 "format mixing.\n");
1139 return 0;
1140 }
1141
1142 if (!sbi->s_jquota_fmt) {
1143 printk(KERN_ERR "EXT4-fs: journalled quota format "
1144 "not specified.\n");
1145 return 0;
1146 }
1147 } else {
1148 if (sbi->s_jquota_fmt) {
1149 printk(KERN_ERR "EXT4-fs: journalled quota format "
1150 "specified with no journalling "
1151 "enabled.\n");
1152 return 0;
1153 }
1154 }
1155 #endif
1156 return 1;
1157 }
1158
1159 static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
1160 int read_only)
1161 {
1162 struct ext4_sb_info *sbi = EXT4_SB(sb);
1163 int res = 0;
1164
1165 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
1166 printk (KERN_ERR "EXT4-fs warning: revision level too high, "
1167 "forcing read-only mode\n");
1168 res = MS_RDONLY;
1169 }
1170 if (read_only)
1171 return res;
1172 if (!(sbi->s_mount_state & EXT4_VALID_FS))
1173 printk (KERN_WARNING "EXT4-fs warning: mounting unchecked fs, "
1174 "running e2fsck is recommended\n");
1175 else if ((sbi->s_mount_state & EXT4_ERROR_FS))
1176 printk (KERN_WARNING
1177 "EXT4-fs warning: mounting fs with errors, "
1178 "running e2fsck is recommended\n");
1179 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
1180 le16_to_cpu(es->s_mnt_count) >=
1181 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
1182 printk (KERN_WARNING
1183 "EXT4-fs warning: maximal mount count reached, "
1184 "running e2fsck is recommended\n");
1185 else if (le32_to_cpu(es->s_checkinterval) &&
1186 (le32_to_cpu(es->s_lastcheck) +
1187 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1188 printk (KERN_WARNING
1189 "EXT4-fs warning: checktime reached, "
1190 "running e2fsck is recommended\n");
1191 #if 0
1192 /* @@@ We _will_ want to clear the valid bit if we find
1193 * inconsistencies, to force a fsck at reboot. But for
1194 * a plain journaled filesystem we can keep it set as
1195 * valid forever! :)
1196 */
1197 es->s_state = cpu_to_le16(le16_to_cpu(es->s_state) & ~EXT4_VALID_FS);
1198 #endif
1199 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
1200 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
1201 es->s_mnt_count=cpu_to_le16(le16_to_cpu(es->s_mnt_count) + 1);
1202 es->s_mtime = cpu_to_le32(get_seconds());
1203 ext4_update_dynamic_rev(sb);
1204 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
1205
1206 ext4_commit_super(sb, es, 1);
1207 if (test_opt(sb, DEBUG))
1208 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%lu, "
1209 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
1210 sb->s_blocksize,
1211 sbi->s_groups_count,
1212 EXT4_BLOCKS_PER_GROUP(sb),
1213 EXT4_INODES_PER_GROUP(sb),
1214 sbi->s_mount_opt);
1215
1216 printk(KERN_INFO "EXT4 FS on %s, ", sb->s_id);
1217 if (EXT4_SB(sb)->s_journal->j_inode == NULL) {
1218 char b[BDEVNAME_SIZE];
1219
1220 printk("external journal on %s\n",
1221 bdevname(EXT4_SB(sb)->s_journal->j_dev, b));
1222 } else {
1223 printk("internal journal\n");
1224 }
1225 return res;
1226 }
1227
1228 /* Called at mount-time, super-block is locked */
1229 static int ext4_check_descriptors (struct super_block * sb)
1230 {
1231 struct ext4_sb_info *sbi = EXT4_SB(sb);
1232 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
1233 ext4_fsblk_t last_block;
1234 ext4_fsblk_t block_bitmap;
1235 ext4_fsblk_t inode_bitmap;
1236 ext4_fsblk_t inode_table;
1237 struct ext4_group_desc * gdp = NULL;
1238 int desc_block = 0;
1239 int i;
1240
1241 ext4_debug ("Checking group descriptors");
1242
1243 for (i = 0; i < sbi->s_groups_count; i++)
1244 {
1245 if (i == sbi->s_groups_count - 1)
1246 last_block = ext4_blocks_count(sbi->s_es) - 1;
1247 else
1248 last_block = first_block +
1249 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
1250
1251 if ((i % EXT4_DESC_PER_BLOCK(sb)) == 0)
1252 gdp = (struct ext4_group_desc *)
1253 sbi->s_group_desc[desc_block++]->b_data;
1254 block_bitmap = ext4_block_bitmap(sb, gdp);
1255 if (block_bitmap < first_block || block_bitmap > last_block)
1256 {
1257 ext4_error (sb, "ext4_check_descriptors",
1258 "Block bitmap for group %d"
1259 " not in group (block %llu)!",
1260 i, block_bitmap);
1261 return 0;
1262 }
1263 inode_bitmap = ext4_inode_bitmap(sb, gdp);
1264 if (inode_bitmap < first_block || inode_bitmap > last_block)
1265 {
1266 ext4_error (sb, "ext4_check_descriptors",
1267 "Inode bitmap for group %d"
1268 " not in group (block %llu)!",
1269 i, inode_bitmap);
1270 return 0;
1271 }
1272 inode_table = ext4_inode_table(sb, gdp);
1273 if (inode_table < first_block ||
1274 inode_table + sbi->s_itb_per_group > last_block)
1275 {
1276 ext4_error (sb, "ext4_check_descriptors",
1277 "Inode table for group %d"
1278 " not in group (block %llu)!",
1279 i, inode_table);
1280 return 0;
1281 }
1282 first_block += EXT4_BLOCKS_PER_GROUP(sb);
1283 gdp = (struct ext4_group_desc *)
1284 ((__u8 *)gdp + EXT4_DESC_SIZE(sb));
1285 }
1286
1287 ext4_free_blocks_count_set(sbi->s_es, ext4_count_free_blocks(sb));
1288 sbi->s_es->s_free_inodes_count=cpu_to_le32(ext4_count_free_inodes(sb));
1289 return 1;
1290 }
1291
1292
1293 /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
1294 * the superblock) which were deleted from all directories, but held open by
1295 * a process at the time of a crash. We walk the list and try to delete these
1296 * inodes at recovery time (only with a read-write filesystem).
1297 *
1298 * In order to keep the orphan inode chain consistent during traversal (in
1299 * case of crash during recovery), we link each inode into the superblock
1300 * orphan list_head and handle it the same way as an inode deletion during
1301 * normal operation (which journals the operations for us).
1302 *
1303 * We only do an iget() and an iput() on each inode, which is very safe if we
1304 * accidentally point at an in-use or already deleted inode. The worst that
1305 * can happen in this case is that we get a "bit already cleared" message from
1306 * ext4_free_inode(). The only reason we would point at a wrong inode is if
1307 * e2fsck was run on this filesystem, and it must have already done the orphan
1308 * inode cleanup for us, so we can safely abort without any further action.
1309 */
1310 static void ext4_orphan_cleanup (struct super_block * sb,
1311 struct ext4_super_block * es)
1312 {
1313 unsigned int s_flags = sb->s_flags;
1314 int nr_orphans = 0, nr_truncates = 0;
1315 #ifdef CONFIG_QUOTA
1316 int i;
1317 #endif
1318 if (!es->s_last_orphan) {
1319 jbd_debug(4, "no orphan inodes to clean up\n");
1320 return;
1321 }
1322
1323 if (bdev_read_only(sb->s_bdev)) {
1324 printk(KERN_ERR "EXT4-fs: write access "
1325 "unavailable, skipping orphan cleanup.\n");
1326 return;
1327 }
1328
1329 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
1330 if (es->s_last_orphan)
1331 jbd_debug(1, "Errors on filesystem, "
1332 "clearing orphan list.\n");
1333 es->s_last_orphan = 0;
1334 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1335 return;
1336 }
1337
1338 if (s_flags & MS_RDONLY) {
1339 printk(KERN_INFO "EXT4-fs: %s: orphan cleanup on readonly fs\n",
1340 sb->s_id);
1341 sb->s_flags &= ~MS_RDONLY;
1342 }
1343 #ifdef CONFIG_QUOTA
1344 /* Needed for iput() to work correctly and not trash data */
1345 sb->s_flags |= MS_ACTIVE;
1346 /* Turn on quotas so that they are updated correctly */
1347 for (i = 0; i < MAXQUOTAS; i++) {
1348 if (EXT4_SB(sb)->s_qf_names[i]) {
1349 int ret = ext4_quota_on_mount(sb, i);
1350 if (ret < 0)
1351 printk(KERN_ERR
1352 "EXT4-fs: Cannot turn on journalled "
1353 "quota: error %d\n", ret);
1354 }
1355 }
1356 #endif
1357
1358 while (es->s_last_orphan) {
1359 struct inode *inode;
1360
1361 if (!(inode =
1362 ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan)))) {
1363 es->s_last_orphan = 0;
1364 break;
1365 }
1366
1367 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
1368 DQUOT_INIT(inode);
1369 if (inode->i_nlink) {
1370 printk(KERN_DEBUG
1371 "%s: truncating inode %lu to %Ld bytes\n",
1372 __FUNCTION__, inode->i_ino, inode->i_size);
1373 jbd_debug(2, "truncating inode %lu to %Ld bytes\n",
1374 inode->i_ino, inode->i_size);
1375 ext4_truncate(inode);
1376 nr_truncates++;
1377 } else {
1378 printk(KERN_DEBUG
1379 "%s: deleting unreferenced inode %lu\n",
1380 __FUNCTION__, inode->i_ino);
1381 jbd_debug(2, "deleting unreferenced inode %lu\n",
1382 inode->i_ino);
1383 nr_orphans++;
1384 }
1385 iput(inode); /* The delete magic happens here! */
1386 }
1387
1388 #define PLURAL(x) (x), ((x)==1) ? "" : "s"
1389
1390 if (nr_orphans)
1391 printk(KERN_INFO "EXT4-fs: %s: %d orphan inode%s deleted\n",
1392 sb->s_id, PLURAL(nr_orphans));
1393 if (nr_truncates)
1394 printk(KERN_INFO "EXT4-fs: %s: %d truncate%s cleaned up\n",
1395 sb->s_id, PLURAL(nr_truncates));
1396 #ifdef CONFIG_QUOTA
1397 /* Turn quotas off */
1398 for (i = 0; i < MAXQUOTAS; i++) {
1399 if (sb_dqopt(sb)->files[i])
1400 vfs_quota_off(sb, i);
1401 }
1402 #endif
1403 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1404 }
1405
1406 #define log2(n) ffz(~(n))
1407
1408 /*
1409 * Maximal file size. There is a direct, and {,double-,triple-}indirect
1410 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
1411 * We need to be 1 filesystem block less than the 2^32 sector limit.
1412 */
1413 static loff_t ext4_max_size(int bits)
1414 {
1415 loff_t res = EXT4_NDIR_BLOCKS;
1416 /* This constant is calculated to be the largest file size for a
1417 * dense, 4k-blocksize file such that the total number of
1418 * sectors in the file, including data and all indirect blocks,
1419 * does not exceed 2^32. */
1420 const loff_t upper_limit = 0x1ff7fffd000LL;
1421
1422 res += 1LL << (bits-2);
1423 res += 1LL << (2*(bits-2));
1424 res += 1LL << (3*(bits-2));
1425 res <<= bits;
1426 if (res > upper_limit)
1427 res = upper_limit;
1428 return res;
1429 }
1430
1431 static ext4_fsblk_t descriptor_loc(struct super_block *sb,
1432 ext4_fsblk_t logical_sb_block, int nr)
1433 {
1434 struct ext4_sb_info *sbi = EXT4_SB(sb);
1435 unsigned long bg, first_meta_bg;
1436 int has_super = 0;
1437
1438 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1439
1440 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
1441 nr < first_meta_bg)
1442 return logical_sb_block + nr + 1;
1443 bg = sbi->s_desc_per_block * nr;
1444 if (ext4_bg_has_super(sb, bg))
1445 has_super = 1;
1446 return (has_super + ext4_group_first_block_no(sb, bg));
1447 }
1448
1449
1450 static int ext4_fill_super (struct super_block *sb, void *data, int silent)
1451 {
1452 struct buffer_head * bh;
1453 struct ext4_super_block *es = NULL;
1454 struct ext4_sb_info *sbi;
1455 ext4_fsblk_t block;
1456 ext4_fsblk_t sb_block = get_sb_block(&data);
1457 ext4_fsblk_t logical_sb_block;
1458 unsigned long offset = 0;
1459 unsigned int journal_inum = 0;
1460 unsigned long journal_devnum = 0;
1461 unsigned long def_mount_opts;
1462 struct inode *root;
1463 int blocksize;
1464 int hblock;
1465 int db_count;
1466 int i;
1467 int needs_recovery;
1468 __le32 features;
1469 __u64 blocks_count;
1470
1471 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
1472 if (!sbi)
1473 return -ENOMEM;
1474 sb->s_fs_info = sbi;
1475 sbi->s_mount_opt = 0;
1476 sbi->s_resuid = EXT4_DEF_RESUID;
1477 sbi->s_resgid = EXT4_DEF_RESGID;
1478
1479 unlock_kernel();
1480
1481 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
1482 if (!blocksize) {
1483 printk(KERN_ERR "EXT4-fs: unable to set blocksize\n");
1484 goto out_fail;
1485 }
1486
1487 /*
1488 * The ext4 superblock will not be buffer aligned for other than 1kB
1489 * block sizes. We need to calculate the offset from buffer start.
1490 */
1491 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
1492 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
1493 offset = do_div(logical_sb_block, blocksize);
1494 } else {
1495 logical_sb_block = sb_block;
1496 }
1497
1498 if (!(bh = sb_bread(sb, logical_sb_block))) {
1499 printk (KERN_ERR "EXT4-fs: unable to read superblock\n");
1500 goto out_fail;
1501 }
1502 /*
1503 * Note: s_es must be initialized as soon as possible because
1504 * some ext4 macro-instructions depend on its value
1505 */
1506 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
1507 sbi->s_es = es;
1508 sb->s_magic = le16_to_cpu(es->s_magic);
1509 if (sb->s_magic != EXT4_SUPER_MAGIC)
1510 goto cantfind_ext4;
1511
1512 /* Set defaults before we parse the mount options */
1513 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
1514 if (def_mount_opts & EXT4_DEFM_DEBUG)
1515 set_opt(sbi->s_mount_opt, DEBUG);
1516 if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
1517 set_opt(sbi->s_mount_opt, GRPID);
1518 if (def_mount_opts & EXT4_DEFM_UID16)
1519 set_opt(sbi->s_mount_opt, NO_UID32);
1520 #ifdef CONFIG_EXT4DEV_FS_XATTR
1521 if (def_mount_opts & EXT4_DEFM_XATTR_USER)
1522 set_opt(sbi->s_mount_opt, XATTR_USER);
1523 #endif
1524 #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
1525 if (def_mount_opts & EXT4_DEFM_ACL)
1526 set_opt(sbi->s_mount_opt, POSIX_ACL);
1527 #endif
1528 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
1529 sbi->s_mount_opt |= EXT4_MOUNT_JOURNAL_DATA;
1530 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
1531 sbi->s_mount_opt |= EXT4_MOUNT_ORDERED_DATA;
1532 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
1533 sbi->s_mount_opt |= EXT4_MOUNT_WRITEBACK_DATA;
1534
1535 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
1536 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1537 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_RO)
1538 set_opt(sbi->s_mount_opt, ERRORS_RO);
1539 else
1540 set_opt(sbi->s_mount_opt, ERRORS_CONT);
1541
1542 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
1543 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
1544
1545 set_opt(sbi->s_mount_opt, RESERVATION);
1546
1547 if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
1548 NULL, 0))
1549 goto failed_mount;
1550
1551 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1552 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
1553
1554 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
1555 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
1556 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
1557 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
1558 printk(KERN_WARNING
1559 "EXT4-fs warning: feature flags set on rev 0 fs, "
1560 "running e2fsck is recommended\n");
1561 /*
1562 * Check feature flags regardless of the revision level, since we
1563 * previously didn't change the revision level when setting the flags,
1564 * so there is a chance incompat flags are set on a rev 0 filesystem.
1565 */
1566 features = EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP);
1567 if (features) {
1568 printk(KERN_ERR "EXT4-fs: %s: couldn't mount because of "
1569 "unsupported optional features (%x).\n",
1570 sb->s_id, le32_to_cpu(features));
1571 goto failed_mount;
1572 }
1573 features = EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP);
1574 if (!(sb->s_flags & MS_RDONLY) && features) {
1575 printk(KERN_ERR "EXT4-fs: %s: couldn't mount RDWR because of "
1576 "unsupported optional features (%x).\n",
1577 sb->s_id, le32_to_cpu(features));
1578 goto failed_mount;
1579 }
1580 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
1581
1582 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
1583 blocksize > EXT4_MAX_BLOCK_SIZE) {
1584 printk(KERN_ERR
1585 "EXT4-fs: Unsupported filesystem blocksize %d on %s.\n",
1586 blocksize, sb->s_id);
1587 goto failed_mount;
1588 }
1589
1590 hblock = bdev_hardsect_size(sb->s_bdev);
1591 if (sb->s_blocksize != blocksize) {
1592 /*
1593 * Make sure the blocksize for the filesystem is larger
1594 * than the hardware sectorsize for the machine.
1595 */
1596 if (blocksize < hblock) {
1597 printk(KERN_ERR "EXT4-fs: blocksize %d too small for "
1598 "device blocksize %d.\n", blocksize, hblock);
1599 goto failed_mount;
1600 }
1601
1602 brelse (bh);
1603 sb_set_blocksize(sb, blocksize);
1604 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
1605 offset = do_div(logical_sb_block, blocksize);
1606 bh = sb_bread(sb, logical_sb_block);
1607 if (!bh) {
1608 printk(KERN_ERR
1609 "EXT4-fs: Can't read superblock on 2nd try.\n");
1610 goto failed_mount;
1611 }
1612 es = (struct ext4_super_block *)(((char *)bh->b_data) + offset);
1613 sbi->s_es = es;
1614 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
1615 printk (KERN_ERR
1616 "EXT4-fs: Magic mismatch, very weird !\n");
1617 goto failed_mount;
1618 }
1619 }
1620
1621 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits);
1622
1623 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
1624 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
1625 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
1626 } else {
1627 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
1628 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
1629 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
1630 (sbi->s_inode_size & (sbi->s_inode_size - 1)) ||
1631 (sbi->s_inode_size > blocksize)) {
1632 printk (KERN_ERR
1633 "EXT4-fs: unsupported inode size: %d\n",
1634 sbi->s_inode_size);
1635 goto failed_mount;
1636 }
1637 }
1638 sbi->s_frag_size = EXT4_MIN_FRAG_SIZE <<
1639 le32_to_cpu(es->s_log_frag_size);
1640 if (blocksize != sbi->s_frag_size) {
1641 printk(KERN_ERR
1642 "EXT4-fs: fragsize %lu != blocksize %u (unsupported)\n",
1643 sbi->s_frag_size, blocksize);
1644 goto failed_mount;
1645 }
1646 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
1647 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
1648 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
1649 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
1650 sbi->s_desc_size & (sbi->s_desc_size - 1)) {
1651 printk(KERN_ERR
1652 "EXT4-fs: unsupported descriptor size %lu\n",
1653 sbi->s_desc_size);
1654 goto failed_mount;
1655 }
1656 } else
1657 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
1658 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
1659 sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
1660 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
1661 if (EXT4_INODE_SIZE(sb) == 0)
1662 goto cantfind_ext4;
1663 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
1664 if (sbi->s_inodes_per_block == 0)
1665 goto cantfind_ext4;
1666 sbi->s_itb_per_group = sbi->s_inodes_per_group /
1667 sbi->s_inodes_per_block;
1668 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
1669 sbi->s_sbh = bh;
1670 sbi->s_mount_state = le16_to_cpu(es->s_state);
1671 sbi->s_addr_per_block_bits = log2(EXT4_ADDR_PER_BLOCK(sb));
1672 sbi->s_desc_per_block_bits = log2(EXT4_DESC_PER_BLOCK(sb));
1673 for (i=0; i < 4; i++)
1674 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
1675 sbi->s_def_hash_version = es->s_def_hash_version;
1676
1677 if (sbi->s_blocks_per_group > blocksize * 8) {
1678 printk (KERN_ERR
1679 "EXT4-fs: #blocks per group too big: %lu\n",
1680 sbi->s_blocks_per_group);
1681 goto failed_mount;
1682 }
1683 if (sbi->s_frags_per_group > blocksize * 8) {
1684 printk (KERN_ERR
1685 "EXT4-fs: #fragments per group too big: %lu\n",
1686 sbi->s_frags_per_group);
1687 goto failed_mount;
1688 }
1689 if (sbi->s_inodes_per_group > blocksize * 8) {
1690 printk (KERN_ERR
1691 "EXT4-fs: #inodes per group too big: %lu\n",
1692 sbi->s_inodes_per_group);
1693 goto failed_mount;
1694 }
1695
1696 if (ext4_blocks_count(es) >
1697 (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) {
1698 printk(KERN_ERR "EXT4-fs: filesystem on %s:"
1699 " too large to mount safely\n", sb->s_id);
1700 if (sizeof(sector_t) < 8)
1701 printk(KERN_WARNING "EXT4-fs: CONFIG_LBD not "
1702 "enabled\n");
1703 goto failed_mount;
1704 }
1705
1706 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
1707 goto cantfind_ext4;
1708 blocks_count = (ext4_blocks_count(es) -
1709 le32_to_cpu(es->s_first_data_block) +
1710 EXT4_BLOCKS_PER_GROUP(sb) - 1);
1711 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
1712 sbi->s_groups_count = blocks_count;
1713 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
1714 EXT4_DESC_PER_BLOCK(sb);
1715 sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
1716 GFP_KERNEL);
1717 if (sbi->s_group_desc == NULL) {
1718 printk (KERN_ERR "EXT4-fs: not enough memory\n");
1719 goto failed_mount;
1720 }
1721
1722 bgl_lock_init(&sbi->s_blockgroup_lock);
1723
1724 for (i = 0; i < db_count; i++) {
1725 block = descriptor_loc(sb, logical_sb_block, i);
1726 sbi->s_group_desc[i] = sb_bread(sb, block);
1727 if (!sbi->s_group_desc[i]) {
1728 printk (KERN_ERR "EXT4-fs: "
1729 "can't read group descriptor %d\n", i);
1730 db_count = i;
1731 goto failed_mount2;
1732 }
1733 }
1734 if (!ext4_check_descriptors (sb)) {
1735 printk(KERN_ERR "EXT4-fs: group descriptors corrupted!\n");
1736 goto failed_mount2;
1737 }
1738 sbi->s_gdb_count = db_count;
1739 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1740 spin_lock_init(&sbi->s_next_gen_lock);
1741
1742 percpu_counter_init(&sbi->s_freeblocks_counter,
1743 ext4_count_free_blocks(sb));
1744 percpu_counter_init(&sbi->s_freeinodes_counter,
1745 ext4_count_free_inodes(sb));
1746 percpu_counter_init(&sbi->s_dirs_counter,
1747 ext4_count_dirs(sb));
1748
1749 /* per fileystem reservation list head & lock */
1750 spin_lock_init(&sbi->s_rsv_window_lock);
1751 sbi->s_rsv_window_root = RB_ROOT;
1752 /* Add a single, static dummy reservation to the start of the
1753 * reservation window list --- it gives us a placeholder for
1754 * append-at-start-of-list which makes the allocation logic
1755 * _much_ simpler. */
1756 sbi->s_rsv_window_head.rsv_start = EXT4_RESERVE_WINDOW_NOT_ALLOCATED;
1757 sbi->s_rsv_window_head.rsv_end = EXT4_RESERVE_WINDOW_NOT_ALLOCATED;
1758 sbi->s_rsv_window_head.rsv_alloc_hit = 0;
1759 sbi->s_rsv_window_head.rsv_goal_size = 0;
1760 ext4_rsv_window_add(sb, &sbi->s_rsv_window_head);
1761
1762 /*
1763 * set up enough so that it can read an inode
1764 */
1765 sb->s_op = &ext4_sops;
1766 sb->s_export_op = &ext4_export_ops;
1767 sb->s_xattr = ext4_xattr_handlers;
1768 #ifdef CONFIG_QUOTA
1769 sb->s_qcop = &ext4_qctl_operations;
1770 sb->dq_op = &ext4_quota_operations;
1771 #endif
1772 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
1773
1774 sb->s_root = NULL;
1775
1776 needs_recovery = (es->s_last_orphan != 0 ||
1777 EXT4_HAS_INCOMPAT_FEATURE(sb,
1778 EXT4_FEATURE_INCOMPAT_RECOVER));
1779
1780 /*
1781 * The first inode we look at is the journal inode. Don't try
1782 * root first: it may be modified in the journal!
1783 */
1784 if (!test_opt(sb, NOLOAD) &&
1785 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
1786 if (ext4_load_journal(sb, es, journal_devnum))
1787 goto failed_mount3;
1788 } else if (journal_inum) {
1789 if (ext4_create_journal(sb, es, journal_inum))
1790 goto failed_mount3;
1791 } else {
1792 if (!silent)
1793 printk (KERN_ERR
1794 "ext4: No journal on filesystem on %s\n",
1795 sb->s_id);
1796 goto failed_mount3;
1797 }
1798
1799 /* We have now updated the journal if required, so we can
1800 * validate the data journaling mode. */
1801 switch (test_opt(sb, DATA_FLAGS)) {
1802 case 0:
1803 /* No mode set, assume a default based on the journal
1804 * capabilities: ORDERED_DATA if the journal can
1805 * cope, else JOURNAL_DATA
1806 */
1807 if (jbd2_journal_check_available_features
1808 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
1809 set_opt(sbi->s_mount_opt, ORDERED_DATA);
1810 else
1811 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
1812 break;
1813
1814 case EXT4_MOUNT_ORDERED_DATA:
1815 case EXT4_MOUNT_WRITEBACK_DATA:
1816 if (!jbd2_journal_check_available_features
1817 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
1818 printk(KERN_ERR "EXT4-fs: Journal does not support "
1819 "requested data journaling mode\n");
1820 goto failed_mount4;
1821 }
1822 default:
1823 break;
1824 }
1825
1826 if (test_opt(sb, NOBH)) {
1827 if (!(test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)) {
1828 printk(KERN_WARNING "EXT4-fs: Ignoring nobh option - "
1829 "its supported only with writeback mode\n");
1830 clear_opt(sbi->s_mount_opt, NOBH);
1831 }
1832 }
1833 /*
1834 * The jbd2_journal_load will have done any necessary log recovery,
1835 * so we can safely mount the rest of the filesystem now.
1836 */
1837
1838 root = iget(sb, EXT4_ROOT_INO);
1839 sb->s_root = d_alloc_root(root);
1840 if (!sb->s_root) {
1841 printk(KERN_ERR "EXT4-fs: get root inode failed\n");
1842 iput(root);
1843 goto failed_mount4;
1844 }
1845 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1846 dput(sb->s_root);
1847 sb->s_root = NULL;
1848 printk(KERN_ERR "EXT4-fs: corrupt root inode, run e2fsck\n");
1849 goto failed_mount4;
1850 }
1851
1852 ext4_setup_super (sb, es, sb->s_flags & MS_RDONLY);
1853 /*
1854 * akpm: core read_super() calls in here with the superblock locked.
1855 * That deadlocks, because orphan cleanup needs to lock the superblock
1856 * in numerous places. Here we just pop the lock - it's relatively
1857 * harmless, because we are now ready to accept write_super() requests,
1858 * and aviro says that's the only reason for hanging onto the
1859 * superblock lock.
1860 */
1861 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
1862 ext4_orphan_cleanup(sb, es);
1863 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
1864 if (needs_recovery)
1865 printk (KERN_INFO "EXT4-fs: recovery complete.\n");
1866 ext4_mark_recovery_complete(sb, es);
1867 printk (KERN_INFO "EXT4-fs: mounted filesystem with %s data mode.\n",
1868 test_opt(sb,DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA ? "journal":
1869 test_opt(sb,DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA ? "ordered":
1870 "writeback");
1871
1872 ext4_ext_init(sb);
1873
1874 lock_kernel();
1875 return 0;
1876
1877 cantfind_ext4:
1878 if (!silent)
1879 printk(KERN_ERR "VFS: Can't find ext4 filesystem on dev %s.\n",
1880 sb->s_id);
1881 goto failed_mount;
1882
1883 failed_mount4:
1884 jbd2_journal_destroy(sbi->s_journal);
1885 failed_mount3:
1886 percpu_counter_destroy(&sbi->s_freeblocks_counter);
1887 percpu_counter_destroy(&sbi->s_freeinodes_counter);
1888 percpu_counter_destroy(&sbi->s_dirs_counter);
1889 failed_mount2:
1890 for (i = 0; i < db_count; i++)
1891 brelse(sbi->s_group_desc[i]);
1892 kfree(sbi->s_group_desc);
1893 failed_mount:
1894 #ifdef CONFIG_QUOTA
1895 for (i = 0; i < MAXQUOTAS; i++)
1896 kfree(sbi->s_qf_names[i]);
1897 #endif
1898 ext4_blkdev_remove(sbi);
1899 brelse(bh);
1900 out_fail:
1901 sb->s_fs_info = NULL;
1902 kfree(sbi);
1903 lock_kernel();
1904 return -EINVAL;
1905 }
1906
1907 /*
1908 * Setup any per-fs journal parameters now. We'll do this both on
1909 * initial mount, once the journal has been initialised but before we've
1910 * done any recovery; and again on any subsequent remount.
1911 */
1912 static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
1913 {
1914 struct ext4_sb_info *sbi = EXT4_SB(sb);
1915
1916 if (sbi->s_commit_interval)
1917 journal->j_commit_interval = sbi->s_commit_interval;
1918 /* We could also set up an ext4-specific default for the commit
1919 * interval here, but for now we'll just fall back to the jbd
1920 * default. */
1921
1922 spin_lock(&journal->j_state_lock);
1923 if (test_opt(sb, BARRIER))
1924 journal->j_flags |= JBD2_BARRIER;
1925 else
1926 journal->j_flags &= ~JBD2_BARRIER;
1927 spin_unlock(&journal->j_state_lock);
1928 }
1929
1930 static journal_t *ext4_get_journal(struct super_block *sb,
1931 unsigned int journal_inum)
1932 {
1933 struct inode *journal_inode;
1934 journal_t *journal;
1935
1936 /* First, test for the existence of a valid inode on disk. Bad
1937 * things happen if we iget() an unused inode, as the subsequent
1938 * iput() will try to delete it. */
1939
1940 journal_inode = iget(sb, journal_inum);
1941 if (!journal_inode) {
1942 printk(KERN_ERR "EXT4-fs: no journal found.\n");
1943 return NULL;
1944 }
1945 if (!journal_inode->i_nlink) {
1946 make_bad_inode(journal_inode);
1947 iput(journal_inode);
1948 printk(KERN_ERR "EXT4-fs: journal inode is deleted.\n");
1949 return NULL;
1950 }
1951
1952 jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
1953 journal_inode, journal_inode->i_size);
1954 if (is_bad_inode(journal_inode) || !S_ISREG(journal_inode->i_mode)) {
1955 printk(KERN_ERR "EXT4-fs: invalid journal inode.\n");
1956 iput(journal_inode);
1957 return NULL;
1958 }
1959
1960 journal = jbd2_journal_init_inode(journal_inode);
1961 if (!journal) {
1962 printk(KERN_ERR "EXT4-fs: Could not load journal inode\n");
1963 iput(journal_inode);
1964 return NULL;
1965 }
1966 journal->j_private = sb;
1967 ext4_init_journal_params(sb, journal);
1968 return journal;
1969 }
1970
1971 static journal_t *ext4_get_dev_journal(struct super_block *sb,
1972 dev_t j_dev)
1973 {
1974 struct buffer_head * bh;
1975 journal_t *journal;
1976 ext4_fsblk_t start;
1977 ext4_fsblk_t len;
1978 int hblock, blocksize;
1979 ext4_fsblk_t sb_block;
1980 unsigned long offset;
1981 struct ext4_super_block * es;
1982 struct block_device *bdev;
1983
1984 bdev = ext4_blkdev_get(j_dev);
1985 if (bdev == NULL)
1986 return NULL;
1987
1988 if (bd_claim(bdev, sb)) {
1989 printk(KERN_ERR
1990 "EXT4: failed to claim external journal device.\n");
1991 blkdev_put(bdev);
1992 return NULL;
1993 }
1994
1995 blocksize = sb->s_blocksize;
1996 hblock = bdev_hardsect_size(bdev);
1997 if (blocksize < hblock) {
1998 printk(KERN_ERR
1999 "EXT4-fs: blocksize too small for journal device.\n");
2000 goto out_bdev;
2001 }
2002
2003 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
2004 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
2005 set_blocksize(bdev, blocksize);
2006 if (!(bh = __bread(bdev, sb_block, blocksize))) {
2007 printk(KERN_ERR "EXT4-fs: couldn't read superblock of "
2008 "external journal\n");
2009 goto out_bdev;
2010 }
2011
2012 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
2013 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
2014 !(le32_to_cpu(es->s_feature_incompat) &
2015 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
2016 printk(KERN_ERR "EXT4-fs: external journal has "
2017 "bad superblock\n");
2018 brelse(bh);
2019 goto out_bdev;
2020 }
2021
2022 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
2023 printk(KERN_ERR "EXT4-fs: journal UUID does not match\n");
2024 brelse(bh);
2025 goto out_bdev;
2026 }
2027
2028 len = ext4_blocks_count(es);
2029 start = sb_block + 1;
2030 brelse(bh); /* we're done with the superblock */
2031
2032 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
2033 start, len, blocksize);
2034 if (!journal) {
2035 printk(KERN_ERR "EXT4-fs: failed to create device journal\n");
2036 goto out_bdev;
2037 }
2038 journal->j_private = sb;
2039 ll_rw_block(READ, 1, &journal->j_sb_buffer);
2040 wait_on_buffer(journal->j_sb_buffer);
2041 if (!buffer_uptodate(journal->j_sb_buffer)) {
2042 printk(KERN_ERR "EXT4-fs: I/O error on journal device\n");
2043 goto out_journal;
2044 }
2045 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
2046 printk(KERN_ERR "EXT4-fs: External journal has more than one "
2047 "user (unsupported) - %d\n",
2048 be32_to_cpu(journal->j_superblock->s_nr_users));
2049 goto out_journal;
2050 }
2051 EXT4_SB(sb)->journal_bdev = bdev;
2052 ext4_init_journal_params(sb, journal);
2053 return journal;
2054 out_journal:
2055 jbd2_journal_destroy(journal);
2056 out_bdev:
2057 ext4_blkdev_put(bdev);
2058 return NULL;
2059 }
2060
2061 static int ext4_load_journal(struct super_block *sb,
2062 struct ext4_super_block *es,
2063 unsigned long journal_devnum)
2064 {
2065 journal_t *journal;
2066 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
2067 dev_t journal_dev;
2068 int err = 0;
2069 int really_read_only;
2070
2071 if (journal_devnum &&
2072 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2073 printk(KERN_INFO "EXT4-fs: external journal device major/minor "
2074 "numbers have changed\n");
2075 journal_dev = new_decode_dev(journal_devnum);
2076 } else
2077 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
2078
2079 really_read_only = bdev_read_only(sb->s_bdev);
2080
2081 /*
2082 * Are we loading a blank journal or performing recovery after a
2083 * crash? For recovery, we need to check in advance whether we
2084 * can get read-write access to the device.
2085 */
2086
2087 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
2088 if (sb->s_flags & MS_RDONLY) {
2089 printk(KERN_INFO "EXT4-fs: INFO: recovery "
2090 "required on readonly filesystem.\n");
2091 if (really_read_only) {
2092 printk(KERN_ERR "EXT4-fs: write access "
2093 "unavailable, cannot proceed.\n");
2094 return -EROFS;
2095 }
2096 printk (KERN_INFO "EXT4-fs: write access will "
2097 "be enabled during recovery.\n");
2098 }
2099 }
2100
2101 if (journal_inum && journal_dev) {
2102 printk(KERN_ERR "EXT4-fs: filesystem has both journal "
2103 "and inode journals!\n");
2104 return -EINVAL;
2105 }
2106
2107 if (journal_inum) {
2108 if (!(journal = ext4_get_journal(sb, journal_inum)))
2109 return -EINVAL;
2110 } else {
2111 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
2112 return -EINVAL;
2113 }
2114
2115 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
2116 err = jbd2_journal_update_format(journal);
2117 if (err) {
2118 printk(KERN_ERR "EXT4-fs: error updating journal.\n");
2119 jbd2_journal_destroy(journal);
2120 return err;
2121 }
2122 }
2123
2124 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
2125 err = jbd2_journal_wipe(journal, !really_read_only);
2126 if (!err)
2127 err = jbd2_journal_load(journal);
2128
2129 if (err) {
2130 printk(KERN_ERR "EXT4-fs: error loading journal.\n");
2131 jbd2_journal_destroy(journal);
2132 return err;
2133 }
2134
2135 EXT4_SB(sb)->s_journal = journal;
2136 ext4_clear_journal_err(sb, es);
2137
2138 if (journal_devnum &&
2139 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2140 es->s_journal_dev = cpu_to_le32(journal_devnum);
2141 sb->s_dirt = 1;
2142
2143 /* Make sure we flush the recovery flag to disk. */
2144 ext4_commit_super(sb, es, 1);
2145 }
2146
2147 return 0;
2148 }
2149
2150 static int ext4_create_journal(struct super_block * sb,
2151 struct ext4_super_block * es,
2152 unsigned int journal_inum)
2153 {
2154 journal_t *journal;
2155
2156 if (sb->s_flags & MS_RDONLY) {
2157 printk(KERN_ERR "EXT4-fs: readonly filesystem when trying to "
2158 "create journal.\n");
2159 return -EROFS;
2160 }
2161
2162 if (!(journal = ext4_get_journal(sb, journal_inum)))
2163 return -EINVAL;
2164
2165 printk(KERN_INFO "EXT4-fs: creating new journal on inode %u\n",
2166 journal_inum);
2167
2168 if (jbd2_journal_create(journal)) {
2169 printk(KERN_ERR "EXT4-fs: error creating journal.\n");
2170 jbd2_journal_destroy(journal);
2171 return -EIO;
2172 }
2173
2174 EXT4_SB(sb)->s_journal = journal;
2175
2176 ext4_update_dynamic_rev(sb);
2177 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2178 EXT4_SET_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL);
2179
2180 es->s_journal_inum = cpu_to_le32(journal_inum);
2181 sb->s_dirt = 1;
2182
2183 /* Make sure we flush the recovery flag to disk. */
2184 ext4_commit_super(sb, es, 1);
2185
2186 return 0;
2187 }
2188
2189 static void ext4_commit_super (struct super_block * sb,
2190 struct ext4_super_block * es,
2191 int sync)
2192 {
2193 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
2194
2195 if (!sbh)
2196 return;
2197 es->s_wtime = cpu_to_le32(get_seconds());
2198 ext4_free_blocks_count_set(es, ext4_count_free_blocks(sb));
2199 es->s_free_inodes_count = cpu_to_le32(ext4_count_free_inodes(sb));
2200 BUFFER_TRACE(sbh, "marking dirty");
2201 mark_buffer_dirty(sbh);
2202 if (sync)
2203 sync_dirty_buffer(sbh);
2204 }
2205
2206
2207 /*
2208 * Have we just finished recovery? If so, and if we are mounting (or
2209 * remounting) the filesystem readonly, then we will end up with a
2210 * consistent fs on disk. Record that fact.
2211 */
2212 static void ext4_mark_recovery_complete(struct super_block * sb,
2213 struct ext4_super_block * es)
2214 {
2215 journal_t *journal = EXT4_SB(sb)->s_journal;
2216
2217 jbd2_journal_lock_updates(journal);
2218 jbd2_journal_flush(journal);
2219 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
2220 sb->s_flags & MS_RDONLY) {
2221 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2222 sb->s_dirt = 0;
2223 ext4_commit_super(sb, es, 1);
2224 }
2225 jbd2_journal_unlock_updates(journal);
2226 }
2227
2228 /*
2229 * If we are mounting (or read-write remounting) a filesystem whose journal
2230 * has recorded an error from a previous lifetime, move that error to the
2231 * main filesystem now.
2232 */
2233 static void ext4_clear_journal_err(struct super_block * sb,
2234 struct ext4_super_block * es)
2235 {
2236 journal_t *journal;
2237 int j_errno;
2238 const char *errstr;
2239
2240 journal = EXT4_SB(sb)->s_journal;
2241
2242 /*
2243 * Now check for any error status which may have been recorded in the
2244 * journal by a prior ext4_error() or ext4_abort()
2245 */
2246
2247 j_errno = jbd2_journal_errno(journal);
2248 if (j_errno) {
2249 char nbuf[16];
2250
2251 errstr = ext4_decode_error(sb, j_errno, nbuf);
2252 ext4_warning(sb, __FUNCTION__, "Filesystem error recorded "
2253 "from previous mount: %s", errstr);
2254 ext4_warning(sb, __FUNCTION__, "Marking fs in need of "
2255 "filesystem check.");
2256
2257 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
2258 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
2259 ext4_commit_super (sb, es, 1);
2260
2261 jbd2_journal_clear_err(journal);
2262 }
2263 }
2264
2265 /*
2266 * Force the running and committing transactions to commit,
2267 * and wait on the commit.
2268 */
2269 int ext4_force_commit(struct super_block *sb)
2270 {
2271 journal_t *journal;
2272 int ret;
2273
2274 if (sb->s_flags & MS_RDONLY)
2275 return 0;
2276
2277 journal = EXT4_SB(sb)->s_journal;
2278 sb->s_dirt = 0;
2279 ret = ext4_journal_force_commit(journal);
2280 return ret;
2281 }
2282
2283 /*
2284 * Ext4 always journals updates to the superblock itself, so we don't
2285 * have to propagate any other updates to the superblock on disk at this
2286 * point. Just start an async writeback to get the buffers on their way
2287 * to the disk.
2288 *
2289 * This implicitly triggers the writebehind on sync().
2290 */
2291
2292 static void ext4_write_super (struct super_block * sb)
2293 {
2294 if (mutex_trylock(&sb->s_lock) != 0)
2295 BUG();
2296 sb->s_dirt = 0;
2297 }
2298
2299 static int ext4_sync_fs(struct super_block *sb, int wait)
2300 {
2301 tid_t target;
2302
2303 sb->s_dirt = 0;
2304 if (jbd2_journal_start_commit(EXT4_SB(sb)->s_journal, &target)) {
2305 if (wait)
2306 jbd2_log_wait_commit(EXT4_SB(sb)->s_journal, target);
2307 }
2308 return 0;
2309 }
2310
2311 /*
2312 * LVM calls this function before a (read-only) snapshot is created. This
2313 * gives us a chance to flush the journal completely and mark the fs clean.
2314 */
2315 static void ext4_write_super_lockfs(struct super_block *sb)
2316 {
2317 sb->s_dirt = 0;
2318
2319 if (!(sb->s_flags & MS_RDONLY)) {
2320 journal_t *journal = EXT4_SB(sb)->s_journal;
2321
2322 /* Now we set up the journal barrier. */
2323 jbd2_journal_lock_updates(journal);
2324 jbd2_journal_flush(journal);
2325
2326 /* Journal blocked and flushed, clear needs_recovery flag. */
2327 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2328 ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1);
2329 }
2330 }
2331
2332 /*
2333 * Called by LVM after the snapshot is done. We need to reset the RECOVER
2334 * flag here, even though the filesystem is not technically dirty yet.
2335 */
2336 static void ext4_unlockfs(struct super_block *sb)
2337 {
2338 if (!(sb->s_flags & MS_RDONLY)) {
2339 lock_super(sb);
2340 /* Reser the needs_recovery flag before the fs is unlocked. */
2341 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2342 ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1);
2343 unlock_super(sb);
2344 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
2345 }
2346 }
2347
2348 static int ext4_remount (struct super_block * sb, int * flags, char * data)
2349 {
2350 struct ext4_super_block * es;
2351 struct ext4_sb_info *sbi = EXT4_SB(sb);
2352 ext4_fsblk_t n_blocks_count = 0;
2353 unsigned long old_sb_flags;
2354 struct ext4_mount_options old_opts;
2355 int err;
2356 #ifdef CONFIG_QUOTA
2357 int i;
2358 #endif
2359
2360 /* Store the original options */
2361 old_sb_flags = sb->s_flags;
2362 old_opts.s_mount_opt = sbi->s_mount_opt;
2363 old_opts.s_resuid = sbi->s_resuid;
2364 old_opts.s_resgid = sbi->s_resgid;
2365 old_opts.s_commit_interval = sbi->s_commit_interval;
2366 #ifdef CONFIG_QUOTA
2367 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
2368 for (i = 0; i < MAXQUOTAS; i++)
2369 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
2370 #endif
2371
2372 /*
2373 * Allow the "check" option to be passed as a remount option.
2374 */
2375 if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
2376 err = -EINVAL;
2377 goto restore_opts;
2378 }
2379
2380 if (sbi->s_mount_opt & EXT4_MOUNT_ABORT)
2381 ext4_abort(sb, __FUNCTION__, "Abort forced by user");
2382
2383 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
2384 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
2385
2386 es = sbi->s_es;
2387
2388 ext4_init_journal_params(sb, sbi->s_journal);
2389
2390 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
2391 n_blocks_count > ext4_blocks_count(es)) {
2392 if (sbi->s_mount_opt & EXT4_MOUNT_ABORT) {
2393 err = -EROFS;
2394 goto restore_opts;
2395 }
2396
2397 if (*flags & MS_RDONLY) {
2398 /*
2399 * First of all, the unconditional stuff we have to do
2400 * to disable replay of the journal when we next remount
2401 */
2402 sb->s_flags |= MS_RDONLY;
2403
2404 /*
2405 * OK, test if we are remounting a valid rw partition
2406 * readonly, and if so set the rdonly flag and then
2407 * mark the partition as valid again.
2408 */
2409 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
2410 (sbi->s_mount_state & EXT4_VALID_FS))
2411 es->s_state = cpu_to_le16(sbi->s_mount_state);
2412
2413 ext4_mark_recovery_complete(sb, es);
2414 } else {
2415 __le32 ret;
2416 if ((ret = EXT4_HAS_RO_COMPAT_FEATURE(sb,
2417 ~EXT4_FEATURE_RO_COMPAT_SUPP))) {
2418 printk(KERN_WARNING "EXT4-fs: %s: couldn't "
2419 "remount RDWR because of unsupported "
2420 "optional features (%x).\n",
2421 sb->s_id, le32_to_cpu(ret));
2422 err = -EROFS;
2423 goto restore_opts;
2424 }
2425
2426 /*
2427 * If we have an unprocessed orphan list hanging
2428 * around from a previously readonly bdev mount,
2429 * require a full umount/remount for now.
2430 */
2431 if (es->s_last_orphan) {
2432 printk(KERN_WARNING "EXT4-fs: %s: couldn't "
2433 "remount RDWR because of unprocessed "
2434 "orphan inode list. Please "
2435 "umount/remount instead.\n",
2436 sb->s_id);
2437 err = -EINVAL;
2438 goto restore_opts;
2439 }
2440
2441 /*
2442 * Mounting a RDONLY partition read-write, so reread
2443 * and store the current valid flag. (It may have
2444 * been changed by e2fsck since we originally mounted
2445 * the partition.)
2446 */
2447 ext4_clear_journal_err(sb, es);
2448 sbi->s_mount_state = le16_to_cpu(es->s_state);
2449 if ((err = ext4_group_extend(sb, es, n_blocks_count)))
2450 goto restore_opts;
2451 if (!ext4_setup_super (sb, es, 0))
2452 sb->s_flags &= ~MS_RDONLY;
2453 }
2454 }
2455 #ifdef CONFIG_QUOTA
2456 /* Release old quota file names */
2457 for (i = 0; i < MAXQUOTAS; i++)
2458 if (old_opts.s_qf_names[i] &&
2459 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2460 kfree(old_opts.s_qf_names[i]);
2461 #endif
2462 return 0;
2463 restore_opts:
2464 sb->s_flags = old_sb_flags;
2465 sbi->s_mount_opt = old_opts.s_mount_opt;
2466 sbi->s_resuid = old_opts.s_resuid;
2467 sbi->s_resgid = old_opts.s_resgid;
2468 sbi->s_commit_interval = old_opts.s_commit_interval;
2469 #ifdef CONFIG_QUOTA
2470 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
2471 for (i = 0; i < MAXQUOTAS; i++) {
2472 if (sbi->s_qf_names[i] &&
2473 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2474 kfree(sbi->s_qf_names[i]);
2475 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
2476 }
2477 #endif
2478 return err;
2479 }
2480
2481 static int ext4_statfs (struct dentry * dentry, struct kstatfs * buf)
2482 {
2483 struct super_block *sb = dentry->d_sb;
2484 struct ext4_sb_info *sbi = EXT4_SB(sb);
2485 struct ext4_super_block *es = sbi->s_es;
2486 ext4_fsblk_t overhead;
2487 int i;
2488 u64 fsid;
2489
2490 if (test_opt (sb, MINIX_DF))
2491 overhead = 0;
2492 else {
2493 unsigned long ngroups;
2494 ngroups = EXT4_SB(sb)->s_groups_count;
2495 smp_rmb();
2496
2497 /*
2498 * Compute the overhead (FS structures)
2499 */
2500
2501 /*
2502 * All of the blocks before first_data_block are
2503 * overhead
2504 */
2505 overhead = le32_to_cpu(es->s_first_data_block);
2506
2507 /*
2508 * Add the overhead attributed to the superblock and
2509 * block group descriptors. If the sparse superblocks
2510 * feature is turned on, then not all groups have this.
2511 */
2512 for (i = 0; i < ngroups; i++) {
2513 overhead += ext4_bg_has_super(sb, i) +
2514 ext4_bg_num_gdb(sb, i);
2515 cond_resched();
2516 }
2517
2518 /*
2519 * Every block group has an inode bitmap, a block
2520 * bitmap, and an inode table.
2521 */
2522 overhead += (ngroups * (2 + EXT4_SB(sb)->s_itb_per_group));
2523 }
2524
2525 buf->f_type = EXT4_SUPER_MAGIC;
2526 buf->f_bsize = sb->s_blocksize;
2527 buf->f_blocks = ext4_blocks_count(es) - overhead;
2528 buf->f_bfree = percpu_counter_sum(&sbi->s_freeblocks_counter);
2529 buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es);
2530 if (buf->f_bfree < ext4_r_blocks_count(es))
2531 buf->f_bavail = 0;
2532 buf->f_files = le32_to_cpu(es->s_inodes_count);
2533 buf->f_ffree = percpu_counter_sum(&sbi->s_freeinodes_counter);
2534 buf->f_namelen = EXT4_NAME_LEN;
2535 fsid = le64_to_cpup((void *)es->s_uuid) ^
2536 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
2537 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
2538 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
2539 return 0;
2540 }
2541
2542 /* Helper function for writing quotas on sync - we need to start transaction before quota file
2543 * is locked for write. Otherwise the are possible deadlocks:
2544 * Process 1 Process 2
2545 * ext4_create() quota_sync()
2546 * jbd2_journal_start() write_dquot()
2547 * DQUOT_INIT() down(dqio_mutex)
2548 * down(dqio_mutex) jbd2_journal_start()
2549 *
2550 */
2551
2552 #ifdef CONFIG_QUOTA
2553
2554 static inline struct inode *dquot_to_inode(struct dquot *dquot)
2555 {
2556 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
2557 }
2558
2559 static int ext4_dquot_initialize(struct inode *inode, int type)
2560 {
2561 handle_t *handle;
2562 int ret, err;
2563
2564 /* We may create quota structure so we need to reserve enough blocks */
2565 handle = ext4_journal_start(inode, 2*EXT4_QUOTA_INIT_BLOCKS(inode->i_sb));
2566 if (IS_ERR(handle))
2567 return PTR_ERR(handle);
2568 ret = dquot_initialize(inode, type);
2569 err = ext4_journal_stop(handle);
2570 if (!ret)
2571 ret = err;
2572 return ret;
2573 }
2574
2575 static int ext4_dquot_drop(struct inode *inode)
2576 {
2577 handle_t *handle;
2578 int ret, err;
2579
2580 /* We may delete quota structure so we need to reserve enough blocks */
2581 handle = ext4_journal_start(inode, 2*EXT4_QUOTA_DEL_BLOCKS(inode->i_sb));
2582 if (IS_ERR(handle))
2583 return PTR_ERR(handle);
2584 ret = dquot_drop(inode);
2585 err = ext4_journal_stop(handle);
2586 if (!ret)
2587 ret = err;
2588 return ret;
2589 }
2590
2591 static int ext4_write_dquot(struct dquot *dquot)
2592 {
2593 int ret, err;
2594 handle_t *handle;
2595 struct inode *inode;
2596
2597 inode = dquot_to_inode(dquot);
2598 handle = ext4_journal_start(inode,
2599 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2600 if (IS_ERR(handle))
2601 return PTR_ERR(handle);
2602 ret = dquot_commit(dquot);
2603 err = ext4_journal_stop(handle);
2604 if (!ret)
2605 ret = err;
2606 return ret;
2607 }
2608
2609 static int ext4_acquire_dquot(struct dquot *dquot)
2610 {
2611 int ret, err;
2612 handle_t *handle;
2613
2614 handle = ext4_journal_start(dquot_to_inode(dquot),
2615 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2616 if (IS_ERR(handle))
2617 return PTR_ERR(handle);
2618 ret = dquot_acquire(dquot);
2619 err = ext4_journal_stop(handle);
2620 if (!ret)
2621 ret = err;
2622 return ret;
2623 }
2624
2625 static int ext4_release_dquot(struct dquot *dquot)
2626 {
2627 int ret, err;
2628 handle_t *handle;
2629
2630 handle = ext4_journal_start(dquot_to_inode(dquot),
2631 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2632 if (IS_ERR(handle))
2633 return PTR_ERR(handle);
2634 ret = dquot_release(dquot);
2635 err = ext4_journal_stop(handle);
2636 if (!ret)
2637 ret = err;
2638 return ret;
2639 }
2640
2641 static int ext4_mark_dquot_dirty(struct dquot *dquot)
2642 {
2643 /* Are we journalling quotas? */
2644 if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2645 EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2646 dquot_mark_dquot_dirty(dquot);
2647 return ext4_write_dquot(dquot);
2648 } else {
2649 return dquot_mark_dquot_dirty(dquot);
2650 }
2651 }
2652
2653 static int ext4_write_info(struct super_block *sb, int type)
2654 {
2655 int ret, err;
2656 handle_t *handle;
2657
2658 /* Data block + inode block */
2659 handle = ext4_journal_start(sb->s_root->d_inode, 2);
2660 if (IS_ERR(handle))
2661 return PTR_ERR(handle);
2662 ret = dquot_commit_info(sb, type);
2663 err = ext4_journal_stop(handle);
2664 if (!ret)
2665 ret = err;
2666 return ret;
2667 }
2668
2669 /*
2670 * Turn on quotas during mount time - we need to find
2671 * the quota file and such...
2672 */
2673 static int ext4_quota_on_mount(struct super_block *sb, int type)
2674 {
2675 return vfs_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
2676 EXT4_SB(sb)->s_jquota_fmt, type);
2677 }
2678
2679 /*
2680 * Standard function to be called on quota_on
2681 */
2682 static int ext4_quota_on(struct super_block *sb, int type, int format_id,
2683 char *path)
2684 {
2685 int err;
2686 struct nameidata nd;
2687
2688 if (!test_opt(sb, QUOTA))
2689 return -EINVAL;
2690 /* Not journalling quota? */
2691 if (!EXT4_SB(sb)->s_qf_names[USRQUOTA] &&
2692 !EXT4_SB(sb)->s_qf_names[GRPQUOTA])
2693 return vfs_quota_on(sb, type, format_id, path);
2694 err = path_lookup(path, LOOKUP_FOLLOW, &nd);
2695 if (err)
2696 return err;
2697 /* Quotafile not on the same filesystem? */
2698 if (nd.mnt->mnt_sb != sb) {
2699 path_release(&nd);
2700 return -EXDEV;
2701 }
2702 /* Quotafile not of fs root? */
2703 if (nd.dentry->d_parent->d_inode != sb->s_root->d_inode)
2704 printk(KERN_WARNING
2705 "EXT4-fs: Quota file not on filesystem root. "
2706 "Journalled quota will not work.\n");
2707 path_release(&nd);
2708 return vfs_quota_on(sb, type, format_id, path);
2709 }
2710
2711 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2712 * acquiring the locks... As quota files are never truncated and quota code
2713 * itself serializes the operations (and noone else should touch the files)
2714 * we don't have to be afraid of races */
2715 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
2716 size_t len, loff_t off)
2717 {
2718 struct inode *inode = sb_dqopt(sb)->files[type];
2719 sector_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
2720 int err = 0;
2721 int offset = off & (sb->s_blocksize - 1);
2722 int tocopy;
2723 size_t toread;
2724 struct buffer_head *bh;
2725 loff_t i_size = i_size_read(inode);
2726
2727 if (off > i_size)
2728 return 0;
2729 if (off+len > i_size)
2730 len = i_size-off;
2731 toread = len;
2732 while (toread > 0) {
2733 tocopy = sb->s_blocksize - offset < toread ?
2734 sb->s_blocksize - offset : toread;
2735 bh = ext4_bread(NULL, inode, blk, 0, &err);
2736 if (err)
2737 return err;
2738 if (!bh) /* A hole? */
2739 memset(data, 0, tocopy);
2740 else
2741 memcpy(data, bh->b_data+offset, tocopy);
2742 brelse(bh);
2743 offset = 0;
2744 toread -= tocopy;
2745 data += tocopy;
2746 blk++;
2747 }
2748 return len;
2749 }
2750
2751 /* Write to quotafile (we know the transaction is already started and has
2752 * enough credits) */
2753 static ssize_t ext4_quota_write(struct super_block *sb, int type,
2754 const char *data, size_t len, loff_t off)
2755 {
2756 struct inode *inode = sb_dqopt(sb)->files[type];
2757 sector_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
2758 int err = 0;
2759 int offset = off & (sb->s_blocksize - 1);
2760 int tocopy;
2761 int journal_quota = EXT4_SB(sb)->s_qf_names[type] != NULL;
2762 size_t towrite = len;
2763 struct buffer_head *bh;
2764 handle_t *handle = journal_current_handle();
2765
2766 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
2767 while (towrite > 0) {
2768 tocopy = sb->s_blocksize - offset < towrite ?
2769 sb->s_blocksize - offset : towrite;
2770 bh = ext4_bread(handle, inode, blk, 1, &err);
2771 if (!bh)
2772 goto out;
2773 if (journal_quota) {
2774 err = ext4_journal_get_write_access(handle, bh);
2775 if (err) {
2776 brelse(bh);
2777 goto out;
2778 }
2779 }
2780 lock_buffer(bh);
2781 memcpy(bh->b_data+offset, data, tocopy);
2782 flush_dcache_page(bh->b_page);
2783 unlock_buffer(bh);
2784 if (journal_quota)
2785 err = ext4_journal_dirty_metadata(handle, bh);
2786 else {
2787 /* Always do at least ordered writes for quotas */
2788 err = ext4_journal_dirty_data(handle, bh);
2789 mark_buffer_dirty(bh);
2790 }
2791 brelse(bh);
2792 if (err)
2793 goto out;
2794 offset = 0;
2795 towrite -= tocopy;
2796 data += tocopy;
2797 blk++;
2798 }
2799 out:
2800 if (len == towrite)
2801 return err;
2802 if (inode->i_size < off+len-towrite) {
2803 i_size_write(inode, off+len-towrite);
2804 EXT4_I(inode)->i_disksize = inode->i_size;
2805 }
2806 inode->i_version++;
2807 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2808 ext4_mark_inode_dirty(handle, inode);
2809 mutex_unlock(&inode->i_mutex);
2810 return len - towrite;
2811 }
2812
2813 #endif
2814
2815 static int ext4_get_sb(struct file_system_type *fs_type,
2816 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
2817 {
2818 return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super, mnt);
2819 }
2820
2821 static struct file_system_type ext4dev_fs_type = {
2822 .owner = THIS_MODULE,
2823 .name = "ext4dev",
2824 .get_sb = ext4_get_sb,
2825 .kill_sb = kill_block_super,
2826 .fs_flags = FS_REQUIRES_DEV,
2827 };
2828
2829 static int __init init_ext4_fs(void)
2830 {
2831 int err = init_ext4_xattr();
2832 if (err)
2833 return err;
2834 err = init_inodecache();
2835 if (err)
2836 goto out1;
2837 err = register_filesystem(&ext4dev_fs_type);
2838 if (err)
2839 goto out;
2840 return 0;
2841 out:
2842 destroy_inodecache();
2843 out1:
2844 exit_ext4_xattr();
2845 return err;
2846 }
2847
2848 static void __exit exit_ext4_fs(void)
2849 {
2850 unregister_filesystem(&ext4dev_fs_type);
2851 destroy_inodecache();
2852 exit_ext4_xattr();
2853 }
2854
2855 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
2856 MODULE_DESCRIPTION("Fourth Extended Filesystem with extents");
2857 MODULE_LICENSE("GPL");
2858 module_init(init_ext4_fs)
2859 module_exit(exit_ext4_fs)
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