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[PATCH] aio: kill pointless ki_nbytes assignment in aio_setup_single_vector
[linux-2.6/zen-sources.git] / fs / ext4 / super.c
blob486a641ca71b94fa0ed745a246d57285d01611e1
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 if (def_mount_opts & EXT4_DEFM_XATTR_USER)
1522 set_opt(sbi->s_mount_opt, XATTR_USER);
1523 if (def_mount_opts & EXT4_DEFM_ACL)
1524 set_opt(sbi->s_mount_opt, POSIX_ACL);
1525 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
1526 sbi->s_mount_opt |= EXT4_MOUNT_JOURNAL_DATA;
1527 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
1528 sbi->s_mount_opt |= EXT4_MOUNT_ORDERED_DATA;
1529 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
1530 sbi->s_mount_opt |= EXT4_MOUNT_WRITEBACK_DATA;
1531
1532 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
1533 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1534 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_RO)
1535 set_opt(sbi->s_mount_opt, ERRORS_RO);
1536 else
1537 set_opt(sbi->s_mount_opt, ERRORS_CONT);
1538
1539 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
1540 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
1541
1542 set_opt(sbi->s_mount_opt, RESERVATION);
1543
1544 if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
1545 NULL, 0))
1546 goto failed_mount;
1547
1548 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1549 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
1550
1551 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
1552 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
1553 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
1554 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
1555 printk(KERN_WARNING
1556 "EXT4-fs warning: feature flags set on rev 0 fs, "
1557 "running e2fsck is recommended\n");
1558 /*
1559 * Check feature flags regardless of the revision level, since we
1560 * previously didn't change the revision level when setting the flags,
1561 * so there is a chance incompat flags are set on a rev 0 filesystem.
1562 */
1563 features = EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP);
1564 if (features) {
1565 printk(KERN_ERR "EXT4-fs: %s: couldn't mount because of "
1566 "unsupported optional features (%x).\n",
1567 sb->s_id, le32_to_cpu(features));
1568 goto failed_mount;
1569 }
1570 features = EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP);
1571 if (!(sb->s_flags & MS_RDONLY) && features) {
1572 printk(KERN_ERR "EXT4-fs: %s: couldn't mount RDWR because of "
1573 "unsupported optional features (%x).\n",
1574 sb->s_id, le32_to_cpu(features));
1575 goto failed_mount;
1576 }
1577 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
1578
1579 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
1580 blocksize > EXT4_MAX_BLOCK_SIZE) {
1581 printk(KERN_ERR
1582 "EXT4-fs: Unsupported filesystem blocksize %d on %s.\n",
1583 blocksize, sb->s_id);
1584 goto failed_mount;
1585 }
1586
1587 hblock = bdev_hardsect_size(sb->s_bdev);
1588 if (sb->s_blocksize != blocksize) {
1589 /*
1590 * Make sure the blocksize for the filesystem is larger
1591 * than the hardware sectorsize for the machine.
1592 */
1593 if (blocksize < hblock) {
1594 printk(KERN_ERR "EXT4-fs: blocksize %d too small for "
1595 "device blocksize %d.\n", blocksize, hblock);
1596 goto failed_mount;
1597 }
1598
1599 brelse (bh);
1600 sb_set_blocksize(sb, blocksize);
1601 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
1602 offset = do_div(logical_sb_block, blocksize);
1603 bh = sb_bread(sb, logical_sb_block);
1604 if (!bh) {
1605 printk(KERN_ERR
1606 "EXT4-fs: Can't read superblock on 2nd try.\n");
1607 goto failed_mount;
1608 }
1609 es = (struct ext4_super_block *)(((char *)bh->b_data) + offset);
1610 sbi->s_es = es;
1611 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
1612 printk (KERN_ERR
1613 "EXT4-fs: Magic mismatch, very weird !\n");
1614 goto failed_mount;
1615 }
1616 }
1617
1618 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits);
1619
1620 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
1621 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
1622 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
1623 } else {
1624 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
1625 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
1626 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
1627 (sbi->s_inode_size & (sbi->s_inode_size - 1)) ||
1628 (sbi->s_inode_size > blocksize)) {
1629 printk (KERN_ERR
1630 "EXT4-fs: unsupported inode size: %d\n",
1631 sbi->s_inode_size);
1632 goto failed_mount;
1633 }
1634 }
1635 sbi->s_frag_size = EXT4_MIN_FRAG_SIZE <<
1636 le32_to_cpu(es->s_log_frag_size);
1637 if (blocksize != sbi->s_frag_size) {
1638 printk(KERN_ERR
1639 "EXT4-fs: fragsize %lu != blocksize %u (unsupported)\n",
1640 sbi->s_frag_size, blocksize);
1641 goto failed_mount;
1642 }
1643 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
1644 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
1645 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
1646 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
1647 sbi->s_desc_size & (sbi->s_desc_size - 1)) {
1648 printk(KERN_ERR
1649 "EXT4-fs: unsupported descriptor size %lu\n",
1650 sbi->s_desc_size);
1651 goto failed_mount;
1652 }
1653 } else
1654 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
1655 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
1656 sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
1657 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
1658 if (EXT4_INODE_SIZE(sb) == 0)
1659 goto cantfind_ext4;
1660 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
1661 if (sbi->s_inodes_per_block == 0)
1662 goto cantfind_ext4;
1663 sbi->s_itb_per_group = sbi->s_inodes_per_group /
1664 sbi->s_inodes_per_block;
1665 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
1666 sbi->s_sbh = bh;
1667 sbi->s_mount_state = le16_to_cpu(es->s_state);
1668 sbi->s_addr_per_block_bits = log2(EXT4_ADDR_PER_BLOCK(sb));
1669 sbi->s_desc_per_block_bits = log2(EXT4_DESC_PER_BLOCK(sb));
1670 for (i=0; i < 4; i++)
1671 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
1672 sbi->s_def_hash_version = es->s_def_hash_version;
1673
1674 if (sbi->s_blocks_per_group > blocksize * 8) {
1675 printk (KERN_ERR
1676 "EXT4-fs: #blocks per group too big: %lu\n",
1677 sbi->s_blocks_per_group);
1678 goto failed_mount;
1679 }
1680 if (sbi->s_frags_per_group > blocksize * 8) {
1681 printk (KERN_ERR
1682 "EXT4-fs: #fragments per group too big: %lu\n",
1683 sbi->s_frags_per_group);
1684 goto failed_mount;
1685 }
1686 if (sbi->s_inodes_per_group > blocksize * 8) {
1687 printk (KERN_ERR
1688 "EXT4-fs: #inodes per group too big: %lu\n",
1689 sbi->s_inodes_per_group);
1690 goto failed_mount;
1691 }
1692
1693 if (ext4_blocks_count(es) >
1694 (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) {
1695 printk(KERN_ERR "EXT4-fs: filesystem on %s:"
1696 " too large to mount safely\n", sb->s_id);
1697 if (sizeof(sector_t) < 8)
1698 printk(KERN_WARNING "EXT4-fs: CONFIG_LBD not "
1699 "enabled\n");
1700 goto failed_mount;
1701 }
1702
1703 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
1704 goto cantfind_ext4;
1705 blocks_count = (ext4_blocks_count(es) -
1706 le32_to_cpu(es->s_first_data_block) +
1707 EXT4_BLOCKS_PER_GROUP(sb) - 1);
1708 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
1709 sbi->s_groups_count = blocks_count;
1710 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
1711 EXT4_DESC_PER_BLOCK(sb);
1712 sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
1713 GFP_KERNEL);
1714 if (sbi->s_group_desc == NULL) {
1715 printk (KERN_ERR "EXT4-fs: not enough memory\n");
1716 goto failed_mount;
1717 }
1718
1719 bgl_lock_init(&sbi->s_blockgroup_lock);
1720
1721 for (i = 0; i < db_count; i++) {
1722 block = descriptor_loc(sb, logical_sb_block, i);
1723 sbi->s_group_desc[i] = sb_bread(sb, block);
1724 if (!sbi->s_group_desc[i]) {
1725 printk (KERN_ERR "EXT4-fs: "
1726 "can't read group descriptor %d\n", i);
1727 db_count = i;
1728 goto failed_mount2;
1729 }
1730 }
1731 if (!ext4_check_descriptors (sb)) {
1732 printk(KERN_ERR "EXT4-fs: group descriptors corrupted!\n");
1733 goto failed_mount2;
1734 }
1735 sbi->s_gdb_count = db_count;
1736 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1737 spin_lock_init(&sbi->s_next_gen_lock);
1738
1739 percpu_counter_init(&sbi->s_freeblocks_counter,
1740 ext4_count_free_blocks(sb));
1741 percpu_counter_init(&sbi->s_freeinodes_counter,
1742 ext4_count_free_inodes(sb));
1743 percpu_counter_init(&sbi->s_dirs_counter,
1744 ext4_count_dirs(sb));
1745
1746 /* per fileystem reservation list head & lock */
1747 spin_lock_init(&sbi->s_rsv_window_lock);
1748 sbi->s_rsv_window_root = RB_ROOT;
1749 /* Add a single, static dummy reservation to the start of the
1750 * reservation window list --- it gives us a placeholder for
1751 * append-at-start-of-list which makes the allocation logic
1752 * _much_ simpler. */
1753 sbi->s_rsv_window_head.rsv_start = EXT4_RESERVE_WINDOW_NOT_ALLOCATED;
1754 sbi->s_rsv_window_head.rsv_end = EXT4_RESERVE_WINDOW_NOT_ALLOCATED;
1755 sbi->s_rsv_window_head.rsv_alloc_hit = 0;
1756 sbi->s_rsv_window_head.rsv_goal_size = 0;
1757 ext4_rsv_window_add(sb, &sbi->s_rsv_window_head);
1758
1759 /*
1760 * set up enough so that it can read an inode
1761 */
1762 sb->s_op = &ext4_sops;
1763 sb->s_export_op = &ext4_export_ops;
1764 sb->s_xattr = ext4_xattr_handlers;
1765 #ifdef CONFIG_QUOTA
1766 sb->s_qcop = &ext4_qctl_operations;
1767 sb->dq_op = &ext4_quota_operations;
1768 #endif
1769 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
1770
1771 sb->s_root = NULL;
1772
1773 needs_recovery = (es->s_last_orphan != 0 ||
1774 EXT4_HAS_INCOMPAT_FEATURE(sb,
1775 EXT4_FEATURE_INCOMPAT_RECOVER));
1776
1777 /*
1778 * The first inode we look at is the journal inode. Don't try
1779 * root first: it may be modified in the journal!
1780 */
1781 if (!test_opt(sb, NOLOAD) &&
1782 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
1783 if (ext4_load_journal(sb, es, journal_devnum))
1784 goto failed_mount3;
1785 } else if (journal_inum) {
1786 if (ext4_create_journal(sb, es, journal_inum))
1787 goto failed_mount3;
1788 } else {
1789 if (!silent)
1790 printk (KERN_ERR
1791 "ext4: No journal on filesystem on %s\n",
1792 sb->s_id);
1793 goto failed_mount3;
1794 }
1795
1796 /* We have now updated the journal if required, so we can
1797 * validate the data journaling mode. */
1798 switch (test_opt(sb, DATA_FLAGS)) {
1799 case 0:
1800 /* No mode set, assume a default based on the journal
1801 * capabilities: ORDERED_DATA if the journal can
1802 * cope, else JOURNAL_DATA
1803 */
1804 if (jbd2_journal_check_available_features
1805 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
1806 set_opt(sbi->s_mount_opt, ORDERED_DATA);
1807 else
1808 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
1809 break;
1810
1811 case EXT4_MOUNT_ORDERED_DATA:
1812 case EXT4_MOUNT_WRITEBACK_DATA:
1813 if (!jbd2_journal_check_available_features
1814 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
1815 printk(KERN_ERR "EXT4-fs: Journal does not support "
1816 "requested data journaling mode\n");
1817 goto failed_mount4;
1818 }
1819 default:
1820 break;
1821 }
1822
1823 if (test_opt(sb, NOBH)) {
1824 if (!(test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)) {
1825 printk(KERN_WARNING "EXT4-fs: Ignoring nobh option - "
1826 "its supported only with writeback mode\n");
1827 clear_opt(sbi->s_mount_opt, NOBH);
1828 }
1829 }
1830 /*
1831 * The jbd2_journal_load will have done any necessary log recovery,
1832 * so we can safely mount the rest of the filesystem now.
1833 */
1834
1835 root = iget(sb, EXT4_ROOT_INO);
1836 sb->s_root = d_alloc_root(root);
1837 if (!sb->s_root) {
1838 printk(KERN_ERR "EXT4-fs: get root inode failed\n");
1839 iput(root);
1840 goto failed_mount4;
1841 }
1842 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1843 dput(sb->s_root);
1844 sb->s_root = NULL;
1845 printk(KERN_ERR "EXT4-fs: corrupt root inode, run e2fsck\n");
1846 goto failed_mount4;
1847 }
1848
1849 ext4_setup_super (sb, es, sb->s_flags & MS_RDONLY);
1850 /*
1851 * akpm: core read_super() calls in here with the superblock locked.
1852 * That deadlocks, because orphan cleanup needs to lock the superblock
1853 * in numerous places. Here we just pop the lock - it's relatively
1854 * harmless, because we are now ready to accept write_super() requests,
1855 * and aviro says that's the only reason for hanging onto the
1856 * superblock lock.
1857 */
1858 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
1859 ext4_orphan_cleanup(sb, es);
1860 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
1861 if (needs_recovery)
1862 printk (KERN_INFO "EXT4-fs: recovery complete.\n");
1863 ext4_mark_recovery_complete(sb, es);
1864 printk (KERN_INFO "EXT4-fs: mounted filesystem with %s data mode.\n",
1865 test_opt(sb,DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA ? "journal":
1866 test_opt(sb,DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA ? "ordered":
1867 "writeback");
1868
1869 ext4_ext_init(sb);
1870
1871 lock_kernel();
1872 return 0;
1873
1874 cantfind_ext4:
1875 if (!silent)
1876 printk(KERN_ERR "VFS: Can't find ext4 filesystem on dev %s.\n",
1877 sb->s_id);
1878 goto failed_mount;
1879
1880 failed_mount4:
1881 jbd2_journal_destroy(sbi->s_journal);
1882 failed_mount3:
1883 percpu_counter_destroy(&sbi->s_freeblocks_counter);
1884 percpu_counter_destroy(&sbi->s_freeinodes_counter);
1885 percpu_counter_destroy(&sbi->s_dirs_counter);
1886 failed_mount2:
1887 for (i = 0; i < db_count; i++)
1888 brelse(sbi->s_group_desc[i]);
1889 kfree(sbi->s_group_desc);
1890 failed_mount:
1891 #ifdef CONFIG_QUOTA
1892 for (i = 0; i < MAXQUOTAS; i++)
1893 kfree(sbi->s_qf_names[i]);
1894 #endif
1895 ext4_blkdev_remove(sbi);
1896 brelse(bh);
1897 out_fail:
1898 sb->s_fs_info = NULL;
1899 kfree(sbi);
1900 lock_kernel();
1901 return -EINVAL;
1902 }
1903
1904 /*
1905 * Setup any per-fs journal parameters now. We'll do this both on
1906 * initial mount, once the journal has been initialised but before we've
1907 * done any recovery; and again on any subsequent remount.
1908 */
1909 static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
1910 {
1911 struct ext4_sb_info *sbi = EXT4_SB(sb);
1912
1913 if (sbi->s_commit_interval)
1914 journal->j_commit_interval = sbi->s_commit_interval;
1915 /* We could also set up an ext4-specific default for the commit
1916 * interval here, but for now we'll just fall back to the jbd
1917 * default. */
1918
1919 spin_lock(&journal->j_state_lock);
1920 if (test_opt(sb, BARRIER))
1921 journal->j_flags |= JBD2_BARRIER;
1922 else
1923 journal->j_flags &= ~JBD2_BARRIER;
1924 spin_unlock(&journal->j_state_lock);
1925 }
1926
1927 static journal_t *ext4_get_journal(struct super_block *sb,
1928 unsigned int journal_inum)
1929 {
1930 struct inode *journal_inode;
1931 journal_t *journal;
1932
1933 /* First, test for the existence of a valid inode on disk. Bad
1934 * things happen if we iget() an unused inode, as the subsequent
1935 * iput() will try to delete it. */
1936
1937 journal_inode = iget(sb, journal_inum);
1938 if (!journal_inode) {
1939 printk(KERN_ERR "EXT4-fs: no journal found.\n");
1940 return NULL;
1941 }
1942 if (!journal_inode->i_nlink) {
1943 make_bad_inode(journal_inode);
1944 iput(journal_inode);
1945 printk(KERN_ERR "EXT4-fs: journal inode is deleted.\n");
1946 return NULL;
1947 }
1948
1949 jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
1950 journal_inode, journal_inode->i_size);
1951 if (is_bad_inode(journal_inode) || !S_ISREG(journal_inode->i_mode)) {
1952 printk(KERN_ERR "EXT4-fs: invalid journal inode.\n");
1953 iput(journal_inode);
1954 return NULL;
1955 }
1956
1957 journal = jbd2_journal_init_inode(journal_inode);
1958 if (!journal) {
1959 printk(KERN_ERR "EXT4-fs: Could not load journal inode\n");
1960 iput(journal_inode);
1961 return NULL;
1962 }
1963 journal->j_private = sb;
1964 ext4_init_journal_params(sb, journal);
1965 return journal;
1966 }
1967
1968 static journal_t *ext4_get_dev_journal(struct super_block *sb,
1969 dev_t j_dev)
1970 {
1971 struct buffer_head * bh;
1972 journal_t *journal;
1973 ext4_fsblk_t start;
1974 ext4_fsblk_t len;
1975 int hblock, blocksize;
1976 ext4_fsblk_t sb_block;
1977 unsigned long offset;
1978 struct ext4_super_block * es;
1979 struct block_device *bdev;
1980
1981 bdev = ext4_blkdev_get(j_dev);
1982 if (bdev == NULL)
1983 return NULL;
1984
1985 if (bd_claim(bdev, sb)) {
1986 printk(KERN_ERR
1987 "EXT4: failed to claim external journal device.\n");
1988 blkdev_put(bdev);
1989 return NULL;
1990 }
1991
1992 blocksize = sb->s_blocksize;
1993 hblock = bdev_hardsect_size(bdev);
1994 if (blocksize < hblock) {
1995 printk(KERN_ERR
1996 "EXT4-fs: blocksize too small for journal device.\n");
1997 goto out_bdev;
1998 }
1999
2000 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
2001 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
2002 set_blocksize(bdev, blocksize);
2003 if (!(bh = __bread(bdev, sb_block, blocksize))) {
2004 printk(KERN_ERR "EXT4-fs: couldn't read superblock of "
2005 "external journal\n");
2006 goto out_bdev;
2007 }
2008
2009 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
2010 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
2011 !(le32_to_cpu(es->s_feature_incompat) &
2012 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
2013 printk(KERN_ERR "EXT4-fs: external journal has "
2014 "bad superblock\n");
2015 brelse(bh);
2016 goto out_bdev;
2017 }
2018
2019 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
2020 printk(KERN_ERR "EXT4-fs: journal UUID does not match\n");
2021 brelse(bh);
2022 goto out_bdev;
2023 }
2024
2025 len = ext4_blocks_count(es);
2026 start = sb_block + 1;
2027 brelse(bh); /* we're done with the superblock */
2028
2029 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
2030 start, len, blocksize);
2031 if (!journal) {
2032 printk(KERN_ERR "EXT4-fs: failed to create device journal\n");
2033 goto out_bdev;
2034 }
2035 journal->j_private = sb;
2036 ll_rw_block(READ, 1, &journal->j_sb_buffer);
2037 wait_on_buffer(journal->j_sb_buffer);
2038 if (!buffer_uptodate(journal->j_sb_buffer)) {
2039 printk(KERN_ERR "EXT4-fs: I/O error on journal device\n");
2040 goto out_journal;
2041 }
2042 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
2043 printk(KERN_ERR "EXT4-fs: External journal has more than one "
2044 "user (unsupported) - %d\n",
2045 be32_to_cpu(journal->j_superblock->s_nr_users));
2046 goto out_journal;
2047 }
2048 EXT4_SB(sb)->journal_bdev = bdev;
2049 ext4_init_journal_params(sb, journal);
2050 return journal;
2051 out_journal:
2052 jbd2_journal_destroy(journal);
2053 out_bdev:
2054 ext4_blkdev_put(bdev);
2055 return NULL;
2056 }
2057
2058 static int ext4_load_journal(struct super_block *sb,
2059 struct ext4_super_block *es,
2060 unsigned long journal_devnum)
2061 {
2062 journal_t *journal;
2063 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
2064 dev_t journal_dev;
2065 int err = 0;
2066 int really_read_only;
2067
2068 if (journal_devnum &&
2069 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2070 printk(KERN_INFO "EXT4-fs: external journal device major/minor "
2071 "numbers have changed\n");
2072 journal_dev = new_decode_dev(journal_devnum);
2073 } else
2074 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
2075
2076 really_read_only = bdev_read_only(sb->s_bdev);
2077
2078 /*
2079 * Are we loading a blank journal or performing recovery after a
2080 * crash? For recovery, we need to check in advance whether we
2081 * can get read-write access to the device.
2082 */
2083
2084 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
2085 if (sb->s_flags & MS_RDONLY) {
2086 printk(KERN_INFO "EXT4-fs: INFO: recovery "
2087 "required on readonly filesystem.\n");
2088 if (really_read_only) {
2089 printk(KERN_ERR "EXT4-fs: write access "
2090 "unavailable, cannot proceed.\n");
2091 return -EROFS;
2092 }
2093 printk (KERN_INFO "EXT4-fs: write access will "
2094 "be enabled during recovery.\n");
2095 }
2096 }
2097
2098 if (journal_inum && journal_dev) {
2099 printk(KERN_ERR "EXT4-fs: filesystem has both journal "
2100 "and inode journals!\n");
2101 return -EINVAL;
2102 }
2103
2104 if (journal_inum) {
2105 if (!(journal = ext4_get_journal(sb, journal_inum)))
2106 return -EINVAL;
2107 } else {
2108 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
2109 return -EINVAL;
2110 }
2111
2112 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
2113 err = jbd2_journal_update_format(journal);
2114 if (err) {
2115 printk(KERN_ERR "EXT4-fs: error updating journal.\n");
2116 jbd2_journal_destroy(journal);
2117 return err;
2118 }
2119 }
2120
2121 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
2122 err = jbd2_journal_wipe(journal, !really_read_only);
2123 if (!err)
2124 err = jbd2_journal_load(journal);
2125
2126 if (err) {
2127 printk(KERN_ERR "EXT4-fs: error loading journal.\n");
2128 jbd2_journal_destroy(journal);
2129 return err;
2130 }
2131
2132 EXT4_SB(sb)->s_journal = journal;
2133 ext4_clear_journal_err(sb, es);
2134
2135 if (journal_devnum &&
2136 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2137 es->s_journal_dev = cpu_to_le32(journal_devnum);
2138 sb->s_dirt = 1;
2139
2140 /* Make sure we flush the recovery flag to disk. */
2141 ext4_commit_super(sb, es, 1);
2142 }
2143
2144 return 0;
2145 }
2146
2147 static int ext4_create_journal(struct super_block * sb,
2148 struct ext4_super_block * es,
2149 unsigned int journal_inum)
2150 {
2151 journal_t *journal;
2152
2153 if (sb->s_flags & MS_RDONLY) {
2154 printk(KERN_ERR "EXT4-fs: readonly filesystem when trying to "
2155 "create journal.\n");
2156 return -EROFS;
2157 }
2158
2159 if (!(journal = ext4_get_journal(sb, journal_inum)))
2160 return -EINVAL;
2161
2162 printk(KERN_INFO "EXT4-fs: creating new journal on inode %u\n",
2163 journal_inum);
2164
2165 if (jbd2_journal_create(journal)) {
2166 printk(KERN_ERR "EXT4-fs: error creating journal.\n");
2167 jbd2_journal_destroy(journal);
2168 return -EIO;
2169 }
2170
2171 EXT4_SB(sb)->s_journal = journal;
2172
2173 ext4_update_dynamic_rev(sb);
2174 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2175 EXT4_SET_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL);
2176
2177 es->s_journal_inum = cpu_to_le32(journal_inum);
2178 sb->s_dirt = 1;
2179
2180 /* Make sure we flush the recovery flag to disk. */
2181 ext4_commit_super(sb, es, 1);
2182
2183 return 0;
2184 }
2185
2186 static void ext4_commit_super (struct super_block * sb,
2187 struct ext4_super_block * es,
2188 int sync)
2189 {
2190 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
2191
2192 if (!sbh)
2193 return;
2194 es->s_wtime = cpu_to_le32(get_seconds());
2195 ext4_free_blocks_count_set(es, ext4_count_free_blocks(sb));
2196 es->s_free_inodes_count = cpu_to_le32(ext4_count_free_inodes(sb));
2197 BUFFER_TRACE(sbh, "marking dirty");
2198 mark_buffer_dirty(sbh);
2199 if (sync)
2200 sync_dirty_buffer(sbh);
2201 }
2202
2203
2204 /*
2205 * Have we just finished recovery? If so, and if we are mounting (or
2206 * remounting) the filesystem readonly, then we will end up with a
2207 * consistent fs on disk. Record that fact.
2208 */
2209 static void ext4_mark_recovery_complete(struct super_block * sb,
2210 struct ext4_super_block * es)
2211 {
2212 journal_t *journal = EXT4_SB(sb)->s_journal;
2213
2214 jbd2_journal_lock_updates(journal);
2215 jbd2_journal_flush(journal);
2216 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
2217 sb->s_flags & MS_RDONLY) {
2218 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2219 sb->s_dirt = 0;
2220 ext4_commit_super(sb, es, 1);
2221 }
2222 jbd2_journal_unlock_updates(journal);
2223 }
2224
2225 /*
2226 * If we are mounting (or read-write remounting) a filesystem whose journal
2227 * has recorded an error from a previous lifetime, move that error to the
2228 * main filesystem now.
2229 */
2230 static void ext4_clear_journal_err(struct super_block * sb,
2231 struct ext4_super_block * es)
2232 {
2233 journal_t *journal;
2234 int j_errno;
2235 const char *errstr;
2236
2237 journal = EXT4_SB(sb)->s_journal;
2238
2239 /*
2240 * Now check for any error status which may have been recorded in the
2241 * journal by a prior ext4_error() or ext4_abort()
2242 */
2243
2244 j_errno = jbd2_journal_errno(journal);
2245 if (j_errno) {
2246 char nbuf[16];
2247
2248 errstr = ext4_decode_error(sb, j_errno, nbuf);
2249 ext4_warning(sb, __FUNCTION__, "Filesystem error recorded "
2250 "from previous mount: %s", errstr);
2251 ext4_warning(sb, __FUNCTION__, "Marking fs in need of "
2252 "filesystem check.");
2253
2254 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
2255 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
2256 ext4_commit_super (sb, es, 1);
2257
2258 jbd2_journal_clear_err(journal);
2259 }
2260 }
2261
2262 /*
2263 * Force the running and committing transactions to commit,
2264 * and wait on the commit.
2265 */
2266 int ext4_force_commit(struct super_block *sb)
2267 {
2268 journal_t *journal;
2269 int ret;
2270
2271 if (sb->s_flags & MS_RDONLY)
2272 return 0;
2273
2274 journal = EXT4_SB(sb)->s_journal;
2275 sb->s_dirt = 0;
2276 ret = ext4_journal_force_commit(journal);
2277 return ret;
2278 }
2279
2280 /*
2281 * Ext4 always journals updates to the superblock itself, so we don't
2282 * have to propagate any other updates to the superblock on disk at this
2283 * point. Just start an async writeback to get the buffers on their way
2284 * to the disk.
2285 *
2286 * This implicitly triggers the writebehind on sync().
2287 */
2288
2289 static void ext4_write_super (struct super_block * sb)
2290 {
2291 if (mutex_trylock(&sb->s_lock) != 0)
2292 BUG();
2293 sb->s_dirt = 0;
2294 }
2295
2296 static int ext4_sync_fs(struct super_block *sb, int wait)
2297 {
2298 tid_t target;
2299
2300 sb->s_dirt = 0;
2301 if (jbd2_journal_start_commit(EXT4_SB(sb)->s_journal, &target)) {
2302 if (wait)
2303 jbd2_log_wait_commit(EXT4_SB(sb)->s_journal, target);
2304 }
2305 return 0;
2306 }
2307
2308 /*
2309 * LVM calls this function before a (read-only) snapshot is created. This
2310 * gives us a chance to flush the journal completely and mark the fs clean.
2311 */
2312 static void ext4_write_super_lockfs(struct super_block *sb)
2313 {
2314 sb->s_dirt = 0;
2315
2316 if (!(sb->s_flags & MS_RDONLY)) {
2317 journal_t *journal = EXT4_SB(sb)->s_journal;
2318
2319 /* Now we set up the journal barrier. */
2320 jbd2_journal_lock_updates(journal);
2321 jbd2_journal_flush(journal);
2322
2323 /* Journal blocked and flushed, clear needs_recovery flag. */
2324 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2325 ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1);
2326 }
2327 }
2328
2329 /*
2330 * Called by LVM after the snapshot is done. We need to reset the RECOVER
2331 * flag here, even though the filesystem is not technically dirty yet.
2332 */
2333 static void ext4_unlockfs(struct super_block *sb)
2334 {
2335 if (!(sb->s_flags & MS_RDONLY)) {
2336 lock_super(sb);
2337 /* Reser the needs_recovery flag before the fs is unlocked. */
2338 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2339 ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1);
2340 unlock_super(sb);
2341 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
2342 }
2343 }
2344
2345 static int ext4_remount (struct super_block * sb, int * flags, char * data)
2346 {
2347 struct ext4_super_block * es;
2348 struct ext4_sb_info *sbi = EXT4_SB(sb);
2349 ext4_fsblk_t n_blocks_count = 0;
2350 unsigned long old_sb_flags;
2351 struct ext4_mount_options old_opts;
2352 int err;
2353 #ifdef CONFIG_QUOTA
2354 int i;
2355 #endif
2356
2357 /* Store the original options */
2358 old_sb_flags = sb->s_flags;
2359 old_opts.s_mount_opt = sbi->s_mount_opt;
2360 old_opts.s_resuid = sbi->s_resuid;
2361 old_opts.s_resgid = sbi->s_resgid;
2362 old_opts.s_commit_interval = sbi->s_commit_interval;
2363 #ifdef CONFIG_QUOTA
2364 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
2365 for (i = 0; i < MAXQUOTAS; i++)
2366 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
2367 #endif
2368
2369 /*
2370 * Allow the "check" option to be passed as a remount option.
2371 */
2372 if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
2373 err = -EINVAL;
2374 goto restore_opts;
2375 }
2376
2377 if (sbi->s_mount_opt & EXT4_MOUNT_ABORT)
2378 ext4_abort(sb, __FUNCTION__, "Abort forced by user");
2379
2380 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
2381 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
2382
2383 es = sbi->s_es;
2384
2385 ext4_init_journal_params(sb, sbi->s_journal);
2386
2387 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
2388 n_blocks_count > ext4_blocks_count(es)) {
2389 if (sbi->s_mount_opt & EXT4_MOUNT_ABORT) {
2390 err = -EROFS;
2391 goto restore_opts;
2392 }
2393
2394 if (*flags & MS_RDONLY) {
2395 /*
2396 * First of all, the unconditional stuff we have to do
2397 * to disable replay of the journal when we next remount
2398 */
2399 sb->s_flags |= MS_RDONLY;
2400
2401 /*
2402 * OK, test if we are remounting a valid rw partition
2403 * readonly, and if so set the rdonly flag and then
2404 * mark the partition as valid again.
2405 */
2406 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
2407 (sbi->s_mount_state & EXT4_VALID_FS))
2408 es->s_state = cpu_to_le16(sbi->s_mount_state);
2409
2410 ext4_mark_recovery_complete(sb, es);
2411 } else {
2412 __le32 ret;
2413 if ((ret = EXT4_HAS_RO_COMPAT_FEATURE(sb,
2414 ~EXT4_FEATURE_RO_COMPAT_SUPP))) {
2415 printk(KERN_WARNING "EXT4-fs: %s: couldn't "
2416 "remount RDWR because of unsupported "
2417 "optional features (%x).\n",
2418 sb->s_id, le32_to_cpu(ret));
2419 err = -EROFS;
2420 goto restore_opts;
2421 }
2422 /*
2423 * Mounting a RDONLY partition read-write, so reread
2424 * and store the current valid flag. (It may have
2425 * been changed by e2fsck since we originally mounted
2426 * the partition.)
2427 */
2428 ext4_clear_journal_err(sb, es);
2429 sbi->s_mount_state = le16_to_cpu(es->s_state);
2430 if ((err = ext4_group_extend(sb, es, n_blocks_count)))
2431 goto restore_opts;
2432 if (!ext4_setup_super (sb, es, 0))
2433 sb->s_flags &= ~MS_RDONLY;
2434 }
2435 }
2436 #ifdef CONFIG_QUOTA
2437 /* Release old quota file names */
2438 for (i = 0; i < MAXQUOTAS; i++)
2439 if (old_opts.s_qf_names[i] &&
2440 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2441 kfree(old_opts.s_qf_names[i]);
2442 #endif
2443 return 0;
2444 restore_opts:
2445 sb->s_flags = old_sb_flags;
2446 sbi->s_mount_opt = old_opts.s_mount_opt;
2447 sbi->s_resuid = old_opts.s_resuid;
2448 sbi->s_resgid = old_opts.s_resgid;
2449 sbi->s_commit_interval = old_opts.s_commit_interval;
2450 #ifdef CONFIG_QUOTA
2451 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
2452 for (i = 0; i < MAXQUOTAS; i++) {
2453 if (sbi->s_qf_names[i] &&
2454 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2455 kfree(sbi->s_qf_names[i]);
2456 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
2457 }
2458 #endif
2459 return err;
2460 }
2461
2462 static int ext4_statfs (struct dentry * dentry, struct kstatfs * buf)
2463 {
2464 struct super_block *sb = dentry->d_sb;
2465 struct ext4_sb_info *sbi = EXT4_SB(sb);
2466 struct ext4_super_block *es = sbi->s_es;
2467 ext4_fsblk_t overhead;
2468 int i;
2469 u64 fsid;
2470
2471 if (test_opt (sb, MINIX_DF))
2472 overhead = 0;
2473 else {
2474 unsigned long ngroups;
2475 ngroups = EXT4_SB(sb)->s_groups_count;
2476 smp_rmb();
2477
2478 /*
2479 * Compute the overhead (FS structures)
2480 */
2481
2482 /*
2483 * All of the blocks before first_data_block are
2484 * overhead
2485 */
2486 overhead = le32_to_cpu(es->s_first_data_block);
2487
2488 /*
2489 * Add the overhead attributed to the superblock and
2490 * block group descriptors. If the sparse superblocks
2491 * feature is turned on, then not all groups have this.
2492 */
2493 for (i = 0; i < ngroups; i++) {
2494 overhead += ext4_bg_has_super(sb, i) +
2495 ext4_bg_num_gdb(sb, i);
2496 cond_resched();
2497 }
2498
2499 /*
2500 * Every block group has an inode bitmap, a block
2501 * bitmap, and an inode table.
2502 */
2503 overhead += (ngroups * (2 + EXT4_SB(sb)->s_itb_per_group));
2504 }
2505
2506 buf->f_type = EXT4_SUPER_MAGIC;
2507 buf->f_bsize = sb->s_blocksize;
2508 buf->f_blocks = ext4_blocks_count(es) - overhead;
2509 buf->f_bfree = percpu_counter_sum(&sbi->s_freeblocks_counter);
2510 buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es);
2511 if (buf->f_bfree < ext4_r_blocks_count(es))
2512 buf->f_bavail = 0;
2513 buf->f_files = le32_to_cpu(es->s_inodes_count);
2514 buf->f_ffree = percpu_counter_sum(&sbi->s_freeinodes_counter);
2515 buf->f_namelen = EXT4_NAME_LEN;
2516 fsid = le64_to_cpup((void *)es->s_uuid) ^
2517 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
2518 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
2519 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
2520 return 0;
2521 }
2522
2523 /* Helper function for writing quotas on sync - we need to start transaction before quota file
2524 * is locked for write. Otherwise the are possible deadlocks:
2525 * Process 1 Process 2
2526 * ext4_create() quota_sync()
2527 * jbd2_journal_start() write_dquot()
2528 * DQUOT_INIT() down(dqio_mutex)
2529 * down(dqio_mutex) jbd2_journal_start()
2530 *
2531 */
2532
2533 #ifdef CONFIG_QUOTA
2534
2535 static inline struct inode *dquot_to_inode(struct dquot *dquot)
2536 {
2537 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
2538 }
2539
2540 static int ext4_dquot_initialize(struct inode *inode, int type)
2541 {
2542 handle_t *handle;
2543 int ret, err;
2544
2545 /* We may create quota structure so we need to reserve enough blocks */
2546 handle = ext4_journal_start(inode, 2*EXT4_QUOTA_INIT_BLOCKS(inode->i_sb));
2547 if (IS_ERR(handle))
2548 return PTR_ERR(handle);
2549 ret = dquot_initialize(inode, type);
2550 err = ext4_journal_stop(handle);
2551 if (!ret)
2552 ret = err;
2553 return ret;
2554 }
2555
2556 static int ext4_dquot_drop(struct inode *inode)
2557 {
2558 handle_t *handle;
2559 int ret, err;
2560
2561 /* We may delete quota structure so we need to reserve enough blocks */
2562 handle = ext4_journal_start(inode, 2*EXT4_QUOTA_DEL_BLOCKS(inode->i_sb));
2563 if (IS_ERR(handle))
2564 return PTR_ERR(handle);
2565 ret = dquot_drop(inode);
2566 err = ext4_journal_stop(handle);
2567 if (!ret)
2568 ret = err;
2569 return ret;
2570 }
2571
2572 static int ext4_write_dquot(struct dquot *dquot)
2573 {
2574 int ret, err;
2575 handle_t *handle;
2576 struct inode *inode;
2577
2578 inode = dquot_to_inode(dquot);
2579 handle = ext4_journal_start(inode,
2580 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2581 if (IS_ERR(handle))
2582 return PTR_ERR(handle);
2583 ret = dquot_commit(dquot);
2584 err = ext4_journal_stop(handle);
2585 if (!ret)
2586 ret = err;
2587 return ret;
2588 }
2589
2590 static int ext4_acquire_dquot(struct dquot *dquot)
2591 {
2592 int ret, err;
2593 handle_t *handle;
2594
2595 handle = ext4_journal_start(dquot_to_inode(dquot),
2596 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2597 if (IS_ERR(handle))
2598 return PTR_ERR(handle);
2599 ret = dquot_acquire(dquot);
2600 err = ext4_journal_stop(handle);
2601 if (!ret)
2602 ret = err;
2603 return ret;
2604 }
2605
2606 static int ext4_release_dquot(struct dquot *dquot)
2607 {
2608 int ret, err;
2609 handle_t *handle;
2610
2611 handle = ext4_journal_start(dquot_to_inode(dquot),
2612 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2613 if (IS_ERR(handle))
2614 return PTR_ERR(handle);
2615 ret = dquot_release(dquot);
2616 err = ext4_journal_stop(handle);
2617 if (!ret)
2618 ret = err;
2619 return ret;
2620 }
2621
2622 static int ext4_mark_dquot_dirty(struct dquot *dquot)
2623 {
2624 /* Are we journalling quotas? */
2625 if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2626 EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2627 dquot_mark_dquot_dirty(dquot);
2628 return ext4_write_dquot(dquot);
2629 } else {
2630 return dquot_mark_dquot_dirty(dquot);
2631 }
2632 }
2633
2634 static int ext4_write_info(struct super_block *sb, int type)
2635 {
2636 int ret, err;
2637 handle_t *handle;
2638
2639 /* Data block + inode block */
2640 handle = ext4_journal_start(sb->s_root->d_inode, 2);
2641 if (IS_ERR(handle))
2642 return PTR_ERR(handle);
2643 ret = dquot_commit_info(sb, type);
2644 err = ext4_journal_stop(handle);
2645 if (!ret)
2646 ret = err;
2647 return ret;
2648 }
2649
2650 /*
2651 * Turn on quotas during mount time - we need to find
2652 * the quota file and such...
2653 */
2654 static int ext4_quota_on_mount(struct super_block *sb, int type)
2655 {
2656 return vfs_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
2657 EXT4_SB(sb)->s_jquota_fmt, type);
2658 }
2659
2660 /*
2661 * Standard function to be called on quota_on
2662 */
2663 static int ext4_quota_on(struct super_block *sb, int type, int format_id,
2664 char *path)
2665 {
2666 int err;
2667 struct nameidata nd;
2668
2669 if (!test_opt(sb, QUOTA))
2670 return -EINVAL;
2671 /* Not journalling quota? */
2672 if (!EXT4_SB(sb)->s_qf_names[USRQUOTA] &&
2673 !EXT4_SB(sb)->s_qf_names[GRPQUOTA])
2674 return vfs_quota_on(sb, type, format_id, path);
2675 err = path_lookup(path, LOOKUP_FOLLOW, &nd);
2676 if (err)
2677 return err;
2678 /* Quotafile not on the same filesystem? */
2679 if (nd.mnt->mnt_sb != sb) {
2680 path_release(&nd);
2681 return -EXDEV;
2682 }
2683 /* Quotafile not of fs root? */
2684 if (nd.dentry->d_parent->d_inode != sb->s_root->d_inode)
2685 printk(KERN_WARNING
2686 "EXT4-fs: Quota file not on filesystem root. "
2687 "Journalled quota will not work.\n");
2688 path_release(&nd);
2689 return vfs_quota_on(sb, type, format_id, path);
2690 }
2691
2692 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2693 * acquiring the locks... As quota files are never truncated and quota code
2694 * itself serializes the operations (and noone else should touch the files)
2695 * we don't have to be afraid of races */
2696 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
2697 size_t len, loff_t off)
2698 {
2699 struct inode *inode = sb_dqopt(sb)->files[type];
2700 sector_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
2701 int err = 0;
2702 int offset = off & (sb->s_blocksize - 1);
2703 int tocopy;
2704 size_t toread;
2705 struct buffer_head *bh;
2706 loff_t i_size = i_size_read(inode);
2707
2708 if (off > i_size)
2709 return 0;
2710 if (off+len > i_size)
2711 len = i_size-off;
2712 toread = len;
2713 while (toread > 0) {
2714 tocopy = sb->s_blocksize - offset < toread ?
2715 sb->s_blocksize - offset : toread;
2716 bh = ext4_bread(NULL, inode, blk, 0, &err);
2717 if (err)
2718 return err;
2719 if (!bh) /* A hole? */
2720 memset(data, 0, tocopy);
2721 else
2722 memcpy(data, bh->b_data+offset, tocopy);
2723 brelse(bh);
2724 offset = 0;
2725 toread -= tocopy;
2726 data += tocopy;
2727 blk++;
2728 }
2729 return len;
2730 }
2731
2732 /* Write to quotafile (we know the transaction is already started and has
2733 * enough credits) */
2734 static ssize_t ext4_quota_write(struct super_block *sb, int type,
2735 const char *data, size_t len, loff_t off)
2736 {
2737 struct inode *inode = sb_dqopt(sb)->files[type];
2738 sector_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
2739 int err = 0;
2740 int offset = off & (sb->s_blocksize - 1);
2741 int tocopy;
2742 int journal_quota = EXT4_SB(sb)->s_qf_names[type] != NULL;
2743 size_t towrite = len;
2744 struct buffer_head *bh;
2745 handle_t *handle = journal_current_handle();
2746
2747 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
2748 while (towrite > 0) {
2749 tocopy = sb->s_blocksize - offset < towrite ?
2750 sb->s_blocksize - offset : towrite;
2751 bh = ext4_bread(handle, inode, blk, 1, &err);
2752 if (!bh)
2753 goto out;
2754 if (journal_quota) {
2755 err = ext4_journal_get_write_access(handle, bh);
2756 if (err) {
2757 brelse(bh);
2758 goto out;
2759 }
2760 }
2761 lock_buffer(bh);
2762 memcpy(bh->b_data+offset, data, tocopy);
2763 flush_dcache_page(bh->b_page);
2764 unlock_buffer(bh);
2765 if (journal_quota)
2766 err = ext4_journal_dirty_metadata(handle, bh);
2767 else {
2768 /* Always do at least ordered writes for quotas */
2769 err = ext4_journal_dirty_data(handle, bh);
2770 mark_buffer_dirty(bh);
2771 }
2772 brelse(bh);
2773 if (err)
2774 goto out;
2775 offset = 0;
2776 towrite -= tocopy;
2777 data += tocopy;
2778 blk++;
2779 }
2780 out:
2781 if (len == towrite)
2782 return err;
2783 if (inode->i_size < off+len-towrite) {
2784 i_size_write(inode, off+len-towrite);
2785 EXT4_I(inode)->i_disksize = inode->i_size;
2786 }
2787 inode->i_version++;
2788 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2789 ext4_mark_inode_dirty(handle, inode);
2790 mutex_unlock(&inode->i_mutex);
2791 return len - towrite;
2792 }
2793
2794 #endif
2795
2796 static int ext4_get_sb(struct file_system_type *fs_type,
2797 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
2798 {
2799 return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super, mnt);
2800 }
2801
2802 static struct file_system_type ext4dev_fs_type = {
2803 .owner = THIS_MODULE,
2804 .name = "ext4dev",
2805 .get_sb = ext4_get_sb,
2806 .kill_sb = kill_block_super,
2807 .fs_flags = FS_REQUIRES_DEV,
2808 };
2809
2810 static int __init init_ext4_fs(void)
2811 {
2812 int err = init_ext4_xattr();
2813 if (err)
2814 return err;
2815 err = init_inodecache();
2816 if (err)
2817 goto out1;
2818 err = register_filesystem(&ext4dev_fs_type);
2819 if (err)
2820 goto out;
2821 return 0;
2822 out:
2823 destroy_inodecache();
2824 out1:
2825 exit_ext4_xattr();
2826 return err;
2827 }
2828
2829 static void __exit exit_ext4_fs(void)
2830 {
2831 unregister_filesystem(&ext4dev_fs_type);
2832 destroy_inodecache();
2833 exit_ext4_xattr();
2834 }
2835
2836 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
2837 MODULE_DESCRIPTION("Fourth Extended Filesystem with extents");
2838 MODULE_LICENSE("GPL");
2839 module_init(init_ext4_fs)
2840 module_exit(exit_ext4_fs)
Stable & featurefull patchset based on Linus's git branch