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x86: jprobe bugfix
[linux-2.6/mini2440.git] / fs / ext4 / super.c
blob1ca0f546c466193e46c519879e8329a18c1b1af1
1 /*
2 * linux/fs/ext4/super.c
3 *
4 * Copyright (C) 1992, 1993, 1994, 1995
5 * Remy Card (card@masi.ibp.fr)
6 * Laboratoire MASI - Institut Blaise Pascal
7 * Universite Pierre et Marie Curie (Paris VI)
8 *
9 * from
10 *
11 * linux/fs/minix/inode.c
12 *
13 * Copyright (C) 1991, 1992 Linus Torvalds
14 *
15 * Big-endian to little-endian byte-swapping/bitmaps by
16 * David S. Miller (davem@caip.rutgers.edu), 1995
17 */
18
19 #include <linux/module.h>
20 #include <linux/string.h>
21 #include <linux/fs.h>
22 #include <linux/time.h>
23 #include <linux/jbd2.h>
24 #include <linux/ext4_fs.h>
25 #include <linux/ext4_jbd2.h>
26 #include <linux/slab.h>
27 #include <linux/init.h>
28 #include <linux/blkdev.h>
29 #include <linux/parser.h>
30 #include <linux/smp_lock.h>
31 #include <linux/buffer_head.h>
32 #include <linux/exportfs.h>
33 #include <linux/vfs.h>
34 #include <linux/random.h>
35 #include <linux/mount.h>
36 #include <linux/namei.h>
37 #include <linux/quotaops.h>
38 #include <linux/seq_file.h>
39 #include <linux/log2.h>
40 #include <linux/crc16.h>
41
42 #include <asm/uaccess.h>
43
44 #include "xattr.h"
45 #include "acl.h"
46 #include "namei.h"
47 #include "group.h"
48
49 static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
50 unsigned long journal_devnum);
51 static int ext4_create_journal(struct super_block *, struct ext4_super_block *,
52 unsigned int);
53 static void ext4_commit_super (struct super_block * sb,
54 struct ext4_super_block * es,
55 int sync);
56 static void ext4_mark_recovery_complete(struct super_block * sb,
57 struct ext4_super_block * es);
58 static void ext4_clear_journal_err(struct super_block * sb,
59 struct ext4_super_block * es);
60 static int ext4_sync_fs(struct super_block *sb, int wait);
61 static const char *ext4_decode_error(struct super_block * sb, int errno,
62 char nbuf[16]);
63 static int ext4_remount (struct super_block * sb, int * flags, char * data);
64 static int ext4_statfs (struct dentry * dentry, struct kstatfs * buf);
65 static void ext4_unlockfs(struct super_block *sb);
66 static void ext4_write_super (struct super_block * sb);
67 static void ext4_write_super_lockfs(struct super_block *sb);
68
69
70 ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
71 struct ext4_group_desc *bg)
72 {
73 return le32_to_cpu(bg->bg_block_bitmap_lo) |
74 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
75 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
76 }
77
78 ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
79 struct ext4_group_desc *bg)
80 {
81 return le32_to_cpu(bg->bg_inode_bitmap_lo) |
82 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
83 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
84 }
85
86 ext4_fsblk_t ext4_inode_table(struct super_block *sb,
87 struct ext4_group_desc *bg)
88 {
89 return le32_to_cpu(bg->bg_inode_table_lo) |
90 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
91 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
92 }
93
94 void ext4_block_bitmap_set(struct super_block *sb,
95 struct ext4_group_desc *bg, ext4_fsblk_t blk)
96 {
97 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
98 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
99 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
100 }
101
102 void ext4_inode_bitmap_set(struct super_block *sb,
103 struct ext4_group_desc *bg, ext4_fsblk_t blk)
104 {
105 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk);
106 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
107 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
108 }
109
110 void ext4_inode_table_set(struct super_block *sb,
111 struct ext4_group_desc *bg, ext4_fsblk_t blk)
112 {
113 bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
114 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
115 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
116 }
117
118 /*
119 * Wrappers for jbd2_journal_start/end.
120 *
121 * The only special thing we need to do here is to make sure that all
122 * journal_end calls result in the superblock being marked dirty, so
123 * that sync() will call the filesystem's write_super callback if
124 * appropriate.
125 */
126 handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks)
127 {
128 journal_t *journal;
129
130 if (sb->s_flags & MS_RDONLY)
131 return ERR_PTR(-EROFS);
132
133 /* Special case here: if the journal has aborted behind our
134 * backs (eg. EIO in the commit thread), then we still need to
135 * take the FS itself readonly cleanly. */
136 journal = EXT4_SB(sb)->s_journal;
137 if (is_journal_aborted(journal)) {
138 ext4_abort(sb, __FUNCTION__,
139 "Detected aborted journal");
140 return ERR_PTR(-EROFS);
141 }
142
143 return jbd2_journal_start(journal, nblocks);
144 }
145
146 /*
147 * The only special thing we need to do here is to make sure that all
148 * jbd2_journal_stop calls result in the superblock being marked dirty, so
149 * that sync() will call the filesystem's write_super callback if
150 * appropriate.
151 */
152 int __ext4_journal_stop(const char *where, handle_t *handle)
153 {
154 struct super_block *sb;
155 int err;
156 int rc;
157
158 sb = handle->h_transaction->t_journal->j_private;
159 err = handle->h_err;
160 rc = jbd2_journal_stop(handle);
161
162 if (!err)
163 err = rc;
164 if (err)
165 __ext4_std_error(sb, where, err);
166 return err;
167 }
168
169 void ext4_journal_abort_handle(const char *caller, const char *err_fn,
170 struct buffer_head *bh, handle_t *handle, int err)
171 {
172 char nbuf[16];
173 const char *errstr = ext4_decode_error(NULL, err, nbuf);
174
175 if (bh)
176 BUFFER_TRACE(bh, "abort");
177
178 if (!handle->h_err)
179 handle->h_err = err;
180
181 if (is_handle_aborted(handle))
182 return;
183
184 printk(KERN_ERR "%s: aborting transaction: %s in %s\n",
185 caller, errstr, err_fn);
186
187 jbd2_journal_abort_handle(handle);
188 }
189
190 /* Deal with the reporting of failure conditions on a filesystem such as
191 * inconsistencies detected or read IO failures.
192 *
193 * On ext2, we can store the error state of the filesystem in the
194 * superblock. That is not possible on ext4, because we may have other
195 * write ordering constraints on the superblock which prevent us from
196 * writing it out straight away; and given that the journal is about to
197 * be aborted, we can't rely on the current, or future, transactions to
198 * write out the superblock safely.
199 *
200 * We'll just use the jbd2_journal_abort() error code to record an error in
201 * the journal instead. On recovery, the journal will compain about
202 * that error until we've noted it down and cleared it.
203 */
204
205 static void ext4_handle_error(struct super_block *sb)
206 {
207 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
208
209 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
210 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
211
212 if (sb->s_flags & MS_RDONLY)
213 return;
214
215 if (!test_opt (sb, ERRORS_CONT)) {
216 journal_t *journal = EXT4_SB(sb)->s_journal;
217
218 EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT;
219 if (journal)
220 jbd2_journal_abort(journal, -EIO);
221 }
222 if (test_opt (sb, ERRORS_RO)) {
223 printk (KERN_CRIT "Remounting filesystem read-only\n");
224 sb->s_flags |= MS_RDONLY;
225 }
226 ext4_commit_super(sb, es, 1);
227 if (test_opt(sb, ERRORS_PANIC))
228 panic("EXT4-fs (device %s): panic forced after error\n",
229 sb->s_id);
230 }
231
232 void ext4_error (struct super_block * sb, const char * function,
233 const char * fmt, ...)
234 {
235 va_list args;
236
237 va_start(args, fmt);
238 printk(KERN_CRIT "EXT4-fs error (device %s): %s: ",sb->s_id, function);
239 vprintk(fmt, args);
240 printk("\n");
241 va_end(args);
242
243 ext4_handle_error(sb);
244 }
245
246 static const char *ext4_decode_error(struct super_block * sb, int errno,
247 char nbuf[16])
248 {
249 char *errstr = NULL;
250
251 switch (errno) {
252 case -EIO:
253 errstr = "IO failure";
254 break;
255 case -ENOMEM:
256 errstr = "Out of memory";
257 break;
258 case -EROFS:
259 if (!sb || EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT)
260 errstr = "Journal has aborted";
261 else
262 errstr = "Readonly filesystem";
263 break;
264 default:
265 /* If the caller passed in an extra buffer for unknown
266 * errors, textualise them now. Else we just return
267 * NULL. */
268 if (nbuf) {
269 /* Check for truncated error codes... */
270 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
271 errstr = nbuf;
272 }
273 break;
274 }
275
276 return errstr;
277 }
278
279 /* __ext4_std_error decodes expected errors from journaling functions
280 * automatically and invokes the appropriate error response. */
281
282 void __ext4_std_error (struct super_block * sb, const char * function,
283 int errno)
284 {
285 char nbuf[16];
286 const char *errstr;
287
288 /* Special case: if the error is EROFS, and we're not already
289 * inside a transaction, then there's really no point in logging
290 * an error. */
291 if (errno == -EROFS && journal_current_handle() == NULL &&
292 (sb->s_flags & MS_RDONLY))
293 return;
294
295 errstr = ext4_decode_error(sb, errno, nbuf);
296 printk (KERN_CRIT "EXT4-fs error (device %s) in %s: %s\n",
297 sb->s_id, function, errstr);
298
299 ext4_handle_error(sb);
300 }
301
302 /*
303 * ext4_abort is a much stronger failure handler than ext4_error. The
304 * abort function may be used to deal with unrecoverable failures such
305 * as journal IO errors or ENOMEM at a critical moment in log management.
306 *
307 * We unconditionally force the filesystem into an ABORT|READONLY state,
308 * unless the error response on the fs has been set to panic in which
309 * case we take the easy way out and panic immediately.
310 */
311
312 void ext4_abort (struct super_block * sb, const char * function,
313 const char * fmt, ...)
314 {
315 va_list args;
316
317 printk (KERN_CRIT "ext4_abort called.\n");
318
319 va_start(args, fmt);
320 printk(KERN_CRIT "EXT4-fs error (device %s): %s: ",sb->s_id, function);
321 vprintk(fmt, args);
322 printk("\n");
323 va_end(args);
324
325 if (test_opt(sb, ERRORS_PANIC))
326 panic("EXT4-fs panic from previous error\n");
327
328 if (sb->s_flags & MS_RDONLY)
329 return;
330
331 printk(KERN_CRIT "Remounting filesystem read-only\n");
332 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
333 sb->s_flags |= MS_RDONLY;
334 EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT;
335 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
336 }
337
338 void ext4_warning (struct super_block * sb, const char * function,
339 const char * fmt, ...)
340 {
341 va_list args;
342
343 va_start(args, fmt);
344 printk(KERN_WARNING "EXT4-fs warning (device %s): %s: ",
345 sb->s_id, function);
346 vprintk(fmt, args);
347 printk("\n");
348 va_end(args);
349 }
350
351 void ext4_update_dynamic_rev(struct super_block *sb)
352 {
353 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
354
355 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
356 return;
357
358 ext4_warning(sb, __FUNCTION__,
359 "updating to rev %d because of new feature flag, "
360 "running e2fsck is recommended",
361 EXT4_DYNAMIC_REV);
362
363 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
364 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
365 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
366 /* leave es->s_feature_*compat flags alone */
367 /* es->s_uuid will be set by e2fsck if empty */
368
369 /*
370 * The rest of the superblock fields should be zero, and if not it
371 * means they are likely already in use, so leave them alone. We
372 * can leave it up to e2fsck to clean up any inconsistencies there.
373 */
374 }
375
376 /*
377 * Open the external journal device
378 */
379 static struct block_device *ext4_blkdev_get(dev_t dev)
380 {
381 struct block_device *bdev;
382 char b[BDEVNAME_SIZE];
383
384 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
385 if (IS_ERR(bdev))
386 goto fail;
387 return bdev;
388
389 fail:
390 printk(KERN_ERR "EXT4: failed to open journal device %s: %ld\n",
391 __bdevname(dev, b), PTR_ERR(bdev));
392 return NULL;
393 }
394
395 /*
396 * Release the journal device
397 */
398 static int ext4_blkdev_put(struct block_device *bdev)
399 {
400 bd_release(bdev);
401 return blkdev_put(bdev);
402 }
403
404 static int ext4_blkdev_remove(struct ext4_sb_info *sbi)
405 {
406 struct block_device *bdev;
407 int ret = -ENODEV;
408
409 bdev = sbi->journal_bdev;
410 if (bdev) {
411 ret = ext4_blkdev_put(bdev);
412 sbi->journal_bdev = NULL;
413 }
414 return ret;
415 }
416
417 static inline struct inode *orphan_list_entry(struct list_head *l)
418 {
419 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
420 }
421
422 static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
423 {
424 struct list_head *l;
425
426 printk(KERN_ERR "sb orphan head is %d\n",
427 le32_to_cpu(sbi->s_es->s_last_orphan));
428
429 printk(KERN_ERR "sb_info orphan list:\n");
430 list_for_each(l, &sbi->s_orphan) {
431 struct inode *inode = orphan_list_entry(l);
432 printk(KERN_ERR " "
433 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
434 inode->i_sb->s_id, inode->i_ino, inode,
435 inode->i_mode, inode->i_nlink,
436 NEXT_ORPHAN(inode));
437 }
438 }
439
440 static void ext4_put_super (struct super_block * sb)
441 {
442 struct ext4_sb_info *sbi = EXT4_SB(sb);
443 struct ext4_super_block *es = sbi->s_es;
444 int i;
445
446 ext4_ext_release(sb);
447 ext4_xattr_put_super(sb);
448 jbd2_journal_destroy(sbi->s_journal);
449 if (!(sb->s_flags & MS_RDONLY)) {
450 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
451 es->s_state = cpu_to_le16(sbi->s_mount_state);
452 BUFFER_TRACE(sbi->s_sbh, "marking dirty");
453 mark_buffer_dirty(sbi->s_sbh);
454 ext4_commit_super(sb, es, 1);
455 }
456
457 for (i = 0; i < sbi->s_gdb_count; i++)
458 brelse(sbi->s_group_desc[i]);
459 kfree(sbi->s_group_desc);
460 percpu_counter_destroy(&sbi->s_freeblocks_counter);
461 percpu_counter_destroy(&sbi->s_freeinodes_counter);
462 percpu_counter_destroy(&sbi->s_dirs_counter);
463 brelse(sbi->s_sbh);
464 #ifdef CONFIG_QUOTA
465 for (i = 0; i < MAXQUOTAS; i++)
466 kfree(sbi->s_qf_names[i]);
467 #endif
468
469 /* Debugging code just in case the in-memory inode orphan list
470 * isn't empty. The on-disk one can be non-empty if we've
471 * detected an error and taken the fs readonly, but the
472 * in-memory list had better be clean by this point. */
473 if (!list_empty(&sbi->s_orphan))
474 dump_orphan_list(sb, sbi);
475 J_ASSERT(list_empty(&sbi->s_orphan));
476
477 invalidate_bdev(sb->s_bdev);
478 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
479 /*
480 * Invalidate the journal device's buffers. We don't want them
481 * floating about in memory - the physical journal device may
482 * hotswapped, and it breaks the `ro-after' testing code.
483 */
484 sync_blockdev(sbi->journal_bdev);
485 invalidate_bdev(sbi->journal_bdev);
486 ext4_blkdev_remove(sbi);
487 }
488 sb->s_fs_info = NULL;
489 kfree(sbi);
490 return;
491 }
492
493 static struct kmem_cache *ext4_inode_cachep;
494
495 /*
496 * Called inside transaction, so use GFP_NOFS
497 */
498 static struct inode *ext4_alloc_inode(struct super_block *sb)
499 {
500 struct ext4_inode_info *ei;
501
502 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
503 if (!ei)
504 return NULL;
505 #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
506 ei->i_acl = EXT4_ACL_NOT_CACHED;
507 ei->i_default_acl = EXT4_ACL_NOT_CACHED;
508 #endif
509 ei->i_block_alloc_info = NULL;
510 ei->vfs_inode.i_version = 1;
511 memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache));
512 return &ei->vfs_inode;
513 }
514
515 static void ext4_destroy_inode(struct inode *inode)
516 {
517 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
518 printk("EXT4 Inode %p: orphan list check failed!\n",
519 EXT4_I(inode));
520 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
521 EXT4_I(inode), sizeof(struct ext4_inode_info),
522 true);
523 dump_stack();
524 }
525 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
526 }
527
528 static void init_once(struct kmem_cache *cachep, void *foo)
529 {
530 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
531
532 INIT_LIST_HEAD(&ei->i_orphan);
533 #ifdef CONFIG_EXT4DEV_FS_XATTR
534 init_rwsem(&ei->xattr_sem);
535 #endif
536 mutex_init(&ei->truncate_mutex);
537 inode_init_once(&ei->vfs_inode);
538 }
539
540 static int init_inodecache(void)
541 {
542 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
543 sizeof(struct ext4_inode_info),
544 0, (SLAB_RECLAIM_ACCOUNT|
545 SLAB_MEM_SPREAD),
546 init_once);
547 if (ext4_inode_cachep == NULL)
548 return -ENOMEM;
549 return 0;
550 }
551
552 static void destroy_inodecache(void)
553 {
554 kmem_cache_destroy(ext4_inode_cachep);
555 }
556
557 static void ext4_clear_inode(struct inode *inode)
558 {
559 struct ext4_block_alloc_info *rsv = EXT4_I(inode)->i_block_alloc_info;
560 #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
561 if (EXT4_I(inode)->i_acl &&
562 EXT4_I(inode)->i_acl != EXT4_ACL_NOT_CACHED) {
563 posix_acl_release(EXT4_I(inode)->i_acl);
564 EXT4_I(inode)->i_acl = EXT4_ACL_NOT_CACHED;
565 }
566 if (EXT4_I(inode)->i_default_acl &&
567 EXT4_I(inode)->i_default_acl != EXT4_ACL_NOT_CACHED) {
568 posix_acl_release(EXT4_I(inode)->i_default_acl);
569 EXT4_I(inode)->i_default_acl = EXT4_ACL_NOT_CACHED;
570 }
571 #endif
572 ext4_discard_reservation(inode);
573 EXT4_I(inode)->i_block_alloc_info = NULL;
574 if (unlikely(rsv))
575 kfree(rsv);
576 }
577
578 static inline void ext4_show_quota_options(struct seq_file *seq, struct super_block *sb)
579 {
580 #if defined(CONFIG_QUOTA)
581 struct ext4_sb_info *sbi = EXT4_SB(sb);
582
583 if (sbi->s_jquota_fmt)
584 seq_printf(seq, ",jqfmt=%s",
585 (sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold": "vfsv0");
586
587 if (sbi->s_qf_names[USRQUOTA])
588 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
589
590 if (sbi->s_qf_names[GRPQUOTA])
591 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
592
593 if (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA)
594 seq_puts(seq, ",usrquota");
595
596 if (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)
597 seq_puts(seq, ",grpquota");
598 #endif
599 }
600
601 /*
602 * Show an option if
603 * - it's set to a non-default value OR
604 * - if the per-sb default is different from the global default
605 */
606 static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs)
607 {
608 struct super_block *sb = vfs->mnt_sb;
609 struct ext4_sb_info *sbi = EXT4_SB(sb);
610 struct ext4_super_block *es = sbi->s_es;
611 unsigned long def_mount_opts;
612
613 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
614
615 if (sbi->s_sb_block != 1)
616 seq_printf(seq, ",sb=%llu", sbi->s_sb_block);
617 if (test_opt(sb, MINIX_DF))
618 seq_puts(seq, ",minixdf");
619 if (test_opt(sb, GRPID))
620 seq_puts(seq, ",grpid");
621 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT4_DEFM_BSDGROUPS))
622 seq_puts(seq, ",nogrpid");
623 if (sbi->s_resuid != EXT4_DEF_RESUID ||
624 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID) {
625 seq_printf(seq, ",resuid=%u", sbi->s_resuid);
626 }
627 if (sbi->s_resgid != EXT4_DEF_RESGID ||
628 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID) {
629 seq_printf(seq, ",resgid=%u", sbi->s_resgid);
630 }
631 if (test_opt(sb, ERRORS_CONT)) {
632 int def_errors = le16_to_cpu(es->s_errors);
633
634 if (def_errors == EXT4_ERRORS_PANIC ||
635 def_errors == EXT4_ERRORS_RO) {
636 seq_puts(seq, ",errors=continue");
637 }
638 }
639 if (test_opt(sb, ERRORS_RO))
640 seq_puts(seq, ",errors=remount-ro");
641 if (test_opt(sb, ERRORS_PANIC))
642 seq_puts(seq, ",errors=panic");
643 if (test_opt(sb, NO_UID32))
644 seq_puts(seq, ",nouid32");
645 if (test_opt(sb, DEBUG))
646 seq_puts(seq, ",debug");
647 if (test_opt(sb, OLDALLOC))
648 seq_puts(seq, ",oldalloc");
649 #ifdef CONFIG_EXT4_FS_XATTR
650 if (test_opt(sb, XATTR_USER))
651 seq_puts(seq, ",user_xattr");
652 if (!test_opt(sb, XATTR_USER) &&
653 (def_mount_opts & EXT4_DEFM_XATTR_USER)) {
654 seq_puts(seq, ",nouser_xattr");
655 }
656 #endif
657 #ifdef CONFIG_EXT4_FS_POSIX_ACL
658 if (test_opt(sb, POSIX_ACL))
659 seq_puts(seq, ",acl");
660 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT4_DEFM_ACL))
661 seq_puts(seq, ",noacl");
662 #endif
663 if (!test_opt(sb, RESERVATION))
664 seq_puts(seq, ",noreservation");
665 if (sbi->s_commit_interval) {
666 seq_printf(seq, ",commit=%u",
667 (unsigned) (sbi->s_commit_interval / HZ));
668 }
669 if (test_opt(sb, BARRIER))
670 seq_puts(seq, ",barrier=1");
671 if (test_opt(sb, NOBH))
672 seq_puts(seq, ",nobh");
673 if (!test_opt(sb, EXTENTS))
674 seq_puts(seq, ",noextents");
675
676 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
677 seq_puts(seq, ",data=journal");
678 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
679 seq_puts(seq, ",data=ordered");
680 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
681 seq_puts(seq, ",data=writeback");
682
683 ext4_show_quota_options(seq, sb);
684
685 return 0;
686 }
687
688
689 static struct inode *ext4_nfs_get_inode(struct super_block *sb,
690 u64 ino, u32 generation)
691 {
692 struct inode *inode;
693
694 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
695 return ERR_PTR(-ESTALE);
696 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
697 return ERR_PTR(-ESTALE);
698
699 /* iget isn't really right if the inode is currently unallocated!!
700 *
701 * ext4_read_inode will return a bad_inode if the inode had been
702 * deleted, so we should be safe.
703 *
704 * Currently we don't know the generation for parent directory, so
705 * a generation of 0 means "accept any"
706 */
707 inode = iget(sb, ino);
708 if (inode == NULL)
709 return ERR_PTR(-ENOMEM);
710 if (is_bad_inode(inode) ||
711 (generation && inode->i_generation != generation)) {
712 iput(inode);
713 return ERR_PTR(-ESTALE);
714 }
715
716 return inode;
717 }
718
719 static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
720 int fh_len, int fh_type)
721 {
722 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
723 ext4_nfs_get_inode);
724 }
725
726 static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
727 int fh_len, int fh_type)
728 {
729 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
730 ext4_nfs_get_inode);
731 }
732
733 #ifdef CONFIG_QUOTA
734 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
735 #define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
736
737 static int ext4_dquot_initialize(struct inode *inode, int type);
738 static int ext4_dquot_drop(struct inode *inode);
739 static int ext4_write_dquot(struct dquot *dquot);
740 static int ext4_acquire_dquot(struct dquot *dquot);
741 static int ext4_release_dquot(struct dquot *dquot);
742 static int ext4_mark_dquot_dirty(struct dquot *dquot);
743 static int ext4_write_info(struct super_block *sb, int type);
744 static int ext4_quota_on(struct super_block *sb, int type, int format_id, char *path);
745 static int ext4_quota_on_mount(struct super_block *sb, int type);
746 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
747 size_t len, loff_t off);
748 static ssize_t ext4_quota_write(struct super_block *sb, int type,
749 const char *data, size_t len, loff_t off);
750
751 static struct dquot_operations ext4_quota_operations = {
752 .initialize = ext4_dquot_initialize,
753 .drop = ext4_dquot_drop,
754 .alloc_space = dquot_alloc_space,
755 .alloc_inode = dquot_alloc_inode,
756 .free_space = dquot_free_space,
757 .free_inode = dquot_free_inode,
758 .transfer = dquot_transfer,
759 .write_dquot = ext4_write_dquot,
760 .acquire_dquot = ext4_acquire_dquot,
761 .release_dquot = ext4_release_dquot,
762 .mark_dirty = ext4_mark_dquot_dirty,
763 .write_info = ext4_write_info
764 };
765
766 static struct quotactl_ops ext4_qctl_operations = {
767 .quota_on = ext4_quota_on,
768 .quota_off = vfs_quota_off,
769 .quota_sync = vfs_quota_sync,
770 .get_info = vfs_get_dqinfo,
771 .set_info = vfs_set_dqinfo,
772 .get_dqblk = vfs_get_dqblk,
773 .set_dqblk = vfs_set_dqblk
774 };
775 #endif
776
777 static const struct super_operations ext4_sops = {
778 .alloc_inode = ext4_alloc_inode,
779 .destroy_inode = ext4_destroy_inode,
780 .read_inode = ext4_read_inode,
781 .write_inode = ext4_write_inode,
782 .dirty_inode = ext4_dirty_inode,
783 .delete_inode = ext4_delete_inode,
784 .put_super = ext4_put_super,
785 .write_super = ext4_write_super,
786 .sync_fs = ext4_sync_fs,
787 .write_super_lockfs = ext4_write_super_lockfs,
788 .unlockfs = ext4_unlockfs,
789 .statfs = ext4_statfs,
790 .remount_fs = ext4_remount,
791 .clear_inode = ext4_clear_inode,
792 .show_options = ext4_show_options,
793 #ifdef CONFIG_QUOTA
794 .quota_read = ext4_quota_read,
795 .quota_write = ext4_quota_write,
796 #endif
797 };
798
799 static const struct export_operations ext4_export_ops = {
800 .fh_to_dentry = ext4_fh_to_dentry,
801 .fh_to_parent = ext4_fh_to_parent,
802 .get_parent = ext4_get_parent,
803 };
804
805 enum {
806 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
807 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
808 Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
809 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
810 Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh,
811 Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
812 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
813 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
814 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota,
815 Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota,
816 Opt_grpquota, Opt_extents, Opt_noextents,
817 };
818
819 static match_table_t tokens = {
820 {Opt_bsd_df, "bsddf"},
821 {Opt_minix_df, "minixdf"},
822 {Opt_grpid, "grpid"},
823 {Opt_grpid, "bsdgroups"},
824 {Opt_nogrpid, "nogrpid"},
825 {Opt_nogrpid, "sysvgroups"},
826 {Opt_resgid, "resgid=%u"},
827 {Opt_resuid, "resuid=%u"},
828 {Opt_sb, "sb=%u"},
829 {Opt_err_cont, "errors=continue"},
830 {Opt_err_panic, "errors=panic"},
831 {Opt_err_ro, "errors=remount-ro"},
832 {Opt_nouid32, "nouid32"},
833 {Opt_nocheck, "nocheck"},
834 {Opt_nocheck, "check=none"},
835 {Opt_debug, "debug"},
836 {Opt_oldalloc, "oldalloc"},
837 {Opt_orlov, "orlov"},
838 {Opt_user_xattr, "user_xattr"},
839 {Opt_nouser_xattr, "nouser_xattr"},
840 {Opt_acl, "acl"},
841 {Opt_noacl, "noacl"},
842 {Opt_reservation, "reservation"},
843 {Opt_noreservation, "noreservation"},
844 {Opt_noload, "noload"},
845 {Opt_nobh, "nobh"},
846 {Opt_bh, "bh"},
847 {Opt_commit, "commit=%u"},
848 {Opt_journal_update, "journal=update"},
849 {Opt_journal_inum, "journal=%u"},
850 {Opt_journal_dev, "journal_dev=%u"},
851 {Opt_abort, "abort"},
852 {Opt_data_journal, "data=journal"},
853 {Opt_data_ordered, "data=ordered"},
854 {Opt_data_writeback, "data=writeback"},
855 {Opt_offusrjquota, "usrjquota="},
856 {Opt_usrjquota, "usrjquota=%s"},
857 {Opt_offgrpjquota, "grpjquota="},
858 {Opt_grpjquota, "grpjquota=%s"},
859 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
860 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
861 {Opt_grpquota, "grpquota"},
862 {Opt_noquota, "noquota"},
863 {Opt_quota, "quota"},
864 {Opt_usrquota, "usrquota"},
865 {Opt_barrier, "barrier=%u"},
866 {Opt_extents, "extents"},
867 {Opt_noextents, "noextents"},
868 {Opt_err, NULL},
869 {Opt_resize, "resize"},
870 };
871
872 static ext4_fsblk_t get_sb_block(void **data)
873 {
874 ext4_fsblk_t sb_block;
875 char *options = (char *) *data;
876
877 if (!options || strncmp(options, "sb=", 3) != 0)
878 return 1; /* Default location */
879 options += 3;
880 /*todo: use simple_strtoll with >32bit ext4 */
881 sb_block = simple_strtoul(options, &options, 0);
882 if (*options && *options != ',') {
883 printk("EXT4-fs: Invalid sb specification: %s\n",
884 (char *) *data);
885 return 1;
886 }
887 if (*options == ',')
888 options++;
889 *data = (void *) options;
890 return sb_block;
891 }
892
893 static int parse_options (char *options, struct super_block *sb,
894 unsigned int *inum, unsigned long *journal_devnum,
895 ext4_fsblk_t *n_blocks_count, int is_remount)
896 {
897 struct ext4_sb_info *sbi = EXT4_SB(sb);
898 char * p;
899 substring_t args[MAX_OPT_ARGS];
900 int data_opt = 0;
901 int option;
902 #ifdef CONFIG_QUOTA
903 int qtype;
904 char *qname;
905 #endif
906
907 if (!options)
908 return 1;
909
910 while ((p = strsep (&options, ",")) != NULL) {
911 int token;
912 if (!*p)
913 continue;
914
915 token = match_token(p, tokens, args);
916 switch (token) {
917 case Opt_bsd_df:
918 clear_opt (sbi->s_mount_opt, MINIX_DF);
919 break;
920 case Opt_minix_df:
921 set_opt (sbi->s_mount_opt, MINIX_DF);
922 break;
923 case Opt_grpid:
924 set_opt (sbi->s_mount_opt, GRPID);
925 break;
926 case Opt_nogrpid:
927 clear_opt (sbi->s_mount_opt, GRPID);
928 break;
929 case Opt_resuid:
930 if (match_int(&args[0], &option))
931 return 0;
932 sbi->s_resuid = option;
933 break;
934 case Opt_resgid:
935 if (match_int(&args[0], &option))
936 return 0;
937 sbi->s_resgid = option;
938 break;
939 case Opt_sb:
940 /* handled by get_sb_block() instead of here */
941 /* *sb_block = match_int(&args[0]); */
942 break;
943 case Opt_err_panic:
944 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
945 clear_opt (sbi->s_mount_opt, ERRORS_RO);
946 set_opt (sbi->s_mount_opt, ERRORS_PANIC);
947 break;
948 case Opt_err_ro:
949 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
950 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
951 set_opt (sbi->s_mount_opt, ERRORS_RO);
952 break;
953 case Opt_err_cont:
954 clear_opt (sbi->s_mount_opt, ERRORS_RO);
955 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
956 set_opt (sbi->s_mount_opt, ERRORS_CONT);
957 break;
958 case Opt_nouid32:
959 set_opt (sbi->s_mount_opt, NO_UID32);
960 break;
961 case Opt_nocheck:
962 clear_opt (sbi->s_mount_opt, CHECK);
963 break;
964 case Opt_debug:
965 set_opt (sbi->s_mount_opt, DEBUG);
966 break;
967 case Opt_oldalloc:
968 set_opt (sbi->s_mount_opt, OLDALLOC);
969 break;
970 case Opt_orlov:
971 clear_opt (sbi->s_mount_opt, OLDALLOC);
972 break;
973 #ifdef CONFIG_EXT4DEV_FS_XATTR
974 case Opt_user_xattr:
975 set_opt (sbi->s_mount_opt, XATTR_USER);
976 break;
977 case Opt_nouser_xattr:
978 clear_opt (sbi->s_mount_opt, XATTR_USER);
979 break;
980 #else
981 case Opt_user_xattr:
982 case Opt_nouser_xattr:
983 printk("EXT4 (no)user_xattr options not supported\n");
984 break;
985 #endif
986 #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
987 case Opt_acl:
988 set_opt(sbi->s_mount_opt, POSIX_ACL);
989 break;
990 case Opt_noacl:
991 clear_opt(sbi->s_mount_opt, POSIX_ACL);
992 break;
993 #else
994 case Opt_acl:
995 case Opt_noacl:
996 printk("EXT4 (no)acl options not supported\n");
997 break;
998 #endif
999 case Opt_reservation:
1000 set_opt(sbi->s_mount_opt, RESERVATION);
1001 break;
1002 case Opt_noreservation:
1003 clear_opt(sbi->s_mount_opt, RESERVATION);
1004 break;
1005 case Opt_journal_update:
1006 /* @@@ FIXME */
1007 /* Eventually we will want to be able to create
1008 a journal file here. For now, only allow the
1009 user to specify an existing inode to be the
1010 journal file. */
1011 if (is_remount) {
1012 printk(KERN_ERR "EXT4-fs: cannot specify "
1013 "journal on remount\n");
1014 return 0;
1015 }
1016 set_opt (sbi->s_mount_opt, UPDATE_JOURNAL);
1017 break;
1018 case Opt_journal_inum:
1019 if (is_remount) {
1020 printk(KERN_ERR "EXT4-fs: cannot specify "
1021 "journal on remount\n");
1022 return 0;
1023 }
1024 if (match_int(&args[0], &option))
1025 return 0;
1026 *inum = option;
1027 break;
1028 case Opt_journal_dev:
1029 if (is_remount) {
1030 printk(KERN_ERR "EXT4-fs: cannot specify "
1031 "journal on remount\n");
1032 return 0;
1033 }
1034 if (match_int(&args[0], &option))
1035 return 0;
1036 *journal_devnum = option;
1037 break;
1038 case Opt_noload:
1039 set_opt (sbi->s_mount_opt, NOLOAD);
1040 break;
1041 case Opt_commit:
1042 if (match_int(&args[0], &option))
1043 return 0;
1044 if (option < 0)
1045 return 0;
1046 if (option == 0)
1047 option = JBD2_DEFAULT_MAX_COMMIT_AGE;
1048 sbi->s_commit_interval = HZ * option;
1049 break;
1050 case Opt_data_journal:
1051 data_opt = EXT4_MOUNT_JOURNAL_DATA;
1052 goto datacheck;
1053 case Opt_data_ordered:
1054 data_opt = EXT4_MOUNT_ORDERED_DATA;
1055 goto datacheck;
1056 case Opt_data_writeback:
1057 data_opt = EXT4_MOUNT_WRITEBACK_DATA;
1058 datacheck:
1059 if (is_remount) {
1060 if ((sbi->s_mount_opt & EXT4_MOUNT_DATA_FLAGS)
1061 != data_opt) {
1062 printk(KERN_ERR
1063 "EXT4-fs: cannot change data "
1064 "mode on remount\n");
1065 return 0;
1066 }
1067 } else {
1068 sbi->s_mount_opt &= ~EXT4_MOUNT_DATA_FLAGS;
1069 sbi->s_mount_opt |= data_opt;
1070 }
1071 break;
1072 #ifdef CONFIG_QUOTA
1073 case Opt_usrjquota:
1074 qtype = USRQUOTA;
1075 goto set_qf_name;
1076 case Opt_grpjquota:
1077 qtype = GRPQUOTA;
1078 set_qf_name:
1079 if (sb_any_quota_enabled(sb)) {
1080 printk(KERN_ERR
1081 "EXT4-fs: Cannot change journalled "
1082 "quota options when quota turned on.\n");
1083 return 0;
1084 }
1085 qname = match_strdup(&args[0]);
1086 if (!qname) {
1087 printk(KERN_ERR
1088 "EXT4-fs: not enough memory for "
1089 "storing quotafile name.\n");
1090 return 0;
1091 }
1092 if (sbi->s_qf_names[qtype] &&
1093 strcmp(sbi->s_qf_names[qtype], qname)) {
1094 printk(KERN_ERR
1095 "EXT4-fs: %s quota file already "
1096 "specified.\n", QTYPE2NAME(qtype));
1097 kfree(qname);
1098 return 0;
1099 }
1100 sbi->s_qf_names[qtype] = qname;
1101 if (strchr(sbi->s_qf_names[qtype], '/')) {
1102 printk(KERN_ERR
1103 "EXT4-fs: quotafile must be on "
1104 "filesystem root.\n");
1105 kfree(sbi->s_qf_names[qtype]);
1106 sbi->s_qf_names[qtype] = NULL;
1107 return 0;
1108 }
1109 set_opt(sbi->s_mount_opt, QUOTA);
1110 break;
1111 case Opt_offusrjquota:
1112 qtype = USRQUOTA;
1113 goto clear_qf_name;
1114 case Opt_offgrpjquota:
1115 qtype = GRPQUOTA;
1116 clear_qf_name:
1117 if (sb_any_quota_enabled(sb)) {
1118 printk(KERN_ERR "EXT4-fs: Cannot change "
1119 "journalled quota options when "
1120 "quota turned on.\n");
1121 return 0;
1122 }
1123 /*
1124 * The space will be released later when all options
1125 * are confirmed to be correct
1126 */
1127 sbi->s_qf_names[qtype] = NULL;
1128 break;
1129 case Opt_jqfmt_vfsold:
1130 sbi->s_jquota_fmt = QFMT_VFS_OLD;
1131 break;
1132 case Opt_jqfmt_vfsv0:
1133 sbi->s_jquota_fmt = QFMT_VFS_V0;
1134 break;
1135 case Opt_quota:
1136 case Opt_usrquota:
1137 set_opt(sbi->s_mount_opt, QUOTA);
1138 set_opt(sbi->s_mount_opt, USRQUOTA);
1139 break;
1140 case Opt_grpquota:
1141 set_opt(sbi->s_mount_opt, QUOTA);
1142 set_opt(sbi->s_mount_opt, GRPQUOTA);
1143 break;
1144 case Opt_noquota:
1145 if (sb_any_quota_enabled(sb)) {
1146 printk(KERN_ERR "EXT4-fs: Cannot change quota "
1147 "options when quota turned on.\n");
1148 return 0;
1149 }
1150 clear_opt(sbi->s_mount_opt, QUOTA);
1151 clear_opt(sbi->s_mount_opt, USRQUOTA);
1152 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1153 break;
1154 #else
1155 case Opt_quota:
1156 case Opt_usrquota:
1157 case Opt_grpquota:
1158 case Opt_usrjquota:
1159 case Opt_grpjquota:
1160 case Opt_offusrjquota:
1161 case Opt_offgrpjquota:
1162 case Opt_jqfmt_vfsold:
1163 case Opt_jqfmt_vfsv0:
1164 printk(KERN_ERR
1165 "EXT4-fs: journalled quota options not "
1166 "supported.\n");
1167 break;
1168 case Opt_noquota:
1169 break;
1170 #endif
1171 case Opt_abort:
1172 set_opt(sbi->s_mount_opt, ABORT);
1173 break;
1174 case Opt_barrier:
1175 if (match_int(&args[0], &option))
1176 return 0;
1177 if (option)
1178 set_opt(sbi->s_mount_opt, BARRIER);
1179 else
1180 clear_opt(sbi->s_mount_opt, BARRIER);
1181 break;
1182 case Opt_ignore:
1183 break;
1184 case Opt_resize:
1185 if (!is_remount) {
1186 printk("EXT4-fs: resize option only available "
1187 "for remount\n");
1188 return 0;
1189 }
1190 if (match_int(&args[0], &option) != 0)
1191 return 0;
1192 *n_blocks_count = option;
1193 break;
1194 case Opt_nobh:
1195 set_opt(sbi->s_mount_opt, NOBH);
1196 break;
1197 case Opt_bh:
1198 clear_opt(sbi->s_mount_opt, NOBH);
1199 break;
1200 case Opt_extents:
1201 set_opt (sbi->s_mount_opt, EXTENTS);
1202 break;
1203 case Opt_noextents:
1204 clear_opt (sbi->s_mount_opt, EXTENTS);
1205 break;
1206 default:
1207 printk (KERN_ERR
1208 "EXT4-fs: Unrecognized mount option \"%s\" "
1209 "or missing value\n", p);
1210 return 0;
1211 }
1212 }
1213 #ifdef CONFIG_QUOTA
1214 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1215 if ((sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA) &&
1216 sbi->s_qf_names[USRQUOTA])
1217 clear_opt(sbi->s_mount_opt, USRQUOTA);
1218
1219 if ((sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA) &&
1220 sbi->s_qf_names[GRPQUOTA])
1221 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1222
1223 if ((sbi->s_qf_names[USRQUOTA] &&
1224 (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)) ||
1225 (sbi->s_qf_names[GRPQUOTA] &&
1226 (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA))) {
1227 printk(KERN_ERR "EXT4-fs: old and new quota "
1228 "format mixing.\n");
1229 return 0;
1230 }
1231
1232 if (!sbi->s_jquota_fmt) {
1233 printk(KERN_ERR "EXT4-fs: journalled quota format "
1234 "not specified.\n");
1235 return 0;
1236 }
1237 } else {
1238 if (sbi->s_jquota_fmt) {
1239 printk(KERN_ERR "EXT4-fs: journalled quota format "
1240 "specified with no journalling "
1241 "enabled.\n");
1242 return 0;
1243 }
1244 }
1245 #endif
1246 return 1;
1247 }
1248
1249 static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
1250 int read_only)
1251 {
1252 struct ext4_sb_info *sbi = EXT4_SB(sb);
1253 int res = 0;
1254
1255 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
1256 printk (KERN_ERR "EXT4-fs warning: revision level too high, "
1257 "forcing read-only mode\n");
1258 res = MS_RDONLY;
1259 }
1260 if (read_only)
1261 return res;
1262 if (!(sbi->s_mount_state & EXT4_VALID_FS))
1263 printk (KERN_WARNING "EXT4-fs warning: mounting unchecked fs, "
1264 "running e2fsck is recommended\n");
1265 else if ((sbi->s_mount_state & EXT4_ERROR_FS))
1266 printk (KERN_WARNING
1267 "EXT4-fs warning: mounting fs with errors, "
1268 "running e2fsck is recommended\n");
1269 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
1270 le16_to_cpu(es->s_mnt_count) >=
1271 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
1272 printk (KERN_WARNING
1273 "EXT4-fs warning: maximal mount count reached, "
1274 "running e2fsck is recommended\n");
1275 else if (le32_to_cpu(es->s_checkinterval) &&
1276 (le32_to_cpu(es->s_lastcheck) +
1277 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1278 printk (KERN_WARNING
1279 "EXT4-fs warning: checktime reached, "
1280 "running e2fsck is recommended\n");
1281 #if 0
1282 /* @@@ We _will_ want to clear the valid bit if we find
1283 * inconsistencies, to force a fsck at reboot. But for
1284 * a plain journaled filesystem we can keep it set as
1285 * valid forever! :)
1286 */
1287 es->s_state = cpu_to_le16(le16_to_cpu(es->s_state) & ~EXT4_VALID_FS);
1288 #endif
1289 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
1290 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
1291 es->s_mnt_count=cpu_to_le16(le16_to_cpu(es->s_mnt_count) + 1);
1292 es->s_mtime = cpu_to_le32(get_seconds());
1293 ext4_update_dynamic_rev(sb);
1294 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
1295
1296 ext4_commit_super(sb, es, 1);
1297 if (test_opt(sb, DEBUG))
1298 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%lu, "
1299 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
1300 sb->s_blocksize,
1301 sbi->s_groups_count,
1302 EXT4_BLOCKS_PER_GROUP(sb),
1303 EXT4_INODES_PER_GROUP(sb),
1304 sbi->s_mount_opt);
1305
1306 printk(KERN_INFO "EXT4 FS on %s, ", sb->s_id);
1307 if (EXT4_SB(sb)->s_journal->j_inode == NULL) {
1308 char b[BDEVNAME_SIZE];
1309
1310 printk("external journal on %s\n",
1311 bdevname(EXT4_SB(sb)->s_journal->j_dev, b));
1312 } else {
1313 printk("internal journal\n");
1314 }
1315 return res;
1316 }
1317
1318 __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
1319 struct ext4_group_desc *gdp)
1320 {
1321 __u16 crc = 0;
1322
1323 if (sbi->s_es->s_feature_ro_compat &
1324 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) {
1325 int offset = offsetof(struct ext4_group_desc, bg_checksum);
1326 __le32 le_group = cpu_to_le32(block_group);
1327
1328 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
1329 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
1330 crc = crc16(crc, (__u8 *)gdp, offset);
1331 offset += sizeof(gdp->bg_checksum); /* skip checksum */
1332 /* for checksum of struct ext4_group_desc do the rest...*/
1333 if ((sbi->s_es->s_feature_incompat &
1334 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) &&
1335 offset < le16_to_cpu(sbi->s_es->s_desc_size))
1336 crc = crc16(crc, (__u8 *)gdp + offset,
1337 le16_to_cpu(sbi->s_es->s_desc_size) -
1338 offset);
1339 }
1340
1341 return cpu_to_le16(crc);
1342 }
1343
1344 int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 block_group,
1345 struct ext4_group_desc *gdp)
1346 {
1347 if ((sbi->s_es->s_feature_ro_compat &
1348 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) &&
1349 (gdp->bg_checksum != ext4_group_desc_csum(sbi, block_group, gdp)))
1350 return 0;
1351
1352 return 1;
1353 }
1354
1355 /* Called at mount-time, super-block is locked */
1356 static int ext4_check_descriptors (struct super_block * sb)
1357 {
1358 struct ext4_sb_info *sbi = EXT4_SB(sb);
1359 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
1360 ext4_fsblk_t last_block;
1361 ext4_fsblk_t block_bitmap;
1362 ext4_fsblk_t inode_bitmap;
1363 ext4_fsblk_t inode_table;
1364 struct ext4_group_desc * gdp = NULL;
1365 int desc_block = 0;
1366 int flexbg_flag = 0;
1367 int i;
1368
1369 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
1370 flexbg_flag = 1;
1371
1372 ext4_debug ("Checking group descriptors");
1373
1374 for (i = 0; i < sbi->s_groups_count; i++)
1375 {
1376 if (i == sbi->s_groups_count - 1 || flexbg_flag)
1377 last_block = ext4_blocks_count(sbi->s_es) - 1;
1378 else
1379 last_block = first_block +
1380 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
1381
1382 if ((i % EXT4_DESC_PER_BLOCK(sb)) == 0)
1383 gdp = (struct ext4_group_desc *)
1384 sbi->s_group_desc[desc_block++]->b_data;
1385 block_bitmap = ext4_block_bitmap(sb, gdp);
1386 if (block_bitmap < first_block || block_bitmap > last_block)
1387 {
1388 ext4_error (sb, "ext4_check_descriptors",
1389 "Block bitmap for group %d"
1390 " not in group (block %llu)!",
1391 i, block_bitmap);
1392 return 0;
1393 }
1394 inode_bitmap = ext4_inode_bitmap(sb, gdp);
1395 if (inode_bitmap < first_block || inode_bitmap > last_block)
1396 {
1397 ext4_error (sb, "ext4_check_descriptors",
1398 "Inode bitmap for group %d"
1399 " not in group (block %llu)!",
1400 i, inode_bitmap);
1401 return 0;
1402 }
1403 inode_table = ext4_inode_table(sb, gdp);
1404 if (inode_table < first_block ||
1405 inode_table + sbi->s_itb_per_group - 1 > last_block)
1406 {
1407 ext4_error (sb, "ext4_check_descriptors",
1408 "Inode table for group %d"
1409 " not in group (block %llu)!",
1410 i, inode_table);
1411 return 0;
1412 }
1413 if (!ext4_group_desc_csum_verify(sbi, i, gdp)) {
1414 ext4_error(sb, __FUNCTION__,
1415 "Checksum for group %d failed (%u!=%u)\n", i,
1416 le16_to_cpu(ext4_group_desc_csum(sbi, i,
1417 gdp)),
1418 le16_to_cpu(gdp->bg_checksum));
1419 return 0;
1420 }
1421 if (!flexbg_flag)
1422 first_block += EXT4_BLOCKS_PER_GROUP(sb);
1423 gdp = (struct ext4_group_desc *)
1424 ((__u8 *)gdp + EXT4_DESC_SIZE(sb));
1425 }
1426
1427 ext4_free_blocks_count_set(sbi->s_es, ext4_count_free_blocks(sb));
1428 sbi->s_es->s_free_inodes_count=cpu_to_le32(ext4_count_free_inodes(sb));
1429 return 1;
1430 }
1431
1432
1433 /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
1434 * the superblock) which were deleted from all directories, but held open by
1435 * a process at the time of a crash. We walk the list and try to delete these
1436 * inodes at recovery time (only with a read-write filesystem).
1437 *
1438 * In order to keep the orphan inode chain consistent during traversal (in
1439 * case of crash during recovery), we link each inode into the superblock
1440 * orphan list_head and handle it the same way as an inode deletion during
1441 * normal operation (which journals the operations for us).
1442 *
1443 * We only do an iget() and an iput() on each inode, which is very safe if we
1444 * accidentally point at an in-use or already deleted inode. The worst that
1445 * can happen in this case is that we get a "bit already cleared" message from
1446 * ext4_free_inode(). The only reason we would point at a wrong inode is if
1447 * e2fsck was run on this filesystem, and it must have already done the orphan
1448 * inode cleanup for us, so we can safely abort without any further action.
1449 */
1450 static void ext4_orphan_cleanup (struct super_block * sb,
1451 struct ext4_super_block * es)
1452 {
1453 unsigned int s_flags = sb->s_flags;
1454 int nr_orphans = 0, nr_truncates = 0;
1455 #ifdef CONFIG_QUOTA
1456 int i;
1457 #endif
1458 if (!es->s_last_orphan) {
1459 jbd_debug(4, "no orphan inodes to clean up\n");
1460 return;
1461 }
1462
1463 if (bdev_read_only(sb->s_bdev)) {
1464 printk(KERN_ERR "EXT4-fs: write access "
1465 "unavailable, skipping orphan cleanup.\n");
1466 return;
1467 }
1468
1469 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
1470 if (es->s_last_orphan)
1471 jbd_debug(1, "Errors on filesystem, "
1472 "clearing orphan list.\n");
1473 es->s_last_orphan = 0;
1474 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1475 return;
1476 }
1477
1478 if (s_flags & MS_RDONLY) {
1479 printk(KERN_INFO "EXT4-fs: %s: orphan cleanup on readonly fs\n",
1480 sb->s_id);
1481 sb->s_flags &= ~MS_RDONLY;
1482 }
1483 #ifdef CONFIG_QUOTA
1484 /* Needed for iput() to work correctly and not trash data */
1485 sb->s_flags |= MS_ACTIVE;
1486 /* Turn on quotas so that they are updated correctly */
1487 for (i = 0; i < MAXQUOTAS; i++) {
1488 if (EXT4_SB(sb)->s_qf_names[i]) {
1489 int ret = ext4_quota_on_mount(sb, i);
1490 if (ret < 0)
1491 printk(KERN_ERR
1492 "EXT4-fs: Cannot turn on journalled "
1493 "quota: error %d\n", ret);
1494 }
1495 }
1496 #endif
1497
1498 while (es->s_last_orphan) {
1499 struct inode *inode;
1500
1501 if (!(inode =
1502 ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan)))) {
1503 es->s_last_orphan = 0;
1504 break;
1505 }
1506
1507 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
1508 DQUOT_INIT(inode);
1509 if (inode->i_nlink) {
1510 printk(KERN_DEBUG
1511 "%s: truncating inode %lu to %Ld bytes\n",
1512 __FUNCTION__, inode->i_ino, inode->i_size);
1513 jbd_debug(2, "truncating inode %lu to %Ld bytes\n",
1514 inode->i_ino, inode->i_size);
1515 ext4_truncate(inode);
1516 nr_truncates++;
1517 } else {
1518 printk(KERN_DEBUG
1519 "%s: deleting unreferenced inode %lu\n",
1520 __FUNCTION__, inode->i_ino);
1521 jbd_debug(2, "deleting unreferenced inode %lu\n",
1522 inode->i_ino);
1523 nr_orphans++;
1524 }
1525 iput(inode); /* The delete magic happens here! */
1526 }
1527
1528 #define PLURAL(x) (x), ((x)==1) ? "" : "s"
1529
1530 if (nr_orphans)
1531 printk(KERN_INFO "EXT4-fs: %s: %d orphan inode%s deleted\n",
1532 sb->s_id, PLURAL(nr_orphans));
1533 if (nr_truncates)
1534 printk(KERN_INFO "EXT4-fs: %s: %d truncate%s cleaned up\n",
1535 sb->s_id, PLURAL(nr_truncates));
1536 #ifdef CONFIG_QUOTA
1537 /* Turn quotas off */
1538 for (i = 0; i < MAXQUOTAS; i++) {
1539 if (sb_dqopt(sb)->files[i])
1540 vfs_quota_off(sb, i);
1541 }
1542 #endif
1543 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1544 }
1545
1546 /*
1547 * Maximal file size. There is a direct, and {,double-,triple-}indirect
1548 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
1549 * We need to be 1 filesystem block less than the 2^32 sector limit.
1550 */
1551 static loff_t ext4_max_size(int bits)
1552 {
1553 loff_t res = EXT4_NDIR_BLOCKS;
1554 /* This constant is calculated to be the largest file size for a
1555 * dense, 4k-blocksize file such that the total number of
1556 * sectors in the file, including data and all indirect blocks,
1557 * does not exceed 2^32. */
1558 const loff_t upper_limit = 0x1ff7fffd000LL;
1559
1560 res += 1LL << (bits-2);
1561 res += 1LL << (2*(bits-2));
1562 res += 1LL << (3*(bits-2));
1563 res <<= bits;
1564 if (res > upper_limit)
1565 res = upper_limit;
1566 return res;
1567 }
1568
1569 static ext4_fsblk_t descriptor_loc(struct super_block *sb,
1570 ext4_fsblk_t logical_sb_block, int nr)
1571 {
1572 struct ext4_sb_info *sbi = EXT4_SB(sb);
1573 unsigned long bg, first_meta_bg;
1574 int has_super = 0;
1575
1576 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1577
1578 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
1579 nr < first_meta_bg)
1580 return logical_sb_block + nr + 1;
1581 bg = sbi->s_desc_per_block * nr;
1582 if (ext4_bg_has_super(sb, bg))
1583 has_super = 1;
1584 return (has_super + ext4_group_first_block_no(sb, bg));
1585 }
1586
1587
1588 static int ext4_fill_super (struct super_block *sb, void *data, int silent)
1589 {
1590 struct buffer_head * bh;
1591 struct ext4_super_block *es = NULL;
1592 struct ext4_sb_info *sbi;
1593 ext4_fsblk_t block;
1594 ext4_fsblk_t sb_block = get_sb_block(&data);
1595 ext4_fsblk_t logical_sb_block;
1596 unsigned long offset = 0;
1597 unsigned int journal_inum = 0;
1598 unsigned long journal_devnum = 0;
1599 unsigned long def_mount_opts;
1600 struct inode *root;
1601 int blocksize;
1602 int hblock;
1603 int db_count;
1604 int i;
1605 int needs_recovery;
1606 __le32 features;
1607 __u64 blocks_count;
1608 int err;
1609
1610 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
1611 if (!sbi)
1612 return -ENOMEM;
1613 sb->s_fs_info = sbi;
1614 sbi->s_mount_opt = 0;
1615 sbi->s_resuid = EXT4_DEF_RESUID;
1616 sbi->s_resgid = EXT4_DEF_RESGID;
1617 sbi->s_sb_block = sb_block;
1618
1619 unlock_kernel();
1620
1621 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
1622 if (!blocksize) {
1623 printk(KERN_ERR "EXT4-fs: unable to set blocksize\n");
1624 goto out_fail;
1625 }
1626
1627 /*
1628 * The ext4 superblock will not be buffer aligned for other than 1kB
1629 * block sizes. We need to calculate the offset from buffer start.
1630 */
1631 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
1632 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
1633 offset = do_div(logical_sb_block, blocksize);
1634 } else {
1635 logical_sb_block = sb_block;
1636 }
1637
1638 if (!(bh = sb_bread(sb, logical_sb_block))) {
1639 printk (KERN_ERR "EXT4-fs: unable to read superblock\n");
1640 goto out_fail;
1641 }
1642 /*
1643 * Note: s_es must be initialized as soon as possible because
1644 * some ext4 macro-instructions depend on its value
1645 */
1646 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
1647 sbi->s_es = es;
1648 sb->s_magic = le16_to_cpu(es->s_magic);
1649 if (sb->s_magic != EXT4_SUPER_MAGIC)
1650 goto cantfind_ext4;
1651
1652 /* Set defaults before we parse the mount options */
1653 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
1654 if (def_mount_opts & EXT4_DEFM_DEBUG)
1655 set_opt(sbi->s_mount_opt, DEBUG);
1656 if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
1657 set_opt(sbi->s_mount_opt, GRPID);
1658 if (def_mount_opts & EXT4_DEFM_UID16)
1659 set_opt(sbi->s_mount_opt, NO_UID32);
1660 #ifdef CONFIG_EXT4DEV_FS_XATTR
1661 if (def_mount_opts & EXT4_DEFM_XATTR_USER)
1662 set_opt(sbi->s_mount_opt, XATTR_USER);
1663 #endif
1664 #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
1665 if (def_mount_opts & EXT4_DEFM_ACL)
1666 set_opt(sbi->s_mount_opt, POSIX_ACL);
1667 #endif
1668 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
1669 sbi->s_mount_opt |= EXT4_MOUNT_JOURNAL_DATA;
1670 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
1671 sbi->s_mount_opt |= EXT4_MOUNT_ORDERED_DATA;
1672 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
1673 sbi->s_mount_opt |= EXT4_MOUNT_WRITEBACK_DATA;
1674
1675 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
1676 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1677 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_RO)
1678 set_opt(sbi->s_mount_opt, ERRORS_RO);
1679 else
1680 set_opt(sbi->s_mount_opt, ERRORS_CONT);
1681
1682 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
1683 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
1684
1685 set_opt(sbi->s_mount_opt, RESERVATION);
1686
1687 /*
1688 * turn on extents feature by default in ext4 filesystem
1689 * User -o noextents to turn it off
1690 */
1691 set_opt(sbi->s_mount_opt, EXTENTS);
1692
1693 if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
1694 NULL, 0))
1695 goto failed_mount;
1696
1697 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1698 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
1699
1700 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
1701 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
1702 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
1703 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
1704 printk(KERN_WARNING
1705 "EXT4-fs warning: feature flags set on rev 0 fs, "
1706 "running e2fsck is recommended\n");
1707 /*
1708 * Check feature flags regardless of the revision level, since we
1709 * previously didn't change the revision level when setting the flags,
1710 * so there is a chance incompat flags are set on a rev 0 filesystem.
1711 */
1712 features = EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP);
1713 if (features) {
1714 printk(KERN_ERR "EXT4-fs: %s: couldn't mount because of "
1715 "unsupported optional features (%x).\n",
1716 sb->s_id, le32_to_cpu(features));
1717 goto failed_mount;
1718 }
1719 features = EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP);
1720 if (!(sb->s_flags & MS_RDONLY) && features) {
1721 printk(KERN_ERR "EXT4-fs: %s: couldn't mount RDWR because of "
1722 "unsupported optional features (%x).\n",
1723 sb->s_id, le32_to_cpu(features));
1724 goto failed_mount;
1725 }
1726 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
1727
1728 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
1729 blocksize > EXT4_MAX_BLOCK_SIZE) {
1730 printk(KERN_ERR
1731 "EXT4-fs: Unsupported filesystem blocksize %d on %s.\n",
1732 blocksize, sb->s_id);
1733 goto failed_mount;
1734 }
1735
1736 hblock = bdev_hardsect_size(sb->s_bdev);
1737 if (sb->s_blocksize != blocksize) {
1738 /*
1739 * Make sure the blocksize for the filesystem is larger
1740 * than the hardware sectorsize for the machine.
1741 */
1742 if (blocksize < hblock) {
1743 printk(KERN_ERR "EXT4-fs: blocksize %d too small for "
1744 "device blocksize %d.\n", blocksize, hblock);
1745 goto failed_mount;
1746 }
1747
1748 brelse (bh);
1749 sb_set_blocksize(sb, blocksize);
1750 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
1751 offset = do_div(logical_sb_block, blocksize);
1752 bh = sb_bread(sb, logical_sb_block);
1753 if (!bh) {
1754 printk(KERN_ERR
1755 "EXT4-fs: Can't read superblock on 2nd try.\n");
1756 goto failed_mount;
1757 }
1758 es = (struct ext4_super_block *)(((char *)bh->b_data) + offset);
1759 sbi->s_es = es;
1760 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
1761 printk (KERN_ERR
1762 "EXT4-fs: Magic mismatch, very weird !\n");
1763 goto failed_mount;
1764 }
1765 }
1766
1767 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits);
1768
1769 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
1770 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
1771 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
1772 } else {
1773 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
1774 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
1775 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
1776 (!is_power_of_2(sbi->s_inode_size)) ||
1777 (sbi->s_inode_size > blocksize)) {
1778 printk (KERN_ERR
1779 "EXT4-fs: unsupported inode size: %d\n",
1780 sbi->s_inode_size);
1781 goto failed_mount;
1782 }
1783 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
1784 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
1785 }
1786 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
1787 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
1788 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
1789 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
1790 !is_power_of_2(sbi->s_desc_size)) {
1791 printk(KERN_ERR
1792 "EXT4-fs: unsupported descriptor size %lu\n",
1793 sbi->s_desc_size);
1794 goto failed_mount;
1795 }
1796 } else
1797 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
1798 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
1799 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
1800 if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
1801 goto cantfind_ext4;
1802 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
1803 if (sbi->s_inodes_per_block == 0)
1804 goto cantfind_ext4;
1805 sbi->s_itb_per_group = sbi->s_inodes_per_group /
1806 sbi->s_inodes_per_block;
1807 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
1808 sbi->s_sbh = bh;
1809 sbi->s_mount_state = le16_to_cpu(es->s_state);
1810 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
1811 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
1812 for (i=0; i < 4; i++)
1813 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
1814 sbi->s_def_hash_version = es->s_def_hash_version;
1815
1816 if (sbi->s_blocks_per_group > blocksize * 8) {
1817 printk (KERN_ERR
1818 "EXT4-fs: #blocks per group too big: %lu\n",
1819 sbi->s_blocks_per_group);
1820 goto failed_mount;
1821 }
1822 if (sbi->s_inodes_per_group > blocksize * 8) {
1823 printk (KERN_ERR
1824 "EXT4-fs: #inodes per group too big: %lu\n",
1825 sbi->s_inodes_per_group);
1826 goto failed_mount;
1827 }
1828
1829 if (ext4_blocks_count(es) >
1830 (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) {
1831 printk(KERN_ERR "EXT4-fs: filesystem on %s:"
1832 " too large to mount safely\n", sb->s_id);
1833 if (sizeof(sector_t) < 8)
1834 printk(KERN_WARNING "EXT4-fs: CONFIG_LBD not "
1835 "enabled\n");
1836 goto failed_mount;
1837 }
1838
1839 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
1840 goto cantfind_ext4;
1841 blocks_count = (ext4_blocks_count(es) -
1842 le32_to_cpu(es->s_first_data_block) +
1843 EXT4_BLOCKS_PER_GROUP(sb) - 1);
1844 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
1845 sbi->s_groups_count = blocks_count;
1846 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
1847 EXT4_DESC_PER_BLOCK(sb);
1848 sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
1849 GFP_KERNEL);
1850 if (sbi->s_group_desc == NULL) {
1851 printk (KERN_ERR "EXT4-fs: not enough memory\n");
1852 goto failed_mount;
1853 }
1854
1855 bgl_lock_init(&sbi->s_blockgroup_lock);
1856
1857 for (i = 0; i < db_count; i++) {
1858 block = descriptor_loc(sb, logical_sb_block, i);
1859 sbi->s_group_desc[i] = sb_bread(sb, block);
1860 if (!sbi->s_group_desc[i]) {
1861 printk (KERN_ERR "EXT4-fs: "
1862 "can't read group descriptor %d\n", i);
1863 db_count = i;
1864 goto failed_mount2;
1865 }
1866 }
1867 if (!ext4_check_descriptors (sb)) {
1868 printk(KERN_ERR "EXT4-fs: group descriptors corrupted!\n");
1869 goto failed_mount2;
1870 }
1871 sbi->s_gdb_count = db_count;
1872 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1873 spin_lock_init(&sbi->s_next_gen_lock);
1874
1875 err = percpu_counter_init(&sbi->s_freeblocks_counter,
1876 ext4_count_free_blocks(sb));
1877 if (!err) {
1878 err = percpu_counter_init(&sbi->s_freeinodes_counter,
1879 ext4_count_free_inodes(sb));
1880 }
1881 if (!err) {
1882 err = percpu_counter_init(&sbi->s_dirs_counter,
1883 ext4_count_dirs(sb));
1884 }
1885 if (err) {
1886 printk(KERN_ERR "EXT4-fs: insufficient memory\n");
1887 goto failed_mount3;
1888 }
1889
1890 /* per fileystem reservation list head & lock */
1891 spin_lock_init(&sbi->s_rsv_window_lock);
1892 sbi->s_rsv_window_root = RB_ROOT;
1893 /* Add a single, static dummy reservation to the start of the
1894 * reservation window list --- it gives us a placeholder for
1895 * append-at-start-of-list which makes the allocation logic
1896 * _much_ simpler. */
1897 sbi->s_rsv_window_head.rsv_start = EXT4_RESERVE_WINDOW_NOT_ALLOCATED;
1898 sbi->s_rsv_window_head.rsv_end = EXT4_RESERVE_WINDOW_NOT_ALLOCATED;
1899 sbi->s_rsv_window_head.rsv_alloc_hit = 0;
1900 sbi->s_rsv_window_head.rsv_goal_size = 0;
1901 ext4_rsv_window_add(sb, &sbi->s_rsv_window_head);
1902
1903 /*
1904 * set up enough so that it can read an inode
1905 */
1906 sb->s_op = &ext4_sops;
1907 sb->s_export_op = &ext4_export_ops;
1908 sb->s_xattr = ext4_xattr_handlers;
1909 #ifdef CONFIG_QUOTA
1910 sb->s_qcop = &ext4_qctl_operations;
1911 sb->dq_op = &ext4_quota_operations;
1912 #endif
1913 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
1914
1915 sb->s_root = NULL;
1916
1917 needs_recovery = (es->s_last_orphan != 0 ||
1918 EXT4_HAS_INCOMPAT_FEATURE(sb,
1919 EXT4_FEATURE_INCOMPAT_RECOVER));
1920
1921 /*
1922 * The first inode we look at is the journal inode. Don't try
1923 * root first: it may be modified in the journal!
1924 */
1925 if (!test_opt(sb, NOLOAD) &&
1926 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
1927 if (ext4_load_journal(sb, es, journal_devnum))
1928 goto failed_mount3;
1929 } else if (journal_inum) {
1930 if (ext4_create_journal(sb, es, journal_inum))
1931 goto failed_mount3;
1932 } else {
1933 if (!silent)
1934 printk (KERN_ERR
1935 "ext4: No journal on filesystem on %s\n",
1936 sb->s_id);
1937 goto failed_mount3;
1938 }
1939
1940 if (ext4_blocks_count(es) > 0xffffffffULL &&
1941 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
1942 JBD2_FEATURE_INCOMPAT_64BIT)) {
1943 printk(KERN_ERR "ext4: Failed to set 64-bit journal feature\n");
1944 goto failed_mount4;
1945 }
1946
1947 /* We have now updated the journal if required, so we can
1948 * validate the data journaling mode. */
1949 switch (test_opt(sb, DATA_FLAGS)) {
1950 case 0:
1951 /* No mode set, assume a default based on the journal
1952 * capabilities: ORDERED_DATA if the journal can
1953 * cope, else JOURNAL_DATA
1954 */
1955 if (jbd2_journal_check_available_features
1956 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
1957 set_opt(sbi->s_mount_opt, ORDERED_DATA);
1958 else
1959 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
1960 break;
1961
1962 case EXT4_MOUNT_ORDERED_DATA:
1963 case EXT4_MOUNT_WRITEBACK_DATA:
1964 if (!jbd2_journal_check_available_features
1965 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
1966 printk(KERN_ERR "EXT4-fs: Journal does not support "
1967 "requested data journaling mode\n");
1968 goto failed_mount4;
1969 }
1970 default:
1971 break;
1972 }
1973
1974 if (test_opt(sb, NOBH)) {
1975 if (!(test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)) {
1976 printk(KERN_WARNING "EXT4-fs: Ignoring nobh option - "
1977 "its supported only with writeback mode\n");
1978 clear_opt(sbi->s_mount_opt, NOBH);
1979 }
1980 }
1981 /*
1982 * The jbd2_journal_load will have done any necessary log recovery,
1983 * so we can safely mount the rest of the filesystem now.
1984 */
1985
1986 root = iget(sb, EXT4_ROOT_INO);
1987 sb->s_root = d_alloc_root(root);
1988 if (!sb->s_root) {
1989 printk(KERN_ERR "EXT4-fs: get root inode failed\n");
1990 iput(root);
1991 goto failed_mount4;
1992 }
1993 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1994 dput(sb->s_root);
1995 sb->s_root = NULL;
1996 printk(KERN_ERR "EXT4-fs: corrupt root inode, run e2fsck\n");
1997 goto failed_mount4;
1998 }
1999
2000 ext4_setup_super (sb, es, sb->s_flags & MS_RDONLY);
2001
2002 /* determine the minimum size of new large inodes, if present */
2003 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
2004 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
2005 EXT4_GOOD_OLD_INODE_SIZE;
2006 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
2007 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) {
2008 if (sbi->s_want_extra_isize <
2009 le16_to_cpu(es->s_want_extra_isize))
2010 sbi->s_want_extra_isize =
2011 le16_to_cpu(es->s_want_extra_isize);
2012 if (sbi->s_want_extra_isize <
2013 le16_to_cpu(es->s_min_extra_isize))
2014 sbi->s_want_extra_isize =
2015 le16_to_cpu(es->s_min_extra_isize);
2016 }
2017 }
2018 /* Check if enough inode space is available */
2019 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
2020 sbi->s_inode_size) {
2021 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
2022 EXT4_GOOD_OLD_INODE_SIZE;
2023 printk(KERN_INFO "EXT4-fs: required extra inode space not"
2024 "available.\n");
2025 }
2026
2027 /*
2028 * akpm: core read_super() calls in here with the superblock locked.
2029 * That deadlocks, because orphan cleanup needs to lock the superblock
2030 * in numerous places. Here we just pop the lock - it's relatively
2031 * harmless, because we are now ready to accept write_super() requests,
2032 * and aviro says that's the only reason for hanging onto the
2033 * superblock lock.
2034 */
2035 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
2036 ext4_orphan_cleanup(sb, es);
2037 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
2038 if (needs_recovery)
2039 printk (KERN_INFO "EXT4-fs: recovery complete.\n");
2040 ext4_mark_recovery_complete(sb, es);
2041 printk (KERN_INFO "EXT4-fs: mounted filesystem with %s data mode.\n",
2042 test_opt(sb,DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA ? "journal":
2043 test_opt(sb,DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA ? "ordered":
2044 "writeback");
2045
2046 ext4_ext_init(sb);
2047
2048 lock_kernel();
2049 return 0;
2050
2051 cantfind_ext4:
2052 if (!silent)
2053 printk(KERN_ERR "VFS: Can't find ext4 filesystem on dev %s.\n",
2054 sb->s_id);
2055 goto failed_mount;
2056
2057 failed_mount4:
2058 jbd2_journal_destroy(sbi->s_journal);
2059 failed_mount3:
2060 percpu_counter_destroy(&sbi->s_freeblocks_counter);
2061 percpu_counter_destroy(&sbi->s_freeinodes_counter);
2062 percpu_counter_destroy(&sbi->s_dirs_counter);
2063 failed_mount2:
2064 for (i = 0; i < db_count; i++)
2065 brelse(sbi->s_group_desc[i]);
2066 kfree(sbi->s_group_desc);
2067 failed_mount:
2068 #ifdef CONFIG_QUOTA
2069 for (i = 0; i < MAXQUOTAS; i++)
2070 kfree(sbi->s_qf_names[i]);
2071 #endif
2072 ext4_blkdev_remove(sbi);
2073 brelse(bh);
2074 out_fail:
2075 sb->s_fs_info = NULL;
2076 kfree(sbi);
2077 lock_kernel();
2078 return -EINVAL;
2079 }
2080
2081 /*
2082 * Setup any per-fs journal parameters now. We'll do this both on
2083 * initial mount, once the journal has been initialised but before we've
2084 * done any recovery; and again on any subsequent remount.
2085 */
2086 static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
2087 {
2088 struct ext4_sb_info *sbi = EXT4_SB(sb);
2089
2090 if (sbi->s_commit_interval)
2091 journal->j_commit_interval = sbi->s_commit_interval;
2092 /* We could also set up an ext4-specific default for the commit
2093 * interval here, but for now we'll just fall back to the jbd
2094 * default. */
2095
2096 spin_lock(&journal->j_state_lock);
2097 if (test_opt(sb, BARRIER))
2098 journal->j_flags |= JBD2_BARRIER;
2099 else
2100 journal->j_flags &= ~JBD2_BARRIER;
2101 spin_unlock(&journal->j_state_lock);
2102 }
2103
2104 static journal_t *ext4_get_journal(struct super_block *sb,
2105 unsigned int journal_inum)
2106 {
2107 struct inode *journal_inode;
2108 journal_t *journal;
2109
2110 /* First, test for the existence of a valid inode on disk. Bad
2111 * things happen if we iget() an unused inode, as the subsequent
2112 * iput() will try to delete it. */
2113
2114 journal_inode = iget(sb, journal_inum);
2115 if (!journal_inode) {
2116 printk(KERN_ERR "EXT4-fs: no journal found.\n");
2117 return NULL;
2118 }
2119 if (!journal_inode->i_nlink) {
2120 make_bad_inode(journal_inode);
2121 iput(journal_inode);
2122 printk(KERN_ERR "EXT4-fs: journal inode is deleted.\n");
2123 return NULL;
2124 }
2125
2126 jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
2127 journal_inode, journal_inode->i_size);
2128 if (is_bad_inode(journal_inode) || !S_ISREG(journal_inode->i_mode)) {
2129 printk(KERN_ERR "EXT4-fs: invalid journal inode.\n");
2130 iput(journal_inode);
2131 return NULL;
2132 }
2133
2134 journal = jbd2_journal_init_inode(journal_inode);
2135 if (!journal) {
2136 printk(KERN_ERR "EXT4-fs: Could not load journal inode\n");
2137 iput(journal_inode);
2138 return NULL;
2139 }
2140 journal->j_private = sb;
2141 ext4_init_journal_params(sb, journal);
2142 return journal;
2143 }
2144
2145 static journal_t *ext4_get_dev_journal(struct super_block *sb,
2146 dev_t j_dev)
2147 {
2148 struct buffer_head * bh;
2149 journal_t *journal;
2150 ext4_fsblk_t start;
2151 ext4_fsblk_t len;
2152 int hblock, blocksize;
2153 ext4_fsblk_t sb_block;
2154 unsigned long offset;
2155 struct ext4_super_block * es;
2156 struct block_device *bdev;
2157
2158 bdev = ext4_blkdev_get(j_dev);
2159 if (bdev == NULL)
2160 return NULL;
2161
2162 if (bd_claim(bdev, sb)) {
2163 printk(KERN_ERR
2164 "EXT4: failed to claim external journal device.\n");
2165 blkdev_put(bdev);
2166 return NULL;
2167 }
2168
2169 blocksize = sb->s_blocksize;
2170 hblock = bdev_hardsect_size(bdev);
2171 if (blocksize < hblock) {
2172 printk(KERN_ERR
2173 "EXT4-fs: blocksize too small for journal device.\n");
2174 goto out_bdev;
2175 }
2176
2177 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
2178 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
2179 set_blocksize(bdev, blocksize);
2180 if (!(bh = __bread(bdev, sb_block, blocksize))) {
2181 printk(KERN_ERR "EXT4-fs: couldn't read superblock of "
2182 "external journal\n");
2183 goto out_bdev;
2184 }
2185
2186 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
2187 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
2188 !(le32_to_cpu(es->s_feature_incompat) &
2189 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
2190 printk(KERN_ERR "EXT4-fs: external journal has "
2191 "bad superblock\n");
2192 brelse(bh);
2193 goto out_bdev;
2194 }
2195
2196 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
2197 printk(KERN_ERR "EXT4-fs: journal UUID does not match\n");
2198 brelse(bh);
2199 goto out_bdev;
2200 }
2201
2202 len = ext4_blocks_count(es);
2203 start = sb_block + 1;
2204 brelse(bh); /* we're done with the superblock */
2205
2206 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
2207 start, len, blocksize);
2208 if (!journal) {
2209 printk(KERN_ERR "EXT4-fs: failed to create device journal\n");
2210 goto out_bdev;
2211 }
2212 journal->j_private = sb;
2213 ll_rw_block(READ, 1, &journal->j_sb_buffer);
2214 wait_on_buffer(journal->j_sb_buffer);
2215 if (!buffer_uptodate(journal->j_sb_buffer)) {
2216 printk(KERN_ERR "EXT4-fs: I/O error on journal device\n");
2217 goto out_journal;
2218 }
2219 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
2220 printk(KERN_ERR "EXT4-fs: External journal has more than one "
2221 "user (unsupported) - %d\n",
2222 be32_to_cpu(journal->j_superblock->s_nr_users));
2223 goto out_journal;
2224 }
2225 EXT4_SB(sb)->journal_bdev = bdev;
2226 ext4_init_journal_params(sb, journal);
2227 return journal;
2228 out_journal:
2229 jbd2_journal_destroy(journal);
2230 out_bdev:
2231 ext4_blkdev_put(bdev);
2232 return NULL;
2233 }
2234
2235 static int ext4_load_journal(struct super_block *sb,
2236 struct ext4_super_block *es,
2237 unsigned long journal_devnum)
2238 {
2239 journal_t *journal;
2240 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
2241 dev_t journal_dev;
2242 int err = 0;
2243 int really_read_only;
2244
2245 if (journal_devnum &&
2246 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2247 printk(KERN_INFO "EXT4-fs: external journal device major/minor "
2248 "numbers have changed\n");
2249 journal_dev = new_decode_dev(journal_devnum);
2250 } else
2251 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
2252
2253 really_read_only = bdev_read_only(sb->s_bdev);
2254
2255 /*
2256 * Are we loading a blank journal or performing recovery after a
2257 * crash? For recovery, we need to check in advance whether we
2258 * can get read-write access to the device.
2259 */
2260
2261 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
2262 if (sb->s_flags & MS_RDONLY) {
2263 printk(KERN_INFO "EXT4-fs: INFO: recovery "
2264 "required on readonly filesystem.\n");
2265 if (really_read_only) {
2266 printk(KERN_ERR "EXT4-fs: write access "
2267 "unavailable, cannot proceed.\n");
2268 return -EROFS;
2269 }
2270 printk (KERN_INFO "EXT4-fs: write access will "
2271 "be enabled during recovery.\n");
2272 }
2273 }
2274
2275 if (journal_inum && journal_dev) {
2276 printk(KERN_ERR "EXT4-fs: filesystem has both journal "
2277 "and inode journals!\n");
2278 return -EINVAL;
2279 }
2280
2281 if (journal_inum) {
2282 if (!(journal = ext4_get_journal(sb, journal_inum)))
2283 return -EINVAL;
2284 } else {
2285 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
2286 return -EINVAL;
2287 }
2288
2289 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
2290 err = jbd2_journal_update_format(journal);
2291 if (err) {
2292 printk(KERN_ERR "EXT4-fs: error updating journal.\n");
2293 jbd2_journal_destroy(journal);
2294 return err;
2295 }
2296 }
2297
2298 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
2299 err = jbd2_journal_wipe(journal, !really_read_only);
2300 if (!err)
2301 err = jbd2_journal_load(journal);
2302
2303 if (err) {
2304 printk(KERN_ERR "EXT4-fs: error loading journal.\n");
2305 jbd2_journal_destroy(journal);
2306 return err;
2307 }
2308
2309 EXT4_SB(sb)->s_journal = journal;
2310 ext4_clear_journal_err(sb, es);
2311
2312 if (journal_devnum &&
2313 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2314 es->s_journal_dev = cpu_to_le32(journal_devnum);
2315 sb->s_dirt = 1;
2316
2317 /* Make sure we flush the recovery flag to disk. */
2318 ext4_commit_super(sb, es, 1);
2319 }
2320
2321 return 0;
2322 }
2323
2324 static int ext4_create_journal(struct super_block * sb,
2325 struct ext4_super_block * es,
2326 unsigned int journal_inum)
2327 {
2328 journal_t *journal;
2329 int err;
2330
2331 if (sb->s_flags & MS_RDONLY) {
2332 printk(KERN_ERR "EXT4-fs: readonly filesystem when trying to "
2333 "create journal.\n");
2334 return -EROFS;
2335 }
2336
2337 journal = ext4_get_journal(sb, journal_inum);
2338 if (!journal)
2339 return -EINVAL;
2340
2341 printk(KERN_INFO "EXT4-fs: creating new journal on inode %u\n",
2342 journal_inum);
2343
2344 err = jbd2_journal_create(journal);
2345 if (err) {
2346 printk(KERN_ERR "EXT4-fs: error creating journal.\n");
2347 jbd2_journal_destroy(journal);
2348 return -EIO;
2349 }
2350
2351 EXT4_SB(sb)->s_journal = journal;
2352
2353 ext4_update_dynamic_rev(sb);
2354 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2355 EXT4_SET_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL);
2356
2357 es->s_journal_inum = cpu_to_le32(journal_inum);
2358 sb->s_dirt = 1;
2359
2360 /* Make sure we flush the recovery flag to disk. */
2361 ext4_commit_super(sb, es, 1);
2362
2363 return 0;
2364 }
2365
2366 static void ext4_commit_super (struct super_block * sb,
2367 struct ext4_super_block * es,
2368 int sync)
2369 {
2370 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
2371
2372 if (!sbh)
2373 return;
2374 es->s_wtime = cpu_to_le32(get_seconds());
2375 ext4_free_blocks_count_set(es, ext4_count_free_blocks(sb));
2376 es->s_free_inodes_count = cpu_to_le32(ext4_count_free_inodes(sb));
2377 BUFFER_TRACE(sbh, "marking dirty");
2378 mark_buffer_dirty(sbh);
2379 if (sync)
2380 sync_dirty_buffer(sbh);
2381 }
2382
2383
2384 /*
2385 * Have we just finished recovery? If so, and if we are mounting (or
2386 * remounting) the filesystem readonly, then we will end up with a
2387 * consistent fs on disk. Record that fact.
2388 */
2389 static void ext4_mark_recovery_complete(struct super_block * sb,
2390 struct ext4_super_block * es)
2391 {
2392 journal_t *journal = EXT4_SB(sb)->s_journal;
2393
2394 jbd2_journal_lock_updates(journal);
2395 jbd2_journal_flush(journal);
2396 lock_super(sb);
2397 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
2398 sb->s_flags & MS_RDONLY) {
2399 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2400 sb->s_dirt = 0;
2401 ext4_commit_super(sb, es, 1);
2402 }
2403 unlock_super(sb);
2404 jbd2_journal_unlock_updates(journal);
2405 }
2406
2407 /*
2408 * If we are mounting (or read-write remounting) a filesystem whose journal
2409 * has recorded an error from a previous lifetime, move that error to the
2410 * main filesystem now.
2411 */
2412 static void ext4_clear_journal_err(struct super_block * sb,
2413 struct ext4_super_block * es)
2414 {
2415 journal_t *journal;
2416 int j_errno;
2417 const char *errstr;
2418
2419 journal = EXT4_SB(sb)->s_journal;
2420
2421 /*
2422 * Now check for any error status which may have been recorded in the
2423 * journal by a prior ext4_error() or ext4_abort()
2424 */
2425
2426 j_errno = jbd2_journal_errno(journal);
2427 if (j_errno) {
2428 char nbuf[16];
2429
2430 errstr = ext4_decode_error(sb, j_errno, nbuf);
2431 ext4_warning(sb, __FUNCTION__, "Filesystem error recorded "
2432 "from previous mount: %s", errstr);
2433 ext4_warning(sb, __FUNCTION__, "Marking fs in need of "
2434 "filesystem check.");
2435
2436 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
2437 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
2438 ext4_commit_super (sb, es, 1);
2439
2440 jbd2_journal_clear_err(journal);
2441 }
2442 }
2443
2444 /*
2445 * Force the running and committing transactions to commit,
2446 * and wait on the commit.
2447 */
2448 int ext4_force_commit(struct super_block *sb)
2449 {
2450 journal_t *journal;
2451 int ret;
2452
2453 if (sb->s_flags & MS_RDONLY)
2454 return 0;
2455
2456 journal = EXT4_SB(sb)->s_journal;
2457 sb->s_dirt = 0;
2458 ret = ext4_journal_force_commit(journal);
2459 return ret;
2460 }
2461
2462 /*
2463 * Ext4 always journals updates to the superblock itself, so we don't
2464 * have to propagate any other updates to the superblock on disk at this
2465 * point. Just start an async writeback to get the buffers on their way
2466 * to the disk.
2467 *
2468 * This implicitly triggers the writebehind on sync().
2469 */
2470
2471 static void ext4_write_super (struct super_block * sb)
2472 {
2473 if (mutex_trylock(&sb->s_lock) != 0)
2474 BUG();
2475 sb->s_dirt = 0;
2476 }
2477
2478 static int ext4_sync_fs(struct super_block *sb, int wait)
2479 {
2480 tid_t target;
2481
2482 sb->s_dirt = 0;
2483 if (jbd2_journal_start_commit(EXT4_SB(sb)->s_journal, &target)) {
2484 if (wait)
2485 jbd2_log_wait_commit(EXT4_SB(sb)->s_journal, target);
2486 }
2487 return 0;
2488 }
2489
2490 /*
2491 * LVM calls this function before a (read-only) snapshot is created. This
2492 * gives us a chance to flush the journal completely and mark the fs clean.
2493 */
2494 static void ext4_write_super_lockfs(struct super_block *sb)
2495 {
2496 sb->s_dirt = 0;
2497
2498 if (!(sb->s_flags & MS_RDONLY)) {
2499 journal_t *journal = EXT4_SB(sb)->s_journal;
2500
2501 /* Now we set up the journal barrier. */
2502 jbd2_journal_lock_updates(journal);
2503 jbd2_journal_flush(journal);
2504
2505 /* Journal blocked and flushed, clear needs_recovery flag. */
2506 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2507 ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1);
2508 }
2509 }
2510
2511 /*
2512 * Called by LVM after the snapshot is done. We need to reset the RECOVER
2513 * flag here, even though the filesystem is not technically dirty yet.
2514 */
2515 static void ext4_unlockfs(struct super_block *sb)
2516 {
2517 if (!(sb->s_flags & MS_RDONLY)) {
2518 lock_super(sb);
2519 /* Reser the needs_recovery flag before the fs is unlocked. */
2520 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2521 ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1);
2522 unlock_super(sb);
2523 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
2524 }
2525 }
2526
2527 static int ext4_remount (struct super_block * sb, int * flags, char * data)
2528 {
2529 struct ext4_super_block * es;
2530 struct ext4_sb_info *sbi = EXT4_SB(sb);
2531 ext4_fsblk_t n_blocks_count = 0;
2532 unsigned long old_sb_flags;
2533 struct ext4_mount_options old_opts;
2534 int err;
2535 #ifdef CONFIG_QUOTA
2536 int i;
2537 #endif
2538
2539 /* Store the original options */
2540 old_sb_flags = sb->s_flags;
2541 old_opts.s_mount_opt = sbi->s_mount_opt;
2542 old_opts.s_resuid = sbi->s_resuid;
2543 old_opts.s_resgid = sbi->s_resgid;
2544 old_opts.s_commit_interval = sbi->s_commit_interval;
2545 #ifdef CONFIG_QUOTA
2546 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
2547 for (i = 0; i < MAXQUOTAS; i++)
2548 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
2549 #endif
2550
2551 /*
2552 * Allow the "check" option to be passed as a remount option.
2553 */
2554 if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
2555 err = -EINVAL;
2556 goto restore_opts;
2557 }
2558
2559 if (sbi->s_mount_opt & EXT4_MOUNT_ABORT)
2560 ext4_abort(sb, __FUNCTION__, "Abort forced by user");
2561
2562 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
2563 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
2564
2565 es = sbi->s_es;
2566
2567 ext4_init_journal_params(sb, sbi->s_journal);
2568
2569 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
2570 n_blocks_count > ext4_blocks_count(es)) {
2571 if (sbi->s_mount_opt & EXT4_MOUNT_ABORT) {
2572 err = -EROFS;
2573 goto restore_opts;
2574 }
2575
2576 if (*flags & MS_RDONLY) {
2577 /*
2578 * First of all, the unconditional stuff we have to do
2579 * to disable replay of the journal when we next remount
2580 */
2581 sb->s_flags |= MS_RDONLY;
2582
2583 /*
2584 * OK, test if we are remounting a valid rw partition
2585 * readonly, and if so set the rdonly flag and then
2586 * mark the partition as valid again.
2587 */
2588 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
2589 (sbi->s_mount_state & EXT4_VALID_FS))
2590 es->s_state = cpu_to_le16(sbi->s_mount_state);
2591
2592 /*
2593 * We have to unlock super so that we can wait for
2594 * transactions.
2595 */
2596 unlock_super(sb);
2597 ext4_mark_recovery_complete(sb, es);
2598 lock_super(sb);
2599 } else {
2600 __le32 ret;
2601 if ((ret = EXT4_HAS_RO_COMPAT_FEATURE(sb,
2602 ~EXT4_FEATURE_RO_COMPAT_SUPP))) {
2603 printk(KERN_WARNING "EXT4-fs: %s: couldn't "
2604 "remount RDWR because of unsupported "
2605 "optional features (%x).\n",
2606 sb->s_id, le32_to_cpu(ret));
2607 err = -EROFS;
2608 goto restore_opts;
2609 }
2610
2611 /*
2612 * If we have an unprocessed orphan list hanging
2613 * around from a previously readonly bdev mount,
2614 * require a full umount/remount for now.
2615 */
2616 if (es->s_last_orphan) {
2617 printk(KERN_WARNING "EXT4-fs: %s: couldn't "
2618 "remount RDWR because of unprocessed "
2619 "orphan inode list. Please "
2620 "umount/remount instead.\n",
2621 sb->s_id);
2622 err = -EINVAL;
2623 goto restore_opts;
2624 }
2625
2626 /*
2627 * Mounting a RDONLY partition read-write, so reread
2628 * and store the current valid flag. (It may have
2629 * been changed by e2fsck since we originally mounted
2630 * the partition.)
2631 */
2632 ext4_clear_journal_err(sb, es);
2633 sbi->s_mount_state = le16_to_cpu(es->s_state);
2634 if ((err = ext4_group_extend(sb, es, n_blocks_count)))
2635 goto restore_opts;
2636 if (!ext4_setup_super (sb, es, 0))
2637 sb->s_flags &= ~MS_RDONLY;
2638 }
2639 }
2640 #ifdef CONFIG_QUOTA
2641 /* Release old quota file names */
2642 for (i = 0; i < MAXQUOTAS; i++)
2643 if (old_opts.s_qf_names[i] &&
2644 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2645 kfree(old_opts.s_qf_names[i]);
2646 #endif
2647 return 0;
2648 restore_opts:
2649 sb->s_flags = old_sb_flags;
2650 sbi->s_mount_opt = old_opts.s_mount_opt;
2651 sbi->s_resuid = old_opts.s_resuid;
2652 sbi->s_resgid = old_opts.s_resgid;
2653 sbi->s_commit_interval = old_opts.s_commit_interval;
2654 #ifdef CONFIG_QUOTA
2655 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
2656 for (i = 0; i < MAXQUOTAS; i++) {
2657 if (sbi->s_qf_names[i] &&
2658 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2659 kfree(sbi->s_qf_names[i]);
2660 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
2661 }
2662 #endif
2663 return err;
2664 }
2665
2666 static int ext4_statfs (struct dentry * dentry, struct kstatfs * buf)
2667 {
2668 struct super_block *sb = dentry->d_sb;
2669 struct ext4_sb_info *sbi = EXT4_SB(sb);
2670 struct ext4_super_block *es = sbi->s_es;
2671 u64 fsid;
2672
2673 if (test_opt(sb, MINIX_DF)) {
2674 sbi->s_overhead_last = 0;
2675 } else if (sbi->s_blocks_last != ext4_blocks_count(es)) {
2676 unsigned long ngroups = sbi->s_groups_count, i;
2677 ext4_fsblk_t overhead = 0;
2678 smp_rmb();
2679
2680 /*
2681 * Compute the overhead (FS structures). This is constant
2682 * for a given filesystem unless the number of block groups
2683 * changes so we cache the previous value until it does.
2684 */
2685
2686 /*
2687 * All of the blocks before first_data_block are
2688 * overhead
2689 */
2690 overhead = le32_to_cpu(es->s_first_data_block);
2691
2692 /*
2693 * Add the overhead attributed to the superblock and
2694 * block group descriptors. If the sparse superblocks
2695 * feature is turned on, then not all groups have this.
2696 */
2697 for (i = 0; i < ngroups; i++) {
2698 overhead += ext4_bg_has_super(sb, i) +
2699 ext4_bg_num_gdb(sb, i);
2700 cond_resched();
2701 }
2702
2703 /*
2704 * Every block group has an inode bitmap, a block
2705 * bitmap, and an inode table.
2706 */
2707 overhead += ngroups * (2 + sbi->s_itb_per_group);
2708 sbi->s_overhead_last = overhead;
2709 smp_wmb();
2710 sbi->s_blocks_last = ext4_blocks_count(es);
2711 }
2712
2713 buf->f_type = EXT4_SUPER_MAGIC;
2714 buf->f_bsize = sb->s_blocksize;
2715 buf->f_blocks = ext4_blocks_count(es) - sbi->s_overhead_last;
2716 buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter);
2717 ext4_free_blocks_count_set(es, buf->f_bfree);
2718 buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es);
2719 if (buf->f_bfree < ext4_r_blocks_count(es))
2720 buf->f_bavail = 0;
2721 buf->f_files = le32_to_cpu(es->s_inodes_count);
2722 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
2723 es->s_free_inodes_count = cpu_to_le32(buf->f_ffree);
2724 buf->f_namelen = EXT4_NAME_LEN;
2725 fsid = le64_to_cpup((void *)es->s_uuid) ^
2726 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
2727 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
2728 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
2729 return 0;
2730 }
2731
2732 /* Helper function for writing quotas on sync - we need to start transaction before quota file
2733 * is locked for write. Otherwise the are possible deadlocks:
2734 * Process 1 Process 2
2735 * ext4_create() quota_sync()
2736 * jbd2_journal_start() write_dquot()
2737 * DQUOT_INIT() down(dqio_mutex)
2738 * down(dqio_mutex) jbd2_journal_start()
2739 *
2740 */
2741
2742 #ifdef CONFIG_QUOTA
2743
2744 static inline struct inode *dquot_to_inode(struct dquot *dquot)
2745 {
2746 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
2747 }
2748
2749 static int ext4_dquot_initialize(struct inode *inode, int type)
2750 {
2751 handle_t *handle;
2752 int ret, err;
2753
2754 /* We may create quota structure so we need to reserve enough blocks */
2755 handle = ext4_journal_start(inode, 2*EXT4_QUOTA_INIT_BLOCKS(inode->i_sb));
2756 if (IS_ERR(handle))
2757 return PTR_ERR(handle);
2758 ret = dquot_initialize(inode, type);
2759 err = ext4_journal_stop(handle);
2760 if (!ret)
2761 ret = err;
2762 return ret;
2763 }
2764
2765 static int ext4_dquot_drop(struct inode *inode)
2766 {
2767 handle_t *handle;
2768 int ret, err;
2769
2770 /* We may delete quota structure so we need to reserve enough blocks */
2771 handle = ext4_journal_start(inode, 2*EXT4_QUOTA_DEL_BLOCKS(inode->i_sb));
2772 if (IS_ERR(handle))
2773 return PTR_ERR(handle);
2774 ret = dquot_drop(inode);
2775 err = ext4_journal_stop(handle);
2776 if (!ret)
2777 ret = err;
2778 return ret;
2779 }
2780
2781 static int ext4_write_dquot(struct dquot *dquot)
2782 {
2783 int ret, err;
2784 handle_t *handle;
2785 struct inode *inode;
2786
2787 inode = dquot_to_inode(dquot);
2788 handle = ext4_journal_start(inode,
2789 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2790 if (IS_ERR(handle))
2791 return PTR_ERR(handle);
2792 ret = dquot_commit(dquot);
2793 err = ext4_journal_stop(handle);
2794 if (!ret)
2795 ret = err;
2796 return ret;
2797 }
2798
2799 static int ext4_acquire_dquot(struct dquot *dquot)
2800 {
2801 int ret, err;
2802 handle_t *handle;
2803
2804 handle = ext4_journal_start(dquot_to_inode(dquot),
2805 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2806 if (IS_ERR(handle))
2807 return PTR_ERR(handle);
2808 ret = dquot_acquire(dquot);
2809 err = ext4_journal_stop(handle);
2810 if (!ret)
2811 ret = err;
2812 return ret;
2813 }
2814
2815 static int ext4_release_dquot(struct dquot *dquot)
2816 {
2817 int ret, err;
2818 handle_t *handle;
2819
2820 handle = ext4_journal_start(dquot_to_inode(dquot),
2821 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2822 if (IS_ERR(handle)) {
2823 /* Release dquot anyway to avoid endless cycle in dqput() */
2824 dquot_release(dquot);
2825 return PTR_ERR(handle);
2826 }
2827 ret = dquot_release(dquot);
2828 err = ext4_journal_stop(handle);
2829 if (!ret)
2830 ret = err;
2831 return ret;
2832 }
2833
2834 static int ext4_mark_dquot_dirty(struct dquot *dquot)
2835 {
2836 /* Are we journalling quotas? */
2837 if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2838 EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2839 dquot_mark_dquot_dirty(dquot);
2840 return ext4_write_dquot(dquot);
2841 } else {
2842 return dquot_mark_dquot_dirty(dquot);
2843 }
2844 }
2845
2846 static int ext4_write_info(struct super_block *sb, int type)
2847 {
2848 int ret, err;
2849 handle_t *handle;
2850
2851 /* Data block + inode block */
2852 handle = ext4_journal_start(sb->s_root->d_inode, 2);
2853 if (IS_ERR(handle))
2854 return PTR_ERR(handle);
2855 ret = dquot_commit_info(sb, type);
2856 err = ext4_journal_stop(handle);
2857 if (!ret)
2858 ret = err;
2859 return ret;
2860 }
2861
2862 /*
2863 * Turn on quotas during mount time - we need to find
2864 * the quota file and such...
2865 */
2866 static int ext4_quota_on_mount(struct super_block *sb, int type)
2867 {
2868 return vfs_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
2869 EXT4_SB(sb)->s_jquota_fmt, type);
2870 }
2871
2872 /*
2873 * Standard function to be called on quota_on
2874 */
2875 static int ext4_quota_on(struct super_block *sb, int type, int format_id,
2876 char *path)
2877 {
2878 int err;
2879 struct nameidata nd;
2880
2881 if (!test_opt(sb, QUOTA))
2882 return -EINVAL;
2883 /* Not journalling quota? */
2884 if (!EXT4_SB(sb)->s_qf_names[USRQUOTA] &&
2885 !EXT4_SB(sb)->s_qf_names[GRPQUOTA])
2886 return vfs_quota_on(sb, type, format_id, path);
2887 err = path_lookup(path, LOOKUP_FOLLOW, &nd);
2888 if (err)
2889 return err;
2890 /* Quotafile not on the same filesystem? */
2891 if (nd.mnt->mnt_sb != sb) {
2892 path_release(&nd);
2893 return -EXDEV;
2894 }
2895 /* Quotafile not of fs root? */
2896 if (nd.dentry->d_parent->d_inode != sb->s_root->d_inode)
2897 printk(KERN_WARNING
2898 "EXT4-fs: Quota file not on filesystem root. "
2899 "Journalled quota will not work.\n");
2900 path_release(&nd);
2901 return vfs_quota_on(sb, type, format_id, path);
2902 }
2903
2904 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2905 * acquiring the locks... As quota files are never truncated and quota code
2906 * itself serializes the operations (and noone else should touch the files)
2907 * we don't have to be afraid of races */
2908 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
2909 size_t len, loff_t off)
2910 {
2911 struct inode *inode = sb_dqopt(sb)->files[type];
2912 sector_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
2913 int err = 0;
2914 int offset = off & (sb->s_blocksize - 1);
2915 int tocopy;
2916 size_t toread;
2917 struct buffer_head *bh;
2918 loff_t i_size = i_size_read(inode);
2919
2920 if (off > i_size)
2921 return 0;
2922 if (off+len > i_size)
2923 len = i_size-off;
2924 toread = len;
2925 while (toread > 0) {
2926 tocopy = sb->s_blocksize - offset < toread ?
2927 sb->s_blocksize - offset : toread;
2928 bh = ext4_bread(NULL, inode, blk, 0, &err);
2929 if (err)
2930 return err;
2931 if (!bh) /* A hole? */
2932 memset(data, 0, tocopy);
2933 else
2934 memcpy(data, bh->b_data+offset, tocopy);
2935 brelse(bh);
2936 offset = 0;
2937 toread -= tocopy;
2938 data += tocopy;
2939 blk++;
2940 }
2941 return len;
2942 }
2943
2944 /* Write to quotafile (we know the transaction is already started and has
2945 * enough credits) */
2946 static ssize_t ext4_quota_write(struct super_block *sb, int type,
2947 const char *data, size_t len, loff_t off)
2948 {
2949 struct inode *inode = sb_dqopt(sb)->files[type];
2950 sector_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
2951 int err = 0;
2952 int offset = off & (sb->s_blocksize - 1);
2953 int tocopy;
2954 int journal_quota = EXT4_SB(sb)->s_qf_names[type] != NULL;
2955 size_t towrite = len;
2956 struct buffer_head *bh;
2957 handle_t *handle = journal_current_handle();
2958
2959 if (!handle) {
2960 printk(KERN_WARNING "EXT4-fs: Quota write (off=%Lu, len=%Lu)"
2961 " cancelled because transaction is not started.\n",
2962 (unsigned long long)off, (unsigned long long)len);
2963 return -EIO;
2964 }
2965 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
2966 while (towrite > 0) {
2967 tocopy = sb->s_blocksize - offset < towrite ?
2968 sb->s_blocksize - offset : towrite;
2969 bh = ext4_bread(handle, inode, blk, 1, &err);
2970 if (!bh)
2971 goto out;
2972 if (journal_quota) {
2973 err = ext4_journal_get_write_access(handle, bh);
2974 if (err) {
2975 brelse(bh);
2976 goto out;
2977 }
2978 }
2979 lock_buffer(bh);
2980 memcpy(bh->b_data+offset, data, tocopy);
2981 flush_dcache_page(bh->b_page);
2982 unlock_buffer(bh);
2983 if (journal_quota)
2984 err = ext4_journal_dirty_metadata(handle, bh);
2985 else {
2986 /* Always do at least ordered writes for quotas */
2987 err = ext4_journal_dirty_data(handle, bh);
2988 mark_buffer_dirty(bh);
2989 }
2990 brelse(bh);
2991 if (err)
2992 goto out;
2993 offset = 0;
2994 towrite -= tocopy;
2995 data += tocopy;
2996 blk++;
2997 }
2998 out:
2999 if (len == towrite)
3000 return err;
3001 if (inode->i_size < off+len-towrite) {
3002 i_size_write(inode, off+len-towrite);
3003 EXT4_I(inode)->i_disksize = inode->i_size;
3004 }
3005 inode->i_version++;
3006 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
3007 ext4_mark_inode_dirty(handle, inode);
3008 mutex_unlock(&inode->i_mutex);
3009 return len - towrite;
3010 }
3011
3012 #endif
3013
3014 static int ext4_get_sb(struct file_system_type *fs_type,
3015 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
3016 {
3017 return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super, mnt);
3018 }
3019
3020 static struct file_system_type ext4dev_fs_type = {
3021 .owner = THIS_MODULE,
3022 .name = "ext4dev",
3023 .get_sb = ext4_get_sb,
3024 .kill_sb = kill_block_super,
3025 .fs_flags = FS_REQUIRES_DEV,
3026 };
3027
3028 static int __init init_ext4_fs(void)
3029 {
3030 int err = init_ext4_xattr();
3031 if (err)
3032 return err;
3033 err = init_inodecache();
3034 if (err)
3035 goto out1;
3036 err = register_filesystem(&ext4dev_fs_type);
3037 if (err)
3038 goto out;
3039 return 0;
3040 out:
3041 destroy_inodecache();
3042 out1:
3043 exit_ext4_xattr();
3044 return err;
3045 }
3046
3047 static void __exit exit_ext4_fs(void)
3048 {
3049 unregister_filesystem(&ext4dev_fs_type);
3050 destroy_inodecache();
3051 exit_ext4_xattr();
3052 }
3053
3054 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
3055 MODULE_DESCRIPTION("Fourth Extended Filesystem with extents");
3056 MODULE_LICENSE("GPL");
3057 module_init(init_ext4_fs)
3058 module_exit(exit_ext4_fs)
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