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[PATCH] VFS: Permit filesystem to perform statfs with a known root dentry
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / fs / ext3 / super.c
1 /*
2 * linux/fs/ext3/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/config.h>
20 #include <linux/module.h>
21 #include <linux/string.h>
22 #include <linux/fs.h>
23 #include <linux/time.h>
24 #include <linux/jbd.h>
25 #include <linux/ext3_fs.h>
26 #include <linux/ext3_jbd.h>
27 #include <linux/slab.h>
28 #include <linux/init.h>
29 #include <linux/blkdev.h>
30 #include <linux/parser.h>
31 #include <linux/smp_lock.h>
32 #include <linux/buffer_head.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
40 #include <asm/uaccess.h>
41
42 #include "xattr.h"
43 #include "acl.h"
44 #include "namei.h"
45
46 static int ext3_load_journal(struct super_block *, struct ext3_super_block *,
47 unsigned long journal_devnum);
48 static int ext3_create_journal(struct super_block *, struct ext3_super_block *,
49 int);
50 static void ext3_commit_super (struct super_block * sb,
51 struct ext3_super_block * es,
52 int sync);
53 static void ext3_mark_recovery_complete(struct super_block * sb,
54 struct ext3_super_block * es);
55 static void ext3_clear_journal_err(struct super_block * sb,
56 struct ext3_super_block * es);
57 static int ext3_sync_fs(struct super_block *sb, int wait);
58 static const char *ext3_decode_error(struct super_block * sb, int errno,
59 char nbuf[16]);
60 static int ext3_remount (struct super_block * sb, int * flags, char * data);
61 static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf);
62 static void ext3_unlockfs(struct super_block *sb);
63 static void ext3_write_super (struct super_block * sb);
64 static void ext3_write_super_lockfs(struct super_block *sb);
65
66 /*
67 * Wrappers for journal_start/end.
68 *
69 * The only special thing we need to do here is to make sure that all
70 * journal_end calls result in the superblock being marked dirty, so
71 * that sync() will call the filesystem's write_super callback if
72 * appropriate.
73 */
74 handle_t *ext3_journal_start_sb(struct super_block *sb, int nblocks)
75 {
76 journal_t *journal;
77
78 if (sb->s_flags & MS_RDONLY)
79 return ERR_PTR(-EROFS);
80
81 /* Special case here: if the journal has aborted behind our
82 * backs (eg. EIO in the commit thread), then we still need to
83 * take the FS itself readonly cleanly. */
84 journal = EXT3_SB(sb)->s_journal;
85 if (is_journal_aborted(journal)) {
86 ext3_abort(sb, __FUNCTION__,
87 "Detected aborted journal");
88 return ERR_PTR(-EROFS);
89 }
90
91 return journal_start(journal, nblocks);
92 }
93
94 /*
95 * The only special thing we need to do here is to make sure that all
96 * journal_stop calls result in the superblock being marked dirty, so
97 * that sync() will call the filesystem's write_super callback if
98 * appropriate.
99 */
100 int __ext3_journal_stop(const char *where, handle_t *handle)
101 {
102 struct super_block *sb;
103 int err;
104 int rc;
105
106 sb = handle->h_transaction->t_journal->j_private;
107 err = handle->h_err;
108 rc = journal_stop(handle);
109
110 if (!err)
111 err = rc;
112 if (err)
113 __ext3_std_error(sb, where, err);
114 return err;
115 }
116
117 void ext3_journal_abort_handle(const char *caller, const char *err_fn,
118 struct buffer_head *bh, handle_t *handle, int err)
119 {
120 char nbuf[16];
121 const char *errstr = ext3_decode_error(NULL, err, nbuf);
122
123 if (bh)
124 BUFFER_TRACE(bh, "abort");
125
126 if (!handle->h_err)
127 handle->h_err = err;
128
129 if (is_handle_aborted(handle))
130 return;
131
132 printk(KERN_ERR "%s: aborting transaction: %s in %s\n",
133 caller, errstr, err_fn);
134
135 journal_abort_handle(handle);
136 }
137
138 /* Deal with the reporting of failure conditions on a filesystem such as
139 * inconsistencies detected or read IO failures.
140 *
141 * On ext2, we can store the error state of the filesystem in the
142 * superblock. That is not possible on ext3, because we may have other
143 * write ordering constraints on the superblock which prevent us from
144 * writing it out straight away; and given that the journal is about to
145 * be aborted, we can't rely on the current, or future, transactions to
146 * write out the superblock safely.
147 *
148 * We'll just use the journal_abort() error code to record an error in
149 * the journal instead. On recovery, the journal will compain about
150 * that error until we've noted it down and cleared it.
151 */
152
153 static void ext3_handle_error(struct super_block *sb)
154 {
155 struct ext3_super_block *es = EXT3_SB(sb)->s_es;
156
157 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
158 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
159
160 if (sb->s_flags & MS_RDONLY)
161 return;
162
163 if (test_opt (sb, ERRORS_RO)) {
164 printk (KERN_CRIT "Remounting filesystem read-only\n");
165 sb->s_flags |= MS_RDONLY;
166 } else {
167 journal_t *journal = EXT3_SB(sb)->s_journal;
168
169 EXT3_SB(sb)->s_mount_opt |= EXT3_MOUNT_ABORT;
170 if (journal)
171 journal_abort(journal, -EIO);
172 }
173 if (test_opt(sb, ERRORS_PANIC))
174 panic("EXT3-fs (device %s): panic forced after error\n",
175 sb->s_id);
176 ext3_commit_super(sb, es, 1);
177 }
178
179 void ext3_error (struct super_block * sb, const char * function,
180 const char * fmt, ...)
181 {
182 va_list args;
183
184 va_start(args, fmt);
185 printk(KERN_CRIT "EXT3-fs error (device %s): %s: ",sb->s_id, function);
186 vprintk(fmt, args);
187 printk("\n");
188 va_end(args);
189
190 ext3_handle_error(sb);
191 }
192
193 static const char *ext3_decode_error(struct super_block * sb, int errno,
194 char nbuf[16])
195 {
196 char *errstr = NULL;
197
198 switch (errno) {
199 case -EIO:
200 errstr = "IO failure";
201 break;
202 case -ENOMEM:
203 errstr = "Out of memory";
204 break;
205 case -EROFS:
206 if (!sb || EXT3_SB(sb)->s_journal->j_flags & JFS_ABORT)
207 errstr = "Journal has aborted";
208 else
209 errstr = "Readonly filesystem";
210 break;
211 default:
212 /* If the caller passed in an extra buffer for unknown
213 * errors, textualise them now. Else we just return
214 * NULL. */
215 if (nbuf) {
216 /* Check for truncated error codes... */
217 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
218 errstr = nbuf;
219 }
220 break;
221 }
222
223 return errstr;
224 }
225
226 /* __ext3_std_error decodes expected errors from journaling functions
227 * automatically and invokes the appropriate error response. */
228
229 void __ext3_std_error (struct super_block * sb, const char * function,
230 int errno)
231 {
232 char nbuf[16];
233 const char *errstr;
234
235 /* Special case: if the error is EROFS, and we're not already
236 * inside a transaction, then there's really no point in logging
237 * an error. */
238 if (errno == -EROFS && journal_current_handle() == NULL &&
239 (sb->s_flags & MS_RDONLY))
240 return;
241
242 errstr = ext3_decode_error(sb, errno, nbuf);
243 printk (KERN_CRIT "EXT3-fs error (device %s) in %s: %s\n",
244 sb->s_id, function, errstr);
245
246 ext3_handle_error(sb);
247 }
248
249 /*
250 * ext3_abort is a much stronger failure handler than ext3_error. The
251 * abort function may be used to deal with unrecoverable failures such
252 * as journal IO errors or ENOMEM at a critical moment in log management.
253 *
254 * We unconditionally force the filesystem into an ABORT|READONLY state,
255 * unless the error response on the fs has been set to panic in which
256 * case we take the easy way out and panic immediately.
257 */
258
259 void ext3_abort (struct super_block * sb, const char * function,
260 const char * fmt, ...)
261 {
262 va_list args;
263
264 printk (KERN_CRIT "ext3_abort called.\n");
265
266 va_start(args, fmt);
267 printk(KERN_CRIT "EXT3-fs error (device %s): %s: ",sb->s_id, function);
268 vprintk(fmt, args);
269 printk("\n");
270 va_end(args);
271
272 if (test_opt(sb, ERRORS_PANIC))
273 panic("EXT3-fs panic from previous error\n");
274
275 if (sb->s_flags & MS_RDONLY)
276 return;
277
278 printk(KERN_CRIT "Remounting filesystem read-only\n");
279 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
280 sb->s_flags |= MS_RDONLY;
281 EXT3_SB(sb)->s_mount_opt |= EXT3_MOUNT_ABORT;
282 journal_abort(EXT3_SB(sb)->s_journal, -EIO);
283 }
284
285 void ext3_warning (struct super_block * sb, const char * function,
286 const char * fmt, ...)
287 {
288 va_list args;
289
290 va_start(args, fmt);
291 printk(KERN_WARNING "EXT3-fs warning (device %s): %s: ",
292 sb->s_id, function);
293 vprintk(fmt, args);
294 printk("\n");
295 va_end(args);
296 }
297
298 void ext3_update_dynamic_rev(struct super_block *sb)
299 {
300 struct ext3_super_block *es = EXT3_SB(sb)->s_es;
301
302 if (le32_to_cpu(es->s_rev_level) > EXT3_GOOD_OLD_REV)
303 return;
304
305 ext3_warning(sb, __FUNCTION__,
306 "updating to rev %d because of new feature flag, "
307 "running e2fsck is recommended",
308 EXT3_DYNAMIC_REV);
309
310 es->s_first_ino = cpu_to_le32(EXT3_GOOD_OLD_FIRST_INO);
311 es->s_inode_size = cpu_to_le16(EXT3_GOOD_OLD_INODE_SIZE);
312 es->s_rev_level = cpu_to_le32(EXT3_DYNAMIC_REV);
313 /* leave es->s_feature_*compat flags alone */
314 /* es->s_uuid will be set by e2fsck if empty */
315
316 /*
317 * The rest of the superblock fields should be zero, and if not it
318 * means they are likely already in use, so leave them alone. We
319 * can leave it up to e2fsck to clean up any inconsistencies there.
320 */
321 }
322
323 /*
324 * Open the external journal device
325 */
326 static struct block_device *ext3_blkdev_get(dev_t dev)
327 {
328 struct block_device *bdev;
329 char b[BDEVNAME_SIZE];
330
331 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
332 if (IS_ERR(bdev))
333 goto fail;
334 return bdev;
335
336 fail:
337 printk(KERN_ERR "EXT3: failed to open journal device %s: %ld\n",
338 __bdevname(dev, b), PTR_ERR(bdev));
339 return NULL;
340 }
341
342 /*
343 * Release the journal device
344 */
345 static int ext3_blkdev_put(struct block_device *bdev)
346 {
347 bd_release(bdev);
348 return blkdev_put(bdev);
349 }
350
351 static int ext3_blkdev_remove(struct ext3_sb_info *sbi)
352 {
353 struct block_device *bdev;
354 int ret = -ENODEV;
355
356 bdev = sbi->journal_bdev;
357 if (bdev) {
358 ret = ext3_blkdev_put(bdev);
359 sbi->journal_bdev = NULL;
360 }
361 return ret;
362 }
363
364 static inline struct inode *orphan_list_entry(struct list_head *l)
365 {
366 return &list_entry(l, struct ext3_inode_info, i_orphan)->vfs_inode;
367 }
368
369 static void dump_orphan_list(struct super_block *sb, struct ext3_sb_info *sbi)
370 {
371 struct list_head *l;
372
373 printk(KERN_ERR "sb orphan head is %d\n",
374 le32_to_cpu(sbi->s_es->s_last_orphan));
375
376 printk(KERN_ERR "sb_info orphan list:\n");
377 list_for_each(l, &sbi->s_orphan) {
378 struct inode *inode = orphan_list_entry(l);
379 printk(KERN_ERR " "
380 "inode %s:%ld at %p: mode %o, nlink %d, next %d\n",
381 inode->i_sb->s_id, inode->i_ino, inode,
382 inode->i_mode, inode->i_nlink,
383 NEXT_ORPHAN(inode));
384 }
385 }
386
387 static void ext3_put_super (struct super_block * sb)
388 {
389 struct ext3_sb_info *sbi = EXT3_SB(sb);
390 struct ext3_super_block *es = sbi->s_es;
391 int i;
392
393 ext3_xattr_put_super(sb);
394 journal_destroy(sbi->s_journal);
395 if (!(sb->s_flags & MS_RDONLY)) {
396 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
397 es->s_state = cpu_to_le16(sbi->s_mount_state);
398 BUFFER_TRACE(sbi->s_sbh, "marking dirty");
399 mark_buffer_dirty(sbi->s_sbh);
400 ext3_commit_super(sb, es, 1);
401 }
402
403 for (i = 0; i < sbi->s_gdb_count; i++)
404 brelse(sbi->s_group_desc[i]);
405 kfree(sbi->s_group_desc);
406 percpu_counter_destroy(&sbi->s_freeblocks_counter);
407 percpu_counter_destroy(&sbi->s_freeinodes_counter);
408 percpu_counter_destroy(&sbi->s_dirs_counter);
409 brelse(sbi->s_sbh);
410 #ifdef CONFIG_QUOTA
411 for (i = 0; i < MAXQUOTAS; i++)
412 kfree(sbi->s_qf_names[i]);
413 #endif
414
415 /* Debugging code just in case the in-memory inode orphan list
416 * isn't empty. The on-disk one can be non-empty if we've
417 * detected an error and taken the fs readonly, but the
418 * in-memory list had better be clean by this point. */
419 if (!list_empty(&sbi->s_orphan))
420 dump_orphan_list(sb, sbi);
421 J_ASSERT(list_empty(&sbi->s_orphan));
422
423 invalidate_bdev(sb->s_bdev, 0);
424 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
425 /*
426 * Invalidate the journal device's buffers. We don't want them
427 * floating about in memory - the physical journal device may
428 * hotswapped, and it breaks the `ro-after' testing code.
429 */
430 sync_blockdev(sbi->journal_bdev);
431 invalidate_bdev(sbi->journal_bdev, 0);
432 ext3_blkdev_remove(sbi);
433 }
434 sb->s_fs_info = NULL;
435 kfree(sbi);
436 return;
437 }
438
439 static kmem_cache_t *ext3_inode_cachep;
440
441 /*
442 * Called inside transaction, so use GFP_NOFS
443 */
444 static struct inode *ext3_alloc_inode(struct super_block *sb)
445 {
446 struct ext3_inode_info *ei;
447
448 ei = kmem_cache_alloc(ext3_inode_cachep, SLAB_NOFS);
449 if (!ei)
450 return NULL;
451 #ifdef CONFIG_EXT3_FS_POSIX_ACL
452 ei->i_acl = EXT3_ACL_NOT_CACHED;
453 ei->i_default_acl = EXT3_ACL_NOT_CACHED;
454 #endif
455 ei->i_block_alloc_info = NULL;
456 ei->vfs_inode.i_version = 1;
457 return &ei->vfs_inode;
458 }
459
460 static void ext3_destroy_inode(struct inode *inode)
461 {
462 kmem_cache_free(ext3_inode_cachep, EXT3_I(inode));
463 }
464
465 static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
466 {
467 struct ext3_inode_info *ei = (struct ext3_inode_info *) foo;
468
469 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
470 SLAB_CTOR_CONSTRUCTOR) {
471 INIT_LIST_HEAD(&ei->i_orphan);
472 #ifdef CONFIG_EXT3_FS_XATTR
473 init_rwsem(&ei->xattr_sem);
474 #endif
475 mutex_init(&ei->truncate_mutex);
476 inode_init_once(&ei->vfs_inode);
477 }
478 }
479
480 static int init_inodecache(void)
481 {
482 ext3_inode_cachep = kmem_cache_create("ext3_inode_cache",
483 sizeof(struct ext3_inode_info),
484 0, (SLAB_RECLAIM_ACCOUNT|
485 SLAB_MEM_SPREAD),
486 init_once, NULL);
487 if (ext3_inode_cachep == NULL)
488 return -ENOMEM;
489 return 0;
490 }
491
492 static void destroy_inodecache(void)
493 {
494 if (kmem_cache_destroy(ext3_inode_cachep))
495 printk(KERN_INFO "ext3_inode_cache: not all structures were freed\n");
496 }
497
498 static void ext3_clear_inode(struct inode *inode)
499 {
500 struct ext3_block_alloc_info *rsv = EXT3_I(inode)->i_block_alloc_info;
501 #ifdef CONFIG_EXT3_FS_POSIX_ACL
502 if (EXT3_I(inode)->i_acl &&
503 EXT3_I(inode)->i_acl != EXT3_ACL_NOT_CACHED) {
504 posix_acl_release(EXT3_I(inode)->i_acl);
505 EXT3_I(inode)->i_acl = EXT3_ACL_NOT_CACHED;
506 }
507 if (EXT3_I(inode)->i_default_acl &&
508 EXT3_I(inode)->i_default_acl != EXT3_ACL_NOT_CACHED) {
509 posix_acl_release(EXT3_I(inode)->i_default_acl);
510 EXT3_I(inode)->i_default_acl = EXT3_ACL_NOT_CACHED;
511 }
512 #endif
513 ext3_discard_reservation(inode);
514 EXT3_I(inode)->i_block_alloc_info = NULL;
515 kfree(rsv);
516 }
517
518 static inline void ext3_show_quota_options(struct seq_file *seq, struct super_block *sb)
519 {
520 #if defined(CONFIG_QUOTA)
521 struct ext3_sb_info *sbi = EXT3_SB(sb);
522
523 if (sbi->s_jquota_fmt)
524 seq_printf(seq, ",jqfmt=%s",
525 (sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold": "vfsv0");
526
527 if (sbi->s_qf_names[USRQUOTA])
528 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
529
530 if (sbi->s_qf_names[GRPQUOTA])
531 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
532
533 if (sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA)
534 seq_puts(seq, ",usrquota");
535
536 if (sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA)
537 seq_puts(seq, ",grpquota");
538 #endif
539 }
540
541 static int ext3_show_options(struct seq_file *seq, struct vfsmount *vfs)
542 {
543 struct super_block *sb = vfs->mnt_sb;
544
545 if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA)
546 seq_puts(seq, ",data=journal");
547 else if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA)
548 seq_puts(seq, ",data=ordered");
549 else if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)
550 seq_puts(seq, ",data=writeback");
551
552 ext3_show_quota_options(seq, sb);
553
554 return 0;
555 }
556
557 #ifdef CONFIG_QUOTA
558 #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
559 #define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
560
561 static int ext3_dquot_initialize(struct inode *inode, int type);
562 static int ext3_dquot_drop(struct inode *inode);
563 static int ext3_write_dquot(struct dquot *dquot);
564 static int ext3_acquire_dquot(struct dquot *dquot);
565 static int ext3_release_dquot(struct dquot *dquot);
566 static int ext3_mark_dquot_dirty(struct dquot *dquot);
567 static int ext3_write_info(struct super_block *sb, int type);
568 static int ext3_quota_on(struct super_block *sb, int type, int format_id, char *path);
569 static int ext3_quota_on_mount(struct super_block *sb, int type);
570 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
571 size_t len, loff_t off);
572 static ssize_t ext3_quota_write(struct super_block *sb, int type,
573 const char *data, size_t len, loff_t off);
574
575 static struct dquot_operations ext3_quota_operations = {
576 .initialize = ext3_dquot_initialize,
577 .drop = ext3_dquot_drop,
578 .alloc_space = dquot_alloc_space,
579 .alloc_inode = dquot_alloc_inode,
580 .free_space = dquot_free_space,
581 .free_inode = dquot_free_inode,
582 .transfer = dquot_transfer,
583 .write_dquot = ext3_write_dquot,
584 .acquire_dquot = ext3_acquire_dquot,
585 .release_dquot = ext3_release_dquot,
586 .mark_dirty = ext3_mark_dquot_dirty,
587 .write_info = ext3_write_info
588 };
589
590 static struct quotactl_ops ext3_qctl_operations = {
591 .quota_on = ext3_quota_on,
592 .quota_off = vfs_quota_off,
593 .quota_sync = vfs_quota_sync,
594 .get_info = vfs_get_dqinfo,
595 .set_info = vfs_set_dqinfo,
596 .get_dqblk = vfs_get_dqblk,
597 .set_dqblk = vfs_set_dqblk
598 };
599 #endif
600
601 static struct super_operations ext3_sops = {
602 .alloc_inode = ext3_alloc_inode,
603 .destroy_inode = ext3_destroy_inode,
604 .read_inode = ext3_read_inode,
605 .write_inode = ext3_write_inode,
606 .dirty_inode = ext3_dirty_inode,
607 .delete_inode = ext3_delete_inode,
608 .put_super = ext3_put_super,
609 .write_super = ext3_write_super,
610 .sync_fs = ext3_sync_fs,
611 .write_super_lockfs = ext3_write_super_lockfs,
612 .unlockfs = ext3_unlockfs,
613 .statfs = ext3_statfs,
614 .remount_fs = ext3_remount,
615 .clear_inode = ext3_clear_inode,
616 .show_options = ext3_show_options,
617 #ifdef CONFIG_QUOTA
618 .quota_read = ext3_quota_read,
619 .quota_write = ext3_quota_write,
620 #endif
621 };
622
623 static struct export_operations ext3_export_ops = {
624 .get_parent = ext3_get_parent,
625 };
626
627 enum {
628 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
629 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
630 Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
631 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
632 Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh,
633 Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
634 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
635 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
636 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota,
637 Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota,
638 Opt_grpquota
639 };
640
641 static match_table_t tokens = {
642 {Opt_bsd_df, "bsddf"},
643 {Opt_minix_df, "minixdf"},
644 {Opt_grpid, "grpid"},
645 {Opt_grpid, "bsdgroups"},
646 {Opt_nogrpid, "nogrpid"},
647 {Opt_nogrpid, "sysvgroups"},
648 {Opt_resgid, "resgid=%u"},
649 {Opt_resuid, "resuid=%u"},
650 {Opt_sb, "sb=%u"},
651 {Opt_err_cont, "errors=continue"},
652 {Opt_err_panic, "errors=panic"},
653 {Opt_err_ro, "errors=remount-ro"},
654 {Opt_nouid32, "nouid32"},
655 {Opt_nocheck, "nocheck"},
656 {Opt_nocheck, "check=none"},
657 {Opt_debug, "debug"},
658 {Opt_oldalloc, "oldalloc"},
659 {Opt_orlov, "orlov"},
660 {Opt_user_xattr, "user_xattr"},
661 {Opt_nouser_xattr, "nouser_xattr"},
662 {Opt_acl, "acl"},
663 {Opt_noacl, "noacl"},
664 {Opt_reservation, "reservation"},
665 {Opt_noreservation, "noreservation"},
666 {Opt_noload, "noload"},
667 {Opt_nobh, "nobh"},
668 {Opt_commit, "commit=%u"},
669 {Opt_journal_update, "journal=update"},
670 {Opt_journal_inum, "journal=%u"},
671 {Opt_journal_dev, "journal_dev=%u"},
672 {Opt_abort, "abort"},
673 {Opt_data_journal, "data=journal"},
674 {Opt_data_ordered, "data=ordered"},
675 {Opt_data_writeback, "data=writeback"},
676 {Opt_offusrjquota, "usrjquota="},
677 {Opt_usrjquota, "usrjquota=%s"},
678 {Opt_offgrpjquota, "grpjquota="},
679 {Opt_grpjquota, "grpjquota=%s"},
680 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
681 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
682 {Opt_grpquota, "grpquota"},
683 {Opt_noquota, "noquota"},
684 {Opt_quota, "quota"},
685 {Opt_usrquota, "usrquota"},
686 {Opt_barrier, "barrier=%u"},
687 {Opt_err, NULL},
688 {Opt_resize, "resize"},
689 };
690
691 static unsigned long get_sb_block(void **data)
692 {
693 unsigned long sb_block;
694 char *options = (char *) *data;
695
696 if (!options || strncmp(options, "sb=", 3) != 0)
697 return 1; /* Default location */
698 options += 3;
699 sb_block = simple_strtoul(options, &options, 0);
700 if (*options && *options != ',') {
701 printk("EXT3-fs: Invalid sb specification: %s\n",
702 (char *) *data);
703 return 1;
704 }
705 if (*options == ',')
706 options++;
707 *data = (void *) options;
708 return sb_block;
709 }
710
711 static int parse_options (char *options, struct super_block *sb,
712 unsigned long *inum, unsigned long *journal_devnum,
713 unsigned long *n_blocks_count, int is_remount)
714 {
715 struct ext3_sb_info *sbi = EXT3_SB(sb);
716 char * p;
717 substring_t args[MAX_OPT_ARGS];
718 int data_opt = 0;
719 int option;
720 #ifdef CONFIG_QUOTA
721 int qtype;
722 char *qname;
723 #endif
724
725 if (!options)
726 return 1;
727
728 while ((p = strsep (&options, ",")) != NULL) {
729 int token;
730 if (!*p)
731 continue;
732
733 token = match_token(p, tokens, args);
734 switch (token) {
735 case Opt_bsd_df:
736 clear_opt (sbi->s_mount_opt, MINIX_DF);
737 break;
738 case Opt_minix_df:
739 set_opt (sbi->s_mount_opt, MINIX_DF);
740 break;
741 case Opt_grpid:
742 set_opt (sbi->s_mount_opt, GRPID);
743 break;
744 case Opt_nogrpid:
745 clear_opt (sbi->s_mount_opt, GRPID);
746 break;
747 case Opt_resuid:
748 if (match_int(&args[0], &option))
749 return 0;
750 sbi->s_resuid = option;
751 break;
752 case Opt_resgid:
753 if (match_int(&args[0], &option))
754 return 0;
755 sbi->s_resgid = option;
756 break;
757 case Opt_sb:
758 /* handled by get_sb_block() instead of here */
759 /* *sb_block = match_int(&args[0]); */
760 break;
761 case Opt_err_panic:
762 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
763 clear_opt (sbi->s_mount_opt, ERRORS_RO);
764 set_opt (sbi->s_mount_opt, ERRORS_PANIC);
765 break;
766 case Opt_err_ro:
767 clear_opt (sbi->s_mount_opt, ERRORS_CONT);
768 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
769 set_opt (sbi->s_mount_opt, ERRORS_RO);
770 break;
771 case Opt_err_cont:
772 clear_opt (sbi->s_mount_opt, ERRORS_RO);
773 clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
774 set_opt (sbi->s_mount_opt, ERRORS_CONT);
775 break;
776 case Opt_nouid32:
777 set_opt (sbi->s_mount_opt, NO_UID32);
778 break;
779 case Opt_nocheck:
780 clear_opt (sbi->s_mount_opt, CHECK);
781 break;
782 case Opt_debug:
783 set_opt (sbi->s_mount_opt, DEBUG);
784 break;
785 case Opt_oldalloc:
786 set_opt (sbi->s_mount_opt, OLDALLOC);
787 break;
788 case Opt_orlov:
789 clear_opt (sbi->s_mount_opt, OLDALLOC);
790 break;
791 #ifdef CONFIG_EXT3_FS_XATTR
792 case Opt_user_xattr:
793 set_opt (sbi->s_mount_opt, XATTR_USER);
794 break;
795 case Opt_nouser_xattr:
796 clear_opt (sbi->s_mount_opt, XATTR_USER);
797 break;
798 #else
799 case Opt_user_xattr:
800 case Opt_nouser_xattr:
801 printk("EXT3 (no)user_xattr options not supported\n");
802 break;
803 #endif
804 #ifdef CONFIG_EXT3_FS_POSIX_ACL
805 case Opt_acl:
806 set_opt(sbi->s_mount_opt, POSIX_ACL);
807 break;
808 case Opt_noacl:
809 clear_opt(sbi->s_mount_opt, POSIX_ACL);
810 break;
811 #else
812 case Opt_acl:
813 case Opt_noacl:
814 printk("EXT3 (no)acl options not supported\n");
815 break;
816 #endif
817 case Opt_reservation:
818 set_opt(sbi->s_mount_opt, RESERVATION);
819 break;
820 case Opt_noreservation:
821 clear_opt(sbi->s_mount_opt, RESERVATION);
822 break;
823 case Opt_journal_update:
824 /* @@@ FIXME */
825 /* Eventually we will want to be able to create
826 a journal file here. For now, only allow the
827 user to specify an existing inode to be the
828 journal file. */
829 if (is_remount) {
830 printk(KERN_ERR "EXT3-fs: cannot specify "
831 "journal on remount\n");
832 return 0;
833 }
834 set_opt (sbi->s_mount_opt, UPDATE_JOURNAL);
835 break;
836 case Opt_journal_inum:
837 if (is_remount) {
838 printk(KERN_ERR "EXT3-fs: cannot specify "
839 "journal on remount\n");
840 return 0;
841 }
842 if (match_int(&args[0], &option))
843 return 0;
844 *inum = option;
845 break;
846 case Opt_journal_dev:
847 if (is_remount) {
848 printk(KERN_ERR "EXT3-fs: cannot specify "
849 "journal on remount\n");
850 return 0;
851 }
852 if (match_int(&args[0], &option))
853 return 0;
854 *journal_devnum = option;
855 break;
856 case Opt_noload:
857 set_opt (sbi->s_mount_opt, NOLOAD);
858 break;
859 case Opt_commit:
860 if (match_int(&args[0], &option))
861 return 0;
862 if (option < 0)
863 return 0;
864 if (option == 0)
865 option = JBD_DEFAULT_MAX_COMMIT_AGE;
866 sbi->s_commit_interval = HZ * option;
867 break;
868 case Opt_data_journal:
869 data_opt = EXT3_MOUNT_JOURNAL_DATA;
870 goto datacheck;
871 case Opt_data_ordered:
872 data_opt = EXT3_MOUNT_ORDERED_DATA;
873 goto datacheck;
874 case Opt_data_writeback:
875 data_opt = EXT3_MOUNT_WRITEBACK_DATA;
876 datacheck:
877 if (is_remount) {
878 if ((sbi->s_mount_opt & EXT3_MOUNT_DATA_FLAGS)
879 != data_opt) {
880 printk(KERN_ERR
881 "EXT3-fs: cannot change data "
882 "mode on remount\n");
883 return 0;
884 }
885 } else {
886 sbi->s_mount_opt &= ~EXT3_MOUNT_DATA_FLAGS;
887 sbi->s_mount_opt |= data_opt;
888 }
889 break;
890 #ifdef CONFIG_QUOTA
891 case Opt_usrjquota:
892 qtype = USRQUOTA;
893 goto set_qf_name;
894 case Opt_grpjquota:
895 qtype = GRPQUOTA;
896 set_qf_name:
897 if (sb_any_quota_enabled(sb)) {
898 printk(KERN_ERR
899 "EXT3-fs: Cannot change journalled "
900 "quota options when quota turned on.\n");
901 return 0;
902 }
903 qname = match_strdup(&args[0]);
904 if (!qname) {
905 printk(KERN_ERR
906 "EXT3-fs: not enough memory for "
907 "storing quotafile name.\n");
908 return 0;
909 }
910 if (sbi->s_qf_names[qtype] &&
911 strcmp(sbi->s_qf_names[qtype], qname)) {
912 printk(KERN_ERR
913 "EXT3-fs: %s quota file already "
914 "specified.\n", QTYPE2NAME(qtype));
915 kfree(qname);
916 return 0;
917 }
918 sbi->s_qf_names[qtype] = qname;
919 if (strchr(sbi->s_qf_names[qtype], '/')) {
920 printk(KERN_ERR
921 "EXT3-fs: quotafile must be on "
922 "filesystem root.\n");
923 kfree(sbi->s_qf_names[qtype]);
924 sbi->s_qf_names[qtype] = NULL;
925 return 0;
926 }
927 set_opt(sbi->s_mount_opt, QUOTA);
928 break;
929 case Opt_offusrjquota:
930 qtype = USRQUOTA;
931 goto clear_qf_name;
932 case Opt_offgrpjquota:
933 qtype = GRPQUOTA;
934 clear_qf_name:
935 if (sb_any_quota_enabled(sb)) {
936 printk(KERN_ERR "EXT3-fs: Cannot change "
937 "journalled quota options when "
938 "quota turned on.\n");
939 return 0;
940 }
941 /*
942 * The space will be released later when all options
943 * are confirmed to be correct
944 */
945 sbi->s_qf_names[qtype] = NULL;
946 break;
947 case Opt_jqfmt_vfsold:
948 sbi->s_jquota_fmt = QFMT_VFS_OLD;
949 break;
950 case Opt_jqfmt_vfsv0:
951 sbi->s_jquota_fmt = QFMT_VFS_V0;
952 break;
953 case Opt_quota:
954 case Opt_usrquota:
955 set_opt(sbi->s_mount_opt, QUOTA);
956 set_opt(sbi->s_mount_opt, USRQUOTA);
957 break;
958 case Opt_grpquota:
959 set_opt(sbi->s_mount_opt, QUOTA);
960 set_opt(sbi->s_mount_opt, GRPQUOTA);
961 break;
962 case Opt_noquota:
963 if (sb_any_quota_enabled(sb)) {
964 printk(KERN_ERR "EXT3-fs: Cannot change quota "
965 "options when quota turned on.\n");
966 return 0;
967 }
968 clear_opt(sbi->s_mount_opt, QUOTA);
969 clear_opt(sbi->s_mount_opt, USRQUOTA);
970 clear_opt(sbi->s_mount_opt, GRPQUOTA);
971 break;
972 #else
973 case Opt_quota:
974 case Opt_usrquota:
975 case Opt_grpquota:
976 case Opt_usrjquota:
977 case Opt_grpjquota:
978 case Opt_offusrjquota:
979 case Opt_offgrpjquota:
980 case Opt_jqfmt_vfsold:
981 case Opt_jqfmt_vfsv0:
982 printk(KERN_ERR
983 "EXT3-fs: journalled quota options not "
984 "supported.\n");
985 break;
986 case Opt_noquota:
987 break;
988 #endif
989 case Opt_abort:
990 set_opt(sbi->s_mount_opt, ABORT);
991 break;
992 case Opt_barrier:
993 if (match_int(&args[0], &option))
994 return 0;
995 if (option)
996 set_opt(sbi->s_mount_opt, BARRIER);
997 else
998 clear_opt(sbi->s_mount_opt, BARRIER);
999 break;
1000 case Opt_ignore:
1001 break;
1002 case Opt_resize:
1003 if (!is_remount) {
1004 printk("EXT3-fs: resize option only available "
1005 "for remount\n");
1006 return 0;
1007 }
1008 if (match_int(&args[0], &option) != 0)
1009 return 0;
1010 *n_blocks_count = option;
1011 break;
1012 case Opt_nobh:
1013 set_opt(sbi->s_mount_opt, NOBH);
1014 break;
1015 default:
1016 printk (KERN_ERR
1017 "EXT3-fs: Unrecognized mount option \"%s\" "
1018 "or missing value\n", p);
1019 return 0;
1020 }
1021 }
1022 #ifdef CONFIG_QUOTA
1023 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1024 if ((sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA) &&
1025 sbi->s_qf_names[USRQUOTA])
1026 clear_opt(sbi->s_mount_opt, USRQUOTA);
1027
1028 if ((sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA) &&
1029 sbi->s_qf_names[GRPQUOTA])
1030 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1031
1032 if ((sbi->s_qf_names[USRQUOTA] &&
1033 (sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA)) ||
1034 (sbi->s_qf_names[GRPQUOTA] &&
1035 (sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA))) {
1036 printk(KERN_ERR "EXT3-fs: old and new quota "
1037 "format mixing.\n");
1038 return 0;
1039 }
1040
1041 if (!sbi->s_jquota_fmt) {
1042 printk(KERN_ERR "EXT3-fs: journalled quota format "
1043 "not specified.\n");
1044 return 0;
1045 }
1046 } else {
1047 if (sbi->s_jquota_fmt) {
1048 printk(KERN_ERR "EXT3-fs: journalled quota format "
1049 "specified with no journalling "
1050 "enabled.\n");
1051 return 0;
1052 }
1053 }
1054 #endif
1055 return 1;
1056 }
1057
1058 static int ext3_setup_super(struct super_block *sb, struct ext3_super_block *es,
1059 int read_only)
1060 {
1061 struct ext3_sb_info *sbi = EXT3_SB(sb);
1062 int res = 0;
1063
1064 if (le32_to_cpu(es->s_rev_level) > EXT3_MAX_SUPP_REV) {
1065 printk (KERN_ERR "EXT3-fs warning: revision level too high, "
1066 "forcing read-only mode\n");
1067 res = MS_RDONLY;
1068 }
1069 if (read_only)
1070 return res;
1071 if (!(sbi->s_mount_state & EXT3_VALID_FS))
1072 printk (KERN_WARNING "EXT3-fs warning: mounting unchecked fs, "
1073 "running e2fsck is recommended\n");
1074 else if ((sbi->s_mount_state & EXT3_ERROR_FS))
1075 printk (KERN_WARNING
1076 "EXT3-fs warning: mounting fs with errors, "
1077 "running e2fsck is recommended\n");
1078 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
1079 le16_to_cpu(es->s_mnt_count) >=
1080 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
1081 printk (KERN_WARNING
1082 "EXT3-fs warning: maximal mount count reached, "
1083 "running e2fsck is recommended\n");
1084 else if (le32_to_cpu(es->s_checkinterval) &&
1085 (le32_to_cpu(es->s_lastcheck) +
1086 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1087 printk (KERN_WARNING
1088 "EXT3-fs warning: checktime reached, "
1089 "running e2fsck is recommended\n");
1090 #if 0
1091 /* @@@ We _will_ want to clear the valid bit if we find
1092 inconsistencies, to force a fsck at reboot. But for
1093 a plain journaled filesystem we can keep it set as
1094 valid forever! :) */
1095 es->s_state = cpu_to_le16(le16_to_cpu(es->s_state) & ~EXT3_VALID_FS);
1096 #endif
1097 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
1098 es->s_max_mnt_count = cpu_to_le16(EXT3_DFL_MAX_MNT_COUNT);
1099 es->s_mnt_count=cpu_to_le16(le16_to_cpu(es->s_mnt_count) + 1);
1100 es->s_mtime = cpu_to_le32(get_seconds());
1101 ext3_update_dynamic_rev(sb);
1102 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
1103
1104 ext3_commit_super(sb, es, 1);
1105 if (test_opt(sb, DEBUG))
1106 printk(KERN_INFO "[EXT3 FS bs=%lu, gc=%lu, "
1107 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
1108 sb->s_blocksize,
1109 sbi->s_groups_count,
1110 EXT3_BLOCKS_PER_GROUP(sb),
1111 EXT3_INODES_PER_GROUP(sb),
1112 sbi->s_mount_opt);
1113
1114 printk(KERN_INFO "EXT3 FS on %s, ", sb->s_id);
1115 if (EXT3_SB(sb)->s_journal->j_inode == NULL) {
1116 char b[BDEVNAME_SIZE];
1117
1118 printk("external journal on %s\n",
1119 bdevname(EXT3_SB(sb)->s_journal->j_dev, b));
1120 } else {
1121 printk("internal journal\n");
1122 }
1123 return res;
1124 }
1125
1126 /* Called at mount-time, super-block is locked */
1127 static int ext3_check_descriptors (struct super_block * sb)
1128 {
1129 struct ext3_sb_info *sbi = EXT3_SB(sb);
1130 unsigned long block = le32_to_cpu(sbi->s_es->s_first_data_block);
1131 struct ext3_group_desc * gdp = NULL;
1132 int desc_block = 0;
1133 int i;
1134
1135 ext3_debug ("Checking group descriptors");
1136
1137 for (i = 0; i < sbi->s_groups_count; i++)
1138 {
1139 if ((i % EXT3_DESC_PER_BLOCK(sb)) == 0)
1140 gdp = (struct ext3_group_desc *)
1141 sbi->s_group_desc[desc_block++]->b_data;
1142 if (le32_to_cpu(gdp->bg_block_bitmap) < block ||
1143 le32_to_cpu(gdp->bg_block_bitmap) >=
1144 block + EXT3_BLOCKS_PER_GROUP(sb))
1145 {
1146 ext3_error (sb, "ext3_check_descriptors",
1147 "Block bitmap for group %d"
1148 " not in group (block %lu)!",
1149 i, (unsigned long)
1150 le32_to_cpu(gdp->bg_block_bitmap));
1151 return 0;
1152 }
1153 if (le32_to_cpu(gdp->bg_inode_bitmap) < block ||
1154 le32_to_cpu(gdp->bg_inode_bitmap) >=
1155 block + EXT3_BLOCKS_PER_GROUP(sb))
1156 {
1157 ext3_error (sb, "ext3_check_descriptors",
1158 "Inode bitmap for group %d"
1159 " not in group (block %lu)!",
1160 i, (unsigned long)
1161 le32_to_cpu(gdp->bg_inode_bitmap));
1162 return 0;
1163 }
1164 if (le32_to_cpu(gdp->bg_inode_table) < block ||
1165 le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group >=
1166 block + EXT3_BLOCKS_PER_GROUP(sb))
1167 {
1168 ext3_error (sb, "ext3_check_descriptors",
1169 "Inode table for group %d"
1170 " not in group (block %lu)!",
1171 i, (unsigned long)
1172 le32_to_cpu(gdp->bg_inode_table));
1173 return 0;
1174 }
1175 block += EXT3_BLOCKS_PER_GROUP(sb);
1176 gdp++;
1177 }
1178
1179 sbi->s_es->s_free_blocks_count=cpu_to_le32(ext3_count_free_blocks(sb));
1180 sbi->s_es->s_free_inodes_count=cpu_to_le32(ext3_count_free_inodes(sb));
1181 return 1;
1182 }
1183
1184
1185 /* ext3_orphan_cleanup() walks a singly-linked list of inodes (starting at
1186 * the superblock) which were deleted from all directories, but held open by
1187 * a process at the time of a crash. We walk the list and try to delete these
1188 * inodes at recovery time (only with a read-write filesystem).
1189 *
1190 * In order to keep the orphan inode chain consistent during traversal (in
1191 * case of crash during recovery), we link each inode into the superblock
1192 * orphan list_head and handle it the same way as an inode deletion during
1193 * normal operation (which journals the operations for us).
1194 *
1195 * We only do an iget() and an iput() on each inode, which is very safe if we
1196 * accidentally point at an in-use or already deleted inode. The worst that
1197 * can happen in this case is that we get a "bit already cleared" message from
1198 * ext3_free_inode(). The only reason we would point at a wrong inode is if
1199 * e2fsck was run on this filesystem, and it must have already done the orphan
1200 * inode cleanup for us, so we can safely abort without any further action.
1201 */
1202 static void ext3_orphan_cleanup (struct super_block * sb,
1203 struct ext3_super_block * es)
1204 {
1205 unsigned int s_flags = sb->s_flags;
1206 int nr_orphans = 0, nr_truncates = 0;
1207 #ifdef CONFIG_QUOTA
1208 int i;
1209 #endif
1210 if (!es->s_last_orphan) {
1211 jbd_debug(4, "no orphan inodes to clean up\n");
1212 return;
1213 }
1214
1215 if (EXT3_SB(sb)->s_mount_state & EXT3_ERROR_FS) {
1216 if (es->s_last_orphan)
1217 jbd_debug(1, "Errors on filesystem, "
1218 "clearing orphan list.\n");
1219 es->s_last_orphan = 0;
1220 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1221 return;
1222 }
1223
1224 if (s_flags & MS_RDONLY) {
1225 printk(KERN_INFO "EXT3-fs: %s: orphan cleanup on readonly fs\n",
1226 sb->s_id);
1227 sb->s_flags &= ~MS_RDONLY;
1228 }
1229 #ifdef CONFIG_QUOTA
1230 /* Needed for iput() to work correctly and not trash data */
1231 sb->s_flags |= MS_ACTIVE;
1232 /* Turn on quotas so that they are updated correctly */
1233 for (i = 0; i < MAXQUOTAS; i++) {
1234 if (EXT3_SB(sb)->s_qf_names[i]) {
1235 int ret = ext3_quota_on_mount(sb, i);
1236 if (ret < 0)
1237 printk(KERN_ERR
1238 "EXT3-fs: Cannot turn on journalled "
1239 "quota: error %d\n", ret);
1240 }
1241 }
1242 #endif
1243
1244 while (es->s_last_orphan) {
1245 struct inode *inode;
1246
1247 if (!(inode =
1248 ext3_orphan_get(sb, le32_to_cpu(es->s_last_orphan)))) {
1249 es->s_last_orphan = 0;
1250 break;
1251 }
1252
1253 list_add(&EXT3_I(inode)->i_orphan, &EXT3_SB(sb)->s_orphan);
1254 DQUOT_INIT(inode);
1255 if (inode->i_nlink) {
1256 printk(KERN_DEBUG
1257 "%s: truncating inode %ld to %Ld bytes\n",
1258 __FUNCTION__, inode->i_ino, inode->i_size);
1259 jbd_debug(2, "truncating inode %ld to %Ld bytes\n",
1260 inode->i_ino, inode->i_size);
1261 ext3_truncate(inode);
1262 nr_truncates++;
1263 } else {
1264 printk(KERN_DEBUG
1265 "%s: deleting unreferenced inode %ld\n",
1266 __FUNCTION__, inode->i_ino);
1267 jbd_debug(2, "deleting unreferenced inode %ld\n",
1268 inode->i_ino);
1269 nr_orphans++;
1270 }
1271 iput(inode); /* The delete magic happens here! */
1272 }
1273
1274 #define PLURAL(x) (x), ((x)==1) ? "" : "s"
1275
1276 if (nr_orphans)
1277 printk(KERN_INFO "EXT3-fs: %s: %d orphan inode%s deleted\n",
1278 sb->s_id, PLURAL(nr_orphans));
1279 if (nr_truncates)
1280 printk(KERN_INFO "EXT3-fs: %s: %d truncate%s cleaned up\n",
1281 sb->s_id, PLURAL(nr_truncates));
1282 #ifdef CONFIG_QUOTA
1283 /* Turn quotas off */
1284 for (i = 0; i < MAXQUOTAS; i++) {
1285 if (sb_dqopt(sb)->files[i])
1286 vfs_quota_off(sb, i);
1287 }
1288 #endif
1289 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1290 }
1291
1292 #define log2(n) ffz(~(n))
1293
1294 /*
1295 * Maximal file size. There is a direct, and {,double-,triple-}indirect
1296 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
1297 * We need to be 1 filesystem block less than the 2^32 sector limit.
1298 */
1299 static loff_t ext3_max_size(int bits)
1300 {
1301 loff_t res = EXT3_NDIR_BLOCKS;
1302 /* This constant is calculated to be the largest file size for a
1303 * dense, 4k-blocksize file such that the total number of
1304 * sectors in the file, including data and all indirect blocks,
1305 * does not exceed 2^32. */
1306 const loff_t upper_limit = 0x1ff7fffd000LL;
1307
1308 res += 1LL << (bits-2);
1309 res += 1LL << (2*(bits-2));
1310 res += 1LL << (3*(bits-2));
1311 res <<= bits;
1312 if (res > upper_limit)
1313 res = upper_limit;
1314 return res;
1315 }
1316
1317 static unsigned long descriptor_loc(struct super_block *sb,
1318 unsigned long logic_sb_block,
1319 int nr)
1320 {
1321 struct ext3_sb_info *sbi = EXT3_SB(sb);
1322 unsigned long bg, first_data_block, first_meta_bg;
1323 int has_super = 0;
1324
1325 first_data_block = le32_to_cpu(sbi->s_es->s_first_data_block);
1326 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1327
1328 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_META_BG) ||
1329 nr < first_meta_bg)
1330 return (logic_sb_block + nr + 1);
1331 bg = sbi->s_desc_per_block * nr;
1332 if (ext3_bg_has_super(sb, bg))
1333 has_super = 1;
1334 return (first_data_block + has_super + (bg * sbi->s_blocks_per_group));
1335 }
1336
1337
1338 static int ext3_fill_super (struct super_block *sb, void *data, int silent)
1339 {
1340 struct buffer_head * bh;
1341 struct ext3_super_block *es = NULL;
1342 struct ext3_sb_info *sbi;
1343 unsigned long block;
1344 unsigned long sb_block = get_sb_block(&data);
1345 unsigned long logic_sb_block;
1346 unsigned long offset = 0;
1347 unsigned long journal_inum = 0;
1348 unsigned long journal_devnum = 0;
1349 unsigned long def_mount_opts;
1350 struct inode *root;
1351 int blocksize;
1352 int hblock;
1353 int db_count;
1354 int i;
1355 int needs_recovery;
1356 __le32 features;
1357
1358 sbi = kmalloc(sizeof(*sbi), GFP_KERNEL);
1359 if (!sbi)
1360 return -ENOMEM;
1361 sb->s_fs_info = sbi;
1362 memset(sbi, 0, sizeof(*sbi));
1363 sbi->s_mount_opt = 0;
1364 sbi->s_resuid = EXT3_DEF_RESUID;
1365 sbi->s_resgid = EXT3_DEF_RESGID;
1366
1367 unlock_kernel();
1368
1369 blocksize = sb_min_blocksize(sb, EXT3_MIN_BLOCK_SIZE);
1370 if (!blocksize) {
1371 printk(KERN_ERR "EXT3-fs: unable to set blocksize\n");
1372 goto out_fail;
1373 }
1374
1375 /*
1376 * The ext3 superblock will not be buffer aligned for other than 1kB
1377 * block sizes. We need to calculate the offset from buffer start.
1378 */
1379 if (blocksize != EXT3_MIN_BLOCK_SIZE) {
1380 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1381 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1382 } else {
1383 logic_sb_block = sb_block;
1384 }
1385
1386 if (!(bh = sb_bread(sb, logic_sb_block))) {
1387 printk (KERN_ERR "EXT3-fs: unable to read superblock\n");
1388 goto out_fail;
1389 }
1390 /*
1391 * Note: s_es must be initialized as soon as possible because
1392 * some ext3 macro-instructions depend on its value
1393 */
1394 es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
1395 sbi->s_es = es;
1396 sb->s_magic = le16_to_cpu(es->s_magic);
1397 if (sb->s_magic != EXT3_SUPER_MAGIC)
1398 goto cantfind_ext3;
1399
1400 /* Set defaults before we parse the mount options */
1401 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
1402 if (def_mount_opts & EXT3_DEFM_DEBUG)
1403 set_opt(sbi->s_mount_opt, DEBUG);
1404 if (def_mount_opts & EXT3_DEFM_BSDGROUPS)
1405 set_opt(sbi->s_mount_opt, GRPID);
1406 if (def_mount_opts & EXT3_DEFM_UID16)
1407 set_opt(sbi->s_mount_opt, NO_UID32);
1408 if (def_mount_opts & EXT3_DEFM_XATTR_USER)
1409 set_opt(sbi->s_mount_opt, XATTR_USER);
1410 if (def_mount_opts & EXT3_DEFM_ACL)
1411 set_opt(sbi->s_mount_opt, POSIX_ACL);
1412 if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_DATA)
1413 sbi->s_mount_opt |= EXT3_MOUNT_JOURNAL_DATA;
1414 else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_ORDERED)
1415 sbi->s_mount_opt |= EXT3_MOUNT_ORDERED_DATA;
1416 else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_WBACK)
1417 sbi->s_mount_opt |= EXT3_MOUNT_WRITEBACK_DATA;
1418
1419 if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_PANIC)
1420 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1421 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_RO)
1422 set_opt(sbi->s_mount_opt, ERRORS_RO);
1423
1424 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
1425 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
1426
1427 set_opt(sbi->s_mount_opt, RESERVATION);
1428
1429 if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
1430 NULL, 0))
1431 goto failed_mount;
1432
1433 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1434 ((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
1435
1436 if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV &&
1437 (EXT3_HAS_COMPAT_FEATURE(sb, ~0U) ||
1438 EXT3_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
1439 EXT3_HAS_INCOMPAT_FEATURE(sb, ~0U)))
1440 printk(KERN_WARNING
1441 "EXT3-fs warning: feature flags set on rev 0 fs, "
1442 "running e2fsck is recommended\n");
1443 /*
1444 * Check feature flags regardless of the revision level, since we
1445 * previously didn't change the revision level when setting the flags,
1446 * so there is a chance incompat flags are set on a rev 0 filesystem.
1447 */
1448 features = EXT3_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP);
1449 if (features) {
1450 printk(KERN_ERR "EXT3-fs: %s: couldn't mount because of "
1451 "unsupported optional features (%x).\n",
1452 sb->s_id, le32_to_cpu(features));
1453 goto failed_mount;
1454 }
1455 features = EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP);
1456 if (!(sb->s_flags & MS_RDONLY) && features) {
1457 printk(KERN_ERR "EXT3-fs: %s: couldn't mount RDWR because of "
1458 "unsupported optional features (%x).\n",
1459 sb->s_id, le32_to_cpu(features));
1460 goto failed_mount;
1461 }
1462 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
1463
1464 if (blocksize < EXT3_MIN_BLOCK_SIZE ||
1465 blocksize > EXT3_MAX_BLOCK_SIZE) {
1466 printk(KERN_ERR
1467 "EXT3-fs: Unsupported filesystem blocksize %d on %s.\n",
1468 blocksize, sb->s_id);
1469 goto failed_mount;
1470 }
1471
1472 hblock = bdev_hardsect_size(sb->s_bdev);
1473 if (sb->s_blocksize != blocksize) {
1474 /*
1475 * Make sure the blocksize for the filesystem is larger
1476 * than the hardware sectorsize for the machine.
1477 */
1478 if (blocksize < hblock) {
1479 printk(KERN_ERR "EXT3-fs: blocksize %d too small for "
1480 "device blocksize %d.\n", blocksize, hblock);
1481 goto failed_mount;
1482 }
1483
1484 brelse (bh);
1485 sb_set_blocksize(sb, blocksize);
1486 logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize;
1487 offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize;
1488 bh = sb_bread(sb, logic_sb_block);
1489 if (!bh) {
1490 printk(KERN_ERR
1491 "EXT3-fs: Can't read superblock on 2nd try.\n");
1492 goto failed_mount;
1493 }
1494 es = (struct ext3_super_block *)(((char *)bh->b_data) + offset);
1495 sbi->s_es = es;
1496 if (es->s_magic != cpu_to_le16(EXT3_SUPER_MAGIC)) {
1497 printk (KERN_ERR
1498 "EXT3-fs: Magic mismatch, very weird !\n");
1499 goto failed_mount;
1500 }
1501 }
1502
1503 sb->s_maxbytes = ext3_max_size(sb->s_blocksize_bits);
1504
1505 if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV) {
1506 sbi->s_inode_size = EXT3_GOOD_OLD_INODE_SIZE;
1507 sbi->s_first_ino = EXT3_GOOD_OLD_FIRST_INO;
1508 } else {
1509 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
1510 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
1511 if ((sbi->s_inode_size < EXT3_GOOD_OLD_INODE_SIZE) ||
1512 (sbi->s_inode_size & (sbi->s_inode_size - 1)) ||
1513 (sbi->s_inode_size > blocksize)) {
1514 printk (KERN_ERR
1515 "EXT3-fs: unsupported inode size: %d\n",
1516 sbi->s_inode_size);
1517 goto failed_mount;
1518 }
1519 }
1520 sbi->s_frag_size = EXT3_MIN_FRAG_SIZE <<
1521 le32_to_cpu(es->s_log_frag_size);
1522 if (blocksize != sbi->s_frag_size) {
1523 printk(KERN_ERR
1524 "EXT3-fs: fragsize %lu != blocksize %u (unsupported)\n",
1525 sbi->s_frag_size, blocksize);
1526 goto failed_mount;
1527 }
1528 sbi->s_frags_per_block = 1;
1529 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
1530 sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
1531 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
1532 if (EXT3_INODE_SIZE(sb) == 0)
1533 goto cantfind_ext3;
1534 sbi->s_inodes_per_block = blocksize / EXT3_INODE_SIZE(sb);
1535 if (sbi->s_inodes_per_block == 0)
1536 goto cantfind_ext3;
1537 sbi->s_itb_per_group = sbi->s_inodes_per_group /
1538 sbi->s_inodes_per_block;
1539 sbi->s_desc_per_block = blocksize / sizeof(struct ext3_group_desc);
1540 sbi->s_sbh = bh;
1541 sbi->s_mount_state = le16_to_cpu(es->s_state);
1542 sbi->s_addr_per_block_bits = log2(EXT3_ADDR_PER_BLOCK(sb));
1543 sbi->s_desc_per_block_bits = log2(EXT3_DESC_PER_BLOCK(sb));
1544 for (i=0; i < 4; i++)
1545 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
1546 sbi->s_def_hash_version = es->s_def_hash_version;
1547
1548 if (sbi->s_blocks_per_group > blocksize * 8) {
1549 printk (KERN_ERR
1550 "EXT3-fs: #blocks per group too big: %lu\n",
1551 sbi->s_blocks_per_group);
1552 goto failed_mount;
1553 }
1554 if (sbi->s_frags_per_group > blocksize * 8) {
1555 printk (KERN_ERR
1556 "EXT3-fs: #fragments per group too big: %lu\n",
1557 sbi->s_frags_per_group);
1558 goto failed_mount;
1559 }
1560 if (sbi->s_inodes_per_group > blocksize * 8) {
1561 printk (KERN_ERR
1562 "EXT3-fs: #inodes per group too big: %lu\n",
1563 sbi->s_inodes_per_group);
1564 goto failed_mount;
1565 }
1566
1567 if (EXT3_BLOCKS_PER_GROUP(sb) == 0)
1568 goto cantfind_ext3;
1569 sbi->s_groups_count = (le32_to_cpu(es->s_blocks_count) -
1570 le32_to_cpu(es->s_first_data_block) +
1571 EXT3_BLOCKS_PER_GROUP(sb) - 1) /
1572 EXT3_BLOCKS_PER_GROUP(sb);
1573 db_count = (sbi->s_groups_count + EXT3_DESC_PER_BLOCK(sb) - 1) /
1574 EXT3_DESC_PER_BLOCK(sb);
1575 sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
1576 GFP_KERNEL);
1577 if (sbi->s_group_desc == NULL) {
1578 printk (KERN_ERR "EXT3-fs: not enough memory\n");
1579 goto failed_mount;
1580 }
1581
1582 percpu_counter_init(&sbi->s_freeblocks_counter);
1583 percpu_counter_init(&sbi->s_freeinodes_counter);
1584 percpu_counter_init(&sbi->s_dirs_counter);
1585 bgl_lock_init(&sbi->s_blockgroup_lock);
1586
1587 for (i = 0; i < db_count; i++) {
1588 block = descriptor_loc(sb, logic_sb_block, i);
1589 sbi->s_group_desc[i] = sb_bread(sb, block);
1590 if (!sbi->s_group_desc[i]) {
1591 printk (KERN_ERR "EXT3-fs: "
1592 "can't read group descriptor %d\n", i);
1593 db_count = i;
1594 goto failed_mount2;
1595 }
1596 }
1597 if (!ext3_check_descriptors (sb)) {
1598 printk (KERN_ERR "EXT3-fs: group descriptors corrupted !\n");
1599 goto failed_mount2;
1600 }
1601 sbi->s_gdb_count = db_count;
1602 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1603 spin_lock_init(&sbi->s_next_gen_lock);
1604 /* per fileystem reservation list head & lock */
1605 spin_lock_init(&sbi->s_rsv_window_lock);
1606 sbi->s_rsv_window_root = RB_ROOT;
1607 /* Add a single, static dummy reservation to the start of the
1608 * reservation window list --- it gives us a placeholder for
1609 * append-at-start-of-list which makes the allocation logic
1610 * _much_ simpler. */
1611 sbi->s_rsv_window_head.rsv_start = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1612 sbi->s_rsv_window_head.rsv_end = EXT3_RESERVE_WINDOW_NOT_ALLOCATED;
1613 sbi->s_rsv_window_head.rsv_alloc_hit = 0;
1614 sbi->s_rsv_window_head.rsv_goal_size = 0;
1615 ext3_rsv_window_add(sb, &sbi->s_rsv_window_head);
1616
1617 /*
1618 * set up enough so that it can read an inode
1619 */
1620 sb->s_op = &ext3_sops;
1621 sb->s_export_op = &ext3_export_ops;
1622 sb->s_xattr = ext3_xattr_handlers;
1623 #ifdef CONFIG_QUOTA
1624 sb->s_qcop = &ext3_qctl_operations;
1625 sb->dq_op = &ext3_quota_operations;
1626 #endif
1627 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
1628
1629 sb->s_root = NULL;
1630
1631 needs_recovery = (es->s_last_orphan != 0 ||
1632 EXT3_HAS_INCOMPAT_FEATURE(sb,
1633 EXT3_FEATURE_INCOMPAT_RECOVER));
1634
1635 /*
1636 * The first inode we look at is the journal inode. Don't try
1637 * root first: it may be modified in the journal!
1638 */
1639 if (!test_opt(sb, NOLOAD) &&
1640 EXT3_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) {
1641 if (ext3_load_journal(sb, es, journal_devnum))
1642 goto failed_mount2;
1643 } else if (journal_inum) {
1644 if (ext3_create_journal(sb, es, journal_inum))
1645 goto failed_mount2;
1646 } else {
1647 if (!silent)
1648 printk (KERN_ERR
1649 "ext3: No journal on filesystem on %s\n",
1650 sb->s_id);
1651 goto failed_mount2;
1652 }
1653
1654 /* We have now updated the journal if required, so we can
1655 * validate the data journaling mode. */
1656 switch (test_opt(sb, DATA_FLAGS)) {
1657 case 0:
1658 /* No mode set, assume a default based on the journal
1659 capabilities: ORDERED_DATA if the journal can
1660 cope, else JOURNAL_DATA */
1661 if (journal_check_available_features
1662 (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE))
1663 set_opt(sbi->s_mount_opt, ORDERED_DATA);
1664 else
1665 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
1666 break;
1667
1668 case EXT3_MOUNT_ORDERED_DATA:
1669 case EXT3_MOUNT_WRITEBACK_DATA:
1670 if (!journal_check_available_features
1671 (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE)) {
1672 printk(KERN_ERR "EXT3-fs: Journal does not support "
1673 "requested data journaling mode\n");
1674 goto failed_mount3;
1675 }
1676 default:
1677 break;
1678 }
1679
1680 if (test_opt(sb, NOBH)) {
1681 if (!(test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)) {
1682 printk(KERN_WARNING "EXT3-fs: Ignoring nobh option - "
1683 "its supported only with writeback mode\n");
1684 clear_opt(sbi->s_mount_opt, NOBH);
1685 }
1686 }
1687 /*
1688 * The journal_load will have done any necessary log recovery,
1689 * so we can safely mount the rest of the filesystem now.
1690 */
1691
1692 root = iget(sb, EXT3_ROOT_INO);
1693 sb->s_root = d_alloc_root(root);
1694 if (!sb->s_root) {
1695 printk(KERN_ERR "EXT3-fs: get root inode failed\n");
1696 iput(root);
1697 goto failed_mount3;
1698 }
1699 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1700 dput(sb->s_root);
1701 sb->s_root = NULL;
1702 printk(KERN_ERR "EXT3-fs: corrupt root inode, run e2fsck\n");
1703 goto failed_mount3;
1704 }
1705
1706 ext3_setup_super (sb, es, sb->s_flags & MS_RDONLY);
1707 /*
1708 * akpm: core read_super() calls in here with the superblock locked.
1709 * That deadlocks, because orphan cleanup needs to lock the superblock
1710 * in numerous places. Here we just pop the lock - it's relatively
1711 * harmless, because we are now ready to accept write_super() requests,
1712 * and aviro says that's the only reason for hanging onto the
1713 * superblock lock.
1714 */
1715 EXT3_SB(sb)->s_mount_state |= EXT3_ORPHAN_FS;
1716 ext3_orphan_cleanup(sb, es);
1717 EXT3_SB(sb)->s_mount_state &= ~EXT3_ORPHAN_FS;
1718 if (needs_recovery)
1719 printk (KERN_INFO "EXT3-fs: recovery complete.\n");
1720 ext3_mark_recovery_complete(sb, es);
1721 printk (KERN_INFO "EXT3-fs: mounted filesystem with %s data mode.\n",
1722 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA ? "journal":
1723 test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA ? "ordered":
1724 "writeback");
1725
1726 percpu_counter_mod(&sbi->s_freeblocks_counter,
1727 ext3_count_free_blocks(sb));
1728 percpu_counter_mod(&sbi->s_freeinodes_counter,
1729 ext3_count_free_inodes(sb));
1730 percpu_counter_mod(&sbi->s_dirs_counter,
1731 ext3_count_dirs(sb));
1732
1733 lock_kernel();
1734 return 0;
1735
1736 cantfind_ext3:
1737 if (!silent)
1738 printk(KERN_ERR "VFS: Can't find ext3 filesystem on dev %s.\n",
1739 sb->s_id);
1740 goto failed_mount;
1741
1742 failed_mount3:
1743 journal_destroy(sbi->s_journal);
1744 failed_mount2:
1745 for (i = 0; i < db_count; i++)
1746 brelse(sbi->s_group_desc[i]);
1747 kfree(sbi->s_group_desc);
1748 failed_mount:
1749 #ifdef CONFIG_QUOTA
1750 for (i = 0; i < MAXQUOTAS; i++)
1751 kfree(sbi->s_qf_names[i]);
1752 #endif
1753 ext3_blkdev_remove(sbi);
1754 brelse(bh);
1755 out_fail:
1756 sb->s_fs_info = NULL;
1757 kfree(sbi);
1758 lock_kernel();
1759 return -EINVAL;
1760 }
1761
1762 /*
1763 * Setup any per-fs journal parameters now. We'll do this both on
1764 * initial mount, once the journal has been initialised but before we've
1765 * done any recovery; and again on any subsequent remount.
1766 */
1767 static void ext3_init_journal_params(struct super_block *sb, journal_t *journal)
1768 {
1769 struct ext3_sb_info *sbi = EXT3_SB(sb);
1770
1771 if (sbi->s_commit_interval)
1772 journal->j_commit_interval = sbi->s_commit_interval;
1773 /* We could also set up an ext3-specific default for the commit
1774 * interval here, but for now we'll just fall back to the jbd
1775 * default. */
1776
1777 spin_lock(&journal->j_state_lock);
1778 if (test_opt(sb, BARRIER))
1779 journal->j_flags |= JFS_BARRIER;
1780 else
1781 journal->j_flags &= ~JFS_BARRIER;
1782 spin_unlock(&journal->j_state_lock);
1783 }
1784
1785 static journal_t *ext3_get_journal(struct super_block *sb, int journal_inum)
1786 {
1787 struct inode *journal_inode;
1788 journal_t *journal;
1789
1790 /* First, test for the existence of a valid inode on disk. Bad
1791 * things happen if we iget() an unused inode, as the subsequent
1792 * iput() will try to delete it. */
1793
1794 journal_inode = iget(sb, journal_inum);
1795 if (!journal_inode) {
1796 printk(KERN_ERR "EXT3-fs: no journal found.\n");
1797 return NULL;
1798 }
1799 if (!journal_inode->i_nlink) {
1800 make_bad_inode(journal_inode);
1801 iput(journal_inode);
1802 printk(KERN_ERR "EXT3-fs: journal inode is deleted.\n");
1803 return NULL;
1804 }
1805
1806 jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
1807 journal_inode, journal_inode->i_size);
1808 if (is_bad_inode(journal_inode) || !S_ISREG(journal_inode->i_mode)) {
1809 printk(KERN_ERR "EXT3-fs: invalid journal inode.\n");
1810 iput(journal_inode);
1811 return NULL;
1812 }
1813
1814 journal = journal_init_inode(journal_inode);
1815 if (!journal) {
1816 printk(KERN_ERR "EXT3-fs: Could not load journal inode\n");
1817 iput(journal_inode);
1818 return NULL;
1819 }
1820 journal->j_private = sb;
1821 ext3_init_journal_params(sb, journal);
1822 return journal;
1823 }
1824
1825 static journal_t *ext3_get_dev_journal(struct super_block *sb,
1826 dev_t j_dev)
1827 {
1828 struct buffer_head * bh;
1829 journal_t *journal;
1830 int start;
1831 int len;
1832 int hblock, blocksize;
1833 unsigned long sb_block;
1834 unsigned long offset;
1835 struct ext3_super_block * es;
1836 struct block_device *bdev;
1837
1838 bdev = ext3_blkdev_get(j_dev);
1839 if (bdev == NULL)
1840 return NULL;
1841
1842 if (bd_claim(bdev, sb)) {
1843 printk(KERN_ERR
1844 "EXT3: failed to claim external journal device.\n");
1845 blkdev_put(bdev);
1846 return NULL;
1847 }
1848
1849 blocksize = sb->s_blocksize;
1850 hblock = bdev_hardsect_size(bdev);
1851 if (blocksize < hblock) {
1852 printk(KERN_ERR
1853 "EXT3-fs: blocksize too small for journal device.\n");
1854 goto out_bdev;
1855 }
1856
1857 sb_block = EXT3_MIN_BLOCK_SIZE / blocksize;
1858 offset = EXT3_MIN_BLOCK_SIZE % blocksize;
1859 set_blocksize(bdev, blocksize);
1860 if (!(bh = __bread(bdev, sb_block, blocksize))) {
1861 printk(KERN_ERR "EXT3-fs: couldn't read superblock of "
1862 "external journal\n");
1863 goto out_bdev;
1864 }
1865
1866 es = (struct ext3_super_block *) (((char *)bh->b_data) + offset);
1867 if ((le16_to_cpu(es->s_magic) != EXT3_SUPER_MAGIC) ||
1868 !(le32_to_cpu(es->s_feature_incompat) &
1869 EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) {
1870 printk(KERN_ERR "EXT3-fs: external journal has "
1871 "bad superblock\n");
1872 brelse(bh);
1873 goto out_bdev;
1874 }
1875
1876 if (memcmp(EXT3_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
1877 printk(KERN_ERR "EXT3-fs: journal UUID does not match\n");
1878 brelse(bh);
1879 goto out_bdev;
1880 }
1881
1882 len = le32_to_cpu(es->s_blocks_count);
1883 start = sb_block + 1;
1884 brelse(bh); /* we're done with the superblock */
1885
1886 journal = journal_init_dev(bdev, sb->s_bdev,
1887 start, len, blocksize);
1888 if (!journal) {
1889 printk(KERN_ERR "EXT3-fs: failed to create device journal\n");
1890 goto out_bdev;
1891 }
1892 journal->j_private = sb;
1893 ll_rw_block(READ, 1, &journal->j_sb_buffer);
1894 wait_on_buffer(journal->j_sb_buffer);
1895 if (!buffer_uptodate(journal->j_sb_buffer)) {
1896 printk(KERN_ERR "EXT3-fs: I/O error on journal device\n");
1897 goto out_journal;
1898 }
1899 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
1900 printk(KERN_ERR "EXT3-fs: External journal has more than one "
1901 "user (unsupported) - %d\n",
1902 be32_to_cpu(journal->j_superblock->s_nr_users));
1903 goto out_journal;
1904 }
1905 EXT3_SB(sb)->journal_bdev = bdev;
1906 ext3_init_journal_params(sb, journal);
1907 return journal;
1908 out_journal:
1909 journal_destroy(journal);
1910 out_bdev:
1911 ext3_blkdev_put(bdev);
1912 return NULL;
1913 }
1914
1915 static int ext3_load_journal(struct super_block *sb,
1916 struct ext3_super_block *es,
1917 unsigned long journal_devnum)
1918 {
1919 journal_t *journal;
1920 int journal_inum = le32_to_cpu(es->s_journal_inum);
1921 dev_t journal_dev;
1922 int err = 0;
1923 int really_read_only;
1924
1925 if (journal_devnum &&
1926 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
1927 printk(KERN_INFO "EXT3-fs: external journal device major/minor "
1928 "numbers have changed\n");
1929 journal_dev = new_decode_dev(journal_devnum);
1930 } else
1931 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
1932
1933 really_read_only = bdev_read_only(sb->s_bdev);
1934
1935 /*
1936 * Are we loading a blank journal or performing recovery after a
1937 * crash? For recovery, we need to check in advance whether we
1938 * can get read-write access to the device.
1939 */
1940
1941 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER)) {
1942 if (sb->s_flags & MS_RDONLY) {
1943 printk(KERN_INFO "EXT3-fs: INFO: recovery "
1944 "required on readonly filesystem.\n");
1945 if (really_read_only) {
1946 printk(KERN_ERR "EXT3-fs: write access "
1947 "unavailable, cannot proceed.\n");
1948 return -EROFS;
1949 }
1950 printk (KERN_INFO "EXT3-fs: write access will "
1951 "be enabled during recovery.\n");
1952 }
1953 }
1954
1955 if (journal_inum && journal_dev) {
1956 printk(KERN_ERR "EXT3-fs: filesystem has both journal "
1957 "and inode journals!\n");
1958 return -EINVAL;
1959 }
1960
1961 if (journal_inum) {
1962 if (!(journal = ext3_get_journal(sb, journal_inum)))
1963 return -EINVAL;
1964 } else {
1965 if (!(journal = ext3_get_dev_journal(sb, journal_dev)))
1966 return -EINVAL;
1967 }
1968
1969 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
1970 err = journal_update_format(journal);
1971 if (err) {
1972 printk(KERN_ERR "EXT3-fs: error updating journal.\n");
1973 journal_destroy(journal);
1974 return err;
1975 }
1976 }
1977
1978 if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER))
1979 err = journal_wipe(journal, !really_read_only);
1980 if (!err)
1981 err = journal_load(journal);
1982
1983 if (err) {
1984 printk(KERN_ERR "EXT3-fs: error loading journal.\n");
1985 journal_destroy(journal);
1986 return err;
1987 }
1988
1989 EXT3_SB(sb)->s_journal = journal;
1990 ext3_clear_journal_err(sb, es);
1991
1992 if (journal_devnum &&
1993 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
1994 es->s_journal_dev = cpu_to_le32(journal_devnum);
1995 sb->s_dirt = 1;
1996
1997 /* Make sure we flush the recovery flag to disk. */
1998 ext3_commit_super(sb, es, 1);
1999 }
2000
2001 return 0;
2002 }
2003
2004 static int ext3_create_journal(struct super_block * sb,
2005 struct ext3_super_block * es,
2006 int journal_inum)
2007 {
2008 journal_t *journal;
2009
2010 if (sb->s_flags & MS_RDONLY) {
2011 printk(KERN_ERR "EXT3-fs: readonly filesystem when trying to "
2012 "create journal.\n");
2013 return -EROFS;
2014 }
2015
2016 if (!(journal = ext3_get_journal(sb, journal_inum)))
2017 return -EINVAL;
2018
2019 printk(KERN_INFO "EXT3-fs: creating new journal on inode %d\n",
2020 journal_inum);
2021
2022 if (journal_create(journal)) {
2023 printk(KERN_ERR "EXT3-fs: error creating journal.\n");
2024 journal_destroy(journal);
2025 return -EIO;
2026 }
2027
2028 EXT3_SB(sb)->s_journal = journal;
2029
2030 ext3_update_dynamic_rev(sb);
2031 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2032 EXT3_SET_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL);
2033
2034 es->s_journal_inum = cpu_to_le32(journal_inum);
2035 sb->s_dirt = 1;
2036
2037 /* Make sure we flush the recovery flag to disk. */
2038 ext3_commit_super(sb, es, 1);
2039
2040 return 0;
2041 }
2042
2043 static void ext3_commit_super (struct super_block * sb,
2044 struct ext3_super_block * es,
2045 int sync)
2046 {
2047 struct buffer_head *sbh = EXT3_SB(sb)->s_sbh;
2048
2049 if (!sbh)
2050 return;
2051 es->s_wtime = cpu_to_le32(get_seconds());
2052 es->s_free_blocks_count = cpu_to_le32(ext3_count_free_blocks(sb));
2053 es->s_free_inodes_count = cpu_to_le32(ext3_count_free_inodes(sb));
2054 BUFFER_TRACE(sbh, "marking dirty");
2055 mark_buffer_dirty(sbh);
2056 if (sync)
2057 sync_dirty_buffer(sbh);
2058 }
2059
2060
2061 /*
2062 * Have we just finished recovery? If so, and if we are mounting (or
2063 * remounting) the filesystem readonly, then we will end up with a
2064 * consistent fs on disk. Record that fact.
2065 */
2066 static void ext3_mark_recovery_complete(struct super_block * sb,
2067 struct ext3_super_block * es)
2068 {
2069 journal_t *journal = EXT3_SB(sb)->s_journal;
2070
2071 journal_lock_updates(journal);
2072 journal_flush(journal);
2073 if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER) &&
2074 sb->s_flags & MS_RDONLY) {
2075 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2076 sb->s_dirt = 0;
2077 ext3_commit_super(sb, es, 1);
2078 }
2079 journal_unlock_updates(journal);
2080 }
2081
2082 /*
2083 * If we are mounting (or read-write remounting) a filesystem whose journal
2084 * has recorded an error from a previous lifetime, move that error to the
2085 * main filesystem now.
2086 */
2087 static void ext3_clear_journal_err(struct super_block * sb,
2088 struct ext3_super_block * es)
2089 {
2090 journal_t *journal;
2091 int j_errno;
2092 const char *errstr;
2093
2094 journal = EXT3_SB(sb)->s_journal;
2095
2096 /*
2097 * Now check for any error status which may have been recorded in the
2098 * journal by a prior ext3_error() or ext3_abort()
2099 */
2100
2101 j_errno = journal_errno(journal);
2102 if (j_errno) {
2103 char nbuf[16];
2104
2105 errstr = ext3_decode_error(sb, j_errno, nbuf);
2106 ext3_warning(sb, __FUNCTION__, "Filesystem error recorded "
2107 "from previous mount: %s", errstr);
2108 ext3_warning(sb, __FUNCTION__, "Marking fs in need of "
2109 "filesystem check.");
2110
2111 EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS;
2112 es->s_state |= cpu_to_le16(EXT3_ERROR_FS);
2113 ext3_commit_super (sb, es, 1);
2114
2115 journal_clear_err(journal);
2116 }
2117 }
2118
2119 /*
2120 * Force the running and committing transactions to commit,
2121 * and wait on the commit.
2122 */
2123 int ext3_force_commit(struct super_block *sb)
2124 {
2125 journal_t *journal;
2126 int ret;
2127
2128 if (sb->s_flags & MS_RDONLY)
2129 return 0;
2130
2131 journal = EXT3_SB(sb)->s_journal;
2132 sb->s_dirt = 0;
2133 ret = ext3_journal_force_commit(journal);
2134 return ret;
2135 }
2136
2137 /*
2138 * Ext3 always journals updates to the superblock itself, so we don't
2139 * have to propagate any other updates to the superblock on disk at this
2140 * point. Just start an async writeback to get the buffers on their way
2141 * to the disk.
2142 *
2143 * This implicitly triggers the writebehind on sync().
2144 */
2145
2146 static void ext3_write_super (struct super_block * sb)
2147 {
2148 if (mutex_trylock(&sb->s_lock) != 0)
2149 BUG();
2150 sb->s_dirt = 0;
2151 }
2152
2153 static int ext3_sync_fs(struct super_block *sb, int wait)
2154 {
2155 tid_t target;
2156
2157 sb->s_dirt = 0;
2158 if (journal_start_commit(EXT3_SB(sb)->s_journal, &target)) {
2159 if (wait)
2160 log_wait_commit(EXT3_SB(sb)->s_journal, target);
2161 }
2162 return 0;
2163 }
2164
2165 /*
2166 * LVM calls this function before a (read-only) snapshot is created. This
2167 * gives us a chance to flush the journal completely and mark the fs clean.
2168 */
2169 static void ext3_write_super_lockfs(struct super_block *sb)
2170 {
2171 sb->s_dirt = 0;
2172
2173 if (!(sb->s_flags & MS_RDONLY)) {
2174 journal_t *journal = EXT3_SB(sb)->s_journal;
2175
2176 /* Now we set up the journal barrier. */
2177 journal_lock_updates(journal);
2178 journal_flush(journal);
2179
2180 /* Journal blocked and flushed, clear needs_recovery flag. */
2181 EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2182 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2183 }
2184 }
2185
2186 /*
2187 * Called by LVM after the snapshot is done. We need to reset the RECOVER
2188 * flag here, even though the filesystem is not technically dirty yet.
2189 */
2190 static void ext3_unlockfs(struct super_block *sb)
2191 {
2192 if (!(sb->s_flags & MS_RDONLY)) {
2193 lock_super(sb);
2194 /* Reser the needs_recovery flag before the fs is unlocked. */
2195 EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER);
2196 ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1);
2197 unlock_super(sb);
2198 journal_unlock_updates(EXT3_SB(sb)->s_journal);
2199 }
2200 }
2201
2202 static int ext3_remount (struct super_block * sb, int * flags, char * data)
2203 {
2204 struct ext3_super_block * es;
2205 struct ext3_sb_info *sbi = EXT3_SB(sb);
2206 unsigned long n_blocks_count = 0;
2207 unsigned long old_sb_flags;
2208 struct ext3_mount_options old_opts;
2209 int err;
2210 #ifdef CONFIG_QUOTA
2211 int i;
2212 #endif
2213
2214 /* Store the original options */
2215 old_sb_flags = sb->s_flags;
2216 old_opts.s_mount_opt = sbi->s_mount_opt;
2217 old_opts.s_resuid = sbi->s_resuid;
2218 old_opts.s_resgid = sbi->s_resgid;
2219 old_opts.s_commit_interval = sbi->s_commit_interval;
2220 #ifdef CONFIG_QUOTA
2221 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
2222 for (i = 0; i < MAXQUOTAS; i++)
2223 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
2224 #endif
2225
2226 /*
2227 * Allow the "check" option to be passed as a remount option.
2228 */
2229 if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
2230 err = -EINVAL;
2231 goto restore_opts;
2232 }
2233
2234 if (sbi->s_mount_opt & EXT3_MOUNT_ABORT)
2235 ext3_abort(sb, __FUNCTION__, "Abort forced by user");
2236
2237 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
2238 ((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
2239
2240 es = sbi->s_es;
2241
2242 ext3_init_journal_params(sb, sbi->s_journal);
2243
2244 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
2245 n_blocks_count > le32_to_cpu(es->s_blocks_count)) {
2246 if (sbi->s_mount_opt & EXT3_MOUNT_ABORT) {
2247 err = -EROFS;
2248 goto restore_opts;
2249 }
2250
2251 if (*flags & MS_RDONLY) {
2252 /*
2253 * First of all, the unconditional stuff we have to do
2254 * to disable replay of the journal when we next remount
2255 */
2256 sb->s_flags |= MS_RDONLY;
2257
2258 /*
2259 * OK, test if we are remounting a valid rw partition
2260 * readonly, and if so set the rdonly flag and then
2261 * mark the partition as valid again.
2262 */
2263 if (!(es->s_state & cpu_to_le16(EXT3_VALID_FS)) &&
2264 (sbi->s_mount_state & EXT3_VALID_FS))
2265 es->s_state = cpu_to_le16(sbi->s_mount_state);
2266
2267 ext3_mark_recovery_complete(sb, es);
2268 } else {
2269 __le32 ret;
2270 if ((ret = EXT3_HAS_RO_COMPAT_FEATURE(sb,
2271 ~EXT3_FEATURE_RO_COMPAT_SUPP))) {
2272 printk(KERN_WARNING "EXT3-fs: %s: couldn't "
2273 "remount RDWR because of unsupported "
2274 "optional features (%x).\n",
2275 sb->s_id, le32_to_cpu(ret));
2276 err = -EROFS;
2277 goto restore_opts;
2278 }
2279 /*
2280 * Mounting a RDONLY partition read-write, so reread
2281 * and store the current valid flag. (It may have
2282 * been changed by e2fsck since we originally mounted
2283 * the partition.)
2284 */
2285 ext3_clear_journal_err(sb, es);
2286 sbi->s_mount_state = le16_to_cpu(es->s_state);
2287 if ((ret = ext3_group_extend(sb, es, n_blocks_count))) {
2288 err = ret;
2289 goto restore_opts;
2290 }
2291 if (!ext3_setup_super (sb, es, 0))
2292 sb->s_flags &= ~MS_RDONLY;
2293 }
2294 }
2295 #ifdef CONFIG_QUOTA
2296 /* Release old quota file names */
2297 for (i = 0; i < MAXQUOTAS; i++)
2298 if (old_opts.s_qf_names[i] &&
2299 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2300 kfree(old_opts.s_qf_names[i]);
2301 #endif
2302 return 0;
2303 restore_opts:
2304 sb->s_flags = old_sb_flags;
2305 sbi->s_mount_opt = old_opts.s_mount_opt;
2306 sbi->s_resuid = old_opts.s_resuid;
2307 sbi->s_resgid = old_opts.s_resgid;
2308 sbi->s_commit_interval = old_opts.s_commit_interval;
2309 #ifdef CONFIG_QUOTA
2310 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
2311 for (i = 0; i < MAXQUOTAS; i++) {
2312 if (sbi->s_qf_names[i] &&
2313 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2314 kfree(sbi->s_qf_names[i]);
2315 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
2316 }
2317 #endif
2318 return err;
2319 }
2320
2321 static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf)
2322 {
2323 struct super_block *sb = dentry->d_sb;
2324 struct ext3_sb_info *sbi = EXT3_SB(sb);
2325 struct ext3_super_block *es = sbi->s_es;
2326 unsigned long overhead;
2327 int i;
2328
2329 if (test_opt (sb, MINIX_DF))
2330 overhead = 0;
2331 else {
2332 unsigned long ngroups;
2333 ngroups = EXT3_SB(sb)->s_groups_count;
2334 smp_rmb();
2335
2336 /*
2337 * Compute the overhead (FS structures)
2338 */
2339
2340 /*
2341 * All of the blocks before first_data_block are
2342 * overhead
2343 */
2344 overhead = le32_to_cpu(es->s_first_data_block);
2345
2346 /*
2347 * Add the overhead attributed to the superblock and
2348 * block group descriptors. If the sparse superblocks
2349 * feature is turned on, then not all groups have this.
2350 */
2351 for (i = 0; i < ngroups; i++) {
2352 overhead += ext3_bg_has_super(sb, i) +
2353 ext3_bg_num_gdb(sb, i);
2354 cond_resched();
2355 }
2356
2357 /*
2358 * Every block group has an inode bitmap, a block
2359 * bitmap, and an inode table.
2360 */
2361 overhead += (ngroups * (2 + EXT3_SB(sb)->s_itb_per_group));
2362 }
2363
2364 buf->f_type = EXT3_SUPER_MAGIC;
2365 buf->f_bsize = sb->s_blocksize;
2366 buf->f_blocks = le32_to_cpu(es->s_blocks_count) - overhead;
2367 buf->f_bfree = percpu_counter_sum(&sbi->s_freeblocks_counter);
2368 buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count);
2369 if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count))
2370 buf->f_bavail = 0;
2371 buf->f_files = le32_to_cpu(es->s_inodes_count);
2372 buf->f_ffree = percpu_counter_sum(&sbi->s_freeinodes_counter);
2373 buf->f_namelen = EXT3_NAME_LEN;
2374 return 0;
2375 }
2376
2377 /* Helper function for writing quotas on sync - we need to start transaction before quota file
2378 * is locked for write. Otherwise the are possible deadlocks:
2379 * Process 1 Process 2
2380 * ext3_create() quota_sync()
2381 * journal_start() write_dquot()
2382 * DQUOT_INIT() down(dqio_mutex)
2383 * down(dqio_mutex) journal_start()
2384 *
2385 */
2386
2387 #ifdef CONFIG_QUOTA
2388
2389 static inline struct inode *dquot_to_inode(struct dquot *dquot)
2390 {
2391 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
2392 }
2393
2394 static int ext3_dquot_initialize(struct inode *inode, int type)
2395 {
2396 handle_t *handle;
2397 int ret, err;
2398
2399 /* We may create quota structure so we need to reserve enough blocks */
2400 handle = ext3_journal_start(inode, 2*EXT3_QUOTA_INIT_BLOCKS(inode->i_sb));
2401 if (IS_ERR(handle))
2402 return PTR_ERR(handle);
2403 ret = dquot_initialize(inode, type);
2404 err = ext3_journal_stop(handle);
2405 if (!ret)
2406 ret = err;
2407 return ret;
2408 }
2409
2410 static int ext3_dquot_drop(struct inode *inode)
2411 {
2412 handle_t *handle;
2413 int ret, err;
2414
2415 /* We may delete quota structure so we need to reserve enough blocks */
2416 handle = ext3_journal_start(inode, 2*EXT3_QUOTA_DEL_BLOCKS(inode->i_sb));
2417 if (IS_ERR(handle))
2418 return PTR_ERR(handle);
2419 ret = dquot_drop(inode);
2420 err = ext3_journal_stop(handle);
2421 if (!ret)
2422 ret = err;
2423 return ret;
2424 }
2425
2426 static int ext3_write_dquot(struct dquot *dquot)
2427 {
2428 int ret, err;
2429 handle_t *handle;
2430 struct inode *inode;
2431
2432 inode = dquot_to_inode(dquot);
2433 handle = ext3_journal_start(inode,
2434 EXT3_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2435 if (IS_ERR(handle))
2436 return PTR_ERR(handle);
2437 ret = dquot_commit(dquot);
2438 err = ext3_journal_stop(handle);
2439 if (!ret)
2440 ret = err;
2441 return ret;
2442 }
2443
2444 static int ext3_acquire_dquot(struct dquot *dquot)
2445 {
2446 int ret, err;
2447 handle_t *handle;
2448
2449 handle = ext3_journal_start(dquot_to_inode(dquot),
2450 EXT3_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2451 if (IS_ERR(handle))
2452 return PTR_ERR(handle);
2453 ret = dquot_acquire(dquot);
2454 err = ext3_journal_stop(handle);
2455 if (!ret)
2456 ret = err;
2457 return ret;
2458 }
2459
2460 static int ext3_release_dquot(struct dquot *dquot)
2461 {
2462 int ret, err;
2463 handle_t *handle;
2464
2465 handle = ext3_journal_start(dquot_to_inode(dquot),
2466 EXT3_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2467 if (IS_ERR(handle))
2468 return PTR_ERR(handle);
2469 ret = dquot_release(dquot);
2470 err = ext3_journal_stop(handle);
2471 if (!ret)
2472 ret = err;
2473 return ret;
2474 }
2475
2476 static int ext3_mark_dquot_dirty(struct dquot *dquot)
2477 {
2478 /* Are we journalling quotas? */
2479 if (EXT3_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2480 EXT3_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2481 dquot_mark_dquot_dirty(dquot);
2482 return ext3_write_dquot(dquot);
2483 } else {
2484 return dquot_mark_dquot_dirty(dquot);
2485 }
2486 }
2487
2488 static int ext3_write_info(struct super_block *sb, int type)
2489 {
2490 int ret, err;
2491 handle_t *handle;
2492
2493 /* Data block + inode block */
2494 handle = ext3_journal_start(sb->s_root->d_inode, 2);
2495 if (IS_ERR(handle))
2496 return PTR_ERR(handle);
2497 ret = dquot_commit_info(sb, type);
2498 err = ext3_journal_stop(handle);
2499 if (!ret)
2500 ret = err;
2501 return ret;
2502 }
2503
2504 /*
2505 * Turn on quotas during mount time - we need to find
2506 * the quota file and such...
2507 */
2508 static int ext3_quota_on_mount(struct super_block *sb, int type)
2509 {
2510 return vfs_quota_on_mount(sb, EXT3_SB(sb)->s_qf_names[type],
2511 EXT3_SB(sb)->s_jquota_fmt, type);
2512 }
2513
2514 /*
2515 * Standard function to be called on quota_on
2516 */
2517 static int ext3_quota_on(struct super_block *sb, int type, int format_id,
2518 char *path)
2519 {
2520 int err;
2521 struct nameidata nd;
2522
2523 if (!test_opt(sb, QUOTA))
2524 return -EINVAL;
2525 /* Not journalling quota? */
2526 if (!EXT3_SB(sb)->s_qf_names[USRQUOTA] &&
2527 !EXT3_SB(sb)->s_qf_names[GRPQUOTA])
2528 return vfs_quota_on(sb, type, format_id, path);
2529 err = path_lookup(path, LOOKUP_FOLLOW, &nd);
2530 if (err)
2531 return err;
2532 /* Quotafile not on the same filesystem? */
2533 if (nd.mnt->mnt_sb != sb) {
2534 path_release(&nd);
2535 return -EXDEV;
2536 }
2537 /* Quotafile not of fs root? */
2538 if (nd.dentry->d_parent->d_inode != sb->s_root->d_inode)
2539 printk(KERN_WARNING
2540 "EXT3-fs: Quota file not on filesystem root. "
2541 "Journalled quota will not work.\n");
2542 path_release(&nd);
2543 return vfs_quota_on(sb, type, format_id, path);
2544 }
2545
2546 /* Read data from quotafile - avoid pagecache and such because we cannot afford
2547 * acquiring the locks... As quota files are never truncated and quota code
2548 * itself serializes the operations (and noone else should touch the files)
2549 * we don't have to be afraid of races */
2550 static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data,
2551 size_t len, loff_t off)
2552 {
2553 struct inode *inode = sb_dqopt(sb)->files[type];
2554 sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2555 int err = 0;
2556 int offset = off & (sb->s_blocksize - 1);
2557 int tocopy;
2558 size_t toread;
2559 struct buffer_head *bh;
2560 loff_t i_size = i_size_read(inode);
2561
2562 if (off > i_size)
2563 return 0;
2564 if (off+len > i_size)
2565 len = i_size-off;
2566 toread = len;
2567 while (toread > 0) {
2568 tocopy = sb->s_blocksize - offset < toread ?
2569 sb->s_blocksize - offset : toread;
2570 bh = ext3_bread(NULL, inode, blk, 0, &err);
2571 if (err)
2572 return err;
2573 if (!bh) /* A hole? */
2574 memset(data, 0, tocopy);
2575 else
2576 memcpy(data, bh->b_data+offset, tocopy);
2577 brelse(bh);
2578 offset = 0;
2579 toread -= tocopy;
2580 data += tocopy;
2581 blk++;
2582 }
2583 return len;
2584 }
2585
2586 /* Write to quotafile (we know the transaction is already started and has
2587 * enough credits) */
2588 static ssize_t ext3_quota_write(struct super_block *sb, int type,
2589 const char *data, size_t len, loff_t off)
2590 {
2591 struct inode *inode = sb_dqopt(sb)->files[type];
2592 sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb);
2593 int err = 0;
2594 int offset = off & (sb->s_blocksize - 1);
2595 int tocopy;
2596 int journal_quota = EXT3_SB(sb)->s_qf_names[type] != NULL;
2597 size_t towrite = len;
2598 struct buffer_head *bh;
2599 handle_t *handle = journal_current_handle();
2600
2601 mutex_lock(&inode->i_mutex);
2602 while (towrite > 0) {
2603 tocopy = sb->s_blocksize - offset < towrite ?
2604 sb->s_blocksize - offset : towrite;
2605 bh = ext3_bread(handle, inode, blk, 1, &err);
2606 if (!bh)
2607 goto out;
2608 if (journal_quota) {
2609 err = ext3_journal_get_write_access(handle, bh);
2610 if (err) {
2611 brelse(bh);
2612 goto out;
2613 }
2614 }
2615 lock_buffer(bh);
2616 memcpy(bh->b_data+offset, data, tocopy);
2617 flush_dcache_page(bh->b_page);
2618 unlock_buffer(bh);
2619 if (journal_quota)
2620 err = ext3_journal_dirty_metadata(handle, bh);
2621 else {
2622 /* Always do at least ordered writes for quotas */
2623 err = ext3_journal_dirty_data(handle, bh);
2624 mark_buffer_dirty(bh);
2625 }
2626 brelse(bh);
2627 if (err)
2628 goto out;
2629 offset = 0;
2630 towrite -= tocopy;
2631 data += tocopy;
2632 blk++;
2633 }
2634 out:
2635 if (len == towrite)
2636 return err;
2637 if (inode->i_size < off+len-towrite) {
2638 i_size_write(inode, off+len-towrite);
2639 EXT3_I(inode)->i_disksize = inode->i_size;
2640 }
2641 inode->i_version++;
2642 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
2643 ext3_mark_inode_dirty(handle, inode);
2644 mutex_unlock(&inode->i_mutex);
2645 return len - towrite;
2646 }
2647
2648 #endif
2649
2650 static int ext3_get_sb(struct file_system_type *fs_type,
2651 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
2652 {
2653 return get_sb_bdev(fs_type, flags, dev_name, data, ext3_fill_super, mnt);
2654 }
2655
2656 static struct file_system_type ext3_fs_type = {
2657 .owner = THIS_MODULE,
2658 .name = "ext3",
2659 .get_sb = ext3_get_sb,
2660 .kill_sb = kill_block_super,
2661 .fs_flags = FS_REQUIRES_DEV,
2662 };
2663
2664 static int __init init_ext3_fs(void)
2665 {
2666 int err = init_ext3_xattr();
2667 if (err)
2668 return err;
2669 err = init_inodecache();
2670 if (err)
2671 goto out1;
2672 err = register_filesystem(&ext3_fs_type);
2673 if (err)
2674 goto out;
2675 return 0;
2676 out:
2677 destroy_inodecache();
2678 out1:
2679 exit_ext3_xattr();
2680 return err;
2681 }
2682
2683 static void __exit exit_ext3_fs(void)
2684 {
2685 unregister_filesystem(&ext3_fs_type);
2686 destroy_inodecache();
2687 exit_ext3_xattr();
2688 }
2689
2690 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
2691 MODULE_DESCRIPTION("Second Extended Filesystem with journaling extensions");
2692 MODULE_LICENSE("GPL");
2693 module_init(init_ext3_fs)
2694 module_exit(exit_ext3_fs)
kernel source for telekom puls (alcatel/mediatek)