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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/module.h> |
20 | #include <linux/string.h> |
21 | #include <linux/fs.h> |
22 | #include <linux/time.h> |
23 | #include <linux/jbd.h> |
24 | #include <linux/ext3_fs.h> |
25 | #include <linux/ext3_jbd.h> |
26 | #include <linux/slab.h> |
27 | #include <linux/init.h> |
28 | #include <linux/blkdev.h> |
29 | #include <linux/parser.h> |
30 | #include <linux/buffer_head.h> |
31 | #include <linux/exportfs.h> |
32 | #include <linux/vfs.h> |
33 | #include <linux/random.h> |
34 | #include <linux/mount.h> |
35 | #include <linux/namei.h> |
36 | #include <linux/quotaops.h> |
37 | #include <linux/seq_file.h> |
38 | #include <linux/log2.h> |
39 | #include <linux/cleancache.h> |
40 | |
41 | #include <asm/uaccess.h> |
42 | |
43 | #include "xattr.h" |
44 | #include "acl.h" |
45 | #include "namei.h" |
46 | |
47 | #ifdef CONFIG_EXT3_DEFAULTS_TO_ORDERED |
48 | #define EXT3_MOUNT_DEFAULT_DATA_MODE EXT3_MOUNT_ORDERED_DATA |
49 | #else |
50 | #define EXT3_MOUNT_DEFAULT_DATA_MODE EXT3_MOUNT_WRITEBACK_DATA |
51 | #endif |
52 | |
53 | static int ext3_load_journal(struct super_block *, struct ext3_super_block *, |
54 | unsigned long journal_devnum); |
55 | static int ext3_create_journal(struct super_block *, struct ext3_super_block *, |
56 | unsigned int); |
57 | static int ext3_commit_super(struct super_block *sb, |
58 | struct ext3_super_block *es, |
59 | int sync); |
60 | static void ext3_mark_recovery_complete(struct super_block * sb, |
61 | struct ext3_super_block * es); |
62 | static void ext3_clear_journal_err(struct super_block * sb, |
63 | struct ext3_super_block * es); |
64 | static int ext3_sync_fs(struct super_block *sb, int wait); |
65 | static const char *ext3_decode_error(struct super_block * sb, int errno, |
66 | char nbuf[16]); |
67 | static int ext3_remount (struct super_block * sb, int * flags, char * data); |
68 | static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf); |
69 | static int ext3_unfreeze(struct super_block *sb); |
70 | static int ext3_freeze(struct super_block *sb); |
71 | |
72 | /* |
73 | * Wrappers for journal_start/end. |
74 | * |
75 | * The only special thing we need to do here is to make sure that all |
76 | * journal_end calls result in the superblock being marked dirty, so |
77 | * that sync() will call the filesystem's write_super callback if |
78 | * appropriate. |
79 | */ |
80 | handle_t *ext3_journal_start_sb(struct super_block *sb, int nblocks) |
81 | { |
82 | journal_t *journal; |
83 | |
84 | if (sb->s_flags & MS_RDONLY) |
85 | return ERR_PTR(-EROFS); |
86 | |
87 | /* Special case here: if the journal has aborted behind our |
88 | * backs (eg. EIO in the commit thread), then we still need to |
89 | * take the FS itself readonly cleanly. */ |
90 | journal = EXT3_SB(sb)->s_journal; |
91 | if (is_journal_aborted(journal)) { |
92 | ext3_abort(sb, __func__, |
93 | "Detected aborted journal"); |
94 | return ERR_PTR(-EROFS); |
95 | } |
96 | |
97 | return journal_start(journal, nblocks); |
98 | } |
99 | |
100 | /* |
101 | * The only special thing we need to do here is to make sure that all |
102 | * journal_stop calls result in the superblock being marked dirty, so |
103 | * that sync() will call the filesystem's write_super callback if |
104 | * appropriate. |
105 | */ |
106 | int __ext3_journal_stop(const char *where, handle_t *handle) |
107 | { |
108 | struct super_block *sb; |
109 | int err; |
110 | int rc; |
111 | |
112 | sb = handle->h_transaction->t_journal->j_private; |
113 | err = handle->h_err; |
114 | rc = journal_stop(handle); |
115 | |
116 | if (!err) |
117 | err = rc; |
118 | if (err) |
119 | __ext3_std_error(sb, where, err); |
120 | return err; |
121 | } |
122 | |
123 | void ext3_journal_abort_handle(const char *caller, const char *err_fn, |
124 | struct buffer_head *bh, handle_t *handle, int err) |
125 | { |
126 | char nbuf[16]; |
127 | const char *errstr = ext3_decode_error(NULL, err, nbuf); |
128 | |
129 | if (bh) |
130 | BUFFER_TRACE(bh, "abort"); |
131 | |
132 | if (!handle->h_err) |
133 | handle->h_err = err; |
134 | |
135 | if (is_handle_aborted(handle)) |
136 | return; |
137 | |
138 | printk(KERN_ERR "EXT3-fs: %s: aborting transaction: %s in %s\n", |
139 | caller, errstr, err_fn); |
140 | |
141 | journal_abort_handle(handle); |
142 | } |
143 | |
144 | void ext3_msg(struct super_block *sb, const char *prefix, |
145 | const char *fmt, ...) |
146 | { |
147 | struct va_format vaf; |
148 | va_list args; |
149 | |
150 | va_start(args, fmt); |
151 | |
152 | vaf.fmt = fmt; |
153 | vaf.va = &args; |
154 | |
155 | printk("%sEXT3-fs (%s): %pV\n", prefix, sb->s_id, &vaf); |
156 | |
157 | va_end(args); |
158 | } |
159 | |
160 | /* Deal with the reporting of failure conditions on a filesystem such as |
161 | * inconsistencies detected or read IO failures. |
162 | * |
163 | * On ext2, we can store the error state of the filesystem in the |
164 | * superblock. That is not possible on ext3, because we may have other |
165 | * write ordering constraints on the superblock which prevent us from |
166 | * writing it out straight away; and given that the journal is about to |
167 | * be aborted, we can't rely on the current, or future, transactions to |
168 | * write out the superblock safely. |
169 | * |
170 | * We'll just use the journal_abort() error code to record an error in |
171 | * the journal instead. On recovery, the journal will complain about |
172 | * that error until we've noted it down and cleared it. |
173 | */ |
174 | |
175 | static void ext3_handle_error(struct super_block *sb) |
176 | { |
177 | struct ext3_super_block *es = EXT3_SB(sb)->s_es; |
178 | |
179 | EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS; |
180 | es->s_state |= cpu_to_le16(EXT3_ERROR_FS); |
181 | |
182 | if (sb->s_flags & MS_RDONLY) |
183 | return; |
184 | |
185 | if (!test_opt (sb, ERRORS_CONT)) { |
186 | journal_t *journal = EXT3_SB(sb)->s_journal; |
187 | |
188 | set_opt(EXT3_SB(sb)->s_mount_opt, ABORT); |
189 | if (journal) |
190 | journal_abort(journal, -EIO); |
191 | } |
192 | if (test_opt (sb, ERRORS_RO)) { |
193 | ext3_msg(sb, KERN_CRIT, |
194 | "error: remounting filesystem read-only"); |
195 | sb->s_flags |= MS_RDONLY; |
196 | } |
197 | ext3_commit_super(sb, es, 1); |
198 | if (test_opt(sb, ERRORS_PANIC)) |
199 | panic("EXT3-fs (%s): panic forced after error\n", |
200 | sb->s_id); |
201 | } |
202 | |
203 | void ext3_error(struct super_block *sb, const char *function, |
204 | const char *fmt, ...) |
205 | { |
206 | struct va_format vaf; |
207 | va_list args; |
208 | |
209 | va_start(args, fmt); |
210 | |
211 | vaf.fmt = fmt; |
212 | vaf.va = &args; |
213 | |
214 | printk(KERN_CRIT "EXT3-fs error (device %s): %s: %pV\n", |
215 | sb->s_id, function, &vaf); |
216 | |
217 | va_end(args); |
218 | |
219 | ext3_handle_error(sb); |
220 | } |
221 | |
222 | static const char *ext3_decode_error(struct super_block * sb, int errno, |
223 | char nbuf[16]) |
224 | { |
225 | char *errstr = NULL; |
226 | |
227 | switch (errno) { |
228 | case -EIO: |
229 | errstr = "IO failure"; |
230 | break; |
231 | case -ENOMEM: |
232 | errstr = "Out of memory"; |
233 | break; |
234 | case -EROFS: |
235 | if (!sb || EXT3_SB(sb)->s_journal->j_flags & JFS_ABORT) |
236 | errstr = "Journal has aborted"; |
237 | else |
238 | errstr = "Readonly filesystem"; |
239 | break; |
240 | default: |
241 | /* If the caller passed in an extra buffer for unknown |
242 | * errors, textualise them now. Else we just return |
243 | * NULL. */ |
244 | if (nbuf) { |
245 | /* Check for truncated error codes... */ |
246 | if (snprintf(nbuf, 16, "error %d", -errno) >= 0) |
247 | errstr = nbuf; |
248 | } |
249 | break; |
250 | } |
251 | |
252 | return errstr; |
253 | } |
254 | |
255 | /* __ext3_std_error decodes expected errors from journaling functions |
256 | * automatically and invokes the appropriate error response. */ |
257 | |
258 | void __ext3_std_error (struct super_block * sb, const char * function, |
259 | int errno) |
260 | { |
261 | char nbuf[16]; |
262 | const char *errstr; |
263 | |
264 | /* Special case: if the error is EROFS, and we're not already |
265 | * inside a transaction, then there's really no point in logging |
266 | * an error. */ |
267 | if (errno == -EROFS && journal_current_handle() == NULL && |
268 | (sb->s_flags & MS_RDONLY)) |
269 | return; |
270 | |
271 | errstr = ext3_decode_error(sb, errno, nbuf); |
272 | ext3_msg(sb, KERN_CRIT, "error in %s: %s", function, errstr); |
273 | |
274 | ext3_handle_error(sb); |
275 | } |
276 | |
277 | /* |
278 | * ext3_abort is a much stronger failure handler than ext3_error. The |
279 | * abort function may be used to deal with unrecoverable failures such |
280 | * as journal IO errors or ENOMEM at a critical moment in log management. |
281 | * |
282 | * We unconditionally force the filesystem into an ABORT|READONLY state, |
283 | * unless the error response on the fs has been set to panic in which |
284 | * case we take the easy way out and panic immediately. |
285 | */ |
286 | |
287 | void ext3_abort(struct super_block *sb, const char *function, |
288 | const char *fmt, ...) |
289 | { |
290 | struct va_format vaf; |
291 | va_list args; |
292 | |
293 | va_start(args, fmt); |
294 | |
295 | vaf.fmt = fmt; |
296 | vaf.va = &args; |
297 | |
298 | printk(KERN_CRIT "EXT3-fs (%s): error: %s: %pV\n", |
299 | sb->s_id, function, &vaf); |
300 | |
301 | va_end(args); |
302 | |
303 | if (test_opt(sb, ERRORS_PANIC)) |
304 | panic("EXT3-fs: panic from previous error\n"); |
305 | |
306 | if (sb->s_flags & MS_RDONLY) |
307 | return; |
308 | |
309 | ext3_msg(sb, KERN_CRIT, |
310 | "error: remounting filesystem read-only"); |
311 | EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS; |
312 | sb->s_flags |= MS_RDONLY; |
313 | set_opt(EXT3_SB(sb)->s_mount_opt, ABORT); |
314 | if (EXT3_SB(sb)->s_journal) |
315 | journal_abort(EXT3_SB(sb)->s_journal, -EIO); |
316 | } |
317 | |
318 | void ext3_warning(struct super_block *sb, const char *function, |
319 | const char *fmt, ...) |
320 | { |
321 | struct va_format vaf; |
322 | va_list args; |
323 | |
324 | va_start(args, fmt); |
325 | |
326 | vaf.fmt = fmt; |
327 | vaf.va = &args; |
328 | |
329 | printk(KERN_WARNING "EXT3-fs (%s): warning: %s: %pV\n", |
330 | sb->s_id, function, &vaf); |
331 | |
332 | va_end(args); |
333 | } |
334 | |
335 | void ext3_update_dynamic_rev(struct super_block *sb) |
336 | { |
337 | struct ext3_super_block *es = EXT3_SB(sb)->s_es; |
338 | |
339 | if (le32_to_cpu(es->s_rev_level) > EXT3_GOOD_OLD_REV) |
340 | return; |
341 | |
342 | ext3_msg(sb, KERN_WARNING, |
343 | "warning: updating to rev %d because of " |
344 | "new feature flag, running e2fsck is recommended", |
345 | EXT3_DYNAMIC_REV); |
346 | |
347 | es->s_first_ino = cpu_to_le32(EXT3_GOOD_OLD_FIRST_INO); |
348 | es->s_inode_size = cpu_to_le16(EXT3_GOOD_OLD_INODE_SIZE); |
349 | es->s_rev_level = cpu_to_le32(EXT3_DYNAMIC_REV); |
350 | /* leave es->s_feature_*compat flags alone */ |
351 | /* es->s_uuid will be set by e2fsck if empty */ |
352 | |
353 | /* |
354 | * The rest of the superblock fields should be zero, and if not it |
355 | * means they are likely already in use, so leave them alone. We |
356 | * can leave it up to e2fsck to clean up any inconsistencies there. |
357 | */ |
358 | } |
359 | |
360 | /* |
361 | * Open the external journal device |
362 | */ |
363 | static struct block_device *ext3_blkdev_get(dev_t dev, struct super_block *sb) |
364 | { |
365 | struct block_device *bdev; |
366 | char b[BDEVNAME_SIZE]; |
367 | |
368 | bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb); |
369 | if (IS_ERR(bdev)) |
370 | goto fail; |
371 | return bdev; |
372 | |
373 | fail: |
374 | ext3_msg(sb, "error: failed to open journal device %s: %ld", |
375 | __bdevname(dev, b), PTR_ERR(bdev)); |
376 | |
377 | return NULL; |
378 | } |
379 | |
380 | /* |
381 | * Release the journal device |
382 | */ |
383 | static int ext3_blkdev_put(struct block_device *bdev) |
384 | { |
385 | return blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL); |
386 | } |
387 | |
388 | static int ext3_blkdev_remove(struct ext3_sb_info *sbi) |
389 | { |
390 | struct block_device *bdev; |
391 | int ret = -ENODEV; |
392 | |
393 | bdev = sbi->journal_bdev; |
394 | if (bdev) { |
395 | ret = ext3_blkdev_put(bdev); |
396 | sbi->journal_bdev = NULL; |
397 | } |
398 | return ret; |
399 | } |
400 | |
401 | static inline struct inode *orphan_list_entry(struct list_head *l) |
402 | { |
403 | return &list_entry(l, struct ext3_inode_info, i_orphan)->vfs_inode; |
404 | } |
405 | |
406 | static void dump_orphan_list(struct super_block *sb, struct ext3_sb_info *sbi) |
407 | { |
408 | struct list_head *l; |
409 | |
410 | ext3_msg(sb, KERN_ERR, "error: sb orphan head is %d", |
411 | le32_to_cpu(sbi->s_es->s_last_orphan)); |
412 | |
413 | ext3_msg(sb, KERN_ERR, "sb_info orphan list:"); |
414 | list_for_each(l, &sbi->s_orphan) { |
415 | struct inode *inode = orphan_list_entry(l); |
416 | ext3_msg(sb, KERN_ERR, " " |
417 | "inode %s:%lu at %p: mode %o, nlink %d, next %d\n", |
418 | inode->i_sb->s_id, inode->i_ino, inode, |
419 | inode->i_mode, inode->i_nlink, |
420 | NEXT_ORPHAN(inode)); |
421 | } |
422 | } |
423 | |
424 | static void ext3_put_super (struct super_block * sb) |
425 | { |
426 | struct ext3_sb_info *sbi = EXT3_SB(sb); |
427 | struct ext3_super_block *es = sbi->s_es; |
428 | int i, err; |
429 | |
430 | dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); |
431 | ext3_xattr_put_super(sb); |
432 | err = journal_destroy(sbi->s_journal); |
433 | sbi->s_journal = NULL; |
434 | if (err < 0) |
435 | ext3_abort(sb, __func__, "Couldn't clean up the journal"); |
436 | |
437 | if (!(sb->s_flags & MS_RDONLY)) { |
438 | EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER); |
439 | es->s_state = cpu_to_le16(sbi->s_mount_state); |
440 | BUFFER_TRACE(sbi->s_sbh, "marking dirty"); |
441 | mark_buffer_dirty(sbi->s_sbh); |
442 | ext3_commit_super(sb, es, 1); |
443 | } |
444 | |
445 | for (i = 0; i < sbi->s_gdb_count; i++) |
446 | brelse(sbi->s_group_desc[i]); |
447 | kfree(sbi->s_group_desc); |
448 | percpu_counter_destroy(&sbi->s_freeblocks_counter); |
449 | percpu_counter_destroy(&sbi->s_freeinodes_counter); |
450 | percpu_counter_destroy(&sbi->s_dirs_counter); |
451 | brelse(sbi->s_sbh); |
452 | #ifdef CONFIG_QUOTA |
453 | for (i = 0; i < MAXQUOTAS; i++) |
454 | kfree(sbi->s_qf_names[i]); |
455 | #endif |
456 | |
457 | /* Debugging code just in case the in-memory inode orphan list |
458 | * isn't empty. The on-disk one can be non-empty if we've |
459 | * detected an error and taken the fs readonly, but the |
460 | * in-memory list had better be clean by this point. */ |
461 | if (!list_empty(&sbi->s_orphan)) |
462 | dump_orphan_list(sb, sbi); |
463 | J_ASSERT(list_empty(&sbi->s_orphan)); |
464 | |
465 | invalidate_bdev(sb->s_bdev); |
466 | if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) { |
467 | /* |
468 | * Invalidate the journal device's buffers. We don't want them |
469 | * floating about in memory - the physical journal device may |
470 | * hotswapped, and it breaks the `ro-after' testing code. |
471 | */ |
472 | sync_blockdev(sbi->journal_bdev); |
473 | invalidate_bdev(sbi->journal_bdev); |
474 | ext3_blkdev_remove(sbi); |
475 | } |
476 | sb->s_fs_info = NULL; |
477 | kfree(sbi->s_blockgroup_lock); |
478 | kfree(sbi); |
479 | } |
480 | |
481 | static struct kmem_cache *ext3_inode_cachep; |
482 | |
483 | /* |
484 | * Called inside transaction, so use GFP_NOFS |
485 | */ |
486 | static struct inode *ext3_alloc_inode(struct super_block *sb) |
487 | { |
488 | struct ext3_inode_info *ei; |
489 | |
490 | ei = kmem_cache_alloc(ext3_inode_cachep, GFP_NOFS); |
491 | if (!ei) |
492 | return NULL; |
493 | ei->i_block_alloc_info = NULL; |
494 | ei->vfs_inode.i_version = 1; |
495 | atomic_set(&ei->i_datasync_tid, 0); |
496 | atomic_set(&ei->i_sync_tid, 0); |
497 | return &ei->vfs_inode; |
498 | } |
499 | |
500 | static void ext3_i_callback(struct rcu_head *head) |
501 | { |
502 | struct inode *inode = container_of(head, struct inode, i_rcu); |
503 | INIT_LIST_HEAD(&inode->i_dentry); |
504 | kmem_cache_free(ext3_inode_cachep, EXT3_I(inode)); |
505 | } |
506 | |
507 | static void ext3_destroy_inode(struct inode *inode) |
508 | { |
509 | if (!list_empty(&(EXT3_I(inode)->i_orphan))) { |
510 | printk("EXT3 Inode %p: orphan list check failed!\n", |
511 | EXT3_I(inode)); |
512 | print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4, |
513 | EXT3_I(inode), sizeof(struct ext3_inode_info), |
514 | false); |
515 | dump_stack(); |
516 | } |
517 | call_rcu(&inode->i_rcu, ext3_i_callback); |
518 | } |
519 | |
520 | static void init_once(void *foo) |
521 | { |
522 | struct ext3_inode_info *ei = (struct ext3_inode_info *) foo; |
523 | |
524 | INIT_LIST_HEAD(&ei->i_orphan); |
525 | #ifdef CONFIG_EXT3_FS_XATTR |
526 | init_rwsem(&ei->xattr_sem); |
527 | #endif |
528 | mutex_init(&ei->truncate_mutex); |
529 | inode_init_once(&ei->vfs_inode); |
530 | } |
531 | |
532 | static int init_inodecache(void) |
533 | { |
534 | ext3_inode_cachep = kmem_cache_create("ext3_inode_cache", |
535 | sizeof(struct ext3_inode_info), |
536 | 0, (SLAB_RECLAIM_ACCOUNT| |
537 | SLAB_MEM_SPREAD), |
538 | init_once); |
539 | if (ext3_inode_cachep == NULL) |
540 | return -ENOMEM; |
541 | return 0; |
542 | } |
543 | |
544 | static void destroy_inodecache(void) |
545 | { |
546 | kmem_cache_destroy(ext3_inode_cachep); |
547 | } |
548 | |
549 | static inline void ext3_show_quota_options(struct seq_file *seq, struct super_block *sb) |
550 | { |
551 | #if defined(CONFIG_QUOTA) |
552 | struct ext3_sb_info *sbi = EXT3_SB(sb); |
553 | |
554 | if (sbi->s_jquota_fmt) { |
555 | char *fmtname = ""; |
556 | |
557 | switch (sbi->s_jquota_fmt) { |
558 | case QFMT_VFS_OLD: |
559 | fmtname = "vfsold"; |
560 | break; |
561 | case QFMT_VFS_V0: |
562 | fmtname = "vfsv0"; |
563 | break; |
564 | case QFMT_VFS_V1: |
565 | fmtname = "vfsv1"; |
566 | break; |
567 | } |
568 | seq_printf(seq, ",jqfmt=%s", fmtname); |
569 | } |
570 | |
571 | if (sbi->s_qf_names[USRQUOTA]) |
572 | seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]); |
573 | |
574 | if (sbi->s_qf_names[GRPQUOTA]) |
575 | seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]); |
576 | |
577 | if (test_opt(sb, USRQUOTA)) |
578 | seq_puts(seq, ",usrquota"); |
579 | |
580 | if (test_opt(sb, GRPQUOTA)) |
581 | seq_puts(seq, ",grpquota"); |
582 | #endif |
583 | } |
584 | |
585 | static char *data_mode_string(unsigned long mode) |
586 | { |
587 | switch (mode) { |
588 | case EXT3_MOUNT_JOURNAL_DATA: |
589 | return "journal"; |
590 | case EXT3_MOUNT_ORDERED_DATA: |
591 | return "ordered"; |
592 | case EXT3_MOUNT_WRITEBACK_DATA: |
593 | return "writeback"; |
594 | } |
595 | return "unknown"; |
596 | } |
597 | |
598 | /* |
599 | * Show an option if |
600 | * - it's set to a non-default value OR |
601 | * - if the per-sb default is different from the global default |
602 | */ |
603 | static int ext3_show_options(struct seq_file *seq, struct vfsmount *vfs) |
604 | { |
605 | struct super_block *sb = vfs->mnt_sb; |
606 | struct ext3_sb_info *sbi = EXT3_SB(sb); |
607 | struct ext3_super_block *es = sbi->s_es; |
608 | unsigned long def_mount_opts; |
609 | |
610 | def_mount_opts = le32_to_cpu(es->s_default_mount_opts); |
611 | |
612 | if (sbi->s_sb_block != 1) |
613 | seq_printf(seq, ",sb=%lu", sbi->s_sb_block); |
614 | if (test_opt(sb, MINIX_DF)) |
615 | seq_puts(seq, ",minixdf"); |
616 | if (test_opt(sb, GRPID)) |
617 | seq_puts(seq, ",grpid"); |
618 | if (!test_opt(sb, GRPID) && (def_mount_opts & EXT3_DEFM_BSDGROUPS)) |
619 | seq_puts(seq, ",nogrpid"); |
620 | if (sbi->s_resuid != EXT3_DEF_RESUID || |
621 | le16_to_cpu(es->s_def_resuid) != EXT3_DEF_RESUID) { |
622 | seq_printf(seq, ",resuid=%u", sbi->s_resuid); |
623 | } |
624 | if (sbi->s_resgid != EXT3_DEF_RESGID || |
625 | le16_to_cpu(es->s_def_resgid) != EXT3_DEF_RESGID) { |
626 | seq_printf(seq, ",resgid=%u", sbi->s_resgid); |
627 | } |
628 | if (test_opt(sb, ERRORS_RO)) { |
629 | int def_errors = le16_to_cpu(es->s_errors); |
630 | |
631 | if (def_errors == EXT3_ERRORS_PANIC || |
632 | def_errors == EXT3_ERRORS_CONTINUE) { |
633 | seq_puts(seq, ",errors=remount-ro"); |
634 | } |
635 | } |
636 | if (test_opt(sb, ERRORS_CONT)) |
637 | seq_puts(seq, ",errors=continue"); |
638 | if (test_opt(sb, ERRORS_PANIC)) |
639 | seq_puts(seq, ",errors=panic"); |
640 | if (test_opt(sb, NO_UID32)) |
641 | seq_puts(seq, ",nouid32"); |
642 | if (test_opt(sb, DEBUG)) |
643 | seq_puts(seq, ",debug"); |
644 | if (test_opt(sb, OLDALLOC)) |
645 | seq_puts(seq, ",oldalloc"); |
646 | #ifdef CONFIG_EXT3_FS_XATTR |
647 | if (test_opt(sb, XATTR_USER)) |
648 | seq_puts(seq, ",user_xattr"); |
649 | if (!test_opt(sb, XATTR_USER) && |
650 | (def_mount_opts & EXT3_DEFM_XATTR_USER)) { |
651 | seq_puts(seq, ",nouser_xattr"); |
652 | } |
653 | #endif |
654 | #ifdef CONFIG_EXT3_FS_POSIX_ACL |
655 | if (test_opt(sb, POSIX_ACL)) |
656 | seq_puts(seq, ",acl"); |
657 | if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT3_DEFM_ACL)) |
658 | seq_puts(seq, ",noacl"); |
659 | #endif |
660 | if (!test_opt(sb, RESERVATION)) |
661 | seq_puts(seq, ",noreservation"); |
662 | if (sbi->s_commit_interval) { |
663 | seq_printf(seq, ",commit=%u", |
664 | (unsigned) (sbi->s_commit_interval / HZ)); |
665 | } |
666 | |
667 | /* |
668 | * Always display barrier state so it's clear what the status is. |
669 | */ |
670 | seq_puts(seq, ",barrier="); |
671 | seq_puts(seq, test_opt(sb, BARRIER) ? "1" : "0"); |
672 | seq_printf(seq, ",data=%s", data_mode_string(test_opt(sb, DATA_FLAGS))); |
673 | if (test_opt(sb, DATA_ERR_ABORT)) |
674 | seq_puts(seq, ",data_err=abort"); |
675 | |
676 | if (test_opt(sb, NOLOAD)) |
677 | seq_puts(seq, ",norecovery"); |
678 | |
679 | ext3_show_quota_options(seq, sb); |
680 | |
681 | return 0; |
682 | } |
683 | |
684 | |
685 | static struct inode *ext3_nfs_get_inode(struct super_block *sb, |
686 | u64 ino, u32 generation) |
687 | { |
688 | struct inode *inode; |
689 | |
690 | if (ino < EXT3_FIRST_INO(sb) && ino != EXT3_ROOT_INO) |
691 | return ERR_PTR(-ESTALE); |
692 | if (ino > le32_to_cpu(EXT3_SB(sb)->s_es->s_inodes_count)) |
693 | return ERR_PTR(-ESTALE); |
694 | |
695 | /* iget isn't really right if the inode is currently unallocated!! |
696 | * |
697 | * ext3_read_inode will return a bad_inode if the inode had been |
698 | * deleted, so we should be safe. |
699 | * |
700 | * Currently we don't know the generation for parent directory, so |
701 | * a generation of 0 means "accept any" |
702 | */ |
703 | inode = ext3_iget(sb, ino); |
704 | if (IS_ERR(inode)) |
705 | return ERR_CAST(inode); |
706 | if (generation && inode->i_generation != generation) { |
707 | iput(inode); |
708 | return ERR_PTR(-ESTALE); |
709 | } |
710 | |
711 | return inode; |
712 | } |
713 | |
714 | static struct dentry *ext3_fh_to_dentry(struct super_block *sb, struct fid *fid, |
715 | int fh_len, int fh_type) |
716 | { |
717 | return generic_fh_to_dentry(sb, fid, fh_len, fh_type, |
718 | ext3_nfs_get_inode); |
719 | } |
720 | |
721 | static struct dentry *ext3_fh_to_parent(struct super_block *sb, struct fid *fid, |
722 | int fh_len, int fh_type) |
723 | { |
724 | return generic_fh_to_parent(sb, fid, fh_len, fh_type, |
725 | ext3_nfs_get_inode); |
726 | } |
727 | |
728 | /* |
729 | * Try to release metadata pages (indirect blocks, directories) which are |
730 | * mapped via the block device. Since these pages could have journal heads |
731 | * which would prevent try_to_free_buffers() from freeing them, we must use |
732 | * jbd layer's try_to_free_buffers() function to release them. |
733 | */ |
734 | static int bdev_try_to_free_page(struct super_block *sb, struct page *page, |
735 | gfp_t wait) |
736 | { |
737 | journal_t *journal = EXT3_SB(sb)->s_journal; |
738 | |
739 | WARN_ON(PageChecked(page)); |
740 | if (!page_has_buffers(page)) |
741 | return 0; |
742 | if (journal) |
743 | return journal_try_to_free_buffers(journal, page, |
744 | wait & ~__GFP_WAIT); |
745 | return try_to_free_buffers(page); |
746 | } |
747 | |
748 | #ifdef CONFIG_QUOTA |
749 | #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group") |
750 | #define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA)) |
751 | |
752 | static int ext3_write_dquot(struct dquot *dquot); |
753 | static int ext3_acquire_dquot(struct dquot *dquot); |
754 | static int ext3_release_dquot(struct dquot *dquot); |
755 | static int ext3_mark_dquot_dirty(struct dquot *dquot); |
756 | static int ext3_write_info(struct super_block *sb, int type); |
757 | static int ext3_quota_on(struct super_block *sb, int type, int format_id, |
758 | struct path *path); |
759 | static int ext3_quota_on_mount(struct super_block *sb, int type); |
760 | static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data, |
761 | size_t len, loff_t off); |
762 | static ssize_t ext3_quota_write(struct super_block *sb, int type, |
763 | const char *data, size_t len, loff_t off); |
764 | |
765 | static const struct dquot_operations ext3_quota_operations = { |
766 | .write_dquot = ext3_write_dquot, |
767 | .acquire_dquot = ext3_acquire_dquot, |
768 | .release_dquot = ext3_release_dquot, |
769 | .mark_dirty = ext3_mark_dquot_dirty, |
770 | .write_info = ext3_write_info, |
771 | .alloc_dquot = dquot_alloc, |
772 | .destroy_dquot = dquot_destroy, |
773 | }; |
774 | |
775 | static const struct quotactl_ops ext3_qctl_operations = { |
776 | .quota_on = ext3_quota_on, |
777 | .quota_off = dquot_quota_off, |
778 | .quota_sync = dquot_quota_sync, |
779 | .get_info = dquot_get_dqinfo, |
780 | .set_info = dquot_set_dqinfo, |
781 | .get_dqblk = dquot_get_dqblk, |
782 | .set_dqblk = dquot_set_dqblk |
783 | }; |
784 | #endif |
785 | |
786 | static const struct super_operations ext3_sops = { |
787 | .alloc_inode = ext3_alloc_inode, |
788 | .destroy_inode = ext3_destroy_inode, |
789 | .write_inode = ext3_write_inode, |
790 | .dirty_inode = ext3_dirty_inode, |
791 | .evict_inode = ext3_evict_inode, |
792 | .put_super = ext3_put_super, |
793 | .sync_fs = ext3_sync_fs, |
794 | .freeze_fs = ext3_freeze, |
795 | .unfreeze_fs = ext3_unfreeze, |
796 | .statfs = ext3_statfs, |
797 | .remount_fs = ext3_remount, |
798 | .show_options = ext3_show_options, |
799 | #ifdef CONFIG_QUOTA |
800 | .quota_read = ext3_quota_read, |
801 | .quota_write = ext3_quota_write, |
802 | #endif |
803 | .bdev_try_to_free_page = bdev_try_to_free_page, |
804 | }; |
805 | |
806 | static const struct export_operations ext3_export_ops = { |
807 | .fh_to_dentry = ext3_fh_to_dentry, |
808 | .fh_to_parent = ext3_fh_to_parent, |
809 | .get_parent = ext3_get_parent, |
810 | }; |
811 | |
812 | enum { |
813 | Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid, |
814 | Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro, |
815 | Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov, |
816 | Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl, |
817 | Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh, |
818 | Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev, |
819 | Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback, |
820 | Opt_data_err_abort, Opt_data_err_ignore, |
821 | Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota, |
822 | Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota, |
823 | Opt_noquota, Opt_ignore, Opt_barrier, Opt_nobarrier, Opt_err, |
824 | Opt_resize, Opt_usrquota, Opt_grpquota |
825 | }; |
826 | |
827 | static const match_table_t tokens = { |
828 | {Opt_bsd_df, "bsddf"}, |
829 | {Opt_minix_df, "minixdf"}, |
830 | {Opt_grpid, "grpid"}, |
831 | {Opt_grpid, "bsdgroups"}, |
832 | {Opt_nogrpid, "nogrpid"}, |
833 | {Opt_nogrpid, "sysvgroups"}, |
834 | {Opt_resgid, "resgid=%u"}, |
835 | {Opt_resuid, "resuid=%u"}, |
836 | {Opt_sb, "sb=%u"}, |
837 | {Opt_err_cont, "errors=continue"}, |
838 | {Opt_err_panic, "errors=panic"}, |
839 | {Opt_err_ro, "errors=remount-ro"}, |
840 | {Opt_nouid32, "nouid32"}, |
841 | {Opt_nocheck, "nocheck"}, |
842 | {Opt_nocheck, "check=none"}, |
843 | {Opt_debug, "debug"}, |
844 | {Opt_oldalloc, "oldalloc"}, |
845 | {Opt_orlov, "orlov"}, |
846 | {Opt_user_xattr, "user_xattr"}, |
847 | {Opt_nouser_xattr, "nouser_xattr"}, |
848 | {Opt_acl, "acl"}, |
849 | {Opt_noacl, "noacl"}, |
850 | {Opt_reservation, "reservation"}, |
851 | {Opt_noreservation, "noreservation"}, |
852 | {Opt_noload, "noload"}, |
853 | {Opt_noload, "norecovery"}, |
854 | {Opt_nobh, "nobh"}, |
855 | {Opt_bh, "bh"}, |
856 | {Opt_commit, "commit=%u"}, |
857 | {Opt_journal_update, "journal=update"}, |
858 | {Opt_journal_inum, "journal=%u"}, |
859 | {Opt_journal_dev, "journal_dev=%u"}, |
860 | {Opt_abort, "abort"}, |
861 | {Opt_data_journal, "data=journal"}, |
862 | {Opt_data_ordered, "data=ordered"}, |
863 | {Opt_data_writeback, "data=writeback"}, |
864 | {Opt_data_err_abort, "data_err=abort"}, |
865 | {Opt_data_err_ignore, "data_err=ignore"}, |
866 | {Opt_offusrjquota, "usrjquota="}, |
867 | {Opt_usrjquota, "usrjquota=%s"}, |
868 | {Opt_offgrpjquota, "grpjquota="}, |
869 | {Opt_grpjquota, "grpjquota=%s"}, |
870 | {Opt_jqfmt_vfsold, "jqfmt=vfsold"}, |
871 | {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"}, |
872 | {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"}, |
873 | {Opt_grpquota, "grpquota"}, |
874 | {Opt_noquota, "noquota"}, |
875 | {Opt_quota, "quota"}, |
876 | {Opt_usrquota, "usrquota"}, |
877 | {Opt_barrier, "barrier=%u"}, |
878 | {Opt_barrier, "barrier"}, |
879 | {Opt_nobarrier, "nobarrier"}, |
880 | {Opt_resize, "resize"}, |
881 | {Opt_err, NULL}, |
882 | }; |
883 | |
884 | static ext3_fsblk_t get_sb_block(void **data, struct super_block *sb) |
885 | { |
886 | ext3_fsblk_t sb_block; |
887 | char *options = (char *) *data; |
888 | |
889 | if (!options || strncmp(options, "sb=", 3) != 0) |
890 | return 1; /* Default location */ |
891 | options += 3; |
892 | /*todo: use simple_strtoll with >32bit ext3 */ |
893 | sb_block = simple_strtoul(options, &options, 0); |
894 | if (*options && *options != ',') { |
895 | ext3_msg(sb, "error: invalid sb specification: %s", |
896 | (char *) *data); |
897 | return 1; |
898 | } |
899 | if (*options == ',') |
900 | options++; |
901 | *data = (void *) options; |
902 | return sb_block; |
903 | } |
904 | |
905 | #ifdef CONFIG_QUOTA |
906 | static int set_qf_name(struct super_block *sb, int qtype, substring_t *args) |
907 | { |
908 | struct ext3_sb_info *sbi = EXT3_SB(sb); |
909 | char *qname; |
910 | |
911 | if (sb_any_quota_loaded(sb) && |
912 | !sbi->s_qf_names[qtype]) { |
913 | ext3_msg(sb, KERN_ERR, |
914 | "Cannot change journaled " |
915 | "quota options when quota turned on"); |
916 | return 0; |
917 | } |
918 | qname = match_strdup(args); |
919 | if (!qname) { |
920 | ext3_msg(sb, KERN_ERR, |
921 | "Not enough memory for storing quotafile name"); |
922 | return 0; |
923 | } |
924 | if (sbi->s_qf_names[qtype] && |
925 | strcmp(sbi->s_qf_names[qtype], qname)) { |
926 | ext3_msg(sb, KERN_ERR, |
927 | "%s quota file already specified", QTYPE2NAME(qtype)); |
928 | kfree(qname); |
929 | return 0; |
930 | } |
931 | sbi->s_qf_names[qtype] = qname; |
932 | if (strchr(sbi->s_qf_names[qtype], '/')) { |
933 | ext3_msg(sb, KERN_ERR, |
934 | "quotafile must be on filesystem root"); |
935 | kfree(sbi->s_qf_names[qtype]); |
936 | sbi->s_qf_names[qtype] = NULL; |
937 | return 0; |
938 | } |
939 | set_opt(sbi->s_mount_opt, QUOTA); |
940 | return 1; |
941 | } |
942 | |
943 | static int clear_qf_name(struct super_block *sb, int qtype) { |
944 | |
945 | struct ext3_sb_info *sbi = EXT3_SB(sb); |
946 | |
947 | if (sb_any_quota_loaded(sb) && |
948 | sbi->s_qf_names[qtype]) { |
949 | ext3_msg(sb, KERN_ERR, "Cannot change journaled quota options" |
950 | " when quota turned on"); |
951 | return 0; |
952 | } |
953 | /* |
954 | * The space will be released later when all options are confirmed |
955 | * to be correct |
956 | */ |
957 | sbi->s_qf_names[qtype] = NULL; |
958 | return 1; |
959 | } |
960 | #endif |
961 | |
962 | static int parse_options (char *options, struct super_block *sb, |
963 | unsigned int *inum, unsigned long *journal_devnum, |
964 | ext3_fsblk_t *n_blocks_count, int is_remount) |
965 | { |
966 | struct ext3_sb_info *sbi = EXT3_SB(sb); |
967 | char * p; |
968 | substring_t args[MAX_OPT_ARGS]; |
969 | int data_opt = 0; |
970 | int option; |
971 | #ifdef CONFIG_QUOTA |
972 | int qfmt; |
973 | #endif |
974 | |
975 | if (!options) |
976 | return 1; |
977 | |
978 | while ((p = strsep (&options, ",")) != NULL) { |
979 | int token; |
980 | if (!*p) |
981 | continue; |
982 | /* |
983 | * Initialize args struct so we know whether arg was |
984 | * found; some options take optional arguments. |
985 | */ |
986 | args[0].to = args[0].from = 0; |
987 | token = match_token(p, tokens, args); |
988 | switch (token) { |
989 | case Opt_bsd_df: |
990 | clear_opt (sbi->s_mount_opt, MINIX_DF); |
991 | break; |
992 | case Opt_minix_df: |
993 | set_opt (sbi->s_mount_opt, MINIX_DF); |
994 | break; |
995 | case Opt_grpid: |
996 | set_opt (sbi->s_mount_opt, GRPID); |
997 | break; |
998 | case Opt_nogrpid: |
999 | clear_opt (sbi->s_mount_opt, GRPID); |
1000 | break; |
1001 | case Opt_resuid: |
1002 | if (match_int(&args[0], &option)) |
1003 | return 0; |
1004 | sbi->s_resuid = option; |
1005 | break; |
1006 | case Opt_resgid: |
1007 | if (match_int(&args[0], &option)) |
1008 | return 0; |
1009 | sbi->s_resgid = option; |
1010 | break; |
1011 | case Opt_sb: |
1012 | /* handled by get_sb_block() instead of here */ |
1013 | /* *sb_block = match_int(&args[0]); */ |
1014 | break; |
1015 | case Opt_err_panic: |
1016 | clear_opt (sbi->s_mount_opt, ERRORS_CONT); |
1017 | clear_opt (sbi->s_mount_opt, ERRORS_RO); |
1018 | set_opt (sbi->s_mount_opt, ERRORS_PANIC); |
1019 | break; |
1020 | case Opt_err_ro: |
1021 | clear_opt (sbi->s_mount_opt, ERRORS_CONT); |
1022 | clear_opt (sbi->s_mount_opt, ERRORS_PANIC); |
1023 | set_opt (sbi->s_mount_opt, ERRORS_RO); |
1024 | break; |
1025 | case Opt_err_cont: |
1026 | clear_opt (sbi->s_mount_opt, ERRORS_RO); |
1027 | clear_opt (sbi->s_mount_opt, ERRORS_PANIC); |
1028 | set_opt (sbi->s_mount_opt, ERRORS_CONT); |
1029 | break; |
1030 | case Opt_nouid32: |
1031 | set_opt (sbi->s_mount_opt, NO_UID32); |
1032 | break; |
1033 | case Opt_nocheck: |
1034 | clear_opt (sbi->s_mount_opt, CHECK); |
1035 | break; |
1036 | case Opt_debug: |
1037 | set_opt (sbi->s_mount_opt, DEBUG); |
1038 | break; |
1039 | case Opt_oldalloc: |
1040 | set_opt (sbi->s_mount_opt, OLDALLOC); |
1041 | break; |
1042 | case Opt_orlov: |
1043 | clear_opt (sbi->s_mount_opt, OLDALLOC); |
1044 | break; |
1045 | #ifdef CONFIG_EXT3_FS_XATTR |
1046 | case Opt_user_xattr: |
1047 | set_opt (sbi->s_mount_opt, XATTR_USER); |
1048 | break; |
1049 | case Opt_nouser_xattr: |
1050 | clear_opt (sbi->s_mount_opt, XATTR_USER); |
1051 | break; |
1052 | #else |
1053 | case Opt_user_xattr: |
1054 | case Opt_nouser_xattr: |
1055 | ext3_msg(sb, KERN_INFO, |
1056 | "(no)user_xattr options not supported"); |
1057 | break; |
1058 | #endif |
1059 | #ifdef CONFIG_EXT3_FS_POSIX_ACL |
1060 | case Opt_acl: |
1061 | set_opt(sbi->s_mount_opt, POSIX_ACL); |
1062 | break; |
1063 | case Opt_noacl: |
1064 | clear_opt(sbi->s_mount_opt, POSIX_ACL); |
1065 | break; |
1066 | #else |
1067 | case Opt_acl: |
1068 | case Opt_noacl: |
1069 | ext3_msg(sb, KERN_INFO, |
1070 | "(no)acl options not supported"); |
1071 | break; |
1072 | #endif |
1073 | case Opt_reservation: |
1074 | set_opt(sbi->s_mount_opt, RESERVATION); |
1075 | break; |
1076 | case Opt_noreservation: |
1077 | clear_opt(sbi->s_mount_opt, RESERVATION); |
1078 | break; |
1079 | case Opt_journal_update: |
1080 | /* @@@ FIXME */ |
1081 | /* Eventually we will want to be able to create |
1082 | a journal file here. For now, only allow the |
1083 | user to specify an existing inode to be the |
1084 | journal file. */ |
1085 | if (is_remount) { |
1086 | ext3_msg(sb, KERN_ERR, "error: cannot specify " |
1087 | "journal on remount"); |
1088 | return 0; |
1089 | } |
1090 | set_opt (sbi->s_mount_opt, UPDATE_JOURNAL); |
1091 | break; |
1092 | case Opt_journal_inum: |
1093 | if (is_remount) { |
1094 | ext3_msg(sb, KERN_ERR, "error: cannot specify " |
1095 | "journal on remount"); |
1096 | return 0; |
1097 | } |
1098 | if (match_int(&args[0], &option)) |
1099 | return 0; |
1100 | *inum = option; |
1101 | break; |
1102 | case Opt_journal_dev: |
1103 | if (is_remount) { |
1104 | ext3_msg(sb, KERN_ERR, "error: cannot specify " |
1105 | "journal on remount"); |
1106 | return 0; |
1107 | } |
1108 | if (match_int(&args[0], &option)) |
1109 | return 0; |
1110 | *journal_devnum = option; |
1111 | break; |
1112 | case Opt_noload: |
1113 | set_opt (sbi->s_mount_opt, NOLOAD); |
1114 | break; |
1115 | case Opt_commit: |
1116 | if (match_int(&args[0], &option)) |
1117 | return 0; |
1118 | if (option < 0) |
1119 | return 0; |
1120 | if (option == 0) |
1121 | option = JBD_DEFAULT_MAX_COMMIT_AGE; |
1122 | sbi->s_commit_interval = HZ * option; |
1123 | break; |
1124 | case Opt_data_journal: |
1125 | data_opt = EXT3_MOUNT_JOURNAL_DATA; |
1126 | goto datacheck; |
1127 | case Opt_data_ordered: |
1128 | data_opt = EXT3_MOUNT_ORDERED_DATA; |
1129 | goto datacheck; |
1130 | case Opt_data_writeback: |
1131 | data_opt = EXT3_MOUNT_WRITEBACK_DATA; |
1132 | datacheck: |
1133 | if (is_remount) { |
1134 | if (test_opt(sb, DATA_FLAGS) == data_opt) |
1135 | break; |
1136 | ext3_msg(sb, KERN_ERR, |
1137 | "error: cannot change " |
1138 | "data mode on remount. The filesystem " |
1139 | "is mounted in data=%s mode and you " |
1140 | "try to remount it in data=%s mode.", |
1141 | data_mode_string(test_opt(sb, |
1142 | DATA_FLAGS)), |
1143 | data_mode_string(data_opt)); |
1144 | return 0; |
1145 | } else { |
1146 | clear_opt(sbi->s_mount_opt, DATA_FLAGS); |
1147 | sbi->s_mount_opt |= data_opt; |
1148 | } |
1149 | break; |
1150 | case Opt_data_err_abort: |
1151 | set_opt(sbi->s_mount_opt, DATA_ERR_ABORT); |
1152 | break; |
1153 | case Opt_data_err_ignore: |
1154 | clear_opt(sbi->s_mount_opt, DATA_ERR_ABORT); |
1155 | break; |
1156 | #ifdef CONFIG_QUOTA |
1157 | case Opt_usrjquota: |
1158 | if (!set_qf_name(sb, USRQUOTA, &args[0])) |
1159 | return 0; |
1160 | break; |
1161 | case Opt_grpjquota: |
1162 | if (!set_qf_name(sb, GRPQUOTA, &args[0])) |
1163 | return 0; |
1164 | break; |
1165 | case Opt_offusrjquota: |
1166 | if (!clear_qf_name(sb, USRQUOTA)) |
1167 | return 0; |
1168 | break; |
1169 | case Opt_offgrpjquota: |
1170 | if (!clear_qf_name(sb, GRPQUOTA)) |
1171 | return 0; |
1172 | break; |
1173 | case Opt_jqfmt_vfsold: |
1174 | qfmt = QFMT_VFS_OLD; |
1175 | goto set_qf_format; |
1176 | case Opt_jqfmt_vfsv0: |
1177 | qfmt = QFMT_VFS_V0; |
1178 | goto set_qf_format; |
1179 | case Opt_jqfmt_vfsv1: |
1180 | qfmt = QFMT_VFS_V1; |
1181 | set_qf_format: |
1182 | if (sb_any_quota_loaded(sb) && |
1183 | sbi->s_jquota_fmt != qfmt) { |
1184 | ext3_msg(sb, KERN_ERR, "error: cannot change " |
1185 | "journaled quota options when " |
1186 | "quota turned on."); |
1187 | return 0; |
1188 | } |
1189 | sbi->s_jquota_fmt = qfmt; |
1190 | break; |
1191 | case Opt_quota: |
1192 | case Opt_usrquota: |
1193 | set_opt(sbi->s_mount_opt, QUOTA); |
1194 | set_opt(sbi->s_mount_opt, USRQUOTA); |
1195 | break; |
1196 | case Opt_grpquota: |
1197 | set_opt(sbi->s_mount_opt, QUOTA); |
1198 | set_opt(sbi->s_mount_opt, GRPQUOTA); |
1199 | break; |
1200 | case Opt_noquota: |
1201 | if (sb_any_quota_loaded(sb)) { |
1202 | ext3_msg(sb, KERN_ERR, "error: cannot change " |
1203 | "quota options when quota turned on."); |
1204 | return 0; |
1205 | } |
1206 | clear_opt(sbi->s_mount_opt, QUOTA); |
1207 | clear_opt(sbi->s_mount_opt, USRQUOTA); |
1208 | clear_opt(sbi->s_mount_opt, GRPQUOTA); |
1209 | break; |
1210 | #else |
1211 | case Opt_quota: |
1212 | case Opt_usrquota: |
1213 | case Opt_grpquota: |
1214 | ext3_msg(sb, KERN_ERR, |
1215 | "error: quota options not supported."); |
1216 | break; |
1217 | case Opt_usrjquota: |
1218 | case Opt_grpjquota: |
1219 | case Opt_offusrjquota: |
1220 | case Opt_offgrpjquota: |
1221 | case Opt_jqfmt_vfsold: |
1222 | case Opt_jqfmt_vfsv0: |
1223 | case Opt_jqfmt_vfsv1: |
1224 | ext3_msg(sb, KERN_ERR, |
1225 | "error: journaled quota options not " |
1226 | "supported."); |
1227 | break; |
1228 | case Opt_noquota: |
1229 | break; |
1230 | #endif |
1231 | case Opt_abort: |
1232 | set_opt(sbi->s_mount_opt, ABORT); |
1233 | break; |
1234 | case Opt_nobarrier: |
1235 | clear_opt(sbi->s_mount_opt, BARRIER); |
1236 | break; |
1237 | case Opt_barrier: |
1238 | if (args[0].from) { |
1239 | if (match_int(&args[0], &option)) |
1240 | return 0; |
1241 | } else |
1242 | option = 1; /* No argument, default to 1 */ |
1243 | if (option) |
1244 | set_opt(sbi->s_mount_opt, BARRIER); |
1245 | else |
1246 | clear_opt(sbi->s_mount_opt, BARRIER); |
1247 | break; |
1248 | case Opt_ignore: |
1249 | break; |
1250 | case Opt_resize: |
1251 | if (!is_remount) { |
1252 | ext3_msg(sb, KERN_ERR, |
1253 | "error: resize option only available " |
1254 | "for remount"); |
1255 | return 0; |
1256 | } |
1257 | if (match_int(&args[0], &option) != 0) |
1258 | return 0; |
1259 | *n_blocks_count = option; |
1260 | break; |
1261 | case Opt_nobh: |
1262 | ext3_msg(sb, KERN_WARNING, |
1263 | "warning: ignoring deprecated nobh option"); |
1264 | break; |
1265 | case Opt_bh: |
1266 | ext3_msg(sb, KERN_WARNING, |
1267 | "warning: ignoring deprecated bh option"); |
1268 | break; |
1269 | default: |
1270 | ext3_msg(sb, KERN_ERR, |
1271 | "error: unrecognized mount option \"%s\" " |
1272 | "or missing value", p); |
1273 | return 0; |
1274 | } |
1275 | } |
1276 | #ifdef CONFIG_QUOTA |
1277 | if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) { |
1278 | if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA]) |
1279 | clear_opt(sbi->s_mount_opt, USRQUOTA); |
1280 | if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA]) |
1281 | clear_opt(sbi->s_mount_opt, GRPQUOTA); |
1282 | |
1283 | if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) { |
1284 | ext3_msg(sb, KERN_ERR, "error: old and new quota " |
1285 | "format mixing."); |
1286 | return 0; |
1287 | } |
1288 | |
1289 | if (!sbi->s_jquota_fmt) { |
1290 | ext3_msg(sb, KERN_ERR, "error: journaled quota format " |
1291 | "not specified."); |
1292 | return 0; |
1293 | } |
1294 | } else { |
1295 | if (sbi->s_jquota_fmt) { |
1296 | ext3_msg(sb, KERN_ERR, "error: journaled quota format " |
1297 | "specified with no journaling " |
1298 | "enabled."); |
1299 | return 0; |
1300 | } |
1301 | } |
1302 | #endif |
1303 | return 1; |
1304 | } |
1305 | |
1306 | static int ext3_setup_super(struct super_block *sb, struct ext3_super_block *es, |
1307 | int read_only) |
1308 | { |
1309 | struct ext3_sb_info *sbi = EXT3_SB(sb); |
1310 | int res = 0; |
1311 | |
1312 | if (le32_to_cpu(es->s_rev_level) > EXT3_MAX_SUPP_REV) { |
1313 | ext3_msg(sb, KERN_ERR, |
1314 | "error: revision level too high, " |
1315 | "forcing read-only mode"); |
1316 | res = MS_RDONLY; |
1317 | } |
1318 | if (read_only) |
1319 | return res; |
1320 | if (!(sbi->s_mount_state & EXT3_VALID_FS)) |
1321 | ext3_msg(sb, KERN_WARNING, |
1322 | "warning: mounting unchecked fs, " |
1323 | "running e2fsck is recommended"); |
1324 | else if ((sbi->s_mount_state & EXT3_ERROR_FS)) |
1325 | ext3_msg(sb, KERN_WARNING, |
1326 | "warning: mounting fs with errors, " |
1327 | "running e2fsck is recommended"); |
1328 | else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 && |
1329 | le16_to_cpu(es->s_mnt_count) >= |
1330 | le16_to_cpu(es->s_max_mnt_count)) |
1331 | ext3_msg(sb, KERN_WARNING, |
1332 | "warning: maximal mount count reached, " |
1333 | "running e2fsck is recommended"); |
1334 | else if (le32_to_cpu(es->s_checkinterval) && |
1335 | (le32_to_cpu(es->s_lastcheck) + |
1336 | le32_to_cpu(es->s_checkinterval) <= get_seconds())) |
1337 | ext3_msg(sb, KERN_WARNING, |
1338 | "warning: checktime reached, " |
1339 | "running e2fsck is recommended"); |
1340 | #if 0 |
1341 | /* @@@ We _will_ want to clear the valid bit if we find |
1342 | inconsistencies, to force a fsck at reboot. But for |
1343 | a plain journaled filesystem we can keep it set as |
1344 | valid forever! :) */ |
1345 | es->s_state &= cpu_to_le16(~EXT3_VALID_FS); |
1346 | #endif |
1347 | if (!le16_to_cpu(es->s_max_mnt_count)) |
1348 | es->s_max_mnt_count = cpu_to_le16(EXT3_DFL_MAX_MNT_COUNT); |
1349 | le16_add_cpu(&es->s_mnt_count, 1); |
1350 | es->s_mtime = cpu_to_le32(get_seconds()); |
1351 | ext3_update_dynamic_rev(sb); |
1352 | EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER); |
1353 | |
1354 | ext3_commit_super(sb, es, 1); |
1355 | if (test_opt(sb, DEBUG)) |
1356 | ext3_msg(sb, KERN_INFO, "[bs=%lu, gc=%lu, " |
1357 | "bpg=%lu, ipg=%lu, mo=%04lx]", |
1358 | sb->s_blocksize, |
1359 | sbi->s_groups_count, |
1360 | EXT3_BLOCKS_PER_GROUP(sb), |
1361 | EXT3_INODES_PER_GROUP(sb), |
1362 | sbi->s_mount_opt); |
1363 | |
1364 | if (EXT3_SB(sb)->s_journal->j_inode == NULL) { |
1365 | char b[BDEVNAME_SIZE]; |
1366 | ext3_msg(sb, KERN_INFO, "using external journal on %s", |
1367 | bdevname(EXT3_SB(sb)->s_journal->j_dev, b)); |
1368 | } else { |
1369 | ext3_msg(sb, KERN_INFO, "using internal journal"); |
1370 | } |
1371 | cleancache_init_fs(sb); |
1372 | return res; |
1373 | } |
1374 | |
1375 | /* Called at mount-time, super-block is locked */ |
1376 | static int ext3_check_descriptors(struct super_block *sb) |
1377 | { |
1378 | struct ext3_sb_info *sbi = EXT3_SB(sb); |
1379 | int i; |
1380 | |
1381 | ext3_debug ("Checking group descriptors"); |
1382 | |
1383 | for (i = 0; i < sbi->s_groups_count; i++) { |
1384 | struct ext3_group_desc *gdp = ext3_get_group_desc(sb, i, NULL); |
1385 | ext3_fsblk_t first_block = ext3_group_first_block_no(sb, i); |
1386 | ext3_fsblk_t last_block; |
1387 | |
1388 | if (i == sbi->s_groups_count - 1) |
1389 | last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1; |
1390 | else |
1391 | last_block = first_block + |
1392 | (EXT3_BLOCKS_PER_GROUP(sb) - 1); |
1393 | |
1394 | if (le32_to_cpu(gdp->bg_block_bitmap) < first_block || |
1395 | le32_to_cpu(gdp->bg_block_bitmap) > last_block) |
1396 | { |
1397 | ext3_error (sb, "ext3_check_descriptors", |
1398 | "Block bitmap for group %d" |
1399 | " not in group (block %lu)!", |
1400 | i, (unsigned long) |
1401 | le32_to_cpu(gdp->bg_block_bitmap)); |
1402 | return 0; |
1403 | } |
1404 | if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block || |
1405 | le32_to_cpu(gdp->bg_inode_bitmap) > last_block) |
1406 | { |
1407 | ext3_error (sb, "ext3_check_descriptors", |
1408 | "Inode bitmap for group %d" |
1409 | " not in group (block %lu)!", |
1410 | i, (unsigned long) |
1411 | le32_to_cpu(gdp->bg_inode_bitmap)); |
1412 | return 0; |
1413 | } |
1414 | if (le32_to_cpu(gdp->bg_inode_table) < first_block || |
1415 | le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 > |
1416 | last_block) |
1417 | { |
1418 | ext3_error (sb, "ext3_check_descriptors", |
1419 | "Inode table for group %d" |
1420 | " not in group (block %lu)!", |
1421 | i, (unsigned long) |
1422 | le32_to_cpu(gdp->bg_inode_table)); |
1423 | return 0; |
1424 | } |
1425 | } |
1426 | |
1427 | sbi->s_es->s_free_blocks_count=cpu_to_le32(ext3_count_free_blocks(sb)); |
1428 | sbi->s_es->s_free_inodes_count=cpu_to_le32(ext3_count_free_inodes(sb)); |
1429 | return 1; |
1430 | } |
1431 | |
1432 | |
1433 | /* ext3_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 | * ext3_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 ext3_orphan_cleanup (struct super_block * sb, |
1451 | struct ext3_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 | ext3_msg(sb, KERN_ERR, "error: write access " |
1465 | "unavailable, skipping orphan cleanup."); |
1466 | return; |
1467 | } |
1468 | |
1469 | /* Check if feature set allows readwrite operations */ |
1470 | if (EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP)) { |
1471 | ext3_msg(sb, KERN_INFO, "Skipping orphan cleanup due to " |
1472 | "unknown ROCOMPAT features"); |
1473 | return; |
1474 | } |
1475 | |
1476 | if (EXT3_SB(sb)->s_mount_state & EXT3_ERROR_FS) { |
1477 | if (es->s_last_orphan) |
1478 | jbd_debug(1, "Errors on filesystem, " |
1479 | "clearing orphan list.\n"); |
1480 | es->s_last_orphan = 0; |
1481 | jbd_debug(1, "Skipping orphan recovery on fs with errors.\n"); |
1482 | return; |
1483 | } |
1484 | |
1485 | if (s_flags & MS_RDONLY) { |
1486 | ext3_msg(sb, KERN_INFO, "orphan cleanup on readonly fs"); |
1487 | sb->s_flags &= ~MS_RDONLY; |
1488 | } |
1489 | #ifdef CONFIG_QUOTA |
1490 | /* Needed for iput() to work correctly and not trash data */ |
1491 | sb->s_flags |= MS_ACTIVE; |
1492 | /* Turn on quotas so that they are updated correctly */ |
1493 | for (i = 0; i < MAXQUOTAS; i++) { |
1494 | if (EXT3_SB(sb)->s_qf_names[i]) { |
1495 | int ret = ext3_quota_on_mount(sb, i); |
1496 | if (ret < 0) |
1497 | ext3_msg(sb, KERN_ERR, |
1498 | "error: cannot turn on journaled " |
1499 | "quota: %d", ret); |
1500 | } |
1501 | } |
1502 | #endif |
1503 | |
1504 | while (es->s_last_orphan) { |
1505 | struct inode *inode; |
1506 | |
1507 | inode = ext3_orphan_get(sb, le32_to_cpu(es->s_last_orphan)); |
1508 | if (IS_ERR(inode)) { |
1509 | es->s_last_orphan = 0; |
1510 | break; |
1511 | } |
1512 | |
1513 | list_add(&EXT3_I(inode)->i_orphan, &EXT3_SB(sb)->s_orphan); |
1514 | dquot_initialize(inode); |
1515 | if (inode->i_nlink) { |
1516 | printk(KERN_DEBUG |
1517 | "%s: truncating inode %lu to %Ld bytes\n", |
1518 | __func__, inode->i_ino, inode->i_size); |
1519 | jbd_debug(2, "truncating inode %lu to %Ld bytes\n", |
1520 | inode->i_ino, inode->i_size); |
1521 | ext3_truncate(inode); |
1522 | nr_truncates++; |
1523 | } else { |
1524 | printk(KERN_DEBUG |
1525 | "%s: deleting unreferenced inode %lu\n", |
1526 | __func__, inode->i_ino); |
1527 | jbd_debug(2, "deleting unreferenced inode %lu\n", |
1528 | inode->i_ino); |
1529 | nr_orphans++; |
1530 | } |
1531 | iput(inode); /* The delete magic happens here! */ |
1532 | } |
1533 | |
1534 | #define PLURAL(x) (x), ((x)==1) ? "" : "s" |
1535 | |
1536 | if (nr_orphans) |
1537 | ext3_msg(sb, KERN_INFO, "%d orphan inode%s deleted", |
1538 | PLURAL(nr_orphans)); |
1539 | if (nr_truncates) |
1540 | ext3_msg(sb, KERN_INFO, "%d truncate%s cleaned up", |
1541 | PLURAL(nr_truncates)); |
1542 | #ifdef CONFIG_QUOTA |
1543 | /* Turn quotas off */ |
1544 | for (i = 0; i < MAXQUOTAS; i++) { |
1545 | if (sb_dqopt(sb)->files[i]) |
1546 | dquot_quota_off(sb, i); |
1547 | } |
1548 | #endif |
1549 | sb->s_flags = s_flags; /* Restore MS_RDONLY status */ |
1550 | } |
1551 | |
1552 | /* |
1553 | * Maximal file size. There is a direct, and {,double-,triple-}indirect |
1554 | * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks. |
1555 | * We need to be 1 filesystem block less than the 2^32 sector limit. |
1556 | */ |
1557 | static loff_t ext3_max_size(int bits) |
1558 | { |
1559 | loff_t res = EXT3_NDIR_BLOCKS; |
1560 | int meta_blocks; |
1561 | loff_t upper_limit; |
1562 | |
1563 | /* This is calculated to be the largest file size for a |
1564 | * dense, file such that the total number of |
1565 | * sectors in the file, including data and all indirect blocks, |
1566 | * does not exceed 2^32 -1 |
1567 | * __u32 i_blocks representing the total number of |
1568 | * 512 bytes blocks of the file |
1569 | */ |
1570 | upper_limit = (1LL << 32) - 1; |
1571 | |
1572 | /* total blocks in file system block size */ |
1573 | upper_limit >>= (bits - 9); |
1574 | |
1575 | |
1576 | /* indirect blocks */ |
1577 | meta_blocks = 1; |
1578 | /* double indirect blocks */ |
1579 | meta_blocks += 1 + (1LL << (bits-2)); |
1580 | /* tripple indirect blocks */ |
1581 | meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2))); |
1582 | |
1583 | upper_limit -= meta_blocks; |
1584 | upper_limit <<= bits; |
1585 | |
1586 | res += 1LL << (bits-2); |
1587 | res += 1LL << (2*(bits-2)); |
1588 | res += 1LL << (3*(bits-2)); |
1589 | res <<= bits; |
1590 | if (res > upper_limit) |
1591 | res = upper_limit; |
1592 | |
1593 | if (res > MAX_LFS_FILESIZE) |
1594 | res = MAX_LFS_FILESIZE; |
1595 | |
1596 | return res; |
1597 | } |
1598 | |
1599 | static ext3_fsblk_t descriptor_loc(struct super_block *sb, |
1600 | ext3_fsblk_t logic_sb_block, |
1601 | int nr) |
1602 | { |
1603 | struct ext3_sb_info *sbi = EXT3_SB(sb); |
1604 | unsigned long bg, first_meta_bg; |
1605 | int has_super = 0; |
1606 | |
1607 | first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg); |
1608 | |
1609 | if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_META_BG) || |
1610 | nr < first_meta_bg) |
1611 | return (logic_sb_block + nr + 1); |
1612 | bg = sbi->s_desc_per_block * nr; |
1613 | if (ext3_bg_has_super(sb, bg)) |
1614 | has_super = 1; |
1615 | return (has_super + ext3_group_first_block_no(sb, bg)); |
1616 | } |
1617 | |
1618 | |
1619 | static int ext3_fill_super (struct super_block *sb, void *data, int silent) |
1620 | { |
1621 | struct buffer_head * bh; |
1622 | struct ext3_super_block *es = NULL; |
1623 | struct ext3_sb_info *sbi; |
1624 | ext3_fsblk_t block; |
1625 | ext3_fsblk_t sb_block = get_sb_block(&data, sb); |
1626 | ext3_fsblk_t logic_sb_block; |
1627 | unsigned long offset = 0; |
1628 | unsigned int journal_inum = 0; |
1629 | unsigned long journal_devnum = 0; |
1630 | unsigned long def_mount_opts; |
1631 | struct inode *root; |
1632 | int blocksize; |
1633 | int hblock; |
1634 | int db_count; |
1635 | int i; |
1636 | int needs_recovery; |
1637 | int ret = -EINVAL; |
1638 | __le32 features; |
1639 | int err; |
1640 | |
1641 | sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); |
1642 | if (!sbi) |
1643 | return -ENOMEM; |
1644 | |
1645 | sbi->s_blockgroup_lock = |
1646 | kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL); |
1647 | if (!sbi->s_blockgroup_lock) { |
1648 | kfree(sbi); |
1649 | return -ENOMEM; |
1650 | } |
1651 | sb->s_fs_info = sbi; |
1652 | sbi->s_mount_opt = 0; |
1653 | sbi->s_resuid = EXT3_DEF_RESUID; |
1654 | sbi->s_resgid = EXT3_DEF_RESGID; |
1655 | sbi->s_sb_block = sb_block; |
1656 | |
1657 | blocksize = sb_min_blocksize(sb, EXT3_MIN_BLOCK_SIZE); |
1658 | if (!blocksize) { |
1659 | ext3_msg(sb, KERN_ERR, "error: unable to set blocksize"); |
1660 | goto out_fail; |
1661 | } |
1662 | |
1663 | /* |
1664 | * The ext3 superblock will not be buffer aligned for other than 1kB |
1665 | * block sizes. We need to calculate the offset from buffer start. |
1666 | */ |
1667 | if (blocksize != EXT3_MIN_BLOCK_SIZE) { |
1668 | logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize; |
1669 | offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize; |
1670 | } else { |
1671 | logic_sb_block = sb_block; |
1672 | } |
1673 | |
1674 | if (!(bh = sb_bread(sb, logic_sb_block))) { |
1675 | ext3_msg(sb, KERN_ERR, "error: unable to read superblock"); |
1676 | goto out_fail; |
1677 | } |
1678 | /* |
1679 | * Note: s_es must be initialized as soon as possible because |
1680 | * some ext3 macro-instructions depend on its value |
1681 | */ |
1682 | es = (struct ext3_super_block *) (bh->b_data + offset); |
1683 | sbi->s_es = es; |
1684 | sb->s_magic = le16_to_cpu(es->s_magic); |
1685 | if (sb->s_magic != EXT3_SUPER_MAGIC) |
1686 | goto cantfind_ext3; |
1687 | |
1688 | /* Set defaults before we parse the mount options */ |
1689 | def_mount_opts = le32_to_cpu(es->s_default_mount_opts); |
1690 | if (def_mount_opts & EXT3_DEFM_DEBUG) |
1691 | set_opt(sbi->s_mount_opt, DEBUG); |
1692 | if (def_mount_opts & EXT3_DEFM_BSDGROUPS) |
1693 | set_opt(sbi->s_mount_opt, GRPID); |
1694 | if (def_mount_opts & EXT3_DEFM_UID16) |
1695 | set_opt(sbi->s_mount_opt, NO_UID32); |
1696 | #ifdef CONFIG_EXT3_FS_XATTR |
1697 | if (def_mount_opts & EXT3_DEFM_XATTR_USER) |
1698 | set_opt(sbi->s_mount_opt, XATTR_USER); |
1699 | #endif |
1700 | #ifdef CONFIG_EXT3_FS_POSIX_ACL |
1701 | if (def_mount_opts & EXT3_DEFM_ACL) |
1702 | set_opt(sbi->s_mount_opt, POSIX_ACL); |
1703 | #endif |
1704 | if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_DATA) |
1705 | set_opt(sbi->s_mount_opt, JOURNAL_DATA); |
1706 | else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_ORDERED) |
1707 | set_opt(sbi->s_mount_opt, ORDERED_DATA); |
1708 | else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_WBACK) |
1709 | set_opt(sbi->s_mount_opt, WRITEBACK_DATA); |
1710 | |
1711 | if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_PANIC) |
1712 | set_opt(sbi->s_mount_opt, ERRORS_PANIC); |
1713 | else if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_CONTINUE) |
1714 | set_opt(sbi->s_mount_opt, ERRORS_CONT); |
1715 | else |
1716 | set_opt(sbi->s_mount_opt, ERRORS_RO); |
1717 | |
1718 | sbi->s_resuid = le16_to_cpu(es->s_def_resuid); |
1719 | sbi->s_resgid = le16_to_cpu(es->s_def_resgid); |
1720 | |
1721 | set_opt(sbi->s_mount_opt, RESERVATION); |
1722 | |
1723 | if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum, |
1724 | NULL, 0)) |
1725 | goto failed_mount; |
1726 | |
1727 | sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | |
1728 | (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0); |
1729 | |
1730 | if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV && |
1731 | (EXT3_HAS_COMPAT_FEATURE(sb, ~0U) || |
1732 | EXT3_HAS_RO_COMPAT_FEATURE(sb, ~0U) || |
1733 | EXT3_HAS_INCOMPAT_FEATURE(sb, ~0U))) |
1734 | ext3_msg(sb, KERN_WARNING, |
1735 | "warning: feature flags set on rev 0 fs, " |
1736 | "running e2fsck is recommended"); |
1737 | /* |
1738 | * Check feature flags regardless of the revision level, since we |
1739 | * previously didn't change the revision level when setting the flags, |
1740 | * so there is a chance incompat flags are set on a rev 0 filesystem. |
1741 | */ |
1742 | features = EXT3_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP); |
1743 | if (features) { |
1744 | ext3_msg(sb, KERN_ERR, |
1745 | "error: couldn't mount because of unsupported " |
1746 | "optional features (%x)", le32_to_cpu(features)); |
1747 | goto failed_mount; |
1748 | } |
1749 | features = EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP); |
1750 | if (!(sb->s_flags & MS_RDONLY) && features) { |
1751 | ext3_msg(sb, KERN_ERR, |
1752 | "error: couldn't mount RDWR because of unsupported " |
1753 | "optional features (%x)", le32_to_cpu(features)); |
1754 | goto failed_mount; |
1755 | } |
1756 | blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size); |
1757 | |
1758 | if (blocksize < EXT3_MIN_BLOCK_SIZE || |
1759 | blocksize > EXT3_MAX_BLOCK_SIZE) { |
1760 | ext3_msg(sb, KERN_ERR, |
1761 | "error: couldn't mount because of unsupported " |
1762 | "filesystem blocksize %d", blocksize); |
1763 | goto failed_mount; |
1764 | } |
1765 | |
1766 | hblock = bdev_logical_block_size(sb->s_bdev); |
1767 | if (sb->s_blocksize != blocksize) { |
1768 | /* |
1769 | * Make sure the blocksize for the filesystem is larger |
1770 | * than the hardware sectorsize for the machine. |
1771 | */ |
1772 | if (blocksize < hblock) { |
1773 | ext3_msg(sb, KERN_ERR, |
1774 | "error: fsblocksize %d too small for " |
1775 | "hardware sectorsize %d", blocksize, hblock); |
1776 | goto failed_mount; |
1777 | } |
1778 | |
1779 | brelse (bh); |
1780 | if (!sb_set_blocksize(sb, blocksize)) { |
1781 | ext3_msg(sb, KERN_ERR, |
1782 | "error: bad blocksize %d", blocksize); |
1783 | goto out_fail; |
1784 | } |
1785 | logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize; |
1786 | offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize; |
1787 | bh = sb_bread(sb, logic_sb_block); |
1788 | if (!bh) { |
1789 | ext3_msg(sb, KERN_ERR, |
1790 | "error: can't read superblock on 2nd try"); |
1791 | goto failed_mount; |
1792 | } |
1793 | es = (struct ext3_super_block *)(bh->b_data + offset); |
1794 | sbi->s_es = es; |
1795 | if (es->s_magic != cpu_to_le16(EXT3_SUPER_MAGIC)) { |
1796 | ext3_msg(sb, KERN_ERR, |
1797 | "error: magic mismatch"); |
1798 | goto failed_mount; |
1799 | } |
1800 | } |
1801 | |
1802 | sb->s_maxbytes = ext3_max_size(sb->s_blocksize_bits); |
1803 | |
1804 | if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV) { |
1805 | sbi->s_inode_size = EXT3_GOOD_OLD_INODE_SIZE; |
1806 | sbi->s_first_ino = EXT3_GOOD_OLD_FIRST_INO; |
1807 | } else { |
1808 | sbi->s_inode_size = le16_to_cpu(es->s_inode_size); |
1809 | sbi->s_first_ino = le32_to_cpu(es->s_first_ino); |
1810 | if ((sbi->s_inode_size < EXT3_GOOD_OLD_INODE_SIZE) || |
1811 | (!is_power_of_2(sbi->s_inode_size)) || |
1812 | (sbi->s_inode_size > blocksize)) { |
1813 | ext3_msg(sb, KERN_ERR, |
1814 | "error: unsupported inode size: %d", |
1815 | sbi->s_inode_size); |
1816 | goto failed_mount; |
1817 | } |
1818 | } |
1819 | sbi->s_frag_size = EXT3_MIN_FRAG_SIZE << |
1820 | le32_to_cpu(es->s_log_frag_size); |
1821 | if (blocksize != sbi->s_frag_size) { |
1822 | ext3_msg(sb, KERN_ERR, |
1823 | "error: fragsize %lu != blocksize %u (unsupported)", |
1824 | sbi->s_frag_size, blocksize); |
1825 | goto failed_mount; |
1826 | } |
1827 | sbi->s_frags_per_block = 1; |
1828 | sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group); |
1829 | sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group); |
1830 | sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group); |
1831 | if (EXT3_INODE_SIZE(sb) == 0 || EXT3_INODES_PER_GROUP(sb) == 0) |
1832 | goto cantfind_ext3; |
1833 | sbi->s_inodes_per_block = blocksize / EXT3_INODE_SIZE(sb); |
1834 | if (sbi->s_inodes_per_block == 0) |
1835 | goto cantfind_ext3; |
1836 | sbi->s_itb_per_group = sbi->s_inodes_per_group / |
1837 | sbi->s_inodes_per_block; |
1838 | sbi->s_desc_per_block = blocksize / sizeof(struct ext3_group_desc); |
1839 | sbi->s_sbh = bh; |
1840 | sbi->s_mount_state = le16_to_cpu(es->s_state); |
1841 | sbi->s_addr_per_block_bits = ilog2(EXT3_ADDR_PER_BLOCK(sb)); |
1842 | sbi->s_desc_per_block_bits = ilog2(EXT3_DESC_PER_BLOCK(sb)); |
1843 | for (i=0; i < 4; i++) |
1844 | sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]); |
1845 | sbi->s_def_hash_version = es->s_def_hash_version; |
1846 | i = le32_to_cpu(es->s_flags); |
1847 | if (i & EXT2_FLAGS_UNSIGNED_HASH) |
1848 | sbi->s_hash_unsigned = 3; |
1849 | else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) { |
1850 | #ifdef __CHAR_UNSIGNED__ |
1851 | es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH); |
1852 | sbi->s_hash_unsigned = 3; |
1853 | #else |
1854 | es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH); |
1855 | #endif |
1856 | } |
1857 | |
1858 | if (sbi->s_blocks_per_group > blocksize * 8) { |
1859 | ext3_msg(sb, KERN_ERR, |
1860 | "#blocks per group too big: %lu", |
1861 | sbi->s_blocks_per_group); |
1862 | goto failed_mount; |
1863 | } |
1864 | if (sbi->s_frags_per_group > blocksize * 8) { |
1865 | ext3_msg(sb, KERN_ERR, |
1866 | "error: #fragments per group too big: %lu", |
1867 | sbi->s_frags_per_group); |
1868 | goto failed_mount; |
1869 | } |
1870 | if (sbi->s_inodes_per_group > blocksize * 8) { |
1871 | ext3_msg(sb, KERN_ERR, |
1872 | "error: #inodes per group too big: %lu", |
1873 | sbi->s_inodes_per_group); |
1874 | goto failed_mount; |
1875 | } |
1876 | |
1877 | err = generic_check_addressable(sb->s_blocksize_bits, |
1878 | le32_to_cpu(es->s_blocks_count)); |
1879 | if (err) { |
1880 | ext3_msg(sb, KERN_ERR, |
1881 | "error: filesystem is too large to mount safely"); |
1882 | if (sizeof(sector_t) < 8) |
1883 | ext3_msg(sb, KERN_ERR, |
1884 | "error: CONFIG_LBDAF not enabled"); |
1885 | ret = err; |
1886 | goto failed_mount; |
1887 | } |
1888 | |
1889 | if (EXT3_BLOCKS_PER_GROUP(sb) == 0) |
1890 | goto cantfind_ext3; |
1891 | sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) - |
1892 | le32_to_cpu(es->s_first_data_block) - 1) |
1893 | / EXT3_BLOCKS_PER_GROUP(sb)) + 1; |
1894 | db_count = DIV_ROUND_UP(sbi->s_groups_count, EXT3_DESC_PER_BLOCK(sb)); |
1895 | sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *), |
1896 | GFP_KERNEL); |
1897 | if (sbi->s_group_desc == NULL) { |
1898 | ext3_msg(sb, KERN_ERR, |
1899 | "error: not enough memory"); |
1900 | ret = -ENOMEM; |
1901 | goto failed_mount; |
1902 | } |
1903 | |
1904 | bgl_lock_init(sbi->s_blockgroup_lock); |
1905 | |
1906 | for (i = 0; i < db_count; i++) { |
1907 | block = descriptor_loc(sb, logic_sb_block, i); |
1908 | sbi->s_group_desc[i] = sb_bread(sb, block); |
1909 | if (!sbi->s_group_desc[i]) { |
1910 | ext3_msg(sb, KERN_ERR, |
1911 | "error: can't read group descriptor %d", i); |
1912 | db_count = i; |
1913 | goto failed_mount2; |
1914 | } |
1915 | } |
1916 | if (!ext3_check_descriptors (sb)) { |
1917 | ext3_msg(sb, KERN_ERR, |
1918 | "error: group descriptors corrupted"); |
1919 | goto failed_mount2; |
1920 | } |
1921 | sbi->s_gdb_count = db_count; |
1922 | get_random_bytes(&sbi->s_next_generation, sizeof(u32)); |
1923 | spin_lock_init(&sbi->s_next_gen_lock); |
1924 | |
1925 | /* per fileystem reservation list head & lock */ |
1926 | spin_lock_init(&sbi->s_rsv_window_lock); |
1927 | sbi->s_rsv_window_root = RB_ROOT; |
1928 | /* Add a single, static dummy reservation to the start of the |
1929 | * reservation window list --- it gives us a placeholder for |
1930 | * append-at-start-of-list which makes the allocation logic |
1931 | * _much_ simpler. */ |
1932 | sbi->s_rsv_window_head.rsv_start = EXT3_RESERVE_WINDOW_NOT_ALLOCATED; |
1933 | sbi->s_rsv_window_head.rsv_end = EXT3_RESERVE_WINDOW_NOT_ALLOCATED; |
1934 | sbi->s_rsv_window_head.rsv_alloc_hit = 0; |
1935 | sbi->s_rsv_window_head.rsv_goal_size = 0; |
1936 | ext3_rsv_window_add(sb, &sbi->s_rsv_window_head); |
1937 | |
1938 | /* |
1939 | * set up enough so that it can read an inode |
1940 | */ |
1941 | sb->s_op = &ext3_sops; |
1942 | sb->s_export_op = &ext3_export_ops; |
1943 | sb->s_xattr = ext3_xattr_handlers; |
1944 | #ifdef CONFIG_QUOTA |
1945 | sb->s_qcop = &ext3_qctl_operations; |
1946 | sb->dq_op = &ext3_quota_operations; |
1947 | #endif |
1948 | memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid)); |
1949 | INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */ |
1950 | mutex_init(&sbi->s_orphan_lock); |
1951 | mutex_init(&sbi->s_resize_lock); |
1952 | |
1953 | sb->s_root = NULL; |
1954 | |
1955 | needs_recovery = (es->s_last_orphan != 0 || |
1956 | EXT3_HAS_INCOMPAT_FEATURE(sb, |
1957 | EXT3_FEATURE_INCOMPAT_RECOVER)); |
1958 | |
1959 | /* |
1960 | * The first inode we look at is the journal inode. Don't try |
1961 | * root first: it may be modified in the journal! |
1962 | */ |
1963 | if (!test_opt(sb, NOLOAD) && |
1964 | EXT3_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) { |
1965 | if (ext3_load_journal(sb, es, journal_devnum)) |
1966 | goto failed_mount2; |
1967 | } else if (journal_inum) { |
1968 | if (ext3_create_journal(sb, es, journal_inum)) |
1969 | goto failed_mount2; |
1970 | } else { |
1971 | if (!silent) |
1972 | ext3_msg(sb, KERN_ERR, |
1973 | "error: no journal found. " |
1974 | "mounting ext3 over ext2?"); |
1975 | goto failed_mount2; |
1976 | } |
1977 | err = percpu_counter_init(&sbi->s_freeblocks_counter, |
1978 | ext3_count_free_blocks(sb)); |
1979 | if (!err) { |
1980 | err = percpu_counter_init(&sbi->s_freeinodes_counter, |
1981 | ext3_count_free_inodes(sb)); |
1982 | } |
1983 | if (!err) { |
1984 | err = percpu_counter_init(&sbi->s_dirs_counter, |
1985 | ext3_count_dirs(sb)); |
1986 | } |
1987 | if (err) { |
1988 | ext3_msg(sb, KERN_ERR, "error: insufficient memory"); |
1989 | ret = err; |
1990 | goto failed_mount3; |
1991 | } |
1992 | |
1993 | /* We have now updated the journal if required, so we can |
1994 | * validate the data journaling mode. */ |
1995 | switch (test_opt(sb, DATA_FLAGS)) { |
1996 | case 0: |
1997 | /* No mode set, assume a default based on the journal |
1998 | capabilities: ORDERED_DATA if the journal can |
1999 | cope, else JOURNAL_DATA */ |
2000 | if (journal_check_available_features |
2001 | (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE)) |
2002 | set_opt(sbi->s_mount_opt, DEFAULT_DATA_MODE); |
2003 | else |
2004 | set_opt(sbi->s_mount_opt, JOURNAL_DATA); |
2005 | break; |
2006 | |
2007 | case EXT3_MOUNT_ORDERED_DATA: |
2008 | case EXT3_MOUNT_WRITEBACK_DATA: |
2009 | if (!journal_check_available_features |
2010 | (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE)) { |
2011 | ext3_msg(sb, KERN_ERR, |
2012 | "error: journal does not support " |
2013 | "requested data journaling mode"); |
2014 | goto failed_mount3; |
2015 | } |
2016 | default: |
2017 | break; |
2018 | } |
2019 | |
2020 | /* |
2021 | * The journal_load will have done any necessary log recovery, |
2022 | * so we can safely mount the rest of the filesystem now. |
2023 | */ |
2024 | |
2025 | root = ext3_iget(sb, EXT3_ROOT_INO); |
2026 | if (IS_ERR(root)) { |
2027 | ext3_msg(sb, KERN_ERR, "error: get root inode failed"); |
2028 | ret = PTR_ERR(root); |
2029 | goto failed_mount3; |
2030 | } |
2031 | if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { |
2032 | iput(root); |
2033 | ext3_msg(sb, KERN_ERR, "error: corrupt root inode, run e2fsck"); |
2034 | goto failed_mount3; |
2035 | } |
2036 | sb->s_root = d_alloc_root(root); |
2037 | if (!sb->s_root) { |
2038 | ext3_msg(sb, KERN_ERR, "error: get root dentry failed"); |
2039 | iput(root); |
2040 | ret = -ENOMEM; |
2041 | goto failed_mount3; |
2042 | } |
2043 | |
2044 | ext3_setup_super (sb, es, sb->s_flags & MS_RDONLY); |
2045 | |
2046 | EXT3_SB(sb)->s_mount_state |= EXT3_ORPHAN_FS; |
2047 | ext3_orphan_cleanup(sb, es); |
2048 | EXT3_SB(sb)->s_mount_state &= ~EXT3_ORPHAN_FS; |
2049 | if (needs_recovery) |
2050 | ext3_msg(sb, KERN_INFO, "recovery complete"); |
2051 | ext3_mark_recovery_complete(sb, es); |
2052 | ext3_msg(sb, KERN_INFO, "mounted filesystem with %s data mode", |
2053 | test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA ? "journal": |
2054 | test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA ? "ordered": |
2055 | "writeback"); |
2056 | |
2057 | return 0; |
2058 | |
2059 | cantfind_ext3: |
2060 | if (!silent) |
2061 | ext3_msg(sb, KERN_INFO, |
2062 | "error: can't find ext3 filesystem on dev %s.", |
2063 | sb->s_id); |
2064 | goto failed_mount; |
2065 | |
2066 | failed_mount3: |
2067 | percpu_counter_destroy(&sbi->s_freeblocks_counter); |
2068 | percpu_counter_destroy(&sbi->s_freeinodes_counter); |
2069 | percpu_counter_destroy(&sbi->s_dirs_counter); |
2070 | journal_destroy(sbi->s_journal); |
2071 | failed_mount2: |
2072 | for (i = 0; i < db_count; i++) |
2073 | brelse(sbi->s_group_desc[i]); |
2074 | kfree(sbi->s_group_desc); |
2075 | failed_mount: |
2076 | #ifdef CONFIG_QUOTA |
2077 | for (i = 0; i < MAXQUOTAS; i++) |
2078 | kfree(sbi->s_qf_names[i]); |
2079 | #endif |
2080 | ext3_blkdev_remove(sbi); |
2081 | brelse(bh); |
2082 | out_fail: |
2083 | sb->s_fs_info = NULL; |
2084 | kfree(sbi->s_blockgroup_lock); |
2085 | kfree(sbi); |
2086 | return ret; |
2087 | } |
2088 | |
2089 | /* |
2090 | * Setup any per-fs journal parameters now. We'll do this both on |
2091 | * initial mount, once the journal has been initialised but before we've |
2092 | * done any recovery; and again on any subsequent remount. |
2093 | */ |
2094 | static void ext3_init_journal_params(struct super_block *sb, journal_t *journal) |
2095 | { |
2096 | struct ext3_sb_info *sbi = EXT3_SB(sb); |
2097 | |
2098 | if (sbi->s_commit_interval) |
2099 | journal->j_commit_interval = sbi->s_commit_interval; |
2100 | /* We could also set up an ext3-specific default for the commit |
2101 | * interval here, but for now we'll just fall back to the jbd |
2102 | * default. */ |
2103 | |
2104 | spin_lock(&journal->j_state_lock); |
2105 | if (test_opt(sb, BARRIER)) |
2106 | journal->j_flags |= JFS_BARRIER; |
2107 | else |
2108 | journal->j_flags &= ~JFS_BARRIER; |
2109 | if (test_opt(sb, DATA_ERR_ABORT)) |
2110 | journal->j_flags |= JFS_ABORT_ON_SYNCDATA_ERR; |
2111 | else |
2112 | journal->j_flags &= ~JFS_ABORT_ON_SYNCDATA_ERR; |
2113 | spin_unlock(&journal->j_state_lock); |
2114 | } |
2115 | |
2116 | static journal_t *ext3_get_journal(struct super_block *sb, |
2117 | unsigned int journal_inum) |
2118 | { |
2119 | struct inode *journal_inode; |
2120 | journal_t *journal; |
2121 | |
2122 | /* First, test for the existence of a valid inode on disk. Bad |
2123 | * things happen if we iget() an unused inode, as the subsequent |
2124 | * iput() will try to delete it. */ |
2125 | |
2126 | journal_inode = ext3_iget(sb, journal_inum); |
2127 | if (IS_ERR(journal_inode)) { |
2128 | ext3_msg(sb, KERN_ERR, "error: no journal found"); |
2129 | return NULL; |
2130 | } |
2131 | if (!journal_inode->i_nlink) { |
2132 | make_bad_inode(journal_inode); |
2133 | iput(journal_inode); |
2134 | ext3_msg(sb, KERN_ERR, "error: journal inode is deleted"); |
2135 | return NULL; |
2136 | } |
2137 | |
2138 | jbd_debug(2, "Journal inode found at %p: %Ld bytes\n", |
2139 | journal_inode, journal_inode->i_size); |
2140 | if (!S_ISREG(journal_inode->i_mode)) { |
2141 | ext3_msg(sb, KERN_ERR, "error: invalid journal inode"); |
2142 | iput(journal_inode); |
2143 | return NULL; |
2144 | } |
2145 | |
2146 | journal = journal_init_inode(journal_inode); |
2147 | if (!journal) { |
2148 | ext3_msg(sb, KERN_ERR, "error: could not load journal inode"); |
2149 | iput(journal_inode); |
2150 | return NULL; |
2151 | } |
2152 | journal->j_private = sb; |
2153 | ext3_init_journal_params(sb, journal); |
2154 | return journal; |
2155 | } |
2156 | |
2157 | static journal_t *ext3_get_dev_journal(struct super_block *sb, |
2158 | dev_t j_dev) |
2159 | { |
2160 | struct buffer_head * bh; |
2161 | journal_t *journal; |
2162 | ext3_fsblk_t start; |
2163 | ext3_fsblk_t len; |
2164 | int hblock, blocksize; |
2165 | ext3_fsblk_t sb_block; |
2166 | unsigned long offset; |
2167 | struct ext3_super_block * es; |
2168 | struct block_device *bdev; |
2169 | |
2170 | bdev = ext3_blkdev_get(j_dev, sb); |
2171 | if (bdev == NULL) |
2172 | return NULL; |
2173 | |
2174 | blocksize = sb->s_blocksize; |
2175 | hblock = bdev_logical_block_size(bdev); |
2176 | if (blocksize < hblock) { |
2177 | ext3_msg(sb, KERN_ERR, |
2178 | "error: blocksize too small for journal device"); |
2179 | goto out_bdev; |
2180 | } |
2181 | |
2182 | sb_block = EXT3_MIN_BLOCK_SIZE / blocksize; |
2183 | offset = EXT3_MIN_BLOCK_SIZE % blocksize; |
2184 | set_blocksize(bdev, blocksize); |
2185 | if (!(bh = __bread(bdev, sb_block, blocksize))) { |
2186 | ext3_msg(sb, KERN_ERR, "error: couldn't read superblock of " |
2187 | "external journal"); |
2188 | goto out_bdev; |
2189 | } |
2190 | |
2191 | es = (struct ext3_super_block *) (bh->b_data + offset); |
2192 | if ((le16_to_cpu(es->s_magic) != EXT3_SUPER_MAGIC) || |
2193 | !(le32_to_cpu(es->s_feature_incompat) & |
2194 | EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) { |
2195 | ext3_msg(sb, KERN_ERR, "error: external journal has " |
2196 | "bad superblock"); |
2197 | brelse(bh); |
2198 | goto out_bdev; |
2199 | } |
2200 | |
2201 | if (memcmp(EXT3_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) { |
2202 | ext3_msg(sb, KERN_ERR, "error: journal UUID does not match"); |
2203 | brelse(bh); |
2204 | goto out_bdev; |
2205 | } |
2206 | |
2207 | len = le32_to_cpu(es->s_blocks_count); |
2208 | start = sb_block + 1; |
2209 | brelse(bh); /* we're done with the superblock */ |
2210 | |
2211 | journal = journal_init_dev(bdev, sb->s_bdev, |
2212 | start, len, blocksize); |
2213 | if (!journal) { |
2214 | ext3_msg(sb, KERN_ERR, |
2215 | "error: failed to create device journal"); |
2216 | goto out_bdev; |
2217 | } |
2218 | journal->j_private = sb; |
2219 | ll_rw_block(READ, 1, &journal->j_sb_buffer); |
2220 | wait_on_buffer(journal->j_sb_buffer); |
2221 | if (!buffer_uptodate(journal->j_sb_buffer)) { |
2222 | ext3_msg(sb, KERN_ERR, "I/O error on journal device"); |
2223 | goto out_journal; |
2224 | } |
2225 | if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) { |
2226 | ext3_msg(sb, KERN_ERR, |
2227 | "error: external journal has more than one " |
2228 | "user (unsupported) - %d", |
2229 | be32_to_cpu(journal->j_superblock->s_nr_users)); |
2230 | goto out_journal; |
2231 | } |
2232 | EXT3_SB(sb)->journal_bdev = bdev; |
2233 | ext3_init_journal_params(sb, journal); |
2234 | return journal; |
2235 | out_journal: |
2236 | journal_destroy(journal); |
2237 | out_bdev: |
2238 | ext3_blkdev_put(bdev); |
2239 | return NULL; |
2240 | } |
2241 | |
2242 | static int ext3_load_journal(struct super_block *sb, |
2243 | struct ext3_super_block *es, |
2244 | unsigned long journal_devnum) |
2245 | { |
2246 | journal_t *journal; |
2247 | unsigned int journal_inum = le32_to_cpu(es->s_journal_inum); |
2248 | dev_t journal_dev; |
2249 | int err = 0; |
2250 | int really_read_only; |
2251 | |
2252 | if (journal_devnum && |
2253 | journal_devnum != le32_to_cpu(es->s_journal_dev)) { |
2254 | ext3_msg(sb, KERN_INFO, "external journal device major/minor " |
2255 | "numbers have changed"); |
2256 | journal_dev = new_decode_dev(journal_devnum); |
2257 | } else |
2258 | journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev)); |
2259 | |
2260 | really_read_only = bdev_read_only(sb->s_bdev); |
2261 | |
2262 | /* |
2263 | * Are we loading a blank journal or performing recovery after a |
2264 | * crash? For recovery, we need to check in advance whether we |
2265 | * can get read-write access to the device. |
2266 | */ |
2267 | |
2268 | if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER)) { |
2269 | if (sb->s_flags & MS_RDONLY) { |
2270 | ext3_msg(sb, KERN_INFO, |
2271 | "recovery required on readonly filesystem"); |
2272 | if (really_read_only) { |
2273 | ext3_msg(sb, KERN_ERR, "error: write access " |
2274 | "unavailable, cannot proceed"); |
2275 | return -EROFS; |
2276 | } |
2277 | ext3_msg(sb, KERN_INFO, |
2278 | "write access will be enabled during recovery"); |
2279 | } |
2280 | } |
2281 | |
2282 | if (journal_inum && journal_dev) { |
2283 | ext3_msg(sb, KERN_ERR, "error: filesystem has both journal " |
2284 | "and inode journals"); |
2285 | return -EINVAL; |
2286 | } |
2287 | |
2288 | if (journal_inum) { |
2289 | if (!(journal = ext3_get_journal(sb, journal_inum))) |
2290 | return -EINVAL; |
2291 | } else { |
2292 | if (!(journal = ext3_get_dev_journal(sb, journal_dev))) |
2293 | return -EINVAL; |
2294 | } |
2295 | |
2296 | if (!(journal->j_flags & JFS_BARRIER)) |
2297 | printk(KERN_INFO "EXT3-fs: barriers not enabled\n"); |
2298 | |
2299 | if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) { |
2300 | err = journal_update_format(journal); |
2301 | if (err) { |
2302 | ext3_msg(sb, KERN_ERR, "error updating journal"); |
2303 | journal_destroy(journal); |
2304 | return err; |
2305 | } |
2306 | } |
2307 | |
2308 | if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER)) |
2309 | err = journal_wipe(journal, !really_read_only); |
2310 | if (!err) |
2311 | err = journal_load(journal); |
2312 | |
2313 | if (err) { |
2314 | ext3_msg(sb, KERN_ERR, "error loading journal"); |
2315 | journal_destroy(journal); |
2316 | return err; |
2317 | } |
2318 | |
2319 | EXT3_SB(sb)->s_journal = journal; |
2320 | ext3_clear_journal_err(sb, es); |
2321 | |
2322 | if (!really_read_only && journal_devnum && |
2323 | journal_devnum != le32_to_cpu(es->s_journal_dev)) { |
2324 | es->s_journal_dev = cpu_to_le32(journal_devnum); |
2325 | |
2326 | /* Make sure we flush the recovery flag to disk. */ |
2327 | ext3_commit_super(sb, es, 1); |
2328 | } |
2329 | |
2330 | return 0; |
2331 | } |
2332 | |
2333 | static int ext3_create_journal(struct super_block *sb, |
2334 | struct ext3_super_block *es, |
2335 | unsigned int journal_inum) |
2336 | { |
2337 | journal_t *journal; |
2338 | int err; |
2339 | |
2340 | if (sb->s_flags & MS_RDONLY) { |
2341 | ext3_msg(sb, KERN_ERR, |
2342 | "error: readonly filesystem when trying to " |
2343 | "create journal"); |
2344 | return -EROFS; |
2345 | } |
2346 | |
2347 | journal = ext3_get_journal(sb, journal_inum); |
2348 | if (!journal) |
2349 | return -EINVAL; |
2350 | |
2351 | ext3_msg(sb, KERN_INFO, "creating new journal on inode %u", |
2352 | journal_inum); |
2353 | |
2354 | err = journal_create(journal); |
2355 | if (err) { |
2356 | ext3_msg(sb, KERN_ERR, "error creating journal"); |
2357 | journal_destroy(journal); |
2358 | return -EIO; |
2359 | } |
2360 | |
2361 | EXT3_SB(sb)->s_journal = journal; |
2362 | |
2363 | ext3_update_dynamic_rev(sb); |
2364 | EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER); |
2365 | EXT3_SET_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL); |
2366 | |
2367 | es->s_journal_inum = cpu_to_le32(journal_inum); |
2368 | |
2369 | /* Make sure we flush the recovery flag to disk. */ |
2370 | ext3_commit_super(sb, es, 1); |
2371 | |
2372 | return 0; |
2373 | } |
2374 | |
2375 | static int ext3_commit_super(struct super_block *sb, |
2376 | struct ext3_super_block *es, |
2377 | int sync) |
2378 | { |
2379 | struct buffer_head *sbh = EXT3_SB(sb)->s_sbh; |
2380 | int error = 0; |
2381 | |
2382 | if (!sbh) |
2383 | return error; |
2384 | |
2385 | if (buffer_write_io_error(sbh)) { |
2386 | /* |
2387 | * Oh, dear. A previous attempt to write the |
2388 | * superblock failed. This could happen because the |
2389 | * USB device was yanked out. Or it could happen to |
2390 | * be a transient write error and maybe the block will |
2391 | * be remapped. Nothing we can do but to retry the |
2392 | * write and hope for the best. |
2393 | */ |
2394 | ext3_msg(sb, KERN_ERR, "previous I/O error to " |
2395 | "superblock detected"); |
2396 | clear_buffer_write_io_error(sbh); |
2397 | set_buffer_uptodate(sbh); |
2398 | } |
2399 | /* |
2400 | * If the file system is mounted read-only, don't update the |
2401 | * superblock write time. This avoids updating the superblock |
2402 | * write time when we are mounting the root file system |
2403 | * read/only but we need to replay the journal; at that point, |
2404 | * for people who are east of GMT and who make their clock |
2405 | * tick in localtime for Windows bug-for-bug compatibility, |
2406 | * the clock is set in the future, and this will cause e2fsck |
2407 | * to complain and force a full file system check. |
2408 | */ |
2409 | if (!(sb->s_flags & MS_RDONLY)) |
2410 | es->s_wtime = cpu_to_le32(get_seconds()); |
2411 | es->s_free_blocks_count = cpu_to_le32(ext3_count_free_blocks(sb)); |
2412 | es->s_free_inodes_count = cpu_to_le32(ext3_count_free_inodes(sb)); |
2413 | BUFFER_TRACE(sbh, "marking dirty"); |
2414 | mark_buffer_dirty(sbh); |
2415 | if (sync) { |
2416 | error = sync_dirty_buffer(sbh); |
2417 | if (buffer_write_io_error(sbh)) { |
2418 | ext3_msg(sb, KERN_ERR, "I/O error while writing " |
2419 | "superblock"); |
2420 | clear_buffer_write_io_error(sbh); |
2421 | set_buffer_uptodate(sbh); |
2422 | } |
2423 | } |
2424 | return error; |
2425 | } |
2426 | |
2427 | |
2428 | /* |
2429 | * Have we just finished recovery? If so, and if we are mounting (or |
2430 | * remounting) the filesystem readonly, then we will end up with a |
2431 | * consistent fs on disk. Record that fact. |
2432 | */ |
2433 | static void ext3_mark_recovery_complete(struct super_block * sb, |
2434 | struct ext3_super_block * es) |
2435 | { |
2436 | journal_t *journal = EXT3_SB(sb)->s_journal; |
2437 | |
2438 | journal_lock_updates(journal); |
2439 | if (journal_flush(journal) < 0) |
2440 | goto out; |
2441 | |
2442 | if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER) && |
2443 | sb->s_flags & MS_RDONLY) { |
2444 | EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER); |
2445 | ext3_commit_super(sb, es, 1); |
2446 | } |
2447 | |
2448 | out: |
2449 | journal_unlock_updates(journal); |
2450 | } |
2451 | |
2452 | /* |
2453 | * If we are mounting (or read-write remounting) a filesystem whose journal |
2454 | * has recorded an error from a previous lifetime, move that error to the |
2455 | * main filesystem now. |
2456 | */ |
2457 | static void ext3_clear_journal_err(struct super_block *sb, |
2458 | struct ext3_super_block *es) |
2459 | { |
2460 | journal_t *journal; |
2461 | int j_errno; |
2462 | const char *errstr; |
2463 | |
2464 | journal = EXT3_SB(sb)->s_journal; |
2465 | |
2466 | /* |
2467 | * Now check for any error status which may have been recorded in the |
2468 | * journal by a prior ext3_error() or ext3_abort() |
2469 | */ |
2470 | |
2471 | j_errno = journal_errno(journal); |
2472 | if (j_errno) { |
2473 | char nbuf[16]; |
2474 | |
2475 | errstr = ext3_decode_error(sb, j_errno, nbuf); |
2476 | ext3_warning(sb, __func__, "Filesystem error recorded " |
2477 | "from previous mount: %s", errstr); |
2478 | ext3_warning(sb, __func__, "Marking fs in need of " |
2479 | "filesystem check."); |
2480 | |
2481 | EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS; |
2482 | es->s_state |= cpu_to_le16(EXT3_ERROR_FS); |
2483 | ext3_commit_super (sb, es, 1); |
2484 | |
2485 | journal_clear_err(journal); |
2486 | } |
2487 | } |
2488 | |
2489 | /* |
2490 | * Force the running and committing transactions to commit, |
2491 | * and wait on the commit. |
2492 | */ |
2493 | int ext3_force_commit(struct super_block *sb) |
2494 | { |
2495 | journal_t *journal; |
2496 | int ret; |
2497 | |
2498 | if (sb->s_flags & MS_RDONLY) |
2499 | return 0; |
2500 | |
2501 | journal = EXT3_SB(sb)->s_journal; |
2502 | ret = ext3_journal_force_commit(journal); |
2503 | return ret; |
2504 | } |
2505 | |
2506 | static int ext3_sync_fs(struct super_block *sb, int wait) |
2507 | { |
2508 | tid_t target; |
2509 | |
2510 | if (journal_start_commit(EXT3_SB(sb)->s_journal, &target)) { |
2511 | if (wait) |
2512 | log_wait_commit(EXT3_SB(sb)->s_journal, target); |
2513 | } |
2514 | return 0; |
2515 | } |
2516 | |
2517 | /* |
2518 | * LVM calls this function before a (read-only) snapshot is created. This |
2519 | * gives us a chance to flush the journal completely and mark the fs clean. |
2520 | */ |
2521 | static int ext3_freeze(struct super_block *sb) |
2522 | { |
2523 | int error = 0; |
2524 | journal_t *journal; |
2525 | |
2526 | if (!(sb->s_flags & MS_RDONLY)) { |
2527 | journal = EXT3_SB(sb)->s_journal; |
2528 | |
2529 | /* Now we set up the journal barrier. */ |
2530 | journal_lock_updates(journal); |
2531 | |
2532 | /* |
2533 | * We don't want to clear needs_recovery flag when we failed |
2534 | * to flush the journal. |
2535 | */ |
2536 | error = journal_flush(journal); |
2537 | if (error < 0) |
2538 | goto out; |
2539 | |
2540 | /* Journal blocked and flushed, clear needs_recovery flag. */ |
2541 | EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER); |
2542 | error = ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1); |
2543 | if (error) |
2544 | goto out; |
2545 | } |
2546 | return 0; |
2547 | |
2548 | out: |
2549 | journal_unlock_updates(journal); |
2550 | return error; |
2551 | } |
2552 | |
2553 | /* |
2554 | * Called by LVM after the snapshot is done. We need to reset the RECOVER |
2555 | * flag here, even though the filesystem is not technically dirty yet. |
2556 | */ |
2557 | static int ext3_unfreeze(struct super_block *sb) |
2558 | { |
2559 | if (!(sb->s_flags & MS_RDONLY)) { |
2560 | lock_super(sb); |
2561 | /* Reser the needs_recovery flag before the fs is unlocked. */ |
2562 | EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER); |
2563 | ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1); |
2564 | unlock_super(sb); |
2565 | journal_unlock_updates(EXT3_SB(sb)->s_journal); |
2566 | } |
2567 | return 0; |
2568 | } |
2569 | |
2570 | static int ext3_remount (struct super_block * sb, int * flags, char * data) |
2571 | { |
2572 | struct ext3_super_block * es; |
2573 | struct ext3_sb_info *sbi = EXT3_SB(sb); |
2574 | ext3_fsblk_t n_blocks_count = 0; |
2575 | unsigned long old_sb_flags; |
2576 | struct ext3_mount_options old_opts; |
2577 | int enable_quota = 0; |
2578 | int err; |
2579 | #ifdef CONFIG_QUOTA |
2580 | int i; |
2581 | #endif |
2582 | |
2583 | /* Store the original options */ |
2584 | lock_super(sb); |
2585 | old_sb_flags = sb->s_flags; |
2586 | old_opts.s_mount_opt = sbi->s_mount_opt; |
2587 | old_opts.s_resuid = sbi->s_resuid; |
2588 | old_opts.s_resgid = sbi->s_resgid; |
2589 | old_opts.s_commit_interval = sbi->s_commit_interval; |
2590 | #ifdef CONFIG_QUOTA |
2591 | old_opts.s_jquota_fmt = sbi->s_jquota_fmt; |
2592 | for (i = 0; i < MAXQUOTAS; i++) |
2593 | old_opts.s_qf_names[i] = sbi->s_qf_names[i]; |
2594 | #endif |
2595 | |
2596 | /* |
2597 | * Allow the "check" option to be passed as a remount option. |
2598 | */ |
2599 | if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) { |
2600 | err = -EINVAL; |
2601 | goto restore_opts; |
2602 | } |
2603 | |
2604 | if (test_opt(sb, ABORT)) |
2605 | ext3_abort(sb, __func__, "Abort forced by user"); |
2606 | |
2607 | sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | |
2608 | (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0); |
2609 | |
2610 | es = sbi->s_es; |
2611 | |
2612 | ext3_init_journal_params(sb, sbi->s_journal); |
2613 | |
2614 | if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) || |
2615 | n_blocks_count > le32_to_cpu(es->s_blocks_count)) { |
2616 | if (test_opt(sb, ABORT)) { |
2617 | err = -EROFS; |
2618 | goto restore_opts; |
2619 | } |
2620 | |
2621 | if (*flags & MS_RDONLY) { |
2622 | err = dquot_suspend(sb, -1); |
2623 | if (err < 0) |
2624 | goto restore_opts; |
2625 | |
2626 | /* |
2627 | * First of all, the unconditional stuff we have to do |
2628 | * to disable replay of the journal when we next remount |
2629 | */ |
2630 | sb->s_flags |= MS_RDONLY; |
2631 | |
2632 | /* |
2633 | * OK, test if we are remounting a valid rw partition |
2634 | * readonly, and if so set the rdonly flag and then |
2635 | * mark the partition as valid again. |
2636 | */ |
2637 | if (!(es->s_state & cpu_to_le16(EXT3_VALID_FS)) && |
2638 | (sbi->s_mount_state & EXT3_VALID_FS)) |
2639 | es->s_state = cpu_to_le16(sbi->s_mount_state); |
2640 | |
2641 | ext3_mark_recovery_complete(sb, es); |
2642 | } else { |
2643 | __le32 ret; |
2644 | if ((ret = EXT3_HAS_RO_COMPAT_FEATURE(sb, |
2645 | ~EXT3_FEATURE_RO_COMPAT_SUPP))) { |
2646 | ext3_msg(sb, KERN_WARNING, |
2647 | "warning: couldn't remount RDWR " |
2648 | "because of unsupported optional " |
2649 | "features (%x)", le32_to_cpu(ret)); |
2650 | err = -EROFS; |
2651 | goto restore_opts; |
2652 | } |
2653 | |
2654 | /* |
2655 | * If we have an unprocessed orphan list hanging |
2656 | * around from a previously readonly bdev mount, |
2657 | * require a full umount/remount for now. |
2658 | */ |
2659 | if (es->s_last_orphan) { |
2660 | ext3_msg(sb, KERN_WARNING, "warning: couldn't " |
2661 | "remount RDWR because of unprocessed " |
2662 | "orphan inode list. Please " |
2663 | "umount/remount instead."); |
2664 | err = -EINVAL; |
2665 | goto restore_opts; |
2666 | } |
2667 | |
2668 | /* |
2669 | * Mounting a RDONLY partition read-write, so reread |
2670 | * and store the current valid flag. (It may have |
2671 | * been changed by e2fsck since we originally mounted |
2672 | * the partition.) |
2673 | */ |
2674 | ext3_clear_journal_err(sb, es); |
2675 | sbi->s_mount_state = le16_to_cpu(es->s_state); |
2676 | if ((err = ext3_group_extend(sb, es, n_blocks_count))) |
2677 | goto restore_opts; |
2678 | if (!ext3_setup_super (sb, es, 0)) |
2679 | sb->s_flags &= ~MS_RDONLY; |
2680 | enable_quota = 1; |
2681 | } |
2682 | } |
2683 | #ifdef CONFIG_QUOTA |
2684 | /* Release old quota file names */ |
2685 | for (i = 0; i < MAXQUOTAS; i++) |
2686 | if (old_opts.s_qf_names[i] && |
2687 | old_opts.s_qf_names[i] != sbi->s_qf_names[i]) |
2688 | kfree(old_opts.s_qf_names[i]); |
2689 | #endif |
2690 | unlock_super(sb); |
2691 | |
2692 | if (enable_quota) |
2693 | dquot_resume(sb, -1); |
2694 | return 0; |
2695 | restore_opts: |
2696 | sb->s_flags = old_sb_flags; |
2697 | sbi->s_mount_opt = old_opts.s_mount_opt; |
2698 | sbi->s_resuid = old_opts.s_resuid; |
2699 | sbi->s_resgid = old_opts.s_resgid; |
2700 | sbi->s_commit_interval = old_opts.s_commit_interval; |
2701 | #ifdef CONFIG_QUOTA |
2702 | sbi->s_jquota_fmt = old_opts.s_jquota_fmt; |
2703 | for (i = 0; i < MAXQUOTAS; i++) { |
2704 | if (sbi->s_qf_names[i] && |
2705 | old_opts.s_qf_names[i] != sbi->s_qf_names[i]) |
2706 | kfree(sbi->s_qf_names[i]); |
2707 | sbi->s_qf_names[i] = old_opts.s_qf_names[i]; |
2708 | } |
2709 | #endif |
2710 | unlock_super(sb); |
2711 | return err; |
2712 | } |
2713 | |
2714 | static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf) |
2715 | { |
2716 | struct super_block *sb = dentry->d_sb; |
2717 | struct ext3_sb_info *sbi = EXT3_SB(sb); |
2718 | struct ext3_super_block *es = sbi->s_es; |
2719 | u64 fsid; |
2720 | |
2721 | if (test_opt(sb, MINIX_DF)) { |
2722 | sbi->s_overhead_last = 0; |
2723 | } else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) { |
2724 | unsigned long ngroups = sbi->s_groups_count, i; |
2725 | ext3_fsblk_t overhead = 0; |
2726 | smp_rmb(); |
2727 | |
2728 | /* |
2729 | * Compute the overhead (FS structures). This is constant |
2730 | * for a given filesystem unless the number of block groups |
2731 | * changes so we cache the previous value until it does. |
2732 | */ |
2733 | |
2734 | /* |
2735 | * All of the blocks before first_data_block are |
2736 | * overhead |
2737 | */ |
2738 | overhead = le32_to_cpu(es->s_first_data_block); |
2739 | |
2740 | /* |
2741 | * Add the overhead attributed to the superblock and |
2742 | * block group descriptors. If the sparse superblocks |
2743 | * feature is turned on, then not all groups have this. |
2744 | */ |
2745 | for (i = 0; i < ngroups; i++) { |
2746 | overhead += ext3_bg_has_super(sb, i) + |
2747 | ext3_bg_num_gdb(sb, i); |
2748 | cond_resched(); |
2749 | } |
2750 | |
2751 | /* |
2752 | * Every block group has an inode bitmap, a block |
2753 | * bitmap, and an inode table. |
2754 | */ |
2755 | overhead += ngroups * (2 + sbi->s_itb_per_group); |
2756 | sbi->s_overhead_last = overhead; |
2757 | smp_wmb(); |
2758 | sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count); |
2759 | } |
2760 | |
2761 | buf->f_type = EXT3_SUPER_MAGIC; |
2762 | buf->f_bsize = sb->s_blocksize; |
2763 | buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last; |
2764 | buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter); |
2765 | buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count); |
2766 | if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count)) |
2767 | buf->f_bavail = 0; |
2768 | buf->f_files = le32_to_cpu(es->s_inodes_count); |
2769 | buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter); |
2770 | buf->f_namelen = EXT3_NAME_LEN; |
2771 | fsid = le64_to_cpup((void *)es->s_uuid) ^ |
2772 | le64_to_cpup((void *)es->s_uuid + sizeof(u64)); |
2773 | buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL; |
2774 | buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL; |
2775 | return 0; |
2776 | } |
2777 | |
2778 | /* Helper function for writing quotas on sync - we need to start transaction before quota file |
2779 | * is locked for write. Otherwise the are possible deadlocks: |
2780 | * Process 1 Process 2 |
2781 | * ext3_create() quota_sync() |
2782 | * journal_start() write_dquot() |
2783 | * dquot_initialize() down(dqio_mutex) |
2784 | * down(dqio_mutex) journal_start() |
2785 | * |
2786 | */ |
2787 | |
2788 | #ifdef CONFIG_QUOTA |
2789 | |
2790 | static inline struct inode *dquot_to_inode(struct dquot *dquot) |
2791 | { |
2792 | return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type]; |
2793 | } |
2794 | |
2795 | static int ext3_write_dquot(struct dquot *dquot) |
2796 | { |
2797 | int ret, err; |
2798 | handle_t *handle; |
2799 | struct inode *inode; |
2800 | |
2801 | inode = dquot_to_inode(dquot); |
2802 | handle = ext3_journal_start(inode, |
2803 | EXT3_QUOTA_TRANS_BLOCKS(dquot->dq_sb)); |
2804 | if (IS_ERR(handle)) |
2805 | return PTR_ERR(handle); |
2806 | ret = dquot_commit(dquot); |
2807 | err = ext3_journal_stop(handle); |
2808 | if (!ret) |
2809 | ret = err; |
2810 | return ret; |
2811 | } |
2812 | |
2813 | static int ext3_acquire_dquot(struct dquot *dquot) |
2814 | { |
2815 | int ret, err; |
2816 | handle_t *handle; |
2817 | |
2818 | handle = ext3_journal_start(dquot_to_inode(dquot), |
2819 | EXT3_QUOTA_INIT_BLOCKS(dquot->dq_sb)); |
2820 | if (IS_ERR(handle)) |
2821 | return PTR_ERR(handle); |
2822 | ret = dquot_acquire(dquot); |
2823 | err = ext3_journal_stop(handle); |
2824 | if (!ret) |
2825 | ret = err; |
2826 | return ret; |
2827 | } |
2828 | |
2829 | static int ext3_release_dquot(struct dquot *dquot) |
2830 | { |
2831 | int ret, err; |
2832 | handle_t *handle; |
2833 | |
2834 | handle = ext3_journal_start(dquot_to_inode(dquot), |
2835 | EXT3_QUOTA_DEL_BLOCKS(dquot->dq_sb)); |
2836 | if (IS_ERR(handle)) { |
2837 | /* Release dquot anyway to avoid endless cycle in dqput() */ |
2838 | dquot_release(dquot); |
2839 | return PTR_ERR(handle); |
2840 | } |
2841 | ret = dquot_release(dquot); |
2842 | err = ext3_journal_stop(handle); |
2843 | if (!ret) |
2844 | ret = err; |
2845 | return ret; |
2846 | } |
2847 | |
2848 | static int ext3_mark_dquot_dirty(struct dquot *dquot) |
2849 | { |
2850 | /* Are we journaling quotas? */ |
2851 | if (EXT3_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] || |
2852 | EXT3_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) { |
2853 | dquot_mark_dquot_dirty(dquot); |
2854 | return ext3_write_dquot(dquot); |
2855 | } else { |
2856 | return dquot_mark_dquot_dirty(dquot); |
2857 | } |
2858 | } |
2859 | |
2860 | static int ext3_write_info(struct super_block *sb, int type) |
2861 | { |
2862 | int ret, err; |
2863 | handle_t *handle; |
2864 | |
2865 | /* Data block + inode block */ |
2866 | handle = ext3_journal_start(sb->s_root->d_inode, 2); |
2867 | if (IS_ERR(handle)) |
2868 | return PTR_ERR(handle); |
2869 | ret = dquot_commit_info(sb, type); |
2870 | err = ext3_journal_stop(handle); |
2871 | if (!ret) |
2872 | ret = err; |
2873 | return ret; |
2874 | } |
2875 | |
2876 | /* |
2877 | * Turn on quotas during mount time - we need to find |
2878 | * the quota file and such... |
2879 | */ |
2880 | static int ext3_quota_on_mount(struct super_block *sb, int type) |
2881 | { |
2882 | return dquot_quota_on_mount(sb, EXT3_SB(sb)->s_qf_names[type], |
2883 | EXT3_SB(sb)->s_jquota_fmt, type); |
2884 | } |
2885 | |
2886 | /* |
2887 | * Standard function to be called on quota_on |
2888 | */ |
2889 | static int ext3_quota_on(struct super_block *sb, int type, int format_id, |
2890 | struct path *path) |
2891 | { |
2892 | int err; |
2893 | |
2894 | if (!test_opt(sb, QUOTA)) |
2895 | return -EINVAL; |
2896 | |
2897 | /* Quotafile not on the same filesystem? */ |
2898 | if (path->mnt->mnt_sb != sb) |
2899 | return -EXDEV; |
2900 | /* Journaling quota? */ |
2901 | if (EXT3_SB(sb)->s_qf_names[type]) { |
2902 | /* Quotafile not of fs root? */ |
2903 | if (path->dentry->d_parent != sb->s_root) |
2904 | ext3_msg(sb, KERN_WARNING, |
2905 | "warning: Quota file not on filesystem root. " |
2906 | "Journaled quota will not work."); |
2907 | } |
2908 | |
2909 | /* |
2910 | * When we journal data on quota file, we have to flush journal to see |
2911 | * all updates to the file when we bypass pagecache... |
2912 | */ |
2913 | if (ext3_should_journal_data(path->dentry->d_inode)) { |
2914 | /* |
2915 | * We don't need to lock updates but journal_flush() could |
2916 | * otherwise be livelocked... |
2917 | */ |
2918 | journal_lock_updates(EXT3_SB(sb)->s_journal); |
2919 | err = journal_flush(EXT3_SB(sb)->s_journal); |
2920 | journal_unlock_updates(EXT3_SB(sb)->s_journal); |
2921 | if (err) |
2922 | return err; |
2923 | } |
2924 | |
2925 | return dquot_quota_on(sb, type, format_id, path); |
2926 | } |
2927 | |
2928 | /* Read data from quotafile - avoid pagecache and such because we cannot afford |
2929 | * acquiring the locks... As quota files are never truncated and quota code |
2930 | * itself serializes the operations (and no one else should touch the files) |
2931 | * we don't have to be afraid of races */ |
2932 | static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data, |
2933 | size_t len, loff_t off) |
2934 | { |
2935 | struct inode *inode = sb_dqopt(sb)->files[type]; |
2936 | sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb); |
2937 | int err = 0; |
2938 | int offset = off & (sb->s_blocksize - 1); |
2939 | int tocopy; |
2940 | size_t toread; |
2941 | struct buffer_head *bh; |
2942 | loff_t i_size = i_size_read(inode); |
2943 | |
2944 | if (off > i_size) |
2945 | return 0; |
2946 | if (off+len > i_size) |
2947 | len = i_size-off; |
2948 | toread = len; |
2949 | while (toread > 0) { |
2950 | tocopy = sb->s_blocksize - offset < toread ? |
2951 | sb->s_blocksize - offset : toread; |
2952 | bh = ext3_bread(NULL, inode, blk, 0, &err); |
2953 | if (err) |
2954 | return err; |
2955 | if (!bh) /* A hole? */ |
2956 | memset(data, 0, tocopy); |
2957 | else |
2958 | memcpy(data, bh->b_data+offset, tocopy); |
2959 | brelse(bh); |
2960 | offset = 0; |
2961 | toread -= tocopy; |
2962 | data += tocopy; |
2963 | blk++; |
2964 | } |
2965 | return len; |
2966 | } |
2967 | |
2968 | /* Write to quotafile (we know the transaction is already started and has |
2969 | * enough credits) */ |
2970 | static ssize_t ext3_quota_write(struct super_block *sb, int type, |
2971 | const char *data, size_t len, loff_t off) |
2972 | { |
2973 | struct inode *inode = sb_dqopt(sb)->files[type]; |
2974 | sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb); |
2975 | int err = 0; |
2976 | int offset = off & (sb->s_blocksize - 1); |
2977 | int journal_quota = EXT3_SB(sb)->s_qf_names[type] != NULL; |
2978 | struct buffer_head *bh; |
2979 | handle_t *handle = journal_current_handle(); |
2980 | |
2981 | if (!handle) { |
2982 | ext3_msg(sb, KERN_WARNING, |
2983 | "warning: quota write (off=%llu, len=%llu)" |
2984 | " cancelled because transaction is not started.", |
2985 | (unsigned long long)off, (unsigned long long)len); |
2986 | return -EIO; |
2987 | } |
2988 | |
2989 | /* |
2990 | * Since we account only one data block in transaction credits, |
2991 | * then it is impossible to cross a block boundary. |
2992 | */ |
2993 | if (sb->s_blocksize - offset < len) { |
2994 | ext3_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)" |
2995 | " cancelled because not block aligned", |
2996 | (unsigned long long)off, (unsigned long long)len); |
2997 | return -EIO; |
2998 | } |
2999 | mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA); |
3000 | bh = ext3_bread(handle, inode, blk, 1, &err); |
3001 | if (!bh) |
3002 | goto out; |
3003 | if (journal_quota) { |
3004 | err = ext3_journal_get_write_access(handle, bh); |
3005 | if (err) { |
3006 | brelse(bh); |
3007 | goto out; |
3008 | } |
3009 | } |
3010 | lock_buffer(bh); |
3011 | memcpy(bh->b_data+offset, data, len); |
3012 | flush_dcache_page(bh->b_page); |
3013 | unlock_buffer(bh); |
3014 | if (journal_quota) |
3015 | err = ext3_journal_dirty_metadata(handle, bh); |
3016 | else { |
3017 | /* Always do at least ordered writes for quotas */ |
3018 | err = ext3_journal_dirty_data(handle, bh); |
3019 | mark_buffer_dirty(bh); |
3020 | } |
3021 | brelse(bh); |
3022 | out: |
3023 | if (err) { |
3024 | mutex_unlock(&inode->i_mutex); |
3025 | return err; |
3026 | } |
3027 | if (inode->i_size < off + len) { |
3028 | i_size_write(inode, off + len); |
3029 | EXT3_I(inode)->i_disksize = inode->i_size; |
3030 | } |
3031 | inode->i_version++; |
3032 | inode->i_mtime = inode->i_ctime = CURRENT_TIME; |
3033 | ext3_mark_inode_dirty(handle, inode); |
3034 | mutex_unlock(&inode->i_mutex); |
3035 | return len; |
3036 | } |
3037 | |
3038 | #endif |
3039 | |
3040 | static struct dentry *ext3_mount(struct file_system_type *fs_type, |
3041 | int flags, const char *dev_name, void *data) |
3042 | { |
3043 | return mount_bdev(fs_type, flags, dev_name, data, ext3_fill_super); |
3044 | } |
3045 | |
3046 | static struct file_system_type ext3_fs_type = { |
3047 | .owner = THIS_MODULE, |
3048 | .name = "ext3", |
3049 | .mount = ext3_mount, |
3050 | .kill_sb = kill_block_super, |
3051 | .fs_flags = FS_REQUIRES_DEV, |
3052 | }; |
3053 | |
3054 | static int __init init_ext3_fs(void) |
3055 | { |
3056 | int err = init_ext3_xattr(); |
3057 | if (err) |
3058 | return err; |
3059 | err = init_inodecache(); |
3060 | if (err) |
3061 | goto out1; |
3062 | err = register_filesystem(&ext3_fs_type); |
3063 | if (err) |
3064 | goto out; |
3065 | return 0; |
3066 | out: |
3067 | destroy_inodecache(); |
3068 | out1: |
3069 | exit_ext3_xattr(); |
3070 | return err; |
3071 | } |
3072 | |
3073 | static void __exit exit_ext3_fs(void) |
3074 | { |
3075 | unregister_filesystem(&ext3_fs_type); |
3076 | destroy_inodecache(); |
3077 | exit_ext3_xattr(); |
3078 | } |
3079 | |
3080 | MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others"); |
3081 | MODULE_DESCRIPTION("Second Extended Filesystem with journaling extensions"); |
3082 | MODULE_LICENSE("GPL"); |
3083 | module_init(init_ext3_fs) |
3084 | module_exit(exit_ext3_fs) |
3085 |
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