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1da177e4 LT |
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 | ||
1da177e4 LT |
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/smp_lock.h> | |
31 | #include <linux/buffer_head.h> | |
32 | #include <linux/vfs.h> | |
33 | #include <linux/random.h> | |
34 | #include <linux/mount.h> | |
35 | #include <linux/namei.h> | |
36 | #include <linux/quotaops.h> | |
8fc2751b | 37 | #include <linux/seq_file.h> |
381be254 | 38 | |
1da177e4 | 39 | #include <asm/uaccess.h> |
381be254 | 40 | |
1da177e4 LT |
41 | #include "xattr.h" |
42 | #include "acl.h" | |
381be254 | 43 | #include "namei.h" |
1da177e4 | 44 | |
71b96257 JL |
45 | static int ext3_load_journal(struct super_block *, struct ext3_super_block *, |
46 | unsigned long journal_devnum); | |
1da177e4 | 47 | static int ext3_create_journal(struct super_block *, struct ext3_super_block *, |
eee194e7 | 48 | unsigned int); |
1da177e4 LT |
49 | static void ext3_commit_super (struct super_block * sb, |
50 | struct ext3_super_block * es, | |
51 | int sync); | |
52 | static void ext3_mark_recovery_complete(struct super_block * sb, | |
53 | struct ext3_super_block * es); | |
54 | static void ext3_clear_journal_err(struct super_block * sb, | |
55 | struct ext3_super_block * es); | |
56 | static int ext3_sync_fs(struct super_block *sb, int wait); | |
57 | static const char *ext3_decode_error(struct super_block * sb, int errno, | |
58 | char nbuf[16]); | |
59 | static int ext3_remount (struct super_block * sb, int * flags, char * data); | |
726c3342 | 60 | static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf); |
1da177e4 LT |
61 | static void ext3_unlockfs(struct super_block *sb); |
62 | static void ext3_write_super (struct super_block * sb); | |
63 | static void ext3_write_super_lockfs(struct super_block *sb); | |
64 | ||
ae6ddcc5 | 65 | /* |
1da177e4 LT |
66 | * Wrappers for journal_start/end. |
67 | * | |
68 | * The only special thing we need to do here is to make sure that all | |
69 | * journal_end calls result in the superblock being marked dirty, so | |
70 | * that sync() will call the filesystem's write_super callback if | |
ae6ddcc5 | 71 | * appropriate. |
1da177e4 LT |
72 | */ |
73 | handle_t *ext3_journal_start_sb(struct super_block *sb, int nblocks) | |
74 | { | |
75 | journal_t *journal; | |
76 | ||
77 | if (sb->s_flags & MS_RDONLY) | |
78 | return ERR_PTR(-EROFS); | |
79 | ||
80 | /* Special case here: if the journal has aborted behind our | |
81 | * backs (eg. EIO in the commit thread), then we still need to | |
82 | * take the FS itself readonly cleanly. */ | |
83 | journal = EXT3_SB(sb)->s_journal; | |
84 | if (is_journal_aborted(journal)) { | |
85 | ext3_abort(sb, __FUNCTION__, | |
86 | "Detected aborted journal"); | |
87 | return ERR_PTR(-EROFS); | |
88 | } | |
89 | ||
90 | return journal_start(journal, nblocks); | |
91 | } | |
92 | ||
ae6ddcc5 | 93 | /* |
1da177e4 LT |
94 | * The only special thing we need to do here is to make sure that all |
95 | * journal_stop calls result in the superblock being marked dirty, so | |
96 | * that sync() will call the filesystem's write_super callback if | |
ae6ddcc5 | 97 | * appropriate. |
1da177e4 LT |
98 | */ |
99 | int __ext3_journal_stop(const char *where, handle_t *handle) | |
100 | { | |
101 | struct super_block *sb; | |
102 | int err; | |
103 | int rc; | |
104 | ||
105 | sb = handle->h_transaction->t_journal->j_private; | |
106 | err = handle->h_err; | |
107 | rc = journal_stop(handle); | |
108 | ||
109 | if (!err) | |
110 | err = rc; | |
111 | if (err) | |
112 | __ext3_std_error(sb, where, err); | |
113 | return err; | |
114 | } | |
115 | ||
116 | void ext3_journal_abort_handle(const char *caller, const char *err_fn, | |
117 | struct buffer_head *bh, handle_t *handle, int err) | |
118 | { | |
119 | char nbuf[16]; | |
120 | const char *errstr = ext3_decode_error(NULL, err, nbuf); | |
121 | ||
122 | if (bh) | |
123 | BUFFER_TRACE(bh, "abort"); | |
124 | ||
125 | if (!handle->h_err) | |
126 | handle->h_err = err; | |
127 | ||
128 | if (is_handle_aborted(handle)) | |
129 | return; | |
130 | ||
131 | printk(KERN_ERR "%s: aborting transaction: %s in %s\n", | |
132 | caller, errstr, err_fn); | |
133 | ||
134 | journal_abort_handle(handle); | |
135 | } | |
136 | ||
137 | /* Deal with the reporting of failure conditions on a filesystem such as | |
138 | * inconsistencies detected or read IO failures. | |
139 | * | |
140 | * On ext2, we can store the error state of the filesystem in the | |
141 | * superblock. That is not possible on ext3, because we may have other | |
142 | * write ordering constraints on the superblock which prevent us from | |
143 | * writing it out straight away; and given that the journal is about to | |
144 | * be aborted, we can't rely on the current, or future, transactions to | |
145 | * write out the superblock safely. | |
146 | * | |
147 | * We'll just use the journal_abort() error code to record an error in | |
148 | * the journal instead. On recovery, the journal will compain about | |
149 | * that error until we've noted it down and cleared it. | |
150 | */ | |
151 | ||
152 | static void ext3_handle_error(struct super_block *sb) | |
153 | { | |
154 | struct ext3_super_block *es = EXT3_SB(sb)->s_es; | |
155 | ||
156 | EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS; | |
157 | es->s_state |= cpu_to_le16(EXT3_ERROR_FS); | |
158 | ||
159 | if (sb->s_flags & MS_RDONLY) | |
160 | return; | |
161 | ||
7543fc7b | 162 | if (!test_opt (sb, ERRORS_CONT)) { |
1da177e4 LT |
163 | journal_t *journal = EXT3_SB(sb)->s_journal; |
164 | ||
165 | EXT3_SB(sb)->s_mount_opt |= EXT3_MOUNT_ABORT; | |
166 | if (journal) | |
167 | journal_abort(journal, -EIO); | |
168 | } | |
7543fc7b VA |
169 | if (test_opt (sb, ERRORS_RO)) { |
170 | printk (KERN_CRIT "Remounting filesystem read-only\n"); | |
171 | sb->s_flags |= MS_RDONLY; | |
172 | } | |
173 | ext3_commit_super(sb, es, 1); | |
1da177e4 LT |
174 | if (test_opt(sb, ERRORS_PANIC)) |
175 | panic("EXT3-fs (device %s): panic forced after error\n", | |
176 | sb->s_id); | |
1da177e4 LT |
177 | } |
178 | ||
179 | void ext3_error (struct super_block * sb, const char * function, | |
180 | const char * fmt, ...) | |
181 | { | |
182 | va_list args; | |
183 | ||
184 | va_start(args, fmt); | |
185 | printk(KERN_CRIT "EXT3-fs error (device %s): %s: ",sb->s_id, function); | |
186 | vprintk(fmt, args); | |
187 | printk("\n"); | |
188 | va_end(args); | |
189 | ||
190 | ext3_handle_error(sb); | |
191 | } | |
192 | ||
193 | static const char *ext3_decode_error(struct super_block * sb, int errno, | |
194 | char nbuf[16]) | |
195 | { | |
196 | char *errstr = NULL; | |
197 | ||
198 | switch (errno) { | |
199 | case -EIO: | |
200 | errstr = "IO failure"; | |
201 | break; | |
202 | case -ENOMEM: | |
203 | errstr = "Out of memory"; | |
204 | break; | |
205 | case -EROFS: | |
206 | if (!sb || EXT3_SB(sb)->s_journal->j_flags & JFS_ABORT) | |
207 | errstr = "Journal has aborted"; | |
208 | else | |
209 | errstr = "Readonly filesystem"; | |
210 | break; | |
211 | default: | |
212 | /* If the caller passed in an extra buffer for unknown | |
213 | * errors, textualise them now. Else we just return | |
214 | * NULL. */ | |
215 | if (nbuf) { | |
216 | /* Check for truncated error codes... */ | |
217 | if (snprintf(nbuf, 16, "error %d", -errno) >= 0) | |
218 | errstr = nbuf; | |
219 | } | |
220 | break; | |
221 | } | |
222 | ||
223 | return errstr; | |
224 | } | |
225 | ||
226 | /* __ext3_std_error decodes expected errors from journaling functions | |
227 | * automatically and invokes the appropriate error response. */ | |
228 | ||
229 | void __ext3_std_error (struct super_block * sb, const char * function, | |
230 | int errno) | |
231 | { | |
232 | char nbuf[16]; | |
30121624 | 233 | const char *errstr; |
1da177e4 | 234 | |
30121624 ST |
235 | /* Special case: if the error is EROFS, and we're not already |
236 | * inside a transaction, then there's really no point in logging | |
237 | * an error. */ | |
238 | if (errno == -EROFS && journal_current_handle() == NULL && | |
239 | (sb->s_flags & MS_RDONLY)) | |
240 | return; | |
241 | ||
242 | errstr = ext3_decode_error(sb, errno, nbuf); | |
1da177e4 LT |
243 | printk (KERN_CRIT "EXT3-fs error (device %s) in %s: %s\n", |
244 | sb->s_id, function, errstr); | |
245 | ||
246 | ext3_handle_error(sb); | |
247 | } | |
248 | ||
249 | /* | |
250 | * ext3_abort is a much stronger failure handler than ext3_error. The | |
251 | * abort function may be used to deal with unrecoverable failures such | |
252 | * as journal IO errors or ENOMEM at a critical moment in log management. | |
253 | * | |
254 | * We unconditionally force the filesystem into an ABORT|READONLY state, | |
255 | * unless the error response on the fs has been set to panic in which | |
256 | * case we take the easy way out and panic immediately. | |
257 | */ | |
258 | ||
259 | void ext3_abort (struct super_block * sb, const char * function, | |
260 | const char * fmt, ...) | |
261 | { | |
262 | va_list args; | |
263 | ||
264 | printk (KERN_CRIT "ext3_abort called.\n"); | |
265 | ||
266 | va_start(args, fmt); | |
267 | printk(KERN_CRIT "EXT3-fs error (device %s): %s: ",sb->s_id, function); | |
268 | vprintk(fmt, args); | |
269 | printk("\n"); | |
270 | va_end(args); | |
271 | ||
272 | if (test_opt(sb, ERRORS_PANIC)) | |
273 | panic("EXT3-fs panic from previous error\n"); | |
274 | ||
275 | if (sb->s_flags & MS_RDONLY) | |
276 | return; | |
277 | ||
278 | printk(KERN_CRIT "Remounting filesystem read-only\n"); | |
279 | EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS; | |
280 | sb->s_flags |= MS_RDONLY; | |
281 | EXT3_SB(sb)->s_mount_opt |= EXT3_MOUNT_ABORT; | |
282 | journal_abort(EXT3_SB(sb)->s_journal, -EIO); | |
283 | } | |
284 | ||
285 | void ext3_warning (struct super_block * sb, const char * function, | |
286 | const char * fmt, ...) | |
287 | { | |
288 | va_list args; | |
289 | ||
290 | va_start(args, fmt); | |
291 | printk(KERN_WARNING "EXT3-fs warning (device %s): %s: ", | |
292 | sb->s_id, function); | |
293 | vprintk(fmt, args); | |
294 | printk("\n"); | |
295 | va_end(args); | |
296 | } | |
297 | ||
298 | void ext3_update_dynamic_rev(struct super_block *sb) | |
299 | { | |
300 | struct ext3_super_block *es = EXT3_SB(sb)->s_es; | |
301 | ||
302 | if (le32_to_cpu(es->s_rev_level) > EXT3_GOOD_OLD_REV) | |
303 | return; | |
304 | ||
305 | ext3_warning(sb, __FUNCTION__, | |
306 | "updating to rev %d because of new feature flag, " | |
307 | "running e2fsck is recommended", | |
308 | EXT3_DYNAMIC_REV); | |
309 | ||
310 | es->s_first_ino = cpu_to_le32(EXT3_GOOD_OLD_FIRST_INO); | |
311 | es->s_inode_size = cpu_to_le16(EXT3_GOOD_OLD_INODE_SIZE); | |
312 | es->s_rev_level = cpu_to_le32(EXT3_DYNAMIC_REV); | |
313 | /* leave es->s_feature_*compat flags alone */ | |
314 | /* es->s_uuid will be set by e2fsck if empty */ | |
315 | ||
316 | /* | |
317 | * The rest of the superblock fields should be zero, and if not it | |
318 | * means they are likely already in use, so leave them alone. We | |
319 | * can leave it up to e2fsck to clean up any inconsistencies there. | |
320 | */ | |
321 | } | |
322 | ||
323 | /* | |
324 | * Open the external journal device | |
325 | */ | |
326 | static struct block_device *ext3_blkdev_get(dev_t dev) | |
327 | { | |
328 | struct block_device *bdev; | |
329 | char b[BDEVNAME_SIZE]; | |
330 | ||
331 | bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE); | |
332 | if (IS_ERR(bdev)) | |
333 | goto fail; | |
334 | return bdev; | |
335 | ||
336 | fail: | |
337 | printk(KERN_ERR "EXT3: failed to open journal device %s: %ld\n", | |
338 | __bdevname(dev, b), PTR_ERR(bdev)); | |
339 | return NULL; | |
340 | } | |
341 | ||
342 | /* | |
343 | * Release the journal device | |
344 | */ | |
345 | static int ext3_blkdev_put(struct block_device *bdev) | |
346 | { | |
347 | bd_release(bdev); | |
348 | return blkdev_put(bdev); | |
349 | } | |
350 | ||
351 | static int ext3_blkdev_remove(struct ext3_sb_info *sbi) | |
352 | { | |
353 | struct block_device *bdev; | |
354 | int ret = -ENODEV; | |
355 | ||
356 | bdev = sbi->journal_bdev; | |
357 | if (bdev) { | |
358 | ret = ext3_blkdev_put(bdev); | |
359 | sbi->journal_bdev = NULL; | |
360 | } | |
361 | return ret; | |
362 | } | |
363 | ||
364 | static inline struct inode *orphan_list_entry(struct list_head *l) | |
365 | { | |
366 | return &list_entry(l, struct ext3_inode_info, i_orphan)->vfs_inode; | |
367 | } | |
368 | ||
369 | static void dump_orphan_list(struct super_block *sb, struct ext3_sb_info *sbi) | |
370 | { | |
371 | struct list_head *l; | |
372 | ||
ae6ddcc5 | 373 | printk(KERN_ERR "sb orphan head is %d\n", |
1da177e4 LT |
374 | le32_to_cpu(sbi->s_es->s_last_orphan)); |
375 | ||
376 | printk(KERN_ERR "sb_info orphan list:\n"); | |
377 | list_for_each(l, &sbi->s_orphan) { | |
378 | struct inode *inode = orphan_list_entry(l); | |
379 | printk(KERN_ERR " " | |
eee194e7 | 380 | "inode %s:%lu at %p: mode %o, nlink %d, next %d\n", |
1da177e4 | 381 | inode->i_sb->s_id, inode->i_ino, inode, |
ae6ddcc5 | 382 | inode->i_mode, inode->i_nlink, |
1da177e4 LT |
383 | NEXT_ORPHAN(inode)); |
384 | } | |
385 | } | |
386 | ||
387 | static void ext3_put_super (struct super_block * sb) | |
388 | { | |
389 | struct ext3_sb_info *sbi = EXT3_SB(sb); | |
390 | struct ext3_super_block *es = sbi->s_es; | |
391 | int i; | |
392 | ||
393 | ext3_xattr_put_super(sb); | |
394 | journal_destroy(sbi->s_journal); | |
395 | if (!(sb->s_flags & MS_RDONLY)) { | |
396 | EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER); | |
397 | es->s_state = cpu_to_le16(sbi->s_mount_state); | |
398 | BUFFER_TRACE(sbi->s_sbh, "marking dirty"); | |
399 | mark_buffer_dirty(sbi->s_sbh); | |
400 | ext3_commit_super(sb, es, 1); | |
401 | } | |
402 | ||
403 | for (i = 0; i < sbi->s_gdb_count; i++) | |
404 | brelse(sbi->s_group_desc[i]); | |
405 | kfree(sbi->s_group_desc); | |
406 | percpu_counter_destroy(&sbi->s_freeblocks_counter); | |
407 | percpu_counter_destroy(&sbi->s_freeinodes_counter); | |
408 | percpu_counter_destroy(&sbi->s_dirs_counter); | |
409 | brelse(sbi->s_sbh); | |
410 | #ifdef CONFIG_QUOTA | |
411 | for (i = 0; i < MAXQUOTAS; i++) | |
412 | kfree(sbi->s_qf_names[i]); | |
413 | #endif | |
414 | ||
415 | /* Debugging code just in case the in-memory inode orphan list | |
416 | * isn't empty. The on-disk one can be non-empty if we've | |
417 | * detected an error and taken the fs readonly, but the | |
418 | * in-memory list had better be clean by this point. */ | |
419 | if (!list_empty(&sbi->s_orphan)) | |
420 | dump_orphan_list(sb, sbi); | |
421 | J_ASSERT(list_empty(&sbi->s_orphan)); | |
422 | ||
423 | invalidate_bdev(sb->s_bdev, 0); | |
424 | if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) { | |
425 | /* | |
426 | * Invalidate the journal device's buffers. We don't want them | |
427 | * floating about in memory - the physical journal device may | |
428 | * hotswapped, and it breaks the `ro-after' testing code. | |
429 | */ | |
430 | sync_blockdev(sbi->journal_bdev); | |
431 | invalidate_bdev(sbi->journal_bdev, 0); | |
432 | ext3_blkdev_remove(sbi); | |
433 | } | |
434 | sb->s_fs_info = NULL; | |
435 | kfree(sbi); | |
436 | return; | |
437 | } | |
438 | ||
439 | static kmem_cache_t *ext3_inode_cachep; | |
440 | ||
441 | /* | |
442 | * Called inside transaction, so use GFP_NOFS | |
443 | */ | |
444 | static struct inode *ext3_alloc_inode(struct super_block *sb) | |
445 | { | |
446 | struct ext3_inode_info *ei; | |
447 | ||
448 | ei = kmem_cache_alloc(ext3_inode_cachep, SLAB_NOFS); | |
449 | if (!ei) | |
450 | return NULL; | |
451 | #ifdef CONFIG_EXT3_FS_POSIX_ACL | |
452 | ei->i_acl = EXT3_ACL_NOT_CACHED; | |
453 | ei->i_default_acl = EXT3_ACL_NOT_CACHED; | |
454 | #endif | |
455 | ei->i_block_alloc_info = NULL; | |
456 | ei->vfs_inode.i_version = 1; | |
457 | return &ei->vfs_inode; | |
458 | } | |
459 | ||
460 | static void ext3_destroy_inode(struct inode *inode) | |
461 | { | |
462 | kmem_cache_free(ext3_inode_cachep, EXT3_I(inode)); | |
463 | } | |
464 | ||
465 | static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags) | |
466 | { | |
467 | struct ext3_inode_info *ei = (struct ext3_inode_info *) foo; | |
468 | ||
469 | if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == | |
470 | SLAB_CTOR_CONSTRUCTOR) { | |
471 | INIT_LIST_HEAD(&ei->i_orphan); | |
472 | #ifdef CONFIG_EXT3_FS_XATTR | |
473 | init_rwsem(&ei->xattr_sem); | |
474 | #endif | |
97461518 | 475 | mutex_init(&ei->truncate_mutex); |
1da177e4 LT |
476 | inode_init_once(&ei->vfs_inode); |
477 | } | |
478 | } | |
ae6ddcc5 | 479 | |
1da177e4 LT |
480 | static int init_inodecache(void) |
481 | { | |
482 | ext3_inode_cachep = kmem_cache_create("ext3_inode_cache", | |
483 | sizeof(struct ext3_inode_info), | |
fffb60f9 PJ |
484 | 0, (SLAB_RECLAIM_ACCOUNT| |
485 | SLAB_MEM_SPREAD), | |
1da177e4 LT |
486 | init_once, NULL); |
487 | if (ext3_inode_cachep == NULL) | |
488 | return -ENOMEM; | |
489 | return 0; | |
490 | } | |
491 | ||
492 | static void destroy_inodecache(void) | |
493 | { | |
494 | if (kmem_cache_destroy(ext3_inode_cachep)) | |
495 | printk(KERN_INFO "ext3_inode_cache: not all structures were freed\n"); | |
496 | } | |
497 | ||
498 | static void ext3_clear_inode(struct inode *inode) | |
499 | { | |
500 | struct ext3_block_alloc_info *rsv = EXT3_I(inode)->i_block_alloc_info; | |
501 | #ifdef CONFIG_EXT3_FS_POSIX_ACL | |
e6022603 AM |
502 | if (EXT3_I(inode)->i_acl && |
503 | EXT3_I(inode)->i_acl != EXT3_ACL_NOT_CACHED) { | |
504 | posix_acl_release(EXT3_I(inode)->i_acl); | |
505 | EXT3_I(inode)->i_acl = EXT3_ACL_NOT_CACHED; | |
506 | } | |
507 | if (EXT3_I(inode)->i_default_acl && | |
508 | EXT3_I(inode)->i_default_acl != EXT3_ACL_NOT_CACHED) { | |
509 | posix_acl_release(EXT3_I(inode)->i_default_acl); | |
510 | EXT3_I(inode)->i_default_acl = EXT3_ACL_NOT_CACHED; | |
511 | } | |
1da177e4 LT |
512 | #endif |
513 | ext3_discard_reservation(inode); | |
514 | EXT3_I(inode)->i_block_alloc_info = NULL; | |
e6022603 AM |
515 | if (unlikely(rsv)) |
516 | kfree(rsv); | |
1da177e4 LT |
517 | } |
518 | ||
6cd37cda | 519 | static inline void ext3_show_quota_options(struct seq_file *seq, struct super_block *sb) |
8fc2751b | 520 | { |
6cd37cda | 521 | #if defined(CONFIG_QUOTA) |
275abf5b | 522 | struct ext3_sb_info *sbi = EXT3_SB(sb); |
8fc2751b | 523 | |
8fc2751b MB |
524 | if (sbi->s_jquota_fmt) |
525 | seq_printf(seq, ",jqfmt=%s", | |
526 | (sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold": "vfsv0"); | |
527 | ||
528 | if (sbi->s_qf_names[USRQUOTA]) | |
529 | seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]); | |
530 | ||
531 | if (sbi->s_qf_names[GRPQUOTA]) | |
532 | seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]); | |
533 | ||
534 | if (sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA) | |
535 | seq_puts(seq, ",usrquota"); | |
536 | ||
537 | if (sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA) | |
538 | seq_puts(seq, ",grpquota"); | |
539 | #endif | |
6cd37cda PO |
540 | } |
541 | ||
542 | static int ext3_show_options(struct seq_file *seq, struct vfsmount *vfs) | |
543 | { | |
544 | struct super_block *sb = vfs->mnt_sb; | |
545 | ||
546 | if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA) | |
547 | seq_puts(seq, ",data=journal"); | |
548 | else if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA) | |
549 | seq_puts(seq, ",data=ordered"); | |
550 | else if (test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA) | |
551 | seq_puts(seq, ",data=writeback"); | |
552 | ||
553 | ext3_show_quota_options(seq, sb); | |
8fc2751b MB |
554 | |
555 | return 0; | |
556 | } | |
1da177e4 | 557 | |
fdb36673 N |
558 | |
559 | static struct dentry *ext3_get_dentry(struct super_block *sb, void *vobjp) | |
560 | { | |
561 | __u32 *objp = vobjp; | |
562 | unsigned long ino = objp[0]; | |
563 | __u32 generation = objp[1]; | |
564 | struct inode *inode; | |
565 | struct dentry *result; | |
566 | ||
567 | if (ino < EXT3_FIRST_INO(sb) && ino != EXT3_ROOT_INO) | |
568 | return ERR_PTR(-ESTALE); | |
569 | if (ino > le32_to_cpu(EXT3_SB(sb)->s_es->s_inodes_count)) | |
570 | return ERR_PTR(-ESTALE); | |
571 | ||
572 | /* iget isn't really right if the inode is currently unallocated!! | |
573 | * | |
574 | * ext3_read_inode will return a bad_inode if the inode had been | |
575 | * deleted, so we should be safe. | |
576 | * | |
577 | * Currently we don't know the generation for parent directory, so | |
578 | * a generation of 0 means "accept any" | |
579 | */ | |
580 | inode = iget(sb, ino); | |
581 | if (inode == NULL) | |
582 | return ERR_PTR(-ENOMEM); | |
583 | if (is_bad_inode(inode) || | |
584 | (generation && inode->i_generation != generation)) { | |
585 | iput(inode); | |
586 | return ERR_PTR(-ESTALE); | |
587 | } | |
588 | /* now to find a dentry. | |
589 | * If possible, get a well-connected one | |
590 | */ | |
591 | result = d_alloc_anon(inode); | |
592 | if (!result) { | |
593 | iput(inode); | |
594 | return ERR_PTR(-ENOMEM); | |
595 | } | |
596 | return result; | |
597 | } | |
598 | ||
8fc2751b | 599 | #ifdef CONFIG_QUOTA |
1da177e4 LT |
600 | #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group") |
601 | #define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA)) | |
602 | ||
603 | static int ext3_dquot_initialize(struct inode *inode, int type); | |
604 | static int ext3_dquot_drop(struct inode *inode); | |
605 | static int ext3_write_dquot(struct dquot *dquot); | |
606 | static int ext3_acquire_dquot(struct dquot *dquot); | |
607 | static int ext3_release_dquot(struct dquot *dquot); | |
608 | static int ext3_mark_dquot_dirty(struct dquot *dquot); | |
609 | static int ext3_write_info(struct super_block *sb, int type); | |
610 | static int ext3_quota_on(struct super_block *sb, int type, int format_id, char *path); | |
611 | static int ext3_quota_on_mount(struct super_block *sb, int type); | |
612 | static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data, | |
613 | size_t len, loff_t off); | |
614 | static ssize_t ext3_quota_write(struct super_block *sb, int type, | |
615 | const char *data, size_t len, loff_t off); | |
616 | ||
617 | static struct dquot_operations ext3_quota_operations = { | |
618 | .initialize = ext3_dquot_initialize, | |
619 | .drop = ext3_dquot_drop, | |
620 | .alloc_space = dquot_alloc_space, | |
621 | .alloc_inode = dquot_alloc_inode, | |
622 | .free_space = dquot_free_space, | |
623 | .free_inode = dquot_free_inode, | |
624 | .transfer = dquot_transfer, | |
625 | .write_dquot = ext3_write_dquot, | |
626 | .acquire_dquot = ext3_acquire_dquot, | |
627 | .release_dquot = ext3_release_dquot, | |
628 | .mark_dirty = ext3_mark_dquot_dirty, | |
629 | .write_info = ext3_write_info | |
630 | }; | |
631 | ||
632 | static struct quotactl_ops ext3_qctl_operations = { | |
633 | .quota_on = ext3_quota_on, | |
634 | .quota_off = vfs_quota_off, | |
635 | .quota_sync = vfs_quota_sync, | |
636 | .get_info = vfs_get_dqinfo, | |
637 | .set_info = vfs_set_dqinfo, | |
638 | .get_dqblk = vfs_get_dqblk, | |
639 | .set_dqblk = vfs_set_dqblk | |
640 | }; | |
641 | #endif | |
642 | ||
643 | static struct super_operations ext3_sops = { | |
644 | .alloc_inode = ext3_alloc_inode, | |
645 | .destroy_inode = ext3_destroy_inode, | |
646 | .read_inode = ext3_read_inode, | |
647 | .write_inode = ext3_write_inode, | |
648 | .dirty_inode = ext3_dirty_inode, | |
649 | .delete_inode = ext3_delete_inode, | |
650 | .put_super = ext3_put_super, | |
651 | .write_super = ext3_write_super, | |
652 | .sync_fs = ext3_sync_fs, | |
653 | .write_super_lockfs = ext3_write_super_lockfs, | |
654 | .unlockfs = ext3_unlockfs, | |
655 | .statfs = ext3_statfs, | |
656 | .remount_fs = ext3_remount, | |
657 | .clear_inode = ext3_clear_inode, | |
8fc2751b | 658 | .show_options = ext3_show_options, |
1da177e4 LT |
659 | #ifdef CONFIG_QUOTA |
660 | .quota_read = ext3_quota_read, | |
661 | .quota_write = ext3_quota_write, | |
662 | #endif | |
663 | }; | |
664 | ||
1da177e4 LT |
665 | static struct export_operations ext3_export_ops = { |
666 | .get_parent = ext3_get_parent, | |
fdb36673 | 667 | .get_dentry = ext3_get_dentry, |
1da177e4 LT |
668 | }; |
669 | ||
670 | enum { | |
671 | Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid, | |
672 | Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro, | |
2860b733 | 673 | Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov, |
1da177e4 | 674 | Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl, |
ade1a29e | 675 | Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh, |
71b96257 | 676 | Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev, |
1da177e4 LT |
677 | Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback, |
678 | Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota, | |
1f54587b | 679 | Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota, |
8fc2751b MB |
680 | Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota, |
681 | Opt_grpquota | |
1da177e4 LT |
682 | }; |
683 | ||
684 | static match_table_t tokens = { | |
685 | {Opt_bsd_df, "bsddf"}, | |
686 | {Opt_minix_df, "minixdf"}, | |
687 | {Opt_grpid, "grpid"}, | |
688 | {Opt_grpid, "bsdgroups"}, | |
689 | {Opt_nogrpid, "nogrpid"}, | |
690 | {Opt_nogrpid, "sysvgroups"}, | |
691 | {Opt_resgid, "resgid=%u"}, | |
692 | {Opt_resuid, "resuid=%u"}, | |
693 | {Opt_sb, "sb=%u"}, | |
694 | {Opt_err_cont, "errors=continue"}, | |
695 | {Opt_err_panic, "errors=panic"}, | |
696 | {Opt_err_ro, "errors=remount-ro"}, | |
697 | {Opt_nouid32, "nouid32"}, | |
698 | {Opt_nocheck, "nocheck"}, | |
699 | {Opt_nocheck, "check=none"}, | |
1da177e4 LT |
700 | {Opt_debug, "debug"}, |
701 | {Opt_oldalloc, "oldalloc"}, | |
702 | {Opt_orlov, "orlov"}, | |
703 | {Opt_user_xattr, "user_xattr"}, | |
704 | {Opt_nouser_xattr, "nouser_xattr"}, | |
705 | {Opt_acl, "acl"}, | |
706 | {Opt_noacl, "noacl"}, | |
707 | {Opt_reservation, "reservation"}, | |
708 | {Opt_noreservation, "noreservation"}, | |
709 | {Opt_noload, "noload"}, | |
710 | {Opt_nobh, "nobh"}, | |
ade1a29e | 711 | {Opt_bh, "bh"}, |
1da177e4 LT |
712 | {Opt_commit, "commit=%u"}, |
713 | {Opt_journal_update, "journal=update"}, | |
714 | {Opt_journal_inum, "journal=%u"}, | |
71b96257 | 715 | {Opt_journal_dev, "journal_dev=%u"}, |
1da177e4 LT |
716 | {Opt_abort, "abort"}, |
717 | {Opt_data_journal, "data=journal"}, | |
718 | {Opt_data_ordered, "data=ordered"}, | |
719 | {Opt_data_writeback, "data=writeback"}, | |
720 | {Opt_offusrjquota, "usrjquota="}, | |
721 | {Opt_usrjquota, "usrjquota=%s"}, | |
722 | {Opt_offgrpjquota, "grpjquota="}, | |
723 | {Opt_grpjquota, "grpjquota=%s"}, | |
724 | {Opt_jqfmt_vfsold, "jqfmt=vfsold"}, | |
725 | {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"}, | |
8fc2751b | 726 | {Opt_grpquota, "grpquota"}, |
1f54587b JK |
727 | {Opt_noquota, "noquota"}, |
728 | {Opt_quota, "quota"}, | |
8fc2751b | 729 | {Opt_usrquota, "usrquota"}, |
1da177e4 LT |
730 | {Opt_barrier, "barrier=%u"}, |
731 | {Opt_err, NULL}, | |
732 | {Opt_resize, "resize"}, | |
733 | }; | |
734 | ||
43d23f90 | 735 | static ext3_fsblk_t get_sb_block(void **data) |
1da177e4 | 736 | { |
e9ad5620 DK |
737 | ext3_fsblk_t sb_block; |
738 | char *options = (char *) *data; | |
1da177e4 LT |
739 | |
740 | if (!options || strncmp(options, "sb=", 3) != 0) | |
741 | return 1; /* Default location */ | |
742 | options += 3; | |
43d23f90 | 743 | /*todo: use simple_strtoll with >32bit ext3 */ |
1da177e4 LT |
744 | sb_block = simple_strtoul(options, &options, 0); |
745 | if (*options && *options != ',') { | |
746 | printk("EXT3-fs: Invalid sb specification: %s\n", | |
747 | (char *) *data); | |
748 | return 1; | |
749 | } | |
750 | if (*options == ',') | |
751 | options++; | |
752 | *data = (void *) options; | |
753 | return sb_block; | |
754 | } | |
755 | ||
71b96257 | 756 | static int parse_options (char *options, struct super_block *sb, |
eee194e7 | 757 | unsigned int *inum, unsigned long *journal_devnum, |
43d23f90 | 758 | ext3_fsblk_t *n_blocks_count, int is_remount) |
1da177e4 LT |
759 | { |
760 | struct ext3_sb_info *sbi = EXT3_SB(sb); | |
761 | char * p; | |
762 | substring_t args[MAX_OPT_ARGS]; | |
763 | int data_opt = 0; | |
764 | int option; | |
765 | #ifdef CONFIG_QUOTA | |
766 | int qtype; | |
767 | char *qname; | |
768 | #endif | |
769 | ||
770 | if (!options) | |
771 | return 1; | |
772 | ||
773 | while ((p = strsep (&options, ",")) != NULL) { | |
774 | int token; | |
775 | if (!*p) | |
776 | continue; | |
777 | ||
778 | token = match_token(p, tokens, args); | |
779 | switch (token) { | |
780 | case Opt_bsd_df: | |
781 | clear_opt (sbi->s_mount_opt, MINIX_DF); | |
782 | break; | |
783 | case Opt_minix_df: | |
784 | set_opt (sbi->s_mount_opt, MINIX_DF); | |
785 | break; | |
786 | case Opt_grpid: | |
787 | set_opt (sbi->s_mount_opt, GRPID); | |
788 | break; | |
789 | case Opt_nogrpid: | |
790 | clear_opt (sbi->s_mount_opt, GRPID); | |
791 | break; | |
792 | case Opt_resuid: | |
793 | if (match_int(&args[0], &option)) | |
794 | return 0; | |
795 | sbi->s_resuid = option; | |
796 | break; | |
797 | case Opt_resgid: | |
798 | if (match_int(&args[0], &option)) | |
799 | return 0; | |
800 | sbi->s_resgid = option; | |
801 | break; | |
802 | case Opt_sb: | |
803 | /* handled by get_sb_block() instead of here */ | |
804 | /* *sb_block = match_int(&args[0]); */ | |
805 | break; | |
806 | case Opt_err_panic: | |
807 | clear_opt (sbi->s_mount_opt, ERRORS_CONT); | |
808 | clear_opt (sbi->s_mount_opt, ERRORS_RO); | |
809 | set_opt (sbi->s_mount_opt, ERRORS_PANIC); | |
810 | break; | |
811 | case Opt_err_ro: | |
812 | clear_opt (sbi->s_mount_opt, ERRORS_CONT); | |
813 | clear_opt (sbi->s_mount_opt, ERRORS_PANIC); | |
814 | set_opt (sbi->s_mount_opt, ERRORS_RO); | |
815 | break; | |
816 | case Opt_err_cont: | |
817 | clear_opt (sbi->s_mount_opt, ERRORS_RO); | |
818 | clear_opt (sbi->s_mount_opt, ERRORS_PANIC); | |
819 | set_opt (sbi->s_mount_opt, ERRORS_CONT); | |
820 | break; | |
821 | case Opt_nouid32: | |
822 | set_opt (sbi->s_mount_opt, NO_UID32); | |
823 | break; | |
1da177e4 LT |
824 | case Opt_nocheck: |
825 | clear_opt (sbi->s_mount_opt, CHECK); | |
826 | break; | |
827 | case Opt_debug: | |
828 | set_opt (sbi->s_mount_opt, DEBUG); | |
829 | break; | |
830 | case Opt_oldalloc: | |
831 | set_opt (sbi->s_mount_opt, OLDALLOC); | |
832 | break; | |
833 | case Opt_orlov: | |
834 | clear_opt (sbi->s_mount_opt, OLDALLOC); | |
835 | break; | |
836 | #ifdef CONFIG_EXT3_FS_XATTR | |
837 | case Opt_user_xattr: | |
838 | set_opt (sbi->s_mount_opt, XATTR_USER); | |
839 | break; | |
840 | case Opt_nouser_xattr: | |
841 | clear_opt (sbi->s_mount_opt, XATTR_USER); | |
842 | break; | |
843 | #else | |
844 | case Opt_user_xattr: | |
845 | case Opt_nouser_xattr: | |
846 | printk("EXT3 (no)user_xattr options not supported\n"); | |
847 | break; | |
848 | #endif | |
849 | #ifdef CONFIG_EXT3_FS_POSIX_ACL | |
850 | case Opt_acl: | |
851 | set_opt(sbi->s_mount_opt, POSIX_ACL); | |
852 | break; | |
853 | case Opt_noacl: | |
854 | clear_opt(sbi->s_mount_opt, POSIX_ACL); | |
855 | break; | |
856 | #else | |
857 | case Opt_acl: | |
858 | case Opt_noacl: | |
859 | printk("EXT3 (no)acl options not supported\n"); | |
860 | break; | |
861 | #endif | |
862 | case Opt_reservation: | |
863 | set_opt(sbi->s_mount_opt, RESERVATION); | |
864 | break; | |
865 | case Opt_noreservation: | |
866 | clear_opt(sbi->s_mount_opt, RESERVATION); | |
867 | break; | |
868 | case Opt_journal_update: | |
869 | /* @@@ FIXME */ | |
870 | /* Eventually we will want to be able to create | |
871 | a journal file here. For now, only allow the | |
872 | user to specify an existing inode to be the | |
873 | journal file. */ | |
874 | if (is_remount) { | |
875 | printk(KERN_ERR "EXT3-fs: cannot specify " | |
876 | "journal on remount\n"); | |
877 | return 0; | |
878 | } | |
879 | set_opt (sbi->s_mount_opt, UPDATE_JOURNAL); | |
880 | break; | |
881 | case Opt_journal_inum: | |
882 | if (is_remount) { | |
883 | printk(KERN_ERR "EXT3-fs: cannot specify " | |
884 | "journal on remount\n"); | |
885 | return 0; | |
886 | } | |
887 | if (match_int(&args[0], &option)) | |
888 | return 0; | |
889 | *inum = option; | |
890 | break; | |
71b96257 JL |
891 | case Opt_journal_dev: |
892 | if (is_remount) { | |
893 | printk(KERN_ERR "EXT3-fs: cannot specify " | |
894 | "journal on remount\n"); | |
895 | return 0; | |
896 | } | |
897 | if (match_int(&args[0], &option)) | |
898 | return 0; | |
899 | *journal_devnum = option; | |
900 | break; | |
1da177e4 LT |
901 | case Opt_noload: |
902 | set_opt (sbi->s_mount_opt, NOLOAD); | |
903 | break; | |
904 | case Opt_commit: | |
905 | if (match_int(&args[0], &option)) | |
906 | return 0; | |
907 | if (option < 0) | |
908 | return 0; | |
909 | if (option == 0) | |
910 | option = JBD_DEFAULT_MAX_COMMIT_AGE; | |
911 | sbi->s_commit_interval = HZ * option; | |
912 | break; | |
913 | case Opt_data_journal: | |
914 | data_opt = EXT3_MOUNT_JOURNAL_DATA; | |
915 | goto datacheck; | |
916 | case Opt_data_ordered: | |
917 | data_opt = EXT3_MOUNT_ORDERED_DATA; | |
918 | goto datacheck; | |
919 | case Opt_data_writeback: | |
920 | data_opt = EXT3_MOUNT_WRITEBACK_DATA; | |
921 | datacheck: | |
922 | if (is_remount) { | |
923 | if ((sbi->s_mount_opt & EXT3_MOUNT_DATA_FLAGS) | |
924 | != data_opt) { | |
925 | printk(KERN_ERR | |
926 | "EXT3-fs: cannot change data " | |
927 | "mode on remount\n"); | |
928 | return 0; | |
929 | } | |
930 | } else { | |
931 | sbi->s_mount_opt &= ~EXT3_MOUNT_DATA_FLAGS; | |
932 | sbi->s_mount_opt |= data_opt; | |
933 | } | |
934 | break; | |
935 | #ifdef CONFIG_QUOTA | |
936 | case Opt_usrjquota: | |
937 | qtype = USRQUOTA; | |
938 | goto set_qf_name; | |
939 | case Opt_grpjquota: | |
940 | qtype = GRPQUOTA; | |
941 | set_qf_name: | |
942 | if (sb_any_quota_enabled(sb)) { | |
943 | printk(KERN_ERR | |
944 | "EXT3-fs: Cannot change journalled " | |
945 | "quota options when quota turned on.\n"); | |
946 | return 0; | |
947 | } | |
948 | qname = match_strdup(&args[0]); | |
949 | if (!qname) { | |
950 | printk(KERN_ERR | |
951 | "EXT3-fs: not enough memory for " | |
952 | "storing quotafile name.\n"); | |
953 | return 0; | |
954 | } | |
955 | if (sbi->s_qf_names[qtype] && | |
956 | strcmp(sbi->s_qf_names[qtype], qname)) { | |
957 | printk(KERN_ERR | |
958 | "EXT3-fs: %s quota file already " | |
959 | "specified.\n", QTYPE2NAME(qtype)); | |
960 | kfree(qname); | |
961 | return 0; | |
962 | } | |
963 | sbi->s_qf_names[qtype] = qname; | |
964 | if (strchr(sbi->s_qf_names[qtype], '/')) { | |
965 | printk(KERN_ERR | |
966 | "EXT3-fs: quotafile must be on " | |
967 | "filesystem root.\n"); | |
968 | kfree(sbi->s_qf_names[qtype]); | |
969 | sbi->s_qf_names[qtype] = NULL; | |
970 | return 0; | |
971 | } | |
1f54587b | 972 | set_opt(sbi->s_mount_opt, QUOTA); |
1da177e4 LT |
973 | break; |
974 | case Opt_offusrjquota: | |
975 | qtype = USRQUOTA; | |
976 | goto clear_qf_name; | |
977 | case Opt_offgrpjquota: | |
978 | qtype = GRPQUOTA; | |
979 | clear_qf_name: | |
980 | if (sb_any_quota_enabled(sb)) { | |
981 | printk(KERN_ERR "EXT3-fs: Cannot change " | |
982 | "journalled quota options when " | |
983 | "quota turned on.\n"); | |
984 | return 0; | |
985 | } | |
08c6a96f JK |
986 | /* |
987 | * The space will be released later when all options | |
988 | * are confirmed to be correct | |
989 | */ | |
1da177e4 LT |
990 | sbi->s_qf_names[qtype] = NULL; |
991 | break; | |
992 | case Opt_jqfmt_vfsold: | |
993 | sbi->s_jquota_fmt = QFMT_VFS_OLD; | |
994 | break; | |
995 | case Opt_jqfmt_vfsv0: | |
996 | sbi->s_jquota_fmt = QFMT_VFS_V0; | |
997 | break; | |
1f54587b | 998 | case Opt_quota: |
8fc2751b MB |
999 | case Opt_usrquota: |
1000 | set_opt(sbi->s_mount_opt, QUOTA); | |
1001 | set_opt(sbi->s_mount_opt, USRQUOTA); | |
1002 | break; | |
1003 | case Opt_grpquota: | |
1f54587b | 1004 | set_opt(sbi->s_mount_opt, QUOTA); |
8fc2751b | 1005 | set_opt(sbi->s_mount_opt, GRPQUOTA); |
1f54587b JK |
1006 | break; |
1007 | case Opt_noquota: | |
1008 | if (sb_any_quota_enabled(sb)) { | |
1009 | printk(KERN_ERR "EXT3-fs: Cannot change quota " | |
1010 | "options when quota turned on.\n"); | |
1011 | return 0; | |
1012 | } | |
1013 | clear_opt(sbi->s_mount_opt, QUOTA); | |
8fc2751b MB |
1014 | clear_opt(sbi->s_mount_opt, USRQUOTA); |
1015 | clear_opt(sbi->s_mount_opt, GRPQUOTA); | |
1f54587b | 1016 | break; |
1da177e4 | 1017 | #else |
8fc2751b MB |
1018 | case Opt_quota: |
1019 | case Opt_usrquota: | |
1020 | case Opt_grpquota: | |
1da177e4 LT |
1021 | case Opt_usrjquota: |
1022 | case Opt_grpjquota: | |
1023 | case Opt_offusrjquota: | |
1024 | case Opt_offgrpjquota: | |
1025 | case Opt_jqfmt_vfsold: | |
1026 | case Opt_jqfmt_vfsv0: | |
1027 | printk(KERN_ERR | |
1028 | "EXT3-fs: journalled quota options not " | |
1029 | "supported.\n"); | |
1030 | break; | |
1f54587b JK |
1031 | case Opt_noquota: |
1032 | break; | |
1da177e4 LT |
1033 | #endif |
1034 | case Opt_abort: | |
1035 | set_opt(sbi->s_mount_opt, ABORT); | |
1036 | break; | |
1037 | case Opt_barrier: | |
1038 | if (match_int(&args[0], &option)) | |
1039 | return 0; | |
1040 | if (option) | |
1041 | set_opt(sbi->s_mount_opt, BARRIER); | |
1042 | else | |
1043 | clear_opt(sbi->s_mount_opt, BARRIER); | |
1044 | break; | |
1045 | case Opt_ignore: | |
1046 | break; | |
1047 | case Opt_resize: | |
08c6a96f | 1048 | if (!is_remount) { |
1da177e4 LT |
1049 | printk("EXT3-fs: resize option only available " |
1050 | "for remount\n"); | |
1051 | return 0; | |
1052 | } | |
c7f1721e KZ |
1053 | if (match_int(&args[0], &option) != 0) |
1054 | return 0; | |
1da177e4 LT |
1055 | *n_blocks_count = option; |
1056 | break; | |
1057 | case Opt_nobh: | |
1058 | set_opt(sbi->s_mount_opt, NOBH); | |
1059 | break; | |
ade1a29e BP |
1060 | case Opt_bh: |
1061 | clear_opt(sbi->s_mount_opt, NOBH); | |
1062 | break; | |
1da177e4 LT |
1063 | default: |
1064 | printk (KERN_ERR | |
1065 | "EXT3-fs: Unrecognized mount option \"%s\" " | |
1066 | "or missing value\n", p); | |
1067 | return 0; | |
1068 | } | |
1069 | } | |
1070 | #ifdef CONFIG_QUOTA | |
8fc2751b MB |
1071 | if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) { |
1072 | if ((sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA) && | |
1073 | sbi->s_qf_names[USRQUOTA]) | |
1074 | clear_opt(sbi->s_mount_opt, USRQUOTA); | |
1075 | ||
1076 | if ((sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA) && | |
1077 | sbi->s_qf_names[GRPQUOTA]) | |
1078 | clear_opt(sbi->s_mount_opt, GRPQUOTA); | |
1079 | ||
1080 | if ((sbi->s_qf_names[USRQUOTA] && | |
1081 | (sbi->s_mount_opt & EXT3_MOUNT_GRPQUOTA)) || | |
1082 | (sbi->s_qf_names[GRPQUOTA] && | |
1083 | (sbi->s_mount_opt & EXT3_MOUNT_USRQUOTA))) { | |
1084 | printk(KERN_ERR "EXT3-fs: old and new quota " | |
1085 | "format mixing.\n"); | |
1086 | return 0; | |
1087 | } | |
1088 | ||
1089 | if (!sbi->s_jquota_fmt) { | |
1090 | printk(KERN_ERR "EXT3-fs: journalled quota format " | |
1091 | "not specified.\n"); | |
1092 | return 0; | |
1093 | } | |
1094 | } else { | |
1095 | if (sbi->s_jquota_fmt) { | |
1096 | printk(KERN_ERR "EXT3-fs: journalled quota format " | |
1097 | "specified with no journalling " | |
1098 | "enabled.\n"); | |
1099 | return 0; | |
1100 | } | |
1da177e4 LT |
1101 | } |
1102 | #endif | |
1da177e4 LT |
1103 | return 1; |
1104 | } | |
1105 | ||
1106 | static int ext3_setup_super(struct super_block *sb, struct ext3_super_block *es, | |
1107 | int read_only) | |
1108 | { | |
1109 | struct ext3_sb_info *sbi = EXT3_SB(sb); | |
1110 | int res = 0; | |
1111 | ||
1112 | if (le32_to_cpu(es->s_rev_level) > EXT3_MAX_SUPP_REV) { | |
1113 | printk (KERN_ERR "EXT3-fs warning: revision level too high, " | |
1114 | "forcing read-only mode\n"); | |
1115 | res = MS_RDONLY; | |
1116 | } | |
1117 | if (read_only) | |
1118 | return res; | |
1119 | if (!(sbi->s_mount_state & EXT3_VALID_FS)) | |
1120 | printk (KERN_WARNING "EXT3-fs warning: mounting unchecked fs, " | |
1121 | "running e2fsck is recommended\n"); | |
1122 | else if ((sbi->s_mount_state & EXT3_ERROR_FS)) | |
1123 | printk (KERN_WARNING | |
1124 | "EXT3-fs warning: mounting fs with errors, " | |
1125 | "running e2fsck is recommended\n"); | |
1126 | else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 && | |
1127 | le16_to_cpu(es->s_mnt_count) >= | |
1128 | (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count)) | |
1129 | printk (KERN_WARNING | |
1130 | "EXT3-fs warning: maximal mount count reached, " | |
1131 | "running e2fsck is recommended\n"); | |
1132 | else if (le32_to_cpu(es->s_checkinterval) && | |
1133 | (le32_to_cpu(es->s_lastcheck) + | |
1134 | le32_to_cpu(es->s_checkinterval) <= get_seconds())) | |
1135 | printk (KERN_WARNING | |
1136 | "EXT3-fs warning: checktime reached, " | |
1137 | "running e2fsck is recommended\n"); | |
1138 | #if 0 | |
1139 | /* @@@ We _will_ want to clear the valid bit if we find | |
1140 | inconsistencies, to force a fsck at reboot. But for | |
1141 | a plain journaled filesystem we can keep it set as | |
1142 | valid forever! :) */ | |
1143 | es->s_state = cpu_to_le16(le16_to_cpu(es->s_state) & ~EXT3_VALID_FS); | |
1144 | #endif | |
1145 | if (!(__s16) le16_to_cpu(es->s_max_mnt_count)) | |
1146 | es->s_max_mnt_count = cpu_to_le16(EXT3_DFL_MAX_MNT_COUNT); | |
1147 | es->s_mnt_count=cpu_to_le16(le16_to_cpu(es->s_mnt_count) + 1); | |
1148 | es->s_mtime = cpu_to_le32(get_seconds()); | |
1149 | ext3_update_dynamic_rev(sb); | |
1150 | EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER); | |
1151 | ||
1152 | ext3_commit_super(sb, es, 1); | |
1153 | if (test_opt(sb, DEBUG)) | |
1154 | printk(KERN_INFO "[EXT3 FS bs=%lu, gc=%lu, " | |
1155 | "bpg=%lu, ipg=%lu, mo=%04lx]\n", | |
1156 | sb->s_blocksize, | |
1157 | sbi->s_groups_count, | |
1158 | EXT3_BLOCKS_PER_GROUP(sb), | |
1159 | EXT3_INODES_PER_GROUP(sb), | |
1160 | sbi->s_mount_opt); | |
1161 | ||
1162 | printk(KERN_INFO "EXT3 FS on %s, ", sb->s_id); | |
1163 | if (EXT3_SB(sb)->s_journal->j_inode == NULL) { | |
1164 | char b[BDEVNAME_SIZE]; | |
1165 | ||
1166 | printk("external journal on %s\n", | |
1167 | bdevname(EXT3_SB(sb)->s_journal->j_dev, b)); | |
1168 | } else { | |
1169 | printk("internal journal\n"); | |
1170 | } | |
1da177e4 LT |
1171 | return res; |
1172 | } | |
1173 | ||
1174 | /* Called at mount-time, super-block is locked */ | |
1175 | static int ext3_check_descriptors (struct super_block * sb) | |
1176 | { | |
1177 | struct ext3_sb_info *sbi = EXT3_SB(sb); | |
855565e8 ES |
1178 | ext3_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block); |
1179 | ext3_fsblk_t last_block; | |
1da177e4 LT |
1180 | struct ext3_group_desc * gdp = NULL; |
1181 | int desc_block = 0; | |
1182 | int i; | |
1183 | ||
1184 | ext3_debug ("Checking group descriptors"); | |
1185 | ||
1186 | for (i = 0; i < sbi->s_groups_count; i++) | |
1187 | { | |
855565e8 ES |
1188 | if (i == sbi->s_groups_count - 1) |
1189 | last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1; | |
1190 | else | |
1191 | last_block = first_block + | |
1192 | (EXT3_BLOCKS_PER_GROUP(sb) - 1); | |
1193 | ||
1da177e4 LT |
1194 | if ((i % EXT3_DESC_PER_BLOCK(sb)) == 0) |
1195 | gdp = (struct ext3_group_desc *) | |
1196 | sbi->s_group_desc[desc_block++]->b_data; | |
855565e8 ES |
1197 | if (le32_to_cpu(gdp->bg_block_bitmap) < first_block || |
1198 | le32_to_cpu(gdp->bg_block_bitmap) > last_block) | |
1da177e4 LT |
1199 | { |
1200 | ext3_error (sb, "ext3_check_descriptors", | |
1201 | "Block bitmap for group %d" | |
1202 | " not in group (block %lu)!", | |
1203 | i, (unsigned long) | |
1204 | le32_to_cpu(gdp->bg_block_bitmap)); | |
1205 | return 0; | |
1206 | } | |
855565e8 ES |
1207 | if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block || |
1208 | le32_to_cpu(gdp->bg_inode_bitmap) > last_block) | |
1da177e4 LT |
1209 | { |
1210 | ext3_error (sb, "ext3_check_descriptors", | |
1211 | "Inode bitmap for group %d" | |
1212 | " not in group (block %lu)!", | |
1213 | i, (unsigned long) | |
1214 | le32_to_cpu(gdp->bg_inode_bitmap)); | |
1215 | return 0; | |
1216 | } | |
855565e8 ES |
1217 | if (le32_to_cpu(gdp->bg_inode_table) < first_block || |
1218 | le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group > | |
1219 | last_block) | |
1da177e4 LT |
1220 | { |
1221 | ext3_error (sb, "ext3_check_descriptors", | |
1222 | "Inode table for group %d" | |
1223 | " not in group (block %lu)!", | |
1224 | i, (unsigned long) | |
1225 | le32_to_cpu(gdp->bg_inode_table)); | |
1226 | return 0; | |
1227 | } | |
855565e8 | 1228 | first_block += EXT3_BLOCKS_PER_GROUP(sb); |
1da177e4 LT |
1229 | gdp++; |
1230 | } | |
1231 | ||
1232 | sbi->s_es->s_free_blocks_count=cpu_to_le32(ext3_count_free_blocks(sb)); | |
1233 | sbi->s_es->s_free_inodes_count=cpu_to_le32(ext3_count_free_inodes(sb)); | |
1234 | return 1; | |
1235 | } | |
1236 | ||
1237 | ||
1238 | /* ext3_orphan_cleanup() walks a singly-linked list of inodes (starting at | |
1239 | * the superblock) which were deleted from all directories, but held open by | |
1240 | * a process at the time of a crash. We walk the list and try to delete these | |
1241 | * inodes at recovery time (only with a read-write filesystem). | |
1242 | * | |
1243 | * In order to keep the orphan inode chain consistent during traversal (in | |
1244 | * case of crash during recovery), we link each inode into the superblock | |
1245 | * orphan list_head and handle it the same way as an inode deletion during | |
1246 | * normal operation (which journals the operations for us). | |
1247 | * | |
1248 | * We only do an iget() and an iput() on each inode, which is very safe if we | |
1249 | * accidentally point at an in-use or already deleted inode. The worst that | |
1250 | * can happen in this case is that we get a "bit already cleared" message from | |
1251 | * ext3_free_inode(). The only reason we would point at a wrong inode is if | |
1252 | * e2fsck was run on this filesystem, and it must have already done the orphan | |
1253 | * inode cleanup for us, so we can safely abort without any further action. | |
1254 | */ | |
1255 | static void ext3_orphan_cleanup (struct super_block * sb, | |
1256 | struct ext3_super_block * es) | |
1257 | { | |
1258 | unsigned int s_flags = sb->s_flags; | |
1259 | int nr_orphans = 0, nr_truncates = 0; | |
1260 | #ifdef CONFIG_QUOTA | |
1261 | int i; | |
1262 | #endif | |
1263 | if (!es->s_last_orphan) { | |
1264 | jbd_debug(4, "no orphan inodes to clean up\n"); | |
1265 | return; | |
1266 | } | |
1267 | ||
1268 | if (EXT3_SB(sb)->s_mount_state & EXT3_ERROR_FS) { | |
1269 | if (es->s_last_orphan) | |
1270 | jbd_debug(1, "Errors on filesystem, " | |
1271 | "clearing orphan list.\n"); | |
1272 | es->s_last_orphan = 0; | |
1273 | jbd_debug(1, "Skipping orphan recovery on fs with errors.\n"); | |
1274 | return; | |
1275 | } | |
1276 | ||
1277 | if (s_flags & MS_RDONLY) { | |
1278 | printk(KERN_INFO "EXT3-fs: %s: orphan cleanup on readonly fs\n", | |
1279 | sb->s_id); | |
1280 | sb->s_flags &= ~MS_RDONLY; | |
1281 | } | |
1282 | #ifdef CONFIG_QUOTA | |
1283 | /* Needed for iput() to work correctly and not trash data */ | |
1284 | sb->s_flags |= MS_ACTIVE; | |
1285 | /* Turn on quotas so that they are updated correctly */ | |
1286 | for (i = 0; i < MAXQUOTAS; i++) { | |
1287 | if (EXT3_SB(sb)->s_qf_names[i]) { | |
1288 | int ret = ext3_quota_on_mount(sb, i); | |
1289 | if (ret < 0) | |
1290 | printk(KERN_ERR | |
1291 | "EXT3-fs: Cannot turn on journalled " | |
1292 | "quota: error %d\n", ret); | |
1293 | } | |
1294 | } | |
1295 | #endif | |
1296 | ||
1297 | while (es->s_last_orphan) { | |
1298 | struct inode *inode; | |
1299 | ||
1300 | if (!(inode = | |
1301 | ext3_orphan_get(sb, le32_to_cpu(es->s_last_orphan)))) { | |
1302 | es->s_last_orphan = 0; | |
1303 | break; | |
1304 | } | |
1305 | ||
1306 | list_add(&EXT3_I(inode)->i_orphan, &EXT3_SB(sb)->s_orphan); | |
1307 | DQUOT_INIT(inode); | |
1308 | if (inode->i_nlink) { | |
1309 | printk(KERN_DEBUG | |
eee194e7 | 1310 | "%s: truncating inode %lu to %Ld bytes\n", |
1da177e4 | 1311 | __FUNCTION__, inode->i_ino, inode->i_size); |
eee194e7 | 1312 | jbd_debug(2, "truncating inode %lu to %Ld bytes\n", |
1da177e4 LT |
1313 | inode->i_ino, inode->i_size); |
1314 | ext3_truncate(inode); | |
1315 | nr_truncates++; | |
1316 | } else { | |
1317 | printk(KERN_DEBUG | |
eee194e7 | 1318 | "%s: deleting unreferenced inode %lu\n", |
1da177e4 | 1319 | __FUNCTION__, inode->i_ino); |
eee194e7 | 1320 | jbd_debug(2, "deleting unreferenced inode %lu\n", |
1da177e4 LT |
1321 | inode->i_ino); |
1322 | nr_orphans++; | |
1323 | } | |
1324 | iput(inode); /* The delete magic happens here! */ | |
1325 | } | |
1326 | ||
1327 | #define PLURAL(x) (x), ((x)==1) ? "" : "s" | |
1328 | ||
1329 | if (nr_orphans) | |
1330 | printk(KERN_INFO "EXT3-fs: %s: %d orphan inode%s deleted\n", | |
1331 | sb->s_id, PLURAL(nr_orphans)); | |
1332 | if (nr_truncates) | |
1333 | printk(KERN_INFO "EXT3-fs: %s: %d truncate%s cleaned up\n", | |
1334 | sb->s_id, PLURAL(nr_truncates)); | |
1335 | #ifdef CONFIG_QUOTA | |
1336 | /* Turn quotas off */ | |
1337 | for (i = 0; i < MAXQUOTAS; i++) { | |
1338 | if (sb_dqopt(sb)->files[i]) | |
1339 | vfs_quota_off(sb, i); | |
1340 | } | |
1341 | #endif | |
1342 | sb->s_flags = s_flags; /* Restore MS_RDONLY status */ | |
1343 | } | |
1344 | ||
1345 | #define log2(n) ffz(~(n)) | |
1346 | ||
1347 | /* | |
1348 | * Maximal file size. There is a direct, and {,double-,triple-}indirect | |
1349 | * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks. | |
1350 | * We need to be 1 filesystem block less than the 2^32 sector limit. | |
1351 | */ | |
1352 | static loff_t ext3_max_size(int bits) | |
1353 | { | |
1354 | loff_t res = EXT3_NDIR_BLOCKS; | |
1355 | /* This constant is calculated to be the largest file size for a | |
1356 | * dense, 4k-blocksize file such that the total number of | |
1357 | * sectors in the file, including data and all indirect blocks, | |
1358 | * does not exceed 2^32. */ | |
1359 | const loff_t upper_limit = 0x1ff7fffd000LL; | |
1360 | ||
1361 | res += 1LL << (bits-2); | |
1362 | res += 1LL << (2*(bits-2)); | |
1363 | res += 1LL << (3*(bits-2)); | |
1364 | res <<= bits; | |
1365 | if (res > upper_limit) | |
1366 | res = upper_limit; | |
1367 | return res; | |
1368 | } | |
1369 | ||
43d23f90 MC |
1370 | static ext3_fsblk_t descriptor_loc(struct super_block *sb, |
1371 | ext3_fsblk_t logic_sb_block, | |
1da177e4 LT |
1372 | int nr) |
1373 | { | |
1374 | struct ext3_sb_info *sbi = EXT3_SB(sb); | |
43d23f90 | 1375 | unsigned long bg, first_meta_bg; |
1da177e4 LT |
1376 | int has_super = 0; |
1377 | ||
1da177e4 LT |
1378 | first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg); |
1379 | ||
1380 | if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_META_BG) || | |
1381 | nr < first_meta_bg) | |
1382 | return (logic_sb_block + nr + 1); | |
1383 | bg = sbi->s_desc_per_block * nr; | |
1384 | if (ext3_bg_has_super(sb, bg)) | |
1385 | has_super = 1; | |
43d23f90 | 1386 | return (has_super + ext3_group_first_block_no(sb, bg)); |
1da177e4 LT |
1387 | } |
1388 | ||
1389 | ||
1390 | static int ext3_fill_super (struct super_block *sb, void *data, int silent) | |
1391 | { | |
1392 | struct buffer_head * bh; | |
1393 | struct ext3_super_block *es = NULL; | |
1394 | struct ext3_sb_info *sbi; | |
43d23f90 MC |
1395 | ext3_fsblk_t block; |
1396 | ext3_fsblk_t sb_block = get_sb_block(&data); | |
1397 | ext3_fsblk_t logic_sb_block; | |
1da177e4 | 1398 | unsigned long offset = 0; |
eee194e7 | 1399 | unsigned int journal_inum = 0; |
71b96257 | 1400 | unsigned long journal_devnum = 0; |
1da177e4 LT |
1401 | unsigned long def_mount_opts; |
1402 | struct inode *root; | |
1403 | int blocksize; | |
1404 | int hblock; | |
1405 | int db_count; | |
1406 | int i; | |
1407 | int needs_recovery; | |
1408 | __le32 features; | |
1409 | ||
1410 | sbi = kmalloc(sizeof(*sbi), GFP_KERNEL); | |
1411 | if (!sbi) | |
1412 | return -ENOMEM; | |
1413 | sb->s_fs_info = sbi; | |
1414 | memset(sbi, 0, sizeof(*sbi)); | |
1415 | sbi->s_mount_opt = 0; | |
1416 | sbi->s_resuid = EXT3_DEF_RESUID; | |
1417 | sbi->s_resgid = EXT3_DEF_RESGID; | |
1418 | ||
1419 | unlock_kernel(); | |
1420 | ||
1421 | blocksize = sb_min_blocksize(sb, EXT3_MIN_BLOCK_SIZE); | |
1422 | if (!blocksize) { | |
1423 | printk(KERN_ERR "EXT3-fs: unable to set blocksize\n"); | |
1424 | goto out_fail; | |
1425 | } | |
1426 | ||
1427 | /* | |
1428 | * The ext3 superblock will not be buffer aligned for other than 1kB | |
1429 | * block sizes. We need to calculate the offset from buffer start. | |
1430 | */ | |
1431 | if (blocksize != EXT3_MIN_BLOCK_SIZE) { | |
1432 | logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize; | |
1433 | offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize; | |
1434 | } else { | |
1435 | logic_sb_block = sb_block; | |
1436 | } | |
1437 | ||
1438 | if (!(bh = sb_bread(sb, logic_sb_block))) { | |
1439 | printk (KERN_ERR "EXT3-fs: unable to read superblock\n"); | |
1440 | goto out_fail; | |
1441 | } | |
1442 | /* | |
1443 | * Note: s_es must be initialized as soon as possible because | |
1444 | * some ext3 macro-instructions depend on its value | |
1445 | */ | |
1446 | es = (struct ext3_super_block *) (((char *)bh->b_data) + offset); | |
1447 | sbi->s_es = es; | |
1448 | sb->s_magic = le16_to_cpu(es->s_magic); | |
1449 | if (sb->s_magic != EXT3_SUPER_MAGIC) | |
1450 | goto cantfind_ext3; | |
1451 | ||
1452 | /* Set defaults before we parse the mount options */ | |
1453 | def_mount_opts = le32_to_cpu(es->s_default_mount_opts); | |
1454 | if (def_mount_opts & EXT3_DEFM_DEBUG) | |
1455 | set_opt(sbi->s_mount_opt, DEBUG); | |
1456 | if (def_mount_opts & EXT3_DEFM_BSDGROUPS) | |
1457 | set_opt(sbi->s_mount_opt, GRPID); | |
1458 | if (def_mount_opts & EXT3_DEFM_UID16) | |
1459 | set_opt(sbi->s_mount_opt, NO_UID32); | |
1460 | if (def_mount_opts & EXT3_DEFM_XATTR_USER) | |
1461 | set_opt(sbi->s_mount_opt, XATTR_USER); | |
1462 | if (def_mount_opts & EXT3_DEFM_ACL) | |
1463 | set_opt(sbi->s_mount_opt, POSIX_ACL); | |
1464 | if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_DATA) | |
1465 | sbi->s_mount_opt |= EXT3_MOUNT_JOURNAL_DATA; | |
1466 | else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_ORDERED) | |
1467 | sbi->s_mount_opt |= EXT3_MOUNT_ORDERED_DATA; | |
1468 | else if ((def_mount_opts & EXT3_DEFM_JMODE) == EXT3_DEFM_JMODE_WBACK) | |
1469 | sbi->s_mount_opt |= EXT3_MOUNT_WRITEBACK_DATA; | |
1470 | ||
1471 | if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_PANIC) | |
1472 | set_opt(sbi->s_mount_opt, ERRORS_PANIC); | |
1473 | else if (le16_to_cpu(sbi->s_es->s_errors) == EXT3_ERRORS_RO) | |
1474 | set_opt(sbi->s_mount_opt, ERRORS_RO); | |
1475 | ||
1476 | sbi->s_resuid = le16_to_cpu(es->s_def_resuid); | |
1477 | sbi->s_resgid = le16_to_cpu(es->s_def_resgid); | |
1478 | ||
1479 | set_opt(sbi->s_mount_opt, RESERVATION); | |
1480 | ||
71b96257 JL |
1481 | if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum, |
1482 | NULL, 0)) | |
1da177e4 LT |
1483 | goto failed_mount; |
1484 | ||
1485 | sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | | |
1486 | ((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0); | |
1487 | ||
1488 | if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV && | |
1489 | (EXT3_HAS_COMPAT_FEATURE(sb, ~0U) || | |
1490 | EXT3_HAS_RO_COMPAT_FEATURE(sb, ~0U) || | |
1491 | EXT3_HAS_INCOMPAT_FEATURE(sb, ~0U))) | |
ae6ddcc5 | 1492 | printk(KERN_WARNING |
1da177e4 LT |
1493 | "EXT3-fs warning: feature flags set on rev 0 fs, " |
1494 | "running e2fsck is recommended\n"); | |
1495 | /* | |
1496 | * Check feature flags regardless of the revision level, since we | |
1497 | * previously didn't change the revision level when setting the flags, | |
1498 | * so there is a chance incompat flags are set on a rev 0 filesystem. | |
1499 | */ | |
1500 | features = EXT3_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP); | |
1501 | if (features) { | |
1502 | printk(KERN_ERR "EXT3-fs: %s: couldn't mount because of " | |
1503 | "unsupported optional features (%x).\n", | |
1504 | sb->s_id, le32_to_cpu(features)); | |
1505 | goto failed_mount; | |
1506 | } | |
1507 | features = EXT3_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP); | |
1508 | if (!(sb->s_flags & MS_RDONLY) && features) { | |
1509 | printk(KERN_ERR "EXT3-fs: %s: couldn't mount RDWR because of " | |
1510 | "unsupported optional features (%x).\n", | |
1511 | sb->s_id, le32_to_cpu(features)); | |
1512 | goto failed_mount; | |
1513 | } | |
1514 | blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size); | |
1515 | ||
1516 | if (blocksize < EXT3_MIN_BLOCK_SIZE || | |
1517 | blocksize > EXT3_MAX_BLOCK_SIZE) { | |
ae6ddcc5 | 1518 | printk(KERN_ERR |
1da177e4 LT |
1519 | "EXT3-fs: Unsupported filesystem blocksize %d on %s.\n", |
1520 | blocksize, sb->s_id); | |
1521 | goto failed_mount; | |
1522 | } | |
1523 | ||
1524 | hblock = bdev_hardsect_size(sb->s_bdev); | |
1525 | if (sb->s_blocksize != blocksize) { | |
1526 | /* | |
1527 | * Make sure the blocksize for the filesystem is larger | |
1528 | * than the hardware sectorsize for the machine. | |
1529 | */ | |
1530 | if (blocksize < hblock) { | |
1531 | printk(KERN_ERR "EXT3-fs: blocksize %d too small for " | |
1532 | "device blocksize %d.\n", blocksize, hblock); | |
1533 | goto failed_mount; | |
1534 | } | |
1535 | ||
1536 | brelse (bh); | |
1537 | sb_set_blocksize(sb, blocksize); | |
1538 | logic_sb_block = (sb_block * EXT3_MIN_BLOCK_SIZE) / blocksize; | |
1539 | offset = (sb_block * EXT3_MIN_BLOCK_SIZE) % blocksize; | |
1540 | bh = sb_bread(sb, logic_sb_block); | |
1541 | if (!bh) { | |
ae6ddcc5 | 1542 | printk(KERN_ERR |
1da177e4 LT |
1543 | "EXT3-fs: Can't read superblock on 2nd try.\n"); |
1544 | goto failed_mount; | |
1545 | } | |
1546 | es = (struct ext3_super_block *)(((char *)bh->b_data) + offset); | |
1547 | sbi->s_es = es; | |
1548 | if (es->s_magic != cpu_to_le16(EXT3_SUPER_MAGIC)) { | |
ae6ddcc5 | 1549 | printk (KERN_ERR |
1da177e4 LT |
1550 | "EXT3-fs: Magic mismatch, very weird !\n"); |
1551 | goto failed_mount; | |
1552 | } | |
1553 | } | |
1554 | ||
1555 | sb->s_maxbytes = ext3_max_size(sb->s_blocksize_bits); | |
1556 | ||
1557 | if (le32_to_cpu(es->s_rev_level) == EXT3_GOOD_OLD_REV) { | |
1558 | sbi->s_inode_size = EXT3_GOOD_OLD_INODE_SIZE; | |
1559 | sbi->s_first_ino = EXT3_GOOD_OLD_FIRST_INO; | |
1560 | } else { | |
1561 | sbi->s_inode_size = le16_to_cpu(es->s_inode_size); | |
1562 | sbi->s_first_ino = le32_to_cpu(es->s_first_ino); | |
1563 | if ((sbi->s_inode_size < EXT3_GOOD_OLD_INODE_SIZE) || | |
1564 | (sbi->s_inode_size & (sbi->s_inode_size - 1)) || | |
1565 | (sbi->s_inode_size > blocksize)) { | |
1566 | printk (KERN_ERR | |
1567 | "EXT3-fs: unsupported inode size: %d\n", | |
1568 | sbi->s_inode_size); | |
1569 | goto failed_mount; | |
1570 | } | |
1571 | } | |
1572 | sbi->s_frag_size = EXT3_MIN_FRAG_SIZE << | |
1573 | le32_to_cpu(es->s_log_frag_size); | |
1574 | if (blocksize != sbi->s_frag_size) { | |
1575 | printk(KERN_ERR | |
1576 | "EXT3-fs: fragsize %lu != blocksize %u (unsupported)\n", | |
1577 | sbi->s_frag_size, blocksize); | |
1578 | goto failed_mount; | |
1579 | } | |
1580 | sbi->s_frags_per_block = 1; | |
1581 | sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group); | |
1582 | sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group); | |
1583 | sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group); | |
1584 | if (EXT3_INODE_SIZE(sb) == 0) | |
1585 | goto cantfind_ext3; | |
1586 | sbi->s_inodes_per_block = blocksize / EXT3_INODE_SIZE(sb); | |
1587 | if (sbi->s_inodes_per_block == 0) | |
1588 | goto cantfind_ext3; | |
1589 | sbi->s_itb_per_group = sbi->s_inodes_per_group / | |
1590 | sbi->s_inodes_per_block; | |
1591 | sbi->s_desc_per_block = blocksize / sizeof(struct ext3_group_desc); | |
1592 | sbi->s_sbh = bh; | |
1593 | sbi->s_mount_state = le16_to_cpu(es->s_state); | |
1594 | sbi->s_addr_per_block_bits = log2(EXT3_ADDR_PER_BLOCK(sb)); | |
1595 | sbi->s_desc_per_block_bits = log2(EXT3_DESC_PER_BLOCK(sb)); | |
1596 | for (i=0; i < 4; i++) | |
1597 | sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]); | |
1598 | sbi->s_def_hash_version = es->s_def_hash_version; | |
1599 | ||
1600 | if (sbi->s_blocks_per_group > blocksize * 8) { | |
1601 | printk (KERN_ERR | |
1602 | "EXT3-fs: #blocks per group too big: %lu\n", | |
1603 | sbi->s_blocks_per_group); | |
1604 | goto failed_mount; | |
1605 | } | |
1606 | if (sbi->s_frags_per_group > blocksize * 8) { | |
1607 | printk (KERN_ERR | |
1608 | "EXT3-fs: #fragments per group too big: %lu\n", | |
1609 | sbi->s_frags_per_group); | |
1610 | goto failed_mount; | |
1611 | } | |
1612 | if (sbi->s_inodes_per_group > blocksize * 8) { | |
1613 | printk (KERN_ERR | |
1614 | "EXT3-fs: #inodes per group too big: %lu\n", | |
1615 | sbi->s_inodes_per_group); | |
1616 | goto failed_mount; | |
1617 | } | |
1618 | ||
fcd5df35 MC |
1619 | if (le32_to_cpu(es->s_blocks_count) > |
1620 | (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) { | |
1621 | printk(KERN_ERR "EXT3-fs: filesystem on %s:" | |
1622 | " too large to mount safely\n", sb->s_id); | |
1623 | if (sizeof(sector_t) < 8) | |
1624 | printk(KERN_WARNING "EXT3-fs: CONFIG_LBD not " | |
1625 | "enabled\n"); | |
1626 | goto failed_mount; | |
1627 | } | |
1628 | ||
1da177e4 LT |
1629 | if (EXT3_BLOCKS_PER_GROUP(sb) == 0) |
1630 | goto cantfind_ext3; | |
855565e8 ES |
1631 | sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) - |
1632 | le32_to_cpu(es->s_first_data_block) - 1) | |
1633 | / EXT3_BLOCKS_PER_GROUP(sb)) + 1; | |
1da177e4 LT |
1634 | db_count = (sbi->s_groups_count + EXT3_DESC_PER_BLOCK(sb) - 1) / |
1635 | EXT3_DESC_PER_BLOCK(sb); | |
1636 | sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *), | |
1637 | GFP_KERNEL); | |
1638 | if (sbi->s_group_desc == NULL) { | |
1639 | printk (KERN_ERR "EXT3-fs: not enough memory\n"); | |
1640 | goto failed_mount; | |
1641 | } | |
1642 | ||
1da177e4 LT |
1643 | bgl_lock_init(&sbi->s_blockgroup_lock); |
1644 | ||
1645 | for (i = 0; i < db_count; i++) { | |
1646 | block = descriptor_loc(sb, logic_sb_block, i); | |
1647 | sbi->s_group_desc[i] = sb_bread(sb, block); | |
1648 | if (!sbi->s_group_desc[i]) { | |
1649 | printk (KERN_ERR "EXT3-fs: " | |
1650 | "can't read group descriptor %d\n", i); | |
1651 | db_count = i; | |
1652 | goto failed_mount2; | |
1653 | } | |
1654 | } | |
1655 | if (!ext3_check_descriptors (sb)) { | |
d2e5b13c | 1656 | printk(KERN_ERR "EXT3-fs: group descriptors corrupted!\n"); |
1da177e4 LT |
1657 | goto failed_mount2; |
1658 | } | |
1659 | sbi->s_gdb_count = db_count; | |
1660 | get_random_bytes(&sbi->s_next_generation, sizeof(u32)); | |
1661 | spin_lock_init(&sbi->s_next_gen_lock); | |
0216bfcf MC |
1662 | |
1663 | percpu_counter_init(&sbi->s_freeblocks_counter, | |
1664 | ext3_count_free_blocks(sb)); | |
1665 | percpu_counter_init(&sbi->s_freeinodes_counter, | |
1666 | ext3_count_free_inodes(sb)); | |
1667 | percpu_counter_init(&sbi->s_dirs_counter, | |
1668 | ext3_count_dirs(sb)); | |
1669 | ||
1da177e4 LT |
1670 | /* per fileystem reservation list head & lock */ |
1671 | spin_lock_init(&sbi->s_rsv_window_lock); | |
1672 | sbi->s_rsv_window_root = RB_ROOT; | |
1673 | /* Add a single, static dummy reservation to the start of the | |
1674 | * reservation window list --- it gives us a placeholder for | |
1675 | * append-at-start-of-list which makes the allocation logic | |
1676 | * _much_ simpler. */ | |
1677 | sbi->s_rsv_window_head.rsv_start = EXT3_RESERVE_WINDOW_NOT_ALLOCATED; | |
1678 | sbi->s_rsv_window_head.rsv_end = EXT3_RESERVE_WINDOW_NOT_ALLOCATED; | |
1679 | sbi->s_rsv_window_head.rsv_alloc_hit = 0; | |
1680 | sbi->s_rsv_window_head.rsv_goal_size = 0; | |
1681 | ext3_rsv_window_add(sb, &sbi->s_rsv_window_head); | |
1682 | ||
1683 | /* | |
1684 | * set up enough so that it can read an inode | |
1685 | */ | |
1686 | sb->s_op = &ext3_sops; | |
1687 | sb->s_export_op = &ext3_export_ops; | |
1688 | sb->s_xattr = ext3_xattr_handlers; | |
1689 | #ifdef CONFIG_QUOTA | |
1690 | sb->s_qcop = &ext3_qctl_operations; | |
1691 | sb->dq_op = &ext3_quota_operations; | |
1692 | #endif | |
1693 | INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */ | |
1694 | ||
1695 | sb->s_root = NULL; | |
1696 | ||
1697 | needs_recovery = (es->s_last_orphan != 0 || | |
1698 | EXT3_HAS_INCOMPAT_FEATURE(sb, | |
1699 | EXT3_FEATURE_INCOMPAT_RECOVER)); | |
1700 | ||
1701 | /* | |
1702 | * The first inode we look at is the journal inode. Don't try | |
1703 | * root first: it may be modified in the journal! | |
1704 | */ | |
1705 | if (!test_opt(sb, NOLOAD) && | |
1706 | EXT3_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) { | |
71b96257 | 1707 | if (ext3_load_journal(sb, es, journal_devnum)) |
0216bfcf | 1708 | goto failed_mount3; |
1da177e4 LT |
1709 | } else if (journal_inum) { |
1710 | if (ext3_create_journal(sb, es, journal_inum)) | |
0216bfcf | 1711 | goto failed_mount3; |
1da177e4 LT |
1712 | } else { |
1713 | if (!silent) | |
1714 | printk (KERN_ERR | |
1715 | "ext3: No journal on filesystem on %s\n", | |
1716 | sb->s_id); | |
0216bfcf | 1717 | goto failed_mount3; |
1da177e4 LT |
1718 | } |
1719 | ||
1720 | /* We have now updated the journal if required, so we can | |
1721 | * validate the data journaling mode. */ | |
1722 | switch (test_opt(sb, DATA_FLAGS)) { | |
1723 | case 0: | |
1724 | /* No mode set, assume a default based on the journal | |
1725 | capabilities: ORDERED_DATA if the journal can | |
1726 | cope, else JOURNAL_DATA */ | |
1727 | if (journal_check_available_features | |
1728 | (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE)) | |
1729 | set_opt(sbi->s_mount_opt, ORDERED_DATA); | |
1730 | else | |
1731 | set_opt(sbi->s_mount_opt, JOURNAL_DATA); | |
1732 | break; | |
1733 | ||
1734 | case EXT3_MOUNT_ORDERED_DATA: | |
1735 | case EXT3_MOUNT_WRITEBACK_DATA: | |
1736 | if (!journal_check_available_features | |
1737 | (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE)) { | |
1738 | printk(KERN_ERR "EXT3-fs: Journal does not support " | |
1739 | "requested data journaling mode\n"); | |
0216bfcf | 1740 | goto failed_mount4; |
1da177e4 LT |
1741 | } |
1742 | default: | |
1743 | break; | |
1744 | } | |
1745 | ||
1746 | if (test_opt(sb, NOBH)) { | |
1da177e4 LT |
1747 | if (!(test_opt(sb, DATA_FLAGS) == EXT3_MOUNT_WRITEBACK_DATA)) { |
1748 | printk(KERN_WARNING "EXT3-fs: Ignoring nobh option - " | |
1749 | "its supported only with writeback mode\n"); | |
1750 | clear_opt(sbi->s_mount_opt, NOBH); | |
1751 | } | |
1752 | } | |
1753 | /* | |
1754 | * The journal_load will have done any necessary log recovery, | |
1755 | * so we can safely mount the rest of the filesystem now. | |
1756 | */ | |
1757 | ||
1758 | root = iget(sb, EXT3_ROOT_INO); | |
1759 | sb->s_root = d_alloc_root(root); | |
1760 | if (!sb->s_root) { | |
1761 | printk(KERN_ERR "EXT3-fs: get root inode failed\n"); | |
1762 | iput(root); | |
0216bfcf | 1763 | goto failed_mount4; |
1da177e4 LT |
1764 | } |
1765 | if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { | |
1766 | dput(sb->s_root); | |
1767 | sb->s_root = NULL; | |
1768 | printk(KERN_ERR "EXT3-fs: corrupt root inode, run e2fsck\n"); | |
0216bfcf | 1769 | goto failed_mount4; |
1da177e4 LT |
1770 | } |
1771 | ||
1772 | ext3_setup_super (sb, es, sb->s_flags & MS_RDONLY); | |
1773 | /* | |
1774 | * akpm: core read_super() calls in here with the superblock locked. | |
1775 | * That deadlocks, because orphan cleanup needs to lock the superblock | |
1776 | * in numerous places. Here we just pop the lock - it's relatively | |
1777 | * harmless, because we are now ready to accept write_super() requests, | |
1778 | * and aviro says that's the only reason for hanging onto the | |
1779 | * superblock lock. | |
1780 | */ | |
1781 | EXT3_SB(sb)->s_mount_state |= EXT3_ORPHAN_FS; | |
1782 | ext3_orphan_cleanup(sb, es); | |
1783 | EXT3_SB(sb)->s_mount_state &= ~EXT3_ORPHAN_FS; | |
1784 | if (needs_recovery) | |
1785 | printk (KERN_INFO "EXT3-fs: recovery complete.\n"); | |
1786 | ext3_mark_recovery_complete(sb, es); | |
1787 | printk (KERN_INFO "EXT3-fs: mounted filesystem with %s data mode.\n", | |
1788 | test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA ? "journal": | |
1789 | test_opt(sb,DATA_FLAGS) == EXT3_MOUNT_ORDERED_DATA ? "ordered": | |
1790 | "writeback"); | |
1791 | ||
1da177e4 LT |
1792 | lock_kernel(); |
1793 | return 0; | |
1794 | ||
1795 | cantfind_ext3: | |
1796 | if (!silent) | |
1797 | printk(KERN_ERR "VFS: Can't find ext3 filesystem on dev %s.\n", | |
1798 | sb->s_id); | |
1799 | goto failed_mount; | |
1800 | ||
0216bfcf | 1801 | failed_mount4: |
1da177e4 | 1802 | journal_destroy(sbi->s_journal); |
0216bfcf MC |
1803 | failed_mount3: |
1804 | percpu_counter_destroy(&sbi->s_freeblocks_counter); | |
1805 | percpu_counter_destroy(&sbi->s_freeinodes_counter); | |
1806 | percpu_counter_destroy(&sbi->s_dirs_counter); | |
1da177e4 LT |
1807 | failed_mount2: |
1808 | for (i = 0; i < db_count; i++) | |
1809 | brelse(sbi->s_group_desc[i]); | |
1810 | kfree(sbi->s_group_desc); | |
1811 | failed_mount: | |
1812 | #ifdef CONFIG_QUOTA | |
1813 | for (i = 0; i < MAXQUOTAS; i++) | |
1814 | kfree(sbi->s_qf_names[i]); | |
1815 | #endif | |
1816 | ext3_blkdev_remove(sbi); | |
1817 | brelse(bh); | |
1818 | out_fail: | |
1819 | sb->s_fs_info = NULL; | |
1820 | kfree(sbi); | |
1821 | lock_kernel(); | |
1822 | return -EINVAL; | |
1823 | } | |
1824 | ||
1825 | /* | |
1826 | * Setup any per-fs journal parameters now. We'll do this both on | |
1827 | * initial mount, once the journal has been initialised but before we've | |
ae6ddcc5 | 1828 | * done any recovery; and again on any subsequent remount. |
1da177e4 LT |
1829 | */ |
1830 | static void ext3_init_journal_params(struct super_block *sb, journal_t *journal) | |
1831 | { | |
1832 | struct ext3_sb_info *sbi = EXT3_SB(sb); | |
1833 | ||
1834 | if (sbi->s_commit_interval) | |
1835 | journal->j_commit_interval = sbi->s_commit_interval; | |
1836 | /* We could also set up an ext3-specific default for the commit | |
1837 | * interval here, but for now we'll just fall back to the jbd | |
1838 | * default. */ | |
1839 | ||
1840 | spin_lock(&journal->j_state_lock); | |
1841 | if (test_opt(sb, BARRIER)) | |
1842 | journal->j_flags |= JFS_BARRIER; | |
1843 | else | |
1844 | journal->j_flags &= ~JFS_BARRIER; | |
1845 | spin_unlock(&journal->j_state_lock); | |
1846 | } | |
1847 | ||
eee194e7 ES |
1848 | static journal_t *ext3_get_journal(struct super_block *sb, |
1849 | unsigned int journal_inum) | |
1da177e4 LT |
1850 | { |
1851 | struct inode *journal_inode; | |
1852 | journal_t *journal; | |
1853 | ||
1854 | /* First, test for the existence of a valid inode on disk. Bad | |
1855 | * things happen if we iget() an unused inode, as the subsequent | |
1856 | * iput() will try to delete it. */ | |
1857 | ||
1858 | journal_inode = iget(sb, journal_inum); | |
1859 | if (!journal_inode) { | |
1860 | printk(KERN_ERR "EXT3-fs: no journal found.\n"); | |
1861 | return NULL; | |
1862 | } | |
1863 | if (!journal_inode->i_nlink) { | |
1864 | make_bad_inode(journal_inode); | |
1865 | iput(journal_inode); | |
1866 | printk(KERN_ERR "EXT3-fs: journal inode is deleted.\n"); | |
1867 | return NULL; | |
1868 | } | |
1869 | ||
1870 | jbd_debug(2, "Journal inode found at %p: %Ld bytes\n", | |
1871 | journal_inode, journal_inode->i_size); | |
1872 | if (is_bad_inode(journal_inode) || !S_ISREG(journal_inode->i_mode)) { | |
1873 | printk(KERN_ERR "EXT3-fs: invalid journal inode.\n"); | |
1874 | iput(journal_inode); | |
1875 | return NULL; | |
1876 | } | |
1877 | ||
1878 | journal = journal_init_inode(journal_inode); | |
1879 | if (!journal) { | |
1880 | printk(KERN_ERR "EXT3-fs: Could not load journal inode\n"); | |
1881 | iput(journal_inode); | |
1882 | return NULL; | |
1883 | } | |
1884 | journal->j_private = sb; | |
1885 | ext3_init_journal_params(sb, journal); | |
1886 | return journal; | |
1887 | } | |
1888 | ||
1889 | static journal_t *ext3_get_dev_journal(struct super_block *sb, | |
1890 | dev_t j_dev) | |
1891 | { | |
1892 | struct buffer_head * bh; | |
1893 | journal_t *journal; | |
43d23f90 | 1894 | ext3_fsblk_t start; |
1c2bf374 | 1895 | ext3_fsblk_t len; |
1da177e4 | 1896 | int hblock, blocksize; |
43d23f90 | 1897 | ext3_fsblk_t sb_block; |
1da177e4 LT |
1898 | unsigned long offset; |
1899 | struct ext3_super_block * es; | |
1900 | struct block_device *bdev; | |
1901 | ||
1902 | bdev = ext3_blkdev_get(j_dev); | |
1903 | if (bdev == NULL) | |
1904 | return NULL; | |
1905 | ||
1906 | if (bd_claim(bdev, sb)) { | |
1907 | printk(KERN_ERR | |
1908 | "EXT3: failed to claim external journal device.\n"); | |
1909 | blkdev_put(bdev); | |
1910 | return NULL; | |
1911 | } | |
1912 | ||
1913 | blocksize = sb->s_blocksize; | |
1914 | hblock = bdev_hardsect_size(bdev); | |
1915 | if (blocksize < hblock) { | |
1916 | printk(KERN_ERR | |
1917 | "EXT3-fs: blocksize too small for journal device.\n"); | |
1918 | goto out_bdev; | |
1919 | } | |
1920 | ||
1921 | sb_block = EXT3_MIN_BLOCK_SIZE / blocksize; | |
1922 | offset = EXT3_MIN_BLOCK_SIZE % blocksize; | |
1923 | set_blocksize(bdev, blocksize); | |
1924 | if (!(bh = __bread(bdev, sb_block, blocksize))) { | |
1925 | printk(KERN_ERR "EXT3-fs: couldn't read superblock of " | |
1926 | "external journal\n"); | |
1927 | goto out_bdev; | |
1928 | } | |
1929 | ||
1930 | es = (struct ext3_super_block *) (((char *)bh->b_data) + offset); | |
1931 | if ((le16_to_cpu(es->s_magic) != EXT3_SUPER_MAGIC) || | |
1932 | !(le32_to_cpu(es->s_feature_incompat) & | |
1933 | EXT3_FEATURE_INCOMPAT_JOURNAL_DEV)) { | |
1934 | printk(KERN_ERR "EXT3-fs: external journal has " | |
1935 | "bad superblock\n"); | |
1936 | brelse(bh); | |
1937 | goto out_bdev; | |
1938 | } | |
1939 | ||
1940 | if (memcmp(EXT3_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) { | |
1941 | printk(KERN_ERR "EXT3-fs: journal UUID does not match\n"); | |
1942 | brelse(bh); | |
1943 | goto out_bdev; | |
1944 | } | |
1945 | ||
1946 | len = le32_to_cpu(es->s_blocks_count); | |
1947 | start = sb_block + 1; | |
1948 | brelse(bh); /* we're done with the superblock */ | |
1949 | ||
1950 | journal = journal_init_dev(bdev, sb->s_bdev, | |
1951 | start, len, blocksize); | |
1952 | if (!journal) { | |
1953 | printk(KERN_ERR "EXT3-fs: failed to create device journal\n"); | |
1954 | goto out_bdev; | |
1955 | } | |
1956 | journal->j_private = sb; | |
1957 | ll_rw_block(READ, 1, &journal->j_sb_buffer); | |
1958 | wait_on_buffer(journal->j_sb_buffer); | |
1959 | if (!buffer_uptodate(journal->j_sb_buffer)) { | |
1960 | printk(KERN_ERR "EXT3-fs: I/O error on journal device\n"); | |
1961 | goto out_journal; | |
1962 | } | |
1963 | if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) { | |
1964 | printk(KERN_ERR "EXT3-fs: External journal has more than one " | |
1965 | "user (unsupported) - %d\n", | |
1966 | be32_to_cpu(journal->j_superblock->s_nr_users)); | |
1967 | goto out_journal; | |
1968 | } | |
1969 | EXT3_SB(sb)->journal_bdev = bdev; | |
1970 | ext3_init_journal_params(sb, journal); | |
1971 | return journal; | |
1972 | out_journal: | |
1973 | journal_destroy(journal); | |
1974 | out_bdev: | |
1975 | ext3_blkdev_put(bdev); | |
1976 | return NULL; | |
1977 | } | |
1978 | ||
71b96257 JL |
1979 | static int ext3_load_journal(struct super_block *sb, |
1980 | struct ext3_super_block *es, | |
1981 | unsigned long journal_devnum) | |
1da177e4 LT |
1982 | { |
1983 | journal_t *journal; | |
eee194e7 | 1984 | unsigned int journal_inum = le32_to_cpu(es->s_journal_inum); |
71b96257 | 1985 | dev_t journal_dev; |
1da177e4 LT |
1986 | int err = 0; |
1987 | int really_read_only; | |
1988 | ||
71b96257 JL |
1989 | if (journal_devnum && |
1990 | journal_devnum != le32_to_cpu(es->s_journal_dev)) { | |
1991 | printk(KERN_INFO "EXT3-fs: external journal device major/minor " | |
1992 | "numbers have changed\n"); | |
1993 | journal_dev = new_decode_dev(journal_devnum); | |
1994 | } else | |
1995 | journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev)); | |
1996 | ||
1da177e4 LT |
1997 | really_read_only = bdev_read_only(sb->s_bdev); |
1998 | ||
1999 | /* | |
2000 | * Are we loading a blank journal or performing recovery after a | |
2001 | * crash? For recovery, we need to check in advance whether we | |
2002 | * can get read-write access to the device. | |
2003 | */ | |
2004 | ||
2005 | if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER)) { | |
2006 | if (sb->s_flags & MS_RDONLY) { | |
2007 | printk(KERN_INFO "EXT3-fs: INFO: recovery " | |
2008 | "required on readonly filesystem.\n"); | |
2009 | if (really_read_only) { | |
2010 | printk(KERN_ERR "EXT3-fs: write access " | |
2011 | "unavailable, cannot proceed.\n"); | |
2012 | return -EROFS; | |
2013 | } | |
2014 | printk (KERN_INFO "EXT3-fs: write access will " | |
2015 | "be enabled during recovery.\n"); | |
2016 | } | |
2017 | } | |
2018 | ||
2019 | if (journal_inum && journal_dev) { | |
2020 | printk(KERN_ERR "EXT3-fs: filesystem has both journal " | |
2021 | "and inode journals!\n"); | |
2022 | return -EINVAL; | |
2023 | } | |
2024 | ||
2025 | if (journal_inum) { | |
2026 | if (!(journal = ext3_get_journal(sb, journal_inum))) | |
2027 | return -EINVAL; | |
2028 | } else { | |
2029 | if (!(journal = ext3_get_dev_journal(sb, journal_dev))) | |
2030 | return -EINVAL; | |
2031 | } | |
2032 | ||
2033 | if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) { | |
2034 | err = journal_update_format(journal); | |
2035 | if (err) { | |
2036 | printk(KERN_ERR "EXT3-fs: error updating journal.\n"); | |
2037 | journal_destroy(journal); | |
2038 | return err; | |
2039 | } | |
2040 | } | |
2041 | ||
2042 | if (!EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER)) | |
2043 | err = journal_wipe(journal, !really_read_only); | |
2044 | if (!err) | |
2045 | err = journal_load(journal); | |
2046 | ||
2047 | if (err) { | |
2048 | printk(KERN_ERR "EXT3-fs: error loading journal.\n"); | |
2049 | journal_destroy(journal); | |
2050 | return err; | |
2051 | } | |
2052 | ||
2053 | EXT3_SB(sb)->s_journal = journal; | |
2054 | ext3_clear_journal_err(sb, es); | |
71b96257 JL |
2055 | |
2056 | if (journal_devnum && | |
2057 | journal_devnum != le32_to_cpu(es->s_journal_dev)) { | |
2058 | es->s_journal_dev = cpu_to_le32(journal_devnum); | |
2059 | sb->s_dirt = 1; | |
2060 | ||
2061 | /* Make sure we flush the recovery flag to disk. */ | |
2062 | ext3_commit_super(sb, es, 1); | |
2063 | } | |
2064 | ||
1da177e4 LT |
2065 | return 0; |
2066 | } | |
2067 | ||
2068 | static int ext3_create_journal(struct super_block * sb, | |
2069 | struct ext3_super_block * es, | |
eee194e7 | 2070 | unsigned int journal_inum) |
1da177e4 LT |
2071 | { |
2072 | journal_t *journal; | |
2073 | ||
2074 | if (sb->s_flags & MS_RDONLY) { | |
2075 | printk(KERN_ERR "EXT3-fs: readonly filesystem when trying to " | |
2076 | "create journal.\n"); | |
2077 | return -EROFS; | |
2078 | } | |
2079 | ||
2080 | if (!(journal = ext3_get_journal(sb, journal_inum))) | |
2081 | return -EINVAL; | |
2082 | ||
eee194e7 | 2083 | printk(KERN_INFO "EXT3-fs: creating new journal on inode %u\n", |
1da177e4 LT |
2084 | journal_inum); |
2085 | ||
2086 | if (journal_create(journal)) { | |
2087 | printk(KERN_ERR "EXT3-fs: error creating journal.\n"); | |
2088 | journal_destroy(journal); | |
2089 | return -EIO; | |
2090 | } | |
2091 | ||
2092 | EXT3_SB(sb)->s_journal = journal; | |
2093 | ||
2094 | ext3_update_dynamic_rev(sb); | |
2095 | EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER); | |
2096 | EXT3_SET_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL); | |
2097 | ||
2098 | es->s_journal_inum = cpu_to_le32(journal_inum); | |
2099 | sb->s_dirt = 1; | |
2100 | ||
2101 | /* Make sure we flush the recovery flag to disk. */ | |
2102 | ext3_commit_super(sb, es, 1); | |
2103 | ||
2104 | return 0; | |
2105 | } | |
2106 | ||
2107 | static void ext3_commit_super (struct super_block * sb, | |
2108 | struct ext3_super_block * es, | |
2109 | int sync) | |
2110 | { | |
2111 | struct buffer_head *sbh = EXT3_SB(sb)->s_sbh; | |
2112 | ||
2113 | if (!sbh) | |
2114 | return; | |
2115 | es->s_wtime = cpu_to_le32(get_seconds()); | |
2116 | es->s_free_blocks_count = cpu_to_le32(ext3_count_free_blocks(sb)); | |
2117 | es->s_free_inodes_count = cpu_to_le32(ext3_count_free_inodes(sb)); | |
2118 | BUFFER_TRACE(sbh, "marking dirty"); | |
2119 | mark_buffer_dirty(sbh); | |
2120 | if (sync) | |
2121 | sync_dirty_buffer(sbh); | |
2122 | } | |
2123 | ||
2124 | ||
2125 | /* | |
2126 | * Have we just finished recovery? If so, and if we are mounting (or | |
2127 | * remounting) the filesystem readonly, then we will end up with a | |
2128 | * consistent fs on disk. Record that fact. | |
2129 | */ | |
2130 | static void ext3_mark_recovery_complete(struct super_block * sb, | |
2131 | struct ext3_super_block * es) | |
2132 | { | |
2133 | journal_t *journal = EXT3_SB(sb)->s_journal; | |
2134 | ||
2135 | journal_lock_updates(journal); | |
2136 | journal_flush(journal); | |
2137 | if (EXT3_HAS_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER) && | |
2138 | sb->s_flags & MS_RDONLY) { | |
2139 | EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER); | |
2140 | sb->s_dirt = 0; | |
2141 | ext3_commit_super(sb, es, 1); | |
2142 | } | |
2143 | journal_unlock_updates(journal); | |
2144 | } | |
2145 | ||
2146 | /* | |
2147 | * If we are mounting (or read-write remounting) a filesystem whose journal | |
2148 | * has recorded an error from a previous lifetime, move that error to the | |
2149 | * main filesystem now. | |
2150 | */ | |
2151 | static void ext3_clear_journal_err(struct super_block * sb, | |
2152 | struct ext3_super_block * es) | |
2153 | { | |
2154 | journal_t *journal; | |
2155 | int j_errno; | |
2156 | const char *errstr; | |
2157 | ||
2158 | journal = EXT3_SB(sb)->s_journal; | |
2159 | ||
2160 | /* | |
2161 | * Now check for any error status which may have been recorded in the | |
2162 | * journal by a prior ext3_error() or ext3_abort() | |
2163 | */ | |
2164 | ||
2165 | j_errno = journal_errno(journal); | |
2166 | if (j_errno) { | |
2167 | char nbuf[16]; | |
2168 | ||
2169 | errstr = ext3_decode_error(sb, j_errno, nbuf); | |
2170 | ext3_warning(sb, __FUNCTION__, "Filesystem error recorded " | |
2171 | "from previous mount: %s", errstr); | |
2172 | ext3_warning(sb, __FUNCTION__, "Marking fs in need of " | |
2173 | "filesystem check."); | |
2174 | ||
2175 | EXT3_SB(sb)->s_mount_state |= EXT3_ERROR_FS; | |
2176 | es->s_state |= cpu_to_le16(EXT3_ERROR_FS); | |
2177 | ext3_commit_super (sb, es, 1); | |
2178 | ||
2179 | journal_clear_err(journal); | |
2180 | } | |
2181 | } | |
2182 | ||
2183 | /* | |
2184 | * Force the running and committing transactions to commit, | |
2185 | * and wait on the commit. | |
2186 | */ | |
2187 | int ext3_force_commit(struct super_block *sb) | |
2188 | { | |
2189 | journal_t *journal; | |
2190 | int ret; | |
2191 | ||
2192 | if (sb->s_flags & MS_RDONLY) | |
2193 | return 0; | |
2194 | ||
2195 | journal = EXT3_SB(sb)->s_journal; | |
2196 | sb->s_dirt = 0; | |
2197 | ret = ext3_journal_force_commit(journal); | |
2198 | return ret; | |
2199 | } | |
2200 | ||
2201 | /* | |
2202 | * Ext3 always journals updates to the superblock itself, so we don't | |
2203 | * have to propagate any other updates to the superblock on disk at this | |
2204 | * point. Just start an async writeback to get the buffers on their way | |
2205 | * to the disk. | |
2206 | * | |
2207 | * This implicitly triggers the writebehind on sync(). | |
2208 | */ | |
2209 | ||
2210 | static void ext3_write_super (struct super_block * sb) | |
2211 | { | |
7892f2f4 | 2212 | if (mutex_trylock(&sb->s_lock) != 0) |
1da177e4 LT |
2213 | BUG(); |
2214 | sb->s_dirt = 0; | |
2215 | } | |
2216 | ||
2217 | static int ext3_sync_fs(struct super_block *sb, int wait) | |
2218 | { | |
2219 | tid_t target; | |
2220 | ||
2221 | sb->s_dirt = 0; | |
2222 | if (journal_start_commit(EXT3_SB(sb)->s_journal, &target)) { | |
2223 | if (wait) | |
2224 | log_wait_commit(EXT3_SB(sb)->s_journal, target); | |
2225 | } | |
2226 | return 0; | |
2227 | } | |
2228 | ||
2229 | /* | |
2230 | * LVM calls this function before a (read-only) snapshot is created. This | |
2231 | * gives us a chance to flush the journal completely and mark the fs clean. | |
2232 | */ | |
2233 | static void ext3_write_super_lockfs(struct super_block *sb) | |
2234 | { | |
2235 | sb->s_dirt = 0; | |
2236 | ||
2237 | if (!(sb->s_flags & MS_RDONLY)) { | |
2238 | journal_t *journal = EXT3_SB(sb)->s_journal; | |
2239 | ||
2240 | /* Now we set up the journal barrier. */ | |
2241 | journal_lock_updates(journal); | |
2242 | journal_flush(journal); | |
2243 | ||
2244 | /* Journal blocked and flushed, clear needs_recovery flag. */ | |
2245 | EXT3_CLEAR_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER); | |
2246 | ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1); | |
2247 | } | |
2248 | } | |
2249 | ||
2250 | /* | |
2251 | * Called by LVM after the snapshot is done. We need to reset the RECOVER | |
2252 | * flag here, even though the filesystem is not technically dirty yet. | |
2253 | */ | |
2254 | static void ext3_unlockfs(struct super_block *sb) | |
2255 | { | |
2256 | if (!(sb->s_flags & MS_RDONLY)) { | |
2257 | lock_super(sb); | |
2258 | /* Reser the needs_recovery flag before the fs is unlocked. */ | |
2259 | EXT3_SET_INCOMPAT_FEATURE(sb, EXT3_FEATURE_INCOMPAT_RECOVER); | |
2260 | ext3_commit_super(sb, EXT3_SB(sb)->s_es, 1); | |
2261 | unlock_super(sb); | |
2262 | journal_unlock_updates(EXT3_SB(sb)->s_journal); | |
2263 | } | |
2264 | } | |
2265 | ||
2266 | static int ext3_remount (struct super_block * sb, int * flags, char * data) | |
2267 | { | |
2268 | struct ext3_super_block * es; | |
2269 | struct ext3_sb_info *sbi = EXT3_SB(sb); | |
43d23f90 | 2270 | ext3_fsblk_t n_blocks_count = 0; |
08c6a96f JK |
2271 | unsigned long old_sb_flags; |
2272 | struct ext3_mount_options old_opts; | |
2273 | int err; | |
2274 | #ifdef CONFIG_QUOTA | |
2275 | int i; | |
2276 | #endif | |
2277 | ||
2278 | /* Store the original options */ | |
2279 | old_sb_flags = sb->s_flags; | |
2280 | old_opts.s_mount_opt = sbi->s_mount_opt; | |
2281 | old_opts.s_resuid = sbi->s_resuid; | |
2282 | old_opts.s_resgid = sbi->s_resgid; | |
2283 | old_opts.s_commit_interval = sbi->s_commit_interval; | |
2284 | #ifdef CONFIG_QUOTA | |
2285 | old_opts.s_jquota_fmt = sbi->s_jquota_fmt; | |
2286 | for (i = 0; i < MAXQUOTAS; i++) | |
2287 | old_opts.s_qf_names[i] = sbi->s_qf_names[i]; | |
2288 | #endif | |
1da177e4 LT |
2289 | |
2290 | /* | |
2291 | * Allow the "check" option to be passed as a remount option. | |
2292 | */ | |
71b96257 | 2293 | if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) { |
08c6a96f JK |
2294 | err = -EINVAL; |
2295 | goto restore_opts; | |
2296 | } | |
1da177e4 LT |
2297 | |
2298 | if (sbi->s_mount_opt & EXT3_MOUNT_ABORT) | |
2299 | ext3_abort(sb, __FUNCTION__, "Abort forced by user"); | |
2300 | ||
2301 | sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | | |
2302 | ((sbi->s_mount_opt & EXT3_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0); | |
2303 | ||
2304 | es = sbi->s_es; | |
2305 | ||
2306 | ext3_init_journal_params(sb, sbi->s_journal); | |
2307 | ||
2308 | if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) || | |
2309 | n_blocks_count > le32_to_cpu(es->s_blocks_count)) { | |
08c6a96f JK |
2310 | if (sbi->s_mount_opt & EXT3_MOUNT_ABORT) { |
2311 | err = -EROFS; | |
2312 | goto restore_opts; | |
2313 | } | |
1da177e4 LT |
2314 | |
2315 | if (*flags & MS_RDONLY) { | |
2316 | /* | |
2317 | * First of all, the unconditional stuff we have to do | |
2318 | * to disable replay of the journal when we next remount | |
2319 | */ | |
2320 | sb->s_flags |= MS_RDONLY; | |
2321 | ||
2322 | /* | |
2323 | * OK, test if we are remounting a valid rw partition | |
2324 | * readonly, and if so set the rdonly flag and then | |
2325 | * mark the partition as valid again. | |
2326 | */ | |
2327 | if (!(es->s_state & cpu_to_le16(EXT3_VALID_FS)) && | |
2328 | (sbi->s_mount_state & EXT3_VALID_FS)) | |
2329 | es->s_state = cpu_to_le16(sbi->s_mount_state); | |
2330 | ||
2331 | ext3_mark_recovery_complete(sb, es); | |
2332 | } else { | |
2333 | __le32 ret; | |
2334 | if ((ret = EXT3_HAS_RO_COMPAT_FEATURE(sb, | |
2335 | ~EXT3_FEATURE_RO_COMPAT_SUPP))) { | |
2336 | printk(KERN_WARNING "EXT3-fs: %s: couldn't " | |
2337 | "remount RDWR because of unsupported " | |
2338 | "optional features (%x).\n", | |
2339 | sb->s_id, le32_to_cpu(ret)); | |
08c6a96f JK |
2340 | err = -EROFS; |
2341 | goto restore_opts; | |
1da177e4 LT |
2342 | } |
2343 | /* | |
2344 | * Mounting a RDONLY partition read-write, so reread | |
2345 | * and store the current valid flag. (It may have | |
2346 | * been changed by e2fsck since we originally mounted | |
2347 | * the partition.) | |
2348 | */ | |
2349 | ext3_clear_journal_err(sb, es); | |
2350 | sbi->s_mount_state = le16_to_cpu(es->s_state); | |
08c6a96f JK |
2351 | if ((ret = ext3_group_extend(sb, es, n_blocks_count))) { |
2352 | err = ret; | |
2353 | goto restore_opts; | |
2354 | } | |
1da177e4 LT |
2355 | if (!ext3_setup_super (sb, es, 0)) |
2356 | sb->s_flags &= ~MS_RDONLY; | |
2357 | } | |
2358 | } | |
08c6a96f JK |
2359 | #ifdef CONFIG_QUOTA |
2360 | /* Release old quota file names */ | |
2361 | for (i = 0; i < MAXQUOTAS; i++) | |
2362 | if (old_opts.s_qf_names[i] && | |
2363 | old_opts.s_qf_names[i] != sbi->s_qf_names[i]) | |
2364 | kfree(old_opts.s_qf_names[i]); | |
2365 | #endif | |
1da177e4 | 2366 | return 0; |
08c6a96f JK |
2367 | restore_opts: |
2368 | sb->s_flags = old_sb_flags; | |
2369 | sbi->s_mount_opt = old_opts.s_mount_opt; | |
2370 | sbi->s_resuid = old_opts.s_resuid; | |
2371 | sbi->s_resgid = old_opts.s_resgid; | |
2372 | sbi->s_commit_interval = old_opts.s_commit_interval; | |
2373 | #ifdef CONFIG_QUOTA | |
2374 | sbi->s_jquota_fmt = old_opts.s_jquota_fmt; | |
2375 | for (i = 0; i < MAXQUOTAS; i++) { | |
2376 | if (sbi->s_qf_names[i] && | |
2377 | old_opts.s_qf_names[i] != sbi->s_qf_names[i]) | |
2378 | kfree(sbi->s_qf_names[i]); | |
2379 | sbi->s_qf_names[i] = old_opts.s_qf_names[i]; | |
2380 | } | |
2381 | #endif | |
2382 | return err; | |
1da177e4 LT |
2383 | } |
2384 | ||
726c3342 | 2385 | static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf) |
1da177e4 | 2386 | { |
726c3342 | 2387 | struct super_block *sb = dentry->d_sb; |
09fe316a AT |
2388 | struct ext3_sb_info *sbi = EXT3_SB(sb); |
2389 | struct ext3_super_block *es = sbi->s_es; | |
43d23f90 | 2390 | ext3_fsblk_t overhead; |
1da177e4 LT |
2391 | int i; |
2392 | ||
2393 | if (test_opt (sb, MINIX_DF)) | |
2394 | overhead = 0; | |
2395 | else { | |
2396 | unsigned long ngroups; | |
2397 | ngroups = EXT3_SB(sb)->s_groups_count; | |
2398 | smp_rmb(); | |
2399 | ||
2400 | /* | |
2401 | * Compute the overhead (FS structures) | |
2402 | */ | |
2403 | ||
2404 | /* | |
2405 | * All of the blocks before first_data_block are | |
2406 | * overhead | |
2407 | */ | |
2408 | overhead = le32_to_cpu(es->s_first_data_block); | |
2409 | ||
2410 | /* | |
2411 | * Add the overhead attributed to the superblock and | |
2412 | * block group descriptors. If the sparse superblocks | |
2413 | * feature is turned on, then not all groups have this. | |
2414 | */ | |
2415 | for (i = 0; i < ngroups; i++) { | |
2416 | overhead += ext3_bg_has_super(sb, i) + | |
2417 | ext3_bg_num_gdb(sb, i); | |
2418 | cond_resched(); | |
2419 | } | |
2420 | ||
2421 | /* | |
2422 | * Every block group has an inode bitmap, a block | |
2423 | * bitmap, and an inode table. | |
2424 | */ | |
2425 | overhead += (ngroups * (2 + EXT3_SB(sb)->s_itb_per_group)); | |
2426 | } | |
2427 | ||
2428 | buf->f_type = EXT3_SUPER_MAGIC; | |
2429 | buf->f_bsize = sb->s_blocksize; | |
2430 | buf->f_blocks = le32_to_cpu(es->s_blocks_count) - overhead; | |
09fe316a | 2431 | buf->f_bfree = percpu_counter_sum(&sbi->s_freeblocks_counter); |
1da177e4 LT |
2432 | buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count); |
2433 | if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count)) | |
2434 | buf->f_bavail = 0; | |
2435 | buf->f_files = le32_to_cpu(es->s_inodes_count); | |
09fe316a | 2436 | buf->f_ffree = percpu_counter_sum(&sbi->s_freeinodes_counter); |
1da177e4 LT |
2437 | buf->f_namelen = EXT3_NAME_LEN; |
2438 | return 0; | |
2439 | } | |
2440 | ||
2441 | /* Helper function for writing quotas on sync - we need to start transaction before quota file | |
2442 | * is locked for write. Otherwise the are possible deadlocks: | |
2443 | * Process 1 Process 2 | |
2444 | * ext3_create() quota_sync() | |
2445 | * journal_start() write_dquot() | |
d3be915f IM |
2446 | * DQUOT_INIT() down(dqio_mutex) |
2447 | * down(dqio_mutex) journal_start() | |
1da177e4 LT |
2448 | * |
2449 | */ | |
2450 | ||
2451 | #ifdef CONFIG_QUOTA | |
2452 | ||
2453 | static inline struct inode *dquot_to_inode(struct dquot *dquot) | |
2454 | { | |
2455 | return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type]; | |
2456 | } | |
2457 | ||
2458 | static int ext3_dquot_initialize(struct inode *inode, int type) | |
2459 | { | |
2460 | handle_t *handle; | |
2461 | int ret, err; | |
2462 | ||
2463 | /* We may create quota structure so we need to reserve enough blocks */ | |
1f54587b | 2464 | handle = ext3_journal_start(inode, 2*EXT3_QUOTA_INIT_BLOCKS(inode->i_sb)); |
1da177e4 LT |
2465 | if (IS_ERR(handle)) |
2466 | return PTR_ERR(handle); | |
2467 | ret = dquot_initialize(inode, type); | |
2468 | err = ext3_journal_stop(handle); | |
2469 | if (!ret) | |
2470 | ret = err; | |
2471 | return ret; | |
2472 | } | |
2473 | ||
2474 | static int ext3_dquot_drop(struct inode *inode) | |
2475 | { | |
2476 | handle_t *handle; | |
2477 | int ret, err; | |
2478 | ||
2479 | /* We may delete quota structure so we need to reserve enough blocks */ | |
1f54587b | 2480 | handle = ext3_journal_start(inode, 2*EXT3_QUOTA_DEL_BLOCKS(inode->i_sb)); |
1da177e4 LT |
2481 | if (IS_ERR(handle)) |
2482 | return PTR_ERR(handle); | |
2483 | ret = dquot_drop(inode); | |
2484 | err = ext3_journal_stop(handle); | |
2485 | if (!ret) | |
2486 | ret = err; | |
2487 | return ret; | |
2488 | } | |
2489 | ||
2490 | static int ext3_write_dquot(struct dquot *dquot) | |
2491 | { | |
2492 | int ret, err; | |
2493 | handle_t *handle; | |
2494 | struct inode *inode; | |
2495 | ||
2496 | inode = dquot_to_inode(dquot); | |
2497 | handle = ext3_journal_start(inode, | |
1f54587b | 2498 | EXT3_QUOTA_TRANS_BLOCKS(dquot->dq_sb)); |
1da177e4 LT |
2499 | if (IS_ERR(handle)) |
2500 | return PTR_ERR(handle); | |
2501 | ret = dquot_commit(dquot); | |
2502 | err = ext3_journal_stop(handle); | |
2503 | if (!ret) | |
2504 | ret = err; | |
2505 | return ret; | |
2506 | } | |
2507 | ||
2508 | static int ext3_acquire_dquot(struct dquot *dquot) | |
2509 | { | |
2510 | int ret, err; | |
2511 | handle_t *handle; | |
2512 | ||
2513 | handle = ext3_journal_start(dquot_to_inode(dquot), | |
1f54587b | 2514 | EXT3_QUOTA_INIT_BLOCKS(dquot->dq_sb)); |
1da177e4 LT |
2515 | if (IS_ERR(handle)) |
2516 | return PTR_ERR(handle); | |
2517 | ret = dquot_acquire(dquot); | |
2518 | err = ext3_journal_stop(handle); | |
2519 | if (!ret) | |
2520 | ret = err; | |
2521 | return ret; | |
2522 | } | |
2523 | ||
2524 | static int ext3_release_dquot(struct dquot *dquot) | |
2525 | { | |
2526 | int ret, err; | |
2527 | handle_t *handle; | |
2528 | ||
2529 | handle = ext3_journal_start(dquot_to_inode(dquot), | |
1f54587b | 2530 | EXT3_QUOTA_DEL_BLOCKS(dquot->dq_sb)); |
1da177e4 LT |
2531 | if (IS_ERR(handle)) |
2532 | return PTR_ERR(handle); | |
2533 | ret = dquot_release(dquot); | |
2534 | err = ext3_journal_stop(handle); | |
2535 | if (!ret) | |
2536 | ret = err; | |
2537 | return ret; | |
2538 | } | |
2539 | ||
2540 | static int ext3_mark_dquot_dirty(struct dquot *dquot) | |
2541 | { | |
2542 | /* Are we journalling quotas? */ | |
2543 | if (EXT3_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] || | |
2544 | EXT3_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) { | |
2545 | dquot_mark_dquot_dirty(dquot); | |
2546 | return ext3_write_dquot(dquot); | |
2547 | } else { | |
2548 | return dquot_mark_dquot_dirty(dquot); | |
2549 | } | |
2550 | } | |
2551 | ||
2552 | static int ext3_write_info(struct super_block *sb, int type) | |
2553 | { | |
2554 | int ret, err; | |
2555 | handle_t *handle; | |
2556 | ||
2557 | /* Data block + inode block */ | |
2558 | handle = ext3_journal_start(sb->s_root->d_inode, 2); | |
2559 | if (IS_ERR(handle)) | |
2560 | return PTR_ERR(handle); | |
2561 | ret = dquot_commit_info(sb, type); | |
2562 | err = ext3_journal_stop(handle); | |
2563 | if (!ret) | |
2564 | ret = err; | |
2565 | return ret; | |
2566 | } | |
2567 | ||
2568 | /* | |
2569 | * Turn on quotas during mount time - we need to find | |
2570 | * the quota file and such... | |
2571 | */ | |
2572 | static int ext3_quota_on_mount(struct super_block *sb, int type) | |
2573 | { | |
84de856e CH |
2574 | return vfs_quota_on_mount(sb, EXT3_SB(sb)->s_qf_names[type], |
2575 | EXT3_SB(sb)->s_jquota_fmt, type); | |
1da177e4 LT |
2576 | } |
2577 | ||
2578 | /* | |
2579 | * Standard function to be called on quota_on | |
2580 | */ | |
2581 | static int ext3_quota_on(struct super_block *sb, int type, int format_id, | |
2582 | char *path) | |
2583 | { | |
2584 | int err; | |
2585 | struct nameidata nd; | |
2586 | ||
1f54587b JK |
2587 | if (!test_opt(sb, QUOTA)) |
2588 | return -EINVAL; | |
1da177e4 LT |
2589 | /* Not journalling quota? */ |
2590 | if (!EXT3_SB(sb)->s_qf_names[USRQUOTA] && | |
2591 | !EXT3_SB(sb)->s_qf_names[GRPQUOTA]) | |
2592 | return vfs_quota_on(sb, type, format_id, path); | |
2593 | err = path_lookup(path, LOOKUP_FOLLOW, &nd); | |
2594 | if (err) | |
2595 | return err; | |
2596 | /* Quotafile not on the same filesystem? */ | |
2597 | if (nd.mnt->mnt_sb != sb) { | |
2598 | path_release(&nd); | |
2599 | return -EXDEV; | |
2600 | } | |
2601 | /* Quotafile not of fs root? */ | |
2602 | if (nd.dentry->d_parent->d_inode != sb->s_root->d_inode) | |
2603 | printk(KERN_WARNING | |
2604 | "EXT3-fs: Quota file not on filesystem root. " | |
2605 | "Journalled quota will not work.\n"); | |
2606 | path_release(&nd); | |
2607 | return vfs_quota_on(sb, type, format_id, path); | |
2608 | } | |
2609 | ||
2610 | /* Read data from quotafile - avoid pagecache and such because we cannot afford | |
2611 | * acquiring the locks... As quota files are never truncated and quota code | |
2612 | * itself serializes the operations (and noone else should touch the files) | |
2613 | * we don't have to be afraid of races */ | |
2614 | static ssize_t ext3_quota_read(struct super_block *sb, int type, char *data, | |
2615 | size_t len, loff_t off) | |
2616 | { | |
2617 | struct inode *inode = sb_dqopt(sb)->files[type]; | |
2618 | sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb); | |
2619 | int err = 0; | |
2620 | int offset = off & (sb->s_blocksize - 1); | |
2621 | int tocopy; | |
2622 | size_t toread; | |
2623 | struct buffer_head *bh; | |
2624 | loff_t i_size = i_size_read(inode); | |
2625 | ||
2626 | if (off > i_size) | |
2627 | return 0; | |
2628 | if (off+len > i_size) | |
2629 | len = i_size-off; | |
2630 | toread = len; | |
2631 | while (toread > 0) { | |
2632 | tocopy = sb->s_blocksize - offset < toread ? | |
2633 | sb->s_blocksize - offset : toread; | |
2634 | bh = ext3_bread(NULL, inode, blk, 0, &err); | |
2635 | if (err) | |
2636 | return err; | |
2637 | if (!bh) /* A hole? */ | |
2638 | memset(data, 0, tocopy); | |
2639 | else | |
2640 | memcpy(data, bh->b_data+offset, tocopy); | |
2641 | brelse(bh); | |
2642 | offset = 0; | |
2643 | toread -= tocopy; | |
2644 | data += tocopy; | |
2645 | blk++; | |
2646 | } | |
2647 | return len; | |
2648 | } | |
2649 | ||
2650 | /* Write to quotafile (we know the transaction is already started and has | |
2651 | * enough credits) */ | |
2652 | static ssize_t ext3_quota_write(struct super_block *sb, int type, | |
2653 | const char *data, size_t len, loff_t off) | |
2654 | { | |
2655 | struct inode *inode = sb_dqopt(sb)->files[type]; | |
2656 | sector_t blk = off >> EXT3_BLOCK_SIZE_BITS(sb); | |
2657 | int err = 0; | |
2658 | int offset = off & (sb->s_blocksize - 1); | |
2659 | int tocopy; | |
2660 | int journal_quota = EXT3_SB(sb)->s_qf_names[type] != NULL; | |
2661 | size_t towrite = len; | |
2662 | struct buffer_head *bh; | |
2663 | handle_t *handle = journal_current_handle(); | |
2664 | ||
5c81a419 | 2665 | mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA); |
1da177e4 LT |
2666 | while (towrite > 0) { |
2667 | tocopy = sb->s_blocksize - offset < towrite ? | |
2668 | sb->s_blocksize - offset : towrite; | |
2669 | bh = ext3_bread(handle, inode, blk, 1, &err); | |
2670 | if (!bh) | |
2671 | goto out; | |
2672 | if (journal_quota) { | |
2673 | err = ext3_journal_get_write_access(handle, bh); | |
2674 | if (err) { | |
2675 | brelse(bh); | |
2676 | goto out; | |
2677 | } | |
2678 | } | |
2679 | lock_buffer(bh); | |
2680 | memcpy(bh->b_data+offset, data, tocopy); | |
2681 | flush_dcache_page(bh->b_page); | |
2682 | unlock_buffer(bh); | |
2683 | if (journal_quota) | |
2684 | err = ext3_journal_dirty_metadata(handle, bh); | |
2685 | else { | |
2686 | /* Always do at least ordered writes for quotas */ | |
2687 | err = ext3_journal_dirty_data(handle, bh); | |
2688 | mark_buffer_dirty(bh); | |
2689 | } | |
2690 | brelse(bh); | |
2691 | if (err) | |
2692 | goto out; | |
2693 | offset = 0; | |
2694 | towrite -= tocopy; | |
2695 | data += tocopy; | |
2696 | blk++; | |
2697 | } | |
2698 | out: | |
2699 | if (len == towrite) | |
2700 | return err; | |
2701 | if (inode->i_size < off+len-towrite) { | |
2702 | i_size_write(inode, off+len-towrite); | |
2703 | EXT3_I(inode)->i_disksize = inode->i_size; | |
2704 | } | |
2705 | inode->i_version++; | |
2706 | inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
2707 | ext3_mark_inode_dirty(handle, inode); | |
1b1dcc1b | 2708 | mutex_unlock(&inode->i_mutex); |
1da177e4 LT |
2709 | return len - towrite; |
2710 | } | |
2711 | ||
2712 | #endif | |
2713 | ||
454e2398 DH |
2714 | static int ext3_get_sb(struct file_system_type *fs_type, |
2715 | int flags, const char *dev_name, void *data, struct vfsmount *mnt) | |
1da177e4 | 2716 | { |
454e2398 | 2717 | return get_sb_bdev(fs_type, flags, dev_name, data, ext3_fill_super, mnt); |
1da177e4 LT |
2718 | } |
2719 | ||
2720 | static struct file_system_type ext3_fs_type = { | |
2721 | .owner = THIS_MODULE, | |
2722 | .name = "ext3", | |
2723 | .get_sb = ext3_get_sb, | |
2724 | .kill_sb = kill_block_super, | |
2725 | .fs_flags = FS_REQUIRES_DEV, | |
2726 | }; | |
2727 | ||
2728 | static int __init init_ext3_fs(void) | |
2729 | { | |
2730 | int err = init_ext3_xattr(); | |
2731 | if (err) | |
2732 | return err; | |
2733 | err = init_inodecache(); | |
2734 | if (err) | |
2735 | goto out1; | |
2736 | err = register_filesystem(&ext3_fs_type); | |
2737 | if (err) | |
2738 | goto out; | |
2739 | return 0; | |
2740 | out: | |
2741 | destroy_inodecache(); | |
2742 | out1: | |
e9ad5620 | 2743 | exit_ext3_xattr(); |
1da177e4 LT |
2744 | return err; |
2745 | } | |
2746 | ||
2747 | static void __exit exit_ext3_fs(void) | |
2748 | { | |
2749 | unregister_filesystem(&ext3_fs_type); | |
2750 | destroy_inodecache(); | |
2751 | exit_ext3_xattr(); | |
2752 | } | |
2753 | ||
2754 | MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others"); | |
2755 | MODULE_DESCRIPTION("Second Extended Filesystem with journaling extensions"); | |
2756 | MODULE_LICENSE("GPL"); | |
2757 | module_init(init_ext3_fs) | |
2758 | module_exit(exit_ext3_fs) |