Commit | Line | Data |
---|---|---|
ac27a0ec | 1 | /* |
617ba13b | 2 | * linux/fs/ext4/super.c |
ac27a0ec DK |
3 | * |
4 | * Copyright (C) 1992, 1993, 1994, 1995 | |
5 | * Remy Card (card@masi.ibp.fr) | |
6 | * Laboratoire MASI - Institut Blaise Pascal | |
7 | * Universite Pierre et Marie Curie (Paris VI) | |
8 | * | |
9 | * from | |
10 | * | |
11 | * linux/fs/minix/inode.c | |
12 | * | |
13 | * Copyright (C) 1991, 1992 Linus Torvalds | |
14 | * | |
15 | * Big-endian to little-endian byte-swapping/bitmaps by | |
16 | * David S. Miller (davem@caip.rutgers.edu), 1995 | |
17 | */ | |
18 | ||
19 | #include <linux/module.h> | |
20 | #include <linux/string.h> | |
21 | #include <linux/fs.h> | |
22 | #include <linux/time.h> | |
23 | #include <linux/jbd.h> | |
617ba13b MC |
24 | #include <linux/ext4_fs.h> |
25 | #include <linux/ext4_jbd.h> | |
ac27a0ec DK |
26 | #include <linux/slab.h> |
27 | #include <linux/init.h> | |
28 | #include <linux/blkdev.h> | |
29 | #include <linux/parser.h> | |
30 | #include <linux/smp_lock.h> | |
31 | #include <linux/buffer_head.h> | |
32 | #include <linux/vfs.h> | |
33 | #include <linux/random.h> | |
34 | #include <linux/mount.h> | |
35 | #include <linux/namei.h> | |
36 | #include <linux/quotaops.h> | |
37 | #include <linux/seq_file.h> | |
38 | ||
39 | #include <asm/uaccess.h> | |
40 | ||
41 | #include "xattr.h" | |
42 | #include "acl.h" | |
43 | #include "namei.h" | |
44 | ||
617ba13b | 45 | static int ext4_load_journal(struct super_block *, struct ext4_super_block *, |
ac27a0ec | 46 | unsigned long journal_devnum); |
617ba13b | 47 | static int ext4_create_journal(struct super_block *, struct ext4_super_block *, |
ac27a0ec | 48 | unsigned int); |
617ba13b MC |
49 | static void ext4_commit_super (struct super_block * sb, |
50 | struct ext4_super_block * es, | |
ac27a0ec | 51 | int sync); |
617ba13b MC |
52 | static void ext4_mark_recovery_complete(struct super_block * sb, |
53 | struct ext4_super_block * es); | |
54 | static void ext4_clear_journal_err(struct super_block * sb, | |
55 | struct ext4_super_block * es); | |
56 | static int ext4_sync_fs(struct super_block *sb, int wait); | |
57 | static const char *ext4_decode_error(struct super_block * sb, int errno, | |
ac27a0ec | 58 | char nbuf[16]); |
617ba13b MC |
59 | static int ext4_remount (struct super_block * sb, int * flags, char * data); |
60 | static int ext4_statfs (struct dentry * dentry, struct kstatfs * buf); | |
61 | static void ext4_unlockfs(struct super_block *sb); | |
62 | static void ext4_write_super (struct super_block * sb); | |
63 | static void ext4_write_super_lockfs(struct super_block *sb); | |
ac27a0ec DK |
64 | |
65 | /* | |
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 | |
71 | * appropriate. | |
72 | */ | |
617ba13b | 73 | handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks) |
ac27a0ec DK |
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. */ | |
617ba13b | 83 | journal = EXT4_SB(sb)->s_journal; |
ac27a0ec | 84 | if (is_journal_aborted(journal)) { |
617ba13b | 85 | ext4_abort(sb, __FUNCTION__, |
ac27a0ec DK |
86 | "Detected aborted journal"); |
87 | return ERR_PTR(-EROFS); | |
88 | } | |
89 | ||
90 | return journal_start(journal, nblocks); | |
91 | } | |
92 | ||
93 | /* | |
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 | |
97 | * appropriate. | |
98 | */ | |
617ba13b | 99 | int __ext4_journal_stop(const char *where, handle_t *handle) |
ac27a0ec DK |
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) | |
617ba13b | 112 | __ext4_std_error(sb, where, err); |
ac27a0ec DK |
113 | return err; |
114 | } | |
115 | ||
617ba13b | 116 | void ext4_journal_abort_handle(const char *caller, const char *err_fn, |
ac27a0ec DK |
117 | struct buffer_head *bh, handle_t *handle, int err) |
118 | { | |
119 | char nbuf[16]; | |
617ba13b | 120 | const char *errstr = ext4_decode_error(NULL, err, nbuf); |
ac27a0ec DK |
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 | |
617ba13b | 141 | * superblock. That is not possible on ext4, because we may have other |
ac27a0ec DK |
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 | ||
617ba13b | 152 | static void ext4_handle_error(struct super_block *sb) |
ac27a0ec | 153 | { |
617ba13b | 154 | struct ext4_super_block *es = EXT4_SB(sb)->s_es; |
ac27a0ec | 155 | |
617ba13b MC |
156 | EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; |
157 | es->s_state |= cpu_to_le16(EXT4_ERROR_FS); | |
ac27a0ec DK |
158 | |
159 | if (sb->s_flags & MS_RDONLY) | |
160 | return; | |
161 | ||
162 | if (!test_opt (sb, ERRORS_CONT)) { | |
617ba13b | 163 | journal_t *journal = EXT4_SB(sb)->s_journal; |
ac27a0ec | 164 | |
617ba13b | 165 | EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT; |
ac27a0ec DK |
166 | if (journal) |
167 | journal_abort(journal, -EIO); | |
168 | } | |
169 | if (test_opt (sb, ERRORS_RO)) { | |
170 | printk (KERN_CRIT "Remounting filesystem read-only\n"); | |
171 | sb->s_flags |= MS_RDONLY; | |
172 | } | |
617ba13b | 173 | ext4_commit_super(sb, es, 1); |
ac27a0ec | 174 | if (test_opt(sb, ERRORS_PANIC)) |
617ba13b | 175 | panic("EXT4-fs (device %s): panic forced after error\n", |
ac27a0ec DK |
176 | sb->s_id); |
177 | } | |
178 | ||
617ba13b | 179 | void ext4_error (struct super_block * sb, const char * function, |
ac27a0ec DK |
180 | const char * fmt, ...) |
181 | { | |
182 | va_list args; | |
183 | ||
184 | va_start(args, fmt); | |
617ba13b | 185 | printk(KERN_CRIT "EXT4-fs error (device %s): %s: ",sb->s_id, function); |
ac27a0ec DK |
186 | vprintk(fmt, args); |
187 | printk("\n"); | |
188 | va_end(args); | |
189 | ||
617ba13b | 190 | ext4_handle_error(sb); |
ac27a0ec DK |
191 | } |
192 | ||
617ba13b | 193 | static const char *ext4_decode_error(struct super_block * sb, int errno, |
ac27a0ec DK |
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: | |
617ba13b | 206 | if (!sb || EXT4_SB(sb)->s_journal->j_flags & JFS_ABORT) |
ac27a0ec DK |
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 | ||
617ba13b | 226 | /* __ext4_std_error decodes expected errors from journaling functions |
ac27a0ec DK |
227 | * automatically and invokes the appropriate error response. */ |
228 | ||
617ba13b | 229 | void __ext4_std_error (struct super_block * sb, const char * function, |
ac27a0ec DK |
230 | int errno) |
231 | { | |
232 | char nbuf[16]; | |
233 | const char *errstr; | |
234 | ||
235 | /* Special case: if the error is EROFS, and we're not already | |
236 | * inside a transaction, then there's really no point in logging | |
237 | * an error. */ | |
238 | if (errno == -EROFS && journal_current_handle() == NULL && | |
239 | (sb->s_flags & MS_RDONLY)) | |
240 | return; | |
241 | ||
617ba13b MC |
242 | errstr = ext4_decode_error(sb, errno, nbuf); |
243 | printk (KERN_CRIT "EXT4-fs error (device %s) in %s: %s\n", | |
ac27a0ec DK |
244 | sb->s_id, function, errstr); |
245 | ||
617ba13b | 246 | ext4_handle_error(sb); |
ac27a0ec DK |
247 | } |
248 | ||
249 | /* | |
617ba13b | 250 | * ext4_abort is a much stronger failure handler than ext4_error. The |
ac27a0ec DK |
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 | ||
617ba13b | 259 | void ext4_abort (struct super_block * sb, const char * function, |
ac27a0ec DK |
260 | const char * fmt, ...) |
261 | { | |
262 | va_list args; | |
263 | ||
617ba13b | 264 | printk (KERN_CRIT "ext4_abort called.\n"); |
ac27a0ec DK |
265 | |
266 | va_start(args, fmt); | |
617ba13b | 267 | printk(KERN_CRIT "EXT4-fs error (device %s): %s: ",sb->s_id, function); |
ac27a0ec DK |
268 | vprintk(fmt, args); |
269 | printk("\n"); | |
270 | va_end(args); | |
271 | ||
272 | if (test_opt(sb, ERRORS_PANIC)) | |
617ba13b | 273 | panic("EXT4-fs panic from previous error\n"); |
ac27a0ec DK |
274 | |
275 | if (sb->s_flags & MS_RDONLY) | |
276 | return; | |
277 | ||
278 | printk(KERN_CRIT "Remounting filesystem read-only\n"); | |
617ba13b | 279 | EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; |
ac27a0ec | 280 | sb->s_flags |= MS_RDONLY; |
617ba13b MC |
281 | EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT; |
282 | journal_abort(EXT4_SB(sb)->s_journal, -EIO); | |
ac27a0ec DK |
283 | } |
284 | ||
617ba13b | 285 | void ext4_warning (struct super_block * sb, const char * function, |
ac27a0ec DK |
286 | const char * fmt, ...) |
287 | { | |
288 | va_list args; | |
289 | ||
290 | va_start(args, fmt); | |
617ba13b | 291 | printk(KERN_WARNING "EXT4-fs warning (device %s): %s: ", |
ac27a0ec DK |
292 | sb->s_id, function); |
293 | vprintk(fmt, args); | |
294 | printk("\n"); | |
295 | va_end(args); | |
296 | } | |
297 | ||
617ba13b | 298 | void ext4_update_dynamic_rev(struct super_block *sb) |
ac27a0ec | 299 | { |
617ba13b | 300 | struct ext4_super_block *es = EXT4_SB(sb)->s_es; |
ac27a0ec | 301 | |
617ba13b | 302 | if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV) |
ac27a0ec DK |
303 | return; |
304 | ||
617ba13b | 305 | ext4_warning(sb, __FUNCTION__, |
ac27a0ec DK |
306 | "updating to rev %d because of new feature flag, " |
307 | "running e2fsck is recommended", | |
617ba13b | 308 | EXT4_DYNAMIC_REV); |
ac27a0ec | 309 | |
617ba13b MC |
310 | es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO); |
311 | es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE); | |
312 | es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV); | |
ac27a0ec DK |
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 | */ | |
617ba13b | 326 | static struct block_device *ext4_blkdev_get(dev_t dev) |
ac27a0ec DK |
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: | |
617ba13b | 337 | printk(KERN_ERR "EXT4: failed to open journal device %s: %ld\n", |
ac27a0ec DK |
338 | __bdevname(dev, b), PTR_ERR(bdev)); |
339 | return NULL; | |
340 | } | |
341 | ||
342 | /* | |
343 | * Release the journal device | |
344 | */ | |
617ba13b | 345 | static int ext4_blkdev_put(struct block_device *bdev) |
ac27a0ec DK |
346 | { |
347 | bd_release(bdev); | |
348 | return blkdev_put(bdev); | |
349 | } | |
350 | ||
617ba13b | 351 | static int ext4_blkdev_remove(struct ext4_sb_info *sbi) |
ac27a0ec DK |
352 | { |
353 | struct block_device *bdev; | |
354 | int ret = -ENODEV; | |
355 | ||
356 | bdev = sbi->journal_bdev; | |
357 | if (bdev) { | |
617ba13b | 358 | ret = ext4_blkdev_put(bdev); |
ac27a0ec DK |
359 | sbi->journal_bdev = NULL; |
360 | } | |
361 | return ret; | |
362 | } | |
363 | ||
364 | static inline struct inode *orphan_list_entry(struct list_head *l) | |
365 | { | |
617ba13b | 366 | return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode; |
ac27a0ec DK |
367 | } |
368 | ||
617ba13b | 369 | static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi) |
ac27a0ec DK |
370 | { |
371 | struct list_head *l; | |
372 | ||
373 | printk(KERN_ERR "sb orphan head is %d\n", | |
374 | le32_to_cpu(sbi->s_es->s_last_orphan)); | |
375 | ||
376 | printk(KERN_ERR "sb_info orphan list:\n"); | |
377 | list_for_each(l, &sbi->s_orphan) { | |
378 | struct inode *inode = orphan_list_entry(l); | |
379 | printk(KERN_ERR " " | |
380 | "inode %s:%lu at %p: mode %o, nlink %d, next %d\n", | |
381 | inode->i_sb->s_id, inode->i_ino, inode, | |
382 | inode->i_mode, inode->i_nlink, | |
383 | NEXT_ORPHAN(inode)); | |
384 | } | |
385 | } | |
386 | ||
617ba13b | 387 | static void ext4_put_super (struct super_block * sb) |
ac27a0ec | 388 | { |
617ba13b MC |
389 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
390 | struct ext4_super_block *es = sbi->s_es; | |
ac27a0ec DK |
391 | int i; |
392 | ||
617ba13b | 393 | ext4_xattr_put_super(sb); |
ac27a0ec DK |
394 | journal_destroy(sbi->s_journal); |
395 | if (!(sb->s_flags & MS_RDONLY)) { | |
617ba13b | 396 | EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); |
ac27a0ec DK |
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); | |
617ba13b | 400 | ext4_commit_super(sb, es, 1); |
ac27a0ec DK |
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); | |
617ba13b | 432 | ext4_blkdev_remove(sbi); |
ac27a0ec DK |
433 | } |
434 | sb->s_fs_info = NULL; | |
435 | kfree(sbi); | |
436 | return; | |
437 | } | |
438 | ||
617ba13b | 439 | static kmem_cache_t *ext4_inode_cachep; |
ac27a0ec DK |
440 | |
441 | /* | |
442 | * Called inside transaction, so use GFP_NOFS | |
443 | */ | |
617ba13b | 444 | static struct inode *ext4_alloc_inode(struct super_block *sb) |
ac27a0ec | 445 | { |
617ba13b | 446 | struct ext4_inode_info *ei; |
ac27a0ec | 447 | |
617ba13b | 448 | ei = kmem_cache_alloc(ext4_inode_cachep, SLAB_NOFS); |
ac27a0ec DK |
449 | if (!ei) |
450 | return NULL; | |
617ba13b MC |
451 | #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL |
452 | ei->i_acl = EXT4_ACL_NOT_CACHED; | |
453 | ei->i_default_acl = EXT4_ACL_NOT_CACHED; | |
ac27a0ec DK |
454 | #endif |
455 | ei->i_block_alloc_info = NULL; | |
456 | ei->vfs_inode.i_version = 1; | |
457 | return &ei->vfs_inode; | |
458 | } | |
459 | ||
617ba13b | 460 | static void ext4_destroy_inode(struct inode *inode) |
ac27a0ec | 461 | { |
617ba13b | 462 | kmem_cache_free(ext4_inode_cachep, EXT4_I(inode)); |
ac27a0ec DK |
463 | } |
464 | ||
465 | static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags) | |
466 | { | |
617ba13b | 467 | struct ext4_inode_info *ei = (struct ext4_inode_info *) foo; |
ac27a0ec DK |
468 | |
469 | if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == | |
470 | SLAB_CTOR_CONSTRUCTOR) { | |
471 | INIT_LIST_HEAD(&ei->i_orphan); | |
617ba13b | 472 | #ifdef CONFIG_EXT4DEV_FS_XATTR |
ac27a0ec DK |
473 | init_rwsem(&ei->xattr_sem); |
474 | #endif | |
475 | mutex_init(&ei->truncate_mutex); | |
476 | inode_init_once(&ei->vfs_inode); | |
477 | } | |
478 | } | |
479 | ||
480 | static int init_inodecache(void) | |
481 | { | |
617ba13b MC |
482 | ext4_inode_cachep = kmem_cache_create("ext4_inode_cache", |
483 | sizeof(struct ext4_inode_info), | |
ac27a0ec DK |
484 | 0, (SLAB_RECLAIM_ACCOUNT| |
485 | SLAB_MEM_SPREAD), | |
486 | init_once, NULL); | |
617ba13b | 487 | if (ext4_inode_cachep == NULL) |
ac27a0ec DK |
488 | return -ENOMEM; |
489 | return 0; | |
490 | } | |
491 | ||
492 | static void destroy_inodecache(void) | |
493 | { | |
617ba13b | 494 | kmem_cache_destroy(ext4_inode_cachep); |
ac27a0ec DK |
495 | } |
496 | ||
617ba13b | 497 | static void ext4_clear_inode(struct inode *inode) |
ac27a0ec | 498 | { |
617ba13b MC |
499 | struct ext4_block_alloc_info *rsv = EXT4_I(inode)->i_block_alloc_info; |
500 | #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL | |
501 | if (EXT4_I(inode)->i_acl && | |
502 | EXT4_I(inode)->i_acl != EXT4_ACL_NOT_CACHED) { | |
503 | posix_acl_release(EXT4_I(inode)->i_acl); | |
504 | EXT4_I(inode)->i_acl = EXT4_ACL_NOT_CACHED; | |
505 | } | |
506 | if (EXT4_I(inode)->i_default_acl && | |
507 | EXT4_I(inode)->i_default_acl != EXT4_ACL_NOT_CACHED) { | |
508 | posix_acl_release(EXT4_I(inode)->i_default_acl); | |
509 | EXT4_I(inode)->i_default_acl = EXT4_ACL_NOT_CACHED; | |
ac27a0ec DK |
510 | } |
511 | #endif | |
617ba13b MC |
512 | ext4_discard_reservation(inode); |
513 | EXT4_I(inode)->i_block_alloc_info = NULL; | |
ac27a0ec DK |
514 | if (unlikely(rsv)) |
515 | kfree(rsv); | |
516 | } | |
517 | ||
617ba13b | 518 | static inline void ext4_show_quota_options(struct seq_file *seq, struct super_block *sb) |
ac27a0ec DK |
519 | { |
520 | #if defined(CONFIG_QUOTA) | |
617ba13b | 521 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
ac27a0ec DK |
522 | |
523 | if (sbi->s_jquota_fmt) | |
524 | seq_printf(seq, ",jqfmt=%s", | |
525 | (sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold": "vfsv0"); | |
526 | ||
527 | if (sbi->s_qf_names[USRQUOTA]) | |
528 | seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]); | |
529 | ||
530 | if (sbi->s_qf_names[GRPQUOTA]) | |
531 | seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]); | |
532 | ||
617ba13b | 533 | if (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA) |
ac27a0ec DK |
534 | seq_puts(seq, ",usrquota"); |
535 | ||
617ba13b | 536 | if (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA) |
ac27a0ec DK |
537 | seq_puts(seq, ",grpquota"); |
538 | #endif | |
539 | } | |
540 | ||
617ba13b | 541 | static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs) |
ac27a0ec DK |
542 | { |
543 | struct super_block *sb = vfs->mnt_sb; | |
544 | ||
617ba13b | 545 | if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) |
ac27a0ec | 546 | seq_puts(seq, ",data=journal"); |
617ba13b | 547 | else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) |
ac27a0ec | 548 | seq_puts(seq, ",data=ordered"); |
617ba13b | 549 | else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA) |
ac27a0ec DK |
550 | seq_puts(seq, ",data=writeback"); |
551 | ||
617ba13b | 552 | ext4_show_quota_options(seq, sb); |
ac27a0ec DK |
553 | |
554 | return 0; | |
555 | } | |
556 | ||
557 | ||
617ba13b | 558 | static struct dentry *ext4_get_dentry(struct super_block *sb, void *vobjp) |
ac27a0ec DK |
559 | { |
560 | __u32 *objp = vobjp; | |
561 | unsigned long ino = objp[0]; | |
562 | __u32 generation = objp[1]; | |
563 | struct inode *inode; | |
564 | struct dentry *result; | |
565 | ||
617ba13b | 566 | if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO) |
ac27a0ec | 567 | return ERR_PTR(-ESTALE); |
617ba13b | 568 | if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)) |
ac27a0ec DK |
569 | return ERR_PTR(-ESTALE); |
570 | ||
571 | /* iget isn't really right if the inode is currently unallocated!! | |
572 | * | |
617ba13b | 573 | * ext4_read_inode will return a bad_inode if the inode had been |
ac27a0ec DK |
574 | * deleted, so we should be safe. |
575 | * | |
576 | * Currently we don't know the generation for parent directory, so | |
577 | * a generation of 0 means "accept any" | |
578 | */ | |
579 | inode = iget(sb, ino); | |
580 | if (inode == NULL) | |
581 | return ERR_PTR(-ENOMEM); | |
582 | if (is_bad_inode(inode) || | |
583 | (generation && inode->i_generation != generation)) { | |
584 | iput(inode); | |
585 | return ERR_PTR(-ESTALE); | |
586 | } | |
587 | /* now to find a dentry. | |
588 | * If possible, get a well-connected one | |
589 | */ | |
590 | result = d_alloc_anon(inode); | |
591 | if (!result) { | |
592 | iput(inode); | |
593 | return ERR_PTR(-ENOMEM); | |
594 | } | |
595 | return result; | |
596 | } | |
597 | ||
598 | #ifdef CONFIG_QUOTA | |
599 | #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group") | |
600 | #define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA)) | |
601 | ||
617ba13b MC |
602 | static int ext4_dquot_initialize(struct inode *inode, int type); |
603 | static int ext4_dquot_drop(struct inode *inode); | |
604 | static int ext4_write_dquot(struct dquot *dquot); | |
605 | static int ext4_acquire_dquot(struct dquot *dquot); | |
606 | static int ext4_release_dquot(struct dquot *dquot); | |
607 | static int ext4_mark_dquot_dirty(struct dquot *dquot); | |
608 | static int ext4_write_info(struct super_block *sb, int type); | |
609 | static int ext4_quota_on(struct super_block *sb, int type, int format_id, char *path); | |
610 | static int ext4_quota_on_mount(struct super_block *sb, int type); | |
611 | static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data, | |
ac27a0ec | 612 | size_t len, loff_t off); |
617ba13b | 613 | static ssize_t ext4_quota_write(struct super_block *sb, int type, |
ac27a0ec DK |
614 | const char *data, size_t len, loff_t off); |
615 | ||
617ba13b MC |
616 | static struct dquot_operations ext4_quota_operations = { |
617 | .initialize = ext4_dquot_initialize, | |
618 | .drop = ext4_dquot_drop, | |
ac27a0ec DK |
619 | .alloc_space = dquot_alloc_space, |
620 | .alloc_inode = dquot_alloc_inode, | |
621 | .free_space = dquot_free_space, | |
622 | .free_inode = dquot_free_inode, | |
623 | .transfer = dquot_transfer, | |
617ba13b MC |
624 | .write_dquot = ext4_write_dquot, |
625 | .acquire_dquot = ext4_acquire_dquot, | |
626 | .release_dquot = ext4_release_dquot, | |
627 | .mark_dirty = ext4_mark_dquot_dirty, | |
628 | .write_info = ext4_write_info | |
ac27a0ec DK |
629 | }; |
630 | ||
617ba13b MC |
631 | static struct quotactl_ops ext4_qctl_operations = { |
632 | .quota_on = ext4_quota_on, | |
ac27a0ec DK |
633 | .quota_off = vfs_quota_off, |
634 | .quota_sync = vfs_quota_sync, | |
635 | .get_info = vfs_get_dqinfo, | |
636 | .set_info = vfs_set_dqinfo, | |
637 | .get_dqblk = vfs_get_dqblk, | |
638 | .set_dqblk = vfs_set_dqblk | |
639 | }; | |
640 | #endif | |
641 | ||
617ba13b MC |
642 | static struct super_operations ext4_sops = { |
643 | .alloc_inode = ext4_alloc_inode, | |
644 | .destroy_inode = ext4_destroy_inode, | |
645 | .read_inode = ext4_read_inode, | |
646 | .write_inode = ext4_write_inode, | |
647 | .dirty_inode = ext4_dirty_inode, | |
648 | .delete_inode = ext4_delete_inode, | |
649 | .put_super = ext4_put_super, | |
650 | .write_super = ext4_write_super, | |
651 | .sync_fs = ext4_sync_fs, | |
652 | .write_super_lockfs = ext4_write_super_lockfs, | |
653 | .unlockfs = ext4_unlockfs, | |
654 | .statfs = ext4_statfs, | |
655 | .remount_fs = ext4_remount, | |
656 | .clear_inode = ext4_clear_inode, | |
657 | .show_options = ext4_show_options, | |
ac27a0ec | 658 | #ifdef CONFIG_QUOTA |
617ba13b MC |
659 | .quota_read = ext4_quota_read, |
660 | .quota_write = ext4_quota_write, | |
ac27a0ec DK |
661 | #endif |
662 | }; | |
663 | ||
617ba13b MC |
664 | static struct export_operations ext4_export_ops = { |
665 | .get_parent = ext4_get_parent, | |
666 | .get_dentry = ext4_get_dentry, | |
ac27a0ec DK |
667 | }; |
668 | ||
669 | enum { | |
670 | Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid, | |
671 | Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro, | |
672 | Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov, | |
673 | Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl, | |
674 | Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh, | |
675 | Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev, | |
676 | Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback, | |
677 | Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota, | |
678 | Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota, | |
679 | Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota, | |
680 | Opt_grpquota | |
681 | }; | |
682 | ||
683 | static match_table_t tokens = { | |
684 | {Opt_bsd_df, "bsddf"}, | |
685 | {Opt_minix_df, "minixdf"}, | |
686 | {Opt_grpid, "grpid"}, | |
687 | {Opt_grpid, "bsdgroups"}, | |
688 | {Opt_nogrpid, "nogrpid"}, | |
689 | {Opt_nogrpid, "sysvgroups"}, | |
690 | {Opt_resgid, "resgid=%u"}, | |
691 | {Opt_resuid, "resuid=%u"}, | |
692 | {Opt_sb, "sb=%u"}, | |
693 | {Opt_err_cont, "errors=continue"}, | |
694 | {Opt_err_panic, "errors=panic"}, | |
695 | {Opt_err_ro, "errors=remount-ro"}, | |
696 | {Opt_nouid32, "nouid32"}, | |
697 | {Opt_nocheck, "nocheck"}, | |
698 | {Opt_nocheck, "check=none"}, | |
699 | {Opt_debug, "debug"}, | |
700 | {Opt_oldalloc, "oldalloc"}, | |
701 | {Opt_orlov, "orlov"}, | |
702 | {Opt_user_xattr, "user_xattr"}, | |
703 | {Opt_nouser_xattr, "nouser_xattr"}, | |
704 | {Opt_acl, "acl"}, | |
705 | {Opt_noacl, "noacl"}, | |
706 | {Opt_reservation, "reservation"}, | |
707 | {Opt_noreservation, "noreservation"}, | |
708 | {Opt_noload, "noload"}, | |
709 | {Opt_nobh, "nobh"}, | |
710 | {Opt_bh, "bh"}, | |
711 | {Opt_commit, "commit=%u"}, | |
712 | {Opt_journal_update, "journal=update"}, | |
713 | {Opt_journal_inum, "journal=%u"}, | |
714 | {Opt_journal_dev, "journal_dev=%u"}, | |
715 | {Opt_abort, "abort"}, | |
716 | {Opt_data_journal, "data=journal"}, | |
717 | {Opt_data_ordered, "data=ordered"}, | |
718 | {Opt_data_writeback, "data=writeback"}, | |
719 | {Opt_offusrjquota, "usrjquota="}, | |
720 | {Opt_usrjquota, "usrjquota=%s"}, | |
721 | {Opt_offgrpjquota, "grpjquota="}, | |
722 | {Opt_grpjquota, "grpjquota=%s"}, | |
723 | {Opt_jqfmt_vfsold, "jqfmt=vfsold"}, | |
724 | {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"}, | |
725 | {Opt_grpquota, "grpquota"}, | |
726 | {Opt_noquota, "noquota"}, | |
727 | {Opt_quota, "quota"}, | |
728 | {Opt_usrquota, "usrquota"}, | |
729 | {Opt_barrier, "barrier=%u"}, | |
730 | {Opt_err, NULL}, | |
731 | {Opt_resize, "resize"}, | |
732 | }; | |
733 | ||
617ba13b | 734 | static ext4_fsblk_t get_sb_block(void **data) |
ac27a0ec | 735 | { |
617ba13b | 736 | ext4_fsblk_t sb_block; |
ac27a0ec DK |
737 | char *options = (char *) *data; |
738 | ||
739 | if (!options || strncmp(options, "sb=", 3) != 0) | |
740 | return 1; /* Default location */ | |
741 | options += 3; | |
617ba13b | 742 | /*todo: use simple_strtoll with >32bit ext4 */ |
ac27a0ec DK |
743 | sb_block = simple_strtoul(options, &options, 0); |
744 | if (*options && *options != ',') { | |
617ba13b | 745 | printk("EXT4-fs: Invalid sb specification: %s\n", |
ac27a0ec DK |
746 | (char *) *data); |
747 | return 1; | |
748 | } | |
749 | if (*options == ',') | |
750 | options++; | |
751 | *data = (void *) options; | |
752 | return sb_block; | |
753 | } | |
754 | ||
755 | static int parse_options (char *options, struct super_block *sb, | |
756 | unsigned int *inum, unsigned long *journal_devnum, | |
617ba13b | 757 | ext4_fsblk_t *n_blocks_count, int is_remount) |
ac27a0ec | 758 | { |
617ba13b | 759 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
ac27a0ec DK |
760 | char * p; |
761 | substring_t args[MAX_OPT_ARGS]; | |
762 | int data_opt = 0; | |
763 | int option; | |
764 | #ifdef CONFIG_QUOTA | |
765 | int qtype; | |
766 | char *qname; | |
767 | #endif | |
768 | ||
769 | if (!options) | |
770 | return 1; | |
771 | ||
772 | while ((p = strsep (&options, ",")) != NULL) { | |
773 | int token; | |
774 | if (!*p) | |
775 | continue; | |
776 | ||
777 | token = match_token(p, tokens, args); | |
778 | switch (token) { | |
779 | case Opt_bsd_df: | |
780 | clear_opt (sbi->s_mount_opt, MINIX_DF); | |
781 | break; | |
782 | case Opt_minix_df: | |
783 | set_opt (sbi->s_mount_opt, MINIX_DF); | |
784 | break; | |
785 | case Opt_grpid: | |
786 | set_opt (sbi->s_mount_opt, GRPID); | |
787 | break; | |
788 | case Opt_nogrpid: | |
789 | clear_opt (sbi->s_mount_opt, GRPID); | |
790 | break; | |
791 | case Opt_resuid: | |
792 | if (match_int(&args[0], &option)) | |
793 | return 0; | |
794 | sbi->s_resuid = option; | |
795 | break; | |
796 | case Opt_resgid: | |
797 | if (match_int(&args[0], &option)) | |
798 | return 0; | |
799 | sbi->s_resgid = option; | |
800 | break; | |
801 | case Opt_sb: | |
802 | /* handled by get_sb_block() instead of here */ | |
803 | /* *sb_block = match_int(&args[0]); */ | |
804 | break; | |
805 | case Opt_err_panic: | |
806 | clear_opt (sbi->s_mount_opt, ERRORS_CONT); | |
807 | clear_opt (sbi->s_mount_opt, ERRORS_RO); | |
808 | set_opt (sbi->s_mount_opt, ERRORS_PANIC); | |
809 | break; | |
810 | case Opt_err_ro: | |
811 | clear_opt (sbi->s_mount_opt, ERRORS_CONT); | |
812 | clear_opt (sbi->s_mount_opt, ERRORS_PANIC); | |
813 | set_opt (sbi->s_mount_opt, ERRORS_RO); | |
814 | break; | |
815 | case Opt_err_cont: | |
816 | clear_opt (sbi->s_mount_opt, ERRORS_RO); | |
817 | clear_opt (sbi->s_mount_opt, ERRORS_PANIC); | |
818 | set_opt (sbi->s_mount_opt, ERRORS_CONT); | |
819 | break; | |
820 | case Opt_nouid32: | |
821 | set_opt (sbi->s_mount_opt, NO_UID32); | |
822 | break; | |
823 | case Opt_nocheck: | |
824 | clear_opt (sbi->s_mount_opt, CHECK); | |
825 | break; | |
826 | case Opt_debug: | |
827 | set_opt (sbi->s_mount_opt, DEBUG); | |
828 | break; | |
829 | case Opt_oldalloc: | |
830 | set_opt (sbi->s_mount_opt, OLDALLOC); | |
831 | break; | |
832 | case Opt_orlov: | |
833 | clear_opt (sbi->s_mount_opt, OLDALLOC); | |
834 | break; | |
617ba13b | 835 | #ifdef CONFIG_EXT4DEV_FS_XATTR |
ac27a0ec DK |
836 | case Opt_user_xattr: |
837 | set_opt (sbi->s_mount_opt, XATTR_USER); | |
838 | break; | |
839 | case Opt_nouser_xattr: | |
840 | clear_opt (sbi->s_mount_opt, XATTR_USER); | |
841 | break; | |
842 | #else | |
843 | case Opt_user_xattr: | |
844 | case Opt_nouser_xattr: | |
617ba13b | 845 | printk("EXT4 (no)user_xattr options not supported\n"); |
ac27a0ec DK |
846 | break; |
847 | #endif | |
617ba13b | 848 | #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL |
ac27a0ec DK |
849 | case Opt_acl: |
850 | set_opt(sbi->s_mount_opt, POSIX_ACL); | |
851 | break; | |
852 | case Opt_noacl: | |
853 | clear_opt(sbi->s_mount_opt, POSIX_ACL); | |
854 | break; | |
855 | #else | |
856 | case Opt_acl: | |
857 | case Opt_noacl: | |
617ba13b | 858 | printk("EXT4 (no)acl options not supported\n"); |
ac27a0ec DK |
859 | break; |
860 | #endif | |
861 | case Opt_reservation: | |
862 | set_opt(sbi->s_mount_opt, RESERVATION); | |
863 | break; | |
864 | case Opt_noreservation: | |
865 | clear_opt(sbi->s_mount_opt, RESERVATION); | |
866 | break; | |
867 | case Opt_journal_update: | |
868 | /* @@@ FIXME */ | |
869 | /* Eventually we will want to be able to create | |
870 | a journal file here. For now, only allow the | |
871 | user to specify an existing inode to be the | |
872 | journal file. */ | |
873 | if (is_remount) { | |
617ba13b | 874 | printk(KERN_ERR "EXT4-fs: cannot specify " |
ac27a0ec DK |
875 | "journal on remount\n"); |
876 | return 0; | |
877 | } | |
878 | set_opt (sbi->s_mount_opt, UPDATE_JOURNAL); | |
879 | break; | |
880 | case Opt_journal_inum: | |
881 | if (is_remount) { | |
617ba13b | 882 | printk(KERN_ERR "EXT4-fs: cannot specify " |
ac27a0ec DK |
883 | "journal on remount\n"); |
884 | return 0; | |
885 | } | |
886 | if (match_int(&args[0], &option)) | |
887 | return 0; | |
888 | *inum = option; | |
889 | break; | |
890 | case Opt_journal_dev: | |
891 | if (is_remount) { | |
617ba13b | 892 | printk(KERN_ERR "EXT4-fs: cannot specify " |
ac27a0ec DK |
893 | "journal on remount\n"); |
894 | return 0; | |
895 | } | |
896 | if (match_int(&args[0], &option)) | |
897 | return 0; | |
898 | *journal_devnum = option; | |
899 | break; | |
900 | case Opt_noload: | |
901 | set_opt (sbi->s_mount_opt, NOLOAD); | |
902 | break; | |
903 | case Opt_commit: | |
904 | if (match_int(&args[0], &option)) | |
905 | return 0; | |
906 | if (option < 0) | |
907 | return 0; | |
908 | if (option == 0) | |
909 | option = JBD_DEFAULT_MAX_COMMIT_AGE; | |
910 | sbi->s_commit_interval = HZ * option; | |
911 | break; | |
912 | case Opt_data_journal: | |
617ba13b | 913 | data_opt = EXT4_MOUNT_JOURNAL_DATA; |
ac27a0ec DK |
914 | goto datacheck; |
915 | case Opt_data_ordered: | |
617ba13b | 916 | data_opt = EXT4_MOUNT_ORDERED_DATA; |
ac27a0ec DK |
917 | goto datacheck; |
918 | case Opt_data_writeback: | |
617ba13b | 919 | data_opt = EXT4_MOUNT_WRITEBACK_DATA; |
ac27a0ec DK |
920 | datacheck: |
921 | if (is_remount) { | |
617ba13b | 922 | if ((sbi->s_mount_opt & EXT4_MOUNT_DATA_FLAGS) |
ac27a0ec DK |
923 | != data_opt) { |
924 | printk(KERN_ERR | |
617ba13b | 925 | "EXT4-fs: cannot change data " |
ac27a0ec DK |
926 | "mode on remount\n"); |
927 | return 0; | |
928 | } | |
929 | } else { | |
617ba13b | 930 | sbi->s_mount_opt &= ~EXT4_MOUNT_DATA_FLAGS; |
ac27a0ec DK |
931 | sbi->s_mount_opt |= data_opt; |
932 | } | |
933 | break; | |
934 | #ifdef CONFIG_QUOTA | |
935 | case Opt_usrjquota: | |
936 | qtype = USRQUOTA; | |
937 | goto set_qf_name; | |
938 | case Opt_grpjquota: | |
939 | qtype = GRPQUOTA; | |
940 | set_qf_name: | |
941 | if (sb_any_quota_enabled(sb)) { | |
942 | printk(KERN_ERR | |
617ba13b | 943 | "EXT4-fs: Cannot change journalled " |
ac27a0ec DK |
944 | "quota options when quota turned on.\n"); |
945 | return 0; | |
946 | } | |
947 | qname = match_strdup(&args[0]); | |
948 | if (!qname) { | |
949 | printk(KERN_ERR | |
617ba13b | 950 | "EXT4-fs: not enough memory for " |
ac27a0ec DK |
951 | "storing quotafile name.\n"); |
952 | return 0; | |
953 | } | |
954 | if (sbi->s_qf_names[qtype] && | |
955 | strcmp(sbi->s_qf_names[qtype], qname)) { | |
956 | printk(KERN_ERR | |
617ba13b | 957 | "EXT4-fs: %s quota file already " |
ac27a0ec DK |
958 | "specified.\n", QTYPE2NAME(qtype)); |
959 | kfree(qname); | |
960 | return 0; | |
961 | } | |
962 | sbi->s_qf_names[qtype] = qname; | |
963 | if (strchr(sbi->s_qf_names[qtype], '/')) { | |
964 | printk(KERN_ERR | |
617ba13b | 965 | "EXT4-fs: quotafile must be on " |
ac27a0ec DK |
966 | "filesystem root.\n"); |
967 | kfree(sbi->s_qf_names[qtype]); | |
968 | sbi->s_qf_names[qtype] = NULL; | |
969 | return 0; | |
970 | } | |
971 | set_opt(sbi->s_mount_opt, QUOTA); | |
972 | break; | |
973 | case Opt_offusrjquota: | |
974 | qtype = USRQUOTA; | |
975 | goto clear_qf_name; | |
976 | case Opt_offgrpjquota: | |
977 | qtype = GRPQUOTA; | |
978 | clear_qf_name: | |
979 | if (sb_any_quota_enabled(sb)) { | |
617ba13b | 980 | printk(KERN_ERR "EXT4-fs: Cannot change " |
ac27a0ec DK |
981 | "journalled quota options when " |
982 | "quota turned on.\n"); | |
983 | return 0; | |
984 | } | |
985 | /* | |
986 | * The space will be released later when all options | |
987 | * are confirmed to be correct | |
988 | */ | |
989 | sbi->s_qf_names[qtype] = NULL; | |
990 | break; | |
991 | case Opt_jqfmt_vfsold: | |
992 | sbi->s_jquota_fmt = QFMT_VFS_OLD; | |
993 | break; | |
994 | case Opt_jqfmt_vfsv0: | |
995 | sbi->s_jquota_fmt = QFMT_VFS_V0; | |
996 | break; | |
997 | case Opt_quota: | |
998 | case Opt_usrquota: | |
999 | set_opt(sbi->s_mount_opt, QUOTA); | |
1000 | set_opt(sbi->s_mount_opt, USRQUOTA); | |
1001 | break; | |
1002 | case Opt_grpquota: | |
1003 | set_opt(sbi->s_mount_opt, QUOTA); | |
1004 | set_opt(sbi->s_mount_opt, GRPQUOTA); | |
1005 | break; | |
1006 | case Opt_noquota: | |
1007 | if (sb_any_quota_enabled(sb)) { | |
617ba13b | 1008 | printk(KERN_ERR "EXT4-fs: Cannot change quota " |
ac27a0ec DK |
1009 | "options when quota turned on.\n"); |
1010 | return 0; | |
1011 | } | |
1012 | clear_opt(sbi->s_mount_opt, QUOTA); | |
1013 | clear_opt(sbi->s_mount_opt, USRQUOTA); | |
1014 | clear_opt(sbi->s_mount_opt, GRPQUOTA); | |
1015 | break; | |
1016 | #else | |
1017 | case Opt_quota: | |
1018 | case Opt_usrquota: | |
1019 | case Opt_grpquota: | |
1020 | case Opt_usrjquota: | |
1021 | case Opt_grpjquota: | |
1022 | case Opt_offusrjquota: | |
1023 | case Opt_offgrpjquota: | |
1024 | case Opt_jqfmt_vfsold: | |
1025 | case Opt_jqfmt_vfsv0: | |
1026 | printk(KERN_ERR | |
617ba13b | 1027 | "EXT4-fs: journalled quota options not " |
ac27a0ec DK |
1028 | "supported.\n"); |
1029 | break; | |
1030 | case Opt_noquota: | |
1031 | break; | |
1032 | #endif | |
1033 | case Opt_abort: | |
1034 | set_opt(sbi->s_mount_opt, ABORT); | |
1035 | break; | |
1036 | case Opt_barrier: | |
1037 | if (match_int(&args[0], &option)) | |
1038 | return 0; | |
1039 | if (option) | |
1040 | set_opt(sbi->s_mount_opt, BARRIER); | |
1041 | else | |
1042 | clear_opt(sbi->s_mount_opt, BARRIER); | |
1043 | break; | |
1044 | case Opt_ignore: | |
1045 | break; | |
1046 | case Opt_resize: | |
1047 | if (!is_remount) { | |
617ba13b | 1048 | printk("EXT4-fs: resize option only available " |
ac27a0ec DK |
1049 | "for remount\n"); |
1050 | return 0; | |
1051 | } | |
1052 | if (match_int(&args[0], &option) != 0) | |
1053 | return 0; | |
1054 | *n_blocks_count = option; | |
1055 | break; | |
1056 | case Opt_nobh: | |
1057 | set_opt(sbi->s_mount_opt, NOBH); | |
1058 | break; | |
1059 | case Opt_bh: | |
1060 | clear_opt(sbi->s_mount_opt, NOBH); | |
1061 | break; | |
1062 | default: | |
1063 | printk (KERN_ERR | |
617ba13b | 1064 | "EXT4-fs: Unrecognized mount option \"%s\" " |
ac27a0ec DK |
1065 | "or missing value\n", p); |
1066 | return 0; | |
1067 | } | |
1068 | } | |
1069 | #ifdef CONFIG_QUOTA | |
1070 | if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) { | |
617ba13b | 1071 | if ((sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA) && |
ac27a0ec DK |
1072 | sbi->s_qf_names[USRQUOTA]) |
1073 | clear_opt(sbi->s_mount_opt, USRQUOTA); | |
1074 | ||
617ba13b | 1075 | if ((sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA) && |
ac27a0ec DK |
1076 | sbi->s_qf_names[GRPQUOTA]) |
1077 | clear_opt(sbi->s_mount_opt, GRPQUOTA); | |
1078 | ||
1079 | if ((sbi->s_qf_names[USRQUOTA] && | |
617ba13b | 1080 | (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)) || |
ac27a0ec | 1081 | (sbi->s_qf_names[GRPQUOTA] && |
617ba13b MC |
1082 | (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA))) { |
1083 | printk(KERN_ERR "EXT4-fs: old and new quota " | |
ac27a0ec DK |
1084 | "format mixing.\n"); |
1085 | return 0; | |
1086 | } | |
1087 | ||
1088 | if (!sbi->s_jquota_fmt) { | |
617ba13b | 1089 | printk(KERN_ERR "EXT4-fs: journalled quota format " |
ac27a0ec DK |
1090 | "not specified.\n"); |
1091 | return 0; | |
1092 | } | |
1093 | } else { | |
1094 | if (sbi->s_jquota_fmt) { | |
617ba13b | 1095 | printk(KERN_ERR "EXT4-fs: journalled quota format " |
ac27a0ec DK |
1096 | "specified with no journalling " |
1097 | "enabled.\n"); | |
1098 | return 0; | |
1099 | } | |
1100 | } | |
1101 | #endif | |
1102 | return 1; | |
1103 | } | |
1104 | ||
617ba13b | 1105 | static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es, |
ac27a0ec DK |
1106 | int read_only) |
1107 | { | |
617ba13b | 1108 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
ac27a0ec DK |
1109 | int res = 0; |
1110 | ||
617ba13b MC |
1111 | if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) { |
1112 | printk (KERN_ERR "EXT4-fs warning: revision level too high, " | |
ac27a0ec DK |
1113 | "forcing read-only mode\n"); |
1114 | res = MS_RDONLY; | |
1115 | } | |
1116 | if (read_only) | |
1117 | return res; | |
617ba13b MC |
1118 | if (!(sbi->s_mount_state & EXT4_VALID_FS)) |
1119 | printk (KERN_WARNING "EXT4-fs warning: mounting unchecked fs, " | |
ac27a0ec | 1120 | "running e2fsck is recommended\n"); |
617ba13b | 1121 | else if ((sbi->s_mount_state & EXT4_ERROR_FS)) |
ac27a0ec | 1122 | printk (KERN_WARNING |
617ba13b | 1123 | "EXT4-fs warning: mounting fs with errors, " |
ac27a0ec DK |
1124 | "running e2fsck is recommended\n"); |
1125 | else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 && | |
1126 | le16_to_cpu(es->s_mnt_count) >= | |
1127 | (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count)) | |
1128 | printk (KERN_WARNING | |
617ba13b | 1129 | "EXT4-fs warning: maximal mount count reached, " |
ac27a0ec DK |
1130 | "running e2fsck is recommended\n"); |
1131 | else if (le32_to_cpu(es->s_checkinterval) && | |
1132 | (le32_to_cpu(es->s_lastcheck) + | |
1133 | le32_to_cpu(es->s_checkinterval) <= get_seconds())) | |
1134 | printk (KERN_WARNING | |
617ba13b | 1135 | "EXT4-fs warning: checktime reached, " |
ac27a0ec DK |
1136 | "running e2fsck is recommended\n"); |
1137 | #if 0 | |
1138 | /* @@@ We _will_ want to clear the valid bit if we find | |
1139 | inconsistencies, to force a fsck at reboot. But for | |
1140 | a plain journaled filesystem we can keep it set as | |
1141 | valid forever! :) */ | |
617ba13b | 1142 | es->s_state = cpu_to_le16(le16_to_cpu(es->s_state) & ~EXT4_VALID_FS); |
ac27a0ec DK |
1143 | #endif |
1144 | if (!(__s16) le16_to_cpu(es->s_max_mnt_count)) | |
617ba13b | 1145 | es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT); |
ac27a0ec DK |
1146 | es->s_mnt_count=cpu_to_le16(le16_to_cpu(es->s_mnt_count) + 1); |
1147 | es->s_mtime = cpu_to_le32(get_seconds()); | |
617ba13b MC |
1148 | ext4_update_dynamic_rev(sb); |
1149 | EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); | |
ac27a0ec | 1150 | |
617ba13b | 1151 | ext4_commit_super(sb, es, 1); |
ac27a0ec | 1152 | if (test_opt(sb, DEBUG)) |
617ba13b | 1153 | printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%lu, " |
ac27a0ec DK |
1154 | "bpg=%lu, ipg=%lu, mo=%04lx]\n", |
1155 | sb->s_blocksize, | |
1156 | sbi->s_groups_count, | |
617ba13b MC |
1157 | EXT4_BLOCKS_PER_GROUP(sb), |
1158 | EXT4_INODES_PER_GROUP(sb), | |
ac27a0ec DK |
1159 | sbi->s_mount_opt); |
1160 | ||
617ba13b MC |
1161 | printk(KERN_INFO "EXT4 FS on %s, ", sb->s_id); |
1162 | if (EXT4_SB(sb)->s_journal->j_inode == NULL) { | |
ac27a0ec DK |
1163 | char b[BDEVNAME_SIZE]; |
1164 | ||
1165 | printk("external journal on %s\n", | |
617ba13b | 1166 | bdevname(EXT4_SB(sb)->s_journal->j_dev, b)); |
ac27a0ec DK |
1167 | } else { |
1168 | printk("internal journal\n"); | |
1169 | } | |
1170 | return res; | |
1171 | } | |
1172 | ||
1173 | /* Called at mount-time, super-block is locked */ | |
617ba13b | 1174 | static int ext4_check_descriptors (struct super_block * sb) |
ac27a0ec | 1175 | { |
617ba13b MC |
1176 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
1177 | ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block); | |
1178 | ext4_fsblk_t last_block; | |
1179 | struct ext4_group_desc * gdp = NULL; | |
ac27a0ec DK |
1180 | int desc_block = 0; |
1181 | int i; | |
1182 | ||
617ba13b | 1183 | ext4_debug ("Checking group descriptors"); |
ac27a0ec DK |
1184 | |
1185 | for (i = 0; i < sbi->s_groups_count; i++) | |
1186 | { | |
1187 | if (i == sbi->s_groups_count - 1) | |
1188 | last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1; | |
1189 | else | |
1190 | last_block = first_block + | |
617ba13b | 1191 | (EXT4_BLOCKS_PER_GROUP(sb) - 1); |
ac27a0ec | 1192 | |
617ba13b MC |
1193 | if ((i % EXT4_DESC_PER_BLOCK(sb)) == 0) |
1194 | gdp = (struct ext4_group_desc *) | |
ac27a0ec DK |
1195 | sbi->s_group_desc[desc_block++]->b_data; |
1196 | if (le32_to_cpu(gdp->bg_block_bitmap) < first_block || | |
1197 | le32_to_cpu(gdp->bg_block_bitmap) > last_block) | |
1198 | { | |
617ba13b | 1199 | ext4_error (sb, "ext4_check_descriptors", |
ac27a0ec DK |
1200 | "Block bitmap for group %d" |
1201 | " not in group (block %lu)!", | |
1202 | i, (unsigned long) | |
1203 | le32_to_cpu(gdp->bg_block_bitmap)); | |
1204 | return 0; | |
1205 | } | |
1206 | if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block || | |
1207 | le32_to_cpu(gdp->bg_inode_bitmap) > last_block) | |
1208 | { | |
617ba13b | 1209 | ext4_error (sb, "ext4_check_descriptors", |
ac27a0ec DK |
1210 | "Inode bitmap for group %d" |
1211 | " not in group (block %lu)!", | |
1212 | i, (unsigned long) | |
1213 | le32_to_cpu(gdp->bg_inode_bitmap)); | |
1214 | return 0; | |
1215 | } | |
1216 | if (le32_to_cpu(gdp->bg_inode_table) < first_block || | |
1217 | le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group > | |
1218 | last_block) | |
1219 | { | |
617ba13b | 1220 | ext4_error (sb, "ext4_check_descriptors", |
ac27a0ec DK |
1221 | "Inode table for group %d" |
1222 | " not in group (block %lu)!", | |
1223 | i, (unsigned long) | |
1224 | le32_to_cpu(gdp->bg_inode_table)); | |
1225 | return 0; | |
1226 | } | |
617ba13b | 1227 | first_block += EXT4_BLOCKS_PER_GROUP(sb); |
ac27a0ec DK |
1228 | gdp++; |
1229 | } | |
1230 | ||
617ba13b MC |
1231 | sbi->s_es->s_free_blocks_count=cpu_to_le32(ext4_count_free_blocks(sb)); |
1232 | sbi->s_es->s_free_inodes_count=cpu_to_le32(ext4_count_free_inodes(sb)); | |
ac27a0ec DK |
1233 | return 1; |
1234 | } | |
1235 | ||
1236 | ||
617ba13b | 1237 | /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at |
ac27a0ec DK |
1238 | * the superblock) which were deleted from all directories, but held open by |
1239 | * a process at the time of a crash. We walk the list and try to delete these | |
1240 | * inodes at recovery time (only with a read-write filesystem). | |
1241 | * | |
1242 | * In order to keep the orphan inode chain consistent during traversal (in | |
1243 | * case of crash during recovery), we link each inode into the superblock | |
1244 | * orphan list_head and handle it the same way as an inode deletion during | |
1245 | * normal operation (which journals the operations for us). | |
1246 | * | |
1247 | * We only do an iget() and an iput() on each inode, which is very safe if we | |
1248 | * accidentally point at an in-use or already deleted inode. The worst that | |
1249 | * can happen in this case is that we get a "bit already cleared" message from | |
617ba13b | 1250 | * ext4_free_inode(). The only reason we would point at a wrong inode is if |
ac27a0ec DK |
1251 | * e2fsck was run on this filesystem, and it must have already done the orphan |
1252 | * inode cleanup for us, so we can safely abort without any further action. | |
1253 | */ | |
617ba13b MC |
1254 | static void ext4_orphan_cleanup (struct super_block * sb, |
1255 | struct ext4_super_block * es) | |
ac27a0ec DK |
1256 | { |
1257 | unsigned int s_flags = sb->s_flags; | |
1258 | int nr_orphans = 0, nr_truncates = 0; | |
1259 | #ifdef CONFIG_QUOTA | |
1260 | int i; | |
1261 | #endif | |
1262 | if (!es->s_last_orphan) { | |
1263 | jbd_debug(4, "no orphan inodes to clean up\n"); | |
1264 | return; | |
1265 | } | |
1266 | ||
617ba13b | 1267 | if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) { |
ac27a0ec DK |
1268 | if (es->s_last_orphan) |
1269 | jbd_debug(1, "Errors on filesystem, " | |
1270 | "clearing orphan list.\n"); | |
1271 | es->s_last_orphan = 0; | |
1272 | jbd_debug(1, "Skipping orphan recovery on fs with errors.\n"); | |
1273 | return; | |
1274 | } | |
1275 | ||
1276 | if (s_flags & MS_RDONLY) { | |
617ba13b | 1277 | printk(KERN_INFO "EXT4-fs: %s: orphan cleanup on readonly fs\n", |
ac27a0ec DK |
1278 | sb->s_id); |
1279 | sb->s_flags &= ~MS_RDONLY; | |
1280 | } | |
1281 | #ifdef CONFIG_QUOTA | |
1282 | /* Needed for iput() to work correctly and not trash data */ | |
1283 | sb->s_flags |= MS_ACTIVE; | |
1284 | /* Turn on quotas so that they are updated correctly */ | |
1285 | for (i = 0; i < MAXQUOTAS; i++) { | |
617ba13b MC |
1286 | if (EXT4_SB(sb)->s_qf_names[i]) { |
1287 | int ret = ext4_quota_on_mount(sb, i); | |
ac27a0ec DK |
1288 | if (ret < 0) |
1289 | printk(KERN_ERR | |
617ba13b | 1290 | "EXT4-fs: Cannot turn on journalled " |
ac27a0ec DK |
1291 | "quota: error %d\n", ret); |
1292 | } | |
1293 | } | |
1294 | #endif | |
1295 | ||
1296 | while (es->s_last_orphan) { | |
1297 | struct inode *inode; | |
1298 | ||
1299 | if (!(inode = | |
617ba13b | 1300 | ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan)))) { |
ac27a0ec DK |
1301 | es->s_last_orphan = 0; |
1302 | break; | |
1303 | } | |
1304 | ||
617ba13b | 1305 | list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan); |
ac27a0ec DK |
1306 | DQUOT_INIT(inode); |
1307 | if (inode->i_nlink) { | |
1308 | printk(KERN_DEBUG | |
1309 | "%s: truncating inode %lu to %Ld bytes\n", | |
1310 | __FUNCTION__, inode->i_ino, inode->i_size); | |
1311 | jbd_debug(2, "truncating inode %lu to %Ld bytes\n", | |
1312 | inode->i_ino, inode->i_size); | |
617ba13b | 1313 | ext4_truncate(inode); |
ac27a0ec DK |
1314 | nr_truncates++; |
1315 | } else { | |
1316 | printk(KERN_DEBUG | |
1317 | "%s: deleting unreferenced inode %lu\n", | |
1318 | __FUNCTION__, inode->i_ino); | |
1319 | jbd_debug(2, "deleting unreferenced inode %lu\n", | |
1320 | inode->i_ino); | |
1321 | nr_orphans++; | |
1322 | } | |
1323 | iput(inode); /* The delete magic happens here! */ | |
1324 | } | |
1325 | ||
1326 | #define PLURAL(x) (x), ((x)==1) ? "" : "s" | |
1327 | ||
1328 | if (nr_orphans) | |
617ba13b | 1329 | printk(KERN_INFO "EXT4-fs: %s: %d orphan inode%s deleted\n", |
ac27a0ec DK |
1330 | sb->s_id, PLURAL(nr_orphans)); |
1331 | if (nr_truncates) | |
617ba13b | 1332 | printk(KERN_INFO "EXT4-fs: %s: %d truncate%s cleaned up\n", |
ac27a0ec DK |
1333 | sb->s_id, PLURAL(nr_truncates)); |
1334 | #ifdef CONFIG_QUOTA | |
1335 | /* Turn quotas off */ | |
1336 | for (i = 0; i < MAXQUOTAS; i++) { | |
1337 | if (sb_dqopt(sb)->files[i]) | |
1338 | vfs_quota_off(sb, i); | |
1339 | } | |
1340 | #endif | |
1341 | sb->s_flags = s_flags; /* Restore MS_RDONLY status */ | |
1342 | } | |
1343 | ||
1344 | #define log2(n) ffz(~(n)) | |
1345 | ||
1346 | /* | |
1347 | * Maximal file size. There is a direct, and {,double-,triple-}indirect | |
1348 | * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks. | |
1349 | * We need to be 1 filesystem block less than the 2^32 sector limit. | |
1350 | */ | |
617ba13b | 1351 | static loff_t ext4_max_size(int bits) |
ac27a0ec | 1352 | { |
617ba13b | 1353 | loff_t res = EXT4_NDIR_BLOCKS; |
ac27a0ec DK |
1354 | /* This constant is calculated to be the largest file size for a |
1355 | * dense, 4k-blocksize file such that the total number of | |
1356 | * sectors in the file, including data and all indirect blocks, | |
1357 | * does not exceed 2^32. */ | |
1358 | const loff_t upper_limit = 0x1ff7fffd000LL; | |
1359 | ||
1360 | res += 1LL << (bits-2); | |
1361 | res += 1LL << (2*(bits-2)); | |
1362 | res += 1LL << (3*(bits-2)); | |
1363 | res <<= bits; | |
1364 | if (res > upper_limit) | |
1365 | res = upper_limit; | |
1366 | return res; | |
1367 | } | |
1368 | ||
617ba13b MC |
1369 | static ext4_fsblk_t descriptor_loc(struct super_block *sb, |
1370 | ext4_fsblk_t logic_sb_block, | |
ac27a0ec DK |
1371 | int nr) |
1372 | { | |
617ba13b | 1373 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
ac27a0ec DK |
1374 | unsigned long bg, first_meta_bg; |
1375 | int has_super = 0; | |
1376 | ||
1377 | first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg); | |
1378 | ||
617ba13b | 1379 | if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) || |
ac27a0ec DK |
1380 | nr < first_meta_bg) |
1381 | return (logic_sb_block + nr + 1); | |
1382 | bg = sbi->s_desc_per_block * nr; | |
617ba13b | 1383 | if (ext4_bg_has_super(sb, bg)) |
ac27a0ec | 1384 | has_super = 1; |
617ba13b | 1385 | return (has_super + ext4_group_first_block_no(sb, bg)); |
ac27a0ec DK |
1386 | } |
1387 | ||
1388 | ||
617ba13b | 1389 | static int ext4_fill_super (struct super_block *sb, void *data, int silent) |
ac27a0ec DK |
1390 | { |
1391 | struct buffer_head * bh; | |
617ba13b MC |
1392 | struct ext4_super_block *es = NULL; |
1393 | struct ext4_sb_info *sbi; | |
1394 | ext4_fsblk_t block; | |
1395 | ext4_fsblk_t sb_block = get_sb_block(&data); | |
1396 | ext4_fsblk_t logic_sb_block; | |
ac27a0ec DK |
1397 | unsigned long offset = 0; |
1398 | unsigned int journal_inum = 0; | |
1399 | unsigned long journal_devnum = 0; | |
1400 | unsigned long def_mount_opts; | |
1401 | struct inode *root; | |
1402 | int blocksize; | |
1403 | int hblock; | |
1404 | int db_count; | |
1405 | int i; | |
1406 | int needs_recovery; | |
1407 | __le32 features; | |
1408 | ||
1409 | sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); | |
1410 | if (!sbi) | |
1411 | return -ENOMEM; | |
1412 | sb->s_fs_info = sbi; | |
1413 | sbi->s_mount_opt = 0; | |
617ba13b MC |
1414 | sbi->s_resuid = EXT4_DEF_RESUID; |
1415 | sbi->s_resgid = EXT4_DEF_RESGID; | |
ac27a0ec DK |
1416 | |
1417 | unlock_kernel(); | |
1418 | ||
617ba13b | 1419 | blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE); |
ac27a0ec | 1420 | if (!blocksize) { |
617ba13b | 1421 | printk(KERN_ERR "EXT4-fs: unable to set blocksize\n"); |
ac27a0ec DK |
1422 | goto out_fail; |
1423 | } | |
1424 | ||
1425 | /* | |
617ba13b | 1426 | * The ext4 superblock will not be buffer aligned for other than 1kB |
ac27a0ec DK |
1427 | * block sizes. We need to calculate the offset from buffer start. |
1428 | */ | |
617ba13b MC |
1429 | if (blocksize != EXT4_MIN_BLOCK_SIZE) { |
1430 | logic_sb_block = (sb_block * EXT4_MIN_BLOCK_SIZE) / blocksize; | |
1431 | offset = (sb_block * EXT4_MIN_BLOCK_SIZE) % blocksize; | |
ac27a0ec DK |
1432 | } else { |
1433 | logic_sb_block = sb_block; | |
1434 | } | |
1435 | ||
1436 | if (!(bh = sb_bread(sb, logic_sb_block))) { | |
617ba13b | 1437 | printk (KERN_ERR "EXT4-fs: unable to read superblock\n"); |
ac27a0ec DK |
1438 | goto out_fail; |
1439 | } | |
1440 | /* | |
1441 | * Note: s_es must be initialized as soon as possible because | |
617ba13b | 1442 | * some ext4 macro-instructions depend on its value |
ac27a0ec | 1443 | */ |
617ba13b | 1444 | es = (struct ext4_super_block *) (((char *)bh->b_data) + offset); |
ac27a0ec DK |
1445 | sbi->s_es = es; |
1446 | sb->s_magic = le16_to_cpu(es->s_magic); | |
617ba13b MC |
1447 | if (sb->s_magic != EXT4_SUPER_MAGIC) |
1448 | goto cantfind_ext4; | |
ac27a0ec DK |
1449 | |
1450 | /* Set defaults before we parse the mount options */ | |
1451 | def_mount_opts = le32_to_cpu(es->s_default_mount_opts); | |
617ba13b | 1452 | if (def_mount_opts & EXT4_DEFM_DEBUG) |
ac27a0ec | 1453 | set_opt(sbi->s_mount_opt, DEBUG); |
617ba13b | 1454 | if (def_mount_opts & EXT4_DEFM_BSDGROUPS) |
ac27a0ec | 1455 | set_opt(sbi->s_mount_opt, GRPID); |
617ba13b | 1456 | if (def_mount_opts & EXT4_DEFM_UID16) |
ac27a0ec | 1457 | set_opt(sbi->s_mount_opt, NO_UID32); |
617ba13b | 1458 | if (def_mount_opts & EXT4_DEFM_XATTR_USER) |
ac27a0ec | 1459 | set_opt(sbi->s_mount_opt, XATTR_USER); |
617ba13b | 1460 | if (def_mount_opts & EXT4_DEFM_ACL) |
ac27a0ec | 1461 | set_opt(sbi->s_mount_opt, POSIX_ACL); |
617ba13b MC |
1462 | if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA) |
1463 | sbi->s_mount_opt |= EXT4_MOUNT_JOURNAL_DATA; | |
1464 | else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED) | |
1465 | sbi->s_mount_opt |= EXT4_MOUNT_ORDERED_DATA; | |
1466 | else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK) | |
1467 | sbi->s_mount_opt |= EXT4_MOUNT_WRITEBACK_DATA; | |
1468 | ||
1469 | if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC) | |
ac27a0ec | 1470 | set_opt(sbi->s_mount_opt, ERRORS_PANIC); |
617ba13b | 1471 | else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_RO) |
ac27a0ec DK |
1472 | set_opt(sbi->s_mount_opt, ERRORS_RO); |
1473 | ||
1474 | sbi->s_resuid = le16_to_cpu(es->s_def_resuid); | |
1475 | sbi->s_resgid = le16_to_cpu(es->s_def_resgid); | |
1476 | ||
1477 | set_opt(sbi->s_mount_opt, RESERVATION); | |
1478 | ||
1479 | if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum, | |
1480 | NULL, 0)) | |
1481 | goto failed_mount; | |
1482 | ||
1483 | sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | | |
617ba13b | 1484 | ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0); |
ac27a0ec | 1485 | |
617ba13b MC |
1486 | if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV && |
1487 | (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) || | |
1488 | EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) || | |
1489 | EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U))) | |
ac27a0ec | 1490 | printk(KERN_WARNING |
617ba13b | 1491 | "EXT4-fs warning: feature flags set on rev 0 fs, " |
ac27a0ec DK |
1492 | "running e2fsck is recommended\n"); |
1493 | /* | |
1494 | * Check feature flags regardless of the revision level, since we | |
1495 | * previously didn't change the revision level when setting the flags, | |
1496 | * so there is a chance incompat flags are set on a rev 0 filesystem. | |
1497 | */ | |
617ba13b | 1498 | features = EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP); |
ac27a0ec | 1499 | if (features) { |
617ba13b | 1500 | printk(KERN_ERR "EXT4-fs: %s: couldn't mount because of " |
ac27a0ec DK |
1501 | "unsupported optional features (%x).\n", |
1502 | sb->s_id, le32_to_cpu(features)); | |
1503 | goto failed_mount; | |
1504 | } | |
617ba13b | 1505 | features = EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP); |
ac27a0ec | 1506 | if (!(sb->s_flags & MS_RDONLY) && features) { |
617ba13b | 1507 | printk(KERN_ERR "EXT4-fs: %s: couldn't mount RDWR because of " |
ac27a0ec DK |
1508 | "unsupported optional features (%x).\n", |
1509 | sb->s_id, le32_to_cpu(features)); | |
1510 | goto failed_mount; | |
1511 | } | |
1512 | blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size); | |
1513 | ||
617ba13b MC |
1514 | if (blocksize < EXT4_MIN_BLOCK_SIZE || |
1515 | blocksize > EXT4_MAX_BLOCK_SIZE) { | |
ac27a0ec | 1516 | printk(KERN_ERR |
617ba13b | 1517 | "EXT4-fs: Unsupported filesystem blocksize %d on %s.\n", |
ac27a0ec DK |
1518 | blocksize, sb->s_id); |
1519 | goto failed_mount; | |
1520 | } | |
1521 | ||
1522 | hblock = bdev_hardsect_size(sb->s_bdev); | |
1523 | if (sb->s_blocksize != blocksize) { | |
1524 | /* | |
1525 | * Make sure the blocksize for the filesystem is larger | |
1526 | * than the hardware sectorsize for the machine. | |
1527 | */ | |
1528 | if (blocksize < hblock) { | |
617ba13b | 1529 | printk(KERN_ERR "EXT4-fs: blocksize %d too small for " |
ac27a0ec DK |
1530 | "device blocksize %d.\n", blocksize, hblock); |
1531 | goto failed_mount; | |
1532 | } | |
1533 | ||
1534 | brelse (bh); | |
1535 | sb_set_blocksize(sb, blocksize); | |
617ba13b MC |
1536 | logic_sb_block = (sb_block * EXT4_MIN_BLOCK_SIZE) / blocksize; |
1537 | offset = (sb_block * EXT4_MIN_BLOCK_SIZE) % blocksize; | |
ac27a0ec DK |
1538 | bh = sb_bread(sb, logic_sb_block); |
1539 | if (!bh) { | |
1540 | printk(KERN_ERR | |
617ba13b | 1541 | "EXT4-fs: Can't read superblock on 2nd try.\n"); |
ac27a0ec DK |
1542 | goto failed_mount; |
1543 | } | |
617ba13b | 1544 | es = (struct ext4_super_block *)(((char *)bh->b_data) + offset); |
ac27a0ec | 1545 | sbi->s_es = es; |
617ba13b | 1546 | if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) { |
ac27a0ec | 1547 | printk (KERN_ERR |
617ba13b | 1548 | "EXT4-fs: Magic mismatch, very weird !\n"); |
ac27a0ec DK |
1549 | goto failed_mount; |
1550 | } | |
1551 | } | |
1552 | ||
617ba13b | 1553 | sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits); |
ac27a0ec | 1554 | |
617ba13b MC |
1555 | if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) { |
1556 | sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE; | |
1557 | sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO; | |
ac27a0ec DK |
1558 | } else { |
1559 | sbi->s_inode_size = le16_to_cpu(es->s_inode_size); | |
1560 | sbi->s_first_ino = le32_to_cpu(es->s_first_ino); | |
617ba13b | 1561 | if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) || |
ac27a0ec DK |
1562 | (sbi->s_inode_size & (sbi->s_inode_size - 1)) || |
1563 | (sbi->s_inode_size > blocksize)) { | |
1564 | printk (KERN_ERR | |
617ba13b | 1565 | "EXT4-fs: unsupported inode size: %d\n", |
ac27a0ec DK |
1566 | sbi->s_inode_size); |
1567 | goto failed_mount; | |
1568 | } | |
1569 | } | |
617ba13b | 1570 | sbi->s_frag_size = EXT4_MIN_FRAG_SIZE << |
ac27a0ec DK |
1571 | le32_to_cpu(es->s_log_frag_size); |
1572 | if (blocksize != sbi->s_frag_size) { | |
1573 | printk(KERN_ERR | |
617ba13b | 1574 | "EXT4-fs: fragsize %lu != blocksize %u (unsupported)\n", |
ac27a0ec DK |
1575 | sbi->s_frag_size, blocksize); |
1576 | goto failed_mount; | |
1577 | } | |
1578 | sbi->s_frags_per_block = 1; | |
1579 | sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group); | |
1580 | sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group); | |
1581 | sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group); | |
617ba13b MC |
1582 | if (EXT4_INODE_SIZE(sb) == 0) |
1583 | goto cantfind_ext4; | |
1584 | sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb); | |
ac27a0ec | 1585 | if (sbi->s_inodes_per_block == 0) |
617ba13b | 1586 | goto cantfind_ext4; |
ac27a0ec DK |
1587 | sbi->s_itb_per_group = sbi->s_inodes_per_group / |
1588 | sbi->s_inodes_per_block; | |
617ba13b | 1589 | sbi->s_desc_per_block = blocksize / sizeof(struct ext4_group_desc); |
ac27a0ec DK |
1590 | sbi->s_sbh = bh; |
1591 | sbi->s_mount_state = le16_to_cpu(es->s_state); | |
617ba13b MC |
1592 | sbi->s_addr_per_block_bits = log2(EXT4_ADDR_PER_BLOCK(sb)); |
1593 | sbi->s_desc_per_block_bits = log2(EXT4_DESC_PER_BLOCK(sb)); | |
ac27a0ec DK |
1594 | for (i=0; i < 4; i++) |
1595 | sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]); | |
1596 | sbi->s_def_hash_version = es->s_def_hash_version; | |
1597 | ||
1598 | if (sbi->s_blocks_per_group > blocksize * 8) { | |
1599 | printk (KERN_ERR | |
617ba13b | 1600 | "EXT4-fs: #blocks per group too big: %lu\n", |
ac27a0ec DK |
1601 | sbi->s_blocks_per_group); |
1602 | goto failed_mount; | |
1603 | } | |
1604 | if (sbi->s_frags_per_group > blocksize * 8) { | |
1605 | printk (KERN_ERR | |
617ba13b | 1606 | "EXT4-fs: #fragments per group too big: %lu\n", |
ac27a0ec DK |
1607 | sbi->s_frags_per_group); |
1608 | goto failed_mount; | |
1609 | } | |
1610 | if (sbi->s_inodes_per_group > blocksize * 8) { | |
1611 | printk (KERN_ERR | |
617ba13b | 1612 | "EXT4-fs: #inodes per group too big: %lu\n", |
ac27a0ec DK |
1613 | sbi->s_inodes_per_group); |
1614 | goto failed_mount; | |
1615 | } | |
1616 | ||
1617 | if (le32_to_cpu(es->s_blocks_count) > | |
1618 | (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) { | |
617ba13b | 1619 | printk(KERN_ERR "EXT4-fs: filesystem on %s:" |
ac27a0ec DK |
1620 | " too large to mount safely\n", sb->s_id); |
1621 | if (sizeof(sector_t) < 8) | |
617ba13b | 1622 | printk(KERN_WARNING "EXT4-fs: CONFIG_LBD not " |
ac27a0ec DK |
1623 | "enabled\n"); |
1624 | goto failed_mount; | |
1625 | } | |
1626 | ||
617ba13b MC |
1627 | if (EXT4_BLOCKS_PER_GROUP(sb) == 0) |
1628 | goto cantfind_ext4; | |
ac27a0ec DK |
1629 | sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) - |
1630 | le32_to_cpu(es->s_first_data_block) - 1) | |
617ba13b MC |
1631 | / EXT4_BLOCKS_PER_GROUP(sb)) + 1; |
1632 | db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) / | |
1633 | EXT4_DESC_PER_BLOCK(sb); | |
ac27a0ec DK |
1634 | sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *), |
1635 | GFP_KERNEL); | |
1636 | if (sbi->s_group_desc == NULL) { | |
617ba13b | 1637 | printk (KERN_ERR "EXT4-fs: not enough memory\n"); |
ac27a0ec DK |
1638 | goto failed_mount; |
1639 | } | |
1640 | ||
1641 | bgl_lock_init(&sbi->s_blockgroup_lock); | |
1642 | ||
1643 | for (i = 0; i < db_count; i++) { | |
1644 | block = descriptor_loc(sb, logic_sb_block, i); | |
1645 | sbi->s_group_desc[i] = sb_bread(sb, block); | |
1646 | if (!sbi->s_group_desc[i]) { | |
617ba13b | 1647 | printk (KERN_ERR "EXT4-fs: " |
ac27a0ec DK |
1648 | "can't read group descriptor %d\n", i); |
1649 | db_count = i; | |
1650 | goto failed_mount2; | |
1651 | } | |
1652 | } | |
617ba13b MC |
1653 | if (!ext4_check_descriptors (sb)) { |
1654 | printk(KERN_ERR "EXT4-fs: group descriptors corrupted!\n"); | |
ac27a0ec DK |
1655 | goto failed_mount2; |
1656 | } | |
1657 | sbi->s_gdb_count = db_count; | |
1658 | get_random_bytes(&sbi->s_next_generation, sizeof(u32)); | |
1659 | spin_lock_init(&sbi->s_next_gen_lock); | |
1660 | ||
1661 | percpu_counter_init(&sbi->s_freeblocks_counter, | |
617ba13b | 1662 | ext4_count_free_blocks(sb)); |
ac27a0ec | 1663 | percpu_counter_init(&sbi->s_freeinodes_counter, |
617ba13b | 1664 | ext4_count_free_inodes(sb)); |
ac27a0ec | 1665 | percpu_counter_init(&sbi->s_dirs_counter, |
617ba13b | 1666 | ext4_count_dirs(sb)); |
ac27a0ec DK |
1667 | |
1668 | /* per fileystem reservation list head & lock */ | |
1669 | spin_lock_init(&sbi->s_rsv_window_lock); | |
1670 | sbi->s_rsv_window_root = RB_ROOT; | |
1671 | /* Add a single, static dummy reservation to the start of the | |
1672 | * reservation window list --- it gives us a placeholder for | |
1673 | * append-at-start-of-list which makes the allocation logic | |
1674 | * _much_ simpler. */ | |
617ba13b MC |
1675 | sbi->s_rsv_window_head.rsv_start = EXT4_RESERVE_WINDOW_NOT_ALLOCATED; |
1676 | sbi->s_rsv_window_head.rsv_end = EXT4_RESERVE_WINDOW_NOT_ALLOCATED; | |
ac27a0ec DK |
1677 | sbi->s_rsv_window_head.rsv_alloc_hit = 0; |
1678 | sbi->s_rsv_window_head.rsv_goal_size = 0; | |
617ba13b | 1679 | ext4_rsv_window_add(sb, &sbi->s_rsv_window_head); |
ac27a0ec DK |
1680 | |
1681 | /* | |
1682 | * set up enough so that it can read an inode | |
1683 | */ | |
617ba13b MC |
1684 | sb->s_op = &ext4_sops; |
1685 | sb->s_export_op = &ext4_export_ops; | |
1686 | sb->s_xattr = ext4_xattr_handlers; | |
ac27a0ec | 1687 | #ifdef CONFIG_QUOTA |
617ba13b MC |
1688 | sb->s_qcop = &ext4_qctl_operations; |
1689 | sb->dq_op = &ext4_quota_operations; | |
ac27a0ec DK |
1690 | #endif |
1691 | INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */ | |
1692 | ||
1693 | sb->s_root = NULL; | |
1694 | ||
1695 | needs_recovery = (es->s_last_orphan != 0 || | |
617ba13b MC |
1696 | EXT4_HAS_INCOMPAT_FEATURE(sb, |
1697 | EXT4_FEATURE_INCOMPAT_RECOVER)); | |
ac27a0ec DK |
1698 | |
1699 | /* | |
1700 | * The first inode we look at is the journal inode. Don't try | |
1701 | * root first: it may be modified in the journal! | |
1702 | */ | |
1703 | if (!test_opt(sb, NOLOAD) && | |
617ba13b MC |
1704 | EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) { |
1705 | if (ext4_load_journal(sb, es, journal_devnum)) | |
ac27a0ec DK |
1706 | goto failed_mount3; |
1707 | } else if (journal_inum) { | |
617ba13b | 1708 | if (ext4_create_journal(sb, es, journal_inum)) |
ac27a0ec DK |
1709 | goto failed_mount3; |
1710 | } else { | |
1711 | if (!silent) | |
1712 | printk (KERN_ERR | |
617ba13b | 1713 | "ext4: No journal on filesystem on %s\n", |
ac27a0ec DK |
1714 | sb->s_id); |
1715 | goto failed_mount3; | |
1716 | } | |
1717 | ||
1718 | /* We have now updated the journal if required, so we can | |
1719 | * validate the data journaling mode. */ | |
1720 | switch (test_opt(sb, DATA_FLAGS)) { | |
1721 | case 0: | |
1722 | /* No mode set, assume a default based on the journal | |
1723 | capabilities: ORDERED_DATA if the journal can | |
1724 | cope, else JOURNAL_DATA */ | |
1725 | if (journal_check_available_features | |
1726 | (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE)) | |
1727 | set_opt(sbi->s_mount_opt, ORDERED_DATA); | |
1728 | else | |
1729 | set_opt(sbi->s_mount_opt, JOURNAL_DATA); | |
1730 | break; | |
1731 | ||
617ba13b MC |
1732 | case EXT4_MOUNT_ORDERED_DATA: |
1733 | case EXT4_MOUNT_WRITEBACK_DATA: | |
ac27a0ec DK |
1734 | if (!journal_check_available_features |
1735 | (sbi->s_journal, 0, 0, JFS_FEATURE_INCOMPAT_REVOKE)) { | |
617ba13b | 1736 | printk(KERN_ERR "EXT4-fs: Journal does not support " |
ac27a0ec DK |
1737 | "requested data journaling mode\n"); |
1738 | goto failed_mount4; | |
1739 | } | |
1740 | default: | |
1741 | break; | |
1742 | } | |
1743 | ||
1744 | if (test_opt(sb, NOBH)) { | |
617ba13b MC |
1745 | if (!(test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)) { |
1746 | printk(KERN_WARNING "EXT4-fs: Ignoring nobh option - " | |
ac27a0ec DK |
1747 | "its supported only with writeback mode\n"); |
1748 | clear_opt(sbi->s_mount_opt, NOBH); | |
1749 | } | |
1750 | } | |
1751 | /* | |
1752 | * The journal_load will have done any necessary log recovery, | |
1753 | * so we can safely mount the rest of the filesystem now. | |
1754 | */ | |
1755 | ||
617ba13b | 1756 | root = iget(sb, EXT4_ROOT_INO); |
ac27a0ec DK |
1757 | sb->s_root = d_alloc_root(root); |
1758 | if (!sb->s_root) { | |
617ba13b | 1759 | printk(KERN_ERR "EXT4-fs: get root inode failed\n"); |
ac27a0ec DK |
1760 | iput(root); |
1761 | goto failed_mount4; | |
1762 | } | |
1763 | if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { | |
1764 | dput(sb->s_root); | |
1765 | sb->s_root = NULL; | |
617ba13b | 1766 | printk(KERN_ERR "EXT4-fs: corrupt root inode, run e2fsck\n"); |
ac27a0ec DK |
1767 | goto failed_mount4; |
1768 | } | |
1769 | ||
617ba13b | 1770 | ext4_setup_super (sb, es, sb->s_flags & MS_RDONLY); |
ac27a0ec DK |
1771 | /* |
1772 | * akpm: core read_super() calls in here with the superblock locked. | |
1773 | * That deadlocks, because orphan cleanup needs to lock the superblock | |
1774 | * in numerous places. Here we just pop the lock - it's relatively | |
1775 | * harmless, because we are now ready to accept write_super() requests, | |
1776 | * and aviro says that's the only reason for hanging onto the | |
1777 | * superblock lock. | |
1778 | */ | |
617ba13b MC |
1779 | EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS; |
1780 | ext4_orphan_cleanup(sb, es); | |
1781 | EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS; | |
ac27a0ec | 1782 | if (needs_recovery) |
617ba13b MC |
1783 | printk (KERN_INFO "EXT4-fs: recovery complete.\n"); |
1784 | ext4_mark_recovery_complete(sb, es); | |
1785 | printk (KERN_INFO "EXT4-fs: mounted filesystem with %s data mode.\n", | |
1786 | test_opt(sb,DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA ? "journal": | |
1787 | test_opt(sb,DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA ? "ordered": | |
ac27a0ec DK |
1788 | "writeback"); |
1789 | ||
1790 | lock_kernel(); | |
1791 | return 0; | |
1792 | ||
617ba13b | 1793 | cantfind_ext4: |
ac27a0ec | 1794 | if (!silent) |
617ba13b | 1795 | printk(KERN_ERR "VFS: Can't find ext4 filesystem on dev %s.\n", |
ac27a0ec DK |
1796 | sb->s_id); |
1797 | goto failed_mount; | |
1798 | ||
1799 | failed_mount4: | |
1800 | journal_destroy(sbi->s_journal); | |
1801 | failed_mount3: | |
1802 | percpu_counter_destroy(&sbi->s_freeblocks_counter); | |
1803 | percpu_counter_destroy(&sbi->s_freeinodes_counter); | |
1804 | percpu_counter_destroy(&sbi->s_dirs_counter); | |
1805 | failed_mount2: | |
1806 | for (i = 0; i < db_count; i++) | |
1807 | brelse(sbi->s_group_desc[i]); | |
1808 | kfree(sbi->s_group_desc); | |
1809 | failed_mount: | |
1810 | #ifdef CONFIG_QUOTA | |
1811 | for (i = 0; i < MAXQUOTAS; i++) | |
1812 | kfree(sbi->s_qf_names[i]); | |
1813 | #endif | |
617ba13b | 1814 | ext4_blkdev_remove(sbi); |
ac27a0ec DK |
1815 | brelse(bh); |
1816 | out_fail: | |
1817 | sb->s_fs_info = NULL; | |
1818 | kfree(sbi); | |
1819 | lock_kernel(); | |
1820 | return -EINVAL; | |
1821 | } | |
1822 | ||
1823 | /* | |
1824 | * Setup any per-fs journal parameters now. We'll do this both on | |
1825 | * initial mount, once the journal has been initialised but before we've | |
1826 | * done any recovery; and again on any subsequent remount. | |
1827 | */ | |
617ba13b | 1828 | static void ext4_init_journal_params(struct super_block *sb, journal_t *journal) |
ac27a0ec | 1829 | { |
617ba13b | 1830 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
ac27a0ec DK |
1831 | |
1832 | if (sbi->s_commit_interval) | |
1833 | journal->j_commit_interval = sbi->s_commit_interval; | |
617ba13b | 1834 | /* We could also set up an ext4-specific default for the commit |
ac27a0ec DK |
1835 | * interval here, but for now we'll just fall back to the jbd |
1836 | * default. */ | |
1837 | ||
1838 | spin_lock(&journal->j_state_lock); | |
1839 | if (test_opt(sb, BARRIER)) | |
1840 | journal->j_flags |= JFS_BARRIER; | |
1841 | else | |
1842 | journal->j_flags &= ~JFS_BARRIER; | |
1843 | spin_unlock(&journal->j_state_lock); | |
1844 | } | |
1845 | ||
617ba13b | 1846 | static journal_t *ext4_get_journal(struct super_block *sb, |
ac27a0ec DK |
1847 | unsigned int journal_inum) |
1848 | { | |
1849 | struct inode *journal_inode; | |
1850 | journal_t *journal; | |
1851 | ||
1852 | /* First, test for the existence of a valid inode on disk. Bad | |
1853 | * things happen if we iget() an unused inode, as the subsequent | |
1854 | * iput() will try to delete it. */ | |
1855 | ||
1856 | journal_inode = iget(sb, journal_inum); | |
1857 | if (!journal_inode) { | |
617ba13b | 1858 | printk(KERN_ERR "EXT4-fs: no journal found.\n"); |
ac27a0ec DK |
1859 | return NULL; |
1860 | } | |
1861 | if (!journal_inode->i_nlink) { | |
1862 | make_bad_inode(journal_inode); | |
1863 | iput(journal_inode); | |
617ba13b | 1864 | printk(KERN_ERR "EXT4-fs: journal inode is deleted.\n"); |
ac27a0ec DK |
1865 | return NULL; |
1866 | } | |
1867 | ||
1868 | jbd_debug(2, "Journal inode found at %p: %Ld bytes\n", | |
1869 | journal_inode, journal_inode->i_size); | |
1870 | if (is_bad_inode(journal_inode) || !S_ISREG(journal_inode->i_mode)) { | |
617ba13b | 1871 | printk(KERN_ERR "EXT4-fs: invalid journal inode.\n"); |
ac27a0ec DK |
1872 | iput(journal_inode); |
1873 | return NULL; | |
1874 | } | |
1875 | ||
1876 | journal = journal_init_inode(journal_inode); | |
1877 | if (!journal) { | |
617ba13b | 1878 | printk(KERN_ERR "EXT4-fs: Could not load journal inode\n"); |
ac27a0ec DK |
1879 | iput(journal_inode); |
1880 | return NULL; | |
1881 | } | |
1882 | journal->j_private = sb; | |
617ba13b | 1883 | ext4_init_journal_params(sb, journal); |
ac27a0ec DK |
1884 | return journal; |
1885 | } | |
1886 | ||
617ba13b | 1887 | static journal_t *ext4_get_dev_journal(struct super_block *sb, |
ac27a0ec DK |
1888 | dev_t j_dev) |
1889 | { | |
1890 | struct buffer_head * bh; | |
1891 | journal_t *journal; | |
617ba13b MC |
1892 | ext4_fsblk_t start; |
1893 | ext4_fsblk_t len; | |
ac27a0ec | 1894 | int hblock, blocksize; |
617ba13b | 1895 | ext4_fsblk_t sb_block; |
ac27a0ec | 1896 | unsigned long offset; |
617ba13b | 1897 | struct ext4_super_block * es; |
ac27a0ec DK |
1898 | struct block_device *bdev; |
1899 | ||
617ba13b | 1900 | bdev = ext4_blkdev_get(j_dev); |
ac27a0ec DK |
1901 | if (bdev == NULL) |
1902 | return NULL; | |
1903 | ||
1904 | if (bd_claim(bdev, sb)) { | |
1905 | printk(KERN_ERR | |
617ba13b | 1906 | "EXT4: failed to claim external journal device.\n"); |
ac27a0ec DK |
1907 | blkdev_put(bdev); |
1908 | return NULL; | |
1909 | } | |
1910 | ||
1911 | blocksize = sb->s_blocksize; | |
1912 | hblock = bdev_hardsect_size(bdev); | |
1913 | if (blocksize < hblock) { | |
1914 | printk(KERN_ERR | |
617ba13b | 1915 | "EXT4-fs: blocksize too small for journal device.\n"); |
ac27a0ec DK |
1916 | goto out_bdev; |
1917 | } | |
1918 | ||
617ba13b MC |
1919 | sb_block = EXT4_MIN_BLOCK_SIZE / blocksize; |
1920 | offset = EXT4_MIN_BLOCK_SIZE % blocksize; | |
ac27a0ec DK |
1921 | set_blocksize(bdev, blocksize); |
1922 | if (!(bh = __bread(bdev, sb_block, blocksize))) { | |
617ba13b | 1923 | printk(KERN_ERR "EXT4-fs: couldn't read superblock of " |
ac27a0ec DK |
1924 | "external journal\n"); |
1925 | goto out_bdev; | |
1926 | } | |
1927 | ||
617ba13b MC |
1928 | es = (struct ext4_super_block *) (((char *)bh->b_data) + offset); |
1929 | if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) || | |
ac27a0ec | 1930 | !(le32_to_cpu(es->s_feature_incompat) & |
617ba13b MC |
1931 | EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) { |
1932 | printk(KERN_ERR "EXT4-fs: external journal has " | |
ac27a0ec DK |
1933 | "bad superblock\n"); |
1934 | brelse(bh); | |
1935 | goto out_bdev; | |
1936 | } | |
1937 | ||
617ba13b MC |
1938 | if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) { |
1939 | printk(KERN_ERR "EXT4-fs: journal UUID does not match\n"); | |
ac27a0ec DK |
1940 | brelse(bh); |
1941 | goto out_bdev; | |
1942 | } | |
1943 | ||
1944 | len = le32_to_cpu(es->s_blocks_count); | |
1945 | start = sb_block + 1; | |
1946 | brelse(bh); /* we're done with the superblock */ | |
1947 | ||
1948 | journal = journal_init_dev(bdev, sb->s_bdev, | |
1949 | start, len, blocksize); | |
1950 | if (!journal) { | |
617ba13b | 1951 | printk(KERN_ERR "EXT4-fs: failed to create device journal\n"); |
ac27a0ec DK |
1952 | goto out_bdev; |
1953 | } | |
1954 | journal->j_private = sb; | |
1955 | ll_rw_block(READ, 1, &journal->j_sb_buffer); | |
1956 | wait_on_buffer(journal->j_sb_buffer); | |
1957 | if (!buffer_uptodate(journal->j_sb_buffer)) { | |
617ba13b | 1958 | printk(KERN_ERR "EXT4-fs: I/O error on journal device\n"); |
ac27a0ec DK |
1959 | goto out_journal; |
1960 | } | |
1961 | if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) { | |
617ba13b | 1962 | printk(KERN_ERR "EXT4-fs: External journal has more than one " |
ac27a0ec DK |
1963 | "user (unsupported) - %d\n", |
1964 | be32_to_cpu(journal->j_superblock->s_nr_users)); | |
1965 | goto out_journal; | |
1966 | } | |
617ba13b MC |
1967 | EXT4_SB(sb)->journal_bdev = bdev; |
1968 | ext4_init_journal_params(sb, journal); | |
ac27a0ec DK |
1969 | return journal; |
1970 | out_journal: | |
1971 | journal_destroy(journal); | |
1972 | out_bdev: | |
617ba13b | 1973 | ext4_blkdev_put(bdev); |
ac27a0ec DK |
1974 | return NULL; |
1975 | } | |
1976 | ||
617ba13b MC |
1977 | static int ext4_load_journal(struct super_block *sb, |
1978 | struct ext4_super_block *es, | |
ac27a0ec DK |
1979 | unsigned long journal_devnum) |
1980 | { | |
1981 | journal_t *journal; | |
1982 | unsigned int journal_inum = le32_to_cpu(es->s_journal_inum); | |
1983 | dev_t journal_dev; | |
1984 | int err = 0; | |
1985 | int really_read_only; | |
1986 | ||
1987 | if (journal_devnum && | |
1988 | journal_devnum != le32_to_cpu(es->s_journal_dev)) { | |
617ba13b | 1989 | printk(KERN_INFO "EXT4-fs: external journal device major/minor " |
ac27a0ec DK |
1990 | "numbers have changed\n"); |
1991 | journal_dev = new_decode_dev(journal_devnum); | |
1992 | } else | |
1993 | journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev)); | |
1994 | ||
1995 | really_read_only = bdev_read_only(sb->s_bdev); | |
1996 | ||
1997 | /* | |
1998 | * Are we loading a blank journal or performing recovery after a | |
1999 | * crash? For recovery, we need to check in advance whether we | |
2000 | * can get read-write access to the device. | |
2001 | */ | |
2002 | ||
617ba13b | 2003 | if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) { |
ac27a0ec | 2004 | if (sb->s_flags & MS_RDONLY) { |
617ba13b | 2005 | printk(KERN_INFO "EXT4-fs: INFO: recovery " |
ac27a0ec DK |
2006 | "required on readonly filesystem.\n"); |
2007 | if (really_read_only) { | |
617ba13b | 2008 | printk(KERN_ERR "EXT4-fs: write access " |
ac27a0ec DK |
2009 | "unavailable, cannot proceed.\n"); |
2010 | return -EROFS; | |
2011 | } | |
617ba13b | 2012 | printk (KERN_INFO "EXT4-fs: write access will " |
ac27a0ec DK |
2013 | "be enabled during recovery.\n"); |
2014 | } | |
2015 | } | |
2016 | ||
2017 | if (journal_inum && journal_dev) { | |
617ba13b | 2018 | printk(KERN_ERR "EXT4-fs: filesystem has both journal " |
ac27a0ec DK |
2019 | "and inode journals!\n"); |
2020 | return -EINVAL; | |
2021 | } | |
2022 | ||
2023 | if (journal_inum) { | |
617ba13b | 2024 | if (!(journal = ext4_get_journal(sb, journal_inum))) |
ac27a0ec DK |
2025 | return -EINVAL; |
2026 | } else { | |
617ba13b | 2027 | if (!(journal = ext4_get_dev_journal(sb, journal_dev))) |
ac27a0ec DK |
2028 | return -EINVAL; |
2029 | } | |
2030 | ||
2031 | if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) { | |
2032 | err = journal_update_format(journal); | |
2033 | if (err) { | |
617ba13b | 2034 | printk(KERN_ERR "EXT4-fs: error updating journal.\n"); |
ac27a0ec DK |
2035 | journal_destroy(journal); |
2036 | return err; | |
2037 | } | |
2038 | } | |
2039 | ||
617ba13b | 2040 | if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) |
ac27a0ec DK |
2041 | err = journal_wipe(journal, !really_read_only); |
2042 | if (!err) | |
2043 | err = journal_load(journal); | |
2044 | ||
2045 | if (err) { | |
617ba13b | 2046 | printk(KERN_ERR "EXT4-fs: error loading journal.\n"); |
ac27a0ec DK |
2047 | journal_destroy(journal); |
2048 | return err; | |
2049 | } | |
2050 | ||
617ba13b MC |
2051 | EXT4_SB(sb)->s_journal = journal; |
2052 | ext4_clear_journal_err(sb, es); | |
ac27a0ec DK |
2053 | |
2054 | if (journal_devnum && | |
2055 | journal_devnum != le32_to_cpu(es->s_journal_dev)) { | |
2056 | es->s_journal_dev = cpu_to_le32(journal_devnum); | |
2057 | sb->s_dirt = 1; | |
2058 | ||
2059 | /* Make sure we flush the recovery flag to disk. */ | |
617ba13b | 2060 | ext4_commit_super(sb, es, 1); |
ac27a0ec DK |
2061 | } |
2062 | ||
2063 | return 0; | |
2064 | } | |
2065 | ||
617ba13b MC |
2066 | static int ext4_create_journal(struct super_block * sb, |
2067 | struct ext4_super_block * es, | |
ac27a0ec DK |
2068 | unsigned int journal_inum) |
2069 | { | |
2070 | journal_t *journal; | |
2071 | ||
2072 | if (sb->s_flags & MS_RDONLY) { | |
617ba13b | 2073 | printk(KERN_ERR "EXT4-fs: readonly filesystem when trying to " |
ac27a0ec DK |
2074 | "create journal.\n"); |
2075 | return -EROFS; | |
2076 | } | |
2077 | ||
617ba13b | 2078 | if (!(journal = ext4_get_journal(sb, journal_inum))) |
ac27a0ec DK |
2079 | return -EINVAL; |
2080 | ||
617ba13b | 2081 | printk(KERN_INFO "EXT4-fs: creating new journal on inode %u\n", |
ac27a0ec DK |
2082 | journal_inum); |
2083 | ||
2084 | if (journal_create(journal)) { | |
617ba13b | 2085 | printk(KERN_ERR "EXT4-fs: error creating journal.\n"); |
ac27a0ec DK |
2086 | journal_destroy(journal); |
2087 | return -EIO; | |
2088 | } | |
2089 | ||
617ba13b | 2090 | EXT4_SB(sb)->s_journal = journal; |
ac27a0ec | 2091 | |
617ba13b MC |
2092 | ext4_update_dynamic_rev(sb); |
2093 | EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); | |
2094 | EXT4_SET_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL); | |
ac27a0ec DK |
2095 | |
2096 | es->s_journal_inum = cpu_to_le32(journal_inum); | |
2097 | sb->s_dirt = 1; | |
2098 | ||
2099 | /* Make sure we flush the recovery flag to disk. */ | |
617ba13b | 2100 | ext4_commit_super(sb, es, 1); |
ac27a0ec DK |
2101 | |
2102 | return 0; | |
2103 | } | |
2104 | ||
617ba13b MC |
2105 | static void ext4_commit_super (struct super_block * sb, |
2106 | struct ext4_super_block * es, | |
ac27a0ec DK |
2107 | int sync) |
2108 | { | |
617ba13b | 2109 | struct buffer_head *sbh = EXT4_SB(sb)->s_sbh; |
ac27a0ec DK |
2110 | |
2111 | if (!sbh) | |
2112 | return; | |
2113 | es->s_wtime = cpu_to_le32(get_seconds()); | |
617ba13b MC |
2114 | es->s_free_blocks_count = cpu_to_le32(ext4_count_free_blocks(sb)); |
2115 | es->s_free_inodes_count = cpu_to_le32(ext4_count_free_inodes(sb)); | |
ac27a0ec DK |
2116 | BUFFER_TRACE(sbh, "marking dirty"); |
2117 | mark_buffer_dirty(sbh); | |
2118 | if (sync) | |
2119 | sync_dirty_buffer(sbh); | |
2120 | } | |
2121 | ||
2122 | ||
2123 | /* | |
2124 | * Have we just finished recovery? If so, and if we are mounting (or | |
2125 | * remounting) the filesystem readonly, then we will end up with a | |
2126 | * consistent fs on disk. Record that fact. | |
2127 | */ | |
617ba13b MC |
2128 | static void ext4_mark_recovery_complete(struct super_block * sb, |
2129 | struct ext4_super_block * es) | |
ac27a0ec | 2130 | { |
617ba13b | 2131 | journal_t *journal = EXT4_SB(sb)->s_journal; |
ac27a0ec DK |
2132 | |
2133 | journal_lock_updates(journal); | |
2134 | journal_flush(journal); | |
617ba13b | 2135 | if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) && |
ac27a0ec | 2136 | sb->s_flags & MS_RDONLY) { |
617ba13b | 2137 | EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); |
ac27a0ec | 2138 | sb->s_dirt = 0; |
617ba13b | 2139 | ext4_commit_super(sb, es, 1); |
ac27a0ec DK |
2140 | } |
2141 | journal_unlock_updates(journal); | |
2142 | } | |
2143 | ||
2144 | /* | |
2145 | * If we are mounting (or read-write remounting) a filesystem whose journal | |
2146 | * has recorded an error from a previous lifetime, move that error to the | |
2147 | * main filesystem now. | |
2148 | */ | |
617ba13b MC |
2149 | static void ext4_clear_journal_err(struct super_block * sb, |
2150 | struct ext4_super_block * es) | |
ac27a0ec DK |
2151 | { |
2152 | journal_t *journal; | |
2153 | int j_errno; | |
2154 | const char *errstr; | |
2155 | ||
617ba13b | 2156 | journal = EXT4_SB(sb)->s_journal; |
ac27a0ec DK |
2157 | |
2158 | /* | |
2159 | * Now check for any error status which may have been recorded in the | |
617ba13b | 2160 | * journal by a prior ext4_error() or ext4_abort() |
ac27a0ec DK |
2161 | */ |
2162 | ||
2163 | j_errno = journal_errno(journal); | |
2164 | if (j_errno) { | |
2165 | char nbuf[16]; | |
2166 | ||
617ba13b MC |
2167 | errstr = ext4_decode_error(sb, j_errno, nbuf); |
2168 | ext4_warning(sb, __FUNCTION__, "Filesystem error recorded " | |
ac27a0ec | 2169 | "from previous mount: %s", errstr); |
617ba13b | 2170 | ext4_warning(sb, __FUNCTION__, "Marking fs in need of " |
ac27a0ec DK |
2171 | "filesystem check."); |
2172 | ||
617ba13b MC |
2173 | EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; |
2174 | es->s_state |= cpu_to_le16(EXT4_ERROR_FS); | |
2175 | ext4_commit_super (sb, es, 1); | |
ac27a0ec DK |
2176 | |
2177 | journal_clear_err(journal); | |
2178 | } | |
2179 | } | |
2180 | ||
2181 | /* | |
2182 | * Force the running and committing transactions to commit, | |
2183 | * and wait on the commit. | |
2184 | */ | |
617ba13b | 2185 | int ext4_force_commit(struct super_block *sb) |
ac27a0ec DK |
2186 | { |
2187 | journal_t *journal; | |
2188 | int ret; | |
2189 | ||
2190 | if (sb->s_flags & MS_RDONLY) | |
2191 | return 0; | |
2192 | ||
617ba13b | 2193 | journal = EXT4_SB(sb)->s_journal; |
ac27a0ec | 2194 | sb->s_dirt = 0; |
617ba13b | 2195 | ret = ext4_journal_force_commit(journal); |
ac27a0ec DK |
2196 | return ret; |
2197 | } | |
2198 | ||
2199 | /* | |
617ba13b | 2200 | * Ext4 always journals updates to the superblock itself, so we don't |
ac27a0ec DK |
2201 | * have to propagate any other updates to the superblock on disk at this |
2202 | * point. Just start an async writeback to get the buffers on their way | |
2203 | * to the disk. | |
2204 | * | |
2205 | * This implicitly triggers the writebehind on sync(). | |
2206 | */ | |
2207 | ||
617ba13b | 2208 | static void ext4_write_super (struct super_block * sb) |
ac27a0ec DK |
2209 | { |
2210 | if (mutex_trylock(&sb->s_lock) != 0) | |
2211 | BUG(); | |
2212 | sb->s_dirt = 0; | |
2213 | } | |
2214 | ||
617ba13b | 2215 | static int ext4_sync_fs(struct super_block *sb, int wait) |
ac27a0ec DK |
2216 | { |
2217 | tid_t target; | |
2218 | ||
2219 | sb->s_dirt = 0; | |
617ba13b | 2220 | if (journal_start_commit(EXT4_SB(sb)->s_journal, &target)) { |
ac27a0ec | 2221 | if (wait) |
617ba13b | 2222 | log_wait_commit(EXT4_SB(sb)->s_journal, target); |
ac27a0ec DK |
2223 | } |
2224 | return 0; | |
2225 | } | |
2226 | ||
2227 | /* | |
2228 | * LVM calls this function before a (read-only) snapshot is created. This | |
2229 | * gives us a chance to flush the journal completely and mark the fs clean. | |
2230 | */ | |
617ba13b | 2231 | static void ext4_write_super_lockfs(struct super_block *sb) |
ac27a0ec DK |
2232 | { |
2233 | sb->s_dirt = 0; | |
2234 | ||
2235 | if (!(sb->s_flags & MS_RDONLY)) { | |
617ba13b | 2236 | journal_t *journal = EXT4_SB(sb)->s_journal; |
ac27a0ec DK |
2237 | |
2238 | /* Now we set up the journal barrier. */ | |
2239 | journal_lock_updates(journal); | |
2240 | journal_flush(journal); | |
2241 | ||
2242 | /* Journal blocked and flushed, clear needs_recovery flag. */ | |
617ba13b MC |
2243 | EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); |
2244 | ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1); | |
ac27a0ec DK |
2245 | } |
2246 | } | |
2247 | ||
2248 | /* | |
2249 | * Called by LVM after the snapshot is done. We need to reset the RECOVER | |
2250 | * flag here, even though the filesystem is not technically dirty yet. | |
2251 | */ | |
617ba13b | 2252 | static void ext4_unlockfs(struct super_block *sb) |
ac27a0ec DK |
2253 | { |
2254 | if (!(sb->s_flags & MS_RDONLY)) { | |
2255 | lock_super(sb); | |
2256 | /* Reser the needs_recovery flag before the fs is unlocked. */ | |
617ba13b MC |
2257 | EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); |
2258 | ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1); | |
ac27a0ec | 2259 | unlock_super(sb); |
617ba13b | 2260 | journal_unlock_updates(EXT4_SB(sb)->s_journal); |
ac27a0ec DK |
2261 | } |
2262 | } | |
2263 | ||
617ba13b | 2264 | static int ext4_remount (struct super_block * sb, int * flags, char * data) |
ac27a0ec | 2265 | { |
617ba13b MC |
2266 | struct ext4_super_block * es; |
2267 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
2268 | ext4_fsblk_t n_blocks_count = 0; | |
ac27a0ec | 2269 | unsigned long old_sb_flags; |
617ba13b | 2270 | struct ext4_mount_options old_opts; |
ac27a0ec DK |
2271 | int err; |
2272 | #ifdef CONFIG_QUOTA | |
2273 | int i; | |
2274 | #endif | |
2275 | ||
2276 | /* Store the original options */ | |
2277 | old_sb_flags = sb->s_flags; | |
2278 | old_opts.s_mount_opt = sbi->s_mount_opt; | |
2279 | old_opts.s_resuid = sbi->s_resuid; | |
2280 | old_opts.s_resgid = sbi->s_resgid; | |
2281 | old_opts.s_commit_interval = sbi->s_commit_interval; | |
2282 | #ifdef CONFIG_QUOTA | |
2283 | old_opts.s_jquota_fmt = sbi->s_jquota_fmt; | |
2284 | for (i = 0; i < MAXQUOTAS; i++) | |
2285 | old_opts.s_qf_names[i] = sbi->s_qf_names[i]; | |
2286 | #endif | |
2287 | ||
2288 | /* | |
2289 | * Allow the "check" option to be passed as a remount option. | |
2290 | */ | |
2291 | if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) { | |
2292 | err = -EINVAL; | |
2293 | goto restore_opts; | |
2294 | } | |
2295 | ||
617ba13b MC |
2296 | if (sbi->s_mount_opt & EXT4_MOUNT_ABORT) |
2297 | ext4_abort(sb, __FUNCTION__, "Abort forced by user"); | |
ac27a0ec DK |
2298 | |
2299 | sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | | |
617ba13b | 2300 | ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0); |
ac27a0ec DK |
2301 | |
2302 | es = sbi->s_es; | |
2303 | ||
617ba13b | 2304 | ext4_init_journal_params(sb, sbi->s_journal); |
ac27a0ec DK |
2305 | |
2306 | if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) || | |
2307 | n_blocks_count > le32_to_cpu(es->s_blocks_count)) { | |
617ba13b | 2308 | if (sbi->s_mount_opt & EXT4_MOUNT_ABORT) { |
ac27a0ec DK |
2309 | err = -EROFS; |
2310 | goto restore_opts; | |
2311 | } | |
2312 | ||
2313 | if (*flags & MS_RDONLY) { | |
2314 | /* | |
2315 | * First of all, the unconditional stuff we have to do | |
2316 | * to disable replay of the journal when we next remount | |
2317 | */ | |
2318 | sb->s_flags |= MS_RDONLY; | |
2319 | ||
2320 | /* | |
2321 | * OK, test if we are remounting a valid rw partition | |
2322 | * readonly, and if so set the rdonly flag and then | |
2323 | * mark the partition as valid again. | |
2324 | */ | |
617ba13b MC |
2325 | if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) && |
2326 | (sbi->s_mount_state & EXT4_VALID_FS)) | |
ac27a0ec DK |
2327 | es->s_state = cpu_to_le16(sbi->s_mount_state); |
2328 | ||
617ba13b | 2329 | ext4_mark_recovery_complete(sb, es); |
ac27a0ec DK |
2330 | } else { |
2331 | __le32 ret; | |
617ba13b MC |
2332 | if ((ret = EXT4_HAS_RO_COMPAT_FEATURE(sb, |
2333 | ~EXT4_FEATURE_RO_COMPAT_SUPP))) { | |
2334 | printk(KERN_WARNING "EXT4-fs: %s: couldn't " | |
ac27a0ec DK |
2335 | "remount RDWR because of unsupported " |
2336 | "optional features (%x).\n", | |
2337 | sb->s_id, le32_to_cpu(ret)); | |
2338 | err = -EROFS; | |
2339 | goto restore_opts; | |
2340 | } | |
2341 | /* | |
2342 | * Mounting a RDONLY partition read-write, so reread | |
2343 | * and store the current valid flag. (It may have | |
2344 | * been changed by e2fsck since we originally mounted | |
2345 | * the partition.) | |
2346 | */ | |
617ba13b | 2347 | ext4_clear_journal_err(sb, es); |
ac27a0ec | 2348 | sbi->s_mount_state = le16_to_cpu(es->s_state); |
617ba13b | 2349 | if ((err = ext4_group_extend(sb, es, n_blocks_count))) |
ac27a0ec | 2350 | goto restore_opts; |
617ba13b | 2351 | if (!ext4_setup_super (sb, es, 0)) |
ac27a0ec DK |
2352 | sb->s_flags &= ~MS_RDONLY; |
2353 | } | |
2354 | } | |
2355 | #ifdef CONFIG_QUOTA | |
2356 | /* Release old quota file names */ | |
2357 | for (i = 0; i < MAXQUOTAS; i++) | |
2358 | if (old_opts.s_qf_names[i] && | |
2359 | old_opts.s_qf_names[i] != sbi->s_qf_names[i]) | |
2360 | kfree(old_opts.s_qf_names[i]); | |
2361 | #endif | |
2362 | return 0; | |
2363 | restore_opts: | |
2364 | sb->s_flags = old_sb_flags; | |
2365 | sbi->s_mount_opt = old_opts.s_mount_opt; | |
2366 | sbi->s_resuid = old_opts.s_resuid; | |
2367 | sbi->s_resgid = old_opts.s_resgid; | |
2368 | sbi->s_commit_interval = old_opts.s_commit_interval; | |
2369 | #ifdef CONFIG_QUOTA | |
2370 | sbi->s_jquota_fmt = old_opts.s_jquota_fmt; | |
2371 | for (i = 0; i < MAXQUOTAS; i++) { | |
2372 | if (sbi->s_qf_names[i] && | |
2373 | old_opts.s_qf_names[i] != sbi->s_qf_names[i]) | |
2374 | kfree(sbi->s_qf_names[i]); | |
2375 | sbi->s_qf_names[i] = old_opts.s_qf_names[i]; | |
2376 | } | |
2377 | #endif | |
2378 | return err; | |
2379 | } | |
2380 | ||
617ba13b | 2381 | static int ext4_statfs (struct dentry * dentry, struct kstatfs * buf) |
ac27a0ec DK |
2382 | { |
2383 | struct super_block *sb = dentry->d_sb; | |
617ba13b MC |
2384 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
2385 | struct ext4_super_block *es = sbi->s_es; | |
2386 | ext4_fsblk_t overhead; | |
ac27a0ec DK |
2387 | int i; |
2388 | ||
2389 | if (test_opt (sb, MINIX_DF)) | |
2390 | overhead = 0; | |
2391 | else { | |
2392 | unsigned long ngroups; | |
617ba13b | 2393 | ngroups = EXT4_SB(sb)->s_groups_count; |
ac27a0ec DK |
2394 | smp_rmb(); |
2395 | ||
2396 | /* | |
2397 | * Compute the overhead (FS structures) | |
2398 | */ | |
2399 | ||
2400 | /* | |
2401 | * All of the blocks before first_data_block are | |
2402 | * overhead | |
2403 | */ | |
2404 | overhead = le32_to_cpu(es->s_first_data_block); | |
2405 | ||
2406 | /* | |
2407 | * Add the overhead attributed to the superblock and | |
2408 | * block group descriptors. If the sparse superblocks | |
2409 | * feature is turned on, then not all groups have this. | |
2410 | */ | |
2411 | for (i = 0; i < ngroups; i++) { | |
617ba13b MC |
2412 | overhead += ext4_bg_has_super(sb, i) + |
2413 | ext4_bg_num_gdb(sb, i); | |
ac27a0ec DK |
2414 | cond_resched(); |
2415 | } | |
2416 | ||
2417 | /* | |
2418 | * Every block group has an inode bitmap, a block | |
2419 | * bitmap, and an inode table. | |
2420 | */ | |
617ba13b | 2421 | overhead += (ngroups * (2 + EXT4_SB(sb)->s_itb_per_group)); |
ac27a0ec DK |
2422 | } |
2423 | ||
617ba13b | 2424 | buf->f_type = EXT4_SUPER_MAGIC; |
ac27a0ec DK |
2425 | buf->f_bsize = sb->s_blocksize; |
2426 | buf->f_blocks = le32_to_cpu(es->s_blocks_count) - overhead; | |
2427 | buf->f_bfree = percpu_counter_sum(&sbi->s_freeblocks_counter); | |
2428 | buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count); | |
2429 | if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count)) | |
2430 | buf->f_bavail = 0; | |
2431 | buf->f_files = le32_to_cpu(es->s_inodes_count); | |
2432 | buf->f_ffree = percpu_counter_sum(&sbi->s_freeinodes_counter); | |
617ba13b | 2433 | buf->f_namelen = EXT4_NAME_LEN; |
ac27a0ec DK |
2434 | return 0; |
2435 | } | |
2436 | ||
2437 | /* Helper function for writing quotas on sync - we need to start transaction before quota file | |
2438 | * is locked for write. Otherwise the are possible deadlocks: | |
2439 | * Process 1 Process 2 | |
617ba13b | 2440 | * ext4_create() quota_sync() |
ac27a0ec DK |
2441 | * journal_start() write_dquot() |
2442 | * DQUOT_INIT() down(dqio_mutex) | |
2443 | * down(dqio_mutex) journal_start() | |
2444 | * | |
2445 | */ | |
2446 | ||
2447 | #ifdef CONFIG_QUOTA | |
2448 | ||
2449 | static inline struct inode *dquot_to_inode(struct dquot *dquot) | |
2450 | { | |
2451 | return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type]; | |
2452 | } | |
2453 | ||
617ba13b | 2454 | static int ext4_dquot_initialize(struct inode *inode, int type) |
ac27a0ec DK |
2455 | { |
2456 | handle_t *handle; | |
2457 | int ret, err; | |
2458 | ||
2459 | /* We may create quota structure so we need to reserve enough blocks */ | |
617ba13b | 2460 | handle = ext4_journal_start(inode, 2*EXT4_QUOTA_INIT_BLOCKS(inode->i_sb)); |
ac27a0ec DK |
2461 | if (IS_ERR(handle)) |
2462 | return PTR_ERR(handle); | |
2463 | ret = dquot_initialize(inode, type); | |
617ba13b | 2464 | err = ext4_journal_stop(handle); |
ac27a0ec DK |
2465 | if (!ret) |
2466 | ret = err; | |
2467 | return ret; | |
2468 | } | |
2469 | ||
617ba13b | 2470 | static int ext4_dquot_drop(struct inode *inode) |
ac27a0ec DK |
2471 | { |
2472 | handle_t *handle; | |
2473 | int ret, err; | |
2474 | ||
2475 | /* We may delete quota structure so we need to reserve enough blocks */ | |
617ba13b | 2476 | handle = ext4_journal_start(inode, 2*EXT4_QUOTA_DEL_BLOCKS(inode->i_sb)); |
ac27a0ec DK |
2477 | if (IS_ERR(handle)) |
2478 | return PTR_ERR(handle); | |
2479 | ret = dquot_drop(inode); | |
617ba13b | 2480 | err = ext4_journal_stop(handle); |
ac27a0ec DK |
2481 | if (!ret) |
2482 | ret = err; | |
2483 | return ret; | |
2484 | } | |
2485 | ||
617ba13b | 2486 | static int ext4_write_dquot(struct dquot *dquot) |
ac27a0ec DK |
2487 | { |
2488 | int ret, err; | |
2489 | handle_t *handle; | |
2490 | struct inode *inode; | |
2491 | ||
2492 | inode = dquot_to_inode(dquot); | |
617ba13b MC |
2493 | handle = ext4_journal_start(inode, |
2494 | EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb)); | |
ac27a0ec DK |
2495 | if (IS_ERR(handle)) |
2496 | return PTR_ERR(handle); | |
2497 | ret = dquot_commit(dquot); | |
617ba13b | 2498 | err = ext4_journal_stop(handle); |
ac27a0ec DK |
2499 | if (!ret) |
2500 | ret = err; | |
2501 | return ret; | |
2502 | } | |
2503 | ||
617ba13b | 2504 | static int ext4_acquire_dquot(struct dquot *dquot) |
ac27a0ec DK |
2505 | { |
2506 | int ret, err; | |
2507 | handle_t *handle; | |
2508 | ||
617ba13b MC |
2509 | handle = ext4_journal_start(dquot_to_inode(dquot), |
2510 | EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb)); | |
ac27a0ec DK |
2511 | if (IS_ERR(handle)) |
2512 | return PTR_ERR(handle); | |
2513 | ret = dquot_acquire(dquot); | |
617ba13b | 2514 | err = ext4_journal_stop(handle); |
ac27a0ec DK |
2515 | if (!ret) |
2516 | ret = err; | |
2517 | return ret; | |
2518 | } | |
2519 | ||
617ba13b | 2520 | static int ext4_release_dquot(struct dquot *dquot) |
ac27a0ec DK |
2521 | { |
2522 | int ret, err; | |
2523 | handle_t *handle; | |
2524 | ||
617ba13b MC |
2525 | handle = ext4_journal_start(dquot_to_inode(dquot), |
2526 | EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb)); | |
ac27a0ec DK |
2527 | if (IS_ERR(handle)) |
2528 | return PTR_ERR(handle); | |
2529 | ret = dquot_release(dquot); | |
617ba13b | 2530 | err = ext4_journal_stop(handle); |
ac27a0ec DK |
2531 | if (!ret) |
2532 | ret = err; | |
2533 | return ret; | |
2534 | } | |
2535 | ||
617ba13b | 2536 | static int ext4_mark_dquot_dirty(struct dquot *dquot) |
ac27a0ec DK |
2537 | { |
2538 | /* Are we journalling quotas? */ | |
617ba13b MC |
2539 | if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] || |
2540 | EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) { | |
ac27a0ec | 2541 | dquot_mark_dquot_dirty(dquot); |
617ba13b | 2542 | return ext4_write_dquot(dquot); |
ac27a0ec DK |
2543 | } else { |
2544 | return dquot_mark_dquot_dirty(dquot); | |
2545 | } | |
2546 | } | |
2547 | ||
617ba13b | 2548 | static int ext4_write_info(struct super_block *sb, int type) |
ac27a0ec DK |
2549 | { |
2550 | int ret, err; | |
2551 | handle_t *handle; | |
2552 | ||
2553 | /* Data block + inode block */ | |
617ba13b | 2554 | handle = ext4_journal_start(sb->s_root->d_inode, 2); |
ac27a0ec DK |
2555 | if (IS_ERR(handle)) |
2556 | return PTR_ERR(handle); | |
2557 | ret = dquot_commit_info(sb, type); | |
617ba13b | 2558 | err = ext4_journal_stop(handle); |
ac27a0ec DK |
2559 | if (!ret) |
2560 | ret = err; | |
2561 | return ret; | |
2562 | } | |
2563 | ||
2564 | /* | |
2565 | * Turn on quotas during mount time - we need to find | |
2566 | * the quota file and such... | |
2567 | */ | |
617ba13b | 2568 | static int ext4_quota_on_mount(struct super_block *sb, int type) |
ac27a0ec | 2569 | { |
617ba13b MC |
2570 | return vfs_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type], |
2571 | EXT4_SB(sb)->s_jquota_fmt, type); | |
ac27a0ec DK |
2572 | } |
2573 | ||
2574 | /* | |
2575 | * Standard function to be called on quota_on | |
2576 | */ | |
617ba13b | 2577 | static int ext4_quota_on(struct super_block *sb, int type, int format_id, |
ac27a0ec DK |
2578 | char *path) |
2579 | { | |
2580 | int err; | |
2581 | struct nameidata nd; | |
2582 | ||
2583 | if (!test_opt(sb, QUOTA)) | |
2584 | return -EINVAL; | |
2585 | /* Not journalling quota? */ | |
617ba13b MC |
2586 | if (!EXT4_SB(sb)->s_qf_names[USRQUOTA] && |
2587 | !EXT4_SB(sb)->s_qf_names[GRPQUOTA]) | |
ac27a0ec DK |
2588 | return vfs_quota_on(sb, type, format_id, path); |
2589 | err = path_lookup(path, LOOKUP_FOLLOW, &nd); | |
2590 | if (err) | |
2591 | return err; | |
2592 | /* Quotafile not on the same filesystem? */ | |
2593 | if (nd.mnt->mnt_sb != sb) { | |
2594 | path_release(&nd); | |
2595 | return -EXDEV; | |
2596 | } | |
2597 | /* Quotafile not of fs root? */ | |
2598 | if (nd.dentry->d_parent->d_inode != sb->s_root->d_inode) | |
2599 | printk(KERN_WARNING | |
617ba13b | 2600 | "EXT4-fs: Quota file not on filesystem root. " |
ac27a0ec DK |
2601 | "Journalled quota will not work.\n"); |
2602 | path_release(&nd); | |
2603 | return vfs_quota_on(sb, type, format_id, path); | |
2604 | } | |
2605 | ||
2606 | /* Read data from quotafile - avoid pagecache and such because we cannot afford | |
2607 | * acquiring the locks... As quota files are never truncated and quota code | |
2608 | * itself serializes the operations (and noone else should touch the files) | |
2609 | * we don't have to be afraid of races */ | |
617ba13b | 2610 | static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data, |
ac27a0ec DK |
2611 | size_t len, loff_t off) |
2612 | { | |
2613 | struct inode *inode = sb_dqopt(sb)->files[type]; | |
617ba13b | 2614 | sector_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb); |
ac27a0ec DK |
2615 | int err = 0; |
2616 | int offset = off & (sb->s_blocksize - 1); | |
2617 | int tocopy; | |
2618 | size_t toread; | |
2619 | struct buffer_head *bh; | |
2620 | loff_t i_size = i_size_read(inode); | |
2621 | ||
2622 | if (off > i_size) | |
2623 | return 0; | |
2624 | if (off+len > i_size) | |
2625 | len = i_size-off; | |
2626 | toread = len; | |
2627 | while (toread > 0) { | |
2628 | tocopy = sb->s_blocksize - offset < toread ? | |
2629 | sb->s_blocksize - offset : toread; | |
617ba13b | 2630 | bh = ext4_bread(NULL, inode, blk, 0, &err); |
ac27a0ec DK |
2631 | if (err) |
2632 | return err; | |
2633 | if (!bh) /* A hole? */ | |
2634 | memset(data, 0, tocopy); | |
2635 | else | |
2636 | memcpy(data, bh->b_data+offset, tocopy); | |
2637 | brelse(bh); | |
2638 | offset = 0; | |
2639 | toread -= tocopy; | |
2640 | data += tocopy; | |
2641 | blk++; | |
2642 | } | |
2643 | return len; | |
2644 | } | |
2645 | ||
2646 | /* Write to quotafile (we know the transaction is already started and has | |
2647 | * enough credits) */ | |
617ba13b | 2648 | static ssize_t ext4_quota_write(struct super_block *sb, int type, |
ac27a0ec DK |
2649 | const char *data, size_t len, loff_t off) |
2650 | { | |
2651 | struct inode *inode = sb_dqopt(sb)->files[type]; | |
617ba13b | 2652 | sector_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb); |
ac27a0ec DK |
2653 | int err = 0; |
2654 | int offset = off & (sb->s_blocksize - 1); | |
2655 | int tocopy; | |
617ba13b | 2656 | int journal_quota = EXT4_SB(sb)->s_qf_names[type] != NULL; |
ac27a0ec DK |
2657 | size_t towrite = len; |
2658 | struct buffer_head *bh; | |
2659 | handle_t *handle = journal_current_handle(); | |
2660 | ||
2661 | mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA); | |
2662 | while (towrite > 0) { | |
2663 | tocopy = sb->s_blocksize - offset < towrite ? | |
2664 | sb->s_blocksize - offset : towrite; | |
617ba13b | 2665 | bh = ext4_bread(handle, inode, blk, 1, &err); |
ac27a0ec DK |
2666 | if (!bh) |
2667 | goto out; | |
2668 | if (journal_quota) { | |
617ba13b | 2669 | err = ext4_journal_get_write_access(handle, bh); |
ac27a0ec DK |
2670 | if (err) { |
2671 | brelse(bh); | |
2672 | goto out; | |
2673 | } | |
2674 | } | |
2675 | lock_buffer(bh); | |
2676 | memcpy(bh->b_data+offset, data, tocopy); | |
2677 | flush_dcache_page(bh->b_page); | |
2678 | unlock_buffer(bh); | |
2679 | if (journal_quota) | |
617ba13b | 2680 | err = ext4_journal_dirty_metadata(handle, bh); |
ac27a0ec DK |
2681 | else { |
2682 | /* Always do at least ordered writes for quotas */ | |
617ba13b | 2683 | err = ext4_journal_dirty_data(handle, bh); |
ac27a0ec DK |
2684 | mark_buffer_dirty(bh); |
2685 | } | |
2686 | brelse(bh); | |
2687 | if (err) | |
2688 | goto out; | |
2689 | offset = 0; | |
2690 | towrite -= tocopy; | |
2691 | data += tocopy; | |
2692 | blk++; | |
2693 | } | |
2694 | out: | |
2695 | if (len == towrite) | |
2696 | return err; | |
2697 | if (inode->i_size < off+len-towrite) { | |
2698 | i_size_write(inode, off+len-towrite); | |
617ba13b | 2699 | EXT4_I(inode)->i_disksize = inode->i_size; |
ac27a0ec DK |
2700 | } |
2701 | inode->i_version++; | |
2702 | inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
617ba13b | 2703 | ext4_mark_inode_dirty(handle, inode); |
ac27a0ec DK |
2704 | mutex_unlock(&inode->i_mutex); |
2705 | return len - towrite; | |
2706 | } | |
2707 | ||
2708 | #endif | |
2709 | ||
617ba13b | 2710 | static int ext4_get_sb(struct file_system_type *fs_type, |
ac27a0ec DK |
2711 | int flags, const char *dev_name, void *data, struct vfsmount *mnt) |
2712 | { | |
617ba13b | 2713 | return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super, mnt); |
ac27a0ec DK |
2714 | } |
2715 | ||
617ba13b | 2716 | static struct file_system_type ext4dev_fs_type = { |
ac27a0ec | 2717 | .owner = THIS_MODULE, |
617ba13b MC |
2718 | .name = "ext4dev", |
2719 | .get_sb = ext4_get_sb, | |
ac27a0ec DK |
2720 | .kill_sb = kill_block_super, |
2721 | .fs_flags = FS_REQUIRES_DEV, | |
2722 | }; | |
2723 | ||
617ba13b | 2724 | static int __init init_ext4_fs(void) |
ac27a0ec | 2725 | { |
617ba13b | 2726 | int err = init_ext4_xattr(); |
ac27a0ec DK |
2727 | if (err) |
2728 | return err; | |
2729 | err = init_inodecache(); | |
2730 | if (err) | |
2731 | goto out1; | |
617ba13b | 2732 | err = register_filesystem(&ext4dev_fs_type); |
ac27a0ec DK |
2733 | if (err) |
2734 | goto out; | |
2735 | return 0; | |
2736 | out: | |
2737 | destroy_inodecache(); | |
2738 | out1: | |
617ba13b | 2739 | exit_ext4_xattr(); |
ac27a0ec DK |
2740 | return err; |
2741 | } | |
2742 | ||
617ba13b | 2743 | static void __exit exit_ext4_fs(void) |
ac27a0ec | 2744 | { |
617ba13b | 2745 | unregister_filesystem(&ext4dev_fs_type); |
ac27a0ec | 2746 | destroy_inodecache(); |
617ba13b | 2747 | exit_ext4_xattr(); |
ac27a0ec DK |
2748 | } |
2749 | ||
2750 | MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others"); | |
617ba13b | 2751 | MODULE_DESCRIPTION("Fourth Extended Filesystem with extents"); |
ac27a0ec | 2752 | MODULE_LICENSE("GPL"); |
617ba13b MC |
2753 | module_init(init_ext4_fs) |
2754 | module_exit(exit_ext4_fs) |