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Commit | Line | Data |
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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> | |
dab291af | 23 | #include <linux/jbd2.h> |
617ba13b | 24 | #include <linux/ext4_fs.h> |
dab291af | 25 | #include <linux/ext4_jbd2.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> | |
a5694255 | 32 | #include <linux/exportfs.h> |
ac27a0ec DK |
33 | #include <linux/vfs.h> |
34 | #include <linux/random.h> | |
35 | #include <linux/mount.h> | |
36 | #include <linux/namei.h> | |
37 | #include <linux/quotaops.h> | |
38 | #include <linux/seq_file.h> | |
1330593e | 39 | #include <linux/log2.h> |
ac27a0ec DK |
40 | |
41 | #include <asm/uaccess.h> | |
42 | ||
43 | #include "xattr.h" | |
44 | #include "acl.h" | |
45 | #include "namei.h" | |
46 | ||
617ba13b | 47 | static int ext4_load_journal(struct super_block *, struct ext4_super_block *, |
ac27a0ec | 48 | unsigned long journal_devnum); |
617ba13b | 49 | static int ext4_create_journal(struct super_block *, struct ext4_super_block *, |
ac27a0ec | 50 | unsigned int); |
617ba13b MC |
51 | static void ext4_commit_super (struct super_block * sb, |
52 | struct ext4_super_block * es, | |
ac27a0ec | 53 | int sync); |
617ba13b MC |
54 | static void ext4_mark_recovery_complete(struct super_block * sb, |
55 | struct ext4_super_block * es); | |
56 | static void ext4_clear_journal_err(struct super_block * sb, | |
57 | struct ext4_super_block * es); | |
58 | static int ext4_sync_fs(struct super_block *sb, int wait); | |
59 | static const char *ext4_decode_error(struct super_block * sb, int errno, | |
ac27a0ec | 60 | char nbuf[16]); |
617ba13b MC |
61 | static int ext4_remount (struct super_block * sb, int * flags, char * data); |
62 | static int ext4_statfs (struct dentry * dentry, struct kstatfs * buf); | |
63 | static void ext4_unlockfs(struct super_block *sb); | |
64 | static void ext4_write_super (struct super_block * sb); | |
65 | static void ext4_write_super_lockfs(struct super_block *sb); | |
ac27a0ec | 66 | |
bd81d8ee | 67 | |
8fadc143 AR |
68 | ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, |
69 | struct ext4_group_desc *bg) | |
bd81d8ee LV |
70 | { |
71 | return le32_to_cpu(bg->bg_block_bitmap) | | |
8fadc143 AR |
72 | (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? |
73 | (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0); | |
bd81d8ee LV |
74 | } |
75 | ||
8fadc143 AR |
76 | ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, |
77 | struct ext4_group_desc *bg) | |
bd81d8ee LV |
78 | { |
79 | return le32_to_cpu(bg->bg_inode_bitmap) | | |
8fadc143 AR |
80 | (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? |
81 | (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0); | |
bd81d8ee LV |
82 | } |
83 | ||
8fadc143 AR |
84 | ext4_fsblk_t ext4_inode_table(struct super_block *sb, |
85 | struct ext4_group_desc *bg) | |
bd81d8ee LV |
86 | { |
87 | return le32_to_cpu(bg->bg_inode_table) | | |
8fadc143 AR |
88 | (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? |
89 | (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0); | |
bd81d8ee LV |
90 | } |
91 | ||
8fadc143 AR |
92 | void ext4_block_bitmap_set(struct super_block *sb, |
93 | struct ext4_group_desc *bg, ext4_fsblk_t blk) | |
bd81d8ee LV |
94 | { |
95 | bg->bg_block_bitmap = cpu_to_le32((u32)blk); | |
8fadc143 AR |
96 | if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) |
97 | bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32); | |
bd81d8ee LV |
98 | } |
99 | ||
8fadc143 AR |
100 | void ext4_inode_bitmap_set(struct super_block *sb, |
101 | struct ext4_group_desc *bg, ext4_fsblk_t blk) | |
bd81d8ee LV |
102 | { |
103 | bg->bg_inode_bitmap = cpu_to_le32((u32)blk); | |
8fadc143 AR |
104 | if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) |
105 | bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32); | |
bd81d8ee LV |
106 | } |
107 | ||
8fadc143 AR |
108 | void ext4_inode_table_set(struct super_block *sb, |
109 | struct ext4_group_desc *bg, ext4_fsblk_t blk) | |
bd81d8ee LV |
110 | { |
111 | bg->bg_inode_table = cpu_to_le32((u32)blk); | |
8fadc143 AR |
112 | if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) |
113 | bg->bg_inode_table_hi = cpu_to_le32(blk >> 32); | |
bd81d8ee LV |
114 | } |
115 | ||
ac27a0ec | 116 | /* |
dab291af | 117 | * Wrappers for jbd2_journal_start/end. |
ac27a0ec DK |
118 | * |
119 | * The only special thing we need to do here is to make sure that all | |
120 | * journal_end calls result in the superblock being marked dirty, so | |
121 | * that sync() will call the filesystem's write_super callback if | |
122 | * appropriate. | |
123 | */ | |
617ba13b | 124 | handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks) |
ac27a0ec DK |
125 | { |
126 | journal_t *journal; | |
127 | ||
128 | if (sb->s_flags & MS_RDONLY) | |
129 | return ERR_PTR(-EROFS); | |
130 | ||
131 | /* Special case here: if the journal has aborted behind our | |
132 | * backs (eg. EIO in the commit thread), then we still need to | |
133 | * take the FS itself readonly cleanly. */ | |
617ba13b | 134 | journal = EXT4_SB(sb)->s_journal; |
ac27a0ec | 135 | if (is_journal_aborted(journal)) { |
617ba13b | 136 | ext4_abort(sb, __FUNCTION__, |
ac27a0ec DK |
137 | "Detected aborted journal"); |
138 | return ERR_PTR(-EROFS); | |
139 | } | |
140 | ||
dab291af | 141 | return jbd2_journal_start(journal, nblocks); |
ac27a0ec DK |
142 | } |
143 | ||
144 | /* | |
145 | * The only special thing we need to do here is to make sure that all | |
dab291af | 146 | * jbd2_journal_stop calls result in the superblock being marked dirty, so |
ac27a0ec DK |
147 | * that sync() will call the filesystem's write_super callback if |
148 | * appropriate. | |
149 | */ | |
617ba13b | 150 | int __ext4_journal_stop(const char *where, handle_t *handle) |
ac27a0ec DK |
151 | { |
152 | struct super_block *sb; | |
153 | int err; | |
154 | int rc; | |
155 | ||
156 | sb = handle->h_transaction->t_journal->j_private; | |
157 | err = handle->h_err; | |
dab291af | 158 | rc = jbd2_journal_stop(handle); |
ac27a0ec DK |
159 | |
160 | if (!err) | |
161 | err = rc; | |
162 | if (err) | |
617ba13b | 163 | __ext4_std_error(sb, where, err); |
ac27a0ec DK |
164 | return err; |
165 | } | |
166 | ||
617ba13b | 167 | void ext4_journal_abort_handle(const char *caller, const char *err_fn, |
ac27a0ec DK |
168 | struct buffer_head *bh, handle_t *handle, int err) |
169 | { | |
170 | char nbuf[16]; | |
617ba13b | 171 | const char *errstr = ext4_decode_error(NULL, err, nbuf); |
ac27a0ec DK |
172 | |
173 | if (bh) | |
174 | BUFFER_TRACE(bh, "abort"); | |
175 | ||
176 | if (!handle->h_err) | |
177 | handle->h_err = err; | |
178 | ||
179 | if (is_handle_aborted(handle)) | |
180 | return; | |
181 | ||
182 | printk(KERN_ERR "%s: aborting transaction: %s in %s\n", | |
183 | caller, errstr, err_fn); | |
184 | ||
dab291af | 185 | jbd2_journal_abort_handle(handle); |
ac27a0ec DK |
186 | } |
187 | ||
188 | /* Deal with the reporting of failure conditions on a filesystem such as | |
189 | * inconsistencies detected or read IO failures. | |
190 | * | |
191 | * On ext2, we can store the error state of the filesystem in the | |
617ba13b | 192 | * superblock. That is not possible on ext4, because we may have other |
ac27a0ec DK |
193 | * write ordering constraints on the superblock which prevent us from |
194 | * writing it out straight away; and given that the journal is about to | |
195 | * be aborted, we can't rely on the current, or future, transactions to | |
196 | * write out the superblock safely. | |
197 | * | |
dab291af | 198 | * We'll just use the jbd2_journal_abort() error code to record an error in |
ac27a0ec DK |
199 | * the journal instead. On recovery, the journal will compain about |
200 | * that error until we've noted it down and cleared it. | |
201 | */ | |
202 | ||
617ba13b | 203 | static void ext4_handle_error(struct super_block *sb) |
ac27a0ec | 204 | { |
617ba13b | 205 | struct ext4_super_block *es = EXT4_SB(sb)->s_es; |
ac27a0ec | 206 | |
617ba13b MC |
207 | EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; |
208 | es->s_state |= cpu_to_le16(EXT4_ERROR_FS); | |
ac27a0ec DK |
209 | |
210 | if (sb->s_flags & MS_RDONLY) | |
211 | return; | |
212 | ||
213 | if (!test_opt (sb, ERRORS_CONT)) { | |
617ba13b | 214 | journal_t *journal = EXT4_SB(sb)->s_journal; |
ac27a0ec | 215 | |
617ba13b | 216 | EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT; |
ac27a0ec | 217 | if (journal) |
dab291af | 218 | jbd2_journal_abort(journal, -EIO); |
ac27a0ec DK |
219 | } |
220 | if (test_opt (sb, ERRORS_RO)) { | |
221 | printk (KERN_CRIT "Remounting filesystem read-only\n"); | |
222 | sb->s_flags |= MS_RDONLY; | |
223 | } | |
617ba13b | 224 | ext4_commit_super(sb, es, 1); |
ac27a0ec | 225 | if (test_opt(sb, ERRORS_PANIC)) |
617ba13b | 226 | panic("EXT4-fs (device %s): panic forced after error\n", |
ac27a0ec DK |
227 | sb->s_id); |
228 | } | |
229 | ||
617ba13b | 230 | void ext4_error (struct super_block * sb, const char * function, |
ac27a0ec DK |
231 | const char * fmt, ...) |
232 | { | |
233 | va_list args; | |
234 | ||
235 | va_start(args, fmt); | |
617ba13b | 236 | printk(KERN_CRIT "EXT4-fs error (device %s): %s: ",sb->s_id, function); |
ac27a0ec DK |
237 | vprintk(fmt, args); |
238 | printk("\n"); | |
239 | va_end(args); | |
240 | ||
617ba13b | 241 | ext4_handle_error(sb); |
ac27a0ec DK |
242 | } |
243 | ||
617ba13b | 244 | static const char *ext4_decode_error(struct super_block * sb, int errno, |
ac27a0ec DK |
245 | char nbuf[16]) |
246 | { | |
247 | char *errstr = NULL; | |
248 | ||
249 | switch (errno) { | |
250 | case -EIO: | |
251 | errstr = "IO failure"; | |
252 | break; | |
253 | case -ENOMEM: | |
254 | errstr = "Out of memory"; | |
255 | break; | |
256 | case -EROFS: | |
dab291af | 257 | if (!sb || EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT) |
ac27a0ec DK |
258 | errstr = "Journal has aborted"; |
259 | else | |
260 | errstr = "Readonly filesystem"; | |
261 | break; | |
262 | default: | |
263 | /* If the caller passed in an extra buffer for unknown | |
264 | * errors, textualise them now. Else we just return | |
265 | * NULL. */ | |
266 | if (nbuf) { | |
267 | /* Check for truncated error codes... */ | |
268 | if (snprintf(nbuf, 16, "error %d", -errno) >= 0) | |
269 | errstr = nbuf; | |
270 | } | |
271 | break; | |
272 | } | |
273 | ||
274 | return errstr; | |
275 | } | |
276 | ||
617ba13b | 277 | /* __ext4_std_error decodes expected errors from journaling functions |
ac27a0ec DK |
278 | * automatically and invokes the appropriate error response. */ |
279 | ||
617ba13b | 280 | void __ext4_std_error (struct super_block * sb, const char * function, |
ac27a0ec DK |
281 | int errno) |
282 | { | |
283 | char nbuf[16]; | |
284 | const char *errstr; | |
285 | ||
286 | /* Special case: if the error is EROFS, and we're not already | |
287 | * inside a transaction, then there's really no point in logging | |
288 | * an error. */ | |
289 | if (errno == -EROFS && journal_current_handle() == NULL && | |
290 | (sb->s_flags & MS_RDONLY)) | |
291 | return; | |
292 | ||
617ba13b MC |
293 | errstr = ext4_decode_error(sb, errno, nbuf); |
294 | printk (KERN_CRIT "EXT4-fs error (device %s) in %s: %s\n", | |
ac27a0ec DK |
295 | sb->s_id, function, errstr); |
296 | ||
617ba13b | 297 | ext4_handle_error(sb); |
ac27a0ec DK |
298 | } |
299 | ||
300 | /* | |
617ba13b | 301 | * ext4_abort is a much stronger failure handler than ext4_error. The |
ac27a0ec DK |
302 | * abort function may be used to deal with unrecoverable failures such |
303 | * as journal IO errors or ENOMEM at a critical moment in log management. | |
304 | * | |
305 | * We unconditionally force the filesystem into an ABORT|READONLY state, | |
306 | * unless the error response on the fs has been set to panic in which | |
307 | * case we take the easy way out and panic immediately. | |
308 | */ | |
309 | ||
617ba13b | 310 | void ext4_abort (struct super_block * sb, const char * function, |
ac27a0ec DK |
311 | const char * fmt, ...) |
312 | { | |
313 | va_list args; | |
314 | ||
617ba13b | 315 | printk (KERN_CRIT "ext4_abort called.\n"); |
ac27a0ec DK |
316 | |
317 | va_start(args, fmt); | |
617ba13b | 318 | printk(KERN_CRIT "EXT4-fs error (device %s): %s: ",sb->s_id, function); |
ac27a0ec DK |
319 | vprintk(fmt, args); |
320 | printk("\n"); | |
321 | va_end(args); | |
322 | ||
323 | if (test_opt(sb, ERRORS_PANIC)) | |
617ba13b | 324 | panic("EXT4-fs panic from previous error\n"); |
ac27a0ec DK |
325 | |
326 | if (sb->s_flags & MS_RDONLY) | |
327 | return; | |
328 | ||
329 | printk(KERN_CRIT "Remounting filesystem read-only\n"); | |
617ba13b | 330 | EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; |
ac27a0ec | 331 | sb->s_flags |= MS_RDONLY; |
617ba13b | 332 | EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT; |
dab291af | 333 | jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO); |
ac27a0ec DK |
334 | } |
335 | ||
617ba13b | 336 | void ext4_warning (struct super_block * sb, const char * function, |
ac27a0ec DK |
337 | const char * fmt, ...) |
338 | { | |
339 | va_list args; | |
340 | ||
341 | va_start(args, fmt); | |
617ba13b | 342 | printk(KERN_WARNING "EXT4-fs warning (device %s): %s: ", |
ac27a0ec DK |
343 | sb->s_id, function); |
344 | vprintk(fmt, args); | |
345 | printk("\n"); | |
346 | va_end(args); | |
347 | } | |
348 | ||
617ba13b | 349 | void ext4_update_dynamic_rev(struct super_block *sb) |
ac27a0ec | 350 | { |
617ba13b | 351 | struct ext4_super_block *es = EXT4_SB(sb)->s_es; |
ac27a0ec | 352 | |
617ba13b | 353 | if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV) |
ac27a0ec DK |
354 | return; |
355 | ||
617ba13b | 356 | ext4_warning(sb, __FUNCTION__, |
ac27a0ec DK |
357 | "updating to rev %d because of new feature flag, " |
358 | "running e2fsck is recommended", | |
617ba13b | 359 | EXT4_DYNAMIC_REV); |
ac27a0ec | 360 | |
617ba13b MC |
361 | es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO); |
362 | es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE); | |
363 | es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV); | |
ac27a0ec DK |
364 | /* leave es->s_feature_*compat flags alone */ |
365 | /* es->s_uuid will be set by e2fsck if empty */ | |
366 | ||
367 | /* | |
368 | * The rest of the superblock fields should be zero, and if not it | |
369 | * means they are likely already in use, so leave them alone. We | |
370 | * can leave it up to e2fsck to clean up any inconsistencies there. | |
371 | */ | |
372 | } | |
373 | ||
374 | /* | |
375 | * Open the external journal device | |
376 | */ | |
617ba13b | 377 | static struct block_device *ext4_blkdev_get(dev_t dev) |
ac27a0ec DK |
378 | { |
379 | struct block_device *bdev; | |
380 | char b[BDEVNAME_SIZE]; | |
381 | ||
382 | bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE); | |
383 | if (IS_ERR(bdev)) | |
384 | goto fail; | |
385 | return bdev; | |
386 | ||
387 | fail: | |
617ba13b | 388 | printk(KERN_ERR "EXT4: failed to open journal device %s: %ld\n", |
ac27a0ec DK |
389 | __bdevname(dev, b), PTR_ERR(bdev)); |
390 | return NULL; | |
391 | } | |
392 | ||
393 | /* | |
394 | * Release the journal device | |
395 | */ | |
617ba13b | 396 | static int ext4_blkdev_put(struct block_device *bdev) |
ac27a0ec DK |
397 | { |
398 | bd_release(bdev); | |
399 | return blkdev_put(bdev); | |
400 | } | |
401 | ||
617ba13b | 402 | static int ext4_blkdev_remove(struct ext4_sb_info *sbi) |
ac27a0ec DK |
403 | { |
404 | struct block_device *bdev; | |
405 | int ret = -ENODEV; | |
406 | ||
407 | bdev = sbi->journal_bdev; | |
408 | if (bdev) { | |
617ba13b | 409 | ret = ext4_blkdev_put(bdev); |
ac27a0ec DK |
410 | sbi->journal_bdev = NULL; |
411 | } | |
412 | return ret; | |
413 | } | |
414 | ||
415 | static inline struct inode *orphan_list_entry(struct list_head *l) | |
416 | { | |
617ba13b | 417 | return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode; |
ac27a0ec DK |
418 | } |
419 | ||
617ba13b | 420 | static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi) |
ac27a0ec DK |
421 | { |
422 | struct list_head *l; | |
423 | ||
424 | printk(KERN_ERR "sb orphan head is %d\n", | |
425 | le32_to_cpu(sbi->s_es->s_last_orphan)); | |
426 | ||
427 | printk(KERN_ERR "sb_info orphan list:\n"); | |
428 | list_for_each(l, &sbi->s_orphan) { | |
429 | struct inode *inode = orphan_list_entry(l); | |
430 | printk(KERN_ERR " " | |
431 | "inode %s:%lu at %p: mode %o, nlink %d, next %d\n", | |
432 | inode->i_sb->s_id, inode->i_ino, inode, | |
433 | inode->i_mode, inode->i_nlink, | |
434 | NEXT_ORPHAN(inode)); | |
435 | } | |
436 | } | |
437 | ||
617ba13b | 438 | static void ext4_put_super (struct super_block * sb) |
ac27a0ec | 439 | { |
617ba13b MC |
440 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
441 | struct ext4_super_block *es = sbi->s_es; | |
ac27a0ec DK |
442 | int i; |
443 | ||
a86c6181 | 444 | ext4_ext_release(sb); |
617ba13b | 445 | ext4_xattr_put_super(sb); |
dab291af | 446 | jbd2_journal_destroy(sbi->s_journal); |
ac27a0ec | 447 | if (!(sb->s_flags & MS_RDONLY)) { |
617ba13b | 448 | EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); |
ac27a0ec DK |
449 | es->s_state = cpu_to_le16(sbi->s_mount_state); |
450 | BUFFER_TRACE(sbi->s_sbh, "marking dirty"); | |
451 | mark_buffer_dirty(sbi->s_sbh); | |
617ba13b | 452 | ext4_commit_super(sb, es, 1); |
ac27a0ec DK |
453 | } |
454 | ||
455 | for (i = 0; i < sbi->s_gdb_count; i++) | |
456 | brelse(sbi->s_group_desc[i]); | |
457 | kfree(sbi->s_group_desc); | |
458 | percpu_counter_destroy(&sbi->s_freeblocks_counter); | |
459 | percpu_counter_destroy(&sbi->s_freeinodes_counter); | |
460 | percpu_counter_destroy(&sbi->s_dirs_counter); | |
461 | brelse(sbi->s_sbh); | |
462 | #ifdef CONFIG_QUOTA | |
463 | for (i = 0; i < MAXQUOTAS; i++) | |
464 | kfree(sbi->s_qf_names[i]); | |
465 | #endif | |
466 | ||
467 | /* Debugging code just in case the in-memory inode orphan list | |
468 | * isn't empty. The on-disk one can be non-empty if we've | |
469 | * detected an error and taken the fs readonly, but the | |
470 | * in-memory list had better be clean by this point. */ | |
471 | if (!list_empty(&sbi->s_orphan)) | |
472 | dump_orphan_list(sb, sbi); | |
473 | J_ASSERT(list_empty(&sbi->s_orphan)); | |
474 | ||
f98393a6 | 475 | invalidate_bdev(sb->s_bdev); |
ac27a0ec DK |
476 | if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) { |
477 | /* | |
478 | * Invalidate the journal device's buffers. We don't want them | |
479 | * floating about in memory - the physical journal device may | |
480 | * hotswapped, and it breaks the `ro-after' testing code. | |
481 | */ | |
482 | sync_blockdev(sbi->journal_bdev); | |
f98393a6 | 483 | invalidate_bdev(sbi->journal_bdev); |
617ba13b | 484 | ext4_blkdev_remove(sbi); |
ac27a0ec DK |
485 | } |
486 | sb->s_fs_info = NULL; | |
487 | kfree(sbi); | |
488 | return; | |
489 | } | |
490 | ||
e18b890b | 491 | static struct kmem_cache *ext4_inode_cachep; |
ac27a0ec DK |
492 | |
493 | /* | |
494 | * Called inside transaction, so use GFP_NOFS | |
495 | */ | |
617ba13b | 496 | static struct inode *ext4_alloc_inode(struct super_block *sb) |
ac27a0ec | 497 | { |
617ba13b | 498 | struct ext4_inode_info *ei; |
ac27a0ec | 499 | |
e6b4f8da | 500 | ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS); |
ac27a0ec DK |
501 | if (!ei) |
502 | return NULL; | |
617ba13b MC |
503 | #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL |
504 | ei->i_acl = EXT4_ACL_NOT_CACHED; | |
505 | ei->i_default_acl = EXT4_ACL_NOT_CACHED; | |
ac27a0ec DK |
506 | #endif |
507 | ei->i_block_alloc_info = NULL; | |
508 | ei->vfs_inode.i_version = 1; | |
a86c6181 | 509 | memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache)); |
ac27a0ec DK |
510 | return &ei->vfs_inode; |
511 | } | |
512 | ||
617ba13b | 513 | static void ext4_destroy_inode(struct inode *inode) |
ac27a0ec | 514 | { |
9f7dd93d VA |
515 | if (!list_empty(&(EXT4_I(inode)->i_orphan))) { |
516 | printk("EXT4 Inode %p: orphan list check failed!\n", | |
517 | EXT4_I(inode)); | |
518 | print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4, | |
519 | EXT4_I(inode), sizeof(struct ext4_inode_info), | |
520 | true); | |
521 | dump_stack(); | |
522 | } | |
617ba13b | 523 | kmem_cache_free(ext4_inode_cachep, EXT4_I(inode)); |
ac27a0ec DK |
524 | } |
525 | ||
4ba9b9d0 | 526 | static void init_once(struct kmem_cache *cachep, void *foo) |
ac27a0ec | 527 | { |
617ba13b | 528 | struct ext4_inode_info *ei = (struct ext4_inode_info *) foo; |
ac27a0ec | 529 | |
a35afb83 | 530 | INIT_LIST_HEAD(&ei->i_orphan); |
617ba13b | 531 | #ifdef CONFIG_EXT4DEV_FS_XATTR |
a35afb83 | 532 | init_rwsem(&ei->xattr_sem); |
ac27a0ec | 533 | #endif |
a35afb83 CL |
534 | mutex_init(&ei->truncate_mutex); |
535 | inode_init_once(&ei->vfs_inode); | |
ac27a0ec DK |
536 | } |
537 | ||
538 | static int init_inodecache(void) | |
539 | { | |
617ba13b MC |
540 | ext4_inode_cachep = kmem_cache_create("ext4_inode_cache", |
541 | sizeof(struct ext4_inode_info), | |
ac27a0ec DK |
542 | 0, (SLAB_RECLAIM_ACCOUNT| |
543 | SLAB_MEM_SPREAD), | |
20c2df83 | 544 | init_once); |
617ba13b | 545 | if (ext4_inode_cachep == NULL) |
ac27a0ec DK |
546 | return -ENOMEM; |
547 | return 0; | |
548 | } | |
549 | ||
550 | static void destroy_inodecache(void) | |
551 | { | |
617ba13b | 552 | kmem_cache_destroy(ext4_inode_cachep); |
ac27a0ec DK |
553 | } |
554 | ||
617ba13b | 555 | static void ext4_clear_inode(struct inode *inode) |
ac27a0ec | 556 | { |
617ba13b MC |
557 | struct ext4_block_alloc_info *rsv = EXT4_I(inode)->i_block_alloc_info; |
558 | #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL | |
559 | if (EXT4_I(inode)->i_acl && | |
560 | EXT4_I(inode)->i_acl != EXT4_ACL_NOT_CACHED) { | |
561 | posix_acl_release(EXT4_I(inode)->i_acl); | |
562 | EXT4_I(inode)->i_acl = EXT4_ACL_NOT_CACHED; | |
563 | } | |
564 | if (EXT4_I(inode)->i_default_acl && | |
565 | EXT4_I(inode)->i_default_acl != EXT4_ACL_NOT_CACHED) { | |
566 | posix_acl_release(EXT4_I(inode)->i_default_acl); | |
567 | EXT4_I(inode)->i_default_acl = EXT4_ACL_NOT_CACHED; | |
ac27a0ec DK |
568 | } |
569 | #endif | |
617ba13b MC |
570 | ext4_discard_reservation(inode); |
571 | EXT4_I(inode)->i_block_alloc_info = NULL; | |
ac27a0ec DK |
572 | if (unlikely(rsv)) |
573 | kfree(rsv); | |
574 | } | |
575 | ||
617ba13b | 576 | static inline void ext4_show_quota_options(struct seq_file *seq, struct super_block *sb) |
ac27a0ec DK |
577 | { |
578 | #if defined(CONFIG_QUOTA) | |
617ba13b | 579 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
ac27a0ec DK |
580 | |
581 | if (sbi->s_jquota_fmt) | |
582 | seq_printf(seq, ",jqfmt=%s", | |
583 | (sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold": "vfsv0"); | |
584 | ||
585 | if (sbi->s_qf_names[USRQUOTA]) | |
586 | seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]); | |
587 | ||
588 | if (sbi->s_qf_names[GRPQUOTA]) | |
589 | seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]); | |
590 | ||
617ba13b | 591 | if (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA) |
ac27a0ec DK |
592 | seq_puts(seq, ",usrquota"); |
593 | ||
617ba13b | 594 | if (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA) |
ac27a0ec DK |
595 | seq_puts(seq, ",grpquota"); |
596 | #endif | |
597 | } | |
598 | ||
d9c9bef1 MS |
599 | /* |
600 | * Show an option if | |
601 | * - it's set to a non-default value OR | |
602 | * - if the per-sb default is different from the global default | |
603 | */ | |
617ba13b | 604 | static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs) |
ac27a0ec DK |
605 | { |
606 | struct super_block *sb = vfs->mnt_sb; | |
d9c9bef1 MS |
607 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
608 | struct ext4_super_block *es = sbi->s_es; | |
609 | unsigned long def_mount_opts; | |
610 | ||
611 | def_mount_opts = le32_to_cpu(es->s_default_mount_opts); | |
612 | ||
613 | if (sbi->s_sb_block != 1) | |
614 | seq_printf(seq, ",sb=%llu", sbi->s_sb_block); | |
615 | if (test_opt(sb, MINIX_DF)) | |
616 | seq_puts(seq, ",minixdf"); | |
617 | if (test_opt(sb, GRPID)) | |
618 | seq_puts(seq, ",grpid"); | |
619 | if (!test_opt(sb, GRPID) && (def_mount_opts & EXT4_DEFM_BSDGROUPS)) | |
620 | seq_puts(seq, ",nogrpid"); | |
621 | if (sbi->s_resuid != EXT4_DEF_RESUID || | |
622 | le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID) { | |
623 | seq_printf(seq, ",resuid=%u", sbi->s_resuid); | |
624 | } | |
625 | if (sbi->s_resgid != EXT4_DEF_RESGID || | |
626 | le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID) { | |
627 | seq_printf(seq, ",resgid=%u", sbi->s_resgid); | |
628 | } | |
629 | if (test_opt(sb, ERRORS_CONT)) { | |
630 | int def_errors = le16_to_cpu(es->s_errors); | |
631 | ||
632 | if (def_errors == EXT4_ERRORS_PANIC || | |
633 | def_errors == EXT4_ERRORS_RO) { | |
634 | seq_puts(seq, ",errors=continue"); | |
635 | } | |
636 | } | |
637 | if (test_opt(sb, ERRORS_RO)) | |
638 | seq_puts(seq, ",errors=remount-ro"); | |
639 | if (test_opt(sb, ERRORS_PANIC)) | |
640 | seq_puts(seq, ",errors=panic"); | |
641 | if (test_opt(sb, NO_UID32)) | |
642 | seq_puts(seq, ",nouid32"); | |
643 | if (test_opt(sb, DEBUG)) | |
644 | seq_puts(seq, ",debug"); | |
645 | if (test_opt(sb, OLDALLOC)) | |
646 | seq_puts(seq, ",oldalloc"); | |
647 | #ifdef CONFIG_EXT4_FS_XATTR | |
648 | if (test_opt(sb, XATTR_USER)) | |
649 | seq_puts(seq, ",user_xattr"); | |
650 | if (!test_opt(sb, XATTR_USER) && | |
651 | (def_mount_opts & EXT4_DEFM_XATTR_USER)) { | |
652 | seq_puts(seq, ",nouser_xattr"); | |
653 | } | |
654 | #endif | |
655 | #ifdef CONFIG_EXT4_FS_POSIX_ACL | |
656 | if (test_opt(sb, POSIX_ACL)) | |
657 | seq_puts(seq, ",acl"); | |
658 | if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT4_DEFM_ACL)) | |
659 | seq_puts(seq, ",noacl"); | |
660 | #endif | |
661 | if (!test_opt(sb, RESERVATION)) | |
662 | seq_puts(seq, ",noreservation"); | |
663 | if (sbi->s_commit_interval) { | |
664 | seq_printf(seq, ",commit=%u", | |
665 | (unsigned) (sbi->s_commit_interval / HZ)); | |
666 | } | |
667 | if (test_opt(sb, BARRIER)) | |
668 | seq_puts(seq, ",barrier=1"); | |
669 | if (test_opt(sb, NOBH)) | |
670 | seq_puts(seq, ",nobh"); | |
671 | if (!test_opt(sb, EXTENTS)) | |
672 | seq_puts(seq, ",noextents"); | |
ac27a0ec | 673 | |
617ba13b | 674 | if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) |
ac27a0ec | 675 | seq_puts(seq, ",data=journal"); |
617ba13b | 676 | else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) |
ac27a0ec | 677 | seq_puts(seq, ",data=ordered"); |
617ba13b | 678 | else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA) |
ac27a0ec DK |
679 | seq_puts(seq, ",data=writeback"); |
680 | ||
617ba13b | 681 | ext4_show_quota_options(seq, sb); |
ac27a0ec DK |
682 | |
683 | return 0; | |
684 | } | |
685 | ||
686 | ||
617ba13b | 687 | static struct dentry *ext4_get_dentry(struct super_block *sb, void *vobjp) |
ac27a0ec DK |
688 | { |
689 | __u32 *objp = vobjp; | |
690 | unsigned long ino = objp[0]; | |
691 | __u32 generation = objp[1]; | |
692 | struct inode *inode; | |
693 | struct dentry *result; | |
694 | ||
617ba13b | 695 | if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO) |
ac27a0ec | 696 | return ERR_PTR(-ESTALE); |
617ba13b | 697 | if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)) |
ac27a0ec DK |
698 | return ERR_PTR(-ESTALE); |
699 | ||
700 | /* iget isn't really right if the inode is currently unallocated!! | |
701 | * | |
617ba13b | 702 | * ext4_read_inode will return a bad_inode if the inode had been |
ac27a0ec DK |
703 | * deleted, so we should be safe. |
704 | * | |
705 | * Currently we don't know the generation for parent directory, so | |
706 | * a generation of 0 means "accept any" | |
707 | */ | |
708 | inode = iget(sb, ino); | |
709 | if (inode == NULL) | |
710 | return ERR_PTR(-ENOMEM); | |
711 | if (is_bad_inode(inode) || | |
712 | (generation && inode->i_generation != generation)) { | |
713 | iput(inode); | |
714 | return ERR_PTR(-ESTALE); | |
715 | } | |
716 | /* now to find a dentry. | |
717 | * If possible, get a well-connected one | |
718 | */ | |
719 | result = d_alloc_anon(inode); | |
720 | if (!result) { | |
721 | iput(inode); | |
722 | return ERR_PTR(-ENOMEM); | |
723 | } | |
724 | return result; | |
725 | } | |
726 | ||
727 | #ifdef CONFIG_QUOTA | |
728 | #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group") | |
729 | #define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA)) | |
730 | ||
617ba13b MC |
731 | static int ext4_dquot_initialize(struct inode *inode, int type); |
732 | static int ext4_dquot_drop(struct inode *inode); | |
733 | static int ext4_write_dquot(struct dquot *dquot); | |
734 | static int ext4_acquire_dquot(struct dquot *dquot); | |
735 | static int ext4_release_dquot(struct dquot *dquot); | |
736 | static int ext4_mark_dquot_dirty(struct dquot *dquot); | |
737 | static int ext4_write_info(struct super_block *sb, int type); | |
738 | static int ext4_quota_on(struct super_block *sb, int type, int format_id, char *path); | |
739 | static int ext4_quota_on_mount(struct super_block *sb, int type); | |
740 | static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data, | |
ac27a0ec | 741 | size_t len, loff_t off); |
617ba13b | 742 | static ssize_t ext4_quota_write(struct super_block *sb, int type, |
ac27a0ec DK |
743 | const char *data, size_t len, loff_t off); |
744 | ||
617ba13b MC |
745 | static struct dquot_operations ext4_quota_operations = { |
746 | .initialize = ext4_dquot_initialize, | |
747 | .drop = ext4_dquot_drop, | |
ac27a0ec DK |
748 | .alloc_space = dquot_alloc_space, |
749 | .alloc_inode = dquot_alloc_inode, | |
750 | .free_space = dquot_free_space, | |
751 | .free_inode = dquot_free_inode, | |
752 | .transfer = dquot_transfer, | |
617ba13b MC |
753 | .write_dquot = ext4_write_dquot, |
754 | .acquire_dquot = ext4_acquire_dquot, | |
755 | .release_dquot = ext4_release_dquot, | |
756 | .mark_dirty = ext4_mark_dquot_dirty, | |
757 | .write_info = ext4_write_info | |
ac27a0ec DK |
758 | }; |
759 | ||
617ba13b MC |
760 | static struct quotactl_ops ext4_qctl_operations = { |
761 | .quota_on = ext4_quota_on, | |
ac27a0ec DK |
762 | .quota_off = vfs_quota_off, |
763 | .quota_sync = vfs_quota_sync, | |
764 | .get_info = vfs_get_dqinfo, | |
765 | .set_info = vfs_set_dqinfo, | |
766 | .get_dqblk = vfs_get_dqblk, | |
767 | .set_dqblk = vfs_set_dqblk | |
768 | }; | |
769 | #endif | |
770 | ||
ee9b6d61 | 771 | static const struct super_operations ext4_sops = { |
617ba13b MC |
772 | .alloc_inode = ext4_alloc_inode, |
773 | .destroy_inode = ext4_destroy_inode, | |
774 | .read_inode = ext4_read_inode, | |
775 | .write_inode = ext4_write_inode, | |
776 | .dirty_inode = ext4_dirty_inode, | |
777 | .delete_inode = ext4_delete_inode, | |
778 | .put_super = ext4_put_super, | |
779 | .write_super = ext4_write_super, | |
780 | .sync_fs = ext4_sync_fs, | |
781 | .write_super_lockfs = ext4_write_super_lockfs, | |
782 | .unlockfs = ext4_unlockfs, | |
783 | .statfs = ext4_statfs, | |
784 | .remount_fs = ext4_remount, | |
785 | .clear_inode = ext4_clear_inode, | |
786 | .show_options = ext4_show_options, | |
ac27a0ec | 787 | #ifdef CONFIG_QUOTA |
617ba13b MC |
788 | .quota_read = ext4_quota_read, |
789 | .quota_write = ext4_quota_write, | |
ac27a0ec DK |
790 | #endif |
791 | }; | |
792 | ||
617ba13b MC |
793 | static struct export_operations ext4_export_ops = { |
794 | .get_parent = ext4_get_parent, | |
795 | .get_dentry = ext4_get_dentry, | |
ac27a0ec DK |
796 | }; |
797 | ||
798 | enum { | |
799 | Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid, | |
800 | Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro, | |
801 | Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov, | |
802 | Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl, | |
803 | Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh, | |
804 | Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev, | |
805 | Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback, | |
806 | Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota, | |
807 | Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota, | |
808 | Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota, | |
1e2462f9 | 809 | Opt_grpquota, Opt_extents, Opt_noextents, |
ac27a0ec DK |
810 | }; |
811 | ||
812 | static match_table_t tokens = { | |
813 | {Opt_bsd_df, "bsddf"}, | |
814 | {Opt_minix_df, "minixdf"}, | |
815 | {Opt_grpid, "grpid"}, | |
816 | {Opt_grpid, "bsdgroups"}, | |
817 | {Opt_nogrpid, "nogrpid"}, | |
818 | {Opt_nogrpid, "sysvgroups"}, | |
819 | {Opt_resgid, "resgid=%u"}, | |
820 | {Opt_resuid, "resuid=%u"}, | |
821 | {Opt_sb, "sb=%u"}, | |
822 | {Opt_err_cont, "errors=continue"}, | |
823 | {Opt_err_panic, "errors=panic"}, | |
824 | {Opt_err_ro, "errors=remount-ro"}, | |
825 | {Opt_nouid32, "nouid32"}, | |
826 | {Opt_nocheck, "nocheck"}, | |
827 | {Opt_nocheck, "check=none"}, | |
828 | {Opt_debug, "debug"}, | |
829 | {Opt_oldalloc, "oldalloc"}, | |
830 | {Opt_orlov, "orlov"}, | |
831 | {Opt_user_xattr, "user_xattr"}, | |
832 | {Opt_nouser_xattr, "nouser_xattr"}, | |
833 | {Opt_acl, "acl"}, | |
834 | {Opt_noacl, "noacl"}, | |
835 | {Opt_reservation, "reservation"}, | |
836 | {Opt_noreservation, "noreservation"}, | |
837 | {Opt_noload, "noload"}, | |
838 | {Opt_nobh, "nobh"}, | |
839 | {Opt_bh, "bh"}, | |
840 | {Opt_commit, "commit=%u"}, | |
841 | {Opt_journal_update, "journal=update"}, | |
842 | {Opt_journal_inum, "journal=%u"}, | |
843 | {Opt_journal_dev, "journal_dev=%u"}, | |
844 | {Opt_abort, "abort"}, | |
845 | {Opt_data_journal, "data=journal"}, | |
846 | {Opt_data_ordered, "data=ordered"}, | |
847 | {Opt_data_writeback, "data=writeback"}, | |
848 | {Opt_offusrjquota, "usrjquota="}, | |
849 | {Opt_usrjquota, "usrjquota=%s"}, | |
850 | {Opt_offgrpjquota, "grpjquota="}, | |
851 | {Opt_grpjquota, "grpjquota=%s"}, | |
852 | {Opt_jqfmt_vfsold, "jqfmt=vfsold"}, | |
853 | {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"}, | |
854 | {Opt_grpquota, "grpquota"}, | |
855 | {Opt_noquota, "noquota"}, | |
856 | {Opt_quota, "quota"}, | |
857 | {Opt_usrquota, "usrquota"}, | |
858 | {Opt_barrier, "barrier=%u"}, | |
a86c6181 | 859 | {Opt_extents, "extents"}, |
1e2462f9 | 860 | {Opt_noextents, "noextents"}, |
ac27a0ec DK |
861 | {Opt_err, NULL}, |
862 | {Opt_resize, "resize"}, | |
863 | }; | |
864 | ||
617ba13b | 865 | static ext4_fsblk_t get_sb_block(void **data) |
ac27a0ec | 866 | { |
617ba13b | 867 | ext4_fsblk_t sb_block; |
ac27a0ec DK |
868 | char *options = (char *) *data; |
869 | ||
870 | if (!options || strncmp(options, "sb=", 3) != 0) | |
871 | return 1; /* Default location */ | |
872 | options += 3; | |
617ba13b | 873 | /*todo: use simple_strtoll with >32bit ext4 */ |
ac27a0ec DK |
874 | sb_block = simple_strtoul(options, &options, 0); |
875 | if (*options && *options != ',') { | |
617ba13b | 876 | printk("EXT4-fs: Invalid sb specification: %s\n", |
ac27a0ec DK |
877 | (char *) *data); |
878 | return 1; | |
879 | } | |
880 | if (*options == ',') | |
881 | options++; | |
882 | *data = (void *) options; | |
883 | return sb_block; | |
884 | } | |
885 | ||
886 | static int parse_options (char *options, struct super_block *sb, | |
887 | unsigned int *inum, unsigned long *journal_devnum, | |
617ba13b | 888 | ext4_fsblk_t *n_blocks_count, int is_remount) |
ac27a0ec | 889 | { |
617ba13b | 890 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
ac27a0ec DK |
891 | char * p; |
892 | substring_t args[MAX_OPT_ARGS]; | |
893 | int data_opt = 0; | |
894 | int option; | |
895 | #ifdef CONFIG_QUOTA | |
896 | int qtype; | |
897 | char *qname; | |
898 | #endif | |
899 | ||
900 | if (!options) | |
901 | return 1; | |
902 | ||
903 | while ((p = strsep (&options, ",")) != NULL) { | |
904 | int token; | |
905 | if (!*p) | |
906 | continue; | |
907 | ||
908 | token = match_token(p, tokens, args); | |
909 | switch (token) { | |
910 | case Opt_bsd_df: | |
911 | clear_opt (sbi->s_mount_opt, MINIX_DF); | |
912 | break; | |
913 | case Opt_minix_df: | |
914 | set_opt (sbi->s_mount_opt, MINIX_DF); | |
915 | break; | |
916 | case Opt_grpid: | |
917 | set_opt (sbi->s_mount_opt, GRPID); | |
918 | break; | |
919 | case Opt_nogrpid: | |
920 | clear_opt (sbi->s_mount_opt, GRPID); | |
921 | break; | |
922 | case Opt_resuid: | |
923 | if (match_int(&args[0], &option)) | |
924 | return 0; | |
925 | sbi->s_resuid = option; | |
926 | break; | |
927 | case Opt_resgid: | |
928 | if (match_int(&args[0], &option)) | |
929 | return 0; | |
930 | sbi->s_resgid = option; | |
931 | break; | |
932 | case Opt_sb: | |
933 | /* handled by get_sb_block() instead of here */ | |
934 | /* *sb_block = match_int(&args[0]); */ | |
935 | break; | |
936 | case Opt_err_panic: | |
937 | clear_opt (sbi->s_mount_opt, ERRORS_CONT); | |
938 | clear_opt (sbi->s_mount_opt, ERRORS_RO); | |
939 | set_opt (sbi->s_mount_opt, ERRORS_PANIC); | |
940 | break; | |
941 | case Opt_err_ro: | |
942 | clear_opt (sbi->s_mount_opt, ERRORS_CONT); | |
943 | clear_opt (sbi->s_mount_opt, ERRORS_PANIC); | |
944 | set_opt (sbi->s_mount_opt, ERRORS_RO); | |
945 | break; | |
946 | case Opt_err_cont: | |
947 | clear_opt (sbi->s_mount_opt, ERRORS_RO); | |
948 | clear_opt (sbi->s_mount_opt, ERRORS_PANIC); | |
949 | set_opt (sbi->s_mount_opt, ERRORS_CONT); | |
950 | break; | |
951 | case Opt_nouid32: | |
952 | set_opt (sbi->s_mount_opt, NO_UID32); | |
953 | break; | |
954 | case Opt_nocheck: | |
955 | clear_opt (sbi->s_mount_opt, CHECK); | |
956 | break; | |
957 | case Opt_debug: | |
958 | set_opt (sbi->s_mount_opt, DEBUG); | |
959 | break; | |
960 | case Opt_oldalloc: | |
961 | set_opt (sbi->s_mount_opt, OLDALLOC); | |
962 | break; | |
963 | case Opt_orlov: | |
964 | clear_opt (sbi->s_mount_opt, OLDALLOC); | |
965 | break; | |
617ba13b | 966 | #ifdef CONFIG_EXT4DEV_FS_XATTR |
ac27a0ec DK |
967 | case Opt_user_xattr: |
968 | set_opt (sbi->s_mount_opt, XATTR_USER); | |
969 | break; | |
970 | case Opt_nouser_xattr: | |
971 | clear_opt (sbi->s_mount_opt, XATTR_USER); | |
972 | break; | |
973 | #else | |
974 | case Opt_user_xattr: | |
975 | case Opt_nouser_xattr: | |
617ba13b | 976 | printk("EXT4 (no)user_xattr options not supported\n"); |
ac27a0ec DK |
977 | break; |
978 | #endif | |
617ba13b | 979 | #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL |
ac27a0ec DK |
980 | case Opt_acl: |
981 | set_opt(sbi->s_mount_opt, POSIX_ACL); | |
982 | break; | |
983 | case Opt_noacl: | |
984 | clear_opt(sbi->s_mount_opt, POSIX_ACL); | |
985 | break; | |
986 | #else | |
987 | case Opt_acl: | |
988 | case Opt_noacl: | |
617ba13b | 989 | printk("EXT4 (no)acl options not supported\n"); |
ac27a0ec DK |
990 | break; |
991 | #endif | |
992 | case Opt_reservation: | |
993 | set_opt(sbi->s_mount_opt, RESERVATION); | |
994 | break; | |
995 | case Opt_noreservation: | |
996 | clear_opt(sbi->s_mount_opt, RESERVATION); | |
997 | break; | |
998 | case Opt_journal_update: | |
999 | /* @@@ FIXME */ | |
1000 | /* Eventually we will want to be able to create | |
1001 | a journal file here. For now, only allow the | |
1002 | user to specify an existing inode to be the | |
1003 | journal file. */ | |
1004 | if (is_remount) { | |
617ba13b | 1005 | printk(KERN_ERR "EXT4-fs: cannot specify " |
ac27a0ec DK |
1006 | "journal on remount\n"); |
1007 | return 0; | |
1008 | } | |
1009 | set_opt (sbi->s_mount_opt, UPDATE_JOURNAL); | |
1010 | break; | |
1011 | case Opt_journal_inum: | |
1012 | if (is_remount) { | |
617ba13b | 1013 | printk(KERN_ERR "EXT4-fs: cannot specify " |
ac27a0ec DK |
1014 | "journal on remount\n"); |
1015 | return 0; | |
1016 | } | |
1017 | if (match_int(&args[0], &option)) | |
1018 | return 0; | |
1019 | *inum = option; | |
1020 | break; | |
1021 | case Opt_journal_dev: | |
1022 | if (is_remount) { | |
617ba13b | 1023 | printk(KERN_ERR "EXT4-fs: cannot specify " |
ac27a0ec DK |
1024 | "journal on remount\n"); |
1025 | return 0; | |
1026 | } | |
1027 | if (match_int(&args[0], &option)) | |
1028 | return 0; | |
1029 | *journal_devnum = option; | |
1030 | break; | |
1031 | case Opt_noload: | |
1032 | set_opt (sbi->s_mount_opt, NOLOAD); | |
1033 | break; | |
1034 | case Opt_commit: | |
1035 | if (match_int(&args[0], &option)) | |
1036 | return 0; | |
1037 | if (option < 0) | |
1038 | return 0; | |
1039 | if (option == 0) | |
1040 | option = JBD_DEFAULT_MAX_COMMIT_AGE; | |
1041 | sbi->s_commit_interval = HZ * option; | |
1042 | break; | |
1043 | case Opt_data_journal: | |
617ba13b | 1044 | data_opt = EXT4_MOUNT_JOURNAL_DATA; |
ac27a0ec DK |
1045 | goto datacheck; |
1046 | case Opt_data_ordered: | |
617ba13b | 1047 | data_opt = EXT4_MOUNT_ORDERED_DATA; |
ac27a0ec DK |
1048 | goto datacheck; |
1049 | case Opt_data_writeback: | |
617ba13b | 1050 | data_opt = EXT4_MOUNT_WRITEBACK_DATA; |
ac27a0ec DK |
1051 | datacheck: |
1052 | if (is_remount) { | |
617ba13b | 1053 | if ((sbi->s_mount_opt & EXT4_MOUNT_DATA_FLAGS) |
ac27a0ec DK |
1054 | != data_opt) { |
1055 | printk(KERN_ERR | |
617ba13b | 1056 | "EXT4-fs: cannot change data " |
ac27a0ec DK |
1057 | "mode on remount\n"); |
1058 | return 0; | |
1059 | } | |
1060 | } else { | |
617ba13b | 1061 | sbi->s_mount_opt &= ~EXT4_MOUNT_DATA_FLAGS; |
ac27a0ec DK |
1062 | sbi->s_mount_opt |= data_opt; |
1063 | } | |
1064 | break; | |
1065 | #ifdef CONFIG_QUOTA | |
1066 | case Opt_usrjquota: | |
1067 | qtype = USRQUOTA; | |
1068 | goto set_qf_name; | |
1069 | case Opt_grpjquota: | |
1070 | qtype = GRPQUOTA; | |
1071 | set_qf_name: | |
1072 | if (sb_any_quota_enabled(sb)) { | |
1073 | printk(KERN_ERR | |
617ba13b | 1074 | "EXT4-fs: Cannot change journalled " |
ac27a0ec DK |
1075 | "quota options when quota turned on.\n"); |
1076 | return 0; | |
1077 | } | |
1078 | qname = match_strdup(&args[0]); | |
1079 | if (!qname) { | |
1080 | printk(KERN_ERR | |
617ba13b | 1081 | "EXT4-fs: not enough memory for " |
ac27a0ec DK |
1082 | "storing quotafile name.\n"); |
1083 | return 0; | |
1084 | } | |
1085 | if (sbi->s_qf_names[qtype] && | |
1086 | strcmp(sbi->s_qf_names[qtype], qname)) { | |
1087 | printk(KERN_ERR | |
617ba13b | 1088 | "EXT4-fs: %s quota file already " |
ac27a0ec DK |
1089 | "specified.\n", QTYPE2NAME(qtype)); |
1090 | kfree(qname); | |
1091 | return 0; | |
1092 | } | |
1093 | sbi->s_qf_names[qtype] = qname; | |
1094 | if (strchr(sbi->s_qf_names[qtype], '/')) { | |
1095 | printk(KERN_ERR | |
617ba13b | 1096 | "EXT4-fs: quotafile must be on " |
ac27a0ec DK |
1097 | "filesystem root.\n"); |
1098 | kfree(sbi->s_qf_names[qtype]); | |
1099 | sbi->s_qf_names[qtype] = NULL; | |
1100 | return 0; | |
1101 | } | |
1102 | set_opt(sbi->s_mount_opt, QUOTA); | |
1103 | break; | |
1104 | case Opt_offusrjquota: | |
1105 | qtype = USRQUOTA; | |
1106 | goto clear_qf_name; | |
1107 | case Opt_offgrpjquota: | |
1108 | qtype = GRPQUOTA; | |
1109 | clear_qf_name: | |
1110 | if (sb_any_quota_enabled(sb)) { | |
617ba13b | 1111 | printk(KERN_ERR "EXT4-fs: Cannot change " |
ac27a0ec DK |
1112 | "journalled quota options when " |
1113 | "quota turned on.\n"); | |
1114 | return 0; | |
1115 | } | |
1116 | /* | |
1117 | * The space will be released later when all options | |
1118 | * are confirmed to be correct | |
1119 | */ | |
1120 | sbi->s_qf_names[qtype] = NULL; | |
1121 | break; | |
1122 | case Opt_jqfmt_vfsold: | |
1123 | sbi->s_jquota_fmt = QFMT_VFS_OLD; | |
1124 | break; | |
1125 | case Opt_jqfmt_vfsv0: | |
1126 | sbi->s_jquota_fmt = QFMT_VFS_V0; | |
1127 | break; | |
1128 | case Opt_quota: | |
1129 | case Opt_usrquota: | |
1130 | set_opt(sbi->s_mount_opt, QUOTA); | |
1131 | set_opt(sbi->s_mount_opt, USRQUOTA); | |
1132 | break; | |
1133 | case Opt_grpquota: | |
1134 | set_opt(sbi->s_mount_opt, QUOTA); | |
1135 | set_opt(sbi->s_mount_opt, GRPQUOTA); | |
1136 | break; | |
1137 | case Opt_noquota: | |
1138 | if (sb_any_quota_enabled(sb)) { | |
617ba13b | 1139 | printk(KERN_ERR "EXT4-fs: Cannot change quota " |
ac27a0ec DK |
1140 | "options when quota turned on.\n"); |
1141 | return 0; | |
1142 | } | |
1143 | clear_opt(sbi->s_mount_opt, QUOTA); | |
1144 | clear_opt(sbi->s_mount_opt, USRQUOTA); | |
1145 | clear_opt(sbi->s_mount_opt, GRPQUOTA); | |
1146 | break; | |
1147 | #else | |
1148 | case Opt_quota: | |
1149 | case Opt_usrquota: | |
1150 | case Opt_grpquota: | |
1151 | case Opt_usrjquota: | |
1152 | case Opt_grpjquota: | |
1153 | case Opt_offusrjquota: | |
1154 | case Opt_offgrpjquota: | |
1155 | case Opt_jqfmt_vfsold: | |
1156 | case Opt_jqfmt_vfsv0: | |
1157 | printk(KERN_ERR | |
617ba13b | 1158 | "EXT4-fs: journalled quota options not " |
ac27a0ec DK |
1159 | "supported.\n"); |
1160 | break; | |
1161 | case Opt_noquota: | |
1162 | break; | |
1163 | #endif | |
1164 | case Opt_abort: | |
1165 | set_opt(sbi->s_mount_opt, ABORT); | |
1166 | break; | |
1167 | case Opt_barrier: | |
1168 | if (match_int(&args[0], &option)) | |
1169 | return 0; | |
1170 | if (option) | |
1171 | set_opt(sbi->s_mount_opt, BARRIER); | |
1172 | else | |
1173 | clear_opt(sbi->s_mount_opt, BARRIER); | |
1174 | break; | |
1175 | case Opt_ignore: | |
1176 | break; | |
1177 | case Opt_resize: | |
1178 | if (!is_remount) { | |
617ba13b | 1179 | printk("EXT4-fs: resize option only available " |
ac27a0ec DK |
1180 | "for remount\n"); |
1181 | return 0; | |
1182 | } | |
1183 | if (match_int(&args[0], &option) != 0) | |
1184 | return 0; | |
1185 | *n_blocks_count = option; | |
1186 | break; | |
1187 | case Opt_nobh: | |
1188 | set_opt(sbi->s_mount_opt, NOBH); | |
1189 | break; | |
1190 | case Opt_bh: | |
1191 | clear_opt(sbi->s_mount_opt, NOBH); | |
1192 | break; | |
a86c6181 AT |
1193 | case Opt_extents: |
1194 | set_opt (sbi->s_mount_opt, EXTENTS); | |
1195 | break; | |
1e2462f9 MC |
1196 | case Opt_noextents: |
1197 | clear_opt (sbi->s_mount_opt, EXTENTS); | |
1198 | break; | |
ac27a0ec DK |
1199 | default: |
1200 | printk (KERN_ERR | |
617ba13b | 1201 | "EXT4-fs: Unrecognized mount option \"%s\" " |
ac27a0ec DK |
1202 | "or missing value\n", p); |
1203 | return 0; | |
1204 | } | |
1205 | } | |
1206 | #ifdef CONFIG_QUOTA | |
1207 | if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) { | |
617ba13b | 1208 | if ((sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA) && |
ac27a0ec DK |
1209 | sbi->s_qf_names[USRQUOTA]) |
1210 | clear_opt(sbi->s_mount_opt, USRQUOTA); | |
1211 | ||
617ba13b | 1212 | if ((sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA) && |
ac27a0ec DK |
1213 | sbi->s_qf_names[GRPQUOTA]) |
1214 | clear_opt(sbi->s_mount_opt, GRPQUOTA); | |
1215 | ||
1216 | if ((sbi->s_qf_names[USRQUOTA] && | |
617ba13b | 1217 | (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)) || |
ac27a0ec | 1218 | (sbi->s_qf_names[GRPQUOTA] && |
617ba13b MC |
1219 | (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA))) { |
1220 | printk(KERN_ERR "EXT4-fs: old and new quota " | |
ac27a0ec DK |
1221 | "format mixing.\n"); |
1222 | return 0; | |
1223 | } | |
1224 | ||
1225 | if (!sbi->s_jquota_fmt) { | |
617ba13b | 1226 | printk(KERN_ERR "EXT4-fs: journalled quota format " |
ac27a0ec DK |
1227 | "not specified.\n"); |
1228 | return 0; | |
1229 | } | |
1230 | } else { | |
1231 | if (sbi->s_jquota_fmt) { | |
617ba13b | 1232 | printk(KERN_ERR "EXT4-fs: journalled quota format " |
ac27a0ec DK |
1233 | "specified with no journalling " |
1234 | "enabled.\n"); | |
1235 | return 0; | |
1236 | } | |
1237 | } | |
1238 | #endif | |
1239 | return 1; | |
1240 | } | |
1241 | ||
617ba13b | 1242 | static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es, |
ac27a0ec DK |
1243 | int read_only) |
1244 | { | |
617ba13b | 1245 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
ac27a0ec DK |
1246 | int res = 0; |
1247 | ||
617ba13b MC |
1248 | if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) { |
1249 | printk (KERN_ERR "EXT4-fs warning: revision level too high, " | |
ac27a0ec DK |
1250 | "forcing read-only mode\n"); |
1251 | res = MS_RDONLY; | |
1252 | } | |
1253 | if (read_only) | |
1254 | return res; | |
617ba13b MC |
1255 | if (!(sbi->s_mount_state & EXT4_VALID_FS)) |
1256 | printk (KERN_WARNING "EXT4-fs warning: mounting unchecked fs, " | |
ac27a0ec | 1257 | "running e2fsck is recommended\n"); |
617ba13b | 1258 | else if ((sbi->s_mount_state & EXT4_ERROR_FS)) |
ac27a0ec | 1259 | printk (KERN_WARNING |
617ba13b | 1260 | "EXT4-fs warning: mounting fs with errors, " |
ac27a0ec DK |
1261 | "running e2fsck is recommended\n"); |
1262 | else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 && | |
1263 | le16_to_cpu(es->s_mnt_count) >= | |
1264 | (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count)) | |
1265 | printk (KERN_WARNING | |
617ba13b | 1266 | "EXT4-fs warning: maximal mount count reached, " |
ac27a0ec DK |
1267 | "running e2fsck is recommended\n"); |
1268 | else if (le32_to_cpu(es->s_checkinterval) && | |
1269 | (le32_to_cpu(es->s_lastcheck) + | |
1270 | le32_to_cpu(es->s_checkinterval) <= get_seconds())) | |
1271 | printk (KERN_WARNING | |
617ba13b | 1272 | "EXT4-fs warning: checktime reached, " |
ac27a0ec DK |
1273 | "running e2fsck is recommended\n"); |
1274 | #if 0 | |
1275 | /* @@@ We _will_ want to clear the valid bit if we find | |
63f57933 AM |
1276 | * inconsistencies, to force a fsck at reboot. But for |
1277 | * a plain journaled filesystem we can keep it set as | |
1278 | * valid forever! :) | |
1279 | */ | |
617ba13b | 1280 | es->s_state = cpu_to_le16(le16_to_cpu(es->s_state) & ~EXT4_VALID_FS); |
ac27a0ec DK |
1281 | #endif |
1282 | if (!(__s16) le16_to_cpu(es->s_max_mnt_count)) | |
617ba13b | 1283 | es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT); |
ac27a0ec DK |
1284 | es->s_mnt_count=cpu_to_le16(le16_to_cpu(es->s_mnt_count) + 1); |
1285 | es->s_mtime = cpu_to_le32(get_seconds()); | |
617ba13b MC |
1286 | ext4_update_dynamic_rev(sb); |
1287 | EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); | |
ac27a0ec | 1288 | |
617ba13b | 1289 | ext4_commit_super(sb, es, 1); |
ac27a0ec | 1290 | if (test_opt(sb, DEBUG)) |
617ba13b | 1291 | printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%lu, " |
ac27a0ec DK |
1292 | "bpg=%lu, ipg=%lu, mo=%04lx]\n", |
1293 | sb->s_blocksize, | |
1294 | sbi->s_groups_count, | |
617ba13b MC |
1295 | EXT4_BLOCKS_PER_GROUP(sb), |
1296 | EXT4_INODES_PER_GROUP(sb), | |
ac27a0ec DK |
1297 | sbi->s_mount_opt); |
1298 | ||
617ba13b MC |
1299 | printk(KERN_INFO "EXT4 FS on %s, ", sb->s_id); |
1300 | if (EXT4_SB(sb)->s_journal->j_inode == NULL) { | |
ac27a0ec DK |
1301 | char b[BDEVNAME_SIZE]; |
1302 | ||
1303 | printk("external journal on %s\n", | |
617ba13b | 1304 | bdevname(EXT4_SB(sb)->s_journal->j_dev, b)); |
ac27a0ec DK |
1305 | } else { |
1306 | printk("internal journal\n"); | |
1307 | } | |
1308 | return res; | |
1309 | } | |
1310 | ||
1311 | /* Called at mount-time, super-block is locked */ | |
617ba13b | 1312 | static int ext4_check_descriptors (struct super_block * sb) |
ac27a0ec | 1313 | { |
617ba13b MC |
1314 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
1315 | ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block); | |
1316 | ext4_fsblk_t last_block; | |
bd81d8ee LV |
1317 | ext4_fsblk_t block_bitmap; |
1318 | ext4_fsblk_t inode_bitmap; | |
1319 | ext4_fsblk_t inode_table; | |
617ba13b | 1320 | struct ext4_group_desc * gdp = NULL; |
ac27a0ec DK |
1321 | int desc_block = 0; |
1322 | int i; | |
1323 | ||
617ba13b | 1324 | ext4_debug ("Checking group descriptors"); |
ac27a0ec DK |
1325 | |
1326 | for (i = 0; i < sbi->s_groups_count; i++) | |
1327 | { | |
1328 | if (i == sbi->s_groups_count - 1) | |
bd81d8ee | 1329 | last_block = ext4_blocks_count(sbi->s_es) - 1; |
ac27a0ec DK |
1330 | else |
1331 | last_block = first_block + | |
617ba13b | 1332 | (EXT4_BLOCKS_PER_GROUP(sb) - 1); |
ac27a0ec | 1333 | |
617ba13b MC |
1334 | if ((i % EXT4_DESC_PER_BLOCK(sb)) == 0) |
1335 | gdp = (struct ext4_group_desc *) | |
ac27a0ec | 1336 | sbi->s_group_desc[desc_block++]->b_data; |
8fadc143 | 1337 | block_bitmap = ext4_block_bitmap(sb, gdp); |
bd81d8ee | 1338 | if (block_bitmap < first_block || block_bitmap > last_block) |
ac27a0ec | 1339 | { |
617ba13b | 1340 | ext4_error (sb, "ext4_check_descriptors", |
ac27a0ec | 1341 | "Block bitmap for group %d" |
2ae02107 | 1342 | " not in group (block %llu)!", |
bd81d8ee | 1343 | i, block_bitmap); |
ac27a0ec DK |
1344 | return 0; |
1345 | } | |
8fadc143 | 1346 | inode_bitmap = ext4_inode_bitmap(sb, gdp); |
bd81d8ee | 1347 | if (inode_bitmap < first_block || inode_bitmap > last_block) |
ac27a0ec | 1348 | { |
617ba13b | 1349 | ext4_error (sb, "ext4_check_descriptors", |
ac27a0ec | 1350 | "Inode bitmap for group %d" |
2ae02107 | 1351 | " not in group (block %llu)!", |
bd81d8ee | 1352 | i, inode_bitmap); |
ac27a0ec DK |
1353 | return 0; |
1354 | } | |
8fadc143 | 1355 | inode_table = ext4_inode_table(sb, gdp); |
bd81d8ee | 1356 | if (inode_table < first_block || |
780dcdb2 | 1357 | inode_table + sbi->s_itb_per_group - 1 > last_block) |
ac27a0ec | 1358 | { |
617ba13b | 1359 | ext4_error (sb, "ext4_check_descriptors", |
ac27a0ec | 1360 | "Inode table for group %d" |
2ae02107 | 1361 | " not in group (block %llu)!", |
bd81d8ee | 1362 | i, inode_table); |
ac27a0ec DK |
1363 | return 0; |
1364 | } | |
617ba13b | 1365 | first_block += EXT4_BLOCKS_PER_GROUP(sb); |
0d1ee42f AR |
1366 | gdp = (struct ext4_group_desc *) |
1367 | ((__u8 *)gdp + EXT4_DESC_SIZE(sb)); | |
ac27a0ec DK |
1368 | } |
1369 | ||
bd81d8ee | 1370 | ext4_free_blocks_count_set(sbi->s_es, ext4_count_free_blocks(sb)); |
617ba13b | 1371 | sbi->s_es->s_free_inodes_count=cpu_to_le32(ext4_count_free_inodes(sb)); |
ac27a0ec DK |
1372 | return 1; |
1373 | } | |
1374 | ||
1375 | ||
617ba13b | 1376 | /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at |
ac27a0ec DK |
1377 | * the superblock) which were deleted from all directories, but held open by |
1378 | * a process at the time of a crash. We walk the list and try to delete these | |
1379 | * inodes at recovery time (only with a read-write filesystem). | |
1380 | * | |
1381 | * In order to keep the orphan inode chain consistent during traversal (in | |
1382 | * case of crash during recovery), we link each inode into the superblock | |
1383 | * orphan list_head and handle it the same way as an inode deletion during | |
1384 | * normal operation (which journals the operations for us). | |
1385 | * | |
1386 | * We only do an iget() and an iput() on each inode, which is very safe if we | |
1387 | * accidentally point at an in-use or already deleted inode. The worst that | |
1388 | * can happen in this case is that we get a "bit already cleared" message from | |
617ba13b | 1389 | * ext4_free_inode(). The only reason we would point at a wrong inode is if |
ac27a0ec DK |
1390 | * e2fsck was run on this filesystem, and it must have already done the orphan |
1391 | * inode cleanup for us, so we can safely abort without any further action. | |
1392 | */ | |
617ba13b MC |
1393 | static void ext4_orphan_cleanup (struct super_block * sb, |
1394 | struct ext4_super_block * es) | |
ac27a0ec DK |
1395 | { |
1396 | unsigned int s_flags = sb->s_flags; | |
1397 | int nr_orphans = 0, nr_truncates = 0; | |
1398 | #ifdef CONFIG_QUOTA | |
1399 | int i; | |
1400 | #endif | |
1401 | if (!es->s_last_orphan) { | |
1402 | jbd_debug(4, "no orphan inodes to clean up\n"); | |
1403 | return; | |
1404 | } | |
1405 | ||
a8f48a95 ES |
1406 | if (bdev_read_only(sb->s_bdev)) { |
1407 | printk(KERN_ERR "EXT4-fs: write access " | |
1408 | "unavailable, skipping orphan cleanup.\n"); | |
1409 | return; | |
1410 | } | |
1411 | ||
617ba13b | 1412 | if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) { |
ac27a0ec DK |
1413 | if (es->s_last_orphan) |
1414 | jbd_debug(1, "Errors on filesystem, " | |
1415 | "clearing orphan list.\n"); | |
1416 | es->s_last_orphan = 0; | |
1417 | jbd_debug(1, "Skipping orphan recovery on fs with errors.\n"); | |
1418 | return; | |
1419 | } | |
1420 | ||
1421 | if (s_flags & MS_RDONLY) { | |
617ba13b | 1422 | printk(KERN_INFO "EXT4-fs: %s: orphan cleanup on readonly fs\n", |
ac27a0ec DK |
1423 | sb->s_id); |
1424 | sb->s_flags &= ~MS_RDONLY; | |
1425 | } | |
1426 | #ifdef CONFIG_QUOTA | |
1427 | /* Needed for iput() to work correctly and not trash data */ | |
1428 | sb->s_flags |= MS_ACTIVE; | |
1429 | /* Turn on quotas so that they are updated correctly */ | |
1430 | for (i = 0; i < MAXQUOTAS; i++) { | |
617ba13b MC |
1431 | if (EXT4_SB(sb)->s_qf_names[i]) { |
1432 | int ret = ext4_quota_on_mount(sb, i); | |
ac27a0ec DK |
1433 | if (ret < 0) |
1434 | printk(KERN_ERR | |
617ba13b | 1435 | "EXT4-fs: Cannot turn on journalled " |
ac27a0ec DK |
1436 | "quota: error %d\n", ret); |
1437 | } | |
1438 | } | |
1439 | #endif | |
1440 | ||
1441 | while (es->s_last_orphan) { | |
1442 | struct inode *inode; | |
1443 | ||
1444 | if (!(inode = | |
617ba13b | 1445 | ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan)))) { |
ac27a0ec DK |
1446 | es->s_last_orphan = 0; |
1447 | break; | |
1448 | } | |
1449 | ||
617ba13b | 1450 | list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan); |
ac27a0ec DK |
1451 | DQUOT_INIT(inode); |
1452 | if (inode->i_nlink) { | |
1453 | printk(KERN_DEBUG | |
1454 | "%s: truncating inode %lu to %Ld bytes\n", | |
1455 | __FUNCTION__, inode->i_ino, inode->i_size); | |
1456 | jbd_debug(2, "truncating inode %lu to %Ld bytes\n", | |
1457 | inode->i_ino, inode->i_size); | |
617ba13b | 1458 | ext4_truncate(inode); |
ac27a0ec DK |
1459 | nr_truncates++; |
1460 | } else { | |
1461 | printk(KERN_DEBUG | |
1462 | "%s: deleting unreferenced inode %lu\n", | |
1463 | __FUNCTION__, inode->i_ino); | |
1464 | jbd_debug(2, "deleting unreferenced inode %lu\n", | |
1465 | inode->i_ino); | |
1466 | nr_orphans++; | |
1467 | } | |
1468 | iput(inode); /* The delete magic happens here! */ | |
1469 | } | |
1470 | ||
1471 | #define PLURAL(x) (x), ((x)==1) ? "" : "s" | |
1472 | ||
1473 | if (nr_orphans) | |
617ba13b | 1474 | printk(KERN_INFO "EXT4-fs: %s: %d orphan inode%s deleted\n", |
ac27a0ec DK |
1475 | sb->s_id, PLURAL(nr_orphans)); |
1476 | if (nr_truncates) | |
617ba13b | 1477 | printk(KERN_INFO "EXT4-fs: %s: %d truncate%s cleaned up\n", |
ac27a0ec DK |
1478 | sb->s_id, PLURAL(nr_truncates)); |
1479 | #ifdef CONFIG_QUOTA | |
1480 | /* Turn quotas off */ | |
1481 | for (i = 0; i < MAXQUOTAS; i++) { | |
1482 | if (sb_dqopt(sb)->files[i]) | |
1483 | vfs_quota_off(sb, i); | |
1484 | } | |
1485 | #endif | |
1486 | sb->s_flags = s_flags; /* Restore MS_RDONLY status */ | |
1487 | } | |
1488 | ||
ac27a0ec DK |
1489 | /* |
1490 | * Maximal file size. There is a direct, and {,double-,triple-}indirect | |
1491 | * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks. | |
1492 | * We need to be 1 filesystem block less than the 2^32 sector limit. | |
1493 | */ | |
617ba13b | 1494 | static loff_t ext4_max_size(int bits) |
ac27a0ec | 1495 | { |
617ba13b | 1496 | loff_t res = EXT4_NDIR_BLOCKS; |
ac27a0ec DK |
1497 | /* This constant is calculated to be the largest file size for a |
1498 | * dense, 4k-blocksize file such that the total number of | |
1499 | * sectors in the file, including data and all indirect blocks, | |
1500 | * does not exceed 2^32. */ | |
1501 | const loff_t upper_limit = 0x1ff7fffd000LL; | |
1502 | ||
1503 | res += 1LL << (bits-2); | |
1504 | res += 1LL << (2*(bits-2)); | |
1505 | res += 1LL << (3*(bits-2)); | |
1506 | res <<= bits; | |
1507 | if (res > upper_limit) | |
1508 | res = upper_limit; | |
1509 | return res; | |
1510 | } | |
1511 | ||
617ba13b | 1512 | static ext4_fsblk_t descriptor_loc(struct super_block *sb, |
70bbb3e0 | 1513 | ext4_fsblk_t logical_sb_block, int nr) |
ac27a0ec | 1514 | { |
617ba13b | 1515 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
ac27a0ec DK |
1516 | unsigned long bg, first_meta_bg; |
1517 | int has_super = 0; | |
1518 | ||
1519 | first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg); | |
1520 | ||
617ba13b | 1521 | if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) || |
ac27a0ec | 1522 | nr < first_meta_bg) |
70bbb3e0 | 1523 | return logical_sb_block + nr + 1; |
ac27a0ec | 1524 | bg = sbi->s_desc_per_block * nr; |
617ba13b | 1525 | if (ext4_bg_has_super(sb, bg)) |
ac27a0ec | 1526 | has_super = 1; |
617ba13b | 1527 | return (has_super + ext4_group_first_block_no(sb, bg)); |
ac27a0ec DK |
1528 | } |
1529 | ||
1530 | ||
617ba13b | 1531 | static int ext4_fill_super (struct super_block *sb, void *data, int silent) |
ac27a0ec DK |
1532 | { |
1533 | struct buffer_head * bh; | |
617ba13b MC |
1534 | struct ext4_super_block *es = NULL; |
1535 | struct ext4_sb_info *sbi; | |
1536 | ext4_fsblk_t block; | |
1537 | ext4_fsblk_t sb_block = get_sb_block(&data); | |
70bbb3e0 | 1538 | ext4_fsblk_t logical_sb_block; |
ac27a0ec DK |
1539 | unsigned long offset = 0; |
1540 | unsigned int journal_inum = 0; | |
1541 | unsigned long journal_devnum = 0; | |
1542 | unsigned long def_mount_opts; | |
1543 | struct inode *root; | |
1544 | int blocksize; | |
1545 | int hblock; | |
1546 | int db_count; | |
1547 | int i; | |
1548 | int needs_recovery; | |
1549 | __le32 features; | |
bd81d8ee | 1550 | __u64 blocks_count; |
833f4077 | 1551 | int err; |
ac27a0ec DK |
1552 | |
1553 | sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); | |
1554 | if (!sbi) | |
1555 | return -ENOMEM; | |
1556 | sb->s_fs_info = sbi; | |
1557 | sbi->s_mount_opt = 0; | |
617ba13b MC |
1558 | sbi->s_resuid = EXT4_DEF_RESUID; |
1559 | sbi->s_resgid = EXT4_DEF_RESGID; | |
d9c9bef1 | 1560 | sbi->s_sb_block = sb_block; |
ac27a0ec DK |
1561 | |
1562 | unlock_kernel(); | |
1563 | ||
617ba13b | 1564 | blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE); |
ac27a0ec | 1565 | if (!blocksize) { |
617ba13b | 1566 | printk(KERN_ERR "EXT4-fs: unable to set blocksize\n"); |
ac27a0ec DK |
1567 | goto out_fail; |
1568 | } | |
1569 | ||
1570 | /* | |
617ba13b | 1571 | * The ext4 superblock will not be buffer aligned for other than 1kB |
ac27a0ec DK |
1572 | * block sizes. We need to calculate the offset from buffer start. |
1573 | */ | |
617ba13b | 1574 | if (blocksize != EXT4_MIN_BLOCK_SIZE) { |
70bbb3e0 AM |
1575 | logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE; |
1576 | offset = do_div(logical_sb_block, blocksize); | |
ac27a0ec | 1577 | } else { |
70bbb3e0 | 1578 | logical_sb_block = sb_block; |
ac27a0ec DK |
1579 | } |
1580 | ||
70bbb3e0 | 1581 | if (!(bh = sb_bread(sb, logical_sb_block))) { |
617ba13b | 1582 | printk (KERN_ERR "EXT4-fs: unable to read superblock\n"); |
ac27a0ec DK |
1583 | goto out_fail; |
1584 | } | |
1585 | /* | |
1586 | * Note: s_es must be initialized as soon as possible because | |
617ba13b | 1587 | * some ext4 macro-instructions depend on its value |
ac27a0ec | 1588 | */ |
617ba13b | 1589 | es = (struct ext4_super_block *) (((char *)bh->b_data) + offset); |
ac27a0ec DK |
1590 | sbi->s_es = es; |
1591 | sb->s_magic = le16_to_cpu(es->s_magic); | |
617ba13b MC |
1592 | if (sb->s_magic != EXT4_SUPER_MAGIC) |
1593 | goto cantfind_ext4; | |
ac27a0ec DK |
1594 | |
1595 | /* Set defaults before we parse the mount options */ | |
1596 | def_mount_opts = le32_to_cpu(es->s_default_mount_opts); | |
617ba13b | 1597 | if (def_mount_opts & EXT4_DEFM_DEBUG) |
ac27a0ec | 1598 | set_opt(sbi->s_mount_opt, DEBUG); |
617ba13b | 1599 | if (def_mount_opts & EXT4_DEFM_BSDGROUPS) |
ac27a0ec | 1600 | set_opt(sbi->s_mount_opt, GRPID); |
617ba13b | 1601 | if (def_mount_opts & EXT4_DEFM_UID16) |
ac27a0ec | 1602 | set_opt(sbi->s_mount_opt, NO_UID32); |
2e7842b8 | 1603 | #ifdef CONFIG_EXT4DEV_FS_XATTR |
617ba13b | 1604 | if (def_mount_opts & EXT4_DEFM_XATTR_USER) |
ac27a0ec | 1605 | set_opt(sbi->s_mount_opt, XATTR_USER); |
2e7842b8 HD |
1606 | #endif |
1607 | #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL | |
617ba13b | 1608 | if (def_mount_opts & EXT4_DEFM_ACL) |
ac27a0ec | 1609 | set_opt(sbi->s_mount_opt, POSIX_ACL); |
2e7842b8 | 1610 | #endif |
617ba13b MC |
1611 | if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA) |
1612 | sbi->s_mount_opt |= EXT4_MOUNT_JOURNAL_DATA; | |
1613 | else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED) | |
1614 | sbi->s_mount_opt |= EXT4_MOUNT_ORDERED_DATA; | |
1615 | else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK) | |
1616 | sbi->s_mount_opt |= EXT4_MOUNT_WRITEBACK_DATA; | |
1617 | ||
1618 | if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC) | |
ac27a0ec | 1619 | set_opt(sbi->s_mount_opt, ERRORS_PANIC); |
617ba13b | 1620 | else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_RO) |
ac27a0ec | 1621 | set_opt(sbi->s_mount_opt, ERRORS_RO); |
ceea16bf DM |
1622 | else |
1623 | set_opt(sbi->s_mount_opt, ERRORS_CONT); | |
ac27a0ec DK |
1624 | |
1625 | sbi->s_resuid = le16_to_cpu(es->s_def_resuid); | |
1626 | sbi->s_resgid = le16_to_cpu(es->s_def_resgid); | |
1627 | ||
1628 | set_opt(sbi->s_mount_opt, RESERVATION); | |
1629 | ||
1e2462f9 MC |
1630 | /* |
1631 | * turn on extents feature by default in ext4 filesystem | |
1632 | * User -o noextents to turn it off | |
1633 | */ | |
1634 | set_opt(sbi->s_mount_opt, EXTENTS); | |
1635 | ||
ac27a0ec DK |
1636 | if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum, |
1637 | NULL, 0)) | |
1638 | goto failed_mount; | |
1639 | ||
1640 | sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | | |
617ba13b | 1641 | ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0); |
ac27a0ec | 1642 | |
617ba13b MC |
1643 | if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV && |
1644 | (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) || | |
1645 | EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) || | |
1646 | EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U))) | |
ac27a0ec | 1647 | printk(KERN_WARNING |
617ba13b | 1648 | "EXT4-fs warning: feature flags set on rev 0 fs, " |
ac27a0ec DK |
1649 | "running e2fsck is recommended\n"); |
1650 | /* | |
1651 | * Check feature flags regardless of the revision level, since we | |
1652 | * previously didn't change the revision level when setting the flags, | |
1653 | * so there is a chance incompat flags are set on a rev 0 filesystem. | |
1654 | */ | |
617ba13b | 1655 | features = EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP); |
ac27a0ec | 1656 | if (features) { |
617ba13b | 1657 | printk(KERN_ERR "EXT4-fs: %s: couldn't mount because of " |
ac27a0ec DK |
1658 | "unsupported optional features (%x).\n", |
1659 | sb->s_id, le32_to_cpu(features)); | |
1660 | goto failed_mount; | |
1661 | } | |
617ba13b | 1662 | features = EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP); |
ac27a0ec | 1663 | if (!(sb->s_flags & MS_RDONLY) && features) { |
617ba13b | 1664 | printk(KERN_ERR "EXT4-fs: %s: couldn't mount RDWR because of " |
ac27a0ec DK |
1665 | "unsupported optional features (%x).\n", |
1666 | sb->s_id, le32_to_cpu(features)); | |
1667 | goto failed_mount; | |
1668 | } | |
1669 | blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size); | |
1670 | ||
617ba13b MC |
1671 | if (blocksize < EXT4_MIN_BLOCK_SIZE || |
1672 | blocksize > EXT4_MAX_BLOCK_SIZE) { | |
ac27a0ec | 1673 | printk(KERN_ERR |
617ba13b | 1674 | "EXT4-fs: Unsupported filesystem blocksize %d on %s.\n", |
ac27a0ec DK |
1675 | blocksize, sb->s_id); |
1676 | goto failed_mount; | |
1677 | } | |
1678 | ||
1679 | hblock = bdev_hardsect_size(sb->s_bdev); | |
1680 | if (sb->s_blocksize != blocksize) { | |
1681 | /* | |
1682 | * Make sure the blocksize for the filesystem is larger | |
1683 | * than the hardware sectorsize for the machine. | |
1684 | */ | |
1685 | if (blocksize < hblock) { | |
617ba13b | 1686 | printk(KERN_ERR "EXT4-fs: blocksize %d too small for " |
ac27a0ec DK |
1687 | "device blocksize %d.\n", blocksize, hblock); |
1688 | goto failed_mount; | |
1689 | } | |
1690 | ||
1691 | brelse (bh); | |
1692 | sb_set_blocksize(sb, blocksize); | |
70bbb3e0 AM |
1693 | logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE; |
1694 | offset = do_div(logical_sb_block, blocksize); | |
1695 | bh = sb_bread(sb, logical_sb_block); | |
ac27a0ec DK |
1696 | if (!bh) { |
1697 | printk(KERN_ERR | |
617ba13b | 1698 | "EXT4-fs: Can't read superblock on 2nd try.\n"); |
ac27a0ec DK |
1699 | goto failed_mount; |
1700 | } | |
617ba13b | 1701 | es = (struct ext4_super_block *)(((char *)bh->b_data) + offset); |
ac27a0ec | 1702 | sbi->s_es = es; |
617ba13b | 1703 | if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) { |
ac27a0ec | 1704 | printk (KERN_ERR |
617ba13b | 1705 | "EXT4-fs: Magic mismatch, very weird !\n"); |
ac27a0ec DK |
1706 | goto failed_mount; |
1707 | } | |
1708 | } | |
1709 | ||
617ba13b | 1710 | sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits); |
ac27a0ec | 1711 | |
617ba13b MC |
1712 | if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) { |
1713 | sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE; | |
1714 | sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO; | |
ac27a0ec DK |
1715 | } else { |
1716 | sbi->s_inode_size = le16_to_cpu(es->s_inode_size); | |
1717 | sbi->s_first_ino = le32_to_cpu(es->s_first_ino); | |
617ba13b | 1718 | if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) || |
1330593e | 1719 | (!is_power_of_2(sbi->s_inode_size)) || |
ac27a0ec DK |
1720 | (sbi->s_inode_size > blocksize)) { |
1721 | printk (KERN_ERR | |
617ba13b | 1722 | "EXT4-fs: unsupported inode size: %d\n", |
ac27a0ec DK |
1723 | sbi->s_inode_size); |
1724 | goto failed_mount; | |
1725 | } | |
ef7f3835 KS |
1726 | if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) |
1727 | sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2); | |
ac27a0ec | 1728 | } |
617ba13b | 1729 | sbi->s_frag_size = EXT4_MIN_FRAG_SIZE << |
ac27a0ec DK |
1730 | le32_to_cpu(es->s_log_frag_size); |
1731 | if (blocksize != sbi->s_frag_size) { | |
1732 | printk(KERN_ERR | |
617ba13b | 1733 | "EXT4-fs: fragsize %lu != blocksize %u (unsupported)\n", |
ac27a0ec DK |
1734 | sbi->s_frag_size, blocksize); |
1735 | goto failed_mount; | |
1736 | } | |
0d1ee42f AR |
1737 | sbi->s_desc_size = le16_to_cpu(es->s_desc_size); |
1738 | if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) { | |
8fadc143 | 1739 | if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT || |
0d1ee42f | 1740 | sbi->s_desc_size > EXT4_MAX_DESC_SIZE || |
d8ea6cf8 | 1741 | !is_power_of_2(sbi->s_desc_size)) { |
0d1ee42f | 1742 | printk(KERN_ERR |
8fadc143 | 1743 | "EXT4-fs: unsupported descriptor size %lu\n", |
0d1ee42f AR |
1744 | sbi->s_desc_size); |
1745 | goto failed_mount; | |
1746 | } | |
1747 | } else | |
1748 | sbi->s_desc_size = EXT4_MIN_DESC_SIZE; | |
ac27a0ec DK |
1749 | sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group); |
1750 | sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group); | |
1751 | sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group); | |
617ba13b MC |
1752 | if (EXT4_INODE_SIZE(sb) == 0) |
1753 | goto cantfind_ext4; | |
1754 | sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb); | |
ac27a0ec | 1755 | if (sbi->s_inodes_per_block == 0) |
617ba13b | 1756 | goto cantfind_ext4; |
ac27a0ec DK |
1757 | sbi->s_itb_per_group = sbi->s_inodes_per_group / |
1758 | sbi->s_inodes_per_block; | |
0d1ee42f | 1759 | sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb); |
ac27a0ec DK |
1760 | sbi->s_sbh = bh; |
1761 | sbi->s_mount_state = le16_to_cpu(es->s_state); | |
e57aa839 FW |
1762 | sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb)); |
1763 | sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb)); | |
ac27a0ec DK |
1764 | for (i=0; i < 4; i++) |
1765 | sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]); | |
1766 | sbi->s_def_hash_version = es->s_def_hash_version; | |
1767 | ||
1768 | if (sbi->s_blocks_per_group > blocksize * 8) { | |
1769 | printk (KERN_ERR | |
617ba13b | 1770 | "EXT4-fs: #blocks per group too big: %lu\n", |
ac27a0ec DK |
1771 | sbi->s_blocks_per_group); |
1772 | goto failed_mount; | |
1773 | } | |
1774 | if (sbi->s_frags_per_group > blocksize * 8) { | |
1775 | printk (KERN_ERR | |
617ba13b | 1776 | "EXT4-fs: #fragments per group too big: %lu\n", |
ac27a0ec DK |
1777 | sbi->s_frags_per_group); |
1778 | goto failed_mount; | |
1779 | } | |
1780 | if (sbi->s_inodes_per_group > blocksize * 8) { | |
1781 | printk (KERN_ERR | |
617ba13b | 1782 | "EXT4-fs: #inodes per group too big: %lu\n", |
ac27a0ec DK |
1783 | sbi->s_inodes_per_group); |
1784 | goto failed_mount; | |
1785 | } | |
1786 | ||
bd81d8ee | 1787 | if (ext4_blocks_count(es) > |
ac27a0ec | 1788 | (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) { |
617ba13b | 1789 | printk(KERN_ERR "EXT4-fs: filesystem on %s:" |
ac27a0ec DK |
1790 | " too large to mount safely\n", sb->s_id); |
1791 | if (sizeof(sector_t) < 8) | |
617ba13b | 1792 | printk(KERN_WARNING "EXT4-fs: CONFIG_LBD not " |
ac27a0ec DK |
1793 | "enabled\n"); |
1794 | goto failed_mount; | |
1795 | } | |
1796 | ||
617ba13b MC |
1797 | if (EXT4_BLOCKS_PER_GROUP(sb) == 0) |
1798 | goto cantfind_ext4; | |
bd81d8ee LV |
1799 | blocks_count = (ext4_blocks_count(es) - |
1800 | le32_to_cpu(es->s_first_data_block) + | |
1801 | EXT4_BLOCKS_PER_GROUP(sb) - 1); | |
1802 | do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb)); | |
1803 | sbi->s_groups_count = blocks_count; | |
617ba13b MC |
1804 | db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) / |
1805 | EXT4_DESC_PER_BLOCK(sb); | |
ac27a0ec DK |
1806 | sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *), |
1807 | GFP_KERNEL); | |
1808 | if (sbi->s_group_desc == NULL) { | |
617ba13b | 1809 | printk (KERN_ERR "EXT4-fs: not enough memory\n"); |
ac27a0ec DK |
1810 | goto failed_mount; |
1811 | } | |
1812 | ||
1813 | bgl_lock_init(&sbi->s_blockgroup_lock); | |
1814 | ||
1815 | for (i = 0; i < db_count; i++) { | |
70bbb3e0 | 1816 | block = descriptor_loc(sb, logical_sb_block, i); |
ac27a0ec DK |
1817 | sbi->s_group_desc[i] = sb_bread(sb, block); |
1818 | if (!sbi->s_group_desc[i]) { | |
617ba13b | 1819 | printk (KERN_ERR "EXT4-fs: " |
ac27a0ec DK |
1820 | "can't read group descriptor %d\n", i); |
1821 | db_count = i; | |
1822 | goto failed_mount2; | |
1823 | } | |
1824 | } | |
617ba13b MC |
1825 | if (!ext4_check_descriptors (sb)) { |
1826 | printk(KERN_ERR "EXT4-fs: group descriptors corrupted!\n"); | |
ac27a0ec DK |
1827 | goto failed_mount2; |
1828 | } | |
1829 | sbi->s_gdb_count = db_count; | |
1830 | get_random_bytes(&sbi->s_next_generation, sizeof(u32)); | |
1831 | spin_lock_init(&sbi->s_next_gen_lock); | |
1832 | ||
833f4077 PZ |
1833 | err = percpu_counter_init(&sbi->s_freeblocks_counter, |
1834 | ext4_count_free_blocks(sb)); | |
1835 | if (!err) { | |
1836 | err = percpu_counter_init(&sbi->s_freeinodes_counter, | |
1837 | ext4_count_free_inodes(sb)); | |
1838 | } | |
1839 | if (!err) { | |
1840 | err = percpu_counter_init(&sbi->s_dirs_counter, | |
1841 | ext4_count_dirs(sb)); | |
1842 | } | |
1843 | if (err) { | |
1844 | printk(KERN_ERR "EXT4-fs: insufficient memory\n"); | |
1845 | goto failed_mount3; | |
1846 | } | |
ac27a0ec DK |
1847 | |
1848 | /* per fileystem reservation list head & lock */ | |
1849 | spin_lock_init(&sbi->s_rsv_window_lock); | |
1850 | sbi->s_rsv_window_root = RB_ROOT; | |
1851 | /* Add a single, static dummy reservation to the start of the | |
1852 | * reservation window list --- it gives us a placeholder for | |
1853 | * append-at-start-of-list which makes the allocation logic | |
1854 | * _much_ simpler. */ | |
617ba13b MC |
1855 | sbi->s_rsv_window_head.rsv_start = EXT4_RESERVE_WINDOW_NOT_ALLOCATED; |
1856 | sbi->s_rsv_window_head.rsv_end = EXT4_RESERVE_WINDOW_NOT_ALLOCATED; | |
ac27a0ec DK |
1857 | sbi->s_rsv_window_head.rsv_alloc_hit = 0; |
1858 | sbi->s_rsv_window_head.rsv_goal_size = 0; | |
617ba13b | 1859 | ext4_rsv_window_add(sb, &sbi->s_rsv_window_head); |
ac27a0ec DK |
1860 | |
1861 | /* | |
1862 | * set up enough so that it can read an inode | |
1863 | */ | |
617ba13b MC |
1864 | sb->s_op = &ext4_sops; |
1865 | sb->s_export_op = &ext4_export_ops; | |
1866 | sb->s_xattr = ext4_xattr_handlers; | |
ac27a0ec | 1867 | #ifdef CONFIG_QUOTA |
617ba13b MC |
1868 | sb->s_qcop = &ext4_qctl_operations; |
1869 | sb->dq_op = &ext4_quota_operations; | |
ac27a0ec DK |
1870 | #endif |
1871 | INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */ | |
1872 | ||
1873 | sb->s_root = NULL; | |
1874 | ||
1875 | needs_recovery = (es->s_last_orphan != 0 || | |
617ba13b MC |
1876 | EXT4_HAS_INCOMPAT_FEATURE(sb, |
1877 | EXT4_FEATURE_INCOMPAT_RECOVER)); | |
ac27a0ec DK |
1878 | |
1879 | /* | |
1880 | * The first inode we look at is the journal inode. Don't try | |
1881 | * root first: it may be modified in the journal! | |
1882 | */ | |
1883 | if (!test_opt(sb, NOLOAD) && | |
617ba13b MC |
1884 | EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) { |
1885 | if (ext4_load_journal(sb, es, journal_devnum)) | |
ac27a0ec DK |
1886 | goto failed_mount3; |
1887 | } else if (journal_inum) { | |
617ba13b | 1888 | if (ext4_create_journal(sb, es, journal_inum)) |
ac27a0ec DK |
1889 | goto failed_mount3; |
1890 | } else { | |
1891 | if (!silent) | |
1892 | printk (KERN_ERR | |
617ba13b | 1893 | "ext4: No journal on filesystem on %s\n", |
ac27a0ec DK |
1894 | sb->s_id); |
1895 | goto failed_mount3; | |
1896 | } | |
1897 | ||
eb40a09c JS |
1898 | if (ext4_blocks_count(es) > 0xffffffffULL && |
1899 | !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0, | |
1900 | JBD2_FEATURE_INCOMPAT_64BIT)) { | |
1901 | printk(KERN_ERR "ext4: Failed to set 64-bit journal feature\n"); | |
1902 | goto failed_mount4; | |
1903 | } | |
1904 | ||
ac27a0ec DK |
1905 | /* We have now updated the journal if required, so we can |
1906 | * validate the data journaling mode. */ | |
1907 | switch (test_opt(sb, DATA_FLAGS)) { | |
1908 | case 0: | |
1909 | /* No mode set, assume a default based on the journal | |
63f57933 AM |
1910 | * capabilities: ORDERED_DATA if the journal can |
1911 | * cope, else JOURNAL_DATA | |
1912 | */ | |
dab291af MC |
1913 | if (jbd2_journal_check_available_features |
1914 | (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) | |
ac27a0ec DK |
1915 | set_opt(sbi->s_mount_opt, ORDERED_DATA); |
1916 | else | |
1917 | set_opt(sbi->s_mount_opt, JOURNAL_DATA); | |
1918 | break; | |
1919 | ||
617ba13b MC |
1920 | case EXT4_MOUNT_ORDERED_DATA: |
1921 | case EXT4_MOUNT_WRITEBACK_DATA: | |
dab291af MC |
1922 | if (!jbd2_journal_check_available_features |
1923 | (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) { | |
617ba13b | 1924 | printk(KERN_ERR "EXT4-fs: Journal does not support " |
ac27a0ec DK |
1925 | "requested data journaling mode\n"); |
1926 | goto failed_mount4; | |
1927 | } | |
1928 | default: | |
1929 | break; | |
1930 | } | |
1931 | ||
1932 | if (test_opt(sb, NOBH)) { | |
617ba13b MC |
1933 | if (!(test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)) { |
1934 | printk(KERN_WARNING "EXT4-fs: Ignoring nobh option - " | |
ac27a0ec DK |
1935 | "its supported only with writeback mode\n"); |
1936 | clear_opt(sbi->s_mount_opt, NOBH); | |
1937 | } | |
1938 | } | |
1939 | /* | |
dab291af | 1940 | * The jbd2_journal_load will have done any necessary log recovery, |
ac27a0ec DK |
1941 | * so we can safely mount the rest of the filesystem now. |
1942 | */ | |
1943 | ||
617ba13b | 1944 | root = iget(sb, EXT4_ROOT_INO); |
ac27a0ec DK |
1945 | sb->s_root = d_alloc_root(root); |
1946 | if (!sb->s_root) { | |
617ba13b | 1947 | printk(KERN_ERR "EXT4-fs: get root inode failed\n"); |
ac27a0ec DK |
1948 | iput(root); |
1949 | goto failed_mount4; | |
1950 | } | |
1951 | if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { | |
1952 | dput(sb->s_root); | |
1953 | sb->s_root = NULL; | |
617ba13b | 1954 | printk(KERN_ERR "EXT4-fs: corrupt root inode, run e2fsck\n"); |
ac27a0ec DK |
1955 | goto failed_mount4; |
1956 | } | |
1957 | ||
617ba13b | 1958 | ext4_setup_super (sb, es, sb->s_flags & MS_RDONLY); |
ef7f3835 KS |
1959 | |
1960 | /* determine the minimum size of new large inodes, if present */ | |
1961 | if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) { | |
1962 | sbi->s_want_extra_isize = sizeof(struct ext4_inode) - | |
1963 | EXT4_GOOD_OLD_INODE_SIZE; | |
1964 | if (EXT4_HAS_RO_COMPAT_FEATURE(sb, | |
1965 | EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) { | |
1966 | if (sbi->s_want_extra_isize < | |
1967 | le16_to_cpu(es->s_want_extra_isize)) | |
1968 | sbi->s_want_extra_isize = | |
1969 | le16_to_cpu(es->s_want_extra_isize); | |
1970 | if (sbi->s_want_extra_isize < | |
1971 | le16_to_cpu(es->s_min_extra_isize)) | |
1972 | sbi->s_want_extra_isize = | |
1973 | le16_to_cpu(es->s_min_extra_isize); | |
1974 | } | |
1975 | } | |
1976 | /* Check if enough inode space is available */ | |
1977 | if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize > | |
1978 | sbi->s_inode_size) { | |
1979 | sbi->s_want_extra_isize = sizeof(struct ext4_inode) - | |
1980 | EXT4_GOOD_OLD_INODE_SIZE; | |
1981 | printk(KERN_INFO "EXT4-fs: required extra inode space not" | |
1982 | "available.\n"); | |
1983 | } | |
1984 | ||
ac27a0ec DK |
1985 | /* |
1986 | * akpm: core read_super() calls in here with the superblock locked. | |
1987 | * That deadlocks, because orphan cleanup needs to lock the superblock | |
1988 | * in numerous places. Here we just pop the lock - it's relatively | |
1989 | * harmless, because we are now ready to accept write_super() requests, | |
1990 | * and aviro says that's the only reason for hanging onto the | |
1991 | * superblock lock. | |
1992 | */ | |
617ba13b MC |
1993 | EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS; |
1994 | ext4_orphan_cleanup(sb, es); | |
1995 | EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS; | |
ac27a0ec | 1996 | if (needs_recovery) |
617ba13b MC |
1997 | printk (KERN_INFO "EXT4-fs: recovery complete.\n"); |
1998 | ext4_mark_recovery_complete(sb, es); | |
1999 | printk (KERN_INFO "EXT4-fs: mounted filesystem with %s data mode.\n", | |
2000 | test_opt(sb,DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA ? "journal": | |
2001 | test_opt(sb,DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA ? "ordered": | |
ac27a0ec DK |
2002 | "writeback"); |
2003 | ||
a86c6181 AT |
2004 | ext4_ext_init(sb); |
2005 | ||
ac27a0ec DK |
2006 | lock_kernel(); |
2007 | return 0; | |
2008 | ||
617ba13b | 2009 | cantfind_ext4: |
ac27a0ec | 2010 | if (!silent) |
617ba13b | 2011 | printk(KERN_ERR "VFS: Can't find ext4 filesystem on dev %s.\n", |
ac27a0ec DK |
2012 | sb->s_id); |
2013 | goto failed_mount; | |
2014 | ||
2015 | failed_mount4: | |
dab291af | 2016 | jbd2_journal_destroy(sbi->s_journal); |
ac27a0ec DK |
2017 | failed_mount3: |
2018 | percpu_counter_destroy(&sbi->s_freeblocks_counter); | |
2019 | percpu_counter_destroy(&sbi->s_freeinodes_counter); | |
2020 | percpu_counter_destroy(&sbi->s_dirs_counter); | |
2021 | failed_mount2: | |
2022 | for (i = 0; i < db_count; i++) | |
2023 | brelse(sbi->s_group_desc[i]); | |
2024 | kfree(sbi->s_group_desc); | |
2025 | failed_mount: | |
2026 | #ifdef CONFIG_QUOTA | |
2027 | for (i = 0; i < MAXQUOTAS; i++) | |
2028 | kfree(sbi->s_qf_names[i]); | |
2029 | #endif | |
617ba13b | 2030 | ext4_blkdev_remove(sbi); |
ac27a0ec DK |
2031 | brelse(bh); |
2032 | out_fail: | |
2033 | sb->s_fs_info = NULL; | |
2034 | kfree(sbi); | |
2035 | lock_kernel(); | |
2036 | return -EINVAL; | |
2037 | } | |
2038 | ||
2039 | /* | |
2040 | * Setup any per-fs journal parameters now. We'll do this both on | |
2041 | * initial mount, once the journal has been initialised but before we've | |
2042 | * done any recovery; and again on any subsequent remount. | |
2043 | */ | |
617ba13b | 2044 | static void ext4_init_journal_params(struct super_block *sb, journal_t *journal) |
ac27a0ec | 2045 | { |
617ba13b | 2046 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
ac27a0ec DK |
2047 | |
2048 | if (sbi->s_commit_interval) | |
2049 | journal->j_commit_interval = sbi->s_commit_interval; | |
617ba13b | 2050 | /* We could also set up an ext4-specific default for the commit |
ac27a0ec DK |
2051 | * interval here, but for now we'll just fall back to the jbd |
2052 | * default. */ | |
2053 | ||
2054 | spin_lock(&journal->j_state_lock); | |
2055 | if (test_opt(sb, BARRIER)) | |
dab291af | 2056 | journal->j_flags |= JBD2_BARRIER; |
ac27a0ec | 2057 | else |
dab291af | 2058 | journal->j_flags &= ~JBD2_BARRIER; |
ac27a0ec DK |
2059 | spin_unlock(&journal->j_state_lock); |
2060 | } | |
2061 | ||
617ba13b | 2062 | static journal_t *ext4_get_journal(struct super_block *sb, |
ac27a0ec DK |
2063 | unsigned int journal_inum) |
2064 | { | |
2065 | struct inode *journal_inode; | |
2066 | journal_t *journal; | |
2067 | ||
2068 | /* First, test for the existence of a valid inode on disk. Bad | |
2069 | * things happen if we iget() an unused inode, as the subsequent | |
2070 | * iput() will try to delete it. */ | |
2071 | ||
2072 | journal_inode = iget(sb, journal_inum); | |
2073 | if (!journal_inode) { | |
617ba13b | 2074 | printk(KERN_ERR "EXT4-fs: no journal found.\n"); |
ac27a0ec DK |
2075 | return NULL; |
2076 | } | |
2077 | if (!journal_inode->i_nlink) { | |
2078 | make_bad_inode(journal_inode); | |
2079 | iput(journal_inode); | |
617ba13b | 2080 | printk(KERN_ERR "EXT4-fs: journal inode is deleted.\n"); |
ac27a0ec DK |
2081 | return NULL; |
2082 | } | |
2083 | ||
2084 | jbd_debug(2, "Journal inode found at %p: %Ld bytes\n", | |
2085 | journal_inode, journal_inode->i_size); | |
2086 | if (is_bad_inode(journal_inode) || !S_ISREG(journal_inode->i_mode)) { | |
617ba13b | 2087 | printk(KERN_ERR "EXT4-fs: invalid journal inode.\n"); |
ac27a0ec DK |
2088 | iput(journal_inode); |
2089 | return NULL; | |
2090 | } | |
2091 | ||
dab291af | 2092 | journal = jbd2_journal_init_inode(journal_inode); |
ac27a0ec | 2093 | if (!journal) { |
617ba13b | 2094 | printk(KERN_ERR "EXT4-fs: Could not load journal inode\n"); |
ac27a0ec DK |
2095 | iput(journal_inode); |
2096 | return NULL; | |
2097 | } | |
2098 | journal->j_private = sb; | |
617ba13b | 2099 | ext4_init_journal_params(sb, journal); |
ac27a0ec DK |
2100 | return journal; |
2101 | } | |
2102 | ||
617ba13b | 2103 | static journal_t *ext4_get_dev_journal(struct super_block *sb, |
ac27a0ec DK |
2104 | dev_t j_dev) |
2105 | { | |
2106 | struct buffer_head * bh; | |
2107 | journal_t *journal; | |
617ba13b MC |
2108 | ext4_fsblk_t start; |
2109 | ext4_fsblk_t len; | |
ac27a0ec | 2110 | int hblock, blocksize; |
617ba13b | 2111 | ext4_fsblk_t sb_block; |
ac27a0ec | 2112 | unsigned long offset; |
617ba13b | 2113 | struct ext4_super_block * es; |
ac27a0ec DK |
2114 | struct block_device *bdev; |
2115 | ||
617ba13b | 2116 | bdev = ext4_blkdev_get(j_dev); |
ac27a0ec DK |
2117 | if (bdev == NULL) |
2118 | return NULL; | |
2119 | ||
2120 | if (bd_claim(bdev, sb)) { | |
2121 | printk(KERN_ERR | |
8c55e204 | 2122 | "EXT4: failed to claim external journal device.\n"); |
ac27a0ec DK |
2123 | blkdev_put(bdev); |
2124 | return NULL; | |
2125 | } | |
2126 | ||
2127 | blocksize = sb->s_blocksize; | |
2128 | hblock = bdev_hardsect_size(bdev); | |
2129 | if (blocksize < hblock) { | |
2130 | printk(KERN_ERR | |
617ba13b | 2131 | "EXT4-fs: blocksize too small for journal device.\n"); |
ac27a0ec DK |
2132 | goto out_bdev; |
2133 | } | |
2134 | ||
617ba13b MC |
2135 | sb_block = EXT4_MIN_BLOCK_SIZE / blocksize; |
2136 | offset = EXT4_MIN_BLOCK_SIZE % blocksize; | |
ac27a0ec DK |
2137 | set_blocksize(bdev, blocksize); |
2138 | if (!(bh = __bread(bdev, sb_block, blocksize))) { | |
617ba13b | 2139 | printk(KERN_ERR "EXT4-fs: couldn't read superblock of " |
ac27a0ec DK |
2140 | "external journal\n"); |
2141 | goto out_bdev; | |
2142 | } | |
2143 | ||
617ba13b MC |
2144 | es = (struct ext4_super_block *) (((char *)bh->b_data) + offset); |
2145 | if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) || | |
ac27a0ec | 2146 | !(le32_to_cpu(es->s_feature_incompat) & |
617ba13b MC |
2147 | EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) { |
2148 | printk(KERN_ERR "EXT4-fs: external journal has " | |
ac27a0ec DK |
2149 | "bad superblock\n"); |
2150 | brelse(bh); | |
2151 | goto out_bdev; | |
2152 | } | |
2153 | ||
617ba13b MC |
2154 | if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) { |
2155 | printk(KERN_ERR "EXT4-fs: journal UUID does not match\n"); | |
ac27a0ec DK |
2156 | brelse(bh); |
2157 | goto out_bdev; | |
2158 | } | |
2159 | ||
bd81d8ee | 2160 | len = ext4_blocks_count(es); |
ac27a0ec DK |
2161 | start = sb_block + 1; |
2162 | brelse(bh); /* we're done with the superblock */ | |
2163 | ||
dab291af | 2164 | journal = jbd2_journal_init_dev(bdev, sb->s_bdev, |
ac27a0ec DK |
2165 | start, len, blocksize); |
2166 | if (!journal) { | |
617ba13b | 2167 | printk(KERN_ERR "EXT4-fs: failed to create device journal\n"); |
ac27a0ec DK |
2168 | goto out_bdev; |
2169 | } | |
2170 | journal->j_private = sb; | |
2171 | ll_rw_block(READ, 1, &journal->j_sb_buffer); | |
2172 | wait_on_buffer(journal->j_sb_buffer); | |
2173 | if (!buffer_uptodate(journal->j_sb_buffer)) { | |
617ba13b | 2174 | printk(KERN_ERR "EXT4-fs: I/O error on journal device\n"); |
ac27a0ec DK |
2175 | goto out_journal; |
2176 | } | |
2177 | if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) { | |
617ba13b | 2178 | printk(KERN_ERR "EXT4-fs: External journal has more than one " |
ac27a0ec DK |
2179 | "user (unsupported) - %d\n", |
2180 | be32_to_cpu(journal->j_superblock->s_nr_users)); | |
2181 | goto out_journal; | |
2182 | } | |
617ba13b MC |
2183 | EXT4_SB(sb)->journal_bdev = bdev; |
2184 | ext4_init_journal_params(sb, journal); | |
ac27a0ec DK |
2185 | return journal; |
2186 | out_journal: | |
dab291af | 2187 | jbd2_journal_destroy(journal); |
ac27a0ec | 2188 | out_bdev: |
617ba13b | 2189 | ext4_blkdev_put(bdev); |
ac27a0ec DK |
2190 | return NULL; |
2191 | } | |
2192 | ||
617ba13b MC |
2193 | static int ext4_load_journal(struct super_block *sb, |
2194 | struct ext4_super_block *es, | |
ac27a0ec DK |
2195 | unsigned long journal_devnum) |
2196 | { | |
2197 | journal_t *journal; | |
2198 | unsigned int journal_inum = le32_to_cpu(es->s_journal_inum); | |
2199 | dev_t journal_dev; | |
2200 | int err = 0; | |
2201 | int really_read_only; | |
2202 | ||
2203 | if (journal_devnum && | |
2204 | journal_devnum != le32_to_cpu(es->s_journal_dev)) { | |
617ba13b | 2205 | printk(KERN_INFO "EXT4-fs: external journal device major/minor " |
ac27a0ec DK |
2206 | "numbers have changed\n"); |
2207 | journal_dev = new_decode_dev(journal_devnum); | |
2208 | } else | |
2209 | journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev)); | |
2210 | ||
2211 | really_read_only = bdev_read_only(sb->s_bdev); | |
2212 | ||
2213 | /* | |
2214 | * Are we loading a blank journal or performing recovery after a | |
2215 | * crash? For recovery, we need to check in advance whether we | |
2216 | * can get read-write access to the device. | |
2217 | */ | |
2218 | ||
617ba13b | 2219 | if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) { |
ac27a0ec | 2220 | if (sb->s_flags & MS_RDONLY) { |
617ba13b | 2221 | printk(KERN_INFO "EXT4-fs: INFO: recovery " |
ac27a0ec DK |
2222 | "required on readonly filesystem.\n"); |
2223 | if (really_read_only) { | |
617ba13b | 2224 | printk(KERN_ERR "EXT4-fs: write access " |
ac27a0ec DK |
2225 | "unavailable, cannot proceed.\n"); |
2226 | return -EROFS; | |
2227 | } | |
617ba13b | 2228 | printk (KERN_INFO "EXT4-fs: write access will " |
ac27a0ec DK |
2229 | "be enabled during recovery.\n"); |
2230 | } | |
2231 | } | |
2232 | ||
2233 | if (journal_inum && journal_dev) { | |
617ba13b | 2234 | printk(KERN_ERR "EXT4-fs: filesystem has both journal " |
ac27a0ec DK |
2235 | "and inode journals!\n"); |
2236 | return -EINVAL; | |
2237 | } | |
2238 | ||
2239 | if (journal_inum) { | |
617ba13b | 2240 | if (!(journal = ext4_get_journal(sb, journal_inum))) |
ac27a0ec DK |
2241 | return -EINVAL; |
2242 | } else { | |
617ba13b | 2243 | if (!(journal = ext4_get_dev_journal(sb, journal_dev))) |
ac27a0ec DK |
2244 | return -EINVAL; |
2245 | } | |
2246 | ||
2247 | if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) { | |
dab291af | 2248 | err = jbd2_journal_update_format(journal); |
ac27a0ec | 2249 | if (err) { |
617ba13b | 2250 | printk(KERN_ERR "EXT4-fs: error updating journal.\n"); |
dab291af | 2251 | jbd2_journal_destroy(journal); |
ac27a0ec DK |
2252 | return err; |
2253 | } | |
2254 | } | |
2255 | ||
617ba13b | 2256 | if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) |
dab291af | 2257 | err = jbd2_journal_wipe(journal, !really_read_only); |
ac27a0ec | 2258 | if (!err) |
dab291af | 2259 | err = jbd2_journal_load(journal); |
ac27a0ec DK |
2260 | |
2261 | if (err) { | |
617ba13b | 2262 | printk(KERN_ERR "EXT4-fs: error loading journal.\n"); |
dab291af | 2263 | jbd2_journal_destroy(journal); |
ac27a0ec DK |
2264 | return err; |
2265 | } | |
2266 | ||
617ba13b MC |
2267 | EXT4_SB(sb)->s_journal = journal; |
2268 | ext4_clear_journal_err(sb, es); | |
ac27a0ec DK |
2269 | |
2270 | if (journal_devnum && | |
2271 | journal_devnum != le32_to_cpu(es->s_journal_dev)) { | |
2272 | es->s_journal_dev = cpu_to_le32(journal_devnum); | |
2273 | sb->s_dirt = 1; | |
2274 | ||
2275 | /* Make sure we flush the recovery flag to disk. */ | |
617ba13b | 2276 | ext4_commit_super(sb, es, 1); |
ac27a0ec DK |
2277 | } |
2278 | ||
2279 | return 0; | |
2280 | } | |
2281 | ||
617ba13b MC |
2282 | static int ext4_create_journal(struct super_block * sb, |
2283 | struct ext4_super_block * es, | |
ac27a0ec DK |
2284 | unsigned int journal_inum) |
2285 | { | |
2286 | journal_t *journal; | |
6c675bd4 | 2287 | int err; |
ac27a0ec DK |
2288 | |
2289 | if (sb->s_flags & MS_RDONLY) { | |
617ba13b | 2290 | printk(KERN_ERR "EXT4-fs: readonly filesystem when trying to " |
ac27a0ec DK |
2291 | "create journal.\n"); |
2292 | return -EROFS; | |
2293 | } | |
2294 | ||
6c675bd4 BP |
2295 | journal = ext4_get_journal(sb, journal_inum); |
2296 | if (!journal) | |
ac27a0ec DK |
2297 | return -EINVAL; |
2298 | ||
617ba13b | 2299 | printk(KERN_INFO "EXT4-fs: creating new journal on inode %u\n", |
ac27a0ec DK |
2300 | journal_inum); |
2301 | ||
6c675bd4 BP |
2302 | err = jbd2_journal_create(journal); |
2303 | if (err) { | |
617ba13b | 2304 | printk(KERN_ERR "EXT4-fs: error creating journal.\n"); |
dab291af | 2305 | jbd2_journal_destroy(journal); |
ac27a0ec DK |
2306 | return -EIO; |
2307 | } | |
2308 | ||
617ba13b | 2309 | EXT4_SB(sb)->s_journal = journal; |
ac27a0ec | 2310 | |
617ba13b MC |
2311 | ext4_update_dynamic_rev(sb); |
2312 | EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); | |
2313 | EXT4_SET_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL); | |
ac27a0ec DK |
2314 | |
2315 | es->s_journal_inum = cpu_to_le32(journal_inum); | |
2316 | sb->s_dirt = 1; | |
2317 | ||
2318 | /* Make sure we flush the recovery flag to disk. */ | |
617ba13b | 2319 | ext4_commit_super(sb, es, 1); |
ac27a0ec DK |
2320 | |
2321 | return 0; | |
2322 | } | |
2323 | ||
617ba13b MC |
2324 | static void ext4_commit_super (struct super_block * sb, |
2325 | struct ext4_super_block * es, | |
ac27a0ec DK |
2326 | int sync) |
2327 | { | |
617ba13b | 2328 | struct buffer_head *sbh = EXT4_SB(sb)->s_sbh; |
ac27a0ec DK |
2329 | |
2330 | if (!sbh) | |
2331 | return; | |
2332 | es->s_wtime = cpu_to_le32(get_seconds()); | |
bd81d8ee | 2333 | ext4_free_blocks_count_set(es, ext4_count_free_blocks(sb)); |
617ba13b | 2334 | es->s_free_inodes_count = cpu_to_le32(ext4_count_free_inodes(sb)); |
ac27a0ec DK |
2335 | BUFFER_TRACE(sbh, "marking dirty"); |
2336 | mark_buffer_dirty(sbh); | |
2337 | if (sync) | |
2338 | sync_dirty_buffer(sbh); | |
2339 | } | |
2340 | ||
2341 | ||
2342 | /* | |
2343 | * Have we just finished recovery? If so, and if we are mounting (or | |
2344 | * remounting) the filesystem readonly, then we will end up with a | |
2345 | * consistent fs on disk. Record that fact. | |
2346 | */ | |
617ba13b MC |
2347 | static void ext4_mark_recovery_complete(struct super_block * sb, |
2348 | struct ext4_super_block * es) | |
ac27a0ec | 2349 | { |
617ba13b | 2350 | journal_t *journal = EXT4_SB(sb)->s_journal; |
ac27a0ec | 2351 | |
dab291af MC |
2352 | jbd2_journal_lock_updates(journal); |
2353 | jbd2_journal_flush(journal); | |
32c37730 | 2354 | lock_super(sb); |
617ba13b | 2355 | if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) && |
ac27a0ec | 2356 | sb->s_flags & MS_RDONLY) { |
617ba13b | 2357 | EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); |
ac27a0ec | 2358 | sb->s_dirt = 0; |
617ba13b | 2359 | ext4_commit_super(sb, es, 1); |
ac27a0ec | 2360 | } |
32c37730 | 2361 | unlock_super(sb); |
dab291af | 2362 | jbd2_journal_unlock_updates(journal); |
ac27a0ec DK |
2363 | } |
2364 | ||
2365 | /* | |
2366 | * If we are mounting (or read-write remounting) a filesystem whose journal | |
2367 | * has recorded an error from a previous lifetime, move that error to the | |
2368 | * main filesystem now. | |
2369 | */ | |
617ba13b MC |
2370 | static void ext4_clear_journal_err(struct super_block * sb, |
2371 | struct ext4_super_block * es) | |
ac27a0ec DK |
2372 | { |
2373 | journal_t *journal; | |
2374 | int j_errno; | |
2375 | const char *errstr; | |
2376 | ||
617ba13b | 2377 | journal = EXT4_SB(sb)->s_journal; |
ac27a0ec DK |
2378 | |
2379 | /* | |
2380 | * Now check for any error status which may have been recorded in the | |
617ba13b | 2381 | * journal by a prior ext4_error() or ext4_abort() |
ac27a0ec DK |
2382 | */ |
2383 | ||
dab291af | 2384 | j_errno = jbd2_journal_errno(journal); |
ac27a0ec DK |
2385 | if (j_errno) { |
2386 | char nbuf[16]; | |
2387 | ||
617ba13b MC |
2388 | errstr = ext4_decode_error(sb, j_errno, nbuf); |
2389 | ext4_warning(sb, __FUNCTION__, "Filesystem error recorded " | |
ac27a0ec | 2390 | "from previous mount: %s", errstr); |
617ba13b | 2391 | ext4_warning(sb, __FUNCTION__, "Marking fs in need of " |
ac27a0ec DK |
2392 | "filesystem check."); |
2393 | ||
617ba13b MC |
2394 | EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; |
2395 | es->s_state |= cpu_to_le16(EXT4_ERROR_FS); | |
2396 | ext4_commit_super (sb, es, 1); | |
ac27a0ec | 2397 | |
dab291af | 2398 | jbd2_journal_clear_err(journal); |
ac27a0ec DK |
2399 | } |
2400 | } | |
2401 | ||
2402 | /* | |
2403 | * Force the running and committing transactions to commit, | |
2404 | * and wait on the commit. | |
2405 | */ | |
617ba13b | 2406 | int ext4_force_commit(struct super_block *sb) |
ac27a0ec DK |
2407 | { |
2408 | journal_t *journal; | |
2409 | int ret; | |
2410 | ||
2411 | if (sb->s_flags & MS_RDONLY) | |
2412 | return 0; | |
2413 | ||
617ba13b | 2414 | journal = EXT4_SB(sb)->s_journal; |
ac27a0ec | 2415 | sb->s_dirt = 0; |
617ba13b | 2416 | ret = ext4_journal_force_commit(journal); |
ac27a0ec DK |
2417 | return ret; |
2418 | } | |
2419 | ||
2420 | /* | |
617ba13b | 2421 | * Ext4 always journals updates to the superblock itself, so we don't |
ac27a0ec DK |
2422 | * have to propagate any other updates to the superblock on disk at this |
2423 | * point. Just start an async writeback to get the buffers on their way | |
2424 | * to the disk. | |
2425 | * | |
2426 | * This implicitly triggers the writebehind on sync(). | |
2427 | */ | |
2428 | ||
617ba13b | 2429 | static void ext4_write_super (struct super_block * sb) |
ac27a0ec DK |
2430 | { |
2431 | if (mutex_trylock(&sb->s_lock) != 0) | |
2432 | BUG(); | |
2433 | sb->s_dirt = 0; | |
2434 | } | |
2435 | ||
617ba13b | 2436 | static int ext4_sync_fs(struct super_block *sb, int wait) |
ac27a0ec DK |
2437 | { |
2438 | tid_t target; | |
2439 | ||
2440 | sb->s_dirt = 0; | |
dab291af | 2441 | if (jbd2_journal_start_commit(EXT4_SB(sb)->s_journal, &target)) { |
ac27a0ec | 2442 | if (wait) |
dab291af | 2443 | jbd2_log_wait_commit(EXT4_SB(sb)->s_journal, target); |
ac27a0ec DK |
2444 | } |
2445 | return 0; | |
2446 | } | |
2447 | ||
2448 | /* | |
2449 | * LVM calls this function before a (read-only) snapshot is created. This | |
2450 | * gives us a chance to flush the journal completely and mark the fs clean. | |
2451 | */ | |
617ba13b | 2452 | static void ext4_write_super_lockfs(struct super_block *sb) |
ac27a0ec DK |
2453 | { |
2454 | sb->s_dirt = 0; | |
2455 | ||
2456 | if (!(sb->s_flags & MS_RDONLY)) { | |
617ba13b | 2457 | journal_t *journal = EXT4_SB(sb)->s_journal; |
ac27a0ec DK |
2458 | |
2459 | /* Now we set up the journal barrier. */ | |
dab291af MC |
2460 | jbd2_journal_lock_updates(journal); |
2461 | jbd2_journal_flush(journal); | |
ac27a0ec DK |
2462 | |
2463 | /* Journal blocked and flushed, clear needs_recovery flag. */ | |
617ba13b MC |
2464 | EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); |
2465 | ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1); | |
ac27a0ec DK |
2466 | } |
2467 | } | |
2468 | ||
2469 | /* | |
2470 | * Called by LVM after the snapshot is done. We need to reset the RECOVER | |
2471 | * flag here, even though the filesystem is not technically dirty yet. | |
2472 | */ | |
617ba13b | 2473 | static void ext4_unlockfs(struct super_block *sb) |
ac27a0ec DK |
2474 | { |
2475 | if (!(sb->s_flags & MS_RDONLY)) { | |
2476 | lock_super(sb); | |
2477 | /* Reser the needs_recovery flag before the fs is unlocked. */ | |
617ba13b MC |
2478 | EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); |
2479 | ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1); | |
ac27a0ec | 2480 | unlock_super(sb); |
dab291af | 2481 | jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); |
ac27a0ec DK |
2482 | } |
2483 | } | |
2484 | ||
617ba13b | 2485 | static int ext4_remount (struct super_block * sb, int * flags, char * data) |
ac27a0ec | 2486 | { |
617ba13b MC |
2487 | struct ext4_super_block * es; |
2488 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
2489 | ext4_fsblk_t n_blocks_count = 0; | |
ac27a0ec | 2490 | unsigned long old_sb_flags; |
617ba13b | 2491 | struct ext4_mount_options old_opts; |
ac27a0ec DK |
2492 | int err; |
2493 | #ifdef CONFIG_QUOTA | |
2494 | int i; | |
2495 | #endif | |
2496 | ||
2497 | /* Store the original options */ | |
2498 | old_sb_flags = sb->s_flags; | |
2499 | old_opts.s_mount_opt = sbi->s_mount_opt; | |
2500 | old_opts.s_resuid = sbi->s_resuid; | |
2501 | old_opts.s_resgid = sbi->s_resgid; | |
2502 | old_opts.s_commit_interval = sbi->s_commit_interval; | |
2503 | #ifdef CONFIG_QUOTA | |
2504 | old_opts.s_jquota_fmt = sbi->s_jquota_fmt; | |
2505 | for (i = 0; i < MAXQUOTAS; i++) | |
2506 | old_opts.s_qf_names[i] = sbi->s_qf_names[i]; | |
2507 | #endif | |
2508 | ||
2509 | /* | |
2510 | * Allow the "check" option to be passed as a remount option. | |
2511 | */ | |
2512 | if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) { | |
2513 | err = -EINVAL; | |
2514 | goto restore_opts; | |
2515 | } | |
2516 | ||
617ba13b MC |
2517 | if (sbi->s_mount_opt & EXT4_MOUNT_ABORT) |
2518 | ext4_abort(sb, __FUNCTION__, "Abort forced by user"); | |
ac27a0ec DK |
2519 | |
2520 | sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | | |
617ba13b | 2521 | ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0); |
ac27a0ec DK |
2522 | |
2523 | es = sbi->s_es; | |
2524 | ||
617ba13b | 2525 | ext4_init_journal_params(sb, sbi->s_journal); |
ac27a0ec DK |
2526 | |
2527 | if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) || | |
bd81d8ee | 2528 | n_blocks_count > ext4_blocks_count(es)) { |
617ba13b | 2529 | if (sbi->s_mount_opt & EXT4_MOUNT_ABORT) { |
ac27a0ec DK |
2530 | err = -EROFS; |
2531 | goto restore_opts; | |
2532 | } | |
2533 | ||
2534 | if (*flags & MS_RDONLY) { | |
2535 | /* | |
2536 | * First of all, the unconditional stuff we have to do | |
2537 | * to disable replay of the journal when we next remount | |
2538 | */ | |
2539 | sb->s_flags |= MS_RDONLY; | |
2540 | ||
2541 | /* | |
2542 | * OK, test if we are remounting a valid rw partition | |
2543 | * readonly, and if so set the rdonly flag and then | |
2544 | * mark the partition as valid again. | |
2545 | */ | |
617ba13b MC |
2546 | if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) && |
2547 | (sbi->s_mount_state & EXT4_VALID_FS)) | |
ac27a0ec DK |
2548 | es->s_state = cpu_to_le16(sbi->s_mount_state); |
2549 | ||
32c37730 JK |
2550 | /* |
2551 | * We have to unlock super so that we can wait for | |
2552 | * transactions. | |
2553 | */ | |
2554 | unlock_super(sb); | |
617ba13b | 2555 | ext4_mark_recovery_complete(sb, es); |
32c37730 | 2556 | lock_super(sb); |
ac27a0ec DK |
2557 | } else { |
2558 | __le32 ret; | |
617ba13b MC |
2559 | if ((ret = EXT4_HAS_RO_COMPAT_FEATURE(sb, |
2560 | ~EXT4_FEATURE_RO_COMPAT_SUPP))) { | |
2561 | printk(KERN_WARNING "EXT4-fs: %s: couldn't " | |
ac27a0ec DK |
2562 | "remount RDWR because of unsupported " |
2563 | "optional features (%x).\n", | |
2564 | sb->s_id, le32_to_cpu(ret)); | |
2565 | err = -EROFS; | |
2566 | goto restore_opts; | |
2567 | } | |
ead6596b ES |
2568 | |
2569 | /* | |
2570 | * If we have an unprocessed orphan list hanging | |
2571 | * around from a previously readonly bdev mount, | |
2572 | * require a full umount/remount for now. | |
2573 | */ | |
2574 | if (es->s_last_orphan) { | |
2575 | printk(KERN_WARNING "EXT4-fs: %s: couldn't " | |
2576 | "remount RDWR because of unprocessed " | |
2577 | "orphan inode list. Please " | |
2578 | "umount/remount instead.\n", | |
2579 | sb->s_id); | |
2580 | err = -EINVAL; | |
2581 | goto restore_opts; | |
2582 | } | |
2583 | ||
ac27a0ec DK |
2584 | /* |
2585 | * Mounting a RDONLY partition read-write, so reread | |
2586 | * and store the current valid flag. (It may have | |
2587 | * been changed by e2fsck since we originally mounted | |
2588 | * the partition.) | |
2589 | */ | |
617ba13b | 2590 | ext4_clear_journal_err(sb, es); |
ac27a0ec | 2591 | sbi->s_mount_state = le16_to_cpu(es->s_state); |
617ba13b | 2592 | if ((err = ext4_group_extend(sb, es, n_blocks_count))) |
ac27a0ec | 2593 | goto restore_opts; |
617ba13b | 2594 | if (!ext4_setup_super (sb, es, 0)) |
ac27a0ec DK |
2595 | sb->s_flags &= ~MS_RDONLY; |
2596 | } | |
2597 | } | |
2598 | #ifdef CONFIG_QUOTA | |
2599 | /* Release old quota file names */ | |
2600 | for (i = 0; i < MAXQUOTAS; i++) | |
2601 | if (old_opts.s_qf_names[i] && | |
2602 | old_opts.s_qf_names[i] != sbi->s_qf_names[i]) | |
2603 | kfree(old_opts.s_qf_names[i]); | |
2604 | #endif | |
2605 | return 0; | |
2606 | restore_opts: | |
2607 | sb->s_flags = old_sb_flags; | |
2608 | sbi->s_mount_opt = old_opts.s_mount_opt; | |
2609 | sbi->s_resuid = old_opts.s_resuid; | |
2610 | sbi->s_resgid = old_opts.s_resgid; | |
2611 | sbi->s_commit_interval = old_opts.s_commit_interval; | |
2612 | #ifdef CONFIG_QUOTA | |
2613 | sbi->s_jquota_fmt = old_opts.s_jquota_fmt; | |
2614 | for (i = 0; i < MAXQUOTAS; i++) { | |
2615 | if (sbi->s_qf_names[i] && | |
2616 | old_opts.s_qf_names[i] != sbi->s_qf_names[i]) | |
2617 | kfree(sbi->s_qf_names[i]); | |
2618 | sbi->s_qf_names[i] = old_opts.s_qf_names[i]; | |
2619 | } | |
2620 | #endif | |
2621 | return err; | |
2622 | } | |
2623 | ||
617ba13b | 2624 | static int ext4_statfs (struct dentry * dentry, struct kstatfs * buf) |
ac27a0ec DK |
2625 | { |
2626 | struct super_block *sb = dentry->d_sb; | |
617ba13b MC |
2627 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
2628 | struct ext4_super_block *es = sbi->s_es; | |
960cc398 | 2629 | u64 fsid; |
ac27a0ec | 2630 | |
5e70030d BP |
2631 | if (test_opt(sb, MINIX_DF)) { |
2632 | sbi->s_overhead_last = 0; | |
2633 | } else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) { | |
2634 | unsigned long ngroups = sbi->s_groups_count, i; | |
2635 | ext4_fsblk_t overhead = 0; | |
ac27a0ec DK |
2636 | smp_rmb(); |
2637 | ||
2638 | /* | |
5e70030d BP |
2639 | * Compute the overhead (FS structures). This is constant |
2640 | * for a given filesystem unless the number of block groups | |
2641 | * changes so we cache the previous value until it does. | |
ac27a0ec DK |
2642 | */ |
2643 | ||
2644 | /* | |
2645 | * All of the blocks before first_data_block are | |
2646 | * overhead | |
2647 | */ | |
2648 | overhead = le32_to_cpu(es->s_first_data_block); | |
2649 | ||
2650 | /* | |
2651 | * Add the overhead attributed to the superblock and | |
2652 | * block group descriptors. If the sparse superblocks | |
2653 | * feature is turned on, then not all groups have this. | |
2654 | */ | |
2655 | for (i = 0; i < ngroups; i++) { | |
617ba13b MC |
2656 | overhead += ext4_bg_has_super(sb, i) + |
2657 | ext4_bg_num_gdb(sb, i); | |
ac27a0ec DK |
2658 | cond_resched(); |
2659 | } | |
2660 | ||
2661 | /* | |
2662 | * Every block group has an inode bitmap, a block | |
2663 | * bitmap, and an inode table. | |
2664 | */ | |
5e70030d BP |
2665 | overhead += ngroups * (2 + sbi->s_itb_per_group); |
2666 | sbi->s_overhead_last = overhead; | |
2667 | smp_wmb(); | |
2668 | sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count); | |
ac27a0ec DK |
2669 | } |
2670 | ||
617ba13b | 2671 | buf->f_type = EXT4_SUPER_MAGIC; |
ac27a0ec | 2672 | buf->f_bsize = sb->s_blocksize; |
5e70030d | 2673 | buf->f_blocks = ext4_blocks_count(es) - sbi->s_overhead_last; |
52d9f3b4 | 2674 | buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter); |
5e70030d | 2675 | es->s_free_blocks_count = cpu_to_le32(buf->f_bfree); |
bd81d8ee LV |
2676 | buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es); |
2677 | if (buf->f_bfree < ext4_r_blocks_count(es)) | |
ac27a0ec DK |
2678 | buf->f_bavail = 0; |
2679 | buf->f_files = le32_to_cpu(es->s_inodes_count); | |
52d9f3b4 | 2680 | buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter); |
5e70030d | 2681 | es->s_free_inodes_count = cpu_to_le32(buf->f_ffree); |
617ba13b | 2682 | buf->f_namelen = EXT4_NAME_LEN; |
960cc398 PE |
2683 | fsid = le64_to_cpup((void *)es->s_uuid) ^ |
2684 | le64_to_cpup((void *)es->s_uuid + sizeof(u64)); | |
2685 | buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL; | |
2686 | buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL; | |
ac27a0ec DK |
2687 | return 0; |
2688 | } | |
2689 | ||
2690 | /* Helper function for writing quotas on sync - we need to start transaction before quota file | |
2691 | * is locked for write. Otherwise the are possible deadlocks: | |
2692 | * Process 1 Process 2 | |
617ba13b | 2693 | * ext4_create() quota_sync() |
dab291af | 2694 | * jbd2_journal_start() write_dquot() |
ac27a0ec | 2695 | * DQUOT_INIT() down(dqio_mutex) |
dab291af | 2696 | * down(dqio_mutex) jbd2_journal_start() |
ac27a0ec DK |
2697 | * |
2698 | */ | |
2699 | ||
2700 | #ifdef CONFIG_QUOTA | |
2701 | ||
2702 | static inline struct inode *dquot_to_inode(struct dquot *dquot) | |
2703 | { | |
2704 | return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type]; | |
2705 | } | |
2706 | ||
617ba13b | 2707 | static int ext4_dquot_initialize(struct inode *inode, int type) |
ac27a0ec DK |
2708 | { |
2709 | handle_t *handle; | |
2710 | int ret, err; | |
2711 | ||
2712 | /* We may create quota structure so we need to reserve enough blocks */ | |
617ba13b | 2713 | handle = ext4_journal_start(inode, 2*EXT4_QUOTA_INIT_BLOCKS(inode->i_sb)); |
ac27a0ec DK |
2714 | if (IS_ERR(handle)) |
2715 | return PTR_ERR(handle); | |
2716 | ret = dquot_initialize(inode, type); | |
617ba13b | 2717 | err = ext4_journal_stop(handle); |
ac27a0ec DK |
2718 | if (!ret) |
2719 | ret = err; | |
2720 | return ret; | |
2721 | } | |
2722 | ||
617ba13b | 2723 | static int ext4_dquot_drop(struct inode *inode) |
ac27a0ec DK |
2724 | { |
2725 | handle_t *handle; | |
2726 | int ret, err; | |
2727 | ||
2728 | /* We may delete quota structure so we need to reserve enough blocks */ | |
617ba13b | 2729 | handle = ext4_journal_start(inode, 2*EXT4_QUOTA_DEL_BLOCKS(inode->i_sb)); |
ac27a0ec DK |
2730 | if (IS_ERR(handle)) |
2731 | return PTR_ERR(handle); | |
2732 | ret = dquot_drop(inode); | |
617ba13b | 2733 | err = ext4_journal_stop(handle); |
ac27a0ec DK |
2734 | if (!ret) |
2735 | ret = err; | |
2736 | return ret; | |
2737 | } | |
2738 | ||
617ba13b | 2739 | static int ext4_write_dquot(struct dquot *dquot) |
ac27a0ec DK |
2740 | { |
2741 | int ret, err; | |
2742 | handle_t *handle; | |
2743 | struct inode *inode; | |
2744 | ||
2745 | inode = dquot_to_inode(dquot); | |
617ba13b MC |
2746 | handle = ext4_journal_start(inode, |
2747 | EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb)); | |
ac27a0ec DK |
2748 | if (IS_ERR(handle)) |
2749 | return PTR_ERR(handle); | |
2750 | ret = dquot_commit(dquot); | |
617ba13b | 2751 | err = ext4_journal_stop(handle); |
ac27a0ec DK |
2752 | if (!ret) |
2753 | ret = err; | |
2754 | return ret; | |
2755 | } | |
2756 | ||
617ba13b | 2757 | static int ext4_acquire_dquot(struct dquot *dquot) |
ac27a0ec DK |
2758 | { |
2759 | int ret, err; | |
2760 | handle_t *handle; | |
2761 | ||
617ba13b MC |
2762 | handle = ext4_journal_start(dquot_to_inode(dquot), |
2763 | EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb)); | |
ac27a0ec DK |
2764 | if (IS_ERR(handle)) |
2765 | return PTR_ERR(handle); | |
2766 | ret = dquot_acquire(dquot); | |
617ba13b | 2767 | err = ext4_journal_stop(handle); |
ac27a0ec DK |
2768 | if (!ret) |
2769 | ret = err; | |
2770 | return ret; | |
2771 | } | |
2772 | ||
617ba13b | 2773 | static int ext4_release_dquot(struct dquot *dquot) |
ac27a0ec DK |
2774 | { |
2775 | int ret, err; | |
2776 | handle_t *handle; | |
2777 | ||
617ba13b MC |
2778 | handle = ext4_journal_start(dquot_to_inode(dquot), |
2779 | EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb)); | |
9c3013e9 JK |
2780 | if (IS_ERR(handle)) { |
2781 | /* Release dquot anyway to avoid endless cycle in dqput() */ | |
2782 | dquot_release(dquot); | |
ac27a0ec | 2783 | return PTR_ERR(handle); |
9c3013e9 | 2784 | } |
ac27a0ec | 2785 | ret = dquot_release(dquot); |
617ba13b | 2786 | err = ext4_journal_stop(handle); |
ac27a0ec DK |
2787 | if (!ret) |
2788 | ret = err; | |
2789 | return ret; | |
2790 | } | |
2791 | ||
617ba13b | 2792 | static int ext4_mark_dquot_dirty(struct dquot *dquot) |
ac27a0ec DK |
2793 | { |
2794 | /* Are we journalling quotas? */ | |
617ba13b MC |
2795 | if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] || |
2796 | EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) { | |
ac27a0ec | 2797 | dquot_mark_dquot_dirty(dquot); |
617ba13b | 2798 | return ext4_write_dquot(dquot); |
ac27a0ec DK |
2799 | } else { |
2800 | return dquot_mark_dquot_dirty(dquot); | |
2801 | } | |
2802 | } | |
2803 | ||
617ba13b | 2804 | static int ext4_write_info(struct super_block *sb, int type) |
ac27a0ec DK |
2805 | { |
2806 | int ret, err; | |
2807 | handle_t *handle; | |
2808 | ||
2809 | /* Data block + inode block */ | |
617ba13b | 2810 | handle = ext4_journal_start(sb->s_root->d_inode, 2); |
ac27a0ec DK |
2811 | if (IS_ERR(handle)) |
2812 | return PTR_ERR(handle); | |
2813 | ret = dquot_commit_info(sb, type); | |
617ba13b | 2814 | err = ext4_journal_stop(handle); |
ac27a0ec DK |
2815 | if (!ret) |
2816 | ret = err; | |
2817 | return ret; | |
2818 | } | |
2819 | ||
2820 | /* | |
2821 | * Turn on quotas during mount time - we need to find | |
2822 | * the quota file and such... | |
2823 | */ | |
617ba13b | 2824 | static int ext4_quota_on_mount(struct super_block *sb, int type) |
ac27a0ec | 2825 | { |
617ba13b MC |
2826 | return vfs_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type], |
2827 | EXT4_SB(sb)->s_jquota_fmt, type); | |
ac27a0ec DK |
2828 | } |
2829 | ||
2830 | /* | |
2831 | * Standard function to be called on quota_on | |
2832 | */ | |
617ba13b | 2833 | static int ext4_quota_on(struct super_block *sb, int type, int format_id, |
ac27a0ec DK |
2834 | char *path) |
2835 | { | |
2836 | int err; | |
2837 | struct nameidata nd; | |
2838 | ||
2839 | if (!test_opt(sb, QUOTA)) | |
2840 | return -EINVAL; | |
2841 | /* Not journalling quota? */ | |
617ba13b MC |
2842 | if (!EXT4_SB(sb)->s_qf_names[USRQUOTA] && |
2843 | !EXT4_SB(sb)->s_qf_names[GRPQUOTA]) | |
ac27a0ec DK |
2844 | return vfs_quota_on(sb, type, format_id, path); |
2845 | err = path_lookup(path, LOOKUP_FOLLOW, &nd); | |
2846 | if (err) | |
2847 | return err; | |
2848 | /* Quotafile not on the same filesystem? */ | |
2849 | if (nd.mnt->mnt_sb != sb) { | |
2850 | path_release(&nd); | |
2851 | return -EXDEV; | |
2852 | } | |
2853 | /* Quotafile not of fs root? */ | |
2854 | if (nd.dentry->d_parent->d_inode != sb->s_root->d_inode) | |
2855 | printk(KERN_WARNING | |
617ba13b | 2856 | "EXT4-fs: Quota file not on filesystem root. " |
ac27a0ec DK |
2857 | "Journalled quota will not work.\n"); |
2858 | path_release(&nd); | |
2859 | return vfs_quota_on(sb, type, format_id, path); | |
2860 | } | |
2861 | ||
2862 | /* Read data from quotafile - avoid pagecache and such because we cannot afford | |
2863 | * acquiring the locks... As quota files are never truncated and quota code | |
2864 | * itself serializes the operations (and noone else should touch the files) | |
2865 | * we don't have to be afraid of races */ | |
617ba13b | 2866 | static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data, |
ac27a0ec DK |
2867 | size_t len, loff_t off) |
2868 | { | |
2869 | struct inode *inode = sb_dqopt(sb)->files[type]; | |
617ba13b | 2870 | sector_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb); |
ac27a0ec DK |
2871 | int err = 0; |
2872 | int offset = off & (sb->s_blocksize - 1); | |
2873 | int tocopy; | |
2874 | size_t toread; | |
2875 | struct buffer_head *bh; | |
2876 | loff_t i_size = i_size_read(inode); | |
2877 | ||
2878 | if (off > i_size) | |
2879 | return 0; | |
2880 | if (off+len > i_size) | |
2881 | len = i_size-off; | |
2882 | toread = len; | |
2883 | while (toread > 0) { | |
2884 | tocopy = sb->s_blocksize - offset < toread ? | |
2885 | sb->s_blocksize - offset : toread; | |
617ba13b | 2886 | bh = ext4_bread(NULL, inode, blk, 0, &err); |
ac27a0ec DK |
2887 | if (err) |
2888 | return err; | |
2889 | if (!bh) /* A hole? */ | |
2890 | memset(data, 0, tocopy); | |
2891 | else | |
2892 | memcpy(data, bh->b_data+offset, tocopy); | |
2893 | brelse(bh); | |
2894 | offset = 0; | |
2895 | toread -= tocopy; | |
2896 | data += tocopy; | |
2897 | blk++; | |
2898 | } | |
2899 | return len; | |
2900 | } | |
2901 | ||
2902 | /* Write to quotafile (we know the transaction is already started and has | |
2903 | * enough credits) */ | |
617ba13b | 2904 | static ssize_t ext4_quota_write(struct super_block *sb, int type, |
ac27a0ec DK |
2905 | const char *data, size_t len, loff_t off) |
2906 | { | |
2907 | struct inode *inode = sb_dqopt(sb)->files[type]; | |
617ba13b | 2908 | sector_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb); |
ac27a0ec DK |
2909 | int err = 0; |
2910 | int offset = off & (sb->s_blocksize - 1); | |
2911 | int tocopy; | |
617ba13b | 2912 | int journal_quota = EXT4_SB(sb)->s_qf_names[type] != NULL; |
ac27a0ec DK |
2913 | size_t towrite = len; |
2914 | struct buffer_head *bh; | |
2915 | handle_t *handle = journal_current_handle(); | |
2916 | ||
9c3013e9 JK |
2917 | if (!handle) { |
2918 | printk(KERN_WARNING "EXT4-fs: Quota write (off=%Lu, len=%Lu)" | |
2919 | " cancelled because transaction is not started.\n", | |
2920 | (unsigned long long)off, (unsigned long long)len); | |
2921 | return -EIO; | |
2922 | } | |
ac27a0ec DK |
2923 | mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA); |
2924 | while (towrite > 0) { | |
2925 | tocopy = sb->s_blocksize - offset < towrite ? | |
2926 | sb->s_blocksize - offset : towrite; | |
617ba13b | 2927 | bh = ext4_bread(handle, inode, blk, 1, &err); |
ac27a0ec DK |
2928 | if (!bh) |
2929 | goto out; | |
2930 | if (journal_quota) { | |
617ba13b | 2931 | err = ext4_journal_get_write_access(handle, bh); |
ac27a0ec DK |
2932 | if (err) { |
2933 | brelse(bh); | |
2934 | goto out; | |
2935 | } | |
2936 | } | |
2937 | lock_buffer(bh); | |
2938 | memcpy(bh->b_data+offset, data, tocopy); | |
2939 | flush_dcache_page(bh->b_page); | |
2940 | unlock_buffer(bh); | |
2941 | if (journal_quota) | |
617ba13b | 2942 | err = ext4_journal_dirty_metadata(handle, bh); |
ac27a0ec DK |
2943 | else { |
2944 | /* Always do at least ordered writes for quotas */ | |
617ba13b | 2945 | err = ext4_journal_dirty_data(handle, bh); |
ac27a0ec DK |
2946 | mark_buffer_dirty(bh); |
2947 | } | |
2948 | brelse(bh); | |
2949 | if (err) | |
2950 | goto out; | |
2951 | offset = 0; | |
2952 | towrite -= tocopy; | |
2953 | data += tocopy; | |
2954 | blk++; | |
2955 | } | |
2956 | out: | |
2957 | if (len == towrite) | |
2958 | return err; | |
2959 | if (inode->i_size < off+len-towrite) { | |
2960 | i_size_write(inode, off+len-towrite); | |
617ba13b | 2961 | EXT4_I(inode)->i_disksize = inode->i_size; |
ac27a0ec DK |
2962 | } |
2963 | inode->i_version++; | |
2964 | inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
617ba13b | 2965 | ext4_mark_inode_dirty(handle, inode); |
ac27a0ec DK |
2966 | mutex_unlock(&inode->i_mutex); |
2967 | return len - towrite; | |
2968 | } | |
2969 | ||
2970 | #endif | |
2971 | ||
617ba13b | 2972 | static int ext4_get_sb(struct file_system_type *fs_type, |
ac27a0ec DK |
2973 | int flags, const char *dev_name, void *data, struct vfsmount *mnt) |
2974 | { | |
617ba13b | 2975 | return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super, mnt); |
ac27a0ec DK |
2976 | } |
2977 | ||
617ba13b | 2978 | static struct file_system_type ext4dev_fs_type = { |
ac27a0ec | 2979 | .owner = THIS_MODULE, |
617ba13b MC |
2980 | .name = "ext4dev", |
2981 | .get_sb = ext4_get_sb, | |
ac27a0ec DK |
2982 | .kill_sb = kill_block_super, |
2983 | .fs_flags = FS_REQUIRES_DEV, | |
2984 | }; | |
2985 | ||
617ba13b | 2986 | static int __init init_ext4_fs(void) |
ac27a0ec | 2987 | { |
617ba13b | 2988 | int err = init_ext4_xattr(); |
ac27a0ec DK |
2989 | if (err) |
2990 | return err; | |
2991 | err = init_inodecache(); | |
2992 | if (err) | |
2993 | goto out1; | |
63f57933 | 2994 | err = register_filesystem(&ext4dev_fs_type); |
ac27a0ec DK |
2995 | if (err) |
2996 | goto out; | |
2997 | return 0; | |
2998 | out: | |
2999 | destroy_inodecache(); | |
3000 | out1: | |
617ba13b | 3001 | exit_ext4_xattr(); |
ac27a0ec DK |
3002 | return err; |
3003 | } | |
3004 | ||
617ba13b | 3005 | static void __exit exit_ext4_fs(void) |
ac27a0ec | 3006 | { |
617ba13b | 3007 | unregister_filesystem(&ext4dev_fs_type); |
ac27a0ec | 3008 | destroy_inodecache(); |
617ba13b | 3009 | exit_ext4_xattr(); |
ac27a0ec DK |
3010 | } |
3011 | ||
3012 | MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others"); | |
617ba13b | 3013 | MODULE_DESCRIPTION("Fourth Extended Filesystem with extents"); |
ac27a0ec | 3014 | MODULE_LICENSE("GPL"); |
617ba13b MC |
3015 | module_init(init_ext4_fs) |
3016 | module_exit(exit_ext4_fs) |