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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> |
717d50e4 | 40 | #include <linux/crc16.h> |
ac27a0ec DK |
41 | |
42 | #include <asm/uaccess.h> | |
43 | ||
44 | #include "xattr.h" | |
45 | #include "acl.h" | |
46 | #include "namei.h" | |
717d50e4 | 47 | #include "group.h" |
ac27a0ec | 48 | |
617ba13b | 49 | static int ext4_load_journal(struct super_block *, struct ext4_super_block *, |
ac27a0ec | 50 | unsigned long journal_devnum); |
617ba13b | 51 | static int ext4_create_journal(struct super_block *, struct ext4_super_block *, |
ac27a0ec | 52 | unsigned int); |
617ba13b MC |
53 | static void ext4_commit_super (struct super_block * sb, |
54 | struct ext4_super_block * es, | |
ac27a0ec | 55 | int sync); |
617ba13b MC |
56 | static void ext4_mark_recovery_complete(struct super_block * sb, |
57 | struct ext4_super_block * es); | |
58 | static void ext4_clear_journal_err(struct super_block * sb, | |
59 | struct ext4_super_block * es); | |
60 | static int ext4_sync_fs(struct super_block *sb, int wait); | |
61 | static const char *ext4_decode_error(struct super_block * sb, int errno, | |
ac27a0ec | 62 | char nbuf[16]); |
617ba13b MC |
63 | static int ext4_remount (struct super_block * sb, int * flags, char * data); |
64 | static int ext4_statfs (struct dentry * dentry, struct kstatfs * buf); | |
65 | static void ext4_unlockfs(struct super_block *sb); | |
66 | static void ext4_write_super (struct super_block * sb); | |
67 | static void ext4_write_super_lockfs(struct super_block *sb); | |
ac27a0ec | 68 | |
bd81d8ee | 69 | |
8fadc143 AR |
70 | ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, |
71 | struct ext4_group_desc *bg) | |
bd81d8ee | 72 | { |
3a14589c | 73 | return le32_to_cpu(bg->bg_block_bitmap_lo) | |
8fadc143 | 74 | (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? |
3a14589c | 75 | (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0); |
bd81d8ee LV |
76 | } |
77 | ||
8fadc143 AR |
78 | ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, |
79 | struct ext4_group_desc *bg) | |
bd81d8ee | 80 | { |
5272f837 | 81 | return le32_to_cpu(bg->bg_inode_bitmap_lo) | |
8fadc143 | 82 | (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? |
5272f837 | 83 | (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0); |
bd81d8ee LV |
84 | } |
85 | ||
8fadc143 AR |
86 | ext4_fsblk_t ext4_inode_table(struct super_block *sb, |
87 | struct ext4_group_desc *bg) | |
bd81d8ee | 88 | { |
5272f837 | 89 | return le32_to_cpu(bg->bg_inode_table_lo) | |
8fadc143 | 90 | (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? |
5272f837 | 91 | (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0); |
bd81d8ee LV |
92 | } |
93 | ||
8fadc143 AR |
94 | void ext4_block_bitmap_set(struct super_block *sb, |
95 | struct ext4_group_desc *bg, ext4_fsblk_t blk) | |
bd81d8ee | 96 | { |
3a14589c | 97 | bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk); |
8fadc143 AR |
98 | if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) |
99 | bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32); | |
bd81d8ee LV |
100 | } |
101 | ||
8fadc143 AR |
102 | void ext4_inode_bitmap_set(struct super_block *sb, |
103 | struct ext4_group_desc *bg, ext4_fsblk_t blk) | |
bd81d8ee | 104 | { |
5272f837 | 105 | bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk); |
8fadc143 AR |
106 | if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) |
107 | bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32); | |
bd81d8ee LV |
108 | } |
109 | ||
8fadc143 AR |
110 | void ext4_inode_table_set(struct super_block *sb, |
111 | struct ext4_group_desc *bg, ext4_fsblk_t blk) | |
bd81d8ee | 112 | { |
5272f837 | 113 | bg->bg_inode_table_lo = cpu_to_le32((u32)blk); |
8fadc143 AR |
114 | if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) |
115 | bg->bg_inode_table_hi = cpu_to_le32(blk >> 32); | |
bd81d8ee LV |
116 | } |
117 | ||
ac27a0ec | 118 | /* |
dab291af | 119 | * Wrappers for jbd2_journal_start/end. |
ac27a0ec DK |
120 | * |
121 | * The only special thing we need to do here is to make sure that all | |
122 | * journal_end calls result in the superblock being marked dirty, so | |
123 | * that sync() will call the filesystem's write_super callback if | |
124 | * appropriate. | |
125 | */ | |
617ba13b | 126 | handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks) |
ac27a0ec DK |
127 | { |
128 | journal_t *journal; | |
129 | ||
130 | if (sb->s_flags & MS_RDONLY) | |
131 | return ERR_PTR(-EROFS); | |
132 | ||
133 | /* Special case here: if the journal has aborted behind our | |
134 | * backs (eg. EIO in the commit thread), then we still need to | |
135 | * take the FS itself readonly cleanly. */ | |
617ba13b | 136 | journal = EXT4_SB(sb)->s_journal; |
ac27a0ec | 137 | if (is_journal_aborted(journal)) { |
617ba13b | 138 | ext4_abort(sb, __FUNCTION__, |
ac27a0ec DK |
139 | "Detected aborted journal"); |
140 | return ERR_PTR(-EROFS); | |
141 | } | |
142 | ||
dab291af | 143 | return jbd2_journal_start(journal, nblocks); |
ac27a0ec DK |
144 | } |
145 | ||
146 | /* | |
147 | * The only special thing we need to do here is to make sure that all | |
dab291af | 148 | * jbd2_journal_stop calls result in the superblock being marked dirty, so |
ac27a0ec DK |
149 | * that sync() will call the filesystem's write_super callback if |
150 | * appropriate. | |
151 | */ | |
617ba13b | 152 | int __ext4_journal_stop(const char *where, handle_t *handle) |
ac27a0ec DK |
153 | { |
154 | struct super_block *sb; | |
155 | int err; | |
156 | int rc; | |
157 | ||
158 | sb = handle->h_transaction->t_journal->j_private; | |
159 | err = handle->h_err; | |
dab291af | 160 | rc = jbd2_journal_stop(handle); |
ac27a0ec DK |
161 | |
162 | if (!err) | |
163 | err = rc; | |
164 | if (err) | |
617ba13b | 165 | __ext4_std_error(sb, where, err); |
ac27a0ec DK |
166 | return err; |
167 | } | |
168 | ||
617ba13b | 169 | void ext4_journal_abort_handle(const char *caller, const char *err_fn, |
ac27a0ec DK |
170 | struct buffer_head *bh, handle_t *handle, int err) |
171 | { | |
172 | char nbuf[16]; | |
617ba13b | 173 | const char *errstr = ext4_decode_error(NULL, err, nbuf); |
ac27a0ec DK |
174 | |
175 | if (bh) | |
176 | BUFFER_TRACE(bh, "abort"); | |
177 | ||
178 | if (!handle->h_err) | |
179 | handle->h_err = err; | |
180 | ||
181 | if (is_handle_aborted(handle)) | |
182 | return; | |
183 | ||
184 | printk(KERN_ERR "%s: aborting transaction: %s in %s\n", | |
185 | caller, errstr, err_fn); | |
186 | ||
dab291af | 187 | jbd2_journal_abort_handle(handle); |
ac27a0ec DK |
188 | } |
189 | ||
190 | /* Deal with the reporting of failure conditions on a filesystem such as | |
191 | * inconsistencies detected or read IO failures. | |
192 | * | |
193 | * On ext2, we can store the error state of the filesystem in the | |
617ba13b | 194 | * superblock. That is not possible on ext4, because we may have other |
ac27a0ec DK |
195 | * write ordering constraints on the superblock which prevent us from |
196 | * writing it out straight away; and given that the journal is about to | |
197 | * be aborted, we can't rely on the current, or future, transactions to | |
198 | * write out the superblock safely. | |
199 | * | |
dab291af | 200 | * We'll just use the jbd2_journal_abort() error code to record an error in |
ac27a0ec DK |
201 | * the journal instead. On recovery, the journal will compain about |
202 | * that error until we've noted it down and cleared it. | |
203 | */ | |
204 | ||
617ba13b | 205 | static void ext4_handle_error(struct super_block *sb) |
ac27a0ec | 206 | { |
617ba13b | 207 | struct ext4_super_block *es = EXT4_SB(sb)->s_es; |
ac27a0ec | 208 | |
617ba13b MC |
209 | EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; |
210 | es->s_state |= cpu_to_le16(EXT4_ERROR_FS); | |
ac27a0ec DK |
211 | |
212 | if (sb->s_flags & MS_RDONLY) | |
213 | return; | |
214 | ||
215 | if (!test_opt (sb, ERRORS_CONT)) { | |
617ba13b | 216 | journal_t *journal = EXT4_SB(sb)->s_journal; |
ac27a0ec | 217 | |
617ba13b | 218 | EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT; |
ac27a0ec | 219 | if (journal) |
dab291af | 220 | jbd2_journal_abort(journal, -EIO); |
ac27a0ec DK |
221 | } |
222 | if (test_opt (sb, ERRORS_RO)) { | |
223 | printk (KERN_CRIT "Remounting filesystem read-only\n"); | |
224 | sb->s_flags |= MS_RDONLY; | |
225 | } | |
617ba13b | 226 | ext4_commit_super(sb, es, 1); |
ac27a0ec | 227 | if (test_opt(sb, ERRORS_PANIC)) |
617ba13b | 228 | panic("EXT4-fs (device %s): panic forced after error\n", |
ac27a0ec DK |
229 | sb->s_id); |
230 | } | |
231 | ||
617ba13b | 232 | void ext4_error (struct super_block * sb, const char * function, |
ac27a0ec DK |
233 | const char * fmt, ...) |
234 | { | |
235 | va_list args; | |
236 | ||
237 | va_start(args, fmt); | |
617ba13b | 238 | printk(KERN_CRIT "EXT4-fs error (device %s): %s: ",sb->s_id, function); |
ac27a0ec DK |
239 | vprintk(fmt, args); |
240 | printk("\n"); | |
241 | va_end(args); | |
242 | ||
617ba13b | 243 | ext4_handle_error(sb); |
ac27a0ec DK |
244 | } |
245 | ||
617ba13b | 246 | static const char *ext4_decode_error(struct super_block * sb, int errno, |
ac27a0ec DK |
247 | char nbuf[16]) |
248 | { | |
249 | char *errstr = NULL; | |
250 | ||
251 | switch (errno) { | |
252 | case -EIO: | |
253 | errstr = "IO failure"; | |
254 | break; | |
255 | case -ENOMEM: | |
256 | errstr = "Out of memory"; | |
257 | break; | |
258 | case -EROFS: | |
dab291af | 259 | if (!sb || EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT) |
ac27a0ec DK |
260 | errstr = "Journal has aborted"; |
261 | else | |
262 | errstr = "Readonly filesystem"; | |
263 | break; | |
264 | default: | |
265 | /* If the caller passed in an extra buffer for unknown | |
266 | * errors, textualise them now. Else we just return | |
267 | * NULL. */ | |
268 | if (nbuf) { | |
269 | /* Check for truncated error codes... */ | |
270 | if (snprintf(nbuf, 16, "error %d", -errno) >= 0) | |
271 | errstr = nbuf; | |
272 | } | |
273 | break; | |
274 | } | |
275 | ||
276 | return errstr; | |
277 | } | |
278 | ||
617ba13b | 279 | /* __ext4_std_error decodes expected errors from journaling functions |
ac27a0ec DK |
280 | * automatically and invokes the appropriate error response. */ |
281 | ||
617ba13b | 282 | void __ext4_std_error (struct super_block * sb, const char * function, |
ac27a0ec DK |
283 | int errno) |
284 | { | |
285 | char nbuf[16]; | |
286 | const char *errstr; | |
287 | ||
288 | /* Special case: if the error is EROFS, and we're not already | |
289 | * inside a transaction, then there's really no point in logging | |
290 | * an error. */ | |
291 | if (errno == -EROFS && journal_current_handle() == NULL && | |
292 | (sb->s_flags & MS_RDONLY)) | |
293 | return; | |
294 | ||
617ba13b MC |
295 | errstr = ext4_decode_error(sb, errno, nbuf); |
296 | printk (KERN_CRIT "EXT4-fs error (device %s) in %s: %s\n", | |
ac27a0ec DK |
297 | sb->s_id, function, errstr); |
298 | ||
617ba13b | 299 | ext4_handle_error(sb); |
ac27a0ec DK |
300 | } |
301 | ||
302 | /* | |
617ba13b | 303 | * ext4_abort is a much stronger failure handler than ext4_error. The |
ac27a0ec DK |
304 | * abort function may be used to deal with unrecoverable failures such |
305 | * as journal IO errors or ENOMEM at a critical moment in log management. | |
306 | * | |
307 | * We unconditionally force the filesystem into an ABORT|READONLY state, | |
308 | * unless the error response on the fs has been set to panic in which | |
309 | * case we take the easy way out and panic immediately. | |
310 | */ | |
311 | ||
617ba13b | 312 | void ext4_abort (struct super_block * sb, const char * function, |
ac27a0ec DK |
313 | const char * fmt, ...) |
314 | { | |
315 | va_list args; | |
316 | ||
617ba13b | 317 | printk (KERN_CRIT "ext4_abort called.\n"); |
ac27a0ec DK |
318 | |
319 | va_start(args, fmt); | |
617ba13b | 320 | printk(KERN_CRIT "EXT4-fs error (device %s): %s: ",sb->s_id, function); |
ac27a0ec DK |
321 | vprintk(fmt, args); |
322 | printk("\n"); | |
323 | va_end(args); | |
324 | ||
325 | if (test_opt(sb, ERRORS_PANIC)) | |
617ba13b | 326 | panic("EXT4-fs panic from previous error\n"); |
ac27a0ec DK |
327 | |
328 | if (sb->s_flags & MS_RDONLY) | |
329 | return; | |
330 | ||
331 | printk(KERN_CRIT "Remounting filesystem read-only\n"); | |
617ba13b | 332 | EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; |
ac27a0ec | 333 | sb->s_flags |= MS_RDONLY; |
617ba13b | 334 | EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT; |
dab291af | 335 | jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO); |
ac27a0ec DK |
336 | } |
337 | ||
617ba13b | 338 | void ext4_warning (struct super_block * sb, const char * function, |
ac27a0ec DK |
339 | const char * fmt, ...) |
340 | { | |
341 | va_list args; | |
342 | ||
343 | va_start(args, fmt); | |
617ba13b | 344 | printk(KERN_WARNING "EXT4-fs warning (device %s): %s: ", |
ac27a0ec DK |
345 | sb->s_id, function); |
346 | vprintk(fmt, args); | |
347 | printk("\n"); | |
348 | va_end(args); | |
349 | } | |
350 | ||
617ba13b | 351 | void ext4_update_dynamic_rev(struct super_block *sb) |
ac27a0ec | 352 | { |
617ba13b | 353 | struct ext4_super_block *es = EXT4_SB(sb)->s_es; |
ac27a0ec | 354 | |
617ba13b | 355 | if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV) |
ac27a0ec DK |
356 | return; |
357 | ||
617ba13b | 358 | ext4_warning(sb, __FUNCTION__, |
ac27a0ec DK |
359 | "updating to rev %d because of new feature flag, " |
360 | "running e2fsck is recommended", | |
617ba13b | 361 | EXT4_DYNAMIC_REV); |
ac27a0ec | 362 | |
617ba13b MC |
363 | es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO); |
364 | es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE); | |
365 | es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV); | |
ac27a0ec DK |
366 | /* leave es->s_feature_*compat flags alone */ |
367 | /* es->s_uuid will be set by e2fsck if empty */ | |
368 | ||
369 | /* | |
370 | * The rest of the superblock fields should be zero, and if not it | |
371 | * means they are likely already in use, so leave them alone. We | |
372 | * can leave it up to e2fsck to clean up any inconsistencies there. | |
373 | */ | |
374 | } | |
375 | ||
376 | /* | |
377 | * Open the external journal device | |
378 | */ | |
617ba13b | 379 | static struct block_device *ext4_blkdev_get(dev_t dev) |
ac27a0ec DK |
380 | { |
381 | struct block_device *bdev; | |
382 | char b[BDEVNAME_SIZE]; | |
383 | ||
384 | bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE); | |
385 | if (IS_ERR(bdev)) | |
386 | goto fail; | |
387 | return bdev; | |
388 | ||
389 | fail: | |
617ba13b | 390 | printk(KERN_ERR "EXT4: failed to open journal device %s: %ld\n", |
ac27a0ec DK |
391 | __bdevname(dev, b), PTR_ERR(bdev)); |
392 | return NULL; | |
393 | } | |
394 | ||
395 | /* | |
396 | * Release the journal device | |
397 | */ | |
617ba13b | 398 | static int ext4_blkdev_put(struct block_device *bdev) |
ac27a0ec DK |
399 | { |
400 | bd_release(bdev); | |
401 | return blkdev_put(bdev); | |
402 | } | |
403 | ||
617ba13b | 404 | static int ext4_blkdev_remove(struct ext4_sb_info *sbi) |
ac27a0ec DK |
405 | { |
406 | struct block_device *bdev; | |
407 | int ret = -ENODEV; | |
408 | ||
409 | bdev = sbi->journal_bdev; | |
410 | if (bdev) { | |
617ba13b | 411 | ret = ext4_blkdev_put(bdev); |
ac27a0ec DK |
412 | sbi->journal_bdev = NULL; |
413 | } | |
414 | return ret; | |
415 | } | |
416 | ||
417 | static inline struct inode *orphan_list_entry(struct list_head *l) | |
418 | { | |
617ba13b | 419 | return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode; |
ac27a0ec DK |
420 | } |
421 | ||
617ba13b | 422 | static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi) |
ac27a0ec DK |
423 | { |
424 | struct list_head *l; | |
425 | ||
426 | printk(KERN_ERR "sb orphan head is %d\n", | |
427 | le32_to_cpu(sbi->s_es->s_last_orphan)); | |
428 | ||
429 | printk(KERN_ERR "sb_info orphan list:\n"); | |
430 | list_for_each(l, &sbi->s_orphan) { | |
431 | struct inode *inode = orphan_list_entry(l); | |
432 | printk(KERN_ERR " " | |
433 | "inode %s:%lu at %p: mode %o, nlink %d, next %d\n", | |
434 | inode->i_sb->s_id, inode->i_ino, inode, | |
435 | inode->i_mode, inode->i_nlink, | |
436 | NEXT_ORPHAN(inode)); | |
437 | } | |
438 | } | |
439 | ||
617ba13b | 440 | static void ext4_put_super (struct super_block * sb) |
ac27a0ec | 441 | { |
617ba13b MC |
442 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
443 | struct ext4_super_block *es = sbi->s_es; | |
ac27a0ec DK |
444 | int i; |
445 | ||
a86c6181 | 446 | ext4_ext_release(sb); |
617ba13b | 447 | ext4_xattr_put_super(sb); |
dab291af | 448 | jbd2_journal_destroy(sbi->s_journal); |
ac27a0ec | 449 | if (!(sb->s_flags & MS_RDONLY)) { |
617ba13b | 450 | EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); |
ac27a0ec DK |
451 | es->s_state = cpu_to_le16(sbi->s_mount_state); |
452 | BUFFER_TRACE(sbi->s_sbh, "marking dirty"); | |
453 | mark_buffer_dirty(sbi->s_sbh); | |
617ba13b | 454 | ext4_commit_super(sb, es, 1); |
ac27a0ec DK |
455 | } |
456 | ||
457 | for (i = 0; i < sbi->s_gdb_count; i++) | |
458 | brelse(sbi->s_group_desc[i]); | |
459 | kfree(sbi->s_group_desc); | |
460 | percpu_counter_destroy(&sbi->s_freeblocks_counter); | |
461 | percpu_counter_destroy(&sbi->s_freeinodes_counter); | |
462 | percpu_counter_destroy(&sbi->s_dirs_counter); | |
463 | brelse(sbi->s_sbh); | |
464 | #ifdef CONFIG_QUOTA | |
465 | for (i = 0; i < MAXQUOTAS; i++) | |
466 | kfree(sbi->s_qf_names[i]); | |
467 | #endif | |
468 | ||
469 | /* Debugging code just in case the in-memory inode orphan list | |
470 | * isn't empty. The on-disk one can be non-empty if we've | |
471 | * detected an error and taken the fs readonly, but the | |
472 | * in-memory list had better be clean by this point. */ | |
473 | if (!list_empty(&sbi->s_orphan)) | |
474 | dump_orphan_list(sb, sbi); | |
475 | J_ASSERT(list_empty(&sbi->s_orphan)); | |
476 | ||
f98393a6 | 477 | invalidate_bdev(sb->s_bdev); |
ac27a0ec DK |
478 | if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) { |
479 | /* | |
480 | * Invalidate the journal device's buffers. We don't want them | |
481 | * floating about in memory - the physical journal device may | |
482 | * hotswapped, and it breaks the `ro-after' testing code. | |
483 | */ | |
484 | sync_blockdev(sbi->journal_bdev); | |
f98393a6 | 485 | invalidate_bdev(sbi->journal_bdev); |
617ba13b | 486 | ext4_blkdev_remove(sbi); |
ac27a0ec DK |
487 | } |
488 | sb->s_fs_info = NULL; | |
489 | kfree(sbi); | |
490 | return; | |
491 | } | |
492 | ||
e18b890b | 493 | static struct kmem_cache *ext4_inode_cachep; |
ac27a0ec DK |
494 | |
495 | /* | |
496 | * Called inside transaction, so use GFP_NOFS | |
497 | */ | |
617ba13b | 498 | static struct inode *ext4_alloc_inode(struct super_block *sb) |
ac27a0ec | 499 | { |
617ba13b | 500 | struct ext4_inode_info *ei; |
ac27a0ec | 501 | |
e6b4f8da | 502 | ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS); |
ac27a0ec DK |
503 | if (!ei) |
504 | return NULL; | |
617ba13b MC |
505 | #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL |
506 | ei->i_acl = EXT4_ACL_NOT_CACHED; | |
507 | ei->i_default_acl = EXT4_ACL_NOT_CACHED; | |
ac27a0ec DK |
508 | #endif |
509 | ei->i_block_alloc_info = NULL; | |
510 | ei->vfs_inode.i_version = 1; | |
a86c6181 | 511 | memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache)); |
ac27a0ec DK |
512 | return &ei->vfs_inode; |
513 | } | |
514 | ||
617ba13b | 515 | static void ext4_destroy_inode(struct inode *inode) |
ac27a0ec | 516 | { |
9f7dd93d VA |
517 | if (!list_empty(&(EXT4_I(inode)->i_orphan))) { |
518 | printk("EXT4 Inode %p: orphan list check failed!\n", | |
519 | EXT4_I(inode)); | |
520 | print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4, | |
521 | EXT4_I(inode), sizeof(struct ext4_inode_info), | |
522 | true); | |
523 | dump_stack(); | |
524 | } | |
617ba13b | 525 | kmem_cache_free(ext4_inode_cachep, EXT4_I(inode)); |
ac27a0ec DK |
526 | } |
527 | ||
4ba9b9d0 | 528 | static void init_once(struct kmem_cache *cachep, void *foo) |
ac27a0ec | 529 | { |
617ba13b | 530 | struct ext4_inode_info *ei = (struct ext4_inode_info *) foo; |
ac27a0ec | 531 | |
a35afb83 | 532 | INIT_LIST_HEAD(&ei->i_orphan); |
617ba13b | 533 | #ifdef CONFIG_EXT4DEV_FS_XATTR |
a35afb83 | 534 | init_rwsem(&ei->xattr_sem); |
ac27a0ec | 535 | #endif |
a35afb83 CL |
536 | mutex_init(&ei->truncate_mutex); |
537 | inode_init_once(&ei->vfs_inode); | |
ac27a0ec DK |
538 | } |
539 | ||
540 | static int init_inodecache(void) | |
541 | { | |
617ba13b MC |
542 | ext4_inode_cachep = kmem_cache_create("ext4_inode_cache", |
543 | sizeof(struct ext4_inode_info), | |
ac27a0ec DK |
544 | 0, (SLAB_RECLAIM_ACCOUNT| |
545 | SLAB_MEM_SPREAD), | |
20c2df83 | 546 | init_once); |
617ba13b | 547 | if (ext4_inode_cachep == NULL) |
ac27a0ec DK |
548 | return -ENOMEM; |
549 | return 0; | |
550 | } | |
551 | ||
552 | static void destroy_inodecache(void) | |
553 | { | |
617ba13b | 554 | kmem_cache_destroy(ext4_inode_cachep); |
ac27a0ec DK |
555 | } |
556 | ||
617ba13b | 557 | static void ext4_clear_inode(struct inode *inode) |
ac27a0ec | 558 | { |
617ba13b MC |
559 | struct ext4_block_alloc_info *rsv = EXT4_I(inode)->i_block_alloc_info; |
560 | #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL | |
561 | if (EXT4_I(inode)->i_acl && | |
562 | EXT4_I(inode)->i_acl != EXT4_ACL_NOT_CACHED) { | |
563 | posix_acl_release(EXT4_I(inode)->i_acl); | |
564 | EXT4_I(inode)->i_acl = EXT4_ACL_NOT_CACHED; | |
565 | } | |
566 | if (EXT4_I(inode)->i_default_acl && | |
567 | EXT4_I(inode)->i_default_acl != EXT4_ACL_NOT_CACHED) { | |
568 | posix_acl_release(EXT4_I(inode)->i_default_acl); | |
569 | EXT4_I(inode)->i_default_acl = EXT4_ACL_NOT_CACHED; | |
ac27a0ec DK |
570 | } |
571 | #endif | |
617ba13b MC |
572 | ext4_discard_reservation(inode); |
573 | EXT4_I(inode)->i_block_alloc_info = NULL; | |
ac27a0ec DK |
574 | if (unlikely(rsv)) |
575 | kfree(rsv); | |
576 | } | |
577 | ||
617ba13b | 578 | static inline void ext4_show_quota_options(struct seq_file *seq, struct super_block *sb) |
ac27a0ec DK |
579 | { |
580 | #if defined(CONFIG_QUOTA) | |
617ba13b | 581 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
ac27a0ec DK |
582 | |
583 | if (sbi->s_jquota_fmt) | |
584 | seq_printf(seq, ",jqfmt=%s", | |
585 | (sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold": "vfsv0"); | |
586 | ||
587 | if (sbi->s_qf_names[USRQUOTA]) | |
588 | seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]); | |
589 | ||
590 | if (sbi->s_qf_names[GRPQUOTA]) | |
591 | seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]); | |
592 | ||
617ba13b | 593 | if (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA) |
ac27a0ec DK |
594 | seq_puts(seq, ",usrquota"); |
595 | ||
617ba13b | 596 | if (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA) |
ac27a0ec DK |
597 | seq_puts(seq, ",grpquota"); |
598 | #endif | |
599 | } | |
600 | ||
d9c9bef1 MS |
601 | /* |
602 | * Show an option if | |
603 | * - it's set to a non-default value OR | |
604 | * - if the per-sb default is different from the global default | |
605 | */ | |
617ba13b | 606 | static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs) |
ac27a0ec DK |
607 | { |
608 | struct super_block *sb = vfs->mnt_sb; | |
d9c9bef1 MS |
609 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
610 | struct ext4_super_block *es = sbi->s_es; | |
611 | unsigned long def_mount_opts; | |
612 | ||
613 | def_mount_opts = le32_to_cpu(es->s_default_mount_opts); | |
614 | ||
615 | if (sbi->s_sb_block != 1) | |
616 | seq_printf(seq, ",sb=%llu", sbi->s_sb_block); | |
617 | if (test_opt(sb, MINIX_DF)) | |
618 | seq_puts(seq, ",minixdf"); | |
619 | if (test_opt(sb, GRPID)) | |
620 | seq_puts(seq, ",grpid"); | |
621 | if (!test_opt(sb, GRPID) && (def_mount_opts & EXT4_DEFM_BSDGROUPS)) | |
622 | seq_puts(seq, ",nogrpid"); | |
623 | if (sbi->s_resuid != EXT4_DEF_RESUID || | |
624 | le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID) { | |
625 | seq_printf(seq, ",resuid=%u", sbi->s_resuid); | |
626 | } | |
627 | if (sbi->s_resgid != EXT4_DEF_RESGID || | |
628 | le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID) { | |
629 | seq_printf(seq, ",resgid=%u", sbi->s_resgid); | |
630 | } | |
631 | if (test_opt(sb, ERRORS_CONT)) { | |
632 | int def_errors = le16_to_cpu(es->s_errors); | |
633 | ||
634 | if (def_errors == EXT4_ERRORS_PANIC || | |
635 | def_errors == EXT4_ERRORS_RO) { | |
636 | seq_puts(seq, ",errors=continue"); | |
637 | } | |
638 | } | |
639 | if (test_opt(sb, ERRORS_RO)) | |
640 | seq_puts(seq, ",errors=remount-ro"); | |
641 | if (test_opt(sb, ERRORS_PANIC)) | |
642 | seq_puts(seq, ",errors=panic"); | |
643 | if (test_opt(sb, NO_UID32)) | |
644 | seq_puts(seq, ",nouid32"); | |
645 | if (test_opt(sb, DEBUG)) | |
646 | seq_puts(seq, ",debug"); | |
647 | if (test_opt(sb, OLDALLOC)) | |
648 | seq_puts(seq, ",oldalloc"); | |
649 | #ifdef CONFIG_EXT4_FS_XATTR | |
650 | if (test_opt(sb, XATTR_USER)) | |
651 | seq_puts(seq, ",user_xattr"); | |
652 | if (!test_opt(sb, XATTR_USER) && | |
653 | (def_mount_opts & EXT4_DEFM_XATTR_USER)) { | |
654 | seq_puts(seq, ",nouser_xattr"); | |
655 | } | |
656 | #endif | |
657 | #ifdef CONFIG_EXT4_FS_POSIX_ACL | |
658 | if (test_opt(sb, POSIX_ACL)) | |
659 | seq_puts(seq, ",acl"); | |
660 | if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT4_DEFM_ACL)) | |
661 | seq_puts(seq, ",noacl"); | |
662 | #endif | |
663 | if (!test_opt(sb, RESERVATION)) | |
664 | seq_puts(seq, ",noreservation"); | |
665 | if (sbi->s_commit_interval) { | |
666 | seq_printf(seq, ",commit=%u", | |
667 | (unsigned) (sbi->s_commit_interval / HZ)); | |
668 | } | |
669 | if (test_opt(sb, BARRIER)) | |
670 | seq_puts(seq, ",barrier=1"); | |
671 | if (test_opt(sb, NOBH)) | |
672 | seq_puts(seq, ",nobh"); | |
673 | if (!test_opt(sb, EXTENTS)) | |
674 | seq_puts(seq, ",noextents"); | |
ac27a0ec | 675 | |
617ba13b | 676 | if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) |
ac27a0ec | 677 | seq_puts(seq, ",data=journal"); |
617ba13b | 678 | else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) |
ac27a0ec | 679 | seq_puts(seq, ",data=ordered"); |
617ba13b | 680 | else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA) |
ac27a0ec DK |
681 | seq_puts(seq, ",data=writeback"); |
682 | ||
617ba13b | 683 | ext4_show_quota_options(seq, sb); |
ac27a0ec DK |
684 | |
685 | return 0; | |
686 | } | |
687 | ||
688 | ||
1b961ac0 CH |
689 | static struct inode *ext4_nfs_get_inode(struct super_block *sb, |
690 | u64 ino, u32 generation) | |
ac27a0ec | 691 | { |
ac27a0ec | 692 | struct inode *inode; |
ac27a0ec | 693 | |
617ba13b | 694 | if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO) |
ac27a0ec | 695 | return ERR_PTR(-ESTALE); |
617ba13b | 696 | if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)) |
ac27a0ec DK |
697 | return ERR_PTR(-ESTALE); |
698 | ||
699 | /* iget isn't really right if the inode is currently unallocated!! | |
700 | * | |
617ba13b | 701 | * ext4_read_inode will return a bad_inode if the inode had been |
ac27a0ec DK |
702 | * deleted, so we should be safe. |
703 | * | |
704 | * Currently we don't know the generation for parent directory, so | |
705 | * a generation of 0 means "accept any" | |
706 | */ | |
707 | inode = iget(sb, ino); | |
708 | if (inode == NULL) | |
709 | return ERR_PTR(-ENOMEM); | |
710 | if (is_bad_inode(inode) || | |
711 | (generation && inode->i_generation != generation)) { | |
712 | iput(inode); | |
713 | return ERR_PTR(-ESTALE); | |
714 | } | |
1b961ac0 CH |
715 | |
716 | return inode; | |
717 | } | |
718 | ||
719 | static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid, | |
720 | int fh_len, int fh_type) | |
721 | { | |
722 | return generic_fh_to_dentry(sb, fid, fh_len, fh_type, | |
723 | ext4_nfs_get_inode); | |
724 | } | |
725 | ||
726 | static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid, | |
727 | int fh_len, int fh_type) | |
728 | { | |
729 | return generic_fh_to_parent(sb, fid, fh_len, fh_type, | |
730 | ext4_nfs_get_inode); | |
ac27a0ec DK |
731 | } |
732 | ||
733 | #ifdef CONFIG_QUOTA | |
734 | #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group") | |
735 | #define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA)) | |
736 | ||
617ba13b MC |
737 | static int ext4_dquot_initialize(struct inode *inode, int type); |
738 | static int ext4_dquot_drop(struct inode *inode); | |
739 | static int ext4_write_dquot(struct dquot *dquot); | |
740 | static int ext4_acquire_dquot(struct dquot *dquot); | |
741 | static int ext4_release_dquot(struct dquot *dquot); | |
742 | static int ext4_mark_dquot_dirty(struct dquot *dquot); | |
743 | static int ext4_write_info(struct super_block *sb, int type); | |
744 | static int ext4_quota_on(struct super_block *sb, int type, int format_id, char *path); | |
745 | static int ext4_quota_on_mount(struct super_block *sb, int type); | |
746 | static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data, | |
ac27a0ec | 747 | size_t len, loff_t off); |
617ba13b | 748 | static ssize_t ext4_quota_write(struct super_block *sb, int type, |
ac27a0ec DK |
749 | const char *data, size_t len, loff_t off); |
750 | ||
617ba13b MC |
751 | static struct dquot_operations ext4_quota_operations = { |
752 | .initialize = ext4_dquot_initialize, | |
753 | .drop = ext4_dquot_drop, | |
ac27a0ec DK |
754 | .alloc_space = dquot_alloc_space, |
755 | .alloc_inode = dquot_alloc_inode, | |
756 | .free_space = dquot_free_space, | |
757 | .free_inode = dquot_free_inode, | |
758 | .transfer = dquot_transfer, | |
617ba13b MC |
759 | .write_dquot = ext4_write_dquot, |
760 | .acquire_dquot = ext4_acquire_dquot, | |
761 | .release_dquot = ext4_release_dquot, | |
762 | .mark_dirty = ext4_mark_dquot_dirty, | |
763 | .write_info = ext4_write_info | |
ac27a0ec DK |
764 | }; |
765 | ||
617ba13b MC |
766 | static struct quotactl_ops ext4_qctl_operations = { |
767 | .quota_on = ext4_quota_on, | |
ac27a0ec DK |
768 | .quota_off = vfs_quota_off, |
769 | .quota_sync = vfs_quota_sync, | |
770 | .get_info = vfs_get_dqinfo, | |
771 | .set_info = vfs_set_dqinfo, | |
772 | .get_dqblk = vfs_get_dqblk, | |
773 | .set_dqblk = vfs_set_dqblk | |
774 | }; | |
775 | #endif | |
776 | ||
ee9b6d61 | 777 | static const struct super_operations ext4_sops = { |
617ba13b MC |
778 | .alloc_inode = ext4_alloc_inode, |
779 | .destroy_inode = ext4_destroy_inode, | |
780 | .read_inode = ext4_read_inode, | |
781 | .write_inode = ext4_write_inode, | |
782 | .dirty_inode = ext4_dirty_inode, | |
783 | .delete_inode = ext4_delete_inode, | |
784 | .put_super = ext4_put_super, | |
785 | .write_super = ext4_write_super, | |
786 | .sync_fs = ext4_sync_fs, | |
787 | .write_super_lockfs = ext4_write_super_lockfs, | |
788 | .unlockfs = ext4_unlockfs, | |
789 | .statfs = ext4_statfs, | |
790 | .remount_fs = ext4_remount, | |
791 | .clear_inode = ext4_clear_inode, | |
792 | .show_options = ext4_show_options, | |
ac27a0ec | 793 | #ifdef CONFIG_QUOTA |
617ba13b MC |
794 | .quota_read = ext4_quota_read, |
795 | .quota_write = ext4_quota_write, | |
ac27a0ec DK |
796 | #endif |
797 | }; | |
798 | ||
39655164 | 799 | static const struct export_operations ext4_export_ops = { |
1b961ac0 CH |
800 | .fh_to_dentry = ext4_fh_to_dentry, |
801 | .fh_to_parent = ext4_fh_to_parent, | |
617ba13b | 802 | .get_parent = ext4_get_parent, |
ac27a0ec DK |
803 | }; |
804 | ||
805 | enum { | |
806 | Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid, | |
807 | Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro, | |
808 | Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov, | |
809 | Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl, | |
810 | Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh, | |
811 | Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev, | |
812 | Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback, | |
813 | Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota, | |
814 | Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota, | |
815 | Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota, | |
1e2462f9 | 816 | Opt_grpquota, Opt_extents, Opt_noextents, |
ac27a0ec DK |
817 | }; |
818 | ||
819 | static match_table_t tokens = { | |
820 | {Opt_bsd_df, "bsddf"}, | |
821 | {Opt_minix_df, "minixdf"}, | |
822 | {Opt_grpid, "grpid"}, | |
823 | {Opt_grpid, "bsdgroups"}, | |
824 | {Opt_nogrpid, "nogrpid"}, | |
825 | {Opt_nogrpid, "sysvgroups"}, | |
826 | {Opt_resgid, "resgid=%u"}, | |
827 | {Opt_resuid, "resuid=%u"}, | |
828 | {Opt_sb, "sb=%u"}, | |
829 | {Opt_err_cont, "errors=continue"}, | |
830 | {Opt_err_panic, "errors=panic"}, | |
831 | {Opt_err_ro, "errors=remount-ro"}, | |
832 | {Opt_nouid32, "nouid32"}, | |
833 | {Opt_nocheck, "nocheck"}, | |
834 | {Opt_nocheck, "check=none"}, | |
835 | {Opt_debug, "debug"}, | |
836 | {Opt_oldalloc, "oldalloc"}, | |
837 | {Opt_orlov, "orlov"}, | |
838 | {Opt_user_xattr, "user_xattr"}, | |
839 | {Opt_nouser_xattr, "nouser_xattr"}, | |
840 | {Opt_acl, "acl"}, | |
841 | {Opt_noacl, "noacl"}, | |
842 | {Opt_reservation, "reservation"}, | |
843 | {Opt_noreservation, "noreservation"}, | |
844 | {Opt_noload, "noload"}, | |
845 | {Opt_nobh, "nobh"}, | |
846 | {Opt_bh, "bh"}, | |
847 | {Opt_commit, "commit=%u"}, | |
848 | {Opt_journal_update, "journal=update"}, | |
849 | {Opt_journal_inum, "journal=%u"}, | |
850 | {Opt_journal_dev, "journal_dev=%u"}, | |
851 | {Opt_abort, "abort"}, | |
852 | {Opt_data_journal, "data=journal"}, | |
853 | {Opt_data_ordered, "data=ordered"}, | |
854 | {Opt_data_writeback, "data=writeback"}, | |
855 | {Opt_offusrjquota, "usrjquota="}, | |
856 | {Opt_usrjquota, "usrjquota=%s"}, | |
857 | {Opt_offgrpjquota, "grpjquota="}, | |
858 | {Opt_grpjquota, "grpjquota=%s"}, | |
859 | {Opt_jqfmt_vfsold, "jqfmt=vfsold"}, | |
860 | {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"}, | |
861 | {Opt_grpquota, "grpquota"}, | |
862 | {Opt_noquota, "noquota"}, | |
863 | {Opt_quota, "quota"}, | |
864 | {Opt_usrquota, "usrquota"}, | |
865 | {Opt_barrier, "barrier=%u"}, | |
a86c6181 | 866 | {Opt_extents, "extents"}, |
1e2462f9 | 867 | {Opt_noextents, "noextents"}, |
ac27a0ec DK |
868 | {Opt_err, NULL}, |
869 | {Opt_resize, "resize"}, | |
870 | }; | |
871 | ||
617ba13b | 872 | static ext4_fsblk_t get_sb_block(void **data) |
ac27a0ec | 873 | { |
617ba13b | 874 | ext4_fsblk_t sb_block; |
ac27a0ec DK |
875 | char *options = (char *) *data; |
876 | ||
877 | if (!options || strncmp(options, "sb=", 3) != 0) | |
878 | return 1; /* Default location */ | |
879 | options += 3; | |
617ba13b | 880 | /*todo: use simple_strtoll with >32bit ext4 */ |
ac27a0ec DK |
881 | sb_block = simple_strtoul(options, &options, 0); |
882 | if (*options && *options != ',') { | |
617ba13b | 883 | printk("EXT4-fs: Invalid sb specification: %s\n", |
ac27a0ec DK |
884 | (char *) *data); |
885 | return 1; | |
886 | } | |
887 | if (*options == ',') | |
888 | options++; | |
889 | *data = (void *) options; | |
890 | return sb_block; | |
891 | } | |
892 | ||
893 | static int parse_options (char *options, struct super_block *sb, | |
894 | unsigned int *inum, unsigned long *journal_devnum, | |
617ba13b | 895 | ext4_fsblk_t *n_blocks_count, int is_remount) |
ac27a0ec | 896 | { |
617ba13b | 897 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
ac27a0ec DK |
898 | char * p; |
899 | substring_t args[MAX_OPT_ARGS]; | |
900 | int data_opt = 0; | |
901 | int option; | |
902 | #ifdef CONFIG_QUOTA | |
903 | int qtype; | |
904 | char *qname; | |
905 | #endif | |
906 | ||
907 | if (!options) | |
908 | return 1; | |
909 | ||
910 | while ((p = strsep (&options, ",")) != NULL) { | |
911 | int token; | |
912 | if (!*p) | |
913 | continue; | |
914 | ||
915 | token = match_token(p, tokens, args); | |
916 | switch (token) { | |
917 | case Opt_bsd_df: | |
918 | clear_opt (sbi->s_mount_opt, MINIX_DF); | |
919 | break; | |
920 | case Opt_minix_df: | |
921 | set_opt (sbi->s_mount_opt, MINIX_DF); | |
922 | break; | |
923 | case Opt_grpid: | |
924 | set_opt (sbi->s_mount_opt, GRPID); | |
925 | break; | |
926 | case Opt_nogrpid: | |
927 | clear_opt (sbi->s_mount_opt, GRPID); | |
928 | break; | |
929 | case Opt_resuid: | |
930 | if (match_int(&args[0], &option)) | |
931 | return 0; | |
932 | sbi->s_resuid = option; | |
933 | break; | |
934 | case Opt_resgid: | |
935 | if (match_int(&args[0], &option)) | |
936 | return 0; | |
937 | sbi->s_resgid = option; | |
938 | break; | |
939 | case Opt_sb: | |
940 | /* handled by get_sb_block() instead of here */ | |
941 | /* *sb_block = match_int(&args[0]); */ | |
942 | break; | |
943 | case Opt_err_panic: | |
944 | clear_opt (sbi->s_mount_opt, ERRORS_CONT); | |
945 | clear_opt (sbi->s_mount_opt, ERRORS_RO); | |
946 | set_opt (sbi->s_mount_opt, ERRORS_PANIC); | |
947 | break; | |
948 | case Opt_err_ro: | |
949 | clear_opt (sbi->s_mount_opt, ERRORS_CONT); | |
950 | clear_opt (sbi->s_mount_opt, ERRORS_PANIC); | |
951 | set_opt (sbi->s_mount_opt, ERRORS_RO); | |
952 | break; | |
953 | case Opt_err_cont: | |
954 | clear_opt (sbi->s_mount_opt, ERRORS_RO); | |
955 | clear_opt (sbi->s_mount_opt, ERRORS_PANIC); | |
956 | set_opt (sbi->s_mount_opt, ERRORS_CONT); | |
957 | break; | |
958 | case Opt_nouid32: | |
959 | set_opt (sbi->s_mount_opt, NO_UID32); | |
960 | break; | |
961 | case Opt_nocheck: | |
962 | clear_opt (sbi->s_mount_opt, CHECK); | |
963 | break; | |
964 | case Opt_debug: | |
965 | set_opt (sbi->s_mount_opt, DEBUG); | |
966 | break; | |
967 | case Opt_oldalloc: | |
968 | set_opt (sbi->s_mount_opt, OLDALLOC); | |
969 | break; | |
970 | case Opt_orlov: | |
971 | clear_opt (sbi->s_mount_opt, OLDALLOC); | |
972 | break; | |
617ba13b | 973 | #ifdef CONFIG_EXT4DEV_FS_XATTR |
ac27a0ec DK |
974 | case Opt_user_xattr: |
975 | set_opt (sbi->s_mount_opt, XATTR_USER); | |
976 | break; | |
977 | case Opt_nouser_xattr: | |
978 | clear_opt (sbi->s_mount_opt, XATTR_USER); | |
979 | break; | |
980 | #else | |
981 | case Opt_user_xattr: | |
982 | case Opt_nouser_xattr: | |
617ba13b | 983 | printk("EXT4 (no)user_xattr options not supported\n"); |
ac27a0ec DK |
984 | break; |
985 | #endif | |
617ba13b | 986 | #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL |
ac27a0ec DK |
987 | case Opt_acl: |
988 | set_opt(sbi->s_mount_opt, POSIX_ACL); | |
989 | break; | |
990 | case Opt_noacl: | |
991 | clear_opt(sbi->s_mount_opt, POSIX_ACL); | |
992 | break; | |
993 | #else | |
994 | case Opt_acl: | |
995 | case Opt_noacl: | |
617ba13b | 996 | printk("EXT4 (no)acl options not supported\n"); |
ac27a0ec DK |
997 | break; |
998 | #endif | |
999 | case Opt_reservation: | |
1000 | set_opt(sbi->s_mount_opt, RESERVATION); | |
1001 | break; | |
1002 | case Opt_noreservation: | |
1003 | clear_opt(sbi->s_mount_opt, RESERVATION); | |
1004 | break; | |
1005 | case Opt_journal_update: | |
1006 | /* @@@ FIXME */ | |
1007 | /* Eventually we will want to be able to create | |
1008 | a journal file here. For now, only allow the | |
1009 | user to specify an existing inode to be the | |
1010 | journal file. */ | |
1011 | if (is_remount) { | |
617ba13b | 1012 | printk(KERN_ERR "EXT4-fs: cannot specify " |
ac27a0ec DK |
1013 | "journal on remount\n"); |
1014 | return 0; | |
1015 | } | |
1016 | set_opt (sbi->s_mount_opt, UPDATE_JOURNAL); | |
1017 | break; | |
1018 | case Opt_journal_inum: | |
1019 | if (is_remount) { | |
617ba13b | 1020 | printk(KERN_ERR "EXT4-fs: cannot specify " |
ac27a0ec DK |
1021 | "journal on remount\n"); |
1022 | return 0; | |
1023 | } | |
1024 | if (match_int(&args[0], &option)) | |
1025 | return 0; | |
1026 | *inum = option; | |
1027 | break; | |
1028 | case Opt_journal_dev: | |
1029 | if (is_remount) { | |
617ba13b | 1030 | printk(KERN_ERR "EXT4-fs: cannot specify " |
ac27a0ec DK |
1031 | "journal on remount\n"); |
1032 | return 0; | |
1033 | } | |
1034 | if (match_int(&args[0], &option)) | |
1035 | return 0; | |
1036 | *journal_devnum = option; | |
1037 | break; | |
1038 | case Opt_noload: | |
1039 | set_opt (sbi->s_mount_opt, NOLOAD); | |
1040 | break; | |
1041 | case Opt_commit: | |
1042 | if (match_int(&args[0], &option)) | |
1043 | return 0; | |
1044 | if (option < 0) | |
1045 | return 0; | |
1046 | if (option == 0) | |
cd02ff0b | 1047 | option = JBD2_DEFAULT_MAX_COMMIT_AGE; |
ac27a0ec DK |
1048 | sbi->s_commit_interval = HZ * option; |
1049 | break; | |
1050 | case Opt_data_journal: | |
617ba13b | 1051 | data_opt = EXT4_MOUNT_JOURNAL_DATA; |
ac27a0ec DK |
1052 | goto datacheck; |
1053 | case Opt_data_ordered: | |
617ba13b | 1054 | data_opt = EXT4_MOUNT_ORDERED_DATA; |
ac27a0ec DK |
1055 | goto datacheck; |
1056 | case Opt_data_writeback: | |
617ba13b | 1057 | data_opt = EXT4_MOUNT_WRITEBACK_DATA; |
ac27a0ec DK |
1058 | datacheck: |
1059 | if (is_remount) { | |
617ba13b | 1060 | if ((sbi->s_mount_opt & EXT4_MOUNT_DATA_FLAGS) |
ac27a0ec DK |
1061 | != data_opt) { |
1062 | printk(KERN_ERR | |
617ba13b | 1063 | "EXT4-fs: cannot change data " |
ac27a0ec DK |
1064 | "mode on remount\n"); |
1065 | return 0; | |
1066 | } | |
1067 | } else { | |
617ba13b | 1068 | sbi->s_mount_opt &= ~EXT4_MOUNT_DATA_FLAGS; |
ac27a0ec DK |
1069 | sbi->s_mount_opt |= data_opt; |
1070 | } | |
1071 | break; | |
1072 | #ifdef CONFIG_QUOTA | |
1073 | case Opt_usrjquota: | |
1074 | qtype = USRQUOTA; | |
1075 | goto set_qf_name; | |
1076 | case Opt_grpjquota: | |
1077 | qtype = GRPQUOTA; | |
1078 | set_qf_name: | |
1079 | if (sb_any_quota_enabled(sb)) { | |
1080 | printk(KERN_ERR | |
617ba13b | 1081 | "EXT4-fs: Cannot change journalled " |
ac27a0ec DK |
1082 | "quota options when quota turned on.\n"); |
1083 | return 0; | |
1084 | } | |
1085 | qname = match_strdup(&args[0]); | |
1086 | if (!qname) { | |
1087 | printk(KERN_ERR | |
617ba13b | 1088 | "EXT4-fs: not enough memory for " |
ac27a0ec DK |
1089 | "storing quotafile name.\n"); |
1090 | return 0; | |
1091 | } | |
1092 | if (sbi->s_qf_names[qtype] && | |
1093 | strcmp(sbi->s_qf_names[qtype], qname)) { | |
1094 | printk(KERN_ERR | |
617ba13b | 1095 | "EXT4-fs: %s quota file already " |
ac27a0ec DK |
1096 | "specified.\n", QTYPE2NAME(qtype)); |
1097 | kfree(qname); | |
1098 | return 0; | |
1099 | } | |
1100 | sbi->s_qf_names[qtype] = qname; | |
1101 | if (strchr(sbi->s_qf_names[qtype], '/')) { | |
1102 | printk(KERN_ERR | |
617ba13b | 1103 | "EXT4-fs: quotafile must be on " |
ac27a0ec DK |
1104 | "filesystem root.\n"); |
1105 | kfree(sbi->s_qf_names[qtype]); | |
1106 | sbi->s_qf_names[qtype] = NULL; | |
1107 | return 0; | |
1108 | } | |
1109 | set_opt(sbi->s_mount_opt, QUOTA); | |
1110 | break; | |
1111 | case Opt_offusrjquota: | |
1112 | qtype = USRQUOTA; | |
1113 | goto clear_qf_name; | |
1114 | case Opt_offgrpjquota: | |
1115 | qtype = GRPQUOTA; | |
1116 | clear_qf_name: | |
1117 | if (sb_any_quota_enabled(sb)) { | |
617ba13b | 1118 | printk(KERN_ERR "EXT4-fs: Cannot change " |
ac27a0ec DK |
1119 | "journalled quota options when " |
1120 | "quota turned on.\n"); | |
1121 | return 0; | |
1122 | } | |
1123 | /* | |
1124 | * The space will be released later when all options | |
1125 | * are confirmed to be correct | |
1126 | */ | |
1127 | sbi->s_qf_names[qtype] = NULL; | |
1128 | break; | |
1129 | case Opt_jqfmt_vfsold: | |
1130 | sbi->s_jquota_fmt = QFMT_VFS_OLD; | |
1131 | break; | |
1132 | case Opt_jqfmt_vfsv0: | |
1133 | sbi->s_jquota_fmt = QFMT_VFS_V0; | |
1134 | break; | |
1135 | case Opt_quota: | |
1136 | case Opt_usrquota: | |
1137 | set_opt(sbi->s_mount_opt, QUOTA); | |
1138 | set_opt(sbi->s_mount_opt, USRQUOTA); | |
1139 | break; | |
1140 | case Opt_grpquota: | |
1141 | set_opt(sbi->s_mount_opt, QUOTA); | |
1142 | set_opt(sbi->s_mount_opt, GRPQUOTA); | |
1143 | break; | |
1144 | case Opt_noquota: | |
1145 | if (sb_any_quota_enabled(sb)) { | |
617ba13b | 1146 | printk(KERN_ERR "EXT4-fs: Cannot change quota " |
ac27a0ec DK |
1147 | "options when quota turned on.\n"); |
1148 | return 0; | |
1149 | } | |
1150 | clear_opt(sbi->s_mount_opt, QUOTA); | |
1151 | clear_opt(sbi->s_mount_opt, USRQUOTA); | |
1152 | clear_opt(sbi->s_mount_opt, GRPQUOTA); | |
1153 | break; | |
1154 | #else | |
1155 | case Opt_quota: | |
1156 | case Opt_usrquota: | |
1157 | case Opt_grpquota: | |
1158 | case Opt_usrjquota: | |
1159 | case Opt_grpjquota: | |
1160 | case Opt_offusrjquota: | |
1161 | case Opt_offgrpjquota: | |
1162 | case Opt_jqfmt_vfsold: | |
1163 | case Opt_jqfmt_vfsv0: | |
1164 | printk(KERN_ERR | |
617ba13b | 1165 | "EXT4-fs: journalled quota options not " |
ac27a0ec DK |
1166 | "supported.\n"); |
1167 | break; | |
1168 | case Opt_noquota: | |
1169 | break; | |
1170 | #endif | |
1171 | case Opt_abort: | |
1172 | set_opt(sbi->s_mount_opt, ABORT); | |
1173 | break; | |
1174 | case Opt_barrier: | |
1175 | if (match_int(&args[0], &option)) | |
1176 | return 0; | |
1177 | if (option) | |
1178 | set_opt(sbi->s_mount_opt, BARRIER); | |
1179 | else | |
1180 | clear_opt(sbi->s_mount_opt, BARRIER); | |
1181 | break; | |
1182 | case Opt_ignore: | |
1183 | break; | |
1184 | case Opt_resize: | |
1185 | if (!is_remount) { | |
617ba13b | 1186 | printk("EXT4-fs: resize option only available " |
ac27a0ec DK |
1187 | "for remount\n"); |
1188 | return 0; | |
1189 | } | |
1190 | if (match_int(&args[0], &option) != 0) | |
1191 | return 0; | |
1192 | *n_blocks_count = option; | |
1193 | break; | |
1194 | case Opt_nobh: | |
1195 | set_opt(sbi->s_mount_opt, NOBH); | |
1196 | break; | |
1197 | case Opt_bh: | |
1198 | clear_opt(sbi->s_mount_opt, NOBH); | |
1199 | break; | |
a86c6181 AT |
1200 | case Opt_extents: |
1201 | set_opt (sbi->s_mount_opt, EXTENTS); | |
1202 | break; | |
1e2462f9 MC |
1203 | case Opt_noextents: |
1204 | clear_opt (sbi->s_mount_opt, EXTENTS); | |
1205 | break; | |
ac27a0ec DK |
1206 | default: |
1207 | printk (KERN_ERR | |
617ba13b | 1208 | "EXT4-fs: Unrecognized mount option \"%s\" " |
ac27a0ec DK |
1209 | "or missing value\n", p); |
1210 | return 0; | |
1211 | } | |
1212 | } | |
1213 | #ifdef CONFIG_QUOTA | |
1214 | if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) { | |
617ba13b | 1215 | if ((sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA) && |
ac27a0ec DK |
1216 | sbi->s_qf_names[USRQUOTA]) |
1217 | clear_opt(sbi->s_mount_opt, USRQUOTA); | |
1218 | ||
617ba13b | 1219 | if ((sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA) && |
ac27a0ec DK |
1220 | sbi->s_qf_names[GRPQUOTA]) |
1221 | clear_opt(sbi->s_mount_opt, GRPQUOTA); | |
1222 | ||
1223 | if ((sbi->s_qf_names[USRQUOTA] && | |
617ba13b | 1224 | (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)) || |
ac27a0ec | 1225 | (sbi->s_qf_names[GRPQUOTA] && |
617ba13b MC |
1226 | (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA))) { |
1227 | printk(KERN_ERR "EXT4-fs: old and new quota " | |
ac27a0ec DK |
1228 | "format mixing.\n"); |
1229 | return 0; | |
1230 | } | |
1231 | ||
1232 | if (!sbi->s_jquota_fmt) { | |
617ba13b | 1233 | printk(KERN_ERR "EXT4-fs: journalled quota format " |
ac27a0ec DK |
1234 | "not specified.\n"); |
1235 | return 0; | |
1236 | } | |
1237 | } else { | |
1238 | if (sbi->s_jquota_fmt) { | |
617ba13b | 1239 | printk(KERN_ERR "EXT4-fs: journalled quota format " |
ac27a0ec DK |
1240 | "specified with no journalling " |
1241 | "enabled.\n"); | |
1242 | return 0; | |
1243 | } | |
1244 | } | |
1245 | #endif | |
1246 | return 1; | |
1247 | } | |
1248 | ||
617ba13b | 1249 | static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es, |
ac27a0ec DK |
1250 | int read_only) |
1251 | { | |
617ba13b | 1252 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
ac27a0ec DK |
1253 | int res = 0; |
1254 | ||
617ba13b MC |
1255 | if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) { |
1256 | printk (KERN_ERR "EXT4-fs warning: revision level too high, " | |
ac27a0ec DK |
1257 | "forcing read-only mode\n"); |
1258 | res = MS_RDONLY; | |
1259 | } | |
1260 | if (read_only) | |
1261 | return res; | |
617ba13b MC |
1262 | if (!(sbi->s_mount_state & EXT4_VALID_FS)) |
1263 | printk (KERN_WARNING "EXT4-fs warning: mounting unchecked fs, " | |
ac27a0ec | 1264 | "running e2fsck is recommended\n"); |
617ba13b | 1265 | else if ((sbi->s_mount_state & EXT4_ERROR_FS)) |
ac27a0ec | 1266 | printk (KERN_WARNING |
617ba13b | 1267 | "EXT4-fs warning: mounting fs with errors, " |
ac27a0ec DK |
1268 | "running e2fsck is recommended\n"); |
1269 | else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 && | |
1270 | le16_to_cpu(es->s_mnt_count) >= | |
1271 | (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count)) | |
1272 | printk (KERN_WARNING | |
617ba13b | 1273 | "EXT4-fs warning: maximal mount count reached, " |
ac27a0ec DK |
1274 | "running e2fsck is recommended\n"); |
1275 | else if (le32_to_cpu(es->s_checkinterval) && | |
1276 | (le32_to_cpu(es->s_lastcheck) + | |
1277 | le32_to_cpu(es->s_checkinterval) <= get_seconds())) | |
1278 | printk (KERN_WARNING | |
617ba13b | 1279 | "EXT4-fs warning: checktime reached, " |
ac27a0ec DK |
1280 | "running e2fsck is recommended\n"); |
1281 | #if 0 | |
1282 | /* @@@ We _will_ want to clear the valid bit if we find | |
63f57933 AM |
1283 | * inconsistencies, to force a fsck at reboot. But for |
1284 | * a plain journaled filesystem we can keep it set as | |
1285 | * valid forever! :) | |
1286 | */ | |
617ba13b | 1287 | es->s_state = cpu_to_le16(le16_to_cpu(es->s_state) & ~EXT4_VALID_FS); |
ac27a0ec DK |
1288 | #endif |
1289 | if (!(__s16) le16_to_cpu(es->s_max_mnt_count)) | |
617ba13b | 1290 | es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT); |
ac27a0ec DK |
1291 | es->s_mnt_count=cpu_to_le16(le16_to_cpu(es->s_mnt_count) + 1); |
1292 | es->s_mtime = cpu_to_le32(get_seconds()); | |
617ba13b MC |
1293 | ext4_update_dynamic_rev(sb); |
1294 | EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); | |
ac27a0ec | 1295 | |
617ba13b | 1296 | ext4_commit_super(sb, es, 1); |
ac27a0ec | 1297 | if (test_opt(sb, DEBUG)) |
617ba13b | 1298 | printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%lu, " |
ac27a0ec DK |
1299 | "bpg=%lu, ipg=%lu, mo=%04lx]\n", |
1300 | sb->s_blocksize, | |
1301 | sbi->s_groups_count, | |
617ba13b MC |
1302 | EXT4_BLOCKS_PER_GROUP(sb), |
1303 | EXT4_INODES_PER_GROUP(sb), | |
ac27a0ec DK |
1304 | sbi->s_mount_opt); |
1305 | ||
617ba13b MC |
1306 | printk(KERN_INFO "EXT4 FS on %s, ", sb->s_id); |
1307 | if (EXT4_SB(sb)->s_journal->j_inode == NULL) { | |
ac27a0ec DK |
1308 | char b[BDEVNAME_SIZE]; |
1309 | ||
1310 | printk("external journal on %s\n", | |
617ba13b | 1311 | bdevname(EXT4_SB(sb)->s_journal->j_dev, b)); |
ac27a0ec DK |
1312 | } else { |
1313 | printk("internal journal\n"); | |
1314 | } | |
1315 | return res; | |
1316 | } | |
1317 | ||
717d50e4 AD |
1318 | __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group, |
1319 | struct ext4_group_desc *gdp) | |
1320 | { | |
1321 | __u16 crc = 0; | |
1322 | ||
1323 | if (sbi->s_es->s_feature_ro_compat & | |
1324 | cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) { | |
1325 | int offset = offsetof(struct ext4_group_desc, bg_checksum); | |
1326 | __le32 le_group = cpu_to_le32(block_group); | |
1327 | ||
1328 | crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid)); | |
1329 | crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group)); | |
1330 | crc = crc16(crc, (__u8 *)gdp, offset); | |
1331 | offset += sizeof(gdp->bg_checksum); /* skip checksum */ | |
1332 | /* for checksum of struct ext4_group_desc do the rest...*/ | |
1333 | if ((sbi->s_es->s_feature_incompat & | |
1334 | cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) && | |
1335 | offset < le16_to_cpu(sbi->s_es->s_desc_size)) | |
1336 | crc = crc16(crc, (__u8 *)gdp + offset, | |
1337 | le16_to_cpu(sbi->s_es->s_desc_size) - | |
1338 | offset); | |
1339 | } | |
1340 | ||
1341 | return cpu_to_le16(crc); | |
1342 | } | |
1343 | ||
1344 | int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 block_group, | |
1345 | struct ext4_group_desc *gdp) | |
1346 | { | |
1347 | if ((sbi->s_es->s_feature_ro_compat & | |
1348 | cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) && | |
1349 | (gdp->bg_checksum != ext4_group_desc_csum(sbi, block_group, gdp))) | |
1350 | return 0; | |
1351 | ||
1352 | return 1; | |
1353 | } | |
1354 | ||
ac27a0ec | 1355 | /* Called at mount-time, super-block is locked */ |
617ba13b | 1356 | static int ext4_check_descriptors (struct super_block * sb) |
ac27a0ec | 1357 | { |
617ba13b MC |
1358 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
1359 | ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block); | |
1360 | ext4_fsblk_t last_block; | |
bd81d8ee LV |
1361 | ext4_fsblk_t block_bitmap; |
1362 | ext4_fsblk_t inode_bitmap; | |
1363 | ext4_fsblk_t inode_table; | |
617ba13b | 1364 | struct ext4_group_desc * gdp = NULL; |
ac27a0ec | 1365 | int desc_block = 0; |
ce421581 | 1366 | int flexbg_flag = 0; |
ac27a0ec DK |
1367 | int i; |
1368 | ||
ce421581 JS |
1369 | if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG)) |
1370 | flexbg_flag = 1; | |
1371 | ||
617ba13b | 1372 | ext4_debug ("Checking group descriptors"); |
ac27a0ec DK |
1373 | |
1374 | for (i = 0; i < sbi->s_groups_count; i++) | |
1375 | { | |
ce421581 | 1376 | if (i == sbi->s_groups_count - 1 || flexbg_flag) |
bd81d8ee | 1377 | last_block = ext4_blocks_count(sbi->s_es) - 1; |
ac27a0ec DK |
1378 | else |
1379 | last_block = first_block + | |
617ba13b | 1380 | (EXT4_BLOCKS_PER_GROUP(sb) - 1); |
ac27a0ec | 1381 | |
617ba13b MC |
1382 | if ((i % EXT4_DESC_PER_BLOCK(sb)) == 0) |
1383 | gdp = (struct ext4_group_desc *) | |
ac27a0ec | 1384 | sbi->s_group_desc[desc_block++]->b_data; |
8fadc143 | 1385 | block_bitmap = ext4_block_bitmap(sb, gdp); |
bd81d8ee | 1386 | if (block_bitmap < first_block || block_bitmap > last_block) |
ac27a0ec | 1387 | { |
617ba13b | 1388 | ext4_error (sb, "ext4_check_descriptors", |
ac27a0ec | 1389 | "Block bitmap for group %d" |
2ae02107 | 1390 | " not in group (block %llu)!", |
bd81d8ee | 1391 | i, block_bitmap); |
ac27a0ec DK |
1392 | return 0; |
1393 | } | |
8fadc143 | 1394 | inode_bitmap = ext4_inode_bitmap(sb, gdp); |
bd81d8ee | 1395 | if (inode_bitmap < first_block || inode_bitmap > last_block) |
ac27a0ec | 1396 | { |
617ba13b | 1397 | ext4_error (sb, "ext4_check_descriptors", |
ac27a0ec | 1398 | "Inode bitmap for group %d" |
2ae02107 | 1399 | " not in group (block %llu)!", |
bd81d8ee | 1400 | i, inode_bitmap); |
ac27a0ec DK |
1401 | return 0; |
1402 | } | |
8fadc143 | 1403 | inode_table = ext4_inode_table(sb, gdp); |
bd81d8ee | 1404 | if (inode_table < first_block || |
780dcdb2 | 1405 | inode_table + sbi->s_itb_per_group - 1 > last_block) |
ac27a0ec | 1406 | { |
617ba13b | 1407 | ext4_error (sb, "ext4_check_descriptors", |
ac27a0ec | 1408 | "Inode table for group %d" |
2ae02107 | 1409 | " not in group (block %llu)!", |
bd81d8ee | 1410 | i, inode_table); |
ac27a0ec DK |
1411 | return 0; |
1412 | } | |
717d50e4 AD |
1413 | if (!ext4_group_desc_csum_verify(sbi, i, gdp)) { |
1414 | ext4_error(sb, __FUNCTION__, | |
1415 | "Checksum for group %d failed (%u!=%u)\n", i, | |
1416 | le16_to_cpu(ext4_group_desc_csum(sbi, i, | |
1417 | gdp)), | |
1418 | le16_to_cpu(gdp->bg_checksum)); | |
1419 | return 0; | |
1420 | } | |
ce421581 JS |
1421 | if (!flexbg_flag) |
1422 | first_block += EXT4_BLOCKS_PER_GROUP(sb); | |
0d1ee42f AR |
1423 | gdp = (struct ext4_group_desc *) |
1424 | ((__u8 *)gdp + EXT4_DESC_SIZE(sb)); | |
ac27a0ec DK |
1425 | } |
1426 | ||
bd81d8ee | 1427 | ext4_free_blocks_count_set(sbi->s_es, ext4_count_free_blocks(sb)); |
617ba13b | 1428 | sbi->s_es->s_free_inodes_count=cpu_to_le32(ext4_count_free_inodes(sb)); |
ac27a0ec DK |
1429 | return 1; |
1430 | } | |
1431 | ||
1432 | ||
617ba13b | 1433 | /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at |
ac27a0ec DK |
1434 | * the superblock) which were deleted from all directories, but held open by |
1435 | * a process at the time of a crash. We walk the list and try to delete these | |
1436 | * inodes at recovery time (only with a read-write filesystem). | |
1437 | * | |
1438 | * In order to keep the orphan inode chain consistent during traversal (in | |
1439 | * case of crash during recovery), we link each inode into the superblock | |
1440 | * orphan list_head and handle it the same way as an inode deletion during | |
1441 | * normal operation (which journals the operations for us). | |
1442 | * | |
1443 | * We only do an iget() and an iput() on each inode, which is very safe if we | |
1444 | * accidentally point at an in-use or already deleted inode. The worst that | |
1445 | * can happen in this case is that we get a "bit already cleared" message from | |
617ba13b | 1446 | * ext4_free_inode(). The only reason we would point at a wrong inode is if |
ac27a0ec DK |
1447 | * e2fsck was run on this filesystem, and it must have already done the orphan |
1448 | * inode cleanup for us, so we can safely abort without any further action. | |
1449 | */ | |
617ba13b MC |
1450 | static void ext4_orphan_cleanup (struct super_block * sb, |
1451 | struct ext4_super_block * es) | |
ac27a0ec DK |
1452 | { |
1453 | unsigned int s_flags = sb->s_flags; | |
1454 | int nr_orphans = 0, nr_truncates = 0; | |
1455 | #ifdef CONFIG_QUOTA | |
1456 | int i; | |
1457 | #endif | |
1458 | if (!es->s_last_orphan) { | |
1459 | jbd_debug(4, "no orphan inodes to clean up\n"); | |
1460 | return; | |
1461 | } | |
1462 | ||
a8f48a95 ES |
1463 | if (bdev_read_only(sb->s_bdev)) { |
1464 | printk(KERN_ERR "EXT4-fs: write access " | |
1465 | "unavailable, skipping orphan cleanup.\n"); | |
1466 | return; | |
1467 | } | |
1468 | ||
617ba13b | 1469 | if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) { |
ac27a0ec DK |
1470 | if (es->s_last_orphan) |
1471 | jbd_debug(1, "Errors on filesystem, " | |
1472 | "clearing orphan list.\n"); | |
1473 | es->s_last_orphan = 0; | |
1474 | jbd_debug(1, "Skipping orphan recovery on fs with errors.\n"); | |
1475 | return; | |
1476 | } | |
1477 | ||
1478 | if (s_flags & MS_RDONLY) { | |
617ba13b | 1479 | printk(KERN_INFO "EXT4-fs: %s: orphan cleanup on readonly fs\n", |
ac27a0ec DK |
1480 | sb->s_id); |
1481 | sb->s_flags &= ~MS_RDONLY; | |
1482 | } | |
1483 | #ifdef CONFIG_QUOTA | |
1484 | /* Needed for iput() to work correctly and not trash data */ | |
1485 | sb->s_flags |= MS_ACTIVE; | |
1486 | /* Turn on quotas so that they are updated correctly */ | |
1487 | for (i = 0; i < MAXQUOTAS; i++) { | |
617ba13b MC |
1488 | if (EXT4_SB(sb)->s_qf_names[i]) { |
1489 | int ret = ext4_quota_on_mount(sb, i); | |
ac27a0ec DK |
1490 | if (ret < 0) |
1491 | printk(KERN_ERR | |
617ba13b | 1492 | "EXT4-fs: Cannot turn on journalled " |
ac27a0ec DK |
1493 | "quota: error %d\n", ret); |
1494 | } | |
1495 | } | |
1496 | #endif | |
1497 | ||
1498 | while (es->s_last_orphan) { | |
1499 | struct inode *inode; | |
1500 | ||
1501 | if (!(inode = | |
617ba13b | 1502 | ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan)))) { |
ac27a0ec DK |
1503 | es->s_last_orphan = 0; |
1504 | break; | |
1505 | } | |
1506 | ||
617ba13b | 1507 | list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan); |
ac27a0ec DK |
1508 | DQUOT_INIT(inode); |
1509 | if (inode->i_nlink) { | |
1510 | printk(KERN_DEBUG | |
1511 | "%s: truncating inode %lu to %Ld bytes\n", | |
1512 | __FUNCTION__, inode->i_ino, inode->i_size); | |
1513 | jbd_debug(2, "truncating inode %lu to %Ld bytes\n", | |
1514 | inode->i_ino, inode->i_size); | |
617ba13b | 1515 | ext4_truncate(inode); |
ac27a0ec DK |
1516 | nr_truncates++; |
1517 | } else { | |
1518 | printk(KERN_DEBUG | |
1519 | "%s: deleting unreferenced inode %lu\n", | |
1520 | __FUNCTION__, inode->i_ino); | |
1521 | jbd_debug(2, "deleting unreferenced inode %lu\n", | |
1522 | inode->i_ino); | |
1523 | nr_orphans++; | |
1524 | } | |
1525 | iput(inode); /* The delete magic happens here! */ | |
1526 | } | |
1527 | ||
1528 | #define PLURAL(x) (x), ((x)==1) ? "" : "s" | |
1529 | ||
1530 | if (nr_orphans) | |
617ba13b | 1531 | printk(KERN_INFO "EXT4-fs: %s: %d orphan inode%s deleted\n", |
ac27a0ec DK |
1532 | sb->s_id, PLURAL(nr_orphans)); |
1533 | if (nr_truncates) | |
617ba13b | 1534 | printk(KERN_INFO "EXT4-fs: %s: %d truncate%s cleaned up\n", |
ac27a0ec DK |
1535 | sb->s_id, PLURAL(nr_truncates)); |
1536 | #ifdef CONFIG_QUOTA | |
1537 | /* Turn quotas off */ | |
1538 | for (i = 0; i < MAXQUOTAS; i++) { | |
1539 | if (sb_dqopt(sb)->files[i]) | |
1540 | vfs_quota_off(sb, i); | |
1541 | } | |
1542 | #endif | |
1543 | sb->s_flags = s_flags; /* Restore MS_RDONLY status */ | |
1544 | } | |
1545 | ||
ac27a0ec DK |
1546 | /* |
1547 | * Maximal file size. There is a direct, and {,double-,triple-}indirect | |
1548 | * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks. | |
1549 | * We need to be 1 filesystem block less than the 2^32 sector limit. | |
1550 | */ | |
617ba13b | 1551 | static loff_t ext4_max_size(int bits) |
ac27a0ec | 1552 | { |
617ba13b | 1553 | loff_t res = EXT4_NDIR_BLOCKS; |
ac27a0ec DK |
1554 | /* This constant is calculated to be the largest file size for a |
1555 | * dense, 4k-blocksize file such that the total number of | |
1556 | * sectors in the file, including data and all indirect blocks, | |
1557 | * does not exceed 2^32. */ | |
1558 | const loff_t upper_limit = 0x1ff7fffd000LL; | |
1559 | ||
1560 | res += 1LL << (bits-2); | |
1561 | res += 1LL << (2*(bits-2)); | |
1562 | res += 1LL << (3*(bits-2)); | |
1563 | res <<= bits; | |
1564 | if (res > upper_limit) | |
1565 | res = upper_limit; | |
1566 | return res; | |
1567 | } | |
1568 | ||
617ba13b | 1569 | static ext4_fsblk_t descriptor_loc(struct super_block *sb, |
70bbb3e0 | 1570 | ext4_fsblk_t logical_sb_block, int nr) |
ac27a0ec | 1571 | { |
617ba13b | 1572 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
ac27a0ec DK |
1573 | unsigned long bg, first_meta_bg; |
1574 | int has_super = 0; | |
1575 | ||
1576 | first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg); | |
1577 | ||
617ba13b | 1578 | if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) || |
ac27a0ec | 1579 | nr < first_meta_bg) |
70bbb3e0 | 1580 | return logical_sb_block + nr + 1; |
ac27a0ec | 1581 | bg = sbi->s_desc_per_block * nr; |
617ba13b | 1582 | if (ext4_bg_has_super(sb, bg)) |
ac27a0ec | 1583 | has_super = 1; |
617ba13b | 1584 | return (has_super + ext4_group_first_block_no(sb, bg)); |
ac27a0ec DK |
1585 | } |
1586 | ||
1587 | ||
617ba13b | 1588 | static int ext4_fill_super (struct super_block *sb, void *data, int silent) |
ac27a0ec DK |
1589 | { |
1590 | struct buffer_head * bh; | |
617ba13b MC |
1591 | struct ext4_super_block *es = NULL; |
1592 | struct ext4_sb_info *sbi; | |
1593 | ext4_fsblk_t block; | |
1594 | ext4_fsblk_t sb_block = get_sb_block(&data); | |
70bbb3e0 | 1595 | ext4_fsblk_t logical_sb_block; |
ac27a0ec DK |
1596 | unsigned long offset = 0; |
1597 | unsigned int journal_inum = 0; | |
1598 | unsigned long journal_devnum = 0; | |
1599 | unsigned long def_mount_opts; | |
1600 | struct inode *root; | |
1601 | int blocksize; | |
1602 | int hblock; | |
1603 | int db_count; | |
1604 | int i; | |
1605 | int needs_recovery; | |
1606 | __le32 features; | |
bd81d8ee | 1607 | __u64 blocks_count; |
833f4077 | 1608 | int err; |
ac27a0ec DK |
1609 | |
1610 | sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); | |
1611 | if (!sbi) | |
1612 | return -ENOMEM; | |
1613 | sb->s_fs_info = sbi; | |
1614 | sbi->s_mount_opt = 0; | |
617ba13b MC |
1615 | sbi->s_resuid = EXT4_DEF_RESUID; |
1616 | sbi->s_resgid = EXT4_DEF_RESGID; | |
d9c9bef1 | 1617 | sbi->s_sb_block = sb_block; |
ac27a0ec DK |
1618 | |
1619 | unlock_kernel(); | |
1620 | ||
617ba13b | 1621 | blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE); |
ac27a0ec | 1622 | if (!blocksize) { |
617ba13b | 1623 | printk(KERN_ERR "EXT4-fs: unable to set blocksize\n"); |
ac27a0ec DK |
1624 | goto out_fail; |
1625 | } | |
1626 | ||
1627 | /* | |
617ba13b | 1628 | * The ext4 superblock will not be buffer aligned for other than 1kB |
ac27a0ec DK |
1629 | * block sizes. We need to calculate the offset from buffer start. |
1630 | */ | |
617ba13b | 1631 | if (blocksize != EXT4_MIN_BLOCK_SIZE) { |
70bbb3e0 AM |
1632 | logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE; |
1633 | offset = do_div(logical_sb_block, blocksize); | |
ac27a0ec | 1634 | } else { |
70bbb3e0 | 1635 | logical_sb_block = sb_block; |
ac27a0ec DK |
1636 | } |
1637 | ||
70bbb3e0 | 1638 | if (!(bh = sb_bread(sb, logical_sb_block))) { |
617ba13b | 1639 | printk (KERN_ERR "EXT4-fs: unable to read superblock\n"); |
ac27a0ec DK |
1640 | goto out_fail; |
1641 | } | |
1642 | /* | |
1643 | * Note: s_es must be initialized as soon as possible because | |
617ba13b | 1644 | * some ext4 macro-instructions depend on its value |
ac27a0ec | 1645 | */ |
617ba13b | 1646 | es = (struct ext4_super_block *) (((char *)bh->b_data) + offset); |
ac27a0ec DK |
1647 | sbi->s_es = es; |
1648 | sb->s_magic = le16_to_cpu(es->s_magic); | |
617ba13b MC |
1649 | if (sb->s_magic != EXT4_SUPER_MAGIC) |
1650 | goto cantfind_ext4; | |
ac27a0ec DK |
1651 | |
1652 | /* Set defaults before we parse the mount options */ | |
1653 | def_mount_opts = le32_to_cpu(es->s_default_mount_opts); | |
617ba13b | 1654 | if (def_mount_opts & EXT4_DEFM_DEBUG) |
ac27a0ec | 1655 | set_opt(sbi->s_mount_opt, DEBUG); |
617ba13b | 1656 | if (def_mount_opts & EXT4_DEFM_BSDGROUPS) |
ac27a0ec | 1657 | set_opt(sbi->s_mount_opt, GRPID); |
617ba13b | 1658 | if (def_mount_opts & EXT4_DEFM_UID16) |
ac27a0ec | 1659 | set_opt(sbi->s_mount_opt, NO_UID32); |
2e7842b8 | 1660 | #ifdef CONFIG_EXT4DEV_FS_XATTR |
617ba13b | 1661 | if (def_mount_opts & EXT4_DEFM_XATTR_USER) |
ac27a0ec | 1662 | set_opt(sbi->s_mount_opt, XATTR_USER); |
2e7842b8 HD |
1663 | #endif |
1664 | #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL | |
617ba13b | 1665 | if (def_mount_opts & EXT4_DEFM_ACL) |
ac27a0ec | 1666 | set_opt(sbi->s_mount_opt, POSIX_ACL); |
2e7842b8 | 1667 | #endif |
617ba13b MC |
1668 | if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA) |
1669 | sbi->s_mount_opt |= EXT4_MOUNT_JOURNAL_DATA; | |
1670 | else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED) | |
1671 | sbi->s_mount_opt |= EXT4_MOUNT_ORDERED_DATA; | |
1672 | else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK) | |
1673 | sbi->s_mount_opt |= EXT4_MOUNT_WRITEBACK_DATA; | |
1674 | ||
1675 | if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC) | |
ac27a0ec | 1676 | set_opt(sbi->s_mount_opt, ERRORS_PANIC); |
617ba13b | 1677 | else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_RO) |
ac27a0ec | 1678 | set_opt(sbi->s_mount_opt, ERRORS_RO); |
ceea16bf DM |
1679 | else |
1680 | set_opt(sbi->s_mount_opt, ERRORS_CONT); | |
ac27a0ec DK |
1681 | |
1682 | sbi->s_resuid = le16_to_cpu(es->s_def_resuid); | |
1683 | sbi->s_resgid = le16_to_cpu(es->s_def_resgid); | |
1684 | ||
1685 | set_opt(sbi->s_mount_opt, RESERVATION); | |
1686 | ||
1e2462f9 MC |
1687 | /* |
1688 | * turn on extents feature by default in ext4 filesystem | |
1689 | * User -o noextents to turn it off | |
1690 | */ | |
1691 | set_opt(sbi->s_mount_opt, EXTENTS); | |
1692 | ||
ac27a0ec DK |
1693 | if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum, |
1694 | NULL, 0)) | |
1695 | goto failed_mount; | |
1696 | ||
1697 | sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | | |
617ba13b | 1698 | ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0); |
ac27a0ec | 1699 | |
617ba13b MC |
1700 | if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV && |
1701 | (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) || | |
1702 | EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) || | |
1703 | EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U))) | |
ac27a0ec | 1704 | printk(KERN_WARNING |
617ba13b | 1705 | "EXT4-fs warning: feature flags set on rev 0 fs, " |
ac27a0ec DK |
1706 | "running e2fsck is recommended\n"); |
1707 | /* | |
1708 | * Check feature flags regardless of the revision level, since we | |
1709 | * previously didn't change the revision level when setting the flags, | |
1710 | * so there is a chance incompat flags are set on a rev 0 filesystem. | |
1711 | */ | |
617ba13b | 1712 | features = EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP); |
ac27a0ec | 1713 | if (features) { |
617ba13b | 1714 | printk(KERN_ERR "EXT4-fs: %s: couldn't mount because of " |
ac27a0ec DK |
1715 | "unsupported optional features (%x).\n", |
1716 | sb->s_id, le32_to_cpu(features)); | |
1717 | goto failed_mount; | |
1718 | } | |
617ba13b | 1719 | features = EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP); |
ac27a0ec | 1720 | if (!(sb->s_flags & MS_RDONLY) && features) { |
617ba13b | 1721 | printk(KERN_ERR "EXT4-fs: %s: couldn't mount RDWR because of " |
ac27a0ec DK |
1722 | "unsupported optional features (%x).\n", |
1723 | sb->s_id, le32_to_cpu(features)); | |
1724 | goto failed_mount; | |
1725 | } | |
1726 | blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size); | |
1727 | ||
617ba13b MC |
1728 | if (blocksize < EXT4_MIN_BLOCK_SIZE || |
1729 | blocksize > EXT4_MAX_BLOCK_SIZE) { | |
ac27a0ec | 1730 | printk(KERN_ERR |
617ba13b | 1731 | "EXT4-fs: Unsupported filesystem blocksize %d on %s.\n", |
ac27a0ec DK |
1732 | blocksize, sb->s_id); |
1733 | goto failed_mount; | |
1734 | } | |
1735 | ||
1736 | hblock = bdev_hardsect_size(sb->s_bdev); | |
1737 | if (sb->s_blocksize != blocksize) { | |
1738 | /* | |
1739 | * Make sure the blocksize for the filesystem is larger | |
1740 | * than the hardware sectorsize for the machine. | |
1741 | */ | |
1742 | if (blocksize < hblock) { | |
617ba13b | 1743 | printk(KERN_ERR "EXT4-fs: blocksize %d too small for " |
ac27a0ec DK |
1744 | "device blocksize %d.\n", blocksize, hblock); |
1745 | goto failed_mount; | |
1746 | } | |
1747 | ||
1748 | brelse (bh); | |
1749 | sb_set_blocksize(sb, blocksize); | |
70bbb3e0 AM |
1750 | logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE; |
1751 | offset = do_div(logical_sb_block, blocksize); | |
1752 | bh = sb_bread(sb, logical_sb_block); | |
ac27a0ec DK |
1753 | if (!bh) { |
1754 | printk(KERN_ERR | |
617ba13b | 1755 | "EXT4-fs: Can't read superblock on 2nd try.\n"); |
ac27a0ec DK |
1756 | goto failed_mount; |
1757 | } | |
617ba13b | 1758 | es = (struct ext4_super_block *)(((char *)bh->b_data) + offset); |
ac27a0ec | 1759 | sbi->s_es = es; |
617ba13b | 1760 | if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) { |
ac27a0ec | 1761 | printk (KERN_ERR |
617ba13b | 1762 | "EXT4-fs: Magic mismatch, very weird !\n"); |
ac27a0ec DK |
1763 | goto failed_mount; |
1764 | } | |
1765 | } | |
1766 | ||
617ba13b | 1767 | sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits); |
ac27a0ec | 1768 | |
617ba13b MC |
1769 | if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) { |
1770 | sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE; | |
1771 | sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO; | |
ac27a0ec DK |
1772 | } else { |
1773 | sbi->s_inode_size = le16_to_cpu(es->s_inode_size); | |
1774 | sbi->s_first_ino = le32_to_cpu(es->s_first_ino); | |
617ba13b | 1775 | if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) || |
1330593e | 1776 | (!is_power_of_2(sbi->s_inode_size)) || |
ac27a0ec DK |
1777 | (sbi->s_inode_size > blocksize)) { |
1778 | printk (KERN_ERR | |
617ba13b | 1779 | "EXT4-fs: unsupported inode size: %d\n", |
ac27a0ec DK |
1780 | sbi->s_inode_size); |
1781 | goto failed_mount; | |
1782 | } | |
ef7f3835 KS |
1783 | if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) |
1784 | sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2); | |
ac27a0ec | 1785 | } |
0d1ee42f AR |
1786 | sbi->s_desc_size = le16_to_cpu(es->s_desc_size); |
1787 | if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) { | |
8fadc143 | 1788 | if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT || |
0d1ee42f | 1789 | sbi->s_desc_size > EXT4_MAX_DESC_SIZE || |
d8ea6cf8 | 1790 | !is_power_of_2(sbi->s_desc_size)) { |
0d1ee42f | 1791 | printk(KERN_ERR |
8fadc143 | 1792 | "EXT4-fs: unsupported descriptor size %lu\n", |
0d1ee42f AR |
1793 | sbi->s_desc_size); |
1794 | goto failed_mount; | |
1795 | } | |
1796 | } else | |
1797 | sbi->s_desc_size = EXT4_MIN_DESC_SIZE; | |
ac27a0ec | 1798 | sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group); |
ac27a0ec | 1799 | sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group); |
617ba13b MC |
1800 | if (EXT4_INODE_SIZE(sb) == 0) |
1801 | goto cantfind_ext4; | |
1802 | sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb); | |
ac27a0ec | 1803 | if (sbi->s_inodes_per_block == 0) |
617ba13b | 1804 | goto cantfind_ext4; |
ac27a0ec DK |
1805 | sbi->s_itb_per_group = sbi->s_inodes_per_group / |
1806 | sbi->s_inodes_per_block; | |
0d1ee42f | 1807 | sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb); |
ac27a0ec DK |
1808 | sbi->s_sbh = bh; |
1809 | sbi->s_mount_state = le16_to_cpu(es->s_state); | |
e57aa839 FW |
1810 | sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb)); |
1811 | sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb)); | |
ac27a0ec DK |
1812 | for (i=0; i < 4; i++) |
1813 | sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]); | |
1814 | sbi->s_def_hash_version = es->s_def_hash_version; | |
1815 | ||
1816 | if (sbi->s_blocks_per_group > blocksize * 8) { | |
1817 | printk (KERN_ERR | |
617ba13b | 1818 | "EXT4-fs: #blocks per group too big: %lu\n", |
ac27a0ec DK |
1819 | sbi->s_blocks_per_group); |
1820 | goto failed_mount; | |
1821 | } | |
ac27a0ec DK |
1822 | if (sbi->s_inodes_per_group > blocksize * 8) { |
1823 | printk (KERN_ERR | |
617ba13b | 1824 | "EXT4-fs: #inodes per group too big: %lu\n", |
ac27a0ec DK |
1825 | sbi->s_inodes_per_group); |
1826 | goto failed_mount; | |
1827 | } | |
1828 | ||
bd81d8ee | 1829 | if (ext4_blocks_count(es) > |
ac27a0ec | 1830 | (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) { |
617ba13b | 1831 | printk(KERN_ERR "EXT4-fs: filesystem on %s:" |
ac27a0ec DK |
1832 | " too large to mount safely\n", sb->s_id); |
1833 | if (sizeof(sector_t) < 8) | |
617ba13b | 1834 | printk(KERN_WARNING "EXT4-fs: CONFIG_LBD not " |
ac27a0ec DK |
1835 | "enabled\n"); |
1836 | goto failed_mount; | |
1837 | } | |
1838 | ||
617ba13b MC |
1839 | if (EXT4_BLOCKS_PER_GROUP(sb) == 0) |
1840 | goto cantfind_ext4; | |
bd81d8ee LV |
1841 | blocks_count = (ext4_blocks_count(es) - |
1842 | le32_to_cpu(es->s_first_data_block) + | |
1843 | EXT4_BLOCKS_PER_GROUP(sb) - 1); | |
1844 | do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb)); | |
1845 | sbi->s_groups_count = blocks_count; | |
617ba13b MC |
1846 | db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) / |
1847 | EXT4_DESC_PER_BLOCK(sb); | |
ac27a0ec DK |
1848 | sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *), |
1849 | GFP_KERNEL); | |
1850 | if (sbi->s_group_desc == NULL) { | |
617ba13b | 1851 | printk (KERN_ERR "EXT4-fs: not enough memory\n"); |
ac27a0ec DK |
1852 | goto failed_mount; |
1853 | } | |
1854 | ||
1855 | bgl_lock_init(&sbi->s_blockgroup_lock); | |
1856 | ||
1857 | for (i = 0; i < db_count; i++) { | |
70bbb3e0 | 1858 | block = descriptor_loc(sb, logical_sb_block, i); |
ac27a0ec DK |
1859 | sbi->s_group_desc[i] = sb_bread(sb, block); |
1860 | if (!sbi->s_group_desc[i]) { | |
617ba13b | 1861 | printk (KERN_ERR "EXT4-fs: " |
ac27a0ec DK |
1862 | "can't read group descriptor %d\n", i); |
1863 | db_count = i; | |
1864 | goto failed_mount2; | |
1865 | } | |
1866 | } | |
617ba13b MC |
1867 | if (!ext4_check_descriptors (sb)) { |
1868 | printk(KERN_ERR "EXT4-fs: group descriptors corrupted!\n"); | |
ac27a0ec DK |
1869 | goto failed_mount2; |
1870 | } | |
1871 | sbi->s_gdb_count = db_count; | |
1872 | get_random_bytes(&sbi->s_next_generation, sizeof(u32)); | |
1873 | spin_lock_init(&sbi->s_next_gen_lock); | |
1874 | ||
833f4077 PZ |
1875 | err = percpu_counter_init(&sbi->s_freeblocks_counter, |
1876 | ext4_count_free_blocks(sb)); | |
1877 | if (!err) { | |
1878 | err = percpu_counter_init(&sbi->s_freeinodes_counter, | |
1879 | ext4_count_free_inodes(sb)); | |
1880 | } | |
1881 | if (!err) { | |
1882 | err = percpu_counter_init(&sbi->s_dirs_counter, | |
1883 | ext4_count_dirs(sb)); | |
1884 | } | |
1885 | if (err) { | |
1886 | printk(KERN_ERR "EXT4-fs: insufficient memory\n"); | |
1887 | goto failed_mount3; | |
1888 | } | |
ac27a0ec DK |
1889 | |
1890 | /* per fileystem reservation list head & lock */ | |
1891 | spin_lock_init(&sbi->s_rsv_window_lock); | |
1892 | sbi->s_rsv_window_root = RB_ROOT; | |
1893 | /* Add a single, static dummy reservation to the start of the | |
1894 | * reservation window list --- it gives us a placeholder for | |
1895 | * append-at-start-of-list which makes the allocation logic | |
1896 | * _much_ simpler. */ | |
617ba13b MC |
1897 | sbi->s_rsv_window_head.rsv_start = EXT4_RESERVE_WINDOW_NOT_ALLOCATED; |
1898 | sbi->s_rsv_window_head.rsv_end = EXT4_RESERVE_WINDOW_NOT_ALLOCATED; | |
ac27a0ec DK |
1899 | sbi->s_rsv_window_head.rsv_alloc_hit = 0; |
1900 | sbi->s_rsv_window_head.rsv_goal_size = 0; | |
617ba13b | 1901 | ext4_rsv_window_add(sb, &sbi->s_rsv_window_head); |
ac27a0ec DK |
1902 | |
1903 | /* | |
1904 | * set up enough so that it can read an inode | |
1905 | */ | |
617ba13b MC |
1906 | sb->s_op = &ext4_sops; |
1907 | sb->s_export_op = &ext4_export_ops; | |
1908 | sb->s_xattr = ext4_xattr_handlers; | |
ac27a0ec | 1909 | #ifdef CONFIG_QUOTA |
617ba13b MC |
1910 | sb->s_qcop = &ext4_qctl_operations; |
1911 | sb->dq_op = &ext4_quota_operations; | |
ac27a0ec DK |
1912 | #endif |
1913 | INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */ | |
1914 | ||
1915 | sb->s_root = NULL; | |
1916 | ||
1917 | needs_recovery = (es->s_last_orphan != 0 || | |
617ba13b MC |
1918 | EXT4_HAS_INCOMPAT_FEATURE(sb, |
1919 | EXT4_FEATURE_INCOMPAT_RECOVER)); | |
ac27a0ec DK |
1920 | |
1921 | /* | |
1922 | * The first inode we look at is the journal inode. Don't try | |
1923 | * root first: it may be modified in the journal! | |
1924 | */ | |
1925 | if (!test_opt(sb, NOLOAD) && | |
617ba13b MC |
1926 | EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) { |
1927 | if (ext4_load_journal(sb, es, journal_devnum)) | |
ac27a0ec DK |
1928 | goto failed_mount3; |
1929 | } else if (journal_inum) { | |
617ba13b | 1930 | if (ext4_create_journal(sb, es, journal_inum)) |
ac27a0ec DK |
1931 | goto failed_mount3; |
1932 | } else { | |
1933 | if (!silent) | |
1934 | printk (KERN_ERR | |
617ba13b | 1935 | "ext4: No journal on filesystem on %s\n", |
ac27a0ec DK |
1936 | sb->s_id); |
1937 | goto failed_mount3; | |
1938 | } | |
1939 | ||
eb40a09c JS |
1940 | if (ext4_blocks_count(es) > 0xffffffffULL && |
1941 | !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0, | |
1942 | JBD2_FEATURE_INCOMPAT_64BIT)) { | |
1943 | printk(KERN_ERR "ext4: Failed to set 64-bit journal feature\n"); | |
1944 | goto failed_mount4; | |
1945 | } | |
1946 | ||
ac27a0ec DK |
1947 | /* We have now updated the journal if required, so we can |
1948 | * validate the data journaling mode. */ | |
1949 | switch (test_opt(sb, DATA_FLAGS)) { | |
1950 | case 0: | |
1951 | /* No mode set, assume a default based on the journal | |
63f57933 AM |
1952 | * capabilities: ORDERED_DATA if the journal can |
1953 | * cope, else JOURNAL_DATA | |
1954 | */ | |
dab291af MC |
1955 | if (jbd2_journal_check_available_features |
1956 | (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) | |
ac27a0ec DK |
1957 | set_opt(sbi->s_mount_opt, ORDERED_DATA); |
1958 | else | |
1959 | set_opt(sbi->s_mount_opt, JOURNAL_DATA); | |
1960 | break; | |
1961 | ||
617ba13b MC |
1962 | case EXT4_MOUNT_ORDERED_DATA: |
1963 | case EXT4_MOUNT_WRITEBACK_DATA: | |
dab291af MC |
1964 | if (!jbd2_journal_check_available_features |
1965 | (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) { | |
617ba13b | 1966 | printk(KERN_ERR "EXT4-fs: Journal does not support " |
ac27a0ec DK |
1967 | "requested data journaling mode\n"); |
1968 | goto failed_mount4; | |
1969 | } | |
1970 | default: | |
1971 | break; | |
1972 | } | |
1973 | ||
1974 | if (test_opt(sb, NOBH)) { | |
617ba13b MC |
1975 | if (!(test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)) { |
1976 | printk(KERN_WARNING "EXT4-fs: Ignoring nobh option - " | |
ac27a0ec DK |
1977 | "its supported only with writeback mode\n"); |
1978 | clear_opt(sbi->s_mount_opt, NOBH); | |
1979 | } | |
1980 | } | |
1981 | /* | |
dab291af | 1982 | * The jbd2_journal_load will have done any necessary log recovery, |
ac27a0ec DK |
1983 | * so we can safely mount the rest of the filesystem now. |
1984 | */ | |
1985 | ||
617ba13b | 1986 | root = iget(sb, EXT4_ROOT_INO); |
ac27a0ec DK |
1987 | sb->s_root = d_alloc_root(root); |
1988 | if (!sb->s_root) { | |
617ba13b | 1989 | printk(KERN_ERR "EXT4-fs: get root inode failed\n"); |
ac27a0ec DK |
1990 | iput(root); |
1991 | goto failed_mount4; | |
1992 | } | |
1993 | if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { | |
1994 | dput(sb->s_root); | |
1995 | sb->s_root = NULL; | |
617ba13b | 1996 | printk(KERN_ERR "EXT4-fs: corrupt root inode, run e2fsck\n"); |
ac27a0ec DK |
1997 | goto failed_mount4; |
1998 | } | |
1999 | ||
617ba13b | 2000 | ext4_setup_super (sb, es, sb->s_flags & MS_RDONLY); |
ef7f3835 KS |
2001 | |
2002 | /* determine the minimum size of new large inodes, if present */ | |
2003 | if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) { | |
2004 | sbi->s_want_extra_isize = sizeof(struct ext4_inode) - | |
2005 | EXT4_GOOD_OLD_INODE_SIZE; | |
2006 | if (EXT4_HAS_RO_COMPAT_FEATURE(sb, | |
2007 | EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) { | |
2008 | if (sbi->s_want_extra_isize < | |
2009 | le16_to_cpu(es->s_want_extra_isize)) | |
2010 | sbi->s_want_extra_isize = | |
2011 | le16_to_cpu(es->s_want_extra_isize); | |
2012 | if (sbi->s_want_extra_isize < | |
2013 | le16_to_cpu(es->s_min_extra_isize)) | |
2014 | sbi->s_want_extra_isize = | |
2015 | le16_to_cpu(es->s_min_extra_isize); | |
2016 | } | |
2017 | } | |
2018 | /* Check if enough inode space is available */ | |
2019 | if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize > | |
2020 | sbi->s_inode_size) { | |
2021 | sbi->s_want_extra_isize = sizeof(struct ext4_inode) - | |
2022 | EXT4_GOOD_OLD_INODE_SIZE; | |
2023 | printk(KERN_INFO "EXT4-fs: required extra inode space not" | |
2024 | "available.\n"); | |
2025 | } | |
2026 | ||
ac27a0ec DK |
2027 | /* |
2028 | * akpm: core read_super() calls in here with the superblock locked. | |
2029 | * That deadlocks, because orphan cleanup needs to lock the superblock | |
2030 | * in numerous places. Here we just pop the lock - it's relatively | |
2031 | * harmless, because we are now ready to accept write_super() requests, | |
2032 | * and aviro says that's the only reason for hanging onto the | |
2033 | * superblock lock. | |
2034 | */ | |
617ba13b MC |
2035 | EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS; |
2036 | ext4_orphan_cleanup(sb, es); | |
2037 | EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS; | |
ac27a0ec | 2038 | if (needs_recovery) |
617ba13b MC |
2039 | printk (KERN_INFO "EXT4-fs: recovery complete.\n"); |
2040 | ext4_mark_recovery_complete(sb, es); | |
2041 | printk (KERN_INFO "EXT4-fs: mounted filesystem with %s data mode.\n", | |
2042 | test_opt(sb,DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA ? "journal": | |
2043 | test_opt(sb,DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA ? "ordered": | |
ac27a0ec DK |
2044 | "writeback"); |
2045 | ||
a86c6181 AT |
2046 | ext4_ext_init(sb); |
2047 | ||
ac27a0ec DK |
2048 | lock_kernel(); |
2049 | return 0; | |
2050 | ||
617ba13b | 2051 | cantfind_ext4: |
ac27a0ec | 2052 | if (!silent) |
617ba13b | 2053 | printk(KERN_ERR "VFS: Can't find ext4 filesystem on dev %s.\n", |
ac27a0ec DK |
2054 | sb->s_id); |
2055 | goto failed_mount; | |
2056 | ||
2057 | failed_mount4: | |
dab291af | 2058 | jbd2_journal_destroy(sbi->s_journal); |
ac27a0ec DK |
2059 | failed_mount3: |
2060 | percpu_counter_destroy(&sbi->s_freeblocks_counter); | |
2061 | percpu_counter_destroy(&sbi->s_freeinodes_counter); | |
2062 | percpu_counter_destroy(&sbi->s_dirs_counter); | |
2063 | failed_mount2: | |
2064 | for (i = 0; i < db_count; i++) | |
2065 | brelse(sbi->s_group_desc[i]); | |
2066 | kfree(sbi->s_group_desc); | |
2067 | failed_mount: | |
2068 | #ifdef CONFIG_QUOTA | |
2069 | for (i = 0; i < MAXQUOTAS; i++) | |
2070 | kfree(sbi->s_qf_names[i]); | |
2071 | #endif | |
617ba13b | 2072 | ext4_blkdev_remove(sbi); |
ac27a0ec DK |
2073 | brelse(bh); |
2074 | out_fail: | |
2075 | sb->s_fs_info = NULL; | |
2076 | kfree(sbi); | |
2077 | lock_kernel(); | |
2078 | return -EINVAL; | |
2079 | } | |
2080 | ||
2081 | /* | |
2082 | * Setup any per-fs journal parameters now. We'll do this both on | |
2083 | * initial mount, once the journal has been initialised but before we've | |
2084 | * done any recovery; and again on any subsequent remount. | |
2085 | */ | |
617ba13b | 2086 | static void ext4_init_journal_params(struct super_block *sb, journal_t *journal) |
ac27a0ec | 2087 | { |
617ba13b | 2088 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
ac27a0ec DK |
2089 | |
2090 | if (sbi->s_commit_interval) | |
2091 | journal->j_commit_interval = sbi->s_commit_interval; | |
617ba13b | 2092 | /* We could also set up an ext4-specific default for the commit |
ac27a0ec DK |
2093 | * interval here, but for now we'll just fall back to the jbd |
2094 | * default. */ | |
2095 | ||
2096 | spin_lock(&journal->j_state_lock); | |
2097 | if (test_opt(sb, BARRIER)) | |
dab291af | 2098 | journal->j_flags |= JBD2_BARRIER; |
ac27a0ec | 2099 | else |
dab291af | 2100 | journal->j_flags &= ~JBD2_BARRIER; |
ac27a0ec DK |
2101 | spin_unlock(&journal->j_state_lock); |
2102 | } | |
2103 | ||
617ba13b | 2104 | static journal_t *ext4_get_journal(struct super_block *sb, |
ac27a0ec DK |
2105 | unsigned int journal_inum) |
2106 | { | |
2107 | struct inode *journal_inode; | |
2108 | journal_t *journal; | |
2109 | ||
2110 | /* First, test for the existence of a valid inode on disk. Bad | |
2111 | * things happen if we iget() an unused inode, as the subsequent | |
2112 | * iput() will try to delete it. */ | |
2113 | ||
2114 | journal_inode = iget(sb, journal_inum); | |
2115 | if (!journal_inode) { | |
617ba13b | 2116 | printk(KERN_ERR "EXT4-fs: no journal found.\n"); |
ac27a0ec DK |
2117 | return NULL; |
2118 | } | |
2119 | if (!journal_inode->i_nlink) { | |
2120 | make_bad_inode(journal_inode); | |
2121 | iput(journal_inode); | |
617ba13b | 2122 | printk(KERN_ERR "EXT4-fs: journal inode is deleted.\n"); |
ac27a0ec DK |
2123 | return NULL; |
2124 | } | |
2125 | ||
2126 | jbd_debug(2, "Journal inode found at %p: %Ld bytes\n", | |
2127 | journal_inode, journal_inode->i_size); | |
2128 | if (is_bad_inode(journal_inode) || !S_ISREG(journal_inode->i_mode)) { | |
617ba13b | 2129 | printk(KERN_ERR "EXT4-fs: invalid journal inode.\n"); |
ac27a0ec DK |
2130 | iput(journal_inode); |
2131 | return NULL; | |
2132 | } | |
2133 | ||
dab291af | 2134 | journal = jbd2_journal_init_inode(journal_inode); |
ac27a0ec | 2135 | if (!journal) { |
617ba13b | 2136 | printk(KERN_ERR "EXT4-fs: Could not load journal inode\n"); |
ac27a0ec DK |
2137 | iput(journal_inode); |
2138 | return NULL; | |
2139 | } | |
2140 | journal->j_private = sb; | |
617ba13b | 2141 | ext4_init_journal_params(sb, journal); |
ac27a0ec DK |
2142 | return journal; |
2143 | } | |
2144 | ||
617ba13b | 2145 | static journal_t *ext4_get_dev_journal(struct super_block *sb, |
ac27a0ec DK |
2146 | dev_t j_dev) |
2147 | { | |
2148 | struct buffer_head * bh; | |
2149 | journal_t *journal; | |
617ba13b MC |
2150 | ext4_fsblk_t start; |
2151 | ext4_fsblk_t len; | |
ac27a0ec | 2152 | int hblock, blocksize; |
617ba13b | 2153 | ext4_fsblk_t sb_block; |
ac27a0ec | 2154 | unsigned long offset; |
617ba13b | 2155 | struct ext4_super_block * es; |
ac27a0ec DK |
2156 | struct block_device *bdev; |
2157 | ||
617ba13b | 2158 | bdev = ext4_blkdev_get(j_dev); |
ac27a0ec DK |
2159 | if (bdev == NULL) |
2160 | return NULL; | |
2161 | ||
2162 | if (bd_claim(bdev, sb)) { | |
2163 | printk(KERN_ERR | |
8c55e204 | 2164 | "EXT4: failed to claim external journal device.\n"); |
ac27a0ec DK |
2165 | blkdev_put(bdev); |
2166 | return NULL; | |
2167 | } | |
2168 | ||
2169 | blocksize = sb->s_blocksize; | |
2170 | hblock = bdev_hardsect_size(bdev); | |
2171 | if (blocksize < hblock) { | |
2172 | printk(KERN_ERR | |
617ba13b | 2173 | "EXT4-fs: blocksize too small for journal device.\n"); |
ac27a0ec DK |
2174 | goto out_bdev; |
2175 | } | |
2176 | ||
617ba13b MC |
2177 | sb_block = EXT4_MIN_BLOCK_SIZE / blocksize; |
2178 | offset = EXT4_MIN_BLOCK_SIZE % blocksize; | |
ac27a0ec DK |
2179 | set_blocksize(bdev, blocksize); |
2180 | if (!(bh = __bread(bdev, sb_block, blocksize))) { | |
617ba13b | 2181 | printk(KERN_ERR "EXT4-fs: couldn't read superblock of " |
ac27a0ec DK |
2182 | "external journal\n"); |
2183 | goto out_bdev; | |
2184 | } | |
2185 | ||
617ba13b MC |
2186 | es = (struct ext4_super_block *) (((char *)bh->b_data) + offset); |
2187 | if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) || | |
ac27a0ec | 2188 | !(le32_to_cpu(es->s_feature_incompat) & |
617ba13b MC |
2189 | EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) { |
2190 | printk(KERN_ERR "EXT4-fs: external journal has " | |
ac27a0ec DK |
2191 | "bad superblock\n"); |
2192 | brelse(bh); | |
2193 | goto out_bdev; | |
2194 | } | |
2195 | ||
617ba13b MC |
2196 | if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) { |
2197 | printk(KERN_ERR "EXT4-fs: journal UUID does not match\n"); | |
ac27a0ec DK |
2198 | brelse(bh); |
2199 | goto out_bdev; | |
2200 | } | |
2201 | ||
bd81d8ee | 2202 | len = ext4_blocks_count(es); |
ac27a0ec DK |
2203 | start = sb_block + 1; |
2204 | brelse(bh); /* we're done with the superblock */ | |
2205 | ||
dab291af | 2206 | journal = jbd2_journal_init_dev(bdev, sb->s_bdev, |
ac27a0ec DK |
2207 | start, len, blocksize); |
2208 | if (!journal) { | |
617ba13b | 2209 | printk(KERN_ERR "EXT4-fs: failed to create device journal\n"); |
ac27a0ec DK |
2210 | goto out_bdev; |
2211 | } | |
2212 | journal->j_private = sb; | |
2213 | ll_rw_block(READ, 1, &journal->j_sb_buffer); | |
2214 | wait_on_buffer(journal->j_sb_buffer); | |
2215 | if (!buffer_uptodate(journal->j_sb_buffer)) { | |
617ba13b | 2216 | printk(KERN_ERR "EXT4-fs: I/O error on journal device\n"); |
ac27a0ec DK |
2217 | goto out_journal; |
2218 | } | |
2219 | if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) { | |
617ba13b | 2220 | printk(KERN_ERR "EXT4-fs: External journal has more than one " |
ac27a0ec DK |
2221 | "user (unsupported) - %d\n", |
2222 | be32_to_cpu(journal->j_superblock->s_nr_users)); | |
2223 | goto out_journal; | |
2224 | } | |
617ba13b MC |
2225 | EXT4_SB(sb)->journal_bdev = bdev; |
2226 | ext4_init_journal_params(sb, journal); | |
ac27a0ec DK |
2227 | return journal; |
2228 | out_journal: | |
dab291af | 2229 | jbd2_journal_destroy(journal); |
ac27a0ec | 2230 | out_bdev: |
617ba13b | 2231 | ext4_blkdev_put(bdev); |
ac27a0ec DK |
2232 | return NULL; |
2233 | } | |
2234 | ||
617ba13b MC |
2235 | static int ext4_load_journal(struct super_block *sb, |
2236 | struct ext4_super_block *es, | |
ac27a0ec DK |
2237 | unsigned long journal_devnum) |
2238 | { | |
2239 | journal_t *journal; | |
2240 | unsigned int journal_inum = le32_to_cpu(es->s_journal_inum); | |
2241 | dev_t journal_dev; | |
2242 | int err = 0; | |
2243 | int really_read_only; | |
2244 | ||
2245 | if (journal_devnum && | |
2246 | journal_devnum != le32_to_cpu(es->s_journal_dev)) { | |
617ba13b | 2247 | printk(KERN_INFO "EXT4-fs: external journal device major/minor " |
ac27a0ec DK |
2248 | "numbers have changed\n"); |
2249 | journal_dev = new_decode_dev(journal_devnum); | |
2250 | } else | |
2251 | journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev)); | |
2252 | ||
2253 | really_read_only = bdev_read_only(sb->s_bdev); | |
2254 | ||
2255 | /* | |
2256 | * Are we loading a blank journal or performing recovery after a | |
2257 | * crash? For recovery, we need to check in advance whether we | |
2258 | * can get read-write access to the device. | |
2259 | */ | |
2260 | ||
617ba13b | 2261 | if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) { |
ac27a0ec | 2262 | if (sb->s_flags & MS_RDONLY) { |
617ba13b | 2263 | printk(KERN_INFO "EXT4-fs: INFO: recovery " |
ac27a0ec DK |
2264 | "required on readonly filesystem.\n"); |
2265 | if (really_read_only) { | |
617ba13b | 2266 | printk(KERN_ERR "EXT4-fs: write access " |
ac27a0ec DK |
2267 | "unavailable, cannot proceed.\n"); |
2268 | return -EROFS; | |
2269 | } | |
617ba13b | 2270 | printk (KERN_INFO "EXT4-fs: write access will " |
ac27a0ec DK |
2271 | "be enabled during recovery.\n"); |
2272 | } | |
2273 | } | |
2274 | ||
2275 | if (journal_inum && journal_dev) { | |
617ba13b | 2276 | printk(KERN_ERR "EXT4-fs: filesystem has both journal " |
ac27a0ec DK |
2277 | "and inode journals!\n"); |
2278 | return -EINVAL; | |
2279 | } | |
2280 | ||
2281 | if (journal_inum) { | |
617ba13b | 2282 | if (!(journal = ext4_get_journal(sb, journal_inum))) |
ac27a0ec DK |
2283 | return -EINVAL; |
2284 | } else { | |
617ba13b | 2285 | if (!(journal = ext4_get_dev_journal(sb, journal_dev))) |
ac27a0ec DK |
2286 | return -EINVAL; |
2287 | } | |
2288 | ||
2289 | if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) { | |
dab291af | 2290 | err = jbd2_journal_update_format(journal); |
ac27a0ec | 2291 | if (err) { |
617ba13b | 2292 | printk(KERN_ERR "EXT4-fs: error updating journal.\n"); |
dab291af | 2293 | jbd2_journal_destroy(journal); |
ac27a0ec DK |
2294 | return err; |
2295 | } | |
2296 | } | |
2297 | ||
617ba13b | 2298 | if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) |
dab291af | 2299 | err = jbd2_journal_wipe(journal, !really_read_only); |
ac27a0ec | 2300 | if (!err) |
dab291af | 2301 | err = jbd2_journal_load(journal); |
ac27a0ec DK |
2302 | |
2303 | if (err) { | |
617ba13b | 2304 | printk(KERN_ERR "EXT4-fs: error loading journal.\n"); |
dab291af | 2305 | jbd2_journal_destroy(journal); |
ac27a0ec DK |
2306 | return err; |
2307 | } | |
2308 | ||
617ba13b MC |
2309 | EXT4_SB(sb)->s_journal = journal; |
2310 | ext4_clear_journal_err(sb, es); | |
ac27a0ec DK |
2311 | |
2312 | if (journal_devnum && | |
2313 | journal_devnum != le32_to_cpu(es->s_journal_dev)) { | |
2314 | es->s_journal_dev = cpu_to_le32(journal_devnum); | |
2315 | sb->s_dirt = 1; | |
2316 | ||
2317 | /* Make sure we flush the recovery flag to disk. */ | |
617ba13b | 2318 | ext4_commit_super(sb, es, 1); |
ac27a0ec DK |
2319 | } |
2320 | ||
2321 | return 0; | |
2322 | } | |
2323 | ||
617ba13b MC |
2324 | static int ext4_create_journal(struct super_block * sb, |
2325 | struct ext4_super_block * es, | |
ac27a0ec DK |
2326 | unsigned int journal_inum) |
2327 | { | |
2328 | journal_t *journal; | |
6c675bd4 | 2329 | int err; |
ac27a0ec DK |
2330 | |
2331 | if (sb->s_flags & MS_RDONLY) { | |
617ba13b | 2332 | printk(KERN_ERR "EXT4-fs: readonly filesystem when trying to " |
ac27a0ec DK |
2333 | "create journal.\n"); |
2334 | return -EROFS; | |
2335 | } | |
2336 | ||
6c675bd4 BP |
2337 | journal = ext4_get_journal(sb, journal_inum); |
2338 | if (!journal) | |
ac27a0ec DK |
2339 | return -EINVAL; |
2340 | ||
617ba13b | 2341 | printk(KERN_INFO "EXT4-fs: creating new journal on inode %u\n", |
ac27a0ec DK |
2342 | journal_inum); |
2343 | ||
6c675bd4 BP |
2344 | err = jbd2_journal_create(journal); |
2345 | if (err) { | |
617ba13b | 2346 | printk(KERN_ERR "EXT4-fs: error creating journal.\n"); |
dab291af | 2347 | jbd2_journal_destroy(journal); |
ac27a0ec DK |
2348 | return -EIO; |
2349 | } | |
2350 | ||
617ba13b | 2351 | EXT4_SB(sb)->s_journal = journal; |
ac27a0ec | 2352 | |
617ba13b MC |
2353 | ext4_update_dynamic_rev(sb); |
2354 | EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); | |
2355 | EXT4_SET_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL); | |
ac27a0ec DK |
2356 | |
2357 | es->s_journal_inum = cpu_to_le32(journal_inum); | |
2358 | sb->s_dirt = 1; | |
2359 | ||
2360 | /* Make sure we flush the recovery flag to disk. */ | |
617ba13b | 2361 | ext4_commit_super(sb, es, 1); |
ac27a0ec DK |
2362 | |
2363 | return 0; | |
2364 | } | |
2365 | ||
617ba13b MC |
2366 | static void ext4_commit_super (struct super_block * sb, |
2367 | struct ext4_super_block * es, | |
ac27a0ec DK |
2368 | int sync) |
2369 | { | |
617ba13b | 2370 | struct buffer_head *sbh = EXT4_SB(sb)->s_sbh; |
ac27a0ec DK |
2371 | |
2372 | if (!sbh) | |
2373 | return; | |
2374 | es->s_wtime = cpu_to_le32(get_seconds()); | |
bd81d8ee | 2375 | ext4_free_blocks_count_set(es, ext4_count_free_blocks(sb)); |
617ba13b | 2376 | es->s_free_inodes_count = cpu_to_le32(ext4_count_free_inodes(sb)); |
ac27a0ec DK |
2377 | BUFFER_TRACE(sbh, "marking dirty"); |
2378 | mark_buffer_dirty(sbh); | |
2379 | if (sync) | |
2380 | sync_dirty_buffer(sbh); | |
2381 | } | |
2382 | ||
2383 | ||
2384 | /* | |
2385 | * Have we just finished recovery? If so, and if we are mounting (or | |
2386 | * remounting) the filesystem readonly, then we will end up with a | |
2387 | * consistent fs on disk. Record that fact. | |
2388 | */ | |
617ba13b MC |
2389 | static void ext4_mark_recovery_complete(struct super_block * sb, |
2390 | struct ext4_super_block * es) | |
ac27a0ec | 2391 | { |
617ba13b | 2392 | journal_t *journal = EXT4_SB(sb)->s_journal; |
ac27a0ec | 2393 | |
dab291af MC |
2394 | jbd2_journal_lock_updates(journal); |
2395 | jbd2_journal_flush(journal); | |
32c37730 | 2396 | lock_super(sb); |
617ba13b | 2397 | if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) && |
ac27a0ec | 2398 | sb->s_flags & MS_RDONLY) { |
617ba13b | 2399 | EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); |
ac27a0ec | 2400 | sb->s_dirt = 0; |
617ba13b | 2401 | ext4_commit_super(sb, es, 1); |
ac27a0ec | 2402 | } |
32c37730 | 2403 | unlock_super(sb); |
dab291af | 2404 | jbd2_journal_unlock_updates(journal); |
ac27a0ec DK |
2405 | } |
2406 | ||
2407 | /* | |
2408 | * If we are mounting (or read-write remounting) a filesystem whose journal | |
2409 | * has recorded an error from a previous lifetime, move that error to the | |
2410 | * main filesystem now. | |
2411 | */ | |
617ba13b MC |
2412 | static void ext4_clear_journal_err(struct super_block * sb, |
2413 | struct ext4_super_block * es) | |
ac27a0ec DK |
2414 | { |
2415 | journal_t *journal; | |
2416 | int j_errno; | |
2417 | const char *errstr; | |
2418 | ||
617ba13b | 2419 | journal = EXT4_SB(sb)->s_journal; |
ac27a0ec DK |
2420 | |
2421 | /* | |
2422 | * Now check for any error status which may have been recorded in the | |
617ba13b | 2423 | * journal by a prior ext4_error() or ext4_abort() |
ac27a0ec DK |
2424 | */ |
2425 | ||
dab291af | 2426 | j_errno = jbd2_journal_errno(journal); |
ac27a0ec DK |
2427 | if (j_errno) { |
2428 | char nbuf[16]; | |
2429 | ||
617ba13b MC |
2430 | errstr = ext4_decode_error(sb, j_errno, nbuf); |
2431 | ext4_warning(sb, __FUNCTION__, "Filesystem error recorded " | |
ac27a0ec | 2432 | "from previous mount: %s", errstr); |
617ba13b | 2433 | ext4_warning(sb, __FUNCTION__, "Marking fs in need of " |
ac27a0ec DK |
2434 | "filesystem check."); |
2435 | ||
617ba13b MC |
2436 | EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; |
2437 | es->s_state |= cpu_to_le16(EXT4_ERROR_FS); | |
2438 | ext4_commit_super (sb, es, 1); | |
ac27a0ec | 2439 | |
dab291af | 2440 | jbd2_journal_clear_err(journal); |
ac27a0ec DK |
2441 | } |
2442 | } | |
2443 | ||
2444 | /* | |
2445 | * Force the running and committing transactions to commit, | |
2446 | * and wait on the commit. | |
2447 | */ | |
617ba13b | 2448 | int ext4_force_commit(struct super_block *sb) |
ac27a0ec DK |
2449 | { |
2450 | journal_t *journal; | |
2451 | int ret; | |
2452 | ||
2453 | if (sb->s_flags & MS_RDONLY) | |
2454 | return 0; | |
2455 | ||
617ba13b | 2456 | journal = EXT4_SB(sb)->s_journal; |
ac27a0ec | 2457 | sb->s_dirt = 0; |
617ba13b | 2458 | ret = ext4_journal_force_commit(journal); |
ac27a0ec DK |
2459 | return ret; |
2460 | } | |
2461 | ||
2462 | /* | |
617ba13b | 2463 | * Ext4 always journals updates to the superblock itself, so we don't |
ac27a0ec DK |
2464 | * have to propagate any other updates to the superblock on disk at this |
2465 | * point. Just start an async writeback to get the buffers on their way | |
2466 | * to the disk. | |
2467 | * | |
2468 | * This implicitly triggers the writebehind on sync(). | |
2469 | */ | |
2470 | ||
617ba13b | 2471 | static void ext4_write_super (struct super_block * sb) |
ac27a0ec DK |
2472 | { |
2473 | if (mutex_trylock(&sb->s_lock) != 0) | |
2474 | BUG(); | |
2475 | sb->s_dirt = 0; | |
2476 | } | |
2477 | ||
617ba13b | 2478 | static int ext4_sync_fs(struct super_block *sb, int wait) |
ac27a0ec DK |
2479 | { |
2480 | tid_t target; | |
2481 | ||
2482 | sb->s_dirt = 0; | |
dab291af | 2483 | if (jbd2_journal_start_commit(EXT4_SB(sb)->s_journal, &target)) { |
ac27a0ec | 2484 | if (wait) |
dab291af | 2485 | jbd2_log_wait_commit(EXT4_SB(sb)->s_journal, target); |
ac27a0ec DK |
2486 | } |
2487 | return 0; | |
2488 | } | |
2489 | ||
2490 | /* | |
2491 | * LVM calls this function before a (read-only) snapshot is created. This | |
2492 | * gives us a chance to flush the journal completely and mark the fs clean. | |
2493 | */ | |
617ba13b | 2494 | static void ext4_write_super_lockfs(struct super_block *sb) |
ac27a0ec DK |
2495 | { |
2496 | sb->s_dirt = 0; | |
2497 | ||
2498 | if (!(sb->s_flags & MS_RDONLY)) { | |
617ba13b | 2499 | journal_t *journal = EXT4_SB(sb)->s_journal; |
ac27a0ec DK |
2500 | |
2501 | /* Now we set up the journal barrier. */ | |
dab291af MC |
2502 | jbd2_journal_lock_updates(journal); |
2503 | jbd2_journal_flush(journal); | |
ac27a0ec DK |
2504 | |
2505 | /* Journal blocked and flushed, clear needs_recovery flag. */ | |
617ba13b MC |
2506 | EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); |
2507 | ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1); | |
ac27a0ec DK |
2508 | } |
2509 | } | |
2510 | ||
2511 | /* | |
2512 | * Called by LVM after the snapshot is done. We need to reset the RECOVER | |
2513 | * flag here, even though the filesystem is not technically dirty yet. | |
2514 | */ | |
617ba13b | 2515 | static void ext4_unlockfs(struct super_block *sb) |
ac27a0ec DK |
2516 | { |
2517 | if (!(sb->s_flags & MS_RDONLY)) { | |
2518 | lock_super(sb); | |
2519 | /* Reser the needs_recovery flag before the fs is unlocked. */ | |
617ba13b MC |
2520 | EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); |
2521 | ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1); | |
ac27a0ec | 2522 | unlock_super(sb); |
dab291af | 2523 | jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); |
ac27a0ec DK |
2524 | } |
2525 | } | |
2526 | ||
617ba13b | 2527 | static int ext4_remount (struct super_block * sb, int * flags, char * data) |
ac27a0ec | 2528 | { |
617ba13b MC |
2529 | struct ext4_super_block * es; |
2530 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
2531 | ext4_fsblk_t n_blocks_count = 0; | |
ac27a0ec | 2532 | unsigned long old_sb_flags; |
617ba13b | 2533 | struct ext4_mount_options old_opts; |
ac27a0ec DK |
2534 | int err; |
2535 | #ifdef CONFIG_QUOTA | |
2536 | int i; | |
2537 | #endif | |
2538 | ||
2539 | /* Store the original options */ | |
2540 | old_sb_flags = sb->s_flags; | |
2541 | old_opts.s_mount_opt = sbi->s_mount_opt; | |
2542 | old_opts.s_resuid = sbi->s_resuid; | |
2543 | old_opts.s_resgid = sbi->s_resgid; | |
2544 | old_opts.s_commit_interval = sbi->s_commit_interval; | |
2545 | #ifdef CONFIG_QUOTA | |
2546 | old_opts.s_jquota_fmt = sbi->s_jquota_fmt; | |
2547 | for (i = 0; i < MAXQUOTAS; i++) | |
2548 | old_opts.s_qf_names[i] = sbi->s_qf_names[i]; | |
2549 | #endif | |
2550 | ||
2551 | /* | |
2552 | * Allow the "check" option to be passed as a remount option. | |
2553 | */ | |
2554 | if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) { | |
2555 | err = -EINVAL; | |
2556 | goto restore_opts; | |
2557 | } | |
2558 | ||
617ba13b MC |
2559 | if (sbi->s_mount_opt & EXT4_MOUNT_ABORT) |
2560 | ext4_abort(sb, __FUNCTION__, "Abort forced by user"); | |
ac27a0ec DK |
2561 | |
2562 | sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | | |
617ba13b | 2563 | ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0); |
ac27a0ec DK |
2564 | |
2565 | es = sbi->s_es; | |
2566 | ||
617ba13b | 2567 | ext4_init_journal_params(sb, sbi->s_journal); |
ac27a0ec DK |
2568 | |
2569 | if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) || | |
bd81d8ee | 2570 | n_blocks_count > ext4_blocks_count(es)) { |
617ba13b | 2571 | if (sbi->s_mount_opt & EXT4_MOUNT_ABORT) { |
ac27a0ec DK |
2572 | err = -EROFS; |
2573 | goto restore_opts; | |
2574 | } | |
2575 | ||
2576 | if (*flags & MS_RDONLY) { | |
2577 | /* | |
2578 | * First of all, the unconditional stuff we have to do | |
2579 | * to disable replay of the journal when we next remount | |
2580 | */ | |
2581 | sb->s_flags |= MS_RDONLY; | |
2582 | ||
2583 | /* | |
2584 | * OK, test if we are remounting a valid rw partition | |
2585 | * readonly, and if so set the rdonly flag and then | |
2586 | * mark the partition as valid again. | |
2587 | */ | |
617ba13b MC |
2588 | if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) && |
2589 | (sbi->s_mount_state & EXT4_VALID_FS)) | |
ac27a0ec DK |
2590 | es->s_state = cpu_to_le16(sbi->s_mount_state); |
2591 | ||
32c37730 JK |
2592 | /* |
2593 | * We have to unlock super so that we can wait for | |
2594 | * transactions. | |
2595 | */ | |
2596 | unlock_super(sb); | |
617ba13b | 2597 | ext4_mark_recovery_complete(sb, es); |
32c37730 | 2598 | lock_super(sb); |
ac27a0ec DK |
2599 | } else { |
2600 | __le32 ret; | |
617ba13b MC |
2601 | if ((ret = EXT4_HAS_RO_COMPAT_FEATURE(sb, |
2602 | ~EXT4_FEATURE_RO_COMPAT_SUPP))) { | |
2603 | printk(KERN_WARNING "EXT4-fs: %s: couldn't " | |
ac27a0ec DK |
2604 | "remount RDWR because of unsupported " |
2605 | "optional features (%x).\n", | |
2606 | sb->s_id, le32_to_cpu(ret)); | |
2607 | err = -EROFS; | |
2608 | goto restore_opts; | |
2609 | } | |
ead6596b ES |
2610 | |
2611 | /* | |
2612 | * If we have an unprocessed orphan list hanging | |
2613 | * around from a previously readonly bdev mount, | |
2614 | * require a full umount/remount for now. | |
2615 | */ | |
2616 | if (es->s_last_orphan) { | |
2617 | printk(KERN_WARNING "EXT4-fs: %s: couldn't " | |
2618 | "remount RDWR because of unprocessed " | |
2619 | "orphan inode list. Please " | |
2620 | "umount/remount instead.\n", | |
2621 | sb->s_id); | |
2622 | err = -EINVAL; | |
2623 | goto restore_opts; | |
2624 | } | |
2625 | ||
ac27a0ec DK |
2626 | /* |
2627 | * Mounting a RDONLY partition read-write, so reread | |
2628 | * and store the current valid flag. (It may have | |
2629 | * been changed by e2fsck since we originally mounted | |
2630 | * the partition.) | |
2631 | */ | |
617ba13b | 2632 | ext4_clear_journal_err(sb, es); |
ac27a0ec | 2633 | sbi->s_mount_state = le16_to_cpu(es->s_state); |
617ba13b | 2634 | if ((err = ext4_group_extend(sb, es, n_blocks_count))) |
ac27a0ec | 2635 | goto restore_opts; |
617ba13b | 2636 | if (!ext4_setup_super (sb, es, 0)) |
ac27a0ec DK |
2637 | sb->s_flags &= ~MS_RDONLY; |
2638 | } | |
2639 | } | |
2640 | #ifdef CONFIG_QUOTA | |
2641 | /* Release old quota file names */ | |
2642 | for (i = 0; i < MAXQUOTAS; i++) | |
2643 | if (old_opts.s_qf_names[i] && | |
2644 | old_opts.s_qf_names[i] != sbi->s_qf_names[i]) | |
2645 | kfree(old_opts.s_qf_names[i]); | |
2646 | #endif | |
2647 | return 0; | |
2648 | restore_opts: | |
2649 | sb->s_flags = old_sb_flags; | |
2650 | sbi->s_mount_opt = old_opts.s_mount_opt; | |
2651 | sbi->s_resuid = old_opts.s_resuid; | |
2652 | sbi->s_resgid = old_opts.s_resgid; | |
2653 | sbi->s_commit_interval = old_opts.s_commit_interval; | |
2654 | #ifdef CONFIG_QUOTA | |
2655 | sbi->s_jquota_fmt = old_opts.s_jquota_fmt; | |
2656 | for (i = 0; i < MAXQUOTAS; i++) { | |
2657 | if (sbi->s_qf_names[i] && | |
2658 | old_opts.s_qf_names[i] != sbi->s_qf_names[i]) | |
2659 | kfree(sbi->s_qf_names[i]); | |
2660 | sbi->s_qf_names[i] = old_opts.s_qf_names[i]; | |
2661 | } | |
2662 | #endif | |
2663 | return err; | |
2664 | } | |
2665 | ||
617ba13b | 2666 | static int ext4_statfs (struct dentry * dentry, struct kstatfs * buf) |
ac27a0ec DK |
2667 | { |
2668 | struct super_block *sb = dentry->d_sb; | |
617ba13b MC |
2669 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
2670 | struct ext4_super_block *es = sbi->s_es; | |
960cc398 | 2671 | u64 fsid; |
ac27a0ec | 2672 | |
5e70030d BP |
2673 | if (test_opt(sb, MINIX_DF)) { |
2674 | sbi->s_overhead_last = 0; | |
6bc9feff | 2675 | } else if (sbi->s_blocks_last != ext4_blocks_count(es)) { |
5e70030d BP |
2676 | unsigned long ngroups = sbi->s_groups_count, i; |
2677 | ext4_fsblk_t overhead = 0; | |
ac27a0ec DK |
2678 | smp_rmb(); |
2679 | ||
2680 | /* | |
5e70030d BP |
2681 | * Compute the overhead (FS structures). This is constant |
2682 | * for a given filesystem unless the number of block groups | |
2683 | * changes so we cache the previous value until it does. | |
ac27a0ec DK |
2684 | */ |
2685 | ||
2686 | /* | |
2687 | * All of the blocks before first_data_block are | |
2688 | * overhead | |
2689 | */ | |
2690 | overhead = le32_to_cpu(es->s_first_data_block); | |
2691 | ||
2692 | /* | |
2693 | * Add the overhead attributed to the superblock and | |
2694 | * block group descriptors. If the sparse superblocks | |
2695 | * feature is turned on, then not all groups have this. | |
2696 | */ | |
2697 | for (i = 0; i < ngroups; i++) { | |
617ba13b MC |
2698 | overhead += ext4_bg_has_super(sb, i) + |
2699 | ext4_bg_num_gdb(sb, i); | |
ac27a0ec DK |
2700 | cond_resched(); |
2701 | } | |
2702 | ||
2703 | /* | |
2704 | * Every block group has an inode bitmap, a block | |
2705 | * bitmap, and an inode table. | |
2706 | */ | |
5e70030d BP |
2707 | overhead += ngroups * (2 + sbi->s_itb_per_group); |
2708 | sbi->s_overhead_last = overhead; | |
2709 | smp_wmb(); | |
6bc9feff | 2710 | sbi->s_blocks_last = ext4_blocks_count(es); |
ac27a0ec DK |
2711 | } |
2712 | ||
617ba13b | 2713 | buf->f_type = EXT4_SUPER_MAGIC; |
ac27a0ec | 2714 | buf->f_bsize = sb->s_blocksize; |
5e70030d | 2715 | buf->f_blocks = ext4_blocks_count(es) - sbi->s_overhead_last; |
52d9f3b4 | 2716 | buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter); |
308ba3ec | 2717 | ext4_free_blocks_count_set(es, buf->f_bfree); |
bd81d8ee LV |
2718 | buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es); |
2719 | if (buf->f_bfree < ext4_r_blocks_count(es)) | |
ac27a0ec DK |
2720 | buf->f_bavail = 0; |
2721 | buf->f_files = le32_to_cpu(es->s_inodes_count); | |
52d9f3b4 | 2722 | buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter); |
5e70030d | 2723 | es->s_free_inodes_count = cpu_to_le32(buf->f_ffree); |
617ba13b | 2724 | buf->f_namelen = EXT4_NAME_LEN; |
960cc398 PE |
2725 | fsid = le64_to_cpup((void *)es->s_uuid) ^ |
2726 | le64_to_cpup((void *)es->s_uuid + sizeof(u64)); | |
2727 | buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL; | |
2728 | buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL; | |
ac27a0ec DK |
2729 | return 0; |
2730 | } | |
2731 | ||
2732 | /* Helper function for writing quotas on sync - we need to start transaction before quota file | |
2733 | * is locked for write. Otherwise the are possible deadlocks: | |
2734 | * Process 1 Process 2 | |
617ba13b | 2735 | * ext4_create() quota_sync() |
dab291af | 2736 | * jbd2_journal_start() write_dquot() |
ac27a0ec | 2737 | * DQUOT_INIT() down(dqio_mutex) |
dab291af | 2738 | * down(dqio_mutex) jbd2_journal_start() |
ac27a0ec DK |
2739 | * |
2740 | */ | |
2741 | ||
2742 | #ifdef CONFIG_QUOTA | |
2743 | ||
2744 | static inline struct inode *dquot_to_inode(struct dquot *dquot) | |
2745 | { | |
2746 | return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type]; | |
2747 | } | |
2748 | ||
617ba13b | 2749 | static int ext4_dquot_initialize(struct inode *inode, int type) |
ac27a0ec DK |
2750 | { |
2751 | handle_t *handle; | |
2752 | int ret, err; | |
2753 | ||
2754 | /* We may create quota structure so we need to reserve enough blocks */ | |
617ba13b | 2755 | handle = ext4_journal_start(inode, 2*EXT4_QUOTA_INIT_BLOCKS(inode->i_sb)); |
ac27a0ec DK |
2756 | if (IS_ERR(handle)) |
2757 | return PTR_ERR(handle); | |
2758 | ret = dquot_initialize(inode, type); | |
617ba13b | 2759 | err = ext4_journal_stop(handle); |
ac27a0ec DK |
2760 | if (!ret) |
2761 | ret = err; | |
2762 | return ret; | |
2763 | } | |
2764 | ||
617ba13b | 2765 | static int ext4_dquot_drop(struct inode *inode) |
ac27a0ec DK |
2766 | { |
2767 | handle_t *handle; | |
2768 | int ret, err; | |
2769 | ||
2770 | /* We may delete quota structure so we need to reserve enough blocks */ | |
617ba13b | 2771 | handle = ext4_journal_start(inode, 2*EXT4_QUOTA_DEL_BLOCKS(inode->i_sb)); |
ac27a0ec DK |
2772 | if (IS_ERR(handle)) |
2773 | return PTR_ERR(handle); | |
2774 | ret = dquot_drop(inode); | |
617ba13b | 2775 | err = ext4_journal_stop(handle); |
ac27a0ec DK |
2776 | if (!ret) |
2777 | ret = err; | |
2778 | return ret; | |
2779 | } | |
2780 | ||
617ba13b | 2781 | static int ext4_write_dquot(struct dquot *dquot) |
ac27a0ec DK |
2782 | { |
2783 | int ret, err; | |
2784 | handle_t *handle; | |
2785 | struct inode *inode; | |
2786 | ||
2787 | inode = dquot_to_inode(dquot); | |
617ba13b MC |
2788 | handle = ext4_journal_start(inode, |
2789 | EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb)); | |
ac27a0ec DK |
2790 | if (IS_ERR(handle)) |
2791 | return PTR_ERR(handle); | |
2792 | ret = dquot_commit(dquot); | |
617ba13b | 2793 | err = ext4_journal_stop(handle); |
ac27a0ec DK |
2794 | if (!ret) |
2795 | ret = err; | |
2796 | return ret; | |
2797 | } | |
2798 | ||
617ba13b | 2799 | static int ext4_acquire_dquot(struct dquot *dquot) |
ac27a0ec DK |
2800 | { |
2801 | int ret, err; | |
2802 | handle_t *handle; | |
2803 | ||
617ba13b MC |
2804 | handle = ext4_journal_start(dquot_to_inode(dquot), |
2805 | EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb)); | |
ac27a0ec DK |
2806 | if (IS_ERR(handle)) |
2807 | return PTR_ERR(handle); | |
2808 | ret = dquot_acquire(dquot); | |
617ba13b | 2809 | err = ext4_journal_stop(handle); |
ac27a0ec DK |
2810 | if (!ret) |
2811 | ret = err; | |
2812 | return ret; | |
2813 | } | |
2814 | ||
617ba13b | 2815 | static int ext4_release_dquot(struct dquot *dquot) |
ac27a0ec DK |
2816 | { |
2817 | int ret, err; | |
2818 | handle_t *handle; | |
2819 | ||
617ba13b MC |
2820 | handle = ext4_journal_start(dquot_to_inode(dquot), |
2821 | EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb)); | |
9c3013e9 JK |
2822 | if (IS_ERR(handle)) { |
2823 | /* Release dquot anyway to avoid endless cycle in dqput() */ | |
2824 | dquot_release(dquot); | |
ac27a0ec | 2825 | return PTR_ERR(handle); |
9c3013e9 | 2826 | } |
ac27a0ec | 2827 | ret = dquot_release(dquot); |
617ba13b | 2828 | err = ext4_journal_stop(handle); |
ac27a0ec DK |
2829 | if (!ret) |
2830 | ret = err; | |
2831 | return ret; | |
2832 | } | |
2833 | ||
617ba13b | 2834 | static int ext4_mark_dquot_dirty(struct dquot *dquot) |
ac27a0ec DK |
2835 | { |
2836 | /* Are we journalling quotas? */ | |
617ba13b MC |
2837 | if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] || |
2838 | EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) { | |
ac27a0ec | 2839 | dquot_mark_dquot_dirty(dquot); |
617ba13b | 2840 | return ext4_write_dquot(dquot); |
ac27a0ec DK |
2841 | } else { |
2842 | return dquot_mark_dquot_dirty(dquot); | |
2843 | } | |
2844 | } | |
2845 | ||
617ba13b | 2846 | static int ext4_write_info(struct super_block *sb, int type) |
ac27a0ec DK |
2847 | { |
2848 | int ret, err; | |
2849 | handle_t *handle; | |
2850 | ||
2851 | /* Data block + inode block */ | |
617ba13b | 2852 | handle = ext4_journal_start(sb->s_root->d_inode, 2); |
ac27a0ec DK |
2853 | if (IS_ERR(handle)) |
2854 | return PTR_ERR(handle); | |
2855 | ret = dquot_commit_info(sb, type); | |
617ba13b | 2856 | err = ext4_journal_stop(handle); |
ac27a0ec DK |
2857 | if (!ret) |
2858 | ret = err; | |
2859 | return ret; | |
2860 | } | |
2861 | ||
2862 | /* | |
2863 | * Turn on quotas during mount time - we need to find | |
2864 | * the quota file and such... | |
2865 | */ | |
617ba13b | 2866 | static int ext4_quota_on_mount(struct super_block *sb, int type) |
ac27a0ec | 2867 | { |
617ba13b MC |
2868 | return vfs_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type], |
2869 | EXT4_SB(sb)->s_jquota_fmt, type); | |
ac27a0ec DK |
2870 | } |
2871 | ||
2872 | /* | |
2873 | * Standard function to be called on quota_on | |
2874 | */ | |
617ba13b | 2875 | static int ext4_quota_on(struct super_block *sb, int type, int format_id, |
ac27a0ec DK |
2876 | char *path) |
2877 | { | |
2878 | int err; | |
2879 | struct nameidata nd; | |
2880 | ||
2881 | if (!test_opt(sb, QUOTA)) | |
2882 | return -EINVAL; | |
2883 | /* Not journalling quota? */ | |
617ba13b MC |
2884 | if (!EXT4_SB(sb)->s_qf_names[USRQUOTA] && |
2885 | !EXT4_SB(sb)->s_qf_names[GRPQUOTA]) | |
ac27a0ec DK |
2886 | return vfs_quota_on(sb, type, format_id, path); |
2887 | err = path_lookup(path, LOOKUP_FOLLOW, &nd); | |
2888 | if (err) | |
2889 | return err; | |
2890 | /* Quotafile not on the same filesystem? */ | |
2891 | if (nd.mnt->mnt_sb != sb) { | |
2892 | path_release(&nd); | |
2893 | return -EXDEV; | |
2894 | } | |
2895 | /* Quotafile not of fs root? */ | |
2896 | if (nd.dentry->d_parent->d_inode != sb->s_root->d_inode) | |
2897 | printk(KERN_WARNING | |
617ba13b | 2898 | "EXT4-fs: Quota file not on filesystem root. " |
ac27a0ec DK |
2899 | "Journalled quota will not work.\n"); |
2900 | path_release(&nd); | |
2901 | return vfs_quota_on(sb, type, format_id, path); | |
2902 | } | |
2903 | ||
2904 | /* Read data from quotafile - avoid pagecache and such because we cannot afford | |
2905 | * acquiring the locks... As quota files are never truncated and quota code | |
2906 | * itself serializes the operations (and noone else should touch the files) | |
2907 | * we don't have to be afraid of races */ | |
617ba13b | 2908 | static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data, |
ac27a0ec DK |
2909 | size_t len, loff_t off) |
2910 | { | |
2911 | struct inode *inode = sb_dqopt(sb)->files[type]; | |
617ba13b | 2912 | sector_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb); |
ac27a0ec DK |
2913 | int err = 0; |
2914 | int offset = off & (sb->s_blocksize - 1); | |
2915 | int tocopy; | |
2916 | size_t toread; | |
2917 | struct buffer_head *bh; | |
2918 | loff_t i_size = i_size_read(inode); | |
2919 | ||
2920 | if (off > i_size) | |
2921 | return 0; | |
2922 | if (off+len > i_size) | |
2923 | len = i_size-off; | |
2924 | toread = len; | |
2925 | while (toread > 0) { | |
2926 | tocopy = sb->s_blocksize - offset < toread ? | |
2927 | sb->s_blocksize - offset : toread; | |
617ba13b | 2928 | bh = ext4_bread(NULL, inode, blk, 0, &err); |
ac27a0ec DK |
2929 | if (err) |
2930 | return err; | |
2931 | if (!bh) /* A hole? */ | |
2932 | memset(data, 0, tocopy); | |
2933 | else | |
2934 | memcpy(data, bh->b_data+offset, tocopy); | |
2935 | brelse(bh); | |
2936 | offset = 0; | |
2937 | toread -= tocopy; | |
2938 | data += tocopy; | |
2939 | blk++; | |
2940 | } | |
2941 | return len; | |
2942 | } | |
2943 | ||
2944 | /* Write to quotafile (we know the transaction is already started and has | |
2945 | * enough credits) */ | |
617ba13b | 2946 | static ssize_t ext4_quota_write(struct super_block *sb, int type, |
ac27a0ec DK |
2947 | const char *data, size_t len, loff_t off) |
2948 | { | |
2949 | struct inode *inode = sb_dqopt(sb)->files[type]; | |
617ba13b | 2950 | sector_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb); |
ac27a0ec DK |
2951 | int err = 0; |
2952 | int offset = off & (sb->s_blocksize - 1); | |
2953 | int tocopy; | |
617ba13b | 2954 | int journal_quota = EXT4_SB(sb)->s_qf_names[type] != NULL; |
ac27a0ec DK |
2955 | size_t towrite = len; |
2956 | struct buffer_head *bh; | |
2957 | handle_t *handle = journal_current_handle(); | |
2958 | ||
9c3013e9 JK |
2959 | if (!handle) { |
2960 | printk(KERN_WARNING "EXT4-fs: Quota write (off=%Lu, len=%Lu)" | |
2961 | " cancelled because transaction is not started.\n", | |
2962 | (unsigned long long)off, (unsigned long long)len); | |
2963 | return -EIO; | |
2964 | } | |
ac27a0ec DK |
2965 | mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA); |
2966 | while (towrite > 0) { | |
2967 | tocopy = sb->s_blocksize - offset < towrite ? | |
2968 | sb->s_blocksize - offset : towrite; | |
617ba13b | 2969 | bh = ext4_bread(handle, inode, blk, 1, &err); |
ac27a0ec DK |
2970 | if (!bh) |
2971 | goto out; | |
2972 | if (journal_quota) { | |
617ba13b | 2973 | err = ext4_journal_get_write_access(handle, bh); |
ac27a0ec DK |
2974 | if (err) { |
2975 | brelse(bh); | |
2976 | goto out; | |
2977 | } | |
2978 | } | |
2979 | lock_buffer(bh); | |
2980 | memcpy(bh->b_data+offset, data, tocopy); | |
2981 | flush_dcache_page(bh->b_page); | |
2982 | unlock_buffer(bh); | |
2983 | if (journal_quota) | |
617ba13b | 2984 | err = ext4_journal_dirty_metadata(handle, bh); |
ac27a0ec DK |
2985 | else { |
2986 | /* Always do at least ordered writes for quotas */ | |
617ba13b | 2987 | err = ext4_journal_dirty_data(handle, bh); |
ac27a0ec DK |
2988 | mark_buffer_dirty(bh); |
2989 | } | |
2990 | brelse(bh); | |
2991 | if (err) | |
2992 | goto out; | |
2993 | offset = 0; | |
2994 | towrite -= tocopy; | |
2995 | data += tocopy; | |
2996 | blk++; | |
2997 | } | |
2998 | out: | |
2999 | if (len == towrite) | |
3000 | return err; | |
3001 | if (inode->i_size < off+len-towrite) { | |
3002 | i_size_write(inode, off+len-towrite); | |
617ba13b | 3003 | EXT4_I(inode)->i_disksize = inode->i_size; |
ac27a0ec DK |
3004 | } |
3005 | inode->i_version++; | |
3006 | inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
617ba13b | 3007 | ext4_mark_inode_dirty(handle, inode); |
ac27a0ec DK |
3008 | mutex_unlock(&inode->i_mutex); |
3009 | return len - towrite; | |
3010 | } | |
3011 | ||
3012 | #endif | |
3013 | ||
617ba13b | 3014 | static int ext4_get_sb(struct file_system_type *fs_type, |
ac27a0ec DK |
3015 | int flags, const char *dev_name, void *data, struct vfsmount *mnt) |
3016 | { | |
617ba13b | 3017 | return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super, mnt); |
ac27a0ec DK |
3018 | } |
3019 | ||
617ba13b | 3020 | static struct file_system_type ext4dev_fs_type = { |
ac27a0ec | 3021 | .owner = THIS_MODULE, |
617ba13b MC |
3022 | .name = "ext4dev", |
3023 | .get_sb = ext4_get_sb, | |
ac27a0ec DK |
3024 | .kill_sb = kill_block_super, |
3025 | .fs_flags = FS_REQUIRES_DEV, | |
3026 | }; | |
3027 | ||
617ba13b | 3028 | static int __init init_ext4_fs(void) |
ac27a0ec | 3029 | { |
617ba13b | 3030 | int err = init_ext4_xattr(); |
ac27a0ec DK |
3031 | if (err) |
3032 | return err; | |
3033 | err = init_inodecache(); | |
3034 | if (err) | |
3035 | goto out1; | |
63f57933 | 3036 | err = register_filesystem(&ext4dev_fs_type); |
ac27a0ec DK |
3037 | if (err) |
3038 | goto out; | |
3039 | return 0; | |
3040 | out: | |
3041 | destroy_inodecache(); | |
3042 | out1: | |
617ba13b | 3043 | exit_ext4_xattr(); |
ac27a0ec DK |
3044 | return err; |
3045 | } | |
3046 | ||
617ba13b | 3047 | static void __exit exit_ext4_fs(void) |
ac27a0ec | 3048 | { |
617ba13b | 3049 | unregister_filesystem(&ext4dev_fs_type); |
ac27a0ec | 3050 | destroy_inodecache(); |
617ba13b | 3051 | exit_ext4_xattr(); |
ac27a0ec DK |
3052 | } |
3053 | ||
3054 | MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others"); | |
617ba13b | 3055 | MODULE_DESCRIPTION("Fourth Extended Filesystem with extents"); |
ac27a0ec | 3056 | MODULE_LICENSE("GPL"); |
617ba13b MC |
3057 | module_init(init_ext4_fs) |
3058 | module_exit(exit_ext4_fs) |