Commit | Line | Data |
---|---|---|
ac27a0ec | 1 | /* |
617ba13b | 2 | * linux/fs/ext4/super.c |
ac27a0ec DK |
3 | * |
4 | * Copyright (C) 1992, 1993, 1994, 1995 | |
5 | * Remy Card (card@masi.ibp.fr) | |
6 | * Laboratoire MASI - Institut Blaise Pascal | |
7 | * Universite Pierre et Marie Curie (Paris VI) | |
8 | * | |
9 | * from | |
10 | * | |
11 | * linux/fs/minix/inode.c | |
12 | * | |
13 | * Copyright (C) 1991, 1992 Linus Torvalds | |
14 | * | |
15 | * Big-endian to little-endian byte-swapping/bitmaps by | |
16 | * David S. Miller (davem@caip.rutgers.edu), 1995 | |
17 | */ | |
18 | ||
19 | #include <linux/module.h> | |
20 | #include <linux/string.h> | |
21 | #include <linux/fs.h> | |
22 | #include <linux/time.h> | |
dab291af | 23 | #include <linux/jbd2.h> |
ac27a0ec DK |
24 | #include <linux/slab.h> |
25 | #include <linux/init.h> | |
26 | #include <linux/blkdev.h> | |
27 | #include <linux/parser.h> | |
28 | #include <linux/smp_lock.h> | |
29 | #include <linux/buffer_head.h> | |
a5694255 | 30 | #include <linux/exportfs.h> |
ac27a0ec DK |
31 | #include <linux/vfs.h> |
32 | #include <linux/random.h> | |
33 | #include <linux/mount.h> | |
34 | #include <linux/namei.h> | |
35 | #include <linux/quotaops.h> | |
36 | #include <linux/seq_file.h> | |
9f6200bb | 37 | #include <linux/proc_fs.h> |
ede86cc4 | 38 | #include <linux/marker.h> |
1330593e | 39 | #include <linux/log2.h> |
717d50e4 | 40 | #include <linux/crc16.h> |
ac27a0ec DK |
41 | #include <asm/uaccess.h> |
42 | ||
3dcf5451 CH |
43 | #include "ext4.h" |
44 | #include "ext4_jbd2.h" | |
ac27a0ec DK |
45 | #include "xattr.h" |
46 | #include "acl.h" | |
47 | #include "namei.h" | |
717d50e4 | 48 | #include "group.h" |
ac27a0ec | 49 | |
9f6200bb TT |
50 | struct proc_dir_entry *ext4_proc_root; |
51 | ||
617ba13b | 52 | static int ext4_load_journal(struct super_block *, struct ext4_super_block *, |
ac27a0ec | 53 | unsigned long journal_devnum); |
c4be0c1d | 54 | static int ext4_commit_super(struct super_block *sb, |
2b2d6d01 TT |
55 | struct ext4_super_block *es, int sync); |
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); | |
617ba13b | 60 | static int ext4_sync_fs(struct super_block *sb, int wait); |
2b2d6d01 | 61 | static const char *ext4_decode_error(struct super_block *sb, int errno, |
ac27a0ec | 62 | char nbuf[16]); |
2b2d6d01 TT |
63 | static int ext4_remount(struct super_block *sb, int *flags, char *data); |
64 | static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf); | |
c4be0c1d | 65 | static int ext4_unfreeze(struct super_block *sb); |
2b2d6d01 | 66 | static void ext4_write_super(struct super_block *sb); |
c4be0c1d | 67 | static int ext4_freeze(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 | ||
560671a0 AK |
94 | __u32 ext4_free_blks_count(struct super_block *sb, |
95 | struct ext4_group_desc *bg) | |
96 | { | |
97 | return le16_to_cpu(bg->bg_free_blocks_count_lo) | | |
98 | (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? | |
99 | (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0); | |
100 | } | |
101 | ||
102 | __u32 ext4_free_inodes_count(struct super_block *sb, | |
103 | struct ext4_group_desc *bg) | |
104 | { | |
105 | return le16_to_cpu(bg->bg_free_inodes_count_lo) | | |
106 | (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? | |
107 | (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0); | |
108 | } | |
109 | ||
110 | __u32 ext4_used_dirs_count(struct super_block *sb, | |
111 | struct ext4_group_desc *bg) | |
112 | { | |
113 | return le16_to_cpu(bg->bg_used_dirs_count_lo) | | |
114 | (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? | |
115 | (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0); | |
116 | } | |
117 | ||
118 | __u32 ext4_itable_unused_count(struct super_block *sb, | |
119 | struct ext4_group_desc *bg) | |
120 | { | |
121 | return le16_to_cpu(bg->bg_itable_unused_lo) | | |
122 | (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? | |
123 | (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0); | |
124 | } | |
125 | ||
8fadc143 AR |
126 | void ext4_block_bitmap_set(struct super_block *sb, |
127 | struct ext4_group_desc *bg, ext4_fsblk_t blk) | |
bd81d8ee | 128 | { |
3a14589c | 129 | bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk); |
8fadc143 AR |
130 | if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) |
131 | bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32); | |
bd81d8ee LV |
132 | } |
133 | ||
8fadc143 AR |
134 | void ext4_inode_bitmap_set(struct super_block *sb, |
135 | struct ext4_group_desc *bg, ext4_fsblk_t blk) | |
bd81d8ee | 136 | { |
5272f837 | 137 | bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk); |
8fadc143 AR |
138 | if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) |
139 | bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32); | |
bd81d8ee LV |
140 | } |
141 | ||
8fadc143 AR |
142 | void ext4_inode_table_set(struct super_block *sb, |
143 | struct ext4_group_desc *bg, ext4_fsblk_t blk) | |
bd81d8ee | 144 | { |
5272f837 | 145 | bg->bg_inode_table_lo = cpu_to_le32((u32)blk); |
8fadc143 AR |
146 | if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) |
147 | bg->bg_inode_table_hi = cpu_to_le32(blk >> 32); | |
bd81d8ee LV |
148 | } |
149 | ||
560671a0 AK |
150 | void ext4_free_blks_set(struct super_block *sb, |
151 | struct ext4_group_desc *bg, __u32 count) | |
152 | { | |
153 | bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count); | |
154 | if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) | |
155 | bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16); | |
156 | } | |
157 | ||
158 | void ext4_free_inodes_set(struct super_block *sb, | |
159 | struct ext4_group_desc *bg, __u32 count) | |
160 | { | |
161 | bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count); | |
162 | if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) | |
163 | bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16); | |
164 | } | |
165 | ||
166 | void ext4_used_dirs_set(struct super_block *sb, | |
167 | struct ext4_group_desc *bg, __u32 count) | |
168 | { | |
169 | bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count); | |
170 | if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) | |
171 | bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16); | |
172 | } | |
173 | ||
174 | void ext4_itable_unused_set(struct super_block *sb, | |
175 | struct ext4_group_desc *bg, __u32 count) | |
176 | { | |
177 | bg->bg_itable_unused_lo = cpu_to_le16((__u16)count); | |
178 | if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) | |
179 | bg->bg_itable_unused_hi = cpu_to_le16(count >> 16); | |
180 | } | |
181 | ||
ac27a0ec | 182 | /* |
dab291af | 183 | * Wrappers for jbd2_journal_start/end. |
ac27a0ec DK |
184 | * |
185 | * The only special thing we need to do here is to make sure that all | |
186 | * journal_end calls result in the superblock being marked dirty, so | |
187 | * that sync() will call the filesystem's write_super callback if | |
188 | * appropriate. | |
189 | */ | |
617ba13b | 190 | handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks) |
ac27a0ec DK |
191 | { |
192 | journal_t *journal; | |
193 | ||
194 | if (sb->s_flags & MS_RDONLY) | |
195 | return ERR_PTR(-EROFS); | |
196 | ||
197 | /* Special case here: if the journal has aborted behind our | |
198 | * backs (eg. EIO in the commit thread), then we still need to | |
199 | * take the FS itself readonly cleanly. */ | |
617ba13b | 200 | journal = EXT4_SB(sb)->s_journal; |
0390131b FM |
201 | if (journal) { |
202 | if (is_journal_aborted(journal)) { | |
203 | ext4_abort(sb, __func__, | |
204 | "Detected aborted journal"); | |
205 | return ERR_PTR(-EROFS); | |
206 | } | |
207 | return jbd2_journal_start(journal, nblocks); | |
ac27a0ec | 208 | } |
0390131b FM |
209 | /* |
210 | * We're not journaling, return the appropriate indication. | |
211 | */ | |
212 | current->journal_info = EXT4_NOJOURNAL_HANDLE; | |
213 | return current->journal_info; | |
ac27a0ec DK |
214 | } |
215 | ||
216 | /* | |
217 | * The only special thing we need to do here is to make sure that all | |
dab291af | 218 | * jbd2_journal_stop calls result in the superblock being marked dirty, so |
ac27a0ec DK |
219 | * that sync() will call the filesystem's write_super callback if |
220 | * appropriate. | |
221 | */ | |
617ba13b | 222 | int __ext4_journal_stop(const char *where, handle_t *handle) |
ac27a0ec DK |
223 | { |
224 | struct super_block *sb; | |
225 | int err; | |
226 | int rc; | |
227 | ||
0390131b FM |
228 | if (!ext4_handle_valid(handle)) { |
229 | /* | |
230 | * Do this here since we don't call jbd2_journal_stop() in | |
231 | * no-journal mode. | |
232 | */ | |
233 | current->journal_info = NULL; | |
234 | return 0; | |
235 | } | |
ac27a0ec DK |
236 | sb = handle->h_transaction->t_journal->j_private; |
237 | err = handle->h_err; | |
dab291af | 238 | rc = jbd2_journal_stop(handle); |
ac27a0ec DK |
239 | |
240 | if (!err) | |
241 | err = rc; | |
242 | if (err) | |
617ba13b | 243 | __ext4_std_error(sb, where, err); |
ac27a0ec DK |
244 | return err; |
245 | } | |
246 | ||
617ba13b | 247 | void ext4_journal_abort_handle(const char *caller, const char *err_fn, |
ac27a0ec DK |
248 | struct buffer_head *bh, handle_t *handle, int err) |
249 | { | |
250 | char nbuf[16]; | |
617ba13b | 251 | const char *errstr = ext4_decode_error(NULL, err, nbuf); |
ac27a0ec | 252 | |
0390131b FM |
253 | BUG_ON(!ext4_handle_valid(handle)); |
254 | ||
ac27a0ec DK |
255 | if (bh) |
256 | BUFFER_TRACE(bh, "abort"); | |
257 | ||
258 | if (!handle->h_err) | |
259 | handle->h_err = err; | |
260 | ||
261 | if (is_handle_aborted(handle)) | |
262 | return; | |
263 | ||
264 | printk(KERN_ERR "%s: aborting transaction: %s in %s\n", | |
265 | caller, errstr, err_fn); | |
266 | ||
dab291af | 267 | jbd2_journal_abort_handle(handle); |
ac27a0ec DK |
268 | } |
269 | ||
270 | /* Deal with the reporting of failure conditions on a filesystem such as | |
271 | * inconsistencies detected or read IO failures. | |
272 | * | |
273 | * On ext2, we can store the error state of the filesystem in the | |
617ba13b | 274 | * superblock. That is not possible on ext4, because we may have other |
ac27a0ec DK |
275 | * write ordering constraints on the superblock which prevent us from |
276 | * writing it out straight away; and given that the journal is about to | |
277 | * be aborted, we can't rely on the current, or future, transactions to | |
278 | * write out the superblock safely. | |
279 | * | |
dab291af | 280 | * We'll just use the jbd2_journal_abort() error code to record an error in |
ac27a0ec DK |
281 | * the journal instead. On recovery, the journal will compain about |
282 | * that error until we've noted it down and cleared it. | |
283 | */ | |
284 | ||
617ba13b | 285 | static void ext4_handle_error(struct super_block *sb) |
ac27a0ec | 286 | { |
617ba13b | 287 | struct ext4_super_block *es = EXT4_SB(sb)->s_es; |
ac27a0ec | 288 | |
617ba13b MC |
289 | EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; |
290 | es->s_state |= cpu_to_le16(EXT4_ERROR_FS); | |
ac27a0ec DK |
291 | |
292 | if (sb->s_flags & MS_RDONLY) | |
293 | return; | |
294 | ||
2b2d6d01 | 295 | if (!test_opt(sb, ERRORS_CONT)) { |
617ba13b | 296 | journal_t *journal = EXT4_SB(sb)->s_journal; |
ac27a0ec | 297 | |
617ba13b | 298 | EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT; |
ac27a0ec | 299 | if (journal) |
dab291af | 300 | jbd2_journal_abort(journal, -EIO); |
ac27a0ec | 301 | } |
2b2d6d01 TT |
302 | if (test_opt(sb, ERRORS_RO)) { |
303 | printk(KERN_CRIT "Remounting filesystem read-only\n"); | |
ac27a0ec DK |
304 | sb->s_flags |= MS_RDONLY; |
305 | } | |
617ba13b | 306 | ext4_commit_super(sb, es, 1); |
ac27a0ec | 307 | if (test_opt(sb, ERRORS_PANIC)) |
617ba13b | 308 | panic("EXT4-fs (device %s): panic forced after error\n", |
ac27a0ec DK |
309 | sb->s_id); |
310 | } | |
311 | ||
2b2d6d01 TT |
312 | void ext4_error(struct super_block *sb, const char *function, |
313 | const char *fmt, ...) | |
ac27a0ec DK |
314 | { |
315 | va_list args; | |
316 | ||
317 | va_start(args, fmt); | |
2b2d6d01 | 318 | printk(KERN_CRIT "EXT4-fs error (device %s): %s: ", sb->s_id, function); |
ac27a0ec DK |
319 | vprintk(fmt, args); |
320 | printk("\n"); | |
321 | va_end(args); | |
322 | ||
617ba13b | 323 | ext4_handle_error(sb); |
ac27a0ec DK |
324 | } |
325 | ||
2b2d6d01 | 326 | static const char *ext4_decode_error(struct super_block *sb, int errno, |
ac27a0ec DK |
327 | char nbuf[16]) |
328 | { | |
329 | char *errstr = NULL; | |
330 | ||
331 | switch (errno) { | |
332 | case -EIO: | |
333 | errstr = "IO failure"; | |
334 | break; | |
335 | case -ENOMEM: | |
336 | errstr = "Out of memory"; | |
337 | break; | |
338 | case -EROFS: | |
dab291af | 339 | if (!sb || EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT) |
ac27a0ec DK |
340 | errstr = "Journal has aborted"; |
341 | else | |
342 | errstr = "Readonly filesystem"; | |
343 | break; | |
344 | default: | |
345 | /* If the caller passed in an extra buffer for unknown | |
346 | * errors, textualise them now. Else we just return | |
347 | * NULL. */ | |
348 | if (nbuf) { | |
349 | /* Check for truncated error codes... */ | |
350 | if (snprintf(nbuf, 16, "error %d", -errno) >= 0) | |
351 | errstr = nbuf; | |
352 | } | |
353 | break; | |
354 | } | |
355 | ||
356 | return errstr; | |
357 | } | |
358 | ||
617ba13b | 359 | /* __ext4_std_error decodes expected errors from journaling functions |
ac27a0ec DK |
360 | * automatically and invokes the appropriate error response. */ |
361 | ||
2b2d6d01 | 362 | void __ext4_std_error(struct super_block *sb, const char *function, int errno) |
ac27a0ec DK |
363 | { |
364 | char nbuf[16]; | |
365 | const char *errstr; | |
366 | ||
367 | /* Special case: if the error is EROFS, and we're not already | |
368 | * inside a transaction, then there's really no point in logging | |
369 | * an error. */ | |
370 | if (errno == -EROFS && journal_current_handle() == NULL && | |
371 | (sb->s_flags & MS_RDONLY)) | |
372 | return; | |
373 | ||
617ba13b | 374 | errstr = ext4_decode_error(sb, errno, nbuf); |
2b2d6d01 TT |
375 | printk(KERN_CRIT "EXT4-fs error (device %s) in %s: %s\n", |
376 | sb->s_id, function, errstr); | |
ac27a0ec | 377 | |
617ba13b | 378 | ext4_handle_error(sb); |
ac27a0ec DK |
379 | } |
380 | ||
381 | /* | |
617ba13b | 382 | * ext4_abort is a much stronger failure handler than ext4_error. The |
ac27a0ec DK |
383 | * abort function may be used to deal with unrecoverable failures such |
384 | * as journal IO errors or ENOMEM at a critical moment in log management. | |
385 | * | |
386 | * We unconditionally force the filesystem into an ABORT|READONLY state, | |
387 | * unless the error response on the fs has been set to panic in which | |
388 | * case we take the easy way out and panic immediately. | |
389 | */ | |
390 | ||
2b2d6d01 TT |
391 | void ext4_abort(struct super_block *sb, const char *function, |
392 | const char *fmt, ...) | |
ac27a0ec DK |
393 | { |
394 | va_list args; | |
395 | ||
2b2d6d01 | 396 | printk(KERN_CRIT "ext4_abort called.\n"); |
ac27a0ec DK |
397 | |
398 | va_start(args, fmt); | |
2b2d6d01 | 399 | printk(KERN_CRIT "EXT4-fs error (device %s): %s: ", sb->s_id, function); |
ac27a0ec DK |
400 | vprintk(fmt, args); |
401 | printk("\n"); | |
402 | va_end(args); | |
403 | ||
404 | if (test_opt(sb, ERRORS_PANIC)) | |
617ba13b | 405 | panic("EXT4-fs panic from previous error\n"); |
ac27a0ec DK |
406 | |
407 | if (sb->s_flags & MS_RDONLY) | |
408 | return; | |
409 | ||
410 | printk(KERN_CRIT "Remounting filesystem read-only\n"); | |
617ba13b | 411 | EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; |
ac27a0ec | 412 | sb->s_flags |= MS_RDONLY; |
617ba13b | 413 | EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT; |
ef2cabf7 HK |
414 | if (EXT4_SB(sb)->s_journal) |
415 | jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO); | |
ac27a0ec DK |
416 | } |
417 | ||
2b2d6d01 TT |
418 | void ext4_warning(struct super_block *sb, const char *function, |
419 | const char *fmt, ...) | |
ac27a0ec DK |
420 | { |
421 | va_list args; | |
422 | ||
423 | va_start(args, fmt); | |
617ba13b | 424 | printk(KERN_WARNING "EXT4-fs warning (device %s): %s: ", |
ac27a0ec DK |
425 | sb->s_id, function); |
426 | vprintk(fmt, args); | |
427 | printk("\n"); | |
428 | va_end(args); | |
429 | } | |
430 | ||
5d1b1b3f AK |
431 | void ext4_grp_locked_error(struct super_block *sb, ext4_group_t grp, |
432 | const char *function, const char *fmt, ...) | |
433 | __releases(bitlock) | |
434 | __acquires(bitlock) | |
435 | { | |
436 | va_list args; | |
437 | struct ext4_super_block *es = EXT4_SB(sb)->s_es; | |
438 | ||
439 | va_start(args, fmt); | |
440 | printk(KERN_CRIT "EXT4-fs error (device %s): %s: ", sb->s_id, function); | |
441 | vprintk(fmt, args); | |
442 | printk("\n"); | |
443 | va_end(args); | |
444 | ||
445 | if (test_opt(sb, ERRORS_CONT)) { | |
446 | EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; | |
447 | es->s_state |= cpu_to_le16(EXT4_ERROR_FS); | |
448 | ext4_commit_super(sb, es, 0); | |
449 | return; | |
450 | } | |
451 | ext4_unlock_group(sb, grp); | |
452 | ext4_handle_error(sb); | |
453 | /* | |
454 | * We only get here in the ERRORS_RO case; relocking the group | |
455 | * may be dangerous, but nothing bad will happen since the | |
456 | * filesystem will have already been marked read/only and the | |
457 | * journal has been aborted. We return 1 as a hint to callers | |
458 | * who might what to use the return value from | |
459 | * ext4_grp_locked_error() to distinguish beween the | |
460 | * ERRORS_CONT and ERRORS_RO case, and perhaps return more | |
461 | * aggressively from the ext4 function in question, with a | |
462 | * more appropriate error code. | |
463 | */ | |
464 | ext4_lock_group(sb, grp); | |
465 | return; | |
466 | } | |
467 | ||
468 | ||
617ba13b | 469 | void ext4_update_dynamic_rev(struct super_block *sb) |
ac27a0ec | 470 | { |
617ba13b | 471 | struct ext4_super_block *es = EXT4_SB(sb)->s_es; |
ac27a0ec | 472 | |
617ba13b | 473 | if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV) |
ac27a0ec DK |
474 | return; |
475 | ||
46e665e9 | 476 | ext4_warning(sb, __func__, |
ac27a0ec DK |
477 | "updating to rev %d because of new feature flag, " |
478 | "running e2fsck is recommended", | |
617ba13b | 479 | EXT4_DYNAMIC_REV); |
ac27a0ec | 480 | |
617ba13b MC |
481 | es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO); |
482 | es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE); | |
483 | es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV); | |
ac27a0ec DK |
484 | /* leave es->s_feature_*compat flags alone */ |
485 | /* es->s_uuid will be set by e2fsck if empty */ | |
486 | ||
487 | /* | |
488 | * The rest of the superblock fields should be zero, and if not it | |
489 | * means they are likely already in use, so leave them alone. We | |
490 | * can leave it up to e2fsck to clean up any inconsistencies there. | |
491 | */ | |
492 | } | |
493 | ||
494 | /* | |
495 | * Open the external journal device | |
496 | */ | |
617ba13b | 497 | static struct block_device *ext4_blkdev_get(dev_t dev) |
ac27a0ec DK |
498 | { |
499 | struct block_device *bdev; | |
500 | char b[BDEVNAME_SIZE]; | |
501 | ||
502 | bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE); | |
503 | if (IS_ERR(bdev)) | |
504 | goto fail; | |
505 | return bdev; | |
506 | ||
507 | fail: | |
abda1418 | 508 | printk(KERN_ERR "EXT4-fs: failed to open journal device %s: %ld\n", |
ac27a0ec DK |
509 | __bdevname(dev, b), PTR_ERR(bdev)); |
510 | return NULL; | |
511 | } | |
512 | ||
513 | /* | |
514 | * Release the journal device | |
515 | */ | |
617ba13b | 516 | static int ext4_blkdev_put(struct block_device *bdev) |
ac27a0ec DK |
517 | { |
518 | bd_release(bdev); | |
9a1c3542 | 519 | return blkdev_put(bdev, FMODE_READ|FMODE_WRITE); |
ac27a0ec DK |
520 | } |
521 | ||
617ba13b | 522 | static int ext4_blkdev_remove(struct ext4_sb_info *sbi) |
ac27a0ec DK |
523 | { |
524 | struct block_device *bdev; | |
525 | int ret = -ENODEV; | |
526 | ||
527 | bdev = sbi->journal_bdev; | |
528 | if (bdev) { | |
617ba13b | 529 | ret = ext4_blkdev_put(bdev); |
ac27a0ec DK |
530 | sbi->journal_bdev = NULL; |
531 | } | |
532 | return ret; | |
533 | } | |
534 | ||
535 | static inline struct inode *orphan_list_entry(struct list_head *l) | |
536 | { | |
617ba13b | 537 | return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode; |
ac27a0ec DK |
538 | } |
539 | ||
617ba13b | 540 | static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi) |
ac27a0ec DK |
541 | { |
542 | struct list_head *l; | |
543 | ||
544 | printk(KERN_ERR "sb orphan head is %d\n", | |
545 | le32_to_cpu(sbi->s_es->s_last_orphan)); | |
546 | ||
547 | printk(KERN_ERR "sb_info orphan list:\n"); | |
548 | list_for_each(l, &sbi->s_orphan) { | |
549 | struct inode *inode = orphan_list_entry(l); | |
550 | printk(KERN_ERR " " | |
551 | "inode %s:%lu at %p: mode %o, nlink %d, next %d\n", | |
552 | inode->i_sb->s_id, inode->i_ino, inode, | |
553 | inode->i_mode, inode->i_nlink, | |
554 | NEXT_ORPHAN(inode)); | |
555 | } | |
556 | } | |
557 | ||
2b2d6d01 | 558 | static void ext4_put_super(struct super_block *sb) |
ac27a0ec | 559 | { |
617ba13b MC |
560 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
561 | struct ext4_super_block *es = sbi->s_es; | |
ef2cabf7 | 562 | int i, err; |
ac27a0ec | 563 | |
c9de560d | 564 | ext4_mb_release(sb); |
a86c6181 | 565 | ext4_ext_release(sb); |
617ba13b | 566 | ext4_xattr_put_super(sb); |
0390131b FM |
567 | if (sbi->s_journal) { |
568 | err = jbd2_journal_destroy(sbi->s_journal); | |
569 | sbi->s_journal = NULL; | |
570 | if (err < 0) | |
571 | ext4_abort(sb, __func__, | |
572 | "Couldn't clean up the journal"); | |
573 | } | |
ac27a0ec | 574 | if (!(sb->s_flags & MS_RDONLY)) { |
617ba13b | 575 | EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); |
ac27a0ec | 576 | es->s_state = cpu_to_le16(sbi->s_mount_state); |
617ba13b | 577 | ext4_commit_super(sb, es, 1); |
ac27a0ec | 578 | } |
240799cd TT |
579 | if (sbi->s_proc) { |
580 | remove_proc_entry("inode_readahead_blks", sbi->s_proc); | |
9f6200bb | 581 | remove_proc_entry(sb->s_id, ext4_proc_root); |
240799cd | 582 | } |
ac27a0ec DK |
583 | |
584 | for (i = 0; i < sbi->s_gdb_count; i++) | |
585 | brelse(sbi->s_group_desc[i]); | |
586 | kfree(sbi->s_group_desc); | |
772cb7c8 | 587 | kfree(sbi->s_flex_groups); |
ac27a0ec DK |
588 | percpu_counter_destroy(&sbi->s_freeblocks_counter); |
589 | percpu_counter_destroy(&sbi->s_freeinodes_counter); | |
590 | percpu_counter_destroy(&sbi->s_dirs_counter); | |
6bc6e63f | 591 | percpu_counter_destroy(&sbi->s_dirtyblocks_counter); |
ac27a0ec DK |
592 | brelse(sbi->s_sbh); |
593 | #ifdef CONFIG_QUOTA | |
594 | for (i = 0; i < MAXQUOTAS; i++) | |
595 | kfree(sbi->s_qf_names[i]); | |
596 | #endif | |
597 | ||
598 | /* Debugging code just in case the in-memory inode orphan list | |
599 | * isn't empty. The on-disk one can be non-empty if we've | |
600 | * detected an error and taken the fs readonly, but the | |
601 | * in-memory list had better be clean by this point. */ | |
602 | if (!list_empty(&sbi->s_orphan)) | |
603 | dump_orphan_list(sb, sbi); | |
604 | J_ASSERT(list_empty(&sbi->s_orphan)); | |
605 | ||
f98393a6 | 606 | invalidate_bdev(sb->s_bdev); |
ac27a0ec DK |
607 | if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) { |
608 | /* | |
609 | * Invalidate the journal device's buffers. We don't want them | |
610 | * floating about in memory - the physical journal device may | |
611 | * hotswapped, and it breaks the `ro-after' testing code. | |
612 | */ | |
613 | sync_blockdev(sbi->journal_bdev); | |
f98393a6 | 614 | invalidate_bdev(sbi->journal_bdev); |
617ba13b | 615 | ext4_blkdev_remove(sbi); |
ac27a0ec DK |
616 | } |
617 | sb->s_fs_info = NULL; | |
705895b6 | 618 | kfree(sbi->s_blockgroup_lock); |
ac27a0ec DK |
619 | kfree(sbi); |
620 | return; | |
621 | } | |
622 | ||
e18b890b | 623 | static struct kmem_cache *ext4_inode_cachep; |
ac27a0ec DK |
624 | |
625 | /* | |
626 | * Called inside transaction, so use GFP_NOFS | |
627 | */ | |
617ba13b | 628 | static struct inode *ext4_alloc_inode(struct super_block *sb) |
ac27a0ec | 629 | { |
617ba13b | 630 | struct ext4_inode_info *ei; |
ac27a0ec | 631 | |
e6b4f8da | 632 | ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS); |
ac27a0ec DK |
633 | if (!ei) |
634 | return NULL; | |
03010a33 | 635 | #ifdef CONFIG_EXT4_FS_POSIX_ACL |
617ba13b MC |
636 | ei->i_acl = EXT4_ACL_NOT_CACHED; |
637 | ei->i_default_acl = EXT4_ACL_NOT_CACHED; | |
ac27a0ec | 638 | #endif |
ac27a0ec | 639 | ei->vfs_inode.i_version = 1; |
91246c00 | 640 | ei->vfs_inode.i_data.writeback_index = 0; |
a86c6181 | 641 | memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache)); |
c9de560d AT |
642 | INIT_LIST_HEAD(&ei->i_prealloc_list); |
643 | spin_lock_init(&ei->i_prealloc_lock); | |
0390131b FM |
644 | /* |
645 | * Note: We can be called before EXT4_SB(sb)->s_journal is set, | |
646 | * therefore it can be null here. Don't check it, just initialize | |
647 | * jinode. | |
648 | */ | |
678aaf48 | 649 | jbd2_journal_init_jbd_inode(&ei->jinode, &ei->vfs_inode); |
d2a17637 MC |
650 | ei->i_reserved_data_blocks = 0; |
651 | ei->i_reserved_meta_blocks = 0; | |
652 | ei->i_allocated_meta_blocks = 0; | |
653 | ei->i_delalloc_reserved_flag = 0; | |
654 | spin_lock_init(&(ei->i_block_reservation_lock)); | |
ac27a0ec DK |
655 | return &ei->vfs_inode; |
656 | } | |
657 | ||
617ba13b | 658 | static void ext4_destroy_inode(struct inode *inode) |
ac27a0ec | 659 | { |
9f7dd93d VA |
660 | if (!list_empty(&(EXT4_I(inode)->i_orphan))) { |
661 | printk("EXT4 Inode %p: orphan list check failed!\n", | |
662 | EXT4_I(inode)); | |
663 | print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4, | |
664 | EXT4_I(inode), sizeof(struct ext4_inode_info), | |
665 | true); | |
666 | dump_stack(); | |
667 | } | |
617ba13b | 668 | kmem_cache_free(ext4_inode_cachep, EXT4_I(inode)); |
ac27a0ec DK |
669 | } |
670 | ||
51cc5068 | 671 | static void init_once(void *foo) |
ac27a0ec | 672 | { |
617ba13b | 673 | struct ext4_inode_info *ei = (struct ext4_inode_info *) foo; |
ac27a0ec | 674 | |
a35afb83 | 675 | INIT_LIST_HEAD(&ei->i_orphan); |
03010a33 | 676 | #ifdef CONFIG_EXT4_FS_XATTR |
a35afb83 | 677 | init_rwsem(&ei->xattr_sem); |
ac27a0ec | 678 | #endif |
0e855ac8 | 679 | init_rwsem(&ei->i_data_sem); |
a35afb83 | 680 | inode_init_once(&ei->vfs_inode); |
ac27a0ec DK |
681 | } |
682 | ||
683 | static int init_inodecache(void) | |
684 | { | |
617ba13b MC |
685 | ext4_inode_cachep = kmem_cache_create("ext4_inode_cache", |
686 | sizeof(struct ext4_inode_info), | |
ac27a0ec DK |
687 | 0, (SLAB_RECLAIM_ACCOUNT| |
688 | SLAB_MEM_SPREAD), | |
20c2df83 | 689 | init_once); |
617ba13b | 690 | if (ext4_inode_cachep == NULL) |
ac27a0ec DK |
691 | return -ENOMEM; |
692 | return 0; | |
693 | } | |
694 | ||
695 | static void destroy_inodecache(void) | |
696 | { | |
617ba13b | 697 | kmem_cache_destroy(ext4_inode_cachep); |
ac27a0ec DK |
698 | } |
699 | ||
617ba13b | 700 | static void ext4_clear_inode(struct inode *inode) |
ac27a0ec | 701 | { |
03010a33 | 702 | #ifdef CONFIG_EXT4_FS_POSIX_ACL |
617ba13b MC |
703 | if (EXT4_I(inode)->i_acl && |
704 | EXT4_I(inode)->i_acl != EXT4_ACL_NOT_CACHED) { | |
705 | posix_acl_release(EXT4_I(inode)->i_acl); | |
706 | EXT4_I(inode)->i_acl = EXT4_ACL_NOT_CACHED; | |
707 | } | |
708 | if (EXT4_I(inode)->i_default_acl && | |
709 | EXT4_I(inode)->i_default_acl != EXT4_ACL_NOT_CACHED) { | |
710 | posix_acl_release(EXT4_I(inode)->i_default_acl); | |
711 | EXT4_I(inode)->i_default_acl = EXT4_ACL_NOT_CACHED; | |
ac27a0ec DK |
712 | } |
713 | #endif | |
c2ea3fde | 714 | ext4_discard_preallocations(inode); |
0390131b FM |
715 | if (EXT4_JOURNAL(inode)) |
716 | jbd2_journal_release_jbd_inode(EXT4_SB(inode->i_sb)->s_journal, | |
678aaf48 | 717 | &EXT4_I(inode)->jinode); |
ac27a0ec DK |
718 | } |
719 | ||
2b2d6d01 TT |
720 | static inline void ext4_show_quota_options(struct seq_file *seq, |
721 | struct super_block *sb) | |
ac27a0ec DK |
722 | { |
723 | #if defined(CONFIG_QUOTA) | |
617ba13b | 724 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
ac27a0ec DK |
725 | |
726 | if (sbi->s_jquota_fmt) | |
727 | seq_printf(seq, ",jqfmt=%s", | |
af5bc92d | 728 | (sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold" : "vfsv0"); |
ac27a0ec DK |
729 | |
730 | if (sbi->s_qf_names[USRQUOTA]) | |
731 | seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]); | |
732 | ||
733 | if (sbi->s_qf_names[GRPQUOTA]) | |
734 | seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]); | |
735 | ||
617ba13b | 736 | if (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA) |
ac27a0ec DK |
737 | seq_puts(seq, ",usrquota"); |
738 | ||
617ba13b | 739 | if (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA) |
ac27a0ec DK |
740 | seq_puts(seq, ",grpquota"); |
741 | #endif | |
742 | } | |
743 | ||
d9c9bef1 MS |
744 | /* |
745 | * Show an option if | |
746 | * - it's set to a non-default value OR | |
747 | * - if the per-sb default is different from the global default | |
748 | */ | |
617ba13b | 749 | static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs) |
ac27a0ec | 750 | { |
aa22df2c AK |
751 | int def_errors; |
752 | unsigned long def_mount_opts; | |
ac27a0ec | 753 | struct super_block *sb = vfs->mnt_sb; |
d9c9bef1 MS |
754 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
755 | struct ext4_super_block *es = sbi->s_es; | |
d9c9bef1 MS |
756 | |
757 | def_mount_opts = le32_to_cpu(es->s_default_mount_opts); | |
aa22df2c | 758 | def_errors = le16_to_cpu(es->s_errors); |
d9c9bef1 MS |
759 | |
760 | if (sbi->s_sb_block != 1) | |
761 | seq_printf(seq, ",sb=%llu", sbi->s_sb_block); | |
762 | if (test_opt(sb, MINIX_DF)) | |
763 | seq_puts(seq, ",minixdf"); | |
aa22df2c | 764 | if (test_opt(sb, GRPID) && !(def_mount_opts & EXT4_DEFM_BSDGROUPS)) |
d9c9bef1 MS |
765 | seq_puts(seq, ",grpid"); |
766 | if (!test_opt(sb, GRPID) && (def_mount_opts & EXT4_DEFM_BSDGROUPS)) | |
767 | seq_puts(seq, ",nogrpid"); | |
768 | if (sbi->s_resuid != EXT4_DEF_RESUID || | |
769 | le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID) { | |
770 | seq_printf(seq, ",resuid=%u", sbi->s_resuid); | |
771 | } | |
772 | if (sbi->s_resgid != EXT4_DEF_RESGID || | |
773 | le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID) { | |
774 | seq_printf(seq, ",resgid=%u", sbi->s_resgid); | |
775 | } | |
bb4f397a | 776 | if (test_opt(sb, ERRORS_RO)) { |
d9c9bef1 | 777 | if (def_errors == EXT4_ERRORS_PANIC || |
bb4f397a AK |
778 | def_errors == EXT4_ERRORS_CONTINUE) { |
779 | seq_puts(seq, ",errors=remount-ro"); | |
d9c9bef1 MS |
780 | } |
781 | } | |
aa22df2c | 782 | if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE) |
bb4f397a | 783 | seq_puts(seq, ",errors=continue"); |
aa22df2c | 784 | if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC) |
d9c9bef1 | 785 | seq_puts(seq, ",errors=panic"); |
aa22df2c | 786 | if (test_opt(sb, NO_UID32) && !(def_mount_opts & EXT4_DEFM_UID16)) |
d9c9bef1 | 787 | seq_puts(seq, ",nouid32"); |
aa22df2c | 788 | if (test_opt(sb, DEBUG) && !(def_mount_opts & EXT4_DEFM_DEBUG)) |
d9c9bef1 MS |
789 | seq_puts(seq, ",debug"); |
790 | if (test_opt(sb, OLDALLOC)) | |
791 | seq_puts(seq, ",oldalloc"); | |
03010a33 | 792 | #ifdef CONFIG_EXT4_FS_XATTR |
aa22df2c AK |
793 | if (test_opt(sb, XATTR_USER) && |
794 | !(def_mount_opts & EXT4_DEFM_XATTR_USER)) | |
d9c9bef1 MS |
795 | seq_puts(seq, ",user_xattr"); |
796 | if (!test_opt(sb, XATTR_USER) && | |
797 | (def_mount_opts & EXT4_DEFM_XATTR_USER)) { | |
798 | seq_puts(seq, ",nouser_xattr"); | |
799 | } | |
800 | #endif | |
03010a33 | 801 | #ifdef CONFIG_EXT4_FS_POSIX_ACL |
aa22df2c | 802 | if (test_opt(sb, POSIX_ACL) && !(def_mount_opts & EXT4_DEFM_ACL)) |
d9c9bef1 MS |
803 | seq_puts(seq, ",acl"); |
804 | if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT4_DEFM_ACL)) | |
805 | seq_puts(seq, ",noacl"); | |
806 | #endif | |
807 | if (!test_opt(sb, RESERVATION)) | |
808 | seq_puts(seq, ",noreservation"); | |
30773840 | 809 | if (sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) { |
d9c9bef1 MS |
810 | seq_printf(seq, ",commit=%u", |
811 | (unsigned) (sbi->s_commit_interval / HZ)); | |
812 | } | |
30773840 TT |
813 | if (sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME) { |
814 | seq_printf(seq, ",min_batch_time=%u", | |
815 | (unsigned) sbi->s_min_batch_time); | |
816 | } | |
817 | if (sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME) { | |
818 | seq_printf(seq, ",max_batch_time=%u", | |
819 | (unsigned) sbi->s_min_batch_time); | |
820 | } | |
821 | ||
571640ca ES |
822 | /* |
823 | * We're changing the default of barrier mount option, so | |
824 | * let's always display its mount state so it's clear what its | |
825 | * status is. | |
826 | */ | |
827 | seq_puts(seq, ",barrier="); | |
828 | seq_puts(seq, test_opt(sb, BARRIER) ? "1" : "0"); | |
cd0b6a39 TT |
829 | if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) |
830 | seq_puts(seq, ",journal_async_commit"); | |
d9c9bef1 MS |
831 | if (test_opt(sb, NOBH)) |
832 | seq_puts(seq, ",nobh"); | |
25ec56b5 JNC |
833 | if (test_opt(sb, I_VERSION)) |
834 | seq_puts(seq, ",i_version"); | |
dd919b98 AK |
835 | if (!test_opt(sb, DELALLOC)) |
836 | seq_puts(seq, ",nodelalloc"); | |
837 | ||
ac27a0ec | 838 | |
cb45bbe4 MS |
839 | if (sbi->s_stripe) |
840 | seq_printf(seq, ",stripe=%lu", sbi->s_stripe); | |
aa22df2c AK |
841 | /* |
842 | * journal mode get enabled in different ways | |
843 | * So just print the value even if we didn't specify it | |
844 | */ | |
617ba13b | 845 | if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) |
ac27a0ec | 846 | seq_puts(seq, ",data=journal"); |
617ba13b | 847 | else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) |
ac27a0ec | 848 | seq_puts(seq, ",data=ordered"); |
617ba13b | 849 | else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA) |
ac27a0ec DK |
850 | seq_puts(seq, ",data=writeback"); |
851 | ||
240799cd TT |
852 | if (sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS) |
853 | seq_printf(seq, ",inode_readahead_blks=%u", | |
854 | sbi->s_inode_readahead_blks); | |
855 | ||
5bf5683a HK |
856 | if (test_opt(sb, DATA_ERR_ABORT)) |
857 | seq_puts(seq, ",data_err=abort"); | |
858 | ||
617ba13b | 859 | ext4_show_quota_options(seq, sb); |
ac27a0ec DK |
860 | return 0; |
861 | } | |
862 | ||
863 | ||
1b961ac0 CH |
864 | static struct inode *ext4_nfs_get_inode(struct super_block *sb, |
865 | u64 ino, u32 generation) | |
ac27a0ec | 866 | { |
ac27a0ec | 867 | struct inode *inode; |
ac27a0ec | 868 | |
617ba13b | 869 | if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO) |
ac27a0ec | 870 | return ERR_PTR(-ESTALE); |
617ba13b | 871 | if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)) |
ac27a0ec DK |
872 | return ERR_PTR(-ESTALE); |
873 | ||
874 | /* iget isn't really right if the inode is currently unallocated!! | |
875 | * | |
617ba13b | 876 | * ext4_read_inode will return a bad_inode if the inode had been |
ac27a0ec DK |
877 | * deleted, so we should be safe. |
878 | * | |
879 | * Currently we don't know the generation for parent directory, so | |
880 | * a generation of 0 means "accept any" | |
881 | */ | |
1d1fe1ee DH |
882 | inode = ext4_iget(sb, ino); |
883 | if (IS_ERR(inode)) | |
884 | return ERR_CAST(inode); | |
885 | if (generation && inode->i_generation != generation) { | |
ac27a0ec DK |
886 | iput(inode); |
887 | return ERR_PTR(-ESTALE); | |
888 | } | |
1b961ac0 CH |
889 | |
890 | return inode; | |
891 | } | |
892 | ||
893 | static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid, | |
894 | int fh_len, int fh_type) | |
895 | { | |
896 | return generic_fh_to_dentry(sb, fid, fh_len, fh_type, | |
897 | ext4_nfs_get_inode); | |
898 | } | |
899 | ||
900 | static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid, | |
901 | int fh_len, int fh_type) | |
902 | { | |
903 | return generic_fh_to_parent(sb, fid, fh_len, fh_type, | |
904 | ext4_nfs_get_inode); | |
ac27a0ec DK |
905 | } |
906 | ||
c39a7f84 TO |
907 | /* |
908 | * Try to release metadata pages (indirect blocks, directories) which are | |
909 | * mapped via the block device. Since these pages could have journal heads | |
910 | * which would prevent try_to_free_buffers() from freeing them, we must use | |
911 | * jbd2 layer's try_to_free_buffers() function to release them. | |
912 | */ | |
913 | static int bdev_try_to_free_page(struct super_block *sb, struct page *page, gfp_t wait) | |
914 | { | |
915 | journal_t *journal = EXT4_SB(sb)->s_journal; | |
916 | ||
917 | WARN_ON(PageChecked(page)); | |
918 | if (!page_has_buffers(page)) | |
919 | return 0; | |
920 | if (journal) | |
921 | return jbd2_journal_try_to_free_buffers(journal, page, | |
922 | wait & ~__GFP_WAIT); | |
923 | return try_to_free_buffers(page); | |
924 | } | |
925 | ||
ac27a0ec | 926 | #ifdef CONFIG_QUOTA |
af5bc92d | 927 | #define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group") |
2b2d6d01 | 928 | #define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA)) |
ac27a0ec | 929 | |
617ba13b MC |
930 | static int ext4_write_dquot(struct dquot *dquot); |
931 | static int ext4_acquire_dquot(struct dquot *dquot); | |
932 | static int ext4_release_dquot(struct dquot *dquot); | |
933 | static int ext4_mark_dquot_dirty(struct dquot *dquot); | |
934 | static int ext4_write_info(struct super_block *sb, int type); | |
6f28e087 JK |
935 | static int ext4_quota_on(struct super_block *sb, int type, int format_id, |
936 | char *path, int remount); | |
617ba13b MC |
937 | static int ext4_quota_on_mount(struct super_block *sb, int type); |
938 | static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data, | |
ac27a0ec | 939 | size_t len, loff_t off); |
617ba13b | 940 | static ssize_t ext4_quota_write(struct super_block *sb, int type, |
ac27a0ec DK |
941 | const char *data, size_t len, loff_t off); |
942 | ||
617ba13b | 943 | static struct dquot_operations ext4_quota_operations = { |
edf72453 JK |
944 | .initialize = dquot_initialize, |
945 | .drop = dquot_drop, | |
ac27a0ec | 946 | .alloc_space = dquot_alloc_space, |
60e58e0f MC |
947 | .reserve_space = dquot_reserve_space, |
948 | .claim_space = dquot_claim_space, | |
949 | .release_rsv = dquot_release_reserved_space, | |
950 | .get_reserved_space = ext4_get_reserved_space, | |
ac27a0ec DK |
951 | .alloc_inode = dquot_alloc_inode, |
952 | .free_space = dquot_free_space, | |
953 | .free_inode = dquot_free_inode, | |
954 | .transfer = dquot_transfer, | |
617ba13b MC |
955 | .write_dquot = ext4_write_dquot, |
956 | .acquire_dquot = ext4_acquire_dquot, | |
957 | .release_dquot = ext4_release_dquot, | |
958 | .mark_dirty = ext4_mark_dquot_dirty, | |
a5b5ee32 JK |
959 | .write_info = ext4_write_info, |
960 | .alloc_dquot = dquot_alloc, | |
961 | .destroy_dquot = dquot_destroy, | |
ac27a0ec DK |
962 | }; |
963 | ||
617ba13b MC |
964 | static struct quotactl_ops ext4_qctl_operations = { |
965 | .quota_on = ext4_quota_on, | |
ac27a0ec DK |
966 | .quota_off = vfs_quota_off, |
967 | .quota_sync = vfs_quota_sync, | |
968 | .get_info = vfs_get_dqinfo, | |
969 | .set_info = vfs_set_dqinfo, | |
970 | .get_dqblk = vfs_get_dqblk, | |
971 | .set_dqblk = vfs_set_dqblk | |
972 | }; | |
973 | #endif | |
974 | ||
ee9b6d61 | 975 | static const struct super_operations ext4_sops = { |
617ba13b MC |
976 | .alloc_inode = ext4_alloc_inode, |
977 | .destroy_inode = ext4_destroy_inode, | |
617ba13b MC |
978 | .write_inode = ext4_write_inode, |
979 | .dirty_inode = ext4_dirty_inode, | |
980 | .delete_inode = ext4_delete_inode, | |
981 | .put_super = ext4_put_super, | |
982 | .write_super = ext4_write_super, | |
983 | .sync_fs = ext4_sync_fs, | |
c4be0c1d TS |
984 | .freeze_fs = ext4_freeze, |
985 | .unfreeze_fs = ext4_unfreeze, | |
617ba13b MC |
986 | .statfs = ext4_statfs, |
987 | .remount_fs = ext4_remount, | |
988 | .clear_inode = ext4_clear_inode, | |
989 | .show_options = ext4_show_options, | |
ac27a0ec | 990 | #ifdef CONFIG_QUOTA |
617ba13b MC |
991 | .quota_read = ext4_quota_read, |
992 | .quota_write = ext4_quota_write, | |
ac27a0ec | 993 | #endif |
c39a7f84 | 994 | .bdev_try_to_free_page = bdev_try_to_free_page, |
ac27a0ec DK |
995 | }; |
996 | ||
39655164 | 997 | static const struct export_operations ext4_export_ops = { |
1b961ac0 CH |
998 | .fh_to_dentry = ext4_fh_to_dentry, |
999 | .fh_to_parent = ext4_fh_to_parent, | |
617ba13b | 1000 | .get_parent = ext4_get_parent, |
ac27a0ec DK |
1001 | }; |
1002 | ||
1003 | enum { | |
1004 | Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid, | |
1005 | Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro, | |
01436ef2 | 1006 | Opt_nouid32, Opt_debug, Opt_oldalloc, Opt_orlov, |
ac27a0ec DK |
1007 | Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl, |
1008 | Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh, | |
30773840 | 1009 | Opt_commit, Opt_min_batch_time, Opt_max_batch_time, |
c3191067 | 1010 | Opt_journal_update, Opt_journal_dev, |
818d276c | 1011 | Opt_journal_checksum, Opt_journal_async_commit, |
ac27a0ec | 1012 | Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback, |
5bf5683a | 1013 | Opt_data_err_abort, Opt_data_err_ignore, |
ac27a0ec DK |
1014 | Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota, |
1015 | Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota, | |
1016 | Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota, | |
83982b6f | 1017 | Opt_grpquota, Opt_i_version, |
01436ef2 | 1018 | Opt_stripe, Opt_delalloc, Opt_nodelalloc, |
b3881f74 | 1019 | Opt_inode_readahead_blks, Opt_journal_ioprio |
ac27a0ec DK |
1020 | }; |
1021 | ||
a447c093 | 1022 | static const match_table_t tokens = { |
ac27a0ec DK |
1023 | {Opt_bsd_df, "bsddf"}, |
1024 | {Opt_minix_df, "minixdf"}, | |
1025 | {Opt_grpid, "grpid"}, | |
1026 | {Opt_grpid, "bsdgroups"}, | |
1027 | {Opt_nogrpid, "nogrpid"}, | |
1028 | {Opt_nogrpid, "sysvgroups"}, | |
1029 | {Opt_resgid, "resgid=%u"}, | |
1030 | {Opt_resuid, "resuid=%u"}, | |
1031 | {Opt_sb, "sb=%u"}, | |
1032 | {Opt_err_cont, "errors=continue"}, | |
1033 | {Opt_err_panic, "errors=panic"}, | |
1034 | {Opt_err_ro, "errors=remount-ro"}, | |
1035 | {Opt_nouid32, "nouid32"}, | |
ac27a0ec DK |
1036 | {Opt_debug, "debug"}, |
1037 | {Opt_oldalloc, "oldalloc"}, | |
1038 | {Opt_orlov, "orlov"}, | |
1039 | {Opt_user_xattr, "user_xattr"}, | |
1040 | {Opt_nouser_xattr, "nouser_xattr"}, | |
1041 | {Opt_acl, "acl"}, | |
1042 | {Opt_noacl, "noacl"}, | |
1043 | {Opt_reservation, "reservation"}, | |
1044 | {Opt_noreservation, "noreservation"}, | |
1045 | {Opt_noload, "noload"}, | |
1046 | {Opt_nobh, "nobh"}, | |
1047 | {Opt_bh, "bh"}, | |
1048 | {Opt_commit, "commit=%u"}, | |
30773840 TT |
1049 | {Opt_min_batch_time, "min_batch_time=%u"}, |
1050 | {Opt_max_batch_time, "max_batch_time=%u"}, | |
ac27a0ec | 1051 | {Opt_journal_update, "journal=update"}, |
ac27a0ec | 1052 | {Opt_journal_dev, "journal_dev=%u"}, |
818d276c GS |
1053 | {Opt_journal_checksum, "journal_checksum"}, |
1054 | {Opt_journal_async_commit, "journal_async_commit"}, | |
ac27a0ec DK |
1055 | {Opt_abort, "abort"}, |
1056 | {Opt_data_journal, "data=journal"}, | |
1057 | {Opt_data_ordered, "data=ordered"}, | |
1058 | {Opt_data_writeback, "data=writeback"}, | |
5bf5683a HK |
1059 | {Opt_data_err_abort, "data_err=abort"}, |
1060 | {Opt_data_err_ignore, "data_err=ignore"}, | |
ac27a0ec DK |
1061 | {Opt_offusrjquota, "usrjquota="}, |
1062 | {Opt_usrjquota, "usrjquota=%s"}, | |
1063 | {Opt_offgrpjquota, "grpjquota="}, | |
1064 | {Opt_grpjquota, "grpjquota=%s"}, | |
1065 | {Opt_jqfmt_vfsold, "jqfmt=vfsold"}, | |
1066 | {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"}, | |
1067 | {Opt_grpquota, "grpquota"}, | |
1068 | {Opt_noquota, "noquota"}, | |
1069 | {Opt_quota, "quota"}, | |
1070 | {Opt_usrquota, "usrquota"}, | |
1071 | {Opt_barrier, "barrier=%u"}, | |
25ec56b5 | 1072 | {Opt_i_version, "i_version"}, |
c9de560d | 1073 | {Opt_stripe, "stripe=%u"}, |
ac27a0ec | 1074 | {Opt_resize, "resize"}, |
64769240 | 1075 | {Opt_delalloc, "delalloc"}, |
dd919b98 | 1076 | {Opt_nodelalloc, "nodelalloc"}, |
240799cd | 1077 | {Opt_inode_readahead_blks, "inode_readahead_blks=%u"}, |
b3881f74 | 1078 | {Opt_journal_ioprio, "journal_ioprio=%u"}, |
f3f12faa | 1079 | {Opt_err, NULL}, |
ac27a0ec DK |
1080 | }; |
1081 | ||
617ba13b | 1082 | static ext4_fsblk_t get_sb_block(void **data) |
ac27a0ec | 1083 | { |
617ba13b | 1084 | ext4_fsblk_t sb_block; |
ac27a0ec DK |
1085 | char *options = (char *) *data; |
1086 | ||
1087 | if (!options || strncmp(options, "sb=", 3) != 0) | |
1088 | return 1; /* Default location */ | |
1089 | options += 3; | |
617ba13b | 1090 | /*todo: use simple_strtoll with >32bit ext4 */ |
ac27a0ec DK |
1091 | sb_block = simple_strtoul(options, &options, 0); |
1092 | if (*options && *options != ',') { | |
4776004f | 1093 | printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n", |
ac27a0ec DK |
1094 | (char *) *data); |
1095 | return 1; | |
1096 | } | |
1097 | if (*options == ',') | |
1098 | options++; | |
1099 | *data = (void *) options; | |
1100 | return sb_block; | |
1101 | } | |
1102 | ||
b3881f74 TT |
1103 | #define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3)) |
1104 | ||
2b2d6d01 | 1105 | static int parse_options(char *options, struct super_block *sb, |
c3191067 | 1106 | unsigned long *journal_devnum, |
b3881f74 | 1107 | unsigned int *journal_ioprio, |
2b2d6d01 | 1108 | ext4_fsblk_t *n_blocks_count, int is_remount) |
ac27a0ec | 1109 | { |
617ba13b | 1110 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
2b2d6d01 | 1111 | char *p; |
ac27a0ec DK |
1112 | substring_t args[MAX_OPT_ARGS]; |
1113 | int data_opt = 0; | |
1114 | int option; | |
1115 | #ifdef CONFIG_QUOTA | |
dfc5d03f | 1116 | int qtype, qfmt; |
ac27a0ec DK |
1117 | char *qname; |
1118 | #endif | |
1119 | ||
1120 | if (!options) | |
1121 | return 1; | |
1122 | ||
2b2d6d01 | 1123 | while ((p = strsep(&options, ",")) != NULL) { |
ac27a0ec DK |
1124 | int token; |
1125 | if (!*p) | |
1126 | continue; | |
1127 | ||
1128 | token = match_token(p, tokens, args); | |
1129 | switch (token) { | |
1130 | case Opt_bsd_df: | |
2b2d6d01 | 1131 | clear_opt(sbi->s_mount_opt, MINIX_DF); |
ac27a0ec DK |
1132 | break; |
1133 | case Opt_minix_df: | |
2b2d6d01 | 1134 | set_opt(sbi->s_mount_opt, MINIX_DF); |
ac27a0ec DK |
1135 | break; |
1136 | case Opt_grpid: | |
2b2d6d01 | 1137 | set_opt(sbi->s_mount_opt, GRPID); |
ac27a0ec DK |
1138 | break; |
1139 | case Opt_nogrpid: | |
2b2d6d01 | 1140 | clear_opt(sbi->s_mount_opt, GRPID); |
ac27a0ec DK |
1141 | break; |
1142 | case Opt_resuid: | |
1143 | if (match_int(&args[0], &option)) | |
1144 | return 0; | |
1145 | sbi->s_resuid = option; | |
1146 | break; | |
1147 | case Opt_resgid: | |
1148 | if (match_int(&args[0], &option)) | |
1149 | return 0; | |
1150 | sbi->s_resgid = option; | |
1151 | break; | |
1152 | case Opt_sb: | |
1153 | /* handled by get_sb_block() instead of here */ | |
1154 | /* *sb_block = match_int(&args[0]); */ | |
1155 | break; | |
1156 | case Opt_err_panic: | |
2b2d6d01 TT |
1157 | clear_opt(sbi->s_mount_opt, ERRORS_CONT); |
1158 | clear_opt(sbi->s_mount_opt, ERRORS_RO); | |
1159 | set_opt(sbi->s_mount_opt, ERRORS_PANIC); | |
ac27a0ec DK |
1160 | break; |
1161 | case Opt_err_ro: | |
2b2d6d01 TT |
1162 | clear_opt(sbi->s_mount_opt, ERRORS_CONT); |
1163 | clear_opt(sbi->s_mount_opt, ERRORS_PANIC); | |
1164 | set_opt(sbi->s_mount_opt, ERRORS_RO); | |
ac27a0ec DK |
1165 | break; |
1166 | case Opt_err_cont: | |
2b2d6d01 TT |
1167 | clear_opt(sbi->s_mount_opt, ERRORS_RO); |
1168 | clear_opt(sbi->s_mount_opt, ERRORS_PANIC); | |
1169 | set_opt(sbi->s_mount_opt, ERRORS_CONT); | |
ac27a0ec DK |
1170 | break; |
1171 | case Opt_nouid32: | |
2b2d6d01 | 1172 | set_opt(sbi->s_mount_opt, NO_UID32); |
ac27a0ec | 1173 | break; |
ac27a0ec | 1174 | case Opt_debug: |
2b2d6d01 | 1175 | set_opt(sbi->s_mount_opt, DEBUG); |
ac27a0ec DK |
1176 | break; |
1177 | case Opt_oldalloc: | |
2b2d6d01 | 1178 | set_opt(sbi->s_mount_opt, OLDALLOC); |
ac27a0ec DK |
1179 | break; |
1180 | case Opt_orlov: | |
2b2d6d01 | 1181 | clear_opt(sbi->s_mount_opt, OLDALLOC); |
ac27a0ec | 1182 | break; |
03010a33 | 1183 | #ifdef CONFIG_EXT4_FS_XATTR |
ac27a0ec | 1184 | case Opt_user_xattr: |
2b2d6d01 | 1185 | set_opt(sbi->s_mount_opt, XATTR_USER); |
ac27a0ec DK |
1186 | break; |
1187 | case Opt_nouser_xattr: | |
2b2d6d01 | 1188 | clear_opt(sbi->s_mount_opt, XATTR_USER); |
ac27a0ec DK |
1189 | break; |
1190 | #else | |
1191 | case Opt_user_xattr: | |
1192 | case Opt_nouser_xattr: | |
4776004f TT |
1193 | printk(KERN_ERR "EXT4 (no)user_xattr options " |
1194 | "not supported\n"); | |
ac27a0ec DK |
1195 | break; |
1196 | #endif | |
03010a33 | 1197 | #ifdef CONFIG_EXT4_FS_POSIX_ACL |
ac27a0ec DK |
1198 | case Opt_acl: |
1199 | set_opt(sbi->s_mount_opt, POSIX_ACL); | |
1200 | break; | |
1201 | case Opt_noacl: | |
1202 | clear_opt(sbi->s_mount_opt, POSIX_ACL); | |
1203 | break; | |
1204 | #else | |
1205 | case Opt_acl: | |
1206 | case Opt_noacl: | |
4776004f TT |
1207 | printk(KERN_ERR "EXT4 (no)acl options " |
1208 | "not supported\n"); | |
ac27a0ec DK |
1209 | break; |
1210 | #endif | |
1211 | case Opt_reservation: | |
1212 | set_opt(sbi->s_mount_opt, RESERVATION); | |
1213 | break; | |
1214 | case Opt_noreservation: | |
1215 | clear_opt(sbi->s_mount_opt, RESERVATION); | |
1216 | break; | |
1217 | case Opt_journal_update: | |
1218 | /* @@@ FIXME */ | |
1219 | /* Eventually we will want to be able to create | |
1220 | a journal file here. For now, only allow the | |
1221 | user to specify an existing inode to be the | |
1222 | journal file. */ | |
1223 | if (is_remount) { | |
617ba13b | 1224 | printk(KERN_ERR "EXT4-fs: cannot specify " |
ac27a0ec DK |
1225 | "journal on remount\n"); |
1226 | return 0; | |
1227 | } | |
2b2d6d01 | 1228 | set_opt(sbi->s_mount_opt, UPDATE_JOURNAL); |
ac27a0ec | 1229 | break; |
ac27a0ec DK |
1230 | case Opt_journal_dev: |
1231 | if (is_remount) { | |
617ba13b | 1232 | printk(KERN_ERR "EXT4-fs: cannot specify " |
ac27a0ec DK |
1233 | "journal on remount\n"); |
1234 | return 0; | |
1235 | } | |
1236 | if (match_int(&args[0], &option)) | |
1237 | return 0; | |
1238 | *journal_devnum = option; | |
1239 | break; | |
818d276c GS |
1240 | case Opt_journal_checksum: |
1241 | set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM); | |
1242 | break; | |
1243 | case Opt_journal_async_commit: | |
1244 | set_opt(sbi->s_mount_opt, JOURNAL_ASYNC_COMMIT); | |
1245 | set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM); | |
1246 | break; | |
ac27a0ec | 1247 | case Opt_noload: |
2b2d6d01 | 1248 | set_opt(sbi->s_mount_opt, NOLOAD); |
ac27a0ec DK |
1249 | break; |
1250 | case Opt_commit: | |
1251 | if (match_int(&args[0], &option)) | |
1252 | return 0; | |
1253 | if (option < 0) | |
1254 | return 0; | |
1255 | if (option == 0) | |
cd02ff0b | 1256 | option = JBD2_DEFAULT_MAX_COMMIT_AGE; |
ac27a0ec DK |
1257 | sbi->s_commit_interval = HZ * option; |
1258 | break; | |
30773840 TT |
1259 | case Opt_max_batch_time: |
1260 | if (match_int(&args[0], &option)) | |
1261 | return 0; | |
1262 | if (option < 0) | |
1263 | return 0; | |
1264 | if (option == 0) | |
1265 | option = EXT4_DEF_MAX_BATCH_TIME; | |
1266 | sbi->s_max_batch_time = option; | |
1267 | break; | |
1268 | case Opt_min_batch_time: | |
1269 | if (match_int(&args[0], &option)) | |
1270 | return 0; | |
1271 | if (option < 0) | |
1272 | return 0; | |
1273 | sbi->s_min_batch_time = option; | |
1274 | break; | |
ac27a0ec | 1275 | case Opt_data_journal: |
617ba13b | 1276 | data_opt = EXT4_MOUNT_JOURNAL_DATA; |
ac27a0ec DK |
1277 | goto datacheck; |
1278 | case Opt_data_ordered: | |
617ba13b | 1279 | data_opt = EXT4_MOUNT_ORDERED_DATA; |
ac27a0ec DK |
1280 | goto datacheck; |
1281 | case Opt_data_writeback: | |
617ba13b | 1282 | data_opt = EXT4_MOUNT_WRITEBACK_DATA; |
ac27a0ec DK |
1283 | datacheck: |
1284 | if (is_remount) { | |
617ba13b | 1285 | if ((sbi->s_mount_opt & EXT4_MOUNT_DATA_FLAGS) |
ac27a0ec DK |
1286 | != data_opt) { |
1287 | printk(KERN_ERR | |
617ba13b | 1288 | "EXT4-fs: cannot change data " |
ac27a0ec DK |
1289 | "mode on remount\n"); |
1290 | return 0; | |
1291 | } | |
1292 | } else { | |
617ba13b | 1293 | sbi->s_mount_opt &= ~EXT4_MOUNT_DATA_FLAGS; |
ac27a0ec DK |
1294 | sbi->s_mount_opt |= data_opt; |
1295 | } | |
1296 | break; | |
5bf5683a HK |
1297 | case Opt_data_err_abort: |
1298 | set_opt(sbi->s_mount_opt, DATA_ERR_ABORT); | |
1299 | break; | |
1300 | case Opt_data_err_ignore: | |
1301 | clear_opt(sbi->s_mount_opt, DATA_ERR_ABORT); | |
1302 | break; | |
ac27a0ec DK |
1303 | #ifdef CONFIG_QUOTA |
1304 | case Opt_usrjquota: | |
1305 | qtype = USRQUOTA; | |
1306 | goto set_qf_name; | |
1307 | case Opt_grpjquota: | |
1308 | qtype = GRPQUOTA; | |
1309 | set_qf_name: | |
17bd13b3 | 1310 | if (sb_any_quota_loaded(sb) && |
dfc5d03f | 1311 | !sbi->s_qf_names[qtype]) { |
ac27a0ec | 1312 | printk(KERN_ERR |
4776004f TT |
1313 | "EXT4-fs: Cannot change journaled " |
1314 | "quota options when quota turned on.\n"); | |
ac27a0ec DK |
1315 | return 0; |
1316 | } | |
1317 | qname = match_strdup(&args[0]); | |
1318 | if (!qname) { | |
1319 | printk(KERN_ERR | |
617ba13b | 1320 | "EXT4-fs: not enough memory for " |
ac27a0ec DK |
1321 | "storing quotafile name.\n"); |
1322 | return 0; | |
1323 | } | |
1324 | if (sbi->s_qf_names[qtype] && | |
1325 | strcmp(sbi->s_qf_names[qtype], qname)) { | |
1326 | printk(KERN_ERR | |
617ba13b | 1327 | "EXT4-fs: %s quota file already " |
ac27a0ec DK |
1328 | "specified.\n", QTYPE2NAME(qtype)); |
1329 | kfree(qname); | |
1330 | return 0; | |
1331 | } | |
1332 | sbi->s_qf_names[qtype] = qname; | |
1333 | if (strchr(sbi->s_qf_names[qtype], '/')) { | |
1334 | printk(KERN_ERR | |
617ba13b | 1335 | "EXT4-fs: quotafile must be on " |
ac27a0ec DK |
1336 | "filesystem root.\n"); |
1337 | kfree(sbi->s_qf_names[qtype]); | |
1338 | sbi->s_qf_names[qtype] = NULL; | |
1339 | return 0; | |
1340 | } | |
1341 | set_opt(sbi->s_mount_opt, QUOTA); | |
1342 | break; | |
1343 | case Opt_offusrjquota: | |
1344 | qtype = USRQUOTA; | |
1345 | goto clear_qf_name; | |
1346 | case Opt_offgrpjquota: | |
1347 | qtype = GRPQUOTA; | |
1348 | clear_qf_name: | |
17bd13b3 | 1349 | if (sb_any_quota_loaded(sb) && |
dfc5d03f | 1350 | sbi->s_qf_names[qtype]) { |
617ba13b | 1351 | printk(KERN_ERR "EXT4-fs: Cannot change " |
2c8be6b2 | 1352 | "journaled quota options when " |
ac27a0ec DK |
1353 | "quota turned on.\n"); |
1354 | return 0; | |
1355 | } | |
1356 | /* | |
1357 | * The space will be released later when all options | |
1358 | * are confirmed to be correct | |
1359 | */ | |
1360 | sbi->s_qf_names[qtype] = NULL; | |
1361 | break; | |
1362 | case Opt_jqfmt_vfsold: | |
dfc5d03f JK |
1363 | qfmt = QFMT_VFS_OLD; |
1364 | goto set_qf_format; | |
ac27a0ec | 1365 | case Opt_jqfmt_vfsv0: |
dfc5d03f JK |
1366 | qfmt = QFMT_VFS_V0; |
1367 | set_qf_format: | |
17bd13b3 | 1368 | if (sb_any_quota_loaded(sb) && |
dfc5d03f JK |
1369 | sbi->s_jquota_fmt != qfmt) { |
1370 | printk(KERN_ERR "EXT4-fs: Cannot change " | |
1371 | "journaled quota options when " | |
1372 | "quota turned on.\n"); | |
1373 | return 0; | |
1374 | } | |
1375 | sbi->s_jquota_fmt = qfmt; | |
ac27a0ec DK |
1376 | break; |
1377 | case Opt_quota: | |
1378 | case Opt_usrquota: | |
1379 | set_opt(sbi->s_mount_opt, QUOTA); | |
1380 | set_opt(sbi->s_mount_opt, USRQUOTA); | |
1381 | break; | |
1382 | case Opt_grpquota: | |
1383 | set_opt(sbi->s_mount_opt, QUOTA); | |
1384 | set_opt(sbi->s_mount_opt, GRPQUOTA); | |
1385 | break; | |
1386 | case Opt_noquota: | |
17bd13b3 | 1387 | if (sb_any_quota_loaded(sb)) { |
617ba13b | 1388 | printk(KERN_ERR "EXT4-fs: Cannot change quota " |
ac27a0ec DK |
1389 | "options when quota turned on.\n"); |
1390 | return 0; | |
1391 | } | |
1392 | clear_opt(sbi->s_mount_opt, QUOTA); | |
1393 | clear_opt(sbi->s_mount_opt, USRQUOTA); | |
1394 | clear_opt(sbi->s_mount_opt, GRPQUOTA); | |
1395 | break; | |
1396 | #else | |
1397 | case Opt_quota: | |
1398 | case Opt_usrquota: | |
1399 | case Opt_grpquota: | |
cd59e7b9 JK |
1400 | printk(KERN_ERR |
1401 | "EXT4-fs: quota options not supported.\n"); | |
1402 | break; | |
ac27a0ec DK |
1403 | case Opt_usrjquota: |
1404 | case Opt_grpjquota: | |
1405 | case Opt_offusrjquota: | |
1406 | case Opt_offgrpjquota: | |
1407 | case Opt_jqfmt_vfsold: | |
1408 | case Opt_jqfmt_vfsv0: | |
1409 | printk(KERN_ERR | |
cd59e7b9 | 1410 | "EXT4-fs: journaled quota options not " |
ac27a0ec DK |
1411 | "supported.\n"); |
1412 | break; | |
1413 | case Opt_noquota: | |
1414 | break; | |
1415 | #endif | |
1416 | case Opt_abort: | |
1417 | set_opt(sbi->s_mount_opt, ABORT); | |
1418 | break; | |
1419 | case Opt_barrier: | |
1420 | if (match_int(&args[0], &option)) | |
1421 | return 0; | |
1422 | if (option) | |
1423 | set_opt(sbi->s_mount_opt, BARRIER); | |
1424 | else | |
1425 | clear_opt(sbi->s_mount_opt, BARRIER); | |
1426 | break; | |
1427 | case Opt_ignore: | |
1428 | break; | |
1429 | case Opt_resize: | |
1430 | if (!is_remount) { | |
617ba13b | 1431 | printk("EXT4-fs: resize option only available " |
ac27a0ec DK |
1432 | "for remount\n"); |
1433 | return 0; | |
1434 | } | |
1435 | if (match_int(&args[0], &option) != 0) | |
1436 | return 0; | |
1437 | *n_blocks_count = option; | |
1438 | break; | |
1439 | case Opt_nobh: | |
1440 | set_opt(sbi->s_mount_opt, NOBH); | |
1441 | break; | |
1442 | case Opt_bh: | |
1443 | clear_opt(sbi->s_mount_opt, NOBH); | |
1444 | break; | |
25ec56b5 JNC |
1445 | case Opt_i_version: |
1446 | set_opt(sbi->s_mount_opt, I_VERSION); | |
1447 | sb->s_flags |= MS_I_VERSION; | |
1448 | break; | |
dd919b98 AK |
1449 | case Opt_nodelalloc: |
1450 | clear_opt(sbi->s_mount_opt, DELALLOC); | |
1451 | break; | |
c9de560d AT |
1452 | case Opt_stripe: |
1453 | if (match_int(&args[0], &option)) | |
1454 | return 0; | |
1455 | if (option < 0) | |
1456 | return 0; | |
1457 | sbi->s_stripe = option; | |
1458 | break; | |
64769240 AT |
1459 | case Opt_delalloc: |
1460 | set_opt(sbi->s_mount_opt, DELALLOC); | |
1461 | break; | |
240799cd TT |
1462 | case Opt_inode_readahead_blks: |
1463 | if (match_int(&args[0], &option)) | |
1464 | return 0; | |
1465 | if (option < 0 || option > (1 << 30)) | |
1466 | return 0; | |
1467 | sbi->s_inode_readahead_blks = option; | |
1468 | break; | |
b3881f74 TT |
1469 | case Opt_journal_ioprio: |
1470 | if (match_int(&args[0], &option)) | |
1471 | return 0; | |
1472 | if (option < 0 || option > 7) | |
1473 | break; | |
1474 | *journal_ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, | |
1475 | option); | |
1476 | break; | |
ac27a0ec | 1477 | default: |
2b2d6d01 TT |
1478 | printk(KERN_ERR |
1479 | "EXT4-fs: Unrecognized mount option \"%s\" " | |
1480 | "or missing value\n", p); | |
ac27a0ec DK |
1481 | return 0; |
1482 | } | |
1483 | } | |
1484 | #ifdef CONFIG_QUOTA | |
1485 | if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) { | |
617ba13b | 1486 | if ((sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA) && |
ac27a0ec DK |
1487 | sbi->s_qf_names[USRQUOTA]) |
1488 | clear_opt(sbi->s_mount_opt, USRQUOTA); | |
1489 | ||
617ba13b | 1490 | if ((sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA) && |
ac27a0ec DK |
1491 | sbi->s_qf_names[GRPQUOTA]) |
1492 | clear_opt(sbi->s_mount_opt, GRPQUOTA); | |
1493 | ||
1494 | if ((sbi->s_qf_names[USRQUOTA] && | |
617ba13b | 1495 | (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)) || |
ac27a0ec | 1496 | (sbi->s_qf_names[GRPQUOTA] && |
617ba13b MC |
1497 | (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA))) { |
1498 | printk(KERN_ERR "EXT4-fs: old and new quota " | |
ac27a0ec DK |
1499 | "format mixing.\n"); |
1500 | return 0; | |
1501 | } | |
1502 | ||
1503 | if (!sbi->s_jquota_fmt) { | |
2c8be6b2 | 1504 | printk(KERN_ERR "EXT4-fs: journaled quota format " |
ac27a0ec DK |
1505 | "not specified.\n"); |
1506 | return 0; | |
1507 | } | |
1508 | } else { | |
1509 | if (sbi->s_jquota_fmt) { | |
2c8be6b2 JK |
1510 | printk(KERN_ERR "EXT4-fs: journaled quota format " |
1511 | "specified with no journaling " | |
ac27a0ec DK |
1512 | "enabled.\n"); |
1513 | return 0; | |
1514 | } | |
1515 | } | |
1516 | #endif | |
1517 | return 1; | |
1518 | } | |
1519 | ||
617ba13b | 1520 | static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es, |
ac27a0ec DK |
1521 | int read_only) |
1522 | { | |
617ba13b | 1523 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
ac27a0ec DK |
1524 | int res = 0; |
1525 | ||
617ba13b | 1526 | if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) { |
2b2d6d01 TT |
1527 | printk(KERN_ERR "EXT4-fs warning: revision level too high, " |
1528 | "forcing read-only mode\n"); | |
ac27a0ec DK |
1529 | res = MS_RDONLY; |
1530 | } | |
1531 | if (read_only) | |
1532 | return res; | |
617ba13b | 1533 | if (!(sbi->s_mount_state & EXT4_VALID_FS)) |
2b2d6d01 TT |
1534 | printk(KERN_WARNING "EXT4-fs warning: mounting unchecked fs, " |
1535 | "running e2fsck is recommended\n"); | |
617ba13b | 1536 | else if ((sbi->s_mount_state & EXT4_ERROR_FS)) |
2b2d6d01 TT |
1537 | printk(KERN_WARNING |
1538 | "EXT4-fs warning: mounting fs with errors, " | |
1539 | "running e2fsck is recommended\n"); | |
ac27a0ec DK |
1540 | else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 && |
1541 | le16_to_cpu(es->s_mnt_count) >= | |
1542 | (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count)) | |
2b2d6d01 TT |
1543 | printk(KERN_WARNING |
1544 | "EXT4-fs warning: maximal mount count reached, " | |
1545 | "running e2fsck is recommended\n"); | |
ac27a0ec DK |
1546 | else if (le32_to_cpu(es->s_checkinterval) && |
1547 | (le32_to_cpu(es->s_lastcheck) + | |
1548 | le32_to_cpu(es->s_checkinterval) <= get_seconds())) | |
2b2d6d01 TT |
1549 | printk(KERN_WARNING |
1550 | "EXT4-fs warning: checktime reached, " | |
1551 | "running e2fsck is recommended\n"); | |
0390131b FM |
1552 | if (!sbi->s_journal) |
1553 | es->s_state &= cpu_to_le16(~EXT4_VALID_FS); | |
ac27a0ec | 1554 | if (!(__s16) le16_to_cpu(es->s_max_mnt_count)) |
617ba13b | 1555 | es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT); |
e8546d06 | 1556 | le16_add_cpu(&es->s_mnt_count, 1); |
ac27a0ec | 1557 | es->s_mtime = cpu_to_le32(get_seconds()); |
617ba13b | 1558 | ext4_update_dynamic_rev(sb); |
0390131b FM |
1559 | if (sbi->s_journal) |
1560 | EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); | |
ac27a0ec | 1561 | |
617ba13b | 1562 | ext4_commit_super(sb, es, 1); |
ac27a0ec | 1563 | if (test_opt(sb, DEBUG)) |
a9df9a49 | 1564 | printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, " |
ac27a0ec DK |
1565 | "bpg=%lu, ipg=%lu, mo=%04lx]\n", |
1566 | sb->s_blocksize, | |
1567 | sbi->s_groups_count, | |
617ba13b MC |
1568 | EXT4_BLOCKS_PER_GROUP(sb), |
1569 | EXT4_INODES_PER_GROUP(sb), | |
ac27a0ec DK |
1570 | sbi->s_mount_opt); |
1571 | ||
0390131b FM |
1572 | if (EXT4_SB(sb)->s_journal) { |
1573 | printk(KERN_INFO "EXT4 FS on %s, %s journal on %s\n", | |
1574 | sb->s_id, EXT4_SB(sb)->s_journal->j_inode ? "internal" : | |
1575 | "external", EXT4_SB(sb)->s_journal->j_devname); | |
1576 | } else { | |
1577 | printk(KERN_INFO "EXT4 FS on %s, no journal\n", sb->s_id); | |
1578 | } | |
ac27a0ec DK |
1579 | return res; |
1580 | } | |
1581 | ||
772cb7c8 JS |
1582 | static int ext4_fill_flex_info(struct super_block *sb) |
1583 | { | |
1584 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
1585 | struct ext4_group_desc *gdp = NULL; | |
1586 | struct buffer_head *bh; | |
1587 | ext4_group_t flex_group_count; | |
1588 | ext4_group_t flex_group; | |
1589 | int groups_per_flex = 0; | |
772cb7c8 JS |
1590 | int i; |
1591 | ||
1592 | if (!sbi->s_es->s_log_groups_per_flex) { | |
1593 | sbi->s_log_groups_per_flex = 0; | |
1594 | return 1; | |
1595 | } | |
1596 | ||
1597 | sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex; | |
1598 | groups_per_flex = 1 << sbi->s_log_groups_per_flex; | |
1599 | ||
c62a11fd FB |
1600 | /* We allocate both existing and potentially added groups */ |
1601 | flex_group_count = ((sbi->s_groups_count + groups_per_flex - 1) + | |
d94e99a6 AK |
1602 | ((le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) + 1) << |
1603 | EXT4_DESC_PER_BLOCK_BITS(sb))) / groups_per_flex; | |
ec05e868 | 1604 | sbi->s_flex_groups = kzalloc(flex_group_count * |
772cb7c8 JS |
1605 | sizeof(struct flex_groups), GFP_KERNEL); |
1606 | if (sbi->s_flex_groups == NULL) { | |
ec05e868 | 1607 | printk(KERN_ERR "EXT4-fs: not enough memory for " |
a9df9a49 | 1608 | "%u flex groups\n", flex_group_count); |
772cb7c8 JS |
1609 | goto failed; |
1610 | } | |
772cb7c8 | 1611 | |
772cb7c8 JS |
1612 | for (i = 0; i < sbi->s_groups_count; i++) { |
1613 | gdp = ext4_get_group_desc(sb, i, &bh); | |
1614 | ||
1615 | flex_group = ext4_flex_group(sbi, i); | |
1616 | sbi->s_flex_groups[flex_group].free_inodes += | |
560671a0 | 1617 | ext4_free_inodes_count(sb, gdp); |
772cb7c8 | 1618 | sbi->s_flex_groups[flex_group].free_blocks += |
560671a0 | 1619 | ext4_free_blks_count(sb, gdp); |
772cb7c8 JS |
1620 | } |
1621 | ||
1622 | return 1; | |
1623 | failed: | |
1624 | return 0; | |
1625 | } | |
1626 | ||
717d50e4 AD |
1627 | __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group, |
1628 | struct ext4_group_desc *gdp) | |
1629 | { | |
1630 | __u16 crc = 0; | |
1631 | ||
1632 | if (sbi->s_es->s_feature_ro_compat & | |
1633 | cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) { | |
1634 | int offset = offsetof(struct ext4_group_desc, bg_checksum); | |
1635 | __le32 le_group = cpu_to_le32(block_group); | |
1636 | ||
1637 | crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid)); | |
1638 | crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group)); | |
1639 | crc = crc16(crc, (__u8 *)gdp, offset); | |
1640 | offset += sizeof(gdp->bg_checksum); /* skip checksum */ | |
1641 | /* for checksum of struct ext4_group_desc do the rest...*/ | |
1642 | if ((sbi->s_es->s_feature_incompat & | |
1643 | cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) && | |
1644 | offset < le16_to_cpu(sbi->s_es->s_desc_size)) | |
1645 | crc = crc16(crc, (__u8 *)gdp + offset, | |
1646 | le16_to_cpu(sbi->s_es->s_desc_size) - | |
1647 | offset); | |
1648 | } | |
1649 | ||
1650 | return cpu_to_le16(crc); | |
1651 | } | |
1652 | ||
1653 | int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 block_group, | |
1654 | struct ext4_group_desc *gdp) | |
1655 | { | |
1656 | if ((sbi->s_es->s_feature_ro_compat & | |
1657 | cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) && | |
1658 | (gdp->bg_checksum != ext4_group_desc_csum(sbi, block_group, gdp))) | |
1659 | return 0; | |
1660 | ||
1661 | return 1; | |
1662 | } | |
1663 | ||
ac27a0ec | 1664 | /* Called at mount-time, super-block is locked */ |
197cd65a | 1665 | static int ext4_check_descriptors(struct super_block *sb) |
ac27a0ec | 1666 | { |
617ba13b MC |
1667 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
1668 | ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block); | |
1669 | ext4_fsblk_t last_block; | |
bd81d8ee LV |
1670 | ext4_fsblk_t block_bitmap; |
1671 | ext4_fsblk_t inode_bitmap; | |
1672 | ext4_fsblk_t inode_table; | |
ce421581 | 1673 | int flexbg_flag = 0; |
fd2d4291 | 1674 | ext4_group_t i; |
ac27a0ec | 1675 | |
ce421581 JS |
1676 | if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG)) |
1677 | flexbg_flag = 1; | |
1678 | ||
af5bc92d | 1679 | ext4_debug("Checking group descriptors"); |
ac27a0ec | 1680 | |
197cd65a AM |
1681 | for (i = 0; i < sbi->s_groups_count; i++) { |
1682 | struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL); | |
1683 | ||
ce421581 | 1684 | if (i == sbi->s_groups_count - 1 || flexbg_flag) |
bd81d8ee | 1685 | last_block = ext4_blocks_count(sbi->s_es) - 1; |
ac27a0ec DK |
1686 | else |
1687 | last_block = first_block + | |
617ba13b | 1688 | (EXT4_BLOCKS_PER_GROUP(sb) - 1); |
ac27a0ec | 1689 | |
8fadc143 | 1690 | block_bitmap = ext4_block_bitmap(sb, gdp); |
2b2d6d01 | 1691 | if (block_bitmap < first_block || block_bitmap > last_block) { |
c19204b0 | 1692 | printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: " |
a9df9a49 | 1693 | "Block bitmap for group %u not in group " |
5128273a | 1694 | "(block %llu)!\n", i, block_bitmap); |
ac27a0ec DK |
1695 | return 0; |
1696 | } | |
8fadc143 | 1697 | inode_bitmap = ext4_inode_bitmap(sb, gdp); |
2b2d6d01 | 1698 | if (inode_bitmap < first_block || inode_bitmap > last_block) { |
c19204b0 | 1699 | printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: " |
a9df9a49 | 1700 | "Inode bitmap for group %u not in group " |
5128273a | 1701 | "(block %llu)!\n", i, inode_bitmap); |
ac27a0ec DK |
1702 | return 0; |
1703 | } | |
8fadc143 | 1704 | inode_table = ext4_inode_table(sb, gdp); |
bd81d8ee | 1705 | if (inode_table < first_block || |
2b2d6d01 | 1706 | inode_table + sbi->s_itb_per_group - 1 > last_block) { |
c19204b0 | 1707 | printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: " |
a9df9a49 | 1708 | "Inode table for group %u not in group " |
5128273a | 1709 | "(block %llu)!\n", i, inode_table); |
ac27a0ec DK |
1710 | return 0; |
1711 | } | |
b5f10eed | 1712 | spin_lock(sb_bgl_lock(sbi, i)); |
717d50e4 | 1713 | if (!ext4_group_desc_csum_verify(sbi, i, gdp)) { |
c19204b0 | 1714 | printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: " |
a9df9a49 | 1715 | "Checksum for group %u failed (%u!=%u)\n", |
c19204b0 JB |
1716 | i, le16_to_cpu(ext4_group_desc_csum(sbi, i, |
1717 | gdp)), le16_to_cpu(gdp->bg_checksum)); | |
7ee1ec4c LZ |
1718 | if (!(sb->s_flags & MS_RDONLY)) { |
1719 | spin_unlock(sb_bgl_lock(sbi, i)); | |
8a266467 | 1720 | return 0; |
7ee1ec4c | 1721 | } |
717d50e4 | 1722 | } |
b5f10eed | 1723 | spin_unlock(sb_bgl_lock(sbi, i)); |
ce421581 JS |
1724 | if (!flexbg_flag) |
1725 | first_block += EXT4_BLOCKS_PER_GROUP(sb); | |
ac27a0ec DK |
1726 | } |
1727 | ||
bd81d8ee | 1728 | ext4_free_blocks_count_set(sbi->s_es, ext4_count_free_blocks(sb)); |
2b2d6d01 | 1729 | sbi->s_es->s_free_inodes_count = cpu_to_le32(ext4_count_free_inodes(sb)); |
ac27a0ec DK |
1730 | return 1; |
1731 | } | |
1732 | ||
617ba13b | 1733 | /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at |
ac27a0ec DK |
1734 | * the superblock) which were deleted from all directories, but held open by |
1735 | * a process at the time of a crash. We walk the list and try to delete these | |
1736 | * inodes at recovery time (only with a read-write filesystem). | |
1737 | * | |
1738 | * In order to keep the orphan inode chain consistent during traversal (in | |
1739 | * case of crash during recovery), we link each inode into the superblock | |
1740 | * orphan list_head and handle it the same way as an inode deletion during | |
1741 | * normal operation (which journals the operations for us). | |
1742 | * | |
1743 | * We only do an iget() and an iput() on each inode, which is very safe if we | |
1744 | * accidentally point at an in-use or already deleted inode. The worst that | |
1745 | * can happen in this case is that we get a "bit already cleared" message from | |
617ba13b | 1746 | * ext4_free_inode(). The only reason we would point at a wrong inode is if |
ac27a0ec DK |
1747 | * e2fsck was run on this filesystem, and it must have already done the orphan |
1748 | * inode cleanup for us, so we can safely abort without any further action. | |
1749 | */ | |
2b2d6d01 TT |
1750 | static void ext4_orphan_cleanup(struct super_block *sb, |
1751 | struct ext4_super_block *es) | |
ac27a0ec DK |
1752 | { |
1753 | unsigned int s_flags = sb->s_flags; | |
1754 | int nr_orphans = 0, nr_truncates = 0; | |
1755 | #ifdef CONFIG_QUOTA | |
1756 | int i; | |
1757 | #endif | |
1758 | if (!es->s_last_orphan) { | |
1759 | jbd_debug(4, "no orphan inodes to clean up\n"); | |
1760 | return; | |
1761 | } | |
1762 | ||
a8f48a95 ES |
1763 | if (bdev_read_only(sb->s_bdev)) { |
1764 | printk(KERN_ERR "EXT4-fs: write access " | |
1765 | "unavailable, skipping orphan cleanup.\n"); | |
1766 | return; | |
1767 | } | |
1768 | ||
617ba13b | 1769 | if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) { |
ac27a0ec DK |
1770 | if (es->s_last_orphan) |
1771 | jbd_debug(1, "Errors on filesystem, " | |
1772 | "clearing orphan list.\n"); | |
1773 | es->s_last_orphan = 0; | |
1774 | jbd_debug(1, "Skipping orphan recovery on fs with errors.\n"); | |
1775 | return; | |
1776 | } | |
1777 | ||
1778 | if (s_flags & MS_RDONLY) { | |
617ba13b | 1779 | printk(KERN_INFO "EXT4-fs: %s: orphan cleanup on readonly fs\n", |
ac27a0ec DK |
1780 | sb->s_id); |
1781 | sb->s_flags &= ~MS_RDONLY; | |
1782 | } | |
1783 | #ifdef CONFIG_QUOTA | |
1784 | /* Needed for iput() to work correctly and not trash data */ | |
1785 | sb->s_flags |= MS_ACTIVE; | |
1786 | /* Turn on quotas so that they are updated correctly */ | |
1787 | for (i = 0; i < MAXQUOTAS; i++) { | |
617ba13b MC |
1788 | if (EXT4_SB(sb)->s_qf_names[i]) { |
1789 | int ret = ext4_quota_on_mount(sb, i); | |
ac27a0ec DK |
1790 | if (ret < 0) |
1791 | printk(KERN_ERR | |
2c8be6b2 | 1792 | "EXT4-fs: Cannot turn on journaled " |
ac27a0ec DK |
1793 | "quota: error %d\n", ret); |
1794 | } | |
1795 | } | |
1796 | #endif | |
1797 | ||
1798 | while (es->s_last_orphan) { | |
1799 | struct inode *inode; | |
1800 | ||
97bd42b9 JB |
1801 | inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan)); |
1802 | if (IS_ERR(inode)) { | |
ac27a0ec DK |
1803 | es->s_last_orphan = 0; |
1804 | break; | |
1805 | } | |
1806 | ||
617ba13b | 1807 | list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan); |
a269eb18 | 1808 | vfs_dq_init(inode); |
ac27a0ec DK |
1809 | if (inode->i_nlink) { |
1810 | printk(KERN_DEBUG | |
e5f8eab8 | 1811 | "%s: truncating inode %lu to %lld bytes\n", |
46e665e9 | 1812 | __func__, inode->i_ino, inode->i_size); |
e5f8eab8 | 1813 | jbd_debug(2, "truncating inode %lu to %lld bytes\n", |
ac27a0ec | 1814 | inode->i_ino, inode->i_size); |
617ba13b | 1815 | ext4_truncate(inode); |
ac27a0ec DK |
1816 | nr_truncates++; |
1817 | } else { | |
1818 | printk(KERN_DEBUG | |
1819 | "%s: deleting unreferenced inode %lu\n", | |
46e665e9 | 1820 | __func__, inode->i_ino); |
ac27a0ec DK |
1821 | jbd_debug(2, "deleting unreferenced inode %lu\n", |
1822 | inode->i_ino); | |
1823 | nr_orphans++; | |
1824 | } | |
1825 | iput(inode); /* The delete magic happens here! */ | |
1826 | } | |
1827 | ||
2b2d6d01 | 1828 | #define PLURAL(x) (x), ((x) == 1) ? "" : "s" |
ac27a0ec DK |
1829 | |
1830 | if (nr_orphans) | |
617ba13b | 1831 | printk(KERN_INFO "EXT4-fs: %s: %d orphan inode%s deleted\n", |
ac27a0ec DK |
1832 | sb->s_id, PLURAL(nr_orphans)); |
1833 | if (nr_truncates) | |
617ba13b | 1834 | printk(KERN_INFO "EXT4-fs: %s: %d truncate%s cleaned up\n", |
ac27a0ec DK |
1835 | sb->s_id, PLURAL(nr_truncates)); |
1836 | #ifdef CONFIG_QUOTA | |
1837 | /* Turn quotas off */ | |
1838 | for (i = 0; i < MAXQUOTAS; i++) { | |
1839 | if (sb_dqopt(sb)->files[i]) | |
6f28e087 | 1840 | vfs_quota_off(sb, i, 0); |
ac27a0ec DK |
1841 | } |
1842 | #endif | |
1843 | sb->s_flags = s_flags; /* Restore MS_RDONLY status */ | |
1844 | } | |
cd2291a4 ES |
1845 | /* |
1846 | * Maximal extent format file size. | |
1847 | * Resulting logical blkno at s_maxbytes must fit in our on-disk | |
1848 | * extent format containers, within a sector_t, and within i_blocks | |
1849 | * in the vfs. ext4 inode has 48 bits of i_block in fsblock units, | |
1850 | * so that won't be a limiting factor. | |
1851 | * | |
1852 | * Note, this does *not* consider any metadata overhead for vfs i_blocks. | |
1853 | */ | |
f287a1a5 | 1854 | static loff_t ext4_max_size(int blkbits, int has_huge_files) |
cd2291a4 ES |
1855 | { |
1856 | loff_t res; | |
1857 | loff_t upper_limit = MAX_LFS_FILESIZE; | |
1858 | ||
1859 | /* small i_blocks in vfs inode? */ | |
f287a1a5 | 1860 | if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) { |
cd2291a4 | 1861 | /* |
b3a6ffe1 | 1862 | * CONFIG_LBD is not enabled implies the inode |
cd2291a4 ES |
1863 | * i_block represent total blocks in 512 bytes |
1864 | * 32 == size of vfs inode i_blocks * 8 | |
1865 | */ | |
1866 | upper_limit = (1LL << 32) - 1; | |
1867 | ||
1868 | /* total blocks in file system block size */ | |
1869 | upper_limit >>= (blkbits - 9); | |
1870 | upper_limit <<= blkbits; | |
1871 | } | |
1872 | ||
1873 | /* 32-bit extent-start container, ee_block */ | |
1874 | res = 1LL << 32; | |
1875 | res <<= blkbits; | |
1876 | res -= 1; | |
1877 | ||
1878 | /* Sanity check against vm- & vfs- imposed limits */ | |
1879 | if (res > upper_limit) | |
1880 | res = upper_limit; | |
1881 | ||
1882 | return res; | |
1883 | } | |
ac27a0ec | 1884 | |
ac27a0ec | 1885 | /* |
cd2291a4 | 1886 | * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect |
0fc1b451 AK |
1887 | * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks. |
1888 | * We need to be 1 filesystem block less than the 2^48 sector limit. | |
ac27a0ec | 1889 | */ |
f287a1a5 | 1890 | static loff_t ext4_max_bitmap_size(int bits, int has_huge_files) |
ac27a0ec | 1891 | { |
617ba13b | 1892 | loff_t res = EXT4_NDIR_BLOCKS; |
0fc1b451 AK |
1893 | int meta_blocks; |
1894 | loff_t upper_limit; | |
1895 | /* This is calculated to be the largest file size for a | |
cd2291a4 | 1896 | * dense, bitmapped file such that the total number of |
ac27a0ec | 1897 | * sectors in the file, including data and all indirect blocks, |
0fc1b451 AK |
1898 | * does not exceed 2^48 -1 |
1899 | * __u32 i_blocks_lo and _u16 i_blocks_high representing the | |
1900 | * total number of 512 bytes blocks of the file | |
1901 | */ | |
1902 | ||
f287a1a5 | 1903 | if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) { |
0fc1b451 | 1904 | /* |
b3a6ffe1 | 1905 | * !has_huge_files or CONFIG_LBD is not enabled |
f287a1a5 TT |
1906 | * implies the inode i_block represent total blocks in |
1907 | * 512 bytes 32 == size of vfs inode i_blocks * 8 | |
0fc1b451 AK |
1908 | */ |
1909 | upper_limit = (1LL << 32) - 1; | |
1910 | ||
1911 | /* total blocks in file system block size */ | |
1912 | upper_limit >>= (bits - 9); | |
1913 | ||
1914 | } else { | |
8180a562 AK |
1915 | /* |
1916 | * We use 48 bit ext4_inode i_blocks | |
1917 | * With EXT4_HUGE_FILE_FL set the i_blocks | |
1918 | * represent total number of blocks in | |
1919 | * file system block size | |
1920 | */ | |
0fc1b451 AK |
1921 | upper_limit = (1LL << 48) - 1; |
1922 | ||
0fc1b451 AK |
1923 | } |
1924 | ||
1925 | /* indirect blocks */ | |
1926 | meta_blocks = 1; | |
1927 | /* double indirect blocks */ | |
1928 | meta_blocks += 1 + (1LL << (bits-2)); | |
1929 | /* tripple indirect blocks */ | |
1930 | meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2))); | |
1931 | ||
1932 | upper_limit -= meta_blocks; | |
1933 | upper_limit <<= bits; | |
ac27a0ec DK |
1934 | |
1935 | res += 1LL << (bits-2); | |
1936 | res += 1LL << (2*(bits-2)); | |
1937 | res += 1LL << (3*(bits-2)); | |
1938 | res <<= bits; | |
1939 | if (res > upper_limit) | |
1940 | res = upper_limit; | |
0fc1b451 AK |
1941 | |
1942 | if (res > MAX_LFS_FILESIZE) | |
1943 | res = MAX_LFS_FILESIZE; | |
1944 | ||
ac27a0ec DK |
1945 | return res; |
1946 | } | |
1947 | ||
617ba13b | 1948 | static ext4_fsblk_t descriptor_loc(struct super_block *sb, |
70bbb3e0 | 1949 | ext4_fsblk_t logical_sb_block, int nr) |
ac27a0ec | 1950 | { |
617ba13b | 1951 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
fd2d4291 | 1952 | ext4_group_t bg, first_meta_bg; |
ac27a0ec DK |
1953 | int has_super = 0; |
1954 | ||
1955 | first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg); | |
1956 | ||
617ba13b | 1957 | if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) || |
ac27a0ec | 1958 | nr < first_meta_bg) |
70bbb3e0 | 1959 | return logical_sb_block + nr + 1; |
ac27a0ec | 1960 | bg = sbi->s_desc_per_block * nr; |
617ba13b | 1961 | if (ext4_bg_has_super(sb, bg)) |
ac27a0ec | 1962 | has_super = 1; |
617ba13b | 1963 | return (has_super + ext4_group_first_block_no(sb, bg)); |
ac27a0ec DK |
1964 | } |
1965 | ||
c9de560d AT |
1966 | /** |
1967 | * ext4_get_stripe_size: Get the stripe size. | |
1968 | * @sbi: In memory super block info | |
1969 | * | |
1970 | * If we have specified it via mount option, then | |
1971 | * use the mount option value. If the value specified at mount time is | |
1972 | * greater than the blocks per group use the super block value. | |
1973 | * If the super block value is greater than blocks per group return 0. | |
1974 | * Allocator needs it be less than blocks per group. | |
1975 | * | |
1976 | */ | |
1977 | static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi) | |
1978 | { | |
1979 | unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride); | |
1980 | unsigned long stripe_width = | |
1981 | le32_to_cpu(sbi->s_es->s_raid_stripe_width); | |
1982 | ||
1983 | if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group) | |
1984 | return sbi->s_stripe; | |
1985 | ||
1986 | if (stripe_width <= sbi->s_blocks_per_group) | |
1987 | return stripe_width; | |
1988 | ||
1989 | if (stride <= sbi->s_blocks_per_group) | |
1990 | return stride; | |
1991 | ||
1992 | return 0; | |
1993 | } | |
ac27a0ec | 1994 | |
2b2d6d01 | 1995 | static int ext4_fill_super(struct super_block *sb, void *data, int silent) |
7477827f AK |
1996 | __releases(kernel_lock) |
1997 | __acquires(kernel_lock) | |
1d03ec98 | 1998 | |
ac27a0ec | 1999 | { |
2b2d6d01 | 2000 | struct buffer_head *bh; |
617ba13b MC |
2001 | struct ext4_super_block *es = NULL; |
2002 | struct ext4_sb_info *sbi; | |
2003 | ext4_fsblk_t block; | |
2004 | ext4_fsblk_t sb_block = get_sb_block(&data); | |
70bbb3e0 | 2005 | ext4_fsblk_t logical_sb_block; |
ac27a0ec | 2006 | unsigned long offset = 0; |
ac27a0ec DK |
2007 | unsigned long journal_devnum = 0; |
2008 | unsigned long def_mount_opts; | |
2009 | struct inode *root; | |
9f6200bb | 2010 | char *cp; |
0390131b | 2011 | const char *descr; |
1d1fe1ee | 2012 | int ret = -EINVAL; |
ac27a0ec | 2013 | int blocksize; |
4ec11028 TT |
2014 | unsigned int db_count; |
2015 | unsigned int i; | |
f287a1a5 | 2016 | int needs_recovery, has_huge_files; |
3a06d778 | 2017 | int features; |
bd81d8ee | 2018 | __u64 blocks_count; |
833f4077 | 2019 | int err; |
b3881f74 | 2020 | unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO; |
ac27a0ec DK |
2021 | |
2022 | sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); | |
2023 | if (!sbi) | |
2024 | return -ENOMEM; | |
705895b6 PE |
2025 | |
2026 | sbi->s_blockgroup_lock = | |
2027 | kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL); | |
2028 | if (!sbi->s_blockgroup_lock) { | |
2029 | kfree(sbi); | |
2030 | return -ENOMEM; | |
2031 | } | |
ac27a0ec DK |
2032 | sb->s_fs_info = sbi; |
2033 | sbi->s_mount_opt = 0; | |
617ba13b MC |
2034 | sbi->s_resuid = EXT4_DEF_RESUID; |
2035 | sbi->s_resgid = EXT4_DEF_RESGID; | |
240799cd | 2036 | sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS; |
d9c9bef1 | 2037 | sbi->s_sb_block = sb_block; |
ac27a0ec DK |
2038 | |
2039 | unlock_kernel(); | |
2040 | ||
9f6200bb TT |
2041 | /* Cleanup superblock name */ |
2042 | for (cp = sb->s_id; (cp = strchr(cp, '/'));) | |
2043 | *cp = '!'; | |
2044 | ||
617ba13b | 2045 | blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE); |
ac27a0ec | 2046 | if (!blocksize) { |
617ba13b | 2047 | printk(KERN_ERR "EXT4-fs: unable to set blocksize\n"); |
ac27a0ec DK |
2048 | goto out_fail; |
2049 | } | |
2050 | ||
2051 | /* | |
617ba13b | 2052 | * The ext4 superblock will not be buffer aligned for other than 1kB |
ac27a0ec DK |
2053 | * block sizes. We need to calculate the offset from buffer start. |
2054 | */ | |
617ba13b | 2055 | if (blocksize != EXT4_MIN_BLOCK_SIZE) { |
70bbb3e0 AM |
2056 | logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE; |
2057 | offset = do_div(logical_sb_block, blocksize); | |
ac27a0ec | 2058 | } else { |
70bbb3e0 | 2059 | logical_sb_block = sb_block; |
ac27a0ec DK |
2060 | } |
2061 | ||
70bbb3e0 | 2062 | if (!(bh = sb_bread(sb, logical_sb_block))) { |
2b2d6d01 | 2063 | printk(KERN_ERR "EXT4-fs: unable to read superblock\n"); |
ac27a0ec DK |
2064 | goto out_fail; |
2065 | } | |
2066 | /* | |
2067 | * Note: s_es must be initialized as soon as possible because | |
617ba13b | 2068 | * some ext4 macro-instructions depend on its value |
ac27a0ec | 2069 | */ |
617ba13b | 2070 | es = (struct ext4_super_block *) (((char *)bh->b_data) + offset); |
ac27a0ec DK |
2071 | sbi->s_es = es; |
2072 | sb->s_magic = le16_to_cpu(es->s_magic); | |
617ba13b MC |
2073 | if (sb->s_magic != EXT4_SUPER_MAGIC) |
2074 | goto cantfind_ext4; | |
ac27a0ec DK |
2075 | |
2076 | /* Set defaults before we parse the mount options */ | |
2077 | def_mount_opts = le32_to_cpu(es->s_default_mount_opts); | |
617ba13b | 2078 | if (def_mount_opts & EXT4_DEFM_DEBUG) |
ac27a0ec | 2079 | set_opt(sbi->s_mount_opt, DEBUG); |
617ba13b | 2080 | if (def_mount_opts & EXT4_DEFM_BSDGROUPS) |
ac27a0ec | 2081 | set_opt(sbi->s_mount_opt, GRPID); |
617ba13b | 2082 | if (def_mount_opts & EXT4_DEFM_UID16) |
ac27a0ec | 2083 | set_opt(sbi->s_mount_opt, NO_UID32); |
03010a33 | 2084 | #ifdef CONFIG_EXT4_FS_XATTR |
617ba13b | 2085 | if (def_mount_opts & EXT4_DEFM_XATTR_USER) |
ac27a0ec | 2086 | set_opt(sbi->s_mount_opt, XATTR_USER); |
2e7842b8 | 2087 | #endif |
03010a33 | 2088 | #ifdef CONFIG_EXT4_FS_POSIX_ACL |
617ba13b | 2089 | if (def_mount_opts & EXT4_DEFM_ACL) |
ac27a0ec | 2090 | set_opt(sbi->s_mount_opt, POSIX_ACL); |
2e7842b8 | 2091 | #endif |
617ba13b MC |
2092 | if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA) |
2093 | sbi->s_mount_opt |= EXT4_MOUNT_JOURNAL_DATA; | |
2094 | else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED) | |
2095 | sbi->s_mount_opt |= EXT4_MOUNT_ORDERED_DATA; | |
2096 | else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK) | |
2097 | sbi->s_mount_opt |= EXT4_MOUNT_WRITEBACK_DATA; | |
2098 | ||
2099 | if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC) | |
ac27a0ec | 2100 | set_opt(sbi->s_mount_opt, ERRORS_PANIC); |
bb4f397a | 2101 | else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE) |
ceea16bf | 2102 | set_opt(sbi->s_mount_opt, ERRORS_CONT); |
bb4f397a AK |
2103 | else |
2104 | set_opt(sbi->s_mount_opt, ERRORS_RO); | |
ac27a0ec DK |
2105 | |
2106 | sbi->s_resuid = le16_to_cpu(es->s_def_resuid); | |
2107 | sbi->s_resgid = le16_to_cpu(es->s_def_resgid); | |
30773840 TT |
2108 | sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ; |
2109 | sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME; | |
2110 | sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME; | |
ac27a0ec DK |
2111 | |
2112 | set_opt(sbi->s_mount_opt, RESERVATION); | |
571640ca | 2113 | set_opt(sbi->s_mount_opt, BARRIER); |
ac27a0ec | 2114 | |
dd919b98 AK |
2115 | /* |
2116 | * enable delayed allocation by default | |
2117 | * Use -o nodelalloc to turn it off | |
2118 | */ | |
2119 | set_opt(sbi->s_mount_opt, DELALLOC); | |
2120 | ||
2121 | ||
b3881f74 TT |
2122 | if (!parse_options((char *) data, sb, &journal_devnum, |
2123 | &journal_ioprio, NULL, 0)) | |
ac27a0ec DK |
2124 | goto failed_mount; |
2125 | ||
2126 | sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | | |
617ba13b | 2127 | ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0); |
ac27a0ec | 2128 | |
617ba13b MC |
2129 | if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV && |
2130 | (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) || | |
2131 | EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) || | |
2132 | EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U))) | |
ac27a0ec | 2133 | printk(KERN_WARNING |
617ba13b | 2134 | "EXT4-fs warning: feature flags set on rev 0 fs, " |
ac27a0ec | 2135 | "running e2fsck is recommended\n"); |
469108ff | 2136 | |
ac27a0ec DK |
2137 | /* |
2138 | * Check feature flags regardless of the revision level, since we | |
2139 | * previously didn't change the revision level when setting the flags, | |
2140 | * so there is a chance incompat flags are set on a rev 0 filesystem. | |
2141 | */ | |
617ba13b | 2142 | features = EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP); |
ac27a0ec | 2143 | if (features) { |
617ba13b | 2144 | printk(KERN_ERR "EXT4-fs: %s: couldn't mount because of " |
3a06d778 AK |
2145 | "unsupported optional features (%x).\n", sb->s_id, |
2146 | (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) & | |
2147 | ~EXT4_FEATURE_INCOMPAT_SUPP)); | |
ac27a0ec DK |
2148 | goto failed_mount; |
2149 | } | |
617ba13b | 2150 | features = EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP); |
ac27a0ec | 2151 | if (!(sb->s_flags & MS_RDONLY) && features) { |
617ba13b | 2152 | printk(KERN_ERR "EXT4-fs: %s: couldn't mount RDWR because of " |
3a06d778 AK |
2153 | "unsupported optional features (%x).\n", sb->s_id, |
2154 | (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) & | |
2155 | ~EXT4_FEATURE_RO_COMPAT_SUPP)); | |
ac27a0ec DK |
2156 | goto failed_mount; |
2157 | } | |
f287a1a5 TT |
2158 | has_huge_files = EXT4_HAS_RO_COMPAT_FEATURE(sb, |
2159 | EXT4_FEATURE_RO_COMPAT_HUGE_FILE); | |
2160 | if (has_huge_files) { | |
0fc1b451 AK |
2161 | /* |
2162 | * Large file size enabled file system can only be | |
b3a6ffe1 | 2163 | * mount if kernel is build with CONFIG_LBD |
0fc1b451 AK |
2164 | */ |
2165 | if (sizeof(root->i_blocks) < sizeof(u64) && | |
2166 | !(sb->s_flags & MS_RDONLY)) { | |
2167 | printk(KERN_ERR "EXT4-fs: %s: Filesystem with huge " | |
2168 | "files cannot be mounted read-write " | |
b3a6ffe1 | 2169 | "without CONFIG_LBD.\n", sb->s_id); |
0fc1b451 AK |
2170 | goto failed_mount; |
2171 | } | |
2172 | } | |
ac27a0ec DK |
2173 | blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size); |
2174 | ||
617ba13b MC |
2175 | if (blocksize < EXT4_MIN_BLOCK_SIZE || |
2176 | blocksize > EXT4_MAX_BLOCK_SIZE) { | |
ac27a0ec | 2177 | printk(KERN_ERR |
617ba13b | 2178 | "EXT4-fs: Unsupported filesystem blocksize %d on %s.\n", |
ac27a0ec DK |
2179 | blocksize, sb->s_id); |
2180 | goto failed_mount; | |
2181 | } | |
2182 | ||
ac27a0ec | 2183 | if (sb->s_blocksize != blocksize) { |
ce40733c AK |
2184 | |
2185 | /* Validate the filesystem blocksize */ | |
2186 | if (!sb_set_blocksize(sb, blocksize)) { | |
2187 | printk(KERN_ERR "EXT4-fs: bad block size %d.\n", | |
2188 | blocksize); | |
ac27a0ec DK |
2189 | goto failed_mount; |
2190 | } | |
2191 | ||
2b2d6d01 | 2192 | brelse(bh); |
70bbb3e0 AM |
2193 | logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE; |
2194 | offset = do_div(logical_sb_block, blocksize); | |
2195 | bh = sb_bread(sb, logical_sb_block); | |
ac27a0ec DK |
2196 | if (!bh) { |
2197 | printk(KERN_ERR | |
617ba13b | 2198 | "EXT4-fs: Can't read superblock on 2nd try.\n"); |
ac27a0ec DK |
2199 | goto failed_mount; |
2200 | } | |
617ba13b | 2201 | es = (struct ext4_super_block *)(((char *)bh->b_data) + offset); |
ac27a0ec | 2202 | sbi->s_es = es; |
617ba13b | 2203 | if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) { |
2b2d6d01 TT |
2204 | printk(KERN_ERR |
2205 | "EXT4-fs: Magic mismatch, very weird !\n"); | |
ac27a0ec DK |
2206 | goto failed_mount; |
2207 | } | |
2208 | } | |
2209 | ||
f287a1a5 TT |
2210 | sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits, |
2211 | has_huge_files); | |
2212 | sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files); | |
ac27a0ec | 2213 | |
617ba13b MC |
2214 | if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) { |
2215 | sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE; | |
2216 | sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO; | |
ac27a0ec DK |
2217 | } else { |
2218 | sbi->s_inode_size = le16_to_cpu(es->s_inode_size); | |
2219 | sbi->s_first_ino = le32_to_cpu(es->s_first_ino); | |
617ba13b | 2220 | if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) || |
1330593e | 2221 | (!is_power_of_2(sbi->s_inode_size)) || |
ac27a0ec | 2222 | (sbi->s_inode_size > blocksize)) { |
2b2d6d01 TT |
2223 | printk(KERN_ERR |
2224 | "EXT4-fs: unsupported inode size: %d\n", | |
2225 | sbi->s_inode_size); | |
ac27a0ec DK |
2226 | goto failed_mount; |
2227 | } | |
ef7f3835 KS |
2228 | if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) |
2229 | sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2); | |
ac27a0ec | 2230 | } |
0d1ee42f AR |
2231 | sbi->s_desc_size = le16_to_cpu(es->s_desc_size); |
2232 | if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) { | |
8fadc143 | 2233 | if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT || |
0d1ee42f | 2234 | sbi->s_desc_size > EXT4_MAX_DESC_SIZE || |
d8ea6cf8 | 2235 | !is_power_of_2(sbi->s_desc_size)) { |
0d1ee42f | 2236 | printk(KERN_ERR |
8fadc143 | 2237 | "EXT4-fs: unsupported descriptor size %lu\n", |
0d1ee42f AR |
2238 | sbi->s_desc_size); |
2239 | goto failed_mount; | |
2240 | } | |
2241 | } else | |
2242 | sbi->s_desc_size = EXT4_MIN_DESC_SIZE; | |
ac27a0ec | 2243 | sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group); |
ac27a0ec | 2244 | sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group); |
b47b6f38 | 2245 | if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0) |
617ba13b MC |
2246 | goto cantfind_ext4; |
2247 | sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb); | |
ac27a0ec | 2248 | if (sbi->s_inodes_per_block == 0) |
617ba13b | 2249 | goto cantfind_ext4; |
ac27a0ec DK |
2250 | sbi->s_itb_per_group = sbi->s_inodes_per_group / |
2251 | sbi->s_inodes_per_block; | |
0d1ee42f | 2252 | sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb); |
ac27a0ec DK |
2253 | sbi->s_sbh = bh; |
2254 | sbi->s_mount_state = le16_to_cpu(es->s_state); | |
e57aa839 FW |
2255 | sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb)); |
2256 | sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb)); | |
2b2d6d01 | 2257 | for (i = 0; i < 4; i++) |
ac27a0ec DK |
2258 | sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]); |
2259 | sbi->s_def_hash_version = es->s_def_hash_version; | |
f99b2589 TT |
2260 | i = le32_to_cpu(es->s_flags); |
2261 | if (i & EXT2_FLAGS_UNSIGNED_HASH) | |
2262 | sbi->s_hash_unsigned = 3; | |
2263 | else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) { | |
2264 | #ifdef __CHAR_UNSIGNED__ | |
2265 | es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH); | |
2266 | sbi->s_hash_unsigned = 3; | |
2267 | #else | |
2268 | es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH); | |
2269 | #endif | |
2270 | sb->s_dirt = 1; | |
2271 | } | |
ac27a0ec DK |
2272 | |
2273 | if (sbi->s_blocks_per_group > blocksize * 8) { | |
2b2d6d01 TT |
2274 | printk(KERN_ERR |
2275 | "EXT4-fs: #blocks per group too big: %lu\n", | |
2276 | sbi->s_blocks_per_group); | |
ac27a0ec DK |
2277 | goto failed_mount; |
2278 | } | |
ac27a0ec | 2279 | if (sbi->s_inodes_per_group > blocksize * 8) { |
2b2d6d01 TT |
2280 | printk(KERN_ERR |
2281 | "EXT4-fs: #inodes per group too big: %lu\n", | |
2282 | sbi->s_inodes_per_group); | |
ac27a0ec DK |
2283 | goto failed_mount; |
2284 | } | |
2285 | ||
bd81d8ee | 2286 | if (ext4_blocks_count(es) > |
ac27a0ec | 2287 | (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) { |
617ba13b | 2288 | printk(KERN_ERR "EXT4-fs: filesystem on %s:" |
ac27a0ec DK |
2289 | " too large to mount safely\n", sb->s_id); |
2290 | if (sizeof(sector_t) < 8) | |
617ba13b | 2291 | printk(KERN_WARNING "EXT4-fs: CONFIG_LBD not " |
ac27a0ec DK |
2292 | "enabled\n"); |
2293 | goto failed_mount; | |
2294 | } | |
2295 | ||
617ba13b MC |
2296 | if (EXT4_BLOCKS_PER_GROUP(sb) == 0) |
2297 | goto cantfind_ext4; | |
e7c95593 | 2298 | |
4ec11028 TT |
2299 | /* |
2300 | * It makes no sense for the first data block to be beyond the end | |
2301 | * of the filesystem. | |
2302 | */ | |
2303 | if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) { | |
2304 | printk(KERN_WARNING "EXT4-fs: bad geometry: first data" | |
2305 | "block %u is beyond end of filesystem (%llu)\n", | |
2306 | le32_to_cpu(es->s_first_data_block), | |
2307 | ext4_blocks_count(es)); | |
e7c95593 ES |
2308 | goto failed_mount; |
2309 | } | |
bd81d8ee LV |
2310 | blocks_count = (ext4_blocks_count(es) - |
2311 | le32_to_cpu(es->s_first_data_block) + | |
2312 | EXT4_BLOCKS_PER_GROUP(sb) - 1); | |
2313 | do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb)); | |
4ec11028 TT |
2314 | if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) { |
2315 | printk(KERN_WARNING "EXT4-fs: groups count too large: %u " | |
2316 | "(block count %llu, first data block %u, " | |
2317 | "blocks per group %lu)\n", sbi->s_groups_count, | |
2318 | ext4_blocks_count(es), | |
2319 | le32_to_cpu(es->s_first_data_block), | |
2320 | EXT4_BLOCKS_PER_GROUP(sb)); | |
2321 | goto failed_mount; | |
2322 | } | |
bd81d8ee | 2323 | sbi->s_groups_count = blocks_count; |
617ba13b MC |
2324 | db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) / |
2325 | EXT4_DESC_PER_BLOCK(sb); | |
2b2d6d01 | 2326 | sbi->s_group_desc = kmalloc(db_count * sizeof(struct buffer_head *), |
ac27a0ec DK |
2327 | GFP_KERNEL); |
2328 | if (sbi->s_group_desc == NULL) { | |
2b2d6d01 | 2329 | printk(KERN_ERR "EXT4-fs: not enough memory\n"); |
ac27a0ec DK |
2330 | goto failed_mount; |
2331 | } | |
2332 | ||
3244fcb1 | 2333 | #ifdef CONFIG_PROC_FS |
9f6200bb TT |
2334 | if (ext4_proc_root) |
2335 | sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root); | |
2336 | ||
240799cd TT |
2337 | if (sbi->s_proc) |
2338 | proc_create_data("inode_readahead_blks", 0644, sbi->s_proc, | |
2339 | &ext4_ui_proc_fops, | |
2340 | &sbi->s_inode_readahead_blks); | |
3244fcb1 | 2341 | #endif |
240799cd | 2342 | |
705895b6 | 2343 | bgl_lock_init(sbi->s_blockgroup_lock); |
ac27a0ec DK |
2344 | |
2345 | for (i = 0; i < db_count; i++) { | |
70bbb3e0 | 2346 | block = descriptor_loc(sb, logical_sb_block, i); |
ac27a0ec DK |
2347 | sbi->s_group_desc[i] = sb_bread(sb, block); |
2348 | if (!sbi->s_group_desc[i]) { | |
2b2d6d01 TT |
2349 | printk(KERN_ERR "EXT4-fs: " |
2350 | "can't read group descriptor %d\n", i); | |
ac27a0ec DK |
2351 | db_count = i; |
2352 | goto failed_mount2; | |
2353 | } | |
2354 | } | |
2b2d6d01 | 2355 | if (!ext4_check_descriptors(sb)) { |
617ba13b | 2356 | printk(KERN_ERR "EXT4-fs: group descriptors corrupted!\n"); |
ac27a0ec DK |
2357 | goto failed_mount2; |
2358 | } | |
772cb7c8 JS |
2359 | if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG)) |
2360 | if (!ext4_fill_flex_info(sb)) { | |
2361 | printk(KERN_ERR | |
2362 | "EXT4-fs: unable to initialize " | |
2363 | "flex_bg meta info!\n"); | |
2364 | goto failed_mount2; | |
2365 | } | |
2366 | ||
ac27a0ec DK |
2367 | sbi->s_gdb_count = db_count; |
2368 | get_random_bytes(&sbi->s_next_generation, sizeof(u32)); | |
2369 | spin_lock_init(&sbi->s_next_gen_lock); | |
2370 | ||
833f4077 PZ |
2371 | err = percpu_counter_init(&sbi->s_freeblocks_counter, |
2372 | ext4_count_free_blocks(sb)); | |
2373 | if (!err) { | |
2374 | err = percpu_counter_init(&sbi->s_freeinodes_counter, | |
2375 | ext4_count_free_inodes(sb)); | |
2376 | } | |
2377 | if (!err) { | |
2378 | err = percpu_counter_init(&sbi->s_dirs_counter, | |
2379 | ext4_count_dirs(sb)); | |
2380 | } | |
6bc6e63f AK |
2381 | if (!err) { |
2382 | err = percpu_counter_init(&sbi->s_dirtyblocks_counter, 0); | |
2383 | } | |
833f4077 PZ |
2384 | if (err) { |
2385 | printk(KERN_ERR "EXT4-fs: insufficient memory\n"); | |
2386 | goto failed_mount3; | |
2387 | } | |
ac27a0ec | 2388 | |
c9de560d AT |
2389 | sbi->s_stripe = ext4_get_stripe_size(sbi); |
2390 | ||
ac27a0ec DK |
2391 | /* |
2392 | * set up enough so that it can read an inode | |
2393 | */ | |
617ba13b MC |
2394 | sb->s_op = &ext4_sops; |
2395 | sb->s_export_op = &ext4_export_ops; | |
2396 | sb->s_xattr = ext4_xattr_handlers; | |
ac27a0ec | 2397 | #ifdef CONFIG_QUOTA |
617ba13b MC |
2398 | sb->s_qcop = &ext4_qctl_operations; |
2399 | sb->dq_op = &ext4_quota_operations; | |
ac27a0ec DK |
2400 | #endif |
2401 | INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */ | |
2402 | ||
2403 | sb->s_root = NULL; | |
2404 | ||
2405 | needs_recovery = (es->s_last_orphan != 0 || | |
617ba13b MC |
2406 | EXT4_HAS_INCOMPAT_FEATURE(sb, |
2407 | EXT4_FEATURE_INCOMPAT_RECOVER)); | |
ac27a0ec DK |
2408 | |
2409 | /* | |
2410 | * The first inode we look at is the journal inode. Don't try | |
2411 | * root first: it may be modified in the journal! | |
2412 | */ | |
2413 | if (!test_opt(sb, NOLOAD) && | |
617ba13b MC |
2414 | EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) { |
2415 | if (ext4_load_journal(sb, es, journal_devnum)) | |
ac27a0ec | 2416 | goto failed_mount3; |
624080ed TT |
2417 | if (!(sb->s_flags & MS_RDONLY) && |
2418 | EXT4_SB(sb)->s_journal->j_failed_commit) { | |
2419 | printk(KERN_CRIT "EXT4-fs error (device %s): " | |
2420 | "ext4_fill_super: Journal transaction " | |
2b2d6d01 | 2421 | "%u is corrupt\n", sb->s_id, |
624080ed | 2422 | EXT4_SB(sb)->s_journal->j_failed_commit); |
2b2d6d01 TT |
2423 | if (test_opt(sb, ERRORS_RO)) { |
2424 | printk(KERN_CRIT | |
2425 | "Mounting filesystem read-only\n"); | |
624080ed TT |
2426 | sb->s_flags |= MS_RDONLY; |
2427 | EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; | |
2428 | es->s_state |= cpu_to_le16(EXT4_ERROR_FS); | |
2429 | } | |
2430 | if (test_opt(sb, ERRORS_PANIC)) { | |
2431 | EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; | |
2432 | es->s_state |= cpu_to_le16(EXT4_ERROR_FS); | |
2433 | ext4_commit_super(sb, es, 1); | |
624080ed TT |
2434 | goto failed_mount4; |
2435 | } | |
2436 | } | |
0390131b FM |
2437 | } else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) && |
2438 | EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) { | |
2439 | printk(KERN_ERR "EXT4-fs: required journal recovery " | |
2440 | "suppressed and not mounted read-only\n"); | |
2441 | goto failed_mount4; | |
ac27a0ec | 2442 | } else { |
0390131b FM |
2443 | clear_opt(sbi->s_mount_opt, DATA_FLAGS); |
2444 | set_opt(sbi->s_mount_opt, WRITEBACK_DATA); | |
2445 | sbi->s_journal = NULL; | |
2446 | needs_recovery = 0; | |
2447 | goto no_journal; | |
ac27a0ec DK |
2448 | } |
2449 | ||
eb40a09c JS |
2450 | if (ext4_blocks_count(es) > 0xffffffffULL && |
2451 | !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0, | |
2452 | JBD2_FEATURE_INCOMPAT_64BIT)) { | |
abda1418 | 2453 | printk(KERN_ERR "EXT4-fs: Failed to set 64-bit journal feature\n"); |
eb40a09c JS |
2454 | goto failed_mount4; |
2455 | } | |
2456 | ||
818d276c GS |
2457 | if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) { |
2458 | jbd2_journal_set_features(sbi->s_journal, | |
2459 | JBD2_FEATURE_COMPAT_CHECKSUM, 0, | |
2460 | JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT); | |
2461 | } else if (test_opt(sb, JOURNAL_CHECKSUM)) { | |
2462 | jbd2_journal_set_features(sbi->s_journal, | |
2463 | JBD2_FEATURE_COMPAT_CHECKSUM, 0, 0); | |
2464 | jbd2_journal_clear_features(sbi->s_journal, 0, 0, | |
2465 | JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT); | |
2466 | } else { | |
2467 | jbd2_journal_clear_features(sbi->s_journal, | |
2468 | JBD2_FEATURE_COMPAT_CHECKSUM, 0, | |
2469 | JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT); | |
2470 | } | |
2471 | ||
ac27a0ec DK |
2472 | /* We have now updated the journal if required, so we can |
2473 | * validate the data journaling mode. */ | |
2474 | switch (test_opt(sb, DATA_FLAGS)) { | |
2475 | case 0: | |
2476 | /* No mode set, assume a default based on the journal | |
63f57933 AM |
2477 | * capabilities: ORDERED_DATA if the journal can |
2478 | * cope, else JOURNAL_DATA | |
2479 | */ | |
dab291af MC |
2480 | if (jbd2_journal_check_available_features |
2481 | (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) | |
ac27a0ec DK |
2482 | set_opt(sbi->s_mount_opt, ORDERED_DATA); |
2483 | else | |
2484 | set_opt(sbi->s_mount_opt, JOURNAL_DATA); | |
2485 | break; | |
2486 | ||
617ba13b MC |
2487 | case EXT4_MOUNT_ORDERED_DATA: |
2488 | case EXT4_MOUNT_WRITEBACK_DATA: | |
dab291af MC |
2489 | if (!jbd2_journal_check_available_features |
2490 | (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) { | |
617ba13b | 2491 | printk(KERN_ERR "EXT4-fs: Journal does not support " |
ac27a0ec DK |
2492 | "requested data journaling mode\n"); |
2493 | goto failed_mount4; | |
2494 | } | |
2495 | default: | |
2496 | break; | |
2497 | } | |
b3881f74 | 2498 | set_task_ioprio(sbi->s_journal->j_task, journal_ioprio); |
ac27a0ec | 2499 | |
0390131b | 2500 | no_journal: |
ac27a0ec DK |
2501 | |
2502 | if (test_opt(sb, NOBH)) { | |
617ba13b MC |
2503 | if (!(test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)) { |
2504 | printk(KERN_WARNING "EXT4-fs: Ignoring nobh option - " | |
ac27a0ec DK |
2505 | "its supported only with writeback mode\n"); |
2506 | clear_opt(sbi->s_mount_opt, NOBH); | |
2507 | } | |
2508 | } | |
2509 | /* | |
dab291af | 2510 | * The jbd2_journal_load will have done any necessary log recovery, |
ac27a0ec DK |
2511 | * so we can safely mount the rest of the filesystem now. |
2512 | */ | |
2513 | ||
1d1fe1ee DH |
2514 | root = ext4_iget(sb, EXT4_ROOT_INO); |
2515 | if (IS_ERR(root)) { | |
617ba13b | 2516 | printk(KERN_ERR "EXT4-fs: get root inode failed\n"); |
1d1fe1ee | 2517 | ret = PTR_ERR(root); |
ac27a0ec DK |
2518 | goto failed_mount4; |
2519 | } | |
2520 | if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { | |
1d1fe1ee | 2521 | iput(root); |
617ba13b | 2522 | printk(KERN_ERR "EXT4-fs: corrupt root inode, run e2fsck\n"); |
ac27a0ec DK |
2523 | goto failed_mount4; |
2524 | } | |
1d1fe1ee DH |
2525 | sb->s_root = d_alloc_root(root); |
2526 | if (!sb->s_root) { | |
2527 | printk(KERN_ERR "EXT4-fs: get root dentry failed\n"); | |
2528 | iput(root); | |
2529 | ret = -ENOMEM; | |
2530 | goto failed_mount4; | |
2531 | } | |
ac27a0ec | 2532 | |
2b2d6d01 | 2533 | ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY); |
ef7f3835 KS |
2534 | |
2535 | /* determine the minimum size of new large inodes, if present */ | |
2536 | if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) { | |
2537 | sbi->s_want_extra_isize = sizeof(struct ext4_inode) - | |
2538 | EXT4_GOOD_OLD_INODE_SIZE; | |
2539 | if (EXT4_HAS_RO_COMPAT_FEATURE(sb, | |
2540 | EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) { | |
2541 | if (sbi->s_want_extra_isize < | |
2542 | le16_to_cpu(es->s_want_extra_isize)) | |
2543 | sbi->s_want_extra_isize = | |
2544 | le16_to_cpu(es->s_want_extra_isize); | |
2545 | if (sbi->s_want_extra_isize < | |
2546 | le16_to_cpu(es->s_min_extra_isize)) | |
2547 | sbi->s_want_extra_isize = | |
2548 | le16_to_cpu(es->s_min_extra_isize); | |
2549 | } | |
2550 | } | |
2551 | /* Check if enough inode space is available */ | |
2552 | if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize > | |
2553 | sbi->s_inode_size) { | |
2554 | sbi->s_want_extra_isize = sizeof(struct ext4_inode) - | |
2555 | EXT4_GOOD_OLD_INODE_SIZE; | |
2556 | printk(KERN_INFO "EXT4-fs: required extra inode space not" | |
2557 | "available.\n"); | |
2558 | } | |
2559 | ||
c2774d84 AK |
2560 | if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) { |
2561 | printk(KERN_WARNING "EXT4-fs: Ignoring delalloc option - " | |
2562 | "requested data journaling mode\n"); | |
2563 | clear_opt(sbi->s_mount_opt, DELALLOC); | |
2564 | } else if (test_opt(sb, DELALLOC)) | |
2565 | printk(KERN_INFO "EXT4-fs: delayed allocation enabled\n"); | |
2566 | ||
2567 | ext4_ext_init(sb); | |
2568 | err = ext4_mb_init(sb, needs_recovery); | |
2569 | if (err) { | |
2570 | printk(KERN_ERR "EXT4-fs: failed to initalize mballoc (%d)\n", | |
2571 | err); | |
2572 | goto failed_mount4; | |
2573 | } | |
2574 | ||
ac27a0ec DK |
2575 | /* |
2576 | * akpm: core read_super() calls in here with the superblock locked. | |
2577 | * That deadlocks, because orphan cleanup needs to lock the superblock | |
2578 | * in numerous places. Here we just pop the lock - it's relatively | |
2579 | * harmless, because we are now ready to accept write_super() requests, | |
2580 | * and aviro says that's the only reason for hanging onto the | |
2581 | * superblock lock. | |
2582 | */ | |
617ba13b MC |
2583 | EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS; |
2584 | ext4_orphan_cleanup(sb, es); | |
2585 | EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS; | |
0390131b | 2586 | if (needs_recovery) { |
2b2d6d01 | 2587 | printk(KERN_INFO "EXT4-fs: recovery complete.\n"); |
0390131b FM |
2588 | ext4_mark_recovery_complete(sb, es); |
2589 | } | |
2590 | if (EXT4_SB(sb)->s_journal) { | |
2591 | if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) | |
2592 | descr = " journalled data mode"; | |
2593 | else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) | |
2594 | descr = " ordered data mode"; | |
2595 | else | |
2596 | descr = " writeback data mode"; | |
2597 | } else | |
2598 | descr = "out journal"; | |
2599 | ||
2600 | printk(KERN_INFO "EXT4-fs: mounted filesystem %s with%s\n", | |
2601 | sb->s_id, descr); | |
ac27a0ec DK |
2602 | |
2603 | lock_kernel(); | |
2604 | return 0; | |
2605 | ||
617ba13b | 2606 | cantfind_ext4: |
ac27a0ec | 2607 | if (!silent) |
617ba13b | 2608 | printk(KERN_ERR "VFS: Can't find ext4 filesystem on dev %s.\n", |
ac27a0ec DK |
2609 | sb->s_id); |
2610 | goto failed_mount; | |
2611 | ||
2612 | failed_mount4: | |
0390131b FM |
2613 | printk(KERN_ERR "EXT4-fs (device %s): mount failed\n", sb->s_id); |
2614 | if (sbi->s_journal) { | |
2615 | jbd2_journal_destroy(sbi->s_journal); | |
2616 | sbi->s_journal = NULL; | |
2617 | } | |
ac27a0ec DK |
2618 | failed_mount3: |
2619 | percpu_counter_destroy(&sbi->s_freeblocks_counter); | |
2620 | percpu_counter_destroy(&sbi->s_freeinodes_counter); | |
2621 | percpu_counter_destroy(&sbi->s_dirs_counter); | |
6bc6e63f | 2622 | percpu_counter_destroy(&sbi->s_dirtyblocks_counter); |
ac27a0ec DK |
2623 | failed_mount2: |
2624 | for (i = 0; i < db_count; i++) | |
2625 | brelse(sbi->s_group_desc[i]); | |
2626 | kfree(sbi->s_group_desc); | |
2627 | failed_mount: | |
240799cd TT |
2628 | if (sbi->s_proc) { |
2629 | remove_proc_entry("inode_readahead_blks", sbi->s_proc); | |
9f6200bb | 2630 | remove_proc_entry(sb->s_id, ext4_proc_root); |
240799cd | 2631 | } |
ac27a0ec DK |
2632 | #ifdef CONFIG_QUOTA |
2633 | for (i = 0; i < MAXQUOTAS; i++) | |
2634 | kfree(sbi->s_qf_names[i]); | |
2635 | #endif | |
617ba13b | 2636 | ext4_blkdev_remove(sbi); |
ac27a0ec DK |
2637 | brelse(bh); |
2638 | out_fail: | |
2639 | sb->s_fs_info = NULL; | |
2640 | kfree(sbi); | |
2641 | lock_kernel(); | |
1d1fe1ee | 2642 | return ret; |
ac27a0ec DK |
2643 | } |
2644 | ||
2645 | /* | |
2646 | * Setup any per-fs journal parameters now. We'll do this both on | |
2647 | * initial mount, once the journal has been initialised but before we've | |
2648 | * done any recovery; and again on any subsequent remount. | |
2649 | */ | |
617ba13b | 2650 | static void ext4_init_journal_params(struct super_block *sb, journal_t *journal) |
ac27a0ec | 2651 | { |
617ba13b | 2652 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
ac27a0ec | 2653 | |
30773840 TT |
2654 | journal->j_commit_interval = sbi->s_commit_interval; |
2655 | journal->j_min_batch_time = sbi->s_min_batch_time; | |
2656 | journal->j_max_batch_time = sbi->s_max_batch_time; | |
ac27a0ec DK |
2657 | |
2658 | spin_lock(&journal->j_state_lock); | |
2659 | if (test_opt(sb, BARRIER)) | |
dab291af | 2660 | journal->j_flags |= JBD2_BARRIER; |
ac27a0ec | 2661 | else |
dab291af | 2662 | journal->j_flags &= ~JBD2_BARRIER; |
5bf5683a HK |
2663 | if (test_opt(sb, DATA_ERR_ABORT)) |
2664 | journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR; | |
2665 | else | |
2666 | journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR; | |
ac27a0ec DK |
2667 | spin_unlock(&journal->j_state_lock); |
2668 | } | |
2669 | ||
617ba13b | 2670 | static journal_t *ext4_get_journal(struct super_block *sb, |
ac27a0ec DK |
2671 | unsigned int journal_inum) |
2672 | { | |
2673 | struct inode *journal_inode; | |
2674 | journal_t *journal; | |
2675 | ||
0390131b FM |
2676 | BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)); |
2677 | ||
ac27a0ec DK |
2678 | /* First, test for the existence of a valid inode on disk. Bad |
2679 | * things happen if we iget() an unused inode, as the subsequent | |
2680 | * iput() will try to delete it. */ | |
2681 | ||
1d1fe1ee DH |
2682 | journal_inode = ext4_iget(sb, journal_inum); |
2683 | if (IS_ERR(journal_inode)) { | |
617ba13b | 2684 | printk(KERN_ERR "EXT4-fs: no journal found.\n"); |
ac27a0ec DK |
2685 | return NULL; |
2686 | } | |
2687 | if (!journal_inode->i_nlink) { | |
2688 | make_bad_inode(journal_inode); | |
2689 | iput(journal_inode); | |
617ba13b | 2690 | printk(KERN_ERR "EXT4-fs: journal inode is deleted.\n"); |
ac27a0ec DK |
2691 | return NULL; |
2692 | } | |
2693 | ||
e5f8eab8 | 2694 | jbd_debug(2, "Journal inode found at %p: %lld bytes\n", |
ac27a0ec | 2695 | journal_inode, journal_inode->i_size); |
1d1fe1ee | 2696 | if (!S_ISREG(journal_inode->i_mode)) { |
617ba13b | 2697 | printk(KERN_ERR "EXT4-fs: invalid journal inode.\n"); |
ac27a0ec DK |
2698 | iput(journal_inode); |
2699 | return NULL; | |
2700 | } | |
2701 | ||
dab291af | 2702 | journal = jbd2_journal_init_inode(journal_inode); |
ac27a0ec | 2703 | if (!journal) { |
617ba13b | 2704 | printk(KERN_ERR "EXT4-fs: Could not load journal inode\n"); |
ac27a0ec DK |
2705 | iput(journal_inode); |
2706 | return NULL; | |
2707 | } | |
2708 | journal->j_private = sb; | |
617ba13b | 2709 | ext4_init_journal_params(sb, journal); |
ac27a0ec DK |
2710 | return journal; |
2711 | } | |
2712 | ||
617ba13b | 2713 | static journal_t *ext4_get_dev_journal(struct super_block *sb, |
ac27a0ec DK |
2714 | dev_t j_dev) |
2715 | { | |
2b2d6d01 | 2716 | struct buffer_head *bh; |
ac27a0ec | 2717 | journal_t *journal; |
617ba13b MC |
2718 | ext4_fsblk_t start; |
2719 | ext4_fsblk_t len; | |
ac27a0ec | 2720 | int hblock, blocksize; |
617ba13b | 2721 | ext4_fsblk_t sb_block; |
ac27a0ec | 2722 | unsigned long offset; |
2b2d6d01 | 2723 | struct ext4_super_block *es; |
ac27a0ec DK |
2724 | struct block_device *bdev; |
2725 | ||
0390131b FM |
2726 | BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)); |
2727 | ||
617ba13b | 2728 | bdev = ext4_blkdev_get(j_dev); |
ac27a0ec DK |
2729 | if (bdev == NULL) |
2730 | return NULL; | |
2731 | ||
2732 | if (bd_claim(bdev, sb)) { | |
2733 | printk(KERN_ERR | |
abda1418 | 2734 | "EXT4-fs: failed to claim external journal device.\n"); |
9a1c3542 | 2735 | blkdev_put(bdev, FMODE_READ|FMODE_WRITE); |
ac27a0ec DK |
2736 | return NULL; |
2737 | } | |
2738 | ||
2739 | blocksize = sb->s_blocksize; | |
2740 | hblock = bdev_hardsect_size(bdev); | |
2741 | if (blocksize < hblock) { | |
2742 | printk(KERN_ERR | |
617ba13b | 2743 | "EXT4-fs: blocksize too small for journal device.\n"); |
ac27a0ec DK |
2744 | goto out_bdev; |
2745 | } | |
2746 | ||
617ba13b MC |
2747 | sb_block = EXT4_MIN_BLOCK_SIZE / blocksize; |
2748 | offset = EXT4_MIN_BLOCK_SIZE % blocksize; | |
ac27a0ec DK |
2749 | set_blocksize(bdev, blocksize); |
2750 | if (!(bh = __bread(bdev, sb_block, blocksize))) { | |
617ba13b | 2751 | printk(KERN_ERR "EXT4-fs: couldn't read superblock of " |
ac27a0ec DK |
2752 | "external journal\n"); |
2753 | goto out_bdev; | |
2754 | } | |
2755 | ||
617ba13b MC |
2756 | es = (struct ext4_super_block *) (((char *)bh->b_data) + offset); |
2757 | if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) || | |
ac27a0ec | 2758 | !(le32_to_cpu(es->s_feature_incompat) & |
617ba13b MC |
2759 | EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) { |
2760 | printk(KERN_ERR "EXT4-fs: external journal has " | |
ac27a0ec DK |
2761 | "bad superblock\n"); |
2762 | brelse(bh); | |
2763 | goto out_bdev; | |
2764 | } | |
2765 | ||
617ba13b MC |
2766 | if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) { |
2767 | printk(KERN_ERR "EXT4-fs: journal UUID does not match\n"); | |
ac27a0ec DK |
2768 | brelse(bh); |
2769 | goto out_bdev; | |
2770 | } | |
2771 | ||
bd81d8ee | 2772 | len = ext4_blocks_count(es); |
ac27a0ec DK |
2773 | start = sb_block + 1; |
2774 | brelse(bh); /* we're done with the superblock */ | |
2775 | ||
dab291af | 2776 | journal = jbd2_journal_init_dev(bdev, sb->s_bdev, |
ac27a0ec DK |
2777 | start, len, blocksize); |
2778 | if (!journal) { | |
617ba13b | 2779 | printk(KERN_ERR "EXT4-fs: failed to create device journal\n"); |
ac27a0ec DK |
2780 | goto out_bdev; |
2781 | } | |
2782 | journal->j_private = sb; | |
2783 | ll_rw_block(READ, 1, &journal->j_sb_buffer); | |
2784 | wait_on_buffer(journal->j_sb_buffer); | |
2785 | if (!buffer_uptodate(journal->j_sb_buffer)) { | |
617ba13b | 2786 | printk(KERN_ERR "EXT4-fs: I/O error on journal device\n"); |
ac27a0ec DK |
2787 | goto out_journal; |
2788 | } | |
2789 | if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) { | |
617ba13b | 2790 | printk(KERN_ERR "EXT4-fs: External journal has more than one " |
ac27a0ec DK |
2791 | "user (unsupported) - %d\n", |
2792 | be32_to_cpu(journal->j_superblock->s_nr_users)); | |
2793 | goto out_journal; | |
2794 | } | |
617ba13b MC |
2795 | EXT4_SB(sb)->journal_bdev = bdev; |
2796 | ext4_init_journal_params(sb, journal); | |
ac27a0ec DK |
2797 | return journal; |
2798 | out_journal: | |
dab291af | 2799 | jbd2_journal_destroy(journal); |
ac27a0ec | 2800 | out_bdev: |
617ba13b | 2801 | ext4_blkdev_put(bdev); |
ac27a0ec DK |
2802 | return NULL; |
2803 | } | |
2804 | ||
617ba13b MC |
2805 | static int ext4_load_journal(struct super_block *sb, |
2806 | struct ext4_super_block *es, | |
ac27a0ec DK |
2807 | unsigned long journal_devnum) |
2808 | { | |
2809 | journal_t *journal; | |
2810 | unsigned int journal_inum = le32_to_cpu(es->s_journal_inum); | |
2811 | dev_t journal_dev; | |
2812 | int err = 0; | |
2813 | int really_read_only; | |
2814 | ||
0390131b FM |
2815 | BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)); |
2816 | ||
ac27a0ec DK |
2817 | if (journal_devnum && |
2818 | journal_devnum != le32_to_cpu(es->s_journal_dev)) { | |
617ba13b | 2819 | printk(KERN_INFO "EXT4-fs: external journal device major/minor " |
ac27a0ec DK |
2820 | "numbers have changed\n"); |
2821 | journal_dev = new_decode_dev(journal_devnum); | |
2822 | } else | |
2823 | journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev)); | |
2824 | ||
2825 | really_read_only = bdev_read_only(sb->s_bdev); | |
2826 | ||
2827 | /* | |
2828 | * Are we loading a blank journal or performing recovery after a | |
2829 | * crash? For recovery, we need to check in advance whether we | |
2830 | * can get read-write access to the device. | |
2831 | */ | |
2832 | ||
617ba13b | 2833 | if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) { |
ac27a0ec | 2834 | if (sb->s_flags & MS_RDONLY) { |
617ba13b | 2835 | printk(KERN_INFO "EXT4-fs: INFO: recovery " |
ac27a0ec DK |
2836 | "required on readonly filesystem.\n"); |
2837 | if (really_read_only) { | |
617ba13b | 2838 | printk(KERN_ERR "EXT4-fs: write access " |
ac27a0ec DK |
2839 | "unavailable, cannot proceed.\n"); |
2840 | return -EROFS; | |
2841 | } | |
2b2d6d01 TT |
2842 | printk(KERN_INFO "EXT4-fs: write access will " |
2843 | "be enabled during recovery.\n"); | |
ac27a0ec DK |
2844 | } |
2845 | } | |
2846 | ||
2847 | if (journal_inum && journal_dev) { | |
617ba13b | 2848 | printk(KERN_ERR "EXT4-fs: filesystem has both journal " |
ac27a0ec DK |
2849 | "and inode journals!\n"); |
2850 | return -EINVAL; | |
2851 | } | |
2852 | ||
2853 | if (journal_inum) { | |
617ba13b | 2854 | if (!(journal = ext4_get_journal(sb, journal_inum))) |
ac27a0ec DK |
2855 | return -EINVAL; |
2856 | } else { | |
617ba13b | 2857 | if (!(journal = ext4_get_dev_journal(sb, journal_dev))) |
ac27a0ec DK |
2858 | return -EINVAL; |
2859 | } | |
2860 | ||
4776004f TT |
2861 | if (journal->j_flags & JBD2_BARRIER) |
2862 | printk(KERN_INFO "EXT4-fs: barriers enabled\n"); | |
2863 | else | |
2864 | printk(KERN_INFO "EXT4-fs: barriers disabled\n"); | |
2865 | ||
ac27a0ec | 2866 | if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) { |
dab291af | 2867 | err = jbd2_journal_update_format(journal); |
ac27a0ec | 2868 | if (err) { |
617ba13b | 2869 | printk(KERN_ERR "EXT4-fs: error updating journal.\n"); |
dab291af | 2870 | jbd2_journal_destroy(journal); |
ac27a0ec DK |
2871 | return err; |
2872 | } | |
2873 | } | |
2874 | ||
617ba13b | 2875 | if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) |
dab291af | 2876 | err = jbd2_journal_wipe(journal, !really_read_only); |
ac27a0ec | 2877 | if (!err) |
dab291af | 2878 | err = jbd2_journal_load(journal); |
ac27a0ec DK |
2879 | |
2880 | if (err) { | |
617ba13b | 2881 | printk(KERN_ERR "EXT4-fs: error loading journal.\n"); |
dab291af | 2882 | jbd2_journal_destroy(journal); |
ac27a0ec DK |
2883 | return err; |
2884 | } | |
2885 | ||
617ba13b MC |
2886 | EXT4_SB(sb)->s_journal = journal; |
2887 | ext4_clear_journal_err(sb, es); | |
ac27a0ec DK |
2888 | |
2889 | if (journal_devnum && | |
2890 | journal_devnum != le32_to_cpu(es->s_journal_dev)) { | |
2891 | es->s_journal_dev = cpu_to_le32(journal_devnum); | |
2892 | sb->s_dirt = 1; | |
2893 | ||
2894 | /* Make sure we flush the recovery flag to disk. */ | |
617ba13b | 2895 | ext4_commit_super(sb, es, 1); |
ac27a0ec DK |
2896 | } |
2897 | ||
2898 | return 0; | |
2899 | } | |
2900 | ||
c4be0c1d | 2901 | static int ext4_commit_super(struct super_block *sb, |
2b2d6d01 | 2902 | struct ext4_super_block *es, int sync) |
ac27a0ec | 2903 | { |
617ba13b | 2904 | struct buffer_head *sbh = EXT4_SB(sb)->s_sbh; |
c4be0c1d | 2905 | int error = 0; |
ac27a0ec DK |
2906 | |
2907 | if (!sbh) | |
c4be0c1d | 2908 | return error; |
914258bf TT |
2909 | if (buffer_write_io_error(sbh)) { |
2910 | /* | |
2911 | * Oh, dear. A previous attempt to write the | |
2912 | * superblock failed. This could happen because the | |
2913 | * USB device was yanked out. Or it could happen to | |
2914 | * be a transient write error and maybe the block will | |
2915 | * be remapped. Nothing we can do but to retry the | |
2916 | * write and hope for the best. | |
2917 | */ | |
abda1418 | 2918 | printk(KERN_ERR "EXT4-fs: previous I/O error to " |
914258bf TT |
2919 | "superblock detected for %s.\n", sb->s_id); |
2920 | clear_buffer_write_io_error(sbh); | |
2921 | set_buffer_uptodate(sbh); | |
2922 | } | |
ac27a0ec | 2923 | es->s_wtime = cpu_to_le32(get_seconds()); |
5d1b1b3f AK |
2924 | ext4_free_blocks_count_set(es, percpu_counter_sum_positive( |
2925 | &EXT4_SB(sb)->s_freeblocks_counter)); | |
2926 | es->s_free_inodes_count = cpu_to_le32(percpu_counter_sum_positive( | |
2927 | &EXT4_SB(sb)->s_freeinodes_counter)); | |
2928 | ||
ac27a0ec DK |
2929 | BUFFER_TRACE(sbh, "marking dirty"); |
2930 | mark_buffer_dirty(sbh); | |
914258bf | 2931 | if (sync) { |
c4be0c1d TS |
2932 | error = sync_dirty_buffer(sbh); |
2933 | if (error) | |
2934 | return error; | |
2935 | ||
2936 | error = buffer_write_io_error(sbh); | |
2937 | if (error) { | |
abda1418 | 2938 | printk(KERN_ERR "EXT4-fs: I/O error while writing " |
914258bf TT |
2939 | "superblock for %s.\n", sb->s_id); |
2940 | clear_buffer_write_io_error(sbh); | |
2941 | set_buffer_uptodate(sbh); | |
2942 | } | |
2943 | } | |
c4be0c1d | 2944 | return error; |
ac27a0ec DK |
2945 | } |
2946 | ||
2947 | ||
2948 | /* | |
2949 | * Have we just finished recovery? If so, and if we are mounting (or | |
2950 | * remounting) the filesystem readonly, then we will end up with a | |
2951 | * consistent fs on disk. Record that fact. | |
2952 | */ | |
2b2d6d01 TT |
2953 | static void ext4_mark_recovery_complete(struct super_block *sb, |
2954 | struct ext4_super_block *es) | |
ac27a0ec | 2955 | { |
617ba13b | 2956 | journal_t *journal = EXT4_SB(sb)->s_journal; |
ac27a0ec | 2957 | |
0390131b FM |
2958 | if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) { |
2959 | BUG_ON(journal != NULL); | |
2960 | return; | |
2961 | } | |
dab291af | 2962 | jbd2_journal_lock_updates(journal); |
7ffe1ea8 HK |
2963 | if (jbd2_journal_flush(journal) < 0) |
2964 | goto out; | |
2965 | ||
32c37730 | 2966 | lock_super(sb); |
617ba13b | 2967 | if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) && |
ac27a0ec | 2968 | sb->s_flags & MS_RDONLY) { |
617ba13b | 2969 | EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); |
ac27a0ec | 2970 | sb->s_dirt = 0; |
617ba13b | 2971 | ext4_commit_super(sb, es, 1); |
ac27a0ec | 2972 | } |
32c37730 | 2973 | unlock_super(sb); |
7ffe1ea8 HK |
2974 | |
2975 | out: | |
dab291af | 2976 | jbd2_journal_unlock_updates(journal); |
ac27a0ec DK |
2977 | } |
2978 | ||
2979 | /* | |
2980 | * If we are mounting (or read-write remounting) a filesystem whose journal | |
2981 | * has recorded an error from a previous lifetime, move that error to the | |
2982 | * main filesystem now. | |
2983 | */ | |
2b2d6d01 TT |
2984 | static void ext4_clear_journal_err(struct super_block *sb, |
2985 | struct ext4_super_block *es) | |
ac27a0ec DK |
2986 | { |
2987 | journal_t *journal; | |
2988 | int j_errno; | |
2989 | const char *errstr; | |
2990 | ||
0390131b FM |
2991 | BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)); |
2992 | ||
617ba13b | 2993 | journal = EXT4_SB(sb)->s_journal; |
ac27a0ec DK |
2994 | |
2995 | /* | |
2996 | * Now check for any error status which may have been recorded in the | |
617ba13b | 2997 | * journal by a prior ext4_error() or ext4_abort() |
ac27a0ec DK |
2998 | */ |
2999 | ||
dab291af | 3000 | j_errno = jbd2_journal_errno(journal); |
ac27a0ec DK |
3001 | if (j_errno) { |
3002 | char nbuf[16]; | |
3003 | ||
617ba13b | 3004 | errstr = ext4_decode_error(sb, j_errno, nbuf); |
46e665e9 | 3005 | ext4_warning(sb, __func__, "Filesystem error recorded " |
ac27a0ec | 3006 | "from previous mount: %s", errstr); |
46e665e9 | 3007 | ext4_warning(sb, __func__, "Marking fs in need of " |
ac27a0ec DK |
3008 | "filesystem check."); |
3009 | ||
617ba13b MC |
3010 | EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; |
3011 | es->s_state |= cpu_to_le16(EXT4_ERROR_FS); | |
2b2d6d01 | 3012 | ext4_commit_super(sb, es, 1); |
ac27a0ec | 3013 | |
dab291af | 3014 | jbd2_journal_clear_err(journal); |
ac27a0ec DK |
3015 | } |
3016 | } | |
3017 | ||
3018 | /* | |
3019 | * Force the running and committing transactions to commit, | |
3020 | * and wait on the commit. | |
3021 | */ | |
617ba13b | 3022 | int ext4_force_commit(struct super_block *sb) |
ac27a0ec DK |
3023 | { |
3024 | journal_t *journal; | |
0390131b | 3025 | int ret = 0; |
ac27a0ec DK |
3026 | |
3027 | if (sb->s_flags & MS_RDONLY) | |
3028 | return 0; | |
3029 | ||
617ba13b | 3030 | journal = EXT4_SB(sb)->s_journal; |
0390131b FM |
3031 | if (journal) { |
3032 | sb->s_dirt = 0; | |
3033 | ret = ext4_journal_force_commit(journal); | |
3034 | } | |
3035 | ||
ac27a0ec DK |
3036 | return ret; |
3037 | } | |
3038 | ||
3039 | /* | |
617ba13b | 3040 | * Ext4 always journals updates to the superblock itself, so we don't |
ac27a0ec | 3041 | * have to propagate any other updates to the superblock on disk at this |
14ce0cb4 TT |
3042 | * point. (We can probably nuke this function altogether, and remove |
3043 | * any mention to sb->s_dirt in all of fs/ext4; eventual cleanup...) | |
ac27a0ec | 3044 | */ |
2b2d6d01 | 3045 | static void ext4_write_super(struct super_block *sb) |
ac27a0ec | 3046 | { |
0390131b FM |
3047 | if (EXT4_SB(sb)->s_journal) { |
3048 | if (mutex_trylock(&sb->s_lock) != 0) | |
3049 | BUG(); | |
3050 | sb->s_dirt = 0; | |
3051 | } else { | |
3052 | ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1); | |
3053 | } | |
ac27a0ec DK |
3054 | } |
3055 | ||
617ba13b | 3056 | static int ext4_sync_fs(struct super_block *sb, int wait) |
ac27a0ec | 3057 | { |
14ce0cb4 | 3058 | int ret = 0; |
9eddacf9 | 3059 | tid_t target; |
ac27a0ec | 3060 | |
ede86cc4 | 3061 | trace_mark(ext4_sync_fs, "dev %s wait %d", sb->s_id, wait); |
ac27a0ec | 3062 | sb->s_dirt = 0; |
0390131b | 3063 | if (EXT4_SB(sb)->s_journal) { |
9eddacf9 JK |
3064 | if (jbd2_journal_start_commit(EXT4_SB(sb)->s_journal, |
3065 | &target)) { | |
3066 | if (wait) | |
3067 | jbd2_log_wait_commit(EXT4_SB(sb)->s_journal, | |
3068 | target); | |
3069 | } | |
0390131b FM |
3070 | } else { |
3071 | ext4_commit_super(sb, EXT4_SB(sb)->s_es, wait); | |
3072 | } | |
14ce0cb4 | 3073 | return ret; |
ac27a0ec DK |
3074 | } |
3075 | ||
3076 | /* | |
3077 | * LVM calls this function before a (read-only) snapshot is created. This | |
3078 | * gives us a chance to flush the journal completely and mark the fs clean. | |
3079 | */ | |
c4be0c1d | 3080 | static int ext4_freeze(struct super_block *sb) |
ac27a0ec | 3081 | { |
c4be0c1d TS |
3082 | int error = 0; |
3083 | journal_t *journal; | |
ac27a0ec DK |
3084 | sb->s_dirt = 0; |
3085 | ||
3086 | if (!(sb->s_flags & MS_RDONLY)) { | |
c4be0c1d | 3087 | journal = EXT4_SB(sb)->s_journal; |
ac27a0ec | 3088 | |
0390131b FM |
3089 | if (journal) { |
3090 | /* Now we set up the journal barrier. */ | |
3091 | jbd2_journal_lock_updates(journal); | |
7ffe1ea8 | 3092 | |
0390131b FM |
3093 | /* |
3094 | * We don't want to clear needs_recovery flag when we | |
3095 | * failed to flush the journal. | |
3096 | */ | |
c4be0c1d TS |
3097 | error = jbd2_journal_flush(journal); |
3098 | if (error < 0) | |
3099 | goto out; | |
0390131b | 3100 | } |
ac27a0ec DK |
3101 | |
3102 | /* Journal blocked and flushed, clear needs_recovery flag. */ | |
617ba13b | 3103 | EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); |
c4be0c1d TS |
3104 | error = ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1); |
3105 | if (error) | |
3106 | goto out; | |
ac27a0ec | 3107 | } |
c4be0c1d TS |
3108 | return 0; |
3109 | out: | |
3110 | jbd2_journal_unlock_updates(journal); | |
3111 | return error; | |
ac27a0ec DK |
3112 | } |
3113 | ||
3114 | /* | |
3115 | * Called by LVM after the snapshot is done. We need to reset the RECOVER | |
3116 | * flag here, even though the filesystem is not technically dirty yet. | |
3117 | */ | |
c4be0c1d | 3118 | static int ext4_unfreeze(struct super_block *sb) |
ac27a0ec | 3119 | { |
0390131b | 3120 | if (EXT4_SB(sb)->s_journal && !(sb->s_flags & MS_RDONLY)) { |
ac27a0ec DK |
3121 | lock_super(sb); |
3122 | /* Reser the needs_recovery flag before the fs is unlocked. */ | |
617ba13b MC |
3123 | EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); |
3124 | ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1); | |
ac27a0ec | 3125 | unlock_super(sb); |
dab291af | 3126 | jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); |
ac27a0ec | 3127 | } |
c4be0c1d | 3128 | return 0; |
ac27a0ec DK |
3129 | } |
3130 | ||
2b2d6d01 | 3131 | static int ext4_remount(struct super_block *sb, int *flags, char *data) |
ac27a0ec | 3132 | { |
2b2d6d01 | 3133 | struct ext4_super_block *es; |
617ba13b MC |
3134 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
3135 | ext4_fsblk_t n_blocks_count = 0; | |
ac27a0ec | 3136 | unsigned long old_sb_flags; |
617ba13b | 3137 | struct ext4_mount_options old_opts; |
8a266467 | 3138 | ext4_group_t g; |
b3881f74 | 3139 | unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO; |
ac27a0ec DK |
3140 | int err; |
3141 | #ifdef CONFIG_QUOTA | |
3142 | int i; | |
3143 | #endif | |
3144 | ||
3145 | /* Store the original options */ | |
3146 | old_sb_flags = sb->s_flags; | |
3147 | old_opts.s_mount_opt = sbi->s_mount_opt; | |
3148 | old_opts.s_resuid = sbi->s_resuid; | |
3149 | old_opts.s_resgid = sbi->s_resgid; | |
3150 | old_opts.s_commit_interval = sbi->s_commit_interval; | |
30773840 TT |
3151 | old_opts.s_min_batch_time = sbi->s_min_batch_time; |
3152 | old_opts.s_max_batch_time = sbi->s_max_batch_time; | |
ac27a0ec DK |
3153 | #ifdef CONFIG_QUOTA |
3154 | old_opts.s_jquota_fmt = sbi->s_jquota_fmt; | |
3155 | for (i = 0; i < MAXQUOTAS; i++) | |
3156 | old_opts.s_qf_names[i] = sbi->s_qf_names[i]; | |
3157 | #endif | |
b3881f74 TT |
3158 | if (sbi->s_journal && sbi->s_journal->j_task->io_context) |
3159 | journal_ioprio = sbi->s_journal->j_task->io_context->ioprio; | |
ac27a0ec DK |
3160 | |
3161 | /* | |
3162 | * Allow the "check" option to be passed as a remount option. | |
3163 | */ | |
b3881f74 TT |
3164 | if (!parse_options(data, sb, NULL, &journal_ioprio, |
3165 | &n_blocks_count, 1)) { | |
ac27a0ec DK |
3166 | err = -EINVAL; |
3167 | goto restore_opts; | |
3168 | } | |
3169 | ||
617ba13b | 3170 | if (sbi->s_mount_opt & EXT4_MOUNT_ABORT) |
46e665e9 | 3171 | ext4_abort(sb, __func__, "Abort forced by user"); |
ac27a0ec DK |
3172 | |
3173 | sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | | |
617ba13b | 3174 | ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0); |
ac27a0ec DK |
3175 | |
3176 | es = sbi->s_es; | |
3177 | ||
b3881f74 | 3178 | if (sbi->s_journal) { |
0390131b | 3179 | ext4_init_journal_params(sb, sbi->s_journal); |
b3881f74 TT |
3180 | set_task_ioprio(sbi->s_journal->j_task, journal_ioprio); |
3181 | } | |
ac27a0ec DK |
3182 | |
3183 | if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) || | |
bd81d8ee | 3184 | n_blocks_count > ext4_blocks_count(es)) { |
617ba13b | 3185 | if (sbi->s_mount_opt & EXT4_MOUNT_ABORT) { |
ac27a0ec DK |
3186 | err = -EROFS; |
3187 | goto restore_opts; | |
3188 | } | |
3189 | ||
3190 | if (*flags & MS_RDONLY) { | |
3191 | /* | |
3192 | * First of all, the unconditional stuff we have to do | |
3193 | * to disable replay of the journal when we next remount | |
3194 | */ | |
3195 | sb->s_flags |= MS_RDONLY; | |
3196 | ||
3197 | /* | |
3198 | * OK, test if we are remounting a valid rw partition | |
3199 | * readonly, and if so set the rdonly flag and then | |
3200 | * mark the partition as valid again. | |
3201 | */ | |
617ba13b MC |
3202 | if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) && |
3203 | (sbi->s_mount_state & EXT4_VALID_FS)) | |
ac27a0ec DK |
3204 | es->s_state = cpu_to_le16(sbi->s_mount_state); |
3205 | ||
32c37730 JK |
3206 | /* |
3207 | * We have to unlock super so that we can wait for | |
3208 | * transactions. | |
3209 | */ | |
0390131b FM |
3210 | if (sbi->s_journal) { |
3211 | unlock_super(sb); | |
3212 | ext4_mark_recovery_complete(sb, es); | |
3213 | lock_super(sb); | |
3214 | } | |
ac27a0ec | 3215 | } else { |
3a06d778 | 3216 | int ret; |
617ba13b MC |
3217 | if ((ret = EXT4_HAS_RO_COMPAT_FEATURE(sb, |
3218 | ~EXT4_FEATURE_RO_COMPAT_SUPP))) { | |
3219 | printk(KERN_WARNING "EXT4-fs: %s: couldn't " | |
ac27a0ec | 3220 | "remount RDWR because of unsupported " |
3a06d778 AK |
3221 | "optional features (%x).\n", sb->s_id, |
3222 | (le32_to_cpu(sbi->s_es->s_feature_ro_compat) & | |
3223 | ~EXT4_FEATURE_RO_COMPAT_SUPP)); | |
ac27a0ec DK |
3224 | err = -EROFS; |
3225 | goto restore_opts; | |
3226 | } | |
ead6596b | 3227 | |
8a266467 TT |
3228 | /* |
3229 | * Make sure the group descriptor checksums | |
3230 | * are sane. If they aren't, refuse to | |
3231 | * remount r/w. | |
3232 | */ | |
3233 | for (g = 0; g < sbi->s_groups_count; g++) { | |
3234 | struct ext4_group_desc *gdp = | |
3235 | ext4_get_group_desc(sb, g, NULL); | |
3236 | ||
3237 | if (!ext4_group_desc_csum_verify(sbi, g, gdp)) { | |
3238 | printk(KERN_ERR | |
3239 | "EXT4-fs: ext4_remount: " | |
a9df9a49 | 3240 | "Checksum for group %u failed (%u!=%u)\n", |
8a266467 TT |
3241 | g, le16_to_cpu(ext4_group_desc_csum(sbi, g, gdp)), |
3242 | le16_to_cpu(gdp->bg_checksum)); | |
3243 | err = -EINVAL; | |
3244 | goto restore_opts; | |
3245 | } | |
3246 | } | |
3247 | ||
ead6596b ES |
3248 | /* |
3249 | * If we have an unprocessed orphan list hanging | |
3250 | * around from a previously readonly bdev mount, | |
3251 | * require a full umount/remount for now. | |
3252 | */ | |
3253 | if (es->s_last_orphan) { | |
3254 | printk(KERN_WARNING "EXT4-fs: %s: couldn't " | |
3255 | "remount RDWR because of unprocessed " | |
3256 | "orphan inode list. Please " | |
3257 | "umount/remount instead.\n", | |
3258 | sb->s_id); | |
3259 | err = -EINVAL; | |
3260 | goto restore_opts; | |
3261 | } | |
3262 | ||
ac27a0ec DK |
3263 | /* |
3264 | * Mounting a RDONLY partition read-write, so reread | |
3265 | * and store the current valid flag. (It may have | |
3266 | * been changed by e2fsck since we originally mounted | |
3267 | * the partition.) | |
3268 | */ | |
0390131b FM |
3269 | if (sbi->s_journal) |
3270 | ext4_clear_journal_err(sb, es); | |
ac27a0ec | 3271 | sbi->s_mount_state = le16_to_cpu(es->s_state); |
617ba13b | 3272 | if ((err = ext4_group_extend(sb, es, n_blocks_count))) |
ac27a0ec | 3273 | goto restore_opts; |
2b2d6d01 | 3274 | if (!ext4_setup_super(sb, es, 0)) |
ac27a0ec DK |
3275 | sb->s_flags &= ~MS_RDONLY; |
3276 | } | |
3277 | } | |
0390131b FM |
3278 | if (sbi->s_journal == NULL) |
3279 | ext4_commit_super(sb, es, 1); | |
3280 | ||
ac27a0ec DK |
3281 | #ifdef CONFIG_QUOTA |
3282 | /* Release old quota file names */ | |
3283 | for (i = 0; i < MAXQUOTAS; i++) | |
3284 | if (old_opts.s_qf_names[i] && | |
3285 | old_opts.s_qf_names[i] != sbi->s_qf_names[i]) | |
3286 | kfree(old_opts.s_qf_names[i]); | |
3287 | #endif | |
3288 | return 0; | |
3289 | restore_opts: | |
3290 | sb->s_flags = old_sb_flags; | |
3291 | sbi->s_mount_opt = old_opts.s_mount_opt; | |
3292 | sbi->s_resuid = old_opts.s_resuid; | |
3293 | sbi->s_resgid = old_opts.s_resgid; | |
3294 | sbi->s_commit_interval = old_opts.s_commit_interval; | |
30773840 TT |
3295 | sbi->s_min_batch_time = old_opts.s_min_batch_time; |
3296 | sbi->s_max_batch_time = old_opts.s_max_batch_time; | |
ac27a0ec DK |
3297 | #ifdef CONFIG_QUOTA |
3298 | sbi->s_jquota_fmt = old_opts.s_jquota_fmt; | |
3299 | for (i = 0; i < MAXQUOTAS; i++) { | |
3300 | if (sbi->s_qf_names[i] && | |
3301 | old_opts.s_qf_names[i] != sbi->s_qf_names[i]) | |
3302 | kfree(sbi->s_qf_names[i]); | |
3303 | sbi->s_qf_names[i] = old_opts.s_qf_names[i]; | |
3304 | } | |
3305 | #endif | |
3306 | return err; | |
3307 | } | |
3308 | ||
2b2d6d01 | 3309 | static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf) |
ac27a0ec DK |
3310 | { |
3311 | struct super_block *sb = dentry->d_sb; | |
617ba13b MC |
3312 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
3313 | struct ext4_super_block *es = sbi->s_es; | |
960cc398 | 3314 | u64 fsid; |
ac27a0ec | 3315 | |
5e70030d BP |
3316 | if (test_opt(sb, MINIX_DF)) { |
3317 | sbi->s_overhead_last = 0; | |
6bc9feff | 3318 | } else if (sbi->s_blocks_last != ext4_blocks_count(es)) { |
fd2d4291 | 3319 | ext4_group_t ngroups = sbi->s_groups_count, i; |
5e70030d | 3320 | ext4_fsblk_t overhead = 0; |
ac27a0ec DK |
3321 | smp_rmb(); |
3322 | ||
3323 | /* | |
5e70030d BP |
3324 | * Compute the overhead (FS structures). This is constant |
3325 | * for a given filesystem unless the number of block groups | |
3326 | * changes so we cache the previous value until it does. | |
ac27a0ec DK |
3327 | */ |
3328 | ||
3329 | /* | |
3330 | * All of the blocks before first_data_block are | |
3331 | * overhead | |
3332 | */ | |
3333 | overhead = le32_to_cpu(es->s_first_data_block); | |
3334 | ||
3335 | /* | |
3336 | * Add the overhead attributed to the superblock and | |
3337 | * block group descriptors. If the sparse superblocks | |
3338 | * feature is turned on, then not all groups have this. | |
3339 | */ | |
3340 | for (i = 0; i < ngroups; i++) { | |
617ba13b MC |
3341 | overhead += ext4_bg_has_super(sb, i) + |
3342 | ext4_bg_num_gdb(sb, i); | |
ac27a0ec DK |
3343 | cond_resched(); |
3344 | } | |
3345 | ||
3346 | /* | |
3347 | * Every block group has an inode bitmap, a block | |
3348 | * bitmap, and an inode table. | |
3349 | */ | |
5e70030d BP |
3350 | overhead += ngroups * (2 + sbi->s_itb_per_group); |
3351 | sbi->s_overhead_last = overhead; | |
3352 | smp_wmb(); | |
6bc9feff | 3353 | sbi->s_blocks_last = ext4_blocks_count(es); |
ac27a0ec DK |
3354 | } |
3355 | ||
617ba13b | 3356 | buf->f_type = EXT4_SUPER_MAGIC; |
ac27a0ec | 3357 | buf->f_bsize = sb->s_blocksize; |
5e70030d | 3358 | buf->f_blocks = ext4_blocks_count(es) - sbi->s_overhead_last; |
6bc6e63f AK |
3359 | buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter) - |
3360 | percpu_counter_sum_positive(&sbi->s_dirtyblocks_counter); | |
308ba3ec | 3361 | ext4_free_blocks_count_set(es, buf->f_bfree); |
bd81d8ee LV |
3362 | buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es); |
3363 | if (buf->f_bfree < ext4_r_blocks_count(es)) | |
ac27a0ec DK |
3364 | buf->f_bavail = 0; |
3365 | buf->f_files = le32_to_cpu(es->s_inodes_count); | |
52d9f3b4 | 3366 | buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter); |
5e70030d | 3367 | es->s_free_inodes_count = cpu_to_le32(buf->f_ffree); |
617ba13b | 3368 | buf->f_namelen = EXT4_NAME_LEN; |
960cc398 PE |
3369 | fsid = le64_to_cpup((void *)es->s_uuid) ^ |
3370 | le64_to_cpup((void *)es->s_uuid + sizeof(u64)); | |
3371 | buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL; | |
3372 | buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL; | |
ac27a0ec DK |
3373 | return 0; |
3374 | } | |
3375 | ||
3376 | /* Helper function for writing quotas on sync - we need to start transaction before quota file | |
3377 | * is locked for write. Otherwise the are possible deadlocks: | |
3378 | * Process 1 Process 2 | |
617ba13b | 3379 | * ext4_create() quota_sync() |
a269eb18 JK |
3380 | * jbd2_journal_start() write_dquot() |
3381 | * vfs_dq_init() down(dqio_mutex) | |
dab291af | 3382 | * down(dqio_mutex) jbd2_journal_start() |
ac27a0ec DK |
3383 | * |
3384 | */ | |
3385 | ||
3386 | #ifdef CONFIG_QUOTA | |
3387 | ||
3388 | static inline struct inode *dquot_to_inode(struct dquot *dquot) | |
3389 | { | |
3390 | return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type]; | |
3391 | } | |
3392 | ||
617ba13b | 3393 | static int ext4_write_dquot(struct dquot *dquot) |
ac27a0ec DK |
3394 | { |
3395 | int ret, err; | |
3396 | handle_t *handle; | |
3397 | struct inode *inode; | |
3398 | ||
3399 | inode = dquot_to_inode(dquot); | |
617ba13b MC |
3400 | handle = ext4_journal_start(inode, |
3401 | EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb)); | |
ac27a0ec DK |
3402 | if (IS_ERR(handle)) |
3403 | return PTR_ERR(handle); | |
3404 | ret = dquot_commit(dquot); | |
617ba13b | 3405 | err = ext4_journal_stop(handle); |
ac27a0ec DK |
3406 | if (!ret) |
3407 | ret = err; | |
3408 | return ret; | |
3409 | } | |
3410 | ||
617ba13b | 3411 | static int ext4_acquire_dquot(struct dquot *dquot) |
ac27a0ec DK |
3412 | { |
3413 | int ret, err; | |
3414 | handle_t *handle; | |
3415 | ||
617ba13b MC |
3416 | handle = ext4_journal_start(dquot_to_inode(dquot), |
3417 | EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb)); | |
ac27a0ec DK |
3418 | if (IS_ERR(handle)) |
3419 | return PTR_ERR(handle); | |
3420 | ret = dquot_acquire(dquot); | |
617ba13b | 3421 | err = ext4_journal_stop(handle); |
ac27a0ec DK |
3422 | if (!ret) |
3423 | ret = err; | |
3424 | return ret; | |
3425 | } | |
3426 | ||
617ba13b | 3427 | static int ext4_release_dquot(struct dquot *dquot) |
ac27a0ec DK |
3428 | { |
3429 | int ret, err; | |
3430 | handle_t *handle; | |
3431 | ||
617ba13b MC |
3432 | handle = ext4_journal_start(dquot_to_inode(dquot), |
3433 | EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb)); | |
9c3013e9 JK |
3434 | if (IS_ERR(handle)) { |
3435 | /* Release dquot anyway to avoid endless cycle in dqput() */ | |
3436 | dquot_release(dquot); | |
ac27a0ec | 3437 | return PTR_ERR(handle); |
9c3013e9 | 3438 | } |
ac27a0ec | 3439 | ret = dquot_release(dquot); |
617ba13b | 3440 | err = ext4_journal_stop(handle); |
ac27a0ec DK |
3441 | if (!ret) |
3442 | ret = err; | |
3443 | return ret; | |
3444 | } | |
3445 | ||
617ba13b | 3446 | static int ext4_mark_dquot_dirty(struct dquot *dquot) |
ac27a0ec | 3447 | { |
2c8be6b2 | 3448 | /* Are we journaling quotas? */ |
617ba13b MC |
3449 | if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] || |
3450 | EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) { | |
ac27a0ec | 3451 | dquot_mark_dquot_dirty(dquot); |
617ba13b | 3452 | return ext4_write_dquot(dquot); |
ac27a0ec DK |
3453 | } else { |
3454 | return dquot_mark_dquot_dirty(dquot); | |
3455 | } | |
3456 | } | |
3457 | ||
617ba13b | 3458 | static int ext4_write_info(struct super_block *sb, int type) |
ac27a0ec DK |
3459 | { |
3460 | int ret, err; | |
3461 | handle_t *handle; | |
3462 | ||
3463 | /* Data block + inode block */ | |
617ba13b | 3464 | handle = ext4_journal_start(sb->s_root->d_inode, 2); |
ac27a0ec DK |
3465 | if (IS_ERR(handle)) |
3466 | return PTR_ERR(handle); | |
3467 | ret = dquot_commit_info(sb, type); | |
617ba13b | 3468 | err = ext4_journal_stop(handle); |
ac27a0ec DK |
3469 | if (!ret) |
3470 | ret = err; | |
3471 | return ret; | |
3472 | } | |
3473 | ||
3474 | /* | |
3475 | * Turn on quotas during mount time - we need to find | |
3476 | * the quota file and such... | |
3477 | */ | |
617ba13b | 3478 | static int ext4_quota_on_mount(struct super_block *sb, int type) |
ac27a0ec | 3479 | { |
617ba13b MC |
3480 | return vfs_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type], |
3481 | EXT4_SB(sb)->s_jquota_fmt, type); | |
ac27a0ec DK |
3482 | } |
3483 | ||
3484 | /* | |
3485 | * Standard function to be called on quota_on | |
3486 | */ | |
617ba13b | 3487 | static int ext4_quota_on(struct super_block *sb, int type, int format_id, |
8264613d | 3488 | char *name, int remount) |
ac27a0ec DK |
3489 | { |
3490 | int err; | |
8264613d | 3491 | struct path path; |
ac27a0ec DK |
3492 | |
3493 | if (!test_opt(sb, QUOTA)) | |
3494 | return -EINVAL; | |
8264613d | 3495 | /* When remounting, no checks are needed and in fact, name is NULL */ |
0623543b | 3496 | if (remount) |
8264613d | 3497 | return vfs_quota_on(sb, type, format_id, name, remount); |
0623543b | 3498 | |
8264613d | 3499 | err = kern_path(name, LOOKUP_FOLLOW, &path); |
ac27a0ec DK |
3500 | if (err) |
3501 | return err; | |
0623543b | 3502 | |
ac27a0ec | 3503 | /* Quotafile not on the same filesystem? */ |
8264613d AV |
3504 | if (path.mnt->mnt_sb != sb) { |
3505 | path_put(&path); | |
ac27a0ec DK |
3506 | return -EXDEV; |
3507 | } | |
0623543b JK |
3508 | /* Journaling quota? */ |
3509 | if (EXT4_SB(sb)->s_qf_names[type]) { | |
2b2d6d01 | 3510 | /* Quotafile not in fs root? */ |
8264613d | 3511 | if (path.dentry->d_parent != sb->s_root) |
0623543b JK |
3512 | printk(KERN_WARNING |
3513 | "EXT4-fs: Quota file not on filesystem root. " | |
3514 | "Journaled quota will not work.\n"); | |
2b2d6d01 | 3515 | } |
0623543b JK |
3516 | |
3517 | /* | |
3518 | * When we journal data on quota file, we have to flush journal to see | |
3519 | * all updates to the file when we bypass pagecache... | |
3520 | */ | |
0390131b FM |
3521 | if (EXT4_SB(sb)->s_journal && |
3522 | ext4_should_journal_data(path.dentry->d_inode)) { | |
0623543b JK |
3523 | /* |
3524 | * We don't need to lock updates but journal_flush() could | |
3525 | * otherwise be livelocked... | |
3526 | */ | |
3527 | jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal); | |
7ffe1ea8 | 3528 | err = jbd2_journal_flush(EXT4_SB(sb)->s_journal); |
0623543b | 3529 | jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); |
7ffe1ea8 | 3530 | if (err) { |
8264613d | 3531 | path_put(&path); |
7ffe1ea8 HK |
3532 | return err; |
3533 | } | |
0623543b JK |
3534 | } |
3535 | ||
8264613d AV |
3536 | err = vfs_quota_on_path(sb, type, format_id, &path); |
3537 | path_put(&path); | |
77e69dac | 3538 | return err; |
ac27a0ec DK |
3539 | } |
3540 | ||
3541 | /* Read data from quotafile - avoid pagecache and such because we cannot afford | |
3542 | * acquiring the locks... As quota files are never truncated and quota code | |
3543 | * itself serializes the operations (and noone else should touch the files) | |
3544 | * we don't have to be afraid of races */ | |
617ba13b | 3545 | static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data, |
ac27a0ec DK |
3546 | size_t len, loff_t off) |
3547 | { | |
3548 | struct inode *inode = sb_dqopt(sb)->files[type]; | |
725d26d3 | 3549 | ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb); |
ac27a0ec DK |
3550 | int err = 0; |
3551 | int offset = off & (sb->s_blocksize - 1); | |
3552 | int tocopy; | |
3553 | size_t toread; | |
3554 | struct buffer_head *bh; | |
3555 | loff_t i_size = i_size_read(inode); | |
3556 | ||
3557 | if (off > i_size) | |
3558 | return 0; | |
3559 | if (off+len > i_size) | |
3560 | len = i_size-off; | |
3561 | toread = len; | |
3562 | while (toread > 0) { | |
3563 | tocopy = sb->s_blocksize - offset < toread ? | |
3564 | sb->s_blocksize - offset : toread; | |
617ba13b | 3565 | bh = ext4_bread(NULL, inode, blk, 0, &err); |
ac27a0ec DK |
3566 | if (err) |
3567 | return err; | |
3568 | if (!bh) /* A hole? */ | |
3569 | memset(data, 0, tocopy); | |
3570 | else | |
3571 | memcpy(data, bh->b_data+offset, tocopy); | |
3572 | brelse(bh); | |
3573 | offset = 0; | |
3574 | toread -= tocopy; | |
3575 | data += tocopy; | |
3576 | blk++; | |
3577 | } | |
3578 | return len; | |
3579 | } | |
3580 | ||
3581 | /* Write to quotafile (we know the transaction is already started and has | |
3582 | * enough credits) */ | |
617ba13b | 3583 | static ssize_t ext4_quota_write(struct super_block *sb, int type, |
ac27a0ec DK |
3584 | const char *data, size_t len, loff_t off) |
3585 | { | |
3586 | struct inode *inode = sb_dqopt(sb)->files[type]; | |
725d26d3 | 3587 | ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb); |
ac27a0ec DK |
3588 | int err = 0; |
3589 | int offset = off & (sb->s_blocksize - 1); | |
3590 | int tocopy; | |
617ba13b | 3591 | int journal_quota = EXT4_SB(sb)->s_qf_names[type] != NULL; |
ac27a0ec DK |
3592 | size_t towrite = len; |
3593 | struct buffer_head *bh; | |
3594 | handle_t *handle = journal_current_handle(); | |
3595 | ||
0390131b | 3596 | if (EXT4_SB(sb)->s_journal && !handle) { |
e5f8eab8 | 3597 | printk(KERN_WARNING "EXT4-fs: Quota write (off=%llu, len=%llu)" |
9c3013e9 JK |
3598 | " cancelled because transaction is not started.\n", |
3599 | (unsigned long long)off, (unsigned long long)len); | |
3600 | return -EIO; | |
3601 | } | |
ac27a0ec DK |
3602 | mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA); |
3603 | while (towrite > 0) { | |
3604 | tocopy = sb->s_blocksize - offset < towrite ? | |
3605 | sb->s_blocksize - offset : towrite; | |
617ba13b | 3606 | bh = ext4_bread(handle, inode, blk, 1, &err); |
ac27a0ec DK |
3607 | if (!bh) |
3608 | goto out; | |
3609 | if (journal_quota) { | |
617ba13b | 3610 | err = ext4_journal_get_write_access(handle, bh); |
ac27a0ec DK |
3611 | if (err) { |
3612 | brelse(bh); | |
3613 | goto out; | |
3614 | } | |
3615 | } | |
3616 | lock_buffer(bh); | |
3617 | memcpy(bh->b_data+offset, data, tocopy); | |
3618 | flush_dcache_page(bh->b_page); | |
3619 | unlock_buffer(bh); | |
3620 | if (journal_quota) | |
0390131b | 3621 | err = ext4_handle_dirty_metadata(handle, NULL, bh); |
ac27a0ec DK |
3622 | else { |
3623 | /* Always do at least ordered writes for quotas */ | |
678aaf48 | 3624 | err = ext4_jbd2_file_inode(handle, inode); |
ac27a0ec DK |
3625 | mark_buffer_dirty(bh); |
3626 | } | |
3627 | brelse(bh); | |
3628 | if (err) | |
3629 | goto out; | |
3630 | offset = 0; | |
3631 | towrite -= tocopy; | |
3632 | data += tocopy; | |
3633 | blk++; | |
3634 | } | |
3635 | out: | |
4d04e4fb JK |
3636 | if (len == towrite) { |
3637 | mutex_unlock(&inode->i_mutex); | |
ac27a0ec | 3638 | return err; |
4d04e4fb | 3639 | } |
ac27a0ec DK |
3640 | if (inode->i_size < off+len-towrite) { |
3641 | i_size_write(inode, off+len-towrite); | |
617ba13b | 3642 | EXT4_I(inode)->i_disksize = inode->i_size; |
ac27a0ec | 3643 | } |
ac27a0ec | 3644 | inode->i_mtime = inode->i_ctime = CURRENT_TIME; |
617ba13b | 3645 | ext4_mark_inode_dirty(handle, inode); |
ac27a0ec DK |
3646 | mutex_unlock(&inode->i_mutex); |
3647 | return len - towrite; | |
3648 | } | |
3649 | ||
3650 | #endif | |
3651 | ||
617ba13b | 3652 | static int ext4_get_sb(struct file_system_type *fs_type, |
ac27a0ec DK |
3653 | int flags, const char *dev_name, void *data, struct vfsmount *mnt) |
3654 | { | |
617ba13b | 3655 | return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super, mnt); |
ac27a0ec DK |
3656 | } |
3657 | ||
5e8814f2 TT |
3658 | #ifdef CONFIG_PROC_FS |
3659 | static int ext4_ui_proc_show(struct seq_file *m, void *v) | |
3660 | { | |
3661 | unsigned int *p = m->private; | |
3662 | ||
3663 | seq_printf(m, "%u\n", *p); | |
3664 | return 0; | |
3665 | } | |
3666 | ||
3667 | static int ext4_ui_proc_open(struct inode *inode, struct file *file) | |
3668 | { | |
3669 | return single_open(file, ext4_ui_proc_show, PDE(inode)->data); | |
3670 | } | |
3671 | ||
3672 | static ssize_t ext4_ui_proc_write(struct file *file, const char __user *buf, | |
3673 | size_t cnt, loff_t *ppos) | |
3674 | { | |
23475e26 | 3675 | unsigned long *p = PDE(file->f_path.dentry->d_inode)->data; |
5e8814f2 | 3676 | char str[32]; |
5e8814f2 TT |
3677 | |
3678 | if (cnt >= sizeof(str)) | |
3679 | return -EINVAL; | |
3680 | if (copy_from_user(str, buf, cnt)) | |
3681 | return -EFAULT; | |
23475e26 RK |
3682 | |
3683 | *p = simple_strtoul(str, NULL, 0); | |
5e8814f2 TT |
3684 | return cnt; |
3685 | } | |
3686 | ||
3687 | const struct file_operations ext4_ui_proc_fops = { | |
3688 | .owner = THIS_MODULE, | |
3689 | .open = ext4_ui_proc_open, | |
3690 | .read = seq_read, | |
3691 | .llseek = seq_lseek, | |
3692 | .release = single_release, | |
3693 | .write = ext4_ui_proc_write, | |
3694 | }; | |
3695 | #endif | |
3696 | ||
03010a33 TT |
3697 | static struct file_system_type ext4_fs_type = { |
3698 | .owner = THIS_MODULE, | |
3699 | .name = "ext4", | |
3700 | .get_sb = ext4_get_sb, | |
3701 | .kill_sb = kill_block_super, | |
3702 | .fs_flags = FS_REQUIRES_DEV, | |
3703 | }; | |
3704 | ||
3705 | #ifdef CONFIG_EXT4DEV_COMPAT | |
3706 | static int ext4dev_get_sb(struct file_system_type *fs_type, | |
3707 | int flags, const char *dev_name, void *data, struct vfsmount *mnt) | |
3708 | { | |
3709 | printk(KERN_WARNING "EXT4-fs: Update your userspace programs " | |
3710 | "to mount using ext4\n"); | |
3711 | printk(KERN_WARNING "EXT4-fs: ext4dev backwards compatibility " | |
3712 | "will go away by 2.6.31\n"); | |
3713 | return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super, mnt); | |
3714 | } | |
3715 | ||
617ba13b | 3716 | static struct file_system_type ext4dev_fs_type = { |
ac27a0ec | 3717 | .owner = THIS_MODULE, |
617ba13b | 3718 | .name = "ext4dev", |
03010a33 | 3719 | .get_sb = ext4dev_get_sb, |
ac27a0ec DK |
3720 | .kill_sb = kill_block_super, |
3721 | .fs_flags = FS_REQUIRES_DEV, | |
3722 | }; | |
03010a33 TT |
3723 | MODULE_ALIAS("ext4dev"); |
3724 | #endif | |
ac27a0ec | 3725 | |
617ba13b | 3726 | static int __init init_ext4_fs(void) |
ac27a0ec | 3727 | { |
c9de560d AT |
3728 | int err; |
3729 | ||
9f6200bb | 3730 | ext4_proc_root = proc_mkdir("fs/ext4", NULL); |
c9de560d | 3731 | err = init_ext4_mballoc(); |
ac27a0ec DK |
3732 | if (err) |
3733 | return err; | |
c9de560d AT |
3734 | |
3735 | err = init_ext4_xattr(); | |
3736 | if (err) | |
3737 | goto out2; | |
ac27a0ec DK |
3738 | err = init_inodecache(); |
3739 | if (err) | |
3740 | goto out1; | |
03010a33 | 3741 | err = register_filesystem(&ext4_fs_type); |
ac27a0ec DK |
3742 | if (err) |
3743 | goto out; | |
03010a33 TT |
3744 | #ifdef CONFIG_EXT4DEV_COMPAT |
3745 | err = register_filesystem(&ext4dev_fs_type); | |
3746 | if (err) { | |
3747 | unregister_filesystem(&ext4_fs_type); | |
3748 | goto out; | |
3749 | } | |
3750 | #endif | |
ac27a0ec DK |
3751 | return 0; |
3752 | out: | |
3753 | destroy_inodecache(); | |
3754 | out1: | |
617ba13b | 3755 | exit_ext4_xattr(); |
c9de560d AT |
3756 | out2: |
3757 | exit_ext4_mballoc(); | |
ac27a0ec DK |
3758 | return err; |
3759 | } | |
3760 | ||
617ba13b | 3761 | static void __exit exit_ext4_fs(void) |
ac27a0ec | 3762 | { |
03010a33 TT |
3763 | unregister_filesystem(&ext4_fs_type); |
3764 | #ifdef CONFIG_EXT4DEV_COMPAT | |
617ba13b | 3765 | unregister_filesystem(&ext4dev_fs_type); |
03010a33 | 3766 | #endif |
ac27a0ec | 3767 | destroy_inodecache(); |
617ba13b | 3768 | exit_ext4_xattr(); |
c9de560d | 3769 | exit_ext4_mballoc(); |
9f6200bb | 3770 | remove_proc_entry("fs/ext4", NULL); |
ac27a0ec DK |
3771 | } |
3772 | ||
3773 | MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others"); | |
83982b6f | 3774 | MODULE_DESCRIPTION("Fourth Extended Filesystem"); |
ac27a0ec | 3775 | MODULE_LICENSE("GPL"); |
617ba13b MC |
3776 | module_init(init_ext4_fs) |
3777 | module_exit(exit_ext4_fs) |