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Commit | Line | Data |
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ac27a0ec | 1 | /* |
617ba13b | 2 | * linux/fs/ext4/super.c |
ac27a0ec DK |
3 | * |
4 | * Copyright (C) 1992, 1993, 1994, 1995 | |
5 | * Remy Card (card@masi.ibp.fr) | |
6 | * Laboratoire MASI - Institut Blaise Pascal | |
7 | * Universite Pierre et Marie Curie (Paris VI) | |
8 | * | |
9 | * from | |
10 | * | |
11 | * linux/fs/minix/inode.c | |
12 | * | |
13 | * Copyright (C) 1991, 1992 Linus Torvalds | |
14 | * | |
15 | * Big-endian to little-endian byte-swapping/bitmaps by | |
16 | * David S. Miller (davem@caip.rutgers.edu), 1995 | |
17 | */ | |
18 | ||
19 | #include <linux/module.h> | |
20 | #include <linux/string.h> | |
21 | #include <linux/fs.h> | |
22 | #include <linux/time.h> | |
dab291af | 23 | #include <linux/jbd2.h> |
617ba13b | 24 | #include <linux/ext4_fs.h> |
dab291af | 25 | #include <linux/ext4_jbd2.h> |
ac27a0ec DK |
26 | #include <linux/slab.h> |
27 | #include <linux/init.h> | |
28 | #include <linux/blkdev.h> | |
29 | #include <linux/parser.h> | |
30 | #include <linux/smp_lock.h> | |
31 | #include <linux/buffer_head.h> | |
a5694255 | 32 | #include <linux/exportfs.h> |
ac27a0ec DK |
33 | #include <linux/vfs.h> |
34 | #include <linux/random.h> | |
35 | #include <linux/mount.h> | |
36 | #include <linux/namei.h> | |
37 | #include <linux/quotaops.h> | |
38 | #include <linux/seq_file.h> | |
1330593e | 39 | #include <linux/log2.h> |
717d50e4 | 40 | #include <linux/crc16.h> |
ac27a0ec DK |
41 | |
42 | #include <asm/uaccess.h> | |
43 | ||
44 | #include "xattr.h" | |
45 | #include "acl.h" | |
46 | #include "namei.h" | |
717d50e4 | 47 | #include "group.h" |
ac27a0ec | 48 | |
617ba13b | 49 | static int ext4_load_journal(struct super_block *, struct ext4_super_block *, |
ac27a0ec | 50 | unsigned long journal_devnum); |
617ba13b | 51 | static int ext4_create_journal(struct super_block *, struct ext4_super_block *, |
ac27a0ec | 52 | unsigned int); |
617ba13b MC |
53 | static void ext4_commit_super (struct super_block * sb, |
54 | struct ext4_super_block * es, | |
ac27a0ec | 55 | int sync); |
617ba13b MC |
56 | static void ext4_mark_recovery_complete(struct super_block * sb, |
57 | struct ext4_super_block * es); | |
58 | static void ext4_clear_journal_err(struct super_block * sb, | |
59 | struct ext4_super_block * es); | |
60 | static int ext4_sync_fs(struct super_block *sb, int wait); | |
61 | static const char *ext4_decode_error(struct super_block * sb, int errno, | |
ac27a0ec | 62 | char nbuf[16]); |
617ba13b MC |
63 | static int ext4_remount (struct super_block * sb, int * flags, char * data); |
64 | static int ext4_statfs (struct dentry * dentry, struct kstatfs * buf); | |
65 | static void ext4_unlockfs(struct super_block *sb); | |
66 | static void ext4_write_super (struct super_block * sb); | |
67 | static void ext4_write_super_lockfs(struct super_block *sb); | |
ac27a0ec | 68 | |
bd81d8ee | 69 | |
8fadc143 AR |
70 | ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, |
71 | struct ext4_group_desc *bg) | |
bd81d8ee | 72 | { |
3a14589c | 73 | return le32_to_cpu(bg->bg_block_bitmap_lo) | |
8fadc143 | 74 | (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? |
3a14589c | 75 | (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0); |
bd81d8ee LV |
76 | } |
77 | ||
8fadc143 AR |
78 | ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, |
79 | struct ext4_group_desc *bg) | |
bd81d8ee | 80 | { |
5272f837 | 81 | return le32_to_cpu(bg->bg_inode_bitmap_lo) | |
8fadc143 | 82 | (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? |
5272f837 | 83 | (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0); |
bd81d8ee LV |
84 | } |
85 | ||
8fadc143 AR |
86 | ext4_fsblk_t ext4_inode_table(struct super_block *sb, |
87 | struct ext4_group_desc *bg) | |
bd81d8ee | 88 | { |
5272f837 | 89 | return le32_to_cpu(bg->bg_inode_table_lo) | |
8fadc143 | 90 | (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? |
5272f837 | 91 | (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0); |
bd81d8ee LV |
92 | } |
93 | ||
8fadc143 AR |
94 | void ext4_block_bitmap_set(struct super_block *sb, |
95 | struct ext4_group_desc *bg, ext4_fsblk_t blk) | |
bd81d8ee | 96 | { |
3a14589c | 97 | bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk); |
8fadc143 AR |
98 | if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) |
99 | bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32); | |
bd81d8ee LV |
100 | } |
101 | ||
8fadc143 AR |
102 | void ext4_inode_bitmap_set(struct super_block *sb, |
103 | struct ext4_group_desc *bg, ext4_fsblk_t blk) | |
bd81d8ee | 104 | { |
5272f837 | 105 | bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk); |
8fadc143 AR |
106 | if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) |
107 | bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32); | |
bd81d8ee LV |
108 | } |
109 | ||
8fadc143 AR |
110 | void ext4_inode_table_set(struct super_block *sb, |
111 | struct ext4_group_desc *bg, ext4_fsblk_t blk) | |
bd81d8ee | 112 | { |
5272f837 | 113 | bg->bg_inode_table_lo = cpu_to_le32((u32)blk); |
8fadc143 AR |
114 | if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) |
115 | bg->bg_inode_table_hi = cpu_to_le32(blk >> 32); | |
bd81d8ee LV |
116 | } |
117 | ||
ac27a0ec | 118 | /* |
dab291af | 119 | * Wrappers for jbd2_journal_start/end. |
ac27a0ec DK |
120 | * |
121 | * The only special thing we need to do here is to make sure that all | |
122 | * journal_end calls result in the superblock being marked dirty, so | |
123 | * that sync() will call the filesystem's write_super callback if | |
124 | * appropriate. | |
125 | */ | |
617ba13b | 126 | handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks) |
ac27a0ec DK |
127 | { |
128 | journal_t *journal; | |
129 | ||
130 | if (sb->s_flags & MS_RDONLY) | |
131 | return ERR_PTR(-EROFS); | |
132 | ||
133 | /* Special case here: if the journal has aborted behind our | |
134 | * backs (eg. EIO in the commit thread), then we still need to | |
135 | * take the FS itself readonly cleanly. */ | |
617ba13b | 136 | journal = EXT4_SB(sb)->s_journal; |
ac27a0ec | 137 | if (is_journal_aborted(journal)) { |
617ba13b | 138 | ext4_abort(sb, __FUNCTION__, |
ac27a0ec DK |
139 | "Detected aborted journal"); |
140 | return ERR_PTR(-EROFS); | |
141 | } | |
142 | ||
dab291af | 143 | return jbd2_journal_start(journal, nblocks); |
ac27a0ec DK |
144 | } |
145 | ||
146 | /* | |
147 | * The only special thing we need to do here is to make sure that all | |
dab291af | 148 | * jbd2_journal_stop calls result in the superblock being marked dirty, so |
ac27a0ec DK |
149 | * that sync() will call the filesystem's write_super callback if |
150 | * appropriate. | |
151 | */ | |
617ba13b | 152 | int __ext4_journal_stop(const char *where, handle_t *handle) |
ac27a0ec DK |
153 | { |
154 | struct super_block *sb; | |
155 | int err; | |
156 | int rc; | |
157 | ||
158 | sb = handle->h_transaction->t_journal->j_private; | |
159 | err = handle->h_err; | |
dab291af | 160 | rc = jbd2_journal_stop(handle); |
ac27a0ec DK |
161 | |
162 | if (!err) | |
163 | err = rc; | |
164 | if (err) | |
617ba13b | 165 | __ext4_std_error(sb, where, err); |
ac27a0ec DK |
166 | return err; |
167 | } | |
168 | ||
617ba13b | 169 | void ext4_journal_abort_handle(const char *caller, const char *err_fn, |
ac27a0ec DK |
170 | struct buffer_head *bh, handle_t *handle, int err) |
171 | { | |
172 | char nbuf[16]; | |
617ba13b | 173 | const char *errstr = ext4_decode_error(NULL, err, nbuf); |
ac27a0ec DK |
174 | |
175 | if (bh) | |
176 | BUFFER_TRACE(bh, "abort"); | |
177 | ||
178 | if (!handle->h_err) | |
179 | handle->h_err = err; | |
180 | ||
181 | if (is_handle_aborted(handle)) | |
182 | return; | |
183 | ||
184 | printk(KERN_ERR "%s: aborting transaction: %s in %s\n", | |
185 | caller, errstr, err_fn); | |
186 | ||
dab291af | 187 | jbd2_journal_abort_handle(handle); |
ac27a0ec DK |
188 | } |
189 | ||
190 | /* Deal with the reporting of failure conditions on a filesystem such as | |
191 | * inconsistencies detected or read IO failures. | |
192 | * | |
193 | * On ext2, we can store the error state of the filesystem in the | |
617ba13b | 194 | * superblock. That is not possible on ext4, because we may have other |
ac27a0ec DK |
195 | * write ordering constraints on the superblock which prevent us from |
196 | * writing it out straight away; and given that the journal is about to | |
197 | * be aborted, we can't rely on the current, or future, transactions to | |
198 | * write out the superblock safely. | |
199 | * | |
dab291af | 200 | * We'll just use the jbd2_journal_abort() error code to record an error in |
ac27a0ec DK |
201 | * the journal instead. On recovery, the journal will compain about |
202 | * that error until we've noted it down and cleared it. | |
203 | */ | |
204 | ||
617ba13b | 205 | static void ext4_handle_error(struct super_block *sb) |
ac27a0ec | 206 | { |
617ba13b | 207 | struct ext4_super_block *es = EXT4_SB(sb)->s_es; |
ac27a0ec | 208 | |
617ba13b MC |
209 | EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; |
210 | es->s_state |= cpu_to_le16(EXT4_ERROR_FS); | |
ac27a0ec DK |
211 | |
212 | if (sb->s_flags & MS_RDONLY) | |
213 | return; | |
214 | ||
215 | if (!test_opt (sb, ERRORS_CONT)) { | |
617ba13b | 216 | journal_t *journal = EXT4_SB(sb)->s_journal; |
ac27a0ec | 217 | |
617ba13b | 218 | EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT; |
ac27a0ec | 219 | if (journal) |
dab291af | 220 | jbd2_journal_abort(journal, -EIO); |
ac27a0ec DK |
221 | } |
222 | if (test_opt (sb, ERRORS_RO)) { | |
223 | printk (KERN_CRIT "Remounting filesystem read-only\n"); | |
224 | sb->s_flags |= MS_RDONLY; | |
225 | } | |
617ba13b | 226 | ext4_commit_super(sb, es, 1); |
ac27a0ec | 227 | if (test_opt(sb, ERRORS_PANIC)) |
617ba13b | 228 | panic("EXT4-fs (device %s): panic forced after error\n", |
ac27a0ec DK |
229 | sb->s_id); |
230 | } | |
231 | ||
617ba13b | 232 | void ext4_error (struct super_block * sb, const char * function, |
ac27a0ec DK |
233 | const char * fmt, ...) |
234 | { | |
235 | va_list args; | |
236 | ||
237 | va_start(args, fmt); | |
617ba13b | 238 | printk(KERN_CRIT "EXT4-fs error (device %s): %s: ",sb->s_id, function); |
ac27a0ec DK |
239 | vprintk(fmt, args); |
240 | printk("\n"); | |
241 | va_end(args); | |
242 | ||
617ba13b | 243 | ext4_handle_error(sb); |
ac27a0ec DK |
244 | } |
245 | ||
617ba13b | 246 | static const char *ext4_decode_error(struct super_block * sb, int errno, |
ac27a0ec DK |
247 | char nbuf[16]) |
248 | { | |
249 | char *errstr = NULL; | |
250 | ||
251 | switch (errno) { | |
252 | case -EIO: | |
253 | errstr = "IO failure"; | |
254 | break; | |
255 | case -ENOMEM: | |
256 | errstr = "Out of memory"; | |
257 | break; | |
258 | case -EROFS: | |
dab291af | 259 | if (!sb || EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT) |
ac27a0ec DK |
260 | errstr = "Journal has aborted"; |
261 | else | |
262 | errstr = "Readonly filesystem"; | |
263 | break; | |
264 | default: | |
265 | /* If the caller passed in an extra buffer for unknown | |
266 | * errors, textualise them now. Else we just return | |
267 | * NULL. */ | |
268 | if (nbuf) { | |
269 | /* Check for truncated error codes... */ | |
270 | if (snprintf(nbuf, 16, "error %d", -errno) >= 0) | |
271 | errstr = nbuf; | |
272 | } | |
273 | break; | |
274 | } | |
275 | ||
276 | return errstr; | |
277 | } | |
278 | ||
617ba13b | 279 | /* __ext4_std_error decodes expected errors from journaling functions |
ac27a0ec DK |
280 | * automatically and invokes the appropriate error response. */ |
281 | ||
617ba13b | 282 | void __ext4_std_error (struct super_block * sb, const char * function, |
ac27a0ec DK |
283 | int errno) |
284 | { | |
285 | char nbuf[16]; | |
286 | const char *errstr; | |
287 | ||
288 | /* Special case: if the error is EROFS, and we're not already | |
289 | * inside a transaction, then there's really no point in logging | |
290 | * an error. */ | |
291 | if (errno == -EROFS && journal_current_handle() == NULL && | |
292 | (sb->s_flags & MS_RDONLY)) | |
293 | return; | |
294 | ||
617ba13b MC |
295 | errstr = ext4_decode_error(sb, errno, nbuf); |
296 | printk (KERN_CRIT "EXT4-fs error (device %s) in %s: %s\n", | |
ac27a0ec DK |
297 | sb->s_id, function, errstr); |
298 | ||
617ba13b | 299 | ext4_handle_error(sb); |
ac27a0ec DK |
300 | } |
301 | ||
302 | /* | |
617ba13b | 303 | * ext4_abort is a much stronger failure handler than ext4_error. The |
ac27a0ec DK |
304 | * abort function may be used to deal with unrecoverable failures such |
305 | * as journal IO errors or ENOMEM at a critical moment in log management. | |
306 | * | |
307 | * We unconditionally force the filesystem into an ABORT|READONLY state, | |
308 | * unless the error response on the fs has been set to panic in which | |
309 | * case we take the easy way out and panic immediately. | |
310 | */ | |
311 | ||
617ba13b | 312 | void ext4_abort (struct super_block * sb, const char * function, |
ac27a0ec DK |
313 | const char * fmt, ...) |
314 | { | |
315 | va_list args; | |
316 | ||
617ba13b | 317 | printk (KERN_CRIT "ext4_abort called.\n"); |
ac27a0ec DK |
318 | |
319 | va_start(args, fmt); | |
617ba13b | 320 | printk(KERN_CRIT "EXT4-fs error (device %s): %s: ",sb->s_id, function); |
ac27a0ec DK |
321 | vprintk(fmt, args); |
322 | printk("\n"); | |
323 | va_end(args); | |
324 | ||
325 | if (test_opt(sb, ERRORS_PANIC)) | |
617ba13b | 326 | panic("EXT4-fs panic from previous error\n"); |
ac27a0ec DK |
327 | |
328 | if (sb->s_flags & MS_RDONLY) | |
329 | return; | |
330 | ||
331 | printk(KERN_CRIT "Remounting filesystem read-only\n"); | |
617ba13b | 332 | EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; |
ac27a0ec | 333 | sb->s_flags |= MS_RDONLY; |
617ba13b | 334 | EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT; |
dab291af | 335 | jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO); |
ac27a0ec DK |
336 | } |
337 | ||
617ba13b | 338 | void ext4_warning (struct super_block * sb, const char * function, |
ac27a0ec DK |
339 | const char * fmt, ...) |
340 | { | |
341 | va_list args; | |
342 | ||
343 | va_start(args, fmt); | |
617ba13b | 344 | printk(KERN_WARNING "EXT4-fs warning (device %s): %s: ", |
ac27a0ec DK |
345 | sb->s_id, function); |
346 | vprintk(fmt, args); | |
347 | printk("\n"); | |
348 | va_end(args); | |
349 | } | |
350 | ||
617ba13b | 351 | void ext4_update_dynamic_rev(struct super_block *sb) |
ac27a0ec | 352 | { |
617ba13b | 353 | struct ext4_super_block *es = EXT4_SB(sb)->s_es; |
ac27a0ec | 354 | |
617ba13b | 355 | if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV) |
ac27a0ec DK |
356 | return; |
357 | ||
617ba13b | 358 | ext4_warning(sb, __FUNCTION__, |
ac27a0ec DK |
359 | "updating to rev %d because of new feature flag, " |
360 | "running e2fsck is recommended", | |
617ba13b | 361 | EXT4_DYNAMIC_REV); |
ac27a0ec | 362 | |
617ba13b MC |
363 | es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO); |
364 | es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE); | |
365 | es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV); | |
ac27a0ec DK |
366 | /* leave es->s_feature_*compat flags alone */ |
367 | /* es->s_uuid will be set by e2fsck if empty */ | |
368 | ||
369 | /* | |
370 | * The rest of the superblock fields should be zero, and if not it | |
371 | * means they are likely already in use, so leave them alone. We | |
372 | * can leave it up to e2fsck to clean up any inconsistencies there. | |
373 | */ | |
374 | } | |
375 | ||
99e6f829 AK |
376 | int ext4_update_compat_feature(handle_t *handle, |
377 | struct super_block *sb, __u32 compat) | |
378 | { | |
379 | int err = 0; | |
380 | if (!EXT4_HAS_COMPAT_FEATURE(sb, compat)) { | |
381 | err = ext4_journal_get_write_access(handle, | |
382 | EXT4_SB(sb)->s_sbh); | |
383 | if (err) | |
384 | return err; | |
385 | EXT4_SET_COMPAT_FEATURE(sb, compat); | |
386 | sb->s_dirt = 1; | |
387 | handle->h_sync = 1; | |
388 | BUFFER_TRACE(EXT4_SB(sb)->s_sbh, | |
389 | "call ext4_journal_dirty_met adata"); | |
390 | err = ext4_journal_dirty_metadata(handle, | |
391 | EXT4_SB(sb)->s_sbh); | |
392 | } | |
393 | return err; | |
394 | } | |
395 | ||
396 | int ext4_update_rocompat_feature(handle_t *handle, | |
397 | struct super_block *sb, __u32 rocompat) | |
398 | { | |
399 | int err = 0; | |
400 | if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, rocompat)) { | |
401 | err = ext4_journal_get_write_access(handle, | |
402 | EXT4_SB(sb)->s_sbh); | |
403 | if (err) | |
404 | return err; | |
405 | EXT4_SET_RO_COMPAT_FEATURE(sb, rocompat); | |
406 | sb->s_dirt = 1; | |
407 | handle->h_sync = 1; | |
408 | BUFFER_TRACE(EXT4_SB(sb)->s_sbh, | |
409 | "call ext4_journal_dirty_met adata"); | |
410 | err = ext4_journal_dirty_metadata(handle, | |
411 | EXT4_SB(sb)->s_sbh); | |
412 | } | |
413 | return err; | |
414 | } | |
415 | ||
416 | int ext4_update_incompat_feature(handle_t *handle, | |
417 | struct super_block *sb, __u32 incompat) | |
418 | { | |
419 | int err = 0; | |
420 | if (!EXT4_HAS_INCOMPAT_FEATURE(sb, incompat)) { | |
421 | err = ext4_journal_get_write_access(handle, | |
422 | EXT4_SB(sb)->s_sbh); | |
423 | if (err) | |
424 | return err; | |
425 | EXT4_SET_INCOMPAT_FEATURE(sb, incompat); | |
426 | sb->s_dirt = 1; | |
427 | handle->h_sync = 1; | |
428 | BUFFER_TRACE(EXT4_SB(sb)->s_sbh, | |
429 | "call ext4_journal_dirty_met adata"); | |
430 | err = ext4_journal_dirty_metadata(handle, | |
431 | EXT4_SB(sb)->s_sbh); | |
432 | } | |
433 | return err; | |
434 | } | |
435 | ||
ac27a0ec DK |
436 | /* |
437 | * Open the external journal device | |
438 | */ | |
617ba13b | 439 | static struct block_device *ext4_blkdev_get(dev_t dev) |
ac27a0ec DK |
440 | { |
441 | struct block_device *bdev; | |
442 | char b[BDEVNAME_SIZE]; | |
443 | ||
444 | bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE); | |
445 | if (IS_ERR(bdev)) | |
446 | goto fail; | |
447 | return bdev; | |
448 | ||
449 | fail: | |
617ba13b | 450 | printk(KERN_ERR "EXT4: failed to open journal device %s: %ld\n", |
ac27a0ec DK |
451 | __bdevname(dev, b), PTR_ERR(bdev)); |
452 | return NULL; | |
453 | } | |
454 | ||
455 | /* | |
456 | * Release the journal device | |
457 | */ | |
617ba13b | 458 | static int ext4_blkdev_put(struct block_device *bdev) |
ac27a0ec DK |
459 | { |
460 | bd_release(bdev); | |
461 | return blkdev_put(bdev); | |
462 | } | |
463 | ||
617ba13b | 464 | static int ext4_blkdev_remove(struct ext4_sb_info *sbi) |
ac27a0ec DK |
465 | { |
466 | struct block_device *bdev; | |
467 | int ret = -ENODEV; | |
468 | ||
469 | bdev = sbi->journal_bdev; | |
470 | if (bdev) { | |
617ba13b | 471 | ret = ext4_blkdev_put(bdev); |
ac27a0ec DK |
472 | sbi->journal_bdev = NULL; |
473 | } | |
474 | return ret; | |
475 | } | |
476 | ||
477 | static inline struct inode *orphan_list_entry(struct list_head *l) | |
478 | { | |
617ba13b | 479 | return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode; |
ac27a0ec DK |
480 | } |
481 | ||
617ba13b | 482 | static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi) |
ac27a0ec DK |
483 | { |
484 | struct list_head *l; | |
485 | ||
486 | printk(KERN_ERR "sb orphan head is %d\n", | |
487 | le32_to_cpu(sbi->s_es->s_last_orphan)); | |
488 | ||
489 | printk(KERN_ERR "sb_info orphan list:\n"); | |
490 | list_for_each(l, &sbi->s_orphan) { | |
491 | struct inode *inode = orphan_list_entry(l); | |
492 | printk(KERN_ERR " " | |
493 | "inode %s:%lu at %p: mode %o, nlink %d, next %d\n", | |
494 | inode->i_sb->s_id, inode->i_ino, inode, | |
495 | inode->i_mode, inode->i_nlink, | |
496 | NEXT_ORPHAN(inode)); | |
497 | } | |
498 | } | |
499 | ||
617ba13b | 500 | static void ext4_put_super (struct super_block * sb) |
ac27a0ec | 501 | { |
617ba13b MC |
502 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
503 | struct ext4_super_block *es = sbi->s_es; | |
ac27a0ec DK |
504 | int i; |
505 | ||
a86c6181 | 506 | ext4_ext_release(sb); |
617ba13b | 507 | ext4_xattr_put_super(sb); |
dab291af | 508 | jbd2_journal_destroy(sbi->s_journal); |
ac27a0ec | 509 | if (!(sb->s_flags & MS_RDONLY)) { |
617ba13b | 510 | EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); |
ac27a0ec DK |
511 | es->s_state = cpu_to_le16(sbi->s_mount_state); |
512 | BUFFER_TRACE(sbi->s_sbh, "marking dirty"); | |
513 | mark_buffer_dirty(sbi->s_sbh); | |
617ba13b | 514 | ext4_commit_super(sb, es, 1); |
ac27a0ec DK |
515 | } |
516 | ||
517 | for (i = 0; i < sbi->s_gdb_count; i++) | |
518 | brelse(sbi->s_group_desc[i]); | |
519 | kfree(sbi->s_group_desc); | |
520 | percpu_counter_destroy(&sbi->s_freeblocks_counter); | |
521 | percpu_counter_destroy(&sbi->s_freeinodes_counter); | |
522 | percpu_counter_destroy(&sbi->s_dirs_counter); | |
523 | brelse(sbi->s_sbh); | |
524 | #ifdef CONFIG_QUOTA | |
525 | for (i = 0; i < MAXQUOTAS; i++) | |
526 | kfree(sbi->s_qf_names[i]); | |
527 | #endif | |
528 | ||
529 | /* Debugging code just in case the in-memory inode orphan list | |
530 | * isn't empty. The on-disk one can be non-empty if we've | |
531 | * detected an error and taken the fs readonly, but the | |
532 | * in-memory list had better be clean by this point. */ | |
533 | if (!list_empty(&sbi->s_orphan)) | |
534 | dump_orphan_list(sb, sbi); | |
535 | J_ASSERT(list_empty(&sbi->s_orphan)); | |
536 | ||
f98393a6 | 537 | invalidate_bdev(sb->s_bdev); |
ac27a0ec DK |
538 | if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) { |
539 | /* | |
540 | * Invalidate the journal device's buffers. We don't want them | |
541 | * floating about in memory - the physical journal device may | |
542 | * hotswapped, and it breaks the `ro-after' testing code. | |
543 | */ | |
544 | sync_blockdev(sbi->journal_bdev); | |
f98393a6 | 545 | invalidate_bdev(sbi->journal_bdev); |
617ba13b | 546 | ext4_blkdev_remove(sbi); |
ac27a0ec DK |
547 | } |
548 | sb->s_fs_info = NULL; | |
549 | kfree(sbi); | |
550 | return; | |
551 | } | |
552 | ||
e18b890b | 553 | static struct kmem_cache *ext4_inode_cachep; |
ac27a0ec DK |
554 | |
555 | /* | |
556 | * Called inside transaction, so use GFP_NOFS | |
557 | */ | |
617ba13b | 558 | static struct inode *ext4_alloc_inode(struct super_block *sb) |
ac27a0ec | 559 | { |
617ba13b | 560 | struct ext4_inode_info *ei; |
ac27a0ec | 561 | |
e6b4f8da | 562 | ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS); |
ac27a0ec DK |
563 | if (!ei) |
564 | return NULL; | |
617ba13b MC |
565 | #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL |
566 | ei->i_acl = EXT4_ACL_NOT_CACHED; | |
567 | ei->i_default_acl = EXT4_ACL_NOT_CACHED; | |
ac27a0ec DK |
568 | #endif |
569 | ei->i_block_alloc_info = NULL; | |
570 | ei->vfs_inode.i_version = 1; | |
a86c6181 | 571 | memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache)); |
ac27a0ec DK |
572 | return &ei->vfs_inode; |
573 | } | |
574 | ||
617ba13b | 575 | static void ext4_destroy_inode(struct inode *inode) |
ac27a0ec | 576 | { |
9f7dd93d VA |
577 | if (!list_empty(&(EXT4_I(inode)->i_orphan))) { |
578 | printk("EXT4 Inode %p: orphan list check failed!\n", | |
579 | EXT4_I(inode)); | |
580 | print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4, | |
581 | EXT4_I(inode), sizeof(struct ext4_inode_info), | |
582 | true); | |
583 | dump_stack(); | |
584 | } | |
617ba13b | 585 | kmem_cache_free(ext4_inode_cachep, EXT4_I(inode)); |
ac27a0ec DK |
586 | } |
587 | ||
4ba9b9d0 | 588 | static void init_once(struct kmem_cache *cachep, void *foo) |
ac27a0ec | 589 | { |
617ba13b | 590 | struct ext4_inode_info *ei = (struct ext4_inode_info *) foo; |
ac27a0ec | 591 | |
a35afb83 | 592 | INIT_LIST_HEAD(&ei->i_orphan); |
617ba13b | 593 | #ifdef CONFIG_EXT4DEV_FS_XATTR |
a35afb83 | 594 | init_rwsem(&ei->xattr_sem); |
ac27a0ec | 595 | #endif |
0e855ac8 | 596 | init_rwsem(&ei->i_data_sem); |
a35afb83 | 597 | inode_init_once(&ei->vfs_inode); |
ac27a0ec DK |
598 | } |
599 | ||
600 | static int init_inodecache(void) | |
601 | { | |
617ba13b MC |
602 | ext4_inode_cachep = kmem_cache_create("ext4_inode_cache", |
603 | sizeof(struct ext4_inode_info), | |
ac27a0ec DK |
604 | 0, (SLAB_RECLAIM_ACCOUNT| |
605 | SLAB_MEM_SPREAD), | |
20c2df83 | 606 | init_once); |
617ba13b | 607 | if (ext4_inode_cachep == NULL) |
ac27a0ec DK |
608 | return -ENOMEM; |
609 | return 0; | |
610 | } | |
611 | ||
612 | static void destroy_inodecache(void) | |
613 | { | |
617ba13b | 614 | kmem_cache_destroy(ext4_inode_cachep); |
ac27a0ec DK |
615 | } |
616 | ||
617ba13b | 617 | static void ext4_clear_inode(struct inode *inode) |
ac27a0ec | 618 | { |
617ba13b MC |
619 | struct ext4_block_alloc_info *rsv = EXT4_I(inode)->i_block_alloc_info; |
620 | #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL | |
621 | if (EXT4_I(inode)->i_acl && | |
622 | EXT4_I(inode)->i_acl != EXT4_ACL_NOT_CACHED) { | |
623 | posix_acl_release(EXT4_I(inode)->i_acl); | |
624 | EXT4_I(inode)->i_acl = EXT4_ACL_NOT_CACHED; | |
625 | } | |
626 | if (EXT4_I(inode)->i_default_acl && | |
627 | EXT4_I(inode)->i_default_acl != EXT4_ACL_NOT_CACHED) { | |
628 | posix_acl_release(EXT4_I(inode)->i_default_acl); | |
629 | EXT4_I(inode)->i_default_acl = EXT4_ACL_NOT_CACHED; | |
ac27a0ec DK |
630 | } |
631 | #endif | |
617ba13b MC |
632 | ext4_discard_reservation(inode); |
633 | EXT4_I(inode)->i_block_alloc_info = NULL; | |
ac27a0ec DK |
634 | if (unlikely(rsv)) |
635 | kfree(rsv); | |
636 | } | |
637 | ||
617ba13b | 638 | static inline void ext4_show_quota_options(struct seq_file *seq, struct super_block *sb) |
ac27a0ec DK |
639 | { |
640 | #if defined(CONFIG_QUOTA) | |
617ba13b | 641 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
ac27a0ec DK |
642 | |
643 | if (sbi->s_jquota_fmt) | |
644 | seq_printf(seq, ",jqfmt=%s", | |
645 | (sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold": "vfsv0"); | |
646 | ||
647 | if (sbi->s_qf_names[USRQUOTA]) | |
648 | seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]); | |
649 | ||
650 | if (sbi->s_qf_names[GRPQUOTA]) | |
651 | seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]); | |
652 | ||
617ba13b | 653 | if (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA) |
ac27a0ec DK |
654 | seq_puts(seq, ",usrquota"); |
655 | ||
617ba13b | 656 | if (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA) |
ac27a0ec DK |
657 | seq_puts(seq, ",grpquota"); |
658 | #endif | |
659 | } | |
660 | ||
d9c9bef1 MS |
661 | /* |
662 | * Show an option if | |
663 | * - it's set to a non-default value OR | |
664 | * - if the per-sb default is different from the global default | |
665 | */ | |
617ba13b | 666 | static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs) |
ac27a0ec DK |
667 | { |
668 | struct super_block *sb = vfs->mnt_sb; | |
d9c9bef1 MS |
669 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
670 | struct ext4_super_block *es = sbi->s_es; | |
671 | unsigned long def_mount_opts; | |
672 | ||
673 | def_mount_opts = le32_to_cpu(es->s_default_mount_opts); | |
674 | ||
675 | if (sbi->s_sb_block != 1) | |
676 | seq_printf(seq, ",sb=%llu", sbi->s_sb_block); | |
677 | if (test_opt(sb, MINIX_DF)) | |
678 | seq_puts(seq, ",minixdf"); | |
679 | if (test_opt(sb, GRPID)) | |
680 | seq_puts(seq, ",grpid"); | |
681 | if (!test_opt(sb, GRPID) && (def_mount_opts & EXT4_DEFM_BSDGROUPS)) | |
682 | seq_puts(seq, ",nogrpid"); | |
683 | if (sbi->s_resuid != EXT4_DEF_RESUID || | |
684 | le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID) { | |
685 | seq_printf(seq, ",resuid=%u", sbi->s_resuid); | |
686 | } | |
687 | if (sbi->s_resgid != EXT4_DEF_RESGID || | |
688 | le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID) { | |
689 | seq_printf(seq, ",resgid=%u", sbi->s_resgid); | |
690 | } | |
bb4f397a | 691 | if (test_opt(sb, ERRORS_RO)) { |
d9c9bef1 MS |
692 | int def_errors = le16_to_cpu(es->s_errors); |
693 | ||
694 | if (def_errors == EXT4_ERRORS_PANIC || | |
bb4f397a AK |
695 | def_errors == EXT4_ERRORS_CONTINUE) { |
696 | seq_puts(seq, ",errors=remount-ro"); | |
d9c9bef1 MS |
697 | } |
698 | } | |
bb4f397a AK |
699 | if (test_opt(sb, ERRORS_CONT)) |
700 | seq_puts(seq, ",errors=continue"); | |
d9c9bef1 MS |
701 | if (test_opt(sb, ERRORS_PANIC)) |
702 | seq_puts(seq, ",errors=panic"); | |
703 | if (test_opt(sb, NO_UID32)) | |
704 | seq_puts(seq, ",nouid32"); | |
705 | if (test_opt(sb, DEBUG)) | |
706 | seq_puts(seq, ",debug"); | |
707 | if (test_opt(sb, OLDALLOC)) | |
708 | seq_puts(seq, ",oldalloc"); | |
07620f69 | 709 | #ifdef CONFIG_EXT4DEV_FS_XATTR |
d9c9bef1 MS |
710 | if (test_opt(sb, XATTR_USER)) |
711 | seq_puts(seq, ",user_xattr"); | |
712 | if (!test_opt(sb, XATTR_USER) && | |
713 | (def_mount_opts & EXT4_DEFM_XATTR_USER)) { | |
714 | seq_puts(seq, ",nouser_xattr"); | |
715 | } | |
716 | #endif | |
07620f69 | 717 | #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL |
d9c9bef1 MS |
718 | if (test_opt(sb, POSIX_ACL)) |
719 | seq_puts(seq, ",acl"); | |
720 | if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT4_DEFM_ACL)) | |
721 | seq_puts(seq, ",noacl"); | |
722 | #endif | |
723 | if (!test_opt(sb, RESERVATION)) | |
724 | seq_puts(seq, ",noreservation"); | |
725 | if (sbi->s_commit_interval) { | |
726 | seq_printf(seq, ",commit=%u", | |
727 | (unsigned) (sbi->s_commit_interval / HZ)); | |
728 | } | |
729 | if (test_opt(sb, BARRIER)) | |
730 | seq_puts(seq, ",barrier=1"); | |
731 | if (test_opt(sb, NOBH)) | |
732 | seq_puts(seq, ",nobh"); | |
733 | if (!test_opt(sb, EXTENTS)) | |
734 | seq_puts(seq, ",noextents"); | |
ac27a0ec | 735 | |
617ba13b | 736 | if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) |
ac27a0ec | 737 | seq_puts(seq, ",data=journal"); |
617ba13b | 738 | else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) |
ac27a0ec | 739 | seq_puts(seq, ",data=ordered"); |
617ba13b | 740 | else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA) |
ac27a0ec DK |
741 | seq_puts(seq, ",data=writeback"); |
742 | ||
617ba13b | 743 | ext4_show_quota_options(seq, sb); |
ac27a0ec DK |
744 | |
745 | return 0; | |
746 | } | |
747 | ||
748 | ||
1b961ac0 CH |
749 | static struct inode *ext4_nfs_get_inode(struct super_block *sb, |
750 | u64 ino, u32 generation) | |
ac27a0ec | 751 | { |
ac27a0ec | 752 | struct inode *inode; |
ac27a0ec | 753 | |
617ba13b | 754 | if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO) |
ac27a0ec | 755 | return ERR_PTR(-ESTALE); |
617ba13b | 756 | if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)) |
ac27a0ec DK |
757 | return ERR_PTR(-ESTALE); |
758 | ||
759 | /* iget isn't really right if the inode is currently unallocated!! | |
760 | * | |
617ba13b | 761 | * ext4_read_inode will return a bad_inode if the inode had been |
ac27a0ec DK |
762 | * deleted, so we should be safe. |
763 | * | |
764 | * Currently we don't know the generation for parent directory, so | |
765 | * a generation of 0 means "accept any" | |
766 | */ | |
767 | inode = iget(sb, ino); | |
768 | if (inode == NULL) | |
769 | return ERR_PTR(-ENOMEM); | |
770 | if (is_bad_inode(inode) || | |
771 | (generation && inode->i_generation != generation)) { | |
772 | iput(inode); | |
773 | return ERR_PTR(-ESTALE); | |
774 | } | |
1b961ac0 CH |
775 | |
776 | return inode; | |
777 | } | |
778 | ||
779 | static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid, | |
780 | int fh_len, int fh_type) | |
781 | { | |
782 | return generic_fh_to_dentry(sb, fid, fh_len, fh_type, | |
783 | ext4_nfs_get_inode); | |
784 | } | |
785 | ||
786 | static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid, | |
787 | int fh_len, int fh_type) | |
788 | { | |
789 | return generic_fh_to_parent(sb, fid, fh_len, fh_type, | |
790 | ext4_nfs_get_inode); | |
ac27a0ec DK |
791 | } |
792 | ||
793 | #ifdef CONFIG_QUOTA | |
794 | #define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group") | |
795 | #define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA)) | |
796 | ||
617ba13b MC |
797 | static int ext4_dquot_initialize(struct inode *inode, int type); |
798 | static int ext4_dquot_drop(struct inode *inode); | |
799 | static int ext4_write_dquot(struct dquot *dquot); | |
800 | static int ext4_acquire_dquot(struct dquot *dquot); | |
801 | static int ext4_release_dquot(struct dquot *dquot); | |
802 | static int ext4_mark_dquot_dirty(struct dquot *dquot); | |
803 | static int ext4_write_info(struct super_block *sb, int type); | |
804 | static int ext4_quota_on(struct super_block *sb, int type, int format_id, char *path); | |
805 | static int ext4_quota_on_mount(struct super_block *sb, int type); | |
806 | static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data, | |
ac27a0ec | 807 | size_t len, loff_t off); |
617ba13b | 808 | static ssize_t ext4_quota_write(struct super_block *sb, int type, |
ac27a0ec DK |
809 | const char *data, size_t len, loff_t off); |
810 | ||
617ba13b MC |
811 | static struct dquot_operations ext4_quota_operations = { |
812 | .initialize = ext4_dquot_initialize, | |
813 | .drop = ext4_dquot_drop, | |
ac27a0ec DK |
814 | .alloc_space = dquot_alloc_space, |
815 | .alloc_inode = dquot_alloc_inode, | |
816 | .free_space = dquot_free_space, | |
817 | .free_inode = dquot_free_inode, | |
818 | .transfer = dquot_transfer, | |
617ba13b MC |
819 | .write_dquot = ext4_write_dquot, |
820 | .acquire_dquot = ext4_acquire_dquot, | |
821 | .release_dquot = ext4_release_dquot, | |
822 | .mark_dirty = ext4_mark_dquot_dirty, | |
823 | .write_info = ext4_write_info | |
ac27a0ec DK |
824 | }; |
825 | ||
617ba13b MC |
826 | static struct quotactl_ops ext4_qctl_operations = { |
827 | .quota_on = ext4_quota_on, | |
ac27a0ec DK |
828 | .quota_off = vfs_quota_off, |
829 | .quota_sync = vfs_quota_sync, | |
830 | .get_info = vfs_get_dqinfo, | |
831 | .set_info = vfs_set_dqinfo, | |
832 | .get_dqblk = vfs_get_dqblk, | |
833 | .set_dqblk = vfs_set_dqblk | |
834 | }; | |
835 | #endif | |
836 | ||
ee9b6d61 | 837 | static const struct super_operations ext4_sops = { |
617ba13b MC |
838 | .alloc_inode = ext4_alloc_inode, |
839 | .destroy_inode = ext4_destroy_inode, | |
840 | .read_inode = ext4_read_inode, | |
841 | .write_inode = ext4_write_inode, | |
842 | .dirty_inode = ext4_dirty_inode, | |
843 | .delete_inode = ext4_delete_inode, | |
844 | .put_super = ext4_put_super, | |
845 | .write_super = ext4_write_super, | |
846 | .sync_fs = ext4_sync_fs, | |
847 | .write_super_lockfs = ext4_write_super_lockfs, | |
848 | .unlockfs = ext4_unlockfs, | |
849 | .statfs = ext4_statfs, | |
850 | .remount_fs = ext4_remount, | |
851 | .clear_inode = ext4_clear_inode, | |
852 | .show_options = ext4_show_options, | |
ac27a0ec | 853 | #ifdef CONFIG_QUOTA |
617ba13b MC |
854 | .quota_read = ext4_quota_read, |
855 | .quota_write = ext4_quota_write, | |
ac27a0ec DK |
856 | #endif |
857 | }; | |
858 | ||
39655164 | 859 | static const struct export_operations ext4_export_ops = { |
1b961ac0 CH |
860 | .fh_to_dentry = ext4_fh_to_dentry, |
861 | .fh_to_parent = ext4_fh_to_parent, | |
617ba13b | 862 | .get_parent = ext4_get_parent, |
ac27a0ec DK |
863 | }; |
864 | ||
865 | enum { | |
866 | Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid, | |
867 | Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro, | |
868 | Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov, | |
869 | Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl, | |
870 | Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh, | |
871 | Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev, | |
872 | Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback, | |
873 | Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota, | |
874 | Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota, | |
875 | Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota, | |
1e2462f9 | 876 | Opt_grpquota, Opt_extents, Opt_noextents, |
ac27a0ec DK |
877 | }; |
878 | ||
879 | static match_table_t tokens = { | |
880 | {Opt_bsd_df, "bsddf"}, | |
881 | {Opt_minix_df, "minixdf"}, | |
882 | {Opt_grpid, "grpid"}, | |
883 | {Opt_grpid, "bsdgroups"}, | |
884 | {Opt_nogrpid, "nogrpid"}, | |
885 | {Opt_nogrpid, "sysvgroups"}, | |
886 | {Opt_resgid, "resgid=%u"}, | |
887 | {Opt_resuid, "resuid=%u"}, | |
888 | {Opt_sb, "sb=%u"}, | |
889 | {Opt_err_cont, "errors=continue"}, | |
890 | {Opt_err_panic, "errors=panic"}, | |
891 | {Opt_err_ro, "errors=remount-ro"}, | |
892 | {Opt_nouid32, "nouid32"}, | |
893 | {Opt_nocheck, "nocheck"}, | |
894 | {Opt_nocheck, "check=none"}, | |
895 | {Opt_debug, "debug"}, | |
896 | {Opt_oldalloc, "oldalloc"}, | |
897 | {Opt_orlov, "orlov"}, | |
898 | {Opt_user_xattr, "user_xattr"}, | |
899 | {Opt_nouser_xattr, "nouser_xattr"}, | |
900 | {Opt_acl, "acl"}, | |
901 | {Opt_noacl, "noacl"}, | |
902 | {Opt_reservation, "reservation"}, | |
903 | {Opt_noreservation, "noreservation"}, | |
904 | {Opt_noload, "noload"}, | |
905 | {Opt_nobh, "nobh"}, | |
906 | {Opt_bh, "bh"}, | |
907 | {Opt_commit, "commit=%u"}, | |
908 | {Opt_journal_update, "journal=update"}, | |
909 | {Opt_journal_inum, "journal=%u"}, | |
910 | {Opt_journal_dev, "journal_dev=%u"}, | |
911 | {Opt_abort, "abort"}, | |
912 | {Opt_data_journal, "data=journal"}, | |
913 | {Opt_data_ordered, "data=ordered"}, | |
914 | {Opt_data_writeback, "data=writeback"}, | |
915 | {Opt_offusrjquota, "usrjquota="}, | |
916 | {Opt_usrjquota, "usrjquota=%s"}, | |
917 | {Opt_offgrpjquota, "grpjquota="}, | |
918 | {Opt_grpjquota, "grpjquota=%s"}, | |
919 | {Opt_jqfmt_vfsold, "jqfmt=vfsold"}, | |
920 | {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"}, | |
921 | {Opt_grpquota, "grpquota"}, | |
922 | {Opt_noquota, "noquota"}, | |
923 | {Opt_quota, "quota"}, | |
924 | {Opt_usrquota, "usrquota"}, | |
925 | {Opt_barrier, "barrier=%u"}, | |
a86c6181 | 926 | {Opt_extents, "extents"}, |
1e2462f9 | 927 | {Opt_noextents, "noextents"}, |
ac27a0ec DK |
928 | {Opt_err, NULL}, |
929 | {Opt_resize, "resize"}, | |
930 | }; | |
931 | ||
617ba13b | 932 | static ext4_fsblk_t get_sb_block(void **data) |
ac27a0ec | 933 | { |
617ba13b | 934 | ext4_fsblk_t sb_block; |
ac27a0ec DK |
935 | char *options = (char *) *data; |
936 | ||
937 | if (!options || strncmp(options, "sb=", 3) != 0) | |
938 | return 1; /* Default location */ | |
939 | options += 3; | |
617ba13b | 940 | /*todo: use simple_strtoll with >32bit ext4 */ |
ac27a0ec DK |
941 | sb_block = simple_strtoul(options, &options, 0); |
942 | if (*options && *options != ',') { | |
617ba13b | 943 | printk("EXT4-fs: Invalid sb specification: %s\n", |
ac27a0ec DK |
944 | (char *) *data); |
945 | return 1; | |
946 | } | |
947 | if (*options == ',') | |
948 | options++; | |
949 | *data = (void *) options; | |
950 | return sb_block; | |
951 | } | |
952 | ||
953 | static int parse_options (char *options, struct super_block *sb, | |
954 | unsigned int *inum, unsigned long *journal_devnum, | |
617ba13b | 955 | ext4_fsblk_t *n_blocks_count, int is_remount) |
ac27a0ec | 956 | { |
617ba13b | 957 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
ac27a0ec DK |
958 | char * p; |
959 | substring_t args[MAX_OPT_ARGS]; | |
960 | int data_opt = 0; | |
961 | int option; | |
962 | #ifdef CONFIG_QUOTA | |
963 | int qtype; | |
964 | char *qname; | |
965 | #endif | |
966 | ||
967 | if (!options) | |
968 | return 1; | |
969 | ||
970 | while ((p = strsep (&options, ",")) != NULL) { | |
971 | int token; | |
972 | if (!*p) | |
973 | continue; | |
974 | ||
975 | token = match_token(p, tokens, args); | |
976 | switch (token) { | |
977 | case Opt_bsd_df: | |
978 | clear_opt (sbi->s_mount_opt, MINIX_DF); | |
979 | break; | |
980 | case Opt_minix_df: | |
981 | set_opt (sbi->s_mount_opt, MINIX_DF); | |
982 | break; | |
983 | case Opt_grpid: | |
984 | set_opt (sbi->s_mount_opt, GRPID); | |
985 | break; | |
986 | case Opt_nogrpid: | |
987 | clear_opt (sbi->s_mount_opt, GRPID); | |
988 | break; | |
989 | case Opt_resuid: | |
990 | if (match_int(&args[0], &option)) | |
991 | return 0; | |
992 | sbi->s_resuid = option; | |
993 | break; | |
994 | case Opt_resgid: | |
995 | if (match_int(&args[0], &option)) | |
996 | return 0; | |
997 | sbi->s_resgid = option; | |
998 | break; | |
999 | case Opt_sb: | |
1000 | /* handled by get_sb_block() instead of here */ | |
1001 | /* *sb_block = match_int(&args[0]); */ | |
1002 | break; | |
1003 | case Opt_err_panic: | |
1004 | clear_opt (sbi->s_mount_opt, ERRORS_CONT); | |
1005 | clear_opt (sbi->s_mount_opt, ERRORS_RO); | |
1006 | set_opt (sbi->s_mount_opt, ERRORS_PANIC); | |
1007 | break; | |
1008 | case Opt_err_ro: | |
1009 | clear_opt (sbi->s_mount_opt, ERRORS_CONT); | |
1010 | clear_opt (sbi->s_mount_opt, ERRORS_PANIC); | |
1011 | set_opt (sbi->s_mount_opt, ERRORS_RO); | |
1012 | break; | |
1013 | case Opt_err_cont: | |
1014 | clear_opt (sbi->s_mount_opt, ERRORS_RO); | |
1015 | clear_opt (sbi->s_mount_opt, ERRORS_PANIC); | |
1016 | set_opt (sbi->s_mount_opt, ERRORS_CONT); | |
1017 | break; | |
1018 | case Opt_nouid32: | |
1019 | set_opt (sbi->s_mount_opt, NO_UID32); | |
1020 | break; | |
1021 | case Opt_nocheck: | |
1022 | clear_opt (sbi->s_mount_opt, CHECK); | |
1023 | break; | |
1024 | case Opt_debug: | |
1025 | set_opt (sbi->s_mount_opt, DEBUG); | |
1026 | break; | |
1027 | case Opt_oldalloc: | |
1028 | set_opt (sbi->s_mount_opt, OLDALLOC); | |
1029 | break; | |
1030 | case Opt_orlov: | |
1031 | clear_opt (sbi->s_mount_opt, OLDALLOC); | |
1032 | break; | |
617ba13b | 1033 | #ifdef CONFIG_EXT4DEV_FS_XATTR |
ac27a0ec DK |
1034 | case Opt_user_xattr: |
1035 | set_opt (sbi->s_mount_opt, XATTR_USER); | |
1036 | break; | |
1037 | case Opt_nouser_xattr: | |
1038 | clear_opt (sbi->s_mount_opt, XATTR_USER); | |
1039 | break; | |
1040 | #else | |
1041 | case Opt_user_xattr: | |
1042 | case Opt_nouser_xattr: | |
617ba13b | 1043 | printk("EXT4 (no)user_xattr options not supported\n"); |
ac27a0ec DK |
1044 | break; |
1045 | #endif | |
617ba13b | 1046 | #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL |
ac27a0ec DK |
1047 | case Opt_acl: |
1048 | set_opt(sbi->s_mount_opt, POSIX_ACL); | |
1049 | break; | |
1050 | case Opt_noacl: | |
1051 | clear_opt(sbi->s_mount_opt, POSIX_ACL); | |
1052 | break; | |
1053 | #else | |
1054 | case Opt_acl: | |
1055 | case Opt_noacl: | |
617ba13b | 1056 | printk("EXT4 (no)acl options not supported\n"); |
ac27a0ec DK |
1057 | break; |
1058 | #endif | |
1059 | case Opt_reservation: | |
1060 | set_opt(sbi->s_mount_opt, RESERVATION); | |
1061 | break; | |
1062 | case Opt_noreservation: | |
1063 | clear_opt(sbi->s_mount_opt, RESERVATION); | |
1064 | break; | |
1065 | case Opt_journal_update: | |
1066 | /* @@@ FIXME */ | |
1067 | /* Eventually we will want to be able to create | |
1068 | a journal file here. For now, only allow the | |
1069 | user to specify an existing inode to be the | |
1070 | journal file. */ | |
1071 | if (is_remount) { | |
617ba13b | 1072 | printk(KERN_ERR "EXT4-fs: cannot specify " |
ac27a0ec DK |
1073 | "journal on remount\n"); |
1074 | return 0; | |
1075 | } | |
1076 | set_opt (sbi->s_mount_opt, UPDATE_JOURNAL); | |
1077 | break; | |
1078 | case Opt_journal_inum: | |
1079 | if (is_remount) { | |
617ba13b | 1080 | printk(KERN_ERR "EXT4-fs: cannot specify " |
ac27a0ec DK |
1081 | "journal on remount\n"); |
1082 | return 0; | |
1083 | } | |
1084 | if (match_int(&args[0], &option)) | |
1085 | return 0; | |
1086 | *inum = option; | |
1087 | break; | |
1088 | case Opt_journal_dev: | |
1089 | if (is_remount) { | |
617ba13b | 1090 | printk(KERN_ERR "EXT4-fs: cannot specify " |
ac27a0ec DK |
1091 | "journal on remount\n"); |
1092 | return 0; | |
1093 | } | |
1094 | if (match_int(&args[0], &option)) | |
1095 | return 0; | |
1096 | *journal_devnum = option; | |
1097 | break; | |
1098 | case Opt_noload: | |
1099 | set_opt (sbi->s_mount_opt, NOLOAD); | |
1100 | break; | |
1101 | case Opt_commit: | |
1102 | if (match_int(&args[0], &option)) | |
1103 | return 0; | |
1104 | if (option < 0) | |
1105 | return 0; | |
1106 | if (option == 0) | |
cd02ff0b | 1107 | option = JBD2_DEFAULT_MAX_COMMIT_AGE; |
ac27a0ec DK |
1108 | sbi->s_commit_interval = HZ * option; |
1109 | break; | |
1110 | case Opt_data_journal: | |
617ba13b | 1111 | data_opt = EXT4_MOUNT_JOURNAL_DATA; |
ac27a0ec DK |
1112 | goto datacheck; |
1113 | case Opt_data_ordered: | |
617ba13b | 1114 | data_opt = EXT4_MOUNT_ORDERED_DATA; |
ac27a0ec DK |
1115 | goto datacheck; |
1116 | case Opt_data_writeback: | |
617ba13b | 1117 | data_opt = EXT4_MOUNT_WRITEBACK_DATA; |
ac27a0ec DK |
1118 | datacheck: |
1119 | if (is_remount) { | |
617ba13b | 1120 | if ((sbi->s_mount_opt & EXT4_MOUNT_DATA_FLAGS) |
ac27a0ec DK |
1121 | != data_opt) { |
1122 | printk(KERN_ERR | |
617ba13b | 1123 | "EXT4-fs: cannot change data " |
ac27a0ec DK |
1124 | "mode on remount\n"); |
1125 | return 0; | |
1126 | } | |
1127 | } else { | |
617ba13b | 1128 | sbi->s_mount_opt &= ~EXT4_MOUNT_DATA_FLAGS; |
ac27a0ec DK |
1129 | sbi->s_mount_opt |= data_opt; |
1130 | } | |
1131 | break; | |
1132 | #ifdef CONFIG_QUOTA | |
1133 | case Opt_usrjquota: | |
1134 | qtype = USRQUOTA; | |
1135 | goto set_qf_name; | |
1136 | case Opt_grpjquota: | |
1137 | qtype = GRPQUOTA; | |
1138 | set_qf_name: | |
1139 | if (sb_any_quota_enabled(sb)) { | |
1140 | printk(KERN_ERR | |
617ba13b | 1141 | "EXT4-fs: Cannot change journalled " |
ac27a0ec DK |
1142 | "quota options when quota turned on.\n"); |
1143 | return 0; | |
1144 | } | |
1145 | qname = match_strdup(&args[0]); | |
1146 | if (!qname) { | |
1147 | printk(KERN_ERR | |
617ba13b | 1148 | "EXT4-fs: not enough memory for " |
ac27a0ec DK |
1149 | "storing quotafile name.\n"); |
1150 | return 0; | |
1151 | } | |
1152 | if (sbi->s_qf_names[qtype] && | |
1153 | strcmp(sbi->s_qf_names[qtype], qname)) { | |
1154 | printk(KERN_ERR | |
617ba13b | 1155 | "EXT4-fs: %s quota file already " |
ac27a0ec DK |
1156 | "specified.\n", QTYPE2NAME(qtype)); |
1157 | kfree(qname); | |
1158 | return 0; | |
1159 | } | |
1160 | sbi->s_qf_names[qtype] = qname; | |
1161 | if (strchr(sbi->s_qf_names[qtype], '/')) { | |
1162 | printk(KERN_ERR | |
617ba13b | 1163 | "EXT4-fs: quotafile must be on " |
ac27a0ec DK |
1164 | "filesystem root.\n"); |
1165 | kfree(sbi->s_qf_names[qtype]); | |
1166 | sbi->s_qf_names[qtype] = NULL; | |
1167 | return 0; | |
1168 | } | |
1169 | set_opt(sbi->s_mount_opt, QUOTA); | |
1170 | break; | |
1171 | case Opt_offusrjquota: | |
1172 | qtype = USRQUOTA; | |
1173 | goto clear_qf_name; | |
1174 | case Opt_offgrpjquota: | |
1175 | qtype = GRPQUOTA; | |
1176 | clear_qf_name: | |
1177 | if (sb_any_quota_enabled(sb)) { | |
617ba13b | 1178 | printk(KERN_ERR "EXT4-fs: Cannot change " |
ac27a0ec DK |
1179 | "journalled quota options when " |
1180 | "quota turned on.\n"); | |
1181 | return 0; | |
1182 | } | |
1183 | /* | |
1184 | * The space will be released later when all options | |
1185 | * are confirmed to be correct | |
1186 | */ | |
1187 | sbi->s_qf_names[qtype] = NULL; | |
1188 | break; | |
1189 | case Opt_jqfmt_vfsold: | |
1190 | sbi->s_jquota_fmt = QFMT_VFS_OLD; | |
1191 | break; | |
1192 | case Opt_jqfmt_vfsv0: | |
1193 | sbi->s_jquota_fmt = QFMT_VFS_V0; | |
1194 | break; | |
1195 | case Opt_quota: | |
1196 | case Opt_usrquota: | |
1197 | set_opt(sbi->s_mount_opt, QUOTA); | |
1198 | set_opt(sbi->s_mount_opt, USRQUOTA); | |
1199 | break; | |
1200 | case Opt_grpquota: | |
1201 | set_opt(sbi->s_mount_opt, QUOTA); | |
1202 | set_opt(sbi->s_mount_opt, GRPQUOTA); | |
1203 | break; | |
1204 | case Opt_noquota: | |
1205 | if (sb_any_quota_enabled(sb)) { | |
617ba13b | 1206 | printk(KERN_ERR "EXT4-fs: Cannot change quota " |
ac27a0ec DK |
1207 | "options when quota turned on.\n"); |
1208 | return 0; | |
1209 | } | |
1210 | clear_opt(sbi->s_mount_opt, QUOTA); | |
1211 | clear_opt(sbi->s_mount_opt, USRQUOTA); | |
1212 | clear_opt(sbi->s_mount_opt, GRPQUOTA); | |
1213 | break; | |
1214 | #else | |
1215 | case Opt_quota: | |
1216 | case Opt_usrquota: | |
1217 | case Opt_grpquota: | |
1218 | case Opt_usrjquota: | |
1219 | case Opt_grpjquota: | |
1220 | case Opt_offusrjquota: | |
1221 | case Opt_offgrpjquota: | |
1222 | case Opt_jqfmt_vfsold: | |
1223 | case Opt_jqfmt_vfsv0: | |
1224 | printk(KERN_ERR | |
617ba13b | 1225 | "EXT4-fs: journalled quota options not " |
ac27a0ec DK |
1226 | "supported.\n"); |
1227 | break; | |
1228 | case Opt_noquota: | |
1229 | break; | |
1230 | #endif | |
1231 | case Opt_abort: | |
1232 | set_opt(sbi->s_mount_opt, ABORT); | |
1233 | break; | |
1234 | case Opt_barrier: | |
1235 | if (match_int(&args[0], &option)) | |
1236 | return 0; | |
1237 | if (option) | |
1238 | set_opt(sbi->s_mount_opt, BARRIER); | |
1239 | else | |
1240 | clear_opt(sbi->s_mount_opt, BARRIER); | |
1241 | break; | |
1242 | case Opt_ignore: | |
1243 | break; | |
1244 | case Opt_resize: | |
1245 | if (!is_remount) { | |
617ba13b | 1246 | printk("EXT4-fs: resize option only available " |
ac27a0ec DK |
1247 | "for remount\n"); |
1248 | return 0; | |
1249 | } | |
1250 | if (match_int(&args[0], &option) != 0) | |
1251 | return 0; | |
1252 | *n_blocks_count = option; | |
1253 | break; | |
1254 | case Opt_nobh: | |
1255 | set_opt(sbi->s_mount_opt, NOBH); | |
1256 | break; | |
1257 | case Opt_bh: | |
1258 | clear_opt(sbi->s_mount_opt, NOBH); | |
1259 | break; | |
a86c6181 AT |
1260 | case Opt_extents: |
1261 | set_opt (sbi->s_mount_opt, EXTENTS); | |
1262 | break; | |
1e2462f9 MC |
1263 | case Opt_noextents: |
1264 | clear_opt (sbi->s_mount_opt, EXTENTS); | |
1265 | break; | |
ac27a0ec DK |
1266 | default: |
1267 | printk (KERN_ERR | |
617ba13b | 1268 | "EXT4-fs: Unrecognized mount option \"%s\" " |
ac27a0ec DK |
1269 | "or missing value\n", p); |
1270 | return 0; | |
1271 | } | |
1272 | } | |
1273 | #ifdef CONFIG_QUOTA | |
1274 | if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) { | |
617ba13b | 1275 | if ((sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA) && |
ac27a0ec DK |
1276 | sbi->s_qf_names[USRQUOTA]) |
1277 | clear_opt(sbi->s_mount_opt, USRQUOTA); | |
1278 | ||
617ba13b | 1279 | if ((sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA) && |
ac27a0ec DK |
1280 | sbi->s_qf_names[GRPQUOTA]) |
1281 | clear_opt(sbi->s_mount_opt, GRPQUOTA); | |
1282 | ||
1283 | if ((sbi->s_qf_names[USRQUOTA] && | |
617ba13b | 1284 | (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)) || |
ac27a0ec | 1285 | (sbi->s_qf_names[GRPQUOTA] && |
617ba13b MC |
1286 | (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA))) { |
1287 | printk(KERN_ERR "EXT4-fs: old and new quota " | |
ac27a0ec DK |
1288 | "format mixing.\n"); |
1289 | return 0; | |
1290 | } | |
1291 | ||
1292 | if (!sbi->s_jquota_fmt) { | |
617ba13b | 1293 | printk(KERN_ERR "EXT4-fs: journalled quota format " |
ac27a0ec DK |
1294 | "not specified.\n"); |
1295 | return 0; | |
1296 | } | |
1297 | } else { | |
1298 | if (sbi->s_jquota_fmt) { | |
617ba13b | 1299 | printk(KERN_ERR "EXT4-fs: journalled quota format " |
ac27a0ec DK |
1300 | "specified with no journalling " |
1301 | "enabled.\n"); | |
1302 | return 0; | |
1303 | } | |
1304 | } | |
1305 | #endif | |
1306 | return 1; | |
1307 | } | |
1308 | ||
617ba13b | 1309 | static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es, |
ac27a0ec DK |
1310 | int read_only) |
1311 | { | |
617ba13b | 1312 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
ac27a0ec DK |
1313 | int res = 0; |
1314 | ||
617ba13b MC |
1315 | if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) { |
1316 | printk (KERN_ERR "EXT4-fs warning: revision level too high, " | |
ac27a0ec DK |
1317 | "forcing read-only mode\n"); |
1318 | res = MS_RDONLY; | |
1319 | } | |
1320 | if (read_only) | |
1321 | return res; | |
617ba13b MC |
1322 | if (!(sbi->s_mount_state & EXT4_VALID_FS)) |
1323 | printk (KERN_WARNING "EXT4-fs warning: mounting unchecked fs, " | |
ac27a0ec | 1324 | "running e2fsck is recommended\n"); |
617ba13b | 1325 | else if ((sbi->s_mount_state & EXT4_ERROR_FS)) |
ac27a0ec | 1326 | printk (KERN_WARNING |
617ba13b | 1327 | "EXT4-fs warning: mounting fs with errors, " |
ac27a0ec DK |
1328 | "running e2fsck is recommended\n"); |
1329 | else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 && | |
1330 | le16_to_cpu(es->s_mnt_count) >= | |
1331 | (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count)) | |
1332 | printk (KERN_WARNING | |
617ba13b | 1333 | "EXT4-fs warning: maximal mount count reached, " |
ac27a0ec DK |
1334 | "running e2fsck is recommended\n"); |
1335 | else if (le32_to_cpu(es->s_checkinterval) && | |
1336 | (le32_to_cpu(es->s_lastcheck) + | |
1337 | le32_to_cpu(es->s_checkinterval) <= get_seconds())) | |
1338 | printk (KERN_WARNING | |
617ba13b | 1339 | "EXT4-fs warning: checktime reached, " |
ac27a0ec DK |
1340 | "running e2fsck is recommended\n"); |
1341 | #if 0 | |
1342 | /* @@@ We _will_ want to clear the valid bit if we find | |
63f57933 AM |
1343 | * inconsistencies, to force a fsck at reboot. But for |
1344 | * a plain journaled filesystem we can keep it set as | |
1345 | * valid forever! :) | |
1346 | */ | |
617ba13b | 1347 | es->s_state = cpu_to_le16(le16_to_cpu(es->s_state) & ~EXT4_VALID_FS); |
ac27a0ec DK |
1348 | #endif |
1349 | if (!(__s16) le16_to_cpu(es->s_max_mnt_count)) | |
617ba13b | 1350 | es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT); |
ac27a0ec DK |
1351 | es->s_mnt_count=cpu_to_le16(le16_to_cpu(es->s_mnt_count) + 1); |
1352 | es->s_mtime = cpu_to_le32(get_seconds()); | |
617ba13b MC |
1353 | ext4_update_dynamic_rev(sb); |
1354 | EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); | |
ac27a0ec | 1355 | |
617ba13b | 1356 | ext4_commit_super(sb, es, 1); |
ac27a0ec | 1357 | if (test_opt(sb, DEBUG)) |
617ba13b | 1358 | printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%lu, " |
ac27a0ec DK |
1359 | "bpg=%lu, ipg=%lu, mo=%04lx]\n", |
1360 | sb->s_blocksize, | |
1361 | sbi->s_groups_count, | |
617ba13b MC |
1362 | EXT4_BLOCKS_PER_GROUP(sb), |
1363 | EXT4_INODES_PER_GROUP(sb), | |
ac27a0ec DK |
1364 | sbi->s_mount_opt); |
1365 | ||
617ba13b MC |
1366 | printk(KERN_INFO "EXT4 FS on %s, ", sb->s_id); |
1367 | if (EXT4_SB(sb)->s_journal->j_inode == NULL) { | |
ac27a0ec DK |
1368 | char b[BDEVNAME_SIZE]; |
1369 | ||
1370 | printk("external journal on %s\n", | |
617ba13b | 1371 | bdevname(EXT4_SB(sb)->s_journal->j_dev, b)); |
ac27a0ec DK |
1372 | } else { |
1373 | printk("internal journal\n"); | |
1374 | } | |
1375 | return res; | |
1376 | } | |
1377 | ||
717d50e4 AD |
1378 | __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group, |
1379 | struct ext4_group_desc *gdp) | |
1380 | { | |
1381 | __u16 crc = 0; | |
1382 | ||
1383 | if (sbi->s_es->s_feature_ro_compat & | |
1384 | cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) { | |
1385 | int offset = offsetof(struct ext4_group_desc, bg_checksum); | |
1386 | __le32 le_group = cpu_to_le32(block_group); | |
1387 | ||
1388 | crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid)); | |
1389 | crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group)); | |
1390 | crc = crc16(crc, (__u8 *)gdp, offset); | |
1391 | offset += sizeof(gdp->bg_checksum); /* skip checksum */ | |
1392 | /* for checksum of struct ext4_group_desc do the rest...*/ | |
1393 | if ((sbi->s_es->s_feature_incompat & | |
1394 | cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) && | |
1395 | offset < le16_to_cpu(sbi->s_es->s_desc_size)) | |
1396 | crc = crc16(crc, (__u8 *)gdp + offset, | |
1397 | le16_to_cpu(sbi->s_es->s_desc_size) - | |
1398 | offset); | |
1399 | } | |
1400 | ||
1401 | return cpu_to_le16(crc); | |
1402 | } | |
1403 | ||
1404 | int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 block_group, | |
1405 | struct ext4_group_desc *gdp) | |
1406 | { | |
1407 | if ((sbi->s_es->s_feature_ro_compat & | |
1408 | cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) && | |
1409 | (gdp->bg_checksum != ext4_group_desc_csum(sbi, block_group, gdp))) | |
1410 | return 0; | |
1411 | ||
1412 | return 1; | |
1413 | } | |
1414 | ||
ac27a0ec | 1415 | /* Called at mount-time, super-block is locked */ |
617ba13b | 1416 | static int ext4_check_descriptors (struct super_block * sb) |
ac27a0ec | 1417 | { |
617ba13b MC |
1418 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
1419 | ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block); | |
1420 | ext4_fsblk_t last_block; | |
bd81d8ee LV |
1421 | ext4_fsblk_t block_bitmap; |
1422 | ext4_fsblk_t inode_bitmap; | |
1423 | ext4_fsblk_t inode_table; | |
617ba13b | 1424 | struct ext4_group_desc * gdp = NULL; |
ac27a0ec | 1425 | int desc_block = 0; |
ce421581 | 1426 | int flexbg_flag = 0; |
fd2d4291 | 1427 | ext4_group_t i; |
ac27a0ec | 1428 | |
ce421581 JS |
1429 | if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG)) |
1430 | flexbg_flag = 1; | |
1431 | ||
617ba13b | 1432 | ext4_debug ("Checking group descriptors"); |
ac27a0ec DK |
1433 | |
1434 | for (i = 0; i < sbi->s_groups_count; i++) | |
1435 | { | |
ce421581 | 1436 | if (i == sbi->s_groups_count - 1 || flexbg_flag) |
bd81d8ee | 1437 | last_block = ext4_blocks_count(sbi->s_es) - 1; |
ac27a0ec DK |
1438 | else |
1439 | last_block = first_block + | |
617ba13b | 1440 | (EXT4_BLOCKS_PER_GROUP(sb) - 1); |
ac27a0ec | 1441 | |
617ba13b MC |
1442 | if ((i % EXT4_DESC_PER_BLOCK(sb)) == 0) |
1443 | gdp = (struct ext4_group_desc *) | |
ac27a0ec | 1444 | sbi->s_group_desc[desc_block++]->b_data; |
8fadc143 | 1445 | block_bitmap = ext4_block_bitmap(sb, gdp); |
bd81d8ee | 1446 | if (block_bitmap < first_block || block_bitmap > last_block) |
ac27a0ec | 1447 | { |
617ba13b | 1448 | ext4_error (sb, "ext4_check_descriptors", |
fd2d4291 | 1449 | "Block bitmap for group %lu" |
2ae02107 | 1450 | " not in group (block %llu)!", |
bd81d8ee | 1451 | i, block_bitmap); |
ac27a0ec DK |
1452 | return 0; |
1453 | } | |
8fadc143 | 1454 | inode_bitmap = ext4_inode_bitmap(sb, gdp); |
bd81d8ee | 1455 | if (inode_bitmap < first_block || inode_bitmap > last_block) |
ac27a0ec | 1456 | { |
617ba13b | 1457 | ext4_error (sb, "ext4_check_descriptors", |
fd2d4291 | 1458 | "Inode bitmap for group %lu" |
2ae02107 | 1459 | " not in group (block %llu)!", |
bd81d8ee | 1460 | i, inode_bitmap); |
ac27a0ec DK |
1461 | return 0; |
1462 | } | |
8fadc143 | 1463 | inode_table = ext4_inode_table(sb, gdp); |
bd81d8ee | 1464 | if (inode_table < first_block || |
780dcdb2 | 1465 | inode_table + sbi->s_itb_per_group - 1 > last_block) |
ac27a0ec | 1466 | { |
617ba13b | 1467 | ext4_error (sb, "ext4_check_descriptors", |
fd2d4291 | 1468 | "Inode table for group %lu" |
2ae02107 | 1469 | " not in group (block %llu)!", |
bd81d8ee | 1470 | i, inode_table); |
ac27a0ec DK |
1471 | return 0; |
1472 | } | |
717d50e4 AD |
1473 | if (!ext4_group_desc_csum_verify(sbi, i, gdp)) { |
1474 | ext4_error(sb, __FUNCTION__, | |
fd2d4291 AM |
1475 | "Checksum for group %lu failed (%u!=%u)\n", |
1476 | i, le16_to_cpu(ext4_group_desc_csum(sbi, i, | |
1477 | gdp)), le16_to_cpu(gdp->bg_checksum)); | |
717d50e4 AD |
1478 | return 0; |
1479 | } | |
ce421581 JS |
1480 | if (!flexbg_flag) |
1481 | first_block += EXT4_BLOCKS_PER_GROUP(sb); | |
0d1ee42f AR |
1482 | gdp = (struct ext4_group_desc *) |
1483 | ((__u8 *)gdp + EXT4_DESC_SIZE(sb)); | |
ac27a0ec DK |
1484 | } |
1485 | ||
bd81d8ee | 1486 | ext4_free_blocks_count_set(sbi->s_es, ext4_count_free_blocks(sb)); |
617ba13b | 1487 | sbi->s_es->s_free_inodes_count=cpu_to_le32(ext4_count_free_inodes(sb)); |
ac27a0ec DK |
1488 | return 1; |
1489 | } | |
1490 | ||
617ba13b | 1491 | /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at |
ac27a0ec DK |
1492 | * the superblock) which were deleted from all directories, but held open by |
1493 | * a process at the time of a crash. We walk the list and try to delete these | |
1494 | * inodes at recovery time (only with a read-write filesystem). | |
1495 | * | |
1496 | * In order to keep the orphan inode chain consistent during traversal (in | |
1497 | * case of crash during recovery), we link each inode into the superblock | |
1498 | * orphan list_head and handle it the same way as an inode deletion during | |
1499 | * normal operation (which journals the operations for us). | |
1500 | * | |
1501 | * We only do an iget() and an iput() on each inode, which is very safe if we | |
1502 | * accidentally point at an in-use or already deleted inode. The worst that | |
1503 | * can happen in this case is that we get a "bit already cleared" message from | |
617ba13b | 1504 | * ext4_free_inode(). The only reason we would point at a wrong inode is if |
ac27a0ec DK |
1505 | * e2fsck was run on this filesystem, and it must have already done the orphan |
1506 | * inode cleanup for us, so we can safely abort without any further action. | |
1507 | */ | |
617ba13b MC |
1508 | static void ext4_orphan_cleanup (struct super_block * sb, |
1509 | struct ext4_super_block * es) | |
ac27a0ec DK |
1510 | { |
1511 | unsigned int s_flags = sb->s_flags; | |
1512 | int nr_orphans = 0, nr_truncates = 0; | |
1513 | #ifdef CONFIG_QUOTA | |
1514 | int i; | |
1515 | #endif | |
1516 | if (!es->s_last_orphan) { | |
1517 | jbd_debug(4, "no orphan inodes to clean up\n"); | |
1518 | return; | |
1519 | } | |
1520 | ||
a8f48a95 ES |
1521 | if (bdev_read_only(sb->s_bdev)) { |
1522 | printk(KERN_ERR "EXT4-fs: write access " | |
1523 | "unavailable, skipping orphan cleanup.\n"); | |
1524 | return; | |
1525 | } | |
1526 | ||
617ba13b | 1527 | if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) { |
ac27a0ec DK |
1528 | if (es->s_last_orphan) |
1529 | jbd_debug(1, "Errors on filesystem, " | |
1530 | "clearing orphan list.\n"); | |
1531 | es->s_last_orphan = 0; | |
1532 | jbd_debug(1, "Skipping orphan recovery on fs with errors.\n"); | |
1533 | return; | |
1534 | } | |
1535 | ||
1536 | if (s_flags & MS_RDONLY) { | |
617ba13b | 1537 | printk(KERN_INFO "EXT4-fs: %s: orphan cleanup on readonly fs\n", |
ac27a0ec DK |
1538 | sb->s_id); |
1539 | sb->s_flags &= ~MS_RDONLY; | |
1540 | } | |
1541 | #ifdef CONFIG_QUOTA | |
1542 | /* Needed for iput() to work correctly and not trash data */ | |
1543 | sb->s_flags |= MS_ACTIVE; | |
1544 | /* Turn on quotas so that they are updated correctly */ | |
1545 | for (i = 0; i < MAXQUOTAS; i++) { | |
617ba13b MC |
1546 | if (EXT4_SB(sb)->s_qf_names[i]) { |
1547 | int ret = ext4_quota_on_mount(sb, i); | |
ac27a0ec DK |
1548 | if (ret < 0) |
1549 | printk(KERN_ERR | |
617ba13b | 1550 | "EXT4-fs: Cannot turn on journalled " |
ac27a0ec DK |
1551 | "quota: error %d\n", ret); |
1552 | } | |
1553 | } | |
1554 | #endif | |
1555 | ||
1556 | while (es->s_last_orphan) { | |
1557 | struct inode *inode; | |
1558 | ||
1559 | if (!(inode = | |
617ba13b | 1560 | ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan)))) { |
ac27a0ec DK |
1561 | es->s_last_orphan = 0; |
1562 | break; | |
1563 | } | |
1564 | ||
617ba13b | 1565 | list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan); |
ac27a0ec DK |
1566 | DQUOT_INIT(inode); |
1567 | if (inode->i_nlink) { | |
1568 | printk(KERN_DEBUG | |
1569 | "%s: truncating inode %lu to %Ld bytes\n", | |
1570 | __FUNCTION__, inode->i_ino, inode->i_size); | |
1571 | jbd_debug(2, "truncating inode %lu to %Ld bytes\n", | |
1572 | inode->i_ino, inode->i_size); | |
617ba13b | 1573 | ext4_truncate(inode); |
ac27a0ec DK |
1574 | nr_truncates++; |
1575 | } else { | |
1576 | printk(KERN_DEBUG | |
1577 | "%s: deleting unreferenced inode %lu\n", | |
1578 | __FUNCTION__, inode->i_ino); | |
1579 | jbd_debug(2, "deleting unreferenced inode %lu\n", | |
1580 | inode->i_ino); | |
1581 | nr_orphans++; | |
1582 | } | |
1583 | iput(inode); /* The delete magic happens here! */ | |
1584 | } | |
1585 | ||
1586 | #define PLURAL(x) (x), ((x)==1) ? "" : "s" | |
1587 | ||
1588 | if (nr_orphans) | |
617ba13b | 1589 | printk(KERN_INFO "EXT4-fs: %s: %d orphan inode%s deleted\n", |
ac27a0ec DK |
1590 | sb->s_id, PLURAL(nr_orphans)); |
1591 | if (nr_truncates) | |
617ba13b | 1592 | printk(KERN_INFO "EXT4-fs: %s: %d truncate%s cleaned up\n", |
ac27a0ec DK |
1593 | sb->s_id, PLURAL(nr_truncates)); |
1594 | #ifdef CONFIG_QUOTA | |
1595 | /* Turn quotas off */ | |
1596 | for (i = 0; i < MAXQUOTAS; i++) { | |
1597 | if (sb_dqopt(sb)->files[i]) | |
1598 | vfs_quota_off(sb, i); | |
1599 | } | |
1600 | #endif | |
1601 | sb->s_flags = s_flags; /* Restore MS_RDONLY status */ | |
1602 | } | |
cd2291a4 ES |
1603 | /* |
1604 | * Maximal extent format file size. | |
1605 | * Resulting logical blkno at s_maxbytes must fit in our on-disk | |
1606 | * extent format containers, within a sector_t, and within i_blocks | |
1607 | * in the vfs. ext4 inode has 48 bits of i_block in fsblock units, | |
1608 | * so that won't be a limiting factor. | |
1609 | * | |
1610 | * Note, this does *not* consider any metadata overhead for vfs i_blocks. | |
1611 | */ | |
1612 | static loff_t ext4_max_size(int blkbits) | |
1613 | { | |
1614 | loff_t res; | |
1615 | loff_t upper_limit = MAX_LFS_FILESIZE; | |
1616 | ||
1617 | /* small i_blocks in vfs inode? */ | |
1618 | if (sizeof(blkcnt_t) < sizeof(u64)) { | |
1619 | /* | |
1620 | * CONFIG_LSF is not enabled implies the inode | |
1621 | * i_block represent total blocks in 512 bytes | |
1622 | * 32 == size of vfs inode i_blocks * 8 | |
1623 | */ | |
1624 | upper_limit = (1LL << 32) - 1; | |
1625 | ||
1626 | /* total blocks in file system block size */ | |
1627 | upper_limit >>= (blkbits - 9); | |
1628 | upper_limit <<= blkbits; | |
1629 | } | |
1630 | ||
1631 | /* 32-bit extent-start container, ee_block */ | |
1632 | res = 1LL << 32; | |
1633 | res <<= blkbits; | |
1634 | res -= 1; | |
1635 | ||
1636 | /* Sanity check against vm- & vfs- imposed limits */ | |
1637 | if (res > upper_limit) | |
1638 | res = upper_limit; | |
1639 | ||
1640 | return res; | |
1641 | } | |
ac27a0ec | 1642 | |
ac27a0ec | 1643 | /* |
cd2291a4 | 1644 | * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect |
0fc1b451 AK |
1645 | * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks. |
1646 | * We need to be 1 filesystem block less than the 2^48 sector limit. | |
ac27a0ec | 1647 | */ |
cd2291a4 | 1648 | static loff_t ext4_max_bitmap_size(int bits) |
ac27a0ec | 1649 | { |
617ba13b | 1650 | loff_t res = EXT4_NDIR_BLOCKS; |
0fc1b451 AK |
1651 | int meta_blocks; |
1652 | loff_t upper_limit; | |
1653 | /* This is calculated to be the largest file size for a | |
cd2291a4 | 1654 | * dense, bitmapped file such that the total number of |
ac27a0ec | 1655 | * sectors in the file, including data and all indirect blocks, |
0fc1b451 AK |
1656 | * does not exceed 2^48 -1 |
1657 | * __u32 i_blocks_lo and _u16 i_blocks_high representing the | |
1658 | * total number of 512 bytes blocks of the file | |
1659 | */ | |
1660 | ||
1661 | if (sizeof(blkcnt_t) < sizeof(u64)) { | |
1662 | /* | |
1663 | * CONFIG_LSF is not enabled implies the inode | |
1664 | * i_block represent total blocks in 512 bytes | |
1665 | * 32 == size of vfs inode i_blocks * 8 | |
1666 | */ | |
1667 | upper_limit = (1LL << 32) - 1; | |
1668 | ||
1669 | /* total blocks in file system block size */ | |
1670 | upper_limit >>= (bits - 9); | |
1671 | ||
1672 | } else { | |
8180a562 AK |
1673 | /* |
1674 | * We use 48 bit ext4_inode i_blocks | |
1675 | * With EXT4_HUGE_FILE_FL set the i_blocks | |
1676 | * represent total number of blocks in | |
1677 | * file system block size | |
1678 | */ | |
0fc1b451 AK |
1679 | upper_limit = (1LL << 48) - 1; |
1680 | ||
0fc1b451 AK |
1681 | } |
1682 | ||
1683 | /* indirect blocks */ | |
1684 | meta_blocks = 1; | |
1685 | /* double indirect blocks */ | |
1686 | meta_blocks += 1 + (1LL << (bits-2)); | |
1687 | /* tripple indirect blocks */ | |
1688 | meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2))); | |
1689 | ||
1690 | upper_limit -= meta_blocks; | |
1691 | upper_limit <<= bits; | |
ac27a0ec DK |
1692 | |
1693 | res += 1LL << (bits-2); | |
1694 | res += 1LL << (2*(bits-2)); | |
1695 | res += 1LL << (3*(bits-2)); | |
1696 | res <<= bits; | |
1697 | if (res > upper_limit) | |
1698 | res = upper_limit; | |
0fc1b451 AK |
1699 | |
1700 | if (res > MAX_LFS_FILESIZE) | |
1701 | res = MAX_LFS_FILESIZE; | |
1702 | ||
ac27a0ec DK |
1703 | return res; |
1704 | } | |
1705 | ||
617ba13b | 1706 | static ext4_fsblk_t descriptor_loc(struct super_block *sb, |
70bbb3e0 | 1707 | ext4_fsblk_t logical_sb_block, int nr) |
ac27a0ec | 1708 | { |
617ba13b | 1709 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
fd2d4291 | 1710 | ext4_group_t bg, first_meta_bg; |
ac27a0ec DK |
1711 | int has_super = 0; |
1712 | ||
1713 | first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg); | |
1714 | ||
617ba13b | 1715 | if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) || |
ac27a0ec | 1716 | nr < first_meta_bg) |
70bbb3e0 | 1717 | return logical_sb_block + nr + 1; |
ac27a0ec | 1718 | bg = sbi->s_desc_per_block * nr; |
617ba13b | 1719 | if (ext4_bg_has_super(sb, bg)) |
ac27a0ec | 1720 | has_super = 1; |
617ba13b | 1721 | return (has_super + ext4_group_first_block_no(sb, bg)); |
ac27a0ec DK |
1722 | } |
1723 | ||
1724 | ||
617ba13b | 1725 | static int ext4_fill_super (struct super_block *sb, void *data, int silent) |
1d03ec98 AK |
1726 | __releases(kernel_sem) |
1727 | __acquires(kernel_sem) | |
1728 | ||
ac27a0ec DK |
1729 | { |
1730 | struct buffer_head * bh; | |
617ba13b MC |
1731 | struct ext4_super_block *es = NULL; |
1732 | struct ext4_sb_info *sbi; | |
1733 | ext4_fsblk_t block; | |
1734 | ext4_fsblk_t sb_block = get_sb_block(&data); | |
70bbb3e0 | 1735 | ext4_fsblk_t logical_sb_block; |
ac27a0ec DK |
1736 | unsigned long offset = 0; |
1737 | unsigned int journal_inum = 0; | |
1738 | unsigned long journal_devnum = 0; | |
1739 | unsigned long def_mount_opts; | |
1740 | struct inode *root; | |
1741 | int blocksize; | |
1742 | int hblock; | |
1743 | int db_count; | |
1744 | int i; | |
1745 | int needs_recovery; | |
1746 | __le32 features; | |
bd81d8ee | 1747 | __u64 blocks_count; |
833f4077 | 1748 | int err; |
ac27a0ec DK |
1749 | |
1750 | sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); | |
1751 | if (!sbi) | |
1752 | return -ENOMEM; | |
1753 | sb->s_fs_info = sbi; | |
1754 | sbi->s_mount_opt = 0; | |
617ba13b MC |
1755 | sbi->s_resuid = EXT4_DEF_RESUID; |
1756 | sbi->s_resgid = EXT4_DEF_RESGID; | |
d9c9bef1 | 1757 | sbi->s_sb_block = sb_block; |
ac27a0ec DK |
1758 | |
1759 | unlock_kernel(); | |
1760 | ||
617ba13b | 1761 | blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE); |
ac27a0ec | 1762 | if (!blocksize) { |
617ba13b | 1763 | printk(KERN_ERR "EXT4-fs: unable to set blocksize\n"); |
ac27a0ec DK |
1764 | goto out_fail; |
1765 | } | |
1766 | ||
afc7cbca TS |
1767 | if (!sb_set_blocksize(sb, blocksize)) { |
1768 | printk(KERN_ERR "EXT4-fs: bad blocksize %d.\n", blocksize); | |
1769 | goto out_fail; | |
1770 | } | |
1771 | ||
ac27a0ec | 1772 | /* |
617ba13b | 1773 | * The ext4 superblock will not be buffer aligned for other than 1kB |
ac27a0ec DK |
1774 | * block sizes. We need to calculate the offset from buffer start. |
1775 | */ | |
617ba13b | 1776 | if (blocksize != EXT4_MIN_BLOCK_SIZE) { |
70bbb3e0 AM |
1777 | logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE; |
1778 | offset = do_div(logical_sb_block, blocksize); | |
ac27a0ec | 1779 | } else { |
70bbb3e0 | 1780 | logical_sb_block = sb_block; |
ac27a0ec DK |
1781 | } |
1782 | ||
70bbb3e0 | 1783 | if (!(bh = sb_bread(sb, logical_sb_block))) { |
617ba13b | 1784 | printk (KERN_ERR "EXT4-fs: unable to read superblock\n"); |
ac27a0ec DK |
1785 | goto out_fail; |
1786 | } | |
1787 | /* | |
1788 | * Note: s_es must be initialized as soon as possible because | |
617ba13b | 1789 | * some ext4 macro-instructions depend on its value |
ac27a0ec | 1790 | */ |
617ba13b | 1791 | es = (struct ext4_super_block *) (((char *)bh->b_data) + offset); |
ac27a0ec DK |
1792 | sbi->s_es = es; |
1793 | sb->s_magic = le16_to_cpu(es->s_magic); | |
617ba13b MC |
1794 | if (sb->s_magic != EXT4_SUPER_MAGIC) |
1795 | goto cantfind_ext4; | |
ac27a0ec DK |
1796 | |
1797 | /* Set defaults before we parse the mount options */ | |
1798 | def_mount_opts = le32_to_cpu(es->s_default_mount_opts); | |
617ba13b | 1799 | if (def_mount_opts & EXT4_DEFM_DEBUG) |
ac27a0ec | 1800 | set_opt(sbi->s_mount_opt, DEBUG); |
617ba13b | 1801 | if (def_mount_opts & EXT4_DEFM_BSDGROUPS) |
ac27a0ec | 1802 | set_opt(sbi->s_mount_opt, GRPID); |
617ba13b | 1803 | if (def_mount_opts & EXT4_DEFM_UID16) |
ac27a0ec | 1804 | set_opt(sbi->s_mount_opt, NO_UID32); |
2e7842b8 | 1805 | #ifdef CONFIG_EXT4DEV_FS_XATTR |
617ba13b | 1806 | if (def_mount_opts & EXT4_DEFM_XATTR_USER) |
ac27a0ec | 1807 | set_opt(sbi->s_mount_opt, XATTR_USER); |
2e7842b8 HD |
1808 | #endif |
1809 | #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL | |
617ba13b | 1810 | if (def_mount_opts & EXT4_DEFM_ACL) |
ac27a0ec | 1811 | set_opt(sbi->s_mount_opt, POSIX_ACL); |
2e7842b8 | 1812 | #endif |
617ba13b MC |
1813 | if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA) |
1814 | sbi->s_mount_opt |= EXT4_MOUNT_JOURNAL_DATA; | |
1815 | else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED) | |
1816 | sbi->s_mount_opt |= EXT4_MOUNT_ORDERED_DATA; | |
1817 | else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK) | |
1818 | sbi->s_mount_opt |= EXT4_MOUNT_WRITEBACK_DATA; | |
1819 | ||
1820 | if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC) | |
ac27a0ec | 1821 | set_opt(sbi->s_mount_opt, ERRORS_PANIC); |
bb4f397a | 1822 | else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE) |
ceea16bf | 1823 | set_opt(sbi->s_mount_opt, ERRORS_CONT); |
bb4f397a AK |
1824 | else |
1825 | set_opt(sbi->s_mount_opt, ERRORS_RO); | |
ac27a0ec DK |
1826 | |
1827 | sbi->s_resuid = le16_to_cpu(es->s_def_resuid); | |
1828 | sbi->s_resgid = le16_to_cpu(es->s_def_resgid); | |
1829 | ||
1830 | set_opt(sbi->s_mount_opt, RESERVATION); | |
1831 | ||
1e2462f9 MC |
1832 | /* |
1833 | * turn on extents feature by default in ext4 filesystem | |
1834 | * User -o noextents to turn it off | |
1835 | */ | |
1836 | set_opt(sbi->s_mount_opt, EXTENTS); | |
1837 | ||
ac27a0ec DK |
1838 | if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum, |
1839 | NULL, 0)) | |
1840 | goto failed_mount; | |
1841 | ||
1842 | sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | | |
617ba13b | 1843 | ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0); |
ac27a0ec | 1844 | |
617ba13b MC |
1845 | if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV && |
1846 | (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) || | |
1847 | EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) || | |
1848 | EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U))) | |
ac27a0ec | 1849 | printk(KERN_WARNING |
617ba13b | 1850 | "EXT4-fs warning: feature flags set on rev 0 fs, " |
ac27a0ec DK |
1851 | "running e2fsck is recommended\n"); |
1852 | /* | |
1853 | * Check feature flags regardless of the revision level, since we | |
1854 | * previously didn't change the revision level when setting the flags, | |
1855 | * so there is a chance incompat flags are set on a rev 0 filesystem. | |
1856 | */ | |
617ba13b | 1857 | features = EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP); |
ac27a0ec | 1858 | if (features) { |
617ba13b | 1859 | printk(KERN_ERR "EXT4-fs: %s: couldn't mount because of " |
ac27a0ec DK |
1860 | "unsupported optional features (%x).\n", |
1861 | sb->s_id, le32_to_cpu(features)); | |
1862 | goto failed_mount; | |
1863 | } | |
617ba13b | 1864 | features = EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP); |
ac27a0ec | 1865 | if (!(sb->s_flags & MS_RDONLY) && features) { |
617ba13b | 1866 | printk(KERN_ERR "EXT4-fs: %s: couldn't mount RDWR because of " |
ac27a0ec DK |
1867 | "unsupported optional features (%x).\n", |
1868 | sb->s_id, le32_to_cpu(features)); | |
1869 | goto failed_mount; | |
1870 | } | |
0fc1b451 AK |
1871 | if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) { |
1872 | /* | |
1873 | * Large file size enabled file system can only be | |
1874 | * mount if kernel is build with CONFIG_LSF | |
1875 | */ | |
1876 | if (sizeof(root->i_blocks) < sizeof(u64) && | |
1877 | !(sb->s_flags & MS_RDONLY)) { | |
1878 | printk(KERN_ERR "EXT4-fs: %s: Filesystem with huge " | |
1879 | "files cannot be mounted read-write " | |
1880 | "without CONFIG_LSF.\n", sb->s_id); | |
1881 | goto failed_mount; | |
1882 | } | |
1883 | } | |
ac27a0ec DK |
1884 | blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size); |
1885 | ||
617ba13b MC |
1886 | if (blocksize < EXT4_MIN_BLOCK_SIZE || |
1887 | blocksize > EXT4_MAX_BLOCK_SIZE) { | |
ac27a0ec | 1888 | printk(KERN_ERR |
617ba13b | 1889 | "EXT4-fs: Unsupported filesystem blocksize %d on %s.\n", |
ac27a0ec DK |
1890 | blocksize, sb->s_id); |
1891 | goto failed_mount; | |
1892 | } | |
1893 | ||
1894 | hblock = bdev_hardsect_size(sb->s_bdev); | |
1895 | if (sb->s_blocksize != blocksize) { | |
1896 | /* | |
1897 | * Make sure the blocksize for the filesystem is larger | |
1898 | * than the hardware sectorsize for the machine. | |
1899 | */ | |
1900 | if (blocksize < hblock) { | |
617ba13b | 1901 | printk(KERN_ERR "EXT4-fs: blocksize %d too small for " |
ac27a0ec DK |
1902 | "device blocksize %d.\n", blocksize, hblock); |
1903 | goto failed_mount; | |
1904 | } | |
1905 | ||
1906 | brelse (bh); | |
1907 | sb_set_blocksize(sb, blocksize); | |
70bbb3e0 AM |
1908 | logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE; |
1909 | offset = do_div(logical_sb_block, blocksize); | |
1910 | bh = sb_bread(sb, logical_sb_block); | |
ac27a0ec DK |
1911 | if (!bh) { |
1912 | printk(KERN_ERR | |
617ba13b | 1913 | "EXT4-fs: Can't read superblock on 2nd try.\n"); |
ac27a0ec DK |
1914 | goto failed_mount; |
1915 | } | |
617ba13b | 1916 | es = (struct ext4_super_block *)(((char *)bh->b_data) + offset); |
ac27a0ec | 1917 | sbi->s_es = es; |
617ba13b | 1918 | if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) { |
ac27a0ec | 1919 | printk (KERN_ERR |
617ba13b | 1920 | "EXT4-fs: Magic mismatch, very weird !\n"); |
ac27a0ec DK |
1921 | goto failed_mount; |
1922 | } | |
1923 | } | |
1924 | ||
e2b46574 | 1925 | sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits); |
617ba13b | 1926 | sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits); |
ac27a0ec | 1927 | |
617ba13b MC |
1928 | if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) { |
1929 | sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE; | |
1930 | sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO; | |
ac27a0ec DK |
1931 | } else { |
1932 | sbi->s_inode_size = le16_to_cpu(es->s_inode_size); | |
1933 | sbi->s_first_ino = le32_to_cpu(es->s_first_ino); | |
617ba13b | 1934 | if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) || |
1330593e | 1935 | (!is_power_of_2(sbi->s_inode_size)) || |
ac27a0ec DK |
1936 | (sbi->s_inode_size > blocksize)) { |
1937 | printk (KERN_ERR | |
617ba13b | 1938 | "EXT4-fs: unsupported inode size: %d\n", |
ac27a0ec DK |
1939 | sbi->s_inode_size); |
1940 | goto failed_mount; | |
1941 | } | |
ef7f3835 KS |
1942 | if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) |
1943 | sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2); | |
ac27a0ec | 1944 | } |
0d1ee42f AR |
1945 | sbi->s_desc_size = le16_to_cpu(es->s_desc_size); |
1946 | if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) { | |
8fadc143 | 1947 | if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT || |
0d1ee42f | 1948 | sbi->s_desc_size > EXT4_MAX_DESC_SIZE || |
d8ea6cf8 | 1949 | !is_power_of_2(sbi->s_desc_size)) { |
0d1ee42f | 1950 | printk(KERN_ERR |
8fadc143 | 1951 | "EXT4-fs: unsupported descriptor size %lu\n", |
0d1ee42f AR |
1952 | sbi->s_desc_size); |
1953 | goto failed_mount; | |
1954 | } | |
1955 | } else | |
1956 | sbi->s_desc_size = EXT4_MIN_DESC_SIZE; | |
ac27a0ec | 1957 | sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group); |
ac27a0ec | 1958 | sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group); |
b47b6f38 | 1959 | if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0) |
617ba13b MC |
1960 | goto cantfind_ext4; |
1961 | sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb); | |
ac27a0ec | 1962 | if (sbi->s_inodes_per_block == 0) |
617ba13b | 1963 | goto cantfind_ext4; |
ac27a0ec DK |
1964 | sbi->s_itb_per_group = sbi->s_inodes_per_group / |
1965 | sbi->s_inodes_per_block; | |
0d1ee42f | 1966 | sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb); |
ac27a0ec DK |
1967 | sbi->s_sbh = bh; |
1968 | sbi->s_mount_state = le16_to_cpu(es->s_state); | |
e57aa839 FW |
1969 | sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb)); |
1970 | sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb)); | |
ac27a0ec DK |
1971 | for (i=0; i < 4; i++) |
1972 | sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]); | |
1973 | sbi->s_def_hash_version = es->s_def_hash_version; | |
1974 | ||
1975 | if (sbi->s_blocks_per_group > blocksize * 8) { | |
1976 | printk (KERN_ERR | |
617ba13b | 1977 | "EXT4-fs: #blocks per group too big: %lu\n", |
ac27a0ec DK |
1978 | sbi->s_blocks_per_group); |
1979 | goto failed_mount; | |
1980 | } | |
ac27a0ec DK |
1981 | if (sbi->s_inodes_per_group > blocksize * 8) { |
1982 | printk (KERN_ERR | |
617ba13b | 1983 | "EXT4-fs: #inodes per group too big: %lu\n", |
ac27a0ec DK |
1984 | sbi->s_inodes_per_group); |
1985 | goto failed_mount; | |
1986 | } | |
1987 | ||
bd81d8ee | 1988 | if (ext4_blocks_count(es) > |
ac27a0ec | 1989 | (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) { |
617ba13b | 1990 | printk(KERN_ERR "EXT4-fs: filesystem on %s:" |
ac27a0ec DK |
1991 | " too large to mount safely\n", sb->s_id); |
1992 | if (sizeof(sector_t) < 8) | |
617ba13b | 1993 | printk(KERN_WARNING "EXT4-fs: CONFIG_LBD not " |
ac27a0ec DK |
1994 | "enabled\n"); |
1995 | goto failed_mount; | |
1996 | } | |
1997 | ||
617ba13b MC |
1998 | if (EXT4_BLOCKS_PER_GROUP(sb) == 0) |
1999 | goto cantfind_ext4; | |
e7c95593 ES |
2000 | |
2001 | /* ensure blocks_count calculation below doesn't sign-extend */ | |
2002 | if (ext4_blocks_count(es) + EXT4_BLOCKS_PER_GROUP(sb) < | |
2003 | le32_to_cpu(es->s_first_data_block) + 1) { | |
2004 | printk(KERN_WARNING "EXT4-fs: bad geometry: block count %llu, " | |
2005 | "first data block %u, blocks per group %lu\n", | |
2006 | ext4_blocks_count(es), | |
2007 | le32_to_cpu(es->s_first_data_block), | |
2008 | EXT4_BLOCKS_PER_GROUP(sb)); | |
2009 | goto failed_mount; | |
2010 | } | |
bd81d8ee LV |
2011 | blocks_count = (ext4_blocks_count(es) - |
2012 | le32_to_cpu(es->s_first_data_block) + | |
2013 | EXT4_BLOCKS_PER_GROUP(sb) - 1); | |
2014 | do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb)); | |
2015 | sbi->s_groups_count = blocks_count; | |
617ba13b MC |
2016 | db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) / |
2017 | EXT4_DESC_PER_BLOCK(sb); | |
ac27a0ec DK |
2018 | sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *), |
2019 | GFP_KERNEL); | |
2020 | if (sbi->s_group_desc == NULL) { | |
617ba13b | 2021 | printk (KERN_ERR "EXT4-fs: not enough memory\n"); |
ac27a0ec DK |
2022 | goto failed_mount; |
2023 | } | |
2024 | ||
2025 | bgl_lock_init(&sbi->s_blockgroup_lock); | |
2026 | ||
2027 | for (i = 0; i < db_count; i++) { | |
70bbb3e0 | 2028 | block = descriptor_loc(sb, logical_sb_block, i); |
ac27a0ec DK |
2029 | sbi->s_group_desc[i] = sb_bread(sb, block); |
2030 | if (!sbi->s_group_desc[i]) { | |
617ba13b | 2031 | printk (KERN_ERR "EXT4-fs: " |
ac27a0ec DK |
2032 | "can't read group descriptor %d\n", i); |
2033 | db_count = i; | |
2034 | goto failed_mount2; | |
2035 | } | |
2036 | } | |
617ba13b MC |
2037 | if (!ext4_check_descriptors (sb)) { |
2038 | printk(KERN_ERR "EXT4-fs: group descriptors corrupted!\n"); | |
ac27a0ec DK |
2039 | goto failed_mount2; |
2040 | } | |
2041 | sbi->s_gdb_count = db_count; | |
2042 | get_random_bytes(&sbi->s_next_generation, sizeof(u32)); | |
2043 | spin_lock_init(&sbi->s_next_gen_lock); | |
2044 | ||
833f4077 PZ |
2045 | err = percpu_counter_init(&sbi->s_freeblocks_counter, |
2046 | ext4_count_free_blocks(sb)); | |
2047 | if (!err) { | |
2048 | err = percpu_counter_init(&sbi->s_freeinodes_counter, | |
2049 | ext4_count_free_inodes(sb)); | |
2050 | } | |
2051 | if (!err) { | |
2052 | err = percpu_counter_init(&sbi->s_dirs_counter, | |
2053 | ext4_count_dirs(sb)); | |
2054 | } | |
2055 | if (err) { | |
2056 | printk(KERN_ERR "EXT4-fs: insufficient memory\n"); | |
2057 | goto failed_mount3; | |
2058 | } | |
ac27a0ec DK |
2059 | |
2060 | /* per fileystem reservation list head & lock */ | |
2061 | spin_lock_init(&sbi->s_rsv_window_lock); | |
2062 | sbi->s_rsv_window_root = RB_ROOT; | |
2063 | /* Add a single, static dummy reservation to the start of the | |
2064 | * reservation window list --- it gives us a placeholder for | |
2065 | * append-at-start-of-list which makes the allocation logic | |
2066 | * _much_ simpler. */ | |
617ba13b MC |
2067 | sbi->s_rsv_window_head.rsv_start = EXT4_RESERVE_WINDOW_NOT_ALLOCATED; |
2068 | sbi->s_rsv_window_head.rsv_end = EXT4_RESERVE_WINDOW_NOT_ALLOCATED; | |
ac27a0ec DK |
2069 | sbi->s_rsv_window_head.rsv_alloc_hit = 0; |
2070 | sbi->s_rsv_window_head.rsv_goal_size = 0; | |
617ba13b | 2071 | ext4_rsv_window_add(sb, &sbi->s_rsv_window_head); |
ac27a0ec DK |
2072 | |
2073 | /* | |
2074 | * set up enough so that it can read an inode | |
2075 | */ | |
617ba13b MC |
2076 | sb->s_op = &ext4_sops; |
2077 | sb->s_export_op = &ext4_export_ops; | |
2078 | sb->s_xattr = ext4_xattr_handlers; | |
ac27a0ec | 2079 | #ifdef CONFIG_QUOTA |
617ba13b MC |
2080 | sb->s_qcop = &ext4_qctl_operations; |
2081 | sb->dq_op = &ext4_quota_operations; | |
ac27a0ec DK |
2082 | #endif |
2083 | INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */ | |
2084 | ||
2085 | sb->s_root = NULL; | |
2086 | ||
2087 | needs_recovery = (es->s_last_orphan != 0 || | |
617ba13b MC |
2088 | EXT4_HAS_INCOMPAT_FEATURE(sb, |
2089 | EXT4_FEATURE_INCOMPAT_RECOVER)); | |
ac27a0ec DK |
2090 | |
2091 | /* | |
2092 | * The first inode we look at is the journal inode. Don't try | |
2093 | * root first: it may be modified in the journal! | |
2094 | */ | |
2095 | if (!test_opt(sb, NOLOAD) && | |
617ba13b MC |
2096 | EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) { |
2097 | if (ext4_load_journal(sb, es, journal_devnum)) | |
ac27a0ec DK |
2098 | goto failed_mount3; |
2099 | } else if (journal_inum) { | |
617ba13b | 2100 | if (ext4_create_journal(sb, es, journal_inum)) |
ac27a0ec DK |
2101 | goto failed_mount3; |
2102 | } else { | |
2103 | if (!silent) | |
2104 | printk (KERN_ERR | |
617ba13b | 2105 | "ext4: No journal on filesystem on %s\n", |
ac27a0ec DK |
2106 | sb->s_id); |
2107 | goto failed_mount3; | |
2108 | } | |
2109 | ||
eb40a09c JS |
2110 | if (ext4_blocks_count(es) > 0xffffffffULL && |
2111 | !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0, | |
2112 | JBD2_FEATURE_INCOMPAT_64BIT)) { | |
2113 | printk(KERN_ERR "ext4: Failed to set 64-bit journal feature\n"); | |
2114 | goto failed_mount4; | |
2115 | } | |
2116 | ||
ac27a0ec DK |
2117 | /* We have now updated the journal if required, so we can |
2118 | * validate the data journaling mode. */ | |
2119 | switch (test_opt(sb, DATA_FLAGS)) { | |
2120 | case 0: | |
2121 | /* No mode set, assume a default based on the journal | |
63f57933 AM |
2122 | * capabilities: ORDERED_DATA if the journal can |
2123 | * cope, else JOURNAL_DATA | |
2124 | */ | |
dab291af MC |
2125 | if (jbd2_journal_check_available_features |
2126 | (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) | |
ac27a0ec DK |
2127 | set_opt(sbi->s_mount_opt, ORDERED_DATA); |
2128 | else | |
2129 | set_opt(sbi->s_mount_opt, JOURNAL_DATA); | |
2130 | break; | |
2131 | ||
617ba13b MC |
2132 | case EXT4_MOUNT_ORDERED_DATA: |
2133 | case EXT4_MOUNT_WRITEBACK_DATA: | |
dab291af MC |
2134 | if (!jbd2_journal_check_available_features |
2135 | (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) { | |
617ba13b | 2136 | printk(KERN_ERR "EXT4-fs: Journal does not support " |
ac27a0ec DK |
2137 | "requested data journaling mode\n"); |
2138 | goto failed_mount4; | |
2139 | } | |
2140 | default: | |
2141 | break; | |
2142 | } | |
2143 | ||
2144 | if (test_opt(sb, NOBH)) { | |
617ba13b MC |
2145 | if (!(test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)) { |
2146 | printk(KERN_WARNING "EXT4-fs: Ignoring nobh option - " | |
ac27a0ec DK |
2147 | "its supported only with writeback mode\n"); |
2148 | clear_opt(sbi->s_mount_opt, NOBH); | |
2149 | } | |
2150 | } | |
2151 | /* | |
dab291af | 2152 | * The jbd2_journal_load will have done any necessary log recovery, |
ac27a0ec DK |
2153 | * so we can safely mount the rest of the filesystem now. |
2154 | */ | |
2155 | ||
617ba13b | 2156 | root = iget(sb, EXT4_ROOT_INO); |
ac27a0ec DK |
2157 | sb->s_root = d_alloc_root(root); |
2158 | if (!sb->s_root) { | |
617ba13b | 2159 | printk(KERN_ERR "EXT4-fs: get root inode failed\n"); |
ac27a0ec DK |
2160 | iput(root); |
2161 | goto failed_mount4; | |
2162 | } | |
2163 | if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { | |
2164 | dput(sb->s_root); | |
2165 | sb->s_root = NULL; | |
617ba13b | 2166 | printk(KERN_ERR "EXT4-fs: corrupt root inode, run e2fsck\n"); |
ac27a0ec DK |
2167 | goto failed_mount4; |
2168 | } | |
2169 | ||
617ba13b | 2170 | ext4_setup_super (sb, es, sb->s_flags & MS_RDONLY); |
ef7f3835 KS |
2171 | |
2172 | /* determine the minimum size of new large inodes, if present */ | |
2173 | if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) { | |
2174 | sbi->s_want_extra_isize = sizeof(struct ext4_inode) - | |
2175 | EXT4_GOOD_OLD_INODE_SIZE; | |
2176 | if (EXT4_HAS_RO_COMPAT_FEATURE(sb, | |
2177 | EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) { | |
2178 | if (sbi->s_want_extra_isize < | |
2179 | le16_to_cpu(es->s_want_extra_isize)) | |
2180 | sbi->s_want_extra_isize = | |
2181 | le16_to_cpu(es->s_want_extra_isize); | |
2182 | if (sbi->s_want_extra_isize < | |
2183 | le16_to_cpu(es->s_min_extra_isize)) | |
2184 | sbi->s_want_extra_isize = | |
2185 | le16_to_cpu(es->s_min_extra_isize); | |
2186 | } | |
2187 | } | |
2188 | /* Check if enough inode space is available */ | |
2189 | if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize > | |
2190 | sbi->s_inode_size) { | |
2191 | sbi->s_want_extra_isize = sizeof(struct ext4_inode) - | |
2192 | EXT4_GOOD_OLD_INODE_SIZE; | |
2193 | printk(KERN_INFO "EXT4-fs: required extra inode space not" | |
2194 | "available.\n"); | |
2195 | } | |
2196 | ||
ac27a0ec DK |
2197 | /* |
2198 | * akpm: core read_super() calls in here with the superblock locked. | |
2199 | * That deadlocks, because orphan cleanup needs to lock the superblock | |
2200 | * in numerous places. Here we just pop the lock - it's relatively | |
2201 | * harmless, because we are now ready to accept write_super() requests, | |
2202 | * and aviro says that's the only reason for hanging onto the | |
2203 | * superblock lock. | |
2204 | */ | |
617ba13b MC |
2205 | EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS; |
2206 | ext4_orphan_cleanup(sb, es); | |
2207 | EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS; | |
ac27a0ec | 2208 | if (needs_recovery) |
617ba13b MC |
2209 | printk (KERN_INFO "EXT4-fs: recovery complete.\n"); |
2210 | ext4_mark_recovery_complete(sb, es); | |
2211 | printk (KERN_INFO "EXT4-fs: mounted filesystem with %s data mode.\n", | |
2212 | test_opt(sb,DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA ? "journal": | |
2213 | test_opt(sb,DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA ? "ordered": | |
ac27a0ec DK |
2214 | "writeback"); |
2215 | ||
a86c6181 AT |
2216 | ext4_ext_init(sb); |
2217 | ||
ac27a0ec DK |
2218 | lock_kernel(); |
2219 | return 0; | |
2220 | ||
617ba13b | 2221 | cantfind_ext4: |
ac27a0ec | 2222 | if (!silent) |
617ba13b | 2223 | printk(KERN_ERR "VFS: Can't find ext4 filesystem on dev %s.\n", |
ac27a0ec DK |
2224 | sb->s_id); |
2225 | goto failed_mount; | |
2226 | ||
2227 | failed_mount4: | |
dab291af | 2228 | jbd2_journal_destroy(sbi->s_journal); |
ac27a0ec DK |
2229 | failed_mount3: |
2230 | percpu_counter_destroy(&sbi->s_freeblocks_counter); | |
2231 | percpu_counter_destroy(&sbi->s_freeinodes_counter); | |
2232 | percpu_counter_destroy(&sbi->s_dirs_counter); | |
2233 | failed_mount2: | |
2234 | for (i = 0; i < db_count; i++) | |
2235 | brelse(sbi->s_group_desc[i]); | |
2236 | kfree(sbi->s_group_desc); | |
2237 | failed_mount: | |
2238 | #ifdef CONFIG_QUOTA | |
2239 | for (i = 0; i < MAXQUOTAS; i++) | |
2240 | kfree(sbi->s_qf_names[i]); | |
2241 | #endif | |
617ba13b | 2242 | ext4_blkdev_remove(sbi); |
ac27a0ec DK |
2243 | brelse(bh); |
2244 | out_fail: | |
2245 | sb->s_fs_info = NULL; | |
2246 | kfree(sbi); | |
2247 | lock_kernel(); | |
2248 | return -EINVAL; | |
2249 | } | |
2250 | ||
2251 | /* | |
2252 | * Setup any per-fs journal parameters now. We'll do this both on | |
2253 | * initial mount, once the journal has been initialised but before we've | |
2254 | * done any recovery; and again on any subsequent remount. | |
2255 | */ | |
617ba13b | 2256 | static void ext4_init_journal_params(struct super_block *sb, journal_t *journal) |
ac27a0ec | 2257 | { |
617ba13b | 2258 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
ac27a0ec DK |
2259 | |
2260 | if (sbi->s_commit_interval) | |
2261 | journal->j_commit_interval = sbi->s_commit_interval; | |
617ba13b | 2262 | /* We could also set up an ext4-specific default for the commit |
ac27a0ec DK |
2263 | * interval here, but for now we'll just fall back to the jbd |
2264 | * default. */ | |
2265 | ||
2266 | spin_lock(&journal->j_state_lock); | |
2267 | if (test_opt(sb, BARRIER)) | |
dab291af | 2268 | journal->j_flags |= JBD2_BARRIER; |
ac27a0ec | 2269 | else |
dab291af | 2270 | journal->j_flags &= ~JBD2_BARRIER; |
ac27a0ec DK |
2271 | spin_unlock(&journal->j_state_lock); |
2272 | } | |
2273 | ||
617ba13b | 2274 | static journal_t *ext4_get_journal(struct super_block *sb, |
ac27a0ec DK |
2275 | unsigned int journal_inum) |
2276 | { | |
2277 | struct inode *journal_inode; | |
2278 | journal_t *journal; | |
2279 | ||
2280 | /* First, test for the existence of a valid inode on disk. Bad | |
2281 | * things happen if we iget() an unused inode, as the subsequent | |
2282 | * iput() will try to delete it. */ | |
2283 | ||
2284 | journal_inode = iget(sb, journal_inum); | |
2285 | if (!journal_inode) { | |
617ba13b | 2286 | printk(KERN_ERR "EXT4-fs: no journal found.\n"); |
ac27a0ec DK |
2287 | return NULL; |
2288 | } | |
2289 | if (!journal_inode->i_nlink) { | |
2290 | make_bad_inode(journal_inode); | |
2291 | iput(journal_inode); | |
617ba13b | 2292 | printk(KERN_ERR "EXT4-fs: journal inode is deleted.\n"); |
ac27a0ec DK |
2293 | return NULL; |
2294 | } | |
2295 | ||
2296 | jbd_debug(2, "Journal inode found at %p: %Ld bytes\n", | |
2297 | journal_inode, journal_inode->i_size); | |
2298 | if (is_bad_inode(journal_inode) || !S_ISREG(journal_inode->i_mode)) { | |
617ba13b | 2299 | printk(KERN_ERR "EXT4-fs: invalid journal inode.\n"); |
ac27a0ec DK |
2300 | iput(journal_inode); |
2301 | return NULL; | |
2302 | } | |
2303 | ||
dab291af | 2304 | journal = jbd2_journal_init_inode(journal_inode); |
ac27a0ec | 2305 | if (!journal) { |
617ba13b | 2306 | printk(KERN_ERR "EXT4-fs: Could not load journal inode\n"); |
ac27a0ec DK |
2307 | iput(journal_inode); |
2308 | return NULL; | |
2309 | } | |
2310 | journal->j_private = sb; | |
617ba13b | 2311 | ext4_init_journal_params(sb, journal); |
ac27a0ec DK |
2312 | return journal; |
2313 | } | |
2314 | ||
617ba13b | 2315 | static journal_t *ext4_get_dev_journal(struct super_block *sb, |
ac27a0ec DK |
2316 | dev_t j_dev) |
2317 | { | |
2318 | struct buffer_head * bh; | |
2319 | journal_t *journal; | |
617ba13b MC |
2320 | ext4_fsblk_t start; |
2321 | ext4_fsblk_t len; | |
ac27a0ec | 2322 | int hblock, blocksize; |
617ba13b | 2323 | ext4_fsblk_t sb_block; |
ac27a0ec | 2324 | unsigned long offset; |
617ba13b | 2325 | struct ext4_super_block * es; |
ac27a0ec DK |
2326 | struct block_device *bdev; |
2327 | ||
617ba13b | 2328 | bdev = ext4_blkdev_get(j_dev); |
ac27a0ec DK |
2329 | if (bdev == NULL) |
2330 | return NULL; | |
2331 | ||
2332 | if (bd_claim(bdev, sb)) { | |
2333 | printk(KERN_ERR | |
8c55e204 | 2334 | "EXT4: failed to claim external journal device.\n"); |
ac27a0ec DK |
2335 | blkdev_put(bdev); |
2336 | return NULL; | |
2337 | } | |
2338 | ||
2339 | blocksize = sb->s_blocksize; | |
2340 | hblock = bdev_hardsect_size(bdev); | |
2341 | if (blocksize < hblock) { | |
2342 | printk(KERN_ERR | |
617ba13b | 2343 | "EXT4-fs: blocksize too small for journal device.\n"); |
ac27a0ec DK |
2344 | goto out_bdev; |
2345 | } | |
2346 | ||
617ba13b MC |
2347 | sb_block = EXT4_MIN_BLOCK_SIZE / blocksize; |
2348 | offset = EXT4_MIN_BLOCK_SIZE % blocksize; | |
ac27a0ec DK |
2349 | set_blocksize(bdev, blocksize); |
2350 | if (!(bh = __bread(bdev, sb_block, blocksize))) { | |
617ba13b | 2351 | printk(KERN_ERR "EXT4-fs: couldn't read superblock of " |
ac27a0ec DK |
2352 | "external journal\n"); |
2353 | goto out_bdev; | |
2354 | } | |
2355 | ||
617ba13b MC |
2356 | es = (struct ext4_super_block *) (((char *)bh->b_data) + offset); |
2357 | if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) || | |
ac27a0ec | 2358 | !(le32_to_cpu(es->s_feature_incompat) & |
617ba13b MC |
2359 | EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) { |
2360 | printk(KERN_ERR "EXT4-fs: external journal has " | |
ac27a0ec DK |
2361 | "bad superblock\n"); |
2362 | brelse(bh); | |
2363 | goto out_bdev; | |
2364 | } | |
2365 | ||
617ba13b MC |
2366 | if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) { |
2367 | printk(KERN_ERR "EXT4-fs: journal UUID does not match\n"); | |
ac27a0ec DK |
2368 | brelse(bh); |
2369 | goto out_bdev; | |
2370 | } | |
2371 | ||
bd81d8ee | 2372 | len = ext4_blocks_count(es); |
ac27a0ec DK |
2373 | start = sb_block + 1; |
2374 | brelse(bh); /* we're done with the superblock */ | |
2375 | ||
dab291af | 2376 | journal = jbd2_journal_init_dev(bdev, sb->s_bdev, |
ac27a0ec DK |
2377 | start, len, blocksize); |
2378 | if (!journal) { | |
617ba13b | 2379 | printk(KERN_ERR "EXT4-fs: failed to create device journal\n"); |
ac27a0ec DK |
2380 | goto out_bdev; |
2381 | } | |
2382 | journal->j_private = sb; | |
2383 | ll_rw_block(READ, 1, &journal->j_sb_buffer); | |
2384 | wait_on_buffer(journal->j_sb_buffer); | |
2385 | if (!buffer_uptodate(journal->j_sb_buffer)) { | |
617ba13b | 2386 | printk(KERN_ERR "EXT4-fs: I/O error on journal device\n"); |
ac27a0ec DK |
2387 | goto out_journal; |
2388 | } | |
2389 | if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) { | |
617ba13b | 2390 | printk(KERN_ERR "EXT4-fs: External journal has more than one " |
ac27a0ec DK |
2391 | "user (unsupported) - %d\n", |
2392 | be32_to_cpu(journal->j_superblock->s_nr_users)); | |
2393 | goto out_journal; | |
2394 | } | |
617ba13b MC |
2395 | EXT4_SB(sb)->journal_bdev = bdev; |
2396 | ext4_init_journal_params(sb, journal); | |
ac27a0ec DK |
2397 | return journal; |
2398 | out_journal: | |
dab291af | 2399 | jbd2_journal_destroy(journal); |
ac27a0ec | 2400 | out_bdev: |
617ba13b | 2401 | ext4_blkdev_put(bdev); |
ac27a0ec DK |
2402 | return NULL; |
2403 | } | |
2404 | ||
617ba13b MC |
2405 | static int ext4_load_journal(struct super_block *sb, |
2406 | struct ext4_super_block *es, | |
ac27a0ec DK |
2407 | unsigned long journal_devnum) |
2408 | { | |
2409 | journal_t *journal; | |
2410 | unsigned int journal_inum = le32_to_cpu(es->s_journal_inum); | |
2411 | dev_t journal_dev; | |
2412 | int err = 0; | |
2413 | int really_read_only; | |
2414 | ||
2415 | if (journal_devnum && | |
2416 | journal_devnum != le32_to_cpu(es->s_journal_dev)) { | |
617ba13b | 2417 | printk(KERN_INFO "EXT4-fs: external journal device major/minor " |
ac27a0ec DK |
2418 | "numbers have changed\n"); |
2419 | journal_dev = new_decode_dev(journal_devnum); | |
2420 | } else | |
2421 | journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev)); | |
2422 | ||
2423 | really_read_only = bdev_read_only(sb->s_bdev); | |
2424 | ||
2425 | /* | |
2426 | * Are we loading a blank journal or performing recovery after a | |
2427 | * crash? For recovery, we need to check in advance whether we | |
2428 | * can get read-write access to the device. | |
2429 | */ | |
2430 | ||
617ba13b | 2431 | if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) { |
ac27a0ec | 2432 | if (sb->s_flags & MS_RDONLY) { |
617ba13b | 2433 | printk(KERN_INFO "EXT4-fs: INFO: recovery " |
ac27a0ec DK |
2434 | "required on readonly filesystem.\n"); |
2435 | if (really_read_only) { | |
617ba13b | 2436 | printk(KERN_ERR "EXT4-fs: write access " |
ac27a0ec DK |
2437 | "unavailable, cannot proceed.\n"); |
2438 | return -EROFS; | |
2439 | } | |
617ba13b | 2440 | printk (KERN_INFO "EXT4-fs: write access will " |
ac27a0ec DK |
2441 | "be enabled during recovery.\n"); |
2442 | } | |
2443 | } | |
2444 | ||
2445 | if (journal_inum && journal_dev) { | |
617ba13b | 2446 | printk(KERN_ERR "EXT4-fs: filesystem has both journal " |
ac27a0ec DK |
2447 | "and inode journals!\n"); |
2448 | return -EINVAL; | |
2449 | } | |
2450 | ||
2451 | if (journal_inum) { | |
617ba13b | 2452 | if (!(journal = ext4_get_journal(sb, journal_inum))) |
ac27a0ec DK |
2453 | return -EINVAL; |
2454 | } else { | |
617ba13b | 2455 | if (!(journal = ext4_get_dev_journal(sb, journal_dev))) |
ac27a0ec DK |
2456 | return -EINVAL; |
2457 | } | |
2458 | ||
2459 | if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) { | |
dab291af | 2460 | err = jbd2_journal_update_format(journal); |
ac27a0ec | 2461 | if (err) { |
617ba13b | 2462 | printk(KERN_ERR "EXT4-fs: error updating journal.\n"); |
dab291af | 2463 | jbd2_journal_destroy(journal); |
ac27a0ec DK |
2464 | return err; |
2465 | } | |
2466 | } | |
2467 | ||
617ba13b | 2468 | if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) |
dab291af | 2469 | err = jbd2_journal_wipe(journal, !really_read_only); |
ac27a0ec | 2470 | if (!err) |
dab291af | 2471 | err = jbd2_journal_load(journal); |
ac27a0ec DK |
2472 | |
2473 | if (err) { | |
617ba13b | 2474 | printk(KERN_ERR "EXT4-fs: error loading journal.\n"); |
dab291af | 2475 | jbd2_journal_destroy(journal); |
ac27a0ec DK |
2476 | return err; |
2477 | } | |
2478 | ||
617ba13b MC |
2479 | EXT4_SB(sb)->s_journal = journal; |
2480 | ext4_clear_journal_err(sb, es); | |
ac27a0ec DK |
2481 | |
2482 | if (journal_devnum && | |
2483 | journal_devnum != le32_to_cpu(es->s_journal_dev)) { | |
2484 | es->s_journal_dev = cpu_to_le32(journal_devnum); | |
2485 | sb->s_dirt = 1; | |
2486 | ||
2487 | /* Make sure we flush the recovery flag to disk. */ | |
617ba13b | 2488 | ext4_commit_super(sb, es, 1); |
ac27a0ec DK |
2489 | } |
2490 | ||
2491 | return 0; | |
2492 | } | |
2493 | ||
617ba13b MC |
2494 | static int ext4_create_journal(struct super_block * sb, |
2495 | struct ext4_super_block * es, | |
ac27a0ec DK |
2496 | unsigned int journal_inum) |
2497 | { | |
2498 | journal_t *journal; | |
6c675bd4 | 2499 | int err; |
ac27a0ec DK |
2500 | |
2501 | if (sb->s_flags & MS_RDONLY) { | |
617ba13b | 2502 | printk(KERN_ERR "EXT4-fs: readonly filesystem when trying to " |
ac27a0ec DK |
2503 | "create journal.\n"); |
2504 | return -EROFS; | |
2505 | } | |
2506 | ||
6c675bd4 BP |
2507 | journal = ext4_get_journal(sb, journal_inum); |
2508 | if (!journal) | |
ac27a0ec DK |
2509 | return -EINVAL; |
2510 | ||
617ba13b | 2511 | printk(KERN_INFO "EXT4-fs: creating new journal on inode %u\n", |
ac27a0ec DK |
2512 | journal_inum); |
2513 | ||
6c675bd4 BP |
2514 | err = jbd2_journal_create(journal); |
2515 | if (err) { | |
617ba13b | 2516 | printk(KERN_ERR "EXT4-fs: error creating journal.\n"); |
dab291af | 2517 | jbd2_journal_destroy(journal); |
ac27a0ec DK |
2518 | return -EIO; |
2519 | } | |
2520 | ||
617ba13b | 2521 | EXT4_SB(sb)->s_journal = journal; |
ac27a0ec | 2522 | |
617ba13b MC |
2523 | ext4_update_dynamic_rev(sb); |
2524 | EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); | |
2525 | EXT4_SET_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL); | |
ac27a0ec DK |
2526 | |
2527 | es->s_journal_inum = cpu_to_le32(journal_inum); | |
2528 | sb->s_dirt = 1; | |
2529 | ||
2530 | /* Make sure we flush the recovery flag to disk. */ | |
617ba13b | 2531 | ext4_commit_super(sb, es, 1); |
ac27a0ec DK |
2532 | |
2533 | return 0; | |
2534 | } | |
2535 | ||
617ba13b MC |
2536 | static void ext4_commit_super (struct super_block * sb, |
2537 | struct ext4_super_block * es, | |
ac27a0ec DK |
2538 | int sync) |
2539 | { | |
617ba13b | 2540 | struct buffer_head *sbh = EXT4_SB(sb)->s_sbh; |
ac27a0ec DK |
2541 | |
2542 | if (!sbh) | |
2543 | return; | |
2544 | es->s_wtime = cpu_to_le32(get_seconds()); | |
bd81d8ee | 2545 | ext4_free_blocks_count_set(es, ext4_count_free_blocks(sb)); |
617ba13b | 2546 | es->s_free_inodes_count = cpu_to_le32(ext4_count_free_inodes(sb)); |
ac27a0ec DK |
2547 | BUFFER_TRACE(sbh, "marking dirty"); |
2548 | mark_buffer_dirty(sbh); | |
2549 | if (sync) | |
2550 | sync_dirty_buffer(sbh); | |
2551 | } | |
2552 | ||
2553 | ||
2554 | /* | |
2555 | * Have we just finished recovery? If so, and if we are mounting (or | |
2556 | * remounting) the filesystem readonly, then we will end up with a | |
2557 | * consistent fs on disk. Record that fact. | |
2558 | */ | |
617ba13b MC |
2559 | static void ext4_mark_recovery_complete(struct super_block * sb, |
2560 | struct ext4_super_block * es) | |
ac27a0ec | 2561 | { |
617ba13b | 2562 | journal_t *journal = EXT4_SB(sb)->s_journal; |
ac27a0ec | 2563 | |
dab291af MC |
2564 | jbd2_journal_lock_updates(journal); |
2565 | jbd2_journal_flush(journal); | |
32c37730 | 2566 | lock_super(sb); |
617ba13b | 2567 | if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) && |
ac27a0ec | 2568 | sb->s_flags & MS_RDONLY) { |
617ba13b | 2569 | EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); |
ac27a0ec | 2570 | sb->s_dirt = 0; |
617ba13b | 2571 | ext4_commit_super(sb, es, 1); |
ac27a0ec | 2572 | } |
32c37730 | 2573 | unlock_super(sb); |
dab291af | 2574 | jbd2_journal_unlock_updates(journal); |
ac27a0ec DK |
2575 | } |
2576 | ||
2577 | /* | |
2578 | * If we are mounting (or read-write remounting) a filesystem whose journal | |
2579 | * has recorded an error from a previous lifetime, move that error to the | |
2580 | * main filesystem now. | |
2581 | */ | |
617ba13b MC |
2582 | static void ext4_clear_journal_err(struct super_block * sb, |
2583 | struct ext4_super_block * es) | |
ac27a0ec DK |
2584 | { |
2585 | journal_t *journal; | |
2586 | int j_errno; | |
2587 | const char *errstr; | |
2588 | ||
617ba13b | 2589 | journal = EXT4_SB(sb)->s_journal; |
ac27a0ec DK |
2590 | |
2591 | /* | |
2592 | * Now check for any error status which may have been recorded in the | |
617ba13b | 2593 | * journal by a prior ext4_error() or ext4_abort() |
ac27a0ec DK |
2594 | */ |
2595 | ||
dab291af | 2596 | j_errno = jbd2_journal_errno(journal); |
ac27a0ec DK |
2597 | if (j_errno) { |
2598 | char nbuf[16]; | |
2599 | ||
617ba13b MC |
2600 | errstr = ext4_decode_error(sb, j_errno, nbuf); |
2601 | ext4_warning(sb, __FUNCTION__, "Filesystem error recorded " | |
ac27a0ec | 2602 | "from previous mount: %s", errstr); |
617ba13b | 2603 | ext4_warning(sb, __FUNCTION__, "Marking fs in need of " |
ac27a0ec DK |
2604 | "filesystem check."); |
2605 | ||
617ba13b MC |
2606 | EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; |
2607 | es->s_state |= cpu_to_le16(EXT4_ERROR_FS); | |
2608 | ext4_commit_super (sb, es, 1); | |
ac27a0ec | 2609 | |
dab291af | 2610 | jbd2_journal_clear_err(journal); |
ac27a0ec DK |
2611 | } |
2612 | } | |
2613 | ||
2614 | /* | |
2615 | * Force the running and committing transactions to commit, | |
2616 | * and wait on the commit. | |
2617 | */ | |
617ba13b | 2618 | int ext4_force_commit(struct super_block *sb) |
ac27a0ec DK |
2619 | { |
2620 | journal_t *journal; | |
2621 | int ret; | |
2622 | ||
2623 | if (sb->s_flags & MS_RDONLY) | |
2624 | return 0; | |
2625 | ||
617ba13b | 2626 | journal = EXT4_SB(sb)->s_journal; |
ac27a0ec | 2627 | sb->s_dirt = 0; |
617ba13b | 2628 | ret = ext4_journal_force_commit(journal); |
ac27a0ec DK |
2629 | return ret; |
2630 | } | |
2631 | ||
2632 | /* | |
617ba13b | 2633 | * Ext4 always journals updates to the superblock itself, so we don't |
ac27a0ec DK |
2634 | * have to propagate any other updates to the superblock on disk at this |
2635 | * point. Just start an async writeback to get the buffers on their way | |
2636 | * to the disk. | |
2637 | * | |
2638 | * This implicitly triggers the writebehind on sync(). | |
2639 | */ | |
2640 | ||
617ba13b | 2641 | static void ext4_write_super (struct super_block * sb) |
ac27a0ec DK |
2642 | { |
2643 | if (mutex_trylock(&sb->s_lock) != 0) | |
2644 | BUG(); | |
2645 | sb->s_dirt = 0; | |
2646 | } | |
2647 | ||
617ba13b | 2648 | static int ext4_sync_fs(struct super_block *sb, int wait) |
ac27a0ec DK |
2649 | { |
2650 | tid_t target; | |
2651 | ||
2652 | sb->s_dirt = 0; | |
dab291af | 2653 | if (jbd2_journal_start_commit(EXT4_SB(sb)->s_journal, &target)) { |
ac27a0ec | 2654 | if (wait) |
dab291af | 2655 | jbd2_log_wait_commit(EXT4_SB(sb)->s_journal, target); |
ac27a0ec DK |
2656 | } |
2657 | return 0; | |
2658 | } | |
2659 | ||
2660 | /* | |
2661 | * LVM calls this function before a (read-only) snapshot is created. This | |
2662 | * gives us a chance to flush the journal completely and mark the fs clean. | |
2663 | */ | |
617ba13b | 2664 | static void ext4_write_super_lockfs(struct super_block *sb) |
ac27a0ec DK |
2665 | { |
2666 | sb->s_dirt = 0; | |
2667 | ||
2668 | if (!(sb->s_flags & MS_RDONLY)) { | |
617ba13b | 2669 | journal_t *journal = EXT4_SB(sb)->s_journal; |
ac27a0ec DK |
2670 | |
2671 | /* Now we set up the journal barrier. */ | |
dab291af MC |
2672 | jbd2_journal_lock_updates(journal); |
2673 | jbd2_journal_flush(journal); | |
ac27a0ec DK |
2674 | |
2675 | /* Journal blocked and flushed, clear needs_recovery flag. */ | |
617ba13b MC |
2676 | EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); |
2677 | ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1); | |
ac27a0ec DK |
2678 | } |
2679 | } | |
2680 | ||
2681 | /* | |
2682 | * Called by LVM after the snapshot is done. We need to reset the RECOVER | |
2683 | * flag here, even though the filesystem is not technically dirty yet. | |
2684 | */ | |
617ba13b | 2685 | static void ext4_unlockfs(struct super_block *sb) |
ac27a0ec DK |
2686 | { |
2687 | if (!(sb->s_flags & MS_RDONLY)) { | |
2688 | lock_super(sb); | |
2689 | /* Reser the needs_recovery flag before the fs is unlocked. */ | |
617ba13b MC |
2690 | EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); |
2691 | ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1); | |
ac27a0ec | 2692 | unlock_super(sb); |
dab291af | 2693 | jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); |
ac27a0ec DK |
2694 | } |
2695 | } | |
2696 | ||
617ba13b | 2697 | static int ext4_remount (struct super_block * sb, int * flags, char * data) |
ac27a0ec | 2698 | { |
617ba13b MC |
2699 | struct ext4_super_block * es; |
2700 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
2701 | ext4_fsblk_t n_blocks_count = 0; | |
ac27a0ec | 2702 | unsigned long old_sb_flags; |
617ba13b | 2703 | struct ext4_mount_options old_opts; |
ac27a0ec DK |
2704 | int err; |
2705 | #ifdef CONFIG_QUOTA | |
2706 | int i; | |
2707 | #endif | |
2708 | ||
2709 | /* Store the original options */ | |
2710 | old_sb_flags = sb->s_flags; | |
2711 | old_opts.s_mount_opt = sbi->s_mount_opt; | |
2712 | old_opts.s_resuid = sbi->s_resuid; | |
2713 | old_opts.s_resgid = sbi->s_resgid; | |
2714 | old_opts.s_commit_interval = sbi->s_commit_interval; | |
2715 | #ifdef CONFIG_QUOTA | |
2716 | old_opts.s_jquota_fmt = sbi->s_jquota_fmt; | |
2717 | for (i = 0; i < MAXQUOTAS; i++) | |
2718 | old_opts.s_qf_names[i] = sbi->s_qf_names[i]; | |
2719 | #endif | |
2720 | ||
2721 | /* | |
2722 | * Allow the "check" option to be passed as a remount option. | |
2723 | */ | |
2724 | if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) { | |
2725 | err = -EINVAL; | |
2726 | goto restore_opts; | |
2727 | } | |
2728 | ||
617ba13b MC |
2729 | if (sbi->s_mount_opt & EXT4_MOUNT_ABORT) |
2730 | ext4_abort(sb, __FUNCTION__, "Abort forced by user"); | |
ac27a0ec DK |
2731 | |
2732 | sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | | |
617ba13b | 2733 | ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0); |
ac27a0ec DK |
2734 | |
2735 | es = sbi->s_es; | |
2736 | ||
617ba13b | 2737 | ext4_init_journal_params(sb, sbi->s_journal); |
ac27a0ec DK |
2738 | |
2739 | if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) || | |
bd81d8ee | 2740 | n_blocks_count > ext4_blocks_count(es)) { |
617ba13b | 2741 | if (sbi->s_mount_opt & EXT4_MOUNT_ABORT) { |
ac27a0ec DK |
2742 | err = -EROFS; |
2743 | goto restore_opts; | |
2744 | } | |
2745 | ||
2746 | if (*flags & MS_RDONLY) { | |
2747 | /* | |
2748 | * First of all, the unconditional stuff we have to do | |
2749 | * to disable replay of the journal when we next remount | |
2750 | */ | |
2751 | sb->s_flags |= MS_RDONLY; | |
2752 | ||
2753 | /* | |
2754 | * OK, test if we are remounting a valid rw partition | |
2755 | * readonly, and if so set the rdonly flag and then | |
2756 | * mark the partition as valid again. | |
2757 | */ | |
617ba13b MC |
2758 | if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) && |
2759 | (sbi->s_mount_state & EXT4_VALID_FS)) | |
ac27a0ec DK |
2760 | es->s_state = cpu_to_le16(sbi->s_mount_state); |
2761 | ||
32c37730 JK |
2762 | /* |
2763 | * We have to unlock super so that we can wait for | |
2764 | * transactions. | |
2765 | */ | |
2766 | unlock_super(sb); | |
617ba13b | 2767 | ext4_mark_recovery_complete(sb, es); |
32c37730 | 2768 | lock_super(sb); |
ac27a0ec DK |
2769 | } else { |
2770 | __le32 ret; | |
617ba13b MC |
2771 | if ((ret = EXT4_HAS_RO_COMPAT_FEATURE(sb, |
2772 | ~EXT4_FEATURE_RO_COMPAT_SUPP))) { | |
2773 | printk(KERN_WARNING "EXT4-fs: %s: couldn't " | |
ac27a0ec DK |
2774 | "remount RDWR because of unsupported " |
2775 | "optional features (%x).\n", | |
2776 | sb->s_id, le32_to_cpu(ret)); | |
2777 | err = -EROFS; | |
2778 | goto restore_opts; | |
2779 | } | |
ead6596b ES |
2780 | |
2781 | /* | |
2782 | * If we have an unprocessed orphan list hanging | |
2783 | * around from a previously readonly bdev mount, | |
2784 | * require a full umount/remount for now. | |
2785 | */ | |
2786 | if (es->s_last_orphan) { | |
2787 | printk(KERN_WARNING "EXT4-fs: %s: couldn't " | |
2788 | "remount RDWR because of unprocessed " | |
2789 | "orphan inode list. Please " | |
2790 | "umount/remount instead.\n", | |
2791 | sb->s_id); | |
2792 | err = -EINVAL; | |
2793 | goto restore_opts; | |
2794 | } | |
2795 | ||
ac27a0ec DK |
2796 | /* |
2797 | * Mounting a RDONLY partition read-write, so reread | |
2798 | * and store the current valid flag. (It may have | |
2799 | * been changed by e2fsck since we originally mounted | |
2800 | * the partition.) | |
2801 | */ | |
617ba13b | 2802 | ext4_clear_journal_err(sb, es); |
ac27a0ec | 2803 | sbi->s_mount_state = le16_to_cpu(es->s_state); |
617ba13b | 2804 | if ((err = ext4_group_extend(sb, es, n_blocks_count))) |
ac27a0ec | 2805 | goto restore_opts; |
617ba13b | 2806 | if (!ext4_setup_super (sb, es, 0)) |
ac27a0ec DK |
2807 | sb->s_flags &= ~MS_RDONLY; |
2808 | } | |
2809 | } | |
2810 | #ifdef CONFIG_QUOTA | |
2811 | /* Release old quota file names */ | |
2812 | for (i = 0; i < MAXQUOTAS; i++) | |
2813 | if (old_opts.s_qf_names[i] && | |
2814 | old_opts.s_qf_names[i] != sbi->s_qf_names[i]) | |
2815 | kfree(old_opts.s_qf_names[i]); | |
2816 | #endif | |
2817 | return 0; | |
2818 | restore_opts: | |
2819 | sb->s_flags = old_sb_flags; | |
2820 | sbi->s_mount_opt = old_opts.s_mount_opt; | |
2821 | sbi->s_resuid = old_opts.s_resuid; | |
2822 | sbi->s_resgid = old_opts.s_resgid; | |
2823 | sbi->s_commit_interval = old_opts.s_commit_interval; | |
2824 | #ifdef CONFIG_QUOTA | |
2825 | sbi->s_jquota_fmt = old_opts.s_jquota_fmt; | |
2826 | for (i = 0; i < MAXQUOTAS; i++) { | |
2827 | if (sbi->s_qf_names[i] && | |
2828 | old_opts.s_qf_names[i] != sbi->s_qf_names[i]) | |
2829 | kfree(sbi->s_qf_names[i]); | |
2830 | sbi->s_qf_names[i] = old_opts.s_qf_names[i]; | |
2831 | } | |
2832 | #endif | |
2833 | return err; | |
2834 | } | |
2835 | ||
617ba13b | 2836 | static int ext4_statfs (struct dentry * dentry, struct kstatfs * buf) |
ac27a0ec DK |
2837 | { |
2838 | struct super_block *sb = dentry->d_sb; | |
617ba13b MC |
2839 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
2840 | struct ext4_super_block *es = sbi->s_es; | |
960cc398 | 2841 | u64 fsid; |
ac27a0ec | 2842 | |
5e70030d BP |
2843 | if (test_opt(sb, MINIX_DF)) { |
2844 | sbi->s_overhead_last = 0; | |
6bc9feff | 2845 | } else if (sbi->s_blocks_last != ext4_blocks_count(es)) { |
fd2d4291 | 2846 | ext4_group_t ngroups = sbi->s_groups_count, i; |
5e70030d | 2847 | ext4_fsblk_t overhead = 0; |
ac27a0ec DK |
2848 | smp_rmb(); |
2849 | ||
2850 | /* | |
5e70030d BP |
2851 | * Compute the overhead (FS structures). This is constant |
2852 | * for a given filesystem unless the number of block groups | |
2853 | * changes so we cache the previous value until it does. | |
ac27a0ec DK |
2854 | */ |
2855 | ||
2856 | /* | |
2857 | * All of the blocks before first_data_block are | |
2858 | * overhead | |
2859 | */ | |
2860 | overhead = le32_to_cpu(es->s_first_data_block); | |
2861 | ||
2862 | /* | |
2863 | * Add the overhead attributed to the superblock and | |
2864 | * block group descriptors. If the sparse superblocks | |
2865 | * feature is turned on, then not all groups have this. | |
2866 | */ | |
2867 | for (i = 0; i < ngroups; i++) { | |
617ba13b MC |
2868 | overhead += ext4_bg_has_super(sb, i) + |
2869 | ext4_bg_num_gdb(sb, i); | |
ac27a0ec DK |
2870 | cond_resched(); |
2871 | } | |
2872 | ||
2873 | /* | |
2874 | * Every block group has an inode bitmap, a block | |
2875 | * bitmap, and an inode table. | |
2876 | */ | |
5e70030d BP |
2877 | overhead += ngroups * (2 + sbi->s_itb_per_group); |
2878 | sbi->s_overhead_last = overhead; | |
2879 | smp_wmb(); | |
6bc9feff | 2880 | sbi->s_blocks_last = ext4_blocks_count(es); |
ac27a0ec DK |
2881 | } |
2882 | ||
617ba13b | 2883 | buf->f_type = EXT4_SUPER_MAGIC; |
ac27a0ec | 2884 | buf->f_bsize = sb->s_blocksize; |
5e70030d | 2885 | buf->f_blocks = ext4_blocks_count(es) - sbi->s_overhead_last; |
52d9f3b4 | 2886 | buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter); |
308ba3ec | 2887 | ext4_free_blocks_count_set(es, buf->f_bfree); |
bd81d8ee LV |
2888 | buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es); |
2889 | if (buf->f_bfree < ext4_r_blocks_count(es)) | |
ac27a0ec DK |
2890 | buf->f_bavail = 0; |
2891 | buf->f_files = le32_to_cpu(es->s_inodes_count); | |
52d9f3b4 | 2892 | buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter); |
5e70030d | 2893 | es->s_free_inodes_count = cpu_to_le32(buf->f_ffree); |
617ba13b | 2894 | buf->f_namelen = EXT4_NAME_LEN; |
960cc398 PE |
2895 | fsid = le64_to_cpup((void *)es->s_uuid) ^ |
2896 | le64_to_cpup((void *)es->s_uuid + sizeof(u64)); | |
2897 | buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL; | |
2898 | buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL; | |
ac27a0ec DK |
2899 | return 0; |
2900 | } | |
2901 | ||
2902 | /* Helper function for writing quotas on sync - we need to start transaction before quota file | |
2903 | * is locked for write. Otherwise the are possible deadlocks: | |
2904 | * Process 1 Process 2 | |
617ba13b | 2905 | * ext4_create() quota_sync() |
dab291af | 2906 | * jbd2_journal_start() write_dquot() |
ac27a0ec | 2907 | * DQUOT_INIT() down(dqio_mutex) |
dab291af | 2908 | * down(dqio_mutex) jbd2_journal_start() |
ac27a0ec DK |
2909 | * |
2910 | */ | |
2911 | ||
2912 | #ifdef CONFIG_QUOTA | |
2913 | ||
2914 | static inline struct inode *dquot_to_inode(struct dquot *dquot) | |
2915 | { | |
2916 | return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type]; | |
2917 | } | |
2918 | ||
617ba13b | 2919 | static int ext4_dquot_initialize(struct inode *inode, int type) |
ac27a0ec DK |
2920 | { |
2921 | handle_t *handle; | |
2922 | int ret, err; | |
2923 | ||
2924 | /* We may create quota structure so we need to reserve enough blocks */ | |
617ba13b | 2925 | handle = ext4_journal_start(inode, 2*EXT4_QUOTA_INIT_BLOCKS(inode->i_sb)); |
ac27a0ec DK |
2926 | if (IS_ERR(handle)) |
2927 | return PTR_ERR(handle); | |
2928 | ret = dquot_initialize(inode, type); | |
617ba13b | 2929 | err = ext4_journal_stop(handle); |
ac27a0ec DK |
2930 | if (!ret) |
2931 | ret = err; | |
2932 | return ret; | |
2933 | } | |
2934 | ||
617ba13b | 2935 | static int ext4_dquot_drop(struct inode *inode) |
ac27a0ec DK |
2936 | { |
2937 | handle_t *handle; | |
2938 | int ret, err; | |
2939 | ||
2940 | /* We may delete quota structure so we need to reserve enough blocks */ | |
617ba13b | 2941 | handle = ext4_journal_start(inode, 2*EXT4_QUOTA_DEL_BLOCKS(inode->i_sb)); |
ac27a0ec DK |
2942 | if (IS_ERR(handle)) |
2943 | return PTR_ERR(handle); | |
2944 | ret = dquot_drop(inode); | |
617ba13b | 2945 | err = ext4_journal_stop(handle); |
ac27a0ec DK |
2946 | if (!ret) |
2947 | ret = err; | |
2948 | return ret; | |
2949 | } | |
2950 | ||
617ba13b | 2951 | static int ext4_write_dquot(struct dquot *dquot) |
ac27a0ec DK |
2952 | { |
2953 | int ret, err; | |
2954 | handle_t *handle; | |
2955 | struct inode *inode; | |
2956 | ||
2957 | inode = dquot_to_inode(dquot); | |
617ba13b MC |
2958 | handle = ext4_journal_start(inode, |
2959 | EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb)); | |
ac27a0ec DK |
2960 | if (IS_ERR(handle)) |
2961 | return PTR_ERR(handle); | |
2962 | ret = dquot_commit(dquot); | |
617ba13b | 2963 | err = ext4_journal_stop(handle); |
ac27a0ec DK |
2964 | if (!ret) |
2965 | ret = err; | |
2966 | return ret; | |
2967 | } | |
2968 | ||
617ba13b | 2969 | static int ext4_acquire_dquot(struct dquot *dquot) |
ac27a0ec DK |
2970 | { |
2971 | int ret, err; | |
2972 | handle_t *handle; | |
2973 | ||
617ba13b MC |
2974 | handle = ext4_journal_start(dquot_to_inode(dquot), |
2975 | EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb)); | |
ac27a0ec DK |
2976 | if (IS_ERR(handle)) |
2977 | return PTR_ERR(handle); | |
2978 | ret = dquot_acquire(dquot); | |
617ba13b | 2979 | err = ext4_journal_stop(handle); |
ac27a0ec DK |
2980 | if (!ret) |
2981 | ret = err; | |
2982 | return ret; | |
2983 | } | |
2984 | ||
617ba13b | 2985 | static int ext4_release_dquot(struct dquot *dquot) |
ac27a0ec DK |
2986 | { |
2987 | int ret, err; | |
2988 | handle_t *handle; | |
2989 | ||
617ba13b MC |
2990 | handle = ext4_journal_start(dquot_to_inode(dquot), |
2991 | EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb)); | |
9c3013e9 JK |
2992 | if (IS_ERR(handle)) { |
2993 | /* Release dquot anyway to avoid endless cycle in dqput() */ | |
2994 | dquot_release(dquot); | |
ac27a0ec | 2995 | return PTR_ERR(handle); |
9c3013e9 | 2996 | } |
ac27a0ec | 2997 | ret = dquot_release(dquot); |
617ba13b | 2998 | err = ext4_journal_stop(handle); |
ac27a0ec DK |
2999 | if (!ret) |
3000 | ret = err; | |
3001 | return ret; | |
3002 | } | |
3003 | ||
617ba13b | 3004 | static int ext4_mark_dquot_dirty(struct dquot *dquot) |
ac27a0ec DK |
3005 | { |
3006 | /* Are we journalling quotas? */ | |
617ba13b MC |
3007 | if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] || |
3008 | EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) { | |
ac27a0ec | 3009 | dquot_mark_dquot_dirty(dquot); |
617ba13b | 3010 | return ext4_write_dquot(dquot); |
ac27a0ec DK |
3011 | } else { |
3012 | return dquot_mark_dquot_dirty(dquot); | |
3013 | } | |
3014 | } | |
3015 | ||
617ba13b | 3016 | static int ext4_write_info(struct super_block *sb, int type) |
ac27a0ec DK |
3017 | { |
3018 | int ret, err; | |
3019 | handle_t *handle; | |
3020 | ||
3021 | /* Data block + inode block */ | |
617ba13b | 3022 | handle = ext4_journal_start(sb->s_root->d_inode, 2); |
ac27a0ec DK |
3023 | if (IS_ERR(handle)) |
3024 | return PTR_ERR(handle); | |
3025 | ret = dquot_commit_info(sb, type); | |
617ba13b | 3026 | err = ext4_journal_stop(handle); |
ac27a0ec DK |
3027 | if (!ret) |
3028 | ret = err; | |
3029 | return ret; | |
3030 | } | |
3031 | ||
3032 | /* | |
3033 | * Turn on quotas during mount time - we need to find | |
3034 | * the quota file and such... | |
3035 | */ | |
617ba13b | 3036 | static int ext4_quota_on_mount(struct super_block *sb, int type) |
ac27a0ec | 3037 | { |
617ba13b MC |
3038 | return vfs_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type], |
3039 | EXT4_SB(sb)->s_jquota_fmt, type); | |
ac27a0ec DK |
3040 | } |
3041 | ||
3042 | /* | |
3043 | * Standard function to be called on quota_on | |
3044 | */ | |
617ba13b | 3045 | static int ext4_quota_on(struct super_block *sb, int type, int format_id, |
ac27a0ec DK |
3046 | char *path) |
3047 | { | |
3048 | int err; | |
3049 | struct nameidata nd; | |
3050 | ||
3051 | if (!test_opt(sb, QUOTA)) | |
3052 | return -EINVAL; | |
3053 | /* Not journalling quota? */ | |
617ba13b MC |
3054 | if (!EXT4_SB(sb)->s_qf_names[USRQUOTA] && |
3055 | !EXT4_SB(sb)->s_qf_names[GRPQUOTA]) | |
ac27a0ec DK |
3056 | return vfs_quota_on(sb, type, format_id, path); |
3057 | err = path_lookup(path, LOOKUP_FOLLOW, &nd); | |
3058 | if (err) | |
3059 | return err; | |
3060 | /* Quotafile not on the same filesystem? */ | |
3061 | if (nd.mnt->mnt_sb != sb) { | |
3062 | path_release(&nd); | |
3063 | return -EXDEV; | |
3064 | } | |
3065 | /* Quotafile not of fs root? */ | |
3066 | if (nd.dentry->d_parent->d_inode != sb->s_root->d_inode) | |
3067 | printk(KERN_WARNING | |
617ba13b | 3068 | "EXT4-fs: Quota file not on filesystem root. " |
ac27a0ec DK |
3069 | "Journalled quota will not work.\n"); |
3070 | path_release(&nd); | |
3071 | return vfs_quota_on(sb, type, format_id, path); | |
3072 | } | |
3073 | ||
3074 | /* Read data from quotafile - avoid pagecache and such because we cannot afford | |
3075 | * acquiring the locks... As quota files are never truncated and quota code | |
3076 | * itself serializes the operations (and noone else should touch the files) | |
3077 | * we don't have to be afraid of races */ | |
617ba13b | 3078 | static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data, |
ac27a0ec DK |
3079 | size_t len, loff_t off) |
3080 | { | |
3081 | struct inode *inode = sb_dqopt(sb)->files[type]; | |
725d26d3 | 3082 | ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb); |
ac27a0ec DK |
3083 | int err = 0; |
3084 | int offset = off & (sb->s_blocksize - 1); | |
3085 | int tocopy; | |
3086 | size_t toread; | |
3087 | struct buffer_head *bh; | |
3088 | loff_t i_size = i_size_read(inode); | |
3089 | ||
3090 | if (off > i_size) | |
3091 | return 0; | |
3092 | if (off+len > i_size) | |
3093 | len = i_size-off; | |
3094 | toread = len; | |
3095 | while (toread > 0) { | |
3096 | tocopy = sb->s_blocksize - offset < toread ? | |
3097 | sb->s_blocksize - offset : toread; | |
617ba13b | 3098 | bh = ext4_bread(NULL, inode, blk, 0, &err); |
ac27a0ec DK |
3099 | if (err) |
3100 | return err; | |
3101 | if (!bh) /* A hole? */ | |
3102 | memset(data, 0, tocopy); | |
3103 | else | |
3104 | memcpy(data, bh->b_data+offset, tocopy); | |
3105 | brelse(bh); | |
3106 | offset = 0; | |
3107 | toread -= tocopy; | |
3108 | data += tocopy; | |
3109 | blk++; | |
3110 | } | |
3111 | return len; | |
3112 | } | |
3113 | ||
3114 | /* Write to quotafile (we know the transaction is already started and has | |
3115 | * enough credits) */ | |
617ba13b | 3116 | static ssize_t ext4_quota_write(struct super_block *sb, int type, |
ac27a0ec DK |
3117 | const char *data, size_t len, loff_t off) |
3118 | { | |
3119 | struct inode *inode = sb_dqopt(sb)->files[type]; | |
725d26d3 | 3120 | ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb); |
ac27a0ec DK |
3121 | int err = 0; |
3122 | int offset = off & (sb->s_blocksize - 1); | |
3123 | int tocopy; | |
617ba13b | 3124 | int journal_quota = EXT4_SB(sb)->s_qf_names[type] != NULL; |
ac27a0ec DK |
3125 | size_t towrite = len; |
3126 | struct buffer_head *bh; | |
3127 | handle_t *handle = journal_current_handle(); | |
3128 | ||
9c3013e9 JK |
3129 | if (!handle) { |
3130 | printk(KERN_WARNING "EXT4-fs: Quota write (off=%Lu, len=%Lu)" | |
3131 | " cancelled because transaction is not started.\n", | |
3132 | (unsigned long long)off, (unsigned long long)len); | |
3133 | return -EIO; | |
3134 | } | |
ac27a0ec DK |
3135 | mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA); |
3136 | while (towrite > 0) { | |
3137 | tocopy = sb->s_blocksize - offset < towrite ? | |
3138 | sb->s_blocksize - offset : towrite; | |
617ba13b | 3139 | bh = ext4_bread(handle, inode, blk, 1, &err); |
ac27a0ec DK |
3140 | if (!bh) |
3141 | goto out; | |
3142 | if (journal_quota) { | |
617ba13b | 3143 | err = ext4_journal_get_write_access(handle, bh); |
ac27a0ec DK |
3144 | if (err) { |
3145 | brelse(bh); | |
3146 | goto out; | |
3147 | } | |
3148 | } | |
3149 | lock_buffer(bh); | |
3150 | memcpy(bh->b_data+offset, data, tocopy); | |
3151 | flush_dcache_page(bh->b_page); | |
3152 | unlock_buffer(bh); | |
3153 | if (journal_quota) | |
617ba13b | 3154 | err = ext4_journal_dirty_metadata(handle, bh); |
ac27a0ec DK |
3155 | else { |
3156 | /* Always do at least ordered writes for quotas */ | |
617ba13b | 3157 | err = ext4_journal_dirty_data(handle, bh); |
ac27a0ec DK |
3158 | mark_buffer_dirty(bh); |
3159 | } | |
3160 | brelse(bh); | |
3161 | if (err) | |
3162 | goto out; | |
3163 | offset = 0; | |
3164 | towrite -= tocopy; | |
3165 | data += tocopy; | |
3166 | blk++; | |
3167 | } | |
3168 | out: | |
3169 | if (len == towrite) | |
3170 | return err; | |
3171 | if (inode->i_size < off+len-towrite) { | |
3172 | i_size_write(inode, off+len-towrite); | |
617ba13b | 3173 | EXT4_I(inode)->i_disksize = inode->i_size; |
ac27a0ec DK |
3174 | } |
3175 | inode->i_version++; | |
3176 | inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
617ba13b | 3177 | ext4_mark_inode_dirty(handle, inode); |
ac27a0ec DK |
3178 | mutex_unlock(&inode->i_mutex); |
3179 | return len - towrite; | |
3180 | } | |
3181 | ||
3182 | #endif | |
3183 | ||
617ba13b | 3184 | static int ext4_get_sb(struct file_system_type *fs_type, |
ac27a0ec DK |
3185 | int flags, const char *dev_name, void *data, struct vfsmount *mnt) |
3186 | { | |
617ba13b | 3187 | return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super, mnt); |
ac27a0ec DK |
3188 | } |
3189 | ||
617ba13b | 3190 | static struct file_system_type ext4dev_fs_type = { |
ac27a0ec | 3191 | .owner = THIS_MODULE, |
617ba13b MC |
3192 | .name = "ext4dev", |
3193 | .get_sb = ext4_get_sb, | |
ac27a0ec DK |
3194 | .kill_sb = kill_block_super, |
3195 | .fs_flags = FS_REQUIRES_DEV, | |
3196 | }; | |
3197 | ||
617ba13b | 3198 | static int __init init_ext4_fs(void) |
ac27a0ec | 3199 | { |
617ba13b | 3200 | int err = init_ext4_xattr(); |
ac27a0ec DK |
3201 | if (err) |
3202 | return err; | |
3203 | err = init_inodecache(); | |
3204 | if (err) | |
3205 | goto out1; | |
63f57933 | 3206 | err = register_filesystem(&ext4dev_fs_type); |
ac27a0ec DK |
3207 | if (err) |
3208 | goto out; | |
3209 | return 0; | |
3210 | out: | |
3211 | destroy_inodecache(); | |
3212 | out1: | |
617ba13b | 3213 | exit_ext4_xattr(); |
ac27a0ec DK |
3214 | return err; |
3215 | } | |
3216 | ||
617ba13b | 3217 | static void __exit exit_ext4_fs(void) |
ac27a0ec | 3218 | { |
617ba13b | 3219 | unregister_filesystem(&ext4dev_fs_type); |
ac27a0ec | 3220 | destroy_inodecache(); |
617ba13b | 3221 | exit_ext4_xattr(); |
ac27a0ec DK |
3222 | } |
3223 | ||
3224 | MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others"); | |
617ba13b | 3225 | MODULE_DESCRIPTION("Fourth Extended Filesystem with extents"); |
ac27a0ec | 3226 | MODULE_LICENSE("GPL"); |
617ba13b MC |
3227 | module_init(init_ext4_fs) |
3228 | module_exit(exit_ext4_fs) |