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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> |
ac27a0ec DK |
24 | #include <linux/slab.h> |
25 | #include <linux/init.h> | |
26 | #include <linux/blkdev.h> | |
27 | #include <linux/parser.h> | |
28 | #include <linux/smp_lock.h> | |
29 | #include <linux/buffer_head.h> | |
a5694255 | 30 | #include <linux/exportfs.h> |
ac27a0ec DK |
31 | #include <linux/vfs.h> |
32 | #include <linux/random.h> | |
33 | #include <linux/mount.h> | |
34 | #include <linux/namei.h> | |
35 | #include <linux/quotaops.h> | |
36 | #include <linux/seq_file.h> | |
9f6200bb | 37 | #include <linux/proc_fs.h> |
1330593e | 38 | #include <linux/log2.h> |
717d50e4 | 39 | #include <linux/crc16.h> |
ac27a0ec DK |
40 | #include <asm/uaccess.h> |
41 | ||
3dcf5451 CH |
42 | #include "ext4.h" |
43 | #include "ext4_jbd2.h" | |
ac27a0ec DK |
44 | #include "xattr.h" |
45 | #include "acl.h" | |
46 | #include "namei.h" | |
717d50e4 | 47 | #include "group.h" |
ac27a0ec | 48 | |
9f6200bb TT |
49 | struct proc_dir_entry *ext4_proc_root; |
50 | ||
617ba13b | 51 | static int ext4_load_journal(struct super_block *, struct ext4_super_block *, |
ac27a0ec | 52 | unsigned long journal_devnum); |
617ba13b | 53 | static int ext4_create_journal(struct super_block *, struct ext4_super_block *, |
ac27a0ec | 54 | unsigned int); |
2b2d6d01 TT |
55 | static void ext4_commit_super(struct super_block *sb, |
56 | struct ext4_super_block *es, int sync); | |
57 | static void ext4_mark_recovery_complete(struct super_block *sb, | |
58 | struct ext4_super_block *es); | |
59 | static void ext4_clear_journal_err(struct super_block *sb, | |
60 | struct ext4_super_block *es); | |
617ba13b | 61 | static int ext4_sync_fs(struct super_block *sb, int wait); |
2b2d6d01 | 62 | static const char *ext4_decode_error(struct super_block *sb, int errno, |
ac27a0ec | 63 | char nbuf[16]); |
2b2d6d01 TT |
64 | static int ext4_remount(struct super_block *sb, int *flags, char *data); |
65 | static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf); | |
617ba13b | 66 | static void ext4_unlockfs(struct super_block *sb); |
2b2d6d01 | 67 | static void ext4_write_super(struct super_block *sb); |
617ba13b | 68 | static void ext4_write_super_lockfs(struct super_block *sb); |
ac27a0ec | 69 | |
bd81d8ee | 70 | |
8fadc143 AR |
71 | ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, |
72 | struct ext4_group_desc *bg) | |
bd81d8ee | 73 | { |
3a14589c | 74 | return le32_to_cpu(bg->bg_block_bitmap_lo) | |
8fadc143 | 75 | (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? |
3a14589c | 76 | (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0); |
bd81d8ee LV |
77 | } |
78 | ||
8fadc143 AR |
79 | ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, |
80 | struct ext4_group_desc *bg) | |
bd81d8ee | 81 | { |
5272f837 | 82 | return le32_to_cpu(bg->bg_inode_bitmap_lo) | |
8fadc143 | 83 | (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? |
5272f837 | 84 | (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0); |
bd81d8ee LV |
85 | } |
86 | ||
8fadc143 AR |
87 | ext4_fsblk_t ext4_inode_table(struct super_block *sb, |
88 | struct ext4_group_desc *bg) | |
bd81d8ee | 89 | { |
5272f837 | 90 | return le32_to_cpu(bg->bg_inode_table_lo) | |
8fadc143 | 91 | (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? |
5272f837 | 92 | (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0); |
bd81d8ee LV |
93 | } |
94 | ||
8fadc143 AR |
95 | void ext4_block_bitmap_set(struct super_block *sb, |
96 | struct ext4_group_desc *bg, ext4_fsblk_t blk) | |
bd81d8ee | 97 | { |
3a14589c | 98 | bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk); |
8fadc143 AR |
99 | if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) |
100 | bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32); | |
bd81d8ee LV |
101 | } |
102 | ||
8fadc143 AR |
103 | void ext4_inode_bitmap_set(struct super_block *sb, |
104 | struct ext4_group_desc *bg, ext4_fsblk_t blk) | |
bd81d8ee | 105 | { |
5272f837 | 106 | bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk); |
8fadc143 AR |
107 | if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) |
108 | bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32); | |
bd81d8ee LV |
109 | } |
110 | ||
8fadc143 AR |
111 | void ext4_inode_table_set(struct super_block *sb, |
112 | struct ext4_group_desc *bg, ext4_fsblk_t blk) | |
bd81d8ee | 113 | { |
5272f837 | 114 | bg->bg_inode_table_lo = cpu_to_le32((u32)blk); |
8fadc143 AR |
115 | if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) |
116 | bg->bg_inode_table_hi = cpu_to_le32(blk >> 32); | |
bd81d8ee LV |
117 | } |
118 | ||
ac27a0ec | 119 | /* |
dab291af | 120 | * Wrappers for jbd2_journal_start/end. |
ac27a0ec DK |
121 | * |
122 | * The only special thing we need to do here is to make sure that all | |
123 | * journal_end calls result in the superblock being marked dirty, so | |
124 | * that sync() will call the filesystem's write_super callback if | |
125 | * appropriate. | |
126 | */ | |
617ba13b | 127 | handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks) |
ac27a0ec DK |
128 | { |
129 | journal_t *journal; | |
130 | ||
131 | if (sb->s_flags & MS_RDONLY) | |
132 | return ERR_PTR(-EROFS); | |
133 | ||
134 | /* Special case here: if the journal has aborted behind our | |
135 | * backs (eg. EIO in the commit thread), then we still need to | |
136 | * take the FS itself readonly cleanly. */ | |
617ba13b | 137 | journal = EXT4_SB(sb)->s_journal; |
ac27a0ec | 138 | if (is_journal_aborted(journal)) { |
46e665e9 | 139 | ext4_abort(sb, __func__, |
ac27a0ec DK |
140 | "Detected aborted journal"); |
141 | return ERR_PTR(-EROFS); | |
142 | } | |
143 | ||
dab291af | 144 | return jbd2_journal_start(journal, nblocks); |
ac27a0ec DK |
145 | } |
146 | ||
147 | /* | |
148 | * The only special thing we need to do here is to make sure that all | |
dab291af | 149 | * jbd2_journal_stop calls result in the superblock being marked dirty, so |
ac27a0ec DK |
150 | * that sync() will call the filesystem's write_super callback if |
151 | * appropriate. | |
152 | */ | |
617ba13b | 153 | int __ext4_journal_stop(const char *where, handle_t *handle) |
ac27a0ec DK |
154 | { |
155 | struct super_block *sb; | |
156 | int err; | |
157 | int rc; | |
158 | ||
159 | sb = handle->h_transaction->t_journal->j_private; | |
160 | err = handle->h_err; | |
dab291af | 161 | rc = jbd2_journal_stop(handle); |
ac27a0ec DK |
162 | |
163 | if (!err) | |
164 | err = rc; | |
165 | if (err) | |
617ba13b | 166 | __ext4_std_error(sb, where, err); |
ac27a0ec DK |
167 | return err; |
168 | } | |
169 | ||
617ba13b | 170 | void ext4_journal_abort_handle(const char *caller, const char *err_fn, |
ac27a0ec DK |
171 | struct buffer_head *bh, handle_t *handle, int err) |
172 | { | |
173 | char nbuf[16]; | |
617ba13b | 174 | const char *errstr = ext4_decode_error(NULL, err, nbuf); |
ac27a0ec DK |
175 | |
176 | if (bh) | |
177 | BUFFER_TRACE(bh, "abort"); | |
178 | ||
179 | if (!handle->h_err) | |
180 | handle->h_err = err; | |
181 | ||
182 | if (is_handle_aborted(handle)) | |
183 | return; | |
184 | ||
185 | printk(KERN_ERR "%s: aborting transaction: %s in %s\n", | |
186 | caller, errstr, err_fn); | |
187 | ||
dab291af | 188 | jbd2_journal_abort_handle(handle); |
ac27a0ec DK |
189 | } |
190 | ||
191 | /* Deal with the reporting of failure conditions on a filesystem such as | |
192 | * inconsistencies detected or read IO failures. | |
193 | * | |
194 | * On ext2, we can store the error state of the filesystem in the | |
617ba13b | 195 | * superblock. That is not possible on ext4, because we may have other |
ac27a0ec DK |
196 | * write ordering constraints on the superblock which prevent us from |
197 | * writing it out straight away; and given that the journal is about to | |
198 | * be aborted, we can't rely on the current, or future, transactions to | |
199 | * write out the superblock safely. | |
200 | * | |
dab291af | 201 | * We'll just use the jbd2_journal_abort() error code to record an error in |
ac27a0ec DK |
202 | * the journal instead. On recovery, the journal will compain about |
203 | * that error until we've noted it down and cleared it. | |
204 | */ | |
205 | ||
617ba13b | 206 | static void ext4_handle_error(struct super_block *sb) |
ac27a0ec | 207 | { |
617ba13b | 208 | struct ext4_super_block *es = EXT4_SB(sb)->s_es; |
ac27a0ec | 209 | |
617ba13b MC |
210 | EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; |
211 | es->s_state |= cpu_to_le16(EXT4_ERROR_FS); | |
ac27a0ec DK |
212 | |
213 | if (sb->s_flags & MS_RDONLY) | |
214 | return; | |
215 | ||
2b2d6d01 | 216 | if (!test_opt(sb, ERRORS_CONT)) { |
617ba13b | 217 | journal_t *journal = EXT4_SB(sb)->s_journal; |
ac27a0ec | 218 | |
617ba13b | 219 | EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT; |
ac27a0ec | 220 | if (journal) |
dab291af | 221 | jbd2_journal_abort(journal, -EIO); |
ac27a0ec | 222 | } |
2b2d6d01 TT |
223 | if (test_opt(sb, ERRORS_RO)) { |
224 | printk(KERN_CRIT "Remounting filesystem read-only\n"); | |
ac27a0ec DK |
225 | sb->s_flags |= MS_RDONLY; |
226 | } | |
617ba13b | 227 | ext4_commit_super(sb, es, 1); |
ac27a0ec | 228 | if (test_opt(sb, ERRORS_PANIC)) |
617ba13b | 229 | panic("EXT4-fs (device %s): panic forced after error\n", |
ac27a0ec DK |
230 | sb->s_id); |
231 | } | |
232 | ||
2b2d6d01 TT |
233 | void ext4_error(struct super_block *sb, const char *function, |
234 | const char *fmt, ...) | |
ac27a0ec DK |
235 | { |
236 | va_list args; | |
237 | ||
238 | va_start(args, fmt); | |
2b2d6d01 | 239 | printk(KERN_CRIT "EXT4-fs error (device %s): %s: ", sb->s_id, function); |
ac27a0ec DK |
240 | vprintk(fmt, args); |
241 | printk("\n"); | |
242 | va_end(args); | |
243 | ||
617ba13b | 244 | ext4_handle_error(sb); |
ac27a0ec DK |
245 | } |
246 | ||
2b2d6d01 | 247 | static const char *ext4_decode_error(struct super_block *sb, int errno, |
ac27a0ec DK |
248 | char nbuf[16]) |
249 | { | |
250 | char *errstr = NULL; | |
251 | ||
252 | switch (errno) { | |
253 | case -EIO: | |
254 | errstr = "IO failure"; | |
255 | break; | |
256 | case -ENOMEM: | |
257 | errstr = "Out of memory"; | |
258 | break; | |
259 | case -EROFS: | |
dab291af | 260 | if (!sb || EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT) |
ac27a0ec DK |
261 | errstr = "Journal has aborted"; |
262 | else | |
263 | errstr = "Readonly filesystem"; | |
264 | break; | |
265 | default: | |
266 | /* If the caller passed in an extra buffer for unknown | |
267 | * errors, textualise them now. Else we just return | |
268 | * NULL. */ | |
269 | if (nbuf) { | |
270 | /* Check for truncated error codes... */ | |
271 | if (snprintf(nbuf, 16, "error %d", -errno) >= 0) | |
272 | errstr = nbuf; | |
273 | } | |
274 | break; | |
275 | } | |
276 | ||
277 | return errstr; | |
278 | } | |
279 | ||
617ba13b | 280 | /* __ext4_std_error decodes expected errors from journaling functions |
ac27a0ec DK |
281 | * automatically and invokes the appropriate error response. */ |
282 | ||
2b2d6d01 | 283 | void __ext4_std_error(struct super_block *sb, const char *function, int errno) |
ac27a0ec DK |
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 | 295 | errstr = ext4_decode_error(sb, errno, nbuf); |
2b2d6d01 TT |
296 | printk(KERN_CRIT "EXT4-fs error (device %s) in %s: %s\n", |
297 | sb->s_id, function, errstr); | |
ac27a0ec | 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 | ||
2b2d6d01 TT |
312 | void ext4_abort(struct super_block *sb, const char *function, |
313 | const char *fmt, ...) | |
ac27a0ec DK |
314 | { |
315 | va_list args; | |
316 | ||
2b2d6d01 | 317 | printk(KERN_CRIT "ext4_abort called.\n"); |
ac27a0ec DK |
318 | |
319 | va_start(args, fmt); | |
2b2d6d01 | 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 | ||
2b2d6d01 TT |
338 | void ext4_warning(struct super_block *sb, const char *function, |
339 | const char *fmt, ...) | |
ac27a0ec DK |
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 | ||
46e665e9 | 358 | ext4_warning(sb, __func__, |
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 | ||
2b2d6d01 | 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 | ||
c9de560d | 506 | ext4_mb_release(sb); |
a86c6181 | 507 | ext4_ext_release(sb); |
617ba13b | 508 | ext4_xattr_put_super(sb); |
dab291af | 509 | jbd2_journal_destroy(sbi->s_journal); |
47b4a50b | 510 | sbi->s_journal = NULL; |
ac27a0ec | 511 | if (!(sb->s_flags & MS_RDONLY)) { |
617ba13b | 512 | EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); |
ac27a0ec DK |
513 | es->s_state = cpu_to_le16(sbi->s_mount_state); |
514 | BUFFER_TRACE(sbi->s_sbh, "marking dirty"); | |
515 | mark_buffer_dirty(sbi->s_sbh); | |
617ba13b | 516 | ext4_commit_super(sb, es, 1); |
ac27a0ec | 517 | } |
240799cd TT |
518 | if (sbi->s_proc) { |
519 | remove_proc_entry("inode_readahead_blks", sbi->s_proc); | |
9f6200bb | 520 | remove_proc_entry(sb->s_id, ext4_proc_root); |
240799cd | 521 | } |
ac27a0ec DK |
522 | |
523 | for (i = 0; i < sbi->s_gdb_count; i++) | |
524 | brelse(sbi->s_group_desc[i]); | |
525 | kfree(sbi->s_group_desc); | |
772cb7c8 | 526 | kfree(sbi->s_flex_groups); |
ac27a0ec DK |
527 | percpu_counter_destroy(&sbi->s_freeblocks_counter); |
528 | percpu_counter_destroy(&sbi->s_freeinodes_counter); | |
529 | percpu_counter_destroy(&sbi->s_dirs_counter); | |
6bc6e63f | 530 | percpu_counter_destroy(&sbi->s_dirtyblocks_counter); |
ac27a0ec DK |
531 | brelse(sbi->s_sbh); |
532 | #ifdef CONFIG_QUOTA | |
533 | for (i = 0; i < MAXQUOTAS; i++) | |
534 | kfree(sbi->s_qf_names[i]); | |
535 | #endif | |
536 | ||
537 | /* Debugging code just in case the in-memory inode orphan list | |
538 | * isn't empty. The on-disk one can be non-empty if we've | |
539 | * detected an error and taken the fs readonly, but the | |
540 | * in-memory list had better be clean by this point. */ | |
541 | if (!list_empty(&sbi->s_orphan)) | |
542 | dump_orphan_list(sb, sbi); | |
543 | J_ASSERT(list_empty(&sbi->s_orphan)); | |
544 | ||
f98393a6 | 545 | invalidate_bdev(sb->s_bdev); |
ac27a0ec DK |
546 | if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) { |
547 | /* | |
548 | * Invalidate the journal device's buffers. We don't want them | |
549 | * floating about in memory - the physical journal device may | |
550 | * hotswapped, and it breaks the `ro-after' testing code. | |
551 | */ | |
552 | sync_blockdev(sbi->journal_bdev); | |
f98393a6 | 553 | invalidate_bdev(sbi->journal_bdev); |
617ba13b | 554 | ext4_blkdev_remove(sbi); |
ac27a0ec DK |
555 | } |
556 | sb->s_fs_info = NULL; | |
557 | kfree(sbi); | |
558 | return; | |
559 | } | |
560 | ||
e18b890b | 561 | static struct kmem_cache *ext4_inode_cachep; |
ac27a0ec DK |
562 | |
563 | /* | |
564 | * Called inside transaction, so use GFP_NOFS | |
565 | */ | |
617ba13b | 566 | static struct inode *ext4_alloc_inode(struct super_block *sb) |
ac27a0ec | 567 | { |
617ba13b | 568 | struct ext4_inode_info *ei; |
ac27a0ec | 569 | |
e6b4f8da | 570 | ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS); |
ac27a0ec DK |
571 | if (!ei) |
572 | return NULL; | |
617ba13b MC |
573 | #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL |
574 | ei->i_acl = EXT4_ACL_NOT_CACHED; | |
575 | ei->i_default_acl = EXT4_ACL_NOT_CACHED; | |
ac27a0ec DK |
576 | #endif |
577 | ei->i_block_alloc_info = NULL; | |
578 | ei->vfs_inode.i_version = 1; | |
91246c00 | 579 | ei->vfs_inode.i_data.writeback_index = 0; |
a86c6181 | 580 | memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache)); |
c9de560d AT |
581 | INIT_LIST_HEAD(&ei->i_prealloc_list); |
582 | spin_lock_init(&ei->i_prealloc_lock); | |
678aaf48 | 583 | jbd2_journal_init_jbd_inode(&ei->jinode, &ei->vfs_inode); |
d2a17637 MC |
584 | ei->i_reserved_data_blocks = 0; |
585 | ei->i_reserved_meta_blocks = 0; | |
586 | ei->i_allocated_meta_blocks = 0; | |
587 | ei->i_delalloc_reserved_flag = 0; | |
588 | spin_lock_init(&(ei->i_block_reservation_lock)); | |
ac27a0ec DK |
589 | return &ei->vfs_inode; |
590 | } | |
591 | ||
617ba13b | 592 | static void ext4_destroy_inode(struct inode *inode) |
ac27a0ec | 593 | { |
9f7dd93d VA |
594 | if (!list_empty(&(EXT4_I(inode)->i_orphan))) { |
595 | printk("EXT4 Inode %p: orphan list check failed!\n", | |
596 | EXT4_I(inode)); | |
597 | print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4, | |
598 | EXT4_I(inode), sizeof(struct ext4_inode_info), | |
599 | true); | |
600 | dump_stack(); | |
601 | } | |
617ba13b | 602 | kmem_cache_free(ext4_inode_cachep, EXT4_I(inode)); |
ac27a0ec DK |
603 | } |
604 | ||
51cc5068 | 605 | static void init_once(void *foo) |
ac27a0ec | 606 | { |
617ba13b | 607 | struct ext4_inode_info *ei = (struct ext4_inode_info *) foo; |
ac27a0ec | 608 | |
a35afb83 | 609 | INIT_LIST_HEAD(&ei->i_orphan); |
617ba13b | 610 | #ifdef CONFIG_EXT4DEV_FS_XATTR |
a35afb83 | 611 | init_rwsem(&ei->xattr_sem); |
ac27a0ec | 612 | #endif |
0e855ac8 | 613 | init_rwsem(&ei->i_data_sem); |
a35afb83 | 614 | inode_init_once(&ei->vfs_inode); |
ac27a0ec DK |
615 | } |
616 | ||
617 | static int init_inodecache(void) | |
618 | { | |
617ba13b MC |
619 | ext4_inode_cachep = kmem_cache_create("ext4_inode_cache", |
620 | sizeof(struct ext4_inode_info), | |
ac27a0ec DK |
621 | 0, (SLAB_RECLAIM_ACCOUNT| |
622 | SLAB_MEM_SPREAD), | |
20c2df83 | 623 | init_once); |
617ba13b | 624 | if (ext4_inode_cachep == NULL) |
ac27a0ec DK |
625 | return -ENOMEM; |
626 | return 0; | |
627 | } | |
628 | ||
629 | static void destroy_inodecache(void) | |
630 | { | |
617ba13b | 631 | kmem_cache_destroy(ext4_inode_cachep); |
ac27a0ec DK |
632 | } |
633 | ||
617ba13b | 634 | static void ext4_clear_inode(struct inode *inode) |
ac27a0ec | 635 | { |
617ba13b MC |
636 | struct ext4_block_alloc_info *rsv = EXT4_I(inode)->i_block_alloc_info; |
637 | #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL | |
638 | if (EXT4_I(inode)->i_acl && | |
639 | EXT4_I(inode)->i_acl != EXT4_ACL_NOT_CACHED) { | |
640 | posix_acl_release(EXT4_I(inode)->i_acl); | |
641 | EXT4_I(inode)->i_acl = EXT4_ACL_NOT_CACHED; | |
642 | } | |
643 | if (EXT4_I(inode)->i_default_acl && | |
644 | EXT4_I(inode)->i_default_acl != EXT4_ACL_NOT_CACHED) { | |
645 | posix_acl_release(EXT4_I(inode)->i_default_acl); | |
646 | EXT4_I(inode)->i_default_acl = EXT4_ACL_NOT_CACHED; | |
ac27a0ec DK |
647 | } |
648 | #endif | |
617ba13b MC |
649 | ext4_discard_reservation(inode); |
650 | EXT4_I(inode)->i_block_alloc_info = NULL; | |
ac27a0ec DK |
651 | if (unlikely(rsv)) |
652 | kfree(rsv); | |
678aaf48 JK |
653 | jbd2_journal_release_jbd_inode(EXT4_SB(inode->i_sb)->s_journal, |
654 | &EXT4_I(inode)->jinode); | |
ac27a0ec DK |
655 | } |
656 | ||
2b2d6d01 TT |
657 | static inline void ext4_show_quota_options(struct seq_file *seq, |
658 | struct super_block *sb) | |
ac27a0ec DK |
659 | { |
660 | #if defined(CONFIG_QUOTA) | |
617ba13b | 661 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
ac27a0ec DK |
662 | |
663 | if (sbi->s_jquota_fmt) | |
664 | seq_printf(seq, ",jqfmt=%s", | |
af5bc92d | 665 | (sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold" : "vfsv0"); |
ac27a0ec DK |
666 | |
667 | if (sbi->s_qf_names[USRQUOTA]) | |
668 | seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]); | |
669 | ||
670 | if (sbi->s_qf_names[GRPQUOTA]) | |
671 | seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]); | |
672 | ||
617ba13b | 673 | if (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA) |
ac27a0ec DK |
674 | seq_puts(seq, ",usrquota"); |
675 | ||
617ba13b | 676 | if (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA) |
ac27a0ec DK |
677 | seq_puts(seq, ",grpquota"); |
678 | #endif | |
679 | } | |
680 | ||
d9c9bef1 MS |
681 | /* |
682 | * Show an option if | |
683 | * - it's set to a non-default value OR | |
684 | * - if the per-sb default is different from the global default | |
685 | */ | |
617ba13b | 686 | static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs) |
ac27a0ec | 687 | { |
aa22df2c AK |
688 | int def_errors; |
689 | unsigned long def_mount_opts; | |
ac27a0ec | 690 | struct super_block *sb = vfs->mnt_sb; |
d9c9bef1 MS |
691 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
692 | struct ext4_super_block *es = sbi->s_es; | |
d9c9bef1 MS |
693 | |
694 | def_mount_opts = le32_to_cpu(es->s_default_mount_opts); | |
aa22df2c | 695 | def_errors = le16_to_cpu(es->s_errors); |
d9c9bef1 MS |
696 | |
697 | if (sbi->s_sb_block != 1) | |
698 | seq_printf(seq, ",sb=%llu", sbi->s_sb_block); | |
699 | if (test_opt(sb, MINIX_DF)) | |
700 | seq_puts(seq, ",minixdf"); | |
aa22df2c | 701 | if (test_opt(sb, GRPID) && !(def_mount_opts & EXT4_DEFM_BSDGROUPS)) |
d9c9bef1 MS |
702 | seq_puts(seq, ",grpid"); |
703 | if (!test_opt(sb, GRPID) && (def_mount_opts & EXT4_DEFM_BSDGROUPS)) | |
704 | seq_puts(seq, ",nogrpid"); | |
705 | if (sbi->s_resuid != EXT4_DEF_RESUID || | |
706 | le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID) { | |
707 | seq_printf(seq, ",resuid=%u", sbi->s_resuid); | |
708 | } | |
709 | if (sbi->s_resgid != EXT4_DEF_RESGID || | |
710 | le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID) { | |
711 | seq_printf(seq, ",resgid=%u", sbi->s_resgid); | |
712 | } | |
bb4f397a | 713 | if (test_opt(sb, ERRORS_RO)) { |
d9c9bef1 | 714 | if (def_errors == EXT4_ERRORS_PANIC || |
bb4f397a AK |
715 | def_errors == EXT4_ERRORS_CONTINUE) { |
716 | seq_puts(seq, ",errors=remount-ro"); | |
d9c9bef1 MS |
717 | } |
718 | } | |
aa22df2c | 719 | if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE) |
bb4f397a | 720 | seq_puts(seq, ",errors=continue"); |
aa22df2c | 721 | if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC) |
d9c9bef1 | 722 | seq_puts(seq, ",errors=panic"); |
aa22df2c | 723 | if (test_opt(sb, NO_UID32) && !(def_mount_opts & EXT4_DEFM_UID16)) |
d9c9bef1 | 724 | seq_puts(seq, ",nouid32"); |
aa22df2c | 725 | if (test_opt(sb, DEBUG) && !(def_mount_opts & EXT4_DEFM_DEBUG)) |
d9c9bef1 MS |
726 | seq_puts(seq, ",debug"); |
727 | if (test_opt(sb, OLDALLOC)) | |
728 | seq_puts(seq, ",oldalloc"); | |
07620f69 | 729 | #ifdef CONFIG_EXT4DEV_FS_XATTR |
aa22df2c AK |
730 | if (test_opt(sb, XATTR_USER) && |
731 | !(def_mount_opts & EXT4_DEFM_XATTR_USER)) | |
d9c9bef1 MS |
732 | seq_puts(seq, ",user_xattr"); |
733 | if (!test_opt(sb, XATTR_USER) && | |
734 | (def_mount_opts & EXT4_DEFM_XATTR_USER)) { | |
735 | seq_puts(seq, ",nouser_xattr"); | |
736 | } | |
737 | #endif | |
07620f69 | 738 | #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL |
aa22df2c | 739 | if (test_opt(sb, POSIX_ACL) && !(def_mount_opts & EXT4_DEFM_ACL)) |
d9c9bef1 MS |
740 | seq_puts(seq, ",acl"); |
741 | if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT4_DEFM_ACL)) | |
742 | seq_puts(seq, ",noacl"); | |
743 | #endif | |
744 | if (!test_opt(sb, RESERVATION)) | |
745 | seq_puts(seq, ",noreservation"); | |
746 | if (sbi->s_commit_interval) { | |
747 | seq_printf(seq, ",commit=%u", | |
748 | (unsigned) (sbi->s_commit_interval / HZ)); | |
749 | } | |
571640ca ES |
750 | /* |
751 | * We're changing the default of barrier mount option, so | |
752 | * let's always display its mount state so it's clear what its | |
753 | * status is. | |
754 | */ | |
755 | seq_puts(seq, ",barrier="); | |
756 | seq_puts(seq, test_opt(sb, BARRIER) ? "1" : "0"); | |
cd0b6a39 TT |
757 | if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) |
758 | seq_puts(seq, ",journal_async_commit"); | |
d9c9bef1 MS |
759 | if (test_opt(sb, NOBH)) |
760 | seq_puts(seq, ",nobh"); | |
761 | if (!test_opt(sb, EXTENTS)) | |
762 | seq_puts(seq, ",noextents"); | |
3dbd0ede AK |
763 | if (!test_opt(sb, MBALLOC)) |
764 | seq_puts(seq, ",nomballoc"); | |
25ec56b5 JNC |
765 | if (test_opt(sb, I_VERSION)) |
766 | seq_puts(seq, ",i_version"); | |
dd919b98 AK |
767 | if (!test_opt(sb, DELALLOC)) |
768 | seq_puts(seq, ",nodelalloc"); | |
769 | ||
ac27a0ec | 770 | |
cb45bbe4 MS |
771 | if (sbi->s_stripe) |
772 | seq_printf(seq, ",stripe=%lu", sbi->s_stripe); | |
aa22df2c AK |
773 | /* |
774 | * journal mode get enabled in different ways | |
775 | * So just print the value even if we didn't specify it | |
776 | */ | |
617ba13b | 777 | if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) |
ac27a0ec | 778 | seq_puts(seq, ",data=journal"); |
617ba13b | 779 | else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) |
ac27a0ec | 780 | seq_puts(seq, ",data=ordered"); |
617ba13b | 781 | else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA) |
ac27a0ec DK |
782 | seq_puts(seq, ",data=writeback"); |
783 | ||
240799cd TT |
784 | if (sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS) |
785 | seq_printf(seq, ",inode_readahead_blks=%u", | |
786 | sbi->s_inode_readahead_blks); | |
787 | ||
617ba13b | 788 | ext4_show_quota_options(seq, sb); |
ac27a0ec DK |
789 | return 0; |
790 | } | |
791 | ||
792 | ||
1b961ac0 CH |
793 | static struct inode *ext4_nfs_get_inode(struct super_block *sb, |
794 | u64 ino, u32 generation) | |
ac27a0ec | 795 | { |
ac27a0ec | 796 | struct inode *inode; |
ac27a0ec | 797 | |
617ba13b | 798 | if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO) |
ac27a0ec | 799 | return ERR_PTR(-ESTALE); |
617ba13b | 800 | if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)) |
ac27a0ec DK |
801 | return ERR_PTR(-ESTALE); |
802 | ||
803 | /* iget isn't really right if the inode is currently unallocated!! | |
804 | * | |
617ba13b | 805 | * ext4_read_inode will return a bad_inode if the inode had been |
ac27a0ec DK |
806 | * deleted, so we should be safe. |
807 | * | |
808 | * Currently we don't know the generation for parent directory, so | |
809 | * a generation of 0 means "accept any" | |
810 | */ | |
1d1fe1ee DH |
811 | inode = ext4_iget(sb, ino); |
812 | if (IS_ERR(inode)) | |
813 | return ERR_CAST(inode); | |
814 | if (generation && inode->i_generation != generation) { | |
ac27a0ec DK |
815 | iput(inode); |
816 | return ERR_PTR(-ESTALE); | |
817 | } | |
1b961ac0 CH |
818 | |
819 | return inode; | |
820 | } | |
821 | ||
822 | static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid, | |
823 | int fh_len, int fh_type) | |
824 | { | |
825 | return generic_fh_to_dentry(sb, fid, fh_len, fh_type, | |
826 | ext4_nfs_get_inode); | |
827 | } | |
828 | ||
829 | static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid, | |
830 | int fh_len, int fh_type) | |
831 | { | |
832 | return generic_fh_to_parent(sb, fid, fh_len, fh_type, | |
833 | ext4_nfs_get_inode); | |
ac27a0ec DK |
834 | } |
835 | ||
836 | #ifdef CONFIG_QUOTA | |
af5bc92d | 837 | #define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group") |
2b2d6d01 | 838 | #define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA)) |
ac27a0ec | 839 | |
617ba13b MC |
840 | static int ext4_dquot_initialize(struct inode *inode, int type); |
841 | static int ext4_dquot_drop(struct inode *inode); | |
842 | static int ext4_write_dquot(struct dquot *dquot); | |
843 | static int ext4_acquire_dquot(struct dquot *dquot); | |
844 | static int ext4_release_dquot(struct dquot *dquot); | |
845 | static int ext4_mark_dquot_dirty(struct dquot *dquot); | |
846 | static int ext4_write_info(struct super_block *sb, int type); | |
6f28e087 JK |
847 | static int ext4_quota_on(struct super_block *sb, int type, int format_id, |
848 | char *path, int remount); | |
617ba13b MC |
849 | static int ext4_quota_on_mount(struct super_block *sb, int type); |
850 | static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data, | |
ac27a0ec | 851 | size_t len, loff_t off); |
617ba13b | 852 | static ssize_t ext4_quota_write(struct super_block *sb, int type, |
ac27a0ec DK |
853 | const char *data, size_t len, loff_t off); |
854 | ||
617ba13b MC |
855 | static struct dquot_operations ext4_quota_operations = { |
856 | .initialize = ext4_dquot_initialize, | |
857 | .drop = ext4_dquot_drop, | |
ac27a0ec DK |
858 | .alloc_space = dquot_alloc_space, |
859 | .alloc_inode = dquot_alloc_inode, | |
860 | .free_space = dquot_free_space, | |
861 | .free_inode = dquot_free_inode, | |
862 | .transfer = dquot_transfer, | |
617ba13b MC |
863 | .write_dquot = ext4_write_dquot, |
864 | .acquire_dquot = ext4_acquire_dquot, | |
865 | .release_dquot = ext4_release_dquot, | |
866 | .mark_dirty = ext4_mark_dquot_dirty, | |
867 | .write_info = ext4_write_info | |
ac27a0ec DK |
868 | }; |
869 | ||
617ba13b MC |
870 | static struct quotactl_ops ext4_qctl_operations = { |
871 | .quota_on = ext4_quota_on, | |
ac27a0ec DK |
872 | .quota_off = vfs_quota_off, |
873 | .quota_sync = vfs_quota_sync, | |
874 | .get_info = vfs_get_dqinfo, | |
875 | .set_info = vfs_set_dqinfo, | |
876 | .get_dqblk = vfs_get_dqblk, | |
877 | .set_dqblk = vfs_set_dqblk | |
878 | }; | |
879 | #endif | |
880 | ||
ee9b6d61 | 881 | static const struct super_operations ext4_sops = { |
617ba13b MC |
882 | .alloc_inode = ext4_alloc_inode, |
883 | .destroy_inode = ext4_destroy_inode, | |
617ba13b MC |
884 | .write_inode = ext4_write_inode, |
885 | .dirty_inode = ext4_dirty_inode, | |
886 | .delete_inode = ext4_delete_inode, | |
887 | .put_super = ext4_put_super, | |
888 | .write_super = ext4_write_super, | |
889 | .sync_fs = ext4_sync_fs, | |
890 | .write_super_lockfs = ext4_write_super_lockfs, | |
891 | .unlockfs = ext4_unlockfs, | |
892 | .statfs = ext4_statfs, | |
893 | .remount_fs = ext4_remount, | |
894 | .clear_inode = ext4_clear_inode, | |
895 | .show_options = ext4_show_options, | |
ac27a0ec | 896 | #ifdef CONFIG_QUOTA |
617ba13b MC |
897 | .quota_read = ext4_quota_read, |
898 | .quota_write = ext4_quota_write, | |
ac27a0ec DK |
899 | #endif |
900 | }; | |
901 | ||
39655164 | 902 | static const struct export_operations ext4_export_ops = { |
1b961ac0 CH |
903 | .fh_to_dentry = ext4_fh_to_dentry, |
904 | .fh_to_parent = ext4_fh_to_parent, | |
617ba13b | 905 | .get_parent = ext4_get_parent, |
ac27a0ec DK |
906 | }; |
907 | ||
908 | enum { | |
909 | Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid, | |
910 | Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro, | |
911 | Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov, | |
912 | Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl, | |
913 | Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh, | |
914 | Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev, | |
818d276c | 915 | Opt_journal_checksum, Opt_journal_async_commit, |
ac27a0ec DK |
916 | Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback, |
917 | Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota, | |
918 | Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota, | |
919 | Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota, | |
25ec56b5 | 920 | Opt_grpquota, Opt_extents, Opt_noextents, Opt_i_version, |
dd919b98 | 921 | Opt_mballoc, Opt_nomballoc, Opt_stripe, Opt_delalloc, Opt_nodelalloc, |
240799cd | 922 | Opt_inode_readahead_blks |
ac27a0ec DK |
923 | }; |
924 | ||
925 | static match_table_t tokens = { | |
926 | {Opt_bsd_df, "bsddf"}, | |
927 | {Opt_minix_df, "minixdf"}, | |
928 | {Opt_grpid, "grpid"}, | |
929 | {Opt_grpid, "bsdgroups"}, | |
930 | {Opt_nogrpid, "nogrpid"}, | |
931 | {Opt_nogrpid, "sysvgroups"}, | |
932 | {Opt_resgid, "resgid=%u"}, | |
933 | {Opt_resuid, "resuid=%u"}, | |
934 | {Opt_sb, "sb=%u"}, | |
935 | {Opt_err_cont, "errors=continue"}, | |
936 | {Opt_err_panic, "errors=panic"}, | |
937 | {Opt_err_ro, "errors=remount-ro"}, | |
938 | {Opt_nouid32, "nouid32"}, | |
939 | {Opt_nocheck, "nocheck"}, | |
940 | {Opt_nocheck, "check=none"}, | |
941 | {Opt_debug, "debug"}, | |
942 | {Opt_oldalloc, "oldalloc"}, | |
943 | {Opt_orlov, "orlov"}, | |
944 | {Opt_user_xattr, "user_xattr"}, | |
945 | {Opt_nouser_xattr, "nouser_xattr"}, | |
946 | {Opt_acl, "acl"}, | |
947 | {Opt_noacl, "noacl"}, | |
948 | {Opt_reservation, "reservation"}, | |
949 | {Opt_noreservation, "noreservation"}, | |
950 | {Opt_noload, "noload"}, | |
951 | {Opt_nobh, "nobh"}, | |
952 | {Opt_bh, "bh"}, | |
953 | {Opt_commit, "commit=%u"}, | |
954 | {Opt_journal_update, "journal=update"}, | |
955 | {Opt_journal_inum, "journal=%u"}, | |
956 | {Opt_journal_dev, "journal_dev=%u"}, | |
818d276c GS |
957 | {Opt_journal_checksum, "journal_checksum"}, |
958 | {Opt_journal_async_commit, "journal_async_commit"}, | |
ac27a0ec DK |
959 | {Opt_abort, "abort"}, |
960 | {Opt_data_journal, "data=journal"}, | |
961 | {Opt_data_ordered, "data=ordered"}, | |
962 | {Opt_data_writeback, "data=writeback"}, | |
963 | {Opt_offusrjquota, "usrjquota="}, | |
964 | {Opt_usrjquota, "usrjquota=%s"}, | |
965 | {Opt_offgrpjquota, "grpjquota="}, | |
966 | {Opt_grpjquota, "grpjquota=%s"}, | |
967 | {Opt_jqfmt_vfsold, "jqfmt=vfsold"}, | |
968 | {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"}, | |
969 | {Opt_grpquota, "grpquota"}, | |
970 | {Opt_noquota, "noquota"}, | |
971 | {Opt_quota, "quota"}, | |
972 | {Opt_usrquota, "usrquota"}, | |
973 | {Opt_barrier, "barrier=%u"}, | |
a86c6181 | 974 | {Opt_extents, "extents"}, |
1e2462f9 | 975 | {Opt_noextents, "noextents"}, |
25ec56b5 | 976 | {Opt_i_version, "i_version"}, |
c9de560d AT |
977 | {Opt_mballoc, "mballoc"}, |
978 | {Opt_nomballoc, "nomballoc"}, | |
979 | {Opt_stripe, "stripe=%u"}, | |
ac27a0ec | 980 | {Opt_resize, "resize"}, |
64769240 | 981 | {Opt_delalloc, "delalloc"}, |
dd919b98 | 982 | {Opt_nodelalloc, "nodelalloc"}, |
240799cd | 983 | {Opt_inode_readahead_blks, "inode_readahead_blks=%u"}, |
f3f12faa | 984 | {Opt_err, NULL}, |
ac27a0ec DK |
985 | }; |
986 | ||
617ba13b | 987 | static ext4_fsblk_t get_sb_block(void **data) |
ac27a0ec | 988 | { |
617ba13b | 989 | ext4_fsblk_t sb_block; |
ac27a0ec DK |
990 | char *options = (char *) *data; |
991 | ||
992 | if (!options || strncmp(options, "sb=", 3) != 0) | |
993 | return 1; /* Default location */ | |
994 | options += 3; | |
617ba13b | 995 | /*todo: use simple_strtoll with >32bit ext4 */ |
ac27a0ec DK |
996 | sb_block = simple_strtoul(options, &options, 0); |
997 | if (*options && *options != ',') { | |
4776004f | 998 | printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n", |
ac27a0ec DK |
999 | (char *) *data); |
1000 | return 1; | |
1001 | } | |
1002 | if (*options == ',') | |
1003 | options++; | |
1004 | *data = (void *) options; | |
1005 | return sb_block; | |
1006 | } | |
1007 | ||
2b2d6d01 TT |
1008 | static int parse_options(char *options, struct super_block *sb, |
1009 | unsigned int *inum, unsigned long *journal_devnum, | |
1010 | ext4_fsblk_t *n_blocks_count, int is_remount) | |
ac27a0ec | 1011 | { |
617ba13b | 1012 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
2b2d6d01 | 1013 | char *p; |
ac27a0ec DK |
1014 | substring_t args[MAX_OPT_ARGS]; |
1015 | int data_opt = 0; | |
1016 | int option; | |
1017 | #ifdef CONFIG_QUOTA | |
dfc5d03f | 1018 | int qtype, qfmt; |
ac27a0ec DK |
1019 | char *qname; |
1020 | #endif | |
c07651b5 | 1021 | ext4_fsblk_t last_block; |
ac27a0ec DK |
1022 | |
1023 | if (!options) | |
1024 | return 1; | |
1025 | ||
2b2d6d01 | 1026 | while ((p = strsep(&options, ",")) != NULL) { |
ac27a0ec DK |
1027 | int token; |
1028 | if (!*p) | |
1029 | continue; | |
1030 | ||
1031 | token = match_token(p, tokens, args); | |
1032 | switch (token) { | |
1033 | case Opt_bsd_df: | |
2b2d6d01 | 1034 | clear_opt(sbi->s_mount_opt, MINIX_DF); |
ac27a0ec DK |
1035 | break; |
1036 | case Opt_minix_df: | |
2b2d6d01 | 1037 | set_opt(sbi->s_mount_opt, MINIX_DF); |
ac27a0ec DK |
1038 | break; |
1039 | case Opt_grpid: | |
2b2d6d01 | 1040 | set_opt(sbi->s_mount_opt, GRPID); |
ac27a0ec DK |
1041 | break; |
1042 | case Opt_nogrpid: | |
2b2d6d01 | 1043 | clear_opt(sbi->s_mount_opt, GRPID); |
ac27a0ec DK |
1044 | break; |
1045 | case Opt_resuid: | |
1046 | if (match_int(&args[0], &option)) | |
1047 | return 0; | |
1048 | sbi->s_resuid = option; | |
1049 | break; | |
1050 | case Opt_resgid: | |
1051 | if (match_int(&args[0], &option)) | |
1052 | return 0; | |
1053 | sbi->s_resgid = option; | |
1054 | break; | |
1055 | case Opt_sb: | |
1056 | /* handled by get_sb_block() instead of here */ | |
1057 | /* *sb_block = match_int(&args[0]); */ | |
1058 | break; | |
1059 | case Opt_err_panic: | |
2b2d6d01 TT |
1060 | clear_opt(sbi->s_mount_opt, ERRORS_CONT); |
1061 | clear_opt(sbi->s_mount_opt, ERRORS_RO); | |
1062 | set_opt(sbi->s_mount_opt, ERRORS_PANIC); | |
ac27a0ec DK |
1063 | break; |
1064 | case Opt_err_ro: | |
2b2d6d01 TT |
1065 | clear_opt(sbi->s_mount_opt, ERRORS_CONT); |
1066 | clear_opt(sbi->s_mount_opt, ERRORS_PANIC); | |
1067 | set_opt(sbi->s_mount_opt, ERRORS_RO); | |
ac27a0ec DK |
1068 | break; |
1069 | case Opt_err_cont: | |
2b2d6d01 TT |
1070 | clear_opt(sbi->s_mount_opt, ERRORS_RO); |
1071 | clear_opt(sbi->s_mount_opt, ERRORS_PANIC); | |
1072 | set_opt(sbi->s_mount_opt, ERRORS_CONT); | |
ac27a0ec DK |
1073 | break; |
1074 | case Opt_nouid32: | |
2b2d6d01 | 1075 | set_opt(sbi->s_mount_opt, NO_UID32); |
ac27a0ec DK |
1076 | break; |
1077 | case Opt_nocheck: | |
2b2d6d01 | 1078 | clear_opt(sbi->s_mount_opt, CHECK); |
ac27a0ec DK |
1079 | break; |
1080 | case Opt_debug: | |
2b2d6d01 | 1081 | set_opt(sbi->s_mount_opt, DEBUG); |
ac27a0ec DK |
1082 | break; |
1083 | case Opt_oldalloc: | |
2b2d6d01 | 1084 | set_opt(sbi->s_mount_opt, OLDALLOC); |
ac27a0ec DK |
1085 | break; |
1086 | case Opt_orlov: | |
2b2d6d01 | 1087 | clear_opt(sbi->s_mount_opt, OLDALLOC); |
ac27a0ec | 1088 | break; |
617ba13b | 1089 | #ifdef CONFIG_EXT4DEV_FS_XATTR |
ac27a0ec | 1090 | case Opt_user_xattr: |
2b2d6d01 | 1091 | set_opt(sbi->s_mount_opt, XATTR_USER); |
ac27a0ec DK |
1092 | break; |
1093 | case Opt_nouser_xattr: | |
2b2d6d01 | 1094 | clear_opt(sbi->s_mount_opt, XATTR_USER); |
ac27a0ec DK |
1095 | break; |
1096 | #else | |
1097 | case Opt_user_xattr: | |
1098 | case Opt_nouser_xattr: | |
4776004f TT |
1099 | printk(KERN_ERR "EXT4 (no)user_xattr options " |
1100 | "not supported\n"); | |
ac27a0ec DK |
1101 | break; |
1102 | #endif | |
617ba13b | 1103 | #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL |
ac27a0ec DK |
1104 | case Opt_acl: |
1105 | set_opt(sbi->s_mount_opt, POSIX_ACL); | |
1106 | break; | |
1107 | case Opt_noacl: | |
1108 | clear_opt(sbi->s_mount_opt, POSIX_ACL); | |
1109 | break; | |
1110 | #else | |
1111 | case Opt_acl: | |
1112 | case Opt_noacl: | |
4776004f TT |
1113 | printk(KERN_ERR "EXT4 (no)acl options " |
1114 | "not supported\n"); | |
ac27a0ec DK |
1115 | break; |
1116 | #endif | |
1117 | case Opt_reservation: | |
1118 | set_opt(sbi->s_mount_opt, RESERVATION); | |
1119 | break; | |
1120 | case Opt_noreservation: | |
1121 | clear_opt(sbi->s_mount_opt, RESERVATION); | |
1122 | break; | |
1123 | case Opt_journal_update: | |
1124 | /* @@@ FIXME */ | |
1125 | /* Eventually we will want to be able to create | |
1126 | a journal file here. For now, only allow the | |
1127 | user to specify an existing inode to be the | |
1128 | journal file. */ | |
1129 | if (is_remount) { | |
617ba13b | 1130 | printk(KERN_ERR "EXT4-fs: cannot specify " |
ac27a0ec DK |
1131 | "journal on remount\n"); |
1132 | return 0; | |
1133 | } | |
2b2d6d01 | 1134 | set_opt(sbi->s_mount_opt, UPDATE_JOURNAL); |
ac27a0ec DK |
1135 | break; |
1136 | case Opt_journal_inum: | |
1137 | if (is_remount) { | |
617ba13b | 1138 | printk(KERN_ERR "EXT4-fs: cannot specify " |
ac27a0ec DK |
1139 | "journal on remount\n"); |
1140 | return 0; | |
1141 | } | |
1142 | if (match_int(&args[0], &option)) | |
1143 | return 0; | |
1144 | *inum = option; | |
1145 | break; | |
1146 | case Opt_journal_dev: | |
1147 | if (is_remount) { | |
617ba13b | 1148 | printk(KERN_ERR "EXT4-fs: cannot specify " |
ac27a0ec DK |
1149 | "journal on remount\n"); |
1150 | return 0; | |
1151 | } | |
1152 | if (match_int(&args[0], &option)) | |
1153 | return 0; | |
1154 | *journal_devnum = option; | |
1155 | break; | |
818d276c GS |
1156 | case Opt_journal_checksum: |
1157 | set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM); | |
1158 | break; | |
1159 | case Opt_journal_async_commit: | |
1160 | set_opt(sbi->s_mount_opt, JOURNAL_ASYNC_COMMIT); | |
1161 | set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM); | |
1162 | break; | |
ac27a0ec | 1163 | case Opt_noload: |
2b2d6d01 | 1164 | set_opt(sbi->s_mount_opt, NOLOAD); |
ac27a0ec DK |
1165 | break; |
1166 | case Opt_commit: | |
1167 | if (match_int(&args[0], &option)) | |
1168 | return 0; | |
1169 | if (option < 0) | |
1170 | return 0; | |
1171 | if (option == 0) | |
cd02ff0b | 1172 | option = JBD2_DEFAULT_MAX_COMMIT_AGE; |
ac27a0ec DK |
1173 | sbi->s_commit_interval = HZ * option; |
1174 | break; | |
1175 | case Opt_data_journal: | |
617ba13b | 1176 | data_opt = EXT4_MOUNT_JOURNAL_DATA; |
ac27a0ec DK |
1177 | goto datacheck; |
1178 | case Opt_data_ordered: | |
617ba13b | 1179 | data_opt = EXT4_MOUNT_ORDERED_DATA; |
ac27a0ec DK |
1180 | goto datacheck; |
1181 | case Opt_data_writeback: | |
617ba13b | 1182 | data_opt = EXT4_MOUNT_WRITEBACK_DATA; |
ac27a0ec DK |
1183 | datacheck: |
1184 | if (is_remount) { | |
617ba13b | 1185 | if ((sbi->s_mount_opt & EXT4_MOUNT_DATA_FLAGS) |
ac27a0ec DK |
1186 | != data_opt) { |
1187 | printk(KERN_ERR | |
617ba13b | 1188 | "EXT4-fs: cannot change data " |
ac27a0ec DK |
1189 | "mode on remount\n"); |
1190 | return 0; | |
1191 | } | |
1192 | } else { | |
617ba13b | 1193 | sbi->s_mount_opt &= ~EXT4_MOUNT_DATA_FLAGS; |
ac27a0ec DK |
1194 | sbi->s_mount_opt |= data_opt; |
1195 | } | |
1196 | break; | |
1197 | #ifdef CONFIG_QUOTA | |
1198 | case Opt_usrjquota: | |
1199 | qtype = USRQUOTA; | |
1200 | goto set_qf_name; | |
1201 | case Opt_grpjquota: | |
1202 | qtype = GRPQUOTA; | |
1203 | set_qf_name: | |
dfc5d03f JK |
1204 | if ((sb_any_quota_enabled(sb) || |
1205 | sb_any_quota_suspended(sb)) && | |
1206 | !sbi->s_qf_names[qtype]) { | |
ac27a0ec | 1207 | printk(KERN_ERR |
4776004f TT |
1208 | "EXT4-fs: Cannot change journaled " |
1209 | "quota options when quota turned on.\n"); | |
ac27a0ec DK |
1210 | return 0; |
1211 | } | |
1212 | qname = match_strdup(&args[0]); | |
1213 | if (!qname) { | |
1214 | printk(KERN_ERR | |
617ba13b | 1215 | "EXT4-fs: not enough memory for " |
ac27a0ec DK |
1216 | "storing quotafile name.\n"); |
1217 | return 0; | |
1218 | } | |
1219 | if (sbi->s_qf_names[qtype] && | |
1220 | strcmp(sbi->s_qf_names[qtype], qname)) { | |
1221 | printk(KERN_ERR | |
617ba13b | 1222 | "EXT4-fs: %s quota file already " |
ac27a0ec DK |
1223 | "specified.\n", QTYPE2NAME(qtype)); |
1224 | kfree(qname); | |
1225 | return 0; | |
1226 | } | |
1227 | sbi->s_qf_names[qtype] = qname; | |
1228 | if (strchr(sbi->s_qf_names[qtype], '/')) { | |
1229 | printk(KERN_ERR | |
617ba13b | 1230 | "EXT4-fs: quotafile must be on " |
ac27a0ec DK |
1231 | "filesystem root.\n"); |
1232 | kfree(sbi->s_qf_names[qtype]); | |
1233 | sbi->s_qf_names[qtype] = NULL; | |
1234 | return 0; | |
1235 | } | |
1236 | set_opt(sbi->s_mount_opt, QUOTA); | |
1237 | break; | |
1238 | case Opt_offusrjquota: | |
1239 | qtype = USRQUOTA; | |
1240 | goto clear_qf_name; | |
1241 | case Opt_offgrpjquota: | |
1242 | qtype = GRPQUOTA; | |
1243 | clear_qf_name: | |
dfc5d03f JK |
1244 | if ((sb_any_quota_enabled(sb) || |
1245 | sb_any_quota_suspended(sb)) && | |
1246 | sbi->s_qf_names[qtype]) { | |
617ba13b | 1247 | printk(KERN_ERR "EXT4-fs: Cannot change " |
2c8be6b2 | 1248 | "journaled quota options when " |
ac27a0ec DK |
1249 | "quota turned on.\n"); |
1250 | return 0; | |
1251 | } | |
1252 | /* | |
1253 | * The space will be released later when all options | |
1254 | * are confirmed to be correct | |
1255 | */ | |
1256 | sbi->s_qf_names[qtype] = NULL; | |
1257 | break; | |
1258 | case Opt_jqfmt_vfsold: | |
dfc5d03f JK |
1259 | qfmt = QFMT_VFS_OLD; |
1260 | goto set_qf_format; | |
ac27a0ec | 1261 | case Opt_jqfmt_vfsv0: |
dfc5d03f JK |
1262 | qfmt = QFMT_VFS_V0; |
1263 | set_qf_format: | |
1264 | if ((sb_any_quota_enabled(sb) || | |
1265 | sb_any_quota_suspended(sb)) && | |
1266 | sbi->s_jquota_fmt != qfmt) { | |
1267 | printk(KERN_ERR "EXT4-fs: Cannot change " | |
1268 | "journaled quota options when " | |
1269 | "quota turned on.\n"); | |
1270 | return 0; | |
1271 | } | |
1272 | sbi->s_jquota_fmt = qfmt; | |
ac27a0ec DK |
1273 | break; |
1274 | case Opt_quota: | |
1275 | case Opt_usrquota: | |
1276 | set_opt(sbi->s_mount_opt, QUOTA); | |
1277 | set_opt(sbi->s_mount_opt, USRQUOTA); | |
1278 | break; | |
1279 | case Opt_grpquota: | |
1280 | set_opt(sbi->s_mount_opt, QUOTA); | |
1281 | set_opt(sbi->s_mount_opt, GRPQUOTA); | |
1282 | break; | |
1283 | case Opt_noquota: | |
1284 | if (sb_any_quota_enabled(sb)) { | |
617ba13b | 1285 | printk(KERN_ERR "EXT4-fs: Cannot change quota " |
ac27a0ec DK |
1286 | "options when quota turned on.\n"); |
1287 | return 0; | |
1288 | } | |
1289 | clear_opt(sbi->s_mount_opt, QUOTA); | |
1290 | clear_opt(sbi->s_mount_opt, USRQUOTA); | |
1291 | clear_opt(sbi->s_mount_opt, GRPQUOTA); | |
1292 | break; | |
1293 | #else | |
1294 | case Opt_quota: | |
1295 | case Opt_usrquota: | |
1296 | case Opt_grpquota: | |
cd59e7b9 JK |
1297 | printk(KERN_ERR |
1298 | "EXT4-fs: quota options not supported.\n"); | |
1299 | break; | |
ac27a0ec DK |
1300 | case Opt_usrjquota: |
1301 | case Opt_grpjquota: | |
1302 | case Opt_offusrjquota: | |
1303 | case Opt_offgrpjquota: | |
1304 | case Opt_jqfmt_vfsold: | |
1305 | case Opt_jqfmt_vfsv0: | |
1306 | printk(KERN_ERR | |
cd59e7b9 | 1307 | "EXT4-fs: journaled quota options not " |
ac27a0ec DK |
1308 | "supported.\n"); |
1309 | break; | |
1310 | case Opt_noquota: | |
1311 | break; | |
1312 | #endif | |
1313 | case Opt_abort: | |
1314 | set_opt(sbi->s_mount_opt, ABORT); | |
1315 | break; | |
1316 | case Opt_barrier: | |
1317 | if (match_int(&args[0], &option)) | |
1318 | return 0; | |
1319 | if (option) | |
1320 | set_opt(sbi->s_mount_opt, BARRIER); | |
1321 | else | |
1322 | clear_opt(sbi->s_mount_opt, BARRIER); | |
1323 | break; | |
1324 | case Opt_ignore: | |
1325 | break; | |
1326 | case Opt_resize: | |
1327 | if (!is_remount) { | |
617ba13b | 1328 | printk("EXT4-fs: resize option only available " |
ac27a0ec DK |
1329 | "for remount\n"); |
1330 | return 0; | |
1331 | } | |
1332 | if (match_int(&args[0], &option) != 0) | |
1333 | return 0; | |
1334 | *n_blocks_count = option; | |
1335 | break; | |
1336 | case Opt_nobh: | |
1337 | set_opt(sbi->s_mount_opt, NOBH); | |
1338 | break; | |
1339 | case Opt_bh: | |
1340 | clear_opt(sbi->s_mount_opt, NOBH); | |
1341 | break; | |
a86c6181 | 1342 | case Opt_extents: |
e4079a11 ES |
1343 | if (!EXT4_HAS_INCOMPAT_FEATURE(sb, |
1344 | EXT4_FEATURE_INCOMPAT_EXTENTS)) { | |
1345 | ext4_warning(sb, __func__, | |
1346 | "extents feature not enabled " | |
1347 | "on this filesystem, use tune2fs\n"); | |
1348 | return 0; | |
1349 | } | |
2b2d6d01 | 1350 | set_opt(sbi->s_mount_opt, EXTENTS); |
a86c6181 | 1351 | break; |
1e2462f9 | 1352 | case Opt_noextents: |
c07651b5 AK |
1353 | /* |
1354 | * When e2fsprogs support resizing an already existing | |
1355 | * ext3 file system to greater than 2**32 we need to | |
1356 | * add support to block allocator to handle growing | |
1357 | * already existing block mapped inode so that blocks | |
1358 | * allocated for them fall within 2**32 | |
1359 | */ | |
1360 | last_block = ext4_blocks_count(sbi->s_es) - 1; | |
1361 | if (last_block > 0xffffffffULL) { | |
1362 | printk(KERN_ERR "EXT4-fs: Filesystem too " | |
1363 | "large to mount with " | |
1364 | "-o noextents options\n"); | |
1365 | return 0; | |
1366 | } | |
2b2d6d01 | 1367 | clear_opt(sbi->s_mount_opt, EXTENTS); |
1e2462f9 | 1368 | break; |
25ec56b5 JNC |
1369 | case Opt_i_version: |
1370 | set_opt(sbi->s_mount_opt, I_VERSION); | |
1371 | sb->s_flags |= MS_I_VERSION; | |
1372 | break; | |
dd919b98 AK |
1373 | case Opt_nodelalloc: |
1374 | clear_opt(sbi->s_mount_opt, DELALLOC); | |
1375 | break; | |
c9de560d AT |
1376 | case Opt_mballoc: |
1377 | set_opt(sbi->s_mount_opt, MBALLOC); | |
1378 | break; | |
1379 | case Opt_nomballoc: | |
1380 | clear_opt(sbi->s_mount_opt, MBALLOC); | |
1381 | break; | |
1382 | case Opt_stripe: | |
1383 | if (match_int(&args[0], &option)) | |
1384 | return 0; | |
1385 | if (option < 0) | |
1386 | return 0; | |
1387 | sbi->s_stripe = option; | |
1388 | break; | |
64769240 AT |
1389 | case Opt_delalloc: |
1390 | set_opt(sbi->s_mount_opt, DELALLOC); | |
1391 | break; | |
240799cd TT |
1392 | case Opt_inode_readahead_blks: |
1393 | if (match_int(&args[0], &option)) | |
1394 | return 0; | |
1395 | if (option < 0 || option > (1 << 30)) | |
1396 | return 0; | |
1397 | sbi->s_inode_readahead_blks = option; | |
1398 | break; | |
ac27a0ec | 1399 | default: |
2b2d6d01 TT |
1400 | printk(KERN_ERR |
1401 | "EXT4-fs: Unrecognized mount option \"%s\" " | |
1402 | "or missing value\n", p); | |
ac27a0ec DK |
1403 | return 0; |
1404 | } | |
1405 | } | |
1406 | #ifdef CONFIG_QUOTA | |
1407 | if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) { | |
617ba13b | 1408 | if ((sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA) && |
ac27a0ec DK |
1409 | sbi->s_qf_names[USRQUOTA]) |
1410 | clear_opt(sbi->s_mount_opt, USRQUOTA); | |
1411 | ||
617ba13b | 1412 | if ((sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA) && |
ac27a0ec DK |
1413 | sbi->s_qf_names[GRPQUOTA]) |
1414 | clear_opt(sbi->s_mount_opt, GRPQUOTA); | |
1415 | ||
1416 | if ((sbi->s_qf_names[USRQUOTA] && | |
617ba13b | 1417 | (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)) || |
ac27a0ec | 1418 | (sbi->s_qf_names[GRPQUOTA] && |
617ba13b MC |
1419 | (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA))) { |
1420 | printk(KERN_ERR "EXT4-fs: old and new quota " | |
ac27a0ec DK |
1421 | "format mixing.\n"); |
1422 | return 0; | |
1423 | } | |
1424 | ||
1425 | if (!sbi->s_jquota_fmt) { | |
2c8be6b2 | 1426 | printk(KERN_ERR "EXT4-fs: journaled quota format " |
ac27a0ec DK |
1427 | "not specified.\n"); |
1428 | return 0; | |
1429 | } | |
1430 | } else { | |
1431 | if (sbi->s_jquota_fmt) { | |
2c8be6b2 JK |
1432 | printk(KERN_ERR "EXT4-fs: journaled quota format " |
1433 | "specified with no journaling " | |
ac27a0ec DK |
1434 | "enabled.\n"); |
1435 | return 0; | |
1436 | } | |
1437 | } | |
1438 | #endif | |
1439 | return 1; | |
1440 | } | |
1441 | ||
617ba13b | 1442 | static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es, |
ac27a0ec DK |
1443 | int read_only) |
1444 | { | |
617ba13b | 1445 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
ac27a0ec DK |
1446 | int res = 0; |
1447 | ||
617ba13b | 1448 | if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) { |
2b2d6d01 TT |
1449 | printk(KERN_ERR "EXT4-fs warning: revision level too high, " |
1450 | "forcing read-only mode\n"); | |
ac27a0ec DK |
1451 | res = MS_RDONLY; |
1452 | } | |
1453 | if (read_only) | |
1454 | return res; | |
617ba13b | 1455 | if (!(sbi->s_mount_state & EXT4_VALID_FS)) |
2b2d6d01 TT |
1456 | printk(KERN_WARNING "EXT4-fs warning: mounting unchecked fs, " |
1457 | "running e2fsck is recommended\n"); | |
617ba13b | 1458 | else if ((sbi->s_mount_state & EXT4_ERROR_FS)) |
2b2d6d01 TT |
1459 | printk(KERN_WARNING |
1460 | "EXT4-fs warning: mounting fs with errors, " | |
1461 | "running e2fsck is recommended\n"); | |
ac27a0ec DK |
1462 | else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 && |
1463 | le16_to_cpu(es->s_mnt_count) >= | |
1464 | (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count)) | |
2b2d6d01 TT |
1465 | printk(KERN_WARNING |
1466 | "EXT4-fs warning: maximal mount count reached, " | |
1467 | "running e2fsck is recommended\n"); | |
ac27a0ec DK |
1468 | else if (le32_to_cpu(es->s_checkinterval) && |
1469 | (le32_to_cpu(es->s_lastcheck) + | |
1470 | le32_to_cpu(es->s_checkinterval) <= get_seconds())) | |
2b2d6d01 TT |
1471 | printk(KERN_WARNING |
1472 | "EXT4-fs warning: checktime reached, " | |
1473 | "running e2fsck is recommended\n"); | |
ac27a0ec DK |
1474 | #if 0 |
1475 | /* @@@ We _will_ want to clear the valid bit if we find | |
63f57933 AM |
1476 | * inconsistencies, to force a fsck at reboot. But for |
1477 | * a plain journaled filesystem we can keep it set as | |
1478 | * valid forever! :) | |
1479 | */ | |
216c34b2 | 1480 | es->s_state &= cpu_to_le16(~EXT4_VALID_FS); |
ac27a0ec DK |
1481 | #endif |
1482 | if (!(__s16) le16_to_cpu(es->s_max_mnt_count)) | |
617ba13b | 1483 | es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT); |
e8546d06 | 1484 | le16_add_cpu(&es->s_mnt_count, 1); |
ac27a0ec | 1485 | es->s_mtime = cpu_to_le32(get_seconds()); |
617ba13b MC |
1486 | ext4_update_dynamic_rev(sb); |
1487 | EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); | |
ac27a0ec | 1488 | |
617ba13b | 1489 | ext4_commit_super(sb, es, 1); |
ac27a0ec | 1490 | if (test_opt(sb, DEBUG)) |
617ba13b | 1491 | printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%lu, " |
ac27a0ec DK |
1492 | "bpg=%lu, ipg=%lu, mo=%04lx]\n", |
1493 | sb->s_blocksize, | |
1494 | sbi->s_groups_count, | |
617ba13b MC |
1495 | EXT4_BLOCKS_PER_GROUP(sb), |
1496 | EXT4_INODES_PER_GROUP(sb), | |
ac27a0ec DK |
1497 | sbi->s_mount_opt); |
1498 | ||
05496769 TT |
1499 | printk(KERN_INFO "EXT4 FS on %s, %s journal on %s\n", |
1500 | sb->s_id, EXT4_SB(sb)->s_journal->j_inode ? "internal" : | |
1501 | "external", EXT4_SB(sb)->s_journal->j_devname); | |
ac27a0ec DK |
1502 | return res; |
1503 | } | |
1504 | ||
772cb7c8 JS |
1505 | static int ext4_fill_flex_info(struct super_block *sb) |
1506 | { | |
1507 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
1508 | struct ext4_group_desc *gdp = NULL; | |
1509 | struct buffer_head *bh; | |
1510 | ext4_group_t flex_group_count; | |
1511 | ext4_group_t flex_group; | |
1512 | int groups_per_flex = 0; | |
1513 | __u64 block_bitmap = 0; | |
1514 | int i; | |
1515 | ||
1516 | if (!sbi->s_es->s_log_groups_per_flex) { | |
1517 | sbi->s_log_groups_per_flex = 0; | |
1518 | return 1; | |
1519 | } | |
1520 | ||
1521 | sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex; | |
1522 | groups_per_flex = 1 << sbi->s_log_groups_per_flex; | |
1523 | ||
c62a11fd FB |
1524 | /* We allocate both existing and potentially added groups */ |
1525 | flex_group_count = ((sbi->s_groups_count + groups_per_flex - 1) + | |
1526 | ((sbi->s_es->s_reserved_gdt_blocks +1 ) << | |
1527 | EXT4_DESC_PER_BLOCK_BITS(sb))) / | |
1528 | groups_per_flex; | |
ec05e868 | 1529 | sbi->s_flex_groups = kzalloc(flex_group_count * |
772cb7c8 JS |
1530 | sizeof(struct flex_groups), GFP_KERNEL); |
1531 | if (sbi->s_flex_groups == NULL) { | |
ec05e868 LZ |
1532 | printk(KERN_ERR "EXT4-fs: not enough memory for " |
1533 | "%lu flex groups\n", flex_group_count); | |
772cb7c8 JS |
1534 | goto failed; |
1535 | } | |
772cb7c8 JS |
1536 | |
1537 | gdp = ext4_get_group_desc(sb, 1, &bh); | |
1538 | block_bitmap = ext4_block_bitmap(sb, gdp) - 1; | |
1539 | ||
1540 | for (i = 0; i < sbi->s_groups_count; i++) { | |
1541 | gdp = ext4_get_group_desc(sb, i, &bh); | |
1542 | ||
1543 | flex_group = ext4_flex_group(sbi, i); | |
1544 | sbi->s_flex_groups[flex_group].free_inodes += | |
1545 | le16_to_cpu(gdp->bg_free_inodes_count); | |
1546 | sbi->s_flex_groups[flex_group].free_blocks += | |
1547 | le16_to_cpu(gdp->bg_free_blocks_count); | |
1548 | } | |
1549 | ||
1550 | return 1; | |
1551 | failed: | |
1552 | return 0; | |
1553 | } | |
1554 | ||
717d50e4 AD |
1555 | __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group, |
1556 | struct ext4_group_desc *gdp) | |
1557 | { | |
1558 | __u16 crc = 0; | |
1559 | ||
1560 | if (sbi->s_es->s_feature_ro_compat & | |
1561 | cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) { | |
1562 | int offset = offsetof(struct ext4_group_desc, bg_checksum); | |
1563 | __le32 le_group = cpu_to_le32(block_group); | |
1564 | ||
1565 | crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid)); | |
1566 | crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group)); | |
1567 | crc = crc16(crc, (__u8 *)gdp, offset); | |
1568 | offset += sizeof(gdp->bg_checksum); /* skip checksum */ | |
1569 | /* for checksum of struct ext4_group_desc do the rest...*/ | |
1570 | if ((sbi->s_es->s_feature_incompat & | |
1571 | cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) && | |
1572 | offset < le16_to_cpu(sbi->s_es->s_desc_size)) | |
1573 | crc = crc16(crc, (__u8 *)gdp + offset, | |
1574 | le16_to_cpu(sbi->s_es->s_desc_size) - | |
1575 | offset); | |
1576 | } | |
1577 | ||
1578 | return cpu_to_le16(crc); | |
1579 | } | |
1580 | ||
1581 | int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 block_group, | |
1582 | struct ext4_group_desc *gdp) | |
1583 | { | |
1584 | if ((sbi->s_es->s_feature_ro_compat & | |
1585 | cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) && | |
1586 | (gdp->bg_checksum != ext4_group_desc_csum(sbi, block_group, gdp))) | |
1587 | return 0; | |
1588 | ||
1589 | return 1; | |
1590 | } | |
1591 | ||
ac27a0ec | 1592 | /* Called at mount-time, super-block is locked */ |
197cd65a | 1593 | static int ext4_check_descriptors(struct super_block *sb) |
ac27a0ec | 1594 | { |
617ba13b MC |
1595 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
1596 | ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block); | |
1597 | ext4_fsblk_t last_block; | |
bd81d8ee LV |
1598 | ext4_fsblk_t block_bitmap; |
1599 | ext4_fsblk_t inode_bitmap; | |
1600 | ext4_fsblk_t inode_table; | |
ce421581 | 1601 | int flexbg_flag = 0; |
fd2d4291 | 1602 | ext4_group_t i; |
ac27a0ec | 1603 | |
ce421581 JS |
1604 | if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG)) |
1605 | flexbg_flag = 1; | |
1606 | ||
af5bc92d | 1607 | ext4_debug("Checking group descriptors"); |
ac27a0ec | 1608 | |
197cd65a AM |
1609 | for (i = 0; i < sbi->s_groups_count; i++) { |
1610 | struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL); | |
1611 | ||
ce421581 | 1612 | if (i == sbi->s_groups_count - 1 || flexbg_flag) |
bd81d8ee | 1613 | last_block = ext4_blocks_count(sbi->s_es) - 1; |
ac27a0ec DK |
1614 | else |
1615 | last_block = first_block + | |
617ba13b | 1616 | (EXT4_BLOCKS_PER_GROUP(sb) - 1); |
ac27a0ec | 1617 | |
8fadc143 | 1618 | block_bitmap = ext4_block_bitmap(sb, gdp); |
2b2d6d01 | 1619 | if (block_bitmap < first_block || block_bitmap > last_block) { |
c19204b0 JB |
1620 | printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: " |
1621 | "Block bitmap for group %lu not in group " | |
1622 | "(block %llu)!", i, block_bitmap); | |
ac27a0ec DK |
1623 | return 0; |
1624 | } | |
8fadc143 | 1625 | inode_bitmap = ext4_inode_bitmap(sb, gdp); |
2b2d6d01 | 1626 | if (inode_bitmap < first_block || inode_bitmap > last_block) { |
c19204b0 JB |
1627 | printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: " |
1628 | "Inode bitmap for group %lu not in group " | |
1629 | "(block %llu)!", i, inode_bitmap); | |
ac27a0ec DK |
1630 | return 0; |
1631 | } | |
8fadc143 | 1632 | inode_table = ext4_inode_table(sb, gdp); |
bd81d8ee | 1633 | if (inode_table < first_block || |
2b2d6d01 | 1634 | inode_table + sbi->s_itb_per_group - 1 > last_block) { |
c19204b0 JB |
1635 | printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: " |
1636 | "Inode table for group %lu not in group " | |
1637 | "(block %llu)!", i, inode_table); | |
ac27a0ec DK |
1638 | return 0; |
1639 | } | |
b5f10eed | 1640 | spin_lock(sb_bgl_lock(sbi, i)); |
717d50e4 | 1641 | if (!ext4_group_desc_csum_verify(sbi, i, gdp)) { |
c19204b0 JB |
1642 | printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: " |
1643 | "Checksum for group %lu failed (%u!=%u)\n", | |
1644 | i, le16_to_cpu(ext4_group_desc_csum(sbi, i, | |
1645 | gdp)), le16_to_cpu(gdp->bg_checksum)); | |
7ee1ec4c LZ |
1646 | if (!(sb->s_flags & MS_RDONLY)) { |
1647 | spin_unlock(sb_bgl_lock(sbi, i)); | |
8a266467 | 1648 | return 0; |
7ee1ec4c | 1649 | } |
717d50e4 | 1650 | } |
b5f10eed | 1651 | spin_unlock(sb_bgl_lock(sbi, i)); |
ce421581 JS |
1652 | if (!flexbg_flag) |
1653 | first_block += EXT4_BLOCKS_PER_GROUP(sb); | |
ac27a0ec DK |
1654 | } |
1655 | ||
bd81d8ee | 1656 | ext4_free_blocks_count_set(sbi->s_es, ext4_count_free_blocks(sb)); |
2b2d6d01 | 1657 | sbi->s_es->s_free_inodes_count = cpu_to_le32(ext4_count_free_inodes(sb)); |
ac27a0ec DK |
1658 | return 1; |
1659 | } | |
1660 | ||
617ba13b | 1661 | /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at |
ac27a0ec DK |
1662 | * the superblock) which were deleted from all directories, but held open by |
1663 | * a process at the time of a crash. We walk the list and try to delete these | |
1664 | * inodes at recovery time (only with a read-write filesystem). | |
1665 | * | |
1666 | * In order to keep the orphan inode chain consistent during traversal (in | |
1667 | * case of crash during recovery), we link each inode into the superblock | |
1668 | * orphan list_head and handle it the same way as an inode deletion during | |
1669 | * normal operation (which journals the operations for us). | |
1670 | * | |
1671 | * We only do an iget() and an iput() on each inode, which is very safe if we | |
1672 | * accidentally point at an in-use or already deleted inode. The worst that | |
1673 | * can happen in this case is that we get a "bit already cleared" message from | |
617ba13b | 1674 | * ext4_free_inode(). The only reason we would point at a wrong inode is if |
ac27a0ec DK |
1675 | * e2fsck was run on this filesystem, and it must have already done the orphan |
1676 | * inode cleanup for us, so we can safely abort without any further action. | |
1677 | */ | |
2b2d6d01 TT |
1678 | static void ext4_orphan_cleanup(struct super_block *sb, |
1679 | struct ext4_super_block *es) | |
ac27a0ec DK |
1680 | { |
1681 | unsigned int s_flags = sb->s_flags; | |
1682 | int nr_orphans = 0, nr_truncates = 0; | |
1683 | #ifdef CONFIG_QUOTA | |
1684 | int i; | |
1685 | #endif | |
1686 | if (!es->s_last_orphan) { | |
1687 | jbd_debug(4, "no orphan inodes to clean up\n"); | |
1688 | return; | |
1689 | } | |
1690 | ||
a8f48a95 ES |
1691 | if (bdev_read_only(sb->s_bdev)) { |
1692 | printk(KERN_ERR "EXT4-fs: write access " | |
1693 | "unavailable, skipping orphan cleanup.\n"); | |
1694 | return; | |
1695 | } | |
1696 | ||
617ba13b | 1697 | if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) { |
ac27a0ec DK |
1698 | if (es->s_last_orphan) |
1699 | jbd_debug(1, "Errors on filesystem, " | |
1700 | "clearing orphan list.\n"); | |
1701 | es->s_last_orphan = 0; | |
1702 | jbd_debug(1, "Skipping orphan recovery on fs with errors.\n"); | |
1703 | return; | |
1704 | } | |
1705 | ||
1706 | if (s_flags & MS_RDONLY) { | |
617ba13b | 1707 | printk(KERN_INFO "EXT4-fs: %s: orphan cleanup on readonly fs\n", |
ac27a0ec DK |
1708 | sb->s_id); |
1709 | sb->s_flags &= ~MS_RDONLY; | |
1710 | } | |
1711 | #ifdef CONFIG_QUOTA | |
1712 | /* Needed for iput() to work correctly and not trash data */ | |
1713 | sb->s_flags |= MS_ACTIVE; | |
1714 | /* Turn on quotas so that they are updated correctly */ | |
1715 | for (i = 0; i < MAXQUOTAS; i++) { | |
617ba13b MC |
1716 | if (EXT4_SB(sb)->s_qf_names[i]) { |
1717 | int ret = ext4_quota_on_mount(sb, i); | |
ac27a0ec DK |
1718 | if (ret < 0) |
1719 | printk(KERN_ERR | |
2c8be6b2 | 1720 | "EXT4-fs: Cannot turn on journaled " |
ac27a0ec DK |
1721 | "quota: error %d\n", ret); |
1722 | } | |
1723 | } | |
1724 | #endif | |
1725 | ||
1726 | while (es->s_last_orphan) { | |
1727 | struct inode *inode; | |
1728 | ||
97bd42b9 JB |
1729 | inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan)); |
1730 | if (IS_ERR(inode)) { | |
ac27a0ec DK |
1731 | es->s_last_orphan = 0; |
1732 | break; | |
1733 | } | |
1734 | ||
617ba13b | 1735 | list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan); |
ac27a0ec DK |
1736 | DQUOT_INIT(inode); |
1737 | if (inode->i_nlink) { | |
1738 | printk(KERN_DEBUG | |
e5f8eab8 | 1739 | "%s: truncating inode %lu to %lld bytes\n", |
46e665e9 | 1740 | __func__, inode->i_ino, inode->i_size); |
e5f8eab8 | 1741 | jbd_debug(2, "truncating inode %lu to %lld bytes\n", |
ac27a0ec | 1742 | inode->i_ino, inode->i_size); |
617ba13b | 1743 | ext4_truncate(inode); |
ac27a0ec DK |
1744 | nr_truncates++; |
1745 | } else { | |
1746 | printk(KERN_DEBUG | |
1747 | "%s: deleting unreferenced inode %lu\n", | |
46e665e9 | 1748 | __func__, inode->i_ino); |
ac27a0ec DK |
1749 | jbd_debug(2, "deleting unreferenced inode %lu\n", |
1750 | inode->i_ino); | |
1751 | nr_orphans++; | |
1752 | } | |
1753 | iput(inode); /* The delete magic happens here! */ | |
1754 | } | |
1755 | ||
2b2d6d01 | 1756 | #define PLURAL(x) (x), ((x) == 1) ? "" : "s" |
ac27a0ec DK |
1757 | |
1758 | if (nr_orphans) | |
617ba13b | 1759 | printk(KERN_INFO "EXT4-fs: %s: %d orphan inode%s deleted\n", |
ac27a0ec DK |
1760 | sb->s_id, PLURAL(nr_orphans)); |
1761 | if (nr_truncates) | |
617ba13b | 1762 | printk(KERN_INFO "EXT4-fs: %s: %d truncate%s cleaned up\n", |
ac27a0ec DK |
1763 | sb->s_id, PLURAL(nr_truncates)); |
1764 | #ifdef CONFIG_QUOTA | |
1765 | /* Turn quotas off */ | |
1766 | for (i = 0; i < MAXQUOTAS; i++) { | |
1767 | if (sb_dqopt(sb)->files[i]) | |
6f28e087 | 1768 | vfs_quota_off(sb, i, 0); |
ac27a0ec DK |
1769 | } |
1770 | #endif | |
1771 | sb->s_flags = s_flags; /* Restore MS_RDONLY status */ | |
1772 | } | |
cd2291a4 ES |
1773 | /* |
1774 | * Maximal extent format file size. | |
1775 | * Resulting logical blkno at s_maxbytes must fit in our on-disk | |
1776 | * extent format containers, within a sector_t, and within i_blocks | |
1777 | * in the vfs. ext4 inode has 48 bits of i_block in fsblock units, | |
1778 | * so that won't be a limiting factor. | |
1779 | * | |
1780 | * Note, this does *not* consider any metadata overhead for vfs i_blocks. | |
1781 | */ | |
1782 | static loff_t ext4_max_size(int blkbits) | |
1783 | { | |
1784 | loff_t res; | |
1785 | loff_t upper_limit = MAX_LFS_FILESIZE; | |
1786 | ||
1787 | /* small i_blocks in vfs inode? */ | |
1788 | if (sizeof(blkcnt_t) < sizeof(u64)) { | |
1789 | /* | |
1790 | * CONFIG_LSF is not enabled implies the inode | |
1791 | * i_block represent total blocks in 512 bytes | |
1792 | * 32 == size of vfs inode i_blocks * 8 | |
1793 | */ | |
1794 | upper_limit = (1LL << 32) - 1; | |
1795 | ||
1796 | /* total blocks in file system block size */ | |
1797 | upper_limit >>= (blkbits - 9); | |
1798 | upper_limit <<= blkbits; | |
1799 | } | |
1800 | ||
1801 | /* 32-bit extent-start container, ee_block */ | |
1802 | res = 1LL << 32; | |
1803 | res <<= blkbits; | |
1804 | res -= 1; | |
1805 | ||
1806 | /* Sanity check against vm- & vfs- imposed limits */ | |
1807 | if (res > upper_limit) | |
1808 | res = upper_limit; | |
1809 | ||
1810 | return res; | |
1811 | } | |
ac27a0ec | 1812 | |
ac27a0ec | 1813 | /* |
cd2291a4 | 1814 | * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect |
0fc1b451 AK |
1815 | * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks. |
1816 | * We need to be 1 filesystem block less than the 2^48 sector limit. | |
ac27a0ec | 1817 | */ |
cd2291a4 | 1818 | static loff_t ext4_max_bitmap_size(int bits) |
ac27a0ec | 1819 | { |
617ba13b | 1820 | loff_t res = EXT4_NDIR_BLOCKS; |
0fc1b451 AK |
1821 | int meta_blocks; |
1822 | loff_t upper_limit; | |
1823 | /* This is calculated to be the largest file size for a | |
cd2291a4 | 1824 | * dense, bitmapped file such that the total number of |
ac27a0ec | 1825 | * sectors in the file, including data and all indirect blocks, |
0fc1b451 AK |
1826 | * does not exceed 2^48 -1 |
1827 | * __u32 i_blocks_lo and _u16 i_blocks_high representing the | |
1828 | * total number of 512 bytes blocks of the file | |
1829 | */ | |
1830 | ||
1831 | if (sizeof(blkcnt_t) < sizeof(u64)) { | |
1832 | /* | |
1833 | * CONFIG_LSF is not enabled implies the inode | |
1834 | * i_block represent total blocks in 512 bytes | |
1835 | * 32 == size of vfs inode i_blocks * 8 | |
1836 | */ | |
1837 | upper_limit = (1LL << 32) - 1; | |
1838 | ||
1839 | /* total blocks in file system block size */ | |
1840 | upper_limit >>= (bits - 9); | |
1841 | ||
1842 | } else { | |
8180a562 AK |
1843 | /* |
1844 | * We use 48 bit ext4_inode i_blocks | |
1845 | * With EXT4_HUGE_FILE_FL set the i_blocks | |
1846 | * represent total number of blocks in | |
1847 | * file system block size | |
1848 | */ | |
0fc1b451 AK |
1849 | upper_limit = (1LL << 48) - 1; |
1850 | ||
0fc1b451 AK |
1851 | } |
1852 | ||
1853 | /* indirect blocks */ | |
1854 | meta_blocks = 1; | |
1855 | /* double indirect blocks */ | |
1856 | meta_blocks += 1 + (1LL << (bits-2)); | |
1857 | /* tripple indirect blocks */ | |
1858 | meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2))); | |
1859 | ||
1860 | upper_limit -= meta_blocks; | |
1861 | upper_limit <<= bits; | |
ac27a0ec DK |
1862 | |
1863 | res += 1LL << (bits-2); | |
1864 | res += 1LL << (2*(bits-2)); | |
1865 | res += 1LL << (3*(bits-2)); | |
1866 | res <<= bits; | |
1867 | if (res > upper_limit) | |
1868 | res = upper_limit; | |
0fc1b451 AK |
1869 | |
1870 | if (res > MAX_LFS_FILESIZE) | |
1871 | res = MAX_LFS_FILESIZE; | |
1872 | ||
ac27a0ec DK |
1873 | return res; |
1874 | } | |
1875 | ||
617ba13b | 1876 | static ext4_fsblk_t descriptor_loc(struct super_block *sb, |
70bbb3e0 | 1877 | ext4_fsblk_t logical_sb_block, int nr) |
ac27a0ec | 1878 | { |
617ba13b | 1879 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
fd2d4291 | 1880 | ext4_group_t bg, first_meta_bg; |
ac27a0ec DK |
1881 | int has_super = 0; |
1882 | ||
1883 | first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg); | |
1884 | ||
617ba13b | 1885 | if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) || |
ac27a0ec | 1886 | nr < first_meta_bg) |
70bbb3e0 | 1887 | return logical_sb_block + nr + 1; |
ac27a0ec | 1888 | bg = sbi->s_desc_per_block * nr; |
617ba13b | 1889 | if (ext4_bg_has_super(sb, bg)) |
ac27a0ec | 1890 | has_super = 1; |
617ba13b | 1891 | return (has_super + ext4_group_first_block_no(sb, bg)); |
ac27a0ec DK |
1892 | } |
1893 | ||
c9de560d AT |
1894 | /** |
1895 | * ext4_get_stripe_size: Get the stripe size. | |
1896 | * @sbi: In memory super block info | |
1897 | * | |
1898 | * If we have specified it via mount option, then | |
1899 | * use the mount option value. If the value specified at mount time is | |
1900 | * greater than the blocks per group use the super block value. | |
1901 | * If the super block value is greater than blocks per group return 0. | |
1902 | * Allocator needs it be less than blocks per group. | |
1903 | * | |
1904 | */ | |
1905 | static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi) | |
1906 | { | |
1907 | unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride); | |
1908 | unsigned long stripe_width = | |
1909 | le32_to_cpu(sbi->s_es->s_raid_stripe_width); | |
1910 | ||
1911 | if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group) | |
1912 | return sbi->s_stripe; | |
1913 | ||
1914 | if (stripe_width <= sbi->s_blocks_per_group) | |
1915 | return stripe_width; | |
1916 | ||
1917 | if (stride <= sbi->s_blocks_per_group) | |
1918 | return stride; | |
1919 | ||
1920 | return 0; | |
1921 | } | |
ac27a0ec | 1922 | |
2b2d6d01 | 1923 | static int ext4_fill_super(struct super_block *sb, void *data, int silent) |
7477827f AK |
1924 | __releases(kernel_lock) |
1925 | __acquires(kernel_lock) | |
1d03ec98 | 1926 | |
ac27a0ec | 1927 | { |
2b2d6d01 | 1928 | struct buffer_head *bh; |
617ba13b MC |
1929 | struct ext4_super_block *es = NULL; |
1930 | struct ext4_sb_info *sbi; | |
1931 | ext4_fsblk_t block; | |
1932 | ext4_fsblk_t sb_block = get_sb_block(&data); | |
70bbb3e0 | 1933 | ext4_fsblk_t logical_sb_block; |
ac27a0ec DK |
1934 | unsigned long offset = 0; |
1935 | unsigned int journal_inum = 0; | |
1936 | unsigned long journal_devnum = 0; | |
1937 | unsigned long def_mount_opts; | |
1938 | struct inode *root; | |
9f6200bb | 1939 | char *cp; |
1d1fe1ee | 1940 | int ret = -EINVAL; |
ac27a0ec | 1941 | int blocksize; |
ac27a0ec DK |
1942 | int db_count; |
1943 | int i; | |
1944 | int needs_recovery; | |
1945 | __le32 features; | |
bd81d8ee | 1946 | __u64 blocks_count; |
833f4077 | 1947 | int err; |
ac27a0ec DK |
1948 | |
1949 | sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); | |
1950 | if (!sbi) | |
1951 | return -ENOMEM; | |
1952 | sb->s_fs_info = sbi; | |
1953 | sbi->s_mount_opt = 0; | |
617ba13b MC |
1954 | sbi->s_resuid = EXT4_DEF_RESUID; |
1955 | sbi->s_resgid = EXT4_DEF_RESGID; | |
240799cd | 1956 | sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS; |
d9c9bef1 | 1957 | sbi->s_sb_block = sb_block; |
ac27a0ec DK |
1958 | |
1959 | unlock_kernel(); | |
1960 | ||
9f6200bb TT |
1961 | /* Cleanup superblock name */ |
1962 | for (cp = sb->s_id; (cp = strchr(cp, '/'));) | |
1963 | *cp = '!'; | |
1964 | ||
617ba13b | 1965 | blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE); |
ac27a0ec | 1966 | if (!blocksize) { |
617ba13b | 1967 | printk(KERN_ERR "EXT4-fs: unable to set blocksize\n"); |
ac27a0ec DK |
1968 | goto out_fail; |
1969 | } | |
1970 | ||
1971 | /* | |
617ba13b | 1972 | * The ext4 superblock will not be buffer aligned for other than 1kB |
ac27a0ec DK |
1973 | * block sizes. We need to calculate the offset from buffer start. |
1974 | */ | |
617ba13b | 1975 | if (blocksize != EXT4_MIN_BLOCK_SIZE) { |
70bbb3e0 AM |
1976 | logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE; |
1977 | offset = do_div(logical_sb_block, blocksize); | |
ac27a0ec | 1978 | } else { |
70bbb3e0 | 1979 | logical_sb_block = sb_block; |
ac27a0ec DK |
1980 | } |
1981 | ||
70bbb3e0 | 1982 | if (!(bh = sb_bread(sb, logical_sb_block))) { |
2b2d6d01 | 1983 | printk(KERN_ERR "EXT4-fs: unable to read superblock\n"); |
ac27a0ec DK |
1984 | goto out_fail; |
1985 | } | |
1986 | /* | |
1987 | * Note: s_es must be initialized as soon as possible because | |
617ba13b | 1988 | * some ext4 macro-instructions depend on its value |
ac27a0ec | 1989 | */ |
617ba13b | 1990 | es = (struct ext4_super_block *) (((char *)bh->b_data) + offset); |
ac27a0ec DK |
1991 | sbi->s_es = es; |
1992 | sb->s_magic = le16_to_cpu(es->s_magic); | |
617ba13b MC |
1993 | if (sb->s_magic != EXT4_SUPER_MAGIC) |
1994 | goto cantfind_ext4; | |
ac27a0ec DK |
1995 | |
1996 | /* Set defaults before we parse the mount options */ | |
1997 | def_mount_opts = le32_to_cpu(es->s_default_mount_opts); | |
617ba13b | 1998 | if (def_mount_opts & EXT4_DEFM_DEBUG) |
ac27a0ec | 1999 | set_opt(sbi->s_mount_opt, DEBUG); |
617ba13b | 2000 | if (def_mount_opts & EXT4_DEFM_BSDGROUPS) |
ac27a0ec | 2001 | set_opt(sbi->s_mount_opt, GRPID); |
617ba13b | 2002 | if (def_mount_opts & EXT4_DEFM_UID16) |
ac27a0ec | 2003 | set_opt(sbi->s_mount_opt, NO_UID32); |
2e7842b8 | 2004 | #ifdef CONFIG_EXT4DEV_FS_XATTR |
617ba13b | 2005 | if (def_mount_opts & EXT4_DEFM_XATTR_USER) |
ac27a0ec | 2006 | set_opt(sbi->s_mount_opt, XATTR_USER); |
2e7842b8 HD |
2007 | #endif |
2008 | #ifdef CONFIG_EXT4DEV_FS_POSIX_ACL | |
617ba13b | 2009 | if (def_mount_opts & EXT4_DEFM_ACL) |
ac27a0ec | 2010 | set_opt(sbi->s_mount_opt, POSIX_ACL); |
2e7842b8 | 2011 | #endif |
617ba13b MC |
2012 | if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA) |
2013 | sbi->s_mount_opt |= EXT4_MOUNT_JOURNAL_DATA; | |
2014 | else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED) | |
2015 | sbi->s_mount_opt |= EXT4_MOUNT_ORDERED_DATA; | |
2016 | else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK) | |
2017 | sbi->s_mount_opt |= EXT4_MOUNT_WRITEBACK_DATA; | |
2018 | ||
2019 | if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC) | |
ac27a0ec | 2020 | set_opt(sbi->s_mount_opt, ERRORS_PANIC); |
bb4f397a | 2021 | else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE) |
ceea16bf | 2022 | set_opt(sbi->s_mount_opt, ERRORS_CONT); |
bb4f397a AK |
2023 | else |
2024 | set_opt(sbi->s_mount_opt, ERRORS_RO); | |
ac27a0ec DK |
2025 | |
2026 | sbi->s_resuid = le16_to_cpu(es->s_def_resuid); | |
2027 | sbi->s_resgid = le16_to_cpu(es->s_def_resgid); | |
2028 | ||
2029 | set_opt(sbi->s_mount_opt, RESERVATION); | |
571640ca | 2030 | set_opt(sbi->s_mount_opt, BARRIER); |
ac27a0ec | 2031 | |
1e2462f9 MC |
2032 | /* |
2033 | * turn on extents feature by default in ext4 filesystem | |
e4079a11 ES |
2034 | * only if feature flag already set by mkfs or tune2fs. |
2035 | * Use -o noextents to turn it off | |
1e2462f9 | 2036 | */ |
e4079a11 ES |
2037 | if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS)) |
2038 | set_opt(sbi->s_mount_opt, EXTENTS); | |
2039 | else | |
2040 | ext4_warning(sb, __func__, | |
2041 | "extents feature not enabled on this filesystem, " | |
2042 | "use tune2fs.\n"); | |
3dbd0ede | 2043 | /* |
e4079a11 ES |
2044 | * turn on mballoc code by default in ext4 filesystem |
2045 | * Use -o nomballoc to turn it off | |
3dbd0ede AK |
2046 | */ |
2047 | set_opt(sbi->s_mount_opt, MBALLOC); | |
1e2462f9 | 2048 | |
dd919b98 AK |
2049 | /* |
2050 | * enable delayed allocation by default | |
2051 | * Use -o nodelalloc to turn it off | |
2052 | */ | |
2053 | set_opt(sbi->s_mount_opt, DELALLOC); | |
2054 | ||
2055 | ||
2b2d6d01 TT |
2056 | if (!parse_options((char *) data, sb, &journal_inum, &journal_devnum, |
2057 | NULL, 0)) | |
ac27a0ec DK |
2058 | goto failed_mount; |
2059 | ||
2060 | sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | | |
617ba13b | 2061 | ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0); |
ac27a0ec | 2062 | |
617ba13b MC |
2063 | if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV && |
2064 | (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) || | |
2065 | EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) || | |
2066 | EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U))) | |
ac27a0ec | 2067 | printk(KERN_WARNING |
617ba13b | 2068 | "EXT4-fs warning: feature flags set on rev 0 fs, " |
ac27a0ec | 2069 | "running e2fsck is recommended\n"); |
469108ff TT |
2070 | |
2071 | /* | |
2072 | * Since ext4 is still considered development code, we require | |
2073 | * that the TEST_FILESYS flag in s->flags be set. | |
2074 | */ | |
2075 | if (!(le32_to_cpu(es->s_flags) & EXT2_FLAGS_TEST_FILESYS)) { | |
2076 | printk(KERN_WARNING "EXT4-fs: %s: not marked " | |
2077 | "OK to use with test code.\n", sb->s_id); | |
2078 | goto failed_mount; | |
2079 | } | |
2080 | ||
ac27a0ec DK |
2081 | /* |
2082 | * Check feature flags regardless of the revision level, since we | |
2083 | * previously didn't change the revision level when setting the flags, | |
2084 | * so there is a chance incompat flags are set on a rev 0 filesystem. | |
2085 | */ | |
617ba13b | 2086 | features = EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP); |
ac27a0ec | 2087 | if (features) { |
617ba13b | 2088 | printk(KERN_ERR "EXT4-fs: %s: couldn't mount because of " |
ac27a0ec DK |
2089 | "unsupported optional features (%x).\n", |
2090 | sb->s_id, le32_to_cpu(features)); | |
2091 | goto failed_mount; | |
2092 | } | |
617ba13b | 2093 | features = EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP); |
ac27a0ec | 2094 | if (!(sb->s_flags & MS_RDONLY) && features) { |
617ba13b | 2095 | printk(KERN_ERR "EXT4-fs: %s: couldn't mount RDWR because of " |
ac27a0ec DK |
2096 | "unsupported optional features (%x).\n", |
2097 | sb->s_id, le32_to_cpu(features)); | |
2098 | goto failed_mount; | |
2099 | } | |
0fc1b451 AK |
2100 | if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) { |
2101 | /* | |
2102 | * Large file size enabled file system can only be | |
2103 | * mount if kernel is build with CONFIG_LSF | |
2104 | */ | |
2105 | if (sizeof(root->i_blocks) < sizeof(u64) && | |
2106 | !(sb->s_flags & MS_RDONLY)) { | |
2107 | printk(KERN_ERR "EXT4-fs: %s: Filesystem with huge " | |
2108 | "files cannot be mounted read-write " | |
2109 | "without CONFIG_LSF.\n", sb->s_id); | |
2110 | goto failed_mount; | |
2111 | } | |
2112 | } | |
ac27a0ec DK |
2113 | blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size); |
2114 | ||
617ba13b MC |
2115 | if (blocksize < EXT4_MIN_BLOCK_SIZE || |
2116 | blocksize > EXT4_MAX_BLOCK_SIZE) { | |
ac27a0ec | 2117 | printk(KERN_ERR |
617ba13b | 2118 | "EXT4-fs: Unsupported filesystem blocksize %d on %s.\n", |
ac27a0ec DK |
2119 | blocksize, sb->s_id); |
2120 | goto failed_mount; | |
2121 | } | |
2122 | ||
ac27a0ec | 2123 | if (sb->s_blocksize != blocksize) { |
ce40733c AK |
2124 | |
2125 | /* Validate the filesystem blocksize */ | |
2126 | if (!sb_set_blocksize(sb, blocksize)) { | |
2127 | printk(KERN_ERR "EXT4-fs: bad block size %d.\n", | |
2128 | blocksize); | |
ac27a0ec DK |
2129 | goto failed_mount; |
2130 | } | |
2131 | ||
2b2d6d01 | 2132 | brelse(bh); |
70bbb3e0 AM |
2133 | logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE; |
2134 | offset = do_div(logical_sb_block, blocksize); | |
2135 | bh = sb_bread(sb, logical_sb_block); | |
ac27a0ec DK |
2136 | if (!bh) { |
2137 | printk(KERN_ERR | |
617ba13b | 2138 | "EXT4-fs: Can't read superblock on 2nd try.\n"); |
ac27a0ec DK |
2139 | goto failed_mount; |
2140 | } | |
617ba13b | 2141 | es = (struct ext4_super_block *)(((char *)bh->b_data) + offset); |
ac27a0ec | 2142 | sbi->s_es = es; |
617ba13b | 2143 | if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) { |
2b2d6d01 TT |
2144 | printk(KERN_ERR |
2145 | "EXT4-fs: Magic mismatch, very weird !\n"); | |
ac27a0ec DK |
2146 | goto failed_mount; |
2147 | } | |
2148 | } | |
2149 | ||
e2b46574 | 2150 | sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits); |
617ba13b | 2151 | sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits); |
ac27a0ec | 2152 | |
617ba13b MC |
2153 | if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) { |
2154 | sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE; | |
2155 | sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO; | |
ac27a0ec DK |
2156 | } else { |
2157 | sbi->s_inode_size = le16_to_cpu(es->s_inode_size); | |
2158 | sbi->s_first_ino = le32_to_cpu(es->s_first_ino); | |
617ba13b | 2159 | if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) || |
1330593e | 2160 | (!is_power_of_2(sbi->s_inode_size)) || |
ac27a0ec | 2161 | (sbi->s_inode_size > blocksize)) { |
2b2d6d01 TT |
2162 | printk(KERN_ERR |
2163 | "EXT4-fs: unsupported inode size: %d\n", | |
2164 | sbi->s_inode_size); | |
ac27a0ec DK |
2165 | goto failed_mount; |
2166 | } | |
ef7f3835 KS |
2167 | if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) |
2168 | sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2); | |
ac27a0ec | 2169 | } |
0d1ee42f AR |
2170 | sbi->s_desc_size = le16_to_cpu(es->s_desc_size); |
2171 | if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) { | |
8fadc143 | 2172 | if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT || |
0d1ee42f | 2173 | sbi->s_desc_size > EXT4_MAX_DESC_SIZE || |
d8ea6cf8 | 2174 | !is_power_of_2(sbi->s_desc_size)) { |
0d1ee42f | 2175 | printk(KERN_ERR |
8fadc143 | 2176 | "EXT4-fs: unsupported descriptor size %lu\n", |
0d1ee42f AR |
2177 | sbi->s_desc_size); |
2178 | goto failed_mount; | |
2179 | } | |
2180 | } else | |
2181 | sbi->s_desc_size = EXT4_MIN_DESC_SIZE; | |
ac27a0ec | 2182 | sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group); |
ac27a0ec | 2183 | sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group); |
b47b6f38 | 2184 | if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0) |
617ba13b MC |
2185 | goto cantfind_ext4; |
2186 | sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb); | |
ac27a0ec | 2187 | if (sbi->s_inodes_per_block == 0) |
617ba13b | 2188 | goto cantfind_ext4; |
ac27a0ec DK |
2189 | sbi->s_itb_per_group = sbi->s_inodes_per_group / |
2190 | sbi->s_inodes_per_block; | |
0d1ee42f | 2191 | sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb); |
ac27a0ec DK |
2192 | sbi->s_sbh = bh; |
2193 | sbi->s_mount_state = le16_to_cpu(es->s_state); | |
e57aa839 FW |
2194 | sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb)); |
2195 | sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb)); | |
2b2d6d01 | 2196 | for (i = 0; i < 4; i++) |
ac27a0ec DK |
2197 | sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]); |
2198 | sbi->s_def_hash_version = es->s_def_hash_version; | |
2199 | ||
2200 | if (sbi->s_blocks_per_group > blocksize * 8) { | |
2b2d6d01 TT |
2201 | printk(KERN_ERR |
2202 | "EXT4-fs: #blocks per group too big: %lu\n", | |
2203 | sbi->s_blocks_per_group); | |
ac27a0ec DK |
2204 | goto failed_mount; |
2205 | } | |
ac27a0ec | 2206 | if (sbi->s_inodes_per_group > blocksize * 8) { |
2b2d6d01 TT |
2207 | printk(KERN_ERR |
2208 | "EXT4-fs: #inodes per group too big: %lu\n", | |
2209 | sbi->s_inodes_per_group); | |
ac27a0ec DK |
2210 | goto failed_mount; |
2211 | } | |
2212 | ||
bd81d8ee | 2213 | if (ext4_blocks_count(es) > |
ac27a0ec | 2214 | (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) { |
617ba13b | 2215 | printk(KERN_ERR "EXT4-fs: filesystem on %s:" |
ac27a0ec DK |
2216 | " too large to mount safely\n", sb->s_id); |
2217 | if (sizeof(sector_t) < 8) | |
617ba13b | 2218 | printk(KERN_WARNING "EXT4-fs: CONFIG_LBD not " |
ac27a0ec DK |
2219 | "enabled\n"); |
2220 | goto failed_mount; | |
2221 | } | |
2222 | ||
617ba13b MC |
2223 | if (EXT4_BLOCKS_PER_GROUP(sb) == 0) |
2224 | goto cantfind_ext4; | |
e7c95593 ES |
2225 | |
2226 | /* ensure blocks_count calculation below doesn't sign-extend */ | |
2227 | if (ext4_blocks_count(es) + EXT4_BLOCKS_PER_GROUP(sb) < | |
2228 | le32_to_cpu(es->s_first_data_block) + 1) { | |
2229 | printk(KERN_WARNING "EXT4-fs: bad geometry: block count %llu, " | |
2230 | "first data block %u, blocks per group %lu\n", | |
2231 | ext4_blocks_count(es), | |
2232 | le32_to_cpu(es->s_first_data_block), | |
2233 | EXT4_BLOCKS_PER_GROUP(sb)); | |
2234 | goto failed_mount; | |
2235 | } | |
bd81d8ee LV |
2236 | blocks_count = (ext4_blocks_count(es) - |
2237 | le32_to_cpu(es->s_first_data_block) + | |
2238 | EXT4_BLOCKS_PER_GROUP(sb) - 1); | |
2239 | do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb)); | |
2240 | sbi->s_groups_count = blocks_count; | |
617ba13b MC |
2241 | db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) / |
2242 | EXT4_DESC_PER_BLOCK(sb); | |
2b2d6d01 | 2243 | sbi->s_group_desc = kmalloc(db_count * sizeof(struct buffer_head *), |
ac27a0ec DK |
2244 | GFP_KERNEL); |
2245 | if (sbi->s_group_desc == NULL) { | |
2b2d6d01 | 2246 | printk(KERN_ERR "EXT4-fs: not enough memory\n"); |
ac27a0ec DK |
2247 | goto failed_mount; |
2248 | } | |
2249 | ||
9f6200bb TT |
2250 | if (ext4_proc_root) |
2251 | sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root); | |
2252 | ||
240799cd TT |
2253 | if (sbi->s_proc) |
2254 | proc_create_data("inode_readahead_blks", 0644, sbi->s_proc, | |
2255 | &ext4_ui_proc_fops, | |
2256 | &sbi->s_inode_readahead_blks); | |
2257 | ||
ac27a0ec DK |
2258 | bgl_lock_init(&sbi->s_blockgroup_lock); |
2259 | ||
2260 | for (i = 0; i < db_count; i++) { | |
70bbb3e0 | 2261 | block = descriptor_loc(sb, logical_sb_block, i); |
ac27a0ec DK |
2262 | sbi->s_group_desc[i] = sb_bread(sb, block); |
2263 | if (!sbi->s_group_desc[i]) { | |
2b2d6d01 TT |
2264 | printk(KERN_ERR "EXT4-fs: " |
2265 | "can't read group descriptor %d\n", i); | |
ac27a0ec DK |
2266 | db_count = i; |
2267 | goto failed_mount2; | |
2268 | } | |
2269 | } | |
2b2d6d01 | 2270 | if (!ext4_check_descriptors(sb)) { |
617ba13b | 2271 | printk(KERN_ERR "EXT4-fs: group descriptors corrupted!\n"); |
ac27a0ec DK |
2272 | goto failed_mount2; |
2273 | } | |
772cb7c8 JS |
2274 | if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG)) |
2275 | if (!ext4_fill_flex_info(sb)) { | |
2276 | printk(KERN_ERR | |
2277 | "EXT4-fs: unable to initialize " | |
2278 | "flex_bg meta info!\n"); | |
2279 | goto failed_mount2; | |
2280 | } | |
2281 | ||
ac27a0ec DK |
2282 | sbi->s_gdb_count = db_count; |
2283 | get_random_bytes(&sbi->s_next_generation, sizeof(u32)); | |
2284 | spin_lock_init(&sbi->s_next_gen_lock); | |
2285 | ||
833f4077 PZ |
2286 | err = percpu_counter_init(&sbi->s_freeblocks_counter, |
2287 | ext4_count_free_blocks(sb)); | |
2288 | if (!err) { | |
2289 | err = percpu_counter_init(&sbi->s_freeinodes_counter, | |
2290 | ext4_count_free_inodes(sb)); | |
2291 | } | |
2292 | if (!err) { | |
2293 | err = percpu_counter_init(&sbi->s_dirs_counter, | |
2294 | ext4_count_dirs(sb)); | |
2295 | } | |
6bc6e63f AK |
2296 | if (!err) { |
2297 | err = percpu_counter_init(&sbi->s_dirtyblocks_counter, 0); | |
2298 | } | |
833f4077 PZ |
2299 | if (err) { |
2300 | printk(KERN_ERR "EXT4-fs: insufficient memory\n"); | |
2301 | goto failed_mount3; | |
2302 | } | |
ac27a0ec DK |
2303 | |
2304 | /* per fileystem reservation list head & lock */ | |
2305 | spin_lock_init(&sbi->s_rsv_window_lock); | |
2306 | sbi->s_rsv_window_root = RB_ROOT; | |
2307 | /* Add a single, static dummy reservation to the start of the | |
2308 | * reservation window list --- it gives us a placeholder for | |
2309 | * append-at-start-of-list which makes the allocation logic | |
2310 | * _much_ simpler. */ | |
617ba13b MC |
2311 | sbi->s_rsv_window_head.rsv_start = EXT4_RESERVE_WINDOW_NOT_ALLOCATED; |
2312 | sbi->s_rsv_window_head.rsv_end = EXT4_RESERVE_WINDOW_NOT_ALLOCATED; | |
ac27a0ec DK |
2313 | sbi->s_rsv_window_head.rsv_alloc_hit = 0; |
2314 | sbi->s_rsv_window_head.rsv_goal_size = 0; | |
617ba13b | 2315 | ext4_rsv_window_add(sb, &sbi->s_rsv_window_head); |
ac27a0ec | 2316 | |
c9de560d AT |
2317 | sbi->s_stripe = ext4_get_stripe_size(sbi); |
2318 | ||
ac27a0ec DK |
2319 | /* |
2320 | * set up enough so that it can read an inode | |
2321 | */ | |
617ba13b MC |
2322 | sb->s_op = &ext4_sops; |
2323 | sb->s_export_op = &ext4_export_ops; | |
2324 | sb->s_xattr = ext4_xattr_handlers; | |
ac27a0ec | 2325 | #ifdef CONFIG_QUOTA |
617ba13b MC |
2326 | sb->s_qcop = &ext4_qctl_operations; |
2327 | sb->dq_op = &ext4_quota_operations; | |
ac27a0ec DK |
2328 | #endif |
2329 | INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */ | |
2330 | ||
2331 | sb->s_root = NULL; | |
2332 | ||
2333 | needs_recovery = (es->s_last_orphan != 0 || | |
617ba13b MC |
2334 | EXT4_HAS_INCOMPAT_FEATURE(sb, |
2335 | EXT4_FEATURE_INCOMPAT_RECOVER)); | |
ac27a0ec DK |
2336 | |
2337 | /* | |
2338 | * The first inode we look at is the journal inode. Don't try | |
2339 | * root first: it may be modified in the journal! | |
2340 | */ | |
2341 | if (!test_opt(sb, NOLOAD) && | |
617ba13b MC |
2342 | EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) { |
2343 | if (ext4_load_journal(sb, es, journal_devnum)) | |
ac27a0ec | 2344 | goto failed_mount3; |
624080ed TT |
2345 | if (!(sb->s_flags & MS_RDONLY) && |
2346 | EXT4_SB(sb)->s_journal->j_failed_commit) { | |
2347 | printk(KERN_CRIT "EXT4-fs error (device %s): " | |
2348 | "ext4_fill_super: Journal transaction " | |
2b2d6d01 | 2349 | "%u is corrupt\n", sb->s_id, |
624080ed | 2350 | EXT4_SB(sb)->s_journal->j_failed_commit); |
2b2d6d01 TT |
2351 | if (test_opt(sb, ERRORS_RO)) { |
2352 | printk(KERN_CRIT | |
2353 | "Mounting filesystem read-only\n"); | |
624080ed TT |
2354 | sb->s_flags |= MS_RDONLY; |
2355 | EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; | |
2356 | es->s_state |= cpu_to_le16(EXT4_ERROR_FS); | |
2357 | } | |
2358 | if (test_opt(sb, ERRORS_PANIC)) { | |
2359 | EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; | |
2360 | es->s_state |= cpu_to_le16(EXT4_ERROR_FS); | |
2361 | ext4_commit_super(sb, es, 1); | |
2362 | printk(KERN_CRIT | |
2363 | "EXT4-fs (device %s): mount failed\n", | |
2364 | sb->s_id); | |
2365 | goto failed_mount4; | |
2366 | } | |
2367 | } | |
ac27a0ec | 2368 | } else if (journal_inum) { |
617ba13b | 2369 | if (ext4_create_journal(sb, es, journal_inum)) |
ac27a0ec DK |
2370 | goto failed_mount3; |
2371 | } else { | |
2372 | if (!silent) | |
2b2d6d01 TT |
2373 | printk(KERN_ERR |
2374 | "ext4: No journal on filesystem on %s\n", | |
2375 | sb->s_id); | |
ac27a0ec DK |
2376 | goto failed_mount3; |
2377 | } | |
2378 | ||
eb40a09c JS |
2379 | if (ext4_blocks_count(es) > 0xffffffffULL && |
2380 | !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0, | |
2381 | JBD2_FEATURE_INCOMPAT_64BIT)) { | |
2382 | printk(KERN_ERR "ext4: Failed to set 64-bit journal feature\n"); | |
2383 | goto failed_mount4; | |
2384 | } | |
2385 | ||
818d276c GS |
2386 | if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) { |
2387 | jbd2_journal_set_features(sbi->s_journal, | |
2388 | JBD2_FEATURE_COMPAT_CHECKSUM, 0, | |
2389 | JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT); | |
2390 | } else if (test_opt(sb, JOURNAL_CHECKSUM)) { | |
2391 | jbd2_journal_set_features(sbi->s_journal, | |
2392 | JBD2_FEATURE_COMPAT_CHECKSUM, 0, 0); | |
2393 | jbd2_journal_clear_features(sbi->s_journal, 0, 0, | |
2394 | JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT); | |
2395 | } else { | |
2396 | jbd2_journal_clear_features(sbi->s_journal, | |
2397 | JBD2_FEATURE_COMPAT_CHECKSUM, 0, | |
2398 | JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT); | |
2399 | } | |
2400 | ||
ac27a0ec DK |
2401 | /* We have now updated the journal if required, so we can |
2402 | * validate the data journaling mode. */ | |
2403 | switch (test_opt(sb, DATA_FLAGS)) { | |
2404 | case 0: | |
2405 | /* No mode set, assume a default based on the journal | |
63f57933 AM |
2406 | * capabilities: ORDERED_DATA if the journal can |
2407 | * cope, else JOURNAL_DATA | |
2408 | */ | |
dab291af MC |
2409 | if (jbd2_journal_check_available_features |
2410 | (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) | |
ac27a0ec DK |
2411 | set_opt(sbi->s_mount_opt, ORDERED_DATA); |
2412 | else | |
2413 | set_opt(sbi->s_mount_opt, JOURNAL_DATA); | |
2414 | break; | |
2415 | ||
617ba13b MC |
2416 | case EXT4_MOUNT_ORDERED_DATA: |
2417 | case EXT4_MOUNT_WRITEBACK_DATA: | |
dab291af MC |
2418 | if (!jbd2_journal_check_available_features |
2419 | (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) { | |
617ba13b | 2420 | printk(KERN_ERR "EXT4-fs: Journal does not support " |
ac27a0ec DK |
2421 | "requested data journaling mode\n"); |
2422 | goto failed_mount4; | |
2423 | } | |
2424 | default: | |
2425 | break; | |
2426 | } | |
2427 | ||
2428 | if (test_opt(sb, NOBH)) { | |
617ba13b MC |
2429 | if (!(test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)) { |
2430 | printk(KERN_WARNING "EXT4-fs: Ignoring nobh option - " | |
ac27a0ec DK |
2431 | "its supported only with writeback mode\n"); |
2432 | clear_opt(sbi->s_mount_opt, NOBH); | |
2433 | } | |
2434 | } | |
2435 | /* | |
dab291af | 2436 | * The jbd2_journal_load will have done any necessary log recovery, |
ac27a0ec DK |
2437 | * so we can safely mount the rest of the filesystem now. |
2438 | */ | |
2439 | ||
1d1fe1ee DH |
2440 | root = ext4_iget(sb, EXT4_ROOT_INO); |
2441 | if (IS_ERR(root)) { | |
617ba13b | 2442 | printk(KERN_ERR "EXT4-fs: get root inode failed\n"); |
1d1fe1ee | 2443 | ret = PTR_ERR(root); |
ac27a0ec DK |
2444 | goto failed_mount4; |
2445 | } | |
2446 | if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { | |
1d1fe1ee | 2447 | iput(root); |
617ba13b | 2448 | printk(KERN_ERR "EXT4-fs: corrupt root inode, run e2fsck\n"); |
ac27a0ec DK |
2449 | goto failed_mount4; |
2450 | } | |
1d1fe1ee DH |
2451 | sb->s_root = d_alloc_root(root); |
2452 | if (!sb->s_root) { | |
2453 | printk(KERN_ERR "EXT4-fs: get root dentry failed\n"); | |
2454 | iput(root); | |
2455 | ret = -ENOMEM; | |
2456 | goto failed_mount4; | |
2457 | } | |
ac27a0ec | 2458 | |
2b2d6d01 | 2459 | ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY); |
ef7f3835 KS |
2460 | |
2461 | /* determine the minimum size of new large inodes, if present */ | |
2462 | if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) { | |
2463 | sbi->s_want_extra_isize = sizeof(struct ext4_inode) - | |
2464 | EXT4_GOOD_OLD_INODE_SIZE; | |
2465 | if (EXT4_HAS_RO_COMPAT_FEATURE(sb, | |
2466 | EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) { | |
2467 | if (sbi->s_want_extra_isize < | |
2468 | le16_to_cpu(es->s_want_extra_isize)) | |
2469 | sbi->s_want_extra_isize = | |
2470 | le16_to_cpu(es->s_want_extra_isize); | |
2471 | if (sbi->s_want_extra_isize < | |
2472 | le16_to_cpu(es->s_min_extra_isize)) | |
2473 | sbi->s_want_extra_isize = | |
2474 | le16_to_cpu(es->s_min_extra_isize); | |
2475 | } | |
2476 | } | |
2477 | /* Check if enough inode space is available */ | |
2478 | if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize > | |
2479 | sbi->s_inode_size) { | |
2480 | sbi->s_want_extra_isize = sizeof(struct ext4_inode) - | |
2481 | EXT4_GOOD_OLD_INODE_SIZE; | |
2482 | printk(KERN_INFO "EXT4-fs: required extra inode space not" | |
2483 | "available.\n"); | |
2484 | } | |
2485 | ||
ac27a0ec DK |
2486 | /* |
2487 | * akpm: core read_super() calls in here with the superblock locked. | |
2488 | * That deadlocks, because orphan cleanup needs to lock the superblock | |
2489 | * in numerous places. Here we just pop the lock - it's relatively | |
2490 | * harmless, because we are now ready to accept write_super() requests, | |
2491 | * and aviro says that's the only reason for hanging onto the | |
2492 | * superblock lock. | |
2493 | */ | |
617ba13b MC |
2494 | EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS; |
2495 | ext4_orphan_cleanup(sb, es); | |
2496 | EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS; | |
ac27a0ec | 2497 | if (needs_recovery) |
2b2d6d01 | 2498 | printk(KERN_INFO "EXT4-fs: recovery complete.\n"); |
617ba13b | 2499 | ext4_mark_recovery_complete(sb, es); |
2b2d6d01 TT |
2500 | printk(KERN_INFO "EXT4-fs: mounted filesystem with %s data mode.\n", |
2501 | test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA ? "journal": | |
2502 | test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA ? "ordered": | |
2503 | "writeback"); | |
ac27a0ec | 2504 | |
dd919b98 AK |
2505 | if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) { |
2506 | printk(KERN_WARNING "EXT4-fs: Ignoring delalloc option - " | |
2507 | "requested data journaling mode\n"); | |
2508 | clear_opt(sbi->s_mount_opt, DELALLOC); | |
2509 | } else if (test_opt(sb, DELALLOC)) | |
2510 | printk(KERN_INFO "EXT4-fs: delayed allocation enabled\n"); | |
2511 | ||
a86c6181 | 2512 | ext4_ext_init(sb); |
c9de560d | 2513 | ext4_mb_init(sb, needs_recovery); |
a86c6181 | 2514 | |
ac27a0ec DK |
2515 | lock_kernel(); |
2516 | return 0; | |
2517 | ||
617ba13b | 2518 | cantfind_ext4: |
ac27a0ec | 2519 | if (!silent) |
617ba13b | 2520 | printk(KERN_ERR "VFS: Can't find ext4 filesystem on dev %s.\n", |
ac27a0ec DK |
2521 | sb->s_id); |
2522 | goto failed_mount; | |
2523 | ||
2524 | failed_mount4: | |
dab291af | 2525 | jbd2_journal_destroy(sbi->s_journal); |
47b4a50b | 2526 | sbi->s_journal = NULL; |
ac27a0ec DK |
2527 | failed_mount3: |
2528 | percpu_counter_destroy(&sbi->s_freeblocks_counter); | |
2529 | percpu_counter_destroy(&sbi->s_freeinodes_counter); | |
2530 | percpu_counter_destroy(&sbi->s_dirs_counter); | |
6bc6e63f | 2531 | percpu_counter_destroy(&sbi->s_dirtyblocks_counter); |
ac27a0ec DK |
2532 | failed_mount2: |
2533 | for (i = 0; i < db_count; i++) | |
2534 | brelse(sbi->s_group_desc[i]); | |
2535 | kfree(sbi->s_group_desc); | |
2536 | failed_mount: | |
240799cd TT |
2537 | if (sbi->s_proc) { |
2538 | remove_proc_entry("inode_readahead_blks", sbi->s_proc); | |
9f6200bb | 2539 | remove_proc_entry(sb->s_id, ext4_proc_root); |
240799cd | 2540 | } |
ac27a0ec DK |
2541 | #ifdef CONFIG_QUOTA |
2542 | for (i = 0; i < MAXQUOTAS; i++) | |
2543 | kfree(sbi->s_qf_names[i]); | |
2544 | #endif | |
617ba13b | 2545 | ext4_blkdev_remove(sbi); |
ac27a0ec DK |
2546 | brelse(bh); |
2547 | out_fail: | |
2548 | sb->s_fs_info = NULL; | |
2549 | kfree(sbi); | |
2550 | lock_kernel(); | |
1d1fe1ee | 2551 | return ret; |
ac27a0ec DK |
2552 | } |
2553 | ||
2554 | /* | |
2555 | * Setup any per-fs journal parameters now. We'll do this both on | |
2556 | * initial mount, once the journal has been initialised but before we've | |
2557 | * done any recovery; and again on any subsequent remount. | |
2558 | */ | |
617ba13b | 2559 | static void ext4_init_journal_params(struct super_block *sb, journal_t *journal) |
ac27a0ec | 2560 | { |
617ba13b | 2561 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
ac27a0ec DK |
2562 | |
2563 | if (sbi->s_commit_interval) | |
2564 | journal->j_commit_interval = sbi->s_commit_interval; | |
617ba13b | 2565 | /* We could also set up an ext4-specific default for the commit |
ac27a0ec DK |
2566 | * interval here, but for now we'll just fall back to the jbd |
2567 | * default. */ | |
2568 | ||
2569 | spin_lock(&journal->j_state_lock); | |
2570 | if (test_opt(sb, BARRIER)) | |
dab291af | 2571 | journal->j_flags |= JBD2_BARRIER; |
ac27a0ec | 2572 | else |
dab291af | 2573 | journal->j_flags &= ~JBD2_BARRIER; |
ac27a0ec DK |
2574 | spin_unlock(&journal->j_state_lock); |
2575 | } | |
2576 | ||
617ba13b | 2577 | static journal_t *ext4_get_journal(struct super_block *sb, |
ac27a0ec DK |
2578 | unsigned int journal_inum) |
2579 | { | |
2580 | struct inode *journal_inode; | |
2581 | journal_t *journal; | |
2582 | ||
2583 | /* First, test for the existence of a valid inode on disk. Bad | |
2584 | * things happen if we iget() an unused inode, as the subsequent | |
2585 | * iput() will try to delete it. */ | |
2586 | ||
1d1fe1ee DH |
2587 | journal_inode = ext4_iget(sb, journal_inum); |
2588 | if (IS_ERR(journal_inode)) { | |
617ba13b | 2589 | printk(KERN_ERR "EXT4-fs: no journal found.\n"); |
ac27a0ec DK |
2590 | return NULL; |
2591 | } | |
2592 | if (!journal_inode->i_nlink) { | |
2593 | make_bad_inode(journal_inode); | |
2594 | iput(journal_inode); | |
617ba13b | 2595 | printk(KERN_ERR "EXT4-fs: journal inode is deleted.\n"); |
ac27a0ec DK |
2596 | return NULL; |
2597 | } | |
2598 | ||
e5f8eab8 | 2599 | jbd_debug(2, "Journal inode found at %p: %lld bytes\n", |
ac27a0ec | 2600 | journal_inode, journal_inode->i_size); |
1d1fe1ee | 2601 | if (!S_ISREG(journal_inode->i_mode)) { |
617ba13b | 2602 | printk(KERN_ERR "EXT4-fs: invalid journal inode.\n"); |
ac27a0ec DK |
2603 | iput(journal_inode); |
2604 | return NULL; | |
2605 | } | |
2606 | ||
dab291af | 2607 | journal = jbd2_journal_init_inode(journal_inode); |
ac27a0ec | 2608 | if (!journal) { |
617ba13b | 2609 | printk(KERN_ERR "EXT4-fs: Could not load journal inode\n"); |
ac27a0ec DK |
2610 | iput(journal_inode); |
2611 | return NULL; | |
2612 | } | |
2613 | journal->j_private = sb; | |
617ba13b | 2614 | ext4_init_journal_params(sb, journal); |
ac27a0ec DK |
2615 | return journal; |
2616 | } | |
2617 | ||
617ba13b | 2618 | static journal_t *ext4_get_dev_journal(struct super_block *sb, |
ac27a0ec DK |
2619 | dev_t j_dev) |
2620 | { | |
2b2d6d01 | 2621 | struct buffer_head *bh; |
ac27a0ec | 2622 | journal_t *journal; |
617ba13b MC |
2623 | ext4_fsblk_t start; |
2624 | ext4_fsblk_t len; | |
ac27a0ec | 2625 | int hblock, blocksize; |
617ba13b | 2626 | ext4_fsblk_t sb_block; |
ac27a0ec | 2627 | unsigned long offset; |
2b2d6d01 | 2628 | struct ext4_super_block *es; |
ac27a0ec DK |
2629 | struct block_device *bdev; |
2630 | ||
617ba13b | 2631 | bdev = ext4_blkdev_get(j_dev); |
ac27a0ec DK |
2632 | if (bdev == NULL) |
2633 | return NULL; | |
2634 | ||
2635 | if (bd_claim(bdev, sb)) { | |
2636 | printk(KERN_ERR | |
8c55e204 | 2637 | "EXT4: failed to claim external journal device.\n"); |
ac27a0ec DK |
2638 | blkdev_put(bdev); |
2639 | return NULL; | |
2640 | } | |
2641 | ||
2642 | blocksize = sb->s_blocksize; | |
2643 | hblock = bdev_hardsect_size(bdev); | |
2644 | if (blocksize < hblock) { | |
2645 | printk(KERN_ERR | |
617ba13b | 2646 | "EXT4-fs: blocksize too small for journal device.\n"); |
ac27a0ec DK |
2647 | goto out_bdev; |
2648 | } | |
2649 | ||
617ba13b MC |
2650 | sb_block = EXT4_MIN_BLOCK_SIZE / blocksize; |
2651 | offset = EXT4_MIN_BLOCK_SIZE % blocksize; | |
ac27a0ec DK |
2652 | set_blocksize(bdev, blocksize); |
2653 | if (!(bh = __bread(bdev, sb_block, blocksize))) { | |
617ba13b | 2654 | printk(KERN_ERR "EXT4-fs: couldn't read superblock of " |
ac27a0ec DK |
2655 | "external journal\n"); |
2656 | goto out_bdev; | |
2657 | } | |
2658 | ||
617ba13b MC |
2659 | es = (struct ext4_super_block *) (((char *)bh->b_data) + offset); |
2660 | if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) || | |
ac27a0ec | 2661 | !(le32_to_cpu(es->s_feature_incompat) & |
617ba13b MC |
2662 | EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) { |
2663 | printk(KERN_ERR "EXT4-fs: external journal has " | |
ac27a0ec DK |
2664 | "bad superblock\n"); |
2665 | brelse(bh); | |
2666 | goto out_bdev; | |
2667 | } | |
2668 | ||
617ba13b MC |
2669 | if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) { |
2670 | printk(KERN_ERR "EXT4-fs: journal UUID does not match\n"); | |
ac27a0ec DK |
2671 | brelse(bh); |
2672 | goto out_bdev; | |
2673 | } | |
2674 | ||
bd81d8ee | 2675 | len = ext4_blocks_count(es); |
ac27a0ec DK |
2676 | start = sb_block + 1; |
2677 | brelse(bh); /* we're done with the superblock */ | |
2678 | ||
dab291af | 2679 | journal = jbd2_journal_init_dev(bdev, sb->s_bdev, |
ac27a0ec DK |
2680 | start, len, blocksize); |
2681 | if (!journal) { | |
617ba13b | 2682 | printk(KERN_ERR "EXT4-fs: failed to create device journal\n"); |
ac27a0ec DK |
2683 | goto out_bdev; |
2684 | } | |
2685 | journal->j_private = sb; | |
2686 | ll_rw_block(READ, 1, &journal->j_sb_buffer); | |
2687 | wait_on_buffer(journal->j_sb_buffer); | |
2688 | if (!buffer_uptodate(journal->j_sb_buffer)) { | |
617ba13b | 2689 | printk(KERN_ERR "EXT4-fs: I/O error on journal device\n"); |
ac27a0ec DK |
2690 | goto out_journal; |
2691 | } | |
2692 | if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) { | |
617ba13b | 2693 | printk(KERN_ERR "EXT4-fs: External journal has more than one " |
ac27a0ec DK |
2694 | "user (unsupported) - %d\n", |
2695 | be32_to_cpu(journal->j_superblock->s_nr_users)); | |
2696 | goto out_journal; | |
2697 | } | |
617ba13b MC |
2698 | EXT4_SB(sb)->journal_bdev = bdev; |
2699 | ext4_init_journal_params(sb, journal); | |
ac27a0ec DK |
2700 | return journal; |
2701 | out_journal: | |
dab291af | 2702 | jbd2_journal_destroy(journal); |
ac27a0ec | 2703 | out_bdev: |
617ba13b | 2704 | ext4_blkdev_put(bdev); |
ac27a0ec DK |
2705 | return NULL; |
2706 | } | |
2707 | ||
617ba13b MC |
2708 | static int ext4_load_journal(struct super_block *sb, |
2709 | struct ext4_super_block *es, | |
ac27a0ec DK |
2710 | unsigned long journal_devnum) |
2711 | { | |
2712 | journal_t *journal; | |
2713 | unsigned int journal_inum = le32_to_cpu(es->s_journal_inum); | |
2714 | dev_t journal_dev; | |
2715 | int err = 0; | |
2716 | int really_read_only; | |
2717 | ||
2718 | if (journal_devnum && | |
2719 | journal_devnum != le32_to_cpu(es->s_journal_dev)) { | |
617ba13b | 2720 | printk(KERN_INFO "EXT4-fs: external journal device major/minor " |
ac27a0ec DK |
2721 | "numbers have changed\n"); |
2722 | journal_dev = new_decode_dev(journal_devnum); | |
2723 | } else | |
2724 | journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev)); | |
2725 | ||
2726 | really_read_only = bdev_read_only(sb->s_bdev); | |
2727 | ||
2728 | /* | |
2729 | * Are we loading a blank journal or performing recovery after a | |
2730 | * crash? For recovery, we need to check in advance whether we | |
2731 | * can get read-write access to the device. | |
2732 | */ | |
2733 | ||
617ba13b | 2734 | if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) { |
ac27a0ec | 2735 | if (sb->s_flags & MS_RDONLY) { |
617ba13b | 2736 | printk(KERN_INFO "EXT4-fs: INFO: recovery " |
ac27a0ec DK |
2737 | "required on readonly filesystem.\n"); |
2738 | if (really_read_only) { | |
617ba13b | 2739 | printk(KERN_ERR "EXT4-fs: write access " |
ac27a0ec DK |
2740 | "unavailable, cannot proceed.\n"); |
2741 | return -EROFS; | |
2742 | } | |
2b2d6d01 TT |
2743 | printk(KERN_INFO "EXT4-fs: write access will " |
2744 | "be enabled during recovery.\n"); | |
ac27a0ec DK |
2745 | } |
2746 | } | |
2747 | ||
2748 | if (journal_inum && journal_dev) { | |
617ba13b | 2749 | printk(KERN_ERR "EXT4-fs: filesystem has both journal " |
ac27a0ec DK |
2750 | "and inode journals!\n"); |
2751 | return -EINVAL; | |
2752 | } | |
2753 | ||
2754 | if (journal_inum) { | |
617ba13b | 2755 | if (!(journal = ext4_get_journal(sb, journal_inum))) |
ac27a0ec DK |
2756 | return -EINVAL; |
2757 | } else { | |
617ba13b | 2758 | if (!(journal = ext4_get_dev_journal(sb, journal_dev))) |
ac27a0ec DK |
2759 | return -EINVAL; |
2760 | } | |
2761 | ||
4776004f TT |
2762 | if (journal->j_flags & JBD2_BARRIER) |
2763 | printk(KERN_INFO "EXT4-fs: barriers enabled\n"); | |
2764 | else | |
2765 | printk(KERN_INFO "EXT4-fs: barriers disabled\n"); | |
2766 | ||
ac27a0ec | 2767 | if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) { |
dab291af | 2768 | err = jbd2_journal_update_format(journal); |
ac27a0ec | 2769 | if (err) { |
617ba13b | 2770 | printk(KERN_ERR "EXT4-fs: error updating journal.\n"); |
dab291af | 2771 | jbd2_journal_destroy(journal); |
ac27a0ec DK |
2772 | return err; |
2773 | } | |
2774 | } | |
2775 | ||
617ba13b | 2776 | if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) |
dab291af | 2777 | err = jbd2_journal_wipe(journal, !really_read_only); |
ac27a0ec | 2778 | if (!err) |
dab291af | 2779 | err = jbd2_journal_load(journal); |
ac27a0ec DK |
2780 | |
2781 | if (err) { | |
617ba13b | 2782 | printk(KERN_ERR "EXT4-fs: error loading journal.\n"); |
dab291af | 2783 | jbd2_journal_destroy(journal); |
ac27a0ec DK |
2784 | return err; |
2785 | } | |
2786 | ||
617ba13b MC |
2787 | EXT4_SB(sb)->s_journal = journal; |
2788 | ext4_clear_journal_err(sb, es); | |
ac27a0ec DK |
2789 | |
2790 | if (journal_devnum && | |
2791 | journal_devnum != le32_to_cpu(es->s_journal_dev)) { | |
2792 | es->s_journal_dev = cpu_to_le32(journal_devnum); | |
2793 | sb->s_dirt = 1; | |
2794 | ||
2795 | /* Make sure we flush the recovery flag to disk. */ | |
617ba13b | 2796 | ext4_commit_super(sb, es, 1); |
ac27a0ec DK |
2797 | } |
2798 | ||
2799 | return 0; | |
2800 | } | |
2801 | ||
2b2d6d01 TT |
2802 | static int ext4_create_journal(struct super_block *sb, |
2803 | struct ext4_super_block *es, | |
ac27a0ec DK |
2804 | unsigned int journal_inum) |
2805 | { | |
2806 | journal_t *journal; | |
6c675bd4 | 2807 | int err; |
ac27a0ec DK |
2808 | |
2809 | if (sb->s_flags & MS_RDONLY) { | |
617ba13b | 2810 | printk(KERN_ERR "EXT4-fs: readonly filesystem when trying to " |
ac27a0ec DK |
2811 | "create journal.\n"); |
2812 | return -EROFS; | |
2813 | } | |
2814 | ||
6c675bd4 BP |
2815 | journal = ext4_get_journal(sb, journal_inum); |
2816 | if (!journal) | |
ac27a0ec DK |
2817 | return -EINVAL; |
2818 | ||
617ba13b | 2819 | printk(KERN_INFO "EXT4-fs: creating new journal on inode %u\n", |
ac27a0ec DK |
2820 | journal_inum); |
2821 | ||
6c675bd4 BP |
2822 | err = jbd2_journal_create(journal); |
2823 | if (err) { | |
617ba13b | 2824 | printk(KERN_ERR "EXT4-fs: error creating journal.\n"); |
dab291af | 2825 | jbd2_journal_destroy(journal); |
ac27a0ec DK |
2826 | return -EIO; |
2827 | } | |
2828 | ||
617ba13b | 2829 | EXT4_SB(sb)->s_journal = journal; |
ac27a0ec | 2830 | |
617ba13b MC |
2831 | ext4_update_dynamic_rev(sb); |
2832 | EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); | |
2833 | EXT4_SET_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL); | |
ac27a0ec DK |
2834 | |
2835 | es->s_journal_inum = cpu_to_le32(journal_inum); | |
2836 | sb->s_dirt = 1; | |
2837 | ||
2838 | /* Make sure we flush the recovery flag to disk. */ | |
617ba13b | 2839 | ext4_commit_super(sb, es, 1); |
ac27a0ec DK |
2840 | |
2841 | return 0; | |
2842 | } | |
2843 | ||
2b2d6d01 TT |
2844 | static void ext4_commit_super(struct super_block *sb, |
2845 | struct ext4_super_block *es, int sync) | |
ac27a0ec | 2846 | { |
617ba13b | 2847 | struct buffer_head *sbh = EXT4_SB(sb)->s_sbh; |
ac27a0ec DK |
2848 | |
2849 | if (!sbh) | |
2850 | return; | |
914258bf TT |
2851 | if (buffer_write_io_error(sbh)) { |
2852 | /* | |
2853 | * Oh, dear. A previous attempt to write the | |
2854 | * superblock failed. This could happen because the | |
2855 | * USB device was yanked out. Or it could happen to | |
2856 | * be a transient write error and maybe the block will | |
2857 | * be remapped. Nothing we can do but to retry the | |
2858 | * write and hope for the best. | |
2859 | */ | |
2860 | printk(KERN_ERR "ext4: previous I/O error to " | |
2861 | "superblock detected for %s.\n", sb->s_id); | |
2862 | clear_buffer_write_io_error(sbh); | |
2863 | set_buffer_uptodate(sbh); | |
2864 | } | |
ac27a0ec | 2865 | es->s_wtime = cpu_to_le32(get_seconds()); |
bd81d8ee | 2866 | ext4_free_blocks_count_set(es, ext4_count_free_blocks(sb)); |
617ba13b | 2867 | es->s_free_inodes_count = cpu_to_le32(ext4_count_free_inodes(sb)); |
ac27a0ec DK |
2868 | BUFFER_TRACE(sbh, "marking dirty"); |
2869 | mark_buffer_dirty(sbh); | |
914258bf | 2870 | if (sync) { |
ac27a0ec | 2871 | sync_dirty_buffer(sbh); |
914258bf TT |
2872 | if (buffer_write_io_error(sbh)) { |
2873 | printk(KERN_ERR "ext4: I/O error while writing " | |
2874 | "superblock for %s.\n", sb->s_id); | |
2875 | clear_buffer_write_io_error(sbh); | |
2876 | set_buffer_uptodate(sbh); | |
2877 | } | |
2878 | } | |
ac27a0ec DK |
2879 | } |
2880 | ||
2881 | ||
2882 | /* | |
2883 | * Have we just finished recovery? If so, and if we are mounting (or | |
2884 | * remounting) the filesystem readonly, then we will end up with a | |
2885 | * consistent fs on disk. Record that fact. | |
2886 | */ | |
2b2d6d01 TT |
2887 | static void ext4_mark_recovery_complete(struct super_block *sb, |
2888 | struct ext4_super_block *es) | |
ac27a0ec | 2889 | { |
617ba13b | 2890 | journal_t *journal = EXT4_SB(sb)->s_journal; |
ac27a0ec | 2891 | |
dab291af MC |
2892 | jbd2_journal_lock_updates(journal); |
2893 | jbd2_journal_flush(journal); | |
32c37730 | 2894 | lock_super(sb); |
617ba13b | 2895 | if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) && |
ac27a0ec | 2896 | sb->s_flags & MS_RDONLY) { |
617ba13b | 2897 | EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); |
ac27a0ec | 2898 | sb->s_dirt = 0; |
617ba13b | 2899 | ext4_commit_super(sb, es, 1); |
ac27a0ec | 2900 | } |
32c37730 | 2901 | unlock_super(sb); |
dab291af | 2902 | jbd2_journal_unlock_updates(journal); |
ac27a0ec DK |
2903 | } |
2904 | ||
2905 | /* | |
2906 | * If we are mounting (or read-write remounting) a filesystem whose journal | |
2907 | * has recorded an error from a previous lifetime, move that error to the | |
2908 | * main filesystem now. | |
2909 | */ | |
2b2d6d01 TT |
2910 | static void ext4_clear_journal_err(struct super_block *sb, |
2911 | struct ext4_super_block *es) | |
ac27a0ec DK |
2912 | { |
2913 | journal_t *journal; | |
2914 | int j_errno; | |
2915 | const char *errstr; | |
2916 | ||
617ba13b | 2917 | journal = EXT4_SB(sb)->s_journal; |
ac27a0ec DK |
2918 | |
2919 | /* | |
2920 | * Now check for any error status which may have been recorded in the | |
617ba13b | 2921 | * journal by a prior ext4_error() or ext4_abort() |
ac27a0ec DK |
2922 | */ |
2923 | ||
dab291af | 2924 | j_errno = jbd2_journal_errno(journal); |
ac27a0ec DK |
2925 | if (j_errno) { |
2926 | char nbuf[16]; | |
2927 | ||
617ba13b | 2928 | errstr = ext4_decode_error(sb, j_errno, nbuf); |
46e665e9 | 2929 | ext4_warning(sb, __func__, "Filesystem error recorded " |
ac27a0ec | 2930 | "from previous mount: %s", errstr); |
46e665e9 | 2931 | ext4_warning(sb, __func__, "Marking fs in need of " |
ac27a0ec DK |
2932 | "filesystem check."); |
2933 | ||
617ba13b MC |
2934 | EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; |
2935 | es->s_state |= cpu_to_le16(EXT4_ERROR_FS); | |
2b2d6d01 | 2936 | ext4_commit_super(sb, es, 1); |
ac27a0ec | 2937 | |
dab291af | 2938 | jbd2_journal_clear_err(journal); |
ac27a0ec DK |
2939 | } |
2940 | } | |
2941 | ||
2942 | /* | |
2943 | * Force the running and committing transactions to commit, | |
2944 | * and wait on the commit. | |
2945 | */ | |
617ba13b | 2946 | int ext4_force_commit(struct super_block *sb) |
ac27a0ec DK |
2947 | { |
2948 | journal_t *journal; | |
2949 | int ret; | |
2950 | ||
2951 | if (sb->s_flags & MS_RDONLY) | |
2952 | return 0; | |
2953 | ||
617ba13b | 2954 | journal = EXT4_SB(sb)->s_journal; |
ac27a0ec | 2955 | sb->s_dirt = 0; |
617ba13b | 2956 | ret = ext4_journal_force_commit(journal); |
ac27a0ec DK |
2957 | return ret; |
2958 | } | |
2959 | ||
2960 | /* | |
617ba13b | 2961 | * Ext4 always journals updates to the superblock itself, so we don't |
ac27a0ec DK |
2962 | * have to propagate any other updates to the superblock on disk at this |
2963 | * point. Just start an async writeback to get the buffers on their way | |
2964 | * to the disk. | |
2965 | * | |
2966 | * This implicitly triggers the writebehind on sync(). | |
2967 | */ | |
2968 | ||
2b2d6d01 | 2969 | static void ext4_write_super(struct super_block *sb) |
ac27a0ec DK |
2970 | { |
2971 | if (mutex_trylock(&sb->s_lock) != 0) | |
2972 | BUG(); | |
2973 | sb->s_dirt = 0; | |
2974 | } | |
2975 | ||
617ba13b | 2976 | static int ext4_sync_fs(struct super_block *sb, int wait) |
ac27a0ec DK |
2977 | { |
2978 | tid_t target; | |
2979 | ||
2980 | sb->s_dirt = 0; | |
dab291af | 2981 | if (jbd2_journal_start_commit(EXT4_SB(sb)->s_journal, &target)) { |
ac27a0ec | 2982 | if (wait) |
dab291af | 2983 | jbd2_log_wait_commit(EXT4_SB(sb)->s_journal, target); |
ac27a0ec DK |
2984 | } |
2985 | return 0; | |
2986 | } | |
2987 | ||
2988 | /* | |
2989 | * LVM calls this function before a (read-only) snapshot is created. This | |
2990 | * gives us a chance to flush the journal completely and mark the fs clean. | |
2991 | */ | |
617ba13b | 2992 | static void ext4_write_super_lockfs(struct super_block *sb) |
ac27a0ec DK |
2993 | { |
2994 | sb->s_dirt = 0; | |
2995 | ||
2996 | if (!(sb->s_flags & MS_RDONLY)) { | |
617ba13b | 2997 | journal_t *journal = EXT4_SB(sb)->s_journal; |
ac27a0ec DK |
2998 | |
2999 | /* Now we set up the journal barrier. */ | |
dab291af MC |
3000 | jbd2_journal_lock_updates(journal); |
3001 | jbd2_journal_flush(journal); | |
ac27a0ec DK |
3002 | |
3003 | /* Journal blocked and flushed, clear needs_recovery flag. */ | |
617ba13b MC |
3004 | EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); |
3005 | ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1); | |
ac27a0ec DK |
3006 | } |
3007 | } | |
3008 | ||
3009 | /* | |
3010 | * Called by LVM after the snapshot is done. We need to reset the RECOVER | |
3011 | * flag here, even though the filesystem is not technically dirty yet. | |
3012 | */ | |
617ba13b | 3013 | static void ext4_unlockfs(struct super_block *sb) |
ac27a0ec DK |
3014 | { |
3015 | if (!(sb->s_flags & MS_RDONLY)) { | |
3016 | lock_super(sb); | |
3017 | /* Reser the needs_recovery flag before the fs is unlocked. */ | |
617ba13b MC |
3018 | EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); |
3019 | ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1); | |
ac27a0ec | 3020 | unlock_super(sb); |
dab291af | 3021 | jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); |
ac27a0ec DK |
3022 | } |
3023 | } | |
3024 | ||
2b2d6d01 | 3025 | static int ext4_remount(struct super_block *sb, int *flags, char *data) |
ac27a0ec | 3026 | { |
2b2d6d01 | 3027 | struct ext4_super_block *es; |
617ba13b MC |
3028 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
3029 | ext4_fsblk_t n_blocks_count = 0; | |
ac27a0ec | 3030 | unsigned long old_sb_flags; |
617ba13b | 3031 | struct ext4_mount_options old_opts; |
8a266467 | 3032 | ext4_group_t g; |
ac27a0ec DK |
3033 | int err; |
3034 | #ifdef CONFIG_QUOTA | |
3035 | int i; | |
3036 | #endif | |
3037 | ||
3038 | /* Store the original options */ | |
3039 | old_sb_flags = sb->s_flags; | |
3040 | old_opts.s_mount_opt = sbi->s_mount_opt; | |
3041 | old_opts.s_resuid = sbi->s_resuid; | |
3042 | old_opts.s_resgid = sbi->s_resgid; | |
3043 | old_opts.s_commit_interval = sbi->s_commit_interval; | |
3044 | #ifdef CONFIG_QUOTA | |
3045 | old_opts.s_jquota_fmt = sbi->s_jquota_fmt; | |
3046 | for (i = 0; i < MAXQUOTAS; i++) | |
3047 | old_opts.s_qf_names[i] = sbi->s_qf_names[i]; | |
3048 | #endif | |
3049 | ||
3050 | /* | |
3051 | * Allow the "check" option to be passed as a remount option. | |
3052 | */ | |
3053 | if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) { | |
3054 | err = -EINVAL; | |
3055 | goto restore_opts; | |
3056 | } | |
3057 | ||
617ba13b | 3058 | if (sbi->s_mount_opt & EXT4_MOUNT_ABORT) |
46e665e9 | 3059 | ext4_abort(sb, __func__, "Abort forced by user"); |
ac27a0ec DK |
3060 | |
3061 | sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | | |
617ba13b | 3062 | ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0); |
ac27a0ec DK |
3063 | |
3064 | es = sbi->s_es; | |
3065 | ||
617ba13b | 3066 | ext4_init_journal_params(sb, sbi->s_journal); |
ac27a0ec DK |
3067 | |
3068 | if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) || | |
bd81d8ee | 3069 | n_blocks_count > ext4_blocks_count(es)) { |
617ba13b | 3070 | if (sbi->s_mount_opt & EXT4_MOUNT_ABORT) { |
ac27a0ec DK |
3071 | err = -EROFS; |
3072 | goto restore_opts; | |
3073 | } | |
3074 | ||
3075 | if (*flags & MS_RDONLY) { | |
3076 | /* | |
3077 | * First of all, the unconditional stuff we have to do | |
3078 | * to disable replay of the journal when we next remount | |
3079 | */ | |
3080 | sb->s_flags |= MS_RDONLY; | |
3081 | ||
3082 | /* | |
3083 | * OK, test if we are remounting a valid rw partition | |
3084 | * readonly, and if so set the rdonly flag and then | |
3085 | * mark the partition as valid again. | |
3086 | */ | |
617ba13b MC |
3087 | if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) && |
3088 | (sbi->s_mount_state & EXT4_VALID_FS)) | |
ac27a0ec DK |
3089 | es->s_state = cpu_to_le16(sbi->s_mount_state); |
3090 | ||
32c37730 JK |
3091 | /* |
3092 | * We have to unlock super so that we can wait for | |
3093 | * transactions. | |
3094 | */ | |
3095 | unlock_super(sb); | |
617ba13b | 3096 | ext4_mark_recovery_complete(sb, es); |
32c37730 | 3097 | lock_super(sb); |
ac27a0ec DK |
3098 | } else { |
3099 | __le32 ret; | |
617ba13b MC |
3100 | if ((ret = EXT4_HAS_RO_COMPAT_FEATURE(sb, |
3101 | ~EXT4_FEATURE_RO_COMPAT_SUPP))) { | |
3102 | printk(KERN_WARNING "EXT4-fs: %s: couldn't " | |
ac27a0ec DK |
3103 | "remount RDWR because of unsupported " |
3104 | "optional features (%x).\n", | |
3105 | sb->s_id, le32_to_cpu(ret)); | |
3106 | err = -EROFS; | |
3107 | goto restore_opts; | |
3108 | } | |
ead6596b | 3109 | |
8a266467 TT |
3110 | /* |
3111 | * Make sure the group descriptor checksums | |
3112 | * are sane. If they aren't, refuse to | |
3113 | * remount r/w. | |
3114 | */ | |
3115 | for (g = 0; g < sbi->s_groups_count; g++) { | |
3116 | struct ext4_group_desc *gdp = | |
3117 | ext4_get_group_desc(sb, g, NULL); | |
3118 | ||
3119 | if (!ext4_group_desc_csum_verify(sbi, g, gdp)) { | |
3120 | printk(KERN_ERR | |
3121 | "EXT4-fs: ext4_remount: " | |
3122 | "Checksum for group %lu failed (%u!=%u)\n", | |
3123 | g, le16_to_cpu(ext4_group_desc_csum(sbi, g, gdp)), | |
3124 | le16_to_cpu(gdp->bg_checksum)); | |
3125 | err = -EINVAL; | |
3126 | goto restore_opts; | |
3127 | } | |
3128 | } | |
3129 | ||
ead6596b ES |
3130 | /* |
3131 | * If we have an unprocessed orphan list hanging | |
3132 | * around from a previously readonly bdev mount, | |
3133 | * require a full umount/remount for now. | |
3134 | */ | |
3135 | if (es->s_last_orphan) { | |
3136 | printk(KERN_WARNING "EXT4-fs: %s: couldn't " | |
3137 | "remount RDWR because of unprocessed " | |
3138 | "orphan inode list. Please " | |
3139 | "umount/remount instead.\n", | |
3140 | sb->s_id); | |
3141 | err = -EINVAL; | |
3142 | goto restore_opts; | |
3143 | } | |
3144 | ||
ac27a0ec DK |
3145 | /* |
3146 | * Mounting a RDONLY partition read-write, so reread | |
3147 | * and store the current valid flag. (It may have | |
3148 | * been changed by e2fsck since we originally mounted | |
3149 | * the partition.) | |
3150 | */ | |
617ba13b | 3151 | ext4_clear_journal_err(sb, es); |
ac27a0ec | 3152 | sbi->s_mount_state = le16_to_cpu(es->s_state); |
617ba13b | 3153 | if ((err = ext4_group_extend(sb, es, n_blocks_count))) |
ac27a0ec | 3154 | goto restore_opts; |
2b2d6d01 | 3155 | if (!ext4_setup_super(sb, es, 0)) |
ac27a0ec DK |
3156 | sb->s_flags &= ~MS_RDONLY; |
3157 | } | |
3158 | } | |
3159 | #ifdef CONFIG_QUOTA | |
3160 | /* Release old quota file names */ | |
3161 | for (i = 0; i < MAXQUOTAS; i++) | |
3162 | if (old_opts.s_qf_names[i] && | |
3163 | old_opts.s_qf_names[i] != sbi->s_qf_names[i]) | |
3164 | kfree(old_opts.s_qf_names[i]); | |
3165 | #endif | |
3166 | return 0; | |
3167 | restore_opts: | |
3168 | sb->s_flags = old_sb_flags; | |
3169 | sbi->s_mount_opt = old_opts.s_mount_opt; | |
3170 | sbi->s_resuid = old_opts.s_resuid; | |
3171 | sbi->s_resgid = old_opts.s_resgid; | |
3172 | sbi->s_commit_interval = old_opts.s_commit_interval; | |
3173 | #ifdef CONFIG_QUOTA | |
3174 | sbi->s_jquota_fmt = old_opts.s_jquota_fmt; | |
3175 | for (i = 0; i < MAXQUOTAS; i++) { | |
3176 | if (sbi->s_qf_names[i] && | |
3177 | old_opts.s_qf_names[i] != sbi->s_qf_names[i]) | |
3178 | kfree(sbi->s_qf_names[i]); | |
3179 | sbi->s_qf_names[i] = old_opts.s_qf_names[i]; | |
3180 | } | |
3181 | #endif | |
3182 | return err; | |
3183 | } | |
3184 | ||
2b2d6d01 | 3185 | static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf) |
ac27a0ec DK |
3186 | { |
3187 | struct super_block *sb = dentry->d_sb; | |
617ba13b MC |
3188 | struct ext4_sb_info *sbi = EXT4_SB(sb); |
3189 | struct ext4_super_block *es = sbi->s_es; | |
960cc398 | 3190 | u64 fsid; |
ac27a0ec | 3191 | |
5e70030d BP |
3192 | if (test_opt(sb, MINIX_DF)) { |
3193 | sbi->s_overhead_last = 0; | |
6bc9feff | 3194 | } else if (sbi->s_blocks_last != ext4_blocks_count(es)) { |
fd2d4291 | 3195 | ext4_group_t ngroups = sbi->s_groups_count, i; |
5e70030d | 3196 | ext4_fsblk_t overhead = 0; |
ac27a0ec DK |
3197 | smp_rmb(); |
3198 | ||
3199 | /* | |
5e70030d BP |
3200 | * Compute the overhead (FS structures). This is constant |
3201 | * for a given filesystem unless the number of block groups | |
3202 | * changes so we cache the previous value until it does. | |
ac27a0ec DK |
3203 | */ |
3204 | ||
3205 | /* | |
3206 | * All of the blocks before first_data_block are | |
3207 | * overhead | |
3208 | */ | |
3209 | overhead = le32_to_cpu(es->s_first_data_block); | |
3210 | ||
3211 | /* | |
3212 | * Add the overhead attributed to the superblock and | |
3213 | * block group descriptors. If the sparse superblocks | |
3214 | * feature is turned on, then not all groups have this. | |
3215 | */ | |
3216 | for (i = 0; i < ngroups; i++) { | |
617ba13b MC |
3217 | overhead += ext4_bg_has_super(sb, i) + |
3218 | ext4_bg_num_gdb(sb, i); | |
ac27a0ec DK |
3219 | cond_resched(); |
3220 | } | |
3221 | ||
3222 | /* | |
3223 | * Every block group has an inode bitmap, a block | |
3224 | * bitmap, and an inode table. | |
3225 | */ | |
5e70030d BP |
3226 | overhead += ngroups * (2 + sbi->s_itb_per_group); |
3227 | sbi->s_overhead_last = overhead; | |
3228 | smp_wmb(); | |
6bc9feff | 3229 | sbi->s_blocks_last = ext4_blocks_count(es); |
ac27a0ec DK |
3230 | } |
3231 | ||
617ba13b | 3232 | buf->f_type = EXT4_SUPER_MAGIC; |
ac27a0ec | 3233 | buf->f_bsize = sb->s_blocksize; |
5e70030d | 3234 | buf->f_blocks = ext4_blocks_count(es) - sbi->s_overhead_last; |
6bc6e63f AK |
3235 | buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter) - |
3236 | percpu_counter_sum_positive(&sbi->s_dirtyblocks_counter); | |
308ba3ec | 3237 | ext4_free_blocks_count_set(es, buf->f_bfree); |
bd81d8ee LV |
3238 | buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es); |
3239 | if (buf->f_bfree < ext4_r_blocks_count(es)) | |
ac27a0ec DK |
3240 | buf->f_bavail = 0; |
3241 | buf->f_files = le32_to_cpu(es->s_inodes_count); | |
52d9f3b4 | 3242 | buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter); |
5e70030d | 3243 | es->s_free_inodes_count = cpu_to_le32(buf->f_ffree); |
617ba13b | 3244 | buf->f_namelen = EXT4_NAME_LEN; |
960cc398 PE |
3245 | fsid = le64_to_cpup((void *)es->s_uuid) ^ |
3246 | le64_to_cpup((void *)es->s_uuid + sizeof(u64)); | |
3247 | buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL; | |
3248 | buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL; | |
ac27a0ec DK |
3249 | return 0; |
3250 | } | |
3251 | ||
3252 | /* Helper function for writing quotas on sync - we need to start transaction before quota file | |
3253 | * is locked for write. Otherwise the are possible deadlocks: | |
3254 | * Process 1 Process 2 | |
617ba13b | 3255 | * ext4_create() quota_sync() |
dab291af | 3256 | * jbd2_journal_start() write_dquot() |
ac27a0ec | 3257 | * DQUOT_INIT() down(dqio_mutex) |
dab291af | 3258 | * down(dqio_mutex) jbd2_journal_start() |
ac27a0ec DK |
3259 | * |
3260 | */ | |
3261 | ||
3262 | #ifdef CONFIG_QUOTA | |
3263 | ||
3264 | static inline struct inode *dquot_to_inode(struct dquot *dquot) | |
3265 | { | |
3266 | return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type]; | |
3267 | } | |
3268 | ||
617ba13b | 3269 | static int ext4_dquot_initialize(struct inode *inode, int type) |
ac27a0ec DK |
3270 | { |
3271 | handle_t *handle; | |
3272 | int ret, err; | |
3273 | ||
3274 | /* We may create quota structure so we need to reserve enough blocks */ | |
617ba13b | 3275 | handle = ext4_journal_start(inode, 2*EXT4_QUOTA_INIT_BLOCKS(inode->i_sb)); |
ac27a0ec DK |
3276 | if (IS_ERR(handle)) |
3277 | return PTR_ERR(handle); | |
3278 | ret = dquot_initialize(inode, type); | |
617ba13b | 3279 | err = ext4_journal_stop(handle); |
ac27a0ec DK |
3280 | if (!ret) |
3281 | ret = err; | |
3282 | return ret; | |
3283 | } | |
3284 | ||
617ba13b | 3285 | static int ext4_dquot_drop(struct inode *inode) |
ac27a0ec DK |
3286 | { |
3287 | handle_t *handle; | |
3288 | int ret, err; | |
3289 | ||
3290 | /* We may delete quota structure so we need to reserve enough blocks */ | |
617ba13b | 3291 | handle = ext4_journal_start(inode, 2*EXT4_QUOTA_DEL_BLOCKS(inode->i_sb)); |
2887df13 JK |
3292 | if (IS_ERR(handle)) { |
3293 | /* | |
3294 | * We call dquot_drop() anyway to at least release references | |
3295 | * to quota structures so that umount does not hang. | |
3296 | */ | |
3297 | dquot_drop(inode); | |
ac27a0ec | 3298 | return PTR_ERR(handle); |
2887df13 | 3299 | } |
ac27a0ec | 3300 | ret = dquot_drop(inode); |
617ba13b | 3301 | err = ext4_journal_stop(handle); |
ac27a0ec DK |
3302 | if (!ret) |
3303 | ret = err; | |
3304 | return ret; | |
3305 | } | |
3306 | ||
617ba13b | 3307 | static int ext4_write_dquot(struct dquot *dquot) |
ac27a0ec DK |
3308 | { |
3309 | int ret, err; | |
3310 | handle_t *handle; | |
3311 | struct inode *inode; | |
3312 | ||
3313 | inode = dquot_to_inode(dquot); | |
617ba13b MC |
3314 | handle = ext4_journal_start(inode, |
3315 | EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb)); | |
ac27a0ec DK |
3316 | if (IS_ERR(handle)) |
3317 | return PTR_ERR(handle); | |
3318 | ret = dquot_commit(dquot); | |
617ba13b | 3319 | err = ext4_journal_stop(handle); |
ac27a0ec DK |
3320 | if (!ret) |
3321 | ret = err; | |
3322 | return ret; | |
3323 | } | |
3324 | ||
617ba13b | 3325 | static int ext4_acquire_dquot(struct dquot *dquot) |
ac27a0ec DK |
3326 | { |
3327 | int ret, err; | |
3328 | handle_t *handle; | |
3329 | ||
617ba13b MC |
3330 | handle = ext4_journal_start(dquot_to_inode(dquot), |
3331 | EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb)); | |
ac27a0ec DK |
3332 | if (IS_ERR(handle)) |
3333 | return PTR_ERR(handle); | |
3334 | ret = dquot_acquire(dquot); | |
617ba13b | 3335 | err = ext4_journal_stop(handle); |
ac27a0ec DK |
3336 | if (!ret) |
3337 | ret = err; | |
3338 | return ret; | |
3339 | } | |
3340 | ||
617ba13b | 3341 | static int ext4_release_dquot(struct dquot *dquot) |
ac27a0ec DK |
3342 | { |
3343 | int ret, err; | |
3344 | handle_t *handle; | |
3345 | ||
617ba13b MC |
3346 | handle = ext4_journal_start(dquot_to_inode(dquot), |
3347 | EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb)); | |
9c3013e9 JK |
3348 | if (IS_ERR(handle)) { |
3349 | /* Release dquot anyway to avoid endless cycle in dqput() */ | |
3350 | dquot_release(dquot); | |
ac27a0ec | 3351 | return PTR_ERR(handle); |
9c3013e9 | 3352 | } |
ac27a0ec | 3353 | ret = dquot_release(dquot); |
617ba13b | 3354 | err = ext4_journal_stop(handle); |
ac27a0ec DK |
3355 | if (!ret) |
3356 | ret = err; | |
3357 | return ret; | |
3358 | } | |
3359 | ||
617ba13b | 3360 | static int ext4_mark_dquot_dirty(struct dquot *dquot) |
ac27a0ec | 3361 | { |
2c8be6b2 | 3362 | /* Are we journaling quotas? */ |
617ba13b MC |
3363 | if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] || |
3364 | EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) { | |
ac27a0ec | 3365 | dquot_mark_dquot_dirty(dquot); |
617ba13b | 3366 | return ext4_write_dquot(dquot); |
ac27a0ec DK |
3367 | } else { |
3368 | return dquot_mark_dquot_dirty(dquot); | |
3369 | } | |
3370 | } | |
3371 | ||
617ba13b | 3372 | static int ext4_write_info(struct super_block *sb, int type) |
ac27a0ec DK |
3373 | { |
3374 | int ret, err; | |
3375 | handle_t *handle; | |
3376 | ||
3377 | /* Data block + inode block */ | |
617ba13b | 3378 | handle = ext4_journal_start(sb->s_root->d_inode, 2); |
ac27a0ec DK |
3379 | if (IS_ERR(handle)) |
3380 | return PTR_ERR(handle); | |
3381 | ret = dquot_commit_info(sb, type); | |
617ba13b | 3382 | err = ext4_journal_stop(handle); |
ac27a0ec DK |
3383 | if (!ret) |
3384 | ret = err; | |
3385 | return ret; | |
3386 | } | |
3387 | ||
3388 | /* | |
3389 | * Turn on quotas during mount time - we need to find | |
3390 | * the quota file and such... | |
3391 | */ | |
617ba13b | 3392 | static int ext4_quota_on_mount(struct super_block *sb, int type) |
ac27a0ec | 3393 | { |
617ba13b MC |
3394 | return vfs_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type], |
3395 | EXT4_SB(sb)->s_jquota_fmt, type); | |
ac27a0ec DK |
3396 | } |
3397 | ||
3398 | /* | |
3399 | * Standard function to be called on quota_on | |
3400 | */ | |
617ba13b | 3401 | static int ext4_quota_on(struct super_block *sb, int type, int format_id, |
6f28e087 | 3402 | char *path, int remount) |
ac27a0ec DK |
3403 | { |
3404 | int err; | |
3405 | struct nameidata nd; | |
3406 | ||
3407 | if (!test_opt(sb, QUOTA)) | |
3408 | return -EINVAL; | |
0623543b JK |
3409 | /* When remounting, no checks are needed and in fact, path is NULL */ |
3410 | if (remount) | |
6f28e087 | 3411 | return vfs_quota_on(sb, type, format_id, path, remount); |
0623543b | 3412 | |
ac27a0ec DK |
3413 | err = path_lookup(path, LOOKUP_FOLLOW, &nd); |
3414 | if (err) | |
3415 | return err; | |
0623543b | 3416 | |
ac27a0ec | 3417 | /* Quotafile not on the same filesystem? */ |
4ac91378 | 3418 | if (nd.path.mnt->mnt_sb != sb) { |
1d957f9b | 3419 | path_put(&nd.path); |
ac27a0ec DK |
3420 | return -EXDEV; |
3421 | } | |
0623543b JK |
3422 | /* Journaling quota? */ |
3423 | if (EXT4_SB(sb)->s_qf_names[type]) { | |
2b2d6d01 | 3424 | /* Quotafile not in fs root? */ |
0623543b JK |
3425 | if (nd.path.dentry->d_parent->d_inode != sb->s_root->d_inode) |
3426 | printk(KERN_WARNING | |
3427 | "EXT4-fs: Quota file not on filesystem root. " | |
3428 | "Journaled quota will not work.\n"); | |
2b2d6d01 | 3429 | } |
0623543b JK |
3430 | |
3431 | /* | |
3432 | * When we journal data on quota file, we have to flush journal to see | |
3433 | * all updates to the file when we bypass pagecache... | |
3434 | */ | |
3435 | if (ext4_should_journal_data(nd.path.dentry->d_inode)) { | |
3436 | /* | |
3437 | * We don't need to lock updates but journal_flush() could | |
3438 | * otherwise be livelocked... | |
3439 | */ | |
3440 | jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal); | |
3441 | jbd2_journal_flush(EXT4_SB(sb)->s_journal); | |
3442 | jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); | |
3443 | } | |
3444 | ||
77e69dac | 3445 | err = vfs_quota_on_path(sb, type, format_id, &nd.path); |
1d957f9b | 3446 | path_put(&nd.path); |
77e69dac | 3447 | return err; |
ac27a0ec DK |
3448 | } |
3449 | ||
3450 | /* Read data from quotafile - avoid pagecache and such because we cannot afford | |
3451 | * acquiring the locks... As quota files are never truncated and quota code | |
3452 | * itself serializes the operations (and noone else should touch the files) | |
3453 | * we don't have to be afraid of races */ | |
617ba13b | 3454 | static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data, |
ac27a0ec DK |
3455 | size_t len, loff_t off) |
3456 | { | |
3457 | struct inode *inode = sb_dqopt(sb)->files[type]; | |
725d26d3 | 3458 | ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb); |
ac27a0ec DK |
3459 | int err = 0; |
3460 | int offset = off & (sb->s_blocksize - 1); | |
3461 | int tocopy; | |
3462 | size_t toread; | |
3463 | struct buffer_head *bh; | |
3464 | loff_t i_size = i_size_read(inode); | |
3465 | ||
3466 | if (off > i_size) | |
3467 | return 0; | |
3468 | if (off+len > i_size) | |
3469 | len = i_size-off; | |
3470 | toread = len; | |
3471 | while (toread > 0) { | |
3472 | tocopy = sb->s_blocksize - offset < toread ? | |
3473 | sb->s_blocksize - offset : toread; | |
617ba13b | 3474 | bh = ext4_bread(NULL, inode, blk, 0, &err); |
ac27a0ec DK |
3475 | if (err) |
3476 | return err; | |
3477 | if (!bh) /* A hole? */ | |
3478 | memset(data, 0, tocopy); | |
3479 | else | |
3480 | memcpy(data, bh->b_data+offset, tocopy); | |
3481 | brelse(bh); | |
3482 | offset = 0; | |
3483 | toread -= tocopy; | |
3484 | data += tocopy; | |
3485 | blk++; | |
3486 | } | |
3487 | return len; | |
3488 | } | |
3489 | ||
3490 | /* Write to quotafile (we know the transaction is already started and has | |
3491 | * enough credits) */ | |
617ba13b | 3492 | static ssize_t ext4_quota_write(struct super_block *sb, int type, |
ac27a0ec DK |
3493 | const char *data, size_t len, loff_t off) |
3494 | { | |
3495 | struct inode *inode = sb_dqopt(sb)->files[type]; | |
725d26d3 | 3496 | ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb); |
ac27a0ec DK |
3497 | int err = 0; |
3498 | int offset = off & (sb->s_blocksize - 1); | |
3499 | int tocopy; | |
617ba13b | 3500 | int journal_quota = EXT4_SB(sb)->s_qf_names[type] != NULL; |
ac27a0ec DK |
3501 | size_t towrite = len; |
3502 | struct buffer_head *bh; | |
3503 | handle_t *handle = journal_current_handle(); | |
3504 | ||
9c3013e9 | 3505 | if (!handle) { |
e5f8eab8 | 3506 | printk(KERN_WARNING "EXT4-fs: Quota write (off=%llu, len=%llu)" |
9c3013e9 JK |
3507 | " cancelled because transaction is not started.\n", |
3508 | (unsigned long long)off, (unsigned long long)len); | |
3509 | return -EIO; | |
3510 | } | |
ac27a0ec DK |
3511 | mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA); |
3512 | while (towrite > 0) { | |
3513 | tocopy = sb->s_blocksize - offset < towrite ? | |
3514 | sb->s_blocksize - offset : towrite; | |
617ba13b | 3515 | bh = ext4_bread(handle, inode, blk, 1, &err); |
ac27a0ec DK |
3516 | if (!bh) |
3517 | goto out; | |
3518 | if (journal_quota) { | |
617ba13b | 3519 | err = ext4_journal_get_write_access(handle, bh); |
ac27a0ec DK |
3520 | if (err) { |
3521 | brelse(bh); | |
3522 | goto out; | |
3523 | } | |
3524 | } | |
3525 | lock_buffer(bh); | |
3526 | memcpy(bh->b_data+offset, data, tocopy); | |
3527 | flush_dcache_page(bh->b_page); | |
3528 | unlock_buffer(bh); | |
3529 | if (journal_quota) | |
617ba13b | 3530 | err = ext4_journal_dirty_metadata(handle, bh); |
ac27a0ec DK |
3531 | else { |
3532 | /* Always do at least ordered writes for quotas */ | |
678aaf48 | 3533 | err = ext4_jbd2_file_inode(handle, inode); |
ac27a0ec DK |
3534 | mark_buffer_dirty(bh); |
3535 | } | |
3536 | brelse(bh); | |
3537 | if (err) | |
3538 | goto out; | |
3539 | offset = 0; | |
3540 | towrite -= tocopy; | |
3541 | data += tocopy; | |
3542 | blk++; | |
3543 | } | |
3544 | out: | |
4d04e4fb JK |
3545 | if (len == towrite) { |
3546 | mutex_unlock(&inode->i_mutex); | |
ac27a0ec | 3547 | return err; |
4d04e4fb | 3548 | } |
ac27a0ec DK |
3549 | if (inode->i_size < off+len-towrite) { |
3550 | i_size_write(inode, off+len-towrite); | |
617ba13b | 3551 | EXT4_I(inode)->i_disksize = inode->i_size; |
ac27a0ec | 3552 | } |
ac27a0ec | 3553 | inode->i_mtime = inode->i_ctime = CURRENT_TIME; |
617ba13b | 3554 | ext4_mark_inode_dirty(handle, inode); |
ac27a0ec DK |
3555 | mutex_unlock(&inode->i_mutex); |
3556 | return len - towrite; | |
3557 | } | |
3558 | ||
3559 | #endif | |
3560 | ||
617ba13b | 3561 | static int ext4_get_sb(struct file_system_type *fs_type, |
ac27a0ec DK |
3562 | int flags, const char *dev_name, void *data, struct vfsmount *mnt) |
3563 | { | |
617ba13b | 3564 | return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super, mnt); |
ac27a0ec DK |
3565 | } |
3566 | ||
5e8814f2 TT |
3567 | #ifdef CONFIG_PROC_FS |
3568 | static int ext4_ui_proc_show(struct seq_file *m, void *v) | |
3569 | { | |
3570 | unsigned int *p = m->private; | |
3571 | ||
3572 | seq_printf(m, "%u\n", *p); | |
3573 | return 0; | |
3574 | } | |
3575 | ||
3576 | static int ext4_ui_proc_open(struct inode *inode, struct file *file) | |
3577 | { | |
3578 | return single_open(file, ext4_ui_proc_show, PDE(inode)->data); | |
3579 | } | |
3580 | ||
3581 | static ssize_t ext4_ui_proc_write(struct file *file, const char __user *buf, | |
3582 | size_t cnt, loff_t *ppos) | |
3583 | { | |
3584 | unsigned int *p = PDE(file->f_path.dentry->d_inode)->data; | |
3585 | char str[32]; | |
3586 | unsigned long value; | |
3587 | ||
3588 | if (cnt >= sizeof(str)) | |
3589 | return -EINVAL; | |
3590 | if (copy_from_user(str, buf, cnt)) | |
3591 | return -EFAULT; | |
3592 | value = simple_strtol(str, NULL, 0); | |
3593 | if (value < 0) | |
3594 | return -ERANGE; | |
3595 | *p = value; | |
3596 | return cnt; | |
3597 | } | |
3598 | ||
3599 | const struct file_operations ext4_ui_proc_fops = { | |
3600 | .owner = THIS_MODULE, | |
3601 | .open = ext4_ui_proc_open, | |
3602 | .read = seq_read, | |
3603 | .llseek = seq_lseek, | |
3604 | .release = single_release, | |
3605 | .write = ext4_ui_proc_write, | |
3606 | }; | |
3607 | #endif | |
3608 | ||
617ba13b | 3609 | static struct file_system_type ext4dev_fs_type = { |
ac27a0ec | 3610 | .owner = THIS_MODULE, |
617ba13b MC |
3611 | .name = "ext4dev", |
3612 | .get_sb = ext4_get_sb, | |
ac27a0ec DK |
3613 | .kill_sb = kill_block_super, |
3614 | .fs_flags = FS_REQUIRES_DEV, | |
3615 | }; | |
3616 | ||
617ba13b | 3617 | static int __init init_ext4_fs(void) |
ac27a0ec | 3618 | { |
c9de560d AT |
3619 | int err; |
3620 | ||
9f6200bb | 3621 | ext4_proc_root = proc_mkdir("fs/ext4", NULL); |
c9de560d | 3622 | err = init_ext4_mballoc(); |
ac27a0ec DK |
3623 | if (err) |
3624 | return err; | |
c9de560d AT |
3625 | |
3626 | err = init_ext4_xattr(); | |
3627 | if (err) | |
3628 | goto out2; | |
ac27a0ec DK |
3629 | err = init_inodecache(); |
3630 | if (err) | |
3631 | goto out1; | |
63f57933 | 3632 | err = register_filesystem(&ext4dev_fs_type); |
ac27a0ec DK |
3633 | if (err) |
3634 | goto out; | |
3635 | return 0; | |
3636 | out: | |
3637 | destroy_inodecache(); | |
3638 | out1: | |
617ba13b | 3639 | exit_ext4_xattr(); |
c9de560d AT |
3640 | out2: |
3641 | exit_ext4_mballoc(); | |
ac27a0ec DK |
3642 | return err; |
3643 | } | |
3644 | ||
617ba13b | 3645 | static void __exit exit_ext4_fs(void) |
ac27a0ec | 3646 | { |
617ba13b | 3647 | unregister_filesystem(&ext4dev_fs_type); |
ac27a0ec | 3648 | destroy_inodecache(); |
617ba13b | 3649 | exit_ext4_xattr(); |
c9de560d | 3650 | exit_ext4_mballoc(); |
9f6200bb | 3651 | remove_proc_entry("fs/ext4", NULL); |
ac27a0ec DK |
3652 | } |
3653 | ||
3654 | MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others"); | |
617ba13b | 3655 | MODULE_DESCRIPTION("Fourth Extended Filesystem with extents"); |
ac27a0ec | 3656 | MODULE_LICENSE("GPL"); |
617ba13b MC |
3657 | module_init(init_ext4_fs) |
3658 | module_exit(exit_ext4_fs) |