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1 | /* | |
2 | * linux/fs/ext4/super.c | |
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> | |
23 | #include <linux/vmalloc.h> | |
24 | #include <linux/jbd2.h> | |
25 | #include <linux/slab.h> | |
26 | #include <linux/init.h> | |
27 | #include <linux/blkdev.h> | |
28 | #include <linux/parser.h> | |
29 | #include <linux/buffer_head.h> | |
30 | #include <linux/exportfs.h> | |
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> | |
37 | #include <linux/proc_fs.h> | |
38 | #include <linux/ctype.h> | |
39 | #include <linux/log2.h> | |
40 | #include <linux/crc16.h> | |
41 | #include <asm/uaccess.h> | |
42 | ||
43 | #include <linux/kthread.h> | |
44 | #include <linux/freezer.h> | |
45 | ||
46 | #include "ext4.h" | |
47 | #include "ext4_jbd2.h" | |
48 | #include "xattr.h" | |
49 | #include "acl.h" | |
50 | #include "mballoc.h" | |
51 | ||
52 | #define CREATE_TRACE_POINTS | |
53 | #include <trace/events/ext4.h> | |
54 | ||
55 | static struct proc_dir_entry *ext4_proc_root; | |
56 | static struct kset *ext4_kset; | |
57 | struct ext4_lazy_init *ext4_li_info; | |
58 | struct mutex ext4_li_mtx; | |
59 | struct ext4_features *ext4_feat; | |
60 | ||
61 | static int ext4_load_journal(struct super_block *, struct ext4_super_block *, | |
62 | unsigned long journal_devnum); | |
63 | static int ext4_commit_super(struct super_block *sb, int sync); | |
64 | static void ext4_mark_recovery_complete(struct super_block *sb, | |
65 | struct ext4_super_block *es); | |
66 | static void ext4_clear_journal_err(struct super_block *sb, | |
67 | struct ext4_super_block *es); | |
68 | static int ext4_sync_fs(struct super_block *sb, int wait); | |
69 | static const char *ext4_decode_error(struct super_block *sb, int errno, | |
70 | char nbuf[16]); | |
71 | static int ext4_remount(struct super_block *sb, int *flags, char *data); | |
72 | static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf); | |
73 | static int ext4_unfreeze(struct super_block *sb); | |
74 | static void ext4_write_super(struct super_block *sb); | |
75 | static int ext4_freeze(struct super_block *sb); | |
76 | static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags, | |
77 | const char *dev_name, void *data); | |
78 | static void ext4_destroy_lazyinit_thread(void); | |
79 | static void ext4_unregister_li_request(struct super_block *sb); | |
80 | ||
81 | #if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23) | |
82 | static struct file_system_type ext3_fs_type = { | |
83 | .owner = THIS_MODULE, | |
84 | .name = "ext3", | |
85 | .mount = ext4_mount, | |
86 | .kill_sb = kill_block_super, | |
87 | .fs_flags = FS_REQUIRES_DEV, | |
88 | }; | |
89 | #define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type) | |
90 | #else | |
91 | #define IS_EXT3_SB(sb) (0) | |
92 | #endif | |
93 | ||
94 | ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, | |
95 | struct ext4_group_desc *bg) | |
96 | { | |
97 | return le32_to_cpu(bg->bg_block_bitmap_lo) | | |
98 | (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? | |
99 | (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0); | |
100 | } | |
101 | ||
102 | ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, | |
103 | struct ext4_group_desc *bg) | |
104 | { | |
105 | return le32_to_cpu(bg->bg_inode_bitmap_lo) | | |
106 | (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? | |
107 | (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0); | |
108 | } | |
109 | ||
110 | ext4_fsblk_t ext4_inode_table(struct super_block *sb, | |
111 | struct ext4_group_desc *bg) | |
112 | { | |
113 | return le32_to_cpu(bg->bg_inode_table_lo) | | |
114 | (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? | |
115 | (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0); | |
116 | } | |
117 | ||
118 | __u32 ext4_free_blks_count(struct super_block *sb, | |
119 | struct ext4_group_desc *bg) | |
120 | { | |
121 | return le16_to_cpu(bg->bg_free_blocks_count_lo) | | |
122 | (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? | |
123 | (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0); | |
124 | } | |
125 | ||
126 | __u32 ext4_free_inodes_count(struct super_block *sb, | |
127 | struct ext4_group_desc *bg) | |
128 | { | |
129 | return le16_to_cpu(bg->bg_free_inodes_count_lo) | | |
130 | (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? | |
131 | (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0); | |
132 | } | |
133 | ||
134 | __u32 ext4_used_dirs_count(struct super_block *sb, | |
135 | struct ext4_group_desc *bg) | |
136 | { | |
137 | return le16_to_cpu(bg->bg_used_dirs_count_lo) | | |
138 | (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? | |
139 | (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0); | |
140 | } | |
141 | ||
142 | __u32 ext4_itable_unused_count(struct super_block *sb, | |
143 | struct ext4_group_desc *bg) | |
144 | { | |
145 | return le16_to_cpu(bg->bg_itable_unused_lo) | | |
146 | (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? | |
147 | (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0); | |
148 | } | |
149 | ||
150 | void ext4_block_bitmap_set(struct super_block *sb, | |
151 | struct ext4_group_desc *bg, ext4_fsblk_t blk) | |
152 | { | |
153 | bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk); | |
154 | if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) | |
155 | bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32); | |
156 | } | |
157 | ||
158 | void ext4_inode_bitmap_set(struct super_block *sb, | |
159 | struct ext4_group_desc *bg, ext4_fsblk_t blk) | |
160 | { | |
161 | bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk); | |
162 | if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) | |
163 | bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32); | |
164 | } | |
165 | ||
166 | void ext4_inode_table_set(struct super_block *sb, | |
167 | struct ext4_group_desc *bg, ext4_fsblk_t blk) | |
168 | { | |
169 | bg->bg_inode_table_lo = cpu_to_le32((u32)blk); | |
170 | if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) | |
171 | bg->bg_inode_table_hi = cpu_to_le32(blk >> 32); | |
172 | } | |
173 | ||
174 | void ext4_free_blks_set(struct super_block *sb, | |
175 | struct ext4_group_desc *bg, __u32 count) | |
176 | { | |
177 | bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count); | |
178 | if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) | |
179 | bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16); | |
180 | } | |
181 | ||
182 | void ext4_free_inodes_set(struct super_block *sb, | |
183 | struct ext4_group_desc *bg, __u32 count) | |
184 | { | |
185 | bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count); | |
186 | if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) | |
187 | bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16); | |
188 | } | |
189 | ||
190 | void ext4_used_dirs_set(struct super_block *sb, | |
191 | struct ext4_group_desc *bg, __u32 count) | |
192 | { | |
193 | bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count); | |
194 | if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) | |
195 | bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16); | |
196 | } | |
197 | ||
198 | void ext4_itable_unused_set(struct super_block *sb, | |
199 | struct ext4_group_desc *bg, __u32 count) | |
200 | { | |
201 | bg->bg_itable_unused_lo = cpu_to_le16((__u16)count); | |
202 | if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) | |
203 | bg->bg_itable_unused_hi = cpu_to_le16(count >> 16); | |
204 | } | |
205 | ||
206 | ||
207 | /* Just increment the non-pointer handle value */ | |
208 | static handle_t *ext4_get_nojournal(void) | |
209 | { | |
210 | handle_t *handle = current->journal_info; | |
211 | unsigned long ref_cnt = (unsigned long)handle; | |
212 | ||
213 | BUG_ON(ref_cnt >= EXT4_NOJOURNAL_MAX_REF_COUNT); | |
214 | ||
215 | ref_cnt++; | |
216 | handle = (handle_t *)ref_cnt; | |
217 | ||
218 | current->journal_info = handle; | |
219 | return handle; | |
220 | } | |
221 | ||
222 | ||
223 | /* Decrement the non-pointer handle value */ | |
224 | static void ext4_put_nojournal(handle_t *handle) | |
225 | { | |
226 | unsigned long ref_cnt = (unsigned long)handle; | |
227 | ||
228 | BUG_ON(ref_cnt == 0); | |
229 | ||
230 | ref_cnt--; | |
231 | handle = (handle_t *)ref_cnt; | |
232 | ||
233 | current->journal_info = handle; | |
234 | } | |
235 | ||
236 | /* | |
237 | * Wrappers for jbd2_journal_start/end. | |
238 | * | |
239 | * The only special thing we need to do here is to make sure that all | |
240 | * journal_end calls result in the superblock being marked dirty, so | |
241 | * that sync() will call the filesystem's write_super callback if | |
242 | * appropriate. | |
243 | */ | |
244 | handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks) | |
245 | { | |
246 | journal_t *journal; | |
247 | ||
248 | if (sb->s_flags & MS_RDONLY) | |
249 | return ERR_PTR(-EROFS); | |
250 | ||
251 | vfs_check_frozen(sb, SB_FREEZE_TRANS); | |
252 | /* Special case here: if the journal has aborted behind our | |
253 | * backs (eg. EIO in the commit thread), then we still need to | |
254 | * take the FS itself readonly cleanly. */ | |
255 | journal = EXT4_SB(sb)->s_journal; | |
256 | if (journal) { | |
257 | if (is_journal_aborted(journal)) { | |
258 | ext4_abort(sb, "Detected aborted journal"); | |
259 | return ERR_PTR(-EROFS); | |
260 | } | |
261 | return jbd2_journal_start(journal, nblocks); | |
262 | } | |
263 | return ext4_get_nojournal(); | |
264 | } | |
265 | ||
266 | /* | |
267 | * The only special thing we need to do here is to make sure that all | |
268 | * jbd2_journal_stop calls result in the superblock being marked dirty, so | |
269 | * that sync() will call the filesystem's write_super callback if | |
270 | * appropriate. | |
271 | */ | |
272 | int __ext4_journal_stop(const char *where, unsigned int line, handle_t *handle) | |
273 | { | |
274 | struct super_block *sb; | |
275 | int err; | |
276 | int rc; | |
277 | ||
278 | if (!ext4_handle_valid(handle)) { | |
279 | ext4_put_nojournal(handle); | |
280 | return 0; | |
281 | } | |
282 | sb = handle->h_transaction->t_journal->j_private; | |
283 | err = handle->h_err; | |
284 | rc = jbd2_journal_stop(handle); | |
285 | ||
286 | if (!err) | |
287 | err = rc; | |
288 | if (err) | |
289 | __ext4_std_error(sb, where, line, err); | |
290 | return err; | |
291 | } | |
292 | ||
293 | void ext4_journal_abort_handle(const char *caller, unsigned int line, | |
294 | const char *err_fn, struct buffer_head *bh, | |
295 | handle_t *handle, int err) | |
296 | { | |
297 | char nbuf[16]; | |
298 | const char *errstr = ext4_decode_error(NULL, err, nbuf); | |
299 | ||
300 | BUG_ON(!ext4_handle_valid(handle)); | |
301 | ||
302 | if (bh) | |
303 | BUFFER_TRACE(bh, "abort"); | |
304 | ||
305 | if (!handle->h_err) | |
306 | handle->h_err = err; | |
307 | ||
308 | if (is_handle_aborted(handle)) | |
309 | return; | |
310 | ||
311 | printk(KERN_ERR "%s:%d: aborting transaction: %s in %s\n", | |
312 | caller, line, errstr, err_fn); | |
313 | ||
314 | jbd2_journal_abort_handle(handle); | |
315 | } | |
316 | ||
317 | static void __save_error_info(struct super_block *sb, const char *func, | |
318 | unsigned int line) | |
319 | { | |
320 | struct ext4_super_block *es = EXT4_SB(sb)->s_es; | |
321 | ||
322 | EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; | |
323 | es->s_state |= cpu_to_le16(EXT4_ERROR_FS); | |
324 | es->s_last_error_time = cpu_to_le32(get_seconds()); | |
325 | strncpy(es->s_last_error_func, func, sizeof(es->s_last_error_func)); | |
326 | es->s_last_error_line = cpu_to_le32(line); | |
327 | if (!es->s_first_error_time) { | |
328 | es->s_first_error_time = es->s_last_error_time; | |
329 | strncpy(es->s_first_error_func, func, | |
330 | sizeof(es->s_first_error_func)); | |
331 | es->s_first_error_line = cpu_to_le32(line); | |
332 | es->s_first_error_ino = es->s_last_error_ino; | |
333 | es->s_first_error_block = es->s_last_error_block; | |
334 | } | |
335 | /* | |
336 | * Start the daily error reporting function if it hasn't been | |
337 | * started already | |
338 | */ | |
339 | if (!es->s_error_count) | |
340 | mod_timer(&EXT4_SB(sb)->s_err_report, jiffies + 24*60*60*HZ); | |
341 | es->s_error_count = cpu_to_le32(le32_to_cpu(es->s_error_count) + 1); | |
342 | } | |
343 | ||
344 | static void save_error_info(struct super_block *sb, const char *func, | |
345 | unsigned int line) | |
346 | { | |
347 | __save_error_info(sb, func, line); | |
348 | ext4_commit_super(sb, 1); | |
349 | } | |
350 | ||
351 | ||
352 | /* Deal with the reporting of failure conditions on a filesystem such as | |
353 | * inconsistencies detected or read IO failures. | |
354 | * | |
355 | * On ext2, we can store the error state of the filesystem in the | |
356 | * superblock. That is not possible on ext4, because we may have other | |
357 | * write ordering constraints on the superblock which prevent us from | |
358 | * writing it out straight away; and given that the journal is about to | |
359 | * be aborted, we can't rely on the current, or future, transactions to | |
360 | * write out the superblock safely. | |
361 | * | |
362 | * We'll just use the jbd2_journal_abort() error code to record an error in | |
363 | * the journal instead. On recovery, the journal will complain about | |
364 | * that error until we've noted it down and cleared it. | |
365 | */ | |
366 | ||
367 | static void ext4_handle_error(struct super_block *sb) | |
368 | { | |
369 | if (sb->s_flags & MS_RDONLY) | |
370 | return; | |
371 | ||
372 | if (!test_opt(sb, ERRORS_CONT)) { | |
373 | journal_t *journal = EXT4_SB(sb)->s_journal; | |
374 | ||
375 | EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED; | |
376 | if (journal) | |
377 | jbd2_journal_abort(journal, -EIO); | |
378 | } | |
379 | if (test_opt(sb, ERRORS_RO)) { | |
380 | ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only"); | |
381 | sb->s_flags |= MS_RDONLY; | |
382 | } | |
383 | if (test_opt(sb, ERRORS_PANIC)) | |
384 | panic("EXT4-fs (device %s): panic forced after error\n", | |
385 | sb->s_id); | |
386 | } | |
387 | ||
388 | void __ext4_error(struct super_block *sb, const char *function, | |
389 | unsigned int line, const char *fmt, ...) | |
390 | { | |
391 | va_list args; | |
392 | ||
393 | va_start(args, fmt); | |
394 | printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: comm %s: ", | |
395 | sb->s_id, function, line, current->comm); | |
396 | vprintk(fmt, args); | |
397 | printk("\n"); | |
398 | va_end(args); | |
399 | ||
400 | ext4_handle_error(sb); | |
401 | } | |
402 | ||
403 | void ext4_error_inode(struct inode *inode, const char *function, | |
404 | unsigned int line, ext4_fsblk_t block, | |
405 | const char *fmt, ...) | |
406 | { | |
407 | va_list args; | |
408 | struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es; | |
409 | ||
410 | es->s_last_error_ino = cpu_to_le32(inode->i_ino); | |
411 | es->s_last_error_block = cpu_to_le64(block); | |
412 | save_error_info(inode->i_sb, function, line); | |
413 | va_start(args, fmt); | |
414 | printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: inode #%lu: ", | |
415 | inode->i_sb->s_id, function, line, inode->i_ino); | |
416 | if (block) | |
417 | printk("block %llu: ", block); | |
418 | printk("comm %s: ", current->comm); | |
419 | vprintk(fmt, args); | |
420 | printk("\n"); | |
421 | va_end(args); | |
422 | ||
423 | ext4_handle_error(inode->i_sb); | |
424 | } | |
425 | ||
426 | void ext4_error_file(struct file *file, const char *function, | |
427 | unsigned int line, const char *fmt, ...) | |
428 | { | |
429 | va_list args; | |
430 | struct ext4_super_block *es; | |
431 | struct inode *inode = file->f_dentry->d_inode; | |
432 | char pathname[80], *path; | |
433 | ||
434 | es = EXT4_SB(inode->i_sb)->s_es; | |
435 | es->s_last_error_ino = cpu_to_le32(inode->i_ino); | |
436 | save_error_info(inode->i_sb, function, line); | |
437 | va_start(args, fmt); | |
438 | path = d_path(&(file->f_path), pathname, sizeof(pathname)); | |
439 | if (!path) | |
440 | path = "(unknown)"; | |
441 | printk(KERN_CRIT | |
442 | "EXT4-fs error (device %s): %s:%d: inode #%lu " | |
443 | "(comm %s path %s): ", | |
444 | inode->i_sb->s_id, function, line, inode->i_ino, | |
445 | current->comm, path); | |
446 | vprintk(fmt, args); | |
447 | printk("\n"); | |
448 | va_end(args); | |
449 | ||
450 | ext4_handle_error(inode->i_sb); | |
451 | } | |
452 | ||
453 | static const char *ext4_decode_error(struct super_block *sb, int errno, | |
454 | char nbuf[16]) | |
455 | { | |
456 | char *errstr = NULL; | |
457 | ||
458 | switch (errno) { | |
459 | case -EIO: | |
460 | errstr = "IO failure"; | |
461 | break; | |
462 | case -ENOMEM: | |
463 | errstr = "Out of memory"; | |
464 | break; | |
465 | case -EROFS: | |
466 | if (!sb || (EXT4_SB(sb)->s_journal && | |
467 | EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT)) | |
468 | errstr = "Journal has aborted"; | |
469 | else | |
470 | errstr = "Readonly filesystem"; | |
471 | break; | |
472 | default: | |
473 | /* If the caller passed in an extra buffer for unknown | |
474 | * errors, textualise them now. Else we just return | |
475 | * NULL. */ | |
476 | if (nbuf) { | |
477 | /* Check for truncated error codes... */ | |
478 | if (snprintf(nbuf, 16, "error %d", -errno) >= 0) | |
479 | errstr = nbuf; | |
480 | } | |
481 | break; | |
482 | } | |
483 | ||
484 | return errstr; | |
485 | } | |
486 | ||
487 | /* __ext4_std_error decodes expected errors from journaling functions | |
488 | * automatically and invokes the appropriate error response. */ | |
489 | ||
490 | void __ext4_std_error(struct super_block *sb, const char *function, | |
491 | unsigned int line, int errno) | |
492 | { | |
493 | char nbuf[16]; | |
494 | const char *errstr; | |
495 | ||
496 | /* Special case: if the error is EROFS, and we're not already | |
497 | * inside a transaction, then there's really no point in logging | |
498 | * an error. */ | |
499 | if (errno == -EROFS && journal_current_handle() == NULL && | |
500 | (sb->s_flags & MS_RDONLY)) | |
501 | return; | |
502 | ||
503 | errstr = ext4_decode_error(sb, errno, nbuf); | |
504 | printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n", | |
505 | sb->s_id, function, line, errstr); | |
506 | save_error_info(sb, function, line); | |
507 | ||
508 | ext4_handle_error(sb); | |
509 | } | |
510 | ||
511 | /* | |
512 | * ext4_abort is a much stronger failure handler than ext4_error. The | |
513 | * abort function may be used to deal with unrecoverable failures such | |
514 | * as journal IO errors or ENOMEM at a critical moment in log management. | |
515 | * | |
516 | * We unconditionally force the filesystem into an ABORT|READONLY state, | |
517 | * unless the error response on the fs has been set to panic in which | |
518 | * case we take the easy way out and panic immediately. | |
519 | */ | |
520 | ||
521 | void __ext4_abort(struct super_block *sb, const char *function, | |
522 | unsigned int line, const char *fmt, ...) | |
523 | { | |
524 | va_list args; | |
525 | ||
526 | save_error_info(sb, function, line); | |
527 | va_start(args, fmt); | |
528 | printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: ", sb->s_id, | |
529 | function, line); | |
530 | vprintk(fmt, args); | |
531 | printk("\n"); | |
532 | va_end(args); | |
533 | ||
534 | if ((sb->s_flags & MS_RDONLY) == 0) { | |
535 | ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only"); | |
536 | sb->s_flags |= MS_RDONLY; | |
537 | EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED; | |
538 | if (EXT4_SB(sb)->s_journal) | |
539 | jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO); | |
540 | save_error_info(sb, function, line); | |
541 | } | |
542 | if (test_opt(sb, ERRORS_PANIC)) | |
543 | panic("EXT4-fs panic from previous error\n"); | |
544 | } | |
545 | ||
546 | void ext4_msg (struct super_block * sb, const char *prefix, | |
547 | const char *fmt, ...) | |
548 | { | |
549 | va_list args; | |
550 | ||
551 | va_start(args, fmt); | |
552 | printk("%sEXT4-fs (%s): ", prefix, sb->s_id); | |
553 | vprintk(fmt, args); | |
554 | printk("\n"); | |
555 | va_end(args); | |
556 | } | |
557 | ||
558 | void __ext4_warning(struct super_block *sb, const char *function, | |
559 | unsigned int line, const char *fmt, ...) | |
560 | { | |
561 | va_list args; | |
562 | ||
563 | va_start(args, fmt); | |
564 | printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: ", | |
565 | sb->s_id, function, line); | |
566 | vprintk(fmt, args); | |
567 | printk("\n"); | |
568 | va_end(args); | |
569 | } | |
570 | ||
571 | void __ext4_grp_locked_error(const char *function, unsigned int line, | |
572 | struct super_block *sb, ext4_group_t grp, | |
573 | unsigned long ino, ext4_fsblk_t block, | |
574 | const char *fmt, ...) | |
575 | __releases(bitlock) | |
576 | __acquires(bitlock) | |
577 | { | |
578 | va_list args; | |
579 | struct ext4_super_block *es = EXT4_SB(sb)->s_es; | |
580 | ||
581 | es->s_last_error_ino = cpu_to_le32(ino); | |
582 | es->s_last_error_block = cpu_to_le64(block); | |
583 | __save_error_info(sb, function, line); | |
584 | va_start(args, fmt); | |
585 | printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u", | |
586 | sb->s_id, function, line, grp); | |
587 | if (ino) | |
588 | printk("inode %lu: ", ino); | |
589 | if (block) | |
590 | printk("block %llu:", (unsigned long long) block); | |
591 | vprintk(fmt, args); | |
592 | printk("\n"); | |
593 | va_end(args); | |
594 | ||
595 | if (test_opt(sb, ERRORS_CONT)) { | |
596 | ext4_commit_super(sb, 0); | |
597 | return; | |
598 | } | |
599 | ||
600 | ext4_unlock_group(sb, grp); | |
601 | ext4_handle_error(sb); | |
602 | /* | |
603 | * We only get here in the ERRORS_RO case; relocking the group | |
604 | * may be dangerous, but nothing bad will happen since the | |
605 | * filesystem will have already been marked read/only and the | |
606 | * journal has been aborted. We return 1 as a hint to callers | |
607 | * who might what to use the return value from | |
608 | * ext4_grp_locked_error() to distinguish beween the | |
609 | * ERRORS_CONT and ERRORS_RO case, and perhaps return more | |
610 | * aggressively from the ext4 function in question, with a | |
611 | * more appropriate error code. | |
612 | */ | |
613 | ext4_lock_group(sb, grp); | |
614 | return; | |
615 | } | |
616 | ||
617 | void ext4_update_dynamic_rev(struct super_block *sb) | |
618 | { | |
619 | struct ext4_super_block *es = EXT4_SB(sb)->s_es; | |
620 | ||
621 | if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV) | |
622 | return; | |
623 | ||
624 | ext4_warning(sb, | |
625 | "updating to rev %d because of new feature flag, " | |
626 | "running e2fsck is recommended", | |
627 | EXT4_DYNAMIC_REV); | |
628 | ||
629 | es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO); | |
630 | es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE); | |
631 | es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV); | |
632 | /* leave es->s_feature_*compat flags alone */ | |
633 | /* es->s_uuid will be set by e2fsck if empty */ | |
634 | ||
635 | /* | |
636 | * The rest of the superblock fields should be zero, and if not it | |
637 | * means they are likely already in use, so leave them alone. We | |
638 | * can leave it up to e2fsck to clean up any inconsistencies there. | |
639 | */ | |
640 | } | |
641 | ||
642 | /* | |
643 | * Open the external journal device | |
644 | */ | |
645 | static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb) | |
646 | { | |
647 | struct block_device *bdev; | |
648 | char b[BDEVNAME_SIZE]; | |
649 | ||
650 | bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE); | |
651 | if (IS_ERR(bdev)) | |
652 | goto fail; | |
653 | return bdev; | |
654 | ||
655 | fail: | |
656 | ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld", | |
657 | __bdevname(dev, b), PTR_ERR(bdev)); | |
658 | return NULL; | |
659 | } | |
660 | ||
661 | /* | |
662 | * Release the journal device | |
663 | */ | |
664 | static int ext4_blkdev_put(struct block_device *bdev) | |
665 | { | |
666 | bd_release(bdev); | |
667 | return blkdev_put(bdev, FMODE_READ|FMODE_WRITE); | |
668 | } | |
669 | ||
670 | static int ext4_blkdev_remove(struct ext4_sb_info *sbi) | |
671 | { | |
672 | struct block_device *bdev; | |
673 | int ret = -ENODEV; | |
674 | ||
675 | bdev = sbi->journal_bdev; | |
676 | if (bdev) { | |
677 | ret = ext4_blkdev_put(bdev); | |
678 | sbi->journal_bdev = NULL; | |
679 | } | |
680 | return ret; | |
681 | } | |
682 | ||
683 | static inline struct inode *orphan_list_entry(struct list_head *l) | |
684 | { | |
685 | return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode; | |
686 | } | |
687 | ||
688 | static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi) | |
689 | { | |
690 | struct list_head *l; | |
691 | ||
692 | ext4_msg(sb, KERN_ERR, "sb orphan head is %d", | |
693 | le32_to_cpu(sbi->s_es->s_last_orphan)); | |
694 | ||
695 | printk(KERN_ERR "sb_info orphan list:\n"); | |
696 | list_for_each(l, &sbi->s_orphan) { | |
697 | struct inode *inode = orphan_list_entry(l); | |
698 | printk(KERN_ERR " " | |
699 | "inode %s:%lu at %p: mode %o, nlink %d, next %d\n", | |
700 | inode->i_sb->s_id, inode->i_ino, inode, | |
701 | inode->i_mode, inode->i_nlink, | |
702 | NEXT_ORPHAN(inode)); | |
703 | } | |
704 | } | |
705 | ||
706 | static void ext4_put_super(struct super_block *sb) | |
707 | { | |
708 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
709 | struct ext4_super_block *es = sbi->s_es; | |
710 | int i, err; | |
711 | ||
712 | ext4_unregister_li_request(sb); | |
713 | dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); | |
714 | ||
715 | flush_workqueue(sbi->dio_unwritten_wq); | |
716 | destroy_workqueue(sbi->dio_unwritten_wq); | |
717 | ||
718 | lock_super(sb); | |
719 | if (sb->s_dirt) | |
720 | ext4_commit_super(sb, 1); | |
721 | ||
722 | if (sbi->s_journal) { | |
723 | err = jbd2_journal_destroy(sbi->s_journal); | |
724 | sbi->s_journal = NULL; | |
725 | if (err < 0) | |
726 | ext4_abort(sb, "Couldn't clean up the journal"); | |
727 | } | |
728 | ||
729 | del_timer(&sbi->s_err_report); | |
730 | ext4_release_system_zone(sb); | |
731 | ext4_mb_release(sb); | |
732 | ext4_ext_release(sb); | |
733 | ext4_xattr_put_super(sb); | |
734 | ||
735 | if (!(sb->s_flags & MS_RDONLY)) { | |
736 | EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); | |
737 | es->s_state = cpu_to_le16(sbi->s_mount_state); | |
738 | ext4_commit_super(sb, 1); | |
739 | } | |
740 | if (sbi->s_proc) { | |
741 | remove_proc_entry(sb->s_id, ext4_proc_root); | |
742 | } | |
743 | kobject_del(&sbi->s_kobj); | |
744 | ||
745 | for (i = 0; i < sbi->s_gdb_count; i++) | |
746 | brelse(sbi->s_group_desc[i]); | |
747 | kfree(sbi->s_group_desc); | |
748 | if (is_vmalloc_addr(sbi->s_flex_groups)) | |
749 | vfree(sbi->s_flex_groups); | |
750 | else | |
751 | kfree(sbi->s_flex_groups); | |
752 | percpu_counter_destroy(&sbi->s_freeblocks_counter); | |
753 | percpu_counter_destroy(&sbi->s_freeinodes_counter); | |
754 | percpu_counter_destroy(&sbi->s_dirs_counter); | |
755 | percpu_counter_destroy(&sbi->s_dirtyblocks_counter); | |
756 | brelse(sbi->s_sbh); | |
757 | #ifdef CONFIG_QUOTA | |
758 | for (i = 0; i < MAXQUOTAS; i++) | |
759 | kfree(sbi->s_qf_names[i]); | |
760 | #endif | |
761 | ||
762 | /* Debugging code just in case the in-memory inode orphan list | |
763 | * isn't empty. The on-disk one can be non-empty if we've | |
764 | * detected an error and taken the fs readonly, but the | |
765 | * in-memory list had better be clean by this point. */ | |
766 | if (!list_empty(&sbi->s_orphan)) | |
767 | dump_orphan_list(sb, sbi); | |
768 | J_ASSERT(list_empty(&sbi->s_orphan)); | |
769 | ||
770 | invalidate_bdev(sb->s_bdev); | |
771 | if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) { | |
772 | /* | |
773 | * Invalidate the journal device's buffers. We don't want them | |
774 | * floating about in memory - the physical journal device may | |
775 | * hotswapped, and it breaks the `ro-after' testing code. | |
776 | */ | |
777 | sync_blockdev(sbi->journal_bdev); | |
778 | invalidate_bdev(sbi->journal_bdev); | |
779 | ext4_blkdev_remove(sbi); | |
780 | } | |
781 | sb->s_fs_info = NULL; | |
782 | /* | |
783 | * Now that we are completely done shutting down the | |
784 | * superblock, we need to actually destroy the kobject. | |
785 | */ | |
786 | unlock_super(sb); | |
787 | kobject_put(&sbi->s_kobj); | |
788 | wait_for_completion(&sbi->s_kobj_unregister); | |
789 | kfree(sbi->s_blockgroup_lock); | |
790 | kfree(sbi); | |
791 | } | |
792 | ||
793 | static struct kmem_cache *ext4_inode_cachep; | |
794 | ||
795 | /* | |
796 | * Called inside transaction, so use GFP_NOFS | |
797 | */ | |
798 | static struct inode *ext4_alloc_inode(struct super_block *sb) | |
799 | { | |
800 | struct ext4_inode_info *ei; | |
801 | ||
802 | ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS); | |
803 | if (!ei) | |
804 | return NULL; | |
805 | ||
806 | ei->vfs_inode.i_version = 1; | |
807 | ei->vfs_inode.i_data.writeback_index = 0; | |
808 | memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache)); | |
809 | INIT_LIST_HEAD(&ei->i_prealloc_list); | |
810 | spin_lock_init(&ei->i_prealloc_lock); | |
811 | /* | |
812 | * Note: We can be called before EXT4_SB(sb)->s_journal is set, | |
813 | * therefore it can be null here. Don't check it, just initialize | |
814 | * jinode. | |
815 | */ | |
816 | jbd2_journal_init_jbd_inode(&ei->jinode, &ei->vfs_inode); | |
817 | ei->i_reserved_data_blocks = 0; | |
818 | ei->i_reserved_meta_blocks = 0; | |
819 | ei->i_allocated_meta_blocks = 0; | |
820 | ei->i_da_metadata_calc_len = 0; | |
821 | ei->i_delalloc_reserved_flag = 0; | |
822 | spin_lock_init(&(ei->i_block_reservation_lock)); | |
823 | #ifdef CONFIG_QUOTA | |
824 | ei->i_reserved_quota = 0; | |
825 | #endif | |
826 | INIT_LIST_HEAD(&ei->i_completed_io_list); | |
827 | spin_lock_init(&ei->i_completed_io_lock); | |
828 | ei->cur_aio_dio = NULL; | |
829 | ei->i_sync_tid = 0; | |
830 | ei->i_datasync_tid = 0; | |
831 | ||
832 | return &ei->vfs_inode; | |
833 | } | |
834 | ||
835 | static void ext4_destroy_inode(struct inode *inode) | |
836 | { | |
837 | if (!list_empty(&(EXT4_I(inode)->i_orphan))) { | |
838 | ext4_msg(inode->i_sb, KERN_ERR, | |
839 | "Inode %lu (%p): orphan list check failed!", | |
840 | inode->i_ino, EXT4_I(inode)); | |
841 | print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4, | |
842 | EXT4_I(inode), sizeof(struct ext4_inode_info), | |
843 | true); | |
844 | dump_stack(); | |
845 | } | |
846 | kmem_cache_free(ext4_inode_cachep, EXT4_I(inode)); | |
847 | } | |
848 | ||
849 | static void init_once(void *foo) | |
850 | { | |
851 | struct ext4_inode_info *ei = (struct ext4_inode_info *) foo; | |
852 | ||
853 | INIT_LIST_HEAD(&ei->i_orphan); | |
854 | #ifdef CONFIG_EXT4_FS_XATTR | |
855 | init_rwsem(&ei->xattr_sem); | |
856 | #endif | |
857 | init_rwsem(&ei->i_data_sem); | |
858 | inode_init_once(&ei->vfs_inode); | |
859 | } | |
860 | ||
861 | static int init_inodecache(void) | |
862 | { | |
863 | ext4_inode_cachep = kmem_cache_create("ext4_inode_cache", | |
864 | sizeof(struct ext4_inode_info), | |
865 | 0, (SLAB_RECLAIM_ACCOUNT| | |
866 | SLAB_MEM_SPREAD), | |
867 | init_once); | |
868 | if (ext4_inode_cachep == NULL) | |
869 | return -ENOMEM; | |
870 | return 0; | |
871 | } | |
872 | ||
873 | static void destroy_inodecache(void) | |
874 | { | |
875 | kmem_cache_destroy(ext4_inode_cachep); | |
876 | } | |
877 | ||
878 | void ext4_clear_inode(struct inode *inode) | |
879 | { | |
880 | invalidate_inode_buffers(inode); | |
881 | end_writeback(inode); | |
882 | dquot_drop(inode); | |
883 | ext4_discard_preallocations(inode); | |
884 | if (EXT4_JOURNAL(inode)) | |
885 | jbd2_journal_release_jbd_inode(EXT4_SB(inode->i_sb)->s_journal, | |
886 | &EXT4_I(inode)->jinode); | |
887 | } | |
888 | ||
889 | static inline void ext4_show_quota_options(struct seq_file *seq, | |
890 | struct super_block *sb) | |
891 | { | |
892 | #if defined(CONFIG_QUOTA) | |
893 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
894 | ||
895 | if (sbi->s_jquota_fmt) { | |
896 | char *fmtname = ""; | |
897 | ||
898 | switch (sbi->s_jquota_fmt) { | |
899 | case QFMT_VFS_OLD: | |
900 | fmtname = "vfsold"; | |
901 | break; | |
902 | case QFMT_VFS_V0: | |
903 | fmtname = "vfsv0"; | |
904 | break; | |
905 | case QFMT_VFS_V1: | |
906 | fmtname = "vfsv1"; | |
907 | break; | |
908 | } | |
909 | seq_printf(seq, ",jqfmt=%s", fmtname); | |
910 | } | |
911 | ||
912 | if (sbi->s_qf_names[USRQUOTA]) | |
913 | seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]); | |
914 | ||
915 | if (sbi->s_qf_names[GRPQUOTA]) | |
916 | seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]); | |
917 | ||
918 | if (test_opt(sb, USRQUOTA)) | |
919 | seq_puts(seq, ",usrquota"); | |
920 | ||
921 | if (test_opt(sb, GRPQUOTA)) | |
922 | seq_puts(seq, ",grpquota"); | |
923 | #endif | |
924 | } | |
925 | ||
926 | /* | |
927 | * Show an option if | |
928 | * - it's set to a non-default value OR | |
929 | * - if the per-sb default is different from the global default | |
930 | */ | |
931 | static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs) | |
932 | { | |
933 | int def_errors; | |
934 | unsigned long def_mount_opts; | |
935 | struct super_block *sb = vfs->mnt_sb; | |
936 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
937 | struct ext4_super_block *es = sbi->s_es; | |
938 | ||
939 | def_mount_opts = le32_to_cpu(es->s_default_mount_opts); | |
940 | def_errors = le16_to_cpu(es->s_errors); | |
941 | ||
942 | if (sbi->s_sb_block != 1) | |
943 | seq_printf(seq, ",sb=%llu", sbi->s_sb_block); | |
944 | if (test_opt(sb, MINIX_DF)) | |
945 | seq_puts(seq, ",minixdf"); | |
946 | if (test_opt(sb, GRPID) && !(def_mount_opts & EXT4_DEFM_BSDGROUPS)) | |
947 | seq_puts(seq, ",grpid"); | |
948 | if (!test_opt(sb, GRPID) && (def_mount_opts & EXT4_DEFM_BSDGROUPS)) | |
949 | seq_puts(seq, ",nogrpid"); | |
950 | if (sbi->s_resuid != EXT4_DEF_RESUID || | |
951 | le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID) { | |
952 | seq_printf(seq, ",resuid=%u", sbi->s_resuid); | |
953 | } | |
954 | if (sbi->s_resgid != EXT4_DEF_RESGID || | |
955 | le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID) { | |
956 | seq_printf(seq, ",resgid=%u", sbi->s_resgid); | |
957 | } | |
958 | if (test_opt(sb, ERRORS_RO)) { | |
959 | if (def_errors == EXT4_ERRORS_PANIC || | |
960 | def_errors == EXT4_ERRORS_CONTINUE) { | |
961 | seq_puts(seq, ",errors=remount-ro"); | |
962 | } | |
963 | } | |
964 | if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE) | |
965 | seq_puts(seq, ",errors=continue"); | |
966 | if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC) | |
967 | seq_puts(seq, ",errors=panic"); | |
968 | if (test_opt(sb, NO_UID32) && !(def_mount_opts & EXT4_DEFM_UID16)) | |
969 | seq_puts(seq, ",nouid32"); | |
970 | if (test_opt(sb, DEBUG) && !(def_mount_opts & EXT4_DEFM_DEBUG)) | |
971 | seq_puts(seq, ",debug"); | |
972 | if (test_opt(sb, OLDALLOC)) | |
973 | seq_puts(seq, ",oldalloc"); | |
974 | #ifdef CONFIG_EXT4_FS_XATTR | |
975 | if (test_opt(sb, XATTR_USER) && | |
976 | !(def_mount_opts & EXT4_DEFM_XATTR_USER)) | |
977 | seq_puts(seq, ",user_xattr"); | |
978 | if (!test_opt(sb, XATTR_USER) && | |
979 | (def_mount_opts & EXT4_DEFM_XATTR_USER)) { | |
980 | seq_puts(seq, ",nouser_xattr"); | |
981 | } | |
982 | #endif | |
983 | #ifdef CONFIG_EXT4_FS_POSIX_ACL | |
984 | if (test_opt(sb, POSIX_ACL) && !(def_mount_opts & EXT4_DEFM_ACL)) | |
985 | seq_puts(seq, ",acl"); | |
986 | if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT4_DEFM_ACL)) | |
987 | seq_puts(seq, ",noacl"); | |
988 | #endif | |
989 | if (sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) { | |
990 | seq_printf(seq, ",commit=%u", | |
991 | (unsigned) (sbi->s_commit_interval / HZ)); | |
992 | } | |
993 | if (sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME) { | |
994 | seq_printf(seq, ",min_batch_time=%u", | |
995 | (unsigned) sbi->s_min_batch_time); | |
996 | } | |
997 | if (sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME) { | |
998 | seq_printf(seq, ",max_batch_time=%u", | |
999 | (unsigned) sbi->s_min_batch_time); | |
1000 | } | |
1001 | ||
1002 | /* | |
1003 | * We're changing the default of barrier mount option, so | |
1004 | * let's always display its mount state so it's clear what its | |
1005 | * status is. | |
1006 | */ | |
1007 | seq_puts(seq, ",barrier="); | |
1008 | seq_puts(seq, test_opt(sb, BARRIER) ? "1" : "0"); | |
1009 | if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) | |
1010 | seq_puts(seq, ",journal_async_commit"); | |
1011 | else if (test_opt(sb, JOURNAL_CHECKSUM)) | |
1012 | seq_puts(seq, ",journal_checksum"); | |
1013 | if (test_opt(sb, I_VERSION)) | |
1014 | seq_puts(seq, ",i_version"); | |
1015 | if (!test_opt(sb, DELALLOC) && | |
1016 | !(def_mount_opts & EXT4_DEFM_NODELALLOC)) | |
1017 | seq_puts(seq, ",nodelalloc"); | |
1018 | ||
1019 | if (sbi->s_stripe) | |
1020 | seq_printf(seq, ",stripe=%lu", sbi->s_stripe); | |
1021 | /* | |
1022 | * journal mode get enabled in different ways | |
1023 | * So just print the value even if we didn't specify it | |
1024 | */ | |
1025 | if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) | |
1026 | seq_puts(seq, ",data=journal"); | |
1027 | else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) | |
1028 | seq_puts(seq, ",data=ordered"); | |
1029 | else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA) | |
1030 | seq_puts(seq, ",data=writeback"); | |
1031 | ||
1032 | if (sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS) | |
1033 | seq_printf(seq, ",inode_readahead_blks=%u", | |
1034 | sbi->s_inode_readahead_blks); | |
1035 | ||
1036 | if (test_opt(sb, DATA_ERR_ABORT)) | |
1037 | seq_puts(seq, ",data_err=abort"); | |
1038 | ||
1039 | if (test_opt(sb, NO_AUTO_DA_ALLOC)) | |
1040 | seq_puts(seq, ",noauto_da_alloc"); | |
1041 | ||
1042 | if (test_opt(sb, DISCARD) && !(def_mount_opts & EXT4_DEFM_DISCARD)) | |
1043 | seq_puts(seq, ",discard"); | |
1044 | ||
1045 | if (test_opt(sb, NOLOAD)) | |
1046 | seq_puts(seq, ",norecovery"); | |
1047 | ||
1048 | if (test_opt(sb, DIOREAD_NOLOCK)) | |
1049 | seq_puts(seq, ",dioread_nolock"); | |
1050 | ||
1051 | if (test_opt(sb, BLOCK_VALIDITY) && | |
1052 | !(def_mount_opts & EXT4_DEFM_BLOCK_VALIDITY)) | |
1053 | seq_puts(seq, ",block_validity"); | |
1054 | ||
1055 | if (!test_opt(sb, INIT_INODE_TABLE)) | |
1056 | seq_puts(seq, ",noinit_inode_table"); | |
1057 | else if (sbi->s_li_wait_mult) | |
1058 | seq_printf(seq, ",init_inode_table=%u", | |
1059 | (unsigned) sbi->s_li_wait_mult); | |
1060 | ||
1061 | ext4_show_quota_options(seq, sb); | |
1062 | ||
1063 | return 0; | |
1064 | } | |
1065 | ||
1066 | static struct inode *ext4_nfs_get_inode(struct super_block *sb, | |
1067 | u64 ino, u32 generation) | |
1068 | { | |
1069 | struct inode *inode; | |
1070 | ||
1071 | if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO) | |
1072 | return ERR_PTR(-ESTALE); | |
1073 | if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)) | |
1074 | return ERR_PTR(-ESTALE); | |
1075 | ||
1076 | /* iget isn't really right if the inode is currently unallocated!! | |
1077 | * | |
1078 | * ext4_read_inode will return a bad_inode if the inode had been | |
1079 | * deleted, so we should be safe. | |
1080 | * | |
1081 | * Currently we don't know the generation for parent directory, so | |
1082 | * a generation of 0 means "accept any" | |
1083 | */ | |
1084 | inode = ext4_iget(sb, ino); | |
1085 | if (IS_ERR(inode)) | |
1086 | return ERR_CAST(inode); | |
1087 | if (generation && inode->i_generation != generation) { | |
1088 | iput(inode); | |
1089 | return ERR_PTR(-ESTALE); | |
1090 | } | |
1091 | ||
1092 | return inode; | |
1093 | } | |
1094 | ||
1095 | static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid, | |
1096 | int fh_len, int fh_type) | |
1097 | { | |
1098 | return generic_fh_to_dentry(sb, fid, fh_len, fh_type, | |
1099 | ext4_nfs_get_inode); | |
1100 | } | |
1101 | ||
1102 | static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid, | |
1103 | int fh_len, int fh_type) | |
1104 | { | |
1105 | return generic_fh_to_parent(sb, fid, fh_len, fh_type, | |
1106 | ext4_nfs_get_inode); | |
1107 | } | |
1108 | ||
1109 | /* | |
1110 | * Try to release metadata pages (indirect blocks, directories) which are | |
1111 | * mapped via the block device. Since these pages could have journal heads | |
1112 | * which would prevent try_to_free_buffers() from freeing them, we must use | |
1113 | * jbd2 layer's try_to_free_buffers() function to release them. | |
1114 | */ | |
1115 | static int bdev_try_to_free_page(struct super_block *sb, struct page *page, | |
1116 | gfp_t wait) | |
1117 | { | |
1118 | journal_t *journal = EXT4_SB(sb)->s_journal; | |
1119 | ||
1120 | WARN_ON(PageChecked(page)); | |
1121 | if (!page_has_buffers(page)) | |
1122 | return 0; | |
1123 | if (journal) | |
1124 | return jbd2_journal_try_to_free_buffers(journal, page, | |
1125 | wait & ~__GFP_WAIT); | |
1126 | return try_to_free_buffers(page); | |
1127 | } | |
1128 | ||
1129 | #ifdef CONFIG_QUOTA | |
1130 | #define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group") | |
1131 | #define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA)) | |
1132 | ||
1133 | static int ext4_write_dquot(struct dquot *dquot); | |
1134 | static int ext4_acquire_dquot(struct dquot *dquot); | |
1135 | static int ext4_release_dquot(struct dquot *dquot); | |
1136 | static int ext4_mark_dquot_dirty(struct dquot *dquot); | |
1137 | static int ext4_write_info(struct super_block *sb, int type); | |
1138 | static int ext4_quota_on(struct super_block *sb, int type, int format_id, | |
1139 | char *path); | |
1140 | static int ext4_quota_off(struct super_block *sb, int type); | |
1141 | static int ext4_quota_on_mount(struct super_block *sb, int type); | |
1142 | static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data, | |
1143 | size_t len, loff_t off); | |
1144 | static ssize_t ext4_quota_write(struct super_block *sb, int type, | |
1145 | const char *data, size_t len, loff_t off); | |
1146 | ||
1147 | static const struct dquot_operations ext4_quota_operations = { | |
1148 | #ifdef CONFIG_QUOTA | |
1149 | .get_reserved_space = ext4_get_reserved_space, | |
1150 | #endif | |
1151 | .write_dquot = ext4_write_dquot, | |
1152 | .acquire_dquot = ext4_acquire_dquot, | |
1153 | .release_dquot = ext4_release_dquot, | |
1154 | .mark_dirty = ext4_mark_dquot_dirty, | |
1155 | .write_info = ext4_write_info, | |
1156 | .alloc_dquot = dquot_alloc, | |
1157 | .destroy_dquot = dquot_destroy, | |
1158 | }; | |
1159 | ||
1160 | static const struct quotactl_ops ext4_qctl_operations = { | |
1161 | .quota_on = ext4_quota_on, | |
1162 | .quota_off = ext4_quota_off, | |
1163 | .quota_sync = dquot_quota_sync, | |
1164 | .get_info = dquot_get_dqinfo, | |
1165 | .set_info = dquot_set_dqinfo, | |
1166 | .get_dqblk = dquot_get_dqblk, | |
1167 | .set_dqblk = dquot_set_dqblk | |
1168 | }; | |
1169 | #endif | |
1170 | ||
1171 | static const struct super_operations ext4_sops = { | |
1172 | .alloc_inode = ext4_alloc_inode, | |
1173 | .destroy_inode = ext4_destroy_inode, | |
1174 | .write_inode = ext4_write_inode, | |
1175 | .dirty_inode = ext4_dirty_inode, | |
1176 | .evict_inode = ext4_evict_inode, | |
1177 | .put_super = ext4_put_super, | |
1178 | .sync_fs = ext4_sync_fs, | |
1179 | .freeze_fs = ext4_freeze, | |
1180 | .unfreeze_fs = ext4_unfreeze, | |
1181 | .statfs = ext4_statfs, | |
1182 | .remount_fs = ext4_remount, | |
1183 | .show_options = ext4_show_options, | |
1184 | #ifdef CONFIG_QUOTA | |
1185 | .quota_read = ext4_quota_read, | |
1186 | .quota_write = ext4_quota_write, | |
1187 | #endif | |
1188 | .bdev_try_to_free_page = bdev_try_to_free_page, | |
1189 | .trim_fs = ext4_trim_fs | |
1190 | }; | |
1191 | ||
1192 | static const struct super_operations ext4_nojournal_sops = { | |
1193 | .alloc_inode = ext4_alloc_inode, | |
1194 | .destroy_inode = ext4_destroy_inode, | |
1195 | .write_inode = ext4_write_inode, | |
1196 | .dirty_inode = ext4_dirty_inode, | |
1197 | .evict_inode = ext4_evict_inode, | |
1198 | .write_super = ext4_write_super, | |
1199 | .put_super = ext4_put_super, | |
1200 | .statfs = ext4_statfs, | |
1201 | .remount_fs = ext4_remount, | |
1202 | .show_options = ext4_show_options, | |
1203 | #ifdef CONFIG_QUOTA | |
1204 | .quota_read = ext4_quota_read, | |
1205 | .quota_write = ext4_quota_write, | |
1206 | #endif | |
1207 | .bdev_try_to_free_page = bdev_try_to_free_page, | |
1208 | }; | |
1209 | ||
1210 | static const struct export_operations ext4_export_ops = { | |
1211 | .fh_to_dentry = ext4_fh_to_dentry, | |
1212 | .fh_to_parent = ext4_fh_to_parent, | |
1213 | .get_parent = ext4_get_parent, | |
1214 | }; | |
1215 | ||
1216 | enum { | |
1217 | Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid, | |
1218 | Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro, | |
1219 | Opt_nouid32, Opt_debug, Opt_oldalloc, Opt_orlov, | |
1220 | Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl, | |
1221 | Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload, Opt_nobh, Opt_bh, | |
1222 | Opt_commit, Opt_min_batch_time, Opt_max_batch_time, | |
1223 | Opt_journal_update, Opt_journal_dev, | |
1224 | Opt_journal_checksum, Opt_journal_async_commit, | |
1225 | Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback, | |
1226 | Opt_data_err_abort, Opt_data_err_ignore, | |
1227 | Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota, | |
1228 | Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota, | |
1229 | Opt_noquota, Opt_ignore, Opt_barrier, Opt_nobarrier, Opt_err, | |
1230 | Opt_resize, Opt_usrquota, Opt_grpquota, Opt_i_version, | |
1231 | Opt_stripe, Opt_delalloc, Opt_nodelalloc, | |
1232 | Opt_block_validity, Opt_noblock_validity, | |
1233 | Opt_inode_readahead_blks, Opt_journal_ioprio, | |
1234 | Opt_dioread_nolock, Opt_dioread_lock, | |
1235 | Opt_discard, Opt_nodiscard, | |
1236 | Opt_init_inode_table, Opt_noinit_inode_table, | |
1237 | }; | |
1238 | ||
1239 | static const match_table_t tokens = { | |
1240 | {Opt_bsd_df, "bsddf"}, | |
1241 | {Opt_minix_df, "minixdf"}, | |
1242 | {Opt_grpid, "grpid"}, | |
1243 | {Opt_grpid, "bsdgroups"}, | |
1244 | {Opt_nogrpid, "nogrpid"}, | |
1245 | {Opt_nogrpid, "sysvgroups"}, | |
1246 | {Opt_resgid, "resgid=%u"}, | |
1247 | {Opt_resuid, "resuid=%u"}, | |
1248 | {Opt_sb, "sb=%u"}, | |
1249 | {Opt_err_cont, "errors=continue"}, | |
1250 | {Opt_err_panic, "errors=panic"}, | |
1251 | {Opt_err_ro, "errors=remount-ro"}, | |
1252 | {Opt_nouid32, "nouid32"}, | |
1253 | {Opt_debug, "debug"}, | |
1254 | {Opt_oldalloc, "oldalloc"}, | |
1255 | {Opt_orlov, "orlov"}, | |
1256 | {Opt_user_xattr, "user_xattr"}, | |
1257 | {Opt_nouser_xattr, "nouser_xattr"}, | |
1258 | {Opt_acl, "acl"}, | |
1259 | {Opt_noacl, "noacl"}, | |
1260 | {Opt_noload, "noload"}, | |
1261 | {Opt_noload, "norecovery"}, | |
1262 | {Opt_nobh, "nobh"}, | |
1263 | {Opt_bh, "bh"}, | |
1264 | {Opt_commit, "commit=%u"}, | |
1265 | {Opt_min_batch_time, "min_batch_time=%u"}, | |
1266 | {Opt_max_batch_time, "max_batch_time=%u"}, | |
1267 | {Opt_journal_update, "journal=update"}, | |
1268 | {Opt_journal_dev, "journal_dev=%u"}, | |
1269 | {Opt_journal_checksum, "journal_checksum"}, | |
1270 | {Opt_journal_async_commit, "journal_async_commit"}, | |
1271 | {Opt_abort, "abort"}, | |
1272 | {Opt_data_journal, "data=journal"}, | |
1273 | {Opt_data_ordered, "data=ordered"}, | |
1274 | {Opt_data_writeback, "data=writeback"}, | |
1275 | {Opt_data_err_abort, "data_err=abort"}, | |
1276 | {Opt_data_err_ignore, "data_err=ignore"}, | |
1277 | {Opt_offusrjquota, "usrjquota="}, | |
1278 | {Opt_usrjquota, "usrjquota=%s"}, | |
1279 | {Opt_offgrpjquota, "grpjquota="}, | |
1280 | {Opt_grpjquota, "grpjquota=%s"}, | |
1281 | {Opt_jqfmt_vfsold, "jqfmt=vfsold"}, | |
1282 | {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"}, | |
1283 | {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"}, | |
1284 | {Opt_grpquota, "grpquota"}, | |
1285 | {Opt_noquota, "noquota"}, | |
1286 | {Opt_quota, "quota"}, | |
1287 | {Opt_usrquota, "usrquota"}, | |
1288 | {Opt_barrier, "barrier=%u"}, | |
1289 | {Opt_barrier, "barrier"}, | |
1290 | {Opt_nobarrier, "nobarrier"}, | |
1291 | {Opt_i_version, "i_version"}, | |
1292 | {Opt_stripe, "stripe=%u"}, | |
1293 | {Opt_resize, "resize"}, | |
1294 | {Opt_delalloc, "delalloc"}, | |
1295 | {Opt_nodelalloc, "nodelalloc"}, | |
1296 | {Opt_block_validity, "block_validity"}, | |
1297 | {Opt_noblock_validity, "noblock_validity"}, | |
1298 | {Opt_inode_readahead_blks, "inode_readahead_blks=%u"}, | |
1299 | {Opt_journal_ioprio, "journal_ioprio=%u"}, | |
1300 | {Opt_auto_da_alloc, "auto_da_alloc=%u"}, | |
1301 | {Opt_auto_da_alloc, "auto_da_alloc"}, | |
1302 | {Opt_noauto_da_alloc, "noauto_da_alloc"}, | |
1303 | {Opt_dioread_nolock, "dioread_nolock"}, | |
1304 | {Opt_dioread_lock, "dioread_lock"}, | |
1305 | {Opt_discard, "discard"}, | |
1306 | {Opt_nodiscard, "nodiscard"}, | |
1307 | {Opt_init_inode_table, "init_itable=%u"}, | |
1308 | {Opt_init_inode_table, "init_itable"}, | |
1309 | {Opt_noinit_inode_table, "noinit_itable"}, | |
1310 | {Opt_err, NULL}, | |
1311 | }; | |
1312 | ||
1313 | static ext4_fsblk_t get_sb_block(void **data) | |
1314 | { | |
1315 | ext4_fsblk_t sb_block; | |
1316 | char *options = (char *) *data; | |
1317 | ||
1318 | if (!options || strncmp(options, "sb=", 3) != 0) | |
1319 | return 1; /* Default location */ | |
1320 | ||
1321 | options += 3; | |
1322 | /* TODO: use simple_strtoll with >32bit ext4 */ | |
1323 | sb_block = simple_strtoul(options, &options, 0); | |
1324 | if (*options && *options != ',') { | |
1325 | printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n", | |
1326 | (char *) *data); | |
1327 | return 1; | |
1328 | } | |
1329 | if (*options == ',') | |
1330 | options++; | |
1331 | *data = (void *) options; | |
1332 | ||
1333 | return sb_block; | |
1334 | } | |
1335 | ||
1336 | #define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3)) | |
1337 | static char deprecated_msg[] = "Mount option \"%s\" will be removed by %s\n" | |
1338 | "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n"; | |
1339 | ||
1340 | #ifdef CONFIG_QUOTA | |
1341 | static int set_qf_name(struct super_block *sb, int qtype, substring_t *args) | |
1342 | { | |
1343 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
1344 | char *qname; | |
1345 | ||
1346 | if (sb_any_quota_loaded(sb) && | |
1347 | !sbi->s_qf_names[qtype]) { | |
1348 | ext4_msg(sb, KERN_ERR, | |
1349 | "Cannot change journaled " | |
1350 | "quota options when quota turned on"); | |
1351 | return 0; | |
1352 | } | |
1353 | qname = match_strdup(args); | |
1354 | if (!qname) { | |
1355 | ext4_msg(sb, KERN_ERR, | |
1356 | "Not enough memory for storing quotafile name"); | |
1357 | return 0; | |
1358 | } | |
1359 | if (sbi->s_qf_names[qtype] && | |
1360 | strcmp(sbi->s_qf_names[qtype], qname)) { | |
1361 | ext4_msg(sb, KERN_ERR, | |
1362 | "%s quota file already specified", QTYPE2NAME(qtype)); | |
1363 | kfree(qname); | |
1364 | return 0; | |
1365 | } | |
1366 | sbi->s_qf_names[qtype] = qname; | |
1367 | if (strchr(sbi->s_qf_names[qtype], '/')) { | |
1368 | ext4_msg(sb, KERN_ERR, | |
1369 | "quotafile must be on filesystem root"); | |
1370 | kfree(sbi->s_qf_names[qtype]); | |
1371 | sbi->s_qf_names[qtype] = NULL; | |
1372 | return 0; | |
1373 | } | |
1374 | set_opt(sbi->s_mount_opt, QUOTA); | |
1375 | return 1; | |
1376 | } | |
1377 | ||
1378 | static int clear_qf_name(struct super_block *sb, int qtype) | |
1379 | { | |
1380 | ||
1381 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
1382 | ||
1383 | if (sb_any_quota_loaded(sb) && | |
1384 | sbi->s_qf_names[qtype]) { | |
1385 | ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options" | |
1386 | " when quota turned on"); | |
1387 | return 0; | |
1388 | } | |
1389 | /* | |
1390 | * The space will be released later when all options are confirmed | |
1391 | * to be correct | |
1392 | */ | |
1393 | sbi->s_qf_names[qtype] = NULL; | |
1394 | return 1; | |
1395 | } | |
1396 | #endif | |
1397 | ||
1398 | static int parse_options(char *options, struct super_block *sb, | |
1399 | unsigned long *journal_devnum, | |
1400 | unsigned int *journal_ioprio, | |
1401 | ext4_fsblk_t *n_blocks_count, int is_remount) | |
1402 | { | |
1403 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
1404 | char *p; | |
1405 | substring_t args[MAX_OPT_ARGS]; | |
1406 | int data_opt = 0; | |
1407 | int option; | |
1408 | #ifdef CONFIG_QUOTA | |
1409 | int qfmt; | |
1410 | #endif | |
1411 | ||
1412 | if (!options) | |
1413 | return 1; | |
1414 | ||
1415 | while ((p = strsep(&options, ",")) != NULL) { | |
1416 | int token; | |
1417 | if (!*p) | |
1418 | continue; | |
1419 | ||
1420 | /* | |
1421 | * Initialize args struct so we know whether arg was | |
1422 | * found; some options take optional arguments. | |
1423 | */ | |
1424 | args[0].to = args[0].from = 0; | |
1425 | token = match_token(p, tokens, args); | |
1426 | switch (token) { | |
1427 | case Opt_bsd_df: | |
1428 | ext4_msg(sb, KERN_WARNING, deprecated_msg, p, "2.6.38"); | |
1429 | clear_opt(sbi->s_mount_opt, MINIX_DF); | |
1430 | break; | |
1431 | case Opt_minix_df: | |
1432 | ext4_msg(sb, KERN_WARNING, deprecated_msg, p, "2.6.38"); | |
1433 | set_opt(sbi->s_mount_opt, MINIX_DF); | |
1434 | ||
1435 | break; | |
1436 | case Opt_grpid: | |
1437 | ext4_msg(sb, KERN_WARNING, deprecated_msg, p, "2.6.38"); | |
1438 | set_opt(sbi->s_mount_opt, GRPID); | |
1439 | ||
1440 | break; | |
1441 | case Opt_nogrpid: | |
1442 | ext4_msg(sb, KERN_WARNING, deprecated_msg, p, "2.6.38"); | |
1443 | clear_opt(sbi->s_mount_opt, GRPID); | |
1444 | ||
1445 | break; | |
1446 | case Opt_resuid: | |
1447 | if (match_int(&args[0], &option)) | |
1448 | return 0; | |
1449 | sbi->s_resuid = option; | |
1450 | break; | |
1451 | case Opt_resgid: | |
1452 | if (match_int(&args[0], &option)) | |
1453 | return 0; | |
1454 | sbi->s_resgid = option; | |
1455 | break; | |
1456 | case Opt_sb: | |
1457 | /* handled by get_sb_block() instead of here */ | |
1458 | /* *sb_block = match_int(&args[0]); */ | |
1459 | break; | |
1460 | case Opt_err_panic: | |
1461 | clear_opt(sbi->s_mount_opt, ERRORS_CONT); | |
1462 | clear_opt(sbi->s_mount_opt, ERRORS_RO); | |
1463 | set_opt(sbi->s_mount_opt, ERRORS_PANIC); | |
1464 | break; | |
1465 | case Opt_err_ro: | |
1466 | clear_opt(sbi->s_mount_opt, ERRORS_CONT); | |
1467 | clear_opt(sbi->s_mount_opt, ERRORS_PANIC); | |
1468 | set_opt(sbi->s_mount_opt, ERRORS_RO); | |
1469 | break; | |
1470 | case Opt_err_cont: | |
1471 | clear_opt(sbi->s_mount_opt, ERRORS_RO); | |
1472 | clear_opt(sbi->s_mount_opt, ERRORS_PANIC); | |
1473 | set_opt(sbi->s_mount_opt, ERRORS_CONT); | |
1474 | break; | |
1475 | case Opt_nouid32: | |
1476 | set_opt(sbi->s_mount_opt, NO_UID32); | |
1477 | break; | |
1478 | case Opt_debug: | |
1479 | set_opt(sbi->s_mount_opt, DEBUG); | |
1480 | break; | |
1481 | case Opt_oldalloc: | |
1482 | set_opt(sbi->s_mount_opt, OLDALLOC); | |
1483 | break; | |
1484 | case Opt_orlov: | |
1485 | clear_opt(sbi->s_mount_opt, OLDALLOC); | |
1486 | break; | |
1487 | #ifdef CONFIG_EXT4_FS_XATTR | |
1488 | case Opt_user_xattr: | |
1489 | set_opt(sbi->s_mount_opt, XATTR_USER); | |
1490 | break; | |
1491 | case Opt_nouser_xattr: | |
1492 | clear_opt(sbi->s_mount_opt, XATTR_USER); | |
1493 | break; | |
1494 | #else | |
1495 | case Opt_user_xattr: | |
1496 | case Opt_nouser_xattr: | |
1497 | ext4_msg(sb, KERN_ERR, "(no)user_xattr options not supported"); | |
1498 | break; | |
1499 | #endif | |
1500 | #ifdef CONFIG_EXT4_FS_POSIX_ACL | |
1501 | case Opt_acl: | |
1502 | set_opt(sbi->s_mount_opt, POSIX_ACL); | |
1503 | break; | |
1504 | case Opt_noacl: | |
1505 | clear_opt(sbi->s_mount_opt, POSIX_ACL); | |
1506 | break; | |
1507 | #else | |
1508 | case Opt_acl: | |
1509 | case Opt_noacl: | |
1510 | ext4_msg(sb, KERN_ERR, "(no)acl options not supported"); | |
1511 | break; | |
1512 | #endif | |
1513 | case Opt_journal_update: | |
1514 | /* @@@ FIXME */ | |
1515 | /* Eventually we will want to be able to create | |
1516 | a journal file here. For now, only allow the | |
1517 | user to specify an existing inode to be the | |
1518 | journal file. */ | |
1519 | if (is_remount) { | |
1520 | ext4_msg(sb, KERN_ERR, | |
1521 | "Cannot specify journal on remount"); | |
1522 | return 0; | |
1523 | } | |
1524 | set_opt(sbi->s_mount_opt, UPDATE_JOURNAL); | |
1525 | break; | |
1526 | case Opt_journal_dev: | |
1527 | if (is_remount) { | |
1528 | ext4_msg(sb, KERN_ERR, | |
1529 | "Cannot specify journal on remount"); | |
1530 | return 0; | |
1531 | } | |
1532 | if (match_int(&args[0], &option)) | |
1533 | return 0; | |
1534 | *journal_devnum = option; | |
1535 | break; | |
1536 | case Opt_journal_checksum: | |
1537 | set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM); | |
1538 | break; | |
1539 | case Opt_journal_async_commit: | |
1540 | set_opt(sbi->s_mount_opt, JOURNAL_ASYNC_COMMIT); | |
1541 | set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM); | |
1542 | break; | |
1543 | case Opt_noload: | |
1544 | set_opt(sbi->s_mount_opt, NOLOAD); | |
1545 | break; | |
1546 | case Opt_commit: | |
1547 | if (match_int(&args[0], &option)) | |
1548 | return 0; | |
1549 | if (option < 0) | |
1550 | return 0; | |
1551 | if (option == 0) | |
1552 | option = JBD2_DEFAULT_MAX_COMMIT_AGE; | |
1553 | sbi->s_commit_interval = HZ * option; | |
1554 | break; | |
1555 | case Opt_max_batch_time: | |
1556 | if (match_int(&args[0], &option)) | |
1557 | return 0; | |
1558 | if (option < 0) | |
1559 | return 0; | |
1560 | if (option == 0) | |
1561 | option = EXT4_DEF_MAX_BATCH_TIME; | |
1562 | sbi->s_max_batch_time = option; | |
1563 | break; | |
1564 | case Opt_min_batch_time: | |
1565 | if (match_int(&args[0], &option)) | |
1566 | return 0; | |
1567 | if (option < 0) | |
1568 | return 0; | |
1569 | sbi->s_min_batch_time = option; | |
1570 | break; | |
1571 | case Opt_data_journal: | |
1572 | data_opt = EXT4_MOUNT_JOURNAL_DATA; | |
1573 | goto datacheck; | |
1574 | case Opt_data_ordered: | |
1575 | data_opt = EXT4_MOUNT_ORDERED_DATA; | |
1576 | goto datacheck; | |
1577 | case Opt_data_writeback: | |
1578 | data_opt = EXT4_MOUNT_WRITEBACK_DATA; | |
1579 | datacheck: | |
1580 | if (is_remount) { | |
1581 | if (test_opt(sb, DATA_FLAGS) != data_opt) { | |
1582 | ext4_msg(sb, KERN_ERR, | |
1583 | "Cannot change data mode on remount"); | |
1584 | return 0; | |
1585 | } | |
1586 | } else { | |
1587 | clear_opt(sbi->s_mount_opt, DATA_FLAGS); | |
1588 | sbi->s_mount_opt |= data_opt; | |
1589 | } | |
1590 | break; | |
1591 | case Opt_data_err_abort: | |
1592 | set_opt(sbi->s_mount_opt, DATA_ERR_ABORT); | |
1593 | break; | |
1594 | case Opt_data_err_ignore: | |
1595 | clear_opt(sbi->s_mount_opt, DATA_ERR_ABORT); | |
1596 | break; | |
1597 | #ifdef CONFIG_QUOTA | |
1598 | case Opt_usrjquota: | |
1599 | if (!set_qf_name(sb, USRQUOTA, &args[0])) | |
1600 | return 0; | |
1601 | break; | |
1602 | case Opt_grpjquota: | |
1603 | if (!set_qf_name(sb, GRPQUOTA, &args[0])) | |
1604 | return 0; | |
1605 | break; | |
1606 | case Opt_offusrjquota: | |
1607 | if (!clear_qf_name(sb, USRQUOTA)) | |
1608 | return 0; | |
1609 | break; | |
1610 | case Opt_offgrpjquota: | |
1611 | if (!clear_qf_name(sb, GRPQUOTA)) | |
1612 | return 0; | |
1613 | break; | |
1614 | ||
1615 | case Opt_jqfmt_vfsold: | |
1616 | qfmt = QFMT_VFS_OLD; | |
1617 | goto set_qf_format; | |
1618 | case Opt_jqfmt_vfsv0: | |
1619 | qfmt = QFMT_VFS_V0; | |
1620 | goto set_qf_format; | |
1621 | case Opt_jqfmt_vfsv1: | |
1622 | qfmt = QFMT_VFS_V1; | |
1623 | set_qf_format: | |
1624 | if (sb_any_quota_loaded(sb) && | |
1625 | sbi->s_jquota_fmt != qfmt) { | |
1626 | ext4_msg(sb, KERN_ERR, "Cannot change " | |
1627 | "journaled quota options when " | |
1628 | "quota turned on"); | |
1629 | return 0; | |
1630 | } | |
1631 | sbi->s_jquota_fmt = qfmt; | |
1632 | break; | |
1633 | case Opt_quota: | |
1634 | case Opt_usrquota: | |
1635 | set_opt(sbi->s_mount_opt, QUOTA); | |
1636 | set_opt(sbi->s_mount_opt, USRQUOTA); | |
1637 | break; | |
1638 | case Opt_grpquota: | |
1639 | set_opt(sbi->s_mount_opt, QUOTA); | |
1640 | set_opt(sbi->s_mount_opt, GRPQUOTA); | |
1641 | break; | |
1642 | case Opt_noquota: | |
1643 | if (sb_any_quota_loaded(sb)) { | |
1644 | ext4_msg(sb, KERN_ERR, "Cannot change quota " | |
1645 | "options when quota turned on"); | |
1646 | return 0; | |
1647 | } | |
1648 | clear_opt(sbi->s_mount_opt, QUOTA); | |
1649 | clear_opt(sbi->s_mount_opt, USRQUOTA); | |
1650 | clear_opt(sbi->s_mount_opt, GRPQUOTA); | |
1651 | break; | |
1652 | #else | |
1653 | case Opt_quota: | |
1654 | case Opt_usrquota: | |
1655 | case Opt_grpquota: | |
1656 | ext4_msg(sb, KERN_ERR, | |
1657 | "quota options not supported"); | |
1658 | break; | |
1659 | case Opt_usrjquota: | |
1660 | case Opt_grpjquota: | |
1661 | case Opt_offusrjquota: | |
1662 | case Opt_offgrpjquota: | |
1663 | case Opt_jqfmt_vfsold: | |
1664 | case Opt_jqfmt_vfsv0: | |
1665 | case Opt_jqfmt_vfsv1: | |
1666 | ext4_msg(sb, KERN_ERR, | |
1667 | "journaled quota options not supported"); | |
1668 | break; | |
1669 | case Opt_noquota: | |
1670 | break; | |
1671 | #endif | |
1672 | case Opt_abort: | |
1673 | sbi->s_mount_flags |= EXT4_MF_FS_ABORTED; | |
1674 | break; | |
1675 | case Opt_nobarrier: | |
1676 | clear_opt(sbi->s_mount_opt, BARRIER); | |
1677 | break; | |
1678 | case Opt_barrier: | |
1679 | if (args[0].from) { | |
1680 | if (match_int(&args[0], &option)) | |
1681 | return 0; | |
1682 | } else | |
1683 | option = 1; /* No argument, default to 1 */ | |
1684 | if (option) | |
1685 | set_opt(sbi->s_mount_opt, BARRIER); | |
1686 | else | |
1687 | clear_opt(sbi->s_mount_opt, BARRIER); | |
1688 | break; | |
1689 | case Opt_ignore: | |
1690 | break; | |
1691 | case Opt_resize: | |
1692 | if (!is_remount) { | |
1693 | ext4_msg(sb, KERN_ERR, | |
1694 | "resize option only available " | |
1695 | "for remount"); | |
1696 | return 0; | |
1697 | } | |
1698 | if (match_int(&args[0], &option) != 0) | |
1699 | return 0; | |
1700 | *n_blocks_count = option; | |
1701 | break; | |
1702 | case Opt_nobh: | |
1703 | ext4_msg(sb, KERN_WARNING, | |
1704 | "Ignoring deprecated nobh option"); | |
1705 | break; | |
1706 | case Opt_bh: | |
1707 | ext4_msg(sb, KERN_WARNING, | |
1708 | "Ignoring deprecated bh option"); | |
1709 | break; | |
1710 | case Opt_i_version: | |
1711 | set_opt(sbi->s_mount_opt, I_VERSION); | |
1712 | sb->s_flags |= MS_I_VERSION; | |
1713 | break; | |
1714 | case Opt_nodelalloc: | |
1715 | clear_opt(sbi->s_mount_opt, DELALLOC); | |
1716 | break; | |
1717 | case Opt_stripe: | |
1718 | if (match_int(&args[0], &option)) | |
1719 | return 0; | |
1720 | if (option < 0) | |
1721 | return 0; | |
1722 | sbi->s_stripe = option; | |
1723 | break; | |
1724 | case Opt_delalloc: | |
1725 | set_opt(sbi->s_mount_opt, DELALLOC); | |
1726 | break; | |
1727 | case Opt_block_validity: | |
1728 | set_opt(sbi->s_mount_opt, BLOCK_VALIDITY); | |
1729 | break; | |
1730 | case Opt_noblock_validity: | |
1731 | clear_opt(sbi->s_mount_opt, BLOCK_VALIDITY); | |
1732 | break; | |
1733 | case Opt_inode_readahead_blks: | |
1734 | if (match_int(&args[0], &option)) | |
1735 | return 0; | |
1736 | if (option < 0 || option > (1 << 30)) | |
1737 | return 0; | |
1738 | if (!is_power_of_2(option)) { | |
1739 | ext4_msg(sb, KERN_ERR, | |
1740 | "EXT4-fs: inode_readahead_blks" | |
1741 | " must be a power of 2"); | |
1742 | return 0; | |
1743 | } | |
1744 | sbi->s_inode_readahead_blks = option; | |
1745 | break; | |
1746 | case Opt_journal_ioprio: | |
1747 | if (match_int(&args[0], &option)) | |
1748 | return 0; | |
1749 | if (option < 0 || option > 7) | |
1750 | break; | |
1751 | *journal_ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, | |
1752 | option); | |
1753 | break; | |
1754 | case Opt_noauto_da_alloc: | |
1755 | set_opt(sbi->s_mount_opt,NO_AUTO_DA_ALLOC); | |
1756 | break; | |
1757 | case Opt_auto_da_alloc: | |
1758 | if (args[0].from) { | |
1759 | if (match_int(&args[0], &option)) | |
1760 | return 0; | |
1761 | } else | |
1762 | option = 1; /* No argument, default to 1 */ | |
1763 | if (option) | |
1764 | clear_opt(sbi->s_mount_opt, NO_AUTO_DA_ALLOC); | |
1765 | else | |
1766 | set_opt(sbi->s_mount_opt,NO_AUTO_DA_ALLOC); | |
1767 | break; | |
1768 | case Opt_discard: | |
1769 | set_opt(sbi->s_mount_opt, DISCARD); | |
1770 | break; | |
1771 | case Opt_nodiscard: | |
1772 | clear_opt(sbi->s_mount_opt, DISCARD); | |
1773 | break; | |
1774 | case Opt_dioread_nolock: | |
1775 | set_opt(sbi->s_mount_opt, DIOREAD_NOLOCK); | |
1776 | break; | |
1777 | case Opt_dioread_lock: | |
1778 | clear_opt(sbi->s_mount_opt, DIOREAD_NOLOCK); | |
1779 | break; | |
1780 | case Opt_init_inode_table: | |
1781 | set_opt(sbi->s_mount_opt, INIT_INODE_TABLE); | |
1782 | if (args[0].from) { | |
1783 | if (match_int(&args[0], &option)) | |
1784 | return 0; | |
1785 | } else | |
1786 | option = EXT4_DEF_LI_WAIT_MULT; | |
1787 | if (option < 0) | |
1788 | return 0; | |
1789 | sbi->s_li_wait_mult = option; | |
1790 | break; | |
1791 | case Opt_noinit_inode_table: | |
1792 | clear_opt(sbi->s_mount_opt, INIT_INODE_TABLE); | |
1793 | break; | |
1794 | default: | |
1795 | ext4_msg(sb, KERN_ERR, | |
1796 | "Unrecognized mount option \"%s\" " | |
1797 | "or missing value", p); | |
1798 | return 0; | |
1799 | } | |
1800 | } | |
1801 | #ifdef CONFIG_QUOTA | |
1802 | if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) { | |
1803 | if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA]) | |
1804 | clear_opt(sbi->s_mount_opt, USRQUOTA); | |
1805 | ||
1806 | if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA]) | |
1807 | clear_opt(sbi->s_mount_opt, GRPQUOTA); | |
1808 | ||
1809 | if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) { | |
1810 | ext4_msg(sb, KERN_ERR, "old and new quota " | |
1811 | "format mixing"); | |
1812 | return 0; | |
1813 | } | |
1814 | ||
1815 | if (!sbi->s_jquota_fmt) { | |
1816 | ext4_msg(sb, KERN_ERR, "journaled quota format " | |
1817 | "not specified"); | |
1818 | return 0; | |
1819 | } | |
1820 | } else { | |
1821 | if (sbi->s_jquota_fmt) { | |
1822 | ext4_msg(sb, KERN_ERR, "journaled quota format " | |
1823 | "specified with no journaling " | |
1824 | "enabled"); | |
1825 | return 0; | |
1826 | } | |
1827 | } | |
1828 | #endif | |
1829 | return 1; | |
1830 | } | |
1831 | ||
1832 | static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es, | |
1833 | int read_only) | |
1834 | { | |
1835 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
1836 | int res = 0; | |
1837 | ||
1838 | if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) { | |
1839 | ext4_msg(sb, KERN_ERR, "revision level too high, " | |
1840 | "forcing read-only mode"); | |
1841 | res = MS_RDONLY; | |
1842 | } | |
1843 | if (read_only) | |
1844 | return res; | |
1845 | if (!(sbi->s_mount_state & EXT4_VALID_FS)) | |
1846 | ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, " | |
1847 | "running e2fsck is recommended"); | |
1848 | else if ((sbi->s_mount_state & EXT4_ERROR_FS)) | |
1849 | ext4_msg(sb, KERN_WARNING, | |
1850 | "warning: mounting fs with errors, " | |
1851 | "running e2fsck is recommended"); | |
1852 | else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 && | |
1853 | le16_to_cpu(es->s_mnt_count) >= | |
1854 | (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count)) | |
1855 | ext4_msg(sb, KERN_WARNING, | |
1856 | "warning: maximal mount count reached, " | |
1857 | "running e2fsck is recommended"); | |
1858 | else if (le32_to_cpu(es->s_checkinterval) && | |
1859 | (le32_to_cpu(es->s_lastcheck) + | |
1860 | le32_to_cpu(es->s_checkinterval) <= get_seconds())) | |
1861 | ext4_msg(sb, KERN_WARNING, | |
1862 | "warning: checktime reached, " | |
1863 | "running e2fsck is recommended"); | |
1864 | if (!sbi->s_journal) | |
1865 | es->s_state &= cpu_to_le16(~EXT4_VALID_FS); | |
1866 | if (!(__s16) le16_to_cpu(es->s_max_mnt_count)) | |
1867 | es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT); | |
1868 | le16_add_cpu(&es->s_mnt_count, 1); | |
1869 | es->s_mtime = cpu_to_le32(get_seconds()); | |
1870 | ext4_update_dynamic_rev(sb); | |
1871 | if (sbi->s_journal) | |
1872 | EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); | |
1873 | ||
1874 | ext4_commit_super(sb, 1); | |
1875 | if (test_opt(sb, DEBUG)) | |
1876 | printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, " | |
1877 | "bpg=%lu, ipg=%lu, mo=%04x]\n", | |
1878 | sb->s_blocksize, | |
1879 | sbi->s_groups_count, | |
1880 | EXT4_BLOCKS_PER_GROUP(sb), | |
1881 | EXT4_INODES_PER_GROUP(sb), | |
1882 | sbi->s_mount_opt); | |
1883 | ||
1884 | return res; | |
1885 | } | |
1886 | ||
1887 | static int ext4_fill_flex_info(struct super_block *sb) | |
1888 | { | |
1889 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
1890 | struct ext4_group_desc *gdp = NULL; | |
1891 | ext4_group_t flex_group_count; | |
1892 | ext4_group_t flex_group; | |
1893 | int groups_per_flex = 0; | |
1894 | size_t size; | |
1895 | int i; | |
1896 | ||
1897 | sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex; | |
1898 | groups_per_flex = 1 << sbi->s_log_groups_per_flex; | |
1899 | ||
1900 | if (groups_per_flex < 2) { | |
1901 | sbi->s_log_groups_per_flex = 0; | |
1902 | return 1; | |
1903 | } | |
1904 | ||
1905 | /* We allocate both existing and potentially added groups */ | |
1906 | flex_group_count = ((sbi->s_groups_count + groups_per_flex - 1) + | |
1907 | ((le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) + 1) << | |
1908 | EXT4_DESC_PER_BLOCK_BITS(sb))) / groups_per_flex; | |
1909 | size = flex_group_count * sizeof(struct flex_groups); | |
1910 | sbi->s_flex_groups = kzalloc(size, GFP_KERNEL); | |
1911 | if (sbi->s_flex_groups == NULL) { | |
1912 | sbi->s_flex_groups = vmalloc(size); | |
1913 | if (sbi->s_flex_groups) | |
1914 | memset(sbi->s_flex_groups, 0, size); | |
1915 | } | |
1916 | if (sbi->s_flex_groups == NULL) { | |
1917 | ext4_msg(sb, KERN_ERR, "not enough memory for " | |
1918 | "%u flex groups", flex_group_count); | |
1919 | goto failed; | |
1920 | } | |
1921 | ||
1922 | for (i = 0; i < sbi->s_groups_count; i++) { | |
1923 | gdp = ext4_get_group_desc(sb, i, NULL); | |
1924 | ||
1925 | flex_group = ext4_flex_group(sbi, i); | |
1926 | atomic_add(ext4_free_inodes_count(sb, gdp), | |
1927 | &sbi->s_flex_groups[flex_group].free_inodes); | |
1928 | atomic_add(ext4_free_blks_count(sb, gdp), | |
1929 | &sbi->s_flex_groups[flex_group].free_blocks); | |
1930 | atomic_add(ext4_used_dirs_count(sb, gdp), | |
1931 | &sbi->s_flex_groups[flex_group].used_dirs); | |
1932 | } | |
1933 | ||
1934 | return 1; | |
1935 | failed: | |
1936 | return 0; | |
1937 | } | |
1938 | ||
1939 | __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group, | |
1940 | struct ext4_group_desc *gdp) | |
1941 | { | |
1942 | __u16 crc = 0; | |
1943 | ||
1944 | if (sbi->s_es->s_feature_ro_compat & | |
1945 | cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) { | |
1946 | int offset = offsetof(struct ext4_group_desc, bg_checksum); | |
1947 | __le32 le_group = cpu_to_le32(block_group); | |
1948 | ||
1949 | crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid)); | |
1950 | crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group)); | |
1951 | crc = crc16(crc, (__u8 *)gdp, offset); | |
1952 | offset += sizeof(gdp->bg_checksum); /* skip checksum */ | |
1953 | /* for checksum of struct ext4_group_desc do the rest...*/ | |
1954 | if ((sbi->s_es->s_feature_incompat & | |
1955 | cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) && | |
1956 | offset < le16_to_cpu(sbi->s_es->s_desc_size)) | |
1957 | crc = crc16(crc, (__u8 *)gdp + offset, | |
1958 | le16_to_cpu(sbi->s_es->s_desc_size) - | |
1959 | offset); | |
1960 | } | |
1961 | ||
1962 | return cpu_to_le16(crc); | |
1963 | } | |
1964 | ||
1965 | int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 block_group, | |
1966 | struct ext4_group_desc *gdp) | |
1967 | { | |
1968 | if ((sbi->s_es->s_feature_ro_compat & | |
1969 | cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) && | |
1970 | (gdp->bg_checksum != ext4_group_desc_csum(sbi, block_group, gdp))) | |
1971 | return 0; | |
1972 | ||
1973 | return 1; | |
1974 | } | |
1975 | ||
1976 | /* Called at mount-time, super-block is locked */ | |
1977 | static int ext4_check_descriptors(struct super_block *sb, | |
1978 | ext4_group_t *first_not_zeroed) | |
1979 | { | |
1980 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
1981 | ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block); | |
1982 | ext4_fsblk_t last_block; | |
1983 | ext4_fsblk_t block_bitmap; | |
1984 | ext4_fsblk_t inode_bitmap; | |
1985 | ext4_fsblk_t inode_table; | |
1986 | int flexbg_flag = 0; | |
1987 | ext4_group_t i, grp = sbi->s_groups_count; | |
1988 | ||
1989 | if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG)) | |
1990 | flexbg_flag = 1; | |
1991 | ||
1992 | ext4_debug("Checking group descriptors"); | |
1993 | ||
1994 | for (i = 0; i < sbi->s_groups_count; i++) { | |
1995 | struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL); | |
1996 | ||
1997 | if (i == sbi->s_groups_count - 1 || flexbg_flag) | |
1998 | last_block = ext4_blocks_count(sbi->s_es) - 1; | |
1999 | else | |
2000 | last_block = first_block + | |
2001 | (EXT4_BLOCKS_PER_GROUP(sb) - 1); | |
2002 | ||
2003 | if ((grp == sbi->s_groups_count) && | |
2004 | !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED))) | |
2005 | grp = i; | |
2006 | ||
2007 | block_bitmap = ext4_block_bitmap(sb, gdp); | |
2008 | if (block_bitmap < first_block || block_bitmap > last_block) { | |
2009 | ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: " | |
2010 | "Block bitmap for group %u not in group " | |
2011 | "(block %llu)!", i, block_bitmap); | |
2012 | return 0; | |
2013 | } | |
2014 | inode_bitmap = ext4_inode_bitmap(sb, gdp); | |
2015 | if (inode_bitmap < first_block || inode_bitmap > last_block) { | |
2016 | ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: " | |
2017 | "Inode bitmap for group %u not in group " | |
2018 | "(block %llu)!", i, inode_bitmap); | |
2019 | return 0; | |
2020 | } | |
2021 | inode_table = ext4_inode_table(sb, gdp); | |
2022 | if (inode_table < first_block || | |
2023 | inode_table + sbi->s_itb_per_group - 1 > last_block) { | |
2024 | ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: " | |
2025 | "Inode table for group %u not in group " | |
2026 | "(block %llu)!", i, inode_table); | |
2027 | return 0; | |
2028 | } | |
2029 | ext4_lock_group(sb, i); | |
2030 | if (!ext4_group_desc_csum_verify(sbi, i, gdp)) { | |
2031 | ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: " | |
2032 | "Checksum for group %u failed (%u!=%u)", | |
2033 | i, le16_to_cpu(ext4_group_desc_csum(sbi, i, | |
2034 | gdp)), le16_to_cpu(gdp->bg_checksum)); | |
2035 | if (!(sb->s_flags & MS_RDONLY)) { | |
2036 | ext4_unlock_group(sb, i); | |
2037 | return 0; | |
2038 | } | |
2039 | } | |
2040 | ext4_unlock_group(sb, i); | |
2041 | if (!flexbg_flag) | |
2042 | first_block += EXT4_BLOCKS_PER_GROUP(sb); | |
2043 | } | |
2044 | if (NULL != first_not_zeroed) | |
2045 | *first_not_zeroed = grp; | |
2046 | ||
2047 | ext4_free_blocks_count_set(sbi->s_es, ext4_count_free_blocks(sb)); | |
2048 | sbi->s_es->s_free_inodes_count =cpu_to_le32(ext4_count_free_inodes(sb)); | |
2049 | return 1; | |
2050 | } | |
2051 | ||
2052 | /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at | |
2053 | * the superblock) which were deleted from all directories, but held open by | |
2054 | * a process at the time of a crash. We walk the list and try to delete these | |
2055 | * inodes at recovery time (only with a read-write filesystem). | |
2056 | * | |
2057 | * In order to keep the orphan inode chain consistent during traversal (in | |
2058 | * case of crash during recovery), we link each inode into the superblock | |
2059 | * orphan list_head and handle it the same way as an inode deletion during | |
2060 | * normal operation (which journals the operations for us). | |
2061 | * | |
2062 | * We only do an iget() and an iput() on each inode, which is very safe if we | |
2063 | * accidentally point at an in-use or already deleted inode. The worst that | |
2064 | * can happen in this case is that we get a "bit already cleared" message from | |
2065 | * ext4_free_inode(). The only reason we would point at a wrong inode is if | |
2066 | * e2fsck was run on this filesystem, and it must have already done the orphan | |
2067 | * inode cleanup for us, so we can safely abort without any further action. | |
2068 | */ | |
2069 | static void ext4_orphan_cleanup(struct super_block *sb, | |
2070 | struct ext4_super_block *es) | |
2071 | { | |
2072 | unsigned int s_flags = sb->s_flags; | |
2073 | int nr_orphans = 0, nr_truncates = 0; | |
2074 | #ifdef CONFIG_QUOTA | |
2075 | int i; | |
2076 | #endif | |
2077 | if (!es->s_last_orphan) { | |
2078 | jbd_debug(4, "no orphan inodes to clean up\n"); | |
2079 | return; | |
2080 | } | |
2081 | ||
2082 | if (bdev_read_only(sb->s_bdev)) { | |
2083 | ext4_msg(sb, KERN_ERR, "write access " | |
2084 | "unavailable, skipping orphan cleanup"); | |
2085 | return; | |
2086 | } | |
2087 | ||
2088 | if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) { | |
2089 | if (es->s_last_orphan) | |
2090 | jbd_debug(1, "Errors on filesystem, " | |
2091 | "clearing orphan list.\n"); | |
2092 | es->s_last_orphan = 0; | |
2093 | jbd_debug(1, "Skipping orphan recovery on fs with errors.\n"); | |
2094 | return; | |
2095 | } | |
2096 | ||
2097 | if (s_flags & MS_RDONLY) { | |
2098 | ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs"); | |
2099 | sb->s_flags &= ~MS_RDONLY; | |
2100 | } | |
2101 | #ifdef CONFIG_QUOTA | |
2102 | /* Needed for iput() to work correctly and not trash data */ | |
2103 | sb->s_flags |= MS_ACTIVE; | |
2104 | /* Turn on quotas so that they are updated correctly */ | |
2105 | for (i = 0; i < MAXQUOTAS; i++) { | |
2106 | if (EXT4_SB(sb)->s_qf_names[i]) { | |
2107 | int ret = ext4_quota_on_mount(sb, i); | |
2108 | if (ret < 0) | |
2109 | ext4_msg(sb, KERN_ERR, | |
2110 | "Cannot turn on journaled " | |
2111 | "quota: error %d", ret); | |
2112 | } | |
2113 | } | |
2114 | #endif | |
2115 | ||
2116 | while (es->s_last_orphan) { | |
2117 | struct inode *inode; | |
2118 | ||
2119 | inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan)); | |
2120 | if (IS_ERR(inode)) { | |
2121 | es->s_last_orphan = 0; | |
2122 | break; | |
2123 | } | |
2124 | ||
2125 | list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan); | |
2126 | dquot_initialize(inode); | |
2127 | if (inode->i_nlink) { | |
2128 | ext4_msg(sb, KERN_DEBUG, | |
2129 | "%s: truncating inode %lu to %lld bytes", | |
2130 | __func__, inode->i_ino, inode->i_size); | |
2131 | jbd_debug(2, "truncating inode %lu to %lld bytes\n", | |
2132 | inode->i_ino, inode->i_size); | |
2133 | ext4_truncate(inode); | |
2134 | nr_truncates++; | |
2135 | } else { | |
2136 | ext4_msg(sb, KERN_DEBUG, | |
2137 | "%s: deleting unreferenced inode %lu", | |
2138 | __func__, inode->i_ino); | |
2139 | jbd_debug(2, "deleting unreferenced inode %lu\n", | |
2140 | inode->i_ino); | |
2141 | nr_orphans++; | |
2142 | } | |
2143 | iput(inode); /* The delete magic happens here! */ | |
2144 | } | |
2145 | ||
2146 | #define PLURAL(x) (x), ((x) == 1) ? "" : "s" | |
2147 | ||
2148 | if (nr_orphans) | |
2149 | ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted", | |
2150 | PLURAL(nr_orphans)); | |
2151 | if (nr_truncates) | |
2152 | ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up", | |
2153 | PLURAL(nr_truncates)); | |
2154 | #ifdef CONFIG_QUOTA | |
2155 | /* Turn quotas off */ | |
2156 | for (i = 0; i < MAXQUOTAS; i++) { | |
2157 | if (sb_dqopt(sb)->files[i]) | |
2158 | dquot_quota_off(sb, i); | |
2159 | } | |
2160 | #endif | |
2161 | sb->s_flags = s_flags; /* Restore MS_RDONLY status */ | |
2162 | } | |
2163 | ||
2164 | /* | |
2165 | * Maximal extent format file size. | |
2166 | * Resulting logical blkno at s_maxbytes must fit in our on-disk | |
2167 | * extent format containers, within a sector_t, and within i_blocks | |
2168 | * in the vfs. ext4 inode has 48 bits of i_block in fsblock units, | |
2169 | * so that won't be a limiting factor. | |
2170 | * | |
2171 | * Note, this does *not* consider any metadata overhead for vfs i_blocks. | |
2172 | */ | |
2173 | static loff_t ext4_max_size(int blkbits, int has_huge_files) | |
2174 | { | |
2175 | loff_t res; | |
2176 | loff_t upper_limit = MAX_LFS_FILESIZE; | |
2177 | ||
2178 | /* small i_blocks in vfs inode? */ | |
2179 | if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) { | |
2180 | /* | |
2181 | * CONFIG_LBDAF is not enabled implies the inode | |
2182 | * i_block represent total blocks in 512 bytes | |
2183 | * 32 == size of vfs inode i_blocks * 8 | |
2184 | */ | |
2185 | upper_limit = (1LL << 32) - 1; | |
2186 | ||
2187 | /* total blocks in file system block size */ | |
2188 | upper_limit >>= (blkbits - 9); | |
2189 | upper_limit <<= blkbits; | |
2190 | } | |
2191 | ||
2192 | /* 32-bit extent-start container, ee_block */ | |
2193 | res = 1LL << 32; | |
2194 | res <<= blkbits; | |
2195 | res -= 1; | |
2196 | ||
2197 | /* Sanity check against vm- & vfs- imposed limits */ | |
2198 | if (res > upper_limit) | |
2199 | res = upper_limit; | |
2200 | ||
2201 | return res; | |
2202 | } | |
2203 | ||
2204 | /* | |
2205 | * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect | |
2206 | * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks. | |
2207 | * We need to be 1 filesystem block less than the 2^48 sector limit. | |
2208 | */ | |
2209 | static loff_t ext4_max_bitmap_size(int bits, int has_huge_files) | |
2210 | { | |
2211 | loff_t res = EXT4_NDIR_BLOCKS; | |
2212 | int meta_blocks; | |
2213 | loff_t upper_limit; | |
2214 | /* This is calculated to be the largest file size for a dense, block | |
2215 | * mapped file such that the file's total number of 512-byte sectors, | |
2216 | * including data and all indirect blocks, does not exceed (2^48 - 1). | |
2217 | * | |
2218 | * __u32 i_blocks_lo and _u16 i_blocks_high represent the total | |
2219 | * number of 512-byte sectors of the file. | |
2220 | */ | |
2221 | ||
2222 | if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) { | |
2223 | /* | |
2224 | * !has_huge_files or CONFIG_LBDAF not enabled implies that | |
2225 | * the inode i_block field represents total file blocks in | |
2226 | * 2^32 512-byte sectors == size of vfs inode i_blocks * 8 | |
2227 | */ | |
2228 | upper_limit = (1LL << 32) - 1; | |
2229 | ||
2230 | /* total blocks in file system block size */ | |
2231 | upper_limit >>= (bits - 9); | |
2232 | ||
2233 | } else { | |
2234 | /* | |
2235 | * We use 48 bit ext4_inode i_blocks | |
2236 | * With EXT4_HUGE_FILE_FL set the i_blocks | |
2237 | * represent total number of blocks in | |
2238 | * file system block size | |
2239 | */ | |
2240 | upper_limit = (1LL << 48) - 1; | |
2241 | ||
2242 | } | |
2243 | ||
2244 | /* indirect blocks */ | |
2245 | meta_blocks = 1; | |
2246 | /* double indirect blocks */ | |
2247 | meta_blocks += 1 + (1LL << (bits-2)); | |
2248 | /* tripple indirect blocks */ | |
2249 | meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2))); | |
2250 | ||
2251 | upper_limit -= meta_blocks; | |
2252 | upper_limit <<= bits; | |
2253 | ||
2254 | res += 1LL << (bits-2); | |
2255 | res += 1LL << (2*(bits-2)); | |
2256 | res += 1LL << (3*(bits-2)); | |
2257 | res <<= bits; | |
2258 | if (res > upper_limit) | |
2259 | res = upper_limit; | |
2260 | ||
2261 | if (res > MAX_LFS_FILESIZE) | |
2262 | res = MAX_LFS_FILESIZE; | |
2263 | ||
2264 | return res; | |
2265 | } | |
2266 | ||
2267 | static ext4_fsblk_t descriptor_loc(struct super_block *sb, | |
2268 | ext4_fsblk_t logical_sb_block, int nr) | |
2269 | { | |
2270 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
2271 | ext4_group_t bg, first_meta_bg; | |
2272 | int has_super = 0; | |
2273 | ||
2274 | first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg); | |
2275 | ||
2276 | if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) || | |
2277 | nr < first_meta_bg) | |
2278 | return logical_sb_block + nr + 1; | |
2279 | bg = sbi->s_desc_per_block * nr; | |
2280 | if (ext4_bg_has_super(sb, bg)) | |
2281 | has_super = 1; | |
2282 | ||
2283 | return (has_super + ext4_group_first_block_no(sb, bg)); | |
2284 | } | |
2285 | ||
2286 | /** | |
2287 | * ext4_get_stripe_size: Get the stripe size. | |
2288 | * @sbi: In memory super block info | |
2289 | * | |
2290 | * If we have specified it via mount option, then | |
2291 | * use the mount option value. If the value specified at mount time is | |
2292 | * greater than the blocks per group use the super block value. | |
2293 | * If the super block value is greater than blocks per group return 0. | |
2294 | * Allocator needs it be less than blocks per group. | |
2295 | * | |
2296 | */ | |
2297 | static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi) | |
2298 | { | |
2299 | unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride); | |
2300 | unsigned long stripe_width = | |
2301 | le32_to_cpu(sbi->s_es->s_raid_stripe_width); | |
2302 | ||
2303 | if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group) | |
2304 | return sbi->s_stripe; | |
2305 | ||
2306 | if (stripe_width <= sbi->s_blocks_per_group) | |
2307 | return stripe_width; | |
2308 | ||
2309 | if (stride <= sbi->s_blocks_per_group) | |
2310 | return stride; | |
2311 | ||
2312 | return 0; | |
2313 | } | |
2314 | ||
2315 | /* sysfs supprt */ | |
2316 | ||
2317 | struct ext4_attr { | |
2318 | struct attribute attr; | |
2319 | ssize_t (*show)(struct ext4_attr *, struct ext4_sb_info *, char *); | |
2320 | ssize_t (*store)(struct ext4_attr *, struct ext4_sb_info *, | |
2321 | const char *, size_t); | |
2322 | int offset; | |
2323 | }; | |
2324 | ||
2325 | static int parse_strtoul(const char *buf, | |
2326 | unsigned long max, unsigned long *value) | |
2327 | { | |
2328 | char *endp; | |
2329 | ||
2330 | *value = simple_strtoul(skip_spaces(buf), &endp, 0); | |
2331 | endp = skip_spaces(endp); | |
2332 | if (*endp || *value > max) | |
2333 | return -EINVAL; | |
2334 | ||
2335 | return 0; | |
2336 | } | |
2337 | ||
2338 | static ssize_t delayed_allocation_blocks_show(struct ext4_attr *a, | |
2339 | struct ext4_sb_info *sbi, | |
2340 | char *buf) | |
2341 | { | |
2342 | return snprintf(buf, PAGE_SIZE, "%llu\n", | |
2343 | (s64) percpu_counter_sum(&sbi->s_dirtyblocks_counter)); | |
2344 | } | |
2345 | ||
2346 | static ssize_t session_write_kbytes_show(struct ext4_attr *a, | |
2347 | struct ext4_sb_info *sbi, char *buf) | |
2348 | { | |
2349 | struct super_block *sb = sbi->s_buddy_cache->i_sb; | |
2350 | ||
2351 | if (!sb->s_bdev->bd_part) | |
2352 | return snprintf(buf, PAGE_SIZE, "0\n"); | |
2353 | return snprintf(buf, PAGE_SIZE, "%lu\n", | |
2354 | (part_stat_read(sb->s_bdev->bd_part, sectors[1]) - | |
2355 | sbi->s_sectors_written_start) >> 1); | |
2356 | } | |
2357 | ||
2358 | static ssize_t lifetime_write_kbytes_show(struct ext4_attr *a, | |
2359 | struct ext4_sb_info *sbi, char *buf) | |
2360 | { | |
2361 | struct super_block *sb = sbi->s_buddy_cache->i_sb; | |
2362 | ||
2363 | if (!sb->s_bdev->bd_part) | |
2364 | return snprintf(buf, PAGE_SIZE, "0\n"); | |
2365 | return snprintf(buf, PAGE_SIZE, "%llu\n", | |
2366 | (unsigned long long)(sbi->s_kbytes_written + | |
2367 | ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) - | |
2368 | EXT4_SB(sb)->s_sectors_written_start) >> 1))); | |
2369 | } | |
2370 | ||
2371 | static ssize_t inode_readahead_blks_store(struct ext4_attr *a, | |
2372 | struct ext4_sb_info *sbi, | |
2373 | const char *buf, size_t count) | |
2374 | { | |
2375 | unsigned long t; | |
2376 | ||
2377 | if (parse_strtoul(buf, 0x40000000, &t)) | |
2378 | return -EINVAL; | |
2379 | ||
2380 | if (!is_power_of_2(t)) | |
2381 | return -EINVAL; | |
2382 | ||
2383 | sbi->s_inode_readahead_blks = t; | |
2384 | return count; | |
2385 | } | |
2386 | ||
2387 | static ssize_t sbi_ui_show(struct ext4_attr *a, | |
2388 | struct ext4_sb_info *sbi, char *buf) | |
2389 | { | |
2390 | unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset); | |
2391 | ||
2392 | return snprintf(buf, PAGE_SIZE, "%u\n", *ui); | |
2393 | } | |
2394 | ||
2395 | static ssize_t sbi_ui_store(struct ext4_attr *a, | |
2396 | struct ext4_sb_info *sbi, | |
2397 | const char *buf, size_t count) | |
2398 | { | |
2399 | unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset); | |
2400 | unsigned long t; | |
2401 | ||
2402 | if (parse_strtoul(buf, 0xffffffff, &t)) | |
2403 | return -EINVAL; | |
2404 | *ui = t; | |
2405 | return count; | |
2406 | } | |
2407 | ||
2408 | #define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \ | |
2409 | static struct ext4_attr ext4_attr_##_name = { \ | |
2410 | .attr = {.name = __stringify(_name), .mode = _mode }, \ | |
2411 | .show = _show, \ | |
2412 | .store = _store, \ | |
2413 | .offset = offsetof(struct ext4_sb_info, _elname), \ | |
2414 | } | |
2415 | #define EXT4_ATTR(name, mode, show, store) \ | |
2416 | static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store) | |
2417 | ||
2418 | #define EXT4_INFO_ATTR(name) EXT4_ATTR(name, 0444, NULL, NULL) | |
2419 | #define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL) | |
2420 | #define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store) | |
2421 | #define EXT4_RW_ATTR_SBI_UI(name, elname) \ | |
2422 | EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname) | |
2423 | #define ATTR_LIST(name) &ext4_attr_##name.attr | |
2424 | ||
2425 | EXT4_RO_ATTR(delayed_allocation_blocks); | |
2426 | EXT4_RO_ATTR(session_write_kbytes); | |
2427 | EXT4_RO_ATTR(lifetime_write_kbytes); | |
2428 | EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, sbi_ui_show, | |
2429 | inode_readahead_blks_store, s_inode_readahead_blks); | |
2430 | EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal); | |
2431 | EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats); | |
2432 | EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan); | |
2433 | EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan); | |
2434 | EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs); | |
2435 | EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request); | |
2436 | EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc); | |
2437 | EXT4_RW_ATTR_SBI_UI(max_writeback_mb_bump, s_max_writeback_mb_bump); | |
2438 | ||
2439 | static struct attribute *ext4_attrs[] = { | |
2440 | ATTR_LIST(delayed_allocation_blocks), | |
2441 | ATTR_LIST(session_write_kbytes), | |
2442 | ATTR_LIST(lifetime_write_kbytes), | |
2443 | ATTR_LIST(inode_readahead_blks), | |
2444 | ATTR_LIST(inode_goal), | |
2445 | ATTR_LIST(mb_stats), | |
2446 | ATTR_LIST(mb_max_to_scan), | |
2447 | ATTR_LIST(mb_min_to_scan), | |
2448 | ATTR_LIST(mb_order2_req), | |
2449 | ATTR_LIST(mb_stream_req), | |
2450 | ATTR_LIST(mb_group_prealloc), | |
2451 | ATTR_LIST(max_writeback_mb_bump), | |
2452 | NULL, | |
2453 | }; | |
2454 | ||
2455 | /* Features this copy of ext4 supports */ | |
2456 | EXT4_INFO_ATTR(lazy_itable_init); | |
2457 | EXT4_INFO_ATTR(batched_discard); | |
2458 | ||
2459 | static struct attribute *ext4_feat_attrs[] = { | |
2460 | ATTR_LIST(lazy_itable_init), | |
2461 | ATTR_LIST(batched_discard), | |
2462 | NULL, | |
2463 | }; | |
2464 | ||
2465 | static ssize_t ext4_attr_show(struct kobject *kobj, | |
2466 | struct attribute *attr, char *buf) | |
2467 | { | |
2468 | struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info, | |
2469 | s_kobj); | |
2470 | struct ext4_attr *a = container_of(attr, struct ext4_attr, attr); | |
2471 | ||
2472 | return a->show ? a->show(a, sbi, buf) : 0; | |
2473 | } | |
2474 | ||
2475 | static ssize_t ext4_attr_store(struct kobject *kobj, | |
2476 | struct attribute *attr, | |
2477 | const char *buf, size_t len) | |
2478 | { | |
2479 | struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info, | |
2480 | s_kobj); | |
2481 | struct ext4_attr *a = container_of(attr, struct ext4_attr, attr); | |
2482 | ||
2483 | return a->store ? a->store(a, sbi, buf, len) : 0; | |
2484 | } | |
2485 | ||
2486 | static void ext4_sb_release(struct kobject *kobj) | |
2487 | { | |
2488 | struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info, | |
2489 | s_kobj); | |
2490 | complete(&sbi->s_kobj_unregister); | |
2491 | } | |
2492 | ||
2493 | static const struct sysfs_ops ext4_attr_ops = { | |
2494 | .show = ext4_attr_show, | |
2495 | .store = ext4_attr_store, | |
2496 | }; | |
2497 | ||
2498 | static struct kobj_type ext4_ktype = { | |
2499 | .default_attrs = ext4_attrs, | |
2500 | .sysfs_ops = &ext4_attr_ops, | |
2501 | .release = ext4_sb_release, | |
2502 | }; | |
2503 | ||
2504 | static void ext4_feat_release(struct kobject *kobj) | |
2505 | { | |
2506 | complete(&ext4_feat->f_kobj_unregister); | |
2507 | } | |
2508 | ||
2509 | static struct kobj_type ext4_feat_ktype = { | |
2510 | .default_attrs = ext4_feat_attrs, | |
2511 | .sysfs_ops = &ext4_attr_ops, | |
2512 | .release = ext4_feat_release, | |
2513 | }; | |
2514 | ||
2515 | /* | |
2516 | * Check whether this filesystem can be mounted based on | |
2517 | * the features present and the RDONLY/RDWR mount requested. | |
2518 | * Returns 1 if this filesystem can be mounted as requested, | |
2519 | * 0 if it cannot be. | |
2520 | */ | |
2521 | static int ext4_feature_set_ok(struct super_block *sb, int readonly) | |
2522 | { | |
2523 | if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP)) { | |
2524 | ext4_msg(sb, KERN_ERR, | |
2525 | "Couldn't mount because of " | |
2526 | "unsupported optional features (%x)", | |
2527 | (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) & | |
2528 | ~EXT4_FEATURE_INCOMPAT_SUPP)); | |
2529 | return 0; | |
2530 | } | |
2531 | ||
2532 | if (readonly) | |
2533 | return 1; | |
2534 | ||
2535 | /* Check that feature set is OK for a read-write mount */ | |
2536 | if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP)) { | |
2537 | ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of " | |
2538 | "unsupported optional features (%x)", | |
2539 | (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) & | |
2540 | ~EXT4_FEATURE_RO_COMPAT_SUPP)); | |
2541 | return 0; | |
2542 | } | |
2543 | /* | |
2544 | * Large file size enabled file system can only be mounted | |
2545 | * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF | |
2546 | */ | |
2547 | if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) { | |
2548 | if (sizeof(blkcnt_t) < sizeof(u64)) { | |
2549 | ext4_msg(sb, KERN_ERR, "Filesystem with huge files " | |
2550 | "cannot be mounted RDWR without " | |
2551 | "CONFIG_LBDAF"); | |
2552 | return 0; | |
2553 | } | |
2554 | } | |
2555 | return 1; | |
2556 | } | |
2557 | ||
2558 | /* | |
2559 | * This function is called once a day if we have errors logged | |
2560 | * on the file system | |
2561 | */ | |
2562 | static void print_daily_error_info(unsigned long arg) | |
2563 | { | |
2564 | struct super_block *sb = (struct super_block *) arg; | |
2565 | struct ext4_sb_info *sbi; | |
2566 | struct ext4_super_block *es; | |
2567 | ||
2568 | sbi = EXT4_SB(sb); | |
2569 | es = sbi->s_es; | |
2570 | ||
2571 | if (es->s_error_count) | |
2572 | ext4_msg(sb, KERN_NOTICE, "error count: %u", | |
2573 | le32_to_cpu(es->s_error_count)); | |
2574 | if (es->s_first_error_time) { | |
2575 | printk(KERN_NOTICE "EXT4-fs (%s): initial error at %u: %.*s:%d", | |
2576 | sb->s_id, le32_to_cpu(es->s_first_error_time), | |
2577 | (int) sizeof(es->s_first_error_func), | |
2578 | es->s_first_error_func, | |
2579 | le32_to_cpu(es->s_first_error_line)); | |
2580 | if (es->s_first_error_ino) | |
2581 | printk(": inode %u", | |
2582 | le32_to_cpu(es->s_first_error_ino)); | |
2583 | if (es->s_first_error_block) | |
2584 | printk(": block %llu", (unsigned long long) | |
2585 | le64_to_cpu(es->s_first_error_block)); | |
2586 | printk("\n"); | |
2587 | } | |
2588 | if (es->s_last_error_time) { | |
2589 | printk(KERN_NOTICE "EXT4-fs (%s): last error at %u: %.*s:%d", | |
2590 | sb->s_id, le32_to_cpu(es->s_last_error_time), | |
2591 | (int) sizeof(es->s_last_error_func), | |
2592 | es->s_last_error_func, | |
2593 | le32_to_cpu(es->s_last_error_line)); | |
2594 | if (es->s_last_error_ino) | |
2595 | printk(": inode %u", | |
2596 | le32_to_cpu(es->s_last_error_ino)); | |
2597 | if (es->s_last_error_block) | |
2598 | printk(": block %llu", (unsigned long long) | |
2599 | le64_to_cpu(es->s_last_error_block)); | |
2600 | printk("\n"); | |
2601 | } | |
2602 | mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ); /* Once a day */ | |
2603 | } | |
2604 | ||
2605 | static void ext4_lazyinode_timeout(unsigned long data) | |
2606 | { | |
2607 | struct task_struct *p = (struct task_struct *)data; | |
2608 | wake_up_process(p); | |
2609 | } | |
2610 | ||
2611 | /* Find next suitable group and run ext4_init_inode_table */ | |
2612 | static int ext4_run_li_request(struct ext4_li_request *elr) | |
2613 | { | |
2614 | struct ext4_group_desc *gdp = NULL; | |
2615 | ext4_group_t group, ngroups; | |
2616 | struct super_block *sb; | |
2617 | unsigned long timeout = 0; | |
2618 | int ret = 0; | |
2619 | ||
2620 | sb = elr->lr_super; | |
2621 | ngroups = EXT4_SB(sb)->s_groups_count; | |
2622 | ||
2623 | for (group = elr->lr_next_group; group < ngroups; group++) { | |
2624 | gdp = ext4_get_group_desc(sb, group, NULL); | |
2625 | if (!gdp) { | |
2626 | ret = 1; | |
2627 | break; | |
2628 | } | |
2629 | ||
2630 | if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED))) | |
2631 | break; | |
2632 | } | |
2633 | ||
2634 | if (group == ngroups) | |
2635 | ret = 1; | |
2636 | ||
2637 | if (!ret) { | |
2638 | timeout = jiffies; | |
2639 | ret = ext4_init_inode_table(sb, group, | |
2640 | elr->lr_timeout ? 0 : 1); | |
2641 | if (elr->lr_timeout == 0) { | |
2642 | timeout = jiffies - timeout; | |
2643 | if (elr->lr_sbi->s_li_wait_mult) | |
2644 | timeout *= elr->lr_sbi->s_li_wait_mult; | |
2645 | else | |
2646 | timeout *= 20; | |
2647 | elr->lr_timeout = timeout; | |
2648 | } | |
2649 | elr->lr_next_sched = jiffies + elr->lr_timeout; | |
2650 | elr->lr_next_group = group + 1; | |
2651 | } | |
2652 | ||
2653 | return ret; | |
2654 | } | |
2655 | ||
2656 | /* | |
2657 | * Remove lr_request from the list_request and free the | |
2658 | * request tructure. Should be called with li_list_mtx held | |
2659 | */ | |
2660 | static void ext4_remove_li_request(struct ext4_li_request *elr) | |
2661 | { | |
2662 | struct ext4_sb_info *sbi; | |
2663 | ||
2664 | if (!elr) | |
2665 | return; | |
2666 | ||
2667 | sbi = elr->lr_sbi; | |
2668 | ||
2669 | list_del(&elr->lr_request); | |
2670 | sbi->s_li_request = NULL; | |
2671 | kfree(elr); | |
2672 | } | |
2673 | ||
2674 | static void ext4_unregister_li_request(struct super_block *sb) | |
2675 | { | |
2676 | struct ext4_li_request *elr = EXT4_SB(sb)->s_li_request; | |
2677 | ||
2678 | if (!ext4_li_info) | |
2679 | return; | |
2680 | ||
2681 | mutex_lock(&ext4_li_info->li_list_mtx); | |
2682 | ext4_remove_li_request(elr); | |
2683 | mutex_unlock(&ext4_li_info->li_list_mtx); | |
2684 | } | |
2685 | ||
2686 | /* | |
2687 | * This is the function where ext4lazyinit thread lives. It walks | |
2688 | * through the request list searching for next scheduled filesystem. | |
2689 | * When such a fs is found, run the lazy initialization request | |
2690 | * (ext4_rn_li_request) and keep track of the time spend in this | |
2691 | * function. Based on that time we compute next schedule time of | |
2692 | * the request. When walking through the list is complete, compute | |
2693 | * next waking time and put itself into sleep. | |
2694 | */ | |
2695 | static int ext4_lazyinit_thread(void *arg) | |
2696 | { | |
2697 | struct ext4_lazy_init *eli = (struct ext4_lazy_init *)arg; | |
2698 | struct list_head *pos, *n; | |
2699 | struct ext4_li_request *elr; | |
2700 | unsigned long next_wakeup; | |
2701 | DEFINE_WAIT(wait); | |
2702 | int ret; | |
2703 | ||
2704 | BUG_ON(NULL == eli); | |
2705 | ||
2706 | eli->li_timer.data = (unsigned long)current; | |
2707 | eli->li_timer.function = ext4_lazyinode_timeout; | |
2708 | ||
2709 | eli->li_task = current; | |
2710 | wake_up(&eli->li_wait_task); | |
2711 | ||
2712 | cont_thread: | |
2713 | while (true) { | |
2714 | next_wakeup = MAX_JIFFY_OFFSET; | |
2715 | ||
2716 | mutex_lock(&eli->li_list_mtx); | |
2717 | if (list_empty(&eli->li_request_list)) { | |
2718 | mutex_unlock(&eli->li_list_mtx); | |
2719 | goto exit_thread; | |
2720 | } | |
2721 | ||
2722 | list_for_each_safe(pos, n, &eli->li_request_list) { | |
2723 | elr = list_entry(pos, struct ext4_li_request, | |
2724 | lr_request); | |
2725 | ||
2726 | if (time_after_eq(jiffies, elr->lr_next_sched)) | |
2727 | ret = ext4_run_li_request(elr); | |
2728 | ||
2729 | if (ret) { | |
2730 | ret = 0; | |
2731 | ext4_remove_li_request(elr); | |
2732 | continue; | |
2733 | } | |
2734 | ||
2735 | if (time_before(elr->lr_next_sched, next_wakeup)) | |
2736 | next_wakeup = elr->lr_next_sched; | |
2737 | } | |
2738 | mutex_unlock(&eli->li_list_mtx); | |
2739 | ||
2740 | if (freezing(current)) | |
2741 | refrigerator(); | |
2742 | ||
2743 | if (time_after_eq(jiffies, next_wakeup)) { | |
2744 | cond_resched(); | |
2745 | continue; | |
2746 | } | |
2747 | ||
2748 | eli->li_timer.expires = next_wakeup; | |
2749 | add_timer(&eli->li_timer); | |
2750 | prepare_to_wait(&eli->li_wait_daemon, &wait, | |
2751 | TASK_INTERRUPTIBLE); | |
2752 | if (time_before(jiffies, next_wakeup)) | |
2753 | schedule(); | |
2754 | finish_wait(&eli->li_wait_daemon, &wait); | |
2755 | } | |
2756 | ||
2757 | exit_thread: | |
2758 | /* | |
2759 | * It looks like the request list is empty, but we need | |
2760 | * to check it under the li_list_mtx lock, to prevent any | |
2761 | * additions into it, and of course we should lock ext4_li_mtx | |
2762 | * to atomically free the list and ext4_li_info, because at | |
2763 | * this point another ext4 filesystem could be registering | |
2764 | * new one. | |
2765 | */ | |
2766 | mutex_lock(&ext4_li_mtx); | |
2767 | mutex_lock(&eli->li_list_mtx); | |
2768 | if (!list_empty(&eli->li_request_list)) { | |
2769 | mutex_unlock(&eli->li_list_mtx); | |
2770 | mutex_unlock(&ext4_li_mtx); | |
2771 | goto cont_thread; | |
2772 | } | |
2773 | mutex_unlock(&eli->li_list_mtx); | |
2774 | del_timer_sync(&ext4_li_info->li_timer); | |
2775 | eli->li_task = NULL; | |
2776 | wake_up(&eli->li_wait_task); | |
2777 | ||
2778 | kfree(ext4_li_info); | |
2779 | ext4_li_info = NULL; | |
2780 | mutex_unlock(&ext4_li_mtx); | |
2781 | ||
2782 | return 0; | |
2783 | } | |
2784 | ||
2785 | static void ext4_clear_request_list(void) | |
2786 | { | |
2787 | struct list_head *pos, *n; | |
2788 | struct ext4_li_request *elr; | |
2789 | ||
2790 | mutex_lock(&ext4_li_info->li_list_mtx); | |
2791 | if (list_empty(&ext4_li_info->li_request_list)) | |
2792 | return; | |
2793 | ||
2794 | list_for_each_safe(pos, n, &ext4_li_info->li_request_list) { | |
2795 | elr = list_entry(pos, struct ext4_li_request, | |
2796 | lr_request); | |
2797 | ext4_remove_li_request(elr); | |
2798 | } | |
2799 | mutex_unlock(&ext4_li_info->li_list_mtx); | |
2800 | } | |
2801 | ||
2802 | static int ext4_run_lazyinit_thread(void) | |
2803 | { | |
2804 | struct task_struct *t; | |
2805 | ||
2806 | t = kthread_run(ext4_lazyinit_thread, ext4_li_info, "ext4lazyinit"); | |
2807 | if (IS_ERR(t)) { | |
2808 | int err = PTR_ERR(t); | |
2809 | ext4_clear_request_list(); | |
2810 | del_timer_sync(&ext4_li_info->li_timer); | |
2811 | kfree(ext4_li_info); | |
2812 | ext4_li_info = NULL; | |
2813 | printk(KERN_CRIT "EXT4: error %d creating inode table " | |
2814 | "initialization thread\n", | |
2815 | err); | |
2816 | return err; | |
2817 | } | |
2818 | ext4_li_info->li_state |= EXT4_LAZYINIT_RUNNING; | |
2819 | ||
2820 | wait_event(ext4_li_info->li_wait_task, ext4_li_info->li_task != NULL); | |
2821 | return 0; | |
2822 | } | |
2823 | ||
2824 | /* | |
2825 | * Check whether it make sense to run itable init. thread or not. | |
2826 | * If there is at least one uninitialized inode table, return | |
2827 | * corresponding group number, else the loop goes through all | |
2828 | * groups and return total number of groups. | |
2829 | */ | |
2830 | static ext4_group_t ext4_has_uninit_itable(struct super_block *sb) | |
2831 | { | |
2832 | ext4_group_t group, ngroups = EXT4_SB(sb)->s_groups_count; | |
2833 | struct ext4_group_desc *gdp = NULL; | |
2834 | ||
2835 | for (group = 0; group < ngroups; group++) { | |
2836 | gdp = ext4_get_group_desc(sb, group, NULL); | |
2837 | if (!gdp) | |
2838 | continue; | |
2839 | ||
2840 | if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED))) | |
2841 | break; | |
2842 | } | |
2843 | ||
2844 | return group; | |
2845 | } | |
2846 | ||
2847 | static int ext4_li_info_new(void) | |
2848 | { | |
2849 | struct ext4_lazy_init *eli = NULL; | |
2850 | ||
2851 | eli = kzalloc(sizeof(*eli), GFP_KERNEL); | |
2852 | if (!eli) | |
2853 | return -ENOMEM; | |
2854 | ||
2855 | eli->li_task = NULL; | |
2856 | INIT_LIST_HEAD(&eli->li_request_list); | |
2857 | mutex_init(&eli->li_list_mtx); | |
2858 | ||
2859 | init_waitqueue_head(&eli->li_wait_daemon); | |
2860 | init_waitqueue_head(&eli->li_wait_task); | |
2861 | init_timer(&eli->li_timer); | |
2862 | eli->li_state |= EXT4_LAZYINIT_QUIT; | |
2863 | ||
2864 | ext4_li_info = eli; | |
2865 | ||
2866 | return 0; | |
2867 | } | |
2868 | ||
2869 | static struct ext4_li_request *ext4_li_request_new(struct super_block *sb, | |
2870 | ext4_group_t start) | |
2871 | { | |
2872 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
2873 | struct ext4_li_request *elr; | |
2874 | unsigned long rnd; | |
2875 | ||
2876 | elr = kzalloc(sizeof(*elr), GFP_KERNEL); | |
2877 | if (!elr) | |
2878 | return NULL; | |
2879 | ||
2880 | elr->lr_super = sb; | |
2881 | elr->lr_sbi = sbi; | |
2882 | elr->lr_next_group = start; | |
2883 | ||
2884 | /* | |
2885 | * Randomize first schedule time of the request to | |
2886 | * spread the inode table initialization requests | |
2887 | * better. | |
2888 | */ | |
2889 | get_random_bytes(&rnd, sizeof(rnd)); | |
2890 | elr->lr_next_sched = jiffies + (unsigned long)rnd % | |
2891 | (EXT4_DEF_LI_MAX_START_DELAY * HZ); | |
2892 | ||
2893 | return elr; | |
2894 | } | |
2895 | ||
2896 | static int ext4_register_li_request(struct super_block *sb, | |
2897 | ext4_group_t first_not_zeroed) | |
2898 | { | |
2899 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
2900 | struct ext4_li_request *elr; | |
2901 | ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; | |
2902 | int ret; | |
2903 | ||
2904 | if (sbi->s_li_request != NULL) | |
2905 | return 0; | |
2906 | ||
2907 | if (first_not_zeroed == ngroups || | |
2908 | (sb->s_flags & MS_RDONLY) || | |
2909 | !test_opt(sb, INIT_INODE_TABLE)) { | |
2910 | sbi->s_li_request = NULL; | |
2911 | return 0; | |
2912 | } | |
2913 | ||
2914 | if (first_not_zeroed == ngroups) { | |
2915 | sbi->s_li_request = NULL; | |
2916 | return 0; | |
2917 | } | |
2918 | ||
2919 | elr = ext4_li_request_new(sb, first_not_zeroed); | |
2920 | if (!elr) | |
2921 | return -ENOMEM; | |
2922 | ||
2923 | mutex_lock(&ext4_li_mtx); | |
2924 | ||
2925 | if (NULL == ext4_li_info) { | |
2926 | ret = ext4_li_info_new(); | |
2927 | if (ret) | |
2928 | goto out; | |
2929 | } | |
2930 | ||
2931 | mutex_lock(&ext4_li_info->li_list_mtx); | |
2932 | list_add(&elr->lr_request, &ext4_li_info->li_request_list); | |
2933 | mutex_unlock(&ext4_li_info->li_list_mtx); | |
2934 | ||
2935 | sbi->s_li_request = elr; | |
2936 | ||
2937 | if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) { | |
2938 | ret = ext4_run_lazyinit_thread(); | |
2939 | if (ret) | |
2940 | goto out; | |
2941 | } | |
2942 | out: | |
2943 | mutex_unlock(&ext4_li_mtx); | |
2944 | if (ret) | |
2945 | kfree(elr); | |
2946 | return ret; | |
2947 | } | |
2948 | ||
2949 | /* | |
2950 | * We do not need to lock anything since this is called on | |
2951 | * module unload. | |
2952 | */ | |
2953 | static void ext4_destroy_lazyinit_thread(void) | |
2954 | { | |
2955 | /* | |
2956 | * If thread exited earlier | |
2957 | * there's nothing to be done. | |
2958 | */ | |
2959 | if (!ext4_li_info) | |
2960 | return; | |
2961 | ||
2962 | ext4_clear_request_list(); | |
2963 | ||
2964 | while (ext4_li_info->li_task) { | |
2965 | wake_up(&ext4_li_info->li_wait_daemon); | |
2966 | wait_event(ext4_li_info->li_wait_task, | |
2967 | ext4_li_info->li_task == NULL); | |
2968 | } | |
2969 | } | |
2970 | ||
2971 | static int ext4_fill_super(struct super_block *sb, void *data, int silent) | |
2972 | __releases(kernel_lock) | |
2973 | __acquires(kernel_lock) | |
2974 | { | |
2975 | char *orig_data = kstrdup(data, GFP_KERNEL); | |
2976 | struct buffer_head *bh; | |
2977 | struct ext4_super_block *es = NULL; | |
2978 | struct ext4_sb_info *sbi; | |
2979 | ext4_fsblk_t block; | |
2980 | ext4_fsblk_t sb_block = get_sb_block(&data); | |
2981 | ext4_fsblk_t logical_sb_block; | |
2982 | unsigned long offset = 0; | |
2983 | unsigned long journal_devnum = 0; | |
2984 | unsigned long def_mount_opts; | |
2985 | struct inode *root; | |
2986 | char *cp; | |
2987 | const char *descr; | |
2988 | int ret = -ENOMEM; | |
2989 | int blocksize; | |
2990 | unsigned int db_count; | |
2991 | unsigned int i; | |
2992 | int needs_recovery, has_huge_files; | |
2993 | __u64 blocks_count; | |
2994 | int err; | |
2995 | unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO; | |
2996 | ext4_group_t first_not_zeroed; | |
2997 | ||
2998 | sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); | |
2999 | if (!sbi) | |
3000 | goto out_free_orig; | |
3001 | ||
3002 | sbi->s_blockgroup_lock = | |
3003 | kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL); | |
3004 | if (!sbi->s_blockgroup_lock) { | |
3005 | kfree(sbi); | |
3006 | goto out_free_orig; | |
3007 | } | |
3008 | sb->s_fs_info = sbi; | |
3009 | sbi->s_mount_opt = 0; | |
3010 | sbi->s_resuid = EXT4_DEF_RESUID; | |
3011 | sbi->s_resgid = EXT4_DEF_RESGID; | |
3012 | sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS; | |
3013 | sbi->s_sb_block = sb_block; | |
3014 | if (sb->s_bdev->bd_part) | |
3015 | sbi->s_sectors_written_start = | |
3016 | part_stat_read(sb->s_bdev->bd_part, sectors[1]); | |
3017 | ||
3018 | /* Cleanup superblock name */ | |
3019 | for (cp = sb->s_id; (cp = strchr(cp, '/'));) | |
3020 | *cp = '!'; | |
3021 | ||
3022 | ret = -EINVAL; | |
3023 | blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE); | |
3024 | if (!blocksize) { | |
3025 | ext4_msg(sb, KERN_ERR, "unable to set blocksize"); | |
3026 | goto out_fail; | |
3027 | } | |
3028 | ||
3029 | /* | |
3030 | * The ext4 superblock will not be buffer aligned for other than 1kB | |
3031 | * block sizes. We need to calculate the offset from buffer start. | |
3032 | */ | |
3033 | if (blocksize != EXT4_MIN_BLOCK_SIZE) { | |
3034 | logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE; | |
3035 | offset = do_div(logical_sb_block, blocksize); | |
3036 | } else { | |
3037 | logical_sb_block = sb_block; | |
3038 | } | |
3039 | ||
3040 | if (!(bh = sb_bread(sb, logical_sb_block))) { | |
3041 | ext4_msg(sb, KERN_ERR, "unable to read superblock"); | |
3042 | goto out_fail; | |
3043 | } | |
3044 | /* | |
3045 | * Note: s_es must be initialized as soon as possible because | |
3046 | * some ext4 macro-instructions depend on its value | |
3047 | */ | |
3048 | es = (struct ext4_super_block *) (((char *)bh->b_data) + offset); | |
3049 | sbi->s_es = es; | |
3050 | sb->s_magic = le16_to_cpu(es->s_magic); | |
3051 | if (sb->s_magic != EXT4_SUPER_MAGIC) | |
3052 | goto cantfind_ext4; | |
3053 | sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written); | |
3054 | ||
3055 | /* Set defaults before we parse the mount options */ | |
3056 | def_mount_opts = le32_to_cpu(es->s_default_mount_opts); | |
3057 | set_opt(sbi->s_mount_opt, INIT_INODE_TABLE); | |
3058 | if (def_mount_opts & EXT4_DEFM_DEBUG) | |
3059 | set_opt(sbi->s_mount_opt, DEBUG); | |
3060 | if (def_mount_opts & EXT4_DEFM_BSDGROUPS) { | |
3061 | ext4_msg(sb, KERN_WARNING, deprecated_msg, "bsdgroups", | |
3062 | "2.6.38"); | |
3063 | set_opt(sbi->s_mount_opt, GRPID); | |
3064 | } | |
3065 | if (def_mount_opts & EXT4_DEFM_UID16) | |
3066 | set_opt(sbi->s_mount_opt, NO_UID32); | |
3067 | #ifdef CONFIG_EXT4_FS_XATTR | |
3068 | if (def_mount_opts & EXT4_DEFM_XATTR_USER) | |
3069 | set_opt(sbi->s_mount_opt, XATTR_USER); | |
3070 | #endif | |
3071 | #ifdef CONFIG_EXT4_FS_POSIX_ACL | |
3072 | if (def_mount_opts & EXT4_DEFM_ACL) | |
3073 | set_opt(sbi->s_mount_opt, POSIX_ACL); | |
3074 | #endif | |
3075 | if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA) | |
3076 | set_opt(sbi->s_mount_opt, JOURNAL_DATA); | |
3077 | else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED) | |
3078 | set_opt(sbi->s_mount_opt, ORDERED_DATA); | |
3079 | else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK) | |
3080 | set_opt(sbi->s_mount_opt, WRITEBACK_DATA); | |
3081 | ||
3082 | if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC) | |
3083 | set_opt(sbi->s_mount_opt, ERRORS_PANIC); | |
3084 | else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE) | |
3085 | set_opt(sbi->s_mount_opt, ERRORS_CONT); | |
3086 | else | |
3087 | set_opt(sbi->s_mount_opt, ERRORS_RO); | |
3088 | if (def_mount_opts & EXT4_DEFM_BLOCK_VALIDITY) | |
3089 | set_opt(sbi->s_mount_opt, BLOCK_VALIDITY); | |
3090 | if (def_mount_opts & EXT4_DEFM_DISCARD) | |
3091 | set_opt(sbi->s_mount_opt, DISCARD); | |
3092 | ||
3093 | sbi->s_resuid = le16_to_cpu(es->s_def_resuid); | |
3094 | sbi->s_resgid = le16_to_cpu(es->s_def_resgid); | |
3095 | sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ; | |
3096 | sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME; | |
3097 | sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME; | |
3098 | ||
3099 | if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0) | |
3100 | set_opt(sbi->s_mount_opt, BARRIER); | |
3101 | ||
3102 | /* | |
3103 | * enable delayed allocation by default | |
3104 | * Use -o nodelalloc to turn it off | |
3105 | */ | |
3106 | if (!IS_EXT3_SB(sb) && | |
3107 | ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0)) | |
3108 | set_opt(sbi->s_mount_opt, DELALLOC); | |
3109 | ||
3110 | if (!parse_options((char *) sbi->s_es->s_mount_opts, sb, | |
3111 | &journal_devnum, &journal_ioprio, NULL, 0)) { | |
3112 | ext4_msg(sb, KERN_WARNING, | |
3113 | "failed to parse options in superblock: %s", | |
3114 | sbi->s_es->s_mount_opts); | |
3115 | } | |
3116 | if (!parse_options((char *) data, sb, &journal_devnum, | |
3117 | &journal_ioprio, NULL, 0)) | |
3118 | goto failed_mount; | |
3119 | ||
3120 | sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | | |
3121 | (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0); | |
3122 | ||
3123 | if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV && | |
3124 | (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) || | |
3125 | EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) || | |
3126 | EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U))) | |
3127 | ext4_msg(sb, KERN_WARNING, | |
3128 | "feature flags set on rev 0 fs, " | |
3129 | "running e2fsck is recommended"); | |
3130 | ||
3131 | /* | |
3132 | * Check feature flags regardless of the revision level, since we | |
3133 | * previously didn't change the revision level when setting the flags, | |
3134 | * so there is a chance incompat flags are set on a rev 0 filesystem. | |
3135 | */ | |
3136 | if (!ext4_feature_set_ok(sb, (sb->s_flags & MS_RDONLY))) | |
3137 | goto failed_mount; | |
3138 | ||
3139 | blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size); | |
3140 | ||
3141 | if (blocksize < EXT4_MIN_BLOCK_SIZE || | |
3142 | blocksize > EXT4_MAX_BLOCK_SIZE) { | |
3143 | ext4_msg(sb, KERN_ERR, | |
3144 | "Unsupported filesystem blocksize %d", blocksize); | |
3145 | goto failed_mount; | |
3146 | } | |
3147 | ||
3148 | if (sb->s_blocksize != blocksize) { | |
3149 | /* Validate the filesystem blocksize */ | |
3150 | if (!sb_set_blocksize(sb, blocksize)) { | |
3151 | ext4_msg(sb, KERN_ERR, "bad block size %d", | |
3152 | blocksize); | |
3153 | goto failed_mount; | |
3154 | } | |
3155 | ||
3156 | brelse(bh); | |
3157 | logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE; | |
3158 | offset = do_div(logical_sb_block, blocksize); | |
3159 | bh = sb_bread(sb, logical_sb_block); | |
3160 | if (!bh) { | |
3161 | ext4_msg(sb, KERN_ERR, | |
3162 | "Can't read superblock on 2nd try"); | |
3163 | goto failed_mount; | |
3164 | } | |
3165 | es = (struct ext4_super_block *)(((char *)bh->b_data) + offset); | |
3166 | sbi->s_es = es; | |
3167 | if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) { | |
3168 | ext4_msg(sb, KERN_ERR, | |
3169 | "Magic mismatch, very weird!"); | |
3170 | goto failed_mount; | |
3171 | } | |
3172 | } | |
3173 | ||
3174 | has_huge_files = EXT4_HAS_RO_COMPAT_FEATURE(sb, | |
3175 | EXT4_FEATURE_RO_COMPAT_HUGE_FILE); | |
3176 | sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits, | |
3177 | has_huge_files); | |
3178 | sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files); | |
3179 | ||
3180 | if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) { | |
3181 | sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE; | |
3182 | sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO; | |
3183 | } else { | |
3184 | sbi->s_inode_size = le16_to_cpu(es->s_inode_size); | |
3185 | sbi->s_first_ino = le32_to_cpu(es->s_first_ino); | |
3186 | if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) || | |
3187 | (!is_power_of_2(sbi->s_inode_size)) || | |
3188 | (sbi->s_inode_size > blocksize)) { | |
3189 | ext4_msg(sb, KERN_ERR, | |
3190 | "unsupported inode size: %d", | |
3191 | sbi->s_inode_size); | |
3192 | goto failed_mount; | |
3193 | } | |
3194 | if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) | |
3195 | sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2); | |
3196 | } | |
3197 | ||
3198 | sbi->s_desc_size = le16_to_cpu(es->s_desc_size); | |
3199 | if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) { | |
3200 | if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT || | |
3201 | sbi->s_desc_size > EXT4_MAX_DESC_SIZE || | |
3202 | !is_power_of_2(sbi->s_desc_size)) { | |
3203 | ext4_msg(sb, KERN_ERR, | |
3204 | "unsupported descriptor size %lu", | |
3205 | sbi->s_desc_size); | |
3206 | goto failed_mount; | |
3207 | } | |
3208 | } else | |
3209 | sbi->s_desc_size = EXT4_MIN_DESC_SIZE; | |
3210 | ||
3211 | sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group); | |
3212 | sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group); | |
3213 | if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0) | |
3214 | goto cantfind_ext4; | |
3215 | ||
3216 | sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb); | |
3217 | if (sbi->s_inodes_per_block == 0) | |
3218 | goto cantfind_ext4; | |
3219 | sbi->s_itb_per_group = sbi->s_inodes_per_group / | |
3220 | sbi->s_inodes_per_block; | |
3221 | sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb); | |
3222 | sbi->s_sbh = bh; | |
3223 | sbi->s_mount_state = le16_to_cpu(es->s_state); | |
3224 | sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb)); | |
3225 | sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb)); | |
3226 | ||
3227 | for (i = 0; i < 4; i++) | |
3228 | sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]); | |
3229 | sbi->s_def_hash_version = es->s_def_hash_version; | |
3230 | i = le32_to_cpu(es->s_flags); | |
3231 | if (i & EXT2_FLAGS_UNSIGNED_HASH) | |
3232 | sbi->s_hash_unsigned = 3; | |
3233 | else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) { | |
3234 | #ifdef __CHAR_UNSIGNED__ | |
3235 | es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH); | |
3236 | sbi->s_hash_unsigned = 3; | |
3237 | #else | |
3238 | es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH); | |
3239 | #endif | |
3240 | sb->s_dirt = 1; | |
3241 | } | |
3242 | ||
3243 | if (sbi->s_blocks_per_group > blocksize * 8) { | |
3244 | ext4_msg(sb, KERN_ERR, | |
3245 | "#blocks per group too big: %lu", | |
3246 | sbi->s_blocks_per_group); | |
3247 | goto failed_mount; | |
3248 | } | |
3249 | if (sbi->s_inodes_per_group > blocksize * 8) { | |
3250 | ext4_msg(sb, KERN_ERR, | |
3251 | "#inodes per group too big: %lu", | |
3252 | sbi->s_inodes_per_group); | |
3253 | goto failed_mount; | |
3254 | } | |
3255 | ||
3256 | /* | |
3257 | * Test whether we have more sectors than will fit in sector_t, | |
3258 | * and whether the max offset is addressable by the page cache. | |
3259 | */ | |
3260 | ret = generic_check_addressable(sb->s_blocksize_bits, | |
3261 | ext4_blocks_count(es)); | |
3262 | if (ret) { | |
3263 | ext4_msg(sb, KERN_ERR, "filesystem" | |
3264 | " too large to mount safely on this system"); | |
3265 | if (sizeof(sector_t) < 8) | |
3266 | ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled"); | |
3267 | goto failed_mount; | |
3268 | } | |
3269 | ||
3270 | if (EXT4_BLOCKS_PER_GROUP(sb) == 0) | |
3271 | goto cantfind_ext4; | |
3272 | ||
3273 | /* check blocks count against device size */ | |
3274 | blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits; | |
3275 | if (blocks_count && ext4_blocks_count(es) > blocks_count) { | |
3276 | ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu " | |
3277 | "exceeds size of device (%llu blocks)", | |
3278 | ext4_blocks_count(es), blocks_count); | |
3279 | goto failed_mount; | |
3280 | } | |
3281 | ||
3282 | /* | |
3283 | * It makes no sense for the first data block to be beyond the end | |
3284 | * of the filesystem. | |
3285 | */ | |
3286 | if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) { | |
3287 | ext4_msg(sb, KERN_WARNING, "bad geometry: first data" | |
3288 | "block %u is beyond end of filesystem (%llu)", | |
3289 | le32_to_cpu(es->s_first_data_block), | |
3290 | ext4_blocks_count(es)); | |
3291 | goto failed_mount; | |
3292 | } | |
3293 | blocks_count = (ext4_blocks_count(es) - | |
3294 | le32_to_cpu(es->s_first_data_block) + | |
3295 | EXT4_BLOCKS_PER_GROUP(sb) - 1); | |
3296 | do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb)); | |
3297 | if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) { | |
3298 | ext4_msg(sb, KERN_WARNING, "groups count too large: %u " | |
3299 | "(block count %llu, first data block %u, " | |
3300 | "blocks per group %lu)", sbi->s_groups_count, | |
3301 | ext4_blocks_count(es), | |
3302 | le32_to_cpu(es->s_first_data_block), | |
3303 | EXT4_BLOCKS_PER_GROUP(sb)); | |
3304 | goto failed_mount; | |
3305 | } | |
3306 | sbi->s_groups_count = blocks_count; | |
3307 | sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count, | |
3308 | (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb))); | |
3309 | db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) / | |
3310 | EXT4_DESC_PER_BLOCK(sb); | |
3311 | sbi->s_group_desc = kmalloc(db_count * sizeof(struct buffer_head *), | |
3312 | GFP_KERNEL); | |
3313 | if (sbi->s_group_desc == NULL) { | |
3314 | ext4_msg(sb, KERN_ERR, "not enough memory"); | |
3315 | goto failed_mount; | |
3316 | } | |
3317 | ||
3318 | #ifdef CONFIG_PROC_FS | |
3319 | if (ext4_proc_root) | |
3320 | sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root); | |
3321 | #endif | |
3322 | ||
3323 | bgl_lock_init(sbi->s_blockgroup_lock); | |
3324 | ||
3325 | for (i = 0; i < db_count; i++) { | |
3326 | block = descriptor_loc(sb, logical_sb_block, i); | |
3327 | sbi->s_group_desc[i] = sb_bread(sb, block); | |
3328 | if (!sbi->s_group_desc[i]) { | |
3329 | ext4_msg(sb, KERN_ERR, | |
3330 | "can't read group descriptor %d", i); | |
3331 | db_count = i; | |
3332 | goto failed_mount2; | |
3333 | } | |
3334 | } | |
3335 | if (!ext4_check_descriptors(sb, &first_not_zeroed)) { | |
3336 | ext4_msg(sb, KERN_ERR, "group descriptors corrupted!"); | |
3337 | goto failed_mount2; | |
3338 | } | |
3339 | if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG)) | |
3340 | if (!ext4_fill_flex_info(sb)) { | |
3341 | ext4_msg(sb, KERN_ERR, | |
3342 | "unable to initialize " | |
3343 | "flex_bg meta info!"); | |
3344 | goto failed_mount2; | |
3345 | } | |
3346 | ||
3347 | sbi->s_gdb_count = db_count; | |
3348 | get_random_bytes(&sbi->s_next_generation, sizeof(u32)); | |
3349 | spin_lock_init(&sbi->s_next_gen_lock); | |
3350 | ||
3351 | sbi->s_stripe = ext4_get_stripe_size(sbi); | |
3352 | sbi->s_max_writeback_mb_bump = 128; | |
3353 | ||
3354 | /* | |
3355 | * set up enough so that it can read an inode | |
3356 | */ | |
3357 | if (!test_opt(sb, NOLOAD) && | |
3358 | EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) | |
3359 | sb->s_op = &ext4_sops; | |
3360 | else | |
3361 | sb->s_op = &ext4_nojournal_sops; | |
3362 | sb->s_export_op = &ext4_export_ops; | |
3363 | sb->s_xattr = ext4_xattr_handlers; | |
3364 | #ifdef CONFIG_QUOTA | |
3365 | sb->s_qcop = &ext4_qctl_operations; | |
3366 | sb->dq_op = &ext4_quota_operations; | |
3367 | #endif | |
3368 | INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */ | |
3369 | mutex_init(&sbi->s_orphan_lock); | |
3370 | mutex_init(&sbi->s_resize_lock); | |
3371 | ||
3372 | sb->s_root = NULL; | |
3373 | ||
3374 | needs_recovery = (es->s_last_orphan != 0 || | |
3375 | EXT4_HAS_INCOMPAT_FEATURE(sb, | |
3376 | EXT4_FEATURE_INCOMPAT_RECOVER)); | |
3377 | ||
3378 | /* | |
3379 | * The first inode we look at is the journal inode. Don't try | |
3380 | * root first: it may be modified in the journal! | |
3381 | */ | |
3382 | if (!test_opt(sb, NOLOAD) && | |
3383 | EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) { | |
3384 | if (ext4_load_journal(sb, es, journal_devnum)) | |
3385 | goto failed_mount3; | |
3386 | } else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) && | |
3387 | EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) { | |
3388 | ext4_msg(sb, KERN_ERR, "required journal recovery " | |
3389 | "suppressed and not mounted read-only"); | |
3390 | goto failed_mount_wq; | |
3391 | } else { | |
3392 | clear_opt(sbi->s_mount_opt, DATA_FLAGS); | |
3393 | set_opt(sbi->s_mount_opt, WRITEBACK_DATA); | |
3394 | sbi->s_journal = NULL; | |
3395 | needs_recovery = 0; | |
3396 | goto no_journal; | |
3397 | } | |
3398 | ||
3399 | if (ext4_blocks_count(es) > 0xffffffffULL && | |
3400 | !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0, | |
3401 | JBD2_FEATURE_INCOMPAT_64BIT)) { | |
3402 | ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature"); | |
3403 | goto failed_mount_wq; | |
3404 | } | |
3405 | ||
3406 | if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) { | |
3407 | jbd2_journal_set_features(sbi->s_journal, | |
3408 | JBD2_FEATURE_COMPAT_CHECKSUM, 0, | |
3409 | JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT); | |
3410 | } else if (test_opt(sb, JOURNAL_CHECKSUM)) { | |
3411 | jbd2_journal_set_features(sbi->s_journal, | |
3412 | JBD2_FEATURE_COMPAT_CHECKSUM, 0, 0); | |
3413 | jbd2_journal_clear_features(sbi->s_journal, 0, 0, | |
3414 | JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT); | |
3415 | } else { | |
3416 | jbd2_journal_clear_features(sbi->s_journal, | |
3417 | JBD2_FEATURE_COMPAT_CHECKSUM, 0, | |
3418 | JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT); | |
3419 | } | |
3420 | ||
3421 | /* We have now updated the journal if required, so we can | |
3422 | * validate the data journaling mode. */ | |
3423 | switch (test_opt(sb, DATA_FLAGS)) { | |
3424 | case 0: | |
3425 | /* No mode set, assume a default based on the journal | |
3426 | * capabilities: ORDERED_DATA if the journal can | |
3427 | * cope, else JOURNAL_DATA | |
3428 | */ | |
3429 | if (jbd2_journal_check_available_features | |
3430 | (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) | |
3431 | set_opt(sbi->s_mount_opt, ORDERED_DATA); | |
3432 | else | |
3433 | set_opt(sbi->s_mount_opt, JOURNAL_DATA); | |
3434 | break; | |
3435 | ||
3436 | case EXT4_MOUNT_ORDERED_DATA: | |
3437 | case EXT4_MOUNT_WRITEBACK_DATA: | |
3438 | if (!jbd2_journal_check_available_features | |
3439 | (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) { | |
3440 | ext4_msg(sb, KERN_ERR, "Journal does not support " | |
3441 | "requested data journaling mode"); | |
3442 | goto failed_mount_wq; | |
3443 | } | |
3444 | default: | |
3445 | break; | |
3446 | } | |
3447 | set_task_ioprio(sbi->s_journal->j_task, journal_ioprio); | |
3448 | ||
3449 | no_journal: | |
3450 | err = percpu_counter_init(&sbi->s_freeblocks_counter, | |
3451 | ext4_count_free_blocks(sb)); | |
3452 | if (!err) | |
3453 | err = percpu_counter_init(&sbi->s_freeinodes_counter, | |
3454 | ext4_count_free_inodes(sb)); | |
3455 | if (!err) | |
3456 | err = percpu_counter_init(&sbi->s_dirs_counter, | |
3457 | ext4_count_dirs(sb)); | |
3458 | if (!err) | |
3459 | err = percpu_counter_init(&sbi->s_dirtyblocks_counter, 0); | |
3460 | if (err) { | |
3461 | ext4_msg(sb, KERN_ERR, "insufficient memory"); | |
3462 | goto failed_mount_wq; | |
3463 | } | |
3464 | ||
3465 | EXT4_SB(sb)->dio_unwritten_wq = create_workqueue("ext4-dio-unwritten"); | |
3466 | if (!EXT4_SB(sb)->dio_unwritten_wq) { | |
3467 | printk(KERN_ERR "EXT4-fs: failed to create DIO workqueue\n"); | |
3468 | goto failed_mount_wq; | |
3469 | } | |
3470 | ||
3471 | /* | |
3472 | * The jbd2_journal_load will have done any necessary log recovery, | |
3473 | * so we can safely mount the rest of the filesystem now. | |
3474 | */ | |
3475 | ||
3476 | root = ext4_iget(sb, EXT4_ROOT_INO); | |
3477 | if (IS_ERR(root)) { | |
3478 | ext4_msg(sb, KERN_ERR, "get root inode failed"); | |
3479 | ret = PTR_ERR(root); | |
3480 | goto failed_mount4; | |
3481 | } | |
3482 | if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { | |
3483 | iput(root); | |
3484 | ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck"); | |
3485 | goto failed_mount4; | |
3486 | } | |
3487 | sb->s_root = d_alloc_root(root); | |
3488 | if (!sb->s_root) { | |
3489 | ext4_msg(sb, KERN_ERR, "get root dentry failed"); | |
3490 | iput(root); | |
3491 | ret = -ENOMEM; | |
3492 | goto failed_mount4; | |
3493 | } | |
3494 | ||
3495 | ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY); | |
3496 | ||
3497 | /* determine the minimum size of new large inodes, if present */ | |
3498 | if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) { | |
3499 | sbi->s_want_extra_isize = sizeof(struct ext4_inode) - | |
3500 | EXT4_GOOD_OLD_INODE_SIZE; | |
3501 | if (EXT4_HAS_RO_COMPAT_FEATURE(sb, | |
3502 | EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) { | |
3503 | if (sbi->s_want_extra_isize < | |
3504 | le16_to_cpu(es->s_want_extra_isize)) | |
3505 | sbi->s_want_extra_isize = | |
3506 | le16_to_cpu(es->s_want_extra_isize); | |
3507 | if (sbi->s_want_extra_isize < | |
3508 | le16_to_cpu(es->s_min_extra_isize)) | |
3509 | sbi->s_want_extra_isize = | |
3510 | le16_to_cpu(es->s_min_extra_isize); | |
3511 | } | |
3512 | } | |
3513 | /* Check if enough inode space is available */ | |
3514 | if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize > | |
3515 | sbi->s_inode_size) { | |
3516 | sbi->s_want_extra_isize = sizeof(struct ext4_inode) - | |
3517 | EXT4_GOOD_OLD_INODE_SIZE; | |
3518 | ext4_msg(sb, KERN_INFO, "required extra inode space not" | |
3519 | "available"); | |
3520 | } | |
3521 | ||
3522 | if (test_opt(sb, DELALLOC) && | |
3523 | (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)) { | |
3524 | ext4_msg(sb, KERN_WARNING, "Ignoring delalloc option - " | |
3525 | "requested data journaling mode"); | |
3526 | clear_opt(sbi->s_mount_opt, DELALLOC); | |
3527 | } | |
3528 | if (test_opt(sb, DIOREAD_NOLOCK)) { | |
3529 | if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) { | |
3530 | ext4_msg(sb, KERN_WARNING, "Ignoring dioread_nolock " | |
3531 | "option - requested data journaling mode"); | |
3532 | clear_opt(sbi->s_mount_opt, DIOREAD_NOLOCK); | |
3533 | } | |
3534 | if (sb->s_blocksize < PAGE_SIZE) { | |
3535 | ext4_msg(sb, KERN_WARNING, "Ignoring dioread_nolock " | |
3536 | "option - block size is too small"); | |
3537 | clear_opt(sbi->s_mount_opt, DIOREAD_NOLOCK); | |
3538 | } | |
3539 | } | |
3540 | ||
3541 | err = ext4_setup_system_zone(sb); | |
3542 | if (err) { | |
3543 | ext4_msg(sb, KERN_ERR, "failed to initialize system " | |
3544 | "zone (%d)", err); | |
3545 | goto failed_mount4; | |
3546 | } | |
3547 | ||
3548 | ext4_ext_init(sb); | |
3549 | err = ext4_mb_init(sb, needs_recovery); | |
3550 | if (err) { | |
3551 | ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)", | |
3552 | err); | |
3553 | goto failed_mount4; | |
3554 | } | |
3555 | ||
3556 | err = ext4_register_li_request(sb, first_not_zeroed); | |
3557 | if (err) | |
3558 | goto failed_mount4; | |
3559 | ||
3560 | sbi->s_kobj.kset = ext4_kset; | |
3561 | init_completion(&sbi->s_kobj_unregister); | |
3562 | err = kobject_init_and_add(&sbi->s_kobj, &ext4_ktype, NULL, | |
3563 | "%s", sb->s_id); | |
3564 | if (err) { | |
3565 | ext4_mb_release(sb); | |
3566 | ext4_ext_release(sb); | |
3567 | goto failed_mount4; | |
3568 | }; | |
3569 | ||
3570 | EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS; | |
3571 | ext4_orphan_cleanup(sb, es); | |
3572 | EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS; | |
3573 | if (needs_recovery) { | |
3574 | ext4_msg(sb, KERN_INFO, "recovery complete"); | |
3575 | ext4_mark_recovery_complete(sb, es); | |
3576 | } | |
3577 | if (EXT4_SB(sb)->s_journal) { | |
3578 | if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) | |
3579 | descr = " journalled data mode"; | |
3580 | else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) | |
3581 | descr = " ordered data mode"; | |
3582 | else | |
3583 | descr = " writeback data mode"; | |
3584 | } else | |
3585 | descr = "out journal"; | |
3586 | ||
3587 | ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. " | |
3588 | "Opts: %s%s%s", descr, sbi->s_es->s_mount_opts, | |
3589 | *sbi->s_es->s_mount_opts ? "; " : "", orig_data); | |
3590 | ||
3591 | init_timer(&sbi->s_err_report); | |
3592 | sbi->s_err_report.function = print_daily_error_info; | |
3593 | sbi->s_err_report.data = (unsigned long) sb; | |
3594 | if (es->s_error_count) | |
3595 | mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */ | |
3596 | ||
3597 | kfree(orig_data); | |
3598 | return 0; | |
3599 | ||
3600 | cantfind_ext4: | |
3601 | if (!silent) | |
3602 | ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem"); | |
3603 | goto failed_mount; | |
3604 | ||
3605 | failed_mount4: | |
3606 | ext4_msg(sb, KERN_ERR, "mount failed"); | |
3607 | destroy_workqueue(EXT4_SB(sb)->dio_unwritten_wq); | |
3608 | failed_mount_wq: | |
3609 | ext4_release_system_zone(sb); | |
3610 | if (sbi->s_journal) { | |
3611 | jbd2_journal_destroy(sbi->s_journal); | |
3612 | sbi->s_journal = NULL; | |
3613 | } | |
3614 | percpu_counter_destroy(&sbi->s_freeblocks_counter); | |
3615 | percpu_counter_destroy(&sbi->s_freeinodes_counter); | |
3616 | percpu_counter_destroy(&sbi->s_dirs_counter); | |
3617 | percpu_counter_destroy(&sbi->s_dirtyblocks_counter); | |
3618 | failed_mount3: | |
3619 | if (sbi->s_flex_groups) { | |
3620 | if (is_vmalloc_addr(sbi->s_flex_groups)) | |
3621 | vfree(sbi->s_flex_groups); | |
3622 | else | |
3623 | kfree(sbi->s_flex_groups); | |
3624 | } | |
3625 | failed_mount2: | |
3626 | for (i = 0; i < db_count; i++) | |
3627 | brelse(sbi->s_group_desc[i]); | |
3628 | kfree(sbi->s_group_desc); | |
3629 | failed_mount: | |
3630 | if (sbi->s_proc) { | |
3631 | remove_proc_entry(sb->s_id, ext4_proc_root); | |
3632 | } | |
3633 | #ifdef CONFIG_QUOTA | |
3634 | for (i = 0; i < MAXQUOTAS; i++) | |
3635 | kfree(sbi->s_qf_names[i]); | |
3636 | #endif | |
3637 | ext4_blkdev_remove(sbi); | |
3638 | brelse(bh); | |
3639 | out_fail: | |
3640 | sb->s_fs_info = NULL; | |
3641 | kfree(sbi->s_blockgroup_lock); | |
3642 | kfree(sbi); | |
3643 | out_free_orig: | |
3644 | kfree(orig_data); | |
3645 | return ret; | |
3646 | } | |
3647 | ||
3648 | /* | |
3649 | * Setup any per-fs journal parameters now. We'll do this both on | |
3650 | * initial mount, once the journal has been initialised but before we've | |
3651 | * done any recovery; and again on any subsequent remount. | |
3652 | */ | |
3653 | static void ext4_init_journal_params(struct super_block *sb, journal_t *journal) | |
3654 | { | |
3655 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
3656 | ||
3657 | journal->j_commit_interval = sbi->s_commit_interval; | |
3658 | journal->j_min_batch_time = sbi->s_min_batch_time; | |
3659 | journal->j_max_batch_time = sbi->s_max_batch_time; | |
3660 | ||
3661 | write_lock(&journal->j_state_lock); | |
3662 | if (test_opt(sb, BARRIER)) | |
3663 | journal->j_flags |= JBD2_BARRIER; | |
3664 | else | |
3665 | journal->j_flags &= ~JBD2_BARRIER; | |
3666 | if (test_opt(sb, DATA_ERR_ABORT)) | |
3667 | journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR; | |
3668 | else | |
3669 | journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR; | |
3670 | write_unlock(&journal->j_state_lock); | |
3671 | } | |
3672 | ||
3673 | static journal_t *ext4_get_journal(struct super_block *sb, | |
3674 | unsigned int journal_inum) | |
3675 | { | |
3676 | struct inode *journal_inode; | |
3677 | journal_t *journal; | |
3678 | ||
3679 | BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)); | |
3680 | ||
3681 | /* First, test for the existence of a valid inode on disk. Bad | |
3682 | * things happen if we iget() an unused inode, as the subsequent | |
3683 | * iput() will try to delete it. */ | |
3684 | ||
3685 | journal_inode = ext4_iget(sb, journal_inum); | |
3686 | if (IS_ERR(journal_inode)) { | |
3687 | ext4_msg(sb, KERN_ERR, "no journal found"); | |
3688 | return NULL; | |
3689 | } | |
3690 | if (!journal_inode->i_nlink) { | |
3691 | make_bad_inode(journal_inode); | |
3692 | iput(journal_inode); | |
3693 | ext4_msg(sb, KERN_ERR, "journal inode is deleted"); | |
3694 | return NULL; | |
3695 | } | |
3696 | ||
3697 | jbd_debug(2, "Journal inode found at %p: %lld bytes\n", | |
3698 | journal_inode, journal_inode->i_size); | |
3699 | if (!S_ISREG(journal_inode->i_mode)) { | |
3700 | ext4_msg(sb, KERN_ERR, "invalid journal inode"); | |
3701 | iput(journal_inode); | |
3702 | return NULL; | |
3703 | } | |
3704 | ||
3705 | journal = jbd2_journal_init_inode(journal_inode); | |
3706 | if (!journal) { | |
3707 | ext4_msg(sb, KERN_ERR, "Could not load journal inode"); | |
3708 | iput(journal_inode); | |
3709 | return NULL; | |
3710 | } | |
3711 | journal->j_private = sb; | |
3712 | ext4_init_journal_params(sb, journal); | |
3713 | return journal; | |
3714 | } | |
3715 | ||
3716 | static journal_t *ext4_get_dev_journal(struct super_block *sb, | |
3717 | dev_t j_dev) | |
3718 | { | |
3719 | struct buffer_head *bh; | |
3720 | journal_t *journal; | |
3721 | ext4_fsblk_t start; | |
3722 | ext4_fsblk_t len; | |
3723 | int hblock, blocksize; | |
3724 | ext4_fsblk_t sb_block; | |
3725 | unsigned long offset; | |
3726 | struct ext4_super_block *es; | |
3727 | struct block_device *bdev; | |
3728 | ||
3729 | BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)); | |
3730 | ||
3731 | bdev = ext4_blkdev_get(j_dev, sb); | |
3732 | if (bdev == NULL) | |
3733 | return NULL; | |
3734 | ||
3735 | if (bd_claim(bdev, sb)) { | |
3736 | ext4_msg(sb, KERN_ERR, | |
3737 | "failed to claim external journal device"); | |
3738 | blkdev_put(bdev, FMODE_READ|FMODE_WRITE); | |
3739 | return NULL; | |
3740 | } | |
3741 | ||
3742 | blocksize = sb->s_blocksize; | |
3743 | hblock = bdev_logical_block_size(bdev); | |
3744 | if (blocksize < hblock) { | |
3745 | ext4_msg(sb, KERN_ERR, | |
3746 | "blocksize too small for journal device"); | |
3747 | goto out_bdev; | |
3748 | } | |
3749 | ||
3750 | sb_block = EXT4_MIN_BLOCK_SIZE / blocksize; | |
3751 | offset = EXT4_MIN_BLOCK_SIZE % blocksize; | |
3752 | set_blocksize(bdev, blocksize); | |
3753 | if (!(bh = __bread(bdev, sb_block, blocksize))) { | |
3754 | ext4_msg(sb, KERN_ERR, "couldn't read superblock of " | |
3755 | "external journal"); | |
3756 | goto out_bdev; | |
3757 | } | |
3758 | ||
3759 | es = (struct ext4_super_block *) (((char *)bh->b_data) + offset); | |
3760 | if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) || | |
3761 | !(le32_to_cpu(es->s_feature_incompat) & | |
3762 | EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) { | |
3763 | ext4_msg(sb, KERN_ERR, "external journal has " | |
3764 | "bad superblock"); | |
3765 | brelse(bh); | |
3766 | goto out_bdev; | |
3767 | } | |
3768 | ||
3769 | if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) { | |
3770 | ext4_msg(sb, KERN_ERR, "journal UUID does not match"); | |
3771 | brelse(bh); | |
3772 | goto out_bdev; | |
3773 | } | |
3774 | ||
3775 | len = ext4_blocks_count(es); | |
3776 | start = sb_block + 1; | |
3777 | brelse(bh); /* we're done with the superblock */ | |
3778 | ||
3779 | journal = jbd2_journal_init_dev(bdev, sb->s_bdev, | |
3780 | start, len, blocksize); | |
3781 | if (!journal) { | |
3782 | ext4_msg(sb, KERN_ERR, "failed to create device journal"); | |
3783 | goto out_bdev; | |
3784 | } | |
3785 | journal->j_private = sb; | |
3786 | ll_rw_block(READ, 1, &journal->j_sb_buffer); | |
3787 | wait_on_buffer(journal->j_sb_buffer); | |
3788 | if (!buffer_uptodate(journal->j_sb_buffer)) { | |
3789 | ext4_msg(sb, KERN_ERR, "I/O error on journal device"); | |
3790 | goto out_journal; | |
3791 | } | |
3792 | if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) { | |
3793 | ext4_msg(sb, KERN_ERR, "External journal has more than one " | |
3794 | "user (unsupported) - %d", | |
3795 | be32_to_cpu(journal->j_superblock->s_nr_users)); | |
3796 | goto out_journal; | |
3797 | } | |
3798 | EXT4_SB(sb)->journal_bdev = bdev; | |
3799 | ext4_init_journal_params(sb, journal); | |
3800 | return journal; | |
3801 | ||
3802 | out_journal: | |
3803 | jbd2_journal_destroy(journal); | |
3804 | out_bdev: | |
3805 | ext4_blkdev_put(bdev); | |
3806 | return NULL; | |
3807 | } | |
3808 | ||
3809 | static int ext4_load_journal(struct super_block *sb, | |
3810 | struct ext4_super_block *es, | |
3811 | unsigned long journal_devnum) | |
3812 | { | |
3813 | journal_t *journal; | |
3814 | unsigned int journal_inum = le32_to_cpu(es->s_journal_inum); | |
3815 | dev_t journal_dev; | |
3816 | int err = 0; | |
3817 | int really_read_only; | |
3818 | ||
3819 | BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)); | |
3820 | ||
3821 | if (journal_devnum && | |
3822 | journal_devnum != le32_to_cpu(es->s_journal_dev)) { | |
3823 | ext4_msg(sb, KERN_INFO, "external journal device major/minor " | |
3824 | "numbers have changed"); | |
3825 | journal_dev = new_decode_dev(journal_devnum); | |
3826 | } else | |
3827 | journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev)); | |
3828 | ||
3829 | really_read_only = bdev_read_only(sb->s_bdev); | |
3830 | ||
3831 | /* | |
3832 | * Are we loading a blank journal or performing recovery after a | |
3833 | * crash? For recovery, we need to check in advance whether we | |
3834 | * can get read-write access to the device. | |
3835 | */ | |
3836 | if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) { | |
3837 | if (sb->s_flags & MS_RDONLY) { | |
3838 | ext4_msg(sb, KERN_INFO, "INFO: recovery " | |
3839 | "required on readonly filesystem"); | |
3840 | if (really_read_only) { | |
3841 | ext4_msg(sb, KERN_ERR, "write access " | |
3842 | "unavailable, cannot proceed"); | |
3843 | return -EROFS; | |
3844 | } | |
3845 | ext4_msg(sb, KERN_INFO, "write access will " | |
3846 | "be enabled during recovery"); | |
3847 | } | |
3848 | } | |
3849 | ||
3850 | if (journal_inum && journal_dev) { | |
3851 | ext4_msg(sb, KERN_ERR, "filesystem has both journal " | |
3852 | "and inode journals!"); | |
3853 | return -EINVAL; | |
3854 | } | |
3855 | ||
3856 | if (journal_inum) { | |
3857 | if (!(journal = ext4_get_journal(sb, journal_inum))) | |
3858 | return -EINVAL; | |
3859 | } else { | |
3860 | if (!(journal = ext4_get_dev_journal(sb, journal_dev))) | |
3861 | return -EINVAL; | |
3862 | } | |
3863 | ||
3864 | if (!(journal->j_flags & JBD2_BARRIER)) | |
3865 | ext4_msg(sb, KERN_INFO, "barriers disabled"); | |
3866 | ||
3867 | if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) { | |
3868 | err = jbd2_journal_update_format(journal); | |
3869 | if (err) { | |
3870 | ext4_msg(sb, KERN_ERR, "error updating journal"); | |
3871 | jbd2_journal_destroy(journal); | |
3872 | return err; | |
3873 | } | |
3874 | } | |
3875 | ||
3876 | if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) | |
3877 | err = jbd2_journal_wipe(journal, !really_read_only); | |
3878 | if (!err) { | |
3879 | char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL); | |
3880 | if (save) | |
3881 | memcpy(save, ((char *) es) + | |
3882 | EXT4_S_ERR_START, EXT4_S_ERR_LEN); | |
3883 | err = jbd2_journal_load(journal); | |
3884 | if (save) | |
3885 | memcpy(((char *) es) + EXT4_S_ERR_START, | |
3886 | save, EXT4_S_ERR_LEN); | |
3887 | kfree(save); | |
3888 | } | |
3889 | ||
3890 | if (err) { | |
3891 | ext4_msg(sb, KERN_ERR, "error loading journal"); | |
3892 | jbd2_journal_destroy(journal); | |
3893 | return err; | |
3894 | } | |
3895 | ||
3896 | EXT4_SB(sb)->s_journal = journal; | |
3897 | ext4_clear_journal_err(sb, es); | |
3898 | ||
3899 | if (!really_read_only && journal_devnum && | |
3900 | journal_devnum != le32_to_cpu(es->s_journal_dev)) { | |
3901 | es->s_journal_dev = cpu_to_le32(journal_devnum); | |
3902 | ||
3903 | /* Make sure we flush the recovery flag to disk. */ | |
3904 | ext4_commit_super(sb, 1); | |
3905 | } | |
3906 | ||
3907 | return 0; | |
3908 | } | |
3909 | ||
3910 | static int ext4_commit_super(struct super_block *sb, int sync) | |
3911 | { | |
3912 | struct ext4_super_block *es = EXT4_SB(sb)->s_es; | |
3913 | struct buffer_head *sbh = EXT4_SB(sb)->s_sbh; | |
3914 | int error = 0; | |
3915 | ||
3916 | if (!sbh) | |
3917 | return error; | |
3918 | if (buffer_write_io_error(sbh)) { | |
3919 | /* | |
3920 | * Oh, dear. A previous attempt to write the | |
3921 | * superblock failed. This could happen because the | |
3922 | * USB device was yanked out. Or it could happen to | |
3923 | * be a transient write error and maybe the block will | |
3924 | * be remapped. Nothing we can do but to retry the | |
3925 | * write and hope for the best. | |
3926 | */ | |
3927 | ext4_msg(sb, KERN_ERR, "previous I/O error to " | |
3928 | "superblock detected"); | |
3929 | clear_buffer_write_io_error(sbh); | |
3930 | set_buffer_uptodate(sbh); | |
3931 | } | |
3932 | /* | |
3933 | * If the file system is mounted read-only, don't update the | |
3934 | * superblock write time. This avoids updating the superblock | |
3935 | * write time when we are mounting the root file system | |
3936 | * read/only but we need to replay the journal; at that point, | |
3937 | * for people who are east of GMT and who make their clock | |
3938 | * tick in localtime for Windows bug-for-bug compatibility, | |
3939 | * the clock is set in the future, and this will cause e2fsck | |
3940 | * to complain and force a full file system check. | |
3941 | */ | |
3942 | if (!(sb->s_flags & MS_RDONLY)) | |
3943 | es->s_wtime = cpu_to_le32(get_seconds()); | |
3944 | if (sb->s_bdev->bd_part) | |
3945 | es->s_kbytes_written = | |
3946 | cpu_to_le64(EXT4_SB(sb)->s_kbytes_written + | |
3947 | ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) - | |
3948 | EXT4_SB(sb)->s_sectors_written_start) >> 1)); | |
3949 | else | |
3950 | es->s_kbytes_written = | |
3951 | cpu_to_le64(EXT4_SB(sb)->s_kbytes_written); | |
3952 | if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeblocks_counter)) | |
3953 | ext4_free_blocks_count_set(es, percpu_counter_sum_positive( | |
3954 | &EXT4_SB(sb)->s_freeblocks_counter)); | |
3955 | if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeinodes_counter)) | |
3956 | es->s_free_inodes_count = | |
3957 | cpu_to_le32(percpu_counter_sum_positive( | |
3958 | &EXT4_SB(sb)->s_freeinodes_counter)); | |
3959 | sb->s_dirt = 0; | |
3960 | BUFFER_TRACE(sbh, "marking dirty"); | |
3961 | mark_buffer_dirty(sbh); | |
3962 | if (sync) { | |
3963 | error = sync_dirty_buffer(sbh); | |
3964 | if (error) | |
3965 | return error; | |
3966 | ||
3967 | error = buffer_write_io_error(sbh); | |
3968 | if (error) { | |
3969 | ext4_msg(sb, KERN_ERR, "I/O error while writing " | |
3970 | "superblock"); | |
3971 | clear_buffer_write_io_error(sbh); | |
3972 | set_buffer_uptodate(sbh); | |
3973 | } | |
3974 | } | |
3975 | return error; | |
3976 | } | |
3977 | ||
3978 | /* | |
3979 | * Have we just finished recovery? If so, and if we are mounting (or | |
3980 | * remounting) the filesystem readonly, then we will end up with a | |
3981 | * consistent fs on disk. Record that fact. | |
3982 | */ | |
3983 | static void ext4_mark_recovery_complete(struct super_block *sb, | |
3984 | struct ext4_super_block *es) | |
3985 | { | |
3986 | journal_t *journal = EXT4_SB(sb)->s_journal; | |
3987 | ||
3988 | if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) { | |
3989 | BUG_ON(journal != NULL); | |
3990 | return; | |
3991 | } | |
3992 | jbd2_journal_lock_updates(journal); | |
3993 | if (jbd2_journal_flush(journal) < 0) | |
3994 | goto out; | |
3995 | ||
3996 | if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) && | |
3997 | sb->s_flags & MS_RDONLY) { | |
3998 | EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); | |
3999 | ext4_commit_super(sb, 1); | |
4000 | } | |
4001 | ||
4002 | out: | |
4003 | jbd2_journal_unlock_updates(journal); | |
4004 | } | |
4005 | ||
4006 | /* | |
4007 | * If we are mounting (or read-write remounting) a filesystem whose journal | |
4008 | * has recorded an error from a previous lifetime, move that error to the | |
4009 | * main filesystem now. | |
4010 | */ | |
4011 | static void ext4_clear_journal_err(struct super_block *sb, | |
4012 | struct ext4_super_block *es) | |
4013 | { | |
4014 | journal_t *journal; | |
4015 | int j_errno; | |
4016 | const char *errstr; | |
4017 | ||
4018 | BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)); | |
4019 | ||
4020 | journal = EXT4_SB(sb)->s_journal; | |
4021 | ||
4022 | /* | |
4023 | * Now check for any error status which may have been recorded in the | |
4024 | * journal by a prior ext4_error() or ext4_abort() | |
4025 | */ | |
4026 | ||
4027 | j_errno = jbd2_journal_errno(journal); | |
4028 | if (j_errno) { | |
4029 | char nbuf[16]; | |
4030 | ||
4031 | errstr = ext4_decode_error(sb, j_errno, nbuf); | |
4032 | ext4_warning(sb, "Filesystem error recorded " | |
4033 | "from previous mount: %s", errstr); | |
4034 | ext4_warning(sb, "Marking fs in need of filesystem check."); | |
4035 | ||
4036 | EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; | |
4037 | es->s_state |= cpu_to_le16(EXT4_ERROR_FS); | |
4038 | ext4_commit_super(sb, 1); | |
4039 | ||
4040 | jbd2_journal_clear_err(journal); | |
4041 | } | |
4042 | } | |
4043 | ||
4044 | /* | |
4045 | * Force the running and committing transactions to commit, | |
4046 | * and wait on the commit. | |
4047 | */ | |
4048 | int ext4_force_commit(struct super_block *sb) | |
4049 | { | |
4050 | journal_t *journal; | |
4051 | int ret = 0; | |
4052 | ||
4053 | if (sb->s_flags & MS_RDONLY) | |
4054 | return 0; | |
4055 | ||
4056 | journal = EXT4_SB(sb)->s_journal; | |
4057 | if (journal) { | |
4058 | vfs_check_frozen(sb, SB_FREEZE_TRANS); | |
4059 | ret = ext4_journal_force_commit(journal); | |
4060 | } | |
4061 | ||
4062 | return ret; | |
4063 | } | |
4064 | ||
4065 | static void ext4_write_super(struct super_block *sb) | |
4066 | { | |
4067 | lock_super(sb); | |
4068 | ext4_commit_super(sb, 1); | |
4069 | unlock_super(sb); | |
4070 | } | |
4071 | ||
4072 | static int ext4_sync_fs(struct super_block *sb, int wait) | |
4073 | { | |
4074 | int ret = 0; | |
4075 | tid_t target; | |
4076 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
4077 | ||
4078 | trace_ext4_sync_fs(sb, wait); | |
4079 | flush_workqueue(sbi->dio_unwritten_wq); | |
4080 | if (jbd2_journal_start_commit(sbi->s_journal, &target)) { | |
4081 | if (wait) | |
4082 | jbd2_log_wait_commit(sbi->s_journal, target); | |
4083 | } | |
4084 | return ret; | |
4085 | } | |
4086 | ||
4087 | /* | |
4088 | * LVM calls this function before a (read-only) snapshot is created. This | |
4089 | * gives us a chance to flush the journal completely and mark the fs clean. | |
4090 | */ | |
4091 | static int ext4_freeze(struct super_block *sb) | |
4092 | { | |
4093 | int error = 0; | |
4094 | journal_t *journal; | |
4095 | ||
4096 | if (sb->s_flags & MS_RDONLY) | |
4097 | return 0; | |
4098 | ||
4099 | journal = EXT4_SB(sb)->s_journal; | |
4100 | ||
4101 | /* Now we set up the journal barrier. */ | |
4102 | jbd2_journal_lock_updates(journal); | |
4103 | ||
4104 | /* | |
4105 | * Don't clear the needs_recovery flag if we failed to flush | |
4106 | * the journal. | |
4107 | */ | |
4108 | error = jbd2_journal_flush(journal); | |
4109 | if (error < 0) | |
4110 | goto out; | |
4111 | ||
4112 | /* Journal blocked and flushed, clear needs_recovery flag. */ | |
4113 | EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); | |
4114 | error = ext4_commit_super(sb, 1); | |
4115 | out: | |
4116 | /* we rely on s_frozen to stop further updates */ | |
4117 | jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); | |
4118 | return error; | |
4119 | } | |
4120 | ||
4121 | /* | |
4122 | * Called by LVM after the snapshot is done. We need to reset the RECOVER | |
4123 | * flag here, even though the filesystem is not technically dirty yet. | |
4124 | */ | |
4125 | static int ext4_unfreeze(struct super_block *sb) | |
4126 | { | |
4127 | if (sb->s_flags & MS_RDONLY) | |
4128 | return 0; | |
4129 | ||
4130 | lock_super(sb); | |
4131 | /* Reset the needs_recovery flag before the fs is unlocked. */ | |
4132 | EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); | |
4133 | ext4_commit_super(sb, 1); | |
4134 | unlock_super(sb); | |
4135 | return 0; | |
4136 | } | |
4137 | ||
4138 | static int ext4_remount(struct super_block *sb, int *flags, char *data) | |
4139 | { | |
4140 | struct ext4_super_block *es; | |
4141 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
4142 | ext4_fsblk_t n_blocks_count = 0; | |
4143 | unsigned long old_sb_flags; | |
4144 | struct ext4_mount_options old_opts; | |
4145 | int enable_quota = 0; | |
4146 | ext4_group_t g; | |
4147 | unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO; | |
4148 | int err; | |
4149 | #ifdef CONFIG_QUOTA | |
4150 | int i; | |
4151 | #endif | |
4152 | char *orig_data = kstrdup(data, GFP_KERNEL); | |
4153 | ||
4154 | /* Store the original options */ | |
4155 | lock_super(sb); | |
4156 | old_sb_flags = sb->s_flags; | |
4157 | old_opts.s_mount_opt = sbi->s_mount_opt; | |
4158 | old_opts.s_resuid = sbi->s_resuid; | |
4159 | old_opts.s_resgid = sbi->s_resgid; | |
4160 | old_opts.s_commit_interval = sbi->s_commit_interval; | |
4161 | old_opts.s_min_batch_time = sbi->s_min_batch_time; | |
4162 | old_opts.s_max_batch_time = sbi->s_max_batch_time; | |
4163 | #ifdef CONFIG_QUOTA | |
4164 | old_opts.s_jquota_fmt = sbi->s_jquota_fmt; | |
4165 | for (i = 0; i < MAXQUOTAS; i++) | |
4166 | old_opts.s_qf_names[i] = sbi->s_qf_names[i]; | |
4167 | #endif | |
4168 | if (sbi->s_journal && sbi->s_journal->j_task->io_context) | |
4169 | journal_ioprio = sbi->s_journal->j_task->io_context->ioprio; | |
4170 | ||
4171 | /* | |
4172 | * Allow the "check" option to be passed as a remount option. | |
4173 | */ | |
4174 | if (!parse_options(data, sb, NULL, &journal_ioprio, | |
4175 | &n_blocks_count, 1)) { | |
4176 | err = -EINVAL; | |
4177 | goto restore_opts; | |
4178 | } | |
4179 | ||
4180 | if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) | |
4181 | ext4_abort(sb, "Abort forced by user"); | |
4182 | ||
4183 | sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | | |
4184 | (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0); | |
4185 | ||
4186 | es = sbi->s_es; | |
4187 | ||
4188 | if (sbi->s_journal) { | |
4189 | ext4_init_journal_params(sb, sbi->s_journal); | |
4190 | set_task_ioprio(sbi->s_journal->j_task, journal_ioprio); | |
4191 | } | |
4192 | ||
4193 | if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) || | |
4194 | n_blocks_count > ext4_blocks_count(es)) { | |
4195 | if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) { | |
4196 | err = -EROFS; | |
4197 | goto restore_opts; | |
4198 | } | |
4199 | ||
4200 | if (*flags & MS_RDONLY) { | |
4201 | err = dquot_suspend(sb, -1); | |
4202 | if (err < 0) | |
4203 | goto restore_opts; | |
4204 | ||
4205 | /* | |
4206 | * First of all, the unconditional stuff we have to do | |
4207 | * to disable replay of the journal when we next remount | |
4208 | */ | |
4209 | sb->s_flags |= MS_RDONLY; | |
4210 | ||
4211 | /* | |
4212 | * OK, test if we are remounting a valid rw partition | |
4213 | * readonly, and if so set the rdonly flag and then | |
4214 | * mark the partition as valid again. | |
4215 | */ | |
4216 | if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) && | |
4217 | (sbi->s_mount_state & EXT4_VALID_FS)) | |
4218 | es->s_state = cpu_to_le16(sbi->s_mount_state); | |
4219 | ||
4220 | if (sbi->s_journal) | |
4221 | ext4_mark_recovery_complete(sb, es); | |
4222 | } else { | |
4223 | /* Make sure we can mount this feature set readwrite */ | |
4224 | if (!ext4_feature_set_ok(sb, 0)) { | |
4225 | err = -EROFS; | |
4226 | goto restore_opts; | |
4227 | } | |
4228 | /* | |
4229 | * Make sure the group descriptor checksums | |
4230 | * are sane. If they aren't, refuse to remount r/w. | |
4231 | */ | |
4232 | for (g = 0; g < sbi->s_groups_count; g++) { | |
4233 | struct ext4_group_desc *gdp = | |
4234 | ext4_get_group_desc(sb, g, NULL); | |
4235 | ||
4236 | if (!ext4_group_desc_csum_verify(sbi, g, gdp)) { | |
4237 | ext4_msg(sb, KERN_ERR, | |
4238 | "ext4_remount: Checksum for group %u failed (%u!=%u)", | |
4239 | g, le16_to_cpu(ext4_group_desc_csum(sbi, g, gdp)), | |
4240 | le16_to_cpu(gdp->bg_checksum)); | |
4241 | err = -EINVAL; | |
4242 | goto restore_opts; | |
4243 | } | |
4244 | } | |
4245 | ||
4246 | /* | |
4247 | * If we have an unprocessed orphan list hanging | |
4248 | * around from a previously readonly bdev mount, | |
4249 | * require a full umount/remount for now. | |
4250 | */ | |
4251 | if (es->s_last_orphan) { | |
4252 | ext4_msg(sb, KERN_WARNING, "Couldn't " | |
4253 | "remount RDWR because of unprocessed " | |
4254 | "orphan inode list. Please " | |
4255 | "umount/remount instead"); | |
4256 | err = -EINVAL; | |
4257 | goto restore_opts; | |
4258 | } | |
4259 | ||
4260 | /* | |
4261 | * Mounting a RDONLY partition read-write, so reread | |
4262 | * and store the current valid flag. (It may have | |
4263 | * been changed by e2fsck since we originally mounted | |
4264 | * the partition.) | |
4265 | */ | |
4266 | if (sbi->s_journal) | |
4267 | ext4_clear_journal_err(sb, es); | |
4268 | sbi->s_mount_state = le16_to_cpu(es->s_state); | |
4269 | if ((err = ext4_group_extend(sb, es, n_blocks_count))) | |
4270 | goto restore_opts; | |
4271 | if (!ext4_setup_super(sb, es, 0)) | |
4272 | sb->s_flags &= ~MS_RDONLY; | |
4273 | enable_quota = 1; | |
4274 | } | |
4275 | } | |
4276 | ||
4277 | /* | |
4278 | * Reinitialize lazy itable initialization thread based on | |
4279 | * current settings | |
4280 | */ | |
4281 | if ((sb->s_flags & MS_RDONLY) || !test_opt(sb, INIT_INODE_TABLE)) | |
4282 | ext4_unregister_li_request(sb); | |
4283 | else { | |
4284 | ext4_group_t first_not_zeroed; | |
4285 | first_not_zeroed = ext4_has_uninit_itable(sb); | |
4286 | ext4_register_li_request(sb, first_not_zeroed); | |
4287 | } | |
4288 | ||
4289 | ext4_setup_system_zone(sb); | |
4290 | if (sbi->s_journal == NULL) | |
4291 | ext4_commit_super(sb, 1); | |
4292 | ||
4293 | #ifdef CONFIG_QUOTA | |
4294 | /* Release old quota file names */ | |
4295 | for (i = 0; i < MAXQUOTAS; i++) | |
4296 | if (old_opts.s_qf_names[i] && | |
4297 | old_opts.s_qf_names[i] != sbi->s_qf_names[i]) | |
4298 | kfree(old_opts.s_qf_names[i]); | |
4299 | #endif | |
4300 | unlock_super(sb); | |
4301 | if (enable_quota) | |
4302 | dquot_resume(sb, -1); | |
4303 | ||
4304 | ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s", orig_data); | |
4305 | kfree(orig_data); | |
4306 | return 0; | |
4307 | ||
4308 | restore_opts: | |
4309 | sb->s_flags = old_sb_flags; | |
4310 | sbi->s_mount_opt = old_opts.s_mount_opt; | |
4311 | sbi->s_resuid = old_opts.s_resuid; | |
4312 | sbi->s_resgid = old_opts.s_resgid; | |
4313 | sbi->s_commit_interval = old_opts.s_commit_interval; | |
4314 | sbi->s_min_batch_time = old_opts.s_min_batch_time; | |
4315 | sbi->s_max_batch_time = old_opts.s_max_batch_time; | |
4316 | #ifdef CONFIG_QUOTA | |
4317 | sbi->s_jquota_fmt = old_opts.s_jquota_fmt; | |
4318 | for (i = 0; i < MAXQUOTAS; i++) { | |
4319 | if (sbi->s_qf_names[i] && | |
4320 | old_opts.s_qf_names[i] != sbi->s_qf_names[i]) | |
4321 | kfree(sbi->s_qf_names[i]); | |
4322 | sbi->s_qf_names[i] = old_opts.s_qf_names[i]; | |
4323 | } | |
4324 | #endif | |
4325 | unlock_super(sb); | |
4326 | kfree(orig_data); | |
4327 | return err; | |
4328 | } | |
4329 | ||
4330 | static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf) | |
4331 | { | |
4332 | struct super_block *sb = dentry->d_sb; | |
4333 | struct ext4_sb_info *sbi = EXT4_SB(sb); | |
4334 | struct ext4_super_block *es = sbi->s_es; | |
4335 | u64 fsid; | |
4336 | ||
4337 | if (test_opt(sb, MINIX_DF)) { | |
4338 | sbi->s_overhead_last = 0; | |
4339 | } else if (sbi->s_blocks_last != ext4_blocks_count(es)) { | |
4340 | ext4_group_t i, ngroups = ext4_get_groups_count(sb); | |
4341 | ext4_fsblk_t overhead = 0; | |
4342 | ||
4343 | /* | |
4344 | * Compute the overhead (FS structures). This is constant | |
4345 | * for a given filesystem unless the number of block groups | |
4346 | * changes so we cache the previous value until it does. | |
4347 | */ | |
4348 | ||
4349 | /* | |
4350 | * All of the blocks before first_data_block are | |
4351 | * overhead | |
4352 | */ | |
4353 | overhead = le32_to_cpu(es->s_first_data_block); | |
4354 | ||
4355 | /* | |
4356 | * Add the overhead attributed to the superblock and | |
4357 | * block group descriptors. If the sparse superblocks | |
4358 | * feature is turned on, then not all groups have this. | |
4359 | */ | |
4360 | for (i = 0; i < ngroups; i++) { | |
4361 | overhead += ext4_bg_has_super(sb, i) + | |
4362 | ext4_bg_num_gdb(sb, i); | |
4363 | cond_resched(); | |
4364 | } | |
4365 | ||
4366 | /* | |
4367 | * Every block group has an inode bitmap, a block | |
4368 | * bitmap, and an inode table. | |
4369 | */ | |
4370 | overhead += ngroups * (2 + sbi->s_itb_per_group); | |
4371 | sbi->s_overhead_last = overhead; | |
4372 | smp_wmb(); | |
4373 | sbi->s_blocks_last = ext4_blocks_count(es); | |
4374 | } | |
4375 | ||
4376 | buf->f_type = EXT4_SUPER_MAGIC; | |
4377 | buf->f_bsize = sb->s_blocksize; | |
4378 | buf->f_blocks = ext4_blocks_count(es) - sbi->s_overhead_last; | |
4379 | buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter) - | |
4380 | percpu_counter_sum_positive(&sbi->s_dirtyblocks_counter); | |
4381 | buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es); | |
4382 | if (buf->f_bfree < ext4_r_blocks_count(es)) | |
4383 | buf->f_bavail = 0; | |
4384 | buf->f_files = le32_to_cpu(es->s_inodes_count); | |
4385 | buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter); | |
4386 | buf->f_namelen = EXT4_NAME_LEN; | |
4387 | fsid = le64_to_cpup((void *)es->s_uuid) ^ | |
4388 | le64_to_cpup((void *)es->s_uuid + sizeof(u64)); | |
4389 | buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL; | |
4390 | buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL; | |
4391 | ||
4392 | return 0; | |
4393 | } | |
4394 | ||
4395 | /* Helper function for writing quotas on sync - we need to start transaction | |
4396 | * before quota file is locked for write. Otherwise the are possible deadlocks: | |
4397 | * Process 1 Process 2 | |
4398 | * ext4_create() quota_sync() | |
4399 | * jbd2_journal_start() write_dquot() | |
4400 | * dquot_initialize() down(dqio_mutex) | |
4401 | * down(dqio_mutex) jbd2_journal_start() | |
4402 | * | |
4403 | */ | |
4404 | ||
4405 | #ifdef CONFIG_QUOTA | |
4406 | ||
4407 | static inline struct inode *dquot_to_inode(struct dquot *dquot) | |
4408 | { | |
4409 | return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type]; | |
4410 | } | |
4411 | ||
4412 | static int ext4_write_dquot(struct dquot *dquot) | |
4413 | { | |
4414 | int ret, err; | |
4415 | handle_t *handle; | |
4416 | struct inode *inode; | |
4417 | ||
4418 | inode = dquot_to_inode(dquot); | |
4419 | handle = ext4_journal_start(inode, | |
4420 | EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb)); | |
4421 | if (IS_ERR(handle)) | |
4422 | return PTR_ERR(handle); | |
4423 | ret = dquot_commit(dquot); | |
4424 | err = ext4_journal_stop(handle); | |
4425 | if (!ret) | |
4426 | ret = err; | |
4427 | return ret; | |
4428 | } | |
4429 | ||
4430 | static int ext4_acquire_dquot(struct dquot *dquot) | |
4431 | { | |
4432 | int ret, err; | |
4433 | handle_t *handle; | |
4434 | ||
4435 | handle = ext4_journal_start(dquot_to_inode(dquot), | |
4436 | EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb)); | |
4437 | if (IS_ERR(handle)) | |
4438 | return PTR_ERR(handle); | |
4439 | ret = dquot_acquire(dquot); | |
4440 | err = ext4_journal_stop(handle); | |
4441 | if (!ret) | |
4442 | ret = err; | |
4443 | return ret; | |
4444 | } | |
4445 | ||
4446 | static int ext4_release_dquot(struct dquot *dquot) | |
4447 | { | |
4448 | int ret, err; | |
4449 | handle_t *handle; | |
4450 | ||
4451 | handle = ext4_journal_start(dquot_to_inode(dquot), | |
4452 | EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb)); | |
4453 | if (IS_ERR(handle)) { | |
4454 | /* Release dquot anyway to avoid endless cycle in dqput() */ | |
4455 | dquot_release(dquot); | |
4456 | return PTR_ERR(handle); | |
4457 | } | |
4458 | ret = dquot_release(dquot); | |
4459 | err = ext4_journal_stop(handle); | |
4460 | if (!ret) | |
4461 | ret = err; | |
4462 | return ret; | |
4463 | } | |
4464 | ||
4465 | static int ext4_mark_dquot_dirty(struct dquot *dquot) | |
4466 | { | |
4467 | /* Are we journaling quotas? */ | |
4468 | if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] || | |
4469 | EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) { | |
4470 | dquot_mark_dquot_dirty(dquot); | |
4471 | return ext4_write_dquot(dquot); | |
4472 | } else { | |
4473 | return dquot_mark_dquot_dirty(dquot); | |
4474 | } | |
4475 | } | |
4476 | ||
4477 | static int ext4_write_info(struct super_block *sb, int type) | |
4478 | { | |
4479 | int ret, err; | |
4480 | handle_t *handle; | |
4481 | ||
4482 | /* Data block + inode block */ | |
4483 | handle = ext4_journal_start(sb->s_root->d_inode, 2); | |
4484 | if (IS_ERR(handle)) | |
4485 | return PTR_ERR(handle); | |
4486 | ret = dquot_commit_info(sb, type); | |
4487 | err = ext4_journal_stop(handle); | |
4488 | if (!ret) | |
4489 | ret = err; | |
4490 | return ret; | |
4491 | } | |
4492 | ||
4493 | /* | |
4494 | * Turn on quotas during mount time - we need to find | |
4495 | * the quota file and such... | |
4496 | */ | |
4497 | static int ext4_quota_on_mount(struct super_block *sb, int type) | |
4498 | { | |
4499 | return dquot_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type], | |
4500 | EXT4_SB(sb)->s_jquota_fmt, type); | |
4501 | } | |
4502 | ||
4503 | /* | |
4504 | * Standard function to be called on quota_on | |
4505 | */ | |
4506 | static int ext4_quota_on(struct super_block *sb, int type, int format_id, | |
4507 | char *name) | |
4508 | { | |
4509 | int err; | |
4510 | struct path path; | |
4511 | ||
4512 | if (!test_opt(sb, QUOTA)) | |
4513 | return -EINVAL; | |
4514 | ||
4515 | err = kern_path(name, LOOKUP_FOLLOW, &path); | |
4516 | if (err) | |
4517 | return err; | |
4518 | ||
4519 | /* Quotafile not on the same filesystem? */ | |
4520 | if (path.mnt->mnt_sb != sb) { | |
4521 | path_put(&path); | |
4522 | return -EXDEV; | |
4523 | } | |
4524 | /* Journaling quota? */ | |
4525 | if (EXT4_SB(sb)->s_qf_names[type]) { | |
4526 | /* Quotafile not in fs root? */ | |
4527 | if (path.dentry->d_parent != sb->s_root) | |
4528 | ext4_msg(sb, KERN_WARNING, | |
4529 | "Quota file not on filesystem root. " | |
4530 | "Journaled quota will not work"); | |
4531 | } | |
4532 | ||
4533 | /* | |
4534 | * When we journal data on quota file, we have to flush journal to see | |
4535 | * all updates to the file when we bypass pagecache... | |
4536 | */ | |
4537 | if (EXT4_SB(sb)->s_journal && | |
4538 | ext4_should_journal_data(path.dentry->d_inode)) { | |
4539 | /* | |
4540 | * We don't need to lock updates but journal_flush() could | |
4541 | * otherwise be livelocked... | |
4542 | */ | |
4543 | jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal); | |
4544 | err = jbd2_journal_flush(EXT4_SB(sb)->s_journal); | |
4545 | jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); | |
4546 | if (err) { | |
4547 | path_put(&path); | |
4548 | return err; | |
4549 | } | |
4550 | } | |
4551 | ||
4552 | err = dquot_quota_on_path(sb, type, format_id, &path); | |
4553 | path_put(&path); | |
4554 | return err; | |
4555 | } | |
4556 | ||
4557 | static int ext4_quota_off(struct super_block *sb, int type) | |
4558 | { | |
4559 | /* Force all delayed allocation blocks to be allocated */ | |
4560 | if (test_opt(sb, DELALLOC)) { | |
4561 | down_read(&sb->s_umount); | |
4562 | sync_filesystem(sb); | |
4563 | up_read(&sb->s_umount); | |
4564 | } | |
4565 | ||
4566 | return dquot_quota_off(sb, type); | |
4567 | } | |
4568 | ||
4569 | /* Read data from quotafile - avoid pagecache and such because we cannot afford | |
4570 | * acquiring the locks... As quota files are never truncated and quota code | |
4571 | * itself serializes the operations (and noone else should touch the files) | |
4572 | * we don't have to be afraid of races */ | |
4573 | static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data, | |
4574 | size_t len, loff_t off) | |
4575 | { | |
4576 | struct inode *inode = sb_dqopt(sb)->files[type]; | |
4577 | ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb); | |
4578 | int err = 0; | |
4579 | int offset = off & (sb->s_blocksize - 1); | |
4580 | int tocopy; | |
4581 | size_t toread; | |
4582 | struct buffer_head *bh; | |
4583 | loff_t i_size = i_size_read(inode); | |
4584 | ||
4585 | if (off > i_size) | |
4586 | return 0; | |
4587 | if (off+len > i_size) | |
4588 | len = i_size-off; | |
4589 | toread = len; | |
4590 | while (toread > 0) { | |
4591 | tocopy = sb->s_blocksize - offset < toread ? | |
4592 | sb->s_blocksize - offset : toread; | |
4593 | bh = ext4_bread(NULL, inode, blk, 0, &err); | |
4594 | if (err) | |
4595 | return err; | |
4596 | if (!bh) /* A hole? */ | |
4597 | memset(data, 0, tocopy); | |
4598 | else | |
4599 | memcpy(data, bh->b_data+offset, tocopy); | |
4600 | brelse(bh); | |
4601 | offset = 0; | |
4602 | toread -= tocopy; | |
4603 | data += tocopy; | |
4604 | blk++; | |
4605 | } | |
4606 | return len; | |
4607 | } | |
4608 | ||
4609 | /* Write to quotafile (we know the transaction is already started and has | |
4610 | * enough credits) */ | |
4611 | static ssize_t ext4_quota_write(struct super_block *sb, int type, | |
4612 | const char *data, size_t len, loff_t off) | |
4613 | { | |
4614 | struct inode *inode = sb_dqopt(sb)->files[type]; | |
4615 | ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb); | |
4616 | int err = 0; | |
4617 | int offset = off & (sb->s_blocksize - 1); | |
4618 | struct buffer_head *bh; | |
4619 | handle_t *handle = journal_current_handle(); | |
4620 | ||
4621 | if (EXT4_SB(sb)->s_journal && !handle) { | |
4622 | ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)" | |
4623 | " cancelled because transaction is not started", | |
4624 | (unsigned long long)off, (unsigned long long)len); | |
4625 | return -EIO; | |
4626 | } | |
4627 | /* | |
4628 | * Since we account only one data block in transaction credits, | |
4629 | * then it is impossible to cross a block boundary. | |
4630 | */ | |
4631 | if (sb->s_blocksize - offset < len) { | |
4632 | ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)" | |
4633 | " cancelled because not block aligned", | |
4634 | (unsigned long long)off, (unsigned long long)len); | |
4635 | return -EIO; | |
4636 | } | |
4637 | ||
4638 | mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA); | |
4639 | bh = ext4_bread(handle, inode, blk, 1, &err); | |
4640 | if (!bh) | |
4641 | goto out; | |
4642 | err = ext4_journal_get_write_access(handle, bh); | |
4643 | if (err) { | |
4644 | brelse(bh); | |
4645 | goto out; | |
4646 | } | |
4647 | lock_buffer(bh); | |
4648 | memcpy(bh->b_data+offset, data, len); | |
4649 | flush_dcache_page(bh->b_page); | |
4650 | unlock_buffer(bh); | |
4651 | err = ext4_handle_dirty_metadata(handle, NULL, bh); | |
4652 | brelse(bh); | |
4653 | out: | |
4654 | if (err) { | |
4655 | mutex_unlock(&inode->i_mutex); | |
4656 | return err; | |
4657 | } | |
4658 | if (inode->i_size < off + len) { | |
4659 | i_size_write(inode, off + len); | |
4660 | EXT4_I(inode)->i_disksize = inode->i_size; | |
4661 | } | |
4662 | inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
4663 | ext4_mark_inode_dirty(handle, inode); | |
4664 | mutex_unlock(&inode->i_mutex); | |
4665 | return len; | |
4666 | } | |
4667 | ||
4668 | #endif | |
4669 | ||
4670 | static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags, | |
4671 | const char *dev_name, void *data) | |
4672 | { | |
4673 | return mount_bdev(fs_type, flags, dev_name, data, ext4_fill_super); | |
4674 | } | |
4675 | ||
4676 | #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23) | |
4677 | static struct file_system_type ext2_fs_type = { | |
4678 | .owner = THIS_MODULE, | |
4679 | .name = "ext2", | |
4680 | .mount = ext4_mount, | |
4681 | .kill_sb = kill_block_super, | |
4682 | .fs_flags = FS_REQUIRES_DEV, | |
4683 | }; | |
4684 | ||
4685 | static inline void register_as_ext2(void) | |
4686 | { | |
4687 | int err = register_filesystem(&ext2_fs_type); | |
4688 | if (err) | |
4689 | printk(KERN_WARNING | |
4690 | "EXT4-fs: Unable to register as ext2 (%d)\n", err); | |
4691 | } | |
4692 | ||
4693 | static inline void unregister_as_ext2(void) | |
4694 | { | |
4695 | unregister_filesystem(&ext2_fs_type); | |
4696 | } | |
4697 | MODULE_ALIAS("ext2"); | |
4698 | #else | |
4699 | static inline void register_as_ext2(void) { } | |
4700 | static inline void unregister_as_ext2(void) { } | |
4701 | #endif | |
4702 | ||
4703 | #if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23) | |
4704 | static inline void register_as_ext3(void) | |
4705 | { | |
4706 | int err = register_filesystem(&ext3_fs_type); | |
4707 | if (err) | |
4708 | printk(KERN_WARNING | |
4709 | "EXT4-fs: Unable to register as ext3 (%d)\n", err); | |
4710 | } | |
4711 | ||
4712 | static inline void unregister_as_ext3(void) | |
4713 | { | |
4714 | unregister_filesystem(&ext3_fs_type); | |
4715 | } | |
4716 | MODULE_ALIAS("ext3"); | |
4717 | #else | |
4718 | static inline void register_as_ext3(void) { } | |
4719 | static inline void unregister_as_ext3(void) { } | |
4720 | #endif | |
4721 | ||
4722 | static struct file_system_type ext4_fs_type = { | |
4723 | .owner = THIS_MODULE, | |
4724 | .name = "ext4", | |
4725 | .mount = ext4_mount, | |
4726 | .kill_sb = kill_block_super, | |
4727 | .fs_flags = FS_REQUIRES_DEV, | |
4728 | }; | |
4729 | ||
4730 | int __init ext4_init_feat_adverts(void) | |
4731 | { | |
4732 | struct ext4_features *ef; | |
4733 | int ret = -ENOMEM; | |
4734 | ||
4735 | ef = kzalloc(sizeof(struct ext4_features), GFP_KERNEL); | |
4736 | if (!ef) | |
4737 | goto out; | |
4738 | ||
4739 | ef->f_kobj.kset = ext4_kset; | |
4740 | init_completion(&ef->f_kobj_unregister); | |
4741 | ret = kobject_init_and_add(&ef->f_kobj, &ext4_feat_ktype, NULL, | |
4742 | "features"); | |
4743 | if (ret) { | |
4744 | kfree(ef); | |
4745 | goto out; | |
4746 | } | |
4747 | ||
4748 | ext4_feat = ef; | |
4749 | ret = 0; | |
4750 | out: | |
4751 | return ret; | |
4752 | } | |
4753 | ||
4754 | static int __init ext4_init_fs(void) | |
4755 | { | |
4756 | int err; | |
4757 | ||
4758 | ext4_check_flag_values(); | |
4759 | err = ext4_init_pageio(); | |
4760 | if (err) | |
4761 | return err; | |
4762 | err = ext4_init_system_zone(); | |
4763 | if (err) | |
4764 | goto out5; | |
4765 | ext4_kset = kset_create_and_add("ext4", NULL, fs_kobj); | |
4766 | if (!ext4_kset) | |
4767 | goto out4; | |
4768 | ext4_proc_root = proc_mkdir("fs/ext4", NULL); | |
4769 | ||
4770 | err = ext4_init_feat_adverts(); | |
4771 | ||
4772 | err = ext4_init_mballoc(); | |
4773 | if (err) | |
4774 | goto out3; | |
4775 | ||
4776 | err = ext4_init_xattr(); | |
4777 | if (err) | |
4778 | goto out2; | |
4779 | err = init_inodecache(); | |
4780 | if (err) | |
4781 | goto out1; | |
4782 | register_as_ext2(); | |
4783 | register_as_ext3(); | |
4784 | err = register_filesystem(&ext4_fs_type); | |
4785 | if (err) | |
4786 | goto out; | |
4787 | ||
4788 | ext4_li_info = NULL; | |
4789 | mutex_init(&ext4_li_mtx); | |
4790 | return 0; | |
4791 | out: | |
4792 | unregister_as_ext2(); | |
4793 | unregister_as_ext3(); | |
4794 | destroy_inodecache(); | |
4795 | out1: | |
4796 | ext4_exit_xattr(); | |
4797 | out2: | |
4798 | ext4_exit_mballoc(); | |
4799 | out3: | |
4800 | kfree(ext4_feat); | |
4801 | remove_proc_entry("fs/ext4", NULL); | |
4802 | kset_unregister(ext4_kset); | |
4803 | out4: | |
4804 | ext4_exit_system_zone(); | |
4805 | out5: | |
4806 | ext4_exit_pageio(); | |
4807 | return err; | |
4808 | } | |
4809 | ||
4810 | static void __exit ext4_exit_fs(void) | |
4811 | { | |
4812 | ext4_destroy_lazyinit_thread(); | |
4813 | unregister_as_ext2(); | |
4814 | unregister_as_ext3(); | |
4815 | unregister_filesystem(&ext4_fs_type); | |
4816 | destroy_inodecache(); | |
4817 | ext4_exit_xattr(); | |
4818 | ext4_exit_mballoc(); | |
4819 | remove_proc_entry("fs/ext4", NULL); | |
4820 | kset_unregister(ext4_kset); | |
4821 | ext4_exit_system_zone(); | |
4822 | ext4_exit_pageio(); | |
4823 | } | |
4824 | ||
4825 | MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others"); | |
4826 | MODULE_DESCRIPTION("Fourth Extended Filesystem"); | |
4827 | MODULE_LICENSE("GPL"); | |
4828 | module_init(ext4_init_fs) | |
4829 | module_exit(ext4_exit_fs) |