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Merge tag 'fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/arm...
[linux-2.6.git] / fs / ext4 / super.c
blobc977f4e4e63be6c4cf3b477f628e4fc7d323d1f5
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 <linux/cleancache.h>
42 #include <asm/uaccess.h>
43
44 #include <linux/kthread.h>
45 #include <linux/freezer.h>
46
47 #include "ext4.h"
48 #include "ext4_extents.h" /* Needed for trace points definition */
49 #include "ext4_jbd2.h"
50 #include "xattr.h"
51 #include "acl.h"
52 #include "mballoc.h"
53
54 #define CREATE_TRACE_POINTS
55 #include <trace/events/ext4.h>
56
57 static struct proc_dir_entry *ext4_proc_root;
58 static struct kset *ext4_kset;
59 static struct ext4_lazy_init *ext4_li_info;
60 static struct mutex ext4_li_mtx;
61 static struct ext4_features *ext4_feat;
62
63 static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
64 unsigned long journal_devnum);
65 static int ext4_show_options(struct seq_file *seq, struct dentry *root);
66 static int ext4_commit_super(struct super_block *sb, int sync);
67 static void ext4_mark_recovery_complete(struct super_block *sb,
68 struct ext4_super_block *es);
69 static void ext4_clear_journal_err(struct super_block *sb,
70 struct ext4_super_block *es);
71 static int ext4_sync_fs(struct super_block *sb, int wait);
72 static int ext4_sync_fs_nojournal(struct super_block *sb, int wait);
73 static int ext4_remount(struct super_block *sb, int *flags, char *data);
74 static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
75 static int ext4_unfreeze(struct super_block *sb);
76 static int ext4_freeze(struct super_block *sb);
77 static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
78 const char *dev_name, void *data);
79 static inline int ext2_feature_set_ok(struct super_block *sb);
80 static inline int ext3_feature_set_ok(struct super_block *sb);
81 static int ext4_feature_set_ok(struct super_block *sb, int readonly);
82 static void ext4_destroy_lazyinit_thread(void);
83 static void ext4_unregister_li_request(struct super_block *sb);
84 static void ext4_clear_request_list(void);
85 static int ext4_reserve_clusters(struct ext4_sb_info *, ext4_fsblk_t);
86
87 #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
88 static struct file_system_type ext2_fs_type = {
89 .owner = THIS_MODULE,
90 .name = "ext2",
91 .mount = ext4_mount,
92 .kill_sb = kill_block_super,
93 .fs_flags = FS_REQUIRES_DEV,
94 };
95 MODULE_ALIAS_FS("ext2");
96 MODULE_ALIAS("ext2");
97 #define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type)
98 #else
99 #define IS_EXT2_SB(sb) (0)
100 #endif
101
102
103 #if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
104 static struct file_system_type ext3_fs_type = {
105 .owner = THIS_MODULE,
106 .name = "ext3",
107 .mount = ext4_mount,
108 .kill_sb = kill_block_super,
109 .fs_flags = FS_REQUIRES_DEV,
110 };
111 MODULE_ALIAS_FS("ext3");
112 MODULE_ALIAS("ext3");
113 #define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type)
114 #else
115 #define IS_EXT3_SB(sb) (0)
116 #endif
117
118 static int ext4_verify_csum_type(struct super_block *sb,
119 struct ext4_super_block *es)
120 {
121 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
122 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
123 return 1;
124
125 return es->s_checksum_type == EXT4_CRC32C_CHKSUM;
126 }
127
128 static __le32 ext4_superblock_csum(struct super_block *sb,
129 struct ext4_super_block *es)
130 {
131 struct ext4_sb_info *sbi = EXT4_SB(sb);
132 int offset = offsetof(struct ext4_super_block, s_checksum);
133 __u32 csum;
134
135 csum = ext4_chksum(sbi, ~0, (char *)es, offset);
136
137 return cpu_to_le32(csum);
138 }
139
140 int ext4_superblock_csum_verify(struct super_block *sb,
141 struct ext4_super_block *es)
142 {
143 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
144 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
145 return 1;
146
147 return es->s_checksum == ext4_superblock_csum(sb, es);
148 }
149
150 void ext4_superblock_csum_set(struct super_block *sb)
151 {
152 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
153
154 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
155 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
156 return;
157
158 es->s_checksum = ext4_superblock_csum(sb, es);
159 }
160
161 void *ext4_kvmalloc(size_t size, gfp_t flags)
162 {
163 void *ret;
164
165 ret = kmalloc(size, flags | __GFP_NOWARN);
166 if (!ret)
167 ret = __vmalloc(size, flags, PAGE_KERNEL);
168 return ret;
169 }
170
171 void *ext4_kvzalloc(size_t size, gfp_t flags)
172 {
173 void *ret;
174
175 ret = kzalloc(size, flags | __GFP_NOWARN);
176 if (!ret)
177 ret = __vmalloc(size, flags | __GFP_ZERO, PAGE_KERNEL);
178 return ret;
179 }
180
181 void ext4_kvfree(void *ptr)
182 {
183 if (is_vmalloc_addr(ptr))
184 vfree(ptr);
185 else
186 kfree(ptr);
187
188 }
189
190 ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
191 struct ext4_group_desc *bg)
192 {
193 return le32_to_cpu(bg->bg_block_bitmap_lo) |
194 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
195 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
196 }
197
198 ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
199 struct ext4_group_desc *bg)
200 {
201 return le32_to_cpu(bg->bg_inode_bitmap_lo) |
202 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
203 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
204 }
205
206 ext4_fsblk_t ext4_inode_table(struct super_block *sb,
207 struct ext4_group_desc *bg)
208 {
209 return le32_to_cpu(bg->bg_inode_table_lo) |
210 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
211 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
212 }
213
214 __u32 ext4_free_group_clusters(struct super_block *sb,
215 struct ext4_group_desc *bg)
216 {
217 return le16_to_cpu(bg->bg_free_blocks_count_lo) |
218 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
219 (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0);
220 }
221
222 __u32 ext4_free_inodes_count(struct super_block *sb,
223 struct ext4_group_desc *bg)
224 {
225 return le16_to_cpu(bg->bg_free_inodes_count_lo) |
226 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
227 (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0);
228 }
229
230 __u32 ext4_used_dirs_count(struct super_block *sb,
231 struct ext4_group_desc *bg)
232 {
233 return le16_to_cpu(bg->bg_used_dirs_count_lo) |
234 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
235 (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0);
236 }
237
238 __u32 ext4_itable_unused_count(struct super_block *sb,
239 struct ext4_group_desc *bg)
240 {
241 return le16_to_cpu(bg->bg_itable_unused_lo) |
242 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
243 (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0);
244 }
245
246 void ext4_block_bitmap_set(struct super_block *sb,
247 struct ext4_group_desc *bg, ext4_fsblk_t blk)
248 {
249 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
250 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
251 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
252 }
253
254 void ext4_inode_bitmap_set(struct super_block *sb,
255 struct ext4_group_desc *bg, ext4_fsblk_t blk)
256 {
257 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk);
258 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
259 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
260 }
261
262 void ext4_inode_table_set(struct super_block *sb,
263 struct ext4_group_desc *bg, ext4_fsblk_t blk)
264 {
265 bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
266 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
267 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
268 }
269
270 void ext4_free_group_clusters_set(struct super_block *sb,
271 struct ext4_group_desc *bg, __u32 count)
272 {
273 bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count);
274 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
275 bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16);
276 }
277
278 void ext4_free_inodes_set(struct super_block *sb,
279 struct ext4_group_desc *bg, __u32 count)
280 {
281 bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count);
282 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
283 bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16);
284 }
285
286 void ext4_used_dirs_set(struct super_block *sb,
287 struct ext4_group_desc *bg, __u32 count)
288 {
289 bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count);
290 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
291 bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16);
292 }
293
294 void ext4_itable_unused_set(struct super_block *sb,
295 struct ext4_group_desc *bg, __u32 count)
296 {
297 bg->bg_itable_unused_lo = cpu_to_le16((__u16)count);
298 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
299 bg->bg_itable_unused_hi = cpu_to_le16(count >> 16);
300 }
301
302
303 static void __save_error_info(struct super_block *sb, const char *func,
304 unsigned int line)
305 {
306 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
307
308 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
309 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
310 es->s_last_error_time = cpu_to_le32(get_seconds());
311 strncpy(es->s_last_error_func, func, sizeof(es->s_last_error_func));
312 es->s_last_error_line = cpu_to_le32(line);
313 if (!es->s_first_error_time) {
314 es->s_first_error_time = es->s_last_error_time;
315 strncpy(es->s_first_error_func, func,
316 sizeof(es->s_first_error_func));
317 es->s_first_error_line = cpu_to_le32(line);
318 es->s_first_error_ino = es->s_last_error_ino;
319 es->s_first_error_block = es->s_last_error_block;
320 }
321 /*
322 * Start the daily error reporting function if it hasn't been
323 * started already
324 */
325 if (!es->s_error_count)
326 mod_timer(&EXT4_SB(sb)->s_err_report, jiffies + 24*60*60*HZ);
327 le32_add_cpu(&es->s_error_count, 1);
328 }
329
330 static void save_error_info(struct super_block *sb, const char *func,
331 unsigned int line)
332 {
333 __save_error_info(sb, func, line);
334 ext4_commit_super(sb, 1);
335 }
336
337 /*
338 * The del_gendisk() function uninitializes the disk-specific data
339 * structures, including the bdi structure, without telling anyone
340 * else. Once this happens, any attempt to call mark_buffer_dirty()
341 * (for example, by ext4_commit_super), will cause a kernel OOPS.
342 * This is a kludge to prevent these oops until we can put in a proper
343 * hook in del_gendisk() to inform the VFS and file system layers.
344 */
345 static int block_device_ejected(struct super_block *sb)
346 {
347 struct inode *bd_inode = sb->s_bdev->bd_inode;
348 struct backing_dev_info *bdi = bd_inode->i_mapping->backing_dev_info;
349
350 return bdi->dev == NULL;
351 }
352
353 static void ext4_journal_commit_callback(journal_t *journal, transaction_t *txn)
354 {
355 struct super_block *sb = journal->j_private;
356 struct ext4_sb_info *sbi = EXT4_SB(sb);
357 int error = is_journal_aborted(journal);
358 struct ext4_journal_cb_entry *jce;
359
360 BUG_ON(txn->t_state == T_FINISHED);
361 spin_lock(&sbi->s_md_lock);
362 while (!list_empty(&txn->t_private_list)) {
363 jce = list_entry(txn->t_private_list.next,
364 struct ext4_journal_cb_entry, jce_list);
365 list_del_init(&jce->jce_list);
366 spin_unlock(&sbi->s_md_lock);
367 jce->jce_func(sb, jce, error);
368 spin_lock(&sbi->s_md_lock);
369 }
370 spin_unlock(&sbi->s_md_lock);
371 }
372
373 /* Deal with the reporting of failure conditions on a filesystem such as
374 * inconsistencies detected or read IO failures.
375 *
376 * On ext2, we can store the error state of the filesystem in the
377 * superblock. That is not possible on ext4, because we may have other
378 * write ordering constraints on the superblock which prevent us from
379 * writing it out straight away; and given that the journal is about to
380 * be aborted, we can't rely on the current, or future, transactions to
381 * write out the superblock safely.
382 *
383 * We'll just use the jbd2_journal_abort() error code to record an error in
384 * the journal instead. On recovery, the journal will complain about
385 * that error until we've noted it down and cleared it.
386 */
387
388 static void ext4_handle_error(struct super_block *sb)
389 {
390 if (sb->s_flags & MS_RDONLY)
391 return;
392
393 if (!test_opt(sb, ERRORS_CONT)) {
394 journal_t *journal = EXT4_SB(sb)->s_journal;
395
396 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
397 if (journal)
398 jbd2_journal_abort(journal, -EIO);
399 }
400 if (test_opt(sb, ERRORS_RO)) {
401 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
402 /*
403 * Make sure updated value of ->s_mount_flags will be visible
404 * before ->s_flags update
405 */
406 smp_wmb();
407 sb->s_flags |= MS_RDONLY;
408 }
409 if (test_opt(sb, ERRORS_PANIC))
410 panic("EXT4-fs (device %s): panic forced after error\n",
411 sb->s_id);
412 }
413
414 #define ext4_error_ratelimit(sb) \
415 ___ratelimit(&(EXT4_SB(sb)->s_err_ratelimit_state), \
416 "EXT4-fs error")
417
418 void __ext4_error(struct super_block *sb, const char *function,
419 unsigned int line, const char *fmt, ...)
420 {
421 struct va_format vaf;
422 va_list args;
423
424 if (ext4_error_ratelimit(sb)) {
425 va_start(args, fmt);
426 vaf.fmt = fmt;
427 vaf.va = &args;
428 printk(KERN_CRIT
429 "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n",
430 sb->s_id, function, line, current->comm, &vaf);
431 va_end(args);
432 }
433 save_error_info(sb, function, line);
434 ext4_handle_error(sb);
435 }
436
437 void __ext4_error_inode(struct inode *inode, const char *function,
438 unsigned int line, ext4_fsblk_t block,
439 const char *fmt, ...)
440 {
441 va_list args;
442 struct va_format vaf;
443 struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
444
445 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
446 es->s_last_error_block = cpu_to_le64(block);
447 if (ext4_error_ratelimit(inode->i_sb)) {
448 va_start(args, fmt);
449 vaf.fmt = fmt;
450 vaf.va = &args;
451 if (block)
452 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
453 "inode #%lu: block %llu: comm %s: %pV\n",
454 inode->i_sb->s_id, function, line, inode->i_ino,
455 block, current->comm, &vaf);
456 else
457 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
458 "inode #%lu: comm %s: %pV\n",
459 inode->i_sb->s_id, function, line, inode->i_ino,
460 current->comm, &vaf);
461 va_end(args);
462 }
463 save_error_info(inode->i_sb, function, line);
464 ext4_handle_error(inode->i_sb);
465 }
466
467 void __ext4_error_file(struct file *file, const char *function,
468 unsigned int line, ext4_fsblk_t block,
469 const char *fmt, ...)
470 {
471 va_list args;
472 struct va_format vaf;
473 struct ext4_super_block *es;
474 struct inode *inode = file_inode(file);
475 char pathname[80], *path;
476
477 es = EXT4_SB(inode->i_sb)->s_es;
478 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
479 if (ext4_error_ratelimit(inode->i_sb)) {
480 path = d_path(&(file->f_path), pathname, sizeof(pathname));
481 if (IS_ERR(path))
482 path = "(unknown)";
483 va_start(args, fmt);
484 vaf.fmt = fmt;
485 vaf.va = &args;
486 if (block)
487 printk(KERN_CRIT
488 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
489 "block %llu: comm %s: path %s: %pV\n",
490 inode->i_sb->s_id, function, line, inode->i_ino,
491 block, current->comm, path, &vaf);
492 else
493 printk(KERN_CRIT
494 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
495 "comm %s: path %s: %pV\n",
496 inode->i_sb->s_id, function, line, inode->i_ino,
497 current->comm, path, &vaf);
498 va_end(args);
499 }
500 save_error_info(inode->i_sb, function, line);
501 ext4_handle_error(inode->i_sb);
502 }
503
504 const char *ext4_decode_error(struct super_block *sb, int errno,
505 char nbuf[16])
506 {
507 char *errstr = NULL;
508
509 switch (errno) {
510 case -EIO:
511 errstr = "IO failure";
512 break;
513 case -ENOMEM:
514 errstr = "Out of memory";
515 break;
516 case -EROFS:
517 if (!sb || (EXT4_SB(sb)->s_journal &&
518 EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT))
519 errstr = "Journal has aborted";
520 else
521 errstr = "Readonly filesystem";
522 break;
523 default:
524 /* If the caller passed in an extra buffer for unknown
525 * errors, textualise them now. Else we just return
526 * NULL. */
527 if (nbuf) {
528 /* Check for truncated error codes... */
529 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
530 errstr = nbuf;
531 }
532 break;
533 }
534
535 return errstr;
536 }
537
538 /* __ext4_std_error decodes expected errors from journaling functions
539 * automatically and invokes the appropriate error response. */
540
541 void __ext4_std_error(struct super_block *sb, const char *function,
542 unsigned int line, int errno)
543 {
544 char nbuf[16];
545 const char *errstr;
546
547 /* Special case: if the error is EROFS, and we're not already
548 * inside a transaction, then there's really no point in logging
549 * an error. */
550 if (errno == -EROFS && journal_current_handle() == NULL &&
551 (sb->s_flags & MS_RDONLY))
552 return;
553
554 if (ext4_error_ratelimit(sb)) {
555 errstr = ext4_decode_error(sb, errno, nbuf);
556 printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n",
557 sb->s_id, function, line, errstr);
558 }
559
560 save_error_info(sb, function, line);
561 ext4_handle_error(sb);
562 }
563
564 /*
565 * ext4_abort is a much stronger failure handler than ext4_error. The
566 * abort function may be used to deal with unrecoverable failures such
567 * as journal IO errors or ENOMEM at a critical moment in log management.
568 *
569 * We unconditionally force the filesystem into an ABORT|READONLY state,
570 * unless the error response on the fs has been set to panic in which
571 * case we take the easy way out and panic immediately.
572 */
573
574 void __ext4_abort(struct super_block *sb, const char *function,
575 unsigned int line, const char *fmt, ...)
576 {
577 va_list args;
578
579 save_error_info(sb, function, line);
580 va_start(args, fmt);
581 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: ", sb->s_id,
582 function, line);
583 vprintk(fmt, args);
584 printk("\n");
585 va_end(args);
586
587 if ((sb->s_flags & MS_RDONLY) == 0) {
588 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
589 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
590 /*
591 * Make sure updated value of ->s_mount_flags will be visible
592 * before ->s_flags update
593 */
594 smp_wmb();
595 sb->s_flags |= MS_RDONLY;
596 if (EXT4_SB(sb)->s_journal)
597 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
598 save_error_info(sb, function, line);
599 }
600 if (test_opt(sb, ERRORS_PANIC))
601 panic("EXT4-fs panic from previous error\n");
602 }
603
604 void __ext4_msg(struct super_block *sb,
605 const char *prefix, const char *fmt, ...)
606 {
607 struct va_format vaf;
608 va_list args;
609
610 if (!___ratelimit(&(EXT4_SB(sb)->s_msg_ratelimit_state), "EXT4-fs"))
611 return;
612
613 va_start(args, fmt);
614 vaf.fmt = fmt;
615 vaf.va = &args;
616 printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
617 va_end(args);
618 }
619
620 void __ext4_warning(struct super_block *sb, const char *function,
621 unsigned int line, const char *fmt, ...)
622 {
623 struct va_format vaf;
624 va_list args;
625
626 if (!___ratelimit(&(EXT4_SB(sb)->s_warning_ratelimit_state),
627 "EXT4-fs warning"))
628 return;
629
630 va_start(args, fmt);
631 vaf.fmt = fmt;
632 vaf.va = &args;
633 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: %pV\n",
634 sb->s_id, function, line, &vaf);
635 va_end(args);
636 }
637
638 void __ext4_grp_locked_error(const char *function, unsigned int line,
639 struct super_block *sb, ext4_group_t grp,
640 unsigned long ino, ext4_fsblk_t block,
641 const char *fmt, ...)
642 __releases(bitlock)
643 __acquires(bitlock)
644 {
645 struct va_format vaf;
646 va_list args;
647 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
648
649 es->s_last_error_ino = cpu_to_le32(ino);
650 es->s_last_error_block = cpu_to_le64(block);
651 __save_error_info(sb, function, line);
652
653 if (ext4_error_ratelimit(sb)) {
654 va_start(args, fmt);
655 vaf.fmt = fmt;
656 vaf.va = &args;
657 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u, ",
658 sb->s_id, function, line, grp);
659 if (ino)
660 printk(KERN_CONT "inode %lu: ", ino);
661 if (block)
662 printk(KERN_CONT "block %llu:",
663 (unsigned long long) block);
664 printk(KERN_CONT "%pV\n", &vaf);
665 va_end(args);
666 }
667
668 if (test_opt(sb, ERRORS_CONT)) {
669 ext4_commit_super(sb, 0);
670 return;
671 }
672
673 ext4_unlock_group(sb, grp);
674 ext4_handle_error(sb);
675 /*
676 * We only get here in the ERRORS_RO case; relocking the group
677 * may be dangerous, but nothing bad will happen since the
678 * filesystem will have already been marked read/only and the
679 * journal has been aborted. We return 1 as a hint to callers
680 * who might what to use the return value from
681 * ext4_grp_locked_error() to distinguish between the
682 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
683 * aggressively from the ext4 function in question, with a
684 * more appropriate error code.
685 */
686 ext4_lock_group(sb, grp);
687 return;
688 }
689
690 void ext4_update_dynamic_rev(struct super_block *sb)
691 {
692 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
693
694 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
695 return;
696
697 ext4_warning(sb,
698 "updating to rev %d because of new feature flag, "
699 "running e2fsck is recommended",
700 EXT4_DYNAMIC_REV);
701
702 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
703 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
704 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
705 /* leave es->s_feature_*compat flags alone */
706 /* es->s_uuid will be set by e2fsck if empty */
707
708 /*
709 * The rest of the superblock fields should be zero, and if not it
710 * means they are likely already in use, so leave them alone. We
711 * can leave it up to e2fsck to clean up any inconsistencies there.
712 */
713 }
714
715 /*
716 * Open the external journal device
717 */
718 static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb)
719 {
720 struct block_device *bdev;
721 char b[BDEVNAME_SIZE];
722
723 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
724 if (IS_ERR(bdev))
725 goto fail;
726 return bdev;
727
728 fail:
729 ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld",
730 __bdevname(dev, b), PTR_ERR(bdev));
731 return NULL;
732 }
733
734 /*
735 * Release the journal device
736 */
737 static void ext4_blkdev_put(struct block_device *bdev)
738 {
739 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
740 }
741
742 static void ext4_blkdev_remove(struct ext4_sb_info *sbi)
743 {
744 struct block_device *bdev;
745 bdev = sbi->journal_bdev;
746 if (bdev) {
747 ext4_blkdev_put(bdev);
748 sbi->journal_bdev = NULL;
749 }
750 }
751
752 static inline struct inode *orphan_list_entry(struct list_head *l)
753 {
754 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
755 }
756
757 static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
758 {
759 struct list_head *l;
760
761 ext4_msg(sb, KERN_ERR, "sb orphan head is %d",
762 le32_to_cpu(sbi->s_es->s_last_orphan));
763
764 printk(KERN_ERR "sb_info orphan list:\n");
765 list_for_each(l, &sbi->s_orphan) {
766 struct inode *inode = orphan_list_entry(l);
767 printk(KERN_ERR " "
768 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
769 inode->i_sb->s_id, inode->i_ino, inode,
770 inode->i_mode, inode->i_nlink,
771 NEXT_ORPHAN(inode));
772 }
773 }
774
775 static void ext4_put_super(struct super_block *sb)
776 {
777 struct ext4_sb_info *sbi = EXT4_SB(sb);
778 struct ext4_super_block *es = sbi->s_es;
779 int i, err;
780
781 ext4_unregister_li_request(sb);
782 dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
783
784 flush_workqueue(sbi->rsv_conversion_wq);
785 destroy_workqueue(sbi->rsv_conversion_wq);
786
787 if (sbi->s_journal) {
788 err = jbd2_journal_destroy(sbi->s_journal);
789 sbi->s_journal = NULL;
790 if (err < 0)
791 ext4_abort(sb, "Couldn't clean up the journal");
792 }
793
794 ext4_es_unregister_shrinker(sbi);
795 del_timer(&sbi->s_err_report);
796 ext4_release_system_zone(sb);
797 ext4_mb_release(sb);
798 ext4_ext_release(sb);
799 ext4_xattr_put_super(sb);
800
801 if (!(sb->s_flags & MS_RDONLY)) {
802 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
803 es->s_state = cpu_to_le16(sbi->s_mount_state);
804 }
805 if (!(sb->s_flags & MS_RDONLY))
806 ext4_commit_super(sb, 1);
807
808 if (sbi->s_proc) {
809 remove_proc_entry("options", sbi->s_proc);
810 remove_proc_entry(sb->s_id, ext4_proc_root);
811 }
812 kobject_del(&sbi->s_kobj);
813
814 for (i = 0; i < sbi->s_gdb_count; i++)
815 brelse(sbi->s_group_desc[i]);
816 ext4_kvfree(sbi->s_group_desc);
817 ext4_kvfree(sbi->s_flex_groups);
818 percpu_counter_destroy(&sbi->s_freeclusters_counter);
819 percpu_counter_destroy(&sbi->s_freeinodes_counter);
820 percpu_counter_destroy(&sbi->s_dirs_counter);
821 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
822 percpu_counter_destroy(&sbi->s_extent_cache_cnt);
823 brelse(sbi->s_sbh);
824 #ifdef CONFIG_QUOTA
825 for (i = 0; i < MAXQUOTAS; i++)
826 kfree(sbi->s_qf_names[i]);
827 #endif
828
829 /* Debugging code just in case the in-memory inode orphan list
830 * isn't empty. The on-disk one can be non-empty if we've
831 * detected an error and taken the fs readonly, but the
832 * in-memory list had better be clean by this point. */
833 if (!list_empty(&sbi->s_orphan))
834 dump_orphan_list(sb, sbi);
835 J_ASSERT(list_empty(&sbi->s_orphan));
836
837 invalidate_bdev(sb->s_bdev);
838 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
839 /*
840 * Invalidate the journal device's buffers. We don't want them
841 * floating about in memory - the physical journal device may
842 * hotswapped, and it breaks the `ro-after' testing code.
843 */
844 sync_blockdev(sbi->journal_bdev);
845 invalidate_bdev(sbi->journal_bdev);
846 ext4_blkdev_remove(sbi);
847 }
848 if (sbi->s_mmp_tsk)
849 kthread_stop(sbi->s_mmp_tsk);
850 sb->s_fs_info = NULL;
851 /*
852 * Now that we are completely done shutting down the
853 * superblock, we need to actually destroy the kobject.
854 */
855 kobject_put(&sbi->s_kobj);
856 wait_for_completion(&sbi->s_kobj_unregister);
857 if (sbi->s_chksum_driver)
858 crypto_free_shash(sbi->s_chksum_driver);
859 kfree(sbi->s_blockgroup_lock);
860 kfree(sbi);
861 }
862
863 static struct kmem_cache *ext4_inode_cachep;
864
865 /*
866 * Called inside transaction, so use GFP_NOFS
867 */
868 static struct inode *ext4_alloc_inode(struct super_block *sb)
869 {
870 struct ext4_inode_info *ei;
871
872 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
873 if (!ei)
874 return NULL;
875
876 ei->vfs_inode.i_version = 1;
877 INIT_LIST_HEAD(&ei->i_prealloc_list);
878 spin_lock_init(&ei->i_prealloc_lock);
879 ext4_es_init_tree(&ei->i_es_tree);
880 rwlock_init(&ei->i_es_lock);
881 INIT_LIST_HEAD(&ei->i_es_lru);
882 ei->i_es_lru_nr = 0;
883 ei->i_touch_when = 0;
884 ei->i_reserved_data_blocks = 0;
885 ei->i_reserved_meta_blocks = 0;
886 ei->i_allocated_meta_blocks = 0;
887 ei->i_da_metadata_calc_len = 0;
888 ei->i_da_metadata_calc_last_lblock = 0;
889 spin_lock_init(&(ei->i_block_reservation_lock));
890 #ifdef CONFIG_QUOTA
891 ei->i_reserved_quota = 0;
892 #endif
893 ei->jinode = NULL;
894 INIT_LIST_HEAD(&ei->i_rsv_conversion_list);
895 spin_lock_init(&ei->i_completed_io_lock);
896 ei->i_sync_tid = 0;
897 ei->i_datasync_tid = 0;
898 atomic_set(&ei->i_ioend_count, 0);
899 atomic_set(&ei->i_unwritten, 0);
900 INIT_WORK(&ei->i_rsv_conversion_work, ext4_end_io_rsv_work);
901
902 return &ei->vfs_inode;
903 }
904
905 static int ext4_drop_inode(struct inode *inode)
906 {
907 int drop = generic_drop_inode(inode);
908
909 trace_ext4_drop_inode(inode, drop);
910 return drop;
911 }
912
913 static void ext4_i_callback(struct rcu_head *head)
914 {
915 struct inode *inode = container_of(head, struct inode, i_rcu);
916 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
917 }
918
919 static void ext4_destroy_inode(struct inode *inode)
920 {
921 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
922 ext4_msg(inode->i_sb, KERN_ERR,
923 "Inode %lu (%p): orphan list check failed!",
924 inode->i_ino, EXT4_I(inode));
925 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
926 EXT4_I(inode), sizeof(struct ext4_inode_info),
927 true);
928 dump_stack();
929 }
930 call_rcu(&inode->i_rcu, ext4_i_callback);
931 }
932
933 static void init_once(void *foo)
934 {
935 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
936
937 INIT_LIST_HEAD(&ei->i_orphan);
938 init_rwsem(&ei->xattr_sem);
939 init_rwsem(&ei->i_data_sem);
940 inode_init_once(&ei->vfs_inode);
941 }
942
943 static int init_inodecache(void)
944 {
945 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
946 sizeof(struct ext4_inode_info),
947 0, (SLAB_RECLAIM_ACCOUNT|
948 SLAB_MEM_SPREAD),
949 init_once);
950 if (ext4_inode_cachep == NULL)
951 return -ENOMEM;
952 return 0;
953 }
954
955 static void destroy_inodecache(void)
956 {
957 /*
958 * Make sure all delayed rcu free inodes are flushed before we
959 * destroy cache.
960 */
961 rcu_barrier();
962 kmem_cache_destroy(ext4_inode_cachep);
963 }
964
965 void ext4_clear_inode(struct inode *inode)
966 {
967 invalidate_inode_buffers(inode);
968 clear_inode(inode);
969 dquot_drop(inode);
970 ext4_discard_preallocations(inode);
971 ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS);
972 ext4_es_lru_del(inode);
973 if (EXT4_I(inode)->jinode) {
974 jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode),
975 EXT4_I(inode)->jinode);
976 jbd2_free_inode(EXT4_I(inode)->jinode);
977 EXT4_I(inode)->jinode = NULL;
978 }
979 }
980
981 static struct inode *ext4_nfs_get_inode(struct super_block *sb,
982 u64 ino, u32 generation)
983 {
984 struct inode *inode;
985
986 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
987 return ERR_PTR(-ESTALE);
988 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
989 return ERR_PTR(-ESTALE);
990
991 /* iget isn't really right if the inode is currently unallocated!!
992 *
993 * ext4_read_inode will return a bad_inode if the inode had been
994 * deleted, so we should be safe.
995 *
996 * Currently we don't know the generation for parent directory, so
997 * a generation of 0 means "accept any"
998 */
999 inode = ext4_iget(sb, ino);
1000 if (IS_ERR(inode))
1001 return ERR_CAST(inode);
1002 if (generation && inode->i_generation != generation) {
1003 iput(inode);
1004 return ERR_PTR(-ESTALE);
1005 }
1006
1007 return inode;
1008 }
1009
1010 static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
1011 int fh_len, int fh_type)
1012 {
1013 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
1014 ext4_nfs_get_inode);
1015 }
1016
1017 static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
1018 int fh_len, int fh_type)
1019 {
1020 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
1021 ext4_nfs_get_inode);
1022 }
1023
1024 /*
1025 * Try to release metadata pages (indirect blocks, directories) which are
1026 * mapped via the block device. Since these pages could have journal heads
1027 * which would prevent try_to_free_buffers() from freeing them, we must use
1028 * jbd2 layer's try_to_free_buffers() function to release them.
1029 */
1030 static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
1031 gfp_t wait)
1032 {
1033 journal_t *journal = EXT4_SB(sb)->s_journal;
1034
1035 WARN_ON(PageChecked(page));
1036 if (!page_has_buffers(page))
1037 return 0;
1038 if (journal)
1039 return jbd2_journal_try_to_free_buffers(journal, page,
1040 wait & ~__GFP_WAIT);
1041 return try_to_free_buffers(page);
1042 }
1043
1044 #ifdef CONFIG_QUOTA
1045 #define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
1046 #define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
1047
1048 static int ext4_write_dquot(struct dquot *dquot);
1049 static int ext4_acquire_dquot(struct dquot *dquot);
1050 static int ext4_release_dquot(struct dquot *dquot);
1051 static int ext4_mark_dquot_dirty(struct dquot *dquot);
1052 static int ext4_write_info(struct super_block *sb, int type);
1053 static int ext4_quota_on(struct super_block *sb, int type, int format_id,
1054 struct path *path);
1055 static int ext4_quota_on_sysfile(struct super_block *sb, int type,
1056 int format_id);
1057 static int ext4_quota_off(struct super_block *sb, int type);
1058 static int ext4_quota_off_sysfile(struct super_block *sb, int type);
1059 static int ext4_quota_on_mount(struct super_block *sb, int type);
1060 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
1061 size_t len, loff_t off);
1062 static ssize_t ext4_quota_write(struct super_block *sb, int type,
1063 const char *data, size_t len, loff_t off);
1064 static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
1065 unsigned int flags);
1066 static int ext4_enable_quotas(struct super_block *sb);
1067
1068 static const struct dquot_operations ext4_quota_operations = {
1069 .get_reserved_space = ext4_get_reserved_space,
1070 .write_dquot = ext4_write_dquot,
1071 .acquire_dquot = ext4_acquire_dquot,
1072 .release_dquot = ext4_release_dquot,
1073 .mark_dirty = ext4_mark_dquot_dirty,
1074 .write_info = ext4_write_info,
1075 .alloc_dquot = dquot_alloc,
1076 .destroy_dquot = dquot_destroy,
1077 };
1078
1079 static const struct quotactl_ops ext4_qctl_operations = {
1080 .quota_on = ext4_quota_on,
1081 .quota_off = ext4_quota_off,
1082 .quota_sync = dquot_quota_sync,
1083 .get_info = dquot_get_dqinfo,
1084 .set_info = dquot_set_dqinfo,
1085 .get_dqblk = dquot_get_dqblk,
1086 .set_dqblk = dquot_set_dqblk
1087 };
1088
1089 static const struct quotactl_ops ext4_qctl_sysfile_operations = {
1090 .quota_on_meta = ext4_quota_on_sysfile,
1091 .quota_off = ext4_quota_off_sysfile,
1092 .quota_sync = dquot_quota_sync,
1093 .get_info = dquot_get_dqinfo,
1094 .set_info = dquot_set_dqinfo,
1095 .get_dqblk = dquot_get_dqblk,
1096 .set_dqblk = dquot_set_dqblk
1097 };
1098 #endif
1099
1100 static const struct super_operations ext4_sops = {
1101 .alloc_inode = ext4_alloc_inode,
1102 .destroy_inode = ext4_destroy_inode,
1103 .write_inode = ext4_write_inode,
1104 .dirty_inode = ext4_dirty_inode,
1105 .drop_inode = ext4_drop_inode,
1106 .evict_inode = ext4_evict_inode,
1107 .put_super = ext4_put_super,
1108 .sync_fs = ext4_sync_fs,
1109 .freeze_fs = ext4_freeze,
1110 .unfreeze_fs = ext4_unfreeze,
1111 .statfs = ext4_statfs,
1112 .remount_fs = ext4_remount,
1113 .show_options = ext4_show_options,
1114 #ifdef CONFIG_QUOTA
1115 .quota_read = ext4_quota_read,
1116 .quota_write = ext4_quota_write,
1117 #endif
1118 .bdev_try_to_free_page = bdev_try_to_free_page,
1119 };
1120
1121 static const struct super_operations ext4_nojournal_sops = {
1122 .alloc_inode = ext4_alloc_inode,
1123 .destroy_inode = ext4_destroy_inode,
1124 .write_inode = ext4_write_inode,
1125 .dirty_inode = ext4_dirty_inode,
1126 .drop_inode = ext4_drop_inode,
1127 .evict_inode = ext4_evict_inode,
1128 .sync_fs = ext4_sync_fs_nojournal,
1129 .put_super = ext4_put_super,
1130 .statfs = ext4_statfs,
1131 .remount_fs = ext4_remount,
1132 .show_options = ext4_show_options,
1133 #ifdef CONFIG_QUOTA
1134 .quota_read = ext4_quota_read,
1135 .quota_write = ext4_quota_write,
1136 #endif
1137 .bdev_try_to_free_page = bdev_try_to_free_page,
1138 };
1139
1140 static const struct export_operations ext4_export_ops = {
1141 .fh_to_dentry = ext4_fh_to_dentry,
1142 .fh_to_parent = ext4_fh_to_parent,
1143 .get_parent = ext4_get_parent,
1144 };
1145
1146 enum {
1147 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
1148 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
1149 Opt_nouid32, Opt_debug, Opt_removed,
1150 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
1151 Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload,
1152 Opt_commit, Opt_min_batch_time, Opt_max_batch_time, Opt_journal_dev,
1153 Opt_journal_path, Opt_journal_checksum, Opt_journal_async_commit,
1154 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
1155 Opt_data_err_abort, Opt_data_err_ignore,
1156 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
1157 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
1158 Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err,
1159 Opt_usrquota, Opt_grpquota, Opt_i_version,
1160 Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_mblk_io_submit,
1161 Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity,
1162 Opt_inode_readahead_blks, Opt_journal_ioprio,
1163 Opt_dioread_nolock, Opt_dioread_lock,
1164 Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable,
1165 Opt_max_dir_size_kb,
1166 };
1167
1168 static const match_table_t tokens = {
1169 {Opt_bsd_df, "bsddf"},
1170 {Opt_minix_df, "minixdf"},
1171 {Opt_grpid, "grpid"},
1172 {Opt_grpid, "bsdgroups"},
1173 {Opt_nogrpid, "nogrpid"},
1174 {Opt_nogrpid, "sysvgroups"},
1175 {Opt_resgid, "resgid=%u"},
1176 {Opt_resuid, "resuid=%u"},
1177 {Opt_sb, "sb=%u"},
1178 {Opt_err_cont, "errors=continue"},
1179 {Opt_err_panic, "errors=panic"},
1180 {Opt_err_ro, "errors=remount-ro"},
1181 {Opt_nouid32, "nouid32"},
1182 {Opt_debug, "debug"},
1183 {Opt_removed, "oldalloc"},
1184 {Opt_removed, "orlov"},
1185 {Opt_user_xattr, "user_xattr"},
1186 {Opt_nouser_xattr, "nouser_xattr"},
1187 {Opt_acl, "acl"},
1188 {Opt_noacl, "noacl"},
1189 {Opt_noload, "norecovery"},
1190 {Opt_noload, "noload"},
1191 {Opt_removed, "nobh"},
1192 {Opt_removed, "bh"},
1193 {Opt_commit, "commit=%u"},
1194 {Opt_min_batch_time, "min_batch_time=%u"},
1195 {Opt_max_batch_time, "max_batch_time=%u"},
1196 {Opt_journal_dev, "journal_dev=%u"},
1197 {Opt_journal_path, "journal_path=%s"},
1198 {Opt_journal_checksum, "journal_checksum"},
1199 {Opt_journal_async_commit, "journal_async_commit"},
1200 {Opt_abort, "abort"},
1201 {Opt_data_journal, "data=journal"},
1202 {Opt_data_ordered, "data=ordered"},
1203 {Opt_data_writeback, "data=writeback"},
1204 {Opt_data_err_abort, "data_err=abort"},
1205 {Opt_data_err_ignore, "data_err=ignore"},
1206 {Opt_offusrjquota, "usrjquota="},
1207 {Opt_usrjquota, "usrjquota=%s"},
1208 {Opt_offgrpjquota, "grpjquota="},
1209 {Opt_grpjquota, "grpjquota=%s"},
1210 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
1211 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
1212 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
1213 {Opt_grpquota, "grpquota"},
1214 {Opt_noquota, "noquota"},
1215 {Opt_quota, "quota"},
1216 {Opt_usrquota, "usrquota"},
1217 {Opt_barrier, "barrier=%u"},
1218 {Opt_barrier, "barrier"},
1219 {Opt_nobarrier, "nobarrier"},
1220 {Opt_i_version, "i_version"},
1221 {Opt_stripe, "stripe=%u"},
1222 {Opt_delalloc, "delalloc"},
1223 {Opt_nodelalloc, "nodelalloc"},
1224 {Opt_removed, "mblk_io_submit"},
1225 {Opt_removed, "nomblk_io_submit"},
1226 {Opt_block_validity, "block_validity"},
1227 {Opt_noblock_validity, "noblock_validity"},
1228 {Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
1229 {Opt_journal_ioprio, "journal_ioprio=%u"},
1230 {Opt_auto_da_alloc, "auto_da_alloc=%u"},
1231 {Opt_auto_da_alloc, "auto_da_alloc"},
1232 {Opt_noauto_da_alloc, "noauto_da_alloc"},
1233 {Opt_dioread_nolock, "dioread_nolock"},
1234 {Opt_dioread_lock, "dioread_lock"},
1235 {Opt_discard, "discard"},
1236 {Opt_nodiscard, "nodiscard"},
1237 {Opt_init_itable, "init_itable=%u"},
1238 {Opt_init_itable, "init_itable"},
1239 {Opt_noinit_itable, "noinit_itable"},
1240 {Opt_max_dir_size_kb, "max_dir_size_kb=%u"},
1241 {Opt_removed, "check=none"}, /* mount option from ext2/3 */
1242 {Opt_removed, "nocheck"}, /* mount option from ext2/3 */
1243 {Opt_removed, "reservation"}, /* mount option from ext2/3 */
1244 {Opt_removed, "noreservation"}, /* mount option from ext2/3 */
1245 {Opt_removed, "journal=%u"}, /* mount option from ext2/3 */
1246 {Opt_err, NULL},
1247 };
1248
1249 static ext4_fsblk_t get_sb_block(void **data)
1250 {
1251 ext4_fsblk_t sb_block;
1252 char *options = (char *) *data;
1253
1254 if (!options || strncmp(options, "sb=", 3) != 0)
1255 return 1; /* Default location */
1256
1257 options += 3;
1258 /* TODO: use simple_strtoll with >32bit ext4 */
1259 sb_block = simple_strtoul(options, &options, 0);
1260 if (*options && *options != ',') {
1261 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
1262 (char *) *data);
1263 return 1;
1264 }
1265 if (*options == ',')
1266 options++;
1267 *data = (void *) options;
1268
1269 return sb_block;
1270 }
1271
1272 #define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
1273 static char deprecated_msg[] = "Mount option \"%s\" will be removed by %s\n"
1274 "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
1275
1276 #ifdef CONFIG_QUOTA
1277 static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
1278 {
1279 struct ext4_sb_info *sbi = EXT4_SB(sb);
1280 char *qname;
1281 int ret = -1;
1282
1283 if (sb_any_quota_loaded(sb) &&
1284 !sbi->s_qf_names[qtype]) {
1285 ext4_msg(sb, KERN_ERR,
1286 "Cannot change journaled "
1287 "quota options when quota turned on");
1288 return -1;
1289 }
1290 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA)) {
1291 ext4_msg(sb, KERN_ERR, "Cannot set journaled quota options "
1292 "when QUOTA feature is enabled");
1293 return -1;
1294 }
1295 qname = match_strdup(args);
1296 if (!qname) {
1297 ext4_msg(sb, KERN_ERR,
1298 "Not enough memory for storing quotafile name");
1299 return -1;
1300 }
1301 if (sbi->s_qf_names[qtype]) {
1302 if (strcmp(sbi->s_qf_names[qtype], qname) == 0)
1303 ret = 1;
1304 else
1305 ext4_msg(sb, KERN_ERR,
1306 "%s quota file already specified",
1307 QTYPE2NAME(qtype));
1308 goto errout;
1309 }
1310 if (strchr(qname, '/')) {
1311 ext4_msg(sb, KERN_ERR,
1312 "quotafile must be on filesystem root");
1313 goto errout;
1314 }
1315 sbi->s_qf_names[qtype] = qname;
1316 set_opt(sb, QUOTA);
1317 return 1;
1318 errout:
1319 kfree(qname);
1320 return ret;
1321 }
1322
1323 static int clear_qf_name(struct super_block *sb, int qtype)
1324 {
1325
1326 struct ext4_sb_info *sbi = EXT4_SB(sb);
1327
1328 if (sb_any_quota_loaded(sb) &&
1329 sbi->s_qf_names[qtype]) {
1330 ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options"
1331 " when quota turned on");
1332 return -1;
1333 }
1334 kfree(sbi->s_qf_names[qtype]);
1335 sbi->s_qf_names[qtype] = NULL;
1336 return 1;
1337 }
1338 #endif
1339
1340 #define MOPT_SET 0x0001
1341 #define MOPT_CLEAR 0x0002
1342 #define MOPT_NOSUPPORT 0x0004
1343 #define MOPT_EXPLICIT 0x0008
1344 #define MOPT_CLEAR_ERR 0x0010
1345 #define MOPT_GTE0 0x0020
1346 #ifdef CONFIG_QUOTA
1347 #define MOPT_Q 0
1348 #define MOPT_QFMT 0x0040
1349 #else
1350 #define MOPT_Q MOPT_NOSUPPORT
1351 #define MOPT_QFMT MOPT_NOSUPPORT
1352 #endif
1353 #define MOPT_DATAJ 0x0080
1354 #define MOPT_NO_EXT2 0x0100
1355 #define MOPT_NO_EXT3 0x0200
1356 #define MOPT_EXT4_ONLY (MOPT_NO_EXT2 | MOPT_NO_EXT3)
1357 #define MOPT_STRING 0x0400
1358
1359 static const struct mount_opts {
1360 int token;
1361 int mount_opt;
1362 int flags;
1363 } ext4_mount_opts[] = {
1364 {Opt_minix_df, EXT4_MOUNT_MINIX_DF, MOPT_SET},
1365 {Opt_bsd_df, EXT4_MOUNT_MINIX_DF, MOPT_CLEAR},
1366 {Opt_grpid, EXT4_MOUNT_GRPID, MOPT_SET},
1367 {Opt_nogrpid, EXT4_MOUNT_GRPID, MOPT_CLEAR},
1368 {Opt_block_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_SET},
1369 {Opt_noblock_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_CLEAR},
1370 {Opt_dioread_nolock, EXT4_MOUNT_DIOREAD_NOLOCK,
1371 MOPT_EXT4_ONLY | MOPT_SET},
1372 {Opt_dioread_lock, EXT4_MOUNT_DIOREAD_NOLOCK,
1373 MOPT_EXT4_ONLY | MOPT_CLEAR},
1374 {Opt_discard, EXT4_MOUNT_DISCARD, MOPT_SET},
1375 {Opt_nodiscard, EXT4_MOUNT_DISCARD, MOPT_CLEAR},
1376 {Opt_delalloc, EXT4_MOUNT_DELALLOC,
1377 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
1378 {Opt_nodelalloc, EXT4_MOUNT_DELALLOC,
1379 MOPT_EXT4_ONLY | MOPT_CLEAR},
1380 {Opt_journal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
1381 MOPT_EXT4_ONLY | MOPT_SET},
1382 {Opt_journal_async_commit, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT |
1383 EXT4_MOUNT_JOURNAL_CHECKSUM),
1384 MOPT_EXT4_ONLY | MOPT_SET},
1385 {Opt_noload, EXT4_MOUNT_NOLOAD, MOPT_NO_EXT2 | MOPT_SET},
1386 {Opt_err_panic, EXT4_MOUNT_ERRORS_PANIC, MOPT_SET | MOPT_CLEAR_ERR},
1387 {Opt_err_ro, EXT4_MOUNT_ERRORS_RO, MOPT_SET | MOPT_CLEAR_ERR},
1388 {Opt_err_cont, EXT4_MOUNT_ERRORS_CONT, MOPT_SET | MOPT_CLEAR_ERR},
1389 {Opt_data_err_abort, EXT4_MOUNT_DATA_ERR_ABORT,
1390 MOPT_NO_EXT2 | MOPT_SET},
1391 {Opt_data_err_ignore, EXT4_MOUNT_DATA_ERR_ABORT,
1392 MOPT_NO_EXT2 | MOPT_CLEAR},
1393 {Opt_barrier, EXT4_MOUNT_BARRIER, MOPT_SET},
1394 {Opt_nobarrier, EXT4_MOUNT_BARRIER, MOPT_CLEAR},
1395 {Opt_noauto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_SET},
1396 {Opt_auto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_CLEAR},
1397 {Opt_noinit_itable, EXT4_MOUNT_INIT_INODE_TABLE, MOPT_CLEAR},
1398 {Opt_commit, 0, MOPT_GTE0},
1399 {Opt_max_batch_time, 0, MOPT_GTE0},
1400 {Opt_min_batch_time, 0, MOPT_GTE0},
1401 {Opt_inode_readahead_blks, 0, MOPT_GTE0},
1402 {Opt_init_itable, 0, MOPT_GTE0},
1403 {Opt_stripe, 0, MOPT_GTE0},
1404 {Opt_resuid, 0, MOPT_GTE0},
1405 {Opt_resgid, 0, MOPT_GTE0},
1406 {Opt_journal_dev, 0, MOPT_GTE0},
1407 {Opt_journal_path, 0, MOPT_STRING},
1408 {Opt_journal_ioprio, 0, MOPT_GTE0},
1409 {Opt_data_journal, EXT4_MOUNT_JOURNAL_DATA, MOPT_NO_EXT2 | MOPT_DATAJ},
1410 {Opt_data_ordered, EXT4_MOUNT_ORDERED_DATA, MOPT_NO_EXT2 | MOPT_DATAJ},
1411 {Opt_data_writeback, EXT4_MOUNT_WRITEBACK_DATA,
1412 MOPT_NO_EXT2 | MOPT_DATAJ},
1413 {Opt_user_xattr, EXT4_MOUNT_XATTR_USER, MOPT_SET},
1414 {Opt_nouser_xattr, EXT4_MOUNT_XATTR_USER, MOPT_CLEAR},
1415 #ifdef CONFIG_EXT4_FS_POSIX_ACL
1416 {Opt_acl, EXT4_MOUNT_POSIX_ACL, MOPT_SET},
1417 {Opt_noacl, EXT4_MOUNT_POSIX_ACL, MOPT_CLEAR},
1418 #else
1419 {Opt_acl, 0, MOPT_NOSUPPORT},
1420 {Opt_noacl, 0, MOPT_NOSUPPORT},
1421 #endif
1422 {Opt_nouid32, EXT4_MOUNT_NO_UID32, MOPT_SET},
1423 {Opt_debug, EXT4_MOUNT_DEBUG, MOPT_SET},
1424 {Opt_quota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA, MOPT_SET | MOPT_Q},
1425 {Opt_usrquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA,
1426 MOPT_SET | MOPT_Q},
1427 {Opt_grpquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_GRPQUOTA,
1428 MOPT_SET | MOPT_Q},
1429 {Opt_noquota, (EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA |
1430 EXT4_MOUNT_GRPQUOTA), MOPT_CLEAR | MOPT_Q},
1431 {Opt_usrjquota, 0, MOPT_Q},
1432 {Opt_grpjquota, 0, MOPT_Q},
1433 {Opt_offusrjquota, 0, MOPT_Q},
1434 {Opt_offgrpjquota, 0, MOPT_Q},
1435 {Opt_jqfmt_vfsold, QFMT_VFS_OLD, MOPT_QFMT},
1436 {Opt_jqfmt_vfsv0, QFMT_VFS_V0, MOPT_QFMT},
1437 {Opt_jqfmt_vfsv1, QFMT_VFS_V1, MOPT_QFMT},
1438 {Opt_max_dir_size_kb, 0, MOPT_GTE0},
1439 {Opt_err, 0, 0}
1440 };
1441
1442 static int handle_mount_opt(struct super_block *sb, char *opt, int token,
1443 substring_t *args, unsigned long *journal_devnum,
1444 unsigned int *journal_ioprio, int is_remount)
1445 {
1446 struct ext4_sb_info *sbi = EXT4_SB(sb);
1447 const struct mount_opts *m;
1448 kuid_t uid;
1449 kgid_t gid;
1450 int arg = 0;
1451
1452 #ifdef CONFIG_QUOTA
1453 if (token == Opt_usrjquota)
1454 return set_qf_name(sb, USRQUOTA, &args[0]);
1455 else if (token == Opt_grpjquota)
1456 return set_qf_name(sb, GRPQUOTA, &args[0]);
1457 else if (token == Opt_offusrjquota)
1458 return clear_qf_name(sb, USRQUOTA);
1459 else if (token == Opt_offgrpjquota)
1460 return clear_qf_name(sb, GRPQUOTA);
1461 #endif
1462 switch (token) {
1463 case Opt_noacl:
1464 case Opt_nouser_xattr:
1465 ext4_msg(sb, KERN_WARNING, deprecated_msg, opt, "3.5");
1466 break;
1467 case Opt_sb:
1468 return 1; /* handled by get_sb_block() */
1469 case Opt_removed:
1470 ext4_msg(sb, KERN_WARNING, "Ignoring removed %s option", opt);
1471 return 1;
1472 case Opt_abort:
1473 sbi->s_mount_flags |= EXT4_MF_FS_ABORTED;
1474 return 1;
1475 case Opt_i_version:
1476 sb->s_flags |= MS_I_VERSION;
1477 return 1;
1478 }
1479
1480 for (m = ext4_mount_opts; m->token != Opt_err; m++)
1481 if (token == m->token)
1482 break;
1483
1484 if (m->token == Opt_err) {
1485 ext4_msg(sb, KERN_ERR, "Unrecognized mount option \"%s\" "
1486 "or missing value", opt);
1487 return -1;
1488 }
1489
1490 if ((m->flags & MOPT_NO_EXT2) && IS_EXT2_SB(sb)) {
1491 ext4_msg(sb, KERN_ERR,
1492 "Mount option \"%s\" incompatible with ext2", opt);
1493 return -1;
1494 }
1495 if ((m->flags & MOPT_NO_EXT3) && IS_EXT3_SB(sb)) {
1496 ext4_msg(sb, KERN_ERR,
1497 "Mount option \"%s\" incompatible with ext3", opt);
1498 return -1;
1499 }
1500
1501 if (args->from && !(m->flags & MOPT_STRING) && match_int(args, &arg))
1502 return -1;
1503 if (args->from && (m->flags & MOPT_GTE0) && (arg < 0))
1504 return -1;
1505 if (m->flags & MOPT_EXPLICIT)
1506 set_opt2(sb, EXPLICIT_DELALLOC);
1507 if (m->flags & MOPT_CLEAR_ERR)
1508 clear_opt(sb, ERRORS_MASK);
1509 if (token == Opt_noquota && sb_any_quota_loaded(sb)) {
1510 ext4_msg(sb, KERN_ERR, "Cannot change quota "
1511 "options when quota turned on");
1512 return -1;
1513 }
1514
1515 if (m->flags & MOPT_NOSUPPORT) {
1516 ext4_msg(sb, KERN_ERR, "%s option not supported", opt);
1517 } else if (token == Opt_commit) {
1518 if (arg == 0)
1519 arg = JBD2_DEFAULT_MAX_COMMIT_AGE;
1520 sbi->s_commit_interval = HZ * arg;
1521 } else if (token == Opt_max_batch_time) {
1522 if (arg == 0)
1523 arg = EXT4_DEF_MAX_BATCH_TIME;
1524 sbi->s_max_batch_time = arg;
1525 } else if (token == Opt_min_batch_time) {
1526 sbi->s_min_batch_time = arg;
1527 } else if (token == Opt_inode_readahead_blks) {
1528 if (arg && (arg > (1 << 30) || !is_power_of_2(arg))) {
1529 ext4_msg(sb, KERN_ERR,
1530 "EXT4-fs: inode_readahead_blks must be "
1531 "0 or a power of 2 smaller than 2^31");
1532 return -1;
1533 }
1534 sbi->s_inode_readahead_blks = arg;
1535 } else if (token == Opt_init_itable) {
1536 set_opt(sb, INIT_INODE_TABLE);
1537 if (!args->from)
1538 arg = EXT4_DEF_LI_WAIT_MULT;
1539 sbi->s_li_wait_mult = arg;
1540 } else if (token == Opt_max_dir_size_kb) {
1541 sbi->s_max_dir_size_kb = arg;
1542 } else if (token == Opt_stripe) {
1543 sbi->s_stripe = arg;
1544 } else if (token == Opt_resuid) {
1545 uid = make_kuid(current_user_ns(), arg);
1546 if (!uid_valid(uid)) {
1547 ext4_msg(sb, KERN_ERR, "Invalid uid value %d", arg);
1548 return -1;
1549 }
1550 sbi->s_resuid = uid;
1551 } else if (token == Opt_resgid) {
1552 gid = make_kgid(current_user_ns(), arg);
1553 if (!gid_valid(gid)) {
1554 ext4_msg(sb, KERN_ERR, "Invalid gid value %d", arg);
1555 return -1;
1556 }
1557 sbi->s_resgid = gid;
1558 } else if (token == Opt_journal_dev) {
1559 if (is_remount) {
1560 ext4_msg(sb, KERN_ERR,
1561 "Cannot specify journal on remount");
1562 return -1;
1563 }
1564 *journal_devnum = arg;
1565 } else if (token == Opt_journal_path) {
1566 char *journal_path;
1567 struct inode *journal_inode;
1568 struct path path;
1569 int error;
1570
1571 if (is_remount) {
1572 ext4_msg(sb, KERN_ERR,
1573 "Cannot specify journal on remount");
1574 return -1;
1575 }
1576 journal_path = match_strdup(&args[0]);
1577 if (!journal_path) {
1578 ext4_msg(sb, KERN_ERR, "error: could not dup "
1579 "journal device string");
1580 return -1;
1581 }
1582
1583 error = kern_path(journal_path, LOOKUP_FOLLOW, &path);
1584 if (error) {
1585 ext4_msg(sb, KERN_ERR, "error: could not find "
1586 "journal device path: error %d", error);
1587 kfree(journal_path);
1588 return -1;
1589 }
1590
1591 journal_inode = path.dentry->d_inode;
1592 if (!S_ISBLK(journal_inode->i_mode)) {
1593 ext4_msg(sb, KERN_ERR, "error: journal path %s "
1594 "is not a block device", journal_path);
1595 path_put(&path);
1596 kfree(journal_path);
1597 return -1;
1598 }
1599
1600 *journal_devnum = new_encode_dev(journal_inode->i_rdev);
1601 path_put(&path);
1602 kfree(journal_path);
1603 } else if (token == Opt_journal_ioprio) {
1604 if (arg > 7) {
1605 ext4_msg(sb, KERN_ERR, "Invalid journal IO priority"
1606 " (must be 0-7)");
1607 return -1;
1608 }
1609 *journal_ioprio =
1610 IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, arg);
1611 } else if (m->flags & MOPT_DATAJ) {
1612 if (is_remount) {
1613 if (!sbi->s_journal)
1614 ext4_msg(sb, KERN_WARNING, "Remounting file system with no journal so ignoring journalled data option");
1615 else if (test_opt(sb, DATA_FLAGS) != m->mount_opt) {
1616 ext4_msg(sb, KERN_ERR,
1617 "Cannot change data mode on remount");
1618 return -1;
1619 }
1620 } else {
1621 clear_opt(sb, DATA_FLAGS);
1622 sbi->s_mount_opt |= m->mount_opt;
1623 }
1624 #ifdef CONFIG_QUOTA
1625 } else if (m->flags & MOPT_QFMT) {
1626 if (sb_any_quota_loaded(sb) &&
1627 sbi->s_jquota_fmt != m->mount_opt) {
1628 ext4_msg(sb, KERN_ERR, "Cannot change journaled "
1629 "quota options when quota turned on");
1630 return -1;
1631 }
1632 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
1633 EXT4_FEATURE_RO_COMPAT_QUOTA)) {
1634 ext4_msg(sb, KERN_ERR,
1635 "Cannot set journaled quota options "
1636 "when QUOTA feature is enabled");
1637 return -1;
1638 }
1639 sbi->s_jquota_fmt = m->mount_opt;
1640 #endif
1641 } else {
1642 if (!args->from)
1643 arg = 1;
1644 if (m->flags & MOPT_CLEAR)
1645 arg = !arg;
1646 else if (unlikely(!(m->flags & MOPT_SET))) {
1647 ext4_msg(sb, KERN_WARNING,
1648 "buggy handling of option %s", opt);
1649 WARN_ON(1);
1650 return -1;
1651 }
1652 if (arg != 0)
1653 sbi->s_mount_opt |= m->mount_opt;
1654 else
1655 sbi->s_mount_opt &= ~m->mount_opt;
1656 }
1657 return 1;
1658 }
1659
1660 static int parse_options(char *options, struct super_block *sb,
1661 unsigned long *journal_devnum,
1662 unsigned int *journal_ioprio,
1663 int is_remount)
1664 {
1665 struct ext4_sb_info *sbi = EXT4_SB(sb);
1666 char *p;
1667 substring_t args[MAX_OPT_ARGS];
1668 int token;
1669
1670 if (!options)
1671 return 1;
1672
1673 while ((p = strsep(&options, ",")) != NULL) {
1674 if (!*p)
1675 continue;
1676 /*
1677 * Initialize args struct so we know whether arg was
1678 * found; some options take optional arguments.
1679 */
1680 args[0].to = args[0].from = NULL;
1681 token = match_token(p, tokens, args);
1682 if (handle_mount_opt(sb, p, token, args, journal_devnum,
1683 journal_ioprio, is_remount) < 0)
1684 return 0;
1685 }
1686 #ifdef CONFIG_QUOTA
1687 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) &&
1688 (test_opt(sb, USRQUOTA) || test_opt(sb, GRPQUOTA))) {
1689 ext4_msg(sb, KERN_ERR, "Cannot set quota options when QUOTA "
1690 "feature is enabled");
1691 return 0;
1692 }
1693 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1694 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
1695 clear_opt(sb, USRQUOTA);
1696
1697 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
1698 clear_opt(sb, GRPQUOTA);
1699
1700 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
1701 ext4_msg(sb, KERN_ERR, "old and new quota "
1702 "format mixing");
1703 return 0;
1704 }
1705
1706 if (!sbi->s_jquota_fmt) {
1707 ext4_msg(sb, KERN_ERR, "journaled quota format "
1708 "not specified");
1709 return 0;
1710 }
1711 } else {
1712 if (sbi->s_jquota_fmt) {
1713 ext4_msg(sb, KERN_ERR, "journaled quota format "
1714 "specified with no journaling "
1715 "enabled");
1716 return 0;
1717 }
1718 }
1719 #endif
1720 if (test_opt(sb, DIOREAD_NOLOCK)) {
1721 int blocksize =
1722 BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);
1723
1724 if (blocksize < PAGE_CACHE_SIZE) {
1725 ext4_msg(sb, KERN_ERR, "can't mount with "
1726 "dioread_nolock if block size != PAGE_SIZE");
1727 return 0;
1728 }
1729 }
1730 return 1;
1731 }
1732
1733 static inline void ext4_show_quota_options(struct seq_file *seq,
1734 struct super_block *sb)
1735 {
1736 #if defined(CONFIG_QUOTA)
1737 struct ext4_sb_info *sbi = EXT4_SB(sb);
1738
1739 if (sbi->s_jquota_fmt) {
1740 char *fmtname = "";
1741
1742 switch (sbi->s_jquota_fmt) {
1743 case QFMT_VFS_OLD:
1744 fmtname = "vfsold";
1745 break;
1746 case QFMT_VFS_V0:
1747 fmtname = "vfsv0";
1748 break;
1749 case QFMT_VFS_V1:
1750 fmtname = "vfsv1";
1751 break;
1752 }
1753 seq_printf(seq, ",jqfmt=%s", fmtname);
1754 }
1755
1756 if (sbi->s_qf_names[USRQUOTA])
1757 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
1758
1759 if (sbi->s_qf_names[GRPQUOTA])
1760 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
1761 #endif
1762 }
1763
1764 static const char *token2str(int token)
1765 {
1766 const struct match_token *t;
1767
1768 for (t = tokens; t->token != Opt_err; t++)
1769 if (t->token == token && !strchr(t->pattern, '='))
1770 break;
1771 return t->pattern;
1772 }
1773
1774 /*
1775 * Show an option if
1776 * - it's set to a non-default value OR
1777 * - if the per-sb default is different from the global default
1778 */
1779 static int _ext4_show_options(struct seq_file *seq, struct super_block *sb,
1780 int nodefs)
1781 {
1782 struct ext4_sb_info *sbi = EXT4_SB(sb);
1783 struct ext4_super_block *es = sbi->s_es;
1784 int def_errors, def_mount_opt = nodefs ? 0 : sbi->s_def_mount_opt;
1785 const struct mount_opts *m;
1786 char sep = nodefs ? '\n' : ',';
1787
1788 #define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep)
1789 #define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg)
1790
1791 if (sbi->s_sb_block != 1)
1792 SEQ_OPTS_PRINT("sb=%llu", sbi->s_sb_block);
1793
1794 for (m = ext4_mount_opts; m->token != Opt_err; m++) {
1795 int want_set = m->flags & MOPT_SET;
1796 if (((m->flags & (MOPT_SET|MOPT_CLEAR)) == 0) ||
1797 (m->flags & MOPT_CLEAR_ERR))
1798 continue;
1799 if (!(m->mount_opt & (sbi->s_mount_opt ^ def_mount_opt)))
1800 continue; /* skip if same as the default */
1801 if ((want_set &&
1802 (sbi->s_mount_opt & m->mount_opt) != m->mount_opt) ||
1803 (!want_set && (sbi->s_mount_opt & m->mount_opt)))
1804 continue; /* select Opt_noFoo vs Opt_Foo */
1805 SEQ_OPTS_PRINT("%s", token2str(m->token));
1806 }
1807
1808 if (nodefs || !uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT4_DEF_RESUID)) ||
1809 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID)
1810 SEQ_OPTS_PRINT("resuid=%u",
1811 from_kuid_munged(&init_user_ns, sbi->s_resuid));
1812 if (nodefs || !gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT4_DEF_RESGID)) ||
1813 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID)
1814 SEQ_OPTS_PRINT("resgid=%u",
1815 from_kgid_munged(&init_user_ns, sbi->s_resgid));
1816 def_errors = nodefs ? -1 : le16_to_cpu(es->s_errors);
1817 if (test_opt(sb, ERRORS_RO) && def_errors != EXT4_ERRORS_RO)
1818 SEQ_OPTS_PUTS("errors=remount-ro");
1819 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
1820 SEQ_OPTS_PUTS("errors=continue");
1821 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
1822 SEQ_OPTS_PUTS("errors=panic");
1823 if (nodefs || sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ)
1824 SEQ_OPTS_PRINT("commit=%lu", sbi->s_commit_interval / HZ);
1825 if (nodefs || sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME)
1826 SEQ_OPTS_PRINT("min_batch_time=%u", sbi->s_min_batch_time);
1827 if (nodefs || sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME)
1828 SEQ_OPTS_PRINT("max_batch_time=%u", sbi->s_max_batch_time);
1829 if (sb->s_flags & MS_I_VERSION)
1830 SEQ_OPTS_PUTS("i_version");
1831 if (nodefs || sbi->s_stripe)
1832 SEQ_OPTS_PRINT("stripe=%lu", sbi->s_stripe);
1833 if (EXT4_MOUNT_DATA_FLAGS & (sbi->s_mount_opt ^ def_mount_opt)) {
1834 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
1835 SEQ_OPTS_PUTS("data=journal");
1836 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
1837 SEQ_OPTS_PUTS("data=ordered");
1838 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
1839 SEQ_OPTS_PUTS("data=writeback");
1840 }
1841 if (nodefs ||
1842 sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
1843 SEQ_OPTS_PRINT("inode_readahead_blks=%u",
1844 sbi->s_inode_readahead_blks);
1845
1846 if (nodefs || (test_opt(sb, INIT_INODE_TABLE) &&
1847 (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT)))
1848 SEQ_OPTS_PRINT("init_itable=%u", sbi->s_li_wait_mult);
1849 if (nodefs || sbi->s_max_dir_size_kb)
1850 SEQ_OPTS_PRINT("max_dir_size_kb=%u", sbi->s_max_dir_size_kb);
1851
1852 ext4_show_quota_options(seq, sb);
1853 return 0;
1854 }
1855
1856 static int ext4_show_options(struct seq_file *seq, struct dentry *root)
1857 {
1858 return _ext4_show_options(seq, root->d_sb, 0);
1859 }
1860
1861 static int options_seq_show(struct seq_file *seq, void *offset)
1862 {
1863 struct super_block *sb = seq->private;
1864 int rc;
1865
1866 seq_puts(seq, (sb->s_flags & MS_RDONLY) ? "ro" : "rw");
1867 rc = _ext4_show_options(seq, sb, 1);
1868 seq_puts(seq, "\n");
1869 return rc;
1870 }
1871
1872 static int options_open_fs(struct inode *inode, struct file *file)
1873 {
1874 return single_open(file, options_seq_show, PDE_DATA(inode));
1875 }
1876
1877 static const struct file_operations ext4_seq_options_fops = {
1878 .owner = THIS_MODULE,
1879 .open = options_open_fs,
1880 .read = seq_read,
1881 .llseek = seq_lseek,
1882 .release = single_release,
1883 };
1884
1885 static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
1886 int read_only)
1887 {
1888 struct ext4_sb_info *sbi = EXT4_SB(sb);
1889 int res = 0;
1890
1891 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
1892 ext4_msg(sb, KERN_ERR, "revision level too high, "
1893 "forcing read-only mode");
1894 res = MS_RDONLY;
1895 }
1896 if (read_only)
1897 goto done;
1898 if (!(sbi->s_mount_state & EXT4_VALID_FS))
1899 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
1900 "running e2fsck is recommended");
1901 else if ((sbi->s_mount_state & EXT4_ERROR_FS))
1902 ext4_msg(sb, KERN_WARNING,
1903 "warning: mounting fs with errors, "
1904 "running e2fsck is recommended");
1905 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
1906 le16_to_cpu(es->s_mnt_count) >=
1907 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
1908 ext4_msg(sb, KERN_WARNING,
1909 "warning: maximal mount count reached, "
1910 "running e2fsck is recommended");
1911 else if (le32_to_cpu(es->s_checkinterval) &&
1912 (le32_to_cpu(es->s_lastcheck) +
1913 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1914 ext4_msg(sb, KERN_WARNING,
1915 "warning: checktime reached, "
1916 "running e2fsck is recommended");
1917 if (!sbi->s_journal)
1918 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
1919 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
1920 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
1921 le16_add_cpu(&es->s_mnt_count, 1);
1922 es->s_mtime = cpu_to_le32(get_seconds());
1923 ext4_update_dynamic_rev(sb);
1924 if (sbi->s_journal)
1925 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
1926
1927 ext4_commit_super(sb, 1);
1928 done:
1929 if (test_opt(sb, DEBUG))
1930 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
1931 "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
1932 sb->s_blocksize,
1933 sbi->s_groups_count,
1934 EXT4_BLOCKS_PER_GROUP(sb),
1935 EXT4_INODES_PER_GROUP(sb),
1936 sbi->s_mount_opt, sbi->s_mount_opt2);
1937
1938 cleancache_init_fs(sb);
1939 return res;
1940 }
1941
1942 int ext4_alloc_flex_bg_array(struct super_block *sb, ext4_group_t ngroup)
1943 {
1944 struct ext4_sb_info *sbi = EXT4_SB(sb);
1945 struct flex_groups *new_groups;
1946 int size;
1947
1948 if (!sbi->s_log_groups_per_flex)
1949 return 0;
1950
1951 size = ext4_flex_group(sbi, ngroup - 1) + 1;
1952 if (size <= sbi->s_flex_groups_allocated)
1953 return 0;
1954
1955 size = roundup_pow_of_two(size * sizeof(struct flex_groups));
1956 new_groups = ext4_kvzalloc(size, GFP_KERNEL);
1957 if (!new_groups) {
1958 ext4_msg(sb, KERN_ERR, "not enough memory for %d flex groups",
1959 size / (int) sizeof(struct flex_groups));
1960 return -ENOMEM;
1961 }
1962
1963 if (sbi->s_flex_groups) {
1964 memcpy(new_groups, sbi->s_flex_groups,
1965 (sbi->s_flex_groups_allocated *
1966 sizeof(struct flex_groups)));
1967 ext4_kvfree(sbi->s_flex_groups);
1968 }
1969 sbi->s_flex_groups = new_groups;
1970 sbi->s_flex_groups_allocated = size / sizeof(struct flex_groups);
1971 return 0;
1972 }
1973
1974 static int ext4_fill_flex_info(struct super_block *sb)
1975 {
1976 struct ext4_sb_info *sbi = EXT4_SB(sb);
1977 struct ext4_group_desc *gdp = NULL;
1978 ext4_group_t flex_group;
1979 int i, err;
1980
1981 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
1982 if (sbi->s_log_groups_per_flex < 1 || sbi->s_log_groups_per_flex > 31) {
1983 sbi->s_log_groups_per_flex = 0;
1984 return 1;
1985 }
1986
1987 err = ext4_alloc_flex_bg_array(sb, sbi->s_groups_count);
1988 if (err)
1989 goto failed;
1990
1991 for (i = 0; i < sbi->s_groups_count; i++) {
1992 gdp = ext4_get_group_desc(sb, i, NULL);
1993
1994 flex_group = ext4_flex_group(sbi, i);
1995 atomic_add(ext4_free_inodes_count(sb, gdp),
1996 &sbi->s_flex_groups[flex_group].free_inodes);
1997 atomic64_add(ext4_free_group_clusters(sb, gdp),
1998 &sbi->s_flex_groups[flex_group].free_clusters);
1999 atomic_add(ext4_used_dirs_count(sb, gdp),
2000 &sbi->s_flex_groups[flex_group].used_dirs);
2001 }
2002
2003 return 1;
2004 failed:
2005 return 0;
2006 }
2007
2008 static __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
2009 struct ext4_group_desc *gdp)
2010 {
2011 int offset;
2012 __u16 crc = 0;
2013 __le32 le_group = cpu_to_le32(block_group);
2014
2015 if ((sbi->s_es->s_feature_ro_compat &
2016 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))) {
2017 /* Use new metadata_csum algorithm */
2018 __le16 save_csum;
2019 __u32 csum32;
2020
2021 save_csum = gdp->bg_checksum;
2022 gdp->bg_checksum = 0;
2023 csum32 = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&le_group,
2024 sizeof(le_group));
2025 csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp,
2026 sbi->s_desc_size);
2027 gdp->bg_checksum = save_csum;
2028
2029 crc = csum32 & 0xFFFF;
2030 goto out;
2031 }
2032
2033 /* old crc16 code */
2034 offset = offsetof(struct ext4_group_desc, bg_checksum);
2035
2036 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
2037 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
2038 crc = crc16(crc, (__u8 *)gdp, offset);
2039 offset += sizeof(gdp->bg_checksum); /* skip checksum */
2040 /* for checksum of struct ext4_group_desc do the rest...*/
2041 if ((sbi->s_es->s_feature_incompat &
2042 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) &&
2043 offset < le16_to_cpu(sbi->s_es->s_desc_size))
2044 crc = crc16(crc, (__u8 *)gdp + offset,
2045 le16_to_cpu(sbi->s_es->s_desc_size) -
2046 offset);
2047
2048 out:
2049 return cpu_to_le16(crc);
2050 }
2051
2052 int ext4_group_desc_csum_verify(struct super_block *sb, __u32 block_group,
2053 struct ext4_group_desc *gdp)
2054 {
2055 if (ext4_has_group_desc_csum(sb) &&
2056 (gdp->bg_checksum != ext4_group_desc_csum(EXT4_SB(sb),
2057 block_group, gdp)))
2058 return 0;
2059
2060 return 1;
2061 }
2062
2063 void ext4_group_desc_csum_set(struct super_block *sb, __u32 block_group,
2064 struct ext4_group_desc *gdp)
2065 {
2066 if (!ext4_has_group_desc_csum(sb))
2067 return;
2068 gdp->bg_checksum = ext4_group_desc_csum(EXT4_SB(sb), block_group, gdp);
2069 }
2070
2071 /* Called at mount-time, super-block is locked */
2072 static int ext4_check_descriptors(struct super_block *sb,
2073 ext4_group_t *first_not_zeroed)
2074 {
2075 struct ext4_sb_info *sbi = EXT4_SB(sb);
2076 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
2077 ext4_fsblk_t last_block;
2078 ext4_fsblk_t block_bitmap;
2079 ext4_fsblk_t inode_bitmap;
2080 ext4_fsblk_t inode_table;
2081 int flexbg_flag = 0;
2082 ext4_group_t i, grp = sbi->s_groups_count;
2083
2084 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
2085 flexbg_flag = 1;
2086
2087 ext4_debug("Checking group descriptors");
2088
2089 for (i = 0; i < sbi->s_groups_count; i++) {
2090 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
2091
2092 if (i == sbi->s_groups_count - 1 || flexbg_flag)
2093 last_block = ext4_blocks_count(sbi->s_es) - 1;
2094 else
2095 last_block = first_block +
2096 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
2097
2098 if ((grp == sbi->s_groups_count) &&
2099 !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2100 grp = i;
2101
2102 block_bitmap = ext4_block_bitmap(sb, gdp);
2103 if (block_bitmap < first_block || block_bitmap > last_block) {
2104 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2105 "Block bitmap for group %u not in group "
2106 "(block %llu)!", i, block_bitmap);
2107 return 0;
2108 }
2109 inode_bitmap = ext4_inode_bitmap(sb, gdp);
2110 if (inode_bitmap < first_block || inode_bitmap > last_block) {
2111 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2112 "Inode bitmap for group %u not in group "
2113 "(block %llu)!", i, inode_bitmap);
2114 return 0;
2115 }
2116 inode_table = ext4_inode_table(sb, gdp);
2117 if (inode_table < first_block ||
2118 inode_table + sbi->s_itb_per_group - 1 > last_block) {
2119 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2120 "Inode table for group %u not in group "
2121 "(block %llu)!", i, inode_table);
2122 return 0;
2123 }
2124 ext4_lock_group(sb, i);
2125 if (!ext4_group_desc_csum_verify(sb, i, gdp)) {
2126 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2127 "Checksum for group %u failed (%u!=%u)",
2128 i, le16_to_cpu(ext4_group_desc_csum(sbi, i,
2129 gdp)), le16_to_cpu(gdp->bg_checksum));
2130 if (!(sb->s_flags & MS_RDONLY)) {
2131 ext4_unlock_group(sb, i);
2132 return 0;
2133 }
2134 }
2135 ext4_unlock_group(sb, i);
2136 if (!flexbg_flag)
2137 first_block += EXT4_BLOCKS_PER_GROUP(sb);
2138 }
2139 if (NULL != first_not_zeroed)
2140 *first_not_zeroed = grp;
2141
2142 ext4_free_blocks_count_set(sbi->s_es,
2143 EXT4_C2B(sbi, ext4_count_free_clusters(sb)));
2144 sbi->s_es->s_free_inodes_count =cpu_to_le32(ext4_count_free_inodes(sb));
2145 return 1;
2146 }
2147
2148 /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
2149 * the superblock) which were deleted from all directories, but held open by
2150 * a process at the time of a crash. We walk the list and try to delete these
2151 * inodes at recovery time (only with a read-write filesystem).
2152 *
2153 * In order to keep the orphan inode chain consistent during traversal (in
2154 * case of crash during recovery), we link each inode into the superblock
2155 * orphan list_head and handle it the same way as an inode deletion during
2156 * normal operation (which journals the operations for us).
2157 *
2158 * We only do an iget() and an iput() on each inode, which is very safe if we
2159 * accidentally point at an in-use or already deleted inode. The worst that
2160 * can happen in this case is that we get a "bit already cleared" message from
2161 * ext4_free_inode(). The only reason we would point at a wrong inode is if
2162 * e2fsck was run on this filesystem, and it must have already done the orphan
2163 * inode cleanup for us, so we can safely abort without any further action.
2164 */
2165 static void ext4_orphan_cleanup(struct super_block *sb,
2166 struct ext4_super_block *es)
2167 {
2168 unsigned int s_flags = sb->s_flags;
2169 int nr_orphans = 0, nr_truncates = 0;
2170 #ifdef CONFIG_QUOTA
2171 int i;
2172 #endif
2173 if (!es->s_last_orphan) {
2174 jbd_debug(4, "no orphan inodes to clean up\n");
2175 return;
2176 }
2177
2178 if (bdev_read_only(sb->s_bdev)) {
2179 ext4_msg(sb, KERN_ERR, "write access "
2180 "unavailable, skipping orphan cleanup");
2181 return;
2182 }
2183
2184 /* Check if feature set would not allow a r/w mount */
2185 if (!ext4_feature_set_ok(sb, 0)) {
2186 ext4_msg(sb, KERN_INFO, "Skipping orphan cleanup due to "
2187 "unknown ROCOMPAT features");
2188 return;
2189 }
2190
2191 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
2192 /* don't clear list on RO mount w/ errors */
2193 if (es->s_last_orphan && !(s_flags & MS_RDONLY)) {
2194 jbd_debug(1, "Errors on filesystem, "
2195 "clearing orphan list.\n");
2196 es->s_last_orphan = 0;
2197 }
2198 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2199 return;
2200 }
2201
2202 if (s_flags & MS_RDONLY) {
2203 ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
2204 sb->s_flags &= ~MS_RDONLY;
2205 }
2206 #ifdef CONFIG_QUOTA
2207 /* Needed for iput() to work correctly and not trash data */
2208 sb->s_flags |= MS_ACTIVE;
2209 /* Turn on quotas so that they are updated correctly */
2210 for (i = 0; i < MAXQUOTAS; i++) {
2211 if (EXT4_SB(sb)->s_qf_names[i]) {
2212 int ret = ext4_quota_on_mount(sb, i);
2213 if (ret < 0)
2214 ext4_msg(sb, KERN_ERR,
2215 "Cannot turn on journaled "
2216 "quota: error %d", ret);
2217 }
2218 }
2219 #endif
2220
2221 while (es->s_last_orphan) {
2222 struct inode *inode;
2223
2224 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
2225 if (IS_ERR(inode)) {
2226 es->s_last_orphan = 0;
2227 break;
2228 }
2229
2230 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
2231 dquot_initialize(inode);
2232 if (inode->i_nlink) {
2233 if (test_opt(sb, DEBUG))
2234 ext4_msg(sb, KERN_DEBUG,
2235 "%s: truncating inode %lu to %lld bytes",
2236 __func__, inode->i_ino, inode->i_size);
2237 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
2238 inode->i_ino, inode->i_size);
2239 mutex_lock(&inode->i_mutex);
2240 truncate_inode_pages(inode->i_mapping, inode->i_size);
2241 ext4_truncate(inode);
2242 mutex_unlock(&inode->i_mutex);
2243 nr_truncates++;
2244 } else {
2245 if (test_opt(sb, DEBUG))
2246 ext4_msg(sb, KERN_DEBUG,
2247 "%s: deleting unreferenced inode %lu",
2248 __func__, inode->i_ino);
2249 jbd_debug(2, "deleting unreferenced inode %lu\n",
2250 inode->i_ino);
2251 nr_orphans++;
2252 }
2253 iput(inode); /* The delete magic happens here! */
2254 }
2255
2256 #define PLURAL(x) (x), ((x) == 1) ? "" : "s"
2257
2258 if (nr_orphans)
2259 ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
2260 PLURAL(nr_orphans));
2261 if (nr_truncates)
2262 ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
2263 PLURAL(nr_truncates));
2264 #ifdef CONFIG_QUOTA
2265 /* Turn quotas off */
2266 for (i = 0; i < MAXQUOTAS; i++) {
2267 if (sb_dqopt(sb)->files[i])
2268 dquot_quota_off(sb, i);
2269 }
2270 #endif
2271 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
2272 }
2273
2274 /*
2275 * Maximal extent format file size.
2276 * Resulting logical blkno at s_maxbytes must fit in our on-disk
2277 * extent format containers, within a sector_t, and within i_blocks
2278 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
2279 * so that won't be a limiting factor.
2280 *
2281 * However there is other limiting factor. We do store extents in the form
2282 * of starting block and length, hence the resulting length of the extent
2283 * covering maximum file size must fit into on-disk format containers as
2284 * well. Given that length is always by 1 unit bigger than max unit (because
2285 * we count 0 as well) we have to lower the s_maxbytes by one fs block.
2286 *
2287 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
2288 */
2289 static loff_t ext4_max_size(int blkbits, int has_huge_files)
2290 {
2291 loff_t res;
2292 loff_t upper_limit = MAX_LFS_FILESIZE;
2293
2294 /* small i_blocks in vfs inode? */
2295 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
2296 /*
2297 * CONFIG_LBDAF is not enabled implies the inode
2298 * i_block represent total blocks in 512 bytes
2299 * 32 == size of vfs inode i_blocks * 8
2300 */
2301 upper_limit = (1LL << 32) - 1;
2302
2303 /* total blocks in file system block size */
2304 upper_limit >>= (blkbits - 9);
2305 upper_limit <<= blkbits;
2306 }
2307
2308 /*
2309 * 32-bit extent-start container, ee_block. We lower the maxbytes
2310 * by one fs block, so ee_len can cover the extent of maximum file
2311 * size
2312 */
2313 res = (1LL << 32) - 1;
2314 res <<= blkbits;
2315
2316 /* Sanity check against vm- & vfs- imposed limits */
2317 if (res > upper_limit)
2318 res = upper_limit;
2319
2320 return res;
2321 }
2322
2323 /*
2324 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
2325 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2326 * We need to be 1 filesystem block less than the 2^48 sector limit.
2327 */
2328 static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
2329 {
2330 loff_t res = EXT4_NDIR_BLOCKS;
2331 int meta_blocks;
2332 loff_t upper_limit;
2333 /* This is calculated to be the largest file size for a dense, block
2334 * mapped file such that the file's total number of 512-byte sectors,
2335 * including data and all indirect blocks, does not exceed (2^48 - 1).
2336 *
2337 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2338 * number of 512-byte sectors of the file.
2339 */
2340
2341 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
2342 /*
2343 * !has_huge_files or CONFIG_LBDAF not enabled implies that
2344 * the inode i_block field represents total file blocks in
2345 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
2346 */
2347 upper_limit = (1LL << 32) - 1;
2348
2349 /* total blocks in file system block size */
2350 upper_limit >>= (bits - 9);
2351
2352 } else {
2353 /*
2354 * We use 48 bit ext4_inode i_blocks
2355 * With EXT4_HUGE_FILE_FL set the i_blocks
2356 * represent total number of blocks in
2357 * file system block size
2358 */
2359 upper_limit = (1LL << 48) - 1;
2360
2361 }
2362
2363 /* indirect blocks */
2364 meta_blocks = 1;
2365 /* double indirect blocks */
2366 meta_blocks += 1 + (1LL << (bits-2));
2367 /* tripple indirect blocks */
2368 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
2369
2370 upper_limit -= meta_blocks;
2371 upper_limit <<= bits;
2372
2373 res += 1LL << (bits-2);
2374 res += 1LL << (2*(bits-2));
2375 res += 1LL << (3*(bits-2));
2376 res <<= bits;
2377 if (res > upper_limit)
2378 res = upper_limit;
2379
2380 if (res > MAX_LFS_FILESIZE)
2381 res = MAX_LFS_FILESIZE;
2382
2383 return res;
2384 }
2385
2386 static ext4_fsblk_t descriptor_loc(struct super_block *sb,
2387 ext4_fsblk_t logical_sb_block, int nr)
2388 {
2389 struct ext4_sb_info *sbi = EXT4_SB(sb);
2390 ext4_group_t bg, first_meta_bg;
2391 int has_super = 0;
2392
2393 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
2394
2395 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
2396 nr < first_meta_bg)
2397 return logical_sb_block + nr + 1;
2398 bg = sbi->s_desc_per_block * nr;
2399 if (ext4_bg_has_super(sb, bg))
2400 has_super = 1;
2401
2402 return (has_super + ext4_group_first_block_no(sb, bg));
2403 }
2404
2405 /**
2406 * ext4_get_stripe_size: Get the stripe size.
2407 * @sbi: In memory super block info
2408 *
2409 * If we have specified it via mount option, then
2410 * use the mount option value. If the value specified at mount time is
2411 * greater than the blocks per group use the super block value.
2412 * If the super block value is greater than blocks per group return 0.
2413 * Allocator needs it be less than blocks per group.
2414 *
2415 */
2416 static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
2417 {
2418 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
2419 unsigned long stripe_width =
2420 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
2421 int ret;
2422
2423 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
2424 ret = sbi->s_stripe;
2425 else if (stripe_width <= sbi->s_blocks_per_group)
2426 ret = stripe_width;
2427 else if (stride <= sbi->s_blocks_per_group)
2428 ret = stride;
2429 else
2430 ret = 0;
2431
2432 /*
2433 * If the stripe width is 1, this makes no sense and
2434 * we set it to 0 to turn off stripe handling code.
2435 */
2436 if (ret <= 1)
2437 ret = 0;
2438
2439 return ret;
2440 }
2441
2442 /* sysfs supprt */
2443
2444 struct ext4_attr {
2445 struct attribute attr;
2446 ssize_t (*show)(struct ext4_attr *, struct ext4_sb_info *, char *);
2447 ssize_t (*store)(struct ext4_attr *, struct ext4_sb_info *,
2448 const char *, size_t);
2449 union {
2450 int offset;
2451 int deprecated_val;
2452 } u;
2453 };
2454
2455 static int parse_strtoull(const char *buf,
2456 unsigned long long max, unsigned long long *value)
2457 {
2458 int ret;
2459
2460 ret = kstrtoull(skip_spaces(buf), 0, value);
2461 if (!ret && *value > max)
2462 ret = -EINVAL;
2463 return ret;
2464 }
2465
2466 static ssize_t delayed_allocation_blocks_show(struct ext4_attr *a,
2467 struct ext4_sb_info *sbi,
2468 char *buf)
2469 {
2470 return snprintf(buf, PAGE_SIZE, "%llu\n",
2471 (s64) EXT4_C2B(sbi,
2472 percpu_counter_sum(&sbi->s_dirtyclusters_counter)));
2473 }
2474
2475 static ssize_t session_write_kbytes_show(struct ext4_attr *a,
2476 struct ext4_sb_info *sbi, char *buf)
2477 {
2478 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2479
2480 if (!sb->s_bdev->bd_part)
2481 return snprintf(buf, PAGE_SIZE, "0\n");
2482 return snprintf(buf, PAGE_SIZE, "%lu\n",
2483 (part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
2484 sbi->s_sectors_written_start) >> 1);
2485 }
2486
2487 static ssize_t lifetime_write_kbytes_show(struct ext4_attr *a,
2488 struct ext4_sb_info *sbi, char *buf)
2489 {
2490 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2491
2492 if (!sb->s_bdev->bd_part)
2493 return snprintf(buf, PAGE_SIZE, "0\n");
2494 return snprintf(buf, PAGE_SIZE, "%llu\n",
2495 (unsigned long long)(sbi->s_kbytes_written +
2496 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
2497 EXT4_SB(sb)->s_sectors_written_start) >> 1)));
2498 }
2499
2500 static ssize_t inode_readahead_blks_store(struct ext4_attr *a,
2501 struct ext4_sb_info *sbi,
2502 const char *buf, size_t count)
2503 {
2504 unsigned long t;
2505 int ret;
2506
2507 ret = kstrtoul(skip_spaces(buf), 0, &t);
2508 if (ret)
2509 return ret;
2510
2511 if (t && (!is_power_of_2(t) || t > 0x40000000))
2512 return -EINVAL;
2513
2514 sbi->s_inode_readahead_blks = t;
2515 return count;
2516 }
2517
2518 static ssize_t sbi_ui_show(struct ext4_attr *a,
2519 struct ext4_sb_info *sbi, char *buf)
2520 {
2521 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->u.offset);
2522
2523 return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
2524 }
2525
2526 static ssize_t sbi_ui_store(struct ext4_attr *a,
2527 struct ext4_sb_info *sbi,
2528 const char *buf, size_t count)
2529 {
2530 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->u.offset);
2531 unsigned long t;
2532 int ret;
2533
2534 ret = kstrtoul(skip_spaces(buf), 0, &t);
2535 if (ret)
2536 return ret;
2537 *ui = t;
2538 return count;
2539 }
2540
2541 static ssize_t reserved_clusters_show(struct ext4_attr *a,
2542 struct ext4_sb_info *sbi, char *buf)
2543 {
2544 return snprintf(buf, PAGE_SIZE, "%llu\n",
2545 (unsigned long long) atomic64_read(&sbi->s_resv_clusters));
2546 }
2547
2548 static ssize_t reserved_clusters_store(struct ext4_attr *a,
2549 struct ext4_sb_info *sbi,
2550 const char *buf, size_t count)
2551 {
2552 unsigned long long val;
2553 int ret;
2554
2555 if (parse_strtoull(buf, -1ULL, &val))
2556 return -EINVAL;
2557 ret = ext4_reserve_clusters(sbi, val);
2558
2559 return ret ? ret : count;
2560 }
2561
2562 static ssize_t trigger_test_error(struct ext4_attr *a,
2563 struct ext4_sb_info *sbi,
2564 const char *buf, size_t count)
2565 {
2566 int len = count;
2567
2568 if (!capable(CAP_SYS_ADMIN))
2569 return -EPERM;
2570
2571 if (len && buf[len-1] == '\n')
2572 len--;
2573
2574 if (len)
2575 ext4_error(sbi->s_sb, "%.*s", len, buf);
2576 return count;
2577 }
2578
2579 static ssize_t sbi_deprecated_show(struct ext4_attr *a,
2580 struct ext4_sb_info *sbi, char *buf)
2581 {
2582 return snprintf(buf, PAGE_SIZE, "%d\n", a->u.deprecated_val);
2583 }
2584
2585 #define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \
2586 static struct ext4_attr ext4_attr_##_name = { \
2587 .attr = {.name = __stringify(_name), .mode = _mode }, \
2588 .show = _show, \
2589 .store = _store, \
2590 .u = { \
2591 .offset = offsetof(struct ext4_sb_info, _elname),\
2592 }, \
2593 }
2594 #define EXT4_ATTR(name, mode, show, store) \
2595 static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store)
2596
2597 #define EXT4_INFO_ATTR(name) EXT4_ATTR(name, 0444, NULL, NULL)
2598 #define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL)
2599 #define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store)
2600 #define EXT4_RW_ATTR_SBI_UI(name, elname) \
2601 EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname)
2602 #define ATTR_LIST(name) &ext4_attr_##name.attr
2603 #define EXT4_DEPRECATED_ATTR(_name, _val) \
2604 static struct ext4_attr ext4_attr_##_name = { \
2605 .attr = {.name = __stringify(_name), .mode = 0444 }, \
2606 .show = sbi_deprecated_show, \
2607 .u = { \
2608 .deprecated_val = _val, \
2609 }, \
2610 }
2611
2612 EXT4_RO_ATTR(delayed_allocation_blocks);
2613 EXT4_RO_ATTR(session_write_kbytes);
2614 EXT4_RO_ATTR(lifetime_write_kbytes);
2615 EXT4_RW_ATTR(reserved_clusters);
2616 EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, sbi_ui_show,
2617 inode_readahead_blks_store, s_inode_readahead_blks);
2618 EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal);
2619 EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats);
2620 EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan);
2621 EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan);
2622 EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs);
2623 EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request);
2624 EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc);
2625 EXT4_DEPRECATED_ATTR(max_writeback_mb_bump, 128);
2626 EXT4_RW_ATTR_SBI_UI(extent_max_zeroout_kb, s_extent_max_zeroout_kb);
2627 EXT4_ATTR(trigger_fs_error, 0200, NULL, trigger_test_error);
2628 EXT4_RW_ATTR_SBI_UI(err_ratelimit_interval_ms, s_err_ratelimit_state.interval);
2629 EXT4_RW_ATTR_SBI_UI(err_ratelimit_burst, s_err_ratelimit_state.burst);
2630 EXT4_RW_ATTR_SBI_UI(warning_ratelimit_interval_ms, s_warning_ratelimit_state.interval);
2631 EXT4_RW_ATTR_SBI_UI(warning_ratelimit_burst, s_warning_ratelimit_state.burst);
2632 EXT4_RW_ATTR_SBI_UI(msg_ratelimit_interval_ms, s_msg_ratelimit_state.interval);
2633 EXT4_RW_ATTR_SBI_UI(msg_ratelimit_burst, s_msg_ratelimit_state.burst);
2634
2635 static struct attribute *ext4_attrs[] = {
2636 ATTR_LIST(delayed_allocation_blocks),
2637 ATTR_LIST(session_write_kbytes),
2638 ATTR_LIST(lifetime_write_kbytes),
2639 ATTR_LIST(reserved_clusters),
2640 ATTR_LIST(inode_readahead_blks),
2641 ATTR_LIST(inode_goal),
2642 ATTR_LIST(mb_stats),
2643 ATTR_LIST(mb_max_to_scan),
2644 ATTR_LIST(mb_min_to_scan),
2645 ATTR_LIST(mb_order2_req),
2646 ATTR_LIST(mb_stream_req),
2647 ATTR_LIST(mb_group_prealloc),
2648 ATTR_LIST(max_writeback_mb_bump),
2649 ATTR_LIST(extent_max_zeroout_kb),
2650 ATTR_LIST(trigger_fs_error),
2651 ATTR_LIST(err_ratelimit_interval_ms),
2652 ATTR_LIST(err_ratelimit_burst),
2653 ATTR_LIST(warning_ratelimit_interval_ms),
2654 ATTR_LIST(warning_ratelimit_burst),
2655 ATTR_LIST(msg_ratelimit_interval_ms),
2656 ATTR_LIST(msg_ratelimit_burst),
2657 NULL,
2658 };
2659
2660 /* Features this copy of ext4 supports */
2661 EXT4_INFO_ATTR(lazy_itable_init);
2662 EXT4_INFO_ATTR(batched_discard);
2663 EXT4_INFO_ATTR(meta_bg_resize);
2664
2665 static struct attribute *ext4_feat_attrs[] = {
2666 ATTR_LIST(lazy_itable_init),
2667 ATTR_LIST(batched_discard),
2668 ATTR_LIST(meta_bg_resize),
2669 NULL,
2670 };
2671
2672 static ssize_t ext4_attr_show(struct kobject *kobj,
2673 struct attribute *attr, char *buf)
2674 {
2675 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2676 s_kobj);
2677 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2678
2679 return a->show ? a->show(a, sbi, buf) : 0;
2680 }
2681
2682 static ssize_t ext4_attr_store(struct kobject *kobj,
2683 struct attribute *attr,
2684 const char *buf, size_t len)
2685 {
2686 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2687 s_kobj);
2688 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2689
2690 return a->store ? a->store(a, sbi, buf, len) : 0;
2691 }
2692
2693 static void ext4_sb_release(struct kobject *kobj)
2694 {
2695 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2696 s_kobj);
2697 complete(&sbi->s_kobj_unregister);
2698 }
2699
2700 static const struct sysfs_ops ext4_attr_ops = {
2701 .show = ext4_attr_show,
2702 .store = ext4_attr_store,
2703 };
2704
2705 static struct kobj_type ext4_ktype = {
2706 .default_attrs = ext4_attrs,
2707 .sysfs_ops = &ext4_attr_ops,
2708 .release = ext4_sb_release,
2709 };
2710
2711 static void ext4_feat_release(struct kobject *kobj)
2712 {
2713 complete(&ext4_feat->f_kobj_unregister);
2714 }
2715
2716 static struct kobj_type ext4_feat_ktype = {
2717 .default_attrs = ext4_feat_attrs,
2718 .sysfs_ops = &ext4_attr_ops,
2719 .release = ext4_feat_release,
2720 };
2721
2722 /*
2723 * Check whether this filesystem can be mounted based on
2724 * the features present and the RDONLY/RDWR mount requested.
2725 * Returns 1 if this filesystem can be mounted as requested,
2726 * 0 if it cannot be.
2727 */
2728 static int ext4_feature_set_ok(struct super_block *sb, int readonly)
2729 {
2730 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP)) {
2731 ext4_msg(sb, KERN_ERR,
2732 "Couldn't mount because of "
2733 "unsupported optional features (%x)",
2734 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
2735 ~EXT4_FEATURE_INCOMPAT_SUPP));
2736 return 0;
2737 }
2738
2739 if (readonly)
2740 return 1;
2741
2742 /* Check that feature set is OK for a read-write mount */
2743 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP)) {
2744 ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of "
2745 "unsupported optional features (%x)",
2746 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
2747 ~EXT4_FEATURE_RO_COMPAT_SUPP));
2748 return 0;
2749 }
2750 /*
2751 * Large file size enabled file system can only be mounted
2752 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
2753 */
2754 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) {
2755 if (sizeof(blkcnt_t) < sizeof(u64)) {
2756 ext4_msg(sb, KERN_ERR, "Filesystem with huge files "
2757 "cannot be mounted RDWR without "
2758 "CONFIG_LBDAF");
2759 return 0;
2760 }
2761 }
2762 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_BIGALLOC) &&
2763 !EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS)) {
2764 ext4_msg(sb, KERN_ERR,
2765 "Can't support bigalloc feature without "
2766 "extents feature\n");
2767 return 0;
2768 }
2769
2770 #ifndef CONFIG_QUOTA
2771 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) &&
2772 !readonly) {
2773 ext4_msg(sb, KERN_ERR,
2774 "Filesystem with quota feature cannot be mounted RDWR "
2775 "without CONFIG_QUOTA");
2776 return 0;
2777 }
2778 #endif /* CONFIG_QUOTA */
2779 return 1;
2780 }
2781
2782 /*
2783 * This function is called once a day if we have errors logged
2784 * on the file system
2785 */
2786 static void print_daily_error_info(unsigned long arg)
2787 {
2788 struct super_block *sb = (struct super_block *) arg;
2789 struct ext4_sb_info *sbi;
2790 struct ext4_super_block *es;
2791
2792 sbi = EXT4_SB(sb);
2793 es = sbi->s_es;
2794
2795 if (es->s_error_count)
2796 ext4_msg(sb, KERN_NOTICE, "error count: %u",
2797 le32_to_cpu(es->s_error_count));
2798 if (es->s_first_error_time) {
2799 printk(KERN_NOTICE "EXT4-fs (%s): initial error at %u: %.*s:%d",
2800 sb->s_id, le32_to_cpu(es->s_first_error_time),
2801 (int) sizeof(es->s_first_error_func),
2802 es->s_first_error_func,
2803 le32_to_cpu(es->s_first_error_line));
2804 if (es->s_first_error_ino)
2805 printk(": inode %u",
2806 le32_to_cpu(es->s_first_error_ino));
2807 if (es->s_first_error_block)
2808 printk(": block %llu", (unsigned long long)
2809 le64_to_cpu(es->s_first_error_block));
2810 printk("\n");
2811 }
2812 if (es->s_last_error_time) {
2813 printk(KERN_NOTICE "EXT4-fs (%s): last error at %u: %.*s:%d",
2814 sb->s_id, le32_to_cpu(es->s_last_error_time),
2815 (int) sizeof(es->s_last_error_func),
2816 es->s_last_error_func,
2817 le32_to_cpu(es->s_last_error_line));
2818 if (es->s_last_error_ino)
2819 printk(": inode %u",
2820 le32_to_cpu(es->s_last_error_ino));
2821 if (es->s_last_error_block)
2822 printk(": block %llu", (unsigned long long)
2823 le64_to_cpu(es->s_last_error_block));
2824 printk("\n");
2825 }
2826 mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ); /* Once a day */
2827 }
2828
2829 /* Find next suitable group and run ext4_init_inode_table */
2830 static int ext4_run_li_request(struct ext4_li_request *elr)
2831 {
2832 struct ext4_group_desc *gdp = NULL;
2833 ext4_group_t group, ngroups;
2834 struct super_block *sb;
2835 unsigned long timeout = 0;
2836 int ret = 0;
2837
2838 sb = elr->lr_super;
2839 ngroups = EXT4_SB(sb)->s_groups_count;
2840
2841 sb_start_write(sb);
2842 for (group = elr->lr_next_group; group < ngroups; group++) {
2843 gdp = ext4_get_group_desc(sb, group, NULL);
2844 if (!gdp) {
2845 ret = 1;
2846 break;
2847 }
2848
2849 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2850 break;
2851 }
2852
2853 if (group >= ngroups)
2854 ret = 1;
2855
2856 if (!ret) {
2857 timeout = jiffies;
2858 ret = ext4_init_inode_table(sb, group,
2859 elr->lr_timeout ? 0 : 1);
2860 if (elr->lr_timeout == 0) {
2861 timeout = (jiffies - timeout) *
2862 elr->lr_sbi->s_li_wait_mult;
2863 elr->lr_timeout = timeout;
2864 }
2865 elr->lr_next_sched = jiffies + elr->lr_timeout;
2866 elr->lr_next_group = group + 1;
2867 }
2868 sb_end_write(sb);
2869
2870 return ret;
2871 }
2872
2873 /*
2874 * Remove lr_request from the list_request and free the
2875 * request structure. Should be called with li_list_mtx held
2876 */
2877 static void ext4_remove_li_request(struct ext4_li_request *elr)
2878 {
2879 struct ext4_sb_info *sbi;
2880
2881 if (!elr)
2882 return;
2883
2884 sbi = elr->lr_sbi;
2885
2886 list_del(&elr->lr_request);
2887 sbi->s_li_request = NULL;
2888 kfree(elr);
2889 }
2890
2891 static void ext4_unregister_li_request(struct super_block *sb)
2892 {
2893 mutex_lock(&ext4_li_mtx);
2894 if (!ext4_li_info) {
2895 mutex_unlock(&ext4_li_mtx);
2896 return;
2897 }
2898
2899 mutex_lock(&ext4_li_info->li_list_mtx);
2900 ext4_remove_li_request(EXT4_SB(sb)->s_li_request);
2901 mutex_unlock(&ext4_li_info->li_list_mtx);
2902 mutex_unlock(&ext4_li_mtx);
2903 }
2904
2905 static struct task_struct *ext4_lazyinit_task;
2906
2907 /*
2908 * This is the function where ext4lazyinit thread lives. It walks
2909 * through the request list searching for next scheduled filesystem.
2910 * When such a fs is found, run the lazy initialization request
2911 * (ext4_rn_li_request) and keep track of the time spend in this
2912 * function. Based on that time we compute next schedule time of
2913 * the request. When walking through the list is complete, compute
2914 * next waking time and put itself into sleep.
2915 */
2916 static int ext4_lazyinit_thread(void *arg)
2917 {
2918 struct ext4_lazy_init *eli = (struct ext4_lazy_init *)arg;
2919 struct list_head *pos, *n;
2920 struct ext4_li_request *elr;
2921 unsigned long next_wakeup, cur;
2922
2923 BUG_ON(NULL == eli);
2924
2925 cont_thread:
2926 while (true) {
2927 next_wakeup = MAX_JIFFY_OFFSET;
2928
2929 mutex_lock(&eli->li_list_mtx);
2930 if (list_empty(&eli->li_request_list)) {
2931 mutex_unlock(&eli->li_list_mtx);
2932 goto exit_thread;
2933 }
2934
2935 list_for_each_safe(pos, n, &eli->li_request_list) {
2936 elr = list_entry(pos, struct ext4_li_request,
2937 lr_request);
2938
2939 if (time_after_eq(jiffies, elr->lr_next_sched)) {
2940 if (ext4_run_li_request(elr) != 0) {
2941 /* error, remove the lazy_init job */
2942 ext4_remove_li_request(elr);
2943 continue;
2944 }
2945 }
2946
2947 if (time_before(elr->lr_next_sched, next_wakeup))
2948 next_wakeup = elr->lr_next_sched;
2949 }
2950 mutex_unlock(&eli->li_list_mtx);
2951
2952 try_to_freeze();
2953
2954 cur = jiffies;
2955 if ((time_after_eq(cur, next_wakeup)) ||
2956 (MAX_JIFFY_OFFSET == next_wakeup)) {
2957 cond_resched();
2958 continue;
2959 }
2960
2961 schedule_timeout_interruptible(next_wakeup - cur);
2962
2963 if (kthread_should_stop()) {
2964 ext4_clear_request_list();
2965 goto exit_thread;
2966 }
2967 }
2968
2969 exit_thread:
2970 /*
2971 * It looks like the request list is empty, but we need
2972 * to check it under the li_list_mtx lock, to prevent any
2973 * additions into it, and of course we should lock ext4_li_mtx
2974 * to atomically free the list and ext4_li_info, because at
2975 * this point another ext4 filesystem could be registering
2976 * new one.
2977 */
2978 mutex_lock(&ext4_li_mtx);
2979 mutex_lock(&eli->li_list_mtx);
2980 if (!list_empty(&eli->li_request_list)) {
2981 mutex_unlock(&eli->li_list_mtx);
2982 mutex_unlock(&ext4_li_mtx);
2983 goto cont_thread;
2984 }
2985 mutex_unlock(&eli->li_list_mtx);
2986 kfree(ext4_li_info);
2987 ext4_li_info = NULL;
2988 mutex_unlock(&ext4_li_mtx);
2989
2990 return 0;
2991 }
2992
2993 static void ext4_clear_request_list(void)
2994 {
2995 struct list_head *pos, *n;
2996 struct ext4_li_request *elr;
2997
2998 mutex_lock(&ext4_li_info->li_list_mtx);
2999 list_for_each_safe(pos, n, &ext4_li_info->li_request_list) {
3000 elr = list_entry(pos, struct ext4_li_request,
3001 lr_request);
3002 ext4_remove_li_request(elr);
3003 }
3004 mutex_unlock(&ext4_li_info->li_list_mtx);
3005 }
3006
3007 static int ext4_run_lazyinit_thread(void)
3008 {
3009 ext4_lazyinit_task = kthread_run(ext4_lazyinit_thread,
3010 ext4_li_info, "ext4lazyinit");
3011 if (IS_ERR(ext4_lazyinit_task)) {
3012 int err = PTR_ERR(ext4_lazyinit_task);
3013 ext4_clear_request_list();
3014 kfree(ext4_li_info);
3015 ext4_li_info = NULL;
3016 printk(KERN_CRIT "EXT4-fs: error %d creating inode table "
3017 "initialization thread\n",
3018 err);
3019 return err;
3020 }
3021 ext4_li_info->li_state |= EXT4_LAZYINIT_RUNNING;
3022 return 0;
3023 }
3024
3025 /*
3026 * Check whether it make sense to run itable init. thread or not.
3027 * If there is at least one uninitialized inode table, return
3028 * corresponding group number, else the loop goes through all
3029 * groups and return total number of groups.
3030 */
3031 static ext4_group_t ext4_has_uninit_itable(struct super_block *sb)
3032 {
3033 ext4_group_t group, ngroups = EXT4_SB(sb)->s_groups_count;
3034 struct ext4_group_desc *gdp = NULL;
3035
3036 for (group = 0; group < ngroups; group++) {
3037 gdp = ext4_get_group_desc(sb, group, NULL);
3038 if (!gdp)
3039 continue;
3040
3041 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
3042 break;
3043 }
3044
3045 return group;
3046 }
3047
3048 static int ext4_li_info_new(void)
3049 {
3050 struct ext4_lazy_init *eli = NULL;
3051
3052 eli = kzalloc(sizeof(*eli), GFP_KERNEL);
3053 if (!eli)
3054 return -ENOMEM;
3055
3056 INIT_LIST_HEAD(&eli->li_request_list);
3057 mutex_init(&eli->li_list_mtx);
3058
3059 eli->li_state |= EXT4_LAZYINIT_QUIT;
3060
3061 ext4_li_info = eli;
3062
3063 return 0;
3064 }
3065
3066 static struct ext4_li_request *ext4_li_request_new(struct super_block *sb,
3067 ext4_group_t start)
3068 {
3069 struct ext4_sb_info *sbi = EXT4_SB(sb);
3070 struct ext4_li_request *elr;
3071
3072 elr = kzalloc(sizeof(*elr), GFP_KERNEL);
3073 if (!elr)
3074 return NULL;
3075
3076 elr->lr_super = sb;
3077 elr->lr_sbi = sbi;
3078 elr->lr_next_group = start;
3079
3080 /*
3081 * Randomize first schedule time of the request to
3082 * spread the inode table initialization requests
3083 * better.
3084 */
3085 elr->lr_next_sched = jiffies + (prandom_u32() %
3086 (EXT4_DEF_LI_MAX_START_DELAY * HZ));
3087 return elr;
3088 }
3089
3090 int ext4_register_li_request(struct super_block *sb,
3091 ext4_group_t first_not_zeroed)
3092 {
3093 struct ext4_sb_info *sbi = EXT4_SB(sb);
3094 struct ext4_li_request *elr = NULL;
3095 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
3096 int ret = 0;
3097
3098 mutex_lock(&ext4_li_mtx);
3099 if (sbi->s_li_request != NULL) {
3100 /*
3101 * Reset timeout so it can be computed again, because
3102 * s_li_wait_mult might have changed.
3103 */
3104 sbi->s_li_request->lr_timeout = 0;
3105 goto out;
3106 }
3107
3108 if (first_not_zeroed == ngroups ||
3109 (sb->s_flags & MS_RDONLY) ||
3110 !test_opt(sb, INIT_INODE_TABLE))
3111 goto out;
3112
3113 elr = ext4_li_request_new(sb, first_not_zeroed);
3114 if (!elr) {
3115 ret = -ENOMEM;
3116 goto out;
3117 }
3118
3119 if (NULL == ext4_li_info) {
3120 ret = ext4_li_info_new();
3121 if (ret)
3122 goto out;
3123 }
3124
3125 mutex_lock(&ext4_li_info->li_list_mtx);
3126 list_add(&elr->lr_request, &ext4_li_info->li_request_list);
3127 mutex_unlock(&ext4_li_info->li_list_mtx);
3128
3129 sbi->s_li_request = elr;
3130 /*
3131 * set elr to NULL here since it has been inserted to
3132 * the request_list and the removal and free of it is
3133 * handled by ext4_clear_request_list from now on.
3134 */
3135 elr = NULL;
3136
3137 if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) {
3138 ret = ext4_run_lazyinit_thread();
3139 if (ret)
3140 goto out;
3141 }
3142 out:
3143 mutex_unlock(&ext4_li_mtx);
3144 if (ret)
3145 kfree(elr);
3146 return ret;
3147 }
3148
3149 /*
3150 * We do not need to lock anything since this is called on
3151 * module unload.
3152 */
3153 static void ext4_destroy_lazyinit_thread(void)
3154 {
3155 /*
3156 * If thread exited earlier
3157 * there's nothing to be done.
3158 */
3159 if (!ext4_li_info || !ext4_lazyinit_task)
3160 return;
3161
3162 kthread_stop(ext4_lazyinit_task);
3163 }
3164
3165 static int set_journal_csum_feature_set(struct super_block *sb)
3166 {
3167 int ret = 1;
3168 int compat, incompat;
3169 struct ext4_sb_info *sbi = EXT4_SB(sb);
3170
3171 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3172 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) {
3173 /* journal checksum v2 */
3174 compat = 0;
3175 incompat = JBD2_FEATURE_INCOMPAT_CSUM_V2;
3176 } else {
3177 /* journal checksum v1 */
3178 compat = JBD2_FEATURE_COMPAT_CHECKSUM;
3179 incompat = 0;
3180 }
3181
3182 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
3183 ret = jbd2_journal_set_features(sbi->s_journal,
3184 compat, 0,
3185 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT |
3186 incompat);
3187 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
3188 ret = jbd2_journal_set_features(sbi->s_journal,
3189 compat, 0,
3190 incompat);
3191 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
3192 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
3193 } else {
3194 jbd2_journal_clear_features(sbi->s_journal,
3195 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
3196 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT |
3197 JBD2_FEATURE_INCOMPAT_CSUM_V2);
3198 }
3199
3200 return ret;
3201 }
3202
3203 /*
3204 * Note: calculating the overhead so we can be compatible with
3205 * historical BSD practice is quite difficult in the face of
3206 * clusters/bigalloc. This is because multiple metadata blocks from
3207 * different block group can end up in the same allocation cluster.
3208 * Calculating the exact overhead in the face of clustered allocation
3209 * requires either O(all block bitmaps) in memory or O(number of block
3210 * groups**2) in time. We will still calculate the superblock for
3211 * older file systems --- and if we come across with a bigalloc file
3212 * system with zero in s_overhead_clusters the estimate will be close to
3213 * correct especially for very large cluster sizes --- but for newer
3214 * file systems, it's better to calculate this figure once at mkfs
3215 * time, and store it in the superblock. If the superblock value is
3216 * present (even for non-bigalloc file systems), we will use it.
3217 */
3218 static int count_overhead(struct super_block *sb, ext4_group_t grp,
3219 char *buf)
3220 {
3221 struct ext4_sb_info *sbi = EXT4_SB(sb);
3222 struct ext4_group_desc *gdp;
3223 ext4_fsblk_t first_block, last_block, b;
3224 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3225 int s, j, count = 0;
3226
3227 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_BIGALLOC))
3228 return (ext4_bg_has_super(sb, grp) + ext4_bg_num_gdb(sb, grp) +
3229 sbi->s_itb_per_group + 2);
3230
3231 first_block = le32_to_cpu(sbi->s_es->s_first_data_block) +
3232 (grp * EXT4_BLOCKS_PER_GROUP(sb));
3233 last_block = first_block + EXT4_BLOCKS_PER_GROUP(sb) - 1;
3234 for (i = 0; i < ngroups; i++) {
3235 gdp = ext4_get_group_desc(sb, i, NULL);
3236 b = ext4_block_bitmap(sb, gdp);
3237 if (b >= first_block && b <= last_block) {
3238 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3239 count++;
3240 }
3241 b = ext4_inode_bitmap(sb, gdp);
3242 if (b >= first_block && b <= last_block) {
3243 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3244 count++;
3245 }
3246 b = ext4_inode_table(sb, gdp);
3247 if (b >= first_block && b + sbi->s_itb_per_group <= last_block)
3248 for (j = 0; j < sbi->s_itb_per_group; j++, b++) {
3249 int c = EXT4_B2C(sbi, b - first_block);
3250 ext4_set_bit(c, buf);
3251 count++;
3252 }
3253 if (i != grp)
3254 continue;
3255 s = 0;
3256 if (ext4_bg_has_super(sb, grp)) {
3257 ext4_set_bit(s++, buf);
3258 count++;
3259 }
3260 for (j = ext4_bg_num_gdb(sb, grp); j > 0; j--) {
3261 ext4_set_bit(EXT4_B2C(sbi, s++), buf);
3262 count++;
3263 }
3264 }
3265 if (!count)
3266 return 0;
3267 return EXT4_CLUSTERS_PER_GROUP(sb) -
3268 ext4_count_free(buf, EXT4_CLUSTERS_PER_GROUP(sb) / 8);
3269 }
3270
3271 /*
3272 * Compute the overhead and stash it in sbi->s_overhead
3273 */
3274 int ext4_calculate_overhead(struct super_block *sb)
3275 {
3276 struct ext4_sb_info *sbi = EXT4_SB(sb);
3277 struct ext4_super_block *es = sbi->s_es;
3278 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3279 ext4_fsblk_t overhead = 0;
3280 char *buf = (char *) get_zeroed_page(GFP_KERNEL);
3281
3282 if (!buf)
3283 return -ENOMEM;
3284
3285 /*
3286 * Compute the overhead (FS structures). This is constant
3287 * for a given filesystem unless the number of block groups
3288 * changes so we cache the previous value until it does.
3289 */
3290
3291 /*
3292 * All of the blocks before first_data_block are overhead
3293 */
3294 overhead = EXT4_B2C(sbi, le32_to_cpu(es->s_first_data_block));
3295
3296 /*
3297 * Add the overhead found in each block group
3298 */
3299 for (i = 0; i < ngroups; i++) {
3300 int blks;
3301
3302 blks = count_overhead(sb, i, buf);
3303 overhead += blks;
3304 if (blks)
3305 memset(buf, 0, PAGE_SIZE);
3306 cond_resched();
3307 }
3308 /* Add the journal blocks as well */
3309 if (sbi->s_journal)
3310 overhead += EXT4_NUM_B2C(sbi, sbi->s_journal->j_maxlen);
3311
3312 sbi->s_overhead = overhead;
3313 smp_wmb();
3314 free_page((unsigned long) buf);
3315 return 0;
3316 }
3317
3318
3319 static ext4_fsblk_t ext4_calculate_resv_clusters(struct ext4_sb_info *sbi)
3320 {
3321 ext4_fsblk_t resv_clusters;
3322
3323 /*
3324 * By default we reserve 2% or 4096 clusters, whichever is smaller.
3325 * This should cover the situations where we can not afford to run
3326 * out of space like for example punch hole, or converting
3327 * uninitialized extents in delalloc path. In most cases such
3328 * allocation would require 1, or 2 blocks, higher numbers are
3329 * very rare.
3330 */
3331 resv_clusters = ext4_blocks_count(sbi->s_es) >> sbi->s_cluster_bits;
3332
3333 do_div(resv_clusters, 50);
3334 resv_clusters = min_t(ext4_fsblk_t, resv_clusters, 4096);
3335
3336 return resv_clusters;
3337 }
3338
3339
3340 static int ext4_reserve_clusters(struct ext4_sb_info *sbi, ext4_fsblk_t count)
3341 {
3342 ext4_fsblk_t clusters = ext4_blocks_count(sbi->s_es) >>
3343 sbi->s_cluster_bits;
3344
3345 if (count >= clusters)
3346 return -EINVAL;
3347
3348 atomic64_set(&sbi->s_resv_clusters, count);
3349 return 0;
3350 }
3351
3352 static int ext4_fill_super(struct super_block *sb, void *data, int silent)
3353 {
3354 char *orig_data = kstrdup(data, GFP_KERNEL);
3355 struct buffer_head *bh;
3356 struct ext4_super_block *es = NULL;
3357 struct ext4_sb_info *sbi;
3358 ext4_fsblk_t block;
3359 ext4_fsblk_t sb_block = get_sb_block(&data);
3360 ext4_fsblk_t logical_sb_block;
3361 unsigned long offset = 0;
3362 unsigned long journal_devnum = 0;
3363 unsigned long def_mount_opts;
3364 struct inode *root;
3365 char *cp;
3366 const char *descr;
3367 int ret = -ENOMEM;
3368 int blocksize, clustersize;
3369 unsigned int db_count;
3370 unsigned int i;
3371 int needs_recovery, has_huge_files, has_bigalloc;
3372 __u64 blocks_count;
3373 int err = 0;
3374 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
3375 ext4_group_t first_not_zeroed;
3376
3377 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
3378 if (!sbi)
3379 goto out_free_orig;
3380
3381 sbi->s_blockgroup_lock =
3382 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
3383 if (!sbi->s_blockgroup_lock) {
3384 kfree(sbi);
3385 goto out_free_orig;
3386 }
3387 sb->s_fs_info = sbi;
3388 sbi->s_sb = sb;
3389 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
3390 sbi->s_sb_block = sb_block;
3391 if (sb->s_bdev->bd_part)
3392 sbi->s_sectors_written_start =
3393 part_stat_read(sb->s_bdev->bd_part, sectors[1]);
3394
3395 /* Cleanup superblock name */
3396 for (cp = sb->s_id; (cp = strchr(cp, '/'));)
3397 *cp = '!';
3398
3399 /* -EINVAL is default */
3400 ret = -EINVAL;
3401 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
3402 if (!blocksize) {
3403 ext4_msg(sb, KERN_ERR, "unable to set blocksize");
3404 goto out_fail;
3405 }
3406
3407 /*
3408 * The ext4 superblock will not be buffer aligned for other than 1kB
3409 * block sizes. We need to calculate the offset from buffer start.
3410 */
3411 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
3412 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3413 offset = do_div(logical_sb_block, blocksize);
3414 } else {
3415 logical_sb_block = sb_block;
3416 }
3417
3418 if (!(bh = sb_bread(sb, logical_sb_block))) {
3419 ext4_msg(sb, KERN_ERR, "unable to read superblock");
3420 goto out_fail;
3421 }
3422 /*
3423 * Note: s_es must be initialized as soon as possible because
3424 * some ext4 macro-instructions depend on its value
3425 */
3426 es = (struct ext4_super_block *) (bh->b_data + offset);
3427 sbi->s_es = es;
3428 sb->s_magic = le16_to_cpu(es->s_magic);
3429 if (sb->s_magic != EXT4_SUPER_MAGIC)
3430 goto cantfind_ext4;
3431 sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
3432
3433 /* Warn if metadata_csum and gdt_csum are both set. */
3434 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3435 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) &&
3436 EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_GDT_CSUM))
3437 ext4_warning(sb, KERN_INFO "metadata_csum and uninit_bg are "
3438 "redundant flags; please run fsck.");
3439
3440 /* Check for a known checksum algorithm */
3441 if (!ext4_verify_csum_type(sb, es)) {
3442 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3443 "unknown checksum algorithm.");
3444 silent = 1;
3445 goto cantfind_ext4;
3446 }
3447
3448 /* Load the checksum driver */
3449 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3450 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) {
3451 sbi->s_chksum_driver = crypto_alloc_shash("crc32c", 0, 0);
3452 if (IS_ERR(sbi->s_chksum_driver)) {
3453 ext4_msg(sb, KERN_ERR, "Cannot load crc32c driver.");
3454 ret = PTR_ERR(sbi->s_chksum_driver);
3455 sbi->s_chksum_driver = NULL;
3456 goto failed_mount;
3457 }
3458 }
3459
3460 /* Check superblock checksum */
3461 if (!ext4_superblock_csum_verify(sb, es)) {
3462 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3463 "invalid superblock checksum. Run e2fsck?");
3464 silent = 1;
3465 goto cantfind_ext4;
3466 }
3467
3468 /* Precompute checksum seed for all metadata */
3469 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3470 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
3471 sbi->s_csum_seed = ext4_chksum(sbi, ~0, es->s_uuid,
3472 sizeof(es->s_uuid));
3473
3474 /* Set defaults before we parse the mount options */
3475 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
3476 set_opt(sb, INIT_INODE_TABLE);
3477 if (def_mount_opts & EXT4_DEFM_DEBUG)
3478 set_opt(sb, DEBUG);
3479 if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
3480 set_opt(sb, GRPID);
3481 if (def_mount_opts & EXT4_DEFM_UID16)
3482 set_opt(sb, NO_UID32);
3483 /* xattr user namespace & acls are now defaulted on */
3484 set_opt(sb, XATTR_USER);
3485 #ifdef CONFIG_EXT4_FS_POSIX_ACL
3486 set_opt(sb, POSIX_ACL);
3487 #endif
3488 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
3489 set_opt(sb, JOURNAL_DATA);
3490 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
3491 set_opt(sb, ORDERED_DATA);
3492 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
3493 set_opt(sb, WRITEBACK_DATA);
3494
3495 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
3496 set_opt(sb, ERRORS_PANIC);
3497 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
3498 set_opt(sb, ERRORS_CONT);
3499 else
3500 set_opt(sb, ERRORS_RO);
3501 if (def_mount_opts & EXT4_DEFM_BLOCK_VALIDITY)
3502 set_opt(sb, BLOCK_VALIDITY);
3503 if (def_mount_opts & EXT4_DEFM_DISCARD)
3504 set_opt(sb, DISCARD);
3505
3506 sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));
3507 sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid));
3508 sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
3509 sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
3510 sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
3511
3512 if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0)
3513 set_opt(sb, BARRIER);
3514
3515 /*
3516 * enable delayed allocation by default
3517 * Use -o nodelalloc to turn it off
3518 */
3519 if (!IS_EXT3_SB(sb) && !IS_EXT2_SB(sb) &&
3520 ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0))
3521 set_opt(sb, DELALLOC);
3522
3523 /*
3524 * set default s_li_wait_mult for lazyinit, for the case there is
3525 * no mount option specified.
3526 */
3527 sbi->s_li_wait_mult = EXT4_DEF_LI_WAIT_MULT;
3528
3529 if (!parse_options((char *) sbi->s_es->s_mount_opts, sb,
3530 &journal_devnum, &journal_ioprio, 0)) {
3531 ext4_msg(sb, KERN_WARNING,
3532 "failed to parse options in superblock: %s",
3533 sbi->s_es->s_mount_opts);
3534 }
3535 sbi->s_def_mount_opt = sbi->s_mount_opt;
3536 if (!parse_options((char *) data, sb, &journal_devnum,
3537 &journal_ioprio, 0))
3538 goto failed_mount;
3539
3540 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
3541 printk_once(KERN_WARNING "EXT4-fs: Warning: mounting "
3542 "with data=journal disables delayed "
3543 "allocation and O_DIRECT support!\n");
3544 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
3545 ext4_msg(sb, KERN_ERR, "can't mount with "
3546 "both data=journal and delalloc");
3547 goto failed_mount;
3548 }
3549 if (test_opt(sb, DIOREAD_NOLOCK)) {
3550 ext4_msg(sb, KERN_ERR, "can't mount with "
3551 "both data=journal and dioread_nolock");
3552 goto failed_mount;
3553 }
3554 if (test_opt(sb, DELALLOC))
3555 clear_opt(sb, DELALLOC);
3556 }
3557
3558 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
3559 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
3560
3561 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
3562 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
3563 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
3564 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
3565 ext4_msg(sb, KERN_WARNING,
3566 "feature flags set on rev 0 fs, "
3567 "running e2fsck is recommended");
3568
3569 if (IS_EXT2_SB(sb)) {
3570 if (ext2_feature_set_ok(sb))
3571 ext4_msg(sb, KERN_INFO, "mounting ext2 file system "
3572 "using the ext4 subsystem");
3573 else {
3574 ext4_msg(sb, KERN_ERR, "couldn't mount as ext2 due "
3575 "to feature incompatibilities");
3576 goto failed_mount;
3577 }
3578 }
3579
3580 if (IS_EXT3_SB(sb)) {
3581 if (ext3_feature_set_ok(sb))
3582 ext4_msg(sb, KERN_INFO, "mounting ext3 file system "
3583 "using the ext4 subsystem");
3584 else {
3585 ext4_msg(sb, KERN_ERR, "couldn't mount as ext3 due "
3586 "to feature incompatibilities");
3587 goto failed_mount;
3588 }
3589 }
3590
3591 /*
3592 * Check feature flags regardless of the revision level, since we
3593 * previously didn't change the revision level when setting the flags,
3594 * so there is a chance incompat flags are set on a rev 0 filesystem.
3595 */
3596 if (!ext4_feature_set_ok(sb, (sb->s_flags & MS_RDONLY)))
3597 goto failed_mount;
3598
3599 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
3600 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
3601 blocksize > EXT4_MAX_BLOCK_SIZE) {
3602 ext4_msg(sb, KERN_ERR,
3603 "Unsupported filesystem blocksize %d", blocksize);
3604 goto failed_mount;
3605 }
3606
3607 if (sb->s_blocksize != blocksize) {
3608 /* Validate the filesystem blocksize */
3609 if (!sb_set_blocksize(sb, blocksize)) {
3610 ext4_msg(sb, KERN_ERR, "bad block size %d",
3611 blocksize);
3612 goto failed_mount;
3613 }
3614
3615 brelse(bh);
3616 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3617 offset = do_div(logical_sb_block, blocksize);
3618 bh = sb_bread(sb, logical_sb_block);
3619 if (!bh) {
3620 ext4_msg(sb, KERN_ERR,
3621 "Can't read superblock on 2nd try");
3622 goto failed_mount;
3623 }
3624 es = (struct ext4_super_block *)(bh->b_data + offset);
3625 sbi->s_es = es;
3626 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
3627 ext4_msg(sb, KERN_ERR,
3628 "Magic mismatch, very weird!");
3629 goto failed_mount;
3630 }
3631 }
3632
3633 has_huge_files = EXT4_HAS_RO_COMPAT_FEATURE(sb,
3634 EXT4_FEATURE_RO_COMPAT_HUGE_FILE);
3635 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
3636 has_huge_files);
3637 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
3638
3639 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
3640 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
3641 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
3642 } else {
3643 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
3644 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
3645 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
3646 (!is_power_of_2(sbi->s_inode_size)) ||
3647 (sbi->s_inode_size > blocksize)) {
3648 ext4_msg(sb, KERN_ERR,
3649 "unsupported inode size: %d",
3650 sbi->s_inode_size);
3651 goto failed_mount;
3652 }
3653 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
3654 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
3655 }
3656
3657 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
3658 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
3659 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
3660 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
3661 !is_power_of_2(sbi->s_desc_size)) {
3662 ext4_msg(sb, KERN_ERR,
3663 "unsupported descriptor size %lu",
3664 sbi->s_desc_size);
3665 goto failed_mount;
3666 }
3667 } else
3668 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
3669
3670 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
3671 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
3672 if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
3673 goto cantfind_ext4;
3674
3675 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
3676 if (sbi->s_inodes_per_block == 0)
3677 goto cantfind_ext4;
3678 sbi->s_itb_per_group = sbi->s_inodes_per_group /
3679 sbi->s_inodes_per_block;
3680 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
3681 sbi->s_sbh = bh;
3682 sbi->s_mount_state = le16_to_cpu(es->s_state);
3683 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
3684 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
3685
3686 for (i = 0; i < 4; i++)
3687 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
3688 sbi->s_def_hash_version = es->s_def_hash_version;
3689 i = le32_to_cpu(es->s_flags);
3690 if (i & EXT2_FLAGS_UNSIGNED_HASH)
3691 sbi->s_hash_unsigned = 3;
3692 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
3693 #ifdef __CHAR_UNSIGNED__
3694 es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
3695 sbi->s_hash_unsigned = 3;
3696 #else
3697 es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
3698 #endif
3699 }
3700
3701 /* Handle clustersize */
3702 clustersize = BLOCK_SIZE << le32_to_cpu(es->s_log_cluster_size);
3703 has_bigalloc = EXT4_HAS_RO_COMPAT_FEATURE(sb,
3704 EXT4_FEATURE_RO_COMPAT_BIGALLOC);
3705 if (has_bigalloc) {
3706 if (clustersize < blocksize) {
3707 ext4_msg(sb, KERN_ERR,
3708 "cluster size (%d) smaller than "
3709 "block size (%d)", clustersize, blocksize);
3710 goto failed_mount;
3711 }
3712 sbi->s_cluster_bits = le32_to_cpu(es->s_log_cluster_size) -
3713 le32_to_cpu(es->s_log_block_size);
3714 sbi->s_clusters_per_group =
3715 le32_to_cpu(es->s_clusters_per_group);
3716 if (sbi->s_clusters_per_group > blocksize * 8) {
3717 ext4_msg(sb, KERN_ERR,
3718 "#clusters per group too big: %lu",
3719 sbi->s_clusters_per_group);
3720 goto failed_mount;
3721 }
3722 if (sbi->s_blocks_per_group !=
3723 (sbi->s_clusters_per_group * (clustersize / blocksize))) {
3724 ext4_msg(sb, KERN_ERR, "blocks per group (%lu) and "
3725 "clusters per group (%lu) inconsistent",
3726 sbi->s_blocks_per_group,
3727 sbi->s_clusters_per_group);
3728 goto failed_mount;
3729 }
3730 } else {
3731 if (clustersize != blocksize) {
3732 ext4_warning(sb, "fragment/cluster size (%d) != "
3733 "block size (%d)", clustersize,
3734 blocksize);
3735 clustersize = blocksize;
3736 }
3737 if (sbi->s_blocks_per_group > blocksize * 8) {
3738 ext4_msg(sb, KERN_ERR,
3739 "#blocks per group too big: %lu",
3740 sbi->s_blocks_per_group);
3741 goto failed_mount;
3742 }
3743 sbi->s_clusters_per_group = sbi->s_blocks_per_group;
3744 sbi->s_cluster_bits = 0;
3745 }
3746 sbi->s_cluster_ratio = clustersize / blocksize;
3747
3748 if (sbi->s_inodes_per_group > blocksize * 8) {
3749 ext4_msg(sb, KERN_ERR,
3750 "#inodes per group too big: %lu",
3751 sbi->s_inodes_per_group);
3752 goto failed_mount;
3753 }
3754
3755 /* Do we have standard group size of clustersize * 8 blocks ? */
3756 if (sbi->s_blocks_per_group == clustersize << 3)
3757 set_opt2(sb, STD_GROUP_SIZE);
3758
3759 /*
3760 * Test whether we have more sectors than will fit in sector_t,
3761 * and whether the max offset is addressable by the page cache.
3762 */
3763 err = generic_check_addressable(sb->s_blocksize_bits,
3764 ext4_blocks_count(es));
3765 if (err) {
3766 ext4_msg(sb, KERN_ERR, "filesystem"
3767 " too large to mount safely on this system");
3768 if (sizeof(sector_t) < 8)
3769 ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled");
3770 goto failed_mount;
3771 }
3772
3773 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
3774 goto cantfind_ext4;
3775
3776 /* check blocks count against device size */
3777 blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
3778 if (blocks_count && ext4_blocks_count(es) > blocks_count) {
3779 ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
3780 "exceeds size of device (%llu blocks)",
3781 ext4_blocks_count(es), blocks_count);
3782 goto failed_mount;
3783 }
3784
3785 /*
3786 * It makes no sense for the first data block to be beyond the end
3787 * of the filesystem.
3788 */
3789 if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
3790 ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
3791 "block %u is beyond end of filesystem (%llu)",
3792 le32_to_cpu(es->s_first_data_block),
3793 ext4_blocks_count(es));
3794 goto failed_mount;
3795 }
3796 blocks_count = (ext4_blocks_count(es) -
3797 le32_to_cpu(es->s_first_data_block) +
3798 EXT4_BLOCKS_PER_GROUP(sb) - 1);
3799 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
3800 if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
3801 ext4_msg(sb, KERN_WARNING, "groups count too large: %u "
3802 "(block count %llu, first data block %u, "
3803 "blocks per group %lu)", sbi->s_groups_count,
3804 ext4_blocks_count(es),
3805 le32_to_cpu(es->s_first_data_block),
3806 EXT4_BLOCKS_PER_GROUP(sb));
3807 goto failed_mount;
3808 }
3809 sbi->s_groups_count = blocks_count;
3810 sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
3811 (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
3812 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
3813 EXT4_DESC_PER_BLOCK(sb);
3814 sbi->s_group_desc = ext4_kvmalloc(db_count *
3815 sizeof(struct buffer_head *),
3816 GFP_KERNEL);
3817 if (sbi->s_group_desc == NULL) {
3818 ext4_msg(sb, KERN_ERR, "not enough memory");
3819 ret = -ENOMEM;
3820 goto failed_mount;
3821 }
3822
3823 if (ext4_proc_root)
3824 sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);
3825
3826 if (sbi->s_proc)
3827 proc_create_data("options", S_IRUGO, sbi->s_proc,
3828 &ext4_seq_options_fops, sb);
3829
3830 bgl_lock_init(sbi->s_blockgroup_lock);
3831
3832 for (i = 0; i < db_count; i++) {
3833 block = descriptor_loc(sb, logical_sb_block, i);
3834 sbi->s_group_desc[i] = sb_bread(sb, block);
3835 if (!sbi->s_group_desc[i]) {
3836 ext4_msg(sb, KERN_ERR,
3837 "can't read group descriptor %d", i);
3838 db_count = i;
3839 goto failed_mount2;
3840 }
3841 }
3842 if (!ext4_check_descriptors(sb, &first_not_zeroed)) {
3843 ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
3844 goto failed_mount2;
3845 }
3846 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
3847 if (!ext4_fill_flex_info(sb)) {
3848 ext4_msg(sb, KERN_ERR,
3849 "unable to initialize "
3850 "flex_bg meta info!");
3851 goto failed_mount2;
3852 }
3853
3854 sbi->s_gdb_count = db_count;
3855 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
3856 spin_lock_init(&sbi->s_next_gen_lock);
3857
3858 init_timer(&sbi->s_err_report);
3859 sbi->s_err_report.function = print_daily_error_info;
3860 sbi->s_err_report.data = (unsigned long) sb;
3861
3862 /* Register extent status tree shrinker */
3863 ext4_es_register_shrinker(sbi);
3864
3865 err = percpu_counter_init(&sbi->s_freeclusters_counter,
3866 ext4_count_free_clusters(sb));
3867 if (!err) {
3868 err = percpu_counter_init(&sbi->s_freeinodes_counter,
3869 ext4_count_free_inodes(sb));
3870 }
3871 if (!err) {
3872 err = percpu_counter_init(&sbi->s_dirs_counter,
3873 ext4_count_dirs(sb));
3874 }
3875 if (!err) {
3876 err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0);
3877 }
3878 if (!err) {
3879 err = percpu_counter_init(&sbi->s_extent_cache_cnt, 0);
3880 }
3881 if (err) {
3882 ext4_msg(sb, KERN_ERR, "insufficient memory");
3883 goto failed_mount3;
3884 }
3885
3886 sbi->s_stripe = ext4_get_stripe_size(sbi);
3887 sbi->s_extent_max_zeroout_kb = 32;
3888
3889 /*
3890 * set up enough so that it can read an inode
3891 */
3892 if (!test_opt(sb, NOLOAD) &&
3893 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
3894 sb->s_op = &ext4_sops;
3895 else
3896 sb->s_op = &ext4_nojournal_sops;
3897 sb->s_export_op = &ext4_export_ops;
3898 sb->s_xattr = ext4_xattr_handlers;
3899 #ifdef CONFIG_QUOTA
3900 sb->dq_op = &ext4_quota_operations;
3901 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA))
3902 sb->s_qcop = &ext4_qctl_sysfile_operations;
3903 else
3904 sb->s_qcop = &ext4_qctl_operations;
3905 #endif
3906 memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
3907
3908 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
3909 mutex_init(&sbi->s_orphan_lock);
3910
3911 sb->s_root = NULL;
3912
3913 needs_recovery = (es->s_last_orphan != 0 ||
3914 EXT4_HAS_INCOMPAT_FEATURE(sb,
3915 EXT4_FEATURE_INCOMPAT_RECOVER));
3916
3917 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_MMP) &&
3918 !(sb->s_flags & MS_RDONLY))
3919 if (ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block)))
3920 goto failed_mount3;
3921
3922 /*
3923 * The first inode we look at is the journal inode. Don't try
3924 * root first: it may be modified in the journal!
3925 */
3926 if (!test_opt(sb, NOLOAD) &&
3927 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
3928 if (ext4_load_journal(sb, es, journal_devnum))
3929 goto failed_mount3;
3930 } else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) &&
3931 EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
3932 ext4_msg(sb, KERN_ERR, "required journal recovery "
3933 "suppressed and not mounted read-only");
3934 goto failed_mount_wq;
3935 } else {
3936 clear_opt(sb, DATA_FLAGS);
3937 sbi->s_journal = NULL;
3938 needs_recovery = 0;
3939 goto no_journal;
3940 }
3941
3942 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT) &&
3943 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
3944 JBD2_FEATURE_INCOMPAT_64BIT)) {
3945 ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
3946 goto failed_mount_wq;
3947 }
3948
3949 if (!set_journal_csum_feature_set(sb)) {
3950 ext4_msg(sb, KERN_ERR, "Failed to set journal checksum "
3951 "feature set");
3952 goto failed_mount_wq;
3953 }
3954
3955 /* We have now updated the journal if required, so we can
3956 * validate the data journaling mode. */
3957 switch (test_opt(sb, DATA_FLAGS)) {
3958 case 0:
3959 /* No mode set, assume a default based on the journal
3960 * capabilities: ORDERED_DATA if the journal can
3961 * cope, else JOURNAL_DATA
3962 */
3963 if (jbd2_journal_check_available_features
3964 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
3965 set_opt(sb, ORDERED_DATA);
3966 else
3967 set_opt(sb, JOURNAL_DATA);
3968 break;
3969
3970 case EXT4_MOUNT_ORDERED_DATA:
3971 case EXT4_MOUNT_WRITEBACK_DATA:
3972 if (!jbd2_journal_check_available_features
3973 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
3974 ext4_msg(sb, KERN_ERR, "Journal does not support "
3975 "requested data journaling mode");
3976 goto failed_mount_wq;
3977 }
3978 default:
3979 break;
3980 }
3981 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
3982
3983 sbi->s_journal->j_commit_callback = ext4_journal_commit_callback;
3984
3985 /*
3986 * The journal may have updated the bg summary counts, so we
3987 * need to update the global counters.
3988 */
3989 percpu_counter_set(&sbi->s_freeclusters_counter,
3990 ext4_count_free_clusters(sb));
3991 percpu_counter_set(&sbi->s_freeinodes_counter,
3992 ext4_count_free_inodes(sb));
3993 percpu_counter_set(&sbi->s_dirs_counter,
3994 ext4_count_dirs(sb));
3995 percpu_counter_set(&sbi->s_dirtyclusters_counter, 0);
3996
3997 no_journal:
3998 /*
3999 * Get the # of file system overhead blocks from the
4000 * superblock if present.
4001 */
4002 if (es->s_overhead_clusters)
4003 sbi->s_overhead = le32_to_cpu(es->s_overhead_clusters);
4004 else {
4005 err = ext4_calculate_overhead(sb);
4006 if (err)
4007 goto failed_mount_wq;
4008 }
4009
4010 /*
4011 * The maximum number of concurrent works can be high and
4012 * concurrency isn't really necessary. Limit it to 1.
4013 */
4014 EXT4_SB(sb)->rsv_conversion_wq =
4015 alloc_workqueue("ext4-rsv-conversion", WQ_MEM_RECLAIM | WQ_UNBOUND, 1);
4016 if (!EXT4_SB(sb)->rsv_conversion_wq) {
4017 printk(KERN_ERR "EXT4-fs: failed to create workqueue\n");
4018 ret = -ENOMEM;
4019 goto failed_mount4;
4020 }
4021
4022 /*
4023 * The jbd2_journal_load will have done any necessary log recovery,
4024 * so we can safely mount the rest of the filesystem now.
4025 */
4026
4027 root = ext4_iget(sb, EXT4_ROOT_INO);
4028 if (IS_ERR(root)) {
4029 ext4_msg(sb, KERN_ERR, "get root inode failed");
4030 ret = PTR_ERR(root);
4031 root = NULL;
4032 goto failed_mount4;
4033 }
4034 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
4035 ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
4036 iput(root);
4037 goto failed_mount4;
4038 }
4039 sb->s_root = d_make_root(root);
4040 if (!sb->s_root) {
4041 ext4_msg(sb, KERN_ERR, "get root dentry failed");
4042 ret = -ENOMEM;
4043 goto failed_mount4;
4044 }
4045
4046 if (ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY))
4047 sb->s_flags |= MS_RDONLY;
4048
4049 /* determine the minimum size of new large inodes, if present */
4050 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
4051 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
4052 EXT4_GOOD_OLD_INODE_SIZE;
4053 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
4054 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) {
4055 if (sbi->s_want_extra_isize <
4056 le16_to_cpu(es->s_want_extra_isize))
4057 sbi->s_want_extra_isize =
4058 le16_to_cpu(es->s_want_extra_isize);
4059 if (sbi->s_want_extra_isize <
4060 le16_to_cpu(es->s_min_extra_isize))
4061 sbi->s_want_extra_isize =
4062 le16_to_cpu(es->s_min_extra_isize);
4063 }
4064 }
4065 /* Check if enough inode space is available */
4066 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
4067 sbi->s_inode_size) {
4068 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
4069 EXT4_GOOD_OLD_INODE_SIZE;
4070 ext4_msg(sb, KERN_INFO, "required extra inode space not"
4071 "available");
4072 }
4073
4074 err = ext4_reserve_clusters(sbi, ext4_calculate_resv_clusters(sbi));
4075 if (err) {
4076 ext4_msg(sb, KERN_ERR, "failed to reserve %llu clusters for "
4077 "reserved pool", ext4_calculate_resv_clusters(sbi));
4078 goto failed_mount4a;
4079 }
4080
4081 err = ext4_setup_system_zone(sb);
4082 if (err) {
4083 ext4_msg(sb, KERN_ERR, "failed to initialize system "
4084 "zone (%d)", err);
4085 goto failed_mount4a;
4086 }
4087
4088 ext4_ext_init(sb);
4089 err = ext4_mb_init(sb);
4090 if (err) {
4091 ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)",
4092 err);
4093 goto failed_mount5;
4094 }
4095
4096 err = ext4_register_li_request(sb, first_not_zeroed);
4097 if (err)
4098 goto failed_mount6;
4099
4100 sbi->s_kobj.kset = ext4_kset;
4101 init_completion(&sbi->s_kobj_unregister);
4102 err = kobject_init_and_add(&sbi->s_kobj, &ext4_ktype, NULL,
4103 "%s", sb->s_id);
4104 if (err)
4105 goto failed_mount7;
4106
4107 #ifdef CONFIG_QUOTA
4108 /* Enable quota usage during mount. */
4109 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) &&
4110 !(sb->s_flags & MS_RDONLY)) {
4111 err = ext4_enable_quotas(sb);
4112 if (err)
4113 goto failed_mount8;
4114 }
4115 #endif /* CONFIG_QUOTA */
4116
4117 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
4118 ext4_orphan_cleanup(sb, es);
4119 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
4120 if (needs_recovery) {
4121 ext4_msg(sb, KERN_INFO, "recovery complete");
4122 ext4_mark_recovery_complete(sb, es);
4123 }
4124 if (EXT4_SB(sb)->s_journal) {
4125 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
4126 descr = " journalled data mode";
4127 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
4128 descr = " ordered data mode";
4129 else
4130 descr = " writeback data mode";
4131 } else
4132 descr = "out journal";
4133
4134 if (test_opt(sb, DISCARD)) {
4135 struct request_queue *q = bdev_get_queue(sb->s_bdev);
4136 if (!blk_queue_discard(q))
4137 ext4_msg(sb, KERN_WARNING,
4138 "mounting with \"discard\" option, but "
4139 "the device does not support discard");
4140 }
4141
4142 ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. "
4143 "Opts: %s%s%s", descr, sbi->s_es->s_mount_opts,
4144 *sbi->s_es->s_mount_opts ? "; " : "", orig_data);
4145
4146 if (es->s_error_count)
4147 mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */
4148
4149 /* Enable message ratelimiting. Default is 10 messages per 5 secs. */
4150 ratelimit_state_init(&sbi->s_err_ratelimit_state, 5 * HZ, 10);
4151 ratelimit_state_init(&sbi->s_warning_ratelimit_state, 5 * HZ, 10);
4152 ratelimit_state_init(&sbi->s_msg_ratelimit_state, 5 * HZ, 10);
4153
4154 kfree(orig_data);
4155 return 0;
4156
4157 cantfind_ext4:
4158 if (!silent)
4159 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
4160 goto failed_mount;
4161
4162 #ifdef CONFIG_QUOTA
4163 failed_mount8:
4164 kobject_del(&sbi->s_kobj);
4165 #endif
4166 failed_mount7:
4167 ext4_unregister_li_request(sb);
4168 failed_mount6:
4169 ext4_mb_release(sb);
4170 failed_mount5:
4171 ext4_ext_release(sb);
4172 ext4_release_system_zone(sb);
4173 failed_mount4a:
4174 dput(sb->s_root);
4175 sb->s_root = NULL;
4176 failed_mount4:
4177 ext4_msg(sb, KERN_ERR, "mount failed");
4178 if (EXT4_SB(sb)->rsv_conversion_wq)
4179 destroy_workqueue(EXT4_SB(sb)->rsv_conversion_wq);
4180 failed_mount_wq:
4181 if (sbi->s_journal) {
4182 jbd2_journal_destroy(sbi->s_journal);
4183 sbi->s_journal = NULL;
4184 }
4185 failed_mount3:
4186 ext4_es_unregister_shrinker(sbi);
4187 del_timer(&sbi->s_err_report);
4188 if (sbi->s_flex_groups)
4189 ext4_kvfree(sbi->s_flex_groups);
4190 percpu_counter_destroy(&sbi->s_freeclusters_counter);
4191 percpu_counter_destroy(&sbi->s_freeinodes_counter);
4192 percpu_counter_destroy(&sbi->s_dirs_counter);
4193 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
4194 percpu_counter_destroy(&sbi->s_extent_cache_cnt);
4195 if (sbi->s_mmp_tsk)
4196 kthread_stop(sbi->s_mmp_tsk);
4197 failed_mount2:
4198 for (i = 0; i < db_count; i++)
4199 brelse(sbi->s_group_desc[i]);
4200 ext4_kvfree(sbi->s_group_desc);
4201 failed_mount:
4202 if (sbi->s_chksum_driver)
4203 crypto_free_shash(sbi->s_chksum_driver);
4204 if (sbi->s_proc) {
4205 remove_proc_entry("options", sbi->s_proc);
4206 remove_proc_entry(sb->s_id, ext4_proc_root);
4207 }
4208 #ifdef CONFIG_QUOTA
4209 for (i = 0; i < MAXQUOTAS; i++)
4210 kfree(sbi->s_qf_names[i]);
4211 #endif
4212 ext4_blkdev_remove(sbi);
4213 brelse(bh);
4214 out_fail:
4215 sb->s_fs_info = NULL;
4216 kfree(sbi->s_blockgroup_lock);
4217 kfree(sbi);
4218 out_free_orig:
4219 kfree(orig_data);
4220 return err ? err : ret;
4221 }
4222
4223 /*
4224 * Setup any per-fs journal parameters now. We'll do this both on
4225 * initial mount, once the journal has been initialised but before we've
4226 * done any recovery; and again on any subsequent remount.
4227 */
4228 static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
4229 {
4230 struct ext4_sb_info *sbi = EXT4_SB(sb);
4231
4232 journal->j_commit_interval = sbi->s_commit_interval;
4233 journal->j_min_batch_time = sbi->s_min_batch_time;
4234 journal->j_max_batch_time = sbi->s_max_batch_time;
4235
4236 write_lock(&journal->j_state_lock);
4237 if (test_opt(sb, BARRIER))
4238 journal->j_flags |= JBD2_BARRIER;
4239 else
4240 journal->j_flags &= ~JBD2_BARRIER;
4241 if (test_opt(sb, DATA_ERR_ABORT))
4242 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
4243 else
4244 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
4245 write_unlock(&journal->j_state_lock);
4246 }
4247
4248 static journal_t *ext4_get_journal(struct super_block *sb,
4249 unsigned int journal_inum)
4250 {
4251 struct inode *journal_inode;
4252 journal_t *journal;
4253
4254 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4255
4256 /* First, test for the existence of a valid inode on disk. Bad
4257 * things happen if we iget() an unused inode, as the subsequent
4258 * iput() will try to delete it. */
4259
4260 journal_inode = ext4_iget(sb, journal_inum);
4261 if (IS_ERR(journal_inode)) {
4262 ext4_msg(sb, KERN_ERR, "no journal found");
4263 return NULL;
4264 }
4265 if (!journal_inode->i_nlink) {
4266 make_bad_inode(journal_inode);
4267 iput(journal_inode);
4268 ext4_msg(sb, KERN_ERR, "journal inode is deleted");
4269 return NULL;
4270 }
4271
4272 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
4273 journal_inode, journal_inode->i_size);
4274 if (!S_ISREG(journal_inode->i_mode)) {
4275 ext4_msg(sb, KERN_ERR, "invalid journal inode");
4276 iput(journal_inode);
4277 return NULL;
4278 }
4279
4280 journal = jbd2_journal_init_inode(journal_inode);
4281 if (!journal) {
4282 ext4_msg(sb, KERN_ERR, "Could not load journal inode");
4283 iput(journal_inode);
4284 return NULL;
4285 }
4286 journal->j_private = sb;
4287 ext4_init_journal_params(sb, journal);
4288 return journal;
4289 }
4290
4291 static journal_t *ext4_get_dev_journal(struct super_block *sb,
4292 dev_t j_dev)
4293 {
4294 struct buffer_head *bh;
4295 journal_t *journal;
4296 ext4_fsblk_t start;
4297 ext4_fsblk_t len;
4298 int hblock, blocksize;
4299 ext4_fsblk_t sb_block;
4300 unsigned long offset;
4301 struct ext4_super_block *es;
4302 struct block_device *bdev;
4303
4304 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4305
4306 bdev = ext4_blkdev_get(j_dev, sb);
4307 if (bdev == NULL)
4308 return NULL;
4309
4310 blocksize = sb->s_blocksize;
4311 hblock = bdev_logical_block_size(bdev);
4312 if (blocksize < hblock) {
4313 ext4_msg(sb, KERN_ERR,
4314 "blocksize too small for journal device");
4315 goto out_bdev;
4316 }
4317
4318 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
4319 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
4320 set_blocksize(bdev, blocksize);
4321 if (!(bh = __bread(bdev, sb_block, blocksize))) {
4322 ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
4323 "external journal");
4324 goto out_bdev;
4325 }
4326
4327 es = (struct ext4_super_block *) (bh->b_data + offset);
4328 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
4329 !(le32_to_cpu(es->s_feature_incompat) &
4330 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
4331 ext4_msg(sb, KERN_ERR, "external journal has "
4332 "bad superblock");
4333 brelse(bh);
4334 goto out_bdev;
4335 }
4336
4337 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
4338 ext4_msg(sb, KERN_ERR, "journal UUID does not match");
4339 brelse(bh);
4340 goto out_bdev;
4341 }
4342
4343 len = ext4_blocks_count(es);
4344 start = sb_block + 1;
4345 brelse(bh); /* we're done with the superblock */
4346
4347 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
4348 start, len, blocksize);
4349 if (!journal) {
4350 ext4_msg(sb, KERN_ERR, "failed to create device journal");
4351 goto out_bdev;
4352 }
4353 journal->j_private = sb;
4354 ll_rw_block(READ | REQ_META | REQ_PRIO, 1, &journal->j_sb_buffer);
4355 wait_on_buffer(journal->j_sb_buffer);
4356 if (!buffer_uptodate(journal->j_sb_buffer)) {
4357 ext4_msg(sb, KERN_ERR, "I/O error on journal device");
4358 goto out_journal;
4359 }
4360 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
4361 ext4_msg(sb, KERN_ERR, "External journal has more than one "
4362 "user (unsupported) - %d",
4363 be32_to_cpu(journal->j_superblock->s_nr_users));
4364 goto out_journal;
4365 }
4366 EXT4_SB(sb)->journal_bdev = bdev;
4367 ext4_init_journal_params(sb, journal);
4368 return journal;
4369
4370 out_journal:
4371 jbd2_journal_destroy(journal);
4372 out_bdev:
4373 ext4_blkdev_put(bdev);
4374 return NULL;
4375 }
4376
4377 static int ext4_load_journal(struct super_block *sb,
4378 struct ext4_super_block *es,
4379 unsigned long journal_devnum)
4380 {
4381 journal_t *journal;
4382 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
4383 dev_t journal_dev;
4384 int err = 0;
4385 int really_read_only;
4386
4387 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4388
4389 if (journal_devnum &&
4390 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
4391 ext4_msg(sb, KERN_INFO, "external journal device major/minor "
4392 "numbers have changed");
4393 journal_dev = new_decode_dev(journal_devnum);
4394 } else
4395 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
4396
4397 really_read_only = bdev_read_only(sb->s_bdev);
4398
4399 /*
4400 * Are we loading a blank journal or performing recovery after a
4401 * crash? For recovery, we need to check in advance whether we
4402 * can get read-write access to the device.
4403 */
4404 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
4405 if (sb->s_flags & MS_RDONLY) {
4406 ext4_msg(sb, KERN_INFO, "INFO: recovery "
4407 "required on readonly filesystem");
4408 if (really_read_only) {
4409 ext4_msg(sb, KERN_ERR, "write access "
4410 "unavailable, cannot proceed");
4411 return -EROFS;
4412 }
4413 ext4_msg(sb, KERN_INFO, "write access will "
4414 "be enabled during recovery");
4415 }
4416 }
4417
4418 if (journal_inum && journal_dev) {
4419 ext4_msg(sb, KERN_ERR, "filesystem has both journal "
4420 "and inode journals!");
4421 return -EINVAL;
4422 }
4423
4424 if (journal_inum) {
4425 if (!(journal = ext4_get_journal(sb, journal_inum)))
4426 return -EINVAL;
4427 } else {
4428 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
4429 return -EINVAL;
4430 }
4431
4432 if (!(journal->j_flags & JBD2_BARRIER))
4433 ext4_msg(sb, KERN_INFO, "barriers disabled");
4434
4435 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
4436 err = jbd2_journal_wipe(journal, !really_read_only);
4437 if (!err) {
4438 char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL);
4439 if (save)
4440 memcpy(save, ((char *) es) +
4441 EXT4_S_ERR_START, EXT4_S_ERR_LEN);
4442 err = jbd2_journal_load(journal);
4443 if (save)
4444 memcpy(((char *) es) + EXT4_S_ERR_START,
4445 save, EXT4_S_ERR_LEN);
4446 kfree(save);
4447 }
4448
4449 if (err) {
4450 ext4_msg(sb, KERN_ERR, "error loading journal");
4451 jbd2_journal_destroy(journal);
4452 return err;
4453 }
4454
4455 EXT4_SB(sb)->s_journal = journal;
4456 ext4_clear_journal_err(sb, es);
4457
4458 if (!really_read_only && journal_devnum &&
4459 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
4460 es->s_journal_dev = cpu_to_le32(journal_devnum);
4461
4462 /* Make sure we flush the recovery flag to disk. */
4463 ext4_commit_super(sb, 1);
4464 }
4465
4466 return 0;
4467 }
4468
4469 static int ext4_commit_super(struct super_block *sb, int sync)
4470 {
4471 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
4472 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
4473 int error = 0;
4474
4475 if (!sbh || block_device_ejected(sb))
4476 return error;
4477 if (buffer_write_io_error(sbh)) {
4478 /*
4479 * Oh, dear. A previous attempt to write the
4480 * superblock failed. This could happen because the
4481 * USB device was yanked out. Or it could happen to
4482 * be a transient write error and maybe the block will
4483 * be remapped. Nothing we can do but to retry the
4484 * write and hope for the best.
4485 */
4486 ext4_msg(sb, KERN_ERR, "previous I/O error to "
4487 "superblock detected");
4488 clear_buffer_write_io_error(sbh);
4489 set_buffer_uptodate(sbh);
4490 }
4491 /*
4492 * If the file system is mounted read-only, don't update the
4493 * superblock write time. This avoids updating the superblock
4494 * write time when we are mounting the root file system
4495 * read/only but we need to replay the journal; at that point,
4496 * for people who are east of GMT and who make their clock
4497 * tick in localtime for Windows bug-for-bug compatibility,
4498 * the clock is set in the future, and this will cause e2fsck
4499 * to complain and force a full file system check.
4500 */
4501 if (!(sb->s_flags & MS_RDONLY))
4502 es->s_wtime = cpu_to_le32(get_seconds());
4503 if (sb->s_bdev->bd_part)
4504 es->s_kbytes_written =
4505 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written +
4506 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
4507 EXT4_SB(sb)->s_sectors_written_start) >> 1));
4508 else
4509 es->s_kbytes_written =
4510 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written);
4511 ext4_free_blocks_count_set(es,
4512 EXT4_C2B(EXT4_SB(sb), percpu_counter_sum_positive(
4513 &EXT4_SB(sb)->s_freeclusters_counter)));
4514 es->s_free_inodes_count =
4515 cpu_to_le32(percpu_counter_sum_positive(
4516 &EXT4_SB(sb)->s_freeinodes_counter));
4517 BUFFER_TRACE(sbh, "marking dirty");
4518 ext4_superblock_csum_set(sb);
4519 mark_buffer_dirty(sbh);
4520 if (sync) {
4521 error = sync_dirty_buffer(sbh);
4522 if (error)
4523 return error;
4524
4525 error = buffer_write_io_error(sbh);
4526 if (error) {
4527 ext4_msg(sb, KERN_ERR, "I/O error while writing "
4528 "superblock");
4529 clear_buffer_write_io_error(sbh);
4530 set_buffer_uptodate(sbh);
4531 }
4532 }
4533 return error;
4534 }
4535
4536 /*
4537 * Have we just finished recovery? If so, and if we are mounting (or
4538 * remounting) the filesystem readonly, then we will end up with a
4539 * consistent fs on disk. Record that fact.
4540 */
4541 static void ext4_mark_recovery_complete(struct super_block *sb,
4542 struct ext4_super_block *es)
4543 {
4544 journal_t *journal = EXT4_SB(sb)->s_journal;
4545
4546 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
4547 BUG_ON(journal != NULL);
4548 return;
4549 }
4550 jbd2_journal_lock_updates(journal);
4551 if (jbd2_journal_flush(journal) < 0)
4552 goto out;
4553
4554 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
4555 sb->s_flags & MS_RDONLY) {
4556 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4557 ext4_commit_super(sb, 1);
4558 }
4559
4560 out:
4561 jbd2_journal_unlock_updates(journal);
4562 }
4563
4564 /*
4565 * If we are mounting (or read-write remounting) a filesystem whose journal
4566 * has recorded an error from a previous lifetime, move that error to the
4567 * main filesystem now.
4568 */
4569 static void ext4_clear_journal_err(struct super_block *sb,
4570 struct ext4_super_block *es)
4571 {
4572 journal_t *journal;
4573 int j_errno;
4574 const char *errstr;
4575
4576 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4577
4578 journal = EXT4_SB(sb)->s_journal;
4579
4580 /*
4581 * Now check for any error status which may have been recorded in the
4582 * journal by a prior ext4_error() or ext4_abort()
4583 */
4584
4585 j_errno = jbd2_journal_errno(journal);
4586 if (j_errno) {
4587 char nbuf[16];
4588
4589 errstr = ext4_decode_error(sb, j_errno, nbuf);
4590 ext4_warning(sb, "Filesystem error recorded "
4591 "from previous mount: %s", errstr);
4592 ext4_warning(sb, "Marking fs in need of filesystem check.");
4593
4594 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
4595 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
4596 ext4_commit_super(sb, 1);
4597
4598 jbd2_journal_clear_err(journal);
4599 jbd2_journal_update_sb_errno(journal);
4600 }
4601 }
4602
4603 /*
4604 * Force the running and committing transactions to commit,
4605 * and wait on the commit.
4606 */
4607 int ext4_force_commit(struct super_block *sb)
4608 {
4609 journal_t *journal;
4610
4611 if (sb->s_flags & MS_RDONLY)
4612 return 0;
4613
4614 journal = EXT4_SB(sb)->s_journal;
4615 return ext4_journal_force_commit(journal);
4616 }
4617
4618 static int ext4_sync_fs(struct super_block *sb, int wait)
4619 {
4620 int ret = 0;
4621 tid_t target;
4622 bool needs_barrier = false;
4623 struct ext4_sb_info *sbi = EXT4_SB(sb);
4624
4625 trace_ext4_sync_fs(sb, wait);
4626 flush_workqueue(sbi->rsv_conversion_wq);
4627 /*
4628 * Writeback quota in non-journalled quota case - journalled quota has
4629 * no dirty dquots
4630 */
4631 dquot_writeback_dquots(sb, -1);
4632 /*
4633 * Data writeback is possible w/o journal transaction, so barrier must
4634 * being sent at the end of the function. But we can skip it if
4635 * transaction_commit will do it for us.
4636 */
4637 target = jbd2_get_latest_transaction(sbi->s_journal);
4638 if (wait && sbi->s_journal->j_flags & JBD2_BARRIER &&
4639 !jbd2_trans_will_send_data_barrier(sbi->s_journal, target))
4640 needs_barrier = true;
4641
4642 if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
4643 if (wait)
4644 ret = jbd2_log_wait_commit(sbi->s_journal, target);
4645 }
4646 if (needs_barrier) {
4647 int err;
4648 err = blkdev_issue_flush(sb->s_bdev, GFP_KERNEL, NULL);
4649 if (!ret)
4650 ret = err;
4651 }
4652
4653 return ret;
4654 }
4655
4656 static int ext4_sync_fs_nojournal(struct super_block *sb, int wait)
4657 {
4658 int ret = 0;
4659
4660 trace_ext4_sync_fs(sb, wait);
4661 flush_workqueue(EXT4_SB(sb)->rsv_conversion_wq);
4662 dquot_writeback_dquots(sb, -1);
4663 if (wait && test_opt(sb, BARRIER))
4664 ret = blkdev_issue_flush(sb->s_bdev, GFP_KERNEL, NULL);
4665
4666 return ret;
4667 }
4668
4669 /*
4670 * LVM calls this function before a (read-only) snapshot is created. This
4671 * gives us a chance to flush the journal completely and mark the fs clean.
4672 *
4673 * Note that only this function cannot bring a filesystem to be in a clean
4674 * state independently. It relies on upper layer to stop all data & metadata
4675 * modifications.
4676 */
4677 static int ext4_freeze(struct super_block *sb)
4678 {
4679 int error = 0;
4680 journal_t *journal;
4681
4682 if (sb->s_flags & MS_RDONLY)
4683 return 0;
4684
4685 journal = EXT4_SB(sb)->s_journal;
4686
4687 /* Now we set up the journal barrier. */
4688 jbd2_journal_lock_updates(journal);
4689
4690 /*
4691 * Don't clear the needs_recovery flag if we failed to flush
4692 * the journal.
4693 */
4694 error = jbd2_journal_flush(journal);
4695 if (error < 0)
4696 goto out;
4697
4698 /* Journal blocked and flushed, clear needs_recovery flag. */
4699 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4700 error = ext4_commit_super(sb, 1);
4701 out:
4702 /* we rely on upper layer to stop further updates */
4703 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
4704 return error;
4705 }
4706
4707 /*
4708 * Called by LVM after the snapshot is done. We need to reset the RECOVER
4709 * flag here, even though the filesystem is not technically dirty yet.
4710 */
4711 static int ext4_unfreeze(struct super_block *sb)
4712 {
4713 if (sb->s_flags & MS_RDONLY)
4714 return 0;
4715
4716 /* Reset the needs_recovery flag before the fs is unlocked. */
4717 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4718 ext4_commit_super(sb, 1);
4719 return 0;
4720 }
4721
4722 /*
4723 * Structure to save mount options for ext4_remount's benefit
4724 */
4725 struct ext4_mount_options {
4726 unsigned long s_mount_opt;
4727 unsigned long s_mount_opt2;
4728 kuid_t s_resuid;
4729 kgid_t s_resgid;
4730 unsigned long s_commit_interval;
4731 u32 s_min_batch_time, s_max_batch_time;
4732 #ifdef CONFIG_QUOTA
4733 int s_jquota_fmt;
4734 char *s_qf_names[MAXQUOTAS];
4735 #endif
4736 };
4737
4738 static int ext4_remount(struct super_block *sb, int *flags, char *data)
4739 {
4740 struct ext4_super_block *es;
4741 struct ext4_sb_info *sbi = EXT4_SB(sb);
4742 unsigned long old_sb_flags;
4743 struct ext4_mount_options old_opts;
4744 int enable_quota = 0;
4745 ext4_group_t g;
4746 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
4747 int err = 0;
4748 #ifdef CONFIG_QUOTA
4749 int i, j;
4750 #endif
4751 char *orig_data = kstrdup(data, GFP_KERNEL);
4752
4753 /* Store the original options */
4754 old_sb_flags = sb->s_flags;
4755 old_opts.s_mount_opt = sbi->s_mount_opt;
4756 old_opts.s_mount_opt2 = sbi->s_mount_opt2;
4757 old_opts.s_resuid = sbi->s_resuid;
4758 old_opts.s_resgid = sbi->s_resgid;
4759 old_opts.s_commit_interval = sbi->s_commit_interval;
4760 old_opts.s_min_batch_time = sbi->s_min_batch_time;
4761 old_opts.s_max_batch_time = sbi->s_max_batch_time;
4762 #ifdef CONFIG_QUOTA
4763 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
4764 for (i = 0; i < MAXQUOTAS; i++)
4765 if (sbi->s_qf_names[i]) {
4766 old_opts.s_qf_names[i] = kstrdup(sbi->s_qf_names[i],
4767 GFP_KERNEL);
4768 if (!old_opts.s_qf_names[i]) {
4769 for (j = 0; j < i; j++)
4770 kfree(old_opts.s_qf_names[j]);
4771 kfree(orig_data);
4772 return -ENOMEM;
4773 }
4774 } else
4775 old_opts.s_qf_names[i] = NULL;
4776 #endif
4777 if (sbi->s_journal && sbi->s_journal->j_task->io_context)
4778 journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
4779
4780 /*
4781 * Allow the "check" option to be passed as a remount option.
4782 */
4783 if (!parse_options(data, sb, NULL, &journal_ioprio, 1)) {
4784 err = -EINVAL;
4785 goto restore_opts;
4786 }
4787
4788 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
4789 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
4790 ext4_msg(sb, KERN_ERR, "can't mount with "
4791 "both data=journal and delalloc");
4792 err = -EINVAL;
4793 goto restore_opts;
4794 }
4795 if (test_opt(sb, DIOREAD_NOLOCK)) {
4796 ext4_msg(sb, KERN_ERR, "can't mount with "
4797 "both data=journal and dioread_nolock");
4798 err = -EINVAL;
4799 goto restore_opts;
4800 }
4801 }
4802
4803 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
4804 ext4_abort(sb, "Abort forced by user");
4805
4806 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
4807 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
4808
4809 es = sbi->s_es;
4810
4811 if (sbi->s_journal) {
4812 ext4_init_journal_params(sb, sbi->s_journal);
4813 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
4814 }
4815
4816 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
4817 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) {
4818 err = -EROFS;
4819 goto restore_opts;
4820 }
4821
4822 if (*flags & MS_RDONLY) {
4823 err = dquot_suspend(sb, -1);
4824 if (err < 0)
4825 goto restore_opts;
4826
4827 /*
4828 * First of all, the unconditional stuff we have to do
4829 * to disable replay of the journal when we next remount
4830 */
4831 sb->s_flags |= MS_RDONLY;
4832
4833 /*
4834 * OK, test if we are remounting a valid rw partition
4835 * readonly, and if so set the rdonly flag and then
4836 * mark the partition as valid again.
4837 */
4838 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
4839 (sbi->s_mount_state & EXT4_VALID_FS))
4840 es->s_state = cpu_to_le16(sbi->s_mount_state);
4841
4842 if (sbi->s_journal)
4843 ext4_mark_recovery_complete(sb, es);
4844 } else {
4845 /* Make sure we can mount this feature set readwrite */
4846 if (!ext4_feature_set_ok(sb, 0)) {
4847 err = -EROFS;
4848 goto restore_opts;
4849 }
4850 /*
4851 * Make sure the group descriptor checksums
4852 * are sane. If they aren't, refuse to remount r/w.
4853 */
4854 for (g = 0; g < sbi->s_groups_count; g++) {
4855 struct ext4_group_desc *gdp =
4856 ext4_get_group_desc(sb, g, NULL);
4857
4858 if (!ext4_group_desc_csum_verify(sb, g, gdp)) {
4859 ext4_msg(sb, KERN_ERR,
4860 "ext4_remount: Checksum for group %u failed (%u!=%u)",
4861 g, le16_to_cpu(ext4_group_desc_csum(sbi, g, gdp)),
4862 le16_to_cpu(gdp->bg_checksum));
4863 err = -EINVAL;
4864 goto restore_opts;
4865 }
4866 }
4867
4868 /*
4869 * If we have an unprocessed orphan list hanging
4870 * around from a previously readonly bdev mount,
4871 * require a full umount/remount for now.
4872 */
4873 if (es->s_last_orphan) {
4874 ext4_msg(sb, KERN_WARNING, "Couldn't "
4875 "remount RDWR because of unprocessed "
4876 "orphan inode list. Please "
4877 "umount/remount instead");
4878 err = -EINVAL;
4879 goto restore_opts;
4880 }
4881
4882 /*
4883 * Mounting a RDONLY partition read-write, so reread
4884 * and store the current valid flag. (It may have
4885 * been changed by e2fsck since we originally mounted
4886 * the partition.)
4887 */
4888 if (sbi->s_journal)
4889 ext4_clear_journal_err(sb, es);
4890 sbi->s_mount_state = le16_to_cpu(es->s_state);
4891 if (!ext4_setup_super(sb, es, 0))
4892 sb->s_flags &= ~MS_RDONLY;
4893 if (EXT4_HAS_INCOMPAT_FEATURE(sb,
4894 EXT4_FEATURE_INCOMPAT_MMP))
4895 if (ext4_multi_mount_protect(sb,
4896 le64_to_cpu(es->s_mmp_block))) {
4897 err = -EROFS;
4898 goto restore_opts;
4899 }
4900 enable_quota = 1;
4901 }
4902 }
4903
4904 /*
4905 * Reinitialize lazy itable initialization thread based on
4906 * current settings
4907 */
4908 if ((sb->s_flags & MS_RDONLY) || !test_opt(sb, INIT_INODE_TABLE))
4909 ext4_unregister_li_request(sb);
4910 else {
4911 ext4_group_t first_not_zeroed;
4912 first_not_zeroed = ext4_has_uninit_itable(sb);
4913 ext4_register_li_request(sb, first_not_zeroed);
4914 }
4915
4916 ext4_setup_system_zone(sb);
4917 if (sbi->s_journal == NULL && !(old_sb_flags & MS_RDONLY))
4918 ext4_commit_super(sb, 1);
4919
4920 #ifdef CONFIG_QUOTA
4921 /* Release old quota file names */
4922 for (i = 0; i < MAXQUOTAS; i++)
4923 kfree(old_opts.s_qf_names[i]);
4924 if (enable_quota) {
4925 if (sb_any_quota_suspended(sb))
4926 dquot_resume(sb, -1);
4927 else if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
4928 EXT4_FEATURE_RO_COMPAT_QUOTA)) {
4929 err = ext4_enable_quotas(sb);
4930 if (err)
4931 goto restore_opts;
4932 }
4933 }
4934 #endif
4935
4936 ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s", orig_data);
4937 kfree(orig_data);
4938 return 0;
4939
4940 restore_opts:
4941 sb->s_flags = old_sb_flags;
4942 sbi->s_mount_opt = old_opts.s_mount_opt;
4943 sbi->s_mount_opt2 = old_opts.s_mount_opt2;
4944 sbi->s_resuid = old_opts.s_resuid;
4945 sbi->s_resgid = old_opts.s_resgid;
4946 sbi->s_commit_interval = old_opts.s_commit_interval;
4947 sbi->s_min_batch_time = old_opts.s_min_batch_time;
4948 sbi->s_max_batch_time = old_opts.s_max_batch_time;
4949 #ifdef CONFIG_QUOTA
4950 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
4951 for (i = 0; i < MAXQUOTAS; i++) {
4952 kfree(sbi->s_qf_names[i]);
4953 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
4954 }
4955 #endif
4956 kfree(orig_data);
4957 return err;
4958 }
4959
4960 static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
4961 {
4962 struct super_block *sb = dentry->d_sb;
4963 struct ext4_sb_info *sbi = EXT4_SB(sb);
4964 struct ext4_super_block *es = sbi->s_es;
4965 ext4_fsblk_t overhead = 0, resv_blocks;
4966 u64 fsid;
4967 s64 bfree;
4968 resv_blocks = EXT4_C2B(sbi, atomic64_read(&sbi->s_resv_clusters));
4969
4970 if (!test_opt(sb, MINIX_DF))
4971 overhead = sbi->s_overhead;
4972
4973 buf->f_type = EXT4_SUPER_MAGIC;
4974 buf->f_bsize = sb->s_blocksize;
4975 buf->f_blocks = ext4_blocks_count(es) - EXT4_C2B(sbi, overhead);
4976 bfree = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) -
4977 percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter);
4978 /* prevent underflow in case that few free space is available */
4979 buf->f_bfree = EXT4_C2B(sbi, max_t(s64, bfree, 0));
4980 buf->f_bavail = buf->f_bfree -
4981 (ext4_r_blocks_count(es) + resv_blocks);
4982 if (buf->f_bfree < (ext4_r_blocks_count(es) + resv_blocks))
4983 buf->f_bavail = 0;
4984 buf->f_files = le32_to_cpu(es->s_inodes_count);
4985 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
4986 buf->f_namelen = EXT4_NAME_LEN;
4987 fsid = le64_to_cpup((void *)es->s_uuid) ^
4988 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
4989 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
4990 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
4991
4992 return 0;
4993 }
4994
4995 /* Helper function for writing quotas on sync - we need to start transaction
4996 * before quota file is locked for write. Otherwise the are possible deadlocks:
4997 * Process 1 Process 2
4998 * ext4_create() quota_sync()
4999 * jbd2_journal_start() write_dquot()
5000 * dquot_initialize() down(dqio_mutex)
5001 * down(dqio_mutex) jbd2_journal_start()
5002 *
5003 */
5004
5005 #ifdef CONFIG_QUOTA
5006
5007 static inline struct inode *dquot_to_inode(struct dquot *dquot)
5008 {
5009 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_id.type];
5010 }
5011
5012 static int ext4_write_dquot(struct dquot *dquot)
5013 {
5014 int ret, err;
5015 handle_t *handle;
5016 struct inode *inode;
5017
5018 inode = dquot_to_inode(dquot);
5019 handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
5020 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
5021 if (IS_ERR(handle))
5022 return PTR_ERR(handle);
5023 ret = dquot_commit(dquot);
5024 err = ext4_journal_stop(handle);
5025 if (!ret)
5026 ret = err;
5027 return ret;
5028 }
5029
5030 static int ext4_acquire_dquot(struct dquot *dquot)
5031 {
5032 int ret, err;
5033 handle_t *handle;
5034
5035 handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
5036 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
5037 if (IS_ERR(handle))
5038 return PTR_ERR(handle);
5039 ret = dquot_acquire(dquot);
5040 err = ext4_journal_stop(handle);
5041 if (!ret)
5042 ret = err;
5043 return ret;
5044 }
5045
5046 static int ext4_release_dquot(struct dquot *dquot)
5047 {
5048 int ret, err;
5049 handle_t *handle;
5050
5051 handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
5052 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
5053 if (IS_ERR(handle)) {
5054 /* Release dquot anyway to avoid endless cycle in dqput() */
5055 dquot_release(dquot);
5056 return PTR_ERR(handle);
5057 }
5058 ret = dquot_release(dquot);
5059 err = ext4_journal_stop(handle);
5060 if (!ret)
5061 ret = err;
5062 return ret;
5063 }
5064
5065 static int ext4_mark_dquot_dirty(struct dquot *dquot)
5066 {
5067 struct super_block *sb = dquot->dq_sb;
5068 struct ext4_sb_info *sbi = EXT4_SB(sb);
5069
5070 /* Are we journaling quotas? */
5071 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) ||
5072 sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
5073 dquot_mark_dquot_dirty(dquot);
5074 return ext4_write_dquot(dquot);
5075 } else {
5076 return dquot_mark_dquot_dirty(dquot);
5077 }
5078 }
5079
5080 static int ext4_write_info(struct super_block *sb, int type)
5081 {
5082 int ret, err;
5083 handle_t *handle;
5084
5085 /* Data block + inode block */
5086 handle = ext4_journal_start(sb->s_root->d_inode, EXT4_HT_QUOTA, 2);
5087 if (IS_ERR(handle))
5088 return PTR_ERR(handle);
5089 ret = dquot_commit_info(sb, type);
5090 err = ext4_journal_stop(handle);
5091 if (!ret)
5092 ret = err;
5093 return ret;
5094 }
5095
5096 /*
5097 * Turn on quotas during mount time - we need to find
5098 * the quota file and such...
5099 */
5100 static int ext4_quota_on_mount(struct super_block *sb, int type)
5101 {
5102 return dquot_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
5103 EXT4_SB(sb)->s_jquota_fmt, type);
5104 }
5105
5106 /*
5107 * Standard function to be called on quota_on
5108 */
5109 static int ext4_quota_on(struct super_block *sb, int type, int format_id,
5110 struct path *path)
5111 {
5112 int err;
5113
5114 if (!test_opt(sb, QUOTA))
5115 return -EINVAL;
5116
5117 /* Quotafile not on the same filesystem? */
5118 if (path->dentry->d_sb != sb)
5119 return -EXDEV;
5120 /* Journaling quota? */
5121 if (EXT4_SB(sb)->s_qf_names[type]) {
5122 /* Quotafile not in fs root? */
5123 if (path->dentry->d_parent != sb->s_root)
5124 ext4_msg(sb, KERN_WARNING,
5125 "Quota file not on filesystem root. "
5126 "Journaled quota will not work");
5127 }
5128
5129 /*
5130 * When we journal data on quota file, we have to flush journal to see
5131 * all updates to the file when we bypass pagecache...
5132 */
5133 if (EXT4_SB(sb)->s_journal &&
5134 ext4_should_journal_data(path->dentry->d_inode)) {
5135 /*
5136 * We don't need to lock updates but journal_flush() could
5137 * otherwise be livelocked...
5138 */
5139 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
5140 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
5141 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
5142 if (err)
5143 return err;
5144 }
5145
5146 return dquot_quota_on(sb, type, format_id, path);
5147 }
5148
5149 static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
5150 unsigned int flags)
5151 {
5152 int err;
5153 struct inode *qf_inode;
5154 unsigned long qf_inums[MAXQUOTAS] = {
5155 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
5156 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum)
5157 };
5158
5159 BUG_ON(!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA));
5160
5161 if (!qf_inums[type])
5162 return -EPERM;
5163
5164 qf_inode = ext4_iget(sb, qf_inums[type]);
5165 if (IS_ERR(qf_inode)) {
5166 ext4_error(sb, "Bad quota inode # %lu", qf_inums[type]);
5167 return PTR_ERR(qf_inode);
5168 }
5169
5170 /* Don't account quota for quota files to avoid recursion */
5171 qf_inode->i_flags |= S_NOQUOTA;
5172 err = dquot_enable(qf_inode, type, format_id, flags);
5173 iput(qf_inode);
5174
5175 return err;
5176 }
5177
5178 /* Enable usage tracking for all quota types. */
5179 static int ext4_enable_quotas(struct super_block *sb)
5180 {
5181 int type, err = 0;
5182 unsigned long qf_inums[MAXQUOTAS] = {
5183 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
5184 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum)
5185 };
5186
5187 sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE;
5188 for (type = 0; type < MAXQUOTAS; type++) {
5189 if (qf_inums[type]) {
5190 err = ext4_quota_enable(sb, type, QFMT_VFS_V1,
5191 DQUOT_USAGE_ENABLED);
5192 if (err) {
5193 ext4_warning(sb,
5194 "Failed to enable quota tracking "
5195 "(type=%d, err=%d). Please run "
5196 "e2fsck to fix.", type, err);
5197 return err;
5198 }
5199 }
5200 }
5201 return 0;
5202 }
5203
5204 /*
5205 * quota_on function that is used when QUOTA feature is set.
5206 */
5207 static int ext4_quota_on_sysfile(struct super_block *sb, int type,
5208 int format_id)
5209 {
5210 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA))
5211 return -EINVAL;
5212
5213 /*
5214 * USAGE was enabled at mount time. Only need to enable LIMITS now.
5215 */
5216 return ext4_quota_enable(sb, type, format_id, DQUOT_LIMITS_ENABLED);
5217 }
5218
5219 static int ext4_quota_off(struct super_block *sb, int type)
5220 {
5221 struct inode *inode = sb_dqopt(sb)->files[type];
5222 handle_t *handle;
5223
5224 /* Force all delayed allocation blocks to be allocated.
5225 * Caller already holds s_umount sem */
5226 if (test_opt(sb, DELALLOC))
5227 sync_filesystem(sb);
5228
5229 if (!inode)
5230 goto out;
5231
5232 /* Update modification times of quota files when userspace can
5233 * start looking at them */
5234 handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1);
5235 if (IS_ERR(handle))
5236 goto out;
5237 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
5238 ext4_mark_inode_dirty(handle, inode);
5239 ext4_journal_stop(handle);
5240
5241 out:
5242 return dquot_quota_off(sb, type);
5243 }
5244
5245 /*
5246 * quota_off function that is used when QUOTA feature is set.
5247 */
5248 static int ext4_quota_off_sysfile(struct super_block *sb, int type)
5249 {
5250 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA))
5251 return -EINVAL;
5252
5253 /* Disable only the limits. */
5254 return dquot_disable(sb, type, DQUOT_LIMITS_ENABLED);
5255 }
5256
5257 /* Read data from quotafile - avoid pagecache and such because we cannot afford
5258 * acquiring the locks... As quota files are never truncated and quota code
5259 * itself serializes the operations (and no one else should touch the files)
5260 * we don't have to be afraid of races */
5261 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
5262 size_t len, loff_t off)
5263 {
5264 struct inode *inode = sb_dqopt(sb)->files[type];
5265 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
5266 int err = 0;
5267 int offset = off & (sb->s_blocksize - 1);
5268 int tocopy;
5269 size_t toread;
5270 struct buffer_head *bh;
5271 loff_t i_size = i_size_read(inode);
5272
5273 if (off > i_size)
5274 return 0;
5275 if (off+len > i_size)
5276 len = i_size-off;
5277 toread = len;
5278 while (toread > 0) {
5279 tocopy = sb->s_blocksize - offset < toread ?
5280 sb->s_blocksize - offset : toread;
5281 bh = ext4_bread(NULL, inode, blk, 0, &err);
5282 if (err)
5283 return err;
5284 if (!bh) /* A hole? */
5285 memset(data, 0, tocopy);
5286 else
5287 memcpy(data, bh->b_data+offset, tocopy);
5288 brelse(bh);
5289 offset = 0;
5290 toread -= tocopy;
5291 data += tocopy;
5292 blk++;
5293 }
5294 return len;
5295 }
5296
5297 /* Write to quotafile (we know the transaction is already started and has
5298 * enough credits) */
5299 static ssize_t ext4_quota_write(struct super_block *sb, int type,
5300 const char *data, size_t len, loff_t off)
5301 {
5302 struct inode *inode = sb_dqopt(sb)->files[type];
5303 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
5304 int err = 0;
5305 int offset = off & (sb->s_blocksize - 1);
5306 struct buffer_head *bh;
5307 handle_t *handle = journal_current_handle();
5308
5309 if (EXT4_SB(sb)->s_journal && !handle) {
5310 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
5311 " cancelled because transaction is not started",
5312 (unsigned long long)off, (unsigned long long)len);
5313 return -EIO;
5314 }
5315 /*
5316 * Since we account only one data block in transaction credits,
5317 * then it is impossible to cross a block boundary.
5318 */
5319 if (sb->s_blocksize - offset < len) {
5320 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
5321 " cancelled because not block aligned",
5322 (unsigned long long)off, (unsigned long long)len);
5323 return -EIO;
5324 }
5325
5326 bh = ext4_bread(handle, inode, blk, 1, &err);
5327 if (!bh)
5328 goto out;
5329 err = ext4_journal_get_write_access(handle, bh);
5330 if (err) {
5331 brelse(bh);
5332 goto out;
5333 }
5334 lock_buffer(bh);
5335 memcpy(bh->b_data+offset, data, len);
5336 flush_dcache_page(bh->b_page);
5337 unlock_buffer(bh);
5338 err = ext4_handle_dirty_metadata(handle, NULL, bh);
5339 brelse(bh);
5340 out:
5341 if (err)
5342 return err;
5343 if (inode->i_size < off + len) {
5344 i_size_write(inode, off + len);
5345 EXT4_I(inode)->i_disksize = inode->i_size;
5346 ext4_mark_inode_dirty(handle, inode);
5347 }
5348 return len;
5349 }
5350
5351 #endif
5352
5353 static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
5354 const char *dev_name, void *data)
5355 {
5356 return mount_bdev(fs_type, flags, dev_name, data, ext4_fill_super);
5357 }
5358
5359 #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
5360 static inline void register_as_ext2(void)
5361 {
5362 int err = register_filesystem(&ext2_fs_type);
5363 if (err)
5364 printk(KERN_WARNING
5365 "EXT4-fs: Unable to register as ext2 (%d)\n", err);
5366 }
5367
5368 static inline void unregister_as_ext2(void)
5369 {
5370 unregister_filesystem(&ext2_fs_type);
5371 }
5372
5373 static inline int ext2_feature_set_ok(struct super_block *sb)
5374 {
5375 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP))
5376 return 0;
5377 if (sb->s_flags & MS_RDONLY)
5378 return 1;
5379 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))
5380 return 0;
5381 return 1;
5382 }
5383 #else
5384 static inline void register_as_ext2(void) { }
5385 static inline void unregister_as_ext2(void) { }
5386 static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; }
5387 #endif
5388
5389 #if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
5390 static inline void register_as_ext3(void)
5391 {
5392 int err = register_filesystem(&ext3_fs_type);
5393 if (err)
5394 printk(KERN_WARNING
5395 "EXT4-fs: Unable to register as ext3 (%d)\n", err);
5396 }
5397
5398 static inline void unregister_as_ext3(void)
5399 {
5400 unregister_filesystem(&ext3_fs_type);
5401 }
5402
5403 static inline int ext3_feature_set_ok(struct super_block *sb)
5404 {
5405 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP))
5406 return 0;
5407 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
5408 return 0;
5409 if (sb->s_flags & MS_RDONLY)
5410 return 1;
5411 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP))
5412 return 0;
5413 return 1;
5414 }
5415 #else
5416 static inline void register_as_ext3(void) { }
5417 static inline void unregister_as_ext3(void) { }
5418 static inline int ext3_feature_set_ok(struct super_block *sb) { return 0; }
5419 #endif
5420
5421 static struct file_system_type ext4_fs_type = {
5422 .owner = THIS_MODULE,
5423 .name = "ext4",
5424 .mount = ext4_mount,
5425 .kill_sb = kill_block_super,
5426 .fs_flags = FS_REQUIRES_DEV,
5427 };
5428 MODULE_ALIAS_FS("ext4");
5429
5430 static int __init ext4_init_feat_adverts(void)
5431 {
5432 struct ext4_features *ef;
5433 int ret = -ENOMEM;
5434
5435 ef = kzalloc(sizeof(struct ext4_features), GFP_KERNEL);
5436 if (!ef)
5437 goto out;
5438
5439 ef->f_kobj.kset = ext4_kset;
5440 init_completion(&ef->f_kobj_unregister);
5441 ret = kobject_init_and_add(&ef->f_kobj, &ext4_feat_ktype, NULL,
5442 "features");
5443 if (ret) {
5444 kfree(ef);
5445 goto out;
5446 }
5447
5448 ext4_feat = ef;
5449 ret = 0;
5450 out:
5451 return ret;
5452 }
5453
5454 static void ext4_exit_feat_adverts(void)
5455 {
5456 kobject_put(&ext4_feat->f_kobj);
5457 wait_for_completion(&ext4_feat->f_kobj_unregister);
5458 kfree(ext4_feat);
5459 }
5460
5461 /* Shared across all ext4 file systems */
5462 wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
5463 struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ];
5464
5465 static int __init ext4_init_fs(void)
5466 {
5467 int i, err;
5468
5469 ext4_li_info = NULL;
5470 mutex_init(&ext4_li_mtx);
5471
5472 /* Build-time check for flags consistency */
5473 ext4_check_flag_values();
5474
5475 for (i = 0; i < EXT4_WQ_HASH_SZ; i++) {
5476 mutex_init(&ext4__aio_mutex[i]);
5477 init_waitqueue_head(&ext4__ioend_wq[i]);
5478 }
5479
5480 err = ext4_init_es();
5481 if (err)
5482 return err;
5483
5484 err = ext4_init_pageio();
5485 if (err)
5486 goto out7;
5487
5488 err = ext4_init_system_zone();
5489 if (err)
5490 goto out6;
5491 ext4_kset = kset_create_and_add("ext4", NULL, fs_kobj);
5492 if (!ext4_kset) {
5493 err = -ENOMEM;
5494 goto out5;
5495 }
5496 ext4_proc_root = proc_mkdir("fs/ext4", NULL);
5497
5498 err = ext4_init_feat_adverts();
5499 if (err)
5500 goto out4;
5501
5502 err = ext4_init_mballoc();
5503 if (err)
5504 goto out3;
5505
5506 err = ext4_init_xattr();
5507 if (err)
5508 goto out2;
5509 err = init_inodecache();
5510 if (err)
5511 goto out1;
5512 register_as_ext3();
5513 register_as_ext2();
5514 err = register_filesystem(&ext4_fs_type);
5515 if (err)
5516 goto out;
5517
5518 return 0;
5519 out:
5520 unregister_as_ext2();
5521 unregister_as_ext3();
5522 destroy_inodecache();
5523 out1:
5524 ext4_exit_xattr();
5525 out2:
5526 ext4_exit_mballoc();
5527 out3:
5528 ext4_exit_feat_adverts();
5529 out4:
5530 if (ext4_proc_root)
5531 remove_proc_entry("fs/ext4", NULL);
5532 kset_unregister(ext4_kset);
5533 out5:
5534 ext4_exit_system_zone();
5535 out6:
5536 ext4_exit_pageio();
5537 out7:
5538 ext4_exit_es();
5539
5540 return err;
5541 }
5542
5543 static void __exit ext4_exit_fs(void)
5544 {
5545 ext4_destroy_lazyinit_thread();
5546 unregister_as_ext2();
5547 unregister_as_ext3();
5548 unregister_filesystem(&ext4_fs_type);
5549 destroy_inodecache();
5550 ext4_exit_xattr();
5551 ext4_exit_mballoc();
5552 ext4_exit_feat_adverts();
5553 remove_proc_entry("fs/ext4", NULL);
5554 kset_unregister(ext4_kset);
5555 ext4_exit_system_zone();
5556 ext4_exit_pageio();
5557 ext4_exit_es();
5558 }
5559
5560 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
5561 MODULE_DESCRIPTION("Fourth Extended Filesystem");
5562 MODULE_LICENSE("GPL");
5563 module_init(ext4_init_fs)
5564 module_exit(ext4_exit_fs)
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