?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
staging: r8723au: move function type in line with function name
[linux/fpc-iii.git] / fs / ext4 / super.c
bloba63c7b0a10cfca3b3075f4dc14435add1bcec91b
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/slab.h>
25 #include <linux/init.h>
26 #include <linux/blkdev.h>
27 #include <linux/backing-dev.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 static int ext4_mballoc_ready;
63 static struct ratelimit_state ext4_mount_msg_ratelimit;
64
65 static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
66 unsigned long journal_devnum);
67 static int ext4_show_options(struct seq_file *seq, struct dentry *root);
68 static int ext4_commit_super(struct super_block *sb, int sync);
69 static void ext4_mark_recovery_complete(struct super_block *sb,
70 struct ext4_super_block *es);
71 static void ext4_clear_journal_err(struct super_block *sb,
72 struct ext4_super_block *es);
73 static int ext4_sync_fs(struct super_block *sb, int wait);
74 static int ext4_remount(struct super_block *sb, int *flags, char *data);
75 static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
76 static int ext4_unfreeze(struct super_block *sb);
77 static int ext4_freeze(struct super_block *sb);
78 static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
79 const char *dev_name, void *data);
80 static inline int ext2_feature_set_ok(struct super_block *sb);
81 static inline int ext3_feature_set_ok(struct super_block *sb);
82 static int ext4_feature_set_ok(struct super_block *sb, int readonly);
83 static void ext4_destroy_lazyinit_thread(void);
84 static void ext4_unregister_li_request(struct super_block *sb);
85 static void ext4_clear_request_list(void);
86 static int ext4_reserve_clusters(struct ext4_sb_info *, ext4_fsblk_t);
87
88 #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2)
89 static struct file_system_type ext2_fs_type = {
90 .owner = THIS_MODULE,
91 .name = "ext2",
92 .mount = ext4_mount,
93 .kill_sb = kill_block_super,
94 .fs_flags = FS_REQUIRES_DEV,
95 };
96 MODULE_ALIAS_FS("ext2");
97 MODULE_ALIAS("ext2");
98 #define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type)
99 #else
100 #define IS_EXT2_SB(sb) (0)
101 #endif
102
103
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
115 static int ext4_verify_csum_type(struct super_block *sb,
116 struct ext4_super_block *es)
117 {
118 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
119 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
120 return 1;
121
122 return es->s_checksum_type == EXT4_CRC32C_CHKSUM;
123 }
124
125 static __le32 ext4_superblock_csum(struct super_block *sb,
126 struct ext4_super_block *es)
127 {
128 struct ext4_sb_info *sbi = EXT4_SB(sb);
129 int offset = offsetof(struct ext4_super_block, s_checksum);
130 __u32 csum;
131
132 csum = ext4_chksum(sbi, ~0, (char *)es, offset);
133
134 return cpu_to_le32(csum);
135 }
136
137 static int ext4_superblock_csum_verify(struct super_block *sb,
138 struct ext4_super_block *es)
139 {
140 if (!ext4_has_metadata_csum(sb))
141 return 1;
142
143 return es->s_checksum == ext4_superblock_csum(sb, es);
144 }
145
146 void ext4_superblock_csum_set(struct super_block *sb)
147 {
148 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
149
150 if (!ext4_has_metadata_csum(sb))
151 return;
152
153 es->s_checksum = ext4_superblock_csum(sb, es);
154 }
155
156 void *ext4_kvmalloc(size_t size, gfp_t flags)
157 {
158 void *ret;
159
160 ret = kmalloc(size, flags | __GFP_NOWARN);
161 if (!ret)
162 ret = __vmalloc(size, flags, PAGE_KERNEL);
163 return ret;
164 }
165
166 void *ext4_kvzalloc(size_t size, gfp_t flags)
167 {
168 void *ret;
169
170 ret = kzalloc(size, flags | __GFP_NOWARN);
171 if (!ret)
172 ret = __vmalloc(size, flags | __GFP_ZERO, PAGE_KERNEL);
173 return ret;
174 }
175
176 ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
177 struct ext4_group_desc *bg)
178 {
179 return le32_to_cpu(bg->bg_block_bitmap_lo) |
180 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
181 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
182 }
183
184 ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
185 struct ext4_group_desc *bg)
186 {
187 return le32_to_cpu(bg->bg_inode_bitmap_lo) |
188 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
189 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
190 }
191
192 ext4_fsblk_t ext4_inode_table(struct super_block *sb,
193 struct ext4_group_desc *bg)
194 {
195 return le32_to_cpu(bg->bg_inode_table_lo) |
196 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
197 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
198 }
199
200 __u32 ext4_free_group_clusters(struct super_block *sb,
201 struct ext4_group_desc *bg)
202 {
203 return le16_to_cpu(bg->bg_free_blocks_count_lo) |
204 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
205 (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0);
206 }
207
208 __u32 ext4_free_inodes_count(struct super_block *sb,
209 struct ext4_group_desc *bg)
210 {
211 return le16_to_cpu(bg->bg_free_inodes_count_lo) |
212 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
213 (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0);
214 }
215
216 __u32 ext4_used_dirs_count(struct super_block *sb,
217 struct ext4_group_desc *bg)
218 {
219 return le16_to_cpu(bg->bg_used_dirs_count_lo) |
220 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
221 (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0);
222 }
223
224 __u32 ext4_itable_unused_count(struct super_block *sb,
225 struct ext4_group_desc *bg)
226 {
227 return le16_to_cpu(bg->bg_itable_unused_lo) |
228 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
229 (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0);
230 }
231
232 void ext4_block_bitmap_set(struct super_block *sb,
233 struct ext4_group_desc *bg, ext4_fsblk_t blk)
234 {
235 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
236 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
237 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
238 }
239
240 void ext4_inode_bitmap_set(struct super_block *sb,
241 struct ext4_group_desc *bg, ext4_fsblk_t blk)
242 {
243 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk);
244 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
245 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
246 }
247
248 void ext4_inode_table_set(struct super_block *sb,
249 struct ext4_group_desc *bg, ext4_fsblk_t blk)
250 {
251 bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
252 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
253 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
254 }
255
256 void ext4_free_group_clusters_set(struct super_block *sb,
257 struct ext4_group_desc *bg, __u32 count)
258 {
259 bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count);
260 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
261 bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16);
262 }
263
264 void ext4_free_inodes_set(struct super_block *sb,
265 struct ext4_group_desc *bg, __u32 count)
266 {
267 bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count);
268 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
269 bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16);
270 }
271
272 void ext4_used_dirs_set(struct super_block *sb,
273 struct ext4_group_desc *bg, __u32 count)
274 {
275 bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count);
276 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
277 bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16);
278 }
279
280 void ext4_itable_unused_set(struct super_block *sb,
281 struct ext4_group_desc *bg, __u32 count)
282 {
283 bg->bg_itable_unused_lo = cpu_to_le16((__u16)count);
284 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
285 bg->bg_itable_unused_hi = cpu_to_le16(count >> 16);
286 }
287
288
289 static void __save_error_info(struct super_block *sb, const char *func,
290 unsigned int line)
291 {
292 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
293
294 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
295 if (bdev_read_only(sb->s_bdev))
296 return;
297 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
298 es->s_last_error_time = cpu_to_le32(get_seconds());
299 strncpy(es->s_last_error_func, func, sizeof(es->s_last_error_func));
300 es->s_last_error_line = cpu_to_le32(line);
301 if (!es->s_first_error_time) {
302 es->s_first_error_time = es->s_last_error_time;
303 strncpy(es->s_first_error_func, func,
304 sizeof(es->s_first_error_func));
305 es->s_first_error_line = cpu_to_le32(line);
306 es->s_first_error_ino = es->s_last_error_ino;
307 es->s_first_error_block = es->s_last_error_block;
308 }
309 /*
310 * Start the daily error reporting function if it hasn't been
311 * started already
312 */
313 if (!es->s_error_count)
314 mod_timer(&EXT4_SB(sb)->s_err_report, jiffies + 24*60*60*HZ);
315 le32_add_cpu(&es->s_error_count, 1);
316 }
317
318 static void save_error_info(struct super_block *sb, const char *func,
319 unsigned int line)
320 {
321 __save_error_info(sb, func, line);
322 ext4_commit_super(sb, 1);
323 }
324
325 /*
326 * The del_gendisk() function uninitializes the disk-specific data
327 * structures, including the bdi structure, without telling anyone
328 * else. Once this happens, any attempt to call mark_buffer_dirty()
329 * (for example, by ext4_commit_super), will cause a kernel OOPS.
330 * This is a kludge to prevent these oops until we can put in a proper
331 * hook in del_gendisk() to inform the VFS and file system layers.
332 */
333 static int block_device_ejected(struct super_block *sb)
334 {
335 struct inode *bd_inode = sb->s_bdev->bd_inode;
336 struct backing_dev_info *bdi = inode_to_bdi(bd_inode);
337
338 return bdi->dev == NULL;
339 }
340
341 static void ext4_journal_commit_callback(journal_t *journal, transaction_t *txn)
342 {
343 struct super_block *sb = journal->j_private;
344 struct ext4_sb_info *sbi = EXT4_SB(sb);
345 int error = is_journal_aborted(journal);
346 struct ext4_journal_cb_entry *jce;
347
348 BUG_ON(txn->t_state == T_FINISHED);
349 spin_lock(&sbi->s_md_lock);
350 while (!list_empty(&txn->t_private_list)) {
351 jce = list_entry(txn->t_private_list.next,
352 struct ext4_journal_cb_entry, jce_list);
353 list_del_init(&jce->jce_list);
354 spin_unlock(&sbi->s_md_lock);
355 jce->jce_func(sb, jce, error);
356 spin_lock(&sbi->s_md_lock);
357 }
358 spin_unlock(&sbi->s_md_lock);
359 }
360
361 /* Deal with the reporting of failure conditions on a filesystem such as
362 * inconsistencies detected or read IO failures.
363 *
364 * On ext2, we can store the error state of the filesystem in the
365 * superblock. That is not possible on ext4, because we may have other
366 * write ordering constraints on the superblock which prevent us from
367 * writing it out straight away; and given that the journal is about to
368 * be aborted, we can't rely on the current, or future, transactions to
369 * write out the superblock safely.
370 *
371 * We'll just use the jbd2_journal_abort() error code to record an error in
372 * the journal instead. On recovery, the journal will complain about
373 * that error until we've noted it down and cleared it.
374 */
375
376 static void ext4_handle_error(struct super_block *sb)
377 {
378 if (sb->s_flags & MS_RDONLY)
379 return;
380
381 if (!test_opt(sb, ERRORS_CONT)) {
382 journal_t *journal = EXT4_SB(sb)->s_journal;
383
384 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
385 if (journal)
386 jbd2_journal_abort(journal, -EIO);
387 }
388 if (test_opt(sb, ERRORS_RO)) {
389 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
390 /*
391 * Make sure updated value of ->s_mount_flags will be visible
392 * before ->s_flags update
393 */
394 smp_wmb();
395 sb->s_flags |= MS_RDONLY;
396 }
397 if (test_opt(sb, ERRORS_PANIC))
398 panic("EXT4-fs (device %s): panic forced after error\n",
399 sb->s_id);
400 }
401
402 #define ext4_error_ratelimit(sb) \
403 ___ratelimit(&(EXT4_SB(sb)->s_err_ratelimit_state), \
404 "EXT4-fs error")
405
406 void __ext4_error(struct super_block *sb, const char *function,
407 unsigned int line, const char *fmt, ...)
408 {
409 struct va_format vaf;
410 va_list args;
411
412 if (ext4_error_ratelimit(sb)) {
413 va_start(args, fmt);
414 vaf.fmt = fmt;
415 vaf.va = &args;
416 printk(KERN_CRIT
417 "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n",
418 sb->s_id, function, line, current->comm, &vaf);
419 va_end(args);
420 }
421 save_error_info(sb, function, line);
422 ext4_handle_error(sb);
423 }
424
425 void __ext4_error_inode(struct inode *inode, const char *function,
426 unsigned int line, ext4_fsblk_t block,
427 const char *fmt, ...)
428 {
429 va_list args;
430 struct va_format vaf;
431 struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
432
433 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
434 es->s_last_error_block = cpu_to_le64(block);
435 if (ext4_error_ratelimit(inode->i_sb)) {
436 va_start(args, fmt);
437 vaf.fmt = fmt;
438 vaf.va = &args;
439 if (block)
440 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
441 "inode #%lu: block %llu: comm %s: %pV\n",
442 inode->i_sb->s_id, function, line, inode->i_ino,
443 block, current->comm, &vaf);
444 else
445 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
446 "inode #%lu: comm %s: %pV\n",
447 inode->i_sb->s_id, function, line, inode->i_ino,
448 current->comm, &vaf);
449 va_end(args);
450 }
451 save_error_info(inode->i_sb, function, line);
452 ext4_handle_error(inode->i_sb);
453 }
454
455 void __ext4_error_file(struct file *file, const char *function,
456 unsigned int line, ext4_fsblk_t block,
457 const char *fmt, ...)
458 {
459 va_list args;
460 struct va_format vaf;
461 struct ext4_super_block *es;
462 struct inode *inode = file_inode(file);
463 char pathname[80], *path;
464
465 es = EXT4_SB(inode->i_sb)->s_es;
466 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
467 if (ext4_error_ratelimit(inode->i_sb)) {
468 path = file_path(file, pathname, sizeof(pathname));
469 if (IS_ERR(path))
470 path = "(unknown)";
471 va_start(args, fmt);
472 vaf.fmt = fmt;
473 vaf.va = &args;
474 if (block)
475 printk(KERN_CRIT
476 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
477 "block %llu: comm %s: path %s: %pV\n",
478 inode->i_sb->s_id, function, line, inode->i_ino,
479 block, current->comm, path, &vaf);
480 else
481 printk(KERN_CRIT
482 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
483 "comm %s: path %s: %pV\n",
484 inode->i_sb->s_id, function, line, inode->i_ino,
485 current->comm, path, &vaf);
486 va_end(args);
487 }
488 save_error_info(inode->i_sb, function, line);
489 ext4_handle_error(inode->i_sb);
490 }
491
492 const char *ext4_decode_error(struct super_block *sb, int errno,
493 char nbuf[16])
494 {
495 char *errstr = NULL;
496
497 switch (errno) {
498 case -EIO:
499 errstr = "IO failure";
500 break;
501 case -ENOMEM:
502 errstr = "Out of memory";
503 break;
504 case -EROFS:
505 if (!sb || (EXT4_SB(sb)->s_journal &&
506 EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT))
507 errstr = "Journal has aborted";
508 else
509 errstr = "Readonly filesystem";
510 break;
511 default:
512 /* If the caller passed in an extra buffer for unknown
513 * errors, textualise them now. Else we just return
514 * NULL. */
515 if (nbuf) {
516 /* Check for truncated error codes... */
517 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
518 errstr = nbuf;
519 }
520 break;
521 }
522
523 return errstr;
524 }
525
526 /* __ext4_std_error decodes expected errors from journaling functions
527 * automatically and invokes the appropriate error response. */
528
529 void __ext4_std_error(struct super_block *sb, const char *function,
530 unsigned int line, int errno)
531 {
532 char nbuf[16];
533 const char *errstr;
534
535 /* Special case: if the error is EROFS, and we're not already
536 * inside a transaction, then there's really no point in logging
537 * an error. */
538 if (errno == -EROFS && journal_current_handle() == NULL &&
539 (sb->s_flags & MS_RDONLY))
540 return;
541
542 if (ext4_error_ratelimit(sb)) {
543 errstr = ext4_decode_error(sb, errno, nbuf);
544 printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n",
545 sb->s_id, function, line, errstr);
546 }
547
548 save_error_info(sb, function, line);
549 ext4_handle_error(sb);
550 }
551
552 /*
553 * ext4_abort is a much stronger failure handler than ext4_error. The
554 * abort function may be used to deal with unrecoverable failures such
555 * as journal IO errors or ENOMEM at a critical moment in log management.
556 *
557 * We unconditionally force the filesystem into an ABORT|READONLY state,
558 * unless the error response on the fs has been set to panic in which
559 * case we take the easy way out and panic immediately.
560 */
561
562 void __ext4_abort(struct super_block *sb, const char *function,
563 unsigned int line, const char *fmt, ...)
564 {
565 va_list args;
566
567 save_error_info(sb, function, line);
568 va_start(args, fmt);
569 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: ", sb->s_id,
570 function, line);
571 vprintk(fmt, args);
572 printk("\n");
573 va_end(args);
574
575 if ((sb->s_flags & MS_RDONLY) == 0) {
576 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
577 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
578 /*
579 * Make sure updated value of ->s_mount_flags will be visible
580 * before ->s_flags update
581 */
582 smp_wmb();
583 sb->s_flags |= MS_RDONLY;
584 if (EXT4_SB(sb)->s_journal)
585 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
586 save_error_info(sb, function, line);
587 }
588 if (test_opt(sb, ERRORS_PANIC))
589 panic("EXT4-fs panic from previous error\n");
590 }
591
592 void __ext4_msg(struct super_block *sb,
593 const char *prefix, const char *fmt, ...)
594 {
595 struct va_format vaf;
596 va_list args;
597
598 if (!___ratelimit(&(EXT4_SB(sb)->s_msg_ratelimit_state), "EXT4-fs"))
599 return;
600
601 va_start(args, fmt);
602 vaf.fmt = fmt;
603 vaf.va = &args;
604 printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
605 va_end(args);
606 }
607
608 #define ext4_warning_ratelimit(sb) \
609 ___ratelimit(&(EXT4_SB(sb)->s_warning_ratelimit_state), \
610 "EXT4-fs warning")
611
612 void __ext4_warning(struct super_block *sb, const char *function,
613 unsigned int line, const char *fmt, ...)
614 {
615 struct va_format vaf;
616 va_list args;
617
618 if (!ext4_warning_ratelimit(sb))
619 return;
620
621 va_start(args, fmt);
622 vaf.fmt = fmt;
623 vaf.va = &args;
624 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: %pV\n",
625 sb->s_id, function, line, &vaf);
626 va_end(args);
627 }
628
629 void __ext4_warning_inode(const struct inode *inode, const char *function,
630 unsigned int line, const char *fmt, ...)
631 {
632 struct va_format vaf;
633 va_list args;
634
635 if (!ext4_warning_ratelimit(inode->i_sb))
636 return;
637
638 va_start(args, fmt);
639 vaf.fmt = fmt;
640 vaf.va = &args;
641 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: "
642 "inode #%lu: comm %s: %pV\n", inode->i_sb->s_id,
643 function, line, inode->i_ino, current->comm, &vaf);
644 va_end(args);
645 }
646
647 void __ext4_grp_locked_error(const char *function, unsigned int line,
648 struct super_block *sb, ext4_group_t grp,
649 unsigned long ino, ext4_fsblk_t block,
650 const char *fmt, ...)
651 __releases(bitlock)
652 __acquires(bitlock)
653 {
654 struct va_format vaf;
655 va_list args;
656 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
657
658 es->s_last_error_ino = cpu_to_le32(ino);
659 es->s_last_error_block = cpu_to_le64(block);
660 __save_error_info(sb, function, line);
661
662 if (ext4_error_ratelimit(sb)) {
663 va_start(args, fmt);
664 vaf.fmt = fmt;
665 vaf.va = &args;
666 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u, ",
667 sb->s_id, function, line, grp);
668 if (ino)
669 printk(KERN_CONT "inode %lu: ", ino);
670 if (block)
671 printk(KERN_CONT "block %llu:",
672 (unsigned long long) block);
673 printk(KERN_CONT "%pV\n", &vaf);
674 va_end(args);
675 }
676
677 if (test_opt(sb, ERRORS_CONT)) {
678 ext4_commit_super(sb, 0);
679 return;
680 }
681
682 ext4_unlock_group(sb, grp);
683 ext4_handle_error(sb);
684 /*
685 * We only get here in the ERRORS_RO case; relocking the group
686 * may be dangerous, but nothing bad will happen since the
687 * filesystem will have already been marked read/only and the
688 * journal has been aborted. We return 1 as a hint to callers
689 * who might what to use the return value from
690 * ext4_grp_locked_error() to distinguish between the
691 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
692 * aggressively from the ext4 function in question, with a
693 * more appropriate error code.
694 */
695 ext4_lock_group(sb, grp);
696 return;
697 }
698
699 void ext4_update_dynamic_rev(struct super_block *sb)
700 {
701 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
702
703 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
704 return;
705
706 ext4_warning(sb,
707 "updating to rev %d because of new feature flag, "
708 "running e2fsck is recommended",
709 EXT4_DYNAMIC_REV);
710
711 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
712 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
713 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
714 /* leave es->s_feature_*compat flags alone */
715 /* es->s_uuid will be set by e2fsck if empty */
716
717 /*
718 * The rest of the superblock fields should be zero, and if not it
719 * means they are likely already in use, so leave them alone. We
720 * can leave it up to e2fsck to clean up any inconsistencies there.
721 */
722 }
723
724 /*
725 * Open the external journal device
726 */
727 static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb)
728 {
729 struct block_device *bdev;
730 char b[BDEVNAME_SIZE];
731
732 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
733 if (IS_ERR(bdev))
734 goto fail;
735 return bdev;
736
737 fail:
738 ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld",
739 __bdevname(dev, b), PTR_ERR(bdev));
740 return NULL;
741 }
742
743 /*
744 * Release the journal device
745 */
746 static void ext4_blkdev_put(struct block_device *bdev)
747 {
748 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
749 }
750
751 static void ext4_blkdev_remove(struct ext4_sb_info *sbi)
752 {
753 struct block_device *bdev;
754 bdev = sbi->journal_bdev;
755 if (bdev) {
756 ext4_blkdev_put(bdev);
757 sbi->journal_bdev = NULL;
758 }
759 }
760
761 static inline struct inode *orphan_list_entry(struct list_head *l)
762 {
763 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
764 }
765
766 static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
767 {
768 struct list_head *l;
769
770 ext4_msg(sb, KERN_ERR, "sb orphan head is %d",
771 le32_to_cpu(sbi->s_es->s_last_orphan));
772
773 printk(KERN_ERR "sb_info orphan list:\n");
774 list_for_each(l, &sbi->s_orphan) {
775 struct inode *inode = orphan_list_entry(l);
776 printk(KERN_ERR " "
777 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
778 inode->i_sb->s_id, inode->i_ino, inode,
779 inode->i_mode, inode->i_nlink,
780 NEXT_ORPHAN(inode));
781 }
782 }
783
784 static void ext4_put_super(struct super_block *sb)
785 {
786 struct ext4_sb_info *sbi = EXT4_SB(sb);
787 struct ext4_super_block *es = sbi->s_es;
788 int i, err;
789
790 ext4_unregister_li_request(sb);
791 dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
792
793 flush_workqueue(sbi->rsv_conversion_wq);
794 destroy_workqueue(sbi->rsv_conversion_wq);
795
796 if (sbi->s_journal) {
797 err = jbd2_journal_destroy(sbi->s_journal);
798 sbi->s_journal = NULL;
799 if (err < 0)
800 ext4_abort(sb, "Couldn't clean up the journal");
801 }
802
803 ext4_es_unregister_shrinker(sbi);
804 del_timer_sync(&sbi->s_err_report);
805 ext4_release_system_zone(sb);
806 ext4_mb_release(sb);
807 ext4_ext_release(sb);
808 ext4_xattr_put_super(sb);
809
810 if (!(sb->s_flags & MS_RDONLY)) {
811 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
812 es->s_state = cpu_to_le16(sbi->s_mount_state);
813 }
814 if (!(sb->s_flags & MS_RDONLY))
815 ext4_commit_super(sb, 1);
816
817 if (sbi->s_proc) {
818 remove_proc_entry("options", sbi->s_proc);
819 remove_proc_entry(sb->s_id, ext4_proc_root);
820 }
821 kobject_del(&sbi->s_kobj);
822
823 for (i = 0; i < sbi->s_gdb_count; i++)
824 brelse(sbi->s_group_desc[i]);
825 kvfree(sbi->s_group_desc);
826 kvfree(sbi->s_flex_groups);
827 percpu_counter_destroy(&sbi->s_freeclusters_counter);
828 percpu_counter_destroy(&sbi->s_freeinodes_counter);
829 percpu_counter_destroy(&sbi->s_dirs_counter);
830 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
831 brelse(sbi->s_sbh);
832 #ifdef CONFIG_QUOTA
833 for (i = 0; i < EXT4_MAXQUOTAS; i++)
834 kfree(sbi->s_qf_names[i]);
835 #endif
836
837 /* Debugging code just in case the in-memory inode orphan list
838 * isn't empty. The on-disk one can be non-empty if we've
839 * detected an error and taken the fs readonly, but the
840 * in-memory list had better be clean by this point. */
841 if (!list_empty(&sbi->s_orphan))
842 dump_orphan_list(sb, sbi);
843 J_ASSERT(list_empty(&sbi->s_orphan));
844
845 sync_blockdev(sb->s_bdev);
846 invalidate_bdev(sb->s_bdev);
847 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
848 /*
849 * Invalidate the journal device's buffers. We don't want them
850 * floating about in memory - the physical journal device may
851 * hotswapped, and it breaks the `ro-after' testing code.
852 */
853 sync_blockdev(sbi->journal_bdev);
854 invalidate_bdev(sbi->journal_bdev);
855 ext4_blkdev_remove(sbi);
856 }
857 if (sbi->s_mb_cache) {
858 ext4_xattr_destroy_cache(sbi->s_mb_cache);
859 sbi->s_mb_cache = NULL;
860 }
861 if (sbi->s_mmp_tsk)
862 kthread_stop(sbi->s_mmp_tsk);
863 sb->s_fs_info = NULL;
864 /*
865 * Now that we are completely done shutting down the
866 * superblock, we need to actually destroy the kobject.
867 */
868 kobject_put(&sbi->s_kobj);
869 wait_for_completion(&sbi->s_kobj_unregister);
870 if (sbi->s_chksum_driver)
871 crypto_free_shash(sbi->s_chksum_driver);
872 kfree(sbi->s_blockgroup_lock);
873 kfree(sbi);
874 }
875
876 static struct kmem_cache *ext4_inode_cachep;
877
878 /*
879 * Called inside transaction, so use GFP_NOFS
880 */
881 static struct inode *ext4_alloc_inode(struct super_block *sb)
882 {
883 struct ext4_inode_info *ei;
884
885 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
886 if (!ei)
887 return NULL;
888
889 ei->vfs_inode.i_version = 1;
890 spin_lock_init(&ei->i_raw_lock);
891 INIT_LIST_HEAD(&ei->i_prealloc_list);
892 spin_lock_init(&ei->i_prealloc_lock);
893 ext4_es_init_tree(&ei->i_es_tree);
894 rwlock_init(&ei->i_es_lock);
895 INIT_LIST_HEAD(&ei->i_es_list);
896 ei->i_es_all_nr = 0;
897 ei->i_es_shk_nr = 0;
898 ei->i_es_shrink_lblk = 0;
899 ei->i_reserved_data_blocks = 0;
900 ei->i_reserved_meta_blocks = 0;
901 ei->i_allocated_meta_blocks = 0;
902 ei->i_da_metadata_calc_len = 0;
903 ei->i_da_metadata_calc_last_lblock = 0;
904 spin_lock_init(&(ei->i_block_reservation_lock));
905 #ifdef CONFIG_QUOTA
906 ei->i_reserved_quota = 0;
907 memset(&ei->i_dquot, 0, sizeof(ei->i_dquot));
908 #endif
909 ei->jinode = NULL;
910 INIT_LIST_HEAD(&ei->i_rsv_conversion_list);
911 spin_lock_init(&ei->i_completed_io_lock);
912 ei->i_sync_tid = 0;
913 ei->i_datasync_tid = 0;
914 atomic_set(&ei->i_ioend_count, 0);
915 atomic_set(&ei->i_unwritten, 0);
916 INIT_WORK(&ei->i_rsv_conversion_work, ext4_end_io_rsv_work);
917 #ifdef CONFIG_EXT4_FS_ENCRYPTION
918 ei->i_crypt_info = NULL;
919 #endif
920 return &ei->vfs_inode;
921 }
922
923 static int ext4_drop_inode(struct inode *inode)
924 {
925 int drop = generic_drop_inode(inode);
926
927 trace_ext4_drop_inode(inode, drop);
928 return drop;
929 }
930
931 static void ext4_i_callback(struct rcu_head *head)
932 {
933 struct inode *inode = container_of(head, struct inode, i_rcu);
934 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
935 }
936
937 static void ext4_destroy_inode(struct inode *inode)
938 {
939 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
940 ext4_msg(inode->i_sb, KERN_ERR,
941 "Inode %lu (%p): orphan list check failed!",
942 inode->i_ino, EXT4_I(inode));
943 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
944 EXT4_I(inode), sizeof(struct ext4_inode_info),
945 true);
946 dump_stack();
947 }
948 call_rcu(&inode->i_rcu, ext4_i_callback);
949 }
950
951 static void init_once(void *foo)
952 {
953 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
954
955 INIT_LIST_HEAD(&ei->i_orphan);
956 init_rwsem(&ei->xattr_sem);
957 init_rwsem(&ei->i_data_sem);
958 inode_init_once(&ei->vfs_inode);
959 }
960
961 static int __init init_inodecache(void)
962 {
963 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
964 sizeof(struct ext4_inode_info),
965 0, (SLAB_RECLAIM_ACCOUNT|
966 SLAB_MEM_SPREAD),
967 init_once);
968 if (ext4_inode_cachep == NULL)
969 return -ENOMEM;
970 return 0;
971 }
972
973 static void destroy_inodecache(void)
974 {
975 /*
976 * Make sure all delayed rcu free inodes are flushed before we
977 * destroy cache.
978 */
979 rcu_barrier();
980 kmem_cache_destroy(ext4_inode_cachep);
981 }
982
983 void ext4_clear_inode(struct inode *inode)
984 {
985 invalidate_inode_buffers(inode);
986 clear_inode(inode);
987 dquot_drop(inode);
988 ext4_discard_preallocations(inode);
989 ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS);
990 if (EXT4_I(inode)->jinode) {
991 jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode),
992 EXT4_I(inode)->jinode);
993 jbd2_free_inode(EXT4_I(inode)->jinode);
994 EXT4_I(inode)->jinode = NULL;
995 }
996 #ifdef CONFIG_EXT4_FS_ENCRYPTION
997 if (EXT4_I(inode)->i_crypt_info)
998 ext4_free_encryption_info(inode, EXT4_I(inode)->i_crypt_info);
999 #endif
1000 }
1001
1002 static struct inode *ext4_nfs_get_inode(struct super_block *sb,
1003 u64 ino, u32 generation)
1004 {
1005 struct inode *inode;
1006
1007 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
1008 return ERR_PTR(-ESTALE);
1009 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
1010 return ERR_PTR(-ESTALE);
1011
1012 /* iget isn't really right if the inode is currently unallocated!!
1013 *
1014 * ext4_read_inode will return a bad_inode if the inode had been
1015 * deleted, so we should be safe.
1016 *
1017 * Currently we don't know the generation for parent directory, so
1018 * a generation of 0 means "accept any"
1019 */
1020 inode = ext4_iget_normal(sb, ino);
1021 if (IS_ERR(inode))
1022 return ERR_CAST(inode);
1023 if (generation && inode->i_generation != generation) {
1024 iput(inode);
1025 return ERR_PTR(-ESTALE);
1026 }
1027
1028 return inode;
1029 }
1030
1031 static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
1032 int fh_len, int fh_type)
1033 {
1034 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
1035 ext4_nfs_get_inode);
1036 }
1037
1038 static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
1039 int fh_len, int fh_type)
1040 {
1041 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
1042 ext4_nfs_get_inode);
1043 }
1044
1045 /*
1046 * Try to release metadata pages (indirect blocks, directories) which are
1047 * mapped via the block device. Since these pages could have journal heads
1048 * which would prevent try_to_free_buffers() from freeing them, we must use
1049 * jbd2 layer's try_to_free_buffers() function to release them.
1050 */
1051 static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
1052 gfp_t wait)
1053 {
1054 journal_t *journal = EXT4_SB(sb)->s_journal;
1055
1056 WARN_ON(PageChecked(page));
1057 if (!page_has_buffers(page))
1058 return 0;
1059 if (journal)
1060 return jbd2_journal_try_to_free_buffers(journal, page,
1061 wait & ~__GFP_WAIT);
1062 return try_to_free_buffers(page);
1063 }
1064
1065 #ifdef CONFIG_QUOTA
1066 #define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
1067 #define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
1068
1069 static int ext4_write_dquot(struct dquot *dquot);
1070 static int ext4_acquire_dquot(struct dquot *dquot);
1071 static int ext4_release_dquot(struct dquot *dquot);
1072 static int ext4_mark_dquot_dirty(struct dquot *dquot);
1073 static int ext4_write_info(struct super_block *sb, int type);
1074 static int ext4_quota_on(struct super_block *sb, int type, int format_id,
1075 struct path *path);
1076 static int ext4_quota_off(struct super_block *sb, int type);
1077 static int ext4_quota_on_mount(struct super_block *sb, int type);
1078 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
1079 size_t len, loff_t off);
1080 static ssize_t ext4_quota_write(struct super_block *sb, int type,
1081 const char *data, size_t len, loff_t off);
1082 static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
1083 unsigned int flags);
1084 static int ext4_enable_quotas(struct super_block *sb);
1085
1086 static struct dquot **ext4_get_dquots(struct inode *inode)
1087 {
1088 return EXT4_I(inode)->i_dquot;
1089 }
1090
1091 static const struct dquot_operations ext4_quota_operations = {
1092 .get_reserved_space = ext4_get_reserved_space,
1093 .write_dquot = ext4_write_dquot,
1094 .acquire_dquot = ext4_acquire_dquot,
1095 .release_dquot = ext4_release_dquot,
1096 .mark_dirty = ext4_mark_dquot_dirty,
1097 .write_info = ext4_write_info,
1098 .alloc_dquot = dquot_alloc,
1099 .destroy_dquot = dquot_destroy,
1100 };
1101
1102 static const struct quotactl_ops ext4_qctl_operations = {
1103 .quota_on = ext4_quota_on,
1104 .quota_off = ext4_quota_off,
1105 .quota_sync = dquot_quota_sync,
1106 .get_state = dquot_get_state,
1107 .set_info = dquot_set_dqinfo,
1108 .get_dqblk = dquot_get_dqblk,
1109 .set_dqblk = dquot_set_dqblk
1110 };
1111 #endif
1112
1113 static const struct super_operations ext4_sops = {
1114 .alloc_inode = ext4_alloc_inode,
1115 .destroy_inode = ext4_destroy_inode,
1116 .write_inode = ext4_write_inode,
1117 .dirty_inode = ext4_dirty_inode,
1118 .drop_inode = ext4_drop_inode,
1119 .evict_inode = ext4_evict_inode,
1120 .put_super = ext4_put_super,
1121 .sync_fs = ext4_sync_fs,
1122 .freeze_fs = ext4_freeze,
1123 .unfreeze_fs = ext4_unfreeze,
1124 .statfs = ext4_statfs,
1125 .remount_fs = ext4_remount,
1126 .show_options = ext4_show_options,
1127 #ifdef CONFIG_QUOTA
1128 .quota_read = ext4_quota_read,
1129 .quota_write = ext4_quota_write,
1130 .get_dquots = ext4_get_dquots,
1131 #endif
1132 .bdev_try_to_free_page = bdev_try_to_free_page,
1133 };
1134
1135 static const struct export_operations ext4_export_ops = {
1136 .fh_to_dentry = ext4_fh_to_dentry,
1137 .fh_to_parent = ext4_fh_to_parent,
1138 .get_parent = ext4_get_parent,
1139 };
1140
1141 enum {
1142 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
1143 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
1144 Opt_nouid32, Opt_debug, Opt_removed,
1145 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
1146 Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload,
1147 Opt_commit, Opt_min_batch_time, Opt_max_batch_time, Opt_journal_dev,
1148 Opt_journal_path, Opt_journal_checksum, Opt_journal_async_commit,
1149 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
1150 Opt_data_err_abort, Opt_data_err_ignore, Opt_test_dummy_encryption,
1151 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
1152 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
1153 Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err,
1154 Opt_usrquota, Opt_grpquota, Opt_i_version, Opt_dax,
1155 Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_mblk_io_submit,
1156 Opt_lazytime, Opt_nolazytime,
1157 Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity,
1158 Opt_inode_readahead_blks, Opt_journal_ioprio,
1159 Opt_dioread_nolock, Opt_dioread_lock,
1160 Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable,
1161 Opt_max_dir_size_kb, Opt_nojournal_checksum,
1162 };
1163
1164 static const match_table_t tokens = {
1165 {Opt_bsd_df, "bsddf"},
1166 {Opt_minix_df, "minixdf"},
1167 {Opt_grpid, "grpid"},
1168 {Opt_grpid, "bsdgroups"},
1169 {Opt_nogrpid, "nogrpid"},
1170 {Opt_nogrpid, "sysvgroups"},
1171 {Opt_resgid, "resgid=%u"},
1172 {Opt_resuid, "resuid=%u"},
1173 {Opt_sb, "sb=%u"},
1174 {Opt_err_cont, "errors=continue"},
1175 {Opt_err_panic, "errors=panic"},
1176 {Opt_err_ro, "errors=remount-ro"},
1177 {Opt_nouid32, "nouid32"},
1178 {Opt_debug, "debug"},
1179 {Opt_removed, "oldalloc"},
1180 {Opt_removed, "orlov"},
1181 {Opt_user_xattr, "user_xattr"},
1182 {Opt_nouser_xattr, "nouser_xattr"},
1183 {Opt_acl, "acl"},
1184 {Opt_noacl, "noacl"},
1185 {Opt_noload, "norecovery"},
1186 {Opt_noload, "noload"},
1187 {Opt_removed, "nobh"},
1188 {Opt_removed, "bh"},
1189 {Opt_commit, "commit=%u"},
1190 {Opt_min_batch_time, "min_batch_time=%u"},
1191 {Opt_max_batch_time, "max_batch_time=%u"},
1192 {Opt_journal_dev, "journal_dev=%u"},
1193 {Opt_journal_path, "journal_path=%s"},
1194 {Opt_journal_checksum, "journal_checksum"},
1195 {Opt_nojournal_checksum, "nojournal_checksum"},
1196 {Opt_journal_async_commit, "journal_async_commit"},
1197 {Opt_abort, "abort"},
1198 {Opt_data_journal, "data=journal"},
1199 {Opt_data_ordered, "data=ordered"},
1200 {Opt_data_writeback, "data=writeback"},
1201 {Opt_data_err_abort, "data_err=abort"},
1202 {Opt_data_err_ignore, "data_err=ignore"},
1203 {Opt_offusrjquota, "usrjquota="},
1204 {Opt_usrjquota, "usrjquota=%s"},
1205 {Opt_offgrpjquota, "grpjquota="},
1206 {Opt_grpjquota, "grpjquota=%s"},
1207 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
1208 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
1209 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
1210 {Opt_grpquota, "grpquota"},
1211 {Opt_noquota, "noquota"},
1212 {Opt_quota, "quota"},
1213 {Opt_usrquota, "usrquota"},
1214 {Opt_barrier, "barrier=%u"},
1215 {Opt_barrier, "barrier"},
1216 {Opt_nobarrier, "nobarrier"},
1217 {Opt_i_version, "i_version"},
1218 {Opt_dax, "dax"},
1219 {Opt_stripe, "stripe=%u"},
1220 {Opt_delalloc, "delalloc"},
1221 {Opt_lazytime, "lazytime"},
1222 {Opt_nolazytime, "nolazytime"},
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_test_dummy_encryption, "test_dummy_encryption"},
1242 {Opt_removed, "check=none"}, /* mount option from ext2/3 */
1243 {Opt_removed, "nocheck"}, /* mount option from ext2/3 */
1244 {Opt_removed, "reservation"}, /* mount option from ext2/3 */
1245 {Opt_removed, "noreservation"}, /* mount option from ext2/3 */
1246 {Opt_removed, "journal=%u"}, /* mount option from ext2/3 */
1247 {Opt_err, NULL},
1248 };
1249
1250 static ext4_fsblk_t get_sb_block(void **data)
1251 {
1252 ext4_fsblk_t sb_block;
1253 char *options = (char *) *data;
1254
1255 if (!options || strncmp(options, "sb=", 3) != 0)
1256 return 1; /* Default location */
1257
1258 options += 3;
1259 /* TODO: use simple_strtoll with >32bit ext4 */
1260 sb_block = simple_strtoul(options, &options, 0);
1261 if (*options && *options != ',') {
1262 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
1263 (char *) *data);
1264 return 1;
1265 }
1266 if (*options == ',')
1267 options++;
1268 *data = (void *) options;
1269
1270 return sb_block;
1271 }
1272
1273 #define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
1274 static char deprecated_msg[] = "Mount option \"%s\" will be removed by %s\n"
1275 "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
1276
1277 #ifdef CONFIG_QUOTA
1278 static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
1279 {
1280 struct ext4_sb_info *sbi = EXT4_SB(sb);
1281 char *qname;
1282 int ret = -1;
1283
1284 if (sb_any_quota_loaded(sb) &&
1285 !sbi->s_qf_names[qtype]) {
1286 ext4_msg(sb, KERN_ERR,
1287 "Cannot change journaled "
1288 "quota options when quota turned on");
1289 return -1;
1290 }
1291 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA)) {
1292 ext4_msg(sb, KERN_ERR, "Cannot set journaled quota options "
1293 "when QUOTA feature is enabled");
1294 return -1;
1295 }
1296 qname = match_strdup(args);
1297 if (!qname) {
1298 ext4_msg(sb, KERN_ERR,
1299 "Not enough memory for storing quotafile name");
1300 return -1;
1301 }
1302 if (sbi->s_qf_names[qtype]) {
1303 if (strcmp(sbi->s_qf_names[qtype], qname) == 0)
1304 ret = 1;
1305 else
1306 ext4_msg(sb, KERN_ERR,
1307 "%s quota file already specified",
1308 QTYPE2NAME(qtype));
1309 goto errout;
1310 }
1311 if (strchr(qname, '/')) {
1312 ext4_msg(sb, KERN_ERR,
1313 "quotafile must be on filesystem root");
1314 goto errout;
1315 }
1316 sbi->s_qf_names[qtype] = qname;
1317 set_opt(sb, QUOTA);
1318 return 1;
1319 errout:
1320 kfree(qname);
1321 return ret;
1322 }
1323
1324 static int clear_qf_name(struct super_block *sb, int qtype)
1325 {
1326
1327 struct ext4_sb_info *sbi = EXT4_SB(sb);
1328
1329 if (sb_any_quota_loaded(sb) &&
1330 sbi->s_qf_names[qtype]) {
1331 ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options"
1332 " when quota turned on");
1333 return -1;
1334 }
1335 kfree(sbi->s_qf_names[qtype]);
1336 sbi->s_qf_names[qtype] = NULL;
1337 return 1;
1338 }
1339 #endif
1340
1341 #define MOPT_SET 0x0001
1342 #define MOPT_CLEAR 0x0002
1343 #define MOPT_NOSUPPORT 0x0004
1344 #define MOPT_EXPLICIT 0x0008
1345 #define MOPT_CLEAR_ERR 0x0010
1346 #define MOPT_GTE0 0x0020
1347 #ifdef CONFIG_QUOTA
1348 #define MOPT_Q 0
1349 #define MOPT_QFMT 0x0040
1350 #else
1351 #define MOPT_Q MOPT_NOSUPPORT
1352 #define MOPT_QFMT MOPT_NOSUPPORT
1353 #endif
1354 #define MOPT_DATAJ 0x0080
1355 #define MOPT_NO_EXT2 0x0100
1356 #define MOPT_NO_EXT3 0x0200
1357 #define MOPT_EXT4_ONLY (MOPT_NO_EXT2 | MOPT_NO_EXT3)
1358 #define MOPT_STRING 0x0400
1359
1360 static const struct mount_opts {
1361 int token;
1362 int mount_opt;
1363 int flags;
1364 } ext4_mount_opts[] = {
1365 {Opt_minix_df, EXT4_MOUNT_MINIX_DF, MOPT_SET},
1366 {Opt_bsd_df, EXT4_MOUNT_MINIX_DF, MOPT_CLEAR},
1367 {Opt_grpid, EXT4_MOUNT_GRPID, MOPT_SET},
1368 {Opt_nogrpid, EXT4_MOUNT_GRPID, MOPT_CLEAR},
1369 {Opt_block_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_SET},
1370 {Opt_noblock_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_CLEAR},
1371 {Opt_dioread_nolock, EXT4_MOUNT_DIOREAD_NOLOCK,
1372 MOPT_EXT4_ONLY | MOPT_SET},
1373 {Opt_dioread_lock, EXT4_MOUNT_DIOREAD_NOLOCK,
1374 MOPT_EXT4_ONLY | MOPT_CLEAR},
1375 {Opt_discard, EXT4_MOUNT_DISCARD, MOPT_SET},
1376 {Opt_nodiscard, EXT4_MOUNT_DISCARD, MOPT_CLEAR},
1377 {Opt_delalloc, EXT4_MOUNT_DELALLOC,
1378 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
1379 {Opt_nodelalloc, EXT4_MOUNT_DELALLOC,
1380 MOPT_EXT4_ONLY | MOPT_CLEAR},
1381 {Opt_nojournal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
1382 MOPT_EXT4_ONLY | MOPT_CLEAR},
1383 {Opt_journal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
1384 MOPT_EXT4_ONLY | MOPT_SET},
1385 {Opt_journal_async_commit, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT |
1386 EXT4_MOUNT_JOURNAL_CHECKSUM),
1387 MOPT_EXT4_ONLY | MOPT_SET},
1388 {Opt_noload, EXT4_MOUNT_NOLOAD, MOPT_NO_EXT2 | MOPT_SET},
1389 {Opt_err_panic, EXT4_MOUNT_ERRORS_PANIC, MOPT_SET | MOPT_CLEAR_ERR},
1390 {Opt_err_ro, EXT4_MOUNT_ERRORS_RO, MOPT_SET | MOPT_CLEAR_ERR},
1391 {Opt_err_cont, EXT4_MOUNT_ERRORS_CONT, MOPT_SET | MOPT_CLEAR_ERR},
1392 {Opt_data_err_abort, EXT4_MOUNT_DATA_ERR_ABORT,
1393 MOPT_NO_EXT2 | MOPT_SET},
1394 {Opt_data_err_ignore, EXT4_MOUNT_DATA_ERR_ABORT,
1395 MOPT_NO_EXT2 | MOPT_CLEAR},
1396 {Opt_barrier, EXT4_MOUNT_BARRIER, MOPT_SET},
1397 {Opt_nobarrier, EXT4_MOUNT_BARRIER, MOPT_CLEAR},
1398 {Opt_noauto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_SET},
1399 {Opt_auto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_CLEAR},
1400 {Opt_noinit_itable, EXT4_MOUNT_INIT_INODE_TABLE, MOPT_CLEAR},
1401 {Opt_commit, 0, MOPT_GTE0},
1402 {Opt_max_batch_time, 0, MOPT_GTE0},
1403 {Opt_min_batch_time, 0, MOPT_GTE0},
1404 {Opt_inode_readahead_blks, 0, MOPT_GTE0},
1405 {Opt_init_itable, 0, MOPT_GTE0},
1406 {Opt_dax, EXT4_MOUNT_DAX, MOPT_SET},
1407 {Opt_stripe, 0, MOPT_GTE0},
1408 {Opt_resuid, 0, MOPT_GTE0},
1409 {Opt_resgid, 0, MOPT_GTE0},
1410 {Opt_journal_dev, 0, MOPT_NO_EXT2 | MOPT_GTE0},
1411 {Opt_journal_path, 0, MOPT_NO_EXT2 | MOPT_STRING},
1412 {Opt_journal_ioprio, 0, MOPT_NO_EXT2 | MOPT_GTE0},
1413 {Opt_data_journal, EXT4_MOUNT_JOURNAL_DATA, MOPT_NO_EXT2 | MOPT_DATAJ},
1414 {Opt_data_ordered, EXT4_MOUNT_ORDERED_DATA, MOPT_NO_EXT2 | MOPT_DATAJ},
1415 {Opt_data_writeback, EXT4_MOUNT_WRITEBACK_DATA,
1416 MOPT_NO_EXT2 | MOPT_DATAJ},
1417 {Opt_user_xattr, EXT4_MOUNT_XATTR_USER, MOPT_SET},
1418 {Opt_nouser_xattr, EXT4_MOUNT_XATTR_USER, MOPT_CLEAR},
1419 #ifdef CONFIG_EXT4_FS_POSIX_ACL
1420 {Opt_acl, EXT4_MOUNT_POSIX_ACL, MOPT_SET},
1421 {Opt_noacl, EXT4_MOUNT_POSIX_ACL, MOPT_CLEAR},
1422 #else
1423 {Opt_acl, 0, MOPT_NOSUPPORT},
1424 {Opt_noacl, 0, MOPT_NOSUPPORT},
1425 #endif
1426 {Opt_nouid32, EXT4_MOUNT_NO_UID32, MOPT_SET},
1427 {Opt_debug, EXT4_MOUNT_DEBUG, MOPT_SET},
1428 {Opt_quota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA, MOPT_SET | MOPT_Q},
1429 {Opt_usrquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA,
1430 MOPT_SET | MOPT_Q},
1431 {Opt_grpquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_GRPQUOTA,
1432 MOPT_SET | MOPT_Q},
1433 {Opt_noquota, (EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA |
1434 EXT4_MOUNT_GRPQUOTA), MOPT_CLEAR | MOPT_Q},
1435 {Opt_usrjquota, 0, MOPT_Q},
1436 {Opt_grpjquota, 0, MOPT_Q},
1437 {Opt_offusrjquota, 0, MOPT_Q},
1438 {Opt_offgrpjquota, 0, MOPT_Q},
1439 {Opt_jqfmt_vfsold, QFMT_VFS_OLD, MOPT_QFMT},
1440 {Opt_jqfmt_vfsv0, QFMT_VFS_V0, MOPT_QFMT},
1441 {Opt_jqfmt_vfsv1, QFMT_VFS_V1, MOPT_QFMT},
1442 {Opt_max_dir_size_kb, 0, MOPT_GTE0},
1443 {Opt_test_dummy_encryption, 0, MOPT_GTE0},
1444 {Opt_err, 0, 0}
1445 };
1446
1447 static int handle_mount_opt(struct super_block *sb, char *opt, int token,
1448 substring_t *args, unsigned long *journal_devnum,
1449 unsigned int *journal_ioprio, int is_remount)
1450 {
1451 struct ext4_sb_info *sbi = EXT4_SB(sb);
1452 const struct mount_opts *m;
1453 kuid_t uid;
1454 kgid_t gid;
1455 int arg = 0;
1456
1457 #ifdef CONFIG_QUOTA
1458 if (token == Opt_usrjquota)
1459 return set_qf_name(sb, USRQUOTA, &args[0]);
1460 else if (token == Opt_grpjquota)
1461 return set_qf_name(sb, GRPQUOTA, &args[0]);
1462 else if (token == Opt_offusrjquota)
1463 return clear_qf_name(sb, USRQUOTA);
1464 else if (token == Opt_offgrpjquota)
1465 return clear_qf_name(sb, GRPQUOTA);
1466 #endif
1467 switch (token) {
1468 case Opt_noacl:
1469 case Opt_nouser_xattr:
1470 ext4_msg(sb, KERN_WARNING, deprecated_msg, opt, "3.5");
1471 break;
1472 case Opt_sb:
1473 return 1; /* handled by get_sb_block() */
1474 case Opt_removed:
1475 ext4_msg(sb, KERN_WARNING, "Ignoring removed %s option", opt);
1476 return 1;
1477 case Opt_abort:
1478 sbi->s_mount_flags |= EXT4_MF_FS_ABORTED;
1479 return 1;
1480 case Opt_i_version:
1481 sb->s_flags |= MS_I_VERSION;
1482 return 1;
1483 case Opt_lazytime:
1484 sb->s_flags |= MS_LAZYTIME;
1485 return 1;
1486 case Opt_nolazytime:
1487 sb->s_flags &= ~MS_LAZYTIME;
1488 return 1;
1489 }
1490
1491 for (m = ext4_mount_opts; m->token != Opt_err; m++)
1492 if (token == m->token)
1493 break;
1494
1495 if (m->token == Opt_err) {
1496 ext4_msg(sb, KERN_ERR, "Unrecognized mount option \"%s\" "
1497 "or missing value", opt);
1498 return -1;
1499 }
1500
1501 if ((m->flags & MOPT_NO_EXT2) && IS_EXT2_SB(sb)) {
1502 ext4_msg(sb, KERN_ERR,
1503 "Mount option \"%s\" incompatible with ext2", opt);
1504 return -1;
1505 }
1506 if ((m->flags & MOPT_NO_EXT3) && IS_EXT3_SB(sb)) {
1507 ext4_msg(sb, KERN_ERR,
1508 "Mount option \"%s\" incompatible with ext3", opt);
1509 return -1;
1510 }
1511
1512 if (args->from && !(m->flags & MOPT_STRING) && match_int(args, &arg))
1513 return -1;
1514 if (args->from && (m->flags & MOPT_GTE0) && (arg < 0))
1515 return -1;
1516 if (m->flags & MOPT_EXPLICIT)
1517 set_opt2(sb, EXPLICIT_DELALLOC);
1518 if (m->flags & MOPT_CLEAR_ERR)
1519 clear_opt(sb, ERRORS_MASK);
1520 if (token == Opt_noquota && sb_any_quota_loaded(sb)) {
1521 ext4_msg(sb, KERN_ERR, "Cannot change quota "
1522 "options when quota turned on");
1523 return -1;
1524 }
1525
1526 if (m->flags & MOPT_NOSUPPORT) {
1527 ext4_msg(sb, KERN_ERR, "%s option not supported", opt);
1528 } else if (token == Opt_commit) {
1529 if (arg == 0)
1530 arg = JBD2_DEFAULT_MAX_COMMIT_AGE;
1531 sbi->s_commit_interval = HZ * arg;
1532 } else if (token == Opt_max_batch_time) {
1533 sbi->s_max_batch_time = arg;
1534 } else if (token == Opt_min_batch_time) {
1535 sbi->s_min_batch_time = arg;
1536 } else if (token == Opt_inode_readahead_blks) {
1537 if (arg && (arg > (1 << 30) || !is_power_of_2(arg))) {
1538 ext4_msg(sb, KERN_ERR,
1539 "EXT4-fs: inode_readahead_blks must be "
1540 "0 or a power of 2 smaller than 2^31");
1541 return -1;
1542 }
1543 sbi->s_inode_readahead_blks = arg;
1544 } else if (token == Opt_init_itable) {
1545 set_opt(sb, INIT_INODE_TABLE);
1546 if (!args->from)
1547 arg = EXT4_DEF_LI_WAIT_MULT;
1548 sbi->s_li_wait_mult = arg;
1549 } else if (token == Opt_max_dir_size_kb) {
1550 sbi->s_max_dir_size_kb = arg;
1551 } else if (token == Opt_stripe) {
1552 sbi->s_stripe = arg;
1553 } else if (token == Opt_resuid) {
1554 uid = make_kuid(current_user_ns(), arg);
1555 if (!uid_valid(uid)) {
1556 ext4_msg(sb, KERN_ERR, "Invalid uid value %d", arg);
1557 return -1;
1558 }
1559 sbi->s_resuid = uid;
1560 } else if (token == Opt_resgid) {
1561 gid = make_kgid(current_user_ns(), arg);
1562 if (!gid_valid(gid)) {
1563 ext4_msg(sb, KERN_ERR, "Invalid gid value %d", arg);
1564 return -1;
1565 }
1566 sbi->s_resgid = gid;
1567 } else if (token == Opt_journal_dev) {
1568 if (is_remount) {
1569 ext4_msg(sb, KERN_ERR,
1570 "Cannot specify journal on remount");
1571 return -1;
1572 }
1573 *journal_devnum = arg;
1574 } else if (token == Opt_journal_path) {
1575 char *journal_path;
1576 struct inode *journal_inode;
1577 struct path path;
1578 int error;
1579
1580 if (is_remount) {
1581 ext4_msg(sb, KERN_ERR,
1582 "Cannot specify journal on remount");
1583 return -1;
1584 }
1585 journal_path = match_strdup(&args[0]);
1586 if (!journal_path) {
1587 ext4_msg(sb, KERN_ERR, "error: could not dup "
1588 "journal device string");
1589 return -1;
1590 }
1591
1592 error = kern_path(journal_path, LOOKUP_FOLLOW, &path);
1593 if (error) {
1594 ext4_msg(sb, KERN_ERR, "error: could not find "
1595 "journal device path: error %d", error);
1596 kfree(journal_path);
1597 return -1;
1598 }
1599
1600 journal_inode = d_inode(path.dentry);
1601 if (!S_ISBLK(journal_inode->i_mode)) {
1602 ext4_msg(sb, KERN_ERR, "error: journal path %s "
1603 "is not a block device", journal_path);
1604 path_put(&path);
1605 kfree(journal_path);
1606 return -1;
1607 }
1608
1609 *journal_devnum = new_encode_dev(journal_inode->i_rdev);
1610 path_put(&path);
1611 kfree(journal_path);
1612 } else if (token == Opt_journal_ioprio) {
1613 if (arg > 7) {
1614 ext4_msg(sb, KERN_ERR, "Invalid journal IO priority"
1615 " (must be 0-7)");
1616 return -1;
1617 }
1618 *journal_ioprio =
1619 IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, arg);
1620 } else if (token == Opt_test_dummy_encryption) {
1621 #ifdef CONFIG_EXT4_FS_ENCRYPTION
1622 sbi->s_mount_flags |= EXT4_MF_TEST_DUMMY_ENCRYPTION;
1623 ext4_msg(sb, KERN_WARNING,
1624 "Test dummy encryption mode enabled");
1625 #else
1626 ext4_msg(sb, KERN_WARNING,
1627 "Test dummy encryption mount option ignored");
1628 #endif
1629 } else if (m->flags & MOPT_DATAJ) {
1630 if (is_remount) {
1631 if (!sbi->s_journal)
1632 ext4_msg(sb, KERN_WARNING, "Remounting file system with no journal so ignoring journalled data option");
1633 else if (test_opt(sb, DATA_FLAGS) != m->mount_opt) {
1634 ext4_msg(sb, KERN_ERR,
1635 "Cannot change data mode on remount");
1636 return -1;
1637 }
1638 } else {
1639 clear_opt(sb, DATA_FLAGS);
1640 sbi->s_mount_opt |= m->mount_opt;
1641 }
1642 #ifdef CONFIG_QUOTA
1643 } else if (m->flags & MOPT_QFMT) {
1644 if (sb_any_quota_loaded(sb) &&
1645 sbi->s_jquota_fmt != m->mount_opt) {
1646 ext4_msg(sb, KERN_ERR, "Cannot change journaled "
1647 "quota options when quota turned on");
1648 return -1;
1649 }
1650 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
1651 EXT4_FEATURE_RO_COMPAT_QUOTA)) {
1652 ext4_msg(sb, KERN_ERR,
1653 "Cannot set journaled quota options "
1654 "when QUOTA feature is enabled");
1655 return -1;
1656 }
1657 sbi->s_jquota_fmt = m->mount_opt;
1658 #endif
1659 #ifndef CONFIG_FS_DAX
1660 } else if (token == Opt_dax) {
1661 ext4_msg(sb, KERN_INFO, "dax option not supported");
1662 return -1;
1663 #endif
1664 } else {
1665 if (!args->from)
1666 arg = 1;
1667 if (m->flags & MOPT_CLEAR)
1668 arg = !arg;
1669 else if (unlikely(!(m->flags & MOPT_SET))) {
1670 ext4_msg(sb, KERN_WARNING,
1671 "buggy handling of option %s", opt);
1672 WARN_ON(1);
1673 return -1;
1674 }
1675 if (arg != 0)
1676 sbi->s_mount_opt |= m->mount_opt;
1677 else
1678 sbi->s_mount_opt &= ~m->mount_opt;
1679 }
1680 return 1;
1681 }
1682
1683 static int parse_options(char *options, struct super_block *sb,
1684 unsigned long *journal_devnum,
1685 unsigned int *journal_ioprio,
1686 int is_remount)
1687 {
1688 struct ext4_sb_info *sbi = EXT4_SB(sb);
1689 char *p;
1690 substring_t args[MAX_OPT_ARGS];
1691 int token;
1692
1693 if (!options)
1694 return 1;
1695
1696 while ((p = strsep(&options, ",")) != NULL) {
1697 if (!*p)
1698 continue;
1699 /*
1700 * Initialize args struct so we know whether arg was
1701 * found; some options take optional arguments.
1702 */
1703 args[0].to = args[0].from = NULL;
1704 token = match_token(p, tokens, args);
1705 if (handle_mount_opt(sb, p, token, args, journal_devnum,
1706 journal_ioprio, is_remount) < 0)
1707 return 0;
1708 }
1709 #ifdef CONFIG_QUOTA
1710 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) &&
1711 (test_opt(sb, USRQUOTA) || test_opt(sb, GRPQUOTA))) {
1712 ext4_msg(sb, KERN_ERR, "Cannot set quota options when QUOTA "
1713 "feature is enabled");
1714 return 0;
1715 }
1716 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1717 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
1718 clear_opt(sb, USRQUOTA);
1719
1720 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
1721 clear_opt(sb, GRPQUOTA);
1722
1723 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
1724 ext4_msg(sb, KERN_ERR, "old and new quota "
1725 "format mixing");
1726 return 0;
1727 }
1728
1729 if (!sbi->s_jquota_fmt) {
1730 ext4_msg(sb, KERN_ERR, "journaled quota format "
1731 "not specified");
1732 return 0;
1733 }
1734 }
1735 #endif
1736 if (test_opt(sb, DIOREAD_NOLOCK)) {
1737 int blocksize =
1738 BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);
1739
1740 if (blocksize < PAGE_CACHE_SIZE) {
1741 ext4_msg(sb, KERN_ERR, "can't mount with "
1742 "dioread_nolock if block size != PAGE_SIZE");
1743 return 0;
1744 }
1745 }
1746 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA &&
1747 test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
1748 ext4_msg(sb, KERN_ERR, "can't mount with journal_async_commit "
1749 "in data=ordered mode");
1750 return 0;
1751 }
1752 return 1;
1753 }
1754
1755 static inline void ext4_show_quota_options(struct seq_file *seq,
1756 struct super_block *sb)
1757 {
1758 #if defined(CONFIG_QUOTA)
1759 struct ext4_sb_info *sbi = EXT4_SB(sb);
1760
1761 if (sbi->s_jquota_fmt) {
1762 char *fmtname = "";
1763
1764 switch (sbi->s_jquota_fmt) {
1765 case QFMT_VFS_OLD:
1766 fmtname = "vfsold";
1767 break;
1768 case QFMT_VFS_V0:
1769 fmtname = "vfsv0";
1770 break;
1771 case QFMT_VFS_V1:
1772 fmtname = "vfsv1";
1773 break;
1774 }
1775 seq_printf(seq, ",jqfmt=%s", fmtname);
1776 }
1777
1778 if (sbi->s_qf_names[USRQUOTA])
1779 seq_show_option(seq, "usrjquota", sbi->s_qf_names[USRQUOTA]);
1780
1781 if (sbi->s_qf_names[GRPQUOTA])
1782 seq_show_option(seq, "grpjquota", sbi->s_qf_names[GRPQUOTA]);
1783 #endif
1784 }
1785
1786 static const char *token2str(int token)
1787 {
1788 const struct match_token *t;
1789
1790 for (t = tokens; t->token != Opt_err; t++)
1791 if (t->token == token && !strchr(t->pattern, '='))
1792 break;
1793 return t->pattern;
1794 }
1795
1796 /*
1797 * Show an option if
1798 * - it's set to a non-default value OR
1799 * - if the per-sb default is different from the global default
1800 */
1801 static int _ext4_show_options(struct seq_file *seq, struct super_block *sb,
1802 int nodefs)
1803 {
1804 struct ext4_sb_info *sbi = EXT4_SB(sb);
1805 struct ext4_super_block *es = sbi->s_es;
1806 int def_errors, def_mount_opt = nodefs ? 0 : sbi->s_def_mount_opt;
1807 const struct mount_opts *m;
1808 char sep = nodefs ? '\n' : ',';
1809
1810 #define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep)
1811 #define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg)
1812
1813 if (sbi->s_sb_block != 1)
1814 SEQ_OPTS_PRINT("sb=%llu", sbi->s_sb_block);
1815
1816 for (m = ext4_mount_opts; m->token != Opt_err; m++) {
1817 int want_set = m->flags & MOPT_SET;
1818 if (((m->flags & (MOPT_SET|MOPT_CLEAR)) == 0) ||
1819 (m->flags & MOPT_CLEAR_ERR))
1820 continue;
1821 if (!(m->mount_opt & (sbi->s_mount_opt ^ def_mount_opt)))
1822 continue; /* skip if same as the default */
1823 if ((want_set &&
1824 (sbi->s_mount_opt & m->mount_opt) != m->mount_opt) ||
1825 (!want_set && (sbi->s_mount_opt & m->mount_opt)))
1826 continue; /* select Opt_noFoo vs Opt_Foo */
1827 SEQ_OPTS_PRINT("%s", token2str(m->token));
1828 }
1829
1830 if (nodefs || !uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT4_DEF_RESUID)) ||
1831 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID)
1832 SEQ_OPTS_PRINT("resuid=%u",
1833 from_kuid_munged(&init_user_ns, sbi->s_resuid));
1834 if (nodefs || !gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT4_DEF_RESGID)) ||
1835 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID)
1836 SEQ_OPTS_PRINT("resgid=%u",
1837 from_kgid_munged(&init_user_ns, sbi->s_resgid));
1838 def_errors = nodefs ? -1 : le16_to_cpu(es->s_errors);
1839 if (test_opt(sb, ERRORS_RO) && def_errors != EXT4_ERRORS_RO)
1840 SEQ_OPTS_PUTS("errors=remount-ro");
1841 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
1842 SEQ_OPTS_PUTS("errors=continue");
1843 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
1844 SEQ_OPTS_PUTS("errors=panic");
1845 if (nodefs || sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ)
1846 SEQ_OPTS_PRINT("commit=%lu", sbi->s_commit_interval / HZ);
1847 if (nodefs || sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME)
1848 SEQ_OPTS_PRINT("min_batch_time=%u", sbi->s_min_batch_time);
1849 if (nodefs || sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME)
1850 SEQ_OPTS_PRINT("max_batch_time=%u", sbi->s_max_batch_time);
1851 if (sb->s_flags & MS_I_VERSION)
1852 SEQ_OPTS_PUTS("i_version");
1853 if (nodefs || sbi->s_stripe)
1854 SEQ_OPTS_PRINT("stripe=%lu", sbi->s_stripe);
1855 if (EXT4_MOUNT_DATA_FLAGS & (sbi->s_mount_opt ^ def_mount_opt)) {
1856 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
1857 SEQ_OPTS_PUTS("data=journal");
1858 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
1859 SEQ_OPTS_PUTS("data=ordered");
1860 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
1861 SEQ_OPTS_PUTS("data=writeback");
1862 }
1863 if (nodefs ||
1864 sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
1865 SEQ_OPTS_PRINT("inode_readahead_blks=%u",
1866 sbi->s_inode_readahead_blks);
1867
1868 if (nodefs || (test_opt(sb, INIT_INODE_TABLE) &&
1869 (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT)))
1870 SEQ_OPTS_PRINT("init_itable=%u", sbi->s_li_wait_mult);
1871 if (nodefs || sbi->s_max_dir_size_kb)
1872 SEQ_OPTS_PRINT("max_dir_size_kb=%u", sbi->s_max_dir_size_kb);
1873
1874 ext4_show_quota_options(seq, sb);
1875 return 0;
1876 }
1877
1878 static int ext4_show_options(struct seq_file *seq, struct dentry *root)
1879 {
1880 return _ext4_show_options(seq, root->d_sb, 0);
1881 }
1882
1883 static int options_seq_show(struct seq_file *seq, void *offset)
1884 {
1885 struct super_block *sb = seq->private;
1886 int rc;
1887
1888 seq_puts(seq, (sb->s_flags & MS_RDONLY) ? "ro" : "rw");
1889 rc = _ext4_show_options(seq, sb, 1);
1890 seq_puts(seq, "\n");
1891 return rc;
1892 }
1893
1894 static int options_open_fs(struct inode *inode, struct file *file)
1895 {
1896 return single_open(file, options_seq_show, PDE_DATA(inode));
1897 }
1898
1899 static const struct file_operations ext4_seq_options_fops = {
1900 .owner = THIS_MODULE,
1901 .open = options_open_fs,
1902 .read = seq_read,
1903 .llseek = seq_lseek,
1904 .release = single_release,
1905 };
1906
1907 static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
1908 int read_only)
1909 {
1910 struct ext4_sb_info *sbi = EXT4_SB(sb);
1911 int res = 0;
1912
1913 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
1914 ext4_msg(sb, KERN_ERR, "revision level too high, "
1915 "forcing read-only mode");
1916 res = MS_RDONLY;
1917 }
1918 if (read_only)
1919 goto done;
1920 if (!(sbi->s_mount_state & EXT4_VALID_FS))
1921 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
1922 "running e2fsck is recommended");
1923 else if (sbi->s_mount_state & EXT4_ERROR_FS)
1924 ext4_msg(sb, KERN_WARNING,
1925 "warning: mounting fs with errors, "
1926 "running e2fsck is recommended");
1927 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
1928 le16_to_cpu(es->s_mnt_count) >=
1929 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
1930 ext4_msg(sb, KERN_WARNING,
1931 "warning: maximal mount count reached, "
1932 "running e2fsck is recommended");
1933 else if (le32_to_cpu(es->s_checkinterval) &&
1934 (le32_to_cpu(es->s_lastcheck) +
1935 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1936 ext4_msg(sb, KERN_WARNING,
1937 "warning: checktime reached, "
1938 "running e2fsck is recommended");
1939 if (!sbi->s_journal)
1940 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
1941 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
1942 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
1943 le16_add_cpu(&es->s_mnt_count, 1);
1944 es->s_mtime = cpu_to_le32(get_seconds());
1945 ext4_update_dynamic_rev(sb);
1946 if (sbi->s_journal)
1947 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
1948
1949 ext4_commit_super(sb, 1);
1950 done:
1951 if (test_opt(sb, DEBUG))
1952 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
1953 "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
1954 sb->s_blocksize,
1955 sbi->s_groups_count,
1956 EXT4_BLOCKS_PER_GROUP(sb),
1957 EXT4_INODES_PER_GROUP(sb),
1958 sbi->s_mount_opt, sbi->s_mount_opt2);
1959
1960 cleancache_init_fs(sb);
1961 return res;
1962 }
1963
1964 int ext4_alloc_flex_bg_array(struct super_block *sb, ext4_group_t ngroup)
1965 {
1966 struct ext4_sb_info *sbi = EXT4_SB(sb);
1967 struct flex_groups *new_groups;
1968 int size;
1969
1970 if (!sbi->s_log_groups_per_flex)
1971 return 0;
1972
1973 size = ext4_flex_group(sbi, ngroup - 1) + 1;
1974 if (size <= sbi->s_flex_groups_allocated)
1975 return 0;
1976
1977 size = roundup_pow_of_two(size * sizeof(struct flex_groups));
1978 new_groups = ext4_kvzalloc(size, GFP_KERNEL);
1979 if (!new_groups) {
1980 ext4_msg(sb, KERN_ERR, "not enough memory for %d flex groups",
1981 size / (int) sizeof(struct flex_groups));
1982 return -ENOMEM;
1983 }
1984
1985 if (sbi->s_flex_groups) {
1986 memcpy(new_groups, sbi->s_flex_groups,
1987 (sbi->s_flex_groups_allocated *
1988 sizeof(struct flex_groups)));
1989 kvfree(sbi->s_flex_groups);
1990 }
1991 sbi->s_flex_groups = new_groups;
1992 sbi->s_flex_groups_allocated = size / sizeof(struct flex_groups);
1993 return 0;
1994 }
1995
1996 static int ext4_fill_flex_info(struct super_block *sb)
1997 {
1998 struct ext4_sb_info *sbi = EXT4_SB(sb);
1999 struct ext4_group_desc *gdp = NULL;
2000 ext4_group_t flex_group;
2001 int i, err;
2002
2003 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
2004 if (sbi->s_log_groups_per_flex < 1 || sbi->s_log_groups_per_flex > 31) {
2005 sbi->s_log_groups_per_flex = 0;
2006 return 1;
2007 }
2008
2009 err = ext4_alloc_flex_bg_array(sb, sbi->s_groups_count);
2010 if (err)
2011 goto failed;
2012
2013 for (i = 0; i < sbi->s_groups_count; i++) {
2014 gdp = ext4_get_group_desc(sb, i, NULL);
2015
2016 flex_group = ext4_flex_group(sbi, i);
2017 atomic_add(ext4_free_inodes_count(sb, gdp),
2018 &sbi->s_flex_groups[flex_group].free_inodes);
2019 atomic64_add(ext4_free_group_clusters(sb, gdp),
2020 &sbi->s_flex_groups[flex_group].free_clusters);
2021 atomic_add(ext4_used_dirs_count(sb, gdp),
2022 &sbi->s_flex_groups[flex_group].used_dirs);
2023 }
2024
2025 return 1;
2026 failed:
2027 return 0;
2028 }
2029
2030 static __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
2031 struct ext4_group_desc *gdp)
2032 {
2033 int offset;
2034 __u16 crc = 0;
2035 __le32 le_group = cpu_to_le32(block_group);
2036
2037 if (ext4_has_metadata_csum(sbi->s_sb)) {
2038 /* Use new metadata_csum algorithm */
2039 __le16 save_csum;
2040 __u32 csum32;
2041
2042 save_csum = gdp->bg_checksum;
2043 gdp->bg_checksum = 0;
2044 csum32 = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&le_group,
2045 sizeof(le_group));
2046 csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp,
2047 sbi->s_desc_size);
2048 gdp->bg_checksum = save_csum;
2049
2050 crc = csum32 & 0xFFFF;
2051 goto out;
2052 }
2053
2054 /* old crc16 code */
2055 if (!(sbi->s_es->s_feature_ro_compat &
2056 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)))
2057 return 0;
2058
2059 offset = offsetof(struct ext4_group_desc, bg_checksum);
2060
2061 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
2062 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
2063 crc = crc16(crc, (__u8 *)gdp, offset);
2064 offset += sizeof(gdp->bg_checksum); /* skip checksum */
2065 /* for checksum of struct ext4_group_desc do the rest...*/
2066 if ((sbi->s_es->s_feature_incompat &
2067 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) &&
2068 offset < le16_to_cpu(sbi->s_es->s_desc_size))
2069 crc = crc16(crc, (__u8 *)gdp + offset,
2070 le16_to_cpu(sbi->s_es->s_desc_size) -
2071 offset);
2072
2073 out:
2074 return cpu_to_le16(crc);
2075 }
2076
2077 int ext4_group_desc_csum_verify(struct super_block *sb, __u32 block_group,
2078 struct ext4_group_desc *gdp)
2079 {
2080 if (ext4_has_group_desc_csum(sb) &&
2081 (gdp->bg_checksum != ext4_group_desc_csum(EXT4_SB(sb),
2082 block_group, gdp)))
2083 return 0;
2084
2085 return 1;
2086 }
2087
2088 void ext4_group_desc_csum_set(struct super_block *sb, __u32 block_group,
2089 struct ext4_group_desc *gdp)
2090 {
2091 if (!ext4_has_group_desc_csum(sb))
2092 return;
2093 gdp->bg_checksum = ext4_group_desc_csum(EXT4_SB(sb), block_group, gdp);
2094 }
2095
2096 /* Called at mount-time, super-block is locked */
2097 static int ext4_check_descriptors(struct super_block *sb,
2098 ext4_group_t *first_not_zeroed)
2099 {
2100 struct ext4_sb_info *sbi = EXT4_SB(sb);
2101 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
2102 ext4_fsblk_t last_block;
2103 ext4_fsblk_t block_bitmap;
2104 ext4_fsblk_t inode_bitmap;
2105 ext4_fsblk_t inode_table;
2106 int flexbg_flag = 0;
2107 ext4_group_t i, grp = sbi->s_groups_count;
2108
2109 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
2110 flexbg_flag = 1;
2111
2112 ext4_debug("Checking group descriptors");
2113
2114 for (i = 0; i < sbi->s_groups_count; i++) {
2115 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
2116
2117 if (i == sbi->s_groups_count - 1 || flexbg_flag)
2118 last_block = ext4_blocks_count(sbi->s_es) - 1;
2119 else
2120 last_block = first_block +
2121 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
2122
2123 if ((grp == sbi->s_groups_count) &&
2124 !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2125 grp = i;
2126
2127 block_bitmap = ext4_block_bitmap(sb, gdp);
2128 if (block_bitmap < first_block || block_bitmap > last_block) {
2129 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2130 "Block bitmap for group %u not in group "
2131 "(block %llu)!", i, block_bitmap);
2132 return 0;
2133 }
2134 inode_bitmap = ext4_inode_bitmap(sb, gdp);
2135 if (inode_bitmap < first_block || inode_bitmap > last_block) {
2136 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2137 "Inode bitmap for group %u not in group "
2138 "(block %llu)!", i, inode_bitmap);
2139 return 0;
2140 }
2141 inode_table = ext4_inode_table(sb, gdp);
2142 if (inode_table < first_block ||
2143 inode_table + sbi->s_itb_per_group - 1 > last_block) {
2144 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2145 "Inode table for group %u not in group "
2146 "(block %llu)!", i, inode_table);
2147 return 0;
2148 }
2149 ext4_lock_group(sb, i);
2150 if (!ext4_group_desc_csum_verify(sb, i, gdp)) {
2151 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2152 "Checksum for group %u failed (%u!=%u)",
2153 i, le16_to_cpu(ext4_group_desc_csum(sbi, i,
2154 gdp)), le16_to_cpu(gdp->bg_checksum));
2155 if (!(sb->s_flags & MS_RDONLY)) {
2156 ext4_unlock_group(sb, i);
2157 return 0;
2158 }
2159 }
2160 ext4_unlock_group(sb, i);
2161 if (!flexbg_flag)
2162 first_block += EXT4_BLOCKS_PER_GROUP(sb);
2163 }
2164 if (NULL != first_not_zeroed)
2165 *first_not_zeroed = grp;
2166 return 1;
2167 }
2168
2169 /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
2170 * the superblock) which were deleted from all directories, but held open by
2171 * a process at the time of a crash. We walk the list and try to delete these
2172 * inodes at recovery time (only with a read-write filesystem).
2173 *
2174 * In order to keep the orphan inode chain consistent during traversal (in
2175 * case of crash during recovery), we link each inode into the superblock
2176 * orphan list_head and handle it the same way as an inode deletion during
2177 * normal operation (which journals the operations for us).
2178 *
2179 * We only do an iget() and an iput() on each inode, which is very safe if we
2180 * accidentally point at an in-use or already deleted inode. The worst that
2181 * can happen in this case is that we get a "bit already cleared" message from
2182 * ext4_free_inode(). The only reason we would point at a wrong inode is if
2183 * e2fsck was run on this filesystem, and it must have already done the orphan
2184 * inode cleanup for us, so we can safely abort without any further action.
2185 */
2186 static void ext4_orphan_cleanup(struct super_block *sb,
2187 struct ext4_super_block *es)
2188 {
2189 unsigned int s_flags = sb->s_flags;
2190 int nr_orphans = 0, nr_truncates = 0;
2191 #ifdef CONFIG_QUOTA
2192 int i;
2193 #endif
2194 if (!es->s_last_orphan) {
2195 jbd_debug(4, "no orphan inodes to clean up\n");
2196 return;
2197 }
2198
2199 if (bdev_read_only(sb->s_bdev)) {
2200 ext4_msg(sb, KERN_ERR, "write access "
2201 "unavailable, skipping orphan cleanup");
2202 return;
2203 }
2204
2205 /* Check if feature set would not allow a r/w mount */
2206 if (!ext4_feature_set_ok(sb, 0)) {
2207 ext4_msg(sb, KERN_INFO, "Skipping orphan cleanup due to "
2208 "unknown ROCOMPAT features");
2209 return;
2210 }
2211
2212 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
2213 /* don't clear list on RO mount w/ errors */
2214 if (es->s_last_orphan && !(s_flags & MS_RDONLY)) {
2215 ext4_msg(sb, KERN_INFO, "Errors on filesystem, "
2216 "clearing orphan list.\n");
2217 es->s_last_orphan = 0;
2218 }
2219 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2220 return;
2221 }
2222
2223 if (s_flags & MS_RDONLY) {
2224 ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
2225 sb->s_flags &= ~MS_RDONLY;
2226 }
2227 #ifdef CONFIG_QUOTA
2228 /* Needed for iput() to work correctly and not trash data */
2229 sb->s_flags |= MS_ACTIVE;
2230 /* Turn on quotas so that they are updated correctly */
2231 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
2232 if (EXT4_SB(sb)->s_qf_names[i]) {
2233 int ret = ext4_quota_on_mount(sb, i);
2234 if (ret < 0)
2235 ext4_msg(sb, KERN_ERR,
2236 "Cannot turn on journaled "
2237 "quota: error %d", ret);
2238 }
2239 }
2240 #endif
2241
2242 while (es->s_last_orphan) {
2243 struct inode *inode;
2244
2245 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
2246 if (IS_ERR(inode)) {
2247 es->s_last_orphan = 0;
2248 break;
2249 }
2250
2251 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
2252 dquot_initialize(inode);
2253 if (inode->i_nlink) {
2254 if (test_opt(sb, DEBUG))
2255 ext4_msg(sb, KERN_DEBUG,
2256 "%s: truncating inode %lu to %lld bytes",
2257 __func__, inode->i_ino, inode->i_size);
2258 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
2259 inode->i_ino, inode->i_size);
2260 mutex_lock(&inode->i_mutex);
2261 truncate_inode_pages(inode->i_mapping, inode->i_size);
2262 ext4_truncate(inode);
2263 mutex_unlock(&inode->i_mutex);
2264 nr_truncates++;
2265 } else {
2266 if (test_opt(sb, DEBUG))
2267 ext4_msg(sb, KERN_DEBUG,
2268 "%s: deleting unreferenced inode %lu",
2269 __func__, inode->i_ino);
2270 jbd_debug(2, "deleting unreferenced inode %lu\n",
2271 inode->i_ino);
2272 nr_orphans++;
2273 }
2274 iput(inode); /* The delete magic happens here! */
2275 }
2276
2277 #define PLURAL(x) (x), ((x) == 1) ? "" : "s"
2278
2279 if (nr_orphans)
2280 ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
2281 PLURAL(nr_orphans));
2282 if (nr_truncates)
2283 ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
2284 PLURAL(nr_truncates));
2285 #ifdef CONFIG_QUOTA
2286 /* Turn quotas off */
2287 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
2288 if (sb_dqopt(sb)->files[i])
2289 dquot_quota_off(sb, i);
2290 }
2291 #endif
2292 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
2293 }
2294
2295 /*
2296 * Maximal extent format file size.
2297 * Resulting logical blkno at s_maxbytes must fit in our on-disk
2298 * extent format containers, within a sector_t, and within i_blocks
2299 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
2300 * so that won't be a limiting factor.
2301 *
2302 * However there is other limiting factor. We do store extents in the form
2303 * of starting block and length, hence the resulting length of the extent
2304 * covering maximum file size must fit into on-disk format containers as
2305 * well. Given that length is always by 1 unit bigger than max unit (because
2306 * we count 0 as well) we have to lower the s_maxbytes by one fs block.
2307 *
2308 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
2309 */
2310 static loff_t ext4_max_size(int blkbits, int has_huge_files)
2311 {
2312 loff_t res;
2313 loff_t upper_limit = MAX_LFS_FILESIZE;
2314
2315 /* small i_blocks in vfs inode? */
2316 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
2317 /*
2318 * CONFIG_LBDAF is not enabled implies the inode
2319 * i_block represent total blocks in 512 bytes
2320 * 32 == size of vfs inode i_blocks * 8
2321 */
2322 upper_limit = (1LL << 32) - 1;
2323
2324 /* total blocks in file system block size */
2325 upper_limit >>= (blkbits - 9);
2326 upper_limit <<= blkbits;
2327 }
2328
2329 /*
2330 * 32-bit extent-start container, ee_block. We lower the maxbytes
2331 * by one fs block, so ee_len can cover the extent of maximum file
2332 * size
2333 */
2334 res = (1LL << 32) - 1;
2335 res <<= blkbits;
2336
2337 /* Sanity check against vm- & vfs- imposed limits */
2338 if (res > upper_limit)
2339 res = upper_limit;
2340
2341 return res;
2342 }
2343
2344 /*
2345 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
2346 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2347 * We need to be 1 filesystem block less than the 2^48 sector limit.
2348 */
2349 static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
2350 {
2351 loff_t res = EXT4_NDIR_BLOCKS;
2352 int meta_blocks;
2353 loff_t upper_limit;
2354 /* This is calculated to be the largest file size for a dense, block
2355 * mapped file such that the file's total number of 512-byte sectors,
2356 * including data and all indirect blocks, does not exceed (2^48 - 1).
2357 *
2358 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2359 * number of 512-byte sectors of the file.
2360 */
2361
2362 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
2363 /*
2364 * !has_huge_files or CONFIG_LBDAF not enabled implies that
2365 * the inode i_block field represents total file blocks in
2366 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
2367 */
2368 upper_limit = (1LL << 32) - 1;
2369
2370 /* total blocks in file system block size */
2371 upper_limit >>= (bits - 9);
2372
2373 } else {
2374 /*
2375 * We use 48 bit ext4_inode i_blocks
2376 * With EXT4_HUGE_FILE_FL set the i_blocks
2377 * represent total number of blocks in
2378 * file system block size
2379 */
2380 upper_limit = (1LL << 48) - 1;
2381
2382 }
2383
2384 /* indirect blocks */
2385 meta_blocks = 1;
2386 /* double indirect blocks */
2387 meta_blocks += 1 + (1LL << (bits-2));
2388 /* tripple indirect blocks */
2389 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
2390
2391 upper_limit -= meta_blocks;
2392 upper_limit <<= bits;
2393
2394 res += 1LL << (bits-2);
2395 res += 1LL << (2*(bits-2));
2396 res += 1LL << (3*(bits-2));
2397 res <<= bits;
2398 if (res > upper_limit)
2399 res = upper_limit;
2400
2401 if (res > MAX_LFS_FILESIZE)
2402 res = MAX_LFS_FILESIZE;
2403
2404 return res;
2405 }
2406
2407 static ext4_fsblk_t descriptor_loc(struct super_block *sb,
2408 ext4_fsblk_t logical_sb_block, int nr)
2409 {
2410 struct ext4_sb_info *sbi = EXT4_SB(sb);
2411 ext4_group_t bg, first_meta_bg;
2412 int has_super = 0;
2413
2414 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
2415
2416 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
2417 nr < first_meta_bg)
2418 return logical_sb_block + nr + 1;
2419 bg = sbi->s_desc_per_block * nr;
2420 if (ext4_bg_has_super(sb, bg))
2421 has_super = 1;
2422
2423 /*
2424 * If we have a meta_bg fs with 1k blocks, group 0's GDT is at
2425 * block 2, not 1. If s_first_data_block == 0 (bigalloc is enabled
2426 * on modern mke2fs or blksize > 1k on older mke2fs) then we must
2427 * compensate.
2428 */
2429 if (sb->s_blocksize == 1024 && nr == 0 &&
2430 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block) == 0)
2431 has_super++;
2432
2433 return (has_super + ext4_group_first_block_no(sb, bg));
2434 }
2435
2436 /**
2437 * ext4_get_stripe_size: Get the stripe size.
2438 * @sbi: In memory super block info
2439 *
2440 * If we have specified it via mount option, then
2441 * use the mount option value. If the value specified at mount time is
2442 * greater than the blocks per group use the super block value.
2443 * If the super block value is greater than blocks per group return 0.
2444 * Allocator needs it be less than blocks per group.
2445 *
2446 */
2447 static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
2448 {
2449 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
2450 unsigned long stripe_width =
2451 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
2452 int ret;
2453
2454 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
2455 ret = sbi->s_stripe;
2456 else if (stripe_width <= sbi->s_blocks_per_group)
2457 ret = stripe_width;
2458 else if (stride <= sbi->s_blocks_per_group)
2459 ret = stride;
2460 else
2461 ret = 0;
2462
2463 /*
2464 * If the stripe width is 1, this makes no sense and
2465 * we set it to 0 to turn off stripe handling code.
2466 */
2467 if (ret <= 1)
2468 ret = 0;
2469
2470 return ret;
2471 }
2472
2473 /* sysfs supprt */
2474
2475 struct ext4_attr {
2476 struct attribute attr;
2477 ssize_t (*show)(struct ext4_attr *, struct ext4_sb_info *, char *);
2478 ssize_t (*store)(struct ext4_attr *, struct ext4_sb_info *,
2479 const char *, size_t);
2480 union {
2481 int offset;
2482 int deprecated_val;
2483 } u;
2484 };
2485
2486 static int parse_strtoull(const char *buf,
2487 unsigned long long max, unsigned long long *value)
2488 {
2489 int ret;
2490
2491 ret = kstrtoull(skip_spaces(buf), 0, value);
2492 if (!ret && *value > max)
2493 ret = -EINVAL;
2494 return ret;
2495 }
2496
2497 static ssize_t delayed_allocation_blocks_show(struct ext4_attr *a,
2498 struct ext4_sb_info *sbi,
2499 char *buf)
2500 {
2501 return snprintf(buf, PAGE_SIZE, "%llu\n",
2502 (s64) EXT4_C2B(sbi,
2503 percpu_counter_sum(&sbi->s_dirtyclusters_counter)));
2504 }
2505
2506 static ssize_t session_write_kbytes_show(struct ext4_attr *a,
2507 struct ext4_sb_info *sbi, char *buf)
2508 {
2509 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2510
2511 if (!sb->s_bdev->bd_part)
2512 return snprintf(buf, PAGE_SIZE, "0\n");
2513 return snprintf(buf, PAGE_SIZE, "%lu\n",
2514 (part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
2515 sbi->s_sectors_written_start) >> 1);
2516 }
2517
2518 static ssize_t lifetime_write_kbytes_show(struct ext4_attr *a,
2519 struct ext4_sb_info *sbi, char *buf)
2520 {
2521 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2522
2523 if (!sb->s_bdev->bd_part)
2524 return snprintf(buf, PAGE_SIZE, "0\n");
2525 return snprintf(buf, PAGE_SIZE, "%llu\n",
2526 (unsigned long long)(sbi->s_kbytes_written +
2527 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
2528 EXT4_SB(sb)->s_sectors_written_start) >> 1)));
2529 }
2530
2531 static ssize_t inode_readahead_blks_store(struct ext4_attr *a,
2532 struct ext4_sb_info *sbi,
2533 const char *buf, size_t count)
2534 {
2535 unsigned long t;
2536 int ret;
2537
2538 ret = kstrtoul(skip_spaces(buf), 0, &t);
2539 if (ret)
2540 return ret;
2541
2542 if (t && (!is_power_of_2(t) || t > 0x40000000))
2543 return -EINVAL;
2544
2545 sbi->s_inode_readahead_blks = t;
2546 return count;
2547 }
2548
2549 static ssize_t sbi_ui_show(struct ext4_attr *a,
2550 struct ext4_sb_info *sbi, char *buf)
2551 {
2552 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->u.offset);
2553
2554 return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
2555 }
2556
2557 static ssize_t sbi_ui_store(struct ext4_attr *a,
2558 struct ext4_sb_info *sbi,
2559 const char *buf, size_t count)
2560 {
2561 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->u.offset);
2562 unsigned long t;
2563 int ret;
2564
2565 ret = kstrtoul(skip_spaces(buf), 0, &t);
2566 if (ret)
2567 return ret;
2568 *ui = t;
2569 return count;
2570 }
2571
2572 static ssize_t es_ui_show(struct ext4_attr *a,
2573 struct ext4_sb_info *sbi, char *buf)
2574 {
2575
2576 unsigned int *ui = (unsigned int *) (((char *) sbi->s_es) +
2577 a->u.offset);
2578
2579 return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
2580 }
2581
2582 static ssize_t reserved_clusters_show(struct ext4_attr *a,
2583 struct ext4_sb_info *sbi, char *buf)
2584 {
2585 return snprintf(buf, PAGE_SIZE, "%llu\n",
2586 (unsigned long long) atomic64_read(&sbi->s_resv_clusters));
2587 }
2588
2589 static ssize_t reserved_clusters_store(struct ext4_attr *a,
2590 struct ext4_sb_info *sbi,
2591 const char *buf, size_t count)
2592 {
2593 unsigned long long val;
2594 int ret;
2595
2596 if (parse_strtoull(buf, -1ULL, &val))
2597 return -EINVAL;
2598 ret = ext4_reserve_clusters(sbi, val);
2599
2600 return ret ? ret : count;
2601 }
2602
2603 static ssize_t trigger_test_error(struct ext4_attr *a,
2604 struct ext4_sb_info *sbi,
2605 const char *buf, size_t count)
2606 {
2607 int len = count;
2608
2609 if (!capable(CAP_SYS_ADMIN))
2610 return -EPERM;
2611
2612 if (len && buf[len-1] == '\n')
2613 len--;
2614
2615 if (len)
2616 ext4_error(sbi->s_sb, "%.*s", len, buf);
2617 return count;
2618 }
2619
2620 static ssize_t sbi_deprecated_show(struct ext4_attr *a,
2621 struct ext4_sb_info *sbi, char *buf)
2622 {
2623 return snprintf(buf, PAGE_SIZE, "%d\n", a->u.deprecated_val);
2624 }
2625
2626 #define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \
2627 static struct ext4_attr ext4_attr_##_name = { \
2628 .attr = {.name = __stringify(_name), .mode = _mode }, \
2629 .show = _show, \
2630 .store = _store, \
2631 .u = { \
2632 .offset = offsetof(struct ext4_sb_info, _elname),\
2633 }, \
2634 }
2635
2636 #define EXT4_ATTR_OFFSET_ES(_name,_mode,_show,_store,_elname) \
2637 static struct ext4_attr ext4_attr_##_name = { \
2638 .attr = {.name = __stringify(_name), .mode = _mode }, \
2639 .show = _show, \
2640 .store = _store, \
2641 .u = { \
2642 .offset = offsetof(struct ext4_super_block, _elname), \
2643 }, \
2644 }
2645
2646 #define EXT4_ATTR(name, mode, show, store) \
2647 static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store)
2648
2649 #define EXT4_INFO_ATTR(name) EXT4_ATTR(name, 0444, NULL, NULL)
2650 #define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL)
2651 #define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store)
2652
2653 #define EXT4_RO_ATTR_ES_UI(name, elname) \
2654 EXT4_ATTR_OFFSET_ES(name, 0444, es_ui_show, NULL, elname)
2655 #define EXT4_RW_ATTR_SBI_UI(name, elname) \
2656 EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname)
2657
2658 #define ATTR_LIST(name) &ext4_attr_##name.attr
2659 #define EXT4_DEPRECATED_ATTR(_name, _val) \
2660 static struct ext4_attr ext4_attr_##_name = { \
2661 .attr = {.name = __stringify(_name), .mode = 0444 }, \
2662 .show = sbi_deprecated_show, \
2663 .u = { \
2664 .deprecated_val = _val, \
2665 }, \
2666 }
2667
2668 EXT4_RO_ATTR(delayed_allocation_blocks);
2669 EXT4_RO_ATTR(session_write_kbytes);
2670 EXT4_RO_ATTR(lifetime_write_kbytes);
2671 EXT4_RW_ATTR(reserved_clusters);
2672 EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, sbi_ui_show,
2673 inode_readahead_blks_store, s_inode_readahead_blks);
2674 EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal);
2675 EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats);
2676 EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan);
2677 EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan);
2678 EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs);
2679 EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request);
2680 EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc);
2681 EXT4_DEPRECATED_ATTR(max_writeback_mb_bump, 128);
2682 EXT4_RW_ATTR_SBI_UI(extent_max_zeroout_kb, s_extent_max_zeroout_kb);
2683 EXT4_ATTR(trigger_fs_error, 0200, NULL, trigger_test_error);
2684 EXT4_RW_ATTR_SBI_UI(err_ratelimit_interval_ms, s_err_ratelimit_state.interval);
2685 EXT4_RW_ATTR_SBI_UI(err_ratelimit_burst, s_err_ratelimit_state.burst);
2686 EXT4_RW_ATTR_SBI_UI(warning_ratelimit_interval_ms, s_warning_ratelimit_state.interval);
2687 EXT4_RW_ATTR_SBI_UI(warning_ratelimit_burst, s_warning_ratelimit_state.burst);
2688 EXT4_RW_ATTR_SBI_UI(msg_ratelimit_interval_ms, s_msg_ratelimit_state.interval);
2689 EXT4_RW_ATTR_SBI_UI(msg_ratelimit_burst, s_msg_ratelimit_state.burst);
2690 EXT4_RO_ATTR_ES_UI(errors_count, s_error_count);
2691 EXT4_RO_ATTR_ES_UI(first_error_time, s_first_error_time);
2692 EXT4_RO_ATTR_ES_UI(last_error_time, s_last_error_time);
2693
2694 static struct attribute *ext4_attrs[] = {
2695 ATTR_LIST(delayed_allocation_blocks),
2696 ATTR_LIST(session_write_kbytes),
2697 ATTR_LIST(lifetime_write_kbytes),
2698 ATTR_LIST(reserved_clusters),
2699 ATTR_LIST(inode_readahead_blks),
2700 ATTR_LIST(inode_goal),
2701 ATTR_LIST(mb_stats),
2702 ATTR_LIST(mb_max_to_scan),
2703 ATTR_LIST(mb_min_to_scan),
2704 ATTR_LIST(mb_order2_req),
2705 ATTR_LIST(mb_stream_req),
2706 ATTR_LIST(mb_group_prealloc),
2707 ATTR_LIST(max_writeback_mb_bump),
2708 ATTR_LIST(extent_max_zeroout_kb),
2709 ATTR_LIST(trigger_fs_error),
2710 ATTR_LIST(err_ratelimit_interval_ms),
2711 ATTR_LIST(err_ratelimit_burst),
2712 ATTR_LIST(warning_ratelimit_interval_ms),
2713 ATTR_LIST(warning_ratelimit_burst),
2714 ATTR_LIST(msg_ratelimit_interval_ms),
2715 ATTR_LIST(msg_ratelimit_burst),
2716 ATTR_LIST(errors_count),
2717 ATTR_LIST(first_error_time),
2718 ATTR_LIST(last_error_time),
2719 NULL,
2720 };
2721
2722 /* Features this copy of ext4 supports */
2723 EXT4_INFO_ATTR(lazy_itable_init);
2724 EXT4_INFO_ATTR(batched_discard);
2725 EXT4_INFO_ATTR(meta_bg_resize);
2726 EXT4_INFO_ATTR(encryption);
2727
2728 static struct attribute *ext4_feat_attrs[] = {
2729 ATTR_LIST(lazy_itable_init),
2730 ATTR_LIST(batched_discard),
2731 ATTR_LIST(meta_bg_resize),
2732 ATTR_LIST(encryption),
2733 NULL,
2734 };
2735
2736 static ssize_t ext4_attr_show(struct kobject *kobj,
2737 struct attribute *attr, char *buf)
2738 {
2739 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2740 s_kobj);
2741 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2742
2743 return a->show ? a->show(a, sbi, buf) : 0;
2744 }
2745
2746 static ssize_t ext4_attr_store(struct kobject *kobj,
2747 struct attribute *attr,
2748 const char *buf, size_t len)
2749 {
2750 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2751 s_kobj);
2752 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2753
2754 return a->store ? a->store(a, sbi, buf, len) : 0;
2755 }
2756
2757 static void ext4_sb_release(struct kobject *kobj)
2758 {
2759 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2760 s_kobj);
2761 complete(&sbi->s_kobj_unregister);
2762 }
2763
2764 static const struct sysfs_ops ext4_attr_ops = {
2765 .show = ext4_attr_show,
2766 .store = ext4_attr_store,
2767 };
2768
2769 static struct kobj_type ext4_ktype = {
2770 .default_attrs = ext4_attrs,
2771 .sysfs_ops = &ext4_attr_ops,
2772 .release = ext4_sb_release,
2773 };
2774
2775 static void ext4_feat_release(struct kobject *kobj)
2776 {
2777 complete(&ext4_feat->f_kobj_unregister);
2778 }
2779
2780 static ssize_t ext4_feat_show(struct kobject *kobj,
2781 struct attribute *attr, char *buf)
2782 {
2783 return snprintf(buf, PAGE_SIZE, "supported\n");
2784 }
2785
2786 /*
2787 * We can not use ext4_attr_show/store because it relies on the kobject
2788 * being embedded in the ext4_sb_info structure which is definitely not
2789 * true in this case.
2790 */
2791 static const struct sysfs_ops ext4_feat_ops = {
2792 .show = ext4_feat_show,
2793 .store = NULL,
2794 };
2795
2796 static struct kobj_type ext4_feat_ktype = {
2797 .default_attrs = ext4_feat_attrs,
2798 .sysfs_ops = &ext4_feat_ops,
2799 .release = ext4_feat_release,
2800 };
2801
2802 /*
2803 * Check whether this filesystem can be mounted based on
2804 * the features present and the RDONLY/RDWR mount requested.
2805 * Returns 1 if this filesystem can be mounted as requested,
2806 * 0 if it cannot be.
2807 */
2808 static int ext4_feature_set_ok(struct super_block *sb, int readonly)
2809 {
2810 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP)) {
2811 ext4_msg(sb, KERN_ERR,
2812 "Couldn't mount because of "
2813 "unsupported optional features (%x)",
2814 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
2815 ~EXT4_FEATURE_INCOMPAT_SUPP));
2816 return 0;
2817 }
2818
2819 if (readonly)
2820 return 1;
2821
2822 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_READONLY)) {
2823 ext4_msg(sb, KERN_INFO, "filesystem is read-only");
2824 sb->s_flags |= MS_RDONLY;
2825 return 1;
2826 }
2827
2828 /* Check that feature set is OK for a read-write mount */
2829 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP)) {
2830 ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of "
2831 "unsupported optional features (%x)",
2832 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
2833 ~EXT4_FEATURE_RO_COMPAT_SUPP));
2834 return 0;
2835 }
2836 /*
2837 * Large file size enabled file system can only be mounted
2838 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
2839 */
2840 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) {
2841 if (sizeof(blkcnt_t) < sizeof(u64)) {
2842 ext4_msg(sb, KERN_ERR, "Filesystem with huge files "
2843 "cannot be mounted RDWR without "
2844 "CONFIG_LBDAF");
2845 return 0;
2846 }
2847 }
2848 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_BIGALLOC) &&
2849 !EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS)) {
2850 ext4_msg(sb, KERN_ERR,
2851 "Can't support bigalloc feature without "
2852 "extents feature\n");
2853 return 0;
2854 }
2855
2856 #ifndef CONFIG_QUOTA
2857 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) &&
2858 !readonly) {
2859 ext4_msg(sb, KERN_ERR,
2860 "Filesystem with quota feature cannot be mounted RDWR "
2861 "without CONFIG_QUOTA");
2862 return 0;
2863 }
2864 #endif /* CONFIG_QUOTA */
2865 return 1;
2866 }
2867
2868 /*
2869 * This function is called once a day if we have errors logged
2870 * on the file system
2871 */
2872 static void print_daily_error_info(unsigned long arg)
2873 {
2874 struct super_block *sb = (struct super_block *) arg;
2875 struct ext4_sb_info *sbi;
2876 struct ext4_super_block *es;
2877
2878 sbi = EXT4_SB(sb);
2879 es = sbi->s_es;
2880
2881 if (es->s_error_count)
2882 /* fsck newer than v1.41.13 is needed to clean this condition. */
2883 ext4_msg(sb, KERN_NOTICE, "error count since last fsck: %u",
2884 le32_to_cpu(es->s_error_count));
2885 if (es->s_first_error_time) {
2886 printk(KERN_NOTICE "EXT4-fs (%s): initial error at time %u: %.*s:%d",
2887 sb->s_id, le32_to_cpu(es->s_first_error_time),
2888 (int) sizeof(es->s_first_error_func),
2889 es->s_first_error_func,
2890 le32_to_cpu(es->s_first_error_line));
2891 if (es->s_first_error_ino)
2892 printk(": inode %u",
2893 le32_to_cpu(es->s_first_error_ino));
2894 if (es->s_first_error_block)
2895 printk(": block %llu", (unsigned long long)
2896 le64_to_cpu(es->s_first_error_block));
2897 printk("\n");
2898 }
2899 if (es->s_last_error_time) {
2900 printk(KERN_NOTICE "EXT4-fs (%s): last error at time %u: %.*s:%d",
2901 sb->s_id, le32_to_cpu(es->s_last_error_time),
2902 (int) sizeof(es->s_last_error_func),
2903 es->s_last_error_func,
2904 le32_to_cpu(es->s_last_error_line));
2905 if (es->s_last_error_ino)
2906 printk(": inode %u",
2907 le32_to_cpu(es->s_last_error_ino));
2908 if (es->s_last_error_block)
2909 printk(": block %llu", (unsigned long long)
2910 le64_to_cpu(es->s_last_error_block));
2911 printk("\n");
2912 }
2913 mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ); /* Once a day */
2914 }
2915
2916 /* Find next suitable group and run ext4_init_inode_table */
2917 static int ext4_run_li_request(struct ext4_li_request *elr)
2918 {
2919 struct ext4_group_desc *gdp = NULL;
2920 ext4_group_t group, ngroups;
2921 struct super_block *sb;
2922 unsigned long timeout = 0;
2923 int ret = 0;
2924
2925 sb = elr->lr_super;
2926 ngroups = EXT4_SB(sb)->s_groups_count;
2927
2928 sb_start_write(sb);
2929 for (group = elr->lr_next_group; group < ngroups; group++) {
2930 gdp = ext4_get_group_desc(sb, group, NULL);
2931 if (!gdp) {
2932 ret = 1;
2933 break;
2934 }
2935
2936 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2937 break;
2938 }
2939
2940 if (group >= ngroups)
2941 ret = 1;
2942
2943 if (!ret) {
2944 timeout = jiffies;
2945 ret = ext4_init_inode_table(sb, group,
2946 elr->lr_timeout ? 0 : 1);
2947 if (elr->lr_timeout == 0) {
2948 timeout = (jiffies - timeout) *
2949 elr->lr_sbi->s_li_wait_mult;
2950 elr->lr_timeout = timeout;
2951 }
2952 elr->lr_next_sched = jiffies + elr->lr_timeout;
2953 elr->lr_next_group = group + 1;
2954 }
2955 sb_end_write(sb);
2956
2957 return ret;
2958 }
2959
2960 /*
2961 * Remove lr_request from the list_request and free the
2962 * request structure. Should be called with li_list_mtx held
2963 */
2964 static void ext4_remove_li_request(struct ext4_li_request *elr)
2965 {
2966 struct ext4_sb_info *sbi;
2967
2968 if (!elr)
2969 return;
2970
2971 sbi = elr->lr_sbi;
2972
2973 list_del(&elr->lr_request);
2974 sbi->s_li_request = NULL;
2975 kfree(elr);
2976 }
2977
2978 static void ext4_unregister_li_request(struct super_block *sb)
2979 {
2980 mutex_lock(&ext4_li_mtx);
2981 if (!ext4_li_info) {
2982 mutex_unlock(&ext4_li_mtx);
2983 return;
2984 }
2985
2986 mutex_lock(&ext4_li_info->li_list_mtx);
2987 ext4_remove_li_request(EXT4_SB(sb)->s_li_request);
2988 mutex_unlock(&ext4_li_info->li_list_mtx);
2989 mutex_unlock(&ext4_li_mtx);
2990 }
2991
2992 static struct task_struct *ext4_lazyinit_task;
2993
2994 /*
2995 * This is the function where ext4lazyinit thread lives. It walks
2996 * through the request list searching for next scheduled filesystem.
2997 * When such a fs is found, run the lazy initialization request
2998 * (ext4_rn_li_request) and keep track of the time spend in this
2999 * function. Based on that time we compute next schedule time of
3000 * the request. When walking through the list is complete, compute
3001 * next waking time and put itself into sleep.
3002 */
3003 static int ext4_lazyinit_thread(void *arg)
3004 {
3005 struct ext4_lazy_init *eli = (struct ext4_lazy_init *)arg;
3006 struct list_head *pos, *n;
3007 struct ext4_li_request *elr;
3008 unsigned long next_wakeup, cur;
3009
3010 BUG_ON(NULL == eli);
3011
3012 cont_thread:
3013 while (true) {
3014 next_wakeup = MAX_JIFFY_OFFSET;
3015
3016 mutex_lock(&eli->li_list_mtx);
3017 if (list_empty(&eli->li_request_list)) {
3018 mutex_unlock(&eli->li_list_mtx);
3019 goto exit_thread;
3020 }
3021
3022 list_for_each_safe(pos, n, &eli->li_request_list) {
3023 elr = list_entry(pos, struct ext4_li_request,
3024 lr_request);
3025
3026 if (time_after_eq(jiffies, elr->lr_next_sched)) {
3027 if (ext4_run_li_request(elr) != 0) {
3028 /* error, remove the lazy_init job */
3029 ext4_remove_li_request(elr);
3030 continue;
3031 }
3032 }
3033
3034 if (time_before(elr->lr_next_sched, next_wakeup))
3035 next_wakeup = elr->lr_next_sched;
3036 }
3037 mutex_unlock(&eli->li_list_mtx);
3038
3039 try_to_freeze();
3040
3041 cur = jiffies;
3042 if ((time_after_eq(cur, next_wakeup)) ||
3043 (MAX_JIFFY_OFFSET == next_wakeup)) {
3044 cond_resched();
3045 continue;
3046 }
3047
3048 schedule_timeout_interruptible(next_wakeup - cur);
3049
3050 if (kthread_should_stop()) {
3051 ext4_clear_request_list();
3052 goto exit_thread;
3053 }
3054 }
3055
3056 exit_thread:
3057 /*
3058 * It looks like the request list is empty, but we need
3059 * to check it under the li_list_mtx lock, to prevent any
3060 * additions into it, and of course we should lock ext4_li_mtx
3061 * to atomically free the list and ext4_li_info, because at
3062 * this point another ext4 filesystem could be registering
3063 * new one.
3064 */
3065 mutex_lock(&ext4_li_mtx);
3066 mutex_lock(&eli->li_list_mtx);
3067 if (!list_empty(&eli->li_request_list)) {
3068 mutex_unlock(&eli->li_list_mtx);
3069 mutex_unlock(&ext4_li_mtx);
3070 goto cont_thread;
3071 }
3072 mutex_unlock(&eli->li_list_mtx);
3073 kfree(ext4_li_info);
3074 ext4_li_info = NULL;
3075 mutex_unlock(&ext4_li_mtx);
3076
3077 return 0;
3078 }
3079
3080 static void ext4_clear_request_list(void)
3081 {
3082 struct list_head *pos, *n;
3083 struct ext4_li_request *elr;
3084
3085 mutex_lock(&ext4_li_info->li_list_mtx);
3086 list_for_each_safe(pos, n, &ext4_li_info->li_request_list) {
3087 elr = list_entry(pos, struct ext4_li_request,
3088 lr_request);
3089 ext4_remove_li_request(elr);
3090 }
3091 mutex_unlock(&ext4_li_info->li_list_mtx);
3092 }
3093
3094 static int ext4_run_lazyinit_thread(void)
3095 {
3096 ext4_lazyinit_task = kthread_run(ext4_lazyinit_thread,
3097 ext4_li_info, "ext4lazyinit");
3098 if (IS_ERR(ext4_lazyinit_task)) {
3099 int err = PTR_ERR(ext4_lazyinit_task);
3100 ext4_clear_request_list();
3101 kfree(ext4_li_info);
3102 ext4_li_info = NULL;
3103 printk(KERN_CRIT "EXT4-fs: error %d creating inode table "
3104 "initialization thread\n",
3105 err);
3106 return err;
3107 }
3108 ext4_li_info->li_state |= EXT4_LAZYINIT_RUNNING;
3109 return 0;
3110 }
3111
3112 /*
3113 * Check whether it make sense to run itable init. thread or not.
3114 * If there is at least one uninitialized inode table, return
3115 * corresponding group number, else the loop goes through all
3116 * groups and return total number of groups.
3117 */
3118 static ext4_group_t ext4_has_uninit_itable(struct super_block *sb)
3119 {
3120 ext4_group_t group, ngroups = EXT4_SB(sb)->s_groups_count;
3121 struct ext4_group_desc *gdp = NULL;
3122
3123 for (group = 0; group < ngroups; group++) {
3124 gdp = ext4_get_group_desc(sb, group, NULL);
3125 if (!gdp)
3126 continue;
3127
3128 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
3129 break;
3130 }
3131
3132 return group;
3133 }
3134
3135 static int ext4_li_info_new(void)
3136 {
3137 struct ext4_lazy_init *eli = NULL;
3138
3139 eli = kzalloc(sizeof(*eli), GFP_KERNEL);
3140 if (!eli)
3141 return -ENOMEM;
3142
3143 INIT_LIST_HEAD(&eli->li_request_list);
3144 mutex_init(&eli->li_list_mtx);
3145
3146 eli->li_state |= EXT4_LAZYINIT_QUIT;
3147
3148 ext4_li_info = eli;
3149
3150 return 0;
3151 }
3152
3153 static struct ext4_li_request *ext4_li_request_new(struct super_block *sb,
3154 ext4_group_t start)
3155 {
3156 struct ext4_sb_info *sbi = EXT4_SB(sb);
3157 struct ext4_li_request *elr;
3158
3159 elr = kzalloc(sizeof(*elr), GFP_KERNEL);
3160 if (!elr)
3161 return NULL;
3162
3163 elr->lr_super = sb;
3164 elr->lr_sbi = sbi;
3165 elr->lr_next_group = start;
3166
3167 /*
3168 * Randomize first schedule time of the request to
3169 * spread the inode table initialization requests
3170 * better.
3171 */
3172 elr->lr_next_sched = jiffies + (prandom_u32() %
3173 (EXT4_DEF_LI_MAX_START_DELAY * HZ));
3174 return elr;
3175 }
3176
3177 int ext4_register_li_request(struct super_block *sb,
3178 ext4_group_t first_not_zeroed)
3179 {
3180 struct ext4_sb_info *sbi = EXT4_SB(sb);
3181 struct ext4_li_request *elr = NULL;
3182 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
3183 int ret = 0;
3184
3185 mutex_lock(&ext4_li_mtx);
3186 if (sbi->s_li_request != NULL) {
3187 /*
3188 * Reset timeout so it can be computed again, because
3189 * s_li_wait_mult might have changed.
3190 */
3191 sbi->s_li_request->lr_timeout = 0;
3192 goto out;
3193 }
3194
3195 if (first_not_zeroed == ngroups ||
3196 (sb->s_flags & MS_RDONLY) ||
3197 !test_opt(sb, INIT_INODE_TABLE))
3198 goto out;
3199
3200 elr = ext4_li_request_new(sb, first_not_zeroed);
3201 if (!elr) {
3202 ret = -ENOMEM;
3203 goto out;
3204 }
3205
3206 if (NULL == ext4_li_info) {
3207 ret = ext4_li_info_new();
3208 if (ret)
3209 goto out;
3210 }
3211
3212 mutex_lock(&ext4_li_info->li_list_mtx);
3213 list_add(&elr->lr_request, &ext4_li_info->li_request_list);
3214 mutex_unlock(&ext4_li_info->li_list_mtx);
3215
3216 sbi->s_li_request = elr;
3217 /*
3218 * set elr to NULL here since it has been inserted to
3219 * the request_list and the removal and free of it is
3220 * handled by ext4_clear_request_list from now on.
3221 */
3222 elr = NULL;
3223
3224 if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) {
3225 ret = ext4_run_lazyinit_thread();
3226 if (ret)
3227 goto out;
3228 }
3229 out:
3230 mutex_unlock(&ext4_li_mtx);
3231 if (ret)
3232 kfree(elr);
3233 return ret;
3234 }
3235
3236 /*
3237 * We do not need to lock anything since this is called on
3238 * module unload.
3239 */
3240 static void ext4_destroy_lazyinit_thread(void)
3241 {
3242 /*
3243 * If thread exited earlier
3244 * there's nothing to be done.
3245 */
3246 if (!ext4_li_info || !ext4_lazyinit_task)
3247 return;
3248
3249 kthread_stop(ext4_lazyinit_task);
3250 }
3251
3252 static int set_journal_csum_feature_set(struct super_block *sb)
3253 {
3254 int ret = 1;
3255 int compat, incompat;
3256 struct ext4_sb_info *sbi = EXT4_SB(sb);
3257
3258 if (ext4_has_metadata_csum(sb)) {
3259 /* journal checksum v3 */
3260 compat = 0;
3261 incompat = JBD2_FEATURE_INCOMPAT_CSUM_V3;
3262 } else {
3263 /* journal checksum v1 */
3264 compat = JBD2_FEATURE_COMPAT_CHECKSUM;
3265 incompat = 0;
3266 }
3267
3268 jbd2_journal_clear_features(sbi->s_journal,
3269 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
3270 JBD2_FEATURE_INCOMPAT_CSUM_V3 |
3271 JBD2_FEATURE_INCOMPAT_CSUM_V2);
3272 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
3273 ret = jbd2_journal_set_features(sbi->s_journal,
3274 compat, 0,
3275 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT |
3276 incompat);
3277 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
3278 ret = jbd2_journal_set_features(sbi->s_journal,
3279 compat, 0,
3280 incompat);
3281 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
3282 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
3283 } else {
3284 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
3285 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
3286 }
3287
3288 return ret;
3289 }
3290
3291 /*
3292 * Note: calculating the overhead so we can be compatible with
3293 * historical BSD practice is quite difficult in the face of
3294 * clusters/bigalloc. This is because multiple metadata blocks from
3295 * different block group can end up in the same allocation cluster.
3296 * Calculating the exact overhead in the face of clustered allocation
3297 * requires either O(all block bitmaps) in memory or O(number of block
3298 * groups**2) in time. We will still calculate the superblock for
3299 * older file systems --- and if we come across with a bigalloc file
3300 * system with zero in s_overhead_clusters the estimate will be close to
3301 * correct especially for very large cluster sizes --- but for newer
3302 * file systems, it's better to calculate this figure once at mkfs
3303 * time, and store it in the superblock. If the superblock value is
3304 * present (even for non-bigalloc file systems), we will use it.
3305 */
3306 static int count_overhead(struct super_block *sb, ext4_group_t grp,
3307 char *buf)
3308 {
3309 struct ext4_sb_info *sbi = EXT4_SB(sb);
3310 struct ext4_group_desc *gdp;
3311 ext4_fsblk_t first_block, last_block, b;
3312 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3313 int s, j, count = 0;
3314
3315 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_BIGALLOC))
3316 return (ext4_bg_has_super(sb, grp) + ext4_bg_num_gdb(sb, grp) +
3317 sbi->s_itb_per_group + 2);
3318
3319 first_block = le32_to_cpu(sbi->s_es->s_first_data_block) +
3320 (grp * EXT4_BLOCKS_PER_GROUP(sb));
3321 last_block = first_block + EXT4_BLOCKS_PER_GROUP(sb) - 1;
3322 for (i = 0; i < ngroups; i++) {
3323 gdp = ext4_get_group_desc(sb, i, NULL);
3324 b = ext4_block_bitmap(sb, gdp);
3325 if (b >= first_block && b <= last_block) {
3326 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3327 count++;
3328 }
3329 b = ext4_inode_bitmap(sb, gdp);
3330 if (b >= first_block && b <= last_block) {
3331 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3332 count++;
3333 }
3334 b = ext4_inode_table(sb, gdp);
3335 if (b >= first_block && b + sbi->s_itb_per_group <= last_block)
3336 for (j = 0; j < sbi->s_itb_per_group; j++, b++) {
3337 int c = EXT4_B2C(sbi, b - first_block);
3338 ext4_set_bit(c, buf);
3339 count++;
3340 }
3341 if (i != grp)
3342 continue;
3343 s = 0;
3344 if (ext4_bg_has_super(sb, grp)) {
3345 ext4_set_bit(s++, buf);
3346 count++;
3347 }
3348 for (j = ext4_bg_num_gdb(sb, grp); j > 0; j--) {
3349 ext4_set_bit(EXT4_B2C(sbi, s++), buf);
3350 count++;
3351 }
3352 }
3353 if (!count)
3354 return 0;
3355 return EXT4_CLUSTERS_PER_GROUP(sb) -
3356 ext4_count_free(buf, EXT4_CLUSTERS_PER_GROUP(sb) / 8);
3357 }
3358
3359 /*
3360 * Compute the overhead and stash it in sbi->s_overhead
3361 */
3362 int ext4_calculate_overhead(struct super_block *sb)
3363 {
3364 struct ext4_sb_info *sbi = EXT4_SB(sb);
3365 struct ext4_super_block *es = sbi->s_es;
3366 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3367 ext4_fsblk_t overhead = 0;
3368 char *buf = (char *) get_zeroed_page(GFP_NOFS);
3369
3370 if (!buf)
3371 return -ENOMEM;
3372
3373 /*
3374 * Compute the overhead (FS structures). This is constant
3375 * for a given filesystem unless the number of block groups
3376 * changes so we cache the previous value until it does.
3377 */
3378
3379 /*
3380 * All of the blocks before first_data_block are overhead
3381 */
3382 overhead = EXT4_B2C(sbi, le32_to_cpu(es->s_first_data_block));
3383
3384 /*
3385 * Add the overhead found in each block group
3386 */
3387 for (i = 0; i < ngroups; i++) {
3388 int blks;
3389
3390 blks = count_overhead(sb, i, buf);
3391 overhead += blks;
3392 if (blks)
3393 memset(buf, 0, PAGE_SIZE);
3394 cond_resched();
3395 }
3396 /* Add the internal journal blocks as well */
3397 if (sbi->s_journal && !sbi->journal_bdev)
3398 overhead += EXT4_NUM_B2C(sbi, sbi->s_journal->j_maxlen);
3399
3400 sbi->s_overhead = overhead;
3401 smp_wmb();
3402 free_page((unsigned long) buf);
3403 return 0;
3404 }
3405
3406
3407 static ext4_fsblk_t ext4_calculate_resv_clusters(struct super_block *sb)
3408 {
3409 ext4_fsblk_t resv_clusters;
3410
3411 /*
3412 * There's no need to reserve anything when we aren't using extents.
3413 * The space estimates are exact, there are no unwritten extents,
3414 * hole punching doesn't need new metadata... This is needed especially
3415 * to keep ext2/3 backward compatibility.
3416 */
3417 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS))
3418 return 0;
3419 /*
3420 * By default we reserve 2% or 4096 clusters, whichever is smaller.
3421 * This should cover the situations where we can not afford to run
3422 * out of space like for example punch hole, or converting
3423 * unwritten extents in delalloc path. In most cases such
3424 * allocation would require 1, or 2 blocks, higher numbers are
3425 * very rare.
3426 */
3427 resv_clusters = ext4_blocks_count(EXT4_SB(sb)->s_es) >>
3428 EXT4_SB(sb)->s_cluster_bits;
3429
3430 do_div(resv_clusters, 50);
3431 resv_clusters = min_t(ext4_fsblk_t, resv_clusters, 4096);
3432
3433 return resv_clusters;
3434 }
3435
3436
3437 static int ext4_reserve_clusters(struct ext4_sb_info *sbi, ext4_fsblk_t count)
3438 {
3439 ext4_fsblk_t clusters = ext4_blocks_count(sbi->s_es) >>
3440 sbi->s_cluster_bits;
3441
3442 if (count >= clusters)
3443 return -EINVAL;
3444
3445 atomic64_set(&sbi->s_resv_clusters, count);
3446 return 0;
3447 }
3448
3449 static int ext4_fill_super(struct super_block *sb, void *data, int silent)
3450 {
3451 char *orig_data = kstrdup(data, GFP_KERNEL);
3452 struct buffer_head *bh;
3453 struct ext4_super_block *es = NULL;
3454 struct ext4_sb_info *sbi;
3455 ext4_fsblk_t block;
3456 ext4_fsblk_t sb_block = get_sb_block(&data);
3457 ext4_fsblk_t logical_sb_block;
3458 unsigned long offset = 0;
3459 unsigned long journal_devnum = 0;
3460 unsigned long def_mount_opts;
3461 struct inode *root;
3462 const char *descr;
3463 int ret = -ENOMEM;
3464 int blocksize, clustersize;
3465 unsigned int db_count;
3466 unsigned int i;
3467 int needs_recovery, has_huge_files, has_bigalloc;
3468 __u64 blocks_count;
3469 int err = 0;
3470 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
3471 ext4_group_t first_not_zeroed;
3472
3473 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
3474 if (!sbi)
3475 goto out_free_orig;
3476
3477 sbi->s_blockgroup_lock =
3478 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
3479 if (!sbi->s_blockgroup_lock) {
3480 kfree(sbi);
3481 goto out_free_orig;
3482 }
3483 sb->s_fs_info = sbi;
3484 sbi->s_sb = sb;
3485 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
3486 sbi->s_sb_block = sb_block;
3487 if (sb->s_bdev->bd_part)
3488 sbi->s_sectors_written_start =
3489 part_stat_read(sb->s_bdev->bd_part, sectors[1]);
3490
3491 /* Cleanup superblock name */
3492 strreplace(sb->s_id, '/', '!');
3493
3494 /* -EINVAL is default */
3495 ret = -EINVAL;
3496 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
3497 if (!blocksize) {
3498 ext4_msg(sb, KERN_ERR, "unable to set blocksize");
3499 goto out_fail;
3500 }
3501
3502 /*
3503 * The ext4 superblock will not be buffer aligned for other than 1kB
3504 * block sizes. We need to calculate the offset from buffer start.
3505 */
3506 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
3507 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3508 offset = do_div(logical_sb_block, blocksize);
3509 } else {
3510 logical_sb_block = sb_block;
3511 }
3512
3513 if (!(bh = sb_bread_unmovable(sb, logical_sb_block))) {
3514 ext4_msg(sb, KERN_ERR, "unable to read superblock");
3515 goto out_fail;
3516 }
3517 /*
3518 * Note: s_es must be initialized as soon as possible because
3519 * some ext4 macro-instructions depend on its value
3520 */
3521 es = (struct ext4_super_block *) (bh->b_data + offset);
3522 sbi->s_es = es;
3523 sb->s_magic = le16_to_cpu(es->s_magic);
3524 if (sb->s_magic != EXT4_SUPER_MAGIC)
3525 goto cantfind_ext4;
3526 sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
3527
3528 /* Warn if metadata_csum and gdt_csum are both set. */
3529 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3530 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) &&
3531 EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_GDT_CSUM))
3532 ext4_warning(sb, "metadata_csum and uninit_bg are "
3533 "redundant flags; please run fsck.");
3534
3535 /* Check for a known checksum algorithm */
3536 if (!ext4_verify_csum_type(sb, es)) {
3537 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3538 "unknown checksum algorithm.");
3539 silent = 1;
3540 goto cantfind_ext4;
3541 }
3542
3543 /* Load the checksum driver */
3544 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3545 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) {
3546 sbi->s_chksum_driver = crypto_alloc_shash("crc32c", 0, 0);
3547 if (IS_ERR(sbi->s_chksum_driver)) {
3548 ext4_msg(sb, KERN_ERR, "Cannot load crc32c driver.");
3549 ret = PTR_ERR(sbi->s_chksum_driver);
3550 sbi->s_chksum_driver = NULL;
3551 goto failed_mount;
3552 }
3553 }
3554
3555 /* Check superblock checksum */
3556 if (!ext4_superblock_csum_verify(sb, es)) {
3557 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3558 "invalid superblock checksum. Run e2fsck?");
3559 silent = 1;
3560 goto cantfind_ext4;
3561 }
3562
3563 /* Precompute checksum seed for all metadata */
3564 if (ext4_has_metadata_csum(sb))
3565 sbi->s_csum_seed = ext4_chksum(sbi, ~0, es->s_uuid,
3566 sizeof(es->s_uuid));
3567
3568 /* Set defaults before we parse the mount options */
3569 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
3570 set_opt(sb, INIT_INODE_TABLE);
3571 if (def_mount_opts & EXT4_DEFM_DEBUG)
3572 set_opt(sb, DEBUG);
3573 if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
3574 set_opt(sb, GRPID);
3575 if (def_mount_opts & EXT4_DEFM_UID16)
3576 set_opt(sb, NO_UID32);
3577 /* xattr user namespace & acls are now defaulted on */
3578 set_opt(sb, XATTR_USER);
3579 #ifdef CONFIG_EXT4_FS_POSIX_ACL
3580 set_opt(sb, POSIX_ACL);
3581 #endif
3582 /* don't forget to enable journal_csum when metadata_csum is enabled. */
3583 if (ext4_has_metadata_csum(sb))
3584 set_opt(sb, JOURNAL_CHECKSUM);
3585
3586 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
3587 set_opt(sb, JOURNAL_DATA);
3588 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
3589 set_opt(sb, ORDERED_DATA);
3590 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
3591 set_opt(sb, WRITEBACK_DATA);
3592
3593 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
3594 set_opt(sb, ERRORS_PANIC);
3595 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
3596 set_opt(sb, ERRORS_CONT);
3597 else
3598 set_opt(sb, ERRORS_RO);
3599 /* block_validity enabled by default; disable with noblock_validity */
3600 set_opt(sb, BLOCK_VALIDITY);
3601 if (def_mount_opts & EXT4_DEFM_DISCARD)
3602 set_opt(sb, DISCARD);
3603
3604 sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));
3605 sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid));
3606 sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
3607 sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
3608 sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
3609
3610 if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0)
3611 set_opt(sb, BARRIER);
3612
3613 /*
3614 * enable delayed allocation by default
3615 * Use -o nodelalloc to turn it off
3616 */
3617 if (!IS_EXT3_SB(sb) && !IS_EXT2_SB(sb) &&
3618 ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0))
3619 set_opt(sb, DELALLOC);
3620
3621 /*
3622 * set default s_li_wait_mult for lazyinit, for the case there is
3623 * no mount option specified.
3624 */
3625 sbi->s_li_wait_mult = EXT4_DEF_LI_WAIT_MULT;
3626
3627 if (!parse_options((char *) sbi->s_es->s_mount_opts, sb,
3628 &journal_devnum, &journal_ioprio, 0)) {
3629 ext4_msg(sb, KERN_WARNING,
3630 "failed to parse options in superblock: %s",
3631 sbi->s_es->s_mount_opts);
3632 }
3633 sbi->s_def_mount_opt = sbi->s_mount_opt;
3634 if (!parse_options((char *) data, sb, &journal_devnum,
3635 &journal_ioprio, 0))
3636 goto failed_mount;
3637
3638 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
3639 printk_once(KERN_WARNING "EXT4-fs: Warning: mounting "
3640 "with data=journal disables delayed "
3641 "allocation and O_DIRECT support!\n");
3642 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
3643 ext4_msg(sb, KERN_ERR, "can't mount with "
3644 "both data=journal and delalloc");
3645 goto failed_mount;
3646 }
3647 if (test_opt(sb, DIOREAD_NOLOCK)) {
3648 ext4_msg(sb, KERN_ERR, "can't mount with "
3649 "both data=journal and dioread_nolock");
3650 goto failed_mount;
3651 }
3652 if (test_opt(sb, DAX)) {
3653 ext4_msg(sb, KERN_ERR, "can't mount with "
3654 "both data=journal and dax");
3655 goto failed_mount;
3656 }
3657 if (test_opt(sb, DELALLOC))
3658 clear_opt(sb, DELALLOC);
3659 } else {
3660 sb->s_iflags |= SB_I_CGROUPWB;
3661 }
3662
3663 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
3664 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
3665
3666 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
3667 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
3668 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
3669 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
3670 ext4_msg(sb, KERN_WARNING,
3671 "feature flags set on rev 0 fs, "
3672 "running e2fsck is recommended");
3673
3674 if (es->s_creator_os == cpu_to_le32(EXT4_OS_HURD)) {
3675 set_opt2(sb, HURD_COMPAT);
3676 if (EXT4_HAS_INCOMPAT_FEATURE(sb,
3677 EXT4_FEATURE_INCOMPAT_64BIT)) {
3678 ext4_msg(sb, KERN_ERR,
3679 "The Hurd can't support 64-bit file systems");
3680 goto failed_mount;
3681 }
3682 }
3683
3684 if (IS_EXT2_SB(sb)) {
3685 if (ext2_feature_set_ok(sb))
3686 ext4_msg(sb, KERN_INFO, "mounting ext2 file system "
3687 "using the ext4 subsystem");
3688 else {
3689 ext4_msg(sb, KERN_ERR, "couldn't mount as ext2 due "
3690 "to feature incompatibilities");
3691 goto failed_mount;
3692 }
3693 }
3694
3695 if (IS_EXT3_SB(sb)) {
3696 if (ext3_feature_set_ok(sb))
3697 ext4_msg(sb, KERN_INFO, "mounting ext3 file system "
3698 "using the ext4 subsystem");
3699 else {
3700 ext4_msg(sb, KERN_ERR, "couldn't mount as ext3 due "
3701 "to feature incompatibilities");
3702 goto failed_mount;
3703 }
3704 }
3705
3706 /*
3707 * Check feature flags regardless of the revision level, since we
3708 * previously didn't change the revision level when setting the flags,
3709 * so there is a chance incompat flags are set on a rev 0 filesystem.
3710 */
3711 if (!ext4_feature_set_ok(sb, (sb->s_flags & MS_RDONLY)))
3712 goto failed_mount;
3713
3714 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
3715 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
3716 blocksize > EXT4_MAX_BLOCK_SIZE) {
3717 ext4_msg(sb, KERN_ERR,
3718 "Unsupported filesystem blocksize %d", blocksize);
3719 goto failed_mount;
3720 }
3721
3722 if (sbi->s_mount_opt & EXT4_MOUNT_DAX) {
3723 if (blocksize != PAGE_SIZE) {
3724 ext4_msg(sb, KERN_ERR,
3725 "error: unsupported blocksize for dax");
3726 goto failed_mount;
3727 }
3728 if (!sb->s_bdev->bd_disk->fops->direct_access) {
3729 ext4_msg(sb, KERN_ERR,
3730 "error: device does not support dax");
3731 goto failed_mount;
3732 }
3733 }
3734
3735 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_ENCRYPT) &&
3736 es->s_encryption_level) {
3737 ext4_msg(sb, KERN_ERR, "Unsupported encryption level %d",
3738 es->s_encryption_level);
3739 goto failed_mount;
3740 }
3741
3742 if (sb->s_blocksize != blocksize) {
3743 /* Validate the filesystem blocksize */
3744 if (!sb_set_blocksize(sb, blocksize)) {
3745 ext4_msg(sb, KERN_ERR, "bad block size %d",
3746 blocksize);
3747 goto failed_mount;
3748 }
3749
3750 brelse(bh);
3751 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3752 offset = do_div(logical_sb_block, blocksize);
3753 bh = sb_bread_unmovable(sb, logical_sb_block);
3754 if (!bh) {
3755 ext4_msg(sb, KERN_ERR,
3756 "Can't read superblock on 2nd try");
3757 goto failed_mount;
3758 }
3759 es = (struct ext4_super_block *)(bh->b_data + offset);
3760 sbi->s_es = es;
3761 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
3762 ext4_msg(sb, KERN_ERR,
3763 "Magic mismatch, very weird!");
3764 goto failed_mount;
3765 }
3766 }
3767
3768 has_huge_files = EXT4_HAS_RO_COMPAT_FEATURE(sb,
3769 EXT4_FEATURE_RO_COMPAT_HUGE_FILE);
3770 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
3771 has_huge_files);
3772 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
3773
3774 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
3775 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
3776 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
3777 } else {
3778 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
3779 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
3780 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
3781 (!is_power_of_2(sbi->s_inode_size)) ||
3782 (sbi->s_inode_size > blocksize)) {
3783 ext4_msg(sb, KERN_ERR,
3784 "unsupported inode size: %d",
3785 sbi->s_inode_size);
3786 goto failed_mount;
3787 }
3788 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
3789 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
3790 }
3791
3792 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
3793 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
3794 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
3795 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
3796 !is_power_of_2(sbi->s_desc_size)) {
3797 ext4_msg(sb, KERN_ERR,
3798 "unsupported descriptor size %lu",
3799 sbi->s_desc_size);
3800 goto failed_mount;
3801 }
3802 } else
3803 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
3804
3805 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
3806 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
3807 if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
3808 goto cantfind_ext4;
3809
3810 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
3811 if (sbi->s_inodes_per_block == 0)
3812 goto cantfind_ext4;
3813 sbi->s_itb_per_group = sbi->s_inodes_per_group /
3814 sbi->s_inodes_per_block;
3815 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
3816 sbi->s_sbh = bh;
3817 sbi->s_mount_state = le16_to_cpu(es->s_state);
3818 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
3819 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
3820
3821 for (i = 0; i < 4; i++)
3822 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
3823 sbi->s_def_hash_version = es->s_def_hash_version;
3824 if (EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_DIR_INDEX)) {
3825 i = le32_to_cpu(es->s_flags);
3826 if (i & EXT2_FLAGS_UNSIGNED_HASH)
3827 sbi->s_hash_unsigned = 3;
3828 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
3829 #ifdef __CHAR_UNSIGNED__
3830 if (!(sb->s_flags & MS_RDONLY))
3831 es->s_flags |=
3832 cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
3833 sbi->s_hash_unsigned = 3;
3834 #else
3835 if (!(sb->s_flags & MS_RDONLY))
3836 es->s_flags |=
3837 cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
3838 #endif
3839 }
3840 }
3841
3842 /* Handle clustersize */
3843 clustersize = BLOCK_SIZE << le32_to_cpu(es->s_log_cluster_size);
3844 has_bigalloc = EXT4_HAS_RO_COMPAT_FEATURE(sb,
3845 EXT4_FEATURE_RO_COMPAT_BIGALLOC);
3846 if (has_bigalloc) {
3847 if (clustersize < blocksize) {
3848 ext4_msg(sb, KERN_ERR,
3849 "cluster size (%d) smaller than "
3850 "block size (%d)", clustersize, blocksize);
3851 goto failed_mount;
3852 }
3853 sbi->s_cluster_bits = le32_to_cpu(es->s_log_cluster_size) -
3854 le32_to_cpu(es->s_log_block_size);
3855 sbi->s_clusters_per_group =
3856 le32_to_cpu(es->s_clusters_per_group);
3857 if (sbi->s_clusters_per_group > blocksize * 8) {
3858 ext4_msg(sb, KERN_ERR,
3859 "#clusters per group too big: %lu",
3860 sbi->s_clusters_per_group);
3861 goto failed_mount;
3862 }
3863 if (sbi->s_blocks_per_group !=
3864 (sbi->s_clusters_per_group * (clustersize / blocksize))) {
3865 ext4_msg(sb, KERN_ERR, "blocks per group (%lu) and "
3866 "clusters per group (%lu) inconsistent",
3867 sbi->s_blocks_per_group,
3868 sbi->s_clusters_per_group);
3869 goto failed_mount;
3870 }
3871 } else {
3872 if (clustersize != blocksize) {
3873 ext4_warning(sb, "fragment/cluster size (%d) != "
3874 "block size (%d)", clustersize,
3875 blocksize);
3876 clustersize = blocksize;
3877 }
3878 if (sbi->s_blocks_per_group > blocksize * 8) {
3879 ext4_msg(sb, KERN_ERR,
3880 "#blocks per group too big: %lu",
3881 sbi->s_blocks_per_group);
3882 goto failed_mount;
3883 }
3884 sbi->s_clusters_per_group = sbi->s_blocks_per_group;
3885 sbi->s_cluster_bits = 0;
3886 }
3887 sbi->s_cluster_ratio = clustersize / blocksize;
3888
3889 if (sbi->s_inodes_per_group > blocksize * 8) {
3890 ext4_msg(sb, KERN_ERR,
3891 "#inodes per group too big: %lu",
3892 sbi->s_inodes_per_group);
3893 goto failed_mount;
3894 }
3895
3896 /* Do we have standard group size of clustersize * 8 blocks ? */
3897 if (sbi->s_blocks_per_group == clustersize << 3)
3898 set_opt2(sb, STD_GROUP_SIZE);
3899
3900 /*
3901 * Test whether we have more sectors than will fit in sector_t,
3902 * and whether the max offset is addressable by the page cache.
3903 */
3904 err = generic_check_addressable(sb->s_blocksize_bits,
3905 ext4_blocks_count(es));
3906 if (err) {
3907 ext4_msg(sb, KERN_ERR, "filesystem"
3908 " too large to mount safely on this system");
3909 if (sizeof(sector_t) < 8)
3910 ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled");
3911 goto failed_mount;
3912 }
3913
3914 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
3915 goto cantfind_ext4;
3916
3917 /* check blocks count against device size */
3918 blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
3919 if (blocks_count && ext4_blocks_count(es) > blocks_count) {
3920 ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
3921 "exceeds size of device (%llu blocks)",
3922 ext4_blocks_count(es), blocks_count);
3923 goto failed_mount;
3924 }
3925
3926 /*
3927 * It makes no sense for the first data block to be beyond the end
3928 * of the filesystem.
3929 */
3930 if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
3931 ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
3932 "block %u is beyond end of filesystem (%llu)",
3933 le32_to_cpu(es->s_first_data_block),
3934 ext4_blocks_count(es));
3935 goto failed_mount;
3936 }
3937 blocks_count = (ext4_blocks_count(es) -
3938 le32_to_cpu(es->s_first_data_block) +
3939 EXT4_BLOCKS_PER_GROUP(sb) - 1);
3940 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
3941 if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
3942 ext4_msg(sb, KERN_WARNING, "groups count too large: %u "
3943 "(block count %llu, first data block %u, "
3944 "blocks per group %lu)", sbi->s_groups_count,
3945 ext4_blocks_count(es),
3946 le32_to_cpu(es->s_first_data_block),
3947 EXT4_BLOCKS_PER_GROUP(sb));
3948 goto failed_mount;
3949 }
3950 sbi->s_groups_count = blocks_count;
3951 sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
3952 (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
3953 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
3954 EXT4_DESC_PER_BLOCK(sb);
3955 sbi->s_group_desc = ext4_kvmalloc(db_count *
3956 sizeof(struct buffer_head *),
3957 GFP_KERNEL);
3958 if (sbi->s_group_desc == NULL) {
3959 ext4_msg(sb, KERN_ERR, "not enough memory");
3960 ret = -ENOMEM;
3961 goto failed_mount;
3962 }
3963
3964 if (ext4_proc_root)
3965 sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);
3966
3967 if (sbi->s_proc)
3968 proc_create_data("options", S_IRUGO, sbi->s_proc,
3969 &ext4_seq_options_fops, sb);
3970
3971 bgl_lock_init(sbi->s_blockgroup_lock);
3972
3973 for (i = 0; i < db_count; i++) {
3974 block = descriptor_loc(sb, logical_sb_block, i);
3975 sbi->s_group_desc[i] = sb_bread_unmovable(sb, block);
3976 if (!sbi->s_group_desc[i]) {
3977 ext4_msg(sb, KERN_ERR,
3978 "can't read group descriptor %d", i);
3979 db_count = i;
3980 goto failed_mount2;
3981 }
3982 }
3983 if (!ext4_check_descriptors(sb, &first_not_zeroed)) {
3984 ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
3985 goto failed_mount2;
3986 }
3987
3988 sbi->s_gdb_count = db_count;
3989 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
3990 spin_lock_init(&sbi->s_next_gen_lock);
3991
3992 setup_timer(&sbi->s_err_report, print_daily_error_info,
3993 (unsigned long) sb);
3994
3995 /* Register extent status tree shrinker */
3996 if (ext4_es_register_shrinker(sbi))
3997 goto failed_mount3;
3998
3999 sbi->s_stripe = ext4_get_stripe_size(sbi);
4000 sbi->s_extent_max_zeroout_kb = 32;
4001
4002 /*
4003 * set up enough so that it can read an inode
4004 */
4005 sb->s_op = &ext4_sops;
4006 sb->s_export_op = &ext4_export_ops;
4007 sb->s_xattr = ext4_xattr_handlers;
4008 #ifdef CONFIG_QUOTA
4009 sb->dq_op = &ext4_quota_operations;
4010 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA))
4011 sb->s_qcop = &dquot_quotactl_sysfile_ops;
4012 else
4013 sb->s_qcop = &ext4_qctl_operations;
4014 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
4015 #endif
4016 memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
4017
4018 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
4019 mutex_init(&sbi->s_orphan_lock);
4020
4021 sb->s_root = NULL;
4022
4023 needs_recovery = (es->s_last_orphan != 0 ||
4024 EXT4_HAS_INCOMPAT_FEATURE(sb,
4025 EXT4_FEATURE_INCOMPAT_RECOVER));
4026
4027 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_MMP) &&
4028 !(sb->s_flags & MS_RDONLY))
4029 if (ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block)))
4030 goto failed_mount3a;
4031
4032 /*
4033 * The first inode we look at is the journal inode. Don't try
4034 * root first: it may be modified in the journal!
4035 */
4036 if (!test_opt(sb, NOLOAD) &&
4037 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
4038 if (ext4_load_journal(sb, es, journal_devnum))
4039 goto failed_mount3a;
4040 } else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) &&
4041 EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
4042 ext4_msg(sb, KERN_ERR, "required journal recovery "
4043 "suppressed and not mounted read-only");
4044 goto failed_mount_wq;
4045 } else {
4046 clear_opt(sb, DATA_FLAGS);
4047 sbi->s_journal = NULL;
4048 needs_recovery = 0;
4049 goto no_journal;
4050 }
4051
4052 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT) &&
4053 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
4054 JBD2_FEATURE_INCOMPAT_64BIT)) {
4055 ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
4056 goto failed_mount_wq;
4057 }
4058
4059 if (!set_journal_csum_feature_set(sb)) {
4060 ext4_msg(sb, KERN_ERR, "Failed to set journal checksum "
4061 "feature set");
4062 goto failed_mount_wq;
4063 }
4064
4065 /* We have now updated the journal if required, so we can
4066 * validate the data journaling mode. */
4067 switch (test_opt(sb, DATA_FLAGS)) {
4068 case 0:
4069 /* No mode set, assume a default based on the journal
4070 * capabilities: ORDERED_DATA if the journal can
4071 * cope, else JOURNAL_DATA
4072 */
4073 if (jbd2_journal_check_available_features
4074 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
4075 set_opt(sb, ORDERED_DATA);
4076 else
4077 set_opt(sb, JOURNAL_DATA);
4078 break;
4079
4080 case EXT4_MOUNT_ORDERED_DATA:
4081 case EXT4_MOUNT_WRITEBACK_DATA:
4082 if (!jbd2_journal_check_available_features
4083 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
4084 ext4_msg(sb, KERN_ERR, "Journal does not support "
4085 "requested data journaling mode");
4086 goto failed_mount_wq;
4087 }
4088 default:
4089 break;
4090 }
4091 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
4092
4093 sbi->s_journal->j_commit_callback = ext4_journal_commit_callback;
4094
4095 no_journal:
4096 if (ext4_mballoc_ready) {
4097 sbi->s_mb_cache = ext4_xattr_create_cache(sb->s_id);
4098 if (!sbi->s_mb_cache) {
4099 ext4_msg(sb, KERN_ERR, "Failed to create an mb_cache");
4100 goto failed_mount_wq;
4101 }
4102 }
4103
4104 if ((DUMMY_ENCRYPTION_ENABLED(sbi) ||
4105 EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_ENCRYPT)) &&
4106 (blocksize != PAGE_CACHE_SIZE)) {
4107 ext4_msg(sb, KERN_ERR,
4108 "Unsupported blocksize for fs encryption");
4109 goto failed_mount_wq;
4110 }
4111
4112 if (DUMMY_ENCRYPTION_ENABLED(sbi) &&
4113 !(sb->s_flags & MS_RDONLY) &&
4114 !EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_ENCRYPT)) {
4115 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_ENCRYPT);
4116 ext4_commit_super(sb, 1);
4117 }
4118
4119 /*
4120 * Get the # of file system overhead blocks from the
4121 * superblock if present.
4122 */
4123 if (es->s_overhead_clusters)
4124 sbi->s_overhead = le32_to_cpu(es->s_overhead_clusters);
4125 else {
4126 err = ext4_calculate_overhead(sb);
4127 if (err)
4128 goto failed_mount_wq;
4129 }
4130
4131 /*
4132 * The maximum number of concurrent works can be high and
4133 * concurrency isn't really necessary. Limit it to 1.
4134 */
4135 EXT4_SB(sb)->rsv_conversion_wq =
4136 alloc_workqueue("ext4-rsv-conversion", WQ_MEM_RECLAIM | WQ_UNBOUND, 1);
4137 if (!EXT4_SB(sb)->rsv_conversion_wq) {
4138 printk(KERN_ERR "EXT4-fs: failed to create workqueue\n");
4139 ret = -ENOMEM;
4140 goto failed_mount4;
4141 }
4142
4143 /*
4144 * The jbd2_journal_load will have done any necessary log recovery,
4145 * so we can safely mount the rest of the filesystem now.
4146 */
4147
4148 root = ext4_iget(sb, EXT4_ROOT_INO);
4149 if (IS_ERR(root)) {
4150 ext4_msg(sb, KERN_ERR, "get root inode failed");
4151 ret = PTR_ERR(root);
4152 root = NULL;
4153 goto failed_mount4;
4154 }
4155 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
4156 ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
4157 iput(root);
4158 goto failed_mount4;
4159 }
4160 sb->s_root = d_make_root(root);
4161 if (!sb->s_root) {
4162 ext4_msg(sb, KERN_ERR, "get root dentry failed");
4163 ret = -ENOMEM;
4164 goto failed_mount4;
4165 }
4166
4167 if (ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY))
4168 sb->s_flags |= MS_RDONLY;
4169
4170 /* determine the minimum size of new large inodes, if present */
4171 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
4172 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
4173 EXT4_GOOD_OLD_INODE_SIZE;
4174 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
4175 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) {
4176 if (sbi->s_want_extra_isize <
4177 le16_to_cpu(es->s_want_extra_isize))
4178 sbi->s_want_extra_isize =
4179 le16_to_cpu(es->s_want_extra_isize);
4180 if (sbi->s_want_extra_isize <
4181 le16_to_cpu(es->s_min_extra_isize))
4182 sbi->s_want_extra_isize =
4183 le16_to_cpu(es->s_min_extra_isize);
4184 }
4185 }
4186 /* Check if enough inode space is available */
4187 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
4188 sbi->s_inode_size) {
4189 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
4190 EXT4_GOOD_OLD_INODE_SIZE;
4191 ext4_msg(sb, KERN_INFO, "required extra inode space not"
4192 "available");
4193 }
4194
4195 err = ext4_reserve_clusters(sbi, ext4_calculate_resv_clusters(sb));
4196 if (err) {
4197 ext4_msg(sb, KERN_ERR, "failed to reserve %llu clusters for "
4198 "reserved pool", ext4_calculate_resv_clusters(sb));
4199 goto failed_mount4a;
4200 }
4201
4202 err = ext4_setup_system_zone(sb);
4203 if (err) {
4204 ext4_msg(sb, KERN_ERR, "failed to initialize system "
4205 "zone (%d)", err);
4206 goto failed_mount4a;
4207 }
4208
4209 ext4_ext_init(sb);
4210 err = ext4_mb_init(sb);
4211 if (err) {
4212 ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)",
4213 err);
4214 goto failed_mount5;
4215 }
4216
4217 block = ext4_count_free_clusters(sb);
4218 ext4_free_blocks_count_set(sbi->s_es,
4219 EXT4_C2B(sbi, block));
4220 err = percpu_counter_init(&sbi->s_freeclusters_counter, block,
4221 GFP_KERNEL);
4222 if (!err) {
4223 unsigned long freei = ext4_count_free_inodes(sb);
4224 sbi->s_es->s_free_inodes_count = cpu_to_le32(freei);
4225 err = percpu_counter_init(&sbi->s_freeinodes_counter, freei,
4226 GFP_KERNEL);
4227 }
4228 if (!err)
4229 err = percpu_counter_init(&sbi->s_dirs_counter,
4230 ext4_count_dirs(sb), GFP_KERNEL);
4231 if (!err)
4232 err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0,
4233 GFP_KERNEL);
4234 if (err) {
4235 ext4_msg(sb, KERN_ERR, "insufficient memory");
4236 goto failed_mount6;
4237 }
4238
4239 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
4240 if (!ext4_fill_flex_info(sb)) {
4241 ext4_msg(sb, KERN_ERR,
4242 "unable to initialize "
4243 "flex_bg meta info!");
4244 goto failed_mount6;
4245 }
4246
4247 err = ext4_register_li_request(sb, first_not_zeroed);
4248 if (err)
4249 goto failed_mount6;
4250
4251 sbi->s_kobj.kset = ext4_kset;
4252 init_completion(&sbi->s_kobj_unregister);
4253 err = kobject_init_and_add(&sbi->s_kobj, &ext4_ktype, NULL,
4254 "%s", sb->s_id);
4255 if (err)
4256 goto failed_mount7;
4257
4258 #ifdef CONFIG_QUOTA
4259 /* Enable quota usage during mount. */
4260 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) &&
4261 !(sb->s_flags & MS_RDONLY)) {
4262 err = ext4_enable_quotas(sb);
4263 if (err)
4264 goto failed_mount8;
4265 }
4266 #endif /* CONFIG_QUOTA */
4267
4268 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
4269 ext4_orphan_cleanup(sb, es);
4270 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
4271 if (needs_recovery) {
4272 ext4_msg(sb, KERN_INFO, "recovery complete");
4273 ext4_mark_recovery_complete(sb, es);
4274 }
4275 if (EXT4_SB(sb)->s_journal) {
4276 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
4277 descr = " journalled data mode";
4278 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
4279 descr = " ordered data mode";
4280 else
4281 descr = " writeback data mode";
4282 } else
4283 descr = "out journal";
4284
4285 if (test_opt(sb, DISCARD)) {
4286 struct request_queue *q = bdev_get_queue(sb->s_bdev);
4287 if (!blk_queue_discard(q))
4288 ext4_msg(sb, KERN_WARNING,
4289 "mounting with \"discard\" option, but "
4290 "the device does not support discard");
4291 }
4292
4293 if (___ratelimit(&ext4_mount_msg_ratelimit, "EXT4-fs mount"))
4294 ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. "
4295 "Opts: %s%s%s", descr, sbi->s_es->s_mount_opts,
4296 *sbi->s_es->s_mount_opts ? "; " : "", orig_data);
4297
4298 if (es->s_error_count)
4299 mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */
4300
4301 /* Enable message ratelimiting. Default is 10 messages per 5 secs. */
4302 ratelimit_state_init(&sbi->s_err_ratelimit_state, 5 * HZ, 10);
4303 ratelimit_state_init(&sbi->s_warning_ratelimit_state, 5 * HZ, 10);
4304 ratelimit_state_init(&sbi->s_msg_ratelimit_state, 5 * HZ, 10);
4305
4306 kfree(orig_data);
4307 return 0;
4308
4309 cantfind_ext4:
4310 if (!silent)
4311 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
4312 goto failed_mount;
4313
4314 #ifdef CONFIG_QUOTA
4315 failed_mount8:
4316 kobject_del(&sbi->s_kobj);
4317 #endif
4318 failed_mount7:
4319 ext4_unregister_li_request(sb);
4320 failed_mount6:
4321 ext4_mb_release(sb);
4322 if (sbi->s_flex_groups)
4323 kvfree(sbi->s_flex_groups);
4324 percpu_counter_destroy(&sbi->s_freeclusters_counter);
4325 percpu_counter_destroy(&sbi->s_freeinodes_counter);
4326 percpu_counter_destroy(&sbi->s_dirs_counter);
4327 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
4328 failed_mount5:
4329 ext4_ext_release(sb);
4330 ext4_release_system_zone(sb);
4331 failed_mount4a:
4332 dput(sb->s_root);
4333 sb->s_root = NULL;
4334 failed_mount4:
4335 ext4_msg(sb, KERN_ERR, "mount failed");
4336 if (EXT4_SB(sb)->rsv_conversion_wq)
4337 destroy_workqueue(EXT4_SB(sb)->rsv_conversion_wq);
4338 failed_mount_wq:
4339 if (sbi->s_journal) {
4340 jbd2_journal_destroy(sbi->s_journal);
4341 sbi->s_journal = NULL;
4342 }
4343 failed_mount3a:
4344 ext4_es_unregister_shrinker(sbi);
4345 failed_mount3:
4346 del_timer_sync(&sbi->s_err_report);
4347 if (sbi->s_mmp_tsk)
4348 kthread_stop(sbi->s_mmp_tsk);
4349 failed_mount2:
4350 for (i = 0; i < db_count; i++)
4351 brelse(sbi->s_group_desc[i]);
4352 kvfree(sbi->s_group_desc);
4353 failed_mount:
4354 if (sbi->s_chksum_driver)
4355 crypto_free_shash(sbi->s_chksum_driver);
4356 if (sbi->s_proc) {
4357 remove_proc_entry("options", sbi->s_proc);
4358 remove_proc_entry(sb->s_id, ext4_proc_root);
4359 }
4360 #ifdef CONFIG_QUOTA
4361 for (i = 0; i < EXT4_MAXQUOTAS; i++)
4362 kfree(sbi->s_qf_names[i]);
4363 #endif
4364 ext4_blkdev_remove(sbi);
4365 brelse(bh);
4366 out_fail:
4367 sb->s_fs_info = NULL;
4368 kfree(sbi->s_blockgroup_lock);
4369 kfree(sbi);
4370 out_free_orig:
4371 kfree(orig_data);
4372 return err ? err : ret;
4373 }
4374
4375 /*
4376 * Setup any per-fs journal parameters now. We'll do this both on
4377 * initial mount, once the journal has been initialised but before we've
4378 * done any recovery; and again on any subsequent remount.
4379 */
4380 static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
4381 {
4382 struct ext4_sb_info *sbi = EXT4_SB(sb);
4383
4384 journal->j_commit_interval = sbi->s_commit_interval;
4385 journal->j_min_batch_time = sbi->s_min_batch_time;
4386 journal->j_max_batch_time = sbi->s_max_batch_time;
4387
4388 write_lock(&journal->j_state_lock);
4389 if (test_opt(sb, BARRIER))
4390 journal->j_flags |= JBD2_BARRIER;
4391 else
4392 journal->j_flags &= ~JBD2_BARRIER;
4393 if (test_opt(sb, DATA_ERR_ABORT))
4394 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
4395 else
4396 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
4397 write_unlock(&journal->j_state_lock);
4398 }
4399
4400 static journal_t *ext4_get_journal(struct super_block *sb,
4401 unsigned int journal_inum)
4402 {
4403 struct inode *journal_inode;
4404 journal_t *journal;
4405
4406 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4407
4408 /* First, test for the existence of a valid inode on disk. Bad
4409 * things happen if we iget() an unused inode, as the subsequent
4410 * iput() will try to delete it. */
4411
4412 journal_inode = ext4_iget(sb, journal_inum);
4413 if (IS_ERR(journal_inode)) {
4414 ext4_msg(sb, KERN_ERR, "no journal found");
4415 return NULL;
4416 }
4417 if (!journal_inode->i_nlink) {
4418 make_bad_inode(journal_inode);
4419 iput(journal_inode);
4420 ext4_msg(sb, KERN_ERR, "journal inode is deleted");
4421 return NULL;
4422 }
4423
4424 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
4425 journal_inode, journal_inode->i_size);
4426 if (!S_ISREG(journal_inode->i_mode)) {
4427 ext4_msg(sb, KERN_ERR, "invalid journal inode");
4428 iput(journal_inode);
4429 return NULL;
4430 }
4431
4432 journal = jbd2_journal_init_inode(journal_inode);
4433 if (!journal) {
4434 ext4_msg(sb, KERN_ERR, "Could not load journal inode");
4435 iput(journal_inode);
4436 return NULL;
4437 }
4438 journal->j_private = sb;
4439 ext4_init_journal_params(sb, journal);
4440 return journal;
4441 }
4442
4443 static journal_t *ext4_get_dev_journal(struct super_block *sb,
4444 dev_t j_dev)
4445 {
4446 struct buffer_head *bh;
4447 journal_t *journal;
4448 ext4_fsblk_t start;
4449 ext4_fsblk_t len;
4450 int hblock, blocksize;
4451 ext4_fsblk_t sb_block;
4452 unsigned long offset;
4453 struct ext4_super_block *es;
4454 struct block_device *bdev;
4455
4456 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4457
4458 bdev = ext4_blkdev_get(j_dev, sb);
4459 if (bdev == NULL)
4460 return NULL;
4461
4462 blocksize = sb->s_blocksize;
4463 hblock = bdev_logical_block_size(bdev);
4464 if (blocksize < hblock) {
4465 ext4_msg(sb, KERN_ERR,
4466 "blocksize too small for journal device");
4467 goto out_bdev;
4468 }
4469
4470 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
4471 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
4472 set_blocksize(bdev, blocksize);
4473 if (!(bh = __bread(bdev, sb_block, blocksize))) {
4474 ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
4475 "external journal");
4476 goto out_bdev;
4477 }
4478
4479 es = (struct ext4_super_block *) (bh->b_data + offset);
4480 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
4481 !(le32_to_cpu(es->s_feature_incompat) &
4482 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
4483 ext4_msg(sb, KERN_ERR, "external journal has "
4484 "bad superblock");
4485 brelse(bh);
4486 goto out_bdev;
4487 }
4488
4489 if ((le32_to_cpu(es->s_feature_ro_compat) &
4490 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) &&
4491 es->s_checksum != ext4_superblock_csum(sb, es)) {
4492 ext4_msg(sb, KERN_ERR, "external journal has "
4493 "corrupt superblock");
4494 brelse(bh);
4495 goto out_bdev;
4496 }
4497
4498 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
4499 ext4_msg(sb, KERN_ERR, "journal UUID does not match");
4500 brelse(bh);
4501 goto out_bdev;
4502 }
4503
4504 len = ext4_blocks_count(es);
4505 start = sb_block + 1;
4506 brelse(bh); /* we're done with the superblock */
4507
4508 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
4509 start, len, blocksize);
4510 if (!journal) {
4511 ext4_msg(sb, KERN_ERR, "failed to create device journal");
4512 goto out_bdev;
4513 }
4514 journal->j_private = sb;
4515 ll_rw_block(READ | REQ_META | REQ_PRIO, 1, &journal->j_sb_buffer);
4516 wait_on_buffer(journal->j_sb_buffer);
4517 if (!buffer_uptodate(journal->j_sb_buffer)) {
4518 ext4_msg(sb, KERN_ERR, "I/O error on journal device");
4519 goto out_journal;
4520 }
4521 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
4522 ext4_msg(sb, KERN_ERR, "External journal has more than one "
4523 "user (unsupported) - %d",
4524 be32_to_cpu(journal->j_superblock->s_nr_users));
4525 goto out_journal;
4526 }
4527 EXT4_SB(sb)->journal_bdev = bdev;
4528 ext4_init_journal_params(sb, journal);
4529 return journal;
4530
4531 out_journal:
4532 jbd2_journal_destroy(journal);
4533 out_bdev:
4534 ext4_blkdev_put(bdev);
4535 return NULL;
4536 }
4537
4538 static int ext4_load_journal(struct super_block *sb,
4539 struct ext4_super_block *es,
4540 unsigned long journal_devnum)
4541 {
4542 journal_t *journal;
4543 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
4544 dev_t journal_dev;
4545 int err = 0;
4546 int really_read_only;
4547
4548 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4549
4550 if (journal_devnum &&
4551 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
4552 ext4_msg(sb, KERN_INFO, "external journal device major/minor "
4553 "numbers have changed");
4554 journal_dev = new_decode_dev(journal_devnum);
4555 } else
4556 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
4557
4558 really_read_only = bdev_read_only(sb->s_bdev);
4559
4560 /*
4561 * Are we loading a blank journal or performing recovery after a
4562 * crash? For recovery, we need to check in advance whether we
4563 * can get read-write access to the device.
4564 */
4565 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
4566 if (sb->s_flags & MS_RDONLY) {
4567 ext4_msg(sb, KERN_INFO, "INFO: recovery "
4568 "required on readonly filesystem");
4569 if (really_read_only) {
4570 ext4_msg(sb, KERN_ERR, "write access "
4571 "unavailable, cannot proceed");
4572 return -EROFS;
4573 }
4574 ext4_msg(sb, KERN_INFO, "write access will "
4575 "be enabled during recovery");
4576 }
4577 }
4578
4579 if (journal_inum && journal_dev) {
4580 ext4_msg(sb, KERN_ERR, "filesystem has both journal "
4581 "and inode journals!");
4582 return -EINVAL;
4583 }
4584
4585 if (journal_inum) {
4586 if (!(journal = ext4_get_journal(sb, journal_inum)))
4587 return -EINVAL;
4588 } else {
4589 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
4590 return -EINVAL;
4591 }
4592
4593 if (!(journal->j_flags & JBD2_BARRIER))
4594 ext4_msg(sb, KERN_INFO, "barriers disabled");
4595
4596 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
4597 err = jbd2_journal_wipe(journal, !really_read_only);
4598 if (!err) {
4599 char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL);
4600 if (save)
4601 memcpy(save, ((char *) es) +
4602 EXT4_S_ERR_START, EXT4_S_ERR_LEN);
4603 err = jbd2_journal_load(journal);
4604 if (save)
4605 memcpy(((char *) es) + EXT4_S_ERR_START,
4606 save, EXT4_S_ERR_LEN);
4607 kfree(save);
4608 }
4609
4610 if (err) {
4611 ext4_msg(sb, KERN_ERR, "error loading journal");
4612 jbd2_journal_destroy(journal);
4613 return err;
4614 }
4615
4616 EXT4_SB(sb)->s_journal = journal;
4617 ext4_clear_journal_err(sb, es);
4618
4619 if (!really_read_only && journal_devnum &&
4620 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
4621 es->s_journal_dev = cpu_to_le32(journal_devnum);
4622
4623 /* Make sure we flush the recovery flag to disk. */
4624 ext4_commit_super(sb, 1);
4625 }
4626
4627 return 0;
4628 }
4629
4630 static int ext4_commit_super(struct super_block *sb, int sync)
4631 {
4632 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
4633 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
4634 int error = 0;
4635
4636 if (!sbh || block_device_ejected(sb))
4637 return error;
4638 if (buffer_write_io_error(sbh)) {
4639 /*
4640 * Oh, dear. A previous attempt to write the
4641 * superblock failed. This could happen because the
4642 * USB device was yanked out. Or it could happen to
4643 * be a transient write error and maybe the block will
4644 * be remapped. Nothing we can do but to retry the
4645 * write and hope for the best.
4646 */
4647 ext4_msg(sb, KERN_ERR, "previous I/O error to "
4648 "superblock detected");
4649 clear_buffer_write_io_error(sbh);
4650 set_buffer_uptodate(sbh);
4651 }
4652 /*
4653 * If the file system is mounted read-only, don't update the
4654 * superblock write time. This avoids updating the superblock
4655 * write time when we are mounting the root file system
4656 * read/only but we need to replay the journal; at that point,
4657 * for people who are east of GMT and who make their clock
4658 * tick in localtime for Windows bug-for-bug compatibility,
4659 * the clock is set in the future, and this will cause e2fsck
4660 * to complain and force a full file system check.
4661 */
4662 if (!(sb->s_flags & MS_RDONLY))
4663 es->s_wtime = cpu_to_le32(get_seconds());
4664 if (sb->s_bdev->bd_part)
4665 es->s_kbytes_written =
4666 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written +
4667 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
4668 EXT4_SB(sb)->s_sectors_written_start) >> 1));
4669 else
4670 es->s_kbytes_written =
4671 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written);
4672 if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeclusters_counter))
4673 ext4_free_blocks_count_set(es,
4674 EXT4_C2B(EXT4_SB(sb), percpu_counter_sum_positive(
4675 &EXT4_SB(sb)->s_freeclusters_counter)));
4676 if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeinodes_counter))
4677 es->s_free_inodes_count =
4678 cpu_to_le32(percpu_counter_sum_positive(
4679 &EXT4_SB(sb)->s_freeinodes_counter));
4680 BUFFER_TRACE(sbh, "marking dirty");
4681 ext4_superblock_csum_set(sb);
4682 mark_buffer_dirty(sbh);
4683 if (sync) {
4684 error = __sync_dirty_buffer(sbh,
4685 test_opt(sb, BARRIER) ? WRITE_FUA : WRITE_SYNC);
4686 if (error)
4687 return error;
4688
4689 error = buffer_write_io_error(sbh);
4690 if (error) {
4691 ext4_msg(sb, KERN_ERR, "I/O error while writing "
4692 "superblock");
4693 clear_buffer_write_io_error(sbh);
4694 set_buffer_uptodate(sbh);
4695 }
4696 }
4697 return error;
4698 }
4699
4700 /*
4701 * Have we just finished recovery? If so, and if we are mounting (or
4702 * remounting) the filesystem readonly, then we will end up with a
4703 * consistent fs on disk. Record that fact.
4704 */
4705 static void ext4_mark_recovery_complete(struct super_block *sb,
4706 struct ext4_super_block *es)
4707 {
4708 journal_t *journal = EXT4_SB(sb)->s_journal;
4709
4710 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
4711 BUG_ON(journal != NULL);
4712 return;
4713 }
4714 jbd2_journal_lock_updates(journal);
4715 if (jbd2_journal_flush(journal) < 0)
4716 goto out;
4717
4718 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
4719 sb->s_flags & MS_RDONLY) {
4720 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4721 ext4_commit_super(sb, 1);
4722 }
4723
4724 out:
4725 jbd2_journal_unlock_updates(journal);
4726 }
4727
4728 /*
4729 * If we are mounting (or read-write remounting) a filesystem whose journal
4730 * has recorded an error from a previous lifetime, move that error to the
4731 * main filesystem now.
4732 */
4733 static void ext4_clear_journal_err(struct super_block *sb,
4734 struct ext4_super_block *es)
4735 {
4736 journal_t *journal;
4737 int j_errno;
4738 const char *errstr;
4739
4740 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4741
4742 journal = EXT4_SB(sb)->s_journal;
4743
4744 /*
4745 * Now check for any error status which may have been recorded in the
4746 * journal by a prior ext4_error() or ext4_abort()
4747 */
4748
4749 j_errno = jbd2_journal_errno(journal);
4750 if (j_errno) {
4751 char nbuf[16];
4752
4753 errstr = ext4_decode_error(sb, j_errno, nbuf);
4754 ext4_warning(sb, "Filesystem error recorded "
4755 "from previous mount: %s", errstr);
4756 ext4_warning(sb, "Marking fs in need of filesystem check.");
4757
4758 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
4759 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
4760 ext4_commit_super(sb, 1);
4761
4762 jbd2_journal_clear_err(journal);
4763 jbd2_journal_update_sb_errno(journal);
4764 }
4765 }
4766
4767 /*
4768 * Force the running and committing transactions to commit,
4769 * and wait on the commit.
4770 */
4771 int ext4_force_commit(struct super_block *sb)
4772 {
4773 journal_t *journal;
4774
4775 if (sb->s_flags & MS_RDONLY)
4776 return 0;
4777
4778 journal = EXT4_SB(sb)->s_journal;
4779 return ext4_journal_force_commit(journal);
4780 }
4781
4782 static int ext4_sync_fs(struct super_block *sb, int wait)
4783 {
4784 int ret = 0;
4785 tid_t target;
4786 bool needs_barrier = false;
4787 struct ext4_sb_info *sbi = EXT4_SB(sb);
4788
4789 trace_ext4_sync_fs(sb, wait);
4790 flush_workqueue(sbi->rsv_conversion_wq);
4791 /*
4792 * Writeback quota in non-journalled quota case - journalled quota has
4793 * no dirty dquots
4794 */
4795 dquot_writeback_dquots(sb, -1);
4796 /*
4797 * Data writeback is possible w/o journal transaction, so barrier must
4798 * being sent at the end of the function. But we can skip it if
4799 * transaction_commit will do it for us.
4800 */
4801 if (sbi->s_journal) {
4802 target = jbd2_get_latest_transaction(sbi->s_journal);
4803 if (wait && sbi->s_journal->j_flags & JBD2_BARRIER &&
4804 !jbd2_trans_will_send_data_barrier(sbi->s_journal, target))
4805 needs_barrier = true;
4806
4807 if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
4808 if (wait)
4809 ret = jbd2_log_wait_commit(sbi->s_journal,
4810 target);
4811 }
4812 } else if (wait && test_opt(sb, BARRIER))
4813 needs_barrier = true;
4814 if (needs_barrier) {
4815 int err;
4816 err = blkdev_issue_flush(sb->s_bdev, GFP_KERNEL, NULL);
4817 if (!ret)
4818 ret = err;
4819 }
4820
4821 return ret;
4822 }
4823
4824 /*
4825 * LVM calls this function before a (read-only) snapshot is created. This
4826 * gives us a chance to flush the journal completely and mark the fs clean.
4827 *
4828 * Note that only this function cannot bring a filesystem to be in a clean
4829 * state independently. It relies on upper layer to stop all data & metadata
4830 * modifications.
4831 */
4832 static int ext4_freeze(struct super_block *sb)
4833 {
4834 int error = 0;
4835 journal_t *journal;
4836
4837 if (sb->s_flags & MS_RDONLY)
4838 return 0;
4839
4840 journal = EXT4_SB(sb)->s_journal;
4841
4842 if (journal) {
4843 /* Now we set up the journal barrier. */
4844 jbd2_journal_lock_updates(journal);
4845
4846 /*
4847 * Don't clear the needs_recovery flag if we failed to
4848 * flush the journal.
4849 */
4850 error = jbd2_journal_flush(journal);
4851 if (error < 0)
4852 goto out;
4853
4854 /* Journal blocked and flushed, clear needs_recovery flag. */
4855 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4856 }
4857
4858 error = ext4_commit_super(sb, 1);
4859 out:
4860 if (journal)
4861 /* we rely on upper layer to stop further updates */
4862 jbd2_journal_unlock_updates(journal);
4863 return error;
4864 }
4865
4866 /*
4867 * Called by LVM after the snapshot is done. We need to reset the RECOVER
4868 * flag here, even though the filesystem is not technically dirty yet.
4869 */
4870 static int ext4_unfreeze(struct super_block *sb)
4871 {
4872 if (sb->s_flags & MS_RDONLY)
4873 return 0;
4874
4875 if (EXT4_SB(sb)->s_journal) {
4876 /* Reset the needs_recovery flag before the fs is unlocked. */
4877 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4878 }
4879
4880 ext4_commit_super(sb, 1);
4881 return 0;
4882 }
4883
4884 /*
4885 * Structure to save mount options for ext4_remount's benefit
4886 */
4887 struct ext4_mount_options {
4888 unsigned long s_mount_opt;
4889 unsigned long s_mount_opt2;
4890 kuid_t s_resuid;
4891 kgid_t s_resgid;
4892 unsigned long s_commit_interval;
4893 u32 s_min_batch_time, s_max_batch_time;
4894 #ifdef CONFIG_QUOTA
4895 int s_jquota_fmt;
4896 char *s_qf_names[EXT4_MAXQUOTAS];
4897 #endif
4898 };
4899
4900 static int ext4_remount(struct super_block *sb, int *flags, char *data)
4901 {
4902 struct ext4_super_block *es;
4903 struct ext4_sb_info *sbi = EXT4_SB(sb);
4904 unsigned long old_sb_flags;
4905 struct ext4_mount_options old_opts;
4906 int enable_quota = 0;
4907 ext4_group_t g;
4908 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
4909 int err = 0;
4910 #ifdef CONFIG_QUOTA
4911 int i, j;
4912 #endif
4913 char *orig_data = kstrdup(data, GFP_KERNEL);
4914
4915 /* Store the original options */
4916 old_sb_flags = sb->s_flags;
4917 old_opts.s_mount_opt = sbi->s_mount_opt;
4918 old_opts.s_mount_opt2 = sbi->s_mount_opt2;
4919 old_opts.s_resuid = sbi->s_resuid;
4920 old_opts.s_resgid = sbi->s_resgid;
4921 old_opts.s_commit_interval = sbi->s_commit_interval;
4922 old_opts.s_min_batch_time = sbi->s_min_batch_time;
4923 old_opts.s_max_batch_time = sbi->s_max_batch_time;
4924 #ifdef CONFIG_QUOTA
4925 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
4926 for (i = 0; i < EXT4_MAXQUOTAS; i++)
4927 if (sbi->s_qf_names[i]) {
4928 old_opts.s_qf_names[i] = kstrdup(sbi->s_qf_names[i],
4929 GFP_KERNEL);
4930 if (!old_opts.s_qf_names[i]) {
4931 for (j = 0; j < i; j++)
4932 kfree(old_opts.s_qf_names[j]);
4933 kfree(orig_data);
4934 return -ENOMEM;
4935 }
4936 } else
4937 old_opts.s_qf_names[i] = NULL;
4938 #endif
4939 if (sbi->s_journal && sbi->s_journal->j_task->io_context)
4940 journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
4941
4942 if (!parse_options(data, sb, NULL, &journal_ioprio, 1)) {
4943 err = -EINVAL;
4944 goto restore_opts;
4945 }
4946
4947 if ((old_opts.s_mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) ^
4948 test_opt(sb, JOURNAL_CHECKSUM)) {
4949 ext4_msg(sb, KERN_ERR, "changing journal_checksum "
4950 "during remount not supported; ignoring");
4951 sbi->s_mount_opt ^= EXT4_MOUNT_JOURNAL_CHECKSUM;
4952 }
4953
4954 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
4955 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
4956 ext4_msg(sb, KERN_ERR, "can't mount with "
4957 "both data=journal and delalloc");
4958 err = -EINVAL;
4959 goto restore_opts;
4960 }
4961 if (test_opt(sb, DIOREAD_NOLOCK)) {
4962 ext4_msg(sb, KERN_ERR, "can't mount with "
4963 "both data=journal and dioread_nolock");
4964 err = -EINVAL;
4965 goto restore_opts;
4966 }
4967 if (test_opt(sb, DAX)) {
4968 ext4_msg(sb, KERN_ERR, "can't mount with "
4969 "both data=journal and dax");
4970 err = -EINVAL;
4971 goto restore_opts;
4972 }
4973 }
4974
4975 if ((sbi->s_mount_opt ^ old_opts.s_mount_opt) & EXT4_MOUNT_DAX) {
4976 ext4_msg(sb, KERN_WARNING, "warning: refusing change of "
4977 "dax flag with busy inodes while remounting");
4978 sbi->s_mount_opt ^= EXT4_MOUNT_DAX;
4979 }
4980
4981 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
4982 ext4_abort(sb, "Abort forced by user");
4983
4984 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
4985 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
4986
4987 es = sbi->s_es;
4988
4989 if (sbi->s_journal) {
4990 ext4_init_journal_params(sb, sbi->s_journal);
4991 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
4992 }
4993
4994 if (*flags & MS_LAZYTIME)
4995 sb->s_flags |= MS_LAZYTIME;
4996
4997 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
4998 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) {
4999 err = -EROFS;
5000 goto restore_opts;
5001 }
5002
5003 if (*flags & MS_RDONLY) {
5004 err = sync_filesystem(sb);
5005 if (err < 0)
5006 goto restore_opts;
5007 err = dquot_suspend(sb, -1);
5008 if (err < 0)
5009 goto restore_opts;
5010
5011 /*
5012 * First of all, the unconditional stuff we have to do
5013 * to disable replay of the journal when we next remount
5014 */
5015 sb->s_flags |= MS_RDONLY;
5016
5017 /*
5018 * OK, test if we are remounting a valid rw partition
5019 * readonly, and if so set the rdonly flag and then
5020 * mark the partition as valid again.
5021 */
5022 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
5023 (sbi->s_mount_state & EXT4_VALID_FS))
5024 es->s_state = cpu_to_le16(sbi->s_mount_state);
5025
5026 if (sbi->s_journal)
5027 ext4_mark_recovery_complete(sb, es);
5028 } else {
5029 /* Make sure we can mount this feature set readwrite */
5030 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
5031 EXT4_FEATURE_RO_COMPAT_READONLY) ||
5032 !ext4_feature_set_ok(sb, 0)) {
5033 err = -EROFS;
5034 goto restore_opts;
5035 }
5036 /*
5037 * Make sure the group descriptor checksums
5038 * are sane. If they aren't, refuse to remount r/w.
5039 */
5040 for (g = 0; g < sbi->s_groups_count; g++) {
5041 struct ext4_group_desc *gdp =
5042 ext4_get_group_desc(sb, g, NULL);
5043
5044 if (!ext4_group_desc_csum_verify(sb, g, gdp)) {
5045 ext4_msg(sb, KERN_ERR,
5046 "ext4_remount: Checksum for group %u failed (%u!=%u)",
5047 g, le16_to_cpu(ext4_group_desc_csum(sbi, g, gdp)),
5048 le16_to_cpu(gdp->bg_checksum));
5049 err = -EINVAL;
5050 goto restore_opts;
5051 }
5052 }
5053
5054 /*
5055 * If we have an unprocessed orphan list hanging
5056 * around from a previously readonly bdev mount,
5057 * require a full umount/remount for now.
5058 */
5059 if (es->s_last_orphan) {
5060 ext4_msg(sb, KERN_WARNING, "Couldn't "
5061 "remount RDWR because of unprocessed "
5062 "orphan inode list. Please "
5063 "umount/remount instead");
5064 err = -EINVAL;
5065 goto restore_opts;
5066 }
5067
5068 /*
5069 * Mounting a RDONLY partition read-write, so reread
5070 * and store the current valid flag. (It may have
5071 * been changed by e2fsck since we originally mounted
5072 * the partition.)
5073 */
5074 if (sbi->s_journal)
5075 ext4_clear_journal_err(sb, es);
5076 sbi->s_mount_state = le16_to_cpu(es->s_state);
5077 if (!ext4_setup_super(sb, es, 0))
5078 sb->s_flags &= ~MS_RDONLY;
5079 if (EXT4_HAS_INCOMPAT_FEATURE(sb,
5080 EXT4_FEATURE_INCOMPAT_MMP))
5081 if (ext4_multi_mount_protect(sb,
5082 le64_to_cpu(es->s_mmp_block))) {
5083 err = -EROFS;
5084 goto restore_opts;
5085 }
5086 enable_quota = 1;
5087 }
5088 }
5089
5090 /*
5091 * Reinitialize lazy itable initialization thread based on
5092 * current settings
5093 */
5094 if ((sb->s_flags & MS_RDONLY) || !test_opt(sb, INIT_INODE_TABLE))
5095 ext4_unregister_li_request(sb);
5096 else {
5097 ext4_group_t first_not_zeroed;
5098 first_not_zeroed = ext4_has_uninit_itable(sb);
5099 ext4_register_li_request(sb, first_not_zeroed);
5100 }
5101
5102 ext4_setup_system_zone(sb);
5103 if (sbi->s_journal == NULL && !(old_sb_flags & MS_RDONLY))
5104 ext4_commit_super(sb, 1);
5105
5106 #ifdef CONFIG_QUOTA
5107 /* Release old quota file names */
5108 for (i = 0; i < EXT4_MAXQUOTAS; i++)
5109 kfree(old_opts.s_qf_names[i]);
5110 if (enable_quota) {
5111 if (sb_any_quota_suspended(sb))
5112 dquot_resume(sb, -1);
5113 else if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
5114 EXT4_FEATURE_RO_COMPAT_QUOTA)) {
5115 err = ext4_enable_quotas(sb);
5116 if (err)
5117 goto restore_opts;
5118 }
5119 }
5120 #endif
5121
5122 *flags = (*flags & ~MS_LAZYTIME) | (sb->s_flags & MS_LAZYTIME);
5123 ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s", orig_data);
5124 kfree(orig_data);
5125 return 0;
5126
5127 restore_opts:
5128 sb->s_flags = old_sb_flags;
5129 sbi->s_mount_opt = old_opts.s_mount_opt;
5130 sbi->s_mount_opt2 = old_opts.s_mount_opt2;
5131 sbi->s_resuid = old_opts.s_resuid;
5132 sbi->s_resgid = old_opts.s_resgid;
5133 sbi->s_commit_interval = old_opts.s_commit_interval;
5134 sbi->s_min_batch_time = old_opts.s_min_batch_time;
5135 sbi->s_max_batch_time = old_opts.s_max_batch_time;
5136 #ifdef CONFIG_QUOTA
5137 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
5138 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
5139 kfree(sbi->s_qf_names[i]);
5140 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
5141 }
5142 #endif
5143 kfree(orig_data);
5144 return err;
5145 }
5146
5147 static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
5148 {
5149 struct super_block *sb = dentry->d_sb;
5150 struct ext4_sb_info *sbi = EXT4_SB(sb);
5151 struct ext4_super_block *es = sbi->s_es;
5152 ext4_fsblk_t overhead = 0, resv_blocks;
5153 u64 fsid;
5154 s64 bfree;
5155 resv_blocks = EXT4_C2B(sbi, atomic64_read(&sbi->s_resv_clusters));
5156
5157 if (!test_opt(sb, MINIX_DF))
5158 overhead = sbi->s_overhead;
5159
5160 buf->f_type = EXT4_SUPER_MAGIC;
5161 buf->f_bsize = sb->s_blocksize;
5162 buf->f_blocks = ext4_blocks_count(es) - EXT4_C2B(sbi, overhead);
5163 bfree = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) -
5164 percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter);
5165 /* prevent underflow in case that few free space is available */
5166 buf->f_bfree = EXT4_C2B(sbi, max_t(s64, bfree, 0));
5167 buf->f_bavail = buf->f_bfree -
5168 (ext4_r_blocks_count(es) + resv_blocks);
5169 if (buf->f_bfree < (ext4_r_blocks_count(es) + resv_blocks))
5170 buf->f_bavail = 0;
5171 buf->f_files = le32_to_cpu(es->s_inodes_count);
5172 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
5173 buf->f_namelen = EXT4_NAME_LEN;
5174 fsid = le64_to_cpup((void *)es->s_uuid) ^
5175 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
5176 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
5177 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
5178
5179 return 0;
5180 }
5181
5182 /* Helper function for writing quotas on sync - we need to start transaction
5183 * before quota file is locked for write. Otherwise the are possible deadlocks:
5184 * Process 1 Process 2
5185 * ext4_create() quota_sync()
5186 * jbd2_journal_start() write_dquot()
5187 * dquot_initialize() down(dqio_mutex)
5188 * down(dqio_mutex) jbd2_journal_start()
5189 *
5190 */
5191
5192 #ifdef CONFIG_QUOTA
5193
5194 static inline struct inode *dquot_to_inode(struct dquot *dquot)
5195 {
5196 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_id.type];
5197 }
5198
5199 static int ext4_write_dquot(struct dquot *dquot)
5200 {
5201 int ret, err;
5202 handle_t *handle;
5203 struct inode *inode;
5204
5205 inode = dquot_to_inode(dquot);
5206 handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
5207 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
5208 if (IS_ERR(handle))
5209 return PTR_ERR(handle);
5210 ret = dquot_commit(dquot);
5211 err = ext4_journal_stop(handle);
5212 if (!ret)
5213 ret = err;
5214 return ret;
5215 }
5216
5217 static int ext4_acquire_dquot(struct dquot *dquot)
5218 {
5219 int ret, err;
5220 handle_t *handle;
5221
5222 handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
5223 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
5224 if (IS_ERR(handle))
5225 return PTR_ERR(handle);
5226 ret = dquot_acquire(dquot);
5227 err = ext4_journal_stop(handle);
5228 if (!ret)
5229 ret = err;
5230 return ret;
5231 }
5232
5233 static int ext4_release_dquot(struct dquot *dquot)
5234 {
5235 int ret, err;
5236 handle_t *handle;
5237
5238 handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
5239 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
5240 if (IS_ERR(handle)) {
5241 /* Release dquot anyway to avoid endless cycle in dqput() */
5242 dquot_release(dquot);
5243 return PTR_ERR(handle);
5244 }
5245 ret = dquot_release(dquot);
5246 err = ext4_journal_stop(handle);
5247 if (!ret)
5248 ret = err;
5249 return ret;
5250 }
5251
5252 static int ext4_mark_dquot_dirty(struct dquot *dquot)
5253 {
5254 struct super_block *sb = dquot->dq_sb;
5255 struct ext4_sb_info *sbi = EXT4_SB(sb);
5256
5257 /* Are we journaling quotas? */
5258 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) ||
5259 sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
5260 dquot_mark_dquot_dirty(dquot);
5261 return ext4_write_dquot(dquot);
5262 } else {
5263 return dquot_mark_dquot_dirty(dquot);
5264 }
5265 }
5266
5267 static int ext4_write_info(struct super_block *sb, int type)
5268 {
5269 int ret, err;
5270 handle_t *handle;
5271
5272 /* Data block + inode block */
5273 handle = ext4_journal_start(d_inode(sb->s_root), EXT4_HT_QUOTA, 2);
5274 if (IS_ERR(handle))
5275 return PTR_ERR(handle);
5276 ret = dquot_commit_info(sb, type);
5277 err = ext4_journal_stop(handle);
5278 if (!ret)
5279 ret = err;
5280 return ret;
5281 }
5282
5283 /*
5284 * Turn on quotas during mount time - we need to find
5285 * the quota file and such...
5286 */
5287 static int ext4_quota_on_mount(struct super_block *sb, int type)
5288 {
5289 return dquot_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
5290 EXT4_SB(sb)->s_jquota_fmt, type);
5291 }
5292
5293 /*
5294 * Standard function to be called on quota_on
5295 */
5296 static int ext4_quota_on(struct super_block *sb, int type, int format_id,
5297 struct path *path)
5298 {
5299 int err;
5300
5301 if (!test_opt(sb, QUOTA))
5302 return -EINVAL;
5303
5304 /* Quotafile not on the same filesystem? */
5305 if (path->dentry->d_sb != sb)
5306 return -EXDEV;
5307 /* Journaling quota? */
5308 if (EXT4_SB(sb)->s_qf_names[type]) {
5309 /* Quotafile not in fs root? */
5310 if (path->dentry->d_parent != sb->s_root)
5311 ext4_msg(sb, KERN_WARNING,
5312 "Quota file not on filesystem root. "
5313 "Journaled quota will not work");
5314 }
5315
5316 /*
5317 * When we journal data on quota file, we have to flush journal to see
5318 * all updates to the file when we bypass pagecache...
5319 */
5320 if (EXT4_SB(sb)->s_journal &&
5321 ext4_should_journal_data(d_inode(path->dentry))) {
5322 /*
5323 * We don't need to lock updates but journal_flush() could
5324 * otherwise be livelocked...
5325 */
5326 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
5327 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
5328 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
5329 if (err)
5330 return err;
5331 }
5332
5333 return dquot_quota_on(sb, type, format_id, path);
5334 }
5335
5336 static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
5337 unsigned int flags)
5338 {
5339 int err;
5340 struct inode *qf_inode;
5341 unsigned long qf_inums[EXT4_MAXQUOTAS] = {
5342 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
5343 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum)
5344 };
5345
5346 BUG_ON(!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA));
5347
5348 if (!qf_inums[type])
5349 return -EPERM;
5350
5351 qf_inode = ext4_iget(sb, qf_inums[type]);
5352 if (IS_ERR(qf_inode)) {
5353 ext4_error(sb, "Bad quota inode # %lu", qf_inums[type]);
5354 return PTR_ERR(qf_inode);
5355 }
5356
5357 /* Don't account quota for quota files to avoid recursion */
5358 qf_inode->i_flags |= S_NOQUOTA;
5359 err = dquot_enable(qf_inode, type, format_id, flags);
5360 iput(qf_inode);
5361
5362 return err;
5363 }
5364
5365 /* Enable usage tracking for all quota types. */
5366 static int ext4_enable_quotas(struct super_block *sb)
5367 {
5368 int type, err = 0;
5369 unsigned long qf_inums[EXT4_MAXQUOTAS] = {
5370 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
5371 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum)
5372 };
5373
5374 sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE;
5375 for (type = 0; type < EXT4_MAXQUOTAS; type++) {
5376 if (qf_inums[type]) {
5377 err = ext4_quota_enable(sb, type, QFMT_VFS_V1,
5378 DQUOT_USAGE_ENABLED);
5379 if (err) {
5380 ext4_warning(sb,
5381 "Failed to enable quota tracking "
5382 "(type=%d, err=%d). Please run "
5383 "e2fsck to fix.", type, err);
5384 return err;
5385 }
5386 }
5387 }
5388 return 0;
5389 }
5390
5391 static int ext4_quota_off(struct super_block *sb, int type)
5392 {
5393 struct inode *inode = sb_dqopt(sb)->files[type];
5394 handle_t *handle;
5395
5396 /* Force all delayed allocation blocks to be allocated.
5397 * Caller already holds s_umount sem */
5398 if (test_opt(sb, DELALLOC))
5399 sync_filesystem(sb);
5400
5401 if (!inode)
5402 goto out;
5403
5404 /* Update modification times of quota files when userspace can
5405 * start looking at them */
5406 handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1);
5407 if (IS_ERR(handle))
5408 goto out;
5409 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
5410 ext4_mark_inode_dirty(handle, inode);
5411 ext4_journal_stop(handle);
5412
5413 out:
5414 return dquot_quota_off(sb, type);
5415 }
5416
5417 /* Read data from quotafile - avoid pagecache and such because we cannot afford
5418 * acquiring the locks... As quota files are never truncated and quota code
5419 * itself serializes the operations (and no one else should touch the files)
5420 * we don't have to be afraid of races */
5421 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
5422 size_t len, loff_t off)
5423 {
5424 struct inode *inode = sb_dqopt(sb)->files[type];
5425 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
5426 int offset = off & (sb->s_blocksize - 1);
5427 int tocopy;
5428 size_t toread;
5429 struct buffer_head *bh;
5430 loff_t i_size = i_size_read(inode);
5431
5432 if (off > i_size)
5433 return 0;
5434 if (off+len > i_size)
5435 len = i_size-off;
5436 toread = len;
5437 while (toread > 0) {
5438 tocopy = sb->s_blocksize - offset < toread ?
5439 sb->s_blocksize - offset : toread;
5440 bh = ext4_bread(NULL, inode, blk, 0);
5441 if (IS_ERR(bh))
5442 return PTR_ERR(bh);
5443 if (!bh) /* A hole? */
5444 memset(data, 0, tocopy);
5445 else
5446 memcpy(data, bh->b_data+offset, tocopy);
5447 brelse(bh);
5448 offset = 0;
5449 toread -= tocopy;
5450 data += tocopy;
5451 blk++;
5452 }
5453 return len;
5454 }
5455
5456 /* Write to quotafile (we know the transaction is already started and has
5457 * enough credits) */
5458 static ssize_t ext4_quota_write(struct super_block *sb, int type,
5459 const char *data, size_t len, loff_t off)
5460 {
5461 struct inode *inode = sb_dqopt(sb)->files[type];
5462 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
5463 int err, offset = off & (sb->s_blocksize - 1);
5464 int retries = 0;
5465 struct buffer_head *bh;
5466 handle_t *handle = journal_current_handle();
5467
5468 if (EXT4_SB(sb)->s_journal && !handle) {
5469 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
5470 " cancelled because transaction is not started",
5471 (unsigned long long)off, (unsigned long long)len);
5472 return -EIO;
5473 }
5474 /*
5475 * Since we account only one data block in transaction credits,
5476 * then it is impossible to cross a block boundary.
5477 */
5478 if (sb->s_blocksize - offset < len) {
5479 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
5480 " cancelled because not block aligned",
5481 (unsigned long long)off, (unsigned long long)len);
5482 return -EIO;
5483 }
5484
5485 do {
5486 bh = ext4_bread(handle, inode, blk,
5487 EXT4_GET_BLOCKS_CREATE |
5488 EXT4_GET_BLOCKS_METADATA_NOFAIL);
5489 } while (IS_ERR(bh) && (PTR_ERR(bh) == -ENOSPC) &&
5490 ext4_should_retry_alloc(inode->i_sb, &retries));
5491 if (IS_ERR(bh))
5492 return PTR_ERR(bh);
5493 if (!bh)
5494 goto out;
5495 BUFFER_TRACE(bh, "get write access");
5496 err = ext4_journal_get_write_access(handle, bh);
5497 if (err) {
5498 brelse(bh);
5499 return err;
5500 }
5501 lock_buffer(bh);
5502 memcpy(bh->b_data+offset, data, len);
5503 flush_dcache_page(bh->b_page);
5504 unlock_buffer(bh);
5505 err = ext4_handle_dirty_metadata(handle, NULL, bh);
5506 brelse(bh);
5507 out:
5508 if (inode->i_size < off + len) {
5509 i_size_write(inode, off + len);
5510 EXT4_I(inode)->i_disksize = inode->i_size;
5511 ext4_mark_inode_dirty(handle, inode);
5512 }
5513 return len;
5514 }
5515
5516 #endif
5517
5518 static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
5519 const char *dev_name, void *data)
5520 {
5521 return mount_bdev(fs_type, flags, dev_name, data, ext4_fill_super);
5522 }
5523
5524 #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2)
5525 static inline void register_as_ext2(void)
5526 {
5527 int err = register_filesystem(&ext2_fs_type);
5528 if (err)
5529 printk(KERN_WARNING
5530 "EXT4-fs: Unable to register as ext2 (%d)\n", err);
5531 }
5532
5533 static inline void unregister_as_ext2(void)
5534 {
5535 unregister_filesystem(&ext2_fs_type);
5536 }
5537
5538 static inline int ext2_feature_set_ok(struct super_block *sb)
5539 {
5540 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP))
5541 return 0;
5542 if (sb->s_flags & MS_RDONLY)
5543 return 1;
5544 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))
5545 return 0;
5546 return 1;
5547 }
5548 #else
5549 static inline void register_as_ext2(void) { }
5550 static inline void unregister_as_ext2(void) { }
5551 static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; }
5552 #endif
5553
5554 static inline void register_as_ext3(void)
5555 {
5556 int err = register_filesystem(&ext3_fs_type);
5557 if (err)
5558 printk(KERN_WARNING
5559 "EXT4-fs: Unable to register as ext3 (%d)\n", err);
5560 }
5561
5562 static inline void unregister_as_ext3(void)
5563 {
5564 unregister_filesystem(&ext3_fs_type);
5565 }
5566
5567 static inline int ext3_feature_set_ok(struct super_block *sb)
5568 {
5569 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP))
5570 return 0;
5571 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
5572 return 0;
5573 if (sb->s_flags & MS_RDONLY)
5574 return 1;
5575 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP))
5576 return 0;
5577 return 1;
5578 }
5579
5580 static struct file_system_type ext4_fs_type = {
5581 .owner = THIS_MODULE,
5582 .name = "ext4",
5583 .mount = ext4_mount,
5584 .kill_sb = kill_block_super,
5585 .fs_flags = FS_REQUIRES_DEV,
5586 };
5587 MODULE_ALIAS_FS("ext4");
5588
5589 static int __init ext4_init_feat_adverts(void)
5590 {
5591 struct ext4_features *ef;
5592 int ret = -ENOMEM;
5593
5594 ef = kzalloc(sizeof(struct ext4_features), GFP_KERNEL);
5595 if (!ef)
5596 goto out;
5597
5598 ef->f_kobj.kset = ext4_kset;
5599 init_completion(&ef->f_kobj_unregister);
5600 ret = kobject_init_and_add(&ef->f_kobj, &ext4_feat_ktype, NULL,
5601 "features");
5602 if (ret) {
5603 kfree(ef);
5604 goto out;
5605 }
5606
5607 ext4_feat = ef;
5608 ret = 0;
5609 out:
5610 return ret;
5611 }
5612
5613 static void ext4_exit_feat_adverts(void)
5614 {
5615 kobject_put(&ext4_feat->f_kobj);
5616 wait_for_completion(&ext4_feat->f_kobj_unregister);
5617 kfree(ext4_feat);
5618 }
5619
5620 /* Shared across all ext4 file systems */
5621 wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
5622 struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ];
5623
5624 static int __init ext4_init_fs(void)
5625 {
5626 int i, err;
5627
5628 ratelimit_state_init(&ext4_mount_msg_ratelimit, 30 * HZ, 64);
5629 ext4_li_info = NULL;
5630 mutex_init(&ext4_li_mtx);
5631
5632 /* Build-time check for flags consistency */
5633 ext4_check_flag_values();
5634
5635 for (i = 0; i < EXT4_WQ_HASH_SZ; i++) {
5636 mutex_init(&ext4__aio_mutex[i]);
5637 init_waitqueue_head(&ext4__ioend_wq[i]);
5638 }
5639
5640 err = ext4_init_es();
5641 if (err)
5642 return err;
5643
5644 err = ext4_init_pageio();
5645 if (err)
5646 goto out7;
5647
5648 err = ext4_init_system_zone();
5649 if (err)
5650 goto out6;
5651 ext4_kset = kset_create_and_add("ext4", NULL, fs_kobj);
5652 if (!ext4_kset) {
5653 err = -ENOMEM;
5654 goto out5;
5655 }
5656 ext4_proc_root = proc_mkdir("fs/ext4", NULL);
5657
5658 err = ext4_init_feat_adverts();
5659 if (err)
5660 goto out4;
5661
5662 err = ext4_init_mballoc();
5663 if (err)
5664 goto out2;
5665 else
5666 ext4_mballoc_ready = 1;
5667 err = init_inodecache();
5668 if (err)
5669 goto out1;
5670 register_as_ext3();
5671 register_as_ext2();
5672 err = register_filesystem(&ext4_fs_type);
5673 if (err)
5674 goto out;
5675
5676 return 0;
5677 out:
5678 unregister_as_ext2();
5679 unregister_as_ext3();
5680 destroy_inodecache();
5681 out1:
5682 ext4_mballoc_ready = 0;
5683 ext4_exit_mballoc();
5684 out2:
5685 ext4_exit_feat_adverts();
5686 out4:
5687 if (ext4_proc_root)
5688 remove_proc_entry("fs/ext4", NULL);
5689 kset_unregister(ext4_kset);
5690 out5:
5691 ext4_exit_system_zone();
5692 out6:
5693 ext4_exit_pageio();
5694 out7:
5695 ext4_exit_es();
5696
5697 return err;
5698 }
5699
5700 static void __exit ext4_exit_fs(void)
5701 {
5702 ext4_exit_crypto();
5703 ext4_destroy_lazyinit_thread();
5704 unregister_as_ext2();
5705 unregister_as_ext3();
5706 unregister_filesystem(&ext4_fs_type);
5707 destroy_inodecache();
5708 ext4_exit_mballoc();
5709 ext4_exit_feat_adverts();
5710 remove_proc_entry("fs/ext4", NULL);
5711 kset_unregister(ext4_kset);
5712 ext4_exit_system_zone();
5713 ext4_exit_pageio();
5714 ext4_exit_es();
5715 }
5716
5717 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
5718 MODULE_DESCRIPTION("Fourth Extended Filesystem");
5719 MODULE_LICENSE("GPL");
5720 module_init(ext4_init_fs)
5721 module_exit(ext4_exit_fs)
Linux with added FPC-III support