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[GitHub/mt8127/android_kernel_alcatel_ttab.git] / fs / ext4 / super.c
1 /*
2 * linux/fs/ext4/super.c
3 *
4 * Copyright (C) 1992, 1993, 1994, 1995
5 * Remy Card (card@masi.ibp.fr)
6 * Laboratoire MASI - Institut Blaise Pascal
7 * Universite Pierre et Marie Curie (Paris VI)
8 *
9 * from
10 *
11 * linux/fs/minix/inode.c
12 *
13 * Copyright (C) 1991, 1992 Linus Torvalds
14 *
15 * Big-endian to little-endian byte-swapping/bitmaps by
16 * David S. Miller (davem@caip.rutgers.edu), 1995
17 */
18
19 #include <linux/module.h>
20 #include <linux/string.h>
21 #include <linux/fs.h>
22 #include <linux/time.h>
23 #include <linux/vmalloc.h>
24 #include <linux/jbd2.h>
25 #include <linux/slab.h>
26 #include <linux/init.h>
27 #include <linux/blkdev.h>
28 #include <linux/parser.h>
29 #include <linux/buffer_head.h>
30 #include <linux/exportfs.h>
31 #include <linux/vfs.h>
32 #include <linux/random.h>
33 #include <linux/mount.h>
34 #include <linux/namei.h>
35 #include <linux/quotaops.h>
36 #include <linux/seq_file.h>
37 #include <linux/proc_fs.h>
38 #include <linux/ctype.h>
39 #include <linux/log2.h>
40 #include <linux/crc16.h>
41 #include <linux/cleancache.h>
42 #include <asm/uaccess.h>
43
44 #include <linux/kthread.h>
45 #include <linux/freezer.h>
46
47 #include "ext4.h"
48 #include "ext4_extents.h" /* Needed for trace points definition */
49 #include "ext4_jbd2.h"
50 #include "xattr.h"
51 #include "acl.h"
52 #include "mballoc.h"
53
54 #define CREATE_TRACE_POINTS
55 #include <trace/events/ext4.h>
56
57 static struct proc_dir_entry *ext4_proc_root;
58 static struct kset *ext4_kset;
59 static struct ext4_lazy_init *ext4_li_info;
60 static struct mutex ext4_li_mtx;
61 static struct ext4_features *ext4_feat;
62
63 static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
64 unsigned long journal_devnum);
65 static int ext4_show_options(struct seq_file *seq, struct dentry *root);
66 static int ext4_commit_super(struct super_block *sb, int sync);
67 static void ext4_mark_recovery_complete(struct super_block *sb,
68 struct ext4_super_block *es);
69 static void ext4_clear_journal_err(struct super_block *sb,
70 struct ext4_super_block *es);
71 static int ext4_sync_fs(struct super_block *sb, int wait);
72 static int ext4_remount(struct super_block *sb, int *flags, char *data);
73 static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
74 static int ext4_unfreeze(struct super_block *sb);
75 static int ext4_freeze(struct super_block *sb);
76 static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
77 const char *dev_name, void *data);
78 static inline int ext2_feature_set_ok(struct super_block *sb);
79 static inline int ext3_feature_set_ok(struct super_block *sb);
80 static int ext4_feature_set_ok(struct super_block *sb, int readonly);
81 static void ext4_destroy_lazyinit_thread(void);
82 static void ext4_unregister_li_request(struct super_block *sb);
83 static void ext4_clear_request_list(void);
84 static int ext4_reserve_clusters(struct ext4_sb_info *, ext4_fsblk_t);
85
86 #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
87 static struct file_system_type ext2_fs_type = {
88 .owner = THIS_MODULE,
89 .name = "ext2",
90 .mount = ext4_mount,
91 .kill_sb = kill_block_super,
92 .fs_flags = FS_REQUIRES_DEV,
93 };
94 MODULE_ALIAS_FS("ext2");
95 MODULE_ALIAS("ext2");
96 #define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type)
97 #else
98 #define IS_EXT2_SB(sb) (0)
99 #endif
100
101
102 #if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
103 static struct file_system_type ext3_fs_type = {
104 .owner = THIS_MODULE,
105 .name = "ext3",
106 .mount = ext4_mount,
107 .kill_sb = kill_block_super,
108 .fs_flags = FS_REQUIRES_DEV,
109 };
110 MODULE_ALIAS_FS("ext3");
111 MODULE_ALIAS("ext3");
112 #define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type)
113 #else
114 #define IS_EXT3_SB(sb) (0)
115 #endif
116
117 static int ext4_verify_csum_type(struct super_block *sb,
118 struct ext4_super_block *es)
119 {
120 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
121 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
122 return 1;
123
124 return es->s_checksum_type == EXT4_CRC32C_CHKSUM;
125 }
126
127 static __le32 ext4_superblock_csum(struct super_block *sb,
128 struct ext4_super_block *es)
129 {
130 struct ext4_sb_info *sbi = EXT4_SB(sb);
131 int offset = offsetof(struct ext4_super_block, s_checksum);
132 __u32 csum;
133
134 csum = ext4_chksum(sbi, ~0, (char *)es, offset);
135
136 return cpu_to_le32(csum);
137 }
138
139 int ext4_superblock_csum_verify(struct super_block *sb,
140 struct ext4_super_block *es)
141 {
142 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
143 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
144 return 1;
145
146 return es->s_checksum == ext4_superblock_csum(sb, es);
147 }
148
149 void ext4_superblock_csum_set(struct super_block *sb)
150 {
151 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
152
153 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
154 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
155 return;
156
157 es->s_checksum = ext4_superblock_csum(sb, es);
158 }
159
160 void *ext4_kvmalloc(size_t size, gfp_t flags)
161 {
162 void *ret;
163
164 ret = kmalloc(size, flags);
165 if (!ret)
166 ret = __vmalloc(size, flags, PAGE_KERNEL);
167 return ret;
168 }
169
170 void *ext4_kvzalloc(size_t size, gfp_t flags)
171 {
172 void *ret;
173
174 ret = kzalloc(size, flags);
175 if (!ret)
176 ret = __vmalloc(size, flags | __GFP_ZERO, PAGE_KERNEL);
177 return ret;
178 }
179
180 void ext4_kvfree(void *ptr)
181 {
182 if (is_vmalloc_addr(ptr))
183 vfree(ptr);
184 else
185 kfree(ptr);
186
187 }
188
189 ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
190 struct ext4_group_desc *bg)
191 {
192 return le32_to_cpu(bg->bg_block_bitmap_lo) |
193 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
194 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
195 }
196
197 ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
198 struct ext4_group_desc *bg)
199 {
200 return le32_to_cpu(bg->bg_inode_bitmap_lo) |
201 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
202 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
203 }
204
205 ext4_fsblk_t ext4_inode_table(struct super_block *sb,
206 struct ext4_group_desc *bg)
207 {
208 return le32_to_cpu(bg->bg_inode_table_lo) |
209 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
210 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
211 }
212
213 __u32 ext4_free_group_clusters(struct super_block *sb,
214 struct ext4_group_desc *bg)
215 {
216 return le16_to_cpu(bg->bg_free_blocks_count_lo) |
217 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
218 (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0);
219 }
220
221 __u32 ext4_free_inodes_count(struct super_block *sb,
222 struct ext4_group_desc *bg)
223 {
224 return le16_to_cpu(bg->bg_free_inodes_count_lo) |
225 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
226 (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0);
227 }
228
229 __u32 ext4_used_dirs_count(struct super_block *sb,
230 struct ext4_group_desc *bg)
231 {
232 return le16_to_cpu(bg->bg_used_dirs_count_lo) |
233 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
234 (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0);
235 }
236
237 __u32 ext4_itable_unused_count(struct super_block *sb,
238 struct ext4_group_desc *bg)
239 {
240 return le16_to_cpu(bg->bg_itable_unused_lo) |
241 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
242 (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0);
243 }
244
245 void ext4_block_bitmap_set(struct super_block *sb,
246 struct ext4_group_desc *bg, ext4_fsblk_t blk)
247 {
248 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
249 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
250 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
251 }
252
253 void ext4_inode_bitmap_set(struct super_block *sb,
254 struct ext4_group_desc *bg, ext4_fsblk_t blk)
255 {
256 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk);
257 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
258 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
259 }
260
261 void ext4_inode_table_set(struct super_block *sb,
262 struct ext4_group_desc *bg, ext4_fsblk_t blk)
263 {
264 bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
265 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
266 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
267 }
268
269 void ext4_free_group_clusters_set(struct super_block *sb,
270 struct ext4_group_desc *bg, __u32 count)
271 {
272 bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count);
273 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
274 bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16);
275 }
276
277 void ext4_free_inodes_set(struct super_block *sb,
278 struct ext4_group_desc *bg, __u32 count)
279 {
280 bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count);
281 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
282 bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16);
283 }
284
285 void ext4_used_dirs_set(struct super_block *sb,
286 struct ext4_group_desc *bg, __u32 count)
287 {
288 bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count);
289 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
290 bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16);
291 }
292
293 void ext4_itable_unused_set(struct super_block *sb,
294 struct ext4_group_desc *bg, __u32 count)
295 {
296 bg->bg_itable_unused_lo = cpu_to_le16((__u16)count);
297 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
298 bg->bg_itable_unused_hi = cpu_to_le16(count >> 16);
299 }
300
301
302 static void __save_error_info(struct super_block *sb, const char *func,
303 unsigned int line)
304 {
305 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
306
307 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
308 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
309 es->s_last_error_time = cpu_to_le32(get_seconds());
310 strncpy(es->s_last_error_func, func, sizeof(es->s_last_error_func));
311 es->s_last_error_line = cpu_to_le32(line);
312 if (!es->s_first_error_time) {
313 es->s_first_error_time = es->s_last_error_time;
314 strncpy(es->s_first_error_func, func,
315 sizeof(es->s_first_error_func));
316 es->s_first_error_line = cpu_to_le32(line);
317 es->s_first_error_ino = es->s_last_error_ino;
318 es->s_first_error_block = es->s_last_error_block;
319 }
320 /*
321 * Start the daily error reporting function if it hasn't been
322 * started already
323 */
324 if (!es->s_error_count)
325 mod_timer(&EXT4_SB(sb)->s_err_report, jiffies + 24*60*60*HZ);
326 le32_add_cpu(&es->s_error_count, 1);
327 }
328
329 static void save_error_info(struct super_block *sb, const char *func,
330 unsigned int line)
331 {
332 __save_error_info(sb, func, line);
333 ext4_commit_super(sb, 1);
334 }
335
336 /*
337 * The del_gendisk() function uninitializes the disk-specific data
338 * structures, including the bdi structure, without telling anyone
339 * else. Once this happens, any attempt to call mark_buffer_dirty()
340 * (for example, by ext4_commit_super), will cause a kernel OOPS.
341 * This is a kludge to prevent these oops until we can put in a proper
342 * hook in del_gendisk() to inform the VFS and file system layers.
343 */
344 static int block_device_ejected(struct super_block *sb)
345 {
346 struct inode *bd_inode = sb->s_bdev->bd_inode;
347 struct backing_dev_info *bdi = bd_inode->i_mapping->backing_dev_info;
348
349 return bdi->dev == NULL;
350 }
351
352 static void ext4_journal_commit_callback(journal_t *journal, transaction_t *txn)
353 {
354 struct super_block *sb = journal->j_private;
355 struct ext4_sb_info *sbi = EXT4_SB(sb);
356 int error = is_journal_aborted(journal);
357 struct ext4_journal_cb_entry *jce;
358
359 BUG_ON(txn->t_state == T_FINISHED);
360 spin_lock(&sbi->s_md_lock);
361 while (!list_empty(&txn->t_private_list)) {
362 jce = list_entry(txn->t_private_list.next,
363 struct ext4_journal_cb_entry, jce_list);
364 list_del_init(&jce->jce_list);
365 spin_unlock(&sbi->s_md_lock);
366 jce->jce_func(sb, jce, error);
367 spin_lock(&sbi->s_md_lock);
368 }
369 spin_unlock(&sbi->s_md_lock);
370 }
371
372 /* Deal with the reporting of failure conditions on a filesystem such as
373 * inconsistencies detected or read IO failures.
374 *
375 * On ext2, we can store the error state of the filesystem in the
376 * superblock. That is not possible on ext4, because we may have other
377 * write ordering constraints on the superblock which prevent us from
378 * writing it out straight away; and given that the journal is about to
379 * be aborted, we can't rely on the current, or future, transactions to
380 * write out the superblock safely.
381 *
382 * We'll just use the jbd2_journal_abort() error code to record an error in
383 * the journal instead. On recovery, the journal will complain about
384 * that error until we've noted it down and cleared it.
385 */
386
387 static void ext4_handle_error(struct super_block *sb)
388 {
389 if (sb->s_flags & MS_RDONLY)
390 return;
391
392 if (!test_opt(sb, ERRORS_CONT)) {
393 journal_t *journal = EXT4_SB(sb)->s_journal;
394
395 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
396 if (journal)
397 jbd2_journal_abort(journal, -EIO);
398 }
399 if (test_opt(sb, ERRORS_RO)) {
400 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
401 sb->s_flags |= MS_RDONLY;
402 }
403 if (test_opt(sb, ERRORS_PANIC)) {
404 if (EXT4_SB(sb)->s_journal &&
405 !(EXT4_SB(sb)->s_journal->j_flags & JBD2_REC_ERR))
406 return;
407 panic("EXT4-fs (device %s): panic forced after error\n",
408 sb->s_id);
409 }
410 }
411
412 void __ext4_error(struct super_block *sb, const char *function,
413 unsigned int line, const char *fmt, ...)
414 {
415 struct va_format vaf;
416 va_list args;
417
418 va_start(args, fmt);
419 vaf.fmt = fmt;
420 vaf.va = &args;
421 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n",
422 sb->s_id, function, line, current->comm, &vaf);
423 va_end(args);
424 save_error_info(sb, function, line);
425
426 ext4_handle_error(sb);
427 }
428
429 void ext4_error_inode(struct inode *inode, const char *function,
430 unsigned int line, ext4_fsblk_t block,
431 const char *fmt, ...)
432 {
433 va_list args;
434 struct va_format vaf;
435 struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
436
437 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
438 es->s_last_error_block = cpu_to_le64(block);
439 save_error_info(inode->i_sb, function, line);
440 va_start(args, fmt);
441 vaf.fmt = fmt;
442 vaf.va = &args;
443 if (block)
444 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
445 "inode #%lu: block %llu: comm %s: %pV\n",
446 inode->i_sb->s_id, function, line, inode->i_ino,
447 block, current->comm, &vaf);
448 else
449 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
450 "inode #%lu: comm %s: %pV\n",
451 inode->i_sb->s_id, function, line, inode->i_ino,
452 current->comm, &vaf);
453 va_end(args);
454
455 ext4_handle_error(inode->i_sb);
456 }
457
458 void ext4_error_file(struct file *file, const char *function,
459 unsigned int line, ext4_fsblk_t block,
460 const char *fmt, ...)
461 {
462 va_list args;
463 struct va_format vaf;
464 struct ext4_super_block *es;
465 struct inode *inode = file_inode(file);
466 char pathname[80], *path;
467
468 es = EXT4_SB(inode->i_sb)->s_es;
469 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
470 save_error_info(inode->i_sb, function, line);
471 path = d_path(&(file->f_path), pathname, sizeof(pathname));
472 if (IS_ERR(path))
473 path = "(unknown)";
474 va_start(args, fmt);
475 vaf.fmt = fmt;
476 vaf.va = &args;
477 if (block)
478 printk(KERN_CRIT
479 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
480 "block %llu: comm %s: path %s: %pV\n",
481 inode->i_sb->s_id, function, line, inode->i_ino,
482 block, current->comm, path, &vaf);
483 else
484 printk(KERN_CRIT
485 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
486 "comm %s: path %s: %pV\n",
487 inode->i_sb->s_id, function, line, inode->i_ino,
488 current->comm, path, &vaf);
489 va_end(args);
490
491 ext4_handle_error(inode->i_sb);
492 }
493
494 const char *ext4_decode_error(struct super_block *sb, int errno,
495 char nbuf[16])
496 {
497 char *errstr = NULL;
498
499 switch (errno) {
500 case -EIO:
501 errstr = "IO failure";
502 break;
503 case -ENOMEM:
504 errstr = "Out of memory";
505 break;
506 case -EROFS:
507 if (!sb || (EXT4_SB(sb)->s_journal &&
508 EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT))
509 errstr = "Journal has aborted";
510 else
511 errstr = "Readonly filesystem";
512 break;
513 default:
514 /* If the caller passed in an extra buffer for unknown
515 * errors, textualise them now. Else we just return
516 * NULL. */
517 if (nbuf) {
518 /* Check for truncated error codes... */
519 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
520 errstr = nbuf;
521 }
522 break;
523 }
524
525 return errstr;
526 }
527
528 /* __ext4_std_error decodes expected errors from journaling functions
529 * automatically and invokes the appropriate error response. */
530
531 void __ext4_std_error(struct super_block *sb, const char *function,
532 unsigned int line, int errno)
533 {
534 char nbuf[16];
535 const char *errstr;
536
537 /* Special case: if the error is EROFS, and we're not already
538 * inside a transaction, then there's really no point in logging
539 * an error. */
540 if (errno == -EROFS && journal_current_handle() == NULL &&
541 (sb->s_flags & MS_RDONLY))
542 return;
543
544 errstr = ext4_decode_error(sb, errno, nbuf);
545 printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n",
546 sb->s_id, function, line, errstr);
547 save_error_info(sb, function, line);
548
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 sb->s_flags |= MS_RDONLY;
578 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
579 if (EXT4_SB(sb)->s_journal)
580 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
581 save_error_info(sb, function, line);
582 }
583 if (test_opt(sb, ERRORS_PANIC)) {
584 if (EXT4_SB(sb)->s_journal &&
585 !(EXT4_SB(sb)->s_journal->j_flags & JBD2_REC_ERR))
586 return;
587 panic("EXT4-fs panic from previous error\n");
588 }
589 }
590
591 void ext4_msg(struct super_block *sb, const char *prefix, const char *fmt, ...)
592 {
593 struct va_format vaf;
594 va_list args;
595
596 va_start(args, fmt);
597 vaf.fmt = fmt;
598 vaf.va = &args;
599 printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
600 va_end(args);
601 }
602
603 void __ext4_warning(struct super_block *sb, const char *function,
604 unsigned int line, const char *fmt, ...)
605 {
606 struct va_format vaf;
607 va_list args;
608
609 va_start(args, fmt);
610 vaf.fmt = fmt;
611 vaf.va = &args;
612 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: %pV\n",
613 sb->s_id, function, line, &vaf);
614 va_end(args);
615 }
616
617 void __ext4_grp_locked_error(const char *function, unsigned int line,
618 struct super_block *sb, ext4_group_t grp,
619 unsigned long ino, ext4_fsblk_t block,
620 const char *fmt, ...)
621 __releases(bitlock)
622 __acquires(bitlock)
623 {
624 struct va_format vaf;
625 va_list args;
626 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
627
628 es->s_last_error_ino = cpu_to_le32(ino);
629 es->s_last_error_block = cpu_to_le64(block);
630 __save_error_info(sb, function, line);
631
632 va_start(args, fmt);
633
634 vaf.fmt = fmt;
635 vaf.va = &args;
636 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u, ",
637 sb->s_id, function, line, grp);
638 if (ino)
639 printk(KERN_CONT "inode %lu: ", ino);
640 if (block)
641 printk(KERN_CONT "block %llu:", (unsigned long long) block);
642 printk(KERN_CONT "%pV\n", &vaf);
643 va_end(args);
644
645 if (test_opt(sb, ERRORS_CONT)) {
646 ext4_commit_super(sb, 0);
647 return;
648 }
649
650 ext4_unlock_group(sb, grp);
651 ext4_handle_error(sb);
652 /*
653 * We only get here in the ERRORS_RO case; relocking the group
654 * may be dangerous, but nothing bad will happen since the
655 * filesystem will have already been marked read/only and the
656 * journal has been aborted. We return 1 as a hint to callers
657 * who might what to use the return value from
658 * ext4_grp_locked_error() to distinguish between the
659 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
660 * aggressively from the ext4 function in question, with a
661 * more appropriate error code.
662 */
663 ext4_lock_group(sb, grp);
664 return;
665 }
666
667 void ext4_update_dynamic_rev(struct super_block *sb)
668 {
669 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
670
671 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
672 return;
673
674 ext4_warning(sb,
675 "updating to rev %d because of new feature flag, "
676 "running e2fsck is recommended",
677 EXT4_DYNAMIC_REV);
678
679 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
680 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
681 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
682 /* leave es->s_feature_*compat flags alone */
683 /* es->s_uuid will be set by e2fsck if empty */
684
685 /*
686 * The rest of the superblock fields should be zero, and if not it
687 * means they are likely already in use, so leave them alone. We
688 * can leave it up to e2fsck to clean up any inconsistencies there.
689 */
690 }
691
692 /*
693 * Open the external journal device
694 */
695 static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb)
696 {
697 struct block_device *bdev;
698 char b[BDEVNAME_SIZE];
699
700 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
701 if (IS_ERR(bdev))
702 goto fail;
703 return bdev;
704
705 fail:
706 ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld",
707 __bdevname(dev, b), PTR_ERR(bdev));
708 return NULL;
709 }
710
711 /*
712 * Release the journal device
713 */
714 static void ext4_blkdev_put(struct block_device *bdev)
715 {
716 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
717 }
718
719 static void ext4_blkdev_remove(struct ext4_sb_info *sbi)
720 {
721 struct block_device *bdev;
722 bdev = sbi->journal_bdev;
723 if (bdev) {
724 ext4_blkdev_put(bdev);
725 sbi->journal_bdev = NULL;
726 }
727 }
728
729 static inline struct inode *orphan_list_entry(struct list_head *l)
730 {
731 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
732 }
733
734 static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
735 {
736 struct list_head *l;
737
738 ext4_msg(sb, KERN_ERR, "sb orphan head is %d",
739 le32_to_cpu(sbi->s_es->s_last_orphan));
740
741 printk(KERN_ERR "sb_info orphan list:\n");
742 list_for_each(l, &sbi->s_orphan) {
743 struct inode *inode = orphan_list_entry(l);
744 printk(KERN_ERR " "
745 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
746 inode->i_sb->s_id, inode->i_ino, inode,
747 inode->i_mode, inode->i_nlink,
748 NEXT_ORPHAN(inode));
749 }
750 }
751
752 static void ext4_put_super(struct super_block *sb)
753 {
754 struct ext4_sb_info *sbi = EXT4_SB(sb);
755 struct ext4_super_block *es = sbi->s_es;
756 int i, err;
757
758 ext4_unregister_li_request(sb);
759 dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
760
761 flush_workqueue(sbi->dio_unwritten_wq);
762 destroy_workqueue(sbi->dio_unwritten_wq);
763
764 if (sbi->s_journal) {
765 err = jbd2_journal_destroy(sbi->s_journal);
766 sbi->s_journal = NULL;
767 if (err < 0)
768 ext4_abort(sb, "Couldn't clean up the journal");
769 }
770
771 ext4_es_unregister_shrinker(sb);
772 del_timer(&sbi->s_err_report);
773 ext4_release_system_zone(sb);
774 ext4_mb_release(sb);
775 ext4_ext_release(sb);
776 ext4_xattr_put_super(sb);
777
778 if (!(sb->s_flags & MS_RDONLY)) {
779 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
780 es->s_state = cpu_to_le16(sbi->s_mount_state);
781 }
782 if (!(sb->s_flags & MS_RDONLY))
783 ext4_commit_super(sb, 1);
784
785 if (sbi->s_proc) {
786 remove_proc_entry("options", sbi->s_proc);
787 remove_proc_entry(sb->s_id, ext4_proc_root);
788 }
789 kobject_del(&sbi->s_kobj);
790
791 for (i = 0; i < sbi->s_gdb_count; i++)
792 brelse(sbi->s_group_desc[i]);
793 ext4_kvfree(sbi->s_group_desc);
794 ext4_kvfree(sbi->s_flex_groups);
795 percpu_counter_destroy(&sbi->s_freeclusters_counter);
796 percpu_counter_destroy(&sbi->s_freeinodes_counter);
797 percpu_counter_destroy(&sbi->s_dirs_counter);
798 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
799 percpu_counter_destroy(&sbi->s_extent_cache_cnt);
800 brelse(sbi->s_sbh);
801 #ifdef CONFIG_QUOTA
802 for (i = 0; i < MAXQUOTAS; i++)
803 kfree(sbi->s_qf_names[i]);
804 #endif
805
806 /* Debugging code just in case the in-memory inode orphan list
807 * isn't empty. The on-disk one can be non-empty if we've
808 * detected an error and taken the fs readonly, but the
809 * in-memory list had better be clean by this point. */
810 if (!list_empty(&sbi->s_orphan))
811 dump_orphan_list(sb, sbi);
812 J_ASSERT(list_empty(&sbi->s_orphan));
813
814 sync_blockdev(sb->s_bdev);
815 invalidate_bdev(sb->s_bdev);
816 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
817 /*
818 * Invalidate the journal device's buffers. We don't want them
819 * floating about in memory - the physical journal device may
820 * hotswapped, and it breaks the `ro-after' testing code.
821 */
822 sync_blockdev(sbi->journal_bdev);
823 invalidate_bdev(sbi->journal_bdev);
824 ext4_blkdev_remove(sbi);
825 }
826 if (sbi->s_mmp_tsk)
827 kthread_stop(sbi->s_mmp_tsk);
828 sb->s_fs_info = NULL;
829 /*
830 * Now that we are completely done shutting down the
831 * superblock, we need to actually destroy the kobject.
832 */
833 kobject_put(&sbi->s_kobj);
834 wait_for_completion(&sbi->s_kobj_unregister);
835 if (sbi->s_chksum_driver)
836 crypto_free_shash(sbi->s_chksum_driver);
837 kfree(sbi->s_blockgroup_lock);
838 kfree(sbi);
839 }
840
841 static struct kmem_cache *ext4_inode_cachep;
842
843 /*
844 * Called inside transaction, so use GFP_NOFS
845 */
846 static struct inode *ext4_alloc_inode(struct super_block *sb)
847 {
848 struct ext4_inode_info *ei;
849
850 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
851 if (!ei)
852 return NULL;
853
854 ei->vfs_inode.i_version = 1;
855 INIT_LIST_HEAD(&ei->i_prealloc_list);
856 spin_lock_init(&ei->i_prealloc_lock);
857 ext4_es_init_tree(&ei->i_es_tree);
858 rwlock_init(&ei->i_es_lock);
859 INIT_LIST_HEAD(&ei->i_es_lru);
860 ei->i_es_lru_nr = 0;
861 ei->i_reserved_data_blocks = 0;
862 ei->i_reserved_meta_blocks = 0;
863 ei->i_allocated_meta_blocks = 0;
864 ei->i_da_metadata_calc_len = 0;
865 ei->i_da_metadata_calc_last_lblock = 0;
866 spin_lock_init(&(ei->i_block_reservation_lock));
867 #ifdef CONFIG_QUOTA
868 ei->i_reserved_quota = 0;
869 #endif
870 ei->jinode = NULL;
871 INIT_LIST_HEAD(&ei->i_completed_io_list);
872 spin_lock_init(&ei->i_completed_io_lock);
873 ei->i_sync_tid = 0;
874 ei->i_datasync_tid = 0;
875 atomic_set(&ei->i_ioend_count, 0);
876 atomic_set(&ei->i_unwritten, 0);
877 INIT_WORK(&ei->i_unwritten_work, ext4_end_io_work);
878
879 return &ei->vfs_inode;
880 }
881
882 static int ext4_drop_inode(struct inode *inode)
883 {
884 int drop = generic_drop_inode(inode);
885
886 trace_ext4_drop_inode(inode, drop);
887 return drop;
888 }
889
890 static void ext4_i_callback(struct rcu_head *head)
891 {
892 struct inode *inode = container_of(head, struct inode, i_rcu);
893 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
894 }
895
896 static void ext4_destroy_inode(struct inode *inode)
897 {
898 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
899 ext4_msg(inode->i_sb, KERN_ERR,
900 "Inode %lu (%p): orphan list check failed!",
901 inode->i_ino, EXT4_I(inode));
902 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
903 EXT4_I(inode), sizeof(struct ext4_inode_info),
904 true);
905 dump_stack();
906 }
907 call_rcu(&inode->i_rcu, ext4_i_callback);
908 }
909
910 static void init_once(void *foo)
911 {
912 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
913
914 INIT_LIST_HEAD(&ei->i_orphan);
915 init_rwsem(&ei->xattr_sem);
916 init_rwsem(&ei->i_data_sem);
917 inode_init_once(&ei->vfs_inode);
918 }
919
920 static int init_inodecache(void)
921 {
922 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
923 sizeof(struct ext4_inode_info),
924 0, (SLAB_RECLAIM_ACCOUNT|
925 SLAB_MEM_SPREAD),
926 init_once);
927 if (ext4_inode_cachep == NULL)
928 return -ENOMEM;
929 return 0;
930 }
931
932 static void destroy_inodecache(void)
933 {
934 /*
935 * Make sure all delayed rcu free inodes are flushed before we
936 * destroy cache.
937 */
938 rcu_barrier();
939 kmem_cache_destroy(ext4_inode_cachep);
940 }
941
942 void ext4_clear_inode(struct inode *inode)
943 {
944 invalidate_inode_buffers(inode);
945 clear_inode(inode);
946 dquot_drop(inode);
947 ext4_discard_preallocations(inode);
948 ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS);
949 ext4_es_lru_del(inode);
950 if (EXT4_I(inode)->jinode) {
951 jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode),
952 EXT4_I(inode)->jinode);
953 jbd2_free_inode(EXT4_I(inode)->jinode);
954 EXT4_I(inode)->jinode = NULL;
955 }
956 }
957
958 static struct inode *ext4_nfs_get_inode(struct super_block *sb,
959 u64 ino, u32 generation)
960 {
961 struct inode *inode;
962
963 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
964 return ERR_PTR(-ESTALE);
965 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
966 return ERR_PTR(-ESTALE);
967
968 /* iget isn't really right if the inode is currently unallocated!!
969 *
970 * ext4_read_inode will return a bad_inode if the inode had been
971 * deleted, so we should be safe.
972 *
973 * Currently we don't know the generation for parent directory, so
974 * a generation of 0 means "accept any"
975 */
976 inode = ext4_iget_normal(sb, ino);
977 if (IS_ERR(inode))
978 return ERR_CAST(inode);
979 if (generation && inode->i_generation != generation) {
980 iput(inode);
981 return ERR_PTR(-ESTALE);
982 }
983
984 return inode;
985 }
986
987 static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
988 int fh_len, int fh_type)
989 {
990 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
991 ext4_nfs_get_inode);
992 }
993
994 static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
995 int fh_len, int fh_type)
996 {
997 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
998 ext4_nfs_get_inode);
999 }
1000
1001 /*
1002 * Try to release metadata pages (indirect blocks, directories) which are
1003 * mapped via the block device. Since these pages could have journal heads
1004 * which would prevent try_to_free_buffers() from freeing them, we must use
1005 * jbd2 layer's try_to_free_buffers() function to release them.
1006 */
1007 static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
1008 gfp_t wait)
1009 {
1010 journal_t *journal = EXT4_SB(sb)->s_journal;
1011
1012 WARN_ON(PageChecked(page));
1013 if (!page_has_buffers(page))
1014 return 0;
1015 if (journal)
1016 return jbd2_journal_try_to_free_buffers(journal, page,
1017 wait & ~__GFP_WAIT);
1018 return try_to_free_buffers(page);
1019 }
1020
1021 #ifdef CONFIG_QUOTA
1022 #define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
1023 #define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
1024
1025 static int ext4_write_dquot(struct dquot *dquot);
1026 static int ext4_acquire_dquot(struct dquot *dquot);
1027 static int ext4_release_dquot(struct dquot *dquot);
1028 static int ext4_mark_dquot_dirty(struct dquot *dquot);
1029 static int ext4_write_info(struct super_block *sb, int type);
1030 static int ext4_quota_on(struct super_block *sb, int type, int format_id,
1031 struct path *path);
1032 static int ext4_quota_on_sysfile(struct super_block *sb, int type,
1033 int format_id);
1034 static int ext4_quota_off(struct super_block *sb, int type);
1035 static int ext4_quota_off_sysfile(struct super_block *sb, int type);
1036 static int ext4_quota_on_mount(struct super_block *sb, int type);
1037 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
1038 size_t len, loff_t off);
1039 static ssize_t ext4_quota_write(struct super_block *sb, int type,
1040 const char *data, size_t len, loff_t off);
1041 static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
1042 unsigned int flags);
1043 static int ext4_enable_quotas(struct super_block *sb);
1044
1045 static const struct dquot_operations ext4_quota_operations = {
1046 .get_reserved_space = ext4_get_reserved_space,
1047 .write_dquot = ext4_write_dquot,
1048 .acquire_dquot = ext4_acquire_dquot,
1049 .release_dquot = ext4_release_dquot,
1050 .mark_dirty = ext4_mark_dquot_dirty,
1051 .write_info = ext4_write_info,
1052 .alloc_dquot = dquot_alloc,
1053 .destroy_dquot = dquot_destroy,
1054 };
1055
1056 static const struct quotactl_ops ext4_qctl_operations = {
1057 .quota_on = ext4_quota_on,
1058 .quota_off = ext4_quota_off,
1059 .quota_sync = dquot_quota_sync,
1060 .get_info = dquot_get_dqinfo,
1061 .set_info = dquot_set_dqinfo,
1062 .get_dqblk = dquot_get_dqblk,
1063 .set_dqblk = dquot_set_dqblk
1064 };
1065
1066 static const struct quotactl_ops ext4_qctl_sysfile_operations = {
1067 .quota_on_meta = ext4_quota_on_sysfile,
1068 .quota_off = ext4_quota_off_sysfile,
1069 .quota_sync = dquot_quota_sync,
1070 .get_info = dquot_get_dqinfo,
1071 .set_info = dquot_set_dqinfo,
1072 .get_dqblk = dquot_get_dqblk,
1073 .set_dqblk = dquot_set_dqblk
1074 };
1075 #endif
1076
1077 static const struct super_operations ext4_sops = {
1078 .alloc_inode = ext4_alloc_inode,
1079 .destroy_inode = ext4_destroy_inode,
1080 .write_inode = ext4_write_inode,
1081 .dirty_inode = ext4_dirty_inode,
1082 .drop_inode = ext4_drop_inode,
1083 .evict_inode = ext4_evict_inode,
1084 .put_super = ext4_put_super,
1085 .sync_fs = ext4_sync_fs,
1086 .freeze_fs = ext4_freeze,
1087 .unfreeze_fs = ext4_unfreeze,
1088 .statfs = ext4_statfs,
1089 .remount_fs = ext4_remount,
1090 .show_options = ext4_show_options,
1091 #ifdef CONFIG_QUOTA
1092 .quota_read = ext4_quota_read,
1093 .quota_write = ext4_quota_write,
1094 #endif
1095 .bdev_try_to_free_page = bdev_try_to_free_page,
1096 };
1097
1098 static const struct super_operations ext4_nojournal_sops = {
1099 .alloc_inode = ext4_alloc_inode,
1100 .destroy_inode = ext4_destroy_inode,
1101 .write_inode = ext4_write_inode,
1102 .dirty_inode = ext4_dirty_inode,
1103 .drop_inode = ext4_drop_inode,
1104 .evict_inode = ext4_evict_inode,
1105 .put_super = ext4_put_super,
1106 .statfs = ext4_statfs,
1107 .remount_fs = ext4_remount,
1108 .show_options = ext4_show_options,
1109 #ifdef CONFIG_QUOTA
1110 .quota_read = ext4_quota_read,
1111 .quota_write = ext4_quota_write,
1112 #endif
1113 .bdev_try_to_free_page = bdev_try_to_free_page,
1114 };
1115
1116 static const struct export_operations ext4_export_ops = {
1117 .fh_to_dentry = ext4_fh_to_dentry,
1118 .fh_to_parent = ext4_fh_to_parent,
1119 .get_parent = ext4_get_parent,
1120 };
1121
1122 enum {
1123 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
1124 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
1125 Opt_nouid32, Opt_debug, Opt_removed,
1126 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
1127 Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload,
1128 Opt_commit, Opt_min_batch_time, Opt_max_batch_time,
1129 Opt_journal_dev, Opt_journal_checksum, Opt_journal_async_commit,
1130 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
1131 Opt_data_err_abort, Opt_data_err_ignore,
1132 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
1133 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
1134 Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err,
1135 Opt_usrquota, Opt_grpquota, Opt_i_version,
1136 Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_mblk_io_submit,
1137 Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity,
1138 Opt_inode_readahead_blks, Opt_journal_ioprio,
1139 Opt_dioread_nolock, Opt_dioread_lock,
1140 Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable,
1141 Opt_max_dir_size_kb,
1142 };
1143
1144 static const match_table_t tokens = {
1145 {Opt_bsd_df, "bsddf"},
1146 {Opt_minix_df, "minixdf"},
1147 {Opt_grpid, "grpid"},
1148 {Opt_grpid, "bsdgroups"},
1149 {Opt_nogrpid, "nogrpid"},
1150 {Opt_nogrpid, "sysvgroups"},
1151 {Opt_resgid, "resgid=%u"},
1152 {Opt_resuid, "resuid=%u"},
1153 {Opt_sb, "sb=%u"},
1154 {Opt_err_cont, "errors=continue"},
1155 {Opt_err_panic, "errors=panic"},
1156 {Opt_err_ro, "errors=remount-ro"},
1157 {Opt_nouid32, "nouid32"},
1158 {Opt_debug, "debug"},
1159 {Opt_removed, "oldalloc"},
1160 {Opt_removed, "orlov"},
1161 {Opt_user_xattr, "user_xattr"},
1162 {Opt_nouser_xattr, "nouser_xattr"},
1163 {Opt_acl, "acl"},
1164 {Opt_noacl, "noacl"},
1165 {Opt_noload, "norecovery"},
1166 {Opt_noload, "noload"},
1167 {Opt_removed, "nobh"},
1168 {Opt_removed, "bh"},
1169 {Opt_commit, "commit=%u"},
1170 {Opt_min_batch_time, "min_batch_time=%u"},
1171 {Opt_max_batch_time, "max_batch_time=%u"},
1172 {Opt_journal_dev, "journal_dev=%u"},
1173 {Opt_journal_checksum, "journal_checksum"},
1174 {Opt_journal_async_commit, "journal_async_commit"},
1175 {Opt_abort, "abort"},
1176 {Opt_data_journal, "data=journal"},
1177 {Opt_data_ordered, "data=ordered"},
1178 {Opt_data_writeback, "data=writeback"},
1179 {Opt_data_err_abort, "data_err=abort"},
1180 {Opt_data_err_ignore, "data_err=ignore"},
1181 {Opt_offusrjquota, "usrjquota="},
1182 {Opt_usrjquota, "usrjquota=%s"},
1183 {Opt_offgrpjquota, "grpjquota="},
1184 {Opt_grpjquota, "grpjquota=%s"},
1185 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
1186 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
1187 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
1188 {Opt_grpquota, "grpquota"},
1189 {Opt_noquota, "noquota"},
1190 {Opt_quota, "quota"},
1191 {Opt_usrquota, "usrquota"},
1192 {Opt_barrier, "barrier=%u"},
1193 {Opt_barrier, "barrier"},
1194 {Opt_nobarrier, "nobarrier"},
1195 {Opt_i_version, "i_version"},
1196 {Opt_stripe, "stripe=%u"},
1197 {Opt_delalloc, "delalloc"},
1198 {Opt_nodelalloc, "nodelalloc"},
1199 {Opt_removed, "mblk_io_submit"},
1200 {Opt_removed, "nomblk_io_submit"},
1201 {Opt_block_validity, "block_validity"},
1202 {Opt_noblock_validity, "noblock_validity"},
1203 {Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
1204 {Opt_journal_ioprio, "journal_ioprio=%u"},
1205 {Opt_auto_da_alloc, "auto_da_alloc=%u"},
1206 {Opt_auto_da_alloc, "auto_da_alloc"},
1207 {Opt_noauto_da_alloc, "noauto_da_alloc"},
1208 {Opt_dioread_nolock, "dioread_nolock"},
1209 {Opt_dioread_lock, "dioread_lock"},
1210 {Opt_discard, "discard"},
1211 {Opt_nodiscard, "nodiscard"},
1212 {Opt_init_itable, "init_itable=%u"},
1213 {Opt_init_itable, "init_itable"},
1214 {Opt_noinit_itable, "noinit_itable"},
1215 {Opt_max_dir_size_kb, "max_dir_size_kb=%u"},
1216 {Opt_removed, "check=none"}, /* mount option from ext2/3 */
1217 {Opt_removed, "nocheck"}, /* mount option from ext2/3 */
1218 {Opt_removed, "reservation"}, /* mount option from ext2/3 */
1219 {Opt_removed, "noreservation"}, /* mount option from ext2/3 */
1220 {Opt_removed, "journal=%u"}, /* mount option from ext2/3 */
1221 {Opt_err, NULL},
1222 };
1223
1224 static ext4_fsblk_t get_sb_block(void **data)
1225 {
1226 ext4_fsblk_t sb_block;
1227 char *options = (char *) *data;
1228
1229 if (!options || strncmp(options, "sb=", 3) != 0)
1230 return 1; /* Default location */
1231
1232 options += 3;
1233 /* TODO: use simple_strtoll with >32bit ext4 */
1234 sb_block = simple_strtoul(options, &options, 0);
1235 if (*options && *options != ',') {
1236 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
1237 (char *) *data);
1238 return 1;
1239 }
1240 if (*options == ',')
1241 options++;
1242 *data = (void *) options;
1243
1244 return sb_block;
1245 }
1246
1247 #define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
1248 static char deprecated_msg[] = "Mount option \"%s\" will be removed by %s\n"
1249 "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
1250
1251 #ifdef CONFIG_QUOTA
1252 static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
1253 {
1254 struct ext4_sb_info *sbi = EXT4_SB(sb);
1255 char *qname;
1256 int ret = -1;
1257
1258 if (sb_any_quota_loaded(sb) &&
1259 !sbi->s_qf_names[qtype]) {
1260 ext4_msg(sb, KERN_ERR,
1261 "Cannot change journaled "
1262 "quota options when quota turned on");
1263 return -1;
1264 }
1265 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA)) {
1266 ext4_msg(sb, KERN_ERR, "Cannot set journaled quota options "
1267 "when QUOTA feature is enabled");
1268 return -1;
1269 }
1270 qname = match_strdup(args);
1271 if (!qname) {
1272 ext4_msg(sb, KERN_ERR,
1273 "Not enough memory for storing quotafile name");
1274 return -1;
1275 }
1276 if (sbi->s_qf_names[qtype]) {
1277 if (strcmp(sbi->s_qf_names[qtype], qname) == 0)
1278 ret = 1;
1279 else
1280 ext4_msg(sb, KERN_ERR,
1281 "%s quota file already specified",
1282 QTYPE2NAME(qtype));
1283 goto errout;
1284 }
1285 if (strchr(qname, '/')) {
1286 ext4_msg(sb, KERN_ERR,
1287 "quotafile must be on filesystem root");
1288 goto errout;
1289 }
1290 sbi->s_qf_names[qtype] = qname;
1291 set_opt(sb, QUOTA);
1292 return 1;
1293 errout:
1294 kfree(qname);
1295 return ret;
1296 }
1297
1298 static int clear_qf_name(struct super_block *sb, int qtype)
1299 {
1300
1301 struct ext4_sb_info *sbi = EXT4_SB(sb);
1302
1303 if (sb_any_quota_loaded(sb) &&
1304 sbi->s_qf_names[qtype]) {
1305 ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options"
1306 " when quota turned on");
1307 return -1;
1308 }
1309 kfree(sbi->s_qf_names[qtype]);
1310 sbi->s_qf_names[qtype] = NULL;
1311 return 1;
1312 }
1313 #endif
1314
1315 #define MOPT_SET 0x0001
1316 #define MOPT_CLEAR 0x0002
1317 #define MOPT_NOSUPPORT 0x0004
1318 #define MOPT_EXPLICIT 0x0008
1319 #define MOPT_CLEAR_ERR 0x0010
1320 #define MOPT_GTE0 0x0020
1321 #ifdef CONFIG_QUOTA
1322 #define MOPT_Q 0
1323 #define MOPT_QFMT 0x0040
1324 #else
1325 #define MOPT_Q MOPT_NOSUPPORT
1326 #define MOPT_QFMT MOPT_NOSUPPORT
1327 #endif
1328 #define MOPT_DATAJ 0x0080
1329 #define MOPT_NO_EXT2 0x0100
1330 #define MOPT_NO_EXT3 0x0200
1331 #define MOPT_EXT4_ONLY (MOPT_NO_EXT2 | MOPT_NO_EXT3)
1332
1333 static const struct mount_opts {
1334 int token;
1335 int mount_opt;
1336 int flags;
1337 } ext4_mount_opts[] = {
1338 {Opt_minix_df, EXT4_MOUNT_MINIX_DF, MOPT_SET},
1339 {Opt_bsd_df, EXT4_MOUNT_MINIX_DF, MOPT_CLEAR},
1340 {Opt_grpid, EXT4_MOUNT_GRPID, MOPT_SET},
1341 {Opt_nogrpid, EXT4_MOUNT_GRPID, MOPT_CLEAR},
1342 {Opt_block_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_SET},
1343 {Opt_noblock_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_CLEAR},
1344 {Opt_dioread_nolock, EXT4_MOUNT_DIOREAD_NOLOCK,
1345 MOPT_EXT4_ONLY | MOPT_SET},
1346 {Opt_dioread_lock, EXT4_MOUNT_DIOREAD_NOLOCK,
1347 MOPT_EXT4_ONLY | MOPT_CLEAR},
1348 {Opt_discard, EXT4_MOUNT_DISCARD, MOPT_SET},
1349 {Opt_nodiscard, EXT4_MOUNT_DISCARD, MOPT_CLEAR},
1350 {Opt_delalloc, EXT4_MOUNT_DELALLOC,
1351 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
1352 {Opt_nodelalloc, EXT4_MOUNT_DELALLOC,
1353 MOPT_EXT4_ONLY | MOPT_CLEAR},
1354 {Opt_journal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
1355 MOPT_EXT4_ONLY | MOPT_SET},
1356 {Opt_journal_async_commit, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT |
1357 EXT4_MOUNT_JOURNAL_CHECKSUM),
1358 MOPT_EXT4_ONLY | MOPT_SET},
1359 {Opt_noload, EXT4_MOUNT_NOLOAD, MOPT_NO_EXT2 | MOPT_SET},
1360 {Opt_err_panic, EXT4_MOUNT_ERRORS_PANIC, MOPT_SET | MOPT_CLEAR_ERR},
1361 {Opt_err_ro, EXT4_MOUNT_ERRORS_RO, MOPT_SET | MOPT_CLEAR_ERR},
1362 {Opt_err_cont, EXT4_MOUNT_ERRORS_CONT, MOPT_SET | MOPT_CLEAR_ERR},
1363 {Opt_data_err_abort, EXT4_MOUNT_DATA_ERR_ABORT,
1364 MOPT_NO_EXT2 | MOPT_SET},
1365 {Opt_data_err_ignore, EXT4_MOUNT_DATA_ERR_ABORT,
1366 MOPT_NO_EXT2 | MOPT_CLEAR},
1367 {Opt_barrier, EXT4_MOUNT_BARRIER, MOPT_SET},
1368 {Opt_nobarrier, EXT4_MOUNT_BARRIER, MOPT_CLEAR},
1369 {Opt_noauto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_SET},
1370 {Opt_auto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_CLEAR},
1371 {Opt_noinit_itable, EXT4_MOUNT_INIT_INODE_TABLE, MOPT_CLEAR},
1372 {Opt_commit, 0, MOPT_GTE0},
1373 {Opt_max_batch_time, 0, MOPT_GTE0},
1374 {Opt_min_batch_time, 0, MOPT_GTE0},
1375 {Opt_inode_readahead_blks, 0, MOPT_GTE0},
1376 {Opt_init_itable, 0, MOPT_GTE0},
1377 {Opt_stripe, 0, MOPT_GTE0},
1378 {Opt_resuid, 0, MOPT_GTE0},
1379 {Opt_resgid, 0, MOPT_GTE0},
1380 {Opt_journal_dev, 0, MOPT_GTE0},
1381 {Opt_journal_ioprio, 0, MOPT_GTE0},
1382 {Opt_data_journal, EXT4_MOUNT_JOURNAL_DATA, MOPT_NO_EXT2 | MOPT_DATAJ},
1383 {Opt_data_ordered, EXT4_MOUNT_ORDERED_DATA, MOPT_NO_EXT2 | MOPT_DATAJ},
1384 {Opt_data_writeback, EXT4_MOUNT_WRITEBACK_DATA,
1385 MOPT_NO_EXT2 | MOPT_DATAJ},
1386 {Opt_user_xattr, EXT4_MOUNT_XATTR_USER, MOPT_SET},
1387 {Opt_nouser_xattr, EXT4_MOUNT_XATTR_USER, MOPT_CLEAR},
1388 #ifdef CONFIG_EXT4_FS_POSIX_ACL
1389 {Opt_acl, EXT4_MOUNT_POSIX_ACL, MOPT_SET},
1390 {Opt_noacl, EXT4_MOUNT_POSIX_ACL, MOPT_CLEAR},
1391 #else
1392 {Opt_acl, 0, MOPT_NOSUPPORT},
1393 {Opt_noacl, 0, MOPT_NOSUPPORT},
1394 #endif
1395 {Opt_nouid32, EXT4_MOUNT_NO_UID32, MOPT_SET},
1396 {Opt_debug, EXT4_MOUNT_DEBUG, MOPT_SET},
1397 {Opt_quota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA, MOPT_SET | MOPT_Q},
1398 {Opt_usrquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA,
1399 MOPT_SET | MOPT_Q},
1400 {Opt_grpquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_GRPQUOTA,
1401 MOPT_SET | MOPT_Q},
1402 {Opt_noquota, (EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA |
1403 EXT4_MOUNT_GRPQUOTA), MOPT_CLEAR | MOPT_Q},
1404 {Opt_usrjquota, 0, MOPT_Q},
1405 {Opt_grpjquota, 0, MOPT_Q},
1406 {Opt_offusrjquota, 0, MOPT_Q},
1407 {Opt_offgrpjquota, 0, MOPT_Q},
1408 {Opt_jqfmt_vfsold, QFMT_VFS_OLD, MOPT_QFMT},
1409 {Opt_jqfmt_vfsv0, QFMT_VFS_V0, MOPT_QFMT},
1410 {Opt_jqfmt_vfsv1, QFMT_VFS_V1, MOPT_QFMT},
1411 {Opt_max_dir_size_kb, 0, MOPT_GTE0},
1412 {Opt_err, 0, 0}
1413 };
1414
1415 static int handle_mount_opt(struct super_block *sb, char *opt, int token,
1416 substring_t *args, unsigned long *journal_devnum,
1417 unsigned int *journal_ioprio, int is_remount)
1418 {
1419 struct ext4_sb_info *sbi = EXT4_SB(sb);
1420 const struct mount_opts *m;
1421 kuid_t uid;
1422 kgid_t gid;
1423 int arg = 0;
1424
1425 #ifdef CONFIG_QUOTA
1426 if (token == Opt_usrjquota)
1427 return set_qf_name(sb, USRQUOTA, &args[0]);
1428 else if (token == Opt_grpjquota)
1429 return set_qf_name(sb, GRPQUOTA, &args[0]);
1430 else if (token == Opt_offusrjquota)
1431 return clear_qf_name(sb, USRQUOTA);
1432 else if (token == Opt_offgrpjquota)
1433 return clear_qf_name(sb, GRPQUOTA);
1434 #endif
1435 switch (token) {
1436 case Opt_noacl:
1437 case Opt_nouser_xattr:
1438 ext4_msg(sb, KERN_WARNING, deprecated_msg, opt, "3.5");
1439 break;
1440 case Opt_sb:
1441 return 1; /* handled by get_sb_block() */
1442 case Opt_removed:
1443 ext4_msg(sb, KERN_WARNING, "Ignoring removed %s option", opt);
1444 return 1;
1445 case Opt_abort:
1446 sbi->s_mount_flags |= EXT4_MF_FS_ABORTED;
1447 return 1;
1448 case Opt_i_version:
1449 sb->s_flags |= MS_I_VERSION;
1450 return 1;
1451 }
1452
1453 for (m = ext4_mount_opts; m->token != Opt_err; m++)
1454 if (token == m->token)
1455 break;
1456
1457 if (m->token == Opt_err) {
1458 ext4_msg(sb, KERN_ERR, "Unrecognized mount option \"%s\" "
1459 "or missing value", opt);
1460 return -1;
1461 }
1462
1463 if ((m->flags & MOPT_NO_EXT2) && IS_EXT2_SB(sb)) {
1464 ext4_msg(sb, KERN_ERR,
1465 "Mount option \"%s\" incompatible with ext2", opt);
1466 return -1;
1467 }
1468 if ((m->flags & MOPT_NO_EXT3) && IS_EXT3_SB(sb)) {
1469 ext4_msg(sb, KERN_ERR,
1470 "Mount option \"%s\" incompatible with ext3", opt);
1471 return -1;
1472 }
1473
1474 if (args->from && match_int(args, &arg))
1475 return -1;
1476 if (args->from && (m->flags & MOPT_GTE0) && (arg < 0))
1477 return -1;
1478 if (m->flags & MOPT_EXPLICIT)
1479 set_opt2(sb, EXPLICIT_DELALLOC);
1480 if (m->flags & MOPT_CLEAR_ERR)
1481 clear_opt(sb, ERRORS_MASK);
1482 if (token == Opt_noquota && sb_any_quota_loaded(sb)) {
1483 ext4_msg(sb, KERN_ERR, "Cannot change quota "
1484 "options when quota turned on");
1485 return -1;
1486 }
1487
1488 if (m->flags & MOPT_NOSUPPORT) {
1489 ext4_msg(sb, KERN_ERR, "%s option not supported", opt);
1490 } else if (token == Opt_commit) {
1491 if (arg == 0)
1492 arg = JBD2_DEFAULT_MAX_COMMIT_AGE;
1493 sbi->s_commit_interval = HZ * arg;
1494 } else if (token == Opt_max_batch_time) {
1495 sbi->s_max_batch_time = arg;
1496 } else if (token == Opt_min_batch_time) {
1497 sbi->s_min_batch_time = arg;
1498 } else if (token == Opt_inode_readahead_blks) {
1499 if (arg && (arg > (1 << 30) || !is_power_of_2(arg))) {
1500 ext4_msg(sb, KERN_ERR,
1501 "EXT4-fs: inode_readahead_blks must be "
1502 "0 or a power of 2 smaller than 2^31");
1503 return -1;
1504 }
1505 sbi->s_inode_readahead_blks = arg;
1506 } else if (token == Opt_init_itable) {
1507 set_opt(sb, INIT_INODE_TABLE);
1508 if (!args->from)
1509 arg = EXT4_DEF_LI_WAIT_MULT;
1510 sbi->s_li_wait_mult = arg;
1511 } else if (token == Opt_max_dir_size_kb) {
1512 sbi->s_max_dir_size_kb = arg;
1513 } else if (token == Opt_stripe) {
1514 sbi->s_stripe = arg;
1515 } else if (token == Opt_resuid) {
1516 uid = make_kuid(current_user_ns(), arg);
1517 if (!uid_valid(uid)) {
1518 ext4_msg(sb, KERN_ERR, "Invalid uid value %d", arg);
1519 return -1;
1520 }
1521 sbi->s_resuid = uid;
1522 } else if (token == Opt_resgid) {
1523 gid = make_kgid(current_user_ns(), arg);
1524 if (!gid_valid(gid)) {
1525 ext4_msg(sb, KERN_ERR, "Invalid gid value %d", arg);
1526 return -1;
1527 }
1528 sbi->s_resgid = gid;
1529 } else if (token == Opt_journal_dev) {
1530 if (is_remount) {
1531 ext4_msg(sb, KERN_ERR,
1532 "Cannot specify journal on remount");
1533 return -1;
1534 }
1535 *journal_devnum = arg;
1536 } else if (token == Opt_journal_ioprio) {
1537 if (arg > 7) {
1538 ext4_msg(sb, KERN_ERR, "Invalid journal IO priority"
1539 " (must be 0-7)");
1540 return -1;
1541 }
1542 *journal_ioprio =
1543 IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, arg);
1544 } else if (m->flags & MOPT_DATAJ) {
1545 if (is_remount) {
1546 if (!sbi->s_journal)
1547 ext4_msg(sb, KERN_WARNING, "Remounting file system with no journal so ignoring journalled data option");
1548 else if (test_opt(sb, DATA_FLAGS) != m->mount_opt) {
1549 ext4_msg(sb, KERN_ERR,
1550 "Cannot change data mode on remount");
1551 return -1;
1552 }
1553 } else {
1554 clear_opt(sb, DATA_FLAGS);
1555 sbi->s_mount_opt |= m->mount_opt;
1556 }
1557 #ifdef CONFIG_QUOTA
1558 } else if (m->flags & MOPT_QFMT) {
1559 if (sb_any_quota_loaded(sb) &&
1560 sbi->s_jquota_fmt != m->mount_opt) {
1561 ext4_msg(sb, KERN_ERR, "Cannot change journaled "
1562 "quota options when quota turned on");
1563 return -1;
1564 }
1565 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
1566 EXT4_FEATURE_RO_COMPAT_QUOTA)) {
1567 ext4_msg(sb, KERN_ERR,
1568 "Cannot set journaled quota options "
1569 "when QUOTA feature is enabled");
1570 return -1;
1571 }
1572 sbi->s_jquota_fmt = m->mount_opt;
1573 #endif
1574 } else {
1575 if (!args->from)
1576 arg = 1;
1577 if (m->flags & MOPT_CLEAR)
1578 arg = !arg;
1579 else if (unlikely(!(m->flags & MOPT_SET))) {
1580 ext4_msg(sb, KERN_WARNING,
1581 "buggy handling of option %s", opt);
1582 WARN_ON(1);
1583 return -1;
1584 }
1585 if (arg != 0)
1586 sbi->s_mount_opt |= m->mount_opt;
1587 else
1588 sbi->s_mount_opt &= ~m->mount_opt;
1589 }
1590 return 1;
1591 }
1592
1593 static int parse_options(char *options, struct super_block *sb,
1594 unsigned long *journal_devnum,
1595 unsigned int *journal_ioprio,
1596 int is_remount)
1597 {
1598 struct ext4_sb_info *sbi = EXT4_SB(sb);
1599 char *p;
1600 substring_t args[MAX_OPT_ARGS];
1601 int token;
1602
1603 if (!options)
1604 return 1;
1605
1606 while ((p = strsep(&options, ",")) != NULL) {
1607 if (!*p)
1608 continue;
1609 /*
1610 * Initialize args struct so we know whether arg was
1611 * found; some options take optional arguments.
1612 */
1613 args[0].to = args[0].from = NULL;
1614 token = match_token(p, tokens, args);
1615 if (handle_mount_opt(sb, p, token, args, journal_devnum,
1616 journal_ioprio, is_remount) < 0)
1617 return 0;
1618 }
1619 #ifdef CONFIG_QUOTA
1620 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) &&
1621 (test_opt(sb, USRQUOTA) || test_opt(sb, GRPQUOTA))) {
1622 ext4_msg(sb, KERN_ERR, "Cannot set quota options when QUOTA "
1623 "feature is enabled");
1624 return 0;
1625 }
1626 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1627 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
1628 clear_opt(sb, USRQUOTA);
1629
1630 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
1631 clear_opt(sb, GRPQUOTA);
1632
1633 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
1634 ext4_msg(sb, KERN_ERR, "old and new quota "
1635 "format mixing");
1636 return 0;
1637 }
1638
1639 if (!sbi->s_jquota_fmt) {
1640 ext4_msg(sb, KERN_ERR, "journaled quota format "
1641 "not specified");
1642 return 0;
1643 }
1644 }
1645 #endif
1646 if (test_opt(sb, DIOREAD_NOLOCK)) {
1647 int blocksize =
1648 BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);
1649
1650 if (blocksize < PAGE_CACHE_SIZE) {
1651 ext4_msg(sb, KERN_ERR, "can't mount with "
1652 "dioread_nolock if block size != PAGE_SIZE");
1653 return 0;
1654 }
1655 }
1656 return 1;
1657 }
1658
1659 static inline void ext4_show_quota_options(struct seq_file *seq,
1660 struct super_block *sb)
1661 {
1662 #if defined(CONFIG_QUOTA)
1663 struct ext4_sb_info *sbi = EXT4_SB(sb);
1664
1665 if (sbi->s_jquota_fmt) {
1666 char *fmtname = "";
1667
1668 switch (sbi->s_jquota_fmt) {
1669 case QFMT_VFS_OLD:
1670 fmtname = "vfsold";
1671 break;
1672 case QFMT_VFS_V0:
1673 fmtname = "vfsv0";
1674 break;
1675 case QFMT_VFS_V1:
1676 fmtname = "vfsv1";
1677 break;
1678 }
1679 seq_printf(seq, ",jqfmt=%s", fmtname);
1680 }
1681
1682 if (sbi->s_qf_names[USRQUOTA])
1683 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
1684
1685 if (sbi->s_qf_names[GRPQUOTA])
1686 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
1687 #endif
1688 }
1689
1690 static const char *token2str(int token)
1691 {
1692 const struct match_token *t;
1693
1694 for (t = tokens; t->token != Opt_err; t++)
1695 if (t->token == token && !strchr(t->pattern, '='))
1696 break;
1697 return t->pattern;
1698 }
1699
1700 /*
1701 * Show an option if
1702 * - it's set to a non-default value OR
1703 * - if the per-sb default is different from the global default
1704 */
1705 static int _ext4_show_options(struct seq_file *seq, struct super_block *sb,
1706 int nodefs)
1707 {
1708 struct ext4_sb_info *sbi = EXT4_SB(sb);
1709 struct ext4_super_block *es = sbi->s_es;
1710 int def_errors, def_mount_opt = nodefs ? 0 : sbi->s_def_mount_opt;
1711 const struct mount_opts *m;
1712 char sep = nodefs ? '\n' : ',';
1713
1714 #define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep)
1715 #define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg)
1716
1717 if (sbi->s_sb_block != 1)
1718 SEQ_OPTS_PRINT("sb=%llu", sbi->s_sb_block);
1719
1720 for (m = ext4_mount_opts; m->token != Opt_err; m++) {
1721 int want_set = m->flags & MOPT_SET;
1722 if (((m->flags & (MOPT_SET|MOPT_CLEAR)) == 0) ||
1723 (m->flags & MOPT_CLEAR_ERR))
1724 continue;
1725 if (!(m->mount_opt & (sbi->s_mount_opt ^ def_mount_opt)))
1726 continue; /* skip if same as the default */
1727 if ((want_set &&
1728 (sbi->s_mount_opt & m->mount_opt) != m->mount_opt) ||
1729 (!want_set && (sbi->s_mount_opt & m->mount_opt)))
1730 continue; /* select Opt_noFoo vs Opt_Foo */
1731 SEQ_OPTS_PRINT("%s", token2str(m->token));
1732 }
1733
1734 if (nodefs || !uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT4_DEF_RESUID)) ||
1735 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID)
1736 SEQ_OPTS_PRINT("resuid=%u",
1737 from_kuid_munged(&init_user_ns, sbi->s_resuid));
1738 if (nodefs || !gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT4_DEF_RESGID)) ||
1739 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID)
1740 SEQ_OPTS_PRINT("resgid=%u",
1741 from_kgid_munged(&init_user_ns, sbi->s_resgid));
1742 def_errors = nodefs ? -1 : le16_to_cpu(es->s_errors);
1743 if (test_opt(sb, ERRORS_RO) && def_errors != EXT4_ERRORS_RO)
1744 SEQ_OPTS_PUTS("errors=remount-ro");
1745 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
1746 SEQ_OPTS_PUTS("errors=continue");
1747 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
1748 SEQ_OPTS_PUTS("errors=panic");
1749 if (nodefs || sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ)
1750 SEQ_OPTS_PRINT("commit=%lu", sbi->s_commit_interval / HZ);
1751 if (nodefs || sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME)
1752 SEQ_OPTS_PRINT("min_batch_time=%u", sbi->s_min_batch_time);
1753 if (nodefs || sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME)
1754 SEQ_OPTS_PRINT("max_batch_time=%u", sbi->s_max_batch_time);
1755 if (sb->s_flags & MS_I_VERSION)
1756 SEQ_OPTS_PUTS("i_version");
1757 if (nodefs || sbi->s_stripe)
1758 SEQ_OPTS_PRINT("stripe=%lu", sbi->s_stripe);
1759 if (EXT4_MOUNT_DATA_FLAGS & (sbi->s_mount_opt ^ def_mount_opt)) {
1760 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
1761 SEQ_OPTS_PUTS("data=journal");
1762 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
1763 SEQ_OPTS_PUTS("data=ordered");
1764 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
1765 SEQ_OPTS_PUTS("data=writeback");
1766 }
1767 if (nodefs ||
1768 sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
1769 SEQ_OPTS_PRINT("inode_readahead_blks=%u",
1770 sbi->s_inode_readahead_blks);
1771
1772 if (nodefs || (test_opt(sb, INIT_INODE_TABLE) &&
1773 (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT)))
1774 SEQ_OPTS_PRINT("init_itable=%u", sbi->s_li_wait_mult);
1775 if (nodefs || sbi->s_max_dir_size_kb)
1776 SEQ_OPTS_PRINT("max_dir_size_kb=%u", sbi->s_max_dir_size_kb);
1777
1778 ext4_show_quota_options(seq, sb);
1779 return 0;
1780 }
1781
1782 static int ext4_show_options(struct seq_file *seq, struct dentry *root)
1783 {
1784 return _ext4_show_options(seq, root->d_sb, 0);
1785 }
1786
1787 static int options_seq_show(struct seq_file *seq, void *offset)
1788 {
1789 struct super_block *sb = seq->private;
1790 int rc;
1791
1792 seq_puts(seq, (sb->s_flags & MS_RDONLY) ? "ro" : "rw");
1793 rc = _ext4_show_options(seq, sb, 1);
1794 seq_puts(seq, "\n");
1795 return rc;
1796 }
1797
1798 static int options_open_fs(struct inode *inode, struct file *file)
1799 {
1800 return single_open(file, options_seq_show, PDE_DATA(inode));
1801 }
1802
1803 static const struct file_operations ext4_seq_options_fops = {
1804 .owner = THIS_MODULE,
1805 .open = options_open_fs,
1806 .read = seq_read,
1807 .llseek = seq_lseek,
1808 .release = single_release,
1809 };
1810
1811 static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
1812 int read_only)
1813 {
1814 struct ext4_sb_info *sbi = EXT4_SB(sb);
1815 int res = 0;
1816
1817 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
1818 ext4_msg(sb, KERN_ERR, "revision level too high, "
1819 "forcing read-only mode");
1820 res = MS_RDONLY;
1821 }
1822 if (read_only)
1823 goto done;
1824 if (!(sbi->s_mount_state & EXT4_VALID_FS))
1825 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
1826 "running e2fsck is recommended");
1827 else if ((sbi->s_mount_state & EXT4_ERROR_FS))
1828 ext4_msg(sb, KERN_WARNING,
1829 "warning: mounting fs with errors, "
1830 "running e2fsck is recommended");
1831 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
1832 le16_to_cpu(es->s_mnt_count) >=
1833 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
1834 ext4_msg(sb, KERN_WARNING,
1835 "warning: maximal mount count reached, "
1836 "running e2fsck is recommended");
1837 else if (le32_to_cpu(es->s_checkinterval) &&
1838 (le32_to_cpu(es->s_lastcheck) +
1839 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1840 ext4_msg(sb, KERN_WARNING,
1841 "warning: checktime reached, "
1842 "running e2fsck is recommended");
1843 if (!sbi->s_journal)
1844 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
1845 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
1846 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
1847 le16_add_cpu(&es->s_mnt_count, 1);
1848 es->s_mtime = cpu_to_le32(get_seconds());
1849 ext4_update_dynamic_rev(sb);
1850 if (sbi->s_journal)
1851 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
1852
1853 ext4_commit_super(sb, 1);
1854 done:
1855 if (test_opt(sb, DEBUG))
1856 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
1857 "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
1858 sb->s_blocksize,
1859 sbi->s_groups_count,
1860 EXT4_BLOCKS_PER_GROUP(sb),
1861 EXT4_INODES_PER_GROUP(sb),
1862 sbi->s_mount_opt, sbi->s_mount_opt2);
1863
1864 cleancache_init_fs(sb);
1865 return res;
1866 }
1867
1868 int ext4_alloc_flex_bg_array(struct super_block *sb, ext4_group_t ngroup)
1869 {
1870 struct ext4_sb_info *sbi = EXT4_SB(sb);
1871 struct flex_groups *new_groups;
1872 int size;
1873
1874 if (!sbi->s_log_groups_per_flex)
1875 return 0;
1876
1877 size = ext4_flex_group(sbi, ngroup - 1) + 1;
1878 if (size <= sbi->s_flex_groups_allocated)
1879 return 0;
1880
1881 size = roundup_pow_of_two(size * sizeof(struct flex_groups));
1882 new_groups = ext4_kvzalloc(size, GFP_KERNEL);
1883 if (!new_groups) {
1884 ext4_msg(sb, KERN_ERR, "not enough memory for %d flex groups",
1885 size / (int) sizeof(struct flex_groups));
1886 return -ENOMEM;
1887 }
1888
1889 if (sbi->s_flex_groups) {
1890 memcpy(new_groups, sbi->s_flex_groups,
1891 (sbi->s_flex_groups_allocated *
1892 sizeof(struct flex_groups)));
1893 ext4_kvfree(sbi->s_flex_groups);
1894 }
1895 sbi->s_flex_groups = new_groups;
1896 sbi->s_flex_groups_allocated = size / sizeof(struct flex_groups);
1897 return 0;
1898 }
1899
1900 static int ext4_fill_flex_info(struct super_block *sb)
1901 {
1902 struct ext4_sb_info *sbi = EXT4_SB(sb);
1903 struct ext4_group_desc *gdp = NULL;
1904 ext4_group_t flex_group;
1905 unsigned int groups_per_flex = 0;
1906 int i, err;
1907
1908 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
1909 if (sbi->s_log_groups_per_flex < 1 || sbi->s_log_groups_per_flex > 31) {
1910 sbi->s_log_groups_per_flex = 0;
1911 return 1;
1912 }
1913 groups_per_flex = 1U << sbi->s_log_groups_per_flex;
1914
1915 err = ext4_alloc_flex_bg_array(sb, sbi->s_groups_count);
1916 if (err)
1917 goto failed;
1918
1919 for (i = 0; i < sbi->s_groups_count; i++) {
1920 gdp = ext4_get_group_desc(sb, i, NULL);
1921
1922 flex_group = ext4_flex_group(sbi, i);
1923 atomic_add(ext4_free_inodes_count(sb, gdp),
1924 &sbi->s_flex_groups[flex_group].free_inodes);
1925 atomic64_add(ext4_free_group_clusters(sb, gdp),
1926 &sbi->s_flex_groups[flex_group].free_clusters);
1927 atomic_add(ext4_used_dirs_count(sb, gdp),
1928 &sbi->s_flex_groups[flex_group].used_dirs);
1929 }
1930
1931 return 1;
1932 failed:
1933 return 0;
1934 }
1935
1936 static __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
1937 struct ext4_group_desc *gdp)
1938 {
1939 int offset;
1940 __u16 crc = 0;
1941 __le32 le_group = cpu_to_le32(block_group);
1942
1943 if ((sbi->s_es->s_feature_ro_compat &
1944 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))) {
1945 /* Use new metadata_csum algorithm */
1946 __le16 save_csum;
1947 __u32 csum32;
1948
1949 save_csum = gdp->bg_checksum;
1950 gdp->bg_checksum = 0;
1951 csum32 = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&le_group,
1952 sizeof(le_group));
1953 csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp,
1954 sbi->s_desc_size);
1955 gdp->bg_checksum = save_csum;
1956
1957 crc = csum32 & 0xFFFF;
1958 goto out;
1959 }
1960
1961 /* old crc16 code */
1962 if (!(sbi->s_es->s_feature_ro_compat &
1963 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)))
1964 return 0;
1965
1966 offset = offsetof(struct ext4_group_desc, bg_checksum);
1967
1968 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
1969 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
1970 crc = crc16(crc, (__u8 *)gdp, offset);
1971 offset += sizeof(gdp->bg_checksum); /* skip checksum */
1972 /* for checksum of struct ext4_group_desc do the rest...*/
1973 if ((sbi->s_es->s_feature_incompat &
1974 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) &&
1975 offset < le16_to_cpu(sbi->s_es->s_desc_size))
1976 crc = crc16(crc, (__u8 *)gdp + offset,
1977 le16_to_cpu(sbi->s_es->s_desc_size) -
1978 offset);
1979
1980 out:
1981 return cpu_to_le16(crc);
1982 }
1983
1984 int ext4_group_desc_csum_verify(struct super_block *sb, __u32 block_group,
1985 struct ext4_group_desc *gdp)
1986 {
1987 if (ext4_has_group_desc_csum(sb) &&
1988 (gdp->bg_checksum != ext4_group_desc_csum(EXT4_SB(sb),
1989 block_group, gdp)))
1990 return 0;
1991
1992 return 1;
1993 }
1994
1995 void ext4_group_desc_csum_set(struct super_block *sb, __u32 block_group,
1996 struct ext4_group_desc *gdp)
1997 {
1998 if (!ext4_has_group_desc_csum(sb))
1999 return;
2000 gdp->bg_checksum = ext4_group_desc_csum(EXT4_SB(sb), block_group, gdp);
2001 }
2002
2003 /* Called at mount-time, super-block is locked */
2004 static int ext4_check_descriptors(struct super_block *sb,
2005 ext4_group_t *first_not_zeroed)
2006 {
2007 struct ext4_sb_info *sbi = EXT4_SB(sb);
2008 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
2009 ext4_fsblk_t last_block;
2010 ext4_fsblk_t block_bitmap;
2011 ext4_fsblk_t inode_bitmap;
2012 ext4_fsblk_t inode_table;
2013 int flexbg_flag = 0;
2014 ext4_group_t i, grp = sbi->s_groups_count;
2015
2016 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
2017 flexbg_flag = 1;
2018
2019 ext4_debug("Checking group descriptors");
2020
2021 for (i = 0; i < sbi->s_groups_count; i++) {
2022 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
2023
2024 if (i == sbi->s_groups_count - 1 || flexbg_flag)
2025 last_block = ext4_blocks_count(sbi->s_es) - 1;
2026 else
2027 last_block = first_block +
2028 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
2029
2030 if ((grp == sbi->s_groups_count) &&
2031 !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2032 grp = i;
2033
2034 block_bitmap = ext4_block_bitmap(sb, gdp);
2035 if (block_bitmap < first_block || block_bitmap > last_block) {
2036 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2037 "Block bitmap for group %u not in group "
2038 "(block %llu)!", i, block_bitmap);
2039 return 0;
2040 }
2041 inode_bitmap = ext4_inode_bitmap(sb, gdp);
2042 if (inode_bitmap < first_block || inode_bitmap > last_block) {
2043 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2044 "Inode bitmap for group %u not in group "
2045 "(block %llu)!", i, inode_bitmap);
2046 return 0;
2047 }
2048 inode_table = ext4_inode_table(sb, gdp);
2049 if (inode_table < first_block ||
2050 inode_table + sbi->s_itb_per_group - 1 > last_block) {
2051 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2052 "Inode table for group %u not in group "
2053 "(block %llu)!", i, inode_table);
2054 return 0;
2055 }
2056 ext4_lock_group(sb, i);
2057 if (!ext4_group_desc_csum_verify(sb, i, gdp)) {
2058 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2059 "Checksum for group %u failed (%u!=%u)",
2060 i, le16_to_cpu(ext4_group_desc_csum(sbi, i,
2061 gdp)), le16_to_cpu(gdp->bg_checksum));
2062 if (!(sb->s_flags & MS_RDONLY)) {
2063 ext4_unlock_group(sb, i);
2064 return 0;
2065 }
2066 }
2067 ext4_unlock_group(sb, i);
2068 if (!flexbg_flag)
2069 first_block += EXT4_BLOCKS_PER_GROUP(sb);
2070 }
2071 if (NULL != first_not_zeroed)
2072 *first_not_zeroed = grp;
2073
2074 ext4_free_blocks_count_set(sbi->s_es,
2075 EXT4_C2B(sbi, ext4_count_free_clusters(sb)));
2076 sbi->s_es->s_free_inodes_count =cpu_to_le32(ext4_count_free_inodes(sb));
2077 return 1;
2078 }
2079
2080 /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
2081 * the superblock) which were deleted from all directories, but held open by
2082 * a process at the time of a crash. We walk the list and try to delete these
2083 * inodes at recovery time (only with a read-write filesystem).
2084 *
2085 * In order to keep the orphan inode chain consistent during traversal (in
2086 * case of crash during recovery), we link each inode into the superblock
2087 * orphan list_head and handle it the same way as an inode deletion during
2088 * normal operation (which journals the operations for us).
2089 *
2090 * We only do an iget() and an iput() on each inode, which is very safe if we
2091 * accidentally point at an in-use or already deleted inode. The worst that
2092 * can happen in this case is that we get a "bit already cleared" message from
2093 * ext4_free_inode(). The only reason we would point at a wrong inode is if
2094 * e2fsck was run on this filesystem, and it must have already done the orphan
2095 * inode cleanup for us, so we can safely abort without any further action.
2096 */
2097 static void ext4_orphan_cleanup(struct super_block *sb,
2098 struct ext4_super_block *es)
2099 {
2100 unsigned int s_flags = sb->s_flags;
2101 int nr_orphans = 0, nr_truncates = 0;
2102 #ifdef CONFIG_QUOTA
2103 int i;
2104 #endif
2105 if (!es->s_last_orphan) {
2106 jbd_debug(4, "no orphan inodes to clean up\n");
2107 return;
2108 }
2109
2110 if (bdev_read_only(sb->s_bdev)) {
2111 ext4_msg(sb, KERN_ERR, "write access "
2112 "unavailable, skipping orphan cleanup");
2113 return;
2114 }
2115
2116 /* Check if feature set would not allow a r/w mount */
2117 if (!ext4_feature_set_ok(sb, 0)) {
2118 ext4_msg(sb, KERN_INFO, "Skipping orphan cleanup due to "
2119 "unknown ROCOMPAT features");
2120 return;
2121 }
2122
2123 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
2124 /* don't clear list on RO mount w/ errors */
2125 if (es->s_last_orphan && !(s_flags & MS_RDONLY)) {
2126 jbd_debug(1, "Errors on filesystem, "
2127 "clearing orphan list.\n");
2128 es->s_last_orphan = 0;
2129 }
2130 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2131 return;
2132 }
2133
2134 if (s_flags & MS_RDONLY) {
2135 ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
2136 sb->s_flags &= ~MS_RDONLY;
2137 }
2138 #ifdef CONFIG_QUOTA
2139 /* Needed for iput() to work correctly and not trash data */
2140 sb->s_flags |= MS_ACTIVE;
2141 /* Turn on quotas so that they are updated correctly */
2142 for (i = 0; i < MAXQUOTAS; i++) {
2143 if (EXT4_SB(sb)->s_qf_names[i]) {
2144 int ret = ext4_quota_on_mount(sb, i);
2145 if (ret < 0)
2146 ext4_msg(sb, KERN_ERR,
2147 "Cannot turn on journaled "
2148 "quota: error %d", ret);
2149 }
2150 }
2151 #endif
2152
2153 while (es->s_last_orphan) {
2154 struct inode *inode;
2155
2156 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
2157 if (IS_ERR(inode)) {
2158 es->s_last_orphan = 0;
2159 break;
2160 }
2161
2162 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
2163 dquot_initialize(inode);
2164 if (inode->i_nlink) {
2165 ext4_msg(sb, KERN_DEBUG,
2166 "%s: truncating inode %lu to %lld bytes",
2167 __func__, inode->i_ino, inode->i_size);
2168 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
2169 inode->i_ino, inode->i_size);
2170 mutex_lock(&inode->i_mutex);
2171 ext4_truncate(inode);
2172 mutex_unlock(&inode->i_mutex);
2173 nr_truncates++;
2174 } else {
2175 ext4_msg(sb, KERN_DEBUG,
2176 "%s: deleting unreferenced inode %lu",
2177 __func__, inode->i_ino);
2178 jbd_debug(2, "deleting unreferenced inode %lu\n",
2179 inode->i_ino);
2180 nr_orphans++;
2181 }
2182 iput(inode); /* The delete magic happens here! */
2183 }
2184
2185 #define PLURAL(x) (x), ((x) == 1) ? "" : "s"
2186
2187 if (nr_orphans)
2188 ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
2189 PLURAL(nr_orphans));
2190 if (nr_truncates)
2191 ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
2192 PLURAL(nr_truncates));
2193 #ifdef CONFIG_QUOTA
2194 /* Turn quotas off */
2195 for (i = 0; i < MAXQUOTAS; i++) {
2196 if (sb_dqopt(sb)->files[i])
2197 dquot_quota_off(sb, i);
2198 }
2199 #endif
2200 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
2201 }
2202
2203 /*
2204 * Maximal extent format file size.
2205 * Resulting logical blkno at s_maxbytes must fit in our on-disk
2206 * extent format containers, within a sector_t, and within i_blocks
2207 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
2208 * so that won't be a limiting factor.
2209 *
2210 * However there is other limiting factor. We do store extents in the form
2211 * of starting block and length, hence the resulting length of the extent
2212 * covering maximum file size must fit into on-disk format containers as
2213 * well. Given that length is always by 1 unit bigger than max unit (because
2214 * we count 0 as well) we have to lower the s_maxbytes by one fs block.
2215 *
2216 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
2217 */
2218 static loff_t ext4_max_size(int blkbits, int has_huge_files)
2219 {
2220 loff_t res;
2221 loff_t upper_limit = MAX_LFS_FILESIZE;
2222
2223 /* small i_blocks in vfs inode? */
2224 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
2225 /*
2226 * CONFIG_LBDAF is not enabled implies the inode
2227 * i_block represent total blocks in 512 bytes
2228 * 32 == size of vfs inode i_blocks * 8
2229 */
2230 upper_limit = (1LL << 32) - 1;
2231
2232 /* total blocks in file system block size */
2233 upper_limit >>= (blkbits - 9);
2234 upper_limit <<= blkbits;
2235 }
2236
2237 /*
2238 * 32-bit extent-start container, ee_block. We lower the maxbytes
2239 * by one fs block, so ee_len can cover the extent of maximum file
2240 * size
2241 */
2242 res = (1LL << 32) - 1;
2243 res <<= blkbits;
2244
2245 /* Sanity check against vm- & vfs- imposed limits */
2246 if (res > upper_limit)
2247 res = upper_limit;
2248
2249 return res;
2250 }
2251
2252 /*
2253 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
2254 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2255 * We need to be 1 filesystem block less than the 2^48 sector limit.
2256 */
2257 static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
2258 {
2259 loff_t res = EXT4_NDIR_BLOCKS;
2260 int meta_blocks;
2261 loff_t upper_limit;
2262 /* This is calculated to be the largest file size for a dense, block
2263 * mapped file such that the file's total number of 512-byte sectors,
2264 * including data and all indirect blocks, does not exceed (2^48 - 1).
2265 *
2266 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2267 * number of 512-byte sectors of the file.
2268 */
2269
2270 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
2271 /*
2272 * !has_huge_files or CONFIG_LBDAF not enabled implies that
2273 * the inode i_block field represents total file blocks in
2274 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
2275 */
2276 upper_limit = (1LL << 32) - 1;
2277
2278 /* total blocks in file system block size */
2279 upper_limit >>= (bits - 9);
2280
2281 } else {
2282 /*
2283 * We use 48 bit ext4_inode i_blocks
2284 * With EXT4_HUGE_FILE_FL set the i_blocks
2285 * represent total number of blocks in
2286 * file system block size
2287 */
2288 upper_limit = (1LL << 48) - 1;
2289
2290 }
2291
2292 /* indirect blocks */
2293 meta_blocks = 1;
2294 /* double indirect blocks */
2295 meta_blocks += 1 + (1LL << (bits-2));
2296 /* tripple indirect blocks */
2297 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
2298
2299 upper_limit -= meta_blocks;
2300 upper_limit <<= bits;
2301
2302 res += 1LL << (bits-2);
2303 res += 1LL << (2*(bits-2));
2304 res += 1LL << (3*(bits-2));
2305 res <<= bits;
2306 if (res > upper_limit)
2307 res = upper_limit;
2308
2309 if (res > MAX_LFS_FILESIZE)
2310 res = MAX_LFS_FILESIZE;
2311
2312 return res;
2313 }
2314
2315 static ext4_fsblk_t descriptor_loc(struct super_block *sb,
2316 ext4_fsblk_t logical_sb_block, int nr)
2317 {
2318 struct ext4_sb_info *sbi = EXT4_SB(sb);
2319 ext4_group_t bg, first_meta_bg;
2320 int has_super = 0;
2321
2322 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
2323
2324 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
2325 nr < first_meta_bg)
2326 return logical_sb_block + nr + 1;
2327 bg = sbi->s_desc_per_block * nr;
2328 if (ext4_bg_has_super(sb, bg))
2329 has_super = 1;
2330
2331 return (has_super + ext4_group_first_block_no(sb, bg));
2332 }
2333
2334 /**
2335 * ext4_get_stripe_size: Get the stripe size.
2336 * @sbi: In memory super block info
2337 *
2338 * If we have specified it via mount option, then
2339 * use the mount option value. If the value specified at mount time is
2340 * greater than the blocks per group use the super block value.
2341 * If the super block value is greater than blocks per group return 0.
2342 * Allocator needs it be less than blocks per group.
2343 *
2344 */
2345 static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
2346 {
2347 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
2348 unsigned long stripe_width =
2349 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
2350 int ret;
2351
2352 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
2353 ret = sbi->s_stripe;
2354 else if (stripe_width <= sbi->s_blocks_per_group)
2355 ret = stripe_width;
2356 else if (stride <= sbi->s_blocks_per_group)
2357 ret = stride;
2358 else
2359 ret = 0;
2360
2361 /*
2362 * If the stripe width is 1, this makes no sense and
2363 * we set it to 0 to turn off stripe handling code.
2364 */
2365 if (ret <= 1)
2366 ret = 0;
2367
2368 return ret;
2369 }
2370
2371 /* sysfs supprt */
2372
2373 struct ext4_attr {
2374 struct attribute attr;
2375 ssize_t (*show)(struct ext4_attr *, struct ext4_sb_info *, char *);
2376 ssize_t (*store)(struct ext4_attr *, struct ext4_sb_info *,
2377 const char *, size_t);
2378 int offset;
2379 };
2380
2381 static int parse_strtoull(const char *buf,
2382 unsigned long long max, unsigned long long *value)
2383 {
2384 int ret;
2385
2386 ret = kstrtoull(skip_spaces(buf), 0, value);
2387 if (!ret && *value > max)
2388 ret = -EINVAL;
2389 return ret;
2390 }
2391
2392 static ssize_t delayed_allocation_blocks_show(struct ext4_attr *a,
2393 struct ext4_sb_info *sbi,
2394 char *buf)
2395 {
2396 return snprintf(buf, PAGE_SIZE, "%llu\n",
2397 (s64) EXT4_C2B(sbi,
2398 percpu_counter_sum(&sbi->s_dirtyclusters_counter)));
2399 }
2400
2401 static ssize_t session_write_kbytes_show(struct ext4_attr *a,
2402 struct ext4_sb_info *sbi, char *buf)
2403 {
2404 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2405
2406 if (!sb->s_bdev->bd_part)
2407 return snprintf(buf, PAGE_SIZE, "0\n");
2408 return snprintf(buf, PAGE_SIZE, "%lu\n",
2409 (part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
2410 sbi->s_sectors_written_start) >> 1);
2411 }
2412
2413 static ssize_t lifetime_write_kbytes_show(struct ext4_attr *a,
2414 struct ext4_sb_info *sbi, char *buf)
2415 {
2416 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2417
2418 if (!sb->s_bdev->bd_part)
2419 return snprintf(buf, PAGE_SIZE, "0\n");
2420 return snprintf(buf, PAGE_SIZE, "%llu\n",
2421 (unsigned long long)(sbi->s_kbytes_written +
2422 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
2423 EXT4_SB(sb)->s_sectors_written_start) >> 1)));
2424 }
2425
2426 static ssize_t inode_readahead_blks_store(struct ext4_attr *a,
2427 struct ext4_sb_info *sbi,
2428 const char *buf, size_t count)
2429 {
2430 unsigned long t;
2431 int ret;
2432
2433 ret = kstrtoul(skip_spaces(buf), 0, &t);
2434 if (ret)
2435 return ret;
2436
2437 if (t && (!is_power_of_2(t) || t > 0x40000000))
2438 return -EINVAL;
2439
2440 sbi->s_inode_readahead_blks = t;
2441 return count;
2442 }
2443
2444 static ssize_t sbi_ui_show(struct ext4_attr *a,
2445 struct ext4_sb_info *sbi, char *buf)
2446 {
2447 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
2448
2449 return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
2450 }
2451
2452 static ssize_t sbi_ui_store(struct ext4_attr *a,
2453 struct ext4_sb_info *sbi,
2454 const char *buf, size_t count)
2455 {
2456 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
2457 unsigned long t;
2458 int ret;
2459
2460 ret = kstrtoul(skip_spaces(buf), 0, &t);
2461 if (ret)
2462 return ret;
2463 *ui = t;
2464 return count;
2465 }
2466
2467 static ssize_t reserved_clusters_show(struct ext4_attr *a,
2468 struct ext4_sb_info *sbi, char *buf)
2469 {
2470 return snprintf(buf, PAGE_SIZE, "%llu\n",
2471 (unsigned long long) atomic64_read(&sbi->s_resv_clusters));
2472 }
2473
2474 static ssize_t reserved_clusters_store(struct ext4_attr *a,
2475 struct ext4_sb_info *sbi,
2476 const char *buf, size_t count)
2477 {
2478 unsigned long long val;
2479 int ret;
2480
2481 if (parse_strtoull(buf, -1ULL, &val))
2482 return -EINVAL;
2483 ret = ext4_reserve_clusters(sbi, val);
2484
2485 return ret ? ret : count;
2486 }
2487
2488 static ssize_t trigger_test_error(struct ext4_attr *a,
2489 struct ext4_sb_info *sbi,
2490 const char *buf, size_t count)
2491 {
2492 int len = count;
2493
2494 if (!capable(CAP_SYS_ADMIN))
2495 return -EPERM;
2496
2497 if (len && buf[len-1] == '\n')
2498 len--;
2499
2500 if (len)
2501 ext4_error(sbi->s_sb, "%.*s", len, buf);
2502 return count;
2503 }
2504
2505 #define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \
2506 static struct ext4_attr ext4_attr_##_name = { \
2507 .attr = {.name = __stringify(_name), .mode = _mode }, \
2508 .show = _show, \
2509 .store = _store, \
2510 .offset = offsetof(struct ext4_sb_info, _elname), \
2511 }
2512 #define EXT4_ATTR(name, mode, show, store) \
2513 static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store)
2514
2515 #define EXT4_INFO_ATTR(name) EXT4_ATTR(name, 0444, NULL, NULL)
2516 #define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL)
2517 #define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store)
2518 #define EXT4_RW_ATTR_SBI_UI(name, elname) \
2519 EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname)
2520 #define ATTR_LIST(name) &ext4_attr_##name.attr
2521
2522 EXT4_RO_ATTR(delayed_allocation_blocks);
2523 EXT4_RO_ATTR(session_write_kbytes);
2524 EXT4_RO_ATTR(lifetime_write_kbytes);
2525 EXT4_RW_ATTR(reserved_clusters);
2526 EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, sbi_ui_show,
2527 inode_readahead_blks_store, s_inode_readahead_blks);
2528 EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal);
2529 EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats);
2530 EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan);
2531 EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan);
2532 EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs);
2533 EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request);
2534 EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc);
2535 EXT4_RW_ATTR_SBI_UI(max_writeback_mb_bump, s_max_writeback_mb_bump);
2536 EXT4_RW_ATTR_SBI_UI(extent_max_zeroout_kb, s_extent_max_zeroout_kb);
2537 EXT4_ATTR(trigger_fs_error, 0200, NULL, trigger_test_error);
2538
2539 static struct attribute *ext4_attrs[] = {
2540 ATTR_LIST(delayed_allocation_blocks),
2541 ATTR_LIST(session_write_kbytes),
2542 ATTR_LIST(lifetime_write_kbytes),
2543 ATTR_LIST(reserved_clusters),
2544 ATTR_LIST(inode_readahead_blks),
2545 ATTR_LIST(inode_goal),
2546 ATTR_LIST(mb_stats),
2547 ATTR_LIST(mb_max_to_scan),
2548 ATTR_LIST(mb_min_to_scan),
2549 ATTR_LIST(mb_order2_req),
2550 ATTR_LIST(mb_stream_req),
2551 ATTR_LIST(mb_group_prealloc),
2552 ATTR_LIST(max_writeback_mb_bump),
2553 ATTR_LIST(extent_max_zeroout_kb),
2554 ATTR_LIST(trigger_fs_error),
2555 NULL,
2556 };
2557
2558 /* Features this copy of ext4 supports */
2559 EXT4_INFO_ATTR(lazy_itable_init);
2560 EXT4_INFO_ATTR(batched_discard);
2561 EXT4_INFO_ATTR(meta_bg_resize);
2562
2563 static struct attribute *ext4_feat_attrs[] = {
2564 ATTR_LIST(lazy_itable_init),
2565 ATTR_LIST(batched_discard),
2566 ATTR_LIST(meta_bg_resize),
2567 NULL,
2568 };
2569
2570 static ssize_t ext4_attr_show(struct kobject *kobj,
2571 struct attribute *attr, char *buf)
2572 {
2573 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2574 s_kobj);
2575 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2576
2577 return a->show ? a->show(a, sbi, buf) : 0;
2578 }
2579
2580 static ssize_t ext4_attr_store(struct kobject *kobj,
2581 struct attribute *attr,
2582 const char *buf, size_t len)
2583 {
2584 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2585 s_kobj);
2586 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2587
2588 return a->store ? a->store(a, sbi, buf, len) : 0;
2589 }
2590
2591 static void ext4_sb_release(struct kobject *kobj)
2592 {
2593 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2594 s_kobj);
2595 complete(&sbi->s_kobj_unregister);
2596 }
2597
2598 static const struct sysfs_ops ext4_attr_ops = {
2599 .show = ext4_attr_show,
2600 .store = ext4_attr_store,
2601 };
2602
2603 static struct kobj_type ext4_ktype = {
2604 .default_attrs = ext4_attrs,
2605 .sysfs_ops = &ext4_attr_ops,
2606 .release = ext4_sb_release,
2607 };
2608
2609 static void ext4_feat_release(struct kobject *kobj)
2610 {
2611 complete(&ext4_feat->f_kobj_unregister);
2612 }
2613
2614 static struct kobj_type ext4_feat_ktype = {
2615 .default_attrs = ext4_feat_attrs,
2616 .sysfs_ops = &ext4_attr_ops,
2617 .release = ext4_feat_release,
2618 };
2619
2620 /*
2621 * Check whether this filesystem can be mounted based on
2622 * the features present and the RDONLY/RDWR mount requested.
2623 * Returns 1 if this filesystem can be mounted as requested,
2624 * 0 if it cannot be.
2625 */
2626 static int ext4_feature_set_ok(struct super_block *sb, int readonly)
2627 {
2628 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP)) {
2629 ext4_msg(sb, KERN_ERR,
2630 "Couldn't mount because of "
2631 "unsupported optional features (%x)",
2632 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
2633 ~EXT4_FEATURE_INCOMPAT_SUPP));
2634 return 0;
2635 }
2636
2637 if (readonly)
2638 return 1;
2639
2640 /* Check that feature set is OK for a read-write mount */
2641 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP)) {
2642 ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of "
2643 "unsupported optional features (%x)",
2644 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
2645 ~EXT4_FEATURE_RO_COMPAT_SUPP));
2646 return 0;
2647 }
2648 /*
2649 * Large file size enabled file system can only be mounted
2650 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
2651 */
2652 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) {
2653 if (sizeof(blkcnt_t) < sizeof(u64)) {
2654 ext4_msg(sb, KERN_ERR, "Filesystem with huge files "
2655 "cannot be mounted RDWR without "
2656 "CONFIG_LBDAF");
2657 return 0;
2658 }
2659 }
2660 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_BIGALLOC) &&
2661 !EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS)) {
2662 ext4_msg(sb, KERN_ERR,
2663 "Can't support bigalloc feature without "
2664 "extents feature\n");
2665 return 0;
2666 }
2667
2668 #ifndef CONFIG_QUOTA
2669 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) &&
2670 !readonly) {
2671 ext4_msg(sb, KERN_ERR,
2672 "Filesystem with quota feature cannot be mounted RDWR "
2673 "without CONFIG_QUOTA");
2674 return 0;
2675 }
2676 #endif /* CONFIG_QUOTA */
2677 return 1;
2678 }
2679
2680 /*
2681 * This function is called once a day if we have errors logged
2682 * on the file system
2683 */
2684 static void print_daily_error_info(unsigned long arg)
2685 {
2686 struct super_block *sb = (struct super_block *) arg;
2687 struct ext4_sb_info *sbi;
2688 struct ext4_super_block *es;
2689
2690 sbi = EXT4_SB(sb);
2691 es = sbi->s_es;
2692
2693 if (es->s_error_count)
2694 /* fsck newer than v1.41.13 is needed to clean this condition. */
2695 ext4_msg(sb, KERN_NOTICE, "error count since last fsck: %u",
2696 le32_to_cpu(es->s_error_count));
2697 if (es->s_first_error_time) {
2698 printk(KERN_NOTICE "EXT4-fs (%s): initial error at time %u: %.*s:%d",
2699 sb->s_id, le32_to_cpu(es->s_first_error_time),
2700 (int) sizeof(es->s_first_error_func),
2701 es->s_first_error_func,
2702 le32_to_cpu(es->s_first_error_line));
2703 if (es->s_first_error_ino)
2704 printk(": inode %u",
2705 le32_to_cpu(es->s_first_error_ino));
2706 if (es->s_first_error_block)
2707 printk(": block %llu", (unsigned long long)
2708 le64_to_cpu(es->s_first_error_block));
2709 printk("\n");
2710 }
2711 if (es->s_last_error_time) {
2712 printk(KERN_NOTICE "EXT4-fs (%s): last error at time %u: %.*s:%d",
2713 sb->s_id, le32_to_cpu(es->s_last_error_time),
2714 (int) sizeof(es->s_last_error_func),
2715 es->s_last_error_func,
2716 le32_to_cpu(es->s_last_error_line));
2717 if (es->s_last_error_ino)
2718 printk(": inode %u",
2719 le32_to_cpu(es->s_last_error_ino));
2720 if (es->s_last_error_block)
2721 printk(": block %llu", (unsigned long long)
2722 le64_to_cpu(es->s_last_error_block));
2723 printk("\n");
2724 }
2725 mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ); /* Once a day */
2726 }
2727
2728 /* Find next suitable group and run ext4_init_inode_table */
2729 static int ext4_run_li_request(struct ext4_li_request *elr)
2730 {
2731 struct ext4_group_desc *gdp = NULL;
2732 ext4_group_t group, ngroups;
2733 struct super_block *sb;
2734 unsigned long timeout = 0;
2735 int ret = 0;
2736
2737 sb = elr->lr_super;
2738 ngroups = EXT4_SB(sb)->s_groups_count;
2739
2740 sb_start_write(sb);
2741 for (group = elr->lr_next_group; group < ngroups; group++) {
2742 gdp = ext4_get_group_desc(sb, group, NULL);
2743 if (!gdp) {
2744 ret = 1;
2745 break;
2746 }
2747
2748 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2749 break;
2750 }
2751
2752 if (group >= ngroups)
2753 ret = 1;
2754
2755 if (!ret) {
2756 timeout = jiffies;
2757 ret = ext4_init_inode_table(sb, group,
2758 elr->lr_timeout ? 0 : 1);
2759 if (elr->lr_timeout == 0) {
2760 timeout = (jiffies - timeout) *
2761 elr->lr_sbi->s_li_wait_mult;
2762 elr->lr_timeout = timeout;
2763 }
2764 elr->lr_next_sched = jiffies + elr->lr_timeout;
2765 elr->lr_next_group = group + 1;
2766 }
2767 sb_end_write(sb);
2768
2769 return ret;
2770 }
2771
2772 /*
2773 * Remove lr_request from the list_request and free the
2774 * request structure. Should be called with li_list_mtx held
2775 */
2776 static void ext4_remove_li_request(struct ext4_li_request *elr)
2777 {
2778 struct ext4_sb_info *sbi;
2779
2780 if (!elr)
2781 return;
2782
2783 sbi = elr->lr_sbi;
2784
2785 list_del(&elr->lr_request);
2786 sbi->s_li_request = NULL;
2787 kfree(elr);
2788 }
2789
2790 static void ext4_unregister_li_request(struct super_block *sb)
2791 {
2792 mutex_lock(&ext4_li_mtx);
2793 if (!ext4_li_info) {
2794 mutex_unlock(&ext4_li_mtx);
2795 return;
2796 }
2797
2798 mutex_lock(&ext4_li_info->li_list_mtx);
2799 ext4_remove_li_request(EXT4_SB(sb)->s_li_request);
2800 mutex_unlock(&ext4_li_info->li_list_mtx);
2801 mutex_unlock(&ext4_li_mtx);
2802 }
2803
2804 static struct task_struct *ext4_lazyinit_task;
2805
2806 /*
2807 * This is the function where ext4lazyinit thread lives. It walks
2808 * through the request list searching for next scheduled filesystem.
2809 * When such a fs is found, run the lazy initialization request
2810 * (ext4_rn_li_request) and keep track of the time spend in this
2811 * function. Based on that time we compute next schedule time of
2812 * the request. When walking through the list is complete, compute
2813 * next waking time and put itself into sleep.
2814 */
2815 static int ext4_lazyinit_thread(void *arg)
2816 {
2817 struct ext4_lazy_init *eli = (struct ext4_lazy_init *)arg;
2818 struct list_head *pos, *n;
2819 struct ext4_li_request *elr;
2820 unsigned long next_wakeup, cur;
2821
2822 BUG_ON(NULL == eli);
2823 set_freezable();
2824
2825 cont_thread:
2826 while (true) {
2827 next_wakeup = MAX_JIFFY_OFFSET;
2828
2829 mutex_lock(&eli->li_list_mtx);
2830 if (list_empty(&eli->li_request_list)) {
2831 mutex_unlock(&eli->li_list_mtx);
2832 goto exit_thread;
2833 }
2834
2835 list_for_each_safe(pos, n, &eli->li_request_list) {
2836 elr = list_entry(pos, struct ext4_li_request,
2837 lr_request);
2838
2839 if (time_after_eq(jiffies, elr->lr_next_sched)) {
2840 if (ext4_run_li_request(elr) != 0) {
2841 /* error, remove the lazy_init job */
2842 ext4_remove_li_request(elr);
2843 continue;
2844 }
2845 }
2846
2847 if (time_before(elr->lr_next_sched, next_wakeup))
2848 next_wakeup = elr->lr_next_sched;
2849 }
2850 mutex_unlock(&eli->li_list_mtx);
2851
2852 try_to_freeze();
2853
2854 cur = jiffies;
2855 if ((time_after_eq(cur, next_wakeup)) ||
2856 (MAX_JIFFY_OFFSET == next_wakeup)) {
2857 cond_resched();
2858 continue;
2859 }
2860
2861 schedule_timeout_interruptible(next_wakeup - cur);
2862
2863 if (kthread_freezable_should_stop(NULL)) {
2864 ext4_clear_request_list();
2865 goto exit_thread;
2866 }
2867 }
2868
2869 exit_thread:
2870 /*
2871 * It looks like the request list is empty, but we need
2872 * to check it under the li_list_mtx lock, to prevent any
2873 * additions into it, and of course we should lock ext4_li_mtx
2874 * to atomically free the list and ext4_li_info, because at
2875 * this point another ext4 filesystem could be registering
2876 * new one.
2877 */
2878 mutex_lock(&ext4_li_mtx);
2879 mutex_lock(&eli->li_list_mtx);
2880 if (!list_empty(&eli->li_request_list)) {
2881 mutex_unlock(&eli->li_list_mtx);
2882 mutex_unlock(&ext4_li_mtx);
2883 goto cont_thread;
2884 }
2885 mutex_unlock(&eli->li_list_mtx);
2886 kfree(ext4_li_info);
2887 ext4_li_info = NULL;
2888 mutex_unlock(&ext4_li_mtx);
2889
2890 return 0;
2891 }
2892
2893 static void ext4_clear_request_list(void)
2894 {
2895 struct list_head *pos, *n;
2896 struct ext4_li_request *elr;
2897
2898 mutex_lock(&ext4_li_info->li_list_mtx);
2899 list_for_each_safe(pos, n, &ext4_li_info->li_request_list) {
2900 elr = list_entry(pos, struct ext4_li_request,
2901 lr_request);
2902 ext4_remove_li_request(elr);
2903 }
2904 mutex_unlock(&ext4_li_info->li_list_mtx);
2905 }
2906
2907 static int ext4_run_lazyinit_thread(void)
2908 {
2909 ext4_lazyinit_task = kthread_run(ext4_lazyinit_thread,
2910 ext4_li_info, "ext4lazyinit");
2911 if (IS_ERR(ext4_lazyinit_task)) {
2912 int err = PTR_ERR(ext4_lazyinit_task);
2913 ext4_clear_request_list();
2914 kfree(ext4_li_info);
2915 ext4_li_info = NULL;
2916 printk(KERN_CRIT "EXT4-fs: error %d creating inode table "
2917 "initialization thread\n",
2918 err);
2919 return err;
2920 }
2921 ext4_li_info->li_state |= EXT4_LAZYINIT_RUNNING;
2922 return 0;
2923 }
2924
2925 /*
2926 * Check whether it make sense to run itable init. thread or not.
2927 * If there is at least one uninitialized inode table, return
2928 * corresponding group number, else the loop goes through all
2929 * groups and return total number of groups.
2930 */
2931 static ext4_group_t ext4_has_uninit_itable(struct super_block *sb)
2932 {
2933 ext4_group_t group, ngroups = EXT4_SB(sb)->s_groups_count;
2934 struct ext4_group_desc *gdp = NULL;
2935
2936 for (group = 0; group < ngroups; group++) {
2937 gdp = ext4_get_group_desc(sb, group, NULL);
2938 if (!gdp)
2939 continue;
2940
2941 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2942 break;
2943 }
2944
2945 return group;
2946 }
2947
2948 static int ext4_li_info_new(void)
2949 {
2950 struct ext4_lazy_init *eli = NULL;
2951
2952 eli = kzalloc(sizeof(*eli), GFP_KERNEL);
2953 if (!eli)
2954 return -ENOMEM;
2955
2956 INIT_LIST_HEAD(&eli->li_request_list);
2957 mutex_init(&eli->li_list_mtx);
2958
2959 eli->li_state |= EXT4_LAZYINIT_QUIT;
2960
2961 ext4_li_info = eli;
2962
2963 return 0;
2964 }
2965
2966 static struct ext4_li_request *ext4_li_request_new(struct super_block *sb,
2967 ext4_group_t start)
2968 {
2969 struct ext4_sb_info *sbi = EXT4_SB(sb);
2970 struct ext4_li_request *elr;
2971 unsigned long rnd;
2972
2973 elr = kzalloc(sizeof(*elr), GFP_KERNEL);
2974 if (!elr)
2975 return NULL;
2976
2977 elr->lr_super = sb;
2978 elr->lr_sbi = sbi;
2979 elr->lr_next_group = start;
2980
2981 /*
2982 * Randomize first schedule time of the request to
2983 * spread the inode table initialization requests
2984 * better.
2985 */
2986 get_random_bytes(&rnd, sizeof(rnd));
2987 elr->lr_next_sched = jiffies + (unsigned long)rnd %
2988 (EXT4_DEF_LI_MAX_START_DELAY * HZ);
2989
2990 return elr;
2991 }
2992
2993 int ext4_register_li_request(struct super_block *sb,
2994 ext4_group_t first_not_zeroed)
2995 {
2996 struct ext4_sb_info *sbi = EXT4_SB(sb);
2997 struct ext4_li_request *elr = NULL;
2998 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
2999 int ret = 0;
3000
3001 mutex_lock(&ext4_li_mtx);
3002 if (sbi->s_li_request != NULL) {
3003 /*
3004 * Reset timeout so it can be computed again, because
3005 * s_li_wait_mult might have changed.
3006 */
3007 sbi->s_li_request->lr_timeout = 0;
3008 goto out;
3009 }
3010
3011 if (first_not_zeroed == ngroups ||
3012 (sb->s_flags & MS_RDONLY) ||
3013 !test_opt(sb, INIT_INODE_TABLE))
3014 goto out;
3015
3016 elr = ext4_li_request_new(sb, first_not_zeroed);
3017 if (!elr) {
3018 ret = -ENOMEM;
3019 goto out;
3020 }
3021
3022 if (NULL == ext4_li_info) {
3023 ret = ext4_li_info_new();
3024 if (ret)
3025 goto out;
3026 }
3027
3028 mutex_lock(&ext4_li_info->li_list_mtx);
3029 list_add(&elr->lr_request, &ext4_li_info->li_request_list);
3030 mutex_unlock(&ext4_li_info->li_list_mtx);
3031
3032 sbi->s_li_request = elr;
3033 /*
3034 * set elr to NULL here since it has been inserted to
3035 * the request_list and the removal and free of it is
3036 * handled by ext4_clear_request_list from now on.
3037 */
3038 elr = NULL;
3039
3040 if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) {
3041 ret = ext4_run_lazyinit_thread();
3042 if (ret)
3043 goto out;
3044 }
3045 out:
3046 mutex_unlock(&ext4_li_mtx);
3047 if (ret)
3048 kfree(elr);
3049 return ret;
3050 }
3051
3052 /*
3053 * We do not need to lock anything since this is called on
3054 * module unload.
3055 */
3056 static void ext4_destroy_lazyinit_thread(void)
3057 {
3058 /*
3059 * If thread exited earlier
3060 * there's nothing to be done.
3061 */
3062 if (!ext4_li_info || !ext4_lazyinit_task)
3063 return;
3064
3065 kthread_stop(ext4_lazyinit_task);
3066 }
3067
3068 static int set_journal_csum_feature_set(struct super_block *sb)
3069 {
3070 int ret = 1;
3071 int compat, incompat;
3072 struct ext4_sb_info *sbi = EXT4_SB(sb);
3073
3074 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3075 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) {
3076 /* journal checksum v2 */
3077 compat = 0;
3078 incompat = JBD2_FEATURE_INCOMPAT_CSUM_V2;
3079 } else {
3080 /* journal checksum v1 */
3081 compat = JBD2_FEATURE_COMPAT_CHECKSUM;
3082 incompat = 0;
3083 }
3084
3085 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
3086 ret = jbd2_journal_set_features(sbi->s_journal,
3087 compat, 0,
3088 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT |
3089 incompat);
3090 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
3091 ret = jbd2_journal_set_features(sbi->s_journal,
3092 compat, 0,
3093 incompat);
3094 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
3095 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
3096 } else {
3097 jbd2_journal_clear_features(sbi->s_journal,
3098 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
3099 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT |
3100 JBD2_FEATURE_INCOMPAT_CSUM_V2);
3101 }
3102
3103 return ret;
3104 }
3105
3106 /*
3107 * Note: calculating the overhead so we can be compatible with
3108 * historical BSD practice is quite difficult in the face of
3109 * clusters/bigalloc. This is because multiple metadata blocks from
3110 * different block group can end up in the same allocation cluster.
3111 * Calculating the exact overhead in the face of clustered allocation
3112 * requires either O(all block bitmaps) in memory or O(number of block
3113 * groups**2) in time. We will still calculate the superblock for
3114 * older file systems --- and if we come across with a bigalloc file
3115 * system with zero in s_overhead_clusters the estimate will be close to
3116 * correct especially for very large cluster sizes --- but for newer
3117 * file systems, it's better to calculate this figure once at mkfs
3118 * time, and store it in the superblock. If the superblock value is
3119 * present (even for non-bigalloc file systems), we will use it.
3120 */
3121 static int count_overhead(struct super_block *sb, ext4_group_t grp,
3122 char *buf)
3123 {
3124 struct ext4_sb_info *sbi = EXT4_SB(sb);
3125 struct ext4_group_desc *gdp;
3126 ext4_fsblk_t first_block, last_block, b;
3127 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3128 int s, j, count = 0;
3129
3130 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_BIGALLOC))
3131 return (ext4_bg_has_super(sb, grp) + ext4_bg_num_gdb(sb, grp) +
3132 sbi->s_itb_per_group + 2);
3133
3134 first_block = le32_to_cpu(sbi->s_es->s_first_data_block) +
3135 (grp * EXT4_BLOCKS_PER_GROUP(sb));
3136 last_block = first_block + EXT4_BLOCKS_PER_GROUP(sb) - 1;
3137 for (i = 0; i < ngroups; i++) {
3138 gdp = ext4_get_group_desc(sb, i, NULL);
3139 b = ext4_block_bitmap(sb, gdp);
3140 if (b >= first_block && b <= last_block) {
3141 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3142 count++;
3143 }
3144 b = ext4_inode_bitmap(sb, gdp);
3145 if (b >= first_block && b <= last_block) {
3146 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3147 count++;
3148 }
3149 b = ext4_inode_table(sb, gdp);
3150 if (b >= first_block && b + sbi->s_itb_per_group <= last_block)
3151 for (j = 0; j < sbi->s_itb_per_group; j++, b++) {
3152 int c = EXT4_B2C(sbi, b - first_block);
3153 ext4_set_bit(c, buf);
3154 count++;
3155 }
3156 if (i != grp)
3157 continue;
3158 s = 0;
3159 if (ext4_bg_has_super(sb, grp)) {
3160 ext4_set_bit(s++, buf);
3161 count++;
3162 }
3163 for (j = ext4_bg_num_gdb(sb, grp); j > 0; j--) {
3164 ext4_set_bit(EXT4_B2C(sbi, s++), buf);
3165 count++;
3166 }
3167 }
3168 if (!count)
3169 return 0;
3170 return EXT4_CLUSTERS_PER_GROUP(sb) -
3171 ext4_count_free(buf, EXT4_CLUSTERS_PER_GROUP(sb) / 8);
3172 }
3173
3174 /*
3175 * Compute the overhead and stash it in sbi->s_overhead
3176 */
3177 int ext4_calculate_overhead(struct super_block *sb)
3178 {
3179 struct ext4_sb_info *sbi = EXT4_SB(sb);
3180 struct ext4_super_block *es = sbi->s_es;
3181 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3182 ext4_fsblk_t overhead = 0;
3183 char *buf = (char *) get_zeroed_page(GFP_KERNEL);
3184
3185 if (!buf)
3186 return -ENOMEM;
3187
3188 /*
3189 * Compute the overhead (FS structures). This is constant
3190 * for a given filesystem unless the number of block groups
3191 * changes so we cache the previous value until it does.
3192 */
3193
3194 /*
3195 * All of the blocks before first_data_block are overhead
3196 */
3197 overhead = EXT4_B2C(sbi, le32_to_cpu(es->s_first_data_block));
3198
3199 /*
3200 * Add the overhead found in each block group
3201 */
3202 for (i = 0; i < ngroups; i++) {
3203 int blks;
3204
3205 blks = count_overhead(sb, i, buf);
3206 overhead += blks;
3207 if (blks)
3208 memset(buf, 0, PAGE_SIZE);
3209 cond_resched();
3210 }
3211 /* Add the journal blocks as well */
3212 if (sbi->s_journal)
3213 overhead += EXT4_NUM_B2C(sbi, sbi->s_journal->j_maxlen);
3214
3215 sbi->s_overhead = overhead;
3216 smp_wmb();
3217 free_page((unsigned long) buf);
3218 return 0;
3219 }
3220
3221
3222 static ext4_fsblk_t ext4_calculate_resv_clusters(struct super_block *sb)
3223 {
3224 ext4_fsblk_t resv_clusters;
3225
3226 /*
3227 * There's no need to reserve anything when we aren't using extents.
3228 * The space estimates are exact, there are no unwritten extents,
3229 * hole punching doesn't need new metadata... This is needed especially
3230 * to keep ext2/3 backward compatibility.
3231 */
3232 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS))
3233 return 0;
3234 /*
3235 * By default we reserve 2% or 4096 clusters, whichever is smaller.
3236 * This should cover the situations where we can not afford to run
3237 * out of space like for example punch hole, or converting
3238 * uninitialized extents in delalloc path. In most cases such
3239 * allocation would require 1, or 2 blocks, higher numbers are
3240 * very rare.
3241 */
3242 resv_clusters = ext4_blocks_count(EXT4_SB(sb)->s_es) >>
3243 EXT4_SB(sb)->s_cluster_bits;
3244
3245 do_div(resv_clusters, 50);
3246 resv_clusters = min_t(ext4_fsblk_t, resv_clusters, 4096);
3247
3248 return resv_clusters;
3249 }
3250
3251
3252 static int ext4_reserve_clusters(struct ext4_sb_info *sbi, ext4_fsblk_t count)
3253 {
3254 ext4_fsblk_t clusters = ext4_blocks_count(sbi->s_es) >>
3255 sbi->s_cluster_bits;
3256
3257 if (count >= clusters)
3258 return -EINVAL;
3259
3260 atomic64_set(&sbi->s_resv_clusters, count);
3261 return 0;
3262 }
3263
3264 static int ext4_fill_super(struct super_block *sb, void *data, int silent)
3265 {
3266 char *orig_data = kstrdup(data, GFP_KERNEL);
3267 struct buffer_head *bh;
3268 struct ext4_super_block *es = NULL;
3269 struct ext4_sb_info *sbi;
3270 ext4_fsblk_t block;
3271 ext4_fsblk_t sb_block = get_sb_block(&data);
3272 ext4_fsblk_t logical_sb_block;
3273 unsigned long offset = 0;
3274 unsigned long journal_devnum = 0;
3275 unsigned long def_mount_opts;
3276 struct inode *root;
3277 char *cp;
3278 const char *descr;
3279 int ret = -ENOMEM;
3280 int blocksize, clustersize;
3281 unsigned int db_count;
3282 unsigned int i;
3283 int needs_recovery, has_huge_files, has_bigalloc;
3284 __u64 blocks_count;
3285 int err = 0;
3286 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
3287 ext4_group_t first_not_zeroed;
3288
3289 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
3290 if (!sbi)
3291 goto out_free_orig;
3292
3293 sbi->s_blockgroup_lock =
3294 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
3295 if (!sbi->s_blockgroup_lock) {
3296 kfree(sbi);
3297 goto out_free_orig;
3298 }
3299 sb->s_fs_info = sbi;
3300 sbi->s_sb = sb;
3301 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
3302 sbi->s_sb_block = sb_block;
3303 if (sb->s_bdev->bd_part)
3304 sbi->s_sectors_written_start =
3305 part_stat_read(sb->s_bdev->bd_part, sectors[1]);
3306
3307 /* Cleanup superblock name */
3308 for (cp = sb->s_id; (cp = strchr(cp, '/'));)
3309 *cp = '!';
3310
3311 /* -EINVAL is default */
3312 ret = -EINVAL;
3313 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
3314 if (!blocksize) {
3315 ext4_msg(sb, KERN_ERR, "unable to set blocksize");
3316 goto out_fail;
3317 }
3318
3319 /*
3320 * The ext4 superblock will not be buffer aligned for other than 1kB
3321 * block sizes. We need to calculate the offset from buffer start.
3322 */
3323 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
3324 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3325 offset = do_div(logical_sb_block, blocksize);
3326 } else {
3327 logical_sb_block = sb_block;
3328 }
3329
3330 if (!(bh = sb_bread(sb, logical_sb_block))) {
3331 ext4_msg(sb, KERN_ERR, "unable to read superblock");
3332 goto out_fail;
3333 }
3334 /*
3335 * Note: s_es must be initialized as soon as possible because
3336 * some ext4 macro-instructions depend on its value
3337 */
3338 es = (struct ext4_super_block *) (bh->b_data + offset);
3339 sbi->s_es = es;
3340 sb->s_magic = le16_to_cpu(es->s_magic);
3341 if (sb->s_magic != EXT4_SUPER_MAGIC)
3342 goto cantfind_ext4;
3343 sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
3344
3345 /* Warn if metadata_csum and gdt_csum are both set. */
3346 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3347 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) &&
3348 EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_GDT_CSUM))
3349 ext4_warning(sb, KERN_INFO "metadata_csum and uninit_bg are "
3350 "redundant flags; please run fsck.");
3351
3352 /* Check for a known checksum algorithm */
3353 if (!ext4_verify_csum_type(sb, es)) {
3354 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3355 "unknown checksum algorithm.");
3356 silent = 1;
3357 goto cantfind_ext4;
3358 }
3359
3360 /* Load the checksum driver */
3361 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3362 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) {
3363 sbi->s_chksum_driver = crypto_alloc_shash("crc32c", 0, 0);
3364 if (IS_ERR(sbi->s_chksum_driver)) {
3365 ext4_msg(sb, KERN_ERR, "Cannot load crc32c driver.");
3366 ret = PTR_ERR(sbi->s_chksum_driver);
3367 sbi->s_chksum_driver = NULL;
3368 goto failed_mount;
3369 }
3370 }
3371
3372 /* Check superblock checksum */
3373 if (!ext4_superblock_csum_verify(sb, es)) {
3374 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3375 "invalid superblock checksum. Run e2fsck?");
3376 silent = 1;
3377 goto cantfind_ext4;
3378 }
3379
3380 /* Precompute checksum seed for all metadata */
3381 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3382 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
3383 sbi->s_csum_seed = ext4_chksum(sbi, ~0, es->s_uuid,
3384 sizeof(es->s_uuid));
3385
3386 /* Set defaults before we parse the mount options */
3387 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
3388 set_opt(sb, INIT_INODE_TABLE);
3389 if (def_mount_opts & EXT4_DEFM_DEBUG)
3390 set_opt(sb, DEBUG);
3391 if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
3392 set_opt(sb, GRPID);
3393 if (def_mount_opts & EXT4_DEFM_UID16)
3394 set_opt(sb, NO_UID32);
3395 /* xattr user namespace & acls are now defaulted on */
3396 set_opt(sb, XATTR_USER);
3397 #ifdef CONFIG_EXT4_FS_POSIX_ACL
3398 set_opt(sb, POSIX_ACL);
3399 #endif
3400 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
3401 set_opt(sb, JOURNAL_DATA);
3402 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
3403 set_opt(sb, ORDERED_DATA);
3404 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
3405 set_opt(sb, WRITEBACK_DATA);
3406
3407 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
3408 set_opt(sb, ERRORS_PANIC);
3409 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
3410 set_opt(sb, ERRORS_CONT);
3411 else
3412 set_opt(sb, ERRORS_RO);
3413 if (def_mount_opts & EXT4_DEFM_BLOCK_VALIDITY)
3414 set_opt(sb, BLOCK_VALIDITY);
3415 if (def_mount_opts & EXT4_DEFM_DISCARD)
3416 set_opt(sb, DISCARD);
3417
3418 sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));
3419 sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid));
3420 sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
3421 sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
3422 sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
3423
3424 if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0)
3425 set_opt(sb, BARRIER);
3426
3427 /*
3428 * enable delayed allocation by default
3429 * Use -o nodelalloc to turn it off
3430 */
3431 if (!IS_EXT3_SB(sb) && !IS_EXT2_SB(sb) &&
3432 ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0))
3433 set_opt(sb, DELALLOC);
3434
3435 /*
3436 * set default s_li_wait_mult for lazyinit, for the case there is
3437 * no mount option specified.
3438 */
3439 sbi->s_li_wait_mult = EXT4_DEF_LI_WAIT_MULT;
3440
3441 if (!parse_options((char *) sbi->s_es->s_mount_opts, sb,
3442 &journal_devnum, &journal_ioprio, 0)) {
3443 ext4_msg(sb, KERN_WARNING,
3444 "failed to parse options in superblock: %s",
3445 sbi->s_es->s_mount_opts);
3446 }
3447 sbi->s_def_mount_opt = sbi->s_mount_opt;
3448 if (!parse_options((char *) data, sb, &journal_devnum,
3449 &journal_ioprio, 0))
3450 goto failed_mount;
3451
3452 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
3453 printk_once(KERN_WARNING "EXT4-fs: Warning: mounting "
3454 "with data=journal disables delayed "
3455 "allocation and O_DIRECT support!\n");
3456 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
3457 ext4_msg(sb, KERN_ERR, "can't mount with "
3458 "both data=journal and delalloc");
3459 goto failed_mount;
3460 }
3461 if (test_opt(sb, DIOREAD_NOLOCK)) {
3462 ext4_msg(sb, KERN_ERR, "can't mount with "
3463 "both data=journal and dioread_nolock");
3464 goto failed_mount;
3465 }
3466 if (test_opt(sb, DELALLOC))
3467 clear_opt(sb, DELALLOC);
3468 }
3469
3470 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
3471 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
3472
3473 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
3474 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
3475 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
3476 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
3477 ext4_msg(sb, KERN_WARNING,
3478 "feature flags set on rev 0 fs, "
3479 "running e2fsck is recommended");
3480
3481 if (IS_EXT2_SB(sb)) {
3482 if (ext2_feature_set_ok(sb))
3483 ext4_msg(sb, KERN_INFO, "mounting ext2 file system "
3484 "using the ext4 subsystem");
3485 else {
3486 ext4_msg(sb, KERN_ERR, "couldn't mount as ext2 due "
3487 "to feature incompatibilities");
3488 goto failed_mount;
3489 }
3490 }
3491
3492 if (IS_EXT3_SB(sb)) {
3493 if (ext3_feature_set_ok(sb))
3494 ext4_msg(sb, KERN_INFO, "mounting ext3 file system "
3495 "using the ext4 subsystem");
3496 else {
3497 ext4_msg(sb, KERN_ERR, "couldn't mount as ext3 due "
3498 "to feature incompatibilities");
3499 goto failed_mount;
3500 }
3501 }
3502
3503 /*
3504 * Check feature flags regardless of the revision level, since we
3505 * previously didn't change the revision level when setting the flags,
3506 * so there is a chance incompat flags are set on a rev 0 filesystem.
3507 */
3508 if (!ext4_feature_set_ok(sb, (sb->s_flags & MS_RDONLY)))
3509 goto failed_mount;
3510
3511 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
3512 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
3513 blocksize > EXT4_MAX_BLOCK_SIZE) {
3514 ext4_msg(sb, KERN_ERR,
3515 "Unsupported filesystem blocksize %d", blocksize);
3516 goto failed_mount;
3517 }
3518
3519 if (sb->s_blocksize != blocksize) {
3520 /* Validate the filesystem blocksize */
3521 if (!sb_set_blocksize(sb, blocksize)) {
3522 ext4_msg(sb, KERN_ERR, "bad block size %d",
3523 blocksize);
3524 goto failed_mount;
3525 }
3526
3527 brelse(bh);
3528 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3529 offset = do_div(logical_sb_block, blocksize);
3530 bh = sb_bread(sb, logical_sb_block);
3531 if (!bh) {
3532 ext4_msg(sb, KERN_ERR,
3533 "Can't read superblock on 2nd try");
3534 goto failed_mount;
3535 }
3536 es = (struct ext4_super_block *)(bh->b_data + offset);
3537 sbi->s_es = es;
3538 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
3539 ext4_msg(sb, KERN_ERR,
3540 "Magic mismatch, very weird!");
3541 goto failed_mount;
3542 }
3543 }
3544
3545 has_huge_files = EXT4_HAS_RO_COMPAT_FEATURE(sb,
3546 EXT4_FEATURE_RO_COMPAT_HUGE_FILE);
3547 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
3548 has_huge_files);
3549 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
3550
3551 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
3552 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
3553 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
3554 } else {
3555 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
3556 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
3557 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
3558 (!is_power_of_2(sbi->s_inode_size)) ||
3559 (sbi->s_inode_size > blocksize)) {
3560 ext4_msg(sb, KERN_ERR,
3561 "unsupported inode size: %d",
3562 sbi->s_inode_size);
3563 goto failed_mount;
3564 }
3565 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
3566 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
3567 }
3568
3569 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
3570 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
3571 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
3572 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
3573 !is_power_of_2(sbi->s_desc_size)) {
3574 ext4_msg(sb, KERN_ERR,
3575 "unsupported descriptor size %lu",
3576 sbi->s_desc_size);
3577 goto failed_mount;
3578 }
3579 } else
3580 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
3581
3582 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
3583 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
3584 if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
3585 goto cantfind_ext4;
3586
3587 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
3588 if (sbi->s_inodes_per_block == 0)
3589 goto cantfind_ext4;
3590 sbi->s_itb_per_group = sbi->s_inodes_per_group /
3591 sbi->s_inodes_per_block;
3592 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
3593 sbi->s_sbh = bh;
3594 sbi->s_mount_state = le16_to_cpu(es->s_state);
3595 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
3596 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
3597
3598 for (i = 0; i < 4; i++)
3599 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
3600 sbi->s_def_hash_version = es->s_def_hash_version;
3601 if (EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_DIR_INDEX)) {
3602 i = le32_to_cpu(es->s_flags);
3603 if (i & EXT2_FLAGS_UNSIGNED_HASH)
3604 sbi->s_hash_unsigned = 3;
3605 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
3606 #ifdef __CHAR_UNSIGNED__
3607 if (!(sb->s_flags & MS_RDONLY))
3608 es->s_flags |=
3609 cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
3610 sbi->s_hash_unsigned = 3;
3611 #else
3612 if (!(sb->s_flags & MS_RDONLY))
3613 es->s_flags |=
3614 cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
3615 #endif
3616 }
3617 }
3618
3619 /* Handle clustersize */
3620 clustersize = BLOCK_SIZE << le32_to_cpu(es->s_log_cluster_size);
3621 has_bigalloc = EXT4_HAS_RO_COMPAT_FEATURE(sb,
3622 EXT4_FEATURE_RO_COMPAT_BIGALLOC);
3623 if (has_bigalloc) {
3624 if (clustersize < blocksize) {
3625 ext4_msg(sb, KERN_ERR,
3626 "cluster size (%d) smaller than "
3627 "block size (%d)", clustersize, blocksize);
3628 goto failed_mount;
3629 }
3630 sbi->s_cluster_bits = le32_to_cpu(es->s_log_cluster_size) -
3631 le32_to_cpu(es->s_log_block_size);
3632 sbi->s_clusters_per_group =
3633 le32_to_cpu(es->s_clusters_per_group);
3634 if (sbi->s_clusters_per_group > blocksize * 8) {
3635 ext4_msg(sb, KERN_ERR,
3636 "#clusters per group too big: %lu",
3637 sbi->s_clusters_per_group);
3638 goto failed_mount;
3639 }
3640 if (sbi->s_blocks_per_group !=
3641 (sbi->s_clusters_per_group * (clustersize / blocksize))) {
3642 ext4_msg(sb, KERN_ERR, "blocks per group (%lu) and "
3643 "clusters per group (%lu) inconsistent",
3644 sbi->s_blocks_per_group,
3645 sbi->s_clusters_per_group);
3646 goto failed_mount;
3647 }
3648 } else {
3649 if (clustersize != blocksize) {
3650 ext4_warning(sb, "fragment/cluster size (%d) != "
3651 "block size (%d)", clustersize,
3652 blocksize);
3653 clustersize = blocksize;
3654 }
3655 if (sbi->s_blocks_per_group > blocksize * 8) {
3656 ext4_msg(sb, KERN_ERR,
3657 "#blocks per group too big: %lu",
3658 sbi->s_blocks_per_group);
3659 goto failed_mount;
3660 }
3661 sbi->s_clusters_per_group = sbi->s_blocks_per_group;
3662 sbi->s_cluster_bits = 0;
3663 }
3664 sbi->s_cluster_ratio = clustersize / blocksize;
3665
3666 if (sbi->s_inodes_per_group > blocksize * 8) {
3667 ext4_msg(sb, KERN_ERR,
3668 "#inodes per group too big: %lu",
3669 sbi->s_inodes_per_group);
3670 goto failed_mount;
3671 }
3672
3673 /* Do we have standard group size of clustersize * 8 blocks ? */
3674 if (sbi->s_blocks_per_group == clustersize << 3)
3675 set_opt2(sb, STD_GROUP_SIZE);
3676
3677 /*
3678 * Test whether we have more sectors than will fit in sector_t,
3679 * and whether the max offset is addressable by the page cache.
3680 */
3681 err = generic_check_addressable(sb->s_blocksize_bits,
3682 ext4_blocks_count(es));
3683 if (err) {
3684 ext4_msg(sb, KERN_ERR, "filesystem"
3685 " too large to mount safely on this system");
3686 if (sizeof(sector_t) < 8)
3687 ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled");
3688 goto failed_mount;
3689 }
3690
3691 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
3692 goto cantfind_ext4;
3693
3694 /* check blocks count against device size */
3695 blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
3696 if (blocks_count && ext4_blocks_count(es) > blocks_count) {
3697 ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
3698 "exceeds size of device (%llu blocks)",
3699 ext4_blocks_count(es), blocks_count);
3700 goto failed_mount;
3701 }
3702
3703 /*
3704 * It makes no sense for the first data block to be beyond the end
3705 * of the filesystem.
3706 */
3707 if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
3708 ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
3709 "block %u is beyond end of filesystem (%llu)",
3710 le32_to_cpu(es->s_first_data_block),
3711 ext4_blocks_count(es));
3712 goto failed_mount;
3713 }
3714 blocks_count = (ext4_blocks_count(es) -
3715 le32_to_cpu(es->s_first_data_block) +
3716 EXT4_BLOCKS_PER_GROUP(sb) - 1);
3717 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
3718 if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
3719 ext4_msg(sb, KERN_WARNING, "groups count too large: %u "
3720 "(block count %llu, first data block %u, "
3721 "blocks per group %lu)", sbi->s_groups_count,
3722 ext4_blocks_count(es),
3723 le32_to_cpu(es->s_first_data_block),
3724 EXT4_BLOCKS_PER_GROUP(sb));
3725 goto failed_mount;
3726 }
3727 sbi->s_groups_count = blocks_count;
3728 sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
3729 (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
3730 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
3731 EXT4_DESC_PER_BLOCK(sb);
3732 sbi->s_group_desc = ext4_kvmalloc(db_count *
3733 sizeof(struct buffer_head *),
3734 GFP_KERNEL);
3735 if (sbi->s_group_desc == NULL) {
3736 ext4_msg(sb, KERN_ERR, "not enough memory");
3737 ret = -ENOMEM;
3738 goto failed_mount;
3739 }
3740
3741 if (ext4_proc_root)
3742 sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);
3743
3744 if (sbi->s_proc)
3745 proc_create_data("options", S_IRUGO, sbi->s_proc,
3746 &ext4_seq_options_fops, sb);
3747
3748 bgl_lock_init(sbi->s_blockgroup_lock);
3749
3750 for (i = 0; i < db_count; i++) {
3751 block = descriptor_loc(sb, logical_sb_block, i);
3752 sbi->s_group_desc[i] = sb_bread(sb, block);
3753 if (!sbi->s_group_desc[i]) {
3754 ext4_msg(sb, KERN_ERR,
3755 "can't read group descriptor %d", i);
3756 db_count = i;
3757 goto failed_mount2;
3758 }
3759 }
3760 if (!ext4_check_descriptors(sb, &first_not_zeroed)) {
3761 ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
3762 goto failed_mount2;
3763 }
3764 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
3765 if (!ext4_fill_flex_info(sb)) {
3766 ext4_msg(sb, KERN_ERR,
3767 "unable to initialize "
3768 "flex_bg meta info!");
3769 goto failed_mount2;
3770 }
3771
3772 sbi->s_gdb_count = db_count;
3773 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
3774 spin_lock_init(&sbi->s_next_gen_lock);
3775
3776 init_timer(&sbi->s_err_report);
3777 sbi->s_err_report.function = print_daily_error_info;
3778 sbi->s_err_report.data = (unsigned long) sb;
3779
3780 /* Register extent status tree shrinker */
3781 ext4_es_register_shrinker(sb);
3782
3783 err = percpu_counter_init(&sbi->s_freeclusters_counter,
3784 ext4_count_free_clusters(sb));
3785 if (!err) {
3786 err = percpu_counter_init(&sbi->s_freeinodes_counter,
3787 ext4_count_free_inodes(sb));
3788 }
3789 if (!err) {
3790 err = percpu_counter_init(&sbi->s_dirs_counter,
3791 ext4_count_dirs(sb));
3792 }
3793 if (!err) {
3794 err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0);
3795 }
3796 if (!err) {
3797 err = percpu_counter_init(&sbi->s_extent_cache_cnt, 0);
3798 }
3799 if (err) {
3800 ext4_msg(sb, KERN_ERR, "insufficient memory");
3801 goto failed_mount3;
3802 }
3803
3804 sbi->s_stripe = ext4_get_stripe_size(sbi);
3805 sbi->s_max_writeback_mb_bump = 128;
3806 sbi->s_extent_max_zeroout_kb = 32;
3807
3808 /*
3809 * set up enough so that it can read an inode
3810 */
3811 if (!test_opt(sb, NOLOAD) &&
3812 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
3813 sb->s_op = &ext4_sops;
3814 else
3815 sb->s_op = &ext4_nojournal_sops;
3816 sb->s_export_op = &ext4_export_ops;
3817 sb->s_xattr = ext4_xattr_handlers;
3818 #ifdef CONFIG_QUOTA
3819 sb->dq_op = &ext4_quota_operations;
3820 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA))
3821 sb->s_qcop = &ext4_qctl_sysfile_operations;
3822 else
3823 sb->s_qcop = &ext4_qctl_operations;
3824 #endif
3825 memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
3826
3827 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
3828 mutex_init(&sbi->s_orphan_lock);
3829
3830 sb->s_root = NULL;
3831
3832 needs_recovery = (es->s_last_orphan != 0 ||
3833 EXT4_HAS_INCOMPAT_FEATURE(sb,
3834 EXT4_FEATURE_INCOMPAT_RECOVER));
3835
3836 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_MMP) &&
3837 !(sb->s_flags & MS_RDONLY))
3838 if (ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block)))
3839 goto failed_mount3;
3840
3841 /*
3842 * The first inode we look at is the journal inode. Don't try
3843 * root first: it may be modified in the journal!
3844 */
3845 if (!test_opt(sb, NOLOAD) &&
3846 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
3847 if (ext4_load_journal(sb, es, journal_devnum))
3848 goto failed_mount3;
3849 } else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) &&
3850 EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
3851 ext4_msg(sb, KERN_ERR, "required journal recovery "
3852 "suppressed and not mounted read-only");
3853 goto failed_mount_wq;
3854 } else {
3855 clear_opt(sb, DATA_FLAGS);
3856 sbi->s_journal = NULL;
3857 needs_recovery = 0;
3858 goto no_journal;
3859 }
3860
3861 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT) &&
3862 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
3863 JBD2_FEATURE_INCOMPAT_64BIT)) {
3864 ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
3865 goto failed_mount_wq;
3866 }
3867
3868 if (!set_journal_csum_feature_set(sb)) {
3869 ext4_msg(sb, KERN_ERR, "Failed to set journal checksum "
3870 "feature set");
3871 goto failed_mount_wq;
3872 }
3873
3874 /* We have now updated the journal if required, so we can
3875 * validate the data journaling mode. */
3876 switch (test_opt(sb, DATA_FLAGS)) {
3877 case 0:
3878 /* No mode set, assume a default based on the journal
3879 * capabilities: ORDERED_DATA if the journal can
3880 * cope, else JOURNAL_DATA
3881 */
3882 if (jbd2_journal_check_available_features
3883 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
3884 set_opt(sb, ORDERED_DATA);
3885 else
3886 set_opt(sb, JOURNAL_DATA);
3887 break;
3888
3889 case EXT4_MOUNT_ORDERED_DATA:
3890 case EXT4_MOUNT_WRITEBACK_DATA:
3891 if (!jbd2_journal_check_available_features
3892 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
3893 ext4_msg(sb, KERN_ERR, "Journal does not support "
3894 "requested data journaling mode");
3895 goto failed_mount_wq;
3896 }
3897 default:
3898 break;
3899 }
3900 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
3901
3902 sbi->s_journal->j_commit_callback = ext4_journal_commit_callback;
3903
3904 /*
3905 * The journal may have updated the bg summary counts, so we
3906 * need to update the global counters.
3907 */
3908 percpu_counter_set(&sbi->s_freeclusters_counter,
3909 ext4_count_free_clusters(sb));
3910 percpu_counter_set(&sbi->s_freeinodes_counter,
3911 ext4_count_free_inodes(sb));
3912 percpu_counter_set(&sbi->s_dirs_counter,
3913 ext4_count_dirs(sb));
3914 percpu_counter_set(&sbi->s_dirtyclusters_counter, 0);
3915
3916 no_journal:
3917 /*
3918 * Get the # of file system overhead blocks from the
3919 * superblock if present.
3920 */
3921 if (es->s_overhead_clusters)
3922 sbi->s_overhead = le32_to_cpu(es->s_overhead_clusters);
3923 else {
3924 err = ext4_calculate_overhead(sb);
3925 if (err)
3926 goto failed_mount_wq;
3927 }
3928
3929 /*
3930 * The maximum number of concurrent works can be high and
3931 * concurrency isn't really necessary. Limit it to 1.
3932 */
3933 EXT4_SB(sb)->dio_unwritten_wq =
3934 alloc_workqueue("ext4-dio-unwritten", WQ_MEM_RECLAIM | WQ_UNBOUND, 1);
3935 if (!EXT4_SB(sb)->dio_unwritten_wq) {
3936 printk(KERN_ERR "EXT4-fs: failed to create DIO workqueue\n");
3937 ret = -ENOMEM;
3938 goto failed_mount_wq;
3939 }
3940
3941 /*
3942 * The jbd2_journal_load will have done any necessary log recovery,
3943 * so we can safely mount the rest of the filesystem now.
3944 */
3945
3946 root = ext4_iget(sb, EXT4_ROOT_INO);
3947 if (IS_ERR(root)) {
3948 ext4_msg(sb, KERN_ERR, "get root inode failed");
3949 ret = PTR_ERR(root);
3950 root = NULL;
3951 goto failed_mount4;
3952 }
3953 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
3954 ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
3955 iput(root);
3956 goto failed_mount4;
3957 }
3958 sb->s_root = d_make_root(root);
3959 if (!sb->s_root) {
3960 ext4_msg(sb, KERN_ERR, "get root dentry failed");
3961 ret = -ENOMEM;
3962 goto failed_mount4;
3963 }
3964
3965 if (ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY))
3966 sb->s_flags |= MS_RDONLY;
3967
3968 /* determine the minimum size of new large inodes, if present */
3969 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
3970 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
3971 EXT4_GOOD_OLD_INODE_SIZE;
3972 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3973 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) {
3974 if (sbi->s_want_extra_isize <
3975 le16_to_cpu(es->s_want_extra_isize))
3976 sbi->s_want_extra_isize =
3977 le16_to_cpu(es->s_want_extra_isize);
3978 if (sbi->s_want_extra_isize <
3979 le16_to_cpu(es->s_min_extra_isize))
3980 sbi->s_want_extra_isize =
3981 le16_to_cpu(es->s_min_extra_isize);
3982 }
3983 }
3984 /* Check if enough inode space is available */
3985 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
3986 sbi->s_inode_size) {
3987 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
3988 EXT4_GOOD_OLD_INODE_SIZE;
3989 ext4_msg(sb, KERN_INFO, "required extra inode space not"
3990 "available");
3991 }
3992
3993 err = ext4_reserve_clusters(sbi, ext4_calculate_resv_clusters(sb));
3994 if (err) {
3995 ext4_msg(sb, KERN_ERR, "failed to reserve %llu clusters for "
3996 "reserved pool", ext4_calculate_resv_clusters(sb));
3997 goto failed_mount4a;
3998 }
3999
4000 err = ext4_setup_system_zone(sb);
4001 if (err) {
4002 ext4_msg(sb, KERN_ERR, "failed to initialize system "
4003 "zone (%d)", err);
4004 goto failed_mount4a;
4005 }
4006
4007 ext4_ext_init(sb);
4008 err = ext4_mb_init(sb);
4009 if (err) {
4010 ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)",
4011 err);
4012 goto failed_mount5;
4013 }
4014
4015 err = ext4_register_li_request(sb, first_not_zeroed);
4016 if (err)
4017 goto failed_mount6;
4018
4019 sbi->s_kobj.kset = ext4_kset;
4020 init_completion(&sbi->s_kobj_unregister);
4021 err = kobject_init_and_add(&sbi->s_kobj, &ext4_ktype, NULL,
4022 "%s", sb->s_id);
4023 if (err)
4024 goto failed_mount7;
4025
4026 #ifdef CONFIG_QUOTA
4027 /* Enable quota usage during mount. */
4028 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) &&
4029 !(sb->s_flags & MS_RDONLY)) {
4030 err = ext4_enable_quotas(sb);
4031 if (err)
4032 goto failed_mount8;
4033 }
4034 #endif /* CONFIG_QUOTA */
4035
4036 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
4037 ext4_orphan_cleanup(sb, es);
4038 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
4039 if (needs_recovery) {
4040 ext4_msg(sb, KERN_INFO, "recovery complete");
4041 ext4_mark_recovery_complete(sb, es);
4042 }
4043 if (EXT4_SB(sb)->s_journal) {
4044 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
4045 descr = " journalled data mode";
4046 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
4047 descr = " ordered data mode";
4048 else
4049 descr = " writeback data mode";
4050 } else
4051 descr = "out journal";
4052
4053 if (test_opt(sb, DISCARD)) {
4054 struct request_queue *q = bdev_get_queue(sb->s_bdev);
4055 if (!blk_queue_discard(q))
4056 ext4_msg(sb, KERN_WARNING,
4057 "mounting with \"discard\" option, but "
4058 "the device does not support discard");
4059 }
4060
4061 ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. "
4062 "Opts: %s%s%s", descr, sbi->s_es->s_mount_opts,
4063 *sbi->s_es->s_mount_opts ? "; " : "", orig_data);
4064
4065 if (es->s_error_count)
4066 mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */
4067
4068 kfree(orig_data);
4069 return 0;
4070
4071 cantfind_ext4:
4072 if (!silent)
4073 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
4074 goto failed_mount;
4075
4076 #ifdef CONFIG_QUOTA
4077 failed_mount8:
4078 kobject_del(&sbi->s_kobj);
4079 #endif
4080 failed_mount7:
4081 ext4_unregister_li_request(sb);
4082 failed_mount6:
4083 ext4_mb_release(sb);
4084 failed_mount5:
4085 ext4_ext_release(sb);
4086 ext4_release_system_zone(sb);
4087 failed_mount4a:
4088 dput(sb->s_root);
4089 sb->s_root = NULL;
4090 failed_mount4:
4091 ext4_msg(sb, KERN_ERR, "mount failed");
4092 destroy_workqueue(EXT4_SB(sb)->dio_unwritten_wq);
4093 failed_mount_wq:
4094 if (sbi->s_journal) {
4095 jbd2_journal_destroy(sbi->s_journal);
4096 sbi->s_journal = NULL;
4097 }
4098 failed_mount3:
4099 ext4_es_unregister_shrinker(sb);
4100 del_timer(&sbi->s_err_report);
4101 if (sbi->s_flex_groups)
4102 ext4_kvfree(sbi->s_flex_groups);
4103 percpu_counter_destroy(&sbi->s_freeclusters_counter);
4104 percpu_counter_destroy(&sbi->s_freeinodes_counter);
4105 percpu_counter_destroy(&sbi->s_dirs_counter);
4106 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
4107 percpu_counter_destroy(&sbi->s_extent_cache_cnt);
4108 if (sbi->s_mmp_tsk)
4109 kthread_stop(sbi->s_mmp_tsk);
4110 failed_mount2:
4111 for (i = 0; i < db_count; i++)
4112 brelse(sbi->s_group_desc[i]);
4113 ext4_kvfree(sbi->s_group_desc);
4114 failed_mount:
4115 if (sbi->s_chksum_driver)
4116 crypto_free_shash(sbi->s_chksum_driver);
4117 if (sbi->s_proc) {
4118 remove_proc_entry("options", sbi->s_proc);
4119 remove_proc_entry(sb->s_id, ext4_proc_root);
4120 }
4121 #ifdef CONFIG_QUOTA
4122 for (i = 0; i < MAXQUOTAS; i++)
4123 kfree(sbi->s_qf_names[i]);
4124 #endif
4125 ext4_blkdev_remove(sbi);
4126 brelse(bh);
4127 out_fail:
4128 sb->s_fs_info = NULL;
4129 kfree(sbi->s_blockgroup_lock);
4130 kfree(sbi);
4131 out_free_orig:
4132 kfree(orig_data);
4133 return err ? err : ret;
4134 }
4135
4136 /*
4137 * Setup any per-fs journal parameters now. We'll do this both on
4138 * initial mount, once the journal has been initialised but before we've
4139 * done any recovery; and again on any subsequent remount.
4140 */
4141 static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
4142 {
4143 struct ext4_sb_info *sbi = EXT4_SB(sb);
4144
4145 journal->j_commit_interval = sbi->s_commit_interval;
4146 journal->j_min_batch_time = sbi->s_min_batch_time;
4147 journal->j_max_batch_time = sbi->s_max_batch_time;
4148
4149 write_lock(&journal->j_state_lock);
4150 if (test_opt(sb, BARRIER))
4151 journal->j_flags |= JBD2_BARRIER;
4152 else
4153 journal->j_flags &= ~JBD2_BARRIER;
4154 if (test_opt(sb, DATA_ERR_ABORT))
4155 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
4156 else
4157 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
4158 write_unlock(&journal->j_state_lock);
4159 }
4160
4161 static journal_t *ext4_get_journal(struct super_block *sb,
4162 unsigned int journal_inum)
4163 {
4164 struct inode *journal_inode;
4165 journal_t *journal;
4166
4167 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4168
4169 /* First, test for the existence of a valid inode on disk. Bad
4170 * things happen if we iget() an unused inode, as the subsequent
4171 * iput() will try to delete it. */
4172
4173 journal_inode = ext4_iget(sb, journal_inum);
4174 if (IS_ERR(journal_inode)) {
4175 ext4_msg(sb, KERN_ERR, "no journal found");
4176 return NULL;
4177 }
4178 if (!journal_inode->i_nlink) {
4179 make_bad_inode(journal_inode);
4180 iput(journal_inode);
4181 ext4_msg(sb, KERN_ERR, "journal inode is deleted");
4182 return NULL;
4183 }
4184
4185 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
4186 journal_inode, journal_inode->i_size);
4187 if (!S_ISREG(journal_inode->i_mode)) {
4188 ext4_msg(sb, KERN_ERR, "invalid journal inode");
4189 iput(journal_inode);
4190 return NULL;
4191 }
4192
4193 journal = jbd2_journal_init_inode(journal_inode);
4194 if (!journal) {
4195 ext4_msg(sb, KERN_ERR, "Could not load journal inode");
4196 iput(journal_inode);
4197 return NULL;
4198 }
4199 journal->j_private = sb;
4200 ext4_init_journal_params(sb, journal);
4201 return journal;
4202 }
4203
4204 static journal_t *ext4_get_dev_journal(struct super_block *sb,
4205 dev_t j_dev)
4206 {
4207 struct buffer_head *bh;
4208 journal_t *journal;
4209 ext4_fsblk_t start;
4210 ext4_fsblk_t len;
4211 int hblock, blocksize;
4212 ext4_fsblk_t sb_block;
4213 unsigned long offset;
4214 struct ext4_super_block *es;
4215 struct block_device *bdev;
4216
4217 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4218
4219 bdev = ext4_blkdev_get(j_dev, sb);
4220 if (bdev == NULL)
4221 return NULL;
4222
4223 blocksize = sb->s_blocksize;
4224 hblock = bdev_logical_block_size(bdev);
4225 if (blocksize < hblock) {
4226 ext4_msg(sb, KERN_ERR,
4227 "blocksize too small for journal device");
4228 goto out_bdev;
4229 }
4230
4231 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
4232 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
4233 set_blocksize(bdev, blocksize);
4234 if (!(bh = __bread(bdev, sb_block, blocksize))) {
4235 ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
4236 "external journal");
4237 goto out_bdev;
4238 }
4239
4240 es = (struct ext4_super_block *) (bh->b_data + offset);
4241 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
4242 !(le32_to_cpu(es->s_feature_incompat) &
4243 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
4244 ext4_msg(sb, KERN_ERR, "external journal has "
4245 "bad superblock");
4246 brelse(bh);
4247 goto out_bdev;
4248 }
4249
4250 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
4251 ext4_msg(sb, KERN_ERR, "journal UUID does not match");
4252 brelse(bh);
4253 goto out_bdev;
4254 }
4255
4256 len = ext4_blocks_count(es);
4257 start = sb_block + 1;
4258 brelse(bh); /* we're done with the superblock */
4259
4260 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
4261 start, len, blocksize);
4262 if (!journal) {
4263 ext4_msg(sb, KERN_ERR, "failed to create device journal");
4264 goto out_bdev;
4265 }
4266 journal->j_private = sb;
4267 ll_rw_block(READ | REQ_META | REQ_PRIO, 1, &journal->j_sb_buffer);
4268 wait_on_buffer(journal->j_sb_buffer);
4269 if (!buffer_uptodate(journal->j_sb_buffer)) {
4270 ext4_msg(sb, KERN_ERR, "I/O error on journal device");
4271 goto out_journal;
4272 }
4273 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
4274 ext4_msg(sb, KERN_ERR, "External journal has more than one "
4275 "user (unsupported) - %d",
4276 be32_to_cpu(journal->j_superblock->s_nr_users));
4277 goto out_journal;
4278 }
4279 EXT4_SB(sb)->journal_bdev = bdev;
4280 ext4_init_journal_params(sb, journal);
4281 return journal;
4282
4283 out_journal:
4284 jbd2_journal_destroy(journal);
4285 out_bdev:
4286 ext4_blkdev_put(bdev);
4287 return NULL;
4288 }
4289
4290 static int ext4_load_journal(struct super_block *sb,
4291 struct ext4_super_block *es,
4292 unsigned long journal_devnum)
4293 {
4294 journal_t *journal;
4295 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
4296 dev_t journal_dev;
4297 int err = 0;
4298 int really_read_only;
4299
4300 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4301
4302 if (journal_devnum &&
4303 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
4304 ext4_msg(sb, KERN_INFO, "external journal device major/minor "
4305 "numbers have changed");
4306 journal_dev = new_decode_dev(journal_devnum);
4307 } else
4308 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
4309
4310 really_read_only = bdev_read_only(sb->s_bdev);
4311
4312 /*
4313 * Are we loading a blank journal or performing recovery after a
4314 * crash? For recovery, we need to check in advance whether we
4315 * can get read-write access to the device.
4316 */
4317 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
4318 if (sb->s_flags & MS_RDONLY) {
4319 ext4_msg(sb, KERN_INFO, "INFO: recovery "
4320 "required on readonly filesystem");
4321 if (really_read_only) {
4322 ext4_msg(sb, KERN_ERR, "write access "
4323 "unavailable, cannot proceed");
4324 return -EROFS;
4325 }
4326 ext4_msg(sb, KERN_INFO, "write access will "
4327 "be enabled during recovery");
4328 }
4329 }
4330
4331 if (journal_inum && journal_dev) {
4332 ext4_msg(sb, KERN_ERR, "filesystem has both journal "
4333 "and inode journals!");
4334 return -EINVAL;
4335 }
4336
4337 if (journal_inum) {
4338 if (!(journal = ext4_get_journal(sb, journal_inum)))
4339 return -EINVAL;
4340 } else {
4341 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
4342 return -EINVAL;
4343 }
4344
4345 if (!(journal->j_flags & JBD2_BARRIER))
4346 ext4_msg(sb, KERN_INFO, "barriers disabled");
4347
4348 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
4349 err = jbd2_journal_wipe(journal, !really_read_only);
4350 if (!err) {
4351 char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL);
4352 if (save)
4353 memcpy(save, ((char *) es) +
4354 EXT4_S_ERR_START, EXT4_S_ERR_LEN);
4355 err = jbd2_journal_load(journal);
4356 if (save)
4357 memcpy(((char *) es) + EXT4_S_ERR_START,
4358 save, EXT4_S_ERR_LEN);
4359 kfree(save);
4360 }
4361
4362 if (err) {
4363 ext4_msg(sb, KERN_ERR, "error loading journal");
4364 jbd2_journal_destroy(journal);
4365 return err;
4366 }
4367
4368 EXT4_SB(sb)->s_journal = journal;
4369 ext4_clear_journal_err(sb, es);
4370
4371 if (!really_read_only && journal_devnum &&
4372 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
4373 es->s_journal_dev = cpu_to_le32(journal_devnum);
4374
4375 /* Make sure we flush the recovery flag to disk. */
4376 ext4_commit_super(sb, 1);
4377 }
4378
4379 return 0;
4380 }
4381
4382 static int ext4_commit_super(struct super_block *sb, int sync)
4383 {
4384 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
4385 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
4386 int error = 0;
4387
4388 if (!sbh || block_device_ejected(sb))
4389 return error;
4390 if (buffer_write_io_error(sbh)) {
4391 /*
4392 * Oh, dear. A previous attempt to write the
4393 * superblock failed. This could happen because the
4394 * USB device was yanked out. Or it could happen to
4395 * be a transient write error and maybe the block will
4396 * be remapped. Nothing we can do but to retry the
4397 * write and hope for the best.
4398 */
4399 ext4_msg(sb, KERN_ERR, "previous I/O error to "
4400 "superblock detected");
4401 clear_buffer_write_io_error(sbh);
4402 set_buffer_uptodate(sbh);
4403 }
4404 /*
4405 * If the file system is mounted read-only, don't update the
4406 * superblock write time. This avoids updating the superblock
4407 * write time when we are mounting the root file system
4408 * read/only but we need to replay the journal; at that point,
4409 * for people who are east of GMT and who make their clock
4410 * tick in localtime for Windows bug-for-bug compatibility,
4411 * the clock is set in the future, and this will cause e2fsck
4412 * to complain and force a full file system check.
4413 */
4414 if (!(sb->s_flags & MS_RDONLY))
4415 es->s_wtime = cpu_to_le32(get_seconds());
4416 if (sb->s_bdev->bd_part)
4417 es->s_kbytes_written =
4418 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written +
4419 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
4420 EXT4_SB(sb)->s_sectors_written_start) >> 1));
4421 else
4422 es->s_kbytes_written =
4423 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written);
4424 ext4_free_blocks_count_set(es,
4425 EXT4_C2B(EXT4_SB(sb), percpu_counter_sum_positive(
4426 &EXT4_SB(sb)->s_freeclusters_counter)));
4427 es->s_free_inodes_count =
4428 cpu_to_le32(percpu_counter_sum_positive(
4429 &EXT4_SB(sb)->s_freeinodes_counter));
4430 BUFFER_TRACE(sbh, "marking dirty");
4431 ext4_superblock_csum_set(sb);
4432 mark_buffer_dirty(sbh);
4433 if (sync) {
4434 error = sync_dirty_buffer(sbh);
4435 if (error)
4436 return error;
4437
4438 error = buffer_write_io_error(sbh);
4439 if (error) {
4440 ext4_msg(sb, KERN_ERR, "I/O error while writing "
4441 "superblock");
4442 clear_buffer_write_io_error(sbh);
4443 set_buffer_uptodate(sbh);
4444 }
4445 }
4446 return error;
4447 }
4448
4449 /*
4450 * Have we just finished recovery? If so, and if we are mounting (or
4451 * remounting) the filesystem readonly, then we will end up with a
4452 * consistent fs on disk. Record that fact.
4453 */
4454 static void ext4_mark_recovery_complete(struct super_block *sb,
4455 struct ext4_super_block *es)
4456 {
4457 journal_t *journal = EXT4_SB(sb)->s_journal;
4458
4459 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
4460 BUG_ON(journal != NULL);
4461 return;
4462 }
4463 jbd2_journal_lock_updates(journal);
4464 if (jbd2_journal_flush(journal) < 0)
4465 goto out;
4466
4467 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
4468 sb->s_flags & MS_RDONLY) {
4469 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4470 ext4_commit_super(sb, 1);
4471 }
4472
4473 out:
4474 jbd2_journal_unlock_updates(journal);
4475 }
4476
4477 /*
4478 * If we are mounting (or read-write remounting) a filesystem whose journal
4479 * has recorded an error from a previous lifetime, move that error to the
4480 * main filesystem now.
4481 */
4482 static void ext4_clear_journal_err(struct super_block *sb,
4483 struct ext4_super_block *es)
4484 {
4485 journal_t *journal;
4486 int j_errno;
4487 const char *errstr;
4488
4489 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4490
4491 journal = EXT4_SB(sb)->s_journal;
4492
4493 /*
4494 * Now check for any error status which may have been recorded in the
4495 * journal by a prior ext4_error() or ext4_abort()
4496 */
4497
4498 j_errno = jbd2_journal_errno(journal);
4499 if (j_errno) {
4500 char nbuf[16];
4501
4502 errstr = ext4_decode_error(sb, j_errno, nbuf);
4503 ext4_warning(sb, "Filesystem error recorded "
4504 "from previous mount: %s", errstr);
4505 ext4_warning(sb, "Marking fs in need of filesystem check.");
4506
4507 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
4508 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
4509 ext4_commit_super(sb, 1);
4510
4511 jbd2_journal_clear_err(journal);
4512 jbd2_journal_update_sb_errno(journal);
4513 }
4514 }
4515
4516 /*
4517 * Force the running and committing transactions to commit,
4518 * and wait on the commit.
4519 */
4520 int ext4_force_commit(struct super_block *sb)
4521 {
4522 journal_t *journal;
4523
4524 if (sb->s_flags & MS_RDONLY)
4525 return 0;
4526
4527 journal = EXT4_SB(sb)->s_journal;
4528 return ext4_journal_force_commit(journal);
4529 }
4530
4531 static int ext4_sync_fs(struct super_block *sb, int wait)
4532 {
4533 int ret = 0;
4534 tid_t target;
4535 struct ext4_sb_info *sbi = EXT4_SB(sb);
4536
4537 trace_ext4_sync_fs(sb, wait);
4538 flush_workqueue(sbi->dio_unwritten_wq);
4539 /*
4540 * Writeback quota in non-journalled quota case - journalled quota has
4541 * no dirty dquots
4542 */
4543 dquot_writeback_dquots(sb, -1);
4544 if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
4545 if (wait)
4546 jbd2_log_wait_commit(sbi->s_journal, target);
4547 }
4548 return ret;
4549 }
4550
4551 /*
4552 * LVM calls this function before a (read-only) snapshot is created. This
4553 * gives us a chance to flush the journal completely and mark the fs clean.
4554 *
4555 * Note that only this function cannot bring a filesystem to be in a clean
4556 * state independently. It relies on upper layer to stop all data & metadata
4557 * modifications.
4558 */
4559 static int ext4_freeze(struct super_block *sb)
4560 {
4561 int error = 0;
4562 journal_t *journal;
4563
4564 if (sb->s_flags & MS_RDONLY)
4565 return 0;
4566
4567 journal = EXT4_SB(sb)->s_journal;
4568
4569 /* Now we set up the journal barrier. */
4570 jbd2_journal_lock_updates(journal);
4571
4572 /*
4573 * Don't clear the needs_recovery flag if we failed to flush
4574 * the journal.
4575 */
4576 error = jbd2_journal_flush(journal);
4577 if (error < 0)
4578 goto out;
4579
4580 /* Journal blocked and flushed, clear needs_recovery flag. */
4581 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4582 error = ext4_commit_super(sb, 1);
4583 out:
4584 /* we rely on upper layer to stop further updates */
4585 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
4586 return error;
4587 }
4588
4589 /*
4590 * Called by LVM after the snapshot is done. We need to reset the RECOVER
4591 * flag here, even though the filesystem is not technically dirty yet.
4592 */
4593 static int ext4_unfreeze(struct super_block *sb)
4594 {
4595 if (sb->s_flags & MS_RDONLY)
4596 return 0;
4597
4598 /* Reset the needs_recovery flag before the fs is unlocked. */
4599 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4600 ext4_commit_super(sb, 1);
4601 return 0;
4602 }
4603
4604 /*
4605 * Structure to save mount options for ext4_remount's benefit
4606 */
4607 struct ext4_mount_options {
4608 unsigned long s_mount_opt;
4609 unsigned long s_mount_opt2;
4610 kuid_t s_resuid;
4611 kgid_t s_resgid;
4612 unsigned long s_commit_interval;
4613 u32 s_min_batch_time, s_max_batch_time;
4614 #ifdef CONFIG_QUOTA
4615 int s_jquota_fmt;
4616 char *s_qf_names[MAXQUOTAS];
4617 #endif
4618 };
4619
4620 static int ext4_remount(struct super_block *sb, int *flags, char *data)
4621 {
4622 struct ext4_super_block *es;
4623 struct ext4_sb_info *sbi = EXT4_SB(sb);
4624 unsigned long old_sb_flags;
4625 struct ext4_mount_options old_opts;
4626 int enable_quota = 0;
4627 ext4_group_t g;
4628 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
4629 int err = 0;
4630 #ifdef CONFIG_QUOTA
4631 int i, j;
4632 #endif
4633 char *orig_data = kstrdup(data, GFP_KERNEL);
4634
4635 /* Store the original options */
4636 old_sb_flags = sb->s_flags;
4637 old_opts.s_mount_opt = sbi->s_mount_opt;
4638 old_opts.s_mount_opt2 = sbi->s_mount_opt2;
4639 old_opts.s_resuid = sbi->s_resuid;
4640 old_opts.s_resgid = sbi->s_resgid;
4641 old_opts.s_commit_interval = sbi->s_commit_interval;
4642 old_opts.s_min_batch_time = sbi->s_min_batch_time;
4643 old_opts.s_max_batch_time = sbi->s_max_batch_time;
4644 #ifdef CONFIG_QUOTA
4645 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
4646 for (i = 0; i < MAXQUOTAS; i++)
4647 if (sbi->s_qf_names[i]) {
4648 old_opts.s_qf_names[i] = kstrdup(sbi->s_qf_names[i],
4649 GFP_KERNEL);
4650 if (!old_opts.s_qf_names[i]) {
4651 for (j = 0; j < i; j++)
4652 kfree(old_opts.s_qf_names[j]);
4653 kfree(orig_data);
4654 return -ENOMEM;
4655 }
4656 } else
4657 old_opts.s_qf_names[i] = NULL;
4658 #endif
4659 if (sbi->s_journal && sbi->s_journal->j_task->io_context)
4660 journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
4661
4662 /*
4663 * Allow the "check" option to be passed as a remount option.
4664 */
4665 if (!parse_options(data, sb, NULL, &journal_ioprio, 1)) {
4666 err = -EINVAL;
4667 goto restore_opts;
4668 }
4669
4670 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
4671 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
4672 ext4_msg(sb, KERN_ERR, "can't mount with "
4673 "both data=journal and delalloc");
4674 err = -EINVAL;
4675 goto restore_opts;
4676 }
4677 if (test_opt(sb, DIOREAD_NOLOCK)) {
4678 ext4_msg(sb, KERN_ERR, "can't mount with "
4679 "both data=journal and dioread_nolock");
4680 err = -EINVAL;
4681 goto restore_opts;
4682 }
4683 }
4684
4685 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
4686 ext4_abort(sb, "Abort forced by user");
4687
4688 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
4689 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
4690
4691 es = sbi->s_es;
4692
4693 if (sbi->s_journal) {
4694 ext4_init_journal_params(sb, sbi->s_journal);
4695 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
4696 }
4697
4698 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
4699 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) {
4700 err = -EROFS;
4701 goto restore_opts;
4702 }
4703
4704 if (*flags & MS_RDONLY) {
4705 err = dquot_suspend(sb, -1);
4706 if (err < 0)
4707 goto restore_opts;
4708
4709 /*
4710 * First of all, the unconditional stuff we have to do
4711 * to disable replay of the journal when we next remount
4712 */
4713 sb->s_flags |= MS_RDONLY;
4714
4715 /*
4716 * OK, test if we are remounting a valid rw partition
4717 * readonly, and if so set the rdonly flag and then
4718 * mark the partition as valid again.
4719 */
4720 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
4721 (sbi->s_mount_state & EXT4_VALID_FS))
4722 es->s_state = cpu_to_le16(sbi->s_mount_state);
4723
4724 if (sbi->s_journal)
4725 ext4_mark_recovery_complete(sb, es);
4726 } else {
4727 /* Make sure we can mount this feature set readwrite */
4728 if (!ext4_feature_set_ok(sb, 0)) {
4729 err = -EROFS;
4730 goto restore_opts;
4731 }
4732 /*
4733 * Make sure the group descriptor checksums
4734 * are sane. If they aren't, refuse to remount r/w.
4735 */
4736 for (g = 0; g < sbi->s_groups_count; g++) {
4737 struct ext4_group_desc *gdp =
4738 ext4_get_group_desc(sb, g, NULL);
4739
4740 if (!ext4_group_desc_csum_verify(sb, g, gdp)) {
4741 ext4_msg(sb, KERN_ERR,
4742 "ext4_remount: Checksum for group %u failed (%u!=%u)",
4743 g, le16_to_cpu(ext4_group_desc_csum(sbi, g, gdp)),
4744 le16_to_cpu(gdp->bg_checksum));
4745 err = -EINVAL;
4746 goto restore_opts;
4747 }
4748 }
4749
4750 /*
4751 * If we have an unprocessed orphan list hanging
4752 * around from a previously readonly bdev mount,
4753 * require a full umount/remount for now.
4754 */
4755 if (es->s_last_orphan) {
4756 ext4_msg(sb, KERN_WARNING, "Couldn't "
4757 "remount RDWR because of unprocessed "
4758 "orphan inode list. Please "
4759 "umount/remount instead");
4760 err = -EINVAL;
4761 goto restore_opts;
4762 }
4763
4764 /*
4765 * Mounting a RDONLY partition read-write, so reread
4766 * and store the current valid flag. (It may have
4767 * been changed by e2fsck since we originally mounted
4768 * the partition.)
4769 */
4770 if (sbi->s_journal)
4771 ext4_clear_journal_err(sb, es);
4772 sbi->s_mount_state = le16_to_cpu(es->s_state);
4773 if (!ext4_setup_super(sb, es, 0))
4774 sb->s_flags &= ~MS_RDONLY;
4775 if (EXT4_HAS_INCOMPAT_FEATURE(sb,
4776 EXT4_FEATURE_INCOMPAT_MMP))
4777 if (ext4_multi_mount_protect(sb,
4778 le64_to_cpu(es->s_mmp_block))) {
4779 err = -EROFS;
4780 goto restore_opts;
4781 }
4782 enable_quota = 1;
4783 }
4784 }
4785
4786 /*
4787 * Reinitialize lazy itable initialization thread based on
4788 * current settings
4789 */
4790 if ((sb->s_flags & MS_RDONLY) || !test_opt(sb, INIT_INODE_TABLE))
4791 ext4_unregister_li_request(sb);
4792 else {
4793 ext4_group_t first_not_zeroed;
4794 first_not_zeroed = ext4_has_uninit_itable(sb);
4795 ext4_register_li_request(sb, first_not_zeroed);
4796 }
4797
4798 ext4_setup_system_zone(sb);
4799 if (sbi->s_journal == NULL && !(old_sb_flags & MS_RDONLY))
4800 ext4_commit_super(sb, 1);
4801
4802 #ifdef CONFIG_QUOTA
4803 /* Release old quota file names */
4804 for (i = 0; i < MAXQUOTAS; i++)
4805 kfree(old_opts.s_qf_names[i]);
4806 if (enable_quota) {
4807 if (sb_any_quota_suspended(sb))
4808 dquot_resume(sb, -1);
4809 else if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
4810 EXT4_FEATURE_RO_COMPAT_QUOTA)) {
4811 err = ext4_enable_quotas(sb);
4812 if (err)
4813 goto restore_opts;
4814 }
4815 }
4816 #endif
4817
4818 ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s", orig_data);
4819 kfree(orig_data);
4820 return 0;
4821
4822 restore_opts:
4823 sb->s_flags = old_sb_flags;
4824 sbi->s_mount_opt = old_opts.s_mount_opt;
4825 sbi->s_mount_opt2 = old_opts.s_mount_opt2;
4826 sbi->s_resuid = old_opts.s_resuid;
4827 sbi->s_resgid = old_opts.s_resgid;
4828 sbi->s_commit_interval = old_opts.s_commit_interval;
4829 sbi->s_min_batch_time = old_opts.s_min_batch_time;
4830 sbi->s_max_batch_time = old_opts.s_max_batch_time;
4831 #ifdef CONFIG_QUOTA
4832 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
4833 for (i = 0; i < MAXQUOTAS; i++) {
4834 kfree(sbi->s_qf_names[i]);
4835 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
4836 }
4837 #endif
4838 kfree(orig_data);
4839 return err;
4840 }
4841
4842 static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
4843 {
4844 struct super_block *sb = dentry->d_sb;
4845 struct ext4_sb_info *sbi = EXT4_SB(sb);
4846 struct ext4_super_block *es = sbi->s_es;
4847 ext4_fsblk_t overhead = 0, resv_blocks;
4848 u64 fsid;
4849 s64 bfree;
4850 resv_blocks = EXT4_C2B(sbi, atomic64_read(&sbi->s_resv_clusters));
4851
4852 if (!test_opt(sb, MINIX_DF))
4853 overhead = sbi->s_overhead;
4854
4855 buf->f_type = EXT4_SUPER_MAGIC;
4856 buf->f_bsize = sb->s_blocksize;
4857 buf->f_blocks = ext4_blocks_count(es) - EXT4_C2B(sbi, overhead);
4858 bfree = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) -
4859 percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter);
4860 /* prevent underflow in case that few free space is available */
4861 buf->f_bfree = EXT4_C2B(sbi, max_t(s64, bfree, 0));
4862 buf->f_bavail = buf->f_bfree -
4863 (ext4_r_blocks_count(es) + resv_blocks);
4864 if (buf->f_bfree < (ext4_r_blocks_count(es) + resv_blocks))
4865 buf->f_bavail = 0;
4866 buf->f_files = le32_to_cpu(es->s_inodes_count);
4867 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
4868 buf->f_namelen = EXT4_NAME_LEN;
4869 fsid = le64_to_cpup((void *)es->s_uuid) ^
4870 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
4871 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
4872 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
4873
4874 return 0;
4875 }
4876
4877 /* Helper function for writing quotas on sync - we need to start transaction
4878 * before quota file is locked for write. Otherwise the are possible deadlocks:
4879 * Process 1 Process 2
4880 * ext4_create() quota_sync()
4881 * jbd2_journal_start() write_dquot()
4882 * dquot_initialize() down(dqio_mutex)
4883 * down(dqio_mutex) jbd2_journal_start()
4884 *
4885 */
4886
4887 #ifdef CONFIG_QUOTA
4888
4889 static inline struct inode *dquot_to_inode(struct dquot *dquot)
4890 {
4891 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_id.type];
4892 }
4893
4894 static int ext4_write_dquot(struct dquot *dquot)
4895 {
4896 int ret, err;
4897 handle_t *handle;
4898 struct inode *inode;
4899
4900 inode = dquot_to_inode(dquot);
4901 handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
4902 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
4903 if (IS_ERR(handle))
4904 return PTR_ERR(handle);
4905 ret = dquot_commit(dquot);
4906 err = ext4_journal_stop(handle);
4907 if (!ret)
4908 ret = err;
4909 return ret;
4910 }
4911
4912 static int ext4_acquire_dquot(struct dquot *dquot)
4913 {
4914 int ret, err;
4915 handle_t *handle;
4916
4917 handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
4918 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
4919 if (IS_ERR(handle))
4920 return PTR_ERR(handle);
4921 ret = dquot_acquire(dquot);
4922 err = ext4_journal_stop(handle);
4923 if (!ret)
4924 ret = err;
4925 return ret;
4926 }
4927
4928 static int ext4_release_dquot(struct dquot *dquot)
4929 {
4930 int ret, err;
4931 handle_t *handle;
4932
4933 handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
4934 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
4935 if (IS_ERR(handle)) {
4936 /* Release dquot anyway to avoid endless cycle in dqput() */
4937 dquot_release(dquot);
4938 return PTR_ERR(handle);
4939 }
4940 ret = dquot_release(dquot);
4941 err = ext4_journal_stop(handle);
4942 if (!ret)
4943 ret = err;
4944 return ret;
4945 }
4946
4947 static int ext4_mark_dquot_dirty(struct dquot *dquot)
4948 {
4949 struct super_block *sb = dquot->dq_sb;
4950 struct ext4_sb_info *sbi = EXT4_SB(sb);
4951
4952 /* Are we journaling quotas? */
4953 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) ||
4954 sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
4955 dquot_mark_dquot_dirty(dquot);
4956 return ext4_write_dquot(dquot);
4957 } else {
4958 return dquot_mark_dquot_dirty(dquot);
4959 }
4960 }
4961
4962 static int ext4_write_info(struct super_block *sb, int type)
4963 {
4964 int ret, err;
4965 handle_t *handle;
4966
4967 /* Data block + inode block */
4968 handle = ext4_journal_start(sb->s_root->d_inode, EXT4_HT_QUOTA, 2);
4969 if (IS_ERR(handle))
4970 return PTR_ERR(handle);
4971 ret = dquot_commit_info(sb, type);
4972 err = ext4_journal_stop(handle);
4973 if (!ret)
4974 ret = err;
4975 return ret;
4976 }
4977
4978 /*
4979 * Turn on quotas during mount time - we need to find
4980 * the quota file and such...
4981 */
4982 static int ext4_quota_on_mount(struct super_block *sb, int type)
4983 {
4984 return dquot_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
4985 EXT4_SB(sb)->s_jquota_fmt, type);
4986 }
4987
4988 static void lockdep_set_quota_inode(struct inode *inode, int subclass)
4989 {
4990 struct ext4_inode_info *ei = EXT4_I(inode);
4991
4992 /* The first argument of lockdep_set_subclass has to be
4993 * *exactly* the same as the argument to init_rwsem() --- in
4994 * this case, in init_once() --- or lockdep gets unhappy
4995 * because the name of the lock is set using the
4996 * stringification of the argument to init_rwsem().
4997 */
4998 (void) ei; /* shut up clang warning if !CONFIG_LOCKDEP */
4999 lockdep_set_subclass(&ei->i_data_sem, subclass);
5000 }
5001
5002 /*
5003 * Standard function to be called on quota_on
5004 */
5005 static int ext4_quota_on(struct super_block *sb, int type, int format_id,
5006 struct path *path)
5007 {
5008 int err;
5009
5010 if (!test_opt(sb, QUOTA))
5011 return -EINVAL;
5012
5013 /* Quotafile not on the same filesystem? */
5014 if (path->dentry->d_sb != sb)
5015 return -EXDEV;
5016 /* Journaling quota? */
5017 if (EXT4_SB(sb)->s_qf_names[type]) {
5018 /* Quotafile not in fs root? */
5019 if (path->dentry->d_parent != sb->s_root)
5020 ext4_msg(sb, KERN_WARNING,
5021 "Quota file not on filesystem root. "
5022 "Journaled quota will not work");
5023 }
5024
5025 /*
5026 * When we journal data on quota file, we have to flush journal to see
5027 * all updates to the file when we bypass pagecache...
5028 */
5029 if (EXT4_SB(sb)->s_journal &&
5030 ext4_should_journal_data(path->dentry->d_inode)) {
5031 /*
5032 * We don't need to lock updates but journal_flush() could
5033 * otherwise be livelocked...
5034 */
5035 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
5036 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
5037 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
5038 if (err)
5039 return err;
5040 }
5041 lockdep_set_quota_inode(path->dentry->d_inode, I_DATA_SEM_QUOTA);
5042 err = dquot_quota_on(sb, type, format_id, path);
5043 if (err)
5044 lockdep_set_quota_inode(path->dentry->d_inode,
5045 I_DATA_SEM_NORMAL);
5046 return err;
5047 }
5048
5049 static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
5050 unsigned int flags)
5051 {
5052 int err;
5053 struct inode *qf_inode;
5054 unsigned long qf_inums[MAXQUOTAS] = {
5055 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
5056 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum)
5057 };
5058
5059 BUG_ON(!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA));
5060
5061 if (!qf_inums[type])
5062 return -EPERM;
5063
5064 qf_inode = ext4_iget(sb, qf_inums[type]);
5065 if (IS_ERR(qf_inode)) {
5066 ext4_error(sb, "Bad quota inode # %lu", qf_inums[type]);
5067 return PTR_ERR(qf_inode);
5068 }
5069
5070 /* Don't account quota for quota files to avoid recursion */
5071 qf_inode->i_flags |= S_NOQUOTA;
5072 lockdep_set_quota_inode(qf_inode, I_DATA_SEM_QUOTA);
5073 err = dquot_enable(qf_inode, type, format_id, flags);
5074 iput(qf_inode);
5075 if (err)
5076 lockdep_set_quota_inode(qf_inode, I_DATA_SEM_NORMAL);
5077
5078 return err;
5079 }
5080
5081 /* Enable usage tracking for all quota types. */
5082 static int ext4_enable_quotas(struct super_block *sb)
5083 {
5084 int type, err = 0;
5085 unsigned long qf_inums[MAXQUOTAS] = {
5086 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
5087 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum)
5088 };
5089
5090 sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE;
5091 for (type = 0; type < MAXQUOTAS; type++) {
5092 if (qf_inums[type]) {
5093 err = ext4_quota_enable(sb, type, QFMT_VFS_V1,
5094 DQUOT_USAGE_ENABLED);
5095 if (err) {
5096 ext4_warning(sb,
5097 "Failed to enable quota tracking "
5098 "(type=%d, err=%d). Please run "
5099 "e2fsck to fix.", type, err);
5100 return err;
5101 }
5102 }
5103 }
5104 return 0;
5105 }
5106
5107 /*
5108 * quota_on function that is used when QUOTA feature is set.
5109 */
5110 static int ext4_quota_on_sysfile(struct super_block *sb, int type,
5111 int format_id)
5112 {
5113 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA))
5114 return -EINVAL;
5115
5116 /*
5117 * USAGE was enabled at mount time. Only need to enable LIMITS now.
5118 */
5119 return ext4_quota_enable(sb, type, format_id, DQUOT_LIMITS_ENABLED);
5120 }
5121
5122 static int ext4_quota_off(struct super_block *sb, int type)
5123 {
5124 struct inode *inode = sb_dqopt(sb)->files[type];
5125 handle_t *handle;
5126
5127 /* Force all delayed allocation blocks to be allocated.
5128 * Caller already holds s_umount sem */
5129 if (test_opt(sb, DELALLOC))
5130 sync_filesystem(sb);
5131
5132 if (!inode)
5133 goto out;
5134
5135 /* Update modification times of quota files when userspace can
5136 * start looking at them */
5137 handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1);
5138 if (IS_ERR(handle))
5139 goto out;
5140 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
5141 ext4_mark_inode_dirty(handle, inode);
5142 ext4_journal_stop(handle);
5143
5144 out:
5145 return dquot_quota_off(sb, type);
5146 }
5147
5148 /*
5149 * quota_off function that is used when QUOTA feature is set.
5150 */
5151 static int ext4_quota_off_sysfile(struct super_block *sb, int type)
5152 {
5153 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA))
5154 return -EINVAL;
5155
5156 /* Disable only the limits. */
5157 return dquot_disable(sb, type, DQUOT_LIMITS_ENABLED);
5158 }
5159
5160 /* Read data from quotafile - avoid pagecache and such because we cannot afford
5161 * acquiring the locks... As quota files are never truncated and quota code
5162 * itself serializes the operations (and no one else should touch the files)
5163 * we don't have to be afraid of races */
5164 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
5165 size_t len, loff_t off)
5166 {
5167 struct inode *inode = sb_dqopt(sb)->files[type];
5168 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
5169 int err = 0;
5170 int offset = off & (sb->s_blocksize - 1);
5171 int tocopy;
5172 size_t toread;
5173 struct buffer_head *bh;
5174 loff_t i_size = i_size_read(inode);
5175
5176 if (off > i_size)
5177 return 0;
5178 if (off+len > i_size)
5179 len = i_size-off;
5180 toread = len;
5181 while (toread > 0) {
5182 tocopy = sb->s_blocksize - offset < toread ?
5183 sb->s_blocksize - offset : toread;
5184 bh = ext4_bread(NULL, inode, blk, 0, &err);
5185 if (err)
5186 return err;
5187 if (!bh) /* A hole? */
5188 memset(data, 0, tocopy);
5189 else
5190 memcpy(data, bh->b_data+offset, tocopy);
5191 brelse(bh);
5192 offset = 0;
5193 toread -= tocopy;
5194 data += tocopy;
5195 blk++;
5196 }
5197 return len;
5198 }
5199
5200 /* Write to quotafile (we know the transaction is already started and has
5201 * enough credits) */
5202 static ssize_t ext4_quota_write(struct super_block *sb, int type,
5203 const char *data, size_t len, loff_t off)
5204 {
5205 struct inode *inode = sb_dqopt(sb)->files[type];
5206 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
5207 int err = 0;
5208 int offset = off & (sb->s_blocksize - 1);
5209 struct buffer_head *bh;
5210 handle_t *handle = journal_current_handle();
5211
5212 if (EXT4_SB(sb)->s_journal && !handle) {
5213 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
5214 " cancelled because transaction is not started",
5215 (unsigned long long)off, (unsigned long long)len);
5216 return -EIO;
5217 }
5218 /*
5219 * Since we account only one data block in transaction credits,
5220 * then it is impossible to cross a block boundary.
5221 */
5222 if (sb->s_blocksize - offset < len) {
5223 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
5224 " cancelled because not block aligned",
5225 (unsigned long long)off, (unsigned long long)len);
5226 return -EIO;
5227 }
5228
5229 bh = ext4_bread(handle, inode, blk, 1, &err);
5230 if (!bh)
5231 goto out;
5232 err = ext4_journal_get_write_access(handle, bh);
5233 if (err) {
5234 brelse(bh);
5235 goto out;
5236 }
5237 lock_buffer(bh);
5238 memcpy(bh->b_data+offset, data, len);
5239 flush_dcache_page(bh->b_page);
5240 unlock_buffer(bh);
5241 err = ext4_handle_dirty_metadata(handle, NULL, bh);
5242 brelse(bh);
5243 out:
5244 if (err)
5245 return err;
5246 if (inode->i_size < off + len) {
5247 i_size_write(inode, off + len);
5248 EXT4_I(inode)->i_disksize = inode->i_size;
5249 ext4_mark_inode_dirty(handle, inode);
5250 }
5251 return len;
5252 }
5253
5254 #endif
5255
5256 static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
5257 const char *dev_name, void *data)
5258 {
5259 return mount_bdev(fs_type, flags, dev_name, data, ext4_fill_super);
5260 }
5261
5262 #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
5263 static inline void register_as_ext2(void)
5264 {
5265 int err = register_filesystem(&ext2_fs_type);
5266 if (err)
5267 printk(KERN_WARNING
5268 "EXT4-fs: Unable to register as ext2 (%d)\n", err);
5269 }
5270
5271 static inline void unregister_as_ext2(void)
5272 {
5273 unregister_filesystem(&ext2_fs_type);
5274 }
5275
5276 static inline int ext2_feature_set_ok(struct super_block *sb)
5277 {
5278 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP))
5279 return 0;
5280 if (sb->s_flags & MS_RDONLY)
5281 return 1;
5282 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))
5283 return 0;
5284 return 1;
5285 }
5286 #else
5287 static inline void register_as_ext2(void) { }
5288 static inline void unregister_as_ext2(void) { }
5289 static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; }
5290 #endif
5291
5292 #if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
5293 static inline void register_as_ext3(void)
5294 {
5295 int err = register_filesystem(&ext3_fs_type);
5296 if (err)
5297 printk(KERN_WARNING
5298 "EXT4-fs: Unable to register as ext3 (%d)\n", err);
5299 }
5300
5301 static inline void unregister_as_ext3(void)
5302 {
5303 unregister_filesystem(&ext3_fs_type);
5304 }
5305
5306 static inline int ext3_feature_set_ok(struct super_block *sb)
5307 {
5308 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP))
5309 return 0;
5310 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
5311 return 0;
5312 if (sb->s_flags & MS_RDONLY)
5313 return 1;
5314 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP))
5315 return 0;
5316 return 1;
5317 }
5318 #else
5319 static inline void register_as_ext3(void) { }
5320 static inline void unregister_as_ext3(void) { }
5321 static inline int ext3_feature_set_ok(struct super_block *sb) { return 0; }
5322 #endif
5323
5324 static struct file_system_type ext4_fs_type = {
5325 .owner = THIS_MODULE,
5326 .name = "ext4",
5327 .mount = ext4_mount,
5328 .kill_sb = kill_block_super,
5329 .fs_flags = FS_REQUIRES_DEV,
5330 };
5331 MODULE_ALIAS_FS("ext4");
5332
5333 static int __init ext4_init_feat_adverts(void)
5334 {
5335 struct ext4_features *ef;
5336 int ret = -ENOMEM;
5337
5338 ef = kzalloc(sizeof(struct ext4_features), GFP_KERNEL);
5339 if (!ef)
5340 goto out;
5341
5342 ef->f_kobj.kset = ext4_kset;
5343 init_completion(&ef->f_kobj_unregister);
5344 ret = kobject_init_and_add(&ef->f_kobj, &ext4_feat_ktype, NULL,
5345 "features");
5346 if (ret) {
5347 kfree(ef);
5348 goto out;
5349 }
5350
5351 ext4_feat = ef;
5352 ret = 0;
5353 out:
5354 return ret;
5355 }
5356
5357 static void ext4_exit_feat_adverts(void)
5358 {
5359 kobject_put(&ext4_feat->f_kobj);
5360 wait_for_completion(&ext4_feat->f_kobj_unregister);
5361 kfree(ext4_feat);
5362 }
5363
5364 /* Shared across all ext4 file systems */
5365 wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
5366 struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ];
5367
5368 static int __init ext4_init_fs(void)
5369 {
5370 int i, err;
5371
5372 ext4_li_info = NULL;
5373 mutex_init(&ext4_li_mtx);
5374
5375 /* Build-time check for flags consistency */
5376 ext4_check_flag_values();
5377
5378 for (i = 0; i < EXT4_WQ_HASH_SZ; i++) {
5379 mutex_init(&ext4__aio_mutex[i]);
5380 init_waitqueue_head(&ext4__ioend_wq[i]);
5381 }
5382
5383 err = ext4_init_es();
5384 if (err)
5385 return err;
5386
5387 err = ext4_init_pageio();
5388 if (err)
5389 goto out7;
5390
5391 err = ext4_init_system_zone();
5392 if (err)
5393 goto out6;
5394 ext4_kset = kset_create_and_add("ext4", NULL, fs_kobj);
5395 if (!ext4_kset) {
5396 err = -ENOMEM;
5397 goto out5;
5398 }
5399 ext4_proc_root = proc_mkdir("fs/ext4", NULL);
5400
5401 err = ext4_init_feat_adverts();
5402 if (err)
5403 goto out4;
5404
5405 err = ext4_init_mballoc();
5406 if (err)
5407 goto out3;
5408
5409 err = ext4_init_xattr();
5410 if (err)
5411 goto out2;
5412 err = init_inodecache();
5413 if (err)
5414 goto out1;
5415 register_as_ext3();
5416 register_as_ext2();
5417 err = register_filesystem(&ext4_fs_type);
5418 if (err)
5419 goto out;
5420
5421 return 0;
5422 out:
5423 unregister_as_ext2();
5424 unregister_as_ext3();
5425 destroy_inodecache();
5426 out1:
5427 ext4_exit_xattr();
5428 out2:
5429 ext4_exit_mballoc();
5430 out3:
5431 ext4_exit_feat_adverts();
5432 out4:
5433 if (ext4_proc_root)
5434 remove_proc_entry("fs/ext4", NULL);
5435 kset_unregister(ext4_kset);
5436 out5:
5437 ext4_exit_system_zone();
5438 out6:
5439 ext4_exit_pageio();
5440 out7:
5441 ext4_exit_es();
5442
5443 return err;
5444 }
5445
5446 static void __exit ext4_exit_fs(void)
5447 {
5448 ext4_destroy_lazyinit_thread();
5449 unregister_as_ext2();
5450 unregister_as_ext3();
5451 unregister_filesystem(&ext4_fs_type);
5452 destroy_inodecache();
5453 ext4_exit_xattr();
5454 ext4_exit_mballoc();
5455 ext4_exit_feat_adverts();
5456 remove_proc_entry("fs/ext4", NULL);
5457 kset_unregister(ext4_kset);
5458 ext4_exit_system_zone();
5459 ext4_exit_pageio();
5460 ext4_exit_es();
5461 }
5462
5463 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
5464 MODULE_DESCRIPTION("Fourth Extended Filesystem");
5465 MODULE_LICENSE("GPL");
5466 module_init(ext4_init_fs)
5467 module_exit(ext4_exit_fs)
kernel source for telekom puls (alcatel/mediatek)