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Merge branch 'perm-fix' into omap-for-v4.19/fixes-v2
[mirror_ubuntu-eoan-kernel.git] / fs / ext4 / super.c
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * linux/fs/ext4/super.c
4 *
5 * Copyright (C) 1992, 1993, 1994, 1995
6 * Remy Card (card@masi.ibp.fr)
7 * Laboratoire MASI - Institut Blaise Pascal
8 * Universite Pierre et Marie Curie (Paris VI)
9 *
10 * from
11 *
12 * linux/fs/minix/inode.c
13 *
14 * Copyright (C) 1991, 1992 Linus Torvalds
15 *
16 * Big-endian to little-endian byte-swapping/bitmaps by
17 * David S. Miller (davem@caip.rutgers.edu), 1995
18 */
19
20 #include <linux/module.h>
21 #include <linux/string.h>
22 #include <linux/fs.h>
23 #include <linux/time.h>
24 #include <linux/vmalloc.h>
25 #include <linux/slab.h>
26 #include <linux/init.h>
27 #include <linux/blkdev.h>
28 #include <linux/backing-dev.h>
29 #include <linux/parser.h>
30 #include <linux/buffer_head.h>
31 #include <linux/exportfs.h>
32 #include <linux/vfs.h>
33 #include <linux/random.h>
34 #include <linux/mount.h>
35 #include <linux/namei.h>
36 #include <linux/quotaops.h>
37 #include <linux/seq_file.h>
38 #include <linux/ctype.h>
39 #include <linux/log2.h>
40 #include <linux/crc16.h>
41 #include <linux/dax.h>
42 #include <linux/cleancache.h>
43 #include <linux/uaccess.h>
44 #include <linux/iversion.h>
45
46 #include <linux/kthread.h>
47 #include <linux/freezer.h>
48
49 #include "ext4.h"
50 #include "ext4_extents.h" /* Needed for trace points definition */
51 #include "ext4_jbd2.h"
52 #include "xattr.h"
53 #include "acl.h"
54 #include "mballoc.h"
55 #include "fsmap.h"
56
57 #define CREATE_TRACE_POINTS
58 #include <trace/events/ext4.h>
59
60 static struct ext4_lazy_init *ext4_li_info;
61 static struct mutex ext4_li_mtx;
62 static struct ratelimit_state ext4_mount_msg_ratelimit;
63
64 static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
65 unsigned long journal_devnum);
66 static int ext4_show_options(struct seq_file *seq, struct dentry *root);
67 static int ext4_commit_super(struct super_block *sb, int sync);
68 static void ext4_mark_recovery_complete(struct super_block *sb,
69 struct ext4_super_block *es);
70 static void ext4_clear_journal_err(struct super_block *sb,
71 struct ext4_super_block *es);
72 static int ext4_sync_fs(struct super_block *sb, int wait);
73 static int ext4_remount(struct super_block *sb, int *flags, char *data);
74 static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
75 static int ext4_unfreeze(struct super_block *sb);
76 static int ext4_freeze(struct super_block *sb);
77 static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
78 const char *dev_name, void *data);
79 static inline int ext2_feature_set_ok(struct super_block *sb);
80 static inline int ext3_feature_set_ok(struct super_block *sb);
81 static int ext4_feature_set_ok(struct super_block *sb, int readonly);
82 static void ext4_destroy_lazyinit_thread(void);
83 static void ext4_unregister_li_request(struct super_block *sb);
84 static void ext4_clear_request_list(void);
85 static struct inode *ext4_get_journal_inode(struct super_block *sb,
86 unsigned int journal_inum);
87
88 /*
89 * Lock ordering
90 *
91 * Note the difference between i_mmap_sem (EXT4_I(inode)->i_mmap_sem) and
92 * i_mmap_rwsem (inode->i_mmap_rwsem)!
93 *
94 * page fault path:
95 * mmap_sem -> sb_start_pagefault -> i_mmap_sem (r) -> transaction start ->
96 * page lock -> i_data_sem (rw)
97 *
98 * buffered write path:
99 * sb_start_write -> i_mutex -> mmap_sem
100 * sb_start_write -> i_mutex -> transaction start -> page lock ->
101 * i_data_sem (rw)
102 *
103 * truncate:
104 * sb_start_write -> i_mutex -> i_mmap_sem (w) -> i_mmap_rwsem (w) -> page lock
105 * sb_start_write -> i_mutex -> i_mmap_sem (w) -> transaction start ->
106 * i_data_sem (rw)
107 *
108 * direct IO:
109 * sb_start_write -> i_mutex -> mmap_sem
110 * sb_start_write -> i_mutex -> transaction start -> i_data_sem (rw)
111 *
112 * writepages:
113 * transaction start -> page lock(s) -> i_data_sem (rw)
114 */
115
116 #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2)
117 static struct file_system_type ext2_fs_type = {
118 .owner = THIS_MODULE,
119 .name = "ext2",
120 .mount = ext4_mount,
121 .kill_sb = kill_block_super,
122 .fs_flags = FS_REQUIRES_DEV,
123 };
124 MODULE_ALIAS_FS("ext2");
125 MODULE_ALIAS("ext2");
126 #define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type)
127 #else
128 #define IS_EXT2_SB(sb) (0)
129 #endif
130
131
132 static struct file_system_type ext3_fs_type = {
133 .owner = THIS_MODULE,
134 .name = "ext3",
135 .mount = ext4_mount,
136 .kill_sb = kill_block_super,
137 .fs_flags = FS_REQUIRES_DEV,
138 };
139 MODULE_ALIAS_FS("ext3");
140 MODULE_ALIAS("ext3");
141 #define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type)
142
143 static int ext4_verify_csum_type(struct super_block *sb,
144 struct ext4_super_block *es)
145 {
146 if (!ext4_has_feature_metadata_csum(sb))
147 return 1;
148
149 return es->s_checksum_type == EXT4_CRC32C_CHKSUM;
150 }
151
152 static __le32 ext4_superblock_csum(struct super_block *sb,
153 struct ext4_super_block *es)
154 {
155 struct ext4_sb_info *sbi = EXT4_SB(sb);
156 int offset = offsetof(struct ext4_super_block, s_checksum);
157 __u32 csum;
158
159 csum = ext4_chksum(sbi, ~0, (char *)es, offset);
160
161 return cpu_to_le32(csum);
162 }
163
164 static int ext4_superblock_csum_verify(struct super_block *sb,
165 struct ext4_super_block *es)
166 {
167 if (!ext4_has_metadata_csum(sb))
168 return 1;
169
170 return es->s_checksum == ext4_superblock_csum(sb, es);
171 }
172
173 void ext4_superblock_csum_set(struct super_block *sb)
174 {
175 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
176
177 if (!ext4_has_metadata_csum(sb))
178 return;
179
180 es->s_checksum = ext4_superblock_csum(sb, es);
181 }
182
183 void *ext4_kvmalloc(size_t size, gfp_t flags)
184 {
185 void *ret;
186
187 ret = kmalloc(size, flags | __GFP_NOWARN);
188 if (!ret)
189 ret = __vmalloc(size, flags, PAGE_KERNEL);
190 return ret;
191 }
192
193 void *ext4_kvzalloc(size_t size, gfp_t flags)
194 {
195 void *ret;
196
197 ret = kzalloc(size, flags | __GFP_NOWARN);
198 if (!ret)
199 ret = __vmalloc(size, flags | __GFP_ZERO, PAGE_KERNEL);
200 return ret;
201 }
202
203 ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
204 struct ext4_group_desc *bg)
205 {
206 return le32_to_cpu(bg->bg_block_bitmap_lo) |
207 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
208 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
209 }
210
211 ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
212 struct ext4_group_desc *bg)
213 {
214 return le32_to_cpu(bg->bg_inode_bitmap_lo) |
215 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
216 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
217 }
218
219 ext4_fsblk_t ext4_inode_table(struct super_block *sb,
220 struct ext4_group_desc *bg)
221 {
222 return le32_to_cpu(bg->bg_inode_table_lo) |
223 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
224 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
225 }
226
227 __u32 ext4_free_group_clusters(struct super_block *sb,
228 struct ext4_group_desc *bg)
229 {
230 return le16_to_cpu(bg->bg_free_blocks_count_lo) |
231 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
232 (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0);
233 }
234
235 __u32 ext4_free_inodes_count(struct super_block *sb,
236 struct ext4_group_desc *bg)
237 {
238 return le16_to_cpu(bg->bg_free_inodes_count_lo) |
239 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
240 (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0);
241 }
242
243 __u32 ext4_used_dirs_count(struct super_block *sb,
244 struct ext4_group_desc *bg)
245 {
246 return le16_to_cpu(bg->bg_used_dirs_count_lo) |
247 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
248 (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0);
249 }
250
251 __u32 ext4_itable_unused_count(struct super_block *sb,
252 struct ext4_group_desc *bg)
253 {
254 return le16_to_cpu(bg->bg_itable_unused_lo) |
255 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
256 (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0);
257 }
258
259 void ext4_block_bitmap_set(struct super_block *sb,
260 struct ext4_group_desc *bg, ext4_fsblk_t blk)
261 {
262 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
263 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
264 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
265 }
266
267 void ext4_inode_bitmap_set(struct super_block *sb,
268 struct ext4_group_desc *bg, ext4_fsblk_t blk)
269 {
270 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk);
271 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
272 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
273 }
274
275 void ext4_inode_table_set(struct super_block *sb,
276 struct ext4_group_desc *bg, ext4_fsblk_t blk)
277 {
278 bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
279 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
280 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
281 }
282
283 void ext4_free_group_clusters_set(struct super_block *sb,
284 struct ext4_group_desc *bg, __u32 count)
285 {
286 bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count);
287 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
288 bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16);
289 }
290
291 void ext4_free_inodes_set(struct super_block *sb,
292 struct ext4_group_desc *bg, __u32 count)
293 {
294 bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count);
295 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
296 bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16);
297 }
298
299 void ext4_used_dirs_set(struct super_block *sb,
300 struct ext4_group_desc *bg, __u32 count)
301 {
302 bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count);
303 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
304 bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16);
305 }
306
307 void ext4_itable_unused_set(struct super_block *sb,
308 struct ext4_group_desc *bg, __u32 count)
309 {
310 bg->bg_itable_unused_lo = cpu_to_le16((__u16)count);
311 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
312 bg->bg_itable_unused_hi = cpu_to_le16(count >> 16);
313 }
314
315 static void __ext4_update_tstamp(__le32 *lo, __u8 *hi)
316 {
317 time64_t now = ktime_get_real_seconds();
318
319 now = clamp_val(now, 0, (1ull << 40) - 1);
320
321 *lo = cpu_to_le32(lower_32_bits(now));
322 *hi = upper_32_bits(now);
323 }
324
325 static time64_t __ext4_get_tstamp(__le32 *lo, __u8 *hi)
326 {
327 return ((time64_t)(*hi) << 32) + le32_to_cpu(*lo);
328 }
329 #define ext4_update_tstamp(es, tstamp) \
330 __ext4_update_tstamp(&(es)->tstamp, &(es)->tstamp ## _hi)
331 #define ext4_get_tstamp(es, tstamp) \
332 __ext4_get_tstamp(&(es)->tstamp, &(es)->tstamp ## _hi)
333
334 static void __save_error_info(struct super_block *sb, const char *func,
335 unsigned int line)
336 {
337 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
338
339 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
340 if (bdev_read_only(sb->s_bdev))
341 return;
342 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
343 ext4_update_tstamp(es, s_last_error_time);
344 strncpy(es->s_last_error_func, func, sizeof(es->s_last_error_func));
345 es->s_last_error_line = cpu_to_le32(line);
346 if (!es->s_first_error_time) {
347 es->s_first_error_time = es->s_last_error_time;
348 es->s_first_error_time_hi = es->s_last_error_time_hi;
349 strncpy(es->s_first_error_func, func,
350 sizeof(es->s_first_error_func));
351 es->s_first_error_line = cpu_to_le32(line);
352 es->s_first_error_ino = es->s_last_error_ino;
353 es->s_first_error_block = es->s_last_error_block;
354 }
355 /*
356 * Start the daily error reporting function if it hasn't been
357 * started already
358 */
359 if (!es->s_error_count)
360 mod_timer(&EXT4_SB(sb)->s_err_report, jiffies + 24*60*60*HZ);
361 le32_add_cpu(&es->s_error_count, 1);
362 }
363
364 static void save_error_info(struct super_block *sb, const char *func,
365 unsigned int line)
366 {
367 __save_error_info(sb, func, line);
368 ext4_commit_super(sb, 1);
369 }
370
371 /*
372 * The del_gendisk() function uninitializes the disk-specific data
373 * structures, including the bdi structure, without telling anyone
374 * else. Once this happens, any attempt to call mark_buffer_dirty()
375 * (for example, by ext4_commit_super), will cause a kernel OOPS.
376 * This is a kludge to prevent these oops until we can put in a proper
377 * hook in del_gendisk() to inform the VFS and file system layers.
378 */
379 static int block_device_ejected(struct super_block *sb)
380 {
381 struct inode *bd_inode = sb->s_bdev->bd_inode;
382 struct backing_dev_info *bdi = inode_to_bdi(bd_inode);
383
384 return bdi->dev == NULL;
385 }
386
387 static void ext4_journal_commit_callback(journal_t *journal, transaction_t *txn)
388 {
389 struct super_block *sb = journal->j_private;
390 struct ext4_sb_info *sbi = EXT4_SB(sb);
391 int error = is_journal_aborted(journal);
392 struct ext4_journal_cb_entry *jce;
393
394 BUG_ON(txn->t_state == T_FINISHED);
395
396 ext4_process_freed_data(sb, txn->t_tid);
397
398 spin_lock(&sbi->s_md_lock);
399 while (!list_empty(&txn->t_private_list)) {
400 jce = list_entry(txn->t_private_list.next,
401 struct ext4_journal_cb_entry, jce_list);
402 list_del_init(&jce->jce_list);
403 spin_unlock(&sbi->s_md_lock);
404 jce->jce_func(sb, jce, error);
405 spin_lock(&sbi->s_md_lock);
406 }
407 spin_unlock(&sbi->s_md_lock);
408 }
409
410 /* Deal with the reporting of failure conditions on a filesystem such as
411 * inconsistencies detected or read IO failures.
412 *
413 * On ext2, we can store the error state of the filesystem in the
414 * superblock. That is not possible on ext4, because we may have other
415 * write ordering constraints on the superblock which prevent us from
416 * writing it out straight away; and given that the journal is about to
417 * be aborted, we can't rely on the current, or future, transactions to
418 * write out the superblock safely.
419 *
420 * We'll just use the jbd2_journal_abort() error code to record an error in
421 * the journal instead. On recovery, the journal will complain about
422 * that error until we've noted it down and cleared it.
423 */
424
425 static void ext4_handle_error(struct super_block *sb)
426 {
427 if (test_opt(sb, WARN_ON_ERROR))
428 WARN_ON_ONCE(1);
429
430 if (sb_rdonly(sb))
431 return;
432
433 if (!test_opt(sb, ERRORS_CONT)) {
434 journal_t *journal = EXT4_SB(sb)->s_journal;
435
436 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
437 if (journal)
438 jbd2_journal_abort(journal, -EIO);
439 }
440 if (test_opt(sb, ERRORS_RO)) {
441 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
442 /*
443 * Make sure updated value of ->s_mount_flags will be visible
444 * before ->s_flags update
445 */
446 smp_wmb();
447 sb->s_flags |= SB_RDONLY;
448 }
449 if (test_opt(sb, ERRORS_PANIC)) {
450 if (EXT4_SB(sb)->s_journal &&
451 !(EXT4_SB(sb)->s_journal->j_flags & JBD2_REC_ERR))
452 return;
453 panic("EXT4-fs (device %s): panic forced after error\n",
454 sb->s_id);
455 }
456 }
457
458 #define ext4_error_ratelimit(sb) \
459 ___ratelimit(&(EXT4_SB(sb)->s_err_ratelimit_state), \
460 "EXT4-fs error")
461
462 void __ext4_error(struct super_block *sb, const char *function,
463 unsigned int line, const char *fmt, ...)
464 {
465 struct va_format vaf;
466 va_list args;
467
468 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
469 return;
470
471 trace_ext4_error(sb, function, line);
472 if (ext4_error_ratelimit(sb)) {
473 va_start(args, fmt);
474 vaf.fmt = fmt;
475 vaf.va = &args;
476 printk(KERN_CRIT
477 "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n",
478 sb->s_id, function, line, current->comm, &vaf);
479 va_end(args);
480 }
481 save_error_info(sb, function, line);
482 ext4_handle_error(sb);
483 }
484
485 void __ext4_error_inode(struct inode *inode, const char *function,
486 unsigned int line, ext4_fsblk_t block,
487 const char *fmt, ...)
488 {
489 va_list args;
490 struct va_format vaf;
491 struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
492
493 if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
494 return;
495
496 trace_ext4_error(inode->i_sb, function, line);
497 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
498 es->s_last_error_block = cpu_to_le64(block);
499 if (ext4_error_ratelimit(inode->i_sb)) {
500 va_start(args, fmt);
501 vaf.fmt = fmt;
502 vaf.va = &args;
503 if (block)
504 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
505 "inode #%lu: block %llu: comm %s: %pV\n",
506 inode->i_sb->s_id, function, line, inode->i_ino,
507 block, current->comm, &vaf);
508 else
509 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
510 "inode #%lu: comm %s: %pV\n",
511 inode->i_sb->s_id, function, line, inode->i_ino,
512 current->comm, &vaf);
513 va_end(args);
514 }
515 save_error_info(inode->i_sb, function, line);
516 ext4_handle_error(inode->i_sb);
517 }
518
519 void __ext4_error_file(struct file *file, const char *function,
520 unsigned int line, ext4_fsblk_t block,
521 const char *fmt, ...)
522 {
523 va_list args;
524 struct va_format vaf;
525 struct ext4_super_block *es;
526 struct inode *inode = file_inode(file);
527 char pathname[80], *path;
528
529 if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
530 return;
531
532 trace_ext4_error(inode->i_sb, function, line);
533 es = EXT4_SB(inode->i_sb)->s_es;
534 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
535 if (ext4_error_ratelimit(inode->i_sb)) {
536 path = file_path(file, pathname, sizeof(pathname));
537 if (IS_ERR(path))
538 path = "(unknown)";
539 va_start(args, fmt);
540 vaf.fmt = fmt;
541 vaf.va = &args;
542 if (block)
543 printk(KERN_CRIT
544 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
545 "block %llu: comm %s: path %s: %pV\n",
546 inode->i_sb->s_id, function, line, inode->i_ino,
547 block, current->comm, path, &vaf);
548 else
549 printk(KERN_CRIT
550 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
551 "comm %s: path %s: %pV\n",
552 inode->i_sb->s_id, function, line, inode->i_ino,
553 current->comm, path, &vaf);
554 va_end(args);
555 }
556 save_error_info(inode->i_sb, function, line);
557 ext4_handle_error(inode->i_sb);
558 }
559
560 const char *ext4_decode_error(struct super_block *sb, int errno,
561 char nbuf[16])
562 {
563 char *errstr = NULL;
564
565 switch (errno) {
566 case -EFSCORRUPTED:
567 errstr = "Corrupt filesystem";
568 break;
569 case -EFSBADCRC:
570 errstr = "Filesystem failed CRC";
571 break;
572 case -EIO:
573 errstr = "IO failure";
574 break;
575 case -ENOMEM:
576 errstr = "Out of memory";
577 break;
578 case -EROFS:
579 if (!sb || (EXT4_SB(sb)->s_journal &&
580 EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT))
581 errstr = "Journal has aborted";
582 else
583 errstr = "Readonly filesystem";
584 break;
585 default:
586 /* If the caller passed in an extra buffer for unknown
587 * errors, textualise them now. Else we just return
588 * NULL. */
589 if (nbuf) {
590 /* Check for truncated error codes... */
591 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
592 errstr = nbuf;
593 }
594 break;
595 }
596
597 return errstr;
598 }
599
600 /* __ext4_std_error decodes expected errors from journaling functions
601 * automatically and invokes the appropriate error response. */
602
603 void __ext4_std_error(struct super_block *sb, const char *function,
604 unsigned int line, int errno)
605 {
606 char nbuf[16];
607 const char *errstr;
608
609 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
610 return;
611
612 /* Special case: if the error is EROFS, and we're not already
613 * inside a transaction, then there's really no point in logging
614 * an error. */
615 if (errno == -EROFS && journal_current_handle() == NULL && sb_rdonly(sb))
616 return;
617
618 if (ext4_error_ratelimit(sb)) {
619 errstr = ext4_decode_error(sb, errno, nbuf);
620 printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n",
621 sb->s_id, function, line, errstr);
622 }
623
624 save_error_info(sb, function, line);
625 ext4_handle_error(sb);
626 }
627
628 /*
629 * ext4_abort is a much stronger failure handler than ext4_error. The
630 * abort function may be used to deal with unrecoverable failures such
631 * as journal IO errors or ENOMEM at a critical moment in log management.
632 *
633 * We unconditionally force the filesystem into an ABORT|READONLY state,
634 * unless the error response on the fs has been set to panic in which
635 * case we take the easy way out and panic immediately.
636 */
637
638 void __ext4_abort(struct super_block *sb, const char *function,
639 unsigned int line, const char *fmt, ...)
640 {
641 struct va_format vaf;
642 va_list args;
643
644 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
645 return;
646
647 save_error_info(sb, function, line);
648 va_start(args, fmt);
649 vaf.fmt = fmt;
650 vaf.va = &args;
651 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: %pV\n",
652 sb->s_id, function, line, &vaf);
653 va_end(args);
654
655 if (sb_rdonly(sb) == 0) {
656 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
657 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
658 /*
659 * Make sure updated value of ->s_mount_flags will be visible
660 * before ->s_flags update
661 */
662 smp_wmb();
663 sb->s_flags |= SB_RDONLY;
664 if (EXT4_SB(sb)->s_journal)
665 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
666 save_error_info(sb, function, line);
667 }
668 if (test_opt(sb, ERRORS_PANIC)) {
669 if (EXT4_SB(sb)->s_journal &&
670 !(EXT4_SB(sb)->s_journal->j_flags & JBD2_REC_ERR))
671 return;
672 panic("EXT4-fs panic from previous error\n");
673 }
674 }
675
676 void __ext4_msg(struct super_block *sb,
677 const char *prefix, const char *fmt, ...)
678 {
679 struct va_format vaf;
680 va_list args;
681
682 if (!___ratelimit(&(EXT4_SB(sb)->s_msg_ratelimit_state), "EXT4-fs"))
683 return;
684
685 va_start(args, fmt);
686 vaf.fmt = fmt;
687 vaf.va = &args;
688 printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
689 va_end(args);
690 }
691
692 #define ext4_warning_ratelimit(sb) \
693 ___ratelimit(&(EXT4_SB(sb)->s_warning_ratelimit_state), \
694 "EXT4-fs warning")
695
696 void __ext4_warning(struct super_block *sb, const char *function,
697 unsigned int line, const char *fmt, ...)
698 {
699 struct va_format vaf;
700 va_list args;
701
702 if (!ext4_warning_ratelimit(sb))
703 return;
704
705 va_start(args, fmt);
706 vaf.fmt = fmt;
707 vaf.va = &args;
708 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: %pV\n",
709 sb->s_id, function, line, &vaf);
710 va_end(args);
711 }
712
713 void __ext4_warning_inode(const struct inode *inode, const char *function,
714 unsigned int line, const char *fmt, ...)
715 {
716 struct va_format vaf;
717 va_list args;
718
719 if (!ext4_warning_ratelimit(inode->i_sb))
720 return;
721
722 va_start(args, fmt);
723 vaf.fmt = fmt;
724 vaf.va = &args;
725 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: "
726 "inode #%lu: comm %s: %pV\n", inode->i_sb->s_id,
727 function, line, inode->i_ino, current->comm, &vaf);
728 va_end(args);
729 }
730
731 void __ext4_grp_locked_error(const char *function, unsigned int line,
732 struct super_block *sb, ext4_group_t grp,
733 unsigned long ino, ext4_fsblk_t block,
734 const char *fmt, ...)
735 __releases(bitlock)
736 __acquires(bitlock)
737 {
738 struct va_format vaf;
739 va_list args;
740 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
741
742 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
743 return;
744
745 trace_ext4_error(sb, function, line);
746 es->s_last_error_ino = cpu_to_le32(ino);
747 es->s_last_error_block = cpu_to_le64(block);
748 __save_error_info(sb, function, line);
749
750 if (ext4_error_ratelimit(sb)) {
751 va_start(args, fmt);
752 vaf.fmt = fmt;
753 vaf.va = &args;
754 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u, ",
755 sb->s_id, function, line, grp);
756 if (ino)
757 printk(KERN_CONT "inode %lu: ", ino);
758 if (block)
759 printk(KERN_CONT "block %llu:",
760 (unsigned long long) block);
761 printk(KERN_CONT "%pV\n", &vaf);
762 va_end(args);
763 }
764
765 if (test_opt(sb, WARN_ON_ERROR))
766 WARN_ON_ONCE(1);
767
768 if (test_opt(sb, ERRORS_CONT)) {
769 ext4_commit_super(sb, 0);
770 return;
771 }
772
773 ext4_unlock_group(sb, grp);
774 ext4_commit_super(sb, 1);
775 ext4_handle_error(sb);
776 /*
777 * We only get here in the ERRORS_RO case; relocking the group
778 * may be dangerous, but nothing bad will happen since the
779 * filesystem will have already been marked read/only and the
780 * journal has been aborted. We return 1 as a hint to callers
781 * who might what to use the return value from
782 * ext4_grp_locked_error() to distinguish between the
783 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
784 * aggressively from the ext4 function in question, with a
785 * more appropriate error code.
786 */
787 ext4_lock_group(sb, grp);
788 return;
789 }
790
791 void ext4_mark_group_bitmap_corrupted(struct super_block *sb,
792 ext4_group_t group,
793 unsigned int flags)
794 {
795 struct ext4_sb_info *sbi = EXT4_SB(sb);
796 struct ext4_group_info *grp = ext4_get_group_info(sb, group);
797 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, group, NULL);
798 int ret;
799
800 if (flags & EXT4_GROUP_INFO_BBITMAP_CORRUPT) {
801 ret = ext4_test_and_set_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT,
802 &grp->bb_state);
803 if (!ret)
804 percpu_counter_sub(&sbi->s_freeclusters_counter,
805 grp->bb_free);
806 }
807
808 if (flags & EXT4_GROUP_INFO_IBITMAP_CORRUPT) {
809 ret = ext4_test_and_set_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT,
810 &grp->bb_state);
811 if (!ret && gdp) {
812 int count;
813
814 count = ext4_free_inodes_count(sb, gdp);
815 percpu_counter_sub(&sbi->s_freeinodes_counter,
816 count);
817 }
818 }
819 }
820
821 void ext4_update_dynamic_rev(struct super_block *sb)
822 {
823 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
824
825 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
826 return;
827
828 ext4_warning(sb,
829 "updating to rev %d because of new feature flag, "
830 "running e2fsck is recommended",
831 EXT4_DYNAMIC_REV);
832
833 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
834 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
835 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
836 /* leave es->s_feature_*compat flags alone */
837 /* es->s_uuid will be set by e2fsck if empty */
838
839 /*
840 * The rest of the superblock fields should be zero, and if not it
841 * means they are likely already in use, so leave them alone. We
842 * can leave it up to e2fsck to clean up any inconsistencies there.
843 */
844 }
845
846 /*
847 * Open the external journal device
848 */
849 static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb)
850 {
851 struct block_device *bdev;
852 char b[BDEVNAME_SIZE];
853
854 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
855 if (IS_ERR(bdev))
856 goto fail;
857 return bdev;
858
859 fail:
860 ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld",
861 __bdevname(dev, b), PTR_ERR(bdev));
862 return NULL;
863 }
864
865 /*
866 * Release the journal device
867 */
868 static void ext4_blkdev_put(struct block_device *bdev)
869 {
870 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
871 }
872
873 static void ext4_blkdev_remove(struct ext4_sb_info *sbi)
874 {
875 struct block_device *bdev;
876 bdev = sbi->journal_bdev;
877 if (bdev) {
878 ext4_blkdev_put(bdev);
879 sbi->journal_bdev = NULL;
880 }
881 }
882
883 static inline struct inode *orphan_list_entry(struct list_head *l)
884 {
885 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
886 }
887
888 static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
889 {
890 struct list_head *l;
891
892 ext4_msg(sb, KERN_ERR, "sb orphan head is %d",
893 le32_to_cpu(sbi->s_es->s_last_orphan));
894
895 printk(KERN_ERR "sb_info orphan list:\n");
896 list_for_each(l, &sbi->s_orphan) {
897 struct inode *inode = orphan_list_entry(l);
898 printk(KERN_ERR " "
899 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
900 inode->i_sb->s_id, inode->i_ino, inode,
901 inode->i_mode, inode->i_nlink,
902 NEXT_ORPHAN(inode));
903 }
904 }
905
906 #ifdef CONFIG_QUOTA
907 static int ext4_quota_off(struct super_block *sb, int type);
908
909 static inline void ext4_quota_off_umount(struct super_block *sb)
910 {
911 int type;
912
913 /* Use our quota_off function to clear inode flags etc. */
914 for (type = 0; type < EXT4_MAXQUOTAS; type++)
915 ext4_quota_off(sb, type);
916 }
917 #else
918 static inline void ext4_quota_off_umount(struct super_block *sb)
919 {
920 }
921 #endif
922
923 static void ext4_put_super(struct super_block *sb)
924 {
925 struct ext4_sb_info *sbi = EXT4_SB(sb);
926 struct ext4_super_block *es = sbi->s_es;
927 int aborted = 0;
928 int i, err;
929
930 ext4_unregister_li_request(sb);
931 ext4_quota_off_umount(sb);
932
933 destroy_workqueue(sbi->rsv_conversion_wq);
934
935 if (sbi->s_journal) {
936 aborted = is_journal_aborted(sbi->s_journal);
937 err = jbd2_journal_destroy(sbi->s_journal);
938 sbi->s_journal = NULL;
939 if ((err < 0) && !aborted)
940 ext4_abort(sb, "Couldn't clean up the journal");
941 }
942
943 ext4_unregister_sysfs(sb);
944 ext4_es_unregister_shrinker(sbi);
945 del_timer_sync(&sbi->s_err_report);
946 ext4_release_system_zone(sb);
947 ext4_mb_release(sb);
948 ext4_ext_release(sb);
949
950 if (!sb_rdonly(sb) && !aborted) {
951 ext4_clear_feature_journal_needs_recovery(sb);
952 es->s_state = cpu_to_le16(sbi->s_mount_state);
953 }
954 if (!sb_rdonly(sb))
955 ext4_commit_super(sb, 1);
956
957 for (i = 0; i < sbi->s_gdb_count; i++)
958 brelse(sbi->s_group_desc[i]);
959 kvfree(sbi->s_group_desc);
960 kvfree(sbi->s_flex_groups);
961 percpu_counter_destroy(&sbi->s_freeclusters_counter);
962 percpu_counter_destroy(&sbi->s_freeinodes_counter);
963 percpu_counter_destroy(&sbi->s_dirs_counter);
964 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
965 percpu_free_rwsem(&sbi->s_journal_flag_rwsem);
966 #ifdef CONFIG_QUOTA
967 for (i = 0; i < EXT4_MAXQUOTAS; i++)
968 kfree(sbi->s_qf_names[i]);
969 #endif
970
971 /* Debugging code just in case the in-memory inode orphan list
972 * isn't empty. The on-disk one can be non-empty if we've
973 * detected an error and taken the fs readonly, but the
974 * in-memory list had better be clean by this point. */
975 if (!list_empty(&sbi->s_orphan))
976 dump_orphan_list(sb, sbi);
977 J_ASSERT(list_empty(&sbi->s_orphan));
978
979 sync_blockdev(sb->s_bdev);
980 invalidate_bdev(sb->s_bdev);
981 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
982 /*
983 * Invalidate the journal device's buffers. We don't want them
984 * floating about in memory - the physical journal device may
985 * hotswapped, and it breaks the `ro-after' testing code.
986 */
987 sync_blockdev(sbi->journal_bdev);
988 invalidate_bdev(sbi->journal_bdev);
989 ext4_blkdev_remove(sbi);
990 }
991 if (sbi->s_ea_inode_cache) {
992 ext4_xattr_destroy_cache(sbi->s_ea_inode_cache);
993 sbi->s_ea_inode_cache = NULL;
994 }
995 if (sbi->s_ea_block_cache) {
996 ext4_xattr_destroy_cache(sbi->s_ea_block_cache);
997 sbi->s_ea_block_cache = NULL;
998 }
999 if (sbi->s_mmp_tsk)
1000 kthread_stop(sbi->s_mmp_tsk);
1001 brelse(sbi->s_sbh);
1002 sb->s_fs_info = NULL;
1003 /*
1004 * Now that we are completely done shutting down the
1005 * superblock, we need to actually destroy the kobject.
1006 */
1007 kobject_put(&sbi->s_kobj);
1008 wait_for_completion(&sbi->s_kobj_unregister);
1009 if (sbi->s_chksum_driver)
1010 crypto_free_shash(sbi->s_chksum_driver);
1011 kfree(sbi->s_blockgroup_lock);
1012 fs_put_dax(sbi->s_daxdev);
1013 kfree(sbi);
1014 }
1015
1016 static struct kmem_cache *ext4_inode_cachep;
1017
1018 /*
1019 * Called inside transaction, so use GFP_NOFS
1020 */
1021 static struct inode *ext4_alloc_inode(struct super_block *sb)
1022 {
1023 struct ext4_inode_info *ei;
1024
1025 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
1026 if (!ei)
1027 return NULL;
1028
1029 inode_set_iversion(&ei->vfs_inode, 1);
1030 spin_lock_init(&ei->i_raw_lock);
1031 INIT_LIST_HEAD(&ei->i_prealloc_list);
1032 spin_lock_init(&ei->i_prealloc_lock);
1033 ext4_es_init_tree(&ei->i_es_tree);
1034 rwlock_init(&ei->i_es_lock);
1035 INIT_LIST_HEAD(&ei->i_es_list);
1036 ei->i_es_all_nr = 0;
1037 ei->i_es_shk_nr = 0;
1038 ei->i_es_shrink_lblk = 0;
1039 ei->i_reserved_data_blocks = 0;
1040 ei->i_da_metadata_calc_len = 0;
1041 ei->i_da_metadata_calc_last_lblock = 0;
1042 spin_lock_init(&(ei->i_block_reservation_lock));
1043 #ifdef CONFIG_QUOTA
1044 ei->i_reserved_quota = 0;
1045 memset(&ei->i_dquot, 0, sizeof(ei->i_dquot));
1046 #endif
1047 ei->jinode = NULL;
1048 INIT_LIST_HEAD(&ei->i_rsv_conversion_list);
1049 spin_lock_init(&ei->i_completed_io_lock);
1050 ei->i_sync_tid = 0;
1051 ei->i_datasync_tid = 0;
1052 atomic_set(&ei->i_unwritten, 0);
1053 INIT_WORK(&ei->i_rsv_conversion_work, ext4_end_io_rsv_work);
1054 return &ei->vfs_inode;
1055 }
1056
1057 static int ext4_drop_inode(struct inode *inode)
1058 {
1059 int drop = generic_drop_inode(inode);
1060
1061 trace_ext4_drop_inode(inode, drop);
1062 return drop;
1063 }
1064
1065 static void ext4_i_callback(struct rcu_head *head)
1066 {
1067 struct inode *inode = container_of(head, struct inode, i_rcu);
1068 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
1069 }
1070
1071 static void ext4_destroy_inode(struct inode *inode)
1072 {
1073 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
1074 ext4_msg(inode->i_sb, KERN_ERR,
1075 "Inode %lu (%p): orphan list check failed!",
1076 inode->i_ino, EXT4_I(inode));
1077 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
1078 EXT4_I(inode), sizeof(struct ext4_inode_info),
1079 true);
1080 dump_stack();
1081 }
1082 call_rcu(&inode->i_rcu, ext4_i_callback);
1083 }
1084
1085 static void init_once(void *foo)
1086 {
1087 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
1088
1089 INIT_LIST_HEAD(&ei->i_orphan);
1090 init_rwsem(&ei->xattr_sem);
1091 init_rwsem(&ei->i_data_sem);
1092 init_rwsem(&ei->i_mmap_sem);
1093 inode_init_once(&ei->vfs_inode);
1094 }
1095
1096 static int __init init_inodecache(void)
1097 {
1098 ext4_inode_cachep = kmem_cache_create_usercopy("ext4_inode_cache",
1099 sizeof(struct ext4_inode_info), 0,
1100 (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|
1101 SLAB_ACCOUNT),
1102 offsetof(struct ext4_inode_info, i_data),
1103 sizeof_field(struct ext4_inode_info, i_data),
1104 init_once);
1105 if (ext4_inode_cachep == NULL)
1106 return -ENOMEM;
1107 return 0;
1108 }
1109
1110 static void destroy_inodecache(void)
1111 {
1112 /*
1113 * Make sure all delayed rcu free inodes are flushed before we
1114 * destroy cache.
1115 */
1116 rcu_barrier();
1117 kmem_cache_destroy(ext4_inode_cachep);
1118 }
1119
1120 void ext4_clear_inode(struct inode *inode)
1121 {
1122 invalidate_inode_buffers(inode);
1123 clear_inode(inode);
1124 dquot_drop(inode);
1125 ext4_discard_preallocations(inode);
1126 ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS);
1127 if (EXT4_I(inode)->jinode) {
1128 jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode),
1129 EXT4_I(inode)->jinode);
1130 jbd2_free_inode(EXT4_I(inode)->jinode);
1131 EXT4_I(inode)->jinode = NULL;
1132 }
1133 fscrypt_put_encryption_info(inode);
1134 }
1135
1136 static struct inode *ext4_nfs_get_inode(struct super_block *sb,
1137 u64 ino, u32 generation)
1138 {
1139 struct inode *inode;
1140
1141 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
1142 return ERR_PTR(-ESTALE);
1143 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
1144 return ERR_PTR(-ESTALE);
1145
1146 /* iget isn't really right if the inode is currently unallocated!!
1147 *
1148 * ext4_read_inode will return a bad_inode if the inode had been
1149 * deleted, so we should be safe.
1150 *
1151 * Currently we don't know the generation for parent directory, so
1152 * a generation of 0 means "accept any"
1153 */
1154 inode = ext4_iget_normal(sb, ino);
1155 if (IS_ERR(inode))
1156 return ERR_CAST(inode);
1157 if (generation && inode->i_generation != generation) {
1158 iput(inode);
1159 return ERR_PTR(-ESTALE);
1160 }
1161
1162 return inode;
1163 }
1164
1165 static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
1166 int fh_len, int fh_type)
1167 {
1168 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
1169 ext4_nfs_get_inode);
1170 }
1171
1172 static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
1173 int fh_len, int fh_type)
1174 {
1175 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
1176 ext4_nfs_get_inode);
1177 }
1178
1179 /*
1180 * Try to release metadata pages (indirect blocks, directories) which are
1181 * mapped via the block device. Since these pages could have journal heads
1182 * which would prevent try_to_free_buffers() from freeing them, we must use
1183 * jbd2 layer's try_to_free_buffers() function to release them.
1184 */
1185 static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
1186 gfp_t wait)
1187 {
1188 journal_t *journal = EXT4_SB(sb)->s_journal;
1189
1190 WARN_ON(PageChecked(page));
1191 if (!page_has_buffers(page))
1192 return 0;
1193 if (journal)
1194 return jbd2_journal_try_to_free_buffers(journal, page,
1195 wait & ~__GFP_DIRECT_RECLAIM);
1196 return try_to_free_buffers(page);
1197 }
1198
1199 #ifdef CONFIG_EXT4_FS_ENCRYPTION
1200 static int ext4_get_context(struct inode *inode, void *ctx, size_t len)
1201 {
1202 return ext4_xattr_get(inode, EXT4_XATTR_INDEX_ENCRYPTION,
1203 EXT4_XATTR_NAME_ENCRYPTION_CONTEXT, ctx, len);
1204 }
1205
1206 static int ext4_set_context(struct inode *inode, const void *ctx, size_t len,
1207 void *fs_data)
1208 {
1209 handle_t *handle = fs_data;
1210 int res, res2, credits, retries = 0;
1211
1212 /*
1213 * Encrypting the root directory is not allowed because e2fsck expects
1214 * lost+found to exist and be unencrypted, and encrypting the root
1215 * directory would imply encrypting the lost+found directory as well as
1216 * the filename "lost+found" itself.
1217 */
1218 if (inode->i_ino == EXT4_ROOT_INO)
1219 return -EPERM;
1220
1221 if (WARN_ON_ONCE(IS_DAX(inode) && i_size_read(inode)))
1222 return -EINVAL;
1223
1224 res = ext4_convert_inline_data(inode);
1225 if (res)
1226 return res;
1227
1228 /*
1229 * If a journal handle was specified, then the encryption context is
1230 * being set on a new inode via inheritance and is part of a larger
1231 * transaction to create the inode. Otherwise the encryption context is
1232 * being set on an existing inode in its own transaction. Only in the
1233 * latter case should the "retry on ENOSPC" logic be used.
1234 */
1235
1236 if (handle) {
1237 res = ext4_xattr_set_handle(handle, inode,
1238 EXT4_XATTR_INDEX_ENCRYPTION,
1239 EXT4_XATTR_NAME_ENCRYPTION_CONTEXT,
1240 ctx, len, 0);
1241 if (!res) {
1242 ext4_set_inode_flag(inode, EXT4_INODE_ENCRYPT);
1243 ext4_clear_inode_state(inode,
1244 EXT4_STATE_MAY_INLINE_DATA);
1245 /*
1246 * Update inode->i_flags - S_ENCRYPTED will be enabled,
1247 * S_DAX may be disabled
1248 */
1249 ext4_set_inode_flags(inode);
1250 }
1251 return res;
1252 }
1253
1254 res = dquot_initialize(inode);
1255 if (res)
1256 return res;
1257 retry:
1258 res = ext4_xattr_set_credits(inode, len, false /* is_create */,
1259 &credits);
1260 if (res)
1261 return res;
1262
1263 handle = ext4_journal_start(inode, EXT4_HT_MISC, credits);
1264 if (IS_ERR(handle))
1265 return PTR_ERR(handle);
1266
1267 res = ext4_xattr_set_handle(handle, inode, EXT4_XATTR_INDEX_ENCRYPTION,
1268 EXT4_XATTR_NAME_ENCRYPTION_CONTEXT,
1269 ctx, len, 0);
1270 if (!res) {
1271 ext4_set_inode_flag(inode, EXT4_INODE_ENCRYPT);
1272 /*
1273 * Update inode->i_flags - S_ENCRYPTED will be enabled,
1274 * S_DAX may be disabled
1275 */
1276 ext4_set_inode_flags(inode);
1277 res = ext4_mark_inode_dirty(handle, inode);
1278 if (res)
1279 EXT4_ERROR_INODE(inode, "Failed to mark inode dirty");
1280 }
1281 res2 = ext4_journal_stop(handle);
1282
1283 if (res == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
1284 goto retry;
1285 if (!res)
1286 res = res2;
1287 return res;
1288 }
1289
1290 static bool ext4_dummy_context(struct inode *inode)
1291 {
1292 return DUMMY_ENCRYPTION_ENABLED(EXT4_SB(inode->i_sb));
1293 }
1294
1295 static const struct fscrypt_operations ext4_cryptops = {
1296 .key_prefix = "ext4:",
1297 .get_context = ext4_get_context,
1298 .set_context = ext4_set_context,
1299 .dummy_context = ext4_dummy_context,
1300 .empty_dir = ext4_empty_dir,
1301 .max_namelen = EXT4_NAME_LEN,
1302 };
1303 #endif
1304
1305 #ifdef CONFIG_QUOTA
1306 static const char * const quotatypes[] = INITQFNAMES;
1307 #define QTYPE2NAME(t) (quotatypes[t])
1308
1309 static int ext4_write_dquot(struct dquot *dquot);
1310 static int ext4_acquire_dquot(struct dquot *dquot);
1311 static int ext4_release_dquot(struct dquot *dquot);
1312 static int ext4_mark_dquot_dirty(struct dquot *dquot);
1313 static int ext4_write_info(struct super_block *sb, int type);
1314 static int ext4_quota_on(struct super_block *sb, int type, int format_id,
1315 const struct path *path);
1316 static int ext4_quota_on_mount(struct super_block *sb, int type);
1317 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
1318 size_t len, loff_t off);
1319 static ssize_t ext4_quota_write(struct super_block *sb, int type,
1320 const char *data, size_t len, loff_t off);
1321 static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
1322 unsigned int flags);
1323 static int ext4_enable_quotas(struct super_block *sb);
1324 static int ext4_get_next_id(struct super_block *sb, struct kqid *qid);
1325
1326 static struct dquot **ext4_get_dquots(struct inode *inode)
1327 {
1328 return EXT4_I(inode)->i_dquot;
1329 }
1330
1331 static const struct dquot_operations ext4_quota_operations = {
1332 .get_reserved_space = ext4_get_reserved_space,
1333 .write_dquot = ext4_write_dquot,
1334 .acquire_dquot = ext4_acquire_dquot,
1335 .release_dquot = ext4_release_dquot,
1336 .mark_dirty = ext4_mark_dquot_dirty,
1337 .write_info = ext4_write_info,
1338 .alloc_dquot = dquot_alloc,
1339 .destroy_dquot = dquot_destroy,
1340 .get_projid = ext4_get_projid,
1341 .get_inode_usage = ext4_get_inode_usage,
1342 .get_next_id = ext4_get_next_id,
1343 };
1344
1345 static const struct quotactl_ops ext4_qctl_operations = {
1346 .quota_on = ext4_quota_on,
1347 .quota_off = ext4_quota_off,
1348 .quota_sync = dquot_quota_sync,
1349 .get_state = dquot_get_state,
1350 .set_info = dquot_set_dqinfo,
1351 .get_dqblk = dquot_get_dqblk,
1352 .set_dqblk = dquot_set_dqblk,
1353 .get_nextdqblk = dquot_get_next_dqblk,
1354 };
1355 #endif
1356
1357 static const struct super_operations ext4_sops = {
1358 .alloc_inode = ext4_alloc_inode,
1359 .destroy_inode = ext4_destroy_inode,
1360 .write_inode = ext4_write_inode,
1361 .dirty_inode = ext4_dirty_inode,
1362 .drop_inode = ext4_drop_inode,
1363 .evict_inode = ext4_evict_inode,
1364 .put_super = ext4_put_super,
1365 .sync_fs = ext4_sync_fs,
1366 .freeze_fs = ext4_freeze,
1367 .unfreeze_fs = ext4_unfreeze,
1368 .statfs = ext4_statfs,
1369 .remount_fs = ext4_remount,
1370 .show_options = ext4_show_options,
1371 #ifdef CONFIG_QUOTA
1372 .quota_read = ext4_quota_read,
1373 .quota_write = ext4_quota_write,
1374 .get_dquots = ext4_get_dquots,
1375 #endif
1376 .bdev_try_to_free_page = bdev_try_to_free_page,
1377 };
1378
1379 static const struct export_operations ext4_export_ops = {
1380 .fh_to_dentry = ext4_fh_to_dentry,
1381 .fh_to_parent = ext4_fh_to_parent,
1382 .get_parent = ext4_get_parent,
1383 };
1384
1385 enum {
1386 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
1387 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
1388 Opt_nouid32, Opt_debug, Opt_removed,
1389 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
1390 Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload,
1391 Opt_commit, Opt_min_batch_time, Opt_max_batch_time, Opt_journal_dev,
1392 Opt_journal_path, Opt_journal_checksum, Opt_journal_async_commit,
1393 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
1394 Opt_data_err_abort, Opt_data_err_ignore, Opt_test_dummy_encryption,
1395 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
1396 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
1397 Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err,
1398 Opt_usrquota, Opt_grpquota, Opt_prjquota, Opt_i_version, Opt_dax,
1399 Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_warn_on_error,
1400 Opt_nowarn_on_error, Opt_mblk_io_submit,
1401 Opt_lazytime, Opt_nolazytime, Opt_debug_want_extra_isize,
1402 Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity,
1403 Opt_inode_readahead_blks, Opt_journal_ioprio,
1404 Opt_dioread_nolock, Opt_dioread_lock,
1405 Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable,
1406 Opt_max_dir_size_kb, Opt_nojournal_checksum, Opt_nombcache,
1407 };
1408
1409 static const match_table_t tokens = {
1410 {Opt_bsd_df, "bsddf"},
1411 {Opt_minix_df, "minixdf"},
1412 {Opt_grpid, "grpid"},
1413 {Opt_grpid, "bsdgroups"},
1414 {Opt_nogrpid, "nogrpid"},
1415 {Opt_nogrpid, "sysvgroups"},
1416 {Opt_resgid, "resgid=%u"},
1417 {Opt_resuid, "resuid=%u"},
1418 {Opt_sb, "sb=%u"},
1419 {Opt_err_cont, "errors=continue"},
1420 {Opt_err_panic, "errors=panic"},
1421 {Opt_err_ro, "errors=remount-ro"},
1422 {Opt_nouid32, "nouid32"},
1423 {Opt_debug, "debug"},
1424 {Opt_removed, "oldalloc"},
1425 {Opt_removed, "orlov"},
1426 {Opt_user_xattr, "user_xattr"},
1427 {Opt_nouser_xattr, "nouser_xattr"},
1428 {Opt_acl, "acl"},
1429 {Opt_noacl, "noacl"},
1430 {Opt_noload, "norecovery"},
1431 {Opt_noload, "noload"},
1432 {Opt_removed, "nobh"},
1433 {Opt_removed, "bh"},
1434 {Opt_commit, "commit=%u"},
1435 {Opt_min_batch_time, "min_batch_time=%u"},
1436 {Opt_max_batch_time, "max_batch_time=%u"},
1437 {Opt_journal_dev, "journal_dev=%u"},
1438 {Opt_journal_path, "journal_path=%s"},
1439 {Opt_journal_checksum, "journal_checksum"},
1440 {Opt_nojournal_checksum, "nojournal_checksum"},
1441 {Opt_journal_async_commit, "journal_async_commit"},
1442 {Opt_abort, "abort"},
1443 {Opt_data_journal, "data=journal"},
1444 {Opt_data_ordered, "data=ordered"},
1445 {Opt_data_writeback, "data=writeback"},
1446 {Opt_data_err_abort, "data_err=abort"},
1447 {Opt_data_err_ignore, "data_err=ignore"},
1448 {Opt_offusrjquota, "usrjquota="},
1449 {Opt_usrjquota, "usrjquota=%s"},
1450 {Opt_offgrpjquota, "grpjquota="},
1451 {Opt_grpjquota, "grpjquota=%s"},
1452 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
1453 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
1454 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
1455 {Opt_grpquota, "grpquota"},
1456 {Opt_noquota, "noquota"},
1457 {Opt_quota, "quota"},
1458 {Opt_usrquota, "usrquota"},
1459 {Opt_prjquota, "prjquota"},
1460 {Opt_barrier, "barrier=%u"},
1461 {Opt_barrier, "barrier"},
1462 {Opt_nobarrier, "nobarrier"},
1463 {Opt_i_version, "i_version"},
1464 {Opt_dax, "dax"},
1465 {Opt_stripe, "stripe=%u"},
1466 {Opt_delalloc, "delalloc"},
1467 {Opt_warn_on_error, "warn_on_error"},
1468 {Opt_nowarn_on_error, "nowarn_on_error"},
1469 {Opt_lazytime, "lazytime"},
1470 {Opt_nolazytime, "nolazytime"},
1471 {Opt_debug_want_extra_isize, "debug_want_extra_isize=%u"},
1472 {Opt_nodelalloc, "nodelalloc"},
1473 {Opt_removed, "mblk_io_submit"},
1474 {Opt_removed, "nomblk_io_submit"},
1475 {Opt_block_validity, "block_validity"},
1476 {Opt_noblock_validity, "noblock_validity"},
1477 {Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
1478 {Opt_journal_ioprio, "journal_ioprio=%u"},
1479 {Opt_auto_da_alloc, "auto_da_alloc=%u"},
1480 {Opt_auto_da_alloc, "auto_da_alloc"},
1481 {Opt_noauto_da_alloc, "noauto_da_alloc"},
1482 {Opt_dioread_nolock, "dioread_nolock"},
1483 {Opt_dioread_lock, "dioread_lock"},
1484 {Opt_discard, "discard"},
1485 {Opt_nodiscard, "nodiscard"},
1486 {Opt_init_itable, "init_itable=%u"},
1487 {Opt_init_itable, "init_itable"},
1488 {Opt_noinit_itable, "noinit_itable"},
1489 {Opt_max_dir_size_kb, "max_dir_size_kb=%u"},
1490 {Opt_test_dummy_encryption, "test_dummy_encryption"},
1491 {Opt_nombcache, "nombcache"},
1492 {Opt_nombcache, "no_mbcache"}, /* for backward compatibility */
1493 {Opt_removed, "check=none"}, /* mount option from ext2/3 */
1494 {Opt_removed, "nocheck"}, /* mount option from ext2/3 */
1495 {Opt_removed, "reservation"}, /* mount option from ext2/3 */
1496 {Opt_removed, "noreservation"}, /* mount option from ext2/3 */
1497 {Opt_removed, "journal=%u"}, /* mount option from ext2/3 */
1498 {Opt_err, NULL},
1499 };
1500
1501 static ext4_fsblk_t get_sb_block(void **data)
1502 {
1503 ext4_fsblk_t sb_block;
1504 char *options = (char *) *data;
1505
1506 if (!options || strncmp(options, "sb=", 3) != 0)
1507 return 1; /* Default location */
1508
1509 options += 3;
1510 /* TODO: use simple_strtoll with >32bit ext4 */
1511 sb_block = simple_strtoul(options, &options, 0);
1512 if (*options && *options != ',') {
1513 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
1514 (char *) *data);
1515 return 1;
1516 }
1517 if (*options == ',')
1518 options++;
1519 *data = (void *) options;
1520
1521 return sb_block;
1522 }
1523
1524 #define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
1525 static const char deprecated_msg[] =
1526 "Mount option \"%s\" will be removed by %s\n"
1527 "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
1528
1529 #ifdef CONFIG_QUOTA
1530 static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
1531 {
1532 struct ext4_sb_info *sbi = EXT4_SB(sb);
1533 char *qname;
1534 int ret = -1;
1535
1536 if (sb_any_quota_loaded(sb) &&
1537 !sbi->s_qf_names[qtype]) {
1538 ext4_msg(sb, KERN_ERR,
1539 "Cannot change journaled "
1540 "quota options when quota turned on");
1541 return -1;
1542 }
1543 if (ext4_has_feature_quota(sb)) {
1544 ext4_msg(sb, KERN_INFO, "Journaled quota options "
1545 "ignored when QUOTA feature is enabled");
1546 return 1;
1547 }
1548 qname = match_strdup(args);
1549 if (!qname) {
1550 ext4_msg(sb, KERN_ERR,
1551 "Not enough memory for storing quotafile name");
1552 return -1;
1553 }
1554 if (sbi->s_qf_names[qtype]) {
1555 if (strcmp(sbi->s_qf_names[qtype], qname) == 0)
1556 ret = 1;
1557 else
1558 ext4_msg(sb, KERN_ERR,
1559 "%s quota file already specified",
1560 QTYPE2NAME(qtype));
1561 goto errout;
1562 }
1563 if (strchr(qname, '/')) {
1564 ext4_msg(sb, KERN_ERR,
1565 "quotafile must be on filesystem root");
1566 goto errout;
1567 }
1568 sbi->s_qf_names[qtype] = qname;
1569 set_opt(sb, QUOTA);
1570 return 1;
1571 errout:
1572 kfree(qname);
1573 return ret;
1574 }
1575
1576 static int clear_qf_name(struct super_block *sb, int qtype)
1577 {
1578
1579 struct ext4_sb_info *sbi = EXT4_SB(sb);
1580
1581 if (sb_any_quota_loaded(sb) &&
1582 sbi->s_qf_names[qtype]) {
1583 ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options"
1584 " when quota turned on");
1585 return -1;
1586 }
1587 kfree(sbi->s_qf_names[qtype]);
1588 sbi->s_qf_names[qtype] = NULL;
1589 return 1;
1590 }
1591 #endif
1592
1593 #define MOPT_SET 0x0001
1594 #define MOPT_CLEAR 0x0002
1595 #define MOPT_NOSUPPORT 0x0004
1596 #define MOPT_EXPLICIT 0x0008
1597 #define MOPT_CLEAR_ERR 0x0010
1598 #define MOPT_GTE0 0x0020
1599 #ifdef CONFIG_QUOTA
1600 #define MOPT_Q 0
1601 #define MOPT_QFMT 0x0040
1602 #else
1603 #define MOPT_Q MOPT_NOSUPPORT
1604 #define MOPT_QFMT MOPT_NOSUPPORT
1605 #endif
1606 #define MOPT_DATAJ 0x0080
1607 #define MOPT_NO_EXT2 0x0100
1608 #define MOPT_NO_EXT3 0x0200
1609 #define MOPT_EXT4_ONLY (MOPT_NO_EXT2 | MOPT_NO_EXT3)
1610 #define MOPT_STRING 0x0400
1611
1612 static const struct mount_opts {
1613 int token;
1614 int mount_opt;
1615 int flags;
1616 } ext4_mount_opts[] = {
1617 {Opt_minix_df, EXT4_MOUNT_MINIX_DF, MOPT_SET},
1618 {Opt_bsd_df, EXT4_MOUNT_MINIX_DF, MOPT_CLEAR},
1619 {Opt_grpid, EXT4_MOUNT_GRPID, MOPT_SET},
1620 {Opt_nogrpid, EXT4_MOUNT_GRPID, MOPT_CLEAR},
1621 {Opt_block_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_SET},
1622 {Opt_noblock_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_CLEAR},
1623 {Opt_dioread_nolock, EXT4_MOUNT_DIOREAD_NOLOCK,
1624 MOPT_EXT4_ONLY | MOPT_SET},
1625 {Opt_dioread_lock, EXT4_MOUNT_DIOREAD_NOLOCK,
1626 MOPT_EXT4_ONLY | MOPT_CLEAR},
1627 {Opt_discard, EXT4_MOUNT_DISCARD, MOPT_SET},
1628 {Opt_nodiscard, EXT4_MOUNT_DISCARD, MOPT_CLEAR},
1629 {Opt_delalloc, EXT4_MOUNT_DELALLOC,
1630 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
1631 {Opt_nodelalloc, EXT4_MOUNT_DELALLOC,
1632 MOPT_EXT4_ONLY | MOPT_CLEAR},
1633 {Opt_warn_on_error, EXT4_MOUNT_WARN_ON_ERROR, MOPT_SET},
1634 {Opt_nowarn_on_error, EXT4_MOUNT_WARN_ON_ERROR, MOPT_CLEAR},
1635 {Opt_nojournal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
1636 MOPT_EXT4_ONLY | MOPT_CLEAR},
1637 {Opt_journal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
1638 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
1639 {Opt_journal_async_commit, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT |
1640 EXT4_MOUNT_JOURNAL_CHECKSUM),
1641 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
1642 {Opt_noload, EXT4_MOUNT_NOLOAD, MOPT_NO_EXT2 | MOPT_SET},
1643 {Opt_err_panic, EXT4_MOUNT_ERRORS_PANIC, MOPT_SET | MOPT_CLEAR_ERR},
1644 {Opt_err_ro, EXT4_MOUNT_ERRORS_RO, MOPT_SET | MOPT_CLEAR_ERR},
1645 {Opt_err_cont, EXT4_MOUNT_ERRORS_CONT, MOPT_SET | MOPT_CLEAR_ERR},
1646 {Opt_data_err_abort, EXT4_MOUNT_DATA_ERR_ABORT,
1647 MOPT_NO_EXT2},
1648 {Opt_data_err_ignore, EXT4_MOUNT_DATA_ERR_ABORT,
1649 MOPT_NO_EXT2},
1650 {Opt_barrier, EXT4_MOUNT_BARRIER, MOPT_SET},
1651 {Opt_nobarrier, EXT4_MOUNT_BARRIER, MOPT_CLEAR},
1652 {Opt_noauto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_SET},
1653 {Opt_auto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_CLEAR},
1654 {Opt_noinit_itable, EXT4_MOUNT_INIT_INODE_TABLE, MOPT_CLEAR},
1655 {Opt_commit, 0, MOPT_GTE0},
1656 {Opt_max_batch_time, 0, MOPT_GTE0},
1657 {Opt_min_batch_time, 0, MOPT_GTE0},
1658 {Opt_inode_readahead_blks, 0, MOPT_GTE0},
1659 {Opt_init_itable, 0, MOPT_GTE0},
1660 {Opt_dax, EXT4_MOUNT_DAX, MOPT_SET},
1661 {Opt_stripe, 0, MOPT_GTE0},
1662 {Opt_resuid, 0, MOPT_GTE0},
1663 {Opt_resgid, 0, MOPT_GTE0},
1664 {Opt_journal_dev, 0, MOPT_NO_EXT2 | MOPT_GTE0},
1665 {Opt_journal_path, 0, MOPT_NO_EXT2 | MOPT_STRING},
1666 {Opt_journal_ioprio, 0, MOPT_NO_EXT2 | MOPT_GTE0},
1667 {Opt_data_journal, EXT4_MOUNT_JOURNAL_DATA, MOPT_NO_EXT2 | MOPT_DATAJ},
1668 {Opt_data_ordered, EXT4_MOUNT_ORDERED_DATA, MOPT_NO_EXT2 | MOPT_DATAJ},
1669 {Opt_data_writeback, EXT4_MOUNT_WRITEBACK_DATA,
1670 MOPT_NO_EXT2 | MOPT_DATAJ},
1671 {Opt_user_xattr, EXT4_MOUNT_XATTR_USER, MOPT_SET},
1672 {Opt_nouser_xattr, EXT4_MOUNT_XATTR_USER, MOPT_CLEAR},
1673 #ifdef CONFIG_EXT4_FS_POSIX_ACL
1674 {Opt_acl, EXT4_MOUNT_POSIX_ACL, MOPT_SET},
1675 {Opt_noacl, EXT4_MOUNT_POSIX_ACL, MOPT_CLEAR},
1676 #else
1677 {Opt_acl, 0, MOPT_NOSUPPORT},
1678 {Opt_noacl, 0, MOPT_NOSUPPORT},
1679 #endif
1680 {Opt_nouid32, EXT4_MOUNT_NO_UID32, MOPT_SET},
1681 {Opt_debug, EXT4_MOUNT_DEBUG, MOPT_SET},
1682 {Opt_debug_want_extra_isize, 0, MOPT_GTE0},
1683 {Opt_quota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA, MOPT_SET | MOPT_Q},
1684 {Opt_usrquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA,
1685 MOPT_SET | MOPT_Q},
1686 {Opt_grpquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_GRPQUOTA,
1687 MOPT_SET | MOPT_Q},
1688 {Opt_prjquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_PRJQUOTA,
1689 MOPT_SET | MOPT_Q},
1690 {Opt_noquota, (EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA |
1691 EXT4_MOUNT_GRPQUOTA | EXT4_MOUNT_PRJQUOTA),
1692 MOPT_CLEAR | MOPT_Q},
1693 {Opt_usrjquota, 0, MOPT_Q},
1694 {Opt_grpjquota, 0, MOPT_Q},
1695 {Opt_offusrjquota, 0, MOPT_Q},
1696 {Opt_offgrpjquota, 0, MOPT_Q},
1697 {Opt_jqfmt_vfsold, QFMT_VFS_OLD, MOPT_QFMT},
1698 {Opt_jqfmt_vfsv0, QFMT_VFS_V0, MOPT_QFMT},
1699 {Opt_jqfmt_vfsv1, QFMT_VFS_V1, MOPT_QFMT},
1700 {Opt_max_dir_size_kb, 0, MOPT_GTE0},
1701 {Opt_test_dummy_encryption, 0, MOPT_GTE0},
1702 {Opt_nombcache, EXT4_MOUNT_NO_MBCACHE, MOPT_SET},
1703 {Opt_err, 0, 0}
1704 };
1705
1706 static int handle_mount_opt(struct super_block *sb, char *opt, int token,
1707 substring_t *args, unsigned long *journal_devnum,
1708 unsigned int *journal_ioprio, int is_remount)
1709 {
1710 struct ext4_sb_info *sbi = EXT4_SB(sb);
1711 const struct mount_opts *m;
1712 kuid_t uid;
1713 kgid_t gid;
1714 int arg = 0;
1715
1716 #ifdef CONFIG_QUOTA
1717 if (token == Opt_usrjquota)
1718 return set_qf_name(sb, USRQUOTA, &args[0]);
1719 else if (token == Opt_grpjquota)
1720 return set_qf_name(sb, GRPQUOTA, &args[0]);
1721 else if (token == Opt_offusrjquota)
1722 return clear_qf_name(sb, USRQUOTA);
1723 else if (token == Opt_offgrpjquota)
1724 return clear_qf_name(sb, GRPQUOTA);
1725 #endif
1726 switch (token) {
1727 case Opt_noacl:
1728 case Opt_nouser_xattr:
1729 ext4_msg(sb, KERN_WARNING, deprecated_msg, opt, "3.5");
1730 break;
1731 case Opt_sb:
1732 return 1; /* handled by get_sb_block() */
1733 case Opt_removed:
1734 ext4_msg(sb, KERN_WARNING, "Ignoring removed %s option", opt);
1735 return 1;
1736 case Opt_abort:
1737 sbi->s_mount_flags |= EXT4_MF_FS_ABORTED;
1738 return 1;
1739 case Opt_i_version:
1740 sb->s_flags |= SB_I_VERSION;
1741 return 1;
1742 case Opt_lazytime:
1743 sb->s_flags |= SB_LAZYTIME;
1744 return 1;
1745 case Opt_nolazytime:
1746 sb->s_flags &= ~SB_LAZYTIME;
1747 return 1;
1748 }
1749
1750 for (m = ext4_mount_opts; m->token != Opt_err; m++)
1751 if (token == m->token)
1752 break;
1753
1754 if (m->token == Opt_err) {
1755 ext4_msg(sb, KERN_ERR, "Unrecognized mount option \"%s\" "
1756 "or missing value", opt);
1757 return -1;
1758 }
1759
1760 if ((m->flags & MOPT_NO_EXT2) && IS_EXT2_SB(sb)) {
1761 ext4_msg(sb, KERN_ERR,
1762 "Mount option \"%s\" incompatible with ext2", opt);
1763 return -1;
1764 }
1765 if ((m->flags & MOPT_NO_EXT3) && IS_EXT3_SB(sb)) {
1766 ext4_msg(sb, KERN_ERR,
1767 "Mount option \"%s\" incompatible with ext3", opt);
1768 return -1;
1769 }
1770
1771 if (args->from && !(m->flags & MOPT_STRING) && match_int(args, &arg))
1772 return -1;
1773 if (args->from && (m->flags & MOPT_GTE0) && (arg < 0))
1774 return -1;
1775 if (m->flags & MOPT_EXPLICIT) {
1776 if (m->mount_opt & EXT4_MOUNT_DELALLOC) {
1777 set_opt2(sb, EXPLICIT_DELALLOC);
1778 } else if (m->mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) {
1779 set_opt2(sb, EXPLICIT_JOURNAL_CHECKSUM);
1780 } else
1781 return -1;
1782 }
1783 if (m->flags & MOPT_CLEAR_ERR)
1784 clear_opt(sb, ERRORS_MASK);
1785 if (token == Opt_noquota && sb_any_quota_loaded(sb)) {
1786 ext4_msg(sb, KERN_ERR, "Cannot change quota "
1787 "options when quota turned on");
1788 return -1;
1789 }
1790
1791 if (m->flags & MOPT_NOSUPPORT) {
1792 ext4_msg(sb, KERN_ERR, "%s option not supported", opt);
1793 } else if (token == Opt_commit) {
1794 if (arg == 0)
1795 arg = JBD2_DEFAULT_MAX_COMMIT_AGE;
1796 sbi->s_commit_interval = HZ * arg;
1797 } else if (token == Opt_debug_want_extra_isize) {
1798 sbi->s_want_extra_isize = arg;
1799 } else if (token == Opt_max_batch_time) {
1800 sbi->s_max_batch_time = arg;
1801 } else if (token == Opt_min_batch_time) {
1802 sbi->s_min_batch_time = arg;
1803 } else if (token == Opt_inode_readahead_blks) {
1804 if (arg && (arg > (1 << 30) || !is_power_of_2(arg))) {
1805 ext4_msg(sb, KERN_ERR,
1806 "EXT4-fs: inode_readahead_blks must be "
1807 "0 or a power of 2 smaller than 2^31");
1808 return -1;
1809 }
1810 sbi->s_inode_readahead_blks = arg;
1811 } else if (token == Opt_init_itable) {
1812 set_opt(sb, INIT_INODE_TABLE);
1813 if (!args->from)
1814 arg = EXT4_DEF_LI_WAIT_MULT;
1815 sbi->s_li_wait_mult = arg;
1816 } else if (token == Opt_max_dir_size_kb) {
1817 sbi->s_max_dir_size_kb = arg;
1818 } else if (token == Opt_stripe) {
1819 sbi->s_stripe = arg;
1820 } else if (token == Opt_resuid) {
1821 uid = make_kuid(current_user_ns(), arg);
1822 if (!uid_valid(uid)) {
1823 ext4_msg(sb, KERN_ERR, "Invalid uid value %d", arg);
1824 return -1;
1825 }
1826 sbi->s_resuid = uid;
1827 } else if (token == Opt_resgid) {
1828 gid = make_kgid(current_user_ns(), arg);
1829 if (!gid_valid(gid)) {
1830 ext4_msg(sb, KERN_ERR, "Invalid gid value %d", arg);
1831 return -1;
1832 }
1833 sbi->s_resgid = gid;
1834 } else if (token == Opt_journal_dev) {
1835 if (is_remount) {
1836 ext4_msg(sb, KERN_ERR,
1837 "Cannot specify journal on remount");
1838 return -1;
1839 }
1840 *journal_devnum = arg;
1841 } else if (token == Opt_journal_path) {
1842 char *journal_path;
1843 struct inode *journal_inode;
1844 struct path path;
1845 int error;
1846
1847 if (is_remount) {
1848 ext4_msg(sb, KERN_ERR,
1849 "Cannot specify journal on remount");
1850 return -1;
1851 }
1852 journal_path = match_strdup(&args[0]);
1853 if (!journal_path) {
1854 ext4_msg(sb, KERN_ERR, "error: could not dup "
1855 "journal device string");
1856 return -1;
1857 }
1858
1859 error = kern_path(journal_path, LOOKUP_FOLLOW, &path);
1860 if (error) {
1861 ext4_msg(sb, KERN_ERR, "error: could not find "
1862 "journal device path: error %d", error);
1863 kfree(journal_path);
1864 return -1;
1865 }
1866
1867 journal_inode = d_inode(path.dentry);
1868 if (!S_ISBLK(journal_inode->i_mode)) {
1869 ext4_msg(sb, KERN_ERR, "error: journal path %s "
1870 "is not a block device", journal_path);
1871 path_put(&path);
1872 kfree(journal_path);
1873 return -1;
1874 }
1875
1876 *journal_devnum = new_encode_dev(journal_inode->i_rdev);
1877 path_put(&path);
1878 kfree(journal_path);
1879 } else if (token == Opt_journal_ioprio) {
1880 if (arg > 7) {
1881 ext4_msg(sb, KERN_ERR, "Invalid journal IO priority"
1882 " (must be 0-7)");
1883 return -1;
1884 }
1885 *journal_ioprio =
1886 IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, arg);
1887 } else if (token == Opt_test_dummy_encryption) {
1888 #ifdef CONFIG_EXT4_FS_ENCRYPTION
1889 sbi->s_mount_flags |= EXT4_MF_TEST_DUMMY_ENCRYPTION;
1890 ext4_msg(sb, KERN_WARNING,
1891 "Test dummy encryption mode enabled");
1892 #else
1893 ext4_msg(sb, KERN_WARNING,
1894 "Test dummy encryption mount option ignored");
1895 #endif
1896 } else if (m->flags & MOPT_DATAJ) {
1897 if (is_remount) {
1898 if (!sbi->s_journal)
1899 ext4_msg(sb, KERN_WARNING, "Remounting file system with no journal so ignoring journalled data option");
1900 else if (test_opt(sb, DATA_FLAGS) != m->mount_opt) {
1901 ext4_msg(sb, KERN_ERR,
1902 "Cannot change data mode on remount");
1903 return -1;
1904 }
1905 } else {
1906 clear_opt(sb, DATA_FLAGS);
1907 sbi->s_mount_opt |= m->mount_opt;
1908 }
1909 #ifdef CONFIG_QUOTA
1910 } else if (m->flags & MOPT_QFMT) {
1911 if (sb_any_quota_loaded(sb) &&
1912 sbi->s_jquota_fmt != m->mount_opt) {
1913 ext4_msg(sb, KERN_ERR, "Cannot change journaled "
1914 "quota options when quota turned on");
1915 return -1;
1916 }
1917 if (ext4_has_feature_quota(sb)) {
1918 ext4_msg(sb, KERN_INFO,
1919 "Quota format mount options ignored "
1920 "when QUOTA feature is enabled");
1921 return 1;
1922 }
1923 sbi->s_jquota_fmt = m->mount_opt;
1924 #endif
1925 } else if (token == Opt_dax) {
1926 #ifdef CONFIG_FS_DAX
1927 ext4_msg(sb, KERN_WARNING,
1928 "DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
1929 sbi->s_mount_opt |= m->mount_opt;
1930 #else
1931 ext4_msg(sb, KERN_INFO, "dax option not supported");
1932 return -1;
1933 #endif
1934 } else if (token == Opt_data_err_abort) {
1935 sbi->s_mount_opt |= m->mount_opt;
1936 } else if (token == Opt_data_err_ignore) {
1937 sbi->s_mount_opt &= ~m->mount_opt;
1938 } else {
1939 if (!args->from)
1940 arg = 1;
1941 if (m->flags & MOPT_CLEAR)
1942 arg = !arg;
1943 else if (unlikely(!(m->flags & MOPT_SET))) {
1944 ext4_msg(sb, KERN_WARNING,
1945 "buggy handling of option %s", opt);
1946 WARN_ON(1);
1947 return -1;
1948 }
1949 if (arg != 0)
1950 sbi->s_mount_opt |= m->mount_opt;
1951 else
1952 sbi->s_mount_opt &= ~m->mount_opt;
1953 }
1954 return 1;
1955 }
1956
1957 static int parse_options(char *options, struct super_block *sb,
1958 unsigned long *journal_devnum,
1959 unsigned int *journal_ioprio,
1960 int is_remount)
1961 {
1962 struct ext4_sb_info *sbi = EXT4_SB(sb);
1963 char *p;
1964 substring_t args[MAX_OPT_ARGS];
1965 int token;
1966
1967 if (!options)
1968 return 1;
1969
1970 while ((p = strsep(&options, ",")) != NULL) {
1971 if (!*p)
1972 continue;
1973 /*
1974 * Initialize args struct so we know whether arg was
1975 * found; some options take optional arguments.
1976 */
1977 args[0].to = args[0].from = NULL;
1978 token = match_token(p, tokens, args);
1979 if (handle_mount_opt(sb, p, token, args, journal_devnum,
1980 journal_ioprio, is_remount) < 0)
1981 return 0;
1982 }
1983 #ifdef CONFIG_QUOTA
1984 /*
1985 * We do the test below only for project quotas. 'usrquota' and
1986 * 'grpquota' mount options are allowed even without quota feature
1987 * to support legacy quotas in quota files.
1988 */
1989 if (test_opt(sb, PRJQUOTA) && !ext4_has_feature_project(sb)) {
1990 ext4_msg(sb, KERN_ERR, "Project quota feature not enabled. "
1991 "Cannot enable project quota enforcement.");
1992 return 0;
1993 }
1994 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1995 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
1996 clear_opt(sb, USRQUOTA);
1997
1998 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
1999 clear_opt(sb, GRPQUOTA);
2000
2001 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
2002 ext4_msg(sb, KERN_ERR, "old and new quota "
2003 "format mixing");
2004 return 0;
2005 }
2006
2007 if (!sbi->s_jquota_fmt) {
2008 ext4_msg(sb, KERN_ERR, "journaled quota format "
2009 "not specified");
2010 return 0;
2011 }
2012 }
2013 #endif
2014 if (test_opt(sb, DIOREAD_NOLOCK)) {
2015 int blocksize =
2016 BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);
2017
2018 if (blocksize < PAGE_SIZE) {
2019 ext4_msg(sb, KERN_ERR, "can't mount with "
2020 "dioread_nolock if block size != PAGE_SIZE");
2021 return 0;
2022 }
2023 }
2024 return 1;
2025 }
2026
2027 static inline void ext4_show_quota_options(struct seq_file *seq,
2028 struct super_block *sb)
2029 {
2030 #if defined(CONFIG_QUOTA)
2031 struct ext4_sb_info *sbi = EXT4_SB(sb);
2032
2033 if (sbi->s_jquota_fmt) {
2034 char *fmtname = "";
2035
2036 switch (sbi->s_jquota_fmt) {
2037 case QFMT_VFS_OLD:
2038 fmtname = "vfsold";
2039 break;
2040 case QFMT_VFS_V0:
2041 fmtname = "vfsv0";
2042 break;
2043 case QFMT_VFS_V1:
2044 fmtname = "vfsv1";
2045 break;
2046 }
2047 seq_printf(seq, ",jqfmt=%s", fmtname);
2048 }
2049
2050 if (sbi->s_qf_names[USRQUOTA])
2051 seq_show_option(seq, "usrjquota", sbi->s_qf_names[USRQUOTA]);
2052
2053 if (sbi->s_qf_names[GRPQUOTA])
2054 seq_show_option(seq, "grpjquota", sbi->s_qf_names[GRPQUOTA]);
2055 #endif
2056 }
2057
2058 static const char *token2str(int token)
2059 {
2060 const struct match_token *t;
2061
2062 for (t = tokens; t->token != Opt_err; t++)
2063 if (t->token == token && !strchr(t->pattern, '='))
2064 break;
2065 return t->pattern;
2066 }
2067
2068 /*
2069 * Show an option if
2070 * - it's set to a non-default value OR
2071 * - if the per-sb default is different from the global default
2072 */
2073 static int _ext4_show_options(struct seq_file *seq, struct super_block *sb,
2074 int nodefs)
2075 {
2076 struct ext4_sb_info *sbi = EXT4_SB(sb);
2077 struct ext4_super_block *es = sbi->s_es;
2078 int def_errors, def_mount_opt = sbi->s_def_mount_opt;
2079 const struct mount_opts *m;
2080 char sep = nodefs ? '\n' : ',';
2081
2082 #define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep)
2083 #define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg)
2084
2085 if (sbi->s_sb_block != 1)
2086 SEQ_OPTS_PRINT("sb=%llu", sbi->s_sb_block);
2087
2088 for (m = ext4_mount_opts; m->token != Opt_err; m++) {
2089 int want_set = m->flags & MOPT_SET;
2090 if (((m->flags & (MOPT_SET|MOPT_CLEAR)) == 0) ||
2091 (m->flags & MOPT_CLEAR_ERR))
2092 continue;
2093 if (!nodefs && !(m->mount_opt & (sbi->s_mount_opt ^ def_mount_opt)))
2094 continue; /* skip if same as the default */
2095 if ((want_set &&
2096 (sbi->s_mount_opt & m->mount_opt) != m->mount_opt) ||
2097 (!want_set && (sbi->s_mount_opt & m->mount_opt)))
2098 continue; /* select Opt_noFoo vs Opt_Foo */
2099 SEQ_OPTS_PRINT("%s", token2str(m->token));
2100 }
2101
2102 if (nodefs || !uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT4_DEF_RESUID)) ||
2103 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID)
2104 SEQ_OPTS_PRINT("resuid=%u",
2105 from_kuid_munged(&init_user_ns, sbi->s_resuid));
2106 if (nodefs || !gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT4_DEF_RESGID)) ||
2107 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID)
2108 SEQ_OPTS_PRINT("resgid=%u",
2109 from_kgid_munged(&init_user_ns, sbi->s_resgid));
2110 def_errors = nodefs ? -1 : le16_to_cpu(es->s_errors);
2111 if (test_opt(sb, ERRORS_RO) && def_errors != EXT4_ERRORS_RO)
2112 SEQ_OPTS_PUTS("errors=remount-ro");
2113 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
2114 SEQ_OPTS_PUTS("errors=continue");
2115 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
2116 SEQ_OPTS_PUTS("errors=panic");
2117 if (nodefs || sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ)
2118 SEQ_OPTS_PRINT("commit=%lu", sbi->s_commit_interval / HZ);
2119 if (nodefs || sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME)
2120 SEQ_OPTS_PRINT("min_batch_time=%u", sbi->s_min_batch_time);
2121 if (nodefs || sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME)
2122 SEQ_OPTS_PRINT("max_batch_time=%u", sbi->s_max_batch_time);
2123 if (sb->s_flags & SB_I_VERSION)
2124 SEQ_OPTS_PUTS("i_version");
2125 if (nodefs || sbi->s_stripe)
2126 SEQ_OPTS_PRINT("stripe=%lu", sbi->s_stripe);
2127 if (nodefs || EXT4_MOUNT_DATA_FLAGS &
2128 (sbi->s_mount_opt ^ def_mount_opt)) {
2129 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
2130 SEQ_OPTS_PUTS("data=journal");
2131 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
2132 SEQ_OPTS_PUTS("data=ordered");
2133 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
2134 SEQ_OPTS_PUTS("data=writeback");
2135 }
2136 if (nodefs ||
2137 sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
2138 SEQ_OPTS_PRINT("inode_readahead_blks=%u",
2139 sbi->s_inode_readahead_blks);
2140
2141 if (test_opt(sb, INIT_INODE_TABLE) && (nodefs ||
2142 (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT)))
2143 SEQ_OPTS_PRINT("init_itable=%u", sbi->s_li_wait_mult);
2144 if (nodefs || sbi->s_max_dir_size_kb)
2145 SEQ_OPTS_PRINT("max_dir_size_kb=%u", sbi->s_max_dir_size_kb);
2146 if (test_opt(sb, DATA_ERR_ABORT))
2147 SEQ_OPTS_PUTS("data_err=abort");
2148
2149 ext4_show_quota_options(seq, sb);
2150 return 0;
2151 }
2152
2153 static int ext4_show_options(struct seq_file *seq, struct dentry *root)
2154 {
2155 return _ext4_show_options(seq, root->d_sb, 0);
2156 }
2157
2158 int ext4_seq_options_show(struct seq_file *seq, void *offset)
2159 {
2160 struct super_block *sb = seq->private;
2161 int rc;
2162
2163 seq_puts(seq, sb_rdonly(sb) ? "ro" : "rw");
2164 rc = _ext4_show_options(seq, sb, 1);
2165 seq_puts(seq, "\n");
2166 return rc;
2167 }
2168
2169 static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
2170 int read_only)
2171 {
2172 struct ext4_sb_info *sbi = EXT4_SB(sb);
2173 int err = 0;
2174
2175 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
2176 ext4_msg(sb, KERN_ERR, "revision level too high, "
2177 "forcing read-only mode");
2178 err = -EROFS;
2179 }
2180 if (read_only)
2181 goto done;
2182 if (!(sbi->s_mount_state & EXT4_VALID_FS))
2183 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
2184 "running e2fsck is recommended");
2185 else if (sbi->s_mount_state & EXT4_ERROR_FS)
2186 ext4_msg(sb, KERN_WARNING,
2187 "warning: mounting fs with errors, "
2188 "running e2fsck is recommended");
2189 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
2190 le16_to_cpu(es->s_mnt_count) >=
2191 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
2192 ext4_msg(sb, KERN_WARNING,
2193 "warning: maximal mount count reached, "
2194 "running e2fsck is recommended");
2195 else if (le32_to_cpu(es->s_checkinterval) &&
2196 (ext4_get_tstamp(es, s_lastcheck) +
2197 le32_to_cpu(es->s_checkinterval) <= ktime_get_real_seconds()))
2198 ext4_msg(sb, KERN_WARNING,
2199 "warning: checktime reached, "
2200 "running e2fsck is recommended");
2201 if (!sbi->s_journal)
2202 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
2203 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
2204 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
2205 le16_add_cpu(&es->s_mnt_count, 1);
2206 ext4_update_tstamp(es, s_mtime);
2207 ext4_update_dynamic_rev(sb);
2208 if (sbi->s_journal)
2209 ext4_set_feature_journal_needs_recovery(sb);
2210
2211 err = ext4_commit_super(sb, 1);
2212 done:
2213 if (test_opt(sb, DEBUG))
2214 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
2215 "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
2216 sb->s_blocksize,
2217 sbi->s_groups_count,
2218 EXT4_BLOCKS_PER_GROUP(sb),
2219 EXT4_INODES_PER_GROUP(sb),
2220 sbi->s_mount_opt, sbi->s_mount_opt2);
2221
2222 cleancache_init_fs(sb);
2223 return err;
2224 }
2225
2226 int ext4_alloc_flex_bg_array(struct super_block *sb, ext4_group_t ngroup)
2227 {
2228 struct ext4_sb_info *sbi = EXT4_SB(sb);
2229 struct flex_groups *new_groups;
2230 int size;
2231
2232 if (!sbi->s_log_groups_per_flex)
2233 return 0;
2234
2235 size = ext4_flex_group(sbi, ngroup - 1) + 1;
2236 if (size <= sbi->s_flex_groups_allocated)
2237 return 0;
2238
2239 size = roundup_pow_of_two(size * sizeof(struct flex_groups));
2240 new_groups = kvzalloc(size, GFP_KERNEL);
2241 if (!new_groups) {
2242 ext4_msg(sb, KERN_ERR, "not enough memory for %d flex groups",
2243 size / (int) sizeof(struct flex_groups));
2244 return -ENOMEM;
2245 }
2246
2247 if (sbi->s_flex_groups) {
2248 memcpy(new_groups, sbi->s_flex_groups,
2249 (sbi->s_flex_groups_allocated *
2250 sizeof(struct flex_groups)));
2251 kvfree(sbi->s_flex_groups);
2252 }
2253 sbi->s_flex_groups = new_groups;
2254 sbi->s_flex_groups_allocated = size / sizeof(struct flex_groups);
2255 return 0;
2256 }
2257
2258 static int ext4_fill_flex_info(struct super_block *sb)
2259 {
2260 struct ext4_sb_info *sbi = EXT4_SB(sb);
2261 struct ext4_group_desc *gdp = NULL;
2262 ext4_group_t flex_group;
2263 int i, err;
2264
2265 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
2266 if (sbi->s_log_groups_per_flex < 1 || sbi->s_log_groups_per_flex > 31) {
2267 sbi->s_log_groups_per_flex = 0;
2268 return 1;
2269 }
2270
2271 err = ext4_alloc_flex_bg_array(sb, sbi->s_groups_count);
2272 if (err)
2273 goto failed;
2274
2275 for (i = 0; i < sbi->s_groups_count; i++) {
2276 gdp = ext4_get_group_desc(sb, i, NULL);
2277
2278 flex_group = ext4_flex_group(sbi, i);
2279 atomic_add(ext4_free_inodes_count(sb, gdp),
2280 &sbi->s_flex_groups[flex_group].free_inodes);
2281 atomic64_add(ext4_free_group_clusters(sb, gdp),
2282 &sbi->s_flex_groups[flex_group].free_clusters);
2283 atomic_add(ext4_used_dirs_count(sb, gdp),
2284 &sbi->s_flex_groups[flex_group].used_dirs);
2285 }
2286
2287 return 1;
2288 failed:
2289 return 0;
2290 }
2291
2292 static __le16 ext4_group_desc_csum(struct super_block *sb, __u32 block_group,
2293 struct ext4_group_desc *gdp)
2294 {
2295 int offset = offsetof(struct ext4_group_desc, bg_checksum);
2296 __u16 crc = 0;
2297 __le32 le_group = cpu_to_le32(block_group);
2298 struct ext4_sb_info *sbi = EXT4_SB(sb);
2299
2300 if (ext4_has_metadata_csum(sbi->s_sb)) {
2301 /* Use new metadata_csum algorithm */
2302 __u32 csum32;
2303 __u16 dummy_csum = 0;
2304
2305 csum32 = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&le_group,
2306 sizeof(le_group));
2307 csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp, offset);
2308 csum32 = ext4_chksum(sbi, csum32, (__u8 *)&dummy_csum,
2309 sizeof(dummy_csum));
2310 offset += sizeof(dummy_csum);
2311 if (offset < sbi->s_desc_size)
2312 csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp + offset,
2313 sbi->s_desc_size - offset);
2314
2315 crc = csum32 & 0xFFFF;
2316 goto out;
2317 }
2318
2319 /* old crc16 code */
2320 if (!ext4_has_feature_gdt_csum(sb))
2321 return 0;
2322
2323 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
2324 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
2325 crc = crc16(crc, (__u8 *)gdp, offset);
2326 offset += sizeof(gdp->bg_checksum); /* skip checksum */
2327 /* for checksum of struct ext4_group_desc do the rest...*/
2328 if (ext4_has_feature_64bit(sb) &&
2329 offset < le16_to_cpu(sbi->s_es->s_desc_size))
2330 crc = crc16(crc, (__u8 *)gdp + offset,
2331 le16_to_cpu(sbi->s_es->s_desc_size) -
2332 offset);
2333
2334 out:
2335 return cpu_to_le16(crc);
2336 }
2337
2338 int ext4_group_desc_csum_verify(struct super_block *sb, __u32 block_group,
2339 struct ext4_group_desc *gdp)
2340 {
2341 if (ext4_has_group_desc_csum(sb) &&
2342 (gdp->bg_checksum != ext4_group_desc_csum(sb, block_group, gdp)))
2343 return 0;
2344
2345 return 1;
2346 }
2347
2348 void ext4_group_desc_csum_set(struct super_block *sb, __u32 block_group,
2349 struct ext4_group_desc *gdp)
2350 {
2351 if (!ext4_has_group_desc_csum(sb))
2352 return;
2353 gdp->bg_checksum = ext4_group_desc_csum(sb, block_group, gdp);
2354 }
2355
2356 /* Called at mount-time, super-block is locked */
2357 static int ext4_check_descriptors(struct super_block *sb,
2358 ext4_fsblk_t sb_block,
2359 ext4_group_t *first_not_zeroed)
2360 {
2361 struct ext4_sb_info *sbi = EXT4_SB(sb);
2362 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
2363 ext4_fsblk_t last_block;
2364 ext4_fsblk_t last_bg_block = sb_block + ext4_bg_num_gdb(sb, 0);
2365 ext4_fsblk_t block_bitmap;
2366 ext4_fsblk_t inode_bitmap;
2367 ext4_fsblk_t inode_table;
2368 int flexbg_flag = 0;
2369 ext4_group_t i, grp = sbi->s_groups_count;
2370
2371 if (ext4_has_feature_flex_bg(sb))
2372 flexbg_flag = 1;
2373
2374 ext4_debug("Checking group descriptors");
2375
2376 for (i = 0; i < sbi->s_groups_count; i++) {
2377 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
2378
2379 if (i == sbi->s_groups_count - 1 || flexbg_flag)
2380 last_block = ext4_blocks_count(sbi->s_es) - 1;
2381 else
2382 last_block = first_block +
2383 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
2384
2385 if ((grp == sbi->s_groups_count) &&
2386 !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2387 grp = i;
2388
2389 block_bitmap = ext4_block_bitmap(sb, gdp);
2390 if (block_bitmap == sb_block) {
2391 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2392 "Block bitmap for group %u overlaps "
2393 "superblock", i);
2394 if (!sb_rdonly(sb))
2395 return 0;
2396 }
2397 if (block_bitmap >= sb_block + 1 &&
2398 block_bitmap <= last_bg_block) {
2399 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2400 "Block bitmap for group %u overlaps "
2401 "block group descriptors", i);
2402 if (!sb_rdonly(sb))
2403 return 0;
2404 }
2405 if (block_bitmap < first_block || block_bitmap > last_block) {
2406 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2407 "Block bitmap for group %u not in group "
2408 "(block %llu)!", i, block_bitmap);
2409 return 0;
2410 }
2411 inode_bitmap = ext4_inode_bitmap(sb, gdp);
2412 if (inode_bitmap == sb_block) {
2413 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2414 "Inode bitmap for group %u overlaps "
2415 "superblock", i);
2416 if (!sb_rdonly(sb))
2417 return 0;
2418 }
2419 if (inode_bitmap >= sb_block + 1 &&
2420 inode_bitmap <= last_bg_block) {
2421 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2422 "Inode bitmap for group %u overlaps "
2423 "block group descriptors", i);
2424 if (!sb_rdonly(sb))
2425 return 0;
2426 }
2427 if (inode_bitmap < first_block || inode_bitmap > last_block) {
2428 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2429 "Inode bitmap for group %u not in group "
2430 "(block %llu)!", i, inode_bitmap);
2431 return 0;
2432 }
2433 inode_table = ext4_inode_table(sb, gdp);
2434 if (inode_table == sb_block) {
2435 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2436 "Inode table for group %u overlaps "
2437 "superblock", i);
2438 if (!sb_rdonly(sb))
2439 return 0;
2440 }
2441 if (inode_table >= sb_block + 1 &&
2442 inode_table <= last_bg_block) {
2443 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2444 "Inode table for group %u overlaps "
2445 "block group descriptors", i);
2446 if (!sb_rdonly(sb))
2447 return 0;
2448 }
2449 if (inode_table < first_block ||
2450 inode_table + sbi->s_itb_per_group - 1 > last_block) {
2451 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2452 "Inode table for group %u not in group "
2453 "(block %llu)!", i, inode_table);
2454 return 0;
2455 }
2456 ext4_lock_group(sb, i);
2457 if (!ext4_group_desc_csum_verify(sb, i, gdp)) {
2458 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2459 "Checksum for group %u failed (%u!=%u)",
2460 i, le16_to_cpu(ext4_group_desc_csum(sb, i,
2461 gdp)), le16_to_cpu(gdp->bg_checksum));
2462 if (!sb_rdonly(sb)) {
2463 ext4_unlock_group(sb, i);
2464 return 0;
2465 }
2466 }
2467 ext4_unlock_group(sb, i);
2468 if (!flexbg_flag)
2469 first_block += EXT4_BLOCKS_PER_GROUP(sb);
2470 }
2471 if (NULL != first_not_zeroed)
2472 *first_not_zeroed = grp;
2473 return 1;
2474 }
2475
2476 /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
2477 * the superblock) which were deleted from all directories, but held open by
2478 * a process at the time of a crash. We walk the list and try to delete these
2479 * inodes at recovery time (only with a read-write filesystem).
2480 *
2481 * In order to keep the orphan inode chain consistent during traversal (in
2482 * case of crash during recovery), we link each inode into the superblock
2483 * orphan list_head and handle it the same way as an inode deletion during
2484 * normal operation (which journals the operations for us).
2485 *
2486 * We only do an iget() and an iput() on each inode, which is very safe if we
2487 * accidentally point at an in-use or already deleted inode. The worst that
2488 * can happen in this case is that we get a "bit already cleared" message from
2489 * ext4_free_inode(). The only reason we would point at a wrong inode is if
2490 * e2fsck was run on this filesystem, and it must have already done the orphan
2491 * inode cleanup for us, so we can safely abort without any further action.
2492 */
2493 static void ext4_orphan_cleanup(struct super_block *sb,
2494 struct ext4_super_block *es)
2495 {
2496 unsigned int s_flags = sb->s_flags;
2497 int ret, nr_orphans = 0, nr_truncates = 0;
2498 #ifdef CONFIG_QUOTA
2499 int quota_update = 0;
2500 int i;
2501 #endif
2502 if (!es->s_last_orphan) {
2503 jbd_debug(4, "no orphan inodes to clean up\n");
2504 return;
2505 }
2506
2507 if (bdev_read_only(sb->s_bdev)) {
2508 ext4_msg(sb, KERN_ERR, "write access "
2509 "unavailable, skipping orphan cleanup");
2510 return;
2511 }
2512
2513 /* Check if feature set would not allow a r/w mount */
2514 if (!ext4_feature_set_ok(sb, 0)) {
2515 ext4_msg(sb, KERN_INFO, "Skipping orphan cleanup due to "
2516 "unknown ROCOMPAT features");
2517 return;
2518 }
2519
2520 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
2521 /* don't clear list on RO mount w/ errors */
2522 if (es->s_last_orphan && !(s_flags & SB_RDONLY)) {
2523 ext4_msg(sb, KERN_INFO, "Errors on filesystem, "
2524 "clearing orphan list.\n");
2525 es->s_last_orphan = 0;
2526 }
2527 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2528 return;
2529 }
2530
2531 if (s_flags & SB_RDONLY) {
2532 ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
2533 sb->s_flags &= ~SB_RDONLY;
2534 }
2535 #ifdef CONFIG_QUOTA
2536 /* Needed for iput() to work correctly and not trash data */
2537 sb->s_flags |= SB_ACTIVE;
2538
2539 /*
2540 * Turn on quotas which were not enabled for read-only mounts if
2541 * filesystem has quota feature, so that they are updated correctly.
2542 */
2543 if (ext4_has_feature_quota(sb) && (s_flags & SB_RDONLY)) {
2544 int ret = ext4_enable_quotas(sb);
2545
2546 if (!ret)
2547 quota_update = 1;
2548 else
2549 ext4_msg(sb, KERN_ERR,
2550 "Cannot turn on quotas: error %d", ret);
2551 }
2552
2553 /* Turn on journaled quotas used for old sytle */
2554 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
2555 if (EXT4_SB(sb)->s_qf_names[i]) {
2556 int ret = ext4_quota_on_mount(sb, i);
2557
2558 if (!ret)
2559 quota_update = 1;
2560 else
2561 ext4_msg(sb, KERN_ERR,
2562 "Cannot turn on journaled "
2563 "quota: type %d: error %d", i, ret);
2564 }
2565 }
2566 #endif
2567
2568 while (es->s_last_orphan) {
2569 struct inode *inode;
2570
2571 /*
2572 * We may have encountered an error during cleanup; if
2573 * so, skip the rest.
2574 */
2575 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
2576 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2577 es->s_last_orphan = 0;
2578 break;
2579 }
2580
2581 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
2582 if (IS_ERR(inode)) {
2583 es->s_last_orphan = 0;
2584 break;
2585 }
2586
2587 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
2588 dquot_initialize(inode);
2589 if (inode->i_nlink) {
2590 if (test_opt(sb, DEBUG))
2591 ext4_msg(sb, KERN_DEBUG,
2592 "%s: truncating inode %lu to %lld bytes",
2593 __func__, inode->i_ino, inode->i_size);
2594 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
2595 inode->i_ino, inode->i_size);
2596 inode_lock(inode);
2597 truncate_inode_pages(inode->i_mapping, inode->i_size);
2598 ret = ext4_truncate(inode);
2599 if (ret)
2600 ext4_std_error(inode->i_sb, ret);
2601 inode_unlock(inode);
2602 nr_truncates++;
2603 } else {
2604 if (test_opt(sb, DEBUG))
2605 ext4_msg(sb, KERN_DEBUG,
2606 "%s: deleting unreferenced inode %lu",
2607 __func__, inode->i_ino);
2608 jbd_debug(2, "deleting unreferenced inode %lu\n",
2609 inode->i_ino);
2610 nr_orphans++;
2611 }
2612 iput(inode); /* The delete magic happens here! */
2613 }
2614
2615 #define PLURAL(x) (x), ((x) == 1) ? "" : "s"
2616
2617 if (nr_orphans)
2618 ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
2619 PLURAL(nr_orphans));
2620 if (nr_truncates)
2621 ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
2622 PLURAL(nr_truncates));
2623 #ifdef CONFIG_QUOTA
2624 /* Turn off quotas if they were enabled for orphan cleanup */
2625 if (quota_update) {
2626 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
2627 if (sb_dqopt(sb)->files[i])
2628 dquot_quota_off(sb, i);
2629 }
2630 }
2631 #endif
2632 sb->s_flags = s_flags; /* Restore SB_RDONLY status */
2633 }
2634
2635 /*
2636 * Maximal extent format file size.
2637 * Resulting logical blkno at s_maxbytes must fit in our on-disk
2638 * extent format containers, within a sector_t, and within i_blocks
2639 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
2640 * so that won't be a limiting factor.
2641 *
2642 * However there is other limiting factor. We do store extents in the form
2643 * of starting block and length, hence the resulting length of the extent
2644 * covering maximum file size must fit into on-disk format containers as
2645 * well. Given that length is always by 1 unit bigger than max unit (because
2646 * we count 0 as well) we have to lower the s_maxbytes by one fs block.
2647 *
2648 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
2649 */
2650 static loff_t ext4_max_size(int blkbits, int has_huge_files)
2651 {
2652 loff_t res;
2653 loff_t upper_limit = MAX_LFS_FILESIZE;
2654
2655 /* small i_blocks in vfs inode? */
2656 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
2657 /*
2658 * CONFIG_LBDAF is not enabled implies the inode
2659 * i_block represent total blocks in 512 bytes
2660 * 32 == size of vfs inode i_blocks * 8
2661 */
2662 upper_limit = (1LL << 32) - 1;
2663
2664 /* total blocks in file system block size */
2665 upper_limit >>= (blkbits - 9);
2666 upper_limit <<= blkbits;
2667 }
2668
2669 /*
2670 * 32-bit extent-start container, ee_block. We lower the maxbytes
2671 * by one fs block, so ee_len can cover the extent of maximum file
2672 * size
2673 */
2674 res = (1LL << 32) - 1;
2675 res <<= blkbits;
2676
2677 /* Sanity check against vm- & vfs- imposed limits */
2678 if (res > upper_limit)
2679 res = upper_limit;
2680
2681 return res;
2682 }
2683
2684 /*
2685 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
2686 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2687 * We need to be 1 filesystem block less than the 2^48 sector limit.
2688 */
2689 static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
2690 {
2691 loff_t res = EXT4_NDIR_BLOCKS;
2692 int meta_blocks;
2693 loff_t upper_limit;
2694 /* This is calculated to be the largest file size for a dense, block
2695 * mapped file such that the file's total number of 512-byte sectors,
2696 * including data and all indirect blocks, does not exceed (2^48 - 1).
2697 *
2698 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2699 * number of 512-byte sectors of the file.
2700 */
2701
2702 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
2703 /*
2704 * !has_huge_files or CONFIG_LBDAF not enabled implies that
2705 * the inode i_block field represents total file blocks in
2706 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
2707 */
2708 upper_limit = (1LL << 32) - 1;
2709
2710 /* total blocks in file system block size */
2711 upper_limit >>= (bits - 9);
2712
2713 } else {
2714 /*
2715 * We use 48 bit ext4_inode i_blocks
2716 * With EXT4_HUGE_FILE_FL set the i_blocks
2717 * represent total number of blocks in
2718 * file system block size
2719 */
2720 upper_limit = (1LL << 48) - 1;
2721
2722 }
2723
2724 /* indirect blocks */
2725 meta_blocks = 1;
2726 /* double indirect blocks */
2727 meta_blocks += 1 + (1LL << (bits-2));
2728 /* tripple indirect blocks */
2729 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
2730
2731 upper_limit -= meta_blocks;
2732 upper_limit <<= bits;
2733
2734 res += 1LL << (bits-2);
2735 res += 1LL << (2*(bits-2));
2736 res += 1LL << (3*(bits-2));
2737 res <<= bits;
2738 if (res > upper_limit)
2739 res = upper_limit;
2740
2741 if (res > MAX_LFS_FILESIZE)
2742 res = MAX_LFS_FILESIZE;
2743
2744 return res;
2745 }
2746
2747 static ext4_fsblk_t descriptor_loc(struct super_block *sb,
2748 ext4_fsblk_t logical_sb_block, int nr)
2749 {
2750 struct ext4_sb_info *sbi = EXT4_SB(sb);
2751 ext4_group_t bg, first_meta_bg;
2752 int has_super = 0;
2753
2754 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
2755
2756 if (!ext4_has_feature_meta_bg(sb) || nr < first_meta_bg)
2757 return logical_sb_block + nr + 1;
2758 bg = sbi->s_desc_per_block * nr;
2759 if (ext4_bg_has_super(sb, bg))
2760 has_super = 1;
2761
2762 /*
2763 * If we have a meta_bg fs with 1k blocks, group 0's GDT is at
2764 * block 2, not 1. If s_first_data_block == 0 (bigalloc is enabled
2765 * on modern mke2fs or blksize > 1k on older mke2fs) then we must
2766 * compensate.
2767 */
2768 if (sb->s_blocksize == 1024 && nr == 0 &&
2769 le32_to_cpu(sbi->s_es->s_first_data_block) == 0)
2770 has_super++;
2771
2772 return (has_super + ext4_group_first_block_no(sb, bg));
2773 }
2774
2775 /**
2776 * ext4_get_stripe_size: Get the stripe size.
2777 * @sbi: In memory super block info
2778 *
2779 * If we have specified it via mount option, then
2780 * use the mount option value. If the value specified at mount time is
2781 * greater than the blocks per group use the super block value.
2782 * If the super block value is greater than blocks per group return 0.
2783 * Allocator needs it be less than blocks per group.
2784 *
2785 */
2786 static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
2787 {
2788 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
2789 unsigned long stripe_width =
2790 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
2791 int ret;
2792
2793 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
2794 ret = sbi->s_stripe;
2795 else if (stripe_width && stripe_width <= sbi->s_blocks_per_group)
2796 ret = stripe_width;
2797 else if (stride && stride <= sbi->s_blocks_per_group)
2798 ret = stride;
2799 else
2800 ret = 0;
2801
2802 /*
2803 * If the stripe width is 1, this makes no sense and
2804 * we set it to 0 to turn off stripe handling code.
2805 */
2806 if (ret <= 1)
2807 ret = 0;
2808
2809 return ret;
2810 }
2811
2812 /*
2813 * Check whether this filesystem can be mounted based on
2814 * the features present and the RDONLY/RDWR mount requested.
2815 * Returns 1 if this filesystem can be mounted as requested,
2816 * 0 if it cannot be.
2817 */
2818 static int ext4_feature_set_ok(struct super_block *sb, int readonly)
2819 {
2820 if (ext4_has_unknown_ext4_incompat_features(sb)) {
2821 ext4_msg(sb, KERN_ERR,
2822 "Couldn't mount because of "
2823 "unsupported optional features (%x)",
2824 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
2825 ~EXT4_FEATURE_INCOMPAT_SUPP));
2826 return 0;
2827 }
2828
2829 if (readonly)
2830 return 1;
2831
2832 if (ext4_has_feature_readonly(sb)) {
2833 ext4_msg(sb, KERN_INFO, "filesystem is read-only");
2834 sb->s_flags |= SB_RDONLY;
2835 return 1;
2836 }
2837
2838 /* Check that feature set is OK for a read-write mount */
2839 if (ext4_has_unknown_ext4_ro_compat_features(sb)) {
2840 ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of "
2841 "unsupported optional features (%x)",
2842 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
2843 ~EXT4_FEATURE_RO_COMPAT_SUPP));
2844 return 0;
2845 }
2846 /*
2847 * Large file size enabled file system can only be mounted
2848 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
2849 */
2850 if (ext4_has_feature_huge_file(sb)) {
2851 if (sizeof(blkcnt_t) < sizeof(u64)) {
2852 ext4_msg(sb, KERN_ERR, "Filesystem with huge files "
2853 "cannot be mounted RDWR without "
2854 "CONFIG_LBDAF");
2855 return 0;
2856 }
2857 }
2858 if (ext4_has_feature_bigalloc(sb) && !ext4_has_feature_extents(sb)) {
2859 ext4_msg(sb, KERN_ERR,
2860 "Can't support bigalloc feature without "
2861 "extents feature\n");
2862 return 0;
2863 }
2864
2865 #ifndef CONFIG_QUOTA
2866 if (ext4_has_feature_quota(sb) && !readonly) {
2867 ext4_msg(sb, KERN_ERR,
2868 "Filesystem with quota feature cannot be mounted RDWR "
2869 "without CONFIG_QUOTA");
2870 return 0;
2871 }
2872 if (ext4_has_feature_project(sb) && !readonly) {
2873 ext4_msg(sb, KERN_ERR,
2874 "Filesystem with project quota feature cannot be mounted RDWR "
2875 "without CONFIG_QUOTA");
2876 return 0;
2877 }
2878 #endif /* CONFIG_QUOTA */
2879 return 1;
2880 }
2881
2882 /*
2883 * This function is called once a day if we have errors logged
2884 * on the file system
2885 */
2886 static void print_daily_error_info(struct timer_list *t)
2887 {
2888 struct ext4_sb_info *sbi = from_timer(sbi, t, s_err_report);
2889 struct super_block *sb = sbi->s_sb;
2890 struct ext4_super_block *es = sbi->s_es;
2891
2892 if (es->s_error_count)
2893 /* fsck newer than v1.41.13 is needed to clean this condition. */
2894 ext4_msg(sb, KERN_NOTICE, "error count since last fsck: %u",
2895 le32_to_cpu(es->s_error_count));
2896 if (es->s_first_error_time) {
2897 printk(KERN_NOTICE "EXT4-fs (%s): initial error at time %llu: %.*s:%d",
2898 sb->s_id,
2899 ext4_get_tstamp(es, s_first_error_time),
2900 (int) sizeof(es->s_first_error_func),
2901 es->s_first_error_func,
2902 le32_to_cpu(es->s_first_error_line));
2903 if (es->s_first_error_ino)
2904 printk(KERN_CONT ": inode %u",
2905 le32_to_cpu(es->s_first_error_ino));
2906 if (es->s_first_error_block)
2907 printk(KERN_CONT ": block %llu", (unsigned long long)
2908 le64_to_cpu(es->s_first_error_block));
2909 printk(KERN_CONT "\n");
2910 }
2911 if (es->s_last_error_time) {
2912 printk(KERN_NOTICE "EXT4-fs (%s): last error at time %llu: %.*s:%d",
2913 sb->s_id,
2914 ext4_get_tstamp(es, s_last_error_time),
2915 (int) sizeof(es->s_last_error_func),
2916 es->s_last_error_func,
2917 le32_to_cpu(es->s_last_error_line));
2918 if (es->s_last_error_ino)
2919 printk(KERN_CONT ": inode %u",
2920 le32_to_cpu(es->s_last_error_ino));
2921 if (es->s_last_error_block)
2922 printk(KERN_CONT ": block %llu", (unsigned long long)
2923 le64_to_cpu(es->s_last_error_block));
2924 printk(KERN_CONT "\n");
2925 }
2926 mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ); /* Once a day */
2927 }
2928
2929 /* Find next suitable group and run ext4_init_inode_table */
2930 static int ext4_run_li_request(struct ext4_li_request *elr)
2931 {
2932 struct ext4_group_desc *gdp = NULL;
2933 ext4_group_t group, ngroups;
2934 struct super_block *sb;
2935 unsigned long timeout = 0;
2936 int ret = 0;
2937
2938 sb = elr->lr_super;
2939 ngroups = EXT4_SB(sb)->s_groups_count;
2940
2941 for (group = elr->lr_next_group; group < ngroups; group++) {
2942 gdp = ext4_get_group_desc(sb, group, NULL);
2943 if (!gdp) {
2944 ret = 1;
2945 break;
2946 }
2947
2948 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2949 break;
2950 }
2951
2952 if (group >= ngroups)
2953 ret = 1;
2954
2955 if (!ret) {
2956 timeout = jiffies;
2957 ret = ext4_init_inode_table(sb, group,
2958 elr->lr_timeout ? 0 : 1);
2959 if (elr->lr_timeout == 0) {
2960 timeout = (jiffies - timeout) *
2961 elr->lr_sbi->s_li_wait_mult;
2962 elr->lr_timeout = timeout;
2963 }
2964 elr->lr_next_sched = jiffies + elr->lr_timeout;
2965 elr->lr_next_group = group + 1;
2966 }
2967 return ret;
2968 }
2969
2970 /*
2971 * Remove lr_request from the list_request and free the
2972 * request structure. Should be called with li_list_mtx held
2973 */
2974 static void ext4_remove_li_request(struct ext4_li_request *elr)
2975 {
2976 struct ext4_sb_info *sbi;
2977
2978 if (!elr)
2979 return;
2980
2981 sbi = elr->lr_sbi;
2982
2983 list_del(&elr->lr_request);
2984 sbi->s_li_request = NULL;
2985 kfree(elr);
2986 }
2987
2988 static void ext4_unregister_li_request(struct super_block *sb)
2989 {
2990 mutex_lock(&ext4_li_mtx);
2991 if (!ext4_li_info) {
2992 mutex_unlock(&ext4_li_mtx);
2993 return;
2994 }
2995
2996 mutex_lock(&ext4_li_info->li_list_mtx);
2997 ext4_remove_li_request(EXT4_SB(sb)->s_li_request);
2998 mutex_unlock(&ext4_li_info->li_list_mtx);
2999 mutex_unlock(&ext4_li_mtx);
3000 }
3001
3002 static struct task_struct *ext4_lazyinit_task;
3003
3004 /*
3005 * This is the function where ext4lazyinit thread lives. It walks
3006 * through the request list searching for next scheduled filesystem.
3007 * When such a fs is found, run the lazy initialization request
3008 * (ext4_rn_li_request) and keep track of the time spend in this
3009 * function. Based on that time we compute next schedule time of
3010 * the request. When walking through the list is complete, compute
3011 * next waking time and put itself into sleep.
3012 */
3013 static int ext4_lazyinit_thread(void *arg)
3014 {
3015 struct ext4_lazy_init *eli = (struct ext4_lazy_init *)arg;
3016 struct list_head *pos, *n;
3017 struct ext4_li_request *elr;
3018 unsigned long next_wakeup, cur;
3019
3020 BUG_ON(NULL == eli);
3021
3022 cont_thread:
3023 while (true) {
3024 next_wakeup = MAX_JIFFY_OFFSET;
3025
3026 mutex_lock(&eli->li_list_mtx);
3027 if (list_empty(&eli->li_request_list)) {
3028 mutex_unlock(&eli->li_list_mtx);
3029 goto exit_thread;
3030 }
3031 list_for_each_safe(pos, n, &eli->li_request_list) {
3032 int err = 0;
3033 int progress = 0;
3034 elr = list_entry(pos, struct ext4_li_request,
3035 lr_request);
3036
3037 if (time_before(jiffies, elr->lr_next_sched)) {
3038 if (time_before(elr->lr_next_sched, next_wakeup))
3039 next_wakeup = elr->lr_next_sched;
3040 continue;
3041 }
3042 if (down_read_trylock(&elr->lr_super->s_umount)) {
3043 if (sb_start_write_trylock(elr->lr_super)) {
3044 progress = 1;
3045 /*
3046 * We hold sb->s_umount, sb can not
3047 * be removed from the list, it is
3048 * now safe to drop li_list_mtx
3049 */
3050 mutex_unlock(&eli->li_list_mtx);
3051 err = ext4_run_li_request(elr);
3052 sb_end_write(elr->lr_super);
3053 mutex_lock(&eli->li_list_mtx);
3054 n = pos->next;
3055 }
3056 up_read((&elr->lr_super->s_umount));
3057 }
3058 /* error, remove the lazy_init job */
3059 if (err) {
3060 ext4_remove_li_request(elr);
3061 continue;
3062 }
3063 if (!progress) {
3064 elr->lr_next_sched = jiffies +
3065 (prandom_u32()
3066 % (EXT4_DEF_LI_MAX_START_DELAY * HZ));
3067 }
3068 if (time_before(elr->lr_next_sched, next_wakeup))
3069 next_wakeup = elr->lr_next_sched;
3070 }
3071 mutex_unlock(&eli->li_list_mtx);
3072
3073 try_to_freeze();
3074
3075 cur = jiffies;
3076 if ((time_after_eq(cur, next_wakeup)) ||
3077 (MAX_JIFFY_OFFSET == next_wakeup)) {
3078 cond_resched();
3079 continue;
3080 }
3081
3082 schedule_timeout_interruptible(next_wakeup - cur);
3083
3084 if (kthread_should_stop()) {
3085 ext4_clear_request_list();
3086 goto exit_thread;
3087 }
3088 }
3089
3090 exit_thread:
3091 /*
3092 * It looks like the request list is empty, but we need
3093 * to check it under the li_list_mtx lock, to prevent any
3094 * additions into it, and of course we should lock ext4_li_mtx
3095 * to atomically free the list and ext4_li_info, because at
3096 * this point another ext4 filesystem could be registering
3097 * new one.
3098 */
3099 mutex_lock(&ext4_li_mtx);
3100 mutex_lock(&eli->li_list_mtx);
3101 if (!list_empty(&eli->li_request_list)) {
3102 mutex_unlock(&eli->li_list_mtx);
3103 mutex_unlock(&ext4_li_mtx);
3104 goto cont_thread;
3105 }
3106 mutex_unlock(&eli->li_list_mtx);
3107 kfree(ext4_li_info);
3108 ext4_li_info = NULL;
3109 mutex_unlock(&ext4_li_mtx);
3110
3111 return 0;
3112 }
3113
3114 static void ext4_clear_request_list(void)
3115 {
3116 struct list_head *pos, *n;
3117 struct ext4_li_request *elr;
3118
3119 mutex_lock(&ext4_li_info->li_list_mtx);
3120 list_for_each_safe(pos, n, &ext4_li_info->li_request_list) {
3121 elr = list_entry(pos, struct ext4_li_request,
3122 lr_request);
3123 ext4_remove_li_request(elr);
3124 }
3125 mutex_unlock(&ext4_li_info->li_list_mtx);
3126 }
3127
3128 static int ext4_run_lazyinit_thread(void)
3129 {
3130 ext4_lazyinit_task = kthread_run(ext4_lazyinit_thread,
3131 ext4_li_info, "ext4lazyinit");
3132 if (IS_ERR(ext4_lazyinit_task)) {
3133 int err = PTR_ERR(ext4_lazyinit_task);
3134 ext4_clear_request_list();
3135 kfree(ext4_li_info);
3136 ext4_li_info = NULL;
3137 printk(KERN_CRIT "EXT4-fs: error %d creating inode table "
3138 "initialization thread\n",
3139 err);
3140 return err;
3141 }
3142 ext4_li_info->li_state |= EXT4_LAZYINIT_RUNNING;
3143 return 0;
3144 }
3145
3146 /*
3147 * Check whether it make sense to run itable init. thread or not.
3148 * If there is at least one uninitialized inode table, return
3149 * corresponding group number, else the loop goes through all
3150 * groups and return total number of groups.
3151 */
3152 static ext4_group_t ext4_has_uninit_itable(struct super_block *sb)
3153 {
3154 ext4_group_t group, ngroups = EXT4_SB(sb)->s_groups_count;
3155 struct ext4_group_desc *gdp = NULL;
3156
3157 if (!ext4_has_group_desc_csum(sb))
3158 return ngroups;
3159
3160 for (group = 0; group < ngroups; group++) {
3161 gdp = ext4_get_group_desc(sb, group, NULL);
3162 if (!gdp)
3163 continue;
3164
3165 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
3166 break;
3167 }
3168
3169 return group;
3170 }
3171
3172 static int ext4_li_info_new(void)
3173 {
3174 struct ext4_lazy_init *eli = NULL;
3175
3176 eli = kzalloc(sizeof(*eli), GFP_KERNEL);
3177 if (!eli)
3178 return -ENOMEM;
3179
3180 INIT_LIST_HEAD(&eli->li_request_list);
3181 mutex_init(&eli->li_list_mtx);
3182
3183 eli->li_state |= EXT4_LAZYINIT_QUIT;
3184
3185 ext4_li_info = eli;
3186
3187 return 0;
3188 }
3189
3190 static struct ext4_li_request *ext4_li_request_new(struct super_block *sb,
3191 ext4_group_t start)
3192 {
3193 struct ext4_sb_info *sbi = EXT4_SB(sb);
3194 struct ext4_li_request *elr;
3195
3196 elr = kzalloc(sizeof(*elr), GFP_KERNEL);
3197 if (!elr)
3198 return NULL;
3199
3200 elr->lr_super = sb;
3201 elr->lr_sbi = sbi;
3202 elr->lr_next_group = start;
3203
3204 /*
3205 * Randomize first schedule time of the request to
3206 * spread the inode table initialization requests
3207 * better.
3208 */
3209 elr->lr_next_sched = jiffies + (prandom_u32() %
3210 (EXT4_DEF_LI_MAX_START_DELAY * HZ));
3211 return elr;
3212 }
3213
3214 int ext4_register_li_request(struct super_block *sb,
3215 ext4_group_t first_not_zeroed)
3216 {
3217 struct ext4_sb_info *sbi = EXT4_SB(sb);
3218 struct ext4_li_request *elr = NULL;
3219 ext4_group_t ngroups = sbi->s_groups_count;
3220 int ret = 0;
3221
3222 mutex_lock(&ext4_li_mtx);
3223 if (sbi->s_li_request != NULL) {
3224 /*
3225 * Reset timeout so it can be computed again, because
3226 * s_li_wait_mult might have changed.
3227 */
3228 sbi->s_li_request->lr_timeout = 0;
3229 goto out;
3230 }
3231
3232 if (first_not_zeroed == ngroups || sb_rdonly(sb) ||
3233 !test_opt(sb, INIT_INODE_TABLE))
3234 goto out;
3235
3236 elr = ext4_li_request_new(sb, first_not_zeroed);
3237 if (!elr) {
3238 ret = -ENOMEM;
3239 goto out;
3240 }
3241
3242 if (NULL == ext4_li_info) {
3243 ret = ext4_li_info_new();
3244 if (ret)
3245 goto out;
3246 }
3247
3248 mutex_lock(&ext4_li_info->li_list_mtx);
3249 list_add(&elr->lr_request, &ext4_li_info->li_request_list);
3250 mutex_unlock(&ext4_li_info->li_list_mtx);
3251
3252 sbi->s_li_request = elr;
3253 /*
3254 * set elr to NULL here since it has been inserted to
3255 * the request_list and the removal and free of it is
3256 * handled by ext4_clear_request_list from now on.
3257 */
3258 elr = NULL;
3259
3260 if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) {
3261 ret = ext4_run_lazyinit_thread();
3262 if (ret)
3263 goto out;
3264 }
3265 out:
3266 mutex_unlock(&ext4_li_mtx);
3267 if (ret)
3268 kfree(elr);
3269 return ret;
3270 }
3271
3272 /*
3273 * We do not need to lock anything since this is called on
3274 * module unload.
3275 */
3276 static void ext4_destroy_lazyinit_thread(void)
3277 {
3278 /*
3279 * If thread exited earlier
3280 * there's nothing to be done.
3281 */
3282 if (!ext4_li_info || !ext4_lazyinit_task)
3283 return;
3284
3285 kthread_stop(ext4_lazyinit_task);
3286 }
3287
3288 static int set_journal_csum_feature_set(struct super_block *sb)
3289 {
3290 int ret = 1;
3291 int compat, incompat;
3292 struct ext4_sb_info *sbi = EXT4_SB(sb);
3293
3294 if (ext4_has_metadata_csum(sb)) {
3295 /* journal checksum v3 */
3296 compat = 0;
3297 incompat = JBD2_FEATURE_INCOMPAT_CSUM_V3;
3298 } else {
3299 /* journal checksum v1 */
3300 compat = JBD2_FEATURE_COMPAT_CHECKSUM;
3301 incompat = 0;
3302 }
3303
3304 jbd2_journal_clear_features(sbi->s_journal,
3305 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
3306 JBD2_FEATURE_INCOMPAT_CSUM_V3 |
3307 JBD2_FEATURE_INCOMPAT_CSUM_V2);
3308 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
3309 ret = jbd2_journal_set_features(sbi->s_journal,
3310 compat, 0,
3311 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT |
3312 incompat);
3313 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
3314 ret = jbd2_journal_set_features(sbi->s_journal,
3315 compat, 0,
3316 incompat);
3317 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
3318 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
3319 } else {
3320 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
3321 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
3322 }
3323
3324 return ret;
3325 }
3326
3327 /*
3328 * Note: calculating the overhead so we can be compatible with
3329 * historical BSD practice is quite difficult in the face of
3330 * clusters/bigalloc. This is because multiple metadata blocks from
3331 * different block group can end up in the same allocation cluster.
3332 * Calculating the exact overhead in the face of clustered allocation
3333 * requires either O(all block bitmaps) in memory or O(number of block
3334 * groups**2) in time. We will still calculate the superblock for
3335 * older file systems --- and if we come across with a bigalloc file
3336 * system with zero in s_overhead_clusters the estimate will be close to
3337 * correct especially for very large cluster sizes --- but for newer
3338 * file systems, it's better to calculate this figure once at mkfs
3339 * time, and store it in the superblock. If the superblock value is
3340 * present (even for non-bigalloc file systems), we will use it.
3341 */
3342 static int count_overhead(struct super_block *sb, ext4_group_t grp,
3343 char *buf)
3344 {
3345 struct ext4_sb_info *sbi = EXT4_SB(sb);
3346 struct ext4_group_desc *gdp;
3347 ext4_fsblk_t first_block, last_block, b;
3348 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3349 int s, j, count = 0;
3350
3351 if (!ext4_has_feature_bigalloc(sb))
3352 return (ext4_bg_has_super(sb, grp) + ext4_bg_num_gdb(sb, grp) +
3353 sbi->s_itb_per_group + 2);
3354
3355 first_block = le32_to_cpu(sbi->s_es->s_first_data_block) +
3356 (grp * EXT4_BLOCKS_PER_GROUP(sb));
3357 last_block = first_block + EXT4_BLOCKS_PER_GROUP(sb) - 1;
3358 for (i = 0; i < ngroups; i++) {
3359 gdp = ext4_get_group_desc(sb, i, NULL);
3360 b = ext4_block_bitmap(sb, gdp);
3361 if (b >= first_block && b <= last_block) {
3362 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3363 count++;
3364 }
3365 b = ext4_inode_bitmap(sb, gdp);
3366 if (b >= first_block && b <= last_block) {
3367 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3368 count++;
3369 }
3370 b = ext4_inode_table(sb, gdp);
3371 if (b >= first_block && b + sbi->s_itb_per_group <= last_block)
3372 for (j = 0; j < sbi->s_itb_per_group; j++, b++) {
3373 int c = EXT4_B2C(sbi, b - first_block);
3374 ext4_set_bit(c, buf);
3375 count++;
3376 }
3377 if (i != grp)
3378 continue;
3379 s = 0;
3380 if (ext4_bg_has_super(sb, grp)) {
3381 ext4_set_bit(s++, buf);
3382 count++;
3383 }
3384 j = ext4_bg_num_gdb(sb, grp);
3385 if (s + j > EXT4_BLOCKS_PER_GROUP(sb)) {
3386 ext4_error(sb, "Invalid number of block group "
3387 "descriptor blocks: %d", j);
3388 j = EXT4_BLOCKS_PER_GROUP(sb) - s;
3389 }
3390 count += j;
3391 for (; j > 0; j--)
3392 ext4_set_bit(EXT4_B2C(sbi, s++), buf);
3393 }
3394 if (!count)
3395 return 0;
3396 return EXT4_CLUSTERS_PER_GROUP(sb) -
3397 ext4_count_free(buf, EXT4_CLUSTERS_PER_GROUP(sb) / 8);
3398 }
3399
3400 /*
3401 * Compute the overhead and stash it in sbi->s_overhead
3402 */
3403 int ext4_calculate_overhead(struct super_block *sb)
3404 {
3405 struct ext4_sb_info *sbi = EXT4_SB(sb);
3406 struct ext4_super_block *es = sbi->s_es;
3407 struct inode *j_inode;
3408 unsigned int j_blocks, j_inum = le32_to_cpu(es->s_journal_inum);
3409 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3410 ext4_fsblk_t overhead = 0;
3411 char *buf = (char *) get_zeroed_page(GFP_NOFS);
3412
3413 if (!buf)
3414 return -ENOMEM;
3415
3416 /*
3417 * Compute the overhead (FS structures). This is constant
3418 * for a given filesystem unless the number of block groups
3419 * changes so we cache the previous value until it does.
3420 */
3421
3422 /*
3423 * All of the blocks before first_data_block are overhead
3424 */
3425 overhead = EXT4_B2C(sbi, le32_to_cpu(es->s_first_data_block));
3426
3427 /*
3428 * Add the overhead found in each block group
3429 */
3430 for (i = 0; i < ngroups; i++) {
3431 int blks;
3432
3433 blks = count_overhead(sb, i, buf);
3434 overhead += blks;
3435 if (blks)
3436 memset(buf, 0, PAGE_SIZE);
3437 cond_resched();
3438 }
3439
3440 /*
3441 * Add the internal journal blocks whether the journal has been
3442 * loaded or not
3443 */
3444 if (sbi->s_journal && !sbi->journal_bdev)
3445 overhead += EXT4_NUM_B2C(sbi, sbi->s_journal->j_maxlen);
3446 else if (ext4_has_feature_journal(sb) && !sbi->s_journal) {
3447 j_inode = ext4_get_journal_inode(sb, j_inum);
3448 if (j_inode) {
3449 j_blocks = j_inode->i_size >> sb->s_blocksize_bits;
3450 overhead += EXT4_NUM_B2C(sbi, j_blocks);
3451 iput(j_inode);
3452 } else {
3453 ext4_msg(sb, KERN_ERR, "can't get journal size");
3454 }
3455 }
3456 sbi->s_overhead = overhead;
3457 smp_wmb();
3458 free_page((unsigned long) buf);
3459 return 0;
3460 }
3461
3462 static void ext4_set_resv_clusters(struct super_block *sb)
3463 {
3464 ext4_fsblk_t resv_clusters;
3465 struct ext4_sb_info *sbi = EXT4_SB(sb);
3466
3467 /*
3468 * There's no need to reserve anything when we aren't using extents.
3469 * The space estimates are exact, there are no unwritten extents,
3470 * hole punching doesn't need new metadata... This is needed especially
3471 * to keep ext2/3 backward compatibility.
3472 */
3473 if (!ext4_has_feature_extents(sb))
3474 return;
3475 /*
3476 * By default we reserve 2% or 4096 clusters, whichever is smaller.
3477 * This should cover the situations where we can not afford to run
3478 * out of space like for example punch hole, or converting
3479 * unwritten extents in delalloc path. In most cases such
3480 * allocation would require 1, or 2 blocks, higher numbers are
3481 * very rare.
3482 */
3483 resv_clusters = (ext4_blocks_count(sbi->s_es) >>
3484 sbi->s_cluster_bits);
3485
3486 do_div(resv_clusters, 50);
3487 resv_clusters = min_t(ext4_fsblk_t, resv_clusters, 4096);
3488
3489 atomic64_set(&sbi->s_resv_clusters, resv_clusters);
3490 }
3491
3492 static int ext4_fill_super(struct super_block *sb, void *data, int silent)
3493 {
3494 struct dax_device *dax_dev = fs_dax_get_by_bdev(sb->s_bdev);
3495 char *orig_data = kstrdup(data, GFP_KERNEL);
3496 struct buffer_head *bh;
3497 struct ext4_super_block *es = NULL;
3498 struct ext4_sb_info *sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
3499 ext4_fsblk_t block;
3500 ext4_fsblk_t sb_block = get_sb_block(&data);
3501 ext4_fsblk_t logical_sb_block;
3502 unsigned long offset = 0;
3503 unsigned long journal_devnum = 0;
3504 unsigned long def_mount_opts;
3505 struct inode *root;
3506 const char *descr;
3507 int ret = -ENOMEM;
3508 int blocksize, clustersize;
3509 unsigned int db_count;
3510 unsigned int i;
3511 int needs_recovery, has_huge_files, has_bigalloc;
3512 __u64 blocks_count;
3513 int err = 0;
3514 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
3515 ext4_group_t first_not_zeroed;
3516
3517 if ((data && !orig_data) || !sbi)
3518 goto out_free_base;
3519
3520 sbi->s_daxdev = dax_dev;
3521 sbi->s_blockgroup_lock =
3522 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
3523 if (!sbi->s_blockgroup_lock)
3524 goto out_free_base;
3525
3526 sb->s_fs_info = sbi;
3527 sbi->s_sb = sb;
3528 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
3529 sbi->s_sb_block = sb_block;
3530 if (sb->s_bdev->bd_part)
3531 sbi->s_sectors_written_start =
3532 part_stat_read(sb->s_bdev->bd_part, sectors[STAT_WRITE]);
3533
3534 /* Cleanup superblock name */
3535 strreplace(sb->s_id, '/', '!');
3536
3537 /* -EINVAL is default */
3538 ret = -EINVAL;
3539 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
3540 if (!blocksize) {
3541 ext4_msg(sb, KERN_ERR, "unable to set blocksize");
3542 goto out_fail;
3543 }
3544
3545 /*
3546 * The ext4 superblock will not be buffer aligned for other than 1kB
3547 * block sizes. We need to calculate the offset from buffer start.
3548 */
3549 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
3550 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3551 offset = do_div(logical_sb_block, blocksize);
3552 } else {
3553 logical_sb_block = sb_block;
3554 }
3555
3556 if (!(bh = sb_bread_unmovable(sb, logical_sb_block))) {
3557 ext4_msg(sb, KERN_ERR, "unable to read superblock");
3558 goto out_fail;
3559 }
3560 /*
3561 * Note: s_es must be initialized as soon as possible because
3562 * some ext4 macro-instructions depend on its value
3563 */
3564 es = (struct ext4_super_block *) (bh->b_data + offset);
3565 sbi->s_es = es;
3566 sb->s_magic = le16_to_cpu(es->s_magic);
3567 if (sb->s_magic != EXT4_SUPER_MAGIC)
3568 goto cantfind_ext4;
3569 sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
3570
3571 /* Warn if metadata_csum and gdt_csum are both set. */
3572 if (ext4_has_feature_metadata_csum(sb) &&
3573 ext4_has_feature_gdt_csum(sb))
3574 ext4_warning(sb, "metadata_csum and uninit_bg are "
3575 "redundant flags; please run fsck.");
3576
3577 /* Check for a known checksum algorithm */
3578 if (!ext4_verify_csum_type(sb, es)) {
3579 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3580 "unknown checksum algorithm.");
3581 silent = 1;
3582 goto cantfind_ext4;
3583 }
3584
3585 /* Load the checksum driver */
3586 sbi->s_chksum_driver = crypto_alloc_shash("crc32c", 0, 0);
3587 if (IS_ERR(sbi->s_chksum_driver)) {
3588 ext4_msg(sb, KERN_ERR, "Cannot load crc32c driver.");
3589 ret = PTR_ERR(sbi->s_chksum_driver);
3590 sbi->s_chksum_driver = NULL;
3591 goto failed_mount;
3592 }
3593
3594 /* Check superblock checksum */
3595 if (!ext4_superblock_csum_verify(sb, es)) {
3596 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3597 "invalid superblock checksum. Run e2fsck?");
3598 silent = 1;
3599 ret = -EFSBADCRC;
3600 goto cantfind_ext4;
3601 }
3602
3603 /* Precompute checksum seed for all metadata */
3604 if (ext4_has_feature_csum_seed(sb))
3605 sbi->s_csum_seed = le32_to_cpu(es->s_checksum_seed);
3606 else if (ext4_has_metadata_csum(sb) || ext4_has_feature_ea_inode(sb))
3607 sbi->s_csum_seed = ext4_chksum(sbi, ~0, es->s_uuid,
3608 sizeof(es->s_uuid));
3609
3610 /* Set defaults before we parse the mount options */
3611 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
3612 set_opt(sb, INIT_INODE_TABLE);
3613 if (def_mount_opts & EXT4_DEFM_DEBUG)
3614 set_opt(sb, DEBUG);
3615 if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
3616 set_opt(sb, GRPID);
3617 if (def_mount_opts & EXT4_DEFM_UID16)
3618 set_opt(sb, NO_UID32);
3619 /* xattr user namespace & acls are now defaulted on */
3620 set_opt(sb, XATTR_USER);
3621 #ifdef CONFIG_EXT4_FS_POSIX_ACL
3622 set_opt(sb, POSIX_ACL);
3623 #endif
3624 /* don't forget to enable journal_csum when metadata_csum is enabled. */
3625 if (ext4_has_metadata_csum(sb))
3626 set_opt(sb, JOURNAL_CHECKSUM);
3627
3628 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
3629 set_opt(sb, JOURNAL_DATA);
3630 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
3631 set_opt(sb, ORDERED_DATA);
3632 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
3633 set_opt(sb, WRITEBACK_DATA);
3634
3635 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
3636 set_opt(sb, ERRORS_PANIC);
3637 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
3638 set_opt(sb, ERRORS_CONT);
3639 else
3640 set_opt(sb, ERRORS_RO);
3641 /* block_validity enabled by default; disable with noblock_validity */
3642 set_opt(sb, BLOCK_VALIDITY);
3643 if (def_mount_opts & EXT4_DEFM_DISCARD)
3644 set_opt(sb, DISCARD);
3645
3646 sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));
3647 sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid));
3648 sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
3649 sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
3650 sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
3651
3652 if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0)
3653 set_opt(sb, BARRIER);
3654
3655 /*
3656 * enable delayed allocation by default
3657 * Use -o nodelalloc to turn it off
3658 */
3659 if (!IS_EXT3_SB(sb) && !IS_EXT2_SB(sb) &&
3660 ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0))
3661 set_opt(sb, DELALLOC);
3662
3663 /*
3664 * set default s_li_wait_mult for lazyinit, for the case there is
3665 * no mount option specified.
3666 */
3667 sbi->s_li_wait_mult = EXT4_DEF_LI_WAIT_MULT;
3668
3669 if (sbi->s_es->s_mount_opts[0]) {
3670 char *s_mount_opts = kstrndup(sbi->s_es->s_mount_opts,
3671 sizeof(sbi->s_es->s_mount_opts),
3672 GFP_KERNEL);
3673 if (!s_mount_opts)
3674 goto failed_mount;
3675 if (!parse_options(s_mount_opts, sb, &journal_devnum,
3676 &journal_ioprio, 0)) {
3677 ext4_msg(sb, KERN_WARNING,
3678 "failed to parse options in superblock: %s",
3679 s_mount_opts);
3680 }
3681 kfree(s_mount_opts);
3682 }
3683 sbi->s_def_mount_opt = sbi->s_mount_opt;
3684 if (!parse_options((char *) data, sb, &journal_devnum,
3685 &journal_ioprio, 0))
3686 goto failed_mount;
3687
3688 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
3689 printk_once(KERN_WARNING "EXT4-fs: Warning: mounting "
3690 "with data=journal disables delayed "
3691 "allocation and O_DIRECT support!\n");
3692 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
3693 ext4_msg(sb, KERN_ERR, "can't mount with "
3694 "both data=journal and delalloc");
3695 goto failed_mount;
3696 }
3697 if (test_opt(sb, DIOREAD_NOLOCK)) {
3698 ext4_msg(sb, KERN_ERR, "can't mount with "
3699 "both data=journal and dioread_nolock");
3700 goto failed_mount;
3701 }
3702 if (test_opt(sb, DAX)) {
3703 ext4_msg(sb, KERN_ERR, "can't mount with "
3704 "both data=journal and dax");
3705 goto failed_mount;
3706 }
3707 if (ext4_has_feature_encrypt(sb)) {
3708 ext4_msg(sb, KERN_WARNING,
3709 "encrypted files will use data=ordered "
3710 "instead of data journaling mode");
3711 }
3712 if (test_opt(sb, DELALLOC))
3713 clear_opt(sb, DELALLOC);
3714 } else {
3715 sb->s_iflags |= SB_I_CGROUPWB;
3716 }
3717
3718 sb->s_flags = (sb->s_flags & ~SB_POSIXACL) |
3719 (test_opt(sb, POSIX_ACL) ? SB_POSIXACL : 0);
3720
3721 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
3722 (ext4_has_compat_features(sb) ||
3723 ext4_has_ro_compat_features(sb) ||
3724 ext4_has_incompat_features(sb)))
3725 ext4_msg(sb, KERN_WARNING,
3726 "feature flags set on rev 0 fs, "
3727 "running e2fsck is recommended");
3728
3729 if (es->s_creator_os == cpu_to_le32(EXT4_OS_HURD)) {
3730 set_opt2(sb, HURD_COMPAT);
3731 if (ext4_has_feature_64bit(sb)) {
3732 ext4_msg(sb, KERN_ERR,
3733 "The Hurd can't support 64-bit file systems");
3734 goto failed_mount;
3735 }
3736
3737 /*
3738 * ea_inode feature uses l_i_version field which is not
3739 * available in HURD_COMPAT mode.
3740 */
3741 if (ext4_has_feature_ea_inode(sb)) {
3742 ext4_msg(sb, KERN_ERR,
3743 "ea_inode feature is not supported for Hurd");
3744 goto failed_mount;
3745 }
3746 }
3747
3748 if (IS_EXT2_SB(sb)) {
3749 if (ext2_feature_set_ok(sb))
3750 ext4_msg(sb, KERN_INFO, "mounting ext2 file system "
3751 "using the ext4 subsystem");
3752 else {
3753 /*
3754 * If we're probing be silent, if this looks like
3755 * it's actually an ext[34] filesystem.
3756 */
3757 if (silent && ext4_feature_set_ok(sb, sb_rdonly(sb)))
3758 goto failed_mount;
3759 ext4_msg(sb, KERN_ERR, "couldn't mount as ext2 due "
3760 "to feature incompatibilities");
3761 goto failed_mount;
3762 }
3763 }
3764
3765 if (IS_EXT3_SB(sb)) {
3766 if (ext3_feature_set_ok(sb))
3767 ext4_msg(sb, KERN_INFO, "mounting ext3 file system "
3768 "using the ext4 subsystem");
3769 else {
3770 /*
3771 * If we're probing be silent, if this looks like
3772 * it's actually an ext4 filesystem.
3773 */
3774 if (silent && ext4_feature_set_ok(sb, sb_rdonly(sb)))
3775 goto failed_mount;
3776 ext4_msg(sb, KERN_ERR, "couldn't mount as ext3 due "
3777 "to feature incompatibilities");
3778 goto failed_mount;
3779 }
3780 }
3781
3782 /*
3783 * Check feature flags regardless of the revision level, since we
3784 * previously didn't change the revision level when setting the flags,
3785 * so there is a chance incompat flags are set on a rev 0 filesystem.
3786 */
3787 if (!ext4_feature_set_ok(sb, (sb_rdonly(sb))))
3788 goto failed_mount;
3789
3790 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
3791 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
3792 blocksize > EXT4_MAX_BLOCK_SIZE) {
3793 ext4_msg(sb, KERN_ERR,
3794 "Unsupported filesystem blocksize %d (%d log_block_size)",
3795 blocksize, le32_to_cpu(es->s_log_block_size));
3796 goto failed_mount;
3797 }
3798 if (le32_to_cpu(es->s_log_block_size) >
3799 (EXT4_MAX_BLOCK_LOG_SIZE - EXT4_MIN_BLOCK_LOG_SIZE)) {
3800 ext4_msg(sb, KERN_ERR,
3801 "Invalid log block size: %u",
3802 le32_to_cpu(es->s_log_block_size));
3803 goto failed_mount;
3804 }
3805 if (le32_to_cpu(es->s_log_cluster_size) >
3806 (EXT4_MAX_CLUSTER_LOG_SIZE - EXT4_MIN_BLOCK_LOG_SIZE)) {
3807 ext4_msg(sb, KERN_ERR,
3808 "Invalid log cluster size: %u",
3809 le32_to_cpu(es->s_log_cluster_size));
3810 goto failed_mount;
3811 }
3812
3813 if (le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) > (blocksize / 4)) {
3814 ext4_msg(sb, KERN_ERR,
3815 "Number of reserved GDT blocks insanely large: %d",
3816 le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks));
3817 goto failed_mount;
3818 }
3819
3820 if (sbi->s_mount_opt & EXT4_MOUNT_DAX) {
3821 if (ext4_has_feature_inline_data(sb)) {
3822 ext4_msg(sb, KERN_ERR, "Cannot use DAX on a filesystem"
3823 " that may contain inline data");
3824 sbi->s_mount_opt &= ~EXT4_MOUNT_DAX;
3825 }
3826 if (!bdev_dax_supported(sb->s_bdev, blocksize)) {
3827 ext4_msg(sb, KERN_ERR,
3828 "DAX unsupported by block device. Turning off DAX.");
3829 sbi->s_mount_opt &= ~EXT4_MOUNT_DAX;
3830 }
3831 }
3832
3833 if (ext4_has_feature_encrypt(sb) && es->s_encryption_level) {
3834 ext4_msg(sb, KERN_ERR, "Unsupported encryption level %d",
3835 es->s_encryption_level);
3836 goto failed_mount;
3837 }
3838
3839 if (sb->s_blocksize != blocksize) {
3840 /* Validate the filesystem blocksize */
3841 if (!sb_set_blocksize(sb, blocksize)) {
3842 ext4_msg(sb, KERN_ERR, "bad block size %d",
3843 blocksize);
3844 goto failed_mount;
3845 }
3846
3847 brelse(bh);
3848 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3849 offset = do_div(logical_sb_block, blocksize);
3850 bh = sb_bread_unmovable(sb, logical_sb_block);
3851 if (!bh) {
3852 ext4_msg(sb, KERN_ERR,
3853 "Can't read superblock on 2nd try");
3854 goto failed_mount;
3855 }
3856 es = (struct ext4_super_block *)(bh->b_data + offset);
3857 sbi->s_es = es;
3858 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
3859 ext4_msg(sb, KERN_ERR,
3860 "Magic mismatch, very weird!");
3861 goto failed_mount;
3862 }
3863 }
3864
3865 has_huge_files = ext4_has_feature_huge_file(sb);
3866 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
3867 has_huge_files);
3868 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
3869
3870 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
3871 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
3872 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
3873 } else {
3874 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
3875 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
3876 if (sbi->s_first_ino < EXT4_GOOD_OLD_FIRST_INO) {
3877 ext4_msg(sb, KERN_ERR, "invalid first ino: %u",
3878 sbi->s_first_ino);
3879 goto failed_mount;
3880 }
3881 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
3882 (!is_power_of_2(sbi->s_inode_size)) ||
3883 (sbi->s_inode_size > blocksize)) {
3884 ext4_msg(sb, KERN_ERR,
3885 "unsupported inode size: %d",
3886 sbi->s_inode_size);
3887 goto failed_mount;
3888 }
3889 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
3890 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
3891 }
3892
3893 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
3894 if (ext4_has_feature_64bit(sb)) {
3895 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
3896 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
3897 !is_power_of_2(sbi->s_desc_size)) {
3898 ext4_msg(sb, KERN_ERR,
3899 "unsupported descriptor size %lu",
3900 sbi->s_desc_size);
3901 goto failed_mount;
3902 }
3903 } else
3904 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
3905
3906 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
3907 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
3908
3909 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
3910 if (sbi->s_inodes_per_block == 0)
3911 goto cantfind_ext4;
3912 if (sbi->s_inodes_per_group < sbi->s_inodes_per_block ||
3913 sbi->s_inodes_per_group > blocksize * 8) {
3914 ext4_msg(sb, KERN_ERR, "invalid inodes per group: %lu\n",
3915 sbi->s_blocks_per_group);
3916 goto failed_mount;
3917 }
3918 sbi->s_itb_per_group = sbi->s_inodes_per_group /
3919 sbi->s_inodes_per_block;
3920 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
3921 sbi->s_sbh = bh;
3922 sbi->s_mount_state = le16_to_cpu(es->s_state);
3923 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
3924 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
3925
3926 for (i = 0; i < 4; i++)
3927 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
3928 sbi->s_def_hash_version = es->s_def_hash_version;
3929 if (ext4_has_feature_dir_index(sb)) {
3930 i = le32_to_cpu(es->s_flags);
3931 if (i & EXT2_FLAGS_UNSIGNED_HASH)
3932 sbi->s_hash_unsigned = 3;
3933 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
3934 #ifdef __CHAR_UNSIGNED__
3935 if (!sb_rdonly(sb))
3936 es->s_flags |=
3937 cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
3938 sbi->s_hash_unsigned = 3;
3939 #else
3940 if (!sb_rdonly(sb))
3941 es->s_flags |=
3942 cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
3943 #endif
3944 }
3945 }
3946
3947 /* Handle clustersize */
3948 clustersize = BLOCK_SIZE << le32_to_cpu(es->s_log_cluster_size);
3949 has_bigalloc = ext4_has_feature_bigalloc(sb);
3950 if (has_bigalloc) {
3951 if (clustersize < blocksize) {
3952 ext4_msg(sb, KERN_ERR,
3953 "cluster size (%d) smaller than "
3954 "block size (%d)", clustersize, blocksize);
3955 goto failed_mount;
3956 }
3957 sbi->s_cluster_bits = le32_to_cpu(es->s_log_cluster_size) -
3958 le32_to_cpu(es->s_log_block_size);
3959 sbi->s_clusters_per_group =
3960 le32_to_cpu(es->s_clusters_per_group);
3961 if (sbi->s_clusters_per_group > blocksize * 8) {
3962 ext4_msg(sb, KERN_ERR,
3963 "#clusters per group too big: %lu",
3964 sbi->s_clusters_per_group);
3965 goto failed_mount;
3966 }
3967 if (sbi->s_blocks_per_group !=
3968 (sbi->s_clusters_per_group * (clustersize / blocksize))) {
3969 ext4_msg(sb, KERN_ERR, "blocks per group (%lu) and "
3970 "clusters per group (%lu) inconsistent",
3971 sbi->s_blocks_per_group,
3972 sbi->s_clusters_per_group);
3973 goto failed_mount;
3974 }
3975 } else {
3976 if (clustersize != blocksize) {
3977 ext4_msg(sb, KERN_ERR,
3978 "fragment/cluster size (%d) != "
3979 "block size (%d)", clustersize, blocksize);
3980 goto failed_mount;
3981 }
3982 if (sbi->s_blocks_per_group > blocksize * 8) {
3983 ext4_msg(sb, KERN_ERR,
3984 "#blocks per group too big: %lu",
3985 sbi->s_blocks_per_group);
3986 goto failed_mount;
3987 }
3988 sbi->s_clusters_per_group = sbi->s_blocks_per_group;
3989 sbi->s_cluster_bits = 0;
3990 }
3991 sbi->s_cluster_ratio = clustersize / blocksize;
3992
3993 /* Do we have standard group size of clustersize * 8 blocks ? */
3994 if (sbi->s_blocks_per_group == clustersize << 3)
3995 set_opt2(sb, STD_GROUP_SIZE);
3996
3997 /*
3998 * Test whether we have more sectors than will fit in sector_t,
3999 * and whether the max offset is addressable by the page cache.
4000 */
4001 err = generic_check_addressable(sb->s_blocksize_bits,
4002 ext4_blocks_count(es));
4003 if (err) {
4004 ext4_msg(sb, KERN_ERR, "filesystem"
4005 " too large to mount safely on this system");
4006 if (sizeof(sector_t) < 8)
4007 ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled");
4008 goto failed_mount;
4009 }
4010
4011 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
4012 goto cantfind_ext4;
4013
4014 /* check blocks count against device size */
4015 blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
4016 if (blocks_count && ext4_blocks_count(es) > blocks_count) {
4017 ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
4018 "exceeds size of device (%llu blocks)",
4019 ext4_blocks_count(es), blocks_count);
4020 goto failed_mount;
4021 }
4022
4023 /*
4024 * It makes no sense for the first data block to be beyond the end
4025 * of the filesystem.
4026 */
4027 if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
4028 ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
4029 "block %u is beyond end of filesystem (%llu)",
4030 le32_to_cpu(es->s_first_data_block),
4031 ext4_blocks_count(es));
4032 goto failed_mount;
4033 }
4034 if ((es->s_first_data_block == 0) && (es->s_log_block_size == 0) &&
4035 (sbi->s_cluster_ratio == 1)) {
4036 ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
4037 "block is 0 with a 1k block and cluster size");
4038 goto failed_mount;
4039 }
4040
4041 blocks_count = (ext4_blocks_count(es) -
4042 le32_to_cpu(es->s_first_data_block) +
4043 EXT4_BLOCKS_PER_GROUP(sb) - 1);
4044 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
4045 if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
4046 ext4_msg(sb, KERN_WARNING, "groups count too large: %u "
4047 "(block count %llu, first data block %u, "
4048 "blocks per group %lu)", sbi->s_groups_count,
4049 ext4_blocks_count(es),
4050 le32_to_cpu(es->s_first_data_block),
4051 EXT4_BLOCKS_PER_GROUP(sb));
4052 goto failed_mount;
4053 }
4054 sbi->s_groups_count = blocks_count;
4055 sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
4056 (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
4057 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
4058 EXT4_DESC_PER_BLOCK(sb);
4059 if (ext4_has_feature_meta_bg(sb)) {
4060 if (le32_to_cpu(es->s_first_meta_bg) > db_count) {
4061 ext4_msg(sb, KERN_WARNING,
4062 "first meta block group too large: %u "
4063 "(group descriptor block count %u)",
4064 le32_to_cpu(es->s_first_meta_bg), db_count);
4065 goto failed_mount;
4066 }
4067 }
4068 sbi->s_group_desc = kvmalloc_array(db_count,
4069 sizeof(struct buffer_head *),
4070 GFP_KERNEL);
4071 if (sbi->s_group_desc == NULL) {
4072 ext4_msg(sb, KERN_ERR, "not enough memory");
4073 ret = -ENOMEM;
4074 goto failed_mount;
4075 }
4076 if (((u64)sbi->s_groups_count * sbi->s_inodes_per_group) !=
4077 le32_to_cpu(es->s_inodes_count)) {
4078 ext4_msg(sb, KERN_ERR, "inodes count not valid: %u vs %llu",
4079 le32_to_cpu(es->s_inodes_count),
4080 ((u64)sbi->s_groups_count * sbi->s_inodes_per_group));
4081 ret = -EINVAL;
4082 goto failed_mount;
4083 }
4084
4085 bgl_lock_init(sbi->s_blockgroup_lock);
4086
4087 /* Pre-read the descriptors into the buffer cache */
4088 for (i = 0; i < db_count; i++) {
4089 block = descriptor_loc(sb, logical_sb_block, i);
4090 sb_breadahead(sb, block);
4091 }
4092
4093 for (i = 0; i < db_count; i++) {
4094 block = descriptor_loc(sb, logical_sb_block, i);
4095 sbi->s_group_desc[i] = sb_bread_unmovable(sb, block);
4096 if (!sbi->s_group_desc[i]) {
4097 ext4_msg(sb, KERN_ERR,
4098 "can't read group descriptor %d", i);
4099 db_count = i;
4100 goto failed_mount2;
4101 }
4102 }
4103 sbi->s_gdb_count = db_count;
4104 if (!ext4_check_descriptors(sb, logical_sb_block, &first_not_zeroed)) {
4105 ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
4106 ret = -EFSCORRUPTED;
4107 goto failed_mount2;
4108 }
4109
4110 timer_setup(&sbi->s_err_report, print_daily_error_info, 0);
4111
4112 /* Register extent status tree shrinker */
4113 if (ext4_es_register_shrinker(sbi))
4114 goto failed_mount3;
4115
4116 sbi->s_stripe = ext4_get_stripe_size(sbi);
4117 sbi->s_extent_max_zeroout_kb = 32;
4118
4119 /*
4120 * set up enough so that it can read an inode
4121 */
4122 sb->s_op = &ext4_sops;
4123 sb->s_export_op = &ext4_export_ops;
4124 sb->s_xattr = ext4_xattr_handlers;
4125 #ifdef CONFIG_EXT4_FS_ENCRYPTION
4126 sb->s_cop = &ext4_cryptops;
4127 #endif
4128 #ifdef CONFIG_QUOTA
4129 sb->dq_op = &ext4_quota_operations;
4130 if (ext4_has_feature_quota(sb))
4131 sb->s_qcop = &dquot_quotactl_sysfile_ops;
4132 else
4133 sb->s_qcop = &ext4_qctl_operations;
4134 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP | QTYPE_MASK_PRJ;
4135 #endif
4136 memcpy(&sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
4137
4138 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
4139 mutex_init(&sbi->s_orphan_lock);
4140
4141 sb->s_root = NULL;
4142
4143 needs_recovery = (es->s_last_orphan != 0 ||
4144 ext4_has_feature_journal_needs_recovery(sb));
4145
4146 if (ext4_has_feature_mmp(sb) && !sb_rdonly(sb))
4147 if (ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block)))
4148 goto failed_mount3a;
4149
4150 /*
4151 * The first inode we look at is the journal inode. Don't try
4152 * root first: it may be modified in the journal!
4153 */
4154 if (!test_opt(sb, NOLOAD) && ext4_has_feature_journal(sb)) {
4155 err = ext4_load_journal(sb, es, journal_devnum);
4156 if (err)
4157 goto failed_mount3a;
4158 } else if (test_opt(sb, NOLOAD) && !sb_rdonly(sb) &&
4159 ext4_has_feature_journal_needs_recovery(sb)) {
4160 ext4_msg(sb, KERN_ERR, "required journal recovery "
4161 "suppressed and not mounted read-only");
4162 goto failed_mount_wq;
4163 } else {
4164 /* Nojournal mode, all journal mount options are illegal */
4165 if (test_opt2(sb, EXPLICIT_JOURNAL_CHECKSUM)) {
4166 ext4_msg(sb, KERN_ERR, "can't mount with "
4167 "journal_checksum, fs mounted w/o journal");
4168 goto failed_mount_wq;
4169 }
4170 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
4171 ext4_msg(sb, KERN_ERR, "can't mount with "
4172 "journal_async_commit, fs mounted w/o journal");
4173 goto failed_mount_wq;
4174 }
4175 if (sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) {
4176 ext4_msg(sb, KERN_ERR, "can't mount with "
4177 "commit=%lu, fs mounted w/o journal",
4178 sbi->s_commit_interval / HZ);
4179 goto failed_mount_wq;
4180 }
4181 if (EXT4_MOUNT_DATA_FLAGS &
4182 (sbi->s_mount_opt ^ sbi->s_def_mount_opt)) {
4183 ext4_msg(sb, KERN_ERR, "can't mount with "
4184 "data=, fs mounted w/o journal");
4185 goto failed_mount_wq;
4186 }
4187 sbi->s_def_mount_opt &= EXT4_MOUNT_JOURNAL_CHECKSUM;
4188 clear_opt(sb, JOURNAL_CHECKSUM);
4189 clear_opt(sb, DATA_FLAGS);
4190 sbi->s_journal = NULL;
4191 needs_recovery = 0;
4192 goto no_journal;
4193 }
4194
4195 if (ext4_has_feature_64bit(sb) &&
4196 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
4197 JBD2_FEATURE_INCOMPAT_64BIT)) {
4198 ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
4199 goto failed_mount_wq;
4200 }
4201
4202 if (!set_journal_csum_feature_set(sb)) {
4203 ext4_msg(sb, KERN_ERR, "Failed to set journal checksum "
4204 "feature set");
4205 goto failed_mount_wq;
4206 }
4207
4208 /* We have now updated the journal if required, so we can
4209 * validate the data journaling mode. */
4210 switch (test_opt(sb, DATA_FLAGS)) {
4211 case 0:
4212 /* No mode set, assume a default based on the journal
4213 * capabilities: ORDERED_DATA if the journal can
4214 * cope, else JOURNAL_DATA
4215 */
4216 if (jbd2_journal_check_available_features
4217 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
4218 set_opt(sb, ORDERED_DATA);
4219 sbi->s_def_mount_opt |= EXT4_MOUNT_ORDERED_DATA;
4220 } else {
4221 set_opt(sb, JOURNAL_DATA);
4222 sbi->s_def_mount_opt |= EXT4_MOUNT_JOURNAL_DATA;
4223 }
4224 break;
4225
4226 case EXT4_MOUNT_ORDERED_DATA:
4227 case EXT4_MOUNT_WRITEBACK_DATA:
4228 if (!jbd2_journal_check_available_features
4229 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
4230 ext4_msg(sb, KERN_ERR, "Journal does not support "
4231 "requested data journaling mode");
4232 goto failed_mount_wq;
4233 }
4234 default:
4235 break;
4236 }
4237
4238 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA &&
4239 test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
4240 ext4_msg(sb, KERN_ERR, "can't mount with "
4241 "journal_async_commit in data=ordered mode");
4242 goto failed_mount_wq;
4243 }
4244
4245 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
4246
4247 sbi->s_journal->j_commit_callback = ext4_journal_commit_callback;
4248
4249 no_journal:
4250 if (!test_opt(sb, NO_MBCACHE)) {
4251 sbi->s_ea_block_cache = ext4_xattr_create_cache();
4252 if (!sbi->s_ea_block_cache) {
4253 ext4_msg(sb, KERN_ERR,
4254 "Failed to create ea_block_cache");
4255 goto failed_mount_wq;
4256 }
4257
4258 if (ext4_has_feature_ea_inode(sb)) {
4259 sbi->s_ea_inode_cache = ext4_xattr_create_cache();
4260 if (!sbi->s_ea_inode_cache) {
4261 ext4_msg(sb, KERN_ERR,
4262 "Failed to create ea_inode_cache");
4263 goto failed_mount_wq;
4264 }
4265 }
4266 }
4267
4268 if ((DUMMY_ENCRYPTION_ENABLED(sbi) || ext4_has_feature_encrypt(sb)) &&
4269 (blocksize != PAGE_SIZE)) {
4270 ext4_msg(sb, KERN_ERR,
4271 "Unsupported blocksize for fs encryption");
4272 goto failed_mount_wq;
4273 }
4274
4275 if (DUMMY_ENCRYPTION_ENABLED(sbi) && !sb_rdonly(sb) &&
4276 !ext4_has_feature_encrypt(sb)) {
4277 ext4_set_feature_encrypt(sb);
4278 ext4_commit_super(sb, 1);
4279 }
4280
4281 /*
4282 * Get the # of file system overhead blocks from the
4283 * superblock if present.
4284 */
4285 if (es->s_overhead_clusters)
4286 sbi->s_overhead = le32_to_cpu(es->s_overhead_clusters);
4287 else {
4288 err = ext4_calculate_overhead(sb);
4289 if (err)
4290 goto failed_mount_wq;
4291 }
4292
4293 /*
4294 * The maximum number of concurrent works can be high and
4295 * concurrency isn't really necessary. Limit it to 1.
4296 */
4297 EXT4_SB(sb)->rsv_conversion_wq =
4298 alloc_workqueue("ext4-rsv-conversion", WQ_MEM_RECLAIM | WQ_UNBOUND, 1);
4299 if (!EXT4_SB(sb)->rsv_conversion_wq) {
4300 printk(KERN_ERR "EXT4-fs: failed to create workqueue\n");
4301 ret = -ENOMEM;
4302 goto failed_mount4;
4303 }
4304
4305 /*
4306 * The jbd2_journal_load will have done any necessary log recovery,
4307 * so we can safely mount the rest of the filesystem now.
4308 */
4309
4310 root = ext4_iget(sb, EXT4_ROOT_INO);
4311 if (IS_ERR(root)) {
4312 ext4_msg(sb, KERN_ERR, "get root inode failed");
4313 ret = PTR_ERR(root);
4314 root = NULL;
4315 goto failed_mount4;
4316 }
4317 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
4318 ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
4319 iput(root);
4320 goto failed_mount4;
4321 }
4322 sb->s_root = d_make_root(root);
4323 if (!sb->s_root) {
4324 ext4_msg(sb, KERN_ERR, "get root dentry failed");
4325 ret = -ENOMEM;
4326 goto failed_mount4;
4327 }
4328
4329 ret = ext4_setup_super(sb, es, sb_rdonly(sb));
4330 if (ret == -EROFS) {
4331 sb->s_flags |= SB_RDONLY;
4332 ret = 0;
4333 } else if (ret)
4334 goto failed_mount4a;
4335
4336 /* determine the minimum size of new large inodes, if present */
4337 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE &&
4338 sbi->s_want_extra_isize == 0) {
4339 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
4340 EXT4_GOOD_OLD_INODE_SIZE;
4341 if (ext4_has_feature_extra_isize(sb)) {
4342 if (sbi->s_want_extra_isize <
4343 le16_to_cpu(es->s_want_extra_isize))
4344 sbi->s_want_extra_isize =
4345 le16_to_cpu(es->s_want_extra_isize);
4346 if (sbi->s_want_extra_isize <
4347 le16_to_cpu(es->s_min_extra_isize))
4348 sbi->s_want_extra_isize =
4349 le16_to_cpu(es->s_min_extra_isize);
4350 }
4351 }
4352 /* Check if enough inode space is available */
4353 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
4354 sbi->s_inode_size) {
4355 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
4356 EXT4_GOOD_OLD_INODE_SIZE;
4357 ext4_msg(sb, KERN_INFO, "required extra inode space not"
4358 "available");
4359 }
4360
4361 ext4_set_resv_clusters(sb);
4362
4363 err = ext4_setup_system_zone(sb);
4364 if (err) {
4365 ext4_msg(sb, KERN_ERR, "failed to initialize system "
4366 "zone (%d)", err);
4367 goto failed_mount4a;
4368 }
4369
4370 ext4_ext_init(sb);
4371 err = ext4_mb_init(sb);
4372 if (err) {
4373 ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)",
4374 err);
4375 goto failed_mount5;
4376 }
4377
4378 block = ext4_count_free_clusters(sb);
4379 ext4_free_blocks_count_set(sbi->s_es,
4380 EXT4_C2B(sbi, block));
4381 err = percpu_counter_init(&sbi->s_freeclusters_counter, block,
4382 GFP_KERNEL);
4383 if (!err) {
4384 unsigned long freei = ext4_count_free_inodes(sb);
4385 sbi->s_es->s_free_inodes_count = cpu_to_le32(freei);
4386 err = percpu_counter_init(&sbi->s_freeinodes_counter, freei,
4387 GFP_KERNEL);
4388 }
4389 if (!err)
4390 err = percpu_counter_init(&sbi->s_dirs_counter,
4391 ext4_count_dirs(sb), GFP_KERNEL);
4392 if (!err)
4393 err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0,
4394 GFP_KERNEL);
4395 if (!err)
4396 err = percpu_init_rwsem(&sbi->s_journal_flag_rwsem);
4397
4398 if (err) {
4399 ext4_msg(sb, KERN_ERR, "insufficient memory");
4400 goto failed_mount6;
4401 }
4402
4403 if (ext4_has_feature_flex_bg(sb))
4404 if (!ext4_fill_flex_info(sb)) {
4405 ext4_msg(sb, KERN_ERR,
4406 "unable to initialize "
4407 "flex_bg meta info!");
4408 goto failed_mount6;
4409 }
4410
4411 err = ext4_register_li_request(sb, first_not_zeroed);
4412 if (err)
4413 goto failed_mount6;
4414
4415 err = ext4_register_sysfs(sb);
4416 if (err)
4417 goto failed_mount7;
4418
4419 #ifdef CONFIG_QUOTA
4420 /* Enable quota usage during mount. */
4421 if (ext4_has_feature_quota(sb) && !sb_rdonly(sb)) {
4422 err = ext4_enable_quotas(sb);
4423 if (err)
4424 goto failed_mount8;
4425 }
4426 #endif /* CONFIG_QUOTA */
4427
4428 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
4429 ext4_orphan_cleanup(sb, es);
4430 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
4431 if (needs_recovery) {
4432 ext4_msg(sb, KERN_INFO, "recovery complete");
4433 ext4_mark_recovery_complete(sb, es);
4434 }
4435 if (EXT4_SB(sb)->s_journal) {
4436 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
4437 descr = " journalled data mode";
4438 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
4439 descr = " ordered data mode";
4440 else
4441 descr = " writeback data mode";
4442 } else
4443 descr = "out journal";
4444
4445 if (test_opt(sb, DISCARD)) {
4446 struct request_queue *q = bdev_get_queue(sb->s_bdev);
4447 if (!blk_queue_discard(q))
4448 ext4_msg(sb, KERN_WARNING,
4449 "mounting with \"discard\" option, but "
4450 "the device does not support discard");
4451 }
4452
4453 if (___ratelimit(&ext4_mount_msg_ratelimit, "EXT4-fs mount"))
4454 ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. "
4455 "Opts: %.*s%s%s", descr,
4456 (int) sizeof(sbi->s_es->s_mount_opts),
4457 sbi->s_es->s_mount_opts,
4458 *sbi->s_es->s_mount_opts ? "; " : "", orig_data);
4459
4460 if (es->s_error_count)
4461 mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */
4462
4463 /* Enable message ratelimiting. Default is 10 messages per 5 secs. */
4464 ratelimit_state_init(&sbi->s_err_ratelimit_state, 5 * HZ, 10);
4465 ratelimit_state_init(&sbi->s_warning_ratelimit_state, 5 * HZ, 10);
4466 ratelimit_state_init(&sbi->s_msg_ratelimit_state, 5 * HZ, 10);
4467
4468 kfree(orig_data);
4469 return 0;
4470
4471 cantfind_ext4:
4472 if (!silent)
4473 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
4474 goto failed_mount;
4475
4476 #ifdef CONFIG_QUOTA
4477 failed_mount8:
4478 ext4_unregister_sysfs(sb);
4479 #endif
4480 failed_mount7:
4481 ext4_unregister_li_request(sb);
4482 failed_mount6:
4483 ext4_mb_release(sb);
4484 if (sbi->s_flex_groups)
4485 kvfree(sbi->s_flex_groups);
4486 percpu_counter_destroy(&sbi->s_freeclusters_counter);
4487 percpu_counter_destroy(&sbi->s_freeinodes_counter);
4488 percpu_counter_destroy(&sbi->s_dirs_counter);
4489 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
4490 failed_mount5:
4491 ext4_ext_release(sb);
4492 ext4_release_system_zone(sb);
4493 failed_mount4a:
4494 dput(sb->s_root);
4495 sb->s_root = NULL;
4496 failed_mount4:
4497 ext4_msg(sb, KERN_ERR, "mount failed");
4498 if (EXT4_SB(sb)->rsv_conversion_wq)
4499 destroy_workqueue(EXT4_SB(sb)->rsv_conversion_wq);
4500 failed_mount_wq:
4501 if (sbi->s_ea_inode_cache) {
4502 ext4_xattr_destroy_cache(sbi->s_ea_inode_cache);
4503 sbi->s_ea_inode_cache = NULL;
4504 }
4505 if (sbi->s_ea_block_cache) {
4506 ext4_xattr_destroy_cache(sbi->s_ea_block_cache);
4507 sbi->s_ea_block_cache = NULL;
4508 }
4509 if (sbi->s_journal) {
4510 jbd2_journal_destroy(sbi->s_journal);
4511 sbi->s_journal = NULL;
4512 }
4513 failed_mount3a:
4514 ext4_es_unregister_shrinker(sbi);
4515 failed_mount3:
4516 del_timer_sync(&sbi->s_err_report);
4517 if (sbi->s_mmp_tsk)
4518 kthread_stop(sbi->s_mmp_tsk);
4519 failed_mount2:
4520 for (i = 0; i < db_count; i++)
4521 brelse(sbi->s_group_desc[i]);
4522 kvfree(sbi->s_group_desc);
4523 failed_mount:
4524 if (sbi->s_chksum_driver)
4525 crypto_free_shash(sbi->s_chksum_driver);
4526 #ifdef CONFIG_QUOTA
4527 for (i = 0; i < EXT4_MAXQUOTAS; i++)
4528 kfree(sbi->s_qf_names[i]);
4529 #endif
4530 ext4_blkdev_remove(sbi);
4531 brelse(bh);
4532 out_fail:
4533 sb->s_fs_info = NULL;
4534 kfree(sbi->s_blockgroup_lock);
4535 out_free_base:
4536 kfree(sbi);
4537 kfree(orig_data);
4538 fs_put_dax(dax_dev);
4539 return err ? err : ret;
4540 }
4541
4542 /*
4543 * Setup any per-fs journal parameters now. We'll do this both on
4544 * initial mount, once the journal has been initialised but before we've
4545 * done any recovery; and again on any subsequent remount.
4546 */
4547 static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
4548 {
4549 struct ext4_sb_info *sbi = EXT4_SB(sb);
4550
4551 journal->j_commit_interval = sbi->s_commit_interval;
4552 journal->j_min_batch_time = sbi->s_min_batch_time;
4553 journal->j_max_batch_time = sbi->s_max_batch_time;
4554
4555 write_lock(&journal->j_state_lock);
4556 if (test_opt(sb, BARRIER))
4557 journal->j_flags |= JBD2_BARRIER;
4558 else
4559 journal->j_flags &= ~JBD2_BARRIER;
4560 if (test_opt(sb, DATA_ERR_ABORT))
4561 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
4562 else
4563 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
4564 write_unlock(&journal->j_state_lock);
4565 }
4566
4567 static struct inode *ext4_get_journal_inode(struct super_block *sb,
4568 unsigned int journal_inum)
4569 {
4570 struct inode *journal_inode;
4571
4572 /*
4573 * Test for the existence of a valid inode on disk. Bad things
4574 * happen if we iget() an unused inode, as the subsequent iput()
4575 * will try to delete it.
4576 */
4577 journal_inode = ext4_iget(sb, journal_inum);
4578 if (IS_ERR(journal_inode)) {
4579 ext4_msg(sb, KERN_ERR, "no journal found");
4580 return NULL;
4581 }
4582 if (!journal_inode->i_nlink) {
4583 make_bad_inode(journal_inode);
4584 iput(journal_inode);
4585 ext4_msg(sb, KERN_ERR, "journal inode is deleted");
4586 return NULL;
4587 }
4588
4589 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
4590 journal_inode, journal_inode->i_size);
4591 if (!S_ISREG(journal_inode->i_mode)) {
4592 ext4_msg(sb, KERN_ERR, "invalid journal inode");
4593 iput(journal_inode);
4594 return NULL;
4595 }
4596 return journal_inode;
4597 }
4598
4599 static journal_t *ext4_get_journal(struct super_block *sb,
4600 unsigned int journal_inum)
4601 {
4602 struct inode *journal_inode;
4603 journal_t *journal;
4604
4605 BUG_ON(!ext4_has_feature_journal(sb));
4606
4607 journal_inode = ext4_get_journal_inode(sb, journal_inum);
4608 if (!journal_inode)
4609 return NULL;
4610
4611 journal = jbd2_journal_init_inode(journal_inode);
4612 if (!journal) {
4613 ext4_msg(sb, KERN_ERR, "Could not load journal inode");
4614 iput(journal_inode);
4615 return NULL;
4616 }
4617 journal->j_private = sb;
4618 ext4_init_journal_params(sb, journal);
4619 return journal;
4620 }
4621
4622 static journal_t *ext4_get_dev_journal(struct super_block *sb,
4623 dev_t j_dev)
4624 {
4625 struct buffer_head *bh;
4626 journal_t *journal;
4627 ext4_fsblk_t start;
4628 ext4_fsblk_t len;
4629 int hblock, blocksize;
4630 ext4_fsblk_t sb_block;
4631 unsigned long offset;
4632 struct ext4_super_block *es;
4633 struct block_device *bdev;
4634
4635 BUG_ON(!ext4_has_feature_journal(sb));
4636
4637 bdev = ext4_blkdev_get(j_dev, sb);
4638 if (bdev == NULL)
4639 return NULL;
4640
4641 blocksize = sb->s_blocksize;
4642 hblock = bdev_logical_block_size(bdev);
4643 if (blocksize < hblock) {
4644 ext4_msg(sb, KERN_ERR,
4645 "blocksize too small for journal device");
4646 goto out_bdev;
4647 }
4648
4649 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
4650 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
4651 set_blocksize(bdev, blocksize);
4652 if (!(bh = __bread(bdev, sb_block, blocksize))) {
4653 ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
4654 "external journal");
4655 goto out_bdev;
4656 }
4657
4658 es = (struct ext4_super_block *) (bh->b_data + offset);
4659 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
4660 !(le32_to_cpu(es->s_feature_incompat) &
4661 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
4662 ext4_msg(sb, KERN_ERR, "external journal has "
4663 "bad superblock");
4664 brelse(bh);
4665 goto out_bdev;
4666 }
4667
4668 if ((le32_to_cpu(es->s_feature_ro_compat) &
4669 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) &&
4670 es->s_checksum != ext4_superblock_csum(sb, es)) {
4671 ext4_msg(sb, KERN_ERR, "external journal has "
4672 "corrupt superblock");
4673 brelse(bh);
4674 goto out_bdev;
4675 }
4676
4677 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
4678 ext4_msg(sb, KERN_ERR, "journal UUID does not match");
4679 brelse(bh);
4680 goto out_bdev;
4681 }
4682
4683 len = ext4_blocks_count(es);
4684 start = sb_block + 1;
4685 brelse(bh); /* we're done with the superblock */
4686
4687 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
4688 start, len, blocksize);
4689 if (!journal) {
4690 ext4_msg(sb, KERN_ERR, "failed to create device journal");
4691 goto out_bdev;
4692 }
4693 journal->j_private = sb;
4694 ll_rw_block(REQ_OP_READ, REQ_META | REQ_PRIO, 1, &journal->j_sb_buffer);
4695 wait_on_buffer(journal->j_sb_buffer);
4696 if (!buffer_uptodate(journal->j_sb_buffer)) {
4697 ext4_msg(sb, KERN_ERR, "I/O error on journal device");
4698 goto out_journal;
4699 }
4700 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
4701 ext4_msg(sb, KERN_ERR, "External journal has more than one "
4702 "user (unsupported) - %d",
4703 be32_to_cpu(journal->j_superblock->s_nr_users));
4704 goto out_journal;
4705 }
4706 EXT4_SB(sb)->journal_bdev = bdev;
4707 ext4_init_journal_params(sb, journal);
4708 return journal;
4709
4710 out_journal:
4711 jbd2_journal_destroy(journal);
4712 out_bdev:
4713 ext4_blkdev_put(bdev);
4714 return NULL;
4715 }
4716
4717 static int ext4_load_journal(struct super_block *sb,
4718 struct ext4_super_block *es,
4719 unsigned long journal_devnum)
4720 {
4721 journal_t *journal;
4722 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
4723 dev_t journal_dev;
4724 int err = 0;
4725 int really_read_only;
4726
4727 BUG_ON(!ext4_has_feature_journal(sb));
4728
4729 if (journal_devnum &&
4730 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
4731 ext4_msg(sb, KERN_INFO, "external journal device major/minor "
4732 "numbers have changed");
4733 journal_dev = new_decode_dev(journal_devnum);
4734 } else
4735 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
4736
4737 really_read_only = bdev_read_only(sb->s_bdev);
4738
4739 /*
4740 * Are we loading a blank journal or performing recovery after a
4741 * crash? For recovery, we need to check in advance whether we
4742 * can get read-write access to the device.
4743 */
4744 if (ext4_has_feature_journal_needs_recovery(sb)) {
4745 if (sb_rdonly(sb)) {
4746 ext4_msg(sb, KERN_INFO, "INFO: recovery "
4747 "required on readonly filesystem");
4748 if (really_read_only) {
4749 ext4_msg(sb, KERN_ERR, "write access "
4750 "unavailable, cannot proceed "
4751 "(try mounting with noload)");
4752 return -EROFS;
4753 }
4754 ext4_msg(sb, KERN_INFO, "write access will "
4755 "be enabled during recovery");
4756 }
4757 }
4758
4759 if (journal_inum && journal_dev) {
4760 ext4_msg(sb, KERN_ERR, "filesystem has both journal "
4761 "and inode journals!");
4762 return -EINVAL;
4763 }
4764
4765 if (journal_inum) {
4766 if (!(journal = ext4_get_journal(sb, journal_inum)))
4767 return -EINVAL;
4768 } else {
4769 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
4770 return -EINVAL;
4771 }
4772
4773 if (!(journal->j_flags & JBD2_BARRIER))
4774 ext4_msg(sb, KERN_INFO, "barriers disabled");
4775
4776 if (!ext4_has_feature_journal_needs_recovery(sb))
4777 err = jbd2_journal_wipe(journal, !really_read_only);
4778 if (!err) {
4779 char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL);
4780 if (save)
4781 memcpy(save, ((char *) es) +
4782 EXT4_S_ERR_START, EXT4_S_ERR_LEN);
4783 err = jbd2_journal_load(journal);
4784 if (save)
4785 memcpy(((char *) es) + EXT4_S_ERR_START,
4786 save, EXT4_S_ERR_LEN);
4787 kfree(save);
4788 }
4789
4790 if (err) {
4791 ext4_msg(sb, KERN_ERR, "error loading journal");
4792 jbd2_journal_destroy(journal);
4793 return err;
4794 }
4795
4796 EXT4_SB(sb)->s_journal = journal;
4797 ext4_clear_journal_err(sb, es);
4798
4799 if (!really_read_only && journal_devnum &&
4800 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
4801 es->s_journal_dev = cpu_to_le32(journal_devnum);
4802
4803 /* Make sure we flush the recovery flag to disk. */
4804 ext4_commit_super(sb, 1);
4805 }
4806
4807 return 0;
4808 }
4809
4810 static int ext4_commit_super(struct super_block *sb, int sync)
4811 {
4812 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
4813 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
4814 int error = 0;
4815
4816 if (!sbh || block_device_ejected(sb))
4817 return error;
4818
4819 /*
4820 * The superblock bh should be mapped, but it might not be if the
4821 * device was hot-removed. Not much we can do but fail the I/O.
4822 */
4823 if (!buffer_mapped(sbh))
4824 return error;
4825
4826 /*
4827 * If the file system is mounted read-only, don't update the
4828 * superblock write time. This avoids updating the superblock
4829 * write time when we are mounting the root file system
4830 * read/only but we need to replay the journal; at that point,
4831 * for people who are east of GMT and who make their clock
4832 * tick in localtime for Windows bug-for-bug compatibility,
4833 * the clock is set in the future, and this will cause e2fsck
4834 * to complain and force a full file system check.
4835 */
4836 if (!(sb->s_flags & SB_RDONLY))
4837 ext4_update_tstamp(es, s_wtime);
4838 if (sb->s_bdev->bd_part)
4839 es->s_kbytes_written =
4840 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written +
4841 ((part_stat_read(sb->s_bdev->bd_part,
4842 sectors[STAT_WRITE]) -
4843 EXT4_SB(sb)->s_sectors_written_start) >> 1));
4844 else
4845 es->s_kbytes_written =
4846 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written);
4847 if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeclusters_counter))
4848 ext4_free_blocks_count_set(es,
4849 EXT4_C2B(EXT4_SB(sb), percpu_counter_sum_positive(
4850 &EXT4_SB(sb)->s_freeclusters_counter)));
4851 if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeinodes_counter))
4852 es->s_free_inodes_count =
4853 cpu_to_le32(percpu_counter_sum_positive(
4854 &EXT4_SB(sb)->s_freeinodes_counter));
4855 BUFFER_TRACE(sbh, "marking dirty");
4856 ext4_superblock_csum_set(sb);
4857 if (sync)
4858 lock_buffer(sbh);
4859 if (buffer_write_io_error(sbh)) {
4860 /*
4861 * Oh, dear. A previous attempt to write the
4862 * superblock failed. This could happen because the
4863 * USB device was yanked out. Or it could happen to
4864 * be a transient write error and maybe the block will
4865 * be remapped. Nothing we can do but to retry the
4866 * write and hope for the best.
4867 */
4868 ext4_msg(sb, KERN_ERR, "previous I/O error to "
4869 "superblock detected");
4870 clear_buffer_write_io_error(sbh);
4871 set_buffer_uptodate(sbh);
4872 }
4873 mark_buffer_dirty(sbh);
4874 if (sync) {
4875 unlock_buffer(sbh);
4876 error = __sync_dirty_buffer(sbh,
4877 REQ_SYNC | (test_opt(sb, BARRIER) ? REQ_FUA : 0));
4878 if (buffer_write_io_error(sbh)) {
4879 ext4_msg(sb, KERN_ERR, "I/O error while writing "
4880 "superblock");
4881 clear_buffer_write_io_error(sbh);
4882 set_buffer_uptodate(sbh);
4883 }
4884 }
4885 return error;
4886 }
4887
4888 /*
4889 * Have we just finished recovery? If so, and if we are mounting (or
4890 * remounting) the filesystem readonly, then we will end up with a
4891 * consistent fs on disk. Record that fact.
4892 */
4893 static void ext4_mark_recovery_complete(struct super_block *sb,
4894 struct ext4_super_block *es)
4895 {
4896 journal_t *journal = EXT4_SB(sb)->s_journal;
4897
4898 if (!ext4_has_feature_journal(sb)) {
4899 BUG_ON(journal != NULL);
4900 return;
4901 }
4902 jbd2_journal_lock_updates(journal);
4903 if (jbd2_journal_flush(journal) < 0)
4904 goto out;
4905
4906 if (ext4_has_feature_journal_needs_recovery(sb) && sb_rdonly(sb)) {
4907 ext4_clear_feature_journal_needs_recovery(sb);
4908 ext4_commit_super(sb, 1);
4909 }
4910
4911 out:
4912 jbd2_journal_unlock_updates(journal);
4913 }
4914
4915 /*
4916 * If we are mounting (or read-write remounting) a filesystem whose journal
4917 * has recorded an error from a previous lifetime, move that error to the
4918 * main filesystem now.
4919 */
4920 static void ext4_clear_journal_err(struct super_block *sb,
4921 struct ext4_super_block *es)
4922 {
4923 journal_t *journal;
4924 int j_errno;
4925 const char *errstr;
4926
4927 BUG_ON(!ext4_has_feature_journal(sb));
4928
4929 journal = EXT4_SB(sb)->s_journal;
4930
4931 /*
4932 * Now check for any error status which may have been recorded in the
4933 * journal by a prior ext4_error() or ext4_abort()
4934 */
4935
4936 j_errno = jbd2_journal_errno(journal);
4937 if (j_errno) {
4938 char nbuf[16];
4939
4940 errstr = ext4_decode_error(sb, j_errno, nbuf);
4941 ext4_warning(sb, "Filesystem error recorded "
4942 "from previous mount: %s", errstr);
4943 ext4_warning(sb, "Marking fs in need of filesystem check.");
4944
4945 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
4946 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
4947 ext4_commit_super(sb, 1);
4948
4949 jbd2_journal_clear_err(journal);
4950 jbd2_journal_update_sb_errno(journal);
4951 }
4952 }
4953
4954 /*
4955 * Force the running and committing transactions to commit,
4956 * and wait on the commit.
4957 */
4958 int ext4_force_commit(struct super_block *sb)
4959 {
4960 journal_t *journal;
4961
4962 if (sb_rdonly(sb))
4963 return 0;
4964
4965 journal = EXT4_SB(sb)->s_journal;
4966 return ext4_journal_force_commit(journal);
4967 }
4968
4969 static int ext4_sync_fs(struct super_block *sb, int wait)
4970 {
4971 int ret = 0;
4972 tid_t target;
4973 bool needs_barrier = false;
4974 struct ext4_sb_info *sbi = EXT4_SB(sb);
4975
4976 if (unlikely(ext4_forced_shutdown(sbi)))
4977 return 0;
4978
4979 trace_ext4_sync_fs(sb, wait);
4980 flush_workqueue(sbi->rsv_conversion_wq);
4981 /*
4982 * Writeback quota in non-journalled quota case - journalled quota has
4983 * no dirty dquots
4984 */
4985 dquot_writeback_dquots(sb, -1);
4986 /*
4987 * Data writeback is possible w/o journal transaction, so barrier must
4988 * being sent at the end of the function. But we can skip it if
4989 * transaction_commit will do it for us.
4990 */
4991 if (sbi->s_journal) {
4992 target = jbd2_get_latest_transaction(sbi->s_journal);
4993 if (wait && sbi->s_journal->j_flags & JBD2_BARRIER &&
4994 !jbd2_trans_will_send_data_barrier(sbi->s_journal, target))
4995 needs_barrier = true;
4996
4997 if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
4998 if (wait)
4999 ret = jbd2_log_wait_commit(sbi->s_journal,
5000 target);
5001 }
5002 } else if (wait && test_opt(sb, BARRIER))
5003 needs_barrier = true;
5004 if (needs_barrier) {
5005 int err;
5006 err = blkdev_issue_flush(sb->s_bdev, GFP_KERNEL, NULL);
5007 if (!ret)
5008 ret = err;
5009 }
5010
5011 return ret;
5012 }
5013
5014 /*
5015 * LVM calls this function before a (read-only) snapshot is created. This
5016 * gives us a chance to flush the journal completely and mark the fs clean.
5017 *
5018 * Note that only this function cannot bring a filesystem to be in a clean
5019 * state independently. It relies on upper layer to stop all data & metadata
5020 * modifications.
5021 */
5022 static int ext4_freeze(struct super_block *sb)
5023 {
5024 int error = 0;
5025 journal_t *journal;
5026
5027 if (sb_rdonly(sb))
5028 return 0;
5029
5030 journal = EXT4_SB(sb)->s_journal;
5031
5032 if (journal) {
5033 /* Now we set up the journal barrier. */
5034 jbd2_journal_lock_updates(journal);
5035
5036 /*
5037 * Don't clear the needs_recovery flag if we failed to
5038 * flush the journal.
5039 */
5040 error = jbd2_journal_flush(journal);
5041 if (error < 0)
5042 goto out;
5043
5044 /* Journal blocked and flushed, clear needs_recovery flag. */
5045 ext4_clear_feature_journal_needs_recovery(sb);
5046 }
5047
5048 error = ext4_commit_super(sb, 1);
5049 out:
5050 if (journal)
5051 /* we rely on upper layer to stop further updates */
5052 jbd2_journal_unlock_updates(journal);
5053 return error;
5054 }
5055
5056 /*
5057 * Called by LVM after the snapshot is done. We need to reset the RECOVER
5058 * flag here, even though the filesystem is not technically dirty yet.
5059 */
5060 static int ext4_unfreeze(struct super_block *sb)
5061 {
5062 if (sb_rdonly(sb) || ext4_forced_shutdown(EXT4_SB(sb)))
5063 return 0;
5064
5065 if (EXT4_SB(sb)->s_journal) {
5066 /* Reset the needs_recovery flag before the fs is unlocked. */
5067 ext4_set_feature_journal_needs_recovery(sb);
5068 }
5069
5070 ext4_commit_super(sb, 1);
5071 return 0;
5072 }
5073
5074 /*
5075 * Structure to save mount options for ext4_remount's benefit
5076 */
5077 struct ext4_mount_options {
5078 unsigned long s_mount_opt;
5079 unsigned long s_mount_opt2;
5080 kuid_t s_resuid;
5081 kgid_t s_resgid;
5082 unsigned long s_commit_interval;
5083 u32 s_min_batch_time, s_max_batch_time;
5084 #ifdef CONFIG_QUOTA
5085 int s_jquota_fmt;
5086 char *s_qf_names[EXT4_MAXQUOTAS];
5087 #endif
5088 };
5089
5090 static int ext4_remount(struct super_block *sb, int *flags, char *data)
5091 {
5092 struct ext4_super_block *es;
5093 struct ext4_sb_info *sbi = EXT4_SB(sb);
5094 unsigned long old_sb_flags;
5095 struct ext4_mount_options old_opts;
5096 int enable_quota = 0;
5097 ext4_group_t g;
5098 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
5099 int err = 0;
5100 #ifdef CONFIG_QUOTA
5101 int i, j;
5102 #endif
5103 char *orig_data = kstrdup(data, GFP_KERNEL);
5104
5105 if (data && !orig_data)
5106 return -ENOMEM;
5107
5108 /* Store the original options */
5109 old_sb_flags = sb->s_flags;
5110 old_opts.s_mount_opt = sbi->s_mount_opt;
5111 old_opts.s_mount_opt2 = sbi->s_mount_opt2;
5112 old_opts.s_resuid = sbi->s_resuid;
5113 old_opts.s_resgid = sbi->s_resgid;
5114 old_opts.s_commit_interval = sbi->s_commit_interval;
5115 old_opts.s_min_batch_time = sbi->s_min_batch_time;
5116 old_opts.s_max_batch_time = sbi->s_max_batch_time;
5117 #ifdef CONFIG_QUOTA
5118 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
5119 for (i = 0; i < EXT4_MAXQUOTAS; i++)
5120 if (sbi->s_qf_names[i]) {
5121 old_opts.s_qf_names[i] = kstrdup(sbi->s_qf_names[i],
5122 GFP_KERNEL);
5123 if (!old_opts.s_qf_names[i]) {
5124 for (j = 0; j < i; j++)
5125 kfree(old_opts.s_qf_names[j]);
5126 kfree(orig_data);
5127 return -ENOMEM;
5128 }
5129 } else
5130 old_opts.s_qf_names[i] = NULL;
5131 #endif
5132 if (sbi->s_journal && sbi->s_journal->j_task->io_context)
5133 journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
5134
5135 if (!parse_options(data, sb, NULL, &journal_ioprio, 1)) {
5136 err = -EINVAL;
5137 goto restore_opts;
5138 }
5139
5140 if ((old_opts.s_mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) ^
5141 test_opt(sb, JOURNAL_CHECKSUM)) {
5142 ext4_msg(sb, KERN_ERR, "changing journal_checksum "
5143 "during remount not supported; ignoring");
5144 sbi->s_mount_opt ^= EXT4_MOUNT_JOURNAL_CHECKSUM;
5145 }
5146
5147 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
5148 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
5149 ext4_msg(sb, KERN_ERR, "can't mount with "
5150 "both data=journal and delalloc");
5151 err = -EINVAL;
5152 goto restore_opts;
5153 }
5154 if (test_opt(sb, DIOREAD_NOLOCK)) {
5155 ext4_msg(sb, KERN_ERR, "can't mount with "
5156 "both data=journal and dioread_nolock");
5157 err = -EINVAL;
5158 goto restore_opts;
5159 }
5160 if (test_opt(sb, DAX)) {
5161 ext4_msg(sb, KERN_ERR, "can't mount with "
5162 "both data=journal and dax");
5163 err = -EINVAL;
5164 goto restore_opts;
5165 }
5166 } else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) {
5167 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
5168 ext4_msg(sb, KERN_ERR, "can't mount with "
5169 "journal_async_commit in data=ordered mode");
5170 err = -EINVAL;
5171 goto restore_opts;
5172 }
5173 }
5174
5175 if ((sbi->s_mount_opt ^ old_opts.s_mount_opt) & EXT4_MOUNT_NO_MBCACHE) {
5176 ext4_msg(sb, KERN_ERR, "can't enable nombcache during remount");
5177 err = -EINVAL;
5178 goto restore_opts;
5179 }
5180
5181 if ((sbi->s_mount_opt ^ old_opts.s_mount_opt) & EXT4_MOUNT_DAX) {
5182 ext4_msg(sb, KERN_WARNING, "warning: refusing change of "
5183 "dax flag with busy inodes while remounting");
5184 sbi->s_mount_opt ^= EXT4_MOUNT_DAX;
5185 }
5186
5187 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
5188 ext4_abort(sb, "Abort forced by user");
5189
5190 sb->s_flags = (sb->s_flags & ~SB_POSIXACL) |
5191 (test_opt(sb, POSIX_ACL) ? SB_POSIXACL : 0);
5192
5193 es = sbi->s_es;
5194
5195 if (sbi->s_journal) {
5196 ext4_init_journal_params(sb, sbi->s_journal);
5197 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
5198 }
5199
5200 if (*flags & SB_LAZYTIME)
5201 sb->s_flags |= SB_LAZYTIME;
5202
5203 if ((bool)(*flags & SB_RDONLY) != sb_rdonly(sb)) {
5204 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) {
5205 err = -EROFS;
5206 goto restore_opts;
5207 }
5208
5209 if (*flags & SB_RDONLY) {
5210 err = sync_filesystem(sb);
5211 if (err < 0)
5212 goto restore_opts;
5213 err = dquot_suspend(sb, -1);
5214 if (err < 0)
5215 goto restore_opts;
5216
5217 /*
5218 * First of all, the unconditional stuff we have to do
5219 * to disable replay of the journal when we next remount
5220 */
5221 sb->s_flags |= SB_RDONLY;
5222
5223 /*
5224 * OK, test if we are remounting a valid rw partition
5225 * readonly, and if so set the rdonly flag and then
5226 * mark the partition as valid again.
5227 */
5228 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
5229 (sbi->s_mount_state & EXT4_VALID_FS))
5230 es->s_state = cpu_to_le16(sbi->s_mount_state);
5231
5232 if (sbi->s_journal)
5233 ext4_mark_recovery_complete(sb, es);
5234 if (sbi->s_mmp_tsk)
5235 kthread_stop(sbi->s_mmp_tsk);
5236 } else {
5237 /* Make sure we can mount this feature set readwrite */
5238 if (ext4_has_feature_readonly(sb) ||
5239 !ext4_feature_set_ok(sb, 0)) {
5240 err = -EROFS;
5241 goto restore_opts;
5242 }
5243 /*
5244 * Make sure the group descriptor checksums
5245 * are sane. If they aren't, refuse to remount r/w.
5246 */
5247 for (g = 0; g < sbi->s_groups_count; g++) {
5248 struct ext4_group_desc *gdp =
5249 ext4_get_group_desc(sb, g, NULL);
5250
5251 if (!ext4_group_desc_csum_verify(sb, g, gdp)) {
5252 ext4_msg(sb, KERN_ERR,
5253 "ext4_remount: Checksum for group %u failed (%u!=%u)",
5254 g, le16_to_cpu(ext4_group_desc_csum(sb, g, gdp)),
5255 le16_to_cpu(gdp->bg_checksum));
5256 err = -EFSBADCRC;
5257 goto restore_opts;
5258 }
5259 }
5260
5261 /*
5262 * If we have an unprocessed orphan list hanging
5263 * around from a previously readonly bdev mount,
5264 * require a full umount/remount for now.
5265 */
5266 if (es->s_last_orphan) {
5267 ext4_msg(sb, KERN_WARNING, "Couldn't "
5268 "remount RDWR because of unprocessed "
5269 "orphan inode list. Please "
5270 "umount/remount instead");
5271 err = -EINVAL;
5272 goto restore_opts;
5273 }
5274
5275 /*
5276 * Mounting a RDONLY partition read-write, so reread
5277 * and store the current valid flag. (It may have
5278 * been changed by e2fsck since we originally mounted
5279 * the partition.)
5280 */
5281 if (sbi->s_journal)
5282 ext4_clear_journal_err(sb, es);
5283 sbi->s_mount_state = le16_to_cpu(es->s_state);
5284
5285 err = ext4_setup_super(sb, es, 0);
5286 if (err)
5287 goto restore_opts;
5288
5289 sb->s_flags &= ~SB_RDONLY;
5290 if (ext4_has_feature_mmp(sb))
5291 if (ext4_multi_mount_protect(sb,
5292 le64_to_cpu(es->s_mmp_block))) {
5293 err = -EROFS;
5294 goto restore_opts;
5295 }
5296 enable_quota = 1;
5297 }
5298 }
5299
5300 /*
5301 * Reinitialize lazy itable initialization thread based on
5302 * current settings
5303 */
5304 if (sb_rdonly(sb) || !test_opt(sb, INIT_INODE_TABLE))
5305 ext4_unregister_li_request(sb);
5306 else {
5307 ext4_group_t first_not_zeroed;
5308 first_not_zeroed = ext4_has_uninit_itable(sb);
5309 ext4_register_li_request(sb, first_not_zeroed);
5310 }
5311
5312 ext4_setup_system_zone(sb);
5313 if (sbi->s_journal == NULL && !(old_sb_flags & SB_RDONLY)) {
5314 err = ext4_commit_super(sb, 1);
5315 if (err)
5316 goto restore_opts;
5317 }
5318
5319 #ifdef CONFIG_QUOTA
5320 /* Release old quota file names */
5321 for (i = 0; i < EXT4_MAXQUOTAS; i++)
5322 kfree(old_opts.s_qf_names[i]);
5323 if (enable_quota) {
5324 if (sb_any_quota_suspended(sb))
5325 dquot_resume(sb, -1);
5326 else if (ext4_has_feature_quota(sb)) {
5327 err = ext4_enable_quotas(sb);
5328 if (err)
5329 goto restore_opts;
5330 }
5331 }
5332 #endif
5333
5334 *flags = (*flags & ~SB_LAZYTIME) | (sb->s_flags & SB_LAZYTIME);
5335 ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s", orig_data);
5336 kfree(orig_data);
5337 return 0;
5338
5339 restore_opts:
5340 sb->s_flags = old_sb_flags;
5341 sbi->s_mount_opt = old_opts.s_mount_opt;
5342 sbi->s_mount_opt2 = old_opts.s_mount_opt2;
5343 sbi->s_resuid = old_opts.s_resuid;
5344 sbi->s_resgid = old_opts.s_resgid;
5345 sbi->s_commit_interval = old_opts.s_commit_interval;
5346 sbi->s_min_batch_time = old_opts.s_min_batch_time;
5347 sbi->s_max_batch_time = old_opts.s_max_batch_time;
5348 #ifdef CONFIG_QUOTA
5349 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
5350 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
5351 kfree(sbi->s_qf_names[i]);
5352 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
5353 }
5354 #endif
5355 kfree(orig_data);
5356 return err;
5357 }
5358
5359 #ifdef CONFIG_QUOTA
5360 static int ext4_statfs_project(struct super_block *sb,
5361 kprojid_t projid, struct kstatfs *buf)
5362 {
5363 struct kqid qid;
5364 struct dquot *dquot;
5365 u64 limit;
5366 u64 curblock;
5367
5368 qid = make_kqid_projid(projid);
5369 dquot = dqget(sb, qid);
5370 if (IS_ERR(dquot))
5371 return PTR_ERR(dquot);
5372 spin_lock(&dquot->dq_dqb_lock);
5373
5374 limit = (dquot->dq_dqb.dqb_bsoftlimit ?
5375 dquot->dq_dqb.dqb_bsoftlimit :
5376 dquot->dq_dqb.dqb_bhardlimit) >> sb->s_blocksize_bits;
5377 if (limit && buf->f_blocks > limit) {
5378 curblock = (dquot->dq_dqb.dqb_curspace +
5379 dquot->dq_dqb.dqb_rsvspace) >> sb->s_blocksize_bits;
5380 buf->f_blocks = limit;
5381 buf->f_bfree = buf->f_bavail =
5382 (buf->f_blocks > curblock) ?
5383 (buf->f_blocks - curblock) : 0;
5384 }
5385
5386 limit = dquot->dq_dqb.dqb_isoftlimit ?
5387 dquot->dq_dqb.dqb_isoftlimit :
5388 dquot->dq_dqb.dqb_ihardlimit;
5389 if (limit && buf->f_files > limit) {
5390 buf->f_files = limit;
5391 buf->f_ffree =
5392 (buf->f_files > dquot->dq_dqb.dqb_curinodes) ?
5393 (buf->f_files - dquot->dq_dqb.dqb_curinodes) : 0;
5394 }
5395
5396 spin_unlock(&dquot->dq_dqb_lock);
5397 dqput(dquot);
5398 return 0;
5399 }
5400 #endif
5401
5402 static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
5403 {
5404 struct super_block *sb = dentry->d_sb;
5405 struct ext4_sb_info *sbi = EXT4_SB(sb);
5406 struct ext4_super_block *es = sbi->s_es;
5407 ext4_fsblk_t overhead = 0, resv_blocks;
5408 u64 fsid;
5409 s64 bfree;
5410 resv_blocks = EXT4_C2B(sbi, atomic64_read(&sbi->s_resv_clusters));
5411
5412 if (!test_opt(sb, MINIX_DF))
5413 overhead = sbi->s_overhead;
5414
5415 buf->f_type = EXT4_SUPER_MAGIC;
5416 buf->f_bsize = sb->s_blocksize;
5417 buf->f_blocks = ext4_blocks_count(es) - EXT4_C2B(sbi, overhead);
5418 bfree = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) -
5419 percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter);
5420 /* prevent underflow in case that few free space is available */
5421 buf->f_bfree = EXT4_C2B(sbi, max_t(s64, bfree, 0));
5422 buf->f_bavail = buf->f_bfree -
5423 (ext4_r_blocks_count(es) + resv_blocks);
5424 if (buf->f_bfree < (ext4_r_blocks_count(es) + resv_blocks))
5425 buf->f_bavail = 0;
5426 buf->f_files = le32_to_cpu(es->s_inodes_count);
5427 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
5428 buf->f_namelen = EXT4_NAME_LEN;
5429 fsid = le64_to_cpup((void *)es->s_uuid) ^
5430 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
5431 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
5432 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
5433
5434 #ifdef CONFIG_QUOTA
5435 if (ext4_test_inode_flag(dentry->d_inode, EXT4_INODE_PROJINHERIT) &&
5436 sb_has_quota_limits_enabled(sb, PRJQUOTA))
5437 ext4_statfs_project(sb, EXT4_I(dentry->d_inode)->i_projid, buf);
5438 #endif
5439 return 0;
5440 }
5441
5442
5443 #ifdef CONFIG_QUOTA
5444
5445 /*
5446 * Helper functions so that transaction is started before we acquire dqio_sem
5447 * to keep correct lock ordering of transaction > dqio_sem
5448 */
5449 static inline struct inode *dquot_to_inode(struct dquot *dquot)
5450 {
5451 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_id.type];
5452 }
5453
5454 static int ext4_write_dquot(struct dquot *dquot)
5455 {
5456 int ret, err;
5457 handle_t *handle;
5458 struct inode *inode;
5459
5460 inode = dquot_to_inode(dquot);
5461 handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
5462 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
5463 if (IS_ERR(handle))
5464 return PTR_ERR(handle);
5465 ret = dquot_commit(dquot);
5466 err = ext4_journal_stop(handle);
5467 if (!ret)
5468 ret = err;
5469 return ret;
5470 }
5471
5472 static int ext4_acquire_dquot(struct dquot *dquot)
5473 {
5474 int ret, err;
5475 handle_t *handle;
5476
5477 handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
5478 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
5479 if (IS_ERR(handle))
5480 return PTR_ERR(handle);
5481 ret = dquot_acquire(dquot);
5482 err = ext4_journal_stop(handle);
5483 if (!ret)
5484 ret = err;
5485 return ret;
5486 }
5487
5488 static int ext4_release_dquot(struct dquot *dquot)
5489 {
5490 int ret, err;
5491 handle_t *handle;
5492
5493 handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
5494 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
5495 if (IS_ERR(handle)) {
5496 /* Release dquot anyway to avoid endless cycle in dqput() */
5497 dquot_release(dquot);
5498 return PTR_ERR(handle);
5499 }
5500 ret = dquot_release(dquot);
5501 err = ext4_journal_stop(handle);
5502 if (!ret)
5503 ret = err;
5504 return ret;
5505 }
5506
5507 static int ext4_mark_dquot_dirty(struct dquot *dquot)
5508 {
5509 struct super_block *sb = dquot->dq_sb;
5510 struct ext4_sb_info *sbi = EXT4_SB(sb);
5511
5512 /* Are we journaling quotas? */
5513 if (ext4_has_feature_quota(sb) ||
5514 sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
5515 dquot_mark_dquot_dirty(dquot);
5516 return ext4_write_dquot(dquot);
5517 } else {
5518 return dquot_mark_dquot_dirty(dquot);
5519 }
5520 }
5521
5522 static int ext4_write_info(struct super_block *sb, int type)
5523 {
5524 int ret, err;
5525 handle_t *handle;
5526
5527 /* Data block + inode block */
5528 handle = ext4_journal_start(d_inode(sb->s_root), EXT4_HT_QUOTA, 2);
5529 if (IS_ERR(handle))
5530 return PTR_ERR(handle);
5531 ret = dquot_commit_info(sb, type);
5532 err = ext4_journal_stop(handle);
5533 if (!ret)
5534 ret = err;
5535 return ret;
5536 }
5537
5538 /*
5539 * Turn on quotas during mount time - we need to find
5540 * the quota file and such...
5541 */
5542 static int ext4_quota_on_mount(struct super_block *sb, int type)
5543 {
5544 return dquot_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
5545 EXT4_SB(sb)->s_jquota_fmt, type);
5546 }
5547
5548 static void lockdep_set_quota_inode(struct inode *inode, int subclass)
5549 {
5550 struct ext4_inode_info *ei = EXT4_I(inode);
5551
5552 /* The first argument of lockdep_set_subclass has to be
5553 * *exactly* the same as the argument to init_rwsem() --- in
5554 * this case, in init_once() --- or lockdep gets unhappy
5555 * because the name of the lock is set using the
5556 * stringification of the argument to init_rwsem().
5557 */
5558 (void) ei; /* shut up clang warning if !CONFIG_LOCKDEP */
5559 lockdep_set_subclass(&ei->i_data_sem, subclass);
5560 }
5561
5562 /*
5563 * Standard function to be called on quota_on
5564 */
5565 static int ext4_quota_on(struct super_block *sb, int type, int format_id,
5566 const struct path *path)
5567 {
5568 int err;
5569
5570 if (!test_opt(sb, QUOTA))
5571 return -EINVAL;
5572
5573 /* Quotafile not on the same filesystem? */
5574 if (path->dentry->d_sb != sb)
5575 return -EXDEV;
5576 /* Journaling quota? */
5577 if (EXT4_SB(sb)->s_qf_names[type]) {
5578 /* Quotafile not in fs root? */
5579 if (path->dentry->d_parent != sb->s_root)
5580 ext4_msg(sb, KERN_WARNING,
5581 "Quota file not on filesystem root. "
5582 "Journaled quota will not work");
5583 sb_dqopt(sb)->flags |= DQUOT_NOLIST_DIRTY;
5584 } else {
5585 /*
5586 * Clear the flag just in case mount options changed since
5587 * last time.
5588 */
5589 sb_dqopt(sb)->flags &= ~DQUOT_NOLIST_DIRTY;
5590 }
5591
5592 /*
5593 * When we journal data on quota file, we have to flush journal to see
5594 * all updates to the file when we bypass pagecache...
5595 */
5596 if (EXT4_SB(sb)->s_journal &&
5597 ext4_should_journal_data(d_inode(path->dentry))) {
5598 /*
5599 * We don't need to lock updates but journal_flush() could
5600 * otherwise be livelocked...
5601 */
5602 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
5603 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
5604 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
5605 if (err)
5606 return err;
5607 }
5608
5609 lockdep_set_quota_inode(path->dentry->d_inode, I_DATA_SEM_QUOTA);
5610 err = dquot_quota_on(sb, type, format_id, path);
5611 if (err) {
5612 lockdep_set_quota_inode(path->dentry->d_inode,
5613 I_DATA_SEM_NORMAL);
5614 } else {
5615 struct inode *inode = d_inode(path->dentry);
5616 handle_t *handle;
5617
5618 /*
5619 * Set inode flags to prevent userspace from messing with quota
5620 * files. If this fails, we return success anyway since quotas
5621 * are already enabled and this is not a hard failure.
5622 */
5623 inode_lock(inode);
5624 handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1);
5625 if (IS_ERR(handle))
5626 goto unlock_inode;
5627 EXT4_I(inode)->i_flags |= EXT4_NOATIME_FL | EXT4_IMMUTABLE_FL;
5628 inode_set_flags(inode, S_NOATIME | S_IMMUTABLE,
5629 S_NOATIME | S_IMMUTABLE);
5630 ext4_mark_inode_dirty(handle, inode);
5631 ext4_journal_stop(handle);
5632 unlock_inode:
5633 inode_unlock(inode);
5634 }
5635 return err;
5636 }
5637
5638 static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
5639 unsigned int flags)
5640 {
5641 int err;
5642 struct inode *qf_inode;
5643 unsigned long qf_inums[EXT4_MAXQUOTAS] = {
5644 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
5645 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum),
5646 le32_to_cpu(EXT4_SB(sb)->s_es->s_prj_quota_inum)
5647 };
5648
5649 BUG_ON(!ext4_has_feature_quota(sb));
5650
5651 if (!qf_inums[type])
5652 return -EPERM;
5653
5654 qf_inode = ext4_iget(sb, qf_inums[type]);
5655 if (IS_ERR(qf_inode)) {
5656 ext4_error(sb, "Bad quota inode # %lu", qf_inums[type]);
5657 return PTR_ERR(qf_inode);
5658 }
5659
5660 /* Don't account quota for quota files to avoid recursion */
5661 qf_inode->i_flags |= S_NOQUOTA;
5662 lockdep_set_quota_inode(qf_inode, I_DATA_SEM_QUOTA);
5663 err = dquot_enable(qf_inode, type, format_id, flags);
5664 iput(qf_inode);
5665 if (err)
5666 lockdep_set_quota_inode(qf_inode, I_DATA_SEM_NORMAL);
5667
5668 return err;
5669 }
5670
5671 /* Enable usage tracking for all quota types. */
5672 static int ext4_enable_quotas(struct super_block *sb)
5673 {
5674 int type, err = 0;
5675 unsigned long qf_inums[EXT4_MAXQUOTAS] = {
5676 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
5677 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum),
5678 le32_to_cpu(EXT4_SB(sb)->s_es->s_prj_quota_inum)
5679 };
5680 bool quota_mopt[EXT4_MAXQUOTAS] = {
5681 test_opt(sb, USRQUOTA),
5682 test_opt(sb, GRPQUOTA),
5683 test_opt(sb, PRJQUOTA),
5684 };
5685
5686 sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE | DQUOT_NOLIST_DIRTY;
5687 for (type = 0; type < EXT4_MAXQUOTAS; type++) {
5688 if (qf_inums[type]) {
5689 err = ext4_quota_enable(sb, type, QFMT_VFS_V1,
5690 DQUOT_USAGE_ENABLED |
5691 (quota_mopt[type] ? DQUOT_LIMITS_ENABLED : 0));
5692 if (err) {
5693 ext4_warning(sb,
5694 "Failed to enable quota tracking "
5695 "(type=%d, err=%d). Please run "
5696 "e2fsck to fix.", type, err);
5697 for (type--; type >= 0; type--)
5698 dquot_quota_off(sb, type);
5699
5700 return err;
5701 }
5702 }
5703 }
5704 return 0;
5705 }
5706
5707 static int ext4_quota_off(struct super_block *sb, int type)
5708 {
5709 struct inode *inode = sb_dqopt(sb)->files[type];
5710 handle_t *handle;
5711 int err;
5712
5713 /* Force all delayed allocation blocks to be allocated.
5714 * Caller already holds s_umount sem */
5715 if (test_opt(sb, DELALLOC))
5716 sync_filesystem(sb);
5717
5718 if (!inode || !igrab(inode))
5719 goto out;
5720
5721 err = dquot_quota_off(sb, type);
5722 if (err || ext4_has_feature_quota(sb))
5723 goto out_put;
5724
5725 inode_lock(inode);
5726 /*
5727 * Update modification times of quota files when userspace can
5728 * start looking at them. If we fail, we return success anyway since
5729 * this is not a hard failure and quotas are already disabled.
5730 */
5731 handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1);
5732 if (IS_ERR(handle))
5733 goto out_unlock;
5734 EXT4_I(inode)->i_flags &= ~(EXT4_NOATIME_FL | EXT4_IMMUTABLE_FL);
5735 inode_set_flags(inode, 0, S_NOATIME | S_IMMUTABLE);
5736 inode->i_mtime = inode->i_ctime = current_time(inode);
5737 ext4_mark_inode_dirty(handle, inode);
5738 ext4_journal_stop(handle);
5739 out_unlock:
5740 inode_unlock(inode);
5741 out_put:
5742 lockdep_set_quota_inode(inode, I_DATA_SEM_NORMAL);
5743 iput(inode);
5744 return err;
5745 out:
5746 return dquot_quota_off(sb, type);
5747 }
5748
5749 /* Read data from quotafile - avoid pagecache and such because we cannot afford
5750 * acquiring the locks... As quota files are never truncated and quota code
5751 * itself serializes the operations (and no one else should touch the files)
5752 * we don't have to be afraid of races */
5753 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
5754 size_t len, loff_t off)
5755 {
5756 struct inode *inode = sb_dqopt(sb)->files[type];
5757 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
5758 int offset = off & (sb->s_blocksize - 1);
5759 int tocopy;
5760 size_t toread;
5761 struct buffer_head *bh;
5762 loff_t i_size = i_size_read(inode);
5763
5764 if (off > i_size)
5765 return 0;
5766 if (off+len > i_size)
5767 len = i_size-off;
5768 toread = len;
5769 while (toread > 0) {
5770 tocopy = sb->s_blocksize - offset < toread ?
5771 sb->s_blocksize - offset : toread;
5772 bh = ext4_bread(NULL, inode, blk, 0);
5773 if (IS_ERR(bh))
5774 return PTR_ERR(bh);
5775 if (!bh) /* A hole? */
5776 memset(data, 0, tocopy);
5777 else
5778 memcpy(data, bh->b_data+offset, tocopy);
5779 brelse(bh);
5780 offset = 0;
5781 toread -= tocopy;
5782 data += tocopy;
5783 blk++;
5784 }
5785 return len;
5786 }
5787
5788 /* Write to quotafile (we know the transaction is already started and has
5789 * enough credits) */
5790 static ssize_t ext4_quota_write(struct super_block *sb, int type,
5791 const char *data, size_t len, loff_t off)
5792 {
5793 struct inode *inode = sb_dqopt(sb)->files[type];
5794 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
5795 int err, offset = off & (sb->s_blocksize - 1);
5796 int retries = 0;
5797 struct buffer_head *bh;
5798 handle_t *handle = journal_current_handle();
5799
5800 if (EXT4_SB(sb)->s_journal && !handle) {
5801 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
5802 " cancelled because transaction is not started",
5803 (unsigned long long)off, (unsigned long long)len);
5804 return -EIO;
5805 }
5806 /*
5807 * Since we account only one data block in transaction credits,
5808 * then it is impossible to cross a block boundary.
5809 */
5810 if (sb->s_blocksize - offset < len) {
5811 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
5812 " cancelled because not block aligned",
5813 (unsigned long long)off, (unsigned long long)len);
5814 return -EIO;
5815 }
5816
5817 do {
5818 bh = ext4_bread(handle, inode, blk,
5819 EXT4_GET_BLOCKS_CREATE |
5820 EXT4_GET_BLOCKS_METADATA_NOFAIL);
5821 } while (IS_ERR(bh) && (PTR_ERR(bh) == -ENOSPC) &&
5822 ext4_should_retry_alloc(inode->i_sb, &retries));
5823 if (IS_ERR(bh))
5824 return PTR_ERR(bh);
5825 if (!bh)
5826 goto out;
5827 BUFFER_TRACE(bh, "get write access");
5828 err = ext4_journal_get_write_access(handle, bh);
5829 if (err) {
5830 brelse(bh);
5831 return err;
5832 }
5833 lock_buffer(bh);
5834 memcpy(bh->b_data+offset, data, len);
5835 flush_dcache_page(bh->b_page);
5836 unlock_buffer(bh);
5837 err = ext4_handle_dirty_metadata(handle, NULL, bh);
5838 brelse(bh);
5839 out:
5840 if (inode->i_size < off + len) {
5841 i_size_write(inode, off + len);
5842 EXT4_I(inode)->i_disksize = inode->i_size;
5843 ext4_mark_inode_dirty(handle, inode);
5844 }
5845 return len;
5846 }
5847
5848 static int ext4_get_next_id(struct super_block *sb, struct kqid *qid)
5849 {
5850 const struct quota_format_ops *ops;
5851
5852 if (!sb_has_quota_loaded(sb, qid->type))
5853 return -ESRCH;
5854 ops = sb_dqopt(sb)->ops[qid->type];
5855 if (!ops || !ops->get_next_id)
5856 return -ENOSYS;
5857 return dquot_get_next_id(sb, qid);
5858 }
5859 #endif
5860
5861 static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
5862 const char *dev_name, void *data)
5863 {
5864 return mount_bdev(fs_type, flags, dev_name, data, ext4_fill_super);
5865 }
5866
5867 #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2)
5868 static inline void register_as_ext2(void)
5869 {
5870 int err = register_filesystem(&ext2_fs_type);
5871 if (err)
5872 printk(KERN_WARNING
5873 "EXT4-fs: Unable to register as ext2 (%d)\n", err);
5874 }
5875
5876 static inline void unregister_as_ext2(void)
5877 {
5878 unregister_filesystem(&ext2_fs_type);
5879 }
5880
5881 static inline int ext2_feature_set_ok(struct super_block *sb)
5882 {
5883 if (ext4_has_unknown_ext2_incompat_features(sb))
5884 return 0;
5885 if (sb_rdonly(sb))
5886 return 1;
5887 if (ext4_has_unknown_ext2_ro_compat_features(sb))
5888 return 0;
5889 return 1;
5890 }
5891 #else
5892 static inline void register_as_ext2(void) { }
5893 static inline void unregister_as_ext2(void) { }
5894 static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; }
5895 #endif
5896
5897 static inline void register_as_ext3(void)
5898 {
5899 int err = register_filesystem(&ext3_fs_type);
5900 if (err)
5901 printk(KERN_WARNING
5902 "EXT4-fs: Unable to register as ext3 (%d)\n", err);
5903 }
5904
5905 static inline void unregister_as_ext3(void)
5906 {
5907 unregister_filesystem(&ext3_fs_type);
5908 }
5909
5910 static inline int ext3_feature_set_ok(struct super_block *sb)
5911 {
5912 if (ext4_has_unknown_ext3_incompat_features(sb))
5913 return 0;
5914 if (!ext4_has_feature_journal(sb))
5915 return 0;
5916 if (sb_rdonly(sb))
5917 return 1;
5918 if (ext4_has_unknown_ext3_ro_compat_features(sb))
5919 return 0;
5920 return 1;
5921 }
5922
5923 static struct file_system_type ext4_fs_type = {
5924 .owner = THIS_MODULE,
5925 .name = "ext4",
5926 .mount = ext4_mount,
5927 .kill_sb = kill_block_super,
5928 .fs_flags = FS_REQUIRES_DEV,
5929 };
5930 MODULE_ALIAS_FS("ext4");
5931
5932 /* Shared across all ext4 file systems */
5933 wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
5934
5935 static int __init ext4_init_fs(void)
5936 {
5937 int i, err;
5938
5939 ratelimit_state_init(&ext4_mount_msg_ratelimit, 30 * HZ, 64);
5940 ext4_li_info = NULL;
5941 mutex_init(&ext4_li_mtx);
5942
5943 /* Build-time check for flags consistency */
5944 ext4_check_flag_values();
5945
5946 for (i = 0; i < EXT4_WQ_HASH_SZ; i++)
5947 init_waitqueue_head(&ext4__ioend_wq[i]);
5948
5949 err = ext4_init_es();
5950 if (err)
5951 return err;
5952
5953 err = ext4_init_pageio();
5954 if (err)
5955 goto out5;
5956
5957 err = ext4_init_system_zone();
5958 if (err)
5959 goto out4;
5960
5961 err = ext4_init_sysfs();
5962 if (err)
5963 goto out3;
5964
5965 err = ext4_init_mballoc();
5966 if (err)
5967 goto out2;
5968 err = init_inodecache();
5969 if (err)
5970 goto out1;
5971 register_as_ext3();
5972 register_as_ext2();
5973 err = register_filesystem(&ext4_fs_type);
5974 if (err)
5975 goto out;
5976
5977 return 0;
5978 out:
5979 unregister_as_ext2();
5980 unregister_as_ext3();
5981 destroy_inodecache();
5982 out1:
5983 ext4_exit_mballoc();
5984 out2:
5985 ext4_exit_sysfs();
5986 out3:
5987 ext4_exit_system_zone();
5988 out4:
5989 ext4_exit_pageio();
5990 out5:
5991 ext4_exit_es();
5992
5993 return err;
5994 }
5995
5996 static void __exit ext4_exit_fs(void)
5997 {
5998 ext4_destroy_lazyinit_thread();
5999 unregister_as_ext2();
6000 unregister_as_ext3();
6001 unregister_filesystem(&ext4_fs_type);
6002 destroy_inodecache();
6003 ext4_exit_mballoc();
6004 ext4_exit_sysfs();
6005 ext4_exit_system_zone();
6006 ext4_exit_pageio();
6007 ext4_exit_es();
6008 }
6009
6010 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
6011 MODULE_DESCRIPTION("Fourth Extended Filesystem");
6012 MODULE_LICENSE("GPL");
6013 MODULE_SOFTDEP("pre: crc32c");
6014 module_init(ext4_init_fs)
6015 module_exit(ext4_exit_fs)
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