This source file includes following definitions.
- ext4_sb_bread
- ext4_verify_csum_type
- ext4_superblock_csum
- ext4_superblock_csum_verify
- ext4_superblock_csum_set
- ext4_kvmalloc
- ext4_kvzalloc
- ext4_block_bitmap
- ext4_inode_bitmap
- ext4_inode_table
- ext4_free_group_clusters
- ext4_free_inodes_count
- ext4_used_dirs_count
- ext4_itable_unused_count
- ext4_block_bitmap_set
- ext4_inode_bitmap_set
- ext4_inode_table_set
- ext4_free_group_clusters_set
- ext4_free_inodes_set
- ext4_used_dirs_set
- ext4_itable_unused_set
- __ext4_update_tstamp
- __ext4_get_tstamp
- __save_error_info
- save_error_info
- block_device_ejected
- ext4_journal_commit_callback
- system_going_down
- ext4_handle_error
- __ext4_error
- __ext4_error_inode
- __ext4_error_file
- ext4_decode_error
- __ext4_std_error
- __ext4_abort
- __ext4_msg
- __ext4_warning
- __ext4_warning_inode
- __ext4_grp_locked_error
- ext4_mark_group_bitmap_corrupted
- ext4_update_dynamic_rev
- ext4_blkdev_get
- ext4_blkdev_put
- ext4_blkdev_remove
- orphan_list_entry
- dump_orphan_list
- ext4_quota_off_umount
- get_qf_name
- ext4_quota_off_umount
- ext4_put_super
- ext4_alloc_inode
- ext4_drop_inode
- ext4_free_in_core_inode
- ext4_destroy_inode
- init_once
- init_inodecache
- destroy_inodecache
- ext4_clear_inode
- ext4_nfs_get_inode
- ext4_fh_to_dentry
- ext4_fh_to_parent
- ext4_nfs_commit_metadata
- bdev_try_to_free_page
- ext4_get_context
- ext4_set_context
- ext4_dummy_context
- ext4_get_dquots
- get_sb_block
- set_qf_name
- clear_qf_name
- ext4_sb_read_encoding
- handle_mount_opt
- parse_options
- ext4_show_quota_options
- token2str
- _ext4_show_options
- ext4_show_options
- ext4_seq_options_show
- ext4_setup_super
- ext4_alloc_flex_bg_array
- ext4_fill_flex_info
- ext4_group_desc_csum
- ext4_group_desc_csum_verify
- ext4_group_desc_csum_set
- ext4_check_descriptors
- ext4_orphan_cleanup
- ext4_max_size
- ext4_max_bitmap_size
- descriptor_loc
- ext4_get_stripe_size
- ext4_feature_set_ok
- print_daily_error_info
- ext4_run_li_request
- ext4_remove_li_request
- ext4_unregister_li_request
- ext4_lazyinit_thread
- ext4_clear_request_list
- ext4_run_lazyinit_thread
- ext4_has_uninit_itable
- ext4_li_info_new
- ext4_li_request_new
- ext4_register_li_request
- ext4_destroy_lazyinit_thread
- set_journal_csum_feature_set
- count_overhead
- ext4_calculate_overhead
- ext4_set_resv_clusters
- ext4_fill_super
- ext4_init_journal_params
- ext4_get_journal_inode
- ext4_get_journal
- ext4_get_dev_journal
- ext4_load_journal
- ext4_commit_super
- ext4_mark_recovery_complete
- ext4_clear_journal_err
- ext4_force_commit
- ext4_sync_fs
- ext4_freeze
- ext4_unfreeze
- ext4_remount
- ext4_statfs_project
- ext4_statfs
- dquot_to_inode
- ext4_write_dquot
- ext4_acquire_dquot
- ext4_release_dquot
- ext4_mark_dquot_dirty
- ext4_write_info
- ext4_quota_on_mount
- lockdep_set_quota_inode
- ext4_quota_on
- ext4_quota_enable
- ext4_enable_quotas
- ext4_quota_off
- ext4_quota_read
- ext4_quota_write
- ext4_get_next_id
- ext4_mount
- register_as_ext2
- unregister_as_ext2
- ext2_feature_set_ok
- register_as_ext2
- unregister_as_ext2
- ext2_feature_set_ok
- register_as_ext3
- unregister_as_ext3
- ext3_feature_set_ok
- ext4_init_fs
- ext4_exit_fs
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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 #include <linux/unicode.h>
46
47 #include <linux/kthread.h>
48 #include <linux/freezer.h>
49
50 #include "ext4.h"
51 #include "ext4_extents.h"
52 #include "ext4_jbd2.h"
53 #include "xattr.h"
54 #include "acl.h"
55 #include "mballoc.h"
56 #include "fsmap.h"
57
58 #define CREATE_TRACE_POINTS
59 #include <trace/events/ext4.h>
60
61 static struct ext4_lazy_init *ext4_li_info;
62 static struct mutex ext4_li_mtx;
63 static struct ratelimit_state ext4_mount_msg_ratelimit;
64
65 static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
66 unsigned long journal_devnum);
67 static int ext4_show_options(struct seq_file *seq, struct dentry *root);
68 static int ext4_commit_super(struct super_block *sb, int sync);
69 static void ext4_mark_recovery_complete(struct super_block *sb,
70 struct ext4_super_block *es);
71 static void ext4_clear_journal_err(struct super_block *sb,
72 struct ext4_super_block *es);
73 static int ext4_sync_fs(struct super_block *sb, int wait);
74 static int ext4_remount(struct super_block *sb, int *flags, char *data);
75 static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
76 static int ext4_unfreeze(struct super_block *sb);
77 static int ext4_freeze(struct super_block *sb);
78 static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
79 const char *dev_name, void *data);
80 static inline int ext2_feature_set_ok(struct super_block *sb);
81 static inline int ext3_feature_set_ok(struct super_block *sb);
82 static int ext4_feature_set_ok(struct super_block *sb, int readonly);
83 static void ext4_destroy_lazyinit_thread(void);
84 static void ext4_unregister_li_request(struct super_block *sb);
85 static void ext4_clear_request_list(void);
86 static struct inode *ext4_get_journal_inode(struct super_block *sb,
87 unsigned int journal_inum);
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117 #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2)
118 static struct file_system_type ext2_fs_type = {
119 .owner = THIS_MODULE,
120 .name = "ext2",
121 .mount = ext4_mount,
122 .kill_sb = kill_block_super,
123 .fs_flags = FS_REQUIRES_DEV,
124 };
125 MODULE_ALIAS_FS("ext2");
126 MODULE_ALIAS("ext2");
127 #define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type)
128 #else
129 #define IS_EXT2_SB(sb) (0)
130 #endif
131
132
133 static struct file_system_type ext3_fs_type = {
134 .owner = THIS_MODULE,
135 .name = "ext3",
136 .mount = ext4_mount,
137 .kill_sb = kill_block_super,
138 .fs_flags = FS_REQUIRES_DEV,
139 };
140 MODULE_ALIAS_FS("ext3");
141 MODULE_ALIAS("ext3");
142 #define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type)
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149
150 struct buffer_head *
151 ext4_sb_bread(struct super_block *sb, sector_t block, int op_flags)
152 {
153 struct buffer_head *bh = sb_getblk(sb, block);
154
155 if (bh == NULL)
156 return ERR_PTR(-ENOMEM);
157 if (buffer_uptodate(bh))
158 return bh;
159 ll_rw_block(REQ_OP_READ, REQ_META | op_flags, 1, &bh);
160 wait_on_buffer(bh);
161 if (buffer_uptodate(bh))
162 return bh;
163 put_bh(bh);
164 return ERR_PTR(-EIO);
165 }
166
167 static int ext4_verify_csum_type(struct super_block *sb,
168 struct ext4_super_block *es)
169 {
170 if (!ext4_has_feature_metadata_csum(sb))
171 return 1;
172
173 return es->s_checksum_type == EXT4_CRC32C_CHKSUM;
174 }
175
176 static __le32 ext4_superblock_csum(struct super_block *sb,
177 struct ext4_super_block *es)
178 {
179 struct ext4_sb_info *sbi = EXT4_SB(sb);
180 int offset = offsetof(struct ext4_super_block, s_checksum);
181 __u32 csum;
182
183 csum = ext4_chksum(sbi, ~0, (char *)es, offset);
184
185 return cpu_to_le32(csum);
186 }
187
188 static int ext4_superblock_csum_verify(struct super_block *sb,
189 struct ext4_super_block *es)
190 {
191 if (!ext4_has_metadata_csum(sb))
192 return 1;
193
194 return es->s_checksum == ext4_superblock_csum(sb, es);
195 }
196
197 void ext4_superblock_csum_set(struct super_block *sb)
198 {
199 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
200
201 if (!ext4_has_metadata_csum(sb))
202 return;
203
204 es->s_checksum = ext4_superblock_csum(sb, es);
205 }
206
207 void *ext4_kvmalloc(size_t size, gfp_t flags)
208 {
209 void *ret;
210
211 ret = kmalloc(size, flags | __GFP_NOWARN);
212 if (!ret)
213 ret = __vmalloc(size, flags, PAGE_KERNEL);
214 return ret;
215 }
216
217 void *ext4_kvzalloc(size_t size, gfp_t flags)
218 {
219 void *ret;
220
221 ret = kzalloc(size, flags | __GFP_NOWARN);
222 if (!ret)
223 ret = __vmalloc(size, flags | __GFP_ZERO, PAGE_KERNEL);
224 return ret;
225 }
226
227 ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
228 struct ext4_group_desc *bg)
229 {
230 return le32_to_cpu(bg->bg_block_bitmap_lo) |
231 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
232 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
233 }
234
235 ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
236 struct ext4_group_desc *bg)
237 {
238 return le32_to_cpu(bg->bg_inode_bitmap_lo) |
239 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
240 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
241 }
242
243 ext4_fsblk_t ext4_inode_table(struct super_block *sb,
244 struct ext4_group_desc *bg)
245 {
246 return le32_to_cpu(bg->bg_inode_table_lo) |
247 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
248 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
249 }
250
251 __u32 ext4_free_group_clusters(struct super_block *sb,
252 struct ext4_group_desc *bg)
253 {
254 return le16_to_cpu(bg->bg_free_blocks_count_lo) |
255 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
256 (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0);
257 }
258
259 __u32 ext4_free_inodes_count(struct super_block *sb,
260 struct ext4_group_desc *bg)
261 {
262 return le16_to_cpu(bg->bg_free_inodes_count_lo) |
263 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
264 (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0);
265 }
266
267 __u32 ext4_used_dirs_count(struct super_block *sb,
268 struct ext4_group_desc *bg)
269 {
270 return le16_to_cpu(bg->bg_used_dirs_count_lo) |
271 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
272 (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0);
273 }
274
275 __u32 ext4_itable_unused_count(struct super_block *sb,
276 struct ext4_group_desc *bg)
277 {
278 return le16_to_cpu(bg->bg_itable_unused_lo) |
279 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
280 (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0);
281 }
282
283 void ext4_block_bitmap_set(struct super_block *sb,
284 struct ext4_group_desc *bg, ext4_fsblk_t blk)
285 {
286 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
287 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
288 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
289 }
290
291 void ext4_inode_bitmap_set(struct super_block *sb,
292 struct ext4_group_desc *bg, ext4_fsblk_t blk)
293 {
294 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk);
295 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
296 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
297 }
298
299 void ext4_inode_table_set(struct super_block *sb,
300 struct ext4_group_desc *bg, ext4_fsblk_t blk)
301 {
302 bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
303 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
304 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
305 }
306
307 void ext4_free_group_clusters_set(struct super_block *sb,
308 struct ext4_group_desc *bg, __u32 count)
309 {
310 bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count);
311 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
312 bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16);
313 }
314
315 void ext4_free_inodes_set(struct super_block *sb,
316 struct ext4_group_desc *bg, __u32 count)
317 {
318 bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count);
319 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
320 bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16);
321 }
322
323 void ext4_used_dirs_set(struct super_block *sb,
324 struct ext4_group_desc *bg, __u32 count)
325 {
326 bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count);
327 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
328 bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16);
329 }
330
331 void ext4_itable_unused_set(struct super_block *sb,
332 struct ext4_group_desc *bg, __u32 count)
333 {
334 bg->bg_itable_unused_lo = cpu_to_le16((__u16)count);
335 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
336 bg->bg_itable_unused_hi = cpu_to_le16(count >> 16);
337 }
338
339 static void __ext4_update_tstamp(__le32 *lo, __u8 *hi)
340 {
341 time64_t now = ktime_get_real_seconds();
342
343 now = clamp_val(now, 0, (1ull << 40) - 1);
344
345 *lo = cpu_to_le32(lower_32_bits(now));
346 *hi = upper_32_bits(now);
347 }
348
349 static time64_t __ext4_get_tstamp(__le32 *lo, __u8 *hi)
350 {
351 return ((time64_t)(*hi) << 32) + le32_to_cpu(*lo);
352 }
353 #define ext4_update_tstamp(es, tstamp) \
354 __ext4_update_tstamp(&(es)->tstamp, &(es)->tstamp ## _hi)
355 #define ext4_get_tstamp(es, tstamp) \
356 __ext4_get_tstamp(&(es)->tstamp, &(es)->tstamp ## _hi)
357
358 static void __save_error_info(struct super_block *sb, const char *func,
359 unsigned int line)
360 {
361 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
362
363 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
364 if (bdev_read_only(sb->s_bdev))
365 return;
366 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
367 ext4_update_tstamp(es, s_last_error_time);
368 strncpy(es->s_last_error_func, func, sizeof(es->s_last_error_func));
369 es->s_last_error_line = cpu_to_le32(line);
370 if (!es->s_first_error_time) {
371 es->s_first_error_time = es->s_last_error_time;
372 es->s_first_error_time_hi = es->s_last_error_time_hi;
373 strncpy(es->s_first_error_func, func,
374 sizeof(es->s_first_error_func));
375 es->s_first_error_line = cpu_to_le32(line);
376 es->s_first_error_ino = es->s_last_error_ino;
377 es->s_first_error_block = es->s_last_error_block;
378 }
379
380
381
382
383 if (!es->s_error_count)
384 mod_timer(&EXT4_SB(sb)->s_err_report, jiffies + 24*60*60*HZ);
385 le32_add_cpu(&es->s_error_count, 1);
386 }
387
388 static void save_error_info(struct super_block *sb, const char *func,
389 unsigned int line)
390 {
391 __save_error_info(sb, func, line);
392 if (!bdev_read_only(sb->s_bdev))
393 ext4_commit_super(sb, 1);
394 }
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403
404 static int block_device_ejected(struct super_block *sb)
405 {
406 struct inode *bd_inode = sb->s_bdev->bd_inode;
407 struct backing_dev_info *bdi = inode_to_bdi(bd_inode);
408
409 return bdi->dev == NULL;
410 }
411
412 static void ext4_journal_commit_callback(journal_t *journal, transaction_t *txn)
413 {
414 struct super_block *sb = journal->j_private;
415 struct ext4_sb_info *sbi = EXT4_SB(sb);
416 int error = is_journal_aborted(journal);
417 struct ext4_journal_cb_entry *jce;
418
419 BUG_ON(txn->t_state == T_FINISHED);
420
421 ext4_process_freed_data(sb, txn->t_tid);
422
423 spin_lock(&sbi->s_md_lock);
424 while (!list_empty(&txn->t_private_list)) {
425 jce = list_entry(txn->t_private_list.next,
426 struct ext4_journal_cb_entry, jce_list);
427 list_del_init(&jce->jce_list);
428 spin_unlock(&sbi->s_md_lock);
429 jce->jce_func(sb, jce, error);
430 spin_lock(&sbi->s_md_lock);
431 }
432 spin_unlock(&sbi->s_md_lock);
433 }
434
435 static bool system_going_down(void)
436 {
437 return system_state == SYSTEM_HALT || system_state == SYSTEM_POWER_OFF
438 || system_state == SYSTEM_RESTART;
439 }
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456 static void ext4_handle_error(struct super_block *sb)
457 {
458 if (test_opt(sb, WARN_ON_ERROR))
459 WARN_ON_ONCE(1);
460
461 if (sb_rdonly(sb))
462 return;
463
464 if (!test_opt(sb, ERRORS_CONT)) {
465 journal_t *journal = EXT4_SB(sb)->s_journal;
466
467 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
468 if (journal)
469 jbd2_journal_abort(journal, -EIO);
470 }
471
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474
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476 if (test_opt(sb, ERRORS_RO) || system_going_down()) {
477 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
478
479
480
481
482 smp_wmb();
483 sb->s_flags |= SB_RDONLY;
484 } else if (test_opt(sb, ERRORS_PANIC)) {
485 if (EXT4_SB(sb)->s_journal &&
486 !(EXT4_SB(sb)->s_journal->j_flags & JBD2_REC_ERR))
487 return;
488 panic("EXT4-fs (device %s): panic forced after error\n",
489 sb->s_id);
490 }
491 }
492
493 #define ext4_error_ratelimit(sb) \
494 ___ratelimit(&(EXT4_SB(sb)->s_err_ratelimit_state), \
495 "EXT4-fs error")
496
497 void __ext4_error(struct super_block *sb, const char *function,
498 unsigned int line, const char *fmt, ...)
499 {
500 struct va_format vaf;
501 va_list args;
502
503 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
504 return;
505
506 trace_ext4_error(sb, function, line);
507 if (ext4_error_ratelimit(sb)) {
508 va_start(args, fmt);
509 vaf.fmt = fmt;
510 vaf.va = &args;
511 printk(KERN_CRIT
512 "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n",
513 sb->s_id, function, line, current->comm, &vaf);
514 va_end(args);
515 }
516 save_error_info(sb, function, line);
517 ext4_handle_error(sb);
518 }
519
520 void __ext4_error_inode(struct inode *inode, const char *function,
521 unsigned int line, ext4_fsblk_t block,
522 const char *fmt, ...)
523 {
524 va_list args;
525 struct va_format vaf;
526 struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
527
528 if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
529 return;
530
531 trace_ext4_error(inode->i_sb, function, line);
532 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
533 es->s_last_error_block = cpu_to_le64(block);
534 if (ext4_error_ratelimit(inode->i_sb)) {
535 va_start(args, fmt);
536 vaf.fmt = fmt;
537 vaf.va = &args;
538 if (block)
539 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
540 "inode #%lu: block %llu: comm %s: %pV\n",
541 inode->i_sb->s_id, function, line, inode->i_ino,
542 block, current->comm, &vaf);
543 else
544 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
545 "inode #%lu: comm %s: %pV\n",
546 inode->i_sb->s_id, function, line, inode->i_ino,
547 current->comm, &vaf);
548 va_end(args);
549 }
550 save_error_info(inode->i_sb, function, line);
551 ext4_handle_error(inode->i_sb);
552 }
553
554 void __ext4_error_file(struct file *file, const char *function,
555 unsigned int line, ext4_fsblk_t block,
556 const char *fmt, ...)
557 {
558 va_list args;
559 struct va_format vaf;
560 struct ext4_super_block *es;
561 struct inode *inode = file_inode(file);
562 char pathname[80], *path;
563
564 if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
565 return;
566
567 trace_ext4_error(inode->i_sb, function, line);
568 es = EXT4_SB(inode->i_sb)->s_es;
569 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
570 if (ext4_error_ratelimit(inode->i_sb)) {
571 path = file_path(file, pathname, sizeof(pathname));
572 if (IS_ERR(path))
573 path = "(unknown)";
574 va_start(args, fmt);
575 vaf.fmt = fmt;
576 vaf.va = &args;
577 if (block)
578 printk(KERN_CRIT
579 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
580 "block %llu: comm %s: path %s: %pV\n",
581 inode->i_sb->s_id, function, line, inode->i_ino,
582 block, current->comm, path, &vaf);
583 else
584 printk(KERN_CRIT
585 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
586 "comm %s: path %s: %pV\n",
587 inode->i_sb->s_id, function, line, inode->i_ino,
588 current->comm, path, &vaf);
589 va_end(args);
590 }
591 save_error_info(inode->i_sb, function, line);
592 ext4_handle_error(inode->i_sb);
593 }
594
595 const char *ext4_decode_error(struct super_block *sb, int errno,
596 char nbuf[16])
597 {
598 char *errstr = NULL;
599
600 switch (errno) {
601 case -EFSCORRUPTED:
602 errstr = "Corrupt filesystem";
603 break;
604 case -EFSBADCRC:
605 errstr = "Filesystem failed CRC";
606 break;
607 case -EIO:
608 errstr = "IO failure";
609 break;
610 case -ENOMEM:
611 errstr = "Out of memory";
612 break;
613 case -EROFS:
614 if (!sb || (EXT4_SB(sb)->s_journal &&
615 EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT))
616 errstr = "Journal has aborted";
617 else
618 errstr = "Readonly filesystem";
619 break;
620 default:
621
622
623
624 if (nbuf) {
625
626 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
627 errstr = nbuf;
628 }
629 break;
630 }
631
632 return errstr;
633 }
634
635
636
637
638 void __ext4_std_error(struct super_block *sb, const char *function,
639 unsigned int line, int errno)
640 {
641 char nbuf[16];
642 const char *errstr;
643
644 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
645 return;
646
647
648
649
650 if (errno == -EROFS && journal_current_handle() == NULL && sb_rdonly(sb))
651 return;
652
653 if (ext4_error_ratelimit(sb)) {
654 errstr = ext4_decode_error(sb, errno, nbuf);
655 printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n",
656 sb->s_id, function, line, errstr);
657 }
658
659 save_error_info(sb, function, line);
660 ext4_handle_error(sb);
661 }
662
663
664
665
666
667
668
669
670
671
672
673 void __ext4_abort(struct super_block *sb, const char *function,
674 unsigned int line, const char *fmt, ...)
675 {
676 struct va_format vaf;
677 va_list args;
678
679 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
680 return;
681
682 save_error_info(sb, function, line);
683 va_start(args, fmt);
684 vaf.fmt = fmt;
685 vaf.va = &args;
686 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: %pV\n",
687 sb->s_id, function, line, &vaf);
688 va_end(args);
689
690 if (sb_rdonly(sb) == 0) {
691 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
692 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
693
694
695
696
697 smp_wmb();
698 sb->s_flags |= SB_RDONLY;
699 if (EXT4_SB(sb)->s_journal)
700 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
701 save_error_info(sb, function, line);
702 }
703 if (test_opt(sb, ERRORS_PANIC) && !system_going_down()) {
704 if (EXT4_SB(sb)->s_journal &&
705 !(EXT4_SB(sb)->s_journal->j_flags & JBD2_REC_ERR))
706 return;
707 panic("EXT4-fs panic from previous error\n");
708 }
709 }
710
711 void __ext4_msg(struct super_block *sb,
712 const char *prefix, const char *fmt, ...)
713 {
714 struct va_format vaf;
715 va_list args;
716
717 if (!___ratelimit(&(EXT4_SB(sb)->s_msg_ratelimit_state), "EXT4-fs"))
718 return;
719
720 va_start(args, fmt);
721 vaf.fmt = fmt;
722 vaf.va = &args;
723 printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
724 va_end(args);
725 }
726
727 #define ext4_warning_ratelimit(sb) \
728 ___ratelimit(&(EXT4_SB(sb)->s_warning_ratelimit_state), \
729 "EXT4-fs warning")
730
731 void __ext4_warning(struct super_block *sb, const char *function,
732 unsigned int line, const char *fmt, ...)
733 {
734 struct va_format vaf;
735 va_list args;
736
737 if (!ext4_warning_ratelimit(sb))
738 return;
739
740 va_start(args, fmt);
741 vaf.fmt = fmt;
742 vaf.va = &args;
743 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: %pV\n",
744 sb->s_id, function, line, &vaf);
745 va_end(args);
746 }
747
748 void __ext4_warning_inode(const struct inode *inode, const char *function,
749 unsigned int line, const char *fmt, ...)
750 {
751 struct va_format vaf;
752 va_list args;
753
754 if (!ext4_warning_ratelimit(inode->i_sb))
755 return;
756
757 va_start(args, fmt);
758 vaf.fmt = fmt;
759 vaf.va = &args;
760 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: "
761 "inode #%lu: comm %s: %pV\n", inode->i_sb->s_id,
762 function, line, inode->i_ino, current->comm, &vaf);
763 va_end(args);
764 }
765
766 void __ext4_grp_locked_error(const char *function, unsigned int line,
767 struct super_block *sb, ext4_group_t grp,
768 unsigned long ino, ext4_fsblk_t block,
769 const char *fmt, ...)
770 __releases(bitlock)
771 __acquires(bitlock)
772 {
773 struct va_format vaf;
774 va_list args;
775 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
776
777 if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
778 return;
779
780 trace_ext4_error(sb, function, line);
781 es->s_last_error_ino = cpu_to_le32(ino);
782 es->s_last_error_block = cpu_to_le64(block);
783 __save_error_info(sb, function, line);
784
785 if (ext4_error_ratelimit(sb)) {
786 va_start(args, fmt);
787 vaf.fmt = fmt;
788 vaf.va = &args;
789 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u, ",
790 sb->s_id, function, line, grp);
791 if (ino)
792 printk(KERN_CONT "inode %lu: ", ino);
793 if (block)
794 printk(KERN_CONT "block %llu:",
795 (unsigned long long) block);
796 printk(KERN_CONT "%pV\n", &vaf);
797 va_end(args);
798 }
799
800 if (test_opt(sb, WARN_ON_ERROR))
801 WARN_ON_ONCE(1);
802
803 if (test_opt(sb, ERRORS_CONT)) {
804 ext4_commit_super(sb, 0);
805 return;
806 }
807
808 ext4_unlock_group(sb, grp);
809 ext4_commit_super(sb, 1);
810 ext4_handle_error(sb);
811
812
813
814
815
816
817
818
819
820
821
822 ext4_lock_group(sb, grp);
823 return;
824 }
825
826 void ext4_mark_group_bitmap_corrupted(struct super_block *sb,
827 ext4_group_t group,
828 unsigned int flags)
829 {
830 struct ext4_sb_info *sbi = EXT4_SB(sb);
831 struct ext4_group_info *grp = ext4_get_group_info(sb, group);
832 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, group, NULL);
833 int ret;
834
835 if (flags & EXT4_GROUP_INFO_BBITMAP_CORRUPT) {
836 ret = ext4_test_and_set_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT,
837 &grp->bb_state);
838 if (!ret)
839 percpu_counter_sub(&sbi->s_freeclusters_counter,
840 grp->bb_free);
841 }
842
843 if (flags & EXT4_GROUP_INFO_IBITMAP_CORRUPT) {
844 ret = ext4_test_and_set_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT,
845 &grp->bb_state);
846 if (!ret && gdp) {
847 int count;
848
849 count = ext4_free_inodes_count(sb, gdp);
850 percpu_counter_sub(&sbi->s_freeinodes_counter,
851 count);
852 }
853 }
854 }
855
856 void ext4_update_dynamic_rev(struct super_block *sb)
857 {
858 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
859
860 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
861 return;
862
863 ext4_warning(sb,
864 "updating to rev %d because of new feature flag, "
865 "running e2fsck is recommended",
866 EXT4_DYNAMIC_REV);
867
868 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
869 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
870 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
871
872
873
874
875
876
877
878
879 }
880
881
882
883
884 static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb)
885 {
886 struct block_device *bdev;
887 char b[BDEVNAME_SIZE];
888
889 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
890 if (IS_ERR(bdev))
891 goto fail;
892 return bdev;
893
894 fail:
895 ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld",
896 __bdevname(dev, b), PTR_ERR(bdev));
897 return NULL;
898 }
899
900
901
902
903 static void ext4_blkdev_put(struct block_device *bdev)
904 {
905 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
906 }
907
908 static void ext4_blkdev_remove(struct ext4_sb_info *sbi)
909 {
910 struct block_device *bdev;
911 bdev = sbi->journal_bdev;
912 if (bdev) {
913 ext4_blkdev_put(bdev);
914 sbi->journal_bdev = NULL;
915 }
916 }
917
918 static inline struct inode *orphan_list_entry(struct list_head *l)
919 {
920 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
921 }
922
923 static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
924 {
925 struct list_head *l;
926
927 ext4_msg(sb, KERN_ERR, "sb orphan head is %d",
928 le32_to_cpu(sbi->s_es->s_last_orphan));
929
930 printk(KERN_ERR "sb_info orphan list:\n");
931 list_for_each(l, &sbi->s_orphan) {
932 struct inode *inode = orphan_list_entry(l);
933 printk(KERN_ERR " "
934 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
935 inode->i_sb->s_id, inode->i_ino, inode,
936 inode->i_mode, inode->i_nlink,
937 NEXT_ORPHAN(inode));
938 }
939 }
940
941 #ifdef CONFIG_QUOTA
942 static int ext4_quota_off(struct super_block *sb, int type);
943
944 static inline void ext4_quota_off_umount(struct super_block *sb)
945 {
946 int type;
947
948
949 for (type = 0; type < EXT4_MAXQUOTAS; type++)
950 ext4_quota_off(sb, type);
951 }
952
953
954
955
956
957 static inline char *get_qf_name(struct super_block *sb,
958 struct ext4_sb_info *sbi,
959 int type)
960 {
961 return rcu_dereference_protected(sbi->s_qf_names[type],
962 lockdep_is_held(&sb->s_umount));
963 }
964 #else
965 static inline void ext4_quota_off_umount(struct super_block *sb)
966 {
967 }
968 #endif
969
970 static void ext4_put_super(struct super_block *sb)
971 {
972 struct ext4_sb_info *sbi = EXT4_SB(sb);
973 struct ext4_super_block *es = sbi->s_es;
974 struct buffer_head **group_desc;
975 struct flex_groups **flex_groups;
976 int aborted = 0;
977 int i, err;
978
979 ext4_unregister_li_request(sb);
980 ext4_quota_off_umount(sb);
981
982 destroy_workqueue(sbi->rsv_conversion_wq);
983
984 if (sbi->s_journal) {
985 aborted = is_journal_aborted(sbi->s_journal);
986 err = jbd2_journal_destroy(sbi->s_journal);
987 sbi->s_journal = NULL;
988 if ((err < 0) && !aborted)
989 ext4_abort(sb, "Couldn't clean up the journal");
990 }
991
992 ext4_unregister_sysfs(sb);
993 ext4_es_unregister_shrinker(sbi);
994 del_timer_sync(&sbi->s_err_report);
995 ext4_release_system_zone(sb);
996 ext4_mb_release(sb);
997 ext4_ext_release(sb);
998
999 if (!sb_rdonly(sb) && !aborted) {
1000 ext4_clear_feature_journal_needs_recovery(sb);
1001 es->s_state = cpu_to_le16(sbi->s_mount_state);
1002 }
1003 if (!sb_rdonly(sb))
1004 ext4_commit_super(sb, 1);
1005
1006 rcu_read_lock();
1007 group_desc = rcu_dereference(sbi->s_group_desc);
1008 for (i = 0; i < sbi->s_gdb_count; i++)
1009 brelse(group_desc[i]);
1010 kvfree(group_desc);
1011 flex_groups = rcu_dereference(sbi->s_flex_groups);
1012 if (flex_groups) {
1013 for (i = 0; i < sbi->s_flex_groups_allocated; i++)
1014 kvfree(flex_groups[i]);
1015 kvfree(flex_groups);
1016 }
1017 rcu_read_unlock();
1018 percpu_counter_destroy(&sbi->s_freeclusters_counter);
1019 percpu_counter_destroy(&sbi->s_freeinodes_counter);
1020 percpu_counter_destroy(&sbi->s_dirs_counter);
1021 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
1022 percpu_free_rwsem(&sbi->s_writepages_rwsem);
1023 #ifdef CONFIG_QUOTA
1024 for (i = 0; i < EXT4_MAXQUOTAS; i++)
1025 kfree(get_qf_name(sb, sbi, i));
1026 #endif
1027
1028
1029
1030
1031
1032 if (!list_empty(&sbi->s_orphan))
1033 dump_orphan_list(sb, sbi);
1034 J_ASSERT(list_empty(&sbi->s_orphan));
1035
1036 sync_blockdev(sb->s_bdev);
1037 invalidate_bdev(sb->s_bdev);
1038 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
1039
1040
1041
1042
1043
1044 sync_blockdev(sbi->journal_bdev);
1045 invalidate_bdev(sbi->journal_bdev);
1046 ext4_blkdev_remove(sbi);
1047 }
1048
1049 ext4_xattr_destroy_cache(sbi->s_ea_inode_cache);
1050 sbi->s_ea_inode_cache = NULL;
1051
1052 ext4_xattr_destroy_cache(sbi->s_ea_block_cache);
1053 sbi->s_ea_block_cache = NULL;
1054
1055 if (sbi->s_mmp_tsk)
1056 kthread_stop(sbi->s_mmp_tsk);
1057 brelse(sbi->s_sbh);
1058 sb->s_fs_info = NULL;
1059
1060
1061
1062
1063 kobject_put(&sbi->s_kobj);
1064 wait_for_completion(&sbi->s_kobj_unregister);
1065 if (sbi->s_chksum_driver)
1066 crypto_free_shash(sbi->s_chksum_driver);
1067 kfree(sbi->s_blockgroup_lock);
1068 fs_put_dax(sbi->s_daxdev);
1069 #ifdef CONFIG_UNICODE
1070 utf8_unload(sbi->s_encoding);
1071 #endif
1072 kfree(sbi);
1073 }
1074
1075 static struct kmem_cache *ext4_inode_cachep;
1076
1077
1078
1079
1080 static struct inode *ext4_alloc_inode(struct super_block *sb)
1081 {
1082 struct ext4_inode_info *ei;
1083
1084 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
1085 if (!ei)
1086 return NULL;
1087
1088 inode_set_iversion(&ei->vfs_inode, 1);
1089 spin_lock_init(&ei->i_raw_lock);
1090 INIT_LIST_HEAD(&ei->i_prealloc_list);
1091 spin_lock_init(&ei->i_prealloc_lock);
1092 ext4_es_init_tree(&ei->i_es_tree);
1093 rwlock_init(&ei->i_es_lock);
1094 INIT_LIST_HEAD(&ei->i_es_list);
1095 ei->i_es_all_nr = 0;
1096 ei->i_es_shk_nr = 0;
1097 ei->i_es_shrink_lblk = 0;
1098 ei->i_reserved_data_blocks = 0;
1099 ei->i_da_metadata_calc_len = 0;
1100 ei->i_da_metadata_calc_last_lblock = 0;
1101 spin_lock_init(&(ei->i_block_reservation_lock));
1102 ext4_init_pending_tree(&ei->i_pending_tree);
1103 #ifdef CONFIG_QUOTA
1104 ei->i_reserved_quota = 0;
1105 memset(&ei->i_dquot, 0, sizeof(ei->i_dquot));
1106 #endif
1107 ei->jinode = NULL;
1108 INIT_LIST_HEAD(&ei->i_rsv_conversion_list);
1109 spin_lock_init(&ei->i_completed_io_lock);
1110 ei->i_sync_tid = 0;
1111 ei->i_datasync_tid = 0;
1112 atomic_set(&ei->i_unwritten, 0);
1113 INIT_WORK(&ei->i_rsv_conversion_work, ext4_end_io_rsv_work);
1114 return &ei->vfs_inode;
1115 }
1116
1117 static int ext4_drop_inode(struct inode *inode)
1118 {
1119 int drop = generic_drop_inode(inode);
1120
1121 if (!drop)
1122 drop = fscrypt_drop_inode(inode);
1123
1124 trace_ext4_drop_inode(inode, drop);
1125 return drop;
1126 }
1127
1128 static void ext4_free_in_core_inode(struct inode *inode)
1129 {
1130 fscrypt_free_inode(inode);
1131 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
1132 }
1133
1134 static void ext4_destroy_inode(struct inode *inode)
1135 {
1136 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
1137 ext4_msg(inode->i_sb, KERN_ERR,
1138 "Inode %lu (%p): orphan list check failed!",
1139 inode->i_ino, EXT4_I(inode));
1140 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
1141 EXT4_I(inode), sizeof(struct ext4_inode_info),
1142 true);
1143 dump_stack();
1144 }
1145 }
1146
1147 static void init_once(void *foo)
1148 {
1149 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
1150
1151 INIT_LIST_HEAD(&ei->i_orphan);
1152 init_rwsem(&ei->xattr_sem);
1153 init_rwsem(&ei->i_data_sem);
1154 init_rwsem(&ei->i_mmap_sem);
1155 inode_init_once(&ei->vfs_inode);
1156 }
1157
1158 static int __init init_inodecache(void)
1159 {
1160 ext4_inode_cachep = kmem_cache_create_usercopy("ext4_inode_cache",
1161 sizeof(struct ext4_inode_info), 0,
1162 (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|
1163 SLAB_ACCOUNT),
1164 offsetof(struct ext4_inode_info, i_data),
1165 sizeof_field(struct ext4_inode_info, i_data),
1166 init_once);
1167 if (ext4_inode_cachep == NULL)
1168 return -ENOMEM;
1169 return 0;
1170 }
1171
1172 static void destroy_inodecache(void)
1173 {
1174
1175
1176
1177
1178 rcu_barrier();
1179 kmem_cache_destroy(ext4_inode_cachep);
1180 }
1181
1182 void ext4_clear_inode(struct inode *inode)
1183 {
1184 invalidate_inode_buffers(inode);
1185 clear_inode(inode);
1186 ext4_discard_preallocations(inode);
1187 ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS);
1188 dquot_drop(inode);
1189 if (EXT4_I(inode)->jinode) {
1190 jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode),
1191 EXT4_I(inode)->jinode);
1192 jbd2_free_inode(EXT4_I(inode)->jinode);
1193 EXT4_I(inode)->jinode = NULL;
1194 }
1195 fscrypt_put_encryption_info(inode);
1196 fsverity_cleanup_inode(inode);
1197 }
1198
1199 static struct inode *ext4_nfs_get_inode(struct super_block *sb,
1200 u64 ino, u32 generation)
1201 {
1202 struct inode *inode;
1203
1204
1205
1206
1207
1208 inode = ext4_iget(sb, ino, EXT4_IGET_HANDLE);
1209 if (IS_ERR(inode))
1210 return ERR_CAST(inode);
1211 if (generation && inode->i_generation != generation) {
1212 iput(inode);
1213 return ERR_PTR(-ESTALE);
1214 }
1215
1216 return inode;
1217 }
1218
1219 static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
1220 int fh_len, int fh_type)
1221 {
1222 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
1223 ext4_nfs_get_inode);
1224 }
1225
1226 static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
1227 int fh_len, int fh_type)
1228 {
1229 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
1230 ext4_nfs_get_inode);
1231 }
1232
1233 static int ext4_nfs_commit_metadata(struct inode *inode)
1234 {
1235 struct writeback_control wbc = {
1236 .sync_mode = WB_SYNC_ALL
1237 };
1238
1239 trace_ext4_nfs_commit_metadata(inode);
1240 return ext4_write_inode(inode, &wbc);
1241 }
1242
1243
1244
1245
1246
1247
1248
1249 static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
1250 gfp_t wait)
1251 {
1252 journal_t *journal = EXT4_SB(sb)->s_journal;
1253
1254 WARN_ON(PageChecked(page));
1255 if (!page_has_buffers(page))
1256 return 0;
1257 if (journal)
1258 return jbd2_journal_try_to_free_buffers(journal, page,
1259 wait & ~__GFP_DIRECT_RECLAIM);
1260 return try_to_free_buffers(page);
1261 }
1262
1263 #ifdef CONFIG_FS_ENCRYPTION
1264 static int ext4_get_context(struct inode *inode, void *ctx, size_t len)
1265 {
1266 return ext4_xattr_get(inode, EXT4_XATTR_INDEX_ENCRYPTION,
1267 EXT4_XATTR_NAME_ENCRYPTION_CONTEXT, ctx, len);
1268 }
1269
1270 static int ext4_set_context(struct inode *inode, const void *ctx, size_t len,
1271 void *fs_data)
1272 {
1273 handle_t *handle = fs_data;
1274 int res, res2, credits, retries = 0;
1275
1276
1277
1278
1279
1280
1281
1282 if (inode->i_ino == EXT4_ROOT_INO)
1283 return -EPERM;
1284
1285 if (WARN_ON_ONCE(IS_DAX(inode) && i_size_read(inode)))
1286 return -EINVAL;
1287
1288 res = ext4_convert_inline_data(inode);
1289 if (res)
1290 return res;
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300 if (handle) {
1301 res = ext4_xattr_set_handle(handle, inode,
1302 EXT4_XATTR_INDEX_ENCRYPTION,
1303 EXT4_XATTR_NAME_ENCRYPTION_CONTEXT,
1304 ctx, len, 0);
1305 if (!res) {
1306 ext4_set_inode_flag(inode, EXT4_INODE_ENCRYPT);
1307 ext4_clear_inode_state(inode,
1308 EXT4_STATE_MAY_INLINE_DATA);
1309
1310
1311
1312
1313 ext4_set_inode_flags(inode);
1314 }
1315 return res;
1316 }
1317
1318 res = dquot_initialize(inode);
1319 if (res)
1320 return res;
1321 retry:
1322 res = ext4_xattr_set_credits(inode, len, false ,
1323 &credits);
1324 if (res)
1325 return res;
1326
1327 handle = ext4_journal_start(inode, EXT4_HT_MISC, credits);
1328 if (IS_ERR(handle))
1329 return PTR_ERR(handle);
1330
1331 res = ext4_xattr_set_handle(handle, inode, EXT4_XATTR_INDEX_ENCRYPTION,
1332 EXT4_XATTR_NAME_ENCRYPTION_CONTEXT,
1333 ctx, len, 0);
1334 if (!res) {
1335 ext4_set_inode_flag(inode, EXT4_INODE_ENCRYPT);
1336
1337
1338
1339
1340 ext4_set_inode_flags(inode);
1341 res = ext4_mark_inode_dirty(handle, inode);
1342 if (res)
1343 EXT4_ERROR_INODE(inode, "Failed to mark inode dirty");
1344 }
1345 res2 = ext4_journal_stop(handle);
1346
1347 if (res == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
1348 goto retry;
1349 if (!res)
1350 res = res2;
1351 return res;
1352 }
1353
1354 static bool ext4_dummy_context(struct inode *inode)
1355 {
1356 return DUMMY_ENCRYPTION_ENABLED(EXT4_SB(inode->i_sb));
1357 }
1358
1359 static const struct fscrypt_operations ext4_cryptops = {
1360 .key_prefix = "ext4:",
1361 .get_context = ext4_get_context,
1362 .set_context = ext4_set_context,
1363 .dummy_context = ext4_dummy_context,
1364 .empty_dir = ext4_empty_dir,
1365 .max_namelen = EXT4_NAME_LEN,
1366 };
1367 #endif
1368
1369 #ifdef CONFIG_QUOTA
1370 static const char * const quotatypes[] = INITQFNAMES;
1371 #define QTYPE2NAME(t) (quotatypes[t])
1372
1373 static int ext4_write_dquot(struct dquot *dquot);
1374 static int ext4_acquire_dquot(struct dquot *dquot);
1375 static int ext4_release_dquot(struct dquot *dquot);
1376 static int ext4_mark_dquot_dirty(struct dquot *dquot);
1377 static int ext4_write_info(struct super_block *sb, int type);
1378 static int ext4_quota_on(struct super_block *sb, int type, int format_id,
1379 const struct path *path);
1380 static int ext4_quota_on_mount(struct super_block *sb, int type);
1381 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
1382 size_t len, loff_t off);
1383 static ssize_t ext4_quota_write(struct super_block *sb, int type,
1384 const char *data, size_t len, loff_t off);
1385 static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
1386 unsigned int flags);
1387 static int ext4_enable_quotas(struct super_block *sb);
1388 static int ext4_get_next_id(struct super_block *sb, struct kqid *qid);
1389
1390 static struct dquot **ext4_get_dquots(struct inode *inode)
1391 {
1392 return EXT4_I(inode)->i_dquot;
1393 }
1394
1395 static const struct dquot_operations ext4_quota_operations = {
1396 .get_reserved_space = ext4_get_reserved_space,
1397 .write_dquot = ext4_write_dquot,
1398 .acquire_dquot = ext4_acquire_dquot,
1399 .release_dquot = ext4_release_dquot,
1400 .mark_dirty = ext4_mark_dquot_dirty,
1401 .write_info = ext4_write_info,
1402 .alloc_dquot = dquot_alloc,
1403 .destroy_dquot = dquot_destroy,
1404 .get_projid = ext4_get_projid,
1405 .get_inode_usage = ext4_get_inode_usage,
1406 .get_next_id = ext4_get_next_id,
1407 };
1408
1409 static const struct quotactl_ops ext4_qctl_operations = {
1410 .quota_on = ext4_quota_on,
1411 .quota_off = ext4_quota_off,
1412 .quota_sync = dquot_quota_sync,
1413 .get_state = dquot_get_state,
1414 .set_info = dquot_set_dqinfo,
1415 .get_dqblk = dquot_get_dqblk,
1416 .set_dqblk = dquot_set_dqblk,
1417 .get_nextdqblk = dquot_get_next_dqblk,
1418 };
1419 #endif
1420
1421 static const struct super_operations ext4_sops = {
1422 .alloc_inode = ext4_alloc_inode,
1423 .free_inode = ext4_free_in_core_inode,
1424 .destroy_inode = ext4_destroy_inode,
1425 .write_inode = ext4_write_inode,
1426 .dirty_inode = ext4_dirty_inode,
1427 .drop_inode = ext4_drop_inode,
1428 .evict_inode = ext4_evict_inode,
1429 .put_super = ext4_put_super,
1430 .sync_fs = ext4_sync_fs,
1431 .freeze_fs = ext4_freeze,
1432 .unfreeze_fs = ext4_unfreeze,
1433 .statfs = ext4_statfs,
1434 .remount_fs = ext4_remount,
1435 .show_options = ext4_show_options,
1436 #ifdef CONFIG_QUOTA
1437 .quota_read = ext4_quota_read,
1438 .quota_write = ext4_quota_write,
1439 .get_dquots = ext4_get_dquots,
1440 #endif
1441 .bdev_try_to_free_page = bdev_try_to_free_page,
1442 };
1443
1444 static const struct export_operations ext4_export_ops = {
1445 .fh_to_dentry = ext4_fh_to_dentry,
1446 .fh_to_parent = ext4_fh_to_parent,
1447 .get_parent = ext4_get_parent,
1448 .commit_metadata = ext4_nfs_commit_metadata,
1449 };
1450
1451 enum {
1452 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
1453 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
1454 Opt_nouid32, Opt_debug, Opt_removed,
1455 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
1456 Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload,
1457 Opt_commit, Opt_min_batch_time, Opt_max_batch_time, Opt_journal_dev,
1458 Opt_journal_path, Opt_journal_checksum, Opt_journal_async_commit,
1459 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
1460 Opt_data_err_abort, Opt_data_err_ignore, Opt_test_dummy_encryption,
1461 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
1462 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
1463 Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err,
1464 Opt_usrquota, Opt_grpquota, Opt_prjquota, Opt_i_version, Opt_dax,
1465 Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_warn_on_error,
1466 Opt_nowarn_on_error, Opt_mblk_io_submit,
1467 Opt_lazytime, Opt_nolazytime, Opt_debug_want_extra_isize,
1468 Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity,
1469 Opt_inode_readahead_blks, Opt_journal_ioprio,
1470 Opt_dioread_nolock, Opt_dioread_lock,
1471 Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable,
1472 Opt_max_dir_size_kb, Opt_nojournal_checksum, Opt_nombcache,
1473 };
1474
1475 static const match_table_t tokens = {
1476 {Opt_bsd_df, "bsddf"},
1477 {Opt_minix_df, "minixdf"},
1478 {Opt_grpid, "grpid"},
1479 {Opt_grpid, "bsdgroups"},
1480 {Opt_nogrpid, "nogrpid"},
1481 {Opt_nogrpid, "sysvgroups"},
1482 {Opt_resgid, "resgid=%u"},
1483 {Opt_resuid, "resuid=%u"},
1484 {Opt_sb, "sb=%u"},
1485 {Opt_err_cont, "errors=continue"},
1486 {Opt_err_panic, "errors=panic"},
1487 {Opt_err_ro, "errors=remount-ro"},
1488 {Opt_nouid32, "nouid32"},
1489 {Opt_debug, "debug"},
1490 {Opt_removed, "oldalloc"},
1491 {Opt_removed, "orlov"},
1492 {Opt_user_xattr, "user_xattr"},
1493 {Opt_nouser_xattr, "nouser_xattr"},
1494 {Opt_acl, "acl"},
1495 {Opt_noacl, "noacl"},
1496 {Opt_noload, "norecovery"},
1497 {Opt_noload, "noload"},
1498 {Opt_removed, "nobh"},
1499 {Opt_removed, "bh"},
1500 {Opt_commit, "commit=%u"},
1501 {Opt_min_batch_time, "min_batch_time=%u"},
1502 {Opt_max_batch_time, "max_batch_time=%u"},
1503 {Opt_journal_dev, "journal_dev=%u"},
1504 {Opt_journal_path, "journal_path=%s"},
1505 {Opt_journal_checksum, "journal_checksum"},
1506 {Opt_nojournal_checksum, "nojournal_checksum"},
1507 {Opt_journal_async_commit, "journal_async_commit"},
1508 {Opt_abort, "abort"},
1509 {Opt_data_journal, "data=journal"},
1510 {Opt_data_ordered, "data=ordered"},
1511 {Opt_data_writeback, "data=writeback"},
1512 {Opt_data_err_abort, "data_err=abort"},
1513 {Opt_data_err_ignore, "data_err=ignore"},
1514 {Opt_offusrjquota, "usrjquota="},
1515 {Opt_usrjquota, "usrjquota=%s"},
1516 {Opt_offgrpjquota, "grpjquota="},
1517 {Opt_grpjquota, "grpjquota=%s"},
1518 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
1519 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
1520 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
1521 {Opt_grpquota, "grpquota"},
1522 {Opt_noquota, "noquota"},
1523 {Opt_quota, "quota"},
1524 {Opt_usrquota, "usrquota"},
1525 {Opt_prjquota, "prjquota"},
1526 {Opt_barrier, "barrier=%u"},
1527 {Opt_barrier, "barrier"},
1528 {Opt_nobarrier, "nobarrier"},
1529 {Opt_i_version, "i_version"},
1530 {Opt_dax, "dax"},
1531 {Opt_stripe, "stripe=%u"},
1532 {Opt_delalloc, "delalloc"},
1533 {Opt_warn_on_error, "warn_on_error"},
1534 {Opt_nowarn_on_error, "nowarn_on_error"},
1535 {Opt_lazytime, "lazytime"},
1536 {Opt_nolazytime, "nolazytime"},
1537 {Opt_debug_want_extra_isize, "debug_want_extra_isize=%u"},
1538 {Opt_nodelalloc, "nodelalloc"},
1539 {Opt_removed, "mblk_io_submit"},
1540 {Opt_removed, "nomblk_io_submit"},
1541 {Opt_block_validity, "block_validity"},
1542 {Opt_noblock_validity, "noblock_validity"},
1543 {Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
1544 {Opt_journal_ioprio, "journal_ioprio=%u"},
1545 {Opt_auto_da_alloc, "auto_da_alloc=%u"},
1546 {Opt_auto_da_alloc, "auto_da_alloc"},
1547 {Opt_noauto_da_alloc, "noauto_da_alloc"},
1548 {Opt_dioread_nolock, "dioread_nolock"},
1549 {Opt_dioread_lock, "dioread_lock"},
1550 {Opt_discard, "discard"},
1551 {Opt_nodiscard, "nodiscard"},
1552 {Opt_init_itable, "init_itable=%u"},
1553 {Opt_init_itable, "init_itable"},
1554 {Opt_noinit_itable, "noinit_itable"},
1555 {Opt_max_dir_size_kb, "max_dir_size_kb=%u"},
1556 {Opt_test_dummy_encryption, "test_dummy_encryption"},
1557 {Opt_nombcache, "nombcache"},
1558 {Opt_nombcache, "no_mbcache"},
1559 {Opt_removed, "check=none"},
1560 {Opt_removed, "nocheck"},
1561 {Opt_removed, "reservation"},
1562 {Opt_removed, "noreservation"},
1563 {Opt_removed, "journal=%u"},
1564 {Opt_err, NULL},
1565 };
1566
1567 static ext4_fsblk_t get_sb_block(void **data)
1568 {
1569 ext4_fsblk_t sb_block;
1570 char *options = (char *) *data;
1571
1572 if (!options || strncmp(options, "sb=", 3) != 0)
1573 return 1;
1574
1575 options += 3;
1576
1577 sb_block = simple_strtoul(options, &options, 0);
1578 if (*options && *options != ',') {
1579 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
1580 (char *) *data);
1581 return 1;
1582 }
1583 if (*options == ',')
1584 options++;
1585 *data = (void *) options;
1586
1587 return sb_block;
1588 }
1589
1590 #define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
1591 static const char deprecated_msg[] =
1592 "Mount option \"%s\" will be removed by %s\n"
1593 "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
1594
1595 #ifdef CONFIG_QUOTA
1596 static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
1597 {
1598 struct ext4_sb_info *sbi = EXT4_SB(sb);
1599 char *qname, *old_qname = get_qf_name(sb, sbi, qtype);
1600 int ret = -1;
1601
1602 if (sb_any_quota_loaded(sb) && !old_qname) {
1603 ext4_msg(sb, KERN_ERR,
1604 "Cannot change journaled "
1605 "quota options when quota turned on");
1606 return -1;
1607 }
1608 if (ext4_has_feature_quota(sb)) {
1609 ext4_msg(sb, KERN_INFO, "Journaled quota options "
1610 "ignored when QUOTA feature is enabled");
1611 return 1;
1612 }
1613 qname = match_strdup(args);
1614 if (!qname) {
1615 ext4_msg(sb, KERN_ERR,
1616 "Not enough memory for storing quotafile name");
1617 return -1;
1618 }
1619 if (old_qname) {
1620 if (strcmp(old_qname, qname) == 0)
1621 ret = 1;
1622 else
1623 ext4_msg(sb, KERN_ERR,
1624 "%s quota file already specified",
1625 QTYPE2NAME(qtype));
1626 goto errout;
1627 }
1628 if (strchr(qname, '/')) {
1629 ext4_msg(sb, KERN_ERR,
1630 "quotafile must be on filesystem root");
1631 goto errout;
1632 }
1633 rcu_assign_pointer(sbi->s_qf_names[qtype], qname);
1634 set_opt(sb, QUOTA);
1635 return 1;
1636 errout:
1637 kfree(qname);
1638 return ret;
1639 }
1640
1641 static int clear_qf_name(struct super_block *sb, int qtype)
1642 {
1643
1644 struct ext4_sb_info *sbi = EXT4_SB(sb);
1645 char *old_qname = get_qf_name(sb, sbi, qtype);
1646
1647 if (sb_any_quota_loaded(sb) && old_qname) {
1648 ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options"
1649 " when quota turned on");
1650 return -1;
1651 }
1652 rcu_assign_pointer(sbi->s_qf_names[qtype], NULL);
1653 synchronize_rcu();
1654 kfree(old_qname);
1655 return 1;
1656 }
1657 #endif
1658
1659 #define MOPT_SET 0x0001
1660 #define MOPT_CLEAR 0x0002
1661 #define MOPT_NOSUPPORT 0x0004
1662 #define MOPT_EXPLICIT 0x0008
1663 #define MOPT_CLEAR_ERR 0x0010
1664 #define MOPT_GTE0 0x0020
1665 #ifdef CONFIG_QUOTA
1666 #define MOPT_Q 0
1667 #define MOPT_QFMT 0x0040
1668 #else
1669 #define MOPT_Q MOPT_NOSUPPORT
1670 #define MOPT_QFMT MOPT_NOSUPPORT
1671 #endif
1672 #define MOPT_DATAJ 0x0080
1673 #define MOPT_NO_EXT2 0x0100
1674 #define MOPT_NO_EXT3 0x0200
1675 #define MOPT_EXT4_ONLY (MOPT_NO_EXT2 | MOPT_NO_EXT3)
1676 #define MOPT_STRING 0x0400
1677
1678 static const struct mount_opts {
1679 int token;
1680 int mount_opt;
1681 int flags;
1682 } ext4_mount_opts[] = {
1683 {Opt_minix_df, EXT4_MOUNT_MINIX_DF, MOPT_SET},
1684 {Opt_bsd_df, EXT4_MOUNT_MINIX_DF, MOPT_CLEAR},
1685 {Opt_grpid, EXT4_MOUNT_GRPID, MOPT_SET},
1686 {Opt_nogrpid, EXT4_MOUNT_GRPID, MOPT_CLEAR},
1687 {Opt_block_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_SET},
1688 {Opt_noblock_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_CLEAR},
1689 {Opt_dioread_nolock, EXT4_MOUNT_DIOREAD_NOLOCK,
1690 MOPT_EXT4_ONLY | MOPT_SET},
1691 {Opt_dioread_lock, EXT4_MOUNT_DIOREAD_NOLOCK,
1692 MOPT_EXT4_ONLY | MOPT_CLEAR},
1693 {Opt_discard, EXT4_MOUNT_DISCARD, MOPT_SET},
1694 {Opt_nodiscard, EXT4_MOUNT_DISCARD, MOPT_CLEAR},
1695 {Opt_delalloc, EXT4_MOUNT_DELALLOC,
1696 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
1697 {Opt_nodelalloc, EXT4_MOUNT_DELALLOC,
1698 MOPT_EXT4_ONLY | MOPT_CLEAR},
1699 {Opt_warn_on_error, EXT4_MOUNT_WARN_ON_ERROR, MOPT_SET},
1700 {Opt_nowarn_on_error, EXT4_MOUNT_WARN_ON_ERROR, MOPT_CLEAR},
1701 {Opt_nojournal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
1702 MOPT_EXT4_ONLY | MOPT_CLEAR},
1703 {Opt_journal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
1704 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
1705 {Opt_journal_async_commit, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT |
1706 EXT4_MOUNT_JOURNAL_CHECKSUM),
1707 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
1708 {Opt_noload, EXT4_MOUNT_NOLOAD, MOPT_NO_EXT2 | MOPT_SET},
1709 {Opt_err_panic, EXT4_MOUNT_ERRORS_PANIC, MOPT_SET | MOPT_CLEAR_ERR},
1710 {Opt_err_ro, EXT4_MOUNT_ERRORS_RO, MOPT_SET | MOPT_CLEAR_ERR},
1711 {Opt_err_cont, EXT4_MOUNT_ERRORS_CONT, MOPT_SET | MOPT_CLEAR_ERR},
1712 {Opt_data_err_abort, EXT4_MOUNT_DATA_ERR_ABORT,
1713 MOPT_NO_EXT2},
1714 {Opt_data_err_ignore, EXT4_MOUNT_DATA_ERR_ABORT,
1715 MOPT_NO_EXT2},
1716 {Opt_barrier, EXT4_MOUNT_BARRIER, MOPT_SET},
1717 {Opt_nobarrier, EXT4_MOUNT_BARRIER, MOPT_CLEAR},
1718 {Opt_noauto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_SET},
1719 {Opt_auto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_CLEAR},
1720 {Opt_noinit_itable, EXT4_MOUNT_INIT_INODE_TABLE, MOPT_CLEAR},
1721 {Opt_commit, 0, MOPT_GTE0},
1722 {Opt_max_batch_time, 0, MOPT_GTE0},
1723 {Opt_min_batch_time, 0, MOPT_GTE0},
1724 {Opt_inode_readahead_blks, 0, MOPT_GTE0},
1725 {Opt_init_itable, 0, MOPT_GTE0},
1726 {Opt_dax, EXT4_MOUNT_DAX, MOPT_SET},
1727 {Opt_stripe, 0, MOPT_GTE0},
1728 {Opt_resuid, 0, MOPT_GTE0},
1729 {Opt_resgid, 0, MOPT_GTE0},
1730 {Opt_journal_dev, 0, MOPT_NO_EXT2 | MOPT_GTE0},
1731 {Opt_journal_path, 0, MOPT_NO_EXT2 | MOPT_STRING},
1732 {Opt_journal_ioprio, 0, MOPT_NO_EXT2 | MOPT_GTE0},
1733 {Opt_data_journal, EXT4_MOUNT_JOURNAL_DATA, MOPT_NO_EXT2 | MOPT_DATAJ},
1734 {Opt_data_ordered, EXT4_MOUNT_ORDERED_DATA, MOPT_NO_EXT2 | MOPT_DATAJ},
1735 {Opt_data_writeback, EXT4_MOUNT_WRITEBACK_DATA,
1736 MOPT_NO_EXT2 | MOPT_DATAJ},
1737 {Opt_user_xattr, EXT4_MOUNT_XATTR_USER, MOPT_SET},
1738 {Opt_nouser_xattr, EXT4_MOUNT_XATTR_USER, MOPT_CLEAR},
1739 #ifdef CONFIG_EXT4_FS_POSIX_ACL
1740 {Opt_acl, EXT4_MOUNT_POSIX_ACL, MOPT_SET},
1741 {Opt_noacl, EXT4_MOUNT_POSIX_ACL, MOPT_CLEAR},
1742 #else
1743 {Opt_acl, 0, MOPT_NOSUPPORT},
1744 {Opt_noacl, 0, MOPT_NOSUPPORT},
1745 #endif
1746 {Opt_nouid32, EXT4_MOUNT_NO_UID32, MOPT_SET},
1747 {Opt_debug, EXT4_MOUNT_DEBUG, MOPT_SET},
1748 {Opt_debug_want_extra_isize, 0, MOPT_GTE0},
1749 {Opt_quota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA, MOPT_SET | MOPT_Q},
1750 {Opt_usrquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA,
1751 MOPT_SET | MOPT_Q},
1752 {Opt_grpquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_GRPQUOTA,
1753 MOPT_SET | MOPT_Q},
1754 {Opt_prjquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_PRJQUOTA,
1755 MOPT_SET | MOPT_Q},
1756 {Opt_noquota, (EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA |
1757 EXT4_MOUNT_GRPQUOTA | EXT4_MOUNT_PRJQUOTA),
1758 MOPT_CLEAR | MOPT_Q},
1759 {Opt_usrjquota, 0, MOPT_Q},
1760 {Opt_grpjquota, 0, MOPT_Q},
1761 {Opt_offusrjquota, 0, MOPT_Q},
1762 {Opt_offgrpjquota, 0, MOPT_Q},
1763 {Opt_jqfmt_vfsold, QFMT_VFS_OLD, MOPT_QFMT},
1764 {Opt_jqfmt_vfsv0, QFMT_VFS_V0, MOPT_QFMT},
1765 {Opt_jqfmt_vfsv1, QFMT_VFS_V1, MOPT_QFMT},
1766 {Opt_max_dir_size_kb, 0, MOPT_GTE0},
1767 {Opt_test_dummy_encryption, 0, MOPT_GTE0},
1768 {Opt_nombcache, EXT4_MOUNT_NO_MBCACHE, MOPT_SET},
1769 {Opt_err, 0, 0}
1770 };
1771
1772 #ifdef CONFIG_UNICODE
1773 static const struct ext4_sb_encodings {
1774 __u16 magic;
1775 char *name;
1776 char *version;
1777 } ext4_sb_encoding_map[] = {
1778 {EXT4_ENC_UTF8_12_1, "utf8", "12.1.0"},
1779 };
1780
1781 static int ext4_sb_read_encoding(const struct ext4_super_block *es,
1782 const struct ext4_sb_encodings **encoding,
1783 __u16 *flags)
1784 {
1785 __u16 magic = le16_to_cpu(es->s_encoding);
1786 int i;
1787
1788 for (i = 0; i < ARRAY_SIZE(ext4_sb_encoding_map); i++)
1789 if (magic == ext4_sb_encoding_map[i].magic)
1790 break;
1791
1792 if (i >= ARRAY_SIZE(ext4_sb_encoding_map))
1793 return -EINVAL;
1794
1795 *encoding = &ext4_sb_encoding_map[i];
1796 *flags = le16_to_cpu(es->s_encoding_flags);
1797
1798 return 0;
1799 }
1800 #endif
1801
1802 static int handle_mount_opt(struct super_block *sb, char *opt, int token,
1803 substring_t *args, unsigned long *journal_devnum,
1804 unsigned int *journal_ioprio, int is_remount)
1805 {
1806 struct ext4_sb_info *sbi = EXT4_SB(sb);
1807 const struct mount_opts *m;
1808 kuid_t uid;
1809 kgid_t gid;
1810 int arg = 0;
1811
1812 #ifdef CONFIG_QUOTA
1813 if (token == Opt_usrjquota)
1814 return set_qf_name(sb, USRQUOTA, &args[0]);
1815 else if (token == Opt_grpjquota)
1816 return set_qf_name(sb, GRPQUOTA, &args[0]);
1817 else if (token == Opt_offusrjquota)
1818 return clear_qf_name(sb, USRQUOTA);
1819 else if (token == Opt_offgrpjquota)
1820 return clear_qf_name(sb, GRPQUOTA);
1821 #endif
1822 switch (token) {
1823 case Opt_noacl:
1824 case Opt_nouser_xattr:
1825 ext4_msg(sb, KERN_WARNING, deprecated_msg, opt, "3.5");
1826 break;
1827 case Opt_sb:
1828 return 1;
1829 case Opt_removed:
1830 ext4_msg(sb, KERN_WARNING, "Ignoring removed %s option", opt);
1831 return 1;
1832 case Opt_abort:
1833 sbi->s_mount_flags |= EXT4_MF_FS_ABORTED;
1834 return 1;
1835 case Opt_i_version:
1836 sb->s_flags |= SB_I_VERSION;
1837 return 1;
1838 case Opt_lazytime:
1839 sb->s_flags |= SB_LAZYTIME;
1840 return 1;
1841 case Opt_nolazytime:
1842 sb->s_flags &= ~SB_LAZYTIME;
1843 return 1;
1844 }
1845
1846 for (m = ext4_mount_opts; m->token != Opt_err; m++)
1847 if (token == m->token)
1848 break;
1849
1850 if (m->token == Opt_err) {
1851 ext4_msg(sb, KERN_ERR, "Unrecognized mount option \"%s\" "
1852 "or missing value", opt);
1853 return -1;
1854 }
1855
1856 if ((m->flags & MOPT_NO_EXT2) && IS_EXT2_SB(sb)) {
1857 ext4_msg(sb, KERN_ERR,
1858 "Mount option \"%s\" incompatible with ext2", opt);
1859 return -1;
1860 }
1861 if ((m->flags & MOPT_NO_EXT3) && IS_EXT3_SB(sb)) {
1862 ext4_msg(sb, KERN_ERR,
1863 "Mount option \"%s\" incompatible with ext3", opt);
1864 return -1;
1865 }
1866
1867 if (args->from && !(m->flags & MOPT_STRING) && match_int(args, &arg))
1868 return -1;
1869 if (args->from && (m->flags & MOPT_GTE0) && (arg < 0))
1870 return -1;
1871 if (m->flags & MOPT_EXPLICIT) {
1872 if (m->mount_opt & EXT4_MOUNT_DELALLOC) {
1873 set_opt2(sb, EXPLICIT_DELALLOC);
1874 } else if (m->mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) {
1875 set_opt2(sb, EXPLICIT_JOURNAL_CHECKSUM);
1876 } else
1877 return -1;
1878 }
1879 if (m->flags & MOPT_CLEAR_ERR)
1880 clear_opt(sb, ERRORS_MASK);
1881 if (token == Opt_noquota && sb_any_quota_loaded(sb)) {
1882 ext4_msg(sb, KERN_ERR, "Cannot change quota "
1883 "options when quota turned on");
1884 return -1;
1885 }
1886
1887 if (m->flags & MOPT_NOSUPPORT) {
1888 ext4_msg(sb, KERN_ERR, "%s option not supported", opt);
1889 } else if (token == Opt_commit) {
1890 if (arg == 0)
1891 arg = JBD2_DEFAULT_MAX_COMMIT_AGE;
1892 else if (arg > INT_MAX / HZ) {
1893 ext4_msg(sb, KERN_ERR,
1894 "Invalid commit interval %d, "
1895 "must be smaller than %d",
1896 arg, INT_MAX / HZ);
1897 return -1;
1898 }
1899 sbi->s_commit_interval = HZ * arg;
1900 } else if (token == Opt_debug_want_extra_isize) {
1901 if ((arg & 1) ||
1902 (arg < 4) ||
1903 (arg > (sbi->s_inode_size - EXT4_GOOD_OLD_INODE_SIZE))) {
1904 ext4_msg(sb, KERN_ERR,
1905 "Invalid want_extra_isize %d", arg);
1906 return -1;
1907 }
1908 sbi->s_want_extra_isize = arg;
1909 } else if (token == Opt_max_batch_time) {
1910 sbi->s_max_batch_time = arg;
1911 } else if (token == Opt_min_batch_time) {
1912 sbi->s_min_batch_time = arg;
1913 } else if (token == Opt_inode_readahead_blks) {
1914 if (arg && (arg > (1 << 30) || !is_power_of_2(arg))) {
1915 ext4_msg(sb, KERN_ERR,
1916 "EXT4-fs: inode_readahead_blks must be "
1917 "0 or a power of 2 smaller than 2^31");
1918 return -1;
1919 }
1920 sbi->s_inode_readahead_blks = arg;
1921 } else if (token == Opt_init_itable) {
1922 set_opt(sb, INIT_INODE_TABLE);
1923 if (!args->from)
1924 arg = EXT4_DEF_LI_WAIT_MULT;
1925 sbi->s_li_wait_mult = arg;
1926 } else if (token == Opt_max_dir_size_kb) {
1927 sbi->s_max_dir_size_kb = arg;
1928 } else if (token == Opt_stripe) {
1929 sbi->s_stripe = arg;
1930 } else if (token == Opt_resuid) {
1931 uid = make_kuid(current_user_ns(), arg);
1932 if (!uid_valid(uid)) {
1933 ext4_msg(sb, KERN_ERR, "Invalid uid value %d", arg);
1934 return -1;
1935 }
1936 sbi->s_resuid = uid;
1937 } else if (token == Opt_resgid) {
1938 gid = make_kgid(current_user_ns(), arg);
1939 if (!gid_valid(gid)) {
1940 ext4_msg(sb, KERN_ERR, "Invalid gid value %d", arg);
1941 return -1;
1942 }
1943 sbi->s_resgid = gid;
1944 } else if (token == Opt_journal_dev) {
1945 if (is_remount) {
1946 ext4_msg(sb, KERN_ERR,
1947 "Cannot specify journal on remount");
1948 return -1;
1949 }
1950 *journal_devnum = arg;
1951 } else if (token == Opt_journal_path) {
1952 char *journal_path;
1953 struct inode *journal_inode;
1954 struct path path;
1955 int error;
1956
1957 if (is_remount) {
1958 ext4_msg(sb, KERN_ERR,
1959 "Cannot specify journal on remount");
1960 return -1;
1961 }
1962 journal_path = match_strdup(&args[0]);
1963 if (!journal_path) {
1964 ext4_msg(sb, KERN_ERR, "error: could not dup "
1965 "journal device string");
1966 return -1;
1967 }
1968
1969 error = kern_path(journal_path, LOOKUP_FOLLOW, &path);
1970 if (error) {
1971 ext4_msg(sb, KERN_ERR, "error: could not find "
1972 "journal device path: error %d", error);
1973 kfree(journal_path);
1974 return -1;
1975 }
1976
1977 journal_inode = d_inode(path.dentry);
1978 if (!S_ISBLK(journal_inode->i_mode)) {
1979 ext4_msg(sb, KERN_ERR, "error: journal path %s "
1980 "is not a block device", journal_path);
1981 path_put(&path);
1982 kfree(journal_path);
1983 return -1;
1984 }
1985
1986 *journal_devnum = new_encode_dev(journal_inode->i_rdev);
1987 path_put(&path);
1988 kfree(journal_path);
1989 } else if (token == Opt_journal_ioprio) {
1990 if (arg > 7) {
1991 ext4_msg(sb, KERN_ERR, "Invalid journal IO priority"
1992 " (must be 0-7)");
1993 return -1;
1994 }
1995 *journal_ioprio =
1996 IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, arg);
1997 } else if (token == Opt_test_dummy_encryption) {
1998 #ifdef CONFIG_FS_ENCRYPTION
1999 sbi->s_mount_flags |= EXT4_MF_TEST_DUMMY_ENCRYPTION;
2000 ext4_msg(sb, KERN_WARNING,
2001 "Test dummy encryption mode enabled");
2002 #else
2003 ext4_msg(sb, KERN_WARNING,
2004 "Test dummy encryption mount option ignored");
2005 #endif
2006 } else if (m->flags & MOPT_DATAJ) {
2007 if (is_remount) {
2008 if (!sbi->s_journal)
2009 ext4_msg(sb, KERN_WARNING, "Remounting file system with no journal so ignoring journalled data option");
2010 else if (test_opt(sb, DATA_FLAGS) != m->mount_opt) {
2011 ext4_msg(sb, KERN_ERR,
2012 "Cannot change data mode on remount");
2013 return -1;
2014 }
2015 } else {
2016 clear_opt(sb, DATA_FLAGS);
2017 sbi->s_mount_opt |= m->mount_opt;
2018 }
2019 #ifdef CONFIG_QUOTA
2020 } else if (m->flags & MOPT_QFMT) {
2021 if (sb_any_quota_loaded(sb) &&
2022 sbi->s_jquota_fmt != m->mount_opt) {
2023 ext4_msg(sb, KERN_ERR, "Cannot change journaled "
2024 "quota options when quota turned on");
2025 return -1;
2026 }
2027 if (ext4_has_feature_quota(sb)) {
2028 ext4_msg(sb, KERN_INFO,
2029 "Quota format mount options ignored "
2030 "when QUOTA feature is enabled");
2031 return 1;
2032 }
2033 sbi->s_jquota_fmt = m->mount_opt;
2034 #endif
2035 } else if (token == Opt_dax) {
2036 #ifdef CONFIG_FS_DAX
2037 ext4_msg(sb, KERN_WARNING,
2038 "DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
2039 sbi->s_mount_opt |= m->mount_opt;
2040 #else
2041 ext4_msg(sb, KERN_INFO, "dax option not supported");
2042 return -1;
2043 #endif
2044 } else if (token == Opt_data_err_abort) {
2045 sbi->s_mount_opt |= m->mount_opt;
2046 } else if (token == Opt_data_err_ignore) {
2047 sbi->s_mount_opt &= ~m->mount_opt;
2048 } else {
2049 if (!args->from)
2050 arg = 1;
2051 if (m->flags & MOPT_CLEAR)
2052 arg = !arg;
2053 else if (unlikely(!(m->flags & MOPT_SET))) {
2054 ext4_msg(sb, KERN_WARNING,
2055 "buggy handling of option %s", opt);
2056 WARN_ON(1);
2057 return -1;
2058 }
2059 if (arg != 0)
2060 sbi->s_mount_opt |= m->mount_opt;
2061 else
2062 sbi->s_mount_opt &= ~m->mount_opt;
2063 }
2064 return 1;
2065 }
2066
2067 static int parse_options(char *options, struct super_block *sb,
2068 unsigned long *journal_devnum,
2069 unsigned int *journal_ioprio,
2070 int is_remount)
2071 {
2072 struct ext4_sb_info *sbi = EXT4_SB(sb);
2073 char *p, __maybe_unused *usr_qf_name, __maybe_unused *grp_qf_name;
2074 substring_t args[MAX_OPT_ARGS];
2075 int token;
2076
2077 if (!options)
2078 return 1;
2079
2080 while ((p = strsep(&options, ",")) != NULL) {
2081 if (!*p)
2082 continue;
2083
2084
2085
2086
2087 args[0].to = args[0].from = NULL;
2088 token = match_token(p, tokens, args);
2089 if (handle_mount_opt(sb, p, token, args, journal_devnum,
2090 journal_ioprio, is_remount) < 0)
2091 return 0;
2092 }
2093 #ifdef CONFIG_QUOTA
2094
2095
2096
2097
2098
2099 if (test_opt(sb, PRJQUOTA) && !ext4_has_feature_project(sb)) {
2100 ext4_msg(sb, KERN_ERR, "Project quota feature not enabled. "
2101 "Cannot enable project quota enforcement.");
2102 return 0;
2103 }
2104 usr_qf_name = get_qf_name(sb, sbi, USRQUOTA);
2105 grp_qf_name = get_qf_name(sb, sbi, GRPQUOTA);
2106 if (usr_qf_name || grp_qf_name) {
2107 if (test_opt(sb, USRQUOTA) && usr_qf_name)
2108 clear_opt(sb, USRQUOTA);
2109
2110 if (test_opt(sb, GRPQUOTA) && grp_qf_name)
2111 clear_opt(sb, GRPQUOTA);
2112
2113 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
2114 ext4_msg(sb, KERN_ERR, "old and new quota "
2115 "format mixing");
2116 return 0;
2117 }
2118
2119 if (!sbi->s_jquota_fmt) {
2120 ext4_msg(sb, KERN_ERR, "journaled quota format "
2121 "not specified");
2122 return 0;
2123 }
2124 }
2125 #endif
2126 if (test_opt(sb, DIOREAD_NOLOCK)) {
2127 int blocksize =
2128 BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);
2129
2130 if (blocksize < PAGE_SIZE) {
2131 ext4_msg(sb, KERN_ERR, "can't mount with "
2132 "dioread_nolock if block size != PAGE_SIZE");
2133 return 0;
2134 }
2135 }
2136 return 1;
2137 }
2138
2139 static inline void ext4_show_quota_options(struct seq_file *seq,
2140 struct super_block *sb)
2141 {
2142 #if defined(CONFIG_QUOTA)
2143 struct ext4_sb_info *sbi = EXT4_SB(sb);
2144 char *usr_qf_name, *grp_qf_name;
2145
2146 if (sbi->s_jquota_fmt) {
2147 char *fmtname = "";
2148
2149 switch (sbi->s_jquota_fmt) {
2150 case QFMT_VFS_OLD:
2151 fmtname = "vfsold";
2152 break;
2153 case QFMT_VFS_V0:
2154 fmtname = "vfsv0";
2155 break;
2156 case QFMT_VFS_V1:
2157 fmtname = "vfsv1";
2158 break;
2159 }
2160 seq_printf(seq, ",jqfmt=%s", fmtname);
2161 }
2162
2163 rcu_read_lock();
2164 usr_qf_name = rcu_dereference(sbi->s_qf_names[USRQUOTA]);
2165 grp_qf_name = rcu_dereference(sbi->s_qf_names[GRPQUOTA]);
2166 if (usr_qf_name)
2167 seq_show_option(seq, "usrjquota", usr_qf_name);
2168 if (grp_qf_name)
2169 seq_show_option(seq, "grpjquota", grp_qf_name);
2170 rcu_read_unlock();
2171 #endif
2172 }
2173
2174 static const char *token2str(int token)
2175 {
2176 const struct match_token *t;
2177
2178 for (t = tokens; t->token != Opt_err; t++)
2179 if (t->token == token && !strchr(t->pattern, '='))
2180 break;
2181 return t->pattern;
2182 }
2183
2184
2185
2186
2187
2188
2189 static int _ext4_show_options(struct seq_file *seq, struct super_block *sb,
2190 int nodefs)
2191 {
2192 struct ext4_sb_info *sbi = EXT4_SB(sb);
2193 struct ext4_super_block *es = sbi->s_es;
2194 int def_errors, def_mount_opt = sbi->s_def_mount_opt;
2195 const struct mount_opts *m;
2196 char sep = nodefs ? '\n' : ',';
2197
2198 #define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep)
2199 #define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg)
2200
2201 if (sbi->s_sb_block != 1)
2202 SEQ_OPTS_PRINT("sb=%llu", sbi->s_sb_block);
2203
2204 for (m = ext4_mount_opts; m->token != Opt_err; m++) {
2205 int want_set = m->flags & MOPT_SET;
2206 if (((m->flags & (MOPT_SET|MOPT_CLEAR)) == 0) ||
2207 (m->flags & MOPT_CLEAR_ERR))
2208 continue;
2209 if (!nodefs && !(m->mount_opt & (sbi->s_mount_opt ^ def_mount_opt)))
2210 continue;
2211 if ((want_set &&
2212 (sbi->s_mount_opt & m->mount_opt) != m->mount_opt) ||
2213 (!want_set && (sbi->s_mount_opt & m->mount_opt)))
2214 continue;
2215 SEQ_OPTS_PRINT("%s", token2str(m->token));
2216 }
2217
2218 if (nodefs || !uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT4_DEF_RESUID)) ||
2219 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID)
2220 SEQ_OPTS_PRINT("resuid=%u",
2221 from_kuid_munged(&init_user_ns, sbi->s_resuid));
2222 if (nodefs || !gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT4_DEF_RESGID)) ||
2223 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID)
2224 SEQ_OPTS_PRINT("resgid=%u",
2225 from_kgid_munged(&init_user_ns, sbi->s_resgid));
2226 def_errors = nodefs ? -1 : le16_to_cpu(es->s_errors);
2227 if (test_opt(sb, ERRORS_RO) && def_errors != EXT4_ERRORS_RO)
2228 SEQ_OPTS_PUTS("errors=remount-ro");
2229 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
2230 SEQ_OPTS_PUTS("errors=continue");
2231 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
2232 SEQ_OPTS_PUTS("errors=panic");
2233 if (nodefs || sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ)
2234 SEQ_OPTS_PRINT("commit=%lu", sbi->s_commit_interval / HZ);
2235 if (nodefs || sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME)
2236 SEQ_OPTS_PRINT("min_batch_time=%u", sbi->s_min_batch_time);
2237 if (nodefs || sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME)
2238 SEQ_OPTS_PRINT("max_batch_time=%u", sbi->s_max_batch_time);
2239 if (sb->s_flags & SB_I_VERSION)
2240 SEQ_OPTS_PUTS("i_version");
2241 if (nodefs || sbi->s_stripe)
2242 SEQ_OPTS_PRINT("stripe=%lu", sbi->s_stripe);
2243 if (nodefs || EXT4_MOUNT_DATA_FLAGS &
2244 (sbi->s_mount_opt ^ def_mount_opt)) {
2245 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
2246 SEQ_OPTS_PUTS("data=journal");
2247 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
2248 SEQ_OPTS_PUTS("data=ordered");
2249 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
2250 SEQ_OPTS_PUTS("data=writeback");
2251 }
2252 if (nodefs ||
2253 sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
2254 SEQ_OPTS_PRINT("inode_readahead_blks=%u",
2255 sbi->s_inode_readahead_blks);
2256
2257 if (test_opt(sb, INIT_INODE_TABLE) && (nodefs ||
2258 (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT)))
2259 SEQ_OPTS_PRINT("init_itable=%u", sbi->s_li_wait_mult);
2260 if (nodefs || sbi->s_max_dir_size_kb)
2261 SEQ_OPTS_PRINT("max_dir_size_kb=%u", sbi->s_max_dir_size_kb);
2262 if (test_opt(sb, DATA_ERR_ABORT))
2263 SEQ_OPTS_PUTS("data_err=abort");
2264 if (DUMMY_ENCRYPTION_ENABLED(sbi))
2265 SEQ_OPTS_PUTS("test_dummy_encryption");
2266
2267 ext4_show_quota_options(seq, sb);
2268 return 0;
2269 }
2270
2271 static int ext4_show_options(struct seq_file *seq, struct dentry *root)
2272 {
2273 return _ext4_show_options(seq, root->d_sb, 0);
2274 }
2275
2276 int ext4_seq_options_show(struct seq_file *seq, void *offset)
2277 {
2278 struct super_block *sb = seq->private;
2279 int rc;
2280
2281 seq_puts(seq, sb_rdonly(sb) ? "ro" : "rw");
2282 rc = _ext4_show_options(seq, sb, 1);
2283 seq_puts(seq, "\n");
2284 return rc;
2285 }
2286
2287 static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
2288 int read_only)
2289 {
2290 struct ext4_sb_info *sbi = EXT4_SB(sb);
2291 int err = 0;
2292
2293 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
2294 ext4_msg(sb, KERN_ERR, "revision level too high, "
2295 "forcing read-only mode");
2296 err = -EROFS;
2297 }
2298 if (read_only)
2299 goto done;
2300 if (!(sbi->s_mount_state & EXT4_VALID_FS))
2301 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
2302 "running e2fsck is recommended");
2303 else if (sbi->s_mount_state & EXT4_ERROR_FS)
2304 ext4_msg(sb, KERN_WARNING,
2305 "warning: mounting fs with errors, "
2306 "running e2fsck is recommended");
2307 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
2308 le16_to_cpu(es->s_mnt_count) >=
2309 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
2310 ext4_msg(sb, KERN_WARNING,
2311 "warning: maximal mount count reached, "
2312 "running e2fsck is recommended");
2313 else if (le32_to_cpu(es->s_checkinterval) &&
2314 (ext4_get_tstamp(es, s_lastcheck) +
2315 le32_to_cpu(es->s_checkinterval) <= ktime_get_real_seconds()))
2316 ext4_msg(sb, KERN_WARNING,
2317 "warning: checktime reached, "
2318 "running e2fsck is recommended");
2319 if (!sbi->s_journal)
2320 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
2321 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
2322 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
2323 le16_add_cpu(&es->s_mnt_count, 1);
2324 ext4_update_tstamp(es, s_mtime);
2325 if (sbi->s_journal)
2326 ext4_set_feature_journal_needs_recovery(sb);
2327
2328 err = ext4_commit_super(sb, 1);
2329 done:
2330 if (test_opt(sb, DEBUG))
2331 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
2332 "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
2333 sb->s_blocksize,
2334 sbi->s_groups_count,
2335 EXT4_BLOCKS_PER_GROUP(sb),
2336 EXT4_INODES_PER_GROUP(sb),
2337 sbi->s_mount_opt, sbi->s_mount_opt2);
2338
2339 cleancache_init_fs(sb);
2340 return err;
2341 }
2342
2343 int ext4_alloc_flex_bg_array(struct super_block *sb, ext4_group_t ngroup)
2344 {
2345 struct ext4_sb_info *sbi = EXT4_SB(sb);
2346 struct flex_groups **old_groups, **new_groups;
2347 int size, i, j;
2348
2349 if (!sbi->s_log_groups_per_flex)
2350 return 0;
2351
2352 size = ext4_flex_group(sbi, ngroup - 1) + 1;
2353 if (size <= sbi->s_flex_groups_allocated)
2354 return 0;
2355
2356 new_groups = kvzalloc(roundup_pow_of_two(size *
2357 sizeof(*sbi->s_flex_groups)), GFP_KERNEL);
2358 if (!new_groups) {
2359 ext4_msg(sb, KERN_ERR,
2360 "not enough memory for %d flex group pointers", size);
2361 return -ENOMEM;
2362 }
2363 for (i = sbi->s_flex_groups_allocated; i < size; i++) {
2364 new_groups[i] = kvzalloc(roundup_pow_of_two(
2365 sizeof(struct flex_groups)),
2366 GFP_KERNEL);
2367 if (!new_groups[i]) {
2368 for (j = sbi->s_flex_groups_allocated; j < i; j++)
2369 kvfree(new_groups[j]);
2370 kvfree(new_groups);
2371 ext4_msg(sb, KERN_ERR,
2372 "not enough memory for %d flex groups", size);
2373 return -ENOMEM;
2374 }
2375 }
2376 rcu_read_lock();
2377 old_groups = rcu_dereference(sbi->s_flex_groups);
2378 if (old_groups)
2379 memcpy(new_groups, old_groups,
2380 (sbi->s_flex_groups_allocated *
2381 sizeof(struct flex_groups *)));
2382 rcu_read_unlock();
2383 rcu_assign_pointer(sbi->s_flex_groups, new_groups);
2384 sbi->s_flex_groups_allocated = size;
2385 if (old_groups)
2386 ext4_kvfree_array_rcu(old_groups);
2387 return 0;
2388 }
2389
2390 static int ext4_fill_flex_info(struct super_block *sb)
2391 {
2392 struct ext4_sb_info *sbi = EXT4_SB(sb);
2393 struct ext4_group_desc *gdp = NULL;
2394 struct flex_groups *fg;
2395 ext4_group_t flex_group;
2396 int i, err;
2397
2398 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
2399 if (sbi->s_log_groups_per_flex < 1 || sbi->s_log_groups_per_flex > 31) {
2400 sbi->s_log_groups_per_flex = 0;
2401 return 1;
2402 }
2403
2404 err = ext4_alloc_flex_bg_array(sb, sbi->s_groups_count);
2405 if (err)
2406 goto failed;
2407
2408 for (i = 0; i < sbi->s_groups_count; i++) {
2409 gdp = ext4_get_group_desc(sb, i, NULL);
2410
2411 flex_group = ext4_flex_group(sbi, i);
2412 fg = sbi_array_rcu_deref(sbi, s_flex_groups, flex_group);
2413 atomic_add(ext4_free_inodes_count(sb, gdp), &fg->free_inodes);
2414 atomic64_add(ext4_free_group_clusters(sb, gdp),
2415 &fg->free_clusters);
2416 atomic_add(ext4_used_dirs_count(sb, gdp), &fg->used_dirs);
2417 }
2418
2419 return 1;
2420 failed:
2421 return 0;
2422 }
2423
2424 static __le16 ext4_group_desc_csum(struct super_block *sb, __u32 block_group,
2425 struct ext4_group_desc *gdp)
2426 {
2427 int offset = offsetof(struct ext4_group_desc, bg_checksum);
2428 __u16 crc = 0;
2429 __le32 le_group = cpu_to_le32(block_group);
2430 struct ext4_sb_info *sbi = EXT4_SB(sb);
2431
2432 if (ext4_has_metadata_csum(sbi->s_sb)) {
2433
2434 __u32 csum32;
2435 __u16 dummy_csum = 0;
2436
2437 csum32 = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&le_group,
2438 sizeof(le_group));
2439 csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp, offset);
2440 csum32 = ext4_chksum(sbi, csum32, (__u8 *)&dummy_csum,
2441 sizeof(dummy_csum));
2442 offset += sizeof(dummy_csum);
2443 if (offset < sbi->s_desc_size)
2444 csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp + offset,
2445 sbi->s_desc_size - offset);
2446
2447 crc = csum32 & 0xFFFF;
2448 goto out;
2449 }
2450
2451
2452 if (!ext4_has_feature_gdt_csum(sb))
2453 return 0;
2454
2455 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
2456 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
2457 crc = crc16(crc, (__u8 *)gdp, offset);
2458 offset += sizeof(gdp->bg_checksum);
2459
2460 if (ext4_has_feature_64bit(sb) &&
2461 offset < le16_to_cpu(sbi->s_es->s_desc_size))
2462 crc = crc16(crc, (__u8 *)gdp + offset,
2463 le16_to_cpu(sbi->s_es->s_desc_size) -
2464 offset);
2465
2466 out:
2467 return cpu_to_le16(crc);
2468 }
2469
2470 int ext4_group_desc_csum_verify(struct super_block *sb, __u32 block_group,
2471 struct ext4_group_desc *gdp)
2472 {
2473 if (ext4_has_group_desc_csum(sb) &&
2474 (gdp->bg_checksum != ext4_group_desc_csum(sb, block_group, gdp)))
2475 return 0;
2476
2477 return 1;
2478 }
2479
2480 void ext4_group_desc_csum_set(struct super_block *sb, __u32 block_group,
2481 struct ext4_group_desc *gdp)
2482 {
2483 if (!ext4_has_group_desc_csum(sb))
2484 return;
2485 gdp->bg_checksum = ext4_group_desc_csum(sb, block_group, gdp);
2486 }
2487
2488
2489 static int ext4_check_descriptors(struct super_block *sb,
2490 ext4_fsblk_t sb_block,
2491 ext4_group_t *first_not_zeroed)
2492 {
2493 struct ext4_sb_info *sbi = EXT4_SB(sb);
2494 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
2495 ext4_fsblk_t last_block;
2496 ext4_fsblk_t last_bg_block = sb_block + ext4_bg_num_gdb(sb, 0);
2497 ext4_fsblk_t block_bitmap;
2498 ext4_fsblk_t inode_bitmap;
2499 ext4_fsblk_t inode_table;
2500 int flexbg_flag = 0;
2501 ext4_group_t i, grp = sbi->s_groups_count;
2502
2503 if (ext4_has_feature_flex_bg(sb))
2504 flexbg_flag = 1;
2505
2506 ext4_debug("Checking group descriptors");
2507
2508 for (i = 0; i < sbi->s_groups_count; i++) {
2509 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
2510
2511 if (i == sbi->s_groups_count - 1 || flexbg_flag)
2512 last_block = ext4_blocks_count(sbi->s_es) - 1;
2513 else
2514 last_block = first_block +
2515 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
2516
2517 if ((grp == sbi->s_groups_count) &&
2518 !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2519 grp = i;
2520
2521 block_bitmap = ext4_block_bitmap(sb, gdp);
2522 if (block_bitmap == sb_block) {
2523 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2524 "Block bitmap for group %u overlaps "
2525 "superblock", i);
2526 if (!sb_rdonly(sb))
2527 return 0;
2528 }
2529 if (block_bitmap >= sb_block + 1 &&
2530 block_bitmap <= last_bg_block) {
2531 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2532 "Block bitmap for group %u overlaps "
2533 "block group descriptors", i);
2534 if (!sb_rdonly(sb))
2535 return 0;
2536 }
2537 if (block_bitmap < first_block || block_bitmap > last_block) {
2538 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2539 "Block bitmap for group %u not in group "
2540 "(block %llu)!", i, block_bitmap);
2541 return 0;
2542 }
2543 inode_bitmap = ext4_inode_bitmap(sb, gdp);
2544 if (inode_bitmap == sb_block) {
2545 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2546 "Inode bitmap for group %u overlaps "
2547 "superblock", i);
2548 if (!sb_rdonly(sb))
2549 return 0;
2550 }
2551 if (inode_bitmap >= sb_block + 1 &&
2552 inode_bitmap <= last_bg_block) {
2553 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2554 "Inode bitmap for group %u overlaps "
2555 "block group descriptors", i);
2556 if (!sb_rdonly(sb))
2557 return 0;
2558 }
2559 if (inode_bitmap < first_block || inode_bitmap > last_block) {
2560 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2561 "Inode bitmap for group %u not in group "
2562 "(block %llu)!", i, inode_bitmap);
2563 return 0;
2564 }
2565 inode_table = ext4_inode_table(sb, gdp);
2566 if (inode_table == sb_block) {
2567 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2568 "Inode table for group %u overlaps "
2569 "superblock", i);
2570 if (!sb_rdonly(sb))
2571 return 0;
2572 }
2573 if (inode_table >= sb_block + 1 &&
2574 inode_table <= last_bg_block) {
2575 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2576 "Inode table for group %u overlaps "
2577 "block group descriptors", i);
2578 if (!sb_rdonly(sb))
2579 return 0;
2580 }
2581 if (inode_table < first_block ||
2582 inode_table + sbi->s_itb_per_group - 1 > last_block) {
2583 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2584 "Inode table for group %u not in group "
2585 "(block %llu)!", i, inode_table);
2586 return 0;
2587 }
2588 ext4_lock_group(sb, i);
2589 if (!ext4_group_desc_csum_verify(sb, i, gdp)) {
2590 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2591 "Checksum for group %u failed (%u!=%u)",
2592 i, le16_to_cpu(ext4_group_desc_csum(sb, i,
2593 gdp)), le16_to_cpu(gdp->bg_checksum));
2594 if (!sb_rdonly(sb)) {
2595 ext4_unlock_group(sb, i);
2596 return 0;
2597 }
2598 }
2599 ext4_unlock_group(sb, i);
2600 if (!flexbg_flag)
2601 first_block += EXT4_BLOCKS_PER_GROUP(sb);
2602 }
2603 if (NULL != first_not_zeroed)
2604 *first_not_zeroed = grp;
2605 return 1;
2606 }
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625 static void ext4_orphan_cleanup(struct super_block *sb,
2626 struct ext4_super_block *es)
2627 {
2628 unsigned int s_flags = sb->s_flags;
2629 int ret, nr_orphans = 0, nr_truncates = 0;
2630 #ifdef CONFIG_QUOTA
2631 int quota_update = 0;
2632 int i;
2633 #endif
2634 if (!es->s_last_orphan) {
2635 jbd_debug(4, "no orphan inodes to clean up\n");
2636 return;
2637 }
2638
2639 if (bdev_read_only(sb->s_bdev)) {
2640 ext4_msg(sb, KERN_ERR, "write access "
2641 "unavailable, skipping orphan cleanup");
2642 return;
2643 }
2644
2645
2646 if (!ext4_feature_set_ok(sb, 0)) {
2647 ext4_msg(sb, KERN_INFO, "Skipping orphan cleanup due to "
2648 "unknown ROCOMPAT features");
2649 return;
2650 }
2651
2652 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
2653
2654 if (es->s_last_orphan && !(s_flags & SB_RDONLY)) {
2655 ext4_msg(sb, KERN_INFO, "Errors on filesystem, "
2656 "clearing orphan list.\n");
2657 es->s_last_orphan = 0;
2658 }
2659 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2660 return;
2661 }
2662
2663 if (s_flags & SB_RDONLY) {
2664 ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
2665 sb->s_flags &= ~SB_RDONLY;
2666 }
2667 #ifdef CONFIG_QUOTA
2668
2669 sb->s_flags |= SB_ACTIVE;
2670
2671
2672
2673
2674
2675 if (ext4_has_feature_quota(sb) && (s_flags & SB_RDONLY)) {
2676 int ret = ext4_enable_quotas(sb);
2677
2678 if (!ret)
2679 quota_update = 1;
2680 else
2681 ext4_msg(sb, KERN_ERR,
2682 "Cannot turn on quotas: error %d", ret);
2683 }
2684
2685
2686 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
2687 if (EXT4_SB(sb)->s_qf_names[i]) {
2688 int ret = ext4_quota_on_mount(sb, i);
2689
2690 if (!ret)
2691 quota_update = 1;
2692 else
2693 ext4_msg(sb, KERN_ERR,
2694 "Cannot turn on journaled "
2695 "quota: type %d: error %d", i, ret);
2696 }
2697 }
2698 #endif
2699
2700 while (es->s_last_orphan) {
2701 struct inode *inode;
2702
2703
2704
2705
2706
2707 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
2708 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2709 es->s_last_orphan = 0;
2710 break;
2711 }
2712
2713 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
2714 if (IS_ERR(inode)) {
2715 es->s_last_orphan = 0;
2716 break;
2717 }
2718
2719 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
2720 dquot_initialize(inode);
2721 if (inode->i_nlink) {
2722 if (test_opt(sb, DEBUG))
2723 ext4_msg(sb, KERN_DEBUG,
2724 "%s: truncating inode %lu to %lld bytes",
2725 __func__, inode->i_ino, inode->i_size);
2726 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
2727 inode->i_ino, inode->i_size);
2728 inode_lock(inode);
2729 truncate_inode_pages(inode->i_mapping, inode->i_size);
2730 ret = ext4_truncate(inode);
2731 if (ret)
2732 ext4_std_error(inode->i_sb, ret);
2733 inode_unlock(inode);
2734 nr_truncates++;
2735 } else {
2736 if (test_opt(sb, DEBUG))
2737 ext4_msg(sb, KERN_DEBUG,
2738 "%s: deleting unreferenced inode %lu",
2739 __func__, inode->i_ino);
2740 jbd_debug(2, "deleting unreferenced inode %lu\n",
2741 inode->i_ino);
2742 nr_orphans++;
2743 }
2744 iput(inode);
2745 }
2746
2747 #define PLURAL(x) (x), ((x) == 1) ? "" : "s"
2748
2749 if (nr_orphans)
2750 ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
2751 PLURAL(nr_orphans));
2752 if (nr_truncates)
2753 ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
2754 PLURAL(nr_truncates));
2755 #ifdef CONFIG_QUOTA
2756
2757 if (quota_update) {
2758 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
2759 if (sb_dqopt(sb)->files[i])
2760 dquot_quota_off(sb, i);
2761 }
2762 }
2763 #endif
2764 sb->s_flags = s_flags;
2765 }
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782 static loff_t ext4_max_size(int blkbits, int has_huge_files)
2783 {
2784 loff_t res;
2785 loff_t upper_limit = MAX_LFS_FILESIZE;
2786
2787 BUILD_BUG_ON(sizeof(blkcnt_t) < sizeof(u64));
2788
2789 if (!has_huge_files) {
2790 upper_limit = (1LL << 32) - 1;
2791
2792
2793 upper_limit >>= (blkbits - 9);
2794 upper_limit <<= blkbits;
2795 }
2796
2797
2798
2799
2800
2801
2802 res = (1LL << 32) - 1;
2803 res <<= blkbits;
2804
2805
2806 if (res > upper_limit)
2807 res = upper_limit;
2808
2809 return res;
2810 }
2811
2812
2813
2814
2815
2816
2817 static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
2818 {
2819 loff_t res = EXT4_NDIR_BLOCKS;
2820 int meta_blocks;
2821 loff_t upper_limit;
2822
2823
2824
2825
2826
2827
2828
2829
2830 if (!has_huge_files) {
2831
2832
2833
2834
2835
2836 upper_limit = (1LL << 32) - 1;
2837
2838
2839 upper_limit >>= (bits - 9);
2840
2841 } else {
2842
2843
2844
2845
2846
2847
2848 upper_limit = (1LL << 48) - 1;
2849
2850 }
2851
2852
2853 meta_blocks = 1;
2854
2855 meta_blocks += 1 + (1LL << (bits-2));
2856
2857 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
2858
2859 upper_limit -= meta_blocks;
2860 upper_limit <<= bits;
2861
2862 res += 1LL << (bits-2);
2863 res += 1LL << (2*(bits-2));
2864 res += 1LL << (3*(bits-2));
2865 res <<= bits;
2866 if (res > upper_limit)
2867 res = upper_limit;
2868
2869 if (res > MAX_LFS_FILESIZE)
2870 res = MAX_LFS_FILESIZE;
2871
2872 return res;
2873 }
2874
2875 static ext4_fsblk_t descriptor_loc(struct super_block *sb,
2876 ext4_fsblk_t logical_sb_block, int nr)
2877 {
2878 struct ext4_sb_info *sbi = EXT4_SB(sb);
2879 ext4_group_t bg, first_meta_bg;
2880 int has_super = 0;
2881
2882 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
2883
2884 if (!ext4_has_feature_meta_bg(sb) || nr < first_meta_bg)
2885 return logical_sb_block + nr + 1;
2886 bg = sbi->s_desc_per_block * nr;
2887 if (ext4_bg_has_super(sb, bg))
2888 has_super = 1;
2889
2890
2891
2892
2893
2894
2895
2896 if (sb->s_blocksize == 1024 && nr == 0 &&
2897 le32_to_cpu(sbi->s_es->s_first_data_block) == 0)
2898 has_super++;
2899
2900 return (has_super + ext4_group_first_block_no(sb, bg));
2901 }
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914 static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
2915 {
2916 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
2917 unsigned long stripe_width =
2918 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
2919 int ret;
2920
2921 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
2922 ret = sbi->s_stripe;
2923 else if (stripe_width && stripe_width <= sbi->s_blocks_per_group)
2924 ret = stripe_width;
2925 else if (stride && stride <= sbi->s_blocks_per_group)
2926 ret = stride;
2927 else
2928 ret = 0;
2929
2930
2931
2932
2933
2934 if (ret <= 1)
2935 ret = 0;
2936
2937 return ret;
2938 }
2939
2940
2941
2942
2943
2944
2945
2946 static int ext4_feature_set_ok(struct super_block *sb, int readonly)
2947 {
2948 if (ext4_has_unknown_ext4_incompat_features(sb)) {
2949 ext4_msg(sb, KERN_ERR,
2950 "Couldn't mount because of "
2951 "unsupported optional features (%x)",
2952 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
2953 ~EXT4_FEATURE_INCOMPAT_SUPP));
2954 return 0;
2955 }
2956
2957 #ifndef CONFIG_UNICODE
2958 if (ext4_has_feature_casefold(sb)) {
2959 ext4_msg(sb, KERN_ERR,
2960 "Filesystem with casefold feature cannot be "
2961 "mounted without CONFIG_UNICODE");
2962 return 0;
2963 }
2964 #endif
2965
2966 if (readonly)
2967 return 1;
2968
2969 if (ext4_has_feature_readonly(sb)) {
2970 ext4_msg(sb, KERN_INFO, "filesystem is read-only");
2971 sb->s_flags |= SB_RDONLY;
2972 return 1;
2973 }
2974
2975
2976 if (ext4_has_unknown_ext4_ro_compat_features(sb)) {
2977 ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of "
2978 "unsupported optional features (%x)",
2979 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
2980 ~EXT4_FEATURE_RO_COMPAT_SUPP));
2981 return 0;
2982 }
2983 if (ext4_has_feature_bigalloc(sb) && !ext4_has_feature_extents(sb)) {
2984 ext4_msg(sb, KERN_ERR,
2985 "Can't support bigalloc feature without "
2986 "extents feature\n");
2987 return 0;
2988 }
2989
2990 #if !IS_ENABLED(CONFIG_QUOTA) || !IS_ENABLED(CONFIG_QFMT_V2)
2991 if (!readonly && (ext4_has_feature_quota(sb) ||
2992 ext4_has_feature_project(sb))) {
2993 ext4_msg(sb, KERN_ERR,
2994 "The kernel was not built with CONFIG_QUOTA and CONFIG_QFMT_V2");
2995 return 0;
2996 }
2997 #endif
2998 return 1;
2999 }
3000
3001
3002
3003
3004
3005 static void print_daily_error_info(struct timer_list *t)
3006 {
3007 struct ext4_sb_info *sbi = from_timer(sbi, t, s_err_report);
3008 struct super_block *sb = sbi->s_sb;
3009 struct ext4_super_block *es = sbi->s_es;
3010
3011 if (es->s_error_count)
3012
3013 ext4_msg(sb, KERN_NOTICE, "error count since last fsck: %u",
3014 le32_to_cpu(es->s_error_count));
3015 if (es->s_first_error_time) {
3016 printk(KERN_NOTICE "EXT4-fs (%s): initial error at time %llu: %.*s:%d",
3017 sb->s_id,
3018 ext4_get_tstamp(es, s_first_error_time),
3019 (int) sizeof(es->s_first_error_func),
3020 es->s_first_error_func,
3021 le32_to_cpu(es->s_first_error_line));
3022 if (es->s_first_error_ino)
3023 printk(KERN_CONT ": inode %u",
3024 le32_to_cpu(es->s_first_error_ino));
3025 if (es->s_first_error_block)
3026 printk(KERN_CONT ": block %llu", (unsigned long long)
3027 le64_to_cpu(es->s_first_error_block));
3028 printk(KERN_CONT "\n");
3029 }
3030 if (es->s_last_error_time) {
3031 printk(KERN_NOTICE "EXT4-fs (%s): last error at time %llu: %.*s:%d",
3032 sb->s_id,
3033 ext4_get_tstamp(es, s_last_error_time),
3034 (int) sizeof(es->s_last_error_func),
3035 es->s_last_error_func,
3036 le32_to_cpu(es->s_last_error_line));
3037 if (es->s_last_error_ino)
3038 printk(KERN_CONT ": inode %u",
3039 le32_to_cpu(es->s_last_error_ino));
3040 if (es->s_last_error_block)
3041 printk(KERN_CONT ": block %llu", (unsigned long long)
3042 le64_to_cpu(es->s_last_error_block));
3043 printk(KERN_CONT "\n");
3044 }
3045 mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ);
3046 }
3047
3048
3049 static int ext4_run_li_request(struct ext4_li_request *elr)
3050 {
3051 struct ext4_group_desc *gdp = NULL;
3052 ext4_group_t group, ngroups;
3053 struct super_block *sb;
3054 unsigned long timeout = 0;
3055 int ret = 0;
3056
3057 sb = elr->lr_super;
3058 ngroups = EXT4_SB(sb)->s_groups_count;
3059
3060 for (group = elr->lr_next_group; group < ngroups; group++) {
3061 gdp = ext4_get_group_desc(sb, group, NULL);
3062 if (!gdp) {
3063 ret = 1;
3064 break;
3065 }
3066
3067 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
3068 break;
3069 }
3070
3071 if (group >= ngroups)
3072 ret = 1;
3073
3074 if (!ret) {
3075 timeout = jiffies;
3076 ret = ext4_init_inode_table(sb, group,
3077 elr->lr_timeout ? 0 : 1);
3078 if (elr->lr_timeout == 0) {
3079 timeout = (jiffies - timeout) *
3080 elr->lr_sbi->s_li_wait_mult;
3081 elr->lr_timeout = timeout;
3082 }
3083 elr->lr_next_sched = jiffies + elr->lr_timeout;
3084 elr->lr_next_group = group + 1;
3085 }
3086 return ret;
3087 }
3088
3089
3090
3091
3092
3093 static void ext4_remove_li_request(struct ext4_li_request *elr)
3094 {
3095 struct ext4_sb_info *sbi;
3096
3097 if (!elr)
3098 return;
3099
3100 sbi = elr->lr_sbi;
3101
3102 list_del(&elr->lr_request);
3103 sbi->s_li_request = NULL;
3104 kfree(elr);
3105 }
3106
3107 static void ext4_unregister_li_request(struct super_block *sb)
3108 {
3109 mutex_lock(&ext4_li_mtx);
3110 if (!ext4_li_info) {
3111 mutex_unlock(&ext4_li_mtx);
3112 return;
3113 }
3114
3115 mutex_lock(&ext4_li_info->li_list_mtx);
3116 ext4_remove_li_request(EXT4_SB(sb)->s_li_request);
3117 mutex_unlock(&ext4_li_info->li_list_mtx);
3118 mutex_unlock(&ext4_li_mtx);
3119 }
3120
3121 static struct task_struct *ext4_lazyinit_task;
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132 static int ext4_lazyinit_thread(void *arg)
3133 {
3134 struct ext4_lazy_init *eli = (struct ext4_lazy_init *)arg;
3135 struct list_head *pos, *n;
3136 struct ext4_li_request *elr;
3137 unsigned long next_wakeup, cur;
3138
3139 BUG_ON(NULL == eli);
3140
3141 cont_thread:
3142 while (true) {
3143 next_wakeup = MAX_JIFFY_OFFSET;
3144
3145 mutex_lock(&eli->li_list_mtx);
3146 if (list_empty(&eli->li_request_list)) {
3147 mutex_unlock(&eli->li_list_mtx);
3148 goto exit_thread;
3149 }
3150 list_for_each_safe(pos, n, &eli->li_request_list) {
3151 int err = 0;
3152 int progress = 0;
3153 elr = list_entry(pos, struct ext4_li_request,
3154 lr_request);
3155
3156 if (time_before(jiffies, elr->lr_next_sched)) {
3157 if (time_before(elr->lr_next_sched, next_wakeup))
3158 next_wakeup = elr->lr_next_sched;
3159 continue;
3160 }
3161 if (down_read_trylock(&elr->lr_super->s_umount)) {
3162 if (sb_start_write_trylock(elr->lr_super)) {
3163 progress = 1;
3164
3165
3166
3167
3168
3169 mutex_unlock(&eli->li_list_mtx);
3170 err = ext4_run_li_request(elr);
3171 sb_end_write(elr->lr_super);
3172 mutex_lock(&eli->li_list_mtx);
3173 n = pos->next;
3174 }
3175 up_read((&elr->lr_super->s_umount));
3176 }
3177
3178 if (err) {
3179 ext4_remove_li_request(elr);
3180 continue;
3181 }
3182 if (!progress) {
3183 elr->lr_next_sched = jiffies +
3184 (prandom_u32()
3185 % (EXT4_DEF_LI_MAX_START_DELAY * HZ));
3186 }
3187 if (time_before(elr->lr_next_sched, next_wakeup))
3188 next_wakeup = elr->lr_next_sched;
3189 }
3190 mutex_unlock(&eli->li_list_mtx);
3191
3192 try_to_freeze();
3193
3194 cur = jiffies;
3195 if ((time_after_eq(cur, next_wakeup)) ||
3196 (MAX_JIFFY_OFFSET == next_wakeup)) {
3197 cond_resched();
3198 continue;
3199 }
3200
3201 schedule_timeout_interruptible(next_wakeup - cur);
3202
3203 if (kthread_should_stop()) {
3204 ext4_clear_request_list();
3205 goto exit_thread;
3206 }
3207 }
3208
3209 exit_thread:
3210
3211
3212
3213
3214
3215
3216
3217
3218 mutex_lock(&ext4_li_mtx);
3219 mutex_lock(&eli->li_list_mtx);
3220 if (!list_empty(&eli->li_request_list)) {
3221 mutex_unlock(&eli->li_list_mtx);
3222 mutex_unlock(&ext4_li_mtx);
3223 goto cont_thread;
3224 }
3225 mutex_unlock(&eli->li_list_mtx);
3226 kfree(ext4_li_info);
3227 ext4_li_info = NULL;
3228 mutex_unlock(&ext4_li_mtx);
3229
3230 return 0;
3231 }
3232
3233 static void ext4_clear_request_list(void)
3234 {
3235 struct list_head *pos, *n;
3236 struct ext4_li_request *elr;
3237
3238 mutex_lock(&ext4_li_info->li_list_mtx);
3239 list_for_each_safe(pos, n, &ext4_li_info->li_request_list) {
3240 elr = list_entry(pos, struct ext4_li_request,
3241 lr_request);
3242 ext4_remove_li_request(elr);
3243 }
3244 mutex_unlock(&ext4_li_info->li_list_mtx);
3245 }
3246
3247 static int ext4_run_lazyinit_thread(void)
3248 {
3249 ext4_lazyinit_task = kthread_run(ext4_lazyinit_thread,
3250 ext4_li_info, "ext4lazyinit");
3251 if (IS_ERR(ext4_lazyinit_task)) {
3252 int err = PTR_ERR(ext4_lazyinit_task);
3253 ext4_clear_request_list();
3254 kfree(ext4_li_info);
3255 ext4_li_info = NULL;
3256 printk(KERN_CRIT "EXT4-fs: error %d creating inode table "
3257 "initialization thread\n",
3258 err);
3259 return err;
3260 }
3261 ext4_li_info->li_state |= EXT4_LAZYINIT_RUNNING;
3262 return 0;
3263 }
3264
3265
3266
3267
3268
3269
3270
3271 static ext4_group_t ext4_has_uninit_itable(struct super_block *sb)
3272 {
3273 ext4_group_t group, ngroups = EXT4_SB(sb)->s_groups_count;
3274 struct ext4_group_desc *gdp = NULL;
3275
3276 if (!ext4_has_group_desc_csum(sb))
3277 return ngroups;
3278
3279 for (group = 0; group < ngroups; group++) {
3280 gdp = ext4_get_group_desc(sb, group, NULL);
3281 if (!gdp)
3282 continue;
3283
3284 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
3285 break;
3286 }
3287
3288 return group;
3289 }
3290
3291 static int ext4_li_info_new(void)
3292 {
3293 struct ext4_lazy_init *eli = NULL;
3294
3295 eli = kzalloc(sizeof(*eli), GFP_KERNEL);
3296 if (!eli)
3297 return -ENOMEM;
3298
3299 INIT_LIST_HEAD(&eli->li_request_list);
3300 mutex_init(&eli->li_list_mtx);
3301
3302 eli->li_state |= EXT4_LAZYINIT_QUIT;
3303
3304 ext4_li_info = eli;
3305
3306 return 0;
3307 }
3308
3309 static struct ext4_li_request *ext4_li_request_new(struct super_block *sb,
3310 ext4_group_t start)
3311 {
3312 struct ext4_sb_info *sbi = EXT4_SB(sb);
3313 struct ext4_li_request *elr;
3314
3315 elr = kzalloc(sizeof(*elr), GFP_KERNEL);
3316 if (!elr)
3317 return NULL;
3318
3319 elr->lr_super = sb;
3320 elr->lr_sbi = sbi;
3321 elr->lr_next_group = start;
3322
3323
3324
3325
3326
3327
3328 elr->lr_next_sched = jiffies + (prandom_u32() %
3329 (EXT4_DEF_LI_MAX_START_DELAY * HZ));
3330 return elr;
3331 }
3332
3333 int ext4_register_li_request(struct super_block *sb,
3334 ext4_group_t first_not_zeroed)
3335 {
3336 struct ext4_sb_info *sbi = EXT4_SB(sb);
3337 struct ext4_li_request *elr = NULL;
3338 ext4_group_t ngroups = sbi->s_groups_count;
3339 int ret = 0;
3340
3341 mutex_lock(&ext4_li_mtx);
3342 if (sbi->s_li_request != NULL) {
3343
3344
3345
3346
3347 sbi->s_li_request->lr_timeout = 0;
3348 goto out;
3349 }
3350
3351 if (first_not_zeroed == ngroups || sb_rdonly(sb) ||
3352 !test_opt(sb, INIT_INODE_TABLE))
3353 goto out;
3354
3355 elr = ext4_li_request_new(sb, first_not_zeroed);
3356 if (!elr) {
3357 ret = -ENOMEM;
3358 goto out;
3359 }
3360
3361 if (NULL == ext4_li_info) {
3362 ret = ext4_li_info_new();
3363 if (ret)
3364 goto out;
3365 }
3366
3367 mutex_lock(&ext4_li_info->li_list_mtx);
3368 list_add(&elr->lr_request, &ext4_li_info->li_request_list);
3369 mutex_unlock(&ext4_li_info->li_list_mtx);
3370
3371 sbi->s_li_request = elr;
3372
3373
3374
3375
3376
3377 elr = NULL;
3378
3379 if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) {
3380 ret = ext4_run_lazyinit_thread();
3381 if (ret)
3382 goto out;
3383 }
3384 out:
3385 mutex_unlock(&ext4_li_mtx);
3386 if (ret)
3387 kfree(elr);
3388 return ret;
3389 }
3390
3391
3392
3393
3394
3395 static void ext4_destroy_lazyinit_thread(void)
3396 {
3397
3398
3399
3400
3401 if (!ext4_li_info || !ext4_lazyinit_task)
3402 return;
3403
3404 kthread_stop(ext4_lazyinit_task);
3405 }
3406
3407 static int set_journal_csum_feature_set(struct super_block *sb)
3408 {
3409 int ret = 1;
3410 int compat, incompat;
3411 struct ext4_sb_info *sbi = EXT4_SB(sb);
3412
3413 if (ext4_has_metadata_csum(sb)) {
3414
3415 compat = 0;
3416 incompat = JBD2_FEATURE_INCOMPAT_CSUM_V3;
3417 } else {
3418
3419 compat = JBD2_FEATURE_COMPAT_CHECKSUM;
3420 incompat = 0;
3421 }
3422
3423 jbd2_journal_clear_features(sbi->s_journal,
3424 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
3425 JBD2_FEATURE_INCOMPAT_CSUM_V3 |
3426 JBD2_FEATURE_INCOMPAT_CSUM_V2);
3427 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
3428 ret = jbd2_journal_set_features(sbi->s_journal,
3429 compat, 0,
3430 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT |
3431 incompat);
3432 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
3433 ret = jbd2_journal_set_features(sbi->s_journal,
3434 compat, 0,
3435 incompat);
3436 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
3437 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
3438 } else {
3439 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
3440 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
3441 }
3442
3443 return ret;
3444 }
3445
3446
3447
3448
3449
3450
3451
3452
3453
3454
3455
3456
3457
3458
3459
3460
3461 static int count_overhead(struct super_block *sb, ext4_group_t grp,
3462 char *buf)
3463 {
3464 struct ext4_sb_info *sbi = EXT4_SB(sb);
3465 struct ext4_group_desc *gdp;
3466 ext4_fsblk_t first_block, last_block, b;
3467 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3468 int s, j, count = 0;
3469
3470 if (!ext4_has_feature_bigalloc(sb))
3471 return (ext4_bg_has_super(sb, grp) + ext4_bg_num_gdb(sb, grp) +
3472 sbi->s_itb_per_group + 2);
3473
3474 first_block = le32_to_cpu(sbi->s_es->s_first_data_block) +
3475 (grp * EXT4_BLOCKS_PER_GROUP(sb));
3476 last_block = first_block + EXT4_BLOCKS_PER_GROUP(sb) - 1;
3477 for (i = 0; i < ngroups; i++) {
3478 gdp = ext4_get_group_desc(sb, i, NULL);
3479 b = ext4_block_bitmap(sb, gdp);
3480 if (b >= first_block && b <= last_block) {
3481 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3482 count++;
3483 }
3484 b = ext4_inode_bitmap(sb, gdp);
3485 if (b >= first_block && b <= last_block) {
3486 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3487 count++;
3488 }
3489 b = ext4_inode_table(sb, gdp);
3490 if (b >= first_block && b + sbi->s_itb_per_group <= last_block)
3491 for (j = 0; j < sbi->s_itb_per_group; j++, b++) {
3492 int c = EXT4_B2C(sbi, b - first_block);
3493 ext4_set_bit(c, buf);
3494 count++;
3495 }
3496 if (i != grp)
3497 continue;
3498 s = 0;
3499 if (ext4_bg_has_super(sb, grp)) {
3500 ext4_set_bit(s++, buf);
3501 count++;
3502 }
3503 j = ext4_bg_num_gdb(sb, grp);
3504 if (s + j > EXT4_BLOCKS_PER_GROUP(sb)) {
3505 ext4_error(sb, "Invalid number of block group "
3506 "descriptor blocks: %d", j);
3507 j = EXT4_BLOCKS_PER_GROUP(sb) - s;
3508 }
3509 count += j;
3510 for (; j > 0; j--)
3511 ext4_set_bit(EXT4_B2C(sbi, s++), buf);
3512 }
3513 if (!count)
3514 return 0;
3515 return EXT4_CLUSTERS_PER_GROUP(sb) -
3516 ext4_count_free(buf, EXT4_CLUSTERS_PER_GROUP(sb) / 8);
3517 }
3518
3519
3520
3521
3522 int ext4_calculate_overhead(struct super_block *sb)
3523 {
3524 struct ext4_sb_info *sbi = EXT4_SB(sb);
3525 struct ext4_super_block *es = sbi->s_es;
3526 struct inode *j_inode;
3527 unsigned int j_blocks, j_inum = le32_to_cpu(es->s_journal_inum);
3528 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3529 ext4_fsblk_t overhead = 0;
3530 char *buf = (char *) get_zeroed_page(GFP_NOFS);
3531
3532 if (!buf)
3533 return -ENOMEM;
3534
3535
3536
3537
3538
3539
3540
3541
3542
3543
3544 overhead = EXT4_B2C(sbi, le32_to_cpu(es->s_first_data_block));
3545
3546
3547
3548
3549 for (i = 0; i < ngroups; i++) {
3550 int blks;
3551
3552 blks = count_overhead(sb, i, buf);
3553 overhead += blks;
3554 if (blks)
3555 memset(buf, 0, PAGE_SIZE);
3556 cond_resched();
3557 }
3558
3559
3560
3561
3562
3563 if (sbi->s_journal && !sbi->journal_bdev)
3564 overhead += EXT4_NUM_B2C(sbi, sbi->s_journal->j_maxlen);
3565 else if (ext4_has_feature_journal(sb) && !sbi->s_journal && j_inum) {
3566
3567 j_inode = ext4_get_journal_inode(sb, j_inum);
3568 if (j_inode) {
3569 j_blocks = j_inode->i_size >> sb->s_blocksize_bits;
3570 overhead += EXT4_NUM_B2C(sbi, j_blocks);
3571 iput(j_inode);
3572 } else {
3573 ext4_msg(sb, KERN_ERR, "can't get journal size");
3574 }
3575 }
3576 sbi->s_overhead = overhead;
3577 smp_wmb();
3578 free_page((unsigned long) buf);
3579 return 0;
3580 }
3581
3582 static void ext4_set_resv_clusters(struct super_block *sb)
3583 {
3584 ext4_fsblk_t resv_clusters;
3585 struct ext4_sb_info *sbi = EXT4_SB(sb);
3586
3587
3588
3589
3590
3591
3592
3593 if (!ext4_has_feature_extents(sb))
3594 return;
3595
3596
3597
3598
3599
3600
3601
3602
3603 resv_clusters = (ext4_blocks_count(sbi->s_es) >>
3604 sbi->s_cluster_bits);
3605
3606 do_div(resv_clusters, 50);
3607 resv_clusters = min_t(ext4_fsblk_t, resv_clusters, 4096);
3608
3609 atomic64_set(&sbi->s_resv_clusters, resv_clusters);
3610 }
3611
3612 static int ext4_fill_super(struct super_block *sb, void *data, int silent)
3613 {
3614 struct dax_device *dax_dev = fs_dax_get_by_bdev(sb->s_bdev);
3615 char *orig_data = kstrdup(data, GFP_KERNEL);
3616 struct buffer_head *bh, **group_desc;
3617 struct ext4_super_block *es = NULL;
3618 struct ext4_sb_info *sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
3619 struct flex_groups **flex_groups;
3620 ext4_fsblk_t block;
3621 ext4_fsblk_t sb_block = get_sb_block(&data);
3622 ext4_fsblk_t logical_sb_block;
3623 unsigned long offset = 0;
3624 unsigned long journal_devnum = 0;
3625 unsigned long def_mount_opts;
3626 struct inode *root;
3627 const char *descr;
3628 int ret = -ENOMEM;
3629 int blocksize, clustersize;
3630 unsigned int db_count;
3631 unsigned int i;
3632 int needs_recovery, has_huge_files, has_bigalloc;
3633 __u64 blocks_count;
3634 int err = 0;
3635 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
3636 ext4_group_t first_not_zeroed;
3637
3638 if ((data && !orig_data) || !sbi)
3639 goto out_free_base;
3640
3641 sbi->s_daxdev = dax_dev;
3642 sbi->s_blockgroup_lock =
3643 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
3644 if (!sbi->s_blockgroup_lock)
3645 goto out_free_base;
3646
3647 sb->s_fs_info = sbi;
3648 sbi->s_sb = sb;
3649 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
3650 sbi->s_sb_block = sb_block;
3651 if (sb->s_bdev->bd_part)
3652 sbi->s_sectors_written_start =
3653 part_stat_read(sb->s_bdev->bd_part, sectors[STAT_WRITE]);
3654
3655
3656 strreplace(sb->s_id, '/', '!');
3657
3658
3659 ret = -EINVAL;
3660 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
3661 if (!blocksize) {
3662 ext4_msg(sb, KERN_ERR, "unable to set blocksize");
3663 goto out_fail;
3664 }
3665
3666
3667
3668
3669
3670 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
3671 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3672 offset = do_div(logical_sb_block, blocksize);
3673 } else {
3674 logical_sb_block = sb_block;
3675 }
3676
3677 if (!(bh = sb_bread_unmovable(sb, logical_sb_block))) {
3678 ext4_msg(sb, KERN_ERR, "unable to read superblock");
3679 goto out_fail;
3680 }
3681
3682
3683
3684
3685 es = (struct ext4_super_block *) (bh->b_data + offset);
3686 sbi->s_es = es;
3687 sb->s_magic = le16_to_cpu(es->s_magic);
3688 if (sb->s_magic != EXT4_SUPER_MAGIC)
3689 goto cantfind_ext4;
3690 sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
3691
3692
3693 if (ext4_has_feature_metadata_csum(sb) &&
3694 ext4_has_feature_gdt_csum(sb))
3695 ext4_warning(sb, "metadata_csum and uninit_bg are "
3696 "redundant flags; please run fsck.");
3697
3698
3699 if (!ext4_verify_csum_type(sb, es)) {
3700 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3701 "unknown checksum algorithm.");
3702 silent = 1;
3703 goto cantfind_ext4;
3704 }
3705
3706
3707 sbi->s_chksum_driver = crypto_alloc_shash("crc32c", 0, 0);
3708 if (IS_ERR(sbi->s_chksum_driver)) {
3709 ext4_msg(sb, KERN_ERR, "Cannot load crc32c driver.");
3710 ret = PTR_ERR(sbi->s_chksum_driver);
3711 sbi->s_chksum_driver = NULL;
3712 goto failed_mount;
3713 }
3714
3715
3716 if (!ext4_superblock_csum_verify(sb, es)) {
3717 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3718 "invalid superblock checksum. Run e2fsck?");
3719 silent = 1;
3720 ret = -EFSBADCRC;
3721 goto cantfind_ext4;
3722 }
3723
3724
3725 if (ext4_has_feature_csum_seed(sb))
3726 sbi->s_csum_seed = le32_to_cpu(es->s_checksum_seed);
3727 else if (ext4_has_metadata_csum(sb) || ext4_has_feature_ea_inode(sb))
3728 sbi->s_csum_seed = ext4_chksum(sbi, ~0, es->s_uuid,
3729 sizeof(es->s_uuid));
3730
3731
3732 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
3733 set_opt(sb, INIT_INODE_TABLE);
3734 if (def_mount_opts & EXT4_DEFM_DEBUG)
3735 set_opt(sb, DEBUG);
3736 if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
3737 set_opt(sb, GRPID);
3738 if (def_mount_opts & EXT4_DEFM_UID16)
3739 set_opt(sb, NO_UID32);
3740
3741 set_opt(sb, XATTR_USER);
3742 #ifdef CONFIG_EXT4_FS_POSIX_ACL
3743 set_opt(sb, POSIX_ACL);
3744 #endif
3745
3746 if (ext4_has_metadata_csum(sb))
3747 set_opt(sb, JOURNAL_CHECKSUM);
3748
3749 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
3750 set_opt(sb, JOURNAL_DATA);
3751 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
3752 set_opt(sb, ORDERED_DATA);
3753 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
3754 set_opt(sb, WRITEBACK_DATA);
3755
3756 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
3757 set_opt(sb, ERRORS_PANIC);
3758 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
3759 set_opt(sb, ERRORS_CONT);
3760 else
3761 set_opt(sb, ERRORS_RO);
3762
3763 set_opt(sb, BLOCK_VALIDITY);
3764 if (def_mount_opts & EXT4_DEFM_DISCARD)
3765 set_opt(sb, DISCARD);
3766
3767 sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));
3768 sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid));
3769 sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
3770 sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
3771 sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
3772
3773 if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0)
3774 set_opt(sb, BARRIER);
3775
3776
3777
3778
3779
3780 if (!IS_EXT3_SB(sb) && !IS_EXT2_SB(sb) &&
3781 ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0))
3782 set_opt(sb, DELALLOC);
3783
3784
3785
3786
3787
3788 sbi->s_li_wait_mult = EXT4_DEF_LI_WAIT_MULT;
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
3799 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
3800 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
3801 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
3802 } else {
3803 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
3804 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
3805 if (sbi->s_first_ino < EXT4_GOOD_OLD_FIRST_INO) {
3806 ext4_msg(sb, KERN_ERR, "invalid first ino: %u",
3807 sbi->s_first_ino);
3808 goto failed_mount;
3809 }
3810 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
3811 (!is_power_of_2(sbi->s_inode_size)) ||
3812 (sbi->s_inode_size > blocksize)) {
3813 ext4_msg(sb, KERN_ERR,
3814 "unsupported inode size: %d",
3815 sbi->s_inode_size);
3816 ext4_msg(sb, KERN_ERR, "blocksize: %d", blocksize);
3817 goto failed_mount;
3818 }
3819
3820
3821
3822
3823
3824
3825 if (sbi->s_inode_size >= offsetof(struct ext4_inode, i_atime_extra) +
3826 sizeof(((struct ext4_inode *)0)->i_atime_extra)) {
3827 sb->s_time_gran = 1;
3828 sb->s_time_max = EXT4_EXTRA_TIMESTAMP_MAX;
3829 } else {
3830 sb->s_time_gran = NSEC_PER_SEC;
3831 sb->s_time_max = EXT4_NON_EXTRA_TIMESTAMP_MAX;
3832 }
3833 sb->s_time_min = EXT4_TIMESTAMP_MIN;
3834 }
3835 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
3836 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
3837 EXT4_GOOD_OLD_INODE_SIZE;
3838 if (ext4_has_feature_extra_isize(sb)) {
3839 unsigned v, max = (sbi->s_inode_size -
3840 EXT4_GOOD_OLD_INODE_SIZE);
3841
3842 v = le16_to_cpu(es->s_want_extra_isize);
3843 if (v > max) {
3844 ext4_msg(sb, KERN_ERR,
3845 "bad s_want_extra_isize: %d", v);
3846 goto failed_mount;
3847 }
3848 if (sbi->s_want_extra_isize < v)
3849 sbi->s_want_extra_isize = v;
3850
3851 v = le16_to_cpu(es->s_min_extra_isize);
3852 if (v > max) {
3853 ext4_msg(sb, KERN_ERR,
3854 "bad s_min_extra_isize: %d", v);
3855 goto failed_mount;
3856 }
3857 if (sbi->s_want_extra_isize < v)
3858 sbi->s_want_extra_isize = v;
3859 }
3860 }
3861
3862 if (sbi->s_es->s_mount_opts[0]) {
3863 char *s_mount_opts = kstrndup(sbi->s_es->s_mount_opts,
3864 sizeof(sbi->s_es->s_mount_opts),
3865 GFP_KERNEL);
3866 if (!s_mount_opts)
3867 goto failed_mount;
3868 if (!parse_options(s_mount_opts, sb, &journal_devnum,
3869 &journal_ioprio, 0)) {
3870 ext4_msg(sb, KERN_WARNING,
3871 "failed to parse options in superblock: %s",
3872 s_mount_opts);
3873 }
3874 kfree(s_mount_opts);
3875 }
3876 sbi->s_def_mount_opt = sbi->s_mount_opt;
3877 if (!parse_options((char *) data, sb, &journal_devnum,
3878 &journal_ioprio, 0))
3879 goto failed_mount;
3880
3881 #ifdef CONFIG_UNICODE
3882 if (ext4_has_feature_casefold(sb) && !sbi->s_encoding) {
3883 const struct ext4_sb_encodings *encoding_info;
3884 struct unicode_map *encoding;
3885 __u16 encoding_flags;
3886
3887 if (ext4_has_feature_encrypt(sb)) {
3888 ext4_msg(sb, KERN_ERR,
3889 "Can't mount with encoding and encryption");
3890 goto failed_mount;
3891 }
3892
3893 if (ext4_sb_read_encoding(es, &encoding_info,
3894 &encoding_flags)) {
3895 ext4_msg(sb, KERN_ERR,
3896 "Encoding requested by superblock is unknown");
3897 goto failed_mount;
3898 }
3899
3900 encoding = utf8_load(encoding_info->version);
3901 if (IS_ERR(encoding)) {
3902 ext4_msg(sb, KERN_ERR,
3903 "can't mount with superblock charset: %s-%s "
3904 "not supported by the kernel. flags: 0x%x.",
3905 encoding_info->name, encoding_info->version,
3906 encoding_flags);
3907 goto failed_mount;
3908 }
3909 ext4_msg(sb, KERN_INFO,"Using encoding defined by superblock: "
3910 "%s-%s with flags 0x%hx", encoding_info->name,
3911 encoding_info->version?:"\b", encoding_flags);
3912
3913 sbi->s_encoding = encoding;
3914 sbi->s_encoding_flags = encoding_flags;
3915 }
3916 #endif
3917
3918 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
3919 printk_once(KERN_WARNING "EXT4-fs: Warning: mounting "
3920 "with data=journal disables delayed "
3921 "allocation and O_DIRECT support!\n");
3922 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
3923 ext4_msg(sb, KERN_ERR, "can't mount with "
3924 "both data=journal and delalloc");
3925 goto failed_mount;
3926 }
3927 if (test_opt(sb, DIOREAD_NOLOCK)) {
3928 ext4_msg(sb, KERN_ERR, "can't mount with "
3929 "both data=journal and dioread_nolock");
3930 goto failed_mount;
3931 }
3932 if (test_opt(sb, DAX)) {
3933 ext4_msg(sb, KERN_ERR, "can't mount with "
3934 "both data=journal and dax");
3935 goto failed_mount;
3936 }
3937 if (ext4_has_feature_encrypt(sb)) {
3938 ext4_msg(sb, KERN_WARNING,
3939 "encrypted files will use data=ordered "
3940 "instead of data journaling mode");
3941 }
3942 if (test_opt(sb, DELALLOC))
3943 clear_opt(sb, DELALLOC);
3944 } else {
3945 sb->s_iflags |= SB_I_CGROUPWB;
3946 }
3947
3948 sb->s_flags = (sb->s_flags & ~SB_POSIXACL) |
3949 (test_opt(sb, POSIX_ACL) ? SB_POSIXACL : 0);
3950
3951 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
3952 (ext4_has_compat_features(sb) ||
3953 ext4_has_ro_compat_features(sb) ||
3954 ext4_has_incompat_features(sb)))
3955 ext4_msg(sb, KERN_WARNING,
3956 "feature flags set on rev 0 fs, "
3957 "running e2fsck is recommended");
3958
3959 if (es->s_creator_os == cpu_to_le32(EXT4_OS_HURD)) {
3960 set_opt2(sb, HURD_COMPAT);
3961 if (ext4_has_feature_64bit(sb)) {
3962 ext4_msg(sb, KERN_ERR,
3963 "The Hurd can't support 64-bit file systems");
3964 goto failed_mount;
3965 }
3966
3967
3968
3969
3970
3971 if (ext4_has_feature_ea_inode(sb)) {
3972 ext4_msg(sb, KERN_ERR,
3973 "ea_inode feature is not supported for Hurd");
3974 goto failed_mount;
3975 }
3976 }
3977
3978 if (IS_EXT2_SB(sb)) {
3979 if (ext2_feature_set_ok(sb))
3980 ext4_msg(sb, KERN_INFO, "mounting ext2 file system "
3981 "using the ext4 subsystem");
3982 else {
3983
3984
3985
3986
3987 if (silent && ext4_feature_set_ok(sb, sb_rdonly(sb)))
3988 goto failed_mount;
3989 ext4_msg(sb, KERN_ERR, "couldn't mount as ext2 due "
3990 "to feature incompatibilities");
3991 goto failed_mount;
3992 }
3993 }
3994
3995 if (IS_EXT3_SB(sb)) {
3996 if (ext3_feature_set_ok(sb))
3997 ext4_msg(sb, KERN_INFO, "mounting ext3 file system "
3998 "using the ext4 subsystem");
3999 else {
4000
4001
4002
4003
4004 if (silent && ext4_feature_set_ok(sb, sb_rdonly(sb)))
4005 goto failed_mount;
4006 ext4_msg(sb, KERN_ERR, "couldn't mount as ext3 due "
4007 "to feature incompatibilities");
4008 goto failed_mount;
4009 }
4010 }
4011
4012
4013
4014
4015
4016
4017 if (!ext4_feature_set_ok(sb, (sb_rdonly(sb))))
4018 goto failed_mount;
4019
4020 if (le32_to_cpu(es->s_log_block_size) >
4021 (EXT4_MAX_BLOCK_LOG_SIZE - EXT4_MIN_BLOCK_LOG_SIZE)) {
4022 ext4_msg(sb, KERN_ERR,
4023 "Invalid log block size: %u",
4024 le32_to_cpu(es->s_log_block_size));
4025 goto failed_mount;
4026 }
4027 if (le32_to_cpu(es->s_log_cluster_size) >
4028 (EXT4_MAX_CLUSTER_LOG_SIZE - EXT4_MIN_BLOCK_LOG_SIZE)) {
4029 ext4_msg(sb, KERN_ERR,
4030 "Invalid log cluster size: %u",
4031 le32_to_cpu(es->s_log_cluster_size));
4032 goto failed_mount;
4033 }
4034
4035 if (le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) > (blocksize / 4)) {
4036 ext4_msg(sb, KERN_ERR,
4037 "Number of reserved GDT blocks insanely large: %d",
4038 le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks));
4039 goto failed_mount;
4040 }
4041
4042 if (sbi->s_mount_opt & EXT4_MOUNT_DAX) {
4043 if (ext4_has_feature_inline_data(sb)) {
4044 ext4_msg(sb, KERN_ERR, "Cannot use DAX on a filesystem"
4045 " that may contain inline data");
4046 goto failed_mount;
4047 }
4048 if (!bdev_dax_supported(sb->s_bdev, blocksize)) {
4049 ext4_msg(sb, KERN_ERR,
4050 "DAX unsupported by block device.");
4051 goto failed_mount;
4052 }
4053 }
4054
4055 if (ext4_has_feature_encrypt(sb) && es->s_encryption_level) {
4056 ext4_msg(sb, KERN_ERR, "Unsupported encryption level %d",
4057 es->s_encryption_level);
4058 goto failed_mount;
4059 }
4060
4061 if (sb->s_blocksize != blocksize) {
4062
4063 if (!sb_set_blocksize(sb, blocksize)) {
4064 ext4_msg(sb, KERN_ERR, "bad block size %d",
4065 blocksize);
4066 goto failed_mount;
4067 }
4068
4069 brelse(bh);
4070 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
4071 offset = do_div(logical_sb_block, blocksize);
4072 bh = sb_bread_unmovable(sb, logical_sb_block);
4073 if (!bh) {
4074 ext4_msg(sb, KERN_ERR,
4075 "Can't read superblock on 2nd try");
4076 goto failed_mount;
4077 }
4078 es = (struct ext4_super_block *)(bh->b_data + offset);
4079 sbi->s_es = es;
4080 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
4081 ext4_msg(sb, KERN_ERR,
4082 "Magic mismatch, very weird!");
4083 goto failed_mount;
4084 }
4085 }
4086
4087 has_huge_files = ext4_has_feature_huge_file(sb);
4088 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
4089 has_huge_files);
4090 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
4091
4092 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
4093 if (ext4_has_feature_64bit(sb)) {
4094 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
4095 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
4096 !is_power_of_2(sbi->s_desc_size)) {
4097 ext4_msg(sb, KERN_ERR,
4098 "unsupported descriptor size %lu",
4099 sbi->s_desc_size);
4100 goto failed_mount;
4101 }
4102 } else
4103 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
4104
4105 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
4106 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
4107
4108 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
4109 if (sbi->s_inodes_per_block == 0)
4110 goto cantfind_ext4;
4111 if (sbi->s_inodes_per_group < sbi->s_inodes_per_block ||
4112 sbi->s_inodes_per_group > blocksize * 8) {
4113 ext4_msg(sb, KERN_ERR, "invalid inodes per group: %lu\n",
4114 sbi->s_inodes_per_group);
4115 goto failed_mount;
4116 }
4117 sbi->s_itb_per_group = sbi->s_inodes_per_group /
4118 sbi->s_inodes_per_block;
4119 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
4120 sbi->s_sbh = bh;
4121 sbi->s_mount_state = le16_to_cpu(es->s_state);
4122 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
4123 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
4124
4125 for (i = 0; i < 4; i++)
4126 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
4127 sbi->s_def_hash_version = es->s_def_hash_version;
4128 if (ext4_has_feature_dir_index(sb)) {
4129 i = le32_to_cpu(es->s_flags);
4130 if (i & EXT2_FLAGS_UNSIGNED_HASH)
4131 sbi->s_hash_unsigned = 3;
4132 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
4133 #ifdef __CHAR_UNSIGNED__
4134 if (!sb_rdonly(sb))
4135 es->s_flags |=
4136 cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
4137 sbi->s_hash_unsigned = 3;
4138 #else
4139 if (!sb_rdonly(sb))
4140 es->s_flags |=
4141 cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
4142 #endif
4143 }
4144 }
4145
4146
4147 clustersize = BLOCK_SIZE << le32_to_cpu(es->s_log_cluster_size);
4148 has_bigalloc = ext4_has_feature_bigalloc(sb);
4149 if (has_bigalloc) {
4150 if (clustersize < blocksize) {
4151 ext4_msg(sb, KERN_ERR,
4152 "cluster size (%d) smaller than "
4153 "block size (%d)", clustersize, blocksize);
4154 goto failed_mount;
4155 }
4156 sbi->s_cluster_bits = le32_to_cpu(es->s_log_cluster_size) -
4157 le32_to_cpu(es->s_log_block_size);
4158 sbi->s_clusters_per_group =
4159 le32_to_cpu(es->s_clusters_per_group);
4160 if (sbi->s_clusters_per_group > blocksize * 8) {
4161 ext4_msg(sb, KERN_ERR,
4162 "#clusters per group too big: %lu",
4163 sbi->s_clusters_per_group);
4164 goto failed_mount;
4165 }
4166 if (sbi->s_blocks_per_group !=
4167 (sbi->s_clusters_per_group * (clustersize / blocksize))) {
4168 ext4_msg(sb, KERN_ERR, "blocks per group (%lu) and "
4169 "clusters per group (%lu) inconsistent",
4170 sbi->s_blocks_per_group,
4171 sbi->s_clusters_per_group);
4172 goto failed_mount;
4173 }
4174 } else {
4175 if (clustersize != blocksize) {
4176 ext4_msg(sb, KERN_ERR,
4177 "fragment/cluster size (%d) != "
4178 "block size (%d)", clustersize, blocksize);
4179 goto failed_mount;
4180 }
4181 if (sbi->s_blocks_per_group > blocksize * 8) {
4182 ext4_msg(sb, KERN_ERR,
4183 "#blocks per group too big: %lu",
4184 sbi->s_blocks_per_group);
4185 goto failed_mount;
4186 }
4187 sbi->s_clusters_per_group = sbi->s_blocks_per_group;
4188 sbi->s_cluster_bits = 0;
4189 }
4190 sbi->s_cluster_ratio = clustersize / blocksize;
4191
4192
4193 if (sbi->s_blocks_per_group == clustersize << 3)
4194 set_opt2(sb, STD_GROUP_SIZE);
4195
4196
4197
4198
4199
4200 err = generic_check_addressable(sb->s_blocksize_bits,
4201 ext4_blocks_count(es));
4202 if (err) {
4203 ext4_msg(sb, KERN_ERR, "filesystem"
4204 " too large to mount safely on this system");
4205 goto failed_mount;
4206 }
4207
4208 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
4209 goto cantfind_ext4;
4210
4211
4212 blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
4213 if (blocks_count && ext4_blocks_count(es) > blocks_count) {
4214 ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
4215 "exceeds size of device (%llu blocks)",
4216 ext4_blocks_count(es), blocks_count);
4217 goto failed_mount;
4218 }
4219
4220
4221
4222
4223
4224 if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
4225 ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
4226 "block %u is beyond end of filesystem (%llu)",
4227 le32_to_cpu(es->s_first_data_block),
4228 ext4_blocks_count(es));
4229 goto failed_mount;
4230 }
4231 if ((es->s_first_data_block == 0) && (es->s_log_block_size == 0) &&
4232 (sbi->s_cluster_ratio == 1)) {
4233 ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
4234 "block is 0 with a 1k block and cluster size");
4235 goto failed_mount;
4236 }
4237
4238 blocks_count = (ext4_blocks_count(es) -
4239 le32_to_cpu(es->s_first_data_block) +
4240 EXT4_BLOCKS_PER_GROUP(sb) - 1);
4241 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
4242 if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
4243 ext4_msg(sb, KERN_WARNING, "groups count too large: %llu "
4244 "(block count %llu, first data block %u, "
4245 "blocks per group %lu)", blocks_count,
4246 ext4_blocks_count(es),
4247 le32_to_cpu(es->s_first_data_block),
4248 EXT4_BLOCKS_PER_GROUP(sb));
4249 goto failed_mount;
4250 }
4251 sbi->s_groups_count = blocks_count;
4252 sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
4253 (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
4254 if (((u64)sbi->s_groups_count * sbi->s_inodes_per_group) !=
4255 le32_to_cpu(es->s_inodes_count)) {
4256 ext4_msg(sb, KERN_ERR, "inodes count not valid: %u vs %llu",
4257 le32_to_cpu(es->s_inodes_count),
4258 ((u64)sbi->s_groups_count * sbi->s_inodes_per_group));
4259 ret = -EINVAL;
4260 goto failed_mount;
4261 }
4262 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
4263 EXT4_DESC_PER_BLOCK(sb);
4264 if (ext4_has_feature_meta_bg(sb)) {
4265 if (le32_to_cpu(es->s_first_meta_bg) > db_count) {
4266 ext4_msg(sb, KERN_WARNING,
4267 "first meta block group too large: %u "
4268 "(group descriptor block count %u)",
4269 le32_to_cpu(es->s_first_meta_bg), db_count);
4270 goto failed_mount;
4271 }
4272 }
4273 rcu_assign_pointer(sbi->s_group_desc,
4274 kvmalloc_array(db_count,
4275 sizeof(struct buffer_head *),
4276 GFP_KERNEL));
4277 if (sbi->s_group_desc == NULL) {
4278 ext4_msg(sb, KERN_ERR, "not enough memory");
4279 ret = -ENOMEM;
4280 goto failed_mount;
4281 }
4282
4283 bgl_lock_init(sbi->s_blockgroup_lock);
4284
4285
4286 for (i = 0; i < db_count; i++) {
4287 block = descriptor_loc(sb, logical_sb_block, i);
4288 sb_breadahead_unmovable(sb, block);
4289 }
4290
4291 for (i = 0; i < db_count; i++) {
4292 struct buffer_head *bh;
4293
4294 block = descriptor_loc(sb, logical_sb_block, i);
4295 bh = sb_bread_unmovable(sb, block);
4296 if (!bh) {
4297 ext4_msg(sb, KERN_ERR,
4298 "can't read group descriptor %d", i);
4299 db_count = i;
4300 goto failed_mount2;
4301 }
4302 rcu_read_lock();
4303 rcu_dereference(sbi->s_group_desc)[i] = bh;
4304 rcu_read_unlock();
4305 }
4306 sbi->s_gdb_count = db_count;
4307 if (!ext4_check_descriptors(sb, logical_sb_block, &first_not_zeroed)) {
4308 ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
4309 ret = -EFSCORRUPTED;
4310 goto failed_mount2;
4311 }
4312
4313 timer_setup(&sbi->s_err_report, print_daily_error_info, 0);
4314
4315
4316 if (ext4_es_register_shrinker(sbi))
4317 goto failed_mount3;
4318
4319 sbi->s_stripe = ext4_get_stripe_size(sbi);
4320 sbi->s_extent_max_zeroout_kb = 32;
4321
4322
4323
4324
4325 sb->s_op = &ext4_sops;
4326 sb->s_export_op = &ext4_export_ops;
4327 sb->s_xattr = ext4_xattr_handlers;
4328 #ifdef CONFIG_FS_ENCRYPTION
4329 sb->s_cop = &ext4_cryptops;
4330 #endif
4331 #ifdef CONFIG_FS_VERITY
4332 sb->s_vop = &ext4_verityops;
4333 #endif
4334 #ifdef CONFIG_QUOTA
4335 sb->dq_op = &ext4_quota_operations;
4336 if (ext4_has_feature_quota(sb))
4337 sb->s_qcop = &dquot_quotactl_sysfile_ops;
4338 else
4339 sb->s_qcop = &ext4_qctl_operations;
4340 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP | QTYPE_MASK_PRJ;
4341 #endif
4342 memcpy(&sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
4343
4344 INIT_LIST_HEAD(&sbi->s_orphan);
4345 mutex_init(&sbi->s_orphan_lock);
4346
4347 sb->s_root = NULL;
4348
4349 needs_recovery = (es->s_last_orphan != 0 ||
4350 ext4_has_feature_journal_needs_recovery(sb));
4351
4352 if (ext4_has_feature_mmp(sb) && !sb_rdonly(sb))
4353 if (ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block)))
4354 goto failed_mount3a;
4355
4356
4357
4358
4359
4360 if (!test_opt(sb, NOLOAD) && ext4_has_feature_journal(sb)) {
4361 err = ext4_load_journal(sb, es, journal_devnum);
4362 if (err)
4363 goto failed_mount3a;
4364 } else if (test_opt(sb, NOLOAD) && !sb_rdonly(sb) &&
4365 ext4_has_feature_journal_needs_recovery(sb)) {
4366 ext4_msg(sb, KERN_ERR, "required journal recovery "
4367 "suppressed and not mounted read-only");
4368 goto failed_mount_wq;
4369 } else {
4370
4371 if (test_opt2(sb, EXPLICIT_JOURNAL_CHECKSUM)) {
4372 ext4_msg(sb, KERN_ERR, "can't mount with "
4373 "journal_checksum, fs mounted w/o journal");
4374 goto failed_mount_wq;
4375 }
4376 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
4377 ext4_msg(sb, KERN_ERR, "can't mount with "
4378 "journal_async_commit, fs mounted w/o journal");
4379 goto failed_mount_wq;
4380 }
4381 if (sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) {
4382 ext4_msg(sb, KERN_ERR, "can't mount with "
4383 "commit=%lu, fs mounted w/o journal",
4384 sbi->s_commit_interval / HZ);
4385 goto failed_mount_wq;
4386 }
4387 if (EXT4_MOUNT_DATA_FLAGS &
4388 (sbi->s_mount_opt ^ sbi->s_def_mount_opt)) {
4389 ext4_msg(sb, KERN_ERR, "can't mount with "
4390 "data=, fs mounted w/o journal");
4391 goto failed_mount_wq;
4392 }
4393 sbi->s_def_mount_opt &= ~EXT4_MOUNT_JOURNAL_CHECKSUM;
4394 clear_opt(sb, JOURNAL_CHECKSUM);
4395 clear_opt(sb, DATA_FLAGS);
4396 sbi->s_journal = NULL;
4397 needs_recovery = 0;
4398 goto no_journal;
4399 }
4400
4401 if (ext4_has_feature_64bit(sb) &&
4402 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
4403 JBD2_FEATURE_INCOMPAT_64BIT)) {
4404 ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
4405 goto failed_mount_wq;
4406 }
4407
4408 if (!set_journal_csum_feature_set(sb)) {
4409 ext4_msg(sb, KERN_ERR, "Failed to set journal checksum "
4410 "feature set");
4411 goto failed_mount_wq;
4412 }
4413
4414
4415
4416 switch (test_opt(sb, DATA_FLAGS)) {
4417 case 0:
4418
4419
4420
4421
4422 if (jbd2_journal_check_available_features
4423 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
4424 set_opt(sb, ORDERED_DATA);
4425 sbi->s_def_mount_opt |= EXT4_MOUNT_ORDERED_DATA;
4426 } else {
4427 set_opt(sb, JOURNAL_DATA);
4428 sbi->s_def_mount_opt |= EXT4_MOUNT_JOURNAL_DATA;
4429 }
4430 break;
4431
4432 case EXT4_MOUNT_ORDERED_DATA:
4433 case EXT4_MOUNT_WRITEBACK_DATA:
4434 if (!jbd2_journal_check_available_features
4435 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
4436 ext4_msg(sb, KERN_ERR, "Journal does not support "
4437 "requested data journaling mode");
4438 goto failed_mount_wq;
4439 }
4440 default:
4441 break;
4442 }
4443
4444 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA &&
4445 test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
4446 ext4_msg(sb, KERN_ERR, "can't mount with "
4447 "journal_async_commit in data=ordered mode");
4448 goto failed_mount_wq;
4449 }
4450
4451 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
4452
4453 sbi->s_journal->j_commit_callback = ext4_journal_commit_callback;
4454
4455 no_journal:
4456 if (!test_opt(sb, NO_MBCACHE)) {
4457 sbi->s_ea_block_cache = ext4_xattr_create_cache();
4458 if (!sbi->s_ea_block_cache) {
4459 ext4_msg(sb, KERN_ERR,
4460 "Failed to create ea_block_cache");
4461 goto failed_mount_wq;
4462 }
4463
4464 if (ext4_has_feature_ea_inode(sb)) {
4465 sbi->s_ea_inode_cache = ext4_xattr_create_cache();
4466 if (!sbi->s_ea_inode_cache) {
4467 ext4_msg(sb, KERN_ERR,
4468 "Failed to create ea_inode_cache");
4469 goto failed_mount_wq;
4470 }
4471 }
4472 }
4473
4474 if ((DUMMY_ENCRYPTION_ENABLED(sbi) || ext4_has_feature_encrypt(sb)) &&
4475 (blocksize != PAGE_SIZE)) {
4476 ext4_msg(sb, KERN_ERR,
4477 "Unsupported blocksize for fs encryption");
4478 goto failed_mount_wq;
4479 }
4480
4481 if (ext4_has_feature_verity(sb) && blocksize != PAGE_SIZE) {
4482 ext4_msg(sb, KERN_ERR, "Unsupported blocksize for fs-verity");
4483 goto failed_mount_wq;
4484 }
4485
4486 if (DUMMY_ENCRYPTION_ENABLED(sbi) && !sb_rdonly(sb) &&
4487 !ext4_has_feature_encrypt(sb)) {
4488 ext4_set_feature_encrypt(sb);
4489 ext4_commit_super(sb, 1);
4490 }
4491
4492
4493
4494
4495
4496 if (es->s_overhead_clusters)
4497 sbi->s_overhead = le32_to_cpu(es->s_overhead_clusters);
4498 else {
4499 err = ext4_calculate_overhead(sb);
4500 if (err)
4501 goto failed_mount_wq;
4502 }
4503
4504
4505
4506
4507
4508 EXT4_SB(sb)->rsv_conversion_wq =
4509 alloc_workqueue("ext4-rsv-conversion", WQ_MEM_RECLAIM | WQ_UNBOUND, 1);
4510 if (!EXT4_SB(sb)->rsv_conversion_wq) {
4511 printk(KERN_ERR "EXT4-fs: failed to create workqueue\n");
4512 ret = -ENOMEM;
4513 goto failed_mount4;
4514 }
4515
4516
4517
4518
4519
4520
4521 root = ext4_iget(sb, EXT4_ROOT_INO, EXT4_IGET_SPECIAL);
4522 if (IS_ERR(root)) {
4523 ext4_msg(sb, KERN_ERR, "get root inode failed");
4524 ret = PTR_ERR(root);
4525 root = NULL;
4526 goto failed_mount4;
4527 }
4528 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
4529 ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
4530 iput(root);
4531 goto failed_mount4;
4532 }
4533
4534 #ifdef CONFIG_UNICODE
4535 if (sbi->s_encoding)
4536 sb->s_d_op = &ext4_dentry_ops;
4537 #endif
4538
4539 sb->s_root = d_make_root(root);
4540 if (!sb->s_root) {
4541 ext4_msg(sb, KERN_ERR, "get root dentry failed");
4542 ret = -ENOMEM;
4543 goto failed_mount4;
4544 }
4545
4546 ret = ext4_setup_super(sb, es, sb_rdonly(sb));
4547 if (ret == -EROFS) {
4548 sb->s_flags |= SB_RDONLY;
4549 ret = 0;
4550 } else if (ret)
4551 goto failed_mount4a;
4552
4553 ext4_set_resv_clusters(sb);
4554
4555 err = ext4_setup_system_zone(sb);
4556 if (err) {
4557 ext4_msg(sb, KERN_ERR, "failed to initialize system "
4558 "zone (%d)", err);
4559 goto failed_mount4a;
4560 }
4561
4562 ext4_ext_init(sb);
4563 err = ext4_mb_init(sb);
4564 if (err) {
4565 ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)",
4566 err);
4567 goto failed_mount5;
4568 }
4569
4570 block = ext4_count_free_clusters(sb);
4571 ext4_free_blocks_count_set(sbi->s_es,
4572 EXT4_C2B(sbi, block));
4573 ext4_superblock_csum_set(sb);
4574 err = percpu_counter_init(&sbi->s_freeclusters_counter, block,
4575 GFP_KERNEL);
4576 if (!err) {
4577 unsigned long freei = ext4_count_free_inodes(sb);
4578 sbi->s_es->s_free_inodes_count = cpu_to_le32(freei);
4579 ext4_superblock_csum_set(sb);
4580 err = percpu_counter_init(&sbi->s_freeinodes_counter, freei,
4581 GFP_KERNEL);
4582 }
4583 if (!err)
4584 err = percpu_counter_init(&sbi->s_dirs_counter,
4585 ext4_count_dirs(sb), GFP_KERNEL);
4586 if (!err)
4587 err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0,
4588 GFP_KERNEL);
4589 if (!err)
4590 err = percpu_init_rwsem(&sbi->s_writepages_rwsem);
4591
4592 if (err) {
4593 ext4_msg(sb, KERN_ERR, "insufficient memory");
4594 goto failed_mount6;
4595 }
4596
4597 if (ext4_has_feature_flex_bg(sb))
4598 if (!ext4_fill_flex_info(sb)) {
4599 ext4_msg(sb, KERN_ERR,
4600 "unable to initialize "
4601 "flex_bg meta info!");
4602 goto failed_mount6;
4603 }
4604
4605 err = ext4_register_li_request(sb, first_not_zeroed);
4606 if (err)
4607 goto failed_mount6;
4608
4609 err = ext4_register_sysfs(sb);
4610 if (err)
4611 goto failed_mount7;
4612
4613 #ifdef CONFIG_QUOTA
4614
4615 if (ext4_has_feature_quota(sb) && !sb_rdonly(sb)) {
4616 err = ext4_enable_quotas(sb);
4617 if (err)
4618 goto failed_mount8;
4619 }
4620 #endif
4621
4622 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
4623 ext4_orphan_cleanup(sb, es);
4624 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
4625 if (needs_recovery) {
4626 ext4_msg(sb, KERN_INFO, "recovery complete");
4627 ext4_mark_recovery_complete(sb, es);
4628 }
4629 if (EXT4_SB(sb)->s_journal) {
4630 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
4631 descr = " journalled data mode";
4632 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
4633 descr = " ordered data mode";
4634 else
4635 descr = " writeback data mode";
4636 } else
4637 descr = "out journal";
4638
4639 if (test_opt(sb, DISCARD)) {
4640 struct request_queue *q = bdev_get_queue(sb->s_bdev);
4641 if (!blk_queue_discard(q))
4642 ext4_msg(sb, KERN_WARNING,
4643 "mounting with \"discard\" option, but "
4644 "the device does not support discard");
4645 }
4646
4647 if (___ratelimit(&ext4_mount_msg_ratelimit, "EXT4-fs mount"))
4648 ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. "
4649 "Opts: %.*s%s%s", descr,
4650 (int) sizeof(sbi->s_es->s_mount_opts),
4651 sbi->s_es->s_mount_opts,
4652 *sbi->s_es->s_mount_opts ? "; " : "", orig_data);
4653
4654 if (es->s_error_count)
4655 mod_timer(&sbi->s_err_report, jiffies + 300*HZ);
4656
4657
4658 ratelimit_state_init(&sbi->s_err_ratelimit_state, 5 * HZ, 10);
4659 ratelimit_state_init(&sbi->s_warning_ratelimit_state, 5 * HZ, 10);
4660 ratelimit_state_init(&sbi->s_msg_ratelimit_state, 5 * HZ, 10);
4661
4662 kfree(orig_data);
4663 return 0;
4664
4665 cantfind_ext4:
4666 if (!silent)
4667 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
4668 goto failed_mount;
4669
4670 #ifdef CONFIG_QUOTA
4671 failed_mount8:
4672 ext4_unregister_sysfs(sb);
4673 #endif
4674 failed_mount7:
4675 ext4_unregister_li_request(sb);
4676 failed_mount6:
4677 ext4_mb_release(sb);
4678 rcu_read_lock();
4679 flex_groups = rcu_dereference(sbi->s_flex_groups);
4680 if (flex_groups) {
4681 for (i = 0; i < sbi->s_flex_groups_allocated; i++)
4682 kvfree(flex_groups[i]);
4683 kvfree(flex_groups);
4684 }
4685 rcu_read_unlock();
4686 percpu_counter_destroy(&sbi->s_freeclusters_counter);
4687 percpu_counter_destroy(&sbi->s_freeinodes_counter);
4688 percpu_counter_destroy(&sbi->s_dirs_counter);
4689 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
4690 percpu_free_rwsem(&sbi->s_writepages_rwsem);
4691 failed_mount5:
4692 ext4_ext_release(sb);
4693 ext4_release_system_zone(sb);
4694 failed_mount4a:
4695 dput(sb->s_root);
4696 sb->s_root = NULL;
4697 failed_mount4:
4698 ext4_msg(sb, KERN_ERR, "mount failed");
4699 if (EXT4_SB(sb)->rsv_conversion_wq)
4700 destroy_workqueue(EXT4_SB(sb)->rsv_conversion_wq);
4701 failed_mount_wq:
4702 ext4_xattr_destroy_cache(sbi->s_ea_inode_cache);
4703 sbi->s_ea_inode_cache = NULL;
4704
4705 ext4_xattr_destroy_cache(sbi->s_ea_block_cache);
4706 sbi->s_ea_block_cache = NULL;
4707
4708 if (sbi->s_journal) {
4709 jbd2_journal_destroy(sbi->s_journal);
4710 sbi->s_journal = NULL;
4711 }
4712 failed_mount3a:
4713 ext4_es_unregister_shrinker(sbi);
4714 failed_mount3:
4715 del_timer_sync(&sbi->s_err_report);
4716 if (sbi->s_mmp_tsk)
4717 kthread_stop(sbi->s_mmp_tsk);
4718 failed_mount2:
4719 rcu_read_lock();
4720 group_desc = rcu_dereference(sbi->s_group_desc);
4721 for (i = 0; i < db_count; i++)
4722 brelse(group_desc[i]);
4723 kvfree(group_desc);
4724 rcu_read_unlock();
4725 failed_mount:
4726 if (sbi->s_chksum_driver)
4727 crypto_free_shash(sbi->s_chksum_driver);
4728
4729 #ifdef CONFIG_UNICODE
4730 utf8_unload(sbi->s_encoding);
4731 #endif
4732
4733 #ifdef CONFIG_QUOTA
4734 for (i = 0; i < EXT4_MAXQUOTAS; i++)
4735 kfree(get_qf_name(sb, sbi, i));
4736 #endif
4737 ext4_blkdev_remove(sbi);
4738 brelse(bh);
4739 out_fail:
4740 sb->s_fs_info = NULL;
4741 kfree(sbi->s_blockgroup_lock);
4742 out_free_base:
4743 kfree(sbi);
4744 kfree(orig_data);
4745 fs_put_dax(dax_dev);
4746 return err ? err : ret;
4747 }
4748
4749
4750
4751
4752
4753
4754 static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
4755 {
4756 struct ext4_sb_info *sbi = EXT4_SB(sb);
4757
4758 journal->j_commit_interval = sbi->s_commit_interval;
4759 journal->j_min_batch_time = sbi->s_min_batch_time;
4760 journal->j_max_batch_time = sbi->s_max_batch_time;
4761
4762 write_lock(&journal->j_state_lock);
4763 if (test_opt(sb, BARRIER))
4764 journal->j_flags |= JBD2_BARRIER;
4765 else
4766 journal->j_flags &= ~JBD2_BARRIER;
4767 if (test_opt(sb, DATA_ERR_ABORT))
4768 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
4769 else
4770 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
4771 write_unlock(&journal->j_state_lock);
4772 }
4773
4774 static struct inode *ext4_get_journal_inode(struct super_block *sb,
4775 unsigned int journal_inum)
4776 {
4777 struct inode *journal_inode;
4778
4779
4780
4781
4782
4783
4784 journal_inode = ext4_iget(sb, journal_inum, EXT4_IGET_SPECIAL);
4785 if (IS_ERR(journal_inode)) {
4786 ext4_msg(sb, KERN_ERR, "no journal found");
4787 return NULL;
4788 }
4789 if (!journal_inode->i_nlink) {
4790 make_bad_inode(journal_inode);
4791 iput(journal_inode);
4792 ext4_msg(sb, KERN_ERR, "journal inode is deleted");
4793 return NULL;
4794 }
4795
4796 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
4797 journal_inode, journal_inode->i_size);
4798 if (!S_ISREG(journal_inode->i_mode)) {
4799 ext4_msg(sb, KERN_ERR, "invalid journal inode");
4800 iput(journal_inode);
4801 return NULL;
4802 }
4803 return journal_inode;
4804 }
4805
4806 static journal_t *ext4_get_journal(struct super_block *sb,
4807 unsigned int journal_inum)
4808 {
4809 struct inode *journal_inode;
4810 journal_t *journal;
4811
4812 BUG_ON(!ext4_has_feature_journal(sb));
4813
4814 journal_inode = ext4_get_journal_inode(sb, journal_inum);
4815 if (!journal_inode)
4816 return NULL;
4817
4818 journal = jbd2_journal_init_inode(journal_inode);
4819 if (!journal) {
4820 ext4_msg(sb, KERN_ERR, "Could not load journal inode");
4821 iput(journal_inode);
4822 return NULL;
4823 }
4824 journal->j_private = sb;
4825 ext4_init_journal_params(sb, journal);
4826 return journal;
4827 }
4828
4829 static journal_t *ext4_get_dev_journal(struct super_block *sb,
4830 dev_t j_dev)
4831 {
4832 struct buffer_head *bh;
4833 journal_t *journal;
4834 ext4_fsblk_t start;
4835 ext4_fsblk_t len;
4836 int hblock, blocksize;
4837 ext4_fsblk_t sb_block;
4838 unsigned long offset;
4839 struct ext4_super_block *es;
4840 struct block_device *bdev;
4841
4842 BUG_ON(!ext4_has_feature_journal(sb));
4843
4844 bdev = ext4_blkdev_get(j_dev, sb);
4845 if (bdev == NULL)
4846 return NULL;
4847
4848 blocksize = sb->s_blocksize;
4849 hblock = bdev_logical_block_size(bdev);
4850 if (blocksize < hblock) {
4851 ext4_msg(sb, KERN_ERR,
4852 "blocksize too small for journal device");
4853 goto out_bdev;
4854 }
4855
4856 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
4857 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
4858 set_blocksize(bdev, blocksize);
4859 if (!(bh = __bread(bdev, sb_block, blocksize))) {
4860 ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
4861 "external journal");
4862 goto out_bdev;
4863 }
4864
4865 es = (struct ext4_super_block *) (bh->b_data + offset);
4866 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
4867 !(le32_to_cpu(es->s_feature_incompat) &
4868 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
4869 ext4_msg(sb, KERN_ERR, "external journal has "
4870 "bad superblock");
4871 brelse(bh);
4872 goto out_bdev;
4873 }
4874
4875 if ((le32_to_cpu(es->s_feature_ro_compat) &
4876 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) &&
4877 es->s_checksum != ext4_superblock_csum(sb, es)) {
4878 ext4_msg(sb, KERN_ERR, "external journal has "
4879 "corrupt superblock");
4880 brelse(bh);
4881 goto out_bdev;
4882 }
4883
4884 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
4885 ext4_msg(sb, KERN_ERR, "journal UUID does not match");
4886 brelse(bh);
4887 goto out_bdev;
4888 }
4889
4890 len = ext4_blocks_count(es);
4891 start = sb_block + 1;
4892 brelse(bh);
4893
4894 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
4895 start, len, blocksize);
4896 if (!journal) {
4897 ext4_msg(sb, KERN_ERR, "failed to create device journal");
4898 goto out_bdev;
4899 }
4900 journal->j_private = sb;
4901 ll_rw_block(REQ_OP_READ, REQ_META | REQ_PRIO, 1, &journal->j_sb_buffer);
4902 wait_on_buffer(journal->j_sb_buffer);
4903 if (!buffer_uptodate(journal->j_sb_buffer)) {
4904 ext4_msg(sb, KERN_ERR, "I/O error on journal device");
4905 goto out_journal;
4906 }
4907 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
4908 ext4_msg(sb, KERN_ERR, "External journal has more than one "
4909 "user (unsupported) - %d",
4910 be32_to_cpu(journal->j_superblock->s_nr_users));
4911 goto out_journal;
4912 }
4913 EXT4_SB(sb)->journal_bdev = bdev;
4914 ext4_init_journal_params(sb, journal);
4915 return journal;
4916
4917 out_journal:
4918 jbd2_journal_destroy(journal);
4919 out_bdev:
4920 ext4_blkdev_put(bdev);
4921 return NULL;
4922 }
4923
4924 static int ext4_load_journal(struct super_block *sb,
4925 struct ext4_super_block *es,
4926 unsigned long journal_devnum)
4927 {
4928 journal_t *journal;
4929 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
4930 dev_t journal_dev;
4931 int err = 0;
4932 int really_read_only;
4933
4934 BUG_ON(!ext4_has_feature_journal(sb));
4935
4936 if (journal_devnum &&
4937 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
4938 ext4_msg(sb, KERN_INFO, "external journal device major/minor "
4939 "numbers have changed");
4940 journal_dev = new_decode_dev(journal_devnum);
4941 } else
4942 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
4943
4944 really_read_only = bdev_read_only(sb->s_bdev);
4945
4946
4947
4948
4949
4950
4951 if (ext4_has_feature_journal_needs_recovery(sb)) {
4952 if (sb_rdonly(sb)) {
4953 ext4_msg(sb, KERN_INFO, "INFO: recovery "
4954 "required on readonly filesystem");
4955 if (really_read_only) {
4956 ext4_msg(sb, KERN_ERR, "write access "
4957 "unavailable, cannot proceed "
4958 "(try mounting with noload)");
4959 return -EROFS;
4960 }
4961 ext4_msg(sb, KERN_INFO, "write access will "
4962 "be enabled during recovery");
4963 }
4964 }
4965
4966 if (journal_inum && journal_dev) {
4967 ext4_msg(sb, KERN_ERR, "filesystem has both journal "
4968 "and inode journals!");
4969 return -EINVAL;
4970 }
4971
4972 if (journal_inum) {
4973 if (!(journal = ext4_get_journal(sb, journal_inum)))
4974 return -EINVAL;
4975 } else {
4976 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
4977 return -EINVAL;
4978 }
4979
4980 if (!(journal->j_flags & JBD2_BARRIER))
4981 ext4_msg(sb, KERN_INFO, "barriers disabled");
4982
4983 if (!ext4_has_feature_journal_needs_recovery(sb))
4984 err = jbd2_journal_wipe(journal, !really_read_only);
4985 if (!err) {
4986 char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL);
4987 if (save)
4988 memcpy(save, ((char *) es) +
4989 EXT4_S_ERR_START, EXT4_S_ERR_LEN);
4990 err = jbd2_journal_load(journal);
4991 if (save)
4992 memcpy(((char *) es) + EXT4_S_ERR_START,
4993 save, EXT4_S_ERR_LEN);
4994 kfree(save);
4995 }
4996
4997 if (err) {
4998 ext4_msg(sb, KERN_ERR, "error loading journal");
4999 jbd2_journal_destroy(journal);
5000 return err;
5001 }
5002
5003 EXT4_SB(sb)->s_journal = journal;
5004 ext4_clear_journal_err(sb, es);
5005
5006 if (!really_read_only && journal_devnum &&
5007 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
5008 es->s_journal_dev = cpu_to_le32(journal_devnum);
5009
5010
5011 ext4_commit_super(sb, 1);
5012 }
5013
5014 return 0;
5015 }
5016
5017 static int ext4_commit_super(struct super_block *sb, int sync)
5018 {
5019 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
5020 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
5021 int error = 0;
5022
5023 if (!sbh || block_device_ejected(sb))
5024 return error;
5025
5026
5027
5028
5029
5030 if (!buffer_mapped(sbh))
5031 return error;
5032
5033
5034
5035
5036
5037
5038
5039
5040
5041
5042
5043 if (!(sb->s_flags & SB_RDONLY))
5044 ext4_update_tstamp(es, s_wtime);
5045 if (sb->s_bdev->bd_part)
5046 es->s_kbytes_written =
5047 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written +
5048 ((part_stat_read(sb->s_bdev->bd_part,
5049 sectors[STAT_WRITE]) -
5050 EXT4_SB(sb)->s_sectors_written_start) >> 1));
5051 else
5052 es->s_kbytes_written =
5053 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written);
5054 if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeclusters_counter))
5055 ext4_free_blocks_count_set(es,
5056 EXT4_C2B(EXT4_SB(sb), percpu_counter_sum_positive(
5057 &EXT4_SB(sb)->s_freeclusters_counter)));
5058 if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeinodes_counter))
5059 es->s_free_inodes_count =
5060 cpu_to_le32(percpu_counter_sum_positive(
5061 &EXT4_SB(sb)->s_freeinodes_counter));
5062 BUFFER_TRACE(sbh, "marking dirty");
5063 ext4_superblock_csum_set(sb);
5064 if (sync)
5065 lock_buffer(sbh);
5066 if (buffer_write_io_error(sbh) || !buffer_uptodate(sbh)) {
5067
5068
5069
5070
5071
5072
5073
5074
5075 ext4_msg(sb, KERN_ERR, "previous I/O error to "
5076 "superblock detected");
5077 clear_buffer_write_io_error(sbh);
5078 set_buffer_uptodate(sbh);
5079 }
5080 mark_buffer_dirty(sbh);
5081 if (sync) {
5082 unlock_buffer(sbh);
5083 error = __sync_dirty_buffer(sbh,
5084 REQ_SYNC | (test_opt(sb, BARRIER) ? REQ_FUA : 0));
5085 if (buffer_write_io_error(sbh)) {
5086 ext4_msg(sb, KERN_ERR, "I/O error while writing "
5087 "superblock");
5088 clear_buffer_write_io_error(sbh);
5089 set_buffer_uptodate(sbh);
5090 }
5091 }
5092 return error;
5093 }
5094
5095
5096
5097
5098
5099
5100 static void ext4_mark_recovery_complete(struct super_block *sb,
5101 struct ext4_super_block *es)
5102 {
5103 journal_t *journal = EXT4_SB(sb)->s_journal;
5104
5105 if (!ext4_has_feature_journal(sb)) {
5106 BUG_ON(journal != NULL);
5107 return;
5108 }
5109 jbd2_journal_lock_updates(journal);
5110 if (jbd2_journal_flush(journal) < 0)
5111 goto out;
5112
5113 if (ext4_has_feature_journal_needs_recovery(sb) && sb_rdonly(sb)) {
5114 ext4_clear_feature_journal_needs_recovery(sb);
5115 ext4_commit_super(sb, 1);
5116 }
5117
5118 out:
5119 jbd2_journal_unlock_updates(journal);
5120 }
5121
5122
5123
5124
5125
5126
5127 static void ext4_clear_journal_err(struct super_block *sb,
5128 struct ext4_super_block *es)
5129 {
5130 journal_t *journal;
5131 int j_errno;
5132 const char *errstr;
5133
5134 BUG_ON(!ext4_has_feature_journal(sb));
5135
5136 journal = EXT4_SB(sb)->s_journal;
5137
5138
5139
5140
5141
5142
5143 j_errno = jbd2_journal_errno(journal);
5144 if (j_errno) {
5145 char nbuf[16];
5146
5147 errstr = ext4_decode_error(sb, j_errno, nbuf);
5148 ext4_warning(sb, "Filesystem error recorded "
5149 "from previous mount: %s", errstr);
5150 ext4_warning(sb, "Marking fs in need of filesystem check.");
5151
5152 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
5153 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
5154 ext4_commit_super(sb, 1);
5155
5156 jbd2_journal_clear_err(journal);
5157 jbd2_journal_update_sb_errno(journal);
5158 }
5159 }
5160
5161
5162
5163
5164
5165 int ext4_force_commit(struct super_block *sb)
5166 {
5167 journal_t *journal;
5168
5169 if (sb_rdonly(sb))
5170 return 0;
5171
5172 journal = EXT4_SB(sb)->s_journal;
5173 return ext4_journal_force_commit(journal);
5174 }
5175
5176 static int ext4_sync_fs(struct super_block *sb, int wait)
5177 {
5178 int ret = 0;
5179 tid_t target;
5180 bool needs_barrier = false;
5181 struct ext4_sb_info *sbi = EXT4_SB(sb);
5182
5183 if (unlikely(ext4_forced_shutdown(sbi)))
5184 return 0;
5185
5186 trace_ext4_sync_fs(sb, wait);
5187 flush_workqueue(sbi->rsv_conversion_wq);
5188
5189
5190
5191
5192 dquot_writeback_dquots(sb, -1);
5193
5194
5195
5196
5197
5198 if (sbi->s_journal) {
5199 target = jbd2_get_latest_transaction(sbi->s_journal);
5200 if (wait && sbi->s_journal->j_flags & JBD2_BARRIER &&
5201 !jbd2_trans_will_send_data_barrier(sbi->s_journal, target))
5202 needs_barrier = true;
5203
5204 if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
5205 if (wait)
5206 ret = jbd2_log_wait_commit(sbi->s_journal,
5207 target);
5208 }
5209 } else if (wait && test_opt(sb, BARRIER))
5210 needs_barrier = true;
5211 if (needs_barrier) {
5212 int err;
5213 err = blkdev_issue_flush(sb->s_bdev, GFP_KERNEL, NULL);
5214 if (!ret)
5215 ret = err;
5216 }
5217
5218 return ret;
5219 }
5220
5221
5222
5223
5224
5225
5226
5227
5228
5229 static int ext4_freeze(struct super_block *sb)
5230 {
5231 int error = 0;
5232 journal_t *journal;
5233
5234 if (sb_rdonly(sb))
5235 return 0;
5236
5237 journal = EXT4_SB(sb)->s_journal;
5238
5239 if (journal) {
5240
5241 jbd2_journal_lock_updates(journal);
5242
5243
5244
5245
5246
5247 error = jbd2_journal_flush(journal);
5248 if (error < 0)
5249 goto out;
5250
5251
5252 ext4_clear_feature_journal_needs_recovery(sb);
5253 }
5254
5255 error = ext4_commit_super(sb, 1);
5256 out:
5257 if (journal)
5258
5259 jbd2_journal_unlock_updates(journal);
5260 return error;
5261 }
5262
5263
5264
5265
5266
5267 static int ext4_unfreeze(struct super_block *sb)
5268 {
5269 if (sb_rdonly(sb) || ext4_forced_shutdown(EXT4_SB(sb)))
5270 return 0;
5271
5272 if (EXT4_SB(sb)->s_journal) {
5273
5274 ext4_set_feature_journal_needs_recovery(sb);
5275 }
5276
5277 ext4_commit_super(sb, 1);
5278 return 0;
5279 }
5280
5281
5282
5283
5284 struct ext4_mount_options {
5285 unsigned long s_mount_opt;
5286 unsigned long s_mount_opt2;
5287 kuid_t s_resuid;
5288 kgid_t s_resgid;
5289 unsigned long s_commit_interval;
5290 u32 s_min_batch_time, s_max_batch_time;
5291 #ifdef CONFIG_QUOTA
5292 int s_jquota_fmt;
5293 char *s_qf_names[EXT4_MAXQUOTAS];
5294 #endif
5295 };
5296
5297 static int ext4_remount(struct super_block *sb, int *flags, char *data)
5298 {
5299 struct ext4_super_block *es;
5300 struct ext4_sb_info *sbi = EXT4_SB(sb);
5301 unsigned long old_sb_flags;
5302 struct ext4_mount_options old_opts;
5303 int enable_quota = 0;
5304 ext4_group_t g;
5305 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
5306 int err = 0;
5307 #ifdef CONFIG_QUOTA
5308 int i, j;
5309 char *to_free[EXT4_MAXQUOTAS];
5310 #endif
5311 char *orig_data = kstrdup(data, GFP_KERNEL);
5312
5313 if (data && !orig_data)
5314 return -ENOMEM;
5315
5316
5317 old_sb_flags = sb->s_flags;
5318 old_opts.s_mount_opt = sbi->s_mount_opt;
5319 old_opts.s_mount_opt2 = sbi->s_mount_opt2;
5320 old_opts.s_resuid = sbi->s_resuid;
5321 old_opts.s_resgid = sbi->s_resgid;
5322 old_opts.s_commit_interval = sbi->s_commit_interval;
5323 old_opts.s_min_batch_time = sbi->s_min_batch_time;
5324 old_opts.s_max_batch_time = sbi->s_max_batch_time;
5325 #ifdef CONFIG_QUOTA
5326 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
5327 for (i = 0; i < EXT4_MAXQUOTAS; i++)
5328 if (sbi->s_qf_names[i]) {
5329 char *qf_name = get_qf_name(sb, sbi, i);
5330
5331 old_opts.s_qf_names[i] = kstrdup(qf_name, GFP_KERNEL);
5332 if (!old_opts.s_qf_names[i]) {
5333 for (j = 0; j < i; j++)
5334 kfree(old_opts.s_qf_names[j]);
5335 kfree(orig_data);
5336 return -ENOMEM;
5337 }
5338 } else
5339 old_opts.s_qf_names[i] = NULL;
5340 #endif
5341 if (sbi->s_journal && sbi->s_journal->j_task->io_context)
5342 journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
5343
5344 if (!parse_options(data, sb, NULL, &journal_ioprio, 1)) {
5345 err = -EINVAL;
5346 goto restore_opts;
5347 }
5348
5349 if ((old_opts.s_mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) ^
5350 test_opt(sb, JOURNAL_CHECKSUM)) {
5351 ext4_msg(sb, KERN_ERR, "changing journal_checksum "
5352 "during remount not supported; ignoring");
5353 sbi->s_mount_opt ^= EXT4_MOUNT_JOURNAL_CHECKSUM;
5354 }
5355
5356 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
5357 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
5358 ext4_msg(sb, KERN_ERR, "can't mount with "
5359 "both data=journal and delalloc");
5360 err = -EINVAL;
5361 goto restore_opts;
5362 }
5363 if (test_opt(sb, DIOREAD_NOLOCK)) {
5364 ext4_msg(sb, KERN_ERR, "can't mount with "
5365 "both data=journal and dioread_nolock");
5366 err = -EINVAL;
5367 goto restore_opts;
5368 }
5369 if (test_opt(sb, DAX)) {
5370 ext4_msg(sb, KERN_ERR, "can't mount with "
5371 "both data=journal and dax");
5372 err = -EINVAL;
5373 goto restore_opts;
5374 }
5375 } else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) {
5376 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
5377 ext4_msg(sb, KERN_ERR, "can't mount with "
5378 "journal_async_commit in data=ordered mode");
5379 err = -EINVAL;
5380 goto restore_opts;
5381 }
5382 }
5383
5384 if ((sbi->s_mount_opt ^ old_opts.s_mount_opt) & EXT4_MOUNT_NO_MBCACHE) {
5385 ext4_msg(sb, KERN_ERR, "can't enable nombcache during remount");
5386 err = -EINVAL;
5387 goto restore_opts;
5388 }
5389
5390 if ((sbi->s_mount_opt ^ old_opts.s_mount_opt) & EXT4_MOUNT_DAX) {
5391 ext4_msg(sb, KERN_WARNING, "warning: refusing change of "
5392 "dax flag with busy inodes while remounting");
5393 sbi->s_mount_opt ^= EXT4_MOUNT_DAX;
5394 }
5395
5396 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
5397 ext4_abort(sb, "Abort forced by user");
5398
5399 sb->s_flags = (sb->s_flags & ~SB_POSIXACL) |
5400 (test_opt(sb, POSIX_ACL) ? SB_POSIXACL : 0);
5401
5402 es = sbi->s_es;
5403
5404 if (sbi->s_journal) {
5405 ext4_init_journal_params(sb, sbi->s_journal);
5406 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
5407 }
5408
5409 if (*flags & SB_LAZYTIME)
5410 sb->s_flags |= SB_LAZYTIME;
5411
5412 if ((bool)(*flags & SB_RDONLY) != sb_rdonly(sb)) {
5413 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) {
5414 err = -EROFS;
5415 goto restore_opts;
5416 }
5417
5418 if (*flags & SB_RDONLY) {
5419 err = sync_filesystem(sb);
5420 if (err < 0)
5421 goto restore_opts;
5422 err = dquot_suspend(sb, -1);
5423 if (err < 0)
5424 goto restore_opts;
5425
5426
5427
5428
5429
5430 sb->s_flags |= SB_RDONLY;
5431
5432
5433
5434
5435
5436
5437 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
5438 (sbi->s_mount_state & EXT4_VALID_FS))
5439 es->s_state = cpu_to_le16(sbi->s_mount_state);
5440
5441 if (sbi->s_journal)
5442 ext4_mark_recovery_complete(sb, es);
5443 if (sbi->s_mmp_tsk)
5444 kthread_stop(sbi->s_mmp_tsk);
5445 } else {
5446
5447 if (ext4_has_feature_readonly(sb) ||
5448 !ext4_feature_set_ok(sb, 0)) {
5449 err = -EROFS;
5450 goto restore_opts;
5451 }
5452
5453
5454
5455
5456 for (g = 0; g < sbi->s_groups_count; g++) {
5457 struct ext4_group_desc *gdp =
5458 ext4_get_group_desc(sb, g, NULL);
5459
5460 if (!ext4_group_desc_csum_verify(sb, g, gdp)) {
5461 ext4_msg(sb, KERN_ERR,
5462 "ext4_remount: Checksum for group %u failed (%u!=%u)",
5463 g, le16_to_cpu(ext4_group_desc_csum(sb, g, gdp)),
5464 le16_to_cpu(gdp->bg_checksum));
5465 err = -EFSBADCRC;
5466 goto restore_opts;
5467 }
5468 }
5469
5470
5471
5472
5473
5474
5475 if (es->s_last_orphan) {
5476 ext4_msg(sb, KERN_WARNING, "Couldn't "
5477 "remount RDWR because of unprocessed "
5478 "orphan inode list. Please "
5479 "umount/remount instead");
5480 err = -EINVAL;
5481 goto restore_opts;
5482 }
5483
5484
5485
5486
5487
5488
5489
5490 if (sbi->s_journal)
5491 ext4_clear_journal_err(sb, es);
5492 sbi->s_mount_state = le16_to_cpu(es->s_state);
5493
5494 err = ext4_setup_super(sb, es, 0);
5495 if (err)
5496 goto restore_opts;
5497
5498 sb->s_flags &= ~SB_RDONLY;
5499 if (ext4_has_feature_mmp(sb))
5500 if (ext4_multi_mount_protect(sb,
5501 le64_to_cpu(es->s_mmp_block))) {
5502 err = -EROFS;
5503 goto restore_opts;
5504 }
5505 enable_quota = 1;
5506 }
5507 }
5508
5509
5510
5511
5512
5513 if (sb_rdonly(sb) || !test_opt(sb, INIT_INODE_TABLE))
5514 ext4_unregister_li_request(sb);
5515 else {
5516 ext4_group_t first_not_zeroed;
5517 first_not_zeroed = ext4_has_uninit_itable(sb);
5518 ext4_register_li_request(sb, first_not_zeroed);
5519 }
5520
5521 ext4_setup_system_zone(sb);
5522 if (sbi->s_journal == NULL && !(old_sb_flags & SB_RDONLY)) {
5523 err = ext4_commit_super(sb, 1);
5524 if (err)
5525 goto restore_opts;
5526 }
5527
5528 #ifdef CONFIG_QUOTA
5529
5530 for (i = 0; i < EXT4_MAXQUOTAS; i++)
5531 kfree(old_opts.s_qf_names[i]);
5532 if (enable_quota) {
5533 if (sb_any_quota_suspended(sb))
5534 dquot_resume(sb, -1);
5535 else if (ext4_has_feature_quota(sb)) {
5536 err = ext4_enable_quotas(sb);
5537 if (err)
5538 goto restore_opts;
5539 }
5540 }
5541 #endif
5542
5543 *flags = (*flags & ~SB_LAZYTIME) | (sb->s_flags & SB_LAZYTIME);
5544 ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s", orig_data);
5545 kfree(orig_data);
5546 return 0;
5547
5548 restore_opts:
5549 sb->s_flags = old_sb_flags;
5550 sbi->s_mount_opt = old_opts.s_mount_opt;
5551 sbi->s_mount_opt2 = old_opts.s_mount_opt2;
5552 sbi->s_resuid = old_opts.s_resuid;
5553 sbi->s_resgid = old_opts.s_resgid;
5554 sbi->s_commit_interval = old_opts.s_commit_interval;
5555 sbi->s_min_batch_time = old_opts.s_min_batch_time;
5556 sbi->s_max_batch_time = old_opts.s_max_batch_time;
5557 #ifdef CONFIG_QUOTA
5558 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
5559 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
5560 to_free[i] = get_qf_name(sb, sbi, i);
5561 rcu_assign_pointer(sbi->s_qf_names[i], old_opts.s_qf_names[i]);
5562 }
5563 synchronize_rcu();
5564 for (i = 0; i < EXT4_MAXQUOTAS; i++)
5565 kfree(to_free[i]);
5566 #endif
5567 kfree(orig_data);
5568 return err;
5569 }
5570
5571 #ifdef CONFIG_QUOTA
5572 static int ext4_statfs_project(struct super_block *sb,
5573 kprojid_t projid, struct kstatfs *buf)
5574 {
5575 struct kqid qid;
5576 struct dquot *dquot;
5577 u64 limit;
5578 u64 curblock;
5579
5580 qid = make_kqid_projid(projid);
5581 dquot = dqget(sb, qid);
5582 if (IS_ERR(dquot))
5583 return PTR_ERR(dquot);
5584 spin_lock(&dquot->dq_dqb_lock);
5585
5586 limit = 0;
5587 if (dquot->dq_dqb.dqb_bsoftlimit &&
5588 (!limit || dquot->dq_dqb.dqb_bsoftlimit < limit))
5589 limit = dquot->dq_dqb.dqb_bsoftlimit;
5590 if (dquot->dq_dqb.dqb_bhardlimit &&
5591 (!limit || dquot->dq_dqb.dqb_bhardlimit < limit))
5592 limit = dquot->dq_dqb.dqb_bhardlimit;
5593 limit >>= sb->s_blocksize_bits;
5594
5595 if (limit && buf->f_blocks > limit) {
5596 curblock = (dquot->dq_dqb.dqb_curspace +
5597 dquot->dq_dqb.dqb_rsvspace) >> sb->s_blocksize_bits;
5598 buf->f_blocks = limit;
5599 buf->f_bfree = buf->f_bavail =
5600 (buf->f_blocks > curblock) ?
5601 (buf->f_blocks - curblock) : 0;
5602 }
5603
5604 limit = 0;
5605 if (dquot->dq_dqb.dqb_isoftlimit &&
5606 (!limit || dquot->dq_dqb.dqb_isoftlimit < limit))
5607 limit = dquot->dq_dqb.dqb_isoftlimit;
5608 if (dquot->dq_dqb.dqb_ihardlimit &&
5609 (!limit || dquot->dq_dqb.dqb_ihardlimit < limit))
5610 limit = dquot->dq_dqb.dqb_ihardlimit;
5611
5612 if (limit && buf->f_files > limit) {
5613 buf->f_files = limit;
5614 buf->f_ffree =
5615 (buf->f_files > dquot->dq_dqb.dqb_curinodes) ?
5616 (buf->f_files - dquot->dq_dqb.dqb_curinodes) : 0;
5617 }
5618
5619 spin_unlock(&dquot->dq_dqb_lock);
5620 dqput(dquot);
5621 return 0;
5622 }
5623 #endif
5624
5625 static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
5626 {
5627 struct super_block *sb = dentry->d_sb;
5628 struct ext4_sb_info *sbi = EXT4_SB(sb);
5629 struct ext4_super_block *es = sbi->s_es;
5630 ext4_fsblk_t overhead = 0, resv_blocks;
5631 u64 fsid;
5632 s64 bfree;
5633 resv_blocks = EXT4_C2B(sbi, atomic64_read(&sbi->s_resv_clusters));
5634
5635 if (!test_opt(sb, MINIX_DF))
5636 overhead = sbi->s_overhead;
5637
5638 buf->f_type = EXT4_SUPER_MAGIC;
5639 buf->f_bsize = sb->s_blocksize;
5640 buf->f_blocks = ext4_blocks_count(es) - EXT4_C2B(sbi, overhead);
5641 bfree = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) -
5642 percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter);
5643
5644 buf->f_bfree = EXT4_C2B(sbi, max_t(s64, bfree, 0));
5645 buf->f_bavail = buf->f_bfree -
5646 (ext4_r_blocks_count(es) + resv_blocks);
5647 if (buf->f_bfree < (ext4_r_blocks_count(es) + resv_blocks))
5648 buf->f_bavail = 0;
5649 buf->f_files = le32_to_cpu(es->s_inodes_count);
5650 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
5651 buf->f_namelen = EXT4_NAME_LEN;
5652 fsid = le64_to_cpup((void *)es->s_uuid) ^
5653 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
5654 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
5655 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
5656
5657 #ifdef CONFIG_QUOTA
5658 if (ext4_test_inode_flag(dentry->d_inode, EXT4_INODE_PROJINHERIT) &&
5659 sb_has_quota_limits_enabled(sb, PRJQUOTA))
5660 ext4_statfs_project(sb, EXT4_I(dentry->d_inode)->i_projid, buf);
5661 #endif
5662 return 0;
5663 }
5664
5665
5666 #ifdef CONFIG_QUOTA
5667
5668
5669
5670
5671
5672 static inline struct inode *dquot_to_inode(struct dquot *dquot)
5673 {
5674 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_id.type];
5675 }
5676
5677 static int ext4_write_dquot(struct dquot *dquot)
5678 {
5679 int ret, err;
5680 handle_t *handle;
5681 struct inode *inode;
5682
5683 inode = dquot_to_inode(dquot);
5684 handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
5685 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
5686 if (IS_ERR(handle))
5687 return PTR_ERR(handle);
5688 ret = dquot_commit(dquot);
5689 err = ext4_journal_stop(handle);
5690 if (!ret)
5691 ret = err;
5692 return ret;
5693 }
5694
5695 static int ext4_acquire_dquot(struct dquot *dquot)
5696 {
5697 int ret, err;
5698 handle_t *handle;
5699
5700 handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
5701 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
5702 if (IS_ERR(handle))
5703 return PTR_ERR(handle);
5704 ret = dquot_acquire(dquot);
5705 err = ext4_journal_stop(handle);
5706 if (!ret)
5707 ret = err;
5708 return ret;
5709 }
5710
5711 static int ext4_release_dquot(struct dquot *dquot)
5712 {
5713 int ret, err;
5714 handle_t *handle;
5715
5716 handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
5717 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
5718 if (IS_ERR(handle)) {
5719
5720 dquot_release(dquot);
5721 return PTR_ERR(handle);
5722 }
5723 ret = dquot_release(dquot);
5724 err = ext4_journal_stop(handle);
5725 if (!ret)
5726 ret = err;
5727 return ret;
5728 }
5729
5730 static int ext4_mark_dquot_dirty(struct dquot *dquot)
5731 {
5732 struct super_block *sb = dquot->dq_sb;
5733 struct ext4_sb_info *sbi = EXT4_SB(sb);
5734
5735
5736 if (ext4_has_feature_quota(sb) ||
5737 sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
5738 dquot_mark_dquot_dirty(dquot);
5739 return ext4_write_dquot(dquot);
5740 } else {
5741 return dquot_mark_dquot_dirty(dquot);
5742 }
5743 }
5744
5745 static int ext4_write_info(struct super_block *sb, int type)
5746 {
5747 int ret, err;
5748 handle_t *handle;
5749
5750
5751 handle = ext4_journal_start(d_inode(sb->s_root), EXT4_HT_QUOTA, 2);
5752 if (IS_ERR(handle))
5753 return PTR_ERR(handle);
5754 ret = dquot_commit_info(sb, type);
5755 err = ext4_journal_stop(handle);
5756 if (!ret)
5757 ret = err;
5758 return ret;
5759 }
5760
5761
5762
5763
5764
5765 static int ext4_quota_on_mount(struct super_block *sb, int type)
5766 {
5767 return dquot_quota_on_mount(sb, get_qf_name(sb, EXT4_SB(sb), type),
5768 EXT4_SB(sb)->s_jquota_fmt, type);
5769 }
5770
5771 static void lockdep_set_quota_inode(struct inode *inode, int subclass)
5772 {
5773 struct ext4_inode_info *ei = EXT4_I(inode);
5774
5775
5776
5777
5778
5779
5780
5781 (void) ei;
5782 lockdep_set_subclass(&ei->i_data_sem, subclass);
5783 }
5784
5785
5786
5787
5788 static int ext4_quota_on(struct super_block *sb, int type, int format_id,
5789 const struct path *path)
5790 {
5791 int err;
5792
5793 if (!test_opt(sb, QUOTA))
5794 return -EINVAL;
5795
5796
5797 if (path->dentry->d_sb != sb)
5798 return -EXDEV;
5799
5800 if (EXT4_SB(sb)->s_qf_names[type]) {
5801
5802 if (path->dentry->d_parent != sb->s_root)
5803 ext4_msg(sb, KERN_WARNING,
5804 "Quota file not on filesystem root. "
5805 "Journaled quota will not work");
5806 sb_dqopt(sb)->flags |= DQUOT_NOLIST_DIRTY;
5807 } else {
5808
5809
5810
5811
5812 sb_dqopt(sb)->flags &= ~DQUOT_NOLIST_DIRTY;
5813 }
5814
5815
5816
5817
5818
5819 if (EXT4_SB(sb)->s_journal &&
5820 ext4_should_journal_data(d_inode(path->dentry))) {
5821
5822
5823
5824
5825 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
5826 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
5827 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
5828 if (err)
5829 return err;
5830 }
5831
5832 lockdep_set_quota_inode(path->dentry->d_inode, I_DATA_SEM_QUOTA);
5833 err = dquot_quota_on(sb, type, format_id, path);
5834 if (err) {
5835 lockdep_set_quota_inode(path->dentry->d_inode,
5836 I_DATA_SEM_NORMAL);
5837 } else {
5838 struct inode *inode = d_inode(path->dentry);
5839 handle_t *handle;
5840
5841
5842
5843
5844
5845
5846 inode_lock(inode);
5847 handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1);
5848 if (IS_ERR(handle))
5849 goto unlock_inode;
5850 EXT4_I(inode)->i_flags |= EXT4_NOATIME_FL | EXT4_IMMUTABLE_FL;
5851 inode_set_flags(inode, S_NOATIME | S_IMMUTABLE,
5852 S_NOATIME | S_IMMUTABLE);
5853 ext4_mark_inode_dirty(handle, inode);
5854 ext4_journal_stop(handle);
5855 unlock_inode:
5856 inode_unlock(inode);
5857 }
5858 return err;
5859 }
5860
5861 static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
5862 unsigned int flags)
5863 {
5864 int err;
5865 struct inode *qf_inode;
5866 unsigned long qf_inums[EXT4_MAXQUOTAS] = {
5867 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
5868 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum),
5869 le32_to_cpu(EXT4_SB(sb)->s_es->s_prj_quota_inum)
5870 };
5871
5872 BUG_ON(!ext4_has_feature_quota(sb));
5873
5874 if (!qf_inums[type])
5875 return -EPERM;
5876
5877 qf_inode = ext4_iget(sb, qf_inums[type], EXT4_IGET_SPECIAL);
5878 if (IS_ERR(qf_inode)) {
5879 ext4_error(sb, "Bad quota inode # %lu", qf_inums[type]);
5880 return PTR_ERR(qf_inode);
5881 }
5882
5883
5884 qf_inode->i_flags |= S_NOQUOTA;
5885 lockdep_set_quota_inode(qf_inode, I_DATA_SEM_QUOTA);
5886 err = dquot_enable(qf_inode, type, format_id, flags);
5887 if (err)
5888 lockdep_set_quota_inode(qf_inode, I_DATA_SEM_NORMAL);
5889 iput(qf_inode);
5890
5891 return err;
5892 }
5893
5894
5895 static int ext4_enable_quotas(struct super_block *sb)
5896 {
5897 int type, err = 0;
5898 unsigned long qf_inums[EXT4_MAXQUOTAS] = {
5899 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
5900 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum),
5901 le32_to_cpu(EXT4_SB(sb)->s_es->s_prj_quota_inum)
5902 };
5903 bool quota_mopt[EXT4_MAXQUOTAS] = {
5904 test_opt(sb, USRQUOTA),
5905 test_opt(sb, GRPQUOTA),
5906 test_opt(sb, PRJQUOTA),
5907 };
5908
5909 sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE | DQUOT_NOLIST_DIRTY;
5910 for (type = 0; type < EXT4_MAXQUOTAS; type++) {
5911 if (qf_inums[type]) {
5912 err = ext4_quota_enable(sb, type, QFMT_VFS_V1,
5913 DQUOT_USAGE_ENABLED |
5914 (quota_mopt[type] ? DQUOT_LIMITS_ENABLED : 0));
5915 if (err) {
5916 ext4_warning(sb,
5917 "Failed to enable quota tracking "
5918 "(type=%d, err=%d). Please run "
5919 "e2fsck to fix.", type, err);
5920 for (type--; type >= 0; type--)
5921 dquot_quota_off(sb, type);
5922
5923 return err;
5924 }
5925 }
5926 }
5927 return 0;
5928 }
5929
5930 static int ext4_quota_off(struct super_block *sb, int type)
5931 {
5932 struct inode *inode = sb_dqopt(sb)->files[type];
5933 handle_t *handle;
5934 int err;
5935
5936
5937
5938 if (test_opt(sb, DELALLOC))
5939 sync_filesystem(sb);
5940
5941 if (!inode || !igrab(inode))
5942 goto out;
5943
5944 err = dquot_quota_off(sb, type);
5945 if (err || ext4_has_feature_quota(sb))
5946 goto out_put;
5947
5948 inode_lock(inode);
5949
5950
5951
5952
5953
5954 handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1);
5955 if (IS_ERR(handle))
5956 goto out_unlock;
5957 EXT4_I(inode)->i_flags &= ~(EXT4_NOATIME_FL | EXT4_IMMUTABLE_FL);
5958 inode_set_flags(inode, 0, S_NOATIME | S_IMMUTABLE);
5959 inode->i_mtime = inode->i_ctime = current_time(inode);
5960 ext4_mark_inode_dirty(handle, inode);
5961 ext4_journal_stop(handle);
5962 out_unlock:
5963 inode_unlock(inode);
5964 out_put:
5965 lockdep_set_quota_inode(inode, I_DATA_SEM_NORMAL);
5966 iput(inode);
5967 return err;
5968 out:
5969 return dquot_quota_off(sb, type);
5970 }
5971
5972
5973
5974
5975
5976 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
5977 size_t len, loff_t off)
5978 {
5979 struct inode *inode = sb_dqopt(sb)->files[type];
5980 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
5981 int offset = off & (sb->s_blocksize - 1);
5982 int tocopy;
5983 size_t toread;
5984 struct buffer_head *bh;
5985 loff_t i_size = i_size_read(inode);
5986
5987 if (off > i_size)
5988 return 0;
5989 if (off+len > i_size)
5990 len = i_size-off;
5991 toread = len;
5992 while (toread > 0) {
5993 tocopy = sb->s_blocksize - offset < toread ?
5994 sb->s_blocksize - offset : toread;
5995 bh = ext4_bread(NULL, inode, blk, 0);
5996 if (IS_ERR(bh))
5997 return PTR_ERR(bh);
5998 if (!bh)
5999 memset(data, 0, tocopy);
6000 else
6001 memcpy(data, bh->b_data+offset, tocopy);
6002 brelse(bh);
6003 offset = 0;
6004 toread -= tocopy;
6005 data += tocopy;
6006 blk++;
6007 }
6008 return len;
6009 }
6010
6011
6012
6013 static ssize_t ext4_quota_write(struct super_block *sb, int type,
6014 const char *data, size_t len, loff_t off)
6015 {
6016 struct inode *inode = sb_dqopt(sb)->files[type];
6017 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
6018 int err, offset = off & (sb->s_blocksize - 1);
6019 int retries = 0;
6020 struct buffer_head *bh;
6021 handle_t *handle = journal_current_handle();
6022
6023 if (EXT4_SB(sb)->s_journal && !handle) {
6024 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
6025 " cancelled because transaction is not started",
6026 (unsigned long long)off, (unsigned long long)len);
6027 return -EIO;
6028 }
6029
6030
6031
6032
6033 if (sb->s_blocksize - offset < len) {
6034 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
6035 " cancelled because not block aligned",
6036 (unsigned long long)off, (unsigned long long)len);
6037 return -EIO;
6038 }
6039
6040 do {
6041 bh = ext4_bread(handle, inode, blk,
6042 EXT4_GET_BLOCKS_CREATE |
6043 EXT4_GET_BLOCKS_METADATA_NOFAIL);
6044 } while (IS_ERR(bh) && (PTR_ERR(bh) == -ENOSPC) &&
6045 ext4_should_retry_alloc(inode->i_sb, &retries));
6046 if (IS_ERR(bh))
6047 return PTR_ERR(bh);
6048 if (!bh)
6049 goto out;
6050 BUFFER_TRACE(bh, "get write access");
6051 err = ext4_journal_get_write_access(handle, bh);
6052 if (err) {
6053 brelse(bh);
6054 return err;
6055 }
6056 lock_buffer(bh);
6057 memcpy(bh->b_data+offset, data, len);
6058 flush_dcache_page(bh->b_page);
6059 unlock_buffer(bh);
6060 err = ext4_handle_dirty_metadata(handle, NULL, bh);
6061 brelse(bh);
6062 out:
6063 if (inode->i_size < off + len) {
6064 i_size_write(inode, off + len);
6065 EXT4_I(inode)->i_disksize = inode->i_size;
6066 ext4_mark_inode_dirty(handle, inode);
6067 }
6068 return len;
6069 }
6070
6071 static int ext4_get_next_id(struct super_block *sb, struct kqid *qid)
6072 {
6073 const struct quota_format_ops *ops;
6074
6075 if (!sb_has_quota_loaded(sb, qid->type))
6076 return -ESRCH;
6077 ops = sb_dqopt(sb)->ops[qid->type];
6078 if (!ops || !ops->get_next_id)
6079 return -ENOSYS;
6080 return dquot_get_next_id(sb, qid);
6081 }
6082 #endif
6083
6084 static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
6085 const char *dev_name, void *data)
6086 {
6087 return mount_bdev(fs_type, flags, dev_name, data, ext4_fill_super);
6088 }
6089
6090 #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2)
6091 static inline void register_as_ext2(void)
6092 {
6093 int err = register_filesystem(&ext2_fs_type);
6094 if (err)
6095 printk(KERN_WARNING
6096 "EXT4-fs: Unable to register as ext2 (%d)\n", err);
6097 }
6098
6099 static inline void unregister_as_ext2(void)
6100 {
6101 unregister_filesystem(&ext2_fs_type);
6102 }
6103
6104 static inline int ext2_feature_set_ok(struct super_block *sb)
6105 {
6106 if (ext4_has_unknown_ext2_incompat_features(sb))
6107 return 0;
6108 if (sb_rdonly(sb))
6109 return 1;
6110 if (ext4_has_unknown_ext2_ro_compat_features(sb))
6111 return 0;
6112 return 1;
6113 }
6114 #else
6115 static inline void register_as_ext2(void) { }
6116 static inline void unregister_as_ext2(void) { }
6117 static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; }
6118 #endif
6119
6120 static inline void register_as_ext3(void)
6121 {
6122 int err = register_filesystem(&ext3_fs_type);
6123 if (err)
6124 printk(KERN_WARNING
6125 "EXT4-fs: Unable to register as ext3 (%d)\n", err);
6126 }
6127
6128 static inline void unregister_as_ext3(void)
6129 {
6130 unregister_filesystem(&ext3_fs_type);
6131 }
6132
6133 static inline int ext3_feature_set_ok(struct super_block *sb)
6134 {
6135 if (ext4_has_unknown_ext3_incompat_features(sb))
6136 return 0;
6137 if (!ext4_has_feature_journal(sb))
6138 return 0;
6139 if (sb_rdonly(sb))
6140 return 1;
6141 if (ext4_has_unknown_ext3_ro_compat_features(sb))
6142 return 0;
6143 return 1;
6144 }
6145
6146 static struct file_system_type ext4_fs_type = {
6147 .owner = THIS_MODULE,
6148 .name = "ext4",
6149 .mount = ext4_mount,
6150 .kill_sb = kill_block_super,
6151 .fs_flags = FS_REQUIRES_DEV,
6152 };
6153 MODULE_ALIAS_FS("ext4");
6154
6155
6156 wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
6157
6158 static int __init ext4_init_fs(void)
6159 {
6160 int i, err;
6161
6162 ratelimit_state_init(&ext4_mount_msg_ratelimit, 30 * HZ, 64);
6163 ext4_li_info = NULL;
6164 mutex_init(&ext4_li_mtx);
6165
6166
6167 ext4_check_flag_values();
6168
6169 for (i = 0; i < EXT4_WQ_HASH_SZ; i++)
6170 init_waitqueue_head(&ext4__ioend_wq[i]);
6171
6172 err = ext4_init_es();
6173 if (err)
6174 return err;
6175
6176 err = ext4_init_pending();
6177 if (err)
6178 goto out7;
6179
6180 err = ext4_init_post_read_processing();
6181 if (err)
6182 goto out6;
6183
6184 err = ext4_init_pageio();
6185 if (err)
6186 goto out5;
6187
6188 err = ext4_init_system_zone();
6189 if (err)
6190 goto out4;
6191
6192 err = ext4_init_sysfs();
6193 if (err)
6194 goto out3;
6195
6196 err = ext4_init_mballoc();
6197 if (err)
6198 goto out2;
6199 err = init_inodecache();
6200 if (err)
6201 goto out1;
6202 register_as_ext3();
6203 register_as_ext2();
6204 err = register_filesystem(&ext4_fs_type);
6205 if (err)
6206 goto out;
6207
6208 return 0;
6209 out:
6210 unregister_as_ext2();
6211 unregister_as_ext3();
6212 destroy_inodecache();
6213 out1:
6214 ext4_exit_mballoc();
6215 out2:
6216 ext4_exit_sysfs();
6217 out3:
6218 ext4_exit_system_zone();
6219 out4:
6220 ext4_exit_pageio();
6221 out5:
6222 ext4_exit_post_read_processing();
6223 out6:
6224 ext4_exit_pending();
6225 out7:
6226 ext4_exit_es();
6227
6228 return err;
6229 }
6230
6231 static void __exit ext4_exit_fs(void)
6232 {
6233 ext4_destroy_lazyinit_thread();
6234 unregister_as_ext2();
6235 unregister_as_ext3();
6236 unregister_filesystem(&ext4_fs_type);
6237 destroy_inodecache();
6238 ext4_exit_mballoc();
6239 ext4_exit_sysfs();
6240 ext4_exit_system_zone();
6241 ext4_exit_pageio();
6242 ext4_exit_post_read_processing();
6243 ext4_exit_es();
6244 ext4_exit_pending();
6245 }
6246
6247 MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
6248 MODULE_DESCRIPTION("Fourth Extended Filesystem");
6249 MODULE_LICENSE("GPL");
6250 MODULE_SOFTDEP("pre: crc32c");
6251 module_init(ext4_init_fs)
6252 module_exit(ext4_exit_fs)