8ab650b1aa1e3e4cd896ede357e92eb05fbffa8e
[~shefty/rdma-dev.git] / fs / ext4 / super.c
1 /*
2  *  linux/fs/ext4/super.c
3  *
4  * Copyright (C) 1992, 1993, 1994, 1995
5  * Remy Card (card@masi.ibp.fr)
6  * Laboratoire MASI - Institut Blaise Pascal
7  * Universite Pierre et Marie Curie (Paris VI)
8  *
9  *  from
10  *
11  *  linux/fs/minix/inode.c
12  *
13  *  Copyright (C) 1991, 1992  Linus Torvalds
14  *
15  *  Big-endian to little-endian byte-swapping/bitmaps by
16  *        David S. Miller (davem@caip.rutgers.edu), 1995
17  */
18
19 #include <linux/module.h>
20 #include <linux/string.h>
21 #include <linux/fs.h>
22 #include <linux/time.h>
23 #include <linux/vmalloc.h>
24 #include <linux/jbd2.h>
25 #include <linux/slab.h>
26 #include <linux/init.h>
27 #include <linux/blkdev.h>
28 #include <linux/parser.h>
29 #include <linux/buffer_head.h>
30 #include <linux/exportfs.h>
31 #include <linux/vfs.h>
32 #include <linux/random.h>
33 #include <linux/mount.h>
34 #include <linux/namei.h>
35 #include <linux/quotaops.h>
36 #include <linux/seq_file.h>
37 #include <linux/proc_fs.h>
38 #include <linux/ctype.h>
39 #include <linux/log2.h>
40 #include <linux/crc16.h>
41 #include <linux/cleancache.h>
42 #include <asm/uaccess.h>
43
44 #include <linux/kthread.h>
45 #include <linux/freezer.h>
46
47 #include "ext4.h"
48 #include "ext4_extents.h"
49 #include "ext4_jbd2.h"
50 #include "xattr.h"
51 #include "acl.h"
52 #include "mballoc.h"
53
54 #define CREATE_TRACE_POINTS
55 #include <trace/events/ext4.h>
56
57 static struct proc_dir_entry *ext4_proc_root;
58 static struct kset *ext4_kset;
59 static struct ext4_lazy_init *ext4_li_info;
60 static struct mutex ext4_li_mtx;
61 static struct ext4_features *ext4_feat;
62
63 static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
64                              unsigned long journal_devnum);
65 static int ext4_show_options(struct seq_file *seq, struct dentry *root);
66 static int ext4_commit_super(struct super_block *sb, int sync);
67 static void ext4_mark_recovery_complete(struct super_block *sb,
68                                         struct ext4_super_block *es);
69 static void ext4_clear_journal_err(struct super_block *sb,
70                                    struct ext4_super_block *es);
71 static int ext4_sync_fs(struct super_block *sb, int wait);
72 static const char *ext4_decode_error(struct super_block *sb, int errno,
73                                      char nbuf[16]);
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
87 #if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
88 static struct file_system_type ext2_fs_type = {
89         .owner          = THIS_MODULE,
90         .name           = "ext2",
91         .mount          = ext4_mount,
92         .kill_sb        = kill_block_super,
93         .fs_flags       = FS_REQUIRES_DEV,
94 };
95 #define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type)
96 #else
97 #define IS_EXT2_SB(sb) (0)
98 #endif
99
100
101 #if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
102 static struct file_system_type ext3_fs_type = {
103         .owner          = THIS_MODULE,
104         .name           = "ext3",
105         .mount          = ext4_mount,
106         .kill_sb        = kill_block_super,
107         .fs_flags       = FS_REQUIRES_DEV,
108 };
109 #define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type)
110 #else
111 #define IS_EXT3_SB(sb) (0)
112 #endif
113
114 static int ext4_verify_csum_type(struct super_block *sb,
115                                  struct ext4_super_block *es)
116 {
117         if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
118                                         EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
119                 return 1;
120
121         return es->s_checksum_type == EXT4_CRC32C_CHKSUM;
122 }
123
124 static __le32 ext4_superblock_csum(struct super_block *sb,
125                                    struct ext4_super_block *es)
126 {
127         struct ext4_sb_info *sbi = EXT4_SB(sb);
128         int offset = offsetof(struct ext4_super_block, s_checksum);
129         __u32 csum;
130
131         csum = ext4_chksum(sbi, ~0, (char *)es, offset);
132
133         return cpu_to_le32(csum);
134 }
135
136 int ext4_superblock_csum_verify(struct super_block *sb,
137                                 struct ext4_super_block *es)
138 {
139         if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
140                                        EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
141                 return 1;
142
143         return es->s_checksum == ext4_superblock_csum(sb, es);
144 }
145
146 void ext4_superblock_csum_set(struct super_block *sb)
147 {
148         struct ext4_super_block *es = EXT4_SB(sb)->s_es;
149
150         if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
151                 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
152                 return;
153
154         es->s_checksum = ext4_superblock_csum(sb, es);
155 }
156
157 void *ext4_kvmalloc(size_t size, gfp_t flags)
158 {
159         void *ret;
160
161         ret = kmalloc(size, flags);
162         if (!ret)
163                 ret = __vmalloc(size, flags, PAGE_KERNEL);
164         return ret;
165 }
166
167 void *ext4_kvzalloc(size_t size, gfp_t flags)
168 {
169         void *ret;
170
171         ret = kzalloc(size, flags);
172         if (!ret)
173                 ret = __vmalloc(size, flags | __GFP_ZERO, PAGE_KERNEL);
174         return ret;
175 }
176
177 void ext4_kvfree(void *ptr)
178 {
179         if (is_vmalloc_addr(ptr))
180                 vfree(ptr);
181         else
182                 kfree(ptr);
183
184 }
185
186 ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
187                                struct ext4_group_desc *bg)
188 {
189         return le32_to_cpu(bg->bg_block_bitmap_lo) |
190                 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
191                  (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
192 }
193
194 ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
195                                struct ext4_group_desc *bg)
196 {
197         return le32_to_cpu(bg->bg_inode_bitmap_lo) |
198                 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
199                  (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
200 }
201
202 ext4_fsblk_t ext4_inode_table(struct super_block *sb,
203                               struct ext4_group_desc *bg)
204 {
205         return le32_to_cpu(bg->bg_inode_table_lo) |
206                 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
207                  (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
208 }
209
210 __u32 ext4_free_group_clusters(struct super_block *sb,
211                                struct ext4_group_desc *bg)
212 {
213         return le16_to_cpu(bg->bg_free_blocks_count_lo) |
214                 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
215                  (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0);
216 }
217
218 __u32 ext4_free_inodes_count(struct super_block *sb,
219                               struct ext4_group_desc *bg)
220 {
221         return le16_to_cpu(bg->bg_free_inodes_count_lo) |
222                 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
223                  (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0);
224 }
225
226 __u32 ext4_used_dirs_count(struct super_block *sb,
227                               struct ext4_group_desc *bg)
228 {
229         return le16_to_cpu(bg->bg_used_dirs_count_lo) |
230                 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
231                  (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0);
232 }
233
234 __u32 ext4_itable_unused_count(struct super_block *sb,
235                               struct ext4_group_desc *bg)
236 {
237         return le16_to_cpu(bg->bg_itable_unused_lo) |
238                 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
239                  (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0);
240 }
241
242 void ext4_block_bitmap_set(struct super_block *sb,
243                            struct ext4_group_desc *bg, ext4_fsblk_t blk)
244 {
245         bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
246         if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
247                 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
248 }
249
250 void ext4_inode_bitmap_set(struct super_block *sb,
251                            struct ext4_group_desc *bg, ext4_fsblk_t blk)
252 {
253         bg->bg_inode_bitmap_lo  = cpu_to_le32((u32)blk);
254         if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
255                 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
256 }
257
258 void ext4_inode_table_set(struct super_block *sb,
259                           struct ext4_group_desc *bg, ext4_fsblk_t blk)
260 {
261         bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
262         if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
263                 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
264 }
265
266 void ext4_free_group_clusters_set(struct super_block *sb,
267                                   struct ext4_group_desc *bg, __u32 count)
268 {
269         bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count);
270         if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
271                 bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16);
272 }
273
274 void ext4_free_inodes_set(struct super_block *sb,
275                           struct ext4_group_desc *bg, __u32 count)
276 {
277         bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count);
278         if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
279                 bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16);
280 }
281
282 void ext4_used_dirs_set(struct super_block *sb,
283                           struct ext4_group_desc *bg, __u32 count)
284 {
285         bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count);
286         if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
287                 bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16);
288 }
289
290 void ext4_itable_unused_set(struct super_block *sb,
291                           struct ext4_group_desc *bg, __u32 count)
292 {
293         bg->bg_itable_unused_lo = cpu_to_le16((__u16)count);
294         if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
295                 bg->bg_itable_unused_hi = cpu_to_le16(count >> 16);
296 }
297
298
299 /* Just increment the non-pointer handle value */
300 static handle_t *ext4_get_nojournal(void)
301 {
302         handle_t *handle = current->journal_info;
303         unsigned long ref_cnt = (unsigned long)handle;
304
305         BUG_ON(ref_cnt >= EXT4_NOJOURNAL_MAX_REF_COUNT);
306
307         ref_cnt++;
308         handle = (handle_t *)ref_cnt;
309
310         current->journal_info = handle;
311         return handle;
312 }
313
314
315 /* Decrement the non-pointer handle value */
316 static void ext4_put_nojournal(handle_t *handle)
317 {
318         unsigned long ref_cnt = (unsigned long)handle;
319
320         BUG_ON(ref_cnt == 0);
321
322         ref_cnt--;
323         handle = (handle_t *)ref_cnt;
324
325         current->journal_info = handle;
326 }
327
328 /*
329  * Wrappers for jbd2_journal_start/end.
330  *
331  * The only special thing we need to do here is to make sure that all
332  * journal_end calls result in the superblock being marked dirty, so
333  * that sync() will call the filesystem's write_super callback if
334  * appropriate.
335  */
336 handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks)
337 {
338         journal_t *journal;
339
340         trace_ext4_journal_start(sb, nblocks, _RET_IP_);
341         if (sb->s_flags & MS_RDONLY)
342                 return ERR_PTR(-EROFS);
343
344         WARN_ON(sb->s_writers.frozen == SB_FREEZE_COMPLETE);
345         journal = EXT4_SB(sb)->s_journal;
346         if (!journal)
347                 return ext4_get_nojournal();
348         /*
349          * Special case here: if the journal has aborted behind our
350          * backs (eg. EIO in the commit thread), then we still need to
351          * take the FS itself readonly cleanly.
352          */
353         if (is_journal_aborted(journal)) {
354                 ext4_abort(sb, "Detected aborted journal");
355                 return ERR_PTR(-EROFS);
356         }
357         return jbd2_journal_start(journal, nblocks);
358 }
359
360 /*
361  * The only special thing we need to do here is to make sure that all
362  * jbd2_journal_stop calls result in the superblock being marked dirty, so
363  * that sync() will call the filesystem's write_super callback if
364  * appropriate.
365  */
366 int __ext4_journal_stop(const char *where, unsigned int line, handle_t *handle)
367 {
368         struct super_block *sb;
369         int err;
370         int rc;
371
372         if (!ext4_handle_valid(handle)) {
373                 ext4_put_nojournal(handle);
374                 return 0;
375         }
376         sb = handle->h_transaction->t_journal->j_private;
377         err = handle->h_err;
378         rc = jbd2_journal_stop(handle);
379
380         if (!err)
381                 err = rc;
382         if (err)
383                 __ext4_std_error(sb, where, line, err);
384         return err;
385 }
386
387 void ext4_journal_abort_handle(const char *caller, unsigned int line,
388                                const char *err_fn, struct buffer_head *bh,
389                                handle_t *handle, int err)
390 {
391         char nbuf[16];
392         const char *errstr = ext4_decode_error(NULL, err, nbuf);
393
394         BUG_ON(!ext4_handle_valid(handle));
395
396         if (bh)
397                 BUFFER_TRACE(bh, "abort");
398
399         if (!handle->h_err)
400                 handle->h_err = err;
401
402         if (is_handle_aborted(handle))
403                 return;
404
405         printk(KERN_ERR "EXT4-fs: %s:%d: aborting transaction: %s in %s\n",
406                caller, line, errstr, err_fn);
407
408         jbd2_journal_abort_handle(handle);
409 }
410
411 static void __save_error_info(struct super_block *sb, const char *func,
412                             unsigned int line)
413 {
414         struct ext4_super_block *es = EXT4_SB(sb)->s_es;
415
416         EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
417         es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
418         es->s_last_error_time = cpu_to_le32(get_seconds());
419         strncpy(es->s_last_error_func, func, sizeof(es->s_last_error_func));
420         es->s_last_error_line = cpu_to_le32(line);
421         if (!es->s_first_error_time) {
422                 es->s_first_error_time = es->s_last_error_time;
423                 strncpy(es->s_first_error_func, func,
424                         sizeof(es->s_first_error_func));
425                 es->s_first_error_line = cpu_to_le32(line);
426                 es->s_first_error_ino = es->s_last_error_ino;
427                 es->s_first_error_block = es->s_last_error_block;
428         }
429         /*
430          * Start the daily error reporting function if it hasn't been
431          * started already
432          */
433         if (!es->s_error_count)
434                 mod_timer(&EXT4_SB(sb)->s_err_report, jiffies + 24*60*60*HZ);
435         le32_add_cpu(&es->s_error_count, 1);
436 }
437
438 static void save_error_info(struct super_block *sb, const char *func,
439                             unsigned int line)
440 {
441         __save_error_info(sb, func, line);
442         ext4_commit_super(sb, 1);
443 }
444
445 /*
446  * The del_gendisk() function uninitializes the disk-specific data
447  * structures, including the bdi structure, without telling anyone
448  * else.  Once this happens, any attempt to call mark_buffer_dirty()
449  * (for example, by ext4_commit_super), will cause a kernel OOPS.
450  * This is a kludge to prevent these oops until we can put in a proper
451  * hook in del_gendisk() to inform the VFS and file system layers.
452  */
453 static int block_device_ejected(struct super_block *sb)
454 {
455         struct inode *bd_inode = sb->s_bdev->bd_inode;
456         struct backing_dev_info *bdi = bd_inode->i_mapping->backing_dev_info;
457
458         return bdi->dev == NULL;
459 }
460
461 static void ext4_journal_commit_callback(journal_t *journal, transaction_t *txn)
462 {
463         struct super_block              *sb = journal->j_private;
464         struct ext4_sb_info             *sbi = EXT4_SB(sb);
465         int                             error = is_journal_aborted(journal);
466         struct ext4_journal_cb_entry    *jce, *tmp;
467
468         spin_lock(&sbi->s_md_lock);
469         list_for_each_entry_safe(jce, tmp, &txn->t_private_list, jce_list) {
470                 list_del_init(&jce->jce_list);
471                 spin_unlock(&sbi->s_md_lock);
472                 jce->jce_func(sb, jce, error);
473                 spin_lock(&sbi->s_md_lock);
474         }
475         spin_unlock(&sbi->s_md_lock);
476 }
477
478 /* Deal with the reporting of failure conditions on a filesystem such as
479  * inconsistencies detected or read IO failures.
480  *
481  * On ext2, we can store the error state of the filesystem in the
482  * superblock.  That is not possible on ext4, because we may have other
483  * write ordering constraints on the superblock which prevent us from
484  * writing it out straight away; and given that the journal is about to
485  * be aborted, we can't rely on the current, or future, transactions to
486  * write out the superblock safely.
487  *
488  * We'll just use the jbd2_journal_abort() error code to record an error in
489  * the journal instead.  On recovery, the journal will complain about
490  * that error until we've noted it down and cleared it.
491  */
492
493 static void ext4_handle_error(struct super_block *sb)
494 {
495         if (sb->s_flags & MS_RDONLY)
496                 return;
497
498         if (!test_opt(sb, ERRORS_CONT)) {
499                 journal_t *journal = EXT4_SB(sb)->s_journal;
500
501                 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
502                 if (journal)
503                         jbd2_journal_abort(journal, -EIO);
504         }
505         if (test_opt(sb, ERRORS_RO)) {
506                 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
507                 sb->s_flags |= MS_RDONLY;
508         }
509         if (test_opt(sb, ERRORS_PANIC))
510                 panic("EXT4-fs (device %s): panic forced after error\n",
511                         sb->s_id);
512 }
513
514 void __ext4_error(struct super_block *sb, const char *function,
515                   unsigned int line, const char *fmt, ...)
516 {
517         struct va_format vaf;
518         va_list args;
519
520         va_start(args, fmt);
521         vaf.fmt = fmt;
522         vaf.va = &args;
523         printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n",
524                sb->s_id, function, line, current->comm, &vaf);
525         va_end(args);
526         save_error_info(sb, function, line);
527
528         ext4_handle_error(sb);
529 }
530
531 void ext4_error_inode(struct inode *inode, const char *function,
532                       unsigned int line, ext4_fsblk_t block,
533                       const char *fmt, ...)
534 {
535         va_list args;
536         struct va_format vaf;
537         struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
538
539         es->s_last_error_ino = cpu_to_le32(inode->i_ino);
540         es->s_last_error_block = cpu_to_le64(block);
541         save_error_info(inode->i_sb, function, line);
542         va_start(args, fmt);
543         vaf.fmt = fmt;
544         vaf.va = &args;
545         if (block)
546                 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
547                        "inode #%lu: block %llu: comm %s: %pV\n",
548                        inode->i_sb->s_id, function, line, inode->i_ino,
549                        block, current->comm, &vaf);
550         else
551                 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
552                        "inode #%lu: comm %s: %pV\n",
553                        inode->i_sb->s_id, function, line, inode->i_ino,
554                        current->comm, &vaf);
555         va_end(args);
556
557         ext4_handle_error(inode->i_sb);
558 }
559
560 void ext4_error_file(struct file *file, const char *function,
561                      unsigned int line, ext4_fsblk_t block,
562                      const char *fmt, ...)
563 {
564         va_list args;
565         struct va_format vaf;
566         struct ext4_super_block *es;
567         struct inode *inode = file->f_dentry->d_inode;
568         char pathname[80], *path;
569
570         es = EXT4_SB(inode->i_sb)->s_es;
571         es->s_last_error_ino = cpu_to_le32(inode->i_ino);
572         save_error_info(inode->i_sb, function, line);
573         path = d_path(&(file->f_path), pathname, sizeof(pathname));
574         if (IS_ERR(path))
575                 path = "(unknown)";
576         va_start(args, fmt);
577         vaf.fmt = fmt;
578         vaf.va = &args;
579         if (block)
580                 printk(KERN_CRIT
581                        "EXT4-fs error (device %s): %s:%d: inode #%lu: "
582                        "block %llu: comm %s: path %s: %pV\n",
583                        inode->i_sb->s_id, function, line, inode->i_ino,
584                        block, current->comm, path, &vaf);
585         else
586                 printk(KERN_CRIT
587                        "EXT4-fs error (device %s): %s:%d: inode #%lu: "
588                        "comm %s: path %s: %pV\n",
589                        inode->i_sb->s_id, function, line, inode->i_ino,
590                        current->comm, path, &vaf);
591         va_end(args);
592
593         ext4_handle_error(inode->i_sb);
594 }
595
596 static const char *ext4_decode_error(struct super_block *sb, int errno,
597                                      char nbuf[16])
598 {
599         char *errstr = NULL;
600
601         switch (errno) {
602         case -EIO:
603                 errstr = "IO failure";
604                 break;
605         case -ENOMEM:
606                 errstr = "Out of memory";
607                 break;
608         case -EROFS:
609                 if (!sb || (EXT4_SB(sb)->s_journal &&
610                             EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT))
611                         errstr = "Journal has aborted";
612                 else
613                         errstr = "Readonly filesystem";
614                 break;
615         default:
616                 /* If the caller passed in an extra buffer for unknown
617                  * errors, textualise them now.  Else we just return
618                  * NULL. */
619                 if (nbuf) {
620                         /* Check for truncated error codes... */
621                         if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
622                                 errstr = nbuf;
623                 }
624                 break;
625         }
626
627         return errstr;
628 }
629
630 /* __ext4_std_error decodes expected errors from journaling functions
631  * automatically and invokes the appropriate error response.  */
632
633 void __ext4_std_error(struct super_block *sb, const char *function,
634                       unsigned int line, int errno)
635 {
636         char nbuf[16];
637         const char *errstr;
638
639         /* Special case: if the error is EROFS, and we're not already
640          * inside a transaction, then there's really no point in logging
641          * an error. */
642         if (errno == -EROFS && journal_current_handle() == NULL &&
643             (sb->s_flags & MS_RDONLY))
644                 return;
645
646         errstr = ext4_decode_error(sb, errno, nbuf);
647         printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n",
648                sb->s_id, function, line, errstr);
649         save_error_info(sb, function, line);
650
651         ext4_handle_error(sb);
652 }
653
654 /*
655  * ext4_abort is a much stronger failure handler than ext4_error.  The
656  * abort function may be used to deal with unrecoverable failures such
657  * as journal IO errors or ENOMEM at a critical moment in log management.
658  *
659  * We unconditionally force the filesystem into an ABORT|READONLY state,
660  * unless the error response on the fs has been set to panic in which
661  * case we take the easy way out and panic immediately.
662  */
663
664 void __ext4_abort(struct super_block *sb, const char *function,
665                 unsigned int line, const char *fmt, ...)
666 {
667         va_list args;
668
669         save_error_info(sb, function, line);
670         va_start(args, fmt);
671         printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: ", sb->s_id,
672                function, line);
673         vprintk(fmt, args);
674         printk("\n");
675         va_end(args);
676
677         if ((sb->s_flags & MS_RDONLY) == 0) {
678                 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
679                 sb->s_flags |= MS_RDONLY;
680                 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
681                 if (EXT4_SB(sb)->s_journal)
682                         jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
683                 save_error_info(sb, function, line);
684         }
685         if (test_opt(sb, ERRORS_PANIC))
686                 panic("EXT4-fs panic from previous error\n");
687 }
688
689 void ext4_msg(struct super_block *sb, const char *prefix, const char *fmt, ...)
690 {
691         struct va_format vaf;
692         va_list args;
693
694         va_start(args, fmt);
695         vaf.fmt = fmt;
696         vaf.va = &args;
697         printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
698         va_end(args);
699 }
700
701 void __ext4_warning(struct super_block *sb, const char *function,
702                     unsigned int line, const char *fmt, ...)
703 {
704         struct va_format vaf;
705         va_list args;
706
707         va_start(args, fmt);
708         vaf.fmt = fmt;
709         vaf.va = &args;
710         printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: %pV\n",
711                sb->s_id, function, line, &vaf);
712         va_end(args);
713 }
714
715 void __ext4_grp_locked_error(const char *function, unsigned int line,
716                              struct super_block *sb, ext4_group_t grp,
717                              unsigned long ino, ext4_fsblk_t block,
718                              const char *fmt, ...)
719 __releases(bitlock)
720 __acquires(bitlock)
721 {
722         struct va_format vaf;
723         va_list args;
724         struct ext4_super_block *es = EXT4_SB(sb)->s_es;
725
726         es->s_last_error_ino = cpu_to_le32(ino);
727         es->s_last_error_block = cpu_to_le64(block);
728         __save_error_info(sb, function, line);
729
730         va_start(args, fmt);
731
732         vaf.fmt = fmt;
733         vaf.va = &args;
734         printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u, ",
735                sb->s_id, function, line, grp);
736         if (ino)
737                 printk(KERN_CONT "inode %lu: ", ino);
738         if (block)
739                 printk(KERN_CONT "block %llu:", (unsigned long long) block);
740         printk(KERN_CONT "%pV\n", &vaf);
741         va_end(args);
742
743         if (test_opt(sb, ERRORS_CONT)) {
744                 ext4_commit_super(sb, 0);
745                 return;
746         }
747
748         ext4_unlock_group(sb, grp);
749         ext4_handle_error(sb);
750         /*
751          * We only get here in the ERRORS_RO case; relocking the group
752          * may be dangerous, but nothing bad will happen since the
753          * filesystem will have already been marked read/only and the
754          * journal has been aborted.  We return 1 as a hint to callers
755          * who might what to use the return value from
756          * ext4_grp_locked_error() to distinguish between the
757          * ERRORS_CONT and ERRORS_RO case, and perhaps return more
758          * aggressively from the ext4 function in question, with a
759          * more appropriate error code.
760          */
761         ext4_lock_group(sb, grp);
762         return;
763 }
764
765 void ext4_update_dynamic_rev(struct super_block *sb)
766 {
767         struct ext4_super_block *es = EXT4_SB(sb)->s_es;
768
769         if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
770                 return;
771
772         ext4_warning(sb,
773                      "updating to rev %d because of new feature flag, "
774                      "running e2fsck is recommended",
775                      EXT4_DYNAMIC_REV);
776
777         es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
778         es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
779         es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
780         /* leave es->s_feature_*compat flags alone */
781         /* es->s_uuid will be set by e2fsck if empty */
782
783         /*
784          * The rest of the superblock fields should be zero, and if not it
785          * means they are likely already in use, so leave them alone.  We
786          * can leave it up to e2fsck to clean up any inconsistencies there.
787          */
788 }
789
790 /*
791  * Open the external journal device
792  */
793 static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb)
794 {
795         struct block_device *bdev;
796         char b[BDEVNAME_SIZE];
797
798         bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
799         if (IS_ERR(bdev))
800                 goto fail;
801         return bdev;
802
803 fail:
804         ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld",
805                         __bdevname(dev, b), PTR_ERR(bdev));
806         return NULL;
807 }
808
809 /*
810  * Release the journal device
811  */
812 static int ext4_blkdev_put(struct block_device *bdev)
813 {
814         return blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
815 }
816
817 static int ext4_blkdev_remove(struct ext4_sb_info *sbi)
818 {
819         struct block_device *bdev;
820         int ret = -ENODEV;
821
822         bdev = sbi->journal_bdev;
823         if (bdev) {
824                 ret = ext4_blkdev_put(bdev);
825                 sbi->journal_bdev = NULL;
826         }
827         return ret;
828 }
829
830 static inline struct inode *orphan_list_entry(struct list_head *l)
831 {
832         return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
833 }
834
835 static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
836 {
837         struct list_head *l;
838
839         ext4_msg(sb, KERN_ERR, "sb orphan head is %d",
840                  le32_to_cpu(sbi->s_es->s_last_orphan));
841
842         printk(KERN_ERR "sb_info orphan list:\n");
843         list_for_each(l, &sbi->s_orphan) {
844                 struct inode *inode = orphan_list_entry(l);
845                 printk(KERN_ERR "  "
846                        "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
847                        inode->i_sb->s_id, inode->i_ino, inode,
848                        inode->i_mode, inode->i_nlink,
849                        NEXT_ORPHAN(inode));
850         }
851 }
852
853 static void ext4_put_super(struct super_block *sb)
854 {
855         struct ext4_sb_info *sbi = EXT4_SB(sb);
856         struct ext4_super_block *es = sbi->s_es;
857         int i, err;
858
859         ext4_unregister_li_request(sb);
860         dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
861
862         flush_workqueue(sbi->dio_unwritten_wq);
863         destroy_workqueue(sbi->dio_unwritten_wq);
864
865         if (sbi->s_journal) {
866                 err = jbd2_journal_destroy(sbi->s_journal);
867                 sbi->s_journal = NULL;
868                 if (err < 0)
869                         ext4_abort(sb, "Couldn't clean up the journal");
870         }
871
872         del_timer(&sbi->s_err_report);
873         ext4_release_system_zone(sb);
874         ext4_mb_release(sb);
875         ext4_ext_release(sb);
876         ext4_xattr_put_super(sb);
877
878         if (!(sb->s_flags & MS_RDONLY)) {
879                 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
880                 es->s_state = cpu_to_le16(sbi->s_mount_state);
881         }
882         if (!(sb->s_flags & MS_RDONLY))
883                 ext4_commit_super(sb, 1);
884
885         if (sbi->s_proc) {
886                 remove_proc_entry("options", sbi->s_proc);
887                 remove_proc_entry(sb->s_id, ext4_proc_root);
888         }
889         kobject_del(&sbi->s_kobj);
890
891         for (i = 0; i < sbi->s_gdb_count; i++)
892                 brelse(sbi->s_group_desc[i]);
893         ext4_kvfree(sbi->s_group_desc);
894         ext4_kvfree(sbi->s_flex_groups);
895         percpu_counter_destroy(&sbi->s_freeclusters_counter);
896         percpu_counter_destroy(&sbi->s_freeinodes_counter);
897         percpu_counter_destroy(&sbi->s_dirs_counter);
898         percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
899         brelse(sbi->s_sbh);
900 #ifdef CONFIG_QUOTA
901         for (i = 0; i < MAXQUOTAS; i++)
902                 kfree(sbi->s_qf_names[i]);
903 #endif
904
905         /* Debugging code just in case the in-memory inode orphan list
906          * isn't empty.  The on-disk one can be non-empty if we've
907          * detected an error and taken the fs readonly, but the
908          * in-memory list had better be clean by this point. */
909         if (!list_empty(&sbi->s_orphan))
910                 dump_orphan_list(sb, sbi);
911         J_ASSERT(list_empty(&sbi->s_orphan));
912
913         invalidate_bdev(sb->s_bdev);
914         if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
915                 /*
916                  * Invalidate the journal device's buffers.  We don't want them
917                  * floating about in memory - the physical journal device may
918                  * hotswapped, and it breaks the `ro-after' testing code.
919                  */
920                 sync_blockdev(sbi->journal_bdev);
921                 invalidate_bdev(sbi->journal_bdev);
922                 ext4_blkdev_remove(sbi);
923         }
924         if (sbi->s_mmp_tsk)
925                 kthread_stop(sbi->s_mmp_tsk);
926         sb->s_fs_info = NULL;
927         /*
928          * Now that we are completely done shutting down the
929          * superblock, we need to actually destroy the kobject.
930          */
931         kobject_put(&sbi->s_kobj);
932         wait_for_completion(&sbi->s_kobj_unregister);
933         if (sbi->s_chksum_driver)
934                 crypto_free_shash(sbi->s_chksum_driver);
935         kfree(sbi->s_blockgroup_lock);
936         kfree(sbi);
937 }
938
939 static struct kmem_cache *ext4_inode_cachep;
940
941 /*
942  * Called inside transaction, so use GFP_NOFS
943  */
944 static struct inode *ext4_alloc_inode(struct super_block *sb)
945 {
946         struct ext4_inode_info *ei;
947
948         ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
949         if (!ei)
950                 return NULL;
951
952         ei->vfs_inode.i_version = 1;
953         ei->vfs_inode.i_data.writeback_index = 0;
954         memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache));
955         INIT_LIST_HEAD(&ei->i_prealloc_list);
956         spin_lock_init(&ei->i_prealloc_lock);
957         ei->i_reserved_data_blocks = 0;
958         ei->i_reserved_meta_blocks = 0;
959         ei->i_allocated_meta_blocks = 0;
960         ei->i_da_metadata_calc_len = 0;
961         ei->i_da_metadata_calc_last_lblock = 0;
962         spin_lock_init(&(ei->i_block_reservation_lock));
963 #ifdef CONFIG_QUOTA
964         ei->i_reserved_quota = 0;
965 #endif
966         ei->jinode = NULL;
967         INIT_LIST_HEAD(&ei->i_completed_io_list);
968         spin_lock_init(&ei->i_completed_io_lock);
969         ei->i_sync_tid = 0;
970         ei->i_datasync_tid = 0;
971         atomic_set(&ei->i_ioend_count, 0);
972         atomic_set(&ei->i_unwritten, 0);
973
974         return &ei->vfs_inode;
975 }
976
977 static int ext4_drop_inode(struct inode *inode)
978 {
979         int drop = generic_drop_inode(inode);
980
981         trace_ext4_drop_inode(inode, drop);
982         return drop;
983 }
984
985 static void ext4_i_callback(struct rcu_head *head)
986 {
987         struct inode *inode = container_of(head, struct inode, i_rcu);
988         kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
989 }
990
991 static void ext4_destroy_inode(struct inode *inode)
992 {
993         if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
994                 ext4_msg(inode->i_sb, KERN_ERR,
995                          "Inode %lu (%p): orphan list check failed!",
996                          inode->i_ino, EXT4_I(inode));
997                 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
998                                 EXT4_I(inode), sizeof(struct ext4_inode_info),
999                                 true);
1000                 dump_stack();
1001         }
1002         call_rcu(&inode->i_rcu, ext4_i_callback);
1003 }
1004
1005 static void init_once(void *foo)
1006 {
1007         struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
1008
1009         INIT_LIST_HEAD(&ei->i_orphan);
1010 #ifdef CONFIG_EXT4_FS_XATTR
1011         init_rwsem(&ei->xattr_sem);
1012 #endif
1013         init_rwsem(&ei->i_data_sem);
1014         inode_init_once(&ei->vfs_inode);
1015 }
1016
1017 static int init_inodecache(void)
1018 {
1019         ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
1020                                              sizeof(struct ext4_inode_info),
1021                                              0, (SLAB_RECLAIM_ACCOUNT|
1022                                                 SLAB_MEM_SPREAD),
1023                                              init_once);
1024         if (ext4_inode_cachep == NULL)
1025                 return -ENOMEM;
1026         return 0;
1027 }
1028
1029 static void destroy_inodecache(void)
1030 {
1031         kmem_cache_destroy(ext4_inode_cachep);
1032 }
1033
1034 void ext4_clear_inode(struct inode *inode)
1035 {
1036         invalidate_inode_buffers(inode);
1037         clear_inode(inode);
1038         dquot_drop(inode);
1039         ext4_discard_preallocations(inode);
1040         if (EXT4_I(inode)->jinode) {
1041                 jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode),
1042                                                EXT4_I(inode)->jinode);
1043                 jbd2_free_inode(EXT4_I(inode)->jinode);
1044                 EXT4_I(inode)->jinode = NULL;
1045         }
1046 }
1047
1048 static struct inode *ext4_nfs_get_inode(struct super_block *sb,
1049                                         u64 ino, u32 generation)
1050 {
1051         struct inode *inode;
1052
1053         if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
1054                 return ERR_PTR(-ESTALE);
1055         if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
1056                 return ERR_PTR(-ESTALE);
1057
1058         /* iget isn't really right if the inode is currently unallocated!!
1059          *
1060          * ext4_read_inode will return a bad_inode if the inode had been
1061          * deleted, so we should be safe.
1062          *
1063          * Currently we don't know the generation for parent directory, so
1064          * a generation of 0 means "accept any"
1065          */
1066         inode = ext4_iget(sb, ino);
1067         if (IS_ERR(inode))
1068                 return ERR_CAST(inode);
1069         if (generation && inode->i_generation != generation) {
1070                 iput(inode);
1071                 return ERR_PTR(-ESTALE);
1072         }
1073
1074         return inode;
1075 }
1076
1077 static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
1078                                         int fh_len, int fh_type)
1079 {
1080         return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
1081                                     ext4_nfs_get_inode);
1082 }
1083
1084 static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
1085                                         int fh_len, int fh_type)
1086 {
1087         return generic_fh_to_parent(sb, fid, fh_len, fh_type,
1088                                     ext4_nfs_get_inode);
1089 }
1090
1091 /*
1092  * Try to release metadata pages (indirect blocks, directories) which are
1093  * mapped via the block device.  Since these pages could have journal heads
1094  * which would prevent try_to_free_buffers() from freeing them, we must use
1095  * jbd2 layer's try_to_free_buffers() function to release them.
1096  */
1097 static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
1098                                  gfp_t wait)
1099 {
1100         journal_t *journal = EXT4_SB(sb)->s_journal;
1101
1102         WARN_ON(PageChecked(page));
1103         if (!page_has_buffers(page))
1104                 return 0;
1105         if (journal)
1106                 return jbd2_journal_try_to_free_buffers(journal, page,
1107                                                         wait & ~__GFP_WAIT);
1108         return try_to_free_buffers(page);
1109 }
1110
1111 #ifdef CONFIG_QUOTA
1112 #define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
1113 #define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
1114
1115 static int ext4_write_dquot(struct dquot *dquot);
1116 static int ext4_acquire_dquot(struct dquot *dquot);
1117 static int ext4_release_dquot(struct dquot *dquot);
1118 static int ext4_mark_dquot_dirty(struct dquot *dquot);
1119 static int ext4_write_info(struct super_block *sb, int type);
1120 static int ext4_quota_on(struct super_block *sb, int type, int format_id,
1121                          struct path *path);
1122 static int ext4_quota_on_sysfile(struct super_block *sb, int type,
1123                                  int format_id);
1124 static int ext4_quota_off(struct super_block *sb, int type);
1125 static int ext4_quota_off_sysfile(struct super_block *sb, int type);
1126 static int ext4_quota_on_mount(struct super_block *sb, int type);
1127 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
1128                                size_t len, loff_t off);
1129 static ssize_t ext4_quota_write(struct super_block *sb, int type,
1130                                 const char *data, size_t len, loff_t off);
1131 static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
1132                              unsigned int flags);
1133 static int ext4_enable_quotas(struct super_block *sb);
1134
1135 static const struct dquot_operations ext4_quota_operations = {
1136         .get_reserved_space = ext4_get_reserved_space,
1137         .write_dquot    = ext4_write_dquot,
1138         .acquire_dquot  = ext4_acquire_dquot,
1139         .release_dquot  = ext4_release_dquot,
1140         .mark_dirty     = ext4_mark_dquot_dirty,
1141         .write_info     = ext4_write_info,
1142         .alloc_dquot    = dquot_alloc,
1143         .destroy_dquot  = dquot_destroy,
1144 };
1145
1146 static const struct quotactl_ops ext4_qctl_operations = {
1147         .quota_on       = ext4_quota_on,
1148         .quota_off      = ext4_quota_off,
1149         .quota_sync     = dquot_quota_sync,
1150         .get_info       = dquot_get_dqinfo,
1151         .set_info       = dquot_set_dqinfo,
1152         .get_dqblk      = dquot_get_dqblk,
1153         .set_dqblk      = dquot_set_dqblk
1154 };
1155
1156 static const struct quotactl_ops ext4_qctl_sysfile_operations = {
1157         .quota_on_meta  = ext4_quota_on_sysfile,
1158         .quota_off      = ext4_quota_off_sysfile,
1159         .quota_sync     = dquot_quota_sync,
1160         .get_info       = dquot_get_dqinfo,
1161         .set_info       = dquot_set_dqinfo,
1162         .get_dqblk      = dquot_get_dqblk,
1163         .set_dqblk      = dquot_set_dqblk
1164 };
1165 #endif
1166
1167 static const struct super_operations ext4_sops = {
1168         .alloc_inode    = ext4_alloc_inode,
1169         .destroy_inode  = ext4_destroy_inode,
1170         .write_inode    = ext4_write_inode,
1171         .dirty_inode    = ext4_dirty_inode,
1172         .drop_inode     = ext4_drop_inode,
1173         .evict_inode    = ext4_evict_inode,
1174         .put_super      = ext4_put_super,
1175         .sync_fs        = ext4_sync_fs,
1176         .freeze_fs      = ext4_freeze,
1177         .unfreeze_fs    = ext4_unfreeze,
1178         .statfs         = ext4_statfs,
1179         .remount_fs     = ext4_remount,
1180         .show_options   = ext4_show_options,
1181 #ifdef CONFIG_QUOTA
1182         .quota_read     = ext4_quota_read,
1183         .quota_write    = ext4_quota_write,
1184 #endif
1185         .bdev_try_to_free_page = bdev_try_to_free_page,
1186 };
1187
1188 static const struct super_operations ext4_nojournal_sops = {
1189         .alloc_inode    = ext4_alloc_inode,
1190         .destroy_inode  = ext4_destroy_inode,
1191         .write_inode    = ext4_write_inode,
1192         .dirty_inode    = ext4_dirty_inode,
1193         .drop_inode     = ext4_drop_inode,
1194         .evict_inode    = ext4_evict_inode,
1195         .put_super      = ext4_put_super,
1196         .statfs         = ext4_statfs,
1197         .remount_fs     = ext4_remount,
1198         .show_options   = ext4_show_options,
1199 #ifdef CONFIG_QUOTA
1200         .quota_read     = ext4_quota_read,
1201         .quota_write    = ext4_quota_write,
1202 #endif
1203         .bdev_try_to_free_page = bdev_try_to_free_page,
1204 };
1205
1206 static const struct export_operations ext4_export_ops = {
1207         .fh_to_dentry = ext4_fh_to_dentry,
1208         .fh_to_parent = ext4_fh_to_parent,
1209         .get_parent = ext4_get_parent,
1210 };
1211
1212 enum {
1213         Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
1214         Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
1215         Opt_nouid32, Opt_debug, Opt_removed,
1216         Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
1217         Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload,
1218         Opt_commit, Opt_min_batch_time, Opt_max_batch_time,
1219         Opt_journal_dev, Opt_journal_checksum, Opt_journal_async_commit,
1220         Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
1221         Opt_data_err_abort, Opt_data_err_ignore,
1222         Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
1223         Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
1224         Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err,
1225         Opt_usrquota, Opt_grpquota, Opt_i_version,
1226         Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_mblk_io_submit,
1227         Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity,
1228         Opt_inode_readahead_blks, Opt_journal_ioprio,
1229         Opt_dioread_nolock, Opt_dioread_lock,
1230         Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable,
1231         Opt_max_dir_size_kb,
1232 };
1233
1234 static const match_table_t tokens = {
1235         {Opt_bsd_df, "bsddf"},
1236         {Opt_minix_df, "minixdf"},
1237         {Opt_grpid, "grpid"},
1238         {Opt_grpid, "bsdgroups"},
1239         {Opt_nogrpid, "nogrpid"},
1240         {Opt_nogrpid, "sysvgroups"},
1241         {Opt_resgid, "resgid=%u"},
1242         {Opt_resuid, "resuid=%u"},
1243         {Opt_sb, "sb=%u"},
1244         {Opt_err_cont, "errors=continue"},
1245         {Opt_err_panic, "errors=panic"},
1246         {Opt_err_ro, "errors=remount-ro"},
1247         {Opt_nouid32, "nouid32"},
1248         {Opt_debug, "debug"},
1249         {Opt_removed, "oldalloc"},
1250         {Opt_removed, "orlov"},
1251         {Opt_user_xattr, "user_xattr"},
1252         {Opt_nouser_xattr, "nouser_xattr"},
1253         {Opt_acl, "acl"},
1254         {Opt_noacl, "noacl"},
1255         {Opt_noload, "norecovery"},
1256         {Opt_noload, "noload"},
1257         {Opt_removed, "nobh"},
1258         {Opt_removed, "bh"},
1259         {Opt_commit, "commit=%u"},
1260         {Opt_min_batch_time, "min_batch_time=%u"},
1261         {Opt_max_batch_time, "max_batch_time=%u"},
1262         {Opt_journal_dev, "journal_dev=%u"},
1263         {Opt_journal_checksum, "journal_checksum"},
1264         {Opt_journal_async_commit, "journal_async_commit"},
1265         {Opt_abort, "abort"},
1266         {Opt_data_journal, "data=journal"},
1267         {Opt_data_ordered, "data=ordered"},
1268         {Opt_data_writeback, "data=writeback"},
1269         {Opt_data_err_abort, "data_err=abort"},
1270         {Opt_data_err_ignore, "data_err=ignore"},
1271         {Opt_offusrjquota, "usrjquota="},
1272         {Opt_usrjquota, "usrjquota=%s"},
1273         {Opt_offgrpjquota, "grpjquota="},
1274         {Opt_grpjquota, "grpjquota=%s"},
1275         {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
1276         {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
1277         {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
1278         {Opt_grpquota, "grpquota"},
1279         {Opt_noquota, "noquota"},
1280         {Opt_quota, "quota"},
1281         {Opt_usrquota, "usrquota"},
1282         {Opt_barrier, "barrier=%u"},
1283         {Opt_barrier, "barrier"},
1284         {Opt_nobarrier, "nobarrier"},
1285         {Opt_i_version, "i_version"},
1286         {Opt_stripe, "stripe=%u"},
1287         {Opt_delalloc, "delalloc"},
1288         {Opt_nodelalloc, "nodelalloc"},
1289         {Opt_mblk_io_submit, "mblk_io_submit"},
1290         {Opt_nomblk_io_submit, "nomblk_io_submit"},
1291         {Opt_block_validity, "block_validity"},
1292         {Opt_noblock_validity, "noblock_validity"},
1293         {Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
1294         {Opt_journal_ioprio, "journal_ioprio=%u"},
1295         {Opt_auto_da_alloc, "auto_da_alloc=%u"},
1296         {Opt_auto_da_alloc, "auto_da_alloc"},
1297         {Opt_noauto_da_alloc, "noauto_da_alloc"},
1298         {Opt_dioread_nolock, "dioread_nolock"},
1299         {Opt_dioread_lock, "dioread_lock"},
1300         {Opt_discard, "discard"},
1301         {Opt_nodiscard, "nodiscard"},
1302         {Opt_init_itable, "init_itable=%u"},
1303         {Opt_init_itable, "init_itable"},
1304         {Opt_noinit_itable, "noinit_itable"},
1305         {Opt_max_dir_size_kb, "max_dir_size_kb=%u"},
1306         {Opt_removed, "check=none"},    /* mount option from ext2/3 */
1307         {Opt_removed, "nocheck"},       /* mount option from ext2/3 */
1308         {Opt_removed, "reservation"},   /* mount option from ext2/3 */
1309         {Opt_removed, "noreservation"}, /* mount option from ext2/3 */
1310         {Opt_removed, "journal=%u"},    /* mount option from ext2/3 */
1311         {Opt_err, NULL},
1312 };
1313
1314 static ext4_fsblk_t get_sb_block(void **data)
1315 {
1316         ext4_fsblk_t    sb_block;
1317         char            *options = (char *) *data;
1318
1319         if (!options || strncmp(options, "sb=", 3) != 0)
1320                 return 1;       /* Default location */
1321
1322         options += 3;
1323         /* TODO: use simple_strtoll with >32bit ext4 */
1324         sb_block = simple_strtoul(options, &options, 0);
1325         if (*options && *options != ',') {
1326                 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
1327                        (char *) *data);
1328                 return 1;
1329         }
1330         if (*options == ',')
1331                 options++;
1332         *data = (void *) options;
1333
1334         return sb_block;
1335 }
1336
1337 #define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
1338 static char deprecated_msg[] = "Mount option \"%s\" will be removed by %s\n"
1339         "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
1340
1341 #ifdef CONFIG_QUOTA
1342 static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
1343 {
1344         struct ext4_sb_info *sbi = EXT4_SB(sb);
1345         char *qname;
1346
1347         if (sb_any_quota_loaded(sb) &&
1348                 !sbi->s_qf_names[qtype]) {
1349                 ext4_msg(sb, KERN_ERR,
1350                         "Cannot change journaled "
1351                         "quota options when quota turned on");
1352                 return -1;
1353         }
1354         qname = match_strdup(args);
1355         if (!qname) {
1356                 ext4_msg(sb, KERN_ERR,
1357                         "Not enough memory for storing quotafile name");
1358                 return -1;
1359         }
1360         if (sbi->s_qf_names[qtype] &&
1361                 strcmp(sbi->s_qf_names[qtype], qname)) {
1362                 ext4_msg(sb, KERN_ERR,
1363                         "%s quota file already specified", QTYPE2NAME(qtype));
1364                 kfree(qname);
1365                 return -1;
1366         }
1367         sbi->s_qf_names[qtype] = qname;
1368         if (strchr(sbi->s_qf_names[qtype], '/')) {
1369                 ext4_msg(sb, KERN_ERR,
1370                         "quotafile must be on filesystem root");
1371                 kfree(sbi->s_qf_names[qtype]);
1372                 sbi->s_qf_names[qtype] = NULL;
1373                 return -1;
1374         }
1375         set_opt(sb, QUOTA);
1376         return 1;
1377 }
1378
1379 static int clear_qf_name(struct super_block *sb, int qtype)
1380 {
1381
1382         struct ext4_sb_info *sbi = EXT4_SB(sb);
1383
1384         if (sb_any_quota_loaded(sb) &&
1385                 sbi->s_qf_names[qtype]) {
1386                 ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options"
1387                         " when quota turned on");
1388                 return -1;
1389         }
1390         /*
1391          * The space will be released later when all options are confirmed
1392          * to be correct
1393          */
1394         sbi->s_qf_names[qtype] = NULL;
1395         return 1;
1396 }
1397 #endif
1398
1399 #define MOPT_SET        0x0001
1400 #define MOPT_CLEAR      0x0002
1401 #define MOPT_NOSUPPORT  0x0004
1402 #define MOPT_EXPLICIT   0x0008
1403 #define MOPT_CLEAR_ERR  0x0010
1404 #define MOPT_GTE0       0x0020
1405 #ifdef CONFIG_QUOTA
1406 #define MOPT_Q          0
1407 #define MOPT_QFMT       0x0040
1408 #else
1409 #define MOPT_Q          MOPT_NOSUPPORT
1410 #define MOPT_QFMT       MOPT_NOSUPPORT
1411 #endif
1412 #define MOPT_DATAJ      0x0080
1413
1414 static const struct mount_opts {
1415         int     token;
1416         int     mount_opt;
1417         int     flags;
1418 } ext4_mount_opts[] = {
1419         {Opt_minix_df, EXT4_MOUNT_MINIX_DF, MOPT_SET},
1420         {Opt_bsd_df, EXT4_MOUNT_MINIX_DF, MOPT_CLEAR},
1421         {Opt_grpid, EXT4_MOUNT_GRPID, MOPT_SET},
1422         {Opt_nogrpid, EXT4_MOUNT_GRPID, MOPT_CLEAR},
1423         {Opt_mblk_io_submit, EXT4_MOUNT_MBLK_IO_SUBMIT, MOPT_SET},
1424         {Opt_nomblk_io_submit, EXT4_MOUNT_MBLK_IO_SUBMIT, MOPT_CLEAR},
1425         {Opt_block_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_SET},
1426         {Opt_noblock_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_CLEAR},
1427         {Opt_dioread_nolock, EXT4_MOUNT_DIOREAD_NOLOCK, MOPT_SET},
1428         {Opt_dioread_lock, EXT4_MOUNT_DIOREAD_NOLOCK, MOPT_CLEAR},
1429         {Opt_discard, EXT4_MOUNT_DISCARD, MOPT_SET},
1430         {Opt_nodiscard, EXT4_MOUNT_DISCARD, MOPT_CLEAR},
1431         {Opt_delalloc, EXT4_MOUNT_DELALLOC, MOPT_SET | MOPT_EXPLICIT},
1432         {Opt_nodelalloc, EXT4_MOUNT_DELALLOC, MOPT_CLEAR | MOPT_EXPLICIT},
1433         {Opt_journal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM, MOPT_SET},
1434         {Opt_journal_async_commit, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT |
1435                                     EXT4_MOUNT_JOURNAL_CHECKSUM), MOPT_SET},
1436         {Opt_noload, EXT4_MOUNT_NOLOAD, MOPT_SET},
1437         {Opt_err_panic, EXT4_MOUNT_ERRORS_PANIC, MOPT_SET | MOPT_CLEAR_ERR},
1438         {Opt_err_ro, EXT4_MOUNT_ERRORS_RO, MOPT_SET | MOPT_CLEAR_ERR},
1439         {Opt_err_cont, EXT4_MOUNT_ERRORS_CONT, MOPT_SET | MOPT_CLEAR_ERR},
1440         {Opt_data_err_abort, EXT4_MOUNT_DATA_ERR_ABORT, MOPT_SET},
1441         {Opt_data_err_ignore, EXT4_MOUNT_DATA_ERR_ABORT, MOPT_CLEAR},
1442         {Opt_barrier, EXT4_MOUNT_BARRIER, MOPT_SET},
1443         {Opt_nobarrier, EXT4_MOUNT_BARRIER, MOPT_CLEAR},
1444         {Opt_noauto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_SET},
1445         {Opt_auto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_CLEAR},
1446         {Opt_noinit_itable, EXT4_MOUNT_INIT_INODE_TABLE, MOPT_CLEAR},
1447         {Opt_commit, 0, MOPT_GTE0},
1448         {Opt_max_batch_time, 0, MOPT_GTE0},
1449         {Opt_min_batch_time, 0, MOPT_GTE0},
1450         {Opt_inode_readahead_blks, 0, MOPT_GTE0},
1451         {Opt_init_itable, 0, MOPT_GTE0},
1452         {Opt_stripe, 0, MOPT_GTE0},
1453         {Opt_data_journal, EXT4_MOUNT_JOURNAL_DATA, MOPT_DATAJ},
1454         {Opt_data_ordered, EXT4_MOUNT_ORDERED_DATA, MOPT_DATAJ},
1455         {Opt_data_writeback, EXT4_MOUNT_WRITEBACK_DATA, MOPT_DATAJ},
1456 #ifdef CONFIG_EXT4_FS_XATTR
1457         {Opt_user_xattr, EXT4_MOUNT_XATTR_USER, MOPT_SET},
1458         {Opt_nouser_xattr, EXT4_MOUNT_XATTR_USER, MOPT_CLEAR},
1459 #else
1460         {Opt_user_xattr, 0, MOPT_NOSUPPORT},
1461         {Opt_nouser_xattr, 0, MOPT_NOSUPPORT},
1462 #endif
1463 #ifdef CONFIG_EXT4_FS_POSIX_ACL
1464         {Opt_acl, EXT4_MOUNT_POSIX_ACL, MOPT_SET},
1465         {Opt_noacl, EXT4_MOUNT_POSIX_ACL, MOPT_CLEAR},
1466 #else
1467         {Opt_acl, 0, MOPT_NOSUPPORT},
1468         {Opt_noacl, 0, MOPT_NOSUPPORT},
1469 #endif
1470         {Opt_nouid32, EXT4_MOUNT_NO_UID32, MOPT_SET},
1471         {Opt_debug, EXT4_MOUNT_DEBUG, MOPT_SET},
1472         {Opt_quota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA, MOPT_SET | MOPT_Q},
1473         {Opt_usrquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA,
1474                                                         MOPT_SET | MOPT_Q},
1475         {Opt_grpquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_GRPQUOTA,
1476                                                         MOPT_SET | MOPT_Q},
1477         {Opt_noquota, (EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA |
1478                        EXT4_MOUNT_GRPQUOTA), MOPT_CLEAR | MOPT_Q},
1479         {Opt_usrjquota, 0, MOPT_Q},
1480         {Opt_grpjquota, 0, MOPT_Q},
1481         {Opt_offusrjquota, 0, MOPT_Q},
1482         {Opt_offgrpjquota, 0, MOPT_Q},
1483         {Opt_jqfmt_vfsold, QFMT_VFS_OLD, MOPT_QFMT},
1484         {Opt_jqfmt_vfsv0, QFMT_VFS_V0, MOPT_QFMT},
1485         {Opt_jqfmt_vfsv1, QFMT_VFS_V1, MOPT_QFMT},
1486         {Opt_max_dir_size_kb, 0, MOPT_GTE0},
1487         {Opt_err, 0, 0}
1488 };
1489
1490 static int handle_mount_opt(struct super_block *sb, char *opt, int token,
1491                             substring_t *args, unsigned long *journal_devnum,
1492                             unsigned int *journal_ioprio, int is_remount)
1493 {
1494         struct ext4_sb_info *sbi = EXT4_SB(sb);
1495         const struct mount_opts *m;
1496         kuid_t uid;
1497         kgid_t gid;
1498         int arg = 0;
1499
1500 #ifdef CONFIG_QUOTA
1501         if (token == Opt_usrjquota)
1502                 return set_qf_name(sb, USRQUOTA, &args[0]);
1503         else if (token == Opt_grpjquota)
1504                 return set_qf_name(sb, GRPQUOTA, &args[0]);
1505         else if (token == Opt_offusrjquota)
1506                 return clear_qf_name(sb, USRQUOTA);
1507         else if (token == Opt_offgrpjquota)
1508                 return clear_qf_name(sb, GRPQUOTA);
1509 #endif
1510         if (args->from && match_int(args, &arg))
1511                 return -1;
1512         switch (token) {
1513         case Opt_noacl:
1514         case Opt_nouser_xattr:
1515                 ext4_msg(sb, KERN_WARNING, deprecated_msg, opt, "3.5");
1516                 break;
1517         case Opt_sb:
1518                 return 1;       /* handled by get_sb_block() */
1519         case Opt_removed:
1520                 ext4_msg(sb, KERN_WARNING,
1521                          "Ignoring removed %s option", opt);
1522                 return 1;
1523         case Opt_resuid:
1524                 uid = make_kuid(current_user_ns(), arg);
1525                 if (!uid_valid(uid)) {
1526                         ext4_msg(sb, KERN_ERR, "Invalid uid value %d", arg);
1527                         return -1;
1528                 }
1529                 sbi->s_resuid = uid;
1530                 return 1;
1531         case Opt_resgid:
1532                 gid = make_kgid(current_user_ns(), arg);
1533                 if (!gid_valid(gid)) {
1534                         ext4_msg(sb, KERN_ERR, "Invalid gid value %d", arg);
1535                         return -1;
1536                 }
1537                 sbi->s_resgid = gid;
1538                 return 1;
1539         case Opt_abort:
1540                 sbi->s_mount_flags |= EXT4_MF_FS_ABORTED;
1541                 return 1;
1542         case Opt_i_version:
1543                 sb->s_flags |= MS_I_VERSION;
1544                 return 1;
1545         case Opt_journal_dev:
1546                 if (is_remount) {
1547                         ext4_msg(sb, KERN_ERR,
1548                                  "Cannot specify journal on remount");
1549                         return -1;
1550                 }
1551                 *journal_devnum = arg;
1552                 return 1;
1553         case Opt_journal_ioprio:
1554                 if (arg < 0 || arg > 7)
1555                         return -1;
1556                 *journal_ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, arg);
1557                 return 1;
1558         }
1559
1560         for (m = ext4_mount_opts; m->token != Opt_err; m++) {
1561                 if (token != m->token)
1562                         continue;
1563                 if (args->from && (m->flags & MOPT_GTE0) && (arg < 0))
1564                         return -1;
1565                 if (m->flags & MOPT_EXPLICIT)
1566                         set_opt2(sb, EXPLICIT_DELALLOC);
1567                 if (m->flags & MOPT_CLEAR_ERR)
1568                         clear_opt(sb, ERRORS_MASK);
1569                 if (token == Opt_noquota && sb_any_quota_loaded(sb)) {
1570                         ext4_msg(sb, KERN_ERR, "Cannot change quota "
1571                                  "options when quota turned on");
1572                         return -1;
1573                 }
1574
1575                 if (m->flags & MOPT_NOSUPPORT) {
1576                         ext4_msg(sb, KERN_ERR, "%s option not supported", opt);
1577                 } else if (token == Opt_commit) {
1578                         if (arg == 0)
1579                                 arg = JBD2_DEFAULT_MAX_COMMIT_AGE;
1580                         sbi->s_commit_interval = HZ * arg;
1581                 } else if (token == Opt_max_batch_time) {
1582                         if (arg == 0)
1583                                 arg = EXT4_DEF_MAX_BATCH_TIME;
1584                         sbi->s_max_batch_time = arg;
1585                 } else if (token == Opt_min_batch_time) {
1586                         sbi->s_min_batch_time = arg;
1587                 } else if (token == Opt_inode_readahead_blks) {
1588                         if (arg > (1 << 30))
1589                                 return -1;
1590                         if (arg && !is_power_of_2(arg)) {
1591                                 ext4_msg(sb, KERN_ERR,
1592                                          "EXT4-fs: inode_readahead_blks"
1593                                          " must be a power of 2");
1594                                 return -1;
1595                         }
1596                         sbi->s_inode_readahead_blks = arg;
1597                 } else if (token == Opt_init_itable) {
1598                         set_opt(sb, INIT_INODE_TABLE);
1599                         if (!args->from)
1600                                 arg = EXT4_DEF_LI_WAIT_MULT;
1601                         sbi->s_li_wait_mult = arg;
1602                 } else if (token == Opt_max_dir_size_kb) {
1603                         sbi->s_max_dir_size_kb = arg;
1604                 } else if (token == Opt_stripe) {
1605                         sbi->s_stripe = arg;
1606                 } else if (m->flags & MOPT_DATAJ) {
1607                         if (is_remount) {
1608                                 if (!sbi->s_journal)
1609                                         ext4_msg(sb, KERN_WARNING, "Remounting file system with no journal so ignoring journalled data option");
1610                                 else if (test_opt(sb, DATA_FLAGS) !=
1611                                          m->mount_opt) {
1612                                         ext4_msg(sb, KERN_ERR,
1613                                          "Cannot change data mode on remount");
1614                                         return -1;
1615                                 }
1616                         } else {
1617                                 clear_opt(sb, DATA_FLAGS);
1618                                 sbi->s_mount_opt |= m->mount_opt;
1619                         }
1620 #ifdef CONFIG_QUOTA
1621                 } else if (m->flags & MOPT_QFMT) {
1622                         if (sb_any_quota_loaded(sb) &&
1623                             sbi->s_jquota_fmt != m->mount_opt) {
1624                                 ext4_msg(sb, KERN_ERR, "Cannot "
1625                                          "change journaled quota options "
1626                                          "when quota turned on");
1627                                 return -1;
1628                         }
1629                         sbi->s_jquota_fmt = m->mount_opt;
1630 #endif
1631                 } else {
1632                         if (!args->from)
1633                                 arg = 1;
1634                         if (m->flags & MOPT_CLEAR)
1635                                 arg = !arg;
1636                         else if (unlikely(!(m->flags & MOPT_SET))) {
1637                                 ext4_msg(sb, KERN_WARNING,
1638                                          "buggy handling of option %s", opt);
1639                                 WARN_ON(1);
1640                                 return -1;
1641                         }
1642                         if (arg != 0)
1643                                 sbi->s_mount_opt |= m->mount_opt;
1644                         else
1645                                 sbi->s_mount_opt &= ~m->mount_opt;
1646                 }
1647                 return 1;
1648         }
1649         ext4_msg(sb, KERN_ERR, "Unrecognized mount option \"%s\" "
1650                  "or missing value", opt);
1651         return -1;
1652 }
1653
1654 static int parse_options(char *options, struct super_block *sb,
1655                          unsigned long *journal_devnum,
1656                          unsigned int *journal_ioprio,
1657                          int is_remount)
1658 {
1659 #ifdef CONFIG_QUOTA
1660         struct ext4_sb_info *sbi = EXT4_SB(sb);
1661 #endif
1662         char *p;
1663         substring_t args[MAX_OPT_ARGS];
1664         int token;
1665
1666         if (!options)
1667                 return 1;
1668
1669         while ((p = strsep(&options, ",")) != NULL) {
1670                 if (!*p)
1671                         continue;
1672                 /*
1673                  * Initialize args struct so we know whether arg was
1674                  * found; some options take optional arguments.
1675                  */
1676                 args[0].to = args[0].from = NULL;
1677                 token = match_token(p, tokens, args);
1678                 if (handle_mount_opt(sb, p, token, args, journal_devnum,
1679                                      journal_ioprio, is_remount) < 0)
1680                         return 0;
1681         }
1682 #ifdef CONFIG_QUOTA
1683         if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1684                 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
1685                         clear_opt(sb, USRQUOTA);
1686
1687                 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
1688                         clear_opt(sb, GRPQUOTA);
1689
1690                 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
1691                         ext4_msg(sb, KERN_ERR, "old and new quota "
1692                                         "format mixing");
1693                         return 0;
1694                 }
1695
1696                 if (!sbi->s_jquota_fmt) {
1697                         ext4_msg(sb, KERN_ERR, "journaled quota format "
1698                                         "not specified");
1699                         return 0;
1700                 }
1701         } else {
1702                 if (sbi->s_jquota_fmt) {
1703                         ext4_msg(sb, KERN_ERR, "journaled quota format "
1704                                         "specified with no journaling "
1705                                         "enabled");
1706                         return 0;
1707                 }
1708         }
1709 #endif
1710         return 1;
1711 }
1712
1713 static inline void ext4_show_quota_options(struct seq_file *seq,
1714                                            struct super_block *sb)
1715 {
1716 #if defined(CONFIG_QUOTA)
1717         struct ext4_sb_info *sbi = EXT4_SB(sb);
1718
1719         if (sbi->s_jquota_fmt) {
1720                 char *fmtname = "";
1721
1722                 switch (sbi->s_jquota_fmt) {
1723                 case QFMT_VFS_OLD:
1724                         fmtname = "vfsold";
1725                         break;
1726                 case QFMT_VFS_V0:
1727                         fmtname = "vfsv0";
1728                         break;
1729                 case QFMT_VFS_V1:
1730                         fmtname = "vfsv1";
1731                         break;
1732                 }
1733                 seq_printf(seq, ",jqfmt=%s", fmtname);
1734         }
1735
1736         if (sbi->s_qf_names[USRQUOTA])
1737                 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
1738
1739         if (sbi->s_qf_names[GRPQUOTA])
1740                 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
1741
1742         if (test_opt(sb, USRQUOTA))
1743                 seq_puts(seq, ",usrquota");
1744
1745         if (test_opt(sb, GRPQUOTA))
1746                 seq_puts(seq, ",grpquota");
1747 #endif
1748 }
1749
1750 static const char *token2str(int token)
1751 {
1752         const struct match_token *t;
1753
1754         for (t = tokens; t->token != Opt_err; t++)
1755                 if (t->token == token && !strchr(t->pattern, '='))
1756                         break;
1757         return t->pattern;
1758 }
1759
1760 /*
1761  * Show an option if
1762  *  - it's set to a non-default value OR
1763  *  - if the per-sb default is different from the global default
1764  */
1765 static int _ext4_show_options(struct seq_file *seq, struct super_block *sb,
1766                               int nodefs)
1767 {
1768         struct ext4_sb_info *sbi = EXT4_SB(sb);
1769         struct ext4_super_block *es = sbi->s_es;
1770         int def_errors, def_mount_opt = nodefs ? 0 : sbi->s_def_mount_opt;
1771         const struct mount_opts *m;
1772         char sep = nodefs ? '\n' : ',';
1773
1774 #define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep)
1775 #define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg)
1776
1777         if (sbi->s_sb_block != 1)
1778                 SEQ_OPTS_PRINT("sb=%llu", sbi->s_sb_block);
1779
1780         for (m = ext4_mount_opts; m->token != Opt_err; m++) {
1781                 int want_set = m->flags & MOPT_SET;
1782                 if (((m->flags & (MOPT_SET|MOPT_CLEAR)) == 0) ||
1783                     (m->flags & MOPT_CLEAR_ERR))
1784                         continue;
1785                 if (!(m->mount_opt & (sbi->s_mount_opt ^ def_mount_opt)))
1786                         continue; /* skip if same as the default */
1787                 if ((want_set &&
1788                      (sbi->s_mount_opt & m->mount_opt) != m->mount_opt) ||
1789                     (!want_set && (sbi->s_mount_opt & m->mount_opt)))
1790                         continue; /* select Opt_noFoo vs Opt_Foo */
1791                 SEQ_OPTS_PRINT("%s", token2str(m->token));
1792         }
1793
1794         if (nodefs || !uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT4_DEF_RESUID)) ||
1795             le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID)
1796                 SEQ_OPTS_PRINT("resuid=%u",
1797                                 from_kuid_munged(&init_user_ns, sbi->s_resuid));
1798         if (nodefs || !gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT4_DEF_RESGID)) ||
1799             le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID)
1800                 SEQ_OPTS_PRINT("resgid=%u",
1801                                 from_kgid_munged(&init_user_ns, sbi->s_resgid));
1802         def_errors = nodefs ? -1 : le16_to_cpu(es->s_errors);
1803         if (test_opt(sb, ERRORS_RO) && def_errors != EXT4_ERRORS_RO)
1804                 SEQ_OPTS_PUTS("errors=remount-ro");
1805         if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
1806                 SEQ_OPTS_PUTS("errors=continue");
1807         if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
1808                 SEQ_OPTS_PUTS("errors=panic");
1809         if (nodefs || sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ)
1810                 SEQ_OPTS_PRINT("commit=%lu", sbi->s_commit_interval / HZ);
1811         if (nodefs || sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME)
1812                 SEQ_OPTS_PRINT("min_batch_time=%u", sbi->s_min_batch_time);
1813         if (nodefs || sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME)
1814                 SEQ_OPTS_PRINT("max_batch_time=%u", sbi->s_max_batch_time);
1815         if (sb->s_flags & MS_I_VERSION)
1816                 SEQ_OPTS_PUTS("i_version");
1817         if (nodefs || sbi->s_stripe)
1818                 SEQ_OPTS_PRINT("stripe=%lu", sbi->s_stripe);
1819         if (EXT4_MOUNT_DATA_FLAGS & (sbi->s_mount_opt ^ def_mount_opt)) {
1820                 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
1821                         SEQ_OPTS_PUTS("data=journal");
1822                 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
1823                         SEQ_OPTS_PUTS("data=ordered");
1824                 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
1825                         SEQ_OPTS_PUTS("data=writeback");
1826         }
1827         if (nodefs ||
1828             sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
1829                 SEQ_OPTS_PRINT("inode_readahead_blks=%u",
1830                                sbi->s_inode_readahead_blks);
1831
1832         if (nodefs || (test_opt(sb, INIT_INODE_TABLE) &&
1833                        (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT)))
1834                 SEQ_OPTS_PRINT("init_itable=%u", sbi->s_li_wait_mult);
1835         if (nodefs || sbi->s_max_dir_size_kb)
1836                 SEQ_OPTS_PRINT("max_dir_size_kb=%u", sbi->s_max_dir_size_kb);
1837
1838         ext4_show_quota_options(seq, sb);
1839         return 0;
1840 }
1841
1842 static int ext4_show_options(struct seq_file *seq, struct dentry *root)
1843 {
1844         return _ext4_show_options(seq, root->d_sb, 0);
1845 }
1846
1847 static int options_seq_show(struct seq_file *seq, void *offset)
1848 {
1849         struct super_block *sb = seq->private;
1850         int rc;
1851
1852         seq_puts(seq, (sb->s_flags & MS_RDONLY) ? "ro" : "rw");
1853         rc = _ext4_show_options(seq, sb, 1);
1854         seq_puts(seq, "\n");
1855         return rc;
1856 }
1857
1858 static int options_open_fs(struct inode *inode, struct file *file)
1859 {
1860         return single_open(file, options_seq_show, PDE(inode)->data);
1861 }
1862
1863 static const struct file_operations ext4_seq_options_fops = {
1864         .owner = THIS_MODULE,
1865         .open = options_open_fs,
1866         .read = seq_read,
1867         .llseek = seq_lseek,
1868         .release = single_release,
1869 };
1870
1871 static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
1872                             int read_only)
1873 {
1874         struct ext4_sb_info *sbi = EXT4_SB(sb);
1875         int res = 0;
1876
1877         if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
1878                 ext4_msg(sb, KERN_ERR, "revision level too high, "
1879                          "forcing read-only mode");
1880                 res = MS_RDONLY;
1881         }
1882         if (read_only)
1883                 goto done;
1884         if (!(sbi->s_mount_state & EXT4_VALID_FS))
1885                 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
1886                          "running e2fsck is recommended");
1887         else if ((sbi->s_mount_state & EXT4_ERROR_FS))
1888                 ext4_msg(sb, KERN_WARNING,
1889                          "warning: mounting fs with errors, "
1890                          "running e2fsck is recommended");
1891         else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
1892                  le16_to_cpu(es->s_mnt_count) >=
1893                  (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
1894                 ext4_msg(sb, KERN_WARNING,
1895                          "warning: maximal mount count reached, "
1896                          "running e2fsck is recommended");
1897         else if (le32_to_cpu(es->s_checkinterval) &&
1898                 (le32_to_cpu(es->s_lastcheck) +
1899                         le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1900                 ext4_msg(sb, KERN_WARNING,
1901                          "warning: checktime reached, "
1902                          "running e2fsck is recommended");
1903         if (!sbi->s_journal)
1904                 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
1905         if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
1906                 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
1907         le16_add_cpu(&es->s_mnt_count, 1);
1908         es->s_mtime = cpu_to_le32(get_seconds());
1909         ext4_update_dynamic_rev(sb);
1910         if (sbi->s_journal)
1911                 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
1912
1913         ext4_commit_super(sb, 1);
1914 done:
1915         if (test_opt(sb, DEBUG))
1916                 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
1917                                 "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
1918                         sb->s_blocksize,
1919                         sbi->s_groups_count,
1920                         EXT4_BLOCKS_PER_GROUP(sb),
1921                         EXT4_INODES_PER_GROUP(sb),
1922                         sbi->s_mount_opt, sbi->s_mount_opt2);
1923
1924         cleancache_init_fs(sb);
1925         return res;
1926 }
1927
1928 int ext4_alloc_flex_bg_array(struct super_block *sb, ext4_group_t ngroup)
1929 {
1930         struct ext4_sb_info *sbi = EXT4_SB(sb);
1931         struct flex_groups *new_groups;
1932         int size;
1933
1934         if (!sbi->s_log_groups_per_flex)
1935                 return 0;
1936
1937         size = ext4_flex_group(sbi, ngroup - 1) + 1;
1938         if (size <= sbi->s_flex_groups_allocated)
1939                 return 0;
1940
1941         size = roundup_pow_of_two(size * sizeof(struct flex_groups));
1942         new_groups = ext4_kvzalloc(size, GFP_KERNEL);
1943         if (!new_groups) {
1944                 ext4_msg(sb, KERN_ERR, "not enough memory for %d flex groups",
1945                          size / (int) sizeof(struct flex_groups));
1946                 return -ENOMEM;
1947         }
1948
1949         if (sbi->s_flex_groups) {
1950                 memcpy(new_groups, sbi->s_flex_groups,
1951                        (sbi->s_flex_groups_allocated *
1952                         sizeof(struct flex_groups)));
1953                 ext4_kvfree(sbi->s_flex_groups);
1954         }
1955         sbi->s_flex_groups = new_groups;
1956         sbi->s_flex_groups_allocated = size / sizeof(struct flex_groups);
1957         return 0;
1958 }
1959
1960 static int ext4_fill_flex_info(struct super_block *sb)
1961 {
1962         struct ext4_sb_info *sbi = EXT4_SB(sb);
1963         struct ext4_group_desc *gdp = NULL;
1964         ext4_group_t flex_group;
1965         unsigned int groups_per_flex = 0;
1966         int i, err;
1967
1968         sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
1969         if (sbi->s_log_groups_per_flex < 1 || sbi->s_log_groups_per_flex > 31) {
1970                 sbi->s_log_groups_per_flex = 0;
1971                 return 1;
1972         }
1973         groups_per_flex = 1U << sbi->s_log_groups_per_flex;
1974
1975         err = ext4_alloc_flex_bg_array(sb, sbi->s_groups_count);
1976         if (err)
1977                 goto failed;
1978
1979         for (i = 0; i < sbi->s_groups_count; i++) {
1980                 gdp = ext4_get_group_desc(sb, i, NULL);
1981
1982                 flex_group = ext4_flex_group(sbi, i);
1983                 atomic_add(ext4_free_inodes_count(sb, gdp),
1984                            &sbi->s_flex_groups[flex_group].free_inodes);
1985                 atomic_add(ext4_free_group_clusters(sb, gdp),
1986                            &sbi->s_flex_groups[flex_group].free_clusters);
1987                 atomic_add(ext4_used_dirs_count(sb, gdp),
1988                            &sbi->s_flex_groups[flex_group].used_dirs);
1989         }
1990
1991         return 1;
1992 failed:
1993         return 0;
1994 }
1995
1996 static __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
1997                                    struct ext4_group_desc *gdp)
1998 {
1999         int offset;
2000         __u16 crc = 0;
2001         __le32 le_group = cpu_to_le32(block_group);
2002
2003         if ((sbi->s_es->s_feature_ro_compat &
2004              cpu_to_le32(EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))) {
2005                 /* Use new metadata_csum algorithm */
2006                 __u16 old_csum;
2007                 __u32 csum32;
2008
2009                 old_csum = gdp->bg_checksum;
2010                 gdp->bg_checksum = 0;
2011                 csum32 = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&le_group,
2012                                      sizeof(le_group));
2013                 csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp,
2014                                      sbi->s_desc_size);
2015                 gdp->bg_checksum = old_csum;
2016
2017                 crc = csum32 & 0xFFFF;
2018                 goto out;
2019         }
2020
2021         /* old crc16 code */
2022         offset = offsetof(struct ext4_group_desc, bg_checksum);
2023
2024         crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
2025         crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
2026         crc = crc16(crc, (__u8 *)gdp, offset);
2027         offset += sizeof(gdp->bg_checksum); /* skip checksum */
2028         /* for checksum of struct ext4_group_desc do the rest...*/
2029         if ((sbi->s_es->s_feature_incompat &
2030              cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) &&
2031             offset < le16_to_cpu(sbi->s_es->s_desc_size))
2032                 crc = crc16(crc, (__u8 *)gdp + offset,
2033                             le16_to_cpu(sbi->s_es->s_desc_size) -
2034                                 offset);
2035
2036 out:
2037         return cpu_to_le16(crc);
2038 }
2039
2040 int ext4_group_desc_csum_verify(struct super_block *sb, __u32 block_group,
2041                                 struct ext4_group_desc *gdp)
2042 {
2043         if (ext4_has_group_desc_csum(sb) &&
2044             (gdp->bg_checksum != ext4_group_desc_csum(EXT4_SB(sb),
2045                                                       block_group, gdp)))
2046                 return 0;
2047
2048         return 1;
2049 }
2050
2051 void ext4_group_desc_csum_set(struct super_block *sb, __u32 block_group,
2052                               struct ext4_group_desc *gdp)
2053 {
2054         if (!ext4_has_group_desc_csum(sb))
2055                 return;
2056         gdp->bg_checksum = ext4_group_desc_csum(EXT4_SB(sb), block_group, gdp);
2057 }
2058
2059 /* Called at mount-time, super-block is locked */
2060 static int ext4_check_descriptors(struct super_block *sb,
2061                                   ext4_group_t *first_not_zeroed)
2062 {
2063         struct ext4_sb_info *sbi = EXT4_SB(sb);
2064         ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
2065         ext4_fsblk_t last_block;
2066         ext4_fsblk_t block_bitmap;
2067         ext4_fsblk_t inode_bitmap;
2068         ext4_fsblk_t inode_table;
2069         int flexbg_flag = 0;
2070         ext4_group_t i, grp = sbi->s_groups_count;
2071
2072         if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
2073                 flexbg_flag = 1;
2074
2075         ext4_debug("Checking group descriptors");
2076
2077         for (i = 0; i < sbi->s_groups_count; i++) {
2078                 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
2079
2080                 if (i == sbi->s_groups_count - 1 || flexbg_flag)
2081                         last_block = ext4_blocks_count(sbi->s_es) - 1;
2082                 else
2083                         last_block = first_block +
2084                                 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
2085
2086                 if ((grp == sbi->s_groups_count) &&
2087                    !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2088                         grp = i;
2089
2090                 block_bitmap = ext4_block_bitmap(sb, gdp);
2091                 if (block_bitmap < first_block || block_bitmap > last_block) {
2092                         ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2093                                "Block bitmap for group %u not in group "
2094                                "(block %llu)!", i, block_bitmap);
2095                         return 0;
2096                 }
2097                 inode_bitmap = ext4_inode_bitmap(sb, gdp);
2098                 if (inode_bitmap < first_block || inode_bitmap > last_block) {
2099                         ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2100                                "Inode bitmap for group %u not in group "
2101                                "(block %llu)!", i, inode_bitmap);
2102                         return 0;
2103                 }
2104                 inode_table = ext4_inode_table(sb, gdp);
2105                 if (inode_table < first_block ||
2106                     inode_table + sbi->s_itb_per_group - 1 > last_block) {
2107                         ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2108                                "Inode table for group %u not in group "
2109                                "(block %llu)!", i, inode_table);
2110                         return 0;
2111                 }
2112                 ext4_lock_group(sb, i);
2113                 if (!ext4_group_desc_csum_verify(sb, i, gdp)) {
2114                         ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2115                                  "Checksum for group %u failed (%u!=%u)",
2116                                  i, le16_to_cpu(ext4_group_desc_csum(sbi, i,
2117                                      gdp)), le16_to_cpu(gdp->bg_checksum));
2118                         if (!(sb->s_flags & MS_RDONLY)) {
2119                                 ext4_unlock_group(sb, i);
2120                                 return 0;
2121                         }
2122                 }
2123                 ext4_unlock_group(sb, i);
2124                 if (!flexbg_flag)
2125                         first_block += EXT4_BLOCKS_PER_GROUP(sb);
2126         }
2127         if (NULL != first_not_zeroed)
2128                 *first_not_zeroed = grp;
2129
2130         ext4_free_blocks_count_set(sbi->s_es,
2131                                    EXT4_C2B(sbi, ext4_count_free_clusters(sb)));
2132         sbi->s_es->s_free_inodes_count =cpu_to_le32(ext4_count_free_inodes(sb));
2133         return 1;
2134 }
2135
2136 /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
2137  * the superblock) which were deleted from all directories, but held open by
2138  * a process at the time of a crash.  We walk the list and try to delete these
2139  * inodes at recovery time (only with a read-write filesystem).
2140  *
2141  * In order to keep the orphan inode chain consistent during traversal (in
2142  * case of crash during recovery), we link each inode into the superblock
2143  * orphan list_head and handle it the same way as an inode deletion during
2144  * normal operation (which journals the operations for us).
2145  *
2146  * We only do an iget() and an iput() on each inode, which is very safe if we
2147  * accidentally point at an in-use or already deleted inode.  The worst that
2148  * can happen in this case is that we get a "bit already cleared" message from
2149  * ext4_free_inode().  The only reason we would point at a wrong inode is if
2150  * e2fsck was run on this filesystem, and it must have already done the orphan
2151  * inode cleanup for us, so we can safely abort without any further action.
2152  */
2153 static void ext4_orphan_cleanup(struct super_block *sb,
2154                                 struct ext4_super_block *es)
2155 {
2156         unsigned int s_flags = sb->s_flags;
2157         int nr_orphans = 0, nr_truncates = 0;
2158 #ifdef CONFIG_QUOTA
2159         int i;
2160 #endif
2161         if (!es->s_last_orphan) {
2162                 jbd_debug(4, "no orphan inodes to clean up\n");
2163                 return;
2164         }
2165
2166         if (bdev_read_only(sb->s_bdev)) {
2167                 ext4_msg(sb, KERN_ERR, "write access "
2168                         "unavailable, skipping orphan cleanup");
2169                 return;
2170         }
2171
2172         /* Check if feature set would not allow a r/w mount */
2173         if (!ext4_feature_set_ok(sb, 0)) {
2174                 ext4_msg(sb, KERN_INFO, "Skipping orphan cleanup due to "
2175                          "unknown ROCOMPAT features");
2176                 return;
2177         }
2178
2179         if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
2180                 /* don't clear list on RO mount w/ errors */
2181                 if (es->s_last_orphan && !(s_flags & MS_RDONLY)) {
2182                         jbd_debug(1, "Errors on filesystem, "
2183                                   "clearing orphan list.\n");
2184                         es->s_last_orphan = 0;
2185                 }
2186                 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2187                 return;
2188         }
2189
2190         if (s_flags & MS_RDONLY) {
2191                 ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
2192                 sb->s_flags &= ~MS_RDONLY;
2193         }
2194 #ifdef CONFIG_QUOTA
2195         /* Needed for iput() to work correctly and not trash data */
2196         sb->s_flags |= MS_ACTIVE;
2197         /* Turn on quotas so that they are updated correctly */
2198         for (i = 0; i < MAXQUOTAS; i++) {
2199                 if (EXT4_SB(sb)->s_qf_names[i]) {
2200                         int ret = ext4_quota_on_mount(sb, i);
2201                         if (ret < 0)
2202                                 ext4_msg(sb, KERN_ERR,
2203                                         "Cannot turn on journaled "
2204                                         "quota: error %d", ret);
2205                 }
2206         }
2207 #endif
2208
2209         while (es->s_last_orphan) {
2210                 struct inode *inode;
2211
2212                 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
2213                 if (IS_ERR(inode)) {
2214                         es->s_last_orphan = 0;
2215                         break;
2216                 }
2217
2218                 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
2219                 dquot_initialize(inode);
2220                 if (inode->i_nlink) {
2221                         ext4_msg(sb, KERN_DEBUG,
2222                                 "%s: truncating inode %lu to %lld bytes",
2223                                 __func__, inode->i_ino, inode->i_size);
2224                         jbd_debug(2, "truncating inode %lu to %lld bytes\n",
2225                                   inode->i_ino, inode->i_size);
2226                         ext4_truncate(inode);
2227                         nr_truncates++;
2228                 } else {
2229                         ext4_msg(sb, KERN_DEBUG,
2230                                 "%s: deleting unreferenced inode %lu",
2231                                 __func__, inode->i_ino);
2232                         jbd_debug(2, "deleting unreferenced inode %lu\n",
2233                                   inode->i_ino);
2234                         nr_orphans++;
2235                 }
2236                 iput(inode);  /* The delete magic happens here! */
2237         }
2238
2239 #define PLURAL(x) (x), ((x) == 1) ? "" : "s"
2240
2241         if (nr_orphans)
2242                 ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
2243                        PLURAL(nr_orphans));
2244         if (nr_truncates)
2245                 ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
2246                        PLURAL(nr_truncates));
2247 #ifdef CONFIG_QUOTA
2248         /* Turn quotas off */
2249         for (i = 0; i < MAXQUOTAS; i++) {
2250                 if (sb_dqopt(sb)->files[i])
2251                         dquot_quota_off(sb, i);
2252         }
2253 #endif
2254         sb->s_flags = s_flags; /* Restore MS_RDONLY status */
2255 }
2256
2257 /*
2258  * Maximal extent format file size.
2259  * Resulting logical blkno at s_maxbytes must fit in our on-disk
2260  * extent format containers, within a sector_t, and within i_blocks
2261  * in the vfs.  ext4 inode has 48 bits of i_block in fsblock units,
2262  * so that won't be a limiting factor.
2263  *
2264  * However there is other limiting factor. We do store extents in the form
2265  * of starting block and length, hence the resulting length of the extent
2266  * covering maximum file size must fit into on-disk format containers as
2267  * well. Given that length is always by 1 unit bigger than max unit (because
2268  * we count 0 as well) we have to lower the s_maxbytes by one fs block.
2269  *
2270  * Note, this does *not* consider any metadata overhead for vfs i_blocks.
2271  */
2272 static loff_t ext4_max_size(int blkbits, int has_huge_files)
2273 {
2274         loff_t res;
2275         loff_t upper_limit = MAX_LFS_FILESIZE;
2276
2277         /* small i_blocks in vfs inode? */
2278         if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
2279                 /*
2280                  * CONFIG_LBDAF is not enabled implies the inode
2281                  * i_block represent total blocks in 512 bytes
2282                  * 32 == size of vfs inode i_blocks * 8
2283                  */
2284                 upper_limit = (1LL << 32) - 1;
2285
2286                 /* total blocks in file system block size */
2287                 upper_limit >>= (blkbits - 9);
2288                 upper_limit <<= blkbits;
2289         }
2290
2291         /*
2292          * 32-bit extent-start container, ee_block. We lower the maxbytes
2293          * by one fs block, so ee_len can cover the extent of maximum file
2294          * size
2295          */
2296         res = (1LL << 32) - 1;
2297         res <<= blkbits;
2298
2299         /* Sanity check against vm- & vfs- imposed limits */
2300         if (res > upper_limit)
2301                 res = upper_limit;
2302
2303         return res;
2304 }
2305
2306 /*
2307  * Maximal bitmap file size.  There is a direct, and {,double-,triple-}indirect
2308  * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2309  * We need to be 1 filesystem block less than the 2^48 sector limit.
2310  */
2311 static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
2312 {
2313         loff_t res = EXT4_NDIR_BLOCKS;
2314         int meta_blocks;
2315         loff_t upper_limit;
2316         /* This is calculated to be the largest file size for a dense, block
2317          * mapped file such that the file's total number of 512-byte sectors,
2318          * including data and all indirect blocks, does not exceed (2^48 - 1).
2319          *
2320          * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2321          * number of 512-byte sectors of the file.
2322          */
2323
2324         if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
2325                 /*
2326                  * !has_huge_files or CONFIG_LBDAF not enabled implies that
2327                  * the inode i_block field represents total file blocks in
2328                  * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
2329                  */
2330                 upper_limit = (1LL << 32) - 1;
2331
2332                 /* total blocks in file system block size */
2333                 upper_limit >>= (bits - 9);
2334
2335         } else {
2336                 /*
2337                  * We use 48 bit ext4_inode i_blocks
2338                  * With EXT4_HUGE_FILE_FL set the i_blocks
2339                  * represent total number of blocks in
2340                  * file system block size
2341                  */
2342                 upper_limit = (1LL << 48) - 1;
2343
2344         }
2345
2346         /* indirect blocks */
2347         meta_blocks = 1;
2348         /* double indirect blocks */
2349         meta_blocks += 1 + (1LL << (bits-2));
2350         /* tripple indirect blocks */
2351         meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
2352
2353         upper_limit -= meta_blocks;
2354         upper_limit <<= bits;
2355
2356         res += 1LL << (bits-2);
2357         res += 1LL << (2*(bits-2));
2358         res += 1LL << (3*(bits-2));
2359         res <<= bits;
2360         if (res > upper_limit)
2361                 res = upper_limit;
2362
2363         if (res > MAX_LFS_FILESIZE)
2364                 res = MAX_LFS_FILESIZE;
2365
2366         return res;
2367 }
2368
2369 static ext4_fsblk_t descriptor_loc(struct super_block *sb,
2370                                    ext4_fsblk_t logical_sb_block, int nr)
2371 {
2372         struct ext4_sb_info *sbi = EXT4_SB(sb);
2373         ext4_group_t bg, first_meta_bg;
2374         int has_super = 0;
2375
2376         first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
2377
2378         if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
2379             nr < first_meta_bg)
2380                 return logical_sb_block + nr + 1;
2381         bg = sbi->s_desc_per_block * nr;
2382         if (ext4_bg_has_super(sb, bg))
2383                 has_super = 1;
2384
2385         return (has_super + ext4_group_first_block_no(sb, bg));
2386 }
2387
2388 /**
2389  * ext4_get_stripe_size: Get the stripe size.
2390  * @sbi: In memory super block info
2391  *
2392  * If we have specified it via mount option, then
2393  * use the mount option value. If the value specified at mount time is
2394  * greater than the blocks per group use the super block value.
2395  * If the super block value is greater than blocks per group return 0.
2396  * Allocator needs it be less than blocks per group.
2397  *
2398  */
2399 static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
2400 {
2401         unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
2402         unsigned long stripe_width =
2403                         le32_to_cpu(sbi->s_es->s_raid_stripe_width);
2404         int ret;
2405
2406         if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
2407                 ret = sbi->s_stripe;
2408         else if (stripe_width <= sbi->s_blocks_per_group)
2409                 ret = stripe_width;
2410         else if (stride <= sbi->s_blocks_per_group)
2411                 ret = stride;
2412         else
2413                 ret = 0;
2414
2415         /*
2416          * If the stripe width is 1, this makes no sense and
2417          * we set it to 0 to turn off stripe handling code.
2418          */
2419         if (ret <= 1)
2420                 ret = 0;
2421
2422         return ret;
2423 }
2424
2425 /* sysfs supprt */
2426
2427 struct ext4_attr {
2428         struct attribute attr;
2429         ssize_t (*show)(struct ext4_attr *, struct ext4_sb_info *, char *);
2430         ssize_t (*store)(struct ext4_attr *, struct ext4_sb_info *,
2431                          const char *, size_t);
2432         int offset;
2433 };
2434
2435 static int parse_strtoul(const char *buf,
2436                 unsigned long max, unsigned long *value)
2437 {
2438         char *endp;
2439
2440         *value = simple_strtoul(skip_spaces(buf), &endp, 0);
2441         endp = skip_spaces(endp);
2442         if (*endp || *value > max)
2443                 return -EINVAL;
2444
2445         return 0;
2446 }
2447
2448 static ssize_t delayed_allocation_blocks_show(struct ext4_attr *a,
2449                                               struct ext4_sb_info *sbi,
2450                                               char *buf)
2451 {
2452         return snprintf(buf, PAGE_SIZE, "%llu\n",
2453                 (s64) EXT4_C2B(sbi,
2454                         percpu_counter_sum(&sbi->s_dirtyclusters_counter)));
2455 }
2456
2457 static ssize_t session_write_kbytes_show(struct ext4_attr *a,
2458                                          struct ext4_sb_info *sbi, char *buf)
2459 {
2460         struct super_block *sb = sbi->s_buddy_cache->i_sb;
2461
2462         if (!sb->s_bdev->bd_part)
2463                 return snprintf(buf, PAGE_SIZE, "0\n");
2464         return snprintf(buf, PAGE_SIZE, "%lu\n",
2465                         (part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
2466                          sbi->s_sectors_written_start) >> 1);
2467 }
2468
2469 static ssize_t lifetime_write_kbytes_show(struct ext4_attr *a,
2470                                           struct ext4_sb_info *sbi, char *buf)
2471 {
2472         struct super_block *sb = sbi->s_buddy_cache->i_sb;
2473
2474         if (!sb->s_bdev->bd_part)
2475                 return snprintf(buf, PAGE_SIZE, "0\n");
2476         return snprintf(buf, PAGE_SIZE, "%llu\n",
2477                         (unsigned long long)(sbi->s_kbytes_written +
2478                         ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
2479                           EXT4_SB(sb)->s_sectors_written_start) >> 1)));
2480 }
2481
2482 static ssize_t inode_readahead_blks_store(struct ext4_attr *a,
2483                                           struct ext4_sb_info *sbi,
2484                                           const char *buf, size_t count)
2485 {
2486         unsigned long t;
2487
2488         if (parse_strtoul(buf, 0x40000000, &t))
2489                 return -EINVAL;
2490
2491         if (t && !is_power_of_2(t))
2492                 return -EINVAL;
2493
2494         sbi->s_inode_readahead_blks = t;
2495         return count;
2496 }
2497
2498 static ssize_t sbi_ui_show(struct ext4_attr *a,
2499                            struct ext4_sb_info *sbi, char *buf)
2500 {
2501         unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
2502
2503         return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
2504 }
2505
2506 static ssize_t sbi_ui_store(struct ext4_attr *a,
2507                             struct ext4_sb_info *sbi,
2508                             const char *buf, size_t count)
2509 {
2510         unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
2511         unsigned long t;
2512
2513         if (parse_strtoul(buf, 0xffffffff, &t))
2514                 return -EINVAL;
2515         *ui = t;
2516         return count;
2517 }
2518
2519 static ssize_t trigger_test_error(struct ext4_attr *a,
2520                                   struct ext4_sb_info *sbi,
2521                                   const char *buf, size_t count)
2522 {
2523         int len = count;
2524
2525         if (!capable(CAP_SYS_ADMIN))
2526                 return -EPERM;
2527
2528         if (len && buf[len-1] == '\n')
2529                 len--;
2530
2531         if (len)
2532                 ext4_error(sbi->s_sb, "%.*s", len, buf);
2533         return count;
2534 }
2535
2536 #define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \
2537 static struct ext4_attr ext4_attr_##_name = {                   \
2538         .attr = {.name = __stringify(_name), .mode = _mode },   \
2539         .show   = _show,                                        \
2540         .store  = _store,                                       \
2541         .offset = offsetof(struct ext4_sb_info, _elname),       \
2542 }
2543 #define EXT4_ATTR(name, mode, show, store) \
2544 static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store)
2545
2546 #define EXT4_INFO_ATTR(name) EXT4_ATTR(name, 0444, NULL, NULL)
2547 #define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL)
2548 #define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store)
2549 #define EXT4_RW_ATTR_SBI_UI(name, elname)       \
2550         EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname)
2551 #define ATTR_LIST(name) &ext4_attr_##name.attr
2552
2553 EXT4_RO_ATTR(delayed_allocation_blocks);
2554 EXT4_RO_ATTR(session_write_kbytes);
2555 EXT4_RO_ATTR(lifetime_write_kbytes);
2556 EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, sbi_ui_show,
2557                  inode_readahead_blks_store, s_inode_readahead_blks);
2558 EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal);
2559 EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats);
2560 EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan);
2561 EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan);
2562 EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs);
2563 EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request);
2564 EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc);
2565 EXT4_RW_ATTR_SBI_UI(max_writeback_mb_bump, s_max_writeback_mb_bump);
2566 EXT4_RW_ATTR_SBI_UI(extent_max_zeroout_kb, s_extent_max_zeroout_kb);
2567 EXT4_ATTR(trigger_fs_error, 0200, NULL, trigger_test_error);
2568
2569 static struct attribute *ext4_attrs[] = {
2570         ATTR_LIST(delayed_allocation_blocks),
2571         ATTR_LIST(session_write_kbytes),
2572         ATTR_LIST(lifetime_write_kbytes),
2573         ATTR_LIST(inode_readahead_blks),
2574         ATTR_LIST(inode_goal),
2575         ATTR_LIST(mb_stats),
2576         ATTR_LIST(mb_max_to_scan),
2577         ATTR_LIST(mb_min_to_scan),
2578         ATTR_LIST(mb_order2_req),
2579         ATTR_LIST(mb_stream_req),
2580         ATTR_LIST(mb_group_prealloc),
2581         ATTR_LIST(max_writeback_mb_bump),
2582         ATTR_LIST(extent_max_zeroout_kb),
2583         ATTR_LIST(trigger_fs_error),
2584         NULL,
2585 };
2586
2587 /* Features this copy of ext4 supports */
2588 EXT4_INFO_ATTR(lazy_itable_init);
2589 EXT4_INFO_ATTR(batched_discard);
2590 EXT4_INFO_ATTR(meta_bg_resize);
2591
2592 static struct attribute *ext4_feat_attrs[] = {
2593         ATTR_LIST(lazy_itable_init),
2594         ATTR_LIST(batched_discard),
2595         ATTR_LIST(meta_bg_resize),
2596         NULL,
2597 };
2598
2599 static ssize_t ext4_attr_show(struct kobject *kobj,
2600                               struct attribute *attr, char *buf)
2601 {
2602         struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2603                                                 s_kobj);
2604         struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2605
2606         return a->show ? a->show(a, sbi, buf) : 0;
2607 }
2608
2609 static ssize_t ext4_attr_store(struct kobject *kobj,
2610                                struct attribute *attr,
2611                                const char *buf, size_t len)
2612 {
2613         struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2614                                                 s_kobj);
2615         struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2616
2617         return a->store ? a->store(a, sbi, buf, len) : 0;
2618 }
2619
2620 static void ext4_sb_release(struct kobject *kobj)
2621 {
2622         struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2623                                                 s_kobj);
2624         complete(&sbi->s_kobj_unregister);
2625 }
2626
2627 static const struct sysfs_ops ext4_attr_ops = {
2628         .show   = ext4_attr_show,
2629         .store  = ext4_attr_store,
2630 };
2631
2632 static struct kobj_type ext4_ktype = {
2633         .default_attrs  = ext4_attrs,
2634         .sysfs_ops      = &ext4_attr_ops,
2635         .release        = ext4_sb_release,
2636 };
2637
2638 static void ext4_feat_release(struct kobject *kobj)
2639 {
2640         complete(&ext4_feat->f_kobj_unregister);
2641 }
2642
2643 static struct kobj_type ext4_feat_ktype = {
2644         .default_attrs  = ext4_feat_attrs,
2645         .sysfs_ops      = &ext4_attr_ops,
2646         .release        = ext4_feat_release,
2647 };
2648
2649 /*
2650  * Check whether this filesystem can be mounted based on
2651  * the features present and the RDONLY/RDWR mount requested.
2652  * Returns 1 if this filesystem can be mounted as requested,
2653  * 0 if it cannot be.
2654  */
2655 static int ext4_feature_set_ok(struct super_block *sb, int readonly)
2656 {
2657         if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP)) {
2658                 ext4_msg(sb, KERN_ERR,
2659                         "Couldn't mount because of "
2660                         "unsupported optional features (%x)",
2661                         (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
2662                         ~EXT4_FEATURE_INCOMPAT_SUPP));
2663                 return 0;
2664         }
2665
2666         if (readonly)
2667                 return 1;
2668
2669         /* Check that feature set is OK for a read-write mount */
2670         if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP)) {
2671                 ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of "
2672                          "unsupported optional features (%x)",
2673                          (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
2674                                 ~EXT4_FEATURE_RO_COMPAT_SUPP));
2675                 return 0;
2676         }
2677         /*
2678          * Large file size enabled file system can only be mounted
2679          * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
2680          */
2681         if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) {
2682                 if (sizeof(blkcnt_t) < sizeof(u64)) {
2683                         ext4_msg(sb, KERN_ERR, "Filesystem with huge files "
2684                                  "cannot be mounted RDWR without "
2685                                  "CONFIG_LBDAF");
2686                         return 0;
2687                 }
2688         }
2689         if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_BIGALLOC) &&
2690             !EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS)) {
2691                 ext4_msg(sb, KERN_ERR,
2692                          "Can't support bigalloc feature without "
2693                          "extents feature\n");
2694                 return 0;
2695         }
2696
2697 #ifndef CONFIG_QUOTA
2698         if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) &&
2699             !readonly) {
2700                 ext4_msg(sb, KERN_ERR,
2701                          "Filesystem with quota feature cannot be mounted RDWR "
2702                          "without CONFIG_QUOTA");
2703                 return 0;
2704         }
2705 #endif  /* CONFIG_QUOTA */
2706         return 1;
2707 }
2708
2709 /*
2710  * This function is called once a day if we have errors logged
2711  * on the file system
2712  */
2713 static void print_daily_error_info(unsigned long arg)
2714 {
2715         struct super_block *sb = (struct super_block *) arg;
2716         struct ext4_sb_info *sbi;
2717         struct ext4_super_block *es;
2718
2719         sbi = EXT4_SB(sb);
2720         es = sbi->s_es;
2721
2722         if (es->s_error_count)
2723                 ext4_msg(sb, KERN_NOTICE, "error count: %u",
2724                          le32_to_cpu(es->s_error_count));
2725         if (es->s_first_error_time) {
2726                 printk(KERN_NOTICE "EXT4-fs (%s): initial error at %u: %.*s:%d",
2727                        sb->s_id, le32_to_cpu(es->s_first_error_time),
2728                        (int) sizeof(es->s_first_error_func),
2729                        es->s_first_error_func,
2730                        le32_to_cpu(es->s_first_error_line));
2731                 if (es->s_first_error_ino)
2732                         printk(": inode %u",
2733                                le32_to_cpu(es->s_first_error_ino));
2734                 if (es->s_first_error_block)
2735                         printk(": block %llu", (unsigned long long)
2736                                le64_to_cpu(es->s_first_error_block));
2737                 printk("\n");
2738         }
2739         if (es->s_last_error_time) {
2740                 printk(KERN_NOTICE "EXT4-fs (%s): last error at %u: %.*s:%d",
2741                        sb->s_id, le32_to_cpu(es->s_last_error_time),
2742                        (int) sizeof(es->s_last_error_func),
2743                        es->s_last_error_func,
2744                        le32_to_cpu(es->s_last_error_line));
2745                 if (es->s_last_error_ino)
2746                         printk(": inode %u",
2747                                le32_to_cpu(es->s_last_error_ino));
2748                 if (es->s_last_error_block)
2749                         printk(": block %llu", (unsigned long long)
2750                                le64_to_cpu(es->s_last_error_block));
2751                 printk("\n");
2752         }
2753         mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ);  /* Once a day */
2754 }
2755
2756 /* Find next suitable group and run ext4_init_inode_table */
2757 static int ext4_run_li_request(struct ext4_li_request *elr)
2758 {
2759         struct ext4_group_desc *gdp = NULL;
2760         ext4_group_t group, ngroups;
2761         struct super_block *sb;
2762         unsigned long timeout = 0;
2763         int ret = 0;
2764
2765         sb = elr->lr_super;
2766         ngroups = EXT4_SB(sb)->s_groups_count;
2767
2768         sb_start_write(sb);
2769         for (group = elr->lr_next_group; group < ngroups; group++) {
2770                 gdp = ext4_get_group_desc(sb, group, NULL);
2771                 if (!gdp) {
2772                         ret = 1;
2773                         break;
2774                 }
2775
2776                 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2777                         break;
2778         }
2779
2780         if (group == ngroups)
2781                 ret = 1;
2782
2783         if (!ret) {
2784                 timeout = jiffies;
2785                 ret = ext4_init_inode_table(sb, group,
2786                                             elr->lr_timeout ? 0 : 1);
2787                 if (elr->lr_timeout == 0) {
2788                         timeout = (jiffies - timeout) *
2789                                   elr->lr_sbi->s_li_wait_mult;
2790                         elr->lr_timeout = timeout;
2791                 }
2792                 elr->lr_next_sched = jiffies + elr->lr_timeout;
2793                 elr->lr_next_group = group + 1;
2794         }
2795         sb_end_write(sb);
2796
2797         return ret;
2798 }
2799
2800 /*
2801  * Remove lr_request from the list_request and free the
2802  * request structure. Should be called with li_list_mtx held
2803  */
2804 static void ext4_remove_li_request(struct ext4_li_request *elr)
2805 {
2806         struct ext4_sb_info *sbi;
2807
2808         if (!elr)
2809                 return;
2810
2811         sbi = elr->lr_sbi;
2812
2813         list_del(&elr->lr_request);
2814         sbi->s_li_request = NULL;
2815         kfree(elr);
2816 }
2817
2818 static void ext4_unregister_li_request(struct super_block *sb)
2819 {
2820         mutex_lock(&ext4_li_mtx);
2821         if (!ext4_li_info) {
2822                 mutex_unlock(&ext4_li_mtx);
2823                 return;
2824         }
2825
2826         mutex_lock(&ext4_li_info->li_list_mtx);
2827         ext4_remove_li_request(EXT4_SB(sb)->s_li_request);
2828         mutex_unlock(&ext4_li_info->li_list_mtx);
2829         mutex_unlock(&ext4_li_mtx);
2830 }
2831
2832 static struct task_struct *ext4_lazyinit_task;
2833
2834 /*
2835  * This is the function where ext4lazyinit thread lives. It walks
2836  * through the request list searching for next scheduled filesystem.
2837  * When such a fs is found, run the lazy initialization request
2838  * (ext4_rn_li_request) and keep track of the time spend in this
2839  * function. Based on that time we compute next schedule time of
2840  * the request. When walking through the list is complete, compute
2841  * next waking time and put itself into sleep.
2842  */
2843 static int ext4_lazyinit_thread(void *arg)
2844 {
2845         struct ext4_lazy_init *eli = (struct ext4_lazy_init *)arg;
2846         struct list_head *pos, *n;
2847         struct ext4_li_request *elr;
2848         unsigned long next_wakeup, cur;
2849
2850         BUG_ON(NULL == eli);
2851
2852 cont_thread:
2853         while (true) {
2854                 next_wakeup = MAX_JIFFY_OFFSET;
2855
2856                 mutex_lock(&eli->li_list_mtx);
2857                 if (list_empty(&eli->li_request_list)) {
2858                         mutex_unlock(&eli->li_list_mtx);
2859                         goto exit_thread;
2860                 }
2861
2862                 list_for_each_safe(pos, n, &eli->li_request_list) {
2863                         elr = list_entry(pos, struct ext4_li_request,
2864                                          lr_request);
2865
2866                         if (time_after_eq(jiffies, elr->lr_next_sched)) {
2867                                 if (ext4_run_li_request(elr) != 0) {
2868                                         /* error, remove the lazy_init job */
2869                                         ext4_remove_li_request(elr);
2870                                         continue;
2871                                 }
2872                         }
2873
2874                         if (time_before(elr->lr_next_sched, next_wakeup))
2875                                 next_wakeup = elr->lr_next_sched;
2876                 }
2877                 mutex_unlock(&eli->li_list_mtx);
2878
2879                 try_to_freeze();
2880
2881                 cur = jiffies;
2882                 if ((time_after_eq(cur, next_wakeup)) ||
2883                     (MAX_JIFFY_OFFSET == next_wakeup)) {
2884                         cond_resched();
2885                         continue;
2886                 }
2887
2888                 schedule_timeout_interruptible(next_wakeup - cur);
2889
2890                 if (kthread_should_stop()) {
2891                         ext4_clear_request_list();
2892                         goto exit_thread;
2893                 }
2894         }
2895
2896 exit_thread:
2897         /*
2898          * It looks like the request list is empty, but we need
2899          * to check it under the li_list_mtx lock, to prevent any
2900          * additions into it, and of course we should lock ext4_li_mtx
2901          * to atomically free the list and ext4_li_info, because at
2902          * this point another ext4 filesystem could be registering
2903          * new one.
2904          */
2905         mutex_lock(&ext4_li_mtx);
2906         mutex_lock(&eli->li_list_mtx);
2907         if (!list_empty(&eli->li_request_list)) {
2908                 mutex_unlock(&eli->li_list_mtx);
2909                 mutex_unlock(&ext4_li_mtx);
2910                 goto cont_thread;
2911         }
2912         mutex_unlock(&eli->li_list_mtx);
2913         kfree(ext4_li_info);
2914         ext4_li_info = NULL;
2915         mutex_unlock(&ext4_li_mtx);
2916
2917         return 0;
2918 }
2919
2920 static void ext4_clear_request_list(void)
2921 {
2922         struct list_head *pos, *n;
2923         struct ext4_li_request *elr;
2924
2925         mutex_lock(&ext4_li_info->li_list_mtx);
2926         list_for_each_safe(pos, n, &ext4_li_info->li_request_list) {
2927                 elr = list_entry(pos, struct ext4_li_request,
2928                                  lr_request);
2929                 ext4_remove_li_request(elr);
2930         }
2931         mutex_unlock(&ext4_li_info->li_list_mtx);
2932 }
2933
2934 static int ext4_run_lazyinit_thread(void)
2935 {
2936         ext4_lazyinit_task = kthread_run(ext4_lazyinit_thread,
2937                                          ext4_li_info, "ext4lazyinit");
2938         if (IS_ERR(ext4_lazyinit_task)) {
2939                 int err = PTR_ERR(ext4_lazyinit_task);
2940                 ext4_clear_request_list();
2941                 kfree(ext4_li_info);
2942                 ext4_li_info = NULL;
2943                 printk(KERN_CRIT "EXT4-fs: error %d creating inode table "
2944                                  "initialization thread\n",
2945                                  err);
2946                 return err;
2947         }
2948         ext4_li_info->li_state |= EXT4_LAZYINIT_RUNNING;
2949         return 0;
2950 }
2951
2952 /*
2953  * Check whether it make sense to run itable init. thread or not.
2954  * If there is at least one uninitialized inode table, return
2955  * corresponding group number, else the loop goes through all
2956  * groups and return total number of groups.
2957  */
2958 static ext4_group_t ext4_has_uninit_itable(struct super_block *sb)
2959 {
2960         ext4_group_t group, ngroups = EXT4_SB(sb)->s_groups_count;
2961         struct ext4_group_desc *gdp = NULL;
2962
2963         for (group = 0; group < ngroups; group++) {
2964                 gdp = ext4_get_group_desc(sb, group, NULL);
2965                 if (!gdp)
2966                         continue;
2967
2968                 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2969                         break;
2970         }
2971
2972         return group;
2973 }
2974
2975 static int ext4_li_info_new(void)
2976 {
2977         struct ext4_lazy_init *eli = NULL;
2978
2979         eli = kzalloc(sizeof(*eli), GFP_KERNEL);
2980         if (!eli)
2981                 return -ENOMEM;
2982
2983         INIT_LIST_HEAD(&eli->li_request_list);
2984         mutex_init(&eli->li_list_mtx);
2985
2986         eli->li_state |= EXT4_LAZYINIT_QUIT;
2987
2988         ext4_li_info = eli;
2989
2990         return 0;
2991 }
2992
2993 static struct ext4_li_request *ext4_li_request_new(struct super_block *sb,
2994                                             ext4_group_t start)
2995 {
2996         struct ext4_sb_info *sbi = EXT4_SB(sb);
2997         struct ext4_li_request *elr;
2998         unsigned long rnd;
2999
3000         elr = kzalloc(sizeof(*elr), GFP_KERNEL);
3001         if (!elr)
3002                 return NULL;
3003
3004         elr->lr_super = sb;
3005         elr->lr_sbi = sbi;
3006         elr->lr_next_group = start;
3007
3008         /*
3009          * Randomize first schedule time of the request to
3010          * spread the inode table initialization requests
3011          * better.
3012          */
3013         get_random_bytes(&rnd, sizeof(rnd));
3014         elr->lr_next_sched = jiffies + (unsigned long)rnd %
3015                              (EXT4_DEF_LI_MAX_START_DELAY * HZ);
3016
3017         return elr;
3018 }
3019
3020 static int ext4_register_li_request(struct super_block *sb,
3021                                     ext4_group_t first_not_zeroed)
3022 {
3023         struct ext4_sb_info *sbi = EXT4_SB(sb);
3024         struct ext4_li_request *elr;
3025         ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
3026         int ret = 0;
3027
3028         if (sbi->s_li_request != NULL) {
3029                 /*
3030                  * Reset timeout so it can be computed again, because
3031                  * s_li_wait_mult might have changed.
3032                  */
3033                 sbi->s_li_request->lr_timeout = 0;
3034                 return 0;
3035         }
3036
3037         if (first_not_zeroed == ngroups ||
3038             (sb->s_flags & MS_RDONLY) ||
3039             !test_opt(sb, INIT_INODE_TABLE))
3040                 return 0;
3041
3042         elr = ext4_li_request_new(sb, first_not_zeroed);
3043         if (!elr)
3044                 return -ENOMEM;
3045
3046         mutex_lock(&ext4_li_mtx);
3047
3048         if (NULL == ext4_li_info) {
3049                 ret = ext4_li_info_new();
3050                 if (ret)
3051                         goto out;
3052         }
3053
3054         mutex_lock(&ext4_li_info->li_list_mtx);
3055         list_add(&elr->lr_request, &ext4_li_info->li_request_list);
3056         mutex_unlock(&ext4_li_info->li_list_mtx);
3057
3058         sbi->s_li_request = elr;
3059         /*
3060          * set elr to NULL here since it has been inserted to
3061          * the request_list and the removal and free of it is
3062          * handled by ext4_clear_request_list from now on.
3063          */
3064         elr = NULL;
3065
3066         if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) {
3067                 ret = ext4_run_lazyinit_thread();
3068                 if (ret)
3069                         goto out;
3070         }
3071 out:
3072         mutex_unlock(&ext4_li_mtx);
3073         if (ret)
3074                 kfree(elr);
3075         return ret;
3076 }
3077
3078 /*
3079  * We do not need to lock anything since this is called on
3080  * module unload.
3081  */
3082 static void ext4_destroy_lazyinit_thread(void)
3083 {
3084         /*
3085          * If thread exited earlier
3086          * there's nothing to be done.
3087          */
3088         if (!ext4_li_info || !ext4_lazyinit_task)
3089                 return;
3090
3091         kthread_stop(ext4_lazyinit_task);
3092 }
3093
3094 static int set_journal_csum_feature_set(struct super_block *sb)
3095 {
3096         int ret = 1;
3097         int compat, incompat;
3098         struct ext4_sb_info *sbi = EXT4_SB(sb);
3099
3100         if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3101                                        EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) {
3102                 /* journal checksum v2 */
3103                 compat = 0;
3104                 incompat = JBD2_FEATURE_INCOMPAT_CSUM_V2;
3105         } else {
3106                 /* journal checksum v1 */
3107                 compat = JBD2_FEATURE_COMPAT_CHECKSUM;
3108                 incompat = 0;
3109         }
3110
3111         if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
3112                 ret = jbd2_journal_set_features(sbi->s_journal,
3113                                 compat, 0,
3114                                 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT |
3115                                 incompat);
3116         } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
3117                 ret = jbd2_journal_set_features(sbi->s_journal,
3118                                 compat, 0,
3119                                 incompat);
3120                 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
3121                                 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
3122         } else {
3123                 jbd2_journal_clear_features(sbi->s_journal,
3124                                 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
3125                                 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT |
3126                                 JBD2_FEATURE_INCOMPAT_CSUM_V2);
3127         }
3128
3129         return ret;
3130 }
3131
3132 /*
3133  * Note: calculating the overhead so we can be compatible with
3134  * historical BSD practice is quite difficult in the face of
3135  * clusters/bigalloc.  This is because multiple metadata blocks from
3136  * different block group can end up in the same allocation cluster.
3137  * Calculating the exact overhead in the face of clustered allocation
3138  * requires either O(all block bitmaps) in memory or O(number of block
3139  * groups**2) in time.  We will still calculate the superblock for
3140  * older file systems --- and if we come across with a bigalloc file
3141  * system with zero in s_overhead_clusters the estimate will be close to
3142  * correct especially for very large cluster sizes --- but for newer
3143  * file systems, it's better to calculate this figure once at mkfs
3144  * time, and store it in the superblock.  If the superblock value is
3145  * present (even for non-bigalloc file systems), we will use it.
3146  */
3147 static int count_overhead(struct super_block *sb, ext4_group_t grp,
3148                           char *buf)
3149 {
3150         struct ext4_sb_info     *sbi = EXT4_SB(sb);
3151         struct ext4_group_desc  *gdp;
3152         ext4_fsblk_t            first_block, last_block, b;
3153         ext4_group_t            i, ngroups = ext4_get_groups_count(sb);
3154         int                     s, j, count = 0;
3155
3156         if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_BIGALLOC))
3157                 return (ext4_bg_has_super(sb, grp) + ext4_bg_num_gdb(sb, grp) +
3158                         sbi->s_itb_per_group + 2);
3159
3160         first_block = le32_to_cpu(sbi->s_es->s_first_data_block) +
3161                 (grp * EXT4_BLOCKS_PER_GROUP(sb));
3162         last_block = first_block + EXT4_BLOCKS_PER_GROUP(sb) - 1;
3163         for (i = 0; i < ngroups; i++) {
3164                 gdp = ext4_get_group_desc(sb, i, NULL);
3165                 b = ext4_block_bitmap(sb, gdp);
3166                 if (b >= first_block && b <= last_block) {
3167                         ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3168                         count++;
3169                 }
3170                 b = ext4_inode_bitmap(sb, gdp);
3171                 if (b >= first_block && b <= last_block) {
3172                         ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3173                         count++;
3174                 }
3175                 b = ext4_inode_table(sb, gdp);
3176                 if (b >= first_block && b + sbi->s_itb_per_group <= last_block)
3177                         for (j = 0; j < sbi->s_itb_per_group; j++, b++) {
3178                                 int c = EXT4_B2C(sbi, b - first_block);
3179                                 ext4_set_bit(c, buf);
3180                                 count++;
3181                         }
3182                 if (i != grp)
3183                         continue;
3184                 s = 0;
3185                 if (ext4_bg_has_super(sb, grp)) {
3186                         ext4_set_bit(s++, buf);
3187                         count++;
3188                 }
3189                 for (j = ext4_bg_num_gdb(sb, grp); j > 0; j--) {
3190                         ext4_set_bit(EXT4_B2C(sbi, s++), buf);
3191                         count++;
3192                 }
3193         }
3194         if (!count)
3195                 return 0;
3196         return EXT4_CLUSTERS_PER_GROUP(sb) -
3197                 ext4_count_free(buf, EXT4_CLUSTERS_PER_GROUP(sb) / 8);
3198 }
3199
3200 /*
3201  * Compute the overhead and stash it in sbi->s_overhead
3202  */
3203 int ext4_calculate_overhead(struct super_block *sb)
3204 {
3205         struct ext4_sb_info *sbi = EXT4_SB(sb);
3206         struct ext4_super_block *es = sbi->s_es;
3207         ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3208         ext4_fsblk_t overhead = 0;
3209         char *buf = (char *) get_zeroed_page(GFP_KERNEL);
3210
3211         memset(buf, 0, PAGE_SIZE);
3212         if (!buf)
3213                 return -ENOMEM;
3214
3215         /*
3216          * Compute the overhead (FS structures).  This is constant
3217          * for a given filesystem unless the number of block groups
3218          * changes so we cache the previous value until it does.
3219          */
3220
3221         /*
3222          * All of the blocks before first_data_block are overhead
3223          */
3224         overhead = EXT4_B2C(sbi, le32_to_cpu(es->s_first_data_block));
3225
3226         /*
3227          * Add the overhead found in each block group
3228          */
3229         for (i = 0; i < ngroups; i++) {
3230                 int blks;
3231
3232                 blks = count_overhead(sb, i, buf);
3233                 overhead += blks;
3234                 if (blks)
3235                         memset(buf, 0, PAGE_SIZE);
3236                 cond_resched();
3237         }
3238         sbi->s_overhead = overhead;
3239         smp_wmb();
3240         free_page((unsigned long) buf);
3241         return 0;
3242 }
3243
3244 static int ext4_fill_super(struct super_block *sb, void *data, int silent)
3245 {
3246         char *orig_data = kstrdup(data, GFP_KERNEL);
3247         struct buffer_head *bh;
3248         struct ext4_super_block *es = NULL;
3249         struct ext4_sb_info *sbi;
3250         ext4_fsblk_t block;
3251         ext4_fsblk_t sb_block = get_sb_block(&data);
3252         ext4_fsblk_t logical_sb_block;
3253         unsigned long offset = 0;
3254         unsigned long journal_devnum = 0;
3255         unsigned long def_mount_opts;
3256         struct inode *root;
3257         char *cp;
3258         const char *descr;
3259         int ret = -ENOMEM;
3260         int blocksize, clustersize;
3261         unsigned int db_count;
3262         unsigned int i;
3263         int needs_recovery, has_huge_files, has_bigalloc;
3264         __u64 blocks_count;
3265         int err;
3266         unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
3267         ext4_group_t first_not_zeroed;
3268
3269         sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
3270         if (!sbi)
3271                 goto out_free_orig;
3272
3273         sbi->s_blockgroup_lock =
3274                 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
3275         if (!sbi->s_blockgroup_lock) {
3276                 kfree(sbi);
3277                 goto out_free_orig;
3278         }
3279         sb->s_fs_info = sbi;
3280         sbi->s_sb = sb;
3281         sbi->s_mount_opt = 0;
3282         sbi->s_resuid = make_kuid(&init_user_ns, EXT4_DEF_RESUID);
3283         sbi->s_resgid = make_kgid(&init_user_ns, EXT4_DEF_RESGID);
3284         sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
3285         sbi->s_sb_block = sb_block;
3286         if (sb->s_bdev->bd_part)
3287                 sbi->s_sectors_written_start =
3288                         part_stat_read(sb->s_bdev->bd_part, sectors[1]);
3289
3290         /* Cleanup superblock name */
3291         for (cp = sb->s_id; (cp = strchr(cp, '/'));)
3292                 *cp = '!';
3293
3294         ret = -EINVAL;
3295         blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
3296         if (!blocksize) {
3297                 ext4_msg(sb, KERN_ERR, "unable to set blocksize");
3298                 goto out_fail;
3299         }
3300
3301         /*
3302          * The ext4 superblock will not be buffer aligned for other than 1kB
3303          * block sizes.  We need to calculate the offset from buffer start.
3304          */
3305         if (blocksize != EXT4_MIN_BLOCK_SIZE) {
3306                 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3307                 offset = do_div(logical_sb_block, blocksize);
3308         } else {
3309                 logical_sb_block = sb_block;
3310         }
3311
3312         if (!(bh = sb_bread(sb, logical_sb_block))) {
3313                 ext4_msg(sb, KERN_ERR, "unable to read superblock");
3314                 goto out_fail;
3315         }
3316         /*
3317          * Note: s_es must be initialized as soon as possible because
3318          *       some ext4 macro-instructions depend on its value
3319          */
3320         es = (struct ext4_super_block *) (bh->b_data + offset);
3321         sbi->s_es = es;
3322         sb->s_magic = le16_to_cpu(es->s_magic);
3323         if (sb->s_magic != EXT4_SUPER_MAGIC)
3324                 goto cantfind_ext4;
3325         sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
3326
3327         /* Warn if metadata_csum and gdt_csum are both set. */
3328         if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3329                                        EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) &&
3330             EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_GDT_CSUM))
3331                 ext4_warning(sb, KERN_INFO "metadata_csum and uninit_bg are "
3332                              "redundant flags; please run fsck.");
3333
3334         /* Check for a known checksum algorithm */
3335         if (!ext4_verify_csum_type(sb, es)) {
3336                 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3337                          "unknown checksum algorithm.");
3338                 silent = 1;
3339                 goto cantfind_ext4;
3340         }
3341
3342         /* Load the checksum driver */
3343         if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3344                                        EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) {
3345                 sbi->s_chksum_driver = crypto_alloc_shash("crc32c", 0, 0);
3346                 if (IS_ERR(sbi->s_chksum_driver)) {
3347                         ext4_msg(sb, KERN_ERR, "Cannot load crc32c driver.");
3348                         ret = PTR_ERR(sbi->s_chksum_driver);
3349                         sbi->s_chksum_driver = NULL;
3350                         goto failed_mount;
3351                 }
3352         }
3353
3354         /* Check superblock checksum */
3355         if (!ext4_superblock_csum_verify(sb, es)) {
3356                 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3357                          "invalid superblock checksum.  Run e2fsck?");
3358                 silent = 1;
3359                 goto cantfind_ext4;
3360         }
3361
3362         /* Precompute checksum seed for all metadata */
3363         if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3364                         EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
3365                 sbi->s_csum_seed = ext4_chksum(sbi, ~0, es->s_uuid,
3366                                                sizeof(es->s_uuid));
3367
3368         /* Set defaults before we parse the mount options */
3369         def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
3370         set_opt(sb, INIT_INODE_TABLE);
3371         if (def_mount_opts & EXT4_DEFM_DEBUG)
3372                 set_opt(sb, DEBUG);
3373         if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
3374                 set_opt(sb, GRPID);
3375         if (def_mount_opts & EXT4_DEFM_UID16)
3376                 set_opt(sb, NO_UID32);
3377         /* xattr user namespace & acls are now defaulted on */
3378 #ifdef CONFIG_EXT4_FS_XATTR
3379         set_opt(sb, XATTR_USER);
3380 #endif
3381 #ifdef CONFIG_EXT4_FS_POSIX_ACL
3382         set_opt(sb, POSIX_ACL);
3383 #endif
3384         set_opt(sb, MBLK_IO_SUBMIT);
3385         if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
3386                 set_opt(sb, JOURNAL_DATA);
3387         else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
3388                 set_opt(sb, ORDERED_DATA);
3389         else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4