Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux...
[pandora-kernel.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 <asm/uaccess.h>
42
43 #include <linux/kthread.h>
44 #include <linux/freezer.h>
45
46 #include "ext4.h"
47 #include "ext4_jbd2.h"
48 #include "xattr.h"
49 #include "acl.h"
50 #include "mballoc.h"
51
52 #define CREATE_TRACE_POINTS
53 #include <trace/events/ext4.h>
54
55 static struct proc_dir_entry *ext4_proc_root;
56 static struct kset *ext4_kset;
57 struct ext4_lazy_init *ext4_li_info;
58 struct mutex ext4_li_mtx;
59 struct ext4_features *ext4_feat;
60
61 static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
62                              unsigned long journal_devnum);
63 static int ext4_commit_super(struct super_block *sb, int sync);
64 static void ext4_mark_recovery_complete(struct super_block *sb,
65                                         struct ext4_super_block *es);
66 static void ext4_clear_journal_err(struct super_block *sb,
67                                    struct ext4_super_block *es);
68 static int ext4_sync_fs(struct super_block *sb, int wait);
69 static const char *ext4_decode_error(struct super_block *sb, int errno,
70                                      char nbuf[16]);
71 static int ext4_remount(struct super_block *sb, int *flags, char *data);
72 static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
73 static int ext4_unfreeze(struct super_block *sb);
74 static void ext4_write_super(struct super_block *sb);
75 static int ext4_freeze(struct super_block *sb);
76 static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
77                        const char *dev_name, void *data);
78 static void ext4_destroy_lazyinit_thread(void);
79 static void ext4_unregister_li_request(struct super_block *sb);
80
81 #if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
82 static struct file_system_type ext3_fs_type = {
83         .owner          = THIS_MODULE,
84         .name           = "ext3",
85         .mount          = ext4_mount,
86         .kill_sb        = kill_block_super,
87         .fs_flags       = FS_REQUIRES_DEV,
88 };
89 #define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type)
90 #else
91 #define IS_EXT3_SB(sb) (0)
92 #endif
93
94 ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
95                                struct ext4_group_desc *bg)
96 {
97         return le32_to_cpu(bg->bg_block_bitmap_lo) |
98                 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
99                  (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
100 }
101
102 ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
103                                struct ext4_group_desc *bg)
104 {
105         return le32_to_cpu(bg->bg_inode_bitmap_lo) |
106                 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
107                  (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
108 }
109
110 ext4_fsblk_t ext4_inode_table(struct super_block *sb,
111                               struct ext4_group_desc *bg)
112 {
113         return le32_to_cpu(bg->bg_inode_table_lo) |
114                 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
115                  (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
116 }
117
118 __u32 ext4_free_blks_count(struct super_block *sb,
119                               struct ext4_group_desc *bg)
120 {
121         return le16_to_cpu(bg->bg_free_blocks_count_lo) |
122                 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
123                  (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0);
124 }
125
126 __u32 ext4_free_inodes_count(struct super_block *sb,
127                               struct ext4_group_desc *bg)
128 {
129         return le16_to_cpu(bg->bg_free_inodes_count_lo) |
130                 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
131                  (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0);
132 }
133
134 __u32 ext4_used_dirs_count(struct super_block *sb,
135                               struct ext4_group_desc *bg)
136 {
137         return le16_to_cpu(bg->bg_used_dirs_count_lo) |
138                 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
139                  (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0);
140 }
141
142 __u32 ext4_itable_unused_count(struct super_block *sb,
143                               struct ext4_group_desc *bg)
144 {
145         return le16_to_cpu(bg->bg_itable_unused_lo) |
146                 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
147                  (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0);
148 }
149
150 void ext4_block_bitmap_set(struct super_block *sb,
151                            struct ext4_group_desc *bg, ext4_fsblk_t blk)
152 {
153         bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
154         if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
155                 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
156 }
157
158 void ext4_inode_bitmap_set(struct super_block *sb,
159                            struct ext4_group_desc *bg, ext4_fsblk_t blk)
160 {
161         bg->bg_inode_bitmap_lo  = cpu_to_le32((u32)blk);
162         if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
163                 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
164 }
165
166 void ext4_inode_table_set(struct super_block *sb,
167                           struct ext4_group_desc *bg, ext4_fsblk_t blk)
168 {
169         bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
170         if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
171                 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
172 }
173
174 void ext4_free_blks_set(struct super_block *sb,
175                           struct ext4_group_desc *bg, __u32 count)
176 {
177         bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count);
178         if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
179                 bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16);
180 }
181
182 void ext4_free_inodes_set(struct super_block *sb,
183                           struct ext4_group_desc *bg, __u32 count)
184 {
185         bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count);
186         if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
187                 bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16);
188 }
189
190 void ext4_used_dirs_set(struct super_block *sb,
191                           struct ext4_group_desc *bg, __u32 count)
192 {
193         bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count);
194         if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
195                 bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16);
196 }
197
198 void ext4_itable_unused_set(struct super_block *sb,
199                           struct ext4_group_desc *bg, __u32 count)
200 {
201         bg->bg_itable_unused_lo = cpu_to_le16((__u16)count);
202         if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
203                 bg->bg_itable_unused_hi = cpu_to_le16(count >> 16);
204 }
205
206
207 /* Just increment the non-pointer handle value */
208 static handle_t *ext4_get_nojournal(void)
209 {
210         handle_t *handle = current->journal_info;
211         unsigned long ref_cnt = (unsigned long)handle;
212
213         BUG_ON(ref_cnt >= EXT4_NOJOURNAL_MAX_REF_COUNT);
214
215         ref_cnt++;
216         handle = (handle_t *)ref_cnt;
217
218         current->journal_info = handle;
219         return handle;
220 }
221
222
223 /* Decrement the non-pointer handle value */
224 static void ext4_put_nojournal(handle_t *handle)
225 {
226         unsigned long ref_cnt = (unsigned long)handle;
227
228         BUG_ON(ref_cnt == 0);
229
230         ref_cnt--;
231         handle = (handle_t *)ref_cnt;
232
233         current->journal_info = handle;
234 }
235
236 /*
237  * Wrappers for jbd2_journal_start/end.
238  *
239  * The only special thing we need to do here is to make sure that all
240  * journal_end calls result in the superblock being marked dirty, so
241  * that sync() will call the filesystem's write_super callback if
242  * appropriate.
243  */
244 handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks)
245 {
246         journal_t *journal;
247
248         if (sb->s_flags & MS_RDONLY)
249                 return ERR_PTR(-EROFS);
250
251         vfs_check_frozen(sb, SB_FREEZE_TRANS);
252         /* Special case here: if the journal has aborted behind our
253          * backs (eg. EIO in the commit thread), then we still need to
254          * take the FS itself readonly cleanly. */
255         journal = EXT4_SB(sb)->s_journal;
256         if (journal) {
257                 if (is_journal_aborted(journal)) {
258                         ext4_abort(sb, "Detected aborted journal");
259                         return ERR_PTR(-EROFS);
260                 }
261                 return jbd2_journal_start(journal, nblocks);
262         }
263         return ext4_get_nojournal();
264 }
265
266 /*
267  * The only special thing we need to do here is to make sure that all
268  * jbd2_journal_stop calls result in the superblock being marked dirty, so
269  * that sync() will call the filesystem's write_super callback if
270  * appropriate.
271  */
272 int __ext4_journal_stop(const char *where, unsigned int line, handle_t *handle)
273 {
274         struct super_block *sb;
275         int err;
276         int rc;
277
278         if (!ext4_handle_valid(handle)) {
279                 ext4_put_nojournal(handle);
280                 return 0;
281         }
282         sb = handle->h_transaction->t_journal->j_private;
283         err = handle->h_err;
284         rc = jbd2_journal_stop(handle);
285
286         if (!err)
287                 err = rc;
288         if (err)
289                 __ext4_std_error(sb, where, line, err);
290         return err;
291 }
292
293 void ext4_journal_abort_handle(const char *caller, unsigned int line,
294                                const char *err_fn, struct buffer_head *bh,
295                                handle_t *handle, int err)
296 {
297         char nbuf[16];
298         const char *errstr = ext4_decode_error(NULL, err, nbuf);
299
300         BUG_ON(!ext4_handle_valid(handle));
301
302         if (bh)
303                 BUFFER_TRACE(bh, "abort");
304
305         if (!handle->h_err)
306                 handle->h_err = err;
307
308         if (is_handle_aborted(handle))
309                 return;
310
311         printk(KERN_ERR "%s:%d: aborting transaction: %s in %s\n",
312                caller, line, errstr, err_fn);
313
314         jbd2_journal_abort_handle(handle);
315 }
316
317 static void __save_error_info(struct super_block *sb, const char *func,
318                             unsigned int line)
319 {
320         struct ext4_super_block *es = EXT4_SB(sb)->s_es;
321
322         EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
323         es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
324         es->s_last_error_time = cpu_to_le32(get_seconds());
325         strncpy(es->s_last_error_func, func, sizeof(es->s_last_error_func));
326         es->s_last_error_line = cpu_to_le32(line);
327         if (!es->s_first_error_time) {
328                 es->s_first_error_time = es->s_last_error_time;
329                 strncpy(es->s_first_error_func, func,
330                         sizeof(es->s_first_error_func));
331                 es->s_first_error_line = cpu_to_le32(line);
332                 es->s_first_error_ino = es->s_last_error_ino;
333                 es->s_first_error_block = es->s_last_error_block;
334         }
335         /*
336          * Start the daily error reporting function if it hasn't been
337          * started already
338          */
339         if (!es->s_error_count)
340                 mod_timer(&EXT4_SB(sb)->s_err_report, jiffies + 24*60*60*HZ);
341         es->s_error_count = cpu_to_le32(le32_to_cpu(es->s_error_count) + 1);
342 }
343
344 static void save_error_info(struct super_block *sb, const char *func,
345                             unsigned int line)
346 {
347         __save_error_info(sb, func, line);
348         ext4_commit_super(sb, 1);
349 }
350
351
352 /* Deal with the reporting of failure conditions on a filesystem such as
353  * inconsistencies detected or read IO failures.
354  *
355  * On ext2, we can store the error state of the filesystem in the
356  * superblock.  That is not possible on ext4, because we may have other
357  * write ordering constraints on the superblock which prevent us from
358  * writing it out straight away; and given that the journal is about to
359  * be aborted, we can't rely on the current, or future, transactions to
360  * write out the superblock safely.
361  *
362  * We'll just use the jbd2_journal_abort() error code to record an error in
363  * the journal instead.  On recovery, the journal will complain about
364  * that error until we've noted it down and cleared it.
365  */
366
367 static void ext4_handle_error(struct super_block *sb)
368 {
369         if (sb->s_flags & MS_RDONLY)
370                 return;
371
372         if (!test_opt(sb, ERRORS_CONT)) {
373                 journal_t *journal = EXT4_SB(sb)->s_journal;
374
375                 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
376                 if (journal)
377                         jbd2_journal_abort(journal, -EIO);
378         }
379         if (test_opt(sb, ERRORS_RO)) {
380                 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
381                 sb->s_flags |= MS_RDONLY;
382         }
383         if (test_opt(sb, ERRORS_PANIC))
384                 panic("EXT4-fs (device %s): panic forced after error\n",
385                         sb->s_id);
386 }
387
388 void __ext4_error(struct super_block *sb, const char *function,
389                   unsigned int line, const char *fmt, ...)
390 {
391         va_list args;
392
393         va_start(args, fmt);
394         printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: comm %s: ",
395                sb->s_id, function, line, current->comm);
396         vprintk(fmt, args);
397         printk("\n");
398         va_end(args);
399
400         ext4_handle_error(sb);
401 }
402
403 void ext4_error_inode(struct inode *inode, const char *function,
404                       unsigned int line, ext4_fsblk_t block,
405                       const char *fmt, ...)
406 {
407         va_list args;
408         struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
409
410         es->s_last_error_ino = cpu_to_le32(inode->i_ino);
411         es->s_last_error_block = cpu_to_le64(block);
412         save_error_info(inode->i_sb, function, line);
413         va_start(args, fmt);
414         printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: inode #%lu: ",
415                inode->i_sb->s_id, function, line, inode->i_ino);
416         if (block)
417                 printk("block %llu: ", block);
418         printk("comm %s: ", current->comm);
419         vprintk(fmt, args);
420         printk("\n");
421         va_end(args);
422
423         ext4_handle_error(inode->i_sb);
424 }
425
426 void ext4_error_file(struct file *file, const char *function,
427                      unsigned int line, const char *fmt, ...)
428 {
429         va_list args;
430         struct ext4_super_block *es;
431         struct inode *inode = file->f_dentry->d_inode;
432         char pathname[80], *path;
433
434         es = EXT4_SB(inode->i_sb)->s_es;
435         es->s_last_error_ino = cpu_to_le32(inode->i_ino);
436         save_error_info(inode->i_sb, function, line);
437         va_start(args, fmt);
438         path = d_path(&(file->f_path), pathname, sizeof(pathname));
439         if (!path)
440                 path = "(unknown)";
441         printk(KERN_CRIT
442                "EXT4-fs error (device %s): %s:%d: inode #%lu "
443                "(comm %s path %s): ",
444                inode->i_sb->s_id, function, line, inode->i_ino,
445                current->comm, path);
446         vprintk(fmt, args);
447         printk("\n");
448         va_end(args);
449
450         ext4_handle_error(inode->i_sb);
451 }
452
453 static const char *ext4_decode_error(struct super_block *sb, int errno,
454                                      char nbuf[16])
455 {
456         char *errstr = NULL;
457
458         switch (errno) {
459         case -EIO:
460                 errstr = "IO failure";
461                 break;
462         case -ENOMEM:
463                 errstr = "Out of memory";
464                 break;
465         case -EROFS:
466                 if (!sb || (EXT4_SB(sb)->s_journal &&
467                             EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT))
468                         errstr = "Journal has aborted";
469                 else
470                         errstr = "Readonly filesystem";
471                 break;
472         default:
473                 /* If the caller passed in an extra buffer for unknown
474                  * errors, textualise them now.  Else we just return
475                  * NULL. */
476                 if (nbuf) {
477                         /* Check for truncated error codes... */
478                         if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
479                                 errstr = nbuf;
480                 }
481                 break;
482         }
483
484         return errstr;
485 }
486
487 /* __ext4_std_error decodes expected errors from journaling functions
488  * automatically and invokes the appropriate error response.  */
489
490 void __ext4_std_error(struct super_block *sb, const char *function,
491                       unsigned int line, int errno)
492 {
493         char nbuf[16];
494         const char *errstr;
495
496         /* Special case: if the error is EROFS, and we're not already
497          * inside a transaction, then there's really no point in logging
498          * an error. */
499         if (errno == -EROFS && journal_current_handle() == NULL &&
500             (sb->s_flags & MS_RDONLY))
501                 return;
502
503         errstr = ext4_decode_error(sb, errno, nbuf);
504         printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n",
505                sb->s_id, function, line, errstr);
506         save_error_info(sb, function, line);
507
508         ext4_handle_error(sb);
509 }
510
511 /*
512  * ext4_abort is a much stronger failure handler than ext4_error.  The
513  * abort function may be used to deal with unrecoverable failures such
514  * as journal IO errors or ENOMEM at a critical moment in log management.
515  *
516  * We unconditionally force the filesystem into an ABORT|READONLY state,
517  * unless the error response on the fs has been set to panic in which
518  * case we take the easy way out and panic immediately.
519  */
520
521 void __ext4_abort(struct super_block *sb, const char *function,
522                 unsigned int line, const char *fmt, ...)
523 {
524         va_list args;
525
526         save_error_info(sb, function, line);
527         va_start(args, fmt);
528         printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: ", sb->s_id,
529                function, line);
530         vprintk(fmt, args);
531         printk("\n");
532         va_end(args);
533
534         if ((sb->s_flags & MS_RDONLY) == 0) {
535                 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
536                 sb->s_flags |= MS_RDONLY;
537                 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
538                 if (EXT4_SB(sb)->s_journal)
539                         jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
540                 save_error_info(sb, function, line);
541         }
542         if (test_opt(sb, ERRORS_PANIC))
543                 panic("EXT4-fs panic from previous error\n");
544 }
545
546 void ext4_msg (struct super_block * sb, const char *prefix,
547                    const char *fmt, ...)
548 {
549         va_list args;
550
551         va_start(args, fmt);
552         printk("%sEXT4-fs (%s): ", prefix, sb->s_id);
553         vprintk(fmt, args);
554         printk("\n");
555         va_end(args);
556 }
557
558 void __ext4_warning(struct super_block *sb, const char *function,
559                     unsigned int line, const char *fmt, ...)
560 {
561         va_list args;
562
563         va_start(args, fmt);
564         printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: ",
565                sb->s_id, function, line);
566         vprintk(fmt, args);
567         printk("\n");
568         va_end(args);
569 }
570
571 void __ext4_grp_locked_error(const char *function, unsigned int line,
572                              struct super_block *sb, ext4_group_t grp,
573                              unsigned long ino, ext4_fsblk_t block,
574                              const char *fmt, ...)
575 __releases(bitlock)
576 __acquires(bitlock)
577 {
578         va_list args;
579         struct ext4_super_block *es = EXT4_SB(sb)->s_es;
580
581         es->s_last_error_ino = cpu_to_le32(ino);
582         es->s_last_error_block = cpu_to_le64(block);
583         __save_error_info(sb, function, line);
584         va_start(args, fmt);
585         printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u",
586                sb->s_id, function, line, grp);
587         if (ino)
588                 printk("inode %lu: ", ino);
589         if (block)
590                 printk("block %llu:", (unsigned long long) block);
591         vprintk(fmt, args);
592         printk("\n");
593         va_end(args);
594
595         if (test_opt(sb, ERRORS_CONT)) {
596                 ext4_commit_super(sb, 0);
597                 return;
598         }
599
600         ext4_unlock_group(sb, grp);
601         ext4_handle_error(sb);
602         /*
603          * We only get here in the ERRORS_RO case; relocking the group
604          * may be dangerous, but nothing bad will happen since the
605          * filesystem will have already been marked read/only and the
606          * journal has been aborted.  We return 1 as a hint to callers
607          * who might what to use the return value from
608          * ext4_grp_locked_error() to distinguish beween the
609          * ERRORS_CONT and ERRORS_RO case, and perhaps return more
610          * aggressively from the ext4 function in question, with a
611          * more appropriate error code.
612          */
613         ext4_lock_group(sb, grp);
614         return;
615 }
616
617 void ext4_update_dynamic_rev(struct super_block *sb)
618 {
619         struct ext4_super_block *es = EXT4_SB(sb)->s_es;
620
621         if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
622                 return;
623
624         ext4_warning(sb,
625                      "updating to rev %d because of new feature flag, "
626                      "running e2fsck is recommended",
627                      EXT4_DYNAMIC_REV);
628
629         es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
630         es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
631         es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
632         /* leave es->s_feature_*compat flags alone */
633         /* es->s_uuid will be set by e2fsck if empty */
634
635         /*
636          * The rest of the superblock fields should be zero, and if not it
637          * means they are likely already in use, so leave them alone.  We
638          * can leave it up to e2fsck to clean up any inconsistencies there.
639          */
640 }
641
642 /*
643  * Open the external journal device
644  */
645 static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb)
646 {
647         struct block_device *bdev;
648         char b[BDEVNAME_SIZE];
649
650         bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
651         if (IS_ERR(bdev))
652                 goto fail;
653         return bdev;
654
655 fail:
656         ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld",
657                         __bdevname(dev, b), PTR_ERR(bdev));
658         return NULL;
659 }
660
661 /*
662  * Release the journal device
663  */
664 static int ext4_blkdev_put(struct block_device *bdev)
665 {
666         bd_release(bdev);
667         return blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
668 }
669
670 static int ext4_blkdev_remove(struct ext4_sb_info *sbi)
671 {
672         struct block_device *bdev;
673         int ret = -ENODEV;
674
675         bdev = sbi->journal_bdev;
676         if (bdev) {
677                 ret = ext4_blkdev_put(bdev);
678                 sbi->journal_bdev = NULL;
679         }
680         return ret;
681 }
682
683 static inline struct inode *orphan_list_entry(struct list_head *l)
684 {
685         return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
686 }
687
688 static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
689 {
690         struct list_head *l;
691
692         ext4_msg(sb, KERN_ERR, "sb orphan head is %d",
693                  le32_to_cpu(sbi->s_es->s_last_orphan));
694
695         printk(KERN_ERR "sb_info orphan list:\n");
696         list_for_each(l, &sbi->s_orphan) {
697                 struct inode *inode = orphan_list_entry(l);
698                 printk(KERN_ERR "  "
699                        "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
700                        inode->i_sb->s_id, inode->i_ino, inode,
701                        inode->i_mode, inode->i_nlink,
702                        NEXT_ORPHAN(inode));
703         }
704 }
705
706 static void ext4_put_super(struct super_block *sb)
707 {
708         struct ext4_sb_info *sbi = EXT4_SB(sb);
709         struct ext4_super_block *es = sbi->s_es;
710         int i, err;
711
712         ext4_unregister_li_request(sb);
713         dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
714
715         flush_workqueue(sbi->dio_unwritten_wq);
716         destroy_workqueue(sbi->dio_unwritten_wq);
717
718         lock_super(sb);
719         if (sb->s_dirt)
720                 ext4_commit_super(sb, 1);
721
722         if (sbi->s_journal) {
723                 err = jbd2_journal_destroy(sbi->s_journal);
724                 sbi->s_journal = NULL;
725                 if (err < 0)
726                         ext4_abort(sb, "Couldn't clean up the journal");
727         }
728
729         del_timer(&sbi->s_err_report);
730         ext4_release_system_zone(sb);
731         ext4_mb_release(sb);
732         ext4_ext_release(sb);
733         ext4_xattr_put_super(sb);
734
735         if (!(sb->s_flags & MS_RDONLY)) {
736                 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
737                 es->s_state = cpu_to_le16(sbi->s_mount_state);
738                 ext4_commit_super(sb, 1);
739         }
740         if (sbi->s_proc) {
741                 remove_proc_entry(sb->s_id, ext4_proc_root);
742         }
743         kobject_del(&sbi->s_kobj);
744
745         for (i = 0; i < sbi->s_gdb_count; i++)
746                 brelse(sbi->s_group_desc[i]);
747         kfree(sbi->s_group_desc);
748         if (is_vmalloc_addr(sbi->s_flex_groups))
749                 vfree(sbi->s_flex_groups);
750         else
751                 kfree(sbi->s_flex_groups);
752         percpu_counter_destroy(&sbi->s_freeblocks_counter);
753         percpu_counter_destroy(&sbi->s_freeinodes_counter);
754         percpu_counter_destroy(&sbi->s_dirs_counter);
755         percpu_counter_destroy(&sbi->s_dirtyblocks_counter);
756         brelse(sbi->s_sbh);
757 #ifdef CONFIG_QUOTA
758         for (i = 0; i < MAXQUOTAS; i++)
759                 kfree(sbi->s_qf_names[i]);
760 #endif
761
762         /* Debugging code just in case the in-memory inode orphan list
763          * isn't empty.  The on-disk one can be non-empty if we've
764          * detected an error and taken the fs readonly, but the
765          * in-memory list had better be clean by this point. */
766         if (!list_empty(&sbi->s_orphan))
767                 dump_orphan_list(sb, sbi);
768         J_ASSERT(list_empty(&sbi->s_orphan));
769
770         invalidate_bdev(sb->s_bdev);
771         if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
772                 /*
773                  * Invalidate the journal device's buffers.  We don't want them
774                  * floating about in memory - the physical journal device may
775                  * hotswapped, and it breaks the `ro-after' testing code.
776                  */
777                 sync_blockdev(sbi->journal_bdev);
778                 invalidate_bdev(sbi->journal_bdev);
779                 ext4_blkdev_remove(sbi);
780         }
781         sb->s_fs_info = NULL;
782         /*
783          * Now that we are completely done shutting down the
784          * superblock, we need to actually destroy the kobject.
785          */
786         unlock_super(sb);
787         kobject_put(&sbi->s_kobj);
788         wait_for_completion(&sbi->s_kobj_unregister);
789         kfree(sbi->s_blockgroup_lock);
790         kfree(sbi);
791 }
792
793 static struct kmem_cache *ext4_inode_cachep;
794
795 /*
796  * Called inside transaction, so use GFP_NOFS
797  */
798 static struct inode *ext4_alloc_inode(struct super_block *sb)
799 {
800         struct ext4_inode_info *ei;
801
802         ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
803         if (!ei)
804                 return NULL;
805
806         ei->vfs_inode.i_version = 1;
807         ei->vfs_inode.i_data.writeback_index = 0;
808         memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache));
809         INIT_LIST_HEAD(&ei->i_prealloc_list);
810         spin_lock_init(&ei->i_prealloc_lock);
811         /*
812          * Note:  We can be called before EXT4_SB(sb)->s_journal is set,
813          * therefore it can be null here.  Don't check it, just initialize
814          * jinode.
815          */
816         jbd2_journal_init_jbd_inode(&ei->jinode, &ei->vfs_inode);
817         ei->i_reserved_data_blocks = 0;
818         ei->i_reserved_meta_blocks = 0;
819         ei->i_allocated_meta_blocks = 0;
820         ei->i_da_metadata_calc_len = 0;
821         ei->i_delalloc_reserved_flag = 0;
822         spin_lock_init(&(ei->i_block_reservation_lock));
823 #ifdef CONFIG_QUOTA
824         ei->i_reserved_quota = 0;
825 #endif
826         INIT_LIST_HEAD(&ei->i_completed_io_list);
827         spin_lock_init(&ei->i_completed_io_lock);
828         ei->cur_aio_dio = NULL;
829         ei->i_sync_tid = 0;
830         ei->i_datasync_tid = 0;
831         atomic_set(&ei->i_ioend_count, 0);
832
833         return &ei->vfs_inode;
834 }
835
836 static int ext4_drop_inode(struct inode *inode)
837 {
838         int drop = generic_drop_inode(inode);
839
840         trace_ext4_drop_inode(inode, drop);
841         return drop;
842 }
843
844 static void ext4_i_callback(struct rcu_head *head)
845 {
846         struct inode *inode = container_of(head, struct inode, i_rcu);
847         INIT_LIST_HEAD(&inode->i_dentry);
848         kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
849 }
850
851 static void ext4_destroy_inode(struct inode *inode)
852 {
853         ext4_ioend_wait(inode);
854         if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
855                 ext4_msg(inode->i_sb, KERN_ERR,
856                          "Inode %lu (%p): orphan list check failed!",
857                          inode->i_ino, EXT4_I(inode));
858                 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
859                                 EXT4_I(inode), sizeof(struct ext4_inode_info),
860                                 true);
861                 dump_stack();
862         }
863         call_rcu(&inode->i_rcu, ext4_i_callback);
864 }
865
866 static void init_once(void *foo)
867 {
868         struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
869
870         INIT_LIST_HEAD(&ei->i_orphan);
871 #ifdef CONFIG_EXT4_FS_XATTR
872         init_rwsem(&ei->xattr_sem);
873 #endif
874         init_rwsem(&ei->i_data_sem);
875         inode_init_once(&ei->vfs_inode);
876 }
877
878 static int init_inodecache(void)
879 {
880         ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
881                                              sizeof(struct ext4_inode_info),
882                                              0, (SLAB_RECLAIM_ACCOUNT|
883                                                 SLAB_MEM_SPREAD),
884                                              init_once);
885         if (ext4_inode_cachep == NULL)
886                 return -ENOMEM;
887         return 0;
888 }
889
890 static void destroy_inodecache(void)
891 {
892         kmem_cache_destroy(ext4_inode_cachep);
893 }
894
895 void ext4_clear_inode(struct inode *inode)
896 {
897         invalidate_inode_buffers(inode);
898         end_writeback(inode);
899         dquot_drop(inode);
900         ext4_discard_preallocations(inode);
901         if (EXT4_JOURNAL(inode))
902                 jbd2_journal_release_jbd_inode(EXT4_SB(inode->i_sb)->s_journal,
903                                        &EXT4_I(inode)->jinode);
904 }
905
906 static inline void ext4_show_quota_options(struct seq_file *seq,
907                                            struct super_block *sb)
908 {
909 #if defined(CONFIG_QUOTA)
910         struct ext4_sb_info *sbi = EXT4_SB(sb);
911
912         if (sbi->s_jquota_fmt) {
913                 char *fmtname = "";
914
915                 switch (sbi->s_jquota_fmt) {
916                 case QFMT_VFS_OLD:
917                         fmtname = "vfsold";
918                         break;
919                 case QFMT_VFS_V0:
920                         fmtname = "vfsv0";
921                         break;
922                 case QFMT_VFS_V1:
923                         fmtname = "vfsv1";
924                         break;
925                 }
926                 seq_printf(seq, ",jqfmt=%s", fmtname);
927         }
928
929         if (sbi->s_qf_names[USRQUOTA])
930                 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
931
932         if (sbi->s_qf_names[GRPQUOTA])
933                 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
934
935         if (test_opt(sb, USRQUOTA))
936                 seq_puts(seq, ",usrquota");
937
938         if (test_opt(sb, GRPQUOTA))
939                 seq_puts(seq, ",grpquota");
940 #endif
941 }
942
943 /*
944  * Show an option if
945  *  - it's set to a non-default value OR
946  *  - if the per-sb default is different from the global default
947  */
948 static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs)
949 {
950         int def_errors;
951         unsigned long def_mount_opts;
952         struct super_block *sb = vfs->mnt_sb;
953         struct ext4_sb_info *sbi = EXT4_SB(sb);
954         struct ext4_super_block *es = sbi->s_es;
955
956         def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
957         def_errors     = le16_to_cpu(es->s_errors);
958
959         if (sbi->s_sb_block != 1)
960                 seq_printf(seq, ",sb=%llu", sbi->s_sb_block);
961         if (test_opt(sb, MINIX_DF))
962                 seq_puts(seq, ",minixdf");
963         if (test_opt(sb, GRPID) && !(def_mount_opts & EXT4_DEFM_BSDGROUPS))
964                 seq_puts(seq, ",grpid");
965         if (!test_opt(sb, GRPID) && (def_mount_opts & EXT4_DEFM_BSDGROUPS))
966                 seq_puts(seq, ",nogrpid");
967         if (sbi->s_resuid != EXT4_DEF_RESUID ||
968             le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID) {
969                 seq_printf(seq, ",resuid=%u", sbi->s_resuid);
970         }
971         if (sbi->s_resgid != EXT4_DEF_RESGID ||
972             le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID) {
973                 seq_printf(seq, ",resgid=%u", sbi->s_resgid);
974         }
975         if (test_opt(sb, ERRORS_RO)) {
976                 if (def_errors == EXT4_ERRORS_PANIC ||
977                     def_errors == EXT4_ERRORS_CONTINUE) {
978                         seq_puts(seq, ",errors=remount-ro");
979                 }
980         }
981         if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
982                 seq_puts(seq, ",errors=continue");
983         if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
984                 seq_puts(seq, ",errors=panic");
985         if (test_opt(sb, NO_UID32) && !(def_mount_opts & EXT4_DEFM_UID16))
986                 seq_puts(seq, ",nouid32");
987         if (test_opt(sb, DEBUG) && !(def_mount_opts & EXT4_DEFM_DEBUG))
988                 seq_puts(seq, ",debug");
989         if (test_opt(sb, OLDALLOC))
990                 seq_puts(seq, ",oldalloc");
991 #ifdef CONFIG_EXT4_FS_XATTR
992         if (test_opt(sb, XATTR_USER) &&
993                 !(def_mount_opts & EXT4_DEFM_XATTR_USER))
994                 seq_puts(seq, ",user_xattr");
995         if (!test_opt(sb, XATTR_USER) &&
996             (def_mount_opts & EXT4_DEFM_XATTR_USER)) {
997                 seq_puts(seq, ",nouser_xattr");
998         }
999 #endif
1000 #ifdef CONFIG_EXT4_FS_POSIX_ACL
1001         if (test_opt(sb, POSIX_ACL) && !(def_mount_opts & EXT4_DEFM_ACL))
1002                 seq_puts(seq, ",acl");
1003         if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT4_DEFM_ACL))
1004                 seq_puts(seq, ",noacl");
1005 #endif
1006         if (sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) {
1007                 seq_printf(seq, ",commit=%u",
1008                            (unsigned) (sbi->s_commit_interval / HZ));
1009         }
1010         if (sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME) {
1011                 seq_printf(seq, ",min_batch_time=%u",
1012                            (unsigned) sbi->s_min_batch_time);
1013         }
1014         if (sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME) {
1015                 seq_printf(seq, ",max_batch_time=%u",
1016                            (unsigned) sbi->s_min_batch_time);
1017         }
1018
1019         /*
1020          * We're changing the default of barrier mount option, so
1021          * let's always display its mount state so it's clear what its
1022          * status is.
1023          */
1024         seq_puts(seq, ",barrier=");
1025         seq_puts(seq, test_opt(sb, BARRIER) ? "1" : "0");
1026         if (test_opt(sb, JOURNAL_ASYNC_COMMIT))
1027                 seq_puts(seq, ",journal_async_commit");
1028         else if (test_opt(sb, JOURNAL_CHECKSUM))
1029                 seq_puts(seq, ",journal_checksum");
1030         if (test_opt(sb, I_VERSION))
1031                 seq_puts(seq, ",i_version");
1032         if (!test_opt(sb, DELALLOC) &&
1033             !(def_mount_opts & EXT4_DEFM_NODELALLOC))
1034                 seq_puts(seq, ",nodelalloc");
1035
1036         if (test_opt(sb, MBLK_IO_SUBMIT))
1037                 seq_puts(seq, ",mblk_io_submit");
1038         if (sbi->s_stripe)
1039                 seq_printf(seq, ",stripe=%lu", sbi->s_stripe);
1040         /*
1041          * journal mode get enabled in different ways
1042          * So just print the value even if we didn't specify it
1043          */
1044         if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
1045                 seq_puts(seq, ",data=journal");
1046         else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
1047                 seq_puts(seq, ",data=ordered");
1048         else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
1049                 seq_puts(seq, ",data=writeback");
1050
1051         if (sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
1052                 seq_printf(seq, ",inode_readahead_blks=%u",
1053                            sbi->s_inode_readahead_blks);
1054
1055         if (test_opt(sb, DATA_ERR_ABORT))
1056                 seq_puts(seq, ",data_err=abort");
1057
1058         if (test_opt(sb, NO_AUTO_DA_ALLOC))
1059                 seq_puts(seq, ",noauto_da_alloc");
1060
1061         if (test_opt(sb, DISCARD) && !(def_mount_opts & EXT4_DEFM_DISCARD))
1062                 seq_puts(seq, ",discard");
1063
1064         if (test_opt(sb, NOLOAD))
1065                 seq_puts(seq, ",norecovery");
1066
1067         if (test_opt(sb, DIOREAD_NOLOCK))
1068                 seq_puts(seq, ",dioread_nolock");
1069
1070         if (test_opt(sb, BLOCK_VALIDITY) &&
1071             !(def_mount_opts & EXT4_DEFM_BLOCK_VALIDITY))
1072                 seq_puts(seq, ",block_validity");
1073
1074         if (!test_opt(sb, INIT_INODE_TABLE))
1075                 seq_puts(seq, ",noinit_inode_table");
1076         else if (sbi->s_li_wait_mult)
1077                 seq_printf(seq, ",init_inode_table=%u",
1078                            (unsigned) sbi->s_li_wait_mult);
1079
1080         ext4_show_quota_options(seq, sb);
1081
1082         return 0;
1083 }
1084
1085 static struct inode *ext4_nfs_get_inode(struct super_block *sb,
1086                                         u64 ino, u32 generation)
1087 {
1088         struct inode *inode;
1089
1090         if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
1091                 return ERR_PTR(-ESTALE);
1092         if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
1093                 return ERR_PTR(-ESTALE);
1094
1095         /* iget isn't really right if the inode is currently unallocated!!
1096          *
1097          * ext4_read_inode will return a bad_inode if the inode had been
1098          * deleted, so we should be safe.
1099          *
1100          * Currently we don't know the generation for parent directory, so
1101          * a generation of 0 means "accept any"
1102          */
1103         inode = ext4_iget(sb, ino);
1104         if (IS_ERR(inode))
1105                 return ERR_CAST(inode);
1106         if (generation && inode->i_generation != generation) {
1107                 iput(inode);
1108                 return ERR_PTR(-ESTALE);
1109         }
1110
1111         return inode;
1112 }
1113
1114 static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
1115                                         int fh_len, int fh_type)
1116 {
1117         return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
1118                                     ext4_nfs_get_inode);
1119 }
1120
1121 static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
1122                                         int fh_len, int fh_type)
1123 {
1124         return generic_fh_to_parent(sb, fid, fh_len, fh_type,
1125                                     ext4_nfs_get_inode);
1126 }
1127
1128 /*
1129  * Try to release metadata pages (indirect blocks, directories) which are
1130  * mapped via the block device.  Since these pages could have journal heads
1131  * which would prevent try_to_free_buffers() from freeing them, we must use
1132  * jbd2 layer's try_to_free_buffers() function to release them.
1133  */
1134 static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
1135                                  gfp_t wait)
1136 {
1137         journal_t *journal = EXT4_SB(sb)->s_journal;
1138
1139         WARN_ON(PageChecked(page));
1140         if (!page_has_buffers(page))
1141                 return 0;
1142         if (journal)
1143                 return jbd2_journal_try_to_free_buffers(journal, page,
1144                                                         wait & ~__GFP_WAIT);
1145         return try_to_free_buffers(page);
1146 }
1147
1148 #ifdef CONFIG_QUOTA
1149 #define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
1150 #define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
1151
1152 static int ext4_write_dquot(struct dquot *dquot);
1153 static int ext4_acquire_dquot(struct dquot *dquot);
1154 static int ext4_release_dquot(struct dquot *dquot);
1155 static int ext4_mark_dquot_dirty(struct dquot *dquot);
1156 static int ext4_write_info(struct super_block *sb, int type);
1157 static int ext4_quota_on(struct super_block *sb, int type, int format_id,
1158                                 char *path);
1159 static int ext4_quota_off(struct super_block *sb, int type);
1160 static int ext4_quota_on_mount(struct super_block *sb, int type);
1161 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
1162                                size_t len, loff_t off);
1163 static ssize_t ext4_quota_write(struct super_block *sb, int type,
1164                                 const char *data, size_t len, loff_t off);
1165
1166 static const struct dquot_operations ext4_quota_operations = {
1167 #ifdef CONFIG_QUOTA
1168         .get_reserved_space = ext4_get_reserved_space,
1169 #endif
1170         .write_dquot    = ext4_write_dquot,
1171         .acquire_dquot  = ext4_acquire_dquot,
1172         .release_dquot  = ext4_release_dquot,
1173         .mark_dirty     = ext4_mark_dquot_dirty,
1174         .write_info     = ext4_write_info,
1175         .alloc_dquot    = dquot_alloc,
1176         .destroy_dquot  = dquot_destroy,
1177 };
1178
1179 static const struct quotactl_ops ext4_qctl_operations = {
1180         .quota_on       = ext4_quota_on,
1181         .quota_off      = ext4_quota_off,
1182         .quota_sync     = dquot_quota_sync,
1183         .get_info       = dquot_get_dqinfo,
1184         .set_info       = dquot_set_dqinfo,
1185         .get_dqblk      = dquot_get_dqblk,
1186         .set_dqblk      = dquot_set_dqblk
1187 };
1188 #endif
1189
1190 static const struct super_operations ext4_sops = {
1191         .alloc_inode    = ext4_alloc_inode,
1192         .destroy_inode  = ext4_destroy_inode,
1193         .write_inode    = ext4_write_inode,
1194         .dirty_inode    = ext4_dirty_inode,
1195         .drop_inode     = ext4_drop_inode,
1196         .evict_inode    = ext4_evict_inode,
1197         .put_super      = ext4_put_super,
1198         .sync_fs        = ext4_sync_fs,
1199         .freeze_fs      = ext4_freeze,
1200         .unfreeze_fs    = ext4_unfreeze,
1201         .statfs         = ext4_statfs,
1202         .remount_fs     = ext4_remount,
1203         .show_options   = ext4_show_options,
1204 #ifdef CONFIG_QUOTA
1205         .quota_read     = ext4_quota_read,
1206         .quota_write    = ext4_quota_write,
1207 #endif
1208         .bdev_try_to_free_page = bdev_try_to_free_page,
1209 };
1210
1211 static const struct super_operations ext4_nojournal_sops = {
1212         .alloc_inode    = ext4_alloc_inode,
1213         .destroy_inode  = ext4_destroy_inode,
1214         .write_inode    = ext4_write_inode,
1215         .dirty_inode    = ext4_dirty_inode,
1216         .drop_inode     = ext4_drop_inode,
1217         .evict_inode    = ext4_evict_inode,
1218         .write_super    = ext4_write_super,
1219         .put_super      = ext4_put_super,
1220         .statfs         = ext4_statfs,
1221         .remount_fs     = ext4_remount,
1222         .show_options   = ext4_show_options,
1223 #ifdef CONFIG_QUOTA
1224         .quota_read     = ext4_quota_read,
1225         .quota_write    = ext4_quota_write,
1226 #endif
1227         .bdev_try_to_free_page = bdev_try_to_free_page,
1228 };
1229
1230 static const struct export_operations ext4_export_ops = {
1231         .fh_to_dentry = ext4_fh_to_dentry,
1232         .fh_to_parent = ext4_fh_to_parent,
1233         .get_parent = ext4_get_parent,
1234 };
1235
1236 enum {
1237         Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
1238         Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
1239         Opt_nouid32, Opt_debug, Opt_oldalloc, Opt_orlov,
1240         Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
1241         Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload, Opt_nobh, Opt_bh,
1242         Opt_commit, Opt_min_batch_time, Opt_max_batch_time,
1243         Opt_journal_update, Opt_journal_dev,
1244         Opt_journal_checksum, Opt_journal_async_commit,
1245         Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
1246         Opt_data_err_abort, Opt_data_err_ignore,
1247         Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
1248         Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
1249         Opt_noquota, Opt_ignore, Opt_barrier, Opt_nobarrier, Opt_err,
1250         Opt_resize, Opt_usrquota, Opt_grpquota, Opt_i_version,
1251         Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_mblk_io_submit,
1252         Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity,
1253         Opt_inode_readahead_blks, Opt_journal_ioprio,
1254         Opt_dioread_nolock, Opt_dioread_lock,
1255         Opt_discard, Opt_nodiscard,
1256         Opt_init_inode_table, Opt_noinit_inode_table,
1257 };
1258
1259 static const match_table_t tokens = {
1260         {Opt_bsd_df, "bsddf"},
1261         {Opt_minix_df, "minixdf"},
1262         {Opt_grpid, "grpid"},
1263         {Opt_grpid, "bsdgroups"},
1264         {Opt_nogrpid, "nogrpid"},
1265         {Opt_nogrpid, "sysvgroups"},
1266         {Opt_resgid, "resgid=%u"},
1267         {Opt_resuid, "resuid=%u"},
1268         {Opt_sb, "sb=%u"},
1269         {Opt_err_cont, "errors=continue"},
1270         {Opt_err_panic, "errors=panic"},
1271         {Opt_err_ro, "errors=remount-ro"},
1272         {Opt_nouid32, "nouid32"},
1273         {Opt_debug, "debug"},
1274         {Opt_oldalloc, "oldalloc"},
1275         {Opt_orlov, "orlov"},
1276         {Opt_user_xattr, "user_xattr"},
1277         {Opt_nouser_xattr, "nouser_xattr"},
1278         {Opt_acl, "acl"},
1279         {Opt_noacl, "noacl"},
1280         {Opt_noload, "noload"},
1281         {Opt_noload, "norecovery"},
1282         {Opt_nobh, "nobh"},
1283         {Opt_bh, "bh"},
1284         {Opt_commit, "commit=%u"},
1285         {Opt_min_batch_time, "min_batch_time=%u"},
1286         {Opt_max_batch_time, "max_batch_time=%u"},
1287         {Opt_journal_update, "journal=update"},
1288         {Opt_journal_dev, "journal_dev=%u"},
1289         {Opt_journal_checksum, "journal_checksum"},
1290         {Opt_journal_async_commit, "journal_async_commit"},
1291         {Opt_abort, "abort"},
1292         {Opt_data_journal, "data=journal"},
1293         {Opt_data_ordered, "data=ordered"},
1294         {Opt_data_writeback, "data=writeback"},
1295         {Opt_data_err_abort, "data_err=abort"},
1296         {Opt_data_err_ignore, "data_err=ignore"},
1297         {Opt_offusrjquota, "usrjquota="},
1298         {Opt_usrjquota, "usrjquota=%s"},
1299         {Opt_offgrpjquota, "grpjquota="},
1300         {Opt_grpjquota, "grpjquota=%s"},
1301         {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
1302         {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
1303         {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
1304         {Opt_grpquota, "grpquota"},
1305         {Opt_noquota, "noquota"},
1306         {Opt_quota, "quota"},
1307         {Opt_usrquota, "usrquota"},
1308         {Opt_barrier, "barrier=%u"},
1309         {Opt_barrier, "barrier"},
1310         {Opt_nobarrier, "nobarrier"},
1311         {Opt_i_version, "i_version"},
1312         {Opt_stripe, "stripe=%u"},
1313         {Opt_resize, "resize"},
1314         {Opt_delalloc, "delalloc"},
1315         {Opt_nodelalloc, "nodelalloc"},
1316         {Opt_mblk_io_submit, "mblk_io_submit"},
1317         {Opt_nomblk_io_submit, "nomblk_io_submit"},
1318         {Opt_block_validity, "block_validity"},
1319         {Opt_noblock_validity, "noblock_validity"},
1320         {Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
1321         {Opt_journal_ioprio, "journal_ioprio=%u"},
1322         {Opt_auto_da_alloc, "auto_da_alloc=%u"},
1323         {Opt_auto_da_alloc, "auto_da_alloc"},
1324         {Opt_noauto_da_alloc, "noauto_da_alloc"},
1325         {Opt_dioread_nolock, "dioread_nolock"},
1326         {Opt_dioread_lock, "dioread_lock"},
1327         {Opt_discard, "discard"},
1328         {Opt_nodiscard, "nodiscard"},
1329         {Opt_init_inode_table, "init_itable=%u"},
1330         {Opt_init_inode_table, "init_itable"},
1331         {Opt_noinit_inode_table, "noinit_itable"},
1332         {Opt_err, NULL},
1333 };
1334
1335 static ext4_fsblk_t get_sb_block(void **data)
1336 {
1337         ext4_fsblk_t    sb_block;
1338         char            *options = (char *) *data;
1339
1340         if (!options || strncmp(options, "sb=", 3) != 0)
1341                 return 1;       /* Default location */
1342
1343         options += 3;
1344         /* TODO: use simple_strtoll with >32bit ext4 */
1345         sb_block = simple_strtoul(options, &options, 0);
1346         if (*options && *options != ',') {
1347                 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
1348                        (char *) *data);
1349                 return 1;
1350         }
1351         if (*options == ',')
1352                 options++;
1353         *data = (void *) options;
1354
1355         return sb_block;
1356 }
1357
1358 #define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
1359 static char deprecated_msg[] = "Mount option \"%s\" will be removed by %s\n"
1360         "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
1361
1362 #ifdef CONFIG_QUOTA
1363 static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
1364 {
1365         struct ext4_sb_info *sbi = EXT4_SB(sb);
1366         char *qname;
1367
1368         if (sb_any_quota_loaded(sb) &&
1369                 !sbi->s_qf_names[qtype]) {
1370                 ext4_msg(sb, KERN_ERR,
1371                         "Cannot change journaled "
1372                         "quota options when quota turned on");
1373                 return 0;
1374         }
1375         qname = match_strdup(args);
1376         if (!qname) {
1377                 ext4_msg(sb, KERN_ERR,
1378                         "Not enough memory for storing quotafile name");
1379                 return 0;
1380         }
1381         if (sbi->s_qf_names[qtype] &&
1382                 strcmp(sbi->s_qf_names[qtype], qname)) {
1383                 ext4_msg(sb, KERN_ERR,
1384                         "%s quota file already specified", QTYPE2NAME(qtype));
1385                 kfree(qname);
1386                 return 0;
1387         }
1388         sbi->s_qf_names[qtype] = qname;
1389         if (strchr(sbi->s_qf_names[qtype], '/')) {
1390                 ext4_msg(sb, KERN_ERR,
1391                         "quotafile must be on filesystem root");
1392                 kfree(sbi->s_qf_names[qtype]);
1393                 sbi->s_qf_names[qtype] = NULL;
1394                 return 0;
1395         }
1396         set_opt(sbi->s_mount_opt, QUOTA);
1397         return 1;
1398 }
1399
1400 static int clear_qf_name(struct super_block *sb, int qtype)
1401 {
1402
1403         struct ext4_sb_info *sbi = EXT4_SB(sb);
1404
1405         if (sb_any_quota_loaded(sb) &&
1406                 sbi->s_qf_names[qtype]) {
1407                 ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options"
1408                         " when quota turned on");
1409                 return 0;
1410         }
1411         /*
1412          * The space will be released later when all options are confirmed
1413          * to be correct
1414          */
1415         sbi->s_qf_names[qtype] = NULL;
1416         return 1;
1417 }
1418 #endif
1419
1420 static int parse_options(char *options, struct super_block *sb,
1421                          unsigned long *journal_devnum,
1422                          unsigned int *journal_ioprio,
1423                          ext4_fsblk_t *n_blocks_count, int is_remount)
1424 {
1425         struct ext4_sb_info *sbi = EXT4_SB(sb);
1426         char *p;
1427         substring_t args[MAX_OPT_ARGS];
1428         int data_opt = 0;
1429         int option;
1430 #ifdef CONFIG_QUOTA
1431         int qfmt;
1432 #endif
1433
1434         if (!options)
1435                 return 1;
1436
1437         while ((p = strsep(&options, ",")) != NULL) {
1438                 int token;
1439                 if (!*p)
1440                         continue;
1441
1442                 /*
1443                  * Initialize args struct so we know whether arg was
1444                  * found; some options take optional arguments.
1445                  */
1446                 args[0].to = args[0].from = 0;
1447                 token = match_token(p, tokens, args);
1448                 switch (token) {
1449                 case Opt_bsd_df:
1450                         ext4_msg(sb, KERN_WARNING, deprecated_msg, p, "2.6.38");
1451                         clear_opt(sbi->s_mount_opt, MINIX_DF);
1452                         break;
1453                 case Opt_minix_df:
1454                         ext4_msg(sb, KERN_WARNING, deprecated_msg, p, "2.6.38");
1455                         set_opt(sbi->s_mount_opt, MINIX_DF);
1456
1457                         break;
1458                 case Opt_grpid:
1459                         ext4_msg(sb, KERN_WARNING, deprecated_msg, p, "2.6.38");
1460                         set_opt(sbi->s_mount_opt, GRPID);
1461
1462                         break;
1463                 case Opt_nogrpid:
1464                         ext4_msg(sb, KERN_WARNING, deprecated_msg, p, "2.6.38");
1465                         clear_opt(sbi->s_mount_opt, GRPID);
1466
1467                         break;
1468                 case Opt_resuid:
1469                         if (match_int(&args[0], &option))
1470                                 return 0;
1471                         sbi->s_resuid = option;
1472                         break;
1473                 case Opt_resgid:
1474                         if (match_int(&args[0], &option))
1475                                 return 0;
1476                         sbi->s_resgid = option;
1477                         break;
1478                 case Opt_sb:
1479                         /* handled by get_sb_block() instead of here */
1480                         /* *sb_block = match_int(&args[0]); */
1481                         break;
1482                 case Opt_err_panic:
1483                         clear_opt(sbi->s_mount_opt, ERRORS_CONT);
1484                         clear_opt(sbi->s_mount_opt, ERRORS_RO);
1485                         set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1486                         break;
1487                 case Opt_err_ro:
1488                         clear_opt(sbi->s_mount_opt, ERRORS_CONT);
1489                         clear_opt(sbi->s_mount_opt, ERRORS_PANIC);
1490                         set_opt(sbi->s_mount_opt, ERRORS_RO);
1491                         break;
1492                 case Opt_err_cont:
1493                         clear_opt(sbi->s_mount_opt, ERRORS_RO);
1494                         clear_opt(sbi->s_mount_opt, ERRORS_PANIC);
1495                         set_opt(sbi->s_mount_opt, ERRORS_CONT);
1496                         break;
1497                 case Opt_nouid32:
1498                         set_opt(sbi->s_mount_opt, NO_UID32);
1499                         break;
1500                 case Opt_debug:
1501                         set_opt(sbi->s_mount_opt, DEBUG);
1502                         break;
1503                 case Opt_oldalloc:
1504                         set_opt(sbi->s_mount_opt, OLDALLOC);
1505                         break;
1506                 case Opt_orlov:
1507                         clear_opt(sbi->s_mount_opt, OLDALLOC);
1508                         break;
1509 #ifdef CONFIG_EXT4_FS_XATTR
1510                 case Opt_user_xattr:
1511                         set_opt(sbi->s_mount_opt, XATTR_USER);
1512                         break;
1513                 case Opt_nouser_xattr:
1514                         clear_opt(sbi->s_mount_opt, XATTR_USER);
1515                         break;
1516 #else
1517                 case Opt_user_xattr:
1518                 case Opt_nouser_xattr:
1519                         ext4_msg(sb, KERN_ERR, "(no)user_xattr options not supported");
1520                         break;
1521 #endif
1522 #ifdef CONFIG_EXT4_FS_POSIX_ACL
1523                 case Opt_acl:
1524                         set_opt(sbi->s_mount_opt, POSIX_ACL);
1525                         break;
1526                 case Opt_noacl:
1527                         clear_opt(sbi->s_mount_opt, POSIX_ACL);
1528                         break;
1529 #else
1530                 case Opt_acl:
1531                 case Opt_noacl:
1532                         ext4_msg(sb, KERN_ERR, "(no)acl options not supported");
1533                         break;
1534 #endif
1535                 case Opt_journal_update:
1536                         /* @@@ FIXME */
1537                         /* Eventually we will want to be able to create
1538                            a journal file here.  For now, only allow the
1539                            user to specify an existing inode to be the
1540                            journal file. */
1541                         if (is_remount) {
1542                                 ext4_msg(sb, KERN_ERR,
1543                                          "Cannot specify journal on remount");
1544                                 return 0;
1545                         }
1546                         set_opt(sbi->s_mount_opt, UPDATE_JOURNAL);
1547                         break;
1548                 case Opt_journal_dev:
1549                         if (is_remount) {
1550                                 ext4_msg(sb, KERN_ERR,
1551                                         "Cannot specify journal on remount");
1552                                 return 0;
1553                         }
1554                         if (match_int(&args[0], &option))
1555                                 return 0;
1556                         *journal_devnum = option;
1557                         break;
1558                 case Opt_journal_checksum:
1559                         set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM);
1560                         break;
1561                 case Opt_journal_async_commit:
1562                         set_opt(sbi->s_mount_opt, JOURNAL_ASYNC_COMMIT);
1563                         set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM);
1564                         break;
1565                 case Opt_noload:
1566                         set_opt(sbi->s_mount_opt, NOLOAD);
1567                         break;
1568                 case Opt_commit:
1569                         if (match_int(&args[0], &option))
1570                                 return 0;
1571                         if (option < 0)
1572                                 return 0;
1573                         if (option == 0)
1574                                 option = JBD2_DEFAULT_MAX_COMMIT_AGE;
1575                         sbi->s_commit_interval = HZ * option;
1576                         break;
1577                 case Opt_max_batch_time:
1578                         if (match_int(&args[0], &option))
1579                                 return 0;
1580                         if (option < 0)
1581                                 return 0;
1582                         if (option == 0)
1583                                 option = EXT4_DEF_MAX_BATCH_TIME;
1584                         sbi->s_max_batch_time = option;
1585                         break;
1586                 case Opt_min_batch_time:
1587                         if (match_int(&args[0], &option))
1588                                 return 0;
1589                         if (option < 0)
1590                                 return 0;
1591                         sbi->s_min_batch_time = option;
1592                         break;
1593                 case Opt_data_journal:
1594                         data_opt = EXT4_MOUNT_JOURNAL_DATA;
1595                         goto datacheck;
1596                 case Opt_data_ordered:
1597                         data_opt = EXT4_MOUNT_ORDERED_DATA;
1598                         goto datacheck;
1599                 case Opt_data_writeback:
1600                         data_opt = EXT4_MOUNT_WRITEBACK_DATA;
1601                 datacheck:
1602                         if (is_remount) {
1603                                 if (test_opt(sb, DATA_FLAGS) != data_opt) {
1604                                         ext4_msg(sb, KERN_ERR,
1605                                                 "Cannot change data mode on remount");
1606                                         return 0;
1607                                 }
1608                         } else {
1609                                 clear_opt(sbi->s_mount_opt, DATA_FLAGS);
1610                                 sbi->s_mount_opt |= data_opt;
1611                         }
1612                         break;
1613                 case Opt_data_err_abort:
1614                         set_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1615                         break;
1616                 case Opt_data_err_ignore:
1617                         clear_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1618                         break;
1619 #ifdef CONFIG_QUOTA
1620                 case Opt_usrjquota:
1621                         if (!set_qf_name(sb, USRQUOTA, &args[0]))
1622                                 return 0;
1623                         break;
1624                 case Opt_grpjquota:
1625                         if (!set_qf_name(sb, GRPQUOTA, &args[0]))
1626                                 return 0;
1627                         break;
1628                 case Opt_offusrjquota:
1629                         if (!clear_qf_name(sb, USRQUOTA))
1630                                 return 0;
1631                         break;
1632                 case Opt_offgrpjquota:
1633                         if (!clear_qf_name(sb, GRPQUOTA))
1634                                 return 0;
1635                         break;
1636
1637                 case Opt_jqfmt_vfsold:
1638                         qfmt = QFMT_VFS_OLD;
1639                         goto set_qf_format;
1640                 case Opt_jqfmt_vfsv0:
1641                         qfmt = QFMT_VFS_V0;
1642                         goto set_qf_format;
1643                 case Opt_jqfmt_vfsv1:
1644                         qfmt = QFMT_VFS_V1;
1645 set_qf_format:
1646                         if (sb_any_quota_loaded(sb) &&
1647                             sbi->s_jquota_fmt != qfmt) {
1648                                 ext4_msg(sb, KERN_ERR, "Cannot change "
1649                                         "journaled quota options when "
1650                                         "quota turned on");
1651                                 return 0;
1652                         }
1653                         sbi->s_jquota_fmt = qfmt;
1654                         break;
1655                 case Opt_quota:
1656                 case Opt_usrquota:
1657                         set_opt(sbi->s_mount_opt, QUOTA);
1658                         set_opt(sbi->s_mount_opt, USRQUOTA);
1659                         break;
1660                 case Opt_grpquota:
1661                         set_opt(sbi->s_mount_opt, QUOTA);
1662                         set_opt(sbi->s_mount_opt, GRPQUOTA);
1663                         break;
1664                 case Opt_noquota:
1665                         if (sb_any_quota_loaded(sb)) {
1666                                 ext4_msg(sb, KERN_ERR, "Cannot change quota "
1667                                         "options when quota turned on");
1668                                 return 0;
1669                         }
1670                         clear_opt(sbi->s_mount_opt, QUOTA);
1671                         clear_opt(sbi->s_mount_opt, USRQUOTA);
1672                         clear_opt(sbi->s_mount_opt, GRPQUOTA);
1673                         break;
1674 #else
1675                 case Opt_quota:
1676                 case Opt_usrquota:
1677                 case Opt_grpquota:
1678                         ext4_msg(sb, KERN_ERR,
1679                                 "quota options not supported");
1680                         break;
1681                 case Opt_usrjquota:
1682                 case Opt_grpjquota:
1683                 case Opt_offusrjquota:
1684                 case Opt_offgrpjquota:
1685                 case Opt_jqfmt_vfsold:
1686                 case Opt_jqfmt_vfsv0:
1687                 case Opt_jqfmt_vfsv1:
1688                         ext4_msg(sb, KERN_ERR,
1689                                 "journaled quota options not supported");
1690                         break;
1691                 case Opt_noquota:
1692                         break;
1693 #endif
1694                 case Opt_abort:
1695                         sbi->s_mount_flags |= EXT4_MF_FS_ABORTED;
1696                         break;
1697                 case Opt_nobarrier:
1698                         clear_opt(sbi->s_mount_opt, BARRIER);
1699                         break;
1700                 case Opt_barrier:
1701                         if (args[0].from) {
1702                                 if (match_int(&args[0], &option))
1703                                         return 0;
1704                         } else
1705                                 option = 1;     /* No argument, default to 1 */
1706                         if (option)
1707                                 set_opt(sbi->s_mount_opt, BARRIER);
1708                         else
1709                                 clear_opt(sbi->s_mount_opt, BARRIER);
1710                         break;
1711                 case Opt_ignore:
1712                         break;
1713                 case Opt_resize:
1714                         if (!is_remount) {
1715                                 ext4_msg(sb, KERN_ERR,
1716                                         "resize option only available "
1717                                         "for remount");
1718                                 return 0;
1719                         }
1720                         if (match_int(&args[0], &option) != 0)
1721                                 return 0;
1722                         *n_blocks_count = option;
1723                         break;
1724                 case Opt_nobh:
1725                         ext4_msg(sb, KERN_WARNING,
1726                                  "Ignoring deprecated nobh option");
1727                         break;
1728                 case Opt_bh:
1729                         ext4_msg(sb, KERN_WARNING,
1730                                  "Ignoring deprecated bh option");
1731                         break;
1732                 case Opt_i_version:
1733                         set_opt(sbi->s_mount_opt, I_VERSION);
1734                         sb->s_flags |= MS_I_VERSION;
1735                         break;
1736                 case Opt_nodelalloc:
1737                         clear_opt(sbi->s_mount_opt, DELALLOC);
1738                         break;
1739                 case Opt_mblk_io_submit:
1740                         set_opt(sbi->s_mount_opt, MBLK_IO_SUBMIT);
1741                         break;
1742                 case Opt_nomblk_io_submit:
1743                         clear_opt(sbi->s_mount_opt, MBLK_IO_SUBMIT);
1744                         break;
1745                 case Opt_stripe:
1746                         if (match_int(&args[0], &option))
1747                                 return 0;
1748                         if (option < 0)
1749                                 return 0;
1750                         sbi->s_stripe = option;
1751                         break;
1752                 case Opt_delalloc:
1753                         set_opt(sbi->s_mount_opt, DELALLOC);
1754                         break;
1755                 case Opt_block_validity:
1756                         set_opt(sbi->s_mount_opt, BLOCK_VALIDITY);
1757                         break;
1758                 case Opt_noblock_validity:
1759                         clear_opt(sbi->s_mount_opt, BLOCK_VALIDITY);
1760                         break;
1761                 case Opt_inode_readahead_blks:
1762                         if (match_int(&args[0], &option))
1763                                 return 0;
1764                         if (option < 0 || option > (1 << 30))
1765                                 return 0;
1766                         if (!is_power_of_2(option)) {
1767                                 ext4_msg(sb, KERN_ERR,
1768                                          "EXT4-fs: inode_readahead_blks"
1769                                          " must be a power of 2");
1770                                 return 0;
1771                         }
1772                         sbi->s_inode_readahead_blks = option;
1773                         break;
1774                 case Opt_journal_ioprio:
1775                         if (match_int(&args[0], &option))
1776                                 return 0;
1777                         if (option < 0 || option > 7)
1778                                 break;
1779                         *journal_ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE,
1780                                                             option);
1781                         break;
1782                 case Opt_noauto_da_alloc:
1783                         set_opt(sbi->s_mount_opt,NO_AUTO_DA_ALLOC);
1784                         break;
1785                 case Opt_auto_da_alloc:
1786                         if (args[0].from) {
1787                                 if (match_int(&args[0], &option))
1788                                         return 0;
1789                         } else
1790                                 option = 1;     /* No argument, default to 1 */
1791                         if (option)
1792                                 clear_opt(sbi->s_mount_opt, NO_AUTO_DA_ALLOC);
1793                         else
1794                                 set_opt(sbi->s_mount_opt,NO_AUTO_DA_ALLOC);
1795                         break;
1796                 case Opt_discard:
1797                         set_opt(sbi->s_mount_opt, DISCARD);
1798                         break;
1799                 case Opt_nodiscard:
1800                         clear_opt(sbi->s_mount_opt, DISCARD);
1801                         break;
1802                 case Opt_dioread_nolock:
1803                         set_opt(sbi->s_mount_opt, DIOREAD_NOLOCK);
1804                         break;
1805                 case Opt_dioread_lock:
1806                         clear_opt(sbi->s_mount_opt, DIOREAD_NOLOCK);
1807                         break;
1808                 case Opt_init_inode_table:
1809                         set_opt(sbi->s_mount_opt, INIT_INODE_TABLE);
1810                         if (args[0].from) {
1811                                 if (match_int(&args[0], &option))
1812                                         return 0;
1813                         } else
1814                                 option = EXT4_DEF_LI_WAIT_MULT;
1815                         if (option < 0)
1816                                 return 0;
1817                         sbi->s_li_wait_mult = option;
1818                         break;
1819                 case Opt_noinit_inode_table:
1820                         clear_opt(sbi->s_mount_opt, INIT_INODE_TABLE);
1821                         break;
1822                 default:
1823                         ext4_msg(sb, KERN_ERR,
1824                                "Unrecognized mount option \"%s\" "
1825                                "or missing value", p);
1826                         return 0;
1827                 }
1828         }
1829 #ifdef CONFIG_QUOTA
1830         if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1831                 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
1832                         clear_opt(sbi->s_mount_opt, USRQUOTA);
1833
1834                 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
1835                         clear_opt(sbi->s_mount_opt, GRPQUOTA);
1836
1837                 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
1838                         ext4_msg(sb, KERN_ERR, "old and new quota "
1839                                         "format mixing");
1840                         return 0;
1841                 }
1842
1843                 if (!sbi->s_jquota_fmt) {
1844                         ext4_msg(sb, KERN_ERR, "journaled quota format "
1845                                         "not specified");
1846                         return 0;
1847                 }
1848         } else {
1849                 if (sbi->s_jquota_fmt) {
1850                         ext4_msg(sb, KERN_ERR, "journaled quota format "
1851                                         "specified with no journaling "
1852                                         "enabled");
1853                         return 0;
1854                 }
1855         }
1856 #endif
1857         return 1;
1858 }
1859
1860 static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
1861                             int read_only)
1862 {
1863         struct ext4_sb_info *sbi = EXT4_SB(sb);
1864         int res = 0;
1865
1866         if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
1867                 ext4_msg(sb, KERN_ERR, "revision level too high, "
1868                          "forcing read-only mode");
1869                 res = MS_RDONLY;
1870         }
1871         if (read_only)
1872                 return res;
1873         if (!(sbi->s_mount_state & EXT4_VALID_FS))
1874                 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
1875                          "running e2fsck is recommended");
1876         else if ((sbi->s_mount_state & EXT4_ERROR_FS))
1877                 ext4_msg(sb, KERN_WARNING,
1878                          "warning: mounting fs with errors, "
1879                          "running e2fsck is recommended");
1880         else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
1881                  le16_to_cpu(es->s_mnt_count) >=
1882                  (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
1883                 ext4_msg(sb, KERN_WARNING,
1884                          "warning: maximal mount count reached, "
1885                          "running e2fsck is recommended");
1886         else if (le32_to_cpu(es->s_checkinterval) &&
1887                 (le32_to_cpu(es->s_lastcheck) +
1888                         le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1889                 ext4_msg(sb, KERN_WARNING,
1890                          "warning: checktime reached, "
1891                          "running e2fsck is recommended");
1892         if (!sbi->s_journal)
1893                 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
1894         if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
1895                 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
1896         le16_add_cpu(&es->s_mnt_count, 1);
1897         es->s_mtime = cpu_to_le32(get_seconds());
1898         ext4_update_dynamic_rev(sb);
1899         if (sbi->s_journal)
1900                 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
1901
1902         ext4_commit_super(sb, 1);
1903         if (test_opt(sb, DEBUG))
1904                 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
1905                                 "bpg=%lu, ipg=%lu, mo=%04x]\n",
1906                         sb->s_blocksize,
1907                         sbi->s_groups_count,
1908                         EXT4_BLOCKS_PER_GROUP(sb),
1909                         EXT4_INODES_PER_GROUP(sb),
1910                         sbi->s_mount_opt);
1911
1912         return res;
1913 }
1914
1915 static int ext4_fill_flex_info(struct super_block *sb)
1916 {
1917         struct ext4_sb_info *sbi = EXT4_SB(sb);
1918         struct ext4_group_desc *gdp = NULL;
1919         ext4_group_t flex_group_count;
1920         ext4_group_t flex_group;
1921         int groups_per_flex = 0;
1922         size_t size;
1923         int i;
1924
1925         sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
1926         groups_per_flex = 1 << sbi->s_log_groups_per_flex;
1927
1928         if (groups_per_flex < 2) {
1929                 sbi->s_log_groups_per_flex = 0;
1930                 return 1;
1931         }
1932
1933         /* We allocate both existing and potentially added groups */
1934         flex_group_count = ((sbi->s_groups_count + groups_per_flex - 1) +
1935                         ((le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) + 1) <<
1936                               EXT4_DESC_PER_BLOCK_BITS(sb))) / groups_per_flex;
1937         size = flex_group_count * sizeof(struct flex_groups);
1938         sbi->s_flex_groups = kzalloc(size, GFP_KERNEL);
1939         if (sbi->s_flex_groups == NULL) {
1940                 sbi->s_flex_groups = vmalloc(size);
1941                 if (sbi->s_flex_groups)
1942                         memset(sbi->s_flex_groups, 0, size);
1943         }
1944         if (sbi->s_flex_groups == NULL) {
1945                 ext4_msg(sb, KERN_ERR, "not enough memory for "
1946                                 "%u flex groups", flex_group_count);
1947                 goto failed;
1948         }
1949
1950         for (i = 0; i < sbi->s_groups_count; i++) {
1951                 gdp = ext4_get_group_desc(sb, i, NULL);
1952
1953                 flex_group = ext4_flex_group(sbi, i);
1954                 atomic_add(ext4_free_inodes_count(sb, gdp),
1955                            &sbi->s_flex_groups[flex_group].free_inodes);
1956                 atomic_add(ext4_free_blks_count(sb, gdp),
1957                            &sbi->s_flex_groups[flex_group].free_blocks);
1958                 atomic_add(ext4_used_dirs_count(sb, gdp),
1959                            &sbi->s_flex_groups[flex_group].used_dirs);
1960         }
1961
1962         return 1;
1963 failed:
1964         return 0;
1965 }
1966
1967 __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
1968                             struct ext4_group_desc *gdp)
1969 {
1970         __u16 crc = 0;
1971
1972         if (sbi->s_es->s_feature_ro_compat &
1973             cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) {
1974                 int offset = offsetof(struct ext4_group_desc, bg_checksum);
1975                 __le32 le_group = cpu_to_le32(block_group);
1976
1977                 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
1978                 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
1979                 crc = crc16(crc, (__u8 *)gdp, offset);
1980                 offset += sizeof(gdp->bg_checksum); /* skip checksum */
1981                 /* for checksum of struct ext4_group_desc do the rest...*/
1982                 if ((sbi->s_es->s_feature_incompat &
1983                      cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) &&
1984                     offset < le16_to_cpu(sbi->s_es->s_desc_size))
1985                         crc = crc16(crc, (__u8 *)gdp + offset,
1986                                     le16_to_cpu(sbi->s_es->s_desc_size) -
1987                                         offset);
1988         }
1989
1990         return cpu_to_le16(crc);
1991 }
1992
1993 int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 block_group,
1994                                 struct ext4_group_desc *gdp)
1995 {
1996         if ((sbi->s_es->s_feature_ro_compat &
1997              cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) &&
1998             (gdp->bg_checksum != ext4_group_desc_csum(sbi, block_group, gdp)))
1999                 return 0;
2000
2001         return 1;
2002 }
2003
2004 /* Called at mount-time, super-block is locked */
2005 static int ext4_check_descriptors(struct super_block *sb,
2006                                   ext4_group_t *first_not_zeroed)
2007 {
2008         struct ext4_sb_info *sbi = EXT4_SB(sb);
2009         ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
2010         ext4_fsblk_t last_block;
2011         ext4_fsblk_t block_bitmap;
2012         ext4_fsblk_t inode_bitmap;
2013         ext4_fsblk_t inode_table;
2014         int flexbg_flag = 0;
2015         ext4_group_t i, grp = sbi->s_groups_count;
2016
2017         if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
2018                 flexbg_flag = 1;
2019
2020         ext4_debug("Checking group descriptors");
2021
2022         for (i = 0; i < sbi->s_groups_count; i++) {
2023                 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
2024
2025                 if (i == sbi->s_groups_count - 1 || flexbg_flag)
2026                         last_block = ext4_blocks_count(sbi->s_es) - 1;
2027                 else
2028                         last_block = first_block +
2029                                 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
2030
2031                 if ((grp == sbi->s_groups_count) &&
2032                    !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2033                         grp = i;
2034
2035                 block_bitmap = ext4_block_bitmap(sb, gdp);
2036                 if (block_bitmap < first_block || block_bitmap > last_block) {
2037                         ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2038                                "Block bitmap for group %u not in group "
2039                                "(block %llu)!", i, block_bitmap);
2040                         return 0;
2041                 }
2042                 inode_bitmap = ext4_inode_bitmap(sb, gdp);
2043                 if (inode_bitmap < first_block || inode_bitmap > last_block) {
2044                         ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2045                                "Inode bitmap for group %u not in group "
2046                                "(block %llu)!", i, inode_bitmap);
2047                         return 0;
2048                 }
2049                 inode_table = ext4_inode_table(sb, gdp);
2050                 if (inode_table < first_block ||
2051                     inode_table + sbi->s_itb_per_group - 1 > last_block) {
2052                         ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2053                                "Inode table for group %u not in group "
2054                                "(block %llu)!", i, inode_table);
2055                         return 0;
2056                 }
2057                 ext4_lock_group(sb, i);
2058                 if (!ext4_group_desc_csum_verify(sbi, i, gdp)) {
2059                         ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2060                                  "Checksum for group %u failed (%u!=%u)",
2061                                  i, le16_to_cpu(ext4_group_desc_csum(sbi, i,
2062                                      gdp)), le16_to_cpu(gdp->bg_checksum));
2063                         if (!(sb->s_flags & MS_RDONLY)) {
2064                                 ext4_unlock_group(sb, i);
2065                                 return 0;
2066                         }
2067                 }
2068                 ext4_unlock_group(sb, i);
2069                 if (!flexbg_flag)
2070                         first_block += EXT4_BLOCKS_PER_GROUP(sb);
2071         }
2072         if (NULL != first_not_zeroed)
2073                 *first_not_zeroed = grp;
2074
2075         ext4_free_blocks_count_set(sbi->s_es, ext4_count_free_blocks(sb));
2076         sbi->s_es->s_free_inodes_count =cpu_to_le32(ext4_count_free_inodes(sb));
2077         return 1;
2078 }
2079
2080 /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
2081  * the superblock) which were deleted from all directories, but held open by
2082  * a process at the time of a crash.  We walk the list and try to delete these
2083  * inodes at recovery time (only with a read-write filesystem).
2084  *
2085  * In order to keep the orphan inode chain consistent during traversal (in
2086  * case of crash during recovery), we link each inode into the superblock
2087  * orphan list_head and handle it the same way as an inode deletion during
2088  * normal operation (which journals the operations for us).
2089  *
2090  * We only do an iget() and an iput() on each inode, which is very safe if we
2091  * accidentally point at an in-use or already deleted inode.  The worst that
2092  * can happen in this case is that we get a "bit already cleared" message from
2093  * ext4_free_inode().  The only reason we would point at a wrong inode is if
2094  * e2fsck was run on this filesystem, and it must have already done the orphan
2095  * inode cleanup for us, so we can safely abort without any further action.
2096  */
2097 static void ext4_orphan_cleanup(struct super_block *sb,
2098                                 struct ext4_super_block *es)
2099 {
2100         unsigned int s_flags = sb->s_flags;
2101         int nr_orphans = 0, nr_truncates = 0;
2102 #ifdef CONFIG_QUOTA
2103         int i;
2104 #endif
2105         if (!es->s_last_orphan) {
2106                 jbd_debug(4, "no orphan inodes to clean up\n");
2107                 return;
2108         }
2109
2110         if (bdev_read_only(sb->s_bdev)) {
2111                 ext4_msg(sb, KERN_ERR, "write access "
2112                         "unavailable, skipping orphan cleanup");
2113                 return;
2114         }
2115
2116         if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
2117                 if (es->s_last_orphan)
2118                         jbd_debug(1, "Errors on filesystem, "
2119                                   "clearing orphan list.\n");
2120                 es->s_last_orphan = 0;
2121                 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2122                 return;
2123         }
2124
2125         if (s_flags & MS_RDONLY) {
2126                 ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
2127                 sb->s_flags &= ~MS_RDONLY;
2128         }
2129 #ifdef CONFIG_QUOTA
2130         /* Needed for iput() to work correctly and not trash data */
2131         sb->s_flags |= MS_ACTIVE;
2132         /* Turn on quotas so that they are updated correctly */
2133         for (i = 0; i < MAXQUOTAS; i++) {
2134                 if (EXT4_SB(sb)->s_qf_names[i]) {
2135                         int ret = ext4_quota_on_mount(sb, i);
2136                         if (ret < 0)
2137                                 ext4_msg(sb, KERN_ERR,
2138                                         "Cannot turn on journaled "
2139                                         "quota: error %d", ret);
2140                 }
2141         }
2142 #endif
2143
2144         while (es->s_last_orphan) {
2145                 struct inode *inode;
2146
2147                 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
2148                 if (IS_ERR(inode)) {
2149                         es->s_last_orphan = 0;
2150                         break;
2151                 }
2152
2153                 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
2154                 dquot_initialize(inode);
2155                 if (inode->i_nlink) {
2156                         ext4_msg(sb, KERN_DEBUG,
2157                                 "%s: truncating inode %lu to %lld bytes",
2158                                 __func__, inode->i_ino, inode->i_size);
2159                         jbd_debug(2, "truncating inode %lu to %lld bytes\n",
2160                                   inode->i_ino, inode->i_size);
2161                         ext4_truncate(inode);
2162                         nr_truncates++;
2163                 } else {
2164                         ext4_msg(sb, KERN_DEBUG,
2165                                 "%s: deleting unreferenced inode %lu",
2166                                 __func__, inode->i_ino);
2167                         jbd_debug(2, "deleting unreferenced inode %lu\n",
2168                                   inode->i_ino);
2169                         nr_orphans++;
2170                 }
2171                 iput(inode);  /* The delete magic happens here! */
2172         }
2173
2174 #define PLURAL(x) (x), ((x) == 1) ? "" : "s"
2175
2176         if (nr_orphans)
2177                 ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
2178                        PLURAL(nr_orphans));
2179         if (nr_truncates)
2180                 ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
2181                        PLURAL(nr_truncates));
2182 #ifdef CONFIG_QUOTA
2183         /* Turn quotas off */
2184         for (i = 0; i < MAXQUOTAS; i++) {
2185                 if (sb_dqopt(sb)->files[i])
2186                         dquot_quota_off(sb, i);
2187         }
2188 #endif
2189         sb->s_flags = s_flags; /* Restore MS_RDONLY status */
2190 }
2191
2192 /*
2193  * Maximal extent format file size.
2194  * Resulting logical blkno at s_maxbytes must fit in our on-disk
2195  * extent format containers, within a sector_t, and within i_blocks
2196  * in the vfs.  ext4 inode has 48 bits of i_block in fsblock units,
2197  * so that won't be a limiting factor.
2198  *
2199  * Note, this does *not* consider any metadata overhead for vfs i_blocks.
2200  */
2201 static loff_t ext4_max_size(int blkbits, int has_huge_files)
2202 {
2203         loff_t res;
2204         loff_t upper_limit = MAX_LFS_FILESIZE;
2205
2206         /* small i_blocks in vfs inode? */
2207         if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
2208                 /*
2209                  * CONFIG_LBDAF is not enabled implies the inode
2210                  * i_block represent total blocks in 512 bytes
2211                  * 32 == size of vfs inode i_blocks * 8
2212                  */
2213                 upper_limit = (1LL << 32) - 1;
2214
2215                 /* total blocks in file system block size */
2216                 upper_limit >>= (blkbits - 9);
2217                 upper_limit <<= blkbits;
2218         }
2219
2220         /* 32-bit extent-start container, ee_block */
2221         res = 1LL << 32;
2222         res <<= blkbits;
2223         res -= 1;
2224
2225         /* Sanity check against vm- & vfs- imposed limits */
2226         if (res > upper_limit)
2227                 res = upper_limit;
2228
2229         return res;
2230 }
2231
2232 /*
2233  * Maximal bitmap file size.  There is a direct, and {,double-,triple-}indirect
2234  * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2235  * We need to be 1 filesystem block less than the 2^48 sector limit.
2236  */
2237 static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
2238 {
2239         loff_t res = EXT4_NDIR_BLOCKS;
2240         int meta_blocks;
2241         loff_t upper_limit;
2242         /* This is calculated to be the largest file size for a dense, block
2243          * mapped file such that the file's total number of 512-byte sectors,
2244          * including data and all indirect blocks, does not exceed (2^48 - 1).
2245          *
2246          * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2247          * number of 512-byte sectors of the file.
2248          */
2249
2250         if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
2251                 /*
2252                  * !has_huge_files or CONFIG_LBDAF not enabled implies that
2253                  * the inode i_block field represents total file blocks in
2254                  * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
2255                  */
2256                 upper_limit = (1LL << 32) - 1;
2257
2258                 /* total blocks in file system block size */
2259                 upper_limit >>= (bits - 9);
2260
2261         } else {
2262                 /*
2263                  * We use 48 bit ext4_inode i_blocks
2264                  * With EXT4_HUGE_FILE_FL set the i_blocks
2265                  * represent total number of blocks in
2266                  * file system block size
2267                  */
2268                 upper_limit = (1LL << 48) - 1;
2269
2270         }
2271
2272         /* indirect blocks */
2273         meta_blocks = 1;
2274         /* double indirect blocks */
2275         meta_blocks += 1 + (1LL << (bits-2));
2276         /* tripple indirect blocks */
2277         meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
2278
2279         upper_limit -= meta_blocks;
2280         upper_limit <<= bits;
2281
2282         res += 1LL << (bits-2);
2283         res += 1LL << (2*(bits-2));
2284         res += 1LL << (3*(bits-2));
2285         res <<= bits;
2286         if (res > upper_limit)
2287                 res = upper_limit;
2288
2289         if (res > MAX_LFS_FILESIZE)
2290                 res = MAX_LFS_FILESIZE;
2291
2292         return res;
2293 }
2294
2295 static ext4_fsblk_t descriptor_loc(struct super_block *sb,
2296                                    ext4_fsblk_t logical_sb_block, int nr)
2297 {
2298         struct ext4_sb_info *sbi = EXT4_SB(sb);
2299         ext4_group_t bg, first_meta_bg;
2300         int has_super = 0;
2301
2302         first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
2303
2304         if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
2305             nr < first_meta_bg)
2306                 return logical_sb_block + nr + 1;
2307         bg = sbi->s_desc_per_block * nr;
2308         if (ext4_bg_has_super(sb, bg))
2309                 has_super = 1;
2310
2311         return (has_super + ext4_group_first_block_no(sb, bg));
2312 }
2313
2314 /**
2315  * ext4_get_stripe_size: Get the stripe size.
2316  * @sbi: In memory super block info
2317  *
2318  * If we have specified it via mount option, then
2319  * use the mount option value. If the value specified at mount time is
2320  * greater than the blocks per group use the super block value.
2321  * If the super block value is greater than blocks per group return 0.
2322  * Allocator needs it be less than blocks per group.
2323  *
2324  */
2325 static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
2326 {
2327         unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
2328         unsigned long stripe_width =
2329                         le32_to_cpu(sbi->s_es->s_raid_stripe_width);
2330
2331         if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
2332                 return sbi->s_stripe;
2333
2334         if (stripe_width <= sbi->s_blocks_per_group)
2335                 return stripe_width;
2336
2337         if (stride <= sbi->s_blocks_per_group)
2338                 return stride;
2339
2340         return 0;
2341 }
2342
2343 /* sysfs supprt */
2344
2345 struct ext4_attr {
2346         struct attribute attr;
2347         ssize_t (*show)(struct ext4_attr *, struct ext4_sb_info *, char *);
2348         ssize_t (*store)(struct ext4_attr *, struct ext4_sb_info *,
2349                          const char *, size_t);
2350         int offset;
2351 };
2352
2353 static int parse_strtoul(const char *buf,
2354                 unsigned long max, unsigned long *value)
2355 {
2356         char *endp;
2357
2358         *value = simple_strtoul(skip_spaces(buf), &endp, 0);
2359         endp = skip_spaces(endp);
2360         if (*endp || *value > max)
2361                 return -EINVAL;
2362
2363         return 0;
2364 }
2365
2366 static ssize_t delayed_allocation_blocks_show(struct ext4_attr *a,
2367                                               struct ext4_sb_info *sbi,
2368                                               char *buf)
2369 {
2370         return snprintf(buf, PAGE_SIZE, "%llu\n",
2371                         (s64) percpu_counter_sum(&sbi->s_dirtyblocks_counter));
2372 }
2373
2374 static ssize_t session_write_kbytes_show(struct ext4_attr *a,
2375                                          struct ext4_sb_info *sbi, char *buf)
2376 {
2377         struct super_block *sb = sbi->s_buddy_cache->i_sb;
2378
2379         if (!sb->s_bdev->bd_part)
2380                 return snprintf(buf, PAGE_SIZE, "0\n");
2381         return snprintf(buf, PAGE_SIZE, "%lu\n",
2382                         (part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
2383                          sbi->s_sectors_written_start) >> 1);
2384 }
2385
2386 static ssize_t lifetime_write_kbytes_show(struct ext4_attr *a,
2387                                           struct ext4_sb_info *sbi, char *buf)
2388 {
2389         struct super_block *sb = sbi->s_buddy_cache->i_sb;
2390
2391         if (!sb->s_bdev->bd_part)
2392                 return snprintf(buf, PAGE_SIZE, "0\n");
2393         return snprintf(buf, PAGE_SIZE, "%llu\n",
2394                         (unsigned long long)(sbi->s_kbytes_written +
2395                         ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
2396                           EXT4_SB(sb)->s_sectors_written_start) >> 1)));
2397 }
2398
2399 static ssize_t inode_readahead_blks_store(struct ext4_attr *a,
2400                                           struct ext4_sb_info *sbi,
2401                                           const char *buf, size_t count)
2402 {
2403         unsigned long t;
2404
2405         if (parse_strtoul(buf, 0x40000000, &t))
2406                 return -EINVAL;
2407
2408         if (!is_power_of_2(t))
2409                 return -EINVAL;
2410
2411         sbi->s_inode_readahead_blks = t;
2412         return count;
2413 }
2414
2415 static ssize_t sbi_ui_show(struct ext4_attr *a,
2416                            struct ext4_sb_info *sbi, char *buf)
2417 {
2418         unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
2419
2420         return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
2421 }
2422
2423 static ssize_t sbi_ui_store(struct ext4_attr *a,
2424                             struct ext4_sb_info *sbi,
2425                             const char *buf, size_t count)
2426 {
2427         unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
2428         unsigned long t;
2429
2430         if (parse_strtoul(buf, 0xffffffff, &t))
2431                 return -EINVAL;
2432         *ui = t;
2433         return count;
2434 }
2435
2436 #define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \
2437 static struct ext4_attr ext4_attr_##_name = {                   \
2438         .attr = {.name = __stringify(_name), .mode = _mode },   \
2439         .show   = _show,                                        \
2440         .store  = _store,                                       \
2441         .offset = offsetof(struct ext4_sb_info, _elname),       \
2442 }
2443 #define EXT4_ATTR(name, mode, show, store) \
2444 static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store)
2445
2446 #define EXT4_INFO_ATTR(name) EXT4_ATTR(name, 0444, NULL, NULL)
2447 #define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL)
2448 #define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store)
2449 #define EXT4_RW_ATTR_SBI_UI(name, elname)       \
2450         EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname)
2451 #define ATTR_LIST(name) &ext4_attr_##name.attr
2452
2453 EXT4_RO_ATTR(delayed_allocation_blocks);
2454 EXT4_RO_ATTR(session_write_kbytes);
2455 EXT4_RO_ATTR(lifetime_write_kbytes);
2456 EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, sbi_ui_show,
2457                  inode_readahead_blks_store, s_inode_readahead_blks);
2458 EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal);
2459 EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats);
2460 EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan);
2461 EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan);
2462 EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs);
2463 EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request);
2464 EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc);
2465 EXT4_RW_ATTR_SBI_UI(max_writeback_mb_bump, s_max_writeback_mb_bump);
2466
2467 static struct attribute *ext4_attrs[] = {
2468         ATTR_LIST(delayed_allocation_blocks),
2469         ATTR_LIST(session_write_kbytes),
2470         ATTR_LIST(lifetime_write_kbytes),
2471         ATTR_LIST(inode_readahead_blks),
2472         ATTR_LIST(inode_goal),
2473         ATTR_LIST(mb_stats),
2474         ATTR_LIST(mb_max_to_scan),
2475         ATTR_LIST(mb_min_to_scan),
2476         ATTR_LIST(mb_order2_req),
2477         ATTR_LIST(mb_stream_req),
2478         ATTR_LIST(mb_group_prealloc),
2479         ATTR_LIST(max_writeback_mb_bump),
2480         NULL,
2481 };
2482
2483 /* Features this copy of ext4 supports */
2484 EXT4_INFO_ATTR(lazy_itable_init);
2485 EXT4_INFO_ATTR(batched_discard);
2486
2487 static struct attribute *ext4_feat_attrs[] = {
2488         ATTR_LIST(lazy_itable_init),
2489         ATTR_LIST(batched_discard),
2490         NULL,
2491 };
2492
2493 static ssize_t ext4_attr_show(struct kobject *kobj,
2494                               struct attribute *attr, char *buf)
2495 {
2496         struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2497                                                 s_kobj);
2498         struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2499
2500         return a->show ? a->show(a, sbi, buf) : 0;
2501 }
2502
2503 static ssize_t ext4_attr_store(struct kobject *kobj,
2504                                struct attribute *attr,
2505                                const char *buf, size_t len)
2506 {
2507         struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2508                                                 s_kobj);
2509         struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2510
2511         return a->store ? a->store(a, sbi, buf, len) : 0;
2512 }
2513
2514 static void ext4_sb_release(struct kobject *kobj)
2515 {
2516         struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2517                                                 s_kobj);
2518         complete(&sbi->s_kobj_unregister);
2519 }
2520
2521 static const struct sysfs_ops ext4_attr_ops = {
2522         .show   = ext4_attr_show,
2523         .store  = ext4_attr_store,
2524 };
2525
2526 static struct kobj_type ext4_ktype = {
2527         .default_attrs  = ext4_attrs,
2528         .sysfs_ops      = &ext4_attr_ops,
2529         .release        = ext4_sb_release,
2530 };
2531
2532 static void ext4_feat_release(struct kobject *kobj)
2533 {
2534         complete(&ext4_feat->f_kobj_unregister);
2535 }
2536
2537 static struct kobj_type ext4_feat_ktype = {
2538         .default_attrs  = ext4_feat_attrs,
2539         .sysfs_ops      = &ext4_attr_ops,
2540         .release        = ext4_feat_release,
2541 };
2542
2543 /*
2544  * Check whether this filesystem can be mounted based on
2545  * the features present and the RDONLY/RDWR mount requested.
2546  * Returns 1 if this filesystem can be mounted as requested,
2547  * 0 if it cannot be.
2548  */
2549 static int ext4_feature_set_ok(struct super_block *sb, int readonly)
2550 {
2551         if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP)) {
2552                 ext4_msg(sb, KERN_ERR,
2553                         "Couldn't mount because of "
2554                         "unsupported optional features (%x)",
2555                         (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
2556                         ~EXT4_FEATURE_INCOMPAT_SUPP));
2557                 return 0;
2558         }
2559
2560         if (readonly)
2561                 return 1;
2562
2563         /* Check that feature set is OK for a read-write mount */
2564         if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP)) {
2565                 ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of "
2566                          "unsupported optional features (%x)",
2567                          (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
2568                                 ~EXT4_FEATURE_RO_COMPAT_SUPP));
2569                 return 0;
2570         }
2571         /*
2572          * Large file size enabled file system can only be mounted
2573          * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
2574          */
2575         if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) {
2576                 if (sizeof(blkcnt_t) < sizeof(u64)) {
2577                         ext4_msg(sb, KERN_ERR, "Filesystem with huge files "
2578                                  "cannot be mounted RDWR without "
2579                                  "CONFIG_LBDAF");
2580                         return 0;
2581                 }
2582         }
2583         return 1;
2584 }
2585
2586 /*
2587  * This function is called once a day if we have errors logged
2588  * on the file system
2589  */
2590 static void print_daily_error_info(unsigned long arg)
2591 {
2592         struct super_block *sb = (struct super_block *) arg;
2593         struct ext4_sb_info *sbi;
2594         struct ext4_super_block *es;
2595
2596         sbi = EXT4_SB(sb);
2597         es = sbi->s_es;
2598
2599         if (es->s_error_count)
2600                 ext4_msg(sb, KERN_NOTICE, "error count: %u",
2601                          le32_to_cpu(es->s_error_count));
2602         if (es->s_first_error_time) {
2603                 printk(KERN_NOTICE "EXT4-fs (%s): initial error at %u: %.*s:%d",
2604                        sb->s_id, le32_to_cpu(es->s_first_error_time),
2605                        (int) sizeof(es->s_first_error_func),
2606                        es->s_first_error_func,
2607                        le32_to_cpu(es->s_first_error_line));
2608                 if (es->s_first_error_ino)
2609                         printk(": inode %u",
2610                                le32_to_cpu(es->s_first_error_ino));
2611                 if (es->s_first_error_block)
2612                         printk(": block %llu", (unsigned long long)
2613                                le64_to_cpu(es->s_first_error_block));
2614                 printk("\n");
2615         }
2616         if (es->s_last_error_time) {
2617                 printk(KERN_NOTICE "EXT4-fs (%s): last error at %u: %.*s:%d",
2618                        sb->s_id, le32_to_cpu(es->s_last_error_time),
2619                        (int) sizeof(es->s_last_error_func),
2620                        es->s_last_error_func,
2621                        le32_to_cpu(es->s_last_error_line));
2622                 if (es->s_last_error_ino)
2623                         printk(": inode %u",
2624                                le32_to_cpu(es->s_last_error_ino));
2625                 if (es->s_last_error_block)
2626                         printk(": block %llu", (unsigned long long)
2627                                le64_to_cpu(es->s_last_error_block));
2628                 printk("\n");
2629         }
2630         mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ);  /* Once a day */
2631 }
2632
2633 static void ext4_lazyinode_timeout(unsigned long data)
2634 {
2635         struct task_struct *p = (struct task_struct *)data;
2636         wake_up_process(p);
2637 }
2638
2639 /* Find next suitable group and run ext4_init_inode_table */
2640 static int ext4_run_li_request(struct ext4_li_request *elr)
2641 {
2642         struct ext4_group_desc *gdp = NULL;
2643         ext4_group_t group, ngroups;
2644         struct super_block *sb;
2645         unsigned long timeout = 0;
2646         int ret = 0;
2647
2648         sb = elr->lr_super;
2649         ngroups = EXT4_SB(sb)->s_groups_count;
2650
2651         for (group = elr->lr_next_group; group < ngroups; group++) {
2652                 gdp = ext4_get_group_desc(sb, group, NULL);
2653                 if (!gdp) {
2654                         ret = 1;
2655                         break;
2656                 }
2657
2658                 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2659                         break;
2660         }
2661
2662         if (group == ngroups)
2663                 ret = 1;
2664
2665         if (!ret) {
2666                 timeout = jiffies;
2667                 ret = ext4_init_inode_table(sb, group,
2668                                             elr->lr_timeout ? 0 : 1);
2669                 if (elr->lr_timeout == 0) {
2670                         timeout = jiffies - timeout;
2671                         if (elr->lr_sbi->s_li_wait_mult)
2672                                 timeout *= elr->lr_sbi->s_li_wait_mult;
2673                         else
2674                                 timeout *= 20;
2675                         elr->lr_timeout = timeout;
2676                 }
2677                 elr->lr_next_sched = jiffies + elr->lr_timeout;
2678                 elr->lr_next_group = group + 1;
2679         }
2680
2681         return ret;
2682 }
2683
2684 /*
2685  * Remove lr_request from the list_request and free the
2686  * request tructure. Should be called with li_list_mtx held
2687  */
2688 static void ext4_remove_li_request(struct ext4_li_request *elr)
2689 {
2690         struct ext4_sb_info *sbi;
2691
2692         if (!elr)
2693                 return;
2694
2695         sbi = elr->lr_sbi;
2696
2697         list_del(&elr->lr_request);
2698         sbi->s_li_request = NULL;
2699         kfree(elr);
2700 }
2701
2702 static void ext4_unregister_li_request(struct super_block *sb)
2703 {
2704         struct ext4_li_request *elr = EXT4_SB(sb)->s_li_request;
2705
2706         if (!ext4_li_info)
2707                 return;
2708
2709         mutex_lock(&ext4_li_info->li_list_mtx);
2710         ext4_remove_li_request(elr);
2711         mutex_unlock(&ext4_li_info->li_list_mtx);
2712 }
2713
2714 /*
2715  * This is the function where ext4lazyinit thread lives. It walks
2716  * through the request list searching for next scheduled filesystem.
2717  * When such a fs is found, run the lazy initialization request
2718  * (ext4_rn_li_request) and keep track of the time spend in this
2719  * function. Based on that time we compute next schedule time of
2720  * the request. When walking through the list is complete, compute
2721  * next waking time and put itself into sleep.
2722  */
2723 static int ext4_lazyinit_thread(void *arg)
2724 {
2725         struct ext4_lazy_init *eli = (struct ext4_lazy_init *)arg;
2726         struct list_head *pos, *n;
2727         struct ext4_li_request *elr;
2728         unsigned long next_wakeup;
2729         DEFINE_WAIT(wait);
2730
2731         BUG_ON(NULL == eli);
2732
2733         eli->li_timer.data = (unsigned long)current;
2734         eli->li_timer.function = ext4_lazyinode_timeout;
2735
2736         eli->li_task = current;
2737         wake_up(&eli->li_wait_task);
2738
2739 cont_thread:
2740         while (true) {
2741                 next_wakeup = MAX_JIFFY_OFFSET;
2742
2743                 mutex_lock(&eli->li_list_mtx);
2744                 if (list_empty(&eli->li_request_list)) {
2745                         mutex_unlock(&eli->li_list_mtx);
2746                         goto exit_thread;
2747                 }
2748
2749                 list_for_each_safe(pos, n, &eli->li_request_list) {
2750                         elr = list_entry(pos, struct ext4_li_request,
2751                                          lr_request);
2752
2753                         if (time_after_eq(jiffies, elr->lr_next_sched)) {
2754                                 if (ext4_run_li_request(elr) != 0) {
2755                                         /* error, remove the lazy_init job */
2756                                         ext4_remove_li_request(elr);
2757                                         continue;
2758                                 }
2759                         }
2760
2761                         if (time_before(elr->lr_next_sched, next_wakeup))
2762                                 next_wakeup = elr->lr_next_sched;
2763                 }
2764                 mutex_unlock(&eli->li_list_mtx);
2765
2766                 if (freezing(current))
2767                         refrigerator();
2768
2769                 if ((time_after_eq(jiffies, next_wakeup)) ||
2770                     (MAX_JIFFY_OFFSET == next_wakeup)) {
2771                         cond_resched();
2772                         continue;
2773                 }
2774
2775                 eli->li_timer.expires = next_wakeup;
2776                 add_timer(&eli->li_timer);
2777                 prepare_to_wait(&eli->li_wait_daemon, &wait,
2778                                 TASK_INTERRUPTIBLE);
2779                 if (time_before(jiffies, next_wakeup))
2780                         schedule();
2781                 finish_wait(&eli->li_wait_daemon, &wait);
2782         }
2783
2784 exit_thread:
2785         /*
2786          * It looks like the request list is empty, but we need
2787          * to check it under the li_list_mtx lock, to prevent any
2788          * additions into it, and of course we should lock ext4_li_mtx
2789          * to atomically free the list and ext4_li_info, because at
2790          * this point another ext4 filesystem could be registering
2791          * new one.
2792          */
2793         mutex_lock(&ext4_li_mtx);
2794         mutex_lock(&eli->li_list_mtx);
2795         if (!list_empty(&eli->li_request_list)) {
2796                 mutex_unlock(&eli->li_list_mtx);
2797                 mutex_unlock(&ext4_li_mtx);
2798                 goto cont_thread;
2799         }
2800         mutex_unlock(&eli->li_list_mtx);
2801         del_timer_sync(&ext4_li_info->li_timer);
2802         eli->li_task = NULL;
2803         wake_up(&eli->li_wait_task);
2804
2805         kfree(ext4_li_info);
2806         ext4_li_info = NULL;
2807         mutex_unlock(&ext4_li_mtx);
2808
2809         return 0;
2810 }
2811
2812 static void ext4_clear_request_list(void)
2813 {
2814         struct list_head *pos, *n;
2815         struct ext4_li_request *elr;
2816
2817         mutex_lock(&ext4_li_info->li_list_mtx);
2818         list_for_each_safe(pos, n, &ext4_li_info->li_request_list) {
2819                 elr = list_entry(pos, struct ext4_li_request,
2820                                  lr_request);
2821                 ext4_remove_li_request(elr);
2822         }
2823         mutex_unlock(&ext4_li_info->li_list_mtx);
2824 }
2825
2826 static int ext4_run_lazyinit_thread(void)
2827 {
2828         struct task_struct *t;
2829
2830         t = kthread_run(ext4_lazyinit_thread, ext4_li_info, "ext4lazyinit");
2831         if (IS_ERR(t)) {
2832                 int err = PTR_ERR(t);
2833                 ext4_clear_request_list();
2834                 del_timer_sync(&ext4_li_info->li_timer);
2835                 kfree(ext4_li_info);
2836                 ext4_li_info = NULL;
2837                 printk(KERN_CRIT "EXT4: error %d creating inode table "
2838                                  "initialization thread\n",
2839                                  err);
2840                 return err;
2841         }
2842         ext4_li_info->li_state |= EXT4_LAZYINIT_RUNNING;
2843
2844         wait_event(ext4_li_info->li_wait_task, ext4_li_info->li_task != NULL);
2845         return 0;
2846 }
2847
2848 /*
2849  * Check whether it make sense to run itable init. thread or not.
2850  * If there is at least one uninitialized inode table, return
2851  * corresponding group number, else the loop goes through all
2852  * groups and return total number of groups.
2853  */
2854 static ext4_group_t ext4_has_uninit_itable(struct super_block *sb)
2855 {
2856         ext4_group_t group, ngroups = EXT4_SB(sb)->s_groups_count;
2857         struct ext4_group_desc *gdp = NULL;
2858
2859         for (group = 0; group < ngroups; group++) {
2860                 gdp = ext4_get_group_desc(sb, group, NULL);
2861                 if (!gdp)
2862                         continue;
2863
2864                 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2865                         break;
2866         }
2867
2868         return group;
2869 }
2870
2871 static int ext4_li_info_new(void)
2872 {
2873         struct ext4_lazy_init *eli = NULL;
2874
2875         eli = kzalloc(sizeof(*eli), GFP_KERNEL);
2876         if (!eli)
2877                 return -ENOMEM;
2878
2879         eli->li_task = NULL;
2880         INIT_LIST_HEAD(&eli->li_request_list);
2881         mutex_init(&eli->li_list_mtx);
2882
2883         init_waitqueue_head(&eli->li_wait_daemon);
2884         init_waitqueue_head(&eli->li_wait_task);
2885         init_timer(&eli->li_timer);
2886         eli->li_state |= EXT4_LAZYINIT_QUIT;
2887
2888         ext4_li_info = eli;
2889
2890         return 0;
2891 }
2892
2893 static struct ext4_li_request *ext4_li_request_new(struct super_block *sb,
2894                                             ext4_group_t start)
2895 {
2896         struct ext4_sb_info *sbi = EXT4_SB(sb);
2897         struct ext4_li_request *elr;
2898         unsigned long rnd;
2899
2900         elr = kzalloc(sizeof(*elr), GFP_KERNEL);
2901         if (!elr)
2902                 return NULL;
2903
2904         elr->lr_super = sb;
2905         elr->lr_sbi = sbi;
2906         elr->lr_next_group = start;
2907
2908         /*
2909          * Randomize first schedule time of the request to
2910          * spread the inode table initialization requests
2911          * better.
2912          */
2913         get_random_bytes(&rnd, sizeof(rnd));
2914         elr->lr_next_sched = jiffies + (unsigned long)rnd %
2915                              (EXT4_DEF_LI_MAX_START_DELAY * HZ);
2916
2917         return elr;
2918 }
2919
2920 static int ext4_register_li_request(struct super_block *sb,
2921                                     ext4_group_t first_not_zeroed)
2922 {
2923         struct ext4_sb_info *sbi = EXT4_SB(sb);
2924         struct ext4_li_request *elr;
2925         ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
2926         int ret;
2927
2928         if (sbi->s_li_request != NULL)
2929                 return 0;
2930
2931         if (first_not_zeroed == ngroups ||
2932             (sb->s_flags & MS_RDONLY) ||
2933             !test_opt(sb, INIT_INODE_TABLE)) {
2934                 sbi->s_li_request = NULL;
2935                 return 0;
2936         }
2937
2938         if (first_not_zeroed == ngroups) {
2939                 sbi->s_li_request = NULL;
2940                 return 0;
2941         }
2942
2943         elr = ext4_li_request_new(sb, first_not_zeroed);
2944         if (!elr)
2945                 return -ENOMEM;
2946
2947         mutex_lock(&ext4_li_mtx);
2948
2949         if (NULL == ext4_li_info) {
2950                 ret = ext4_li_info_new();
2951                 if (ret)
2952                         goto out;
2953         }
2954
2955         mutex_lock(&ext4_li_info->li_list_mtx);
2956         list_add(&elr->lr_request, &ext4_li_info->li_request_list);
2957         mutex_unlock(&ext4_li_info->li_list_mtx);
2958
2959         sbi->s_li_request = elr;
2960
2961         if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) {
2962                 ret = ext4_run_lazyinit_thread();
2963                 if (ret)
2964                         goto out;
2965         }
2966 out:
2967         mutex_unlock(&ext4_li_mtx);
2968         if (ret)
2969                 kfree(elr);
2970         return ret;
2971 }
2972
2973 /*
2974  * We do not need to lock anything since this is called on
2975  * module unload.
2976  */
2977 static void ext4_destroy_lazyinit_thread(void)
2978 {
2979         /*
2980          * If thread exited earlier
2981          * there's nothing to be done.
2982          */
2983         if (!ext4_li_info)
2984                 return;
2985
2986         ext4_clear_request_list();
2987
2988         while (ext4_li_info->li_task) {
2989                 wake_up(&ext4_li_info->li_wait_daemon);
2990                 wait_event(ext4_li_info->li_wait_task,
2991                            ext4_li_info->li_task == NULL);
2992         }
2993 }
2994
2995 static int ext4_fill_super(struct super_block *sb, void *data, int silent)
2996                                 __releases(kernel_lock)
2997                                 __acquires(kernel_lock)
2998 {
2999         char *orig_data = kstrdup(data, GFP_KERNEL);
3000         struct buffer_head *bh;
3001         struct ext4_super_block *es = NULL;
3002         struct ext4_sb_info *sbi;
3003         ext4_fsblk_t block;
3004         ext4_fsblk_t sb_block = get_sb_block(&data);
3005         ext4_fsblk_t logical_sb_block;
3006         unsigned long offset = 0;
3007         unsigned long journal_devnum = 0;
3008         unsigned long def_mount_opts;
3009         struct inode *root;
3010         char *cp;
3011         const char *descr;
3012         int ret = -ENOMEM;
3013         int blocksize;
3014         unsigned int db_count;
3015         unsigned int i;
3016         int needs_recovery, has_huge_files;
3017         __u64 blocks_count;
3018         int err;
3019         unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
3020         ext4_group_t first_not_zeroed;
3021
3022         sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
3023         if (!sbi)
3024                 goto out_free_orig;
3025
3026         sbi->s_blockgroup_lock =
3027                 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
3028         if (!sbi->s_blockgroup_lock) {
3029                 kfree(sbi);
3030                 goto out_free_orig;
3031         }
3032         sb->s_fs_info = sbi;
3033         sbi->s_mount_opt = 0;
3034         sbi->s_resuid = EXT4_DEF_RESUID;
3035         sbi->s_resgid = EXT4_DEF_RESGID;
3036         sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
3037         sbi->s_sb_block = sb_block;
3038         if (sb->s_bdev->bd_part)
3039                 sbi->s_sectors_written_start =
3040                         part_stat_read(sb->s_bdev->bd_part, sectors[1]);
3041
3042         /* Cleanup superblock name */
3043         for (cp = sb->s_id; (cp = strchr(cp, '/'));)
3044                 *cp = '!';
3045
3046         ret = -EINVAL;
3047         blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
3048         if (!blocksize) {
3049                 ext4_msg(sb, KERN_ERR, "unable to set blocksize");
3050                 goto out_fail;
3051         }
3052
3053         /*
3054          * The ext4 superblock will not be buffer aligned for other than 1kB
3055          * block sizes.  We need to calculate the offset from buffer start.
3056          */
3057         if (blocksize != EXT4_MIN_BLOCK_SIZE) {
3058                 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3059                 offset = do_div(logical_sb_block, blocksize);
3060         } else {
3061                 logical_sb_block = sb_block;
3062         }
3063
3064         if (!(bh = sb_bread(sb, logical_sb_block))) {
3065                 ext4_msg(sb, KERN_ERR, "unable to read superblock");
3066                 goto out_fail;
3067         }
3068         /*
3069          * Note: s_es must be initialized as soon as possible because
3070          *       some ext4 macro-instructions depend on its value
3071          */
3072         es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
3073         sbi->s_es = es;
3074         sb->s_magic = le16_to_cpu(es->s_magic);
3075         if (sb->s_magic != EXT4_SUPER_MAGIC)
3076                 goto cantfind_ext4;
3077         sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
3078
3079         /* Set defaults before we parse the mount options */
3080         def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
3081         set_opt(sbi->s_mount_opt, INIT_INODE_TABLE);
3082         if (def_mount_opts & EXT4_DEFM_DEBUG)
3083                 set_opt(sbi->s_mount_opt, DEBUG);
3084         if (def_mount_opts & EXT4_DEFM_BSDGROUPS) {
3085                 ext4_msg(sb, KERN_WARNING, deprecated_msg, "bsdgroups",
3086                         "2.6.38");
3087                 set_opt(sbi->s_mount_opt, GRPID);
3088         }
3089         if (def_mount_opts & EXT4_DEFM_UID16)
3090                 set_opt(sbi->s_mount_opt, NO_UID32);
3091 #ifdef CONFIG_EXT4_FS_XATTR
3092         if (def_mount_opts & EXT4_DEFM_XATTR_USER)
3093                 set_opt(sbi->s_mount_opt, XATTR_USER);
3094 #endif
3095 #ifdef CONFIG_EXT4_FS_POSIX_ACL
3096         if (def_mount_opts & EXT4_DEFM_ACL)
3097                 set_opt(sbi->s_mount_opt, POSIX_ACL);
3098 #endif
3099         if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
3100                 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
3101         else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
3102                 set_opt(sbi->s_mount_opt, ORDERED_DATA);
3103         else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
3104                 set_opt(sbi->s_mount_opt, WRITEBACK_DATA);
3105
3106         if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
3107                 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
3108         else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
3109                 set_opt(sbi->s_mount_opt, ERRORS_CONT);
3110         else
3111                 set_opt(sbi->s_mount_opt, ERRORS_RO);
3112         if (def_mount_opts & EXT4_DEFM_BLOCK_VALIDITY)
3113                 set_opt(sbi->s_mount_opt, BLOCK_VALIDITY);
3114         if (def_mount_opts & EXT4_DEFM_DISCARD)
3115                 set_opt(sbi->s_mount_opt, DISCARD);
3116
3117         sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
3118         sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
3119         sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
3120         sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
3121         sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
3122
3123         if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0)
3124                 set_opt(sbi->s_mount_opt, BARRIER);
3125
3126         /*
3127          * enable delayed allocation by default
3128          * Use -o nodelalloc to turn it off
3129          */
3130         if (!IS_EXT3_SB(sb) &&
3131             ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0))
3132                 set_opt(sbi->s_mount_opt, DELALLOC);
3133
3134         if (!parse_options((char *) sbi->s_es->s_mount_opts, sb,
3135                            &journal_devnum, &journal_ioprio, NULL, 0)) {
3136                 ext4_msg(sb, KERN_WARNING,
3137                          "failed to parse options in superblock: %s",
3138                          sbi->s_es->s_mount_opts);
3139         }
3140         if (!parse_options((char *) data, sb, &journal_devnum,
3141                            &journal_ioprio, NULL, 0))
3142                 goto failed_mount;
3143
3144         sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
3145                 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
3146
3147         if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
3148             (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
3149              EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
3150              EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
3151                 ext4_msg(sb, KERN_WARNING,
3152                        "feature flags set on rev 0 fs, "
3153                        "running e2fsck is recommended");
3154
3155         /*
3156          * Check feature flags regardless of the revision level, since we
3157          * previously didn't change the revision level when setting the flags,
3158          * so there is a chance incompat flags are set on a rev 0 filesystem.
3159          */
3160         if (!ext4_feature_set_ok(sb, (sb->s_flags & MS_RDONLY)))
3161                 goto failed_mount;
3162
3163         blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
3164
3165         if (blocksize < EXT4_MIN_BLOCK_SIZE ||
3166             blocksize > EXT4_MAX_BLOCK_SIZE) {
3167                 ext4_msg(sb, KERN_ERR,
3168                        "Unsupported filesystem blocksize %d", blocksize);
3169                 goto failed_mount;