ee91e29ddf95fe6be78ddaa917b1fb418ef9e9bb
[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 void ext4_destroy_inode(struct inode *inode)
837 {
838         ext4_ioend_wait(inode);
839         if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
840                 ext4_msg(inode->i_sb, KERN_ERR,
841                          "Inode %lu (%p): orphan list check failed!",
842                          inode->i_ino, EXT4_I(inode));
843                 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
844                                 EXT4_I(inode), sizeof(struct ext4_inode_info),
845                                 true);
846                 dump_stack();
847         }
848         kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
849 }
850
851 static void init_once(void *foo)
852 {
853         struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
854
855         INIT_LIST_HEAD(&ei->i_orphan);
856 #ifdef CONFIG_EXT4_FS_XATTR
857         init_rwsem(&ei->xattr_sem);
858 #endif
859         init_rwsem(&ei->i_data_sem);
860         inode_init_once(&ei->vfs_inode);
861 }
862
863 static int init_inodecache(void)
864 {
865         ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
866                                              sizeof(struct ext4_inode_info),
867                                              0, (SLAB_RECLAIM_ACCOUNT|
868                                                 SLAB_MEM_SPREAD),
869                                              init_once);
870         if (ext4_inode_cachep == NULL)
871                 return -ENOMEM;
872         return 0;
873 }
874
875 static void destroy_inodecache(void)
876 {
877         kmem_cache_destroy(ext4_inode_cachep);
878 }
879
880 void ext4_clear_inode(struct inode *inode)
881 {
882         invalidate_inode_buffers(inode);
883         end_writeback(inode);
884         dquot_drop(inode);
885         ext4_discard_preallocations(inode);
886         if (EXT4_JOURNAL(inode))
887                 jbd2_journal_release_jbd_inode(EXT4_SB(inode->i_sb)->s_journal,
888                                        &EXT4_I(inode)->jinode);
889 }
890
891 static inline void ext4_show_quota_options(struct seq_file *seq,
892                                            struct super_block *sb)
893 {
894 #if defined(CONFIG_QUOTA)
895         struct ext4_sb_info *sbi = EXT4_SB(sb);
896
897         if (sbi->s_jquota_fmt) {
898                 char *fmtname = "";
899
900                 switch (sbi->s_jquota_fmt) {
901                 case QFMT_VFS_OLD:
902                         fmtname = "vfsold";
903                         break;
904                 case QFMT_VFS_V0:
905                         fmtname = "vfsv0";
906                         break;
907                 case QFMT_VFS_V1:
908                         fmtname = "vfsv1";
909                         break;
910                 }
911                 seq_printf(seq, ",jqfmt=%s", fmtname);
912         }
913
914         if (sbi->s_qf_names[USRQUOTA])
915                 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
916
917         if (sbi->s_qf_names[GRPQUOTA])
918                 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
919
920         if (test_opt(sb, USRQUOTA))
921                 seq_puts(seq, ",usrquota");
922
923         if (test_opt(sb, GRPQUOTA))
924                 seq_puts(seq, ",grpquota");
925 #endif
926 }
927
928 /*
929  * Show an option if
930  *  - it's set to a non-default value OR
931  *  - if the per-sb default is different from the global default
932  */
933 static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs)
934 {
935         int def_errors;
936         unsigned long def_mount_opts;
937         struct super_block *sb = vfs->mnt_sb;
938         struct ext4_sb_info *sbi = EXT4_SB(sb);
939         struct ext4_super_block *es = sbi->s_es;
940
941         def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
942         def_errors     = le16_to_cpu(es->s_errors);
943
944         if (sbi->s_sb_block != 1)
945                 seq_printf(seq, ",sb=%llu", sbi->s_sb_block);
946         if (test_opt(sb, MINIX_DF))
947                 seq_puts(seq, ",minixdf");
948         if (test_opt(sb, GRPID) && !(def_mount_opts & EXT4_DEFM_BSDGROUPS))
949                 seq_puts(seq, ",grpid");
950         if (!test_opt(sb, GRPID) && (def_mount_opts & EXT4_DEFM_BSDGROUPS))
951                 seq_puts(seq, ",nogrpid");
952         if (sbi->s_resuid != EXT4_DEF_RESUID ||
953             le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID) {
954                 seq_printf(seq, ",resuid=%u", sbi->s_resuid);
955         }
956         if (sbi->s_resgid != EXT4_DEF_RESGID ||
957             le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID) {
958                 seq_printf(seq, ",resgid=%u", sbi->s_resgid);
959         }
960         if (test_opt(sb, ERRORS_RO)) {
961                 if (def_errors == EXT4_ERRORS_PANIC ||
962                     def_errors == EXT4_ERRORS_CONTINUE) {
963                         seq_puts(seq, ",errors=remount-ro");
964                 }
965         }
966         if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
967                 seq_puts(seq, ",errors=continue");
968         if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
969                 seq_puts(seq, ",errors=panic");
970         if (test_opt(sb, NO_UID32) && !(def_mount_opts & EXT4_DEFM_UID16))
971                 seq_puts(seq, ",nouid32");
972         if (test_opt(sb, DEBUG) && !(def_mount_opts & EXT4_DEFM_DEBUG))
973                 seq_puts(seq, ",debug");
974         if (test_opt(sb, OLDALLOC))
975                 seq_puts(seq, ",oldalloc");
976 #ifdef CONFIG_EXT4_FS_XATTR
977         if (test_opt(sb, XATTR_USER) &&
978                 !(def_mount_opts & EXT4_DEFM_XATTR_USER))
979                 seq_puts(seq, ",user_xattr");
980         if (!test_opt(sb, XATTR_USER) &&
981             (def_mount_opts & EXT4_DEFM_XATTR_USER)) {
982                 seq_puts(seq, ",nouser_xattr");
983         }
984 #endif
985 #ifdef CONFIG_EXT4_FS_POSIX_ACL
986         if (test_opt(sb, POSIX_ACL) && !(def_mount_opts & EXT4_DEFM_ACL))
987                 seq_puts(seq, ",acl");
988         if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT4_DEFM_ACL))
989                 seq_puts(seq, ",noacl");
990 #endif
991         if (sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) {
992                 seq_printf(seq, ",commit=%u",
993                            (unsigned) (sbi->s_commit_interval / HZ));
994         }
995         if (sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME) {
996                 seq_printf(seq, ",min_batch_time=%u",
997                            (unsigned) sbi->s_min_batch_time);
998         }
999         if (sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME) {
1000                 seq_printf(seq, ",max_batch_time=%u",
1001                            (unsigned) sbi->s_min_batch_time);
1002         }
1003
1004         /*
1005          * We're changing the default of barrier mount option, so
1006          * let's always display its mount state so it's clear what its
1007          * status is.
1008          */
1009         seq_puts(seq, ",barrier=");
1010         seq_puts(seq, test_opt(sb, BARRIER) ? "1" : "0");
1011         if (test_opt(sb, JOURNAL_ASYNC_COMMIT))
1012                 seq_puts(seq, ",journal_async_commit");
1013         else if (test_opt(sb, JOURNAL_CHECKSUM))
1014                 seq_puts(seq, ",journal_checksum");
1015         if (test_opt(sb, I_VERSION))
1016                 seq_puts(seq, ",i_version");
1017         if (!test_opt(sb, DELALLOC) &&
1018             !(def_mount_opts & EXT4_DEFM_NODELALLOC))
1019                 seq_puts(seq, ",nodelalloc");
1020
1021         if (sbi->s_stripe)
1022                 seq_printf(seq, ",stripe=%lu", sbi->s_stripe);
1023         /*
1024          * journal mode get enabled in different ways
1025          * So just print the value even if we didn't specify it
1026          */
1027         if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
1028                 seq_puts(seq, ",data=journal");
1029         else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
1030                 seq_puts(seq, ",data=ordered");
1031         else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
1032                 seq_puts(seq, ",data=writeback");
1033
1034         if (sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
1035                 seq_printf(seq, ",inode_readahead_blks=%u",
1036                            sbi->s_inode_readahead_blks);
1037
1038         if (test_opt(sb, DATA_ERR_ABORT))
1039                 seq_puts(seq, ",data_err=abort");
1040
1041         if (test_opt(sb, NO_AUTO_DA_ALLOC))
1042                 seq_puts(seq, ",noauto_da_alloc");
1043
1044         if (test_opt(sb, DISCARD) && !(def_mount_opts & EXT4_DEFM_DISCARD))
1045                 seq_puts(seq, ",discard");
1046
1047         if (test_opt(sb, NOLOAD))
1048                 seq_puts(seq, ",norecovery");
1049
1050         if (test_opt(sb, DIOREAD_NOLOCK))
1051                 seq_puts(seq, ",dioread_nolock");
1052
1053         if (test_opt(sb, BLOCK_VALIDITY) &&
1054             !(def_mount_opts & EXT4_DEFM_BLOCK_VALIDITY))
1055                 seq_puts(seq, ",block_validity");
1056
1057         if (!test_opt(sb, INIT_INODE_TABLE))
1058                 seq_puts(seq, ",noinit_inode_table");
1059         else if (sbi->s_li_wait_mult)
1060                 seq_printf(seq, ",init_inode_table=%u",
1061                            (unsigned) sbi->s_li_wait_mult);
1062
1063         ext4_show_quota_options(seq, sb);
1064
1065         return 0;
1066 }
1067
1068 static struct inode *ext4_nfs_get_inode(struct super_block *sb,
1069                                         u64 ino, u32 generation)
1070 {
1071         struct inode *inode;
1072
1073         if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
1074                 return ERR_PTR(-ESTALE);
1075         if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
1076                 return ERR_PTR(-ESTALE);
1077
1078         /* iget isn't really right if the inode is currently unallocated!!
1079          *
1080          * ext4_read_inode will return a bad_inode if the inode had been
1081          * deleted, so we should be safe.
1082          *
1083          * Currently we don't know the generation for parent directory, so
1084          * a generation of 0 means "accept any"
1085          */
1086         inode = ext4_iget(sb, ino);
1087         if (IS_ERR(inode))
1088                 return ERR_CAST(inode);
1089         if (generation && inode->i_generation != generation) {
1090                 iput(inode);
1091                 return ERR_PTR(-ESTALE);
1092         }
1093
1094         return inode;
1095 }
1096
1097 static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
1098                                         int fh_len, int fh_type)
1099 {
1100         return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
1101                                     ext4_nfs_get_inode);
1102 }
1103
1104 static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
1105                                         int fh_len, int fh_type)
1106 {
1107         return generic_fh_to_parent(sb, fid, fh_len, fh_type,
1108                                     ext4_nfs_get_inode);
1109 }
1110
1111 /*
1112  * Try to release metadata pages (indirect blocks, directories) which are
1113  * mapped via the block device.  Since these pages could have journal heads
1114  * which would prevent try_to_free_buffers() from freeing them, we must use
1115  * jbd2 layer's try_to_free_buffers() function to release them.
1116  */
1117 static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
1118                                  gfp_t wait)
1119 {
1120         journal_t *journal = EXT4_SB(sb)->s_journal;
1121
1122         WARN_ON(PageChecked(page));
1123         if (!page_has_buffers(page))
1124                 return 0;
1125         if (journal)
1126                 return jbd2_journal_try_to_free_buffers(journal, page,
1127                                                         wait & ~__GFP_WAIT);
1128         return try_to_free_buffers(page);
1129 }
1130
1131 #ifdef CONFIG_QUOTA
1132 #define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
1133 #define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
1134
1135 static int ext4_write_dquot(struct dquot *dquot);
1136 static int ext4_acquire_dquot(struct dquot *dquot);
1137 static int ext4_release_dquot(struct dquot *dquot);
1138 static int ext4_mark_dquot_dirty(struct dquot *dquot);
1139 static int ext4_write_info(struct super_block *sb, int type);
1140 static int ext4_quota_on(struct super_block *sb, int type, int format_id,
1141                                 char *path);
1142 static int ext4_quota_off(struct super_block *sb, int type);
1143 static int ext4_quota_on_mount(struct super_block *sb, int type);
1144 static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
1145                                size_t len, loff_t off);
1146 static ssize_t ext4_quota_write(struct super_block *sb, int type,
1147                                 const char *data, size_t len, loff_t off);
1148
1149 static const struct dquot_operations ext4_quota_operations = {
1150 #ifdef CONFIG_QUOTA
1151         .get_reserved_space = ext4_get_reserved_space,
1152 #endif
1153         .write_dquot    = ext4_write_dquot,
1154         .acquire_dquot  = ext4_acquire_dquot,
1155         .release_dquot  = ext4_release_dquot,
1156         .mark_dirty     = ext4_mark_dquot_dirty,
1157         .write_info     = ext4_write_info,
1158         .alloc_dquot    = dquot_alloc,
1159         .destroy_dquot  = dquot_destroy,
1160 };
1161
1162 static const struct quotactl_ops ext4_qctl_operations = {
1163         .quota_on       = ext4_quota_on,
1164         .quota_off      = ext4_quota_off,
1165         .quota_sync     = dquot_quota_sync,
1166         .get_info       = dquot_get_dqinfo,
1167         .set_info       = dquot_set_dqinfo,
1168         .get_dqblk      = dquot_get_dqblk,
1169         .set_dqblk      = dquot_set_dqblk
1170 };
1171 #endif
1172
1173 static const struct super_operations ext4_sops = {
1174         .alloc_inode    = ext4_alloc_inode,
1175         .destroy_inode  = ext4_destroy_inode,
1176         .write_inode    = ext4_write_inode,
1177         .dirty_inode    = ext4_dirty_inode,
1178         .evict_inode    = ext4_evict_inode,
1179         .put_super      = ext4_put_super,
1180         .sync_fs        = ext4_sync_fs,
1181         .freeze_fs      = ext4_freeze,
1182         .unfreeze_fs    = ext4_unfreeze,
1183         .statfs         = ext4_statfs,
1184         .remount_fs     = ext4_remount,
1185         .show_options   = ext4_show_options,
1186 #ifdef CONFIG_QUOTA
1187         .quota_read     = ext4_quota_read,
1188         .quota_write    = ext4_quota_write,
1189 #endif
1190         .bdev_try_to_free_page = bdev_try_to_free_page,
1191         .trim_fs        = ext4_trim_fs
1192 };
1193
1194 static const struct super_operations ext4_nojournal_sops = {
1195         .alloc_inode    = ext4_alloc_inode,
1196         .destroy_inode  = ext4_destroy_inode,
1197         .write_inode    = ext4_write_inode,
1198         .dirty_inode    = ext4_dirty_inode,
1199         .evict_inode    = ext4_evict_inode,
1200         .write_super    = ext4_write_super,
1201         .put_super      = ext4_put_super,
1202         .statfs         = ext4_statfs,
1203         .remount_fs     = ext4_remount,
1204         .show_options   = ext4_show_options,
1205 #ifdef CONFIG_QUOTA
1206         .quota_read     = ext4_quota_read,
1207         .quota_write    = ext4_quota_write,
1208 #endif
1209         .bdev_try_to_free_page = bdev_try_to_free_page,
1210 };
1211
1212 static const struct export_operations ext4_export_ops = {
1213         .fh_to_dentry = ext4_fh_to_dentry,
1214         .fh_to_parent = ext4_fh_to_parent,
1215         .get_parent = ext4_get_parent,
1216 };
1217
1218 enum {
1219         Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
1220         Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
1221         Opt_nouid32, Opt_debug, Opt_oldalloc, Opt_orlov,
1222         Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
1223         Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload, Opt_nobh, Opt_bh,
1224         Opt_commit, Opt_min_batch_time, Opt_max_batch_time,
1225         Opt_journal_update, Opt_journal_dev,
1226         Opt_journal_checksum, Opt_journal_async_commit,
1227         Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
1228         Opt_data_err_abort, Opt_data_err_ignore,
1229         Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
1230         Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
1231         Opt_noquota, Opt_ignore, Opt_barrier, Opt_nobarrier, Opt_err,
1232         Opt_resize, Opt_usrquota, Opt_grpquota, Opt_i_version,
1233         Opt_stripe, Opt_delalloc, Opt_nodelalloc,
1234         Opt_block_validity, Opt_noblock_validity,
1235         Opt_inode_readahead_blks, Opt_journal_ioprio,
1236         Opt_dioread_nolock, Opt_dioread_lock,
1237         Opt_discard, Opt_nodiscard,
1238         Opt_init_inode_table, Opt_noinit_inode_table,
1239 };
1240
1241 static const match_table_t tokens = {
1242         {Opt_bsd_df, "bsddf"},
1243         {Opt_minix_df, "minixdf"},
1244         {Opt_grpid, "grpid"},
1245         {Opt_grpid, "bsdgroups"},
1246         {Opt_nogrpid, "nogrpid"},
1247         {Opt_nogrpid, "sysvgroups"},
1248         {Opt_resgid, "resgid=%u"},
1249         {Opt_resuid, "resuid=%u"},
1250         {Opt_sb, "sb=%u"},
1251         {Opt_err_cont, "errors=continue"},
1252         {Opt_err_panic, "errors=panic"},
1253         {Opt_err_ro, "errors=remount-ro"},
1254         {Opt_nouid32, "nouid32"},
1255         {Opt_debug, "debug"},
1256         {Opt_oldalloc, "oldalloc"},
1257         {Opt_orlov, "orlov"},
1258         {Opt_user_xattr, "user_xattr"},
1259         {Opt_nouser_xattr, "nouser_xattr"},
1260         {Opt_acl, "acl"},
1261         {Opt_noacl, "noacl"},
1262         {Opt_noload, "noload"},
1263         {Opt_noload, "norecovery"},
1264         {Opt_nobh, "nobh"},
1265         {Opt_bh, "bh"},
1266         {Opt_commit, "commit=%u"},
1267         {Opt_min_batch_time, "min_batch_time=%u"},
1268         {Opt_max_batch_time, "max_batch_time=%u"},
1269         {Opt_journal_update, "journal=update"},
1270         {Opt_journal_dev, "journal_dev=%u"},
1271         {Opt_journal_checksum, "journal_checksum"},
1272         {Opt_journal_async_commit, "journal_async_commit"},
1273         {Opt_abort, "abort"},
1274         {Opt_data_journal, "data=journal"},
1275         {Opt_data_ordered, "data=ordered"},
1276         {Opt_data_writeback, "data=writeback"},
1277         {Opt_data_err_abort, "data_err=abort"},
1278         {Opt_data_err_ignore, "data_err=ignore"},
1279         {Opt_offusrjquota, "usrjquota="},
1280         {Opt_usrjquota, "usrjquota=%s"},
1281         {Opt_offgrpjquota, "grpjquota="},
1282         {Opt_grpjquota, "grpjquota=%s"},
1283         {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
1284         {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
1285         {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
1286         {Opt_grpquota, "grpquota"},
1287         {Opt_noquota, "noquota"},
1288         {Opt_quota, "quota"},
1289         {Opt_usrquota, "usrquota"},
1290         {Opt_barrier, "barrier=%u"},
1291         {Opt_barrier, "barrier"},
1292         {Opt_nobarrier, "nobarrier"},
1293         {Opt_i_version, "i_version"},
1294         {Opt_stripe, "stripe=%u"},
1295         {Opt_resize, "resize"},
1296         {Opt_delalloc, "delalloc"},
1297         {Opt_nodelalloc, "nodelalloc"},
1298         {Opt_block_validity, "block_validity"},
1299         {Opt_noblock_validity, "noblock_validity"},
1300         {Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
1301         {Opt_journal_ioprio, "journal_ioprio=%u"},
1302         {Opt_auto_da_alloc, "auto_da_alloc=%u"},
1303         {Opt_auto_da_alloc, "auto_da_alloc"},
1304         {Opt_noauto_da_alloc, "noauto_da_alloc"},
1305         {Opt_dioread_nolock, "dioread_nolock"},
1306         {Opt_dioread_lock, "dioread_lock"},
1307         {Opt_discard, "discard"},
1308         {Opt_nodiscard, "nodiscard"},
1309         {Opt_init_inode_table, "init_itable=%u"},
1310         {Opt_init_inode_table, "init_itable"},
1311         {Opt_noinit_inode_table, "noinit_itable"},
1312         {Opt_err, NULL},
1313 };
1314
1315 static ext4_fsblk_t get_sb_block(void **data)
1316 {
1317         ext4_fsblk_t    sb_block;
1318         char            *options = (char *) *data;
1319
1320         if (!options || strncmp(options, "sb=", 3) != 0)
1321                 return 1;       /* Default location */
1322
1323         options += 3;
1324         /* TODO: use simple_strtoll with >32bit ext4 */
1325         sb_block = simple_strtoul(options, &options, 0);
1326         if (*options && *options != ',') {
1327                 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
1328                        (char *) *data);
1329                 return 1;
1330         }
1331         if (*options == ',')
1332                 options++;
1333         *data = (void *) options;
1334
1335         return sb_block;
1336 }
1337
1338 #define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
1339 static char deprecated_msg[] = "Mount option \"%s\" will be removed by %s\n"
1340         "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
1341
1342 #ifdef CONFIG_QUOTA
1343 static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
1344 {
1345         struct ext4_sb_info *sbi = EXT4_SB(sb);
1346         char *qname;
1347
1348         if (sb_any_quota_loaded(sb) &&
1349                 !sbi->s_qf_names[qtype]) {
1350                 ext4_msg(sb, KERN_ERR,
1351                         "Cannot change journaled "
1352                         "quota options when quota turned on");
1353                 return 0;
1354         }
1355         qname = match_strdup(args);
1356         if (!qname) {
1357                 ext4_msg(sb, KERN_ERR,
1358                         "Not enough memory for storing quotafile name");
1359                 return 0;
1360         }
1361         if (sbi->s_qf_names[qtype] &&
1362                 strcmp(sbi->s_qf_names[qtype], qname)) {
1363                 ext4_msg(sb, KERN_ERR,
1364                         "%s quota file already specified", QTYPE2NAME(qtype));
1365                 kfree(qname);
1366                 return 0;
1367         }
1368         sbi->s_qf_names[qtype] = qname;
1369         if (strchr(sbi->s_qf_names[qtype], '/')) {
1370                 ext4_msg(sb, KERN_ERR,
1371                         "quotafile must be on filesystem root");
1372                 kfree(sbi->s_qf_names[qtype]);
1373                 sbi->s_qf_names[qtype] = NULL;
1374                 return 0;
1375         }
1376         set_opt(sbi->s_mount_opt, QUOTA);
1377         return 1;
1378 }
1379
1380 static int clear_qf_name(struct super_block *sb, int qtype)
1381 {
1382
1383         struct ext4_sb_info *sbi = EXT4_SB(sb);
1384
1385         if (sb_any_quota_loaded(sb) &&
1386                 sbi->s_qf_names[qtype]) {
1387                 ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options"
1388                         " when quota turned on");
1389                 return 0;
1390         }
1391         /*
1392          * The space will be released later when all options are confirmed
1393          * to be correct
1394          */
1395         sbi->s_qf_names[qtype] = NULL;
1396         return 1;
1397 }
1398 #endif
1399
1400 static int parse_options(char *options, struct super_block *sb,
1401                          unsigned long *journal_devnum,
1402                          unsigned int *journal_ioprio,
1403                          ext4_fsblk_t *n_blocks_count, int is_remount)
1404 {
1405         struct ext4_sb_info *sbi = EXT4_SB(sb);
1406         char *p;
1407         substring_t args[MAX_OPT_ARGS];
1408         int data_opt = 0;
1409         int option;
1410 #ifdef CONFIG_QUOTA
1411         int qfmt;
1412 #endif
1413
1414         if (!options)
1415                 return 1;
1416
1417         while ((p = strsep(&options, ",")) != NULL) {
1418                 int token;
1419                 if (!*p)
1420                         continue;
1421
1422                 /*
1423                  * Initialize args struct so we know whether arg was
1424                  * found; some options take optional arguments.
1425                  */
1426                 args[0].to = args[0].from = 0;
1427                 token = match_token(p, tokens, args);
1428                 switch (token) {
1429                 case Opt_bsd_df:
1430                         ext4_msg(sb, KERN_WARNING, deprecated_msg, p, "2.6.38");
1431                         clear_opt(sbi->s_mount_opt, MINIX_DF);
1432                         break;
1433                 case Opt_minix_df:
1434                         ext4_msg(sb, KERN_WARNING, deprecated_msg, p, "2.6.38");
1435                         set_opt(sbi->s_mount_opt, MINIX_DF);
1436
1437                         break;
1438                 case Opt_grpid:
1439                         ext4_msg(sb, KERN_WARNING, deprecated_msg, p, "2.6.38");
1440                         set_opt(sbi->s_mount_opt, GRPID);
1441
1442                         break;
1443                 case Opt_nogrpid:
1444                         ext4_msg(sb, KERN_WARNING, deprecated_msg, p, "2.6.38");
1445                         clear_opt(sbi->s_mount_opt, GRPID);
1446
1447                         break;
1448                 case Opt_resuid:
1449                         if (match_int(&args[0], &option))
1450                                 return 0;
1451                         sbi->s_resuid = option;
1452                         break;
1453                 case Opt_resgid:
1454                         if (match_int(&args[0], &option))
1455                                 return 0;
1456                         sbi->s_resgid = option;
1457                         break;
1458                 case Opt_sb:
1459                         /* handled by get_sb_block() instead of here */
1460                         /* *sb_block = match_int(&args[0]); */
1461                         break;
1462                 case Opt_err_panic:
1463                         clear_opt(sbi->s_mount_opt, ERRORS_CONT);
1464                         clear_opt(sbi->s_mount_opt, ERRORS_RO);
1465                         set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1466                         break;
1467                 case Opt_err_ro:
1468                         clear_opt(sbi->s_mount_opt, ERRORS_CONT);
1469                         clear_opt(sbi->s_mount_opt, ERRORS_PANIC);
1470                         set_opt(sbi->s_mount_opt, ERRORS_RO);
1471                         break;
1472                 case Opt_err_cont:
1473                         clear_opt(sbi->s_mount_opt, ERRORS_RO);
1474                         clear_opt(sbi->s_mount_opt, ERRORS_PANIC);
1475                         set_opt(sbi->s_mount_opt, ERRORS_CONT);
1476                         break;
1477                 case Opt_nouid32:
1478                         set_opt(sbi->s_mount_opt, NO_UID32);
1479                         break;
1480                 case Opt_debug:
1481                         set_opt(sbi->s_mount_opt, DEBUG);
1482                         break;
1483                 case Opt_oldalloc:
1484                         set_opt(sbi->s_mount_opt, OLDALLOC);
1485                         break;
1486                 case Opt_orlov:
1487                         clear_opt(sbi->s_mount_opt, OLDALLOC);
1488                         break;
1489 #ifdef CONFIG_EXT4_FS_XATTR
1490                 case Opt_user_xattr:
1491                         set_opt(sbi->s_mount_opt, XATTR_USER);
1492                         break;
1493                 case Opt_nouser_xattr:
1494                         clear_opt(sbi->s_mount_opt, XATTR_USER);
1495                         break;
1496 #else
1497                 case Opt_user_xattr:
1498                 case Opt_nouser_xattr:
1499                         ext4_msg(sb, KERN_ERR, "(no)user_xattr options not supported");
1500                         break;
1501 #endif
1502 #ifdef CONFIG_EXT4_FS_POSIX_ACL
1503                 case Opt_acl:
1504                         set_opt(sbi->s_mount_opt, POSIX_ACL);
1505                         break;
1506                 case Opt_noacl:
1507                         clear_opt(sbi->s_mount_opt, POSIX_ACL);
1508                         break;
1509 #else
1510                 case Opt_acl:
1511                 case Opt_noacl:
1512                         ext4_msg(sb, KERN_ERR, "(no)acl options not supported");
1513                         break;
1514 #endif
1515                 case Opt_journal_update:
1516                         /* @@@ FIXME */
1517                         /* Eventually we will want to be able to create
1518                            a journal file here.  For now, only allow the
1519                            user to specify an existing inode to be the
1520                            journal file. */
1521                         if (is_remount) {
1522                                 ext4_msg(sb, KERN_ERR,
1523                                          "Cannot specify journal on remount");
1524                                 return 0;
1525                         }
1526                         set_opt(sbi->s_mount_opt, UPDATE_JOURNAL);
1527                         break;
1528                 case Opt_journal_dev:
1529                         if (is_remount) {
1530                                 ext4_msg(sb, KERN_ERR,
1531                                         "Cannot specify journal on remount");
1532                                 return 0;
1533                         }
1534                         if (match_int(&args[0], &option))
1535                                 return 0;
1536                         *journal_devnum = option;
1537                         break;
1538                 case Opt_journal_checksum:
1539                         set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM);
1540                         break;
1541                 case Opt_journal_async_commit:
1542                         set_opt(sbi->s_mount_opt, JOURNAL_ASYNC_COMMIT);
1543                         set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM);
1544                         break;
1545                 case Opt_noload:
1546                         set_opt(sbi->s_mount_opt, NOLOAD);
1547                         break;
1548                 case Opt_commit:
1549                         if (match_int(&args[0], &option))
1550                                 return 0;
1551                         if (option < 0)
1552                                 return 0;
1553                         if (option == 0)
1554                                 option = JBD2_DEFAULT_MAX_COMMIT_AGE;
1555                         sbi->s_commit_interval = HZ * option;
1556                         break;
1557                 case Opt_max_batch_time:
1558                         if (match_int(&args[0], &option))
1559                                 return 0;
1560                         if (option < 0)
1561                                 return 0;
1562                         if (option == 0)
1563                                 option = EXT4_DEF_MAX_BATCH_TIME;
1564                         sbi->s_max_batch_time = option;
1565                         break;
1566                 case Opt_min_batch_time:
1567                         if (match_int(&args[0], &option))
1568                                 return 0;
1569                         if (option < 0)
1570                                 return 0;
1571                         sbi->s_min_batch_time = option;
1572                         break;
1573                 case Opt_data_journal:
1574                         data_opt = EXT4_MOUNT_JOURNAL_DATA;
1575                         goto datacheck;
1576                 case Opt_data_ordered:
1577                         data_opt = EXT4_MOUNT_ORDERED_DATA;
1578                         goto datacheck;
1579                 case Opt_data_writeback:
1580                         data_opt = EXT4_MOUNT_WRITEBACK_DATA;
1581                 datacheck:
1582                         if (is_remount) {
1583                                 if (test_opt(sb, DATA_FLAGS) != data_opt) {
1584                                         ext4_msg(sb, KERN_ERR,
1585                                                 "Cannot change data mode on remount");
1586                                         return 0;
1587                                 }
1588                         } else {
1589                                 clear_opt(sbi->s_mount_opt, DATA_FLAGS);
1590                                 sbi->s_mount_opt |= data_opt;
1591                         }
1592                         break;
1593                 case Opt_data_err_abort:
1594                         set_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1595                         break;
1596                 case Opt_data_err_ignore:
1597                         clear_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1598                         break;
1599 #ifdef CONFIG_QUOTA
1600                 case Opt_usrjquota:
1601                         if (!set_qf_name(sb, USRQUOTA, &args[0]))
1602                                 return 0;
1603                         break;
1604                 case Opt_grpjquota:
1605                         if (!set_qf_name(sb, GRPQUOTA, &args[0]))
1606                                 return 0;
1607                         break;
1608                 case Opt_offusrjquota:
1609                         if (!clear_qf_name(sb, USRQUOTA))
1610                                 return 0;
1611                         break;
1612                 case Opt_offgrpjquota:
1613                         if (!clear_qf_name(sb, GRPQUOTA))
1614                                 return 0;
1615                         break;
1616
1617                 case Opt_jqfmt_vfsold:
1618                         qfmt = QFMT_VFS_OLD;
1619                         goto set_qf_format;
1620                 case Opt_jqfmt_vfsv0:
1621                         qfmt = QFMT_VFS_V0;
1622                         goto set_qf_format;
1623                 case Opt_jqfmt_vfsv1:
1624                         qfmt = QFMT_VFS_V1;
1625 set_qf_format:
1626                         if (sb_any_quota_loaded(sb) &&
1627                             sbi->s_jquota_fmt != qfmt) {
1628                                 ext4_msg(sb, KERN_ERR, "Cannot change "
1629                                         "journaled quota options when "
1630                                         "quota turned on");
1631                                 return 0;
1632                         }
1633                         sbi->s_jquota_fmt = qfmt;
1634                         break;
1635                 case Opt_quota:
1636                 case Opt_usrquota:
1637                         set_opt(sbi->s_mount_opt, QUOTA);
1638                         set_opt(sbi->s_mount_opt, USRQUOTA);
1639                         break;
1640                 case Opt_grpquota:
1641                         set_opt(sbi->s_mount_opt, QUOTA);
1642                         set_opt(sbi->s_mount_opt, GRPQUOTA);
1643                         break;
1644                 case Opt_noquota:
1645                         if (sb_any_quota_loaded(sb)) {
1646                                 ext4_msg(sb, KERN_ERR, "Cannot change quota "
1647                                         "options when quota turned on");
1648                                 return 0;
1649                         }
1650                         clear_opt(sbi->s_mount_opt, QUOTA);
1651                         clear_opt(sbi->s_mount_opt, USRQUOTA);
1652                         clear_opt(sbi->s_mount_opt, GRPQUOTA);
1653                         break;
1654 #else
1655                 case Opt_quota:
1656                 case Opt_usrquota:
1657                 case Opt_grpquota:
1658                         ext4_msg(sb, KERN_ERR,
1659                                 "quota options not supported");
1660                         break;
1661                 case Opt_usrjquota:
1662                 case Opt_grpjquota:
1663                 case Opt_offusrjquota:
1664                 case Opt_offgrpjquota:
1665                 case Opt_jqfmt_vfsold:
1666                 case Opt_jqfmt_vfsv0:
1667                 case Opt_jqfmt_vfsv1:
1668                         ext4_msg(sb, KERN_ERR,
1669                                 "journaled quota options not supported");
1670                         break;
1671                 case Opt_noquota:
1672                         break;
1673 #endif
1674                 case Opt_abort:
1675                         sbi->s_mount_flags |= EXT4_MF_FS_ABORTED;
1676                         break;
1677                 case Opt_nobarrier:
1678                         clear_opt(sbi->s_mount_opt, BARRIER);
1679                         break;
1680                 case Opt_barrier:
1681                         if (args[0].from) {
1682                                 if (match_int(&args[0], &option))
1683                                         return 0;
1684                         } else
1685                                 option = 1;     /* No argument, default to 1 */
1686                         if (option)
1687                                 set_opt(sbi->s_mount_opt, BARRIER);
1688                         else
1689                                 clear_opt(sbi->s_mount_opt, BARRIER);
1690                         break;
1691                 case Opt_ignore:
1692                         break;
1693                 case Opt_resize:
1694                         if (!is_remount) {
1695                                 ext4_msg(sb, KERN_ERR,
1696                                         "resize option only available "
1697                                         "for remount");
1698                                 return 0;
1699                         }
1700                         if (match_int(&args[0], &option) != 0)
1701                                 return 0;
1702                         *n_blocks_count = option;
1703                         break;
1704                 case Opt_nobh:
1705                         ext4_msg(sb, KERN_WARNING,
1706                                  "Ignoring deprecated nobh option");
1707                         break;
1708                 case Opt_bh:
1709                         ext4_msg(sb, KERN_WARNING,
1710                                  "Ignoring deprecated bh option");
1711                         break;
1712                 case Opt_i_version:
1713                         set_opt(sbi->s_mount_opt, I_VERSION);
1714                         sb->s_flags |= MS_I_VERSION;
1715                         break;
1716                 case Opt_nodelalloc:
1717                         clear_opt(sbi->s_mount_opt, DELALLOC);
1718                         break;
1719                 case Opt_stripe:
1720                         if (match_int(&args[0], &option))
1721                                 return 0;
1722                         if (option < 0)
1723                                 return 0;
1724                         sbi->s_stripe = option;
1725                         break;
1726                 case Opt_delalloc:
1727                         set_opt(sbi->s_mount_opt, DELALLOC);
1728                         break;
1729                 case Opt_block_validity:
1730                         set_opt(sbi->s_mount_opt, BLOCK_VALIDITY);
1731                         break;
1732                 case Opt_noblock_validity:
1733                         clear_opt(sbi->s_mount_opt, BLOCK_VALIDITY);
1734                         break;
1735                 case Opt_inode_readahead_blks:
1736                         if (match_int(&args[0], &option))
1737                                 return 0;
1738                         if (option < 0 || option > (1 << 30))
1739                                 return 0;
1740                         if (!is_power_of_2(option)) {
1741                                 ext4_msg(sb, KERN_ERR,
1742                                          "EXT4-fs: inode_readahead_blks"
1743                                          " must be a power of 2");
1744                                 return 0;
1745                         }
1746                         sbi->s_inode_readahead_blks = option;
1747                         break;
1748                 case Opt_journal_ioprio:
1749                         if (match_int(&args[0], &option))
1750                                 return 0;
1751                         if (option < 0 || option > 7)
1752                                 break;
1753                         *journal_ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE,
1754                                                             option);
1755                         break;
1756                 case Opt_noauto_da_alloc:
1757                         set_opt(sbi->s_mount_opt,NO_AUTO_DA_ALLOC);
1758                         break;
1759                 case Opt_auto_da_alloc:
1760                         if (args[0].from) {
1761                                 if (match_int(&args[0], &option))
1762                                         return 0;
1763                         } else
1764                                 option = 1;     /* No argument, default to 1 */
1765                         if (option)
1766                                 clear_opt(sbi->s_mount_opt, NO_AUTO_DA_ALLOC);
1767                         else
1768                                 set_opt(sbi->s_mount_opt,NO_AUTO_DA_ALLOC);
1769                         break;
1770                 case Opt_discard:
1771                         set_opt(sbi->s_mount_opt, DISCARD);
1772                         break;
1773                 case Opt_nodiscard:
1774                         clear_opt(sbi->s_mount_opt, DISCARD);
1775                         break;
1776                 case Opt_dioread_nolock:
1777                         set_opt(sbi->s_mount_opt, DIOREAD_NOLOCK);
1778                         break;
1779                 case Opt_dioread_lock:
1780                         clear_opt(sbi->s_mount_opt, DIOREAD_NOLOCK);
1781                         break;
1782                 case Opt_init_inode_table:
1783                         set_opt(sbi->s_mount_opt, INIT_INODE_TABLE);
1784                         if (args[0].from) {
1785                                 if (match_int(&args[0], &option))
1786                                         return 0;
1787                         } else
1788                                 option = EXT4_DEF_LI_WAIT_MULT;
1789                         if (option < 0)
1790                                 return 0;
1791                         sbi->s_li_wait_mult = option;
1792                         break;
1793                 case Opt_noinit_inode_table:
1794                         clear_opt(sbi->s_mount_opt, INIT_INODE_TABLE);
1795                         break;
1796                 default:
1797                         ext4_msg(sb, KERN_ERR,
1798                                "Unrecognized mount option \"%s\" "
1799                                "or missing value", p);
1800                         return 0;
1801                 }
1802         }
1803 #ifdef CONFIG_QUOTA
1804         if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1805                 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
1806                         clear_opt(sbi->s_mount_opt, USRQUOTA);
1807
1808                 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
1809                         clear_opt(sbi->s_mount_opt, GRPQUOTA);
1810
1811                 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
1812                         ext4_msg(sb, KERN_ERR, "old and new quota "
1813                                         "format mixing");
1814                         return 0;
1815                 }
1816
1817                 if (!sbi->s_jquota_fmt) {
1818                         ext4_msg(sb, KERN_ERR, "journaled quota format "
1819                                         "not specified");
1820                         return 0;
1821                 }
1822         } else {
1823                 if (sbi->s_jquota_fmt) {
1824                         ext4_msg(sb, KERN_ERR, "journaled quota format "
1825                                         "specified with no journaling "
1826                                         "enabled");
1827                         return 0;
1828                 }
1829         }
1830 #endif
1831         return 1;
1832 }
1833
1834 static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
1835                             int read_only)
1836 {
1837         struct ext4_sb_info *sbi = EXT4_SB(sb);
1838         int res = 0;
1839
1840         if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
1841                 ext4_msg(sb, KERN_ERR, "revision level too high, "
1842                          "forcing read-only mode");
1843                 res = MS_RDONLY;
1844         }
1845         if (read_only)
1846                 return res;
1847         if (!(sbi->s_mount_state & EXT4_VALID_FS))
1848                 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
1849                          "running e2fsck is recommended");
1850         else if ((sbi->s_mount_state & EXT4_ERROR_FS))
1851                 ext4_msg(sb, KERN_WARNING,
1852                          "warning: mounting fs with errors, "
1853                          "running e2fsck is recommended");
1854         else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
1855                  le16_to_cpu(es->s_mnt_count) >=
1856                  (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
1857                 ext4_msg(sb, KERN_WARNING,
1858                          "warning: maximal mount count reached, "
1859                          "running e2fsck is recommended");
1860         else if (le32_to_cpu(es->s_checkinterval) &&
1861                 (le32_to_cpu(es->s_lastcheck) +
1862                         le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1863                 ext4_msg(sb, KERN_WARNING,
1864                          "warning: checktime reached, "
1865                          "running e2fsck is recommended");
1866         if (!sbi->s_journal)
1867                 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
1868         if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
1869                 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
1870         le16_add_cpu(&es->s_mnt_count, 1);
1871         es->s_mtime = cpu_to_le32(get_seconds());
1872         ext4_update_dynamic_rev(sb);
1873         if (sbi->s_journal)
1874                 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
1875
1876         ext4_commit_super(sb, 1);
1877         if (test_opt(sb, DEBUG))
1878                 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
1879                                 "bpg=%lu, ipg=%lu, mo=%04x]\n",
1880                         sb->s_blocksize,
1881                         sbi->s_groups_count,
1882                         EXT4_BLOCKS_PER_GROUP(sb),
1883                         EXT4_INODES_PER_GROUP(sb),
1884                         sbi->s_mount_opt);
1885
1886         return res;
1887 }
1888
1889 static int ext4_fill_flex_info(struct super_block *sb)
1890 {
1891         struct ext4_sb_info *sbi = EXT4_SB(sb);
1892         struct ext4_group_desc *gdp = NULL;
1893         ext4_group_t flex_group_count;
1894         ext4_group_t flex_group;
1895         int groups_per_flex = 0;
1896         size_t size;
1897         int i;
1898
1899         sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
1900         groups_per_flex = 1 << sbi->s_log_groups_per_flex;
1901
1902         if (groups_per_flex < 2) {
1903                 sbi->s_log_groups_per_flex = 0;
1904                 return 1;
1905         }
1906
1907         /* We allocate both existing and potentially added groups */
1908         flex_group_count = ((sbi->s_groups_count + groups_per_flex - 1) +
1909                         ((le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) + 1) <<
1910                               EXT4_DESC_PER_BLOCK_BITS(sb))) / groups_per_flex;
1911         size = flex_group_count * sizeof(struct flex_groups);
1912         sbi->s_flex_groups = kzalloc(size, GFP_KERNEL);
1913         if (sbi->s_flex_groups == NULL) {
1914                 sbi->s_flex_groups = vmalloc(size);
1915                 if (sbi->s_flex_groups)
1916                         memset(sbi->s_flex_groups, 0, size);
1917         }
1918         if (sbi->s_flex_groups == NULL) {
1919                 ext4_msg(sb, KERN_ERR, "not enough memory for "
1920                                 "%u flex groups", flex_group_count);
1921                 goto failed;
1922         }
1923
1924         for (i = 0; i < sbi->s_groups_count; i++) {
1925                 gdp = ext4_get_group_desc(sb, i, NULL);
1926
1927                 flex_group = ext4_flex_group(sbi, i);
1928                 atomic_add(ext4_free_inodes_count(sb, gdp),
1929                            &sbi->s_flex_groups[flex_group].free_inodes);
1930                 atomic_add(ext4_free_blks_count(sb, gdp),
1931                            &sbi->s_flex_groups[flex_group].free_blocks);
1932                 atomic_add(ext4_used_dirs_count(sb, gdp),
1933                            &sbi->s_flex_groups[flex_group].used_dirs);
1934         }
1935
1936         return 1;
1937 failed:
1938         return 0;
1939 }
1940
1941 __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
1942                             struct ext4_group_desc *gdp)
1943 {
1944         __u16 crc = 0;
1945
1946         if (sbi->s_es->s_feature_ro_compat &
1947             cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) {
1948                 int offset = offsetof(struct ext4_group_desc, bg_checksum);
1949                 __le32 le_group = cpu_to_le32(block_group);
1950
1951                 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
1952                 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
1953                 crc = crc16(crc, (__u8 *)gdp, offset);
1954                 offset += sizeof(gdp->bg_checksum); /* skip checksum */
1955                 /* for checksum of struct ext4_group_desc do the rest...*/
1956                 if ((sbi->s_es->s_feature_incompat &
1957                      cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) &&
1958                     offset < le16_to_cpu(sbi->s_es->s_desc_size))
1959                         crc = crc16(crc, (__u8 *)gdp + offset,
1960                                     le16_to_cpu(sbi->s_es->s_desc_size) -
1961                                         offset);
1962         }
1963
1964         return cpu_to_le16(crc);
1965 }
1966
1967 int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 block_group,
1968                                 struct ext4_group_desc *gdp)
1969 {
1970         if ((sbi->s_es->s_feature_ro_compat &
1971              cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) &&
1972             (gdp->bg_checksum != ext4_group_desc_csum(sbi, block_group, gdp)))
1973                 return 0;
1974
1975         return 1;
1976 }
1977
1978 /* Called at mount-time, super-block is locked */
1979 static int ext4_check_descriptors(struct super_block *sb,
1980                                   ext4_group_t *first_not_zeroed)
1981 {
1982         struct ext4_sb_info *sbi = EXT4_SB(sb);
1983         ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
1984         ext4_fsblk_t last_block;
1985         ext4_fsblk_t block_bitmap;
1986         ext4_fsblk_t inode_bitmap;
1987         ext4_fsblk_t inode_table;
1988         int flexbg_flag = 0;
1989         ext4_group_t i, grp = sbi->s_groups_count;
1990
1991         if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
1992                 flexbg_flag = 1;
1993
1994         ext4_debug("Checking group descriptors");
1995
1996         for (i = 0; i < sbi->s_groups_count; i++) {
1997                 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
1998
1999                 if (i == sbi->s_groups_count - 1 || flexbg_flag)
2000                         last_block = ext4_blocks_count(sbi->s_es) - 1;
2001                 else
2002                         last_block = first_block +
2003                                 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
2004
2005                 if ((grp == sbi->s_groups_count) &&
2006                    !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2007                         grp = i;
2008
2009                 block_bitmap = ext4_block_bitmap(sb, gdp);
2010                 if (block_bitmap < first_block || block_bitmap > last_block) {
2011                         ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2012                                "Block bitmap for group %u not in group "
2013                                "(block %llu)!", i, block_bitmap);
2014                         return 0;
2015                 }
2016                 inode_bitmap = ext4_inode_bitmap(sb, gdp);
2017                 if (inode_bitmap < first_block || inode_bitmap > last_block) {
2018                         ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2019                                "Inode bitmap for group %u not in group "
2020                                "(block %llu)!", i, inode_bitmap);
2021                         return 0;
2022                 }
2023                 inode_table = ext4_inode_table(sb, gdp);
2024                 if (inode_table < first_block ||
2025                     inode_table + sbi->s_itb_per_group - 1 > last_block) {
2026                         ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2027                                "Inode table for group %u not in group "
2028                                "(block %llu)!", i, inode_table);
2029                         return 0;
2030                 }
2031                 ext4_lock_group(sb, i);
2032                 if (!ext4_group_desc_csum_verify(sbi, i, gdp)) {
2033                         ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2034                                  "Checksum for group %u failed (%u!=%u)",
2035                                  i, le16_to_cpu(ext4_group_desc_csum(sbi, i,
2036                                      gdp)), le16_to_cpu(gdp->bg_checksum));
2037                         if (!(sb->s_flags & MS_RDONLY)) {
2038                                 ext4_unlock_group(sb, i);
2039                                 return 0;
2040                         }
2041                 }
2042                 ext4_unlock_group(sb, i);
2043                 if (!flexbg_flag)
2044                         first_block += EXT4_BLOCKS_PER_GROUP(sb);
2045         }
2046         if (NULL != first_not_zeroed)
2047                 *first_not_zeroed = grp;
2048
2049         ext4_free_blocks_count_set(sbi->s_es, ext4_count_free_blocks(sb));
2050         sbi->s_es->s_free_inodes_count =cpu_to_le32(ext4_count_free_inodes(sb));
2051         return 1;
2052 }
2053
2054 /* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
2055  * the superblock) which were deleted from all directories, but held open by
2056  * a process at the time of a crash.  We walk the list and try to delete these
2057  * inodes at recovery time (only with a read-write filesystem).
2058  *
2059  * In order to keep the orphan inode chain consistent during traversal (in
2060  * case of crash during recovery), we link each inode into the superblock
2061  * orphan list_head and handle it the same way as an inode deletion during
2062  * normal operation (which journals the operations for us).
2063  *
2064  * We only do an iget() and an iput() on each inode, which is very safe if we
2065  * accidentally point at an in-use or already deleted inode.  The worst that
2066  * can happen in this case is that we get a "bit already cleared" message from
2067  * ext4_free_inode().  The only reason we would point at a wrong inode is if
2068  * e2fsck was run on this filesystem, and it must have already done the orphan
2069  * inode cleanup for us, so we can safely abort without any further action.
2070  */
2071 static void ext4_orphan_cleanup(struct super_block *sb,
2072                                 struct ext4_super_block *es)
2073 {
2074         unsigned int s_flags = sb->s_flags;
2075         int nr_orphans = 0, nr_truncates = 0;
2076 #ifdef CONFIG_QUOTA
2077         int i;
2078 #endif
2079         if (!es->s_last_orphan) {
2080                 jbd_debug(4, "no orphan inodes to clean up\n");
2081                 return;
2082         }
2083
2084         if (bdev_read_only(sb->s_bdev)) {
2085                 ext4_msg(sb, KERN_ERR, "write access "
2086                         "unavailable, skipping orphan cleanup");
2087                 return;
2088         }
2089
2090         if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
2091                 if (es->s_last_orphan)
2092                         jbd_debug(1, "Errors on filesystem, "
2093                                   "clearing orphan list.\n");
2094                 es->s_last_orphan = 0;
2095                 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2096                 return;
2097         }
2098
2099         if (s_flags & MS_RDONLY) {
2100                 ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
2101                 sb->s_flags &= ~MS_RDONLY;
2102         }
2103 #ifdef CONFIG_QUOTA
2104         /* Needed for iput() to work correctly and not trash data */
2105         sb->s_flags |= MS_ACTIVE;
2106         /* Turn on quotas so that they are updated correctly */
2107         for (i = 0; i < MAXQUOTAS; i++) {
2108                 if (EXT4_SB(sb)->s_qf_names[i]) {
2109                         int ret = ext4_quota_on_mount(sb, i);
2110                         if (ret < 0)
2111                                 ext4_msg(sb, KERN_ERR,
2112                                         "Cannot turn on journaled "
2113                                         "quota: error %d", ret);
2114                 }
2115         }
2116 #endif
2117
2118         while (es->s_last_orphan) {
2119                 struct inode *inode;
2120
2121                 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
2122                 if (IS_ERR(inode)) {
2123                         es->s_last_orphan = 0;
2124                         break;
2125                 }
2126
2127                 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
2128                 dquot_initialize(inode);
2129                 if (inode->i_nlink) {
2130                         ext4_msg(sb, KERN_DEBUG,
2131                                 "%s: truncating inode %lu to %lld bytes",
2132                                 __func__, inode->i_ino, inode->i_size);
2133                         jbd_debug(2, "truncating inode %lu to %lld bytes\n",
2134                                   inode->i_ino, inode->i_size);
2135                         ext4_truncate(inode);
2136                         nr_truncates++;
2137                 } else {
2138                         ext4_msg(sb, KERN_DEBUG,
2139                                 "%s: deleting unreferenced inode %lu",
2140                                 __func__, inode->i_ino);
2141                         jbd_debug(2, "deleting unreferenced inode %lu\n",
2142                                   inode->i_ino);
2143                         nr_orphans++;
2144                 }
2145                 iput(inode);  /* The delete magic happens here! */
2146         }
2147
2148 #define PLURAL(x) (x), ((x) == 1) ? "" : "s"
2149
2150         if (nr_orphans)
2151                 ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
2152                        PLURAL(nr_orphans));
2153         if (nr_truncates)
2154                 ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
2155                        PLURAL(nr_truncates));
2156 #ifdef CONFIG_QUOTA
2157         /* Turn quotas off */
2158         for (i = 0; i < MAXQUOTAS; i++) {
2159                 if (sb_dqopt(sb)->files[i])
2160                         dquot_quota_off(sb, i);
2161         }
2162 #endif
2163         sb->s_flags = s_flags; /* Restore MS_RDONLY status */
2164 }
2165
2166 /*
2167  * Maximal extent format file size.
2168  * Resulting logical blkno at s_maxbytes must fit in our on-disk
2169  * extent format containers, within a sector_t, and within i_blocks
2170  * in the vfs.  ext4 inode has 48 bits of i_block in fsblock units,
2171  * so that won't be a limiting factor.
2172  *
2173  * Note, this does *not* consider any metadata overhead for vfs i_blocks.
2174  */
2175 static loff_t ext4_max_size(int blkbits, int has_huge_files)
2176 {
2177         loff_t res;
2178         loff_t upper_limit = MAX_LFS_FILESIZE;
2179
2180         /* small i_blocks in vfs inode? */
2181         if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
2182                 /*
2183                  * CONFIG_LBDAF is not enabled implies the inode
2184                  * i_block represent total blocks in 512 bytes
2185                  * 32 == size of vfs inode i_blocks * 8
2186                  */
2187                 upper_limit = (1LL << 32) - 1;
2188
2189                 /* total blocks in file system block size */
2190                 upper_limit >>= (blkbits - 9);
2191                 upper_limit <<= blkbits;
2192         }
2193
2194         /* 32-bit extent-start container, ee_block */
2195         res = 1LL << 32;
2196         res <<= blkbits;
2197         res -= 1;
2198
2199         /* Sanity check against vm- & vfs- imposed limits */
2200         if (res > upper_limit)
2201                 res = upper_limit;
2202
2203         return res;
2204 }
2205
2206 /*
2207  * Maximal bitmap file size.  There is a direct, and {,double-,triple-}indirect
2208  * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2209  * We need to be 1 filesystem block less than the 2^48 sector limit.
2210  */
2211 static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
2212 {
2213         loff_t res = EXT4_NDIR_BLOCKS;
2214         int meta_blocks;
2215         loff_t upper_limit;
2216         /* This is calculated to be the largest file size for a dense, block
2217          * mapped file such that the file's total number of 512-byte sectors,
2218          * including data and all indirect blocks, does not exceed (2^48 - 1).
2219          *
2220          * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2221          * number of 512-byte sectors of the file.
2222          */
2223
2224         if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
2225                 /*
2226                  * !has_huge_files or CONFIG_LBDAF not enabled implies that
2227                  * the inode i_block field represents total file blocks in
2228                  * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
2229                  */
2230                 upper_limit = (1LL << 32) - 1;
2231
2232                 /* total blocks in file system block size */
2233                 upper_limit >>= (bits - 9);
2234
2235         } else {
2236                 /*
2237                  * We use 48 bit ext4_inode i_blocks
2238                  * With EXT4_HUGE_FILE_FL set the i_blocks
2239                  * represent total number of blocks in
2240                  * file system block size
2241                  */
2242                 upper_limit = (1LL << 48) - 1;
2243
2244         }
2245
2246         /* indirect blocks */
2247         meta_blocks = 1;
2248         /* double indirect blocks */
2249         meta_blocks += 1 + (1LL << (bits-2));
2250         /* tripple indirect blocks */
2251         meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
2252
2253         upper_limit -= meta_blocks;
2254         upper_limit <<= bits;
2255
2256         res += 1LL << (bits-2);
2257         res += 1LL << (2*(bits-2));
2258         res += 1LL << (3*(bits-2));
2259         res <<= bits;
2260         if (res > upper_limit)
2261                 res = upper_limit;
2262
2263         if (res > MAX_LFS_FILESIZE)
2264                 res = MAX_LFS_FILESIZE;
2265
2266         return res;
2267 }
2268
2269 static ext4_fsblk_t descriptor_loc(struct super_block *sb,
2270                                    ext4_fsblk_t logical_sb_block, int nr)
2271 {
2272         struct ext4_sb_info *sbi = EXT4_SB(sb);
2273         ext4_group_t bg, first_meta_bg;
2274         int has_super = 0;
2275
2276         first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
2277
2278         if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
2279             nr < first_meta_bg)
2280                 return logical_sb_block + nr + 1;
2281         bg = sbi->s_desc_per_block * nr;
2282         if (ext4_bg_has_super(sb, bg))
2283                 has_super = 1;
2284
2285         return (has_super + ext4_group_first_block_no(sb, bg));
2286 }
2287
2288 /**
2289  * ext4_get_stripe_size: Get the stripe size.
2290  * @sbi: In memory super block info
2291  *
2292  * If we have specified it via mount option, then
2293  * use the mount option value. If the value specified at mount time is
2294  * greater than the blocks per group use the super block value.
2295  * If the super block value is greater than blocks per group return 0.
2296  * Allocator needs it be less than blocks per group.
2297  *
2298  */
2299 static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
2300 {
2301         unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
2302         unsigned long stripe_width =
2303                         le32_to_cpu(sbi->s_es->s_raid_stripe_width);
2304
2305         if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
2306                 return sbi->s_stripe;
2307
2308         if (stripe_width <= sbi->s_blocks_per_group)
2309                 return stripe_width;
2310
2311         if (stride <= sbi->s_blocks_per_group)
2312                 return stride;
2313
2314         return 0;
2315 }
2316
2317 /* sysfs supprt */
2318
2319 struct ext4_attr {
2320         struct attribute attr;
2321         ssize_t (*show)(struct ext4_attr *, struct ext4_sb_info *, char *);
2322         ssize_t (*store)(struct ext4_attr *, struct ext4_sb_info *,
2323                          const char *, size_t);
2324         int offset;
2325 };
2326
2327 static int parse_strtoul(const char *buf,
2328                 unsigned long max, unsigned long *value)
2329 {
2330         char *endp;
2331
2332         *value = simple_strtoul(skip_spaces(buf), &endp, 0);
2333         endp = skip_spaces(endp);
2334         if (*endp || *value > max)
2335                 return -EINVAL;
2336
2337         return 0;
2338 }
2339
2340 static ssize_t delayed_allocation_blocks_show(struct ext4_attr *a,
2341                                               struct ext4_sb_info *sbi,
2342                                               char *buf)
2343 {
2344         return snprintf(buf, PAGE_SIZE, "%llu\n",
2345                         (s64) percpu_counter_sum(&sbi->s_dirtyblocks_counter));
2346 }
2347
2348 static ssize_t session_write_kbytes_show(struct ext4_attr *a,
2349                                          struct ext4_sb_info *sbi, char *buf)
2350 {
2351         struct super_block *sb = sbi->s_buddy_cache->i_sb;
2352
2353         if (!sb->s_bdev->bd_part)
2354                 return snprintf(buf, PAGE_SIZE, "0\n");
2355         return snprintf(buf, PAGE_SIZE, "%lu\n",
2356                         (part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
2357                          sbi->s_sectors_written_start) >> 1);
2358 }
2359
2360 static ssize_t lifetime_write_kbytes_show(struct ext4_attr *a,
2361                                           struct ext4_sb_info *sbi, char *buf)
2362 {
2363         struct super_block *sb = sbi->s_buddy_cache->i_sb;
2364
2365         if (!sb->s_bdev->bd_part)
2366                 return snprintf(buf, PAGE_SIZE, "0\n");
2367         return snprintf(buf, PAGE_SIZE, "%llu\n",
2368                         (unsigned long long)(sbi->s_kbytes_written +
2369                         ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
2370                           EXT4_SB(sb)->s_sectors_written_start) >> 1)));
2371 }
2372
2373 static ssize_t inode_readahead_blks_store(struct ext4_attr *a,
2374                                           struct ext4_sb_info *sbi,
2375                                           const char *buf, size_t count)
2376 {
2377         unsigned long t;
2378
2379         if (parse_strtoul(buf, 0x40000000, &t))
2380                 return -EINVAL;
2381
2382         if (!is_power_of_2(t))
2383                 return -EINVAL;
2384
2385         sbi->s_inode_readahead_blks = t;
2386         return count;
2387 }
2388
2389 static ssize_t sbi_ui_show(struct ext4_attr *a,
2390                            struct ext4_sb_info *sbi, char *buf)
2391 {
2392         unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
2393
2394         return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
2395 }
2396
2397 static ssize_t sbi_ui_store(struct ext4_attr *a,
2398                             struct ext4_sb_info *sbi,
2399                             const char *buf, size_t count)
2400 {
2401         unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
2402         unsigned long t;
2403
2404         if (parse_strtoul(buf, 0xffffffff, &t))
2405                 return -EINVAL;
2406         *ui = t;
2407         return count;
2408 }
2409
2410 #define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \
2411 static struct ext4_attr ext4_attr_##_name = {                   \
2412         .attr = {.name = __stringify(_name), .mode = _mode },   \
2413         .show   = _show,                                        \
2414         .store  = _store,                                       \
2415         .offset = offsetof(struct ext4_sb_info, _elname),       \
2416 }
2417 #define EXT4_ATTR(name, mode, show, store) \
2418 static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store)
2419
2420 #define EXT4_INFO_ATTR(name) EXT4_ATTR(name, 0444, NULL, NULL)
2421 #define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL)
2422 #define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store)
2423 #define EXT4_RW_ATTR_SBI_UI(name, elname)       \
2424         EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname)
2425 #define ATTR_LIST(name) &ext4_attr_##name.attr
2426
2427 EXT4_RO_ATTR(delayed_allocation_blocks);
2428 EXT4_RO_ATTR(session_write_kbytes);
2429 EXT4_RO_ATTR(lifetime_write_kbytes);
2430 EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, sbi_ui_show,
2431                  inode_readahead_blks_store, s_inode_readahead_blks);
2432 EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal);
2433 EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats);
2434 EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan);
2435 EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan);
2436 EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs);
2437 EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request);
2438 EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc);
2439 EXT4_RW_ATTR_SBI_UI(max_writeback_mb_bump, s_max_writeback_mb_bump);
2440
2441 static struct attribute *ext4_attrs[] = {
2442         ATTR_LIST(delayed_allocation_blocks),
2443         ATTR_LIST(session_write_kbytes),
2444         ATTR_LIST(lifetime_write_kbytes),
2445         ATTR_LIST(inode_readahead_blks),
2446         ATTR_LIST(inode_goal),
2447         ATTR_LIST(mb_stats),
2448         ATTR_LIST(mb_max_to_scan),
2449         ATTR_LIST(mb_min_to_scan),
2450         ATTR_LIST(mb_order2_req),
2451         ATTR_LIST(mb_stream_req),
2452         ATTR_LIST(mb_group_prealloc),
2453         ATTR_LIST(max_writeback_mb_bump),
2454         NULL,
2455 };
2456
2457 /* Features this copy of ext4 supports */
2458 EXT4_INFO_ATTR(lazy_itable_init);
2459 EXT4_INFO_ATTR(batched_discard);
2460
2461 static struct attribute *ext4_feat_attrs[] = {
2462         ATTR_LIST(lazy_itable_init),
2463         ATTR_LIST(batched_discard),
2464         NULL,
2465 };
2466
2467 static ssize_t ext4_attr_show(struct kobject *kobj,
2468                               struct attribute *attr, char *buf)
2469 {
2470         struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2471                                                 s_kobj);
2472         struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2473
2474         return a->show ? a->show(a, sbi, buf) : 0;
2475 }
2476
2477 static ssize_t ext4_attr_store(struct kobject *kobj,
2478                                struct attribute *attr,
2479                                const char *buf, size_t len)
2480 {
2481         struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2482                                                 s_kobj);
2483         struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2484
2485         return a->store ? a->store(a, sbi, buf, len) : 0;
2486 }
2487
2488 static void ext4_sb_release(struct kobject *kobj)
2489 {
2490         struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2491                                                 s_kobj);
2492         complete(&sbi->s_kobj_unregister);
2493 }
2494
2495 static const struct sysfs_ops ext4_attr_ops = {
2496         .show   = ext4_attr_show,
2497         .store  = ext4_attr_store,
2498 };
2499
2500 static struct kobj_type ext4_ktype = {
2501         .default_attrs  = ext4_attrs,
2502         .sysfs_ops      = &ext4_attr_ops,
2503         .release        = ext4_sb_release,
2504 };
2505
2506 static void ext4_feat_release(struct kobject *kobj)
2507 {
2508         complete(&ext4_feat->f_kobj_unregister);
2509 }
2510
2511 static struct kobj_type ext4_feat_ktype = {
2512         .default_attrs  = ext4_feat_attrs,
2513         .sysfs_ops      = &ext4_attr_ops,
2514         .release        = ext4_feat_release,
2515 };
2516
2517 /*
2518  * Check whether this filesystem can be mounted based on
2519  * the features present and the RDONLY/RDWR mount requested.
2520  * Returns 1 if this filesystem can be mounted as requested,
2521  * 0 if it cannot be.
2522  */
2523 static int ext4_feature_set_ok(struct super_block *sb, int readonly)
2524 {
2525         if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP)) {
2526                 ext4_msg(sb, KERN_ERR,
2527                         "Couldn't mount because of "
2528                         "unsupported optional features (%x)",
2529                         (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
2530                         ~EXT4_FEATURE_INCOMPAT_SUPP));
2531                 return 0;
2532         }
2533
2534         if (readonly)
2535                 return 1;
2536
2537         /* Check that feature set is OK for a read-write mount */
2538         if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP)) {
2539                 ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of "
2540                          "unsupported optional features (%x)",
2541                          (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
2542                                 ~EXT4_FEATURE_RO_COMPAT_SUPP));
2543                 return 0;
2544         }
2545         /*
2546          * Large file size enabled file system can only be mounted
2547          * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
2548          */
2549         if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) {
2550                 if (sizeof(blkcnt_t) < sizeof(u64)) {
2551                         ext4_msg(sb, KERN_ERR, "Filesystem with huge files "
2552                                  "cannot be mounted RDWR without "
2553                                  "CONFIG_LBDAF");
2554                         return 0;
2555                 }
2556         }
2557         return 1;
2558 }
2559
2560 /*
2561  * This function is called once a day if we have errors logged
2562  * on the file system
2563  */
2564 static void print_daily_error_info(unsigned long arg)
2565 {
2566         struct super_block *sb = (struct super_block *) arg;
2567         struct ext4_sb_info *sbi;
2568         struct ext4_super_block *es;
2569
2570         sbi = EXT4_SB(sb);
2571         es = sbi->s_es;
2572
2573         if (es->s_error_count)
2574                 ext4_msg(sb, KERN_NOTICE, "error count: %u",
2575                          le32_to_cpu(es->s_error_count));
2576         if (es->s_first_error_time) {
2577                 printk(KERN_NOTICE "EXT4-fs (%s): initial error at %u: %.*s:%d",
2578                        sb->s_id, le32_to_cpu(es->s_first_error_time),
2579                        (int) sizeof(es->s_first_error_func),
2580                        es->s_first_error_func,
2581                        le32_to_cpu(es->s_first_error_line));
2582                 if (es->s_first_error_ino)
2583                         printk(": inode %u",
2584                                le32_to_cpu(es->s_first_error_ino));
2585                 if (es->s_first_error_block)
2586                         printk(": block %llu", (unsigned long long)
2587                                le64_to_cpu(es->s_first_error_block));
2588                 printk("\n");
2589         }
2590         if (es->s_last_error_time) {
2591                 printk(KERN_NOTICE "EXT4-fs (%s): last error at %u: %.*s:%d",
2592                        sb->s_id, le32_to_cpu(es->s_last_error_time),
2593                        (int) sizeof(es->s_last_error_func),
2594                        es->s_last_error_func,
2595                        le32_to_cpu(es->s_last_error_line));
2596                 if (es->s_last_error_ino)
2597                         printk(": inode %u",
2598                                le32_to_cpu(es->s_last_error_ino));
2599                 if (es->s_last_error_block)
2600                         printk(": block %llu", (unsigned long long)
2601                                le64_to_cpu(es->s_last_error_block));
2602                 printk("\n");
2603         }
2604         mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ);  /* Once a day */
2605 }
2606
2607 static void ext4_lazyinode_timeout(unsigned long data)
2608 {
2609         struct task_struct *p = (struct task_struct *)data;
2610         wake_up_process(p);
2611 }
2612
2613 /* Find next suitable group and run ext4_init_inode_table */
2614 static int ext4_run_li_request(struct ext4_li_request *elr)
2615 {
2616         struct ext4_group_desc *gdp = NULL;
2617         ext4_group_t group, ngroups;
2618         struct super_block *sb;
2619         unsigned long timeout = 0;
2620         int ret = 0;
2621
2622         sb = elr->lr_super;
2623         ngroups = EXT4_SB(sb)->s_groups_count;
2624
2625         for (group = elr->lr_next_group; group < ngroups; group++) {
2626                 gdp = ext4_get_group_desc(sb, group, NULL);
2627                 if (!gdp) {
2628                         ret = 1;
2629                         break;
2630                 }
2631
2632                 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2633                         break;
2634         }
2635
2636         if (group == ngroups)
2637                 ret = 1;
2638
2639         if (!ret) {
2640                 timeout = jiffies;
2641                 ret = ext4_init_inode_table(sb, group,
2642                                             elr->lr_timeout ? 0 : 1);
2643                 if (elr->lr_timeout == 0) {
2644                         timeout = jiffies - timeout;
2645                         if (elr->lr_sbi->s_li_wait_mult)
2646                                 timeout *= elr->lr_sbi->s_li_wait_mult;
2647                         else
2648                                 timeout *= 20;
2649                         elr->lr_timeout = timeout;
2650                 }
2651                 elr->lr_next_sched = jiffies + elr->lr_timeout;
2652                 elr->lr_next_group = group + 1;
2653         }
2654
2655         return ret;
2656 }
2657
2658 /*
2659  * Remove lr_request from the list_request and free the
2660  * request tructure. Should be called with li_list_mtx held
2661  */
2662 static void ext4_remove_li_request(struct ext4_li_request *elr)
2663 {
2664         struct ext4_sb_info *sbi;
2665
2666         if (!elr)
2667                 return;
2668
2669         sbi = elr->lr_sbi;
2670
2671         list_del(&elr->lr_request);
2672         sbi->s_li_request = NULL;
2673         kfree(elr);
2674 }
2675
2676 static void ext4_unregister_li_request(struct super_block *sb)
2677 {
2678         struct ext4_li_request *elr = EXT4_SB(sb)->s_li_request;
2679
2680         if (!ext4_li_info)
2681                 return;
2682
2683         mutex_lock(&ext4_li_info->li_list_mtx);
2684         ext4_remove_li_request(elr);
2685         mutex_unlock(&ext4_li_info->li_list_mtx);
2686 }
2687
2688 /*
2689  * This is the function where ext4lazyinit thread lives. It walks
2690  * through the request list searching for next scheduled filesystem.
2691  * When such a fs is found, run the lazy initialization request
2692  * (ext4_rn_li_request) and keep track of the time spend in this
2693  * function. Based on that time we compute next schedule time of
2694  * the request. When walking through the list is complete, compute
2695  * next waking time and put itself into sleep.
2696  */
2697 static int ext4_lazyinit_thread(void *arg)
2698 {
2699         struct ext4_lazy_init *eli = (struct ext4_lazy_init *)arg;
2700         struct list_head *pos, *n;
2701         struct ext4_li_request *elr;
2702         unsigned long next_wakeup;
2703         DEFINE_WAIT(wait);
2704
2705         BUG_ON(NULL == eli);
2706
2707         eli->li_timer.data = (unsigned long)current;
2708         eli->li_timer.function = ext4_lazyinode_timeout;
2709
2710         eli->li_task = current;
2711         wake_up(&eli->li_wait_task);
2712
2713 cont_thread:
2714         while (true) {
2715                 next_wakeup = MAX_JIFFY_OFFSET;
2716
2717                 mutex_lock(&eli->li_list_mtx);
2718                 if (list_empty(&eli->li_request_list)) {
2719                         mutex_unlock(&eli->li_list_mtx);
2720                         goto exit_thread;
2721                 }
2722
2723                 list_for_each_safe(pos, n, &eli->li_request_list) {
2724                         elr = list_entry(pos, struct ext4_li_request,
2725                                          lr_request);
2726
2727                         if (time_after_eq(jiffies, elr->lr_next_sched)) {
2728                                 if (ext4_run_li_request(elr) != 0) {
2729                                         /* error, remove the lazy_init job */
2730                                         ext4_remove_li_request(elr);
2731                                         continue;
2732                                 }
2733                         }
2734
2735                         if (time_before(elr->lr_next_sched, next_wakeup))
2736                                 next_wakeup = elr->lr_next_sched;
2737                 }
2738                 mutex_unlock(&eli->li_list_mtx);
2739
2740                 if (freezing(current))
2741                         refrigerator();
2742
2743                 if ((time_after_eq(jiffies, next_wakeup)) ||
2744                     (MAX_JIFFY_OFFSET == next_wakeup)) {
2745                         cond_resched();
2746                         continue;
2747                 }
2748
2749                 eli->li_timer.expires = next_wakeup;
2750                 add_timer(&eli->li_timer);
2751                 prepare_to_wait(&eli->li_wait_daemon, &wait,
2752                                 TASK_INTERRUPTIBLE);
2753                 if (time_before(jiffies, next_wakeup))
2754                         schedule();
2755                 finish_wait(&eli->li_wait_daemon, &wait);
2756         }
2757
2758 exit_thread:
2759         /*
2760          * It looks like the request list is empty, but we need
2761          * to check it under the li_list_mtx lock, to prevent any
2762          * additions into it, and of course we should lock ext4_li_mtx
2763          * to atomically free the list and ext4_li_info, because at
2764          * this point another ext4 filesystem could be registering
2765          * new one.
2766          */
2767         mutex_lock(&ext4_li_mtx);
2768         mutex_lock(&eli->li_list_mtx);
2769         if (!list_empty(&eli->li_request_list)) {
2770                 mutex_unlock(&eli->li_list_mtx);
2771                 mutex_unlock(&ext4_li_mtx);
2772                 goto cont_thread;
2773         }
2774         mutex_unlock(&eli->li_list_mtx);
2775         del_timer_sync(&ext4_li_info->li_timer);
2776         eli->li_task = NULL;
2777         wake_up(&eli->li_wait_task);
2778
2779         kfree(ext4_li_info);
2780         ext4_li_info = NULL;
2781         mutex_unlock(&ext4_li_mtx);
2782
2783         return 0;
2784 }
2785
2786 static void ext4_clear_request_list(void)
2787 {
2788         struct list_head *pos, *n;
2789         struct ext4_li_request *elr;
2790
2791         mutex_lock(&ext4_li_info->li_list_mtx);
2792         if (list_empty(&ext4_li_info->li_request_list))
2793                 return;
2794
2795         list_for_each_safe(pos, n, &ext4_li_info->li_request_list) {
2796                 elr = list_entry(pos, struct ext4_li_request,
2797                                  lr_request);
2798                 ext4_remove_li_request(elr);
2799         }
2800         mutex_unlock(&ext4_li_info->li_list_mtx);
2801 }
2802
2803 static int ext4_run_lazyinit_thread(void)
2804 {
2805         struct task_struct *t;
2806
2807         t = kthread_run(ext4_lazyinit_thread, ext4_li_info, "ext4lazyinit");
2808         if (IS_ERR(t)) {
2809                 int err = PTR_ERR(t);
2810                 ext4_clear_request_list();
2811                 del_timer_sync(&ext4_li_info->li_timer);
2812                 kfree(ext4_li_info);
2813                 ext4_li_info = NULL;
2814                 printk(KERN_CRIT "EXT4: error %d creating inode table "
2815                                  "initialization thread\n",
2816                                  err);
2817                 return err;
2818         }
2819         ext4_li_info->li_state |= EXT4_LAZYINIT_RUNNING;
2820
2821         wait_event(ext4_li_info->li_wait_task, ext4_li_info->li_task != NULL);
2822         return 0;
2823 }
2824
2825 /*
2826  * Check whether it make sense to run itable init. thread or not.
2827  * If there is at least one uninitialized inode table, return
2828  * corresponding group number, else the loop goes through all
2829  * groups and return total number of groups.
2830  */
2831 static ext4_group_t ext4_has_uninit_itable(struct super_block *sb)
2832 {
2833         ext4_group_t group, ngroups = EXT4_SB(sb)->s_groups_count;
2834         struct ext4_group_desc *gdp = NULL;
2835
2836         for (group = 0; group < ngroups; group++) {
2837                 gdp = ext4_get_group_desc(sb, group, NULL);
2838                 if (!gdp)
2839                         continue;
2840
2841                 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2842                         break;
2843         }
2844
2845         return group;
2846 }
2847
2848 static int ext4_li_info_new(void)
2849 {
2850         struct ext4_lazy_init *eli = NULL;
2851
2852         eli = kzalloc(sizeof(*eli), GFP_KERNEL);
2853         if (!eli)
2854                 return -ENOMEM;
2855
2856         eli->li_task = NULL;
2857         INIT_LIST_HEAD(&eli->li_request_list);
2858         mutex_init(&eli->li_list_mtx);
2859
2860         init_waitqueue_head(&eli->li_wait_daemon);
2861         init_waitqueue_head(&eli->li_wait_task);
2862         init_timer(&eli->li_timer);
2863         eli->li_state |= EXT4_LAZYINIT_QUIT;
2864
2865         ext4_li_info = eli;
2866
2867         return 0;
2868 }
2869
2870 static struct ext4_li_request *ext4_li_request_new(struct super_block *sb,
2871                                             ext4_group_t start)
2872 {
2873         struct ext4_sb_info *sbi = EXT4_SB(sb);
2874         struct ext4_li_request *elr;
2875         unsigned long rnd;
2876
2877         elr = kzalloc(sizeof(*elr), GFP_KERNEL);
2878         if (!elr)
2879                 return NULL;
2880
2881         elr->lr_super = sb;
2882         elr->lr_sbi = sbi;
2883         elr->lr_next_group = start;
2884
2885         /*
2886          * Randomize first schedule time of the request to
2887          * spread the inode table initialization requests
2888          * better.
2889          */
2890         get_random_bytes(&rnd, sizeof(rnd));
2891         elr->lr_next_sched = jiffies + (unsigned long)rnd %
2892                              (EXT4_DEF_LI_MAX_START_DELAY * HZ);
2893
2894         return elr;
2895 }
2896
2897 static int ext4_register_li_request(struct super_block *sb,
2898                                     ext4_group_t first_not_zeroed)
2899 {
2900         struct ext4_sb_info *sbi = EXT4_SB(sb);
2901         struct ext4_li_request *elr;
2902         ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
2903         int ret;
2904
2905         if (sbi->s_li_request != NULL)
2906                 return 0;
2907
2908         if (first_not_zeroed == ngroups ||
2909             (sb->s_flags & MS_RDONLY) ||
2910             !test_opt(sb, INIT_INODE_TABLE)) {
2911                 sbi->s_li_request = NULL;
2912                 return 0;
2913         }
2914
2915         if (first_not_zeroed == ngroups) {
2916                 sbi->s_li_request = NULL;
2917                 return 0;
2918         }
2919
2920         elr = ext4_li_request_new(sb, first_not_zeroed);
2921         if (!elr)
2922                 return -ENOMEM;
2923
2924         mutex_lock(&ext4_li_mtx);
2925
2926         if (NULL == ext4_li_info) {
2927                 ret = ext4_li_info_new();
2928                 if (ret)
2929                         goto out;
2930         }
2931
2932         mutex_lock(&ext4_li_info->li_list_mtx);
2933         list_add(&elr->lr_request, &ext4_li_info->li_request_list);
2934         mutex_unlock(&ext4_li_info->li_list_mtx);
2935
2936         sbi->s_li_request = elr;
2937
2938         if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) {
2939                 ret = ext4_run_lazyinit_thread();
2940                 if (ret)
2941                         goto out;
2942         }
2943 out:
2944         mutex_unlock(&ext4_li_mtx);
2945         if (ret)
2946                 kfree(elr);
2947         return ret;
2948 }
2949
2950 /*
2951  * We do not need to lock anything since this is called on
2952  * module unload.
2953  */
2954 static void ext4_destroy_lazyinit_thread(void)
2955 {
2956         /*
2957          * If thread exited earlier
2958          * there's nothing to be done.
2959          */
2960         if (!ext4_li_info)
2961                 return;
2962
2963         ext4_clear_request_list();
2964
2965         while (ext4_li_info->li_task) {
2966                 wake_up(&ext4_li_info->li_wait_daemon);
2967                 wait_event(ext4_li_info->li_wait_task,
2968                            ext4_li_info->li_task == NULL);
2969         }
2970 }
2971
2972 static int ext4_fill_super(struct super_block *sb, void *data, int silent)
2973                                 __releases(kernel_lock)
2974                                 __acquires(kernel_lock)
2975 {
2976         char *orig_data = kstrdup(data, GFP_KERNEL);
2977         struct buffer_head *bh;
2978         struct ext4_super_block *es = NULL;
2979         struct ext4_sb_info *sbi;
2980         ext4_fsblk_t block;
2981         ext4_fsblk_t sb_block = get_sb_block(&data);
2982         ext4_fsblk_t logical_sb_block;
2983         unsigned long offset = 0;
2984         unsigned long journal_devnum = 0;
2985         unsigned long def_mount_opts;
2986         struct inode *root;
2987         char *cp;
2988         const char *descr;
2989         int ret = -ENOMEM;
2990         int blocksize;
2991         unsigned int db_count;
2992         unsigned int i;
2993         int needs_recovery, has_huge_files;
2994         __u64 blocks_count;
2995         int err;
2996         unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
2997         ext4_group_t first_not_zeroed;
2998
2999         sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
3000         if (!sbi)
3001                 goto out_free_orig;
3002
3003         sbi->s_blockgroup_lock =
3004                 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
3005         if (!sbi->s_blockgroup_lock) {
3006                 kfree(sbi);
3007                 goto out_free_orig;
3008         }
3009         sb->s_fs_info = sbi;
3010         sbi->s_mount_opt = 0;
3011         sbi->s_resuid = EXT4_DEF_RESUID;
3012         sbi->s_resgid = EXT4_DEF_RESGID;
3013         sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
3014         sbi->s_sb_block = sb_block;
3015         if (sb->s_bdev->bd_part)
3016                 sbi->s_sectors_written_start =
3017                         part_stat_read(sb->s_bdev->bd_part, sectors[1]);
3018
3019         /* Cleanup superblock name */
3020         for (cp = sb->s_id; (cp = strchr(cp, '/'));)
3021                 *cp = '!';
3022
3023         ret = -EINVAL;
3024         blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
3025         if (!blocksize) {
3026                 ext4_msg(sb, KERN_ERR, "unable to set blocksize");
3027                 goto out_fail;
3028         }
3029
3030         /*
3031          * The ext4 superblock will not be buffer aligned for other than 1kB
3032          * block sizes.  We need to calculate the offset from buffer start.
3033          */
3034         if (blocksize != EXT4_MIN_BLOCK_SIZE) {
3035                 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3036                 offset = do_div(logical_sb_block, blocksize);
3037         } else {
3038                 logical_sb_block = sb_block;
3039         }
3040
3041         if (!(bh = sb_bread(sb, logical_sb_block))) {
3042                 ext4_msg(sb, KERN_ERR, "unable to read superblock");
3043                 goto out_fail;
3044         }
3045         /*
3046          * Note: s_es must be initialized as soon as possible because
3047          *       some ext4 macro-instructions depend on its value
3048          */
3049         es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
3050         sbi->s_es = es;
3051         sb->s_magic = le16_to_cpu(es->s_magic);
3052         if (sb->s_magic != EXT4_SUPER_MAGIC)
3053                 goto cantfind_ext4;
3054         sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
3055
3056         /* Set defaults before we parse the mount options */
3057         def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
3058         set_opt(sbi->s_mount_opt, INIT_INODE_TABLE);
3059         if (def_mount_opts & EXT4_DEFM_DEBUG)
3060                 set_opt(sbi->s_mount_opt, DEBUG);
3061         if (def_mount_opts & EXT4_DEFM_BSDGROUPS) {
3062                 ext4_msg(sb, KERN_WARNING, deprecated_msg, "bsdgroups",
3063                         "2.6.38");
3064                 set_opt(sbi->s_mount_opt, GRPID);
3065         }
3066         if (def_mount_opts & EXT4_DEFM_UID16)
3067                 set_opt(sbi->s_mount_opt, NO_UID32);
3068 #ifdef CONFIG_EXT4_FS_XATTR
3069         if (def_mount_opts & EXT4_DEFM_XATTR_USER)
3070                 set_opt(sbi->s_mount_opt, XATTR_USER);
3071 #endif
3072 #ifdef CONFIG_EXT4_FS_POSIX_ACL
3073         if (def_mount_opts & EXT4_DEFM_ACL)
3074                 set_opt(sbi->s_mount_opt, POSIX_ACL);
3075 #endif
3076         if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
3077                 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
3078         else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
3079                 set_opt(sbi->s_mount_opt, ORDERED_DATA);
3080         else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
3081                 set_opt(sbi->s_mount_opt, WRITEBACK_DATA);
3082
3083         if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
3084                 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
3085         else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
3086                 set_opt(sbi->s_mount_opt, ERRORS_CONT);
3087         else
3088                 set_opt(sbi->s_mount_opt, ERRORS_RO);
3089         if (def_mount_opts & EXT4_DEFM_BLOCK_VALIDITY)
3090                 set_opt(sbi->s_mount_opt, BLOCK_VALIDITY);
3091         if (def_mount_opts & EXT4_DEFM_DISCARD)
3092                 set_opt(sbi->s_mount_opt, DISCARD);
3093
3094         sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
3095         sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
3096         sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
3097         sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
3098         sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
3099
3100         if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0)
3101                 set_opt(sbi->s_mount_opt, BARRIER);
3102
3103         /*
3104          * enable delayed allocation by default
3105          * Use -o nodelalloc to turn it off
3106          */
3107         if (!IS_EXT3_SB(sb) &&
3108             ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0))
3109                 set_opt(sbi->s_mount_opt, DELALLOC);
3110
3111         if (!parse_options((char *) sbi->s_es->s_mount_opts, sb,
3112                            &journal_devnum, &journal_ioprio, NULL, 0)) {
3113                 ext4_msg(sb, KERN_WARNING,
3114                          "failed to parse options in superblock: %s",
3115                          sbi->s_es->s_mount_opts);
3116         }
3117         if (!parse_options((char *) data, sb, &journal_devnum,
3118                            &journal_ioprio, NULL, 0))
3119                 goto failed_mount;
3120
3121         sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
3122                 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
3123
3124         if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
3125             (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
3126              EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
3127              EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
3128                 ext4_msg(sb, KERN_WARNING,
3129                        "feature flags set on rev 0 fs, "
3130                        "running e2fsck is recommended");
3131
3132         /*
3133          * Check feature flags regardless of the revision level, since we
3134          * previously didn't change the revision level when setting the flags,
3135          * so there is a chance incompat flags are set on a rev 0 filesystem.
3136          */
3137         if (!ext4_feature_set_ok(sb, (sb->s_flags & MS_RDONLY)))
3138                 goto failed_mount;
3139
3140         blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
3141
3142         if (blocksize < EXT4_MIN_BLOCK_SIZE ||
3143             blocksize > EXT4_MAX_BLOCK_SIZE) {
3144                 ext4_msg(sb, KERN_ERR,
3145                        "Unsupported filesystem blocksize %d", blocksize);
3146                 goto failed_mount;
3147         }
3148
3149         if (sb->s_blocksize != blocksize) {
3150                 /* Validate the filesystem blocksize */
3151                 if (!sb_set_blocksize(sb, blocksize)) {
3152                         ext4_msg(sb, KERN_ERR, "bad block size %d",
3153                                         blocksize);
3154                         goto failed_mount;
3155                 }
3156
3157                 brelse(bh);
3158                 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3159                 offset = do_div(logical_sb_block, blocksize);
3160                 bh = sb_bread(sb, logical_sb_block);
3161                 if (!bh) {
3162                         ext4_msg(sb, KERN_ERR,
3163                                "Can't read superblock on 2nd try");
3164                         goto failed_mount;
3165                 }
3166                 es = (struct ext4_super_block *)(((char *)bh->b_data) + offset);
3167                 sbi->s_es = es;
3168                 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
3169                         ext4_msg(sb, KERN_ERR,
3170                                "Magic mismatch, very weird!");
3171                         goto failed_mount;
3172                 }
3173         }
3174
3175         has_huge_files = EXT4_HAS_RO_COMPAT_FEATURE(sb,
3176                                 EXT4_FEATURE_RO_COMPAT_HUGE_FILE);
3177         sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
3178                                                       has_huge_files);
3179         sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
3180
3181         if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
3182                 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
3183                 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
3184         } else {
3185                 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
3186                 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
3187                 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
3188                     (!is_power_of_2(sbi->s_inode_size)) ||
3189                     (sbi->s_inode_size > blocksize)) {
3190                         ext4_msg(sb, KERN_ERR,
3191                                "unsupported inode size: %d",
3192                                sbi->s_inode_size);
3193                         goto failed_mount;
3194                 }
3195                 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
3196                         sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
3197         }
3198
3199         sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
3200         if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
3201                 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
3202                     sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
3203                     !is_power_of_2(sbi->s_desc_size)) {
3204                         ext4_msg(sb, KERN_ERR,
3205                                "unsupported descriptor size %lu",
3206                                sbi->s_desc_size);
3207                         goto failed_mount;
3208                 }
3209         } else
3210                 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
3211
3212         sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
3213         sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
3214         if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
3215                 goto cantfind_ext4;
3216
3217         sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
3218         if (sbi->s_inodes_per_block == 0)
3219                 goto cantfind_ext4;
3220         sbi->s_itb_per_group = sbi->s_inodes_per_group /
3221                                         sbi->s_inodes_per_block;
3222         sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
3223         sbi->s_sbh = bh;
3224         sbi->s_mount_state = le16_to_cpu(es->s_state);
3225         sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
3226         sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
3227
3228         for (i = 0; i < 4; i++)
3229                 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
3230         sbi->s_def_hash_version = es->s_def_hash_version;
3231         i = le32_to_cpu(es->s_flags);
3232         if (i & EXT2_FLAGS_UNSIGNED_HASH)
3233                 sbi->s_hash_unsigned = 3;
3234         else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
3235 #ifdef __CHAR_UNSIGNED__
3236                 es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
3237                 sbi->s_hash_unsigned = 3;
3238 #else
3239                 es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
3240 #endif
3241                 sb->s_dirt = 1;
3242         }
3243
3244         if (sbi->s_blocks_per_group > blocksize * 8) {
3245                 ext4_msg(sb, KERN_ERR,
3246                        "#blocks per group too big: %lu",
3247                        sbi->s_blocks_per_group);
3248                 goto failed_mount;
3249         }
3250         if (sbi->s_inodes_per_group > blocksize * 8) {
3251                 ext4_msg(sb, KERN_ERR,
3252                        "#inodes per group too big: %lu",
3253                        sbi->s_inodes_per_group);
3254                 goto failed_mount;
3255         }
3256
3257         /*
3258          * Test whether we have more sectors than will fit in sector_t,
3259          * and whether the max offset is addressable by the page cache.
3260          */
3261         ret = generic_check_addressable(sb->s_blocksize_bits,
3262                                         ext4_blocks_count(es));
3263         if (ret) {
3264                 ext4_msg(sb, KERN_ERR, "filesystem"
3265                          " too large to mount safely on this system");
3266                 if (sizeof(sector_t) < 8)
3267                         ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled");
3268                 goto failed_mount;
3269         }
3270
3271         if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
3272                 goto cantfind_ext4;
3273
3274         /* check blocks count against device size */
3275         blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
3276         if (blocks_count && ext4_blocks_count(es) > blocks_count) {
3277                 ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
3278                        "exceeds size of device (%llu blocks)",
3279                        ext4_blocks_count(es), blocks_count);
3280                 goto failed_mount;
3281         }
3282
3283         /*
3284          * It makes no sense for the first data block to be beyond the end
3285          * of the filesystem.
3286          */
3287         if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
3288                 ext4_msg(sb, KERN_WARNING, "bad geometry: first data"
3289                          "block %u is beyond end of filesystem (%llu)",
3290                          le32_to_cpu(es->s_first_data_block),
3291                          ext4_blocks_count(es));
3292                 goto failed_mount;
3293         }
3294         blocks_count = (ext4_blocks_count(es) -
3295                         le32_to_cpu(es->s_first_data_block) +
3296                         EXT4_BLOCKS_PER_GROUP(sb) - 1);
3297         do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
3298         if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
3299                 ext4_msg(sb, KERN_WARNING, "groups count too large: %u "
3300                        "(block count %llu, first data block %u, "
3301                        "blocks per group %lu)", sbi->s_groups_count,
3302                        ext4_blocks_count(es),
3303                        le32_to_cpu(es->s_first_data_block),
3304                        EXT4_BLOCKS_PER_GROUP(sb));
3305                 goto failed_mount;
3306         }
3307         sbi->s_groups_count = blocks_count;
3308         sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
3309                         (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
3310         db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
3311                    EXT4_DESC_PER_BLOCK(sb);
3312         sbi->s_group_desc = kmalloc(db_count * sizeof(struct buffer_head *),
3313                                     GFP_KERNEL);
3314         if (sbi->s_group_desc == NULL) {
3315                 ext4_msg(sb, KERN_ERR, "not enough memory");
3316                 goto failed_mount;
3317         }
3318
3319 #ifdef CONFIG_PROC_FS
3320         if (ext4_proc_root)
3321                 sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);
3322 #endif
3323
3324         bgl_lock_init(sbi->s_blockgroup_lock);
3325
3326         for (i = 0; i < db_count; i++) {
3327                 block = descriptor_loc(sb, logical_sb_block, i);
3328                 sbi->s_group_desc[i] = sb_bread(sb, block);
3329                 if (!sbi->s_group_desc[i]) {
3330                         ext4_msg(sb, KERN_ERR,
3331                                "can't read group descriptor %d", i);
3332                         db_count = i;
3333                         goto failed_mount2;
3334                 }
3335         }
3336         if (!ext4_check_descriptors(sb, &first_not_zeroed)) {
3337                 ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
3338                 goto failed_mount2;
3339         }
3340         if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
3341                 if (!ext4_fill_flex_info(sb)) {
3342                         ext4_msg(sb, KERN_ERR,
3343                                "unable to initialize "
3344                                "flex_bg meta info!");
3345                         goto failed_mount2;
3346                 }
3347
3348         sbi->s_gdb_count = db_count;
3349         get_random_bytes(&sbi->s_next_generation, sizeof(u32));
3350         spin_lock_init(&sbi->s_next_gen_lock);
3351
3352         err = percpu_counter_init(&sbi->s_freeblocks_counter,
3353                         ext4_count_free_blocks(sb));
3354         if (!err) {
3355                 err = percpu_counter_init(&sbi->s_freeinodes_counter,
3356                                 ext4_count_free_inodes(sb));
3357         }
3358         if (!err) {
3359                 err = percpu_counter_init(&sbi->s_dirs_counter,
3360                                 ext4_count_dirs(sb));
3361         }
3362         if (!err) {
3363                 err = percpu_counter_init(&sbi->s_dirtyblocks_counter, 0);
3364         }
3365         if (err) {
3366                 ext4_msg(sb, KERN_ERR, "insufficient memory");
3367                 goto failed_mount3;
3368         }
3369
3370         sbi->s_stripe = ext4_get_stripe_size(sbi);
3371         sbi->s_max_writeback_mb_bump = 128;
3372
3373         /*
3374          * set up enough so that it can read an inode
3375          */
3376         if (!test_opt(sb, NOLOAD) &&
3377             EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
3378                 sb->s_op = &ext4_sops;
3379         else
3380                 sb->s_op = &ext4_nojournal_sops;
3381         sb->s_export_op = &ext4_export_ops;
3382         sb->s_xattr = ext4_xattr_handlers;
3383 #ifdef CONFIG_QUOTA
3384         sb->s_qcop = &ext4_qctl_operations;
3385         sb->dq_op = &ext4_quota_operations;
3386 #endif
3387         INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
3388         mutex_init(&sbi->s_orphan_lock);
3389         mutex_init(&sbi->s_resize_lock);
3390
3391         sb->s_root = NULL;
3392
3393         needs_recovery = (es->s_last_orphan != 0 ||
3394                           EXT4_HAS_INCOMPAT_FEATURE(sb,
3395                                     EXT4_FEATURE_INCOMPAT_RECOVER));
3396
3397         /*
3398          * The first inode we look at is the journal inode.  Don't try
3399          * root first: it may be modified in the journal!
3400          */
3401         if (!test_opt(sb, NOLOAD) &&
3402             EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
3403                 if (ext4_load_journal(sb, es, journal_devnum))
3404                         goto failed_mount3;
3405         } else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) &&
3406               EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
3407                 ext4_msg(sb, KERN_ERR, "required journal recovery "
3408                        "suppressed and not mounted read-only");
3409                 goto failed_mount_wq;
3410         } else {
3411                 clear_opt(sbi->s_mount_opt, DATA_FLAGS);
3412                 set_opt(sbi->s_mount_opt, WRITEBACK_DATA);
3413                 sbi->s_journal = NULL;
3414                 needs_recovery = 0;
3415                 goto no_journal;
3416         }
3417
3418         if (ext4_blocks_count(es) > 0xffffffffULL &&
3419             !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
3420                                        JBD2_FEATURE_INCOMPAT_64BIT)) {
3421                 ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
3422                 goto failed_mount_wq;
3423         }
3424
3425         if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
3426                 jbd2_journal_set_features(sbi->s_journal,
3427                                 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
3428                                 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
3429         } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
3430                 jbd2_journal_set_features(sbi->s_journal,
3431                                 JBD2_FEATURE_COMPAT_CHECKSUM, 0, 0);
3432                 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
3433                                 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
3434         } else {
3435                 jbd2_journal_clear_features(sbi->s_journal,
3436                                 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
3437                                 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
3438         }
3439
3440         /* We have now updated the journal if required, so we can
3441          * validate the data journaling mode. */
3442         switch (test_opt(sb, DATA_FLAGS)) {
3443         case 0:
3444                 /* No mode set, assume a default based on the journal
3445                  * capabilities: ORDERED_DATA if the journal can
3446                  * cope, else JOURNAL_DATA
3447                  */
3448                 if (jbd2_journal_check_available_features
3449                     (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
3450                         set_opt(sbi->s_mount_opt, ORDERED_DATA);
3451                 else
3452                         set_opt(sbi->s_mount_opt, JOURNAL_DATA);
3453                 break;
3454
3455         case EXT4_MOUNT_ORDERED_DATA:
3456         case EXT4_MOUNT_WRITEBACK_DATA:
3457                 if (!jbd2_journal_check_available_features
3458                     (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
3459                         ext4_msg(sb, KERN_ERR, "Journal does not support "
3460                                "requested data journaling mode");
3461                         goto failed_mount_wq;
3462                 }
3463         default:
3464                 break;
3465         }
3466         set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
3467
3468         /*
3469          * The journal may have updated the bg summary counts, so we
3470          * need to update the global counters.
3471          */
3472         percpu_counter_set(&sbi->s_freeblocks_counter,
3473                            ext4_count_free_blocks(sb));
3474         percpu_counter_set(&sbi->s_freeinodes_counter,
3475                            ext4_count_free_inodes(sb));
3476         percpu_counter_set(&sbi->s_dirs_counter,
3477                            ext4_count_dirs(sb));
3478         percpu_counter_set(&sbi->s_dirtyblocks_counter, 0);
3479
3480 no_journal:
3481         EXT4_SB(sb)->dio_unwritten_wq = create_workqueue("ext4-dio-unwritten");
3482         if (!EXT4_SB(sb)->dio_unwritten_wq) {
3483                 printk(KERN_ERR "EXT4-fs: failed to create DIO workqueue\n");
3484                 goto failed_mount_wq;
3485         }
3486
3487         /*
3488          * The jbd2_journal_load will have done any necessary log recovery,
3489          * so we can safely mount the rest of the filesystem now.
3490          */
3491
3492         root = ext4_iget(sb, EXT4_ROOT_INO);
3493         if (IS_ERR(root)) {
3494                 ext4_msg(sb, KERN_ERR, "get root inode failed");
3495                 ret = PTR_ERR(root);
3496                 goto failed_mount4;
3497         }
3498         if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
3499                 iput(root);
3500                 ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
3501                 goto failed_mount4;
3502         }
3503         sb->s_root = d_alloc_root(root);
3504         if (!sb->s_root) {
3505                 ext4_msg(sb, KERN_ERR, "get root dentry failed");
3506                 iput(root);
3507                 ret = -ENOMEM;
3508                 goto failed_mount4;
3509         }
3510
3511         ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY);
3512
3513         /* determine the minimum size of new large inodes, if present */
3514         if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
3515                 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
3516                                                      EXT4_GOOD_OLD_INODE_SIZE;
3517                 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3518                                        EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) {
3519                         if (sbi->s_want_extra_isize <
3520                             le16_to_cpu(es->s_want_extra_isize))
3521                                 sbi->s_want_extra_isize =
3522                                         le16_to_cpu(es->s_want_extra_isize);
3523                         if (sbi->s_want_extra_isize <
3524                             le16_to_cpu(es->s_min_extra_isize))
3525                                 sbi->s_want_extra_isize =
3526                                         le16_to_cpu(es->s_min_extra_isize);
3527                 }
3528         }
3529         /* Check if enough inode space is available */
3530         if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
3531                                                         sbi->s_inode_size) {
3532                 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
3533                                                        EXT4_GOOD_OLD_INODE_SIZE;
3534                 ext4_msg(sb, KERN_INFO, "required extra inode space not"
3535                          "available");
3536         }
3537
3538         if (test_opt(sb, DELALLOC) &&
3539             (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)) {
3540                 ext4_msg(sb, KERN_WARNING, "Ignoring delalloc option - "
3541                          "requested data journaling mode");
3542                 clear_opt(sbi->s_mount_opt, DELALLOC);
3543         }
3544         if (test_opt(sb, DIOREAD_NOLOCK)) {
3545                 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
3546                         ext4_msg(sb, KERN_WARNING, "Ignoring dioread_nolock "
3547                                 "option - requested data journaling mode");
3548                         clear_opt(sbi->s_mount_opt, DIOREAD_NOLOCK);
3549                 }
3550                 if (sb->s_blocksize < PAGE_SIZE) {
3551                         ext4_msg(sb, KERN_WARNING, "Ignoring dioread_nolock "
3552                                 "option - block size is too small");
3553                         clear_opt(sbi->s_mount_opt, DIOREAD_NOLOCK);
3554                 }
3555         }
3556
3557         err = ext4_setup_system_zone(sb);
3558         if (err) {
3559                 ext4_msg(sb, KERN_ERR, "failed to initialize system "
3560                          "zone (%d)", err);
3561                 goto failed_mount4;
3562         }
3563
3564         ext4_ext_init(sb);
3565         err = ext4_mb_init(sb, needs_recovery);
3566         if (err) {
3567                 ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)",
3568                          err);
3569                 goto failed_mount4;
3570         }
3571
3572         err = ext4_register_li_request(sb, first_not_zeroed);
3573         if (err)
3574                 goto failed_mount4;
3575
3576         sbi->s_kobj.kset = ext4_kset;
3577         init_completion(&sbi->s_kobj_unregister);
3578         err = kobject_init_and_add(&sbi->s_kobj, &ext4_ktype, NULL,
3579                                    "%s", sb->s_id);
3580         if (err) {
3581                 ext4_mb_release(sb);
3582                 ext4_ext_release(sb);
3583                 goto failed_mount4;
3584         };
3585
3586         EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
3587         ext4_orphan_cleanup(sb, es);
3588         EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
3589         if (needs_recovery) {
3590                 ext4_msg(sb, KERN_INFO, "recovery complete");
3591                 ext4_mark_recovery_complete(sb, es);
3592         }
3593         if (EXT4_SB(sb)->s_journal) {
3594                 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
3595                         descr = " journalled data mode";
3596                 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
3597                         descr = " ordered data mode";
3598                 else
3599                         descr = " writeback data mode";
3600         } else
3601                 descr = "out journal";
3602
3603         ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. "
3604                  "Opts: %s%s%s", descr, sbi->s_es->s_mount_opts,
3605                  *sbi->s_es->s_mount_opts ? "; " : "", orig_data);
3606
3607         init_timer(&sbi->s_err_report);
3608         sbi->s_err_report.function = print_daily_error_info;
3609         sbi->s_err_report.data = (unsigned long) sb;
3610         if (es->s_error_count)
3611                 mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */
3612
3613         kfree(orig_data);
3614         return 0;
3615
3616 cantfind_ext4:
3617         if (!silent)
3618                 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
3619         goto failed_mount;
3620
3621 failed_mount4:
3622         ext4_msg(sb, KERN_ERR, "mount failed");
3623         destroy_workqueue(EXT4_SB(sb)->dio_unwritten_wq);
3624 failed_mount_wq:
3625         ext4_release_system_zone(sb);