OpenCores
URL https://opencores.org/ocsvn/test_project/test_project/trunk

Subversion Repositories test_project

[/] [test_project/] [trunk/] [linux_sd_driver/] [fs/] [ext4/] [super.c] - Blame information for rev 62

Details | Compare with Previous | View Log

Line No. Rev Author Line
1 62 marcus.erl
/*
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/jbd2.h>
24
#include <linux/ext4_fs.h>
25
#include <linux/ext4_jbd2.h>
26
#include <linux/slab.h>
27
#include <linux/init.h>
28
#include <linux/blkdev.h>
29
#include <linux/parser.h>
30
#include <linux/smp_lock.h>
31
#include <linux/buffer_head.h>
32
#include <linux/exportfs.h>
33
#include <linux/vfs.h>
34
#include <linux/random.h>
35
#include <linux/mount.h>
36
#include <linux/namei.h>
37
#include <linux/quotaops.h>
38
#include <linux/seq_file.h>
39
#include <linux/log2.h>
40
#include <linux/crc16.h>
41
 
42
#include <asm/uaccess.h>
43
 
44
#include "xattr.h"
45
#include "acl.h"
46
#include "namei.h"
47
#include "group.h"
48
 
49
static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
50
                             unsigned long journal_devnum);
51
static int ext4_create_journal(struct super_block *, struct ext4_super_block *,
52
                               unsigned int);
53
static void ext4_commit_super (struct super_block * sb,
54
                               struct ext4_super_block * es,
55
                               int sync);
56
static void ext4_mark_recovery_complete(struct super_block * sb,
57
                                        struct ext4_super_block * es);
58
static void ext4_clear_journal_err(struct super_block * sb,
59
                                   struct ext4_super_block * es);
60
static int ext4_sync_fs(struct super_block *sb, int wait);
61
static const char *ext4_decode_error(struct super_block * sb, int errno,
62
                                     char nbuf[16]);
63
static int ext4_remount (struct super_block * sb, int * flags, char * data);
64
static int ext4_statfs (struct dentry * dentry, struct kstatfs * buf);
65
static void ext4_unlockfs(struct super_block *sb);
66
static void ext4_write_super (struct super_block * sb);
67
static void ext4_write_super_lockfs(struct super_block *sb);
68
 
69
 
70
ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
71
                               struct ext4_group_desc *bg)
72
{
73
        return le32_to_cpu(bg->bg_block_bitmap_lo) |
74
                (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
75
                (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
76
}
77
 
78
ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
79
                               struct ext4_group_desc *bg)
80
{
81
        return le32_to_cpu(bg->bg_inode_bitmap_lo) |
82
                (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
83
                (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
84
}
85
 
86
ext4_fsblk_t ext4_inode_table(struct super_block *sb,
87
                              struct ext4_group_desc *bg)
88
{
89
        return le32_to_cpu(bg->bg_inode_table_lo) |
90
                (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
91
                (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
92
}
93
 
94
void ext4_block_bitmap_set(struct super_block *sb,
95
                           struct ext4_group_desc *bg, ext4_fsblk_t blk)
96
{
97
        bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
98
        if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
99
                bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
100
}
101
 
102
void ext4_inode_bitmap_set(struct super_block *sb,
103
                           struct ext4_group_desc *bg, ext4_fsblk_t blk)
104
{
105
        bg->bg_inode_bitmap_lo  = cpu_to_le32((u32)blk);
106
        if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
107
                bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
108
}
109
 
110
void ext4_inode_table_set(struct super_block *sb,
111
                          struct ext4_group_desc *bg, ext4_fsblk_t blk)
112
{
113
        bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
114
        if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
115
                bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
116
}
117
 
118
/*
119
 * Wrappers for jbd2_journal_start/end.
120
 *
121
 * The only special thing we need to do here is to make sure that all
122
 * journal_end calls result in the superblock being marked dirty, so
123
 * that sync() will call the filesystem's write_super callback if
124
 * appropriate.
125
 */
126
handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks)
127
{
128
        journal_t *journal;
129
 
130
        if (sb->s_flags & MS_RDONLY)
131
                return ERR_PTR(-EROFS);
132
 
133
        /* Special case here: if the journal has aborted behind our
134
         * backs (eg. EIO in the commit thread), then we still need to
135
         * take the FS itself readonly cleanly. */
136
        journal = EXT4_SB(sb)->s_journal;
137
        if (is_journal_aborted(journal)) {
138
                ext4_abort(sb, __FUNCTION__,
139
                           "Detected aborted journal");
140
                return ERR_PTR(-EROFS);
141
        }
142
 
143
        return jbd2_journal_start(journal, nblocks);
144
}
145
 
146
/*
147
 * The only special thing we need to do here is to make sure that all
148
 * jbd2_journal_stop calls result in the superblock being marked dirty, so
149
 * that sync() will call the filesystem's write_super callback if
150
 * appropriate.
151
 */
152
int __ext4_journal_stop(const char *where, handle_t *handle)
153
{
154
        struct super_block *sb;
155
        int err;
156
        int rc;
157
 
158
        sb = handle->h_transaction->t_journal->j_private;
159
        err = handle->h_err;
160
        rc = jbd2_journal_stop(handle);
161
 
162
        if (!err)
163
                err = rc;
164
        if (err)
165
                __ext4_std_error(sb, where, err);
166
        return err;
167
}
168
 
169
void ext4_journal_abort_handle(const char *caller, const char *err_fn,
170
                struct buffer_head *bh, handle_t *handle, int err)
171
{
172
        char nbuf[16];
173
        const char *errstr = ext4_decode_error(NULL, err, nbuf);
174
 
175
        if (bh)
176
                BUFFER_TRACE(bh, "abort");
177
 
178
        if (!handle->h_err)
179
                handle->h_err = err;
180
 
181
        if (is_handle_aborted(handle))
182
                return;
183
 
184
        printk(KERN_ERR "%s: aborting transaction: %s in %s\n",
185
               caller, errstr, err_fn);
186
 
187
        jbd2_journal_abort_handle(handle);
188
}
189
 
190
/* Deal with the reporting of failure conditions on a filesystem such as
191
 * inconsistencies detected or read IO failures.
192
 *
193
 * On ext2, we can store the error state of the filesystem in the
194
 * superblock.  That is not possible on ext4, because we may have other
195
 * write ordering constraints on the superblock which prevent us from
196
 * writing it out straight away; and given that the journal is about to
197
 * be aborted, we can't rely on the current, or future, transactions to
198
 * write out the superblock safely.
199
 *
200
 * We'll just use the jbd2_journal_abort() error code to record an error in
201
 * the journal instead.  On recovery, the journal will compain about
202
 * that error until we've noted it down and cleared it.
203
 */
204
 
205
static void ext4_handle_error(struct super_block *sb)
206
{
207
        struct ext4_super_block *es = EXT4_SB(sb)->s_es;
208
 
209
        EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
210
        es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
211
 
212
        if (sb->s_flags & MS_RDONLY)
213
                return;
214
 
215
        if (!test_opt (sb, ERRORS_CONT)) {
216
                journal_t *journal = EXT4_SB(sb)->s_journal;
217
 
218
                EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT;
219
                if (journal)
220
                        jbd2_journal_abort(journal, -EIO);
221
        }
222
        if (test_opt (sb, ERRORS_RO)) {
223
                printk (KERN_CRIT "Remounting filesystem read-only\n");
224
                sb->s_flags |= MS_RDONLY;
225
        }
226
        ext4_commit_super(sb, es, 1);
227
        if (test_opt(sb, ERRORS_PANIC))
228
                panic("EXT4-fs (device %s): panic forced after error\n",
229
                        sb->s_id);
230
}
231
 
232
void ext4_error (struct super_block * sb, const char * function,
233
                 const char * fmt, ...)
234
{
235
        va_list args;
236
 
237
        va_start(args, fmt);
238
        printk(KERN_CRIT "EXT4-fs error (device %s): %s: ",sb->s_id, function);
239
        vprintk(fmt, args);
240
        printk("\n");
241
        va_end(args);
242
 
243
        ext4_handle_error(sb);
244
}
245
 
246
static const char *ext4_decode_error(struct super_block * sb, int errno,
247
                                     char nbuf[16])
248
{
249
        char *errstr = NULL;
250
 
251
        switch (errno) {
252
        case -EIO:
253
                errstr = "IO failure";
254
                break;
255
        case -ENOMEM:
256
                errstr = "Out of memory";
257
                break;
258
        case -EROFS:
259
                if (!sb || EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT)
260
                        errstr = "Journal has aborted";
261
                else
262
                        errstr = "Readonly filesystem";
263
                break;
264
        default:
265
                /* If the caller passed in an extra buffer for unknown
266
                 * errors, textualise them now.  Else we just return
267
                 * NULL. */
268
                if (nbuf) {
269
                        /* Check for truncated error codes... */
270
                        if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
271
                                errstr = nbuf;
272
                }
273
                break;
274
        }
275
 
276
        return errstr;
277
}
278
 
279
/* __ext4_std_error decodes expected errors from journaling functions
280
 * automatically and invokes the appropriate error response.  */
281
 
282
void __ext4_std_error (struct super_block * sb, const char * function,
283
                       int errno)
284
{
285
        char nbuf[16];
286
        const char *errstr;
287
 
288
        /* Special case: if the error is EROFS, and we're not already
289
         * inside a transaction, then there's really no point in logging
290
         * an error. */
291
        if (errno == -EROFS && journal_current_handle() == NULL &&
292
            (sb->s_flags & MS_RDONLY))
293
                return;
294
 
295
        errstr = ext4_decode_error(sb, errno, nbuf);
296
        printk (KERN_CRIT "EXT4-fs error (device %s) in %s: %s\n",
297
                sb->s_id, function, errstr);
298
 
299
        ext4_handle_error(sb);
300
}
301
 
302
/*
303
 * ext4_abort is a much stronger failure handler than ext4_error.  The
304
 * abort function may be used to deal with unrecoverable failures such
305
 * as journal IO errors or ENOMEM at a critical moment in log management.
306
 *
307
 * We unconditionally force the filesystem into an ABORT|READONLY state,
308
 * unless the error response on the fs has been set to panic in which
309
 * case we take the easy way out and panic immediately.
310
 */
311
 
312
void ext4_abort (struct super_block * sb, const char * function,
313
                 const char * fmt, ...)
314
{
315
        va_list args;
316
 
317
        printk (KERN_CRIT "ext4_abort called.\n");
318
 
319
        va_start(args, fmt);
320
        printk(KERN_CRIT "EXT4-fs error (device %s): %s: ",sb->s_id, function);
321
        vprintk(fmt, args);
322
        printk("\n");
323
        va_end(args);
324
 
325
        if (test_opt(sb, ERRORS_PANIC))
326
                panic("EXT4-fs panic from previous error\n");
327
 
328
        if (sb->s_flags & MS_RDONLY)
329
                return;
330
 
331
        printk(KERN_CRIT "Remounting filesystem read-only\n");
332
        EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
333
        sb->s_flags |= MS_RDONLY;
334
        EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT;
335
        jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
336
}
337
 
338
void ext4_warning (struct super_block * sb, const char * function,
339
                   const char * fmt, ...)
340
{
341
        va_list args;
342
 
343
        va_start(args, fmt);
344
        printk(KERN_WARNING "EXT4-fs warning (device %s): %s: ",
345
               sb->s_id, function);
346
        vprintk(fmt, args);
347
        printk("\n");
348
        va_end(args);
349
}
350
 
351
void ext4_update_dynamic_rev(struct super_block *sb)
352
{
353
        struct ext4_super_block *es = EXT4_SB(sb)->s_es;
354
 
355
        if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
356
                return;
357
 
358
        ext4_warning(sb, __FUNCTION__,
359
                     "updating to rev %d because of new feature flag, "
360
                     "running e2fsck is recommended",
361
                     EXT4_DYNAMIC_REV);
362
 
363
        es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
364
        es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
365
        es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
366
        /* leave es->s_feature_*compat flags alone */
367
        /* es->s_uuid will be set by e2fsck if empty */
368
 
369
        /*
370
         * The rest of the superblock fields should be zero, and if not it
371
         * means they are likely already in use, so leave them alone.  We
372
         * can leave it up to e2fsck to clean up any inconsistencies there.
373
         */
374
}
375
 
376
/*
377
 * Open the external journal device
378
 */
379
static struct block_device *ext4_blkdev_get(dev_t dev)
380
{
381
        struct block_device *bdev;
382
        char b[BDEVNAME_SIZE];
383
 
384
        bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
385
        if (IS_ERR(bdev))
386
                goto fail;
387
        return bdev;
388
 
389
fail:
390
        printk(KERN_ERR "EXT4: failed to open journal device %s: %ld\n",
391
                        __bdevname(dev, b), PTR_ERR(bdev));
392
        return NULL;
393
}
394
 
395
/*
396
 * Release the journal device
397
 */
398
static int ext4_blkdev_put(struct block_device *bdev)
399
{
400
        bd_release(bdev);
401
        return blkdev_put(bdev);
402
}
403
 
404
static int ext4_blkdev_remove(struct ext4_sb_info *sbi)
405
{
406
        struct block_device *bdev;
407
        int ret = -ENODEV;
408
 
409
        bdev = sbi->journal_bdev;
410
        if (bdev) {
411
                ret = ext4_blkdev_put(bdev);
412
                sbi->journal_bdev = NULL;
413
        }
414
        return ret;
415
}
416
 
417
static inline struct inode *orphan_list_entry(struct list_head *l)
418
{
419
        return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
420
}
421
 
422
static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
423
{
424
        struct list_head *l;
425
 
426
        printk(KERN_ERR "sb orphan head is %d\n",
427
               le32_to_cpu(sbi->s_es->s_last_orphan));
428
 
429
        printk(KERN_ERR "sb_info orphan list:\n");
430
        list_for_each(l, &sbi->s_orphan) {
431
                struct inode *inode = orphan_list_entry(l);
432
                printk(KERN_ERR "  "
433
                       "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
434
                       inode->i_sb->s_id, inode->i_ino, inode,
435
                       inode->i_mode, inode->i_nlink,
436
                       NEXT_ORPHAN(inode));
437
        }
438
}
439
 
440
static void ext4_put_super (struct super_block * sb)
441
{
442
        struct ext4_sb_info *sbi = EXT4_SB(sb);
443
        struct ext4_super_block *es = sbi->s_es;
444
        int i;
445
 
446
        ext4_ext_release(sb);
447
        ext4_xattr_put_super(sb);
448
        jbd2_journal_destroy(sbi->s_journal);
449
        if (!(sb->s_flags & MS_RDONLY)) {
450
                EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
451
                es->s_state = cpu_to_le16(sbi->s_mount_state);
452
                BUFFER_TRACE(sbi->s_sbh, "marking dirty");
453
                mark_buffer_dirty(sbi->s_sbh);
454
                ext4_commit_super(sb, es, 1);
455
        }
456
 
457
        for (i = 0; i < sbi->s_gdb_count; i++)
458
                brelse(sbi->s_group_desc[i]);
459
        kfree(sbi->s_group_desc);
460
        percpu_counter_destroy(&sbi->s_freeblocks_counter);
461
        percpu_counter_destroy(&sbi->s_freeinodes_counter);
462
        percpu_counter_destroy(&sbi->s_dirs_counter);
463
        brelse(sbi->s_sbh);
464
#ifdef CONFIG_QUOTA
465
        for (i = 0; i < MAXQUOTAS; i++)
466
                kfree(sbi->s_qf_names[i]);
467
#endif
468
 
469
        /* Debugging code just in case the in-memory inode orphan list
470
         * isn't empty.  The on-disk one can be non-empty if we've
471
         * detected an error and taken the fs readonly, but the
472
         * in-memory list had better be clean by this point. */
473
        if (!list_empty(&sbi->s_orphan))
474
                dump_orphan_list(sb, sbi);
475
        J_ASSERT(list_empty(&sbi->s_orphan));
476
 
477
        invalidate_bdev(sb->s_bdev);
478
        if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
479
                /*
480
                 * Invalidate the journal device's buffers.  We don't want them
481
                 * floating about in memory - the physical journal device may
482
                 * hotswapped, and it breaks the `ro-after' testing code.
483
                 */
484
                sync_blockdev(sbi->journal_bdev);
485
                invalidate_bdev(sbi->journal_bdev);
486
                ext4_blkdev_remove(sbi);
487
        }
488
        sb->s_fs_info = NULL;
489
        kfree(sbi);
490
        return;
491
}
492
 
493
static struct kmem_cache *ext4_inode_cachep;
494
 
495
/*
496
 * Called inside transaction, so use GFP_NOFS
497
 */
498
static struct inode *ext4_alloc_inode(struct super_block *sb)
499
{
500
        struct ext4_inode_info *ei;
501
 
502
        ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
503
        if (!ei)
504
                return NULL;
505
#ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
506
        ei->i_acl = EXT4_ACL_NOT_CACHED;
507
        ei->i_default_acl = EXT4_ACL_NOT_CACHED;
508
#endif
509
        ei->i_block_alloc_info = NULL;
510
        ei->vfs_inode.i_version = 1;
511
        memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache));
512
        return &ei->vfs_inode;
513
}
514
 
515
static void ext4_destroy_inode(struct inode *inode)
516
{
517
        if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
518
                printk("EXT4 Inode %p: orphan list check failed!\n",
519
                        EXT4_I(inode));
520
                print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
521
                                EXT4_I(inode), sizeof(struct ext4_inode_info),
522
                                true);
523
                dump_stack();
524
        }
525
        kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
526
}
527
 
528
static void init_once(struct kmem_cache *cachep, void *foo)
529
{
530
        struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
531
 
532
        INIT_LIST_HEAD(&ei->i_orphan);
533
#ifdef CONFIG_EXT4DEV_FS_XATTR
534
        init_rwsem(&ei->xattr_sem);
535
#endif
536
        mutex_init(&ei->truncate_mutex);
537
        inode_init_once(&ei->vfs_inode);
538
}
539
 
540
static int init_inodecache(void)
541
{
542
        ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
543
                                             sizeof(struct ext4_inode_info),
544
                                             0, (SLAB_RECLAIM_ACCOUNT|
545
                                                SLAB_MEM_SPREAD),
546
                                             init_once);
547
        if (ext4_inode_cachep == NULL)
548
                return -ENOMEM;
549
        return 0;
550
}
551
 
552
static void destroy_inodecache(void)
553
{
554
        kmem_cache_destroy(ext4_inode_cachep);
555
}
556
 
557
static void ext4_clear_inode(struct inode *inode)
558
{
559
        struct ext4_block_alloc_info *rsv = EXT4_I(inode)->i_block_alloc_info;
560
#ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
561
        if (EXT4_I(inode)->i_acl &&
562
                        EXT4_I(inode)->i_acl != EXT4_ACL_NOT_CACHED) {
563
                posix_acl_release(EXT4_I(inode)->i_acl);
564
                EXT4_I(inode)->i_acl = EXT4_ACL_NOT_CACHED;
565
        }
566
        if (EXT4_I(inode)->i_default_acl &&
567
                        EXT4_I(inode)->i_default_acl != EXT4_ACL_NOT_CACHED) {
568
                posix_acl_release(EXT4_I(inode)->i_default_acl);
569
                EXT4_I(inode)->i_default_acl = EXT4_ACL_NOT_CACHED;
570
        }
571
#endif
572
        ext4_discard_reservation(inode);
573
        EXT4_I(inode)->i_block_alloc_info = NULL;
574
        if (unlikely(rsv))
575
                kfree(rsv);
576
}
577
 
578
static inline void ext4_show_quota_options(struct seq_file *seq, struct super_block *sb)
579
{
580
#if defined(CONFIG_QUOTA)
581
        struct ext4_sb_info *sbi = EXT4_SB(sb);
582
 
583
        if (sbi->s_jquota_fmt)
584
                seq_printf(seq, ",jqfmt=%s",
585
                (sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold": "vfsv0");
586
 
587
        if (sbi->s_qf_names[USRQUOTA])
588
                seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
589
 
590
        if (sbi->s_qf_names[GRPQUOTA])
591
                seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
592
 
593
        if (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA)
594
                seq_puts(seq, ",usrquota");
595
 
596
        if (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)
597
                seq_puts(seq, ",grpquota");
598
#endif
599
}
600
 
601
/*
602
 * Show an option if
603
 *  - it's set to a non-default value OR
604
 *  - if the per-sb default is different from the global default
605
 */
606
static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs)
607
{
608
        struct super_block *sb = vfs->mnt_sb;
609
        struct ext4_sb_info *sbi = EXT4_SB(sb);
610
        struct ext4_super_block *es = sbi->s_es;
611
        unsigned long def_mount_opts;
612
 
613
        def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
614
 
615
        if (sbi->s_sb_block != 1)
616
                seq_printf(seq, ",sb=%llu", sbi->s_sb_block);
617
        if (test_opt(sb, MINIX_DF))
618
                seq_puts(seq, ",minixdf");
619
        if (test_opt(sb, GRPID))
620
                seq_puts(seq, ",grpid");
621
        if (!test_opt(sb, GRPID) && (def_mount_opts & EXT4_DEFM_BSDGROUPS))
622
                seq_puts(seq, ",nogrpid");
623
        if (sbi->s_resuid != EXT4_DEF_RESUID ||
624
            le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID) {
625
                seq_printf(seq, ",resuid=%u", sbi->s_resuid);
626
        }
627
        if (sbi->s_resgid != EXT4_DEF_RESGID ||
628
            le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID) {
629
                seq_printf(seq, ",resgid=%u", sbi->s_resgid);
630
        }
631
        if (test_opt(sb, ERRORS_CONT)) {
632
                int def_errors = le16_to_cpu(es->s_errors);
633
 
634
                if (def_errors == EXT4_ERRORS_PANIC ||
635
                    def_errors == EXT4_ERRORS_RO) {
636
                        seq_puts(seq, ",errors=continue");
637
                }
638
        }
639
        if (test_opt(sb, ERRORS_RO))
640
                seq_puts(seq, ",errors=remount-ro");
641
        if (test_opt(sb, ERRORS_PANIC))
642
                seq_puts(seq, ",errors=panic");
643
        if (test_opt(sb, NO_UID32))
644
                seq_puts(seq, ",nouid32");
645
        if (test_opt(sb, DEBUG))
646
                seq_puts(seq, ",debug");
647
        if (test_opt(sb, OLDALLOC))
648
                seq_puts(seq, ",oldalloc");
649
#ifdef CONFIG_EXT4_FS_XATTR
650
        if (test_opt(sb, XATTR_USER))
651
                seq_puts(seq, ",user_xattr");
652
        if (!test_opt(sb, XATTR_USER) &&
653
            (def_mount_opts & EXT4_DEFM_XATTR_USER)) {
654
                seq_puts(seq, ",nouser_xattr");
655
        }
656
#endif
657
#ifdef CONFIG_EXT4_FS_POSIX_ACL
658
        if (test_opt(sb, POSIX_ACL))
659
                seq_puts(seq, ",acl");
660
        if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT4_DEFM_ACL))
661
                seq_puts(seq, ",noacl");
662
#endif
663
        if (!test_opt(sb, RESERVATION))
664
                seq_puts(seq, ",noreservation");
665
        if (sbi->s_commit_interval) {
666
                seq_printf(seq, ",commit=%u",
667
                           (unsigned) (sbi->s_commit_interval / HZ));
668
        }
669
        if (test_opt(sb, BARRIER))
670
                seq_puts(seq, ",barrier=1");
671
        if (test_opt(sb, NOBH))
672
                seq_puts(seq, ",nobh");
673
        if (!test_opt(sb, EXTENTS))
674
                seq_puts(seq, ",noextents");
675
 
676
        if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
677
                seq_puts(seq, ",data=journal");
678
        else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
679
                seq_puts(seq, ",data=ordered");
680
        else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
681
                seq_puts(seq, ",data=writeback");
682
 
683
        ext4_show_quota_options(seq, sb);
684
 
685
        return 0;
686
}
687
 
688
 
689
static struct inode *ext4_nfs_get_inode(struct super_block *sb,
690
                u64 ino, u32 generation)
691
{
692
        struct inode *inode;
693
 
694
        if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
695
                return ERR_PTR(-ESTALE);
696
        if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
697
                return ERR_PTR(-ESTALE);
698
 
699
        /* iget isn't really right if the inode is currently unallocated!!
700
         *
701
         * ext4_read_inode will return a bad_inode if the inode had been
702
         * deleted, so we should be safe.
703
         *
704
         * Currently we don't know the generation for parent directory, so
705
         * a generation of 0 means "accept any"
706
         */
707
        inode = iget(sb, ino);
708
        if (inode == NULL)
709
                return ERR_PTR(-ENOMEM);
710
        if (is_bad_inode(inode) ||
711
            (generation && inode->i_generation != generation)) {
712
                iput(inode);
713
                return ERR_PTR(-ESTALE);
714
        }
715
 
716
        return inode;
717
}
718
 
719
static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
720
                int fh_len, int fh_type)
721
{
722
        return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
723
                                    ext4_nfs_get_inode);
724
}
725
 
726
static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
727
                int fh_len, int fh_type)
728
{
729
        return generic_fh_to_parent(sb, fid, fh_len, fh_type,
730
                                    ext4_nfs_get_inode);
731
}
732
 
733
#ifdef CONFIG_QUOTA
734
#define QTYPE2NAME(t) ((t)==USRQUOTA?"user":"group")
735
#define QTYPE2MOPT(on, t) ((t)==USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
736
 
737
static int ext4_dquot_initialize(struct inode *inode, int type);
738
static int ext4_dquot_drop(struct inode *inode);
739
static int ext4_write_dquot(struct dquot *dquot);
740
static int ext4_acquire_dquot(struct dquot *dquot);
741
static int ext4_release_dquot(struct dquot *dquot);
742
static int ext4_mark_dquot_dirty(struct dquot *dquot);
743
static int ext4_write_info(struct super_block *sb, int type);
744
static int ext4_quota_on(struct super_block *sb, int type, int format_id, char *path);
745
static int ext4_quota_on_mount(struct super_block *sb, int type);
746
static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
747
                               size_t len, loff_t off);
748
static ssize_t ext4_quota_write(struct super_block *sb, int type,
749
                                const char *data, size_t len, loff_t off);
750
 
751
static struct dquot_operations ext4_quota_operations = {
752
        .initialize     = ext4_dquot_initialize,
753
        .drop           = ext4_dquot_drop,
754
        .alloc_space    = dquot_alloc_space,
755
        .alloc_inode    = dquot_alloc_inode,
756
        .free_space     = dquot_free_space,
757
        .free_inode     = dquot_free_inode,
758
        .transfer       = dquot_transfer,
759
        .write_dquot    = ext4_write_dquot,
760
        .acquire_dquot  = ext4_acquire_dquot,
761
        .release_dquot  = ext4_release_dquot,
762
        .mark_dirty     = ext4_mark_dquot_dirty,
763
        .write_info     = ext4_write_info
764
};
765
 
766
static struct quotactl_ops ext4_qctl_operations = {
767
        .quota_on       = ext4_quota_on,
768
        .quota_off      = vfs_quota_off,
769
        .quota_sync     = vfs_quota_sync,
770
        .get_info       = vfs_get_dqinfo,
771
        .set_info       = vfs_set_dqinfo,
772
        .get_dqblk      = vfs_get_dqblk,
773
        .set_dqblk      = vfs_set_dqblk
774
};
775
#endif
776
 
777
static const struct super_operations ext4_sops = {
778
        .alloc_inode    = ext4_alloc_inode,
779
        .destroy_inode  = ext4_destroy_inode,
780
        .read_inode     = ext4_read_inode,
781
        .write_inode    = ext4_write_inode,
782
        .dirty_inode    = ext4_dirty_inode,
783
        .delete_inode   = ext4_delete_inode,
784
        .put_super      = ext4_put_super,
785
        .write_super    = ext4_write_super,
786
        .sync_fs        = ext4_sync_fs,
787
        .write_super_lockfs = ext4_write_super_lockfs,
788
        .unlockfs       = ext4_unlockfs,
789
        .statfs         = ext4_statfs,
790
        .remount_fs     = ext4_remount,
791
        .clear_inode    = ext4_clear_inode,
792
        .show_options   = ext4_show_options,
793
#ifdef CONFIG_QUOTA
794
        .quota_read     = ext4_quota_read,
795
        .quota_write    = ext4_quota_write,
796
#endif
797
};
798
 
799
static const struct export_operations ext4_export_ops = {
800
        .fh_to_dentry = ext4_fh_to_dentry,
801
        .fh_to_parent = ext4_fh_to_parent,
802
        .get_parent = ext4_get_parent,
803
};
804
 
805
enum {
806
        Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
807
        Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
808
        Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
809
        Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
810
        Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh,
811
        Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
812
        Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
813
        Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
814
        Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota,
815
        Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota,
816
        Opt_grpquota, Opt_extents, Opt_noextents,
817
};
818
 
819
static match_table_t tokens = {
820
        {Opt_bsd_df, "bsddf"},
821
        {Opt_minix_df, "minixdf"},
822
        {Opt_grpid, "grpid"},
823
        {Opt_grpid, "bsdgroups"},
824
        {Opt_nogrpid, "nogrpid"},
825
        {Opt_nogrpid, "sysvgroups"},
826
        {Opt_resgid, "resgid=%u"},
827
        {Opt_resuid, "resuid=%u"},
828
        {Opt_sb, "sb=%u"},
829
        {Opt_err_cont, "errors=continue"},
830
        {Opt_err_panic, "errors=panic"},
831
        {Opt_err_ro, "errors=remount-ro"},
832
        {Opt_nouid32, "nouid32"},
833
        {Opt_nocheck, "nocheck"},
834
        {Opt_nocheck, "check=none"},
835
        {Opt_debug, "debug"},
836
        {Opt_oldalloc, "oldalloc"},
837
        {Opt_orlov, "orlov"},
838
        {Opt_user_xattr, "user_xattr"},
839
        {Opt_nouser_xattr, "nouser_xattr"},
840
        {Opt_acl, "acl"},
841
        {Opt_noacl, "noacl"},
842
        {Opt_reservation, "reservation"},
843
        {Opt_noreservation, "noreservation"},
844
        {Opt_noload, "noload"},
845
        {Opt_nobh, "nobh"},
846
        {Opt_bh, "bh"},
847
        {Opt_commit, "commit=%u"},
848
        {Opt_journal_update, "journal=update"},
849
        {Opt_journal_inum, "journal=%u"},
850
        {Opt_journal_dev, "journal_dev=%u"},
851
        {Opt_abort, "abort"},
852
        {Opt_data_journal, "data=journal"},
853
        {Opt_data_ordered, "data=ordered"},
854
        {Opt_data_writeback, "data=writeback"},
855
        {Opt_offusrjquota, "usrjquota="},
856
        {Opt_usrjquota, "usrjquota=%s"},
857
        {Opt_offgrpjquota, "grpjquota="},
858
        {Opt_grpjquota, "grpjquota=%s"},
859
        {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
860
        {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
861
        {Opt_grpquota, "grpquota"},
862
        {Opt_noquota, "noquota"},
863
        {Opt_quota, "quota"},
864
        {Opt_usrquota, "usrquota"},
865
        {Opt_barrier, "barrier=%u"},
866
        {Opt_extents, "extents"},
867
        {Opt_noextents, "noextents"},
868
        {Opt_err, NULL},
869
        {Opt_resize, "resize"},
870
};
871
 
872
static ext4_fsblk_t get_sb_block(void **data)
873
{
874
        ext4_fsblk_t    sb_block;
875
        char            *options = (char *) *data;
876
 
877
        if (!options || strncmp(options, "sb=", 3) != 0)
878
                return 1;       /* Default location */
879
        options += 3;
880
        /*todo: use simple_strtoll with >32bit ext4 */
881
        sb_block = simple_strtoul(options, &options, 0);
882
        if (*options && *options != ',') {
883
                printk("EXT4-fs: Invalid sb specification: %s\n",
884
                       (char *) *data);
885
                return 1;
886
        }
887
        if (*options == ',')
888
                options++;
889
        *data = (void *) options;
890
        return sb_block;
891
}
892
 
893
static int parse_options (char *options, struct super_block *sb,
894
                          unsigned int *inum, unsigned long *journal_devnum,
895
                          ext4_fsblk_t *n_blocks_count, int is_remount)
896
{
897
        struct ext4_sb_info *sbi = EXT4_SB(sb);
898
        char * p;
899
        substring_t args[MAX_OPT_ARGS];
900
        int data_opt = 0;
901
        int option;
902
#ifdef CONFIG_QUOTA
903
        int qtype;
904
        char *qname;
905
#endif
906
 
907
        if (!options)
908
                return 1;
909
 
910
        while ((p = strsep (&options, ",")) != NULL) {
911
                int token;
912
                if (!*p)
913
                        continue;
914
 
915
                token = match_token(p, tokens, args);
916
                switch (token) {
917
                case Opt_bsd_df:
918
                        clear_opt (sbi->s_mount_opt, MINIX_DF);
919
                        break;
920
                case Opt_minix_df:
921
                        set_opt (sbi->s_mount_opt, MINIX_DF);
922
                        break;
923
                case Opt_grpid:
924
                        set_opt (sbi->s_mount_opt, GRPID);
925
                        break;
926
                case Opt_nogrpid:
927
                        clear_opt (sbi->s_mount_opt, GRPID);
928
                        break;
929
                case Opt_resuid:
930
                        if (match_int(&args[0], &option))
931
                                return 0;
932
                        sbi->s_resuid = option;
933
                        break;
934
                case Opt_resgid:
935
                        if (match_int(&args[0], &option))
936
                                return 0;
937
                        sbi->s_resgid = option;
938
                        break;
939
                case Opt_sb:
940
                        /* handled by get_sb_block() instead of here */
941
                        /* *sb_block = match_int(&args[0]); */
942
                        break;
943
                case Opt_err_panic:
944
                        clear_opt (sbi->s_mount_opt, ERRORS_CONT);
945
                        clear_opt (sbi->s_mount_opt, ERRORS_RO);
946
                        set_opt (sbi->s_mount_opt, ERRORS_PANIC);
947
                        break;
948
                case Opt_err_ro:
949
                        clear_opt (sbi->s_mount_opt, ERRORS_CONT);
950
                        clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
951
                        set_opt (sbi->s_mount_opt, ERRORS_RO);
952
                        break;
953
                case Opt_err_cont:
954
                        clear_opt (sbi->s_mount_opt, ERRORS_RO);
955
                        clear_opt (sbi->s_mount_opt, ERRORS_PANIC);
956
                        set_opt (sbi->s_mount_opt, ERRORS_CONT);
957
                        break;
958
                case Opt_nouid32:
959
                        set_opt (sbi->s_mount_opt, NO_UID32);
960
                        break;
961
                case Opt_nocheck:
962
                        clear_opt (sbi->s_mount_opt, CHECK);
963
                        break;
964
                case Opt_debug:
965
                        set_opt (sbi->s_mount_opt, DEBUG);
966
                        break;
967
                case Opt_oldalloc:
968
                        set_opt (sbi->s_mount_opt, OLDALLOC);
969
                        break;
970
                case Opt_orlov:
971
                        clear_opt (sbi->s_mount_opt, OLDALLOC);
972
                        break;
973
#ifdef CONFIG_EXT4DEV_FS_XATTR
974
                case Opt_user_xattr:
975
                        set_opt (sbi->s_mount_opt, XATTR_USER);
976
                        break;
977
                case Opt_nouser_xattr:
978
                        clear_opt (sbi->s_mount_opt, XATTR_USER);
979
                        break;
980
#else
981
                case Opt_user_xattr:
982
                case Opt_nouser_xattr:
983
                        printk("EXT4 (no)user_xattr options not supported\n");
984
                        break;
985
#endif
986
#ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
987
                case Opt_acl:
988
                        set_opt(sbi->s_mount_opt, POSIX_ACL);
989
                        break;
990
                case Opt_noacl:
991
                        clear_opt(sbi->s_mount_opt, POSIX_ACL);
992
                        break;
993
#else
994
                case Opt_acl:
995
                case Opt_noacl:
996
                        printk("EXT4 (no)acl options not supported\n");
997
                        break;
998
#endif
999
                case Opt_reservation:
1000
                        set_opt(sbi->s_mount_opt, RESERVATION);
1001
                        break;
1002
                case Opt_noreservation:
1003
                        clear_opt(sbi->s_mount_opt, RESERVATION);
1004
                        break;
1005
                case Opt_journal_update:
1006
                        /* @@@ FIXME */
1007
                        /* Eventually we will want to be able to create
1008
                           a journal file here.  For now, only allow the
1009
                           user to specify an existing inode to be the
1010
                           journal file. */
1011
                        if (is_remount) {
1012
                                printk(KERN_ERR "EXT4-fs: cannot specify "
1013
                                       "journal on remount\n");
1014
                                return 0;
1015
                        }
1016
                        set_opt (sbi->s_mount_opt, UPDATE_JOURNAL);
1017
                        break;
1018
                case Opt_journal_inum:
1019
                        if (is_remount) {
1020
                                printk(KERN_ERR "EXT4-fs: cannot specify "
1021
                                       "journal on remount\n");
1022
                                return 0;
1023
                        }
1024
                        if (match_int(&args[0], &option))
1025
                                return 0;
1026
                        *inum = option;
1027
                        break;
1028
                case Opt_journal_dev:
1029
                        if (is_remount) {
1030
                                printk(KERN_ERR "EXT4-fs: cannot specify "
1031
                                       "journal on remount\n");
1032
                                return 0;
1033
                        }
1034
                        if (match_int(&args[0], &option))
1035
                                return 0;
1036
                        *journal_devnum = option;
1037
                        break;
1038
                case Opt_noload:
1039
                        set_opt (sbi->s_mount_opt, NOLOAD);
1040
                        break;
1041
                case Opt_commit:
1042
                        if (match_int(&args[0], &option))
1043
                                return 0;
1044
                        if (option < 0)
1045
                                return 0;
1046
                        if (option == 0)
1047
                                option = JBD2_DEFAULT_MAX_COMMIT_AGE;
1048
                        sbi->s_commit_interval = HZ * option;
1049
                        break;
1050
                case Opt_data_journal:
1051
                        data_opt = EXT4_MOUNT_JOURNAL_DATA;
1052
                        goto datacheck;
1053
                case Opt_data_ordered:
1054
                        data_opt = EXT4_MOUNT_ORDERED_DATA;
1055
                        goto datacheck;
1056
                case Opt_data_writeback:
1057
                        data_opt = EXT4_MOUNT_WRITEBACK_DATA;
1058
                datacheck:
1059
                        if (is_remount) {
1060
                                if ((sbi->s_mount_opt & EXT4_MOUNT_DATA_FLAGS)
1061
                                                != data_opt) {
1062
                                        printk(KERN_ERR
1063
                                                "EXT4-fs: cannot change data "
1064
                                                "mode on remount\n");
1065
                                        return 0;
1066
                                }
1067
                        } else {
1068
                                sbi->s_mount_opt &= ~EXT4_MOUNT_DATA_FLAGS;
1069
                                sbi->s_mount_opt |= data_opt;
1070
                        }
1071
                        break;
1072
#ifdef CONFIG_QUOTA
1073
                case Opt_usrjquota:
1074
                        qtype = USRQUOTA;
1075
                        goto set_qf_name;
1076
                case Opt_grpjquota:
1077
                        qtype = GRPQUOTA;
1078
set_qf_name:
1079
                        if (sb_any_quota_enabled(sb)) {
1080
                                printk(KERN_ERR
1081
                                        "EXT4-fs: Cannot change journalled "
1082
                                        "quota options when quota turned on.\n");
1083
                                return 0;
1084
                        }
1085
                        qname = match_strdup(&args[0]);
1086
                        if (!qname) {
1087
                                printk(KERN_ERR
1088
                                        "EXT4-fs: not enough memory for "
1089
                                        "storing quotafile name.\n");
1090
                                return 0;
1091
                        }
1092
                        if (sbi->s_qf_names[qtype] &&
1093
                            strcmp(sbi->s_qf_names[qtype], qname)) {
1094
                                printk(KERN_ERR
1095
                                        "EXT4-fs: %s quota file already "
1096
                                        "specified.\n", QTYPE2NAME(qtype));
1097
                                kfree(qname);
1098
                                return 0;
1099
                        }
1100
                        sbi->s_qf_names[qtype] = qname;
1101
                        if (strchr(sbi->s_qf_names[qtype], '/')) {
1102
                                printk(KERN_ERR
1103
                                        "EXT4-fs: quotafile must be on "
1104
                                        "filesystem root.\n");
1105
                                kfree(sbi->s_qf_names[qtype]);
1106
                                sbi->s_qf_names[qtype] = NULL;
1107
                                return 0;
1108
                        }
1109
                        set_opt(sbi->s_mount_opt, QUOTA);
1110
                        break;
1111
                case Opt_offusrjquota:
1112
                        qtype = USRQUOTA;
1113
                        goto clear_qf_name;
1114
                case Opt_offgrpjquota:
1115
                        qtype = GRPQUOTA;
1116
clear_qf_name:
1117
                        if (sb_any_quota_enabled(sb)) {
1118
                                printk(KERN_ERR "EXT4-fs: Cannot change "
1119
                                        "journalled quota options when "
1120
                                        "quota turned on.\n");
1121
                                return 0;
1122
                        }
1123
                        /*
1124
                         * The space will be released later when all options
1125
                         * are confirmed to be correct
1126
                         */
1127
                        sbi->s_qf_names[qtype] = NULL;
1128
                        break;
1129
                case Opt_jqfmt_vfsold:
1130
                        sbi->s_jquota_fmt = QFMT_VFS_OLD;
1131
                        break;
1132
                case Opt_jqfmt_vfsv0:
1133
                        sbi->s_jquota_fmt = QFMT_VFS_V0;
1134
                        break;
1135
                case Opt_quota:
1136
                case Opt_usrquota:
1137
                        set_opt(sbi->s_mount_opt, QUOTA);
1138
                        set_opt(sbi->s_mount_opt, USRQUOTA);
1139
                        break;
1140
                case Opt_grpquota:
1141
                        set_opt(sbi->s_mount_opt, QUOTA);
1142
                        set_opt(sbi->s_mount_opt, GRPQUOTA);
1143
                        break;
1144
                case Opt_noquota:
1145
                        if (sb_any_quota_enabled(sb)) {
1146
                                printk(KERN_ERR "EXT4-fs: Cannot change quota "
1147
                                        "options when quota turned on.\n");
1148
                                return 0;
1149
                        }
1150
                        clear_opt(sbi->s_mount_opt, QUOTA);
1151
                        clear_opt(sbi->s_mount_opt, USRQUOTA);
1152
                        clear_opt(sbi->s_mount_opt, GRPQUOTA);
1153
                        break;
1154
#else
1155
                case Opt_quota:
1156
                case Opt_usrquota:
1157
                case Opt_grpquota:
1158
                case Opt_usrjquota:
1159
                case Opt_grpjquota:
1160
                case Opt_offusrjquota:
1161
                case Opt_offgrpjquota:
1162
                case Opt_jqfmt_vfsold:
1163
                case Opt_jqfmt_vfsv0:
1164
                        printk(KERN_ERR
1165
                                "EXT4-fs: journalled quota options not "
1166
                                "supported.\n");
1167
                        break;
1168
                case Opt_noquota:
1169
                        break;
1170
#endif
1171
                case Opt_abort:
1172
                        set_opt(sbi->s_mount_opt, ABORT);
1173
                        break;
1174
                case Opt_barrier:
1175
                        if (match_int(&args[0], &option))
1176
                                return 0;
1177
                        if (option)
1178
                                set_opt(sbi->s_mount_opt, BARRIER);
1179
                        else
1180
                                clear_opt(sbi->s_mount_opt, BARRIER);
1181
                        break;
1182
                case Opt_ignore:
1183
                        break;
1184
                case Opt_resize:
1185
                        if (!is_remount) {
1186
                                printk("EXT4-fs: resize option only available "
1187
                                        "for remount\n");
1188
                                return 0;
1189
                        }
1190
                        if (match_int(&args[0], &option) != 0)
1191
                                return 0;
1192
                        *n_blocks_count = option;
1193
                        break;
1194
                case Opt_nobh:
1195
                        set_opt(sbi->s_mount_opt, NOBH);
1196
                        break;
1197
                case Opt_bh:
1198
                        clear_opt(sbi->s_mount_opt, NOBH);
1199
                        break;
1200
                case Opt_extents:
1201
                        set_opt (sbi->s_mount_opt, EXTENTS);
1202
                        break;
1203
                case Opt_noextents:
1204
                        clear_opt (sbi->s_mount_opt, EXTENTS);
1205
                        break;
1206
                default:
1207
                        printk (KERN_ERR
1208
                                "EXT4-fs: Unrecognized mount option \"%s\" "
1209
                                "or missing value\n", p);
1210
                        return 0;
1211
                }
1212
        }
1213
#ifdef CONFIG_QUOTA
1214
        if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1215
                if ((sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA) &&
1216
                     sbi->s_qf_names[USRQUOTA])
1217
                        clear_opt(sbi->s_mount_opt, USRQUOTA);
1218
 
1219
                if ((sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA) &&
1220
                     sbi->s_qf_names[GRPQUOTA])
1221
                        clear_opt(sbi->s_mount_opt, GRPQUOTA);
1222
 
1223
                if ((sbi->s_qf_names[USRQUOTA] &&
1224
                                (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)) ||
1225
                    (sbi->s_qf_names[GRPQUOTA] &&
1226
                                (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA))) {
1227
                        printk(KERN_ERR "EXT4-fs: old and new quota "
1228
                                        "format mixing.\n");
1229
                        return 0;
1230
                }
1231
 
1232
                if (!sbi->s_jquota_fmt) {
1233
                        printk(KERN_ERR "EXT4-fs: journalled quota format "
1234
                                        "not specified.\n");
1235
                        return 0;
1236
                }
1237
        } else {
1238
                if (sbi->s_jquota_fmt) {
1239
                        printk(KERN_ERR "EXT4-fs: journalled quota format "
1240
                                        "specified with no journalling "
1241
                                        "enabled.\n");
1242
                        return 0;
1243
                }
1244
        }
1245
#endif
1246
        return 1;
1247
}
1248
 
1249
static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
1250
                            int read_only)
1251
{
1252
        struct ext4_sb_info *sbi = EXT4_SB(sb);
1253
        int res = 0;
1254
 
1255
        if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
1256
                printk (KERN_ERR "EXT4-fs warning: revision level too high, "
1257
                        "forcing read-only mode\n");
1258
                res = MS_RDONLY;
1259
        }
1260
        if (read_only)
1261
                return res;
1262
        if (!(sbi->s_mount_state & EXT4_VALID_FS))
1263
                printk (KERN_WARNING "EXT4-fs warning: mounting unchecked fs, "
1264
                        "running e2fsck is recommended\n");
1265
        else if ((sbi->s_mount_state & EXT4_ERROR_FS))
1266
                printk (KERN_WARNING
1267
                        "EXT4-fs warning: mounting fs with errors, "
1268
                        "running e2fsck is recommended\n");
1269
        else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
1270
                 le16_to_cpu(es->s_mnt_count) >=
1271
                 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
1272
                printk (KERN_WARNING
1273
                        "EXT4-fs warning: maximal mount count reached, "
1274
                        "running e2fsck is recommended\n");
1275
        else if (le32_to_cpu(es->s_checkinterval) &&
1276
                (le32_to_cpu(es->s_lastcheck) +
1277
                        le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1278
                printk (KERN_WARNING
1279
                        "EXT4-fs warning: checktime reached, "
1280
                        "running e2fsck is recommended\n");
1281
#if 0
1282
                /* @@@ We _will_ want to clear the valid bit if we find
1283
                 * inconsistencies, to force a fsck at reboot.  But for
1284
                 * a plain journaled filesystem we can keep it set as
1285
                 * valid forever! :)
1286
                 */
1287
        es->s_state = cpu_to_le16(le16_to_cpu(es->s_state) & ~EXT4_VALID_FS);
1288
#endif
1289
        if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
1290
                es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
1291
        es->s_mnt_count=cpu_to_le16(le16_to_cpu(es->s_mnt_count) + 1);
1292
        es->s_mtime = cpu_to_le32(get_seconds());
1293
        ext4_update_dynamic_rev(sb);
1294
        EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
1295
 
1296
        ext4_commit_super(sb, es, 1);
1297
        if (test_opt(sb, DEBUG))
1298
                printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%lu, "
1299
                                "bpg=%lu, ipg=%lu, mo=%04lx]\n",
1300
                        sb->s_blocksize,
1301
                        sbi->s_groups_count,
1302
                        EXT4_BLOCKS_PER_GROUP(sb),
1303
                        EXT4_INODES_PER_GROUP(sb),
1304
                        sbi->s_mount_opt);
1305
 
1306
        printk(KERN_INFO "EXT4 FS on %s, ", sb->s_id);
1307
        if (EXT4_SB(sb)->s_journal->j_inode == NULL) {
1308
                char b[BDEVNAME_SIZE];
1309
 
1310
                printk("external journal on %s\n",
1311
                        bdevname(EXT4_SB(sb)->s_journal->j_dev, b));
1312
        } else {
1313
                printk("internal journal\n");
1314
        }
1315
        return res;
1316
}
1317
 
1318
__le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
1319
                            struct ext4_group_desc *gdp)
1320
{
1321
        __u16 crc = 0;
1322
 
1323
        if (sbi->s_es->s_feature_ro_compat &
1324
            cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) {
1325
                int offset = offsetof(struct ext4_group_desc, bg_checksum);
1326
                __le32 le_group = cpu_to_le32(block_group);
1327
 
1328
                crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
1329
                crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
1330
                crc = crc16(crc, (__u8 *)gdp, offset);
1331
                offset += sizeof(gdp->bg_checksum); /* skip checksum */
1332
                /* for checksum of struct ext4_group_desc do the rest...*/
1333
                if ((sbi->s_es->s_feature_incompat &
1334
                     cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) &&
1335
                    offset < le16_to_cpu(sbi->s_es->s_desc_size))
1336
                        crc = crc16(crc, (__u8 *)gdp + offset,
1337
                                    le16_to_cpu(sbi->s_es->s_desc_size) -
1338
                                        offset);
1339
        }
1340
 
1341
        return cpu_to_le16(crc);
1342
}
1343
 
1344
int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 block_group,
1345
                                struct ext4_group_desc *gdp)
1346
{
1347
        if ((sbi->s_es->s_feature_ro_compat &
1348
             cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) &&
1349
            (gdp->bg_checksum != ext4_group_desc_csum(sbi, block_group, gdp)))
1350
                return 0;
1351
 
1352
        return 1;
1353
}
1354
 
1355
/* Called at mount-time, super-block is locked */
1356
static int ext4_check_descriptors (struct super_block * sb)
1357
{
1358
        struct ext4_sb_info *sbi = EXT4_SB(sb);
1359
        ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
1360
        ext4_fsblk_t last_block;
1361
        ext4_fsblk_t block_bitmap;
1362
        ext4_fsblk_t inode_bitmap;
1363
        ext4_fsblk_t inode_table;
1364
        struct ext4_group_desc * gdp = NULL;
1365
        int desc_block = 0;
1366
        int flexbg_flag = 0;
1367
        int i;
1368
 
1369
        if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
1370
                flexbg_flag = 1;
1371
 
1372
        ext4_debug ("Checking group descriptors");
1373
 
1374
        for (i = 0; i < sbi->s_groups_count; i++)
1375
        {
1376
                if (i == sbi->s_groups_count - 1 || flexbg_flag)
1377
                        last_block = ext4_blocks_count(sbi->s_es) - 1;
1378
                else
1379
                        last_block = first_block +
1380
                                (EXT4_BLOCKS_PER_GROUP(sb) - 1);
1381
 
1382
                if ((i % EXT4_DESC_PER_BLOCK(sb)) == 0)
1383
                        gdp = (struct ext4_group_desc *)
1384
                                        sbi->s_group_desc[desc_block++]->b_data;
1385
                block_bitmap = ext4_block_bitmap(sb, gdp);
1386
                if (block_bitmap < first_block || block_bitmap > last_block)
1387
                {
1388
                        ext4_error (sb, "ext4_check_descriptors",
1389
                                    "Block bitmap for group %d"
1390
                                    " not in group (block %llu)!",
1391
                                    i, block_bitmap);
1392
                        return 0;
1393
                }
1394
                inode_bitmap = ext4_inode_bitmap(sb, gdp);
1395
                if (inode_bitmap < first_block || inode_bitmap > last_block)
1396
                {
1397
                        ext4_error (sb, "ext4_check_descriptors",
1398
                                    "Inode bitmap for group %d"
1399
                                    " not in group (block %llu)!",
1400
                                    i, inode_bitmap);
1401
                        return 0;
1402
                }
1403
                inode_table = ext4_inode_table(sb, gdp);
1404
                if (inode_table < first_block ||
1405
                    inode_table + sbi->s_itb_per_group - 1 > last_block)
1406
                {
1407
                        ext4_error (sb, "ext4_check_descriptors",
1408
                                    "Inode table for group %d"
1409
                                    " not in group (block %llu)!",
1410
                                    i, inode_table);
1411
                        return 0;
1412
                }
1413
                if (!ext4_group_desc_csum_verify(sbi, i, gdp)) {
1414
                        ext4_error(sb, __FUNCTION__,
1415
                                   "Checksum for group %d failed (%u!=%u)\n", i,
1416
                                   le16_to_cpu(ext4_group_desc_csum(sbi, i,
1417
                                                                    gdp)),
1418
                                   le16_to_cpu(gdp->bg_checksum));
1419
                        return 0;
1420
                }
1421
                if (!flexbg_flag)
1422
                        first_block += EXT4_BLOCKS_PER_GROUP(sb);
1423
                gdp = (struct ext4_group_desc *)
1424
                        ((__u8 *)gdp + EXT4_DESC_SIZE(sb));
1425
        }
1426
 
1427
        ext4_free_blocks_count_set(sbi->s_es, ext4_count_free_blocks(sb));
1428
        sbi->s_es->s_free_inodes_count=cpu_to_le32(ext4_count_free_inodes(sb));
1429
        return 1;
1430
}
1431
 
1432
 
1433
/* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
1434
 * the superblock) which were deleted from all directories, but held open by
1435
 * a process at the time of a crash.  We walk the list and try to delete these
1436
 * inodes at recovery time (only with a read-write filesystem).
1437
 *
1438
 * In order to keep the orphan inode chain consistent during traversal (in
1439
 * case of crash during recovery), we link each inode into the superblock
1440
 * orphan list_head and handle it the same way as an inode deletion during
1441
 * normal operation (which journals the operations for us).
1442
 *
1443
 * We only do an iget() and an iput() on each inode, which is very safe if we
1444
 * accidentally point at an in-use or already deleted inode.  The worst that
1445
 * can happen in this case is that we get a "bit already cleared" message from
1446
 * ext4_free_inode().  The only reason we would point at a wrong inode is if
1447
 * e2fsck was run on this filesystem, and it must have already done the orphan
1448
 * inode cleanup for us, so we can safely abort without any further action.
1449
 */
1450
static void ext4_orphan_cleanup (struct super_block * sb,
1451
                                 struct ext4_super_block * es)
1452
{
1453
        unsigned int s_flags = sb->s_flags;
1454
        int nr_orphans = 0, nr_truncates = 0;
1455
#ifdef CONFIG_QUOTA
1456
        int i;
1457
#endif
1458
        if (!es->s_last_orphan) {
1459
                jbd_debug(4, "no orphan inodes to clean up\n");
1460
                return;
1461
        }
1462
 
1463
        if (bdev_read_only(sb->s_bdev)) {
1464
                printk(KERN_ERR "EXT4-fs: write access "
1465
                        "unavailable, skipping orphan cleanup.\n");
1466
                return;
1467
        }
1468
 
1469
        if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
1470
                if (es->s_last_orphan)
1471
                        jbd_debug(1, "Errors on filesystem, "
1472
                                  "clearing orphan list.\n");
1473
                es->s_last_orphan = 0;
1474
                jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1475
                return;
1476
        }
1477
 
1478
        if (s_flags & MS_RDONLY) {
1479
                printk(KERN_INFO "EXT4-fs: %s: orphan cleanup on readonly fs\n",
1480
                       sb->s_id);
1481
                sb->s_flags &= ~MS_RDONLY;
1482
        }
1483
#ifdef CONFIG_QUOTA
1484
        /* Needed for iput() to work correctly and not trash data */
1485
        sb->s_flags |= MS_ACTIVE;
1486
        /* Turn on quotas so that they are updated correctly */
1487
        for (i = 0; i < MAXQUOTAS; i++) {
1488
                if (EXT4_SB(sb)->s_qf_names[i]) {
1489
                        int ret = ext4_quota_on_mount(sb, i);
1490
                        if (ret < 0)
1491
                                printk(KERN_ERR
1492
                                        "EXT4-fs: Cannot turn on journalled "
1493
                                        "quota: error %d\n", ret);
1494
                }
1495
        }
1496
#endif
1497
 
1498
        while (es->s_last_orphan) {
1499
                struct inode *inode;
1500
 
1501
                if (!(inode =
1502
                      ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan)))) {
1503
                        es->s_last_orphan = 0;
1504
                        break;
1505
                }
1506
 
1507
                list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
1508
                DQUOT_INIT(inode);
1509
                if (inode->i_nlink) {
1510
                        printk(KERN_DEBUG
1511
                                "%s: truncating inode %lu to %Ld bytes\n",
1512
                                __FUNCTION__, inode->i_ino, inode->i_size);
1513
                        jbd_debug(2, "truncating inode %lu to %Ld bytes\n",
1514
                                  inode->i_ino, inode->i_size);
1515
                        ext4_truncate(inode);
1516
                        nr_truncates++;
1517
                } else {
1518
                        printk(KERN_DEBUG
1519
                                "%s: deleting unreferenced inode %lu\n",
1520
                                __FUNCTION__, inode->i_ino);
1521
                        jbd_debug(2, "deleting unreferenced inode %lu\n",
1522
                                  inode->i_ino);
1523
                        nr_orphans++;
1524
                }
1525
                iput(inode);  /* The delete magic happens here! */
1526
        }
1527
 
1528
#define PLURAL(x) (x), ((x)==1) ? "" : "s"
1529
 
1530
        if (nr_orphans)
1531
                printk(KERN_INFO "EXT4-fs: %s: %d orphan inode%s deleted\n",
1532
                       sb->s_id, PLURAL(nr_orphans));
1533
        if (nr_truncates)
1534
                printk(KERN_INFO "EXT4-fs: %s: %d truncate%s cleaned up\n",
1535
                       sb->s_id, PLURAL(nr_truncates));
1536
#ifdef CONFIG_QUOTA
1537
        /* Turn quotas off */
1538
        for (i = 0; i < MAXQUOTAS; i++) {
1539
                if (sb_dqopt(sb)->files[i])
1540
                        vfs_quota_off(sb, i);
1541
        }
1542
#endif
1543
        sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1544
}
1545
 
1546
/*
1547
 * Maximal file size.  There is a direct, and {,double-,triple-}indirect
1548
 * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks.
1549
 * We need to be 1 filesystem block less than the 2^32 sector limit.
1550
 */
1551
static loff_t ext4_max_size(int bits)
1552
{
1553
        loff_t res = EXT4_NDIR_BLOCKS;
1554
        /* This constant is calculated to be the largest file size for a
1555
         * dense, 4k-blocksize file such that the total number of
1556
         * sectors in the file, including data and all indirect blocks,
1557
         * does not exceed 2^32. */
1558
        const loff_t upper_limit = 0x1ff7fffd000LL;
1559
 
1560
        res += 1LL << (bits-2);
1561
        res += 1LL << (2*(bits-2));
1562
        res += 1LL << (3*(bits-2));
1563
        res <<= bits;
1564
        if (res > upper_limit)
1565
                res = upper_limit;
1566
        return res;
1567
}
1568
 
1569
static ext4_fsblk_t descriptor_loc(struct super_block *sb,
1570
                                ext4_fsblk_t logical_sb_block, int nr)
1571
{
1572
        struct ext4_sb_info *sbi = EXT4_SB(sb);
1573
        unsigned long bg, first_meta_bg;
1574
        int has_super = 0;
1575
 
1576
        first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1577
 
1578
        if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
1579
            nr < first_meta_bg)
1580
                return logical_sb_block + nr + 1;
1581
        bg = sbi->s_desc_per_block * nr;
1582
        if (ext4_bg_has_super(sb, bg))
1583
                has_super = 1;
1584
        return (has_super + ext4_group_first_block_no(sb, bg));
1585
}
1586
 
1587
 
1588
static int ext4_fill_super (struct super_block *sb, void *data, int silent)
1589
{
1590
        struct buffer_head * bh;
1591
        struct ext4_super_block *es = NULL;
1592
        struct ext4_sb_info *sbi;
1593
        ext4_fsblk_t block;
1594
        ext4_fsblk_t sb_block = get_sb_block(&data);
1595
        ext4_fsblk_t logical_sb_block;
1596
        unsigned long offset = 0;
1597
        unsigned int journal_inum = 0;
1598
        unsigned long journal_devnum = 0;
1599
        unsigned long def_mount_opts;
1600
        struct inode *root;
1601
        int blocksize;
1602
        int hblock;
1603
        int db_count;
1604
        int i;
1605
        int needs_recovery;
1606
        __le32 features;
1607
        __u64 blocks_count;
1608
        int err;
1609
 
1610
        sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
1611
        if (!sbi)
1612
                return -ENOMEM;
1613
        sb->s_fs_info = sbi;
1614
        sbi->s_mount_opt = 0;
1615
        sbi->s_resuid = EXT4_DEF_RESUID;
1616
        sbi->s_resgid = EXT4_DEF_RESGID;
1617
        sbi->s_sb_block = sb_block;
1618
 
1619
        unlock_kernel();
1620
 
1621
        blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
1622
        if (!blocksize) {
1623
                printk(KERN_ERR "EXT4-fs: unable to set blocksize\n");
1624
                goto out_fail;
1625
        }
1626
 
1627
        /*
1628
         * The ext4 superblock will not be buffer aligned for other than 1kB
1629
         * block sizes.  We need to calculate the offset from buffer start.
1630
         */
1631
        if (blocksize != EXT4_MIN_BLOCK_SIZE) {
1632
                logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
1633
                offset = do_div(logical_sb_block, blocksize);
1634
        } else {
1635
                logical_sb_block = sb_block;
1636
        }
1637
 
1638
        if (!(bh = sb_bread(sb, logical_sb_block))) {
1639
                printk (KERN_ERR "EXT4-fs: unable to read superblock\n");
1640
                goto out_fail;
1641
        }
1642
        /*
1643
         * Note: s_es must be initialized as soon as possible because
1644
         *       some ext4 macro-instructions depend on its value
1645
         */
1646
        es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
1647
        sbi->s_es = es;
1648
        sb->s_magic = le16_to_cpu(es->s_magic);
1649
        if (sb->s_magic != EXT4_SUPER_MAGIC)
1650
                goto cantfind_ext4;
1651
 
1652
        /* Set defaults before we parse the mount options */
1653
        def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
1654
        if (def_mount_opts & EXT4_DEFM_DEBUG)
1655
                set_opt(sbi->s_mount_opt, DEBUG);
1656
        if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
1657
                set_opt(sbi->s_mount_opt, GRPID);
1658
        if (def_mount_opts & EXT4_DEFM_UID16)
1659
                set_opt(sbi->s_mount_opt, NO_UID32);
1660
#ifdef CONFIG_EXT4DEV_FS_XATTR
1661
        if (def_mount_opts & EXT4_DEFM_XATTR_USER)
1662
                set_opt(sbi->s_mount_opt, XATTR_USER);
1663
#endif
1664
#ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
1665
        if (def_mount_opts & EXT4_DEFM_ACL)
1666
                set_opt(sbi->s_mount_opt, POSIX_ACL);
1667
#endif
1668
        if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
1669
                sbi->s_mount_opt |= EXT4_MOUNT_JOURNAL_DATA;
1670
        else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
1671
                sbi->s_mount_opt |= EXT4_MOUNT_ORDERED_DATA;
1672
        else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
1673
                sbi->s_mount_opt |= EXT4_MOUNT_WRITEBACK_DATA;
1674
 
1675
        if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
1676
                set_opt(sbi->s_mount_opt, ERRORS_PANIC);
1677
        else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_RO)
1678
                set_opt(sbi->s_mount_opt, ERRORS_RO);
1679
        else
1680
                set_opt(sbi->s_mount_opt, ERRORS_CONT);
1681
 
1682
        sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
1683
        sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
1684
 
1685
        set_opt(sbi->s_mount_opt, RESERVATION);
1686
 
1687
        /*
1688
         * turn on extents feature by default in ext4 filesystem
1689
         * User -o noextents to turn it off
1690
         */
1691
        set_opt(sbi->s_mount_opt, EXTENTS);
1692
 
1693
        if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
1694
                            NULL, 0))
1695
                goto failed_mount;
1696
 
1697
        sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1698
                ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
1699
 
1700
        if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
1701
            (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
1702
             EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
1703
             EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
1704
                printk(KERN_WARNING
1705
                       "EXT4-fs warning: feature flags set on rev 0 fs, "
1706
                       "running e2fsck is recommended\n");
1707
        /*
1708
         * Check feature flags regardless of the revision level, since we
1709
         * previously didn't change the revision level when setting the flags,
1710
         * so there is a chance incompat flags are set on a rev 0 filesystem.
1711
         */
1712
        features = EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP);
1713
        if (features) {
1714
                printk(KERN_ERR "EXT4-fs: %s: couldn't mount because of "
1715
                       "unsupported optional features (%x).\n",
1716
                       sb->s_id, le32_to_cpu(features));
1717
                goto failed_mount;
1718
        }
1719
        features = EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP);
1720
        if (!(sb->s_flags & MS_RDONLY) && features) {
1721
                printk(KERN_ERR "EXT4-fs: %s: couldn't mount RDWR because of "
1722
                       "unsupported optional features (%x).\n",
1723
                       sb->s_id, le32_to_cpu(features));
1724
                goto failed_mount;
1725
        }
1726
        blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
1727
 
1728
        if (blocksize < EXT4_MIN_BLOCK_SIZE ||
1729
            blocksize > EXT4_MAX_BLOCK_SIZE) {
1730
                printk(KERN_ERR
1731
                       "EXT4-fs: Unsupported filesystem blocksize %d on %s.\n",
1732
                       blocksize, sb->s_id);
1733
                goto failed_mount;
1734
        }
1735
 
1736
        hblock = bdev_hardsect_size(sb->s_bdev);
1737
        if (sb->s_blocksize != blocksize) {
1738
                /*
1739
                 * Make sure the blocksize for the filesystem is larger
1740
                 * than the hardware sectorsize for the machine.
1741
                 */
1742
                if (blocksize < hblock) {
1743
                        printk(KERN_ERR "EXT4-fs: blocksize %d too small for "
1744
                               "device blocksize %d.\n", blocksize, hblock);
1745
                        goto failed_mount;
1746
                }
1747
 
1748
                brelse (bh);
1749
                sb_set_blocksize(sb, blocksize);
1750
                logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
1751
                offset = do_div(logical_sb_block, blocksize);
1752
                bh = sb_bread(sb, logical_sb_block);
1753
                if (!bh) {
1754
                        printk(KERN_ERR
1755
                               "EXT4-fs: Can't read superblock on 2nd try.\n");
1756
                        goto failed_mount;
1757
                }
1758
                es = (struct ext4_super_block *)(((char *)bh->b_data) + offset);
1759
                sbi->s_es = es;
1760
                if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
1761
                        printk (KERN_ERR
1762
                                "EXT4-fs: Magic mismatch, very weird !\n");
1763
                        goto failed_mount;
1764
                }
1765
        }
1766
 
1767
        sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits);
1768
 
1769
        if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
1770
                sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
1771
                sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
1772
        } else {
1773
                sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
1774
                sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
1775
                if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
1776
                    (!is_power_of_2(sbi->s_inode_size)) ||
1777
                    (sbi->s_inode_size > blocksize)) {
1778
                        printk (KERN_ERR
1779
                                "EXT4-fs: unsupported inode size: %d\n",
1780
                                sbi->s_inode_size);
1781
                        goto failed_mount;
1782
                }
1783
                if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
1784
                        sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
1785
        }
1786
        sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
1787
        if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
1788
                if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
1789
                    sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
1790
                    !is_power_of_2(sbi->s_desc_size)) {
1791
                        printk(KERN_ERR
1792
                               "EXT4-fs: unsupported descriptor size %lu\n",
1793
                               sbi->s_desc_size);
1794
                        goto failed_mount;
1795
                }
1796
        } else
1797
                sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
1798
        sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
1799
        sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
1800
        if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
1801
                goto cantfind_ext4;
1802
        sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
1803
        if (sbi->s_inodes_per_block == 0)
1804
                goto cantfind_ext4;
1805
        sbi->s_itb_per_group = sbi->s_inodes_per_group /
1806
                                        sbi->s_inodes_per_block;
1807
        sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
1808
        sbi->s_sbh = bh;
1809
        sbi->s_mount_state = le16_to_cpu(es->s_state);
1810
        sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
1811
        sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
1812
        for (i=0; i < 4; i++)
1813
                sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
1814
        sbi->s_def_hash_version = es->s_def_hash_version;
1815
 
1816
        if (sbi->s_blocks_per_group > blocksize * 8) {
1817
                printk (KERN_ERR
1818
                        "EXT4-fs: #blocks per group too big: %lu\n",
1819
                        sbi->s_blocks_per_group);
1820
                goto failed_mount;
1821
        }
1822
        if (sbi->s_inodes_per_group > blocksize * 8) {
1823
                printk (KERN_ERR
1824
                        "EXT4-fs: #inodes per group too big: %lu\n",
1825
                        sbi->s_inodes_per_group);
1826
                goto failed_mount;
1827
        }
1828
 
1829
        if (ext4_blocks_count(es) >
1830
                    (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) {
1831
                printk(KERN_ERR "EXT4-fs: filesystem on %s:"
1832
                        " too large to mount safely\n", sb->s_id);
1833
                if (sizeof(sector_t) < 8)
1834
                        printk(KERN_WARNING "EXT4-fs: CONFIG_LBD not "
1835
                                        "enabled\n");
1836
                goto failed_mount;
1837
        }
1838
 
1839
        if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
1840
                goto cantfind_ext4;
1841
        blocks_count = (ext4_blocks_count(es) -
1842
                        le32_to_cpu(es->s_first_data_block) +
1843
                        EXT4_BLOCKS_PER_GROUP(sb) - 1);
1844
        do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
1845
        sbi->s_groups_count = blocks_count;
1846
        db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
1847
                   EXT4_DESC_PER_BLOCK(sb);
1848
        sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
1849
                                    GFP_KERNEL);
1850
        if (sbi->s_group_desc == NULL) {
1851
                printk (KERN_ERR "EXT4-fs: not enough memory\n");
1852
                goto failed_mount;
1853
        }
1854
 
1855
        bgl_lock_init(&sbi->s_blockgroup_lock);
1856
 
1857
        for (i = 0; i < db_count; i++) {
1858
                block = descriptor_loc(sb, logical_sb_block, i);
1859
                sbi->s_group_desc[i] = sb_bread(sb, block);
1860
                if (!sbi->s_group_desc[i]) {
1861
                        printk (KERN_ERR "EXT4-fs: "
1862
                                "can't read group descriptor %d\n", i);
1863
                        db_count = i;
1864
                        goto failed_mount2;
1865
                }
1866
        }
1867
        if (!ext4_check_descriptors (sb)) {
1868
                printk(KERN_ERR "EXT4-fs: group descriptors corrupted!\n");
1869
                goto failed_mount2;
1870
        }
1871
        sbi->s_gdb_count = db_count;
1872
        get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1873
        spin_lock_init(&sbi->s_next_gen_lock);
1874
 
1875
        err = percpu_counter_init(&sbi->s_freeblocks_counter,
1876
                        ext4_count_free_blocks(sb));
1877
        if (!err) {
1878
                err = percpu_counter_init(&sbi->s_freeinodes_counter,
1879
                                ext4_count_free_inodes(sb));
1880
        }
1881
        if (!err) {
1882
                err = percpu_counter_init(&sbi->s_dirs_counter,
1883
                                ext4_count_dirs(sb));
1884
        }
1885
        if (err) {
1886
                printk(KERN_ERR "EXT4-fs: insufficient memory\n");
1887
                goto failed_mount3;
1888
        }
1889
 
1890
        /* per fileystem reservation list head & lock */
1891
        spin_lock_init(&sbi->s_rsv_window_lock);
1892
        sbi->s_rsv_window_root = RB_ROOT;
1893
        /* Add a single, static dummy reservation to the start of the
1894
         * reservation window list --- it gives us a placeholder for
1895
         * append-at-start-of-list which makes the allocation logic
1896
         * _much_ simpler. */
1897
        sbi->s_rsv_window_head.rsv_start = EXT4_RESERVE_WINDOW_NOT_ALLOCATED;
1898
        sbi->s_rsv_window_head.rsv_end = EXT4_RESERVE_WINDOW_NOT_ALLOCATED;
1899
        sbi->s_rsv_window_head.rsv_alloc_hit = 0;
1900
        sbi->s_rsv_window_head.rsv_goal_size = 0;
1901
        ext4_rsv_window_add(sb, &sbi->s_rsv_window_head);
1902
 
1903
        /*
1904
         * set up enough so that it can read an inode
1905
         */
1906
        sb->s_op = &ext4_sops;
1907
        sb->s_export_op = &ext4_export_ops;
1908
        sb->s_xattr = ext4_xattr_handlers;
1909
#ifdef CONFIG_QUOTA
1910
        sb->s_qcop = &ext4_qctl_operations;
1911
        sb->dq_op = &ext4_quota_operations;
1912
#endif
1913
        INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
1914
 
1915
        sb->s_root = NULL;
1916
 
1917
        needs_recovery = (es->s_last_orphan != 0 ||
1918
                          EXT4_HAS_INCOMPAT_FEATURE(sb,
1919
                                    EXT4_FEATURE_INCOMPAT_RECOVER));
1920
 
1921
        /*
1922
         * The first inode we look at is the journal inode.  Don't try
1923
         * root first: it may be modified in the journal!
1924
         */
1925
        if (!test_opt(sb, NOLOAD) &&
1926
            EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
1927
                if (ext4_load_journal(sb, es, journal_devnum))
1928
                        goto failed_mount3;
1929
        } else if (journal_inum) {
1930
                if (ext4_create_journal(sb, es, journal_inum))
1931
                        goto failed_mount3;
1932
        } else {
1933
                if (!silent)
1934
                        printk (KERN_ERR
1935
                                "ext4: No journal on filesystem on %s\n",
1936
                                sb->s_id);
1937
                goto failed_mount3;
1938
        }
1939
 
1940
        if (ext4_blocks_count(es) > 0xffffffffULL &&
1941
            !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
1942
                                       JBD2_FEATURE_INCOMPAT_64BIT)) {
1943
                printk(KERN_ERR "ext4: Failed to set 64-bit journal feature\n");
1944
                goto failed_mount4;
1945
        }
1946
 
1947
        /* We have now updated the journal if required, so we can
1948
         * validate the data journaling mode. */
1949
        switch (test_opt(sb, DATA_FLAGS)) {
1950
        case 0:
1951
                /* No mode set, assume a default based on the journal
1952
                 * capabilities: ORDERED_DATA if the journal can
1953
                 * cope, else JOURNAL_DATA
1954
                 */
1955
                if (jbd2_journal_check_available_features
1956
                    (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
1957
                        set_opt(sbi->s_mount_opt, ORDERED_DATA);
1958
                else
1959
                        set_opt(sbi->s_mount_opt, JOURNAL_DATA);
1960
                break;
1961
 
1962
        case EXT4_MOUNT_ORDERED_DATA:
1963
        case EXT4_MOUNT_WRITEBACK_DATA:
1964
                if (!jbd2_journal_check_available_features
1965
                    (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
1966
                        printk(KERN_ERR "EXT4-fs: Journal does not support "
1967
                               "requested data journaling mode\n");
1968
                        goto failed_mount4;
1969
                }
1970
        default:
1971
                break;
1972
        }
1973
 
1974
        if (test_opt(sb, NOBH)) {
1975
                if (!(test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)) {
1976
                        printk(KERN_WARNING "EXT4-fs: Ignoring nobh option - "
1977
                                "its supported only with writeback mode\n");
1978
                        clear_opt(sbi->s_mount_opt, NOBH);
1979
                }
1980
        }
1981
        /*
1982
         * The jbd2_journal_load will have done any necessary log recovery,
1983
         * so we can safely mount the rest of the filesystem now.
1984
         */
1985
 
1986
        root = iget(sb, EXT4_ROOT_INO);
1987
        sb->s_root = d_alloc_root(root);
1988
        if (!sb->s_root) {
1989
                printk(KERN_ERR "EXT4-fs: get root inode failed\n");
1990
                iput(root);
1991
                goto failed_mount4;
1992
        }
1993
        if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1994
                dput(sb->s_root);
1995
                sb->s_root = NULL;
1996
                printk(KERN_ERR "EXT4-fs: corrupt root inode, run e2fsck\n");
1997
                goto failed_mount4;
1998
        }
1999
 
2000
        ext4_setup_super (sb, es, sb->s_flags & MS_RDONLY);
2001
 
2002
        /* determine the minimum size of new large inodes, if present */
2003
        if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
2004
                sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
2005
                                                     EXT4_GOOD_OLD_INODE_SIZE;
2006
                if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
2007
                                       EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) {
2008
                        if (sbi->s_want_extra_isize <
2009
                            le16_to_cpu(es->s_want_extra_isize))
2010
                                sbi->s_want_extra_isize =
2011
                                        le16_to_cpu(es->s_want_extra_isize);
2012
                        if (sbi->s_want_extra_isize <
2013
                            le16_to_cpu(es->s_min_extra_isize))
2014
                                sbi->s_want_extra_isize =
2015
                                        le16_to_cpu(es->s_min_extra_isize);
2016
                }
2017
        }
2018
        /* Check if enough inode space is available */
2019
        if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
2020
                                                        sbi->s_inode_size) {
2021
                sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
2022
                                                       EXT4_GOOD_OLD_INODE_SIZE;
2023
                printk(KERN_INFO "EXT4-fs: required extra inode space not"
2024
                        "available.\n");
2025
        }
2026
 
2027
        /*
2028
         * akpm: core read_super() calls in here with the superblock locked.
2029
         * That deadlocks, because orphan cleanup needs to lock the superblock
2030
         * in numerous places.  Here we just pop the lock - it's relatively
2031
         * harmless, because we are now ready to accept write_super() requests,
2032
         * and aviro says that's the only reason for hanging onto the
2033
         * superblock lock.
2034
         */
2035
        EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
2036
        ext4_orphan_cleanup(sb, es);
2037
        EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
2038
        if (needs_recovery)
2039
                printk (KERN_INFO "EXT4-fs: recovery complete.\n");
2040
        ext4_mark_recovery_complete(sb, es);
2041
        printk (KERN_INFO "EXT4-fs: mounted filesystem with %s data mode.\n",
2042
                test_opt(sb,DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA ? "journal":
2043
                test_opt(sb,DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA ? "ordered":
2044
                "writeback");
2045
 
2046
        ext4_ext_init(sb);
2047
 
2048
        lock_kernel();
2049
        return 0;
2050
 
2051
cantfind_ext4:
2052
        if (!silent)
2053
                printk(KERN_ERR "VFS: Can't find ext4 filesystem on dev %s.\n",
2054
                       sb->s_id);
2055
        goto failed_mount;
2056
 
2057
failed_mount4:
2058
        jbd2_journal_destroy(sbi->s_journal);
2059
failed_mount3:
2060
        percpu_counter_destroy(&sbi->s_freeblocks_counter);
2061
        percpu_counter_destroy(&sbi->s_freeinodes_counter);
2062
        percpu_counter_destroy(&sbi->s_dirs_counter);
2063
failed_mount2:
2064
        for (i = 0; i < db_count; i++)
2065
                brelse(sbi->s_group_desc[i]);
2066
        kfree(sbi->s_group_desc);
2067
failed_mount:
2068
#ifdef CONFIG_QUOTA
2069
        for (i = 0; i < MAXQUOTAS; i++)
2070
                kfree(sbi->s_qf_names[i]);
2071
#endif
2072
        ext4_blkdev_remove(sbi);
2073
        brelse(bh);
2074
out_fail:
2075
        sb->s_fs_info = NULL;
2076
        kfree(sbi);
2077
        lock_kernel();
2078
        return -EINVAL;
2079
}
2080
 
2081
/*
2082
 * Setup any per-fs journal parameters now.  We'll do this both on
2083
 * initial mount, once the journal has been initialised but before we've
2084
 * done any recovery; and again on any subsequent remount.
2085
 */
2086
static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
2087
{
2088
        struct ext4_sb_info *sbi = EXT4_SB(sb);
2089
 
2090
        if (sbi->s_commit_interval)
2091
                journal->j_commit_interval = sbi->s_commit_interval;
2092
        /* We could also set up an ext4-specific default for the commit
2093
         * interval here, but for now we'll just fall back to the jbd
2094
         * default. */
2095
 
2096
        spin_lock(&journal->j_state_lock);
2097
        if (test_opt(sb, BARRIER))
2098
                journal->j_flags |= JBD2_BARRIER;
2099
        else
2100
                journal->j_flags &= ~JBD2_BARRIER;
2101
        spin_unlock(&journal->j_state_lock);
2102
}
2103
 
2104
static journal_t *ext4_get_journal(struct super_block *sb,
2105
                                   unsigned int journal_inum)
2106
{
2107
        struct inode *journal_inode;
2108
        journal_t *journal;
2109
 
2110
        /* First, test for the existence of a valid inode on disk.  Bad
2111
         * things happen if we iget() an unused inode, as the subsequent
2112
         * iput() will try to delete it. */
2113
 
2114
        journal_inode = iget(sb, journal_inum);
2115
        if (!journal_inode) {
2116
                printk(KERN_ERR "EXT4-fs: no journal found.\n");
2117
                return NULL;
2118
        }
2119
        if (!journal_inode->i_nlink) {
2120
                make_bad_inode(journal_inode);
2121
                iput(journal_inode);
2122
                printk(KERN_ERR "EXT4-fs: journal inode is deleted.\n");
2123
                return NULL;
2124
        }
2125
 
2126
        jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
2127
                  journal_inode, journal_inode->i_size);
2128
        if (is_bad_inode(journal_inode) || !S_ISREG(journal_inode->i_mode)) {
2129
                printk(KERN_ERR "EXT4-fs: invalid journal inode.\n");
2130
                iput(journal_inode);
2131
                return NULL;
2132
        }
2133
 
2134
        journal = jbd2_journal_init_inode(journal_inode);
2135
        if (!journal) {
2136
                printk(KERN_ERR "EXT4-fs: Could not load journal inode\n");
2137
                iput(journal_inode);
2138
                return NULL;
2139
        }
2140
        journal->j_private = sb;
2141
        ext4_init_journal_params(sb, journal);
2142
        return journal;
2143
}
2144
 
2145
static journal_t *ext4_get_dev_journal(struct super_block *sb,
2146
                                       dev_t j_dev)
2147
{
2148
        struct buffer_head * bh;
2149
        journal_t *journal;
2150
        ext4_fsblk_t start;
2151
        ext4_fsblk_t len;
2152
        int hblock, blocksize;
2153
        ext4_fsblk_t sb_block;
2154
        unsigned long offset;
2155
        struct ext4_super_block * es;
2156
        struct block_device *bdev;
2157
 
2158
        bdev = ext4_blkdev_get(j_dev);
2159
        if (bdev == NULL)
2160
                return NULL;
2161
 
2162
        if (bd_claim(bdev, sb)) {
2163
                printk(KERN_ERR
2164
                        "EXT4: failed to claim external journal device.\n");
2165
                blkdev_put(bdev);
2166
                return NULL;
2167
        }
2168
 
2169
        blocksize = sb->s_blocksize;
2170
        hblock = bdev_hardsect_size(bdev);
2171
        if (blocksize < hblock) {
2172
                printk(KERN_ERR
2173
                        "EXT4-fs: blocksize too small for journal device.\n");
2174
                goto out_bdev;
2175
        }
2176
 
2177
        sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
2178
        offset = EXT4_MIN_BLOCK_SIZE % blocksize;
2179
        set_blocksize(bdev, blocksize);
2180
        if (!(bh = __bread(bdev, sb_block, blocksize))) {
2181
                printk(KERN_ERR "EXT4-fs: couldn't read superblock of "
2182
                       "external journal\n");
2183
                goto out_bdev;
2184
        }
2185
 
2186
        es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
2187
        if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
2188
            !(le32_to_cpu(es->s_feature_incompat) &
2189
              EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
2190
                printk(KERN_ERR "EXT4-fs: external journal has "
2191
                                        "bad superblock\n");
2192
                brelse(bh);
2193
                goto out_bdev;
2194
        }
2195
 
2196
        if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
2197
                printk(KERN_ERR "EXT4-fs: journal UUID does not match\n");
2198
                brelse(bh);
2199
                goto out_bdev;
2200
        }
2201
 
2202
        len = ext4_blocks_count(es);
2203
        start = sb_block + 1;
2204
        brelse(bh);     /* we're done with the superblock */
2205
 
2206
        journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
2207
                                        start, len, blocksize);
2208
        if (!journal) {
2209
                printk(KERN_ERR "EXT4-fs: failed to create device journal\n");
2210
                goto out_bdev;
2211
        }
2212
        journal->j_private = sb;
2213
        ll_rw_block(READ, 1, &journal->j_sb_buffer);
2214
        wait_on_buffer(journal->j_sb_buffer);
2215
        if (!buffer_uptodate(journal->j_sb_buffer)) {
2216
                printk(KERN_ERR "EXT4-fs: I/O error on journal device\n");
2217
                goto out_journal;
2218
        }
2219
        if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
2220
                printk(KERN_ERR "EXT4-fs: External journal has more than one "
2221
                                        "user (unsupported) - %d\n",
2222
                        be32_to_cpu(journal->j_superblock->s_nr_users));
2223
                goto out_journal;
2224
        }
2225
        EXT4_SB(sb)->journal_bdev = bdev;
2226
        ext4_init_journal_params(sb, journal);
2227
        return journal;
2228
out_journal:
2229
        jbd2_journal_destroy(journal);
2230
out_bdev:
2231
        ext4_blkdev_put(bdev);
2232
        return NULL;
2233
}
2234
 
2235
static int ext4_load_journal(struct super_block *sb,
2236
                             struct ext4_super_block *es,
2237
                             unsigned long journal_devnum)
2238
{
2239
        journal_t *journal;
2240
        unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
2241
        dev_t journal_dev;
2242
        int err = 0;
2243
        int really_read_only;
2244
 
2245
        if (journal_devnum &&
2246
            journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2247
                printk(KERN_INFO "EXT4-fs: external journal device major/minor "
2248
                        "numbers have changed\n");
2249
                journal_dev = new_decode_dev(journal_devnum);
2250
        } else
2251
                journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
2252
 
2253
        really_read_only = bdev_read_only(sb->s_bdev);
2254
 
2255
        /*
2256
         * Are we loading a blank journal or performing recovery after a
2257
         * crash?  For recovery, we need to check in advance whether we
2258
         * can get read-write access to the device.
2259
         */
2260
 
2261
        if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
2262
                if (sb->s_flags & MS_RDONLY) {
2263
                        printk(KERN_INFO "EXT4-fs: INFO: recovery "
2264
                                        "required on readonly filesystem.\n");
2265
                        if (really_read_only) {
2266
                                printk(KERN_ERR "EXT4-fs: write access "
2267
                                        "unavailable, cannot proceed.\n");
2268
                                return -EROFS;
2269
                        }
2270
                        printk (KERN_INFO "EXT4-fs: write access will "
2271
                                        "be enabled during recovery.\n");
2272
                }
2273
        }
2274
 
2275
        if (journal_inum && journal_dev) {
2276
                printk(KERN_ERR "EXT4-fs: filesystem has both journal "
2277
                       "and inode journals!\n");
2278
                return -EINVAL;
2279
        }
2280
 
2281
        if (journal_inum) {
2282
                if (!(journal = ext4_get_journal(sb, journal_inum)))
2283
                        return -EINVAL;
2284
        } else {
2285
                if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
2286
                        return -EINVAL;
2287
        }
2288
 
2289
        if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
2290
                err = jbd2_journal_update_format(journal);
2291
                if (err)  {
2292
                        printk(KERN_ERR "EXT4-fs: error updating journal.\n");
2293
                        jbd2_journal_destroy(journal);
2294
                        return err;
2295
                }
2296
        }
2297
 
2298
        if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
2299
                err = jbd2_journal_wipe(journal, !really_read_only);
2300
        if (!err)
2301
                err = jbd2_journal_load(journal);
2302
 
2303
        if (err) {
2304
                printk(KERN_ERR "EXT4-fs: error loading journal.\n");
2305
                jbd2_journal_destroy(journal);
2306
                return err;
2307
        }
2308
 
2309
        EXT4_SB(sb)->s_journal = journal;
2310
        ext4_clear_journal_err(sb, es);
2311
 
2312
        if (journal_devnum &&
2313
            journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2314
                es->s_journal_dev = cpu_to_le32(journal_devnum);
2315
                sb->s_dirt = 1;
2316
 
2317
                /* Make sure we flush the recovery flag to disk. */
2318
                ext4_commit_super(sb, es, 1);
2319
        }
2320
 
2321
        return 0;
2322
}
2323
 
2324
static int ext4_create_journal(struct super_block * sb,
2325
                               struct ext4_super_block * es,
2326
                               unsigned int journal_inum)
2327
{
2328
        journal_t *journal;
2329
        int err;
2330
 
2331
        if (sb->s_flags & MS_RDONLY) {
2332
                printk(KERN_ERR "EXT4-fs: readonly filesystem when trying to "
2333
                                "create journal.\n");
2334
                return -EROFS;
2335
        }
2336
 
2337
        journal = ext4_get_journal(sb, journal_inum);
2338
        if (!journal)
2339
                return -EINVAL;
2340
 
2341
        printk(KERN_INFO "EXT4-fs: creating new journal on inode %u\n",
2342
               journal_inum);
2343
 
2344
        err = jbd2_journal_create(journal);
2345
        if (err) {
2346
                printk(KERN_ERR "EXT4-fs: error creating journal.\n");
2347
                jbd2_journal_destroy(journal);
2348
                return -EIO;
2349
        }
2350
 
2351
        EXT4_SB(sb)->s_journal = journal;
2352
 
2353
        ext4_update_dynamic_rev(sb);
2354
        EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2355
        EXT4_SET_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL);
2356
 
2357
        es->s_journal_inum = cpu_to_le32(journal_inum);
2358
        sb->s_dirt = 1;
2359
 
2360
        /* Make sure we flush the recovery flag to disk. */
2361
        ext4_commit_super(sb, es, 1);
2362
 
2363
        return 0;
2364
}
2365
 
2366
static void ext4_commit_super (struct super_block * sb,
2367
                               struct ext4_super_block * es,
2368
                               int sync)
2369
{
2370
        struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
2371
 
2372
        if (!sbh)
2373
                return;
2374
        es->s_wtime = cpu_to_le32(get_seconds());
2375
        ext4_free_blocks_count_set(es, ext4_count_free_blocks(sb));
2376
        es->s_free_inodes_count = cpu_to_le32(ext4_count_free_inodes(sb));
2377
        BUFFER_TRACE(sbh, "marking dirty");
2378
        mark_buffer_dirty(sbh);
2379
        if (sync)
2380
                sync_dirty_buffer(sbh);
2381
}
2382
 
2383
 
2384
/*
2385
 * Have we just finished recovery?  If so, and if we are mounting (or
2386
 * remounting) the filesystem readonly, then we will end up with a
2387
 * consistent fs on disk.  Record that fact.
2388
 */
2389
static void ext4_mark_recovery_complete(struct super_block * sb,
2390
                                        struct ext4_super_block * es)
2391
{
2392
        journal_t *journal = EXT4_SB(sb)->s_journal;
2393
 
2394
        jbd2_journal_lock_updates(journal);
2395
        jbd2_journal_flush(journal);
2396
        lock_super(sb);
2397
        if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
2398
            sb->s_flags & MS_RDONLY) {
2399
                EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2400
                sb->s_dirt = 0;
2401
                ext4_commit_super(sb, es, 1);
2402
        }
2403
        unlock_super(sb);
2404
        jbd2_journal_unlock_updates(journal);
2405
}
2406
 
2407
/*
2408
 * If we are mounting (or read-write remounting) a filesystem whose journal
2409
 * has recorded an error from a previous lifetime, move that error to the
2410
 * main filesystem now.
2411
 */
2412
static void ext4_clear_journal_err(struct super_block * sb,
2413
                                   struct ext4_super_block * es)
2414
{
2415
        journal_t *journal;
2416
        int j_errno;
2417
        const char *errstr;
2418
 
2419
        journal = EXT4_SB(sb)->s_journal;
2420
 
2421
        /*
2422
         * Now check for any error status which may have been recorded in the
2423
         * journal by a prior ext4_error() or ext4_abort()
2424
         */
2425
 
2426
        j_errno = jbd2_journal_errno(journal);
2427
        if (j_errno) {
2428
                char nbuf[16];
2429
 
2430
                errstr = ext4_decode_error(sb, j_errno, nbuf);
2431
                ext4_warning(sb, __FUNCTION__, "Filesystem error recorded "
2432
                             "from previous mount: %s", errstr);
2433
                ext4_warning(sb, __FUNCTION__, "Marking fs in need of "
2434
                             "filesystem check.");
2435
 
2436
                EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
2437
                es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
2438
                ext4_commit_super (sb, es, 1);
2439
 
2440
                jbd2_journal_clear_err(journal);
2441
        }
2442
}
2443
 
2444
/*
2445
 * Force the running and committing transactions to commit,
2446
 * and wait on the commit.
2447
 */
2448
int ext4_force_commit(struct super_block *sb)
2449
{
2450
        journal_t *journal;
2451
        int ret;
2452
 
2453
        if (sb->s_flags & MS_RDONLY)
2454
                return 0;
2455
 
2456
        journal = EXT4_SB(sb)->s_journal;
2457
        sb->s_dirt = 0;
2458
        ret = ext4_journal_force_commit(journal);
2459
        return ret;
2460
}
2461
 
2462
/*
2463
 * Ext4 always journals updates to the superblock itself, so we don't
2464
 * have to propagate any other updates to the superblock on disk at this
2465
 * point.  Just start an async writeback to get the buffers on their way
2466
 * to the disk.
2467
 *
2468
 * This implicitly triggers the writebehind on sync().
2469
 */
2470
 
2471
static void ext4_write_super (struct super_block * sb)
2472
{
2473
        if (mutex_trylock(&sb->s_lock) != 0)
2474
                BUG();
2475
        sb->s_dirt = 0;
2476
}
2477
 
2478
static int ext4_sync_fs(struct super_block *sb, int wait)
2479
{
2480
        tid_t target;
2481
 
2482
        sb->s_dirt = 0;
2483
        if (jbd2_journal_start_commit(EXT4_SB(sb)->s_journal, &target)) {
2484
                if (wait)
2485
                        jbd2_log_wait_commit(EXT4_SB(sb)->s_journal, target);
2486
        }
2487
        return 0;
2488
}
2489
 
2490
/*
2491
 * LVM calls this function before a (read-only) snapshot is created.  This
2492
 * gives us a chance to flush the journal completely and mark the fs clean.
2493
 */
2494
static void ext4_write_super_lockfs(struct super_block *sb)
2495
{
2496
        sb->s_dirt = 0;
2497
 
2498
        if (!(sb->s_flags & MS_RDONLY)) {
2499
                journal_t *journal = EXT4_SB(sb)->s_journal;
2500
 
2501
                /* Now we set up the journal barrier. */
2502
                jbd2_journal_lock_updates(journal);
2503
                jbd2_journal_flush(journal);
2504
 
2505
                /* Journal blocked and flushed, clear needs_recovery flag. */
2506
                EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2507
                ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1);
2508
        }
2509
}
2510
 
2511
/*
2512
 * Called by LVM after the snapshot is done.  We need to reset the RECOVER
2513
 * flag here, even though the filesystem is not technically dirty yet.
2514
 */
2515
static void ext4_unlockfs(struct super_block *sb)
2516
{
2517
        if (!(sb->s_flags & MS_RDONLY)) {
2518
                lock_super(sb);
2519
                /* Reser the needs_recovery flag before the fs is unlocked. */
2520
                EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2521
                ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1);
2522
                unlock_super(sb);
2523
                jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
2524
        }
2525
}
2526
 
2527
static int ext4_remount (struct super_block * sb, int * flags, char * data)
2528
{
2529
        struct ext4_super_block * es;
2530
        struct ext4_sb_info *sbi = EXT4_SB(sb);
2531
        ext4_fsblk_t n_blocks_count = 0;
2532
        unsigned long old_sb_flags;
2533
        struct ext4_mount_options old_opts;
2534
        int err;
2535
#ifdef CONFIG_QUOTA
2536
        int i;
2537
#endif
2538
 
2539
        /* Store the original options */
2540
        old_sb_flags = sb->s_flags;
2541
        old_opts.s_mount_opt = sbi->s_mount_opt;
2542
        old_opts.s_resuid = sbi->s_resuid;
2543
        old_opts.s_resgid = sbi->s_resgid;
2544
        old_opts.s_commit_interval = sbi->s_commit_interval;
2545
#ifdef CONFIG_QUOTA
2546
        old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
2547
        for (i = 0; i < MAXQUOTAS; i++)
2548
                old_opts.s_qf_names[i] = sbi->s_qf_names[i];
2549
#endif
2550
 
2551
        /*
2552
         * Allow the "check" option to be passed as a remount option.
2553
         */
2554
        if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
2555
                err = -EINVAL;
2556
                goto restore_opts;
2557
        }
2558
 
2559
        if (sbi->s_mount_opt & EXT4_MOUNT_ABORT)
2560
                ext4_abort(sb, __FUNCTION__, "Abort forced by user");
2561
 
2562
        sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
2563
                ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
2564
 
2565
        es = sbi->s_es;
2566
 
2567
        ext4_init_journal_params(sb, sbi->s_journal);
2568
 
2569
        if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
2570
                n_blocks_count > ext4_blocks_count(es)) {
2571
                if (sbi->s_mount_opt & EXT4_MOUNT_ABORT) {
2572
                        err = -EROFS;
2573
                        goto restore_opts;
2574
                }
2575
 
2576
                if (*flags & MS_RDONLY) {
2577
                        /*
2578
                         * First of all, the unconditional stuff we have to do
2579
                         * to disable replay of the journal when we next remount
2580
                         */
2581
                        sb->s_flags |= MS_RDONLY;
2582
 
2583
                        /*
2584
                         * OK, test if we are remounting a valid rw partition
2585
                         * readonly, and if so set the rdonly flag and then
2586
                         * mark the partition as valid again.
2587
                         */
2588
                        if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
2589
                            (sbi->s_mount_state & EXT4_VALID_FS))
2590
                                es->s_state = cpu_to_le16(sbi->s_mount_state);
2591
 
2592
                        /*
2593
                         * We have to unlock super so that we can wait for
2594
                         * transactions.
2595
                         */
2596
                        unlock_super(sb);
2597
                        ext4_mark_recovery_complete(sb, es);
2598
                        lock_super(sb);
2599
                } else {
2600
                        __le32 ret;
2601
                        if ((ret = EXT4_HAS_RO_COMPAT_FEATURE(sb,
2602
                                        ~EXT4_FEATURE_RO_COMPAT_SUPP))) {
2603
                                printk(KERN_WARNING "EXT4-fs: %s: couldn't "
2604
                                       "remount RDWR because of unsupported "
2605
                                       "optional features (%x).\n",
2606
                                       sb->s_id, le32_to_cpu(ret));
2607
                                err = -EROFS;
2608
                                goto restore_opts;
2609
                        }
2610
 
2611
                        /*
2612
                         * If we have an unprocessed orphan list hanging
2613
                         * around from a previously readonly bdev mount,
2614
                         * require a full umount/remount for now.
2615
                         */
2616
                        if (es->s_last_orphan) {
2617
                                printk(KERN_WARNING "EXT4-fs: %s: couldn't "
2618
                                       "remount RDWR because of unprocessed "
2619
                                       "orphan inode list.  Please "
2620
                                       "umount/remount instead.\n",
2621
                                       sb->s_id);
2622
                                err = -EINVAL;
2623
                                goto restore_opts;
2624
                        }
2625
 
2626
                        /*
2627
                         * Mounting a RDONLY partition read-write, so reread
2628
                         * and store the current valid flag.  (It may have
2629
                         * been changed by e2fsck since we originally mounted
2630
                         * the partition.)
2631
                         */
2632
                        ext4_clear_journal_err(sb, es);
2633
                        sbi->s_mount_state = le16_to_cpu(es->s_state);
2634
                        if ((err = ext4_group_extend(sb, es, n_blocks_count)))
2635
                                goto restore_opts;
2636
                        if (!ext4_setup_super (sb, es, 0))
2637
                                sb->s_flags &= ~MS_RDONLY;
2638
                }
2639
        }
2640
#ifdef CONFIG_QUOTA
2641
        /* Release old quota file names */
2642
        for (i = 0; i < MAXQUOTAS; i++)
2643
                if (old_opts.s_qf_names[i] &&
2644
                    old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2645
                        kfree(old_opts.s_qf_names[i]);
2646
#endif
2647
        return 0;
2648
restore_opts:
2649
        sb->s_flags = old_sb_flags;
2650
        sbi->s_mount_opt = old_opts.s_mount_opt;
2651
        sbi->s_resuid = old_opts.s_resuid;
2652
        sbi->s_resgid = old_opts.s_resgid;
2653
        sbi->s_commit_interval = old_opts.s_commit_interval;
2654
#ifdef CONFIG_QUOTA
2655
        sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
2656
        for (i = 0; i < MAXQUOTAS; i++) {
2657
                if (sbi->s_qf_names[i] &&
2658
                    old_opts.s_qf_names[i] != sbi->s_qf_names[i])
2659
                        kfree(sbi->s_qf_names[i]);
2660
                sbi->s_qf_names[i] = old_opts.s_qf_names[i];
2661
        }
2662
#endif
2663
        return err;
2664
}
2665
 
2666
static int ext4_statfs (struct dentry * dentry, struct kstatfs * buf)
2667
{
2668
        struct super_block *sb = dentry->d_sb;
2669
        struct ext4_sb_info *sbi = EXT4_SB(sb);
2670
        struct ext4_super_block *es = sbi->s_es;
2671
        u64 fsid;
2672
 
2673
        if (test_opt(sb, MINIX_DF)) {
2674
                sbi->s_overhead_last = 0;
2675
        } else if (sbi->s_blocks_last != ext4_blocks_count(es)) {
2676
                unsigned long ngroups = sbi->s_groups_count, i;
2677
                ext4_fsblk_t overhead = 0;
2678
                smp_rmb();
2679
 
2680
                /*
2681
                 * Compute the overhead (FS structures).  This is constant
2682
                 * for a given filesystem unless the number of block groups
2683
                 * changes so we cache the previous value until it does.
2684
                 */
2685
 
2686
                /*
2687
                 * All of the blocks before first_data_block are
2688
                 * overhead
2689
                 */
2690
                overhead = le32_to_cpu(es->s_first_data_block);
2691
 
2692
                /*
2693
                 * Add the overhead attributed to the superblock and
2694
                 * block group descriptors.  If the sparse superblocks
2695
                 * feature is turned on, then not all groups have this.
2696
                 */
2697
                for (i = 0; i < ngroups; i++) {
2698
                        overhead += ext4_bg_has_super(sb, i) +
2699
                                ext4_bg_num_gdb(sb, i);
2700
                        cond_resched();
2701
                }
2702
 
2703
                /*
2704
                 * Every block group has an inode bitmap, a block
2705
                 * bitmap, and an inode table.
2706
                 */
2707
                overhead += ngroups * (2 + sbi->s_itb_per_group);
2708
                sbi->s_overhead_last = overhead;
2709
                smp_wmb();
2710
                sbi->s_blocks_last = ext4_blocks_count(es);
2711
        }
2712
 
2713
        buf->f_type = EXT4_SUPER_MAGIC;
2714
        buf->f_bsize = sb->s_blocksize;
2715
        buf->f_blocks = ext4_blocks_count(es) - sbi->s_overhead_last;
2716
        buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter);
2717
        ext4_free_blocks_count_set(es, buf->f_bfree);
2718
        buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es);
2719
        if (buf->f_bfree < ext4_r_blocks_count(es))
2720
                buf->f_bavail = 0;
2721
        buf->f_files = le32_to_cpu(es->s_inodes_count);
2722
        buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
2723
        es->s_free_inodes_count = cpu_to_le32(buf->f_ffree);
2724
        buf->f_namelen = EXT4_NAME_LEN;
2725
        fsid = le64_to_cpup((void *)es->s_uuid) ^
2726
               le64_to_cpup((void *)es->s_uuid + sizeof(u64));
2727
        buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
2728
        buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
2729
        return 0;
2730
}
2731
 
2732
/* Helper function for writing quotas on sync - we need to start transaction before quota file
2733
 * is locked for write. Otherwise the are possible deadlocks:
2734
 * Process 1                         Process 2
2735
 * ext4_create()                     quota_sync()
2736
 *   jbd2_journal_start()                   write_dquot()
2737
 *   DQUOT_INIT()                        down(dqio_mutex)
2738
 *     down(dqio_mutex)                    jbd2_journal_start()
2739
 *
2740
 */
2741
 
2742
#ifdef CONFIG_QUOTA
2743
 
2744
static inline struct inode *dquot_to_inode(struct dquot *dquot)
2745
{
2746
        return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
2747
}
2748
 
2749
static int ext4_dquot_initialize(struct inode *inode, int type)
2750
{
2751
        handle_t *handle;
2752
        int ret, err;
2753
 
2754
        /* We may create quota structure so we need to reserve enough blocks */
2755
        handle = ext4_journal_start(inode, 2*EXT4_QUOTA_INIT_BLOCKS(inode->i_sb));
2756
        if (IS_ERR(handle))
2757
                return PTR_ERR(handle);
2758
        ret = dquot_initialize(inode, type);
2759
        err = ext4_journal_stop(handle);
2760
        if (!ret)
2761
                ret = err;
2762
        return ret;
2763
}
2764
 
2765
static int ext4_dquot_drop(struct inode *inode)
2766
{
2767
        handle_t *handle;
2768
        int ret, err;
2769
 
2770
        /* We may delete quota structure so we need to reserve enough blocks */
2771
        handle = ext4_journal_start(inode, 2*EXT4_QUOTA_DEL_BLOCKS(inode->i_sb));
2772
        if (IS_ERR(handle))
2773
                return PTR_ERR(handle);
2774
        ret = dquot_drop(inode);
2775
        err = ext4_journal_stop(handle);
2776
        if (!ret)
2777
                ret = err;
2778
        return ret;
2779
}
2780
 
2781
static int ext4_write_dquot(struct dquot *dquot)
2782
{
2783
        int ret, err;
2784
        handle_t *handle;
2785
        struct inode *inode;
2786
 
2787
        inode = dquot_to_inode(dquot);
2788
        handle = ext4_journal_start(inode,
2789
                                        EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
2790
        if (IS_ERR(handle))
2791
                return PTR_ERR(handle);
2792
        ret = dquot_commit(dquot);
2793
        err = ext4_journal_stop(handle);
2794
        if (!ret)
2795
                ret = err;
2796
        return ret;
2797
}
2798
 
2799
static int ext4_acquire_dquot(struct dquot *dquot)
2800
{
2801
        int ret, err;
2802
        handle_t *handle;
2803
 
2804
        handle = ext4_journal_start(dquot_to_inode(dquot),
2805
                                        EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
2806
        if (IS_ERR(handle))
2807
                return PTR_ERR(handle);
2808
        ret = dquot_acquire(dquot);
2809
        err = ext4_journal_stop(handle);
2810
        if (!ret)
2811
                ret = err;
2812
        return ret;
2813
}
2814
 
2815
static int ext4_release_dquot(struct dquot *dquot)
2816
{
2817
        int ret, err;
2818
        handle_t *handle;
2819
 
2820
        handle = ext4_journal_start(dquot_to_inode(dquot),
2821
                                        EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
2822
        if (IS_ERR(handle)) {
2823
                /* Release dquot anyway to avoid endless cycle in dqput() */
2824
                dquot_release(dquot);
2825
                return PTR_ERR(handle);
2826
        }
2827
        ret = dquot_release(dquot);
2828
        err = ext4_journal_stop(handle);
2829
        if (!ret)
2830
                ret = err;
2831
        return ret;
2832
}
2833
 
2834
static int ext4_mark_dquot_dirty(struct dquot *dquot)
2835
{
2836
        /* Are we journalling quotas? */
2837
        if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
2838
            EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
2839
                dquot_mark_dquot_dirty(dquot);
2840
                return ext4_write_dquot(dquot);
2841
        } else {
2842
                return dquot_mark_dquot_dirty(dquot);
2843
        }
2844
}
2845
 
2846
static int ext4_write_info(struct super_block *sb, int type)
2847
{
2848
        int ret, err;
2849
        handle_t *handle;
2850
 
2851
        /* Data block + inode block */
2852
        handle = ext4_journal_start(sb->s_root->d_inode, 2);
2853
        if (IS_ERR(handle))
2854
                return PTR_ERR(handle);
2855
        ret = dquot_commit_info(sb, type);
2856
        err = ext4_journal_stop(handle);
2857
        if (!ret)
2858
                ret = err;
2859
        return ret;
2860
}
2861
 
2862
/*
2863
 * Turn on quotas during mount time - we need to find
2864
 * the quota file and such...
2865
 */
2866
static int ext4_quota_on_mount(struct super_block *sb, int type)
2867
{
2868
        return vfs_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
2869
                        EXT4_SB(sb)->s_jquota_fmt, type);
2870
}
2871
 
2872
/*
2873
 * Standard function to be called on quota_on
2874
 */
2875
static int ext4_quota_on(struct super_block *sb, int type, int format_id,
2876
                         char *path)
2877
{
2878
        int err;
2879
        struct nameidata nd;
2880
 
2881
        if (!test_opt(sb, QUOTA))
2882
                return -EINVAL;
2883
        /* Not journalling quota? */
2884
        if (!EXT4_SB(sb)->s_qf_names[USRQUOTA] &&
2885
            !EXT4_SB(sb)->s_qf_names[GRPQUOTA])
2886
                return vfs_quota_on(sb, type, format_id, path);
2887
        err = path_lookup(path, LOOKUP_FOLLOW, &nd);
2888
        if (err)
2889
                return err;
2890
        /* Quotafile not on the same filesystem? */
2891
        if (nd.mnt->mnt_sb != sb) {
2892
                path_release(&nd);
2893
                return -EXDEV;
2894
        }
2895
        /* Quotafile not of fs root? */
2896
        if (nd.dentry->d_parent->d_inode != sb->s_root->d_inode)
2897
                printk(KERN_WARNING
2898
                        "EXT4-fs: Quota file not on filesystem root. "
2899
                        "Journalled quota will not work.\n");
2900
        path_release(&nd);
2901
        return vfs_quota_on(sb, type, format_id, path);
2902
}
2903
 
2904
/* Read data from quotafile - avoid pagecache and such because we cannot afford
2905
 * acquiring the locks... As quota files are never truncated and quota code
2906
 * itself serializes the operations (and noone else should touch the files)
2907
 * we don't have to be afraid of races */
2908
static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
2909
                               size_t len, loff_t off)
2910
{
2911
        struct inode *inode = sb_dqopt(sb)->files[type];
2912
        sector_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
2913
        int err = 0;
2914
        int offset = off & (sb->s_blocksize - 1);
2915
        int tocopy;
2916
        size_t toread;
2917
        struct buffer_head *bh;
2918
        loff_t i_size = i_size_read(inode);
2919
 
2920
        if (off > i_size)
2921
                return 0;
2922
        if (off+len > i_size)
2923
                len = i_size-off;
2924
        toread = len;
2925
        while (toread > 0) {
2926
                tocopy = sb->s_blocksize - offset < toread ?
2927
                                sb->s_blocksize - offset : toread;
2928
                bh = ext4_bread(NULL, inode, blk, 0, &err);
2929
                if (err)
2930
                        return err;
2931
                if (!bh)        /* A hole? */
2932
                        memset(data, 0, tocopy);
2933
                else
2934
                        memcpy(data, bh->b_data+offset, tocopy);
2935
                brelse(bh);
2936
                offset = 0;
2937
                toread -= tocopy;
2938
                data += tocopy;
2939
                blk++;
2940
        }
2941
        return len;
2942
}
2943
 
2944
/* Write to quotafile (we know the transaction is already started and has
2945
 * enough credits) */
2946
static ssize_t ext4_quota_write(struct super_block *sb, int type,
2947
                                const char *data, size_t len, loff_t off)
2948
{
2949
        struct inode *inode = sb_dqopt(sb)->files[type];
2950
        sector_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
2951
        int err = 0;
2952
        int offset = off & (sb->s_blocksize - 1);
2953
        int tocopy;
2954
        int journal_quota = EXT4_SB(sb)->s_qf_names[type] != NULL;
2955
        size_t towrite = len;
2956
        struct buffer_head *bh;
2957
        handle_t *handle = journal_current_handle();
2958
 
2959
        if (!handle) {
2960
                printk(KERN_WARNING "EXT4-fs: Quota write (off=%Lu, len=%Lu)"
2961
                        " cancelled because transaction is not started.\n",
2962
                        (unsigned long long)off, (unsigned long long)len);
2963
                return -EIO;
2964
        }
2965
        mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
2966
        while (towrite > 0) {
2967
                tocopy = sb->s_blocksize - offset < towrite ?
2968
                                sb->s_blocksize - offset : towrite;
2969
                bh = ext4_bread(handle, inode, blk, 1, &err);
2970
                if (!bh)
2971
                        goto out;
2972
                if (journal_quota) {
2973
                        err = ext4_journal_get_write_access(handle, bh);
2974
                        if (err) {
2975
                                brelse(bh);
2976
                                goto out;
2977
                        }
2978
                }
2979
                lock_buffer(bh);
2980
                memcpy(bh->b_data+offset, data, tocopy);
2981
                flush_dcache_page(bh->b_page);
2982
                unlock_buffer(bh);
2983
                if (journal_quota)
2984
                        err = ext4_journal_dirty_metadata(handle, bh);
2985
                else {
2986
                        /* Always do at least ordered writes for quotas */
2987
                        err = ext4_journal_dirty_data(handle, bh);
2988
                        mark_buffer_dirty(bh);
2989
                }
2990
                brelse(bh);
2991
                if (err)
2992
                        goto out;
2993
                offset = 0;
2994
                towrite -= tocopy;
2995
                data += tocopy;
2996
                blk++;
2997
        }
2998
out:
2999
        if (len == towrite)
3000
                return err;
3001
        if (inode->i_size < off+len-towrite) {
3002
                i_size_write(inode, off+len-towrite);
3003
                EXT4_I(inode)->i_disksize = inode->i_size;
3004
        }
3005
        inode->i_version++;
3006
        inode->i_mtime = inode->i_ctime = CURRENT_TIME;
3007
        ext4_mark_inode_dirty(handle, inode);
3008
        mutex_unlock(&inode->i_mutex);
3009
        return len - towrite;
3010
}
3011
 
3012
#endif
3013
 
3014
static int ext4_get_sb(struct file_system_type *fs_type,
3015
        int flags, const char *dev_name, void *data, struct vfsmount *mnt)
3016
{
3017
        return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super, mnt);
3018
}
3019
 
3020
static struct file_system_type ext4dev_fs_type = {
3021
        .owner          = THIS_MODULE,
3022
        .name           = "ext4dev",
3023
        .get_sb         = ext4_get_sb,
3024
        .kill_sb        = kill_block_super,
3025
        .fs_flags       = FS_REQUIRES_DEV,
3026
};
3027
 
3028
static int __init init_ext4_fs(void)
3029
{
3030
        int err = init_ext4_xattr();
3031
        if (err)
3032
                return err;
3033
        err = init_inodecache();
3034
        if (err)
3035
                goto out1;
3036
        err = register_filesystem(&ext4dev_fs_type);
3037
        if (err)
3038
                goto out;
3039
        return 0;
3040
out:
3041
        destroy_inodecache();
3042
out1:
3043
        exit_ext4_xattr();
3044
        return err;
3045
}
3046
 
3047
static void __exit exit_ext4_fs(void)
3048
{
3049
        unregister_filesystem(&ext4dev_fs_type);
3050
        destroy_inodecache();
3051
        exit_ext4_xattr();
3052
}
3053
 
3054
MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
3055
MODULE_DESCRIPTION("Fourth Extended Filesystem with extents");
3056
MODULE_LICENSE("GPL");
3057
module_init(init_ext4_fs)
3058
module_exit(exit_ext4_fs)

powered by: WebSVN 2.1.0

© copyright 1999-2025 OpenCores.org, equivalent to Oliscience, all rights reserved. OpenCores®, registered trademark.