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ext4: Improve the documentation for ext4's /proc tunables
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / fs / ext4 / super.c
CommitLineData
ac27a0ec 1/*
617ba13b 2 * linux/fs/ext4/super.c
ac27a0ec
DK		 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>
dab291af 23#include <linux/jbd2.h>
ac27a0ec
DK		 24#include <linux/slab.h>
25#include <linux/init.h>
26#include <linux/blkdev.h>
27#include <linux/parser.h>
28#include <linux/smp_lock.h>
29#include <linux/buffer_head.h>
a5694255 30#include <linux/exportfs.h>
ac27a0ec
DK		 31#include <linux/vfs.h>
32#include <linux/random.h>
33#include <linux/mount.h>
34#include <linux/namei.h>
35#include <linux/quotaops.h>
36#include <linux/seq_file.h>
9f6200bb 37#include <linux/proc_fs.h>
1330593e 38#include <linux/log2.h>
717d50e4 39#include <linux/crc16.h>
ac27a0ec
DK		 40#include <asm/uaccess.h>
41
3dcf5451
CH		 42#include "ext4.h"
43#include "ext4_jbd2.h"
ac27a0ec
DK		 44#include "xattr.h"
45#include "acl.h"
46#include "namei.h"
717d50e4 47#include "group.h"
ac27a0ec 48
9f6200bb
TT		 49struct proc_dir_entry *ext4_proc_root;
50
617ba13b 51static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
ac27a0ec 52 unsigned long journal_devnum);
617ba13b 53static int ext4_create_journal(struct super_block *, struct ext4_super_block *,
ac27a0ec 54 unsigned int);
2b2d6d01
TT		 55static void ext4_commit_super(struct super_block *sb,
56 struct ext4_super_block *es, int sync);
57static void ext4_mark_recovery_complete(struct super_block *sb,
58 struct ext4_super_block *es);
59static void ext4_clear_journal_err(struct super_block *sb,
60 struct ext4_super_block *es);
617ba13b 61static int ext4_sync_fs(struct super_block *sb, int wait);
2b2d6d01 62static const char *ext4_decode_error(struct super_block *sb, int errno,
ac27a0ec 63 char nbuf[16]);
2b2d6d01
TT		 64static int ext4_remount(struct super_block *sb, int *flags, char *data);
65static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
617ba13b 66static void ext4_unlockfs(struct super_block *sb);
2b2d6d01 67static void ext4_write_super(struct super_block *sb);
617ba13b 68static void ext4_write_super_lockfs(struct super_block *sb);
ac27a0ec 69
bd81d8ee 70
8fadc143
AR		 71ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
72 struct ext4_group_desc *bg)
bd81d8ee 73{
3a14589c 74 return le32_to_cpu(bg->bg_block_bitmap_lo) |
8fadc143 75 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
3a14589c 76 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 77}
78
8fadc143
AR		 79ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
80 struct ext4_group_desc *bg)
bd81d8ee 81{
5272f837 82 return le32_to_cpu(bg->bg_inode_bitmap_lo) |
8fadc143 83 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
5272f837 84 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 85}
86
8fadc143
AR		 87ext4_fsblk_t ext4_inode_table(struct super_block *sb,
88 struct ext4_group_desc *bg)
bd81d8ee 89{
5272f837 90 return le32_to_cpu(bg->bg_inode_table_lo) |
8fadc143 91 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
5272f837 92 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
bd81d8ee
LV		 93}
94
8fadc143
AR		 95void ext4_block_bitmap_set(struct super_block *sb,
96 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 97{
3a14589c 98 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 99 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
100 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 101}
102
8fadc143
AR		 103void ext4_inode_bitmap_set(struct super_block *sb,
104 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 105{
5272f837 106 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 107 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
108 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 109}
110
8fadc143
AR		 111void ext4_inode_table_set(struct super_block *sb,
112 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 113{
5272f837 114 bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 115 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
116 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 117}
118
ac27a0ec 119/*
dab291af 120 * Wrappers for jbd2_journal_start/end.
ac27a0ec
DK		 121 *
122 * The only special thing we need to do here is to make sure that all
123 * journal_end calls result in the superblock being marked dirty, so
124 * that sync() will call the filesystem's write_super callback if
125 * appropriate.
126 */
617ba13b 127handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks)
ac27a0ec
DK		 128{
129 journal_t *journal;
130
131 if (sb->s_flags & MS_RDONLY)
132 return ERR_PTR(-EROFS);
133
134 /* Special case here: if the journal has aborted behind our
135 * backs (eg. EIO in the commit thread), then we still need to
136 * take the FS itself readonly cleanly. */
617ba13b 137 journal = EXT4_SB(sb)->s_journal;
ac27a0ec 138 if (is_journal_aborted(journal)) {
46e665e9 139 ext4_abort(sb, __func__,
ac27a0ec
DK		 140 "Detected aborted journal");
141 return ERR_PTR(-EROFS);
142 }
143
dab291af 144 return jbd2_journal_start(journal, nblocks);
ac27a0ec
DK		 145}
146
147/*
148 * The only special thing we need to do here is to make sure that all
dab291af 149 * jbd2_journal_stop calls result in the superblock being marked dirty, so
ac27a0ec
DK		 150 * that sync() will call the filesystem's write_super callback if
151 * appropriate.
152 */
617ba13b 153int __ext4_journal_stop(const char *where, handle_t *handle)
ac27a0ec
DK		 154{
155 struct super_block *sb;
156 int err;
157 int rc;
158
159 sb = handle->h_transaction->t_journal->j_private;
160 err = handle->h_err;
dab291af 161 rc = jbd2_journal_stop(handle);
ac27a0ec
DK		 162
163 if (!err)
164 err = rc;
165 if (err)
617ba13b 166 __ext4_std_error(sb, where, err);
ac27a0ec
DK		 167 return err;
168}
169
617ba13b 170void ext4_journal_abort_handle(const char *caller, const char *err_fn,
ac27a0ec
DK		 171 struct buffer_head *bh, handle_t *handle, int err)
172{
173 char nbuf[16];
617ba13b 174 const char *errstr = ext4_decode_error(NULL, err, nbuf);
ac27a0ec
DK		 175
176 if (bh)
177 BUFFER_TRACE(bh, "abort");
178
179 if (!handle->h_err)
180 handle->h_err = err;
181
182 if (is_handle_aborted(handle))
183 return;
184
185 printk(KERN_ERR "%s: aborting transaction: %s in %s\n",
186 caller, errstr, err_fn);
187
dab291af 188 jbd2_journal_abort_handle(handle);
ac27a0ec
DK		 189}
190
191/* Deal with the reporting of failure conditions on a filesystem such as
192 * inconsistencies detected or read IO failures.
193 *
194 * On ext2, we can store the error state of the filesystem in the
617ba13b 195 * superblock. That is not possible on ext4, because we may have other
ac27a0ec
DK		 196 * write ordering constraints on the superblock which prevent us from
197 * writing it out straight away; and given that the journal is about to
198 * be aborted, we can't rely on the current, or future, transactions to
199 * write out the superblock safely.
200 *
dab291af 201 * We'll just use the jbd2_journal_abort() error code to record an error in
ac27a0ec
DK		 202 * the journal instead. On recovery, the journal will compain about
203 * that error until we've noted it down and cleared it.
204 */
205
617ba13b 206static void ext4_handle_error(struct super_block *sb)
ac27a0ec 207{
617ba13b 208 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
ac27a0ec 209
617ba13b
MC		 210 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
211 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
ac27a0ec
DK		 212
213 if (sb->s_flags & MS_RDONLY)
214 return;
215
2b2d6d01 216 if (!test_opt(sb, ERRORS_CONT)) {
617ba13b 217 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 218
617ba13b 219 EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT;
ac27a0ec 220 if (journal)
dab291af 221 jbd2_journal_abort(journal, -EIO);
ac27a0ec 222 }
2b2d6d01
TT		 223 if (test_opt(sb, ERRORS_RO)) {
224 printk(KERN_CRIT "Remounting filesystem read-only\n");
ac27a0ec
DK		 225 sb->s_flags |= MS_RDONLY;
226 }
617ba13b 227 ext4_commit_super(sb, es, 1);
ac27a0ec 228 if (test_opt(sb, ERRORS_PANIC))
617ba13b 229 panic("EXT4-fs (device %s): panic forced after error\n",
ac27a0ec
DK		 230 sb->s_id);
231}
232
2b2d6d01
TT		 233void ext4_error(struct super_block *sb, const char *function,
234 const char *fmt, ...)
ac27a0ec
DK		 235{
236 va_list args;
237
238 va_start(args, fmt);
2b2d6d01 239 printk(KERN_CRIT "EXT4-fs error (device %s): %s: ", sb->s_id, function);
ac27a0ec
DK		 240 vprintk(fmt, args);
241 printk("\n");
242 va_end(args);
243
617ba13b 244 ext4_handle_error(sb);
ac27a0ec
DK		 245}
246
2b2d6d01 247static const char *ext4_decode_error(struct super_block *sb, int errno,
ac27a0ec
DK		 248 char nbuf[16])
249{
250 char *errstr = NULL;
251
252 switch (errno) {
253 case -EIO:
254 errstr = "IO failure";
255 break;
256 case -ENOMEM:
257 errstr = "Out of memory";
258 break;
259 case -EROFS:
dab291af 260 if (!sb || EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT)
ac27a0ec
DK		 261 errstr = "Journal has aborted";
262 else
263 errstr = "Readonly filesystem";
264 break;
265 default:
266 /* If the caller passed in an extra buffer for unknown
267 * errors, textualise them now. Else we just return
268 * NULL. */
269 if (nbuf) {
270 /* Check for truncated error codes... */
271 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
272 errstr = nbuf;
273 }
274 break;
275 }
276
277 return errstr;
278}
279
617ba13b 280/* __ext4_std_error decodes expected errors from journaling functions
ac27a0ec
DK		 281 * automatically and invokes the appropriate error response. */
282
2b2d6d01 283void __ext4_std_error(struct super_block *sb, const char *function, int errno)
ac27a0ec
DK		 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
617ba13b 295 errstr = ext4_decode_error(sb, errno, nbuf);
2b2d6d01
TT		 296 printk(KERN_CRIT "EXT4-fs error (device %s) in %s: %s\n",
297 sb->s_id, function, errstr);
ac27a0ec 298
617ba13b 299 ext4_handle_error(sb);
ac27a0ec
DK		 300}
301
302/*
617ba13b 303 * ext4_abort is a much stronger failure handler than ext4_error. The
ac27a0ec
DK		 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
2b2d6d01
TT		 312void ext4_abort(struct super_block *sb, const char *function,
313 const char *fmt, ...)
ac27a0ec
DK		 314{
315 va_list args;
316
2b2d6d01 317 printk(KERN_CRIT "ext4_abort called.\n");
ac27a0ec
DK		 318
319 va_start(args, fmt);
2b2d6d01 320 printk(KERN_CRIT "EXT4-fs error (device %s): %s: ", sb->s_id, function);
ac27a0ec
DK		 321 vprintk(fmt, args);
322 printk("\n");
323 va_end(args);
324
325 if (test_opt(sb, ERRORS_PANIC))
617ba13b 326 panic("EXT4-fs panic from previous error\n");
ac27a0ec
DK		 327
328 if (sb->s_flags & MS_RDONLY)
329 return;
330
331 printk(KERN_CRIT "Remounting filesystem read-only\n");
617ba13b 332 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
ac27a0ec 333 sb->s_flags |= MS_RDONLY;
617ba13b 334 EXT4_SB(sb)->s_mount_opt |= EXT4_MOUNT_ABORT;
dab291af 335 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
ac27a0ec
DK		 336}
337
2b2d6d01
TT		 338void ext4_warning(struct super_block *sb, const char *function,
339 const char *fmt, ...)
ac27a0ec
DK		 340{
341 va_list args;
342
343 va_start(args, fmt);
617ba13b 344 printk(KERN_WARNING "EXT4-fs warning (device %s): %s: ",
ac27a0ec
DK		 345 sb->s_id, function);
346 vprintk(fmt, args);
347 printk("\n");
348 va_end(args);
349}
350
617ba13b 351void ext4_update_dynamic_rev(struct super_block *sb)
ac27a0ec 352{
617ba13b 353 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
ac27a0ec 354
617ba13b 355 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
ac27a0ec
DK		 356 return;
357
46e665e9 358 ext4_warning(sb, __func__,
ac27a0ec
DK		 359 "updating to rev %d because of new feature flag, "
360 "running e2fsck is recommended",
617ba13b 361 EXT4_DYNAMIC_REV);
ac27a0ec 362
617ba13b
MC		 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);
ac27a0ec
DK		 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
99e6f829
AK		 376int ext4_update_compat_feature(handle_t *handle,
377 struct super_block *sb, __u32 compat)
378{
379 int err = 0;
380 if (!EXT4_HAS_COMPAT_FEATURE(sb, compat)) {
381 err = ext4_journal_get_write_access(handle,
382 EXT4_SB(sb)->s_sbh);
383 if (err)
384 return err;
385 EXT4_SET_COMPAT_FEATURE(sb, compat);
386 sb->s_dirt = 1;
387 handle->h_sync = 1;
388 BUFFER_TRACE(EXT4_SB(sb)->s_sbh,
389 "call ext4_journal_dirty_met adata");
390 err = ext4_journal_dirty_metadata(handle,
391 EXT4_SB(sb)->s_sbh);
392 }
393 return err;
394}
395
396int ext4_update_rocompat_feature(handle_t *handle,
397 struct super_block *sb, __u32 rocompat)
398{
399 int err = 0;
400 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, rocompat)) {
401 err = ext4_journal_get_write_access(handle,
402 EXT4_SB(sb)->s_sbh);
403 if (err)
404 return err;
405 EXT4_SET_RO_COMPAT_FEATURE(sb, rocompat);
406 sb->s_dirt = 1;
407 handle->h_sync = 1;
408 BUFFER_TRACE(EXT4_SB(sb)->s_sbh,
409 "call ext4_journal_dirty_met adata");
410 err = ext4_journal_dirty_metadata(handle,
411 EXT4_SB(sb)->s_sbh);
412 }
413 return err;
414}
415
416int ext4_update_incompat_feature(handle_t *handle,
417 struct super_block *sb, __u32 incompat)
418{
419 int err = 0;
420 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, incompat)) {
421 err = ext4_journal_get_write_access(handle,
422 EXT4_SB(sb)->s_sbh);
423 if (err)
424 return err;
425 EXT4_SET_INCOMPAT_FEATURE(sb, incompat);
426 sb->s_dirt = 1;
427 handle->h_sync = 1;
428 BUFFER_TRACE(EXT4_SB(sb)->s_sbh,
429 "call ext4_journal_dirty_met adata");
430 err = ext4_journal_dirty_metadata(handle,
431 EXT4_SB(sb)->s_sbh);
432 }
433 return err;
434}
435
ac27a0ec
DK		 436/*
437 * Open the external journal device
438 */
617ba13b 439static struct block_device *ext4_blkdev_get(dev_t dev)
ac27a0ec
DK		 440{
441 struct block_device *bdev;
442 char b[BDEVNAME_SIZE];
443
444 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
445 if (IS_ERR(bdev))
446 goto fail;
447 return bdev;
448
449fail:
617ba13b 450 printk(KERN_ERR "EXT4: failed to open journal device %s: %ld\n",
ac27a0ec
DK		 451 __bdevname(dev, b), PTR_ERR(bdev));
452 return NULL;
453}
454
455/*
456 * Release the journal device
457 */
617ba13b 458static int ext4_blkdev_put(struct block_device *bdev)
ac27a0ec
DK		 459{
460 bd_release(bdev);
461 return blkdev_put(bdev);
462}
463
617ba13b 464static int ext4_blkdev_remove(struct ext4_sb_info *sbi)
ac27a0ec
DK		 465{
466 struct block_device *bdev;
467 int ret = -ENODEV;
468
469 bdev = sbi->journal_bdev;
470 if (bdev) {
617ba13b 471 ret = ext4_blkdev_put(bdev);
ac27a0ec
DK		 472 sbi->journal_bdev = NULL;
473 }
474 return ret;
475}
476
477static inline struct inode *orphan_list_entry(struct list_head *l)
478{
617ba13b 479 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
ac27a0ec
DK		 480}
481
617ba13b 482static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
ac27a0ec
DK		 483{
484 struct list_head *l;
485
486 printk(KERN_ERR "sb orphan head is %d\n",
487 le32_to_cpu(sbi->s_es->s_last_orphan));
488
489 printk(KERN_ERR "sb_info orphan list:\n");
490 list_for_each(l, &sbi->s_orphan) {
491 struct inode *inode = orphan_list_entry(l);
492 printk(KERN_ERR " "
493 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
494 inode->i_sb->s_id, inode->i_ino, inode,
495 inode->i_mode, inode->i_nlink,
496 NEXT_ORPHAN(inode));
497 }
498}
499
2b2d6d01 500static void ext4_put_super(struct super_block *sb)
ac27a0ec 501{
617ba13b
MC		 502 struct ext4_sb_info *sbi = EXT4_SB(sb);
503 struct ext4_super_block *es = sbi->s_es;
ac27a0ec
DK		 504 int i;
505
c9de560d 506 ext4_mb_release(sb);
a86c6181 507 ext4_ext_release(sb);
617ba13b 508 ext4_xattr_put_super(sb);
dab291af 509 jbd2_journal_destroy(sbi->s_journal);
47b4a50b 510 sbi->s_journal = NULL;
ac27a0ec 511 if (!(sb->s_flags & MS_RDONLY)) {
617ba13b 512 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
ac27a0ec
DK		 513 es->s_state = cpu_to_le16(sbi->s_mount_state);
514 BUFFER_TRACE(sbi->s_sbh, "marking dirty");
515 mark_buffer_dirty(sbi->s_sbh);
617ba13b 516 ext4_commit_super(sb, es, 1);
ac27a0ec 517 }
9f6200bb
TT		 518 if (sbi->s_proc)
519 remove_proc_entry(sb->s_id, ext4_proc_root);
ac27a0ec
DK		 520
521 for (i = 0; i < sbi->s_gdb_count; i++)
522 brelse(sbi->s_group_desc[i]);
523 kfree(sbi->s_group_desc);
772cb7c8 524 kfree(sbi->s_flex_groups);
ac27a0ec
DK		 525 percpu_counter_destroy(&sbi->s_freeblocks_counter);
526 percpu_counter_destroy(&sbi->s_freeinodes_counter);
527 percpu_counter_destroy(&sbi->s_dirs_counter);
6bc6e63f 528 percpu_counter_destroy(&sbi->s_dirtyblocks_counter);
ac27a0ec
DK		 529 brelse(sbi->s_sbh);
530#ifdef CONFIG_QUOTA
531 for (i = 0; i < MAXQUOTAS; i++)
532 kfree(sbi->s_qf_names[i]);
533#endif
534
535 /* Debugging code just in case the in-memory inode orphan list
536 * isn't empty. The on-disk one can be non-empty if we've
537 * detected an error and taken the fs readonly, but the
538 * in-memory list had better be clean by this point. */
539 if (!list_empty(&sbi->s_orphan))
540 dump_orphan_list(sb, sbi);
541 J_ASSERT(list_empty(&sbi->s_orphan));
542
f98393a6 543 invalidate_bdev(sb->s_bdev);
ac27a0ec
DK		 544 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
545 /*
546 * Invalidate the journal device's buffers. We don't want them
547 * floating about in memory - the physical journal device may
548 * hotswapped, and it breaks the `ro-after' testing code.
549 */
550 sync_blockdev(sbi->journal_bdev);
f98393a6 551 invalidate_bdev(sbi->journal_bdev);
617ba13b 552 ext4_blkdev_remove(sbi);
ac27a0ec
DK		 553 }
554 sb->s_fs_info = NULL;
555 kfree(sbi);
556 return;
557}
558
e18b890b 559static struct kmem_cache *ext4_inode_cachep;
ac27a0ec
DK		 560
561/*
562 * Called inside transaction, so use GFP_NOFS
563 */
617ba13b 564static struct inode *ext4_alloc_inode(struct super_block *sb)
ac27a0ec 565{
617ba13b 566 struct ext4_inode_info *ei;
ac27a0ec 567
e6b4f8da 568 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
ac27a0ec
DK		 569 if (!ei)
570 return NULL;
617ba13b
MC		 571#ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
572 ei->i_acl = EXT4_ACL_NOT_CACHED;
573 ei->i_default_acl = EXT4_ACL_NOT_CACHED;
ac27a0ec
DK		 574#endif
575 ei->i_block_alloc_info = NULL;
576 ei->vfs_inode.i_version = 1;
91246c00 577 ei->vfs_inode.i_data.writeback_index = 0;
a86c6181 578 memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache));
c9de560d
AT		 579 INIT_LIST_HEAD(&ei->i_prealloc_list);
580 spin_lock_init(&ei->i_prealloc_lock);
678aaf48 581 jbd2_journal_init_jbd_inode(&ei->jinode, &ei->vfs_inode);
d2a17637
MC		 582 ei->i_reserved_data_blocks = 0;
583 ei->i_reserved_meta_blocks = 0;
584 ei->i_allocated_meta_blocks = 0;
585 ei->i_delalloc_reserved_flag = 0;
586 spin_lock_init(&(ei->i_block_reservation_lock));
ac27a0ec
DK		 587 return &ei->vfs_inode;
588}
589
617ba13b 590static void ext4_destroy_inode(struct inode *inode)
ac27a0ec 591{
9f7dd93d
VA		 592 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
593 printk("EXT4 Inode %p: orphan list check failed!\n",
594 EXT4_I(inode));
595 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
596 EXT4_I(inode), sizeof(struct ext4_inode_info),
597 true);
598 dump_stack();
599 }
617ba13b 600 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
ac27a0ec
DK		 601}
602
51cc5068 603static void init_once(void *foo)
ac27a0ec 604{
617ba13b 605 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
ac27a0ec 606
a35afb83 607 INIT_LIST_HEAD(&ei->i_orphan);
617ba13b 608#ifdef CONFIG_EXT4DEV_FS_XATTR
a35afb83 609 init_rwsem(&ei->xattr_sem);
ac27a0ec 610#endif
0e855ac8 611 init_rwsem(&ei->i_data_sem);
a35afb83 612 inode_init_once(&ei->vfs_inode);
ac27a0ec
DK		 613}
614
615static int init_inodecache(void)
616{
617ba13b
MC		 617 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
618 sizeof(struct ext4_inode_info),
ac27a0ec
DK		 619 0, (SLAB_RECLAIM_ACCOUNT|
620 SLAB_MEM_SPREAD),
20c2df83 621 init_once);
617ba13b 622 if (ext4_inode_cachep == NULL)
ac27a0ec
DK		 623 return -ENOMEM;
624 return 0;
625}
626
627static void destroy_inodecache(void)
628{
617ba13b 629 kmem_cache_destroy(ext4_inode_cachep);
ac27a0ec
DK		 630}
631
617ba13b 632static void ext4_clear_inode(struct inode *inode)
ac27a0ec 633{
617ba13b
MC		 634 struct ext4_block_alloc_info *rsv = EXT4_I(inode)->i_block_alloc_info;
635#ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
636 if (EXT4_I(inode)->i_acl &&
637 EXT4_I(inode)->i_acl != EXT4_ACL_NOT_CACHED) {
638 posix_acl_release(EXT4_I(inode)->i_acl);
639 EXT4_I(inode)->i_acl = EXT4_ACL_NOT_CACHED;
640 }
641 if (EXT4_I(inode)->i_default_acl &&
642 EXT4_I(inode)->i_default_acl != EXT4_ACL_NOT_CACHED) {
643 posix_acl_release(EXT4_I(inode)->i_default_acl);
644 EXT4_I(inode)->i_default_acl = EXT4_ACL_NOT_CACHED;
ac27a0ec
DK		 645 }
646#endif
617ba13b
MC		 647 ext4_discard_reservation(inode);
648 EXT4_I(inode)->i_block_alloc_info = NULL;
ac27a0ec
DK		 649 if (unlikely(rsv))
650 kfree(rsv);
678aaf48
JK		 651 jbd2_journal_release_jbd_inode(EXT4_SB(inode->i_sb)->s_journal,
652 &EXT4_I(inode)->jinode);
ac27a0ec
DK		 653}
654
2b2d6d01
TT		 655static inline void ext4_show_quota_options(struct seq_file *seq,
656 struct super_block *sb)
ac27a0ec
DK		 657{
658#if defined(CONFIG_QUOTA)
617ba13b 659 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec
DK		 660
661 if (sbi->s_jquota_fmt)
662 seq_printf(seq, ",jqfmt=%s",
af5bc92d 663 (sbi->s_jquota_fmt == QFMT_VFS_OLD) ? "vfsold" : "vfsv0");
ac27a0ec
DK		 664
665 if (sbi->s_qf_names[USRQUOTA])
666 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
667
668 if (sbi->s_qf_names[GRPQUOTA])
669 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
670
617ba13b 671 if (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA)
ac27a0ec
DK		 672 seq_puts(seq, ",usrquota");
673
617ba13b 674 if (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)
ac27a0ec
DK		 675 seq_puts(seq, ",grpquota");
676#endif
677}
678
d9c9bef1
MS		 679/*
680 * Show an option if
681 * - it's set to a non-default value OR
682 * - if the per-sb default is different from the global default
683 */
617ba13b 684static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs)
ac27a0ec 685{
aa22df2c
AK		 686 int def_errors;
687 unsigned long def_mount_opts;
ac27a0ec 688 struct super_block *sb = vfs->mnt_sb;
d9c9bef1
MS		 689 struct ext4_sb_info *sbi = EXT4_SB(sb);
690 struct ext4_super_block *es = sbi->s_es;
d9c9bef1
MS		 691
692 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
aa22df2c 693 def_errors = le16_to_cpu(es->s_errors);
d9c9bef1
MS		 694
695 if (sbi->s_sb_block != 1)
696 seq_printf(seq, ",sb=%llu", sbi->s_sb_block);
697 if (test_opt(sb, MINIX_DF))
698 seq_puts(seq, ",minixdf");
aa22df2c 699 if (test_opt(sb, GRPID) && !(def_mount_opts & EXT4_DEFM_BSDGROUPS))
d9c9bef1
MS		 700 seq_puts(seq, ",grpid");
701 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT4_DEFM_BSDGROUPS))
702 seq_puts(seq, ",nogrpid");
703 if (sbi->s_resuid != EXT4_DEF_RESUID ||
704 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID) {
705 seq_printf(seq, ",resuid=%u", sbi->s_resuid);
706 }
707 if (sbi->s_resgid != EXT4_DEF_RESGID ||
708 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID) {
709 seq_printf(seq, ",resgid=%u", sbi->s_resgid);
710 }
bb4f397a 711 if (test_opt(sb, ERRORS_RO)) {
d9c9bef1 712 if (def_errors == EXT4_ERRORS_PANIC ||
bb4f397a
AK		 713 def_errors == EXT4_ERRORS_CONTINUE) {
714 seq_puts(seq, ",errors=remount-ro");
d9c9bef1
MS		 715 }
716 }
aa22df2c 717 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
bb4f397a 718 seq_puts(seq, ",errors=continue");
aa22df2c 719 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
d9c9bef1 720 seq_puts(seq, ",errors=panic");
aa22df2c 721 if (test_opt(sb, NO_UID32) && !(def_mount_opts & EXT4_DEFM_UID16))
d9c9bef1 722 seq_puts(seq, ",nouid32");
aa22df2c 723 if (test_opt(sb, DEBUG) && !(def_mount_opts & EXT4_DEFM_DEBUG))
d9c9bef1
MS		 724 seq_puts(seq, ",debug");
725 if (test_opt(sb, OLDALLOC))
726 seq_puts(seq, ",oldalloc");
07620f69 727#ifdef CONFIG_EXT4DEV_FS_XATTR
aa22df2c
AK		 728 if (test_opt(sb, XATTR_USER) &&
729 !(def_mount_opts & EXT4_DEFM_XATTR_USER))
d9c9bef1
MS		 730 seq_puts(seq, ",user_xattr");
731 if (!test_opt(sb, XATTR_USER) &&
732 (def_mount_opts & EXT4_DEFM_XATTR_USER)) {
733 seq_puts(seq, ",nouser_xattr");
734 }
735#endif
07620f69 736#ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
aa22df2c 737 if (test_opt(sb, POSIX_ACL) && !(def_mount_opts & EXT4_DEFM_ACL))
d9c9bef1
MS		 738 seq_puts(seq, ",acl");
739 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT4_DEFM_ACL))
740 seq_puts(seq, ",noacl");
741#endif
742 if (!test_opt(sb, RESERVATION))
743 seq_puts(seq, ",noreservation");
744 if (sbi->s_commit_interval) {
745 seq_printf(seq, ",commit=%u",
746 (unsigned) (sbi->s_commit_interval / HZ));
747 }
571640ca
ES		 748 /*
749 * We're changing the default of barrier mount option, so
750 * let's always display its mount state so it's clear what its
751 * status is.
752 */
753 seq_puts(seq, ",barrier=");
754 seq_puts(seq, test_opt(sb, BARRIER) ? "1" : "0");
cd0b6a39
TT		 755 if (test_opt(sb, JOURNAL_ASYNC_COMMIT))
756 seq_puts(seq, ",journal_async_commit");
d9c9bef1
MS		 757 if (test_opt(sb, NOBH))
758 seq_puts(seq, ",nobh");
759 if (!test_opt(sb, EXTENTS))
760 seq_puts(seq, ",noextents");
3dbd0ede
AK		 761 if (!test_opt(sb, MBALLOC))
762 seq_puts(seq, ",nomballoc");
25ec56b5
JNC		 763 if (test_opt(sb, I_VERSION))
764 seq_puts(seq, ",i_version");
dd919b98
AK		 765 if (!test_opt(sb, DELALLOC))
766 seq_puts(seq, ",nodelalloc");
767
ac27a0ec 768
cb45bbe4
MS		 769 if (sbi->s_stripe)
770 seq_printf(seq, ",stripe=%lu", sbi->s_stripe);
aa22df2c
AK		 771 /*
772 * journal mode get enabled in different ways
773 * So just print the value even if we didn't specify it
774 */
617ba13b 775 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
ac27a0ec 776 seq_puts(seq, ",data=journal");
617ba13b 777 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
ac27a0ec 778 seq_puts(seq, ",data=ordered");
617ba13b 779 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
ac27a0ec
DK		 780 seq_puts(seq, ",data=writeback");
781
617ba13b 782 ext4_show_quota_options(seq, sb);
ac27a0ec
DK		 783 return 0;
784}
785
786
1b961ac0
CH		 787static struct inode *ext4_nfs_get_inode(struct super_block *sb,
788 u64 ino, u32 generation)
ac27a0ec 789{
ac27a0ec 790 struct inode *inode;
ac27a0ec 791
617ba13b 792 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
ac27a0ec 793 return ERR_PTR(-ESTALE);
617ba13b 794 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
ac27a0ec
DK		 795 return ERR_PTR(-ESTALE);
796
797 /* iget isn't really right if the inode is currently unallocated!!
798 *
617ba13b 799 * ext4_read_inode will return a bad_inode if the inode had been
ac27a0ec
DK		 800 * deleted, so we should be safe.
801 *
802 * Currently we don't know the generation for parent directory, so
803 * a generation of 0 means "accept any"
804 */
1d1fe1ee
DH		 805 inode = ext4_iget(sb, ino);
806 if (IS_ERR(inode))
807 return ERR_CAST(inode);
808 if (generation && inode->i_generation != generation) {
ac27a0ec
DK		 809 iput(inode);
810 return ERR_PTR(-ESTALE);
811 }
1b961ac0
CH		 812
813 return inode;
814}
815
816static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
817 int fh_len, int fh_type)
818{
819 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
820 ext4_nfs_get_inode);
821}
822
823static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
824 int fh_len, int fh_type)
825{
826 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
827 ext4_nfs_get_inode);
ac27a0ec
DK		 828}
829
830#ifdef CONFIG_QUOTA
af5bc92d 831#define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
2b2d6d01 832#define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
ac27a0ec 833
617ba13b
MC		 834static int ext4_dquot_initialize(struct inode *inode, int type);
835static int ext4_dquot_drop(struct inode *inode);
836static int ext4_write_dquot(struct dquot *dquot);
837static int ext4_acquire_dquot(struct dquot *dquot);
838static int ext4_release_dquot(struct dquot *dquot);
839static int ext4_mark_dquot_dirty(struct dquot *dquot);
840static int ext4_write_info(struct super_block *sb, int type);
6f28e087
JK		 841static int ext4_quota_on(struct super_block *sb, int type, int format_id,
842 char *path, int remount);
617ba13b
MC		 843static int ext4_quota_on_mount(struct super_block *sb, int type);
844static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec 845 size_t len, loff_t off);
617ba13b 846static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec
DK		 847 const char *data, size_t len, loff_t off);
848
617ba13b
MC		 849static struct dquot_operations ext4_quota_operations = {
850 .initialize = ext4_dquot_initialize,
851 .drop = ext4_dquot_drop,
ac27a0ec
DK		 852 .alloc_space = dquot_alloc_space,
853 .alloc_inode = dquot_alloc_inode,
854 .free_space = dquot_free_space,
855 .free_inode = dquot_free_inode,
856 .transfer = dquot_transfer,
617ba13b
MC		 857 .write_dquot = ext4_write_dquot,
858 .acquire_dquot = ext4_acquire_dquot,
859 .release_dquot = ext4_release_dquot,
860 .mark_dirty = ext4_mark_dquot_dirty,
861 .write_info = ext4_write_info
ac27a0ec
DK		 862};
863
617ba13b
MC		 864static struct quotactl_ops ext4_qctl_operations = {
865 .quota_on = ext4_quota_on,
ac27a0ec
DK		 866 .quota_off = vfs_quota_off,
867 .quota_sync = vfs_quota_sync,
868 .get_info = vfs_get_dqinfo,
869 .set_info = vfs_set_dqinfo,
870 .get_dqblk = vfs_get_dqblk,
871 .set_dqblk = vfs_set_dqblk
872};
873#endif
874
ee9b6d61 875static const struct super_operations ext4_sops = {
617ba13b
MC		 876 .alloc_inode = ext4_alloc_inode,
877 .destroy_inode = ext4_destroy_inode,
617ba13b
MC		 878 .write_inode = ext4_write_inode,
879 .dirty_inode = ext4_dirty_inode,
880 .delete_inode = ext4_delete_inode,
881 .put_super = ext4_put_super,
882 .write_super = ext4_write_super,
883 .sync_fs = ext4_sync_fs,
884 .write_super_lockfs = ext4_write_super_lockfs,
885 .unlockfs = ext4_unlockfs,
886 .statfs = ext4_statfs,
887 .remount_fs = ext4_remount,
888 .clear_inode = ext4_clear_inode,
889 .show_options = ext4_show_options,
ac27a0ec 890#ifdef CONFIG_QUOTA
617ba13b
MC		 891 .quota_read = ext4_quota_read,
892 .quota_write = ext4_quota_write,
ac27a0ec
DK		 893#endif
894};
895
39655164 896static const struct export_operations ext4_export_ops = {
1b961ac0
CH		 897 .fh_to_dentry = ext4_fh_to_dentry,
898 .fh_to_parent = ext4_fh_to_parent,
617ba13b 899 .get_parent = ext4_get_parent,
ac27a0ec
DK		 900};
901
902enum {
903 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
904 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
905 Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,
906 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
907 Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh,
908 Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
818d276c 909 Opt_journal_checksum, Opt_journal_async_commit,
ac27a0ec
DK		 910 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
911 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
912 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota,
913 Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota,
25ec56b5 914 Opt_grpquota, Opt_extents, Opt_noextents, Opt_i_version,
dd919b98 915 Opt_mballoc, Opt_nomballoc, Opt_stripe, Opt_delalloc, Opt_nodelalloc,
ac27a0ec
DK		 916};
917
918static match_table_t tokens = {
919 {Opt_bsd_df, "bsddf"},
920 {Opt_minix_df, "minixdf"},
921 {Opt_grpid, "grpid"},
922 {Opt_grpid, "bsdgroups"},
923 {Opt_nogrpid, "nogrpid"},
924 {Opt_nogrpid, "sysvgroups"},
925 {Opt_resgid, "resgid=%u"},
926 {Opt_resuid, "resuid=%u"},
927 {Opt_sb, "sb=%u"},
928 {Opt_err_cont, "errors=continue"},
929 {Opt_err_panic, "errors=panic"},
930 {Opt_err_ro, "errors=remount-ro"},
931 {Opt_nouid32, "nouid32"},
932 {Opt_nocheck, "nocheck"},
933 {Opt_nocheck, "check=none"},
934 {Opt_debug, "debug"},
935 {Opt_oldalloc, "oldalloc"},
936 {Opt_orlov, "orlov"},
937 {Opt_user_xattr, "user_xattr"},
938 {Opt_nouser_xattr, "nouser_xattr"},
939 {Opt_acl, "acl"},
940 {Opt_noacl, "noacl"},
941 {Opt_reservation, "reservation"},
942 {Opt_noreservation, "noreservation"},
943 {Opt_noload, "noload"},
944 {Opt_nobh, "nobh"},
945 {Opt_bh, "bh"},
946 {Opt_commit, "commit=%u"},
947 {Opt_journal_update, "journal=update"},
948 {Opt_journal_inum, "journal=%u"},
949 {Opt_journal_dev, "journal_dev=%u"},
818d276c
GS		 950 {Opt_journal_checksum, "journal_checksum"},
951 {Opt_journal_async_commit, "journal_async_commit"},
ac27a0ec
DK		 952 {Opt_abort, "abort"},
953 {Opt_data_journal, "data=journal"},
954 {Opt_data_ordered, "data=ordered"},
955 {Opt_data_writeback, "data=writeback"},
956 {Opt_offusrjquota, "usrjquota="},
957 {Opt_usrjquota, "usrjquota=%s"},
958 {Opt_offgrpjquota, "grpjquota="},
959 {Opt_grpjquota, "grpjquota=%s"},
960 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
961 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
962 {Opt_grpquota, "grpquota"},
963 {Opt_noquota, "noquota"},
964 {Opt_quota, "quota"},
965 {Opt_usrquota, "usrquota"},
966 {Opt_barrier, "barrier=%u"},
a86c6181 967 {Opt_extents, "extents"},
1e2462f9 968 {Opt_noextents, "noextents"},
25ec56b5 969 {Opt_i_version, "i_version"},
c9de560d
AT		 970 {Opt_mballoc, "mballoc"},
971 {Opt_nomballoc, "nomballoc"},
972 {Opt_stripe, "stripe=%u"},
ac27a0ec 973 {Opt_resize, "resize"},
64769240 974 {Opt_delalloc, "delalloc"},
dd919b98 975 {Opt_nodelalloc, "nodelalloc"},
f3f12faa 976 {Opt_err, NULL},
ac27a0ec
DK		 977};
978
617ba13b 979static ext4_fsblk_t get_sb_block(void **data)
ac27a0ec 980{
617ba13b 981 ext4_fsblk_t sb_block;
ac27a0ec
DK		 982 char *options = (char *) *data;
983
984 if (!options || strncmp(options, "sb=", 3) != 0)
985 return 1; /* Default location */
986 options += 3;
617ba13b 987 /*todo: use simple_strtoll with >32bit ext4 */
ac27a0ec
DK		 988 sb_block = simple_strtoul(options, &options, 0);
989 if (*options && *options != ',') {
4776004f 990 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
ac27a0ec
DK		 991 (char *) *data);
992 return 1;
993 }
994 if (*options == ',')
995 options++;
996 *data = (void *) options;
997 return sb_block;
998}
999
2b2d6d01
TT		 1000static int parse_options(char *options, struct super_block *sb,
1001 unsigned int *inum, unsigned long *journal_devnum,
1002 ext4_fsblk_t *n_blocks_count, int is_remount)
ac27a0ec 1003{
617ba13b 1004 struct ext4_sb_info *sbi = EXT4_SB(sb);
2b2d6d01 1005 char *p;
ac27a0ec
DK		 1006 substring_t args[MAX_OPT_ARGS];
1007 int data_opt = 0;
1008 int option;
1009#ifdef CONFIG_QUOTA
dfc5d03f 1010 int qtype, qfmt;
ac27a0ec
DK		 1011 char *qname;
1012#endif
c07651b5 1013 ext4_fsblk_t last_block;
ac27a0ec
DK		 1014
1015 if (!options)
1016 return 1;
1017
2b2d6d01 1018 while ((p = strsep(&options, ",")) != NULL) {
ac27a0ec
DK		 1019 int token;
1020 if (!*p)
1021 continue;
1022
1023 token = match_token(p, tokens, args);
1024 switch (token) {
1025 case Opt_bsd_df:
2b2d6d01 1026 clear_opt(sbi->s_mount_opt, MINIX_DF);
ac27a0ec
DK		 1027 break;
1028 case Opt_minix_df:
2b2d6d01 1029 set_opt(sbi->s_mount_opt, MINIX_DF);
ac27a0ec
DK		 1030 break;
1031 case Opt_grpid:
2b2d6d01 1032 set_opt(sbi->s_mount_opt, GRPID);
ac27a0ec
DK		 1033 break;
1034 case Opt_nogrpid:
2b2d6d01 1035 clear_opt(sbi->s_mount_opt, GRPID);
ac27a0ec
DK		 1036 break;
1037 case Opt_resuid:
1038 if (match_int(&args[0], &option))
1039 return 0;
1040 sbi->s_resuid = option;
1041 break;
1042 case Opt_resgid:
1043 if (match_int(&args[0], &option))
1044 return 0;
1045 sbi->s_resgid = option;
1046 break;
1047 case Opt_sb:
1048 /* handled by get_sb_block() instead of here */
1049 /* *sb_block = match_int(&args[0]); */
1050 break;
1051 case Opt_err_panic:
2b2d6d01
TT		 1052 clear_opt(sbi->s_mount_opt, ERRORS_CONT);
1053 clear_opt(sbi->s_mount_opt, ERRORS_RO);
1054 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
ac27a0ec
DK		 1055 break;
1056 case Opt_err_ro:
2b2d6d01
TT		 1057 clear_opt(sbi->s_mount_opt, ERRORS_CONT);
1058 clear_opt(sbi->s_mount_opt, ERRORS_PANIC);
1059 set_opt(sbi->s_mount_opt, ERRORS_RO);
ac27a0ec
DK		 1060 break;
1061 case Opt_err_cont:
2b2d6d01
TT		 1062 clear_opt(sbi->s_mount_opt, ERRORS_RO);
1063 clear_opt(sbi->s_mount_opt, ERRORS_PANIC);
1064 set_opt(sbi->s_mount_opt, ERRORS_CONT);
ac27a0ec
DK		 1065 break;
1066 case Opt_nouid32:
2b2d6d01 1067 set_opt(sbi->s_mount_opt, NO_UID32);
ac27a0ec
DK		 1068 break;
1069 case Opt_nocheck:
2b2d6d01 1070 clear_opt(sbi->s_mount_opt, CHECK);
ac27a0ec
DK		 1071 break;
1072 case Opt_debug:
2b2d6d01 1073 set_opt(sbi->s_mount_opt, DEBUG);
ac27a0ec
DK		 1074 break;
1075 case Opt_oldalloc:
2b2d6d01 1076 set_opt(sbi->s_mount_opt, OLDALLOC);
ac27a0ec
DK		 1077 break;
1078 case Opt_orlov:
2b2d6d01 1079 clear_opt(sbi->s_mount_opt, OLDALLOC);
ac27a0ec 1080 break;
617ba13b 1081#ifdef CONFIG_EXT4DEV_FS_XATTR
ac27a0ec 1082 case Opt_user_xattr:
2b2d6d01 1083 set_opt(sbi->s_mount_opt, XATTR_USER);
ac27a0ec
DK		 1084 break;
1085 case Opt_nouser_xattr:
2b2d6d01 1086 clear_opt(sbi->s_mount_opt, XATTR_USER);
ac27a0ec
DK		 1087 break;
1088#else
1089 case Opt_user_xattr:
1090 case Opt_nouser_xattr:
4776004f
TT		 1091 printk(KERN_ERR "EXT4 (no)user_xattr options "
1092 "not supported\n");
ac27a0ec
DK		 1093 break;
1094#endif
617ba13b 1095#ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
ac27a0ec
DK		 1096 case Opt_acl:
1097 set_opt(sbi->s_mount_opt, POSIX_ACL);
1098 break;
1099 case Opt_noacl:
1100 clear_opt(sbi->s_mount_opt, POSIX_ACL);
1101 break;
1102#else
1103 case Opt_acl:
1104 case Opt_noacl:
4776004f
TT		 1105 printk(KERN_ERR "EXT4 (no)acl options "
1106 "not supported\n");
ac27a0ec
DK		 1107 break;
1108#endif
1109 case Opt_reservation:
1110 set_opt(sbi->s_mount_opt, RESERVATION);
1111 break;
1112 case Opt_noreservation:
1113 clear_opt(sbi->s_mount_opt, RESERVATION);
1114 break;
1115 case Opt_journal_update:
1116 /* @@@ FIXME */
1117 /* Eventually we will want to be able to create
1118 a journal file here. For now, only allow the
1119 user to specify an existing inode to be the
1120 journal file. */
1121 if (is_remount) {
617ba13b 1122 printk(KERN_ERR "EXT4-fs: cannot specify "
ac27a0ec
DK		 1123 "journal on remount\n");
1124 return 0;
1125 }
2b2d6d01 1126 set_opt(sbi->s_mount_opt, UPDATE_JOURNAL);
ac27a0ec
DK		 1127 break;
1128 case Opt_journal_inum:
1129 if (is_remount) {
617ba13b 1130 printk(KERN_ERR "EXT4-fs: cannot specify "
ac27a0ec
DK		 1131 "journal on remount\n");
1132 return 0;
1133 }
1134 if (match_int(&args[0], &option))
1135 return 0;
1136 *inum = option;
1137 break;
1138 case Opt_journal_dev:
1139 if (is_remount) {
617ba13b 1140 printk(KERN_ERR "EXT4-fs: cannot specify "
ac27a0ec
DK		 1141 "journal on remount\n");
1142 return 0;
1143 }
1144 if (match_int(&args[0], &option))
1145 return 0;
1146 *journal_devnum = option;
1147 break;
818d276c
GS		 1148 case Opt_journal_checksum:
1149 set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM);
1150 break;
1151 case Opt_journal_async_commit:
1152 set_opt(sbi->s_mount_opt, JOURNAL_ASYNC_COMMIT);
1153 set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM);
1154 break;
ac27a0ec 1155 case Opt_noload:
2b2d6d01 1156 set_opt(sbi->s_mount_opt, NOLOAD);
ac27a0ec
DK		 1157 break;
1158 case Opt_commit:
1159 if (match_int(&args[0], &option))
1160 return 0;
1161 if (option < 0)
1162 return 0;
1163 if (option == 0)
cd02ff0b 1164 option = JBD2_DEFAULT_MAX_COMMIT_AGE;
ac27a0ec
DK		 1165 sbi->s_commit_interval = HZ * option;
1166 break;
1167 case Opt_data_journal:
617ba13b 1168 data_opt = EXT4_MOUNT_JOURNAL_DATA;
ac27a0ec
DK		 1169 goto datacheck;
1170 case Opt_data_ordered:
617ba13b 1171 data_opt = EXT4_MOUNT_ORDERED_DATA;
ac27a0ec
DK		 1172 goto datacheck;
1173 case Opt_data_writeback:
617ba13b 1174 data_opt = EXT4_MOUNT_WRITEBACK_DATA;
ac27a0ec
DK		 1175 datacheck:
1176 if (is_remount) {
617ba13b 1177 if ((sbi->s_mount_opt & EXT4_MOUNT_DATA_FLAGS)
ac27a0ec
DK		 1178 != data_opt) {
1179 printk(KERN_ERR
617ba13b 1180 "EXT4-fs: cannot change data "
ac27a0ec
DK		 1181 "mode on remount\n");
1182 return 0;
1183 }
1184 } else {
617ba13b 1185 sbi->s_mount_opt &= ~EXT4_MOUNT_DATA_FLAGS;
ac27a0ec
DK		 1186 sbi->s_mount_opt |= data_opt;
1187 }
1188 break;
1189#ifdef CONFIG_QUOTA
1190 case Opt_usrjquota:
1191 qtype = USRQUOTA;
1192 goto set_qf_name;
1193 case Opt_grpjquota:
1194 qtype = GRPQUOTA;
1195set_qf_name:
dfc5d03f
JK		 1196 if ((sb_any_quota_enabled(sb) ||
1197 sb_any_quota_suspended(sb)) &&
1198 !sbi->s_qf_names[qtype]) {
ac27a0ec 1199 printk(KERN_ERR
4776004f
TT		 1200 "EXT4-fs: Cannot change journaled "
1201 "quota options when quota turned on.\n");
ac27a0ec
DK		 1202 return 0;
1203 }
1204 qname = match_strdup(&args[0]);
1205 if (!qname) {
1206 printk(KERN_ERR
617ba13b 1207 "EXT4-fs: not enough memory for "
ac27a0ec
DK		 1208 "storing quotafile name.\n");
1209 return 0;
1210 }
1211 if (sbi->s_qf_names[qtype] &&
1212 strcmp(sbi->s_qf_names[qtype], qname)) {
1213 printk(KERN_ERR
617ba13b 1214 "EXT4-fs: %s quota file already "
ac27a0ec
DK		 1215 "specified.\n", QTYPE2NAME(qtype));
1216 kfree(qname);
1217 return 0;
1218 }
1219 sbi->s_qf_names[qtype] = qname;
1220 if (strchr(sbi->s_qf_names[qtype], '/')) {
1221 printk(KERN_ERR
617ba13b 1222 "EXT4-fs: quotafile must be on "
ac27a0ec
DK		 1223 "filesystem root.\n");
1224 kfree(sbi->s_qf_names[qtype]);
1225 sbi->s_qf_names[qtype] = NULL;
1226 return 0;
1227 }
1228 set_opt(sbi->s_mount_opt, QUOTA);
1229 break;
1230 case Opt_offusrjquota:
1231 qtype = USRQUOTA;
1232 goto clear_qf_name;
1233 case Opt_offgrpjquota:
1234 qtype = GRPQUOTA;
1235clear_qf_name:
dfc5d03f
JK		 1236 if ((sb_any_quota_enabled(sb) ||
1237 sb_any_quota_suspended(sb)) &&
1238 sbi->s_qf_names[qtype]) {
617ba13b 1239 printk(KERN_ERR "EXT4-fs: Cannot change "
2c8be6b2 1240 "journaled quota options when "
ac27a0ec
DK		 1241 "quota turned on.\n");
1242 return 0;
1243 }
1244 /*
1245 * The space will be released later when all options
1246 * are confirmed to be correct
1247 */
1248 sbi->s_qf_names[qtype] = NULL;
1249 break;
1250 case Opt_jqfmt_vfsold:
dfc5d03f
JK		 1251 qfmt = QFMT_VFS_OLD;
1252 goto set_qf_format;
ac27a0ec 1253 case Opt_jqfmt_vfsv0:
dfc5d03f
JK		 1254 qfmt = QFMT_VFS_V0;
1255set_qf_format:
1256 if ((sb_any_quota_enabled(sb) ||
1257 sb_any_quota_suspended(sb)) &&
1258 sbi->s_jquota_fmt != qfmt) {
1259 printk(KERN_ERR "EXT4-fs: Cannot change "
1260 "journaled quota options when "
1261 "quota turned on.\n");
1262 return 0;
1263 }
1264 sbi->s_jquota_fmt = qfmt;
ac27a0ec
DK		 1265 break;
1266 case Opt_quota:
1267 case Opt_usrquota:
1268 set_opt(sbi->s_mount_opt, QUOTA);
1269 set_opt(sbi->s_mount_opt, USRQUOTA);
1270 break;
1271 case Opt_grpquota:
1272 set_opt(sbi->s_mount_opt, QUOTA);
1273 set_opt(sbi->s_mount_opt, GRPQUOTA);
1274 break;
1275 case Opt_noquota:
1276 if (sb_any_quota_enabled(sb)) {
617ba13b 1277 printk(KERN_ERR "EXT4-fs: Cannot change quota "
ac27a0ec
DK		 1278 "options when quota turned on.\n");
1279 return 0;
1280 }
1281 clear_opt(sbi->s_mount_opt, QUOTA);
1282 clear_opt(sbi->s_mount_opt, USRQUOTA);
1283 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1284 break;
1285#else
1286 case Opt_quota:
1287 case Opt_usrquota:
1288 case Opt_grpquota:
cd59e7b9
JK		 1289 printk(KERN_ERR
1290 "EXT4-fs: quota options not supported.\n");
1291 break;
ac27a0ec
DK		 1292 case Opt_usrjquota:
1293 case Opt_grpjquota:
1294 case Opt_offusrjquota:
1295 case Opt_offgrpjquota:
1296 case Opt_jqfmt_vfsold:
1297 case Opt_jqfmt_vfsv0:
1298 printk(KERN_ERR
cd59e7b9 1299 "EXT4-fs: journaled quota options not "
ac27a0ec
DK		 1300 "supported.\n");
1301 break;
1302 case Opt_noquota:
1303 break;
1304#endif
1305 case Opt_abort:
1306 set_opt(sbi->s_mount_opt, ABORT);
1307 break;
1308 case Opt_barrier:
1309 if (match_int(&args[0], &option))
1310 return 0;
1311 if (option)
1312 set_opt(sbi->s_mount_opt, BARRIER);
1313 else
1314 clear_opt(sbi->s_mount_opt, BARRIER);
1315 break;
1316 case Opt_ignore:
1317 break;
1318 case Opt_resize:
1319 if (!is_remount) {
617ba13b 1320 printk("EXT4-fs: resize option only available "
ac27a0ec
DK		 1321 "for remount\n");
1322 return 0;
1323 }
1324 if (match_int(&args[0], &option) != 0)
1325 return 0;
1326 *n_blocks_count = option;
1327 break;
1328 case Opt_nobh:
1329 set_opt(sbi->s_mount_opt, NOBH);
1330 break;
1331 case Opt_bh:
1332 clear_opt(sbi->s_mount_opt, NOBH);
1333 break;
a86c6181 1334 case Opt_extents:
e4079a11
ES		 1335 if (!EXT4_HAS_INCOMPAT_FEATURE(sb,
1336 EXT4_FEATURE_INCOMPAT_EXTENTS)) {
1337 ext4_warning(sb, __func__,
1338 "extents feature not enabled "
1339 "on this filesystem, use tune2fs\n");
1340 return 0;
1341 }
2b2d6d01 1342 set_opt(sbi->s_mount_opt, EXTENTS);
a86c6181 1343 break;
1e2462f9 1344 case Opt_noextents:
c07651b5
AK		 1345 /*
1346 * When e2fsprogs support resizing an already existing
1347 * ext3 file system to greater than 2**32 we need to
1348 * add support to block allocator to handle growing
1349 * already existing block mapped inode so that blocks
1350 * allocated for them fall within 2**32
1351 */
1352 last_block = ext4_blocks_count(sbi->s_es) - 1;
1353 if (last_block > 0xffffffffULL) {
1354 printk(KERN_ERR "EXT4-fs: Filesystem too "
1355 "large to mount with "
1356 "-o noextents options\n");
1357 return 0;
1358 }
2b2d6d01 1359 clear_opt(sbi->s_mount_opt, EXTENTS);
1e2462f9 1360 break;
25ec56b5
JNC		 1361 case Opt_i_version:
1362 set_opt(sbi->s_mount_opt, I_VERSION);
1363 sb->s_flags |= MS_I_VERSION;
1364 break;
dd919b98
AK		 1365 case Opt_nodelalloc:
1366 clear_opt(sbi->s_mount_opt, DELALLOC);
1367 break;
c9de560d
AT		 1368 case Opt_mballoc:
1369 set_opt(sbi->s_mount_opt, MBALLOC);
1370 break;
1371 case Opt_nomballoc:
1372 clear_opt(sbi->s_mount_opt, MBALLOC);
1373 break;
1374 case Opt_stripe:
1375 if (match_int(&args[0], &option))
1376 return 0;
1377 if (option < 0)
1378 return 0;
1379 sbi->s_stripe = option;
1380 break;
64769240
AT		 1381 case Opt_delalloc:
1382 set_opt(sbi->s_mount_opt, DELALLOC);
1383 break;
ac27a0ec 1384 default:
2b2d6d01
TT		 1385 printk(KERN_ERR
1386 "EXT4-fs: Unrecognized mount option \"%s\" "
1387 "or missing value\n", p);
ac27a0ec
DK		 1388 return 0;
1389 }
1390 }
1391#ifdef CONFIG_QUOTA
1392 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
617ba13b 1393 if ((sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA) &&
ac27a0ec
DK		 1394 sbi->s_qf_names[USRQUOTA])
1395 clear_opt(sbi->s_mount_opt, USRQUOTA);
1396
617ba13b 1397 if ((sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA) &&
ac27a0ec
DK		 1398 sbi->s_qf_names[GRPQUOTA])
1399 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1400
1401 if ((sbi->s_qf_names[USRQUOTA] &&
617ba13b 1402 (sbi->s_mount_opt & EXT4_MOUNT_GRPQUOTA)) ||
ac27a0ec 1403 (sbi->s_qf_names[GRPQUOTA] &&
617ba13b
MC		 1404 (sbi->s_mount_opt & EXT4_MOUNT_USRQUOTA))) {
1405 printk(KERN_ERR "EXT4-fs: old and new quota "
ac27a0ec
DK		 1406 "format mixing.\n");
1407 return 0;
1408 }
1409
1410 if (!sbi->s_jquota_fmt) {
2c8be6b2 1411 printk(KERN_ERR "EXT4-fs: journaled quota format "
ac27a0ec
DK		 1412 "not specified.\n");
1413 return 0;
1414 }
1415 } else {
1416 if (sbi->s_jquota_fmt) {
2c8be6b2
JK		 1417 printk(KERN_ERR "EXT4-fs: journaled quota format "
1418 "specified with no journaling "
ac27a0ec
DK		 1419 "enabled.\n");
1420 return 0;
1421 }
1422 }
1423#endif
1424 return 1;
1425}
1426
617ba13b 1427static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
ac27a0ec
DK		 1428 int read_only)
1429{
617ba13b 1430 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec
DK		 1431 int res = 0;
1432
617ba13b 1433 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
2b2d6d01
TT		 1434 printk(KERN_ERR "EXT4-fs warning: revision level too high, "
1435 "forcing read-only mode\n");
ac27a0ec
DK		 1436 res = MS_RDONLY;
1437 }
1438 if (read_only)
1439 return res;
617ba13b 1440 if (!(sbi->s_mount_state & EXT4_VALID_FS))
2b2d6d01
TT		 1441 printk(KERN_WARNING "EXT4-fs warning: mounting unchecked fs, "
1442 "running e2fsck is recommended\n");
617ba13b 1443 else if ((sbi->s_mount_state & EXT4_ERROR_FS))
2b2d6d01
TT		 1444 printk(KERN_WARNING
1445 "EXT4-fs warning: mounting fs with errors, "
1446 "running e2fsck is recommended\n");
ac27a0ec
DK		 1447 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
1448 le16_to_cpu(es->s_mnt_count) >=
1449 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
2b2d6d01
TT		 1450 printk(KERN_WARNING
1451 "EXT4-fs warning: maximal mount count reached, "
1452 "running e2fsck is recommended\n");
ac27a0ec
DK		 1453 else if (le32_to_cpu(es->s_checkinterval) &&
1454 (le32_to_cpu(es->s_lastcheck) +
1455 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
2b2d6d01
TT		 1456 printk(KERN_WARNING
1457 "EXT4-fs warning: checktime reached, "
1458 "running e2fsck is recommended\n");
ac27a0ec
DK		 1459#if 0
1460 /* @@@ We _will_ want to clear the valid bit if we find
63f57933
AM		 1461 * inconsistencies, to force a fsck at reboot. But for
1462 * a plain journaled filesystem we can keep it set as
1463 * valid forever! :)
1464 */
216c34b2 1465 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
ac27a0ec
DK		 1466#endif
1467 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
617ba13b 1468 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
e8546d06 1469 le16_add_cpu(&es->s_mnt_count, 1);
ac27a0ec 1470 es->s_mtime = cpu_to_le32(get_seconds());
617ba13b
MC		 1471 ext4_update_dynamic_rev(sb);
1472 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
ac27a0ec 1473
617ba13b 1474 ext4_commit_super(sb, es, 1);
ac27a0ec 1475 if (test_opt(sb, DEBUG))
617ba13b 1476 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%lu, "
ac27a0ec
DK		 1477 "bpg=%lu, ipg=%lu, mo=%04lx]\n",
1478 sb->s_blocksize,
1479 sbi->s_groups_count,
617ba13b
MC		 1480 EXT4_BLOCKS_PER_GROUP(sb),
1481 EXT4_INODES_PER_GROUP(sb),
ac27a0ec
DK		 1482 sbi->s_mount_opt);
1483
05496769
TT		 1484 printk(KERN_INFO "EXT4 FS on %s, %s journal on %s\n",
1485 sb->s_id, EXT4_SB(sb)->s_journal->j_inode ? "internal" :
1486 "external", EXT4_SB(sb)->s_journal->j_devname);
ac27a0ec
DK		 1487 return res;
1488}
1489
772cb7c8
JS		 1490static int ext4_fill_flex_info(struct super_block *sb)
1491{
1492 struct ext4_sb_info *sbi = EXT4_SB(sb);
1493 struct ext4_group_desc *gdp = NULL;
1494 struct buffer_head *bh;
1495 ext4_group_t flex_group_count;
1496 ext4_group_t flex_group;
1497 int groups_per_flex = 0;
1498 __u64 block_bitmap = 0;
1499 int i;
1500
1501 if (!sbi->s_es->s_log_groups_per_flex) {
1502 sbi->s_log_groups_per_flex = 0;
1503 return 1;
1504 }
1505
1506 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
1507 groups_per_flex = 1 << sbi->s_log_groups_per_flex;
1508
c62a11fd
FB		 1509 /* We allocate both existing and potentially added groups */
1510 flex_group_count = ((sbi->s_groups_count + groups_per_flex - 1) +
1511 ((sbi->s_es->s_reserved_gdt_blocks +1 ) <<
1512 EXT4_DESC_PER_BLOCK_BITS(sb))) /
1513 groups_per_flex;
ec05e868 1514 sbi->s_flex_groups = kzalloc(flex_group_count *
772cb7c8
JS		 1515 sizeof(struct flex_groups), GFP_KERNEL);
1516 if (sbi->s_flex_groups == NULL) {
ec05e868
LZ		 1517 printk(KERN_ERR "EXT4-fs: not enough memory for "
1518 "%lu flex groups\n", flex_group_count);
772cb7c8
JS		 1519 goto failed;
1520 }
772cb7c8
JS		 1521
1522 gdp = ext4_get_group_desc(sb, 1, &bh);
1523 block_bitmap = ext4_block_bitmap(sb, gdp) - 1;
1524
1525 for (i = 0; i < sbi->s_groups_count; i++) {
1526 gdp = ext4_get_group_desc(sb, i, &bh);
1527
1528 flex_group = ext4_flex_group(sbi, i);
1529 sbi->s_flex_groups[flex_group].free_inodes +=
1530 le16_to_cpu(gdp->bg_free_inodes_count);
1531 sbi->s_flex_groups[flex_group].free_blocks +=
1532 le16_to_cpu(gdp->bg_free_blocks_count);
1533 }
1534
1535 return 1;
1536failed:
1537 return 0;
1538}
1539
717d50e4
AD		 1540__le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
1541 struct ext4_group_desc *gdp)
1542{
1543 __u16 crc = 0;
1544
1545 if (sbi->s_es->s_feature_ro_compat &
1546 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) {
1547 int offset = offsetof(struct ext4_group_desc, bg_checksum);
1548 __le32 le_group = cpu_to_le32(block_group);
1549
1550 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
1551 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
1552 crc = crc16(crc, (__u8 *)gdp, offset);
1553 offset += sizeof(gdp->bg_checksum); /* skip checksum */
1554 /* for checksum of struct ext4_group_desc do the rest...*/
1555 if ((sbi->s_es->s_feature_incompat &
1556 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) &&
1557 offset < le16_to_cpu(sbi->s_es->s_desc_size))
1558 crc = crc16(crc, (__u8 *)gdp + offset,
1559 le16_to_cpu(sbi->s_es->s_desc_size) -
1560 offset);
1561 }
1562
1563 return cpu_to_le16(crc);
1564}
1565
1566int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 block_group,
1567 struct ext4_group_desc *gdp)
1568{
1569 if ((sbi->s_es->s_feature_ro_compat &
1570 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) &&
1571 (gdp->bg_checksum != ext4_group_desc_csum(sbi, block_group, gdp)))
1572 return 0;
1573
1574 return 1;
1575}
1576
ac27a0ec 1577/* Called at mount-time, super-block is locked */
197cd65a 1578static int ext4_check_descriptors(struct super_block *sb)
ac27a0ec 1579{
617ba13b
MC		 1580 struct ext4_sb_info *sbi = EXT4_SB(sb);
1581 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
1582 ext4_fsblk_t last_block;
bd81d8ee
LV		 1583 ext4_fsblk_t block_bitmap;
1584 ext4_fsblk_t inode_bitmap;
1585 ext4_fsblk_t inode_table;
ce421581 1586 int flexbg_flag = 0;
fd2d4291 1587 ext4_group_t i;
ac27a0ec 1588
ce421581
JS		 1589 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
1590 flexbg_flag = 1;
1591
af5bc92d 1592 ext4_debug("Checking group descriptors");
ac27a0ec 1593
197cd65a
AM		 1594 for (i = 0; i < sbi->s_groups_count; i++) {
1595 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
1596
ce421581 1597 if (i == sbi->s_groups_count - 1 || flexbg_flag)
bd81d8ee 1598 last_block = ext4_blocks_count(sbi->s_es) - 1;
ac27a0ec
DK		 1599 else
1600 last_block = first_block +
617ba13b 1601 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
ac27a0ec 1602
8fadc143 1603 block_bitmap = ext4_block_bitmap(sb, gdp);
2b2d6d01 1604 if (block_bitmap < first_block || block_bitmap > last_block) {
c19204b0
JB		 1605 printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: "
1606 "Block bitmap for group %lu not in group "
1607 "(block %llu)!", i, block_bitmap);
ac27a0ec
DK		 1608 return 0;
1609 }
8fadc143 1610 inode_bitmap = ext4_inode_bitmap(sb, gdp);
2b2d6d01 1611 if (inode_bitmap < first_block || inode_bitmap > last_block) {
c19204b0
JB		 1612 printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: "
1613 "Inode bitmap for group %lu not in group "
1614 "(block %llu)!", i, inode_bitmap);
ac27a0ec
DK		 1615 return 0;
1616 }
8fadc143 1617 inode_table = ext4_inode_table(sb, gdp);
bd81d8ee 1618 if (inode_table < first_block ||
2b2d6d01 1619 inode_table + sbi->s_itb_per_group - 1 > last_block) {
c19204b0
JB		 1620 printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: "
1621 "Inode table for group %lu not in group "
1622 "(block %llu)!", i, inode_table);
ac27a0ec
DK		 1623 return 0;
1624 }
b5f10eed 1625 spin_lock(sb_bgl_lock(sbi, i));
717d50e4 1626 if (!ext4_group_desc_csum_verify(sbi, i, gdp)) {
c19204b0
JB		 1627 printk(KERN_ERR "EXT4-fs: ext4_check_descriptors: "
1628 "Checksum for group %lu failed (%u!=%u)\n",
1629 i, le16_to_cpu(ext4_group_desc_csum(sbi, i,
1630 gdp)), le16_to_cpu(gdp->bg_checksum));
7ee1ec4c
LZ		 1631 if (!(sb->s_flags & MS_RDONLY)) {
1632 spin_unlock(sb_bgl_lock(sbi, i));
8a266467 1633 return 0;
7ee1ec4c 1634 }
717d50e4 1635 }
b5f10eed 1636 spin_unlock(sb_bgl_lock(sbi, i));
ce421581
JS		 1637 if (!flexbg_flag)
1638 first_block += EXT4_BLOCKS_PER_GROUP(sb);
ac27a0ec
DK		 1639 }
1640
bd81d8ee 1641 ext4_free_blocks_count_set(sbi->s_es, ext4_count_free_blocks(sb));
2b2d6d01 1642 sbi->s_es->s_free_inodes_count = cpu_to_le32(ext4_count_free_inodes(sb));
ac27a0ec
DK		 1643 return 1;
1644}
1645
617ba13b 1646/* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
ac27a0ec
DK		 1647 * the superblock) which were deleted from all directories, but held open by
1648 * a process at the time of a crash. We walk the list and try to delete these
1649 * inodes at recovery time (only with a read-write filesystem).
1650 *
1651 * In order to keep the orphan inode chain consistent during traversal (in
1652 * case of crash during recovery), we link each inode into the superblock
1653 * orphan list_head and handle it the same way as an inode deletion during
1654 * normal operation (which journals the operations for us).
1655 *
1656 * We only do an iget() and an iput() on each inode, which is very safe if we
1657 * accidentally point at an in-use or already deleted inode. The worst that
1658 * can happen in this case is that we get a "bit already cleared" message from
617ba13b 1659 * ext4_free_inode(). The only reason we would point at a wrong inode is if
ac27a0ec
DK		 1660 * e2fsck was run on this filesystem, and it must have already done the orphan
1661 * inode cleanup for us, so we can safely abort without any further action.
1662 */
2b2d6d01
TT		 1663static void ext4_orphan_cleanup(struct super_block *sb,
1664 struct ext4_super_block *es)
ac27a0ec
DK		 1665{
1666 unsigned int s_flags = sb->s_flags;
1667 int nr_orphans = 0, nr_truncates = 0;
1668#ifdef CONFIG_QUOTA
1669 int i;
1670#endif
1671 if (!es->s_last_orphan) {
1672 jbd_debug(4, "no orphan inodes to clean up\n");
1673 return;
1674 }
1675
a8f48a95
ES		 1676 if (bdev_read_only(sb->s_bdev)) {
1677 printk(KERN_ERR "EXT4-fs: write access "
1678 "unavailable, skipping orphan cleanup.\n");
1679 return;
1680 }
1681
617ba13b 1682 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
ac27a0ec
DK		 1683 if (es->s_last_orphan)
1684 jbd_debug(1, "Errors on filesystem, "
1685 "clearing orphan list.\n");
1686 es->s_last_orphan = 0;
1687 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1688 return;
1689 }
1690
1691 if (s_flags & MS_RDONLY) {
617ba13b 1692 printk(KERN_INFO "EXT4-fs: %s: orphan cleanup on readonly fs\n",
ac27a0ec
DK		 1693 sb->s_id);
1694 sb->s_flags &= ~MS_RDONLY;
1695 }
1696#ifdef CONFIG_QUOTA
1697 /* Needed for iput() to work correctly and not trash data */
1698 sb->s_flags |= MS_ACTIVE;
1699 /* Turn on quotas so that they are updated correctly */
1700 for (i = 0; i < MAXQUOTAS; i++) {
617ba13b
MC		 1701 if (EXT4_SB(sb)->s_qf_names[i]) {
1702 int ret = ext4_quota_on_mount(sb, i);
ac27a0ec
DK		 1703 if (ret < 0)
1704 printk(KERN_ERR
2c8be6b2 1705 "EXT4-fs: Cannot turn on journaled "
ac27a0ec
DK		 1706 "quota: error %d\n", ret);
1707 }
1708 }
1709#endif
1710
1711 while (es->s_last_orphan) {
1712 struct inode *inode;
1713
97bd42b9
JB		 1714 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
1715 if (IS_ERR(inode)) {
ac27a0ec
DK		 1716 es->s_last_orphan = 0;
1717 break;
1718 }
1719
617ba13b 1720 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
ac27a0ec
DK		 1721 DQUOT_INIT(inode);
1722 if (inode->i_nlink) {
1723 printk(KERN_DEBUG
e5f8eab8 1724 "%s: truncating inode %lu to %lld bytes\n",
46e665e9 1725 __func__, inode->i_ino, inode->i_size);
e5f8eab8 1726 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
ac27a0ec 1727 inode->i_ino, inode->i_size);
617ba13b 1728 ext4_truncate(inode);
ac27a0ec
DK		 1729 nr_truncates++;
1730 } else {
1731 printk(KERN_DEBUG
1732 "%s: deleting unreferenced inode %lu\n",
46e665e9 1733 __func__, inode->i_ino);
ac27a0ec
DK		 1734 jbd_debug(2, "deleting unreferenced inode %lu\n",
1735 inode->i_ino);
1736 nr_orphans++;
1737 }
1738 iput(inode); /* The delete magic happens here! */
1739 }
1740
2b2d6d01 1741#define PLURAL(x) (x), ((x) == 1) ? "" : "s"
ac27a0ec
DK		 1742
1743 if (nr_orphans)
617ba13b 1744 printk(KERN_INFO "EXT4-fs: %s: %d orphan inode%s deleted\n",
ac27a0ec
DK		 1745 sb->s_id, PLURAL(nr_orphans));
1746 if (nr_truncates)
617ba13b 1747 printk(KERN_INFO "EXT4-fs: %s: %d truncate%s cleaned up\n",
ac27a0ec
DK		 1748 sb->s_id, PLURAL(nr_truncates));
1749#ifdef CONFIG_QUOTA
1750 /* Turn quotas off */
1751 for (i = 0; i < MAXQUOTAS; i++) {
1752 if (sb_dqopt(sb)->files[i])
6f28e087 1753 vfs_quota_off(sb, i, 0);
ac27a0ec
DK		 1754 }
1755#endif
1756 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
1757}
cd2291a4
ES		 1758/*
1759 * Maximal extent format file size.
1760 * Resulting logical blkno at s_maxbytes must fit in our on-disk
1761 * extent format containers, within a sector_t, and within i_blocks
1762 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
1763 * so that won't be a limiting factor.
1764 *
1765 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
1766 */
1767static loff_t ext4_max_size(int blkbits)
1768{
1769 loff_t res;
1770 loff_t upper_limit = MAX_LFS_FILESIZE;
1771
1772 /* small i_blocks in vfs inode? */
1773 if (sizeof(blkcnt_t) < sizeof(u64)) {
1774 /*
1775 * CONFIG_LSF is not enabled implies the inode
1776 * i_block represent total blocks in 512 bytes
1777 * 32 == size of vfs inode i_blocks * 8
1778 */
1779 upper_limit = (1LL << 32) - 1;
1780
1781 /* total blocks in file system block size */
1782 upper_limit >>= (blkbits - 9);
1783 upper_limit <<= blkbits;
1784 }
1785
1786 /* 32-bit extent-start container, ee_block */
1787 res = 1LL << 32;
1788 res <<= blkbits;
1789 res -= 1;
1790
1791 /* Sanity check against vm- & vfs- imposed limits */
1792 if (res > upper_limit)
1793 res = upper_limit;
1794
1795 return res;
1796}
ac27a0ec 1797
ac27a0ec 1798/*
cd2291a4 1799 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
0fc1b451
AK		 1800 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
1801 * We need to be 1 filesystem block less than the 2^48 sector limit.
ac27a0ec 1802 */
cd2291a4 1803static loff_t ext4_max_bitmap_size(int bits)
ac27a0ec 1804{
617ba13b 1805 loff_t res = EXT4_NDIR_BLOCKS;
0fc1b451
AK		 1806 int meta_blocks;
1807 loff_t upper_limit;
1808 /* This is calculated to be the largest file size for a
cd2291a4 1809 * dense, bitmapped file such that the total number of
ac27a0ec 1810 * sectors in the file, including data and all indirect blocks,
0fc1b451
AK		 1811 * does not exceed 2^48 -1
1812 * __u32 i_blocks_lo and _u16 i_blocks_high representing the
1813 * total number of 512 bytes blocks of the file
1814 */
1815
1816 if (sizeof(blkcnt_t) < sizeof(u64)) {
1817 /*
1818 * CONFIG_LSF is not enabled implies the inode
1819 * i_block represent total blocks in 512 bytes
1820 * 32 == size of vfs inode i_blocks * 8
1821 */
1822 upper_limit = (1LL << 32) - 1;
1823
1824 /* total blocks in file system block size */
1825 upper_limit >>= (bits - 9);
1826
1827 } else {
8180a562
AK		 1828 /*
1829 * We use 48 bit ext4_inode i_blocks
1830 * With EXT4_HUGE_FILE_FL set the i_blocks
1831 * represent total number of blocks in
1832 * file system block size
1833 */
0fc1b451
AK		 1834 upper_limit = (1LL << 48) - 1;
1835
0fc1b451
AK		 1836 }
1837
1838 /* indirect blocks */
1839 meta_blocks = 1;
1840 /* double indirect blocks */
1841 meta_blocks += 1 + (1LL << (bits-2));
1842 /* tripple indirect blocks */
1843 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
1844
1845 upper_limit -= meta_blocks;
1846 upper_limit <<= bits;
ac27a0ec
DK		 1847
1848 res += 1LL << (bits-2);
1849 res += 1LL << (2*(bits-2));
1850 res += 1LL << (3*(bits-2));
1851 res <<= bits;
1852 if (res > upper_limit)
1853 res = upper_limit;
0fc1b451
AK		 1854
1855 if (res > MAX_LFS_FILESIZE)
1856 res = MAX_LFS_FILESIZE;
1857
ac27a0ec
DK		 1858 return res;
1859}
1860
617ba13b 1861static ext4_fsblk_t descriptor_loc(struct super_block *sb,
70bbb3e0 1862 ext4_fsblk_t logical_sb_block, int nr)
ac27a0ec 1863{
617ba13b 1864 struct ext4_sb_info *sbi = EXT4_SB(sb);
fd2d4291 1865 ext4_group_t bg, first_meta_bg;
ac27a0ec
DK		 1866 int has_super = 0;
1867
1868 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
1869
617ba13b 1870 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
ac27a0ec 1871 nr < first_meta_bg)
70bbb3e0 1872 return logical_sb_block + nr + 1;
ac27a0ec 1873 bg = sbi->s_desc_per_block * nr;
617ba13b 1874 if (ext4_bg_has_super(sb, bg))
ac27a0ec 1875 has_super = 1;
617ba13b 1876 return (has_super + ext4_group_first_block_no(sb, bg));
ac27a0ec
DK		 1877}
1878
c9de560d
AT		 1879/**
1880 * ext4_get_stripe_size: Get the stripe size.
1881 * @sbi: In memory super block info
1882 *
1883 * If we have specified it via mount option, then
1884 * use the mount option value. If the value specified at mount time is
1885 * greater than the blocks per group use the super block value.
1886 * If the super block value is greater than blocks per group return 0.
1887 * Allocator needs it be less than blocks per group.
1888 *
1889 */
1890static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
1891{
1892 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
1893 unsigned long stripe_width =
1894 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
1895
1896 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
1897 return sbi->s_stripe;
1898
1899 if (stripe_width <= sbi->s_blocks_per_group)
1900 return stripe_width;
1901
1902 if (stride <= sbi->s_blocks_per_group)
1903 return stride;
1904
1905 return 0;
1906}
ac27a0ec 1907
2b2d6d01 1908static int ext4_fill_super(struct super_block *sb, void *data, int silent)
7477827f
AK		 1909 __releases(kernel_lock)
1910 __acquires(kernel_lock)
1d03ec98 1911
ac27a0ec 1912{
2b2d6d01 1913 struct buffer_head *bh;
617ba13b
MC		 1914 struct ext4_super_block *es = NULL;
1915 struct ext4_sb_info *sbi;
1916 ext4_fsblk_t block;
1917 ext4_fsblk_t sb_block = get_sb_block(&data);
70bbb3e0 1918 ext4_fsblk_t logical_sb_block;
ac27a0ec
DK		 1919 unsigned long offset = 0;
1920 unsigned int journal_inum = 0;
1921 unsigned long journal_devnum = 0;
1922 unsigned long def_mount_opts;
1923 struct inode *root;
9f6200bb 1924 char *cp;
1d1fe1ee 1925 int ret = -EINVAL;
ac27a0ec 1926 int blocksize;
ac27a0ec
DK		 1927 int db_count;
1928 int i;
1929 int needs_recovery;
1930 __le32 features;
bd81d8ee 1931 __u64 blocks_count;
833f4077 1932 int err;
ac27a0ec
DK		 1933
1934 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
1935 if (!sbi)
1936 return -ENOMEM;
1937 sb->s_fs_info = sbi;
1938 sbi->s_mount_opt = 0;
617ba13b
MC		 1939 sbi->s_resuid = EXT4_DEF_RESUID;
1940 sbi->s_resgid = EXT4_DEF_RESGID;
d9c9bef1 1941 sbi->s_sb_block = sb_block;
ac27a0ec
DK		 1942
1943 unlock_kernel();
1944
9f6200bb
TT		 1945 /* Cleanup superblock name */
1946 for (cp = sb->s_id; (cp = strchr(cp, '/'));)
1947 *cp = '!';
1948
617ba13b 1949 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
ac27a0ec 1950 if (!blocksize) {
617ba13b 1951 printk(KERN_ERR "EXT4-fs: unable to set blocksize\n");
ac27a0ec
DK		 1952 goto out_fail;
1953 }
1954
1955 /*
617ba13b 1956 * The ext4 superblock will not be buffer aligned for other than 1kB
ac27a0ec
DK		 1957 * block sizes. We need to calculate the offset from buffer start.
1958 */
617ba13b 1959 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
70bbb3e0
AM		 1960 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
1961 offset = do_div(logical_sb_block, blocksize);
ac27a0ec 1962 } else {
70bbb3e0 1963 logical_sb_block = sb_block;
ac27a0ec
DK		 1964 }
1965
70bbb3e0 1966 if (!(bh = sb_bread(sb, logical_sb_block))) {
2b2d6d01 1967 printk(KERN_ERR "EXT4-fs: unable to read superblock\n");
ac27a0ec
DK		 1968 goto out_fail;
1969 }
1970 /*
1971 * Note: s_es must be initialized as soon as possible because
617ba13b 1972 * some ext4 macro-instructions depend on its value
ac27a0ec 1973 */
617ba13b 1974 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
ac27a0ec
DK		 1975 sbi->s_es = es;
1976 sb->s_magic = le16_to_cpu(es->s_magic);
617ba13b
MC		 1977 if (sb->s_magic != EXT4_SUPER_MAGIC)
1978 goto cantfind_ext4;
ac27a0ec
DK		 1979
1980 /* Set defaults before we parse the mount options */
1981 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
617ba13b 1982 if (def_mount_opts & EXT4_DEFM_DEBUG)
ac27a0ec 1983 set_opt(sbi->s_mount_opt, DEBUG);
617ba13b 1984 if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
ac27a0ec 1985 set_opt(sbi->s_mount_opt, GRPID);
617ba13b 1986 if (def_mount_opts & EXT4_DEFM_UID16)
ac27a0ec 1987 set_opt(sbi->s_mount_opt, NO_UID32);
2e7842b8 1988#ifdef CONFIG_EXT4DEV_FS_XATTR
617ba13b 1989 if (def_mount_opts & EXT4_DEFM_XATTR_USER)
ac27a0ec 1990 set_opt(sbi->s_mount_opt, XATTR_USER);
2e7842b8
HD		 1991#endif
1992#ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
617ba13b 1993 if (def_mount_opts & EXT4_DEFM_ACL)
ac27a0ec 1994 set_opt(sbi->s_mount_opt, POSIX_ACL);
2e7842b8 1995#endif
617ba13b
MC		 1996 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
1997 sbi->s_mount_opt |= EXT4_MOUNT_JOURNAL_DATA;
1998 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
1999 sbi->s_mount_opt |= EXT4_MOUNT_ORDERED_DATA;
2000 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
2001 sbi->s_mount_opt |= EXT4_MOUNT_WRITEBACK_DATA;
2002
2003 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
ac27a0ec 2004 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
bb4f397a 2005 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
ceea16bf 2006 set_opt(sbi->s_mount_opt, ERRORS_CONT);
bb4f397a
AK		 2007 else
2008 set_opt(sbi->s_mount_opt, ERRORS_RO);
ac27a0ec
DK		 2009
2010 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
2011 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
2012
2013 set_opt(sbi->s_mount_opt, RESERVATION);
571640ca 2014 set_opt(sbi->s_mount_opt, BARRIER);
ac27a0ec 2015
1e2462f9
MC		 2016 /*
2017 * turn on extents feature by default in ext4 filesystem
e4079a11
ES		 2018 * only if feature flag already set by mkfs or tune2fs.
2019 * Use -o noextents to turn it off
1e2462f9 2020 */
e4079a11
ES		 2021 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS))
2022 set_opt(sbi->s_mount_opt, EXTENTS);
2023 else
2024 ext4_warning(sb, __func__,
2025 "extents feature not enabled on this filesystem, "
2026 "use tune2fs.\n");
3dbd0ede 2027 /*
e4079a11
ES		 2028 * turn on mballoc code by default in ext4 filesystem
2029 * Use -o nomballoc to turn it off
3dbd0ede
AK		 2030 */
2031 set_opt(sbi->s_mount_opt, MBALLOC);
1e2462f9 2032
dd919b98
AK		 2033 /*
2034 * enable delayed allocation by default
2035 * Use -o nodelalloc to turn it off
2036 */
2037 set_opt(sbi->s_mount_opt, DELALLOC);
2038
2039
2b2d6d01
TT		 2040 if (!parse_options((char *) data, sb, &journal_inum, &journal_devnum,
2041 NULL, 0))
ac27a0ec
DK		 2042 goto failed_mount;
2043
2044 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
617ba13b 2045 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec 2046
617ba13b
MC		 2047 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
2048 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
2049 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
2050 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
ac27a0ec 2051 printk(KERN_WARNING
617ba13b 2052 "EXT4-fs warning: feature flags set on rev 0 fs, "
ac27a0ec 2053 "running e2fsck is recommended\n");
469108ff
TT		 2054
2055 /*
2056 * Since ext4 is still considered development code, we require
2057 * that the TEST_FILESYS flag in s->flags be set.
2058 */
2059 if (!(le32_to_cpu(es->s_flags) & EXT2_FLAGS_TEST_FILESYS)) {
2060 printk(KERN_WARNING "EXT4-fs: %s: not marked "
2061 "OK to use with test code.\n", sb->s_id);
2062 goto failed_mount;
2063 }
2064
ac27a0ec
DK		 2065 /*
2066 * Check feature flags regardless of the revision level, since we
2067 * previously didn't change the revision level when setting the flags,
2068 * so there is a chance incompat flags are set on a rev 0 filesystem.
2069 */
617ba13b 2070 features = EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP);
ac27a0ec 2071 if (features) {
617ba13b 2072 printk(KERN_ERR "EXT4-fs: %s: couldn't mount because of "
ac27a0ec
DK		 2073 "unsupported optional features (%x).\n",
2074 sb->s_id, le32_to_cpu(features));
2075 goto failed_mount;
2076 }
617ba13b 2077 features = EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP);
ac27a0ec 2078 if (!(sb->s_flags & MS_RDONLY) && features) {
617ba13b 2079 printk(KERN_ERR "EXT4-fs: %s: couldn't mount RDWR because of "
ac27a0ec
DK		 2080 "unsupported optional features (%x).\n",
2081 sb->s_id, le32_to_cpu(features));
2082 goto failed_mount;
2083 }
0fc1b451
AK		 2084 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) {
2085 /*
2086 * Large file size enabled file system can only be
2087 * mount if kernel is build with CONFIG_LSF
2088 */
2089 if (sizeof(root->i_blocks) < sizeof(u64) &&
2090 !(sb->s_flags & MS_RDONLY)) {
2091 printk(KERN_ERR "EXT4-fs: %s: Filesystem with huge "
2092 "files cannot be mounted read-write "
2093 "without CONFIG_LSF.\n", sb->s_id);
2094 goto failed_mount;
2095 }
2096 }
ac27a0ec
DK		 2097 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
2098
617ba13b
MC		 2099 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
2100 blocksize > EXT4_MAX_BLOCK_SIZE) {
ac27a0ec 2101 printk(KERN_ERR
617ba13b 2102 "EXT4-fs: Unsupported filesystem blocksize %d on %s.\n",
ac27a0ec
DK		 2103 blocksize, sb->s_id);
2104 goto failed_mount;
2105 }
2106
ac27a0ec 2107 if (sb->s_blocksize != blocksize) {
ce40733c
AK		 2108
2109 /* Validate the filesystem blocksize */
2110 if (!sb_set_blocksize(sb, blocksize)) {
2111 printk(KERN_ERR "EXT4-fs: bad block size %d.\n",
2112 blocksize);
ac27a0ec
DK		 2113 goto failed_mount;
2114 }
2115
2b2d6d01 2116 brelse(bh);
70bbb3e0
AM		 2117 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
2118 offset = do_div(logical_sb_block, blocksize);
2119 bh = sb_bread(sb, logical_sb_block);
ac27a0ec
DK		 2120 if (!bh) {
2121 printk(KERN_ERR
617ba13b 2122 "EXT4-fs: Can't read superblock on 2nd try.\n");
ac27a0ec
DK		 2123 goto failed_mount;
2124 }
617ba13b 2125 es = (struct ext4_super_block *)(((char *)bh->b_data) + offset);
ac27a0ec 2126 sbi->s_es = es;
617ba13b 2127 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
2b2d6d01
TT		 2128 printk(KERN_ERR
2129 "EXT4-fs: Magic mismatch, very weird !\n");
ac27a0ec
DK		 2130 goto failed_mount;
2131 }
2132 }
2133
e2b46574 2134 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits);
617ba13b 2135 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits);
ac27a0ec 2136
617ba13b
MC		 2137 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
2138 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
2139 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
ac27a0ec
DK		 2140 } else {
2141 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
2142 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
617ba13b 2143 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
1330593e 2144 (!is_power_of_2(sbi->s_inode_size)) ||
ac27a0ec 2145 (sbi->s_inode_size > blocksize)) {
2b2d6d01
TT		 2146 printk(KERN_ERR
2147 "EXT4-fs: unsupported inode size: %d\n",
2148 sbi->s_inode_size);
ac27a0ec
DK		 2149 goto failed_mount;
2150 }
ef7f3835
KS		 2151 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
2152 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
ac27a0ec 2153 }
0d1ee42f
AR		 2154 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
2155 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
8fadc143 2156 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
0d1ee42f 2157 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
d8ea6cf8 2158 !is_power_of_2(sbi->s_desc_size)) {
0d1ee42f 2159 printk(KERN_ERR
8fadc143 2160 "EXT4-fs: unsupported descriptor size %lu\n",
0d1ee42f
AR		 2161 sbi->s_desc_size);
2162 goto failed_mount;
2163 }
2164 } else
2165 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
ac27a0ec 2166 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
ac27a0ec 2167 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
b47b6f38 2168 if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
617ba13b
MC		 2169 goto cantfind_ext4;
2170 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
ac27a0ec 2171 if (sbi->s_inodes_per_block == 0)
617ba13b 2172 goto cantfind_ext4;
ac27a0ec
DK		 2173 sbi->s_itb_per_group = sbi->s_inodes_per_group /
2174 sbi->s_inodes_per_block;
0d1ee42f 2175 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
ac27a0ec
DK		 2176 sbi->s_sbh = bh;
2177 sbi->s_mount_state = le16_to_cpu(es->s_state);
e57aa839
FW		 2178 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
2179 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
2b2d6d01 2180 for (i = 0; i < 4; i++)
ac27a0ec
DK		 2181 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
2182 sbi->s_def_hash_version = es->s_def_hash_version;
2183
2184 if (sbi->s_blocks_per_group > blocksize * 8) {
2b2d6d01
TT		 2185 printk(KERN_ERR
2186 "EXT4-fs: #blocks per group too big: %lu\n",
2187 sbi->s_blocks_per_group);
ac27a0ec
DK		 2188 goto failed_mount;
2189 }
ac27a0ec 2190 if (sbi->s_inodes_per_group > blocksize * 8) {
2b2d6d01
TT		 2191 printk(KERN_ERR
2192 "EXT4-fs: #inodes per group too big: %lu\n",
2193 sbi->s_inodes_per_group);
ac27a0ec
DK		 2194 goto failed_mount;
2195 }
2196
bd81d8ee 2197 if (ext4_blocks_count(es) >
ac27a0ec 2198 (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) {
617ba13b 2199 printk(KERN_ERR "EXT4-fs: filesystem on %s:"
ac27a0ec
DK		 2200 " too large to mount safely\n", sb->s_id);
2201 if (sizeof(sector_t) < 8)
617ba13b 2202 printk(KERN_WARNING "EXT4-fs: CONFIG_LBD not "
ac27a0ec
DK		 2203 "enabled\n");
2204 goto failed_mount;
2205 }
2206
617ba13b
MC		 2207 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
2208 goto cantfind_ext4;
e7c95593
ES		 2209
2210 /* ensure blocks_count calculation below doesn't sign-extend */
2211 if (ext4_blocks_count(es) + EXT4_BLOCKS_PER_GROUP(sb) <
2212 le32_to_cpu(es->s_first_data_block) + 1) {
2213 printk(KERN_WARNING "EXT4-fs: bad geometry: block count %llu, "
2214 "first data block %u, blocks per group %lu\n",
2215 ext4_blocks_count(es),
2216 le32_to_cpu(es->s_first_data_block),
2217 EXT4_BLOCKS_PER_GROUP(sb));
2218 goto failed_mount;
2219 }
bd81d8ee
LV		 2220 blocks_count = (ext4_blocks_count(es) -
2221 le32_to_cpu(es->s_first_data_block) +
2222 EXT4_BLOCKS_PER_GROUP(sb) - 1);
2223 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
2224 sbi->s_groups_count = blocks_count;
617ba13b
MC		 2225 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
2226 EXT4_DESC_PER_BLOCK(sb);
2b2d6d01 2227 sbi->s_group_desc = kmalloc(db_count * sizeof(struct buffer_head *),
ac27a0ec
DK		 2228 GFP_KERNEL);
2229 if (sbi->s_group_desc == NULL) {
2b2d6d01 2230 printk(KERN_ERR "EXT4-fs: not enough memory\n");
ac27a0ec
DK		 2231 goto failed_mount;
2232 }
2233
9f6200bb
TT		 2234 if (ext4_proc_root)
2235 sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);
2236
ac27a0ec
DK		 2237 bgl_lock_init(&sbi->s_blockgroup_lock);
2238
2239 for (i = 0; i < db_count; i++) {
70bbb3e0 2240 block = descriptor_loc(sb, logical_sb_block, i);
ac27a0ec
DK		 2241 sbi->s_group_desc[i] = sb_bread(sb, block);
2242 if (!sbi->s_group_desc[i]) {
2b2d6d01
TT		 2243 printk(KERN_ERR "EXT4-fs: "
2244 "can't read group descriptor %d\n", i);
ac27a0ec
DK		 2245 db_count = i;
2246 goto failed_mount2;
2247 }
2248 }
2b2d6d01 2249 if (!ext4_check_descriptors(sb)) {
617ba13b 2250 printk(KERN_ERR "EXT4-fs: group descriptors corrupted!\n");
ac27a0ec
DK		 2251 goto failed_mount2;
2252 }
772cb7c8
JS		 2253 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
2254 if (!ext4_fill_flex_info(sb)) {
2255 printk(KERN_ERR
2256 "EXT4-fs: unable to initialize "
2257 "flex_bg meta info!\n");
2258 goto failed_mount2;
2259 }
2260
ac27a0ec
DK		 2261 sbi->s_gdb_count = db_count;
2262 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
2263 spin_lock_init(&sbi->s_next_gen_lock);
2264
833f4077
PZ		 2265 err = percpu_counter_init(&sbi->s_freeblocks_counter,
2266 ext4_count_free_blocks(sb));
2267 if (!err) {
2268 err = percpu_counter_init(&sbi->s_freeinodes_counter,
2269 ext4_count_free_inodes(sb));
2270 }
2271 if (!err) {
2272 err = percpu_counter_init(&sbi->s_dirs_counter,
2273 ext4_count_dirs(sb));
2274 }
6bc6e63f
AK		 2275 if (!err) {
2276 err = percpu_counter_init(&sbi->s_dirtyblocks_counter, 0);
2277 }
833f4077
PZ		 2278 if (err) {
2279 printk(KERN_ERR "EXT4-fs: insufficient memory\n");
2280 goto failed_mount3;
2281 }
ac27a0ec
DK		 2282
2283 /* per fileystem reservation list head & lock */
2284 spin_lock_init(&sbi->s_rsv_window_lock);
2285 sbi->s_rsv_window_root = RB_ROOT;
2286 /* Add a single, static dummy reservation to the start of the
2287 * reservation window list --- it gives us a placeholder for
2288 * append-at-start-of-list which makes the allocation logic
2289 * _much_ simpler. */
617ba13b
MC		 2290 sbi->s_rsv_window_head.rsv_start = EXT4_RESERVE_WINDOW_NOT_ALLOCATED;
2291 sbi->s_rsv_window_head.rsv_end = EXT4_RESERVE_WINDOW_NOT_ALLOCATED;
ac27a0ec
DK		 2292 sbi->s_rsv_window_head.rsv_alloc_hit = 0;
2293 sbi->s_rsv_window_head.rsv_goal_size = 0;
617ba13b 2294 ext4_rsv_window_add(sb, &sbi->s_rsv_window_head);
ac27a0ec 2295
c9de560d
AT		 2296 sbi->s_stripe = ext4_get_stripe_size(sbi);
2297
ac27a0ec
DK		 2298 /*
2299 * set up enough so that it can read an inode
2300 */
617ba13b
MC		 2301 sb->s_op = &ext4_sops;
2302 sb->s_export_op = &ext4_export_ops;
2303 sb->s_xattr = ext4_xattr_handlers;
ac27a0ec 2304#ifdef CONFIG_QUOTA
617ba13b
MC		 2305 sb->s_qcop = &ext4_qctl_operations;
2306 sb->dq_op = &ext4_quota_operations;
ac27a0ec
DK		 2307#endif
2308 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
2309
2310 sb->s_root = NULL;
2311
2312 needs_recovery = (es->s_last_orphan != 0 ||
617ba13b
MC		 2313 EXT4_HAS_INCOMPAT_FEATURE(sb,
2314 EXT4_FEATURE_INCOMPAT_RECOVER));
ac27a0ec
DK		 2315
2316 /*
2317 * The first inode we look at is the journal inode. Don't try
2318 * root first: it may be modified in the journal!
2319 */
2320 if (!test_opt(sb, NOLOAD) &&
617ba13b
MC		 2321 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
2322 if (ext4_load_journal(sb, es, journal_devnum))
ac27a0ec 2323 goto failed_mount3;
624080ed
TT		 2324 if (!(sb->s_flags & MS_RDONLY) &&
2325 EXT4_SB(sb)->s_journal->j_failed_commit) {
2326 printk(KERN_CRIT "EXT4-fs error (device %s): "
2327 "ext4_fill_super: Journal transaction "
2b2d6d01 2328 "%u is corrupt\n", sb->s_id,
624080ed 2329 EXT4_SB(sb)->s_journal->j_failed_commit);
2b2d6d01
TT		 2330 if (test_opt(sb, ERRORS_RO)) {
2331 printk(KERN_CRIT
2332 "Mounting filesystem read-only\n");
624080ed
TT		 2333 sb->s_flags |= MS_RDONLY;
2334 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
2335 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
2336 }
2337 if (test_opt(sb, ERRORS_PANIC)) {
2338 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
2339 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
2340 ext4_commit_super(sb, es, 1);
2341 printk(KERN_CRIT
2342 "EXT4-fs (device %s): mount failed\n",
2343 sb->s_id);
2344 goto failed_mount4;
2345 }
2346 }
ac27a0ec 2347 } else if (journal_inum) {
617ba13b 2348 if (ext4_create_journal(sb, es, journal_inum))
ac27a0ec
DK		 2349 goto failed_mount3;
2350 } else {
2351 if (!silent)
2b2d6d01
TT		 2352 printk(KERN_ERR
2353 "ext4: No journal on filesystem on %s\n",
2354 sb->s_id);
ac27a0ec
DK		 2355 goto failed_mount3;
2356 }
2357
eb40a09c
JS		 2358 if (ext4_blocks_count(es) > 0xffffffffULL &&
2359 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
2360 JBD2_FEATURE_INCOMPAT_64BIT)) {
2361 printk(KERN_ERR "ext4: Failed to set 64-bit journal feature\n");
2362 goto failed_mount4;
2363 }
2364
818d276c
GS		 2365 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
2366 jbd2_journal_set_features(sbi->s_journal,
2367 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
2368 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2369 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
2370 jbd2_journal_set_features(sbi->s_journal,
2371 JBD2_FEATURE_COMPAT_CHECKSUM, 0, 0);
2372 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
2373 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2374 } else {
2375 jbd2_journal_clear_features(sbi->s_journal,
2376 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
2377 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2378 }
2379
ac27a0ec
DK		 2380 /* We have now updated the journal if required, so we can
2381 * validate the data journaling mode. */
2382 switch (test_opt(sb, DATA_FLAGS)) {
2383 case 0:
2384 /* No mode set, assume a default based on the journal
63f57933
AM		 2385 * capabilities: ORDERED_DATA if the journal can
2386 * cope, else JOURNAL_DATA
2387 */
dab291af
MC		 2388 if (jbd2_journal_check_available_features
2389 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
ac27a0ec
DK		 2390 set_opt(sbi->s_mount_opt, ORDERED_DATA);
2391 else
2392 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
2393 break;
2394
617ba13b
MC		 2395 case EXT4_MOUNT_ORDERED_DATA:
2396 case EXT4_MOUNT_WRITEBACK_DATA:
dab291af
MC		 2397 if (!jbd2_journal_check_available_features
2398 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
617ba13b 2399 printk(KERN_ERR "EXT4-fs: Journal does not support "
ac27a0ec
DK		 2400 "requested data journaling mode\n");
2401 goto failed_mount4;
2402 }
2403 default:
2404 break;
2405 }
2406
2407 if (test_opt(sb, NOBH)) {
617ba13b
MC		 2408 if (!(test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)) {
2409 printk(KERN_WARNING "EXT4-fs: Ignoring nobh option - "
ac27a0ec
DK		 2410 "its supported only with writeback mode\n");
2411 clear_opt(sbi->s_mount_opt, NOBH);
2412 }
2413 }
2414 /*
dab291af 2415 * The jbd2_journal_load will have done any necessary log recovery,
ac27a0ec
DK		 2416 * so we can safely mount the rest of the filesystem now.
2417 */
2418
1d1fe1ee
DH		 2419 root = ext4_iget(sb, EXT4_ROOT_INO);
2420 if (IS_ERR(root)) {
617ba13b 2421 printk(KERN_ERR "EXT4-fs: get root inode failed\n");
1d1fe1ee 2422 ret = PTR_ERR(root);
ac27a0ec
DK		 2423 goto failed_mount4;
2424 }
2425 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1d1fe1ee 2426 iput(root);
617ba13b 2427 printk(KERN_ERR "EXT4-fs: corrupt root inode, run e2fsck\n");
ac27a0ec
DK		 2428 goto failed_mount4;
2429 }
1d1fe1ee
DH		 2430 sb->s_root = d_alloc_root(root);
2431 if (!sb->s_root) {
2432 printk(KERN_ERR "EXT4-fs: get root dentry failed\n");
2433 iput(root);
2434 ret = -ENOMEM;
2435 goto failed_mount4;
2436 }
ac27a0ec 2437
2b2d6d01 2438 ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY);
ef7f3835
KS		 2439
2440 /* determine the minimum size of new large inodes, if present */
2441 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
2442 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
2443 EXT4_GOOD_OLD_INODE_SIZE;
2444 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
2445 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) {
2446 if (sbi->s_want_extra_isize <
2447 le16_to_cpu(es->s_want_extra_isize))
2448 sbi->s_want_extra_isize =
2449 le16_to_cpu(es->s_want_extra_isize);
2450 if (sbi->s_want_extra_isize <
2451 le16_to_cpu(es->s_min_extra_isize))
2452 sbi->s_want_extra_isize =
2453 le16_to_cpu(es->s_min_extra_isize);
2454 }
2455 }
2456 /* Check if enough inode space is available */
2457 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
2458 sbi->s_inode_size) {
2459 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
2460 EXT4_GOOD_OLD_INODE_SIZE;
2461 printk(KERN_INFO "EXT4-fs: required extra inode space not"
2462 "available.\n");
2463 }
2464
ac27a0ec
DK		 2465 /*
2466 * akpm: core read_super() calls in here with the superblock locked.
2467 * That deadlocks, because orphan cleanup needs to lock the superblock
2468 * in numerous places. Here we just pop the lock - it's relatively
2469 * harmless, because we are now ready to accept write_super() requests,
2470 * and aviro says that's the only reason for hanging onto the
2471 * superblock lock.
2472 */
617ba13b
MC		 2473 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
2474 ext4_orphan_cleanup(sb, es);
2475 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
ac27a0ec 2476 if (needs_recovery)
2b2d6d01 2477 printk(KERN_INFO "EXT4-fs: recovery complete.\n");
617ba13b 2478 ext4_mark_recovery_complete(sb, es);
2b2d6d01
TT		 2479 printk(KERN_INFO "EXT4-fs: mounted filesystem with %s data mode.\n",
2480 test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA ? "journal":
2481 test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA ? "ordered":
2482 "writeback");
ac27a0ec 2483
dd919b98
AK		 2484 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
2485 printk(KERN_WARNING "EXT4-fs: Ignoring delalloc option - "
2486 "requested data journaling mode\n");
2487 clear_opt(sbi->s_mount_opt, DELALLOC);
2488 } else if (test_opt(sb, DELALLOC))
2489 printk(KERN_INFO "EXT4-fs: delayed allocation enabled\n");
2490
a86c6181 2491 ext4_ext_init(sb);
c9de560d 2492 ext4_mb_init(sb, needs_recovery);
a86c6181 2493
ac27a0ec
DK		 2494 lock_kernel();
2495 return 0;
2496
617ba13b 2497cantfind_ext4:
ac27a0ec 2498 if (!silent)
617ba13b 2499 printk(KERN_ERR "VFS: Can't find ext4 filesystem on dev %s.\n",
ac27a0ec
DK		 2500 sb->s_id);
2501 goto failed_mount;
2502
2503failed_mount4:
dab291af 2504 jbd2_journal_destroy(sbi->s_journal);
47b4a50b 2505 sbi->s_journal = NULL;
ac27a0ec
DK		 2506failed_mount3:
2507 percpu_counter_destroy(&sbi->s_freeblocks_counter);
2508 percpu_counter_destroy(&sbi->s_freeinodes_counter);
2509 percpu_counter_destroy(&sbi->s_dirs_counter);
6bc6e63f 2510 percpu_counter_destroy(&sbi->s_dirtyblocks_counter);
ac27a0ec
DK		 2511failed_mount2:
2512 for (i = 0; i < db_count; i++)
2513 brelse(sbi->s_group_desc[i]);
2514 kfree(sbi->s_group_desc);
2515failed_mount:
9f6200bb
TT		 2516 if (sbi->s_proc)
2517 remove_proc_entry(sb->s_id, ext4_proc_root);
ac27a0ec
DK		 2518#ifdef CONFIG_QUOTA
2519 for (i = 0; i < MAXQUOTAS; i++)
2520 kfree(sbi->s_qf_names[i]);
2521#endif
617ba13b 2522 ext4_blkdev_remove(sbi);
ac27a0ec
DK		 2523 brelse(bh);
2524out_fail:
2525 sb->s_fs_info = NULL;
2526 kfree(sbi);
2527 lock_kernel();
1d1fe1ee 2528 return ret;
ac27a0ec
DK		 2529}
2530
2531/*
2532 * Setup any per-fs journal parameters now. We'll do this both on
2533 * initial mount, once the journal has been initialised but before we've
2534 * done any recovery; and again on any subsequent remount.
2535 */
617ba13b 2536static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
ac27a0ec 2537{
617ba13b 2538 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec
DK		 2539
2540 if (sbi->s_commit_interval)
2541 journal->j_commit_interval = sbi->s_commit_interval;
617ba13b 2542 /* We could also set up an ext4-specific default for the commit
ac27a0ec
DK		 2543 * interval here, but for now we'll just fall back to the jbd
2544 * default. */
2545
2546 spin_lock(&journal->j_state_lock);
2547 if (test_opt(sb, BARRIER))
dab291af 2548 journal->j_flags |= JBD2_BARRIER;
ac27a0ec 2549 else
dab291af 2550 journal->j_flags &= ~JBD2_BARRIER;
ac27a0ec
DK		 2551 spin_unlock(&journal->j_state_lock);
2552}
2553
617ba13b 2554static journal_t *ext4_get_journal(struct super_block *sb,
ac27a0ec
DK		 2555 unsigned int journal_inum)
2556{
2557 struct inode *journal_inode;
2558 journal_t *journal;
2559
2560 /* First, test for the existence of a valid inode on disk. Bad
2561 * things happen if we iget() an unused inode, as the subsequent
2562 * iput() will try to delete it. */
2563
1d1fe1ee
DH		 2564 journal_inode = ext4_iget(sb, journal_inum);
2565 if (IS_ERR(journal_inode)) {
617ba13b 2566 printk(KERN_ERR "EXT4-fs: no journal found.\n");
ac27a0ec
DK		 2567 return NULL;
2568 }
2569 if (!journal_inode->i_nlink) {
2570 make_bad_inode(journal_inode);
2571 iput(journal_inode);
617ba13b 2572 printk(KERN_ERR "EXT4-fs: journal inode is deleted.\n");
ac27a0ec
DK		 2573 return NULL;
2574 }
2575
e5f8eab8 2576 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
ac27a0ec 2577 journal_inode, journal_inode->i_size);
1d1fe1ee 2578 if (!S_ISREG(journal_inode->i_mode)) {
617ba13b 2579 printk(KERN_ERR "EXT4-fs: invalid journal inode.\n");
ac27a0ec
DK		 2580 iput(journal_inode);
2581 return NULL;
2582 }
2583
dab291af 2584 journal = jbd2_journal_init_inode(journal_inode);
ac27a0ec 2585 if (!journal) {
617ba13b 2586 printk(KERN_ERR "EXT4-fs: Could not load journal inode\n");
ac27a0ec
DK		 2587 iput(journal_inode);
2588 return NULL;
2589 }
2590 journal->j_private = sb;
617ba13b 2591 ext4_init_journal_params(sb, journal);
ac27a0ec
DK		 2592 return journal;
2593}
2594
617ba13b 2595static journal_t *ext4_get_dev_journal(struct super_block *sb,
ac27a0ec
DK		 2596 dev_t j_dev)
2597{
2b2d6d01 2598 struct buffer_head *bh;
ac27a0ec 2599 journal_t *journal;
617ba13b
MC		 2600 ext4_fsblk_t start;
2601 ext4_fsblk_t len;
ac27a0ec 2602 int hblock, blocksize;
617ba13b 2603 ext4_fsblk_t sb_block;
ac27a0ec 2604 unsigned long offset;
2b2d6d01 2605 struct ext4_super_block *es;
ac27a0ec
DK		 2606 struct block_device *bdev;
2607
617ba13b 2608 bdev = ext4_blkdev_get(j_dev);
ac27a0ec
DK		 2609 if (bdev == NULL)
2610 return NULL;
2611
2612 if (bd_claim(bdev, sb)) {
2613 printk(KERN_ERR
8c55e204 2614 "EXT4: failed to claim external journal device.\n");
ac27a0ec
DK		 2615 blkdev_put(bdev);
2616 return NULL;
2617 }
2618
2619 blocksize = sb->s_blocksize;
2620 hblock = bdev_hardsect_size(bdev);
2621 if (blocksize < hblock) {
2622 printk(KERN_ERR
617ba13b 2623 "EXT4-fs: blocksize too small for journal device.\n");
ac27a0ec
DK		 2624 goto out_bdev;
2625 }
2626
617ba13b
MC		 2627 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
2628 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
ac27a0ec
DK		 2629 set_blocksize(bdev, blocksize);
2630 if (!(bh = __bread(bdev, sb_block, blocksize))) {
617ba13b 2631 printk(KERN_ERR "EXT4-fs: couldn't read superblock of "
ac27a0ec
DK		 2632 "external journal\n");
2633 goto out_bdev;
2634 }
2635
617ba13b
MC		 2636 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
2637 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
ac27a0ec 2638 !(le32_to_cpu(es->s_feature_incompat) &
617ba13b
MC		 2639 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
2640 printk(KERN_ERR "EXT4-fs: external journal has "
ac27a0ec
DK		 2641 "bad superblock\n");
2642 brelse(bh);
2643 goto out_bdev;
2644 }
2645
617ba13b
MC		 2646 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
2647 printk(KERN_ERR "EXT4-fs: journal UUID does not match\n");
ac27a0ec
DK		 2648 brelse(bh);
2649 goto out_bdev;
2650 }
2651
bd81d8ee 2652 len = ext4_blocks_count(es);
ac27a0ec
DK		 2653 start = sb_block + 1;
2654 brelse(bh); /* we're done with the superblock */
2655
dab291af 2656 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
ac27a0ec
DK		 2657 start, len, blocksize);
2658 if (!journal) {
617ba13b 2659 printk(KERN_ERR "EXT4-fs: failed to create device journal\n");
ac27a0ec
DK		 2660 goto out_bdev;
2661 }
2662 journal->j_private = sb;
2663 ll_rw_block(READ, 1, &journal->j_sb_buffer);
2664 wait_on_buffer(journal->j_sb_buffer);
2665 if (!buffer_uptodate(journal->j_sb_buffer)) {
617ba13b 2666 printk(KERN_ERR "EXT4-fs: I/O error on journal device\n");
ac27a0ec
DK		 2667 goto out_journal;
2668 }
2669 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
617ba13b 2670 printk(KERN_ERR "EXT4-fs: External journal has more than one "
ac27a0ec
DK		 2671 "user (unsupported) - %d\n",
2672 be32_to_cpu(journal->j_superblock->s_nr_users));
2673 goto out_journal;
2674 }
617ba13b
MC		 2675 EXT4_SB(sb)->journal_bdev = bdev;
2676 ext4_init_journal_params(sb, journal);
ac27a0ec
DK		 2677 return journal;
2678out_journal:
dab291af 2679 jbd2_journal_destroy(journal);
ac27a0ec 2680out_bdev:
617ba13b 2681 ext4_blkdev_put(bdev);
ac27a0ec
DK		 2682 return NULL;
2683}
2684
617ba13b
MC		 2685static int ext4_load_journal(struct super_block *sb,
2686 struct ext4_super_block *es,
ac27a0ec
DK		 2687 unsigned long journal_devnum)
2688{
2689 journal_t *journal;
2690 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
2691 dev_t journal_dev;
2692 int err = 0;
2693 int really_read_only;
2694
2695 if (journal_devnum &&
2696 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
617ba13b 2697 printk(KERN_INFO "EXT4-fs: external journal device major/minor "
ac27a0ec
DK		 2698 "numbers have changed\n");
2699 journal_dev = new_decode_dev(journal_devnum);
2700 } else
2701 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
2702
2703 really_read_only = bdev_read_only(sb->s_bdev);
2704
2705 /*
2706 * Are we loading a blank journal or performing recovery after a
2707 * crash? For recovery, we need to check in advance whether we
2708 * can get read-write access to the device.
2709 */
2710
617ba13b 2711 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
ac27a0ec 2712 if (sb->s_flags & MS_RDONLY) {
617ba13b 2713 printk(KERN_INFO "EXT4-fs: INFO: recovery "
ac27a0ec
DK		 2714 "required on readonly filesystem.\n");
2715 if (really_read_only) {
617ba13b 2716 printk(KERN_ERR "EXT4-fs: write access "
ac27a0ec
DK		 2717 "unavailable, cannot proceed.\n");
2718 return -EROFS;
2719 }
2b2d6d01
TT		 2720 printk(KERN_INFO "EXT4-fs: write access will "
2721 "be enabled during recovery.\n");
ac27a0ec
DK		 2722 }
2723 }
2724
2725 if (journal_inum && journal_dev) {
617ba13b 2726 printk(KERN_ERR "EXT4-fs: filesystem has both journal "
ac27a0ec
DK		 2727 "and inode journals!\n");
2728 return -EINVAL;
2729 }
2730
2731 if (journal_inum) {
617ba13b 2732 if (!(journal = ext4_get_journal(sb, journal_inum)))
ac27a0ec
DK		 2733 return -EINVAL;
2734 } else {
617ba13b 2735 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
ac27a0ec
DK		 2736 return -EINVAL;
2737 }
2738
4776004f
TT		 2739 if (journal->j_flags & JBD2_BARRIER)
2740 printk(KERN_INFO "EXT4-fs: barriers enabled\n");
2741 else
2742 printk(KERN_INFO "EXT4-fs: barriers disabled\n");
2743
ac27a0ec 2744 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
dab291af 2745 err = jbd2_journal_update_format(journal);
ac27a0ec 2746 if (err) {
617ba13b 2747 printk(KERN_ERR "EXT4-fs: error updating journal.\n");
dab291af 2748 jbd2_journal_destroy(journal);
ac27a0ec
DK		 2749 return err;
2750 }
2751 }
2752
617ba13b 2753 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
dab291af 2754 err = jbd2_journal_wipe(journal, !really_read_only);
ac27a0ec 2755 if (!err)
dab291af 2756 err = jbd2_journal_load(journal);
ac27a0ec
DK		 2757
2758 if (err) {
617ba13b 2759 printk(KERN_ERR "EXT4-fs: error loading journal.\n");
dab291af 2760 jbd2_journal_destroy(journal);
ac27a0ec
DK		 2761 return err;
2762 }
2763
617ba13b
MC		 2764 EXT4_SB(sb)->s_journal = journal;
2765 ext4_clear_journal_err(sb, es);
ac27a0ec
DK		 2766
2767 if (journal_devnum &&
2768 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
2769 es->s_journal_dev = cpu_to_le32(journal_devnum);
2770 sb->s_dirt = 1;
2771
2772 /* Make sure we flush the recovery flag to disk. */
617ba13b 2773 ext4_commit_super(sb, es, 1);
ac27a0ec
DK		 2774 }
2775
2776 return 0;
2777}
2778
2b2d6d01
TT		 2779static int ext4_create_journal(struct super_block *sb,
2780 struct ext4_super_block *es,
ac27a0ec
DK		 2781 unsigned int journal_inum)
2782{
2783 journal_t *journal;
6c675bd4 2784 int err;
ac27a0ec
DK		 2785
2786 if (sb->s_flags & MS_RDONLY) {
617ba13b 2787 printk(KERN_ERR "EXT4-fs: readonly filesystem when trying to "
ac27a0ec
DK		 2788 "create journal.\n");
2789 return -EROFS;
2790 }
2791
6c675bd4
BP		 2792 journal = ext4_get_journal(sb, journal_inum);
2793 if (!journal)
ac27a0ec
DK		 2794 return -EINVAL;
2795
617ba13b 2796 printk(KERN_INFO "EXT4-fs: creating new journal on inode %u\n",
ac27a0ec
DK		 2797 journal_inum);
2798
6c675bd4
BP		 2799 err = jbd2_journal_create(journal);
2800 if (err) {
617ba13b 2801 printk(KERN_ERR "EXT4-fs: error creating journal.\n");
dab291af 2802 jbd2_journal_destroy(journal);
ac27a0ec
DK		 2803 return -EIO;
2804 }
2805
617ba13b 2806 EXT4_SB(sb)->s_journal = journal;
ac27a0ec 2807
617ba13b
MC		 2808 ext4_update_dynamic_rev(sb);
2809 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2810 EXT4_SET_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL);
ac27a0ec
DK		 2811
2812 es->s_journal_inum = cpu_to_le32(journal_inum);
2813 sb->s_dirt = 1;
2814
2815 /* Make sure we flush the recovery flag to disk. */
617ba13b 2816 ext4_commit_super(sb, es, 1);
ac27a0ec
DK		 2817
2818 return 0;
2819}
2820
2b2d6d01
TT		 2821static void ext4_commit_super(struct super_block *sb,
2822 struct ext4_super_block *es, int sync)
ac27a0ec 2823{
617ba13b 2824 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
ac27a0ec
DK		 2825
2826 if (!sbh)
2827 return;
914258bf
TT		 2828 if (buffer_write_io_error(sbh)) {
2829 /*
2830 * Oh, dear. A previous attempt to write the
2831 * superblock failed. This could happen because the
2832 * USB device was yanked out. Or it could happen to
2833 * be a transient write error and maybe the block will
2834 * be remapped. Nothing we can do but to retry the
2835 * write and hope for the best.
2836 */
2837 printk(KERN_ERR "ext4: previous I/O error to "
2838 "superblock detected for %s.\n", sb->s_id);
2839 clear_buffer_write_io_error(sbh);
2840 set_buffer_uptodate(sbh);
2841 }
ac27a0ec 2842 es->s_wtime = cpu_to_le32(get_seconds());
bd81d8ee 2843 ext4_free_blocks_count_set(es, ext4_count_free_blocks(sb));
617ba13b 2844 es->s_free_inodes_count = cpu_to_le32(ext4_count_free_inodes(sb));
ac27a0ec
DK		 2845 BUFFER_TRACE(sbh, "marking dirty");
2846 mark_buffer_dirty(sbh);
914258bf 2847 if (sync) {
ac27a0ec 2848 sync_dirty_buffer(sbh);
914258bf
TT		 2849 if (buffer_write_io_error(sbh)) {
2850 printk(KERN_ERR "ext4: I/O error while writing "
2851 "superblock for %s.\n", sb->s_id);
2852 clear_buffer_write_io_error(sbh);
2853 set_buffer_uptodate(sbh);
2854 }
2855 }
ac27a0ec
DK		 2856}
2857
2858
2859/*
2860 * Have we just finished recovery? If so, and if we are mounting (or
2861 * remounting) the filesystem readonly, then we will end up with a
2862 * consistent fs on disk. Record that fact.
2863 */
2b2d6d01
TT		 2864static void ext4_mark_recovery_complete(struct super_block *sb,
2865 struct ext4_super_block *es)
ac27a0ec 2866{
617ba13b 2867 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 2868
dab291af
MC		 2869 jbd2_journal_lock_updates(journal);
2870 jbd2_journal_flush(journal);
32c37730 2871 lock_super(sb);
617ba13b 2872 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
ac27a0ec 2873 sb->s_flags & MS_RDONLY) {
617ba13b 2874 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
ac27a0ec 2875 sb->s_dirt = 0;
617ba13b 2876 ext4_commit_super(sb, es, 1);
ac27a0ec 2877 }
32c37730 2878 unlock_super(sb);
dab291af 2879 jbd2_journal_unlock_updates(journal);
ac27a0ec
DK		 2880}
2881
2882/*
2883 * If we are mounting (or read-write remounting) a filesystem whose journal
2884 * has recorded an error from a previous lifetime, move that error to the
2885 * main filesystem now.
2886 */
2b2d6d01
TT		 2887static void ext4_clear_journal_err(struct super_block *sb,
2888 struct ext4_super_block *es)
ac27a0ec
DK		 2889{
2890 journal_t *journal;
2891 int j_errno;
2892 const char *errstr;
2893
617ba13b 2894 journal = EXT4_SB(sb)->s_journal;
ac27a0ec
DK		 2895
2896 /*
2897 * Now check for any error status which may have been recorded in the
617ba13b 2898 * journal by a prior ext4_error() or ext4_abort()
ac27a0ec
DK		 2899 */
2900
dab291af 2901 j_errno = jbd2_journal_errno(journal);
ac27a0ec
DK		 2902 if (j_errno) {
2903 char nbuf[16];
2904
617ba13b 2905 errstr = ext4_decode_error(sb, j_errno, nbuf);
46e665e9 2906 ext4_warning(sb, __func__, "Filesystem error recorded "
ac27a0ec 2907 "from previous mount: %s", errstr);
46e665e9 2908 ext4_warning(sb, __func__, "Marking fs in need of "
ac27a0ec
DK		 2909 "filesystem check.");
2910
617ba13b
MC		 2911 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
2912 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
2b2d6d01 2913 ext4_commit_super(sb, es, 1);
ac27a0ec 2914
dab291af 2915 jbd2_journal_clear_err(journal);
ac27a0ec
DK		 2916 }
2917}
2918
2919/*
2920 * Force the running and committing transactions to commit,
2921 * and wait on the commit.
2922 */
617ba13b 2923int ext4_force_commit(struct super_block *sb)
ac27a0ec
DK		 2924{
2925 journal_t *journal;
2926 int ret;
2927
2928 if (sb->s_flags & MS_RDONLY)
2929 return 0;
2930
617ba13b 2931 journal = EXT4_SB(sb)->s_journal;
ac27a0ec 2932 sb->s_dirt = 0;
617ba13b 2933 ret = ext4_journal_force_commit(journal);
ac27a0ec
DK		 2934 return ret;
2935}
2936
2937/*
617ba13b 2938 * Ext4 always journals updates to the superblock itself, so we don't
ac27a0ec
DK		 2939 * have to propagate any other updates to the superblock on disk at this
2940 * point. Just start an async writeback to get the buffers on their way
2941 * to the disk.
2942 *
2943 * This implicitly triggers the writebehind on sync().
2944 */
2945
2b2d6d01 2946static void ext4_write_super(struct super_block *sb)
ac27a0ec
DK		 2947{
2948 if (mutex_trylock(&sb->s_lock) != 0)
2949 BUG();
2950 sb->s_dirt = 0;
2951}
2952
617ba13b 2953static int ext4_sync_fs(struct super_block *sb, int wait)
ac27a0ec
DK		 2954{
2955 tid_t target;
2956
2957 sb->s_dirt = 0;
dab291af 2958 if (jbd2_journal_start_commit(EXT4_SB(sb)->s_journal, &target)) {
ac27a0ec 2959 if (wait)
dab291af 2960 jbd2_log_wait_commit(EXT4_SB(sb)->s_journal, target);
ac27a0ec
DK		 2961 }
2962 return 0;
2963}
2964
2965/*
2966 * LVM calls this function before a (read-only) snapshot is created. This
2967 * gives us a chance to flush the journal completely and mark the fs clean.
2968 */
617ba13b 2969static void ext4_write_super_lockfs(struct super_block *sb)
ac27a0ec
DK		 2970{
2971 sb->s_dirt = 0;
2972
2973 if (!(sb->s_flags & MS_RDONLY)) {
617ba13b 2974 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec
DK		 2975
2976 /* Now we set up the journal barrier. */
dab291af
MC		 2977 jbd2_journal_lock_updates(journal);
2978 jbd2_journal_flush(journal);
ac27a0ec
DK		 2979
2980 /* Journal blocked and flushed, clear needs_recovery flag. */
617ba13b
MC		 2981 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2982 ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1);
ac27a0ec
DK		 2983 }
2984}
2985
2986/*
2987 * Called by LVM after the snapshot is done. We need to reset the RECOVER
2988 * flag here, even though the filesystem is not technically dirty yet.
2989 */
617ba13b 2990static void ext4_unlockfs(struct super_block *sb)
ac27a0ec
DK		 2991{
2992 if (!(sb->s_flags & MS_RDONLY)) {
2993 lock_super(sb);
2994 /* Reser the needs_recovery flag before the fs is unlocked. */
617ba13b
MC		 2995 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
2996 ext4_commit_super(sb, EXT4_SB(sb)->s_es, 1);
ac27a0ec 2997 unlock_super(sb);
dab291af 2998 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
ac27a0ec
DK		 2999 }
3000}
3001
2b2d6d01 3002static int ext4_remount(struct super_block *sb, int *flags, char *data)
ac27a0ec 3003{
2b2d6d01 3004 struct ext4_super_block *es;
617ba13b
MC		 3005 struct ext4_sb_info *sbi = EXT4_SB(sb);
3006 ext4_fsblk_t n_blocks_count = 0;
ac27a0ec 3007 unsigned long old_sb_flags;
617ba13b 3008 struct ext4_mount_options old_opts;
8a266467 3009 ext4_group_t g;
ac27a0ec
DK		 3010 int err;
3011#ifdef CONFIG_QUOTA
3012 int i;
3013#endif
3014
3015 /* Store the original options */
3016 old_sb_flags = sb->s_flags;
3017 old_opts.s_mount_opt = sbi->s_mount_opt;
3018 old_opts.s_resuid = sbi->s_resuid;
3019 old_opts.s_resgid = sbi->s_resgid;
3020 old_opts.s_commit_interval = sbi->s_commit_interval;
3021#ifdef CONFIG_QUOTA
3022 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
3023 for (i = 0; i < MAXQUOTAS; i++)
3024 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
3025#endif
3026
3027 /*
3028 * Allow the "check" option to be passed as a remount option.
3029 */
3030 if (!parse_options(data, sb, NULL, NULL, &n_blocks_count, 1)) {
3031 err = -EINVAL;
3032 goto restore_opts;
3033 }
3034
617ba13b 3035 if (sbi->s_mount_opt & EXT4_MOUNT_ABORT)
46e665e9 3036 ext4_abort(sb, __func__, "Abort forced by user");
ac27a0ec
DK		 3037
3038 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
617ba13b 3039 ((sbi->s_mount_opt & EXT4_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec
DK		 3040
3041 es = sbi->s_es;
3042
617ba13b 3043 ext4_init_journal_params(sb, sbi->s_journal);
ac27a0ec
DK		 3044
3045 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
bd81d8ee 3046 n_blocks_count > ext4_blocks_count(es)) {
617ba13b 3047 if (sbi->s_mount_opt & EXT4_MOUNT_ABORT) {
ac27a0ec
DK		 3048 err = -EROFS;
3049 goto restore_opts;
3050 }
3051
3052 if (*flags & MS_RDONLY) {
3053 /*
3054 * First of all, the unconditional stuff we have to do
3055 * to disable replay of the journal when we next remount
3056 */
3057 sb->s_flags |= MS_RDONLY;
3058
3059 /*
3060 * OK, test if we are remounting a valid rw partition
3061 * readonly, and if so set the rdonly flag and then
3062 * mark the partition as valid again.
3063 */
617ba13b
MC		 3064 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
3065 (sbi->s_mount_state & EXT4_VALID_FS))
ac27a0ec
DK		 3066 es->s_state = cpu_to_le16(sbi->s_mount_state);
3067
32c37730
JK		 3068 /*
3069 * We have to unlock super so that we can wait for
3070 * transactions.
3071 */
3072 unlock_super(sb);
617ba13b 3073 ext4_mark_recovery_complete(sb, es);
32c37730 3074 lock_super(sb);
ac27a0ec
DK		 3075 } else {
3076 __le32 ret;
617ba13b
MC		 3077 if ((ret = EXT4_HAS_RO_COMPAT_FEATURE(sb,
3078 ~EXT4_FEATURE_RO_COMPAT_SUPP))) {
3079 printk(KERN_WARNING "EXT4-fs: %s: couldn't "
ac27a0ec
DK		 3080 "remount RDWR because of unsupported "
3081 "optional features (%x).\n",
3082 sb->s_id, le32_to_cpu(ret));
3083 err = -EROFS;
3084 goto restore_opts;
3085 }
ead6596b 3086
8a266467
TT		 3087 /*
3088 * Make sure the group descriptor checksums
3089 * are sane. If they aren't, refuse to
3090 * remount r/w.
3091 */
3092 for (g = 0; g < sbi->s_groups_count; g++) {
3093 struct ext4_group_desc *gdp =
3094 ext4_get_group_desc(sb, g, NULL);
3095
3096 if (!ext4_group_desc_csum_verify(sbi, g, gdp)) {
3097 printk(KERN_ERR
3098 "EXT4-fs: ext4_remount: "
3099 "Checksum for group %lu failed (%u!=%u)\n",
3100 g, le16_to_cpu(ext4_group_desc_csum(sbi, g, gdp)),
3101 le16_to_cpu(gdp->bg_checksum));
3102 err = -EINVAL;
3103 goto restore_opts;
3104 }
3105 }
3106
ead6596b
ES		 3107 /*
3108 * If we have an unprocessed orphan list hanging
3109 * around from a previously readonly bdev mount,
3110 * require a full umount/remount for now.
3111 */
3112 if (es->s_last_orphan) {
3113 printk(KERN_WARNING "EXT4-fs: %s: couldn't "
3114 "remount RDWR because of unprocessed "
3115 "orphan inode list. Please "
3116 "umount/remount instead.\n",
3117 sb->s_id);
3118 err = -EINVAL;
3119 goto restore_opts;
3120 }
3121
ac27a0ec
DK		 3122 /*
3123 * Mounting a RDONLY partition read-write, so reread
3124 * and store the current valid flag. (It may have
3125 * been changed by e2fsck since we originally mounted
3126 * the partition.)
3127 */
617ba13b 3128 ext4_clear_journal_err(sb, es);
ac27a0ec 3129 sbi->s_mount_state = le16_to_cpu(es->s_state);
617ba13b 3130 if ((err = ext4_group_extend(sb, es, n_blocks_count)))
ac27a0ec 3131 goto restore_opts;
2b2d6d01 3132 if (!ext4_setup_super(sb, es, 0))
ac27a0ec
DK		 3133 sb->s_flags &= ~MS_RDONLY;
3134 }
3135 }
3136#ifdef CONFIG_QUOTA
3137 /* Release old quota file names */
3138 for (i = 0; i < MAXQUOTAS; i++)
3139 if (old_opts.s_qf_names[i] &&
3140 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
3141 kfree(old_opts.s_qf_names[i]);
3142#endif
3143 return 0;
3144restore_opts:
3145 sb->s_flags = old_sb_flags;
3146 sbi->s_mount_opt = old_opts.s_mount_opt;
3147 sbi->s_resuid = old_opts.s_resuid;
3148 sbi->s_resgid = old_opts.s_resgid;
3149 sbi->s_commit_interval = old_opts.s_commit_interval;
3150#ifdef CONFIG_QUOTA
3151 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
3152 for (i = 0; i < MAXQUOTAS; i++) {
3153 if (sbi->s_qf_names[i] &&
3154 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
3155 kfree(sbi->s_qf_names[i]);
3156 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
3157 }
3158#endif
3159 return err;
3160}
3161
2b2d6d01 3162static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
ac27a0ec
DK		 3163{
3164 struct super_block *sb = dentry->d_sb;
617ba13b
MC		 3165 struct ext4_sb_info *sbi = EXT4_SB(sb);
3166 struct ext4_super_block *es = sbi->s_es;
960cc398 3167 u64 fsid;
ac27a0ec 3168
5e70030d
BP		 3169 if (test_opt(sb, MINIX_DF)) {
3170 sbi->s_overhead_last = 0;
6bc9feff 3171 } else if (sbi->s_blocks_last != ext4_blocks_count(es)) {
fd2d4291 3172 ext4_group_t ngroups = sbi->s_groups_count, i;
5e70030d 3173 ext4_fsblk_t overhead = 0;
ac27a0ec
DK		 3174 smp_rmb();
3175
3176 /*
5e70030d
BP		 3177 * Compute the overhead (FS structures). This is constant
3178 * for a given filesystem unless the number of block groups
3179 * changes so we cache the previous value until it does.
ac27a0ec
DK		 3180 */
3181
3182 /*
3183 * All of the blocks before first_data_block are
3184 * overhead
3185 */
3186 overhead = le32_to_cpu(es->s_first_data_block);
3187
3188 /*
3189 * Add the overhead attributed to the superblock and
3190 * block group descriptors. If the sparse superblocks
3191 * feature is turned on, then not all groups have this.
3192 */
3193 for (i = 0; i < ngroups; i++) {
617ba13b
MC		 3194 overhead += ext4_bg_has_super(sb, i) +
3195 ext4_bg_num_gdb(sb, i);
ac27a0ec
DK		 3196 cond_resched();
3197 }
3198
3199 /*
3200 * Every block group has an inode bitmap, a block
3201 * bitmap, and an inode table.
3202 */
5e70030d
BP		 3203 overhead += ngroups * (2 + sbi->s_itb_per_group);
3204 sbi->s_overhead_last = overhead;
3205 smp_wmb();
6bc9feff 3206 sbi->s_blocks_last = ext4_blocks_count(es);
ac27a0ec
DK		 3207 }
3208
617ba13b 3209 buf->f_type = EXT4_SUPER_MAGIC;
ac27a0ec 3210 buf->f_bsize = sb->s_blocksize;
5e70030d 3211 buf->f_blocks = ext4_blocks_count(es) - sbi->s_overhead_last;
6bc6e63f
AK		 3212 buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter) -
3213 percpu_counter_sum_positive(&sbi->s_dirtyblocks_counter);
308ba3ec 3214 ext4_free_blocks_count_set(es, buf->f_bfree);
bd81d8ee
LV		 3215 buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es);
3216 if (buf->f_bfree < ext4_r_blocks_count(es))
ac27a0ec
DK		 3217 buf->f_bavail = 0;
3218 buf->f_files = le32_to_cpu(es->s_inodes_count);
52d9f3b4 3219 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
5e70030d 3220 es->s_free_inodes_count = cpu_to_le32(buf->f_ffree);
617ba13b 3221 buf->f_namelen = EXT4_NAME_LEN;
960cc398
PE		 3222 fsid = le64_to_cpup((void *)es->s_uuid) ^
3223 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
3224 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
3225 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
ac27a0ec
DK		 3226 return 0;
3227}
3228
3229/* Helper function for writing quotas on sync - we need to start transaction before quota file
3230 * is locked for write. Otherwise the are possible deadlocks:
3231 * Process 1 Process 2
617ba13b 3232 * ext4_create() quota_sync()
dab291af 3233 * jbd2_journal_start() write_dquot()
ac27a0ec 3234 * DQUOT_INIT() down(dqio_mutex)
dab291af 3235 * down(dqio_mutex) jbd2_journal_start()
ac27a0ec
DK		 3236 *
3237 */
3238
3239#ifdef CONFIG_QUOTA
3240
3241static inline struct inode *dquot_to_inode(struct dquot *dquot)
3242{
3243 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
3244}
3245
617ba13b 3246static int ext4_dquot_initialize(struct inode *inode, int type)
ac27a0ec
DK		 3247{
3248 handle_t *handle;
3249 int ret, err;
3250
3251 /* We may create quota structure so we need to reserve enough blocks */
617ba13b 3252 handle = ext4_journal_start(inode, 2*EXT4_QUOTA_INIT_BLOCKS(inode->i_sb));
ac27a0ec
DK		 3253 if (IS_ERR(handle))
3254 return PTR_ERR(handle);
3255 ret = dquot_initialize(inode, type);
617ba13b 3256 err = ext4_journal_stop(handle);
ac27a0ec
DK		 3257 if (!ret)
3258 ret = err;
3259 return ret;
3260}
3261
617ba13b 3262static int ext4_dquot_drop(struct inode *inode)
ac27a0ec
DK		 3263{
3264 handle_t *handle;
3265 int ret, err;
3266
3267 /* We may delete quota structure so we need to reserve enough blocks */
617ba13b 3268 handle = ext4_journal_start(inode, 2*EXT4_QUOTA_DEL_BLOCKS(inode->i_sb));
2887df13
JK		 3269 if (IS_ERR(handle)) {
3270 /*
3271 * We call dquot_drop() anyway to at least release references
3272 * to quota structures so that umount does not hang.
3273 */
3274 dquot_drop(inode);
ac27a0ec 3275 return PTR_ERR(handle);
2887df13 3276 }
ac27a0ec 3277 ret = dquot_drop(inode);
617ba13b 3278 err = ext4_journal_stop(handle);
ac27a0ec
DK		 3279 if (!ret)
3280 ret = err;
3281 return ret;
3282}
3283
617ba13b 3284static int ext4_write_dquot(struct dquot *dquot)
ac27a0ec
DK		 3285{
3286 int ret, err;
3287 handle_t *handle;
3288 struct inode *inode;
3289
3290 inode = dquot_to_inode(dquot);
617ba13b
MC		 3291 handle = ext4_journal_start(inode,
3292 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 3293 if (IS_ERR(handle))
3294 return PTR_ERR(handle);
3295 ret = dquot_commit(dquot);
617ba13b 3296 err = ext4_journal_stop(handle);
ac27a0ec
DK		 3297 if (!ret)
3298 ret = err;
3299 return ret;
3300}
3301
617ba13b 3302static int ext4_acquire_dquot(struct dquot *dquot)
ac27a0ec
DK		 3303{
3304 int ret, err;
3305 handle_t *handle;
3306
617ba13b
MC		 3307 handle = ext4_journal_start(dquot_to_inode(dquot),
3308 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 3309 if (IS_ERR(handle))
3310 return PTR_ERR(handle);
3311 ret = dquot_acquire(dquot);
617ba13b 3312 err = ext4_journal_stop(handle);
ac27a0ec
DK		 3313 if (!ret)
3314 ret = err;
3315 return ret;
3316}
3317
617ba13b 3318static int ext4_release_dquot(struct dquot *dquot)
ac27a0ec
DK		 3319{
3320 int ret, err;
3321 handle_t *handle;
3322
617ba13b
MC		 3323 handle = ext4_journal_start(dquot_to_inode(dquot),
3324 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
9c3013e9
JK		 3325 if (IS_ERR(handle)) {
3326 /* Release dquot anyway to avoid endless cycle in dqput() */
3327 dquot_release(dquot);
ac27a0ec 3328 return PTR_ERR(handle);
9c3013e9 3329 }
ac27a0ec 3330 ret = dquot_release(dquot);
617ba13b 3331 err = ext4_journal_stop(handle);
ac27a0ec
DK		 3332 if (!ret)
3333 ret = err;
3334 return ret;
3335}
3336
617ba13b 3337static int ext4_mark_dquot_dirty(struct dquot *dquot)
ac27a0ec 3338{
2c8be6b2 3339 /* Are we journaling quotas? */
617ba13b
MC		 3340 if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
3341 EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
ac27a0ec 3342 dquot_mark_dquot_dirty(dquot);
617ba13b 3343 return ext4_write_dquot(dquot);
ac27a0ec
DK		 3344 } else {
3345 return dquot_mark_dquot_dirty(dquot);
3346 }
3347}
3348
617ba13b 3349static int ext4_write_info(struct super_block *sb, int type)
ac27a0ec
DK		 3350{
3351 int ret, err;
3352 handle_t *handle;
3353
3354 /* Data block + inode block */
617ba13b 3355 handle = ext4_journal_start(sb->s_root->d_inode, 2);
ac27a0ec
DK		 3356 if (IS_ERR(handle))
3357 return PTR_ERR(handle);
3358 ret = dquot_commit_info(sb, type);
617ba13b 3359 err = ext4_journal_stop(handle);
ac27a0ec
DK		 3360 if (!ret)
3361 ret = err;
3362 return ret;
3363}
3364
3365/*
3366 * Turn on quotas during mount time - we need to find
3367 * the quota file and such...
3368 */
617ba13b 3369static int ext4_quota_on_mount(struct super_block *sb, int type)
ac27a0ec 3370{
617ba13b
MC		 3371 return vfs_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
3372 EXT4_SB(sb)->s_jquota_fmt, type);
ac27a0ec
DK		 3373}
3374
3375/*
3376 * Standard function to be called on quota_on
3377 */
617ba13b 3378static int ext4_quota_on(struct super_block *sb, int type, int format_id,
6f28e087 3379 char *path, int remount)
ac27a0ec
DK		 3380{
3381 int err;
3382 struct nameidata nd;
3383
3384 if (!test_opt(sb, QUOTA))
3385 return -EINVAL;
0623543b
JK		 3386 /* When remounting, no checks are needed and in fact, path is NULL */
3387 if (remount)
6f28e087 3388 return vfs_quota_on(sb, type, format_id, path, remount);
0623543b 3389
ac27a0ec
DK		 3390 err = path_lookup(path, LOOKUP_FOLLOW, &nd);
3391 if (err)
3392 return err;
0623543b 3393
ac27a0ec 3394 /* Quotafile not on the same filesystem? */
4ac91378 3395 if (nd.path.mnt->mnt_sb != sb) {
1d957f9b 3396 path_put(&nd.path);
ac27a0ec
DK		 3397 return -EXDEV;
3398 }
0623543b
JK		 3399 /* Journaling quota? */
3400 if (EXT4_SB(sb)->s_qf_names[type]) {
2b2d6d01 3401 /* Quotafile not in fs root? */
0623543b
JK		 3402 if (nd.path.dentry->d_parent->d_inode != sb->s_root->d_inode)
3403 printk(KERN_WARNING
3404 "EXT4-fs: Quota file not on filesystem root. "
3405 "Journaled quota will not work.\n");
2b2d6d01 3406 }
0623543b
JK		 3407
3408 /*
3409 * When we journal data on quota file, we have to flush journal to see
3410 * all updates to the file when we bypass pagecache...
3411 */
3412 if (ext4_should_journal_data(nd.path.dentry->d_inode)) {
3413 /*
3414 * We don't need to lock updates but journal_flush() could
3415 * otherwise be livelocked...
3416 */
3417 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
3418 jbd2_journal_flush(EXT4_SB(sb)->s_journal);
3419 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
3420 }
3421
77e69dac 3422 err = vfs_quota_on_path(sb, type, format_id, &nd.path);
1d957f9b 3423 path_put(&nd.path);
77e69dac 3424 return err;
ac27a0ec
DK		 3425}
3426
3427/* Read data from quotafile - avoid pagecache and such because we cannot afford
3428 * acquiring the locks... As quota files are never truncated and quota code
3429 * itself serializes the operations (and noone else should touch the files)
3430 * we don't have to be afraid of races */
617ba13b 3431static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec
DK		 3432 size_t len, loff_t off)
3433{
3434 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 3435 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 3436 int err = 0;
3437 int offset = off & (sb->s_blocksize - 1);
3438 int tocopy;
3439 size_t toread;
3440 struct buffer_head *bh;
3441 loff_t i_size = i_size_read(inode);
3442
3443 if (off > i_size)
3444 return 0;
3445 if (off+len > i_size)
3446 len = i_size-off;
3447 toread = len;
3448 while (toread > 0) {
3449 tocopy = sb->s_blocksize - offset < toread ?
3450 sb->s_blocksize - offset : toread;
617ba13b 3451 bh = ext4_bread(NULL, inode, blk, 0, &err);
ac27a0ec
DK		 3452 if (err)
3453 return err;
3454 if (!bh) /* A hole? */
3455 memset(data, 0, tocopy);
3456 else
3457 memcpy(data, bh->b_data+offset, tocopy);
3458 brelse(bh);
3459 offset = 0;
3460 toread -= tocopy;
3461 data += tocopy;
3462 blk++;
3463 }
3464 return len;
3465}
3466
3467/* Write to quotafile (we know the transaction is already started and has
3468 * enough credits) */
617ba13b 3469static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec
DK		 3470 const char *data, size_t len, loff_t off)
3471{
3472 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 3473 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 3474 int err = 0;
3475 int offset = off & (sb->s_blocksize - 1);
3476 int tocopy;
617ba13b 3477 int journal_quota = EXT4_SB(sb)->s_qf_names[type] != NULL;
ac27a0ec
DK		 3478 size_t towrite = len;
3479 struct buffer_head *bh;
3480 handle_t *handle = journal_current_handle();
3481
9c3013e9 3482 if (!handle) {
e5f8eab8 3483 printk(KERN_WARNING "EXT4-fs: Quota write (off=%llu, len=%llu)"
9c3013e9
JK		 3484 " cancelled because transaction is not started.\n",
3485 (unsigned long long)off, (unsigned long long)len);
3486 return -EIO;
3487 }
ac27a0ec
DK		 3488 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
3489 while (towrite > 0) {
3490 tocopy = sb->s_blocksize - offset < towrite ?
3491 sb->s_blocksize - offset : towrite;
617ba13b 3492 bh = ext4_bread(handle, inode, blk, 1, &err);
ac27a0ec
DK		 3493 if (!bh)
3494 goto out;
3495 if (journal_quota) {
617ba13b 3496 err = ext4_journal_get_write_access(handle, bh);
ac27a0ec
DK		 3497 if (err) {
3498 brelse(bh);
3499 goto out;
3500 }
3501 }
3502 lock_buffer(bh);
3503 memcpy(bh->b_data+offset, data, tocopy);
3504 flush_dcache_page(bh->b_page);
3505 unlock_buffer(bh);
3506 if (journal_quota)
617ba13b 3507 err = ext4_journal_dirty_metadata(handle, bh);
ac27a0ec
DK		 3508 else {
3509 /* Always do at least ordered writes for quotas */
678aaf48 3510 err = ext4_jbd2_file_inode(handle, inode);
ac27a0ec
DK		 3511 mark_buffer_dirty(bh);
3512 }
3513 brelse(bh);
3514 if (err)
3515 goto out;
3516 offset = 0;
3517 towrite -= tocopy;
3518 data += tocopy;
3519 blk++;
3520 }
3521out:
4d04e4fb
JK		 3522 if (len == towrite) {
3523 mutex_unlock(&inode->i_mutex);
ac27a0ec 3524 return err;
4d04e4fb 3525 }
ac27a0ec
DK		 3526 if (inode->i_size < off+len-towrite) {
3527 i_size_write(inode, off+len-towrite);
617ba13b 3528 EXT4_I(inode)->i_disksize = inode->i_size;
ac27a0ec 3529 }
ac27a0ec 3530 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
617ba13b 3531 ext4_mark_inode_dirty(handle, inode);
ac27a0ec
DK		 3532 mutex_unlock(&inode->i_mutex);
3533 return len - towrite;
3534}
3535
3536#endif
3537
617ba13b 3538static int ext4_get_sb(struct file_system_type *fs_type,
ac27a0ec
DK		 3539 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
3540{
617ba13b 3541 return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super, mnt);
ac27a0ec
DK		 3542}
3543
5e8814f2
TT		 3544#ifdef CONFIG_PROC_FS
3545static int ext4_ui_proc_show(struct seq_file *m, void *v)
3546{
3547 unsigned int *p = m->private;
3548
3549 seq_printf(m, "%u\n", *p);
3550 return 0;
3551}
3552
3553static int ext4_ui_proc_open(struct inode *inode, struct file *file)
3554{
3555 return single_open(file, ext4_ui_proc_show, PDE(inode)->data);
3556}
3557
3558static ssize_t ext4_ui_proc_write(struct file *file, const char __user *buf,
3559 size_t cnt, loff_t *ppos)
3560{
3561 unsigned int *p = PDE(file->f_path.dentry->d_inode)->data;
3562 char str[32];
3563 unsigned long value;
3564
3565 if (cnt >= sizeof(str))
3566 return -EINVAL;
3567 if (copy_from_user(str, buf, cnt))
3568 return -EFAULT;
3569 value = simple_strtol(str, NULL, 0);
3570 if (value < 0)
3571 return -ERANGE;
3572 *p = value;
3573 return cnt;
3574}
3575
3576const struct file_operations ext4_ui_proc_fops = {
3577 .owner = THIS_MODULE,
3578 .open = ext4_ui_proc_open,
3579 .read = seq_read,
3580 .llseek = seq_lseek,
3581 .release = single_release,
3582 .write = ext4_ui_proc_write,
3583};
3584#endif
3585
617ba13b 3586static struct file_system_type ext4dev_fs_type = {
ac27a0ec 3587 .owner = THIS_MODULE,
617ba13b
MC		 3588 .name = "ext4dev",
3589 .get_sb = ext4_get_sb,
ac27a0ec
DK		 3590 .kill_sb = kill_block_super,
3591 .fs_flags = FS_REQUIRES_DEV,
3592};
3593
617ba13b 3594static int __init init_ext4_fs(void)
ac27a0ec 3595{
c9de560d
AT		 3596 int err;
3597
9f6200bb 3598 ext4_proc_root = proc_mkdir("fs/ext4", NULL);
c9de560d 3599 err = init_ext4_mballoc();
ac27a0ec
DK		 3600 if (err)
3601 return err;
c9de560d
AT		 3602
3603 err = init_ext4_xattr();
3604 if (err)
3605 goto out2;
ac27a0ec
DK		 3606 err = init_inodecache();
3607 if (err)
3608 goto out1;
63f57933 3609 err = register_filesystem(&ext4dev_fs_type);
ac27a0ec
DK		 3610 if (err)
3611 goto out;
3612 return 0;
3613out:
3614 destroy_inodecache();
3615out1:
617ba13b 3616 exit_ext4_xattr();
c9de560d
AT		 3617out2:
3618 exit_ext4_mballoc();
ac27a0ec
DK		 3619 return err;
3620}
3621
617ba13b 3622static void __exit exit_ext4_fs(void)
ac27a0ec 3623{
617ba13b 3624 unregister_filesystem(&ext4dev_fs_type);
ac27a0ec 3625 destroy_inodecache();
617ba13b 3626 exit_ext4_xattr();
c9de560d 3627 exit_ext4_mballoc();
9f6200bb 3628 remove_proc_entry("fs/ext4", NULL);
ac27a0ec
DK		 3629}
3630
3631MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
617ba13b 3632MODULE_DESCRIPTION("Fourth Extended Filesystem with extents");
ac27a0ec 3633MODULE_LICENSE("GPL");
617ba13b
MC		 3634module_init(init_ext4_fs)
3635module_exit(exit_ext4_fs)
kernel source for telekom puls (alcatel/mediatek)