]> git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blame - fs/ext4/super.c
projects / mirror_ubuntu-artful-kernel.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
quota: explicitly set ->dq_op and ->s_qcop
[mirror_ubuntu-artful-kernel.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>
c5ca7c76 23#include <linux/vmalloc.h>
dab291af 24#include <linux/jbd2.h>
ac27a0ec
DK		 25#include <linux/slab.h>
26#include <linux/init.h>
27#include <linux/blkdev.h>
28#include <linux/parser.h>
29#include <linux/smp_lock.h>
30#include <linux/buffer_head.h>
a5694255 31#include <linux/exportfs.h>
ac27a0ec
DK		 32#include <linux/vfs.h>
33#include <linux/random.h>
34#include <linux/mount.h>
35#include <linux/namei.h>
36#include <linux/quotaops.h>
37#include <linux/seq_file.h>
9f6200bb 38#include <linux/proc_fs.h>
3197ebdb 39#include <linux/ctype.h>
1330593e 40#include <linux/log2.h>
717d50e4 41#include <linux/crc16.h>
ac27a0ec
DK		 42#include <asm/uaccess.h>
43
3dcf5451
CH		 44#include "ext4.h"
45#include "ext4_jbd2.h"
ac27a0ec
DK		 46#include "xattr.h"
47#include "acl.h"
3661d286 48#include "mballoc.h"
ac27a0ec 49
9bffad1e
TT		 50#define CREATE_TRACE_POINTS
51#include <trace/events/ext4.h>
52
9f6200bb 53struct proc_dir_entry *ext4_proc_root;
3197ebdb 54static struct kset *ext4_kset;
9f6200bb 55
617ba13b 56static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
ac27a0ec 57 unsigned long journal_devnum);
e2d67052 58static int ext4_commit_super(struct super_block *sb, int sync);
2b2d6d01
TT		 59static void ext4_mark_recovery_complete(struct super_block *sb,
60 struct ext4_super_block *es);
61static void ext4_clear_journal_err(struct super_block *sb,
62 struct ext4_super_block *es);
617ba13b 63static int ext4_sync_fs(struct super_block *sb, int wait);
2b2d6d01 64static const char *ext4_decode_error(struct super_block *sb, int errno,
ac27a0ec 65 char nbuf[16]);
2b2d6d01
TT		 66static int ext4_remount(struct super_block *sb, int *flags, char *data);
67static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
c4be0c1d 68static int ext4_unfreeze(struct super_block *sb);
2b2d6d01 69static void ext4_write_super(struct super_block *sb);
c4be0c1d 70static int ext4_freeze(struct super_block *sb);
ba69f9ab
JK		 71static int ext4_get_sb(struct file_system_type *fs_type, int flags,
72 const char *dev_name, void *data, struct vfsmount *mnt);
ac27a0ec 73
ba69f9ab
JK		 74#if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
75static struct file_system_type ext3_fs_type = {
76 .owner = THIS_MODULE,
77 .name = "ext3",
78 .get_sb = ext4_get_sb,
79 .kill_sb = kill_block_super,
80 .fs_flags = FS_REQUIRES_DEV,
81};
82#define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type)
83#else
84#define IS_EXT3_SB(sb) (0)
85#endif
bd81d8ee 86
8fadc143
AR		 87ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
88 struct ext4_group_desc *bg)
bd81d8ee 89{
3a14589c 90 return le32_to_cpu(bg->bg_block_bitmap_lo) |
8fadc143 91 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 92 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 93}
94
8fadc143
AR		 95ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
96 struct ext4_group_desc *bg)
bd81d8ee 97{
5272f837 98 return le32_to_cpu(bg->bg_inode_bitmap_lo) |
8fadc143 99 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 100 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 101}
102
8fadc143
AR		 103ext4_fsblk_t ext4_inode_table(struct super_block *sb,
104 struct ext4_group_desc *bg)
bd81d8ee 105{
5272f837 106 return le32_to_cpu(bg->bg_inode_table_lo) |
8fadc143 107 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 108 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
bd81d8ee
LV		 109}
110
560671a0
AK		 111__u32 ext4_free_blks_count(struct super_block *sb,
112 struct ext4_group_desc *bg)
113{
114 return le16_to_cpu(bg->bg_free_blocks_count_lo) |
115 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 116 (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0);
560671a0
AK		 117}
118
119__u32 ext4_free_inodes_count(struct super_block *sb,
120 struct ext4_group_desc *bg)
121{
122 return le16_to_cpu(bg->bg_free_inodes_count_lo) |
123 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 124 (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0);
560671a0
AK		 125}
126
127__u32 ext4_used_dirs_count(struct super_block *sb,
128 struct ext4_group_desc *bg)
129{
130 return le16_to_cpu(bg->bg_used_dirs_count_lo) |
131 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 132 (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0);
560671a0
AK		 133}
134
135__u32 ext4_itable_unused_count(struct super_block *sb,
136 struct ext4_group_desc *bg)
137{
138 return le16_to_cpu(bg->bg_itable_unused_lo) |
139 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 140 (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0);
560671a0
AK		 141}
142
8fadc143
AR		 143void ext4_block_bitmap_set(struct super_block *sb,
144 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 145{
3a14589c 146 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 147 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
148 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 149}
150
8fadc143
AR		 151void ext4_inode_bitmap_set(struct super_block *sb,
152 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 153{
5272f837 154 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 155 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
156 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 157}
158
8fadc143
AR		 159void ext4_inode_table_set(struct super_block *sb,
160 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 161{
5272f837 162 bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 163 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
164 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 165}
166
560671a0
AK		 167void ext4_free_blks_set(struct super_block *sb,
168 struct ext4_group_desc *bg, __u32 count)
169{
170 bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count);
171 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
172 bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16);
173}
174
175void ext4_free_inodes_set(struct super_block *sb,
176 struct ext4_group_desc *bg, __u32 count)
177{
178 bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count);
179 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
180 bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16);
181}
182
183void ext4_used_dirs_set(struct super_block *sb,
184 struct ext4_group_desc *bg, __u32 count)
185{
186 bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count);
187 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
188 bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16);
189}
190
191void ext4_itable_unused_set(struct super_block *sb,
192 struct ext4_group_desc *bg, __u32 count)
193{
194 bg->bg_itable_unused_lo = cpu_to_le16((__u16)count);
195 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
196 bg->bg_itable_unused_hi = cpu_to_le16(count >> 16);
197}
198
d3d1faf6
CW		 199
200/* Just increment the non-pointer handle value */
201static handle_t *ext4_get_nojournal(void)
202{
203 handle_t *handle = current->journal_info;
204 unsigned long ref_cnt = (unsigned long)handle;
205
206 BUG_ON(ref_cnt >= EXT4_NOJOURNAL_MAX_REF_COUNT);
207
208 ref_cnt++;
209 handle = (handle_t *)ref_cnt;
210
211 current->journal_info = handle;
212 return handle;
213}
214
215
216/* Decrement the non-pointer handle value */
217static void ext4_put_nojournal(handle_t *handle)
218{
219 unsigned long ref_cnt = (unsigned long)handle;
220
221 BUG_ON(ref_cnt == 0);
222
223 ref_cnt--;
224 handle = (handle_t *)ref_cnt;
225
226 current->journal_info = handle;
227}
228
ac27a0ec 229/*
dab291af 230 * Wrappers for jbd2_journal_start/end.
ac27a0ec
DK		 231 *
232 * The only special thing we need to do here is to make sure that all
233 * journal_end calls result in the superblock being marked dirty, so
234 * that sync() will call the filesystem's write_super callback if
235 * appropriate.
236 */
617ba13b 237handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks)
ac27a0ec
DK		 238{
239 journal_t *journal;
240
241 if (sb->s_flags & MS_RDONLY)
242 return ERR_PTR(-EROFS);
243
244 /* Special case here: if the journal has aborted behind our
245 * backs (eg. EIO in the commit thread), then we still need to
246 * take the FS itself readonly cleanly. */
617ba13b 247 journal = EXT4_SB(sb)->s_journal;
0390131b
FM		 248 if (journal) {
249 if (is_journal_aborted(journal)) {
0b8e58a1 250 ext4_abort(sb, __func__, "Detected aborted journal");
0390131b
FM		 251 return ERR_PTR(-EROFS);
252 }
253 return jbd2_journal_start(journal, nblocks);
ac27a0ec 254 }
d3d1faf6 255 return ext4_get_nojournal();
ac27a0ec
DK		 256}
257
258/*
259 * The only special thing we need to do here is to make sure that all
dab291af 260 * jbd2_journal_stop calls result in the superblock being marked dirty, so
ac27a0ec
DK		 261 * that sync() will call the filesystem's write_super callback if
262 * appropriate.
263 */
617ba13b 264int __ext4_journal_stop(const char *where, handle_t *handle)
ac27a0ec
DK		 265{
266 struct super_block *sb;
267 int err;
268 int rc;
269
0390131b 270 if (!ext4_handle_valid(handle)) {
d3d1faf6 271 ext4_put_nojournal(handle);
0390131b
FM		 272 return 0;
273 }
ac27a0ec
DK		 274 sb = handle->h_transaction->t_journal->j_private;
275 err = handle->h_err;
dab291af 276 rc = jbd2_journal_stop(handle);
ac27a0ec
DK		 277
278 if (!err)
279 err = rc;
280 if (err)
617ba13b 281 __ext4_std_error(sb, where, err);
ac27a0ec
DK		 282 return err;
283}
284
617ba13b 285void ext4_journal_abort_handle(const char *caller, const char *err_fn,
ac27a0ec
DK		 286 struct buffer_head *bh, handle_t *handle, int err)
287{
288 char nbuf[16];
617ba13b 289 const char *errstr = ext4_decode_error(NULL, err, nbuf);
ac27a0ec 290
0390131b
FM		 291 BUG_ON(!ext4_handle_valid(handle));
292
ac27a0ec
DK		 293 if (bh)
294 BUFFER_TRACE(bh, "abort");
295
296 if (!handle->h_err)
297 handle->h_err = err;
298
299 if (is_handle_aborted(handle))
300 return;
301
302 printk(KERN_ERR "%s: aborting transaction: %s in %s\n",
303 caller, errstr, err_fn);
304
dab291af 305 jbd2_journal_abort_handle(handle);
ac27a0ec
DK		 306}
307
308/* Deal with the reporting of failure conditions on a filesystem such as
309 * inconsistencies detected or read IO failures.
310 *
311 * On ext2, we can store the error state of the filesystem in the
617ba13b 312 * superblock. That is not possible on ext4, because we may have other
ac27a0ec
DK		 313 * write ordering constraints on the superblock which prevent us from
314 * writing it out straight away; and given that the journal is about to
315 * be aborted, we can't rely on the current, or future, transactions to
316 * write out the superblock safely.
317 *
dab291af 318 * We'll just use the jbd2_journal_abort() error code to record an error in
d6b198bc 319 * the journal instead. On recovery, the journal will complain about
ac27a0ec
DK		 320 * that error until we've noted it down and cleared it.
321 */
322
617ba13b 323static void ext4_handle_error(struct super_block *sb)
ac27a0ec 324{
617ba13b 325 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
ac27a0ec 326
617ba13b
MC		 327 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
328 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
ac27a0ec
DK		 329
330 if (sb->s_flags & MS_RDONLY)
331 return;
332
2b2d6d01 333 if (!test_opt(sb, ERRORS_CONT)) {
617ba13b 334 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 335
4ab2f15b 336 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
ac27a0ec 337 if (journal)
dab291af 338 jbd2_journal_abort(journal, -EIO);
ac27a0ec 339 }
2b2d6d01 340 if (test_opt(sb, ERRORS_RO)) {
b31e1552 341 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
ac27a0ec
DK		 342 sb->s_flags |= MS_RDONLY;
343 }
e2d67052 344 ext4_commit_super(sb, 1);
ac27a0ec 345 if (test_opt(sb, ERRORS_PANIC))
617ba13b 346 panic("EXT4-fs (device %s): panic forced after error\n",
ac27a0ec
DK		 347 sb->s_id);
348}
349
12062ddd 350void __ext4_error(struct super_block *sb, const char *function,
2b2d6d01 351 const char *fmt, ...)
ac27a0ec
DK		 352{
353 va_list args;
354
355 va_start(args, fmt);
2b2d6d01 356 printk(KERN_CRIT "EXT4-fs error (device %s): %s: ", sb->s_id, function);
ac27a0ec
DK		 357 vprintk(fmt, args);
358 printk("\n");
359 va_end(args);
360
617ba13b 361 ext4_handle_error(sb);
ac27a0ec
DK		 362}
363
273df556
FM		 364void ext4_error_inode(const char *function, struct inode *inode,
365 const char *fmt, ...)
366{
367 va_list args;
368
369 va_start(args, fmt);
370 printk(KERN_CRIT "EXT4-fs error (device %s): %s: inode #%lu: (comm %s) ",
371 inode->i_sb->s_id, function, inode->i_ino, current->comm);
372 vprintk(fmt, args);
373 printk("\n");
374 va_end(args);
375
376 ext4_handle_error(inode->i_sb);
377}
378
379void ext4_error_file(const char *function, struct file *file,
380 const char *fmt, ...)
381{
382 va_list args;
383 struct inode *inode = file->f_dentry->d_inode;
384 char pathname[80], *path;
385
386 va_start(args, fmt);
387 path = d_path(&(file->f_path), pathname, sizeof(pathname));
388 if (!path)
389 path = "(unknown)";
390 printk(KERN_CRIT
391 "EXT4-fs error (device %s): %s: inode #%lu (comm %s path %s): ",
392 inode->i_sb->s_id, function, inode->i_ino, current->comm, path);
393 vprintk(fmt, args);
394 printk("\n");
395 va_end(args);
396
397 ext4_handle_error(inode->i_sb);
398}
399
2b2d6d01 400static const char *ext4_decode_error(struct super_block *sb, int errno,
ac27a0ec
DK		 401 char nbuf[16])
402{
403 char *errstr = NULL;
404
405 switch (errno) {
406 case -EIO:
407 errstr = "IO failure";
408 break;
409 case -ENOMEM:
410 errstr = "Out of memory";
411 break;
412 case -EROFS:
78f1ddbb
TT		 413 if (!sb || (EXT4_SB(sb)->s_journal &&
414 EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT))
ac27a0ec
DK		 415 errstr = "Journal has aborted";
416 else
417 errstr = "Readonly filesystem";
418 break;
419 default:
420 /* If the caller passed in an extra buffer for unknown
421 * errors, textualise them now. Else we just return
422 * NULL. */
423 if (nbuf) {
424 /* Check for truncated error codes... */
425 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
426 errstr = nbuf;
427 }
428 break;
429 }
430
431 return errstr;
432}
433
617ba13b 434/* __ext4_std_error decodes expected errors from journaling functions
ac27a0ec
DK		 435 * automatically and invokes the appropriate error response. */
436
2b2d6d01 437void __ext4_std_error(struct super_block *sb, const char *function, int errno)
ac27a0ec
DK		 438{
439 char nbuf[16];
440 const char *errstr;
441
442 /* Special case: if the error is EROFS, and we're not already
443 * inside a transaction, then there's really no point in logging
444 * an error. */
445 if (errno == -EROFS && journal_current_handle() == NULL &&
446 (sb->s_flags & MS_RDONLY))
447 return;
448
617ba13b 449 errstr = ext4_decode_error(sb, errno, nbuf);
2b2d6d01
TT		 450 printk(KERN_CRIT "EXT4-fs error (device %s) in %s: %s\n",
451 sb->s_id, function, errstr);
ac27a0ec 452
617ba13b 453 ext4_handle_error(sb);
ac27a0ec
DK		 454}
455
456/*
617ba13b 457 * ext4_abort is a much stronger failure handler than ext4_error. The
ac27a0ec
DK		 458 * abort function may be used to deal with unrecoverable failures such
459 * as journal IO errors or ENOMEM at a critical moment in log management.
460 *
461 * We unconditionally force the filesystem into an ABORT|READONLY state,
462 * unless the error response on the fs has been set to panic in which
463 * case we take the easy way out and panic immediately.
464 */
465
2b2d6d01
TT		 466void ext4_abort(struct super_block *sb, const char *function,
467 const char *fmt, ...)
ac27a0ec
DK		 468{
469 va_list args;
470
ac27a0ec 471 va_start(args, fmt);
2b2d6d01 472 printk(KERN_CRIT "EXT4-fs error (device %s): %s: ", sb->s_id, function);
ac27a0ec
DK		 473 vprintk(fmt, args);
474 printk("\n");
475 va_end(args);
476
477 if (test_opt(sb, ERRORS_PANIC))
617ba13b 478 panic("EXT4-fs panic from previous error\n");
ac27a0ec
DK		 479
480 if (sb->s_flags & MS_RDONLY)
481 return;
482
b31e1552 483 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
617ba13b 484 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
ac27a0ec 485 sb->s_flags |= MS_RDONLY;
4ab2f15b 486 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
ef2cabf7
HK		 487 if (EXT4_SB(sb)->s_journal)
488 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
ac27a0ec
DK		 489}
490
b31e1552
ES		 491void ext4_msg (struct super_block * sb, const char *prefix,
492 const char *fmt, ...)
493{
494 va_list args;
495
496 va_start(args, fmt);
497 printk("%sEXT4-fs (%s): ", prefix, sb->s_id);
498 vprintk(fmt, args);
499 printk("\n");
500 va_end(args);
501}
502
12062ddd 503void __ext4_warning(struct super_block *sb, const char *function,
2b2d6d01 504 const char *fmt, ...)
ac27a0ec
DK		 505{
506 va_list args;
507
508 va_start(args, fmt);
617ba13b 509 printk(KERN_WARNING "EXT4-fs warning (device %s): %s: ",
ac27a0ec
DK		 510 sb->s_id, function);
511 vprintk(fmt, args);
512 printk("\n");
513 va_end(args);
514}
515
5d1b1b3f 516void ext4_grp_locked_error(struct super_block *sb, ext4_group_t grp,
0b8e58a1 517 const char *function, const char *fmt, ...)
5d1b1b3f
AK		 518__releases(bitlock)
519__acquires(bitlock)
520{
521 va_list args;
522 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
523
524 va_start(args, fmt);
525 printk(KERN_CRIT "EXT4-fs error (device %s): %s: ", sb->s_id, function);
526 vprintk(fmt, args);
527 printk("\n");
528 va_end(args);
529
530 if (test_opt(sb, ERRORS_CONT)) {
531 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
532 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
e2d67052 533 ext4_commit_super(sb, 0);
5d1b1b3f
AK		 534 return;
535 }
536 ext4_unlock_group(sb, grp);
537 ext4_handle_error(sb);
538 /*
539 * We only get here in the ERRORS_RO case; relocking the group
540 * may be dangerous, but nothing bad will happen since the
541 * filesystem will have already been marked read/only and the
542 * journal has been aborted. We return 1 as a hint to callers
543 * who might what to use the return value from
544 * ext4_grp_locked_error() to distinguish beween the
545 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
546 * aggressively from the ext4 function in question, with a
547 * more appropriate error code.
548 */
549 ext4_lock_group(sb, grp);
550 return;
551}
552
617ba13b 553void ext4_update_dynamic_rev(struct super_block *sb)
ac27a0ec 554{
617ba13b 555 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
ac27a0ec 556
617ba13b 557 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
ac27a0ec
DK		 558 return;
559
12062ddd 560 ext4_warning(sb,
ac27a0ec
DK		 561 "updating to rev %d because of new feature flag, "
562 "running e2fsck is recommended",
617ba13b 563 EXT4_DYNAMIC_REV);
ac27a0ec 564
617ba13b
MC		 565 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
566 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
567 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
ac27a0ec
DK		 568 /* leave es->s_feature_*compat flags alone */
569 /* es->s_uuid will be set by e2fsck if empty */
570
571 /*
572 * The rest of the superblock fields should be zero, and if not it
573 * means they are likely already in use, so leave them alone. We
574 * can leave it up to e2fsck to clean up any inconsistencies there.
575 */
576}
577
578/*
579 * Open the external journal device
580 */
b31e1552 581static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb)
ac27a0ec
DK		 582{
583 struct block_device *bdev;
584 char b[BDEVNAME_SIZE];
585
586 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
587 if (IS_ERR(bdev))
588 goto fail;
589 return bdev;
590
591fail:
b31e1552 592 ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld",
ac27a0ec
DK		 593 __bdevname(dev, b), PTR_ERR(bdev));
594 return NULL;
595}
596
597/*
598 * Release the journal device
599 */
617ba13b 600static int ext4_blkdev_put(struct block_device *bdev)
ac27a0ec
DK		 601{
602 bd_release(bdev);
9a1c3542 603 return blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
ac27a0ec
DK		 604}
605
617ba13b 606static int ext4_blkdev_remove(struct ext4_sb_info *sbi)
ac27a0ec
DK		 607{
608 struct block_device *bdev;
609 int ret = -ENODEV;
610
611 bdev = sbi->journal_bdev;
612 if (bdev) {
617ba13b 613 ret = ext4_blkdev_put(bdev);
ac27a0ec
DK		 614 sbi->journal_bdev = NULL;
615 }
616 return ret;
617}
618
619static inline struct inode *orphan_list_entry(struct list_head *l)
620{
617ba13b 621 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
ac27a0ec
DK		 622}
623
617ba13b 624static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
ac27a0ec
DK		 625{
626 struct list_head *l;
627
b31e1552
ES		 628 ext4_msg(sb, KERN_ERR, "sb orphan head is %d",
629 le32_to_cpu(sbi->s_es->s_last_orphan));
ac27a0ec
DK		 630
631 printk(KERN_ERR "sb_info orphan list:\n");
632 list_for_each(l, &sbi->s_orphan) {
633 struct inode *inode = orphan_list_entry(l);
634 printk(KERN_ERR " "
635 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
636 inode->i_sb->s_id, inode->i_ino, inode,
637 inode->i_mode, inode->i_nlink,
638 NEXT_ORPHAN(inode));
639 }
640}
641
2b2d6d01 642static void ext4_put_super(struct super_block *sb)
ac27a0ec 643{
617ba13b
MC		 644 struct ext4_sb_info *sbi = EXT4_SB(sb);
645 struct ext4_super_block *es = sbi->s_es;
ef2cabf7 646 int i, err;
ac27a0ec 647
e0ccfd95
CH		 648 dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
649
4c0425ff
MC		 650 flush_workqueue(sbi->dio_unwritten_wq);
651 destroy_workqueue(sbi->dio_unwritten_wq);
652
a9e220f8 653 lock_super(sb);
6cfd0148 654 lock_kernel();
8c85e125 655 if (sb->s_dirt)
ebc1ac16 656 ext4_commit_super(sb, 1);
8c85e125 657
0390131b
FM		 658 if (sbi->s_journal) {
659 err = jbd2_journal_destroy(sbi->s_journal);
660 sbi->s_journal = NULL;
661 if (err < 0)
662 ext4_abort(sb, __func__,
663 "Couldn't clean up the journal");
664 }
d4edac31
JB		 665
666 ext4_release_system_zone(sb);
667 ext4_mb_release(sb);
668 ext4_ext_release(sb);
669 ext4_xattr_put_super(sb);
670
ac27a0ec 671 if (!(sb->s_flags & MS_RDONLY)) {
617ba13b 672 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
ac27a0ec 673 es->s_state = cpu_to_le16(sbi->s_mount_state);
e2d67052 674 ext4_commit_super(sb, 1);
ac27a0ec 675 }
240799cd 676 if (sbi->s_proc) {
9f6200bb 677 remove_proc_entry(sb->s_id, ext4_proc_root);
240799cd 678 }
3197ebdb 679 kobject_del(&sbi->s_kobj);
ac27a0ec
DK		 680
681 for (i = 0; i < sbi->s_gdb_count; i++)
682 brelse(sbi->s_group_desc[i]);
683 kfree(sbi->s_group_desc);
c5ca7c76
TT		 684 if (is_vmalloc_addr(sbi->s_flex_groups))
685 vfree(sbi->s_flex_groups);
686 else
687 kfree(sbi->s_flex_groups);
ac27a0ec
DK		 688 percpu_counter_destroy(&sbi->s_freeblocks_counter);
689 percpu_counter_destroy(&sbi->s_freeinodes_counter);
690 percpu_counter_destroy(&sbi->s_dirs_counter);
6bc6e63f 691 percpu_counter_destroy(&sbi->s_dirtyblocks_counter);
ac27a0ec
DK		 692 brelse(sbi->s_sbh);
693#ifdef CONFIG_QUOTA
694 for (i = 0; i < MAXQUOTAS; i++)
695 kfree(sbi->s_qf_names[i]);
696#endif
697
698 /* Debugging code just in case the in-memory inode orphan list
699 * isn't empty. The on-disk one can be non-empty if we've
700 * detected an error and taken the fs readonly, but the
701 * in-memory list had better be clean by this point. */
702 if (!list_empty(&sbi->s_orphan))
703 dump_orphan_list(sb, sbi);
704 J_ASSERT(list_empty(&sbi->s_orphan));
705
f98393a6 706 invalidate_bdev(sb->s_bdev);
ac27a0ec
DK		 707 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
708 /*
709 * Invalidate the journal device's buffers. We don't want them
710 * floating about in memory - the physical journal device may
711 * hotswapped, and it breaks the `ro-after' testing code.
712 */
713 sync_blockdev(sbi->journal_bdev);
f98393a6 714 invalidate_bdev(sbi->journal_bdev);
617ba13b 715 ext4_blkdev_remove(sbi);
ac27a0ec
DK		 716 }
717 sb->s_fs_info = NULL;
3197ebdb
TT		 718 /*
719 * Now that we are completely done shutting down the
720 * superblock, we need to actually destroy the kobject.
721 */
722 unlock_kernel();
723 unlock_super(sb);
724 kobject_put(&sbi->s_kobj);
725 wait_for_completion(&sbi->s_kobj_unregister);
705895b6 726 kfree(sbi->s_blockgroup_lock);
ac27a0ec 727 kfree(sbi);
ac27a0ec
DK		 728}
729
e18b890b 730static struct kmem_cache *ext4_inode_cachep;
ac27a0ec
DK		 731
732/*
733 * Called inside transaction, so use GFP_NOFS
734 */
617ba13b 735static struct inode *ext4_alloc_inode(struct super_block *sb)
ac27a0ec 736{
617ba13b 737 struct ext4_inode_info *ei;
ac27a0ec 738
e6b4f8da 739 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
ac27a0ec
DK		 740 if (!ei)
741 return NULL;
0b8e58a1 742
ac27a0ec 743 ei->vfs_inode.i_version = 1;
91246c00 744 ei->vfs_inode.i_data.writeback_index = 0;
a86c6181 745 memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache));
c9de560d
AT		 746 INIT_LIST_HEAD(&ei->i_prealloc_list);
747 spin_lock_init(&ei->i_prealloc_lock);
0390131b
FM		 748 /*
749 * Note: We can be called before EXT4_SB(sb)->s_journal is set,
750 * therefore it can be null here. Don't check it, just initialize
751 * jinode.
752 */
678aaf48 753 jbd2_journal_init_jbd_inode(&ei->jinode, &ei->vfs_inode);
d2a17637
MC		 754 ei->i_reserved_data_blocks = 0;
755 ei->i_reserved_meta_blocks = 0;
756 ei->i_allocated_meta_blocks = 0;
9d0be502 757 ei->i_da_metadata_calc_len = 0;
d2a17637
MC		 758 ei->i_delalloc_reserved_flag = 0;
759 spin_lock_init(&(ei->i_block_reservation_lock));
a9e7f447
DM		 760#ifdef CONFIG_QUOTA
761 ei->i_reserved_quota = 0;
762#endif
c7064ef1 763 INIT_LIST_HEAD(&ei->i_completed_io_list);
744692dc 764 spin_lock_init(&ei->i_completed_io_lock);
8d5d02e6 765 ei->cur_aio_dio = NULL;
b436b9be
JK		 766 ei->i_sync_tid = 0;
767 ei->i_datasync_tid = 0;
0b8e58a1 768
ac27a0ec
DK		 769 return &ei->vfs_inode;
770}
771
617ba13b 772static void ext4_destroy_inode(struct inode *inode)
ac27a0ec 773{
9f7dd93d 774 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
b31e1552
ES		 775 ext4_msg(inode->i_sb, KERN_ERR,
776 "Inode %lu (%p): orphan list check failed!",
777 inode->i_ino, EXT4_I(inode));
9f7dd93d
VA		 778 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
779 EXT4_I(inode), sizeof(struct ext4_inode_info),
780 true);
781 dump_stack();
782 }
617ba13b 783 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
ac27a0ec
DK		 784}
785
51cc5068 786static void init_once(void *foo)
ac27a0ec 787{
617ba13b 788 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
ac27a0ec 789
a35afb83 790 INIT_LIST_HEAD(&ei->i_orphan);
03010a33 791#ifdef CONFIG_EXT4_FS_XATTR
a35afb83 792 init_rwsem(&ei->xattr_sem);
ac27a0ec 793#endif
0e855ac8 794 init_rwsem(&ei->i_data_sem);
a35afb83 795 inode_init_once(&ei->vfs_inode);
ac27a0ec
DK		 796}
797
798static int init_inodecache(void)
799{
617ba13b
MC		 800 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
801 sizeof(struct ext4_inode_info),
ac27a0ec
DK		 802 0, (SLAB_RECLAIM_ACCOUNT|
803 SLAB_MEM_SPREAD),
20c2df83 804 init_once);
617ba13b 805 if (ext4_inode_cachep == NULL)
ac27a0ec
DK		 806 return -ENOMEM;
807 return 0;
808}
809
810static void destroy_inodecache(void)
811{
617ba13b 812 kmem_cache_destroy(ext4_inode_cachep);
ac27a0ec
DK		 813}
814
617ba13b 815static void ext4_clear_inode(struct inode *inode)
ac27a0ec 816{
9f754758 817 dquot_drop(inode);
c2ea3fde 818 ext4_discard_preallocations(inode);
0390131b
FM		 819 if (EXT4_JOURNAL(inode))
820 jbd2_journal_release_jbd_inode(EXT4_SB(inode->i_sb)->s_journal,
678aaf48 821 &EXT4_I(inode)->jinode);
ac27a0ec
DK		 822}
823
2b2d6d01
TT		 824static inline void ext4_show_quota_options(struct seq_file *seq,
825 struct super_block *sb)
ac27a0ec
DK		 826{
827#if defined(CONFIG_QUOTA)
617ba13b 828 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 829
5a20bdfc
JK		 830 if (sbi->s_jquota_fmt) {
831 char *fmtname = "";
832
833 switch (sbi->s_jquota_fmt) {
834 case QFMT_VFS_OLD:
835 fmtname = "vfsold";
836 break;
837 case QFMT_VFS_V0:
838 fmtname = "vfsv0";
839 break;
840 case QFMT_VFS_V1:
841 fmtname = "vfsv1";
842 break;
843 }
844 seq_printf(seq, ",jqfmt=%s", fmtname);
845 }
ac27a0ec
DK		 846
847 if (sbi->s_qf_names[USRQUOTA])
848 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
849
850 if (sbi->s_qf_names[GRPQUOTA])
851 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
852
482a7425 853 if (test_opt(sb, USRQUOTA))
ac27a0ec
DK		 854 seq_puts(seq, ",usrquota");
855
482a7425 856 if (test_opt(sb, GRPQUOTA))
ac27a0ec
DK		 857 seq_puts(seq, ",grpquota");
858#endif
859}
860
d9c9bef1
MS		 861/*
862 * Show an option if
863 * - it's set to a non-default value OR
864 * - if the per-sb default is different from the global default
865 */
617ba13b 866static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs)
ac27a0ec 867{
aa22df2c
AK		 868 int def_errors;
869 unsigned long def_mount_opts;
ac27a0ec 870 struct super_block *sb = vfs->mnt_sb;
d9c9bef1
MS		 871 struct ext4_sb_info *sbi = EXT4_SB(sb);
872 struct ext4_super_block *es = sbi->s_es;
d9c9bef1
MS		 873
874 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
aa22df2c 875 def_errors = le16_to_cpu(es->s_errors);
d9c9bef1
MS		 876
877 if (sbi->s_sb_block != 1)
878 seq_printf(seq, ",sb=%llu", sbi->s_sb_block);
879 if (test_opt(sb, MINIX_DF))
880 seq_puts(seq, ",minixdf");
aa22df2c 881 if (test_opt(sb, GRPID) && !(def_mount_opts & EXT4_DEFM_BSDGROUPS))
d9c9bef1
MS		 882 seq_puts(seq, ",grpid");
883 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT4_DEFM_BSDGROUPS))
884 seq_puts(seq, ",nogrpid");
885 if (sbi->s_resuid != EXT4_DEF_RESUID ||
886 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID) {
887 seq_printf(seq, ",resuid=%u", sbi->s_resuid);
888 }
889 if (sbi->s_resgid != EXT4_DEF_RESGID ||
890 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID) {
891 seq_printf(seq, ",resgid=%u", sbi->s_resgid);
892 }
bb4f397a 893 if (test_opt(sb, ERRORS_RO)) {
d9c9bef1 894 if (def_errors == EXT4_ERRORS_PANIC ||
bb4f397a
AK		 895 def_errors == EXT4_ERRORS_CONTINUE) {
896 seq_puts(seq, ",errors=remount-ro");
d9c9bef1
MS		 897 }
898 }
aa22df2c 899 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
bb4f397a 900 seq_puts(seq, ",errors=continue");
aa22df2c 901 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
d9c9bef1 902 seq_puts(seq, ",errors=panic");
aa22df2c 903 if (test_opt(sb, NO_UID32) && !(def_mount_opts & EXT4_DEFM_UID16))
d9c9bef1 904 seq_puts(seq, ",nouid32");
aa22df2c 905 if (test_opt(sb, DEBUG) && !(def_mount_opts & EXT4_DEFM_DEBUG))
d9c9bef1
MS		 906 seq_puts(seq, ",debug");
907 if (test_opt(sb, OLDALLOC))
908 seq_puts(seq, ",oldalloc");
03010a33 909#ifdef CONFIG_EXT4_FS_XATTR
aa22df2c
AK		 910 if (test_opt(sb, XATTR_USER) &&
911 !(def_mount_opts & EXT4_DEFM_XATTR_USER))
d9c9bef1
MS		 912 seq_puts(seq, ",user_xattr");
913 if (!test_opt(sb, XATTR_USER) &&
914 (def_mount_opts & EXT4_DEFM_XATTR_USER)) {
915 seq_puts(seq, ",nouser_xattr");
916 }
917#endif
03010a33 918#ifdef CONFIG_EXT4_FS_POSIX_ACL
aa22df2c 919 if (test_opt(sb, POSIX_ACL) && !(def_mount_opts & EXT4_DEFM_ACL))
d9c9bef1
MS		 920 seq_puts(seq, ",acl");
921 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT4_DEFM_ACL))
922 seq_puts(seq, ",noacl");
923#endif
30773840 924 if (sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) {
d9c9bef1
MS		 925 seq_printf(seq, ",commit=%u",
926 (unsigned) (sbi->s_commit_interval / HZ));
927 }
30773840
TT		 928 if (sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME) {
929 seq_printf(seq, ",min_batch_time=%u",
930 (unsigned) sbi->s_min_batch_time);
931 }
932 if (sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME) {
933 seq_printf(seq, ",max_batch_time=%u",
934 (unsigned) sbi->s_min_batch_time);
935 }
936
571640ca
ES		 937 /*
938 * We're changing the default of barrier mount option, so
939 * let's always display its mount state so it's clear what its
940 * status is.
941 */
942 seq_puts(seq, ",barrier=");
943 seq_puts(seq, test_opt(sb, BARRIER) ? "1" : "0");
cd0b6a39
TT		 944 if (test_opt(sb, JOURNAL_ASYNC_COMMIT))
945 seq_puts(seq, ",journal_async_commit");
d9c9bef1
MS		 946 if (test_opt(sb, NOBH))
947 seq_puts(seq, ",nobh");
25ec56b5
JNC		 948 if (test_opt(sb, I_VERSION))
949 seq_puts(seq, ",i_version");
dd919b98
AK		 950 if (!test_opt(sb, DELALLOC))
951 seq_puts(seq, ",nodelalloc");
952
ac27a0ec 953
cb45bbe4
MS		 954 if (sbi->s_stripe)
955 seq_printf(seq, ",stripe=%lu", sbi->s_stripe);
aa22df2c
AK		 956 /*
957 * journal mode get enabled in different ways
958 * So just print the value even if we didn't specify it
959 */
617ba13b 960 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
ac27a0ec 961 seq_puts(seq, ",data=journal");
617ba13b 962 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
ac27a0ec 963 seq_puts(seq, ",data=ordered");
617ba13b 964 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
ac27a0ec
DK		 965 seq_puts(seq, ",data=writeback");
966
240799cd
TT		 967 if (sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
968 seq_printf(seq, ",inode_readahead_blks=%u",
969 sbi->s_inode_readahead_blks);
970
5bf5683a
HK		 971 if (test_opt(sb, DATA_ERR_ABORT))
972 seq_puts(seq, ",data_err=abort");
973
afd4672d 974 if (test_opt(sb, NO_AUTO_DA_ALLOC))
06705bff 975 seq_puts(seq, ",noauto_da_alloc");
afd4672d 976
5328e635
ES		 977 if (test_opt(sb, DISCARD))
978 seq_puts(seq, ",discard");
979
e3bb52ae
ES		 980 if (test_opt(sb, NOLOAD))
981 seq_puts(seq, ",norecovery");
982
744692dc
JZ		 983 if (test_opt(sb, DIOREAD_NOLOCK))
984 seq_puts(seq, ",dioread_nolock");
985
617ba13b 986 ext4_show_quota_options(seq, sb);
0b8e58a1 987
ac27a0ec
DK		 988 return 0;
989}
990
1b961ac0 991static struct inode *ext4_nfs_get_inode(struct super_block *sb,
0b8e58a1 992 u64 ino, u32 generation)
ac27a0ec 993{
ac27a0ec 994 struct inode *inode;
ac27a0ec 995
617ba13b 996 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
ac27a0ec 997 return ERR_PTR(-ESTALE);
617ba13b 998 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
ac27a0ec
DK		 999 return ERR_PTR(-ESTALE);
1000
1001 /* iget isn't really right if the inode is currently unallocated!!
1002 *
617ba13b 1003 * ext4_read_inode will return a bad_inode if the inode had been
ac27a0ec
DK		 1004 * deleted, so we should be safe.
1005 *
1006 * Currently we don't know the generation for parent directory, so
1007 * a generation of 0 means "accept any"
1008 */
1d1fe1ee
DH		 1009 inode = ext4_iget(sb, ino);
1010 if (IS_ERR(inode))
1011 return ERR_CAST(inode);
1012 if (generation && inode->i_generation != generation) {
ac27a0ec
DK		 1013 iput(inode);
1014 return ERR_PTR(-ESTALE);
1015 }
1b961ac0
CH		 1016
1017 return inode;
1018}
1019
1020static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
0b8e58a1 1021 int fh_len, int fh_type)
1b961ac0
CH		 1022{
1023 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
1024 ext4_nfs_get_inode);
1025}
1026
1027static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
0b8e58a1 1028 int fh_len, int fh_type)
1b961ac0
CH		 1029{
1030 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
1031 ext4_nfs_get_inode);
ac27a0ec
DK		 1032}
1033
c39a7f84
TO		 1034/*
1035 * Try to release metadata pages (indirect blocks, directories) which are
1036 * mapped via the block device. Since these pages could have journal heads
1037 * which would prevent try_to_free_buffers() from freeing them, we must use
1038 * jbd2 layer's try_to_free_buffers() function to release them.
1039 */
0b8e58a1
AD		 1040static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
1041 gfp_t wait)
c39a7f84
TO		 1042{
1043 journal_t *journal = EXT4_SB(sb)->s_journal;
1044
1045 WARN_ON(PageChecked(page));
1046 if (!page_has_buffers(page))
1047 return 0;
1048 if (journal)
1049 return jbd2_journal_try_to_free_buffers(journal, page,
1050 wait & ~__GFP_WAIT);
1051 return try_to_free_buffers(page);
1052}
1053
ac27a0ec 1054#ifdef CONFIG_QUOTA
af5bc92d 1055#define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
2b2d6d01 1056#define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
ac27a0ec 1057
617ba13b
MC		 1058static int ext4_write_dquot(struct dquot *dquot);
1059static int ext4_acquire_dquot(struct dquot *dquot);
1060static int ext4_release_dquot(struct dquot *dquot);
1061static int ext4_mark_dquot_dirty(struct dquot *dquot);
1062static int ext4_write_info(struct super_block *sb, int type);
6f28e087 1063static int ext4_quota_on(struct super_block *sb, int type, int format_id,
307ae18a 1064 char *path);
617ba13b
MC		 1065static int ext4_quota_on_mount(struct super_block *sb, int type);
1066static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec 1067 size_t len, loff_t off);
617ba13b 1068static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec
DK		 1069 const char *data, size_t len, loff_t off);
1070
61e225dc 1071static const struct dquot_operations ext4_quota_operations = {
a9e7f447 1072#ifdef CONFIG_QUOTA
60e58e0f 1073 .get_reserved_space = ext4_get_reserved_space,
a9e7f447 1074#endif
617ba13b
MC		 1075 .write_dquot = ext4_write_dquot,
1076 .acquire_dquot = ext4_acquire_dquot,
1077 .release_dquot = ext4_release_dquot,
1078 .mark_dirty = ext4_mark_dquot_dirty,
a5b5ee32
JK		 1079 .write_info = ext4_write_info,
1080 .alloc_dquot = dquot_alloc,
1081 .destroy_dquot = dquot_destroy,
ac27a0ec
DK		 1082};
1083
0d54b217 1084static const struct quotactl_ops ext4_qctl_operations = {
617ba13b 1085 .quota_on = ext4_quota_on,
ac27a0ec
DK		 1086 .quota_off = vfs_quota_off,
1087 .quota_sync = vfs_quota_sync,
1088 .get_info = vfs_get_dqinfo,
1089 .set_info = vfs_set_dqinfo,
1090 .get_dqblk = vfs_get_dqblk,
1091 .set_dqblk = vfs_set_dqblk
1092};
1093#endif
1094
ee9b6d61 1095static const struct super_operations ext4_sops = {
617ba13b
MC		 1096 .alloc_inode = ext4_alloc_inode,
1097 .destroy_inode = ext4_destroy_inode,
617ba13b
MC		 1098 .write_inode = ext4_write_inode,
1099 .dirty_inode = ext4_dirty_inode,
1100 .delete_inode = ext4_delete_inode,
1101 .put_super = ext4_put_super,
617ba13b 1102 .sync_fs = ext4_sync_fs,
c4be0c1d
TS		 1103 .freeze_fs = ext4_freeze,
1104 .unfreeze_fs = ext4_unfreeze,
617ba13b
MC		 1105 .statfs = ext4_statfs,
1106 .remount_fs = ext4_remount,
1107 .clear_inode = ext4_clear_inode,
1108 .show_options = ext4_show_options,
ac27a0ec 1109#ifdef CONFIG_QUOTA
617ba13b
MC		 1110 .quota_read = ext4_quota_read,
1111 .quota_write = ext4_quota_write,
ac27a0ec 1112#endif
c39a7f84 1113 .bdev_try_to_free_page = bdev_try_to_free_page,
ac27a0ec
DK		 1114};
1115
9ca92389
TT		 1116static const struct super_operations ext4_nojournal_sops = {
1117 .alloc_inode = ext4_alloc_inode,
1118 .destroy_inode = ext4_destroy_inode,
1119 .write_inode = ext4_write_inode,
1120 .dirty_inode = ext4_dirty_inode,
1121 .delete_inode = ext4_delete_inode,
1122 .write_super = ext4_write_super,
1123 .put_super = ext4_put_super,
1124 .statfs = ext4_statfs,
1125 .remount_fs = ext4_remount,
1126 .clear_inode = ext4_clear_inode,
1127 .show_options = ext4_show_options,
1128#ifdef CONFIG_QUOTA
1129 .quota_read = ext4_quota_read,
1130 .quota_write = ext4_quota_write,
1131#endif
1132 .bdev_try_to_free_page = bdev_try_to_free_page,
1133};
1134
39655164 1135static const struct export_operations ext4_export_ops = {
1b961ac0
CH		 1136 .fh_to_dentry = ext4_fh_to_dentry,
1137 .fh_to_parent = ext4_fh_to_parent,
617ba13b 1138 .get_parent = ext4_get_parent,
ac27a0ec
DK		 1139};
1140
1141enum {
1142 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
1143 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
01436ef2 1144 Opt_nouid32, Opt_debug, Opt_oldalloc, Opt_orlov,
ac27a0ec 1145 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
06705bff 1146 Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload, Opt_nobh, Opt_bh,
30773840 1147 Opt_commit, Opt_min_batch_time, Opt_max_batch_time,
c3191067 1148 Opt_journal_update, Opt_journal_dev,
818d276c 1149 Opt_journal_checksum, Opt_journal_async_commit,
ac27a0ec 1150 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
296c355c 1151 Opt_data_err_abort, Opt_data_err_ignore,
ac27a0ec 1152 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
5a20bdfc
JK		 1153 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
1154 Opt_noquota, Opt_ignore, Opt_barrier, Opt_nobarrier, Opt_err,
1155 Opt_resize, Opt_usrquota, Opt_grpquota, Opt_i_version,
01436ef2 1156 Opt_stripe, Opt_delalloc, Opt_nodelalloc,
6fd058f7 1157 Opt_block_validity, Opt_noblock_validity,
5328e635 1158 Opt_inode_readahead_blks, Opt_journal_ioprio,
744692dc 1159 Opt_dioread_nolock, Opt_dioread_lock,
5328e635 1160 Opt_discard, Opt_nodiscard,
ac27a0ec
DK		 1161};
1162
a447c093 1163static const match_table_t tokens = {
ac27a0ec
DK		 1164 {Opt_bsd_df, "bsddf"},
1165 {Opt_minix_df, "minixdf"},
1166 {Opt_grpid, "grpid"},
1167 {Opt_grpid, "bsdgroups"},
1168 {Opt_nogrpid, "nogrpid"},
1169 {Opt_nogrpid, "sysvgroups"},
1170 {Opt_resgid, "resgid=%u"},
1171 {Opt_resuid, "resuid=%u"},
1172 {Opt_sb, "sb=%u"},
1173 {Opt_err_cont, "errors=continue"},
1174 {Opt_err_panic, "errors=panic"},
1175 {Opt_err_ro, "errors=remount-ro"},
1176 {Opt_nouid32, "nouid32"},
ac27a0ec
DK		 1177 {Opt_debug, "debug"},
1178 {Opt_oldalloc, "oldalloc"},
1179 {Opt_orlov, "orlov"},
1180 {Opt_user_xattr, "user_xattr"},
1181 {Opt_nouser_xattr, "nouser_xattr"},
1182 {Opt_acl, "acl"},
1183 {Opt_noacl, "noacl"},
ac27a0ec 1184 {Opt_noload, "noload"},
e3bb52ae 1185 {Opt_noload, "norecovery"},
ac27a0ec
DK		 1186 {Opt_nobh, "nobh"},
1187 {Opt_bh, "bh"},
1188 {Opt_commit, "commit=%u"},
30773840
TT		 1189 {Opt_min_batch_time, "min_batch_time=%u"},
1190 {Opt_max_batch_time, "max_batch_time=%u"},
ac27a0ec 1191 {Opt_journal_update, "journal=update"},
ac27a0ec 1192 {Opt_journal_dev, "journal_dev=%u"},
818d276c
GS		 1193 {Opt_journal_checksum, "journal_checksum"},
1194 {Opt_journal_async_commit, "journal_async_commit"},
ac27a0ec
DK		 1195 {Opt_abort, "abort"},
1196 {Opt_data_journal, "data=journal"},
1197 {Opt_data_ordered, "data=ordered"},
1198 {Opt_data_writeback, "data=writeback"},
5bf5683a
HK		 1199 {Opt_data_err_abort, "data_err=abort"},
1200 {Opt_data_err_ignore, "data_err=ignore"},
ac27a0ec
DK		 1201 {Opt_offusrjquota, "usrjquota="},
1202 {Opt_usrjquota, "usrjquota=%s"},
1203 {Opt_offgrpjquota, "grpjquota="},
1204 {Opt_grpjquota, "grpjquota=%s"},
1205 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
1206 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
5a20bdfc 1207 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
ac27a0ec
DK		 1208 {Opt_grpquota, "grpquota"},
1209 {Opt_noquota, "noquota"},
1210 {Opt_quota, "quota"},
1211 {Opt_usrquota, "usrquota"},
1212 {Opt_barrier, "barrier=%u"},
06705bff
TT		 1213 {Opt_barrier, "barrier"},
1214 {Opt_nobarrier, "nobarrier"},
25ec56b5 1215 {Opt_i_version, "i_version"},
c9de560d 1216 {Opt_stripe, "stripe=%u"},
ac27a0ec 1217 {Opt_resize, "resize"},
64769240 1218 {Opt_delalloc, "delalloc"},
dd919b98 1219 {Opt_nodelalloc, "nodelalloc"},
6fd058f7
TT		 1220 {Opt_block_validity, "block_validity"},
1221 {Opt_noblock_validity, "noblock_validity"},
240799cd 1222 {Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
b3881f74 1223 {Opt_journal_ioprio, "journal_ioprio=%u"},
afd4672d 1224 {Opt_auto_da_alloc, "auto_da_alloc=%u"},
06705bff
TT		 1225 {Opt_auto_da_alloc, "auto_da_alloc"},
1226 {Opt_noauto_da_alloc, "noauto_da_alloc"},
744692dc
JZ		 1227 {Opt_dioread_nolock, "dioread_nolock"},
1228 {Opt_dioread_lock, "dioread_lock"},
5328e635
ES		 1229 {Opt_discard, "discard"},
1230 {Opt_nodiscard, "nodiscard"},
f3f12faa 1231 {Opt_err, NULL},
ac27a0ec
DK		 1232};
1233
617ba13b 1234static ext4_fsblk_t get_sb_block(void **data)
ac27a0ec 1235{
617ba13b 1236 ext4_fsblk_t sb_block;
ac27a0ec
DK		 1237 char *options = (char *) *data;
1238
1239 if (!options || strncmp(options, "sb=", 3) != 0)
1240 return 1; /* Default location */
0b8e58a1 1241
ac27a0ec 1242 options += 3;
0b8e58a1 1243 /* TODO: use simple_strtoll with >32bit ext4 */
ac27a0ec
DK		 1244 sb_block = simple_strtoul(options, &options, 0);
1245 if (*options && *options != ',') {
4776004f 1246 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
ac27a0ec
DK		 1247 (char *) *data);
1248 return 1;
1249 }
1250 if (*options == ',')
1251 options++;
1252 *data = (void *) options;
0b8e58a1 1253
ac27a0ec
DK		 1254 return sb_block;
1255}
1256
b3881f74 1257#define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
437ca0fd
DM		 1258static char deprecated_msg[] = "Mount option \"%s\" will be removed by %s\n"
1259 "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
b3881f74 1260
56c50f11
DM		 1261#ifdef CONFIG_QUOTA
1262static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
1263{
1264 struct ext4_sb_info *sbi = EXT4_SB(sb);
1265 char *qname;
1266
1267 if (sb_any_quota_loaded(sb) &&
1268 !sbi->s_qf_names[qtype]) {
1269 ext4_msg(sb, KERN_ERR,
1270 "Cannot change journaled "
1271 "quota options when quota turned on");
1272 return 0;
1273 }
1274 qname = match_strdup(args);
1275 if (!qname) {
1276 ext4_msg(sb, KERN_ERR,
1277 "Not enough memory for storing quotafile name");
1278 return 0;
1279 }
1280 if (sbi->s_qf_names[qtype] &&
1281 strcmp(sbi->s_qf_names[qtype], qname)) {
1282 ext4_msg(sb, KERN_ERR,
1283 "%s quota file already specified", QTYPE2NAME(qtype));
1284 kfree(qname);
1285 return 0;
1286 }
1287 sbi->s_qf_names[qtype] = qname;
1288 if (strchr(sbi->s_qf_names[qtype], '/')) {
1289 ext4_msg(sb, KERN_ERR,
1290 "quotafile must be on filesystem root");
1291 kfree(sbi->s_qf_names[qtype]);
1292 sbi->s_qf_names[qtype] = NULL;
1293 return 0;
1294 }
1295 set_opt(sbi->s_mount_opt, QUOTA);
1296 return 1;
1297}
1298
1299static int clear_qf_name(struct super_block *sb, int qtype)
1300{
1301
1302 struct ext4_sb_info *sbi = EXT4_SB(sb);
1303
1304 if (sb_any_quota_loaded(sb) &&
1305 sbi->s_qf_names[qtype]) {
1306 ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options"
1307 " when quota turned on");
1308 return 0;
1309 }
1310 /*
1311 * The space will be released later when all options are confirmed
1312 * to be correct
1313 */
1314 sbi->s_qf_names[qtype] = NULL;
1315 return 1;
1316}
1317#endif
1318
2b2d6d01 1319static int parse_options(char *options, struct super_block *sb,
c3191067 1320 unsigned long *journal_devnum,
b3881f74 1321 unsigned int *journal_ioprio,
2b2d6d01 1322 ext4_fsblk_t *n_blocks_count, int is_remount)
ac27a0ec 1323{
617ba13b 1324 struct ext4_sb_info *sbi = EXT4_SB(sb);
2b2d6d01 1325 char *p;
ac27a0ec
DK		 1326 substring_t args[MAX_OPT_ARGS];
1327 int data_opt = 0;
1328 int option;
1329#ifdef CONFIG_QUOTA
56c50f11 1330 int qfmt;
ac27a0ec
DK		 1331#endif
1332
1333 if (!options)
1334 return 1;
1335
2b2d6d01 1336 while ((p = strsep(&options, ",")) != NULL) {
ac27a0ec
DK		 1337 int token;
1338 if (!*p)
1339 continue;
1340
15121c18
ES		 1341 /*
1342 * Initialize args struct so we know whether arg was
1343 * found; some options take optional arguments.
1344 */
1345 args[0].to = args[0].from = 0;
ac27a0ec
DK		 1346 token = match_token(p, tokens, args);
1347 switch (token) {
1348 case Opt_bsd_df:
437ca0fd 1349 ext4_msg(sb, KERN_WARNING, deprecated_msg, p, "2.6.38");
2b2d6d01 1350 clear_opt(sbi->s_mount_opt, MINIX_DF);
ac27a0ec
DK		 1351 break;
1352 case Opt_minix_df:
437ca0fd 1353 ext4_msg(sb, KERN_WARNING, deprecated_msg, p, "2.6.38");
2b2d6d01 1354 set_opt(sbi->s_mount_opt, MINIX_DF);
437ca0fd 1355
ac27a0ec
DK		 1356 break;
1357 case Opt_grpid:
437ca0fd 1358 ext4_msg(sb, KERN_WARNING, deprecated_msg, p, "2.6.38");
2b2d6d01 1359 set_opt(sbi->s_mount_opt, GRPID);
437ca0fd 1360
ac27a0ec
DK		 1361 break;
1362 case Opt_nogrpid:
437ca0fd 1363 ext4_msg(sb, KERN_WARNING, deprecated_msg, p, "2.6.38");
2b2d6d01 1364 clear_opt(sbi->s_mount_opt, GRPID);
437ca0fd 1365
ac27a0ec
DK		 1366 break;
1367 case Opt_resuid:
1368 if (match_int(&args[0], &option))
1369 return 0;
1370 sbi->s_resuid = option;
1371 break;
1372 case Opt_resgid:
1373 if (match_int(&args[0], &option))
1374 return 0;
1375 sbi->s_resgid = option;
1376 break;
1377 case Opt_sb:
1378 /* handled by get_sb_block() instead of here */
1379 /* *sb_block = match_int(&args[0]); */
1380 break;
1381 case Opt_err_panic:
2b2d6d01
TT		 1382 clear_opt(sbi->s_mount_opt, ERRORS_CONT);
1383 clear_opt(sbi->s_mount_opt, ERRORS_RO);
1384 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
ac27a0ec
DK		 1385 break;
1386 case Opt_err_ro:
2b2d6d01
TT		 1387 clear_opt(sbi->s_mount_opt, ERRORS_CONT);
1388 clear_opt(sbi->s_mount_opt, ERRORS_PANIC);
1389 set_opt(sbi->s_mount_opt, ERRORS_RO);
ac27a0ec
DK		 1390 break;
1391 case Opt_err_cont:
2b2d6d01
TT		 1392 clear_opt(sbi->s_mount_opt, ERRORS_RO);
1393 clear_opt(sbi->s_mount_opt, ERRORS_PANIC);
1394 set_opt(sbi->s_mount_opt, ERRORS_CONT);
ac27a0ec
DK		 1395 break;
1396 case Opt_nouid32:
2b2d6d01 1397 set_opt(sbi->s_mount_opt, NO_UID32);
ac27a0ec 1398 break;
ac27a0ec 1399 case Opt_debug:
2b2d6d01 1400 set_opt(sbi->s_mount_opt, DEBUG);
ac27a0ec
DK		 1401 break;
1402 case Opt_oldalloc:
2b2d6d01 1403 set_opt(sbi->s_mount_opt, OLDALLOC);
ac27a0ec
DK		 1404 break;
1405 case Opt_orlov:
2b2d6d01 1406 clear_opt(sbi->s_mount_opt, OLDALLOC);
ac27a0ec 1407 break;
03010a33 1408#ifdef CONFIG_EXT4_FS_XATTR
ac27a0ec 1409 case Opt_user_xattr:
2b2d6d01 1410 set_opt(sbi->s_mount_opt, XATTR_USER);
ac27a0ec
DK		 1411 break;
1412 case Opt_nouser_xattr:
2b2d6d01 1413 clear_opt(sbi->s_mount_opt, XATTR_USER);
ac27a0ec
DK		 1414 break;
1415#else
1416 case Opt_user_xattr:
1417 case Opt_nouser_xattr:
b31e1552 1418 ext4_msg(sb, KERN_ERR, "(no)user_xattr options not supported");
ac27a0ec
DK		 1419 break;
1420#endif
03010a33 1421#ifdef CONFIG_EXT4_FS_POSIX_ACL
ac27a0ec
DK		 1422 case Opt_acl:
1423 set_opt(sbi->s_mount_opt, POSIX_ACL);
1424 break;
1425 case Opt_noacl:
1426 clear_opt(sbi->s_mount_opt, POSIX_ACL);
1427 break;
1428#else
1429 case Opt_acl:
1430 case Opt_noacl:
b31e1552 1431 ext4_msg(sb, KERN_ERR, "(no)acl options not supported");
ac27a0ec
DK		 1432 break;
1433#endif
ac27a0ec
DK		 1434 case Opt_journal_update:
1435 /* @@@ FIXME */
1436 /* Eventually we will want to be able to create
1437 a journal file here. For now, only allow the
1438 user to specify an existing inode to be the
1439 journal file. */
1440 if (is_remount) {
b31e1552
ES		 1441 ext4_msg(sb, KERN_ERR,
1442 "Cannot specify journal on remount");
ac27a0ec
DK		 1443 return 0;
1444 }
2b2d6d01 1445 set_opt(sbi->s_mount_opt, UPDATE_JOURNAL);
ac27a0ec 1446 break;
ac27a0ec
DK		 1447 case Opt_journal_dev:
1448 if (is_remount) {
b31e1552
ES		 1449 ext4_msg(sb, KERN_ERR,
1450 "Cannot specify journal on remount");
ac27a0ec
DK		 1451 return 0;
1452 }
1453 if (match_int(&args[0], &option))
1454 return 0;
1455 *journal_devnum = option;
1456 break;
818d276c 1457 case Opt_journal_checksum:
d4da6c9c
LT		 1458 set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM);
1459 break;
818d276c
GS		 1460 case Opt_journal_async_commit:
1461 set_opt(sbi->s_mount_opt, JOURNAL_ASYNC_COMMIT);
d4da6c9c 1462 set_opt(sbi->s_mount_opt, JOURNAL_CHECKSUM);
818d276c 1463 break;
ac27a0ec 1464 case Opt_noload:
2b2d6d01 1465 set_opt(sbi->s_mount_opt, NOLOAD);
ac27a0ec
DK		 1466 break;
1467 case Opt_commit:
1468 if (match_int(&args[0], &option))
1469 return 0;
1470 if (option < 0)
1471 return 0;
1472 if (option == 0)
cd02ff0b 1473 option = JBD2_DEFAULT_MAX_COMMIT_AGE;
ac27a0ec
DK		 1474 sbi->s_commit_interval = HZ * option;
1475 break;
30773840
TT		 1476 case Opt_max_batch_time:
1477 if (match_int(&args[0], &option))
1478 return 0;
1479 if (option < 0)
1480 return 0;
1481 if (option == 0)
1482 option = EXT4_DEF_MAX_BATCH_TIME;
1483 sbi->s_max_batch_time = option;
1484 break;
1485 case Opt_min_batch_time:
1486 if (match_int(&args[0], &option))
1487 return 0;
1488 if (option < 0)
1489 return 0;
1490 sbi->s_min_batch_time = option;
1491 break;
ac27a0ec 1492 case Opt_data_journal:
617ba13b 1493 data_opt = EXT4_MOUNT_JOURNAL_DATA;
ac27a0ec
DK		 1494 goto datacheck;
1495 case Opt_data_ordered:
617ba13b 1496 data_opt = EXT4_MOUNT_ORDERED_DATA;
ac27a0ec
DK		 1497 goto datacheck;
1498 case Opt_data_writeback:
617ba13b 1499 data_opt = EXT4_MOUNT_WRITEBACK_DATA;
ac27a0ec
DK		 1500 datacheck:
1501 if (is_remount) {
482a7425 1502 if (test_opt(sb, DATA_FLAGS) != data_opt) {
b31e1552
ES		 1503 ext4_msg(sb, KERN_ERR,
1504 "Cannot change data mode on remount");
ac27a0ec
DK		 1505 return 0;
1506 }
1507 } else {
482a7425 1508 clear_opt(sbi->s_mount_opt, DATA_FLAGS);
ac27a0ec
DK		 1509 sbi->s_mount_opt |= data_opt;
1510 }
1511 break;
5bf5683a
HK		 1512 case Opt_data_err_abort:
1513 set_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1514 break;
1515 case Opt_data_err_ignore:
1516 clear_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
1517 break;
ac27a0ec
DK		 1518#ifdef CONFIG_QUOTA
1519 case Opt_usrjquota:
56c50f11 1520 if (!set_qf_name(sb, USRQUOTA, &args[0]))
ac27a0ec 1521 return 0;
56c50f11
DM		 1522 break;
1523 case Opt_grpjquota:
1524 if (!set_qf_name(sb, GRPQUOTA, &args[0]))
ac27a0ec 1525 return 0;
ac27a0ec
DK		 1526 break;
1527 case Opt_offusrjquota:
56c50f11
DM		 1528 if (!clear_qf_name(sb, USRQUOTA))
1529 return 0;
1530 break;
ac27a0ec 1531 case Opt_offgrpjquota:
56c50f11 1532 if (!clear_qf_name(sb, GRPQUOTA))
ac27a0ec 1533 return 0;
ac27a0ec 1534 break;
56c50f11 1535
ac27a0ec 1536 case Opt_jqfmt_vfsold:
dfc5d03f
JK		 1537 qfmt = QFMT_VFS_OLD;
1538 goto set_qf_format;
ac27a0ec 1539 case Opt_jqfmt_vfsv0:
dfc5d03f 1540 qfmt = QFMT_VFS_V0;
5a20bdfc
JK		 1541 goto set_qf_format;
1542 case Opt_jqfmt_vfsv1:
1543 qfmt = QFMT_VFS_V1;
dfc5d03f 1544set_qf_format:
17bd13b3 1545 if (sb_any_quota_loaded(sb) &&
dfc5d03f 1546 sbi->s_jquota_fmt != qfmt) {
b31e1552 1547 ext4_msg(sb, KERN_ERR, "Cannot change "
dfc5d03f 1548 "journaled quota options when "
b31e1552 1549 "quota turned on");
dfc5d03f
JK		 1550 return 0;
1551 }
1552 sbi->s_jquota_fmt = qfmt;
ac27a0ec
DK		 1553 break;
1554 case Opt_quota:
1555 case Opt_usrquota:
1556 set_opt(sbi->s_mount_opt, QUOTA);
1557 set_opt(sbi->s_mount_opt, USRQUOTA);
1558 break;
1559 case Opt_grpquota:
1560 set_opt(sbi->s_mount_opt, QUOTA);
1561 set_opt(sbi->s_mount_opt, GRPQUOTA);
1562 break;
1563 case Opt_noquota:
17bd13b3 1564 if (sb_any_quota_loaded(sb)) {
b31e1552
ES		 1565 ext4_msg(sb, KERN_ERR, "Cannot change quota "
1566 "options when quota turned on");
ac27a0ec
DK		 1567 return 0;
1568 }
1569 clear_opt(sbi->s_mount_opt, QUOTA);
1570 clear_opt(sbi->s_mount_opt, USRQUOTA);
1571 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1572 break;
1573#else
1574 case Opt_quota:
1575 case Opt_usrquota:
1576 case Opt_grpquota:
b31e1552
ES		 1577 ext4_msg(sb, KERN_ERR,
1578 "quota options not supported");
cd59e7b9 1579 break;
ac27a0ec
DK		 1580 case Opt_usrjquota:
1581 case Opt_grpjquota:
1582 case Opt_offusrjquota:
1583 case Opt_offgrpjquota:
1584 case Opt_jqfmt_vfsold:
1585 case Opt_jqfmt_vfsv0:
5a20bdfc 1586 case Opt_jqfmt_vfsv1:
b31e1552
ES		 1587 ext4_msg(sb, KERN_ERR,
1588 "journaled quota options not supported");
ac27a0ec
DK		 1589 break;
1590 case Opt_noquota:
1591 break;
1592#endif
1593 case Opt_abort:
4ab2f15b 1594 sbi->s_mount_flags |= EXT4_MF_FS_ABORTED;
ac27a0ec 1595 break;
06705bff
TT		 1596 case Opt_nobarrier:
1597 clear_opt(sbi->s_mount_opt, BARRIER);
1598 break;
ac27a0ec 1599 case Opt_barrier:
15121c18
ES		 1600 if (args[0].from) {
1601 if (match_int(&args[0], &option))
1602 return 0;
1603 } else
1604 option = 1; /* No argument, default to 1 */
ac27a0ec
DK		 1605 if (option)
1606 set_opt(sbi->s_mount_opt, BARRIER);
1607 else
1608 clear_opt(sbi->s_mount_opt, BARRIER);
1609 break;
1610 case Opt_ignore:
1611 break;
1612 case Opt_resize:
1613 if (!is_remount) {
b31e1552
ES		 1614 ext4_msg(sb, KERN_ERR,
1615 "resize option only available "
1616 "for remount");
ac27a0ec
DK		 1617 return 0;
1618 }
1619 if (match_int(&args[0], &option) != 0)
1620 return 0;
1621 *n_blocks_count = option;
1622 break;
1623 case Opt_nobh:
1624 set_opt(sbi->s_mount_opt, NOBH);
1625 break;
1626 case Opt_bh:
1627 clear_opt(sbi->s_mount_opt, NOBH);
1628 break;
25ec56b5
JNC		 1629 case Opt_i_version:
1630 set_opt(sbi->s_mount_opt, I_VERSION);
1631 sb->s_flags |= MS_I_VERSION;
1632 break;
dd919b98
AK		 1633 case Opt_nodelalloc:
1634 clear_opt(sbi->s_mount_opt, DELALLOC);
1635 break;
c9de560d
AT		 1636 case Opt_stripe:
1637 if (match_int(&args[0], &option))
1638 return 0;
1639 if (option < 0)
1640 return 0;
1641 sbi->s_stripe = option;
1642 break;
64769240
AT		 1643 case Opt_delalloc:
1644 set_opt(sbi->s_mount_opt, DELALLOC);
1645 break;
6fd058f7
TT		 1646 case Opt_block_validity:
1647 set_opt(sbi->s_mount_opt, BLOCK_VALIDITY);
1648 break;
1649 case Opt_noblock_validity:
1650 clear_opt(sbi->s_mount_opt, BLOCK_VALIDITY);
1651 break;
240799cd
TT		 1652 case Opt_inode_readahead_blks:
1653 if (match_int(&args[0], &option))
1654 return 0;
1655 if (option < 0 || option > (1 << 30))
1656 return 0;
f7c43950 1657 if (!is_power_of_2(option)) {
b31e1552
ES		 1658 ext4_msg(sb, KERN_ERR,
1659 "EXT4-fs: inode_readahead_blks"
1660 " must be a power of 2");
3197ebdb
TT		 1661 return 0;
1662 }
240799cd
TT		 1663 sbi->s_inode_readahead_blks = option;
1664 break;
b3881f74
TT		 1665 case Opt_journal_ioprio:
1666 if (match_int(&args[0], &option))
1667 return 0;
1668 if (option < 0 || option > 7)
1669 break;
1670 *journal_ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE,
1671 option);
1672 break;
06705bff
TT		 1673 case Opt_noauto_da_alloc:
1674 set_opt(sbi->s_mount_opt,NO_AUTO_DA_ALLOC);
1675 break;
afd4672d 1676 case Opt_auto_da_alloc:
15121c18
ES		 1677 if (args[0].from) {
1678 if (match_int(&args[0], &option))
1679 return 0;
1680 } else
1681 option = 1; /* No argument, default to 1 */
afd4672d
TT		 1682 if (option)
1683 clear_opt(sbi->s_mount_opt, NO_AUTO_DA_ALLOC);
1684 else
1685 set_opt(sbi->s_mount_opt,NO_AUTO_DA_ALLOC);
1686 break;
5328e635
ES		 1687 case Opt_discard:
1688 set_opt(sbi->s_mount_opt, DISCARD);
1689 break;
1690 case Opt_nodiscard:
1691 clear_opt(sbi->s_mount_opt, DISCARD);
1692 break;
744692dc
JZ		 1693 case Opt_dioread_nolock:
1694 set_opt(sbi->s_mount_opt, DIOREAD_NOLOCK);
1695 break;
1696 case Opt_dioread_lock:
1697 clear_opt(sbi->s_mount_opt, DIOREAD_NOLOCK);
1698 break;
ac27a0ec 1699 default:
b31e1552
ES		 1700 ext4_msg(sb, KERN_ERR,
1701 "Unrecognized mount option \"%s\" "
1702 "or missing value", p);
ac27a0ec
DK		 1703 return 0;
1704 }
1705 }
1706#ifdef CONFIG_QUOTA
1707 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
482a7425 1708 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
ac27a0ec
DK		 1709 clear_opt(sbi->s_mount_opt, USRQUOTA);
1710
482a7425 1711 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
ac27a0ec
DK		 1712 clear_opt(sbi->s_mount_opt, GRPQUOTA);
1713
56c50f11 1714 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
b31e1552
ES		 1715 ext4_msg(sb, KERN_ERR, "old and new quota "
1716 "format mixing");
ac27a0ec
DK		 1717 return 0;
1718 }
1719
1720 if (!sbi->s_jquota_fmt) {
b31e1552
ES		 1721 ext4_msg(sb, KERN_ERR, "journaled quota format "
1722 "not specified");
ac27a0ec
DK		 1723 return 0;
1724 }
1725 } else {
1726 if (sbi->s_jquota_fmt) {
b31e1552 1727 ext4_msg(sb, KERN_ERR, "journaled quota format "
2c8be6b2 1728 "specified with no journaling "
b31e1552 1729 "enabled");
ac27a0ec
DK		 1730 return 0;
1731 }
1732 }
1733#endif
1734 return 1;
1735}
1736
617ba13b 1737static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
ac27a0ec
DK		 1738 int read_only)
1739{
617ba13b 1740 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec
DK		 1741 int res = 0;
1742
617ba13b 1743 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
b31e1552
ES		 1744 ext4_msg(sb, KERN_ERR, "revision level too high, "
1745 "forcing read-only mode");
ac27a0ec
DK		 1746 res = MS_RDONLY;
1747 }
1748 if (read_only)
1749 return res;
617ba13b 1750 if (!(sbi->s_mount_state & EXT4_VALID_FS))
b31e1552
ES		 1751 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
1752 "running e2fsck is recommended");
617ba13b 1753 else if ((sbi->s_mount_state & EXT4_ERROR_FS))
b31e1552
ES		 1754 ext4_msg(sb, KERN_WARNING,
1755 "warning: mounting fs with errors, "
1756 "running e2fsck is recommended");
ac27a0ec
DK		 1757 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 &&
1758 le16_to_cpu(es->s_mnt_count) >=
1759 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
b31e1552
ES		 1760 ext4_msg(sb, KERN_WARNING,
1761 "warning: maximal mount count reached, "
1762 "running e2fsck is recommended");
ac27a0ec
DK		 1763 else if (le32_to_cpu(es->s_checkinterval) &&
1764 (le32_to_cpu(es->s_lastcheck) +
1765 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
b31e1552
ES		 1766 ext4_msg(sb, KERN_WARNING,
1767 "warning: checktime reached, "
1768 "running e2fsck is recommended");
0b8e58a1 1769 if (!sbi->s_journal)
0390131b 1770 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
ac27a0ec 1771 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
617ba13b 1772 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
e8546d06 1773 le16_add_cpu(&es->s_mnt_count, 1);
ac27a0ec 1774 es->s_mtime = cpu_to_le32(get_seconds());
617ba13b 1775 ext4_update_dynamic_rev(sb);
0390131b
FM		 1776 if (sbi->s_journal)
1777 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
ac27a0ec 1778
e2d67052 1779 ext4_commit_super(sb, 1);
ac27a0ec 1780 if (test_opt(sb, DEBUG))
a9df9a49 1781 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
7f4520cc 1782 "bpg=%lu, ipg=%lu, mo=%04x]\n",
ac27a0ec
DK		 1783 sb->s_blocksize,
1784 sbi->s_groups_count,
617ba13b
MC		 1785 EXT4_BLOCKS_PER_GROUP(sb),
1786 EXT4_INODES_PER_GROUP(sb),
ac27a0ec
DK		 1787 sbi->s_mount_opt);
1788
ac27a0ec
DK		 1789 return res;
1790}
1791
772cb7c8
JS		 1792static int ext4_fill_flex_info(struct super_block *sb)
1793{
1794 struct ext4_sb_info *sbi = EXT4_SB(sb);
1795 struct ext4_group_desc *gdp = NULL;
772cb7c8
JS		 1796 ext4_group_t flex_group_count;
1797 ext4_group_t flex_group;
1798 int groups_per_flex = 0;
c5ca7c76 1799 size_t size;
772cb7c8
JS		 1800 int i;
1801
503358ae
TT		 1802 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
1803 groups_per_flex = 1 << sbi->s_log_groups_per_flex;
1804
1805 if (groups_per_flex < 2) {
772cb7c8
JS		 1806 sbi->s_log_groups_per_flex = 0;
1807 return 1;
1808 }
1809
c62a11fd
FB		 1810 /* We allocate both existing and potentially added groups */
1811 flex_group_count = ((sbi->s_groups_count + groups_per_flex - 1) +
d94e99a6
AK		 1812 ((le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) + 1) <<
1813 EXT4_DESC_PER_BLOCK_BITS(sb))) / groups_per_flex;
c5ca7c76
TT		 1814 size = flex_group_count * sizeof(struct flex_groups);
1815 sbi->s_flex_groups = kzalloc(size, GFP_KERNEL);
1816 if (sbi->s_flex_groups == NULL) {
1817 sbi->s_flex_groups = vmalloc(size);
1818 if (sbi->s_flex_groups)
1819 memset(sbi->s_flex_groups, 0, size);
1820 }
772cb7c8 1821 if (sbi->s_flex_groups == NULL) {
b31e1552
ES		 1822 ext4_msg(sb, KERN_ERR, "not enough memory for "
1823 "%u flex groups", flex_group_count);
772cb7c8
JS		 1824 goto failed;
1825 }
772cb7c8 1826
772cb7c8 1827 for (i = 0; i < sbi->s_groups_count; i++) {
88b6edd1 1828 gdp = ext4_get_group_desc(sb, i, NULL);
772cb7c8
JS		 1829
1830 flex_group = ext4_flex_group(sbi, i);
7ad9bb65
TT		 1831 atomic_add(ext4_free_inodes_count(sb, gdp),
1832 &sbi->s_flex_groups[flex_group].free_inodes);
1833 atomic_add(ext4_free_blks_count(sb, gdp),
1834 &sbi->s_flex_groups[flex_group].free_blocks);
1835 atomic_add(ext4_used_dirs_count(sb, gdp),
1836 &sbi->s_flex_groups[flex_group].used_dirs);
772cb7c8
JS		 1837 }
1838
1839 return 1;
1840failed:
1841 return 0;
1842}
1843
717d50e4
AD		 1844__le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
1845 struct ext4_group_desc *gdp)
1846{
1847 __u16 crc = 0;
1848
1849 if (sbi->s_es->s_feature_ro_compat &
1850 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) {
1851 int offset = offsetof(struct ext4_group_desc, bg_checksum);
1852 __le32 le_group = cpu_to_le32(block_group);
1853
1854 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
1855 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
1856 crc = crc16(crc, (__u8 *)gdp, offset);
1857 offset += sizeof(gdp->bg_checksum); /* skip checksum */
1858 /* for checksum of struct ext4_group_desc do the rest...*/
1859 if ((sbi->s_es->s_feature_incompat &
1860 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) &&
1861 offset < le16_to_cpu(sbi->s_es->s_desc_size))
1862 crc = crc16(crc, (__u8 *)gdp + offset,
1863 le16_to_cpu(sbi->s_es->s_desc_size) -
1864 offset);
1865 }
1866
1867 return cpu_to_le16(crc);
1868}
1869
1870int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 block_group,
1871 struct ext4_group_desc *gdp)
1872{
1873 if ((sbi->s_es->s_feature_ro_compat &
1874 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) &&
1875 (gdp->bg_checksum != ext4_group_desc_csum(sbi, block_group, gdp)))
1876 return 0;
1877
1878 return 1;
1879}
1880
ac27a0ec 1881/* Called at mount-time, super-block is locked */
197cd65a 1882static int ext4_check_descriptors(struct super_block *sb)
ac27a0ec 1883{
617ba13b
MC		 1884 struct ext4_sb_info *sbi = EXT4_SB(sb);
1885 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
1886 ext4_fsblk_t last_block;
bd81d8ee
LV		 1887 ext4_fsblk_t block_bitmap;
1888 ext4_fsblk_t inode_bitmap;
1889 ext4_fsblk_t inode_table;
ce421581 1890 int flexbg_flag = 0;
fd2d4291 1891 ext4_group_t i;
ac27a0ec 1892
ce421581
JS		 1893 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
1894 flexbg_flag = 1;
1895
af5bc92d 1896 ext4_debug("Checking group descriptors");
ac27a0ec 1897
197cd65a
AM		 1898 for (i = 0; i < sbi->s_groups_count; i++) {
1899 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
1900
ce421581 1901 if (i == sbi->s_groups_count - 1 || flexbg_flag)
bd81d8ee 1902 last_block = ext4_blocks_count(sbi->s_es) - 1;
ac27a0ec
DK		 1903 else
1904 last_block = first_block +
617ba13b 1905 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
ac27a0ec 1906
8fadc143 1907 block_bitmap = ext4_block_bitmap(sb, gdp);
2b2d6d01 1908 if (block_bitmap < first_block || block_bitmap > last_block) {
b31e1552 1909 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 1910 "Block bitmap for group %u not in group "
b31e1552 1911 "(block %llu)!", i, block_bitmap);
ac27a0ec
DK		 1912 return 0;
1913 }
8fadc143 1914 inode_bitmap = ext4_inode_bitmap(sb, gdp);
2b2d6d01 1915 if (inode_bitmap < first_block || inode_bitmap > last_block) {
b31e1552 1916 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 1917 "Inode bitmap for group %u not in group "
b31e1552 1918 "(block %llu)!", i, inode_bitmap);
ac27a0ec
DK		 1919 return 0;
1920 }
8fadc143 1921 inode_table = ext4_inode_table(sb, gdp);
bd81d8ee 1922 if (inode_table < first_block ||
2b2d6d01 1923 inode_table + sbi->s_itb_per_group - 1 > last_block) {
b31e1552 1924 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 1925 "Inode table for group %u not in group "
b31e1552 1926 "(block %llu)!", i, inode_table);
ac27a0ec
DK		 1927 return 0;
1928 }
955ce5f5 1929 ext4_lock_group(sb, i);
717d50e4 1930 if (!ext4_group_desc_csum_verify(sbi, i, gdp)) {
b31e1552
ES		 1931 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
1932 "Checksum for group %u failed (%u!=%u)",
1933 i, le16_to_cpu(ext4_group_desc_csum(sbi, i,
1934 gdp)), le16_to_cpu(gdp->bg_checksum));
7ee1ec4c 1935 if (!(sb->s_flags & MS_RDONLY)) {
955ce5f5 1936 ext4_unlock_group(sb, i);
8a266467 1937 return 0;
7ee1ec4c 1938 }
717d50e4 1939 }
955ce5f5 1940 ext4_unlock_group(sb, i);
ce421581
JS		 1941 if (!flexbg_flag)
1942 first_block += EXT4_BLOCKS_PER_GROUP(sb);
ac27a0ec
DK		 1943 }
1944
bd81d8ee 1945 ext4_free_blocks_count_set(sbi->s_es, ext4_count_free_blocks(sb));
0b8e58a1 1946 sbi->s_es->s_free_inodes_count =cpu_to_le32(ext4_count_free_inodes(sb));
ac27a0ec
DK		 1947 return 1;
1948}
1949
617ba13b 1950/* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
ac27a0ec
DK		 1951 * the superblock) which were deleted from all directories, but held open by
1952 * a process at the time of a crash. We walk the list and try to delete these
1953 * inodes at recovery time (only with a read-write filesystem).
1954 *
1955 * In order to keep the orphan inode chain consistent during traversal (in
1956 * case of crash during recovery), we link each inode into the superblock
1957 * orphan list_head and handle it the same way as an inode deletion during
1958 * normal operation (which journals the operations for us).
1959 *
1960 * We only do an iget() and an iput() on each inode, which is very safe if we
1961 * accidentally point at an in-use or already deleted inode. The worst that
1962 * can happen in this case is that we get a "bit already cleared" message from
617ba13b 1963 * ext4_free_inode(). The only reason we would point at a wrong inode is if
ac27a0ec
DK		 1964 * e2fsck was run on this filesystem, and it must have already done the orphan
1965 * inode cleanup for us, so we can safely abort without any further action.
1966 */
2b2d6d01
TT		 1967static void ext4_orphan_cleanup(struct super_block *sb,
1968 struct ext4_super_block *es)
ac27a0ec
DK		 1969{
1970 unsigned int s_flags = sb->s_flags;
1971 int nr_orphans = 0, nr_truncates = 0;
1972#ifdef CONFIG_QUOTA
1973 int i;
1974#endif
1975 if (!es->s_last_orphan) {
1976 jbd_debug(4, "no orphan inodes to clean up\n");
1977 return;
1978 }
1979
a8f48a95 1980 if (bdev_read_only(sb->s_bdev)) {
b31e1552
ES		 1981 ext4_msg(sb, KERN_ERR, "write access "
1982 "unavailable, skipping orphan cleanup");
a8f48a95
ES		 1983 return;
1984 }
1985
617ba13b 1986 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
ac27a0ec
DK		 1987 if (es->s_last_orphan)
1988 jbd_debug(1, "Errors on filesystem, "
1989 "clearing orphan list.\n");
1990 es->s_last_orphan = 0;
1991 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
1992 return;
1993 }
1994
1995 if (s_flags & MS_RDONLY) {
b31e1552 1996 ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
ac27a0ec
DK		 1997 sb->s_flags &= ~MS_RDONLY;
1998 }
1999#ifdef CONFIG_QUOTA
2000 /* Needed for iput() to work correctly and not trash data */
2001 sb->s_flags |= MS_ACTIVE;
2002 /* Turn on quotas so that they are updated correctly */
2003 for (i = 0; i < MAXQUOTAS; i++) {
617ba13b
MC		 2004 if (EXT4_SB(sb)->s_qf_names[i]) {
2005 int ret = ext4_quota_on_mount(sb, i);
ac27a0ec 2006 if (ret < 0)
b31e1552
ES		 2007 ext4_msg(sb, KERN_ERR,
2008 "Cannot turn on journaled "
2009 "quota: error %d", ret);
ac27a0ec
DK		 2010 }
2011 }
2012#endif
2013
2014 while (es->s_last_orphan) {
2015 struct inode *inode;
2016
97bd42b9
JB		 2017 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
2018 if (IS_ERR(inode)) {
ac27a0ec
DK		 2019 es->s_last_orphan = 0;
2020 break;
2021 }
2022
617ba13b 2023 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
871a2931 2024 dquot_initialize(inode);
ac27a0ec 2025 if (inode->i_nlink) {
b31e1552
ES		 2026 ext4_msg(sb, KERN_DEBUG,
2027 "%s: truncating inode %lu to %lld bytes",
46e665e9 2028 __func__, inode->i_ino, inode->i_size);
e5f8eab8 2029 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
ac27a0ec 2030 inode->i_ino, inode->i_size);
617ba13b 2031 ext4_truncate(inode);
ac27a0ec
DK		 2032 nr_truncates++;
2033 } else {
b31e1552
ES		 2034 ext4_msg(sb, KERN_DEBUG,
2035 "%s: deleting unreferenced inode %lu",
46e665e9 2036 __func__, inode->i_ino);
ac27a0ec
DK		 2037 jbd_debug(2, "deleting unreferenced inode %lu\n",
2038 inode->i_ino);
2039 nr_orphans++;
2040 }
2041 iput(inode); /* The delete magic happens here! */
2042 }
2043
2b2d6d01 2044#define PLURAL(x) (x), ((x) == 1) ? "" : "s"
ac27a0ec
DK		 2045
2046 if (nr_orphans)
b31e1552
ES		 2047 ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
2048 PLURAL(nr_orphans));
ac27a0ec 2049 if (nr_truncates)
b31e1552
ES		 2050 ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
2051 PLURAL(nr_truncates));
ac27a0ec
DK		 2052#ifdef CONFIG_QUOTA
2053 /* Turn quotas off */
2054 for (i = 0; i < MAXQUOTAS; i++) {
2055 if (sb_dqopt(sb)->files[i])
307ae18a 2056 vfs_quota_off(sb, i);
ac27a0ec
DK		 2057 }
2058#endif
2059 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
2060}
0b8e58a1 2061
cd2291a4
ES		 2062/*
2063 * Maximal extent format file size.
2064 * Resulting logical blkno at s_maxbytes must fit in our on-disk
2065 * extent format containers, within a sector_t, and within i_blocks
2066 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
2067 * so that won't be a limiting factor.
2068 *
2069 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
2070 */
f287a1a5 2071static loff_t ext4_max_size(int blkbits, int has_huge_files)
cd2291a4
ES		 2072{
2073 loff_t res;
2074 loff_t upper_limit = MAX_LFS_FILESIZE;
2075
2076 /* small i_blocks in vfs inode? */
f287a1a5 2077 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
cd2291a4 2078 /*
90c699a9 2079 * CONFIG_LBDAF is not enabled implies the inode
cd2291a4
ES		 2080 * i_block represent total blocks in 512 bytes
2081 * 32 == size of vfs inode i_blocks * 8
2082 */
2083 upper_limit = (1LL << 32) - 1;
2084
2085 /* total blocks in file system block size */
2086 upper_limit >>= (blkbits - 9);
2087 upper_limit <<= blkbits;
2088 }
2089
2090 /* 32-bit extent-start container, ee_block */
2091 res = 1LL << 32;
2092 res <<= blkbits;
2093 res -= 1;
2094
2095 /* Sanity check against vm- & vfs- imposed limits */
2096 if (res > upper_limit)
2097 res = upper_limit;
2098
2099 return res;
2100}
ac27a0ec 2101
ac27a0ec 2102/*
cd2291a4 2103 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
0fc1b451
AK		 2104 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2105 * We need to be 1 filesystem block less than the 2^48 sector limit.
ac27a0ec 2106 */
f287a1a5 2107static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
ac27a0ec 2108{
617ba13b 2109 loff_t res = EXT4_NDIR_BLOCKS;
0fc1b451
AK		 2110 int meta_blocks;
2111 loff_t upper_limit;
0b8e58a1
AD		 2112 /* This is calculated to be the largest file size for a dense, block
2113 * mapped file such that the file's total number of 512-byte sectors,
2114 * including data and all indirect blocks, does not exceed (2^48 - 1).
2115 *
2116 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2117 * number of 512-byte sectors of the file.
0fc1b451
AK		 2118 */
2119
f287a1a5 2120 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
0fc1b451 2121 /*
90c699a9 2122 * !has_huge_files or CONFIG_LBDAF not enabled implies that
0b8e58a1
AD		 2123 * the inode i_block field represents total file blocks in
2124 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
0fc1b451
AK		 2125 */
2126 upper_limit = (1LL << 32) - 1;
2127
2128 /* total blocks in file system block size */
2129 upper_limit >>= (bits - 9);
2130
2131 } else {
8180a562
AK		 2132 /*
2133 * We use 48 bit ext4_inode i_blocks
2134 * With EXT4_HUGE_FILE_FL set the i_blocks
2135 * represent total number of blocks in
2136 * file system block size
2137 */
0fc1b451
AK		 2138 upper_limit = (1LL << 48) - 1;
2139
0fc1b451
AK		 2140 }
2141
2142 /* indirect blocks */
2143 meta_blocks = 1;
2144 /* double indirect blocks */
2145 meta_blocks += 1 + (1LL << (bits-2));
2146 /* tripple indirect blocks */
2147 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
2148
2149 upper_limit -= meta_blocks;
2150 upper_limit <<= bits;
ac27a0ec
DK		 2151
2152 res += 1LL << (bits-2);
2153 res += 1LL << (2*(bits-2));
2154 res += 1LL << (3*(bits-2));
2155 res <<= bits;
2156 if (res > upper_limit)
2157 res = upper_limit;
0fc1b451
AK		 2158
2159 if (res > MAX_LFS_FILESIZE)
2160 res = MAX_LFS_FILESIZE;
2161
ac27a0ec
DK		 2162 return res;
2163}
2164
617ba13b 2165static ext4_fsblk_t descriptor_loc(struct super_block *sb,
0b8e58a1 2166 ext4_fsblk_t logical_sb_block, int nr)
ac27a0ec 2167{
617ba13b 2168 struct ext4_sb_info *sbi = EXT4_SB(sb);
fd2d4291 2169 ext4_group_t bg, first_meta_bg;
ac27a0ec
DK		 2170 int has_super = 0;
2171
2172 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
2173
617ba13b 2174 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
ac27a0ec 2175 nr < first_meta_bg)
70bbb3e0 2176 return logical_sb_block + nr + 1;
ac27a0ec 2177 bg = sbi->s_desc_per_block * nr;
617ba13b 2178 if (ext4_bg_has_super(sb, bg))
ac27a0ec 2179 has_super = 1;
0b8e58a1 2180
617ba13b 2181 return (has_super + ext4_group_first_block_no(sb, bg));
ac27a0ec
DK		 2182}
2183
c9de560d
AT		 2184/**
2185 * ext4_get_stripe_size: Get the stripe size.
2186 * @sbi: In memory super block info
2187 *
2188 * If we have specified it via mount option, then
2189 * use the mount option value. If the value specified at mount time is
2190 * greater than the blocks per group use the super block value.
2191 * If the super block value is greater than blocks per group return 0.
2192 * Allocator needs it be less than blocks per group.
2193 *
2194 */
2195static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
2196{
2197 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
2198 unsigned long stripe_width =
2199 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
2200
2201 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
2202 return sbi->s_stripe;
2203
2204 if (stripe_width <= sbi->s_blocks_per_group)
2205 return stripe_width;
2206
2207 if (stride <= sbi->s_blocks_per_group)
2208 return stride;
2209
2210 return 0;
2211}
ac27a0ec 2212
3197ebdb
TT		 2213/* sysfs supprt */
2214
2215struct ext4_attr {
2216 struct attribute attr;
2217 ssize_t (*show)(struct ext4_attr *, struct ext4_sb_info *, char *);
2218 ssize_t (*store)(struct ext4_attr *, struct ext4_sb_info *,
2219 const char *, size_t);
2220 int offset;
2221};
2222
2223static int parse_strtoul(const char *buf,
2224 unsigned long max, unsigned long *value)
2225{
2226 char *endp;
2227
e7d2860b
AGR		 2228 *value = simple_strtoul(skip_spaces(buf), &endp, 0);
2229 endp = skip_spaces(endp);
3197ebdb
TT		 2230 if (*endp || *value > max)
2231 return -EINVAL;
2232
2233 return 0;
2234}
2235
2236static ssize_t delayed_allocation_blocks_show(struct ext4_attr *a,
2237 struct ext4_sb_info *sbi,
2238 char *buf)
2239{
2240 return snprintf(buf, PAGE_SIZE, "%llu\n",
2241 (s64) percpu_counter_sum(&sbi->s_dirtyblocks_counter));
2242}
2243
2244static ssize_t session_write_kbytes_show(struct ext4_attr *a,
2245 struct ext4_sb_info *sbi, char *buf)
2246{
2247 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2248
2249 return snprintf(buf, PAGE_SIZE, "%lu\n",
2250 (part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
2251 sbi->s_sectors_written_start) >> 1);
2252}
2253
2254static ssize_t lifetime_write_kbytes_show(struct ext4_attr *a,
2255 struct ext4_sb_info *sbi, char *buf)
2256{
2257 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2258
2259 return snprintf(buf, PAGE_SIZE, "%llu\n",
a6b43e38 2260 (unsigned long long)(sbi->s_kbytes_written +
3197ebdb 2261 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
a6b43e38 2262 EXT4_SB(sb)->s_sectors_written_start) >> 1)));
3197ebdb
TT		 2263}
2264
2265static ssize_t inode_readahead_blks_store(struct ext4_attr *a,
2266 struct ext4_sb_info *sbi,
2267 const char *buf, size_t count)
2268{
2269 unsigned long t;
2270
2271 if (parse_strtoul(buf, 0x40000000, &t))
2272 return -EINVAL;
2273
f7c43950 2274 if (!is_power_of_2(t))
3197ebdb
TT		 2275 return -EINVAL;
2276
2277 sbi->s_inode_readahead_blks = t;
2278 return count;
2279}
2280
2281static ssize_t sbi_ui_show(struct ext4_attr *a,
0b8e58a1 2282 struct ext4_sb_info *sbi, char *buf)
3197ebdb
TT		 2283{
2284 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
2285
2286 return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
2287}
2288
2289static ssize_t sbi_ui_store(struct ext4_attr *a,
2290 struct ext4_sb_info *sbi,
2291 const char *buf, size_t count)
2292{
2293 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
2294 unsigned long t;
2295
2296 if (parse_strtoul(buf, 0xffffffff, &t))
2297 return -EINVAL;
2298 *ui = t;
2299 return count;
2300}
2301
2302#define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \
2303static struct ext4_attr ext4_attr_##_name = { \
2304 .attr = {.name = __stringify(_name), .mode = _mode }, \
2305 .show = _show, \
2306 .store = _store, \
2307 .offset = offsetof(struct ext4_sb_info, _elname), \
2308}
2309#define EXT4_ATTR(name, mode, show, store) \
2310static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store)
2311
2312#define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL)
2313#define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store)
2314#define EXT4_RW_ATTR_SBI_UI(name, elname) \
2315 EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname)
2316#define ATTR_LIST(name) &ext4_attr_##name.attr
2317
2318EXT4_RO_ATTR(delayed_allocation_blocks);
2319EXT4_RO_ATTR(session_write_kbytes);
2320EXT4_RO_ATTR(lifetime_write_kbytes);
2321EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, sbi_ui_show,
2322 inode_readahead_blks_store, s_inode_readahead_blks);
11013911 2323EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal);
3197ebdb
TT		 2324EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats);
2325EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan);
2326EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan);
2327EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs);
2328EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request);
2329EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc);
55138e0b 2330EXT4_RW_ATTR_SBI_UI(max_writeback_mb_bump, s_max_writeback_mb_bump);
3197ebdb
TT		 2331
2332static struct attribute *ext4_attrs[] = {
2333 ATTR_LIST(delayed_allocation_blocks),
2334 ATTR_LIST(session_write_kbytes),
2335 ATTR_LIST(lifetime_write_kbytes),
2336 ATTR_LIST(inode_readahead_blks),
11013911 2337 ATTR_LIST(inode_goal),
3197ebdb
TT		 2338 ATTR_LIST(mb_stats),
2339 ATTR_LIST(mb_max_to_scan),
2340 ATTR_LIST(mb_min_to_scan),
2341 ATTR_LIST(mb_order2_req),
2342 ATTR_LIST(mb_stream_req),
2343 ATTR_LIST(mb_group_prealloc),
55138e0b 2344 ATTR_LIST(max_writeback_mb_bump),
3197ebdb
TT		 2345 NULL,
2346};
2347
2348static ssize_t ext4_attr_show(struct kobject *kobj,
2349 struct attribute *attr, char *buf)
2350{
2351 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2352 s_kobj);
2353 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2354
2355 return a->show ? a->show(a, sbi, buf) : 0;
2356}
2357
2358static ssize_t ext4_attr_store(struct kobject *kobj,
2359 struct attribute *attr,
2360 const char *buf, size_t len)
2361{
2362 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2363 s_kobj);
2364 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2365
2366 return a->store ? a->store(a, sbi, buf, len) : 0;
2367}
2368
2369static void ext4_sb_release(struct kobject *kobj)
2370{
2371 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2372 s_kobj);
2373 complete(&sbi->s_kobj_unregister);
2374}
2375
2376
52cf25d0 2377static const struct sysfs_ops ext4_attr_ops = {
3197ebdb
TT		 2378 .show = ext4_attr_show,
2379 .store = ext4_attr_store,
2380};
2381
2382static struct kobj_type ext4_ktype = {
2383 .default_attrs = ext4_attrs,
2384 .sysfs_ops = &ext4_attr_ops,
2385 .release = ext4_sb_release,
2386};
2387
a13fb1a4
ES		 2388/*
2389 * Check whether this filesystem can be mounted based on
2390 * the features present and the RDONLY/RDWR mount requested.
2391 * Returns 1 if this filesystem can be mounted as requested,
2392 * 0 if it cannot be.
2393 */
2394static int ext4_feature_set_ok(struct super_block *sb, int readonly)
2395{
2396 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP)) {
2397 ext4_msg(sb, KERN_ERR,
2398 "Couldn't mount because of "
2399 "unsupported optional features (%x)",
2400 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
2401 ~EXT4_FEATURE_INCOMPAT_SUPP));
2402 return 0;
2403 }
2404
2405 if (readonly)
2406 return 1;
2407
2408 /* Check that feature set is OK for a read-write mount */
2409 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP)) {
2410 ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of "
2411 "unsupported optional features (%x)",
2412 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
2413 ~EXT4_FEATURE_RO_COMPAT_SUPP));
2414 return 0;
2415 }
2416 /*
2417 * Large file size enabled file system can only be mounted
2418 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
2419 */
2420 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) {
2421 if (sizeof(blkcnt_t) < sizeof(u64)) {
2422 ext4_msg(sb, KERN_ERR, "Filesystem with huge files "
2423 "cannot be mounted RDWR without "
2424 "CONFIG_LBDAF");
2425 return 0;
2426 }
2427 }
2428 return 1;
2429}
2430
2b2d6d01 2431static int ext4_fill_super(struct super_block *sb, void *data, int silent)
7477827f
AK		 2432 __releases(kernel_lock)
2433 __acquires(kernel_lock)
ac27a0ec 2434{
2b2d6d01 2435 struct buffer_head *bh;
617ba13b
MC		 2436 struct ext4_super_block *es = NULL;
2437 struct ext4_sb_info *sbi;
2438 ext4_fsblk_t block;
2439 ext4_fsblk_t sb_block = get_sb_block(&data);
70bbb3e0 2440 ext4_fsblk_t logical_sb_block;
ac27a0ec 2441 unsigned long offset = 0;
ac27a0ec
DK		 2442 unsigned long journal_devnum = 0;
2443 unsigned long def_mount_opts;
2444 struct inode *root;
9f6200bb 2445 char *cp;
0390131b 2446 const char *descr;
1d1fe1ee 2447 int ret = -EINVAL;
ac27a0ec 2448 int blocksize;
4ec11028
TT		 2449 unsigned int db_count;
2450 unsigned int i;
f287a1a5 2451 int needs_recovery, has_huge_files;
bd81d8ee 2452 __u64 blocks_count;
833f4077 2453 int err;
b3881f74 2454 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
ac27a0ec
DK		 2455
2456 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
2457 if (!sbi)
2458 return -ENOMEM;
705895b6
PE		 2459
2460 sbi->s_blockgroup_lock =
2461 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
2462 if (!sbi->s_blockgroup_lock) {
2463 kfree(sbi);
2464 return -ENOMEM;
2465 }
ac27a0ec
DK		 2466 sb->s_fs_info = sbi;
2467 sbi->s_mount_opt = 0;
617ba13b
MC		 2468 sbi->s_resuid = EXT4_DEF_RESUID;
2469 sbi->s_resgid = EXT4_DEF_RESGID;
240799cd 2470 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
d9c9bef1 2471 sbi->s_sb_block = sb_block;
afc32f7e
TT		 2472 sbi->s_sectors_written_start = part_stat_read(sb->s_bdev->bd_part,
2473 sectors[1]);
ac27a0ec
DK		 2474
2475 unlock_kernel();
2476
9f6200bb
TT		 2477 /* Cleanup superblock name */
2478 for (cp = sb->s_id; (cp = strchr(cp, '/'));)
2479 *cp = '!';
2480
617ba13b 2481 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
ac27a0ec 2482 if (!blocksize) {
b31e1552 2483 ext4_msg(sb, KERN_ERR, "unable to set blocksize");
ac27a0ec
DK		 2484 goto out_fail;
2485 }
2486
2487 /*
617ba13b 2488 * The ext4 superblock will not be buffer aligned for other than 1kB
ac27a0ec
DK		 2489 * block sizes. We need to calculate the offset from buffer start.
2490 */
617ba13b 2491 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
70bbb3e0
AM		 2492 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
2493 offset = do_div(logical_sb_block, blocksize);
ac27a0ec 2494 } else {
70bbb3e0 2495 logical_sb_block = sb_block;
ac27a0ec
DK		 2496 }
2497
70bbb3e0 2498 if (!(bh = sb_bread(sb, logical_sb_block))) {
b31e1552 2499 ext4_msg(sb, KERN_ERR, "unable to read superblock");
ac27a0ec
DK		 2500 goto out_fail;
2501 }
2502 /*
2503 * Note: s_es must be initialized as soon as possible because
617ba13b 2504 * some ext4 macro-instructions depend on its value
ac27a0ec 2505 */
617ba13b 2506 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
ac27a0ec
DK		 2507 sbi->s_es = es;
2508 sb->s_magic = le16_to_cpu(es->s_magic);
617ba13b
MC		 2509 if (sb->s_magic != EXT4_SUPER_MAGIC)
2510 goto cantfind_ext4;
afc32f7e 2511 sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
ac27a0ec
DK		 2512
2513 /* Set defaults before we parse the mount options */
2514 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
617ba13b 2515 if (def_mount_opts & EXT4_DEFM_DEBUG)
ac27a0ec 2516 set_opt(sbi->s_mount_opt, DEBUG);
437ca0fd
DM		 2517 if (def_mount_opts & EXT4_DEFM_BSDGROUPS) {
2518 ext4_msg(sb, KERN_WARNING, deprecated_msg, "bsdgroups",
2519 "2.6.38");
ac27a0ec 2520 set_opt(sbi->s_mount_opt, GRPID);
437ca0fd 2521 }
617ba13b 2522 if (def_mount_opts & EXT4_DEFM_UID16)
ac27a0ec 2523 set_opt(sbi->s_mount_opt, NO_UID32);
03010a33 2524#ifdef CONFIG_EXT4_FS_XATTR
617ba13b 2525 if (def_mount_opts & EXT4_DEFM_XATTR_USER)
ac27a0ec 2526 set_opt(sbi->s_mount_opt, XATTR_USER);
2e7842b8 2527#endif
03010a33 2528#ifdef CONFIG_EXT4_FS_POSIX_ACL
617ba13b 2529 if (def_mount_opts & EXT4_DEFM_ACL)
ac27a0ec 2530 set_opt(sbi->s_mount_opt, POSIX_ACL);
2e7842b8 2531#endif
617ba13b 2532 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
482a7425 2533 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
617ba13b 2534 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
482a7425 2535 set_opt(sbi->s_mount_opt, ORDERED_DATA);
617ba13b 2536 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
482a7425 2537 set_opt(sbi->s_mount_opt, WRITEBACK_DATA);
617ba13b
MC		 2538
2539 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
ac27a0ec 2540 set_opt(sbi->s_mount_opt, ERRORS_PANIC);
bb4f397a 2541 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
ceea16bf 2542 set_opt(sbi->s_mount_opt, ERRORS_CONT);
bb4f397a
AK		 2543 else
2544 set_opt(sbi->s_mount_opt, ERRORS_RO);
ac27a0ec
DK		 2545
2546 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
2547 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
30773840
TT		 2548 sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
2549 sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
2550 sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
ac27a0ec 2551
571640ca 2552 set_opt(sbi->s_mount_opt, BARRIER);
ac27a0ec 2553
dd919b98
AK		 2554 /*
2555 * enable delayed allocation by default
2556 * Use -o nodelalloc to turn it off
2557 */
ba69f9ab
JK		 2558 if (!IS_EXT3_SB(sb))
2559 set_opt(sbi->s_mount_opt, DELALLOC);
dd919b98 2560
b3881f74
TT		 2561 if (!parse_options((char *) data, sb, &journal_devnum,
2562 &journal_ioprio, NULL, 0))
ac27a0ec
DK		 2563 goto failed_mount;
2564
2565 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
482a7425 2566 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec 2567
617ba13b
MC		 2568 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
2569 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
2570 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
2571 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
b31e1552
ES		 2572 ext4_msg(sb, KERN_WARNING,
2573 "feature flags set on rev 0 fs, "
2574 "running e2fsck is recommended");
469108ff 2575
ac27a0ec
DK		 2576 /*
2577 * Check feature flags regardless of the revision level, since we
2578 * previously didn't change the revision level when setting the flags,
2579 * so there is a chance incompat flags are set on a rev 0 filesystem.
2580 */
a13fb1a4 2581 if (!ext4_feature_set_ok(sb, (sb->s_flags & MS_RDONLY)))
ac27a0ec 2582 goto failed_mount;
a13fb1a4 2583
ac27a0ec
DK		 2584 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
2585
617ba13b
MC		 2586 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
2587 blocksize > EXT4_MAX_BLOCK_SIZE) {
b31e1552
ES		 2588 ext4_msg(sb, KERN_ERR,
2589 "Unsupported filesystem blocksize %d", blocksize);
ac27a0ec
DK		 2590 goto failed_mount;
2591 }
2592
ac27a0ec 2593 if (sb->s_blocksize != blocksize) {
ce40733c
AK		 2594 /* Validate the filesystem blocksize */
2595 if (!sb_set_blocksize(sb, blocksize)) {
b31e1552 2596 ext4_msg(sb, KERN_ERR, "bad block size %d",
ce40733c 2597 blocksize);
ac27a0ec
DK		 2598 goto failed_mount;
2599 }
2600
2b2d6d01 2601 brelse(bh);
70bbb3e0
AM		 2602 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
2603 offset = do_div(logical_sb_block, blocksize);
2604 bh = sb_bread(sb, logical_sb_block);
ac27a0ec 2605 if (!bh) {
b31e1552
ES		 2606 ext4_msg(sb, KERN_ERR,
2607 "Can't read superblock on 2nd try");
ac27a0ec
DK		 2608 goto failed_mount;
2609 }
617ba13b 2610 es = (struct ext4_super_block *)(((char *)bh->b_data) + offset);
ac27a0ec 2611 sbi->s_es = es;
617ba13b 2612 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
b31e1552
ES		 2613 ext4_msg(sb, KERN_ERR,
2614 "Magic mismatch, very weird!");
ac27a0ec
DK		 2615 goto failed_mount;
2616 }
2617 }
2618
a13fb1a4
ES		 2619 has_huge_files = EXT4_HAS_RO_COMPAT_FEATURE(sb,
2620 EXT4_FEATURE_RO_COMPAT_HUGE_FILE);
f287a1a5
TT		 2621 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
2622 has_huge_files);
2623 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
ac27a0ec 2624
617ba13b
MC		 2625 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
2626 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
2627 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
ac27a0ec
DK		 2628 } else {
2629 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
2630 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
617ba13b 2631 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
1330593e 2632 (!is_power_of_2(sbi->s_inode_size)) ||
ac27a0ec 2633 (sbi->s_inode_size > blocksize)) {
b31e1552
ES		 2634 ext4_msg(sb, KERN_ERR,
2635 "unsupported inode size: %d",
2b2d6d01 2636 sbi->s_inode_size);
ac27a0ec
DK		 2637 goto failed_mount;
2638 }
ef7f3835
KS		 2639 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
2640 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
ac27a0ec 2641 }
0b8e58a1 2642
0d1ee42f
AR		 2643 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
2644 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
8fadc143 2645 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
0d1ee42f 2646 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
d8ea6cf8 2647 !is_power_of_2(sbi->s_desc_size)) {
b31e1552
ES		 2648 ext4_msg(sb, KERN_ERR,
2649 "unsupported descriptor size %lu",
0d1ee42f
AR		 2650 sbi->s_desc_size);
2651 goto failed_mount;
2652 }
2653 } else
2654 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
0b8e58a1 2655
ac27a0ec 2656 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
ac27a0ec 2657 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
b47b6f38 2658 if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
617ba13b 2659 goto cantfind_ext4;
0b8e58a1 2660
617ba13b 2661 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
ac27a0ec 2662 if (sbi->s_inodes_per_block == 0)
617ba13b 2663 goto cantfind_ext4;
ac27a0ec
DK		 2664 sbi->s_itb_per_group = sbi->s_inodes_per_group /
2665 sbi->s_inodes_per_block;
0d1ee42f 2666 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
ac27a0ec
DK		 2667 sbi->s_sbh = bh;
2668 sbi->s_mount_state = le16_to_cpu(es->s_state);
e57aa839
FW		 2669 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
2670 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
0b8e58a1 2671
2b2d6d01 2672 for (i = 0; i < 4; i++)
ac27a0ec
DK		 2673 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
2674 sbi->s_def_hash_version = es->s_def_hash_version;
f99b2589
TT		 2675 i = le32_to_cpu(es->s_flags);
2676 if (i & EXT2_FLAGS_UNSIGNED_HASH)
2677 sbi->s_hash_unsigned = 3;
2678 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
2679#ifdef __CHAR_UNSIGNED__
2680 es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
2681 sbi->s_hash_unsigned = 3;
2682#else
2683 es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
2684#endif
2685 sb->s_dirt = 1;
2686 }
ac27a0ec
DK		 2687
2688 if (sbi->s_blocks_per_group > blocksize * 8) {
b31e1552
ES		 2689 ext4_msg(sb, KERN_ERR,
2690 "#blocks per group too big: %lu",
2b2d6d01 2691 sbi->s_blocks_per_group);
ac27a0ec
DK		 2692 goto failed_mount;
2693 }
ac27a0ec 2694 if (sbi->s_inodes_per_group > blocksize * 8) {
b31e1552
ES		 2695 ext4_msg(sb, KERN_ERR,
2696 "#inodes per group too big: %lu",
2b2d6d01 2697 sbi->s_inodes_per_group);
ac27a0ec
DK		 2698 goto failed_mount;
2699 }
2700
bf43d84b
ES		 2701 /*
2702 * Test whether we have more sectors than will fit in sector_t,
2703 * and whether the max offset is addressable by the page cache.
2704 */
2705 if ((ext4_blocks_count(es) >
2706 (sector_t)(~0ULL) >> (sb->s_blocksize_bits - 9)) ||
2707 (ext4_blocks_count(es) >
2708 (pgoff_t)(~0ULL) >> (PAGE_CACHE_SHIFT - sb->s_blocksize_bits))) {
b31e1552 2709 ext4_msg(sb, KERN_ERR, "filesystem"
bf43d84b 2710 " too large to mount safely on this system");
ac27a0ec 2711 if (sizeof(sector_t) < 8)
90c699a9 2712 ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled");
bf43d84b 2713 ret = -EFBIG;
ac27a0ec
DK		 2714 goto failed_mount;
2715 }
2716
617ba13b
MC		 2717 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
2718 goto cantfind_ext4;
e7c95593 2719
0f2ddca6
FTN		 2720 /* check blocks count against device size */
2721 blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
2722 if (blocks_count && ext4_blocks_count(es) > blocks_count) {
b31e1552
ES		 2723 ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
2724 "exceeds size of device (%llu blocks)",
0f2ddca6
FTN		 2725 ext4_blocks_count(es), blocks_count);
2726 goto failed_mount;
2727 }
2728
0b8e58a1
AD		 2729 /*
2730 * It makes no sense for the first data block to be beyond the end
2731 * of the filesystem.
2732 */
2733 if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
b31e1552
ES		 2734 ext4_msg(sb, KERN_WARNING, "bad geometry: first data"
2735 "block %u is beyond end of filesystem (%llu)",
2736 le32_to_cpu(es->s_first_data_block),
2737 ext4_blocks_count(es));
e7c95593
ES		 2738 goto failed_mount;
2739 }
bd81d8ee
LV		 2740 blocks_count = (ext4_blocks_count(es) -
2741 le32_to_cpu(es->s_first_data_block) +
2742 EXT4_BLOCKS_PER_GROUP(sb) - 1);
2743 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
4ec11028 2744 if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
b31e1552 2745 ext4_msg(sb, KERN_WARNING, "groups count too large: %u "
4ec11028 2746 "(block count %llu, first data block %u, "
b31e1552 2747 "blocks per group %lu)", sbi->s_groups_count,
4ec11028
TT		 2748 ext4_blocks_count(es),
2749 le32_to_cpu(es->s_first_data_block),
2750 EXT4_BLOCKS_PER_GROUP(sb));
2751 goto failed_mount;
2752 }
bd81d8ee 2753 sbi->s_groups_count = blocks_count;
fb0a387d
ES		 2754 sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
2755 (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
617ba13b
MC		 2756 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
2757 EXT4_DESC_PER_BLOCK(sb);
2b2d6d01 2758 sbi->s_group_desc = kmalloc(db_count * sizeof(struct buffer_head *),
ac27a0ec
DK		 2759 GFP_KERNEL);
2760 if (sbi->s_group_desc == NULL) {
b31e1552 2761 ext4_msg(sb, KERN_ERR, "not enough memory");
ac27a0ec
DK		 2762 goto failed_mount;
2763 }
2764
3244fcb1 2765#ifdef CONFIG_PROC_FS
9f6200bb
TT		 2766 if (ext4_proc_root)
2767 sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);
3244fcb1 2768#endif
240799cd 2769
705895b6 2770 bgl_lock_init(sbi->s_blockgroup_lock);
ac27a0ec
DK		 2771
2772 for (i = 0; i < db_count; i++) {
70bbb3e0 2773 block = descriptor_loc(sb, logical_sb_block, i);
ac27a0ec
DK		 2774 sbi->s_group_desc[i] = sb_bread(sb, block);
2775 if (!sbi->s_group_desc[i]) {
b31e1552
ES		 2776 ext4_msg(sb, KERN_ERR,
2777 "can't read group descriptor %d", i);
ac27a0ec
DK		 2778 db_count = i;
2779 goto failed_mount2;
2780 }
2781 }
2b2d6d01 2782 if (!ext4_check_descriptors(sb)) {
b31e1552 2783 ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
ac27a0ec
DK		 2784 goto failed_mount2;
2785 }
772cb7c8
JS		 2786 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
2787 if (!ext4_fill_flex_info(sb)) {
b31e1552
ES		 2788 ext4_msg(sb, KERN_ERR,
2789 "unable to initialize "
2790 "flex_bg meta info!");
772cb7c8
JS		 2791 goto failed_mount2;
2792 }
2793
ac27a0ec
DK		 2794 sbi->s_gdb_count = db_count;
2795 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
2796 spin_lock_init(&sbi->s_next_gen_lock);
2797
833f4077
PZ		 2798 err = percpu_counter_init(&sbi->s_freeblocks_counter,
2799 ext4_count_free_blocks(sb));
2800 if (!err) {
2801 err = percpu_counter_init(&sbi->s_freeinodes_counter,
2802 ext4_count_free_inodes(sb));
2803 }
2804 if (!err) {
2805 err = percpu_counter_init(&sbi->s_dirs_counter,
2806 ext4_count_dirs(sb));
2807 }
6bc6e63f
AK		 2808 if (!err) {
2809 err = percpu_counter_init(&sbi->s_dirtyblocks_counter, 0);
2810 }
833f4077 2811 if (err) {
b31e1552 2812 ext4_msg(sb, KERN_ERR, "insufficient memory");
833f4077
PZ		 2813 goto failed_mount3;
2814 }
ac27a0ec 2815
c9de560d 2816 sbi->s_stripe = ext4_get_stripe_size(sbi);
55138e0b 2817 sbi->s_max_writeback_mb_bump = 128;
c9de560d 2818
ac27a0ec
DK		 2819 /*
2820 * set up enough so that it can read an inode
2821 */
9ca92389
TT		 2822 if (!test_opt(sb, NOLOAD) &&
2823 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
2824 sb->s_op = &ext4_sops;
2825 else
2826 sb->s_op = &ext4_nojournal_sops;
617ba13b
MC		 2827 sb->s_export_op = &ext4_export_ops;
2828 sb->s_xattr = ext4_xattr_handlers;
ac27a0ec 2829#ifdef CONFIG_QUOTA
617ba13b
MC		 2830 sb->s_qcop = &ext4_qctl_operations;
2831 sb->dq_op = &ext4_quota_operations;
ac27a0ec
DK		 2832#endif
2833 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
3b9d4ed2 2834 mutex_init(&sbi->s_orphan_lock);
32ed5058 2835 mutex_init(&sbi->s_resize_lock);
ac27a0ec
DK		 2836
2837 sb->s_root = NULL;
2838
2839 needs_recovery = (es->s_last_orphan != 0 ||
617ba13b
MC		 2840 EXT4_HAS_INCOMPAT_FEATURE(sb,
2841 EXT4_FEATURE_INCOMPAT_RECOVER));
ac27a0ec
DK		 2842
2843 /*
2844 * The first inode we look at is the journal inode. Don't try
2845 * root first: it may be modified in the journal!
2846 */
2847 if (!test_opt(sb, NOLOAD) &&
617ba13b
MC		 2848 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
2849 if (ext4_load_journal(sb, es, journal_devnum))
ac27a0ec 2850 goto failed_mount3;
0390131b
FM		 2851 } else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) &&
2852 EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
b31e1552
ES		 2853 ext4_msg(sb, KERN_ERR, "required journal recovery "
2854 "suppressed and not mounted read-only");
744692dc 2855 goto failed_mount_wq;
ac27a0ec 2856 } else {
0390131b
FM		 2857 clear_opt(sbi->s_mount_opt, DATA_FLAGS);
2858 set_opt(sbi->s_mount_opt, WRITEBACK_DATA);
2859 sbi->s_journal = NULL;
2860 needs_recovery = 0;
2861 goto no_journal;
ac27a0ec
DK		 2862 }
2863
eb40a09c
JS		 2864 if (ext4_blocks_count(es) > 0xffffffffULL &&
2865 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
2866 JBD2_FEATURE_INCOMPAT_64BIT)) {
b31e1552 2867 ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
744692dc 2868 goto failed_mount_wq;
eb40a09c
JS		 2869 }
2870
d4da6c9c
LT		 2871 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
2872 jbd2_journal_set_features(sbi->s_journal,
2873 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
818d276c 2874 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
d4da6c9c
LT		 2875 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
2876 jbd2_journal_set_features(sbi->s_journal,
2877 JBD2_FEATURE_COMPAT_CHECKSUM, 0, 0);
818d276c
GS		 2878 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
2879 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
d4da6c9c
LT		 2880 } else {
2881 jbd2_journal_clear_features(sbi->s_journal,
2882 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
2883 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2884 }
818d276c 2885
ac27a0ec
DK		 2886 /* We have now updated the journal if required, so we can
2887 * validate the data journaling mode. */
2888 switch (test_opt(sb, DATA_FLAGS)) {
2889 case 0:
2890 /* No mode set, assume a default based on the journal
63f57933
AM		 2891 * capabilities: ORDERED_DATA if the journal can
2892 * cope, else JOURNAL_DATA
2893 */
dab291af
MC		 2894 if (jbd2_journal_check_available_features
2895 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
ac27a0ec
DK		 2896 set_opt(sbi->s_mount_opt, ORDERED_DATA);
2897 else
2898 set_opt(sbi->s_mount_opt, JOURNAL_DATA);
2899 break;
2900
617ba13b
MC		 2901 case EXT4_MOUNT_ORDERED_DATA:
2902 case EXT4_MOUNT_WRITEBACK_DATA:
dab291af
MC		 2903 if (!jbd2_journal_check_available_features
2904 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
b31e1552
ES		 2905 ext4_msg(sb, KERN_ERR, "Journal does not support "
2906 "requested data journaling mode");
744692dc 2907 goto failed_mount_wq;
ac27a0ec
DK		 2908 }
2909 default:
2910 break;
2911 }
b3881f74 2912 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
ac27a0ec 2913
0390131b 2914no_journal:
ac27a0ec 2915 if (test_opt(sb, NOBH)) {
617ba13b 2916 if (!(test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)) {
b31e1552
ES		 2917 ext4_msg(sb, KERN_WARNING, "Ignoring nobh option - "
2918 "its supported only with writeback mode");
ac27a0ec
DK		 2919 clear_opt(sbi->s_mount_opt, NOBH);
2920 }
744692dc
JZ		 2921 if (test_opt(sb, DIOREAD_NOLOCK)) {
2922 ext4_msg(sb, KERN_WARNING, "dioread_nolock option is "
2923 "not supported with nobh mode");
2924 goto failed_mount_wq;
2925 }
ac27a0ec 2926 }
4c0425ff
MC		 2927 EXT4_SB(sb)->dio_unwritten_wq = create_workqueue("ext4-dio-unwritten");
2928 if (!EXT4_SB(sb)->dio_unwritten_wq) {
2929 printk(KERN_ERR "EXT4-fs: failed to create DIO workqueue\n");
2930 goto failed_mount_wq;
2931 }
2932
ac27a0ec 2933 /*
dab291af 2934 * The jbd2_journal_load will have done any necessary log recovery,
ac27a0ec
DK		 2935 * so we can safely mount the rest of the filesystem now.
2936 */
2937
1d1fe1ee
DH		 2938 root = ext4_iget(sb, EXT4_ROOT_INO);
2939 if (IS_ERR(root)) {
b31e1552 2940 ext4_msg(sb, KERN_ERR, "get root inode failed");
1d1fe1ee 2941 ret = PTR_ERR(root);
ac27a0ec
DK		 2942 goto failed_mount4;
2943 }
2944 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1d1fe1ee 2945 iput(root);
b31e1552 2946 ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
ac27a0ec
DK		 2947 goto failed_mount4;
2948 }
1d1fe1ee
DH		 2949 sb->s_root = d_alloc_root(root);
2950 if (!sb->s_root) {
b31e1552 2951 ext4_msg(sb, KERN_ERR, "get root dentry failed");
1d1fe1ee
DH		 2952 iput(root);
2953 ret = -ENOMEM;
2954 goto failed_mount4;
2955 }
ac27a0ec 2956
2b2d6d01 2957 ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY);
ef7f3835
KS		 2958
2959 /* determine the minimum size of new large inodes, if present */
2960 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
2961 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
2962 EXT4_GOOD_OLD_INODE_SIZE;
2963 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
2964 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) {
2965 if (sbi->s_want_extra_isize <
2966 le16_to_cpu(es->s_want_extra_isize))
2967 sbi->s_want_extra_isize =
2968 le16_to_cpu(es->s_want_extra_isize);
2969 if (sbi->s_want_extra_isize <
2970 le16_to_cpu(es->s_min_extra_isize))
2971 sbi->s_want_extra_isize =
2972 le16_to_cpu(es->s_min_extra_isize);
2973 }
2974 }
2975 /* Check if enough inode space is available */
2976 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
2977 sbi->s_inode_size) {
2978 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
2979 EXT4_GOOD_OLD_INODE_SIZE;
b31e1552
ES		 2980 ext4_msg(sb, KERN_INFO, "required extra inode space not"
2981 "available");
ef7f3835
KS		 2982 }
2983
90576c0b
TT		 2984 if (test_opt(sb, DELALLOC) &&
2985 (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)) {
b31e1552
ES		 2986 ext4_msg(sb, KERN_WARNING, "Ignoring delalloc option - "
2987 "requested data journaling mode");
c2774d84 2988 clear_opt(sbi->s_mount_opt, DELALLOC);
90576c0b 2989 }
744692dc
JZ		 2990 if (test_opt(sb, DIOREAD_NOLOCK)) {
2991 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
2992 ext4_msg(sb, KERN_WARNING, "Ignoring dioread_nolock "
2993 "option - requested data journaling mode");
2994 clear_opt(sbi->s_mount_opt, DIOREAD_NOLOCK);
2995 }
2996 if (sb->s_blocksize < PAGE_SIZE) {
2997 ext4_msg(sb, KERN_WARNING, "Ignoring dioread_nolock "
2998 "option - block size is too small");
2999 clear_opt(sbi->s_mount_opt, DIOREAD_NOLOCK);
3000 }
3001 }
c2774d84 3002
6fd058f7
TT		 3003 err = ext4_setup_system_zone(sb);
3004 if (err) {
b31e1552
ES		 3005 ext4_msg(sb, KERN_ERR, "failed to initialize system "
3006 "zone (%d)\n", err);
6fd058f7
TT		 3007 goto failed_mount4;
3008 }
3009
c2774d84
AK		 3010 ext4_ext_init(sb);
3011 err = ext4_mb_init(sb, needs_recovery);
3012 if (err) {
b31e1552
ES		 3013 ext4_msg(sb, KERN_ERR, "failed to initalize mballoc (%d)",
3014 err);
c2774d84
AK		 3015 goto failed_mount4;
3016 }
3017
3197ebdb
TT		 3018 sbi->s_kobj.kset = ext4_kset;
3019 init_completion(&sbi->s_kobj_unregister);
3020 err = kobject_init_and_add(&sbi->s_kobj, &ext4_ktype, NULL,
3021 "%s", sb->s_id);
3022 if (err) {
3023 ext4_mb_release(sb);
3024 ext4_ext_release(sb);
3025 goto failed_mount4;
3026 };
3027
617ba13b
MC		 3028 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
3029 ext4_orphan_cleanup(sb, es);
3030 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
0390131b 3031 if (needs_recovery) {
b31e1552 3032 ext4_msg(sb, KERN_INFO, "recovery complete");
0390131b
FM		 3033 ext4_mark_recovery_complete(sb, es);
3034 }
3035 if (EXT4_SB(sb)->s_journal) {
3036 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
3037 descr = " journalled data mode";
3038 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
3039 descr = " ordered data mode";
3040 else
3041 descr = " writeback data mode";
3042 } else
3043 descr = "out journal";
3044
b31e1552 3045 ext4_msg(sb, KERN_INFO, "mounted filesystem with%s", descr);
ac27a0ec
DK		 3046
3047 lock_kernel();
3048 return 0;
3049
617ba13b 3050cantfind_ext4:
ac27a0ec 3051 if (!silent)
b31e1552 3052 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
ac27a0ec
DK		 3053 goto failed_mount;
3054
3055failed_mount4:
b31e1552 3056 ext4_msg(sb, KERN_ERR, "mount failed");
4c0425ff
MC		 3057 destroy_workqueue(EXT4_SB(sb)->dio_unwritten_wq);
3058failed_mount_wq:
6fd058f7 3059 ext4_release_system_zone(sb);
0390131b
FM		 3060 if (sbi->s_journal) {
3061 jbd2_journal_destroy(sbi->s_journal);
3062 sbi->s_journal = NULL;
3063 }
ac27a0ec 3064failed_mount3:
c5ca7c76
TT		 3065 if (sbi->s_flex_groups) {
3066 if (is_vmalloc_addr(sbi->s_flex_groups))
3067 vfree(sbi->s_flex_groups);
3068 else
3069 kfree(sbi->s_flex_groups);
3070 }
ac27a0ec
DK		 3071 percpu_counter_destroy(&sbi->s_freeblocks_counter);
3072 percpu_counter_destroy(&sbi->s_freeinodes_counter);
3073 percpu_counter_destroy(&sbi->s_dirs_counter);
6bc6e63f 3074 percpu_counter_destroy(&sbi->s_dirtyblocks_counter);
ac27a0ec
DK		 3075failed_mount2:
3076 for (i = 0; i < db_count; i++)
3077 brelse(sbi->s_group_desc[i]);
3078 kfree(sbi->s_group_desc);
3079failed_mount:
240799cd 3080 if (sbi->s_proc) {
9f6200bb 3081 remove_proc_entry(sb->s_id, ext4_proc_root);
240799cd 3082 }
ac27a0ec
DK		 3083#ifdef CONFIG_QUOTA
3084 for (i = 0; i < MAXQUOTAS; i++)
3085 kfree(sbi->s_qf_names[i]);
3086#endif
617ba13b 3087 ext4_blkdev_remove(sbi);
ac27a0ec
DK		 3088 brelse(bh);
3089out_fail:
3090 sb->s_fs_info = NULL;
f6830165 3091 kfree(sbi->s_blockgroup_lock);
ac27a0ec
DK		 3092 kfree(sbi);
3093 lock_kernel();
1d1fe1ee 3094 return ret;
ac27a0ec
DK		 3095}
3096
3097/*
3098 * Setup any per-fs journal parameters now. We'll do this both on
3099 * initial mount, once the journal has been initialised but before we've
3100 * done any recovery; and again on any subsequent remount.
3101 */
617ba13b 3102static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
ac27a0ec 3103{
617ba13b 3104 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 3105
30773840
TT		 3106 journal->j_commit_interval = sbi->s_commit_interval;
3107 journal->j_min_batch_time = sbi->s_min_batch_time;
3108 journal->j_max_batch_time = sbi->s_max_batch_time;
ac27a0ec
DK		 3109
3110 spin_lock(&journal->j_state_lock);
3111 if (test_opt(sb, BARRIER))
dab291af 3112 journal->j_flags |= JBD2_BARRIER;
ac27a0ec 3113 else
dab291af 3114 journal->j_flags &= ~JBD2_BARRIER;
5bf5683a
HK		 3115 if (test_opt(sb, DATA_ERR_ABORT))
3116 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
3117 else
3118 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
ac27a0ec
DK		 3119 spin_unlock(&journal->j_state_lock);
3120}
3121
617ba13b 3122static journal_t *ext4_get_journal(struct super_block *sb,
ac27a0ec
DK		 3123 unsigned int journal_inum)
3124{
3125 struct inode *journal_inode;
3126 journal_t *journal;
3127
0390131b
FM		 3128 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3129
ac27a0ec
DK		 3130 /* First, test for the existence of a valid inode on disk. Bad
3131 * things happen if we iget() an unused inode, as the subsequent
3132 * iput() will try to delete it. */
3133
1d1fe1ee
DH		 3134 journal_inode = ext4_iget(sb, journal_inum);
3135 if (IS_ERR(journal_inode)) {
b31e1552 3136 ext4_msg(sb, KERN_ERR, "no journal found");
ac27a0ec
DK		 3137 return NULL;
3138 }
3139 if (!journal_inode->i_nlink) {
3140 make_bad_inode(journal_inode);
3141 iput(journal_inode);
b31e1552 3142 ext4_msg(sb, KERN_ERR, "journal inode is deleted");
ac27a0ec
DK		 3143 return NULL;
3144 }
3145
e5f8eab8 3146 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
ac27a0ec 3147 journal_inode, journal_inode->i_size);
1d1fe1ee 3148 if (!S_ISREG(journal_inode->i_mode)) {
b31e1552 3149 ext4_msg(sb, KERN_ERR, "invalid journal inode");
ac27a0ec
DK		 3150 iput(journal_inode);
3151 return NULL;
3152 }
3153
dab291af 3154 journal = jbd2_journal_init_inode(journal_inode);
ac27a0ec 3155 if (!journal) {
b31e1552 3156 ext4_msg(sb, KERN_ERR, "Could not load journal inode");
ac27a0ec
DK		 3157 iput(journal_inode);
3158 return NULL;
3159 }
3160 journal->j_private = sb;
617ba13b 3161 ext4_init_journal_params(sb, journal);
ac27a0ec
DK		 3162 return journal;
3163}
3164
617ba13b 3165static journal_t *ext4_get_dev_journal(struct super_block *sb,
ac27a0ec
DK		 3166 dev_t j_dev)
3167{
2b2d6d01 3168 struct buffer_head *bh;
ac27a0ec 3169 journal_t *journal;
617ba13b
MC		 3170 ext4_fsblk_t start;
3171 ext4_fsblk_t len;
ac27a0ec 3172 int hblock, blocksize;
617ba13b 3173 ext4_fsblk_t sb_block;
ac27a0ec 3174 unsigned long offset;
2b2d6d01 3175 struct ext4_super_block *es;
ac27a0ec
DK		 3176 struct block_device *bdev;
3177
0390131b
FM		 3178 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3179
b31e1552 3180 bdev = ext4_blkdev_get(j_dev, sb);
ac27a0ec
DK		 3181 if (bdev == NULL)
3182 return NULL;
3183
3184 if (bd_claim(bdev, sb)) {
b31e1552
ES		 3185 ext4_msg(sb, KERN_ERR,
3186 "failed to claim external journal device");
9a1c3542 3187 blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
ac27a0ec
DK		 3188 return NULL;
3189 }
3190
3191 blocksize = sb->s_blocksize;
e1defc4f 3192 hblock = bdev_logical_block_size(bdev);
ac27a0ec 3193 if (blocksize < hblock) {
b31e1552
ES		 3194 ext4_msg(sb, KERN_ERR,
3195 "blocksize too small for journal device");
ac27a0ec
DK		 3196 goto out_bdev;
3197 }
3198
617ba13b
MC		 3199 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
3200 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
ac27a0ec
DK		 3201 set_blocksize(bdev, blocksize);
3202 if (!(bh = __bread(bdev, sb_block, blocksize))) {
b31e1552
ES		 3203 ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
3204 "external journal");
ac27a0ec
DK		 3205 goto out_bdev;
3206 }
3207
617ba13b
MC		 3208 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
3209 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
ac27a0ec 3210 !(le32_to_cpu(es->s_feature_incompat) &
617ba13b 3211 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
b31e1552
ES		 3212 ext4_msg(sb, KERN_ERR, "external journal has "
3213 "bad superblock");
ac27a0ec
DK		 3214 brelse(bh);
3215 goto out_bdev;
3216 }
3217
617ba13b 3218 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
b31e1552 3219 ext4_msg(sb, KERN_ERR, "journal UUID does not match");
ac27a0ec
DK		 3220 brelse(bh);
3221 goto out_bdev;
3222 }
3223
bd81d8ee 3224 len = ext4_blocks_count(es);
ac27a0ec
DK		 3225 start = sb_block + 1;
3226 brelse(bh); /* we're done with the superblock */
3227
dab291af 3228 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
ac27a0ec
DK		 3229 start, len, blocksize);
3230 if (!journal) {
b31e1552 3231 ext4_msg(sb, KERN_ERR, "failed to create device journal");
ac27a0ec
DK		 3232 goto out_bdev;
3233 }
3234 journal->j_private = sb;
3235 ll_rw_block(READ, 1, &journal->j_sb_buffer);
3236 wait_on_buffer(journal->j_sb_buffer);
3237 if (!buffer_uptodate(journal->j_sb_buffer)) {
b31e1552 3238 ext4_msg(sb, KERN_ERR, "I/O error on journal device");
ac27a0ec
DK		 3239 goto out_journal;
3240 }
3241 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
b31e1552
ES		 3242 ext4_msg(sb, KERN_ERR, "External journal has more than one "
3243 "user (unsupported) - %d",
ac27a0ec
DK		 3244 be32_to_cpu(journal->j_superblock->s_nr_users));
3245 goto out_journal;
3246 }
617ba13b
MC		 3247 EXT4_SB(sb)->journal_bdev = bdev;
3248 ext4_init_journal_params(sb, journal);
ac27a0ec 3249 return journal;
0b8e58a1 3250
ac27a0ec 3251out_journal:
dab291af 3252 jbd2_journal_destroy(journal);
ac27a0ec 3253out_bdev:
617ba13b 3254 ext4_blkdev_put(bdev);
ac27a0ec
DK		 3255 return NULL;
3256}
3257
617ba13b
MC		 3258static int ext4_load_journal(struct super_block *sb,
3259 struct ext4_super_block *es,
ac27a0ec
DK		 3260 unsigned long journal_devnum)
3261{
3262 journal_t *journal;
3263 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
3264 dev_t journal_dev;
3265 int err = 0;
3266 int really_read_only;
3267
0390131b
FM		 3268 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3269
ac27a0ec
DK		 3270 if (journal_devnum &&
3271 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
b31e1552
ES		 3272 ext4_msg(sb, KERN_INFO, "external journal device major/minor "
3273 "numbers have changed");
ac27a0ec
DK		 3274 journal_dev = new_decode_dev(journal_devnum);
3275 } else
3276 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
3277
3278 really_read_only = bdev_read_only(sb->s_bdev);
3279
3280 /*
3281 * Are we loading a blank journal or performing recovery after a
3282 * crash? For recovery, we need to check in advance whether we
3283 * can get read-write access to the device.
3284 */
617ba13b 3285 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
ac27a0ec 3286 if (sb->s_flags & MS_RDONLY) {
b31e1552
ES		 3287 ext4_msg(sb, KERN_INFO, "INFO: recovery "
3288 "required on readonly filesystem");
ac27a0ec 3289 if (really_read_only) {
b31e1552
ES		 3290 ext4_msg(sb, KERN_ERR, "write access "
3291 "unavailable, cannot proceed");
ac27a0ec
DK		 3292 return -EROFS;
3293 }
b31e1552
ES		 3294 ext4_msg(sb, KERN_INFO, "write access will "
3295 "be enabled during recovery");
ac27a0ec
DK		 3296 }
3297 }
3298
3299 if (journal_inum && journal_dev) {
b31e1552
ES		 3300 ext4_msg(sb, KERN_ERR, "filesystem has both journal "
3301 "and inode journals!");
ac27a0ec
DK		 3302 return -EINVAL;
3303 }
3304
3305 if (journal_inum) {
617ba13b 3306 if (!(journal = ext4_get_journal(sb, journal_inum)))
ac27a0ec
DK		 3307 return -EINVAL;
3308 } else {
617ba13b 3309 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
ac27a0ec
DK		 3310 return -EINVAL;
3311 }
3312
90576c0b 3313 if (!(journal->j_flags & JBD2_BARRIER))
b31e1552 3314 ext4_msg(sb, KERN_INFO, "barriers disabled");
4776004f 3315
ac27a0ec 3316 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
dab291af 3317 err = jbd2_journal_update_format(journal);
ac27a0ec 3318 if (err) {
b31e1552 3319 ext4_msg(sb, KERN_ERR, "error updating journal");
dab291af 3320 jbd2_journal_destroy(journal);
ac27a0ec
DK		 3321 return err;
3322 }
3323 }
3324
617ba13b 3325 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
dab291af 3326 err = jbd2_journal_wipe(journal, !really_read_only);
ac27a0ec 3327 if (!err)
dab291af 3328 err = jbd2_journal_load(journal);
ac27a0ec
DK		 3329
3330 if (err) {
b31e1552 3331 ext4_msg(sb, KERN_ERR, "error loading journal");
dab291af 3332 jbd2_journal_destroy(journal);
ac27a0ec
DK		 3333 return err;
3334 }
3335
617ba13b
MC		 3336 EXT4_SB(sb)->s_journal = journal;
3337 ext4_clear_journal_err(sb, es);
ac27a0ec
DK		 3338
3339 if (journal_devnum &&
3340 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
3341 es->s_journal_dev = cpu_to_le32(journal_devnum);
ac27a0ec
DK		 3342
3343 /* Make sure we flush the recovery flag to disk. */
e2d67052 3344 ext4_commit_super(sb, 1);
ac27a0ec
DK		 3345 }
3346
3347 return 0;
3348}
3349
e2d67052 3350static int ext4_commit_super(struct super_block *sb, int sync)
ac27a0ec 3351{
e2d67052 3352 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
617ba13b 3353 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
c4be0c1d 3354 int error = 0;
ac27a0ec
DK		 3355
3356 if (!sbh)
c4be0c1d 3357 return error;
914258bf
TT		 3358 if (buffer_write_io_error(sbh)) {
3359 /*
3360 * Oh, dear. A previous attempt to write the
3361 * superblock failed. This could happen because the
3362 * USB device was yanked out. Or it could happen to
3363 * be a transient write error and maybe the block will
3364 * be remapped. Nothing we can do but to retry the
3365 * write and hope for the best.
3366 */
b31e1552
ES		 3367 ext4_msg(sb, KERN_ERR, "previous I/O error to "
3368 "superblock detected");
914258bf
TT		 3369 clear_buffer_write_io_error(sbh);
3370 set_buffer_uptodate(sbh);
3371 }
71290b36
TT		 3372 /*
3373 * If the file system is mounted read-only, don't update the
3374 * superblock write time. This avoids updating the superblock
3375 * write time when we are mounting the root file system
3376 * read/only but we need to replay the journal; at that point,
3377 * for people who are east of GMT and who make their clock
3378 * tick in localtime for Windows bug-for-bug compatibility,
3379 * the clock is set in the future, and this will cause e2fsck
3380 * to complain and force a full file system check.
3381 */
3382 if (!(sb->s_flags & MS_RDONLY))
3383 es->s_wtime = cpu_to_le32(get_seconds());
afc32f7e
TT		 3384 es->s_kbytes_written =
3385 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written +
3386 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
3387 EXT4_SB(sb)->s_sectors_written_start) >> 1));
5d1b1b3f
AK		 3388 ext4_free_blocks_count_set(es, percpu_counter_sum_positive(
3389 &EXT4_SB(sb)->s_freeblocks_counter));
3390 es->s_free_inodes_count = cpu_to_le32(percpu_counter_sum_positive(
3391 &EXT4_SB(sb)->s_freeinodes_counter));
7234ab2a 3392 sb->s_dirt = 0;
ac27a0ec
DK		 3393 BUFFER_TRACE(sbh, "marking dirty");
3394 mark_buffer_dirty(sbh);
914258bf 3395 if (sync) {
c4be0c1d
TS		 3396 error = sync_dirty_buffer(sbh);
3397 if (error)
3398 return error;
3399
3400 error = buffer_write_io_error(sbh);
3401 if (error) {
b31e1552
ES		 3402 ext4_msg(sb, KERN_ERR, "I/O error while writing "
3403 "superblock");
914258bf
TT		 3404 clear_buffer_write_io_error(sbh);
3405 set_buffer_uptodate(sbh);
3406 }
3407 }
c4be0c1d 3408 return error;
ac27a0ec
DK		 3409}
3410
ac27a0ec
DK		 3411/*
3412 * Have we just finished recovery? If so, and if we are mounting (or
3413 * remounting) the filesystem readonly, then we will end up with a
3414 * consistent fs on disk. Record that fact.
3415 */
2b2d6d01
TT		 3416static void ext4_mark_recovery_complete(struct super_block *sb,
3417 struct ext4_super_block *es)
ac27a0ec 3418{
617ba13b 3419 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 3420
0390131b
FM		 3421 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
3422 BUG_ON(journal != NULL);
3423 return;
3424 }
dab291af 3425 jbd2_journal_lock_updates(journal);
7ffe1ea8
HK		 3426 if (jbd2_journal_flush(journal) < 0)
3427 goto out;
3428
617ba13b 3429 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
ac27a0ec 3430 sb->s_flags & MS_RDONLY) {
617ba13b 3431 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
e2d67052 3432 ext4_commit_super(sb, 1);
ac27a0ec 3433 }
7ffe1ea8
HK		 3434
3435out:
dab291af 3436 jbd2_journal_unlock_updates(journal);
ac27a0ec
DK		 3437}
3438
3439/*
3440 * If we are mounting (or read-write remounting) a filesystem whose journal
3441 * has recorded an error from a previous lifetime, move that error to the
3442 * main filesystem now.
3443 */
2b2d6d01
TT		 3444static void ext4_clear_journal_err(struct super_block *sb,
3445 struct ext4_super_block *es)
ac27a0ec
DK		 3446{
3447 journal_t *journal;
3448 int j_errno;
3449 const char *errstr;
3450
0390131b
FM		 3451 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3452
617ba13b 3453 journal = EXT4_SB(sb)->s_journal;
ac27a0ec
DK		 3454
3455 /*
3456 * Now check for any error status which may have been recorded in the
617ba13b 3457 * journal by a prior ext4_error() or ext4_abort()
ac27a0ec
DK		 3458 */
3459
dab291af 3460 j_errno = jbd2_journal_errno(journal);
ac27a0ec
DK		 3461 if (j_errno) {
3462 char nbuf[16];
3463
617ba13b 3464 errstr = ext4_decode_error(sb, j_errno, nbuf);
12062ddd 3465 ext4_warning(sb, "Filesystem error recorded "
ac27a0ec 3466 "from previous mount: %s", errstr);
12062ddd 3467 ext4_warning(sb, "Marking fs in need of filesystem check.");
ac27a0ec 3468
617ba13b
MC		 3469 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
3470 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
e2d67052 3471 ext4_commit_super(sb, 1);
ac27a0ec 3472
dab291af 3473 jbd2_journal_clear_err(journal);
ac27a0ec
DK		 3474 }
3475}
3476
3477/*
3478 * Force the running and committing transactions to commit,
3479 * and wait on the commit.
3480 */
617ba13b 3481int ext4_force_commit(struct super_block *sb)
ac27a0ec
DK		 3482{
3483 journal_t *journal;
0390131b 3484 int ret = 0;
ac27a0ec
DK		 3485
3486 if (sb->s_flags & MS_RDONLY)
3487 return 0;
3488
617ba13b 3489 journal = EXT4_SB(sb)->s_journal;
7234ab2a 3490 if (journal)
0390131b 3491 ret = ext4_journal_force_commit(journal);
0390131b 3492
ac27a0ec
DK		 3493 return ret;
3494}
3495
2b2d6d01 3496static void ext4_write_super(struct super_block *sb)
ac27a0ec 3497{
ebc1ac16 3498 lock_super(sb);
9ca92389 3499 ext4_commit_super(sb, 1);
ebc1ac16 3500 unlock_super(sb);
ac27a0ec
DK		 3501}
3502
617ba13b 3503static int ext4_sync_fs(struct super_block *sb, int wait)
ac27a0ec 3504{
14ce0cb4 3505 int ret = 0;
9eddacf9 3506 tid_t target;
8d5d02e6 3507 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 3508
9bffad1e 3509 trace_ext4_sync_fs(sb, wait);
8d5d02e6
MC		 3510 flush_workqueue(sbi->dio_unwritten_wq);
3511 if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
9ca92389 3512 if (wait)
8d5d02e6 3513 jbd2_log_wait_commit(sbi->s_journal, target);
0390131b 3514 }
14ce0cb4 3515 return ret;
ac27a0ec
DK		 3516}
3517
3518/*
3519 * LVM calls this function before a (read-only) snapshot is created. This
3520 * gives us a chance to flush the journal completely and mark the fs clean.
3521 */
c4be0c1d 3522static int ext4_freeze(struct super_block *sb)
ac27a0ec 3523{
c4be0c1d
TS		 3524 int error = 0;
3525 journal_t *journal;
ac27a0ec 3526
9ca92389
TT		 3527 if (sb->s_flags & MS_RDONLY)
3528 return 0;
ac27a0ec 3529
9ca92389 3530 journal = EXT4_SB(sb)->s_journal;
7ffe1ea8 3531
9ca92389
TT		 3532 /* Now we set up the journal barrier. */
3533 jbd2_journal_lock_updates(journal);
ac27a0ec 3534
9ca92389
TT		 3535 /*
3536 * Don't clear the needs_recovery flag if we failed to flush
3537 * the journal.
3538 */
3539 error = jbd2_journal_flush(journal);
3540 if (error < 0) {
3541 out:
3542 jbd2_journal_unlock_updates(journal);
3543 return error;
ac27a0ec 3544 }
9ca92389
TT		 3545
3546 /* Journal blocked and flushed, clear needs_recovery flag. */
3547 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
3548 error = ext4_commit_super(sb, 1);
3549 if (error)
3550 goto out;
c4be0c1d 3551 return 0;
ac27a0ec
DK		 3552}
3553
3554/*
3555 * Called by LVM after the snapshot is done. We need to reset the RECOVER
3556 * flag here, even though the filesystem is not technically dirty yet.
3557 */
c4be0c1d 3558static int ext4_unfreeze(struct super_block *sb)
ac27a0ec 3559{
9ca92389
TT		 3560 if (sb->s_flags & MS_RDONLY)
3561 return 0;
3562
3563 lock_super(sb);
3564 /* Reset the needs_recovery flag before the fs is unlocked. */
3565 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
3566 ext4_commit_super(sb, 1);
3567 unlock_super(sb);
3568 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
c4be0c1d 3569 return 0;
ac27a0ec
DK		 3570}
3571
2b2d6d01 3572static int ext4_remount(struct super_block *sb, int *flags, char *data)
ac27a0ec 3573{
2b2d6d01 3574 struct ext4_super_block *es;
617ba13b
MC		 3575 struct ext4_sb_info *sbi = EXT4_SB(sb);
3576 ext4_fsblk_t n_blocks_count = 0;
ac27a0ec 3577 unsigned long old_sb_flags;
617ba13b 3578 struct ext4_mount_options old_opts;
c79d967d 3579 int enable_quota = 0;
8a266467 3580 ext4_group_t g;
b3881f74 3581 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
ac27a0ec
DK		 3582 int err;
3583#ifdef CONFIG_QUOTA
3584 int i;
3585#endif
3586
337eb00a
AIB		 3587 lock_kernel();
3588
ac27a0ec 3589 /* Store the original options */
bbd6851a 3590 lock_super(sb);
ac27a0ec
DK		 3591 old_sb_flags = sb->s_flags;
3592 old_opts.s_mount_opt = sbi->s_mount_opt;
3593 old_opts.s_resuid = sbi->s_resuid;
3594 old_opts.s_resgid = sbi->s_resgid;
3595 old_opts.s_commit_interval = sbi->s_commit_interval;
30773840
TT		 3596 old_opts.s_min_batch_time = sbi->s_min_batch_time;
3597 old_opts.s_max_batch_time = sbi->s_max_batch_time;
ac27a0ec
DK		 3598#ifdef CONFIG_QUOTA
3599 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
3600 for (i = 0; i < MAXQUOTAS; i++)
3601 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
3602#endif
b3881f74
TT		 3603 if (sbi->s_journal && sbi->s_journal->j_task->io_context)
3604 journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
ac27a0ec
DK		 3605
3606 /*
3607 * Allow the "check" option to be passed as a remount option.
3608 */
b3881f74
TT		 3609 if (!parse_options(data, sb, NULL, &journal_ioprio,
3610 &n_blocks_count, 1)) {
ac27a0ec
DK		 3611 err = -EINVAL;
3612 goto restore_opts;
3613 }
3614
4ab2f15b 3615 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
46e665e9 3616 ext4_abort(sb, __func__, "Abort forced by user");
ac27a0ec
DK		 3617
3618 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
482a7425 3619 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec
DK		 3620
3621 es = sbi->s_es;
3622
b3881f74 3623 if (sbi->s_journal) {
0390131b 3624 ext4_init_journal_params(sb, sbi->s_journal);
b3881f74
TT		 3625 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
3626 }
ac27a0ec
DK		 3627
3628 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
bd81d8ee 3629 n_blocks_count > ext4_blocks_count(es)) {
4ab2f15b 3630 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) {
ac27a0ec
DK		 3631 err = -EROFS;
3632 goto restore_opts;
3633 }
3634
3635 if (*flags & MS_RDONLY) {
0f0dd62f
CH		 3636 err = dquot_suspend(sb, -1);
3637 if (err < 0)
c79d967d 3638 goto restore_opts;
c79d967d 3639
ac27a0ec
DK		 3640 /*
3641 * First of all, the unconditional stuff we have to do
3642 * to disable replay of the journal when we next remount
3643 */
3644 sb->s_flags |= MS_RDONLY;
3645
3646 /*
3647 * OK, test if we are remounting a valid rw partition
3648 * readonly, and if so set the rdonly flag and then
3649 * mark the partition as valid again.
3650 */
617ba13b
MC		 3651 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
3652 (sbi->s_mount_state & EXT4_VALID_FS))
ac27a0ec
DK		 3653 es->s_state = cpu_to_le16(sbi->s_mount_state);
3654
a63c9eb2 3655 if (sbi->s_journal)
0390131b 3656 ext4_mark_recovery_complete(sb, es);
ac27a0ec 3657 } else {
a13fb1a4
ES		 3658 /* Make sure we can mount this feature set readwrite */
3659 if (!ext4_feature_set_ok(sb, 0)) {
ac27a0ec
DK		 3660 err = -EROFS;
3661 goto restore_opts;
3662 }
8a266467
TT		 3663 /*
3664 * Make sure the group descriptor checksums
0b8e58a1 3665 * are sane. If they aren't, refuse to remount r/w.
8a266467
TT		 3666 */
3667 for (g = 0; g < sbi->s_groups_count; g++) {
3668 struct ext4_group_desc *gdp =
3669 ext4_get_group_desc(sb, g, NULL);
3670
3671 if (!ext4_group_desc_csum_verify(sbi, g, gdp)) {
b31e1552
ES		 3672 ext4_msg(sb, KERN_ERR,
3673 "ext4_remount: Checksum for group %u failed (%u!=%u)",
8a266467
TT		 3674 g, le16_to_cpu(ext4_group_desc_csum(sbi, g, gdp)),
3675 le16_to_cpu(gdp->bg_checksum));
3676 err = -EINVAL;
3677 goto restore_opts;
3678 }
3679 }
3680
ead6596b
ES		 3681 /*
3682 * If we have an unprocessed orphan list hanging
3683 * around from a previously readonly bdev mount,
3684 * require a full umount/remount for now.
3685 */
3686 if (es->s_last_orphan) {
b31e1552 3687 ext4_msg(sb, KERN_WARNING, "Couldn't "
ead6596b
ES		 3688 "remount RDWR because of unprocessed "
3689 "orphan inode list. Please "
b31e1552 3690 "umount/remount instead");
ead6596b
ES		 3691 err = -EINVAL;
3692 goto restore_opts;
3693 }
3694
ac27a0ec
DK		 3695 /*
3696 * Mounting a RDONLY partition read-write, so reread
3697 * and store the current valid flag. (It may have
3698 * been changed by e2fsck since we originally mounted
3699 * the partition.)
3700 */
0390131b
FM		 3701 if (sbi->s_journal)
3702 ext4_clear_journal_err(sb, es);
ac27a0ec 3703 sbi->s_mount_state = le16_to_cpu(es->s_state);
617ba13b 3704 if ((err = ext4_group_extend(sb, es, n_blocks_count)))
ac27a0ec 3705 goto restore_opts;
2b2d6d01 3706 if (!ext4_setup_super(sb, es, 0))
ac27a0ec 3707 sb->s_flags &= ~MS_RDONLY;
c79d967d 3708 enable_quota = 1;
ac27a0ec
DK		 3709 }
3710 }
6fd058f7 3711 ext4_setup_system_zone(sb);
0390131b 3712 if (sbi->s_journal == NULL)
e2d67052 3713 ext4_commit_super(sb, 1);
0390131b 3714
ac27a0ec
DK		 3715#ifdef CONFIG_QUOTA
3716 /* Release old quota file names */
3717 for (i = 0; i < MAXQUOTAS; i++)
3718 if (old_opts.s_qf_names[i] &&
3719 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
3720 kfree(old_opts.s_qf_names[i]);
3721#endif
bbd6851a 3722 unlock_super(sb);
337eb00a 3723 unlock_kernel();
c79d967d 3724 if (enable_quota)
0f0dd62f 3725 dquot_resume(sb, -1);
ac27a0ec 3726 return 0;
0b8e58a1 3727
ac27a0ec
DK		 3728restore_opts:
3729 sb->s_flags = old_sb_flags;
3730 sbi->s_mount_opt = old_opts.s_mount_opt;
3731 sbi->s_resuid = old_opts.s_resuid;
3732 sbi->s_resgid = old_opts.s_resgid;
3733 sbi->s_commit_interval = old_opts.s_commit_interval;
30773840
TT		 3734 sbi->s_min_batch_time = old_opts.s_min_batch_time;
3735 sbi->s_max_batch_time = old_opts.s_max_batch_time;
ac27a0ec
DK		 3736#ifdef CONFIG_QUOTA
3737 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
3738 for (i = 0; i < MAXQUOTAS; i++) {
3739 if (sbi->s_qf_names[i] &&
3740 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
3741 kfree(sbi->s_qf_names[i]);
3742 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
3743 }
3744#endif
bbd6851a 3745 unlock_super(sb);
337eb00a 3746 unlock_kernel();
ac27a0ec
DK		 3747 return err;
3748}
3749
2b2d6d01 3750static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
ac27a0ec
DK		 3751{
3752 struct super_block *sb = dentry->d_sb;
617ba13b
MC		 3753 struct ext4_sb_info *sbi = EXT4_SB(sb);
3754 struct ext4_super_block *es = sbi->s_es;
960cc398 3755 u64 fsid;
ac27a0ec 3756
5e70030d
BP		 3757 if (test_opt(sb, MINIX_DF)) {
3758 sbi->s_overhead_last = 0;
6bc9feff 3759 } else if (sbi->s_blocks_last != ext4_blocks_count(es)) {
8df9675f 3760 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
5e70030d 3761 ext4_fsblk_t overhead = 0;
ac27a0ec
DK		 3762
3763 /*
5e70030d
BP		 3764 * Compute the overhead (FS structures). This is constant
3765 * for a given filesystem unless the number of block groups
3766 * changes so we cache the previous value until it does.
ac27a0ec
DK		 3767 */
3768
3769 /*
3770 * All of the blocks before first_data_block are
3771 * overhead
3772 */
3773 overhead = le32_to_cpu(es->s_first_data_block);
3774
3775 /*
3776 * Add the overhead attributed to the superblock and
3777 * block group descriptors. If the sparse superblocks
3778 * feature is turned on, then not all groups have this.
3779 */
3780 for (i = 0; i < ngroups; i++) {
617ba13b
MC		 3781 overhead += ext4_bg_has_super(sb, i) +
3782 ext4_bg_num_gdb(sb, i);
ac27a0ec
DK		 3783 cond_resched();
3784 }
3785
3786 /*
3787 * Every block group has an inode bitmap, a block
3788 * bitmap, and an inode table.
3789 */
5e70030d
BP		 3790 overhead += ngroups * (2 + sbi->s_itb_per_group);
3791 sbi->s_overhead_last = overhead;
3792 smp_wmb();
6bc9feff 3793 sbi->s_blocks_last = ext4_blocks_count(es);
ac27a0ec
DK		 3794 }
3795
617ba13b 3796 buf->f_type = EXT4_SUPER_MAGIC;
ac27a0ec 3797 buf->f_bsize = sb->s_blocksize;
5e70030d 3798 buf->f_blocks = ext4_blocks_count(es) - sbi->s_overhead_last;
6bc6e63f
AK		 3799 buf->f_bfree = percpu_counter_sum_positive(&sbi->s_freeblocks_counter) -
3800 percpu_counter_sum_positive(&sbi->s_dirtyblocks_counter);
bd81d8ee
LV		 3801 buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es);
3802 if (buf->f_bfree < ext4_r_blocks_count(es))
ac27a0ec
DK		 3803 buf->f_bavail = 0;
3804 buf->f_files = le32_to_cpu(es->s_inodes_count);
52d9f3b4 3805 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
617ba13b 3806 buf->f_namelen = EXT4_NAME_LEN;
960cc398
PE		 3807 fsid = le64_to_cpup((void *)es->s_uuid) ^
3808 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
3809 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
3810 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
0b8e58a1 3811
ac27a0ec
DK		 3812 return 0;
3813}
3814
0b8e58a1
AD		 3815/* Helper function for writing quotas on sync - we need to start transaction
3816 * before quota file is locked for write. Otherwise the are possible deadlocks:
ac27a0ec 3817 * Process 1 Process 2
617ba13b 3818 * ext4_create() quota_sync()
a269eb18 3819 * jbd2_journal_start() write_dquot()
871a2931 3820 * dquot_initialize() down(dqio_mutex)
dab291af 3821 * down(dqio_mutex) jbd2_journal_start()
ac27a0ec
DK		 3822 *
3823 */
3824
3825#ifdef CONFIG_QUOTA
3826
3827static inline struct inode *dquot_to_inode(struct dquot *dquot)
3828{
3829 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
3830}
3831
617ba13b 3832static int ext4_write_dquot(struct dquot *dquot)
ac27a0ec
DK		 3833{
3834 int ret, err;
3835 handle_t *handle;
3836 struct inode *inode;
3837
3838 inode = dquot_to_inode(dquot);
617ba13b 3839 handle = ext4_journal_start(inode,
0b8e58a1 3840 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 3841 if (IS_ERR(handle))
3842 return PTR_ERR(handle);
3843 ret = dquot_commit(dquot);
617ba13b 3844 err = ext4_journal_stop(handle);
ac27a0ec
DK		 3845 if (!ret)
3846 ret = err;
3847 return ret;
3848}
3849
617ba13b 3850static int ext4_acquire_dquot(struct dquot *dquot)
ac27a0ec
DK		 3851{
3852 int ret, err;
3853 handle_t *handle;
3854
617ba13b 3855 handle = ext4_journal_start(dquot_to_inode(dquot),
0b8e58a1 3856 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 3857 if (IS_ERR(handle))
3858 return PTR_ERR(handle);
3859 ret = dquot_acquire(dquot);
617ba13b 3860 err = ext4_journal_stop(handle);
ac27a0ec
DK		 3861 if (!ret)
3862 ret = err;
3863 return ret;
3864}
3865
617ba13b 3866static int ext4_release_dquot(struct dquot *dquot)
ac27a0ec
DK		 3867{
3868 int ret, err;
3869 handle_t *handle;
3870
617ba13b 3871 handle = ext4_journal_start(dquot_to_inode(dquot),
0b8e58a1 3872 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
9c3013e9
JK		 3873 if (IS_ERR(handle)) {
3874 /* Release dquot anyway to avoid endless cycle in dqput() */
3875 dquot_release(dquot);
ac27a0ec 3876 return PTR_ERR(handle);
9c3013e9 3877 }
ac27a0ec 3878 ret = dquot_release(dquot);
617ba13b 3879 err = ext4_journal_stop(handle);
ac27a0ec
DK		 3880 if (!ret)
3881 ret = err;
3882 return ret;
3883}
3884
617ba13b 3885static int ext4_mark_dquot_dirty(struct dquot *dquot)
ac27a0ec 3886{
2c8be6b2 3887 /* Are we journaling quotas? */
617ba13b
MC		 3888 if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
3889 EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
ac27a0ec 3890 dquot_mark_dquot_dirty(dquot);
617ba13b 3891 return ext4_write_dquot(dquot);
ac27a0ec
DK		 3892 } else {
3893 return dquot_mark_dquot_dirty(dquot);
3894 }
3895}
3896
617ba13b 3897static int ext4_write_info(struct super_block *sb, int type)
ac27a0ec
DK		 3898{
3899 int ret, err;
3900 handle_t *handle;
3901
3902 /* Data block + inode block */
617ba13b 3903 handle = ext4_journal_start(sb->s_root->d_inode, 2);
ac27a0ec
DK		 3904 if (IS_ERR(handle))
3905 return PTR_ERR(handle);
3906 ret = dquot_commit_info(sb, type);
617ba13b 3907 err = ext4_journal_stop(handle);
ac27a0ec
DK		 3908 if (!ret)
3909 ret = err;
3910 return ret;
3911}
3912
3913/*
3914 * Turn on quotas during mount time - we need to find
3915 * the quota file and such...
3916 */
617ba13b 3917static int ext4_quota_on_mount(struct super_block *sb, int type)
ac27a0ec 3918{
617ba13b 3919 return vfs_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
0b8e58a1 3920 EXT4_SB(sb)->s_jquota_fmt, type);
ac27a0ec
DK		 3921}
3922
3923/*
3924 * Standard function to be called on quota_on
3925 */
617ba13b 3926static int ext4_quota_on(struct super_block *sb, int type, int format_id,
307ae18a 3927 char *name)
ac27a0ec
DK		 3928{
3929 int err;
8264613d 3930 struct path path;
ac27a0ec
DK		 3931
3932 if (!test_opt(sb, QUOTA))
3933 return -EINVAL;
0623543b 3934
8264613d 3935 err = kern_path(name, LOOKUP_FOLLOW, &path);
ac27a0ec
DK		 3936 if (err)
3937 return err;
0623543b 3938
ac27a0ec 3939 /* Quotafile not on the same filesystem? */
8264613d
AV		 3940 if (path.mnt->mnt_sb != sb) {
3941 path_put(&path);
ac27a0ec
DK		 3942 return -EXDEV;
3943 }
0623543b
JK		 3944 /* Journaling quota? */
3945 if (EXT4_SB(sb)->s_qf_names[type]) {
2b2d6d01 3946 /* Quotafile not in fs root? */
8264613d 3947 if (path.dentry->d_parent != sb->s_root)
b31e1552
ES		 3948 ext4_msg(sb, KERN_WARNING,
3949 "Quota file not on filesystem root. "
3950 "Journaled quota will not work");
2b2d6d01 3951 }
0623543b
JK		 3952
3953 /*
3954 * When we journal data on quota file, we have to flush journal to see
3955 * all updates to the file when we bypass pagecache...
3956 */
0390131b
FM		 3957 if (EXT4_SB(sb)->s_journal &&
3958 ext4_should_journal_data(path.dentry->d_inode)) {
0623543b
JK		 3959 /*
3960 * We don't need to lock updates but journal_flush() could
3961 * otherwise be livelocked...
3962 */
3963 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
7ffe1ea8 3964 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
0623543b 3965 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
7ffe1ea8 3966 if (err) {
8264613d 3967 path_put(&path);
7ffe1ea8
HK		 3968 return err;
3969 }
0623543b
JK		 3970 }
3971
8264613d
AV		 3972 err = vfs_quota_on_path(sb, type, format_id, &path);
3973 path_put(&path);
77e69dac 3974 return err;
ac27a0ec
DK		 3975}
3976
3977/* Read data from quotafile - avoid pagecache and such because we cannot afford
3978 * acquiring the locks... As quota files are never truncated and quota code
3979 * itself serializes the operations (and noone else should touch the files)
3980 * we don't have to be afraid of races */
617ba13b 3981static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec
DK		 3982 size_t len, loff_t off)
3983{
3984 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 3985 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 3986 int err = 0;
3987 int offset = off & (sb->s_blocksize - 1);
3988 int tocopy;
3989 size_t toread;
3990 struct buffer_head *bh;
3991 loff_t i_size = i_size_read(inode);
3992
3993 if (off > i_size)
3994 return 0;
3995 if (off+len > i_size)
3996 len = i_size-off;
3997 toread = len;
3998 while (toread > 0) {
3999 tocopy = sb->s_blocksize - offset < toread ?
4000 sb->s_blocksize - offset : toread;
617ba13b 4001 bh = ext4_bread(NULL, inode, blk, 0, &err);
ac27a0ec
DK		 4002 if (err)
4003 return err;
4004 if (!bh) /* A hole? */
4005 memset(data, 0, tocopy);
4006 else
4007 memcpy(data, bh->b_data+offset, tocopy);
4008 brelse(bh);
4009 offset = 0;
4010 toread -= tocopy;
4011 data += tocopy;
4012 blk++;
4013 }
4014 return len;
4015}
4016
4017/* Write to quotafile (we know the transaction is already started and has
4018 * enough credits) */
617ba13b 4019static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec
DK		 4020 const char *data, size_t len, loff_t off)
4021{
4022 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 4023 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 4024 int err = 0;
4025 int offset = off & (sb->s_blocksize - 1);
617ba13b 4026 int journal_quota = EXT4_SB(sb)->s_qf_names[type] != NULL;
ac27a0ec
DK		 4027 struct buffer_head *bh;
4028 handle_t *handle = journal_current_handle();
4029
0390131b 4030 if (EXT4_SB(sb)->s_journal && !handle) {
b31e1552
ES		 4031 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
4032 " cancelled because transaction is not started",
9c3013e9
JK		 4033 (unsigned long long)off, (unsigned long long)len);
4034 return -EIO;
4035 }
67eeb568
DM		 4036 /*
4037 * Since we account only one data block in transaction credits,
4038 * then it is impossible to cross a block boundary.
4039 */
4040 if (sb->s_blocksize - offset < len) {
4041 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
4042 " cancelled because not block aligned",
4043 (unsigned long long)off, (unsigned long long)len);
4044 return -EIO;
4045 }
4046
ac27a0ec 4047 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
67eeb568
DM		 4048 bh = ext4_bread(handle, inode, blk, 1, &err);
4049 if (!bh)
4050 goto out;
4051 if (journal_quota) {
4052 err = ext4_journal_get_write_access(handle, bh);
4053 if (err) {
4054 brelse(bh);
ac27a0ec 4055 goto out;
ac27a0ec 4056 }
ac27a0ec 4057 }
67eeb568
DM		 4058 lock_buffer(bh);
4059 memcpy(bh->b_data+offset, data, len);
4060 flush_dcache_page(bh->b_page);
4061 unlock_buffer(bh);
4062 if (journal_quota)
4063 err = ext4_handle_dirty_metadata(handle, NULL, bh);
4064 else {
4065 /* Always do at least ordered writes for quotas */
4066 err = ext4_jbd2_file_inode(handle, inode);
4067 mark_buffer_dirty(bh);
4068 }
4069 brelse(bh);
ac27a0ec 4070out:
67eeb568 4071 if (err) {
4d04e4fb 4072 mutex_unlock(&inode->i_mutex);
ac27a0ec 4073 return err;
4d04e4fb 4074 }
67eeb568
DM		 4075 if (inode->i_size < off + len) {
4076 i_size_write(inode, off + len);
617ba13b 4077 EXT4_I(inode)->i_disksize = inode->i_size;
ac27a0ec 4078 }
ac27a0ec 4079 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
617ba13b 4080 ext4_mark_inode_dirty(handle, inode);
ac27a0ec 4081 mutex_unlock(&inode->i_mutex);
67eeb568 4082 return len;
ac27a0ec
DK		 4083}
4084
4085#endif
4086
0b8e58a1
AD		 4087static int ext4_get_sb(struct file_system_type *fs_type, int flags,
4088 const char *dev_name, void *data, struct vfsmount *mnt)
ac27a0ec 4089{
0b8e58a1 4090 return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super,mnt);
ac27a0ec
DK		 4091}
4092
37f328eb 4093#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
24b58424
TT		 4094static struct file_system_type ext2_fs_type = {
4095 .owner = THIS_MODULE,
4096 .name = "ext2",
4097 .get_sb = ext4_get_sb,
4098 .kill_sb = kill_block_super,
4099 .fs_flags = FS_REQUIRES_DEV,
4100};
4101
4102static inline void register_as_ext2(void)
4103{
4104 int err = register_filesystem(&ext2_fs_type);
4105 if (err)
4106 printk(KERN_WARNING
4107 "EXT4-fs: Unable to register as ext2 (%d)\n", err);
4108}
4109
4110static inline void unregister_as_ext2(void)
4111{
4112 unregister_filesystem(&ext2_fs_type);
4113}
51b7e3c9 4114MODULE_ALIAS("ext2");
24b58424
TT		 4115#else
4116static inline void register_as_ext2(void) { }
4117static inline void unregister_as_ext2(void) { }
4118#endif
4119
37f328eb 4120#if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
24b58424
TT		 4121static inline void register_as_ext3(void)
4122{
4123 int err = register_filesystem(&ext3_fs_type);
4124 if (err)
4125 printk(KERN_WARNING
4126 "EXT4-fs: Unable to register as ext3 (%d)\n", err);
4127}
4128
4129static inline void unregister_as_ext3(void)
4130{
4131 unregister_filesystem(&ext3_fs_type);
4132}
51b7e3c9 4133MODULE_ALIAS("ext3");
24b58424
TT		 4134#else
4135static inline void register_as_ext3(void) { }
4136static inline void unregister_as_ext3(void) { }
4137#endif
4138
03010a33
TT		 4139static struct file_system_type ext4_fs_type = {
4140 .owner = THIS_MODULE,
4141 .name = "ext4",
4142 .get_sb = ext4_get_sb,
4143 .kill_sb = kill_block_super,
4144 .fs_flags = FS_REQUIRES_DEV,
4145};
4146
617ba13b 4147static int __init init_ext4_fs(void)
ac27a0ec 4148{
c9de560d
AT		 4149 int err;
4150
6fd058f7
TT		 4151 err = init_ext4_system_zone();
4152 if (err)
4153 return err;
3197ebdb
TT		 4154 ext4_kset = kset_create_and_add("ext4", NULL, fs_kobj);
4155 if (!ext4_kset)
6fd058f7 4156 goto out4;
9f6200bb 4157 ext4_proc_root = proc_mkdir("fs/ext4", NULL);
c9de560d 4158 err = init_ext4_mballoc();
ac27a0ec 4159 if (err)
6fd058f7 4160 goto out3;
c9de560d
AT		 4161
4162 err = init_ext4_xattr();
4163 if (err)
4164 goto out2;
ac27a0ec
DK		 4165 err = init_inodecache();
4166 if (err)
4167 goto out1;
24b58424
TT		 4168 register_as_ext2();
4169 register_as_ext3();
03010a33 4170 err = register_filesystem(&ext4_fs_type);
ac27a0ec
DK		 4171 if (err)
4172 goto out;
4173 return 0;
4174out:
24b58424
TT		 4175 unregister_as_ext2();
4176 unregister_as_ext3();
ac27a0ec
DK		 4177 destroy_inodecache();
4178out1:
617ba13b 4179 exit_ext4_xattr();
c9de560d
AT		 4180out2:
4181 exit_ext4_mballoc();
6fd058f7
TT		 4182out3:
4183 remove_proc_entry("fs/ext4", NULL);
4184 kset_unregister(ext4_kset);
4185out4:
4186 exit_ext4_system_zone();
ac27a0ec
DK		 4187 return err;
4188}
4189
617ba13b 4190static void __exit exit_ext4_fs(void)
ac27a0ec 4191{
24b58424
TT		 4192 unregister_as_ext2();
4193 unregister_as_ext3();
03010a33 4194 unregister_filesystem(&ext4_fs_type);
ac27a0ec 4195 destroy_inodecache();
617ba13b 4196 exit_ext4_xattr();
c9de560d 4197 exit_ext4_mballoc();
9f6200bb 4198 remove_proc_entry("fs/ext4", NULL);
3197ebdb 4199 kset_unregister(ext4_kset);
6fd058f7 4200 exit_ext4_system_zone();
ac27a0ec
DK		 4201}
4202
4203MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
83982b6f 4204MODULE_DESCRIPTION("Fourth Extended Filesystem");
ac27a0ec 4205MODULE_LICENSE("GPL");
617ba13b
MC		 4206module_init(init_ext4_fs)
4207module_exit(exit_ext4_fs)
Ubuntu Artful kernel mirror