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ext4: remove the journal=update mount option
[deliverable/linux.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>
ac27a0ec 29#include <linux/buffer_head.h>
a5694255 30#include <linux/exportfs.h>
ac27a0ec
DK		 31#include <linux/vfs.h>
32#include <linux/random.h>
33#include <linux/mount.h>
34#include <linux/namei.h>
35#include <linux/quotaops.h>
36#include <linux/seq_file.h>
9f6200bb 37#include <linux/proc_fs.h>
3197ebdb 38#include <linux/ctype.h>
1330593e 39#include <linux/log2.h>
717d50e4 40#include <linux/crc16.h>
7abc52c2 41#include <linux/cleancache.h>
ac27a0ec
DK		 42#include <asm/uaccess.h>
43
bfff6873
LC		 44#include <linux/kthread.h>
45#include <linux/freezer.h>
46
3dcf5451 47#include "ext4.h"
6f91bc5f 48#include "ext4_extents.h"
3dcf5451 49#include "ext4_jbd2.h"
ac27a0ec
DK		 50#include "xattr.h"
51#include "acl.h"
3661d286 52#include "mballoc.h"
ac27a0ec 53
9bffad1e
TT		 54#define CREATE_TRACE_POINTS
55#include <trace/events/ext4.h>
56
1f109d5a 57static struct proc_dir_entry *ext4_proc_root;
3197ebdb 58static struct kset *ext4_kset;
0b75a840
LC		 59static struct ext4_lazy_init *ext4_li_info;
60static struct mutex ext4_li_mtx;
61static struct ext4_features *ext4_feat;
9f6200bb 62
617ba13b 63static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
ac27a0ec 64 unsigned long journal_devnum);
e2d67052 65static int ext4_commit_super(struct super_block *sb, int sync);
2b2d6d01
TT		 66static void ext4_mark_recovery_complete(struct super_block *sb,
67 struct ext4_super_block *es);
68static void ext4_clear_journal_err(struct super_block *sb,
69 struct ext4_super_block *es);
617ba13b 70static int ext4_sync_fs(struct super_block *sb, int wait);
2b2d6d01 71static const char *ext4_decode_error(struct super_block *sb, int errno,
ac27a0ec 72 char nbuf[16]);
2b2d6d01
TT		 73static int ext4_remount(struct super_block *sb, int *flags, char *data);
74static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
c4be0c1d 75static int ext4_unfreeze(struct super_block *sb);
2b2d6d01 76static void ext4_write_super(struct super_block *sb);
c4be0c1d 77static int ext4_freeze(struct super_block *sb);
152a0836
AV		 78static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
79 const char *dev_name, void *data);
2035e776
TT		 80static inline int ext2_feature_set_ok(struct super_block *sb);
81static inline int ext3_feature_set_ok(struct super_block *sb);
d39195c3 82static int ext4_feature_set_ok(struct super_block *sb, int readonly);
bfff6873
LC		 83static void ext4_destroy_lazyinit_thread(void);
84static void ext4_unregister_li_request(struct super_block *sb);
8f1f7453 85static void ext4_clear_request_list(void);
ac27a0ec 86
2035e776
TT		 87#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
88static struct file_system_type ext2_fs_type = {
89 .owner = THIS_MODULE,
90 .name = "ext2",
91 .mount = ext4_mount,
92 .kill_sb = kill_block_super,
93 .fs_flags = FS_REQUIRES_DEV,
94};
95#define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type)
96#else
97#define IS_EXT2_SB(sb) (0)
98#endif
99
100
ba69f9ab
JK		 101#if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
102static struct file_system_type ext3_fs_type = {
103 .owner = THIS_MODULE,
104 .name = "ext3",
152a0836 105 .mount = ext4_mount,
ba69f9ab
JK		 106 .kill_sb = kill_block_super,
107 .fs_flags = FS_REQUIRES_DEV,
108};
109#define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type)
110#else
111#define IS_EXT3_SB(sb) (0)
112#endif
bd81d8ee 113
9933fc0a
TT		 114void *ext4_kvmalloc(size_t size, gfp_t flags)
115{
116 void *ret;
117
118 ret = kmalloc(size, flags);
119 if (!ret)
120 ret = __vmalloc(size, flags, PAGE_KERNEL);
121 return ret;
122}
123
124void *ext4_kvzalloc(size_t size, gfp_t flags)
125{
126 void *ret;
127
db9481c0 128 ret = kzalloc(size, flags);
9933fc0a
TT		 129 if (!ret)
130 ret = __vmalloc(size, flags | __GFP_ZERO, PAGE_KERNEL);
131 return ret;
132}
133
134void ext4_kvfree(void *ptr)
135{
136 if (is_vmalloc_addr(ptr))
137 vfree(ptr);
138 else
139 kfree(ptr);
140
141}
142
8fadc143
AR		 143ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
144 struct ext4_group_desc *bg)
bd81d8ee 145{
3a14589c 146 return le32_to_cpu(bg->bg_block_bitmap_lo) |
8fadc143 147 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 148 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 149}
150
8fadc143
AR		 151ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
152 struct ext4_group_desc *bg)
bd81d8ee 153{
5272f837 154 return le32_to_cpu(bg->bg_inode_bitmap_lo) |
8fadc143 155 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 156 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 157}
158
8fadc143
AR		 159ext4_fsblk_t ext4_inode_table(struct super_block *sb,
160 struct ext4_group_desc *bg)
bd81d8ee 161{
5272f837 162 return le32_to_cpu(bg->bg_inode_table_lo) |
8fadc143 163 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 164 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
bd81d8ee
LV		 165}
166
021b65bb
TT		 167__u32 ext4_free_group_clusters(struct super_block *sb,
168 struct ext4_group_desc *bg)
560671a0
AK		 169{
170 return le16_to_cpu(bg->bg_free_blocks_count_lo) |
171 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 172 (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0);
560671a0
AK		 173}
174
175__u32 ext4_free_inodes_count(struct super_block *sb,
176 struct ext4_group_desc *bg)
177{
178 return le16_to_cpu(bg->bg_free_inodes_count_lo) |
179 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 180 (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0);
560671a0
AK		 181}
182
183__u32 ext4_used_dirs_count(struct super_block *sb,
184 struct ext4_group_desc *bg)
185{
186 return le16_to_cpu(bg->bg_used_dirs_count_lo) |
187 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 188 (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0);
560671a0
AK		 189}
190
191__u32 ext4_itable_unused_count(struct super_block *sb,
192 struct ext4_group_desc *bg)
193{
194 return le16_to_cpu(bg->bg_itable_unused_lo) |
195 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 196 (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0);
560671a0
AK		 197}
198
8fadc143
AR		 199void ext4_block_bitmap_set(struct super_block *sb,
200 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 201{
3a14589c 202 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 203 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
204 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 205}
206
8fadc143
AR		 207void ext4_inode_bitmap_set(struct super_block *sb,
208 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 209{
5272f837 210 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 211 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
212 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 213}
214
8fadc143
AR		 215void ext4_inode_table_set(struct super_block *sb,
216 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 217{
5272f837 218 bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 219 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
220 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 221}
222
021b65bb
TT		 223void ext4_free_group_clusters_set(struct super_block *sb,
224 struct ext4_group_desc *bg, __u32 count)
560671a0
AK		 225{
226 bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count);
227 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
228 bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16);
229}
230
231void ext4_free_inodes_set(struct super_block *sb,
232 struct ext4_group_desc *bg, __u32 count)
233{
234 bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count);
235 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
236 bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16);
237}
238
239void ext4_used_dirs_set(struct super_block *sb,
240 struct ext4_group_desc *bg, __u32 count)
241{
242 bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count);
243 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
244 bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16);
245}
246
247void ext4_itable_unused_set(struct super_block *sb,
248 struct ext4_group_desc *bg, __u32 count)
249{
250 bg->bg_itable_unused_lo = cpu_to_le16((__u16)count);
251 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
252 bg->bg_itable_unused_hi = cpu_to_le16(count >> 16);
253}
254
d3d1faf6
CW		 255
256/* Just increment the non-pointer handle value */
257static handle_t *ext4_get_nojournal(void)
258{
259 handle_t *handle = current->journal_info;
260 unsigned long ref_cnt = (unsigned long)handle;
261
262 BUG_ON(ref_cnt >= EXT4_NOJOURNAL_MAX_REF_COUNT);
263
264 ref_cnt++;
265 handle = (handle_t *)ref_cnt;
266
267 current->journal_info = handle;
268 return handle;
269}
270
271
272/* Decrement the non-pointer handle value */
273static void ext4_put_nojournal(handle_t *handle)
274{
275 unsigned long ref_cnt = (unsigned long)handle;
276
277 BUG_ON(ref_cnt == 0);
278
279 ref_cnt--;
280 handle = (handle_t *)ref_cnt;
281
282 current->journal_info = handle;
283}
284
ac27a0ec 285/*
dab291af 286 * Wrappers for jbd2_journal_start/end.
ac27a0ec
DK		 287 *
288 * The only special thing we need to do here is to make sure that all
289 * journal_end calls result in the superblock being marked dirty, so
290 * that sync() will call the filesystem's write_super callback if
291 * appropriate.
be4f27d3
YY		 292 *
293 * To avoid j_barrier hold in userspace when a user calls freeze(),
294 * ext4 prevents a new handle from being started by s_frozen, which
295 * is in an upper layer.
ac27a0ec 296 */
617ba13b 297handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks)
ac27a0ec
DK		 298{
299 journal_t *journal;
be4f27d3 300 handle_t *handle;
ac27a0ec 301
12706394 302 trace_ext4_journal_start(sb, nblocks, _RET_IP_);
ac27a0ec
DK		 303 if (sb->s_flags & MS_RDONLY)
304 return ERR_PTR(-EROFS);
305
617ba13b 306 journal = EXT4_SB(sb)->s_journal;
be4f27d3
YY		 307 handle = ext4_journal_current_handle();
308
309 /*
310 * If a handle has been started, it should be allowed to
311 * finish, otherwise deadlock could happen between freeze
312 * and others(e.g. truncate) due to the restart of the
313 * journal handle if the filesystem is forzen and active
314 * handles are not stopped.
315 */
316 if (!handle)
317 vfs_check_frozen(sb, SB_FREEZE_TRANS);
318
319 if (!journal)
320 return ext4_get_nojournal();
321 /*
322 * Special case here: if the journal has aborted behind our
323 * backs (eg. EIO in the commit thread), then we still need to
324 * take the FS itself readonly cleanly.
325 */
326 if (is_journal_aborted(journal)) {
327 ext4_abort(sb, "Detected aborted journal");
328 return ERR_PTR(-EROFS);
ac27a0ec 329 }
be4f27d3 330 return jbd2_journal_start(journal, nblocks);
ac27a0ec
DK		 331}
332
333/*
334 * The only special thing we need to do here is to make sure that all
dab291af 335 * jbd2_journal_stop calls result in the superblock being marked dirty, so
ac27a0ec
DK		 336 * that sync() will call the filesystem's write_super callback if
337 * appropriate.
338 */
c398eda0 339int __ext4_journal_stop(const char *where, unsigned int line, handle_t *handle)
ac27a0ec
DK		 340{
341 struct super_block *sb;
342 int err;
343 int rc;
344
0390131b 345 if (!ext4_handle_valid(handle)) {
d3d1faf6 346 ext4_put_nojournal(handle);
0390131b
FM		 347 return 0;
348 }
ac27a0ec
DK		 349 sb = handle->h_transaction->t_journal->j_private;
350 err = handle->h_err;
dab291af 351 rc = jbd2_journal_stop(handle);
ac27a0ec
DK		 352
353 if (!err)
354 err = rc;
355 if (err)
c398eda0 356 __ext4_std_error(sb, where, line, err);
ac27a0ec
DK		 357 return err;
358}
359
90c7201b
TT		 360void ext4_journal_abort_handle(const char *caller, unsigned int line,
361 const char *err_fn, struct buffer_head *bh,
362 handle_t *handle, int err)
ac27a0ec
DK		 363{
364 char nbuf[16];
617ba13b 365 const char *errstr = ext4_decode_error(NULL, err, nbuf);
ac27a0ec 366
0390131b
FM		 367 BUG_ON(!ext4_handle_valid(handle));
368
ac27a0ec
DK		 369 if (bh)
370 BUFFER_TRACE(bh, "abort");
371
372 if (!handle->h_err)
373 handle->h_err = err;
374
375 if (is_handle_aborted(handle))
376 return;
377
90c7201b
TT		 378 printk(KERN_ERR "%s:%d: aborting transaction: %s in %s\n",
379 caller, line, errstr, err_fn);
ac27a0ec 380
dab291af 381 jbd2_journal_abort_handle(handle);
ac27a0ec
DK		 382}
383
1c13d5c0
TT		 384static void __save_error_info(struct super_block *sb, const char *func,
385 unsigned int line)
386{
387 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
388
389 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
390 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
391 es->s_last_error_time = cpu_to_le32(get_seconds());
392 strncpy(es->s_last_error_func, func, sizeof(es->s_last_error_func));
393 es->s_last_error_line = cpu_to_le32(line);
394 if (!es->s_first_error_time) {
395 es->s_first_error_time = es->s_last_error_time;
396 strncpy(es->s_first_error_func, func,
397 sizeof(es->s_first_error_func));
398 es->s_first_error_line = cpu_to_le32(line);
399 es->s_first_error_ino = es->s_last_error_ino;
400 es->s_first_error_block = es->s_last_error_block;
401 }
66e61a9e
TT		 402 /*
403 * Start the daily error reporting function if it hasn't been
404 * started already
405 */
406 if (!es->s_error_count)
407 mod_timer(&EXT4_SB(sb)->s_err_report, jiffies + 24*60*60*HZ);
1c13d5c0
TT		 408 es->s_error_count = cpu_to_le32(le32_to_cpu(es->s_error_count) + 1);
409}
410
411static void save_error_info(struct super_block *sb, const char *func,
412 unsigned int line)
413{
414 __save_error_info(sb, func, line);
415 ext4_commit_super(sb, 1);
416}
417
7c2e7087
TT		 418/*
419 * The del_gendisk() function uninitializes the disk-specific data
420 * structures, including the bdi structure, without telling anyone
421 * else. Once this happens, any attempt to call mark_buffer_dirty()
422 * (for example, by ext4_commit_super), will cause a kernel OOPS.
423 * This is a kludge to prevent these oops until we can put in a proper
424 * hook in del_gendisk() to inform the VFS and file system layers.
425 */
426static int block_device_ejected(struct super_block *sb)
427{
428 struct inode *bd_inode = sb->s_bdev->bd_inode;
429 struct backing_dev_info *bdi = bd_inode->i_mapping->backing_dev_info;
430
431 return bdi->dev == NULL;
432}
433
18aadd47
BJ		 434static void ext4_journal_commit_callback(journal_t *journal, transaction_t *txn)
435{
436 struct super_block *sb = journal->j_private;
437 struct ext4_sb_info *sbi = EXT4_SB(sb);
438 int error = is_journal_aborted(journal);
439 struct ext4_journal_cb_entry *jce, *tmp;
440
441 spin_lock(&sbi->s_md_lock);
442 list_for_each_entry_safe(jce, tmp, &txn->t_private_list, jce_list) {
443 list_del_init(&jce->jce_list);
444 spin_unlock(&sbi->s_md_lock);
445 jce->jce_func(sb, jce, error);
446 spin_lock(&sbi->s_md_lock);
447 }
448 spin_unlock(&sbi->s_md_lock);
449}
1c13d5c0 450
ac27a0ec
DK		 451/* Deal with the reporting of failure conditions on a filesystem such as
452 * inconsistencies detected or read IO failures.
453 *
454 * On ext2, we can store the error state of the filesystem in the
617ba13b 455 * superblock. That is not possible on ext4, because we may have other
ac27a0ec
DK		 456 * write ordering constraints on the superblock which prevent us from
457 * writing it out straight away; and given that the journal is about to
458 * be aborted, we can't rely on the current, or future, transactions to
459 * write out the superblock safely.
460 *
dab291af 461 * We'll just use the jbd2_journal_abort() error code to record an error in
d6b198bc 462 * the journal instead. On recovery, the journal will complain about
ac27a0ec
DK		 463 * that error until we've noted it down and cleared it.
464 */
465
617ba13b 466static void ext4_handle_error(struct super_block *sb)
ac27a0ec 467{
ac27a0ec
DK		 468 if (sb->s_flags & MS_RDONLY)
469 return;
470
2b2d6d01 471 if (!test_opt(sb, ERRORS_CONT)) {
617ba13b 472 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 473
4ab2f15b 474 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
ac27a0ec 475 if (journal)
dab291af 476 jbd2_journal_abort(journal, -EIO);
ac27a0ec 477 }
2b2d6d01 478 if (test_opt(sb, ERRORS_RO)) {
b31e1552 479 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
ac27a0ec
DK		 480 sb->s_flags |= MS_RDONLY;
481 }
ac27a0ec 482 if (test_opt(sb, ERRORS_PANIC))
617ba13b 483 panic("EXT4-fs (device %s): panic forced after error\n",
ac27a0ec
DK		 484 sb->s_id);
485}
486
12062ddd 487void __ext4_error(struct super_block *sb, const char *function,
c398eda0 488 unsigned int line, const char *fmt, ...)
ac27a0ec 489{
0ff2ea7d 490 struct va_format vaf;
ac27a0ec
DK		 491 va_list args;
492
493 va_start(args, fmt);
0ff2ea7d
JP		 494 vaf.fmt = fmt;
495 vaf.va = &args;
496 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n",
497 sb->s_id, function, line, current->comm, &vaf);
ac27a0ec
DK		 498 va_end(args);
499
617ba13b 500 ext4_handle_error(sb);
ac27a0ec
DK		 501}
502
c398eda0
TT		 503void ext4_error_inode(struct inode *inode, const char *function,
504 unsigned int line, ext4_fsblk_t block,
273df556
FM		 505 const char *fmt, ...)
506{
507 va_list args;
f7c21177 508 struct va_format vaf;
1c13d5c0 509 struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
273df556 510
1c13d5c0
TT		 511 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
512 es->s_last_error_block = cpu_to_le64(block);
513 save_error_info(inode->i_sb, function, line);
273df556 514 va_start(args, fmt);
f7c21177
TT		 515 vaf.fmt = fmt;
516 vaf.va = &args;
c398eda0
TT		 517 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: inode #%lu: ",
518 inode->i_sb->s_id, function, line, inode->i_ino);
519 if (block)
f7c21177
TT		 520 printk(KERN_CONT "block %llu: ", block);
521 printk(KERN_CONT "comm %s: %pV\n", current->comm, &vaf);
273df556
FM		 522 va_end(args);
523
524 ext4_handle_error(inode->i_sb);
525}
526
c398eda0 527void ext4_error_file(struct file *file, const char *function,
f7c21177
TT		 528 unsigned int line, ext4_fsblk_t block,
529 const char *fmt, ...)
273df556
FM		 530{
531 va_list args;
f7c21177 532 struct va_format vaf;
1c13d5c0 533 struct ext4_super_block *es;
273df556
FM		 534 struct inode *inode = file->f_dentry->d_inode;
535 char pathname[80], *path;
536
1c13d5c0
TT		 537 es = EXT4_SB(inode->i_sb)->s_es;
538 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
539 save_error_info(inode->i_sb, function, line);
273df556 540 path = d_path(&(file->f_path), pathname, sizeof(pathname));
f9a62d09 541 if (IS_ERR(path))
273df556
FM		 542 path = "(unknown)";
543 printk(KERN_CRIT
f7c21177
TT		 544 "EXT4-fs error (device %s): %s:%d: inode #%lu: ",
545 inode->i_sb->s_id, function, line, inode->i_ino);
546 if (block)
547 printk(KERN_CONT "block %llu: ", block);
548 va_start(args, fmt);
549 vaf.fmt = fmt;
550 vaf.va = &args;
551 printk(KERN_CONT "comm %s: path %s: %pV\n", current->comm, path, &vaf);
273df556
FM		 552 va_end(args);
553
554 ext4_handle_error(inode->i_sb);
555}
556
2b2d6d01 557static const char *ext4_decode_error(struct super_block *sb, int errno,
ac27a0ec
DK		 558 char nbuf[16])
559{
560 char *errstr = NULL;
561
562 switch (errno) {
563 case -EIO:
564 errstr = "IO failure";
565 break;
566 case -ENOMEM:
567 errstr = "Out of memory";
568 break;
569 case -EROFS:
78f1ddbb
TT		 570 if (!sb || (EXT4_SB(sb)->s_journal &&
571 EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT))
ac27a0ec
DK		 572 errstr = "Journal has aborted";
573 else
574 errstr = "Readonly filesystem";
575 break;
576 default:
577 /* If the caller passed in an extra buffer for unknown
578 * errors, textualise them now. Else we just return
579 * NULL. */
580 if (nbuf) {
581 /* Check for truncated error codes... */
582 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
583 errstr = nbuf;
584 }
585 break;
586 }
587
588 return errstr;
589}
590
617ba13b 591/* __ext4_std_error decodes expected errors from journaling functions
ac27a0ec
DK		 592 * automatically and invokes the appropriate error response. */
593
c398eda0
TT		 594void __ext4_std_error(struct super_block *sb, const char *function,
595 unsigned int line, int errno)
ac27a0ec
DK		 596{
597 char nbuf[16];
598 const char *errstr;
599
600 /* Special case: if the error is EROFS, and we're not already
601 * inside a transaction, then there's really no point in logging
602 * an error. */
603 if (errno == -EROFS && journal_current_handle() == NULL &&
604 (sb->s_flags & MS_RDONLY))
605 return;
606
617ba13b 607 errstr = ext4_decode_error(sb, errno, nbuf);
c398eda0
TT		 608 printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n",
609 sb->s_id, function, line, errstr);
1c13d5c0 610 save_error_info(sb, function, line);
ac27a0ec 611
617ba13b 612 ext4_handle_error(sb);
ac27a0ec
DK		 613}
614
615/*
617ba13b 616 * ext4_abort is a much stronger failure handler than ext4_error. The
ac27a0ec
DK		 617 * abort function may be used to deal with unrecoverable failures such
618 * as journal IO errors or ENOMEM at a critical moment in log management.
619 *
620 * We unconditionally force the filesystem into an ABORT|READONLY state,
621 * unless the error response on the fs has been set to panic in which
622 * case we take the easy way out and panic immediately.
623 */
624
c67d859e 625void __ext4_abort(struct super_block *sb, const char *function,
c398eda0 626 unsigned int line, const char *fmt, ...)
ac27a0ec
DK		 627{
628 va_list args;
629
1c13d5c0 630 save_error_info(sb, function, line);
ac27a0ec 631 va_start(args, fmt);
c398eda0
TT		 632 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: ", sb->s_id,
633 function, line);
ac27a0ec
DK		 634 vprintk(fmt, args);
635 printk("\n");
636 va_end(args);
637
1c13d5c0
TT		 638 if ((sb->s_flags & MS_RDONLY) == 0) {
639 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
640 sb->s_flags |= MS_RDONLY;
641 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
642 if (EXT4_SB(sb)->s_journal)
643 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
644 save_error_info(sb, function, line);
645 }
ac27a0ec 646 if (test_opt(sb, ERRORS_PANIC))
617ba13b 647 panic("EXT4-fs panic from previous error\n");
ac27a0ec
DK		 648}
649
0ff2ea7d 650void ext4_msg(struct super_block *sb, const char *prefix, const char *fmt, ...)
b31e1552 651{
0ff2ea7d 652 struct va_format vaf;
b31e1552
ES		 653 va_list args;
654
655 va_start(args, fmt);
0ff2ea7d
JP		 656 vaf.fmt = fmt;
657 vaf.va = &args;
658 printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
b31e1552
ES		 659 va_end(args);
660}
661
12062ddd 662void __ext4_warning(struct super_block *sb, const char *function,
c398eda0 663 unsigned int line, const char *fmt, ...)
ac27a0ec 664{
0ff2ea7d 665 struct va_format vaf;
ac27a0ec
DK		 666 va_list args;
667
668 va_start(args, fmt);
0ff2ea7d
JP		 669 vaf.fmt = fmt;
670 vaf.va = &args;
671 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: %pV\n",
672 sb->s_id, function, line, &vaf);
ac27a0ec
DK		 673 va_end(args);
674}
675
e29136f8
TT		 676void __ext4_grp_locked_error(const char *function, unsigned int line,
677 struct super_block *sb, ext4_group_t grp,
678 unsigned long ino, ext4_fsblk_t block,
679 const char *fmt, ...)
5d1b1b3f
AK		 680__releases(bitlock)
681__acquires(bitlock)
682{
0ff2ea7d 683 struct va_format vaf;
5d1b1b3f
AK		 684 va_list args;
685 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
686
1c13d5c0
TT		 687 es->s_last_error_ino = cpu_to_le32(ino);
688 es->s_last_error_block = cpu_to_le64(block);
689 __save_error_info(sb, function, line);
0ff2ea7d 690
5d1b1b3f 691 va_start(args, fmt);
0ff2ea7d
JP		 692
693 vaf.fmt = fmt;
694 vaf.va = &args;
21149d61 695 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u, ",
e29136f8
TT		 696 sb->s_id, function, line, grp);
697 if (ino)
0ff2ea7d 698 printk(KERN_CONT "inode %lu: ", ino);
e29136f8 699 if (block)
0ff2ea7d
JP		 700 printk(KERN_CONT "block %llu:", (unsigned long long) block);
701 printk(KERN_CONT "%pV\n", &vaf);
5d1b1b3f
AK		 702 va_end(args);
703
704 if (test_opt(sb, ERRORS_CONT)) {
e2d67052 705 ext4_commit_super(sb, 0);
5d1b1b3f
AK		 706 return;
707 }
1c13d5c0 708
5d1b1b3f
AK		 709 ext4_unlock_group(sb, grp);
710 ext4_handle_error(sb);
711 /*
712 * We only get here in the ERRORS_RO case; relocking the group
713 * may be dangerous, but nothing bad will happen since the
714 * filesystem will have already been marked read/only and the
715 * journal has been aborted. We return 1 as a hint to callers
716 * who might what to use the return value from
25985edc 717 * ext4_grp_locked_error() to distinguish between the
5d1b1b3f
AK		 718 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
719 * aggressively from the ext4 function in question, with a
720 * more appropriate error code.
721 */
722 ext4_lock_group(sb, grp);
723 return;
724}
725
617ba13b 726void ext4_update_dynamic_rev(struct super_block *sb)
ac27a0ec 727{
617ba13b 728 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
ac27a0ec 729
617ba13b 730 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
ac27a0ec
DK		 731 return;
732
12062ddd 733 ext4_warning(sb,
ac27a0ec
DK		 734 "updating to rev %d because of new feature flag, "
735 "running e2fsck is recommended",
617ba13b 736 EXT4_DYNAMIC_REV);
ac27a0ec 737
617ba13b
MC		 738 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
739 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
740 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
ac27a0ec
DK		 741 /* leave es->s_feature_*compat flags alone */
742 /* es->s_uuid will be set by e2fsck if empty */
743
744 /*
745 * The rest of the superblock fields should be zero, and if not it
746 * means they are likely already in use, so leave them alone. We
747 * can leave it up to e2fsck to clean up any inconsistencies there.
748 */
749}
750
751/*
752 * Open the external journal device
753 */
b31e1552 754static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb)
ac27a0ec
DK		 755{
756 struct block_device *bdev;
757 char b[BDEVNAME_SIZE];
758
d4d77629 759 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
ac27a0ec
DK		 760 if (IS_ERR(bdev))
761 goto fail;
762 return bdev;
763
764fail:
b31e1552 765 ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld",
ac27a0ec
DK		 766 __bdevname(dev, b), PTR_ERR(bdev));
767 return NULL;
768}
769
770/*
771 * Release the journal device
772 */
617ba13b 773static int ext4_blkdev_put(struct block_device *bdev)
ac27a0ec 774{
e525fd89 775 return blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
ac27a0ec
DK		 776}
777
617ba13b 778static int ext4_blkdev_remove(struct ext4_sb_info *sbi)
ac27a0ec
DK		 779{
780 struct block_device *bdev;
781 int ret = -ENODEV;
782
783 bdev = sbi->journal_bdev;
784 if (bdev) {
617ba13b 785 ret = ext4_blkdev_put(bdev);
ac27a0ec
DK		 786 sbi->journal_bdev = NULL;
787 }
788 return ret;
789}
790
791static inline struct inode *orphan_list_entry(struct list_head *l)
792{
617ba13b 793 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
ac27a0ec
DK		 794}
795
617ba13b 796static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
ac27a0ec
DK		 797{
798 struct list_head *l;
799
b31e1552
ES		 800 ext4_msg(sb, KERN_ERR, "sb orphan head is %d",
801 le32_to_cpu(sbi->s_es->s_last_orphan));
ac27a0ec
DK		 802
803 printk(KERN_ERR "sb_info orphan list:\n");
804 list_for_each(l, &sbi->s_orphan) {
805 struct inode *inode = orphan_list_entry(l);
806 printk(KERN_ERR " "
807 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
808 inode->i_sb->s_id, inode->i_ino, inode,
809 inode->i_mode, inode->i_nlink,
810 NEXT_ORPHAN(inode));
811 }
812}
813
2b2d6d01 814static void ext4_put_super(struct super_block *sb)
ac27a0ec 815{
617ba13b
MC		 816 struct ext4_sb_info *sbi = EXT4_SB(sb);
817 struct ext4_super_block *es = sbi->s_es;
ef2cabf7 818 int i, err;
ac27a0ec 819
857ac889 820 ext4_unregister_li_request(sb);
e0ccfd95
CH		 821 dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
822
4c0425ff
MC		 823 flush_workqueue(sbi->dio_unwritten_wq);
824 destroy_workqueue(sbi->dio_unwritten_wq);
825
a9e220f8 826 lock_super(sb);
8c85e125 827 if (sb->s_dirt)
ebc1ac16 828 ext4_commit_super(sb, 1);
8c85e125 829
0390131b
FM		 830 if (sbi->s_journal) {
831 err = jbd2_journal_destroy(sbi->s_journal);
832 sbi->s_journal = NULL;
833 if (err < 0)
c67d859e 834 ext4_abort(sb, "Couldn't clean up the journal");
0390131b 835 }
d4edac31 836
a1c6c569 837 del_timer(&sbi->s_err_report);
d4edac31
JB		 838 ext4_release_system_zone(sb);
839 ext4_mb_release(sb);
840 ext4_ext_release(sb);
841 ext4_xattr_put_super(sb);
842
ac27a0ec 843 if (!(sb->s_flags & MS_RDONLY)) {
617ba13b 844 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
ac27a0ec 845 es->s_state = cpu_to_le16(sbi->s_mount_state);
e2d67052 846 ext4_commit_super(sb, 1);
ac27a0ec 847 }
240799cd 848 if (sbi->s_proc) {
9f6200bb 849 remove_proc_entry(sb->s_id, ext4_proc_root);
240799cd 850 }
3197ebdb 851 kobject_del(&sbi->s_kobj);
ac27a0ec
DK		 852
853 for (i = 0; i < sbi->s_gdb_count; i++)
854 brelse(sbi->s_group_desc[i]);
f18a5f21 855 ext4_kvfree(sbi->s_group_desc);
9933fc0a 856 ext4_kvfree(sbi->s_flex_groups);
57042651 857 percpu_counter_destroy(&sbi->s_freeclusters_counter);
ac27a0ec
DK		 858 percpu_counter_destroy(&sbi->s_freeinodes_counter);
859 percpu_counter_destroy(&sbi->s_dirs_counter);
57042651 860 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
ac27a0ec
DK		 861 brelse(sbi->s_sbh);
862#ifdef CONFIG_QUOTA
863 for (i = 0; i < MAXQUOTAS; i++)
864 kfree(sbi->s_qf_names[i]);
865#endif
866
867 /* Debugging code just in case the in-memory inode orphan list
868 * isn't empty. The on-disk one can be non-empty if we've
869 * detected an error and taken the fs readonly, but the
870 * in-memory list had better be clean by this point. */
871 if (!list_empty(&sbi->s_orphan))
872 dump_orphan_list(sb, sbi);
873 J_ASSERT(list_empty(&sbi->s_orphan));
874
f98393a6 875 invalidate_bdev(sb->s_bdev);
ac27a0ec
DK		 876 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
877 /*
878 * Invalidate the journal device's buffers. We don't want them
879 * floating about in memory - the physical journal device may
880 * hotswapped, and it breaks the `ro-after' testing code.
881 */
882 sync_blockdev(sbi->journal_bdev);
f98393a6 883 invalidate_bdev(sbi->journal_bdev);
617ba13b 884 ext4_blkdev_remove(sbi);
ac27a0ec 885 }
c5e06d10
JL		 886 if (sbi->s_mmp_tsk)
887 kthread_stop(sbi->s_mmp_tsk);
ac27a0ec 888 sb->s_fs_info = NULL;
3197ebdb
TT		 889 /*
890 * Now that we are completely done shutting down the
891 * superblock, we need to actually destroy the kobject.
892 */
3197ebdb
TT		 893 unlock_super(sb);
894 kobject_put(&sbi->s_kobj);
895 wait_for_completion(&sbi->s_kobj_unregister);
705895b6 896 kfree(sbi->s_blockgroup_lock);
ac27a0ec 897 kfree(sbi);
ac27a0ec
DK		 898}
899
e18b890b 900static struct kmem_cache *ext4_inode_cachep;
ac27a0ec
DK		 901
902/*
903 * Called inside transaction, so use GFP_NOFS
904 */
617ba13b 905static struct inode *ext4_alloc_inode(struct super_block *sb)
ac27a0ec 906{
617ba13b 907 struct ext4_inode_info *ei;
ac27a0ec 908
e6b4f8da 909 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
ac27a0ec
DK		 910 if (!ei)
911 return NULL;
0b8e58a1 912
ac27a0ec 913 ei->vfs_inode.i_version = 1;
91246c00 914 ei->vfs_inode.i_data.writeback_index = 0;
a86c6181 915 memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache));
c9de560d
AT		 916 INIT_LIST_HEAD(&ei->i_prealloc_list);
917 spin_lock_init(&ei->i_prealloc_lock);
d2a17637
MC		 918 ei->i_reserved_data_blocks = 0;
919 ei->i_reserved_meta_blocks = 0;
920 ei->i_allocated_meta_blocks = 0;
9d0be502 921 ei->i_da_metadata_calc_len = 0;
d2a17637 922 spin_lock_init(&(ei->i_block_reservation_lock));
a9e7f447
DM		 923#ifdef CONFIG_QUOTA
924 ei->i_reserved_quota = 0;
925#endif
8aefcd55 926 ei->jinode = NULL;
c7064ef1 927 INIT_LIST_HEAD(&ei->i_completed_io_list);
744692dc 928 spin_lock_init(&ei->i_completed_io_lock);
8d5d02e6 929 ei->cur_aio_dio = NULL;
b436b9be
JK		 930 ei->i_sync_tid = 0;
931 ei->i_datasync_tid = 0;
f7ad6d2e 932 atomic_set(&ei->i_ioend_count, 0);
e9e3bcec 933 atomic_set(&ei->i_aiodio_unwritten, 0);
0b8e58a1 934
ac27a0ec
DK		 935 return &ei->vfs_inode;
936}
937
7ff9c073
TT		 938static int ext4_drop_inode(struct inode *inode)
939{
940 int drop = generic_drop_inode(inode);
941
942 trace_ext4_drop_inode(inode, drop);
943 return drop;
944}
945
fa0d7e3d
NP		 946static void ext4_i_callback(struct rcu_head *head)
947{
948 struct inode *inode = container_of(head, struct inode, i_rcu);
fa0d7e3d
NP		 949 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
950}
951
617ba13b 952static void ext4_destroy_inode(struct inode *inode)
ac27a0ec 953{
9f7dd93d 954 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
b31e1552
ES		 955 ext4_msg(inode->i_sb, KERN_ERR,
956 "Inode %lu (%p): orphan list check failed!",
957 inode->i_ino, EXT4_I(inode));
9f7dd93d
VA		 958 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
959 EXT4_I(inode), sizeof(struct ext4_inode_info),
960 true);
961 dump_stack();
962 }
fa0d7e3d 963 call_rcu(&inode->i_rcu, ext4_i_callback);
ac27a0ec
DK		 964}
965
51cc5068 966static void init_once(void *foo)
ac27a0ec 967{
617ba13b 968 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
ac27a0ec 969
a35afb83 970 INIT_LIST_HEAD(&ei->i_orphan);
03010a33 971#ifdef CONFIG_EXT4_FS_XATTR
a35afb83 972 init_rwsem(&ei->xattr_sem);
ac27a0ec 973#endif
0e855ac8 974 init_rwsem(&ei->i_data_sem);
a35afb83 975 inode_init_once(&ei->vfs_inode);
ac27a0ec
DK		 976}
977
978static int init_inodecache(void)
979{
617ba13b
MC		 980 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
981 sizeof(struct ext4_inode_info),
ac27a0ec
DK		 982 0, (SLAB_RECLAIM_ACCOUNT|
983 SLAB_MEM_SPREAD),
20c2df83 984 init_once);
617ba13b 985 if (ext4_inode_cachep == NULL)
ac27a0ec
DK		 986 return -ENOMEM;
987 return 0;
988}
989
990static void destroy_inodecache(void)
991{
617ba13b 992 kmem_cache_destroy(ext4_inode_cachep);
ac27a0ec
DK		 993}
994
0930fcc1 995void ext4_clear_inode(struct inode *inode)
ac27a0ec 996{
0930fcc1
AV		 997 invalidate_inode_buffers(inode);
998 end_writeback(inode);
9f754758 999 dquot_drop(inode);
c2ea3fde 1000 ext4_discard_preallocations(inode);
8aefcd55
TT		 1001 if (EXT4_I(inode)->jinode) {
1002 jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode),
1003 EXT4_I(inode)->jinode);
1004 jbd2_free_inode(EXT4_I(inode)->jinode);
1005 EXT4_I(inode)->jinode = NULL;
1006 }
ac27a0ec
DK		 1007}
1008
2b2d6d01
TT		 1009static inline void ext4_show_quota_options(struct seq_file *seq,
1010 struct super_block *sb)
ac27a0ec
DK		 1011{
1012#if defined(CONFIG_QUOTA)
617ba13b 1013 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 1014
5a20bdfc
JK		 1015 if (sbi->s_jquota_fmt) {
1016 char *fmtname = "";
1017
1018 switch (sbi->s_jquota_fmt) {
1019 case QFMT_VFS_OLD:
1020 fmtname = "vfsold";
1021 break;
1022 case QFMT_VFS_V0:
1023 fmtname = "vfsv0";
1024 break;
1025 case QFMT_VFS_V1:
1026 fmtname = "vfsv1";
1027 break;
1028 }
1029 seq_printf(seq, ",jqfmt=%s", fmtname);
1030 }
ac27a0ec
DK		 1031
1032 if (sbi->s_qf_names[USRQUOTA])
1033 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
1034
1035 if (sbi->s_qf_names[GRPQUOTA])
1036 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
1037
482a7425 1038 if (test_opt(sb, USRQUOTA))
ac27a0ec
DK		 1039 seq_puts(seq, ",usrquota");
1040
482a7425 1041 if (test_opt(sb, GRPQUOTA))
ac27a0ec
DK		 1042 seq_puts(seq, ",grpquota");
1043#endif
1044}
1045
d9c9bef1
MS		 1046/*
1047 * Show an option if
1048 * - it's set to a non-default value OR
1049 * - if the per-sb default is different from the global default
1050 */
34c80b1d 1051static int ext4_show_options(struct seq_file *seq, struct dentry *root)
ac27a0ec 1052{
aa22df2c
AK		 1053 int def_errors;
1054 unsigned long def_mount_opts;
34c80b1d 1055 struct super_block *sb = root->d_sb;
d9c9bef1
MS		 1056 struct ext4_sb_info *sbi = EXT4_SB(sb);
1057 struct ext4_super_block *es = sbi->s_es;
d9c9bef1
MS		 1058
1059 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
aa22df2c 1060 def_errors = le16_to_cpu(es->s_errors);
d9c9bef1
MS		 1061
1062 if (sbi->s_sb_block != 1)
1063 seq_printf(seq, ",sb=%llu", sbi->s_sb_block);
1064 if (test_opt(sb, MINIX_DF))
1065 seq_puts(seq, ",minixdf");
aa22df2c 1066 if (test_opt(sb, GRPID) && !(def_mount_opts & EXT4_DEFM_BSDGROUPS))
d9c9bef1
MS		 1067 seq_puts(seq, ",grpid");
1068 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT4_DEFM_BSDGROUPS))
1069 seq_puts(seq, ",nogrpid");
1070 if (sbi->s_resuid != EXT4_DEF_RESUID ||
1071 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID) {
1072 seq_printf(seq, ",resuid=%u", sbi->s_resuid);
1073 }
1074 if (sbi->s_resgid != EXT4_DEF_RESGID ||
1075 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID) {
1076 seq_printf(seq, ",resgid=%u", sbi->s_resgid);
1077 }
bb4f397a 1078 if (test_opt(sb, ERRORS_RO)) {
d9c9bef1 1079 if (def_errors == EXT4_ERRORS_PANIC ||
bb4f397a
AK		 1080 def_errors == EXT4_ERRORS_CONTINUE) {
1081 seq_puts(seq, ",errors=remount-ro");
d9c9bef1
MS		 1082 }
1083 }
aa22df2c 1084 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
bb4f397a 1085 seq_puts(seq, ",errors=continue");
aa22df2c 1086 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
d9c9bef1 1087 seq_puts(seq, ",errors=panic");
aa22df2c 1088 if (test_opt(sb, NO_UID32) && !(def_mount_opts & EXT4_DEFM_UID16))
d9c9bef1 1089 seq_puts(seq, ",nouid32");
aa22df2c 1090 if (test_opt(sb, DEBUG) && !(def_mount_opts & EXT4_DEFM_DEBUG))
d9c9bef1 1091 seq_puts(seq, ",debug");
03010a33 1092#ifdef CONFIG_EXT4_FS_XATTR
ea663336 1093 if (test_opt(sb, XATTR_USER))
d9c9bef1 1094 seq_puts(seq, ",user_xattr");
ea663336 1095 if (!test_opt(sb, XATTR_USER))
d9c9bef1 1096 seq_puts(seq, ",nouser_xattr");
d9c9bef1 1097#endif
03010a33 1098#ifdef CONFIG_EXT4_FS_POSIX_ACL
aa22df2c 1099 if (test_opt(sb, POSIX_ACL) && !(def_mount_opts & EXT4_DEFM_ACL))
d9c9bef1
MS		 1100 seq_puts(seq, ",acl");
1101 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT4_DEFM_ACL))
1102 seq_puts(seq, ",noacl");
1103#endif
30773840 1104 if (sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) {
d9c9bef1
MS		 1105 seq_printf(seq, ",commit=%u",
1106 (unsigned) (sbi->s_commit_interval / HZ));
1107 }
30773840
TT		 1108 if (sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME) {
1109 seq_printf(seq, ",min_batch_time=%u",
1110 (unsigned) sbi->s_min_batch_time);
1111 }
1112 if (sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME) {
1113 seq_printf(seq, ",max_batch_time=%u",
1d526fc9 1114 (unsigned) sbi->s_max_batch_time);
30773840
TT		 1115 }
1116
571640ca
ES		 1117 /*
1118 * We're changing the default of barrier mount option, so
1119 * let's always display its mount state so it's clear what its
1120 * status is.
1121 */
1122 seq_puts(seq, ",barrier=");
1123 seq_puts(seq, test_opt(sb, BARRIER) ? "1" : "0");
cd0b6a39
TT		 1124 if (test_opt(sb, JOURNAL_ASYNC_COMMIT))
1125 seq_puts(seq, ",journal_async_commit");
39a4bade
JK		 1126 else if (test_opt(sb, JOURNAL_CHECKSUM))
1127 seq_puts(seq, ",journal_checksum");
25ec56b5
JNC		 1128 if (test_opt(sb, I_VERSION))
1129 seq_puts(seq, ",i_version");
8b67f04a
TT		 1130 if (!test_opt(sb, DELALLOC) &&
1131 !(def_mount_opts & EXT4_DEFM_NODELALLOC))
dd919b98
AK		 1132 seq_puts(seq, ",nodelalloc");
1133
6fd7a467
TT		 1134 if (!test_opt(sb, MBLK_IO_SUBMIT))
1135 seq_puts(seq, ",nomblk_io_submit");
cb45bbe4
MS		 1136 if (sbi->s_stripe)
1137 seq_printf(seq, ",stripe=%lu", sbi->s_stripe);
aa22df2c
AK		 1138 /*
1139 * journal mode get enabled in different ways
1140 * So just print the value even if we didn't specify it
1141 */
617ba13b 1142 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
ac27a0ec 1143 seq_puts(seq, ",data=journal");
617ba13b 1144 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
ac27a0ec 1145 seq_puts(seq, ",data=ordered");
617ba13b 1146 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
ac27a0ec
DK		 1147 seq_puts(seq, ",data=writeback");
1148
240799cd
TT		 1149 if (sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
1150 seq_printf(seq, ",inode_readahead_blks=%u",
1151 sbi->s_inode_readahead_blks);
1152
5bf5683a
HK		 1153 if (test_opt(sb, DATA_ERR_ABORT))
1154 seq_puts(seq, ",data_err=abort");
1155
afd4672d 1156 if (test_opt(sb, NO_AUTO_DA_ALLOC))
06705bff 1157 seq_puts(seq, ",noauto_da_alloc");
afd4672d 1158
8b67f04a 1159 if (test_opt(sb, DISCARD) && !(def_mount_opts & EXT4_DEFM_DISCARD))
5328e635
ES		 1160 seq_puts(seq, ",discard");
1161
e3bb52ae
ES		 1162 if (test_opt(sb, NOLOAD))
1163 seq_puts(seq, ",norecovery");
1164
744692dc
JZ		 1165 if (test_opt(sb, DIOREAD_NOLOCK))
1166 seq_puts(seq, ",dioread_nolock");
1167
8b67f04a
TT		 1168 if (test_opt(sb, BLOCK_VALIDITY) &&
1169 !(def_mount_opts & EXT4_DEFM_BLOCK_VALIDITY))
1170 seq_puts(seq, ",block_validity");
1171
bfff6873 1172 if (!test_opt(sb, INIT_INODE_TABLE))
fc6cb1cd 1173 seq_puts(seq, ",noinit_itable");
51ce6511 1174 else if (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT)
fc6cb1cd 1175 seq_printf(seq, ",init_itable=%u",
bfff6873
LC		 1176 (unsigned) sbi->s_li_wait_mult);
1177
617ba13b 1178 ext4_show_quota_options(seq, sb);
0b8e58a1 1179
ac27a0ec
DK		 1180 return 0;
1181}
1182
1b961ac0 1183static struct inode *ext4_nfs_get_inode(struct super_block *sb,
0b8e58a1 1184 u64 ino, u32 generation)
ac27a0ec 1185{
ac27a0ec 1186 struct inode *inode;
ac27a0ec 1187
617ba13b 1188 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
ac27a0ec 1189 return ERR_PTR(-ESTALE);
617ba13b 1190 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
ac27a0ec
DK		 1191 return ERR_PTR(-ESTALE);
1192
1193 /* iget isn't really right if the inode is currently unallocated!!
1194 *
617ba13b 1195 * ext4_read_inode will return a bad_inode if the inode had been
ac27a0ec
DK		 1196 * deleted, so we should be safe.
1197 *
1198 * Currently we don't know the generation for parent directory, so
1199 * a generation of 0 means "accept any"
1200 */
1d1fe1ee
DH		 1201 inode = ext4_iget(sb, ino);
1202 if (IS_ERR(inode))
1203 return ERR_CAST(inode);
1204 if (generation && inode->i_generation != generation) {
ac27a0ec
DK		 1205 iput(inode);
1206 return ERR_PTR(-ESTALE);
1207 }
1b961ac0
CH		 1208
1209 return inode;
1210}
1211
1212static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
0b8e58a1 1213 int fh_len, int fh_type)
1b961ac0
CH		 1214{
1215 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
1216 ext4_nfs_get_inode);
1217}
1218
1219static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
0b8e58a1 1220 int fh_len, int fh_type)
1b961ac0
CH		 1221{
1222 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
1223 ext4_nfs_get_inode);
ac27a0ec
DK		 1224}
1225
c39a7f84
TO		 1226/*
1227 * Try to release metadata pages (indirect blocks, directories) which are
1228 * mapped via the block device. Since these pages could have journal heads
1229 * which would prevent try_to_free_buffers() from freeing them, we must use
1230 * jbd2 layer's try_to_free_buffers() function to release them.
1231 */
0b8e58a1
AD		 1232static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
1233 gfp_t wait)
c39a7f84
TO		 1234{
1235 journal_t *journal = EXT4_SB(sb)->s_journal;
1236
1237 WARN_ON(PageChecked(page));
1238 if (!page_has_buffers(page))
1239 return 0;
1240 if (journal)
1241 return jbd2_journal_try_to_free_buffers(journal, page,
1242 wait & ~__GFP_WAIT);
1243 return try_to_free_buffers(page);
1244}
1245
ac27a0ec 1246#ifdef CONFIG_QUOTA
af5bc92d 1247#define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
2b2d6d01 1248#define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
ac27a0ec 1249
617ba13b
MC		 1250static int ext4_write_dquot(struct dquot *dquot);
1251static int ext4_acquire_dquot(struct dquot *dquot);
1252static int ext4_release_dquot(struct dquot *dquot);
1253static int ext4_mark_dquot_dirty(struct dquot *dquot);
1254static int ext4_write_info(struct super_block *sb, int type);
6f28e087 1255static int ext4_quota_on(struct super_block *sb, int type, int format_id,
f00c9e44 1256 struct path *path);
ca0e05e4 1257static int ext4_quota_off(struct super_block *sb, int type);
617ba13b
MC		 1258static int ext4_quota_on_mount(struct super_block *sb, int type);
1259static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec 1260 size_t len, loff_t off);
617ba13b 1261static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec
DK		 1262 const char *data, size_t len, loff_t off);
1263
61e225dc 1264static const struct dquot_operations ext4_quota_operations = {
60e58e0f 1265 .get_reserved_space = ext4_get_reserved_space,
617ba13b
MC		 1266 .write_dquot = ext4_write_dquot,
1267 .acquire_dquot = ext4_acquire_dquot,
1268 .release_dquot = ext4_release_dquot,
1269 .mark_dirty = ext4_mark_dquot_dirty,
a5b5ee32
JK		 1270 .write_info = ext4_write_info,
1271 .alloc_dquot = dquot_alloc,
1272 .destroy_dquot = dquot_destroy,
ac27a0ec
DK		 1273};
1274
0d54b217 1275static const struct quotactl_ops ext4_qctl_operations = {
617ba13b 1276 .quota_on = ext4_quota_on,
ca0e05e4 1277 .quota_off = ext4_quota_off,
287a8095
CH		 1278 .quota_sync = dquot_quota_sync,
1279 .get_info = dquot_get_dqinfo,
1280 .set_info = dquot_set_dqinfo,
1281 .get_dqblk = dquot_get_dqblk,
1282 .set_dqblk = dquot_set_dqblk
ac27a0ec
DK		 1283};
1284#endif
1285
ee9b6d61 1286static const struct super_operations ext4_sops = {
617ba13b
MC		 1287 .alloc_inode = ext4_alloc_inode,
1288 .destroy_inode = ext4_destroy_inode,
617ba13b
MC		 1289 .write_inode = ext4_write_inode,
1290 .dirty_inode = ext4_dirty_inode,
7ff9c073 1291 .drop_inode = ext4_drop_inode,
0930fcc1 1292 .evict_inode = ext4_evict_inode,
617ba13b 1293 .put_super = ext4_put_super,
617ba13b 1294 .sync_fs = ext4_sync_fs,
c4be0c1d
TS		 1295 .freeze_fs = ext4_freeze,
1296 .unfreeze_fs = ext4_unfreeze,
617ba13b
MC		 1297 .statfs = ext4_statfs,
1298 .remount_fs = ext4_remount,
617ba13b 1299 .show_options = ext4_show_options,
ac27a0ec 1300#ifdef CONFIG_QUOTA
617ba13b
MC		 1301 .quota_read = ext4_quota_read,
1302 .quota_write = ext4_quota_write,
ac27a0ec 1303#endif
c39a7f84 1304 .bdev_try_to_free_page = bdev_try_to_free_page,
ac27a0ec
DK		 1305};
1306
9ca92389
TT		 1307static const struct super_operations ext4_nojournal_sops = {
1308 .alloc_inode = ext4_alloc_inode,
1309 .destroy_inode = ext4_destroy_inode,
1310 .write_inode = ext4_write_inode,
1311 .dirty_inode = ext4_dirty_inode,
7ff9c073 1312 .drop_inode = ext4_drop_inode,
0930fcc1 1313 .evict_inode = ext4_evict_inode,
9ca92389
TT		 1314 .write_super = ext4_write_super,
1315 .put_super = ext4_put_super,
1316 .statfs = ext4_statfs,
1317 .remount_fs = ext4_remount,
9ca92389
TT		 1318 .show_options = ext4_show_options,
1319#ifdef CONFIG_QUOTA
1320 .quota_read = ext4_quota_read,
1321 .quota_write = ext4_quota_write,
1322#endif
1323 .bdev_try_to_free_page = bdev_try_to_free_page,
1324};
1325
39655164 1326static const struct export_operations ext4_export_ops = {
1b961ac0
CH		 1327 .fh_to_dentry = ext4_fh_to_dentry,
1328 .fh_to_parent = ext4_fh_to_parent,
617ba13b 1329 .get_parent = ext4_get_parent,
ac27a0ec
DK		 1330};
1331
1332enum {
1333 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
1334 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
01436ef2 1335 Opt_nouid32, Opt_debug, Opt_oldalloc, Opt_orlov,
ac27a0ec 1336 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
06705bff 1337 Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload, Opt_nobh, Opt_bh,
30773840 1338 Opt_commit, Opt_min_batch_time, Opt_max_batch_time,
43e625d8 1339 Opt_journal_dev, Opt_journal_checksum, Opt_journal_async_commit,
ac27a0ec 1340 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
296c355c 1341 Opt_data_err_abort, Opt_data_err_ignore,
ac27a0ec 1342 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
5a20bdfc
JK		 1343 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
1344 Opt_noquota, Opt_ignore, Opt_barrier, Opt_nobarrier, Opt_err,
1345 Opt_resize, Opt_usrquota, Opt_grpquota, Opt_i_version,
1449032b
TT		 1346 Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_mblk_io_submit,
1347 Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity,
5328e635 1348 Opt_inode_readahead_blks, Opt_journal_ioprio,
744692dc 1349 Opt_dioread_nolock, Opt_dioread_lock,
fc6cb1cd 1350 Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable,
ac27a0ec
DK		 1351};
1352
a447c093 1353static const match_table_t tokens = {
ac27a0ec
DK		 1354 {Opt_bsd_df, "bsddf"},
1355 {Opt_minix_df, "minixdf"},
1356 {Opt_grpid, "grpid"},
1357 {Opt_grpid, "bsdgroups"},
1358 {Opt_nogrpid, "nogrpid"},
1359 {Opt_nogrpid, "sysvgroups"},
1360 {Opt_resgid, "resgid=%u"},
1361 {Opt_resuid, "resuid=%u"},
1362 {Opt_sb, "sb=%u"},
1363 {Opt_err_cont, "errors=continue"},
1364 {Opt_err_panic, "errors=panic"},
1365 {Opt_err_ro, "errors=remount-ro"},
1366 {Opt_nouid32, "nouid32"},
ac27a0ec
DK		 1367 {Opt_debug, "debug"},
1368 {Opt_oldalloc, "oldalloc"},
1369 {Opt_orlov, "orlov"},
1370 {Opt_user_xattr, "user_xattr"},
1371 {Opt_nouser_xattr, "nouser_xattr"},
1372 {Opt_acl, "acl"},
1373 {Opt_noacl, "noacl"},
ac27a0ec 1374 {Opt_noload, "noload"},
e3bb52ae 1375 {Opt_noload, "norecovery"},
ac27a0ec
DK		 1376 {Opt_nobh, "nobh"},
1377 {Opt_bh, "bh"},
1378 {Opt_commit, "commit=%u"},
30773840
TT		 1379 {Opt_min_batch_time, "min_batch_time=%u"},
1380 {Opt_max_batch_time, "max_batch_time=%u"},
ac27a0ec 1381 {Opt_journal_dev, "journal_dev=%u"},
818d276c
GS		 1382 {Opt_journal_checksum, "journal_checksum"},
1383 {Opt_journal_async_commit, "journal_async_commit"},
ac27a0ec
DK		 1384 {Opt_abort, "abort"},
1385 {Opt_data_journal, "data=journal"},
1386 {Opt_data_ordered, "data=ordered"},
1387 {Opt_data_writeback, "data=writeback"},
5bf5683a
HK		 1388 {Opt_data_err_abort, "data_err=abort"},
1389 {Opt_data_err_ignore, "data_err=ignore"},
ac27a0ec
DK		 1390 {Opt_offusrjquota, "usrjquota="},
1391 {Opt_usrjquota, "usrjquota=%s"},
1392 {Opt_offgrpjquota, "grpjquota="},
1393 {Opt_grpjquota, "grpjquota=%s"},
1394 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
1395 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
5a20bdfc 1396 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
ac27a0ec
DK		 1397 {Opt_grpquota, "grpquota"},
1398 {Opt_noquota, "noquota"},
1399 {Opt_quota, "quota"},
1400 {Opt_usrquota, "usrquota"},
1401 {Opt_barrier, "barrier=%u"},
06705bff
TT		 1402 {Opt_barrier, "barrier"},
1403 {Opt_nobarrier, "nobarrier"},
25ec56b5 1404 {Opt_i_version, "i_version"},
c9de560d 1405 {Opt_stripe, "stripe=%u"},
ac27a0ec 1406 {Opt_resize, "resize"},
64769240 1407 {Opt_delalloc, "delalloc"},
dd919b98 1408 {Opt_nodelalloc, "nodelalloc"},
1449032b
TT		 1409 {Opt_mblk_io_submit, "mblk_io_submit"},
1410 {Opt_nomblk_io_submit, "nomblk_io_submit"},
6fd058f7
TT		 1411 {Opt_block_validity, "block_validity"},
1412 {Opt_noblock_validity, "noblock_validity"},
240799cd 1413 {Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
b3881f74 1414 {Opt_journal_ioprio, "journal_ioprio=%u"},
afd4672d 1415 {Opt_auto_da_alloc, "auto_da_alloc=%u"},
06705bff
TT		 1416 {Opt_auto_da_alloc, "auto_da_alloc"},
1417 {Opt_noauto_da_alloc, "noauto_da_alloc"},
744692dc
JZ		 1418 {Opt_dioread_nolock, "dioread_nolock"},
1419 {Opt_dioread_lock, "dioread_lock"},
5328e635
ES		 1420 {Opt_discard, "discard"},
1421 {Opt_nodiscard, "nodiscard"},
fc6cb1cd
TT		 1422 {Opt_init_itable, "init_itable=%u"},
1423 {Opt_init_itable, "init_itable"},
1424 {Opt_noinit_itable, "noinit_itable"},
f3f12faa 1425 {Opt_err, NULL},
ac27a0ec
DK		 1426};
1427
617ba13b 1428static ext4_fsblk_t get_sb_block(void **data)
ac27a0ec 1429{
617ba13b 1430 ext4_fsblk_t sb_block;
ac27a0ec
DK		 1431 char *options = (char *) *data;
1432
1433 if (!options || strncmp(options, "sb=", 3) != 0)
1434 return 1; /* Default location */
0b8e58a1 1435
ac27a0ec 1436 options += 3;
0b8e58a1 1437 /* TODO: use simple_strtoll with >32bit ext4 */
ac27a0ec
DK		 1438 sb_block = simple_strtoul(options, &options, 0);
1439 if (*options && *options != ',') {
4776004f 1440 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
ac27a0ec
DK		 1441 (char *) *data);
1442 return 1;
1443 }
1444 if (*options == ',')
1445 options++;
1446 *data = (void *) options;
0b8e58a1 1447
ac27a0ec
DK		 1448 return sb_block;
1449}
1450
b3881f74 1451#define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
437ca0fd
DM		 1452static char deprecated_msg[] = "Mount option \"%s\" will be removed by %s\n"
1453 "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
b3881f74 1454
56c50f11
DM		 1455#ifdef CONFIG_QUOTA
1456static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
1457{
1458 struct ext4_sb_info *sbi = EXT4_SB(sb);
1459 char *qname;
1460
1461 if (sb_any_quota_loaded(sb) &&
1462 !sbi->s_qf_names[qtype]) {
1463 ext4_msg(sb, KERN_ERR,
1464 "Cannot change journaled "
1465 "quota options when quota turned on");
1466 return 0;
1467 }
1468 qname = match_strdup(args);
1469 if (!qname) {
1470 ext4_msg(sb, KERN_ERR,
1471 "Not enough memory for storing quotafile name");
1472 return 0;
1473 }
1474 if (sbi->s_qf_names[qtype] &&
1475 strcmp(sbi->s_qf_names[qtype], qname)) {
1476 ext4_msg(sb, KERN_ERR,
1477 "%s quota file already specified", QTYPE2NAME(qtype));
1478 kfree(qname);
1479 return 0;
1480 }
1481 sbi->s_qf_names[qtype] = qname;
1482 if (strchr(sbi->s_qf_names[qtype], '/')) {
1483 ext4_msg(sb, KERN_ERR,
1484 "quotafile must be on filesystem root");
1485 kfree(sbi->s_qf_names[qtype]);
1486 sbi->s_qf_names[qtype] = NULL;
1487 return 0;
1488 }
fd8c37ec 1489 set_opt(sb, QUOTA);
56c50f11
DM		 1490 return 1;
1491}
1492
1493static int clear_qf_name(struct super_block *sb, int qtype)
1494{
1495
1496 struct ext4_sb_info *sbi = EXT4_SB(sb);
1497
1498 if (sb_any_quota_loaded(sb) &&
1499 sbi->s_qf_names[qtype]) {
1500 ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options"
1501 " when quota turned on");
1502 return 0;
1503 }
1504 /*
1505 * The space will be released later when all options are confirmed
1506 * to be correct
1507 */
1508 sbi->s_qf_names[qtype] = NULL;
1509 return 1;
1510}
1511#endif
1512
2b2d6d01 1513static int parse_options(char *options, struct super_block *sb,
c3191067 1514 unsigned long *journal_devnum,
b3881f74 1515 unsigned int *journal_ioprio,
2b2d6d01 1516 ext4_fsblk_t *n_blocks_count, int is_remount)
ac27a0ec 1517{
617ba13b 1518 struct ext4_sb_info *sbi = EXT4_SB(sb);
2b2d6d01 1519 char *p;
ac27a0ec
DK		 1520 substring_t args[MAX_OPT_ARGS];
1521 int data_opt = 0;
1522 int option;
1523#ifdef CONFIG_QUOTA
56c50f11 1524 int qfmt;
ac27a0ec
DK		 1525#endif
1526
1527 if (!options)
1528 return 1;
1529
2b2d6d01 1530 while ((p = strsep(&options, ",")) != NULL) {
ac27a0ec
DK		 1531 int token;
1532 if (!*p)
1533 continue;
1534
15121c18
ES		 1535 /*
1536 * Initialize args struct so we know whether arg was
1537 * found; some options take optional arguments.
1538 */
7dc57615 1539 args[0].to = args[0].from = NULL;
ac27a0ec
DK		 1540 token = match_token(p, tokens, args);
1541 switch (token) {
1542 case Opt_bsd_df:
437ca0fd 1543 ext4_msg(sb, KERN_WARNING, deprecated_msg, p, "2.6.38");
fd8c37ec 1544 clear_opt(sb, MINIX_DF);
ac27a0ec
DK		 1545 break;
1546 case Opt_minix_df:
437ca0fd 1547 ext4_msg(sb, KERN_WARNING, deprecated_msg, p, "2.6.38");
fd8c37ec 1548 set_opt(sb, MINIX_DF);
437ca0fd 1549
ac27a0ec
DK		 1550 break;
1551 case Opt_grpid:
437ca0fd 1552 ext4_msg(sb, KERN_WARNING, deprecated_msg, p, "2.6.38");
fd8c37ec 1553 set_opt(sb, GRPID);
437ca0fd 1554
ac27a0ec
DK		 1555 break;
1556 case Opt_nogrpid:
437ca0fd 1557 ext4_msg(sb, KERN_WARNING, deprecated_msg, p, "2.6.38");
fd8c37ec 1558 clear_opt(sb, GRPID);
437ca0fd 1559
ac27a0ec
DK		 1560 break;
1561 case Opt_resuid:
1562 if (match_int(&args[0], &option))
1563 return 0;
1564 sbi->s_resuid = option;
1565 break;
1566 case Opt_resgid:
1567 if (match_int(&args[0], &option))
1568 return 0;
1569 sbi->s_resgid = option;
1570 break;
1571 case Opt_sb:
1572 /* handled by get_sb_block() instead of here */
1573 /* *sb_block = match_int(&args[0]); */
1574 break;
1575 case Opt_err_panic:
fd8c37ec
TT		 1576 clear_opt(sb, ERRORS_CONT);
1577 clear_opt(sb, ERRORS_RO);
1578 set_opt(sb, ERRORS_PANIC);
ac27a0ec
DK		 1579 break;
1580 case Opt_err_ro:
fd8c37ec
TT		 1581 clear_opt(sb, ERRORS_CONT);
1582 clear_opt(sb, ERRORS_PANIC);
1583 set_opt(sb, ERRORS_RO);
ac27a0ec
DK		 1584 break;
1585 case Opt_err_cont:
fd8c37ec
TT		 1586 clear_opt(sb, ERRORS_RO);
1587 clear_opt(sb, ERRORS_PANIC);
1588 set_opt(sb, ERRORS_CONT);
ac27a0ec
DK		 1589 break;
1590 case Opt_nouid32:
fd8c37ec 1591 set_opt(sb, NO_UID32);
ac27a0ec 1592 break;
ac27a0ec 1593 case Opt_debug:
fd8c37ec 1594 set_opt(sb, DEBUG);
ac27a0ec
DK		 1595 break;
1596 case Opt_oldalloc:
4113c4ca
LC		 1597 ext4_msg(sb, KERN_WARNING,
1598 "Ignoring deprecated oldalloc option");
ac27a0ec
DK		 1599 break;
1600 case Opt_orlov:
4113c4ca
LC		 1601 ext4_msg(sb, KERN_WARNING,
1602 "Ignoring deprecated orlov option");
ac27a0ec 1603 break;
03010a33 1604#ifdef CONFIG_EXT4_FS_XATTR
ac27a0ec 1605 case Opt_user_xattr:
fd8c37ec 1606 set_opt(sb, XATTR_USER);
ac27a0ec
DK		 1607 break;
1608 case Opt_nouser_xattr:
fd8c37ec 1609 clear_opt(sb, XATTR_USER);
ac27a0ec
DK		 1610 break;
1611#else
1612 case Opt_user_xattr:
1613 case Opt_nouser_xattr:
b31e1552 1614 ext4_msg(sb, KERN_ERR, "(no)user_xattr options not supported");
ac27a0ec
DK		 1615 break;
1616#endif
03010a33 1617#ifdef CONFIG_EXT4_FS_POSIX_ACL
ac27a0ec 1618 case Opt_acl:
fd8c37ec 1619 set_opt(sb, POSIX_ACL);
ac27a0ec
DK		 1620 break;
1621 case Opt_noacl:
fd8c37ec 1622 clear_opt(sb, POSIX_ACL);
ac27a0ec
DK		 1623 break;
1624#else
1625 case Opt_acl:
1626 case Opt_noacl:
b31e1552 1627 ext4_msg(sb, KERN_ERR, "(no)acl options not supported");
ac27a0ec
DK		 1628 break;
1629#endif
ac27a0ec
DK		 1630 case Opt_journal_dev:
1631 if (is_remount) {
b31e1552
ES		 1632 ext4_msg(sb, KERN_ERR,
1633 "Cannot specify journal on remount");
ac27a0ec
DK		 1634 return 0;
1635 }
1636 if (match_int(&args[0], &option))
1637 return 0;
1638 *journal_devnum = option;
1639 break;
818d276c 1640 case Opt_journal_checksum:
fd8c37ec 1641 set_opt(sb, JOURNAL_CHECKSUM);
d4da6c9c 1642 break;
818d276c 1643 case Opt_journal_async_commit:
fd8c37ec
TT		 1644 set_opt(sb, JOURNAL_ASYNC_COMMIT);
1645 set_opt(sb, JOURNAL_CHECKSUM);
818d276c 1646 break;
ac27a0ec 1647 case Opt_noload:
fd8c37ec 1648 set_opt(sb, NOLOAD);
ac27a0ec
DK		 1649 break;
1650 case Opt_commit:
1651 if (match_int(&args[0], &option))
1652 return 0;
1653 if (option < 0)
1654 return 0;
1655 if (option == 0)
cd02ff0b 1656 option = JBD2_DEFAULT_MAX_COMMIT_AGE;
ac27a0ec
DK		 1657 sbi->s_commit_interval = HZ * option;
1658 break;
30773840
TT		 1659 case Opt_max_batch_time:
1660 if (match_int(&args[0], &option))
1661 return 0;
1662 if (option < 0)
1663 return 0;
1664 if (option == 0)
1665 option = EXT4_DEF_MAX_BATCH_TIME;
1666 sbi->s_max_batch_time = option;
1667 break;
1668 case Opt_min_batch_time:
1669 if (match_int(&args[0], &option))
1670 return 0;
1671 if (option < 0)
1672 return 0;
1673 sbi->s_min_batch_time = option;
1674 break;
ac27a0ec 1675 case Opt_data_journal:
617ba13b 1676 data_opt = EXT4_MOUNT_JOURNAL_DATA;
ac27a0ec
DK		 1677 goto datacheck;
1678 case Opt_data_ordered:
617ba13b 1679 data_opt = EXT4_MOUNT_ORDERED_DATA;
ac27a0ec
DK		 1680 goto datacheck;
1681 case Opt_data_writeback:
617ba13b 1682 data_opt = EXT4_MOUNT_WRITEBACK_DATA;
ac27a0ec
DK		 1683 datacheck:
1684 if (is_remount) {
eb513689
TT		 1685 if (!sbi->s_journal)
1686 ext4_msg(sb, KERN_WARNING, "Remounting file system with no journal so ignoring journalled data option");
1687 else if (test_opt(sb, DATA_FLAGS) != data_opt) {
b31e1552
ES		 1688 ext4_msg(sb, KERN_ERR,
1689 "Cannot change data mode on remount");
ac27a0ec
DK		 1690 return 0;
1691 }
1692 } else {
fd8c37ec 1693 clear_opt(sb, DATA_FLAGS);
ac27a0ec
DK		 1694 sbi->s_mount_opt |= data_opt;
1695 }
1696 break;
5bf5683a 1697 case Opt_data_err_abort:
fd8c37ec 1698 set_opt(sb, DATA_ERR_ABORT);
5bf5683a
HK		 1699 break;
1700 case Opt_data_err_ignore:
fd8c37ec 1701 clear_opt(sb, DATA_ERR_ABORT);
5bf5683a 1702 break;
ac27a0ec
DK		 1703#ifdef CONFIG_QUOTA
1704 case Opt_usrjquota:
56c50f11 1705 if (!set_qf_name(sb, USRQUOTA, &args[0]))
ac27a0ec 1706 return 0;
56c50f11
DM		 1707 break;
1708 case Opt_grpjquota:
1709 if (!set_qf_name(sb, GRPQUOTA, &args[0]))
ac27a0ec 1710 return 0;
ac27a0ec
DK		 1711 break;
1712 case Opt_offusrjquota:
56c50f11
DM		 1713 if (!clear_qf_name(sb, USRQUOTA))
1714 return 0;
1715 break;
ac27a0ec 1716 case Opt_offgrpjquota:
56c50f11 1717 if (!clear_qf_name(sb, GRPQUOTA))
ac27a0ec 1718 return 0;
ac27a0ec 1719 break;
56c50f11 1720
ac27a0ec 1721 case Opt_jqfmt_vfsold:
dfc5d03f
JK		 1722 qfmt = QFMT_VFS_OLD;
1723 goto set_qf_format;
ac27a0ec 1724 case Opt_jqfmt_vfsv0:
dfc5d03f 1725 qfmt = QFMT_VFS_V0;
5a20bdfc
JK		 1726 goto set_qf_format;
1727 case Opt_jqfmt_vfsv1:
1728 qfmt = QFMT_VFS_V1;
dfc5d03f 1729set_qf_format:
17bd13b3 1730 if (sb_any_quota_loaded(sb) &&
dfc5d03f 1731 sbi->s_jquota_fmt != qfmt) {
b31e1552 1732 ext4_msg(sb, KERN_ERR, "Cannot change "
dfc5d03f 1733 "journaled quota options when "
b31e1552 1734 "quota turned on");
dfc5d03f
JK		 1735 return 0;
1736 }
1737 sbi->s_jquota_fmt = qfmt;
ac27a0ec
DK		 1738 break;
1739 case Opt_quota:
1740 case Opt_usrquota:
fd8c37ec
TT		 1741 set_opt(sb, QUOTA);
1742 set_opt(sb, USRQUOTA);
ac27a0ec
DK		 1743 break;
1744 case Opt_grpquota:
fd8c37ec
TT		 1745 set_opt(sb, QUOTA);
1746 set_opt(sb, GRPQUOTA);
ac27a0ec
DK		 1747 break;
1748 case Opt_noquota:
17bd13b3 1749 if (sb_any_quota_loaded(sb)) {
b31e1552
ES		 1750 ext4_msg(sb, KERN_ERR, "Cannot change quota "
1751 "options when quota turned on");
ac27a0ec
DK		 1752 return 0;
1753 }
fd8c37ec
TT		 1754 clear_opt(sb, QUOTA);
1755 clear_opt(sb, USRQUOTA);
1756 clear_opt(sb, GRPQUOTA);
ac27a0ec
DK		 1757 break;
1758#else
1759 case Opt_quota:
1760 case Opt_usrquota:
1761 case Opt_grpquota:
b31e1552
ES		 1762 ext4_msg(sb, KERN_ERR,
1763 "quota options not supported");
cd59e7b9 1764 break;
ac27a0ec
DK		 1765 case Opt_usrjquota:
1766 case Opt_grpjquota:
1767 case Opt_offusrjquota:
1768 case Opt_offgrpjquota:
1769 case Opt_jqfmt_vfsold:
1770 case Opt_jqfmt_vfsv0:
5a20bdfc 1771 case Opt_jqfmt_vfsv1:
b31e1552
ES		 1772 ext4_msg(sb, KERN_ERR,
1773 "journaled quota options not supported");
ac27a0ec
DK		 1774 break;
1775 case Opt_noquota:
1776 break;
1777#endif
1778 case Opt_abort:
4ab2f15b 1779 sbi->s_mount_flags |= EXT4_MF_FS_ABORTED;
ac27a0ec 1780 break;
06705bff 1781 case Opt_nobarrier:
fd8c37ec 1782 clear_opt(sb, BARRIER);
06705bff 1783 break;
ac27a0ec 1784 case Opt_barrier:
15121c18
ES		 1785 if (args[0].from) {
1786 if (match_int(&args[0], &option))
1787 return 0;
1788 } else
1789 option = 1; /* No argument, default to 1 */
ac27a0ec 1790 if (option)
fd8c37ec 1791 set_opt(sb, BARRIER);
ac27a0ec 1792 else
fd8c37ec 1793 clear_opt(sb, BARRIER);
ac27a0ec
DK		 1794 break;
1795 case Opt_ignore:
1796 break;
1797 case Opt_resize:
1798 if (!is_remount) {
b31e1552
ES		 1799 ext4_msg(sb, KERN_ERR,
1800 "resize option only available "
1801 "for remount");
ac27a0ec
DK		 1802 return 0;
1803 }
1804 if (match_int(&args[0], &option) != 0)
1805 return 0;
1806 *n_blocks_count = option;
1807 break;
1808 case Opt_nobh:
206f7ab4
CH		 1809 ext4_msg(sb, KERN_WARNING,
1810 "Ignoring deprecated nobh option");
ac27a0ec
DK		 1811 break;
1812 case Opt_bh:
206f7ab4
CH		 1813 ext4_msg(sb, KERN_WARNING,
1814 "Ignoring deprecated bh option");
ac27a0ec 1815 break;
25ec56b5 1816 case Opt_i_version:
fd8c37ec 1817 set_opt(sb, I_VERSION);
25ec56b5
JNC		 1818 sb->s_flags |= MS_I_VERSION;
1819 break;
dd919b98 1820 case Opt_nodelalloc:
fd8c37ec 1821 clear_opt(sb, DELALLOC);
56889787 1822 clear_opt2(sb, EXPLICIT_DELALLOC);
dd919b98 1823 break;
1449032b 1824 case Opt_mblk_io_submit:
fd8c37ec 1825 set_opt(sb, MBLK_IO_SUBMIT);
1449032b
TT		 1826 break;
1827 case Opt_nomblk_io_submit:
fd8c37ec 1828 clear_opt(sb, MBLK_IO_SUBMIT);
1449032b 1829 break;
c9de560d
AT		 1830 case Opt_stripe:
1831 if (match_int(&args[0], &option))
1832 return 0;
1833 if (option < 0)
1834 return 0;
1835 sbi->s_stripe = option;
1836 break;
64769240 1837 case Opt_delalloc:
fd8c37ec 1838 set_opt(sb, DELALLOC);
56889787 1839 set_opt2(sb, EXPLICIT_DELALLOC);
64769240 1840 break;
6fd058f7 1841 case Opt_block_validity:
fd8c37ec 1842 set_opt(sb, BLOCK_VALIDITY);
6fd058f7
TT		 1843 break;
1844 case Opt_noblock_validity:
fd8c37ec 1845 clear_opt(sb, BLOCK_VALIDITY);
6fd058f7 1846 break;
240799cd
TT		 1847 case Opt_inode_readahead_blks:
1848 if (match_int(&args[0], &option))
1849 return 0;
1850 if (option < 0 || option > (1 << 30))
1851 return 0;
5dbd571d 1852 if (option && !is_power_of_2(option)) {
b31e1552
ES		 1853 ext4_msg(sb, KERN_ERR,
1854 "EXT4-fs: inode_readahead_blks"
1855 " must be a power of 2");
3197ebdb
TT		 1856 return 0;
1857 }
240799cd
TT		 1858 sbi->s_inode_readahead_blks = option;
1859 break;
b3881f74
TT		 1860 case Opt_journal_ioprio:
1861 if (match_int(&args[0], &option))
1862 return 0;
1863 if (option < 0 || option > 7)
1864 break;
1865 *journal_ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE,
1866 option);
1867 break;
06705bff 1868 case Opt_noauto_da_alloc:
fd8c37ec 1869 set_opt(sb, NO_AUTO_DA_ALLOC);
06705bff 1870 break;
afd4672d 1871 case Opt_auto_da_alloc:
15121c18
ES		 1872 if (args[0].from) {
1873 if (match_int(&args[0], &option))
1874 return 0;
1875 } else
1876 option = 1; /* No argument, default to 1 */
afd4672d 1877 if (option)
fd8c37ec 1878 clear_opt(sb, NO_AUTO_DA_ALLOC);
afd4672d 1879 else
fd8c37ec 1880 set_opt(sb,NO_AUTO_DA_ALLOC);
afd4672d 1881 break;
5328e635 1882 case Opt_discard:
fd8c37ec 1883 set_opt(sb, DISCARD);
5328e635
ES		 1884 break;
1885 case Opt_nodiscard:
fd8c37ec 1886 clear_opt(sb, DISCARD);
5328e635 1887 break;
744692dc 1888 case Opt_dioread_nolock:
fd8c37ec 1889 set_opt(sb, DIOREAD_NOLOCK);
744692dc
JZ		 1890 break;
1891 case Opt_dioread_lock:
fd8c37ec 1892 clear_opt(sb, DIOREAD_NOLOCK);
744692dc 1893 break;
fc6cb1cd 1894 case Opt_init_itable:
fd8c37ec 1895 set_opt(sb, INIT_INODE_TABLE);
bfff6873
LC		 1896 if (args[0].from) {
1897 if (match_int(&args[0], &option))
1898 return 0;
1899 } else
1900 option = EXT4_DEF_LI_WAIT_MULT;
1901 if (option < 0)
1902 return 0;
1903 sbi->s_li_wait_mult = option;
1904 break;
fc6cb1cd 1905 case Opt_noinit_itable:
fd8c37ec 1906 clear_opt(sb, INIT_INODE_TABLE);
bfff6873 1907 break;
ac27a0ec 1908 default:
b31e1552
ES		 1909 ext4_msg(sb, KERN_ERR,
1910 "Unrecognized mount option \"%s\" "
1911 "or missing value", p);
ac27a0ec
DK		 1912 return 0;
1913 }
1914 }
1915#ifdef CONFIG_QUOTA
1916 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
482a7425 1917 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
fd8c37ec 1918 clear_opt(sb, USRQUOTA);
ac27a0ec 1919
482a7425 1920 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
fd8c37ec 1921 clear_opt(sb, GRPQUOTA);
ac27a0ec 1922
56c50f11 1923 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
b31e1552
ES		 1924 ext4_msg(sb, KERN_ERR, "old and new quota "
1925 "format mixing");
ac27a0ec
DK		 1926 return 0;
1927 }
1928
1929 if (!sbi->s_jquota_fmt) {
b31e1552
ES		 1930 ext4_msg(sb, KERN_ERR, "journaled quota format "
1931 "not specified");
ac27a0ec
DK		 1932 return 0;
1933 }
1934 } else {
1935 if (sbi->s_jquota_fmt) {
b31e1552 1936 ext4_msg(sb, KERN_ERR, "journaled quota format "
2c8be6b2 1937 "specified with no journaling "
b31e1552 1938 "enabled");
ac27a0ec
DK		 1939 return 0;
1940 }
1941 }
1942#endif
1943 return 1;
1944}
1945
617ba13b 1946static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
ac27a0ec
DK		 1947 int read_only)
1948{
617ba13b 1949 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec
DK		 1950 int res = 0;
1951
617ba13b 1952 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
b31e1552
ES		 1953 ext4_msg(sb, KERN_ERR, "revision level too high, "
1954 "forcing read-only mode");
ac27a0ec
DK		 1955 res = MS_RDONLY;
1956 }
1957 if (read_only)
281b5995 1958 goto done;
617ba13b 1959 if (!(sbi->s_mount_state & EXT4_VALID_FS))
b31e1552
ES		 1960 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
1961 "running e2fsck is recommended");
617ba13b 1962 else if ((sbi->s_mount_state & EXT4_ERROR_FS))
b31e1552
ES		 1963 ext4_msg(sb, KERN_WARNING,
1964 "warning: mounting fs with errors, "
1965 "running e2fsck is recommended");
ed3ce80a 1966 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
ac27a0ec
DK		 1967 le16_to_cpu(es->s_mnt_count) >=
1968 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
b31e1552
ES		 1969 ext4_msg(sb, KERN_WARNING,
1970 "warning: maximal mount count reached, "
1971 "running e2fsck is recommended");
ac27a0ec
DK		 1972 else if (le32_to_cpu(es->s_checkinterval) &&
1973 (le32_to_cpu(es->s_lastcheck) +
1974 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
b31e1552
ES		 1975 ext4_msg(sb, KERN_WARNING,
1976 "warning: checktime reached, "
1977 "running e2fsck is recommended");
0b8e58a1 1978 if (!sbi->s_journal)
0390131b 1979 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
ac27a0ec 1980 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
617ba13b 1981 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
e8546d06 1982 le16_add_cpu(&es->s_mnt_count, 1);
ac27a0ec 1983 es->s_mtime = cpu_to_le32(get_seconds());
617ba13b 1984 ext4_update_dynamic_rev(sb);
0390131b
FM		 1985 if (sbi->s_journal)
1986 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
ac27a0ec 1987
e2d67052 1988 ext4_commit_super(sb, 1);
281b5995 1989done:
ac27a0ec 1990 if (test_opt(sb, DEBUG))
a9df9a49 1991 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
a2595b8a 1992 "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
ac27a0ec
DK		 1993 sb->s_blocksize,
1994 sbi->s_groups_count,
617ba13b
MC		 1995 EXT4_BLOCKS_PER_GROUP(sb),
1996 EXT4_INODES_PER_GROUP(sb),
a2595b8a 1997 sbi->s_mount_opt, sbi->s_mount_opt2);
ac27a0ec 1998
7abc52c2 1999 cleancache_init_fs(sb);
ac27a0ec
DK		 2000 return res;
2001}
2002
772cb7c8
JS		 2003static int ext4_fill_flex_info(struct super_block *sb)
2004{
2005 struct ext4_sb_info *sbi = EXT4_SB(sb);
2006 struct ext4_group_desc *gdp = NULL;
772cb7c8
JS		 2007 ext4_group_t flex_group_count;
2008 ext4_group_t flex_group;
d50f2ab6 2009 unsigned int groups_per_flex = 0;
c5ca7c76 2010 size_t size;
772cb7c8
JS		 2011 int i;
2012
503358ae 2013 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
d50f2ab6 2014 if (sbi->s_log_groups_per_flex < 1 || sbi->s_log_groups_per_flex > 31) {
772cb7c8
JS		 2015 sbi->s_log_groups_per_flex = 0;
2016 return 1;
2017 }
d50f2ab6 2018 groups_per_flex = 1 << sbi->s_log_groups_per_flex;
772cb7c8 2019
c62a11fd
FB		 2020 /* We allocate both existing and potentially added groups */
2021 flex_group_count = ((sbi->s_groups_count + groups_per_flex - 1) +
d94e99a6
AK		 2022 ((le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) + 1) <<
2023 EXT4_DESC_PER_BLOCK_BITS(sb))) / groups_per_flex;
c5ca7c76 2024 size = flex_group_count * sizeof(struct flex_groups);
9933fc0a 2025 sbi->s_flex_groups = ext4_kvzalloc(size, GFP_KERNEL);
c5ca7c76 2026 if (sbi->s_flex_groups == NULL) {
9933fc0a
TT		 2027 ext4_msg(sb, KERN_ERR, "not enough memory for %u flex groups",
2028 flex_group_count);
2029 goto failed;
772cb7c8 2030 }
772cb7c8 2031
772cb7c8 2032 for (i = 0; i < sbi->s_groups_count; i++) {
88b6edd1 2033 gdp = ext4_get_group_desc(sb, i, NULL);
772cb7c8
JS		 2034
2035 flex_group = ext4_flex_group(sbi, i);
7ad9bb65
TT		 2036 atomic_add(ext4_free_inodes_count(sb, gdp),
2037 &sbi->s_flex_groups[flex_group].free_inodes);
021b65bb 2038 atomic_add(ext4_free_group_clusters(sb, gdp),
24aaa8ef 2039 &sbi->s_flex_groups[flex_group].free_clusters);
7ad9bb65
TT		 2040 atomic_add(ext4_used_dirs_count(sb, gdp),
2041 &sbi->s_flex_groups[flex_group].used_dirs);
772cb7c8
JS		 2042 }
2043
2044 return 1;
2045failed:
2046 return 0;
2047}
2048
717d50e4
AD		 2049__le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
2050 struct ext4_group_desc *gdp)
2051{
2052 __u16 crc = 0;
2053
2054 if (sbi->s_es->s_feature_ro_compat &
2055 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) {
2056 int offset = offsetof(struct ext4_group_desc, bg_checksum);
2057 __le32 le_group = cpu_to_le32(block_group);
2058
2059 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
2060 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
2061 crc = crc16(crc, (__u8 *)gdp, offset);
2062 offset += sizeof(gdp->bg_checksum); /* skip checksum */
2063 /* for checksum of struct ext4_group_desc do the rest...*/
2064 if ((sbi->s_es->s_feature_incompat &
2065 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) &&
2066 offset < le16_to_cpu(sbi->s_es->s_desc_size))
2067 crc = crc16(crc, (__u8 *)gdp + offset,
2068 le16_to_cpu(sbi->s_es->s_desc_size) -
2069 offset);
2070 }
2071
2072 return cpu_to_le16(crc);
2073}
2074
2075int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 block_group,
2076 struct ext4_group_desc *gdp)
2077{
2078 if ((sbi->s_es->s_feature_ro_compat &
2079 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) &&
2080 (gdp->bg_checksum != ext4_group_desc_csum(sbi, block_group, gdp)))
2081 return 0;
2082
2083 return 1;
2084}
2085
ac27a0ec 2086/* Called at mount-time, super-block is locked */
bfff6873
LC		 2087static int ext4_check_descriptors(struct super_block *sb,
2088 ext4_group_t *first_not_zeroed)
ac27a0ec 2089{
617ba13b
MC		 2090 struct ext4_sb_info *sbi = EXT4_SB(sb);
2091 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
2092 ext4_fsblk_t last_block;
bd81d8ee
LV		 2093 ext4_fsblk_t block_bitmap;
2094 ext4_fsblk_t inode_bitmap;
2095 ext4_fsblk_t inode_table;
ce421581 2096 int flexbg_flag = 0;
bfff6873 2097 ext4_group_t i, grp = sbi->s_groups_count;
ac27a0ec 2098
ce421581
JS		 2099 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
2100 flexbg_flag = 1;
2101
af5bc92d 2102 ext4_debug("Checking group descriptors");
ac27a0ec 2103
197cd65a
AM		 2104 for (i = 0; i < sbi->s_groups_count; i++) {
2105 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
2106
ce421581 2107 if (i == sbi->s_groups_count - 1 || flexbg_flag)
bd81d8ee 2108 last_block = ext4_blocks_count(sbi->s_es) - 1;
ac27a0ec
DK		 2109 else
2110 last_block = first_block +
617ba13b 2111 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
ac27a0ec 2112
bfff6873
LC		 2113 if ((grp == sbi->s_groups_count) &&
2114 !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2115 grp = i;
2116
8fadc143 2117 block_bitmap = ext4_block_bitmap(sb, gdp);
2b2d6d01 2118 if (block_bitmap < first_block || block_bitmap > last_block) {
b31e1552 2119 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2120 "Block bitmap for group %u not in group "
b31e1552 2121 "(block %llu)!", i, block_bitmap);
ac27a0ec
DK		 2122 return 0;
2123 }
8fadc143 2124 inode_bitmap = ext4_inode_bitmap(sb, gdp);
2b2d6d01 2125 if (inode_bitmap < first_block || inode_bitmap > last_block) {
b31e1552 2126 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2127 "Inode bitmap for group %u not in group "
b31e1552 2128 "(block %llu)!", i, inode_bitmap);
ac27a0ec
DK		 2129 return 0;
2130 }
8fadc143 2131 inode_table = ext4_inode_table(sb, gdp);
bd81d8ee 2132 if (inode_table < first_block ||
2b2d6d01 2133 inode_table + sbi->s_itb_per_group - 1 > last_block) {
b31e1552 2134 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2135 "Inode table for group %u not in group "
b31e1552 2136 "(block %llu)!", i, inode_table);
ac27a0ec
DK		 2137 return 0;
2138 }
955ce5f5 2139 ext4_lock_group(sb, i);
717d50e4 2140 if (!ext4_group_desc_csum_verify(sbi, i, gdp)) {
b31e1552
ES		 2141 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2142 "Checksum for group %u failed (%u!=%u)",
2143 i, le16_to_cpu(ext4_group_desc_csum(sbi, i,
2144 gdp)), le16_to_cpu(gdp->bg_checksum));
7ee1ec4c 2145 if (!(sb->s_flags & MS_RDONLY)) {
955ce5f5 2146 ext4_unlock_group(sb, i);
8a266467 2147 return 0;
7ee1ec4c 2148 }
717d50e4 2149 }
955ce5f5 2150 ext4_unlock_group(sb, i);
ce421581
JS		 2151 if (!flexbg_flag)
2152 first_block += EXT4_BLOCKS_PER_GROUP(sb);
ac27a0ec 2153 }
bfff6873
LC		 2154 if (NULL != first_not_zeroed)
2155 *first_not_zeroed = grp;
ac27a0ec 2156
5dee5437
TT		 2157 ext4_free_blocks_count_set(sbi->s_es,
2158 EXT4_C2B(sbi, ext4_count_free_clusters(sb)));
0b8e58a1 2159 sbi->s_es->s_free_inodes_count =cpu_to_le32(ext4_count_free_inodes(sb));
ac27a0ec
DK		 2160 return 1;
2161}
2162
617ba13b 2163/* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
ac27a0ec
DK		 2164 * the superblock) which were deleted from all directories, but held open by
2165 * a process at the time of a crash. We walk the list and try to delete these
2166 * inodes at recovery time (only with a read-write filesystem).
2167 *
2168 * In order to keep the orphan inode chain consistent during traversal (in
2169 * case of crash during recovery), we link each inode into the superblock
2170 * orphan list_head and handle it the same way as an inode deletion during
2171 * normal operation (which journals the operations for us).
2172 *
2173 * We only do an iget() and an iput() on each inode, which is very safe if we
2174 * accidentally point at an in-use or already deleted inode. The worst that
2175 * can happen in this case is that we get a "bit already cleared" message from
617ba13b 2176 * ext4_free_inode(). The only reason we would point at a wrong inode is if
ac27a0ec
DK		 2177 * e2fsck was run on this filesystem, and it must have already done the orphan
2178 * inode cleanup for us, so we can safely abort without any further action.
2179 */
2b2d6d01
TT		 2180static void ext4_orphan_cleanup(struct super_block *sb,
2181 struct ext4_super_block *es)
ac27a0ec
DK		 2182{
2183 unsigned int s_flags = sb->s_flags;
2184 int nr_orphans = 0, nr_truncates = 0;
2185#ifdef CONFIG_QUOTA
2186 int i;
2187#endif
2188 if (!es->s_last_orphan) {
2189 jbd_debug(4, "no orphan inodes to clean up\n");
2190 return;
2191 }
2192
a8f48a95 2193 if (bdev_read_only(sb->s_bdev)) {
b31e1552
ES		 2194 ext4_msg(sb, KERN_ERR, "write access "
2195 "unavailable, skipping orphan cleanup");
a8f48a95
ES		 2196 return;
2197 }
2198
d39195c3
AG		 2199 /* Check if feature set would not allow a r/w mount */
2200 if (!ext4_feature_set_ok(sb, 0)) {
2201 ext4_msg(sb, KERN_INFO, "Skipping orphan cleanup due to "
2202 "unknown ROCOMPAT features");
2203 return;
2204 }
2205
617ba13b 2206 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
ac27a0ec
DK		 2207 if (es->s_last_orphan)
2208 jbd_debug(1, "Errors on filesystem, "
2209 "clearing orphan list.\n");
2210 es->s_last_orphan = 0;
2211 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2212 return;
2213 }
2214
2215 if (s_flags & MS_RDONLY) {
b31e1552 2216 ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
ac27a0ec
DK		 2217 sb->s_flags &= ~MS_RDONLY;
2218 }
2219#ifdef CONFIG_QUOTA
2220 /* Needed for iput() to work correctly and not trash data */
2221 sb->s_flags |= MS_ACTIVE;
2222 /* Turn on quotas so that they are updated correctly */
2223 for (i = 0; i < MAXQUOTAS; i++) {
617ba13b
MC		 2224 if (EXT4_SB(sb)->s_qf_names[i]) {
2225 int ret = ext4_quota_on_mount(sb, i);
ac27a0ec 2226 if (ret < 0)
b31e1552
ES		 2227 ext4_msg(sb, KERN_ERR,
2228 "Cannot turn on journaled "
2229 "quota: error %d", ret);
ac27a0ec
DK		 2230 }
2231 }
2232#endif
2233
2234 while (es->s_last_orphan) {
2235 struct inode *inode;
2236
97bd42b9
JB		 2237 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
2238 if (IS_ERR(inode)) {
ac27a0ec
DK		 2239 es->s_last_orphan = 0;
2240 break;
2241 }
2242
617ba13b 2243 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
871a2931 2244 dquot_initialize(inode);
ac27a0ec 2245 if (inode->i_nlink) {
b31e1552
ES		 2246 ext4_msg(sb, KERN_DEBUG,
2247 "%s: truncating inode %lu to %lld bytes",
46e665e9 2248 __func__, inode->i_ino, inode->i_size);
e5f8eab8 2249 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
ac27a0ec 2250 inode->i_ino, inode->i_size);
617ba13b 2251 ext4_truncate(inode);
ac27a0ec
DK		 2252 nr_truncates++;
2253 } else {
b31e1552
ES		 2254 ext4_msg(sb, KERN_DEBUG,
2255 "%s: deleting unreferenced inode %lu",
46e665e9 2256 __func__, inode->i_ino);
ac27a0ec
DK		 2257 jbd_debug(2, "deleting unreferenced inode %lu\n",
2258 inode->i_ino);
2259 nr_orphans++;
2260 }
2261 iput(inode); /* The delete magic happens here! */
2262 }
2263
2b2d6d01 2264#define PLURAL(x) (x), ((x) == 1) ? "" : "s"
ac27a0ec
DK		 2265
2266 if (nr_orphans)
b31e1552
ES		 2267 ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
2268 PLURAL(nr_orphans));
ac27a0ec 2269 if (nr_truncates)
b31e1552
ES		 2270 ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
2271 PLURAL(nr_truncates));
ac27a0ec
DK		 2272#ifdef CONFIG_QUOTA
2273 /* Turn quotas off */
2274 for (i = 0; i < MAXQUOTAS; i++) {
2275 if (sb_dqopt(sb)->files[i])
287a8095 2276 dquot_quota_off(sb, i);
ac27a0ec
DK		 2277 }
2278#endif
2279 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
2280}
0b8e58a1 2281
cd2291a4
ES		 2282/*
2283 * Maximal extent format file size.
2284 * Resulting logical blkno at s_maxbytes must fit in our on-disk
2285 * extent format containers, within a sector_t, and within i_blocks
2286 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
2287 * so that won't be a limiting factor.
2288 *
f17722f9
LC		 2289 * However there is other limiting factor. We do store extents in the form
2290 * of starting block and length, hence the resulting length of the extent
2291 * covering maximum file size must fit into on-disk format containers as
2292 * well. Given that length is always by 1 unit bigger than max unit (because
2293 * we count 0 as well) we have to lower the s_maxbytes by one fs block.
2294 *
cd2291a4
ES		 2295 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
2296 */
f287a1a5 2297static loff_t ext4_max_size(int blkbits, int has_huge_files)
cd2291a4
ES		 2298{
2299 loff_t res;
2300 loff_t upper_limit = MAX_LFS_FILESIZE;
2301
2302 /* small i_blocks in vfs inode? */
f287a1a5 2303 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
cd2291a4 2304 /*
90c699a9 2305 * CONFIG_LBDAF is not enabled implies the inode
cd2291a4
ES		 2306 * i_block represent total blocks in 512 bytes
2307 * 32 == size of vfs inode i_blocks * 8
2308 */
2309 upper_limit = (1LL << 32) - 1;
2310
2311 /* total blocks in file system block size */
2312 upper_limit >>= (blkbits - 9);
2313 upper_limit <<= blkbits;
2314 }
2315
f17722f9
LC		 2316 /*
2317 * 32-bit extent-start container, ee_block. We lower the maxbytes
2318 * by one fs block, so ee_len can cover the extent of maximum file
2319 * size
2320 */
2321 res = (1LL << 32) - 1;
cd2291a4 2322 res <<= blkbits;
cd2291a4
ES		 2323
2324 /* Sanity check against vm- & vfs- imposed limits */
2325 if (res > upper_limit)
2326 res = upper_limit;
2327
2328 return res;
2329}
ac27a0ec 2330
ac27a0ec 2331/*
cd2291a4 2332 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
0fc1b451
AK		 2333 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2334 * We need to be 1 filesystem block less than the 2^48 sector limit.
ac27a0ec 2335 */
f287a1a5 2336static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
ac27a0ec 2337{
617ba13b 2338 loff_t res = EXT4_NDIR_BLOCKS;
0fc1b451
AK		 2339 int meta_blocks;
2340 loff_t upper_limit;
0b8e58a1
AD		 2341 /* This is calculated to be the largest file size for a dense, block
2342 * mapped file such that the file's total number of 512-byte sectors,
2343 * including data and all indirect blocks, does not exceed (2^48 - 1).
2344 *
2345 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2346 * number of 512-byte sectors of the file.
0fc1b451
AK		 2347 */
2348
f287a1a5 2349 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
0fc1b451 2350 /*
90c699a9 2351 * !has_huge_files or CONFIG_LBDAF not enabled implies that
0b8e58a1
AD		 2352 * the inode i_block field represents total file blocks in
2353 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
0fc1b451
AK		 2354 */
2355 upper_limit = (1LL << 32) - 1;
2356
2357 /* total blocks in file system block size */
2358 upper_limit >>= (bits - 9);
2359
2360 } else {
8180a562
AK		 2361 /*
2362 * We use 48 bit ext4_inode i_blocks
2363 * With EXT4_HUGE_FILE_FL set the i_blocks
2364 * represent total number of blocks in
2365 * file system block size
2366 */
0fc1b451
AK		 2367 upper_limit = (1LL << 48) - 1;
2368
0fc1b451
AK		 2369 }
2370
2371 /* indirect blocks */
2372 meta_blocks = 1;
2373 /* double indirect blocks */
2374 meta_blocks += 1 + (1LL << (bits-2));
2375 /* tripple indirect blocks */
2376 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
2377
2378 upper_limit -= meta_blocks;
2379 upper_limit <<= bits;
ac27a0ec
DK		 2380
2381 res += 1LL << (bits-2);
2382 res += 1LL << (2*(bits-2));
2383 res += 1LL << (3*(bits-2));
2384 res <<= bits;
2385 if (res > upper_limit)
2386 res = upper_limit;
0fc1b451
AK		 2387
2388 if (res > MAX_LFS_FILESIZE)
2389 res = MAX_LFS_FILESIZE;
2390
ac27a0ec
DK		 2391 return res;
2392}
2393
617ba13b 2394static ext4_fsblk_t descriptor_loc(struct super_block *sb,
0b8e58a1 2395 ext4_fsblk_t logical_sb_block, int nr)
ac27a0ec 2396{
617ba13b 2397 struct ext4_sb_info *sbi = EXT4_SB(sb);
fd2d4291 2398 ext4_group_t bg, first_meta_bg;
ac27a0ec
DK		 2399 int has_super = 0;
2400
2401 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
2402
617ba13b 2403 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
ac27a0ec 2404 nr < first_meta_bg)
70bbb3e0 2405 return logical_sb_block + nr + 1;
ac27a0ec 2406 bg = sbi->s_desc_per_block * nr;
617ba13b 2407 if (ext4_bg_has_super(sb, bg))
ac27a0ec 2408 has_super = 1;
0b8e58a1 2409
617ba13b 2410 return (has_super + ext4_group_first_block_no(sb, bg));
ac27a0ec
DK		 2411}
2412
c9de560d
AT		 2413/**
2414 * ext4_get_stripe_size: Get the stripe size.
2415 * @sbi: In memory super block info
2416 *
2417 * If we have specified it via mount option, then
2418 * use the mount option value. If the value specified at mount time is
2419 * greater than the blocks per group use the super block value.
2420 * If the super block value is greater than blocks per group return 0.
2421 * Allocator needs it be less than blocks per group.
2422 *
2423 */
2424static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
2425{
2426 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
2427 unsigned long stripe_width =
2428 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
3eb08658 2429 int ret;
c9de560d
AT		 2430
2431 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
3eb08658
DE		 2432 ret = sbi->s_stripe;
2433 else if (stripe_width <= sbi->s_blocks_per_group)
2434 ret = stripe_width;
2435 else if (stride <= sbi->s_blocks_per_group)
2436 ret = stride;
2437 else
2438 ret = 0;
c9de560d 2439
3eb08658
DE		 2440 /*
2441 * If the stripe width is 1, this makes no sense and
2442 * we set it to 0 to turn off stripe handling code.
2443 */
2444 if (ret <= 1)
2445 ret = 0;
c9de560d 2446
3eb08658 2447 return ret;
c9de560d 2448}
ac27a0ec 2449
3197ebdb
TT		 2450/* sysfs supprt */
2451
2452struct ext4_attr {
2453 struct attribute attr;
2454 ssize_t (*show)(struct ext4_attr *, struct ext4_sb_info *, char *);
60e6679e 2455 ssize_t (*store)(struct ext4_attr *, struct ext4_sb_info *,
3197ebdb
TT		 2456 const char *, size_t);
2457 int offset;
2458};
2459
2460static int parse_strtoul(const char *buf,
2461 unsigned long max, unsigned long *value)
2462{
2463 char *endp;
2464
e7d2860b
AGR		 2465 *value = simple_strtoul(skip_spaces(buf), &endp, 0);
2466 endp = skip_spaces(endp);
3197ebdb
TT		 2467 if (*endp || *value > max)
2468 return -EINVAL;
2469
2470 return 0;
2471}
2472
2473static ssize_t delayed_allocation_blocks_show(struct ext4_attr *a,
2474 struct ext4_sb_info *sbi,
2475 char *buf)
2476{
2477 return snprintf(buf, PAGE_SIZE, "%llu\n",
7b415bf6
AK		 2478 (s64) EXT4_C2B(sbi,
2479 percpu_counter_sum(&sbi->s_dirtyclusters_counter)));
3197ebdb
TT		 2480}
2481
2482static ssize_t session_write_kbytes_show(struct ext4_attr *a,
2483 struct ext4_sb_info *sbi, char *buf)
2484{
2485 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2486
f613dfcb
TT		 2487 if (!sb->s_bdev->bd_part)
2488 return snprintf(buf, PAGE_SIZE, "0\n");
3197ebdb
TT		 2489 return snprintf(buf, PAGE_SIZE, "%lu\n",
2490 (part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
2491 sbi->s_sectors_written_start) >> 1);
2492}
2493
2494static ssize_t lifetime_write_kbytes_show(struct ext4_attr *a,
2495 struct ext4_sb_info *sbi, char *buf)
2496{
2497 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2498
f613dfcb
TT		 2499 if (!sb->s_bdev->bd_part)
2500 return snprintf(buf, PAGE_SIZE, "0\n");
3197ebdb 2501 return snprintf(buf, PAGE_SIZE, "%llu\n",
a6b43e38 2502 (unsigned long long)(sbi->s_kbytes_written +
3197ebdb 2503 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
a6b43e38 2504 EXT4_SB(sb)->s_sectors_written_start) >> 1)));
3197ebdb
TT		 2505}
2506
77f4135f
VH		 2507static ssize_t extent_cache_hits_show(struct ext4_attr *a,
2508 struct ext4_sb_info *sbi, char *buf)
2509{
2510 return snprintf(buf, PAGE_SIZE, "%lu\n", sbi->extent_cache_hits);
2511}
2512
2513static ssize_t extent_cache_misses_show(struct ext4_attr *a,
2514 struct ext4_sb_info *sbi, char *buf)
2515{
2516 return snprintf(buf, PAGE_SIZE, "%lu\n", sbi->extent_cache_misses);
2517}
2518
3197ebdb
TT		 2519static ssize_t inode_readahead_blks_store(struct ext4_attr *a,
2520 struct ext4_sb_info *sbi,
2521 const char *buf, size_t count)
2522{
2523 unsigned long t;
2524
2525 if (parse_strtoul(buf, 0x40000000, &t))
2526 return -EINVAL;
2527
5dbd571d 2528 if (t && !is_power_of_2(t))
3197ebdb
TT		 2529 return -EINVAL;
2530
2531 sbi->s_inode_readahead_blks = t;
2532 return count;
2533}
2534
2535static ssize_t sbi_ui_show(struct ext4_attr *a,
0b8e58a1 2536 struct ext4_sb_info *sbi, char *buf)
3197ebdb
TT		 2537{
2538 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
2539
2540 return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
2541}
2542
2543static ssize_t sbi_ui_store(struct ext4_attr *a,
2544 struct ext4_sb_info *sbi,
2545 const char *buf, size_t count)
2546{
2547 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
2548 unsigned long t;
2549
2550 if (parse_strtoul(buf, 0xffffffff, &t))
2551 return -EINVAL;
2552 *ui = t;
2553 return count;
2554}
2555
2556#define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \
2557static struct ext4_attr ext4_attr_##_name = { \
2558 .attr = {.name = __stringify(_name), .mode = _mode }, \
2559 .show = _show, \
2560 .store = _store, \
2561 .offset = offsetof(struct ext4_sb_info, _elname), \
2562}
2563#define EXT4_ATTR(name, mode, show, store) \
2564static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store)
2565
857ac889 2566#define EXT4_INFO_ATTR(name) EXT4_ATTR(name, 0444, NULL, NULL)
3197ebdb
TT		 2567#define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL)
2568#define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store)
2569#define EXT4_RW_ATTR_SBI_UI(name, elname) \
2570 EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname)
2571#define ATTR_LIST(name) &ext4_attr_##name.attr
2572
2573EXT4_RO_ATTR(delayed_allocation_blocks);
2574EXT4_RO_ATTR(session_write_kbytes);
2575EXT4_RO_ATTR(lifetime_write_kbytes);
77f4135f
VH		 2576EXT4_RO_ATTR(extent_cache_hits);
2577EXT4_RO_ATTR(extent_cache_misses);
3197ebdb
TT		 2578EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, sbi_ui_show,
2579 inode_readahead_blks_store, s_inode_readahead_blks);
11013911 2580EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal);
3197ebdb
TT		 2581EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats);
2582EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan);
2583EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan);
2584EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs);
2585EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request);
2586EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc);
55138e0b 2587EXT4_RW_ATTR_SBI_UI(max_writeback_mb_bump, s_max_writeback_mb_bump);
3197ebdb
TT		 2588
2589static struct attribute *ext4_attrs[] = {
2590 ATTR_LIST(delayed_allocation_blocks),
2591 ATTR_LIST(session_write_kbytes),
2592 ATTR_LIST(lifetime_write_kbytes),
77f4135f
VH		 2593 ATTR_LIST(extent_cache_hits),
2594 ATTR_LIST(extent_cache_misses),
3197ebdb 2595 ATTR_LIST(inode_readahead_blks),
11013911 2596 ATTR_LIST(inode_goal),
3197ebdb
TT		 2597 ATTR_LIST(mb_stats),
2598 ATTR_LIST(mb_max_to_scan),
2599 ATTR_LIST(mb_min_to_scan),
2600 ATTR_LIST(mb_order2_req),
2601 ATTR_LIST(mb_stream_req),
2602 ATTR_LIST(mb_group_prealloc),
55138e0b 2603 ATTR_LIST(max_writeback_mb_bump),
3197ebdb
TT		 2604 NULL,
2605};
2606
857ac889
LC		 2607/* Features this copy of ext4 supports */
2608EXT4_INFO_ATTR(lazy_itable_init);
27ee40df 2609EXT4_INFO_ATTR(batched_discard);
857ac889
LC		 2610
2611static struct attribute *ext4_feat_attrs[] = {
2612 ATTR_LIST(lazy_itable_init),
27ee40df 2613 ATTR_LIST(batched_discard),
857ac889
LC		 2614 NULL,
2615};
2616
3197ebdb
TT		 2617static ssize_t ext4_attr_show(struct kobject *kobj,
2618 struct attribute *attr, char *buf)
2619{
2620 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2621 s_kobj);
2622 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2623
2624 return a->show ? a->show(a, sbi, buf) : 0;
2625}
2626
2627static ssize_t ext4_attr_store(struct kobject *kobj,
2628 struct attribute *attr,
2629 const char *buf, size_t len)
2630{
2631 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2632 s_kobj);
2633 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2634
2635 return a->store ? a->store(a, sbi, buf, len) : 0;
2636}
2637
2638static void ext4_sb_release(struct kobject *kobj)
2639{
2640 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2641 s_kobj);
2642 complete(&sbi->s_kobj_unregister);
2643}
2644
52cf25d0 2645static const struct sysfs_ops ext4_attr_ops = {
3197ebdb
TT		 2646 .show = ext4_attr_show,
2647 .store = ext4_attr_store,
2648};
2649
2650static struct kobj_type ext4_ktype = {
2651 .default_attrs = ext4_attrs,
2652 .sysfs_ops = &ext4_attr_ops,
2653 .release = ext4_sb_release,
2654};
2655
857ac889
LC		 2656static void ext4_feat_release(struct kobject *kobj)
2657{
2658 complete(&ext4_feat->f_kobj_unregister);
2659}
2660
2661static struct kobj_type ext4_feat_ktype = {
2662 .default_attrs = ext4_feat_attrs,
2663 .sysfs_ops = &ext4_attr_ops,
2664 .release = ext4_feat_release,
2665};
2666
a13fb1a4
ES		 2667/*
2668 * Check whether this filesystem can be mounted based on
2669 * the features present and the RDONLY/RDWR mount requested.
2670 * Returns 1 if this filesystem can be mounted as requested,
2671 * 0 if it cannot be.
2672 */
2673static int ext4_feature_set_ok(struct super_block *sb, int readonly)
2674{
2675 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP)) {
2676 ext4_msg(sb, KERN_ERR,
2677 "Couldn't mount because of "
2678 "unsupported optional features (%x)",
2679 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
2680 ~EXT4_FEATURE_INCOMPAT_SUPP));
2681 return 0;
2682 }
2683
2684 if (readonly)
2685 return 1;
2686
2687 /* Check that feature set is OK for a read-write mount */
2688 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP)) {
2689 ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of "
2690 "unsupported optional features (%x)",
2691 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
2692 ~EXT4_FEATURE_RO_COMPAT_SUPP));
2693 return 0;
2694 }
2695 /*
2696 * Large file size enabled file system can only be mounted
2697 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
2698 */
2699 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) {
2700 if (sizeof(blkcnt_t) < sizeof(u64)) {
2701 ext4_msg(sb, KERN_ERR, "Filesystem with huge files "
2702 "cannot be mounted RDWR without "
2703 "CONFIG_LBDAF");
2704 return 0;
2705 }
2706 }
bab08ab9
TT		 2707 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_BIGALLOC) &&
2708 !EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS)) {
2709 ext4_msg(sb, KERN_ERR,
2710 "Can't support bigalloc feature without "
2711 "extents feature\n");
2712 return 0;
2713 }
a13fb1a4
ES		 2714 return 1;
2715}
2716
66e61a9e
TT		 2717/*
2718 * This function is called once a day if we have errors logged
2719 * on the file system
2720 */
2721static void print_daily_error_info(unsigned long arg)
2722{
2723 struct super_block *sb = (struct super_block *) arg;
2724 struct ext4_sb_info *sbi;
2725 struct ext4_super_block *es;
2726
2727 sbi = EXT4_SB(sb);
2728 es = sbi->s_es;
2729
2730 if (es->s_error_count)
2731 ext4_msg(sb, KERN_NOTICE, "error count: %u",
2732 le32_to_cpu(es->s_error_count));
2733 if (es->s_first_error_time) {
2734 printk(KERN_NOTICE "EXT4-fs (%s): initial error at %u: %.*s:%d",
2735 sb->s_id, le32_to_cpu(es->s_first_error_time),
2736 (int) sizeof(es->s_first_error_func),
2737 es->s_first_error_func,
2738 le32_to_cpu(es->s_first_error_line));
2739 if (es->s_first_error_ino)
2740 printk(": inode %u",
2741 le32_to_cpu(es->s_first_error_ino));
2742 if (es->s_first_error_block)
2743 printk(": block %llu", (unsigned long long)
2744 le64_to_cpu(es->s_first_error_block));
2745 printk("\n");
2746 }
2747 if (es->s_last_error_time) {
2748 printk(KERN_NOTICE "EXT4-fs (%s): last error at %u: %.*s:%d",
2749 sb->s_id, le32_to_cpu(es->s_last_error_time),
2750 (int) sizeof(es->s_last_error_func),
2751 es->s_last_error_func,
2752 le32_to_cpu(es->s_last_error_line));
2753 if (es->s_last_error_ino)
2754 printk(": inode %u",
2755 le32_to_cpu(es->s_last_error_ino));
2756 if (es->s_last_error_block)
2757 printk(": block %llu", (unsigned long long)
2758 le64_to_cpu(es->s_last_error_block));
2759 printk("\n");
2760 }
2761 mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ); /* Once a day */
2762}
2763
bfff6873
LC		 2764/* Find next suitable group and run ext4_init_inode_table */
2765static int ext4_run_li_request(struct ext4_li_request *elr)
2766{
2767 struct ext4_group_desc *gdp = NULL;
2768 ext4_group_t group, ngroups;
2769 struct super_block *sb;
2770 unsigned long timeout = 0;
2771 int ret = 0;
2772
2773 sb = elr->lr_super;
2774 ngroups = EXT4_SB(sb)->s_groups_count;
2775
2776 for (group = elr->lr_next_group; group < ngroups; group++) {
2777 gdp = ext4_get_group_desc(sb, group, NULL);
2778 if (!gdp) {
2779 ret = 1;
2780 break;
2781 }
2782
2783 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2784 break;
2785 }
2786
2787 if (group == ngroups)
2788 ret = 1;
2789
2790 if (!ret) {
2791 timeout = jiffies;
2792 ret = ext4_init_inode_table(sb, group,
2793 elr->lr_timeout ? 0 : 1);
2794 if (elr->lr_timeout == 0) {
51ce6511
LC		 2795 timeout = (jiffies - timeout) *
2796 elr->lr_sbi->s_li_wait_mult;
bfff6873
LC		 2797 elr->lr_timeout = timeout;
2798 }
2799 elr->lr_next_sched = jiffies + elr->lr_timeout;
2800 elr->lr_next_group = group + 1;
2801 }
2802
2803 return ret;
2804}
2805
2806/*
2807 * Remove lr_request from the list_request and free the
4ed5c033 2808 * request structure. Should be called with li_list_mtx held
bfff6873
LC		 2809 */
2810static void ext4_remove_li_request(struct ext4_li_request *elr)
2811{
2812 struct ext4_sb_info *sbi;
2813
2814 if (!elr)
2815 return;
2816
2817 sbi = elr->lr_sbi;
2818
2819 list_del(&elr->lr_request);
2820 sbi->s_li_request = NULL;
2821 kfree(elr);
2822}
2823
2824static void ext4_unregister_li_request(struct super_block *sb)
2825{
1bb933fb
LC		 2826 mutex_lock(&ext4_li_mtx);
2827 if (!ext4_li_info) {
2828 mutex_unlock(&ext4_li_mtx);
bfff6873 2829 return;
1bb933fb 2830 }
bfff6873
LC		 2831
2832 mutex_lock(&ext4_li_info->li_list_mtx);
1bb933fb 2833 ext4_remove_li_request(EXT4_SB(sb)->s_li_request);
bfff6873 2834 mutex_unlock(&ext4_li_info->li_list_mtx);
1bb933fb 2835 mutex_unlock(&ext4_li_mtx);
bfff6873
LC		 2836}
2837
8f1f7453
ES		 2838static struct task_struct *ext4_lazyinit_task;
2839
bfff6873
LC		 2840/*
2841 * This is the function where ext4lazyinit thread lives. It walks
2842 * through the request list searching for next scheduled filesystem.
2843 * When such a fs is found, run the lazy initialization request
2844 * (ext4_rn_li_request) and keep track of the time spend in this
2845 * function. Based on that time we compute next schedule time of
2846 * the request. When walking through the list is complete, compute
2847 * next waking time and put itself into sleep.
2848 */
2849static int ext4_lazyinit_thread(void *arg)
2850{
2851 struct ext4_lazy_init *eli = (struct ext4_lazy_init *)arg;
2852 struct list_head *pos, *n;
2853 struct ext4_li_request *elr;
4ed5c033 2854 unsigned long next_wakeup, cur;
bfff6873
LC		 2855
2856 BUG_ON(NULL == eli);
2857
bfff6873
LC		 2858cont_thread:
2859 while (true) {
2860 next_wakeup = MAX_JIFFY_OFFSET;
2861
2862 mutex_lock(&eli->li_list_mtx);
2863 if (list_empty(&eli->li_request_list)) {
2864 mutex_unlock(&eli->li_list_mtx);
2865 goto exit_thread;
2866 }
2867
2868 list_for_each_safe(pos, n, &eli->li_request_list) {
2869 elr = list_entry(pos, struct ext4_li_request,
2870 lr_request);
2871
b2c78cd0
TT		 2872 if (time_after_eq(jiffies, elr->lr_next_sched)) {
2873 if (ext4_run_li_request(elr) != 0) {
2874 /* error, remove the lazy_init job */
2875 ext4_remove_li_request(elr);
2876 continue;
2877 }
bfff6873
LC		 2878 }
2879
2880 if (time_before(elr->lr_next_sched, next_wakeup))
2881 next_wakeup = elr->lr_next_sched;
2882 }
2883 mutex_unlock(&eli->li_list_mtx);
2884
a0acae0e 2885 try_to_freeze();
bfff6873 2886
4ed5c033
LC		 2887 cur = jiffies;
2888 if ((time_after_eq(cur, next_wakeup)) ||
f4245bd4 2889 (MAX_JIFFY_OFFSET == next_wakeup)) {
bfff6873
LC		 2890 cond_resched();
2891 continue;
2892 }
2893
4ed5c033
LC		 2894 schedule_timeout_interruptible(next_wakeup - cur);
2895
8f1f7453
ES		 2896 if (kthread_should_stop()) {
2897 ext4_clear_request_list();
2898 goto exit_thread;
2899 }
bfff6873
LC		 2900 }
2901
2902exit_thread:
2903 /*
2904 * It looks like the request list is empty, but we need
2905 * to check it under the li_list_mtx lock, to prevent any
2906 * additions into it, and of course we should lock ext4_li_mtx
2907 * to atomically free the list and ext4_li_info, because at
2908 * this point another ext4 filesystem could be registering
2909 * new one.
2910 */
2911 mutex_lock(&ext4_li_mtx);
2912 mutex_lock(&eli->li_list_mtx);
2913 if (!list_empty(&eli->li_request_list)) {
2914 mutex_unlock(&eli->li_list_mtx);
2915 mutex_unlock(&ext4_li_mtx);
2916 goto cont_thread;
2917 }
2918 mutex_unlock(&eli->li_list_mtx);
bfff6873
LC		 2919 kfree(ext4_li_info);
2920 ext4_li_info = NULL;
2921 mutex_unlock(&ext4_li_mtx);
2922
2923 return 0;
2924}
2925
2926static void ext4_clear_request_list(void)
2927{
2928 struct list_head *pos, *n;
2929 struct ext4_li_request *elr;
2930
2931 mutex_lock(&ext4_li_info->li_list_mtx);
bfff6873
LC		 2932 list_for_each_safe(pos, n, &ext4_li_info->li_request_list) {
2933 elr = list_entry(pos, struct ext4_li_request,
2934 lr_request);
2935 ext4_remove_li_request(elr);
2936 }
2937 mutex_unlock(&ext4_li_info->li_list_mtx);
2938}
2939
2940static int ext4_run_lazyinit_thread(void)
2941{
8f1f7453
ES		 2942 ext4_lazyinit_task = kthread_run(ext4_lazyinit_thread,
2943 ext4_li_info, "ext4lazyinit");
2944 if (IS_ERR(ext4_lazyinit_task)) {
2945 int err = PTR_ERR(ext4_lazyinit_task);
bfff6873 2946 ext4_clear_request_list();
bfff6873
LC		 2947 kfree(ext4_li_info);
2948 ext4_li_info = NULL;
2949 printk(KERN_CRIT "EXT4: error %d creating inode table "
2950 "initialization thread\n",
2951 err);
2952 return err;
2953 }
2954 ext4_li_info->li_state |= EXT4_LAZYINIT_RUNNING;
bfff6873
LC		 2955 return 0;
2956}
2957
2958/*
2959 * Check whether it make sense to run itable init. thread or not.
2960 * If there is at least one uninitialized inode table, return
2961 * corresponding group number, else the loop goes through all
2962 * groups and return total number of groups.
2963 */
2964static ext4_group_t ext4_has_uninit_itable(struct super_block *sb)
2965{
2966 ext4_group_t group, ngroups = EXT4_SB(sb)->s_groups_count;
2967 struct ext4_group_desc *gdp = NULL;
2968
2969 for (group = 0; group < ngroups; group++) {
2970 gdp = ext4_get_group_desc(sb, group, NULL);
2971 if (!gdp)
2972 continue;
2973
2974 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2975 break;
2976 }
2977
2978 return group;
2979}
2980
2981static int ext4_li_info_new(void)
2982{
2983 struct ext4_lazy_init *eli = NULL;
2984
2985 eli = kzalloc(sizeof(*eli), GFP_KERNEL);
2986 if (!eli)
2987 return -ENOMEM;
2988
bfff6873
LC		 2989 INIT_LIST_HEAD(&eli->li_request_list);
2990 mutex_init(&eli->li_list_mtx);
2991
bfff6873
LC		 2992 eli->li_state |= EXT4_LAZYINIT_QUIT;
2993
2994 ext4_li_info = eli;
2995
2996 return 0;
2997}
2998
2999static struct ext4_li_request *ext4_li_request_new(struct super_block *sb,
3000 ext4_group_t start)
3001{
3002 struct ext4_sb_info *sbi = EXT4_SB(sb);
3003 struct ext4_li_request *elr;
3004 unsigned long rnd;
3005
3006 elr = kzalloc(sizeof(*elr), GFP_KERNEL);
3007 if (!elr)
3008 return NULL;
3009
3010 elr->lr_super = sb;
3011 elr->lr_sbi = sbi;
3012 elr->lr_next_group = start;
3013
3014 /*
3015 * Randomize first schedule time of the request to
3016 * spread the inode table initialization requests
3017 * better.
3018 */
3019 get_random_bytes(&rnd, sizeof(rnd));
3020 elr->lr_next_sched = jiffies + (unsigned long)rnd %
3021 (EXT4_DEF_LI_MAX_START_DELAY * HZ);
3022
3023 return elr;
3024}
3025
3026static int ext4_register_li_request(struct super_block *sb,
3027 ext4_group_t first_not_zeroed)
3028{
3029 struct ext4_sb_info *sbi = EXT4_SB(sb);
3030 struct ext4_li_request *elr;
3031 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
6c5a6cb9 3032 int ret = 0;
bfff6873 3033
51ce6511
LC		 3034 if (sbi->s_li_request != NULL) {
3035 /*
3036 * Reset timeout so it can be computed again, because
3037 * s_li_wait_mult might have changed.
3038 */
3039 sbi->s_li_request->lr_timeout = 0;
beed5ecb 3040 return 0;
51ce6511 3041 }
bfff6873
LC		 3042
3043 if (first_not_zeroed == ngroups ||
3044 (sb->s_flags & MS_RDONLY) ||
55ff3840 3045 !test_opt(sb, INIT_INODE_TABLE))
beed5ecb 3046 return 0;
bfff6873
LC		 3047
3048 elr = ext4_li_request_new(sb, first_not_zeroed);
beed5ecb
NK		 3049 if (!elr)
3050 return -ENOMEM;
bfff6873
LC		 3051
3052 mutex_lock(&ext4_li_mtx);
3053
3054 if (NULL == ext4_li_info) {
3055 ret = ext4_li_info_new();
3056 if (ret)
3057 goto out;
3058 }
3059
3060 mutex_lock(&ext4_li_info->li_list_mtx);
3061 list_add(&elr->lr_request, &ext4_li_info->li_request_list);
3062 mutex_unlock(&ext4_li_info->li_list_mtx);
3063
3064 sbi->s_li_request = elr;
46e4690b
TM		 3065 /*
3066 * set elr to NULL here since it has been inserted to
3067 * the request_list and the removal and free of it is
3068 * handled by ext4_clear_request_list from now on.
3069 */
3070 elr = NULL;
bfff6873
LC		 3071
3072 if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) {
3073 ret = ext4_run_lazyinit_thread();
3074 if (ret)
3075 goto out;
3076 }
bfff6873 3077out:
beed5ecb
NK		 3078 mutex_unlock(&ext4_li_mtx);
3079 if (ret)
bfff6873 3080 kfree(elr);
bfff6873
LC		 3081 return ret;
3082}
3083
3084/*
3085 * We do not need to lock anything since this is called on
3086 * module unload.
3087 */
3088static void ext4_destroy_lazyinit_thread(void)
3089{
3090 /*
3091 * If thread exited earlier
3092 * there's nothing to be done.
3093 */
8f1f7453 3094 if (!ext4_li_info || !ext4_lazyinit_task)
bfff6873
LC		 3095 return;
3096
8f1f7453 3097 kthread_stop(ext4_lazyinit_task);
bfff6873
LC		 3098}
3099
2b2d6d01 3100static int ext4_fill_super(struct super_block *sb, void *data, int silent)
ac27a0ec 3101{
d4c402d9 3102 char *orig_data = kstrdup(data, GFP_KERNEL);
2b2d6d01 3103 struct buffer_head *bh;
617ba13b
MC		 3104 struct ext4_super_block *es = NULL;
3105 struct ext4_sb_info *sbi;
3106 ext4_fsblk_t block;
3107 ext4_fsblk_t sb_block = get_sb_block(&data);
70bbb3e0 3108 ext4_fsblk_t logical_sb_block;
ac27a0ec 3109 unsigned long offset = 0;
ac27a0ec
DK		 3110 unsigned long journal_devnum = 0;
3111 unsigned long def_mount_opts;
3112 struct inode *root;
9f6200bb 3113 char *cp;
0390131b 3114 const char *descr;
dcc7dae3 3115 int ret = -ENOMEM;
281b5995 3116 int blocksize, clustersize;
4ec11028
TT		 3117 unsigned int db_count;
3118 unsigned int i;
281b5995 3119 int needs_recovery, has_huge_files, has_bigalloc;
bd81d8ee 3120 __u64 blocks_count;
833f4077 3121 int err;
b3881f74 3122 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
bfff6873 3123 ext4_group_t first_not_zeroed;
ac27a0ec
DK		 3124
3125 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
3126 if (!sbi)
dcc7dae3 3127 goto out_free_orig;
705895b6
PE		 3128
3129 sbi->s_blockgroup_lock =
3130 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
3131 if (!sbi->s_blockgroup_lock) {
3132 kfree(sbi);
dcc7dae3 3133 goto out_free_orig;
705895b6 3134 }
ac27a0ec
DK		 3135 sb->s_fs_info = sbi;
3136 sbi->s_mount_opt = 0;
617ba13b
MC		 3137 sbi->s_resuid = EXT4_DEF_RESUID;
3138 sbi->s_resgid = EXT4_DEF_RESGID;
240799cd 3139 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
d9c9bef1 3140 sbi->s_sb_block = sb_block;
f613dfcb
TT		 3141 if (sb->s_bdev->bd_part)
3142 sbi->s_sectors_written_start =
3143 part_stat_read(sb->s_bdev->bd_part, sectors[1]);
ac27a0ec 3144
9f6200bb
TT		 3145 /* Cleanup superblock name */
3146 for (cp = sb->s_id; (cp = strchr(cp, '/'));)
3147 *cp = '!';
3148
dcc7dae3 3149 ret = -EINVAL;
617ba13b 3150 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
ac27a0ec 3151 if (!blocksize) {
b31e1552 3152 ext4_msg(sb, KERN_ERR, "unable to set blocksize");
ac27a0ec
DK		 3153 goto out_fail;
3154 }
3155
3156 /*
617ba13b 3157 * The ext4 superblock will not be buffer aligned for other than 1kB
ac27a0ec
DK		 3158 * block sizes. We need to calculate the offset from buffer start.
3159 */
617ba13b 3160 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
70bbb3e0
AM		 3161 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3162 offset = do_div(logical_sb_block, blocksize);
ac27a0ec 3163 } else {
70bbb3e0 3164 logical_sb_block = sb_block;
ac27a0ec
DK		 3165 }
3166
70bbb3e0 3167 if (!(bh = sb_bread(sb, logical_sb_block))) {
b31e1552 3168 ext4_msg(sb, KERN_ERR, "unable to read superblock");
ac27a0ec
DK		 3169 goto out_fail;
3170 }
3171 /*
3172 * Note: s_es must be initialized as soon as possible because
617ba13b 3173 * some ext4 macro-instructions depend on its value
ac27a0ec 3174 */
617ba13b 3175 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
ac27a0ec
DK		 3176 sbi->s_es = es;
3177 sb->s_magic = le16_to_cpu(es->s_magic);
617ba13b
MC		 3178 if (sb->s_magic != EXT4_SUPER_MAGIC)
3179 goto cantfind_ext4;
afc32f7e 3180 sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
ac27a0ec
DK		 3181
3182 /* Set defaults before we parse the mount options */
3183 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
fd8c37ec 3184 set_opt(sb, INIT_INODE_TABLE);
617ba13b 3185 if (def_mount_opts & EXT4_DEFM_DEBUG)
fd8c37ec 3186 set_opt(sb, DEBUG);
437ca0fd
DM		 3187 if (def_mount_opts & EXT4_DEFM_BSDGROUPS) {
3188 ext4_msg(sb, KERN_WARNING, deprecated_msg, "bsdgroups",
3189 "2.6.38");
fd8c37ec 3190 set_opt(sb, GRPID);
437ca0fd 3191 }
617ba13b 3192 if (def_mount_opts & EXT4_DEFM_UID16)
fd8c37ec 3193 set_opt(sb, NO_UID32);
ea663336 3194 /* xattr user namespace & acls are now defaulted on */
03010a33 3195#ifdef CONFIG_EXT4_FS_XATTR
ea663336 3196 set_opt(sb, XATTR_USER);
2e7842b8 3197#endif
03010a33 3198#ifdef CONFIG_EXT4_FS_POSIX_ACL
ea663336 3199 set_opt(sb, POSIX_ACL);
2e7842b8 3200#endif
6fd7a467 3201 set_opt(sb, MBLK_IO_SUBMIT);
617ba13b 3202 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
fd8c37ec 3203 set_opt(sb, JOURNAL_DATA);
617ba13b 3204 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
fd8c37ec 3205 set_opt(sb, ORDERED_DATA);
617ba13b 3206 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
fd8c37ec 3207 set_opt(sb, WRITEBACK_DATA);
617ba13b
MC		 3208
3209 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
fd8c37ec 3210 set_opt(sb, ERRORS_PANIC);
bb4f397a 3211 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
fd8c37ec 3212 set_opt(sb, ERRORS_CONT);
bb4f397a 3213 else
fd8c37ec 3214 set_opt(sb, ERRORS_RO);
8b67f04a 3215 if (def_mount_opts & EXT4_DEFM_BLOCK_VALIDITY)
fd8c37ec 3216 set_opt(sb, BLOCK_VALIDITY);
8b67f04a 3217 if (def_mount_opts & EXT4_DEFM_DISCARD)
fd8c37ec 3218 set_opt(sb, DISCARD);
ac27a0ec
DK		 3219
3220 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
3221 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
30773840
TT		 3222 sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
3223 sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
3224 sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
ac27a0ec 3225
8b67f04a 3226 if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0)
fd8c37ec 3227 set_opt(sb, BARRIER);
ac27a0ec 3228
dd919b98
AK		 3229 /*
3230 * enable delayed allocation by default
3231 * Use -o nodelalloc to turn it off
3232 */
8b67f04a
TT		 3233 if (!IS_EXT3_SB(sb) &&
3234 ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0))
fd8c37ec 3235 set_opt(sb, DELALLOC);
dd919b98 3236
51ce6511
LC		 3237 /*
3238 * set default s_li_wait_mult for lazyinit, for the case there is
3239 * no mount option specified.
3240 */
3241 sbi->s_li_wait_mult = EXT4_DEF_LI_WAIT_MULT;
3242
8b67f04a
TT		 3243 if (!parse_options((char *) sbi->s_es->s_mount_opts, sb,
3244 &journal_devnum, &journal_ioprio, NULL, 0)) {
3245 ext4_msg(sb, KERN_WARNING,
3246 "failed to parse options in superblock: %s",
3247 sbi->s_es->s_mount_opts);
3248 }
b3881f74
TT		 3249 if (!parse_options((char *) data, sb, &journal_devnum,
3250 &journal_ioprio, NULL, 0))
ac27a0ec
DK		 3251 goto failed_mount;
3252
56889787
TT		 3253 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
3254 printk_once(KERN_WARNING "EXT4-fs: Warning: mounting "
3255 "with data=journal disables delayed "
3256 "allocation and O_DIRECT support!\n");
3257 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
3258 ext4_msg(sb, KERN_ERR, "can't mount with "
3259 "both data=journal and delalloc");
3260 goto failed_mount;
3261 }
3262 if (test_opt(sb, DIOREAD_NOLOCK)) {
3263 ext4_msg(sb, KERN_ERR, "can't mount with "
3264 "both data=journal and delalloc");
3265 goto failed_mount;
3266 }
3267 if (test_opt(sb, DELALLOC))
3268 clear_opt(sb, DELALLOC);
3269 }
3270
3271 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
3272 if (test_opt(sb, DIOREAD_NOLOCK)) {
3273 if (blocksize < PAGE_SIZE) {
3274 ext4_msg(sb, KERN_ERR, "can't mount with "
3275 "dioread_nolock if block size != PAGE_SIZE");
3276 goto failed_mount;
3277 }
3278 }
3279
ac27a0ec 3280 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
482a7425 3281 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec 3282
617ba13b
MC		 3283 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
3284 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
3285 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
3286 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
b31e1552
ES		 3287 ext4_msg(sb, KERN_WARNING,
3288 "feature flags set on rev 0 fs, "
3289 "running e2fsck is recommended");
469108ff 3290
2035e776
TT		 3291 if (IS_EXT2_SB(sb)) {
3292 if (ext2_feature_set_ok(sb))
3293 ext4_msg(sb, KERN_INFO, "mounting ext2 file system "
3294 "using the ext4 subsystem");
3295 else {
3296 ext4_msg(sb, KERN_ERR, "couldn't mount as ext2 due "
3297 "to feature incompatibilities");
3298 goto failed_mount;
3299 }
3300 }
3301
3302 if (IS_EXT3_SB(sb)) {
3303 if (ext3_feature_set_ok(sb))
3304 ext4_msg(sb, KERN_INFO, "mounting ext3 file system "
3305 "using the ext4 subsystem");
3306 else {
3307 ext4_msg(sb, KERN_ERR, "couldn't mount as ext3 due "
3308 "to feature incompatibilities");
3309 goto failed_mount;
3310 }
3311 }
3312
ac27a0ec
DK		 3313 /*
3314 * Check feature flags regardless of the revision level, since we
3315 * previously didn't change the revision level when setting the flags,
3316 * so there is a chance incompat flags are set on a rev 0 filesystem.
3317 */
a13fb1a4 3318 if (!ext4_feature_set_ok(sb, (sb->s_flags & MS_RDONLY)))
ac27a0ec 3319 goto failed_mount;
a13fb1a4 3320
617ba13b
MC		 3321 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
3322 blocksize > EXT4_MAX_BLOCK_SIZE) {
b31e1552
ES		 3323 ext4_msg(sb, KERN_ERR,
3324 "Unsupported filesystem blocksize %d", blocksize);
ac27a0ec
DK		 3325 goto failed_mount;
3326 }
3327
ac27a0ec 3328 if (sb->s_blocksize != blocksize) {
ce40733c
AK		 3329 /* Validate the filesystem blocksize */
3330 if (!sb_set_blocksize(sb, blocksize)) {
b31e1552 3331 ext4_msg(sb, KERN_ERR, "bad block size %d",
ce40733c 3332 blocksize);
ac27a0ec
DK		 3333 goto failed_mount;
3334 }
3335
2b2d6d01 3336 brelse(bh);
70bbb3e0
AM		 3337 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3338 offset = do_div(logical_sb_block, blocksize);
3339 bh = sb_bread(sb, logical_sb_block);
ac27a0ec 3340 if (!bh) {
b31e1552
ES		 3341 ext4_msg(sb, KERN_ERR,
3342 "Can't read superblock on 2nd try");
ac27a0ec
DK		 3343 goto failed_mount;
3344 }
617ba13b 3345 es = (struct ext4_super_block *)(((char *)bh->b_data) + offset);
ac27a0ec 3346 sbi->s_es = es;
617ba13b 3347 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
b31e1552
ES		 3348 ext4_msg(sb, KERN_ERR,
3349 "Magic mismatch, very weird!");
ac27a0ec
DK		 3350 goto failed_mount;
3351 }
3352 }
3353
a13fb1a4
ES		 3354 has_huge_files = EXT4_HAS_RO_COMPAT_FEATURE(sb,
3355 EXT4_FEATURE_RO_COMPAT_HUGE_FILE);
f287a1a5
TT		 3356 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
3357 has_huge_files);
3358 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
ac27a0ec 3359
617ba13b
MC		 3360 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
3361 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
3362 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
ac27a0ec
DK		 3363 } else {
3364 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
3365 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
617ba13b 3366 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
1330593e 3367 (!is_power_of_2(sbi->s_inode_size)) ||
ac27a0ec 3368 (sbi->s_inode_size > blocksize)) {
b31e1552
ES		 3369 ext4_msg(sb, KERN_ERR,
3370 "unsupported inode size: %d",
2b2d6d01 3371 sbi->s_inode_size);
ac27a0ec
DK		 3372 goto failed_mount;
3373 }
ef7f3835
KS		 3374 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
3375 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
ac27a0ec 3376 }
0b8e58a1 3377
0d1ee42f
AR		 3378 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
3379 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
8fadc143 3380 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
0d1ee42f 3381 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
d8ea6cf8 3382 !is_power_of_2(sbi->s_desc_size)) {
b31e1552
ES		 3383 ext4_msg(sb, KERN_ERR,
3384 "unsupported descriptor size %lu",
0d1ee42f
AR		 3385 sbi->s_desc_size);
3386 goto failed_mount;
3387 }
3388 } else
3389 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
0b8e58a1 3390
ac27a0ec 3391 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
ac27a0ec 3392 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
b47b6f38 3393 if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
617ba13b 3394 goto cantfind_ext4;
0b8e58a1 3395
617ba13b 3396 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
ac27a0ec 3397 if (sbi->s_inodes_per_block == 0)
617ba13b 3398 goto cantfind_ext4;
ac27a0ec
DK		 3399 sbi->s_itb_per_group = sbi->s_inodes_per_group /
3400 sbi->s_inodes_per_block;
0d1ee42f 3401 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
ac27a0ec
DK		 3402 sbi->s_sbh = bh;
3403 sbi->s_mount_state = le16_to_cpu(es->s_state);
e57aa839
FW		 3404 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
3405 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
0b8e58a1 3406
2b2d6d01 3407 for (i = 0; i < 4; i++)
ac27a0ec
DK		 3408 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
3409 sbi->s_def_hash_version = es->s_def_hash_version;
f99b2589
TT		 3410 i = le32_to_cpu(es->s_flags);
3411 if (i & EXT2_FLAGS_UNSIGNED_HASH)
3412 sbi->s_hash_unsigned = 3;
3413 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
3414#ifdef __CHAR_UNSIGNED__
3415 es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
3416 sbi->s_hash_unsigned = 3;
3417#else
3418 es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
3419#endif
3420 sb->s_dirt = 1;
3421 }
ac27a0ec 3422
281b5995
TT		 3423 /* Handle clustersize */
3424 clustersize = BLOCK_SIZE << le32_to_cpu(es->s_log_cluster_size);
3425 has_bigalloc = EXT4_HAS_RO_COMPAT_FEATURE(sb,
3426 EXT4_FEATURE_RO_COMPAT_BIGALLOC);
3427 if (has_bigalloc) {
3428 if (clustersize < blocksize) {
3429 ext4_msg(sb, KERN_ERR,
3430 "cluster size (%d) smaller than "
3431 "block size (%d)", clustersize, blocksize);
3432 goto failed_mount;
3433 }
3434 sbi->s_cluster_bits = le32_to_cpu(es->s_log_cluster_size) -
3435 le32_to_cpu(es->s_log_block_size);
3436 sbi->s_clusters_per_group =
3437 le32_to_cpu(es->s_clusters_per_group);
3438 if (sbi->s_clusters_per_group > blocksize * 8) {
3439 ext4_msg(sb, KERN_ERR,
3440 "#clusters per group too big: %lu",
3441 sbi->s_clusters_per_group);
3442 goto failed_mount;
3443 }
3444 if (sbi->s_blocks_per_group !=
3445 (sbi->s_clusters_per_group * (clustersize / blocksize))) {
3446 ext4_msg(sb, KERN_ERR, "blocks per group (%lu) and "
3447 "clusters per group (%lu) inconsistent",
3448 sbi->s_blocks_per_group,
3449 sbi->s_clusters_per_group);
3450 goto failed_mount;
3451 }
3452 } else {
3453 if (clustersize != blocksize) {
3454 ext4_warning(sb, "fragment/cluster size (%d) != "
3455 "block size (%d)", clustersize,
3456 blocksize);
3457 clustersize = blocksize;
3458 }
3459 if (sbi->s_blocks_per_group > blocksize * 8) {
3460 ext4_msg(sb, KERN_ERR,
3461 "#blocks per group too big: %lu",
3462 sbi->s_blocks_per_group);
3463 goto failed_mount;
3464 }
3465 sbi->s_clusters_per_group = sbi->s_blocks_per_group;
3466 sbi->s_cluster_bits = 0;
ac27a0ec 3467 }
281b5995
TT		 3468 sbi->s_cluster_ratio = clustersize / blocksize;
3469
ac27a0ec 3470 if (sbi->s_inodes_per_group > blocksize * 8) {
b31e1552
ES		 3471 ext4_msg(sb, KERN_ERR,
3472 "#inodes per group too big: %lu",
2b2d6d01 3473 sbi->s_inodes_per_group);
ac27a0ec
DK		 3474 goto failed_mount;
3475 }
3476
bf43d84b
ES		 3477 /*
3478 * Test whether we have more sectors than will fit in sector_t,
3479 * and whether the max offset is addressable by the page cache.
3480 */
5a9ae68a 3481 err = generic_check_addressable(sb->s_blocksize_bits,
30ca22c7 3482 ext4_blocks_count(es));
5a9ae68a 3483 if (err) {
b31e1552 3484 ext4_msg(sb, KERN_ERR, "filesystem"
bf43d84b 3485 " too large to mount safely on this system");
ac27a0ec 3486 if (sizeof(sector_t) < 8)
90c699a9 3487 ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled");
5a9ae68a 3488 ret = err;
ac27a0ec
DK		 3489 goto failed_mount;
3490 }
3491
617ba13b
MC		 3492 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
3493 goto cantfind_ext4;
e7c95593 3494
0f2ddca6
FTN		 3495 /* check blocks count against device size */
3496 blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
3497 if (blocks_count && ext4_blocks_count(es) > blocks_count) {
b31e1552
ES		 3498 ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
3499 "exceeds size of device (%llu blocks)",
0f2ddca6
FTN		 3500 ext4_blocks_count(es), blocks_count);
3501 goto failed_mount;
3502 }
3503
0b8e58a1
AD		 3504 /*
3505 * It makes no sense for the first data block to be beyond the end
3506 * of the filesystem.
3507 */
3508 if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
5635a62b 3509 ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
b31e1552
ES		 3510 "block %u is beyond end of filesystem (%llu)",
3511 le32_to_cpu(es->s_first_data_block),
3512 ext4_blocks_count(es));
e7c95593
ES		 3513 goto failed_mount;
3514 }
bd81d8ee
LV		 3515 blocks_count = (ext4_blocks_count(es) -
3516 le32_to_cpu(es->s_first_data_block) +
3517 EXT4_BLOCKS_PER_GROUP(sb) - 1);
3518 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
4ec11028 3519 if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
b31e1552 3520 ext4_msg(sb, KERN_WARNING, "groups count too large: %u "
4ec11028 3521 "(block count %llu, first data block %u, "
b31e1552 3522 "blocks per group %lu)", sbi->s_groups_count,
4ec11028
TT		 3523 ext4_blocks_count(es),
3524 le32_to_cpu(es->s_first_data_block),
3525 EXT4_BLOCKS_PER_GROUP(sb));
3526 goto failed_mount;
3527 }
bd81d8ee 3528 sbi->s_groups_count = blocks_count;
fb0a387d
ES		 3529 sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
3530 (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
617ba13b
MC		 3531 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
3532 EXT4_DESC_PER_BLOCK(sb);
f18a5f21
TT		 3533 sbi->s_group_desc = ext4_kvmalloc(db_count *
3534 sizeof(struct buffer_head *),
3535 GFP_KERNEL);
ac27a0ec 3536 if (sbi->s_group_desc == NULL) {
b31e1552 3537 ext4_msg(sb, KERN_ERR, "not enough memory");
ac27a0ec
DK		 3538 goto failed_mount;
3539 }
3540
9f6200bb
TT		 3541 if (ext4_proc_root)
3542 sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);
240799cd 3543
705895b6 3544 bgl_lock_init(sbi->s_blockgroup_lock);
ac27a0ec
DK		 3545
3546 for (i = 0; i < db_count; i++) {
70bbb3e0 3547 block = descriptor_loc(sb, logical_sb_block, i);
ac27a0ec
DK		 3548 sbi->s_group_desc[i] = sb_bread(sb, block);
3549 if (!sbi->s_group_desc[i]) {
b31e1552
ES		 3550 ext4_msg(sb, KERN_ERR,
3551 "can't read group descriptor %d", i);
ac27a0ec
DK		 3552 db_count = i;
3553 goto failed_mount2;
3554 }
3555 }
bfff6873 3556 if (!ext4_check_descriptors(sb, &first_not_zeroed)) {
b31e1552 3557 ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
ac27a0ec
DK		 3558 goto failed_mount2;
3559 }
772cb7c8
JS		 3560 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
3561 if (!ext4_fill_flex_info(sb)) {
b31e1552
ES		 3562 ext4_msg(sb, KERN_ERR,
3563 "unable to initialize "
3564 "flex_bg meta info!");
772cb7c8
JS		 3565 goto failed_mount2;
3566 }
3567
ac27a0ec
DK		 3568 sbi->s_gdb_count = db_count;
3569 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
3570 spin_lock_init(&sbi->s_next_gen_lock);
3571
04496411
TM		 3572 init_timer(&sbi->s_err_report);
3573 sbi->s_err_report.function = print_daily_error_info;
3574 sbi->s_err_report.data = (unsigned long) sb;
3575
57042651 3576 err = percpu_counter_init(&sbi->s_freeclusters_counter,
5dee5437 3577 ext4_count_free_clusters(sb));
ce7e010a
TT		 3578 if (!err) {
3579 err = percpu_counter_init(&sbi->s_freeinodes_counter,
3580 ext4_count_free_inodes(sb));
3581 }
3582 if (!err) {
3583 err = percpu_counter_init(&sbi->s_dirs_counter,
3584 ext4_count_dirs(sb));
3585 }
3586 if (!err) {
57042651 3587 err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0);
ce7e010a
TT		 3588 }
3589 if (err) {
3590 ext4_msg(sb, KERN_ERR, "insufficient memory");
3591 goto failed_mount3;
3592 }
3593
c9de560d 3594 sbi->s_stripe = ext4_get_stripe_size(sbi);
55138e0b 3595 sbi->s_max_writeback_mb_bump = 128;
c9de560d 3596
ac27a0ec
DK		 3597 /*
3598 * set up enough so that it can read an inode
3599 */
9ca92389
TT		 3600 if (!test_opt(sb, NOLOAD) &&
3601 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
3602 sb->s_op = &ext4_sops;
3603 else
3604 sb->s_op = &ext4_nojournal_sops;
617ba13b
MC		 3605 sb->s_export_op = &ext4_export_ops;
3606 sb->s_xattr = ext4_xattr_handlers;
ac27a0ec 3607#ifdef CONFIG_QUOTA
617ba13b
MC		 3608 sb->s_qcop = &ext4_qctl_operations;
3609 sb->dq_op = &ext4_quota_operations;
ac27a0ec 3610#endif
f2fa2ffc
AK		 3611 memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
3612
ac27a0ec 3613 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
3b9d4ed2 3614 mutex_init(&sbi->s_orphan_lock);
8f82f840 3615 sbi->s_resize_flags = 0;
ac27a0ec
DK		 3616
3617 sb->s_root = NULL;
3618
3619 needs_recovery = (es->s_last_orphan != 0 ||
617ba13b
MC		 3620 EXT4_HAS_INCOMPAT_FEATURE(sb,
3621 EXT4_FEATURE_INCOMPAT_RECOVER));
ac27a0ec 3622
c5e06d10
JL		 3623 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_MMP) &&
3624 !(sb->s_flags & MS_RDONLY))
3625 if (ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block)))
3626 goto failed_mount3;
3627
ac27a0ec
DK		 3628 /*
3629 * The first inode we look at is the journal inode. Don't try
3630 * root first: it may be modified in the journal!
3631 */
3632 if (!test_opt(sb, NOLOAD) &&
617ba13b
MC		 3633 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
3634 if (ext4_load_journal(sb, es, journal_devnum))
ac27a0ec 3635 goto failed_mount3;
0390131b
FM		 3636 } else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) &&
3637 EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
b31e1552
ES		 3638 ext4_msg(sb, KERN_ERR, "required journal recovery "
3639 "suppressed and not mounted read-only");
744692dc 3640 goto failed_mount_wq;
ac27a0ec 3641 } else {
fd8c37ec 3642 clear_opt(sb, DATA_FLAGS);
0390131b
FM		 3643 sbi->s_journal = NULL;
3644 needs_recovery = 0;
3645 goto no_journal;
ac27a0ec
DK		 3646 }
3647
eb40a09c
JS		 3648 if (ext4_blocks_count(es) > 0xffffffffULL &&
3649 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
3650 JBD2_FEATURE_INCOMPAT_64BIT)) {
b31e1552 3651 ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
744692dc 3652 goto failed_mount_wq;
eb40a09c
JS		 3653 }
3654
d4da6c9c
LT		 3655 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
3656 jbd2_journal_set_features(sbi->s_journal,
3657 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
818d276c 3658 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
d4da6c9c
LT		 3659 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
3660 jbd2_journal_set_features(sbi->s_journal,
3661 JBD2_FEATURE_COMPAT_CHECKSUM, 0, 0);
818d276c
GS		 3662 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
3663 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
d4da6c9c
LT		 3664 } else {
3665 jbd2_journal_clear_features(sbi->s_journal,
3666 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
3667 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
3668 }
818d276c 3669
ac27a0ec
DK		 3670 /* We have now updated the journal if required, so we can
3671 * validate the data journaling mode. */
3672 switch (test_opt(sb, DATA_FLAGS)) {
3673 case 0:
3674 /* No mode set, assume a default based on the journal
63f57933
AM		 3675 * capabilities: ORDERED_DATA if the journal can
3676 * cope, else JOURNAL_DATA
3677 */
dab291af
MC		 3678 if (jbd2_journal_check_available_features
3679 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
fd8c37ec 3680 set_opt(sb, ORDERED_DATA);
ac27a0ec 3681 else
fd8c37ec 3682 set_opt(sb, JOURNAL_DATA);
ac27a0ec
DK		 3683 break;
3684
617ba13b
MC		 3685 case EXT4_MOUNT_ORDERED_DATA:
3686 case EXT4_MOUNT_WRITEBACK_DATA:
dab291af
MC		 3687 if (!jbd2_journal_check_available_features
3688 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
b31e1552
ES		 3689 ext4_msg(sb, KERN_ERR, "Journal does not support "
3690 "requested data journaling mode");
744692dc 3691 goto failed_mount_wq;
ac27a0ec
DK		 3692 }
3693 default:
3694 break;
3695 }
b3881f74 3696 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
ac27a0ec 3697
18aadd47
BJ		 3698 sbi->s_journal->j_commit_callback = ext4_journal_commit_callback;
3699
ce7e010a
TT		 3700 /*
3701 * The journal may have updated the bg summary counts, so we
3702 * need to update the global counters.
3703 */
57042651 3704 percpu_counter_set(&sbi->s_freeclusters_counter,
5dee5437 3705 ext4_count_free_clusters(sb));
ce7e010a
TT		 3706 percpu_counter_set(&sbi->s_freeinodes_counter,
3707 ext4_count_free_inodes(sb));
3708 percpu_counter_set(&sbi->s_dirs_counter,
3709 ext4_count_dirs(sb));
57042651 3710 percpu_counter_set(&sbi->s_dirtyclusters_counter, 0);
206f7ab4 3711
ce7e010a 3712no_journal:
fd89d5f2
TH		 3713 /*
3714 * The maximum number of concurrent works can be high and
3715 * concurrency isn't really necessary. Limit it to 1.
3716 */
3717 EXT4_SB(sb)->dio_unwritten_wq =
ae005cbe 3718 alloc_workqueue("ext4-dio-unwritten", WQ_MEM_RECLAIM | WQ_UNBOUND, 1);
4c0425ff
MC		 3719 if (!EXT4_SB(sb)->dio_unwritten_wq) {
3720 printk(KERN_ERR "EXT4-fs: failed to create DIO workqueue\n");
3721 goto failed_mount_wq;
3722 }
3723
ac27a0ec 3724 /*
dab291af 3725 * The jbd2_journal_load will have done any necessary log recovery,
ac27a0ec
DK		 3726 * so we can safely mount the rest of the filesystem now.
3727 */
3728
1d1fe1ee
DH		 3729 root = ext4_iget(sb, EXT4_ROOT_INO);
3730 if (IS_ERR(root)) {
b31e1552 3731 ext4_msg(sb, KERN_ERR, "get root inode failed");
1d1fe1ee 3732 ret = PTR_ERR(root);
32a9bb57 3733 root = NULL;
ac27a0ec
DK		 3734 goto failed_mount4;
3735 }
3736 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
b31e1552 3737 ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
94bf608a 3738 iput(root);
ac27a0ec
DK		 3739 goto failed_mount4;
3740 }
1d1fe1ee
DH		 3741 sb->s_root = d_alloc_root(root);
3742 if (!sb->s_root) {
94bf608a 3743 iput(root);
b31e1552 3744 ext4_msg(sb, KERN_ERR, "get root dentry failed");
1d1fe1ee
DH		 3745 ret = -ENOMEM;
3746 goto failed_mount4;
3747 }
ac27a0ec 3748
2b2d6d01 3749 ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY);
ef7f3835
KS		 3750
3751 /* determine the minimum size of new large inodes, if present */
3752 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
3753 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
3754 EXT4_GOOD_OLD_INODE_SIZE;
3755 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3756 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) {
3757 if (sbi->s_want_extra_isize <
3758 le16_to_cpu(es->s_want_extra_isize))
3759 sbi->s_want_extra_isize =
3760 le16_to_cpu(es->s_want_extra_isize);
3761 if (sbi->s_want_extra_isize <
3762 le16_to_cpu(es->s_min_extra_isize))
3763 sbi->s_want_extra_isize =
3764 le16_to_cpu(es->s_min_extra_isize);
3765 }
3766 }
3767 /* Check if enough inode space is available */
3768 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
3769 sbi->s_inode_size) {
3770 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
3771 EXT4_GOOD_OLD_INODE_SIZE;
b31e1552
ES		 3772 ext4_msg(sb, KERN_INFO, "required extra inode space not"
3773 "available");
ef7f3835
KS		 3774 }
3775
6fd058f7
TT		 3776 err = ext4_setup_system_zone(sb);
3777 if (err) {
b31e1552 3778 ext4_msg(sb, KERN_ERR, "failed to initialize system "
fbe845dd 3779 "zone (%d)", err);
94bf608a 3780 goto failed_mount4a;
6fd058f7
TT		 3781 }
3782
c2774d84
AK		 3783 ext4_ext_init(sb);
3784 err = ext4_mb_init(sb, needs_recovery);
3785 if (err) {
421f91d2 3786 ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)",
b31e1552 3787 err);
dcf2d804 3788 goto failed_mount5;
c2774d84
AK		 3789 }
3790
bfff6873
LC		 3791 err = ext4_register_li_request(sb, first_not_zeroed);
3792 if (err)
dcf2d804 3793 goto failed_mount6;
bfff6873 3794
3197ebdb
TT		 3795 sbi->s_kobj.kset = ext4_kset;
3796 init_completion(&sbi->s_kobj_unregister);
3797 err = kobject_init_and_add(&sbi->s_kobj, &ext4_ktype, NULL,
3798 "%s", sb->s_id);
dcf2d804
TM		 3799 if (err)
3800 goto failed_mount7;
3197ebdb 3801
617ba13b
MC		 3802 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
3803 ext4_orphan_cleanup(sb, es);
3804 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
0390131b 3805 if (needs_recovery) {
b31e1552 3806 ext4_msg(sb, KERN_INFO, "recovery complete");
0390131b
FM		 3807 ext4_mark_recovery_complete(sb, es);
3808 }
3809 if (EXT4_SB(sb)->s_journal) {
3810 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
3811 descr = " journalled data mode";
3812 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
3813 descr = " ordered data mode";
3814 else
3815 descr = " writeback data mode";
3816 } else
3817 descr = "out journal";
3818
d4c402d9 3819 ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. "
8b67f04a
TT		 3820 "Opts: %s%s%s", descr, sbi->s_es->s_mount_opts,
3821 *sbi->s_es->s_mount_opts ? "; " : "", orig_data);
ac27a0ec 3822
66e61a9e
TT		 3823 if (es->s_error_count)
3824 mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */
ac27a0ec 3825
d4c402d9 3826 kfree(orig_data);
ac27a0ec
DK		 3827 return 0;
3828
617ba13b 3829cantfind_ext4:
ac27a0ec 3830 if (!silent)
b31e1552 3831 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
ac27a0ec
DK		 3832 goto failed_mount;
3833
dcf2d804
TM		 3834failed_mount7:
3835 ext4_unregister_li_request(sb);
3836failed_mount6:
dcf2d804 3837 ext4_mb_release(sb);
94bf608a
AV		 3838failed_mount5:
3839 ext4_ext_release(sb);
dcf2d804 3840 ext4_release_system_zone(sb);
94bf608a
AV		 3841failed_mount4a:
3842 dput(sb->s_root);
32a9bb57 3843 sb->s_root = NULL;
94bf608a 3844failed_mount4:
b31e1552 3845 ext4_msg(sb, KERN_ERR, "mount failed");
4c0425ff
MC		 3846 destroy_workqueue(EXT4_SB(sb)->dio_unwritten_wq);
3847failed_mount_wq:
0390131b
FM		 3848 if (sbi->s_journal) {
3849 jbd2_journal_destroy(sbi->s_journal);
3850 sbi->s_journal = NULL;
3851 }
ac27a0ec 3852failed_mount3:
04496411 3853 del_timer(&sbi->s_err_report);
9933fc0a
TT		 3854 if (sbi->s_flex_groups)
3855 ext4_kvfree(sbi->s_flex_groups);
57042651 3856 percpu_counter_destroy(&sbi->s_freeclusters_counter);
ce7e010a
TT		 3857 percpu_counter_destroy(&sbi->s_freeinodes_counter);
3858 percpu_counter_destroy(&sbi->s_dirs_counter);
57042651 3859 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
c5e06d10
JL		 3860 if (sbi->s_mmp_tsk)
3861 kthread_stop(sbi->s_mmp_tsk);
ac27a0ec
DK		 3862failed_mount2:
3863 for (i = 0; i < db_count; i++)
3864 brelse(sbi->s_group_desc[i]);
f18a5f21 3865 ext4_kvfree(sbi->s_group_desc);
ac27a0ec 3866failed_mount:
240799cd 3867 if (sbi->s_proc) {
9f6200bb 3868 remove_proc_entry(sb->s_id, ext4_proc_root);
240799cd 3869 }
ac27a0ec
DK		 3870#ifdef CONFIG_QUOTA
3871 for (i = 0; i < MAXQUOTAS; i++)
3872 kfree(sbi->s_qf_names[i]);
3873#endif
617ba13b 3874 ext4_blkdev_remove(sbi);
ac27a0ec
DK		 3875 brelse(bh);
3876out_fail:
3877 sb->s_fs_info = NULL;
f6830165 3878 kfree(sbi->s_blockgroup_lock);
ac27a0ec 3879 kfree(sbi);
dcc7dae3 3880out_free_orig:
d4c402d9 3881 kfree(orig_data);
1d1fe1ee 3882 return ret;
ac27a0ec
DK		 3883}
3884
3885/*
3886 * Setup any per-fs journal parameters now. We'll do this both on
3887 * initial mount, once the journal has been initialised but before we've
3888 * done any recovery; and again on any subsequent remount.
3889 */
617ba13b 3890static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
ac27a0ec 3891{
617ba13b 3892 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 3893
30773840
TT		 3894 journal->j_commit_interval = sbi->s_commit_interval;
3895 journal->j_min_batch_time = sbi->s_min_batch_time;
3896 journal->j_max_batch_time = sbi->s_max_batch_time;
ac27a0ec 3897
a931da6a 3898 write_lock(&journal->j_state_lock);
ac27a0ec 3899 if (test_opt(sb, BARRIER))
dab291af 3900 journal->j_flags |= JBD2_BARRIER;
ac27a0ec 3901 else
dab291af 3902 journal->j_flags &= ~JBD2_BARRIER;
5bf5683a
HK		 3903 if (test_opt(sb, DATA_ERR_ABORT))
3904 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
3905 else
3906 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
a931da6a 3907 write_unlock(&journal->j_state_lock);
ac27a0ec
DK		 3908}
3909
617ba13b 3910static journal_t *ext4_get_journal(struct super_block *sb,
ac27a0ec
DK		 3911 unsigned int journal_inum)
3912{
3913 struct inode *journal_inode;
3914 journal_t *journal;
3915
0390131b
FM		 3916 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3917
ac27a0ec
DK		 3918 /* First, test for the existence of a valid inode on disk. Bad
3919 * things happen if we iget() an unused inode, as the subsequent
3920 * iput() will try to delete it. */
3921
1d1fe1ee
DH		 3922 journal_inode = ext4_iget(sb, journal_inum);
3923 if (IS_ERR(journal_inode)) {
b31e1552 3924 ext4_msg(sb, KERN_ERR, "no journal found");
ac27a0ec
DK		 3925 return NULL;
3926 }
3927 if (!journal_inode->i_nlink) {
3928 make_bad_inode(journal_inode);
3929 iput(journal_inode);
b31e1552 3930 ext4_msg(sb, KERN_ERR, "journal inode is deleted");
ac27a0ec
DK		 3931 return NULL;
3932 }
3933
e5f8eab8 3934 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
ac27a0ec 3935 journal_inode, journal_inode->i_size);
1d1fe1ee 3936 if (!S_ISREG(journal_inode->i_mode)) {
b31e1552 3937 ext4_msg(sb, KERN_ERR, "invalid journal inode");
ac27a0ec
DK		 3938 iput(journal_inode);
3939 return NULL;
3940 }
3941
dab291af 3942 journal = jbd2_journal_init_inode(journal_inode);
ac27a0ec 3943 if (!journal) {
b31e1552 3944 ext4_msg(sb, KERN_ERR, "Could not load journal inode");
ac27a0ec
DK		 3945 iput(journal_inode);
3946 return NULL;
3947 }
3948 journal->j_private = sb;
617ba13b 3949 ext4_init_journal_params(sb, journal);
ac27a0ec
DK		 3950 return journal;
3951}
3952
617ba13b 3953static journal_t *ext4_get_dev_journal(struct super_block *sb,
ac27a0ec
DK		 3954 dev_t j_dev)
3955{
2b2d6d01 3956 struct buffer_head *bh;
ac27a0ec 3957 journal_t *journal;
617ba13b
MC		 3958 ext4_fsblk_t start;
3959 ext4_fsblk_t len;
ac27a0ec 3960 int hblock, blocksize;
617ba13b 3961 ext4_fsblk_t sb_block;
ac27a0ec 3962 unsigned long offset;
2b2d6d01 3963 struct ext4_super_block *es;
ac27a0ec
DK		 3964 struct block_device *bdev;
3965
0390131b
FM		 3966 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3967
b31e1552 3968 bdev = ext4_blkdev_get(j_dev, sb);
ac27a0ec
DK		 3969 if (bdev == NULL)
3970 return NULL;
3971
ac27a0ec 3972 blocksize = sb->s_blocksize;
e1defc4f 3973 hblock = bdev_logical_block_size(bdev);
ac27a0ec 3974 if (blocksize < hblock) {
b31e1552
ES		 3975 ext4_msg(sb, KERN_ERR,
3976 "blocksize too small for journal device");
ac27a0ec
DK		 3977 goto out_bdev;
3978 }
3979
617ba13b
MC		 3980 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
3981 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
ac27a0ec
DK		 3982 set_blocksize(bdev, blocksize);
3983 if (!(bh = __bread(bdev, sb_block, blocksize))) {
b31e1552
ES		 3984 ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
3985 "external journal");
ac27a0ec
DK		 3986 goto out_bdev;
3987 }
3988
617ba13b
MC		 3989 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
3990 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
ac27a0ec 3991 !(le32_to_cpu(es->s_feature_incompat) &
617ba13b 3992 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
b31e1552
ES		 3993 ext4_msg(sb, KERN_ERR, "external journal has "
3994 "bad superblock");
ac27a0ec
DK		 3995 brelse(bh);
3996 goto out_bdev;
3997 }
3998
617ba13b 3999 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
b31e1552 4000 ext4_msg(sb, KERN_ERR, "journal UUID does not match");
ac27a0ec
DK		 4001 brelse(bh);
4002 goto out_bdev;
4003 }
4004
bd81d8ee 4005 len = ext4_blocks_count(es);
ac27a0ec
DK		 4006 start = sb_block + 1;
4007 brelse(bh); /* we're done with the superblock */
4008
dab291af 4009 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
ac27a0ec
DK		 4010 start, len, blocksize);
4011 if (!journal) {
b31e1552 4012 ext4_msg(sb, KERN_ERR, "failed to create device journal");
ac27a0ec
DK		 4013 goto out_bdev;
4014 }
4015 journal->j_private = sb;
4016 ll_rw_block(READ, 1, &journal->j_sb_buffer);
4017 wait_on_buffer(journal->j_sb_buffer);
4018 if (!buffer_uptodate(journal->j_sb_buffer)) {
b31e1552 4019 ext4_msg(sb, KERN_ERR, "I/O error on journal device");
ac27a0ec
DK		 4020 goto out_journal;
4021 }
4022 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
b31e1552
ES		 4023 ext4_msg(sb, KERN_ERR, "External journal has more than one "
4024 "user (unsupported) - %d",
ac27a0ec
DK		 4025 be32_to_cpu(journal->j_superblock->s_nr_users));
4026 goto out_journal;
4027 }
617ba13b
MC		 4028 EXT4_SB(sb)->journal_bdev = bdev;
4029 ext4_init_journal_params(sb, journal);
ac27a0ec 4030 return journal;
0b8e58a1 4031
ac27a0ec 4032out_journal:
dab291af 4033 jbd2_journal_destroy(journal);
ac27a0ec 4034out_bdev:
617ba13b 4035 ext4_blkdev_put(bdev);
ac27a0ec
DK		 4036 return NULL;
4037}
4038
617ba13b
MC		 4039static int ext4_load_journal(struct super_block *sb,
4040 struct ext4_super_block *es,
ac27a0ec
DK		 4041 unsigned long journal_devnum)
4042{
4043 journal_t *journal;
4044 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
4045 dev_t journal_dev;
4046 int err = 0;
4047 int really_read_only;
4048
0390131b
FM		 4049 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4050
ac27a0ec
DK		 4051 if (journal_devnum &&
4052 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
b31e1552
ES		 4053 ext4_msg(sb, KERN_INFO, "external journal device major/minor "
4054 "numbers have changed");
ac27a0ec
DK		 4055 journal_dev = new_decode_dev(journal_devnum);
4056 } else
4057 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
4058
4059 really_read_only = bdev_read_only(sb->s_bdev);
4060
4061 /*
4062 * Are we loading a blank journal or performing recovery after a
4063 * crash? For recovery, we need to check in advance whether we
4064 * can get read-write access to the device.
4065 */
617ba13b 4066 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
ac27a0ec 4067 if (sb->s_flags & MS_RDONLY) {
b31e1552
ES		 4068 ext4_msg(sb, KERN_INFO, "INFO: recovery "
4069 "required on readonly filesystem");
ac27a0ec 4070 if (really_read_only) {
b31e1552
ES		 4071 ext4_msg(sb, KERN_ERR, "write access "
4072 "unavailable, cannot proceed");
ac27a0ec
DK		 4073 return -EROFS;
4074 }
b31e1552
ES		 4075 ext4_msg(sb, KERN_INFO, "write access will "
4076 "be enabled during recovery");
ac27a0ec
DK		 4077 }
4078 }
4079
4080 if (journal_inum && journal_dev) {
b31e1552
ES		 4081 ext4_msg(sb, KERN_ERR, "filesystem has both journal "
4082 "and inode journals!");
ac27a0ec
DK		 4083 return -EINVAL;
4084 }
4085
4086 if (journal_inum) {
617ba13b 4087 if (!(journal = ext4_get_journal(sb, journal_inum)))
ac27a0ec
DK		 4088 return -EINVAL;
4089 } else {
617ba13b 4090 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
ac27a0ec
DK		 4091 return -EINVAL;
4092 }
4093
90576c0b 4094 if (!(journal->j_flags & JBD2_BARRIER))
b31e1552 4095 ext4_msg(sb, KERN_INFO, "barriers disabled");
4776004f 4096
617ba13b 4097 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
dab291af 4098 err = jbd2_journal_wipe(journal, !really_read_only);
1c13d5c0
TT		 4099 if (!err) {
4100 char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL);
4101 if (save)
4102 memcpy(save, ((char *) es) +
4103 EXT4_S_ERR_START, EXT4_S_ERR_LEN);
dab291af 4104 err = jbd2_journal_load(journal);
1c13d5c0
TT		 4105 if (save)
4106 memcpy(((char *) es) + EXT4_S_ERR_START,
4107 save, EXT4_S_ERR_LEN);
4108 kfree(save);
4109 }
ac27a0ec
DK		 4110
4111 if (err) {
b31e1552 4112 ext4_msg(sb, KERN_ERR, "error loading journal");
dab291af 4113 jbd2_journal_destroy(journal);
ac27a0ec
DK		 4114 return err;
4115 }
4116
617ba13b
MC		 4117 EXT4_SB(sb)->s_journal = journal;
4118 ext4_clear_journal_err(sb, es);
ac27a0ec 4119
c41303ce 4120 if (!really_read_only && journal_devnum &&
ac27a0ec
DK		 4121 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
4122 es->s_journal_dev = cpu_to_le32(journal_devnum);
ac27a0ec
DK		 4123
4124 /* Make sure we flush the recovery flag to disk. */
e2d67052 4125 ext4_commit_super(sb, 1);
ac27a0ec
DK		 4126 }
4127
4128 return 0;
4129}
4130
e2d67052 4131static int ext4_commit_super(struct super_block *sb, int sync)
ac27a0ec 4132{
e2d67052 4133 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
617ba13b 4134 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
c4be0c1d 4135 int error = 0;
ac27a0ec 4136
7c2e7087 4137 if (!sbh || block_device_ejected(sb))
c4be0c1d 4138 return error;
914258bf
TT		 4139 if (buffer_write_io_error(sbh)) {
4140 /*
4141 * Oh, dear. A previous attempt to write the
4142 * superblock failed. This could happen because the
4143 * USB device was yanked out. Or it could happen to
4144 * be a transient write error and maybe the block will
4145 * be remapped. Nothing we can do but to retry the
4146 * write and hope for the best.
4147 */
b31e1552
ES		 4148 ext4_msg(sb, KERN_ERR, "previous I/O error to "
4149 "superblock detected");
914258bf
TT		 4150 clear_buffer_write_io_error(sbh);
4151 set_buffer_uptodate(sbh);
4152 }
71290b36
TT		 4153 /*
4154 * If the file system is mounted read-only, don't update the
4155 * superblock write time. This avoids updating the superblock
4156 * write time when we are mounting the root file system
4157 * read/only but we need to replay the journal; at that point,
4158 * for people who are east of GMT and who make their clock
4159 * tick in localtime for Windows bug-for-bug compatibility,
4160 * the clock is set in the future, and this will cause e2fsck
4161 * to complain and force a full file system check.
4162 */
4163 if (!(sb->s_flags & MS_RDONLY))
4164 es->s_wtime = cpu_to_le32(get_seconds());
f613dfcb
TT		 4165 if (sb->s_bdev->bd_part)
4166 es->s_kbytes_written =
4167 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written +
afc32f7e
TT		 4168 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
4169 EXT4_SB(sb)->s_sectors_written_start) >> 1));
f613dfcb
TT		 4170 else
4171 es->s_kbytes_written =
4172 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written);
57042651
TT		 4173 ext4_free_blocks_count_set(es,
4174 EXT4_C2B(EXT4_SB(sb), percpu_counter_sum_positive(
4175 &EXT4_SB(sb)->s_freeclusters_counter)));
ce7e010a
TT		 4176 es->s_free_inodes_count =
4177 cpu_to_le32(percpu_counter_sum_positive(
4178 &EXT4_SB(sb)->s_freeinodes_counter));
7234ab2a 4179 sb->s_dirt = 0;
ac27a0ec
DK		 4180 BUFFER_TRACE(sbh, "marking dirty");
4181 mark_buffer_dirty(sbh);
914258bf 4182 if (sync) {
c4be0c1d
TS		 4183 error = sync_dirty_buffer(sbh);
4184 if (error)
4185 return error;
4186
4187 error = buffer_write_io_error(sbh);
4188 if (error) {
b31e1552
ES		 4189 ext4_msg(sb, KERN_ERR, "I/O error while writing "
4190 "superblock");
914258bf
TT		 4191 clear_buffer_write_io_error(sbh);
4192 set_buffer_uptodate(sbh);
4193 }
4194 }
c4be0c1d 4195 return error;
ac27a0ec
DK		 4196}
4197
ac27a0ec
DK		 4198/*
4199 * Have we just finished recovery? If so, and if we are mounting (or
4200 * remounting) the filesystem readonly, then we will end up with a
4201 * consistent fs on disk. Record that fact.
4202 */
2b2d6d01
TT		 4203static void ext4_mark_recovery_complete(struct super_block *sb,
4204 struct ext4_super_block *es)
ac27a0ec 4205{
617ba13b 4206 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 4207
0390131b
FM		 4208 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
4209 BUG_ON(journal != NULL);
4210 return;
4211 }
dab291af 4212 jbd2_journal_lock_updates(journal);
7ffe1ea8
HK		 4213 if (jbd2_journal_flush(journal) < 0)
4214 goto out;
4215
617ba13b 4216 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
ac27a0ec 4217 sb->s_flags & MS_RDONLY) {
617ba13b 4218 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
e2d67052 4219 ext4_commit_super(sb, 1);
ac27a0ec 4220 }
7ffe1ea8
HK		 4221
4222out:
dab291af 4223 jbd2_journal_unlock_updates(journal);
ac27a0ec
DK		 4224}
4225
4226/*
4227 * If we are mounting (or read-write remounting) a filesystem whose journal
4228 * has recorded an error from a previous lifetime, move that error to the
4229 * main filesystem now.
4230 */
2b2d6d01
TT		 4231static void ext4_clear_journal_err(struct super_block *sb,
4232 struct ext4_super_block *es)
ac27a0ec
DK		 4233{
4234 journal_t *journal;
4235 int j_errno;
4236 const char *errstr;
4237
0390131b
FM		 4238 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4239
617ba13b 4240 journal = EXT4_SB(sb)->s_journal;
ac27a0ec
DK		 4241
4242 /*
4243 * Now check for any error status which may have been recorded in the
617ba13b 4244 * journal by a prior ext4_error() or ext4_abort()
ac27a0ec
DK		 4245 */
4246
dab291af 4247 j_errno = jbd2_journal_errno(journal);
ac27a0ec
DK		 4248 if (j_errno) {
4249 char nbuf[16];
4250
617ba13b 4251 errstr = ext4_decode_error(sb, j_errno, nbuf);
12062ddd 4252 ext4_warning(sb, "Filesystem error recorded "
ac27a0ec 4253 "from previous mount: %s", errstr);
12062ddd 4254 ext4_warning(sb, "Marking fs in need of filesystem check.");
ac27a0ec 4255
617ba13b
MC		 4256 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
4257 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
e2d67052 4258 ext4_commit_super(sb, 1);
ac27a0ec 4259
dab291af 4260 jbd2_journal_clear_err(journal);
ac27a0ec
DK		 4261 }
4262}
4263
4264/*
4265 * Force the running and committing transactions to commit,
4266 * and wait on the commit.
4267 */
617ba13b 4268int ext4_force_commit(struct super_block *sb)
ac27a0ec
DK		 4269{
4270 journal_t *journal;
0390131b 4271 int ret = 0;
ac27a0ec
DK		 4272
4273 if (sb->s_flags & MS_RDONLY)
4274 return 0;
4275
617ba13b 4276 journal = EXT4_SB(sb)->s_journal;
6b0310fb 4277 if (journal) {
437f88cc 4278 vfs_check_frozen(sb, SB_FREEZE_TRANS);
0390131b 4279 ret = ext4_journal_force_commit(journal);
6b0310fb 4280 }
0390131b 4281
ac27a0ec
DK		 4282 return ret;
4283}
4284
2b2d6d01 4285static void ext4_write_super(struct super_block *sb)
ac27a0ec 4286{
ebc1ac16 4287 lock_super(sb);
9ca92389 4288 ext4_commit_super(sb, 1);
ebc1ac16 4289 unlock_super(sb);
ac27a0ec
DK		 4290}
4291
617ba13b 4292static int ext4_sync_fs(struct super_block *sb, int wait)
ac27a0ec 4293{
14ce0cb4 4294 int ret = 0;
9eddacf9 4295 tid_t target;
8d5d02e6 4296 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4297
9bffad1e 4298 trace_ext4_sync_fs(sb, wait);
8d5d02e6
MC		 4299 flush_workqueue(sbi->dio_unwritten_wq);
4300 if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
9ca92389 4301 if (wait)
8d5d02e6 4302 jbd2_log_wait_commit(sbi->s_journal, target);
0390131b 4303 }
14ce0cb4 4304 return ret;
ac27a0ec
DK		 4305}
4306
4307/*
4308 * LVM calls this function before a (read-only) snapshot is created. This
4309 * gives us a chance to flush the journal completely and mark the fs clean.
be4f27d3
YY		 4310 *
4311 * Note that only this function cannot bring a filesystem to be in a clean
4312 * state independently, because ext4 prevents a new handle from being started
4313 * by @sb->s_frozen, which stays in an upper layer. It thus needs help from
4314 * the upper layer.
ac27a0ec 4315 */
c4be0c1d 4316static int ext4_freeze(struct super_block *sb)
ac27a0ec 4317{
c4be0c1d
TS		 4318 int error = 0;
4319 journal_t *journal;
ac27a0ec 4320
9ca92389
TT		 4321 if (sb->s_flags & MS_RDONLY)
4322 return 0;
ac27a0ec 4323
9ca92389 4324 journal = EXT4_SB(sb)->s_journal;
7ffe1ea8 4325
9ca92389
TT		 4326 /* Now we set up the journal barrier. */
4327 jbd2_journal_lock_updates(journal);
ac27a0ec 4328
9ca92389
TT		 4329 /*
4330 * Don't clear the needs_recovery flag if we failed to flush
4331 * the journal.
4332 */
4333 error = jbd2_journal_flush(journal);
6b0310fb
ES		 4334 if (error < 0)
4335 goto out;
9ca92389
TT		 4336
4337 /* Journal blocked and flushed, clear needs_recovery flag. */
4338 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4339 error = ext4_commit_super(sb, 1);
6b0310fb
ES		 4340out:
4341 /* we rely on s_frozen to stop further updates */
4342 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
4343 return error;
ac27a0ec
DK		 4344}
4345
4346/*
4347 * Called by LVM after the snapshot is done. We need to reset the RECOVER
4348 * flag here, even though the filesystem is not technically dirty yet.
4349 */
c4be0c1d 4350static int ext4_unfreeze(struct super_block *sb)
ac27a0ec 4351{
9ca92389
TT		 4352 if (sb->s_flags & MS_RDONLY)
4353 return 0;
4354
4355 lock_super(sb);
4356 /* Reset the needs_recovery flag before the fs is unlocked. */
4357 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4358 ext4_commit_super(sb, 1);
4359 unlock_super(sb);
c4be0c1d 4360 return 0;
ac27a0ec
DK		 4361}
4362
673c6100
TT		 4363/*
4364 * Structure to save mount options for ext4_remount's benefit
4365 */
4366struct ext4_mount_options {
4367 unsigned long s_mount_opt;
a2595b8a 4368 unsigned long s_mount_opt2;
673c6100
TT		 4369 uid_t s_resuid;
4370 gid_t s_resgid;
4371 unsigned long s_commit_interval;
4372 u32 s_min_batch_time, s_max_batch_time;
4373#ifdef CONFIG_QUOTA
4374 int s_jquota_fmt;
4375 char *s_qf_names[MAXQUOTAS];
4376#endif
4377};
4378
2b2d6d01 4379static int ext4_remount(struct super_block *sb, int *flags, char *data)
ac27a0ec 4380{
2b2d6d01 4381 struct ext4_super_block *es;
617ba13b
MC		 4382 struct ext4_sb_info *sbi = EXT4_SB(sb);
4383 ext4_fsblk_t n_blocks_count = 0;
ac27a0ec 4384 unsigned long old_sb_flags;
617ba13b 4385 struct ext4_mount_options old_opts;
c79d967d 4386 int enable_quota = 0;
8a266467 4387 ext4_group_t g;
b3881f74 4388 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
c5e06d10 4389 int err = 0;
ac27a0ec
DK		 4390#ifdef CONFIG_QUOTA
4391 int i;
4392#endif
d4c402d9 4393 char *orig_data = kstrdup(data, GFP_KERNEL);
ac27a0ec
DK		 4394
4395 /* Store the original options */
bbd6851a 4396 lock_super(sb);
ac27a0ec
DK		 4397 old_sb_flags = sb->s_flags;
4398 old_opts.s_mount_opt = sbi->s_mount_opt;
a2595b8a 4399 old_opts.s_mount_opt2 = sbi->s_mount_opt2;
ac27a0ec
DK		 4400 old_opts.s_resuid = sbi->s_resuid;
4401 old_opts.s_resgid = sbi->s_resgid;
4402 old_opts.s_commit_interval = sbi->s_commit_interval;
30773840
TT		 4403 old_opts.s_min_batch_time = sbi->s_min_batch_time;
4404 old_opts.s_max_batch_time = sbi->s_max_batch_time;
ac27a0ec
DK		 4405#ifdef CONFIG_QUOTA
4406 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
4407 for (i = 0; i < MAXQUOTAS; i++)
4408 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
4409#endif
b3881f74
TT		 4410 if (sbi->s_journal && sbi->s_journal->j_task->io_context)
4411 journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
ac27a0ec
DK		 4412
4413 /*
4414 * Allow the "check" option to be passed as a remount option.
4415 */
b3881f74
TT		 4416 if (!parse_options(data, sb, NULL, &journal_ioprio,
4417 &n_blocks_count, 1)) {
ac27a0ec
DK		 4418 err = -EINVAL;
4419 goto restore_opts;
4420 }
4421
4ab2f15b 4422 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
c67d859e 4423 ext4_abort(sb, "Abort forced by user");
ac27a0ec
DK		 4424
4425 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
482a7425 4426 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec
DK		 4427
4428 es = sbi->s_es;
4429
b3881f74 4430 if (sbi->s_journal) {
0390131b 4431 ext4_init_journal_params(sb, sbi->s_journal);
b3881f74
TT		 4432 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
4433 }
ac27a0ec
DK		 4434
4435 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
bd81d8ee 4436 n_blocks_count > ext4_blocks_count(es)) {
4ab2f15b 4437 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) {
ac27a0ec
DK		 4438 err = -EROFS;
4439 goto restore_opts;
4440 }
4441
4442 if (*flags & MS_RDONLY) {
0f0dd62f
CH		 4443 err = dquot_suspend(sb, -1);
4444 if (err < 0)
c79d967d 4445 goto restore_opts;
c79d967d 4446
ac27a0ec
DK		 4447 /*
4448 * First of all, the unconditional stuff we have to do
4449 * to disable replay of the journal when we next remount
4450 */
4451 sb->s_flags |= MS_RDONLY;
4452
4453 /*
4454 * OK, test if we are remounting a valid rw partition
4455 * readonly, and if so set the rdonly flag and then
4456 * mark the partition as valid again.
4457 */
617ba13b
MC		 4458 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
4459 (sbi->s_mount_state & EXT4_VALID_FS))
ac27a0ec
DK		 4460 es->s_state = cpu_to_le16(sbi->s_mount_state);
4461
a63c9eb2 4462 if (sbi->s_journal)
0390131b 4463 ext4_mark_recovery_complete(sb, es);
ac27a0ec 4464 } else {
a13fb1a4
ES		 4465 /* Make sure we can mount this feature set readwrite */
4466 if (!ext4_feature_set_ok(sb, 0)) {
ac27a0ec
DK		 4467 err = -EROFS;
4468 goto restore_opts;
4469 }
8a266467
TT		 4470 /*
4471 * Make sure the group descriptor checksums
0b8e58a1 4472 * are sane. If they aren't, refuse to remount r/w.
8a266467
TT		 4473 */
4474 for (g = 0; g < sbi->s_groups_count; g++) {
4475 struct ext4_group_desc *gdp =
4476 ext4_get_group_desc(sb, g, NULL);
4477
4478 if (!ext4_group_desc_csum_verify(sbi, g, gdp)) {
b31e1552
ES		 4479 ext4_msg(sb, KERN_ERR,
4480 "ext4_remount: Checksum for group %u failed (%u!=%u)",
8a266467
TT		 4481 g, le16_to_cpu(ext4_group_desc_csum(sbi, g, gdp)),
4482 le16_to_cpu(gdp->bg_checksum));
4483 err = -EINVAL;
4484 goto restore_opts;
4485 }
4486 }
4487
ead6596b
ES		 4488 /*
4489 * If we have an unprocessed orphan list hanging
4490 * around from a previously readonly bdev mount,
4491 * require a full umount/remount for now.
4492 */
4493 if (es->s_last_orphan) {
b31e1552 4494 ext4_msg(sb, KERN_WARNING, "Couldn't "
ead6596b
ES		 4495 "remount RDWR because of unprocessed "
4496 "orphan inode list. Please "
b31e1552 4497 "umount/remount instead");
ead6596b
ES		 4498 err = -EINVAL;
4499 goto restore_opts;
4500 }
4501
ac27a0ec
DK		 4502 /*
4503 * Mounting a RDONLY partition read-write, so reread
4504 * and store the current valid flag. (It may have
4505 * been changed by e2fsck since we originally mounted
4506 * the partition.)
4507 */
0390131b
FM		 4508 if (sbi->s_journal)
4509 ext4_clear_journal_err(sb, es);
ac27a0ec 4510 sbi->s_mount_state = le16_to_cpu(es->s_state);
617ba13b 4511 if ((err = ext4_group_extend(sb, es, n_blocks_count)))
ac27a0ec 4512 goto restore_opts;
2b2d6d01 4513 if (!ext4_setup_super(sb, es, 0))
ac27a0ec 4514 sb->s_flags &= ~MS_RDONLY;
c5e06d10
JL		 4515 if (EXT4_HAS_INCOMPAT_FEATURE(sb,
4516 EXT4_FEATURE_INCOMPAT_MMP))
4517 if (ext4_multi_mount_protect(sb,
4518 le64_to_cpu(es->s_mmp_block))) {
4519 err = -EROFS;
4520 goto restore_opts;
4521 }
c79d967d 4522 enable_quota = 1;
ac27a0ec
DK		 4523 }
4524 }
bfff6873
LC		 4525
4526 /*
4527 * Reinitialize lazy itable initialization thread based on
4528 * current settings
4529 */
4530 if ((sb->s_flags & MS_RDONLY) || !test_opt(sb, INIT_INODE_TABLE))
4531 ext4_unregister_li_request(sb);
4532 else {
4533 ext4_group_t first_not_zeroed;
4534 first_not_zeroed = ext4_has_uninit_itable(sb);
4535 ext4_register_li_request(sb, first_not_zeroed);
4536 }
4537
6fd058f7 4538 ext4_setup_system_zone(sb);
0390131b 4539 if (sbi->s_journal == NULL)
e2d67052 4540 ext4_commit_super(sb, 1);
0390131b 4541
ac27a0ec
DK		 4542#ifdef CONFIG_QUOTA
4543 /* Release old quota file names */
4544 for (i = 0; i < MAXQUOTAS; i++)
4545 if (old_opts.s_qf_names[i] &&
4546 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
4547 kfree(old_opts.s_qf_names[i]);
4548#endif
bbd6851a 4549 unlock_super(sb);
c79d967d 4550 if (enable_quota)
0f0dd62f 4551 dquot_resume(sb, -1);
d4c402d9
CW		 4552
4553 ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s", orig_data);
4554 kfree(orig_data);
ac27a0ec 4555 return 0;
0b8e58a1 4556
ac27a0ec
DK		 4557restore_opts:
4558 sb->s_flags = old_sb_flags;
4559 sbi->s_mount_opt = old_opts.s_mount_opt;
a2595b8a 4560 sbi->s_mount_opt2 = old_opts.s_mount_opt2;
ac27a0ec
DK		 4561 sbi->s_resuid = old_opts.s_resuid;
4562 sbi->s_resgid = old_opts.s_resgid;
4563 sbi->s_commit_interval = old_opts.s_commit_interval;
30773840
TT		 4564 sbi->s_min_batch_time = old_opts.s_min_batch_time;
4565 sbi->s_max_batch_time = old_opts.s_max_batch_time;
ac27a0ec
DK		 4566#ifdef CONFIG_QUOTA
4567 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
4568 for (i = 0; i < MAXQUOTAS; i++) {
4569 if (sbi->s_qf_names[i] &&
4570 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
4571 kfree(sbi->s_qf_names[i]);
4572 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
4573 }
4574#endif
bbd6851a 4575 unlock_super(sb);
d4c402d9 4576 kfree(orig_data);
ac27a0ec
DK		 4577 return err;
4578}
4579
f975d6bc
TT		 4580/*
4581 * Note: calculating the overhead so we can be compatible with
4582 * historical BSD practice is quite difficult in the face of
4583 * clusters/bigalloc. This is because multiple metadata blocks from
4584 * different block group can end up in the same allocation cluster.
4585 * Calculating the exact overhead in the face of clustered allocation
4586 * requires either O(all block bitmaps) in memory or O(number of block
4587 * groups**2) in time. We will still calculate the superblock for
4588 * older file systems --- and if we come across with a bigalloc file
4589 * system with zero in s_overhead_clusters the estimate will be close to
4590 * correct especially for very large cluster sizes --- but for newer
4591 * file systems, it's better to calculate this figure once at mkfs
4592 * time, and store it in the superblock. If the superblock value is
4593 * present (even for non-bigalloc file systems), we will use it.
4594 */
2b2d6d01 4595static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
ac27a0ec
DK		 4596{
4597 struct super_block *sb = dentry->d_sb;
617ba13b
MC		 4598 struct ext4_sb_info *sbi = EXT4_SB(sb);
4599 struct ext4_super_block *es = sbi->s_es;
f975d6bc 4600 struct ext4_group_desc *gdp;
960cc398 4601 u64 fsid;
d02a9391 4602 s64 bfree;
ac27a0ec 4603
5e70030d
BP		 4604 if (test_opt(sb, MINIX_DF)) {
4605 sbi->s_overhead_last = 0;
f975d6bc
TT		 4606 } else if (es->s_overhead_clusters) {
4607 sbi->s_overhead_last = le32_to_cpu(es->s_overhead_clusters);
6bc9feff 4608 } else if (sbi->s_blocks_last != ext4_blocks_count(es)) {
8df9675f 4609 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
5e70030d 4610 ext4_fsblk_t overhead = 0;
ac27a0ec
DK		 4611
4612 /*
5e70030d
BP		 4613 * Compute the overhead (FS structures). This is constant
4614 * for a given filesystem unless the number of block groups
4615 * changes so we cache the previous value until it does.
ac27a0ec
DK		 4616 */
4617
4618 /*
4619 * All of the blocks before first_data_block are
4620 * overhead
4621 */
f975d6bc 4622 overhead = EXT4_B2C(sbi, le32_to_cpu(es->s_first_data_block));
ac27a0ec
DK		 4623
4624 /*
f975d6bc 4625 * Add the overhead found in each block group
ac27a0ec
DK		 4626 */
4627 for (i = 0; i < ngroups; i++) {
f975d6bc
TT		 4628 gdp = ext4_get_group_desc(sb, i, NULL);
4629 overhead += ext4_num_overhead_clusters(sb, i, gdp);
ac27a0ec
DK		 4630 cond_resched();
4631 }
5e70030d
BP		 4632 sbi->s_overhead_last = overhead;
4633 smp_wmb();
6bc9feff 4634 sbi->s_blocks_last = ext4_blocks_count(es);
ac27a0ec
DK		 4635 }
4636
617ba13b 4637 buf->f_type = EXT4_SUPER_MAGIC;
ac27a0ec 4638 buf->f_bsize = sb->s_blocksize;
f975d6bc
TT		 4639 buf->f_blocks = (ext4_blocks_count(es) -
4640 EXT4_C2B(sbi, sbi->s_overhead_last));
57042651
TT		 4641 bfree = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) -
4642 percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter);
d02a9391 4643 /* prevent underflow in case that few free space is available */
57042651 4644 buf->f_bfree = EXT4_C2B(sbi, max_t(s64, bfree, 0));
bd81d8ee
LV		 4645 buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es);
4646 if (buf->f_bfree < ext4_r_blocks_count(es))
ac27a0ec
DK		 4647 buf->f_bavail = 0;
4648 buf->f_files = le32_to_cpu(es->s_inodes_count);
52d9f3b4 4649 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
617ba13b 4650 buf->f_namelen = EXT4_NAME_LEN;
960cc398
PE		 4651 fsid = le64_to_cpup((void *)es->s_uuid) ^
4652 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
4653 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
4654 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
0b8e58a1 4655
ac27a0ec
DK		 4656 return 0;
4657}
4658
0b8e58a1
AD		 4659/* Helper function for writing quotas on sync - we need to start transaction
4660 * before quota file is locked for write. Otherwise the are possible deadlocks:
ac27a0ec 4661 * Process 1 Process 2
617ba13b 4662 * ext4_create() quota_sync()
a269eb18 4663 * jbd2_journal_start() write_dquot()
871a2931 4664 * dquot_initialize() down(dqio_mutex)
dab291af 4665 * down(dqio_mutex) jbd2_journal_start()
ac27a0ec
DK		 4666 *
4667 */
4668
4669#ifdef CONFIG_QUOTA
4670
4671static inline struct inode *dquot_to_inode(struct dquot *dquot)
4672{
4673 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
4674}
4675
617ba13b 4676static int ext4_write_dquot(struct dquot *dquot)
ac27a0ec
DK		 4677{
4678 int ret, err;
4679 handle_t *handle;
4680 struct inode *inode;
4681
4682 inode = dquot_to_inode(dquot);
617ba13b 4683 handle = ext4_journal_start(inode,
0b8e58a1 4684 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 4685 if (IS_ERR(handle))
4686 return PTR_ERR(handle);
4687 ret = dquot_commit(dquot);
617ba13b 4688 err = ext4_journal_stop(handle);
ac27a0ec
DK		 4689 if (!ret)
4690 ret = err;
4691 return ret;
4692}
4693
617ba13b 4694static int ext4_acquire_dquot(struct dquot *dquot)
ac27a0ec
DK		 4695{
4696 int ret, err;
4697 handle_t *handle;
4698
617ba13b 4699 handle = ext4_journal_start(dquot_to_inode(dquot),
0b8e58a1 4700 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 4701 if (IS_ERR(handle))
4702 return PTR_ERR(handle);
4703 ret = dquot_acquire(dquot);
617ba13b 4704 err = ext4_journal_stop(handle);
ac27a0ec
DK		 4705 if (!ret)
4706 ret = err;
4707 return ret;
4708}
4709
617ba13b 4710static int ext4_release_dquot(struct dquot *dquot)
ac27a0ec
DK		 4711{
4712 int ret, err;
4713 handle_t *handle;
4714
617ba13b 4715 handle = ext4_journal_start(dquot_to_inode(dquot),
0b8e58a1 4716 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
9c3013e9
JK		 4717 if (IS_ERR(handle)) {
4718 /* Release dquot anyway to avoid endless cycle in dqput() */
4719 dquot_release(dquot);
ac27a0ec 4720 return PTR_ERR(handle);
9c3013e9 4721 }
ac27a0ec 4722 ret = dquot_release(dquot);
617ba13b 4723 err = ext4_journal_stop(handle);
ac27a0ec
DK		 4724 if (!ret)
4725 ret = err;
4726 return ret;
4727}
4728
617ba13b 4729static int ext4_mark_dquot_dirty(struct dquot *dquot)
ac27a0ec 4730{
2c8be6b2 4731 /* Are we journaling quotas? */
617ba13b
MC		 4732 if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
4733 EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
ac27a0ec 4734 dquot_mark_dquot_dirty(dquot);
617ba13b 4735 return ext4_write_dquot(dquot);
ac27a0ec
DK		 4736 } else {
4737 return dquot_mark_dquot_dirty(dquot);
4738 }
4739}
4740
617ba13b 4741static int ext4_write_info(struct super_block *sb, int type)
ac27a0ec
DK		 4742{
4743 int ret, err;
4744 handle_t *handle;
4745
4746 /* Data block + inode block */
617ba13b 4747 handle = ext4_journal_start(sb->s_root->d_inode, 2);
ac27a0ec
DK		 4748 if (IS_ERR(handle))
4749 return PTR_ERR(handle);
4750 ret = dquot_commit_info(sb, type);
617ba13b 4751 err = ext4_journal_stop(handle);
ac27a0ec
DK		 4752 if (!ret)
4753 ret = err;
4754 return ret;
4755}
4756
4757/*
4758 * Turn on quotas during mount time - we need to find
4759 * the quota file and such...
4760 */
617ba13b 4761static int ext4_quota_on_mount(struct super_block *sb, int type)
ac27a0ec 4762{
287a8095
CH		 4763 return dquot_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
4764 EXT4_SB(sb)->s_jquota_fmt, type);
ac27a0ec
DK		 4765}
4766
4767/*
4768 * Standard function to be called on quota_on
4769 */
617ba13b 4770static int ext4_quota_on(struct super_block *sb, int type, int format_id,
f00c9e44 4771 struct path *path)
ac27a0ec
DK		 4772{
4773 int err;
ac27a0ec
DK		 4774
4775 if (!test_opt(sb, QUOTA))
4776 return -EINVAL;
0623543b 4777
ac27a0ec 4778 /* Quotafile not on the same filesystem? */
d8c9584e 4779 if (path->dentry->d_sb != sb)
ac27a0ec 4780 return -EXDEV;
0623543b
JK		 4781 /* Journaling quota? */
4782 if (EXT4_SB(sb)->s_qf_names[type]) {
2b2d6d01 4783 /* Quotafile not in fs root? */
f00c9e44 4784 if (path->dentry->d_parent != sb->s_root)
b31e1552
ES		 4785 ext4_msg(sb, KERN_WARNING,
4786 "Quota file not on filesystem root. "
4787 "Journaled quota will not work");
2b2d6d01 4788 }
0623543b
JK		 4789
4790 /*
4791 * When we journal data on quota file, we have to flush journal to see
4792 * all updates to the file when we bypass pagecache...
4793 */
0390131b 4794 if (EXT4_SB(sb)->s_journal &&
f00c9e44 4795 ext4_should_journal_data(path->dentry->d_inode)) {
0623543b
JK		 4796 /*
4797 * We don't need to lock updates but journal_flush() could
4798 * otherwise be livelocked...
4799 */
4800 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
7ffe1ea8 4801 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
0623543b 4802 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
f00c9e44 4803 if (err)
7ffe1ea8 4804 return err;
0623543b
JK		 4805 }
4806
f00c9e44 4807 return dquot_quota_on(sb, type, format_id, path);
ac27a0ec
DK		 4808}
4809
ca0e05e4
DM		 4810static int ext4_quota_off(struct super_block *sb, int type)
4811{
21f97697
JK		 4812 struct inode *inode = sb_dqopt(sb)->files[type];
4813 handle_t *handle;
4814
87009d86
DM		 4815 /* Force all delayed allocation blocks to be allocated.
4816 * Caller already holds s_umount sem */
4817 if (test_opt(sb, DELALLOC))
ca0e05e4 4818 sync_filesystem(sb);
ca0e05e4 4819
0b268590
AG		 4820 if (!inode)
4821 goto out;
4822
21f97697
JK		 4823 /* Update modification times of quota files when userspace can
4824 * start looking at them */
4825 handle = ext4_journal_start(inode, 1);
4826 if (IS_ERR(handle))
4827 goto out;
4828 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
4829 ext4_mark_inode_dirty(handle, inode);
4830 ext4_journal_stop(handle);
4831
4832out:
ca0e05e4
DM		 4833 return dquot_quota_off(sb, type);
4834}
4835
ac27a0ec
DK		 4836/* Read data from quotafile - avoid pagecache and such because we cannot afford
4837 * acquiring the locks... As quota files are never truncated and quota code
25985edc 4838 * itself serializes the operations (and no one else should touch the files)
ac27a0ec 4839 * we don't have to be afraid of races */
617ba13b 4840static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec
DK		 4841 size_t len, loff_t off)
4842{
4843 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 4844 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 4845 int err = 0;
4846 int offset = off & (sb->s_blocksize - 1);
4847 int tocopy;
4848 size_t toread;
4849 struct buffer_head *bh;
4850 loff_t i_size = i_size_read(inode);
4851
4852 if (off > i_size)
4853 return 0;
4854 if (off+len > i_size)
4855 len = i_size-off;
4856 toread = len;
4857 while (toread > 0) {
4858 tocopy = sb->s_blocksize - offset < toread ?
4859 sb->s_blocksize - offset : toread;
617ba13b 4860 bh = ext4_bread(NULL, inode, blk, 0, &err);
ac27a0ec
DK		 4861 if (err)
4862 return err;
4863 if (!bh) /* A hole? */
4864 memset(data, 0, tocopy);
4865 else
4866 memcpy(data, bh->b_data+offset, tocopy);
4867 brelse(bh);
4868 offset = 0;
4869 toread -= tocopy;
4870 data += tocopy;
4871 blk++;
4872 }
4873 return len;
4874}
4875
4876/* Write to quotafile (we know the transaction is already started and has
4877 * enough credits) */
617ba13b 4878static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec
DK		 4879 const char *data, size_t len, loff_t off)
4880{
4881 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 4882 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 4883 int err = 0;
4884 int offset = off & (sb->s_blocksize - 1);
ac27a0ec
DK		 4885 struct buffer_head *bh;
4886 handle_t *handle = journal_current_handle();
4887
0390131b 4888 if (EXT4_SB(sb)->s_journal && !handle) {
b31e1552
ES		 4889 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
4890 " cancelled because transaction is not started",
9c3013e9
JK		 4891 (unsigned long long)off, (unsigned long long)len);
4892 return -EIO;
4893 }
67eeb568
DM		 4894 /*
4895 * Since we account only one data block in transaction credits,
4896 * then it is impossible to cross a block boundary.
4897 */
4898 if (sb->s_blocksize - offset < len) {
4899 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
4900 " cancelled because not block aligned",
4901 (unsigned long long)off, (unsigned long long)len);
4902 return -EIO;
4903 }
4904
ac27a0ec 4905 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
67eeb568
DM		 4906 bh = ext4_bread(handle, inode, blk, 1, &err);
4907 if (!bh)
4908 goto out;
62d2b5f2
JK		 4909 err = ext4_journal_get_write_access(handle, bh);
4910 if (err) {
4911 brelse(bh);
4912 goto out;
ac27a0ec 4913 }
67eeb568
DM		 4914 lock_buffer(bh);
4915 memcpy(bh->b_data+offset, data, len);
4916 flush_dcache_page(bh->b_page);
4917 unlock_buffer(bh);
62d2b5f2 4918 err = ext4_handle_dirty_metadata(handle, NULL, bh);
67eeb568 4919 brelse(bh);
ac27a0ec 4920out:
67eeb568 4921 if (err) {
4d04e4fb 4922 mutex_unlock(&inode->i_mutex);
ac27a0ec 4923 return err;
4d04e4fb 4924 }
67eeb568
DM		 4925 if (inode->i_size < off + len) {
4926 i_size_write(inode, off + len);
617ba13b 4927 EXT4_I(inode)->i_disksize = inode->i_size;
21f97697 4928 ext4_mark_inode_dirty(handle, inode);
ac27a0ec 4929 }
ac27a0ec 4930 mutex_unlock(&inode->i_mutex);
67eeb568 4931 return len;
ac27a0ec
DK		 4932}
4933
4934#endif
4935
152a0836
AV		 4936static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
4937 const char *dev_name, void *data)
ac27a0ec 4938{
152a0836 4939 return mount_bdev(fs_type, flags, dev_name, data, ext4_fill_super);
ac27a0ec
DK		 4940}
4941
37f328eb 4942#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
24b58424
TT		 4943static inline void register_as_ext2(void)
4944{
4945 int err = register_filesystem(&ext2_fs_type);
4946 if (err)
4947 printk(KERN_WARNING
4948 "EXT4-fs: Unable to register as ext2 (%d)\n", err);
4949}
4950
4951static inline void unregister_as_ext2(void)
4952{
4953 unregister_filesystem(&ext2_fs_type);
4954}
2035e776
TT		 4955
4956static inline int ext2_feature_set_ok(struct super_block *sb)
4957{
4958 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP))
4959 return 0;
4960 if (sb->s_flags & MS_RDONLY)
4961 return 1;
4962 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))
4963 return 0;
4964 return 1;
4965}
51b7e3c9 4966MODULE_ALIAS("ext2");
24b58424
TT		 4967#else
4968static inline void register_as_ext2(void) { }
4969static inline void unregister_as_ext2(void) { }
2035e776 4970static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; }
24b58424
TT		 4971#endif
4972
37f328eb 4973#if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
24b58424
TT		 4974static inline void register_as_ext3(void)
4975{
4976 int err = register_filesystem(&ext3_fs_type);
4977 if (err)
4978 printk(KERN_WARNING
4979 "EXT4-fs: Unable to register as ext3 (%d)\n", err);
4980}
4981
4982static inline void unregister_as_ext3(void)
4983{
4984 unregister_filesystem(&ext3_fs_type);
4985}
2035e776
TT		 4986
4987static inline int ext3_feature_set_ok(struct super_block *sb)
4988{
4989 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP))
4990 return 0;
4991 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
4992 return 0;
4993 if (sb->s_flags & MS_RDONLY)
4994 return 1;
4995 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP))
4996 return 0;
4997 return 1;
4998}
51b7e3c9 4999MODULE_ALIAS("ext3");
24b58424
TT		 5000#else
5001static inline void register_as_ext3(void) { }
5002static inline void unregister_as_ext3(void) { }
2035e776 5003static inline int ext3_feature_set_ok(struct super_block *sb) { return 0; }
24b58424
TT		 5004#endif
5005
03010a33
TT		 5006static struct file_system_type ext4_fs_type = {
5007 .owner = THIS_MODULE,
5008 .name = "ext4",
152a0836 5009 .mount = ext4_mount,
03010a33
TT		 5010 .kill_sb = kill_block_super,
5011 .fs_flags = FS_REQUIRES_DEV,
5012};
5013
8f021222 5014static int __init ext4_init_feat_adverts(void)
857ac889
LC		 5015{
5016 struct ext4_features *ef;
5017 int ret = -ENOMEM;
5018
5019 ef = kzalloc(sizeof(struct ext4_features), GFP_KERNEL);
5020 if (!ef)
5021 goto out;
5022
5023 ef->f_kobj.kset = ext4_kset;
5024 init_completion(&ef->f_kobj_unregister);
5025 ret = kobject_init_and_add(&ef->f_kobj, &ext4_feat_ktype, NULL,
5026 "features");
5027 if (ret) {
5028 kfree(ef);
5029 goto out;
5030 }
5031
5032 ext4_feat = ef;
5033 ret = 0;
5034out:
5035 return ret;
5036}
5037
8f021222
LC		 5038static void ext4_exit_feat_adverts(void)
5039{
5040 kobject_put(&ext4_feat->f_kobj);
5041 wait_for_completion(&ext4_feat->f_kobj_unregister);
5042 kfree(ext4_feat);
5043}
5044
e9e3bcec
ES		 5045/* Shared across all ext4 file systems */
5046wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
5047struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ];
5048
5dabfc78 5049static int __init ext4_init_fs(void)
ac27a0ec 5050{
e9e3bcec 5051 int i, err;
c9de560d 5052
12e9b892 5053 ext4_check_flag_values();
e9e3bcec
ES		 5054
5055 for (i = 0; i < EXT4_WQ_HASH_SZ; i++) {
5056 mutex_init(&ext4__aio_mutex[i]);
5057 init_waitqueue_head(&ext4__ioend_wq[i]);
5058 }
5059
5dabfc78 5060 err = ext4_init_pageio();
6fd058f7
TT		 5061 if (err)
5062 return err;
5dabfc78 5063 err = ext4_init_system_zone();
bd2d0210 5064 if (err)
d44651d0 5065 goto out6;
3197ebdb
TT		 5066 ext4_kset = kset_create_and_add("ext4", NULL, fs_kobj);
5067 if (!ext4_kset)
dd68314c 5068 goto out5;
d44651d0 5069 ext4_proc_root = proc_mkdir("fs/ext4", NULL);
857ac889
LC		 5070
5071 err = ext4_init_feat_adverts();
dd68314c
TT		 5072 if (err)
5073 goto out4;
857ac889 5074
5dabfc78 5075 err = ext4_init_mballoc();
ac27a0ec 5076 if (err)
6fd058f7 5077 goto out3;
c9de560d 5078
5dabfc78 5079 err = ext4_init_xattr();
c9de560d
AT		 5080 if (err)
5081 goto out2;
ac27a0ec
DK		 5082 err = init_inodecache();
5083 if (err)
5084 goto out1;
24b58424 5085 register_as_ext3();
2035e776 5086 register_as_ext2();
03010a33 5087 err = register_filesystem(&ext4_fs_type);
ac27a0ec
DK		 5088 if (err)
5089 goto out;
bfff6873
LC		 5090
5091 ext4_li_info = NULL;
5092 mutex_init(&ext4_li_mtx);
ac27a0ec
DK		 5093 return 0;
5094out:
24b58424
TT		 5095 unregister_as_ext2();
5096 unregister_as_ext3();
ac27a0ec
DK		 5097 destroy_inodecache();
5098out1:
5dabfc78 5099 ext4_exit_xattr();
c9de560d 5100out2:
5dabfc78 5101 ext4_exit_mballoc();
6fd058f7 5102out3:
8f021222 5103 ext4_exit_feat_adverts();
dd68314c 5104out4:
d44651d0
FJ		 5105 if (ext4_proc_root)
5106 remove_proc_entry("fs/ext4", NULL);
6fd058f7 5107 kset_unregister(ext4_kset);
d44651d0 5108out5:
5dabfc78 5109 ext4_exit_system_zone();
d44651d0 5110out6:
5dabfc78 5111 ext4_exit_pageio();
ac27a0ec
DK		 5112 return err;
5113}
5114
5dabfc78 5115static void __exit ext4_exit_fs(void)
ac27a0ec 5116{
bfff6873 5117 ext4_destroy_lazyinit_thread();
24b58424
TT		 5118 unregister_as_ext2();
5119 unregister_as_ext3();
03010a33 5120 unregister_filesystem(&ext4_fs_type);
ac27a0ec 5121 destroy_inodecache();
5dabfc78
TT		 5122 ext4_exit_xattr();
5123 ext4_exit_mballoc();
8f021222 5124 ext4_exit_feat_adverts();
9f6200bb 5125 remove_proc_entry("fs/ext4", NULL);
3197ebdb 5126 kset_unregister(ext4_kset);
5dabfc78
TT		 5127 ext4_exit_system_zone();
5128 ext4_exit_pageio();
ac27a0ec
DK		 5129}
5130
5131MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
83982b6f 5132MODULE_DESCRIPTION("Fourth Extended Filesystem");
ac27a0ec 5133MODULE_LICENSE("GPL");
5dabfc78
TT		 5134module_init(ext4_init_fs)
5135module_exit(ext4_exit_fs)
Linux kernel - Deliverables
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