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ext4: enable mounting bigalloc as read/write
[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
CH		 47#include "ext4.h"
48#include "ext4_jbd2.h"
ac27a0ec
DK		 49#include "xattr.h"
50#include "acl.h"
3661d286 51#include "mballoc.h"
ac27a0ec 52
9bffad1e
TT		 53#define CREATE_TRACE_POINTS
54#include <trace/events/ext4.h>
55
1f109d5a 56static struct proc_dir_entry *ext4_proc_root;
3197ebdb 57static struct kset *ext4_kset;
0b75a840
LC		 58static struct ext4_lazy_init *ext4_li_info;
59static struct mutex ext4_li_mtx;
60static struct ext4_features *ext4_feat;
9f6200bb 61
617ba13b 62static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
ac27a0ec 63 unsigned long journal_devnum);
e2d67052 64static int ext4_commit_super(struct super_block *sb, int sync);
2b2d6d01
TT		 65static void ext4_mark_recovery_complete(struct super_block *sb,
66 struct ext4_super_block *es);
67static void ext4_clear_journal_err(struct super_block *sb,
68 struct ext4_super_block *es);
617ba13b 69static int ext4_sync_fs(struct super_block *sb, int wait);
2b2d6d01 70static const char *ext4_decode_error(struct super_block *sb, int errno,
ac27a0ec 71 char nbuf[16]);
2b2d6d01
TT		 72static int ext4_remount(struct super_block *sb, int *flags, char *data);
73static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
c4be0c1d 74static int ext4_unfreeze(struct super_block *sb);
2b2d6d01 75static void ext4_write_super(struct super_block *sb);
c4be0c1d 76static int ext4_freeze(struct super_block *sb);
152a0836
AV		 77static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
78 const char *dev_name, void *data);
2035e776
TT		 79static inline int ext2_feature_set_ok(struct super_block *sb);
80static inline int ext3_feature_set_ok(struct super_block *sb);
d39195c3 81static int ext4_feature_set_ok(struct super_block *sb, int readonly);
bfff6873
LC		 82static void ext4_destroy_lazyinit_thread(void);
83static void ext4_unregister_li_request(struct super_block *sb);
8f1f7453 84static void ext4_clear_request_list(void);
ac27a0ec 85
2035e776
TT		 86#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
87static struct file_system_type ext2_fs_type = {
88 .owner = THIS_MODULE,
89 .name = "ext2",
90 .mount = ext4_mount,
91 .kill_sb = kill_block_super,
92 .fs_flags = FS_REQUIRES_DEV,
93};
94#define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type)
95#else
96#define IS_EXT2_SB(sb) (0)
97#endif
98
99
ba69f9ab
JK		 100#if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
101static struct file_system_type ext3_fs_type = {
102 .owner = THIS_MODULE,
103 .name = "ext3",
152a0836 104 .mount = ext4_mount,
ba69f9ab
JK		 105 .kill_sb = kill_block_super,
106 .fs_flags = FS_REQUIRES_DEV,
107};
108#define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type)
109#else
110#define IS_EXT3_SB(sb) (0)
111#endif
bd81d8ee 112
9933fc0a
TT		 113void *ext4_kvmalloc(size_t size, gfp_t flags)
114{
115 void *ret;
116
117 ret = kmalloc(size, flags);
118 if (!ret)
119 ret = __vmalloc(size, flags, PAGE_KERNEL);
120 return ret;
121}
122
123void *ext4_kvzalloc(size_t size, gfp_t flags)
124{
125 void *ret;
126
db9481c0 127 ret = kzalloc(size, flags);
9933fc0a
TT		 128 if (!ret)
129 ret = __vmalloc(size, flags | __GFP_ZERO, PAGE_KERNEL);
130 return ret;
131}
132
133void ext4_kvfree(void *ptr)
134{
135 if (is_vmalloc_addr(ptr))
136 vfree(ptr);
137 else
138 kfree(ptr);
139
140}
141
8fadc143
AR		 142ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
143 struct ext4_group_desc *bg)
bd81d8ee 144{
3a14589c 145 return le32_to_cpu(bg->bg_block_bitmap_lo) |
8fadc143 146 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 147 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 148}
149
8fadc143
AR		 150ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
151 struct ext4_group_desc *bg)
bd81d8ee 152{
5272f837 153 return le32_to_cpu(bg->bg_inode_bitmap_lo) |
8fadc143 154 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 155 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 156}
157
8fadc143
AR		 158ext4_fsblk_t ext4_inode_table(struct super_block *sb,
159 struct ext4_group_desc *bg)
bd81d8ee 160{
5272f837 161 return le32_to_cpu(bg->bg_inode_table_lo) |
8fadc143 162 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 163 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
bd81d8ee
LV		 164}
165
560671a0
AK		 166__u32 ext4_free_blks_count(struct super_block *sb,
167 struct ext4_group_desc *bg)
168{
169 return le16_to_cpu(bg->bg_free_blocks_count_lo) |
170 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 171 (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0);
560671a0
AK		 172}
173
174__u32 ext4_free_inodes_count(struct super_block *sb,
175 struct ext4_group_desc *bg)
176{
177 return le16_to_cpu(bg->bg_free_inodes_count_lo) |
178 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 179 (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0);
560671a0
AK		 180}
181
182__u32 ext4_used_dirs_count(struct super_block *sb,
183 struct ext4_group_desc *bg)
184{
185 return le16_to_cpu(bg->bg_used_dirs_count_lo) |
186 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 187 (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0);
560671a0
AK		 188}
189
190__u32 ext4_itable_unused_count(struct super_block *sb,
191 struct ext4_group_desc *bg)
192{
193 return le16_to_cpu(bg->bg_itable_unused_lo) |
194 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 195 (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0);
560671a0
AK		 196}
197
8fadc143
AR		 198void ext4_block_bitmap_set(struct super_block *sb,
199 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 200{
3a14589c 201 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 202 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
203 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 204}
205
8fadc143
AR		 206void ext4_inode_bitmap_set(struct super_block *sb,
207 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 208{
5272f837 209 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 210 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
211 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 212}
213
8fadc143
AR		 214void ext4_inode_table_set(struct super_block *sb,
215 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 216{
5272f837 217 bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 218 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
219 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 220}
221
560671a0
AK		 222void ext4_free_blks_set(struct super_block *sb,
223 struct ext4_group_desc *bg, __u32 count)
224{
225 bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count);
226 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
227 bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16);
228}
229
230void ext4_free_inodes_set(struct super_block *sb,
231 struct ext4_group_desc *bg, __u32 count)
232{
233 bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count);
234 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
235 bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16);
236}
237
238void ext4_used_dirs_set(struct super_block *sb,
239 struct ext4_group_desc *bg, __u32 count)
240{
241 bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count);
242 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
243 bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16);
244}
245
246void ext4_itable_unused_set(struct super_block *sb,
247 struct ext4_group_desc *bg, __u32 count)
248{
249 bg->bg_itable_unused_lo = cpu_to_le16((__u16)count);
250 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
251 bg->bg_itable_unused_hi = cpu_to_le16(count >> 16);
252}
253
d3d1faf6
CW		 254
255/* Just increment the non-pointer handle value */
256static handle_t *ext4_get_nojournal(void)
257{
258 handle_t *handle = current->journal_info;
259 unsigned long ref_cnt = (unsigned long)handle;
260
261 BUG_ON(ref_cnt >= EXT4_NOJOURNAL_MAX_REF_COUNT);
262
263 ref_cnt++;
264 handle = (handle_t *)ref_cnt;
265
266 current->journal_info = handle;
267 return handle;
268}
269
270
271/* Decrement the non-pointer handle value */
272static void ext4_put_nojournal(handle_t *handle)
273{
274 unsigned long ref_cnt = (unsigned long)handle;
275
276 BUG_ON(ref_cnt == 0);
277
278 ref_cnt--;
279 handle = (handle_t *)ref_cnt;
280
281 current->journal_info = handle;
282}
283
ac27a0ec 284/*
dab291af 285 * Wrappers for jbd2_journal_start/end.
ac27a0ec
DK		 286 *
287 * The only special thing we need to do here is to make sure that all
288 * journal_end calls result in the superblock being marked dirty, so
289 * that sync() will call the filesystem's write_super callback if
290 * appropriate.
be4f27d3
YY		 291 *
292 * To avoid j_barrier hold in userspace when a user calls freeze(),
293 * ext4 prevents a new handle from being started by s_frozen, which
294 * is in an upper layer.
ac27a0ec 295 */
617ba13b 296handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks)
ac27a0ec
DK		 297{
298 journal_t *journal;
be4f27d3 299 handle_t *handle;
ac27a0ec 300
12706394 301 trace_ext4_journal_start(sb, nblocks, _RET_IP_);
ac27a0ec
DK		 302 if (sb->s_flags & MS_RDONLY)
303 return ERR_PTR(-EROFS);
304
617ba13b 305 journal = EXT4_SB(sb)->s_journal;
be4f27d3
YY		 306 handle = ext4_journal_current_handle();
307
308 /*
309 * If a handle has been started, it should be allowed to
310 * finish, otherwise deadlock could happen between freeze
311 * and others(e.g. truncate) due to the restart of the
312 * journal handle if the filesystem is forzen and active
313 * handles are not stopped.
314 */
315 if (!handle)
316 vfs_check_frozen(sb, SB_FREEZE_TRANS);
317
318 if (!journal)
319 return ext4_get_nojournal();
320 /*
321 * Special case here: if the journal has aborted behind our
322 * backs (eg. EIO in the commit thread), then we still need to
323 * take the FS itself readonly cleanly.
324 */
325 if (is_journal_aborted(journal)) {
326 ext4_abort(sb, "Detected aborted journal");
327 return ERR_PTR(-EROFS);
ac27a0ec 328 }
be4f27d3 329 return jbd2_journal_start(journal, nblocks);
ac27a0ec
DK		 330}
331
332/*
333 * The only special thing we need to do here is to make sure that all
dab291af 334 * jbd2_journal_stop calls result in the superblock being marked dirty, so
ac27a0ec
DK		 335 * that sync() will call the filesystem's write_super callback if
336 * appropriate.
337 */
c398eda0 338int __ext4_journal_stop(const char *where, unsigned int line, handle_t *handle)
ac27a0ec
DK		 339{
340 struct super_block *sb;
341 int err;
342 int rc;
343
0390131b 344 if (!ext4_handle_valid(handle)) {
d3d1faf6 345 ext4_put_nojournal(handle);
0390131b
FM		 346 return 0;
347 }
ac27a0ec
DK		 348 sb = handle->h_transaction->t_journal->j_private;
349 err = handle->h_err;
dab291af 350 rc = jbd2_journal_stop(handle);
ac27a0ec
DK		 351
352 if (!err)
353 err = rc;
354 if (err)
c398eda0 355 __ext4_std_error(sb, where, line, err);
ac27a0ec
DK		 356 return err;
357}
358
90c7201b
TT		 359void ext4_journal_abort_handle(const char *caller, unsigned int line,
360 const char *err_fn, struct buffer_head *bh,
361 handle_t *handle, int err)
ac27a0ec
DK		 362{
363 char nbuf[16];
617ba13b 364 const char *errstr = ext4_decode_error(NULL, err, nbuf);
ac27a0ec 365
0390131b
FM		 366 BUG_ON(!ext4_handle_valid(handle));
367
ac27a0ec
DK		 368 if (bh)
369 BUFFER_TRACE(bh, "abort");
370
371 if (!handle->h_err)
372 handle->h_err = err;
373
374 if (is_handle_aborted(handle))
375 return;
376
90c7201b
TT		 377 printk(KERN_ERR "%s:%d: aborting transaction: %s in %s\n",
378 caller, line, errstr, err_fn);
ac27a0ec 379
dab291af 380 jbd2_journal_abort_handle(handle);
ac27a0ec
DK		 381}
382
1c13d5c0
TT		 383static void __save_error_info(struct super_block *sb, const char *func,
384 unsigned int line)
385{
386 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
387
388 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
389 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
390 es->s_last_error_time = cpu_to_le32(get_seconds());
391 strncpy(es->s_last_error_func, func, sizeof(es->s_last_error_func));
392 es->s_last_error_line = cpu_to_le32(line);
393 if (!es->s_first_error_time) {
394 es->s_first_error_time = es->s_last_error_time;
395 strncpy(es->s_first_error_func, func,
396 sizeof(es->s_first_error_func));
397 es->s_first_error_line = cpu_to_le32(line);
398 es->s_first_error_ino = es->s_last_error_ino;
399 es->s_first_error_block = es->s_last_error_block;
400 }
66e61a9e
TT		 401 /*
402 * Start the daily error reporting function if it hasn't been
403 * started already
404 */
405 if (!es->s_error_count)
406 mod_timer(&EXT4_SB(sb)->s_err_report, jiffies + 24*60*60*HZ);
1c13d5c0
TT		 407 es->s_error_count = cpu_to_le32(le32_to_cpu(es->s_error_count) + 1);
408}
409
410static void save_error_info(struct super_block *sb, const char *func,
411 unsigned int line)
412{
413 __save_error_info(sb, func, line);
414 ext4_commit_super(sb, 1);
415}
416
7c2e7087
TT		 417/*
418 * The del_gendisk() function uninitializes the disk-specific data
419 * structures, including the bdi structure, without telling anyone
420 * else. Once this happens, any attempt to call mark_buffer_dirty()
421 * (for example, by ext4_commit_super), will cause a kernel OOPS.
422 * This is a kludge to prevent these oops until we can put in a proper
423 * hook in del_gendisk() to inform the VFS and file system layers.
424 */
425static int block_device_ejected(struct super_block *sb)
426{
427 struct inode *bd_inode = sb->s_bdev->bd_inode;
428 struct backing_dev_info *bdi = bd_inode->i_mapping->backing_dev_info;
429
430 return bdi->dev == NULL;
431}
432
1c13d5c0 433
ac27a0ec
DK		 434/* Deal with the reporting of failure conditions on a filesystem such as
435 * inconsistencies detected or read IO failures.
436 *
437 * On ext2, we can store the error state of the filesystem in the
617ba13b 438 * superblock. That is not possible on ext4, because we may have other
ac27a0ec
DK		 439 * write ordering constraints on the superblock which prevent us from
440 * writing it out straight away; and given that the journal is about to
441 * be aborted, we can't rely on the current, or future, transactions to
442 * write out the superblock safely.
443 *
dab291af 444 * We'll just use the jbd2_journal_abort() error code to record an error in
d6b198bc 445 * the journal instead. On recovery, the journal will complain about
ac27a0ec
DK		 446 * that error until we've noted it down and cleared it.
447 */
448
617ba13b 449static void ext4_handle_error(struct super_block *sb)
ac27a0ec 450{
ac27a0ec
DK		 451 if (sb->s_flags & MS_RDONLY)
452 return;
453
2b2d6d01 454 if (!test_opt(sb, ERRORS_CONT)) {
617ba13b 455 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 456
4ab2f15b 457 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
ac27a0ec 458 if (journal)
dab291af 459 jbd2_journal_abort(journal, -EIO);
ac27a0ec 460 }
2b2d6d01 461 if (test_opt(sb, ERRORS_RO)) {
b31e1552 462 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
ac27a0ec
DK		 463 sb->s_flags |= MS_RDONLY;
464 }
ac27a0ec 465 if (test_opt(sb, ERRORS_PANIC))
617ba13b 466 panic("EXT4-fs (device %s): panic forced after error\n",
ac27a0ec
DK		 467 sb->s_id);
468}
469
12062ddd 470void __ext4_error(struct super_block *sb, const char *function,
c398eda0 471 unsigned int line, const char *fmt, ...)
ac27a0ec 472{
0ff2ea7d 473 struct va_format vaf;
ac27a0ec
DK		 474 va_list args;
475
476 va_start(args, fmt);
0ff2ea7d
JP		 477 vaf.fmt = fmt;
478 vaf.va = &args;
479 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n",
480 sb->s_id, function, line, current->comm, &vaf);
ac27a0ec
DK		 481 va_end(args);
482
617ba13b 483 ext4_handle_error(sb);
ac27a0ec
DK		 484}
485
c398eda0
TT		 486void ext4_error_inode(struct inode *inode, const char *function,
487 unsigned int line, ext4_fsblk_t block,
273df556
FM		 488 const char *fmt, ...)
489{
490 va_list args;
f7c21177 491 struct va_format vaf;
1c13d5c0 492 struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
273df556 493
1c13d5c0
TT		 494 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
495 es->s_last_error_block = cpu_to_le64(block);
496 save_error_info(inode->i_sb, function, line);
273df556 497 va_start(args, fmt);
f7c21177
TT		 498 vaf.fmt = fmt;
499 vaf.va = &args;
c398eda0
TT		 500 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: inode #%lu: ",
501 inode->i_sb->s_id, function, line, inode->i_ino);
502 if (block)
f7c21177
TT		 503 printk(KERN_CONT "block %llu: ", block);
504 printk(KERN_CONT "comm %s: %pV\n", current->comm, &vaf);
273df556
FM		 505 va_end(args);
506
507 ext4_handle_error(inode->i_sb);
508}
509
c398eda0 510void ext4_error_file(struct file *file, const char *function,
f7c21177
TT		 511 unsigned int line, ext4_fsblk_t block,
512 const char *fmt, ...)
273df556
FM		 513{
514 va_list args;
f7c21177 515 struct va_format vaf;
1c13d5c0 516 struct ext4_super_block *es;
273df556
FM		 517 struct inode *inode = file->f_dentry->d_inode;
518 char pathname[80], *path;
519
1c13d5c0
TT		 520 es = EXT4_SB(inode->i_sb)->s_es;
521 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
522 save_error_info(inode->i_sb, function, line);
273df556 523 path = d_path(&(file->f_path), pathname, sizeof(pathname));
f9a62d09 524 if (IS_ERR(path))
273df556
FM		 525 path = "(unknown)";
526 printk(KERN_CRIT
f7c21177
TT		 527 "EXT4-fs error (device %s): %s:%d: inode #%lu: ",
528 inode->i_sb->s_id, function, line, inode->i_ino);
529 if (block)
530 printk(KERN_CONT "block %llu: ", block);
531 va_start(args, fmt);
532 vaf.fmt = fmt;
533 vaf.va = &args;
534 printk(KERN_CONT "comm %s: path %s: %pV\n", current->comm, path, &vaf);
273df556
FM		 535 va_end(args);
536
537 ext4_handle_error(inode->i_sb);
538}
539
2b2d6d01 540static const char *ext4_decode_error(struct super_block *sb, int errno,
ac27a0ec
DK		 541 char nbuf[16])
542{
543 char *errstr = NULL;
544
545 switch (errno) {
546 case -EIO:
547 errstr = "IO failure";
548 break;
549 case -ENOMEM:
550 errstr = "Out of memory";
551 break;
552 case -EROFS:
78f1ddbb
TT		 553 if (!sb || (EXT4_SB(sb)->s_journal &&
554 EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT))
ac27a0ec
DK		 555 errstr = "Journal has aborted";
556 else
557 errstr = "Readonly filesystem";
558 break;
559 default:
560 /* If the caller passed in an extra buffer for unknown
561 * errors, textualise them now. Else we just return
562 * NULL. */
563 if (nbuf) {
564 /* Check for truncated error codes... */
565 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
566 errstr = nbuf;
567 }
568 break;
569 }
570
571 return errstr;
572}
573
617ba13b 574/* __ext4_std_error decodes expected errors from journaling functions
ac27a0ec
DK		 575 * automatically and invokes the appropriate error response. */
576
c398eda0
TT		 577void __ext4_std_error(struct super_block *sb, const char *function,
578 unsigned int line, int errno)
ac27a0ec
DK		 579{
580 char nbuf[16];
581 const char *errstr;
582
583 /* Special case: if the error is EROFS, and we're not already
584 * inside a transaction, then there's really no point in logging
585 * an error. */
586 if (errno == -EROFS && journal_current_handle() == NULL &&
587 (sb->s_flags & MS_RDONLY))
588 return;
589
617ba13b 590 errstr = ext4_decode_error(sb, errno, nbuf);
c398eda0
TT		 591 printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n",
592 sb->s_id, function, line, errstr);
1c13d5c0 593 save_error_info(sb, function, line);
ac27a0ec 594
617ba13b 595 ext4_handle_error(sb);
ac27a0ec
DK		 596}
597
598/*
617ba13b 599 * ext4_abort is a much stronger failure handler than ext4_error. The
ac27a0ec
DK		 600 * abort function may be used to deal with unrecoverable failures such
601 * as journal IO errors or ENOMEM at a critical moment in log management.
602 *
603 * We unconditionally force the filesystem into an ABORT|READONLY state,
604 * unless the error response on the fs has been set to panic in which
605 * case we take the easy way out and panic immediately.
606 */
607
c67d859e 608void __ext4_abort(struct super_block *sb, const char *function,
c398eda0 609 unsigned int line, const char *fmt, ...)
ac27a0ec
DK		 610{
611 va_list args;
612
1c13d5c0 613 save_error_info(sb, function, line);
ac27a0ec 614 va_start(args, fmt);
c398eda0
TT		 615 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: ", sb->s_id,
616 function, line);
ac27a0ec
DK		 617 vprintk(fmt, args);
618 printk("\n");
619 va_end(args);
620
1c13d5c0
TT		 621 if ((sb->s_flags & MS_RDONLY) == 0) {
622 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
623 sb->s_flags |= MS_RDONLY;
624 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
625 if (EXT4_SB(sb)->s_journal)
626 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
627 save_error_info(sb, function, line);
628 }
ac27a0ec 629 if (test_opt(sb, ERRORS_PANIC))
617ba13b 630 panic("EXT4-fs panic from previous error\n");
ac27a0ec
DK		 631}
632
0ff2ea7d 633void ext4_msg(struct super_block *sb, const char *prefix, const char *fmt, ...)
b31e1552 634{
0ff2ea7d 635 struct va_format vaf;
b31e1552
ES		 636 va_list args;
637
638 va_start(args, fmt);
0ff2ea7d
JP		 639 vaf.fmt = fmt;
640 vaf.va = &args;
641 printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
b31e1552
ES		 642 va_end(args);
643}
644
12062ddd 645void __ext4_warning(struct super_block *sb, const char *function,
c398eda0 646 unsigned int line, const char *fmt, ...)
ac27a0ec 647{
0ff2ea7d 648 struct va_format vaf;
ac27a0ec
DK		 649 va_list args;
650
651 va_start(args, fmt);
0ff2ea7d
JP		 652 vaf.fmt = fmt;
653 vaf.va = &args;
654 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: %pV\n",
655 sb->s_id, function, line, &vaf);
ac27a0ec
DK		 656 va_end(args);
657}
658
e29136f8
TT		 659void __ext4_grp_locked_error(const char *function, unsigned int line,
660 struct super_block *sb, ext4_group_t grp,
661 unsigned long ino, ext4_fsblk_t block,
662 const char *fmt, ...)
5d1b1b3f
AK		 663__releases(bitlock)
664__acquires(bitlock)
665{
0ff2ea7d 666 struct va_format vaf;
5d1b1b3f
AK		 667 va_list args;
668 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
669
1c13d5c0
TT		 670 es->s_last_error_ino = cpu_to_le32(ino);
671 es->s_last_error_block = cpu_to_le64(block);
672 __save_error_info(sb, function, line);
0ff2ea7d 673
5d1b1b3f 674 va_start(args, fmt);
0ff2ea7d
JP		 675
676 vaf.fmt = fmt;
677 vaf.va = &args;
21149d61 678 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u, ",
e29136f8
TT		 679 sb->s_id, function, line, grp);
680 if (ino)
0ff2ea7d 681 printk(KERN_CONT "inode %lu: ", ino);
e29136f8 682 if (block)
0ff2ea7d
JP		 683 printk(KERN_CONT "block %llu:", (unsigned long long) block);
684 printk(KERN_CONT "%pV\n", &vaf);
5d1b1b3f
AK		 685 va_end(args);
686
687 if (test_opt(sb, ERRORS_CONT)) {
e2d67052 688 ext4_commit_super(sb, 0);
5d1b1b3f
AK		 689 return;
690 }
1c13d5c0 691
5d1b1b3f
AK		 692 ext4_unlock_group(sb, grp);
693 ext4_handle_error(sb);
694 /*
695 * We only get here in the ERRORS_RO case; relocking the group
696 * may be dangerous, but nothing bad will happen since the
697 * filesystem will have already been marked read/only and the
698 * journal has been aborted. We return 1 as a hint to callers
699 * who might what to use the return value from
25985edc 700 * ext4_grp_locked_error() to distinguish between the
5d1b1b3f
AK		 701 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
702 * aggressively from the ext4 function in question, with a
703 * more appropriate error code.
704 */
705 ext4_lock_group(sb, grp);
706 return;
707}
708
617ba13b 709void ext4_update_dynamic_rev(struct super_block *sb)
ac27a0ec 710{
617ba13b 711 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
ac27a0ec 712
617ba13b 713 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
ac27a0ec
DK		 714 return;
715
12062ddd 716 ext4_warning(sb,
ac27a0ec
DK		 717 "updating to rev %d because of new feature flag, "
718 "running e2fsck is recommended",
617ba13b 719 EXT4_DYNAMIC_REV);
ac27a0ec 720
617ba13b
MC		 721 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
722 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
723 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
ac27a0ec
DK		 724 /* leave es->s_feature_*compat flags alone */
725 /* es->s_uuid will be set by e2fsck if empty */
726
727 /*
728 * The rest of the superblock fields should be zero, and if not it
729 * means they are likely already in use, so leave them alone. We
730 * can leave it up to e2fsck to clean up any inconsistencies there.
731 */
732}
733
734/*
735 * Open the external journal device
736 */
b31e1552 737static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb)
ac27a0ec
DK		 738{
739 struct block_device *bdev;
740 char b[BDEVNAME_SIZE];
741
d4d77629 742 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
ac27a0ec
DK		 743 if (IS_ERR(bdev))
744 goto fail;
745 return bdev;
746
747fail:
b31e1552 748 ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld",
ac27a0ec
DK		 749 __bdevname(dev, b), PTR_ERR(bdev));
750 return NULL;
751}
752
753/*
754 * Release the journal device
755 */
617ba13b 756static int ext4_blkdev_put(struct block_device *bdev)
ac27a0ec 757{
e525fd89 758 return blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
ac27a0ec
DK		 759}
760
617ba13b 761static int ext4_blkdev_remove(struct ext4_sb_info *sbi)
ac27a0ec
DK		 762{
763 struct block_device *bdev;
764 int ret = -ENODEV;
765
766 bdev = sbi->journal_bdev;
767 if (bdev) {
617ba13b 768 ret = ext4_blkdev_put(bdev);
ac27a0ec
DK		 769 sbi->journal_bdev = NULL;
770 }
771 return ret;
772}
773
774static inline struct inode *orphan_list_entry(struct list_head *l)
775{
617ba13b 776 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
ac27a0ec
DK		 777}
778
617ba13b 779static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
ac27a0ec
DK		 780{
781 struct list_head *l;
782
b31e1552
ES		 783 ext4_msg(sb, KERN_ERR, "sb orphan head is %d",
784 le32_to_cpu(sbi->s_es->s_last_orphan));
ac27a0ec
DK		 785
786 printk(KERN_ERR "sb_info orphan list:\n");
787 list_for_each(l, &sbi->s_orphan) {
788 struct inode *inode = orphan_list_entry(l);
789 printk(KERN_ERR " "
790 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
791 inode->i_sb->s_id, inode->i_ino, inode,
792 inode->i_mode, inode->i_nlink,
793 NEXT_ORPHAN(inode));
794 }
795}
796
2b2d6d01 797static void ext4_put_super(struct super_block *sb)
ac27a0ec 798{
617ba13b
MC		 799 struct ext4_sb_info *sbi = EXT4_SB(sb);
800 struct ext4_super_block *es = sbi->s_es;
ef2cabf7 801 int i, err;
ac27a0ec 802
857ac889 803 ext4_unregister_li_request(sb);
e0ccfd95
CH		 804 dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
805
4c0425ff
MC		 806 flush_workqueue(sbi->dio_unwritten_wq);
807 destroy_workqueue(sbi->dio_unwritten_wq);
808
a9e220f8 809 lock_super(sb);
8c85e125 810 if (sb->s_dirt)
ebc1ac16 811 ext4_commit_super(sb, 1);
8c85e125 812
0390131b
FM		 813 if (sbi->s_journal) {
814 err = jbd2_journal_destroy(sbi->s_journal);
815 sbi->s_journal = NULL;
816 if (err < 0)
c67d859e 817 ext4_abort(sb, "Couldn't clean up the journal");
0390131b 818 }
d4edac31 819
a1c6c569 820 del_timer(&sbi->s_err_report);
d4edac31
JB		 821 ext4_release_system_zone(sb);
822 ext4_mb_release(sb);
823 ext4_ext_release(sb);
824 ext4_xattr_put_super(sb);
825
ac27a0ec 826 if (!(sb->s_flags & MS_RDONLY)) {
617ba13b 827 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
ac27a0ec 828 es->s_state = cpu_to_le16(sbi->s_mount_state);
e2d67052 829 ext4_commit_super(sb, 1);
ac27a0ec 830 }
240799cd 831 if (sbi->s_proc) {
9f6200bb 832 remove_proc_entry(sb->s_id, ext4_proc_root);
240799cd 833 }
3197ebdb 834 kobject_del(&sbi->s_kobj);
ac27a0ec
DK		 835
836 for (i = 0; i < sbi->s_gdb_count; i++)
837 brelse(sbi->s_group_desc[i]);
f18a5f21 838 ext4_kvfree(sbi->s_group_desc);
9933fc0a 839 ext4_kvfree(sbi->s_flex_groups);
57042651 840 percpu_counter_destroy(&sbi->s_freeclusters_counter);
ac27a0ec
DK		 841 percpu_counter_destroy(&sbi->s_freeinodes_counter);
842 percpu_counter_destroy(&sbi->s_dirs_counter);
57042651 843 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
ac27a0ec
DK		 844 brelse(sbi->s_sbh);
845#ifdef CONFIG_QUOTA
846 for (i = 0; i < MAXQUOTAS; i++)
847 kfree(sbi->s_qf_names[i]);
848#endif
849
850 /* Debugging code just in case the in-memory inode orphan list
851 * isn't empty. The on-disk one can be non-empty if we've
852 * detected an error and taken the fs readonly, but the
853 * in-memory list had better be clean by this point. */
854 if (!list_empty(&sbi->s_orphan))
855 dump_orphan_list(sb, sbi);
856 J_ASSERT(list_empty(&sbi->s_orphan));
857
f98393a6 858 invalidate_bdev(sb->s_bdev);
ac27a0ec
DK		 859 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
860 /*
861 * Invalidate the journal device's buffers. We don't want them
862 * floating about in memory - the physical journal device may
863 * hotswapped, and it breaks the `ro-after' testing code.
864 */
865 sync_blockdev(sbi->journal_bdev);
f98393a6 866 invalidate_bdev(sbi->journal_bdev);
617ba13b 867 ext4_blkdev_remove(sbi);
ac27a0ec 868 }
c5e06d10
JL		 869 if (sbi->s_mmp_tsk)
870 kthread_stop(sbi->s_mmp_tsk);
ac27a0ec 871 sb->s_fs_info = NULL;
3197ebdb
TT		 872 /*
873 * Now that we are completely done shutting down the
874 * superblock, we need to actually destroy the kobject.
875 */
3197ebdb
TT		 876 unlock_super(sb);
877 kobject_put(&sbi->s_kobj);
878 wait_for_completion(&sbi->s_kobj_unregister);
705895b6 879 kfree(sbi->s_blockgroup_lock);
ac27a0ec 880 kfree(sbi);
ac27a0ec
DK		 881}
882
e18b890b 883static struct kmem_cache *ext4_inode_cachep;
ac27a0ec
DK		 884
885/*
886 * Called inside transaction, so use GFP_NOFS
887 */
617ba13b 888static struct inode *ext4_alloc_inode(struct super_block *sb)
ac27a0ec 889{
617ba13b 890 struct ext4_inode_info *ei;
ac27a0ec 891
e6b4f8da 892 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
ac27a0ec
DK		 893 if (!ei)
894 return NULL;
0b8e58a1 895
ac27a0ec 896 ei->vfs_inode.i_version = 1;
91246c00 897 ei->vfs_inode.i_data.writeback_index = 0;
a86c6181 898 memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache));
c9de560d
AT		 899 INIT_LIST_HEAD(&ei->i_prealloc_list);
900 spin_lock_init(&ei->i_prealloc_lock);
d2a17637
MC		 901 ei->i_reserved_data_blocks = 0;
902 ei->i_reserved_meta_blocks = 0;
903 ei->i_allocated_meta_blocks = 0;
9d0be502 904 ei->i_da_metadata_calc_len = 0;
d2a17637 905 spin_lock_init(&(ei->i_block_reservation_lock));
a9e7f447
DM		 906#ifdef CONFIG_QUOTA
907 ei->i_reserved_quota = 0;
908#endif
8aefcd55 909 ei->jinode = NULL;
c7064ef1 910 INIT_LIST_HEAD(&ei->i_completed_io_list);
744692dc 911 spin_lock_init(&ei->i_completed_io_lock);
8d5d02e6 912 ei->cur_aio_dio = NULL;
b436b9be
JK		 913 ei->i_sync_tid = 0;
914 ei->i_datasync_tid = 0;
f7ad6d2e 915 atomic_set(&ei->i_ioend_count, 0);
e9e3bcec 916 atomic_set(&ei->i_aiodio_unwritten, 0);
0b8e58a1 917
ac27a0ec
DK		 918 return &ei->vfs_inode;
919}
920
7ff9c073
TT		 921static int ext4_drop_inode(struct inode *inode)
922{
923 int drop = generic_drop_inode(inode);
924
925 trace_ext4_drop_inode(inode, drop);
926 return drop;
927}
928
fa0d7e3d
NP		 929static void ext4_i_callback(struct rcu_head *head)
930{
931 struct inode *inode = container_of(head, struct inode, i_rcu);
932 INIT_LIST_HEAD(&inode->i_dentry);
933 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
934}
935
617ba13b 936static void ext4_destroy_inode(struct inode *inode)
ac27a0ec 937{
9f7dd93d 938 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
b31e1552
ES		 939 ext4_msg(inode->i_sb, KERN_ERR,
940 "Inode %lu (%p): orphan list check failed!",
941 inode->i_ino, EXT4_I(inode));
9f7dd93d
VA		 942 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
943 EXT4_I(inode), sizeof(struct ext4_inode_info),
944 true);
945 dump_stack();
946 }
fa0d7e3d 947 call_rcu(&inode->i_rcu, ext4_i_callback);
ac27a0ec
DK		 948}
949
51cc5068 950static void init_once(void *foo)
ac27a0ec 951{
617ba13b 952 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
ac27a0ec 953
a35afb83 954 INIT_LIST_HEAD(&ei->i_orphan);
03010a33 955#ifdef CONFIG_EXT4_FS_XATTR
a35afb83 956 init_rwsem(&ei->xattr_sem);
ac27a0ec 957#endif
0e855ac8 958 init_rwsem(&ei->i_data_sem);
a35afb83 959 inode_init_once(&ei->vfs_inode);
ac27a0ec
DK		 960}
961
962static int init_inodecache(void)
963{
617ba13b
MC		 964 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
965 sizeof(struct ext4_inode_info),
ac27a0ec
DK		 966 0, (SLAB_RECLAIM_ACCOUNT|
967 SLAB_MEM_SPREAD),
20c2df83 968 init_once);
617ba13b 969 if (ext4_inode_cachep == NULL)
ac27a0ec
DK		 970 return -ENOMEM;
971 return 0;
972}
973
974static void destroy_inodecache(void)
975{
617ba13b 976 kmem_cache_destroy(ext4_inode_cachep);
ac27a0ec
DK		 977}
978
0930fcc1 979void ext4_clear_inode(struct inode *inode)
ac27a0ec 980{
0930fcc1
AV		 981 invalidate_inode_buffers(inode);
982 end_writeback(inode);
9f754758 983 dquot_drop(inode);
c2ea3fde 984 ext4_discard_preallocations(inode);
8aefcd55
TT		 985 if (EXT4_I(inode)->jinode) {
986 jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode),
987 EXT4_I(inode)->jinode);
988 jbd2_free_inode(EXT4_I(inode)->jinode);
989 EXT4_I(inode)->jinode = NULL;
990 }
ac27a0ec
DK		 991}
992
2b2d6d01
TT		 993static inline void ext4_show_quota_options(struct seq_file *seq,
994 struct super_block *sb)
ac27a0ec
DK		 995{
996#if defined(CONFIG_QUOTA)
617ba13b 997 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 998
5a20bdfc
JK		 999 if (sbi->s_jquota_fmt) {
1000 char *fmtname = "";
1001
1002 switch (sbi->s_jquota_fmt) {
1003 case QFMT_VFS_OLD:
1004 fmtname = "vfsold";
1005 break;
1006 case QFMT_VFS_V0:
1007 fmtname = "vfsv0";
1008 break;
1009 case QFMT_VFS_V1:
1010 fmtname = "vfsv1";
1011 break;
1012 }
1013 seq_printf(seq, ",jqfmt=%s", fmtname);
1014 }
ac27a0ec
DK		 1015
1016 if (sbi->s_qf_names[USRQUOTA])
1017 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
1018
1019 if (sbi->s_qf_names[GRPQUOTA])
1020 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
1021
482a7425 1022 if (test_opt(sb, USRQUOTA))
ac27a0ec
DK		 1023 seq_puts(seq, ",usrquota");
1024
482a7425 1025 if (test_opt(sb, GRPQUOTA))
ac27a0ec
DK		 1026 seq_puts(seq, ",grpquota");
1027#endif
1028}
1029
d9c9bef1
MS		 1030/*
1031 * Show an option if
1032 * - it's set to a non-default value OR
1033 * - if the per-sb default is different from the global default
1034 */
617ba13b 1035static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs)
ac27a0ec 1036{
aa22df2c
AK		 1037 int def_errors;
1038 unsigned long def_mount_opts;
ac27a0ec 1039 struct super_block *sb = vfs->mnt_sb;
d9c9bef1
MS		 1040 struct ext4_sb_info *sbi = EXT4_SB(sb);
1041 struct ext4_super_block *es = sbi->s_es;
d9c9bef1
MS		 1042
1043 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
aa22df2c 1044 def_errors = le16_to_cpu(es->s_errors);
d9c9bef1
MS		 1045
1046 if (sbi->s_sb_block != 1)
1047 seq_printf(seq, ",sb=%llu", sbi->s_sb_block);
1048 if (test_opt(sb, MINIX_DF))
1049 seq_puts(seq, ",minixdf");
aa22df2c 1050 if (test_opt(sb, GRPID) && !(def_mount_opts & EXT4_DEFM_BSDGROUPS))
d9c9bef1
MS		 1051 seq_puts(seq, ",grpid");
1052 if (!test_opt(sb, GRPID) && (def_mount_opts & EXT4_DEFM_BSDGROUPS))
1053 seq_puts(seq, ",nogrpid");
1054 if (sbi->s_resuid != EXT4_DEF_RESUID ||
1055 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID) {
1056 seq_printf(seq, ",resuid=%u", sbi->s_resuid);
1057 }
1058 if (sbi->s_resgid != EXT4_DEF_RESGID ||
1059 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID) {
1060 seq_printf(seq, ",resgid=%u", sbi->s_resgid);
1061 }
bb4f397a 1062 if (test_opt(sb, ERRORS_RO)) {
d9c9bef1 1063 if (def_errors == EXT4_ERRORS_PANIC ||
bb4f397a
AK		 1064 def_errors == EXT4_ERRORS_CONTINUE) {
1065 seq_puts(seq, ",errors=remount-ro");
d9c9bef1
MS		 1066 }
1067 }
aa22df2c 1068 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
bb4f397a 1069 seq_puts(seq, ",errors=continue");
aa22df2c 1070 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
d9c9bef1 1071 seq_puts(seq, ",errors=panic");
aa22df2c 1072 if (test_opt(sb, NO_UID32) && !(def_mount_opts & EXT4_DEFM_UID16))
d9c9bef1 1073 seq_puts(seq, ",nouid32");
aa22df2c 1074 if (test_opt(sb, DEBUG) && !(def_mount_opts & EXT4_DEFM_DEBUG))
d9c9bef1
MS		 1075 seq_puts(seq, ",debug");
1076 if (test_opt(sb, OLDALLOC))
1077 seq_puts(seq, ",oldalloc");
03010a33 1078#ifdef CONFIG_EXT4_FS_XATTR
ea663336 1079 if (test_opt(sb, XATTR_USER))
d9c9bef1 1080 seq_puts(seq, ",user_xattr");
ea663336 1081 if (!test_opt(sb, XATTR_USER))
d9c9bef1 1082 seq_puts(seq, ",nouser_xattr");
d9c9bef1 1083#endif
03010a33 1084#ifdef CONFIG_EXT4_FS_POSIX_ACL
aa22df2c 1085 if (test_opt(sb, POSIX_ACL) && !(def_mount_opts & EXT4_DEFM_ACL))
d9c9bef1
MS		 1086 seq_puts(seq, ",acl");
1087 if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT4_DEFM_ACL))
1088 seq_puts(seq, ",noacl");
1089#endif
30773840 1090 if (sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) {
d9c9bef1
MS		 1091 seq_printf(seq, ",commit=%u",
1092 (unsigned) (sbi->s_commit_interval / HZ));
1093 }
30773840
TT		 1094 if (sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME) {
1095 seq_printf(seq, ",min_batch_time=%u",
1096 (unsigned) sbi->s_min_batch_time);
1097 }
1098 if (sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME) {
1099 seq_printf(seq, ",max_batch_time=%u",
1100 (unsigned) sbi->s_min_batch_time);
1101 }
1102
571640ca
ES		 1103 /*
1104 * We're changing the default of barrier mount option, so
1105 * let's always display its mount state so it's clear what its
1106 * status is.
1107 */
1108 seq_puts(seq, ",barrier=");
1109 seq_puts(seq, test_opt(sb, BARRIER) ? "1" : "0");
cd0b6a39
TT		 1110 if (test_opt(sb, JOURNAL_ASYNC_COMMIT))
1111 seq_puts(seq, ",journal_async_commit");
39a4bade
JK		 1112 else if (test_opt(sb, JOURNAL_CHECKSUM))
1113 seq_puts(seq, ",journal_checksum");
25ec56b5
JNC		 1114 if (test_opt(sb, I_VERSION))
1115 seq_puts(seq, ",i_version");
8b67f04a
TT		 1116 if (!test_opt(sb, DELALLOC) &&
1117 !(def_mount_opts & EXT4_DEFM_NODELALLOC))
dd919b98
AK		 1118 seq_puts(seq, ",nodelalloc");
1119
6fd7a467
TT		 1120 if (!test_opt(sb, MBLK_IO_SUBMIT))
1121 seq_puts(seq, ",nomblk_io_submit");
cb45bbe4
MS		 1122 if (sbi->s_stripe)
1123 seq_printf(seq, ",stripe=%lu", sbi->s_stripe);
aa22df2c
AK		 1124 /*
1125 * journal mode get enabled in different ways
1126 * So just print the value even if we didn't specify it
1127 */
617ba13b 1128 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
ac27a0ec 1129 seq_puts(seq, ",data=journal");
617ba13b 1130 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
ac27a0ec 1131 seq_puts(seq, ",data=ordered");
617ba13b 1132 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
ac27a0ec
DK		 1133 seq_puts(seq, ",data=writeback");
1134
240799cd
TT		 1135 if (sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
1136 seq_printf(seq, ",inode_readahead_blks=%u",
1137 sbi->s_inode_readahead_blks);
1138
5bf5683a
HK		 1139 if (test_opt(sb, DATA_ERR_ABORT))
1140 seq_puts(seq, ",data_err=abort");
1141
afd4672d 1142 if (test_opt(sb, NO_AUTO_DA_ALLOC))
06705bff 1143 seq_puts(seq, ",noauto_da_alloc");
afd4672d 1144
8b67f04a 1145 if (test_opt(sb, DISCARD) && !(def_mount_opts & EXT4_DEFM_DISCARD))
5328e635
ES		 1146 seq_puts(seq, ",discard");
1147
e3bb52ae
ES		 1148 if (test_opt(sb, NOLOAD))
1149 seq_puts(seq, ",norecovery");
1150
744692dc
JZ		 1151 if (test_opt(sb, DIOREAD_NOLOCK))
1152 seq_puts(seq, ",dioread_nolock");
1153
8b67f04a
TT		 1154 if (test_opt(sb, BLOCK_VALIDITY) &&
1155 !(def_mount_opts & EXT4_DEFM_BLOCK_VALIDITY))
1156 seq_puts(seq, ",block_validity");
1157
bfff6873
LC		 1158 if (!test_opt(sb, INIT_INODE_TABLE))
1159 seq_puts(seq, ",noinit_inode_table");
51ce6511 1160 else if (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT)
bfff6873
LC		 1161 seq_printf(seq, ",init_inode_table=%u",
1162 (unsigned) sbi->s_li_wait_mult);
1163
617ba13b 1164 ext4_show_quota_options(seq, sb);
0b8e58a1 1165
ac27a0ec
DK		 1166 return 0;
1167}
1168
1b961ac0 1169static struct inode *ext4_nfs_get_inode(struct super_block *sb,
0b8e58a1 1170 u64 ino, u32 generation)
ac27a0ec 1171{
ac27a0ec 1172 struct inode *inode;
ac27a0ec 1173
617ba13b 1174 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
ac27a0ec 1175 return ERR_PTR(-ESTALE);
617ba13b 1176 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
ac27a0ec
DK		 1177 return ERR_PTR(-ESTALE);
1178
1179 /* iget isn't really right if the inode is currently unallocated!!
1180 *
617ba13b 1181 * ext4_read_inode will return a bad_inode if the inode had been
ac27a0ec
DK		 1182 * deleted, so we should be safe.
1183 *
1184 * Currently we don't know the generation for parent directory, so
1185 * a generation of 0 means "accept any"
1186 */
1d1fe1ee
DH		 1187 inode = ext4_iget(sb, ino);
1188 if (IS_ERR(inode))
1189 return ERR_CAST(inode);
1190 if (generation && inode->i_generation != generation) {
ac27a0ec
DK		 1191 iput(inode);
1192 return ERR_PTR(-ESTALE);
1193 }
1b961ac0
CH		 1194
1195 return inode;
1196}
1197
1198static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
0b8e58a1 1199 int fh_len, int fh_type)
1b961ac0
CH		 1200{
1201 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
1202 ext4_nfs_get_inode);
1203}
1204
1205static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
0b8e58a1 1206 int fh_len, int fh_type)
1b961ac0
CH		 1207{
1208 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
1209 ext4_nfs_get_inode);
ac27a0ec
DK		 1210}
1211
c39a7f84
TO		 1212/*
1213 * Try to release metadata pages (indirect blocks, directories) which are
1214 * mapped via the block device. Since these pages could have journal heads
1215 * which would prevent try_to_free_buffers() from freeing them, we must use
1216 * jbd2 layer's try_to_free_buffers() function to release them.
1217 */
0b8e58a1
AD		 1218static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
1219 gfp_t wait)
c39a7f84
TO		 1220{
1221 journal_t *journal = EXT4_SB(sb)->s_journal;
1222
1223 WARN_ON(PageChecked(page));
1224 if (!page_has_buffers(page))
1225 return 0;
1226 if (journal)
1227 return jbd2_journal_try_to_free_buffers(journal, page,
1228 wait & ~__GFP_WAIT);
1229 return try_to_free_buffers(page);
1230}
1231
ac27a0ec 1232#ifdef CONFIG_QUOTA
af5bc92d 1233#define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
2b2d6d01 1234#define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
ac27a0ec 1235
617ba13b
MC		 1236static int ext4_write_dquot(struct dquot *dquot);
1237static int ext4_acquire_dquot(struct dquot *dquot);
1238static int ext4_release_dquot(struct dquot *dquot);
1239static int ext4_mark_dquot_dirty(struct dquot *dquot);
1240static int ext4_write_info(struct super_block *sb, int type);
6f28e087 1241static int ext4_quota_on(struct super_block *sb, int type, int format_id,
f00c9e44 1242 struct path *path);
ca0e05e4 1243static int ext4_quota_off(struct super_block *sb, int type);
617ba13b
MC		 1244static int ext4_quota_on_mount(struct super_block *sb, int type);
1245static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec 1246 size_t len, loff_t off);
617ba13b 1247static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec
DK		 1248 const char *data, size_t len, loff_t off);
1249
61e225dc 1250static const struct dquot_operations ext4_quota_operations = {
60e58e0f 1251 .get_reserved_space = ext4_get_reserved_space,
617ba13b
MC		 1252 .write_dquot = ext4_write_dquot,
1253 .acquire_dquot = ext4_acquire_dquot,
1254 .release_dquot = ext4_release_dquot,
1255 .mark_dirty = ext4_mark_dquot_dirty,
a5b5ee32
JK		 1256 .write_info = ext4_write_info,
1257 .alloc_dquot = dquot_alloc,
1258 .destroy_dquot = dquot_destroy,
ac27a0ec
DK		 1259};
1260
0d54b217 1261static const struct quotactl_ops ext4_qctl_operations = {
617ba13b 1262 .quota_on = ext4_quota_on,
ca0e05e4 1263 .quota_off = ext4_quota_off,
287a8095
CH		 1264 .quota_sync = dquot_quota_sync,
1265 .get_info = dquot_get_dqinfo,
1266 .set_info = dquot_set_dqinfo,
1267 .get_dqblk = dquot_get_dqblk,
1268 .set_dqblk = dquot_set_dqblk
ac27a0ec
DK		 1269};
1270#endif
1271
ee9b6d61 1272static const struct super_operations ext4_sops = {
617ba13b
MC		 1273 .alloc_inode = ext4_alloc_inode,
1274 .destroy_inode = ext4_destroy_inode,
617ba13b
MC		 1275 .write_inode = ext4_write_inode,
1276 .dirty_inode = ext4_dirty_inode,
7ff9c073 1277 .drop_inode = ext4_drop_inode,
0930fcc1 1278 .evict_inode = ext4_evict_inode,
617ba13b 1279 .put_super = ext4_put_super,
617ba13b 1280 .sync_fs = ext4_sync_fs,
c4be0c1d
TS		 1281 .freeze_fs = ext4_freeze,
1282 .unfreeze_fs = ext4_unfreeze,
617ba13b
MC		 1283 .statfs = ext4_statfs,
1284 .remount_fs = ext4_remount,
617ba13b 1285 .show_options = ext4_show_options,
ac27a0ec 1286#ifdef CONFIG_QUOTA
617ba13b
MC		 1287 .quota_read = ext4_quota_read,
1288 .quota_write = ext4_quota_write,
ac27a0ec 1289#endif
c39a7f84 1290 .bdev_try_to_free_page = bdev_try_to_free_page,
ac27a0ec
DK		 1291};
1292
9ca92389
TT		 1293static const struct super_operations ext4_nojournal_sops = {
1294 .alloc_inode = ext4_alloc_inode,
1295 .destroy_inode = ext4_destroy_inode,
1296 .write_inode = ext4_write_inode,
1297 .dirty_inode = ext4_dirty_inode,
7ff9c073 1298 .drop_inode = ext4_drop_inode,
0930fcc1 1299 .evict_inode = ext4_evict_inode,
9ca92389
TT		 1300 .write_super = ext4_write_super,
1301 .put_super = ext4_put_super,
1302 .statfs = ext4_statfs,
1303 .remount_fs = ext4_remount,
9ca92389
TT		 1304 .show_options = ext4_show_options,
1305#ifdef CONFIG_QUOTA
1306 .quota_read = ext4_quota_read,
1307 .quota_write = ext4_quota_write,
1308#endif
1309 .bdev_try_to_free_page = bdev_try_to_free_page,
1310};
1311
39655164 1312static const struct export_operations ext4_export_ops = {
1b961ac0
CH		 1313 .fh_to_dentry = ext4_fh_to_dentry,
1314 .fh_to_parent = ext4_fh_to_parent,
617ba13b 1315 .get_parent = ext4_get_parent,
ac27a0ec
DK		 1316};
1317
1318enum {
1319 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
1320 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
01436ef2 1321 Opt_nouid32, Opt_debug, Opt_oldalloc, Opt_orlov,
ac27a0ec 1322 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
06705bff 1323 Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload, Opt_nobh, Opt_bh,
30773840 1324 Opt_commit, Opt_min_batch_time, Opt_max_batch_time,
c3191067 1325 Opt_journal_update, Opt_journal_dev,
818d276c 1326 Opt_journal_checksum, Opt_journal_async_commit,
ac27a0ec 1327 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
296c355c 1328 Opt_data_err_abort, Opt_data_err_ignore,
ac27a0ec 1329 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
5a20bdfc
JK		 1330 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
1331 Opt_noquota, Opt_ignore, Opt_barrier, Opt_nobarrier, Opt_err,
1332 Opt_resize, Opt_usrquota, Opt_grpquota, Opt_i_version,
1449032b
TT		 1333 Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_mblk_io_submit,
1334 Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity,
5328e635 1335 Opt_inode_readahead_blks, Opt_journal_ioprio,
744692dc 1336 Opt_dioread_nolock, Opt_dioread_lock,
5328e635 1337 Opt_discard, Opt_nodiscard,
bfff6873 1338 Opt_init_inode_table, Opt_noinit_inode_table,
ac27a0ec
DK		 1339};
1340
a447c093 1341static const match_table_t tokens = {
ac27a0ec
DK		 1342 {Opt_bsd_df, "bsddf"},
1343 {Opt_minix_df, "minixdf"},
1344 {Opt_grpid, "grpid"},
1345 {Opt_grpid, "bsdgroups"},
1346 {Opt_nogrpid, "nogrpid"},
1347 {Opt_nogrpid, "sysvgroups"},
1348 {Opt_resgid, "resgid=%u"},
1349 {Opt_resuid, "resuid=%u"},
1350 {Opt_sb, "sb=%u"},
1351 {Opt_err_cont, "errors=continue"},
1352 {Opt_err_panic, "errors=panic"},
1353 {Opt_err_ro, "errors=remount-ro"},
1354 {Opt_nouid32, "nouid32"},
ac27a0ec
DK		 1355 {Opt_debug, "debug"},
1356 {Opt_oldalloc, "oldalloc"},
1357 {Opt_orlov, "orlov"},
1358 {Opt_user_xattr, "user_xattr"},
1359 {Opt_nouser_xattr, "nouser_xattr"},
1360 {Opt_acl, "acl"},
1361 {Opt_noacl, "noacl"},
ac27a0ec 1362 {Opt_noload, "noload"},
e3bb52ae 1363 {Opt_noload, "norecovery"},
ac27a0ec
DK		 1364 {Opt_nobh, "nobh"},
1365 {Opt_bh, "bh"},
1366 {Opt_commit, "commit=%u"},
30773840
TT		 1367 {Opt_min_batch_time, "min_batch_time=%u"},
1368 {Opt_max_batch_time, "max_batch_time=%u"},
ac27a0ec 1369 {Opt_journal_update, "journal=update"},
ac27a0ec 1370 {Opt_journal_dev, "journal_dev=%u"},
818d276c
GS		 1371 {Opt_journal_checksum, "journal_checksum"},
1372 {Opt_journal_async_commit, "journal_async_commit"},
ac27a0ec
DK		 1373 {Opt_abort, "abort"},
1374 {Opt_data_journal, "data=journal"},
1375 {Opt_data_ordered, "data=ordered"},
1376 {Opt_data_writeback, "data=writeback"},
5bf5683a
HK		 1377 {Opt_data_err_abort, "data_err=abort"},
1378 {Opt_data_err_ignore, "data_err=ignore"},
ac27a0ec
DK		 1379 {Opt_offusrjquota, "usrjquota="},
1380 {Opt_usrjquota, "usrjquota=%s"},
1381 {Opt_offgrpjquota, "grpjquota="},
1382 {Opt_grpjquota, "grpjquota=%s"},
1383 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
1384 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
5a20bdfc 1385 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
ac27a0ec
DK		 1386 {Opt_grpquota, "grpquota"},
1387 {Opt_noquota, "noquota"},
1388 {Opt_quota, "quota"},
1389 {Opt_usrquota, "usrquota"},
1390 {Opt_barrier, "barrier=%u"},
06705bff
TT		 1391 {Opt_barrier, "barrier"},
1392 {Opt_nobarrier, "nobarrier"},
25ec56b5 1393 {Opt_i_version, "i_version"},
c9de560d 1394 {Opt_stripe, "stripe=%u"},
ac27a0ec 1395 {Opt_resize, "resize"},
64769240 1396 {Opt_delalloc, "delalloc"},
dd919b98 1397 {Opt_nodelalloc, "nodelalloc"},
1449032b
TT		 1398 {Opt_mblk_io_submit, "mblk_io_submit"},
1399 {Opt_nomblk_io_submit, "nomblk_io_submit"},
6fd058f7
TT		 1400 {Opt_block_validity, "block_validity"},
1401 {Opt_noblock_validity, "noblock_validity"},
240799cd 1402 {Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
b3881f74 1403 {Opt_journal_ioprio, "journal_ioprio=%u"},
afd4672d 1404 {Opt_auto_da_alloc, "auto_da_alloc=%u"},
06705bff
TT		 1405 {Opt_auto_da_alloc, "auto_da_alloc"},
1406 {Opt_noauto_da_alloc, "noauto_da_alloc"},
744692dc
JZ		 1407 {Opt_dioread_nolock, "dioread_nolock"},
1408 {Opt_dioread_lock, "dioread_lock"},
5328e635
ES		 1409 {Opt_discard, "discard"},
1410 {Opt_nodiscard, "nodiscard"},
bfff6873
LC		 1411 {Opt_init_inode_table, "init_itable=%u"},
1412 {Opt_init_inode_table, "init_itable"},
1413 {Opt_noinit_inode_table, "noinit_itable"},
f3f12faa 1414 {Opt_err, NULL},
ac27a0ec
DK		 1415};
1416
617ba13b 1417static ext4_fsblk_t get_sb_block(void **data)
ac27a0ec 1418{
617ba13b 1419 ext4_fsblk_t sb_block;
ac27a0ec
DK		 1420 char *options = (char *) *data;
1421
1422 if (!options || strncmp(options, "sb=", 3) != 0)
1423 return 1; /* Default location */
0b8e58a1 1424
ac27a0ec 1425 options += 3;
0b8e58a1 1426 /* TODO: use simple_strtoll with >32bit ext4 */
ac27a0ec
DK		 1427 sb_block = simple_strtoul(options, &options, 0);
1428 if (*options && *options != ',') {
4776004f 1429 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
ac27a0ec
DK		 1430 (char *) *data);
1431 return 1;
1432 }
1433 if (*options == ',')
1434 options++;
1435 *data = (void *) options;
0b8e58a1 1436
ac27a0ec
DK		 1437 return sb_block;
1438}
1439
b3881f74 1440#define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
437ca0fd
DM		 1441static char deprecated_msg[] = "Mount option \"%s\" will be removed by %s\n"
1442 "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
b3881f74 1443
56c50f11
DM		 1444#ifdef CONFIG_QUOTA
1445static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
1446{
1447 struct ext4_sb_info *sbi = EXT4_SB(sb);
1448 char *qname;
1449
1450 if (sb_any_quota_loaded(sb) &&
1451 !sbi->s_qf_names[qtype]) {
1452 ext4_msg(sb, KERN_ERR,
1453 "Cannot change journaled "
1454 "quota options when quota turned on");
1455 return 0;
1456 }
1457 qname = match_strdup(args);
1458 if (!qname) {
1459 ext4_msg(sb, KERN_ERR,
1460 "Not enough memory for storing quotafile name");
1461 return 0;
1462 }
1463 if (sbi->s_qf_names[qtype] &&
1464 strcmp(sbi->s_qf_names[qtype], qname)) {
1465 ext4_msg(sb, KERN_ERR,
1466 "%s quota file already specified", QTYPE2NAME(qtype));
1467 kfree(qname);
1468 return 0;
1469 }
1470 sbi->s_qf_names[qtype] = qname;
1471 if (strchr(sbi->s_qf_names[qtype], '/')) {
1472 ext4_msg(sb, KERN_ERR,
1473 "quotafile must be on filesystem root");
1474 kfree(sbi->s_qf_names[qtype]);
1475 sbi->s_qf_names[qtype] = NULL;
1476 return 0;
1477 }
fd8c37ec 1478 set_opt(sb, QUOTA);
56c50f11
DM		 1479 return 1;
1480}
1481
1482static int clear_qf_name(struct super_block *sb, int qtype)
1483{
1484
1485 struct ext4_sb_info *sbi = EXT4_SB(sb);
1486
1487 if (sb_any_quota_loaded(sb) &&
1488 sbi->s_qf_names[qtype]) {
1489 ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options"
1490 " when quota turned on");
1491 return 0;
1492 }
1493 /*
1494 * The space will be released later when all options are confirmed
1495 * to be correct
1496 */
1497 sbi->s_qf_names[qtype] = NULL;
1498 return 1;
1499}
1500#endif
1501
2b2d6d01 1502static int parse_options(char *options, struct super_block *sb,
c3191067 1503 unsigned long *journal_devnum,
b3881f74 1504 unsigned int *journal_ioprio,
2b2d6d01 1505 ext4_fsblk_t *n_blocks_count, int is_remount)
ac27a0ec 1506{
617ba13b 1507 struct ext4_sb_info *sbi = EXT4_SB(sb);
2b2d6d01 1508 char *p;
ac27a0ec
DK		 1509 substring_t args[MAX_OPT_ARGS];
1510 int data_opt = 0;
1511 int option;
1512#ifdef CONFIG_QUOTA
56c50f11 1513 int qfmt;
ac27a0ec
DK		 1514#endif
1515
1516 if (!options)
1517 return 1;
1518
2b2d6d01 1519 while ((p = strsep(&options, ",")) != NULL) {
ac27a0ec
DK		 1520 int token;
1521 if (!*p)
1522 continue;
1523
15121c18
ES		 1524 /*
1525 * Initialize args struct so we know whether arg was
1526 * found; some options take optional arguments.
1527 */
7dc57615 1528 args[0].to = args[0].from = NULL;
ac27a0ec
DK		 1529 token = match_token(p, tokens, args);
1530 switch (token) {
1531 case Opt_bsd_df:
437ca0fd 1532 ext4_msg(sb, KERN_WARNING, deprecated_msg, p, "2.6.38");
fd8c37ec 1533 clear_opt(sb, MINIX_DF);
ac27a0ec
DK		 1534 break;
1535 case Opt_minix_df:
437ca0fd 1536 ext4_msg(sb, KERN_WARNING, deprecated_msg, p, "2.6.38");
fd8c37ec 1537 set_opt(sb, MINIX_DF);
437ca0fd 1538
ac27a0ec
DK		 1539 break;
1540 case Opt_grpid:
437ca0fd 1541 ext4_msg(sb, KERN_WARNING, deprecated_msg, p, "2.6.38");
fd8c37ec 1542 set_opt(sb, GRPID);
437ca0fd 1543
ac27a0ec
DK		 1544 break;
1545 case Opt_nogrpid:
437ca0fd 1546 ext4_msg(sb, KERN_WARNING, deprecated_msg, p, "2.6.38");
fd8c37ec 1547 clear_opt(sb, GRPID);
437ca0fd 1548
ac27a0ec
DK		 1549 break;
1550 case Opt_resuid:
1551 if (match_int(&args[0], &option))
1552 return 0;
1553 sbi->s_resuid = option;
1554 break;
1555 case Opt_resgid:
1556 if (match_int(&args[0], &option))
1557 return 0;
1558 sbi->s_resgid = option;
1559 break;
1560 case Opt_sb:
1561 /* handled by get_sb_block() instead of here */
1562 /* *sb_block = match_int(&args[0]); */
1563 break;
1564 case Opt_err_panic:
fd8c37ec
TT		 1565 clear_opt(sb, ERRORS_CONT);
1566 clear_opt(sb, ERRORS_RO);
1567 set_opt(sb, ERRORS_PANIC);
ac27a0ec
DK		 1568 break;
1569 case Opt_err_ro:
fd8c37ec
TT		 1570 clear_opt(sb, ERRORS_CONT);
1571 clear_opt(sb, ERRORS_PANIC);
1572 set_opt(sb, ERRORS_RO);
ac27a0ec
DK		 1573 break;
1574 case Opt_err_cont:
fd8c37ec
TT		 1575 clear_opt(sb, ERRORS_RO);
1576 clear_opt(sb, ERRORS_PANIC);
1577 set_opt(sb, ERRORS_CONT);
ac27a0ec
DK		 1578 break;
1579 case Opt_nouid32:
fd8c37ec 1580 set_opt(sb, NO_UID32);
ac27a0ec 1581 break;
ac27a0ec 1582 case Opt_debug:
fd8c37ec 1583 set_opt(sb, DEBUG);
ac27a0ec
DK		 1584 break;
1585 case Opt_oldalloc:
fd8c37ec 1586 set_opt(sb, OLDALLOC);
ac27a0ec
DK		 1587 break;
1588 case Opt_orlov:
fd8c37ec 1589 clear_opt(sb, OLDALLOC);
ac27a0ec 1590 break;
03010a33 1591#ifdef CONFIG_EXT4_FS_XATTR
ac27a0ec 1592 case Opt_user_xattr:
fd8c37ec 1593 set_opt(sb, XATTR_USER);
ac27a0ec
DK		 1594 break;
1595 case Opt_nouser_xattr:
fd8c37ec 1596 clear_opt(sb, XATTR_USER);
ac27a0ec
DK		 1597 break;
1598#else
1599 case Opt_user_xattr:
1600 case Opt_nouser_xattr:
b31e1552 1601 ext4_msg(sb, KERN_ERR, "(no)user_xattr options not supported");
ac27a0ec
DK		 1602 break;
1603#endif
03010a33 1604#ifdef CONFIG_EXT4_FS_POSIX_ACL
ac27a0ec 1605 case Opt_acl:
fd8c37ec 1606 set_opt(sb, POSIX_ACL);
ac27a0ec
DK		 1607 break;
1608 case Opt_noacl:
fd8c37ec 1609 clear_opt(sb, POSIX_ACL);
ac27a0ec
DK		 1610 break;
1611#else
1612 case Opt_acl:
1613 case Opt_noacl:
b31e1552 1614 ext4_msg(sb, KERN_ERR, "(no)acl options not supported");
ac27a0ec
DK		 1615 break;
1616#endif
ac27a0ec
DK		 1617 case Opt_journal_update:
1618 /* @@@ FIXME */
1619 /* Eventually we will want to be able to create
1620 a journal file here. For now, only allow the
1621 user to specify an existing inode to be the
1622 journal file. */
1623 if (is_remount) {
b31e1552
ES		 1624 ext4_msg(sb, KERN_ERR,
1625 "Cannot specify journal on remount");
ac27a0ec
DK		 1626 return 0;
1627 }
fd8c37ec 1628 set_opt(sb, UPDATE_JOURNAL);
ac27a0ec 1629 break;
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) {
482a7425 1685 if (test_opt(sb, DATA_FLAGS) != data_opt) {
b31e1552
ES		 1686 ext4_msg(sb, KERN_ERR,
1687 "Cannot change data mode on remount");
ac27a0ec
DK		 1688 return 0;
1689 }
1690 } else {
fd8c37ec 1691 clear_opt(sb, DATA_FLAGS);
ac27a0ec
DK		 1692 sbi->s_mount_opt |= data_opt;
1693 }
1694 break;
5bf5683a 1695 case Opt_data_err_abort:
fd8c37ec 1696 set_opt(sb, DATA_ERR_ABORT);
5bf5683a
HK		 1697 break;
1698 case Opt_data_err_ignore:
fd8c37ec 1699 clear_opt(sb, DATA_ERR_ABORT);
5bf5683a 1700 break;
ac27a0ec
DK		 1701#ifdef CONFIG_QUOTA
1702 case Opt_usrjquota:
56c50f11 1703 if (!set_qf_name(sb, USRQUOTA, &args[0]))
ac27a0ec 1704 return 0;
56c50f11
DM		 1705 break;
1706 case Opt_grpjquota:
1707 if (!set_qf_name(sb, GRPQUOTA, &args[0]))
ac27a0ec 1708 return 0;
ac27a0ec
DK		 1709 break;
1710 case Opt_offusrjquota:
56c50f11
DM		 1711 if (!clear_qf_name(sb, USRQUOTA))
1712 return 0;
1713 break;
ac27a0ec 1714 case Opt_offgrpjquota:
56c50f11 1715 if (!clear_qf_name(sb, GRPQUOTA))
ac27a0ec 1716 return 0;
ac27a0ec 1717 break;
56c50f11 1718
ac27a0ec 1719 case Opt_jqfmt_vfsold:
dfc5d03f
JK		 1720 qfmt = QFMT_VFS_OLD;
1721 goto set_qf_format;
ac27a0ec 1722 case Opt_jqfmt_vfsv0:
dfc5d03f 1723 qfmt = QFMT_VFS_V0;
5a20bdfc
JK		 1724 goto set_qf_format;
1725 case Opt_jqfmt_vfsv1:
1726 qfmt = QFMT_VFS_V1;
dfc5d03f 1727set_qf_format:
17bd13b3 1728 if (sb_any_quota_loaded(sb) &&
dfc5d03f 1729 sbi->s_jquota_fmt != qfmt) {
b31e1552 1730 ext4_msg(sb, KERN_ERR, "Cannot change "
dfc5d03f 1731 "journaled quota options when "
b31e1552 1732 "quota turned on");
dfc5d03f
JK		 1733 return 0;
1734 }
1735 sbi->s_jquota_fmt = qfmt;
ac27a0ec
DK		 1736 break;
1737 case Opt_quota:
1738 case Opt_usrquota:
fd8c37ec
TT		 1739 set_opt(sb, QUOTA);
1740 set_opt(sb, USRQUOTA);
ac27a0ec
DK		 1741 break;
1742 case Opt_grpquota:
fd8c37ec
TT		 1743 set_opt(sb, QUOTA);
1744 set_opt(sb, GRPQUOTA);
ac27a0ec
DK		 1745 break;
1746 case Opt_noquota:
17bd13b3 1747 if (sb_any_quota_loaded(sb)) {
b31e1552
ES		 1748 ext4_msg(sb, KERN_ERR, "Cannot change quota "
1749 "options when quota turned on");
ac27a0ec
DK		 1750 return 0;
1751 }
fd8c37ec
TT		 1752 clear_opt(sb, QUOTA);
1753 clear_opt(sb, USRQUOTA);
1754 clear_opt(sb, GRPQUOTA);
ac27a0ec
DK		 1755 break;
1756#else
1757 case Opt_quota:
1758 case Opt_usrquota:
1759 case Opt_grpquota:
b31e1552
ES		 1760 ext4_msg(sb, KERN_ERR,
1761 "quota options not supported");
cd59e7b9 1762 break;
ac27a0ec
DK		 1763 case Opt_usrjquota:
1764 case Opt_grpjquota:
1765 case Opt_offusrjquota:
1766 case Opt_offgrpjquota:
1767 case Opt_jqfmt_vfsold:
1768 case Opt_jqfmt_vfsv0:
5a20bdfc 1769 case Opt_jqfmt_vfsv1:
b31e1552
ES		 1770 ext4_msg(sb, KERN_ERR,
1771 "journaled quota options not supported");
ac27a0ec
DK		 1772 break;
1773 case Opt_noquota:
1774 break;
1775#endif
1776 case Opt_abort:
4ab2f15b 1777 sbi->s_mount_flags |= EXT4_MF_FS_ABORTED;
ac27a0ec 1778 break;
06705bff 1779 case Opt_nobarrier:
fd8c37ec 1780 clear_opt(sb, BARRIER);
06705bff 1781 break;
ac27a0ec 1782 case Opt_barrier:
15121c18
ES		 1783 if (args[0].from) {
1784 if (match_int(&args[0], &option))
1785 return 0;
1786 } else
1787 option = 1; /* No argument, default to 1 */
ac27a0ec 1788 if (option)
fd8c37ec 1789 set_opt(sb, BARRIER);
ac27a0ec 1790 else
fd8c37ec 1791 clear_opt(sb, BARRIER);
ac27a0ec
DK		 1792 break;
1793 case Opt_ignore:
1794 break;
1795 case Opt_resize:
1796 if (!is_remount) {
b31e1552
ES		 1797 ext4_msg(sb, KERN_ERR,
1798 "resize option only available "
1799 "for remount");
ac27a0ec
DK		 1800 return 0;
1801 }
1802 if (match_int(&args[0], &option) != 0)
1803 return 0;
1804 *n_blocks_count = option;
1805 break;
1806 case Opt_nobh:
206f7ab4
CH		 1807 ext4_msg(sb, KERN_WARNING,
1808 "Ignoring deprecated nobh option");
ac27a0ec
DK		 1809 break;
1810 case Opt_bh:
206f7ab4
CH		 1811 ext4_msg(sb, KERN_WARNING,
1812 "Ignoring deprecated bh option");
ac27a0ec 1813 break;
25ec56b5 1814 case Opt_i_version:
fd8c37ec 1815 set_opt(sb, I_VERSION);
25ec56b5
JNC		 1816 sb->s_flags |= MS_I_VERSION;
1817 break;
dd919b98 1818 case Opt_nodelalloc:
fd8c37ec 1819 clear_opt(sb, DELALLOC);
56889787 1820 clear_opt2(sb, EXPLICIT_DELALLOC);
dd919b98 1821 break;
1449032b 1822 case Opt_mblk_io_submit:
fd8c37ec 1823 set_opt(sb, MBLK_IO_SUBMIT);
1449032b
TT		 1824 break;
1825 case Opt_nomblk_io_submit:
fd8c37ec 1826 clear_opt(sb, MBLK_IO_SUBMIT);
1449032b 1827 break;
c9de560d
AT		 1828 case Opt_stripe:
1829 if (match_int(&args[0], &option))
1830 return 0;
1831 if (option < 0)
1832 return 0;
1833 sbi->s_stripe = option;
1834 break;
64769240 1835 case Opt_delalloc:
fd8c37ec 1836 set_opt(sb, DELALLOC);
56889787 1837 set_opt2(sb, EXPLICIT_DELALLOC);
64769240 1838 break;
6fd058f7 1839 case Opt_block_validity:
fd8c37ec 1840 set_opt(sb, BLOCK_VALIDITY);
6fd058f7
TT		 1841 break;
1842 case Opt_noblock_validity:
fd8c37ec 1843 clear_opt(sb, BLOCK_VALIDITY);
6fd058f7 1844 break;
240799cd
TT		 1845 case Opt_inode_readahead_blks:
1846 if (match_int(&args[0], &option))
1847 return 0;
1848 if (option < 0 || option > (1 << 30))
1849 return 0;
5dbd571d 1850 if (option && !is_power_of_2(option)) {
b31e1552
ES		 1851 ext4_msg(sb, KERN_ERR,
1852 "EXT4-fs: inode_readahead_blks"
1853 " must be a power of 2");
3197ebdb
TT		 1854 return 0;
1855 }
240799cd
TT		 1856 sbi->s_inode_readahead_blks = option;
1857 break;
b3881f74
TT		 1858 case Opt_journal_ioprio:
1859 if (match_int(&args[0], &option))
1860 return 0;
1861 if (option < 0 || option > 7)
1862 break;
1863 *journal_ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE,
1864 option);
1865 break;
06705bff 1866 case Opt_noauto_da_alloc:
fd8c37ec 1867 set_opt(sb, NO_AUTO_DA_ALLOC);
06705bff 1868 break;
afd4672d 1869 case Opt_auto_da_alloc:
15121c18
ES		 1870 if (args[0].from) {
1871 if (match_int(&args[0], &option))
1872 return 0;
1873 } else
1874 option = 1; /* No argument, default to 1 */
afd4672d 1875 if (option)
fd8c37ec 1876 clear_opt(sb, NO_AUTO_DA_ALLOC);
afd4672d 1877 else
fd8c37ec 1878 set_opt(sb,NO_AUTO_DA_ALLOC);
afd4672d 1879 break;
5328e635 1880 case Opt_discard:
fd8c37ec 1881 set_opt(sb, DISCARD);
5328e635
ES		 1882 break;
1883 case Opt_nodiscard:
fd8c37ec 1884 clear_opt(sb, DISCARD);
5328e635 1885 break;
744692dc 1886 case Opt_dioread_nolock:
fd8c37ec 1887 set_opt(sb, DIOREAD_NOLOCK);
744692dc
JZ		 1888 break;
1889 case Opt_dioread_lock:
fd8c37ec 1890 clear_opt(sb, DIOREAD_NOLOCK);
744692dc 1891 break;
bfff6873 1892 case Opt_init_inode_table:
fd8c37ec 1893 set_opt(sb, INIT_INODE_TABLE);
bfff6873
LC		 1894 if (args[0].from) {
1895 if (match_int(&args[0], &option))
1896 return 0;
1897 } else
1898 option = EXT4_DEF_LI_WAIT_MULT;
1899 if (option < 0)
1900 return 0;
1901 sbi->s_li_wait_mult = option;
1902 break;
1903 case Opt_noinit_inode_table:
fd8c37ec 1904 clear_opt(sb, INIT_INODE_TABLE);
bfff6873 1905 break;
ac27a0ec 1906 default:
b31e1552
ES		 1907 ext4_msg(sb, KERN_ERR,
1908 "Unrecognized mount option \"%s\" "
1909 "or missing value", p);
ac27a0ec
DK		 1910 return 0;
1911 }
1912 }
1913#ifdef CONFIG_QUOTA
1914 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
482a7425 1915 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
fd8c37ec 1916 clear_opt(sb, USRQUOTA);
ac27a0ec 1917
482a7425 1918 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
fd8c37ec 1919 clear_opt(sb, GRPQUOTA);
ac27a0ec 1920
56c50f11 1921 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
b31e1552
ES		 1922 ext4_msg(sb, KERN_ERR, "old and new quota "
1923 "format mixing");
ac27a0ec
DK		 1924 return 0;
1925 }
1926
1927 if (!sbi->s_jquota_fmt) {
b31e1552
ES		 1928 ext4_msg(sb, KERN_ERR, "journaled quota format "
1929 "not specified");
ac27a0ec
DK		 1930 return 0;
1931 }
1932 } else {
1933 if (sbi->s_jquota_fmt) {
b31e1552 1934 ext4_msg(sb, KERN_ERR, "journaled quota format "
2c8be6b2 1935 "specified with no journaling "
b31e1552 1936 "enabled");
ac27a0ec
DK		 1937 return 0;
1938 }
1939 }
1940#endif
1941 return 1;
1942}
1943
617ba13b 1944static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
ac27a0ec
DK		 1945 int read_only)
1946{
617ba13b 1947 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec
DK		 1948 int res = 0;
1949
617ba13b 1950 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
b31e1552
ES		 1951 ext4_msg(sb, KERN_ERR, "revision level too high, "
1952 "forcing read-only mode");
ac27a0ec
DK		 1953 res = MS_RDONLY;
1954 }
1955 if (read_only)
281b5995 1956 goto done;
617ba13b 1957 if (!(sbi->s_mount_state & EXT4_VALID_FS))
b31e1552
ES		 1958 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
1959 "running e2fsck is recommended");
617ba13b 1960 else if ((sbi->s_mount_state & EXT4_ERROR_FS))
b31e1552
ES		 1961 ext4_msg(sb, KERN_WARNING,
1962 "warning: mounting fs with errors, "
1963 "running e2fsck is recommended");
ed3ce80a 1964 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
ac27a0ec
DK		 1965 le16_to_cpu(es->s_mnt_count) >=
1966 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
b31e1552
ES		 1967 ext4_msg(sb, KERN_WARNING,
1968 "warning: maximal mount count reached, "
1969 "running e2fsck is recommended");
ac27a0ec
DK		 1970 else if (le32_to_cpu(es->s_checkinterval) &&
1971 (le32_to_cpu(es->s_lastcheck) +
1972 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
b31e1552
ES		 1973 ext4_msg(sb, KERN_WARNING,
1974 "warning: checktime reached, "
1975 "running e2fsck is recommended");
0b8e58a1 1976 if (!sbi->s_journal)
0390131b 1977 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
ac27a0ec 1978 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
617ba13b 1979 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
e8546d06 1980 le16_add_cpu(&es->s_mnt_count, 1);
ac27a0ec 1981 es->s_mtime = cpu_to_le32(get_seconds());
617ba13b 1982 ext4_update_dynamic_rev(sb);
0390131b
FM		 1983 if (sbi->s_journal)
1984 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
ac27a0ec 1985
e2d67052 1986 ext4_commit_super(sb, 1);
281b5995 1987done:
ac27a0ec 1988 if (test_opt(sb, DEBUG))
a9df9a49 1989 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
a2595b8a 1990 "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
ac27a0ec
DK		 1991 sb->s_blocksize,
1992 sbi->s_groups_count,
617ba13b
MC		 1993 EXT4_BLOCKS_PER_GROUP(sb),
1994 EXT4_INODES_PER_GROUP(sb),
a2595b8a 1995 sbi->s_mount_opt, sbi->s_mount_opt2);
ac27a0ec 1996
7abc52c2 1997 cleancache_init_fs(sb);
ac27a0ec
DK		 1998 return res;
1999}
2000
772cb7c8
JS		 2001static int ext4_fill_flex_info(struct super_block *sb)
2002{
2003 struct ext4_sb_info *sbi = EXT4_SB(sb);
2004 struct ext4_group_desc *gdp = NULL;
772cb7c8
JS		 2005 ext4_group_t flex_group_count;
2006 ext4_group_t flex_group;
2007 int groups_per_flex = 0;
c5ca7c76 2008 size_t size;
772cb7c8
JS		 2009 int i;
2010
503358ae
TT		 2011 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
2012 groups_per_flex = 1 << sbi->s_log_groups_per_flex;
2013
2014 if (groups_per_flex < 2) {
772cb7c8
JS		 2015 sbi->s_log_groups_per_flex = 0;
2016 return 1;
2017 }
2018
c62a11fd
FB		 2019 /* We allocate both existing and potentially added groups */
2020 flex_group_count = ((sbi->s_groups_count + groups_per_flex - 1) +
d94e99a6
AK		 2021 ((le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) + 1) <<
2022 EXT4_DESC_PER_BLOCK_BITS(sb))) / groups_per_flex;
c5ca7c76 2023 size = flex_group_count * sizeof(struct flex_groups);
9933fc0a 2024 sbi->s_flex_groups = ext4_kvzalloc(size, GFP_KERNEL);
c5ca7c76 2025 if (sbi->s_flex_groups == NULL) {
9933fc0a
TT		 2026 ext4_msg(sb, KERN_ERR, "not enough memory for %u flex groups",
2027 flex_group_count);
2028 goto failed;
772cb7c8 2029 }
772cb7c8 2030
772cb7c8 2031 for (i = 0; i < sbi->s_groups_count; i++) {
88b6edd1 2032 gdp = ext4_get_group_desc(sb, i, NULL);
772cb7c8
JS		 2033
2034 flex_group = ext4_flex_group(sbi, i);
7ad9bb65
TT		 2035 atomic_add(ext4_free_inodes_count(sb, gdp),
2036 &sbi->s_flex_groups[flex_group].free_inodes);
2037 atomic_add(ext4_free_blks_count(sb, gdp),
24aaa8ef 2038 &sbi->s_flex_groups[flex_group].free_clusters);
7ad9bb65
TT		 2039 atomic_add(ext4_used_dirs_count(sb, gdp),
2040 &sbi->s_flex_groups[flex_group].used_dirs);
772cb7c8
JS		 2041 }
2042
2043 return 1;
2044failed:
2045 return 0;
2046}
2047
717d50e4
AD		 2048__le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
2049 struct ext4_group_desc *gdp)
2050{
2051 __u16 crc = 0;
2052
2053 if (sbi->s_es->s_feature_ro_compat &
2054 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) {
2055 int offset = offsetof(struct ext4_group_desc, bg_checksum);
2056 __le32 le_group = cpu_to_le32(block_group);
2057
2058 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
2059 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
2060 crc = crc16(crc, (__u8 *)gdp, offset);
2061 offset += sizeof(gdp->bg_checksum); /* skip checksum */
2062 /* for checksum of struct ext4_group_desc do the rest...*/
2063 if ((sbi->s_es->s_feature_incompat &
2064 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) &&
2065 offset < le16_to_cpu(sbi->s_es->s_desc_size))
2066 crc = crc16(crc, (__u8 *)gdp + offset,
2067 le16_to_cpu(sbi->s_es->s_desc_size) -
2068 offset);
2069 }
2070
2071 return cpu_to_le16(crc);
2072}
2073
2074int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 block_group,
2075 struct ext4_group_desc *gdp)
2076{
2077 if ((sbi->s_es->s_feature_ro_compat &
2078 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) &&
2079 (gdp->bg_checksum != ext4_group_desc_csum(sbi, block_group, gdp)))
2080 return 0;
2081
2082 return 1;
2083}
2084
ac27a0ec 2085/* Called at mount-time, super-block is locked */
bfff6873
LC		 2086static int ext4_check_descriptors(struct super_block *sb,
2087 ext4_group_t *first_not_zeroed)
ac27a0ec 2088{
617ba13b
MC		 2089 struct ext4_sb_info *sbi = EXT4_SB(sb);
2090 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
2091 ext4_fsblk_t last_block;
bd81d8ee
LV		 2092 ext4_fsblk_t block_bitmap;
2093 ext4_fsblk_t inode_bitmap;
2094 ext4_fsblk_t inode_table;
ce421581 2095 int flexbg_flag = 0;
bfff6873 2096 ext4_group_t i, grp = sbi->s_groups_count;
ac27a0ec 2097
ce421581
JS		 2098 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
2099 flexbg_flag = 1;
2100
af5bc92d 2101 ext4_debug("Checking group descriptors");
ac27a0ec 2102
197cd65a
AM		 2103 for (i = 0; i < sbi->s_groups_count; i++) {
2104 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
2105
ce421581 2106 if (i == sbi->s_groups_count - 1 || flexbg_flag)
bd81d8ee 2107 last_block = ext4_blocks_count(sbi->s_es) - 1;
ac27a0ec
DK		 2108 else
2109 last_block = first_block +
617ba13b 2110 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
ac27a0ec 2111
bfff6873
LC		 2112 if ((grp == sbi->s_groups_count) &&
2113 !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2114 grp = i;
2115
8fadc143 2116 block_bitmap = ext4_block_bitmap(sb, gdp);
2b2d6d01 2117 if (block_bitmap < first_block || block_bitmap > last_block) {
b31e1552 2118 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2119 "Block bitmap for group %u not in group "
b31e1552 2120 "(block %llu)!", i, block_bitmap);
ac27a0ec
DK		 2121 return 0;
2122 }
8fadc143 2123 inode_bitmap = ext4_inode_bitmap(sb, gdp);
2b2d6d01 2124 if (inode_bitmap < first_block || inode_bitmap > last_block) {
b31e1552 2125 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2126 "Inode bitmap for group %u not in group "
b31e1552 2127 "(block %llu)!", i, inode_bitmap);
ac27a0ec
DK		 2128 return 0;
2129 }
8fadc143 2130 inode_table = ext4_inode_table(sb, gdp);
bd81d8ee 2131 if (inode_table < first_block ||
2b2d6d01 2132 inode_table + sbi->s_itb_per_group - 1 > last_block) {
b31e1552 2133 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2134 "Inode table for group %u not in group "
b31e1552 2135 "(block %llu)!", i, inode_table);
ac27a0ec
DK		 2136 return 0;
2137 }
955ce5f5 2138 ext4_lock_group(sb, i);
717d50e4 2139 if (!ext4_group_desc_csum_verify(sbi, i, gdp)) {
b31e1552
ES		 2140 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2141 "Checksum for group %u failed (%u!=%u)",
2142 i, le16_to_cpu(ext4_group_desc_csum(sbi, i,
2143 gdp)), le16_to_cpu(gdp->bg_checksum));
7ee1ec4c 2144 if (!(sb->s_flags & MS_RDONLY)) {
955ce5f5 2145 ext4_unlock_group(sb, i);
8a266467 2146 return 0;
7ee1ec4c 2147 }
717d50e4 2148 }
955ce5f5 2149 ext4_unlock_group(sb, i);
ce421581
JS		 2150 if (!flexbg_flag)
2151 first_block += EXT4_BLOCKS_PER_GROUP(sb);
ac27a0ec 2152 }
bfff6873
LC		 2153 if (NULL != first_not_zeroed)
2154 *first_not_zeroed = grp;
ac27a0ec 2155
bd81d8ee 2156 ext4_free_blocks_count_set(sbi->s_es, ext4_count_free_blocks(sb));
0b8e58a1 2157 sbi->s_es->s_free_inodes_count =cpu_to_le32(ext4_count_free_inodes(sb));
ac27a0ec
DK		 2158 return 1;
2159}
2160
617ba13b 2161/* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
ac27a0ec
DK		 2162 * the superblock) which were deleted from all directories, but held open by
2163 * a process at the time of a crash. We walk the list and try to delete these
2164 * inodes at recovery time (only with a read-write filesystem).
2165 *
2166 * In order to keep the orphan inode chain consistent during traversal (in
2167 * case of crash during recovery), we link each inode into the superblock
2168 * orphan list_head and handle it the same way as an inode deletion during
2169 * normal operation (which journals the operations for us).
2170 *
2171 * We only do an iget() and an iput() on each inode, which is very safe if we
2172 * accidentally point at an in-use or already deleted inode. The worst that
2173 * can happen in this case is that we get a "bit already cleared" message from
617ba13b 2174 * ext4_free_inode(). The only reason we would point at a wrong inode is if
ac27a0ec
DK		 2175 * e2fsck was run on this filesystem, and it must have already done the orphan
2176 * inode cleanup for us, so we can safely abort without any further action.
2177 */
2b2d6d01
TT		 2178static void ext4_orphan_cleanup(struct super_block *sb,
2179 struct ext4_super_block *es)
ac27a0ec
DK		 2180{
2181 unsigned int s_flags = sb->s_flags;
2182 int nr_orphans = 0, nr_truncates = 0;
2183#ifdef CONFIG_QUOTA
2184 int i;
2185#endif
2186 if (!es->s_last_orphan) {
2187 jbd_debug(4, "no orphan inodes to clean up\n");
2188 return;
2189 }
2190
a8f48a95 2191 if (bdev_read_only(sb->s_bdev)) {
b31e1552
ES		 2192 ext4_msg(sb, KERN_ERR, "write access "
2193 "unavailable, skipping orphan cleanup");
a8f48a95
ES		 2194 return;
2195 }
2196
d39195c3
AG		 2197 /* Check if feature set would not allow a r/w mount */
2198 if (!ext4_feature_set_ok(sb, 0)) {
2199 ext4_msg(sb, KERN_INFO, "Skipping orphan cleanup due to "
2200 "unknown ROCOMPAT features");
2201 return;
2202 }
2203
617ba13b 2204 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
ac27a0ec
DK		 2205 if (es->s_last_orphan)
2206 jbd_debug(1, "Errors on filesystem, "
2207 "clearing orphan list.\n");
2208 es->s_last_orphan = 0;
2209 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2210 return;
2211 }
2212
2213 if (s_flags & MS_RDONLY) {
b31e1552 2214 ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
ac27a0ec
DK		 2215 sb->s_flags &= ~MS_RDONLY;
2216 }
2217#ifdef CONFIG_QUOTA
2218 /* Needed for iput() to work correctly and not trash data */
2219 sb->s_flags |= MS_ACTIVE;
2220 /* Turn on quotas so that they are updated correctly */
2221 for (i = 0; i < MAXQUOTAS; i++) {
617ba13b
MC		 2222 if (EXT4_SB(sb)->s_qf_names[i]) {
2223 int ret = ext4_quota_on_mount(sb, i);
ac27a0ec 2224 if (ret < 0)
b31e1552
ES		 2225 ext4_msg(sb, KERN_ERR,
2226 "Cannot turn on journaled "
2227 "quota: error %d", ret);
ac27a0ec
DK		 2228 }
2229 }
2230#endif
2231
2232 while (es->s_last_orphan) {
2233 struct inode *inode;
2234
97bd42b9
JB		 2235 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
2236 if (IS_ERR(inode)) {
ac27a0ec
DK		 2237 es->s_last_orphan = 0;
2238 break;
2239 }
2240
617ba13b 2241 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
871a2931 2242 dquot_initialize(inode);
ac27a0ec 2243 if (inode->i_nlink) {
b31e1552
ES		 2244 ext4_msg(sb, KERN_DEBUG,
2245 "%s: truncating inode %lu to %lld bytes",
46e665e9 2246 __func__, inode->i_ino, inode->i_size);
e5f8eab8 2247 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
ac27a0ec 2248 inode->i_ino, inode->i_size);
617ba13b 2249 ext4_truncate(inode);
ac27a0ec
DK		 2250 nr_truncates++;
2251 } else {
b31e1552
ES		 2252 ext4_msg(sb, KERN_DEBUG,
2253 "%s: deleting unreferenced inode %lu",
46e665e9 2254 __func__, inode->i_ino);
ac27a0ec
DK		 2255 jbd_debug(2, "deleting unreferenced inode %lu\n",
2256 inode->i_ino);
2257 nr_orphans++;
2258 }
2259 iput(inode); /* The delete magic happens here! */
2260 }
2261
2b2d6d01 2262#define PLURAL(x) (x), ((x) == 1) ? "" : "s"
ac27a0ec
DK		 2263
2264 if (nr_orphans)
b31e1552
ES		 2265 ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
2266 PLURAL(nr_orphans));
ac27a0ec 2267 if (nr_truncates)
b31e1552
ES		 2268 ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
2269 PLURAL(nr_truncates));
ac27a0ec
DK		 2270#ifdef CONFIG_QUOTA
2271 /* Turn quotas off */
2272 for (i = 0; i < MAXQUOTAS; i++) {
2273 if (sb_dqopt(sb)->files[i])
287a8095 2274 dquot_quota_off(sb, i);
ac27a0ec
DK		 2275 }
2276#endif
2277 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
2278}
0b8e58a1 2279
cd2291a4
ES		 2280/*
2281 * Maximal extent format file size.
2282 * Resulting logical blkno at s_maxbytes must fit in our on-disk
2283 * extent format containers, within a sector_t, and within i_blocks
2284 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
2285 * so that won't be a limiting factor.
2286 *
f17722f9
LC		 2287 * However there is other limiting factor. We do store extents in the form
2288 * of starting block and length, hence the resulting length of the extent
2289 * covering maximum file size must fit into on-disk format containers as
2290 * well. Given that length is always by 1 unit bigger than max unit (because
2291 * we count 0 as well) we have to lower the s_maxbytes by one fs block.
2292 *
cd2291a4
ES		 2293 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
2294 */
f287a1a5 2295static loff_t ext4_max_size(int blkbits, int has_huge_files)
cd2291a4
ES		 2296{
2297 loff_t res;
2298 loff_t upper_limit = MAX_LFS_FILESIZE;
2299
2300 /* small i_blocks in vfs inode? */
f287a1a5 2301 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
cd2291a4 2302 /*
90c699a9 2303 * CONFIG_LBDAF is not enabled implies the inode
cd2291a4
ES		 2304 * i_block represent total blocks in 512 bytes
2305 * 32 == size of vfs inode i_blocks * 8
2306 */
2307 upper_limit = (1LL << 32) - 1;
2308
2309 /* total blocks in file system block size */
2310 upper_limit >>= (blkbits - 9);
2311 upper_limit <<= blkbits;
2312 }
2313
f17722f9
LC		 2314 /*
2315 * 32-bit extent-start container, ee_block. We lower the maxbytes
2316 * by one fs block, so ee_len can cover the extent of maximum file
2317 * size
2318 */
2319 res = (1LL << 32) - 1;
cd2291a4 2320 res <<= blkbits;
cd2291a4
ES		 2321
2322 /* Sanity check against vm- & vfs- imposed limits */
2323 if (res > upper_limit)
2324 res = upper_limit;
2325
2326 return res;
2327}
ac27a0ec 2328
ac27a0ec 2329/*
cd2291a4 2330 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
0fc1b451
AK		 2331 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2332 * We need to be 1 filesystem block less than the 2^48 sector limit.
ac27a0ec 2333 */
f287a1a5 2334static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
ac27a0ec 2335{
617ba13b 2336 loff_t res = EXT4_NDIR_BLOCKS;
0fc1b451
AK		 2337 int meta_blocks;
2338 loff_t upper_limit;
0b8e58a1
AD		 2339 /* This is calculated to be the largest file size for a dense, block
2340 * mapped file such that the file's total number of 512-byte sectors,
2341 * including data and all indirect blocks, does not exceed (2^48 - 1).
2342 *
2343 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2344 * number of 512-byte sectors of the file.
0fc1b451
AK		 2345 */
2346
f287a1a5 2347 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
0fc1b451 2348 /*
90c699a9 2349 * !has_huge_files or CONFIG_LBDAF not enabled implies that
0b8e58a1
AD		 2350 * the inode i_block field represents total file blocks in
2351 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
0fc1b451
AK		 2352 */
2353 upper_limit = (1LL << 32) - 1;
2354
2355 /* total blocks in file system block size */
2356 upper_limit >>= (bits - 9);
2357
2358 } else {
8180a562
AK		 2359 /*
2360 * We use 48 bit ext4_inode i_blocks
2361 * With EXT4_HUGE_FILE_FL set the i_blocks
2362 * represent total number of blocks in
2363 * file system block size
2364 */
0fc1b451
AK		 2365 upper_limit = (1LL << 48) - 1;
2366
0fc1b451
AK		 2367 }
2368
2369 /* indirect blocks */
2370 meta_blocks = 1;
2371 /* double indirect blocks */
2372 meta_blocks += 1 + (1LL << (bits-2));
2373 /* tripple indirect blocks */
2374 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
2375
2376 upper_limit -= meta_blocks;
2377 upper_limit <<= bits;
ac27a0ec
DK		 2378
2379 res += 1LL << (bits-2);
2380 res += 1LL << (2*(bits-2));
2381 res += 1LL << (3*(bits-2));
2382 res <<= bits;
2383 if (res > upper_limit)
2384 res = upper_limit;
0fc1b451
AK		 2385
2386 if (res > MAX_LFS_FILESIZE)
2387 res = MAX_LFS_FILESIZE;
2388
ac27a0ec
DK		 2389 return res;
2390}
2391
617ba13b 2392static ext4_fsblk_t descriptor_loc(struct super_block *sb,
0b8e58a1 2393 ext4_fsblk_t logical_sb_block, int nr)
ac27a0ec 2394{
617ba13b 2395 struct ext4_sb_info *sbi = EXT4_SB(sb);
fd2d4291 2396 ext4_group_t bg, first_meta_bg;
ac27a0ec
DK		 2397 int has_super = 0;
2398
2399 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
2400
617ba13b 2401 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
ac27a0ec 2402 nr < first_meta_bg)
70bbb3e0 2403 return logical_sb_block + nr + 1;
ac27a0ec 2404 bg = sbi->s_desc_per_block * nr;
617ba13b 2405 if (ext4_bg_has_super(sb, bg))
ac27a0ec 2406 has_super = 1;
0b8e58a1 2407
617ba13b 2408 return (has_super + ext4_group_first_block_no(sb, bg));
ac27a0ec
DK		 2409}
2410
c9de560d
AT		 2411/**
2412 * ext4_get_stripe_size: Get the stripe size.
2413 * @sbi: In memory super block info
2414 *
2415 * If we have specified it via mount option, then
2416 * use the mount option value. If the value specified at mount time is
2417 * greater than the blocks per group use the super block value.
2418 * If the super block value is greater than blocks per group return 0.
2419 * Allocator needs it be less than blocks per group.
2420 *
2421 */
2422static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
2423{
2424 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
2425 unsigned long stripe_width =
2426 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
3eb08658 2427 int ret;
c9de560d
AT		 2428
2429 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
3eb08658
DE		 2430 ret = sbi->s_stripe;
2431 else if (stripe_width <= sbi->s_blocks_per_group)
2432 ret = stripe_width;
2433 else if (stride <= sbi->s_blocks_per_group)
2434 ret = stride;
2435 else
2436 ret = 0;
c9de560d 2437
3eb08658
DE		 2438 /*
2439 * If the stripe width is 1, this makes no sense and
2440 * we set it to 0 to turn off stripe handling code.
2441 */
2442 if (ret <= 1)
2443 ret = 0;
c9de560d 2444
3eb08658 2445 return ret;
c9de560d 2446}
ac27a0ec 2447
3197ebdb
TT		 2448/* sysfs supprt */
2449
2450struct ext4_attr {
2451 struct attribute attr;
2452 ssize_t (*show)(struct ext4_attr *, struct ext4_sb_info *, char *);
60e6679e 2453 ssize_t (*store)(struct ext4_attr *, struct ext4_sb_info *,
3197ebdb
TT		 2454 const char *, size_t);
2455 int offset;
2456};
2457
2458static int parse_strtoul(const char *buf,
2459 unsigned long max, unsigned long *value)
2460{
2461 char *endp;
2462
e7d2860b
AGR		 2463 *value = simple_strtoul(skip_spaces(buf), &endp, 0);
2464 endp = skip_spaces(endp);
3197ebdb
TT		 2465 if (*endp || *value > max)
2466 return -EINVAL;
2467
2468 return 0;
2469}
2470
2471static ssize_t delayed_allocation_blocks_show(struct ext4_attr *a,
2472 struct ext4_sb_info *sbi,
2473 char *buf)
2474{
2475 return snprintf(buf, PAGE_SIZE, "%llu\n",
7b415bf6
AK		 2476 (s64) EXT4_C2B(sbi,
2477 percpu_counter_sum(&sbi->s_dirtyclusters_counter)));
3197ebdb
TT		 2478}
2479
2480static ssize_t session_write_kbytes_show(struct ext4_attr *a,
2481 struct ext4_sb_info *sbi, char *buf)
2482{
2483 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2484
f613dfcb
TT		 2485 if (!sb->s_bdev->bd_part)
2486 return snprintf(buf, PAGE_SIZE, "0\n");
3197ebdb
TT		 2487 return snprintf(buf, PAGE_SIZE, "%lu\n",
2488 (part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
2489 sbi->s_sectors_written_start) >> 1);
2490}
2491
2492static ssize_t lifetime_write_kbytes_show(struct ext4_attr *a,
2493 struct ext4_sb_info *sbi, char *buf)
2494{
2495 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2496
f613dfcb
TT		 2497 if (!sb->s_bdev->bd_part)
2498 return snprintf(buf, PAGE_SIZE, "0\n");
3197ebdb 2499 return snprintf(buf, PAGE_SIZE, "%llu\n",
a6b43e38 2500 (unsigned long long)(sbi->s_kbytes_written +
3197ebdb 2501 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
a6b43e38 2502 EXT4_SB(sb)->s_sectors_written_start) >> 1)));
3197ebdb
TT		 2503}
2504
77f4135f
VH		 2505static ssize_t extent_cache_hits_show(struct ext4_attr *a,
2506 struct ext4_sb_info *sbi, char *buf)
2507{
2508 return snprintf(buf, PAGE_SIZE, "%lu\n", sbi->extent_cache_hits);
2509}
2510
2511static ssize_t extent_cache_misses_show(struct ext4_attr *a,
2512 struct ext4_sb_info *sbi, char *buf)
2513{
2514 return snprintf(buf, PAGE_SIZE, "%lu\n", sbi->extent_cache_misses);
2515}
2516
3197ebdb
TT		 2517static ssize_t inode_readahead_blks_store(struct ext4_attr *a,
2518 struct ext4_sb_info *sbi,
2519 const char *buf, size_t count)
2520{
2521 unsigned long t;
2522
2523 if (parse_strtoul(buf, 0x40000000, &t))
2524 return -EINVAL;
2525
5dbd571d 2526 if (t && !is_power_of_2(t))
3197ebdb
TT		 2527 return -EINVAL;
2528
2529 sbi->s_inode_readahead_blks = t;
2530 return count;
2531}
2532
2533static ssize_t sbi_ui_show(struct ext4_attr *a,
0b8e58a1 2534 struct ext4_sb_info *sbi, char *buf)
3197ebdb
TT		 2535{
2536 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
2537
2538 return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
2539}
2540
2541static ssize_t sbi_ui_store(struct ext4_attr *a,
2542 struct ext4_sb_info *sbi,
2543 const char *buf, size_t count)
2544{
2545 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
2546 unsigned long t;
2547
2548 if (parse_strtoul(buf, 0xffffffff, &t))
2549 return -EINVAL;
2550 *ui = t;
2551 return count;
2552}
2553
2554#define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \
2555static struct ext4_attr ext4_attr_##_name = { \
2556 .attr = {.name = __stringify(_name), .mode = _mode }, \
2557 .show = _show, \
2558 .store = _store, \
2559 .offset = offsetof(struct ext4_sb_info, _elname), \
2560}
2561#define EXT4_ATTR(name, mode, show, store) \
2562static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store)
2563
857ac889 2564#define EXT4_INFO_ATTR(name) EXT4_ATTR(name, 0444, NULL, NULL)
3197ebdb
TT		 2565#define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL)
2566#define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store)
2567#define EXT4_RW_ATTR_SBI_UI(name, elname) \
2568 EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname)
2569#define ATTR_LIST(name) &ext4_attr_##name.attr
2570
2571EXT4_RO_ATTR(delayed_allocation_blocks);
2572EXT4_RO_ATTR(session_write_kbytes);
2573EXT4_RO_ATTR(lifetime_write_kbytes);
77f4135f
VH		 2574EXT4_RO_ATTR(extent_cache_hits);
2575EXT4_RO_ATTR(extent_cache_misses);
3197ebdb
TT		 2576EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, sbi_ui_show,
2577 inode_readahead_blks_store, s_inode_readahead_blks);
11013911 2578EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal);
3197ebdb
TT		 2579EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats);
2580EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan);
2581EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan);
2582EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs);
2583EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request);
2584EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc);
55138e0b 2585EXT4_RW_ATTR_SBI_UI(max_writeback_mb_bump, s_max_writeback_mb_bump);
3197ebdb
TT		 2586
2587static struct attribute *ext4_attrs[] = {
2588 ATTR_LIST(delayed_allocation_blocks),
2589 ATTR_LIST(session_write_kbytes),
2590 ATTR_LIST(lifetime_write_kbytes),
77f4135f
VH		 2591 ATTR_LIST(extent_cache_hits),
2592 ATTR_LIST(extent_cache_misses),
3197ebdb 2593 ATTR_LIST(inode_readahead_blks),
11013911 2594 ATTR_LIST(inode_goal),
3197ebdb
TT		 2595 ATTR_LIST(mb_stats),
2596 ATTR_LIST(mb_max_to_scan),
2597 ATTR_LIST(mb_min_to_scan),
2598 ATTR_LIST(mb_order2_req),
2599 ATTR_LIST(mb_stream_req),
2600 ATTR_LIST(mb_group_prealloc),
55138e0b 2601 ATTR_LIST(max_writeback_mb_bump),
3197ebdb
TT		 2602 NULL,
2603};
2604
857ac889
LC		 2605/* Features this copy of ext4 supports */
2606EXT4_INFO_ATTR(lazy_itable_init);
27ee40df 2607EXT4_INFO_ATTR(batched_discard);
857ac889
LC		 2608
2609static struct attribute *ext4_feat_attrs[] = {
2610 ATTR_LIST(lazy_itable_init),
27ee40df 2611 ATTR_LIST(batched_discard),
857ac889
LC		 2612 NULL,
2613};
2614
3197ebdb
TT		 2615static ssize_t ext4_attr_show(struct kobject *kobj,
2616 struct attribute *attr, char *buf)
2617{
2618 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2619 s_kobj);
2620 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2621
2622 return a->show ? a->show(a, sbi, buf) : 0;
2623}
2624
2625static ssize_t ext4_attr_store(struct kobject *kobj,
2626 struct attribute *attr,
2627 const char *buf, size_t len)
2628{
2629 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2630 s_kobj);
2631 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2632
2633 return a->store ? a->store(a, sbi, buf, len) : 0;
2634}
2635
2636static void ext4_sb_release(struct kobject *kobj)
2637{
2638 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2639 s_kobj);
2640 complete(&sbi->s_kobj_unregister);
2641}
2642
52cf25d0 2643static const struct sysfs_ops ext4_attr_ops = {
3197ebdb
TT		 2644 .show = ext4_attr_show,
2645 .store = ext4_attr_store,
2646};
2647
2648static struct kobj_type ext4_ktype = {
2649 .default_attrs = ext4_attrs,
2650 .sysfs_ops = &ext4_attr_ops,
2651 .release = ext4_sb_release,
2652};
2653
857ac889
LC		 2654static void ext4_feat_release(struct kobject *kobj)
2655{
2656 complete(&ext4_feat->f_kobj_unregister);
2657}
2658
2659static struct kobj_type ext4_feat_ktype = {
2660 .default_attrs = ext4_feat_attrs,
2661 .sysfs_ops = &ext4_attr_ops,
2662 .release = ext4_feat_release,
2663};
2664
a13fb1a4
ES		 2665/*
2666 * Check whether this filesystem can be mounted based on
2667 * the features present and the RDONLY/RDWR mount requested.
2668 * Returns 1 if this filesystem can be mounted as requested,
2669 * 0 if it cannot be.
2670 */
2671static int ext4_feature_set_ok(struct super_block *sb, int readonly)
2672{
2673 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP)) {
2674 ext4_msg(sb, KERN_ERR,
2675 "Couldn't mount because of "
2676 "unsupported optional features (%x)",
2677 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
2678 ~EXT4_FEATURE_INCOMPAT_SUPP));
2679 return 0;
2680 }
2681
2682 if (readonly)
2683 return 1;
2684
2685 /* Check that feature set is OK for a read-write mount */
2686 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP)) {
2687 ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of "
2688 "unsupported optional features (%x)",
2689 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
2690 ~EXT4_FEATURE_RO_COMPAT_SUPP));
2691 return 0;
2692 }
2693 /*
2694 * Large file size enabled file system can only be mounted
2695 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
2696 */
2697 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) {
2698 if (sizeof(blkcnt_t) < sizeof(u64)) {
2699 ext4_msg(sb, KERN_ERR, "Filesystem with huge files "
2700 "cannot be mounted RDWR without "
2701 "CONFIG_LBDAF");
2702 return 0;
2703 }
2704 }
bab08ab9
TT		 2705 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_BIGALLOC) &&
2706 !EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS)) {
2707 ext4_msg(sb, KERN_ERR,
2708 "Can't support bigalloc feature without "
2709 "extents feature\n");
2710 return 0;
2711 }
a13fb1a4
ES		 2712 return 1;
2713}
2714
66e61a9e
TT		 2715/*
2716 * This function is called once a day if we have errors logged
2717 * on the file system
2718 */
2719static void print_daily_error_info(unsigned long arg)
2720{
2721 struct super_block *sb = (struct super_block *) arg;
2722 struct ext4_sb_info *sbi;
2723 struct ext4_super_block *es;
2724
2725 sbi = EXT4_SB(sb);
2726 es = sbi->s_es;
2727
2728 if (es->s_error_count)
2729 ext4_msg(sb, KERN_NOTICE, "error count: %u",
2730 le32_to_cpu(es->s_error_count));
2731 if (es->s_first_error_time) {
2732 printk(KERN_NOTICE "EXT4-fs (%s): initial error at %u: %.*s:%d",
2733 sb->s_id, le32_to_cpu(es->s_first_error_time),
2734 (int) sizeof(es->s_first_error_func),
2735 es->s_first_error_func,
2736 le32_to_cpu(es->s_first_error_line));
2737 if (es->s_first_error_ino)
2738 printk(": inode %u",
2739 le32_to_cpu(es->s_first_error_ino));
2740 if (es->s_first_error_block)
2741 printk(": block %llu", (unsigned long long)
2742 le64_to_cpu(es->s_first_error_block));
2743 printk("\n");
2744 }
2745 if (es->s_last_error_time) {
2746 printk(KERN_NOTICE "EXT4-fs (%s): last error at %u: %.*s:%d",
2747 sb->s_id, le32_to_cpu(es->s_last_error_time),
2748 (int) sizeof(es->s_last_error_func),
2749 es->s_last_error_func,
2750 le32_to_cpu(es->s_last_error_line));
2751 if (es->s_last_error_ino)
2752 printk(": inode %u",
2753 le32_to_cpu(es->s_last_error_ino));
2754 if (es->s_last_error_block)
2755 printk(": block %llu", (unsigned long long)
2756 le64_to_cpu(es->s_last_error_block));
2757 printk("\n");
2758 }
2759 mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ); /* Once a day */
2760}
2761
bfff6873
LC		 2762/* Find next suitable group and run ext4_init_inode_table */
2763static int ext4_run_li_request(struct ext4_li_request *elr)
2764{
2765 struct ext4_group_desc *gdp = NULL;
2766 ext4_group_t group, ngroups;
2767 struct super_block *sb;
2768 unsigned long timeout = 0;
2769 int ret = 0;
2770
2771 sb = elr->lr_super;
2772 ngroups = EXT4_SB(sb)->s_groups_count;
2773
2774 for (group = elr->lr_next_group; group < ngroups; group++) {
2775 gdp = ext4_get_group_desc(sb, group, NULL);
2776 if (!gdp) {
2777 ret = 1;
2778 break;
2779 }
2780
2781 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2782 break;
2783 }
2784
2785 if (group == ngroups)
2786 ret = 1;
2787
2788 if (!ret) {
2789 timeout = jiffies;
2790 ret = ext4_init_inode_table(sb, group,
2791 elr->lr_timeout ? 0 : 1);
2792 if (elr->lr_timeout == 0) {
51ce6511
LC		 2793 timeout = (jiffies - timeout) *
2794 elr->lr_sbi->s_li_wait_mult;
bfff6873
LC		 2795 elr->lr_timeout = timeout;
2796 }
2797 elr->lr_next_sched = jiffies + elr->lr_timeout;
2798 elr->lr_next_group = group + 1;
2799 }
2800
2801 return ret;
2802}
2803
2804/*
2805 * Remove lr_request from the list_request and free the
4ed5c033 2806 * request structure. Should be called with li_list_mtx held
bfff6873
LC		 2807 */
2808static void ext4_remove_li_request(struct ext4_li_request *elr)
2809{
2810 struct ext4_sb_info *sbi;
2811
2812 if (!elr)
2813 return;
2814
2815 sbi = elr->lr_sbi;
2816
2817 list_del(&elr->lr_request);
2818 sbi->s_li_request = NULL;
2819 kfree(elr);
2820}
2821
2822static void ext4_unregister_li_request(struct super_block *sb)
2823{
1bb933fb
LC		 2824 mutex_lock(&ext4_li_mtx);
2825 if (!ext4_li_info) {
2826 mutex_unlock(&ext4_li_mtx);
bfff6873 2827 return;
1bb933fb 2828 }
bfff6873
LC		 2829
2830 mutex_lock(&ext4_li_info->li_list_mtx);
1bb933fb 2831 ext4_remove_li_request(EXT4_SB(sb)->s_li_request);
bfff6873 2832 mutex_unlock(&ext4_li_info->li_list_mtx);
1bb933fb 2833 mutex_unlock(&ext4_li_mtx);
bfff6873
LC		 2834}
2835
8f1f7453
ES		 2836static struct task_struct *ext4_lazyinit_task;
2837
bfff6873
LC		 2838/*
2839 * This is the function where ext4lazyinit thread lives. It walks
2840 * through the request list searching for next scheduled filesystem.
2841 * When such a fs is found, run the lazy initialization request
2842 * (ext4_rn_li_request) and keep track of the time spend in this
2843 * function. Based on that time we compute next schedule time of
2844 * the request. When walking through the list is complete, compute
2845 * next waking time and put itself into sleep.
2846 */
2847static int ext4_lazyinit_thread(void *arg)
2848{
2849 struct ext4_lazy_init *eli = (struct ext4_lazy_init *)arg;
2850 struct list_head *pos, *n;
2851 struct ext4_li_request *elr;
4ed5c033 2852 unsigned long next_wakeup, cur;
bfff6873
LC		 2853
2854 BUG_ON(NULL == eli);
2855
bfff6873
LC		 2856cont_thread:
2857 while (true) {
2858 next_wakeup = MAX_JIFFY_OFFSET;
2859
2860 mutex_lock(&eli->li_list_mtx);
2861 if (list_empty(&eli->li_request_list)) {
2862 mutex_unlock(&eli->li_list_mtx);
2863 goto exit_thread;
2864 }
2865
2866 list_for_each_safe(pos, n, &eli->li_request_list) {
2867 elr = list_entry(pos, struct ext4_li_request,
2868 lr_request);
2869
b2c78cd0
TT		 2870 if (time_after_eq(jiffies, elr->lr_next_sched)) {
2871 if (ext4_run_li_request(elr) != 0) {
2872 /* error, remove the lazy_init job */
2873 ext4_remove_li_request(elr);
2874 continue;
2875 }
bfff6873
LC		 2876 }
2877
2878 if (time_before(elr->lr_next_sched, next_wakeup))
2879 next_wakeup = elr->lr_next_sched;
2880 }
2881 mutex_unlock(&eli->li_list_mtx);
2882
2883 if (freezing(current))
2884 refrigerator();
2885
4ed5c033
LC		 2886 cur = jiffies;
2887 if ((time_after_eq(cur, next_wakeup)) ||
f4245bd4 2888 (MAX_JIFFY_OFFSET == next_wakeup)) {
bfff6873
LC		 2889 cond_resched();
2890 continue;
2891 }
2892
4ed5c033
LC		 2893 schedule_timeout_interruptible(next_wakeup - cur);
2894
8f1f7453
ES		 2895 if (kthread_should_stop()) {
2896 ext4_clear_request_list();
2897 goto exit_thread;
2898 }
bfff6873
LC		 2899 }
2900
2901exit_thread:
2902 /*
2903 * It looks like the request list is empty, but we need
2904 * to check it under the li_list_mtx lock, to prevent any
2905 * additions into it, and of course we should lock ext4_li_mtx
2906 * to atomically free the list and ext4_li_info, because at
2907 * this point another ext4 filesystem could be registering
2908 * new one.
2909 */
2910 mutex_lock(&ext4_li_mtx);
2911 mutex_lock(&eli->li_list_mtx);
2912 if (!list_empty(&eli->li_request_list)) {
2913 mutex_unlock(&eli->li_list_mtx);
2914 mutex_unlock(&ext4_li_mtx);
2915 goto cont_thread;
2916 }
2917 mutex_unlock(&eli->li_list_mtx);
bfff6873
LC		 2918 kfree(ext4_li_info);
2919 ext4_li_info = NULL;
2920 mutex_unlock(&ext4_li_mtx);
2921
2922 return 0;
2923}
2924
2925static void ext4_clear_request_list(void)
2926{
2927 struct list_head *pos, *n;
2928 struct ext4_li_request *elr;
2929
2930 mutex_lock(&ext4_li_info->li_list_mtx);
bfff6873
LC		 2931 list_for_each_safe(pos, n, &ext4_li_info->li_request_list) {
2932 elr = list_entry(pos, struct ext4_li_request,
2933 lr_request);
2934 ext4_remove_li_request(elr);
2935 }
2936 mutex_unlock(&ext4_li_info->li_list_mtx);
2937}
2938
2939static int ext4_run_lazyinit_thread(void)
2940{
8f1f7453
ES		 2941 ext4_lazyinit_task = kthread_run(ext4_lazyinit_thread,
2942 ext4_li_info, "ext4lazyinit");
2943 if (IS_ERR(ext4_lazyinit_task)) {
2944 int err = PTR_ERR(ext4_lazyinit_task);
bfff6873 2945 ext4_clear_request_list();
bfff6873
LC		 2946 kfree(ext4_li_info);
2947 ext4_li_info = NULL;
2948 printk(KERN_CRIT "EXT4: error %d creating inode table "
2949 "initialization thread\n",
2950 err);
2951 return err;
2952 }
2953 ext4_li_info->li_state |= EXT4_LAZYINIT_RUNNING;
bfff6873
LC		 2954 return 0;
2955}
2956
2957/*
2958 * Check whether it make sense to run itable init. thread or not.
2959 * If there is at least one uninitialized inode table, return
2960 * corresponding group number, else the loop goes through all
2961 * groups and return total number of groups.
2962 */
2963static ext4_group_t ext4_has_uninit_itable(struct super_block *sb)
2964{
2965 ext4_group_t group, ngroups = EXT4_SB(sb)->s_groups_count;
2966 struct ext4_group_desc *gdp = NULL;
2967
2968 for (group = 0; group < ngroups; group++) {
2969 gdp = ext4_get_group_desc(sb, group, NULL);
2970 if (!gdp)
2971 continue;
2972
2973 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2974 break;
2975 }
2976
2977 return group;
2978}
2979
2980static int ext4_li_info_new(void)
2981{
2982 struct ext4_lazy_init *eli = NULL;
2983
2984 eli = kzalloc(sizeof(*eli), GFP_KERNEL);
2985 if (!eli)
2986 return -ENOMEM;
2987
bfff6873
LC		 2988 INIT_LIST_HEAD(&eli->li_request_list);
2989 mutex_init(&eli->li_list_mtx);
2990
bfff6873
LC		 2991 eli->li_state |= EXT4_LAZYINIT_QUIT;
2992
2993 ext4_li_info = eli;
2994
2995 return 0;
2996}
2997
2998static struct ext4_li_request *ext4_li_request_new(struct super_block *sb,
2999 ext4_group_t start)
3000{
3001 struct ext4_sb_info *sbi = EXT4_SB(sb);
3002 struct ext4_li_request *elr;
3003 unsigned long rnd;
3004
3005 elr = kzalloc(sizeof(*elr), GFP_KERNEL);
3006 if (!elr)
3007 return NULL;
3008
3009 elr->lr_super = sb;
3010 elr->lr_sbi = sbi;
3011 elr->lr_next_group = start;
3012
3013 /*
3014 * Randomize first schedule time of the request to
3015 * spread the inode table initialization requests
3016 * better.
3017 */
3018 get_random_bytes(&rnd, sizeof(rnd));
3019 elr->lr_next_sched = jiffies + (unsigned long)rnd %
3020 (EXT4_DEF_LI_MAX_START_DELAY * HZ);
3021
3022 return elr;
3023}
3024
3025static int ext4_register_li_request(struct super_block *sb,
3026 ext4_group_t first_not_zeroed)
3027{
3028 struct ext4_sb_info *sbi = EXT4_SB(sb);
3029 struct ext4_li_request *elr;
3030 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
6c5a6cb9 3031 int ret = 0;
bfff6873 3032
51ce6511
LC		 3033 if (sbi->s_li_request != NULL) {
3034 /*
3035 * Reset timeout so it can be computed again, because
3036 * s_li_wait_mult might have changed.
3037 */
3038 sbi->s_li_request->lr_timeout = 0;
beed5ecb 3039 return 0;
51ce6511 3040 }
bfff6873
LC		 3041
3042 if (first_not_zeroed == ngroups ||
3043 (sb->s_flags & MS_RDONLY) ||
55ff3840 3044 !test_opt(sb, INIT_INODE_TABLE))
beed5ecb 3045 return 0;
bfff6873
LC		 3046
3047 elr = ext4_li_request_new(sb, first_not_zeroed);
beed5ecb
NK		 3048 if (!elr)
3049 return -ENOMEM;
bfff6873
LC		 3050
3051 mutex_lock(&ext4_li_mtx);
3052
3053 if (NULL == ext4_li_info) {
3054 ret = ext4_li_info_new();
3055 if (ret)
3056 goto out;
3057 }
3058
3059 mutex_lock(&ext4_li_info->li_list_mtx);
3060 list_add(&elr->lr_request, &ext4_li_info->li_request_list);
3061 mutex_unlock(&ext4_li_info->li_list_mtx);
3062
3063 sbi->s_li_request = elr;
46e4690b
TM		 3064 /*
3065 * set elr to NULL here since it has been inserted to
3066 * the request_list and the removal and free of it is
3067 * handled by ext4_clear_request_list from now on.
3068 */
3069 elr = NULL;
bfff6873
LC		 3070
3071 if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) {
3072 ret = ext4_run_lazyinit_thread();
3073 if (ret)
3074 goto out;
3075 }
bfff6873 3076out:
beed5ecb
NK		 3077 mutex_unlock(&ext4_li_mtx);
3078 if (ret)
bfff6873 3079 kfree(elr);
bfff6873
LC		 3080 return ret;
3081}
3082
3083/*
3084 * We do not need to lock anything since this is called on
3085 * module unload.
3086 */
3087static void ext4_destroy_lazyinit_thread(void)
3088{
3089 /*
3090 * If thread exited earlier
3091 * there's nothing to be done.
3092 */
8f1f7453 3093 if (!ext4_li_info || !ext4_lazyinit_task)
bfff6873
LC		 3094 return;
3095
8f1f7453 3096 kthread_stop(ext4_lazyinit_task);
bfff6873
LC		 3097}
3098
2b2d6d01 3099static int ext4_fill_super(struct super_block *sb, void *data, int silent)
7477827f
AK		 3100 __releases(kernel_lock)
3101 __acquires(kernel_lock)
ac27a0ec 3102{
d4c402d9 3103 char *orig_data = kstrdup(data, GFP_KERNEL);
2b2d6d01 3104 struct buffer_head *bh;
617ba13b
MC		 3105 struct ext4_super_block *es = NULL;
3106 struct ext4_sb_info *sbi;
3107 ext4_fsblk_t block;
3108 ext4_fsblk_t sb_block = get_sb_block(&data);
70bbb3e0 3109 ext4_fsblk_t logical_sb_block;
ac27a0ec 3110 unsigned long offset = 0;
ac27a0ec
DK		 3111 unsigned long journal_devnum = 0;
3112 unsigned long def_mount_opts;
3113 struct inode *root;
9f6200bb 3114 char *cp;
0390131b 3115 const char *descr;
dcc7dae3 3116 int ret = -ENOMEM;
281b5995 3117 int blocksize, clustersize;
4ec11028
TT		 3118 unsigned int db_count;
3119 unsigned int i;
281b5995 3120 int needs_recovery, has_huge_files, has_bigalloc;
bd81d8ee 3121 __u64 blocks_count;
833f4077 3122 int err;
b3881f74 3123 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
bfff6873 3124 ext4_group_t first_not_zeroed;
ac27a0ec
DK		 3125
3126 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
3127 if (!sbi)
dcc7dae3 3128 goto out_free_orig;
705895b6
PE		 3129
3130 sbi->s_blockgroup_lock =
3131 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
3132 if (!sbi->s_blockgroup_lock) {
3133 kfree(sbi);
dcc7dae3 3134 goto out_free_orig;
705895b6 3135 }
ac27a0ec
DK		 3136 sb->s_fs_info = sbi;
3137 sbi->s_mount_opt = 0;
617ba13b
MC		 3138 sbi->s_resuid = EXT4_DEF_RESUID;
3139 sbi->s_resgid = EXT4_DEF_RESGID;
240799cd 3140 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
d9c9bef1 3141 sbi->s_sb_block = sb_block;
f613dfcb
TT		 3142 if (sb->s_bdev->bd_part)
3143 sbi->s_sectors_written_start =
3144 part_stat_read(sb->s_bdev->bd_part, sectors[1]);
ac27a0ec 3145
9f6200bb
TT		 3146 /* Cleanup superblock name */
3147 for (cp = sb->s_id; (cp = strchr(cp, '/'));)
3148 *cp = '!';
3149
dcc7dae3 3150 ret = -EINVAL;
617ba13b 3151 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
ac27a0ec 3152 if (!blocksize) {
b31e1552 3153 ext4_msg(sb, KERN_ERR, "unable to set blocksize");
ac27a0ec
DK		 3154 goto out_fail;
3155 }
3156
3157 /*
617ba13b 3158 * The ext4 superblock will not be buffer aligned for other than 1kB
ac27a0ec
DK		 3159 * block sizes. We need to calculate the offset from buffer start.
3160 */
617ba13b 3161 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
70bbb3e0
AM		 3162 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3163 offset = do_div(logical_sb_block, blocksize);
ac27a0ec 3164 } else {
70bbb3e0 3165 logical_sb_block = sb_block;
ac27a0ec
DK		 3166 }
3167
70bbb3e0 3168 if (!(bh = sb_bread(sb, logical_sb_block))) {
b31e1552 3169 ext4_msg(sb, KERN_ERR, "unable to read superblock");
ac27a0ec
DK		 3170 goto out_fail;
3171 }
3172 /*
3173 * Note: s_es must be initialized as soon as possible because
617ba13b 3174 * some ext4 macro-instructions depend on its value
ac27a0ec 3175 */
617ba13b 3176 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
ac27a0ec
DK		 3177 sbi->s_es = es;
3178 sb->s_magic = le16_to_cpu(es->s_magic);
617ba13b
MC		 3179 if (sb->s_magic != EXT4_SUPER_MAGIC)
3180 goto cantfind_ext4;
afc32f7e 3181 sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
ac27a0ec
DK		 3182
3183 /* Set defaults before we parse the mount options */
3184 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
fd8c37ec 3185 set_opt(sb, INIT_INODE_TABLE);
617ba13b 3186 if (def_mount_opts & EXT4_DEFM_DEBUG)
fd8c37ec 3187 set_opt(sb, DEBUG);
437ca0fd
DM		 3188 if (def_mount_opts & EXT4_DEFM_BSDGROUPS) {
3189 ext4_msg(sb, KERN_WARNING, deprecated_msg, "bsdgroups",
3190 "2.6.38");
fd8c37ec 3191 set_opt(sb, GRPID);
437ca0fd 3192 }
617ba13b 3193 if (def_mount_opts & EXT4_DEFM_UID16)
fd8c37ec 3194 set_opt(sb, NO_UID32);
ea663336 3195 /* xattr user namespace & acls are now defaulted on */
03010a33 3196#ifdef CONFIG_EXT4_FS_XATTR
ea663336 3197 set_opt(sb, XATTR_USER);
2e7842b8 3198#endif
03010a33 3199#ifdef CONFIG_EXT4_FS_POSIX_ACL
ea663336 3200 set_opt(sb, POSIX_ACL);
2e7842b8 3201#endif
6fd7a467 3202 set_opt(sb, MBLK_IO_SUBMIT);
617ba13b 3203 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
fd8c37ec 3204 set_opt(sb, JOURNAL_DATA);
617ba13b 3205 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
fd8c37ec 3206 set_opt(sb, ORDERED_DATA);
617ba13b 3207 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
fd8c37ec 3208 set_opt(sb, WRITEBACK_DATA);
617ba13b
MC		 3209
3210 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
fd8c37ec 3211 set_opt(sb, ERRORS_PANIC);
bb4f397a 3212 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
fd8c37ec 3213 set_opt(sb, ERRORS_CONT);
bb4f397a 3214 else
fd8c37ec 3215 set_opt(sb, ERRORS_RO);
8b67f04a 3216 if (def_mount_opts & EXT4_DEFM_BLOCK_VALIDITY)
fd8c37ec 3217 set_opt(sb, BLOCK_VALIDITY);
8b67f04a 3218 if (def_mount_opts & EXT4_DEFM_DISCARD)
fd8c37ec 3219 set_opt(sb, DISCARD);
ac27a0ec
DK		 3220
3221 sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
3222 sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
30773840
TT		 3223 sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
3224 sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
3225 sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
ac27a0ec 3226
8b67f04a 3227 if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0)
fd8c37ec 3228 set_opt(sb, BARRIER);
ac27a0ec 3229
dd919b98
AK		 3230 /*
3231 * enable delayed allocation by default
3232 * Use -o nodelalloc to turn it off
3233 */
8b67f04a
TT		 3234 if (!IS_EXT3_SB(sb) &&
3235 ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0))
fd8c37ec 3236 set_opt(sb, DELALLOC);
dd919b98 3237
51ce6511
LC		 3238 /*
3239 * set default s_li_wait_mult for lazyinit, for the case there is
3240 * no mount option specified.
3241 */
3242 sbi->s_li_wait_mult = EXT4_DEF_LI_WAIT_MULT;
3243
8b67f04a
TT		 3244 if (!parse_options((char *) sbi->s_es->s_mount_opts, sb,
3245 &journal_devnum, &journal_ioprio, NULL, 0)) {
3246 ext4_msg(sb, KERN_WARNING,
3247 "failed to parse options in superblock: %s",
3248 sbi->s_es->s_mount_opts);
3249 }
b3881f74
TT		 3250 if (!parse_options((char *) data, sb, &journal_devnum,
3251 &journal_ioprio, NULL, 0))
ac27a0ec
DK		 3252 goto failed_mount;
3253
56889787
TT		 3254 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
3255 printk_once(KERN_WARNING "EXT4-fs: Warning: mounting "
3256 "with data=journal disables delayed "
3257 "allocation and O_DIRECT support!\n");
3258 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
3259 ext4_msg(sb, KERN_ERR, "can't mount with "
3260 "both data=journal and delalloc");
3261 goto failed_mount;
3262 }
3263 if (test_opt(sb, DIOREAD_NOLOCK)) {
3264 ext4_msg(sb, KERN_ERR, "can't mount with "
3265 "both data=journal and delalloc");
3266 goto failed_mount;
3267 }
3268 if (test_opt(sb, DELALLOC))
3269 clear_opt(sb, DELALLOC);
3270 }
3271
3272 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
3273 if (test_opt(sb, DIOREAD_NOLOCK)) {
3274 if (blocksize < PAGE_SIZE) {
3275 ext4_msg(sb, KERN_ERR, "can't mount with "
3276 "dioread_nolock if block size != PAGE_SIZE");
3277 goto failed_mount;
3278 }
3279 }
3280
ac27a0ec 3281 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
482a7425 3282 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec 3283
617ba13b
MC		 3284 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
3285 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
3286 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
3287 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
b31e1552
ES		 3288 ext4_msg(sb, KERN_WARNING,
3289 "feature flags set on rev 0 fs, "
3290 "running e2fsck is recommended");
469108ff 3291
2035e776
TT		 3292 if (IS_EXT2_SB(sb)) {
3293 if (ext2_feature_set_ok(sb))
3294 ext4_msg(sb, KERN_INFO, "mounting ext2 file system "
3295 "using the ext4 subsystem");
3296 else {
3297 ext4_msg(sb, KERN_ERR, "couldn't mount as ext2 due "
3298 "to feature incompatibilities");
3299 goto failed_mount;
3300 }
3301 }
3302
3303 if (IS_EXT3_SB(sb)) {
3304 if (ext3_feature_set_ok(sb))
3305 ext4_msg(sb, KERN_INFO, "mounting ext3 file system "
3306 "using the ext4 subsystem");
3307 else {
3308 ext4_msg(sb, KERN_ERR, "couldn't mount as ext3 due "
3309 "to feature incompatibilities");
3310 goto failed_mount;
3311 }
3312 }
3313
ac27a0ec
DK		 3314 /*
3315 * Check feature flags regardless of the revision level, since we
3316 * previously didn't change the revision level when setting the flags,
3317 * so there is a chance incompat flags are set on a rev 0 filesystem.
3318 */
a13fb1a4 3319 if (!ext4_feature_set_ok(sb, (sb->s_flags & MS_RDONLY)))
ac27a0ec 3320 goto failed_mount;
a13fb1a4 3321
617ba13b
MC		 3322 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
3323 blocksize > EXT4_MAX_BLOCK_SIZE) {
b31e1552
ES		 3324 ext4_msg(sb, KERN_ERR,
3325 "Unsupported filesystem blocksize %d", blocksize);
ac27a0ec
DK		 3326 goto failed_mount;
3327 }
3328
ac27a0ec 3329 if (sb->s_blocksize != blocksize) {
ce40733c
AK		 3330 /* Validate the filesystem blocksize */
3331 if (!sb_set_blocksize(sb, blocksize)) {
b31e1552 3332 ext4_msg(sb, KERN_ERR, "bad block size %d",
ce40733c 3333 blocksize);
ac27a0ec
DK		 3334 goto failed_mount;
3335 }
3336
2b2d6d01 3337 brelse(bh);
70bbb3e0
AM		 3338 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3339 offset = do_div(logical_sb_block, blocksize);
3340 bh = sb_bread(sb, logical_sb_block);
ac27a0ec 3341 if (!bh) {
b31e1552
ES		 3342 ext4_msg(sb, KERN_ERR,
3343 "Can't read superblock on 2nd try");
ac27a0ec
DK		 3344 goto failed_mount;
3345 }
617ba13b 3346 es = (struct ext4_super_block *)(((char *)bh->b_data) + offset);
ac27a0ec 3347 sbi->s_es = es;
617ba13b 3348 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
b31e1552
ES		 3349 ext4_msg(sb, KERN_ERR,
3350 "Magic mismatch, very weird!");
ac27a0ec
DK		 3351 goto failed_mount;
3352 }
3353 }
3354
a13fb1a4
ES		 3355 has_huge_files = EXT4_HAS_RO_COMPAT_FEATURE(sb,
3356 EXT4_FEATURE_RO_COMPAT_HUGE_FILE);
f287a1a5
TT		 3357 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
3358 has_huge_files);
3359 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
ac27a0ec 3360
617ba13b
MC		 3361 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
3362 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
3363 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
ac27a0ec
DK		 3364 } else {
3365 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
3366 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
617ba13b 3367 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
1330593e 3368 (!is_power_of_2(sbi->s_inode_size)) ||
ac27a0ec 3369 (sbi->s_inode_size > blocksize)) {
b31e1552
ES		 3370 ext4_msg(sb, KERN_ERR,
3371 "unsupported inode size: %d",
2b2d6d01 3372 sbi->s_inode_size);
ac27a0ec
DK		 3373 goto failed_mount;
3374 }
ef7f3835
KS		 3375 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
3376 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
ac27a0ec 3377 }
0b8e58a1 3378
0d1ee42f
AR		 3379 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
3380 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
8fadc143 3381 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
0d1ee42f 3382 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
d8ea6cf8 3383 !is_power_of_2(sbi->s_desc_size)) {
b31e1552
ES		 3384 ext4_msg(sb, KERN_ERR,
3385 "unsupported descriptor size %lu",
0d1ee42f
AR		 3386 sbi->s_desc_size);
3387 goto failed_mount;
3388 }
3389 } else
3390 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
0b8e58a1 3391
ac27a0ec 3392 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
ac27a0ec 3393 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
b47b6f38 3394 if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
617ba13b 3395 goto cantfind_ext4;
0b8e58a1 3396
617ba13b 3397 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
ac27a0ec 3398 if (sbi->s_inodes_per_block == 0)
617ba13b 3399 goto cantfind_ext4;
ac27a0ec
DK		 3400 sbi->s_itb_per_group = sbi->s_inodes_per_group /
3401 sbi->s_inodes_per_block;
0d1ee42f 3402 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
ac27a0ec
DK		 3403 sbi->s_sbh = bh;
3404 sbi->s_mount_state = le16_to_cpu(es->s_state);
e57aa839
FW		 3405 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
3406 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
0b8e58a1 3407
2b2d6d01 3408 for (i = 0; i < 4; i++)
ac27a0ec
DK		 3409 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
3410 sbi->s_def_hash_version = es->s_def_hash_version;
f99b2589
TT		 3411 i = le32_to_cpu(es->s_flags);
3412 if (i & EXT2_FLAGS_UNSIGNED_HASH)
3413 sbi->s_hash_unsigned = 3;
3414 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
3415#ifdef __CHAR_UNSIGNED__
3416 es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
3417 sbi->s_hash_unsigned = 3;
3418#else
3419 es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
3420#endif
3421 sb->s_dirt = 1;
3422 }
ac27a0ec 3423
281b5995
TT		 3424 /* Handle clustersize */
3425 clustersize = BLOCK_SIZE << le32_to_cpu(es->s_log_cluster_size);
3426 has_bigalloc = EXT4_HAS_RO_COMPAT_FEATURE(sb,
3427 EXT4_FEATURE_RO_COMPAT_BIGALLOC);
3428 if (has_bigalloc) {
3429 if (clustersize < blocksize) {
3430 ext4_msg(sb, KERN_ERR,
3431 "cluster size (%d) smaller than "
3432 "block size (%d)", clustersize, blocksize);
3433 goto failed_mount;
3434 }
3435 sbi->s_cluster_bits = le32_to_cpu(es->s_log_cluster_size) -
3436 le32_to_cpu(es->s_log_block_size);
3437 sbi->s_clusters_per_group =
3438 le32_to_cpu(es->s_clusters_per_group);
3439 if (sbi->s_clusters_per_group > blocksize * 8) {
3440 ext4_msg(sb, KERN_ERR,
3441 "#clusters per group too big: %lu",
3442 sbi->s_clusters_per_group);
3443 goto failed_mount;
3444 }
3445 if (sbi->s_blocks_per_group !=
3446 (sbi->s_clusters_per_group * (clustersize / blocksize))) {
3447 ext4_msg(sb, KERN_ERR, "blocks per group (%lu) and "
3448 "clusters per group (%lu) inconsistent",
3449 sbi->s_blocks_per_group,
3450 sbi->s_clusters_per_group);
3451 goto failed_mount;
3452 }
3453 } else {
3454 if (clustersize != blocksize) {
3455 ext4_warning(sb, "fragment/cluster size (%d) != "
3456 "block size (%d)", clustersize,
3457 blocksize);
3458 clustersize = blocksize;
3459 }
3460 if (sbi->s_blocks_per_group > blocksize * 8) {
3461 ext4_msg(sb, KERN_ERR,
3462 "#blocks per group too big: %lu",
3463 sbi->s_blocks_per_group);
3464 goto failed_mount;
3465 }
3466 sbi->s_clusters_per_group = sbi->s_blocks_per_group;
3467 sbi->s_cluster_bits = 0;
ac27a0ec 3468 }
281b5995
TT		 3469 sbi->s_cluster_ratio = clustersize / blocksize;
3470
ac27a0ec 3471 if (sbi->s_inodes_per_group > blocksize * 8) {
b31e1552
ES		 3472 ext4_msg(sb, KERN_ERR,
3473 "#inodes per group too big: %lu",
2b2d6d01 3474 sbi->s_inodes_per_group);
ac27a0ec
DK		 3475 goto failed_mount;
3476 }
3477
bf43d84b
ES		 3478 /*
3479 * Test whether we have more sectors than will fit in sector_t,
3480 * and whether the max offset is addressable by the page cache.
3481 */
5a9ae68a 3482 err = generic_check_addressable(sb->s_blocksize_bits,
30ca22c7 3483 ext4_blocks_count(es));
5a9ae68a 3484 if (err) {
b31e1552 3485 ext4_msg(sb, KERN_ERR, "filesystem"
bf43d84b 3486 " too large to mount safely on this system");
ac27a0ec 3487 if (sizeof(sector_t) < 8)
90c699a9 3488 ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled");
5a9ae68a 3489 ret = err;
ac27a0ec
DK		 3490 goto failed_mount;
3491 }
3492
617ba13b
MC		 3493 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
3494 goto cantfind_ext4;
e7c95593 3495
0f2ddca6
FTN		 3496 /* check blocks count against device size */
3497 blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
3498 if (blocks_count && ext4_blocks_count(es) > blocks_count) {
b31e1552
ES		 3499 ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
3500 "exceeds size of device (%llu blocks)",
0f2ddca6
FTN		 3501 ext4_blocks_count(es), blocks_count);
3502 goto failed_mount;
3503 }
3504
0b8e58a1
AD		 3505 /*
3506 * It makes no sense for the first data block to be beyond the end
3507 * of the filesystem.
3508 */
3509 if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
b31e1552
ES		 3510 ext4_msg(sb, KERN_WARNING, "bad geometry: first data"
3511 "block %u is beyond end of filesystem (%llu)",
3512 le32_to_cpu(es->s_first_data_block),
3513 ext4_blocks_count(es));
e7c95593
ES		 3514 goto failed_mount;
3515 }
bd81d8ee
LV		 3516 blocks_count = (ext4_blocks_count(es) -
3517 le32_to_cpu(es->s_first_data_block) +
3518 EXT4_BLOCKS_PER_GROUP(sb) - 1);
3519 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
4ec11028 3520 if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
b31e1552 3521 ext4_msg(sb, KERN_WARNING, "groups count too large: %u "
4ec11028 3522 "(block count %llu, first data block %u, "
b31e1552 3523 "blocks per group %lu)", sbi->s_groups_count,
4ec11028
TT		 3524 ext4_blocks_count(es),
3525 le32_to_cpu(es->s_first_data_block),
3526 EXT4_BLOCKS_PER_GROUP(sb));
3527 goto failed_mount;
3528 }
bd81d8ee 3529 sbi->s_groups_count = blocks_count;
fb0a387d
ES		 3530 sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
3531 (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
617ba13b
MC		 3532 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
3533 EXT4_DESC_PER_BLOCK(sb);
f18a5f21
TT		 3534 sbi->s_group_desc = ext4_kvmalloc(db_count *
3535 sizeof(struct buffer_head *),
3536 GFP_KERNEL);
ac27a0ec 3537 if (sbi->s_group_desc == NULL) {
b31e1552 3538 ext4_msg(sb, KERN_ERR, "not enough memory");
ac27a0ec
DK		 3539 goto failed_mount;
3540 }
3541
3244fcb1 3542#ifdef CONFIG_PROC_FS
9f6200bb
TT		 3543 if (ext4_proc_root)
3544 sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);
3244fcb1 3545#endif
240799cd 3546
705895b6 3547 bgl_lock_init(sbi->s_blockgroup_lock);
ac27a0ec
DK		 3548
3549 for (i = 0; i < db_count; i++) {
70bbb3e0 3550 block = descriptor_loc(sb, logical_sb_block, i);
ac27a0ec
DK		 3551 sbi->s_group_desc[i] = sb_bread(sb, block);
3552 if (!sbi->s_group_desc[i]) {
b31e1552
ES		 3553 ext4_msg(sb, KERN_ERR,
3554 "can't read group descriptor %d", i);
ac27a0ec
DK		 3555 db_count = i;
3556 goto failed_mount2;
3557 }
3558 }
bfff6873 3559 if (!ext4_check_descriptors(sb, &first_not_zeroed)) {
b31e1552 3560 ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
ac27a0ec
DK		 3561 goto failed_mount2;
3562 }
772cb7c8
JS		 3563 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
3564 if (!ext4_fill_flex_info(sb)) {
b31e1552
ES		 3565 ext4_msg(sb, KERN_ERR,
3566 "unable to initialize "
3567 "flex_bg meta info!");
772cb7c8
JS		 3568 goto failed_mount2;
3569 }
3570
ac27a0ec
DK		 3571 sbi->s_gdb_count = db_count;
3572 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
3573 spin_lock_init(&sbi->s_next_gen_lock);
3574
04496411
TM		 3575 init_timer(&sbi->s_err_report);
3576 sbi->s_err_report.function = print_daily_error_info;
3577 sbi->s_err_report.data = (unsigned long) sb;
3578
57042651 3579 err = percpu_counter_init(&sbi->s_freeclusters_counter,
ce7e010a
TT		 3580 ext4_count_free_blocks(sb));
3581 if (!err) {
3582 err = percpu_counter_init(&sbi->s_freeinodes_counter,
3583 ext4_count_free_inodes(sb));
3584 }
3585 if (!err) {
3586 err = percpu_counter_init(&sbi->s_dirs_counter,
3587 ext4_count_dirs(sb));
3588 }
3589 if (!err) {
57042651 3590 err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0);
ce7e010a
TT		 3591 }
3592 if (err) {
3593 ext4_msg(sb, KERN_ERR, "insufficient memory");
3594 goto failed_mount3;
3595 }
3596
c9de560d 3597 sbi->s_stripe = ext4_get_stripe_size(sbi);
55138e0b 3598 sbi->s_max_writeback_mb_bump = 128;
c9de560d 3599
ac27a0ec
DK		 3600 /*
3601 * set up enough so that it can read an inode
3602 */
9ca92389
TT		 3603 if (!test_opt(sb, NOLOAD) &&
3604 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
3605 sb->s_op = &ext4_sops;
3606 else
3607 sb->s_op = &ext4_nojournal_sops;
617ba13b
MC		 3608 sb->s_export_op = &ext4_export_ops;
3609 sb->s_xattr = ext4_xattr_handlers;
ac27a0ec 3610#ifdef CONFIG_QUOTA
617ba13b
MC		 3611 sb->s_qcop = &ext4_qctl_operations;
3612 sb->dq_op = &ext4_quota_operations;
ac27a0ec 3613#endif
f2fa2ffc
AK		 3614 memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
3615
ac27a0ec 3616 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
3b9d4ed2 3617 mutex_init(&sbi->s_orphan_lock);
8f82f840 3618 sbi->s_resize_flags = 0;
ac27a0ec
DK		 3619
3620 sb->s_root = NULL;
3621
3622 needs_recovery = (es->s_last_orphan != 0 ||
617ba13b
MC		 3623 EXT4_HAS_INCOMPAT_FEATURE(sb,
3624 EXT4_FEATURE_INCOMPAT_RECOVER));
ac27a0ec 3625
c5e06d10
JL		 3626 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_MMP) &&
3627 !(sb->s_flags & MS_RDONLY))
3628 if (ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block)))
3629 goto failed_mount3;
3630
ac27a0ec
DK		 3631 /*
3632 * The first inode we look at is the journal inode. Don't try
3633 * root first: it may be modified in the journal!
3634 */
3635 if (!test_opt(sb, NOLOAD) &&
617ba13b
MC		 3636 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
3637 if (ext4_load_journal(sb, es, journal_devnum))
ac27a0ec 3638 goto failed_mount3;
0390131b
FM		 3639 } else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) &&
3640 EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
b31e1552
ES		 3641 ext4_msg(sb, KERN_ERR, "required journal recovery "
3642 "suppressed and not mounted read-only");
744692dc 3643 goto failed_mount_wq;
ac27a0ec 3644 } else {
fd8c37ec 3645 clear_opt(sb, DATA_FLAGS);
0390131b
FM		 3646 sbi->s_journal = NULL;
3647 needs_recovery = 0;
3648 goto no_journal;
ac27a0ec
DK		 3649 }
3650
eb40a09c
JS		 3651 if (ext4_blocks_count(es) > 0xffffffffULL &&
3652 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
3653 JBD2_FEATURE_INCOMPAT_64BIT)) {
b31e1552 3654 ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
744692dc 3655 goto failed_mount_wq;
eb40a09c
JS		 3656 }
3657
d4da6c9c
LT		 3658 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
3659 jbd2_journal_set_features(sbi->s_journal,
3660 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
818d276c 3661 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
d4da6c9c
LT		 3662 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
3663 jbd2_journal_set_features(sbi->s_journal,
3664 JBD2_FEATURE_COMPAT_CHECKSUM, 0, 0);
818d276c
GS		 3665 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
3666 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
d4da6c9c
LT		 3667 } else {
3668 jbd2_journal_clear_features(sbi->s_journal,
3669 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
3670 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
3671 }
818d276c 3672
ac27a0ec
DK		 3673 /* We have now updated the journal if required, so we can
3674 * validate the data journaling mode. */
3675 switch (test_opt(sb, DATA_FLAGS)) {
3676 case 0:
3677 /* No mode set, assume a default based on the journal
63f57933
AM		 3678 * capabilities: ORDERED_DATA if the journal can
3679 * cope, else JOURNAL_DATA
3680 */
dab291af
MC		 3681 if (jbd2_journal_check_available_features
3682 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
fd8c37ec 3683 set_opt(sb, ORDERED_DATA);
ac27a0ec 3684 else
fd8c37ec 3685 set_opt(sb, JOURNAL_DATA);
ac27a0ec
DK		 3686 break;
3687
617ba13b
MC		 3688 case EXT4_MOUNT_ORDERED_DATA:
3689 case EXT4_MOUNT_WRITEBACK_DATA:
dab291af
MC		 3690 if (!jbd2_journal_check_available_features
3691 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
b31e1552
ES		 3692 ext4_msg(sb, KERN_ERR, "Journal does not support "
3693 "requested data journaling mode");
744692dc 3694 goto failed_mount_wq;
ac27a0ec
DK		 3695 }
3696 default:
3697 break;
3698 }
b3881f74 3699 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
ac27a0ec 3700
ce7e010a
TT		 3701 /*
3702 * The journal may have updated the bg summary counts, so we
3703 * need to update the global counters.
3704 */
57042651 3705 percpu_counter_set(&sbi->s_freeclusters_counter,
ce7e010a
TT		 3706 ext4_count_free_blocks(sb));
3707 percpu_counter_set(&sbi->s_freeinodes_counter,
3708 ext4_count_free_inodes(sb));
3709 percpu_counter_set(&sbi->s_dirs_counter,
3710 ext4_count_dirs(sb));
57042651 3711 percpu_counter_set(&sbi->s_dirtyclusters_counter, 0);
206f7ab4 3712
ce7e010a 3713no_journal:
fd89d5f2
TH		 3714 /*
3715 * The maximum number of concurrent works can be high and
3716 * concurrency isn't really necessary. Limit it to 1.
3717 */
3718 EXT4_SB(sb)->dio_unwritten_wq =
ae005cbe 3719 alloc_workqueue("ext4-dio-unwritten", WQ_MEM_RECLAIM | WQ_UNBOUND, 1);
4c0425ff
MC		 3720 if (!EXT4_SB(sb)->dio_unwritten_wq) {
3721 printk(KERN_ERR "EXT4-fs: failed to create DIO workqueue\n");
3722 goto failed_mount_wq;
3723 }
3724
ac27a0ec 3725 /*
dab291af 3726 * The jbd2_journal_load will have done any necessary log recovery,
ac27a0ec
DK		 3727 * so we can safely mount the rest of the filesystem now.
3728 */
3729
1d1fe1ee
DH		 3730 root = ext4_iget(sb, EXT4_ROOT_INO);
3731 if (IS_ERR(root)) {
b31e1552 3732 ext4_msg(sb, KERN_ERR, "get root inode failed");
1d1fe1ee 3733 ret = PTR_ERR(root);
32a9bb57 3734 root = NULL;
ac27a0ec
DK		 3735 goto failed_mount4;
3736 }
3737 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
b31e1552 3738 ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
ac27a0ec
DK		 3739 goto failed_mount4;
3740 }
1d1fe1ee
DH		 3741 sb->s_root = d_alloc_root(root);
3742 if (!sb->s_root) {
b31e1552 3743 ext4_msg(sb, KERN_ERR, "get root dentry failed");
1d1fe1ee
DH		 3744 ret = -ENOMEM;
3745 goto failed_mount4;
3746 }
ac27a0ec 3747
2b2d6d01 3748 ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY);
ef7f3835
KS		 3749
3750 /* determine the minimum size of new large inodes, if present */
3751 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
3752 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
3753 EXT4_GOOD_OLD_INODE_SIZE;
3754 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3755 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) {
3756 if (sbi->s_want_extra_isize <
3757 le16_to_cpu(es->s_want_extra_isize))
3758 sbi->s_want_extra_isize =
3759 le16_to_cpu(es->s_want_extra_isize);
3760 if (sbi->s_want_extra_isize <
3761 le16_to_cpu(es->s_min_extra_isize))
3762 sbi->s_want_extra_isize =
3763 le16_to_cpu(es->s_min_extra_isize);
3764 }
3765 }
3766 /* Check if enough inode space is available */
3767 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
3768 sbi->s_inode_size) {
3769 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
3770 EXT4_GOOD_OLD_INODE_SIZE;
b31e1552
ES		 3771 ext4_msg(sb, KERN_INFO, "required extra inode space not"
3772 "available");
ef7f3835
KS		 3773 }
3774
6fd058f7
TT		 3775 err = ext4_setup_system_zone(sb);
3776 if (err) {
b31e1552 3777 ext4_msg(sb, KERN_ERR, "failed to initialize system "
fbe845dd 3778 "zone (%d)", err);
6fd058f7
TT		 3779 goto failed_mount4;
3780 }
3781
c2774d84
AK		 3782 ext4_ext_init(sb);
3783 err = ext4_mb_init(sb, needs_recovery);
3784 if (err) {
421f91d2 3785 ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)",
b31e1552 3786 err);
c2774d84
AK		 3787 goto failed_mount4;
3788 }
3789
bfff6873
LC		 3790 err = ext4_register_li_request(sb, first_not_zeroed);
3791 if (err)
3792 goto failed_mount4;
3793
3197ebdb
TT		 3794 sbi->s_kobj.kset = ext4_kset;
3795 init_completion(&sbi->s_kobj_unregister);
3796 err = kobject_init_and_add(&sbi->s_kobj, &ext4_ktype, NULL,
3797 "%s", sb->s_id);
3798 if (err) {
3799 ext4_mb_release(sb);
3800 ext4_ext_release(sb);
3801 goto failed_mount4;
3802 };
3803
617ba13b
MC		 3804 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
3805 ext4_orphan_cleanup(sb, es);
3806 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
0390131b 3807 if (needs_recovery) {
b31e1552 3808 ext4_msg(sb, KERN_INFO, "recovery complete");
0390131b
FM		 3809 ext4_mark_recovery_complete(sb, es);
3810 }
3811 if (EXT4_SB(sb)->s_journal) {
3812 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
3813 descr = " journalled data mode";
3814 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
3815 descr = " ordered data mode";
3816 else
3817 descr = " writeback data mode";
3818 } else
3819 descr = "out journal";
3820
d4c402d9 3821 ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. "
8b67f04a
TT		 3822 "Opts: %s%s%s", descr, sbi->s_es->s_mount_opts,
3823 *sbi->s_es->s_mount_opts ? "; " : "", orig_data);
ac27a0ec 3824
66e61a9e
TT		 3825 if (es->s_error_count)
3826 mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */
ac27a0ec 3827
d4c402d9 3828 kfree(orig_data);
ac27a0ec
DK		 3829 return 0;
3830
617ba13b 3831cantfind_ext4:
ac27a0ec 3832 if (!silent)
b31e1552 3833 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
ac27a0ec
DK		 3834 goto failed_mount;
3835
3836failed_mount4:
32a9bb57
MK		 3837 iput(root);
3838 sb->s_root = NULL;
b31e1552 3839 ext4_msg(sb, KERN_ERR, "mount failed");
4c0425ff
MC		 3840 destroy_workqueue(EXT4_SB(sb)->dio_unwritten_wq);
3841failed_mount_wq:
6fd058f7 3842 ext4_release_system_zone(sb);
0390131b
FM		 3843 if (sbi->s_journal) {
3844 jbd2_journal_destroy(sbi->s_journal);
3845 sbi->s_journal = NULL;
3846 }
ac27a0ec 3847failed_mount3:
04496411 3848 del_timer(&sbi->s_err_report);
9933fc0a
TT		 3849 if (sbi->s_flex_groups)
3850 ext4_kvfree(sbi->s_flex_groups);
57042651 3851 percpu_counter_destroy(&sbi->s_freeclusters_counter);
ce7e010a
TT		 3852 percpu_counter_destroy(&sbi->s_freeinodes_counter);
3853 percpu_counter_destroy(&sbi->s_dirs_counter);
57042651 3854 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
c5e06d10
JL		 3855 if (sbi->s_mmp_tsk)
3856 kthread_stop(sbi->s_mmp_tsk);
ac27a0ec
DK		 3857failed_mount2:
3858 for (i = 0; i < db_count; i++)
3859 brelse(sbi->s_group_desc[i]);
f18a5f21 3860 ext4_kvfree(sbi->s_group_desc);
ac27a0ec 3861failed_mount:
240799cd 3862 if (sbi->s_proc) {
9f6200bb 3863 remove_proc_entry(sb->s_id, ext4_proc_root);
240799cd 3864 }
ac27a0ec
DK		 3865#ifdef CONFIG_QUOTA
3866 for (i = 0; i < MAXQUOTAS; i++)
3867 kfree(sbi->s_qf_names[i]);
3868#endif
617ba13b 3869 ext4_blkdev_remove(sbi);
ac27a0ec
DK		 3870 brelse(bh);
3871out_fail:
3872 sb->s_fs_info = NULL;
f6830165 3873 kfree(sbi->s_blockgroup_lock);
ac27a0ec 3874 kfree(sbi);
dcc7dae3 3875out_free_orig:
d4c402d9 3876 kfree(orig_data);
1d1fe1ee 3877 return ret;
ac27a0ec
DK		 3878}
3879
3880/*
3881 * Setup any per-fs journal parameters now. We'll do this both on
3882 * initial mount, once the journal has been initialised but before we've
3883 * done any recovery; and again on any subsequent remount.
3884 */
617ba13b 3885static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
ac27a0ec 3886{
617ba13b 3887 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 3888
30773840
TT		 3889 journal->j_commit_interval = sbi->s_commit_interval;
3890 journal->j_min_batch_time = sbi->s_min_batch_time;
3891 journal->j_max_batch_time = sbi->s_max_batch_time;
ac27a0ec 3892
a931da6a 3893 write_lock(&journal->j_state_lock);
ac27a0ec 3894 if (test_opt(sb, BARRIER))
dab291af 3895 journal->j_flags |= JBD2_BARRIER;
ac27a0ec 3896 else
dab291af 3897 journal->j_flags &= ~JBD2_BARRIER;
5bf5683a
HK		 3898 if (test_opt(sb, DATA_ERR_ABORT))
3899 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
3900 else
3901 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
a931da6a 3902 write_unlock(&journal->j_state_lock);
ac27a0ec
DK		 3903}
3904
617ba13b 3905static journal_t *ext4_get_journal(struct super_block *sb,
ac27a0ec
DK		 3906 unsigned int journal_inum)
3907{
3908 struct inode *journal_inode;
3909 journal_t *journal;
3910
0390131b
FM		 3911 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3912
ac27a0ec
DK		 3913 /* First, test for the existence of a valid inode on disk. Bad
3914 * things happen if we iget() an unused inode, as the subsequent
3915 * iput() will try to delete it. */
3916
1d1fe1ee
DH		 3917 journal_inode = ext4_iget(sb, journal_inum);
3918 if (IS_ERR(journal_inode)) {
b31e1552 3919 ext4_msg(sb, KERN_ERR, "no journal found");
ac27a0ec
DK		 3920 return NULL;
3921 }
3922 if (!journal_inode->i_nlink) {
3923 make_bad_inode(journal_inode);
3924 iput(journal_inode);
b31e1552 3925 ext4_msg(sb, KERN_ERR, "journal inode is deleted");
ac27a0ec
DK		 3926 return NULL;
3927 }
3928
e5f8eab8 3929 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
ac27a0ec 3930 journal_inode, journal_inode->i_size);
1d1fe1ee 3931 if (!S_ISREG(journal_inode->i_mode)) {
b31e1552 3932 ext4_msg(sb, KERN_ERR, "invalid journal inode");
ac27a0ec
DK		 3933 iput(journal_inode);
3934 return NULL;
3935 }
3936
dab291af 3937 journal = jbd2_journal_init_inode(journal_inode);
ac27a0ec 3938 if (!journal) {
b31e1552 3939 ext4_msg(sb, KERN_ERR, "Could not load journal inode");
ac27a0ec
DK		 3940 iput(journal_inode);
3941 return NULL;
3942 }
3943 journal->j_private = sb;
617ba13b 3944 ext4_init_journal_params(sb, journal);
ac27a0ec
DK		 3945 return journal;
3946}
3947
617ba13b 3948static journal_t *ext4_get_dev_journal(struct super_block *sb,
ac27a0ec
DK		 3949 dev_t j_dev)
3950{
2b2d6d01 3951 struct buffer_head *bh;
ac27a0ec 3952 journal_t *journal;
617ba13b
MC		 3953 ext4_fsblk_t start;
3954 ext4_fsblk_t len;
ac27a0ec 3955 int hblock, blocksize;
617ba13b 3956 ext4_fsblk_t sb_block;
ac27a0ec 3957 unsigned long offset;
2b2d6d01 3958 struct ext4_super_block *es;
ac27a0ec
DK		 3959 struct block_device *bdev;
3960
0390131b
FM		 3961 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
3962
b31e1552 3963 bdev = ext4_blkdev_get(j_dev, sb);
ac27a0ec
DK		 3964 if (bdev == NULL)
3965 return NULL;
3966
ac27a0ec 3967 blocksize = sb->s_blocksize;
e1defc4f 3968 hblock = bdev_logical_block_size(bdev);
ac27a0ec 3969 if (blocksize < hblock) {
b31e1552
ES		 3970 ext4_msg(sb, KERN_ERR,
3971 "blocksize too small for journal device");
ac27a0ec
DK		 3972 goto out_bdev;
3973 }
3974
617ba13b
MC		 3975 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
3976 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
ac27a0ec
DK		 3977 set_blocksize(bdev, blocksize);
3978 if (!(bh = __bread(bdev, sb_block, blocksize))) {
b31e1552
ES		 3979 ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
3980 "external journal");
ac27a0ec
DK		 3981 goto out_bdev;
3982 }
3983
617ba13b
MC		 3984 es = (struct ext4_super_block *) (((char *)bh->b_data) + offset);
3985 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
ac27a0ec 3986 !(le32_to_cpu(es->s_feature_incompat) &
617ba13b 3987 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
b31e1552
ES		 3988 ext4_msg(sb, KERN_ERR, "external journal has "
3989 "bad superblock");
ac27a0ec
DK		 3990 brelse(bh);
3991 goto out_bdev;
3992 }
3993
617ba13b 3994 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
b31e1552 3995 ext4_msg(sb, KERN_ERR, "journal UUID does not match");
ac27a0ec
DK		 3996 brelse(bh);
3997 goto out_bdev;
3998 }
3999
bd81d8ee 4000 len = ext4_blocks_count(es);
ac27a0ec
DK		 4001 start = sb_block + 1;
4002 brelse(bh); /* we're done with the superblock */
4003
dab291af 4004 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
ac27a0ec
DK		 4005 start, len, blocksize);
4006 if (!journal) {
b31e1552 4007 ext4_msg(sb, KERN_ERR, "failed to create device journal");
ac27a0ec
DK		 4008 goto out_bdev;
4009 }
4010 journal->j_private = sb;
4011 ll_rw_block(READ, 1, &journal->j_sb_buffer);
4012 wait_on_buffer(journal->j_sb_buffer);
4013 if (!buffer_uptodate(journal->j_sb_buffer)) {
b31e1552 4014 ext4_msg(sb, KERN_ERR, "I/O error on journal device");
ac27a0ec
DK		 4015 goto out_journal;
4016 }
4017 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
b31e1552
ES		 4018 ext4_msg(sb, KERN_ERR, "External journal has more than one "
4019 "user (unsupported) - %d",
ac27a0ec
DK		 4020 be32_to_cpu(journal->j_superblock->s_nr_users));
4021 goto out_journal;
4022 }
617ba13b
MC		 4023 EXT4_SB(sb)->journal_bdev = bdev;
4024 ext4_init_journal_params(sb, journal);
ac27a0ec 4025 return journal;
0b8e58a1 4026
ac27a0ec 4027out_journal:
dab291af 4028 jbd2_journal_destroy(journal);
ac27a0ec 4029out_bdev:
617ba13b 4030 ext4_blkdev_put(bdev);
ac27a0ec
DK		 4031 return NULL;
4032}
4033
617ba13b
MC		 4034static int ext4_load_journal(struct super_block *sb,
4035 struct ext4_super_block *es,
ac27a0ec
DK		 4036 unsigned long journal_devnum)
4037{
4038 journal_t *journal;
4039 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
4040 dev_t journal_dev;
4041 int err = 0;
4042 int really_read_only;
4043
0390131b
FM		 4044 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4045
ac27a0ec
DK		 4046 if (journal_devnum &&
4047 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
b31e1552
ES		 4048 ext4_msg(sb, KERN_INFO, "external journal device major/minor "
4049 "numbers have changed");
ac27a0ec
DK		 4050 journal_dev = new_decode_dev(journal_devnum);
4051 } else
4052 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
4053
4054 really_read_only = bdev_read_only(sb->s_bdev);
4055
4056 /*
4057 * Are we loading a blank journal or performing recovery after a
4058 * crash? For recovery, we need to check in advance whether we
4059 * can get read-write access to the device.
4060 */
617ba13b 4061 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
ac27a0ec 4062 if (sb->s_flags & MS_RDONLY) {
b31e1552
ES		 4063 ext4_msg(sb, KERN_INFO, "INFO: recovery "
4064 "required on readonly filesystem");
ac27a0ec 4065 if (really_read_only) {
b31e1552
ES		 4066 ext4_msg(sb, KERN_ERR, "write access "
4067 "unavailable, cannot proceed");
ac27a0ec
DK		 4068 return -EROFS;
4069 }
b31e1552
ES		 4070 ext4_msg(sb, KERN_INFO, "write access will "
4071 "be enabled during recovery");
ac27a0ec
DK		 4072 }
4073 }
4074
4075 if (journal_inum && journal_dev) {
b31e1552
ES		 4076 ext4_msg(sb, KERN_ERR, "filesystem has both journal "
4077 "and inode journals!");
ac27a0ec
DK		 4078 return -EINVAL;
4079 }
4080
4081 if (journal_inum) {
617ba13b 4082 if (!(journal = ext4_get_journal(sb, journal_inum)))
ac27a0ec
DK		 4083 return -EINVAL;
4084 } else {
617ba13b 4085 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
ac27a0ec
DK		 4086 return -EINVAL;
4087 }
4088
90576c0b 4089 if (!(journal->j_flags & JBD2_BARRIER))
b31e1552 4090 ext4_msg(sb, KERN_INFO, "barriers disabled");
4776004f 4091
ac27a0ec 4092 if (!really_read_only && test_opt(sb, UPDATE_JOURNAL)) {
dab291af 4093 err = jbd2_journal_update_format(journal);
ac27a0ec 4094 if (err) {
b31e1552 4095 ext4_msg(sb, KERN_ERR, "error updating journal");
dab291af 4096 jbd2_journal_destroy(journal);
ac27a0ec
DK		 4097 return err;
4098 }
4099 }
4100
617ba13b 4101 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
dab291af 4102 err = jbd2_journal_wipe(journal, !really_read_only);
1c13d5c0
TT		 4103 if (!err) {
4104 char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL);
4105 if (save)
4106 memcpy(save, ((char *) es) +
4107 EXT4_S_ERR_START, EXT4_S_ERR_LEN);
dab291af 4108 err = jbd2_journal_load(journal);
1c13d5c0
TT		 4109 if (save)
4110 memcpy(((char *) es) + EXT4_S_ERR_START,
4111 save, EXT4_S_ERR_LEN);
4112 kfree(save);
4113 }
ac27a0ec
DK		 4114
4115 if (err) {
b31e1552 4116 ext4_msg(sb, KERN_ERR, "error loading journal");
dab291af 4117 jbd2_journal_destroy(journal);
ac27a0ec
DK		 4118 return err;
4119 }
4120
617ba13b
MC		 4121 EXT4_SB(sb)->s_journal = journal;
4122 ext4_clear_journal_err(sb, es);
ac27a0ec 4123
c41303ce 4124 if (!really_read_only && journal_devnum &&
ac27a0ec
DK		 4125 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
4126 es->s_journal_dev = cpu_to_le32(journal_devnum);
ac27a0ec
DK		 4127
4128 /* Make sure we flush the recovery flag to disk. */
e2d67052 4129 ext4_commit_super(sb, 1);
ac27a0ec
DK		 4130 }
4131
4132 return 0;
4133}
4134
e2d67052 4135static int ext4_commit_super(struct super_block *sb, int sync)
ac27a0ec 4136{
e2d67052 4137 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
617ba13b 4138 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
c4be0c1d 4139 int error = 0;
ac27a0ec 4140
7c2e7087 4141 if (!sbh || block_device_ejected(sb))
c4be0c1d 4142 return error;
914258bf
TT		 4143 if (buffer_write_io_error(sbh)) {
4144 /*
4145 * Oh, dear. A previous attempt to write the
4146 * superblock failed. This could happen because the
4147 * USB device was yanked out. Or it could happen to
4148 * be a transient write error and maybe the block will
4149 * be remapped. Nothing we can do but to retry the
4150 * write and hope for the best.
4151 */
b31e1552
ES		 4152 ext4_msg(sb, KERN_ERR, "previous I/O error to "
4153 "superblock detected");
914258bf
TT		 4154 clear_buffer_write_io_error(sbh);
4155 set_buffer_uptodate(sbh);
4156 }
71290b36
TT		 4157 /*
4158 * If the file system is mounted read-only, don't update the
4159 * superblock write time. This avoids updating the superblock
4160 * write time when we are mounting the root file system
4161 * read/only but we need to replay the journal; at that point,
4162 * for people who are east of GMT and who make their clock
4163 * tick in localtime for Windows bug-for-bug compatibility,
4164 * the clock is set in the future, and this will cause e2fsck
4165 * to complain and force a full file system check.
4166 */
4167 if (!(sb->s_flags & MS_RDONLY))
4168 es->s_wtime = cpu_to_le32(get_seconds());
f613dfcb
TT		 4169 if (sb->s_bdev->bd_part)
4170 es->s_kbytes_written =
4171 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written +
afc32f7e
TT		 4172 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
4173 EXT4_SB(sb)->s_sectors_written_start) >> 1));
f613dfcb
TT		 4174 else
4175 es->s_kbytes_written =
4176 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written);
57042651
TT		 4177 ext4_free_blocks_count_set(es,
4178 EXT4_C2B(EXT4_SB(sb), percpu_counter_sum_positive(
4179 &EXT4_SB(sb)->s_freeclusters_counter)));
ce7e010a
TT		 4180 es->s_free_inodes_count =
4181 cpu_to_le32(percpu_counter_sum_positive(
4182 &EXT4_SB(sb)->s_freeinodes_counter));
7234ab2a 4183 sb->s_dirt = 0;
ac27a0ec
DK		 4184 BUFFER_TRACE(sbh, "marking dirty");
4185 mark_buffer_dirty(sbh);
914258bf 4186 if (sync) {
c4be0c1d
TS		 4187 error = sync_dirty_buffer(sbh);
4188 if (error)
4189 return error;
4190
4191 error = buffer_write_io_error(sbh);
4192 if (error) {
b31e1552
ES		 4193 ext4_msg(sb, KERN_ERR, "I/O error while writing "
4194 "superblock");
914258bf
TT		 4195 clear_buffer_write_io_error(sbh);
4196 set_buffer_uptodate(sbh);
4197 }
4198 }
c4be0c1d 4199 return error;
ac27a0ec
DK		 4200}
4201
ac27a0ec
DK		 4202/*
4203 * Have we just finished recovery? If so, and if we are mounting (or
4204 * remounting) the filesystem readonly, then we will end up with a
4205 * consistent fs on disk. Record that fact.
4206 */
2b2d6d01
TT		 4207static void ext4_mark_recovery_complete(struct super_block *sb,
4208 struct ext4_super_block *es)
ac27a0ec 4209{
617ba13b 4210 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 4211
0390131b
FM		 4212 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
4213 BUG_ON(journal != NULL);
4214 return;
4215 }
dab291af 4216 jbd2_journal_lock_updates(journal);
7ffe1ea8
HK		 4217 if (jbd2_journal_flush(journal) < 0)
4218 goto out;
4219
617ba13b 4220 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
ac27a0ec 4221 sb->s_flags & MS_RDONLY) {
617ba13b 4222 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
e2d67052 4223 ext4_commit_super(sb, 1);
ac27a0ec 4224 }
7ffe1ea8
HK		 4225
4226out:
dab291af 4227 jbd2_journal_unlock_updates(journal);
ac27a0ec
DK		 4228}
4229
4230/*
4231 * If we are mounting (or read-write remounting) a filesystem whose journal
4232 * has recorded an error from a previous lifetime, move that error to the
4233 * main filesystem now.
4234 */
2b2d6d01
TT		 4235static void ext4_clear_journal_err(struct super_block *sb,
4236 struct ext4_super_block *es)
ac27a0ec
DK		 4237{
4238 journal_t *journal;
4239 int j_errno;
4240 const char *errstr;
4241
0390131b
FM		 4242 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4243
617ba13b 4244 journal = EXT4_SB(sb)->s_journal;
ac27a0ec
DK		 4245
4246 /*
4247 * Now check for any error status which may have been recorded in the
617ba13b 4248 * journal by a prior ext4_error() or ext4_abort()
ac27a0ec
DK		 4249 */
4250
dab291af 4251 j_errno = jbd2_journal_errno(journal);
ac27a0ec
DK		 4252 if (j_errno) {
4253 char nbuf[16];
4254
617ba13b 4255 errstr = ext4_decode_error(sb, j_errno, nbuf);
12062ddd 4256 ext4_warning(sb, "Filesystem error recorded "
ac27a0ec 4257 "from previous mount: %s", errstr);
12062ddd 4258 ext4_warning(sb, "Marking fs in need of filesystem check.");
ac27a0ec 4259
617ba13b
MC		 4260 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
4261 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
e2d67052 4262 ext4_commit_super(sb, 1);
ac27a0ec 4263
dab291af 4264 jbd2_journal_clear_err(journal);
ac27a0ec
DK		 4265 }
4266}
4267
4268/*
4269 * Force the running and committing transactions to commit,
4270 * and wait on the commit.
4271 */
617ba13b 4272int ext4_force_commit(struct super_block *sb)
ac27a0ec
DK		 4273{
4274 journal_t *journal;
0390131b 4275 int ret = 0;
ac27a0ec
DK		 4276
4277 if (sb->s_flags & MS_RDONLY)
4278 return 0;
4279
617ba13b 4280 journal = EXT4_SB(sb)->s_journal;
6b0310fb 4281 if (journal) {
437f88cc 4282 vfs_check_frozen(sb, SB_FREEZE_TRANS);
0390131b 4283 ret = ext4_journal_force_commit(journal);
6b0310fb 4284 }
0390131b 4285
ac27a0ec
DK		 4286 return ret;
4287}
4288
2b2d6d01 4289static void ext4_write_super(struct super_block *sb)
ac27a0ec 4290{
ebc1ac16 4291 lock_super(sb);
9ca92389 4292 ext4_commit_super(sb, 1);
ebc1ac16 4293 unlock_super(sb);
ac27a0ec
DK		 4294}
4295
617ba13b 4296static int ext4_sync_fs(struct super_block *sb, int wait)
ac27a0ec 4297{
14ce0cb4 4298 int ret = 0;
9eddacf9 4299 tid_t target;
8d5d02e6 4300 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4301
9bffad1e 4302 trace_ext4_sync_fs(sb, wait);
8d5d02e6
MC		 4303 flush_workqueue(sbi->dio_unwritten_wq);
4304 if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
9ca92389 4305 if (wait)
8d5d02e6 4306 jbd2_log_wait_commit(sbi->s_journal, target);
0390131b 4307 }
14ce0cb4 4308 return ret;
ac27a0ec
DK		 4309}
4310
4311/*
4312 * LVM calls this function before a (read-only) snapshot is created. This
4313 * gives us a chance to flush the journal completely and mark the fs clean.
be4f27d3
YY		 4314 *
4315 * Note that only this function cannot bring a filesystem to be in a clean
4316 * state independently, because ext4 prevents a new handle from being started
4317 * by @sb->s_frozen, which stays in an upper layer. It thus needs help from
4318 * the upper layer.
ac27a0ec 4319 */
c4be0c1d 4320static int ext4_freeze(struct super_block *sb)
ac27a0ec 4321{
c4be0c1d
TS		 4322 int error = 0;
4323 journal_t *journal;
ac27a0ec 4324
9ca92389
TT		 4325 if (sb->s_flags & MS_RDONLY)
4326 return 0;
ac27a0ec 4327
9ca92389 4328 journal = EXT4_SB(sb)->s_journal;
7ffe1ea8 4329
9ca92389
TT		 4330 /* Now we set up the journal barrier. */
4331 jbd2_journal_lock_updates(journal);
ac27a0ec 4332
9ca92389
TT		 4333 /*
4334 * Don't clear the needs_recovery flag if we failed to flush
4335 * the journal.
4336 */
4337 error = jbd2_journal_flush(journal);
6b0310fb
ES		 4338 if (error < 0)
4339 goto out;
9ca92389
TT		 4340
4341 /* Journal blocked and flushed, clear needs_recovery flag. */
4342 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4343 error = ext4_commit_super(sb, 1);
6b0310fb
ES		 4344out:
4345 /* we rely on s_frozen to stop further updates */
4346 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
4347 return error;
ac27a0ec
DK		 4348}
4349
4350/*
4351 * Called by LVM after the snapshot is done. We need to reset the RECOVER
4352 * flag here, even though the filesystem is not technically dirty yet.
4353 */
c4be0c1d 4354static int ext4_unfreeze(struct super_block *sb)
ac27a0ec 4355{
9ca92389
TT		 4356 if (sb->s_flags & MS_RDONLY)
4357 return 0;
4358
4359 lock_super(sb);
4360 /* Reset the needs_recovery flag before the fs is unlocked. */
4361 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4362 ext4_commit_super(sb, 1);
4363 unlock_super(sb);
c4be0c1d 4364 return 0;
ac27a0ec
DK		 4365}
4366
673c6100
TT		 4367/*
4368 * Structure to save mount options for ext4_remount's benefit
4369 */
4370struct ext4_mount_options {
4371 unsigned long s_mount_opt;
a2595b8a 4372 unsigned long s_mount_opt2;
673c6100
TT		 4373 uid_t s_resuid;
4374 gid_t s_resgid;
4375 unsigned long s_commit_interval;
4376 u32 s_min_batch_time, s_max_batch_time;
4377#ifdef CONFIG_QUOTA
4378 int s_jquota_fmt;
4379 char *s_qf_names[MAXQUOTAS];
4380#endif
4381};
4382
2b2d6d01 4383static int ext4_remount(struct super_block *sb, int *flags, char *data)
ac27a0ec 4384{
2b2d6d01 4385 struct ext4_super_block *es;
617ba13b
MC		 4386 struct ext4_sb_info *sbi = EXT4_SB(sb);
4387 ext4_fsblk_t n_blocks_count = 0;
ac27a0ec 4388 unsigned long old_sb_flags;
617ba13b 4389 struct ext4_mount_options old_opts;
c79d967d 4390 int enable_quota = 0;
8a266467 4391 ext4_group_t g;
b3881f74 4392 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
c5e06d10 4393 int err = 0;
ac27a0ec
DK		 4394#ifdef CONFIG_QUOTA
4395 int i;
4396#endif
d4c402d9 4397 char *orig_data = kstrdup(data, GFP_KERNEL);
ac27a0ec
DK		 4398
4399 /* Store the original options */
bbd6851a 4400 lock_super(sb);
ac27a0ec
DK		 4401 old_sb_flags = sb->s_flags;
4402 old_opts.s_mount_opt = sbi->s_mount_opt;
a2595b8a 4403 old_opts.s_mount_opt2 = sbi->s_mount_opt2;
ac27a0ec
DK		 4404 old_opts.s_resuid = sbi->s_resuid;
4405 old_opts.s_resgid = sbi->s_resgid;
4406 old_opts.s_commit_interval = sbi->s_commit_interval;
30773840
TT		 4407 old_opts.s_min_batch_time = sbi->s_min_batch_time;
4408 old_opts.s_max_batch_time = sbi->s_max_batch_time;
ac27a0ec
DK		 4409#ifdef CONFIG_QUOTA
4410 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
4411 for (i = 0; i < MAXQUOTAS; i++)
4412 old_opts.s_qf_names[i] = sbi->s_qf_names[i];
4413#endif
b3881f74
TT		 4414 if (sbi->s_journal && sbi->s_journal->j_task->io_context)
4415 journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
ac27a0ec
DK		 4416
4417 /*
4418 * Allow the "check" option to be passed as a remount option.
4419 */
b3881f74
TT		 4420 if (!parse_options(data, sb, NULL, &journal_ioprio,
4421 &n_blocks_count, 1)) {
ac27a0ec
DK		 4422 err = -EINVAL;
4423 goto restore_opts;
4424 }
4425
4ab2f15b 4426 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
c67d859e 4427 ext4_abort(sb, "Abort forced by user");
ac27a0ec
DK		 4428
4429 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
482a7425 4430 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec
DK		 4431
4432 es = sbi->s_es;
4433
b3881f74 4434 if (sbi->s_journal) {
0390131b 4435 ext4_init_journal_params(sb, sbi->s_journal);
b3881f74
TT		 4436 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
4437 }
ac27a0ec
DK		 4438
4439 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY) ||
bd81d8ee 4440 n_blocks_count > ext4_blocks_count(es)) {
4ab2f15b 4441 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) {
ac27a0ec
DK		 4442 err = -EROFS;
4443 goto restore_opts;
4444 }
4445
4446 if (*flags & MS_RDONLY) {
0f0dd62f
CH		 4447 err = dquot_suspend(sb, -1);
4448 if (err < 0)
c79d967d 4449 goto restore_opts;
c79d967d 4450
ac27a0ec
DK		 4451 /*
4452 * First of all, the unconditional stuff we have to do
4453 * to disable replay of the journal when we next remount
4454 */
4455 sb->s_flags |= MS_RDONLY;
4456
4457 /*
4458 * OK, test if we are remounting a valid rw partition
4459 * readonly, and if so set the rdonly flag and then
4460 * mark the partition as valid again.
4461 */
617ba13b
MC		 4462 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
4463 (sbi->s_mount_state & EXT4_VALID_FS))
ac27a0ec
DK		 4464 es->s_state = cpu_to_le16(sbi->s_mount_state);
4465
a63c9eb2 4466 if (sbi->s_journal)
0390131b 4467 ext4_mark_recovery_complete(sb, es);
ac27a0ec 4468 } else {
a13fb1a4
ES		 4469 /* Make sure we can mount this feature set readwrite */
4470 if (!ext4_feature_set_ok(sb, 0)) {
ac27a0ec
DK		 4471 err = -EROFS;
4472 goto restore_opts;
4473 }
8a266467
TT		 4474 /*
4475 * Make sure the group descriptor checksums
0b8e58a1 4476 * are sane. If they aren't, refuse to remount r/w.
8a266467
TT		 4477 */
4478 for (g = 0; g < sbi->s_groups_count; g++) {
4479 struct ext4_group_desc *gdp =
4480 ext4_get_group_desc(sb, g, NULL);
4481
4482 if (!ext4_group_desc_csum_verify(sbi, g, gdp)) {
b31e1552
ES		 4483 ext4_msg(sb, KERN_ERR,
4484 "ext4_remount: Checksum for group %u failed (%u!=%u)",
8a266467
TT		 4485 g, le16_to_cpu(ext4_group_desc_csum(sbi, g, gdp)),
4486 le16_to_cpu(gdp->bg_checksum));
4487 err = -EINVAL;
4488 goto restore_opts;
4489 }
4490 }
4491
ead6596b
ES		 4492 /*
4493 * If we have an unprocessed orphan list hanging
4494 * around from a previously readonly bdev mount,
4495 * require a full umount/remount for now.
4496 */
4497 if (es->s_last_orphan) {
b31e1552 4498 ext4_msg(sb, KERN_WARNING, "Couldn't "
ead6596b
ES		 4499 "remount RDWR because of unprocessed "
4500 "orphan inode list. Please "
b31e1552 4501 "umount/remount instead");
ead6596b
ES		 4502 err = -EINVAL;
4503 goto restore_opts;
4504 }
4505
ac27a0ec
DK		 4506 /*
4507 * Mounting a RDONLY partition read-write, so reread
4508 * and store the current valid flag. (It may have
4509 * been changed by e2fsck since we originally mounted
4510 * the partition.)
4511 */
0390131b
FM		 4512 if (sbi->s_journal)
4513 ext4_clear_journal_err(sb, es);
ac27a0ec 4514 sbi->s_mount_state = le16_to_cpu(es->s_state);
617ba13b 4515 if ((err = ext4_group_extend(sb, es, n_blocks_count)))
ac27a0ec 4516 goto restore_opts;
2b2d6d01 4517 if (!ext4_setup_super(sb, es, 0))
ac27a0ec 4518 sb->s_flags &= ~MS_RDONLY;
c5e06d10
JL		 4519 if (EXT4_HAS_INCOMPAT_FEATURE(sb,
4520 EXT4_FEATURE_INCOMPAT_MMP))
4521 if (ext4_multi_mount_protect(sb,
4522 le64_to_cpu(es->s_mmp_block))) {
4523 err = -EROFS;
4524 goto restore_opts;
4525 }
c79d967d 4526 enable_quota = 1;
ac27a0ec
DK		 4527 }
4528 }
bfff6873
LC		 4529
4530 /*
4531 * Reinitialize lazy itable initialization thread based on
4532 * current settings
4533 */
4534 if ((sb->s_flags & MS_RDONLY) || !test_opt(sb, INIT_INODE_TABLE))
4535 ext4_unregister_li_request(sb);
4536 else {
4537 ext4_group_t first_not_zeroed;
4538 first_not_zeroed = ext4_has_uninit_itable(sb);
4539 ext4_register_li_request(sb, first_not_zeroed);
4540 }
4541
6fd058f7 4542 ext4_setup_system_zone(sb);
0390131b 4543 if (sbi->s_journal == NULL)
e2d67052 4544 ext4_commit_super(sb, 1);
0390131b 4545
ac27a0ec
DK		 4546#ifdef CONFIG_QUOTA
4547 /* Release old quota file names */
4548 for (i = 0; i < MAXQUOTAS; i++)
4549 if (old_opts.s_qf_names[i] &&
4550 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
4551 kfree(old_opts.s_qf_names[i]);
4552#endif
bbd6851a 4553 unlock_super(sb);
c79d967d 4554 if (enable_quota)
0f0dd62f 4555 dquot_resume(sb, -1);
d4c402d9
CW		 4556
4557 ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s", orig_data);
4558 kfree(orig_data);
ac27a0ec 4559 return 0;
0b8e58a1 4560
ac27a0ec
DK		 4561restore_opts:
4562 sb->s_flags = old_sb_flags;
4563 sbi->s_mount_opt = old_opts.s_mount_opt;
a2595b8a 4564 sbi->s_mount_opt2 = old_opts.s_mount_opt2;
ac27a0ec
DK		 4565 sbi->s_resuid = old_opts.s_resuid;
4566 sbi->s_resgid = old_opts.s_resgid;
4567 sbi->s_commit_interval = old_opts.s_commit_interval;
30773840
TT		 4568 sbi->s_min_batch_time = old_opts.s_min_batch_time;
4569 sbi->s_max_batch_time = old_opts.s_max_batch_time;
ac27a0ec
DK		 4570#ifdef CONFIG_QUOTA
4571 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
4572 for (i = 0; i < MAXQUOTAS; i++) {
4573 if (sbi->s_qf_names[i] &&
4574 old_opts.s_qf_names[i] != sbi->s_qf_names[i])
4575 kfree(sbi->s_qf_names[i]);
4576 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
4577 }
4578#endif
bbd6851a 4579 unlock_super(sb);
d4c402d9 4580 kfree(orig_data);
ac27a0ec
DK		 4581 return err;
4582}
4583
f975d6bc
TT		 4584/*
4585 * Note: calculating the overhead so we can be compatible with
4586 * historical BSD practice is quite difficult in the face of
4587 * clusters/bigalloc. This is because multiple metadata blocks from
4588 * different block group can end up in the same allocation cluster.
4589 * Calculating the exact overhead in the face of clustered allocation
4590 * requires either O(all block bitmaps) in memory or O(number of block
4591 * groups**2) in time. We will still calculate the superblock for
4592 * older file systems --- and if we come across with a bigalloc file
4593 * system with zero in s_overhead_clusters the estimate will be close to
4594 * correct especially for very large cluster sizes --- but for newer
4595 * file systems, it's better to calculate this figure once at mkfs
4596 * time, and store it in the superblock. If the superblock value is
4597 * present (even for non-bigalloc file systems), we will use it.
4598 */
2b2d6d01 4599static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
ac27a0ec
DK		 4600{
4601 struct super_block *sb = dentry->d_sb;
617ba13b
MC		 4602 struct ext4_sb_info *sbi = EXT4_SB(sb);
4603 struct ext4_super_block *es = sbi->s_es;
f975d6bc 4604 struct ext4_group_desc *gdp;
960cc398 4605 u64 fsid;
d02a9391 4606 s64 bfree;
ac27a0ec 4607
5e70030d
BP		 4608 if (test_opt(sb, MINIX_DF)) {
4609 sbi->s_overhead_last = 0;
f975d6bc
TT		 4610 } else if (es->s_overhead_clusters) {
4611 sbi->s_overhead_last = le32_to_cpu(es->s_overhead_clusters);
6bc9feff 4612 } else if (sbi->s_blocks_last != ext4_blocks_count(es)) {
8df9675f 4613 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
5e70030d 4614 ext4_fsblk_t overhead = 0;
ac27a0ec
DK		 4615
4616 /*
5e70030d
BP		 4617 * Compute the overhead (FS structures). This is constant
4618 * for a given filesystem unless the number of block groups
4619 * changes so we cache the previous value until it does.
ac27a0ec
DK		 4620 */
4621
4622 /*
4623 * All of the blocks before first_data_block are
4624 * overhead
4625 */
f975d6bc 4626 overhead = EXT4_B2C(sbi, le32_to_cpu(es->s_first_data_block));
ac27a0ec
DK		 4627
4628 /*
f975d6bc 4629 * Add the overhead found in each block group
ac27a0ec
DK		 4630 */
4631 for (i = 0; i < ngroups; i++) {
f975d6bc
TT		 4632 gdp = ext4_get_group_desc(sb, i, NULL);
4633 overhead += ext4_num_overhead_clusters(sb, i, gdp);
ac27a0ec
DK		 4634 cond_resched();
4635 }
5e70030d
BP		 4636 sbi->s_overhead_last = overhead;
4637 smp_wmb();
6bc9feff 4638 sbi->s_blocks_last = ext4_blocks_count(es);
ac27a0ec
DK		 4639 }
4640
617ba13b 4641 buf->f_type = EXT4_SUPER_MAGIC;
ac27a0ec 4642 buf->f_bsize = sb->s_blocksize;
f975d6bc
TT		 4643 buf->f_blocks = (ext4_blocks_count(es) -
4644 EXT4_C2B(sbi, sbi->s_overhead_last));
57042651
TT		 4645 bfree = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) -
4646 percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter);
d02a9391 4647 /* prevent underflow in case that few free space is available */
57042651 4648 buf->f_bfree = EXT4_C2B(sbi, max_t(s64, bfree, 0));
bd81d8ee
LV		 4649 buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es);
4650 if (buf->f_bfree < ext4_r_blocks_count(es))
ac27a0ec
DK		 4651 buf->f_bavail = 0;
4652 buf->f_files = le32_to_cpu(es->s_inodes_count);
52d9f3b4 4653 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
617ba13b 4654 buf->f_namelen = EXT4_NAME_LEN;
960cc398
PE		 4655 fsid = le64_to_cpup((void *)es->s_uuid) ^
4656 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
4657 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
4658 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
0b8e58a1 4659
ac27a0ec
DK		 4660 return 0;
4661}
4662
0b8e58a1
AD		 4663/* Helper function for writing quotas on sync - we need to start transaction
4664 * before quota file is locked for write. Otherwise the are possible deadlocks:
ac27a0ec 4665 * Process 1 Process 2
617ba13b 4666 * ext4_create() quota_sync()
a269eb18 4667 * jbd2_journal_start() write_dquot()
871a2931 4668 * dquot_initialize() down(dqio_mutex)
dab291af 4669 * down(dqio_mutex) jbd2_journal_start()
ac27a0ec
DK		 4670 *
4671 */
4672
4673#ifdef CONFIG_QUOTA
4674
4675static inline struct inode *dquot_to_inode(struct dquot *dquot)
4676{
4677 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_type];
4678}
4679
617ba13b 4680static int ext4_write_dquot(struct dquot *dquot)
ac27a0ec
DK		 4681{
4682 int ret, err;
4683 handle_t *handle;
4684 struct inode *inode;
4685
4686 inode = dquot_to_inode(dquot);
617ba13b 4687 handle = ext4_journal_start(inode,
0b8e58a1 4688 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 4689 if (IS_ERR(handle))
4690 return PTR_ERR(handle);
4691 ret = dquot_commit(dquot);
617ba13b 4692 err = ext4_journal_stop(handle);
ac27a0ec
DK		 4693 if (!ret)
4694 ret = err;
4695 return ret;
4696}
4697
617ba13b 4698static int ext4_acquire_dquot(struct dquot *dquot)
ac27a0ec
DK		 4699{
4700 int ret, err;
4701 handle_t *handle;
4702
617ba13b 4703 handle = ext4_journal_start(dquot_to_inode(dquot),
0b8e58a1 4704 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 4705 if (IS_ERR(handle))
4706 return PTR_ERR(handle);
4707 ret = dquot_acquire(dquot);
617ba13b 4708 err = ext4_journal_stop(handle);
ac27a0ec
DK		 4709 if (!ret)
4710 ret = err;
4711 return ret;
4712}
4713
617ba13b 4714static int ext4_release_dquot(struct dquot *dquot)
ac27a0ec
DK		 4715{
4716 int ret, err;
4717 handle_t *handle;
4718
617ba13b 4719 handle = ext4_journal_start(dquot_to_inode(dquot),
0b8e58a1 4720 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
9c3013e9
JK		 4721 if (IS_ERR(handle)) {
4722 /* Release dquot anyway to avoid endless cycle in dqput() */
4723 dquot_release(dquot);
ac27a0ec 4724 return PTR_ERR(handle);
9c3013e9 4725 }
ac27a0ec 4726 ret = dquot_release(dquot);
617ba13b 4727 err = ext4_journal_stop(handle);
ac27a0ec
DK		 4728 if (!ret)
4729 ret = err;
4730 return ret;
4731}
4732
617ba13b 4733static int ext4_mark_dquot_dirty(struct dquot *dquot)
ac27a0ec 4734{
2c8be6b2 4735 /* Are we journaling quotas? */
617ba13b
MC		 4736 if (EXT4_SB(dquot->dq_sb)->s_qf_names[USRQUOTA] ||
4737 EXT4_SB(dquot->dq_sb)->s_qf_names[GRPQUOTA]) {
ac27a0ec 4738 dquot_mark_dquot_dirty(dquot);
617ba13b 4739 return ext4_write_dquot(dquot);
ac27a0ec
DK		 4740 } else {
4741 return dquot_mark_dquot_dirty(dquot);
4742 }
4743}
4744
617ba13b 4745static int ext4_write_info(struct super_block *sb, int type)
ac27a0ec
DK		 4746{
4747 int ret, err;
4748 handle_t *handle;
4749
4750 /* Data block + inode block */
617ba13b 4751 handle = ext4_journal_start(sb->s_root->d_inode, 2);
ac27a0ec
DK		 4752 if (IS_ERR(handle))
4753 return PTR_ERR(handle);
4754 ret = dquot_commit_info(sb, type);
617ba13b 4755 err = ext4_journal_stop(handle);
ac27a0ec
DK		 4756 if (!ret)
4757 ret = err;
4758 return ret;
4759}
4760
4761/*
4762 * Turn on quotas during mount time - we need to find
4763 * the quota file and such...
4764 */
617ba13b 4765static int ext4_quota_on_mount(struct super_block *sb, int type)
ac27a0ec 4766{
287a8095
CH		 4767 return dquot_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
4768 EXT4_SB(sb)->s_jquota_fmt, type);
ac27a0ec
DK		 4769}
4770
4771/*
4772 * Standard function to be called on quota_on
4773 */
617ba13b 4774static int ext4_quota_on(struct super_block *sb, int type, int format_id,
f00c9e44 4775 struct path *path)
ac27a0ec
DK		 4776{
4777 int err;
ac27a0ec
DK		 4778
4779 if (!test_opt(sb, QUOTA))
4780 return -EINVAL;
0623543b 4781
ac27a0ec 4782 /* Quotafile not on the same filesystem? */
f00c9e44 4783 if (path->mnt->mnt_sb != sb)
ac27a0ec 4784 return -EXDEV;
0623543b
JK		 4785 /* Journaling quota? */
4786 if (EXT4_SB(sb)->s_qf_names[type]) {
2b2d6d01 4787 /* Quotafile not in fs root? */
f00c9e44 4788 if (path->dentry->d_parent != sb->s_root)
b31e1552
ES		 4789 ext4_msg(sb, KERN_WARNING,
4790 "Quota file not on filesystem root. "
4791 "Journaled quota will not work");
2b2d6d01 4792 }
0623543b
JK		 4793
4794 /*
4795 * When we journal data on quota file, we have to flush journal to see
4796 * all updates to the file when we bypass pagecache...
4797 */
0390131b 4798 if (EXT4_SB(sb)->s_journal &&
f00c9e44 4799 ext4_should_journal_data(path->dentry->d_inode)) {
0623543b
JK		 4800 /*
4801 * We don't need to lock updates but journal_flush() could
4802 * otherwise be livelocked...
4803 */
4804 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
7ffe1ea8 4805 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
0623543b 4806 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
f00c9e44 4807 if (err)
7ffe1ea8 4808 return err;
0623543b
JK		 4809 }
4810
f00c9e44 4811 return dquot_quota_on(sb, type, format_id, path);
ac27a0ec
DK		 4812}
4813
ca0e05e4
DM		 4814static int ext4_quota_off(struct super_block *sb, int type)
4815{
21f97697
JK		 4816 struct inode *inode = sb_dqopt(sb)->files[type];
4817 handle_t *handle;
4818
87009d86
DM		 4819 /* Force all delayed allocation blocks to be allocated.
4820 * Caller already holds s_umount sem */
4821 if (test_opt(sb, DELALLOC))
ca0e05e4 4822 sync_filesystem(sb);
ca0e05e4 4823
0b268590
AG		 4824 if (!inode)
4825 goto out;
4826
21f97697
JK		 4827 /* Update modification times of quota files when userspace can
4828 * start looking at them */
4829 handle = ext4_journal_start(inode, 1);
4830 if (IS_ERR(handle))
4831 goto out;
4832 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
4833 ext4_mark_inode_dirty(handle, inode);
4834 ext4_journal_stop(handle);
4835
4836out:
ca0e05e4
DM		 4837 return dquot_quota_off(sb, type);
4838}
4839
ac27a0ec
DK		 4840/* Read data from quotafile - avoid pagecache and such because we cannot afford
4841 * acquiring the locks... As quota files are never truncated and quota code
25985edc 4842 * itself serializes the operations (and no one else should touch the files)
ac27a0ec 4843 * we don't have to be afraid of races */
617ba13b 4844static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec
DK		 4845 size_t len, loff_t off)
4846{
4847 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 4848 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 4849 int err = 0;
4850 int offset = off & (sb->s_blocksize - 1);
4851 int tocopy;
4852 size_t toread;
4853 struct buffer_head *bh;
4854 loff_t i_size = i_size_read(inode);
4855
4856 if (off > i_size)
4857 return 0;
4858 if (off+len > i_size)
4859 len = i_size-off;
4860 toread = len;
4861 while (toread > 0) {
4862 tocopy = sb->s_blocksize - offset < toread ?
4863 sb->s_blocksize - offset : toread;
617ba13b 4864 bh = ext4_bread(NULL, inode, blk, 0, &err);
ac27a0ec
DK		 4865 if (err)
4866 return err;
4867 if (!bh) /* A hole? */
4868 memset(data, 0, tocopy);
4869 else
4870 memcpy(data, bh->b_data+offset, tocopy);
4871 brelse(bh);
4872 offset = 0;
4873 toread -= tocopy;
4874 data += tocopy;
4875 blk++;
4876 }
4877 return len;
4878}
4879
4880/* Write to quotafile (we know the transaction is already started and has
4881 * enough credits) */
617ba13b 4882static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec
DK		 4883 const char *data, size_t len, loff_t off)
4884{
4885 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 4886 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 4887 int err = 0;
4888 int offset = off & (sb->s_blocksize - 1);
ac27a0ec
DK		 4889 struct buffer_head *bh;
4890 handle_t *handle = journal_current_handle();
4891
0390131b 4892 if (EXT4_SB(sb)->s_journal && !handle) {
b31e1552
ES		 4893 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
4894 " cancelled because transaction is not started",
9c3013e9
JK		 4895 (unsigned long long)off, (unsigned long long)len);
4896 return -EIO;
4897 }
67eeb568
DM		 4898 /*
4899 * Since we account only one data block in transaction credits,
4900 * then it is impossible to cross a block boundary.
4901 */
4902 if (sb->s_blocksize - offset < len) {
4903 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
4904 " cancelled because not block aligned",
4905 (unsigned long long)off, (unsigned long long)len);
4906 return -EIO;
4907 }
4908
ac27a0ec 4909 mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA);
67eeb568
DM		 4910 bh = ext4_bread(handle, inode, blk, 1, &err);
4911 if (!bh)
4912 goto out;
62d2b5f2
JK		 4913 err = ext4_journal_get_write_access(handle, bh);
4914 if (err) {
4915 brelse(bh);
4916 goto out;
ac27a0ec 4917 }
67eeb568
DM		 4918 lock_buffer(bh);
4919 memcpy(bh->b_data+offset, data, len);
4920 flush_dcache_page(bh->b_page);
4921 unlock_buffer(bh);
62d2b5f2 4922 err = ext4_handle_dirty_metadata(handle, NULL, bh);
67eeb568 4923 brelse(bh);
ac27a0ec 4924out:
67eeb568 4925 if (err) {
4d04e4fb 4926 mutex_unlock(&inode->i_mutex);
ac27a0ec 4927 return err;
4d04e4fb 4928 }
67eeb568
DM		 4929 if (inode->i_size < off + len) {
4930 i_size_write(inode, off + len);
617ba13b 4931 EXT4_I(inode)->i_disksize = inode->i_size;
21f97697 4932 ext4_mark_inode_dirty(handle, inode);
ac27a0ec 4933 }
ac27a0ec 4934 mutex_unlock(&inode->i_mutex);
67eeb568 4935 return len;
ac27a0ec
DK		 4936}
4937
4938#endif
4939
152a0836
AV		 4940static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
4941 const char *dev_name, void *data)
ac27a0ec 4942{
152a0836 4943 return mount_bdev(fs_type, flags, dev_name, data, ext4_fill_super);
ac27a0ec
DK		 4944}
4945
37f328eb 4946#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
24b58424
TT		 4947static inline void register_as_ext2(void)
4948{
4949 int err = register_filesystem(&ext2_fs_type);
4950 if (err)
4951 printk(KERN_WARNING
4952 "EXT4-fs: Unable to register as ext2 (%d)\n", err);
4953}
4954
4955static inline void unregister_as_ext2(void)
4956{
4957 unregister_filesystem(&ext2_fs_type);
4958}
2035e776
TT		 4959
4960static inline int ext2_feature_set_ok(struct super_block *sb)
4961{
4962 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP))
4963 return 0;
4964 if (sb->s_flags & MS_RDONLY)
4965 return 1;
4966 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))
4967 return 0;
4968 return 1;
4969}
51b7e3c9 4970MODULE_ALIAS("ext2");
24b58424
TT		 4971#else
4972static inline void register_as_ext2(void) { }
4973static inline void unregister_as_ext2(void) { }
2035e776 4974static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; }
24b58424
TT		 4975#endif
4976
37f328eb 4977#if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
24b58424
TT		 4978static inline void register_as_ext3(void)
4979{
4980 int err = register_filesystem(&ext3_fs_type);
4981 if (err)
4982 printk(KERN_WARNING
4983 "EXT4-fs: Unable to register as ext3 (%d)\n", err);
4984}
4985
4986static inline void unregister_as_ext3(void)
4987{
4988 unregister_filesystem(&ext3_fs_type);
4989}
2035e776
TT		 4990
4991static inline int ext3_feature_set_ok(struct super_block *sb)
4992{
4993 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP))
4994 return 0;
4995 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
4996 return 0;
4997 if (sb->s_flags & MS_RDONLY)
4998 return 1;
4999 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP))
5000 return 0;
5001 return 1;
5002}
51b7e3c9 5003MODULE_ALIAS("ext3");
24b58424
TT		 5004#else
5005static inline void register_as_ext3(void) { }
5006static inline void unregister_as_ext3(void) { }
2035e776 5007static inline int ext3_feature_set_ok(struct super_block *sb) { return 0; }
24b58424
TT		 5008#endif
5009
03010a33
TT		 5010static struct file_system_type ext4_fs_type = {
5011 .owner = THIS_MODULE,
5012 .name = "ext4",
152a0836 5013 .mount = ext4_mount,
03010a33
TT		 5014 .kill_sb = kill_block_super,
5015 .fs_flags = FS_REQUIRES_DEV,
5016};
5017
8f021222 5018static int __init ext4_init_feat_adverts(void)
857ac889
LC		 5019{
5020 struct ext4_features *ef;
5021 int ret = -ENOMEM;
5022
5023 ef = kzalloc(sizeof(struct ext4_features), GFP_KERNEL);
5024 if (!ef)
5025 goto out;
5026
5027 ef->f_kobj.kset = ext4_kset;
5028 init_completion(&ef->f_kobj_unregister);
5029 ret = kobject_init_and_add(&ef->f_kobj, &ext4_feat_ktype, NULL,
5030 "features");
5031 if (ret) {
5032 kfree(ef);
5033 goto out;
5034 }
5035
5036 ext4_feat = ef;
5037 ret = 0;
5038out:
5039 return ret;
5040}
5041
8f021222
LC		 5042static void ext4_exit_feat_adverts(void)
5043{
5044 kobject_put(&ext4_feat->f_kobj);
5045 wait_for_completion(&ext4_feat->f_kobj_unregister);
5046 kfree(ext4_feat);
5047}
5048
e9e3bcec
ES		 5049/* Shared across all ext4 file systems */
5050wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
5051struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ];
5052
5dabfc78 5053static int __init ext4_init_fs(void)
ac27a0ec 5054{
e9e3bcec 5055 int i, err;
c9de560d 5056
12e9b892 5057 ext4_check_flag_values();
e9e3bcec
ES		 5058
5059 for (i = 0; i < EXT4_WQ_HASH_SZ; i++) {
5060 mutex_init(&ext4__aio_mutex[i]);
5061 init_waitqueue_head(&ext4__ioend_wq[i]);
5062 }
5063
5dabfc78 5064 err = ext4_init_pageio();
6fd058f7
TT		 5065 if (err)
5066 return err;
5dabfc78 5067 err = ext4_init_system_zone();
bd2d0210 5068 if (err)
dd68314c 5069 goto out7;
3197ebdb
TT		 5070 ext4_kset = kset_create_and_add("ext4", NULL, fs_kobj);
5071 if (!ext4_kset)
dd68314c 5072 goto out6;
9f6200bb 5073 ext4_proc_root = proc_mkdir("fs/ext4", NULL);
dd68314c
TT		 5074 if (!ext4_proc_root)
5075 goto out5;
857ac889
LC		 5076
5077 err = ext4_init_feat_adverts();
dd68314c
TT		 5078 if (err)
5079 goto out4;
857ac889 5080
5dabfc78 5081 err = ext4_init_mballoc();
ac27a0ec 5082 if (err)
6fd058f7 5083 goto out3;
c9de560d 5084
5dabfc78 5085 err = ext4_init_xattr();
c9de560d
AT		 5086 if (err)
5087 goto out2;
ac27a0ec
DK		 5088 err = init_inodecache();
5089 if (err)
5090 goto out1;
24b58424 5091 register_as_ext3();
2035e776 5092 register_as_ext2();
03010a33 5093 err = register_filesystem(&ext4_fs_type);
ac27a0ec
DK		 5094 if (err)
5095 goto out;
bfff6873
LC		 5096
5097 ext4_li_info = NULL;
5098 mutex_init(&ext4_li_mtx);
ac27a0ec
DK		 5099 return 0;
5100out:
24b58424
TT		 5101 unregister_as_ext2();
5102 unregister_as_ext3();
ac27a0ec
DK		 5103 destroy_inodecache();
5104out1:
5dabfc78 5105 ext4_exit_xattr();
c9de560d 5106out2:
5dabfc78 5107 ext4_exit_mballoc();
6fd058f7 5108out3:
8f021222 5109 ext4_exit_feat_adverts();
dd68314c 5110out4:
6fd058f7 5111 remove_proc_entry("fs/ext4", NULL);
dd68314c 5112out5:
6fd058f7 5113 kset_unregister(ext4_kset);
dd68314c 5114out6:
5dabfc78 5115 ext4_exit_system_zone();
dd68314c 5116out7:
5dabfc78 5117 ext4_exit_pageio();
ac27a0ec
DK		 5118 return err;
5119}
5120
5dabfc78 5121static void __exit ext4_exit_fs(void)
ac27a0ec 5122{
bfff6873 5123 ext4_destroy_lazyinit_thread();
24b58424
TT		 5124 unregister_as_ext2();
5125 unregister_as_ext3();
03010a33 5126 unregister_filesystem(&ext4_fs_type);
ac27a0ec 5127 destroy_inodecache();
5dabfc78
TT		 5128 ext4_exit_xattr();
5129 ext4_exit_mballoc();
8f021222 5130 ext4_exit_feat_adverts();
9f6200bb 5131 remove_proc_entry("fs/ext4", NULL);
3197ebdb 5132 kset_unregister(ext4_kset);
5dabfc78
TT		 5133 ext4_exit_system_zone();
5134 ext4_exit_pageio();
ac27a0ec
DK		 5135}
5136
5137MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
83982b6f 5138MODULE_DESCRIPTION("Fourth Extended Filesystem");
ac27a0ec 5139MODULE_LICENSE("GPL");
5dabfc78
TT		 5140module_init(ext4_init_fs)
5141module_exit(ext4_exit_fs)
Linux kernel - Deliverables
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