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ext4: fix journal callback list traversal
[mirror_ubuntu-artful-kernel.git] / fs / ext4 / super.c
CommitLineData
ac27a0ec 1/*
617ba13b 2 * linux/fs/ext4/super.c
ac27a0ec
DK		 3 *
4 * Copyright (C) 1992, 1993, 1994, 1995
5 * Remy Card (card@masi.ibp.fr)
6 * Laboratoire MASI - Institut Blaise Pascal
7 * Universite Pierre et Marie Curie (Paris VI)
8 *
9 * from
10 *
11 * linux/fs/minix/inode.c
12 *
13 * Copyright (C) 1991, 1992 Linus Torvalds
14 *
15 * Big-endian to little-endian byte-swapping/bitmaps by
16 * David S. Miller (davem@caip.rutgers.edu), 1995
17 */
18
19#include <linux/module.h>
20#include <linux/string.h>
21#include <linux/fs.h>
22#include <linux/time.h>
c5ca7c76 23#include <linux/vmalloc.h>
dab291af 24#include <linux/jbd2.h>
ac27a0ec
DK		 25#include <linux/slab.h>
26#include <linux/init.h>
27#include <linux/blkdev.h>
28#include <linux/parser.h>
ac27a0ec 29#include <linux/buffer_head.h>
a5694255 30#include <linux/exportfs.h>
ac27a0ec
DK		 31#include <linux/vfs.h>
32#include <linux/random.h>
33#include <linux/mount.h>
34#include <linux/namei.h>
35#include <linux/quotaops.h>
36#include <linux/seq_file.h>
9f6200bb 37#include <linux/proc_fs.h>
3197ebdb 38#include <linux/ctype.h>
1330593e 39#include <linux/log2.h>
717d50e4 40#include <linux/crc16.h>
7abc52c2 41#include <linux/cleancache.h>
ac27a0ec
DK		 42#include <asm/uaccess.h>
43
bfff6873
LC		 44#include <linux/kthread.h>
45#include <linux/freezer.h>
46
3dcf5451 47#include "ext4.h"
4a092d73 48#include "ext4_extents.h" /* Needed for trace points definition */
3dcf5451 49#include "ext4_jbd2.h"
ac27a0ec
DK		 50#include "xattr.h"
51#include "acl.h"
3661d286 52#include "mballoc.h"
ac27a0ec 53
9bffad1e
TT		 54#define CREATE_TRACE_POINTS
55#include <trace/events/ext4.h>
56
1f109d5a 57static struct proc_dir_entry *ext4_proc_root;
3197ebdb 58static struct kset *ext4_kset;
0b75a840
LC		 59static struct ext4_lazy_init *ext4_li_info;
60static struct mutex ext4_li_mtx;
61static struct ext4_features *ext4_feat;
9f6200bb 62
617ba13b 63static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
ac27a0ec 64 unsigned long journal_devnum);
2adf6da8 65static int ext4_show_options(struct seq_file *seq, struct dentry *root);
e2d67052 66static int ext4_commit_super(struct super_block *sb, int sync);
2b2d6d01
TT		 67static void ext4_mark_recovery_complete(struct super_block *sb,
68 struct ext4_super_block *es);
69static void ext4_clear_journal_err(struct super_block *sb,
70 struct ext4_super_block *es);
617ba13b 71static int ext4_sync_fs(struct super_block *sb, int wait);
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);
c4be0c1d 75static int ext4_freeze(struct super_block *sb);
152a0836
AV		 76static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
77 const char *dev_name, void *data);
2035e776
TT		 78static inline int ext2_feature_set_ok(struct super_block *sb);
79static inline int ext3_feature_set_ok(struct super_block *sb);
d39195c3 80static int ext4_feature_set_ok(struct super_block *sb, int readonly);
bfff6873
LC		 81static void ext4_destroy_lazyinit_thread(void);
82static void ext4_unregister_li_request(struct super_block *sb);
8f1f7453 83static void ext4_clear_request_list(void);
ac27a0ec 84
2035e776
TT		 85#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
86static struct file_system_type ext2_fs_type = {
87 .owner = THIS_MODULE,
88 .name = "ext2",
89 .mount = ext4_mount,
90 .kill_sb = kill_block_super,
91 .fs_flags = FS_REQUIRES_DEV,
92};
7f78e035 93MODULE_ALIAS_FS("ext2");
fa7614dd 94MODULE_ALIAS("ext2");
2035e776
TT		 95#define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type)
96#else
97#define IS_EXT2_SB(sb) (0)
98#endif
99
100
ba69f9ab
JK		 101#if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
102static struct file_system_type ext3_fs_type = {
103 .owner = THIS_MODULE,
104 .name = "ext3",
152a0836 105 .mount = ext4_mount,
ba69f9ab
JK		 106 .kill_sb = kill_block_super,
107 .fs_flags = FS_REQUIRES_DEV,
108};
7f78e035 109MODULE_ALIAS_FS("ext3");
fa7614dd 110MODULE_ALIAS("ext3");
ba69f9ab
JK		 111#define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type)
112#else
113#define IS_EXT3_SB(sb) (0)
114#endif
bd81d8ee 115
d25425f8
DW		 116static int ext4_verify_csum_type(struct super_block *sb,
117 struct ext4_super_block *es)
118{
119 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
120 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
121 return 1;
122
123 return es->s_checksum_type == EXT4_CRC32C_CHKSUM;
124}
125
a9c47317
DW		 126static __le32 ext4_superblock_csum(struct super_block *sb,
127 struct ext4_super_block *es)
128{
129 struct ext4_sb_info *sbi = EXT4_SB(sb);
130 int offset = offsetof(struct ext4_super_block, s_checksum);
131 __u32 csum;
132
133 csum = ext4_chksum(sbi, ~0, (char *)es, offset);
134
135 return cpu_to_le32(csum);
136}
137
138int ext4_superblock_csum_verify(struct super_block *sb,
139 struct ext4_super_block *es)
140{
141 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
142 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
143 return 1;
144
145 return es->s_checksum == ext4_superblock_csum(sb, es);
146}
147
06db49e6 148void ext4_superblock_csum_set(struct super_block *sb)
a9c47317 149{
06db49e6
TT		 150 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
151
a9c47317
DW		 152 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
153 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
154 return;
155
156 es->s_checksum = ext4_superblock_csum(sb, es);
157}
158
9933fc0a
TT		 159void *ext4_kvmalloc(size_t size, gfp_t flags)
160{
161 void *ret;
162
163 ret = kmalloc(size, flags);
164 if (!ret)
165 ret = __vmalloc(size, flags, PAGE_KERNEL);
166 return ret;
167}
168
169void *ext4_kvzalloc(size_t size, gfp_t flags)
170{
171 void *ret;
172
db9481c0 173 ret = kzalloc(size, flags);
9933fc0a
TT		 174 if (!ret)
175 ret = __vmalloc(size, flags | __GFP_ZERO, PAGE_KERNEL);
176 return ret;
177}
178
179void ext4_kvfree(void *ptr)
180{
181 if (is_vmalloc_addr(ptr))
182 vfree(ptr);
183 else
184 kfree(ptr);
185
186}
187
8fadc143
AR		 188ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
189 struct ext4_group_desc *bg)
bd81d8ee 190{
3a14589c 191 return le32_to_cpu(bg->bg_block_bitmap_lo) |
8fadc143 192 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 193 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 194}
195
8fadc143
AR		 196ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
197 struct ext4_group_desc *bg)
bd81d8ee 198{
5272f837 199 return le32_to_cpu(bg->bg_inode_bitmap_lo) |
8fadc143 200 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 201 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 202}
203
8fadc143
AR		 204ext4_fsblk_t ext4_inode_table(struct super_block *sb,
205 struct ext4_group_desc *bg)
bd81d8ee 206{
5272f837 207 return le32_to_cpu(bg->bg_inode_table_lo) |
8fadc143 208 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 209 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
bd81d8ee
LV		 210}
211
021b65bb
TT		 212__u32 ext4_free_group_clusters(struct super_block *sb,
213 struct ext4_group_desc *bg)
560671a0
AK		 214{
215 return le16_to_cpu(bg->bg_free_blocks_count_lo) |
216 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 217 (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0);
560671a0
AK		 218}
219
220__u32 ext4_free_inodes_count(struct super_block *sb,
221 struct ext4_group_desc *bg)
222{
223 return le16_to_cpu(bg->bg_free_inodes_count_lo) |
224 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 225 (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0);
560671a0
AK		 226}
227
228__u32 ext4_used_dirs_count(struct super_block *sb,
229 struct ext4_group_desc *bg)
230{
231 return le16_to_cpu(bg->bg_used_dirs_count_lo) |
232 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 233 (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0);
560671a0
AK		 234}
235
236__u32 ext4_itable_unused_count(struct super_block *sb,
237 struct ext4_group_desc *bg)
238{
239 return le16_to_cpu(bg->bg_itable_unused_lo) |
240 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 241 (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0);
560671a0
AK		 242}
243
8fadc143
AR		 244void ext4_block_bitmap_set(struct super_block *sb,
245 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 246{
3a14589c 247 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 248 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
249 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 250}
251
8fadc143
AR		 252void ext4_inode_bitmap_set(struct super_block *sb,
253 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 254{
5272f837 255 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 256 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
257 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 258}
259
8fadc143
AR		 260void ext4_inode_table_set(struct super_block *sb,
261 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 262{
5272f837 263 bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 264 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
265 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 266}
267
021b65bb
TT		 268void ext4_free_group_clusters_set(struct super_block *sb,
269 struct ext4_group_desc *bg, __u32 count)
560671a0
AK		 270{
271 bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count);
272 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
273 bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16);
274}
275
276void ext4_free_inodes_set(struct super_block *sb,
277 struct ext4_group_desc *bg, __u32 count)
278{
279 bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count);
280 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
281 bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16);
282}
283
284void ext4_used_dirs_set(struct super_block *sb,
285 struct ext4_group_desc *bg, __u32 count)
286{
287 bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count);
288 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
289 bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16);
290}
291
292void ext4_itable_unused_set(struct super_block *sb,
293 struct ext4_group_desc *bg, __u32 count)
294{
295 bg->bg_itable_unused_lo = cpu_to_le16((__u16)count);
296 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
297 bg->bg_itable_unused_hi = cpu_to_le16(count >> 16);
298}
299
d3d1faf6 300
1c13d5c0
TT		 301static void __save_error_info(struct super_block *sb, const char *func,
302 unsigned int line)
303{
304 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
305
306 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
307 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
308 es->s_last_error_time = cpu_to_le32(get_seconds());
309 strncpy(es->s_last_error_func, func, sizeof(es->s_last_error_func));
310 es->s_last_error_line = cpu_to_le32(line);
311 if (!es->s_first_error_time) {
312 es->s_first_error_time = es->s_last_error_time;
313 strncpy(es->s_first_error_func, func,
314 sizeof(es->s_first_error_func));
315 es->s_first_error_line = cpu_to_le32(line);
316 es->s_first_error_ino = es->s_last_error_ino;
317 es->s_first_error_block = es->s_last_error_block;
318 }
66e61a9e
TT		 319 /*
320 * Start the daily error reporting function if it hasn't been
321 * started already
322 */
323 if (!es->s_error_count)
324 mod_timer(&EXT4_SB(sb)->s_err_report, jiffies + 24*60*60*HZ);
ba39ebb6 325 le32_add_cpu(&es->s_error_count, 1);
1c13d5c0
TT		 326}
327
328static void save_error_info(struct super_block *sb, const char *func,
329 unsigned int line)
330{
331 __save_error_info(sb, func, line);
332 ext4_commit_super(sb, 1);
333}
334
7c2e7087
TT		 335/*
336 * The del_gendisk() function uninitializes the disk-specific data
337 * structures, including the bdi structure, without telling anyone
338 * else. Once this happens, any attempt to call mark_buffer_dirty()
339 * (for example, by ext4_commit_super), will cause a kernel OOPS.
340 * This is a kludge to prevent these oops until we can put in a proper
341 * hook in del_gendisk() to inform the VFS and file system layers.
342 */
343static int block_device_ejected(struct super_block *sb)
344{
345 struct inode *bd_inode = sb->s_bdev->bd_inode;
346 struct backing_dev_info *bdi = bd_inode->i_mapping->backing_dev_info;
347
348 return bdi->dev == NULL;
349}
350
18aadd47
BJ		 351static void ext4_journal_commit_callback(journal_t *journal, transaction_t *txn)
352{
353 struct super_block *sb = journal->j_private;
354 struct ext4_sb_info *sbi = EXT4_SB(sb);
355 int error = is_journal_aborted(journal);
5d3ee208 356 struct ext4_journal_cb_entry *jce;
18aadd47 357
5d3ee208 358 BUG_ON(txn->t_state == T_FINISHED);
18aadd47 359 spin_lock(&sbi->s_md_lock);
5d3ee208
DM		 360 while (!list_empty(&txn->t_private_list)) {
361 jce = list_entry(txn->t_private_list.next,
362 struct ext4_journal_cb_entry, jce_list);
18aadd47
BJ		 363 list_del_init(&jce->jce_list);
364 spin_unlock(&sbi->s_md_lock);
365 jce->jce_func(sb, jce, error);
366 spin_lock(&sbi->s_md_lock);
367 }
368 spin_unlock(&sbi->s_md_lock);
369}
1c13d5c0 370
ac27a0ec
DK		 371/* Deal with the reporting of failure conditions on a filesystem such as
372 * inconsistencies detected or read IO failures.
373 *
374 * On ext2, we can store the error state of the filesystem in the
617ba13b 375 * superblock. That is not possible on ext4, because we may have other
ac27a0ec
DK		 376 * write ordering constraints on the superblock which prevent us from
377 * writing it out straight away; and given that the journal is about to
378 * be aborted, we can't rely on the current, or future, transactions to
379 * write out the superblock safely.
380 *
dab291af 381 * We'll just use the jbd2_journal_abort() error code to record an error in
d6b198bc 382 * the journal instead. On recovery, the journal will complain about
ac27a0ec
DK		 383 * that error until we've noted it down and cleared it.
384 */
385
617ba13b 386static void ext4_handle_error(struct super_block *sb)
ac27a0ec 387{
ac27a0ec
DK		 388 if (sb->s_flags & MS_RDONLY)
389 return;
390
2b2d6d01 391 if (!test_opt(sb, ERRORS_CONT)) {
617ba13b 392 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 393
4ab2f15b 394 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
ac27a0ec 395 if (journal)
dab291af 396 jbd2_journal_abort(journal, -EIO);
ac27a0ec 397 }
2b2d6d01 398 if (test_opt(sb, ERRORS_RO)) {
b31e1552 399 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
ac27a0ec
DK		 400 sb->s_flags |= MS_RDONLY;
401 }
ac27a0ec 402 if (test_opt(sb, ERRORS_PANIC))
617ba13b 403 panic("EXT4-fs (device %s): panic forced after error\n",
ac27a0ec
DK		 404 sb->s_id);
405}
406
12062ddd 407void __ext4_error(struct super_block *sb, const char *function,
c398eda0 408 unsigned int line, const char *fmt, ...)
ac27a0ec 409{
0ff2ea7d 410 struct va_format vaf;
ac27a0ec
DK		 411 va_list args;
412
413 va_start(args, fmt);
0ff2ea7d
JP		 414 vaf.fmt = fmt;
415 vaf.va = &args;
416 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n",
417 sb->s_id, function, line, current->comm, &vaf);
ac27a0ec 418 va_end(args);
f3fc0210 419 save_error_info(sb, function, line);
ac27a0ec 420
617ba13b 421 ext4_handle_error(sb);
ac27a0ec
DK		 422}
423
c398eda0
TT		 424void ext4_error_inode(struct inode *inode, const char *function,
425 unsigned int line, ext4_fsblk_t block,
273df556
FM		 426 const char *fmt, ...)
427{
428 va_list args;
f7c21177 429 struct va_format vaf;
1c13d5c0 430 struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
273df556 431
1c13d5c0
TT		 432 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
433 es->s_last_error_block = cpu_to_le64(block);
434 save_error_info(inode->i_sb, function, line);
273df556 435 va_start(args, fmt);
f7c21177
TT		 436 vaf.fmt = fmt;
437 vaf.va = &args;
c398eda0 438 if (block)
d9ee81da
JP		 439 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
440 "inode #%lu: block %llu: comm %s: %pV\n",
441 inode->i_sb->s_id, function, line, inode->i_ino,
442 block, current->comm, &vaf);
443 else
444 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
445 "inode #%lu: comm %s: %pV\n",
446 inode->i_sb->s_id, function, line, inode->i_ino,
447 current->comm, &vaf);
273df556
FM		 448 va_end(args);
449
450 ext4_handle_error(inode->i_sb);
451}
452
c398eda0 453void ext4_error_file(struct file *file, const char *function,
f7c21177
TT		 454 unsigned int line, ext4_fsblk_t block,
455 const char *fmt, ...)
273df556
FM		 456{
457 va_list args;
f7c21177 458 struct va_format vaf;
1c13d5c0 459 struct ext4_super_block *es;
496ad9aa 460 struct inode *inode = file_inode(file);
273df556
FM		 461 char pathname[80], *path;
462
1c13d5c0
TT		 463 es = EXT4_SB(inode->i_sb)->s_es;
464 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
465 save_error_info(inode->i_sb, function, line);
273df556 466 path = d_path(&(file->f_path), pathname, sizeof(pathname));
f9a62d09 467 if (IS_ERR(path))
273df556 468 path = "(unknown)";
f7c21177
TT		 469 va_start(args, fmt);
470 vaf.fmt = fmt;
471 vaf.va = &args;
d9ee81da
JP		 472 if (block)
473 printk(KERN_CRIT
474 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
475 "block %llu: comm %s: path %s: %pV\n",
476 inode->i_sb->s_id, function, line, inode->i_ino,
477 block, current->comm, path, &vaf);
478 else
479 printk(KERN_CRIT
480 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
481 "comm %s: path %s: %pV\n",
482 inode->i_sb->s_id, function, line, inode->i_ino,
483 current->comm, path, &vaf);
273df556
FM		 484 va_end(args);
485
486 ext4_handle_error(inode->i_sb);
487}
488
722887dd
TT		 489const char *ext4_decode_error(struct super_block *sb, int errno,
490 char nbuf[16])
ac27a0ec
DK		 491{
492 char *errstr = NULL;
493
494 switch (errno) {
495 case -EIO:
496 errstr = "IO failure";
497 break;
498 case -ENOMEM:
499 errstr = "Out of memory";
500 break;
501 case -EROFS:
78f1ddbb
TT		 502 if (!sb || (EXT4_SB(sb)->s_journal &&
503 EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT))
ac27a0ec
DK		 504 errstr = "Journal has aborted";
505 else
506 errstr = "Readonly filesystem";
507 break;
508 default:
509 /* If the caller passed in an extra buffer for unknown
510 * errors, textualise them now. Else we just return
511 * NULL. */
512 if (nbuf) {
513 /* Check for truncated error codes... */
514 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
515 errstr = nbuf;
516 }
517 break;
518 }
519
520 return errstr;
521}
522
617ba13b 523/* __ext4_std_error decodes expected errors from journaling functions
ac27a0ec
DK		 524 * automatically and invokes the appropriate error response. */
525
c398eda0
TT		 526void __ext4_std_error(struct super_block *sb, const char *function,
527 unsigned int line, int errno)
ac27a0ec
DK		 528{
529 char nbuf[16];
530 const char *errstr;
531
532 /* Special case: if the error is EROFS, and we're not already
533 * inside a transaction, then there's really no point in logging
534 * an error. */
535 if (errno == -EROFS && journal_current_handle() == NULL &&
536 (sb->s_flags & MS_RDONLY))
537 return;
538
617ba13b 539 errstr = ext4_decode_error(sb, errno, nbuf);
c398eda0
TT		 540 printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n",
541 sb->s_id, function, line, errstr);
1c13d5c0 542 save_error_info(sb, function, line);
ac27a0ec 543
617ba13b 544 ext4_handle_error(sb);
ac27a0ec
DK		 545}
546
547/*
617ba13b 548 * ext4_abort is a much stronger failure handler than ext4_error. The
ac27a0ec
DK		 549 * abort function may be used to deal with unrecoverable failures such
550 * as journal IO errors or ENOMEM at a critical moment in log management.
551 *
552 * We unconditionally force the filesystem into an ABORT|READONLY state,
553 * unless the error response on the fs has been set to panic in which
554 * case we take the easy way out and panic immediately.
555 */
556
c67d859e 557void __ext4_abort(struct super_block *sb, const char *function,
c398eda0 558 unsigned int line, const char *fmt, ...)
ac27a0ec
DK		 559{
560 va_list args;
561
1c13d5c0 562 save_error_info(sb, function, line);
ac27a0ec 563 va_start(args, fmt);
c398eda0
TT		 564 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: ", sb->s_id,
565 function, line);
ac27a0ec
DK		 566 vprintk(fmt, args);
567 printk("\n");
568 va_end(args);
569
1c13d5c0
TT		 570 if ((sb->s_flags & MS_RDONLY) == 0) {
571 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
572 sb->s_flags |= MS_RDONLY;
573 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
574 if (EXT4_SB(sb)->s_journal)
575 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
576 save_error_info(sb, function, line);
577 }
ac27a0ec 578 if (test_opt(sb, ERRORS_PANIC))
617ba13b 579 panic("EXT4-fs panic from previous error\n");
ac27a0ec
DK		 580}
581
0ff2ea7d 582void ext4_msg(struct super_block *sb, const char *prefix, const char *fmt, ...)
b31e1552 583{
0ff2ea7d 584 struct va_format vaf;
b31e1552
ES		 585 va_list args;
586
587 va_start(args, fmt);
0ff2ea7d
JP		 588 vaf.fmt = fmt;
589 vaf.va = &args;
590 printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
b31e1552
ES		 591 va_end(args);
592}
593
12062ddd 594void __ext4_warning(struct super_block *sb, const char *function,
c398eda0 595 unsigned int line, const char *fmt, ...)
ac27a0ec 596{
0ff2ea7d 597 struct va_format vaf;
ac27a0ec
DK		 598 va_list args;
599
600 va_start(args, fmt);
0ff2ea7d
JP		 601 vaf.fmt = fmt;
602 vaf.va = &args;
603 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: %pV\n",
604 sb->s_id, function, line, &vaf);
ac27a0ec
DK		 605 va_end(args);
606}
607
e29136f8
TT		 608void __ext4_grp_locked_error(const char *function, unsigned int line,
609 struct super_block *sb, ext4_group_t grp,
610 unsigned long ino, ext4_fsblk_t block,
611 const char *fmt, ...)
5d1b1b3f
AK		 612__releases(bitlock)
613__acquires(bitlock)
614{
0ff2ea7d 615 struct va_format vaf;
5d1b1b3f
AK		 616 va_list args;
617 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
618
1c13d5c0
TT		 619 es->s_last_error_ino = cpu_to_le32(ino);
620 es->s_last_error_block = cpu_to_le64(block);
621 __save_error_info(sb, function, line);
0ff2ea7d 622
5d1b1b3f 623 va_start(args, fmt);
0ff2ea7d
JP		 624
625 vaf.fmt = fmt;
626 vaf.va = &args;
21149d61 627 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u, ",
e29136f8
TT		 628 sb->s_id, function, line, grp);
629 if (ino)
0ff2ea7d 630 printk(KERN_CONT "inode %lu: ", ino);
e29136f8 631 if (block)
0ff2ea7d
JP		 632 printk(KERN_CONT "block %llu:", (unsigned long long) block);
633 printk(KERN_CONT "%pV\n", &vaf);
5d1b1b3f
AK		 634 va_end(args);
635
636 if (test_opt(sb, ERRORS_CONT)) {
e2d67052 637 ext4_commit_super(sb, 0);
5d1b1b3f
AK		 638 return;
639 }
1c13d5c0 640
5d1b1b3f
AK		 641 ext4_unlock_group(sb, grp);
642 ext4_handle_error(sb);
643 /*
644 * We only get here in the ERRORS_RO case; relocking the group
645 * may be dangerous, but nothing bad will happen since the
646 * filesystem will have already been marked read/only and the
647 * journal has been aborted. We return 1 as a hint to callers
648 * who might what to use the return value from
25985edc 649 * ext4_grp_locked_error() to distinguish between the
5d1b1b3f
AK		 650 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
651 * aggressively from the ext4 function in question, with a
652 * more appropriate error code.
653 */
654 ext4_lock_group(sb, grp);
655 return;
656}
657
617ba13b 658void ext4_update_dynamic_rev(struct super_block *sb)
ac27a0ec 659{
617ba13b 660 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
ac27a0ec 661
617ba13b 662 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
ac27a0ec
DK		 663 return;
664
12062ddd 665 ext4_warning(sb,
ac27a0ec
DK		 666 "updating to rev %d because of new feature flag, "
667 "running e2fsck is recommended",
617ba13b 668 EXT4_DYNAMIC_REV);
ac27a0ec 669
617ba13b
MC		 670 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
671 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
672 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
ac27a0ec
DK		 673 /* leave es->s_feature_*compat flags alone */
674 /* es->s_uuid will be set by e2fsck if empty */
675
676 /*
677 * The rest of the superblock fields should be zero, and if not it
678 * means they are likely already in use, so leave them alone. We
679 * can leave it up to e2fsck to clean up any inconsistencies there.
680 */
681}
682
683/*
684 * Open the external journal device
685 */
b31e1552 686static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb)
ac27a0ec
DK		 687{
688 struct block_device *bdev;
689 char b[BDEVNAME_SIZE];
690
d4d77629 691 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
ac27a0ec
DK		 692 if (IS_ERR(bdev))
693 goto fail;
694 return bdev;
695
696fail:
b31e1552 697 ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld",
ac27a0ec
DK		 698 __bdevname(dev, b), PTR_ERR(bdev));
699 return NULL;
700}
701
702/*
703 * Release the journal device
704 */
617ba13b 705static int ext4_blkdev_put(struct block_device *bdev)
ac27a0ec 706{
e525fd89 707 return blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
ac27a0ec
DK		 708}
709
617ba13b 710static int ext4_blkdev_remove(struct ext4_sb_info *sbi)
ac27a0ec
DK		 711{
712 struct block_device *bdev;
713 int ret = -ENODEV;
714
715 bdev = sbi->journal_bdev;
716 if (bdev) {
617ba13b 717 ret = ext4_blkdev_put(bdev);
ac27a0ec
DK		 718 sbi->journal_bdev = NULL;
719 }
720 return ret;
721}
722
723static inline struct inode *orphan_list_entry(struct list_head *l)
724{
617ba13b 725 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
ac27a0ec
DK		 726}
727
617ba13b 728static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
ac27a0ec
DK		 729{
730 struct list_head *l;
731
b31e1552
ES		 732 ext4_msg(sb, KERN_ERR, "sb orphan head is %d",
733 le32_to_cpu(sbi->s_es->s_last_orphan));
ac27a0ec
DK		 734
735 printk(KERN_ERR "sb_info orphan list:\n");
736 list_for_each(l, &sbi->s_orphan) {
737 struct inode *inode = orphan_list_entry(l);
738 printk(KERN_ERR " "
739 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
740 inode->i_sb->s_id, inode->i_ino, inode,
741 inode->i_mode, inode->i_nlink,
742 NEXT_ORPHAN(inode));
743 }
744}
745
2b2d6d01 746static void ext4_put_super(struct super_block *sb)
ac27a0ec 747{
617ba13b
MC		 748 struct ext4_sb_info *sbi = EXT4_SB(sb);
749 struct ext4_super_block *es = sbi->s_es;
ef2cabf7 750 int i, err;
ac27a0ec 751
857ac889 752 ext4_unregister_li_request(sb);
e0ccfd95
CH		 753 dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
754
4c0425ff
MC		 755 flush_workqueue(sbi->dio_unwritten_wq);
756 destroy_workqueue(sbi->dio_unwritten_wq);
757
0390131b
FM		 758 if (sbi->s_journal) {
759 err = jbd2_journal_destroy(sbi->s_journal);
760 sbi->s_journal = NULL;
761 if (err < 0)
c67d859e 762 ext4_abort(sb, "Couldn't clean up the journal");
0390131b 763 }
d4edac31 764
74cd15cd 765 ext4_es_unregister_shrinker(sb);
a1c6c569 766 del_timer(&sbi->s_err_report);
d4edac31
JB		 767 ext4_release_system_zone(sb);
768 ext4_mb_release(sb);
769 ext4_ext_release(sb);
770 ext4_xattr_put_super(sb);
771
ac27a0ec 772 if (!(sb->s_flags & MS_RDONLY)) {
617ba13b 773 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
ac27a0ec 774 es->s_state = cpu_to_le16(sbi->s_mount_state);
ac27a0ec 775 }
58c5873a 776 if (!(sb->s_flags & MS_RDONLY))
a8e25a83
AB		 777 ext4_commit_super(sb, 1);
778
240799cd 779 if (sbi->s_proc) {
66acdcf4 780 remove_proc_entry("options", sbi->s_proc);
9f6200bb 781 remove_proc_entry(sb->s_id, ext4_proc_root);
240799cd 782 }
3197ebdb 783 kobject_del(&sbi->s_kobj);
ac27a0ec
DK		 784
785 for (i = 0; i < sbi->s_gdb_count; i++)
786 brelse(sbi->s_group_desc[i]);
f18a5f21 787 ext4_kvfree(sbi->s_group_desc);
9933fc0a 788 ext4_kvfree(sbi->s_flex_groups);
57042651 789 percpu_counter_destroy(&sbi->s_freeclusters_counter);
ac27a0ec
DK		 790 percpu_counter_destroy(&sbi->s_freeinodes_counter);
791 percpu_counter_destroy(&sbi->s_dirs_counter);
57042651 792 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
1ac6466f 793 percpu_counter_destroy(&sbi->s_extent_cache_cnt);
ac27a0ec
DK		 794 brelse(sbi->s_sbh);
795#ifdef CONFIG_QUOTA
796 for (i = 0; i < MAXQUOTAS; i++)
797 kfree(sbi->s_qf_names[i]);
798#endif
799
800 /* Debugging code just in case the in-memory inode orphan list
801 * isn't empty. The on-disk one can be non-empty if we've
802 * detected an error and taken the fs readonly, but the
803 * in-memory list had better be clean by this point. */
804 if (!list_empty(&sbi->s_orphan))
805 dump_orphan_list(sb, sbi);
806 J_ASSERT(list_empty(&sbi->s_orphan));
807
f98393a6 808 invalidate_bdev(sb->s_bdev);
ac27a0ec
DK		 809 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
810 /*
811 * Invalidate the journal device's buffers. We don't want them
812 * floating about in memory - the physical journal device may
813 * hotswapped, and it breaks the `ro-after' testing code.
814 */
815 sync_blockdev(sbi->journal_bdev);
f98393a6 816 invalidate_bdev(sbi->journal_bdev);
617ba13b 817 ext4_blkdev_remove(sbi);
ac27a0ec 818 }
c5e06d10
JL		 819 if (sbi->s_mmp_tsk)
820 kthread_stop(sbi->s_mmp_tsk);
ac27a0ec 821 sb->s_fs_info = NULL;
3197ebdb
TT		 822 /*
823 * Now that we are completely done shutting down the
824 * superblock, we need to actually destroy the kobject.
825 */
3197ebdb
TT		 826 kobject_put(&sbi->s_kobj);
827 wait_for_completion(&sbi->s_kobj_unregister);
0441984a
DW		 828 if (sbi->s_chksum_driver)
829 crypto_free_shash(sbi->s_chksum_driver);
705895b6 830 kfree(sbi->s_blockgroup_lock);
ac27a0ec 831 kfree(sbi);
ac27a0ec
DK		 832}
833
e18b890b 834static struct kmem_cache *ext4_inode_cachep;
ac27a0ec
DK		 835
836/*
837 * Called inside transaction, so use GFP_NOFS
838 */
617ba13b 839static struct inode *ext4_alloc_inode(struct super_block *sb)
ac27a0ec 840{
617ba13b 841 struct ext4_inode_info *ei;
ac27a0ec 842
e6b4f8da 843 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
ac27a0ec
DK		 844 if (!ei)
845 return NULL;
0b8e58a1 846
ac27a0ec 847 ei->vfs_inode.i_version = 1;
c9de560d
AT		 848 INIT_LIST_HEAD(&ei->i_prealloc_list);
849 spin_lock_init(&ei->i_prealloc_lock);
9a26b661
ZL		 850 ext4_es_init_tree(&ei->i_es_tree);
851 rwlock_init(&ei->i_es_lock);
74cd15cd
ZL		 852 INIT_LIST_HEAD(&ei->i_es_lru);
853 ei->i_es_lru_nr = 0;
d2a17637
MC		 854 ei->i_reserved_data_blocks = 0;
855 ei->i_reserved_meta_blocks = 0;
856 ei->i_allocated_meta_blocks = 0;
9d0be502 857 ei->i_da_metadata_calc_len = 0;
7e731bc9 858 ei->i_da_metadata_calc_last_lblock = 0;
d2a17637 859 spin_lock_init(&(ei->i_block_reservation_lock));
a9e7f447
DM		 860#ifdef CONFIG_QUOTA
861 ei->i_reserved_quota = 0;
862#endif
8aefcd55 863 ei->jinode = NULL;
c7064ef1 864 INIT_LIST_HEAD(&ei->i_completed_io_list);
744692dc 865 spin_lock_init(&ei->i_completed_io_lock);
b436b9be
JK		 866 ei->i_sync_tid = 0;
867 ei->i_datasync_tid = 0;
f7ad6d2e 868 atomic_set(&ei->i_ioend_count, 0);
e27f41e1 869 atomic_set(&ei->i_unwritten, 0);
84c17543 870 INIT_WORK(&ei->i_unwritten_work, ext4_end_io_work);
0b8e58a1 871
ac27a0ec
DK		 872 return &ei->vfs_inode;
873}
874
7ff9c073
TT		 875static int ext4_drop_inode(struct inode *inode)
876{
877 int drop = generic_drop_inode(inode);
878
879 trace_ext4_drop_inode(inode, drop);
880 return drop;
881}
882
fa0d7e3d
NP		 883static void ext4_i_callback(struct rcu_head *head)
884{
885 struct inode *inode = container_of(head, struct inode, i_rcu);
fa0d7e3d
NP		 886 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
887}
888
617ba13b 889static void ext4_destroy_inode(struct inode *inode)
ac27a0ec 890{
9f7dd93d 891 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
b31e1552
ES		 892 ext4_msg(inode->i_sb, KERN_ERR,
893 "Inode %lu (%p): orphan list check failed!",
894 inode->i_ino, EXT4_I(inode));
9f7dd93d
VA		 895 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
896 EXT4_I(inode), sizeof(struct ext4_inode_info),
897 true);
898 dump_stack();
899 }
fa0d7e3d 900 call_rcu(&inode->i_rcu, ext4_i_callback);
ac27a0ec
DK		 901}
902
51cc5068 903static void init_once(void *foo)
ac27a0ec 904{
617ba13b 905 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
ac27a0ec 906
a35afb83 907 INIT_LIST_HEAD(&ei->i_orphan);
a35afb83 908 init_rwsem(&ei->xattr_sem);
0e855ac8 909 init_rwsem(&ei->i_data_sem);
a35afb83 910 inode_init_once(&ei->vfs_inode);
ac27a0ec
DK		 911}
912
913static int init_inodecache(void)
914{
617ba13b
MC		 915 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
916 sizeof(struct ext4_inode_info),
ac27a0ec
DK		 917 0, (SLAB_RECLAIM_ACCOUNT|
918 SLAB_MEM_SPREAD),
20c2df83 919 init_once);
617ba13b 920 if (ext4_inode_cachep == NULL)
ac27a0ec
DK		 921 return -ENOMEM;
922 return 0;
923}
924
925static void destroy_inodecache(void)
926{
8c0a8537
KS		 927 /*
928 * Make sure all delayed rcu free inodes are flushed before we
929 * destroy cache.
930 */
931 rcu_barrier();
617ba13b 932 kmem_cache_destroy(ext4_inode_cachep);
ac27a0ec
DK		 933}
934
0930fcc1 935void ext4_clear_inode(struct inode *inode)
ac27a0ec 936{
0930fcc1 937 invalidate_inode_buffers(inode);
dbd5768f 938 clear_inode(inode);
9f754758 939 dquot_drop(inode);
c2ea3fde 940 ext4_discard_preallocations(inode);
51865fda 941 ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS);
74cd15cd 942 ext4_es_lru_del(inode);
8aefcd55
TT		 943 if (EXT4_I(inode)->jinode) {
944 jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode),
945 EXT4_I(inode)->jinode);
946 jbd2_free_inode(EXT4_I(inode)->jinode);
947 EXT4_I(inode)->jinode = NULL;
948 }
ac27a0ec
DK		 949}
950
1b961ac0 951static struct inode *ext4_nfs_get_inode(struct super_block *sb,
0b8e58a1 952 u64 ino, u32 generation)
ac27a0ec 953{
ac27a0ec 954 struct inode *inode;
ac27a0ec 955
617ba13b 956 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
ac27a0ec 957 return ERR_PTR(-ESTALE);
617ba13b 958 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
ac27a0ec
DK		 959 return ERR_PTR(-ESTALE);
960
961 /* iget isn't really right if the inode is currently unallocated!!
962 *
617ba13b 963 * ext4_read_inode will return a bad_inode if the inode had been
ac27a0ec
DK		 964 * deleted, so we should be safe.
965 *
966 * Currently we don't know the generation for parent directory, so
967 * a generation of 0 means "accept any"
968 */
1d1fe1ee
DH		 969 inode = ext4_iget(sb, ino);
970 if (IS_ERR(inode))
971 return ERR_CAST(inode);
972 if (generation && inode->i_generation != generation) {
ac27a0ec
DK		 973 iput(inode);
974 return ERR_PTR(-ESTALE);
975 }
1b961ac0
CH		 976
977 return inode;
978}
979
980static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
0b8e58a1 981 int fh_len, int fh_type)
1b961ac0
CH		 982{
983 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
984 ext4_nfs_get_inode);
985}
986
987static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
0b8e58a1 988 int fh_len, int fh_type)
1b961ac0
CH		 989{
990 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
991 ext4_nfs_get_inode);
ac27a0ec
DK		 992}
993
c39a7f84
TO		 994/*
995 * Try to release metadata pages (indirect blocks, directories) which are
996 * mapped via the block device. Since these pages could have journal heads
997 * which would prevent try_to_free_buffers() from freeing them, we must use
998 * jbd2 layer's try_to_free_buffers() function to release them.
999 */
0b8e58a1
AD		 1000static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
1001 gfp_t wait)
c39a7f84
TO		 1002{
1003 journal_t *journal = EXT4_SB(sb)->s_journal;
1004
1005 WARN_ON(PageChecked(page));
1006 if (!page_has_buffers(page))
1007 return 0;
1008 if (journal)
1009 return jbd2_journal_try_to_free_buffers(journal, page,
1010 wait & ~__GFP_WAIT);
1011 return try_to_free_buffers(page);
1012}
1013
ac27a0ec 1014#ifdef CONFIG_QUOTA
af5bc92d 1015#define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
2b2d6d01 1016#define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
ac27a0ec 1017
617ba13b
MC		 1018static int ext4_write_dquot(struct dquot *dquot);
1019static int ext4_acquire_dquot(struct dquot *dquot);
1020static int ext4_release_dquot(struct dquot *dquot);
1021static int ext4_mark_dquot_dirty(struct dquot *dquot);
1022static int ext4_write_info(struct super_block *sb, int type);
6f28e087 1023static int ext4_quota_on(struct super_block *sb, int type, int format_id,
f00c9e44 1024 struct path *path);
7c319d32
AK		 1025static int ext4_quota_on_sysfile(struct super_block *sb, int type,
1026 int format_id);
ca0e05e4 1027static int ext4_quota_off(struct super_block *sb, int type);
7c319d32 1028static int ext4_quota_off_sysfile(struct super_block *sb, int type);
617ba13b
MC		 1029static int ext4_quota_on_mount(struct super_block *sb, int type);
1030static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec 1031 size_t len, loff_t off);
617ba13b 1032static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec 1033 const char *data, size_t len, loff_t off);
7c319d32
AK		 1034static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
1035 unsigned int flags);
1036static int ext4_enable_quotas(struct super_block *sb);
ac27a0ec 1037
61e225dc 1038static const struct dquot_operations ext4_quota_operations = {
60e58e0f 1039 .get_reserved_space = ext4_get_reserved_space,
617ba13b
MC		 1040 .write_dquot = ext4_write_dquot,
1041 .acquire_dquot = ext4_acquire_dquot,
1042 .release_dquot = ext4_release_dquot,
1043 .mark_dirty = ext4_mark_dquot_dirty,
a5b5ee32
JK		 1044 .write_info = ext4_write_info,
1045 .alloc_dquot = dquot_alloc,
1046 .destroy_dquot = dquot_destroy,
ac27a0ec
DK		 1047};
1048
0d54b217 1049static const struct quotactl_ops ext4_qctl_operations = {
617ba13b 1050 .quota_on = ext4_quota_on,
ca0e05e4 1051 .quota_off = ext4_quota_off,
287a8095
CH		 1052 .quota_sync = dquot_quota_sync,
1053 .get_info = dquot_get_dqinfo,
1054 .set_info = dquot_set_dqinfo,
1055 .get_dqblk = dquot_get_dqblk,
1056 .set_dqblk = dquot_set_dqblk
ac27a0ec 1057};
7c319d32
AK		 1058
1059static const struct quotactl_ops ext4_qctl_sysfile_operations = {
1060 .quota_on_meta = ext4_quota_on_sysfile,
1061 .quota_off = ext4_quota_off_sysfile,
1062 .quota_sync = dquot_quota_sync,
1063 .get_info = dquot_get_dqinfo,
1064 .set_info = dquot_set_dqinfo,
1065 .get_dqblk = dquot_get_dqblk,
1066 .set_dqblk = dquot_set_dqblk
1067};
ac27a0ec
DK		 1068#endif
1069
ee9b6d61 1070static const struct super_operations ext4_sops = {
617ba13b
MC		 1071 .alloc_inode = ext4_alloc_inode,
1072 .destroy_inode = ext4_destroy_inode,
617ba13b
MC		 1073 .write_inode = ext4_write_inode,
1074 .dirty_inode = ext4_dirty_inode,
7ff9c073 1075 .drop_inode = ext4_drop_inode,
0930fcc1 1076 .evict_inode = ext4_evict_inode,
617ba13b 1077 .put_super = ext4_put_super,
617ba13b 1078 .sync_fs = ext4_sync_fs,
c4be0c1d
TS		 1079 .freeze_fs = ext4_freeze,
1080 .unfreeze_fs = ext4_unfreeze,
617ba13b
MC		 1081 .statfs = ext4_statfs,
1082 .remount_fs = ext4_remount,
617ba13b 1083 .show_options = ext4_show_options,
ac27a0ec 1084#ifdef CONFIG_QUOTA
617ba13b
MC		 1085 .quota_read = ext4_quota_read,
1086 .quota_write = ext4_quota_write,
ac27a0ec 1087#endif
c39a7f84 1088 .bdev_try_to_free_page = bdev_try_to_free_page,
ac27a0ec
DK		 1089};
1090
9ca92389
TT		 1091static const struct super_operations ext4_nojournal_sops = {
1092 .alloc_inode = ext4_alloc_inode,
1093 .destroy_inode = ext4_destroy_inode,
1094 .write_inode = ext4_write_inode,
1095 .dirty_inode = ext4_dirty_inode,
7ff9c073 1096 .drop_inode = ext4_drop_inode,
0930fcc1 1097 .evict_inode = ext4_evict_inode,
9ca92389
TT		 1098 .put_super = ext4_put_super,
1099 .statfs = ext4_statfs,
1100 .remount_fs = ext4_remount,
9ca92389
TT		 1101 .show_options = ext4_show_options,
1102#ifdef CONFIG_QUOTA
1103 .quota_read = ext4_quota_read,
1104 .quota_write = ext4_quota_write,
1105#endif
1106 .bdev_try_to_free_page = bdev_try_to_free_page,
1107};
1108
39655164 1109static const struct export_operations ext4_export_ops = {
1b961ac0
CH		 1110 .fh_to_dentry = ext4_fh_to_dentry,
1111 .fh_to_parent = ext4_fh_to_parent,
617ba13b 1112 .get_parent = ext4_get_parent,
ac27a0ec
DK		 1113};
1114
1115enum {
1116 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
1117 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
72578c33 1118 Opt_nouid32, Opt_debug, Opt_removed,
ac27a0ec 1119 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
72578c33 1120 Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload,
30773840 1121 Opt_commit, Opt_min_batch_time, Opt_max_batch_time,
43e625d8 1122 Opt_journal_dev, Opt_journal_checksum, Opt_journal_async_commit,
ac27a0ec 1123 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
296c355c 1124 Opt_data_err_abort, Opt_data_err_ignore,
ac27a0ec 1125 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
5a20bdfc 1126 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
ee4a3fcd 1127 Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err,
661aa520 1128 Opt_usrquota, Opt_grpquota, Opt_i_version,
1449032b
TT		 1129 Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_mblk_io_submit,
1130 Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity,
5328e635 1131 Opt_inode_readahead_blks, Opt_journal_ioprio,
744692dc 1132 Opt_dioread_nolock, Opt_dioread_lock,
fc6cb1cd 1133 Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable,
df981d03 1134 Opt_max_dir_size_kb,
ac27a0ec
DK		 1135};
1136
a447c093 1137static const match_table_t tokens = {
ac27a0ec
DK		 1138 {Opt_bsd_df, "bsddf"},
1139 {Opt_minix_df, "minixdf"},
1140 {Opt_grpid, "grpid"},
1141 {Opt_grpid, "bsdgroups"},
1142 {Opt_nogrpid, "nogrpid"},
1143 {Opt_nogrpid, "sysvgroups"},
1144 {Opt_resgid, "resgid=%u"},
1145 {Opt_resuid, "resuid=%u"},
1146 {Opt_sb, "sb=%u"},
1147 {Opt_err_cont, "errors=continue"},
1148 {Opt_err_panic, "errors=panic"},
1149 {Opt_err_ro, "errors=remount-ro"},
1150 {Opt_nouid32, "nouid32"},
ac27a0ec 1151 {Opt_debug, "debug"},
72578c33
TT		 1152 {Opt_removed, "oldalloc"},
1153 {Opt_removed, "orlov"},
ac27a0ec
DK		 1154 {Opt_user_xattr, "user_xattr"},
1155 {Opt_nouser_xattr, "nouser_xattr"},
1156 {Opt_acl, "acl"},
1157 {Opt_noacl, "noacl"},
e3bb52ae 1158 {Opt_noload, "norecovery"},
5a916be1 1159 {Opt_noload, "noload"},
72578c33
TT		 1160 {Opt_removed, "nobh"},
1161 {Opt_removed, "bh"},
ac27a0ec 1162 {Opt_commit, "commit=%u"},
30773840
TT		 1163 {Opt_min_batch_time, "min_batch_time=%u"},
1164 {Opt_max_batch_time, "max_batch_time=%u"},
ac27a0ec 1165 {Opt_journal_dev, "journal_dev=%u"},
818d276c
GS		 1166 {Opt_journal_checksum, "journal_checksum"},
1167 {Opt_journal_async_commit, "journal_async_commit"},
ac27a0ec
DK		 1168 {Opt_abort, "abort"},
1169 {Opt_data_journal, "data=journal"},
1170 {Opt_data_ordered, "data=ordered"},
1171 {Opt_data_writeback, "data=writeback"},
5bf5683a
HK		 1172 {Opt_data_err_abort, "data_err=abort"},
1173 {Opt_data_err_ignore, "data_err=ignore"},
ac27a0ec
DK		 1174 {Opt_offusrjquota, "usrjquota="},
1175 {Opt_usrjquota, "usrjquota=%s"},
1176 {Opt_offgrpjquota, "grpjquota="},
1177 {Opt_grpjquota, "grpjquota=%s"},
1178 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
1179 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
5a20bdfc 1180 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
ac27a0ec
DK		 1181 {Opt_grpquota, "grpquota"},
1182 {Opt_noquota, "noquota"},
1183 {Opt_quota, "quota"},
1184 {Opt_usrquota, "usrquota"},
1185 {Opt_barrier, "barrier=%u"},
06705bff
TT		 1186 {Opt_barrier, "barrier"},
1187 {Opt_nobarrier, "nobarrier"},
25ec56b5 1188 {Opt_i_version, "i_version"},
c9de560d 1189 {Opt_stripe, "stripe=%u"},
64769240 1190 {Opt_delalloc, "delalloc"},
dd919b98 1191 {Opt_nodelalloc, "nodelalloc"},
36ade451
JK		 1192 {Opt_removed, "mblk_io_submit"},
1193 {Opt_removed, "nomblk_io_submit"},
6fd058f7
TT		 1194 {Opt_block_validity, "block_validity"},
1195 {Opt_noblock_validity, "noblock_validity"},
240799cd 1196 {Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
b3881f74 1197 {Opt_journal_ioprio, "journal_ioprio=%u"},
afd4672d 1198 {Opt_auto_da_alloc, "auto_da_alloc=%u"},
06705bff
TT		 1199 {Opt_auto_da_alloc, "auto_da_alloc"},
1200 {Opt_noauto_da_alloc, "noauto_da_alloc"},
744692dc
JZ		 1201 {Opt_dioread_nolock, "dioread_nolock"},
1202 {Opt_dioread_lock, "dioread_lock"},
5328e635
ES		 1203 {Opt_discard, "discard"},
1204 {Opt_nodiscard, "nodiscard"},
fc6cb1cd
TT		 1205 {Opt_init_itable, "init_itable=%u"},
1206 {Opt_init_itable, "init_itable"},
1207 {Opt_noinit_itable, "noinit_itable"},
df981d03 1208 {Opt_max_dir_size_kb, "max_dir_size_kb=%u"},
c7198b9c
TT		 1209 {Opt_removed, "check=none"}, /* mount option from ext2/3 */
1210 {Opt_removed, "nocheck"}, /* mount option from ext2/3 */
1211 {Opt_removed, "reservation"}, /* mount option from ext2/3 */
1212 {Opt_removed, "noreservation"}, /* mount option from ext2/3 */
1213 {Opt_removed, "journal=%u"}, /* mount option from ext2/3 */
f3f12faa 1214 {Opt_err, NULL},
ac27a0ec
DK		 1215};
1216
617ba13b 1217static ext4_fsblk_t get_sb_block(void **data)
ac27a0ec 1218{
617ba13b 1219 ext4_fsblk_t sb_block;
ac27a0ec
DK		 1220 char *options = (char *) *data;
1221
1222 if (!options || strncmp(options, "sb=", 3) != 0)
1223 return 1; /* Default location */
0b8e58a1 1224
ac27a0ec 1225 options += 3;
0b8e58a1 1226 /* TODO: use simple_strtoll with >32bit ext4 */
ac27a0ec
DK		 1227 sb_block = simple_strtoul(options, &options, 0);
1228 if (*options && *options != ',') {
4776004f 1229 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
ac27a0ec
DK		 1230 (char *) *data);
1231 return 1;
1232 }
1233 if (*options == ',')
1234 options++;
1235 *data = (void *) options;
0b8e58a1 1236
ac27a0ec
DK		 1237 return sb_block;
1238}
1239
b3881f74 1240#define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
437ca0fd
DM		 1241static char deprecated_msg[] = "Mount option \"%s\" will be removed by %s\n"
1242 "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
b3881f74 1243
56c50f11
DM		 1244#ifdef CONFIG_QUOTA
1245static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
1246{
1247 struct ext4_sb_info *sbi = EXT4_SB(sb);
1248 char *qname;
03dafb5f 1249 int ret = -1;
56c50f11
DM		 1250
1251 if (sb_any_quota_loaded(sb) &&
1252 !sbi->s_qf_names[qtype]) {
1253 ext4_msg(sb, KERN_ERR,
1254 "Cannot change journaled "
1255 "quota options when quota turned on");
57f73c2c 1256 return -1;
56c50f11 1257 }
262b4662
JK		 1258 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA)) {
1259 ext4_msg(sb, KERN_ERR, "Cannot set journaled quota options "
1260 "when QUOTA feature is enabled");
1261 return -1;
1262 }
56c50f11
DM		 1263 qname = match_strdup(args);
1264 if (!qname) {
1265 ext4_msg(sb, KERN_ERR,
1266 "Not enough memory for storing quotafile name");
57f73c2c 1267 return -1;
56c50f11 1268 }
03dafb5f
CG		 1269 if (sbi->s_qf_names[qtype]) {
1270 if (strcmp(sbi->s_qf_names[qtype], qname) == 0)
1271 ret = 1;
1272 else
1273 ext4_msg(sb, KERN_ERR,
1274 "%s quota file already specified",
1275 QTYPE2NAME(qtype));
1276 goto errout;
56c50f11 1277 }
03dafb5f 1278 if (strchr(qname, '/')) {
56c50f11
DM		 1279 ext4_msg(sb, KERN_ERR,
1280 "quotafile must be on filesystem root");
03dafb5f 1281 goto errout;
56c50f11 1282 }
03dafb5f 1283 sbi->s_qf_names[qtype] = qname;
fd8c37ec 1284 set_opt(sb, QUOTA);
56c50f11 1285 return 1;
03dafb5f
CG		 1286errout:
1287 kfree(qname);
1288 return ret;
56c50f11
DM		 1289}
1290
1291static int clear_qf_name(struct super_block *sb, int qtype)
1292{
1293
1294 struct ext4_sb_info *sbi = EXT4_SB(sb);
1295
1296 if (sb_any_quota_loaded(sb) &&
1297 sbi->s_qf_names[qtype]) {
1298 ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options"
1299 " when quota turned on");
57f73c2c 1300 return -1;
56c50f11 1301 }
03dafb5f 1302 kfree(sbi->s_qf_names[qtype]);
56c50f11
DM		 1303 sbi->s_qf_names[qtype] = NULL;
1304 return 1;
1305}
1306#endif
1307
26092bf5
TT		 1308#define MOPT_SET 0x0001
1309#define MOPT_CLEAR 0x0002
1310#define MOPT_NOSUPPORT 0x0004
1311#define MOPT_EXPLICIT 0x0008
1312#define MOPT_CLEAR_ERR 0x0010
1313#define MOPT_GTE0 0x0020
ac27a0ec 1314#ifdef CONFIG_QUOTA
26092bf5
TT		 1315#define MOPT_Q 0
1316#define MOPT_QFMT 0x0040
1317#else
1318#define MOPT_Q MOPT_NOSUPPORT
1319#define MOPT_QFMT MOPT_NOSUPPORT
ac27a0ec 1320#endif
26092bf5 1321#define MOPT_DATAJ 0x0080
8dc0aa8c
TT		 1322#define MOPT_NO_EXT2 0x0100
1323#define MOPT_NO_EXT3 0x0200
1324#define MOPT_EXT4_ONLY (MOPT_NO_EXT2 | MOPT_NO_EXT3)
26092bf5
TT		 1325
1326static const struct mount_opts {
1327 int token;
1328 int mount_opt;
1329 int flags;
1330} ext4_mount_opts[] = {
1331 {Opt_minix_df, EXT4_MOUNT_MINIX_DF, MOPT_SET},
1332 {Opt_bsd_df, EXT4_MOUNT_MINIX_DF, MOPT_CLEAR},
1333 {Opt_grpid, EXT4_MOUNT_GRPID, MOPT_SET},
1334 {Opt_nogrpid, EXT4_MOUNT_GRPID, MOPT_CLEAR},
26092bf5
TT		 1335 {Opt_block_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_SET},
1336 {Opt_noblock_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_CLEAR},
8dc0aa8c
TT		 1337 {Opt_dioread_nolock, EXT4_MOUNT_DIOREAD_NOLOCK,
1338 MOPT_EXT4_ONLY | MOPT_SET},
1339 {Opt_dioread_lock, EXT4_MOUNT_DIOREAD_NOLOCK,
1340 MOPT_EXT4_ONLY | MOPT_CLEAR},
26092bf5
TT		 1341 {Opt_discard, EXT4_MOUNT_DISCARD, MOPT_SET},
1342 {Opt_nodiscard, EXT4_MOUNT_DISCARD, MOPT_CLEAR},
8dc0aa8c
TT		 1343 {Opt_delalloc, EXT4_MOUNT_DELALLOC,
1344 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
1345 {Opt_nodelalloc, EXT4_MOUNT_DELALLOC,
1346 MOPT_EXT4_ONLY | MOPT_CLEAR | MOPT_EXPLICIT},
1347 {Opt_journal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
1348 MOPT_EXT4_ONLY | MOPT_SET},
26092bf5 1349 {Opt_journal_async_commit, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT |
8dc0aa8c
TT		 1350 EXT4_MOUNT_JOURNAL_CHECKSUM),
1351 MOPT_EXT4_ONLY | MOPT_SET},
1352 {Opt_noload, EXT4_MOUNT_NOLOAD, MOPT_NO_EXT2 | MOPT_SET},
26092bf5
TT		 1353 {Opt_err_panic, EXT4_MOUNT_ERRORS_PANIC, MOPT_SET | MOPT_CLEAR_ERR},
1354 {Opt_err_ro, EXT4_MOUNT_ERRORS_RO, MOPT_SET | MOPT_CLEAR_ERR},
1355 {Opt_err_cont, EXT4_MOUNT_ERRORS_CONT, MOPT_SET | MOPT_CLEAR_ERR},
8dc0aa8c
TT		 1356 {Opt_data_err_abort, EXT4_MOUNT_DATA_ERR_ABORT,
1357 MOPT_NO_EXT2 | MOPT_SET},
1358 {Opt_data_err_ignore, EXT4_MOUNT_DATA_ERR_ABORT,
1359 MOPT_NO_EXT2 | MOPT_CLEAR},
26092bf5
TT		 1360 {Opt_barrier, EXT4_MOUNT_BARRIER, MOPT_SET},
1361 {Opt_nobarrier, EXT4_MOUNT_BARRIER, MOPT_CLEAR},
1362 {Opt_noauto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_SET},
1363 {Opt_auto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_CLEAR},
1364 {Opt_noinit_itable, EXT4_MOUNT_INIT_INODE_TABLE, MOPT_CLEAR},
1365 {Opt_commit, 0, MOPT_GTE0},
1366 {Opt_max_batch_time, 0, MOPT_GTE0},
1367 {Opt_min_batch_time, 0, MOPT_GTE0},
1368 {Opt_inode_readahead_blks, 0, MOPT_GTE0},
1369 {Opt_init_itable, 0, MOPT_GTE0},
1370 {Opt_stripe, 0, MOPT_GTE0},
0efb3b23
JK		 1371 {Opt_resuid, 0, MOPT_GTE0},
1372 {Opt_resgid, 0, MOPT_GTE0},
1373 {Opt_journal_dev, 0, MOPT_GTE0},
1374 {Opt_journal_ioprio, 0, MOPT_GTE0},
8dc0aa8c
TT		 1375 {Opt_data_journal, EXT4_MOUNT_JOURNAL_DATA, MOPT_NO_EXT2 | MOPT_DATAJ},
1376 {Opt_data_ordered, EXT4_MOUNT_ORDERED_DATA, MOPT_NO_EXT2 | MOPT_DATAJ},
1377 {Opt_data_writeback, EXT4_MOUNT_WRITEBACK_DATA,
1378 MOPT_NO_EXT2 | MOPT_DATAJ},
26092bf5
TT		 1379 {Opt_user_xattr, EXT4_MOUNT_XATTR_USER, MOPT_SET},
1380 {Opt_nouser_xattr, EXT4_MOUNT_XATTR_USER, MOPT_CLEAR},
03010a33 1381#ifdef CONFIG_EXT4_FS_POSIX_ACL
26092bf5
TT		 1382 {Opt_acl, EXT4_MOUNT_POSIX_ACL, MOPT_SET},
1383 {Opt_noacl, EXT4_MOUNT_POSIX_ACL, MOPT_CLEAR},
ac27a0ec 1384#else
26092bf5
TT		 1385 {Opt_acl, 0, MOPT_NOSUPPORT},
1386 {Opt_noacl, 0, MOPT_NOSUPPORT},
ac27a0ec 1387#endif
26092bf5
TT		 1388 {Opt_nouid32, EXT4_MOUNT_NO_UID32, MOPT_SET},
1389 {Opt_debug, EXT4_MOUNT_DEBUG, MOPT_SET},
1390 {Opt_quota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA, MOPT_SET | MOPT_Q},
1391 {Opt_usrquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA,
1392 MOPT_SET | MOPT_Q},
1393 {Opt_grpquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_GRPQUOTA,
1394 MOPT_SET | MOPT_Q},
1395 {Opt_noquota, (EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA |
1396 EXT4_MOUNT_GRPQUOTA), MOPT_CLEAR | MOPT_Q},
1397 {Opt_usrjquota, 0, MOPT_Q},
1398 {Opt_grpjquota, 0, MOPT_Q},
1399 {Opt_offusrjquota, 0, MOPT_Q},
1400 {Opt_offgrpjquota, 0, MOPT_Q},
1401 {Opt_jqfmt_vfsold, QFMT_VFS_OLD, MOPT_QFMT},
1402 {Opt_jqfmt_vfsv0, QFMT_VFS_V0, MOPT_QFMT},
1403 {Opt_jqfmt_vfsv1, QFMT_VFS_V1, MOPT_QFMT},
df981d03 1404 {Opt_max_dir_size_kb, 0, MOPT_GTE0},
26092bf5
TT		 1405 {Opt_err, 0, 0}
1406};
1407
1408static int handle_mount_opt(struct super_block *sb, char *opt, int token,
1409 substring_t *args, unsigned long *journal_devnum,
1410 unsigned int *journal_ioprio, int is_remount)
1411{
1412 struct ext4_sb_info *sbi = EXT4_SB(sb);
1413 const struct mount_opts *m;
08cefc7a
EB		 1414 kuid_t uid;
1415 kgid_t gid;
26092bf5
TT		 1416 int arg = 0;
1417
57f73c2c
TT		 1418#ifdef CONFIG_QUOTA
1419 if (token == Opt_usrjquota)
1420 return set_qf_name(sb, USRQUOTA, &args[0]);
1421 else if (token == Opt_grpjquota)
1422 return set_qf_name(sb, GRPQUOTA, &args[0]);
1423 else if (token == Opt_offusrjquota)
1424 return clear_qf_name(sb, USRQUOTA);
1425 else if (token == Opt_offgrpjquota)
1426 return clear_qf_name(sb, GRPQUOTA);
1427#endif
26092bf5 1428 switch (token) {
f7048605
TT		 1429 case Opt_noacl:
1430 case Opt_nouser_xattr:
1431 ext4_msg(sb, KERN_WARNING, deprecated_msg, opt, "3.5");
1432 break;
26092bf5
TT		 1433 case Opt_sb:
1434 return 1; /* handled by get_sb_block() */
1435 case Opt_removed:
5f3633e3 1436 ext4_msg(sb, KERN_WARNING, "Ignoring removed %s option", opt);
26092bf5 1437 return 1;
26092bf5
TT		 1438 case Opt_abort:
1439 sbi->s_mount_flags |= EXT4_MF_FS_ABORTED;
1440 return 1;
1441 case Opt_i_version:
1442 sb->s_flags |= MS_I_VERSION;
1443 return 1;
26092bf5
TT		 1444 }
1445
5f3633e3
JK		 1446 for (m = ext4_mount_opts; m->token != Opt_err; m++)
1447 if (token == m->token)
1448 break;
1449
1450 if (m->token == Opt_err) {
1451 ext4_msg(sb, KERN_ERR, "Unrecognized mount option \"%s\" "
1452 "or missing value", opt);
1453 return -1;
1454 }
1455
8dc0aa8c
TT		 1456 if ((m->flags & MOPT_NO_EXT2) && IS_EXT2_SB(sb)) {
1457 ext4_msg(sb, KERN_ERR,
1458 "Mount option \"%s\" incompatible with ext2", opt);
1459 return -1;
1460 }
1461 if ((m->flags & MOPT_NO_EXT3) && IS_EXT3_SB(sb)) {
1462 ext4_msg(sb, KERN_ERR,
1463 "Mount option \"%s\" incompatible with ext3", opt);
1464 return -1;
1465 }
1466
5f3633e3
JK		 1467 if (args->from && match_int(args, &arg))
1468 return -1;
1469 if (args->from && (m->flags & MOPT_GTE0) && (arg < 0))
1470 return -1;
1471 if (m->flags & MOPT_EXPLICIT)
1472 set_opt2(sb, EXPLICIT_DELALLOC);
1473 if (m->flags & MOPT_CLEAR_ERR)
1474 clear_opt(sb, ERRORS_MASK);
1475 if (token == Opt_noquota && sb_any_quota_loaded(sb)) {
1476 ext4_msg(sb, KERN_ERR, "Cannot change quota "
1477 "options when quota turned on");
1478 return -1;
1479 }
1480
1481 if (m->flags & MOPT_NOSUPPORT) {
1482 ext4_msg(sb, KERN_ERR, "%s option not supported", opt);
1483 } else if (token == Opt_commit) {
1484 if (arg == 0)
1485 arg = JBD2_DEFAULT_MAX_COMMIT_AGE;
1486 sbi->s_commit_interval = HZ * arg;
1487 } else if (token == Opt_max_batch_time) {
1488 if (arg == 0)
1489 arg = EXT4_DEF_MAX_BATCH_TIME;
1490 sbi->s_max_batch_time = arg;
1491 } else if (token == Opt_min_batch_time) {
1492 sbi->s_min_batch_time = arg;
1493 } else if (token == Opt_inode_readahead_blks) {
e33e60ea
JK		 1494 if (arg && (arg > (1 << 30) || !is_power_of_2(arg))) {
1495 ext4_msg(sb, KERN_ERR,
1496 "EXT4-fs: inode_readahead_blks must be "
1497 "0 or a power of 2 smaller than 2^31");
26092bf5 1498 return -1;
5f3633e3
JK		 1499 }
1500 sbi->s_inode_readahead_blks = arg;
1501 } else if (token == Opt_init_itable) {
1502 set_opt(sb, INIT_INODE_TABLE);
1503 if (!args->from)
1504 arg = EXT4_DEF_LI_WAIT_MULT;
1505 sbi->s_li_wait_mult = arg;
1506 } else if (token == Opt_max_dir_size_kb) {
1507 sbi->s_max_dir_size_kb = arg;
1508 } else if (token == Opt_stripe) {
1509 sbi->s_stripe = arg;
1510 } else if (token == Opt_resuid) {
1511 uid = make_kuid(current_user_ns(), arg);
1512 if (!uid_valid(uid)) {
1513 ext4_msg(sb, KERN_ERR, "Invalid uid value %d", arg);
26092bf5
TT		 1514 return -1;
1515 }
5f3633e3
JK		 1516 sbi->s_resuid = uid;
1517 } else if (token == Opt_resgid) {
1518 gid = make_kgid(current_user_ns(), arg);
1519 if (!gid_valid(gid)) {
1520 ext4_msg(sb, KERN_ERR, "Invalid gid value %d", arg);
1521 return -1;
1522 }
1523 sbi->s_resgid = gid;
1524 } else if (token == Opt_journal_dev) {
1525 if (is_remount) {
1526 ext4_msg(sb, KERN_ERR,
1527 "Cannot specify journal on remount");
1528 return -1;
1529 }
1530 *journal_devnum = arg;
1531 } else if (token == Opt_journal_ioprio) {
1532 if (arg > 7) {
1533 ext4_msg(sb, KERN_ERR, "Invalid journal IO priority"
1534 " (must be 0-7)");
1535 return -1;
1536 }
1537 *journal_ioprio =
1538 IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, arg);
1539 } else if (m->flags & MOPT_DATAJ) {
1540 if (is_remount) {
1541 if (!sbi->s_journal)
1542 ext4_msg(sb, KERN_WARNING, "Remounting file system with no journal so ignoring journalled data option");
1543 else if (test_opt(sb, DATA_FLAGS) != m->mount_opt) {
0efb3b23 1544 ext4_msg(sb, KERN_ERR,
26092bf5 1545 "Cannot change data mode on remount");
26092bf5 1546 return -1;
ac27a0ec 1547 }
26092bf5 1548 } else {
5f3633e3
JK		 1549 clear_opt(sb, DATA_FLAGS);
1550 sbi->s_mount_opt |= m->mount_opt;
ac27a0ec 1551 }
5f3633e3
JK		 1552#ifdef CONFIG_QUOTA
1553 } else if (m->flags & MOPT_QFMT) {
1554 if (sb_any_quota_loaded(sb) &&
1555 sbi->s_jquota_fmt != m->mount_opt) {
1556 ext4_msg(sb, KERN_ERR, "Cannot change journaled "
1557 "quota options when quota turned on");
1558 return -1;
1559 }
262b4662
JK		 1560 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
1561 EXT4_FEATURE_RO_COMPAT_QUOTA)) {
1562 ext4_msg(sb, KERN_ERR,
1563 "Cannot set journaled quota options "
1564 "when QUOTA feature is enabled");
1565 return -1;
1566 }
5f3633e3
JK		 1567 sbi->s_jquota_fmt = m->mount_opt;
1568#endif
1569 } else {
1570 if (!args->from)
1571 arg = 1;
1572 if (m->flags & MOPT_CLEAR)
1573 arg = !arg;
1574 else if (unlikely(!(m->flags & MOPT_SET))) {
1575 ext4_msg(sb, KERN_WARNING,
1576 "buggy handling of option %s", opt);
1577 WARN_ON(1);
1578 return -1;
1579 }
1580 if (arg != 0)
1581 sbi->s_mount_opt |= m->mount_opt;
1582 else
1583 sbi->s_mount_opt &= ~m->mount_opt;
26092bf5 1584 }
5f3633e3 1585 return 1;
26092bf5
TT		 1586}
1587
1588static int parse_options(char *options, struct super_block *sb,
1589 unsigned long *journal_devnum,
1590 unsigned int *journal_ioprio,
1591 int is_remount)
1592{
1593 struct ext4_sb_info *sbi = EXT4_SB(sb);
1594 char *p;
1595 substring_t args[MAX_OPT_ARGS];
1596 int token;
1597
1598 if (!options)
1599 return 1;
1600
1601 while ((p = strsep(&options, ",")) != NULL) {
1602 if (!*p)
1603 continue;
1604 /*
1605 * Initialize args struct so we know whether arg was
1606 * found; some options take optional arguments.
1607 */
caecd0af 1608 args[0].to = args[0].from = NULL;
26092bf5
TT		 1609 token = match_token(p, tokens, args);
1610 if (handle_mount_opt(sb, p, token, args, journal_devnum,
1611 journal_ioprio, is_remount) < 0)
1612 return 0;
ac27a0ec
DK		 1613 }
1614#ifdef CONFIG_QUOTA
262b4662
JK		 1615 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) &&
1616 (test_opt(sb, USRQUOTA) || test_opt(sb, GRPQUOTA))) {
1617 ext4_msg(sb, KERN_ERR, "Cannot set quota options when QUOTA "
1618 "feature is enabled");
1619 return 0;
1620 }
ac27a0ec 1621 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
482a7425 1622 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
fd8c37ec 1623 clear_opt(sb, USRQUOTA);
ac27a0ec 1624
482a7425 1625 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
fd8c37ec 1626 clear_opt(sb, GRPQUOTA);
ac27a0ec 1627
56c50f11 1628 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
b31e1552
ES		 1629 ext4_msg(sb, KERN_ERR, "old and new quota "
1630 "format mixing");
ac27a0ec
DK		 1631 return 0;
1632 }
1633
1634 if (!sbi->s_jquota_fmt) {
b31e1552
ES		 1635 ext4_msg(sb, KERN_ERR, "journaled quota format "
1636 "not specified");
ac27a0ec
DK		 1637 return 0;
1638 }
1639 } else {
1640 if (sbi->s_jquota_fmt) {
b31e1552 1641 ext4_msg(sb, KERN_ERR, "journaled quota format "
2c8be6b2 1642 "specified with no journaling "
b31e1552 1643 "enabled");
ac27a0ec
DK		 1644 return 0;
1645 }
1646 }
1647#endif
261cb20c
JK		 1648 if (test_opt(sb, DIOREAD_NOLOCK)) {
1649 int blocksize =
1650 BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);
1651
1652 if (blocksize < PAGE_CACHE_SIZE) {
1653 ext4_msg(sb, KERN_ERR, "can't mount with "
1654 "dioread_nolock if block size != PAGE_SIZE");
1655 return 0;
1656 }
1657 }
ac27a0ec
DK		 1658 return 1;
1659}
1660
2adf6da8
TT		 1661static inline void ext4_show_quota_options(struct seq_file *seq,
1662 struct super_block *sb)
1663{
1664#if defined(CONFIG_QUOTA)
1665 struct ext4_sb_info *sbi = EXT4_SB(sb);
1666
1667 if (sbi->s_jquota_fmt) {
1668 char *fmtname = "";
1669
1670 switch (sbi->s_jquota_fmt) {
1671 case QFMT_VFS_OLD:
1672 fmtname = "vfsold";
1673 break;
1674 case QFMT_VFS_V0:
1675 fmtname = "vfsv0";
1676 break;
1677 case QFMT_VFS_V1:
1678 fmtname = "vfsv1";
1679 break;
1680 }
1681 seq_printf(seq, ",jqfmt=%s", fmtname);
1682 }
1683
1684 if (sbi->s_qf_names[USRQUOTA])
1685 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
1686
1687 if (sbi->s_qf_names[GRPQUOTA])
1688 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
1689
1690 if (test_opt(sb, USRQUOTA))
1691 seq_puts(seq, ",usrquota");
1692
1693 if (test_opt(sb, GRPQUOTA))
1694 seq_puts(seq, ",grpquota");
1695#endif
1696}
1697
5a916be1
TT		 1698static const char *token2str(int token)
1699{
50df9fd5 1700 const struct match_token *t;
5a916be1
TT		 1701
1702 for (t = tokens; t->token != Opt_err; t++)
1703 if (t->token == token && !strchr(t->pattern, '='))
1704 break;
1705 return t->pattern;
1706}
1707
2adf6da8
TT		 1708/*
1709 * Show an option if
1710 * - it's set to a non-default value OR
1711 * - if the per-sb default is different from the global default
1712 */
66acdcf4
TT		 1713static int _ext4_show_options(struct seq_file *seq, struct super_block *sb,
1714 int nodefs)
2adf6da8 1715{
2adf6da8
TT		 1716 struct ext4_sb_info *sbi = EXT4_SB(sb);
1717 struct ext4_super_block *es = sbi->s_es;
66acdcf4 1718 int def_errors, def_mount_opt = nodefs ? 0 : sbi->s_def_mount_opt;
5a916be1 1719 const struct mount_opts *m;
66acdcf4 1720 char sep = nodefs ? '\n' : ',';
2adf6da8 1721
66acdcf4
TT		 1722#define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep)
1723#define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg)
2adf6da8
TT		 1724
1725 if (sbi->s_sb_block != 1)
5a916be1
TT		 1726 SEQ_OPTS_PRINT("sb=%llu", sbi->s_sb_block);
1727
1728 for (m = ext4_mount_opts; m->token != Opt_err; m++) {
1729 int want_set = m->flags & MOPT_SET;
1730 if (((m->flags & (MOPT_SET|MOPT_CLEAR)) == 0) ||
1731 (m->flags & MOPT_CLEAR_ERR))
1732 continue;
66acdcf4 1733 if (!(m->mount_opt & (sbi->s_mount_opt ^ def_mount_opt)))
5a916be1
TT		 1734 continue; /* skip if same as the default */
1735 if ((want_set &&
1736 (sbi->s_mount_opt & m->mount_opt) != m->mount_opt) ||
1737 (!want_set && (sbi->s_mount_opt & m->mount_opt)))
1738 continue; /* select Opt_noFoo vs Opt_Foo */
1739 SEQ_OPTS_PRINT("%s", token2str(m->token));
2adf6da8 1740 }
5a916be1 1741
08cefc7a 1742 if (nodefs || !uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT4_DEF_RESUID)) ||
5a916be1 1743 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID)
08cefc7a
EB		 1744 SEQ_OPTS_PRINT("resuid=%u",
1745 from_kuid_munged(&init_user_ns, sbi->s_resuid));
1746 if (nodefs || !gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT4_DEF_RESGID)) ||
5a916be1 1747 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID)
08cefc7a
EB		 1748 SEQ_OPTS_PRINT("resgid=%u",
1749 from_kgid_munged(&init_user_ns, sbi->s_resgid));
66acdcf4 1750 def_errors = nodefs ? -1 : le16_to_cpu(es->s_errors);
5a916be1
TT		 1751 if (test_opt(sb, ERRORS_RO) && def_errors != EXT4_ERRORS_RO)
1752 SEQ_OPTS_PUTS("errors=remount-ro");
2adf6da8 1753 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
5a916be1 1754 SEQ_OPTS_PUTS("errors=continue");
2adf6da8 1755 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
5a916be1 1756 SEQ_OPTS_PUTS("errors=panic");
66acdcf4 1757 if (nodefs || sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ)
5a916be1 1758 SEQ_OPTS_PRINT("commit=%lu", sbi->s_commit_interval / HZ);
66acdcf4 1759 if (nodefs || sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME)
5a916be1 1760 SEQ_OPTS_PRINT("min_batch_time=%u", sbi->s_min_batch_time);
66acdcf4 1761 if (nodefs || sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME)
5a916be1 1762 SEQ_OPTS_PRINT("max_batch_time=%u", sbi->s_max_batch_time);
2adf6da8 1763 if (sb->s_flags & MS_I_VERSION)
5a916be1 1764 SEQ_OPTS_PUTS("i_version");
66acdcf4 1765 if (nodefs || sbi->s_stripe)
5a916be1 1766 SEQ_OPTS_PRINT("stripe=%lu", sbi->s_stripe);
66acdcf4 1767 if (EXT4_MOUNT_DATA_FLAGS & (sbi->s_mount_opt ^ def_mount_opt)) {
5a916be1
TT		 1768 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
1769 SEQ_OPTS_PUTS("data=journal");
1770 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
1771 SEQ_OPTS_PUTS("data=ordered");
1772 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
1773 SEQ_OPTS_PUTS("data=writeback");
1774 }
66acdcf4
TT		 1775 if (nodefs ||
1776 sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
5a916be1
TT		 1777 SEQ_OPTS_PRINT("inode_readahead_blks=%u",
1778 sbi->s_inode_readahead_blks);
2adf6da8 1779
66acdcf4
TT		 1780 if (nodefs || (test_opt(sb, INIT_INODE_TABLE) &&
1781 (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT)))
5a916be1 1782 SEQ_OPTS_PRINT("init_itable=%u", sbi->s_li_wait_mult);
df981d03
TT		 1783 if (nodefs || sbi->s_max_dir_size_kb)
1784 SEQ_OPTS_PRINT("max_dir_size_kb=%u", sbi->s_max_dir_size_kb);
2adf6da8
TT		 1785
1786 ext4_show_quota_options(seq, sb);
2adf6da8
TT		 1787 return 0;
1788}
1789
66acdcf4
TT		 1790static int ext4_show_options(struct seq_file *seq, struct dentry *root)
1791{
1792 return _ext4_show_options(seq, root->d_sb, 0);
1793}
1794
1795static int options_seq_show(struct seq_file *seq, void *offset)
1796{
1797 struct super_block *sb = seq->private;
1798 int rc;
1799
1800 seq_puts(seq, (sb->s_flags & MS_RDONLY) ? "ro" : "rw");
1801 rc = _ext4_show_options(seq, sb, 1);
1802 seq_puts(seq, "\n");
1803 return rc;
1804}
1805
1806static int options_open_fs(struct inode *inode, struct file *file)
1807{
1808 return single_open(file, options_seq_show, PDE(inode)->data);
1809}
1810
1811static const struct file_operations ext4_seq_options_fops = {
1812 .owner = THIS_MODULE,
1813 .open = options_open_fs,
1814 .read = seq_read,
1815 .llseek = seq_lseek,
1816 .release = single_release,
1817};
1818
617ba13b 1819static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
ac27a0ec
DK		 1820 int read_only)
1821{
617ba13b 1822 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec
DK		 1823 int res = 0;
1824
617ba13b 1825 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
b31e1552
ES		 1826 ext4_msg(sb, KERN_ERR, "revision level too high, "
1827 "forcing read-only mode");
ac27a0ec
DK		 1828 res = MS_RDONLY;
1829 }
1830 if (read_only)
281b5995 1831 goto done;
617ba13b 1832 if (!(sbi->s_mount_state & EXT4_VALID_FS))
b31e1552
ES		 1833 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
1834 "running e2fsck is recommended");
617ba13b 1835 else if ((sbi->s_mount_state & EXT4_ERROR_FS))
b31e1552
ES		 1836 ext4_msg(sb, KERN_WARNING,
1837 "warning: mounting fs with errors, "
1838 "running e2fsck is recommended");
ed3ce80a 1839 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
ac27a0ec
DK		 1840 le16_to_cpu(es->s_mnt_count) >=
1841 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
b31e1552
ES		 1842 ext4_msg(sb, KERN_WARNING,
1843 "warning: maximal mount count reached, "
1844 "running e2fsck is recommended");
ac27a0ec
DK		 1845 else if (le32_to_cpu(es->s_checkinterval) &&
1846 (le32_to_cpu(es->s_lastcheck) +
1847 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
b31e1552
ES		 1848 ext4_msg(sb, KERN_WARNING,
1849 "warning: checktime reached, "
1850 "running e2fsck is recommended");
0b8e58a1 1851 if (!sbi->s_journal)
0390131b 1852 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
ac27a0ec 1853 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
617ba13b 1854 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
e8546d06 1855 le16_add_cpu(&es->s_mnt_count, 1);
ac27a0ec 1856 es->s_mtime = cpu_to_le32(get_seconds());
617ba13b 1857 ext4_update_dynamic_rev(sb);
0390131b
FM		 1858 if (sbi->s_journal)
1859 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
ac27a0ec 1860
e2d67052 1861 ext4_commit_super(sb, 1);
281b5995 1862done:
ac27a0ec 1863 if (test_opt(sb, DEBUG))
a9df9a49 1864 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
a2595b8a 1865 "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
ac27a0ec
DK		 1866 sb->s_blocksize,
1867 sbi->s_groups_count,
617ba13b
MC		 1868 EXT4_BLOCKS_PER_GROUP(sb),
1869 EXT4_INODES_PER_GROUP(sb),
a2595b8a 1870 sbi->s_mount_opt, sbi->s_mount_opt2);
ac27a0ec 1871
7abc52c2 1872 cleancache_init_fs(sb);
ac27a0ec
DK		 1873 return res;
1874}
1875
117fff10
TT		 1876int ext4_alloc_flex_bg_array(struct super_block *sb, ext4_group_t ngroup)
1877{
1878 struct ext4_sb_info *sbi = EXT4_SB(sb);
1879 struct flex_groups *new_groups;
1880 int size;
1881
1882 if (!sbi->s_log_groups_per_flex)
1883 return 0;
1884
1885 size = ext4_flex_group(sbi, ngroup - 1) + 1;
1886 if (size <= sbi->s_flex_groups_allocated)
1887 return 0;
1888
1889 size = roundup_pow_of_two(size * sizeof(struct flex_groups));
1890 new_groups = ext4_kvzalloc(size, GFP_KERNEL);
1891 if (!new_groups) {
1892 ext4_msg(sb, KERN_ERR, "not enough memory for %d flex groups",
1893 size / (int) sizeof(struct flex_groups));
1894 return -ENOMEM;
1895 }
1896
1897 if (sbi->s_flex_groups) {
1898 memcpy(new_groups, sbi->s_flex_groups,
1899 (sbi->s_flex_groups_allocated *
1900 sizeof(struct flex_groups)));
1901 ext4_kvfree(sbi->s_flex_groups);
1902 }
1903 sbi->s_flex_groups = new_groups;
1904 sbi->s_flex_groups_allocated = size / sizeof(struct flex_groups);
1905 return 0;
1906}
1907
772cb7c8
JS		 1908static int ext4_fill_flex_info(struct super_block *sb)
1909{
1910 struct ext4_sb_info *sbi = EXT4_SB(sb);
1911 struct ext4_group_desc *gdp = NULL;
772cb7c8 1912 ext4_group_t flex_group;
d50f2ab6 1913 unsigned int groups_per_flex = 0;
117fff10 1914 int i, err;
772cb7c8 1915
503358ae 1916 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
d50f2ab6 1917 if (sbi->s_log_groups_per_flex < 1 || sbi->s_log_groups_per_flex > 31) {
772cb7c8
JS		 1918 sbi->s_log_groups_per_flex = 0;
1919 return 1;
1920 }
76495ec1 1921 groups_per_flex = 1U << sbi->s_log_groups_per_flex;
772cb7c8 1922
117fff10
TT		 1923 err = ext4_alloc_flex_bg_array(sb, sbi->s_groups_count);
1924 if (err)
9933fc0a 1925 goto failed;
772cb7c8 1926
772cb7c8 1927 for (i = 0; i < sbi->s_groups_count; i++) {
88b6edd1 1928 gdp = ext4_get_group_desc(sb, i, NULL);
772cb7c8
JS		 1929
1930 flex_group = ext4_flex_group(sbi, i);
7ad9bb65
TT		 1931 atomic_add(ext4_free_inodes_count(sb, gdp),
1932 &sbi->s_flex_groups[flex_group].free_inodes);
90ba983f
TT		 1933 atomic64_add(ext4_free_group_clusters(sb, gdp),
1934 &sbi->s_flex_groups[flex_group].free_clusters);
7ad9bb65
TT		 1935 atomic_add(ext4_used_dirs_count(sb, gdp),
1936 &sbi->s_flex_groups[flex_group].used_dirs);
772cb7c8
JS		 1937 }
1938
1939 return 1;
1940failed:
1941 return 0;
1942}
1943
feb0ab32
DW		 1944static __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
1945 struct ext4_group_desc *gdp)
717d50e4 1946{
feb0ab32 1947 int offset;
717d50e4 1948 __u16 crc = 0;
feb0ab32 1949 __le32 le_group = cpu_to_le32(block_group);
717d50e4 1950
feb0ab32
DW		 1951 if ((sbi->s_es->s_feature_ro_compat &
1952 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))) {
1953 /* Use new metadata_csum algorithm */
1954 __u16 old_csum;
1955 __u32 csum32;
1956
1957 old_csum = gdp->bg_checksum;
1958 gdp->bg_checksum = 0;
1959 csum32 = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&le_group,
1960 sizeof(le_group));
1961 csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp,
1962 sbi->s_desc_size);
1963 gdp->bg_checksum = old_csum;
1964
1965 crc = csum32 & 0xFFFF;
1966 goto out;
717d50e4
AD		 1967 }
1968
feb0ab32
DW		 1969 /* old crc16 code */
1970 offset = offsetof(struct ext4_group_desc, bg_checksum);
1971
1972 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
1973 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
1974 crc = crc16(crc, (__u8 *)gdp, offset);
1975 offset += sizeof(gdp->bg_checksum); /* skip checksum */
1976 /* for checksum of struct ext4_group_desc do the rest...*/
1977 if ((sbi->s_es->s_feature_incompat &
1978 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) &&
1979 offset < le16_to_cpu(sbi->s_es->s_desc_size))
1980 crc = crc16(crc, (__u8 *)gdp + offset,
1981 le16_to_cpu(sbi->s_es->s_desc_size) -
1982 offset);
1983
1984out:
717d50e4
AD		 1985 return cpu_to_le16(crc);
1986}
1987
feb0ab32 1988int ext4_group_desc_csum_verify(struct super_block *sb, __u32 block_group,
717d50e4
AD		 1989 struct ext4_group_desc *gdp)
1990{
feb0ab32
DW		 1991 if (ext4_has_group_desc_csum(sb) &&
1992 (gdp->bg_checksum != ext4_group_desc_csum(EXT4_SB(sb),
1993 block_group, gdp)))
717d50e4
AD		 1994 return 0;
1995
1996 return 1;
1997}
1998
feb0ab32
DW		 1999void ext4_group_desc_csum_set(struct super_block *sb, __u32 block_group,
2000 struct ext4_group_desc *gdp)
2001{
2002 if (!ext4_has_group_desc_csum(sb))
2003 return;
2004 gdp->bg_checksum = ext4_group_desc_csum(EXT4_SB(sb), block_group, gdp);
2005}
2006
ac27a0ec 2007/* Called at mount-time, super-block is locked */
bfff6873
LC		 2008static int ext4_check_descriptors(struct super_block *sb,
2009 ext4_group_t *first_not_zeroed)
ac27a0ec 2010{
617ba13b
MC		 2011 struct ext4_sb_info *sbi = EXT4_SB(sb);
2012 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
2013 ext4_fsblk_t last_block;
bd81d8ee
LV		 2014 ext4_fsblk_t block_bitmap;
2015 ext4_fsblk_t inode_bitmap;
2016 ext4_fsblk_t inode_table;
ce421581 2017 int flexbg_flag = 0;
bfff6873 2018 ext4_group_t i, grp = sbi->s_groups_count;
ac27a0ec 2019
ce421581
JS		 2020 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
2021 flexbg_flag = 1;
2022
af5bc92d 2023 ext4_debug("Checking group descriptors");
ac27a0ec 2024
197cd65a
AM		 2025 for (i = 0; i < sbi->s_groups_count; i++) {
2026 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
2027
ce421581 2028 if (i == sbi->s_groups_count - 1 || flexbg_flag)
bd81d8ee 2029 last_block = ext4_blocks_count(sbi->s_es) - 1;
ac27a0ec
DK		 2030 else
2031 last_block = first_block +
617ba13b 2032 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
ac27a0ec 2033
bfff6873
LC		 2034 if ((grp == sbi->s_groups_count) &&
2035 !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2036 grp = i;
2037
8fadc143 2038 block_bitmap = ext4_block_bitmap(sb, gdp);
2b2d6d01 2039 if (block_bitmap < first_block || block_bitmap > last_block) {
b31e1552 2040 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2041 "Block bitmap for group %u not in group "
b31e1552 2042 "(block %llu)!", i, block_bitmap);
ac27a0ec
DK		 2043 return 0;
2044 }
8fadc143 2045 inode_bitmap = ext4_inode_bitmap(sb, gdp);
2b2d6d01 2046 if (inode_bitmap < first_block || inode_bitmap > last_block) {
b31e1552 2047 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2048 "Inode bitmap for group %u not in group "
b31e1552 2049 "(block %llu)!", i, inode_bitmap);
ac27a0ec
DK		 2050 return 0;
2051 }
8fadc143 2052 inode_table = ext4_inode_table(sb, gdp);
bd81d8ee 2053 if (inode_table < first_block ||
2b2d6d01 2054 inode_table + sbi->s_itb_per_group - 1 > last_block) {
b31e1552 2055 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2056 "Inode table for group %u not in group "
b31e1552 2057 "(block %llu)!", i, inode_table);
ac27a0ec
DK		 2058 return 0;
2059 }
955ce5f5 2060 ext4_lock_group(sb, i);
feb0ab32 2061 if (!ext4_group_desc_csum_verify(sb, i, gdp)) {
b31e1552
ES		 2062 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2063 "Checksum for group %u failed (%u!=%u)",
2064 i, le16_to_cpu(ext4_group_desc_csum(sbi, i,
2065 gdp)), le16_to_cpu(gdp->bg_checksum));
7ee1ec4c 2066 if (!(sb->s_flags & MS_RDONLY)) {
955ce5f5 2067 ext4_unlock_group(sb, i);
8a266467 2068 return 0;
7ee1ec4c 2069 }
717d50e4 2070 }
955ce5f5 2071 ext4_unlock_group(sb, i);
ce421581
JS		 2072 if (!flexbg_flag)
2073 first_block += EXT4_BLOCKS_PER_GROUP(sb);
ac27a0ec 2074 }
bfff6873
LC		 2075 if (NULL != first_not_zeroed)
2076 *first_not_zeroed = grp;
ac27a0ec 2077
5dee5437
TT		 2078 ext4_free_blocks_count_set(sbi->s_es,
2079 EXT4_C2B(sbi, ext4_count_free_clusters(sb)));
0b8e58a1 2080 sbi->s_es->s_free_inodes_count =cpu_to_le32(ext4_count_free_inodes(sb));
ac27a0ec
DK		 2081 return 1;
2082}
2083
617ba13b 2084/* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
ac27a0ec
DK		 2085 * the superblock) which were deleted from all directories, but held open by
2086 * a process at the time of a crash. We walk the list and try to delete these
2087 * inodes at recovery time (only with a read-write filesystem).
2088 *
2089 * In order to keep the orphan inode chain consistent during traversal (in
2090 * case of crash during recovery), we link each inode into the superblock
2091 * orphan list_head and handle it the same way as an inode deletion during
2092 * normal operation (which journals the operations for us).
2093 *
2094 * We only do an iget() and an iput() on each inode, which is very safe if we
2095 * accidentally point at an in-use or already deleted inode. The worst that
2096 * can happen in this case is that we get a "bit already cleared" message from
617ba13b 2097 * ext4_free_inode(). The only reason we would point at a wrong inode is if
ac27a0ec
DK		 2098 * e2fsck was run on this filesystem, and it must have already done the orphan
2099 * inode cleanup for us, so we can safely abort without any further action.
2100 */
2b2d6d01
TT		 2101static void ext4_orphan_cleanup(struct super_block *sb,
2102 struct ext4_super_block *es)
ac27a0ec
DK		 2103{
2104 unsigned int s_flags = sb->s_flags;
2105 int nr_orphans = 0, nr_truncates = 0;
2106#ifdef CONFIG_QUOTA
2107 int i;
2108#endif
2109 if (!es->s_last_orphan) {
2110 jbd_debug(4, "no orphan inodes to clean up\n");
2111 return;
2112 }
2113
a8f48a95 2114 if (bdev_read_only(sb->s_bdev)) {
b31e1552
ES		 2115 ext4_msg(sb, KERN_ERR, "write access "
2116 "unavailable, skipping orphan cleanup");
a8f48a95
ES		 2117 return;
2118 }
2119
d39195c3
AG		 2120 /* Check if feature set would not allow a r/w mount */
2121 if (!ext4_feature_set_ok(sb, 0)) {
2122 ext4_msg(sb, KERN_INFO, "Skipping orphan cleanup due to "
2123 "unknown ROCOMPAT features");
2124 return;
2125 }
2126
617ba13b 2127 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
c25f9bc6
ES		 2128 /* don't clear list on RO mount w/ errors */
2129 if (es->s_last_orphan && !(s_flags & MS_RDONLY)) {
ac27a0ec
DK		 2130 jbd_debug(1, "Errors on filesystem, "
2131 "clearing orphan list.\n");
c25f9bc6
ES		 2132 es->s_last_orphan = 0;
2133 }
ac27a0ec
DK		 2134 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2135 return;
2136 }
2137
2138 if (s_flags & MS_RDONLY) {
b31e1552 2139 ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
ac27a0ec
DK		 2140 sb->s_flags &= ~MS_RDONLY;
2141 }
2142#ifdef CONFIG_QUOTA
2143 /* Needed for iput() to work correctly and not trash data */
2144 sb->s_flags |= MS_ACTIVE;
2145 /* Turn on quotas so that they are updated correctly */
2146 for (i = 0; i < MAXQUOTAS; i++) {
617ba13b
MC		 2147 if (EXT4_SB(sb)->s_qf_names[i]) {
2148 int ret = ext4_quota_on_mount(sb, i);
ac27a0ec 2149 if (ret < 0)
b31e1552
ES		 2150 ext4_msg(sb, KERN_ERR,
2151 "Cannot turn on journaled "
2152 "quota: error %d", ret);
ac27a0ec
DK		 2153 }
2154 }
2155#endif
2156
2157 while (es->s_last_orphan) {
2158 struct inode *inode;
2159
97bd42b9
JB		 2160 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
2161 if (IS_ERR(inode)) {
ac27a0ec
DK		 2162 es->s_last_orphan = 0;
2163 break;
2164 }
2165
617ba13b 2166 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
871a2931 2167 dquot_initialize(inode);
ac27a0ec 2168 if (inode->i_nlink) {
b31e1552
ES		 2169 ext4_msg(sb, KERN_DEBUG,
2170 "%s: truncating inode %lu to %lld bytes",
46e665e9 2171 __func__, inode->i_ino, inode->i_size);
e5f8eab8 2172 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
ac27a0ec 2173 inode->i_ino, inode->i_size);
721e3eba 2174 mutex_lock(&inode->i_mutex);
617ba13b 2175 ext4_truncate(inode);
721e3eba 2176 mutex_unlock(&inode->i_mutex);
ac27a0ec
DK		 2177 nr_truncates++;
2178 } else {
b31e1552
ES		 2179 ext4_msg(sb, KERN_DEBUG,
2180 "%s: deleting unreferenced inode %lu",
46e665e9 2181 __func__, inode->i_ino);
ac27a0ec
DK		 2182 jbd_debug(2, "deleting unreferenced inode %lu\n",
2183 inode->i_ino);
2184 nr_orphans++;
2185 }
2186 iput(inode); /* The delete magic happens here! */
2187 }
2188
2b2d6d01 2189#define PLURAL(x) (x), ((x) == 1) ? "" : "s"
ac27a0ec
DK		 2190
2191 if (nr_orphans)
b31e1552
ES		 2192 ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
2193 PLURAL(nr_orphans));
ac27a0ec 2194 if (nr_truncates)
b31e1552
ES		 2195 ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
2196 PLURAL(nr_truncates));
ac27a0ec
DK		 2197#ifdef CONFIG_QUOTA
2198 /* Turn quotas off */
2199 for (i = 0; i < MAXQUOTAS; i++) {
2200 if (sb_dqopt(sb)->files[i])
287a8095 2201 dquot_quota_off(sb, i);
ac27a0ec
DK		 2202 }
2203#endif
2204 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
2205}
0b8e58a1 2206
cd2291a4
ES		 2207/*
2208 * Maximal extent format file size.
2209 * Resulting logical blkno at s_maxbytes must fit in our on-disk
2210 * extent format containers, within a sector_t, and within i_blocks
2211 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
2212 * so that won't be a limiting factor.
2213 *
f17722f9
LC		 2214 * However there is other limiting factor. We do store extents in the form
2215 * of starting block and length, hence the resulting length of the extent
2216 * covering maximum file size must fit into on-disk format containers as
2217 * well. Given that length is always by 1 unit bigger than max unit (because
2218 * we count 0 as well) we have to lower the s_maxbytes by one fs block.
2219 *
cd2291a4
ES		 2220 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
2221 */
f287a1a5 2222static loff_t ext4_max_size(int blkbits, int has_huge_files)
cd2291a4
ES		 2223{
2224 loff_t res;
2225 loff_t upper_limit = MAX_LFS_FILESIZE;
2226
2227 /* small i_blocks in vfs inode? */
f287a1a5 2228 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
cd2291a4 2229 /*
90c699a9 2230 * CONFIG_LBDAF is not enabled implies the inode
cd2291a4
ES		 2231 * i_block represent total blocks in 512 bytes
2232 * 32 == size of vfs inode i_blocks * 8
2233 */
2234 upper_limit = (1LL << 32) - 1;
2235
2236 /* total blocks in file system block size */
2237 upper_limit >>= (blkbits - 9);
2238 upper_limit <<= blkbits;
2239 }
2240
f17722f9
LC		 2241 /*
2242 * 32-bit extent-start container, ee_block. We lower the maxbytes
2243 * by one fs block, so ee_len can cover the extent of maximum file
2244 * size
2245 */
2246 res = (1LL << 32) - 1;
cd2291a4 2247 res <<= blkbits;
cd2291a4
ES		 2248
2249 /* Sanity check against vm- & vfs- imposed limits */
2250 if (res > upper_limit)
2251 res = upper_limit;
2252
2253 return res;
2254}
ac27a0ec 2255
ac27a0ec 2256/*
cd2291a4 2257 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
0fc1b451
AK		 2258 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2259 * We need to be 1 filesystem block less than the 2^48 sector limit.
ac27a0ec 2260 */
f287a1a5 2261static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
ac27a0ec 2262{
617ba13b 2263 loff_t res = EXT4_NDIR_BLOCKS;
0fc1b451
AK		 2264 int meta_blocks;
2265 loff_t upper_limit;
0b8e58a1
AD		 2266 /* This is calculated to be the largest file size for a dense, block
2267 * mapped file such that the file's total number of 512-byte sectors,
2268 * including data and all indirect blocks, does not exceed (2^48 - 1).
2269 *
2270 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2271 * number of 512-byte sectors of the file.
0fc1b451
AK		 2272 */
2273
f287a1a5 2274 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
0fc1b451 2275 /*
90c699a9 2276 * !has_huge_files or CONFIG_LBDAF not enabled implies that
0b8e58a1
AD		 2277 * the inode i_block field represents total file blocks in
2278 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
0fc1b451
AK		 2279 */
2280 upper_limit = (1LL << 32) - 1;
2281
2282 /* total blocks in file system block size */
2283 upper_limit >>= (bits - 9);
2284
2285 } else {
8180a562
AK		 2286 /*
2287 * We use 48 bit ext4_inode i_blocks
2288 * With EXT4_HUGE_FILE_FL set the i_blocks
2289 * represent total number of blocks in
2290 * file system block size
2291 */
0fc1b451
AK		 2292 upper_limit = (1LL << 48) - 1;
2293
0fc1b451
AK		 2294 }
2295
2296 /* indirect blocks */
2297 meta_blocks = 1;
2298 /* double indirect blocks */
2299 meta_blocks += 1 + (1LL << (bits-2));
2300 /* tripple indirect blocks */
2301 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
2302
2303 upper_limit -= meta_blocks;
2304 upper_limit <<= bits;
ac27a0ec
DK		 2305
2306 res += 1LL << (bits-2);
2307 res += 1LL << (2*(bits-2));
2308 res += 1LL << (3*(bits-2));
2309 res <<= bits;
2310 if (res > upper_limit)
2311 res = upper_limit;
0fc1b451
AK		 2312
2313 if (res > MAX_LFS_FILESIZE)
2314 res = MAX_LFS_FILESIZE;
2315
ac27a0ec
DK		 2316 return res;
2317}
2318
617ba13b 2319static ext4_fsblk_t descriptor_loc(struct super_block *sb,
0b8e58a1 2320 ext4_fsblk_t logical_sb_block, int nr)
ac27a0ec 2321{
617ba13b 2322 struct ext4_sb_info *sbi = EXT4_SB(sb);
fd2d4291 2323 ext4_group_t bg, first_meta_bg;
ac27a0ec
DK		 2324 int has_super = 0;
2325
2326 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
2327
617ba13b 2328 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
ac27a0ec 2329 nr < first_meta_bg)
70bbb3e0 2330 return logical_sb_block + nr + 1;
ac27a0ec 2331 bg = sbi->s_desc_per_block * nr;
617ba13b 2332 if (ext4_bg_has_super(sb, bg))
ac27a0ec 2333 has_super = 1;
0b8e58a1 2334
617ba13b 2335 return (has_super + ext4_group_first_block_no(sb, bg));
ac27a0ec
DK		 2336}
2337
c9de560d
AT		 2338/**
2339 * ext4_get_stripe_size: Get the stripe size.
2340 * @sbi: In memory super block info
2341 *
2342 * If we have specified it via mount option, then
2343 * use the mount option value. If the value specified at mount time is
2344 * greater than the blocks per group use the super block value.
2345 * If the super block value is greater than blocks per group return 0.
2346 * Allocator needs it be less than blocks per group.
2347 *
2348 */
2349static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
2350{
2351 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
2352 unsigned long stripe_width =
2353 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
3eb08658 2354 int ret;
c9de560d
AT		 2355
2356 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
3eb08658
DE		 2357 ret = sbi->s_stripe;
2358 else if (stripe_width <= sbi->s_blocks_per_group)
2359 ret = stripe_width;
2360 else if (stride <= sbi->s_blocks_per_group)
2361 ret = stride;
2362 else
2363 ret = 0;
c9de560d 2364
3eb08658
DE		 2365 /*
2366 * If the stripe width is 1, this makes no sense and
2367 * we set it to 0 to turn off stripe handling code.
2368 */
2369 if (ret <= 1)
2370 ret = 0;
c9de560d 2371
3eb08658 2372 return ret;
c9de560d 2373}
ac27a0ec 2374
3197ebdb
TT		 2375/* sysfs supprt */
2376
2377struct ext4_attr {
2378 struct attribute attr;
2379 ssize_t (*show)(struct ext4_attr *, struct ext4_sb_info *, char *);
60e6679e 2380 ssize_t (*store)(struct ext4_attr *, struct ext4_sb_info *,
3197ebdb
TT		 2381 const char *, size_t);
2382 int offset;
2383};
2384
2385static int parse_strtoul(const char *buf,
2386 unsigned long max, unsigned long *value)
2387{
2388 char *endp;
2389
e7d2860b
AGR		 2390 *value = simple_strtoul(skip_spaces(buf), &endp, 0);
2391 endp = skip_spaces(endp);
3197ebdb
TT		 2392 if (*endp || *value > max)
2393 return -EINVAL;
2394
2395 return 0;
2396}
2397
2398static ssize_t delayed_allocation_blocks_show(struct ext4_attr *a,
2399 struct ext4_sb_info *sbi,
2400 char *buf)
2401{
2402 return snprintf(buf, PAGE_SIZE, "%llu\n",
7b415bf6
AK		 2403 (s64) EXT4_C2B(sbi,
2404 percpu_counter_sum(&sbi->s_dirtyclusters_counter)));
3197ebdb
TT		 2405}
2406
2407static ssize_t session_write_kbytes_show(struct ext4_attr *a,
2408 struct ext4_sb_info *sbi, char *buf)
2409{
2410 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2411
f613dfcb
TT		 2412 if (!sb->s_bdev->bd_part)
2413 return snprintf(buf, PAGE_SIZE, "0\n");
3197ebdb
TT		 2414 return snprintf(buf, PAGE_SIZE, "%lu\n",
2415 (part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
2416 sbi->s_sectors_written_start) >> 1);
2417}
2418
2419static ssize_t lifetime_write_kbytes_show(struct ext4_attr *a,
2420 struct ext4_sb_info *sbi, char *buf)
2421{
2422 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2423
f613dfcb
TT		 2424 if (!sb->s_bdev->bd_part)
2425 return snprintf(buf, PAGE_SIZE, "0\n");
3197ebdb 2426 return snprintf(buf, PAGE_SIZE, "%llu\n",
a6b43e38 2427 (unsigned long long)(sbi->s_kbytes_written +
3197ebdb 2428 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
a6b43e38 2429 EXT4_SB(sb)->s_sectors_written_start) >> 1)));
3197ebdb
TT		 2430}
2431
2432static ssize_t inode_readahead_blks_store(struct ext4_attr *a,
2433 struct ext4_sb_info *sbi,
2434 const char *buf, size_t count)
2435{
2436 unsigned long t;
2437
2438 if (parse_strtoul(buf, 0x40000000, &t))
2439 return -EINVAL;
2440
5dbd571d 2441 if (t && !is_power_of_2(t))
3197ebdb
TT		 2442 return -EINVAL;
2443
2444 sbi->s_inode_readahead_blks = t;
2445 return count;
2446}
2447
2448static ssize_t sbi_ui_show(struct ext4_attr *a,
0b8e58a1 2449 struct ext4_sb_info *sbi, char *buf)
3197ebdb
TT		 2450{
2451 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
2452
2453 return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
2454}
2455
2456static ssize_t sbi_ui_store(struct ext4_attr *a,
2457 struct ext4_sb_info *sbi,
2458 const char *buf, size_t count)
2459{
2460 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->offset);
2461 unsigned long t;
2462
2463 if (parse_strtoul(buf, 0xffffffff, &t))
2464 return -EINVAL;
2465 *ui = t;
2466 return count;
2467}
2468
2c0544b2
TT		 2469static ssize_t trigger_test_error(struct ext4_attr *a,
2470 struct ext4_sb_info *sbi,
2471 const char *buf, size_t count)
2472{
2473 int len = count;
2474
2475 if (!capable(CAP_SYS_ADMIN))
2476 return -EPERM;
2477
2478 if (len && buf[len-1] == '\n')
2479 len--;
2480
2481 if (len)
2482 ext4_error(sbi->s_sb, "%.*s", len, buf);
2483 return count;
2484}
2485
3197ebdb
TT		 2486#define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \
2487static struct ext4_attr ext4_attr_##_name = { \
2488 .attr = {.name = __stringify(_name), .mode = _mode }, \
2489 .show = _show, \
2490 .store = _store, \
2491 .offset = offsetof(struct ext4_sb_info, _elname), \
2492}
2493#define EXT4_ATTR(name, mode, show, store) \
2494static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store)
2495
857ac889 2496#define EXT4_INFO_ATTR(name) EXT4_ATTR(name, 0444, NULL, NULL)
3197ebdb
TT		 2497#define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL)
2498#define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store)
2499#define EXT4_RW_ATTR_SBI_UI(name, elname) \
2500 EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname)
2501#define ATTR_LIST(name) &ext4_attr_##name.attr
2502
2503EXT4_RO_ATTR(delayed_allocation_blocks);
2504EXT4_RO_ATTR(session_write_kbytes);
2505EXT4_RO_ATTR(lifetime_write_kbytes);
2506EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, sbi_ui_show,
2507 inode_readahead_blks_store, s_inode_readahead_blks);
11013911 2508EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal);
3197ebdb
TT		 2509EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats);
2510EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan);
2511EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan);
2512EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs);
2513EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request);
2514EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc);
55138e0b 2515EXT4_RW_ATTR_SBI_UI(max_writeback_mb_bump, s_max_writeback_mb_bump);
67a5da56 2516EXT4_RW_ATTR_SBI_UI(extent_max_zeroout_kb, s_extent_max_zeroout_kb);
2c0544b2 2517EXT4_ATTR(trigger_fs_error, 0200, NULL, trigger_test_error);
3197ebdb
TT		 2518
2519static struct attribute *ext4_attrs[] = {
2520 ATTR_LIST(delayed_allocation_blocks),
2521 ATTR_LIST(session_write_kbytes),
2522 ATTR_LIST(lifetime_write_kbytes),
2523 ATTR_LIST(inode_readahead_blks),
11013911 2524 ATTR_LIST(inode_goal),
3197ebdb
TT		 2525 ATTR_LIST(mb_stats),
2526 ATTR_LIST(mb_max_to_scan),
2527 ATTR_LIST(mb_min_to_scan),
2528 ATTR_LIST(mb_order2_req),
2529 ATTR_LIST(mb_stream_req),
2530 ATTR_LIST(mb_group_prealloc),
55138e0b 2531 ATTR_LIST(max_writeback_mb_bump),
67a5da56 2532 ATTR_LIST(extent_max_zeroout_kb),
2c0544b2 2533 ATTR_LIST(trigger_fs_error),
3197ebdb
TT		 2534 NULL,
2535};
2536
857ac889
LC		 2537/* Features this copy of ext4 supports */
2538EXT4_INFO_ATTR(lazy_itable_init);
27ee40df 2539EXT4_INFO_ATTR(batched_discard);
5e7bbef1 2540EXT4_INFO_ATTR(meta_bg_resize);
857ac889
LC		 2541
2542static struct attribute *ext4_feat_attrs[] = {
2543 ATTR_LIST(lazy_itable_init),
27ee40df 2544 ATTR_LIST(batched_discard),
5e7bbef1 2545 ATTR_LIST(meta_bg_resize),
857ac889
LC		 2546 NULL,
2547};
2548
3197ebdb
TT		 2549static ssize_t ext4_attr_show(struct kobject *kobj,
2550 struct attribute *attr, char *buf)
2551{
2552 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2553 s_kobj);
2554 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2555
2556 return a->show ? a->show(a, sbi, buf) : 0;
2557}
2558
2559static ssize_t ext4_attr_store(struct kobject *kobj,
2560 struct attribute *attr,
2561 const char *buf, size_t len)
2562{
2563 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2564 s_kobj);
2565 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2566
2567 return a->store ? a->store(a, sbi, buf, len) : 0;
2568}
2569
2570static void ext4_sb_release(struct kobject *kobj)
2571{
2572 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2573 s_kobj);
2574 complete(&sbi->s_kobj_unregister);
2575}
2576
52cf25d0 2577static const struct sysfs_ops ext4_attr_ops = {
3197ebdb
TT		 2578 .show = ext4_attr_show,
2579 .store = ext4_attr_store,
2580};
2581
2582static struct kobj_type ext4_ktype = {
2583 .default_attrs = ext4_attrs,
2584 .sysfs_ops = &ext4_attr_ops,
2585 .release = ext4_sb_release,
2586};
2587
857ac889
LC		 2588static void ext4_feat_release(struct kobject *kobj)
2589{
2590 complete(&ext4_feat->f_kobj_unregister);
2591}
2592
2593static struct kobj_type ext4_feat_ktype = {
2594 .default_attrs = ext4_feat_attrs,
2595 .sysfs_ops = &ext4_attr_ops,
2596 .release = ext4_feat_release,
2597};
2598
a13fb1a4
ES		 2599/*
2600 * Check whether this filesystem can be mounted based on
2601 * the features present and the RDONLY/RDWR mount requested.
2602 * Returns 1 if this filesystem can be mounted as requested,
2603 * 0 if it cannot be.
2604 */
2605static int ext4_feature_set_ok(struct super_block *sb, int readonly)
2606{
2607 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP)) {
2608 ext4_msg(sb, KERN_ERR,
2609 "Couldn't mount because of "
2610 "unsupported optional features (%x)",
2611 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
2612 ~EXT4_FEATURE_INCOMPAT_SUPP));
2613 return 0;
2614 }
2615
2616 if (readonly)
2617 return 1;
2618
2619 /* Check that feature set is OK for a read-write mount */
2620 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP)) {
2621 ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of "
2622 "unsupported optional features (%x)",
2623 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
2624 ~EXT4_FEATURE_RO_COMPAT_SUPP));
2625 return 0;
2626 }
2627 /*
2628 * Large file size enabled file system can only be mounted
2629 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
2630 */
2631 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) {
2632 if (sizeof(blkcnt_t) < sizeof(u64)) {
2633 ext4_msg(sb, KERN_ERR, "Filesystem with huge files "
2634 "cannot be mounted RDWR without "
2635 "CONFIG_LBDAF");
2636 return 0;
2637 }
2638 }
bab08ab9
TT		 2639 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_BIGALLOC) &&
2640 !EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS)) {
2641 ext4_msg(sb, KERN_ERR,
2642 "Can't support bigalloc feature without "
2643 "extents feature\n");
2644 return 0;
2645 }
7c319d32
AK		 2646
2647#ifndef CONFIG_QUOTA
2648 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) &&
2649 !readonly) {
2650 ext4_msg(sb, KERN_ERR,
2651 "Filesystem with quota feature cannot be mounted RDWR "
2652 "without CONFIG_QUOTA");
2653 return 0;
2654 }
2655#endif /* CONFIG_QUOTA */
a13fb1a4
ES		 2656 return 1;
2657}
2658
66e61a9e
TT		 2659/*
2660 * This function is called once a day if we have errors logged
2661 * on the file system
2662 */
2663static void print_daily_error_info(unsigned long arg)
2664{
2665 struct super_block *sb = (struct super_block *) arg;
2666 struct ext4_sb_info *sbi;
2667 struct ext4_super_block *es;
2668
2669 sbi = EXT4_SB(sb);
2670 es = sbi->s_es;
2671
2672 if (es->s_error_count)
2673 ext4_msg(sb, KERN_NOTICE, "error count: %u",
2674 le32_to_cpu(es->s_error_count));
2675 if (es->s_first_error_time) {
2676 printk(KERN_NOTICE "EXT4-fs (%s): initial error at %u: %.*s:%d",
2677 sb->s_id, le32_to_cpu(es->s_first_error_time),
2678 (int) sizeof(es->s_first_error_func),
2679 es->s_first_error_func,
2680 le32_to_cpu(es->s_first_error_line));
2681 if (es->s_first_error_ino)
2682 printk(": inode %u",
2683 le32_to_cpu(es->s_first_error_ino));
2684 if (es->s_first_error_block)
2685 printk(": block %llu", (unsigned long long)
2686 le64_to_cpu(es->s_first_error_block));
2687 printk("\n");
2688 }
2689 if (es->s_last_error_time) {
2690 printk(KERN_NOTICE "EXT4-fs (%s): last error at %u: %.*s:%d",
2691 sb->s_id, le32_to_cpu(es->s_last_error_time),
2692 (int) sizeof(es->s_last_error_func),
2693 es->s_last_error_func,
2694 le32_to_cpu(es->s_last_error_line));
2695 if (es->s_last_error_ino)
2696 printk(": inode %u",
2697 le32_to_cpu(es->s_last_error_ino));
2698 if (es->s_last_error_block)
2699 printk(": block %llu", (unsigned long long)
2700 le64_to_cpu(es->s_last_error_block));
2701 printk("\n");
2702 }
2703 mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ); /* Once a day */
2704}
2705
bfff6873
LC		 2706/* Find next suitable group and run ext4_init_inode_table */
2707static int ext4_run_li_request(struct ext4_li_request *elr)
2708{
2709 struct ext4_group_desc *gdp = NULL;
2710 ext4_group_t group, ngroups;
2711 struct super_block *sb;
2712 unsigned long timeout = 0;
2713 int ret = 0;
2714
2715 sb = elr->lr_super;
2716 ngroups = EXT4_SB(sb)->s_groups_count;
2717
8e8ad8a5 2718 sb_start_write(sb);
bfff6873
LC		 2719 for (group = elr->lr_next_group; group < ngroups; group++) {
2720 gdp = ext4_get_group_desc(sb, group, NULL);
2721 if (!gdp) {
2722 ret = 1;
2723 break;
2724 }
2725
2726 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2727 break;
2728 }
2729
7f511862 2730 if (group >= ngroups)
bfff6873
LC		 2731 ret = 1;
2732
2733 if (!ret) {
2734 timeout = jiffies;
2735 ret = ext4_init_inode_table(sb, group,
2736 elr->lr_timeout ? 0 : 1);
2737 if (elr->lr_timeout == 0) {
51ce6511
LC		 2738 timeout = (jiffies - timeout) *
2739 elr->lr_sbi->s_li_wait_mult;
bfff6873
LC		 2740 elr->lr_timeout = timeout;
2741 }
2742 elr->lr_next_sched = jiffies + elr->lr_timeout;
2743 elr->lr_next_group = group + 1;
2744 }
8e8ad8a5 2745 sb_end_write(sb);
bfff6873
LC		 2746
2747 return ret;
2748}
2749
2750/*
2751 * Remove lr_request from the list_request and free the
4ed5c033 2752 * request structure. Should be called with li_list_mtx held
bfff6873
LC		 2753 */
2754static void ext4_remove_li_request(struct ext4_li_request *elr)
2755{
2756 struct ext4_sb_info *sbi;
2757
2758 if (!elr)
2759 return;
2760
2761 sbi = elr->lr_sbi;
2762
2763 list_del(&elr->lr_request);
2764 sbi->s_li_request = NULL;
2765 kfree(elr);
2766}
2767
2768static void ext4_unregister_li_request(struct super_block *sb)
2769{
1bb933fb
LC		 2770 mutex_lock(&ext4_li_mtx);
2771 if (!ext4_li_info) {
2772 mutex_unlock(&ext4_li_mtx);
bfff6873 2773 return;
1bb933fb 2774 }
bfff6873
LC		 2775
2776 mutex_lock(&ext4_li_info->li_list_mtx);
1bb933fb 2777 ext4_remove_li_request(EXT4_SB(sb)->s_li_request);
bfff6873 2778 mutex_unlock(&ext4_li_info->li_list_mtx);
1bb933fb 2779 mutex_unlock(&ext4_li_mtx);
bfff6873
LC		 2780}
2781
8f1f7453
ES		 2782static struct task_struct *ext4_lazyinit_task;
2783
bfff6873
LC		 2784/*
2785 * This is the function where ext4lazyinit thread lives. It walks
2786 * through the request list searching for next scheduled filesystem.
2787 * When such a fs is found, run the lazy initialization request
2788 * (ext4_rn_li_request) and keep track of the time spend in this
2789 * function. Based on that time we compute next schedule time of
2790 * the request. When walking through the list is complete, compute
2791 * next waking time and put itself into sleep.
2792 */
2793static int ext4_lazyinit_thread(void *arg)
2794{
2795 struct ext4_lazy_init *eli = (struct ext4_lazy_init *)arg;
2796 struct list_head *pos, *n;
2797 struct ext4_li_request *elr;
4ed5c033 2798 unsigned long next_wakeup, cur;
bfff6873
LC		 2799
2800 BUG_ON(NULL == eli);
2801
bfff6873
LC		 2802cont_thread:
2803 while (true) {
2804 next_wakeup = MAX_JIFFY_OFFSET;
2805
2806 mutex_lock(&eli->li_list_mtx);
2807 if (list_empty(&eli->li_request_list)) {
2808 mutex_unlock(&eli->li_list_mtx);
2809 goto exit_thread;
2810 }
2811
2812 list_for_each_safe(pos, n, &eli->li_request_list) {
2813 elr = list_entry(pos, struct ext4_li_request,
2814 lr_request);
2815
b2c78cd0
TT		 2816 if (time_after_eq(jiffies, elr->lr_next_sched)) {
2817 if (ext4_run_li_request(elr) != 0) {
2818 /* error, remove the lazy_init job */
2819 ext4_remove_li_request(elr);
2820 continue;
2821 }
bfff6873
LC		 2822 }
2823
2824 if (time_before(elr->lr_next_sched, next_wakeup))
2825 next_wakeup = elr->lr_next_sched;
2826 }
2827 mutex_unlock(&eli->li_list_mtx);
2828
a0acae0e 2829 try_to_freeze();
bfff6873 2830
4ed5c033
LC		 2831 cur = jiffies;
2832 if ((time_after_eq(cur, next_wakeup)) ||
f4245bd4 2833 (MAX_JIFFY_OFFSET == next_wakeup)) {
bfff6873
LC		 2834 cond_resched();
2835 continue;
2836 }
2837
4ed5c033
LC		 2838 schedule_timeout_interruptible(next_wakeup - cur);
2839
8f1f7453
ES		 2840 if (kthread_should_stop()) {
2841 ext4_clear_request_list();
2842 goto exit_thread;
2843 }
bfff6873
LC		 2844 }
2845
2846exit_thread:
2847 /*
2848 * It looks like the request list is empty, but we need
2849 * to check it under the li_list_mtx lock, to prevent any
2850 * additions into it, and of course we should lock ext4_li_mtx
2851 * to atomically free the list and ext4_li_info, because at
2852 * this point another ext4 filesystem could be registering
2853 * new one.
2854 */
2855 mutex_lock(&ext4_li_mtx);
2856 mutex_lock(&eli->li_list_mtx);
2857 if (!list_empty(&eli->li_request_list)) {
2858 mutex_unlock(&eli->li_list_mtx);
2859 mutex_unlock(&ext4_li_mtx);
2860 goto cont_thread;
2861 }
2862 mutex_unlock(&eli->li_list_mtx);
bfff6873
LC		 2863 kfree(ext4_li_info);
2864 ext4_li_info = NULL;
2865 mutex_unlock(&ext4_li_mtx);
2866
2867 return 0;
2868}
2869
2870static void ext4_clear_request_list(void)
2871{
2872 struct list_head *pos, *n;
2873 struct ext4_li_request *elr;
2874
2875 mutex_lock(&ext4_li_info->li_list_mtx);
bfff6873
LC		 2876 list_for_each_safe(pos, n, &ext4_li_info->li_request_list) {
2877 elr = list_entry(pos, struct ext4_li_request,
2878 lr_request);
2879 ext4_remove_li_request(elr);
2880 }
2881 mutex_unlock(&ext4_li_info->li_list_mtx);
2882}
2883
2884static int ext4_run_lazyinit_thread(void)
2885{
8f1f7453
ES		 2886 ext4_lazyinit_task = kthread_run(ext4_lazyinit_thread,
2887 ext4_li_info, "ext4lazyinit");
2888 if (IS_ERR(ext4_lazyinit_task)) {
2889 int err = PTR_ERR(ext4_lazyinit_task);
bfff6873 2890 ext4_clear_request_list();
bfff6873
LC		 2891 kfree(ext4_li_info);
2892 ext4_li_info = NULL;
92b97816 2893 printk(KERN_CRIT "EXT4-fs: error %d creating inode table "
bfff6873
LC		 2894 "initialization thread\n",
2895 err);
2896 return err;
2897 }
2898 ext4_li_info->li_state |= EXT4_LAZYINIT_RUNNING;
bfff6873
LC		 2899 return 0;
2900}
2901
2902/*
2903 * Check whether it make sense to run itable init. thread or not.
2904 * If there is at least one uninitialized inode table, return
2905 * corresponding group number, else the loop goes through all
2906 * groups and return total number of groups.
2907 */
2908static ext4_group_t ext4_has_uninit_itable(struct super_block *sb)
2909{
2910 ext4_group_t group, ngroups = EXT4_SB(sb)->s_groups_count;
2911 struct ext4_group_desc *gdp = NULL;
2912
2913 for (group = 0; group < ngroups; group++) {
2914 gdp = ext4_get_group_desc(sb, group, NULL);
2915 if (!gdp)
2916 continue;
2917
2918 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2919 break;
2920 }
2921
2922 return group;
2923}
2924
2925static int ext4_li_info_new(void)
2926{
2927 struct ext4_lazy_init *eli = NULL;
2928
2929 eli = kzalloc(sizeof(*eli), GFP_KERNEL);
2930 if (!eli)
2931 return -ENOMEM;
2932
bfff6873
LC		 2933 INIT_LIST_HEAD(&eli->li_request_list);
2934 mutex_init(&eli->li_list_mtx);
2935
bfff6873
LC		 2936 eli->li_state |= EXT4_LAZYINIT_QUIT;
2937
2938 ext4_li_info = eli;
2939
2940 return 0;
2941}
2942
2943static struct ext4_li_request *ext4_li_request_new(struct super_block *sb,
2944 ext4_group_t start)
2945{
2946 struct ext4_sb_info *sbi = EXT4_SB(sb);
2947 struct ext4_li_request *elr;
2948 unsigned long rnd;
2949
2950 elr = kzalloc(sizeof(*elr), GFP_KERNEL);
2951 if (!elr)
2952 return NULL;
2953
2954 elr->lr_super = sb;
2955 elr->lr_sbi = sbi;
2956 elr->lr_next_group = start;
2957
2958 /*
2959 * Randomize first schedule time of the request to
2960 * spread the inode table initialization requests
2961 * better.
2962 */
2963 get_random_bytes(&rnd, sizeof(rnd));
2964 elr->lr_next_sched = jiffies + (unsigned long)rnd %
2965 (EXT4_DEF_LI_MAX_START_DELAY * HZ);
2966
2967 return elr;
2968}
2969
7f511862
TT		 2970int ext4_register_li_request(struct super_block *sb,
2971 ext4_group_t first_not_zeroed)
bfff6873
LC		 2972{
2973 struct ext4_sb_info *sbi = EXT4_SB(sb);
7f511862 2974 struct ext4_li_request *elr = NULL;
bfff6873 2975 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
6c5a6cb9 2976 int ret = 0;
bfff6873 2977
7f511862 2978 mutex_lock(&ext4_li_mtx);
51ce6511
LC		 2979 if (sbi->s_li_request != NULL) {
2980 /*
2981 * Reset timeout so it can be computed again, because
2982 * s_li_wait_mult might have changed.
2983 */
2984 sbi->s_li_request->lr_timeout = 0;
7f511862 2985 goto out;
51ce6511 2986 }
bfff6873
LC		 2987
2988 if (first_not_zeroed == ngroups ||
2989 (sb->s_flags & MS_RDONLY) ||
55ff3840 2990 !test_opt(sb, INIT_INODE_TABLE))
7f511862 2991 goto out;
bfff6873
LC		 2992
2993 elr = ext4_li_request_new(sb, first_not_zeroed);
7f511862
TT		 2994 if (!elr) {
2995 ret = -ENOMEM;
2996 goto out;
2997 }
bfff6873
LC		 2998
2999 if (NULL == ext4_li_info) {
3000 ret = ext4_li_info_new();
3001 if (ret)
3002 goto out;
3003 }
3004
3005 mutex_lock(&ext4_li_info->li_list_mtx);
3006 list_add(&elr->lr_request, &ext4_li_info->li_request_list);
3007 mutex_unlock(&ext4_li_info->li_list_mtx);
3008
3009 sbi->s_li_request = elr;
46e4690b
TM		 3010 /*
3011 * set elr to NULL here since it has been inserted to
3012 * the request_list and the removal and free of it is
3013 * handled by ext4_clear_request_list from now on.
3014 */
3015 elr = NULL;
bfff6873
LC		 3016
3017 if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) {
3018 ret = ext4_run_lazyinit_thread();
3019 if (ret)
3020 goto out;
3021 }
bfff6873 3022out:
beed5ecb
NK		 3023 mutex_unlock(&ext4_li_mtx);
3024 if (ret)
bfff6873 3025 kfree(elr);
bfff6873
LC		 3026 return ret;
3027}
3028
3029/*
3030 * We do not need to lock anything since this is called on
3031 * module unload.
3032 */
3033static void ext4_destroy_lazyinit_thread(void)
3034{
3035 /*
3036 * If thread exited earlier
3037 * there's nothing to be done.
3038 */
8f1f7453 3039 if (!ext4_li_info || !ext4_lazyinit_task)
bfff6873
LC		 3040 return;
3041
8f1f7453 3042 kthread_stop(ext4_lazyinit_task);
bfff6873
LC		 3043}
3044
25ed6e8a
DW		 3045static int set_journal_csum_feature_set(struct super_block *sb)
3046{
3047 int ret = 1;
3048 int compat, incompat;
3049 struct ext4_sb_info *sbi = EXT4_SB(sb);
3050
3051 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3052 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) {
3053 /* journal checksum v2 */
3054 compat = 0;
3055 incompat = JBD2_FEATURE_INCOMPAT_CSUM_V2;
3056 } else {
3057 /* journal checksum v1 */
3058 compat = JBD2_FEATURE_COMPAT_CHECKSUM;
3059 incompat = 0;
3060 }
3061
3062 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
3063 ret = jbd2_journal_set_features(sbi->s_journal,
3064 compat, 0,
3065 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT |
3066 incompat);
3067 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
3068 ret = jbd2_journal_set_features(sbi->s_journal,
3069 compat, 0,
3070 incompat);
3071 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
3072 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
3073 } else {
3074 jbd2_journal_clear_features(sbi->s_journal,
3075 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
3076 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT |
3077 JBD2_FEATURE_INCOMPAT_CSUM_V2);
3078 }
3079
3080 return ret;
3081}
3082
952fc18e
TT		 3083/*
3084 * Note: calculating the overhead so we can be compatible with
3085 * historical BSD practice is quite difficult in the face of
3086 * clusters/bigalloc. This is because multiple metadata blocks from
3087 * different block group can end up in the same allocation cluster.
3088 * Calculating the exact overhead in the face of clustered allocation
3089 * requires either O(all block bitmaps) in memory or O(number of block
3090 * groups**2) in time. We will still calculate the superblock for
3091 * older file systems --- and if we come across with a bigalloc file
3092 * system with zero in s_overhead_clusters the estimate will be close to
3093 * correct especially for very large cluster sizes --- but for newer
3094 * file systems, it's better to calculate this figure once at mkfs
3095 * time, and store it in the superblock. If the superblock value is
3096 * present (even for non-bigalloc file systems), we will use it.
3097 */
3098static int count_overhead(struct super_block *sb, ext4_group_t grp,
3099 char *buf)
3100{
3101 struct ext4_sb_info *sbi = EXT4_SB(sb);
3102 struct ext4_group_desc *gdp;
3103 ext4_fsblk_t first_block, last_block, b;
3104 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3105 int s, j, count = 0;
3106
0548bbb8
TT		 3107 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_BIGALLOC))
3108 return (ext4_bg_has_super(sb, grp) + ext4_bg_num_gdb(sb, grp) +
3109 sbi->s_itb_per_group + 2);
3110
952fc18e
TT		 3111 first_block = le32_to_cpu(sbi->s_es->s_first_data_block) +
3112 (grp * EXT4_BLOCKS_PER_GROUP(sb));
3113 last_block = first_block + EXT4_BLOCKS_PER_GROUP(sb) - 1;
3114 for (i = 0; i < ngroups; i++) {
3115 gdp = ext4_get_group_desc(sb, i, NULL);
3116 b = ext4_block_bitmap(sb, gdp);
3117 if (b >= first_block && b <= last_block) {
3118 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3119 count++;
3120 }
3121 b = ext4_inode_bitmap(sb, gdp);
3122 if (b >= first_block && b <= last_block) {
3123 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3124 count++;
3125 }
3126 b = ext4_inode_table(sb, gdp);
3127 if (b >= first_block && b + sbi->s_itb_per_group <= last_block)
3128 for (j = 0; j < sbi->s_itb_per_group; j++, b++) {
3129 int c = EXT4_B2C(sbi, b - first_block);
3130 ext4_set_bit(c, buf);
3131 count++;
3132 }
3133 if (i != grp)
3134 continue;
3135 s = 0;
3136 if (ext4_bg_has_super(sb, grp)) {
3137 ext4_set_bit(s++, buf);
3138 count++;
3139 }
3140 for (j = ext4_bg_num_gdb(sb, grp); j > 0; j--) {
3141 ext4_set_bit(EXT4_B2C(sbi, s++), buf);
3142 count++;
3143 }
3144 }
3145 if (!count)
3146 return 0;
3147 return EXT4_CLUSTERS_PER_GROUP(sb) -
3148 ext4_count_free(buf, EXT4_CLUSTERS_PER_GROUP(sb) / 8);
3149}
3150
3151/*
3152 * Compute the overhead and stash it in sbi->s_overhead
3153 */
3154int ext4_calculate_overhead(struct super_block *sb)
3155{
3156 struct ext4_sb_info *sbi = EXT4_SB(sb);
3157 struct ext4_super_block *es = sbi->s_es;
3158 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3159 ext4_fsblk_t overhead = 0;
3160 char *buf = (char *) get_zeroed_page(GFP_KERNEL);
3161
952fc18e
TT		 3162 if (!buf)
3163 return -ENOMEM;
3164
3165 /*
3166 * Compute the overhead (FS structures). This is constant
3167 * for a given filesystem unless the number of block groups
3168 * changes so we cache the previous value until it does.
3169 */
3170
3171 /*
3172 * All of the blocks before first_data_block are overhead
3173 */
3174 overhead = EXT4_B2C(sbi, le32_to_cpu(es->s_first_data_block));
3175
3176 /*
3177 * Add the overhead found in each block group
3178 */
3179 for (i = 0; i < ngroups; i++) {
3180 int blks;
3181
3182 blks = count_overhead(sb, i, buf);
3183 overhead += blks;
3184 if (blks)
3185 memset(buf, 0, PAGE_SIZE);
3186 cond_resched();
3187 }
0875a2b4
ES		 3188 /* Add the journal blocks as well */
3189 if (sbi->s_journal)
810da240 3190 overhead += EXT4_NUM_B2C(sbi, sbi->s_journal->j_maxlen);
0875a2b4 3191
952fc18e
TT		 3192 sbi->s_overhead = overhead;
3193 smp_wmb();
3194 free_page((unsigned long) buf);
3195 return 0;
3196}
3197
2b2d6d01 3198static int ext4_fill_super(struct super_block *sb, void *data, int silent)
ac27a0ec 3199{
d4c402d9 3200 char *orig_data = kstrdup(data, GFP_KERNEL);
2b2d6d01 3201 struct buffer_head *bh;
617ba13b
MC		 3202 struct ext4_super_block *es = NULL;
3203 struct ext4_sb_info *sbi;
3204 ext4_fsblk_t block;
3205 ext4_fsblk_t sb_block = get_sb_block(&data);
70bbb3e0 3206 ext4_fsblk_t logical_sb_block;
ac27a0ec 3207 unsigned long offset = 0;
ac27a0ec
DK		 3208 unsigned long journal_devnum = 0;
3209 unsigned long def_mount_opts;
3210 struct inode *root;
9f6200bb 3211 char *cp;
0390131b 3212 const char *descr;
dcc7dae3 3213 int ret = -ENOMEM;
281b5995 3214 int blocksize, clustersize;
4ec11028
TT		 3215 unsigned int db_count;
3216 unsigned int i;
281b5995 3217 int needs_recovery, has_huge_files, has_bigalloc;
bd81d8ee 3218 __u64 blocks_count;
07aa2ea1 3219 int err = 0;
b3881f74 3220 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
bfff6873 3221 ext4_group_t first_not_zeroed;
ac27a0ec
DK		 3222
3223 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
3224 if (!sbi)
dcc7dae3 3225 goto out_free_orig;
705895b6
PE		 3226
3227 sbi->s_blockgroup_lock =
3228 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
3229 if (!sbi->s_blockgroup_lock) {
3230 kfree(sbi);
dcc7dae3 3231 goto out_free_orig;
705895b6 3232 }
ac27a0ec 3233 sb->s_fs_info = sbi;
2c0544b2 3234 sbi->s_sb = sb;
240799cd 3235 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
d9c9bef1 3236 sbi->s_sb_block = sb_block;
f613dfcb
TT		 3237 if (sb->s_bdev->bd_part)
3238 sbi->s_sectors_written_start =
3239 part_stat_read(sb->s_bdev->bd_part, sectors[1]);
ac27a0ec 3240
9f6200bb
TT		 3241 /* Cleanup superblock name */
3242 for (cp = sb->s_id; (cp = strchr(cp, '/'));)
3243 *cp = '!';
3244
07aa2ea1 3245 /* -EINVAL is default */
dcc7dae3 3246 ret = -EINVAL;
617ba13b 3247 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
ac27a0ec 3248 if (!blocksize) {
b31e1552 3249 ext4_msg(sb, KERN_ERR, "unable to set blocksize");
ac27a0ec
DK		 3250 goto out_fail;
3251 }
3252
3253 /*
617ba13b 3254 * The ext4 superblock will not be buffer aligned for other than 1kB
ac27a0ec
DK		 3255 * block sizes. We need to calculate the offset from buffer start.
3256 */
617ba13b 3257 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
70bbb3e0
AM		 3258 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3259 offset = do_div(logical_sb_block, blocksize);
ac27a0ec 3260 } else {
70bbb3e0 3261 logical_sb_block = sb_block;
ac27a0ec
DK		 3262 }
3263
70bbb3e0 3264 if (!(bh = sb_bread(sb, logical_sb_block))) {
b31e1552 3265 ext4_msg(sb, KERN_ERR, "unable to read superblock");
ac27a0ec
DK		 3266 goto out_fail;
3267 }
3268 /*
3269 * Note: s_es must be initialized as soon as possible because
617ba13b 3270 * some ext4 macro-instructions depend on its value
ac27a0ec 3271 */
2716b802 3272 es = (struct ext4_super_block *) (bh->b_data + offset);
ac27a0ec
DK		 3273 sbi->s_es = es;
3274 sb->s_magic = le16_to_cpu(es->s_magic);
617ba13b
MC		 3275 if (sb->s_magic != EXT4_SUPER_MAGIC)
3276 goto cantfind_ext4;
afc32f7e 3277 sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
ac27a0ec 3278
feb0ab32
DW		 3279 /* Warn if metadata_csum and gdt_csum are both set. */
3280 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3281 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) &&
3282 EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_GDT_CSUM))
3283 ext4_warning(sb, KERN_INFO "metadata_csum and uninit_bg are "
3284 "redundant flags; please run fsck.");
3285
d25425f8
DW		 3286 /* Check for a known checksum algorithm */
3287 if (!ext4_verify_csum_type(sb, es)) {
3288 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3289 "unknown checksum algorithm.");
3290 silent = 1;
3291 goto cantfind_ext4;
3292 }
3293
0441984a
DW		 3294 /* Load the checksum driver */
3295 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3296 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) {
3297 sbi->s_chksum_driver = crypto_alloc_shash("crc32c", 0, 0);
3298 if (IS_ERR(sbi->s_chksum_driver)) {
3299 ext4_msg(sb, KERN_ERR, "Cannot load crc32c driver.");
3300 ret = PTR_ERR(sbi->s_chksum_driver);
3301 sbi->s_chksum_driver = NULL;
3302 goto failed_mount;
3303 }
3304 }
3305
a9c47317
DW		 3306 /* Check superblock checksum */
3307 if (!ext4_superblock_csum_verify(sb, es)) {
3308 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3309 "invalid superblock checksum. Run e2fsck?");
3310 silent = 1;
3311 goto cantfind_ext4;
3312 }
3313
3314 /* Precompute checksum seed for all metadata */
3315 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3316 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
3317 sbi->s_csum_seed = ext4_chksum(sbi, ~0, es->s_uuid,
3318 sizeof(es->s_uuid));
3319
ac27a0ec
DK		 3320 /* Set defaults before we parse the mount options */
3321 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
fd8c37ec 3322 set_opt(sb, INIT_INODE_TABLE);
617ba13b 3323 if (def_mount_opts & EXT4_DEFM_DEBUG)
fd8c37ec 3324 set_opt(sb, DEBUG);
87f26807 3325 if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
fd8c37ec 3326 set_opt(sb, GRPID);
617ba13b 3327 if (def_mount_opts & EXT4_DEFM_UID16)
fd8c37ec 3328 set_opt(sb, NO_UID32);
ea663336 3329 /* xattr user namespace & acls are now defaulted on */
ea663336 3330 set_opt(sb, XATTR_USER);
03010a33 3331#ifdef CONFIG_EXT4_FS_POSIX_ACL
ea663336 3332 set_opt(sb, POSIX_ACL);
2e7842b8 3333#endif
617ba13b 3334 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
fd8c37ec 3335 set_opt(sb, JOURNAL_DATA);
617ba13b 3336 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
fd8c37ec 3337 set_opt(sb, ORDERED_DATA);
617ba13b 3338 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
fd8c37ec 3339 set_opt(sb, WRITEBACK_DATA);
617ba13b
MC		 3340
3341 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
fd8c37ec 3342 set_opt(sb, ERRORS_PANIC);
bb4f397a 3343 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
fd8c37ec 3344 set_opt(sb, ERRORS_CONT);
bb4f397a 3345 else
fd8c37ec 3346 set_opt(sb, ERRORS_RO);
8b67f04a 3347 if (def_mount_opts & EXT4_DEFM_BLOCK_VALIDITY)
fd8c37ec 3348 set_opt(sb, BLOCK_VALIDITY);
8b67f04a 3349 if (def_mount_opts & EXT4_DEFM_DISCARD)
fd8c37ec 3350 set_opt(sb, DISCARD);
ac27a0ec 3351
08cefc7a
EB		 3352 sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));
3353 sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid));
30773840
TT		 3354 sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
3355 sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
3356 sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
ac27a0ec 3357
8b67f04a 3358 if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0)
fd8c37ec 3359 set_opt(sb, BARRIER);
ac27a0ec 3360
dd919b98
AK		 3361 /*
3362 * enable delayed allocation by default
3363 * Use -o nodelalloc to turn it off
3364 */
bc0b75f7 3365 if (!IS_EXT3_SB(sb) && !IS_EXT2_SB(sb) &&
8b67f04a 3366 ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0))
fd8c37ec 3367 set_opt(sb, DELALLOC);
dd919b98 3368
51ce6511
LC		 3369 /*
3370 * set default s_li_wait_mult for lazyinit, for the case there is
3371 * no mount option specified.
3372 */
3373 sbi->s_li_wait_mult = EXT4_DEF_LI_WAIT_MULT;
3374
8b67f04a 3375 if (!parse_options((char *) sbi->s_es->s_mount_opts, sb,
661aa520 3376 &journal_devnum, &journal_ioprio, 0)) {
8b67f04a
TT		 3377 ext4_msg(sb, KERN_WARNING,
3378 "failed to parse options in superblock: %s",
3379 sbi->s_es->s_mount_opts);
3380 }
5a916be1 3381 sbi->s_def_mount_opt = sbi->s_mount_opt;
b3881f74 3382 if (!parse_options((char *) data, sb, &journal_devnum,
661aa520 3383 &journal_ioprio, 0))
ac27a0ec
DK		 3384 goto failed_mount;
3385
56889787
TT		 3386 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
3387 printk_once(KERN_WARNING "EXT4-fs: Warning: mounting "
3388 "with data=journal disables delayed "
3389 "allocation and O_DIRECT support!\n");
3390 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
3391 ext4_msg(sb, KERN_ERR, "can't mount with "
3392 "both data=journal and delalloc");
3393 goto failed_mount;
3394 }
3395 if (test_opt(sb, DIOREAD_NOLOCK)) {
3396 ext4_msg(sb, KERN_ERR, "can't mount with "
3397 "both data=journal and delalloc");
3398 goto failed_mount;
3399 }
3400 if (test_opt(sb, DELALLOC))
3401 clear_opt(sb, DELALLOC);
3402 }
3403
ac27a0ec 3404 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
482a7425 3405 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec 3406
617ba13b
MC		 3407 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
3408 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
3409 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
3410 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
b31e1552
ES		 3411 ext4_msg(sb, KERN_WARNING,
3412 "feature flags set on rev 0 fs, "
3413 "running e2fsck is recommended");
469108ff 3414
2035e776
TT		 3415 if (IS_EXT2_SB(sb)) {
3416 if (ext2_feature_set_ok(sb))
3417 ext4_msg(sb, KERN_INFO, "mounting ext2 file system "
3418 "using the ext4 subsystem");
3419 else {
3420 ext4_msg(sb, KERN_ERR, "couldn't mount as ext2 due "
3421 "to feature incompatibilities");
3422 goto failed_mount;
3423 }
3424 }
3425
3426 if (IS_EXT3_SB(sb)) {
3427 if (ext3_feature_set_ok(sb))
3428 ext4_msg(sb, KERN_INFO, "mounting ext3 file system "
3429 "using the ext4 subsystem");
3430 else {
3431 ext4_msg(sb, KERN_ERR, "couldn't mount as ext3 due "
3432 "to feature incompatibilities");
3433 goto failed_mount;
3434 }
3435 }
3436
ac27a0ec
DK		 3437 /*
3438 * Check feature flags regardless of the revision level, since we
3439 * previously didn't change the revision level when setting the flags,
3440 * so there is a chance incompat flags are set on a rev 0 filesystem.
3441 */
a13fb1a4 3442 if (!ext4_feature_set_ok(sb, (sb->s_flags & MS_RDONLY)))
ac27a0ec 3443 goto failed_mount;
a13fb1a4 3444
261cb20c 3445 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
617ba13b
MC		 3446 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
3447 blocksize > EXT4_MAX_BLOCK_SIZE) {
b31e1552
ES		 3448 ext4_msg(sb, KERN_ERR,
3449 "Unsupported filesystem blocksize %d", blocksize);
ac27a0ec
DK		 3450 goto failed_mount;
3451 }
3452
ac27a0ec 3453 if (sb->s_blocksize != blocksize) {
ce40733c
AK		 3454 /* Validate the filesystem blocksize */
3455 if (!sb_set_blocksize(sb, blocksize)) {
b31e1552 3456 ext4_msg(sb, KERN_ERR, "bad block size %d",
ce40733c 3457 blocksize);
ac27a0ec
DK		 3458 goto failed_mount;
3459 }
3460
2b2d6d01 3461 brelse(bh);
70bbb3e0
AM		 3462 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3463 offset = do_div(logical_sb_block, blocksize);
3464 bh = sb_bread(sb, logical_sb_block);
ac27a0ec 3465 if (!bh) {
b31e1552
ES		 3466 ext4_msg(sb, KERN_ERR,
3467 "Can't read superblock on 2nd try");
ac27a0ec
DK		 3468 goto failed_mount;
3469 }
2716b802 3470 es = (struct ext4_super_block *)(bh->b_data + offset);
ac27a0ec 3471 sbi->s_es = es;
617ba13b 3472 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
b31e1552
ES		 3473 ext4_msg(sb, KERN_ERR,
3474 "Magic mismatch, very weird!");
ac27a0ec
DK		 3475 goto failed_mount;
3476 }
3477 }
3478
a13fb1a4
ES		 3479 has_huge_files = EXT4_HAS_RO_COMPAT_FEATURE(sb,
3480 EXT4_FEATURE_RO_COMPAT_HUGE_FILE);
f287a1a5
TT		 3481 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
3482 has_huge_files);
3483 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
ac27a0ec 3484
617ba13b
MC		 3485 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
3486 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
3487 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
ac27a0ec
DK		 3488 } else {
3489 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
3490 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
617ba13b 3491 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
1330593e 3492 (!is_power_of_2(sbi->s_inode_size)) ||
ac27a0ec 3493 (sbi->s_inode_size > blocksize)) {
b31e1552
ES		 3494 ext4_msg(sb, KERN_ERR,
3495 "unsupported inode size: %d",
2b2d6d01 3496 sbi->s_inode_size);
ac27a0ec
DK		 3497 goto failed_mount;
3498 }
ef7f3835
KS		 3499 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
3500 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
ac27a0ec 3501 }
0b8e58a1 3502
0d1ee42f
AR		 3503 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
3504 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
8fadc143 3505 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
0d1ee42f 3506 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
d8ea6cf8 3507 !is_power_of_2(sbi->s_desc_size)) {
b31e1552
ES		 3508 ext4_msg(sb, KERN_ERR,
3509 "unsupported descriptor size %lu",
0d1ee42f
AR		 3510 sbi->s_desc_size);
3511 goto failed_mount;
3512 }
3513 } else
3514 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
0b8e58a1 3515
ac27a0ec 3516 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
ac27a0ec 3517 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
b47b6f38 3518 if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
617ba13b 3519 goto cantfind_ext4;
0b8e58a1 3520
617ba13b 3521 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
ac27a0ec 3522 if (sbi->s_inodes_per_block == 0)
617ba13b 3523 goto cantfind_ext4;
ac27a0ec
DK		 3524 sbi->s_itb_per_group = sbi->s_inodes_per_group /
3525 sbi->s_inodes_per_block;
0d1ee42f 3526 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
ac27a0ec
DK		 3527 sbi->s_sbh = bh;
3528 sbi->s_mount_state = le16_to_cpu(es->s_state);
e57aa839
FW		 3529 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
3530 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
0b8e58a1 3531
2b2d6d01 3532 for (i = 0; i < 4; i++)
ac27a0ec
DK		 3533 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
3534 sbi->s_def_hash_version = es->s_def_hash_version;
f99b2589
TT		 3535 i = le32_to_cpu(es->s_flags);
3536 if (i & EXT2_FLAGS_UNSIGNED_HASH)
3537 sbi->s_hash_unsigned = 3;
3538 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
3539#ifdef __CHAR_UNSIGNED__
3540 es->s_flags |= cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
3541 sbi->s_hash_unsigned = 3;
3542#else
3543 es->s_flags |= cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
3544#endif
f99b2589 3545 }
ac27a0ec 3546
281b5995
TT		 3547 /* Handle clustersize */
3548 clustersize = BLOCK_SIZE << le32_to_cpu(es->s_log_cluster_size);
3549 has_bigalloc = EXT4_HAS_RO_COMPAT_FEATURE(sb,
3550 EXT4_FEATURE_RO_COMPAT_BIGALLOC);
3551 if (has_bigalloc) {
3552 if (clustersize < blocksize) {
3553 ext4_msg(sb, KERN_ERR,
3554 "cluster size (%d) smaller than "
3555 "block size (%d)", clustersize, blocksize);
3556 goto failed_mount;
3557 }
3558 sbi->s_cluster_bits = le32_to_cpu(es->s_log_cluster_size) -
3559 le32_to_cpu(es->s_log_block_size);
3560 sbi->s_clusters_per_group =
3561 le32_to_cpu(es->s_clusters_per_group);
3562 if (sbi->s_clusters_per_group > blocksize * 8) {
3563 ext4_msg(sb, KERN_ERR,
3564 "#clusters per group too big: %lu",
3565 sbi->s_clusters_per_group);
3566 goto failed_mount;
3567 }
3568 if (sbi->s_blocks_per_group !=
3569 (sbi->s_clusters_per_group * (clustersize / blocksize))) {
3570 ext4_msg(sb, KERN_ERR, "blocks per group (%lu) and "
3571 "clusters per group (%lu) inconsistent",
3572 sbi->s_blocks_per_group,
3573 sbi->s_clusters_per_group);
3574 goto failed_mount;
3575 }
3576 } else {
3577 if (clustersize != blocksize) {
3578 ext4_warning(sb, "fragment/cluster size (%d) != "
3579 "block size (%d)", clustersize,
3580 blocksize);
3581 clustersize = blocksize;
3582 }
3583 if (sbi->s_blocks_per_group > blocksize * 8) {
3584 ext4_msg(sb, KERN_ERR,
3585 "#blocks per group too big: %lu",
3586 sbi->s_blocks_per_group);
3587 goto failed_mount;
3588 }
3589 sbi->s_clusters_per_group = sbi->s_blocks_per_group;
3590 sbi->s_cluster_bits = 0;
ac27a0ec 3591 }
281b5995
TT		 3592 sbi->s_cluster_ratio = clustersize / blocksize;
3593
ac27a0ec 3594 if (sbi->s_inodes_per_group > blocksize * 8) {
b31e1552
ES		 3595 ext4_msg(sb, KERN_ERR,
3596 "#inodes per group too big: %lu",
2b2d6d01 3597 sbi->s_inodes_per_group);
ac27a0ec
DK		 3598 goto failed_mount;
3599 }
3600
bf43d84b
ES		 3601 /*
3602 * Test whether we have more sectors than will fit in sector_t,
3603 * and whether the max offset is addressable by the page cache.
3604 */
5a9ae68a 3605 err = generic_check_addressable(sb->s_blocksize_bits,
30ca22c7 3606 ext4_blocks_count(es));
5a9ae68a 3607 if (err) {
b31e1552 3608 ext4_msg(sb, KERN_ERR, "filesystem"
bf43d84b 3609 " too large to mount safely on this system");
ac27a0ec 3610 if (sizeof(sector_t) < 8)
90c699a9 3611 ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled");
ac27a0ec
DK		 3612 goto failed_mount;
3613 }
3614
617ba13b
MC		 3615 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
3616 goto cantfind_ext4;
e7c95593 3617
0f2ddca6
FTN		 3618 /* check blocks count against device size */
3619 blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
3620 if (blocks_count && ext4_blocks_count(es) > blocks_count) {
b31e1552
ES		 3621 ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
3622 "exceeds size of device (%llu blocks)",
0f2ddca6
FTN		 3623 ext4_blocks_count(es), blocks_count);
3624 goto failed_mount;
3625 }
3626
0b8e58a1
AD		 3627 /*
3628 * It makes no sense for the first data block to be beyond the end
3629 * of the filesystem.
3630 */
3631 if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
5635a62b 3632 ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
b31e1552
ES		 3633 "block %u is beyond end of filesystem (%llu)",
3634 le32_to_cpu(es->s_first_data_block),
3635 ext4_blocks_count(es));
e7c95593
ES		 3636 goto failed_mount;
3637 }
bd81d8ee
LV		 3638 blocks_count = (ext4_blocks_count(es) -
3639 le32_to_cpu(es->s_first_data_block) +
3640 EXT4_BLOCKS_PER_GROUP(sb) - 1);
3641 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
4ec11028 3642 if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
b31e1552 3643 ext4_msg(sb, KERN_WARNING, "groups count too large: %u "
4ec11028 3644 "(block count %llu, first data block %u, "
b31e1552 3645 "blocks per group %lu)", sbi->s_groups_count,
4ec11028
TT		 3646 ext4_blocks_count(es),
3647 le32_to_cpu(es->s_first_data_block),
3648 EXT4_BLOCKS_PER_GROUP(sb));
3649 goto failed_mount;
3650 }
bd81d8ee 3651 sbi->s_groups_count = blocks_count;
fb0a387d
ES		 3652 sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
3653 (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
617ba13b
MC		 3654 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
3655 EXT4_DESC_PER_BLOCK(sb);
f18a5f21
TT		 3656 sbi->s_group_desc = ext4_kvmalloc(db_count *
3657 sizeof(struct buffer_head *),
3658 GFP_KERNEL);
ac27a0ec 3659 if (sbi->s_group_desc == NULL) {
b31e1552 3660 ext4_msg(sb, KERN_ERR, "not enough memory");
2cde417d 3661 ret = -ENOMEM;
ac27a0ec
DK		 3662 goto failed_mount;
3663 }
3664
9f6200bb
TT		 3665 if (ext4_proc_root)
3666 sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);
240799cd 3667
66acdcf4
TT		 3668 if (sbi->s_proc)
3669 proc_create_data("options", S_IRUGO, sbi->s_proc,
3670 &ext4_seq_options_fops, sb);
3671
705895b6 3672 bgl_lock_init(sbi->s_blockgroup_lock);
ac27a0ec
DK		 3673
3674 for (i = 0; i < db_count; i++) {
70bbb3e0 3675 block = descriptor_loc(sb, logical_sb_block, i);
ac27a0ec
DK		 3676 sbi->s_group_desc[i] = sb_bread(sb, block);
3677 if (!sbi->s_group_desc[i]) {
b31e1552
ES		 3678 ext4_msg(sb, KERN_ERR,
3679 "can't read group descriptor %d", i);
ac27a0ec
DK		 3680 db_count = i;
3681 goto failed_mount2;
3682 }
3683 }
bfff6873 3684 if (!ext4_check_descriptors(sb, &first_not_zeroed)) {
b31e1552 3685 ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
ac27a0ec
DK		 3686 goto failed_mount2;
3687 }
772cb7c8
JS		 3688 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
3689 if (!ext4_fill_flex_info(sb)) {
b31e1552
ES		 3690 ext4_msg(sb, KERN_ERR,
3691 "unable to initialize "
3692 "flex_bg meta info!");
772cb7c8
JS		 3693 goto failed_mount2;
3694 }
3695
ac27a0ec
DK		 3696 sbi->s_gdb_count = db_count;
3697 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
3698 spin_lock_init(&sbi->s_next_gen_lock);
3699
04496411
TM		 3700 init_timer(&sbi->s_err_report);
3701 sbi->s_err_report.function = print_daily_error_info;
3702 sbi->s_err_report.data = (unsigned long) sb;
3703
57042651 3704 err = percpu_counter_init(&sbi->s_freeclusters_counter,
5dee5437 3705 ext4_count_free_clusters(sb));
ce7e010a
TT		 3706 if (!err) {
3707 err = percpu_counter_init(&sbi->s_freeinodes_counter,
3708 ext4_count_free_inodes(sb));
3709 }
3710 if (!err) {
3711 err = percpu_counter_init(&sbi->s_dirs_counter,
3712 ext4_count_dirs(sb));
3713 }
3714 if (!err) {
57042651 3715 err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0);
ce7e010a 3716 }
1ac6466f
TT		 3717 if (!err) {
3718 err = percpu_counter_init(&sbi->s_extent_cache_cnt, 0);
3719 }
ce7e010a
TT		 3720 if (err) {
3721 ext4_msg(sb, KERN_ERR, "insufficient memory");
3722 goto failed_mount3;
3723 }
3724
c9de560d 3725 sbi->s_stripe = ext4_get_stripe_size(sbi);
55138e0b 3726 sbi->s_max_writeback_mb_bump = 128;
67a5da56 3727 sbi->s_extent_max_zeroout_kb = 32;
c9de560d 3728
74cd15cd
ZL		 3729 /* Register extent status tree shrinker */
3730 ext4_es_register_shrinker(sb);
3731
ac27a0ec
DK		 3732 /*
3733 * set up enough so that it can read an inode
3734 */
9ca92389
TT		 3735 if (!test_opt(sb, NOLOAD) &&
3736 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
3737 sb->s_op = &ext4_sops;
3738 else
3739 sb->s_op = &ext4_nojournal_sops;
617ba13b
MC		 3740 sb->s_export_op = &ext4_export_ops;
3741 sb->s_xattr = ext4_xattr_handlers;
ac27a0ec 3742#ifdef CONFIG_QUOTA
617ba13b 3743 sb->dq_op = &ext4_quota_operations;
262b4662 3744 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA))
7c319d32 3745 sb->s_qcop = &ext4_qctl_sysfile_operations;
262b4662
JK		 3746 else
3747 sb->s_qcop = &ext4_qctl_operations;
ac27a0ec 3748#endif
f2fa2ffc
AK		 3749 memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
3750
ac27a0ec 3751 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
3b9d4ed2 3752 mutex_init(&sbi->s_orphan_lock);
ac27a0ec
DK		 3753
3754 sb->s_root = NULL;
3755
3756 needs_recovery = (es->s_last_orphan != 0 ||
617ba13b
MC		 3757 EXT4_HAS_INCOMPAT_FEATURE(sb,
3758 EXT4_FEATURE_INCOMPAT_RECOVER));
ac27a0ec 3759
c5e06d10
JL		 3760 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_MMP) &&
3761 !(sb->s_flags & MS_RDONLY))
3762 if (ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block)))
3763 goto failed_mount3;
3764
ac27a0ec
DK		 3765 /*
3766 * The first inode we look at is the journal inode. Don't try
3767 * root first: it may be modified in the journal!
3768 */
3769 if (!test_opt(sb, NOLOAD) &&
617ba13b
MC		 3770 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
3771 if (ext4_load_journal(sb, es, journal_devnum))
ac27a0ec 3772 goto failed_mount3;
0390131b
FM		 3773 } else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) &&
3774 EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
b31e1552
ES		 3775 ext4_msg(sb, KERN_ERR, "required journal recovery "
3776 "suppressed and not mounted read-only");
744692dc 3777 goto failed_mount_wq;
ac27a0ec 3778 } else {
fd8c37ec 3779 clear_opt(sb, DATA_FLAGS);
0390131b
FM		 3780 sbi->s_journal = NULL;
3781 needs_recovery = 0;
3782 goto no_journal;
ac27a0ec
DK		 3783 }
3784
f32aaf2d 3785 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT) &&
eb40a09c
JS		 3786 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
3787 JBD2_FEATURE_INCOMPAT_64BIT)) {
b31e1552 3788 ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
744692dc 3789 goto failed_mount_wq;
eb40a09c
JS		 3790 }
3791
25ed6e8a
DW		 3792 if (!set_journal_csum_feature_set(sb)) {
3793 ext4_msg(sb, KERN_ERR, "Failed to set journal checksum "
3794 "feature set");
3795 goto failed_mount_wq;
d4da6c9c 3796 }
818d276c 3797
ac27a0ec
DK		 3798 /* We have now updated the journal if required, so we can
3799 * validate the data journaling mode. */
3800 switch (test_opt(sb, DATA_FLAGS)) {
3801 case 0:
3802 /* No mode set, assume a default based on the journal
63f57933
AM		 3803 * capabilities: ORDERED_DATA if the journal can
3804 * cope, else JOURNAL_DATA
3805 */
dab291af
MC		 3806 if (jbd2_journal_check_available_features
3807 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
fd8c37ec 3808 set_opt(sb, ORDERED_DATA);
ac27a0ec 3809 else
fd8c37ec 3810 set_opt(sb, JOURNAL_DATA);
ac27a0ec
DK		 3811 break;
3812
617ba13b
MC		 3813 case EXT4_MOUNT_ORDERED_DATA:
3814 case EXT4_MOUNT_WRITEBACK_DATA:
dab291af
MC		 3815 if (!jbd2_journal_check_available_features
3816 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
b31e1552
ES		 3817 ext4_msg(sb, KERN_ERR, "Journal does not support "
3818 "requested data journaling mode");
744692dc 3819 goto failed_mount_wq;
ac27a0ec
DK		 3820 }
3821 default:
3822 break;
3823 }
b3881f74 3824 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
ac27a0ec 3825
18aadd47
BJ		 3826 sbi->s_journal->j_commit_callback = ext4_journal_commit_callback;
3827
ce7e010a
TT		 3828 /*
3829 * The journal may have updated the bg summary counts, so we
3830 * need to update the global counters.
3831 */
57042651 3832 percpu_counter_set(&sbi->s_freeclusters_counter,
5dee5437 3833 ext4_count_free_clusters(sb));
ce7e010a
TT		 3834 percpu_counter_set(&sbi->s_freeinodes_counter,
3835 ext4_count_free_inodes(sb));
3836 percpu_counter_set(&sbi->s_dirs_counter,
3837 ext4_count_dirs(sb));
57042651 3838 percpu_counter_set(&sbi->s_dirtyclusters_counter, 0);
206f7ab4 3839
ce7e010a 3840no_journal:
952fc18e
TT		 3841 /*
3842 * Get the # of file system overhead blocks from the
3843 * superblock if present.
3844 */
3845 if (es->s_overhead_clusters)
3846 sbi->s_overhead = le32_to_cpu(es->s_overhead_clusters);
3847 else {
07aa2ea1
LC		 3848 err = ext4_calculate_overhead(sb);
3849 if (err)
952fc18e
TT		 3850 goto failed_mount_wq;
3851 }
3852
fd89d5f2
TH		 3853 /*
3854 * The maximum number of concurrent works can be high and
3855 * concurrency isn't really necessary. Limit it to 1.
3856 */
3857 EXT4_SB(sb)->dio_unwritten_wq =
ae005cbe 3858 alloc_workqueue("ext4-dio-unwritten", WQ_MEM_RECLAIM | WQ_UNBOUND, 1);
4c0425ff
MC		 3859 if (!EXT4_SB(sb)->dio_unwritten_wq) {
3860 printk(KERN_ERR "EXT4-fs: failed to create DIO workqueue\n");
07aa2ea1 3861 ret = -ENOMEM;
4c0425ff
MC		 3862 goto failed_mount_wq;
3863 }
3864
ac27a0ec 3865 /*
dab291af 3866 * The jbd2_journal_load will have done any necessary log recovery,
ac27a0ec
DK		 3867 * so we can safely mount the rest of the filesystem now.
3868 */
3869
1d1fe1ee
DH		 3870 root = ext4_iget(sb, EXT4_ROOT_INO);
3871 if (IS_ERR(root)) {
b31e1552 3872 ext4_msg(sb, KERN_ERR, "get root inode failed");
1d1fe1ee 3873 ret = PTR_ERR(root);
32a9bb57 3874 root = NULL;
ac27a0ec
DK		 3875 goto failed_mount4;
3876 }
3877 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
b31e1552 3878 ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
94bf608a 3879 iput(root);
ac27a0ec
DK		 3880 goto failed_mount4;
3881 }
48fde701 3882 sb->s_root = d_make_root(root);
1d1fe1ee 3883 if (!sb->s_root) {
b31e1552 3884 ext4_msg(sb, KERN_ERR, "get root dentry failed");
1d1fe1ee
DH		 3885 ret = -ENOMEM;
3886 goto failed_mount4;
3887 }
ac27a0ec 3888
7e84b621
ES		 3889 if (ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY))
3890 sb->s_flags |= MS_RDONLY;
ef7f3835
KS		 3891
3892 /* determine the minimum size of new large inodes, if present */
3893 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
3894 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
3895 EXT4_GOOD_OLD_INODE_SIZE;
3896 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3897 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) {
3898 if (sbi->s_want_extra_isize <
3899 le16_to_cpu(es->s_want_extra_isize))
3900 sbi->s_want_extra_isize =
3901 le16_to_cpu(es->s_want_extra_isize);
3902 if (sbi->s_want_extra_isize <
3903 le16_to_cpu(es->s_min_extra_isize))
3904 sbi->s_want_extra_isize =
3905 le16_to_cpu(es->s_min_extra_isize);
3906 }
3907 }
3908 /* Check if enough inode space is available */
3909 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
3910 sbi->s_inode_size) {
3911 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
3912 EXT4_GOOD_OLD_INODE_SIZE;
b31e1552
ES		 3913 ext4_msg(sb, KERN_INFO, "required extra inode space not"
3914 "available");
ef7f3835
KS		 3915 }
3916
6fd058f7
TT		 3917 err = ext4_setup_system_zone(sb);
3918 if (err) {
b31e1552 3919 ext4_msg(sb, KERN_ERR, "failed to initialize system "
fbe845dd 3920 "zone (%d)", err);
94bf608a 3921 goto failed_mount4a;
6fd058f7
TT		 3922 }
3923
c2774d84 3924 ext4_ext_init(sb);
9d99012f 3925 err = ext4_mb_init(sb);
c2774d84 3926 if (err) {
421f91d2 3927 ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)",
b31e1552 3928 err);
dcf2d804 3929 goto failed_mount5;
c2774d84
AK		 3930 }
3931
bfff6873
LC		 3932 err = ext4_register_li_request(sb, first_not_zeroed);
3933 if (err)
dcf2d804 3934 goto failed_mount6;
bfff6873 3935
3197ebdb
TT		 3936 sbi->s_kobj.kset = ext4_kset;
3937 init_completion(&sbi->s_kobj_unregister);
3938 err = kobject_init_and_add(&sbi->s_kobj, &ext4_ktype, NULL,
3939 "%s", sb->s_id);
dcf2d804
TM		 3940 if (err)
3941 goto failed_mount7;
3197ebdb 3942
9b2ff357
JK		 3943#ifdef CONFIG_QUOTA
3944 /* Enable quota usage during mount. */
3945 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) &&
3946 !(sb->s_flags & MS_RDONLY)) {
3947 err = ext4_enable_quotas(sb);
3948 if (err)
3949 goto failed_mount8;
3950 }
3951#endif /* CONFIG_QUOTA */
3952
617ba13b
MC		 3953 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
3954 ext4_orphan_cleanup(sb, es);
3955 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
0390131b 3956 if (needs_recovery) {
b31e1552 3957 ext4_msg(sb, KERN_INFO, "recovery complete");
0390131b
FM		 3958 ext4_mark_recovery_complete(sb, es);
3959 }
3960 if (EXT4_SB(sb)->s_journal) {
3961 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
3962 descr = " journalled data mode";
3963 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
3964 descr = " ordered data mode";
3965 else
3966 descr = " writeback data mode";
3967 } else
3968 descr = "out journal";
3969
79add3a3
LC		 3970 if (test_opt(sb, DISCARD)) {
3971 struct request_queue *q = bdev_get_queue(sb->s_bdev);
3972 if (!blk_queue_discard(q))
3973 ext4_msg(sb, KERN_WARNING,
3974 "mounting with \"discard\" option, but "
3975 "the device does not support discard");
3976 }
3977
d4c402d9 3978 ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. "
8b67f04a
TT		 3979 "Opts: %s%s%s", descr, sbi->s_es->s_mount_opts,
3980 *sbi->s_es->s_mount_opts ? "; " : "", orig_data);
ac27a0ec 3981
66e61a9e
TT		 3982 if (es->s_error_count)
3983 mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */
ac27a0ec 3984
d4c402d9 3985 kfree(orig_data);
ac27a0ec
DK		 3986 return 0;
3987
617ba13b 3988cantfind_ext4:
ac27a0ec 3989 if (!silent)
b31e1552 3990 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
ac27a0ec
DK		 3991 goto failed_mount;
3992
72ba7450
TT		 3993#ifdef CONFIG_QUOTA
3994failed_mount8:
3995 kobject_del(&sbi->s_kobj);
3996#endif
dcf2d804
TM		 3997failed_mount7:
3998 ext4_unregister_li_request(sb);
3999failed_mount6:
dcf2d804 4000 ext4_mb_release(sb);
94bf608a
AV		 4001failed_mount5:
4002 ext4_ext_release(sb);
dcf2d804 4003 ext4_release_system_zone(sb);
94bf608a
AV		 4004failed_mount4a:
4005 dput(sb->s_root);
32a9bb57 4006 sb->s_root = NULL;
94bf608a 4007failed_mount4:
b31e1552 4008 ext4_msg(sb, KERN_ERR, "mount failed");
4c0425ff
MC		 4009 destroy_workqueue(EXT4_SB(sb)->dio_unwritten_wq);
4010failed_mount_wq:
0390131b
FM		 4011 if (sbi->s_journal) {
4012 jbd2_journal_destroy(sbi->s_journal);
4013 sbi->s_journal = NULL;
4014 }
ac27a0ec 4015failed_mount3:
04496411 4016 del_timer(&sbi->s_err_report);
9933fc0a
TT		 4017 if (sbi->s_flex_groups)
4018 ext4_kvfree(sbi->s_flex_groups);
57042651 4019 percpu_counter_destroy(&sbi->s_freeclusters_counter);
ce7e010a
TT		 4020 percpu_counter_destroy(&sbi->s_freeinodes_counter);
4021 percpu_counter_destroy(&sbi->s_dirs_counter);
57042651 4022 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
1ac6466f 4023 percpu_counter_destroy(&sbi->s_extent_cache_cnt);
c5e06d10
JL		 4024 if (sbi->s_mmp_tsk)
4025 kthread_stop(sbi->s_mmp_tsk);
ac27a0ec
DK		 4026failed_mount2:
4027 for (i = 0; i < db_count; i++)
4028 brelse(sbi->s_group_desc[i]);
f18a5f21 4029 ext4_kvfree(sbi->s_group_desc);
ac27a0ec 4030failed_mount:
0441984a
DW		 4031 if (sbi->s_chksum_driver)
4032 crypto_free_shash(sbi->s_chksum_driver);
240799cd 4033 if (sbi->s_proc) {
66acdcf4 4034 remove_proc_entry("options", sbi->s_proc);
9f6200bb 4035 remove_proc_entry(sb->s_id, ext4_proc_root);
240799cd 4036 }
ac27a0ec
DK		 4037#ifdef CONFIG_QUOTA
4038 for (i = 0; i < MAXQUOTAS; i++)
4039 kfree(sbi->s_qf_names[i]);
4040#endif
617ba13b 4041 ext4_blkdev_remove(sbi);
ac27a0ec
DK		 4042 brelse(bh);
4043out_fail:
4044 sb->s_fs_info = NULL;
f6830165 4045 kfree(sbi->s_blockgroup_lock);
ac27a0ec 4046 kfree(sbi);
dcc7dae3 4047out_free_orig:
d4c402d9 4048 kfree(orig_data);
07aa2ea1 4049 return err ? err : ret;
ac27a0ec
DK		 4050}
4051
4052/*
4053 * Setup any per-fs journal parameters now. We'll do this both on
4054 * initial mount, once the journal has been initialised but before we've
4055 * done any recovery; and again on any subsequent remount.
4056 */
617ba13b 4057static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
ac27a0ec 4058{
617ba13b 4059 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4060
30773840
TT		 4061 journal->j_commit_interval = sbi->s_commit_interval;
4062 journal->j_min_batch_time = sbi->s_min_batch_time;
4063 journal->j_max_batch_time = sbi->s_max_batch_time;
ac27a0ec 4064
a931da6a 4065 write_lock(&journal->j_state_lock);
ac27a0ec 4066 if (test_opt(sb, BARRIER))
dab291af 4067 journal->j_flags |= JBD2_BARRIER;
ac27a0ec 4068 else
dab291af 4069 journal->j_flags &= ~JBD2_BARRIER;
5bf5683a
HK		 4070 if (test_opt(sb, DATA_ERR_ABORT))
4071 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
4072 else
4073 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
a931da6a 4074 write_unlock(&journal->j_state_lock);
ac27a0ec
DK		 4075}
4076
617ba13b 4077static journal_t *ext4_get_journal(struct super_block *sb,
ac27a0ec
DK		 4078 unsigned int journal_inum)
4079{
4080 struct inode *journal_inode;
4081 journal_t *journal;
4082
0390131b
FM		 4083 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4084
ac27a0ec
DK		 4085 /* First, test for the existence of a valid inode on disk. Bad
4086 * things happen if we iget() an unused inode, as the subsequent
4087 * iput() will try to delete it. */
4088
1d1fe1ee
DH		 4089 journal_inode = ext4_iget(sb, journal_inum);
4090 if (IS_ERR(journal_inode)) {
b31e1552 4091 ext4_msg(sb, KERN_ERR, "no journal found");
ac27a0ec
DK		 4092 return NULL;
4093 }
4094 if (!journal_inode->i_nlink) {
4095 make_bad_inode(journal_inode);
4096 iput(journal_inode);
b31e1552 4097 ext4_msg(sb, KERN_ERR, "journal inode is deleted");
ac27a0ec
DK		 4098 return NULL;
4099 }
4100
e5f8eab8 4101 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
ac27a0ec 4102 journal_inode, journal_inode->i_size);
1d1fe1ee 4103 if (!S_ISREG(journal_inode->i_mode)) {
b31e1552 4104 ext4_msg(sb, KERN_ERR, "invalid journal inode");
ac27a0ec
DK		 4105 iput(journal_inode);
4106 return NULL;
4107 }
4108
dab291af 4109 journal = jbd2_journal_init_inode(journal_inode);
ac27a0ec 4110 if (!journal) {
b31e1552 4111 ext4_msg(sb, KERN_ERR, "Could not load journal inode");
ac27a0ec
DK		 4112 iput(journal_inode);
4113 return NULL;
4114 }
4115 journal->j_private = sb;
617ba13b 4116 ext4_init_journal_params(sb, journal);
ac27a0ec
DK		 4117 return journal;
4118}
4119
617ba13b 4120static journal_t *ext4_get_dev_journal(struct super_block *sb,
ac27a0ec
DK		 4121 dev_t j_dev)
4122{
2b2d6d01 4123 struct buffer_head *bh;
ac27a0ec 4124 journal_t *journal;
617ba13b
MC		 4125 ext4_fsblk_t start;
4126 ext4_fsblk_t len;
ac27a0ec 4127 int hblock, blocksize;
617ba13b 4128 ext4_fsblk_t sb_block;
ac27a0ec 4129 unsigned long offset;
2b2d6d01 4130 struct ext4_super_block *es;
ac27a0ec
DK		 4131 struct block_device *bdev;
4132
0390131b
FM		 4133 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4134
b31e1552 4135 bdev = ext4_blkdev_get(j_dev, sb);
ac27a0ec
DK		 4136 if (bdev == NULL)
4137 return NULL;
4138
ac27a0ec 4139 blocksize = sb->s_blocksize;
e1defc4f 4140 hblock = bdev_logical_block_size(bdev);
ac27a0ec 4141 if (blocksize < hblock) {
b31e1552
ES		 4142 ext4_msg(sb, KERN_ERR,
4143 "blocksize too small for journal device");
ac27a0ec
DK		 4144 goto out_bdev;
4145 }
4146
617ba13b
MC		 4147 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
4148 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
ac27a0ec
DK		 4149 set_blocksize(bdev, blocksize);
4150 if (!(bh = __bread(bdev, sb_block, blocksize))) {
b31e1552
ES		 4151 ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
4152 "external journal");
ac27a0ec
DK		 4153 goto out_bdev;
4154 }
4155
2716b802 4156 es = (struct ext4_super_block *) (bh->b_data + offset);
617ba13b 4157 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
ac27a0ec 4158 !(le32_to_cpu(es->s_feature_incompat) &
617ba13b 4159 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
b31e1552
ES		 4160 ext4_msg(sb, KERN_ERR, "external journal has "
4161 "bad superblock");
ac27a0ec
DK		 4162 brelse(bh);
4163 goto out_bdev;
4164 }
4165
617ba13b 4166 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
b31e1552 4167 ext4_msg(sb, KERN_ERR, "journal UUID does not match");
ac27a0ec
DK		 4168 brelse(bh);
4169 goto out_bdev;
4170 }
4171
bd81d8ee 4172 len = ext4_blocks_count(es);
ac27a0ec
DK		 4173 start = sb_block + 1;
4174 brelse(bh); /* we're done with the superblock */
4175
dab291af 4176 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
ac27a0ec
DK		 4177 start, len, blocksize);
4178 if (!journal) {
b31e1552 4179 ext4_msg(sb, KERN_ERR, "failed to create device journal");
ac27a0ec
DK		 4180 goto out_bdev;
4181 }
4182 journal->j_private = sb;
4183 ll_rw_block(READ, 1, &journal->j_sb_buffer);
4184 wait_on_buffer(journal->j_sb_buffer);
4185 if (!buffer_uptodate(journal->j_sb_buffer)) {
b31e1552 4186 ext4_msg(sb, KERN_ERR, "I/O error on journal device");
ac27a0ec
DK		 4187 goto out_journal;
4188 }
4189 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
b31e1552
ES		 4190 ext4_msg(sb, KERN_ERR, "External journal has more than one "
4191 "user (unsupported) - %d",
ac27a0ec
DK		 4192 be32_to_cpu(journal->j_superblock->s_nr_users));
4193 goto out_journal;
4194 }
617ba13b
MC		 4195 EXT4_SB(sb)->journal_bdev = bdev;
4196 ext4_init_journal_params(sb, journal);
ac27a0ec 4197 return journal;
0b8e58a1 4198
ac27a0ec 4199out_journal:
dab291af 4200 jbd2_journal_destroy(journal);
ac27a0ec 4201out_bdev:
617ba13b 4202 ext4_blkdev_put(bdev);
ac27a0ec
DK		 4203 return NULL;
4204}
4205
617ba13b
MC		 4206static int ext4_load_journal(struct super_block *sb,
4207 struct ext4_super_block *es,
ac27a0ec
DK		 4208 unsigned long journal_devnum)
4209{
4210 journal_t *journal;
4211 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
4212 dev_t journal_dev;
4213 int err = 0;
4214 int really_read_only;
4215
0390131b
FM		 4216 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4217
ac27a0ec
DK		 4218 if (journal_devnum &&
4219 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
b31e1552
ES		 4220 ext4_msg(sb, KERN_INFO, "external journal device major/minor "
4221 "numbers have changed");
ac27a0ec
DK		 4222 journal_dev = new_decode_dev(journal_devnum);
4223 } else
4224 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
4225
4226 really_read_only = bdev_read_only(sb->s_bdev);
4227
4228 /*
4229 * Are we loading a blank journal or performing recovery after a
4230 * crash? For recovery, we need to check in advance whether we
4231 * can get read-write access to the device.
4232 */
617ba13b 4233 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
ac27a0ec 4234 if (sb->s_flags & MS_RDONLY) {
b31e1552
ES		 4235 ext4_msg(sb, KERN_INFO, "INFO: recovery "
4236 "required on readonly filesystem");
ac27a0ec 4237 if (really_read_only) {
b31e1552
ES		 4238 ext4_msg(sb, KERN_ERR, "write access "
4239 "unavailable, cannot proceed");
ac27a0ec
DK		 4240 return -EROFS;
4241 }
b31e1552
ES		 4242 ext4_msg(sb, KERN_INFO, "write access will "
4243 "be enabled during recovery");
ac27a0ec
DK		 4244 }
4245 }
4246
4247 if (journal_inum && journal_dev) {
b31e1552
ES		 4248 ext4_msg(sb, KERN_ERR, "filesystem has both journal "
4249 "and inode journals!");
ac27a0ec
DK		 4250 return -EINVAL;
4251 }
4252
4253 if (journal_inum) {
617ba13b 4254 if (!(journal = ext4_get_journal(sb, journal_inum)))
ac27a0ec
DK		 4255 return -EINVAL;
4256 } else {
617ba13b 4257 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
ac27a0ec
DK		 4258 return -EINVAL;
4259 }
4260
90576c0b 4261 if (!(journal->j_flags & JBD2_BARRIER))
b31e1552 4262 ext4_msg(sb, KERN_INFO, "barriers disabled");
4776004f 4263
617ba13b 4264 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
dab291af 4265 err = jbd2_journal_wipe(journal, !really_read_only);
1c13d5c0
TT		 4266 if (!err) {
4267 char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL);
4268 if (save)
4269 memcpy(save, ((char *) es) +
4270 EXT4_S_ERR_START, EXT4_S_ERR_LEN);
dab291af 4271 err = jbd2_journal_load(journal);
1c13d5c0
TT		 4272 if (save)
4273 memcpy(((char *) es) + EXT4_S_ERR_START,
4274 save, EXT4_S_ERR_LEN);
4275 kfree(save);
4276 }
ac27a0ec
DK		 4277
4278 if (err) {
b31e1552 4279 ext4_msg(sb, KERN_ERR, "error loading journal");
dab291af 4280 jbd2_journal_destroy(journal);
ac27a0ec
DK		 4281 return err;
4282 }
4283
617ba13b
MC		 4284 EXT4_SB(sb)->s_journal = journal;
4285 ext4_clear_journal_err(sb, es);
ac27a0ec 4286
c41303ce 4287 if (!really_read_only && journal_devnum &&
ac27a0ec
DK		 4288 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
4289 es->s_journal_dev = cpu_to_le32(journal_devnum);
ac27a0ec
DK		 4290
4291 /* Make sure we flush the recovery flag to disk. */
e2d67052 4292 ext4_commit_super(sb, 1);
ac27a0ec
DK		 4293 }
4294
4295 return 0;
4296}
4297
e2d67052 4298static int ext4_commit_super(struct super_block *sb, int sync)
ac27a0ec 4299{
e2d67052 4300 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
617ba13b 4301 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
c4be0c1d 4302 int error = 0;
ac27a0ec 4303
7c2e7087 4304 if (!sbh || block_device_ejected(sb))
c4be0c1d 4305 return error;
914258bf
TT		 4306 if (buffer_write_io_error(sbh)) {
4307 /*
4308 * Oh, dear. A previous attempt to write the
4309 * superblock failed. This could happen because the
4310 * USB device was yanked out. Or it could happen to
4311 * be a transient write error and maybe the block will
4312 * be remapped. Nothing we can do but to retry the
4313 * write and hope for the best.
4314 */
b31e1552
ES		 4315 ext4_msg(sb, KERN_ERR, "previous I/O error to "
4316 "superblock detected");
914258bf
TT		 4317 clear_buffer_write_io_error(sbh);
4318 set_buffer_uptodate(sbh);
4319 }
71290b36
TT		 4320 /*
4321 * If the file system is mounted read-only, don't update the
4322 * superblock write time. This avoids updating the superblock
4323 * write time when we are mounting the root file system
4324 * read/only but we need to replay the journal; at that point,
4325 * for people who are east of GMT and who make their clock
4326 * tick in localtime for Windows bug-for-bug compatibility,
4327 * the clock is set in the future, and this will cause e2fsck
4328 * to complain and force a full file system check.
4329 */
4330 if (!(sb->s_flags & MS_RDONLY))
4331 es->s_wtime = cpu_to_le32(get_seconds());
f613dfcb
TT		 4332 if (sb->s_bdev->bd_part)
4333 es->s_kbytes_written =
4334 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written +
afc32f7e
TT		 4335 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
4336 EXT4_SB(sb)->s_sectors_written_start) >> 1));
f613dfcb
TT		 4337 else
4338 es->s_kbytes_written =
4339 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written);
57042651
TT		 4340 ext4_free_blocks_count_set(es,
4341 EXT4_C2B(EXT4_SB(sb), percpu_counter_sum_positive(
4342 &EXT4_SB(sb)->s_freeclusters_counter)));
ce7e010a
TT		 4343 es->s_free_inodes_count =
4344 cpu_to_le32(percpu_counter_sum_positive(
4345 &EXT4_SB(sb)->s_freeinodes_counter));
ac27a0ec 4346 BUFFER_TRACE(sbh, "marking dirty");
06db49e6 4347 ext4_superblock_csum_set(sb);
ac27a0ec 4348 mark_buffer_dirty(sbh);
914258bf 4349 if (sync) {
c4be0c1d
TS		 4350 error = sync_dirty_buffer(sbh);
4351 if (error)
4352 return error;
4353
4354 error = buffer_write_io_error(sbh);
4355 if (error) {
b31e1552
ES		 4356 ext4_msg(sb, KERN_ERR, "I/O error while writing "
4357 "superblock");
914258bf
TT		 4358 clear_buffer_write_io_error(sbh);
4359 set_buffer_uptodate(sbh);
4360 }
4361 }
c4be0c1d 4362 return error;
ac27a0ec
DK		 4363}
4364
ac27a0ec
DK		 4365/*
4366 * Have we just finished recovery? If so, and if we are mounting (or
4367 * remounting) the filesystem readonly, then we will end up with a
4368 * consistent fs on disk. Record that fact.
4369 */
2b2d6d01
TT		 4370static void ext4_mark_recovery_complete(struct super_block *sb,
4371 struct ext4_super_block *es)
ac27a0ec 4372{
617ba13b 4373 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 4374
0390131b
FM		 4375 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
4376 BUG_ON(journal != NULL);
4377 return;
4378 }
dab291af 4379 jbd2_journal_lock_updates(journal);
7ffe1ea8
HK		 4380 if (jbd2_journal_flush(journal) < 0)
4381 goto out;
4382
617ba13b 4383 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
ac27a0ec 4384 sb->s_flags & MS_RDONLY) {
617ba13b 4385 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
e2d67052 4386 ext4_commit_super(sb, 1);
ac27a0ec 4387 }
7ffe1ea8
HK		 4388
4389out:
dab291af 4390 jbd2_journal_unlock_updates(journal);
ac27a0ec
DK		 4391}
4392
4393/*
4394 * If we are mounting (or read-write remounting) a filesystem whose journal
4395 * has recorded an error from a previous lifetime, move that error to the
4396 * main filesystem now.
4397 */
2b2d6d01
TT		 4398static void ext4_clear_journal_err(struct super_block *sb,
4399 struct ext4_super_block *es)
ac27a0ec
DK		 4400{
4401 journal_t *journal;
4402 int j_errno;
4403 const char *errstr;
4404
0390131b
FM		 4405 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4406
617ba13b 4407 journal = EXT4_SB(sb)->s_journal;
ac27a0ec
DK		 4408
4409 /*
4410 * Now check for any error status which may have been recorded in the
617ba13b 4411 * journal by a prior ext4_error() or ext4_abort()
ac27a0ec
DK		 4412 */
4413
dab291af 4414 j_errno = jbd2_journal_errno(journal);
ac27a0ec
DK		 4415 if (j_errno) {
4416 char nbuf[16];
4417
617ba13b 4418 errstr = ext4_decode_error(sb, j_errno, nbuf);
12062ddd 4419 ext4_warning(sb, "Filesystem error recorded "
ac27a0ec 4420 "from previous mount: %s", errstr);
12062ddd 4421 ext4_warning(sb, "Marking fs in need of filesystem check.");
ac27a0ec 4422
617ba13b
MC		 4423 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
4424 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
e2d67052 4425 ext4_commit_super(sb, 1);
ac27a0ec 4426
dab291af 4427 jbd2_journal_clear_err(journal);
d796c52e 4428 jbd2_journal_update_sb_errno(journal);
ac27a0ec
DK		 4429 }
4430}
4431
4432/*
4433 * Force the running and committing transactions to commit,
4434 * and wait on the commit.
4435 */
617ba13b 4436int ext4_force_commit(struct super_block *sb)
ac27a0ec
DK		 4437{
4438 journal_t *journal;
ac27a0ec
DK		 4439
4440 if (sb->s_flags & MS_RDONLY)
4441 return 0;
4442
617ba13b 4443 journal = EXT4_SB(sb)->s_journal;
b1deefc9 4444 return ext4_journal_force_commit(journal);
ac27a0ec
DK		 4445}
4446
617ba13b 4447static int ext4_sync_fs(struct super_block *sb, int wait)
ac27a0ec 4448{
14ce0cb4 4449 int ret = 0;
9eddacf9 4450 tid_t target;
8d5d02e6 4451 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4452
9bffad1e 4453 trace_ext4_sync_fs(sb, wait);
8d5d02e6 4454 flush_workqueue(sbi->dio_unwritten_wq);
a1177825
JK		 4455 /*
4456 * Writeback quota in non-journalled quota case - journalled quota has
4457 * no dirty dquots
4458 */
4459 dquot_writeback_dquots(sb, -1);
8d5d02e6 4460 if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
9ca92389 4461 if (wait)
8d5d02e6 4462 jbd2_log_wait_commit(sbi->s_journal, target);
0390131b 4463 }
14ce0cb4 4464 return ret;
ac27a0ec
DK		 4465}
4466
4467/*
4468 * LVM calls this function before a (read-only) snapshot is created. This
4469 * gives us a chance to flush the journal completely and mark the fs clean.
be4f27d3
YY		 4470 *
4471 * Note that only this function cannot bring a filesystem to be in a clean
8e8ad8a5
JK		 4472 * state independently. It relies on upper layer to stop all data & metadata
4473 * modifications.
ac27a0ec 4474 */
c4be0c1d 4475static int ext4_freeze(struct super_block *sb)
ac27a0ec 4476{
c4be0c1d
TS		 4477 int error = 0;
4478 journal_t *journal;
ac27a0ec 4479
9ca92389
TT		 4480 if (sb->s_flags & MS_RDONLY)
4481 return 0;
ac27a0ec 4482
9ca92389 4483 journal = EXT4_SB(sb)->s_journal;
7ffe1ea8 4484
9ca92389
TT		 4485 /* Now we set up the journal barrier. */
4486 jbd2_journal_lock_updates(journal);
ac27a0ec 4487
9ca92389
TT		 4488 /*
4489 * Don't clear the needs_recovery flag if we failed to flush
4490 * the journal.
4491 */
4492 error = jbd2_journal_flush(journal);
6b0310fb
ES		 4493 if (error < 0)
4494 goto out;
9ca92389
TT		 4495
4496 /* Journal blocked and flushed, clear needs_recovery flag. */
4497 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4498 error = ext4_commit_super(sb, 1);
6b0310fb 4499out:
8e8ad8a5 4500 /* we rely on upper layer to stop further updates */
6b0310fb
ES		 4501 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
4502 return error;
ac27a0ec
DK		 4503}
4504
4505/*
4506 * Called by LVM after the snapshot is done. We need to reset the RECOVER
4507 * flag here, even though the filesystem is not technically dirty yet.
4508 */
c4be0c1d 4509static int ext4_unfreeze(struct super_block *sb)
ac27a0ec 4510{
9ca92389
TT		 4511 if (sb->s_flags & MS_RDONLY)
4512 return 0;
4513
9ca92389
TT		 4514 /* Reset the needs_recovery flag before the fs is unlocked. */
4515 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4516 ext4_commit_super(sb, 1);
c4be0c1d 4517 return 0;
ac27a0ec
DK		 4518}
4519
673c6100
TT		 4520/*
4521 * Structure to save mount options for ext4_remount's benefit
4522 */
4523struct ext4_mount_options {
4524 unsigned long s_mount_opt;
a2595b8a 4525 unsigned long s_mount_opt2;
08cefc7a
EB		 4526 kuid_t s_resuid;
4527 kgid_t s_resgid;
673c6100
TT		 4528 unsigned long s_commit_interval;
4529 u32 s_min_batch_time, s_max_batch_time;
4530#ifdef CONFIG_QUOTA
4531 int s_jquota_fmt;
4532 char *s_qf_names[MAXQUOTAS];
4533#endif
4534};
4535
2b2d6d01 4536static int ext4_remount(struct super_block *sb, int *flags, char *data)
ac27a0ec 4537{
2b2d6d01 4538 struct ext4_super_block *es;
617ba13b 4539 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4540 unsigned long old_sb_flags;
617ba13b 4541 struct ext4_mount_options old_opts;
c79d967d 4542 int enable_quota = 0;
8a266467 4543 ext4_group_t g;
b3881f74 4544 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
c5e06d10 4545 int err = 0;
ac27a0ec 4546#ifdef CONFIG_QUOTA
03dafb5f 4547 int i, j;
ac27a0ec 4548#endif
d4c402d9 4549 char *orig_data = kstrdup(data, GFP_KERNEL);
ac27a0ec
DK		 4550
4551 /* Store the original options */
4552 old_sb_flags = sb->s_flags;
4553 old_opts.s_mount_opt = sbi->s_mount_opt;
a2595b8a 4554 old_opts.s_mount_opt2 = sbi->s_mount_opt2;
ac27a0ec
DK		 4555 old_opts.s_resuid = sbi->s_resuid;
4556 old_opts.s_resgid = sbi->s_resgid;
4557 old_opts.s_commit_interval = sbi->s_commit_interval;
30773840
TT		 4558 old_opts.s_min_batch_time = sbi->s_min_batch_time;
4559 old_opts.s_max_batch_time = sbi->s_max_batch_time;
ac27a0ec
DK		 4560#ifdef CONFIG_QUOTA
4561 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
4562 for (i = 0; i < MAXQUOTAS; i++)
03dafb5f
CG		 4563 if (sbi->s_qf_names[i]) {
4564 old_opts.s_qf_names[i] = kstrdup(sbi->s_qf_names[i],
4565 GFP_KERNEL);
4566 if (!old_opts.s_qf_names[i]) {
4567 for (j = 0; j < i; j++)
4568 kfree(old_opts.s_qf_names[j]);
3e36a163 4569 kfree(orig_data);
03dafb5f
CG		 4570 return -ENOMEM;
4571 }
4572 } else
4573 old_opts.s_qf_names[i] = NULL;
ac27a0ec 4574#endif
b3881f74
TT		 4575 if (sbi->s_journal && sbi->s_journal->j_task->io_context)
4576 journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
ac27a0ec
DK		 4577
4578 /*
4579 * Allow the "check" option to be passed as a remount option.
4580 */
661aa520 4581 if (!parse_options(data, sb, NULL, &journal_ioprio, 1)) {
ac27a0ec
DK		 4582 err = -EINVAL;
4583 goto restore_opts;
4584 }
4585
4ab2f15b 4586 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
c67d859e 4587 ext4_abort(sb, "Abort forced by user");
ac27a0ec
DK		 4588
4589 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
482a7425 4590 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec
DK		 4591
4592 es = sbi->s_es;
4593
b3881f74 4594 if (sbi->s_journal) {
0390131b 4595 ext4_init_journal_params(sb, sbi->s_journal);
b3881f74
TT		 4596 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
4597 }
ac27a0ec 4598
661aa520 4599 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
4ab2f15b 4600 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) {
ac27a0ec
DK		 4601 err = -EROFS;
4602 goto restore_opts;
4603 }
4604
4605 if (*flags & MS_RDONLY) {
0f0dd62f
CH		 4606 err = dquot_suspend(sb, -1);
4607 if (err < 0)
c79d967d 4608 goto restore_opts;
c79d967d 4609
ac27a0ec
DK		 4610 /*
4611 * First of all, the unconditional stuff we have to do
4612 * to disable replay of the journal when we next remount
4613 */
4614 sb->s_flags |= MS_RDONLY;
4615
4616 /*
4617 * OK, test if we are remounting a valid rw partition
4618 * readonly, and if so set the rdonly flag and then
4619 * mark the partition as valid again.
4620 */
617ba13b
MC		 4621 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
4622 (sbi->s_mount_state & EXT4_VALID_FS))
ac27a0ec
DK		 4623 es->s_state = cpu_to_le16(sbi->s_mount_state);
4624
a63c9eb2 4625 if (sbi->s_journal)
0390131b 4626 ext4_mark_recovery_complete(sb, es);
ac27a0ec 4627 } else {
a13fb1a4
ES		 4628 /* Make sure we can mount this feature set readwrite */
4629 if (!ext4_feature_set_ok(sb, 0)) {
ac27a0ec
DK		 4630 err = -EROFS;
4631 goto restore_opts;
4632 }
8a266467
TT		 4633 /*
4634 * Make sure the group descriptor checksums
0b8e58a1 4635 * are sane. If they aren't, refuse to remount r/w.
8a266467
TT		 4636 */
4637 for (g = 0; g < sbi->s_groups_count; g++) {
4638 struct ext4_group_desc *gdp =
4639 ext4_get_group_desc(sb, g, NULL);
4640
feb0ab32 4641 if (!ext4_group_desc_csum_verify(sb, g, gdp)) {
b31e1552
ES		 4642 ext4_msg(sb, KERN_ERR,
4643 "ext4_remount: Checksum for group %u failed (%u!=%u)",
8a266467
TT		 4644 g, le16_to_cpu(ext4_group_desc_csum(sbi, g, gdp)),
4645 le16_to_cpu(gdp->bg_checksum));
4646 err = -EINVAL;
4647 goto restore_opts;
4648 }
4649 }
4650
ead6596b
ES		 4651 /*
4652 * If we have an unprocessed orphan list hanging
4653 * around from a previously readonly bdev mount,
4654 * require a full umount/remount for now.
4655 */
4656 if (es->s_last_orphan) {
b31e1552 4657 ext4_msg(sb, KERN_WARNING, "Couldn't "
ead6596b
ES		 4658 "remount RDWR because of unprocessed "
4659 "orphan inode list. Please "
b31e1552 4660 "umount/remount instead");
ead6596b
ES		 4661 err = -EINVAL;
4662 goto restore_opts;
4663 }
4664
ac27a0ec
DK		 4665 /*
4666 * Mounting a RDONLY partition read-write, so reread
4667 * and store the current valid flag. (It may have
4668 * been changed by e2fsck since we originally mounted
4669 * the partition.)
4670 */
0390131b
FM		 4671 if (sbi->s_journal)
4672 ext4_clear_journal_err(sb, es);
ac27a0ec 4673 sbi->s_mount_state = le16_to_cpu(es->s_state);
2b2d6d01 4674 if (!ext4_setup_super(sb, es, 0))
ac27a0ec 4675 sb->s_flags &= ~MS_RDONLY;
c5e06d10
JL		 4676 if (EXT4_HAS_INCOMPAT_FEATURE(sb,
4677 EXT4_FEATURE_INCOMPAT_MMP))
4678 if (ext4_multi_mount_protect(sb,
4679 le64_to_cpu(es->s_mmp_block))) {
4680 err = -EROFS;
4681 goto restore_opts;
4682 }
c79d967d 4683 enable_quota = 1;
ac27a0ec
DK		 4684 }
4685 }
bfff6873
LC		 4686
4687 /*
4688 * Reinitialize lazy itable initialization thread based on
4689 * current settings
4690 */
4691 if ((sb->s_flags & MS_RDONLY) || !test_opt(sb, INIT_INODE_TABLE))
4692 ext4_unregister_li_request(sb);
4693 else {
4694 ext4_group_t first_not_zeroed;
4695 first_not_zeroed = ext4_has_uninit_itable(sb);
4696 ext4_register_li_request(sb, first_not_zeroed);
4697 }
4698
6fd058f7 4699 ext4_setup_system_zone(sb);
d096ad0f 4700 if (sbi->s_journal == NULL && !(old_sb_flags & MS_RDONLY))
e2d67052 4701 ext4_commit_super(sb, 1);
0390131b 4702
ac27a0ec
DK		 4703#ifdef CONFIG_QUOTA
4704 /* Release old quota file names */
4705 for (i = 0; i < MAXQUOTAS; i++)
03dafb5f 4706 kfree(old_opts.s_qf_names[i]);
7c319d32
AK		 4707 if (enable_quota) {
4708 if (sb_any_quota_suspended(sb))
4709 dquot_resume(sb, -1);
4710 else if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
4711 EXT4_FEATURE_RO_COMPAT_QUOTA)) {
4712 err = ext4_enable_quotas(sb);
07724f98 4713 if (err)
7c319d32 4714 goto restore_opts;
7c319d32
AK		 4715 }
4716 }
ac27a0ec 4717#endif
d4c402d9
CW		 4718
4719 ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s", orig_data);
4720 kfree(orig_data);
ac27a0ec 4721 return 0;
0b8e58a1 4722
ac27a0ec
DK		 4723restore_opts:
4724 sb->s_flags = old_sb_flags;
4725 sbi->s_mount_opt = old_opts.s_mount_opt;
a2595b8a 4726 sbi->s_mount_opt2 = old_opts.s_mount_opt2;
ac27a0ec
DK		 4727 sbi->s_resuid = old_opts.s_resuid;
4728 sbi->s_resgid = old_opts.s_resgid;
4729 sbi->s_commit_interval = old_opts.s_commit_interval;
30773840
TT		 4730 sbi->s_min_batch_time = old_opts.s_min_batch_time;
4731 sbi->s_max_batch_time = old_opts.s_max_batch_time;
ac27a0ec
DK		 4732#ifdef CONFIG_QUOTA
4733 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
4734 for (i = 0; i < MAXQUOTAS; i++) {
03dafb5f 4735 kfree(sbi->s_qf_names[i]);
ac27a0ec
DK		 4736 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
4737 }
4738#endif
d4c402d9 4739 kfree(orig_data);
ac27a0ec
DK		 4740 return err;
4741}
4742
2b2d6d01 4743static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
ac27a0ec
DK		 4744{
4745 struct super_block *sb = dentry->d_sb;
617ba13b
MC		 4746 struct ext4_sb_info *sbi = EXT4_SB(sb);
4747 struct ext4_super_block *es = sbi->s_es;
952fc18e 4748 ext4_fsblk_t overhead = 0;
960cc398 4749 u64 fsid;
d02a9391 4750 s64 bfree;
ac27a0ec 4751
952fc18e
TT		 4752 if (!test_opt(sb, MINIX_DF))
4753 overhead = sbi->s_overhead;
ac27a0ec 4754
617ba13b 4755 buf->f_type = EXT4_SUPER_MAGIC;
ac27a0ec 4756 buf->f_bsize = sb->s_blocksize;
b72f78cb 4757 buf->f_blocks = ext4_blocks_count(es) - EXT4_C2B(sbi, overhead);
57042651
TT		 4758 bfree = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) -
4759 percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter);
d02a9391 4760 /* prevent underflow in case that few free space is available */
57042651 4761 buf->f_bfree = EXT4_C2B(sbi, max_t(s64, bfree, 0));
bd81d8ee
LV		 4762 buf->f_bavail = buf->f_bfree - ext4_r_blocks_count(es);
4763 if (buf->f_bfree < ext4_r_blocks_count(es))
ac27a0ec
DK		 4764 buf->f_bavail = 0;
4765 buf->f_files = le32_to_cpu(es->s_inodes_count);
52d9f3b4 4766 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
617ba13b 4767 buf->f_namelen = EXT4_NAME_LEN;
960cc398
PE		 4768 fsid = le64_to_cpup((void *)es->s_uuid) ^
4769 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
4770 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
4771 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
0b8e58a1 4772
ac27a0ec
DK		 4773 return 0;
4774}
4775
0b8e58a1
AD		 4776/* Helper function for writing quotas on sync - we need to start transaction
4777 * before quota file is locked for write. Otherwise the are possible deadlocks:
ac27a0ec 4778 * Process 1 Process 2
617ba13b 4779 * ext4_create() quota_sync()
a269eb18 4780 * jbd2_journal_start() write_dquot()
871a2931 4781 * dquot_initialize() down(dqio_mutex)
dab291af 4782 * down(dqio_mutex) jbd2_journal_start()
ac27a0ec
DK		 4783 *
4784 */
4785
4786#ifdef CONFIG_QUOTA
4787
4788static inline struct inode *dquot_to_inode(struct dquot *dquot)
4789{
4c376dca 4790 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_id.type];
ac27a0ec
DK		 4791}
4792
617ba13b 4793static int ext4_write_dquot(struct dquot *dquot)
ac27a0ec
DK		 4794{
4795 int ret, err;
4796 handle_t *handle;
4797 struct inode *inode;
4798
4799 inode = dquot_to_inode(dquot);
9924a92a 4800 handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
0b8e58a1 4801 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 4802 if (IS_ERR(handle))
4803 return PTR_ERR(handle);
4804 ret = dquot_commit(dquot);
617ba13b 4805 err = ext4_journal_stop(handle);
ac27a0ec
DK		 4806 if (!ret)
4807 ret = err;
4808 return ret;
4809}
4810
617ba13b 4811static int ext4_acquire_dquot(struct dquot *dquot)
ac27a0ec
DK		 4812{
4813 int ret, err;
4814 handle_t *handle;
4815
9924a92a 4816 handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
0b8e58a1 4817 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 4818 if (IS_ERR(handle))
4819 return PTR_ERR(handle);
4820 ret = dquot_acquire(dquot);
617ba13b 4821 err = ext4_journal_stop(handle);
ac27a0ec
DK		 4822 if (!ret)
4823 ret = err;
4824 return ret;
4825}
4826
617ba13b 4827static int ext4_release_dquot(struct dquot *dquot)
ac27a0ec
DK		 4828{
4829 int ret, err;
4830 handle_t *handle;
4831
9924a92a 4832 handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
0b8e58a1 4833 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
9c3013e9
JK		 4834 if (IS_ERR(handle)) {
4835 /* Release dquot anyway to avoid endless cycle in dqput() */
4836 dquot_release(dquot);
ac27a0ec 4837 return PTR_ERR(handle);
9c3013e9 4838 }
ac27a0ec 4839 ret = dquot_release(dquot);
617ba13b 4840 err = ext4_journal_stop(handle);
ac27a0ec
DK		 4841 if (!ret)
4842 ret = err;
4843 return ret;
4844}
4845
617ba13b 4846static int ext4_mark_dquot_dirty(struct dquot *dquot)
ac27a0ec 4847{
262b4662
JK		 4848 struct super_block *sb = dquot->dq_sb;
4849 struct ext4_sb_info *sbi = EXT4_SB(sb);
4850
2c8be6b2 4851 /* Are we journaling quotas? */
262b4662
JK		 4852 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) ||
4853 sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
ac27a0ec 4854 dquot_mark_dquot_dirty(dquot);
617ba13b 4855 return ext4_write_dquot(dquot);
ac27a0ec
DK		 4856 } else {
4857 return dquot_mark_dquot_dirty(dquot);
4858 }
4859}
4860
617ba13b 4861static int ext4_write_info(struct super_block *sb, int type)
ac27a0ec
DK		 4862{
4863 int ret, err;
4864 handle_t *handle;
4865
4866 /* Data block + inode block */
9924a92a 4867 handle = ext4_journal_start(sb->s_root->d_inode, EXT4_HT_QUOTA, 2);
ac27a0ec
DK		 4868 if (IS_ERR(handle))
4869 return PTR_ERR(handle);
4870 ret = dquot_commit_info(sb, type);
617ba13b 4871 err = ext4_journal_stop(handle);
ac27a0ec
DK		 4872 if (!ret)
4873 ret = err;
4874 return ret;
4875}
4876
4877/*
4878 * Turn on quotas during mount time - we need to find
4879 * the quota file and such...
4880 */
617ba13b 4881static int ext4_quota_on_mount(struct super_block *sb, int type)
ac27a0ec 4882{
287a8095
CH		 4883 return dquot_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
4884 EXT4_SB(sb)->s_jquota_fmt, type);
ac27a0ec
DK		 4885}
4886
4887/*
4888 * Standard function to be called on quota_on
4889 */
617ba13b 4890static int ext4_quota_on(struct super_block *sb, int type, int format_id,
f00c9e44 4891 struct path *path)
ac27a0ec
DK		 4892{
4893 int err;
ac27a0ec
DK		 4894
4895 if (!test_opt(sb, QUOTA))
4896 return -EINVAL;
0623543b 4897
ac27a0ec 4898 /* Quotafile not on the same filesystem? */
d8c9584e 4899 if (path->dentry->d_sb != sb)
ac27a0ec 4900 return -EXDEV;
0623543b
JK		 4901 /* Journaling quota? */
4902 if (EXT4_SB(sb)->s_qf_names[type]) {
2b2d6d01 4903 /* Quotafile not in fs root? */
f00c9e44 4904 if (path->dentry->d_parent != sb->s_root)
b31e1552
ES		 4905 ext4_msg(sb, KERN_WARNING,
4906 "Quota file not on filesystem root. "
4907 "Journaled quota will not work");
2b2d6d01 4908 }
0623543b
JK		 4909
4910 /*
4911 * When we journal data on quota file, we have to flush journal to see
4912 * all updates to the file when we bypass pagecache...
4913 */
0390131b 4914 if (EXT4_SB(sb)->s_journal &&
f00c9e44 4915 ext4_should_journal_data(path->dentry->d_inode)) {
0623543b
JK		 4916 /*
4917 * We don't need to lock updates but journal_flush() could
4918 * otherwise be livelocked...
4919 */
4920 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
7ffe1ea8 4921 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
0623543b 4922 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
f00c9e44 4923 if (err)
7ffe1ea8 4924 return err;
0623543b
JK		 4925 }
4926
f00c9e44 4927 return dquot_quota_on(sb, type, format_id, path);
ac27a0ec
DK		 4928}
4929
7c319d32
AK		 4930static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
4931 unsigned int flags)
4932{
4933 int err;
4934 struct inode *qf_inode;
4935 unsigned long qf_inums[MAXQUOTAS] = {
4936 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
4937 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum)
4938 };
4939
4940 BUG_ON(!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA));
4941
4942 if (!qf_inums[type])
4943 return -EPERM;
4944
4945 qf_inode = ext4_iget(sb, qf_inums[type]);
4946 if (IS_ERR(qf_inode)) {
4947 ext4_error(sb, "Bad quota inode # %lu", qf_inums[type]);
4948 return PTR_ERR(qf_inode);
4949 }
4950
4951 err = dquot_enable(qf_inode, type, format_id, flags);
4952 iput(qf_inode);
4953
4954 return err;
4955}
4956
4957/* Enable usage tracking for all quota types. */
4958static int ext4_enable_quotas(struct super_block *sb)
4959{
4960 int type, err = 0;
4961 unsigned long qf_inums[MAXQUOTAS] = {
4962 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
4963 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum)
4964 };
4965
4966 sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE;
4967 for (type = 0; type < MAXQUOTAS; type++) {
4968 if (qf_inums[type]) {
4969 err = ext4_quota_enable(sb, type, QFMT_VFS_V1,
4970 DQUOT_USAGE_ENABLED);
4971 if (err) {
4972 ext4_warning(sb,
72ba7450
TT		 4973 "Failed to enable quota tracking "
4974 "(type=%d, err=%d). Please run "
4975 "e2fsck to fix.", type, err);
7c319d32
AK		 4976 return err;
4977 }
4978 }
4979 }
4980 return 0;
4981}
4982
4983/*
4984 * quota_on function that is used when QUOTA feature is set.
4985 */
4986static int ext4_quota_on_sysfile(struct super_block *sb, int type,
4987 int format_id)
4988{
4989 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA))
4990 return -EINVAL;
4991
4992 /*
4993 * USAGE was enabled at mount time. Only need to enable LIMITS now.
4994 */
4995 return ext4_quota_enable(sb, type, format_id, DQUOT_LIMITS_ENABLED);
4996}
4997
ca0e05e4
DM		 4998static int ext4_quota_off(struct super_block *sb, int type)
4999{
21f97697
JK		 5000 struct inode *inode = sb_dqopt(sb)->files[type];
5001 handle_t *handle;
5002
87009d86
DM		 5003 /* Force all delayed allocation blocks to be allocated.
5004 * Caller already holds s_umount sem */
5005 if (test_opt(sb, DELALLOC))
ca0e05e4 5006 sync_filesystem(sb);
ca0e05e4 5007
0b268590
AG		 5008 if (!inode)
5009 goto out;
5010
21f97697
JK		 5011 /* Update modification times of quota files when userspace can
5012 * start looking at them */
9924a92a 5013 handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1);
21f97697
JK		 5014 if (IS_ERR(handle))
5015 goto out;
5016 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
5017 ext4_mark_inode_dirty(handle, inode);
5018 ext4_journal_stop(handle);
5019
5020out:
ca0e05e4
DM		 5021 return dquot_quota_off(sb, type);
5022}
5023
7c319d32
AK		 5024/*
5025 * quota_off function that is used when QUOTA feature is set.
5026 */
5027static int ext4_quota_off_sysfile(struct super_block *sb, int type)
5028{
5029 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA))
5030 return -EINVAL;
5031
5032 /* Disable only the limits. */
5033 return dquot_disable(sb, type, DQUOT_LIMITS_ENABLED);
5034}
5035
ac27a0ec
DK		 5036/* Read data from quotafile - avoid pagecache and such because we cannot afford
5037 * acquiring the locks... As quota files are never truncated and quota code
25985edc 5038 * itself serializes the operations (and no one else should touch the files)
ac27a0ec 5039 * we don't have to be afraid of races */
617ba13b 5040static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec
DK		 5041 size_t len, loff_t off)
5042{
5043 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 5044 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 5045 int err = 0;
5046 int offset = off & (sb->s_blocksize - 1);
5047 int tocopy;
5048 size_t toread;
5049 struct buffer_head *bh;
5050 loff_t i_size = i_size_read(inode);
5051
5052 if (off > i_size)
5053 return 0;
5054 if (off+len > i_size)
5055 len = i_size-off;
5056 toread = len;
5057 while (toread > 0) {
5058 tocopy = sb->s_blocksize - offset < toread ?
5059 sb->s_blocksize - offset : toread;
617ba13b 5060 bh = ext4_bread(NULL, inode, blk, 0, &err);
ac27a0ec
DK		 5061 if (err)
5062 return err;
5063 if (!bh) /* A hole? */
5064 memset(data, 0, tocopy);
5065 else
5066 memcpy(data, bh->b_data+offset, tocopy);
5067 brelse(bh);
5068 offset = 0;
5069 toread -= tocopy;
5070 data += tocopy;
5071 blk++;
5072 }
5073 return len;
5074}
5075
5076/* Write to quotafile (we know the transaction is already started and has
5077 * enough credits) */
617ba13b 5078static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec
DK		 5079 const char *data, size_t len, loff_t off)
5080{
5081 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 5082 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 5083 int err = 0;
5084 int offset = off & (sb->s_blocksize - 1);
ac27a0ec
DK		 5085 struct buffer_head *bh;
5086 handle_t *handle = journal_current_handle();
5087
0390131b 5088 if (EXT4_SB(sb)->s_journal && !handle) {
b31e1552
ES		 5089 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
5090 " cancelled because transaction is not started",
9c3013e9
JK		 5091 (unsigned long long)off, (unsigned long long)len);
5092 return -EIO;
5093 }
67eeb568
DM		 5094 /*
5095 * Since we account only one data block in transaction credits,
5096 * then it is impossible to cross a block boundary.
5097 */
5098 if (sb->s_blocksize - offset < len) {
5099 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
5100 " cancelled because not block aligned",
5101 (unsigned long long)off, (unsigned long long)len);
5102 return -EIO;
5103 }
5104
67eeb568
DM		 5105 bh = ext4_bread(handle, inode, blk, 1, &err);
5106 if (!bh)
5107 goto out;
62d2b5f2
JK		 5108 err = ext4_journal_get_write_access(handle, bh);
5109 if (err) {
5110 brelse(bh);
5111 goto out;
ac27a0ec 5112 }
67eeb568
DM		 5113 lock_buffer(bh);
5114 memcpy(bh->b_data+offset, data, len);
5115 flush_dcache_page(bh->b_page);
5116 unlock_buffer(bh);
62d2b5f2 5117 err = ext4_handle_dirty_metadata(handle, NULL, bh);
67eeb568 5118 brelse(bh);
ac27a0ec 5119out:
0b7f7cef 5120 if (err)
ac27a0ec 5121 return err;
67eeb568
DM		 5122 if (inode->i_size < off + len) {
5123 i_size_write(inode, off + len);
617ba13b 5124 EXT4_I(inode)->i_disksize = inode->i_size;
21f97697 5125 ext4_mark_inode_dirty(handle, inode);
ac27a0ec 5126 }
67eeb568 5127 return len;
ac27a0ec
DK		 5128}
5129
5130#endif
5131
152a0836
AV		 5132static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
5133 const char *dev_name, void *data)
ac27a0ec 5134{
152a0836 5135 return mount_bdev(fs_type, flags, dev_name, data, ext4_fill_super);
ac27a0ec
DK		 5136}
5137
37f328eb 5138#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
24b58424
TT		 5139static inline void register_as_ext2(void)
5140{
5141 int err = register_filesystem(&ext2_fs_type);
5142 if (err)
5143 printk(KERN_WARNING
5144 "EXT4-fs: Unable to register as ext2 (%d)\n", err);
5145}
5146
5147static inline void unregister_as_ext2(void)
5148{
5149 unregister_filesystem(&ext2_fs_type);
5150}
2035e776
TT		 5151
5152static inline int ext2_feature_set_ok(struct super_block *sb)
5153{
5154 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP))
5155 return 0;
5156 if (sb->s_flags & MS_RDONLY)
5157 return 1;
5158 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))
5159 return 0;
5160 return 1;
5161}
24b58424
TT		 5162#else
5163static inline void register_as_ext2(void) { }
5164static inline void unregister_as_ext2(void) { }
2035e776 5165static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; }
24b58424
TT		 5166#endif
5167
37f328eb 5168#if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
24b58424
TT		 5169static inline void register_as_ext3(void)
5170{
5171 int err = register_filesystem(&ext3_fs_type);
5172 if (err)
5173 printk(KERN_WARNING
5174 "EXT4-fs: Unable to register as ext3 (%d)\n", err);
5175}
5176
5177static inline void unregister_as_ext3(void)
5178{
5179 unregister_filesystem(&ext3_fs_type);
5180}
2035e776
TT		 5181
5182static inline int ext3_feature_set_ok(struct super_block *sb)
5183{
5184 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP))
5185 return 0;
5186 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
5187 return 0;
5188 if (sb->s_flags & MS_RDONLY)
5189 return 1;
5190 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP))
5191 return 0;
5192 return 1;
5193}
24b58424
TT		 5194#else
5195static inline void register_as_ext3(void) { }
5196static inline void unregister_as_ext3(void) { }
2035e776 5197static inline int ext3_feature_set_ok(struct super_block *sb) { return 0; }
24b58424
TT		 5198#endif
5199
03010a33
TT		 5200static struct file_system_type ext4_fs_type = {
5201 .owner = THIS_MODULE,
5202 .name = "ext4",
152a0836 5203 .mount = ext4_mount,
03010a33
TT		 5204 .kill_sb = kill_block_super,
5205 .fs_flags = FS_REQUIRES_DEV,
5206};
7f78e035 5207MODULE_ALIAS_FS("ext4");
03010a33 5208
8f021222 5209static int __init ext4_init_feat_adverts(void)
857ac889
LC		 5210{
5211 struct ext4_features *ef;
5212 int ret = -ENOMEM;
5213
5214 ef = kzalloc(sizeof(struct ext4_features), GFP_KERNEL);
5215 if (!ef)
5216 goto out;
5217
5218 ef->f_kobj.kset = ext4_kset;
5219 init_completion(&ef->f_kobj_unregister);
5220 ret = kobject_init_and_add(&ef->f_kobj, &ext4_feat_ktype, NULL,
5221 "features");
5222 if (ret) {
5223 kfree(ef);
5224 goto out;
5225 }
5226
5227 ext4_feat = ef;
5228 ret = 0;
5229out:
5230 return ret;
5231}
5232
8f021222
LC		 5233static void ext4_exit_feat_adverts(void)
5234{
5235 kobject_put(&ext4_feat->f_kobj);
5236 wait_for_completion(&ext4_feat->f_kobj_unregister);
5237 kfree(ext4_feat);
5238}
5239
e9e3bcec
ES		 5240/* Shared across all ext4 file systems */
5241wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
5242struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ];
5243
5dabfc78 5244static int __init ext4_init_fs(void)
ac27a0ec 5245{
e9e3bcec 5246 int i, err;
c9de560d 5247
07c0c5d8
AV		 5248 ext4_li_info = NULL;
5249 mutex_init(&ext4_li_mtx);
5250
9a4c8019 5251 /* Build-time check for flags consistency */
12e9b892 5252 ext4_check_flag_values();
e9e3bcec
ES		 5253
5254 for (i = 0; i < EXT4_WQ_HASH_SZ; i++) {
5255 mutex_init(&ext4__aio_mutex[i]);
5256 init_waitqueue_head(&ext4__ioend_wq[i]);
5257 }
5258
51865fda 5259 err = ext4_init_es();
6fd058f7
TT		 5260 if (err)
5261 return err;
51865fda
ZL		 5262
5263 err = ext4_init_pageio();
5264 if (err)
5265 goto out7;
5266
5dabfc78 5267 err = ext4_init_system_zone();
bd2d0210 5268 if (err)
d44651d0 5269 goto out6;
3197ebdb 5270 ext4_kset = kset_create_and_add("ext4", NULL, fs_kobj);
0e376b1e
TT		 5271 if (!ext4_kset) {
5272 err = -ENOMEM;
dd68314c 5273 goto out5;
0e376b1e 5274 }
d44651d0 5275 ext4_proc_root = proc_mkdir("fs/ext4", NULL);
857ac889
LC		 5276
5277 err = ext4_init_feat_adverts();
dd68314c
TT		 5278 if (err)
5279 goto out4;
857ac889 5280
5dabfc78 5281 err = ext4_init_mballoc();
ac27a0ec 5282 if (err)
6fd058f7 5283 goto out3;
c9de560d 5284
5dabfc78 5285 err = ext4_init_xattr();
c9de560d
AT		 5286 if (err)
5287 goto out2;
ac27a0ec
DK		 5288 err = init_inodecache();
5289 if (err)
5290 goto out1;
24b58424 5291 register_as_ext3();
2035e776 5292 register_as_ext2();
03010a33 5293 err = register_filesystem(&ext4_fs_type);
ac27a0ec
DK		 5294 if (err)
5295 goto out;
bfff6873 5296
ac27a0ec
DK		 5297 return 0;
5298out:
24b58424
TT		 5299 unregister_as_ext2();
5300 unregister_as_ext3();
ac27a0ec
DK		 5301 destroy_inodecache();
5302out1:
5dabfc78 5303 ext4_exit_xattr();
c9de560d 5304out2:
5dabfc78 5305 ext4_exit_mballoc();
6fd058f7 5306out3:
8f021222 5307 ext4_exit_feat_adverts();
dd68314c 5308out4:
d44651d0
FJ		 5309 if (ext4_proc_root)
5310 remove_proc_entry("fs/ext4", NULL);
6fd058f7 5311 kset_unregister(ext4_kset);
d44651d0 5312out5:
5dabfc78 5313 ext4_exit_system_zone();
d44651d0 5314out6:
5dabfc78 5315 ext4_exit_pageio();
51865fda
ZL		 5316out7:
5317 ext4_exit_es();
5318
ac27a0ec
DK		 5319 return err;
5320}
5321
5dabfc78 5322static void __exit ext4_exit_fs(void)
ac27a0ec 5323{
bfff6873 5324 ext4_destroy_lazyinit_thread();
24b58424
TT		 5325 unregister_as_ext2();
5326 unregister_as_ext3();
03010a33 5327 unregister_filesystem(&ext4_fs_type);
ac27a0ec 5328 destroy_inodecache();
5dabfc78
TT		 5329 ext4_exit_xattr();
5330 ext4_exit_mballoc();
8f021222 5331 ext4_exit_feat_adverts();
9f6200bb 5332 remove_proc_entry("fs/ext4", NULL);
3197ebdb 5333 kset_unregister(ext4_kset);
5dabfc78
TT		 5334 ext4_exit_system_zone();
5335 ext4_exit_pageio();
ac27a0ec
DK		 5336}
5337
5338MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
83982b6f 5339MODULE_DESCRIPTION("Fourth Extended Filesystem");
ac27a0ec 5340MODULE_LICENSE("GPL");
5dabfc78
TT		 5341module_init(ext4_init_fs)
5342module_exit(ext4_exit_fs)
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