]> git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blame - fs/ext4/super.c
projects / mirror_ubuntu-artful-kernel.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
Revert "ext4: fix suboptimal seek_{data,hole} extents traversial"
[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;
9c191f70 62static int ext4_mballoc_ready;
9f6200bb 63
617ba13b 64static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
ac27a0ec 65 unsigned long journal_devnum);
2adf6da8 66static int ext4_show_options(struct seq_file *seq, struct dentry *root);
e2d67052 67static int ext4_commit_super(struct super_block *sb, int sync);
2b2d6d01
TT		 68static void ext4_mark_recovery_complete(struct super_block *sb,
69 struct ext4_super_block *es);
70static void ext4_clear_journal_err(struct super_block *sb,
71 struct ext4_super_block *es);
617ba13b 72static int ext4_sync_fs(struct super_block *sb, int wait);
2b2d6d01
TT		 73static int ext4_remount(struct super_block *sb, int *flags, char *data);
74static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
c4be0c1d 75static int ext4_unfreeze(struct super_block *sb);
c4be0c1d 76static int ext4_freeze(struct super_block *sb);
152a0836
AV		 77static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
78 const char *dev_name, void *data);
2035e776
TT		 79static inline int ext2_feature_set_ok(struct super_block *sb);
80static inline int ext3_feature_set_ok(struct super_block *sb);
d39195c3 81static int ext4_feature_set_ok(struct super_block *sb, int readonly);
bfff6873
LC		 82static void ext4_destroy_lazyinit_thread(void);
83static void ext4_unregister_li_request(struct super_block *sb);
8f1f7453 84static void ext4_clear_request_list(void);
27dd4385 85static int ext4_reserve_clusters(struct ext4_sb_info *, ext4_fsblk_t);
ac27a0ec 86
2035e776
TT		 87#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
88static struct file_system_type ext2_fs_type = {
89 .owner = THIS_MODULE,
90 .name = "ext2",
91 .mount = ext4_mount,
92 .kill_sb = kill_block_super,
93 .fs_flags = FS_REQUIRES_DEV,
94};
7f78e035 95MODULE_ALIAS_FS("ext2");
fa7614dd 96MODULE_ALIAS("ext2");
2035e776
TT		 97#define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type)
98#else
99#define IS_EXT2_SB(sb) (0)
100#endif
101
102
ba69f9ab
JK		 103#if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
104static struct file_system_type ext3_fs_type = {
105 .owner = THIS_MODULE,
106 .name = "ext3",
152a0836 107 .mount = ext4_mount,
ba69f9ab
JK		 108 .kill_sb = kill_block_super,
109 .fs_flags = FS_REQUIRES_DEV,
110};
7f78e035 111MODULE_ALIAS_FS("ext3");
fa7614dd 112MODULE_ALIAS("ext3");
ba69f9ab
JK		 113#define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type)
114#else
115#define IS_EXT3_SB(sb) (0)
116#endif
bd81d8ee 117
d25425f8
DW		 118static int ext4_verify_csum_type(struct super_block *sb,
119 struct ext4_super_block *es)
120{
121 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
122 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
123 return 1;
124
125 return es->s_checksum_type == EXT4_CRC32C_CHKSUM;
126}
127
a9c47317
DW		 128static __le32 ext4_superblock_csum(struct super_block *sb,
129 struct ext4_super_block *es)
130{
131 struct ext4_sb_info *sbi = EXT4_SB(sb);
132 int offset = offsetof(struct ext4_super_block, s_checksum);
133 __u32 csum;
134
135 csum = ext4_chksum(sbi, ~0, (char *)es, offset);
136
137 return cpu_to_le32(csum);
138}
139
c197855e
SH		 140static int ext4_superblock_csum_verify(struct super_block *sb,
141 struct ext4_super_block *es)
a9c47317 142{
9aa5d32b 143 if (!ext4_has_metadata_csum(sb))
a9c47317
DW		 144 return 1;
145
146 return es->s_checksum == ext4_superblock_csum(sb, es);
147}
148
06db49e6 149void ext4_superblock_csum_set(struct super_block *sb)
a9c47317 150{
06db49e6
TT		 151 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
152
9aa5d32b 153 if (!ext4_has_metadata_csum(sb))
a9c47317
DW		 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
8be04b93 163 ret = kmalloc(size, flags | __GFP_NOWARN);
9933fc0a
TT		 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
8be04b93 173 ret = kzalloc(size, flags | __GFP_NOWARN);
9933fc0a
TT		 174 if (!ret)
175 ret = __vmalloc(size, flags | __GFP_ZERO, PAGE_KERNEL);
176 return ret;
177}
178
8fadc143
AR		 179ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
180 struct ext4_group_desc *bg)
bd81d8ee 181{
3a14589c 182 return le32_to_cpu(bg->bg_block_bitmap_lo) |
8fadc143 183 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 184 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 185}
186
8fadc143
AR		 187ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
188 struct ext4_group_desc *bg)
bd81d8ee 189{
5272f837 190 return le32_to_cpu(bg->bg_inode_bitmap_lo) |
8fadc143 191 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 192 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 193}
194
8fadc143
AR		 195ext4_fsblk_t ext4_inode_table(struct super_block *sb,
196 struct ext4_group_desc *bg)
bd81d8ee 197{
5272f837 198 return le32_to_cpu(bg->bg_inode_table_lo) |
8fadc143 199 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 200 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
bd81d8ee
LV		 201}
202
021b65bb
TT		 203__u32 ext4_free_group_clusters(struct super_block *sb,
204 struct ext4_group_desc *bg)
560671a0
AK		 205{
206 return le16_to_cpu(bg->bg_free_blocks_count_lo) |
207 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 208 (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0);
560671a0
AK		 209}
210
211__u32 ext4_free_inodes_count(struct super_block *sb,
212 struct ext4_group_desc *bg)
213{
214 return le16_to_cpu(bg->bg_free_inodes_count_lo) |
215 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 216 (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0);
560671a0
AK		 217}
218
219__u32 ext4_used_dirs_count(struct super_block *sb,
220 struct ext4_group_desc *bg)
221{
222 return le16_to_cpu(bg->bg_used_dirs_count_lo) |
223 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 224 (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0);
560671a0
AK		 225}
226
227__u32 ext4_itable_unused_count(struct super_block *sb,
228 struct ext4_group_desc *bg)
229{
230 return le16_to_cpu(bg->bg_itable_unused_lo) |
231 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 232 (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0);
560671a0
AK		 233}
234
8fadc143
AR		 235void ext4_block_bitmap_set(struct super_block *sb,
236 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 237{
3a14589c 238 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 239 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
240 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 241}
242
8fadc143
AR		 243void ext4_inode_bitmap_set(struct super_block *sb,
244 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 245{
5272f837 246 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 247 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
248 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 249}
250
8fadc143
AR		 251void ext4_inode_table_set(struct super_block *sb,
252 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 253{
5272f837 254 bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 255 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
256 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 257}
258
021b65bb
TT		 259void ext4_free_group_clusters_set(struct super_block *sb,
260 struct ext4_group_desc *bg, __u32 count)
560671a0
AK		 261{
262 bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count);
263 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
264 bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16);
265}
266
267void ext4_free_inodes_set(struct super_block *sb,
268 struct ext4_group_desc *bg, __u32 count)
269{
270 bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count);
271 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
272 bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16);
273}
274
275void ext4_used_dirs_set(struct super_block *sb,
276 struct ext4_group_desc *bg, __u32 count)
277{
278 bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count);
279 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
280 bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16);
281}
282
283void ext4_itable_unused_set(struct super_block *sb,
284 struct ext4_group_desc *bg, __u32 count)
285{
286 bg->bg_itable_unused_lo = cpu_to_le16((__u16)count);
287 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
288 bg->bg_itable_unused_hi = cpu_to_le16(count >> 16);
289}
290
d3d1faf6 291
1c13d5c0
TT		 292static void __save_error_info(struct super_block *sb, const char *func,
293 unsigned int line)
294{
295 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
296
297 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
298 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
299 es->s_last_error_time = cpu_to_le32(get_seconds());
300 strncpy(es->s_last_error_func, func, sizeof(es->s_last_error_func));
301 es->s_last_error_line = cpu_to_le32(line);
302 if (!es->s_first_error_time) {
303 es->s_first_error_time = es->s_last_error_time;
304 strncpy(es->s_first_error_func, func,
305 sizeof(es->s_first_error_func));
306 es->s_first_error_line = cpu_to_le32(line);
307 es->s_first_error_ino = es->s_last_error_ino;
308 es->s_first_error_block = es->s_last_error_block;
309 }
66e61a9e
TT		 310 /*
311 * Start the daily error reporting function if it hasn't been
312 * started already
313 */
314 if (!es->s_error_count)
315 mod_timer(&EXT4_SB(sb)->s_err_report, jiffies + 24*60*60*HZ);
ba39ebb6 316 le32_add_cpu(&es->s_error_count, 1);
1c13d5c0
TT		 317}
318
319static void save_error_info(struct super_block *sb, const char *func,
320 unsigned int line)
321{
322 __save_error_info(sb, func, line);
323 ext4_commit_super(sb, 1);
324}
325
7c2e7087
TT		 326/*
327 * The del_gendisk() function uninitializes the disk-specific data
328 * structures, including the bdi structure, without telling anyone
329 * else. Once this happens, any attempt to call mark_buffer_dirty()
330 * (for example, by ext4_commit_super), will cause a kernel OOPS.
331 * This is a kludge to prevent these oops until we can put in a proper
332 * hook in del_gendisk() to inform the VFS and file system layers.
333 */
334static int block_device_ejected(struct super_block *sb)
335{
336 struct inode *bd_inode = sb->s_bdev->bd_inode;
337 struct backing_dev_info *bdi = bd_inode->i_mapping->backing_dev_info;
338
339 return bdi->dev == NULL;
340}
341
18aadd47
BJ		 342static void ext4_journal_commit_callback(journal_t *journal, transaction_t *txn)
343{
344 struct super_block *sb = journal->j_private;
345 struct ext4_sb_info *sbi = EXT4_SB(sb);
346 int error = is_journal_aborted(journal);
5d3ee208 347 struct ext4_journal_cb_entry *jce;
18aadd47 348
5d3ee208 349 BUG_ON(txn->t_state == T_FINISHED);
18aadd47 350 spin_lock(&sbi->s_md_lock);
5d3ee208
DM		 351 while (!list_empty(&txn->t_private_list)) {
352 jce = list_entry(txn->t_private_list.next,
353 struct ext4_journal_cb_entry, jce_list);
18aadd47
BJ		 354 list_del_init(&jce->jce_list);
355 spin_unlock(&sbi->s_md_lock);
356 jce->jce_func(sb, jce, error);
357 spin_lock(&sbi->s_md_lock);
358 }
359 spin_unlock(&sbi->s_md_lock);
360}
1c13d5c0 361
ac27a0ec
DK		 362/* Deal with the reporting of failure conditions on a filesystem such as
363 * inconsistencies detected or read IO failures.
364 *
365 * On ext2, we can store the error state of the filesystem in the
617ba13b 366 * superblock. That is not possible on ext4, because we may have other
ac27a0ec
DK		 367 * write ordering constraints on the superblock which prevent us from
368 * writing it out straight away; and given that the journal is about to
369 * be aborted, we can't rely on the current, or future, transactions to
370 * write out the superblock safely.
371 *
dab291af 372 * We'll just use the jbd2_journal_abort() error code to record an error in
d6b198bc 373 * the journal instead. On recovery, the journal will complain about
ac27a0ec
DK		 374 * that error until we've noted it down and cleared it.
375 */
376
617ba13b 377static void ext4_handle_error(struct super_block *sb)
ac27a0ec 378{
ac27a0ec
DK		 379 if (sb->s_flags & MS_RDONLY)
380 return;
381
2b2d6d01 382 if (!test_opt(sb, ERRORS_CONT)) {
617ba13b 383 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 384
4ab2f15b 385 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
ac27a0ec 386 if (journal)
dab291af 387 jbd2_journal_abort(journal, -EIO);
ac27a0ec 388 }
2b2d6d01 389 if (test_opt(sb, ERRORS_RO)) {
b31e1552 390 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
4418e141
DM		 391 /*
392 * Make sure updated value of ->s_mount_flags will be visible
393 * before ->s_flags update
394 */
395 smp_wmb();
ac27a0ec
DK		 396 sb->s_flags |= MS_RDONLY;
397 }
ac27a0ec 398 if (test_opt(sb, ERRORS_PANIC))
617ba13b 399 panic("EXT4-fs (device %s): panic forced after error\n",
ac27a0ec
DK		 400 sb->s_id);
401}
402
efbed4dc
TT		 403#define ext4_error_ratelimit(sb) \
404 ___ratelimit(&(EXT4_SB(sb)->s_err_ratelimit_state), \
405 "EXT4-fs error")
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
efbed4dc
TT		 413 if (ext4_error_ratelimit(sb)) {
414 va_start(args, fmt);
415 vaf.fmt = fmt;
416 vaf.va = &args;
417 printk(KERN_CRIT
418 "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n",
419 sb->s_id, function, line, current->comm, &vaf);
420 va_end(args);
421 }
f3fc0210 422 save_error_info(sb, function, line);
617ba13b 423 ext4_handle_error(sb);
ac27a0ec
DK		 424}
425
e7c96e8e
JP		 426void __ext4_error_inode(struct inode *inode, const char *function,
427 unsigned int line, ext4_fsblk_t block,
428 const char *fmt, ...)
273df556
FM		 429{
430 va_list args;
f7c21177 431 struct va_format vaf;
1c13d5c0 432 struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
273df556 433
1c13d5c0
TT		 434 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
435 es->s_last_error_block = cpu_to_le64(block);
efbed4dc
TT		 436 if (ext4_error_ratelimit(inode->i_sb)) {
437 va_start(args, fmt);
438 vaf.fmt = fmt;
439 vaf.va = &args;
440 if (block)
441 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
442 "inode #%lu: block %llu: comm %s: %pV\n",
443 inode->i_sb->s_id, function, line, inode->i_ino,
444 block, current->comm, &vaf);
445 else
446 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
447 "inode #%lu: comm %s: %pV\n",
448 inode->i_sb->s_id, function, line, inode->i_ino,
449 current->comm, &vaf);
450 va_end(args);
451 }
1c13d5c0 452 save_error_info(inode->i_sb, function, line);
273df556
FM		 453 ext4_handle_error(inode->i_sb);
454}
455
e7c96e8e
JP		 456void __ext4_error_file(struct file *file, const char *function,
457 unsigned int line, ext4_fsblk_t block,
458 const char *fmt, ...)
273df556
FM		 459{
460 va_list args;
f7c21177 461 struct va_format vaf;
1c13d5c0 462 struct ext4_super_block *es;
496ad9aa 463 struct inode *inode = file_inode(file);
273df556
FM		 464 char pathname[80], *path;
465
1c13d5c0
TT		 466 es = EXT4_SB(inode->i_sb)->s_es;
467 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
efbed4dc
TT		 468 if (ext4_error_ratelimit(inode->i_sb)) {
469 path = d_path(&(file->f_path), pathname, sizeof(pathname));
470 if (IS_ERR(path))
471 path = "(unknown)";
472 va_start(args, fmt);
473 vaf.fmt = fmt;
474 vaf.va = &args;
475 if (block)
476 printk(KERN_CRIT
477 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
478 "block %llu: comm %s: path %s: %pV\n",
479 inode->i_sb->s_id, function, line, inode->i_ino,
480 block, current->comm, path, &vaf);
481 else
482 printk(KERN_CRIT
483 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
484 "comm %s: path %s: %pV\n",
485 inode->i_sb->s_id, function, line, inode->i_ino,
486 current->comm, path, &vaf);
487 va_end(args);
488 }
1c13d5c0 489 save_error_info(inode->i_sb, function, line);
273df556
FM		 490 ext4_handle_error(inode->i_sb);
491}
492
722887dd
TT		 493const char *ext4_decode_error(struct super_block *sb, int errno,
494 char nbuf[16])
ac27a0ec
DK		 495{
496 char *errstr = NULL;
497
498 switch (errno) {
499 case -EIO:
500 errstr = "IO failure";
501 break;
502 case -ENOMEM:
503 errstr = "Out of memory";
504 break;
505 case -EROFS:
78f1ddbb
TT		 506 if (!sb || (EXT4_SB(sb)->s_journal &&
507 EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT))
ac27a0ec
DK		 508 errstr = "Journal has aborted";
509 else
510 errstr = "Readonly filesystem";
511 break;
512 default:
513 /* If the caller passed in an extra buffer for unknown
514 * errors, textualise them now. Else we just return
515 * NULL. */
516 if (nbuf) {
517 /* Check for truncated error codes... */
518 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
519 errstr = nbuf;
520 }
521 break;
522 }
523
524 return errstr;
525}
526
617ba13b 527/* __ext4_std_error decodes expected errors from journaling functions
ac27a0ec
DK		 528 * automatically and invokes the appropriate error response. */
529
c398eda0
TT		 530void __ext4_std_error(struct super_block *sb, const char *function,
531 unsigned int line, int errno)
ac27a0ec
DK		 532{
533 char nbuf[16];
534 const char *errstr;
535
536 /* Special case: if the error is EROFS, and we're not already
537 * inside a transaction, then there's really no point in logging
538 * an error. */
539 if (errno == -EROFS && journal_current_handle() == NULL &&
540 (sb->s_flags & MS_RDONLY))
541 return;
542
efbed4dc
TT		 543 if (ext4_error_ratelimit(sb)) {
544 errstr = ext4_decode_error(sb, errno, nbuf);
545 printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n",
546 sb->s_id, function, line, errstr);
547 }
ac27a0ec 548
efbed4dc 549 save_error_info(sb, function, line);
617ba13b 550 ext4_handle_error(sb);
ac27a0ec
DK		 551}
552
553/*
617ba13b 554 * ext4_abort is a much stronger failure handler than ext4_error. The
ac27a0ec
DK		 555 * abort function may be used to deal with unrecoverable failures such
556 * as journal IO errors or ENOMEM at a critical moment in log management.
557 *
558 * We unconditionally force the filesystem into an ABORT|READONLY state,
559 * unless the error response on the fs has been set to panic in which
560 * case we take the easy way out and panic immediately.
561 */
562
c67d859e 563void __ext4_abort(struct super_block *sb, const char *function,
c398eda0 564 unsigned int line, const char *fmt, ...)
ac27a0ec
DK		 565{
566 va_list args;
567
1c13d5c0 568 save_error_info(sb, function, line);
ac27a0ec 569 va_start(args, fmt);
c398eda0
TT		 570 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: ", sb->s_id,
571 function, line);
ac27a0ec
DK		 572 vprintk(fmt, args);
573 printk("\n");
574 va_end(args);
575
1c13d5c0
TT		 576 if ((sb->s_flags & MS_RDONLY) == 0) {
577 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
1c13d5c0 578 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
4418e141
DM		 579 /*
580 * Make sure updated value of ->s_mount_flags will be visible
581 * before ->s_flags update
582 */
583 smp_wmb();
584 sb->s_flags |= MS_RDONLY;
1c13d5c0
TT		 585 if (EXT4_SB(sb)->s_journal)
586 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
587 save_error_info(sb, function, line);
588 }
ac27a0ec 589 if (test_opt(sb, ERRORS_PANIC))
617ba13b 590 panic("EXT4-fs panic from previous error\n");
ac27a0ec
DK		 591}
592
e7c96e8e
JP		 593void __ext4_msg(struct super_block *sb,
594 const char *prefix, const char *fmt, ...)
b31e1552 595{
0ff2ea7d 596 struct va_format vaf;
b31e1552
ES		 597 va_list args;
598
efbed4dc
TT		 599 if (!___ratelimit(&(EXT4_SB(sb)->s_msg_ratelimit_state), "EXT4-fs"))
600 return;
601
b31e1552 602 va_start(args, fmt);
0ff2ea7d
JP		 603 vaf.fmt = fmt;
604 vaf.va = &args;
605 printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
b31e1552
ES		 606 va_end(args);
607}
608
12062ddd 609void __ext4_warning(struct super_block *sb, const char *function,
c398eda0 610 unsigned int line, const char *fmt, ...)
ac27a0ec 611{
0ff2ea7d 612 struct va_format vaf;
ac27a0ec
DK		 613 va_list args;
614
efbed4dc
TT		 615 if (!___ratelimit(&(EXT4_SB(sb)->s_warning_ratelimit_state),
616 "EXT4-fs warning"))
617 return;
618
ac27a0ec 619 va_start(args, fmt);
0ff2ea7d
JP		 620 vaf.fmt = fmt;
621 vaf.va = &args;
622 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: %pV\n",
623 sb->s_id, function, line, &vaf);
ac27a0ec
DK		 624 va_end(args);
625}
626
e29136f8
TT		 627void __ext4_grp_locked_error(const char *function, unsigned int line,
628 struct super_block *sb, ext4_group_t grp,
629 unsigned long ino, ext4_fsblk_t block,
630 const char *fmt, ...)
5d1b1b3f
AK		 631__releases(bitlock)
632__acquires(bitlock)
633{
0ff2ea7d 634 struct va_format vaf;
5d1b1b3f
AK		 635 va_list args;
636 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
637
1c13d5c0
TT		 638 es->s_last_error_ino = cpu_to_le32(ino);
639 es->s_last_error_block = cpu_to_le64(block);
640 __save_error_info(sb, function, line);
0ff2ea7d 641
efbed4dc
TT		 642 if (ext4_error_ratelimit(sb)) {
643 va_start(args, fmt);
644 vaf.fmt = fmt;
645 vaf.va = &args;
646 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u, ",
647 sb->s_id, function, line, grp);
648 if (ino)
649 printk(KERN_CONT "inode %lu: ", ino);
650 if (block)
651 printk(KERN_CONT "block %llu:",
652 (unsigned long long) block);
653 printk(KERN_CONT "%pV\n", &vaf);
654 va_end(args);
655 }
5d1b1b3f
AK		 656
657 if (test_opt(sb, ERRORS_CONT)) {
e2d67052 658 ext4_commit_super(sb, 0);
5d1b1b3f
AK		 659 return;
660 }
1c13d5c0 661
5d1b1b3f
AK		 662 ext4_unlock_group(sb, grp);
663 ext4_handle_error(sb);
664 /*
665 * We only get here in the ERRORS_RO case; relocking the group
666 * may be dangerous, but nothing bad will happen since the
667 * filesystem will have already been marked read/only and the
668 * journal has been aborted. We return 1 as a hint to callers
669 * who might what to use the return value from
25985edc 670 * ext4_grp_locked_error() to distinguish between the
5d1b1b3f
AK		 671 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
672 * aggressively from the ext4 function in question, with a
673 * more appropriate error code.
674 */
675 ext4_lock_group(sb, grp);
676 return;
677}
678
617ba13b 679void ext4_update_dynamic_rev(struct super_block *sb)
ac27a0ec 680{
617ba13b 681 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
ac27a0ec 682
617ba13b 683 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
ac27a0ec
DK		 684 return;
685
12062ddd 686 ext4_warning(sb,
ac27a0ec
DK		 687 "updating to rev %d because of new feature flag, "
688 "running e2fsck is recommended",
617ba13b 689 EXT4_DYNAMIC_REV);
ac27a0ec 690
617ba13b
MC		 691 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
692 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
693 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
ac27a0ec
DK		 694 /* leave es->s_feature_*compat flags alone */
695 /* es->s_uuid will be set by e2fsck if empty */
696
697 /*
698 * The rest of the superblock fields should be zero, and if not it
699 * means they are likely already in use, so leave them alone. We
700 * can leave it up to e2fsck to clean up any inconsistencies there.
701 */
702}
703
704/*
705 * Open the external journal device
706 */
b31e1552 707static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb)
ac27a0ec
DK		 708{
709 struct block_device *bdev;
710 char b[BDEVNAME_SIZE];
711
d4d77629 712 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
ac27a0ec
DK		 713 if (IS_ERR(bdev))
714 goto fail;
715 return bdev;
716
717fail:
b31e1552 718 ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld",
ac27a0ec
DK		 719 __bdevname(dev, b), PTR_ERR(bdev));
720 return NULL;
721}
722
723/*
724 * Release the journal device
725 */
4385bab1 726static void ext4_blkdev_put(struct block_device *bdev)
ac27a0ec 727{
4385bab1 728 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
ac27a0ec
DK		 729}
730
4385bab1 731static void ext4_blkdev_remove(struct ext4_sb_info *sbi)
ac27a0ec
DK		 732{
733 struct block_device *bdev;
ac27a0ec
DK		 734 bdev = sbi->journal_bdev;
735 if (bdev) {
4385bab1 736 ext4_blkdev_put(bdev);
ac27a0ec
DK		 737 sbi->journal_bdev = NULL;
738 }
ac27a0ec
DK		 739}
740
741static inline struct inode *orphan_list_entry(struct list_head *l)
742{
617ba13b 743 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
ac27a0ec
DK		 744}
745
617ba13b 746static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
ac27a0ec
DK		 747{
748 struct list_head *l;
749
b31e1552
ES		 750 ext4_msg(sb, KERN_ERR, "sb orphan head is %d",
751 le32_to_cpu(sbi->s_es->s_last_orphan));
ac27a0ec
DK		 752
753 printk(KERN_ERR "sb_info orphan list:\n");
754 list_for_each(l, &sbi->s_orphan) {
755 struct inode *inode = orphan_list_entry(l);
756 printk(KERN_ERR " "
757 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
758 inode->i_sb->s_id, inode->i_ino, inode,
759 inode->i_mode, inode->i_nlink,
760 NEXT_ORPHAN(inode));
761 }
762}
763
2b2d6d01 764static void ext4_put_super(struct super_block *sb)
ac27a0ec 765{
617ba13b
MC		 766 struct ext4_sb_info *sbi = EXT4_SB(sb);
767 struct ext4_super_block *es = sbi->s_es;
ef2cabf7 768 int i, err;
ac27a0ec 769
857ac889 770 ext4_unregister_li_request(sb);
e0ccfd95
CH		 771 dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
772
2e8fa54e 773 flush_workqueue(sbi->rsv_conversion_wq);
2e8fa54e 774 destroy_workqueue(sbi->rsv_conversion_wq);
4c0425ff 775
0390131b
FM		 776 if (sbi->s_journal) {
777 err = jbd2_journal_destroy(sbi->s_journal);
778 sbi->s_journal = NULL;
779 if (err < 0)
c67d859e 780 ext4_abort(sb, "Couldn't clean up the journal");
0390131b 781 }
d4edac31 782
d3922a77 783 ext4_es_unregister_shrinker(sbi);
9105bb14 784 del_timer_sync(&sbi->s_err_report);
d4edac31
JB		 785 ext4_release_system_zone(sb);
786 ext4_mb_release(sb);
787 ext4_ext_release(sb);
788 ext4_xattr_put_super(sb);
789
ac27a0ec 790 if (!(sb->s_flags & MS_RDONLY)) {
617ba13b 791 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
ac27a0ec 792 es->s_state = cpu_to_le16(sbi->s_mount_state);
ac27a0ec 793 }
58c5873a 794 if (!(sb->s_flags & MS_RDONLY))
a8e25a83
AB		 795 ext4_commit_super(sb, 1);
796
240799cd 797 if (sbi->s_proc) {
66acdcf4 798 remove_proc_entry("options", sbi->s_proc);
9f6200bb 799 remove_proc_entry(sb->s_id, ext4_proc_root);
240799cd 800 }
3197ebdb 801 kobject_del(&sbi->s_kobj);
ac27a0ec
DK		 802
803 for (i = 0; i < sbi->s_gdb_count; i++)
804 brelse(sbi->s_group_desc[i]);
b93b41d4
AV		 805 kvfree(sbi->s_group_desc);
806 kvfree(sbi->s_flex_groups);
57042651 807 percpu_counter_destroy(&sbi->s_freeclusters_counter);
ac27a0ec
DK		 808 percpu_counter_destroy(&sbi->s_freeinodes_counter);
809 percpu_counter_destroy(&sbi->s_dirs_counter);
57042651 810 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
ac27a0ec
DK		 811 brelse(sbi->s_sbh);
812#ifdef CONFIG_QUOTA
a2d4a646 813 for (i = 0; i < EXT4_MAXQUOTAS; i++)
ac27a0ec
DK		 814 kfree(sbi->s_qf_names[i]);
815#endif
816
817 /* Debugging code just in case the in-memory inode orphan list
818 * isn't empty. The on-disk one can be non-empty if we've
819 * detected an error and taken the fs readonly, but the
820 * in-memory list had better be clean by this point. */
821 if (!list_empty(&sbi->s_orphan))
822 dump_orphan_list(sb, sbi);
823 J_ASSERT(list_empty(&sbi->s_orphan));
824
f98393a6 825 invalidate_bdev(sb->s_bdev);
ac27a0ec
DK		 826 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
827 /*
828 * Invalidate the journal device's buffers. We don't want them
829 * floating about in memory - the physical journal device may
830 * hotswapped, and it breaks the `ro-after' testing code.
831 */
832 sync_blockdev(sbi->journal_bdev);
f98393a6 833 invalidate_bdev(sbi->journal_bdev);
617ba13b 834 ext4_blkdev_remove(sbi);
ac27a0ec 835 }
9c191f70
M		 836 if (sbi->s_mb_cache) {
837 ext4_xattr_destroy_cache(sbi->s_mb_cache);
838 sbi->s_mb_cache = NULL;
839 }
c5e06d10
JL		 840 if (sbi->s_mmp_tsk)
841 kthread_stop(sbi->s_mmp_tsk);
ac27a0ec 842 sb->s_fs_info = NULL;
3197ebdb
TT		 843 /*
844 * Now that we are completely done shutting down the
845 * superblock, we need to actually destroy the kobject.
846 */
3197ebdb
TT		 847 kobject_put(&sbi->s_kobj);
848 wait_for_completion(&sbi->s_kobj_unregister);
0441984a
DW		 849 if (sbi->s_chksum_driver)
850 crypto_free_shash(sbi->s_chksum_driver);
705895b6 851 kfree(sbi->s_blockgroup_lock);
ac27a0ec 852 kfree(sbi);
ac27a0ec
DK		 853}
854
e18b890b 855static struct kmem_cache *ext4_inode_cachep;
ac27a0ec
DK		 856
857/*
858 * Called inside transaction, so use GFP_NOFS
859 */
617ba13b 860static struct inode *ext4_alloc_inode(struct super_block *sb)
ac27a0ec 861{
617ba13b 862 struct ext4_inode_info *ei;
ac27a0ec 863
e6b4f8da 864 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
ac27a0ec
DK		 865 if (!ei)
866 return NULL;
0b8e58a1 867
ac27a0ec 868 ei->vfs_inode.i_version = 1;
202ee5df 869 spin_lock_init(&ei->i_raw_lock);
c9de560d
AT		 870 INIT_LIST_HEAD(&ei->i_prealloc_list);
871 spin_lock_init(&ei->i_prealloc_lock);
9a26b661
ZL		 872 ext4_es_init_tree(&ei->i_es_tree);
873 rwlock_init(&ei->i_es_lock);
edaa53ca 874 INIT_LIST_HEAD(&ei->i_es_list);
eb68d0e2 875 ei->i_es_all_nr = 0;
edaa53ca 876 ei->i_es_shk_nr = 0;
dd475925 877 ei->i_es_shrink_lblk = 0;
d2a17637
MC		 878 ei->i_reserved_data_blocks = 0;
879 ei->i_reserved_meta_blocks = 0;
880 ei->i_allocated_meta_blocks = 0;
9d0be502 881 ei->i_da_metadata_calc_len = 0;
7e731bc9 882 ei->i_da_metadata_calc_last_lblock = 0;
d2a17637 883 spin_lock_init(&(ei->i_block_reservation_lock));
a9e7f447
DM		 884#ifdef CONFIG_QUOTA
885 ei->i_reserved_quota = 0;
886#endif
8aefcd55 887 ei->jinode = NULL;
2e8fa54e 888 INIT_LIST_HEAD(&ei->i_rsv_conversion_list);
744692dc 889 spin_lock_init(&ei->i_completed_io_lock);
b436b9be
JK		 890 ei->i_sync_tid = 0;
891 ei->i_datasync_tid = 0;
f7ad6d2e 892 atomic_set(&ei->i_ioend_count, 0);
e27f41e1 893 atomic_set(&ei->i_unwritten, 0);
2e8fa54e 894 INIT_WORK(&ei->i_rsv_conversion_work, ext4_end_io_rsv_work);
0b8e58a1 895
ac27a0ec
DK		 896 return &ei->vfs_inode;
897}
898
7ff9c073
TT		 899static int ext4_drop_inode(struct inode *inode)
900{
901 int drop = generic_drop_inode(inode);
902
903 trace_ext4_drop_inode(inode, drop);
904 return drop;
905}
906
fa0d7e3d
NP		 907static void ext4_i_callback(struct rcu_head *head)
908{
909 struct inode *inode = container_of(head, struct inode, i_rcu);
fa0d7e3d
NP		 910 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
911}
912
617ba13b 913static void ext4_destroy_inode(struct inode *inode)
ac27a0ec 914{
9f7dd93d 915 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
b31e1552
ES		 916 ext4_msg(inode->i_sb, KERN_ERR,
917 "Inode %lu (%p): orphan list check failed!",
918 inode->i_ino, EXT4_I(inode));
9f7dd93d
VA		 919 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
920 EXT4_I(inode), sizeof(struct ext4_inode_info),
921 true);
922 dump_stack();
923 }
fa0d7e3d 924 call_rcu(&inode->i_rcu, ext4_i_callback);
ac27a0ec
DK		 925}
926
51cc5068 927static void init_once(void *foo)
ac27a0ec 928{
617ba13b 929 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
ac27a0ec 930
a35afb83 931 INIT_LIST_HEAD(&ei->i_orphan);
a35afb83 932 init_rwsem(&ei->xattr_sem);
0e855ac8 933 init_rwsem(&ei->i_data_sem);
a35afb83 934 inode_init_once(&ei->vfs_inode);
ac27a0ec
DK		 935}
936
e67bc2b3 937static int __init init_inodecache(void)
ac27a0ec 938{
617ba13b
MC		 939 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
940 sizeof(struct ext4_inode_info),
ac27a0ec
DK		 941 0, (SLAB_RECLAIM_ACCOUNT|
942 SLAB_MEM_SPREAD),
20c2df83 943 init_once);
617ba13b 944 if (ext4_inode_cachep == NULL)
ac27a0ec
DK		 945 return -ENOMEM;
946 return 0;
947}
948
949static void destroy_inodecache(void)
950{
8c0a8537
KS		 951 /*
952 * Make sure all delayed rcu free inodes are flushed before we
953 * destroy cache.
954 */
955 rcu_barrier();
617ba13b 956 kmem_cache_destroy(ext4_inode_cachep);
ac27a0ec
DK		 957}
958
0930fcc1 959void ext4_clear_inode(struct inode *inode)
ac27a0ec 960{
0930fcc1 961 invalidate_inode_buffers(inode);
dbd5768f 962 clear_inode(inode);
9f754758 963 dquot_drop(inode);
c2ea3fde 964 ext4_discard_preallocations(inode);
51865fda 965 ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS);
8aefcd55
TT		 966 if (EXT4_I(inode)->jinode) {
967 jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode),
968 EXT4_I(inode)->jinode);
969 jbd2_free_inode(EXT4_I(inode)->jinode);
970 EXT4_I(inode)->jinode = NULL;
971 }
ac27a0ec
DK		 972}
973
1b961ac0 974static struct inode *ext4_nfs_get_inode(struct super_block *sb,
0b8e58a1 975 u64 ino, u32 generation)
ac27a0ec 976{
ac27a0ec 977 struct inode *inode;
ac27a0ec 978
617ba13b 979 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
ac27a0ec 980 return ERR_PTR(-ESTALE);
617ba13b 981 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
ac27a0ec
DK		 982 return ERR_PTR(-ESTALE);
983
984 /* iget isn't really right if the inode is currently unallocated!!
985 *
617ba13b 986 * ext4_read_inode will return a bad_inode if the inode had been
ac27a0ec
DK		 987 * deleted, so we should be safe.
988 *
989 * Currently we don't know the generation for parent directory, so
990 * a generation of 0 means "accept any"
991 */
f4bb2981 992 inode = ext4_iget_normal(sb, ino);
1d1fe1ee
DH		 993 if (IS_ERR(inode))
994 return ERR_CAST(inode);
995 if (generation && inode->i_generation != generation) {
ac27a0ec
DK		 996 iput(inode);
997 return ERR_PTR(-ESTALE);
998 }
1b961ac0
CH		 999
1000 return inode;
1001}
1002
1003static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
0b8e58a1 1004 int fh_len, int fh_type)
1b961ac0
CH		 1005{
1006 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
1007 ext4_nfs_get_inode);
1008}
1009
1010static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
0b8e58a1 1011 int fh_len, int fh_type)
1b961ac0
CH		 1012{
1013 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
1014 ext4_nfs_get_inode);
ac27a0ec
DK		 1015}
1016
c39a7f84
TO		 1017/*
1018 * Try to release metadata pages (indirect blocks, directories) which are
1019 * mapped via the block device. Since these pages could have journal heads
1020 * which would prevent try_to_free_buffers() from freeing them, we must use
1021 * jbd2 layer's try_to_free_buffers() function to release them.
1022 */
0b8e58a1
AD		 1023static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
1024 gfp_t wait)
c39a7f84
TO		 1025{
1026 journal_t *journal = EXT4_SB(sb)->s_journal;
1027
1028 WARN_ON(PageChecked(page));
1029 if (!page_has_buffers(page))
1030 return 0;
1031 if (journal)
1032 return jbd2_journal_try_to_free_buffers(journal, page,
1033 wait & ~__GFP_WAIT);
1034 return try_to_free_buffers(page);
1035}
1036
ac27a0ec 1037#ifdef CONFIG_QUOTA
af5bc92d 1038#define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
2b2d6d01 1039#define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
ac27a0ec 1040
617ba13b
MC		 1041static int ext4_write_dquot(struct dquot *dquot);
1042static int ext4_acquire_dquot(struct dquot *dquot);
1043static int ext4_release_dquot(struct dquot *dquot);
1044static int ext4_mark_dquot_dirty(struct dquot *dquot);
1045static int ext4_write_info(struct super_block *sb, int type);
6f28e087 1046static int ext4_quota_on(struct super_block *sb, int type, int format_id,
f00c9e44 1047 struct path *path);
7c319d32
AK		 1048static int ext4_quota_on_sysfile(struct super_block *sb, int type,
1049 int format_id);
ca0e05e4 1050static int ext4_quota_off(struct super_block *sb, int type);
7c319d32 1051static int ext4_quota_off_sysfile(struct super_block *sb, int type);
617ba13b
MC		 1052static int ext4_quota_on_mount(struct super_block *sb, int type);
1053static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec 1054 size_t len, loff_t off);
617ba13b 1055static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec 1056 const char *data, size_t len, loff_t off);
7c319d32
AK		 1057static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
1058 unsigned int flags);
1059static int ext4_enable_quotas(struct super_block *sb);
ac27a0ec 1060
61e225dc 1061static const struct dquot_operations ext4_quota_operations = {
60e58e0f 1062 .get_reserved_space = ext4_get_reserved_space,
617ba13b
MC		 1063 .write_dquot = ext4_write_dquot,
1064 .acquire_dquot = ext4_acquire_dquot,
1065 .release_dquot = ext4_release_dquot,
1066 .mark_dirty = ext4_mark_dquot_dirty,
a5b5ee32
JK		 1067 .write_info = ext4_write_info,
1068 .alloc_dquot = dquot_alloc,
1069 .destroy_dquot = dquot_destroy,
ac27a0ec
DK		 1070};
1071
0d54b217 1072static const struct quotactl_ops ext4_qctl_operations = {
617ba13b 1073 .quota_on = ext4_quota_on,
ca0e05e4 1074 .quota_off = ext4_quota_off,
287a8095
CH		 1075 .quota_sync = dquot_quota_sync,
1076 .get_info = dquot_get_dqinfo,
1077 .set_info = dquot_set_dqinfo,
1078 .get_dqblk = dquot_get_dqblk,
1079 .set_dqblk = dquot_set_dqblk
ac27a0ec 1080};
7c319d32
AK		 1081
1082static const struct quotactl_ops ext4_qctl_sysfile_operations = {
1083 .quota_on_meta = ext4_quota_on_sysfile,
1084 .quota_off = ext4_quota_off_sysfile,
1085 .quota_sync = dquot_quota_sync,
1086 .get_info = dquot_get_dqinfo,
1087 .set_info = dquot_set_dqinfo,
1088 .get_dqblk = dquot_get_dqblk,
1089 .set_dqblk = dquot_set_dqblk
1090};
ac27a0ec
DK		 1091#endif
1092
ee9b6d61 1093static const struct super_operations ext4_sops = {
617ba13b
MC		 1094 .alloc_inode = ext4_alloc_inode,
1095 .destroy_inode = ext4_destroy_inode,
617ba13b
MC		 1096 .write_inode = ext4_write_inode,
1097 .dirty_inode = ext4_dirty_inode,
7ff9c073 1098 .drop_inode = ext4_drop_inode,
0930fcc1 1099 .evict_inode = ext4_evict_inode,
617ba13b 1100 .put_super = ext4_put_super,
617ba13b 1101 .sync_fs = ext4_sync_fs,
c4be0c1d
TS		 1102 .freeze_fs = ext4_freeze,
1103 .unfreeze_fs = ext4_unfreeze,
617ba13b
MC		 1104 .statfs = ext4_statfs,
1105 .remount_fs = ext4_remount,
617ba13b 1106 .show_options = ext4_show_options,
ac27a0ec 1107#ifdef CONFIG_QUOTA
617ba13b
MC		 1108 .quota_read = ext4_quota_read,
1109 .quota_write = ext4_quota_write,
ac27a0ec 1110#endif
c39a7f84 1111 .bdev_try_to_free_page = bdev_try_to_free_page,
ac27a0ec
DK		 1112};
1113
39655164 1114static const struct export_operations ext4_export_ops = {
1b961ac0
CH		 1115 .fh_to_dentry = ext4_fh_to_dentry,
1116 .fh_to_parent = ext4_fh_to_parent,
617ba13b 1117 .get_parent = ext4_get_parent,
ac27a0ec
DK		 1118};
1119
1120enum {
1121 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
1122 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
72578c33 1123 Opt_nouid32, Opt_debug, Opt_removed,
ac27a0ec 1124 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
72578c33 1125 Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload,
ad4eec61
ES		 1126 Opt_commit, Opt_min_batch_time, Opt_max_batch_time, Opt_journal_dev,
1127 Opt_journal_path, Opt_journal_checksum, Opt_journal_async_commit,
ac27a0ec 1128 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
296c355c 1129 Opt_data_err_abort, Opt_data_err_ignore,
ac27a0ec 1130 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
5a20bdfc 1131 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
ee4a3fcd 1132 Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err,
661aa520 1133 Opt_usrquota, Opt_grpquota, Opt_i_version,
1449032b
TT		 1134 Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_mblk_io_submit,
1135 Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity,
5328e635 1136 Opt_inode_readahead_blks, Opt_journal_ioprio,
744692dc 1137 Opt_dioread_nolock, Opt_dioread_lock,
fc6cb1cd 1138 Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable,
c6d3d56d 1139 Opt_max_dir_size_kb, Opt_nojournal_checksum,
ac27a0ec
DK		 1140};
1141
a447c093 1142static const match_table_t tokens = {
ac27a0ec
DK		 1143 {Opt_bsd_df, "bsddf"},
1144 {Opt_minix_df, "minixdf"},
1145 {Opt_grpid, "grpid"},
1146 {Opt_grpid, "bsdgroups"},
1147 {Opt_nogrpid, "nogrpid"},
1148 {Opt_nogrpid, "sysvgroups"},
1149 {Opt_resgid, "resgid=%u"},
1150 {Opt_resuid, "resuid=%u"},
1151 {Opt_sb, "sb=%u"},
1152 {Opt_err_cont, "errors=continue"},
1153 {Opt_err_panic, "errors=panic"},
1154 {Opt_err_ro, "errors=remount-ro"},
1155 {Opt_nouid32, "nouid32"},
ac27a0ec 1156 {Opt_debug, "debug"},
72578c33
TT		 1157 {Opt_removed, "oldalloc"},
1158 {Opt_removed, "orlov"},
ac27a0ec
DK		 1159 {Opt_user_xattr, "user_xattr"},
1160 {Opt_nouser_xattr, "nouser_xattr"},
1161 {Opt_acl, "acl"},
1162 {Opt_noacl, "noacl"},
e3bb52ae 1163 {Opt_noload, "norecovery"},
5a916be1 1164 {Opt_noload, "noload"},
72578c33
TT		 1165 {Opt_removed, "nobh"},
1166 {Opt_removed, "bh"},
ac27a0ec 1167 {Opt_commit, "commit=%u"},
30773840
TT		 1168 {Opt_min_batch_time, "min_batch_time=%u"},
1169 {Opt_max_batch_time, "max_batch_time=%u"},
ac27a0ec 1170 {Opt_journal_dev, "journal_dev=%u"},
ad4eec61 1171 {Opt_journal_path, "journal_path=%s"},
818d276c 1172 {Opt_journal_checksum, "journal_checksum"},
c6d3d56d 1173 {Opt_nojournal_checksum, "nojournal_checksum"},
818d276c 1174 {Opt_journal_async_commit, "journal_async_commit"},
ac27a0ec
DK		 1175 {Opt_abort, "abort"},
1176 {Opt_data_journal, "data=journal"},
1177 {Opt_data_ordered, "data=ordered"},
1178 {Opt_data_writeback, "data=writeback"},
5bf5683a
HK		 1179 {Opt_data_err_abort, "data_err=abort"},
1180 {Opt_data_err_ignore, "data_err=ignore"},
ac27a0ec
DK		 1181 {Opt_offusrjquota, "usrjquota="},
1182 {Opt_usrjquota, "usrjquota=%s"},
1183 {Opt_offgrpjquota, "grpjquota="},
1184 {Opt_grpjquota, "grpjquota=%s"},
1185 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
1186 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
5a20bdfc 1187 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
ac27a0ec
DK		 1188 {Opt_grpquota, "grpquota"},
1189 {Opt_noquota, "noquota"},
1190 {Opt_quota, "quota"},
1191 {Opt_usrquota, "usrquota"},
1192 {Opt_barrier, "barrier=%u"},
06705bff
TT		 1193 {Opt_barrier, "barrier"},
1194 {Opt_nobarrier, "nobarrier"},
25ec56b5 1195 {Opt_i_version, "i_version"},
c9de560d 1196 {Opt_stripe, "stripe=%u"},
64769240 1197 {Opt_delalloc, "delalloc"},
dd919b98 1198 {Opt_nodelalloc, "nodelalloc"},
36ade451
JK		 1199 {Opt_removed, "mblk_io_submit"},
1200 {Opt_removed, "nomblk_io_submit"},
6fd058f7
TT		 1201 {Opt_block_validity, "block_validity"},
1202 {Opt_noblock_validity, "noblock_validity"},
240799cd 1203 {Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
b3881f74 1204 {Opt_journal_ioprio, "journal_ioprio=%u"},
afd4672d 1205 {Opt_auto_da_alloc, "auto_da_alloc=%u"},
06705bff
TT		 1206 {Opt_auto_da_alloc, "auto_da_alloc"},
1207 {Opt_noauto_da_alloc, "noauto_da_alloc"},
744692dc
JZ		 1208 {Opt_dioread_nolock, "dioread_nolock"},
1209 {Opt_dioread_lock, "dioread_lock"},
5328e635
ES		 1210 {Opt_discard, "discard"},
1211 {Opt_nodiscard, "nodiscard"},
fc6cb1cd
TT		 1212 {Opt_init_itable, "init_itable=%u"},
1213 {Opt_init_itable, "init_itable"},
1214 {Opt_noinit_itable, "noinit_itable"},
df981d03 1215 {Opt_max_dir_size_kb, "max_dir_size_kb=%u"},
c7198b9c
TT		 1216 {Opt_removed, "check=none"}, /* mount option from ext2/3 */
1217 {Opt_removed, "nocheck"}, /* mount option from ext2/3 */
1218 {Opt_removed, "reservation"}, /* mount option from ext2/3 */
1219 {Opt_removed, "noreservation"}, /* mount option from ext2/3 */
1220 {Opt_removed, "journal=%u"}, /* mount option from ext2/3 */
f3f12faa 1221 {Opt_err, NULL},
ac27a0ec
DK		 1222};
1223
617ba13b 1224static ext4_fsblk_t get_sb_block(void **data)
ac27a0ec 1225{
617ba13b 1226 ext4_fsblk_t sb_block;
ac27a0ec
DK		 1227 char *options = (char *) *data;
1228
1229 if (!options || strncmp(options, "sb=", 3) != 0)
1230 return 1; /* Default location */
0b8e58a1 1231
ac27a0ec 1232 options += 3;
0b8e58a1 1233 /* TODO: use simple_strtoll with >32bit ext4 */
ac27a0ec
DK		 1234 sb_block = simple_strtoul(options, &options, 0);
1235 if (*options && *options != ',') {
4776004f 1236 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
ac27a0ec
DK		 1237 (char *) *data);
1238 return 1;
1239 }
1240 if (*options == ',')
1241 options++;
1242 *data = (void *) options;
0b8e58a1 1243
ac27a0ec
DK		 1244 return sb_block;
1245}
1246
b3881f74 1247#define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
437ca0fd
DM		 1248static char deprecated_msg[] = "Mount option \"%s\" will be removed by %s\n"
1249 "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
b3881f74 1250
56c50f11
DM		 1251#ifdef CONFIG_QUOTA
1252static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
1253{
1254 struct ext4_sb_info *sbi = EXT4_SB(sb);
1255 char *qname;
03dafb5f 1256 int ret = -1;
56c50f11
DM		 1257
1258 if (sb_any_quota_loaded(sb) &&
1259 !sbi->s_qf_names[qtype]) {
1260 ext4_msg(sb, KERN_ERR,
1261 "Cannot change journaled "
1262 "quota options when quota turned on");
57f73c2c 1263 return -1;
56c50f11 1264 }
262b4662
JK		 1265 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA)) {
1266 ext4_msg(sb, KERN_ERR, "Cannot set journaled quota options "
1267 "when QUOTA feature is enabled");
1268 return -1;
1269 }
56c50f11
DM		 1270 qname = match_strdup(args);
1271 if (!qname) {
1272 ext4_msg(sb, KERN_ERR,
1273 "Not enough memory for storing quotafile name");
57f73c2c 1274 return -1;
56c50f11 1275 }
03dafb5f
CG		 1276 if (sbi->s_qf_names[qtype]) {
1277 if (strcmp(sbi->s_qf_names[qtype], qname) == 0)
1278 ret = 1;
1279 else
1280 ext4_msg(sb, KERN_ERR,
1281 "%s quota file already specified",
1282 QTYPE2NAME(qtype));
1283 goto errout;
56c50f11 1284 }
03dafb5f 1285 if (strchr(qname, '/')) {
56c50f11
DM		 1286 ext4_msg(sb, KERN_ERR,
1287 "quotafile must be on filesystem root");
03dafb5f 1288 goto errout;
56c50f11 1289 }
03dafb5f 1290 sbi->s_qf_names[qtype] = qname;
fd8c37ec 1291 set_opt(sb, QUOTA);
56c50f11 1292 return 1;
03dafb5f
CG		 1293errout:
1294 kfree(qname);
1295 return ret;
56c50f11
DM		 1296}
1297
1298static int clear_qf_name(struct super_block *sb, int qtype)
1299{
1300
1301 struct ext4_sb_info *sbi = EXT4_SB(sb);
1302
1303 if (sb_any_quota_loaded(sb) &&
1304 sbi->s_qf_names[qtype]) {
1305 ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options"
1306 " when quota turned on");
57f73c2c 1307 return -1;
56c50f11 1308 }
03dafb5f 1309 kfree(sbi->s_qf_names[qtype]);
56c50f11
DM		 1310 sbi->s_qf_names[qtype] = NULL;
1311 return 1;
1312}
1313#endif
1314
26092bf5
TT		 1315#define MOPT_SET 0x0001
1316#define MOPT_CLEAR 0x0002
1317#define MOPT_NOSUPPORT 0x0004
1318#define MOPT_EXPLICIT 0x0008
1319#define MOPT_CLEAR_ERR 0x0010
1320#define MOPT_GTE0 0x0020
ac27a0ec 1321#ifdef CONFIG_QUOTA
26092bf5
TT		 1322#define MOPT_Q 0
1323#define MOPT_QFMT 0x0040
1324#else
1325#define MOPT_Q MOPT_NOSUPPORT
1326#define MOPT_QFMT MOPT_NOSUPPORT
ac27a0ec 1327#endif
26092bf5 1328#define MOPT_DATAJ 0x0080
8dc0aa8c
TT		 1329#define MOPT_NO_EXT2 0x0100
1330#define MOPT_NO_EXT3 0x0200
1331#define MOPT_EXT4_ONLY (MOPT_NO_EXT2 | MOPT_NO_EXT3)
ad4eec61 1332#define MOPT_STRING 0x0400
26092bf5
TT		 1333
1334static const struct mount_opts {
1335 int token;
1336 int mount_opt;
1337 int flags;
1338} ext4_mount_opts[] = {
1339 {Opt_minix_df, EXT4_MOUNT_MINIX_DF, MOPT_SET},
1340 {Opt_bsd_df, EXT4_MOUNT_MINIX_DF, MOPT_CLEAR},
1341 {Opt_grpid, EXT4_MOUNT_GRPID, MOPT_SET},
1342 {Opt_nogrpid, EXT4_MOUNT_GRPID, MOPT_CLEAR},
26092bf5
TT		 1343 {Opt_block_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_SET},
1344 {Opt_noblock_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_CLEAR},
8dc0aa8c
TT		 1345 {Opt_dioread_nolock, EXT4_MOUNT_DIOREAD_NOLOCK,
1346 MOPT_EXT4_ONLY | MOPT_SET},
1347 {Opt_dioread_lock, EXT4_MOUNT_DIOREAD_NOLOCK,
1348 MOPT_EXT4_ONLY | MOPT_CLEAR},
26092bf5
TT		 1349 {Opt_discard, EXT4_MOUNT_DISCARD, MOPT_SET},
1350 {Opt_nodiscard, EXT4_MOUNT_DISCARD, MOPT_CLEAR},
8dc0aa8c
TT		 1351 {Opt_delalloc, EXT4_MOUNT_DELALLOC,
1352 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
1353 {Opt_nodelalloc, EXT4_MOUNT_DELALLOC,
59d9fa5c 1354 MOPT_EXT4_ONLY | MOPT_CLEAR},
c6d3d56d
DW		 1355 {Opt_nojournal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
1356 MOPT_EXT4_ONLY | MOPT_CLEAR},
8dc0aa8c
TT		 1357 {Opt_journal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
1358 MOPT_EXT4_ONLY | MOPT_SET},
26092bf5 1359 {Opt_journal_async_commit, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT |
8dc0aa8c
TT		 1360 EXT4_MOUNT_JOURNAL_CHECKSUM),
1361 MOPT_EXT4_ONLY | MOPT_SET},
1362 {Opt_noload, EXT4_MOUNT_NOLOAD, MOPT_NO_EXT2 | MOPT_SET},
26092bf5
TT		 1363 {Opt_err_panic, EXT4_MOUNT_ERRORS_PANIC, MOPT_SET | MOPT_CLEAR_ERR},
1364 {Opt_err_ro, EXT4_MOUNT_ERRORS_RO, MOPT_SET | MOPT_CLEAR_ERR},
1365 {Opt_err_cont, EXT4_MOUNT_ERRORS_CONT, MOPT_SET | MOPT_CLEAR_ERR},
8dc0aa8c
TT		 1366 {Opt_data_err_abort, EXT4_MOUNT_DATA_ERR_ABORT,
1367 MOPT_NO_EXT2 | MOPT_SET},
1368 {Opt_data_err_ignore, EXT4_MOUNT_DATA_ERR_ABORT,
1369 MOPT_NO_EXT2 | MOPT_CLEAR},
26092bf5
TT		 1370 {Opt_barrier, EXT4_MOUNT_BARRIER, MOPT_SET},
1371 {Opt_nobarrier, EXT4_MOUNT_BARRIER, MOPT_CLEAR},
1372 {Opt_noauto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_SET},
1373 {Opt_auto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_CLEAR},
1374 {Opt_noinit_itable, EXT4_MOUNT_INIT_INODE_TABLE, MOPT_CLEAR},
1375 {Opt_commit, 0, MOPT_GTE0},
1376 {Opt_max_batch_time, 0, MOPT_GTE0},
1377 {Opt_min_batch_time, 0, MOPT_GTE0},
1378 {Opt_inode_readahead_blks, 0, MOPT_GTE0},
1379 {Opt_init_itable, 0, MOPT_GTE0},
1380 {Opt_stripe, 0, MOPT_GTE0},
0efb3b23
JK		 1381 {Opt_resuid, 0, MOPT_GTE0},
1382 {Opt_resgid, 0, MOPT_GTE0},
1383 {Opt_journal_dev, 0, MOPT_GTE0},
ad4eec61 1384 {Opt_journal_path, 0, MOPT_STRING},
0efb3b23 1385 {Opt_journal_ioprio, 0, MOPT_GTE0},
8dc0aa8c
TT		 1386 {Opt_data_journal, EXT4_MOUNT_JOURNAL_DATA, MOPT_NO_EXT2 | MOPT_DATAJ},
1387 {Opt_data_ordered, EXT4_MOUNT_ORDERED_DATA, MOPT_NO_EXT2 | MOPT_DATAJ},
1388 {Opt_data_writeback, EXT4_MOUNT_WRITEBACK_DATA,
1389 MOPT_NO_EXT2 | MOPT_DATAJ},
26092bf5
TT		 1390 {Opt_user_xattr, EXT4_MOUNT_XATTR_USER, MOPT_SET},
1391 {Opt_nouser_xattr, EXT4_MOUNT_XATTR_USER, MOPT_CLEAR},
03010a33 1392#ifdef CONFIG_EXT4_FS_POSIX_ACL
26092bf5
TT		 1393 {Opt_acl, EXT4_MOUNT_POSIX_ACL, MOPT_SET},
1394 {Opt_noacl, EXT4_MOUNT_POSIX_ACL, MOPT_CLEAR},
ac27a0ec 1395#else
26092bf5
TT		 1396 {Opt_acl, 0, MOPT_NOSUPPORT},
1397 {Opt_noacl, 0, MOPT_NOSUPPORT},
ac27a0ec 1398#endif
26092bf5
TT		 1399 {Opt_nouid32, EXT4_MOUNT_NO_UID32, MOPT_SET},
1400 {Opt_debug, EXT4_MOUNT_DEBUG, MOPT_SET},
1401 {Opt_quota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA, MOPT_SET | MOPT_Q},
1402 {Opt_usrquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA,
1403 MOPT_SET | MOPT_Q},
1404 {Opt_grpquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_GRPQUOTA,
1405 MOPT_SET | MOPT_Q},
1406 {Opt_noquota, (EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA |
1407 EXT4_MOUNT_GRPQUOTA), MOPT_CLEAR | MOPT_Q},
1408 {Opt_usrjquota, 0, MOPT_Q},
1409 {Opt_grpjquota, 0, MOPT_Q},
1410 {Opt_offusrjquota, 0, MOPT_Q},
1411 {Opt_offgrpjquota, 0, MOPT_Q},
1412 {Opt_jqfmt_vfsold, QFMT_VFS_OLD, MOPT_QFMT},
1413 {Opt_jqfmt_vfsv0, QFMT_VFS_V0, MOPT_QFMT},
1414 {Opt_jqfmt_vfsv1, QFMT_VFS_V1, MOPT_QFMT},
df981d03 1415 {Opt_max_dir_size_kb, 0, MOPT_GTE0},
26092bf5
TT		 1416 {Opt_err, 0, 0}
1417};
1418
1419static int handle_mount_opt(struct super_block *sb, char *opt, int token,
1420 substring_t *args, unsigned long *journal_devnum,
1421 unsigned int *journal_ioprio, int is_remount)
1422{
1423 struct ext4_sb_info *sbi = EXT4_SB(sb);
1424 const struct mount_opts *m;
08cefc7a
EB		 1425 kuid_t uid;
1426 kgid_t gid;
26092bf5
TT		 1427 int arg = 0;
1428
57f73c2c
TT		 1429#ifdef CONFIG_QUOTA
1430 if (token == Opt_usrjquota)
1431 return set_qf_name(sb, USRQUOTA, &args[0]);
1432 else if (token == Opt_grpjquota)
1433 return set_qf_name(sb, GRPQUOTA, &args[0]);
1434 else if (token == Opt_offusrjquota)
1435 return clear_qf_name(sb, USRQUOTA);
1436 else if (token == Opt_offgrpjquota)
1437 return clear_qf_name(sb, GRPQUOTA);
1438#endif
26092bf5 1439 switch (token) {
f7048605
TT		 1440 case Opt_noacl:
1441 case Opt_nouser_xattr:
1442 ext4_msg(sb, KERN_WARNING, deprecated_msg, opt, "3.5");
1443 break;
26092bf5
TT		 1444 case Opt_sb:
1445 return 1; /* handled by get_sb_block() */
1446 case Opt_removed:
5f3633e3 1447 ext4_msg(sb, KERN_WARNING, "Ignoring removed %s option", opt);
26092bf5 1448 return 1;
26092bf5
TT		 1449 case Opt_abort:
1450 sbi->s_mount_flags |= EXT4_MF_FS_ABORTED;
1451 return 1;
1452 case Opt_i_version:
1453 sb->s_flags |= MS_I_VERSION;
1454 return 1;
26092bf5
TT		 1455 }
1456
5f3633e3
JK		 1457 for (m = ext4_mount_opts; m->token != Opt_err; m++)
1458 if (token == m->token)
1459 break;
1460
1461 if (m->token == Opt_err) {
1462 ext4_msg(sb, KERN_ERR, "Unrecognized mount option \"%s\" "
1463 "or missing value", opt);
1464 return -1;
1465 }
1466
8dc0aa8c
TT		 1467 if ((m->flags & MOPT_NO_EXT2) && IS_EXT2_SB(sb)) {
1468 ext4_msg(sb, KERN_ERR,
1469 "Mount option \"%s\" incompatible with ext2", opt);
1470 return -1;
1471 }
1472 if ((m->flags & MOPT_NO_EXT3) && IS_EXT3_SB(sb)) {
1473 ext4_msg(sb, KERN_ERR,
1474 "Mount option \"%s\" incompatible with ext3", opt);
1475 return -1;
1476 }
1477
ad4eec61 1478 if (args->from && !(m->flags & MOPT_STRING) && match_int(args, &arg))
5f3633e3
JK		 1479 return -1;
1480 if (args->from && (m->flags & MOPT_GTE0) && (arg < 0))
1481 return -1;
1482 if (m->flags & MOPT_EXPLICIT)
1483 set_opt2(sb, EXPLICIT_DELALLOC);
1484 if (m->flags & MOPT_CLEAR_ERR)
1485 clear_opt(sb, ERRORS_MASK);
1486 if (token == Opt_noquota && sb_any_quota_loaded(sb)) {
1487 ext4_msg(sb, KERN_ERR, "Cannot change quota "
1488 "options when quota turned on");
1489 return -1;
1490 }
1491
1492 if (m->flags & MOPT_NOSUPPORT) {
1493 ext4_msg(sb, KERN_ERR, "%s option not supported", opt);
1494 } else if (token == Opt_commit) {
1495 if (arg == 0)
1496 arg = JBD2_DEFAULT_MAX_COMMIT_AGE;
1497 sbi->s_commit_interval = HZ * arg;
1498 } else if (token == Opt_max_batch_time) {
5f3633e3
JK		 1499 sbi->s_max_batch_time = arg;
1500 } else if (token == Opt_min_batch_time) {
1501 sbi->s_min_batch_time = arg;
1502 } else if (token == Opt_inode_readahead_blks) {
e33e60ea
JK		 1503 if (arg && (arg > (1 << 30) || !is_power_of_2(arg))) {
1504 ext4_msg(sb, KERN_ERR,
1505 "EXT4-fs: inode_readahead_blks must be "
1506 "0 or a power of 2 smaller than 2^31");
26092bf5 1507 return -1;
5f3633e3
JK		 1508 }
1509 sbi->s_inode_readahead_blks = arg;
1510 } else if (token == Opt_init_itable) {
1511 set_opt(sb, INIT_INODE_TABLE);
1512 if (!args->from)
1513 arg = EXT4_DEF_LI_WAIT_MULT;
1514 sbi->s_li_wait_mult = arg;
1515 } else if (token == Opt_max_dir_size_kb) {
1516 sbi->s_max_dir_size_kb = arg;
1517 } else if (token == Opt_stripe) {
1518 sbi->s_stripe = arg;
1519 } else if (token == Opt_resuid) {
1520 uid = make_kuid(current_user_ns(), arg);
1521 if (!uid_valid(uid)) {
1522 ext4_msg(sb, KERN_ERR, "Invalid uid value %d", arg);
26092bf5
TT		 1523 return -1;
1524 }
5f3633e3
JK		 1525 sbi->s_resuid = uid;
1526 } else if (token == Opt_resgid) {
1527 gid = make_kgid(current_user_ns(), arg);
1528 if (!gid_valid(gid)) {
1529 ext4_msg(sb, KERN_ERR, "Invalid gid value %d", arg);
1530 return -1;
1531 }
1532 sbi->s_resgid = gid;
1533 } else if (token == Opt_journal_dev) {
1534 if (is_remount) {
1535 ext4_msg(sb, KERN_ERR,
1536 "Cannot specify journal on remount");
1537 return -1;
1538 }
1539 *journal_devnum = arg;
ad4eec61
ES		 1540 } else if (token == Opt_journal_path) {
1541 char *journal_path;
1542 struct inode *journal_inode;
1543 struct path path;
1544 int error;
1545
1546 if (is_remount) {
1547 ext4_msg(sb, KERN_ERR,
1548 "Cannot specify journal on remount");
1549 return -1;
1550 }
1551 journal_path = match_strdup(&args[0]);
1552 if (!journal_path) {
1553 ext4_msg(sb, KERN_ERR, "error: could not dup "
1554 "journal device string");
1555 return -1;
1556 }
1557
1558 error = kern_path(journal_path, LOOKUP_FOLLOW, &path);
1559 if (error) {
1560 ext4_msg(sb, KERN_ERR, "error: could not find "
1561 "journal device path: error %d", error);
1562 kfree(journal_path);
1563 return -1;
1564 }
1565
1566 journal_inode = path.dentry->d_inode;
1567 if (!S_ISBLK(journal_inode->i_mode)) {
1568 ext4_msg(sb, KERN_ERR, "error: journal path %s "
1569 "is not a block device", journal_path);
1570 path_put(&path);
1571 kfree(journal_path);
1572 return -1;
1573 }
1574
1575 *journal_devnum = new_encode_dev(journal_inode->i_rdev);
1576 path_put(&path);
1577 kfree(journal_path);
5f3633e3
JK		 1578 } else if (token == Opt_journal_ioprio) {
1579 if (arg > 7) {
1580 ext4_msg(sb, KERN_ERR, "Invalid journal IO priority"
1581 " (must be 0-7)");
1582 return -1;
1583 }
1584 *journal_ioprio =
1585 IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, arg);
1586 } else if (m->flags & MOPT_DATAJ) {
1587 if (is_remount) {
1588 if (!sbi->s_journal)
1589 ext4_msg(sb, KERN_WARNING, "Remounting file system with no journal so ignoring journalled data option");
1590 else if (test_opt(sb, DATA_FLAGS) != m->mount_opt) {
0efb3b23 1591 ext4_msg(sb, KERN_ERR,
26092bf5 1592 "Cannot change data mode on remount");
26092bf5 1593 return -1;
ac27a0ec 1594 }
26092bf5 1595 } else {
5f3633e3
JK		 1596 clear_opt(sb, DATA_FLAGS);
1597 sbi->s_mount_opt |= m->mount_opt;
ac27a0ec 1598 }
5f3633e3
JK		 1599#ifdef CONFIG_QUOTA
1600 } else if (m->flags & MOPT_QFMT) {
1601 if (sb_any_quota_loaded(sb) &&
1602 sbi->s_jquota_fmt != m->mount_opt) {
1603 ext4_msg(sb, KERN_ERR, "Cannot change journaled "
1604 "quota options when quota turned on");
1605 return -1;
1606 }
262b4662
JK		 1607 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
1608 EXT4_FEATURE_RO_COMPAT_QUOTA)) {
1609 ext4_msg(sb, KERN_ERR,
1610 "Cannot set journaled quota options "
1611 "when QUOTA feature is enabled");
1612 return -1;
1613 }
5f3633e3
JK		 1614 sbi->s_jquota_fmt = m->mount_opt;
1615#endif
1616 } else {
1617 if (!args->from)
1618 arg = 1;
1619 if (m->flags & MOPT_CLEAR)
1620 arg = !arg;
1621 else if (unlikely(!(m->flags & MOPT_SET))) {
1622 ext4_msg(sb, KERN_WARNING,
1623 "buggy handling of option %s", opt);
1624 WARN_ON(1);
1625 return -1;
1626 }
1627 if (arg != 0)
1628 sbi->s_mount_opt |= m->mount_opt;
1629 else
1630 sbi->s_mount_opt &= ~m->mount_opt;
26092bf5 1631 }
5f3633e3 1632 return 1;
26092bf5
TT		 1633}
1634
1635static int parse_options(char *options, struct super_block *sb,
1636 unsigned long *journal_devnum,
1637 unsigned int *journal_ioprio,
1638 int is_remount)
1639{
1640 struct ext4_sb_info *sbi = EXT4_SB(sb);
1641 char *p;
1642 substring_t args[MAX_OPT_ARGS];
1643 int token;
1644
1645 if (!options)
1646 return 1;
1647
1648 while ((p = strsep(&options, ",")) != NULL) {
1649 if (!*p)
1650 continue;
1651 /*
1652 * Initialize args struct so we know whether arg was
1653 * found; some options take optional arguments.
1654 */
caecd0af 1655 args[0].to = args[0].from = NULL;
26092bf5
TT		 1656 token = match_token(p, tokens, args);
1657 if (handle_mount_opt(sb, p, token, args, journal_devnum,
1658 journal_ioprio, is_remount) < 0)
1659 return 0;
ac27a0ec
DK		 1660 }
1661#ifdef CONFIG_QUOTA
262b4662
JK		 1662 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) &&
1663 (test_opt(sb, USRQUOTA) || test_opt(sb, GRPQUOTA))) {
1664 ext4_msg(sb, KERN_ERR, "Cannot set quota options when QUOTA "
1665 "feature is enabled");
1666 return 0;
1667 }
ac27a0ec 1668 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
482a7425 1669 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
fd8c37ec 1670 clear_opt(sb, USRQUOTA);
ac27a0ec 1671
482a7425 1672 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
fd8c37ec 1673 clear_opt(sb, GRPQUOTA);
ac27a0ec 1674
56c50f11 1675 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
b31e1552
ES		 1676 ext4_msg(sb, KERN_ERR, "old and new quota "
1677 "format mixing");
ac27a0ec
DK		 1678 return 0;
1679 }
1680
1681 if (!sbi->s_jquota_fmt) {
b31e1552
ES		 1682 ext4_msg(sb, KERN_ERR, "journaled quota format "
1683 "not specified");
ac27a0ec
DK		 1684 return 0;
1685 }
ac27a0ec
DK		 1686 }
1687#endif
261cb20c
JK		 1688 if (test_opt(sb, DIOREAD_NOLOCK)) {
1689 int blocksize =
1690 BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);
1691
1692 if (blocksize < PAGE_CACHE_SIZE) {
1693 ext4_msg(sb, KERN_ERR, "can't mount with "
1694 "dioread_nolock if block size != PAGE_SIZE");
1695 return 0;
1696 }
1697 }
d4f76107
JK		 1698 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA &&
1699 test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
1700 ext4_msg(sb, KERN_ERR, "can't mount with journal_async_commit "
1701 "in data=ordered mode");
1702 return 0;
1703 }
ac27a0ec
DK		 1704 return 1;
1705}
1706
2adf6da8
TT		 1707static inline void ext4_show_quota_options(struct seq_file *seq,
1708 struct super_block *sb)
1709{
1710#if defined(CONFIG_QUOTA)
1711 struct ext4_sb_info *sbi = EXT4_SB(sb);
1712
1713 if (sbi->s_jquota_fmt) {
1714 char *fmtname = "";
1715
1716 switch (sbi->s_jquota_fmt) {
1717 case QFMT_VFS_OLD:
1718 fmtname = "vfsold";
1719 break;
1720 case QFMT_VFS_V0:
1721 fmtname = "vfsv0";
1722 break;
1723 case QFMT_VFS_V1:
1724 fmtname = "vfsv1";
1725 break;
1726 }
1727 seq_printf(seq, ",jqfmt=%s", fmtname);
1728 }
1729
1730 if (sbi->s_qf_names[USRQUOTA])
1731 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
1732
1733 if (sbi->s_qf_names[GRPQUOTA])
1734 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
2adf6da8
TT		 1735#endif
1736}
1737
5a916be1
TT		 1738static const char *token2str(int token)
1739{
50df9fd5 1740 const struct match_token *t;
5a916be1
TT		 1741
1742 for (t = tokens; t->token != Opt_err; t++)
1743 if (t->token == token && !strchr(t->pattern, '='))
1744 break;
1745 return t->pattern;
1746}
1747
2adf6da8
TT		 1748/*
1749 * Show an option if
1750 * - it's set to a non-default value OR
1751 * - if the per-sb default is different from the global default
1752 */
66acdcf4
TT		 1753static int _ext4_show_options(struct seq_file *seq, struct super_block *sb,
1754 int nodefs)
2adf6da8 1755{
2adf6da8
TT		 1756 struct ext4_sb_info *sbi = EXT4_SB(sb);
1757 struct ext4_super_block *es = sbi->s_es;
66acdcf4 1758 int def_errors, def_mount_opt = nodefs ? 0 : sbi->s_def_mount_opt;
5a916be1 1759 const struct mount_opts *m;
66acdcf4 1760 char sep = nodefs ? '\n' : ',';
2adf6da8 1761
66acdcf4
TT		 1762#define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep)
1763#define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg)
2adf6da8
TT		 1764
1765 if (sbi->s_sb_block != 1)
5a916be1
TT		 1766 SEQ_OPTS_PRINT("sb=%llu", sbi->s_sb_block);
1767
1768 for (m = ext4_mount_opts; m->token != Opt_err; m++) {
1769 int want_set = m->flags & MOPT_SET;
1770 if (((m->flags & (MOPT_SET|MOPT_CLEAR)) == 0) ||
1771 (m->flags & MOPT_CLEAR_ERR))
1772 continue;
66acdcf4 1773 if (!(m->mount_opt & (sbi->s_mount_opt ^ def_mount_opt)))
5a916be1
TT		 1774 continue; /* skip if same as the default */
1775 if ((want_set &&
1776 (sbi->s_mount_opt & m->mount_opt) != m->mount_opt) ||
1777 (!want_set && (sbi->s_mount_opt & m->mount_opt)))
1778 continue; /* select Opt_noFoo vs Opt_Foo */
1779 SEQ_OPTS_PRINT("%s", token2str(m->token));
2adf6da8 1780 }
5a916be1 1781
08cefc7a 1782 if (nodefs || !uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT4_DEF_RESUID)) ||
5a916be1 1783 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID)
08cefc7a
EB		 1784 SEQ_OPTS_PRINT("resuid=%u",
1785 from_kuid_munged(&init_user_ns, sbi->s_resuid));
1786 if (nodefs || !gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT4_DEF_RESGID)) ||
5a916be1 1787 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID)
08cefc7a
EB		 1788 SEQ_OPTS_PRINT("resgid=%u",
1789 from_kgid_munged(&init_user_ns, sbi->s_resgid));
66acdcf4 1790 def_errors = nodefs ? -1 : le16_to_cpu(es->s_errors);
5a916be1
TT		 1791 if (test_opt(sb, ERRORS_RO) && def_errors != EXT4_ERRORS_RO)
1792 SEQ_OPTS_PUTS("errors=remount-ro");
2adf6da8 1793 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
5a916be1 1794 SEQ_OPTS_PUTS("errors=continue");
2adf6da8 1795 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
5a916be1 1796 SEQ_OPTS_PUTS("errors=panic");
66acdcf4 1797 if (nodefs || sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ)
5a916be1 1798 SEQ_OPTS_PRINT("commit=%lu", sbi->s_commit_interval / HZ);
66acdcf4 1799 if (nodefs || sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME)
5a916be1 1800 SEQ_OPTS_PRINT("min_batch_time=%u", sbi->s_min_batch_time);
66acdcf4 1801 if (nodefs || sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME)
5a916be1 1802 SEQ_OPTS_PRINT("max_batch_time=%u", sbi->s_max_batch_time);
2adf6da8 1803 if (sb->s_flags & MS_I_VERSION)
5a916be1 1804 SEQ_OPTS_PUTS("i_version");
66acdcf4 1805 if (nodefs || sbi->s_stripe)
5a916be1 1806 SEQ_OPTS_PRINT("stripe=%lu", sbi->s_stripe);
66acdcf4 1807 if (EXT4_MOUNT_DATA_FLAGS & (sbi->s_mount_opt ^ def_mount_opt)) {
5a916be1
TT		 1808 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
1809 SEQ_OPTS_PUTS("data=journal");
1810 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
1811 SEQ_OPTS_PUTS("data=ordered");
1812 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
1813 SEQ_OPTS_PUTS("data=writeback");
1814 }
66acdcf4
TT		 1815 if (nodefs ||
1816 sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
5a916be1
TT		 1817 SEQ_OPTS_PRINT("inode_readahead_blks=%u",
1818 sbi->s_inode_readahead_blks);
2adf6da8 1819
66acdcf4
TT		 1820 if (nodefs || (test_opt(sb, INIT_INODE_TABLE) &&
1821 (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT)))
5a916be1 1822 SEQ_OPTS_PRINT("init_itable=%u", sbi->s_li_wait_mult);
df981d03
TT		 1823 if (nodefs || sbi->s_max_dir_size_kb)
1824 SEQ_OPTS_PRINT("max_dir_size_kb=%u", sbi->s_max_dir_size_kb);
2adf6da8
TT		 1825
1826 ext4_show_quota_options(seq, sb);
2adf6da8
TT		 1827 return 0;
1828}
1829
66acdcf4
TT		 1830static int ext4_show_options(struct seq_file *seq, struct dentry *root)
1831{
1832 return _ext4_show_options(seq, root->d_sb, 0);
1833}
1834
1835static int options_seq_show(struct seq_file *seq, void *offset)
1836{
1837 struct super_block *sb = seq->private;
1838 int rc;
1839
1840 seq_puts(seq, (sb->s_flags & MS_RDONLY) ? "ro" : "rw");
1841 rc = _ext4_show_options(seq, sb, 1);
1842 seq_puts(seq, "\n");
1843 return rc;
1844}
1845
1846static int options_open_fs(struct inode *inode, struct file *file)
1847{
d9dda78b 1848 return single_open(file, options_seq_show, PDE_DATA(inode));
66acdcf4
TT		 1849}
1850
1851static const struct file_operations ext4_seq_options_fops = {
1852 .owner = THIS_MODULE,
1853 .open = options_open_fs,
1854 .read = seq_read,
1855 .llseek = seq_lseek,
1856 .release = single_release,
1857};
1858
617ba13b 1859static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
ac27a0ec
DK		 1860 int read_only)
1861{
617ba13b 1862 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec
DK		 1863 int res = 0;
1864
617ba13b 1865 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
b31e1552
ES		 1866 ext4_msg(sb, KERN_ERR, "revision level too high, "
1867 "forcing read-only mode");
ac27a0ec
DK		 1868 res = MS_RDONLY;
1869 }
1870 if (read_only)
281b5995 1871 goto done;
617ba13b 1872 if (!(sbi->s_mount_state & EXT4_VALID_FS))
b31e1552
ES		 1873 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
1874 "running e2fsck is recommended");
c8b459f4 1875 else if (sbi->s_mount_state & EXT4_ERROR_FS)
b31e1552
ES		 1876 ext4_msg(sb, KERN_WARNING,
1877 "warning: mounting fs with errors, "
1878 "running e2fsck is recommended");
ed3ce80a 1879 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
ac27a0ec
DK		 1880 le16_to_cpu(es->s_mnt_count) >=
1881 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
b31e1552
ES		 1882 ext4_msg(sb, KERN_WARNING,
1883 "warning: maximal mount count reached, "
1884 "running e2fsck is recommended");
ac27a0ec
DK		 1885 else if (le32_to_cpu(es->s_checkinterval) &&
1886 (le32_to_cpu(es->s_lastcheck) +
1887 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
b31e1552
ES		 1888 ext4_msg(sb, KERN_WARNING,
1889 "warning: checktime reached, "
1890 "running e2fsck is recommended");
0b8e58a1 1891 if (!sbi->s_journal)
0390131b 1892 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
ac27a0ec 1893 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
617ba13b 1894 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
e8546d06 1895 le16_add_cpu(&es->s_mnt_count, 1);
ac27a0ec 1896 es->s_mtime = cpu_to_le32(get_seconds());
617ba13b 1897 ext4_update_dynamic_rev(sb);
0390131b
FM		 1898 if (sbi->s_journal)
1899 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
ac27a0ec 1900
e2d67052 1901 ext4_commit_super(sb, 1);
281b5995 1902done:
ac27a0ec 1903 if (test_opt(sb, DEBUG))
a9df9a49 1904 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
a2595b8a 1905 "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
ac27a0ec
DK		 1906 sb->s_blocksize,
1907 sbi->s_groups_count,
617ba13b
MC		 1908 EXT4_BLOCKS_PER_GROUP(sb),
1909 EXT4_INODES_PER_GROUP(sb),
a2595b8a 1910 sbi->s_mount_opt, sbi->s_mount_opt2);
ac27a0ec 1911
7abc52c2 1912 cleancache_init_fs(sb);
ac27a0ec
DK		 1913 return res;
1914}
1915
117fff10
TT		 1916int ext4_alloc_flex_bg_array(struct super_block *sb, ext4_group_t ngroup)
1917{
1918 struct ext4_sb_info *sbi = EXT4_SB(sb);
1919 struct flex_groups *new_groups;
1920 int size;
1921
1922 if (!sbi->s_log_groups_per_flex)
1923 return 0;
1924
1925 size = ext4_flex_group(sbi, ngroup - 1) + 1;
1926 if (size <= sbi->s_flex_groups_allocated)
1927 return 0;
1928
1929 size = roundup_pow_of_two(size * sizeof(struct flex_groups));
1930 new_groups = ext4_kvzalloc(size, GFP_KERNEL);
1931 if (!new_groups) {
1932 ext4_msg(sb, KERN_ERR, "not enough memory for %d flex groups",
1933 size / (int) sizeof(struct flex_groups));
1934 return -ENOMEM;
1935 }
1936
1937 if (sbi->s_flex_groups) {
1938 memcpy(new_groups, sbi->s_flex_groups,
1939 (sbi->s_flex_groups_allocated *
1940 sizeof(struct flex_groups)));
b93b41d4 1941 kvfree(sbi->s_flex_groups);
117fff10
TT		 1942 }
1943 sbi->s_flex_groups = new_groups;
1944 sbi->s_flex_groups_allocated = size / sizeof(struct flex_groups);
1945 return 0;
1946}
1947
772cb7c8
JS		 1948static int ext4_fill_flex_info(struct super_block *sb)
1949{
1950 struct ext4_sb_info *sbi = EXT4_SB(sb);
1951 struct ext4_group_desc *gdp = NULL;
772cb7c8 1952 ext4_group_t flex_group;
117fff10 1953 int i, err;
772cb7c8 1954
503358ae 1955 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
d50f2ab6 1956 if (sbi->s_log_groups_per_flex < 1 || sbi->s_log_groups_per_flex > 31) {
772cb7c8
JS		 1957 sbi->s_log_groups_per_flex = 0;
1958 return 1;
1959 }
1960
117fff10
TT		 1961 err = ext4_alloc_flex_bg_array(sb, sbi->s_groups_count);
1962 if (err)
9933fc0a 1963 goto failed;
772cb7c8 1964
772cb7c8 1965 for (i = 0; i < sbi->s_groups_count; i++) {
88b6edd1 1966 gdp = ext4_get_group_desc(sb, i, NULL);
772cb7c8
JS		 1967
1968 flex_group = ext4_flex_group(sbi, i);
7ad9bb65
TT		 1969 atomic_add(ext4_free_inodes_count(sb, gdp),
1970 &sbi->s_flex_groups[flex_group].free_inodes);
90ba983f
TT		 1971 atomic64_add(ext4_free_group_clusters(sb, gdp),
1972 &sbi->s_flex_groups[flex_group].free_clusters);
7ad9bb65
TT		 1973 atomic_add(ext4_used_dirs_count(sb, gdp),
1974 &sbi->s_flex_groups[flex_group].used_dirs);
772cb7c8
JS		 1975 }
1976
1977 return 1;
1978failed:
1979 return 0;
1980}
1981
feb0ab32
DW		 1982static __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
1983 struct ext4_group_desc *gdp)
717d50e4 1984{
feb0ab32 1985 int offset;
717d50e4 1986 __u16 crc = 0;
feb0ab32 1987 __le32 le_group = cpu_to_le32(block_group);
717d50e4 1988
9aa5d32b 1989 if (ext4_has_metadata_csum(sbi->s_sb)) {
feb0ab32 1990 /* Use new metadata_csum algorithm */
d6a77105 1991 __le16 save_csum;
feb0ab32
DW		 1992 __u32 csum32;
1993
d6a77105 1994 save_csum = gdp->bg_checksum;
feb0ab32
DW		 1995 gdp->bg_checksum = 0;
1996 csum32 = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&le_group,
1997 sizeof(le_group));
1998 csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp,
1999 sbi->s_desc_size);
d6a77105 2000 gdp->bg_checksum = save_csum;
feb0ab32
DW		 2001
2002 crc = csum32 & 0xFFFF;
2003 goto out;
717d50e4
AD		 2004 }
2005
feb0ab32 2006 /* old crc16 code */
813d32f9
DW		 2007 if (!(sbi->s_es->s_feature_ro_compat &
2008 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)))
2009 return 0;
2010
feb0ab32
DW		 2011 offset = offsetof(struct ext4_group_desc, bg_checksum);
2012
2013 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
2014 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
2015 crc = crc16(crc, (__u8 *)gdp, offset);
2016 offset += sizeof(gdp->bg_checksum); /* skip checksum */
2017 /* for checksum of struct ext4_group_desc do the rest...*/
2018 if ((sbi->s_es->s_feature_incompat &
2019 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) &&
2020 offset < le16_to_cpu(sbi->s_es->s_desc_size))
2021 crc = crc16(crc, (__u8 *)gdp + offset,
2022 le16_to_cpu(sbi->s_es->s_desc_size) -
2023 offset);
2024
2025out:
717d50e4
AD		 2026 return cpu_to_le16(crc);
2027}
2028
feb0ab32 2029int ext4_group_desc_csum_verify(struct super_block *sb, __u32 block_group,
717d50e4
AD		 2030 struct ext4_group_desc *gdp)
2031{
feb0ab32
DW		 2032 if (ext4_has_group_desc_csum(sb) &&
2033 (gdp->bg_checksum != ext4_group_desc_csum(EXT4_SB(sb),
2034 block_group, gdp)))
717d50e4
AD		 2035 return 0;
2036
2037 return 1;
2038}
2039
feb0ab32
DW		 2040void ext4_group_desc_csum_set(struct super_block *sb, __u32 block_group,
2041 struct ext4_group_desc *gdp)
2042{
2043 if (!ext4_has_group_desc_csum(sb))
2044 return;
2045 gdp->bg_checksum = ext4_group_desc_csum(EXT4_SB(sb), block_group, gdp);
2046}
2047
ac27a0ec 2048/* Called at mount-time, super-block is locked */
bfff6873
LC		 2049static int ext4_check_descriptors(struct super_block *sb,
2050 ext4_group_t *first_not_zeroed)
ac27a0ec 2051{
617ba13b
MC		 2052 struct ext4_sb_info *sbi = EXT4_SB(sb);
2053 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
2054 ext4_fsblk_t last_block;
bd81d8ee
LV		 2055 ext4_fsblk_t block_bitmap;
2056 ext4_fsblk_t inode_bitmap;
2057 ext4_fsblk_t inode_table;
ce421581 2058 int flexbg_flag = 0;
bfff6873 2059 ext4_group_t i, grp = sbi->s_groups_count;
ac27a0ec 2060
ce421581
JS		 2061 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
2062 flexbg_flag = 1;
2063
af5bc92d 2064 ext4_debug("Checking group descriptors");
ac27a0ec 2065
197cd65a
AM		 2066 for (i = 0; i < sbi->s_groups_count; i++) {
2067 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
2068
ce421581 2069 if (i == sbi->s_groups_count - 1 || flexbg_flag)
bd81d8ee 2070 last_block = ext4_blocks_count(sbi->s_es) - 1;
ac27a0ec
DK		 2071 else
2072 last_block = first_block +
617ba13b 2073 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
ac27a0ec 2074
bfff6873
LC		 2075 if ((grp == sbi->s_groups_count) &&
2076 !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2077 grp = i;
2078
8fadc143 2079 block_bitmap = ext4_block_bitmap(sb, gdp);
2b2d6d01 2080 if (block_bitmap < first_block || block_bitmap > last_block) {
b31e1552 2081 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2082 "Block bitmap for group %u not in group "
b31e1552 2083 "(block %llu)!", i, block_bitmap);
ac27a0ec
DK		 2084 return 0;
2085 }
8fadc143 2086 inode_bitmap = ext4_inode_bitmap(sb, gdp);
2b2d6d01 2087 if (inode_bitmap < first_block || inode_bitmap > last_block) {
b31e1552 2088 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2089 "Inode bitmap for group %u not in group "
b31e1552 2090 "(block %llu)!", i, inode_bitmap);
ac27a0ec
DK		 2091 return 0;
2092 }
8fadc143 2093 inode_table = ext4_inode_table(sb, gdp);
bd81d8ee 2094 if (inode_table < first_block ||
2b2d6d01 2095 inode_table + sbi->s_itb_per_group - 1 > last_block) {
b31e1552 2096 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2097 "Inode table for group %u not in group "
b31e1552 2098 "(block %llu)!", i, inode_table);
ac27a0ec
DK		 2099 return 0;
2100 }
955ce5f5 2101 ext4_lock_group(sb, i);
feb0ab32 2102 if (!ext4_group_desc_csum_verify(sb, i, gdp)) {
b31e1552
ES		 2103 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2104 "Checksum for group %u failed (%u!=%u)",
2105 i, le16_to_cpu(ext4_group_desc_csum(sbi, i,
2106 gdp)), le16_to_cpu(gdp->bg_checksum));
7ee1ec4c 2107 if (!(sb->s_flags & MS_RDONLY)) {
955ce5f5 2108 ext4_unlock_group(sb, i);
8a266467 2109 return 0;
7ee1ec4c 2110 }
717d50e4 2111 }
955ce5f5 2112 ext4_unlock_group(sb, i);
ce421581
JS		 2113 if (!flexbg_flag)
2114 first_block += EXT4_BLOCKS_PER_GROUP(sb);
ac27a0ec 2115 }
bfff6873
LC		 2116 if (NULL != first_not_zeroed)
2117 *first_not_zeroed = grp;
ac27a0ec
DK		 2118 return 1;
2119}
2120
617ba13b 2121/* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
ac27a0ec
DK		 2122 * the superblock) which were deleted from all directories, but held open by
2123 * a process at the time of a crash. We walk the list and try to delete these
2124 * inodes at recovery time (only with a read-write filesystem).
2125 *
2126 * In order to keep the orphan inode chain consistent during traversal (in
2127 * case of crash during recovery), we link each inode into the superblock
2128 * orphan list_head and handle it the same way as an inode deletion during
2129 * normal operation (which journals the operations for us).
2130 *
2131 * We only do an iget() and an iput() on each inode, which is very safe if we
2132 * accidentally point at an in-use or already deleted inode. The worst that
2133 * can happen in this case is that we get a "bit already cleared" message from
617ba13b 2134 * ext4_free_inode(). The only reason we would point at a wrong inode is if
ac27a0ec
DK		 2135 * e2fsck was run on this filesystem, and it must have already done the orphan
2136 * inode cleanup for us, so we can safely abort without any further action.
2137 */
2b2d6d01
TT		 2138static void ext4_orphan_cleanup(struct super_block *sb,
2139 struct ext4_super_block *es)
ac27a0ec
DK		 2140{
2141 unsigned int s_flags = sb->s_flags;
2142 int nr_orphans = 0, nr_truncates = 0;
2143#ifdef CONFIG_QUOTA
2144 int i;
2145#endif
2146 if (!es->s_last_orphan) {
2147 jbd_debug(4, "no orphan inodes to clean up\n");
2148 return;
2149 }
2150
a8f48a95 2151 if (bdev_read_only(sb->s_bdev)) {
b31e1552
ES		 2152 ext4_msg(sb, KERN_ERR, "write access "
2153 "unavailable, skipping orphan cleanup");
a8f48a95
ES		 2154 return;
2155 }
2156
d39195c3
AG		 2157 /* Check if feature set would not allow a r/w mount */
2158 if (!ext4_feature_set_ok(sb, 0)) {
2159 ext4_msg(sb, KERN_INFO, "Skipping orphan cleanup due to "
2160 "unknown ROCOMPAT features");
2161 return;
2162 }
2163
617ba13b 2164 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
c25f9bc6
ES		 2165 /* don't clear list on RO mount w/ errors */
2166 if (es->s_last_orphan && !(s_flags & MS_RDONLY)) {
84474976 2167 ext4_msg(sb, KERN_INFO, "Errors on filesystem, "
ac27a0ec 2168 "clearing orphan list.\n");
c25f9bc6
ES		 2169 es->s_last_orphan = 0;
2170 }
ac27a0ec
DK		 2171 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2172 return;
2173 }
2174
2175 if (s_flags & MS_RDONLY) {
b31e1552 2176 ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
ac27a0ec
DK		 2177 sb->s_flags &= ~MS_RDONLY;
2178 }
2179#ifdef CONFIG_QUOTA
2180 /* Needed for iput() to work correctly and not trash data */
2181 sb->s_flags |= MS_ACTIVE;
2182 /* Turn on quotas so that they are updated correctly */
a2d4a646 2183 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
617ba13b
MC		 2184 if (EXT4_SB(sb)->s_qf_names[i]) {
2185 int ret = ext4_quota_on_mount(sb, i);
ac27a0ec 2186 if (ret < 0)
b31e1552
ES		 2187 ext4_msg(sb, KERN_ERR,
2188 "Cannot turn on journaled "
2189 "quota: error %d", ret);
ac27a0ec
DK		 2190 }
2191 }
2192#endif
2193
2194 while (es->s_last_orphan) {
2195 struct inode *inode;
2196
97bd42b9
JB		 2197 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
2198 if (IS_ERR(inode)) {
ac27a0ec
DK		 2199 es->s_last_orphan = 0;
2200 break;
2201 }
2202
617ba13b 2203 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
871a2931 2204 dquot_initialize(inode);
ac27a0ec 2205 if (inode->i_nlink) {
566370a2
PT		 2206 if (test_opt(sb, DEBUG))
2207 ext4_msg(sb, KERN_DEBUG,
2208 "%s: truncating inode %lu to %lld bytes",
2209 __func__, inode->i_ino, inode->i_size);
e5f8eab8 2210 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
ac27a0ec 2211 inode->i_ino, inode->i_size);
721e3eba 2212 mutex_lock(&inode->i_mutex);
55f252c9 2213 truncate_inode_pages(inode->i_mapping, inode->i_size);
617ba13b 2214 ext4_truncate(inode);
721e3eba 2215 mutex_unlock(&inode->i_mutex);
ac27a0ec
DK		 2216 nr_truncates++;
2217 } else {
566370a2
PT		 2218 if (test_opt(sb, DEBUG))
2219 ext4_msg(sb, KERN_DEBUG,
2220 "%s: deleting unreferenced inode %lu",
2221 __func__, inode->i_ino);
ac27a0ec
DK		 2222 jbd_debug(2, "deleting unreferenced inode %lu\n",
2223 inode->i_ino);
2224 nr_orphans++;
2225 }
2226 iput(inode); /* The delete magic happens here! */
2227 }
2228
2b2d6d01 2229#define PLURAL(x) (x), ((x) == 1) ? "" : "s"
ac27a0ec
DK		 2230
2231 if (nr_orphans)
b31e1552
ES		 2232 ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
2233 PLURAL(nr_orphans));
ac27a0ec 2234 if (nr_truncates)
b31e1552
ES		 2235 ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
2236 PLURAL(nr_truncates));
ac27a0ec
DK		 2237#ifdef CONFIG_QUOTA
2238 /* Turn quotas off */
a2d4a646 2239 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
ac27a0ec 2240 if (sb_dqopt(sb)->files[i])
287a8095 2241 dquot_quota_off(sb, i);
ac27a0ec
DK		 2242 }
2243#endif
2244 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
2245}
0b8e58a1 2246
cd2291a4
ES		 2247/*
2248 * Maximal extent format file size.
2249 * Resulting logical blkno at s_maxbytes must fit in our on-disk
2250 * extent format containers, within a sector_t, and within i_blocks
2251 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
2252 * so that won't be a limiting factor.
2253 *
f17722f9
LC		 2254 * However there is other limiting factor. We do store extents in the form
2255 * of starting block and length, hence the resulting length of the extent
2256 * covering maximum file size must fit into on-disk format containers as
2257 * well. Given that length is always by 1 unit bigger than max unit (because
2258 * we count 0 as well) we have to lower the s_maxbytes by one fs block.
2259 *
cd2291a4
ES		 2260 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
2261 */
f287a1a5 2262static loff_t ext4_max_size(int blkbits, int has_huge_files)
cd2291a4
ES		 2263{
2264 loff_t res;
2265 loff_t upper_limit = MAX_LFS_FILESIZE;
2266
2267 /* small i_blocks in vfs inode? */
f287a1a5 2268 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
cd2291a4 2269 /*
90c699a9 2270 * CONFIG_LBDAF is not enabled implies the inode
cd2291a4
ES		 2271 * i_block represent total blocks in 512 bytes
2272 * 32 == size of vfs inode i_blocks * 8
2273 */
2274 upper_limit = (1LL << 32) - 1;
2275
2276 /* total blocks in file system block size */
2277 upper_limit >>= (blkbits - 9);
2278 upper_limit <<= blkbits;
2279 }
2280
f17722f9
LC		 2281 /*
2282 * 32-bit extent-start container, ee_block. We lower the maxbytes
2283 * by one fs block, so ee_len can cover the extent of maximum file
2284 * size
2285 */
2286 res = (1LL << 32) - 1;
cd2291a4 2287 res <<= blkbits;
cd2291a4
ES		 2288
2289 /* Sanity check against vm- & vfs- imposed limits */
2290 if (res > upper_limit)
2291 res = upper_limit;
2292
2293 return res;
2294}
ac27a0ec 2295
ac27a0ec 2296/*
cd2291a4 2297 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
0fc1b451
AK		 2298 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2299 * We need to be 1 filesystem block less than the 2^48 sector limit.
ac27a0ec 2300 */
f287a1a5 2301static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
ac27a0ec 2302{
617ba13b 2303 loff_t res = EXT4_NDIR_BLOCKS;
0fc1b451
AK		 2304 int meta_blocks;
2305 loff_t upper_limit;
0b8e58a1
AD		 2306 /* This is calculated to be the largest file size for a dense, block
2307 * mapped file such that the file's total number of 512-byte sectors,
2308 * including data and all indirect blocks, does not exceed (2^48 - 1).
2309 *
2310 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2311 * number of 512-byte sectors of the file.
0fc1b451
AK		 2312 */
2313
f287a1a5 2314 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
0fc1b451 2315 /*
90c699a9 2316 * !has_huge_files or CONFIG_LBDAF not enabled implies that
0b8e58a1
AD		 2317 * the inode i_block field represents total file blocks in
2318 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
0fc1b451
AK		 2319 */
2320 upper_limit = (1LL << 32) - 1;
2321
2322 /* total blocks in file system block size */
2323 upper_limit >>= (bits - 9);
2324
2325 } else {
8180a562
AK		 2326 /*
2327 * We use 48 bit ext4_inode i_blocks
2328 * With EXT4_HUGE_FILE_FL set the i_blocks
2329 * represent total number of blocks in
2330 * file system block size
2331 */
0fc1b451
AK		 2332 upper_limit = (1LL << 48) - 1;
2333
0fc1b451
AK		 2334 }
2335
2336 /* indirect blocks */
2337 meta_blocks = 1;
2338 /* double indirect blocks */
2339 meta_blocks += 1 + (1LL << (bits-2));
2340 /* tripple indirect blocks */
2341 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
2342
2343 upper_limit -= meta_blocks;
2344 upper_limit <<= bits;
ac27a0ec
DK		 2345
2346 res += 1LL << (bits-2);
2347 res += 1LL << (2*(bits-2));
2348 res += 1LL << (3*(bits-2));
2349 res <<= bits;
2350 if (res > upper_limit)
2351 res = upper_limit;
0fc1b451
AK		 2352
2353 if (res > MAX_LFS_FILESIZE)
2354 res = MAX_LFS_FILESIZE;
2355
ac27a0ec
DK		 2356 return res;
2357}
2358
617ba13b 2359static ext4_fsblk_t descriptor_loc(struct super_block *sb,
0b8e58a1 2360 ext4_fsblk_t logical_sb_block, int nr)
ac27a0ec 2361{
617ba13b 2362 struct ext4_sb_info *sbi = EXT4_SB(sb);
fd2d4291 2363 ext4_group_t bg, first_meta_bg;
ac27a0ec
DK		 2364 int has_super = 0;
2365
2366 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
2367
617ba13b 2368 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
ac27a0ec 2369 nr < first_meta_bg)
70bbb3e0 2370 return logical_sb_block + nr + 1;
ac27a0ec 2371 bg = sbi->s_desc_per_block * nr;
617ba13b 2372 if (ext4_bg_has_super(sb, bg))
ac27a0ec 2373 has_super = 1;
0b8e58a1 2374
bd63f6b0
DW		 2375 /*
2376 * If we have a meta_bg fs with 1k blocks, group 0's GDT is at
2377 * block 2, not 1. If s_first_data_block == 0 (bigalloc is enabled
2378 * on modern mke2fs or blksize > 1k on older mke2fs) then we must
2379 * compensate.
2380 */
2381 if (sb->s_blocksize == 1024 && nr == 0 &&
2382 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block) == 0)
2383 has_super++;
2384
617ba13b 2385 return (has_super + ext4_group_first_block_no(sb, bg));
ac27a0ec
DK		 2386}
2387
c9de560d
AT		 2388/**
2389 * ext4_get_stripe_size: Get the stripe size.
2390 * @sbi: In memory super block info
2391 *
2392 * If we have specified it via mount option, then
2393 * use the mount option value. If the value specified at mount time is
2394 * greater than the blocks per group use the super block value.
2395 * If the super block value is greater than blocks per group return 0.
2396 * Allocator needs it be less than blocks per group.
2397 *
2398 */
2399static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
2400{
2401 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
2402 unsigned long stripe_width =
2403 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
3eb08658 2404 int ret;
c9de560d
AT		 2405
2406 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
3eb08658
DE		 2407 ret = sbi->s_stripe;
2408 else if (stripe_width <= sbi->s_blocks_per_group)
2409 ret = stripe_width;
2410 else if (stride <= sbi->s_blocks_per_group)
2411 ret = stride;
2412 else
2413 ret = 0;
c9de560d 2414
3eb08658
DE		 2415 /*
2416 * If the stripe width is 1, this makes no sense and
2417 * we set it to 0 to turn off stripe handling code.
2418 */
2419 if (ret <= 1)
2420 ret = 0;
c9de560d 2421
3eb08658 2422 return ret;
c9de560d 2423}
ac27a0ec 2424
3197ebdb
TT		 2425/* sysfs supprt */
2426
2427struct ext4_attr {
2428 struct attribute attr;
2429 ssize_t (*show)(struct ext4_attr *, struct ext4_sb_info *, char *);
60e6679e 2430 ssize_t (*store)(struct ext4_attr *, struct ext4_sb_info *,
3197ebdb 2431 const char *, size_t);
f2d50a65
JK		 2432 union {
2433 int offset;
2434 int deprecated_val;
2435 } u;
3197ebdb
TT		 2436};
2437
27dd4385
LC		 2438static int parse_strtoull(const char *buf,
2439 unsigned long long max, unsigned long long *value)
2440{
2441 int ret;
2442
2443 ret = kstrtoull(skip_spaces(buf), 0, value);
2444 if (!ret && *value > max)
2445 ret = -EINVAL;
2446 return ret;
2447}
2448
3197ebdb
TT		 2449static ssize_t delayed_allocation_blocks_show(struct ext4_attr *a,
2450 struct ext4_sb_info *sbi,
2451 char *buf)
2452{
2453 return snprintf(buf, PAGE_SIZE, "%llu\n",
7b415bf6
AK		 2454 (s64) EXT4_C2B(sbi,
2455 percpu_counter_sum(&sbi->s_dirtyclusters_counter)));
3197ebdb
TT		 2456}
2457
2458static ssize_t session_write_kbytes_show(struct ext4_attr *a,
2459 struct ext4_sb_info *sbi, char *buf)
2460{
2461 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2462
f613dfcb
TT		 2463 if (!sb->s_bdev->bd_part)
2464 return snprintf(buf, PAGE_SIZE, "0\n");
3197ebdb
TT		 2465 return snprintf(buf, PAGE_SIZE, "%lu\n",
2466 (part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
2467 sbi->s_sectors_written_start) >> 1);
2468}
2469
2470static ssize_t lifetime_write_kbytes_show(struct ext4_attr *a,
2471 struct ext4_sb_info *sbi, char *buf)
2472{
2473 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2474
f613dfcb
TT		 2475 if (!sb->s_bdev->bd_part)
2476 return snprintf(buf, PAGE_SIZE, "0\n");
3197ebdb 2477 return snprintf(buf, PAGE_SIZE, "%llu\n",
a6b43e38 2478 (unsigned long long)(sbi->s_kbytes_written +
3197ebdb 2479 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
a6b43e38 2480 EXT4_SB(sb)->s_sectors_written_start) >> 1)));
3197ebdb
TT		 2481}
2482
2483static ssize_t inode_readahead_blks_store(struct ext4_attr *a,
2484 struct ext4_sb_info *sbi,
2485 const char *buf, size_t count)
2486{
2487 unsigned long t;
e1091b15 2488 int ret;
3197ebdb 2489
e1091b15
LC		 2490 ret = kstrtoul(skip_spaces(buf), 0, &t);
2491 if (ret)
2492 return ret;
3197ebdb 2493
e1091b15 2494 if (t && (!is_power_of_2(t) || t > 0x40000000))
3197ebdb
TT		 2495 return -EINVAL;
2496
2497 sbi->s_inode_readahead_blks = t;
2498 return count;
2499}
2500
2501static ssize_t sbi_ui_show(struct ext4_attr *a,
0b8e58a1 2502 struct ext4_sb_info *sbi, char *buf)
3197ebdb 2503{
f2d50a65 2504 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->u.offset);
3197ebdb
TT		 2505
2506 return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
2507}
2508
2509static ssize_t sbi_ui_store(struct ext4_attr *a,
2510 struct ext4_sb_info *sbi,
2511 const char *buf, size_t count)
2512{
f2d50a65 2513 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->u.offset);
3197ebdb 2514 unsigned long t;
e1091b15 2515 int ret;
3197ebdb 2516
e1091b15
LC		 2517 ret = kstrtoul(skip_spaces(buf), 0, &t);
2518 if (ret)
2519 return ret;
3197ebdb
TT		 2520 *ui = t;
2521 return count;
2522}
2523
52c198c6
LC		 2524static ssize_t es_ui_show(struct ext4_attr *a,
2525 struct ext4_sb_info *sbi, char *buf)
2526{
2527
2528 unsigned int *ui = (unsigned int *) (((char *) sbi->s_es) +
2529 a->u.offset);
2530
2531 return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
2532}
2533
27dd4385
LC		 2534static ssize_t reserved_clusters_show(struct ext4_attr *a,
2535 struct ext4_sb_info *sbi, char *buf)
2536{
2537 return snprintf(buf, PAGE_SIZE, "%llu\n",
2538 (unsigned long long) atomic64_read(&sbi->s_resv_clusters));
2539}
2540
2541static ssize_t reserved_clusters_store(struct ext4_attr *a,
2542 struct ext4_sb_info *sbi,
2543 const char *buf, size_t count)
2544{
2545 unsigned long long val;
2546 int ret;
2547
2548 if (parse_strtoull(buf, -1ULL, &val))
2549 return -EINVAL;
2550 ret = ext4_reserve_clusters(sbi, val);
2551
2552 return ret ? ret : count;
2553}
2554
2c0544b2
TT		 2555static ssize_t trigger_test_error(struct ext4_attr *a,
2556 struct ext4_sb_info *sbi,
2557 const char *buf, size_t count)
2558{
2559 int len = count;
2560
2561 if (!capable(CAP_SYS_ADMIN))
2562 return -EPERM;
2563
2564 if (len && buf[len-1] == '\n')
2565 len--;
2566
2567 if (len)
2568 ext4_error(sbi->s_sb, "%.*s", len, buf);
2569 return count;
2570}
2571
f2d50a65
JK		 2572static ssize_t sbi_deprecated_show(struct ext4_attr *a,
2573 struct ext4_sb_info *sbi, char *buf)
2574{
2575 return snprintf(buf, PAGE_SIZE, "%d\n", a->u.deprecated_val);
2576}
2577
3197ebdb
TT		 2578#define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \
2579static struct ext4_attr ext4_attr_##_name = { \
2580 .attr = {.name = __stringify(_name), .mode = _mode }, \
2581 .show = _show, \
2582 .store = _store, \
f2d50a65
JK		 2583 .u = { \
2584 .offset = offsetof(struct ext4_sb_info, _elname),\
2585 }, \
3197ebdb 2586}
52c198c6
LC		 2587
2588#define EXT4_ATTR_OFFSET_ES(_name,_mode,_show,_store,_elname) \
2589static struct ext4_attr ext4_attr_##_name = { \
2590 .attr = {.name = __stringify(_name), .mode = _mode }, \
2591 .show = _show, \
2592 .store = _store, \
2593 .u = { \
2594 .offset = offsetof(struct ext4_super_block, _elname), \
2595 }, \
2596}
2597
3197ebdb
TT		 2598#define EXT4_ATTR(name, mode, show, store) \
2599static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store)
2600
857ac889 2601#define EXT4_INFO_ATTR(name) EXT4_ATTR(name, 0444, NULL, NULL)
3197ebdb
TT		 2602#define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL)
2603#define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store)
52c198c6
LC		 2604
2605#define EXT4_RO_ATTR_ES_UI(name, elname) \
2606 EXT4_ATTR_OFFSET_ES(name, 0444, es_ui_show, NULL, elname)
3197ebdb
TT		 2607#define EXT4_RW_ATTR_SBI_UI(name, elname) \
2608 EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname)
52c198c6 2609
3197ebdb 2610#define ATTR_LIST(name) &ext4_attr_##name.attr
f2d50a65
JK		 2611#define EXT4_DEPRECATED_ATTR(_name, _val) \
2612static struct ext4_attr ext4_attr_##_name = { \
2613 .attr = {.name = __stringify(_name), .mode = 0444 }, \
2614 .show = sbi_deprecated_show, \
2615 .u = { \
2616 .deprecated_val = _val, \
2617 }, \
2618}
3197ebdb
TT		 2619
2620EXT4_RO_ATTR(delayed_allocation_blocks);
2621EXT4_RO_ATTR(session_write_kbytes);
2622EXT4_RO_ATTR(lifetime_write_kbytes);
27dd4385 2623EXT4_RW_ATTR(reserved_clusters);
3197ebdb
TT		 2624EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, sbi_ui_show,
2625 inode_readahead_blks_store, s_inode_readahead_blks);
11013911 2626EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal);
3197ebdb
TT		 2627EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats);
2628EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan);
2629EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan);
2630EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs);
2631EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request);
2632EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc);
f2d50a65 2633EXT4_DEPRECATED_ATTR(max_writeback_mb_bump, 128);
67a5da56 2634EXT4_RW_ATTR_SBI_UI(extent_max_zeroout_kb, s_extent_max_zeroout_kb);
2c0544b2 2635EXT4_ATTR(trigger_fs_error, 0200, NULL, trigger_test_error);
efbed4dc
TT		 2636EXT4_RW_ATTR_SBI_UI(err_ratelimit_interval_ms, s_err_ratelimit_state.interval);
2637EXT4_RW_ATTR_SBI_UI(err_ratelimit_burst, s_err_ratelimit_state.burst);
2638EXT4_RW_ATTR_SBI_UI(warning_ratelimit_interval_ms, s_warning_ratelimit_state.interval);
2639EXT4_RW_ATTR_SBI_UI(warning_ratelimit_burst, s_warning_ratelimit_state.burst);
2640EXT4_RW_ATTR_SBI_UI(msg_ratelimit_interval_ms, s_msg_ratelimit_state.interval);
2641EXT4_RW_ATTR_SBI_UI(msg_ratelimit_burst, s_msg_ratelimit_state.burst);
52c198c6
LC		 2642EXT4_RO_ATTR_ES_UI(errors_count, s_error_count);
2643EXT4_RO_ATTR_ES_UI(first_error_time, s_first_error_time);
2644EXT4_RO_ATTR_ES_UI(last_error_time, s_last_error_time);
3197ebdb
TT		 2645
2646static struct attribute *ext4_attrs[] = {
2647 ATTR_LIST(delayed_allocation_blocks),
2648 ATTR_LIST(session_write_kbytes),
2649 ATTR_LIST(lifetime_write_kbytes),
27dd4385 2650 ATTR_LIST(reserved_clusters),
3197ebdb 2651 ATTR_LIST(inode_readahead_blks),
11013911 2652 ATTR_LIST(inode_goal),
3197ebdb
TT		 2653 ATTR_LIST(mb_stats),
2654 ATTR_LIST(mb_max_to_scan),
2655 ATTR_LIST(mb_min_to_scan),
2656 ATTR_LIST(mb_order2_req),
2657 ATTR_LIST(mb_stream_req),
2658 ATTR_LIST(mb_group_prealloc),
55138e0b 2659 ATTR_LIST(max_writeback_mb_bump),
67a5da56 2660 ATTR_LIST(extent_max_zeroout_kb),
2c0544b2 2661 ATTR_LIST(trigger_fs_error),
efbed4dc
TT		 2662 ATTR_LIST(err_ratelimit_interval_ms),
2663 ATTR_LIST(err_ratelimit_burst),
2664 ATTR_LIST(warning_ratelimit_interval_ms),
2665 ATTR_LIST(warning_ratelimit_burst),
2666 ATTR_LIST(msg_ratelimit_interval_ms),
2667 ATTR_LIST(msg_ratelimit_burst),
52c198c6
LC		 2668 ATTR_LIST(errors_count),
2669 ATTR_LIST(first_error_time),
2670 ATTR_LIST(last_error_time),
3197ebdb
TT		 2671 NULL,
2672};
2673
857ac889
LC		 2674/* Features this copy of ext4 supports */
2675EXT4_INFO_ATTR(lazy_itable_init);
27ee40df 2676EXT4_INFO_ATTR(batched_discard);
5e7bbef1 2677EXT4_INFO_ATTR(meta_bg_resize);
857ac889
LC		 2678
2679static struct attribute *ext4_feat_attrs[] = {
2680 ATTR_LIST(lazy_itable_init),
27ee40df 2681 ATTR_LIST(batched_discard),
5e7bbef1 2682 ATTR_LIST(meta_bg_resize),
857ac889
LC		 2683 NULL,
2684};
2685
3197ebdb
TT		 2686static ssize_t ext4_attr_show(struct kobject *kobj,
2687 struct attribute *attr, char *buf)
2688{
2689 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2690 s_kobj);
2691 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2692
2693 return a->show ? a->show(a, sbi, buf) : 0;
2694}
2695
2696static ssize_t ext4_attr_store(struct kobject *kobj,
2697 struct attribute *attr,
2698 const char *buf, size_t len)
2699{
2700 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2701 s_kobj);
2702 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2703
2704 return a->store ? a->store(a, sbi, buf, len) : 0;
2705}
2706
2707static void ext4_sb_release(struct kobject *kobj)
2708{
2709 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2710 s_kobj);
2711 complete(&sbi->s_kobj_unregister);
2712}
2713
52cf25d0 2714static const struct sysfs_ops ext4_attr_ops = {
3197ebdb
TT		 2715 .show = ext4_attr_show,
2716 .store = ext4_attr_store,
2717};
2718
2719static struct kobj_type ext4_ktype = {
2720 .default_attrs = ext4_attrs,
2721 .sysfs_ops = &ext4_attr_ops,
2722 .release = ext4_sb_release,
2723};
2724
857ac889
LC		 2725static void ext4_feat_release(struct kobject *kobj)
2726{
2727 complete(&ext4_feat->f_kobj_unregister);
2728}
2729
c7f72543
LC		 2730static ssize_t ext4_feat_show(struct kobject *kobj,
2731 struct attribute *attr, char *buf)
2732{
2733 return snprintf(buf, PAGE_SIZE, "supported\n");
2734}
2735
2736/*
2737 * We can not use ext4_attr_show/store because it relies on the kobject
2738 * being embedded in the ext4_sb_info structure which is definitely not
2739 * true in this case.
2740 */
2741static const struct sysfs_ops ext4_feat_ops = {
2742 .show = ext4_feat_show,
2743 .store = NULL,
2744};
2745
857ac889
LC		 2746static struct kobj_type ext4_feat_ktype = {
2747 .default_attrs = ext4_feat_attrs,
c7f72543 2748 .sysfs_ops = &ext4_feat_ops,
857ac889
LC		 2749 .release = ext4_feat_release,
2750};
2751
a13fb1a4
ES		 2752/*
2753 * Check whether this filesystem can be mounted based on
2754 * the features present and the RDONLY/RDWR mount requested.
2755 * Returns 1 if this filesystem can be mounted as requested,
2756 * 0 if it cannot be.
2757 */
2758static int ext4_feature_set_ok(struct super_block *sb, int readonly)
2759{
2760 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP)) {
2761 ext4_msg(sb, KERN_ERR,
2762 "Couldn't mount because of "
2763 "unsupported optional features (%x)",
2764 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
2765 ~EXT4_FEATURE_INCOMPAT_SUPP));
2766 return 0;
2767 }
2768
2769 if (readonly)
2770 return 1;
2771
2772 /* Check that feature set is OK for a read-write mount */
2773 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP)) {
2774 ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of "
2775 "unsupported optional features (%x)",
2776 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
2777 ~EXT4_FEATURE_RO_COMPAT_SUPP));
2778 return 0;
2779 }
2780 /*
2781 * Large file size enabled file system can only be mounted
2782 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
2783 */
2784 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) {
2785 if (sizeof(blkcnt_t) < sizeof(u64)) {
2786 ext4_msg(sb, KERN_ERR, "Filesystem with huge files "
2787 "cannot be mounted RDWR without "
2788 "CONFIG_LBDAF");
2789 return 0;
2790 }
2791 }
bab08ab9
TT		 2792 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_BIGALLOC) &&
2793 !EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS)) {
2794 ext4_msg(sb, KERN_ERR,
2795 "Can't support bigalloc feature without "
2796 "extents feature\n");
2797 return 0;
2798 }
7c319d32
AK		 2799
2800#ifndef CONFIG_QUOTA
2801 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) &&
2802 !readonly) {
2803 ext4_msg(sb, KERN_ERR,
2804 "Filesystem with quota feature cannot be mounted RDWR "
2805 "without CONFIG_QUOTA");
2806 return 0;
2807 }
2808#endif /* CONFIG_QUOTA */
a13fb1a4
ES		 2809 return 1;
2810}
2811
66e61a9e
TT		 2812/*
2813 * This function is called once a day if we have errors logged
2814 * on the file system
2815 */
2816static void print_daily_error_info(unsigned long arg)
2817{
2818 struct super_block *sb = (struct super_block *) arg;
2819 struct ext4_sb_info *sbi;
2820 struct ext4_super_block *es;
2821
2822 sbi = EXT4_SB(sb);
2823 es = sbi->s_es;
2824
2825 if (es->s_error_count)
ae0f78de
TT		 2826 /* fsck newer than v1.41.13 is needed to clean this condition. */
2827 ext4_msg(sb, KERN_NOTICE, "error count since last fsck: %u",
66e61a9e
TT		 2828 le32_to_cpu(es->s_error_count));
2829 if (es->s_first_error_time) {
ae0f78de 2830 printk(KERN_NOTICE "EXT4-fs (%s): initial error at time %u: %.*s:%d",
66e61a9e
TT		 2831 sb->s_id, le32_to_cpu(es->s_first_error_time),
2832 (int) sizeof(es->s_first_error_func),
2833 es->s_first_error_func,
2834 le32_to_cpu(es->s_first_error_line));
2835 if (es->s_first_error_ino)
2836 printk(": inode %u",
2837 le32_to_cpu(es->s_first_error_ino));
2838 if (es->s_first_error_block)
2839 printk(": block %llu", (unsigned long long)
2840 le64_to_cpu(es->s_first_error_block));
2841 printk("\n");
2842 }
2843 if (es->s_last_error_time) {
ae0f78de 2844 printk(KERN_NOTICE "EXT4-fs (%s): last error at time %u: %.*s:%d",
66e61a9e
TT		 2845 sb->s_id, le32_to_cpu(es->s_last_error_time),
2846 (int) sizeof(es->s_last_error_func),
2847 es->s_last_error_func,
2848 le32_to_cpu(es->s_last_error_line));
2849 if (es->s_last_error_ino)
2850 printk(": inode %u",
2851 le32_to_cpu(es->s_last_error_ino));
2852 if (es->s_last_error_block)
2853 printk(": block %llu", (unsigned long long)
2854 le64_to_cpu(es->s_last_error_block));
2855 printk("\n");
2856 }
2857 mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ); /* Once a day */
2858}
2859
bfff6873
LC		 2860/* Find next suitable group and run ext4_init_inode_table */
2861static int ext4_run_li_request(struct ext4_li_request *elr)
2862{
2863 struct ext4_group_desc *gdp = NULL;
2864 ext4_group_t group, ngroups;
2865 struct super_block *sb;
2866 unsigned long timeout = 0;
2867 int ret = 0;
2868
2869 sb = elr->lr_super;
2870 ngroups = EXT4_SB(sb)->s_groups_count;
2871
8e8ad8a5 2872 sb_start_write(sb);
bfff6873
LC		 2873 for (group = elr->lr_next_group; group < ngroups; group++) {
2874 gdp = ext4_get_group_desc(sb, group, NULL);
2875 if (!gdp) {
2876 ret = 1;
2877 break;
2878 }
2879
2880 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2881 break;
2882 }
2883
7f511862 2884 if (group >= ngroups)
bfff6873
LC		 2885 ret = 1;
2886
2887 if (!ret) {
2888 timeout = jiffies;
2889 ret = ext4_init_inode_table(sb, group,
2890 elr->lr_timeout ? 0 : 1);
2891 if (elr->lr_timeout == 0) {
51ce6511
LC		 2892 timeout = (jiffies - timeout) *
2893 elr->lr_sbi->s_li_wait_mult;
bfff6873
LC		 2894 elr->lr_timeout = timeout;
2895 }
2896 elr->lr_next_sched = jiffies + elr->lr_timeout;
2897 elr->lr_next_group = group + 1;
2898 }
8e8ad8a5 2899 sb_end_write(sb);
bfff6873
LC		 2900
2901 return ret;
2902}
2903
2904/*
2905 * Remove lr_request from the list_request and free the
4ed5c033 2906 * request structure. Should be called with li_list_mtx held
bfff6873
LC		 2907 */
2908static void ext4_remove_li_request(struct ext4_li_request *elr)
2909{
2910 struct ext4_sb_info *sbi;
2911
2912 if (!elr)
2913 return;
2914
2915 sbi = elr->lr_sbi;
2916
2917 list_del(&elr->lr_request);
2918 sbi->s_li_request = NULL;
2919 kfree(elr);
2920}
2921
2922static void ext4_unregister_li_request(struct super_block *sb)
2923{
1bb933fb
LC		 2924 mutex_lock(&ext4_li_mtx);
2925 if (!ext4_li_info) {
2926 mutex_unlock(&ext4_li_mtx);
bfff6873 2927 return;
1bb933fb 2928 }
bfff6873
LC		 2929
2930 mutex_lock(&ext4_li_info->li_list_mtx);
1bb933fb 2931 ext4_remove_li_request(EXT4_SB(sb)->s_li_request);
bfff6873 2932 mutex_unlock(&ext4_li_info->li_list_mtx);
1bb933fb 2933 mutex_unlock(&ext4_li_mtx);
bfff6873
LC		 2934}
2935
8f1f7453
ES		 2936static struct task_struct *ext4_lazyinit_task;
2937
bfff6873
LC		 2938/*
2939 * This is the function where ext4lazyinit thread lives. It walks
2940 * through the request list searching for next scheduled filesystem.
2941 * When such a fs is found, run the lazy initialization request
2942 * (ext4_rn_li_request) and keep track of the time spend in this
2943 * function. Based on that time we compute next schedule time of
2944 * the request. When walking through the list is complete, compute
2945 * next waking time and put itself into sleep.
2946 */
2947static int ext4_lazyinit_thread(void *arg)
2948{
2949 struct ext4_lazy_init *eli = (struct ext4_lazy_init *)arg;
2950 struct list_head *pos, *n;
2951 struct ext4_li_request *elr;
4ed5c033 2952 unsigned long next_wakeup, cur;
bfff6873
LC		 2953
2954 BUG_ON(NULL == eli);
2955
bfff6873
LC		 2956cont_thread:
2957 while (true) {
2958 next_wakeup = MAX_JIFFY_OFFSET;
2959
2960 mutex_lock(&eli->li_list_mtx);
2961 if (list_empty(&eli->li_request_list)) {
2962 mutex_unlock(&eli->li_list_mtx);
2963 goto exit_thread;
2964 }
2965
2966 list_for_each_safe(pos, n, &eli->li_request_list) {
2967 elr = list_entry(pos, struct ext4_li_request,
2968 lr_request);
2969
b2c78cd0
TT		 2970 if (time_after_eq(jiffies, elr->lr_next_sched)) {
2971 if (ext4_run_li_request(elr) != 0) {
2972 /* error, remove the lazy_init job */
2973 ext4_remove_li_request(elr);
2974 continue;
2975 }
bfff6873
LC		 2976 }
2977
2978 if (time_before(elr->lr_next_sched, next_wakeup))
2979 next_wakeup = elr->lr_next_sched;
2980 }
2981 mutex_unlock(&eli->li_list_mtx);
2982
a0acae0e 2983 try_to_freeze();
bfff6873 2984
4ed5c033
LC		 2985 cur = jiffies;
2986 if ((time_after_eq(cur, next_wakeup)) ||
f4245bd4 2987 (MAX_JIFFY_OFFSET == next_wakeup)) {
bfff6873
LC		 2988 cond_resched();
2989 continue;
2990 }
2991
4ed5c033
LC		 2992 schedule_timeout_interruptible(next_wakeup - cur);
2993
8f1f7453
ES		 2994 if (kthread_should_stop()) {
2995 ext4_clear_request_list();
2996 goto exit_thread;
2997 }
bfff6873
LC		 2998 }
2999
3000exit_thread:
3001 /*
3002 * It looks like the request list is empty, but we need
3003 * to check it under the li_list_mtx lock, to prevent any
3004 * additions into it, and of course we should lock ext4_li_mtx
3005 * to atomically free the list and ext4_li_info, because at
3006 * this point another ext4 filesystem could be registering
3007 * new one.
3008 */
3009 mutex_lock(&ext4_li_mtx);
3010 mutex_lock(&eli->li_list_mtx);
3011 if (!list_empty(&eli->li_request_list)) {
3012 mutex_unlock(&eli->li_list_mtx);
3013 mutex_unlock(&ext4_li_mtx);
3014 goto cont_thread;
3015 }
3016 mutex_unlock(&eli->li_list_mtx);
bfff6873
LC		 3017 kfree(ext4_li_info);
3018 ext4_li_info = NULL;
3019 mutex_unlock(&ext4_li_mtx);
3020
3021 return 0;
3022}
3023
3024static void ext4_clear_request_list(void)
3025{
3026 struct list_head *pos, *n;
3027 struct ext4_li_request *elr;
3028
3029 mutex_lock(&ext4_li_info->li_list_mtx);
bfff6873
LC		 3030 list_for_each_safe(pos, n, &ext4_li_info->li_request_list) {
3031 elr = list_entry(pos, struct ext4_li_request,
3032 lr_request);
3033 ext4_remove_li_request(elr);
3034 }
3035 mutex_unlock(&ext4_li_info->li_list_mtx);
3036}
3037
3038static int ext4_run_lazyinit_thread(void)
3039{
8f1f7453
ES		 3040 ext4_lazyinit_task = kthread_run(ext4_lazyinit_thread,
3041 ext4_li_info, "ext4lazyinit");
3042 if (IS_ERR(ext4_lazyinit_task)) {
3043 int err = PTR_ERR(ext4_lazyinit_task);
bfff6873 3044 ext4_clear_request_list();
bfff6873
LC		 3045 kfree(ext4_li_info);
3046 ext4_li_info = NULL;
92b97816 3047 printk(KERN_CRIT "EXT4-fs: error %d creating inode table "
bfff6873
LC		 3048 "initialization thread\n",
3049 err);
3050 return err;
3051 }
3052 ext4_li_info->li_state |= EXT4_LAZYINIT_RUNNING;
bfff6873
LC		 3053 return 0;
3054}
3055
3056/*
3057 * Check whether it make sense to run itable init. thread or not.
3058 * If there is at least one uninitialized inode table, return
3059 * corresponding group number, else the loop goes through all
3060 * groups and return total number of groups.
3061 */
3062static ext4_group_t ext4_has_uninit_itable(struct super_block *sb)
3063{
3064 ext4_group_t group, ngroups = EXT4_SB(sb)->s_groups_count;
3065 struct ext4_group_desc *gdp = NULL;
3066
3067 for (group = 0; group < ngroups; group++) {
3068 gdp = ext4_get_group_desc(sb, group, NULL);
3069 if (!gdp)
3070 continue;
3071
3072 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
3073 break;
3074 }
3075
3076 return group;
3077}
3078
3079static int ext4_li_info_new(void)
3080{
3081 struct ext4_lazy_init *eli = NULL;
3082
3083 eli = kzalloc(sizeof(*eli), GFP_KERNEL);
3084 if (!eli)
3085 return -ENOMEM;
3086
bfff6873
LC		 3087 INIT_LIST_HEAD(&eli->li_request_list);
3088 mutex_init(&eli->li_list_mtx);
3089
bfff6873
LC		 3090 eli->li_state |= EXT4_LAZYINIT_QUIT;
3091
3092 ext4_li_info = eli;
3093
3094 return 0;
3095}
3096
3097static struct ext4_li_request *ext4_li_request_new(struct super_block *sb,
3098 ext4_group_t start)
3099{
3100 struct ext4_sb_info *sbi = EXT4_SB(sb);
3101 struct ext4_li_request *elr;
bfff6873
LC		 3102
3103 elr = kzalloc(sizeof(*elr), GFP_KERNEL);
3104 if (!elr)
3105 return NULL;
3106
3107 elr->lr_super = sb;
3108 elr->lr_sbi = sbi;
3109 elr->lr_next_group = start;
3110
3111 /*
3112 * Randomize first schedule time of the request to
3113 * spread the inode table initialization requests
3114 * better.
3115 */
dd1f723b
TT		 3116 elr->lr_next_sched = jiffies + (prandom_u32() %
3117 (EXT4_DEF_LI_MAX_START_DELAY * HZ));
bfff6873
LC		 3118 return elr;
3119}
3120
7f511862
TT		 3121int ext4_register_li_request(struct super_block *sb,
3122 ext4_group_t first_not_zeroed)
bfff6873
LC		 3123{
3124 struct ext4_sb_info *sbi = EXT4_SB(sb);
7f511862 3125 struct ext4_li_request *elr = NULL;
bfff6873 3126 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
6c5a6cb9 3127 int ret = 0;
bfff6873 3128
7f511862 3129 mutex_lock(&ext4_li_mtx);
51ce6511
LC		 3130 if (sbi->s_li_request != NULL) {
3131 /*
3132 * Reset timeout so it can be computed again, because
3133 * s_li_wait_mult might have changed.
3134 */
3135 sbi->s_li_request->lr_timeout = 0;
7f511862 3136 goto out;
51ce6511 3137 }
bfff6873
LC		 3138
3139 if (first_not_zeroed == ngroups ||
3140 (sb->s_flags & MS_RDONLY) ||
55ff3840 3141 !test_opt(sb, INIT_INODE_TABLE))
7f511862 3142 goto out;
bfff6873
LC		 3143
3144 elr = ext4_li_request_new(sb, first_not_zeroed);
7f511862
TT		 3145 if (!elr) {
3146 ret = -ENOMEM;
3147 goto out;
3148 }
bfff6873
LC		 3149
3150 if (NULL == ext4_li_info) {
3151 ret = ext4_li_info_new();
3152 if (ret)
3153 goto out;
3154 }
3155
3156 mutex_lock(&ext4_li_info->li_list_mtx);
3157 list_add(&elr->lr_request, &ext4_li_info->li_request_list);
3158 mutex_unlock(&ext4_li_info->li_list_mtx);
3159
3160 sbi->s_li_request = elr;
46e4690b
TM		 3161 /*
3162 * set elr to NULL here since it has been inserted to
3163 * the request_list and the removal and free of it is
3164 * handled by ext4_clear_request_list from now on.
3165 */
3166 elr = NULL;
bfff6873
LC		 3167
3168 if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) {
3169 ret = ext4_run_lazyinit_thread();
3170 if (ret)
3171 goto out;
3172 }
bfff6873 3173out:
beed5ecb
NK		 3174 mutex_unlock(&ext4_li_mtx);
3175 if (ret)
bfff6873 3176 kfree(elr);
bfff6873
LC		 3177 return ret;
3178}
3179
3180/*
3181 * We do not need to lock anything since this is called on
3182 * module unload.
3183 */
3184static void ext4_destroy_lazyinit_thread(void)
3185{
3186 /*
3187 * If thread exited earlier
3188 * there's nothing to be done.
3189 */
8f1f7453 3190 if (!ext4_li_info || !ext4_lazyinit_task)
bfff6873
LC		 3191 return;
3192
8f1f7453 3193 kthread_stop(ext4_lazyinit_task);
bfff6873
LC		 3194}
3195
25ed6e8a
DW		 3196static int set_journal_csum_feature_set(struct super_block *sb)
3197{
3198 int ret = 1;
3199 int compat, incompat;
3200 struct ext4_sb_info *sbi = EXT4_SB(sb);
3201
9aa5d32b 3202 if (ext4_has_metadata_csum(sb)) {
db9ee220 3203 /* journal checksum v3 */
25ed6e8a 3204 compat = 0;
db9ee220 3205 incompat = JBD2_FEATURE_INCOMPAT_CSUM_V3;
25ed6e8a
DW		 3206 } else {
3207 /* journal checksum v1 */
3208 compat = JBD2_FEATURE_COMPAT_CHECKSUM;
3209 incompat = 0;
3210 }
3211
feb8c6d3
DW		 3212 jbd2_journal_clear_features(sbi->s_journal,
3213 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
3214 JBD2_FEATURE_INCOMPAT_CSUM_V3 |
3215 JBD2_FEATURE_INCOMPAT_CSUM_V2);
25ed6e8a
DW		 3216 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
3217 ret = jbd2_journal_set_features(sbi->s_journal,
3218 compat, 0,
3219 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT |
3220 incompat);
3221 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
3222 ret = jbd2_journal_set_features(sbi->s_journal,
3223 compat, 0,
3224 incompat);
3225 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
3226 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
3227 } else {
feb8c6d3
DW		 3228 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
3229 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
25ed6e8a
DW		 3230 }
3231
3232 return ret;
3233}
3234
952fc18e
TT		 3235/*
3236 * Note: calculating the overhead so we can be compatible with
3237 * historical BSD practice is quite difficult in the face of
3238 * clusters/bigalloc. This is because multiple metadata blocks from
3239 * different block group can end up in the same allocation cluster.
3240 * Calculating the exact overhead in the face of clustered allocation
3241 * requires either O(all block bitmaps) in memory or O(number of block
3242 * groups**2) in time. We will still calculate the superblock for
3243 * older file systems --- and if we come across with a bigalloc file
3244 * system with zero in s_overhead_clusters the estimate will be close to
3245 * correct especially for very large cluster sizes --- but for newer
3246 * file systems, it's better to calculate this figure once at mkfs
3247 * time, and store it in the superblock. If the superblock value is
3248 * present (even for non-bigalloc file systems), we will use it.
3249 */
3250static int count_overhead(struct super_block *sb, ext4_group_t grp,
3251 char *buf)
3252{
3253 struct ext4_sb_info *sbi = EXT4_SB(sb);
3254 struct ext4_group_desc *gdp;
3255 ext4_fsblk_t first_block, last_block, b;
3256 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3257 int s, j, count = 0;
3258
0548bbb8
TT		 3259 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_BIGALLOC))
3260 return (ext4_bg_has_super(sb, grp) + ext4_bg_num_gdb(sb, grp) +
3261 sbi->s_itb_per_group + 2);
3262
952fc18e
TT		 3263 first_block = le32_to_cpu(sbi->s_es->s_first_data_block) +
3264 (grp * EXT4_BLOCKS_PER_GROUP(sb));
3265 last_block = first_block + EXT4_BLOCKS_PER_GROUP(sb) - 1;
3266 for (i = 0; i < ngroups; i++) {
3267 gdp = ext4_get_group_desc(sb, i, NULL);
3268 b = ext4_block_bitmap(sb, gdp);
3269 if (b >= first_block && b <= last_block) {
3270 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3271 count++;
3272 }
3273 b = ext4_inode_bitmap(sb, gdp);
3274 if (b >= first_block && b <= last_block) {
3275 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3276 count++;
3277 }
3278 b = ext4_inode_table(sb, gdp);
3279 if (b >= first_block && b + sbi->s_itb_per_group <= last_block)
3280 for (j = 0; j < sbi->s_itb_per_group; j++, b++) {
3281 int c = EXT4_B2C(sbi, b - first_block);
3282 ext4_set_bit(c, buf);
3283 count++;
3284 }
3285 if (i != grp)
3286 continue;
3287 s = 0;
3288 if (ext4_bg_has_super(sb, grp)) {
3289 ext4_set_bit(s++, buf);
3290 count++;
3291 }
3292 for (j = ext4_bg_num_gdb(sb, grp); j > 0; j--) {
3293 ext4_set_bit(EXT4_B2C(sbi, s++), buf);
3294 count++;
3295 }
3296 }
3297 if (!count)
3298 return 0;
3299 return EXT4_CLUSTERS_PER_GROUP(sb) -
3300 ext4_count_free(buf, EXT4_CLUSTERS_PER_GROUP(sb) / 8);
3301}
3302
3303/*
3304 * Compute the overhead and stash it in sbi->s_overhead
3305 */
3306int ext4_calculate_overhead(struct super_block *sb)
3307{
3308 struct ext4_sb_info *sbi = EXT4_SB(sb);
3309 struct ext4_super_block *es = sbi->s_es;
3310 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3311 ext4_fsblk_t overhead = 0;
4fdb5543 3312 char *buf = (char *) get_zeroed_page(GFP_NOFS);
952fc18e 3313
952fc18e
TT		 3314 if (!buf)
3315 return -ENOMEM;
3316
3317 /*
3318 * Compute the overhead (FS structures). This is constant
3319 * for a given filesystem unless the number of block groups
3320 * changes so we cache the previous value until it does.
3321 */
3322
3323 /*
3324 * All of the blocks before first_data_block are overhead
3325 */
3326 overhead = EXT4_B2C(sbi, le32_to_cpu(es->s_first_data_block));
3327
3328 /*
3329 * Add the overhead found in each block group
3330 */
3331 for (i = 0; i < ngroups; i++) {
3332 int blks;
3333
3334 blks = count_overhead(sb, i, buf);
3335 overhead += blks;
3336 if (blks)
3337 memset(buf, 0, PAGE_SIZE);
3338 cond_resched();
3339 }
b003b524
ES		 3340 /* Add the internal journal blocks as well */
3341 if (sbi->s_journal && !sbi->journal_bdev)
810da240 3342 overhead += EXT4_NUM_B2C(sbi, sbi->s_journal->j_maxlen);
0875a2b4 3343
952fc18e
TT		 3344 sbi->s_overhead = overhead;
3345 smp_wmb();
3346 free_page((unsigned long) buf);
3347 return 0;
3348}
3349
27dd4385 3350
30fac0f7 3351static ext4_fsblk_t ext4_calculate_resv_clusters(struct super_block *sb)
27dd4385
LC		 3352{
3353 ext4_fsblk_t resv_clusters;
3354
30fac0f7
JK		 3355 /*
3356 * There's no need to reserve anything when we aren't using extents.
3357 * The space estimates are exact, there are no unwritten extents,
3358 * hole punching doesn't need new metadata... This is needed especially
3359 * to keep ext2/3 backward compatibility.
3360 */
3361 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS))
3362 return 0;
27dd4385
LC		 3363 /*
3364 * By default we reserve 2% or 4096 clusters, whichever is smaller.
3365 * This should cover the situations where we can not afford to run
3366 * out of space like for example punch hole, or converting
556615dc 3367 * unwritten extents in delalloc path. In most cases such
27dd4385
LC		 3368 * allocation would require 1, or 2 blocks, higher numbers are
3369 * very rare.
3370 */
30fac0f7
JK		 3371 resv_clusters = ext4_blocks_count(EXT4_SB(sb)->s_es) >>
3372 EXT4_SB(sb)->s_cluster_bits;
27dd4385
LC		 3373
3374 do_div(resv_clusters, 50);
3375 resv_clusters = min_t(ext4_fsblk_t, resv_clusters, 4096);
3376
3377 return resv_clusters;
3378}
3379
3380
3381static int ext4_reserve_clusters(struct ext4_sb_info *sbi, ext4_fsblk_t count)
3382{
3383 ext4_fsblk_t clusters = ext4_blocks_count(sbi->s_es) >>
3384 sbi->s_cluster_bits;
3385
3386 if (count >= clusters)
3387 return -EINVAL;
3388
3389 atomic64_set(&sbi->s_resv_clusters, count);
3390 return 0;
3391}
3392
2b2d6d01 3393static int ext4_fill_super(struct super_block *sb, void *data, int silent)
ac27a0ec 3394{
d4c402d9 3395 char *orig_data = kstrdup(data, GFP_KERNEL);
2b2d6d01 3396 struct buffer_head *bh;
617ba13b
MC		 3397 struct ext4_super_block *es = NULL;
3398 struct ext4_sb_info *sbi;
3399 ext4_fsblk_t block;
3400 ext4_fsblk_t sb_block = get_sb_block(&data);
70bbb3e0 3401 ext4_fsblk_t logical_sb_block;
ac27a0ec 3402 unsigned long offset = 0;
ac27a0ec
DK		 3403 unsigned long journal_devnum = 0;
3404 unsigned long def_mount_opts;
3405 struct inode *root;
9f6200bb 3406 char *cp;
0390131b 3407 const char *descr;
dcc7dae3 3408 int ret = -ENOMEM;
281b5995 3409 int blocksize, clustersize;
4ec11028
TT		 3410 unsigned int db_count;
3411 unsigned int i;
281b5995 3412 int needs_recovery, has_huge_files, has_bigalloc;
bd81d8ee 3413 __u64 blocks_count;
07aa2ea1 3414 int err = 0;
b3881f74 3415 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
bfff6873 3416 ext4_group_t first_not_zeroed;
ac27a0ec
DK		 3417
3418 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
3419 if (!sbi)
dcc7dae3 3420 goto out_free_orig;
705895b6
PE		 3421
3422 sbi->s_blockgroup_lock =
3423 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
3424 if (!sbi->s_blockgroup_lock) {
3425 kfree(sbi);
dcc7dae3 3426 goto out_free_orig;
705895b6 3427 }
ac27a0ec 3428 sb->s_fs_info = sbi;
2c0544b2 3429 sbi->s_sb = sb;
240799cd 3430 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
d9c9bef1 3431 sbi->s_sb_block = sb_block;
f613dfcb
TT		 3432 if (sb->s_bdev->bd_part)
3433 sbi->s_sectors_written_start =
3434 part_stat_read(sb->s_bdev->bd_part, sectors[1]);
ac27a0ec 3435
9f6200bb
TT		 3436 /* Cleanup superblock name */
3437 for (cp = sb->s_id; (cp = strchr(cp, '/'));)
3438 *cp = '!';
3439
07aa2ea1 3440 /* -EINVAL is default */
dcc7dae3 3441 ret = -EINVAL;
617ba13b 3442 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
ac27a0ec 3443 if (!blocksize) {
b31e1552 3444 ext4_msg(sb, KERN_ERR, "unable to set blocksize");
ac27a0ec
DK		 3445 goto out_fail;
3446 }
3447
3448 /*
617ba13b 3449 * The ext4 superblock will not be buffer aligned for other than 1kB
ac27a0ec
DK		 3450 * block sizes. We need to calculate the offset from buffer start.
3451 */
617ba13b 3452 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
70bbb3e0
AM		 3453 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3454 offset = do_div(logical_sb_block, blocksize);
ac27a0ec 3455 } else {
70bbb3e0 3456 logical_sb_block = sb_block;
ac27a0ec
DK		 3457 }
3458
a8ac900b 3459 if (!(bh = sb_bread_unmovable(sb, logical_sb_block))) {
b31e1552 3460 ext4_msg(sb, KERN_ERR, "unable to read superblock");
ac27a0ec
DK		 3461 goto out_fail;
3462 }
3463 /*
3464 * Note: s_es must be initialized as soon as possible because
617ba13b 3465 * some ext4 macro-instructions depend on its value
ac27a0ec 3466 */
2716b802 3467 es = (struct ext4_super_block *) (bh->b_data + offset);
ac27a0ec
DK		 3468 sbi->s_es = es;
3469 sb->s_magic = le16_to_cpu(es->s_magic);
617ba13b
MC		 3470 if (sb->s_magic != EXT4_SUPER_MAGIC)
3471 goto cantfind_ext4;
afc32f7e 3472 sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
ac27a0ec 3473
feb0ab32
DW		 3474 /* Warn if metadata_csum and gdt_csum are both set. */
3475 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3476 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) &&
3477 EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_GDT_CSUM))
3478 ext4_warning(sb, KERN_INFO "metadata_csum and uninit_bg are "
3479 "redundant flags; please run fsck.");
3480
d25425f8
DW		 3481 /* Check for a known checksum algorithm */
3482 if (!ext4_verify_csum_type(sb, es)) {
3483 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3484 "unknown checksum algorithm.");
3485 silent = 1;
3486 goto cantfind_ext4;
3487 }
3488
0441984a
DW		 3489 /* Load the checksum driver */
3490 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3491 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) {
3492 sbi->s_chksum_driver = crypto_alloc_shash("crc32c", 0, 0);
3493 if (IS_ERR(sbi->s_chksum_driver)) {
3494 ext4_msg(sb, KERN_ERR, "Cannot load crc32c driver.");
3495 ret = PTR_ERR(sbi->s_chksum_driver);
3496 sbi->s_chksum_driver = NULL;
3497 goto failed_mount;
3498 }
3499 }
3500
a9c47317
DW		 3501 /* Check superblock checksum */
3502 if (!ext4_superblock_csum_verify(sb, es)) {
3503 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3504 "invalid superblock checksum. Run e2fsck?");
3505 silent = 1;
3506 goto cantfind_ext4;
3507 }
3508
3509 /* Precompute checksum seed for all metadata */
9aa5d32b 3510 if (ext4_has_metadata_csum(sb))
a9c47317
DW		 3511 sbi->s_csum_seed = ext4_chksum(sbi, ~0, es->s_uuid,
3512 sizeof(es->s_uuid));
3513
ac27a0ec
DK		 3514 /* Set defaults before we parse the mount options */
3515 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
fd8c37ec 3516 set_opt(sb, INIT_INODE_TABLE);
617ba13b 3517 if (def_mount_opts & EXT4_DEFM_DEBUG)
fd8c37ec 3518 set_opt(sb, DEBUG);
87f26807 3519 if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
fd8c37ec 3520 set_opt(sb, GRPID);
617ba13b 3521 if (def_mount_opts & EXT4_DEFM_UID16)
fd8c37ec 3522 set_opt(sb, NO_UID32);
ea663336 3523 /* xattr user namespace & acls are now defaulted on */
ea663336 3524 set_opt(sb, XATTR_USER);
03010a33 3525#ifdef CONFIG_EXT4_FS_POSIX_ACL
ea663336 3526 set_opt(sb, POSIX_ACL);
2e7842b8 3527#endif
98c1a759
DW		 3528 /* don't forget to enable journal_csum when metadata_csum is enabled. */
3529 if (ext4_has_metadata_csum(sb))
3530 set_opt(sb, JOURNAL_CHECKSUM);
3531
617ba13b 3532 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
fd8c37ec 3533 set_opt(sb, JOURNAL_DATA);
617ba13b 3534 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
fd8c37ec 3535 set_opt(sb, ORDERED_DATA);
617ba13b 3536 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
fd8c37ec 3537 set_opt(sb, WRITEBACK_DATA);
617ba13b
MC		 3538
3539 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
fd8c37ec 3540 set_opt(sb, ERRORS_PANIC);
bb4f397a 3541 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
fd8c37ec 3542 set_opt(sb, ERRORS_CONT);
bb4f397a 3543 else
fd8c37ec 3544 set_opt(sb, ERRORS_RO);
45f1a9c3
DW		 3545 /* block_validity enabled by default; disable with noblock_validity */
3546 set_opt(sb, BLOCK_VALIDITY);
8b67f04a 3547 if (def_mount_opts & EXT4_DEFM_DISCARD)
fd8c37ec 3548 set_opt(sb, DISCARD);
ac27a0ec 3549
08cefc7a
EB		 3550 sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));
3551 sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid));
30773840
TT		 3552 sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
3553 sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
3554 sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
ac27a0ec 3555
8b67f04a 3556 if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0)
fd8c37ec 3557 set_opt(sb, BARRIER);
ac27a0ec 3558
dd919b98
AK		 3559 /*
3560 * enable delayed allocation by default
3561 * Use -o nodelalloc to turn it off
3562 */
bc0b75f7 3563 if (!IS_EXT3_SB(sb) && !IS_EXT2_SB(sb) &&
8b67f04a 3564 ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0))
fd8c37ec 3565 set_opt(sb, DELALLOC);
dd919b98 3566
51ce6511
LC		 3567 /*
3568 * set default s_li_wait_mult for lazyinit, for the case there is
3569 * no mount option specified.
3570 */
3571 sbi->s_li_wait_mult = EXT4_DEF_LI_WAIT_MULT;
3572
8b67f04a 3573 if (!parse_options((char *) sbi->s_es->s_mount_opts, sb,
661aa520 3574 &journal_devnum, &journal_ioprio, 0)) {
8b67f04a
TT		 3575 ext4_msg(sb, KERN_WARNING,
3576 "failed to parse options in superblock: %s",
3577 sbi->s_es->s_mount_opts);
3578 }
5a916be1 3579 sbi->s_def_mount_opt = sbi->s_mount_opt;
b3881f74 3580 if (!parse_options((char *) data, sb, &journal_devnum,
661aa520 3581 &journal_ioprio, 0))
ac27a0ec
DK		 3582 goto failed_mount;
3583
56889787
TT		 3584 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
3585 printk_once(KERN_WARNING "EXT4-fs: Warning: mounting "
3586 "with data=journal disables delayed "
3587 "allocation and O_DIRECT support!\n");
3588 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
3589 ext4_msg(sb, KERN_ERR, "can't mount with "
3590 "both data=journal and delalloc");
3591 goto failed_mount;
3592 }
3593 if (test_opt(sb, DIOREAD_NOLOCK)) {
3594 ext4_msg(sb, KERN_ERR, "can't mount with "
6ae6514b 3595 "both data=journal and dioread_nolock");
56889787
TT		 3596 goto failed_mount;
3597 }
3598 if (test_opt(sb, DELALLOC))
3599 clear_opt(sb, DELALLOC);
3600 }
3601
ac27a0ec 3602 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
482a7425 3603 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec 3604
617ba13b
MC		 3605 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
3606 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
3607 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
3608 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
b31e1552
ES		 3609 ext4_msg(sb, KERN_WARNING,
3610 "feature flags set on rev 0 fs, "
3611 "running e2fsck is recommended");
469108ff 3612
ed3654eb
TT		 3613 if (es->s_creator_os == cpu_to_le32(EXT4_OS_HURD)) {
3614 set_opt2(sb, HURD_COMPAT);
3615 if (EXT4_HAS_INCOMPAT_FEATURE(sb,
3616 EXT4_FEATURE_INCOMPAT_64BIT)) {
3617 ext4_msg(sb, KERN_ERR,
3618 "The Hurd can't support 64-bit file systems");
3619 goto failed_mount;
3620 }
3621 }
3622
2035e776
TT		 3623 if (IS_EXT2_SB(sb)) {
3624 if (ext2_feature_set_ok(sb))
3625 ext4_msg(sb, KERN_INFO, "mounting ext2 file system "
3626 "using the ext4 subsystem");
3627 else {
3628 ext4_msg(sb, KERN_ERR, "couldn't mount as ext2 due "
3629 "to feature incompatibilities");
3630 goto failed_mount;
3631 }
3632 }
3633
3634 if (IS_EXT3_SB(sb)) {
3635 if (ext3_feature_set_ok(sb))
3636 ext4_msg(sb, KERN_INFO, "mounting ext3 file system "
3637 "using the ext4 subsystem");
3638 else {
3639 ext4_msg(sb, KERN_ERR, "couldn't mount as ext3 due "
3640 "to feature incompatibilities");
3641 goto failed_mount;
3642 }
3643 }
3644
ac27a0ec
DK		 3645 /*
3646 * Check feature flags regardless of the revision level, since we
3647 * previously didn't change the revision level when setting the flags,
3648 * so there is a chance incompat flags are set on a rev 0 filesystem.
3649 */
a13fb1a4 3650 if (!ext4_feature_set_ok(sb, (sb->s_flags & MS_RDONLY)))
ac27a0ec 3651 goto failed_mount;
a13fb1a4 3652
261cb20c 3653 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
617ba13b
MC		 3654 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
3655 blocksize > EXT4_MAX_BLOCK_SIZE) {
b31e1552
ES		 3656 ext4_msg(sb, KERN_ERR,
3657 "Unsupported filesystem blocksize %d", blocksize);
ac27a0ec
DK		 3658 goto failed_mount;
3659 }
3660
ac27a0ec 3661 if (sb->s_blocksize != blocksize) {
ce40733c
AK		 3662 /* Validate the filesystem blocksize */
3663 if (!sb_set_blocksize(sb, blocksize)) {
b31e1552 3664 ext4_msg(sb, KERN_ERR, "bad block size %d",
ce40733c 3665 blocksize);
ac27a0ec
DK		 3666 goto failed_mount;
3667 }
3668
2b2d6d01 3669 brelse(bh);
70bbb3e0
AM		 3670 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3671 offset = do_div(logical_sb_block, blocksize);
a8ac900b 3672 bh = sb_bread_unmovable(sb, logical_sb_block);
ac27a0ec 3673 if (!bh) {
b31e1552
ES		 3674 ext4_msg(sb, KERN_ERR,
3675 "Can't read superblock on 2nd try");
ac27a0ec
DK		 3676 goto failed_mount;
3677 }
2716b802 3678 es = (struct ext4_super_block *)(bh->b_data + offset);
ac27a0ec 3679 sbi->s_es = es;
617ba13b 3680 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
b31e1552
ES		 3681 ext4_msg(sb, KERN_ERR,
3682 "Magic mismatch, very weird!");
ac27a0ec
DK		 3683 goto failed_mount;
3684 }
3685 }
3686
a13fb1a4
ES		 3687 has_huge_files = EXT4_HAS_RO_COMPAT_FEATURE(sb,
3688 EXT4_FEATURE_RO_COMPAT_HUGE_FILE);
f287a1a5
TT		 3689 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
3690 has_huge_files);
3691 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
ac27a0ec 3692
617ba13b
MC		 3693 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
3694 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
3695 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
ac27a0ec
DK		 3696 } else {
3697 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
3698 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
617ba13b 3699 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
1330593e 3700 (!is_power_of_2(sbi->s_inode_size)) ||
ac27a0ec 3701 (sbi->s_inode_size > blocksize)) {
b31e1552
ES		 3702 ext4_msg(sb, KERN_ERR,
3703 "unsupported inode size: %d",
2b2d6d01 3704 sbi->s_inode_size);
ac27a0ec
DK		 3705 goto failed_mount;
3706 }
ef7f3835
KS		 3707 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
3708 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
ac27a0ec 3709 }
0b8e58a1 3710
0d1ee42f
AR		 3711 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
3712 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
8fadc143 3713 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
0d1ee42f 3714 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
d8ea6cf8 3715 !is_power_of_2(sbi->s_desc_size)) {
b31e1552
ES		 3716 ext4_msg(sb, KERN_ERR,
3717 "unsupported descriptor size %lu",
0d1ee42f
AR		 3718 sbi->s_desc_size);
3719 goto failed_mount;
3720 }
3721 } else
3722 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
0b8e58a1 3723
ac27a0ec 3724 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
ac27a0ec 3725 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
b47b6f38 3726 if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
617ba13b 3727 goto cantfind_ext4;
0b8e58a1 3728
617ba13b 3729 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
ac27a0ec 3730 if (sbi->s_inodes_per_block == 0)
617ba13b 3731 goto cantfind_ext4;
ac27a0ec
DK		 3732 sbi->s_itb_per_group = sbi->s_inodes_per_group /
3733 sbi->s_inodes_per_block;
0d1ee42f 3734 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
ac27a0ec
DK		 3735 sbi->s_sbh = bh;
3736 sbi->s_mount_state = le16_to_cpu(es->s_state);
e57aa839
FW		 3737 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
3738 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
0b8e58a1 3739
2b2d6d01 3740 for (i = 0; i < 4; i++)
ac27a0ec
DK		 3741 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
3742 sbi->s_def_hash_version = es->s_def_hash_version;
23301410
TT		 3743 if (EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_DIR_INDEX)) {
3744 i = le32_to_cpu(es->s_flags);
3745 if (i & EXT2_FLAGS_UNSIGNED_HASH)
3746 sbi->s_hash_unsigned = 3;
3747 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
f99b2589 3748#ifdef __CHAR_UNSIGNED__
23301410
TT		 3749 if (!(sb->s_flags & MS_RDONLY))
3750 es->s_flags |=
3751 cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
3752 sbi->s_hash_unsigned = 3;
f99b2589 3753#else
23301410
TT		 3754 if (!(sb->s_flags & MS_RDONLY))
3755 es->s_flags |=
3756 cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
f99b2589 3757#endif
23301410 3758 }
f99b2589 3759 }
ac27a0ec 3760
281b5995
TT		 3761 /* Handle clustersize */
3762 clustersize = BLOCK_SIZE << le32_to_cpu(es->s_log_cluster_size);
3763 has_bigalloc = EXT4_HAS_RO_COMPAT_FEATURE(sb,
3764 EXT4_FEATURE_RO_COMPAT_BIGALLOC);
3765 if (has_bigalloc) {
3766 if (clustersize < blocksize) {
3767 ext4_msg(sb, KERN_ERR,
3768 "cluster size (%d) smaller than "
3769 "block size (%d)", clustersize, blocksize);
3770 goto failed_mount;
3771 }
3772 sbi->s_cluster_bits = le32_to_cpu(es->s_log_cluster_size) -
3773 le32_to_cpu(es->s_log_block_size);
3774 sbi->s_clusters_per_group =
3775 le32_to_cpu(es->s_clusters_per_group);
3776 if (sbi->s_clusters_per_group > blocksize * 8) {
3777 ext4_msg(sb, KERN_ERR,
3778 "#clusters per group too big: %lu",
3779 sbi->s_clusters_per_group);
3780 goto failed_mount;
3781 }
3782 if (sbi->s_blocks_per_group !=
3783 (sbi->s_clusters_per_group * (clustersize / blocksize))) {
3784 ext4_msg(sb, KERN_ERR, "blocks per group (%lu) and "
3785 "clusters per group (%lu) inconsistent",
3786 sbi->s_blocks_per_group,
3787 sbi->s_clusters_per_group);
3788 goto failed_mount;
3789 }
3790 } else {
3791 if (clustersize != blocksize) {
3792 ext4_warning(sb, "fragment/cluster size (%d) != "
3793 "block size (%d)", clustersize,
3794 blocksize);
3795 clustersize = blocksize;
3796 }
3797 if (sbi->s_blocks_per_group > blocksize * 8) {
3798 ext4_msg(sb, KERN_ERR,
3799 "#blocks per group too big: %lu",
3800 sbi->s_blocks_per_group);
3801 goto failed_mount;
3802 }
3803 sbi->s_clusters_per_group = sbi->s_blocks_per_group;
3804 sbi->s_cluster_bits = 0;
ac27a0ec 3805 }
281b5995
TT		 3806 sbi->s_cluster_ratio = clustersize / blocksize;
3807
ac27a0ec 3808 if (sbi->s_inodes_per_group > blocksize * 8) {
b31e1552
ES		 3809 ext4_msg(sb, KERN_ERR,
3810 "#inodes per group too big: %lu",
2b2d6d01 3811 sbi->s_inodes_per_group);
ac27a0ec
DK		 3812 goto failed_mount;
3813 }
3814
960fd856
TT		 3815 /* Do we have standard group size of clustersize * 8 blocks ? */
3816 if (sbi->s_blocks_per_group == clustersize << 3)
3817 set_opt2(sb, STD_GROUP_SIZE);
3818
bf43d84b
ES		 3819 /*
3820 * Test whether we have more sectors than will fit in sector_t,
3821 * and whether the max offset is addressable by the page cache.
3822 */
5a9ae68a 3823 err = generic_check_addressable(sb->s_blocksize_bits,
30ca22c7 3824 ext4_blocks_count(es));
5a9ae68a 3825 if (err) {
b31e1552 3826 ext4_msg(sb, KERN_ERR, "filesystem"
bf43d84b 3827 " too large to mount safely on this system");
ac27a0ec 3828 if (sizeof(sector_t) < 8)
90c699a9 3829 ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled");
ac27a0ec
DK		 3830 goto failed_mount;
3831 }
3832
617ba13b
MC		 3833 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
3834 goto cantfind_ext4;
e7c95593 3835
0f2ddca6
FTN		 3836 /* check blocks count against device size */
3837 blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
3838 if (blocks_count && ext4_blocks_count(es) > blocks_count) {
b31e1552
ES		 3839 ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
3840 "exceeds size of device (%llu blocks)",
0f2ddca6
FTN		 3841 ext4_blocks_count(es), blocks_count);
3842 goto failed_mount;
3843 }
3844
0b8e58a1
AD		 3845 /*
3846 * It makes no sense for the first data block to be beyond the end
3847 * of the filesystem.
3848 */
3849 if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
5635a62b 3850 ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
b31e1552
ES		 3851 "block %u is beyond end of filesystem (%llu)",
3852 le32_to_cpu(es->s_first_data_block),
3853 ext4_blocks_count(es));
e7c95593
ES		 3854 goto failed_mount;
3855 }
bd81d8ee
LV		 3856 blocks_count = (ext4_blocks_count(es) -
3857 le32_to_cpu(es->s_first_data_block) +
3858 EXT4_BLOCKS_PER_GROUP(sb) - 1);
3859 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
4ec11028 3860 if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
b31e1552 3861 ext4_msg(sb, KERN_WARNING, "groups count too large: %u "
4ec11028 3862 "(block count %llu, first data block %u, "
b31e1552 3863 "blocks per group %lu)", sbi->s_groups_count,
4ec11028
TT		 3864 ext4_blocks_count(es),
3865 le32_to_cpu(es->s_first_data_block),
3866 EXT4_BLOCKS_PER_GROUP(sb));
3867 goto failed_mount;
3868 }
bd81d8ee 3869 sbi->s_groups_count = blocks_count;
fb0a387d
ES		 3870 sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
3871 (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
617ba13b
MC		 3872 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
3873 EXT4_DESC_PER_BLOCK(sb);
f18a5f21
TT		 3874 sbi->s_group_desc = ext4_kvmalloc(db_count *
3875 sizeof(struct buffer_head *),
3876 GFP_KERNEL);
ac27a0ec 3877 if (sbi->s_group_desc == NULL) {
b31e1552 3878 ext4_msg(sb, KERN_ERR, "not enough memory");
2cde417d 3879 ret = -ENOMEM;
ac27a0ec
DK		 3880 goto failed_mount;
3881 }
3882
9f6200bb
TT		 3883 if (ext4_proc_root)
3884 sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);
240799cd 3885
66acdcf4
TT		 3886 if (sbi->s_proc)
3887 proc_create_data("options", S_IRUGO, sbi->s_proc,
3888 &ext4_seq_options_fops, sb);
3889
705895b6 3890 bgl_lock_init(sbi->s_blockgroup_lock);
ac27a0ec
DK		 3891
3892 for (i = 0; i < db_count; i++) {
70bbb3e0 3893 block = descriptor_loc(sb, logical_sb_block, i);
a8ac900b 3894 sbi->s_group_desc[i] = sb_bread_unmovable(sb, block);
ac27a0ec 3895 if (!sbi->s_group_desc[i]) {
b31e1552
ES		 3896 ext4_msg(sb, KERN_ERR,
3897 "can't read group descriptor %d", i);
ac27a0ec
DK		 3898 db_count = i;
3899 goto failed_mount2;
3900 }
3901 }
bfff6873 3902 if (!ext4_check_descriptors(sb, &first_not_zeroed)) {
b31e1552 3903 ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
f9ae9cf5 3904 goto failed_mount2;
ac27a0ec 3905 }
772cb7c8 3906
f9ae9cf5 3907 sbi->s_gdb_count = db_count;
ac27a0ec
DK		 3908 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
3909 spin_lock_init(&sbi->s_next_gen_lock);
3910
04496411
TM		 3911 init_timer(&sbi->s_err_report);
3912 sbi->s_err_report.function = print_daily_error_info;
3913 sbi->s_err_report.data = (unsigned long) sb;
3914
a75ae78f 3915 /* Register extent status tree shrinker */
eb68d0e2 3916 if (ext4_es_register_shrinker(sbi))
ce7e010a 3917 goto failed_mount3;
ce7e010a 3918
c9de560d 3919 sbi->s_stripe = ext4_get_stripe_size(sbi);
67a5da56 3920 sbi->s_extent_max_zeroout_kb = 32;
c9de560d 3921
f9ae9cf5
TT		 3922 /*
3923 * set up enough so that it can read an inode
3924 */
f6e63f90 3925 sb->s_op = &ext4_sops;
617ba13b
MC		 3926 sb->s_export_op = &ext4_export_ops;
3927 sb->s_xattr = ext4_xattr_handlers;
ac27a0ec 3928#ifdef CONFIG_QUOTA
617ba13b 3929 sb->dq_op = &ext4_quota_operations;
262b4662 3930 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA))
7c319d32 3931 sb->s_qcop = &ext4_qctl_sysfile_operations;
262b4662
JK		 3932 else
3933 sb->s_qcop = &ext4_qctl_operations;
ac27a0ec 3934#endif
f2fa2ffc
AK		 3935 memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
3936
ac27a0ec 3937 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
3b9d4ed2 3938 mutex_init(&sbi->s_orphan_lock);
ac27a0ec
DK		 3939
3940 sb->s_root = NULL;
3941
3942 needs_recovery = (es->s_last_orphan != 0 ||
617ba13b
MC		 3943 EXT4_HAS_INCOMPAT_FEATURE(sb,
3944 EXT4_FEATURE_INCOMPAT_RECOVER));
ac27a0ec 3945
c5e06d10
JL		 3946 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_MMP) &&
3947 !(sb->s_flags & MS_RDONLY))
3948 if (ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block)))
50460fe8 3949 goto failed_mount3a;
c5e06d10 3950
ac27a0ec
DK		 3951 /*
3952 * The first inode we look at is the journal inode. Don't try
3953 * root first: it may be modified in the journal!
3954 */
3955 if (!test_opt(sb, NOLOAD) &&
617ba13b
MC		 3956 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
3957 if (ext4_load_journal(sb, es, journal_devnum))
50460fe8 3958 goto failed_mount3a;
0390131b
FM		 3959 } else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) &&
3960 EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
b31e1552
ES		 3961 ext4_msg(sb, KERN_ERR, "required journal recovery "
3962 "suppressed and not mounted read-only");
744692dc 3963 goto failed_mount_wq;
ac27a0ec 3964 } else {
fd8c37ec 3965 clear_opt(sb, DATA_FLAGS);
0390131b
FM		 3966 sbi->s_journal = NULL;
3967 needs_recovery = 0;
3968 goto no_journal;
ac27a0ec
DK		 3969 }
3970
f32aaf2d 3971 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT) &&
eb40a09c
JS		 3972 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
3973 JBD2_FEATURE_INCOMPAT_64BIT)) {
b31e1552 3974 ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
744692dc 3975 goto failed_mount_wq;
eb40a09c
JS		 3976 }
3977
25ed6e8a
DW		 3978 if (!set_journal_csum_feature_set(sb)) {
3979 ext4_msg(sb, KERN_ERR, "Failed to set journal checksum "
3980 "feature set");
3981 goto failed_mount_wq;
d4da6c9c 3982 }
818d276c 3983
ac27a0ec
DK		 3984 /* We have now updated the journal if required, so we can
3985 * validate the data journaling mode. */
3986 switch (test_opt(sb, DATA_FLAGS)) {
3987 case 0:
3988 /* No mode set, assume a default based on the journal
63f57933
AM		 3989 * capabilities: ORDERED_DATA if the journal can
3990 * cope, else JOURNAL_DATA
3991 */
dab291af
MC		 3992 if (jbd2_journal_check_available_features
3993 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
fd8c37ec 3994 set_opt(sb, ORDERED_DATA);
ac27a0ec 3995 else
fd8c37ec 3996 set_opt(sb, JOURNAL_DATA);
ac27a0ec
DK		 3997 break;
3998
617ba13b
MC		 3999 case EXT4_MOUNT_ORDERED_DATA:
4000 case EXT4_MOUNT_WRITEBACK_DATA:
dab291af
MC		 4001 if (!jbd2_journal_check_available_features
4002 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
b31e1552
ES		 4003 ext4_msg(sb, KERN_ERR, "Journal does not support "
4004 "requested data journaling mode");
744692dc 4005 goto failed_mount_wq;
ac27a0ec
DK		 4006 }
4007 default:
4008 break;
4009 }
b3881f74 4010 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
ac27a0ec 4011
18aadd47
BJ		 4012 sbi->s_journal->j_commit_callback = ext4_journal_commit_callback;
4013
ce7e010a 4014no_journal:
9c191f70
M		 4015 if (ext4_mballoc_ready) {
4016 sbi->s_mb_cache = ext4_xattr_create_cache(sb->s_id);
4017 if (!sbi->s_mb_cache) {
4018 ext4_msg(sb, KERN_ERR, "Failed to create an mb_cache");
4019 goto failed_mount_wq;
4020 }
4021 }
4022
952fc18e
TT		 4023 /*
4024 * Get the # of file system overhead blocks from the
4025 * superblock if present.
4026 */
4027 if (es->s_overhead_clusters)
4028 sbi->s_overhead = le32_to_cpu(es->s_overhead_clusters);
4029 else {
07aa2ea1
LC		 4030 err = ext4_calculate_overhead(sb);
4031 if (err)
952fc18e
TT		 4032 goto failed_mount_wq;
4033 }
4034
fd89d5f2
TH		 4035 /*
4036 * The maximum number of concurrent works can be high and
4037 * concurrency isn't really necessary. Limit it to 1.
4038 */
2e8fa54e
JK		 4039 EXT4_SB(sb)->rsv_conversion_wq =
4040 alloc_workqueue("ext4-rsv-conversion", WQ_MEM_RECLAIM | WQ_UNBOUND, 1);
4041 if (!EXT4_SB(sb)->rsv_conversion_wq) {
4042 printk(KERN_ERR "EXT4-fs: failed to create workqueue\n");
07aa2ea1 4043 ret = -ENOMEM;
2e8fa54e
JK		 4044 goto failed_mount4;
4045 }
4046
ac27a0ec 4047 /*
dab291af 4048 * The jbd2_journal_load will have done any necessary log recovery,
ac27a0ec
DK		 4049 * so we can safely mount the rest of the filesystem now.
4050 */
4051
1d1fe1ee
DH		 4052 root = ext4_iget(sb, EXT4_ROOT_INO);
4053 if (IS_ERR(root)) {
b31e1552 4054 ext4_msg(sb, KERN_ERR, "get root inode failed");
1d1fe1ee 4055 ret = PTR_ERR(root);
32a9bb57 4056 root = NULL;
ac27a0ec
DK		 4057 goto failed_mount4;
4058 }
4059 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
b31e1552 4060 ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
94bf608a 4061 iput(root);
ac27a0ec
DK		 4062 goto failed_mount4;
4063 }
48fde701 4064 sb->s_root = d_make_root(root);
1d1fe1ee 4065 if (!sb->s_root) {
b31e1552 4066 ext4_msg(sb, KERN_ERR, "get root dentry failed");
1d1fe1ee
DH		 4067 ret = -ENOMEM;
4068 goto failed_mount4;
4069 }
ac27a0ec 4070
7e84b621
ES		 4071 if (ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY))
4072 sb->s_flags |= MS_RDONLY;
ef7f3835
KS		 4073
4074 /* determine the minimum size of new large inodes, if present */
4075 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
4076 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
4077 EXT4_GOOD_OLD_INODE_SIZE;
4078 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
4079 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) {
4080 if (sbi->s_want_extra_isize <
4081 le16_to_cpu(es->s_want_extra_isize))
4082 sbi->s_want_extra_isize =
4083 le16_to_cpu(es->s_want_extra_isize);
4084 if (sbi->s_want_extra_isize <
4085 le16_to_cpu(es->s_min_extra_isize))
4086 sbi->s_want_extra_isize =
4087 le16_to_cpu(es->s_min_extra_isize);
4088 }
4089 }
4090 /* Check if enough inode space is available */
4091 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
4092 sbi->s_inode_size) {
4093 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
4094 EXT4_GOOD_OLD_INODE_SIZE;
b31e1552
ES		 4095 ext4_msg(sb, KERN_INFO, "required extra inode space not"
4096 "available");
ef7f3835
KS		 4097 }
4098
30fac0f7 4099 err = ext4_reserve_clusters(sbi, ext4_calculate_resv_clusters(sb));
27dd4385
LC		 4100 if (err) {
4101 ext4_msg(sb, KERN_ERR, "failed to reserve %llu clusters for "
30fac0f7 4102 "reserved pool", ext4_calculate_resv_clusters(sb));
f9ae9cf5 4103 goto failed_mount4a;
27dd4385
LC		 4104 }
4105
6fd058f7
TT		 4106 err = ext4_setup_system_zone(sb);
4107 if (err) {
b31e1552 4108 ext4_msg(sb, KERN_ERR, "failed to initialize system "
fbe845dd 4109 "zone (%d)", err);
f9ae9cf5
TT		 4110 goto failed_mount4a;
4111 }
4112
4113 ext4_ext_init(sb);
4114 err = ext4_mb_init(sb);
4115 if (err) {
4116 ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)",
4117 err);
dcf2d804 4118 goto failed_mount5;
c2774d84
AK		 4119 }
4120
d5e03cbb
TT		 4121 block = ext4_count_free_clusters(sb);
4122 ext4_free_blocks_count_set(sbi->s_es,
4123 EXT4_C2B(sbi, block));
908c7f19
TH		 4124 err = percpu_counter_init(&sbi->s_freeclusters_counter, block,
4125 GFP_KERNEL);
d5e03cbb
TT		 4126 if (!err) {
4127 unsigned long freei = ext4_count_free_inodes(sb);
4128 sbi->s_es->s_free_inodes_count = cpu_to_le32(freei);
908c7f19
TH		 4129 err = percpu_counter_init(&sbi->s_freeinodes_counter, freei,
4130 GFP_KERNEL);
d5e03cbb
TT		 4131 }
4132 if (!err)
4133 err = percpu_counter_init(&sbi->s_dirs_counter,
908c7f19 4134 ext4_count_dirs(sb), GFP_KERNEL);
d5e03cbb 4135 if (!err)
908c7f19
TH		 4136 err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0,
4137 GFP_KERNEL);
d5e03cbb
TT		 4138 if (err) {
4139 ext4_msg(sb, KERN_ERR, "insufficient memory");
4140 goto failed_mount6;
4141 }
4142
4143 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
4144 if (!ext4_fill_flex_info(sb)) {
4145 ext4_msg(sb, KERN_ERR,
4146 "unable to initialize "
4147 "flex_bg meta info!");
4148 goto failed_mount6;
4149 }
4150
bfff6873
LC		 4151 err = ext4_register_li_request(sb, first_not_zeroed);
4152 if (err)
dcf2d804 4153 goto failed_mount6;
bfff6873 4154
3197ebdb
TT		 4155 sbi->s_kobj.kset = ext4_kset;
4156 init_completion(&sbi->s_kobj_unregister);
4157 err = kobject_init_and_add(&sbi->s_kobj, &ext4_ktype, NULL,
4158 "%s", sb->s_id);
dcf2d804
TM		 4159 if (err)
4160 goto failed_mount7;
3197ebdb 4161
9b2ff357
JK		 4162#ifdef CONFIG_QUOTA
4163 /* Enable quota usage during mount. */
4164 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) &&
4165 !(sb->s_flags & MS_RDONLY)) {
4166 err = ext4_enable_quotas(sb);
4167 if (err)
4168 goto failed_mount8;
4169 }
4170#endif /* CONFIG_QUOTA */
4171
617ba13b
MC		 4172 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
4173 ext4_orphan_cleanup(sb, es);
4174 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
0390131b 4175 if (needs_recovery) {
b31e1552 4176 ext4_msg(sb, KERN_INFO, "recovery complete");
0390131b
FM		 4177 ext4_mark_recovery_complete(sb, es);
4178 }
4179 if (EXT4_SB(sb)->s_journal) {
4180 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
4181 descr = " journalled data mode";
4182 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
4183 descr = " ordered data mode";
4184 else
4185 descr = " writeback data mode";
4186 } else
4187 descr = "out journal";
4188
79add3a3
LC		 4189 if (test_opt(sb, DISCARD)) {
4190 struct request_queue *q = bdev_get_queue(sb->s_bdev);
4191 if (!blk_queue_discard(q))
4192 ext4_msg(sb, KERN_WARNING,
4193 "mounting with \"discard\" option, but "
4194 "the device does not support discard");
4195 }
4196
d4c402d9 4197 ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. "
8b67f04a
TT		 4198 "Opts: %s%s%s", descr, sbi->s_es->s_mount_opts,
4199 *sbi->s_es->s_mount_opts ? "; " : "", orig_data);
ac27a0ec 4200
66e61a9e
TT		 4201 if (es->s_error_count)
4202 mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */
ac27a0ec 4203
efbed4dc
TT		 4204 /* Enable message ratelimiting. Default is 10 messages per 5 secs. */
4205 ratelimit_state_init(&sbi->s_err_ratelimit_state, 5 * HZ, 10);
4206 ratelimit_state_init(&sbi->s_warning_ratelimit_state, 5 * HZ, 10);
4207 ratelimit_state_init(&sbi->s_msg_ratelimit_state, 5 * HZ, 10);
4208
d4c402d9 4209 kfree(orig_data);
ac27a0ec
DK		 4210 return 0;
4211
617ba13b 4212cantfind_ext4:
ac27a0ec 4213 if (!silent)
b31e1552 4214 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
ac27a0ec
DK		 4215 goto failed_mount;
4216
72ba7450
TT		 4217#ifdef CONFIG_QUOTA
4218failed_mount8:
4219 kobject_del(&sbi->s_kobj);
4220#endif
dcf2d804
TM		 4221failed_mount7:
4222 ext4_unregister_li_request(sb);
4223failed_mount6:
f9ae9cf5 4224 ext4_mb_release(sb);
d5e03cbb 4225 if (sbi->s_flex_groups)
b93b41d4 4226 kvfree(sbi->s_flex_groups);
d5e03cbb
TT		 4227 percpu_counter_destroy(&sbi->s_freeclusters_counter);
4228 percpu_counter_destroy(&sbi->s_freeinodes_counter);
4229 percpu_counter_destroy(&sbi->s_dirs_counter);
4230 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
00764937 4231failed_mount5:
f9ae9cf5
TT		 4232 ext4_ext_release(sb);
4233 ext4_release_system_zone(sb);
4234failed_mount4a:
94bf608a 4235 dput(sb->s_root);
32a9bb57 4236 sb->s_root = NULL;
94bf608a 4237failed_mount4:
b31e1552 4238 ext4_msg(sb, KERN_ERR, "mount failed");
2e8fa54e
JK		 4239 if (EXT4_SB(sb)->rsv_conversion_wq)
4240 destroy_workqueue(EXT4_SB(sb)->rsv_conversion_wq);
4c0425ff 4241failed_mount_wq:
0390131b
FM		 4242 if (sbi->s_journal) {
4243 jbd2_journal_destroy(sbi->s_journal);
4244 sbi->s_journal = NULL;
4245 }
50460fe8 4246failed_mount3a:
d3922a77 4247 ext4_es_unregister_shrinker(sbi);
eb68d0e2 4248failed_mount3:
9105bb14 4249 del_timer_sync(&sbi->s_err_report);
c5e06d10
JL		 4250 if (sbi->s_mmp_tsk)
4251 kthread_stop(sbi->s_mmp_tsk);
ac27a0ec
DK		 4252failed_mount2:
4253 for (i = 0; i < db_count; i++)
4254 brelse(sbi->s_group_desc[i]);
b93b41d4 4255 kvfree(sbi->s_group_desc);
ac27a0ec 4256failed_mount:
0441984a
DW		 4257 if (sbi->s_chksum_driver)
4258 crypto_free_shash(sbi->s_chksum_driver);
240799cd 4259 if (sbi->s_proc) {
66acdcf4 4260 remove_proc_entry("options", sbi->s_proc);
9f6200bb 4261 remove_proc_entry(sb->s_id, ext4_proc_root);
240799cd 4262 }
ac27a0ec 4263#ifdef CONFIG_QUOTA
a2d4a646 4264 for (i = 0; i < EXT4_MAXQUOTAS; i++)
ac27a0ec
DK		 4265 kfree(sbi->s_qf_names[i]);
4266#endif
617ba13b 4267 ext4_blkdev_remove(sbi);
ac27a0ec
DK		 4268 brelse(bh);
4269out_fail:
4270 sb->s_fs_info = NULL;
f6830165 4271 kfree(sbi->s_blockgroup_lock);
ac27a0ec 4272 kfree(sbi);
dcc7dae3 4273out_free_orig:
d4c402d9 4274 kfree(orig_data);
07aa2ea1 4275 return err ? err : ret;
ac27a0ec
DK		 4276}
4277
4278/*
4279 * Setup any per-fs journal parameters now. We'll do this both on
4280 * initial mount, once the journal has been initialised but before we've
4281 * done any recovery; and again on any subsequent remount.
4282 */
617ba13b 4283static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
ac27a0ec 4284{
617ba13b 4285 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4286
30773840
TT		 4287 journal->j_commit_interval = sbi->s_commit_interval;
4288 journal->j_min_batch_time = sbi->s_min_batch_time;
4289 journal->j_max_batch_time = sbi->s_max_batch_time;
ac27a0ec 4290
a931da6a 4291 write_lock(&journal->j_state_lock);
ac27a0ec 4292 if (test_opt(sb, BARRIER))
dab291af 4293 journal->j_flags |= JBD2_BARRIER;
ac27a0ec 4294 else
dab291af 4295 journal->j_flags &= ~JBD2_BARRIER;
5bf5683a
HK		 4296 if (test_opt(sb, DATA_ERR_ABORT))
4297 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
4298 else
4299 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
a931da6a 4300 write_unlock(&journal->j_state_lock);
ac27a0ec
DK		 4301}
4302
617ba13b 4303static journal_t *ext4_get_journal(struct super_block *sb,
ac27a0ec
DK		 4304 unsigned int journal_inum)
4305{
4306 struct inode *journal_inode;
4307 journal_t *journal;
4308
0390131b
FM		 4309 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4310
ac27a0ec
DK		 4311 /* First, test for the existence of a valid inode on disk. Bad
4312 * things happen if we iget() an unused inode, as the subsequent
4313 * iput() will try to delete it. */
4314
1d1fe1ee
DH		 4315 journal_inode = ext4_iget(sb, journal_inum);
4316 if (IS_ERR(journal_inode)) {
b31e1552 4317 ext4_msg(sb, KERN_ERR, "no journal found");
ac27a0ec
DK		 4318 return NULL;
4319 }
4320 if (!journal_inode->i_nlink) {
4321 make_bad_inode(journal_inode);
4322 iput(journal_inode);
b31e1552 4323 ext4_msg(sb, KERN_ERR, "journal inode is deleted");
ac27a0ec
DK		 4324 return NULL;
4325 }
4326
e5f8eab8 4327 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
ac27a0ec 4328 journal_inode, journal_inode->i_size);
1d1fe1ee 4329 if (!S_ISREG(journal_inode->i_mode)) {
b31e1552 4330 ext4_msg(sb, KERN_ERR, "invalid journal inode");
ac27a0ec
DK		 4331 iput(journal_inode);
4332 return NULL;
4333 }
4334
dab291af 4335 journal = jbd2_journal_init_inode(journal_inode);
ac27a0ec 4336 if (!journal) {
b31e1552 4337 ext4_msg(sb, KERN_ERR, "Could not load journal inode");
ac27a0ec
DK		 4338 iput(journal_inode);
4339 return NULL;
4340 }
4341 journal->j_private = sb;
617ba13b 4342 ext4_init_journal_params(sb, journal);
ac27a0ec
DK		 4343 return journal;
4344}
4345
617ba13b 4346static journal_t *ext4_get_dev_journal(struct super_block *sb,
ac27a0ec
DK		 4347 dev_t j_dev)
4348{
2b2d6d01 4349 struct buffer_head *bh;
ac27a0ec 4350 journal_t *journal;
617ba13b
MC		 4351 ext4_fsblk_t start;
4352 ext4_fsblk_t len;
ac27a0ec 4353 int hblock, blocksize;
617ba13b 4354 ext4_fsblk_t sb_block;
ac27a0ec 4355 unsigned long offset;
2b2d6d01 4356 struct ext4_super_block *es;
ac27a0ec
DK		 4357 struct block_device *bdev;
4358
0390131b
FM		 4359 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4360
b31e1552 4361 bdev = ext4_blkdev_get(j_dev, sb);
ac27a0ec
DK		 4362 if (bdev == NULL)
4363 return NULL;
4364
ac27a0ec 4365 blocksize = sb->s_blocksize;
e1defc4f 4366 hblock = bdev_logical_block_size(bdev);
ac27a0ec 4367 if (blocksize < hblock) {
b31e1552
ES		 4368 ext4_msg(sb, KERN_ERR,
4369 "blocksize too small for journal device");
ac27a0ec
DK		 4370 goto out_bdev;
4371 }
4372
617ba13b
MC		 4373 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
4374 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
ac27a0ec
DK		 4375 set_blocksize(bdev, blocksize);
4376 if (!(bh = __bread(bdev, sb_block, blocksize))) {
b31e1552
ES		 4377 ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
4378 "external journal");
ac27a0ec
DK		 4379 goto out_bdev;
4380 }
4381
2716b802 4382 es = (struct ext4_super_block *) (bh->b_data + offset);
617ba13b 4383 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
ac27a0ec 4384 !(le32_to_cpu(es->s_feature_incompat) &
617ba13b 4385 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
b31e1552
ES		 4386 ext4_msg(sb, KERN_ERR, "external journal has "
4387 "bad superblock");
ac27a0ec
DK		 4388 brelse(bh);
4389 goto out_bdev;
4390 }
4391
df4763be
DW		 4392 if ((le32_to_cpu(es->s_feature_ro_compat) &
4393 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) &&
4394 es->s_checksum != ext4_superblock_csum(sb, es)) {
4395 ext4_msg(sb, KERN_ERR, "external journal has "
4396 "corrupt superblock");
4397 brelse(bh);
4398 goto out_bdev;
4399 }
4400
617ba13b 4401 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
b31e1552 4402 ext4_msg(sb, KERN_ERR, "journal UUID does not match");
ac27a0ec
DK		 4403 brelse(bh);
4404 goto out_bdev;
4405 }
4406
bd81d8ee 4407 len = ext4_blocks_count(es);
ac27a0ec
DK		 4408 start = sb_block + 1;
4409 brelse(bh); /* we're done with the superblock */
4410
dab291af 4411 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
ac27a0ec
DK		 4412 start, len, blocksize);
4413 if (!journal) {
b31e1552 4414 ext4_msg(sb, KERN_ERR, "failed to create device journal");
ac27a0ec
DK		 4415 goto out_bdev;
4416 }
4417 journal->j_private = sb;
9f203507 4418 ll_rw_block(READ | REQ_META | REQ_PRIO, 1, &journal->j_sb_buffer);
ac27a0ec
DK		 4419 wait_on_buffer(journal->j_sb_buffer);
4420 if (!buffer_uptodate(journal->j_sb_buffer)) {
b31e1552 4421 ext4_msg(sb, KERN_ERR, "I/O error on journal device");
ac27a0ec
DK		 4422 goto out_journal;
4423 }
4424 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
b31e1552
ES		 4425 ext4_msg(sb, KERN_ERR, "External journal has more than one "
4426 "user (unsupported) - %d",
ac27a0ec
DK		 4427 be32_to_cpu(journal->j_superblock->s_nr_users));
4428 goto out_journal;
4429 }
617ba13b
MC		 4430 EXT4_SB(sb)->journal_bdev = bdev;
4431 ext4_init_journal_params(sb, journal);
ac27a0ec 4432 return journal;
0b8e58a1 4433
ac27a0ec 4434out_journal:
dab291af 4435 jbd2_journal_destroy(journal);
ac27a0ec 4436out_bdev:
617ba13b 4437 ext4_blkdev_put(bdev);
ac27a0ec
DK		 4438 return NULL;
4439}
4440
617ba13b
MC		 4441static int ext4_load_journal(struct super_block *sb,
4442 struct ext4_super_block *es,
ac27a0ec
DK		 4443 unsigned long journal_devnum)
4444{
4445 journal_t *journal;
4446 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
4447 dev_t journal_dev;
4448 int err = 0;
4449 int really_read_only;
4450
0390131b
FM		 4451 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4452
ac27a0ec
DK		 4453 if (journal_devnum &&
4454 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
b31e1552
ES		 4455 ext4_msg(sb, KERN_INFO, "external journal device major/minor "
4456 "numbers have changed");
ac27a0ec
DK		 4457 journal_dev = new_decode_dev(journal_devnum);
4458 } else
4459 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
4460
4461 really_read_only = bdev_read_only(sb->s_bdev);
4462
4463 /*
4464 * Are we loading a blank journal or performing recovery after a
4465 * crash? For recovery, we need to check in advance whether we
4466 * can get read-write access to the device.
4467 */
617ba13b 4468 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
ac27a0ec 4469 if (sb->s_flags & MS_RDONLY) {
b31e1552
ES		 4470 ext4_msg(sb, KERN_INFO, "INFO: recovery "
4471 "required on readonly filesystem");
ac27a0ec 4472 if (really_read_only) {
b31e1552
ES		 4473 ext4_msg(sb, KERN_ERR, "write access "
4474 "unavailable, cannot proceed");
ac27a0ec
DK		 4475 return -EROFS;
4476 }
b31e1552
ES		 4477 ext4_msg(sb, KERN_INFO, "write access will "
4478 "be enabled during recovery");
ac27a0ec
DK		 4479 }
4480 }
4481
4482 if (journal_inum && journal_dev) {
b31e1552
ES		 4483 ext4_msg(sb, KERN_ERR, "filesystem has both journal "
4484 "and inode journals!");
ac27a0ec
DK		 4485 return -EINVAL;
4486 }
4487
4488 if (journal_inum) {
617ba13b 4489 if (!(journal = ext4_get_journal(sb, journal_inum)))
ac27a0ec
DK		 4490 return -EINVAL;
4491 } else {
617ba13b 4492 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
ac27a0ec
DK		 4493 return -EINVAL;
4494 }
4495
90576c0b 4496 if (!(journal->j_flags & JBD2_BARRIER))
b31e1552 4497 ext4_msg(sb, KERN_INFO, "barriers disabled");
4776004f 4498
617ba13b 4499 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
dab291af 4500 err = jbd2_journal_wipe(journal, !really_read_only);
1c13d5c0
TT		 4501 if (!err) {
4502 char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL);
4503 if (save)
4504 memcpy(save, ((char *) es) +
4505 EXT4_S_ERR_START, EXT4_S_ERR_LEN);
dab291af 4506 err = jbd2_journal_load(journal);
1c13d5c0
TT		 4507 if (save)
4508 memcpy(((char *) es) + EXT4_S_ERR_START,
4509 save, EXT4_S_ERR_LEN);
4510 kfree(save);
4511 }
ac27a0ec
DK		 4512
4513 if (err) {
b31e1552 4514 ext4_msg(sb, KERN_ERR, "error loading journal");
dab291af 4515 jbd2_journal_destroy(journal);
ac27a0ec
DK		 4516 return err;
4517 }
4518
617ba13b
MC		 4519 EXT4_SB(sb)->s_journal = journal;
4520 ext4_clear_journal_err(sb, es);
ac27a0ec 4521
c41303ce 4522 if (!really_read_only && journal_devnum &&
ac27a0ec
DK		 4523 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
4524 es->s_journal_dev = cpu_to_le32(journal_devnum);
ac27a0ec
DK		 4525
4526 /* Make sure we flush the recovery flag to disk. */
e2d67052 4527 ext4_commit_super(sb, 1);
ac27a0ec
DK		 4528 }
4529
4530 return 0;
4531}
4532
e2d67052 4533static int ext4_commit_super(struct super_block *sb, int sync)
ac27a0ec 4534{
e2d67052 4535 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
617ba13b 4536 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
c4be0c1d 4537 int error = 0;
ac27a0ec 4538
7c2e7087 4539 if (!sbh || block_device_ejected(sb))
c4be0c1d 4540 return error;
914258bf
TT		 4541 if (buffer_write_io_error(sbh)) {
4542 /*
4543 * Oh, dear. A previous attempt to write the
4544 * superblock failed. This could happen because the
4545 * USB device was yanked out. Or it could happen to
4546 * be a transient write error and maybe the block will
4547 * be remapped. Nothing we can do but to retry the
4548 * write and hope for the best.
4549 */
b31e1552
ES		 4550 ext4_msg(sb, KERN_ERR, "previous I/O error to "
4551 "superblock detected");
914258bf
TT		 4552 clear_buffer_write_io_error(sbh);
4553 set_buffer_uptodate(sbh);
4554 }
71290b36
TT		 4555 /*
4556 * If the file system is mounted read-only, don't update the
4557 * superblock write time. This avoids updating the superblock
4558 * write time when we are mounting the root file system
4559 * read/only but we need to replay the journal; at that point,
4560 * for people who are east of GMT and who make their clock
4561 * tick in localtime for Windows bug-for-bug compatibility,
4562 * the clock is set in the future, and this will cause e2fsck
4563 * to complain and force a full file system check.
4564 */
4565 if (!(sb->s_flags & MS_RDONLY))
4566 es->s_wtime = cpu_to_le32(get_seconds());
f613dfcb
TT		 4567 if (sb->s_bdev->bd_part)
4568 es->s_kbytes_written =
4569 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written +
afc32f7e
TT		 4570 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
4571 EXT4_SB(sb)->s_sectors_written_start) >> 1));
f613dfcb
TT		 4572 else
4573 es->s_kbytes_written =
4574 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written);
d5e03cbb
TT		 4575 if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeclusters_counter))
4576 ext4_free_blocks_count_set(es,
57042651
TT		 4577 EXT4_C2B(EXT4_SB(sb), percpu_counter_sum_positive(
4578 &EXT4_SB(sb)->s_freeclusters_counter)));
d5e03cbb
TT		 4579 if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeinodes_counter))
4580 es->s_free_inodes_count =
4581 cpu_to_le32(percpu_counter_sum_positive(
ce7e010a 4582 &EXT4_SB(sb)->s_freeinodes_counter));
ac27a0ec 4583 BUFFER_TRACE(sbh, "marking dirty");
06db49e6 4584 ext4_superblock_csum_set(sb);
ac27a0ec 4585 mark_buffer_dirty(sbh);
914258bf 4586 if (sync) {
c4be0c1d
TS		 4587 error = sync_dirty_buffer(sbh);
4588 if (error)
4589 return error;
4590
4591 error = buffer_write_io_error(sbh);
4592 if (error) {
b31e1552
ES		 4593 ext4_msg(sb, KERN_ERR, "I/O error while writing "
4594 "superblock");
914258bf
TT		 4595 clear_buffer_write_io_error(sbh);
4596 set_buffer_uptodate(sbh);
4597 }
4598 }
c4be0c1d 4599 return error;
ac27a0ec
DK		 4600}
4601
ac27a0ec
DK		 4602/*
4603 * Have we just finished recovery? If so, and if we are mounting (or
4604 * remounting) the filesystem readonly, then we will end up with a
4605 * consistent fs on disk. Record that fact.
4606 */
2b2d6d01
TT		 4607static void ext4_mark_recovery_complete(struct super_block *sb,
4608 struct ext4_super_block *es)
ac27a0ec 4609{
617ba13b 4610 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 4611
0390131b
FM		 4612 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
4613 BUG_ON(journal != NULL);
4614 return;
4615 }
dab291af 4616 jbd2_journal_lock_updates(journal);
7ffe1ea8
HK		 4617 if (jbd2_journal_flush(journal) < 0)
4618 goto out;
4619
617ba13b 4620 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
ac27a0ec 4621 sb->s_flags & MS_RDONLY) {
617ba13b 4622 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
e2d67052 4623 ext4_commit_super(sb, 1);
ac27a0ec 4624 }
7ffe1ea8
HK		 4625
4626out:
dab291af 4627 jbd2_journal_unlock_updates(journal);
ac27a0ec
DK		 4628}
4629
4630/*
4631 * If we are mounting (or read-write remounting) a filesystem whose journal
4632 * has recorded an error from a previous lifetime, move that error to the
4633 * main filesystem now.
4634 */
2b2d6d01
TT		 4635static void ext4_clear_journal_err(struct super_block *sb,
4636 struct ext4_super_block *es)
ac27a0ec
DK		 4637{
4638 journal_t *journal;
4639 int j_errno;
4640 const char *errstr;
4641
0390131b
FM		 4642 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4643
617ba13b 4644 journal = EXT4_SB(sb)->s_journal;
ac27a0ec
DK		 4645
4646 /*
4647 * Now check for any error status which may have been recorded in the
617ba13b 4648 * journal by a prior ext4_error() or ext4_abort()
ac27a0ec
DK		 4649 */
4650
dab291af 4651 j_errno = jbd2_journal_errno(journal);
ac27a0ec
DK		 4652 if (j_errno) {
4653 char nbuf[16];
4654
617ba13b 4655 errstr = ext4_decode_error(sb, j_errno, nbuf);
12062ddd 4656 ext4_warning(sb, "Filesystem error recorded "
ac27a0ec 4657 "from previous mount: %s", errstr);
12062ddd 4658 ext4_warning(sb, "Marking fs in need of filesystem check.");
ac27a0ec 4659
617ba13b
MC		 4660 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
4661 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
e2d67052 4662 ext4_commit_super(sb, 1);
ac27a0ec 4663
dab291af 4664 jbd2_journal_clear_err(journal);
d796c52e 4665 jbd2_journal_update_sb_errno(journal);
ac27a0ec
DK		 4666 }
4667}
4668
4669/*
4670 * Force the running and committing transactions to commit,
4671 * and wait on the commit.
4672 */
617ba13b 4673int ext4_force_commit(struct super_block *sb)
ac27a0ec
DK		 4674{
4675 journal_t *journal;
ac27a0ec
DK		 4676
4677 if (sb->s_flags & MS_RDONLY)
4678 return 0;
4679
617ba13b 4680 journal = EXT4_SB(sb)->s_journal;
b1deefc9 4681 return ext4_journal_force_commit(journal);
ac27a0ec
DK		 4682}
4683
617ba13b 4684static int ext4_sync_fs(struct super_block *sb, int wait)
ac27a0ec 4685{
14ce0cb4 4686 int ret = 0;
9eddacf9 4687 tid_t target;
06a407f1 4688 bool needs_barrier = false;
8d5d02e6 4689 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4690
9bffad1e 4691 trace_ext4_sync_fs(sb, wait);
2e8fa54e 4692 flush_workqueue(sbi->rsv_conversion_wq);
a1177825
JK		 4693 /*
4694 * Writeback quota in non-journalled quota case - journalled quota has
4695 * no dirty dquots
4696 */
4697 dquot_writeback_dquots(sb, -1);
06a407f1
DM		 4698 /*
4699 * Data writeback is possible w/o journal transaction, so barrier must
4700 * being sent at the end of the function. But we can skip it if
4701 * transaction_commit will do it for us.
4702 */
bda32530
TT		 4703 if (sbi->s_journal) {
4704 target = jbd2_get_latest_transaction(sbi->s_journal);
4705 if (wait && sbi->s_journal->j_flags & JBD2_BARRIER &&
4706 !jbd2_trans_will_send_data_barrier(sbi->s_journal, target))
4707 needs_barrier = true;
4708
4709 if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
4710 if (wait)
4711 ret = jbd2_log_wait_commit(sbi->s_journal,
4712 target);
4713 }
4714 } else if (wait && test_opt(sb, BARRIER))
06a407f1 4715 needs_barrier = true;
06a407f1
DM		 4716 if (needs_barrier) {
4717 int err;
4718 err = blkdev_issue_flush(sb->s_bdev, GFP_KERNEL, NULL);
4719 if (!ret)
4720 ret = err;
0390131b 4721 }
06a407f1
DM		 4722
4723 return ret;
4724}
4725
ac27a0ec
DK		 4726/*
4727 * LVM calls this function before a (read-only) snapshot is created. This
4728 * gives us a chance to flush the journal completely and mark the fs clean.
be4f27d3
YY		 4729 *
4730 * Note that only this function cannot bring a filesystem to be in a clean
8e8ad8a5
JK		 4731 * state independently. It relies on upper layer to stop all data & metadata
4732 * modifications.
ac27a0ec 4733 */
c4be0c1d 4734static int ext4_freeze(struct super_block *sb)
ac27a0ec 4735{
c4be0c1d
TS		 4736 int error = 0;
4737 journal_t *journal;
ac27a0ec 4738
9ca92389
TT		 4739 if (sb->s_flags & MS_RDONLY)
4740 return 0;
ac27a0ec 4741
9ca92389 4742 journal = EXT4_SB(sb)->s_journal;
7ffe1ea8 4743
bb044576
TT		 4744 if (journal) {
4745 /* Now we set up the journal barrier. */
4746 jbd2_journal_lock_updates(journal);
ac27a0ec 4747
bb044576
TT		 4748 /*
4749 * Don't clear the needs_recovery flag if we failed to
4750 * flush the journal.
4751 */
4752 error = jbd2_journal_flush(journal);
4753 if (error < 0)
4754 goto out;
4755 }
9ca92389
TT		 4756
4757 /* Journal blocked and flushed, clear needs_recovery flag. */
4758 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4759 error = ext4_commit_super(sb, 1);
6b0310fb 4760out:
bb044576
TT		 4761 if (journal)
4762 /* we rely on upper layer to stop further updates */
4763 jbd2_journal_unlock_updates(journal);
6b0310fb 4764 return error;
ac27a0ec
DK		 4765}
4766
4767/*
4768 * Called by LVM after the snapshot is done. We need to reset the RECOVER
4769 * flag here, even though the filesystem is not technically dirty yet.
4770 */
c4be0c1d 4771static int ext4_unfreeze(struct super_block *sb)
ac27a0ec 4772{
9ca92389
TT		 4773 if (sb->s_flags & MS_RDONLY)
4774 return 0;
4775
9ca92389
TT		 4776 /* Reset the needs_recovery flag before the fs is unlocked. */
4777 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4778 ext4_commit_super(sb, 1);
c4be0c1d 4779 return 0;
ac27a0ec
DK		 4780}
4781
673c6100
TT		 4782/*
4783 * Structure to save mount options for ext4_remount's benefit
4784 */
4785struct ext4_mount_options {
4786 unsigned long s_mount_opt;
a2595b8a 4787 unsigned long s_mount_opt2;
08cefc7a
EB		 4788 kuid_t s_resuid;
4789 kgid_t s_resgid;
673c6100
TT		 4790 unsigned long s_commit_interval;
4791 u32 s_min_batch_time, s_max_batch_time;
4792#ifdef CONFIG_QUOTA
4793 int s_jquota_fmt;
a2d4a646 4794 char *s_qf_names[EXT4_MAXQUOTAS];
673c6100
TT		 4795#endif
4796};
4797
2b2d6d01 4798static int ext4_remount(struct super_block *sb, int *flags, char *data)
ac27a0ec 4799{
2b2d6d01 4800 struct ext4_super_block *es;
617ba13b 4801 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4802 unsigned long old_sb_flags;
617ba13b 4803 struct ext4_mount_options old_opts;
c79d967d 4804 int enable_quota = 0;
8a266467 4805 ext4_group_t g;
b3881f74 4806 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
c5e06d10 4807 int err = 0;
ac27a0ec 4808#ifdef CONFIG_QUOTA
03dafb5f 4809 int i, j;
ac27a0ec 4810#endif
d4c402d9 4811 char *orig_data = kstrdup(data, GFP_KERNEL);
ac27a0ec
DK		 4812
4813 /* Store the original options */
4814 old_sb_flags = sb->s_flags;
4815 old_opts.s_mount_opt = sbi->s_mount_opt;
a2595b8a 4816 old_opts.s_mount_opt2 = sbi->s_mount_opt2;
ac27a0ec
DK		 4817 old_opts.s_resuid = sbi->s_resuid;
4818 old_opts.s_resgid = sbi->s_resgid;
4819 old_opts.s_commit_interval = sbi->s_commit_interval;
30773840
TT		 4820 old_opts.s_min_batch_time = sbi->s_min_batch_time;
4821 old_opts.s_max_batch_time = sbi->s_max_batch_time;
ac27a0ec
DK		 4822#ifdef CONFIG_QUOTA
4823 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
a2d4a646 4824 for (i = 0; i < EXT4_MAXQUOTAS; i++)
03dafb5f
CG		 4825 if (sbi->s_qf_names[i]) {
4826 old_opts.s_qf_names[i] = kstrdup(sbi->s_qf_names[i],
4827 GFP_KERNEL);
4828 if (!old_opts.s_qf_names[i]) {
4829 for (j = 0; j < i; j++)
4830 kfree(old_opts.s_qf_names[j]);
3e36a163 4831 kfree(orig_data);
03dafb5f
CG		 4832 return -ENOMEM;
4833 }
4834 } else
4835 old_opts.s_qf_names[i] = NULL;
ac27a0ec 4836#endif
b3881f74
TT		 4837 if (sbi->s_journal && sbi->s_journal->j_task->io_context)
4838 journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
ac27a0ec
DK		 4839
4840 /*
4841 * Allow the "check" option to be passed as a remount option.
4842 */
661aa520 4843 if (!parse_options(data, sb, NULL, &journal_ioprio, 1)) {
ac27a0ec
DK		 4844 err = -EINVAL;
4845 goto restore_opts;
4846 }
4847
6b992ff2 4848 if ((old_opts.s_mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) ^
c6d3d56d
DW		 4849 test_opt(sb, JOURNAL_CHECKSUM)) {
4850 ext4_msg(sb, KERN_ERR, "changing journal_checksum "
4851 "during remount not supported");
4852 err = -EINVAL;
4853 goto restore_opts;
4854 }
4855
4856 if ((old_opts.s_mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) ^
6b992ff2
DW		 4857 test_opt(sb, JOURNAL_CHECKSUM)) {
4858 ext4_msg(sb, KERN_ERR, "changing journal_checksum "
4859 "during remount not supported");
4860 err = -EINVAL;
4861 goto restore_opts;
4862 }
4863
6ae6514b
PS		 4864 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
4865 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
4866 ext4_msg(sb, KERN_ERR, "can't mount with "
4867 "both data=journal and delalloc");
4868 err = -EINVAL;
4869 goto restore_opts;
4870 }
4871 if (test_opt(sb, DIOREAD_NOLOCK)) {
4872 ext4_msg(sb, KERN_ERR, "can't mount with "
4873 "both data=journal and dioread_nolock");
4874 err = -EINVAL;
4875 goto restore_opts;
4876 }
4877 }
4878
4ab2f15b 4879 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
c67d859e 4880 ext4_abort(sb, "Abort forced by user");
ac27a0ec
DK		 4881
4882 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
482a7425 4883 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec
DK		 4884
4885 es = sbi->s_es;
4886
b3881f74 4887 if (sbi->s_journal) {
0390131b 4888 ext4_init_journal_params(sb, sbi->s_journal);
b3881f74
TT		 4889 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
4890 }
ac27a0ec 4891
661aa520 4892 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
4ab2f15b 4893 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) {
ac27a0ec
DK		 4894 err = -EROFS;
4895 goto restore_opts;
4896 }
4897
4898 if (*flags & MS_RDONLY) {
38c03b34
TT		 4899 err = sync_filesystem(sb);
4900 if (err < 0)
4901 goto restore_opts;
0f0dd62f
CH		 4902 err = dquot_suspend(sb, -1);
4903 if (err < 0)
c79d967d 4904 goto restore_opts;
c79d967d 4905
ac27a0ec
DK		 4906 /*
4907 * First of all, the unconditional stuff we have to do
4908 * to disable replay of the journal when we next remount
4909 */
4910 sb->s_flags |= MS_RDONLY;
4911
4912 /*
4913 * OK, test if we are remounting a valid rw partition
4914 * readonly, and if so set the rdonly flag and then
4915 * mark the partition as valid again.
4916 */
617ba13b
MC		 4917 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
4918 (sbi->s_mount_state & EXT4_VALID_FS))
ac27a0ec
DK		 4919 es->s_state = cpu_to_le16(sbi->s_mount_state);
4920
a63c9eb2 4921 if (sbi->s_journal)
0390131b 4922 ext4_mark_recovery_complete(sb, es);
ac27a0ec 4923 } else {
a13fb1a4
ES		 4924 /* Make sure we can mount this feature set readwrite */
4925 if (!ext4_feature_set_ok(sb, 0)) {
ac27a0ec
DK		 4926 err = -EROFS;
4927 goto restore_opts;
4928 }
8a266467
TT		 4929 /*
4930 * Make sure the group descriptor checksums
0b8e58a1 4931 * are sane. If they aren't, refuse to remount r/w.
8a266467
TT		 4932 */
4933 for (g = 0; g < sbi->s_groups_count; g++) {
4934 struct ext4_group_desc *gdp =
4935 ext4_get_group_desc(sb, g, NULL);
4936
feb0ab32 4937 if (!ext4_group_desc_csum_verify(sb, g, gdp)) {
b31e1552
ES		 4938 ext4_msg(sb, KERN_ERR,
4939 "ext4_remount: Checksum for group %u failed (%u!=%u)",
8a266467
TT		 4940 g, le16_to_cpu(ext4_group_desc_csum(sbi, g, gdp)),
4941 le16_to_cpu(gdp->bg_checksum));
4942 err = -EINVAL;
4943 goto restore_opts;
4944 }
4945 }
4946
ead6596b
ES		 4947 /*
4948 * If we have an unprocessed orphan list hanging
4949 * around from a previously readonly bdev mount,
4950 * require a full umount/remount for now.
4951 */
4952 if (es->s_last_orphan) {
b31e1552 4953 ext4_msg(sb, KERN_WARNING, "Couldn't "
ead6596b
ES		 4954 "remount RDWR because of unprocessed "
4955 "orphan inode list. Please "
b31e1552 4956 "umount/remount instead");
ead6596b
ES		 4957 err = -EINVAL;
4958 goto restore_opts;
4959 }
4960
ac27a0ec
DK		 4961 /*
4962 * Mounting a RDONLY partition read-write, so reread
4963 * and store the current valid flag. (It may have
4964 * been changed by e2fsck since we originally mounted
4965 * the partition.)
4966 */
0390131b
FM		 4967 if (sbi->s_journal)
4968 ext4_clear_journal_err(sb, es);
ac27a0ec 4969 sbi->s_mount_state = le16_to_cpu(es->s_state);
2b2d6d01 4970 if (!ext4_setup_super(sb, es, 0))
ac27a0ec 4971 sb->s_flags &= ~MS_RDONLY;
c5e06d10
JL		 4972 if (EXT4_HAS_INCOMPAT_FEATURE(sb,
4973 EXT4_FEATURE_INCOMPAT_MMP))
4974 if (ext4_multi_mount_protect(sb,
4975 le64_to_cpu(es->s_mmp_block))) {
4976 err = -EROFS;
4977 goto restore_opts;
4978 }
c79d967d 4979 enable_quota = 1;
ac27a0ec
DK		 4980 }
4981 }
bfff6873
LC		 4982
4983 /*
4984 * Reinitialize lazy itable initialization thread based on
4985 * current settings
4986 */
4987 if ((sb->s_flags & MS_RDONLY) || !test_opt(sb, INIT_INODE_TABLE))
4988 ext4_unregister_li_request(sb);
4989 else {
4990 ext4_group_t first_not_zeroed;
4991 first_not_zeroed = ext4_has_uninit_itable(sb);
4992 ext4_register_li_request(sb, first_not_zeroed);
4993 }
4994
6fd058f7 4995 ext4_setup_system_zone(sb);
d096ad0f 4996 if (sbi->s_journal == NULL && !(old_sb_flags & MS_RDONLY))
e2d67052 4997 ext4_commit_super(sb, 1);
0390131b 4998
ac27a0ec
DK		 4999#ifdef CONFIG_QUOTA
5000 /* Release old quota file names */
a2d4a646 5001 for (i = 0; i < EXT4_MAXQUOTAS; i++)
03dafb5f 5002 kfree(old_opts.s_qf_names[i]);
7c319d32
AK		 5003 if (enable_quota) {
5004 if (sb_any_quota_suspended(sb))
5005 dquot_resume(sb, -1);
5006 else if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
5007 EXT4_FEATURE_RO_COMPAT_QUOTA)) {
5008 err = ext4_enable_quotas(sb);
07724f98 5009 if (err)
7c319d32 5010 goto restore_opts;
7c319d32
AK		 5011 }
5012 }
ac27a0ec 5013#endif
d4c402d9
CW		 5014
5015 ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s", orig_data);
5016 kfree(orig_data);
ac27a0ec 5017 return 0;
0b8e58a1 5018
ac27a0ec
DK		 5019restore_opts:
5020 sb->s_flags = old_sb_flags;
5021 sbi->s_mount_opt = old_opts.s_mount_opt;
a2595b8a 5022 sbi->s_mount_opt2 = old_opts.s_mount_opt2;
ac27a0ec
DK		 5023 sbi->s_resuid = old_opts.s_resuid;
5024 sbi->s_resgid = old_opts.s_resgid;
5025 sbi->s_commit_interval = old_opts.s_commit_interval;
30773840
TT		 5026 sbi->s_min_batch_time = old_opts.s_min_batch_time;
5027 sbi->s_max_batch_time = old_opts.s_max_batch_time;
ac27a0ec
DK		 5028#ifdef CONFIG_QUOTA
5029 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
a2d4a646 5030 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
03dafb5f 5031 kfree(sbi->s_qf_names[i]);
ac27a0ec
DK		 5032 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
5033 }
5034#endif
d4c402d9 5035 kfree(orig_data);
ac27a0ec
DK		 5036 return err;
5037}
5038
2b2d6d01 5039static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
ac27a0ec
DK		 5040{
5041 struct super_block *sb = dentry->d_sb;
617ba13b
MC		 5042 struct ext4_sb_info *sbi = EXT4_SB(sb);
5043 struct ext4_super_block *es = sbi->s_es;
27dd4385 5044 ext4_fsblk_t overhead = 0, resv_blocks;
960cc398 5045 u64 fsid;
d02a9391 5046 s64 bfree;
27dd4385 5047 resv_blocks = EXT4_C2B(sbi, atomic64_read(&sbi->s_resv_clusters));
ac27a0ec 5048
952fc18e
TT		 5049 if (!test_opt(sb, MINIX_DF))
5050 overhead = sbi->s_overhead;
ac27a0ec 5051
617ba13b 5052 buf->f_type = EXT4_SUPER_MAGIC;
ac27a0ec 5053 buf->f_bsize = sb->s_blocksize;
b72f78cb 5054 buf->f_blocks = ext4_blocks_count(es) - EXT4_C2B(sbi, overhead);
57042651
TT		 5055 bfree = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) -
5056 percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter);
d02a9391 5057 /* prevent underflow in case that few free space is available */
57042651 5058 buf->f_bfree = EXT4_C2B(sbi, max_t(s64, bfree, 0));
27dd4385
LC		 5059 buf->f_bavail = buf->f_bfree -
5060 (ext4_r_blocks_count(es) + resv_blocks);
5061 if (buf->f_bfree < (ext4_r_blocks_count(es) + resv_blocks))
ac27a0ec
DK		 5062 buf->f_bavail = 0;
5063 buf->f_files = le32_to_cpu(es->s_inodes_count);
52d9f3b4 5064 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
617ba13b 5065 buf->f_namelen = EXT4_NAME_LEN;
960cc398
PE		 5066 fsid = le64_to_cpup((void *)es->s_uuid) ^
5067 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
5068 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
5069 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
0b8e58a1 5070
ac27a0ec
DK		 5071 return 0;
5072}
5073
0b8e58a1
AD		 5074/* Helper function for writing quotas on sync - we need to start transaction
5075 * before quota file is locked for write. Otherwise the are possible deadlocks:
ac27a0ec 5076 * Process 1 Process 2
617ba13b 5077 * ext4_create() quota_sync()
a269eb18 5078 * jbd2_journal_start() write_dquot()
871a2931 5079 * dquot_initialize() down(dqio_mutex)
dab291af 5080 * down(dqio_mutex) jbd2_journal_start()
ac27a0ec
DK		 5081 *
5082 */
5083
5084#ifdef CONFIG_QUOTA
5085
5086static inline struct inode *dquot_to_inode(struct dquot *dquot)
5087{
4c376dca 5088 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_id.type];
ac27a0ec
DK		 5089}
5090
617ba13b 5091static int ext4_write_dquot(struct dquot *dquot)
ac27a0ec
DK		 5092{
5093 int ret, err;
5094 handle_t *handle;
5095 struct inode *inode;
5096
5097 inode = dquot_to_inode(dquot);
9924a92a 5098 handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
0b8e58a1 5099 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 5100 if (IS_ERR(handle))
5101 return PTR_ERR(handle);
5102 ret = dquot_commit(dquot);
617ba13b 5103 err = ext4_journal_stop(handle);
ac27a0ec
DK		 5104 if (!ret)
5105 ret = err;
5106 return ret;
5107}
5108
617ba13b 5109static int ext4_acquire_dquot(struct dquot *dquot)
ac27a0ec
DK		 5110{
5111 int ret, err;
5112 handle_t *handle;
5113
9924a92a 5114 handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
0b8e58a1 5115 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 5116 if (IS_ERR(handle))
5117 return PTR_ERR(handle);
5118 ret = dquot_acquire(dquot);
617ba13b 5119 err = ext4_journal_stop(handle);
ac27a0ec
DK		 5120 if (!ret)
5121 ret = err;
5122 return ret;
5123}
5124
617ba13b 5125static int ext4_release_dquot(struct dquot *dquot)
ac27a0ec
DK		 5126{
5127 int ret, err;
5128 handle_t *handle;
5129
9924a92a 5130 handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
0b8e58a1 5131 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
9c3013e9
JK		 5132 if (IS_ERR(handle)) {
5133 /* Release dquot anyway to avoid endless cycle in dqput() */
5134 dquot_release(dquot);
ac27a0ec 5135 return PTR_ERR(handle);
9c3013e9 5136 }
ac27a0ec 5137 ret = dquot_release(dquot);
617ba13b 5138 err = ext4_journal_stop(handle);
ac27a0ec
DK		 5139 if (!ret)
5140 ret = err;
5141 return ret;
5142}
5143
617ba13b 5144static int ext4_mark_dquot_dirty(struct dquot *dquot)
ac27a0ec 5145{
262b4662
JK		 5146 struct super_block *sb = dquot->dq_sb;
5147 struct ext4_sb_info *sbi = EXT4_SB(sb);
5148
2c8be6b2 5149 /* Are we journaling quotas? */
262b4662
JK		 5150 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) ||
5151 sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
ac27a0ec 5152 dquot_mark_dquot_dirty(dquot);
617ba13b 5153 return ext4_write_dquot(dquot);
ac27a0ec
DK		 5154 } else {
5155 return dquot_mark_dquot_dirty(dquot);
5156 }
5157}
5158
617ba13b 5159static int ext4_write_info(struct super_block *sb, int type)
ac27a0ec
DK		 5160{
5161 int ret, err;
5162 handle_t *handle;
5163
5164 /* Data block + inode block */
9924a92a 5165 handle = ext4_journal_start(sb->s_root->d_inode, EXT4_HT_QUOTA, 2);
ac27a0ec
DK		 5166 if (IS_ERR(handle))
5167 return PTR_ERR(handle);
5168 ret = dquot_commit_info(sb, type);
617ba13b 5169 err = ext4_journal_stop(handle);
ac27a0ec
DK		 5170 if (!ret)
5171 ret = err;
5172 return ret;
5173}
5174
5175/*
5176 * Turn on quotas during mount time - we need to find
5177 * the quota file and such...
5178 */
617ba13b 5179static int ext4_quota_on_mount(struct super_block *sb, int type)
ac27a0ec 5180{
287a8095
CH		 5181 return dquot_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
5182 EXT4_SB(sb)->s_jquota_fmt, type);
ac27a0ec
DK		 5183}
5184
5185/*
5186 * Standard function to be called on quota_on
5187 */
617ba13b 5188static int ext4_quota_on(struct super_block *sb, int type, int format_id,
f00c9e44 5189 struct path *path)
ac27a0ec
DK		 5190{
5191 int err;
ac27a0ec
DK		 5192
5193 if (!test_opt(sb, QUOTA))
5194 return -EINVAL;
0623543b 5195
ac27a0ec 5196 /* Quotafile not on the same filesystem? */
d8c9584e 5197 if (path->dentry->d_sb != sb)
ac27a0ec 5198 return -EXDEV;
0623543b
JK		 5199 /* Journaling quota? */
5200 if (EXT4_SB(sb)->s_qf_names[type]) {
2b2d6d01 5201 /* Quotafile not in fs root? */
f00c9e44 5202 if (path->dentry->d_parent != sb->s_root)
b31e1552
ES		 5203 ext4_msg(sb, KERN_WARNING,
5204 "Quota file not on filesystem root. "
5205 "Journaled quota will not work");
2b2d6d01 5206 }
0623543b
JK		 5207
5208 /*
5209 * When we journal data on quota file, we have to flush journal to see
5210 * all updates to the file when we bypass pagecache...
5211 */
0390131b 5212 if (EXT4_SB(sb)->s_journal &&
f00c9e44 5213 ext4_should_journal_data(path->dentry->d_inode)) {
0623543b
JK		 5214 /*
5215 * We don't need to lock updates but journal_flush() could
5216 * otherwise be livelocked...
5217 */
5218 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
7ffe1ea8 5219 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
0623543b 5220 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
f00c9e44 5221 if (err)
7ffe1ea8 5222 return err;
0623543b
JK		 5223 }
5224
f00c9e44 5225 return dquot_quota_on(sb, type, format_id, path);
ac27a0ec
DK		 5226}
5227
7c319d32
AK		 5228static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
5229 unsigned int flags)
5230{
5231 int err;
5232 struct inode *qf_inode;
a2d4a646 5233 unsigned long qf_inums[EXT4_MAXQUOTAS] = {
7c319d32
AK		 5234 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
5235 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum)
5236 };
5237
5238 BUG_ON(!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA));
5239
5240 if (!qf_inums[type])
5241 return -EPERM;
5242
5243 qf_inode = ext4_iget(sb, qf_inums[type]);
5244 if (IS_ERR(qf_inode)) {
5245 ext4_error(sb, "Bad quota inode # %lu", qf_inums[type]);
5246 return PTR_ERR(qf_inode);
5247 }
5248
bcb13850
JK		 5249 /* Don't account quota for quota files to avoid recursion */
5250 qf_inode->i_flags |= S_NOQUOTA;
7c319d32
AK		 5251 err = dquot_enable(qf_inode, type, format_id, flags);
5252 iput(qf_inode);
5253
5254 return err;
5255}
5256
5257/* Enable usage tracking for all quota types. */
5258static int ext4_enable_quotas(struct super_block *sb)
5259{
5260 int type, err = 0;
a2d4a646 5261 unsigned long qf_inums[EXT4_MAXQUOTAS] = {
7c319d32
AK		 5262 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
5263 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum)
5264 };
5265
5266 sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE;
a2d4a646 5267 for (type = 0; type < EXT4_MAXQUOTAS; type++) {
7c319d32
AK		 5268 if (qf_inums[type]) {
5269 err = ext4_quota_enable(sb, type, QFMT_VFS_V1,
5270 DQUOT_USAGE_ENABLED);
5271 if (err) {
5272 ext4_warning(sb,
72ba7450
TT		 5273 "Failed to enable quota tracking "
5274 "(type=%d, err=%d). Please run "
5275 "e2fsck to fix.", type, err);
7c319d32
AK		 5276 return err;
5277 }
5278 }
5279 }
5280 return 0;
5281}
5282
5283/*
5284 * quota_on function that is used when QUOTA feature is set.
5285 */
5286static int ext4_quota_on_sysfile(struct super_block *sb, int type,
5287 int format_id)
5288{
5289 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA))
5290 return -EINVAL;
5291
5292 /*
5293 * USAGE was enabled at mount time. Only need to enable LIMITS now.
5294 */
5295 return ext4_quota_enable(sb, type, format_id, DQUOT_LIMITS_ENABLED);
5296}
5297
ca0e05e4
DM		 5298static int ext4_quota_off(struct super_block *sb, int type)
5299{
21f97697
JK		 5300 struct inode *inode = sb_dqopt(sb)->files[type];
5301 handle_t *handle;
5302
87009d86
DM		 5303 /* Force all delayed allocation blocks to be allocated.
5304 * Caller already holds s_umount sem */
5305 if (test_opt(sb, DELALLOC))
ca0e05e4 5306 sync_filesystem(sb);
ca0e05e4 5307
0b268590
AG		 5308 if (!inode)
5309 goto out;
5310
21f97697
JK		 5311 /* Update modification times of quota files when userspace can
5312 * start looking at them */
9924a92a 5313 handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1);
21f97697
JK		 5314 if (IS_ERR(handle))
5315 goto out;
5316 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
5317 ext4_mark_inode_dirty(handle, inode);
5318 ext4_journal_stop(handle);
5319
5320out:
ca0e05e4
DM		 5321 return dquot_quota_off(sb, type);
5322}
5323
7c319d32
AK		 5324/*
5325 * quota_off function that is used when QUOTA feature is set.
5326 */
5327static int ext4_quota_off_sysfile(struct super_block *sb, int type)
5328{
5329 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA))
5330 return -EINVAL;
5331
5332 /* Disable only the limits. */
5333 return dquot_disable(sb, type, DQUOT_LIMITS_ENABLED);
5334}
5335
ac27a0ec
DK		 5336/* Read data from quotafile - avoid pagecache and such because we cannot afford
5337 * acquiring the locks... As quota files are never truncated and quota code
25985edc 5338 * itself serializes the operations (and no one else should touch the files)
ac27a0ec 5339 * we don't have to be afraid of races */
617ba13b 5340static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec
DK		 5341 size_t len, loff_t off)
5342{
5343 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 5344 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 5345 int offset = off & (sb->s_blocksize - 1);
5346 int tocopy;
5347 size_t toread;
5348 struct buffer_head *bh;
5349 loff_t i_size = i_size_read(inode);
5350
5351 if (off > i_size)
5352 return 0;
5353 if (off+len > i_size)
5354 len = i_size-off;
5355 toread = len;
5356 while (toread > 0) {
5357 tocopy = sb->s_blocksize - offset < toread ?
5358 sb->s_blocksize - offset : toread;
1c215028
TT		 5359 bh = ext4_bread(NULL, inode, blk, 0);
5360 if (IS_ERR(bh))
5361 return PTR_ERR(bh);
ac27a0ec
DK		 5362 if (!bh) /* A hole? */
5363 memset(data, 0, tocopy);
5364 else
5365 memcpy(data, bh->b_data+offset, tocopy);
5366 brelse(bh);
5367 offset = 0;
5368 toread -= tocopy;
5369 data += tocopy;
5370 blk++;
5371 }
5372 return len;
5373}
5374
5375/* Write to quotafile (we know the transaction is already started and has
5376 * enough credits) */
617ba13b 5377static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec
DK		 5378 const char *data, size_t len, loff_t off)
5379{
5380 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 5381 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
1c215028 5382 int err, offset = off & (sb->s_blocksize - 1);
ac27a0ec
DK		 5383 struct buffer_head *bh;
5384 handle_t *handle = journal_current_handle();
5385
0390131b 5386 if (EXT4_SB(sb)->s_journal && !handle) {
b31e1552
ES		 5387 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
5388 " cancelled because transaction is not started",
9c3013e9
JK		 5389 (unsigned long long)off, (unsigned long long)len);
5390 return -EIO;
5391 }
67eeb568
DM		 5392 /*
5393 * Since we account only one data block in transaction credits,
5394 * then it is impossible to cross a block boundary.
5395 */
5396 if (sb->s_blocksize - offset < len) {
5397 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
5398 " cancelled because not block aligned",
5399 (unsigned long long)off, (unsigned long long)len);
5400 return -EIO;
5401 }
5402
1c215028
TT		 5403 bh = ext4_bread(handle, inode, blk, 1);
5404 if (IS_ERR(bh))
5405 return PTR_ERR(bh);
67eeb568
DM		 5406 if (!bh)
5407 goto out;
5d601255 5408 BUFFER_TRACE(bh, "get write access");
62d2b5f2
JK		 5409 err = ext4_journal_get_write_access(handle, bh);
5410 if (err) {
5411 brelse(bh);
1c215028 5412 return err;
ac27a0ec 5413 }
67eeb568
DM		 5414 lock_buffer(bh);
5415 memcpy(bh->b_data+offset, data, len);
5416 flush_dcache_page(bh->b_page);
5417 unlock_buffer(bh);
62d2b5f2 5418 err = ext4_handle_dirty_metadata(handle, NULL, bh);
67eeb568 5419 brelse(bh);
ac27a0ec 5420out:
67eeb568
DM		 5421 if (inode->i_size < off + len) {
5422 i_size_write(inode, off + len);
617ba13b 5423 EXT4_I(inode)->i_disksize = inode->i_size;
21f97697 5424 ext4_mark_inode_dirty(handle, inode);
ac27a0ec 5425 }
67eeb568 5426 return len;
ac27a0ec
DK		 5427}
5428
5429#endif
5430
152a0836
AV		 5431static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
5432 const char *dev_name, void *data)
ac27a0ec 5433{
152a0836 5434 return mount_bdev(fs_type, flags, dev_name, data, ext4_fill_super);
ac27a0ec
DK		 5435}
5436
37f328eb 5437#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
24b58424
TT		 5438static inline void register_as_ext2(void)
5439{
5440 int err = register_filesystem(&ext2_fs_type);
5441 if (err)
5442 printk(KERN_WARNING
5443 "EXT4-fs: Unable to register as ext2 (%d)\n", err);
5444}
5445
5446static inline void unregister_as_ext2(void)
5447{
5448 unregister_filesystem(&ext2_fs_type);
5449}
2035e776
TT		 5450
5451static inline int ext2_feature_set_ok(struct super_block *sb)
5452{
5453 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP))
5454 return 0;
5455 if (sb->s_flags & MS_RDONLY)
5456 return 1;
5457 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))
5458 return 0;
5459 return 1;
5460}
24b58424
TT		 5461#else
5462static inline void register_as_ext2(void) { }
5463static inline void unregister_as_ext2(void) { }
2035e776 5464static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; }
24b58424
TT		 5465#endif
5466
37f328eb 5467#if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
24b58424
TT		 5468static inline void register_as_ext3(void)
5469{
5470 int err = register_filesystem(&ext3_fs_type);
5471 if (err)
5472 printk(KERN_WARNING
5473 "EXT4-fs: Unable to register as ext3 (%d)\n", err);
5474}
5475
5476static inline void unregister_as_ext3(void)
5477{
5478 unregister_filesystem(&ext3_fs_type);
5479}
2035e776
TT		 5480
5481static inline int ext3_feature_set_ok(struct super_block *sb)
5482{
5483 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP))
5484 return 0;
5485 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
5486 return 0;
5487 if (sb->s_flags & MS_RDONLY)
5488 return 1;
5489 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP))
5490 return 0;
5491 return 1;
5492}
24b58424
TT		 5493#else
5494static inline void register_as_ext3(void) { }
5495static inline void unregister_as_ext3(void) { }
2035e776 5496static inline int ext3_feature_set_ok(struct super_block *sb) { return 0; }
24b58424
TT		 5497#endif
5498
03010a33
TT		 5499static struct file_system_type ext4_fs_type = {
5500 .owner = THIS_MODULE,
5501 .name = "ext4",
152a0836 5502 .mount = ext4_mount,
03010a33
TT		 5503 .kill_sb = kill_block_super,
5504 .fs_flags = FS_REQUIRES_DEV,
5505};
7f78e035 5506MODULE_ALIAS_FS("ext4");
03010a33 5507
8f021222 5508static int __init ext4_init_feat_adverts(void)
857ac889
LC		 5509{
5510 struct ext4_features *ef;
5511 int ret = -ENOMEM;
5512
5513 ef = kzalloc(sizeof(struct ext4_features), GFP_KERNEL);
5514 if (!ef)
5515 goto out;
5516
5517 ef->f_kobj.kset = ext4_kset;
5518 init_completion(&ef->f_kobj_unregister);
5519 ret = kobject_init_and_add(&ef->f_kobj, &ext4_feat_ktype, NULL,
5520 "features");
5521 if (ret) {
5522 kfree(ef);
5523 goto out;
5524 }
5525
5526 ext4_feat = ef;
5527 ret = 0;
5528out:
5529 return ret;
5530}
5531
8f021222
LC		 5532static void ext4_exit_feat_adverts(void)
5533{
5534 kobject_put(&ext4_feat->f_kobj);
5535 wait_for_completion(&ext4_feat->f_kobj_unregister);
5536 kfree(ext4_feat);
5537}
5538
e9e3bcec
ES		 5539/* Shared across all ext4 file systems */
5540wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
5541struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ];
5542
5dabfc78 5543static int __init ext4_init_fs(void)
ac27a0ec 5544{
e9e3bcec 5545 int i, err;
c9de560d 5546
07c0c5d8
AV		 5547 ext4_li_info = NULL;
5548 mutex_init(&ext4_li_mtx);
5549
9a4c8019 5550 /* Build-time check for flags consistency */
12e9b892 5551 ext4_check_flag_values();
e9e3bcec
ES		 5552
5553 for (i = 0; i < EXT4_WQ_HASH_SZ; i++) {
5554 mutex_init(&ext4__aio_mutex[i]);
5555 init_waitqueue_head(&ext4__ioend_wq[i]);
5556 }
5557
51865fda 5558 err = ext4_init_es();
6fd058f7
TT		 5559 if (err)
5560 return err;
51865fda
ZL		 5561
5562 err = ext4_init_pageio();
5563 if (err)
5564 goto out7;
5565
5dabfc78 5566 err = ext4_init_system_zone();
bd2d0210 5567 if (err)
d44651d0 5568 goto out6;
3197ebdb 5569 ext4_kset = kset_create_and_add("ext4", NULL, fs_kobj);
0e376b1e
TT		 5570 if (!ext4_kset) {
5571 err = -ENOMEM;
dd68314c 5572 goto out5;
0e376b1e 5573 }
d44651d0 5574 ext4_proc_root = proc_mkdir("fs/ext4", NULL);
857ac889
LC		 5575
5576 err = ext4_init_feat_adverts();
dd68314c
TT		 5577 if (err)
5578 goto out4;
857ac889 5579
5dabfc78 5580 err = ext4_init_mballoc();
c9de560d
AT		 5581 if (err)
5582 goto out2;
9c191f70
M		 5583 else
5584 ext4_mballoc_ready = 1;
ac27a0ec
DK		 5585 err = init_inodecache();
5586 if (err)
5587 goto out1;
24b58424 5588 register_as_ext3();
2035e776 5589 register_as_ext2();
03010a33 5590 err = register_filesystem(&ext4_fs_type);
ac27a0ec
DK		 5591 if (err)
5592 goto out;
bfff6873 5593
ac27a0ec
DK		 5594 return 0;
5595out:
24b58424
TT		 5596 unregister_as_ext2();
5597 unregister_as_ext3();
ac27a0ec
DK		 5598 destroy_inodecache();
5599out1:
9c191f70 5600 ext4_mballoc_ready = 0;
5dabfc78 5601 ext4_exit_mballoc();
9c191f70 5602out2:
8f021222 5603 ext4_exit_feat_adverts();
dd68314c 5604out4:
d44651d0
FJ		 5605 if (ext4_proc_root)
5606 remove_proc_entry("fs/ext4", NULL);
6fd058f7 5607 kset_unregister(ext4_kset);
d44651d0 5608out5:
5dabfc78 5609 ext4_exit_system_zone();
d44651d0 5610out6:
5dabfc78 5611 ext4_exit_pageio();
51865fda
ZL		 5612out7:
5613 ext4_exit_es();
5614
ac27a0ec
DK		 5615 return err;
5616}
5617
5dabfc78 5618static void __exit ext4_exit_fs(void)
ac27a0ec 5619{
bfff6873 5620 ext4_destroy_lazyinit_thread();
24b58424
TT		 5621 unregister_as_ext2();
5622 unregister_as_ext3();
03010a33 5623 unregister_filesystem(&ext4_fs_type);
ac27a0ec 5624 destroy_inodecache();
5dabfc78 5625 ext4_exit_mballoc();
8f021222 5626 ext4_exit_feat_adverts();
9f6200bb 5627 remove_proc_entry("fs/ext4", NULL);
3197ebdb 5628 kset_unregister(ext4_kset);
5dabfc78
TT		 5629 ext4_exit_system_zone();
5630 ext4_exit_pageio();
dd12ed14 5631 ext4_exit_es();
ac27a0ec
DK		 5632}
5633
5634MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
83982b6f 5635MODULE_DESCRIPTION("Fourth Extended Filesystem");
ac27a0ec 5636MODULE_LICENSE("GPL");
5dabfc78
TT		 5637module_init(ext4_init_fs)
5638module_exit(ext4_exit_fs)
Ubuntu Artful kernel mirror