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[thirdparty/kernel/linux.git] / fs / ext4 / super.c
CommitLineData
ac27a0ec 1/*
617ba13b 2 * linux/fs/ext4/super.c
ac27a0ec
DK		 3 *
4 * Copyright (C) 1992, 1993, 1994, 1995
5 * Remy Card (card@masi.ibp.fr)
6 * Laboratoire MASI - Institut Blaise Pascal
7 * Universite Pierre et Marie Curie (Paris VI)
8 *
9 * from
10 *
11 * linux/fs/minix/inode.c
12 *
13 * Copyright (C) 1991, 1992 Linus Torvalds
14 *
15 * Big-endian to little-endian byte-swapping/bitmaps by
16 * David S. Miller (davem@caip.rutgers.edu), 1995
17 */
18
19#include <linux/module.h>
20#include <linux/string.h>
21#include <linux/fs.h>
22#include <linux/time.h>
c5ca7c76 23#include <linux/vmalloc.h>
ac27a0ec
DK		 24#include <linux/slab.h>
25#include <linux/init.h>
26#include <linux/blkdev.h>
66114cad 27#include <linux/backing-dev.h>
ac27a0ec 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>
3197ebdb 37#include <linux/ctype.h>
1330593e 38#include <linux/log2.h>
717d50e4 39#include <linux/crc16.h>
7abc52c2 40#include <linux/cleancache.h>
ac27a0ec
DK		 41#include <asm/uaccess.h>
42
bfff6873
LC		 43#include <linux/kthread.h>
44#include <linux/freezer.h>
45
3dcf5451 46#include "ext4.h"
4a092d73 47#include "ext4_extents.h" /* Needed for trace points definition */
3dcf5451 48#include "ext4_jbd2.h"
ac27a0ec
DK		 49#include "xattr.h"
50#include "acl.h"
3661d286 51#include "mballoc.h"
ac27a0ec 52
9bffad1e
TT		 53#define CREATE_TRACE_POINTS
54#include <trace/events/ext4.h>
55
0b75a840
LC		 56static struct ext4_lazy_init *ext4_li_info;
57static struct mutex ext4_li_mtx;
9c191f70 58static int ext4_mballoc_ready;
e294a537 59static struct ratelimit_state ext4_mount_msg_ratelimit;
9f6200bb 60
617ba13b 61static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
ac27a0ec 62 unsigned long journal_devnum);
2adf6da8 63static int ext4_show_options(struct seq_file *seq, struct dentry *root);
e2d67052 64static int ext4_commit_super(struct super_block *sb, int sync);
2b2d6d01
TT		 65static void ext4_mark_recovery_complete(struct super_block *sb,
66 struct ext4_super_block *es);
67static void ext4_clear_journal_err(struct super_block *sb,
68 struct ext4_super_block *es);
617ba13b 69static int ext4_sync_fs(struct super_block *sb, int wait);
2b2d6d01
TT		 70static int ext4_remount(struct super_block *sb, int *flags, char *data);
71static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
c4be0c1d 72static int ext4_unfreeze(struct super_block *sb);
c4be0c1d 73static int ext4_freeze(struct super_block *sb);
152a0836
AV		 74static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
75 const char *dev_name, void *data);
2035e776
TT		 76static inline int ext2_feature_set_ok(struct super_block *sb);
77static inline int ext3_feature_set_ok(struct super_block *sb);
d39195c3 78static int ext4_feature_set_ok(struct super_block *sb, int readonly);
bfff6873
LC		 79static void ext4_destroy_lazyinit_thread(void);
80static void ext4_unregister_li_request(struct super_block *sb);
8f1f7453 81static void ext4_clear_request_list(void);
ac27a0ec 82
c290ea01 83#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2)
2035e776
TT		 84static struct file_system_type ext2_fs_type = {
85 .owner = THIS_MODULE,
86 .name = "ext2",
87 .mount = ext4_mount,
88 .kill_sb = kill_block_super,
89 .fs_flags = FS_REQUIRES_DEV,
90};
7f78e035 91MODULE_ALIAS_FS("ext2");
fa7614dd 92MODULE_ALIAS("ext2");
2035e776
TT		 93#define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type)
94#else
95#define IS_EXT2_SB(sb) (0)
96#endif
97
98
ba69f9ab
JK		 99static struct file_system_type ext3_fs_type = {
100 .owner = THIS_MODULE,
101 .name = "ext3",
152a0836 102 .mount = ext4_mount,
ba69f9ab
JK		 103 .kill_sb = kill_block_super,
104 .fs_flags = FS_REQUIRES_DEV,
105};
7f78e035 106MODULE_ALIAS_FS("ext3");
fa7614dd 107MODULE_ALIAS("ext3");
ba69f9ab 108#define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type)
bd81d8ee 109
d25425f8
DW		 110static int ext4_verify_csum_type(struct super_block *sb,
111 struct ext4_super_block *es)
112{
e2b911c5 113 if (!ext4_has_feature_metadata_csum(sb))
d25425f8
DW		 114 return 1;
115
116 return es->s_checksum_type == EXT4_CRC32C_CHKSUM;
117}
118
a9c47317
DW		 119static __le32 ext4_superblock_csum(struct super_block *sb,
120 struct ext4_super_block *es)
121{
122 struct ext4_sb_info *sbi = EXT4_SB(sb);
123 int offset = offsetof(struct ext4_super_block, s_checksum);
124 __u32 csum;
125
126 csum = ext4_chksum(sbi, ~0, (char *)es, offset);
127
128 return cpu_to_le32(csum);
129}
130
c197855e
SH		 131static int ext4_superblock_csum_verify(struct super_block *sb,
132 struct ext4_super_block *es)
a9c47317 133{
9aa5d32b 134 if (!ext4_has_metadata_csum(sb))
a9c47317
DW		 135 return 1;
136
137 return es->s_checksum == ext4_superblock_csum(sb, es);
138}
139
06db49e6 140void ext4_superblock_csum_set(struct super_block *sb)
a9c47317 141{
06db49e6
TT		 142 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
143
9aa5d32b 144 if (!ext4_has_metadata_csum(sb))
a9c47317
DW		 145 return;
146
147 es->s_checksum = ext4_superblock_csum(sb, es);
148}
149
9933fc0a
TT		 150void *ext4_kvmalloc(size_t size, gfp_t flags)
151{
152 void *ret;
153
8be04b93 154 ret = kmalloc(size, flags | __GFP_NOWARN);
9933fc0a
TT		 155 if (!ret)
156 ret = __vmalloc(size, flags, PAGE_KERNEL);
157 return ret;
158}
159
160void *ext4_kvzalloc(size_t size, gfp_t flags)
161{
162 void *ret;
163
8be04b93 164 ret = kzalloc(size, flags | __GFP_NOWARN);
9933fc0a
TT		 165 if (!ret)
166 ret = __vmalloc(size, flags | __GFP_ZERO, PAGE_KERNEL);
167 return ret;
168}
169
8fadc143
AR		 170ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
171 struct ext4_group_desc *bg)
bd81d8ee 172{
3a14589c 173 return le32_to_cpu(bg->bg_block_bitmap_lo) |
8fadc143 174 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 175 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 176}
177
8fadc143
AR		 178ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
179 struct ext4_group_desc *bg)
bd81d8ee 180{
5272f837 181 return le32_to_cpu(bg->bg_inode_bitmap_lo) |
8fadc143 182 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 183 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 184}
185
8fadc143
AR		 186ext4_fsblk_t ext4_inode_table(struct super_block *sb,
187 struct ext4_group_desc *bg)
bd81d8ee 188{
5272f837 189 return le32_to_cpu(bg->bg_inode_table_lo) |
8fadc143 190 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 191 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
bd81d8ee
LV		 192}
193
021b65bb
TT		 194__u32 ext4_free_group_clusters(struct super_block *sb,
195 struct ext4_group_desc *bg)
560671a0
AK		 196{
197 return le16_to_cpu(bg->bg_free_blocks_count_lo) |
198 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 199 (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0);
560671a0
AK		 200}
201
202__u32 ext4_free_inodes_count(struct super_block *sb,
203 struct ext4_group_desc *bg)
204{
205 return le16_to_cpu(bg->bg_free_inodes_count_lo) |
206 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 207 (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0);
560671a0
AK		 208}
209
210__u32 ext4_used_dirs_count(struct super_block *sb,
211 struct ext4_group_desc *bg)
212{
213 return le16_to_cpu(bg->bg_used_dirs_count_lo) |
214 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 215 (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0);
560671a0
AK		 216}
217
218__u32 ext4_itable_unused_count(struct super_block *sb,
219 struct ext4_group_desc *bg)
220{
221 return le16_to_cpu(bg->bg_itable_unused_lo) |
222 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 223 (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0);
560671a0
AK		 224}
225
8fadc143
AR		 226void ext4_block_bitmap_set(struct super_block *sb,
227 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 228{
3a14589c 229 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 230 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
231 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 232}
233
8fadc143
AR		 234void ext4_inode_bitmap_set(struct super_block *sb,
235 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 236{
5272f837 237 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 238 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
239 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 240}
241
8fadc143
AR		 242void ext4_inode_table_set(struct super_block *sb,
243 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 244{
5272f837 245 bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 246 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
247 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 248}
249
021b65bb
TT		 250void ext4_free_group_clusters_set(struct super_block *sb,
251 struct ext4_group_desc *bg, __u32 count)
560671a0
AK		 252{
253 bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count);
254 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
255 bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16);
256}
257
258void ext4_free_inodes_set(struct super_block *sb,
259 struct ext4_group_desc *bg, __u32 count)
260{
261 bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count);
262 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
263 bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16);
264}
265
266void ext4_used_dirs_set(struct super_block *sb,
267 struct ext4_group_desc *bg, __u32 count)
268{
269 bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count);
270 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
271 bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16);
272}
273
274void ext4_itable_unused_set(struct super_block *sb,
275 struct ext4_group_desc *bg, __u32 count)
276{
277 bg->bg_itable_unused_lo = cpu_to_le16((__u16)count);
278 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
279 bg->bg_itable_unused_hi = cpu_to_le16(count >> 16);
280}
281
d3d1faf6 282
1c13d5c0
TT		 283static void __save_error_info(struct super_block *sb, const char *func,
284 unsigned int line)
285{
286 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
287
288 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
1b46617b
TT		 289 if (bdev_read_only(sb->s_bdev))
290 return;
1c13d5c0
TT		 291 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
292 es->s_last_error_time = cpu_to_le32(get_seconds());
293 strncpy(es->s_last_error_func, func, sizeof(es->s_last_error_func));
294 es->s_last_error_line = cpu_to_le32(line);
295 if (!es->s_first_error_time) {
296 es->s_first_error_time = es->s_last_error_time;
297 strncpy(es->s_first_error_func, func,
298 sizeof(es->s_first_error_func));
299 es->s_first_error_line = cpu_to_le32(line);
300 es->s_first_error_ino = es->s_last_error_ino;
301 es->s_first_error_block = es->s_last_error_block;
302 }
66e61a9e
TT		 303 /*
304 * Start the daily error reporting function if it hasn't been
305 * started already
306 */
307 if (!es->s_error_count)
308 mod_timer(&EXT4_SB(sb)->s_err_report, jiffies + 24*60*60*HZ);
ba39ebb6 309 le32_add_cpu(&es->s_error_count, 1);
1c13d5c0
TT		 310}
311
312static void save_error_info(struct super_block *sb, const char *func,
313 unsigned int line)
314{
315 __save_error_info(sb, func, line);
316 ext4_commit_super(sb, 1);
317}
318
bdfe0cbd
TT		 319/*
320 * The del_gendisk() function uninitializes the disk-specific data
321 * structures, including the bdi structure, without telling anyone
322 * else. Once this happens, any attempt to call mark_buffer_dirty()
323 * (for example, by ext4_commit_super), will cause a kernel OOPS.
324 * This is a kludge to prevent these oops until we can put in a proper
325 * hook in del_gendisk() to inform the VFS and file system layers.
326 */
327static int block_device_ejected(struct super_block *sb)
328{
329 struct inode *bd_inode = sb->s_bdev->bd_inode;
330 struct backing_dev_info *bdi = inode_to_bdi(bd_inode);
331
332 return bdi->dev == NULL;
333}
334
18aadd47
BJ		 335static void ext4_journal_commit_callback(journal_t *journal, transaction_t *txn)
336{
337 struct super_block *sb = journal->j_private;
338 struct ext4_sb_info *sbi = EXT4_SB(sb);
339 int error = is_journal_aborted(journal);
5d3ee208 340 struct ext4_journal_cb_entry *jce;
18aadd47 341
5d3ee208 342 BUG_ON(txn->t_state == T_FINISHED);
18aadd47 343 spin_lock(&sbi->s_md_lock);
5d3ee208
DM		 344 while (!list_empty(&txn->t_private_list)) {
345 jce = list_entry(txn->t_private_list.next,
346 struct ext4_journal_cb_entry, jce_list);
18aadd47
BJ		 347 list_del_init(&jce->jce_list);
348 spin_unlock(&sbi->s_md_lock);
349 jce->jce_func(sb, jce, error);
350 spin_lock(&sbi->s_md_lock);
351 }
352 spin_unlock(&sbi->s_md_lock);
353}
1c13d5c0 354
ac27a0ec
DK		 355/* Deal with the reporting of failure conditions on a filesystem such as
356 * inconsistencies detected or read IO failures.
357 *
358 * On ext2, we can store the error state of the filesystem in the
617ba13b 359 * superblock. That is not possible on ext4, because we may have other
ac27a0ec
DK		 360 * write ordering constraints on the superblock which prevent us from
361 * writing it out straight away; and given that the journal is about to
362 * be aborted, we can't rely on the current, or future, transactions to
363 * write out the superblock safely.
364 *
dab291af 365 * We'll just use the jbd2_journal_abort() error code to record an error in
d6b198bc 366 * the journal instead. On recovery, the journal will complain about
ac27a0ec
DK		 367 * that error until we've noted it down and cleared it.
368 */
369
617ba13b 370static void ext4_handle_error(struct super_block *sb)
ac27a0ec 371{
ac27a0ec
DK		 372 if (sb->s_flags & MS_RDONLY)
373 return;
374
2b2d6d01 375 if (!test_opt(sb, ERRORS_CONT)) {
617ba13b 376 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 377
4ab2f15b 378 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
ac27a0ec 379 if (journal)
dab291af 380 jbd2_journal_abort(journal, -EIO);
ac27a0ec 381 }
2b2d6d01 382 if (test_opt(sb, ERRORS_RO)) {
b31e1552 383 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
4418e141
DM		 384 /*
385 * Make sure updated value of ->s_mount_flags will be visible
386 * before ->s_flags update
387 */
388 smp_wmb();
ac27a0ec
DK		 389 sb->s_flags |= MS_RDONLY;
390 }
4327ba52
DJ		 391 if (test_opt(sb, ERRORS_PANIC)) {
392 if (EXT4_SB(sb)->s_journal &&
393 !(EXT4_SB(sb)->s_journal->j_flags & JBD2_REC_ERR))
394 return;
617ba13b 395 panic("EXT4-fs (device %s): panic forced after error\n",
ac27a0ec 396 sb->s_id);
4327ba52 397 }
ac27a0ec
DK		 398}
399
efbed4dc
TT		 400#define ext4_error_ratelimit(sb) \
401 ___ratelimit(&(EXT4_SB(sb)->s_err_ratelimit_state), \
402 "EXT4-fs error")
403
12062ddd 404void __ext4_error(struct super_block *sb, const char *function,
c398eda0 405 unsigned int line, const char *fmt, ...)
ac27a0ec 406{
0ff2ea7d 407 struct va_format vaf;
ac27a0ec
DK		 408 va_list args;
409
efbed4dc
TT		 410 if (ext4_error_ratelimit(sb)) {
411 va_start(args, fmt);
412 vaf.fmt = fmt;
413 vaf.va = &args;
414 printk(KERN_CRIT
415 "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n",
416 sb->s_id, function, line, current->comm, &vaf);
417 va_end(args);
418 }
f3fc0210 419 save_error_info(sb, function, line);
617ba13b 420 ext4_handle_error(sb);
ac27a0ec
DK		 421}
422
e7c96e8e
JP		 423void __ext4_error_inode(struct inode *inode, const char *function,
424 unsigned int line, ext4_fsblk_t block,
425 const char *fmt, ...)
273df556
FM		 426{
427 va_list args;
f7c21177 428 struct va_format vaf;
1c13d5c0 429 struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
273df556 430
1c13d5c0
TT		 431 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
432 es->s_last_error_block = cpu_to_le64(block);
efbed4dc
TT		 433 if (ext4_error_ratelimit(inode->i_sb)) {
434 va_start(args, fmt);
435 vaf.fmt = fmt;
436 vaf.va = &args;
437 if (block)
438 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
439 "inode #%lu: block %llu: comm %s: %pV\n",
440 inode->i_sb->s_id, function, line, inode->i_ino,
441 block, current->comm, &vaf);
442 else
443 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
444 "inode #%lu: comm %s: %pV\n",
445 inode->i_sb->s_id, function, line, inode->i_ino,
446 current->comm, &vaf);
447 va_end(args);
448 }
1c13d5c0 449 save_error_info(inode->i_sb, function, line);
273df556
FM		 450 ext4_handle_error(inode->i_sb);
451}
452
e7c96e8e
JP		 453void __ext4_error_file(struct file *file, const char *function,
454 unsigned int line, ext4_fsblk_t block,
455 const char *fmt, ...)
273df556
FM		 456{
457 va_list args;
f7c21177 458 struct va_format vaf;
1c13d5c0 459 struct ext4_super_block *es;
496ad9aa 460 struct inode *inode = file_inode(file);
273df556
FM		 461 char pathname[80], *path;
462
1c13d5c0
TT		 463 es = EXT4_SB(inode->i_sb)->s_es;
464 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
efbed4dc 465 if (ext4_error_ratelimit(inode->i_sb)) {
9bf39ab2 466 path = file_path(file, pathname, sizeof(pathname));
efbed4dc
TT		 467 if (IS_ERR(path))
468 path = "(unknown)";
469 va_start(args, fmt);
470 vaf.fmt = fmt;
471 vaf.va = &args;
472 if (block)
473 printk(KERN_CRIT
474 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
475 "block %llu: comm %s: path %s: %pV\n",
476 inode->i_sb->s_id, function, line, inode->i_ino,
477 block, current->comm, path, &vaf);
478 else
479 printk(KERN_CRIT
480 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
481 "comm %s: path %s: %pV\n",
482 inode->i_sb->s_id, function, line, inode->i_ino,
483 current->comm, path, &vaf);
484 va_end(args);
485 }
1c13d5c0 486 save_error_info(inode->i_sb, function, line);
273df556
FM		 487 ext4_handle_error(inode->i_sb);
488}
489
722887dd
TT		 490const char *ext4_decode_error(struct super_block *sb, int errno,
491 char nbuf[16])
ac27a0ec
DK		 492{
493 char *errstr = NULL;
494
495 switch (errno) {
6a797d27
DW		 496 case -EFSCORRUPTED:
497 errstr = "Corrupt filesystem";
498 break;
499 case -EFSBADCRC:
500 errstr = "Filesystem failed CRC";
501 break;
ac27a0ec
DK		 502 case -EIO:
503 errstr = "IO failure";
504 break;
505 case -ENOMEM:
506 errstr = "Out of memory";
507 break;
508 case -EROFS:
78f1ddbb
TT		 509 if (!sb || (EXT4_SB(sb)->s_journal &&
510 EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT))
ac27a0ec
DK		 511 errstr = "Journal has aborted";
512 else
513 errstr = "Readonly filesystem";
514 break;
515 default:
516 /* If the caller passed in an extra buffer for unknown
517 * errors, textualise them now. Else we just return
518 * NULL. */
519 if (nbuf) {
520 /* Check for truncated error codes... */
521 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
522 errstr = nbuf;
523 }
524 break;
525 }
526
527 return errstr;
528}
529
617ba13b 530/* __ext4_std_error decodes expected errors from journaling functions
ac27a0ec
DK		 531 * automatically and invokes the appropriate error response. */
532
c398eda0
TT		 533void __ext4_std_error(struct super_block *sb, const char *function,
534 unsigned int line, int errno)
ac27a0ec
DK		 535{
536 char nbuf[16];
537 const char *errstr;
538
539 /* Special case: if the error is EROFS, and we're not already
540 * inside a transaction, then there's really no point in logging
541 * an error. */
542 if (errno == -EROFS && journal_current_handle() == NULL &&
543 (sb->s_flags & MS_RDONLY))
544 return;
545
efbed4dc
TT		 546 if (ext4_error_ratelimit(sb)) {
547 errstr = ext4_decode_error(sb, errno, nbuf);
548 printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n",
549 sb->s_id, function, line, errstr);
550 }
ac27a0ec 551
efbed4dc 552 save_error_info(sb, function, line);
617ba13b 553 ext4_handle_error(sb);
ac27a0ec
DK		 554}
555
556/*
617ba13b 557 * ext4_abort is a much stronger failure handler than ext4_error. The
ac27a0ec
DK		 558 * abort function may be used to deal with unrecoverable failures such
559 * as journal IO errors or ENOMEM at a critical moment in log management.
560 *
561 * We unconditionally force the filesystem into an ABORT|READONLY state,
562 * unless the error response on the fs has been set to panic in which
563 * case we take the easy way out and panic immediately.
564 */
565
c67d859e 566void __ext4_abort(struct super_block *sb, const char *function,
c398eda0 567 unsigned int line, const char *fmt, ...)
ac27a0ec
DK		 568{
569 va_list args;
570
1c13d5c0 571 save_error_info(sb, function, line);
ac27a0ec 572 va_start(args, fmt);
c398eda0
TT		 573 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: ", sb->s_id,
574 function, line);
ac27a0ec
DK		 575 vprintk(fmt, args);
576 printk("\n");
577 va_end(args);
578
1c13d5c0
TT		 579 if ((sb->s_flags & MS_RDONLY) == 0) {
580 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
1c13d5c0 581 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
4418e141
DM		 582 /*
583 * Make sure updated value of ->s_mount_flags will be visible
584 * before ->s_flags update
585 */
586 smp_wmb();
587 sb->s_flags |= MS_RDONLY;
1c13d5c0
TT		 588 if (EXT4_SB(sb)->s_journal)
589 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
590 save_error_info(sb, function, line);
591 }
4327ba52
DJ		 592 if (test_opt(sb, ERRORS_PANIC)) {
593 if (EXT4_SB(sb)->s_journal &&
594 !(EXT4_SB(sb)->s_journal->j_flags & JBD2_REC_ERR))
595 return;
617ba13b 596 panic("EXT4-fs panic from previous error\n");
4327ba52 597 }
ac27a0ec
DK		 598}
599
e7c96e8e
JP		 600void __ext4_msg(struct super_block *sb,
601 const char *prefix, const char *fmt, ...)
b31e1552 602{
0ff2ea7d 603 struct va_format vaf;
b31e1552
ES		 604 va_list args;
605
efbed4dc
TT		 606 if (!___ratelimit(&(EXT4_SB(sb)->s_msg_ratelimit_state), "EXT4-fs"))
607 return;
608
b31e1552 609 va_start(args, fmt);
0ff2ea7d
JP		 610 vaf.fmt = fmt;
611 vaf.va = &args;
612 printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
b31e1552
ES		 613 va_end(args);
614}
615
b03a2f7e
AD		 616#define ext4_warning_ratelimit(sb) \
617 ___ratelimit(&(EXT4_SB(sb)->s_warning_ratelimit_state), \
618 "EXT4-fs warning")
619
12062ddd 620void __ext4_warning(struct super_block *sb, const char *function,
c398eda0 621 unsigned int line, const char *fmt, ...)
ac27a0ec 622{
0ff2ea7d 623 struct va_format vaf;
ac27a0ec
DK		 624 va_list args;
625
b03a2f7e 626 if (!ext4_warning_ratelimit(sb))
efbed4dc
TT		 627 return;
628
ac27a0ec 629 va_start(args, fmt);
0ff2ea7d
JP		 630 vaf.fmt = fmt;
631 vaf.va = &args;
632 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: %pV\n",
633 sb->s_id, function, line, &vaf);
ac27a0ec
DK		 634 va_end(args);
635}
636
b03a2f7e
AD		 637void __ext4_warning_inode(const struct inode *inode, const char *function,
638 unsigned int line, const char *fmt, ...)
639{
640 struct va_format vaf;
641 va_list args;
642
643 if (!ext4_warning_ratelimit(inode->i_sb))
644 return;
645
646 va_start(args, fmt);
647 vaf.fmt = fmt;
648 vaf.va = &args;
649 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: "
650 "inode #%lu: comm %s: %pV\n", inode->i_sb->s_id,
651 function, line, inode->i_ino, current->comm, &vaf);
652 va_end(args);
653}
654
e29136f8
TT		 655void __ext4_grp_locked_error(const char *function, unsigned int line,
656 struct super_block *sb, ext4_group_t grp,
657 unsigned long ino, ext4_fsblk_t block,
658 const char *fmt, ...)
5d1b1b3f
AK		 659__releases(bitlock)
660__acquires(bitlock)
661{
0ff2ea7d 662 struct va_format vaf;
5d1b1b3f
AK		 663 va_list args;
664 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
665
1c13d5c0
TT		 666 es->s_last_error_ino = cpu_to_le32(ino);
667 es->s_last_error_block = cpu_to_le64(block);
668 __save_error_info(sb, function, line);
0ff2ea7d 669
efbed4dc
TT		 670 if (ext4_error_ratelimit(sb)) {
671 va_start(args, fmt);
672 vaf.fmt = fmt;
673 vaf.va = &args;
674 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u, ",
675 sb->s_id, function, line, grp);
676 if (ino)
677 printk(KERN_CONT "inode %lu: ", ino);
678 if (block)
679 printk(KERN_CONT "block %llu:",
680 (unsigned long long) block);
681 printk(KERN_CONT "%pV\n", &vaf);
682 va_end(args);
683 }
5d1b1b3f
AK		 684
685 if (test_opt(sb, ERRORS_CONT)) {
e2d67052 686 ext4_commit_super(sb, 0);
5d1b1b3f
AK		 687 return;
688 }
1c13d5c0 689
5d1b1b3f
AK		 690 ext4_unlock_group(sb, grp);
691 ext4_handle_error(sb);
692 /*
693 * We only get here in the ERRORS_RO case; relocking the group
694 * may be dangerous, but nothing bad will happen since the
695 * filesystem will have already been marked read/only and the
696 * journal has been aborted. We return 1 as a hint to callers
697 * who might what to use the return value from
25985edc 698 * ext4_grp_locked_error() to distinguish between the
5d1b1b3f
AK		 699 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
700 * aggressively from the ext4 function in question, with a
701 * more appropriate error code.
702 */
703 ext4_lock_group(sb, grp);
704 return;
705}
706
617ba13b 707void ext4_update_dynamic_rev(struct super_block *sb)
ac27a0ec 708{
617ba13b 709 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
ac27a0ec 710
617ba13b 711 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
ac27a0ec
DK		 712 return;
713
12062ddd 714 ext4_warning(sb,
ac27a0ec
DK		 715 "updating to rev %d because of new feature flag, "
716 "running e2fsck is recommended",
617ba13b 717 EXT4_DYNAMIC_REV);
ac27a0ec 718
617ba13b
MC		 719 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
720 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
721 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
ac27a0ec
DK		 722 /* leave es->s_feature_*compat flags alone */
723 /* es->s_uuid will be set by e2fsck if empty */
724
725 /*
726 * The rest of the superblock fields should be zero, and if not it
727 * means they are likely already in use, so leave them alone. We
728 * can leave it up to e2fsck to clean up any inconsistencies there.
729 */
730}
731
732/*
733 * Open the external journal device
734 */
b31e1552 735static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb)
ac27a0ec
DK		 736{
737 struct block_device *bdev;
738 char b[BDEVNAME_SIZE];
739
d4d77629 740 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
ac27a0ec
DK		 741 if (IS_ERR(bdev))
742 goto fail;
743 return bdev;
744
745fail:
b31e1552 746 ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld",
ac27a0ec
DK		 747 __bdevname(dev, b), PTR_ERR(bdev));
748 return NULL;
749}
750
751/*
752 * Release the journal device
753 */
4385bab1 754static void ext4_blkdev_put(struct block_device *bdev)
ac27a0ec 755{
4385bab1 756 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
ac27a0ec
DK		 757}
758
4385bab1 759static void ext4_blkdev_remove(struct ext4_sb_info *sbi)
ac27a0ec
DK		 760{
761 struct block_device *bdev;
ac27a0ec
DK		 762 bdev = sbi->journal_bdev;
763 if (bdev) {
4385bab1 764 ext4_blkdev_put(bdev);
ac27a0ec
DK		 765 sbi->journal_bdev = NULL;
766 }
ac27a0ec
DK		 767}
768
769static inline struct inode *orphan_list_entry(struct list_head *l)
770{
617ba13b 771 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
ac27a0ec
DK		 772}
773
617ba13b 774static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
ac27a0ec
DK		 775{
776 struct list_head *l;
777
b31e1552
ES		 778 ext4_msg(sb, KERN_ERR, "sb orphan head is %d",
779 le32_to_cpu(sbi->s_es->s_last_orphan));
ac27a0ec
DK		 780
781 printk(KERN_ERR "sb_info orphan list:\n");
782 list_for_each(l, &sbi->s_orphan) {
783 struct inode *inode = orphan_list_entry(l);
784 printk(KERN_ERR " "
785 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
786 inode->i_sb->s_id, inode->i_ino, inode,
787 inode->i_mode, inode->i_nlink,
788 NEXT_ORPHAN(inode));
789 }
790}
791
2b2d6d01 792static void ext4_put_super(struct super_block *sb)
ac27a0ec 793{
617ba13b
MC		 794 struct ext4_sb_info *sbi = EXT4_SB(sb);
795 struct ext4_super_block *es = sbi->s_es;
ef2cabf7 796 int i, err;
ac27a0ec 797
857ac889 798 ext4_unregister_li_request(sb);
e0ccfd95
CH		 799 dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
800
2e8fa54e 801 flush_workqueue(sbi->rsv_conversion_wq);
2e8fa54e 802 destroy_workqueue(sbi->rsv_conversion_wq);
4c0425ff 803
0390131b
FM		 804 if (sbi->s_journal) {
805 err = jbd2_journal_destroy(sbi->s_journal);
806 sbi->s_journal = NULL;
807 if (err < 0)
c67d859e 808 ext4_abort(sb, "Couldn't clean up the journal");
0390131b 809 }
d4edac31 810
ebd173be 811 ext4_unregister_sysfs(sb);
d3922a77 812 ext4_es_unregister_shrinker(sbi);
9105bb14 813 del_timer_sync(&sbi->s_err_report);
d4edac31
JB		 814 ext4_release_system_zone(sb);
815 ext4_mb_release(sb);
816 ext4_ext_release(sb);
817 ext4_xattr_put_super(sb);
818
ac27a0ec 819 if (!(sb->s_flags & MS_RDONLY)) {
e2b911c5 820 ext4_clear_feature_journal_needs_recovery(sb);
ac27a0ec 821 es->s_state = cpu_to_le16(sbi->s_mount_state);
ac27a0ec 822 }
58c5873a 823 if (!(sb->s_flags & MS_RDONLY))
a8e25a83
AB		 824 ext4_commit_super(sb, 1);
825
ac27a0ec
DK		 826 for (i = 0; i < sbi->s_gdb_count; i++)
827 brelse(sbi->s_group_desc[i]);
b93b41d4
AV		 828 kvfree(sbi->s_group_desc);
829 kvfree(sbi->s_flex_groups);
57042651 830 percpu_counter_destroy(&sbi->s_freeclusters_counter);
ac27a0ec
DK		 831 percpu_counter_destroy(&sbi->s_freeinodes_counter);
832 percpu_counter_destroy(&sbi->s_dirs_counter);
57042651 833 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
ac27a0ec
DK		 834 brelse(sbi->s_sbh);
835#ifdef CONFIG_QUOTA
a2d4a646 836 for (i = 0; i < EXT4_MAXQUOTAS; i++)
ac27a0ec
DK		 837 kfree(sbi->s_qf_names[i]);
838#endif
839
840 /* Debugging code just in case the in-memory inode orphan list
841 * isn't empty. The on-disk one can be non-empty if we've
842 * detected an error and taken the fs readonly, but the
843 * in-memory list had better be clean by this point. */
844 if (!list_empty(&sbi->s_orphan))
845 dump_orphan_list(sb, sbi);
846 J_ASSERT(list_empty(&sbi->s_orphan));
847
89d96a6f 848 sync_blockdev(sb->s_bdev);
f98393a6 849 invalidate_bdev(sb->s_bdev);
ac27a0ec
DK		 850 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
851 /*
852 * Invalidate the journal device's buffers. We don't want them
853 * floating about in memory - the physical journal device may
854 * hotswapped, and it breaks the `ro-after' testing code.
855 */
856 sync_blockdev(sbi->journal_bdev);
f98393a6 857 invalidate_bdev(sbi->journal_bdev);
617ba13b 858 ext4_blkdev_remove(sbi);
ac27a0ec 859 }
9c191f70
M		 860 if (sbi->s_mb_cache) {
861 ext4_xattr_destroy_cache(sbi->s_mb_cache);
862 sbi->s_mb_cache = NULL;
863 }
c5e06d10
JL		 864 if (sbi->s_mmp_tsk)
865 kthread_stop(sbi->s_mmp_tsk);
ac27a0ec 866 sb->s_fs_info = NULL;
3197ebdb
TT		 867 /*
868 * Now that we are completely done shutting down the
869 * superblock, we need to actually destroy the kobject.
870 */
3197ebdb
TT		 871 kobject_put(&sbi->s_kobj);
872 wait_for_completion(&sbi->s_kobj_unregister);
0441984a
DW		 873 if (sbi->s_chksum_driver)
874 crypto_free_shash(sbi->s_chksum_driver);
705895b6 875 kfree(sbi->s_blockgroup_lock);
ac27a0ec 876 kfree(sbi);
ac27a0ec
DK		 877}
878
e18b890b 879static struct kmem_cache *ext4_inode_cachep;
ac27a0ec
DK		 880
881/*
882 * Called inside transaction, so use GFP_NOFS
883 */
617ba13b 884static struct inode *ext4_alloc_inode(struct super_block *sb)
ac27a0ec 885{
617ba13b 886 struct ext4_inode_info *ei;
ac27a0ec 887
e6b4f8da 888 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
ac27a0ec
DK		 889 if (!ei)
890 return NULL;
0b8e58a1 891
ac27a0ec 892 ei->vfs_inode.i_version = 1;
202ee5df 893 spin_lock_init(&ei->i_raw_lock);
c9de560d
AT		 894 INIT_LIST_HEAD(&ei->i_prealloc_list);
895 spin_lock_init(&ei->i_prealloc_lock);
9a26b661
ZL		 896 ext4_es_init_tree(&ei->i_es_tree);
897 rwlock_init(&ei->i_es_lock);
edaa53ca 898 INIT_LIST_HEAD(&ei->i_es_list);
eb68d0e2 899 ei->i_es_all_nr = 0;
edaa53ca 900 ei->i_es_shk_nr = 0;
dd475925 901 ei->i_es_shrink_lblk = 0;
d2a17637
MC		 902 ei->i_reserved_data_blocks = 0;
903 ei->i_reserved_meta_blocks = 0;
904 ei->i_allocated_meta_blocks = 0;
9d0be502 905 ei->i_da_metadata_calc_len = 0;
7e731bc9 906 ei->i_da_metadata_calc_last_lblock = 0;
d2a17637 907 spin_lock_init(&(ei->i_block_reservation_lock));
a9e7f447
DM		 908#ifdef CONFIG_QUOTA
909 ei->i_reserved_quota = 0;
96c7e0d9 910 memset(&ei->i_dquot, 0, sizeof(ei->i_dquot));
a9e7f447 911#endif
8aefcd55 912 ei->jinode = NULL;
2e8fa54e 913 INIT_LIST_HEAD(&ei->i_rsv_conversion_list);
744692dc 914 spin_lock_init(&ei->i_completed_io_lock);
b436b9be
JK		 915 ei->i_sync_tid = 0;
916 ei->i_datasync_tid = 0;
f7ad6d2e 917 atomic_set(&ei->i_ioend_count, 0);
e27f41e1 918 atomic_set(&ei->i_unwritten, 0);
2e8fa54e 919 INIT_WORK(&ei->i_rsv_conversion_work, ext4_end_io_rsv_work);
b30ab0e0 920#ifdef CONFIG_EXT4_FS_ENCRYPTION
b7236e21 921 ei->i_crypt_info = NULL;
b30ab0e0 922#endif
ac27a0ec
DK		 923 return &ei->vfs_inode;
924}
925
7ff9c073
TT		 926static int ext4_drop_inode(struct inode *inode)
927{
928 int drop = generic_drop_inode(inode);
929
930 trace_ext4_drop_inode(inode, drop);
931 return drop;
932}
933
fa0d7e3d
NP		 934static void ext4_i_callback(struct rcu_head *head)
935{
936 struct inode *inode = container_of(head, struct inode, i_rcu);
fa0d7e3d
NP		 937 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
938}
939
617ba13b 940static void ext4_destroy_inode(struct inode *inode)
ac27a0ec 941{
9f7dd93d 942 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
b31e1552
ES		 943 ext4_msg(inode->i_sb, KERN_ERR,
944 "Inode %lu (%p): orphan list check failed!",
945 inode->i_ino, EXT4_I(inode));
9f7dd93d
VA		 946 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
947 EXT4_I(inode), sizeof(struct ext4_inode_info),
948 true);
949 dump_stack();
950 }
fa0d7e3d 951 call_rcu(&inode->i_rcu, ext4_i_callback);
ac27a0ec
DK		 952}
953
51cc5068 954static void init_once(void *foo)
ac27a0ec 955{
617ba13b 956 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
ac27a0ec 957
a35afb83 958 INIT_LIST_HEAD(&ei->i_orphan);
a35afb83 959 init_rwsem(&ei->xattr_sem);
0e855ac8 960 init_rwsem(&ei->i_data_sem);
a35afb83 961 inode_init_once(&ei->vfs_inode);
ac27a0ec
DK		 962}
963
e67bc2b3 964static int __init init_inodecache(void)
ac27a0ec 965{
617ba13b
MC		 966 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
967 sizeof(struct ext4_inode_info),
ac27a0ec
DK		 968 0, (SLAB_RECLAIM_ACCOUNT|
969 SLAB_MEM_SPREAD),
20c2df83 970 init_once);
617ba13b 971 if (ext4_inode_cachep == NULL)
ac27a0ec
DK		 972 return -ENOMEM;
973 return 0;
974}
975
976static void destroy_inodecache(void)
977{
8c0a8537
KS		 978 /*
979 * Make sure all delayed rcu free inodes are flushed before we
980 * destroy cache.
981 */
982 rcu_barrier();
617ba13b 983 kmem_cache_destroy(ext4_inode_cachep);
ac27a0ec
DK		 984}
985
0930fcc1 986void ext4_clear_inode(struct inode *inode)
ac27a0ec 987{
0930fcc1 988 invalidate_inode_buffers(inode);
dbd5768f 989 clear_inode(inode);
9f754758 990 dquot_drop(inode);
c2ea3fde 991 ext4_discard_preallocations(inode);
51865fda 992 ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS);
8aefcd55
TT		 993 if (EXT4_I(inode)->jinode) {
994 jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode),
995 EXT4_I(inode)->jinode);
996 jbd2_free_inode(EXT4_I(inode)->jinode);
997 EXT4_I(inode)->jinode = NULL;
998 }
b7236e21
TT		 999#ifdef CONFIG_EXT4_FS_ENCRYPTION
1000 if (EXT4_I(inode)->i_crypt_info)
c936e1ec 1001 ext4_free_encryption_info(inode, EXT4_I(inode)->i_crypt_info);
b7236e21 1002#endif
ac27a0ec
DK		 1003}
1004
1b961ac0 1005static struct inode *ext4_nfs_get_inode(struct super_block *sb,
0b8e58a1 1006 u64 ino, u32 generation)
ac27a0ec 1007{
ac27a0ec 1008 struct inode *inode;
ac27a0ec 1009
617ba13b 1010 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
ac27a0ec 1011 return ERR_PTR(-ESTALE);
617ba13b 1012 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
ac27a0ec
DK		 1013 return ERR_PTR(-ESTALE);
1014
1015 /* iget isn't really right if the inode is currently unallocated!!
1016 *
617ba13b 1017 * ext4_read_inode will return a bad_inode if the inode had been
ac27a0ec
DK		 1018 * deleted, so we should be safe.
1019 *
1020 * Currently we don't know the generation for parent directory, so
1021 * a generation of 0 means "accept any"
1022 */
f4bb2981 1023 inode = ext4_iget_normal(sb, ino);
1d1fe1ee
DH		 1024 if (IS_ERR(inode))
1025 return ERR_CAST(inode);
1026 if (generation && inode->i_generation != generation) {
ac27a0ec
DK		 1027 iput(inode);
1028 return ERR_PTR(-ESTALE);
1029 }
1b961ac0
CH		 1030
1031 return inode;
1032}
1033
1034static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
0b8e58a1 1035 int fh_len, int fh_type)
1b961ac0
CH		 1036{
1037 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
1038 ext4_nfs_get_inode);
1039}
1040
1041static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
0b8e58a1 1042 int fh_len, int fh_type)
1b961ac0
CH		 1043{
1044 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
1045 ext4_nfs_get_inode);
ac27a0ec
DK		 1046}
1047
c39a7f84
TO		 1048/*
1049 * Try to release metadata pages (indirect blocks, directories) which are
1050 * mapped via the block device. Since these pages could have journal heads
1051 * which would prevent try_to_free_buffers() from freeing them, we must use
1052 * jbd2 layer's try_to_free_buffers() function to release them.
1053 */
0b8e58a1
AD		 1054static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
1055 gfp_t wait)
c39a7f84
TO		 1056{
1057 journal_t *journal = EXT4_SB(sb)->s_journal;
1058
1059 WARN_ON(PageChecked(page));
1060 if (!page_has_buffers(page))
1061 return 0;
1062 if (journal)
1063 return jbd2_journal_try_to_free_buffers(journal, page,
d0164adc 1064 wait & ~__GFP_DIRECT_RECLAIM);
c39a7f84
TO		 1065 return try_to_free_buffers(page);
1066}
1067
ac27a0ec 1068#ifdef CONFIG_QUOTA
af5bc92d 1069#define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
2b2d6d01 1070#define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
ac27a0ec 1071
617ba13b
MC		 1072static int ext4_write_dquot(struct dquot *dquot);
1073static int ext4_acquire_dquot(struct dquot *dquot);
1074static int ext4_release_dquot(struct dquot *dquot);
1075static int ext4_mark_dquot_dirty(struct dquot *dquot);
1076static int ext4_write_info(struct super_block *sb, int type);
6f28e087 1077static int ext4_quota_on(struct super_block *sb, int type, int format_id,
f00c9e44 1078 struct path *path);
ca0e05e4 1079static int ext4_quota_off(struct super_block *sb, int type);
617ba13b
MC		 1080static int ext4_quota_on_mount(struct super_block *sb, int type);
1081static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec 1082 size_t len, loff_t off);
617ba13b 1083static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec 1084 const char *data, size_t len, loff_t off);
7c319d32
AK		 1085static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
1086 unsigned int flags);
1087static int ext4_enable_quotas(struct super_block *sb);
ac27a0ec 1088
96c7e0d9
JK		 1089static struct dquot **ext4_get_dquots(struct inode *inode)
1090{
1091 return EXT4_I(inode)->i_dquot;
1092}
1093
61e225dc 1094static const struct dquot_operations ext4_quota_operations = {
60e58e0f 1095 .get_reserved_space = ext4_get_reserved_space,
617ba13b
MC		 1096 .write_dquot = ext4_write_dquot,
1097 .acquire_dquot = ext4_acquire_dquot,
1098 .release_dquot = ext4_release_dquot,
1099 .mark_dirty = ext4_mark_dquot_dirty,
a5b5ee32
JK		 1100 .write_info = ext4_write_info,
1101 .alloc_dquot = dquot_alloc,
1102 .destroy_dquot = dquot_destroy,
ac27a0ec
DK		 1103};
1104
0d54b217 1105static const struct quotactl_ops ext4_qctl_operations = {
617ba13b 1106 .quota_on = ext4_quota_on,
ca0e05e4 1107 .quota_off = ext4_quota_off,
287a8095 1108 .quota_sync = dquot_quota_sync,
0a240339 1109 .get_state = dquot_get_state,
287a8095
CH		 1110 .set_info = dquot_set_dqinfo,
1111 .get_dqblk = dquot_get_dqblk,
1112 .set_dqblk = dquot_set_dqblk
ac27a0ec
DK		 1113};
1114#endif
1115
ee9b6d61 1116static const struct super_operations ext4_sops = {
617ba13b
MC		 1117 .alloc_inode = ext4_alloc_inode,
1118 .destroy_inode = ext4_destroy_inode,
617ba13b
MC		 1119 .write_inode = ext4_write_inode,
1120 .dirty_inode = ext4_dirty_inode,
7ff9c073 1121 .drop_inode = ext4_drop_inode,
0930fcc1 1122 .evict_inode = ext4_evict_inode,
617ba13b 1123 .put_super = ext4_put_super,
617ba13b 1124 .sync_fs = ext4_sync_fs,
c4be0c1d
TS		 1125 .freeze_fs = ext4_freeze,
1126 .unfreeze_fs = ext4_unfreeze,
617ba13b
MC		 1127 .statfs = ext4_statfs,
1128 .remount_fs = ext4_remount,
617ba13b 1129 .show_options = ext4_show_options,
ac27a0ec 1130#ifdef CONFIG_QUOTA
617ba13b
MC		 1131 .quota_read = ext4_quota_read,
1132 .quota_write = ext4_quota_write,
96c7e0d9 1133 .get_dquots = ext4_get_dquots,
ac27a0ec 1134#endif
c39a7f84 1135 .bdev_try_to_free_page = bdev_try_to_free_page,
ac27a0ec
DK		 1136};
1137
39655164 1138static const struct export_operations ext4_export_ops = {
1b961ac0
CH		 1139 .fh_to_dentry = ext4_fh_to_dentry,
1140 .fh_to_parent = ext4_fh_to_parent,
617ba13b 1141 .get_parent = ext4_get_parent,
ac27a0ec
DK		 1142};
1143
1144enum {
1145 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
1146 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
72578c33 1147 Opt_nouid32, Opt_debug, Opt_removed,
ac27a0ec 1148 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
72578c33 1149 Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload,
ad4eec61
ES		 1150 Opt_commit, Opt_min_batch_time, Opt_max_batch_time, Opt_journal_dev,
1151 Opt_journal_path, Opt_journal_checksum, Opt_journal_async_commit,
ac27a0ec 1152 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
6ddb2447 1153 Opt_data_err_abort, Opt_data_err_ignore, Opt_test_dummy_encryption,
ac27a0ec 1154 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
5a20bdfc 1155 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
ee4a3fcd 1156 Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err,
923ae0ff 1157 Opt_usrquota, Opt_grpquota, Opt_i_version, Opt_dax,
1449032b 1158 Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_mblk_io_submit,
a26f4992 1159 Opt_lazytime, Opt_nolazytime,
1449032b 1160 Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity,
5328e635 1161 Opt_inode_readahead_blks, Opt_journal_ioprio,
744692dc 1162 Opt_dioread_nolock, Opt_dioread_lock,
fc6cb1cd 1163 Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable,
c6d3d56d 1164 Opt_max_dir_size_kb, Opt_nojournal_checksum,
ac27a0ec
DK		 1165};
1166
a447c093 1167static const match_table_t tokens = {
ac27a0ec
DK		 1168 {Opt_bsd_df, "bsddf"},
1169 {Opt_minix_df, "minixdf"},
1170 {Opt_grpid, "grpid"},
1171 {Opt_grpid, "bsdgroups"},
1172 {Opt_nogrpid, "nogrpid"},
1173 {Opt_nogrpid, "sysvgroups"},
1174 {Opt_resgid, "resgid=%u"},
1175 {Opt_resuid, "resuid=%u"},
1176 {Opt_sb, "sb=%u"},
1177 {Opt_err_cont, "errors=continue"},
1178 {Opt_err_panic, "errors=panic"},
1179 {Opt_err_ro, "errors=remount-ro"},
1180 {Opt_nouid32, "nouid32"},
ac27a0ec 1181 {Opt_debug, "debug"},
72578c33
TT		 1182 {Opt_removed, "oldalloc"},
1183 {Opt_removed, "orlov"},
ac27a0ec
DK		 1184 {Opt_user_xattr, "user_xattr"},
1185 {Opt_nouser_xattr, "nouser_xattr"},
1186 {Opt_acl, "acl"},
1187 {Opt_noacl, "noacl"},
e3bb52ae 1188 {Opt_noload, "norecovery"},
5a916be1 1189 {Opt_noload, "noload"},
72578c33
TT		 1190 {Opt_removed, "nobh"},
1191 {Opt_removed, "bh"},
ac27a0ec 1192 {Opt_commit, "commit=%u"},
30773840
TT		 1193 {Opt_min_batch_time, "min_batch_time=%u"},
1194 {Opt_max_batch_time, "max_batch_time=%u"},
ac27a0ec 1195 {Opt_journal_dev, "journal_dev=%u"},
ad4eec61 1196 {Opt_journal_path, "journal_path=%s"},
818d276c 1197 {Opt_journal_checksum, "journal_checksum"},
c6d3d56d 1198 {Opt_nojournal_checksum, "nojournal_checksum"},
818d276c 1199 {Opt_journal_async_commit, "journal_async_commit"},
ac27a0ec
DK		 1200 {Opt_abort, "abort"},
1201 {Opt_data_journal, "data=journal"},
1202 {Opt_data_ordered, "data=ordered"},
1203 {Opt_data_writeback, "data=writeback"},
5bf5683a
HK		 1204 {Opt_data_err_abort, "data_err=abort"},
1205 {Opt_data_err_ignore, "data_err=ignore"},
ac27a0ec
DK		 1206 {Opt_offusrjquota, "usrjquota="},
1207 {Opt_usrjquota, "usrjquota=%s"},
1208 {Opt_offgrpjquota, "grpjquota="},
1209 {Opt_grpjquota, "grpjquota=%s"},
1210 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
1211 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
5a20bdfc 1212 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
ac27a0ec
DK		 1213 {Opt_grpquota, "grpquota"},
1214 {Opt_noquota, "noquota"},
1215 {Opt_quota, "quota"},
1216 {Opt_usrquota, "usrquota"},
1217 {Opt_barrier, "barrier=%u"},
06705bff
TT		 1218 {Opt_barrier, "barrier"},
1219 {Opt_nobarrier, "nobarrier"},
25ec56b5 1220 {Opt_i_version, "i_version"},
923ae0ff 1221 {Opt_dax, "dax"},
c9de560d 1222 {Opt_stripe, "stripe=%u"},
64769240 1223 {Opt_delalloc, "delalloc"},
a26f4992
TT		 1224 {Opt_lazytime, "lazytime"},
1225 {Opt_nolazytime, "nolazytime"},
dd919b98 1226 {Opt_nodelalloc, "nodelalloc"},
36ade451
JK		 1227 {Opt_removed, "mblk_io_submit"},
1228 {Opt_removed, "nomblk_io_submit"},
6fd058f7
TT		 1229 {Opt_block_validity, "block_validity"},
1230 {Opt_noblock_validity, "noblock_validity"},
240799cd 1231 {Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
b3881f74 1232 {Opt_journal_ioprio, "journal_ioprio=%u"},
afd4672d 1233 {Opt_auto_da_alloc, "auto_da_alloc=%u"},
06705bff
TT		 1234 {Opt_auto_da_alloc, "auto_da_alloc"},
1235 {Opt_noauto_da_alloc, "noauto_da_alloc"},
744692dc
JZ		 1236 {Opt_dioread_nolock, "dioread_nolock"},
1237 {Opt_dioread_lock, "dioread_lock"},
5328e635
ES		 1238 {Opt_discard, "discard"},
1239 {Opt_nodiscard, "nodiscard"},
fc6cb1cd
TT		 1240 {Opt_init_itable, "init_itable=%u"},
1241 {Opt_init_itable, "init_itable"},
1242 {Opt_noinit_itable, "noinit_itable"},
df981d03 1243 {Opt_max_dir_size_kb, "max_dir_size_kb=%u"},
6ddb2447 1244 {Opt_test_dummy_encryption, "test_dummy_encryption"},
c7198b9c
TT		 1245 {Opt_removed, "check=none"}, /* mount option from ext2/3 */
1246 {Opt_removed, "nocheck"}, /* mount option from ext2/3 */
1247 {Opt_removed, "reservation"}, /* mount option from ext2/3 */
1248 {Opt_removed, "noreservation"}, /* mount option from ext2/3 */
1249 {Opt_removed, "journal=%u"}, /* mount option from ext2/3 */
f3f12faa 1250 {Opt_err, NULL},
ac27a0ec
DK		 1251};
1252
617ba13b 1253static ext4_fsblk_t get_sb_block(void **data)
ac27a0ec 1254{
617ba13b 1255 ext4_fsblk_t sb_block;
ac27a0ec
DK		 1256 char *options = (char *) *data;
1257
1258 if (!options || strncmp(options, "sb=", 3) != 0)
1259 return 1; /* Default location */
0b8e58a1 1260
ac27a0ec 1261 options += 3;
0b8e58a1 1262 /* TODO: use simple_strtoll with >32bit ext4 */
ac27a0ec
DK		 1263 sb_block = simple_strtoul(options, &options, 0);
1264 if (*options && *options != ',') {
4776004f 1265 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
ac27a0ec
DK		 1266 (char *) *data);
1267 return 1;
1268 }
1269 if (*options == ',')
1270 options++;
1271 *data = (void *) options;
0b8e58a1 1272
ac27a0ec
DK		 1273 return sb_block;
1274}
1275
b3881f74 1276#define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
437ca0fd
DM		 1277static char deprecated_msg[] = "Mount option \"%s\" will be removed by %s\n"
1278 "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
b3881f74 1279
56c50f11
DM		 1280#ifdef CONFIG_QUOTA
1281static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
1282{
1283 struct ext4_sb_info *sbi = EXT4_SB(sb);
1284 char *qname;
03dafb5f 1285 int ret = -1;
56c50f11
DM		 1286
1287 if (sb_any_quota_loaded(sb) &&
1288 !sbi->s_qf_names[qtype]) {
1289 ext4_msg(sb, KERN_ERR,
1290 "Cannot change journaled "
1291 "quota options when quota turned on");
57f73c2c 1292 return -1;
56c50f11 1293 }
e2b911c5 1294 if (ext4_has_feature_quota(sb)) {
262b4662
JK		 1295 ext4_msg(sb, KERN_ERR, "Cannot set journaled quota options "
1296 "when QUOTA feature is enabled");
1297 return -1;
1298 }
56c50f11
DM		 1299 qname = match_strdup(args);
1300 if (!qname) {
1301 ext4_msg(sb, KERN_ERR,
1302 "Not enough memory for storing quotafile name");
57f73c2c 1303 return -1;
56c50f11 1304 }
03dafb5f
CG		 1305 if (sbi->s_qf_names[qtype]) {
1306 if (strcmp(sbi->s_qf_names[qtype], qname) == 0)
1307 ret = 1;
1308 else
1309 ext4_msg(sb, KERN_ERR,
1310 "%s quota file already specified",
1311 QTYPE2NAME(qtype));
1312 goto errout;
56c50f11 1313 }
03dafb5f 1314 if (strchr(qname, '/')) {
56c50f11
DM		 1315 ext4_msg(sb, KERN_ERR,
1316 "quotafile must be on filesystem root");
03dafb5f 1317 goto errout;
56c50f11 1318 }
03dafb5f 1319 sbi->s_qf_names[qtype] = qname;
fd8c37ec 1320 set_opt(sb, QUOTA);
56c50f11 1321 return 1;
03dafb5f
CG		 1322errout:
1323 kfree(qname);
1324 return ret;
56c50f11
DM		 1325}
1326
1327static int clear_qf_name(struct super_block *sb, int qtype)
1328{
1329
1330 struct ext4_sb_info *sbi = EXT4_SB(sb);
1331
1332 if (sb_any_quota_loaded(sb) &&
1333 sbi->s_qf_names[qtype]) {
1334 ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options"
1335 " when quota turned on");
57f73c2c 1336 return -1;
56c50f11 1337 }
03dafb5f 1338 kfree(sbi->s_qf_names[qtype]);
56c50f11
DM		 1339 sbi->s_qf_names[qtype] = NULL;
1340 return 1;
1341}
1342#endif
1343
26092bf5
TT		 1344#define MOPT_SET 0x0001
1345#define MOPT_CLEAR 0x0002
1346#define MOPT_NOSUPPORT 0x0004
1347#define MOPT_EXPLICIT 0x0008
1348#define MOPT_CLEAR_ERR 0x0010
1349#define MOPT_GTE0 0x0020
ac27a0ec 1350#ifdef CONFIG_QUOTA
26092bf5
TT		 1351#define MOPT_Q 0
1352#define MOPT_QFMT 0x0040
1353#else
1354#define MOPT_Q MOPT_NOSUPPORT
1355#define MOPT_QFMT MOPT_NOSUPPORT
ac27a0ec 1356#endif
26092bf5 1357#define MOPT_DATAJ 0x0080
8dc0aa8c
TT		 1358#define MOPT_NO_EXT2 0x0100
1359#define MOPT_NO_EXT3 0x0200
1360#define MOPT_EXT4_ONLY (MOPT_NO_EXT2 | MOPT_NO_EXT3)
ad4eec61 1361#define MOPT_STRING 0x0400
26092bf5
TT		 1362
1363static const struct mount_opts {
1364 int token;
1365 int mount_opt;
1366 int flags;
1367} ext4_mount_opts[] = {
1368 {Opt_minix_df, EXT4_MOUNT_MINIX_DF, MOPT_SET},
1369 {Opt_bsd_df, EXT4_MOUNT_MINIX_DF, MOPT_CLEAR},
1370 {Opt_grpid, EXT4_MOUNT_GRPID, MOPT_SET},
1371 {Opt_nogrpid, EXT4_MOUNT_GRPID, MOPT_CLEAR},
26092bf5
TT		 1372 {Opt_block_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_SET},
1373 {Opt_noblock_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_CLEAR},
8dc0aa8c
TT		 1374 {Opt_dioread_nolock, EXT4_MOUNT_DIOREAD_NOLOCK,
1375 MOPT_EXT4_ONLY | MOPT_SET},
1376 {Opt_dioread_lock, EXT4_MOUNT_DIOREAD_NOLOCK,
1377 MOPT_EXT4_ONLY | MOPT_CLEAR},
26092bf5
TT		 1378 {Opt_discard, EXT4_MOUNT_DISCARD, MOPT_SET},
1379 {Opt_nodiscard, EXT4_MOUNT_DISCARD, MOPT_CLEAR},
8dc0aa8c
TT		 1380 {Opt_delalloc, EXT4_MOUNT_DELALLOC,
1381 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
1382 {Opt_nodelalloc, EXT4_MOUNT_DELALLOC,
59d9fa5c 1383 MOPT_EXT4_ONLY | MOPT_CLEAR},
c6d3d56d
DW		 1384 {Opt_nojournal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
1385 MOPT_EXT4_ONLY | MOPT_CLEAR},
8dc0aa8c 1386 {Opt_journal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
1e381f60 1387 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
26092bf5 1388 {Opt_journal_async_commit, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT |
8dc0aa8c 1389 EXT4_MOUNT_JOURNAL_CHECKSUM),
1e381f60 1390 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
8dc0aa8c 1391 {Opt_noload, EXT4_MOUNT_NOLOAD, MOPT_NO_EXT2 | MOPT_SET},
26092bf5
TT		 1392 {Opt_err_panic, EXT4_MOUNT_ERRORS_PANIC, MOPT_SET | MOPT_CLEAR_ERR},
1393 {Opt_err_ro, EXT4_MOUNT_ERRORS_RO, MOPT_SET | MOPT_CLEAR_ERR},
1394 {Opt_err_cont, EXT4_MOUNT_ERRORS_CONT, MOPT_SET | MOPT_CLEAR_ERR},
8dc0aa8c
TT		 1395 {Opt_data_err_abort, EXT4_MOUNT_DATA_ERR_ABORT,
1396 MOPT_NO_EXT2 | MOPT_SET},
1397 {Opt_data_err_ignore, EXT4_MOUNT_DATA_ERR_ABORT,
1398 MOPT_NO_EXT2 | MOPT_CLEAR},
26092bf5
TT		 1399 {Opt_barrier, EXT4_MOUNT_BARRIER, MOPT_SET},
1400 {Opt_nobarrier, EXT4_MOUNT_BARRIER, MOPT_CLEAR},
1401 {Opt_noauto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_SET},
1402 {Opt_auto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_CLEAR},
1403 {Opt_noinit_itable, EXT4_MOUNT_INIT_INODE_TABLE, MOPT_CLEAR},
1404 {Opt_commit, 0, MOPT_GTE0},
1405 {Opt_max_batch_time, 0, MOPT_GTE0},
1406 {Opt_min_batch_time, 0, MOPT_GTE0},
1407 {Opt_inode_readahead_blks, 0, MOPT_GTE0},
1408 {Opt_init_itable, 0, MOPT_GTE0},
923ae0ff 1409 {Opt_dax, EXT4_MOUNT_DAX, MOPT_SET},
26092bf5 1410 {Opt_stripe, 0, MOPT_GTE0},
0efb3b23
JK		 1411 {Opt_resuid, 0, MOPT_GTE0},
1412 {Opt_resgid, 0, MOPT_GTE0},
5ba92bcf
CM		 1413 {Opt_journal_dev, 0, MOPT_NO_EXT2 | MOPT_GTE0},
1414 {Opt_journal_path, 0, MOPT_NO_EXT2 | MOPT_STRING},
1415 {Opt_journal_ioprio, 0, MOPT_NO_EXT2 | MOPT_GTE0},
8dc0aa8c
TT		 1416 {Opt_data_journal, EXT4_MOUNT_JOURNAL_DATA, MOPT_NO_EXT2 | MOPT_DATAJ},
1417 {Opt_data_ordered, EXT4_MOUNT_ORDERED_DATA, MOPT_NO_EXT2 | MOPT_DATAJ},
1418 {Opt_data_writeback, EXT4_MOUNT_WRITEBACK_DATA,
1419 MOPT_NO_EXT2 | MOPT_DATAJ},
26092bf5
TT		 1420 {Opt_user_xattr, EXT4_MOUNT_XATTR_USER, MOPT_SET},
1421 {Opt_nouser_xattr, EXT4_MOUNT_XATTR_USER, MOPT_CLEAR},
03010a33 1422#ifdef CONFIG_EXT4_FS_POSIX_ACL
26092bf5
TT		 1423 {Opt_acl, EXT4_MOUNT_POSIX_ACL, MOPT_SET},
1424 {Opt_noacl, EXT4_MOUNT_POSIX_ACL, MOPT_CLEAR},
ac27a0ec 1425#else
26092bf5
TT		 1426 {Opt_acl, 0, MOPT_NOSUPPORT},
1427 {Opt_noacl, 0, MOPT_NOSUPPORT},
ac27a0ec 1428#endif
26092bf5
TT		 1429 {Opt_nouid32, EXT4_MOUNT_NO_UID32, MOPT_SET},
1430 {Opt_debug, EXT4_MOUNT_DEBUG, MOPT_SET},
1431 {Opt_quota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA, MOPT_SET | MOPT_Q},
1432 {Opt_usrquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA,
1433 MOPT_SET | MOPT_Q},
1434 {Opt_grpquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_GRPQUOTA,
1435 MOPT_SET | MOPT_Q},
1436 {Opt_noquota, (EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA |
1437 EXT4_MOUNT_GRPQUOTA), MOPT_CLEAR | MOPT_Q},
1438 {Opt_usrjquota, 0, MOPT_Q},
1439 {Opt_grpjquota, 0, MOPT_Q},
1440 {Opt_offusrjquota, 0, MOPT_Q},
1441 {Opt_offgrpjquota, 0, MOPT_Q},
1442 {Opt_jqfmt_vfsold, QFMT_VFS_OLD, MOPT_QFMT},
1443 {Opt_jqfmt_vfsv0, QFMT_VFS_V0, MOPT_QFMT},
1444 {Opt_jqfmt_vfsv1, QFMT_VFS_V1, MOPT_QFMT},
df981d03 1445 {Opt_max_dir_size_kb, 0, MOPT_GTE0},
6ddb2447 1446 {Opt_test_dummy_encryption, 0, MOPT_GTE0},
26092bf5
TT		 1447 {Opt_err, 0, 0}
1448};
1449
1450static int handle_mount_opt(struct super_block *sb, char *opt, int token,
1451 substring_t *args, unsigned long *journal_devnum,
1452 unsigned int *journal_ioprio, int is_remount)
1453{
1454 struct ext4_sb_info *sbi = EXT4_SB(sb);
1455 const struct mount_opts *m;
08cefc7a
EB		 1456 kuid_t uid;
1457 kgid_t gid;
26092bf5
TT		 1458 int arg = 0;
1459
57f73c2c
TT		 1460#ifdef CONFIG_QUOTA
1461 if (token == Opt_usrjquota)
1462 return set_qf_name(sb, USRQUOTA, &args[0]);
1463 else if (token == Opt_grpjquota)
1464 return set_qf_name(sb, GRPQUOTA, &args[0]);
1465 else if (token == Opt_offusrjquota)
1466 return clear_qf_name(sb, USRQUOTA);
1467 else if (token == Opt_offgrpjquota)
1468 return clear_qf_name(sb, GRPQUOTA);
1469#endif
26092bf5 1470 switch (token) {
f7048605
TT		 1471 case Opt_noacl:
1472 case Opt_nouser_xattr:
1473 ext4_msg(sb, KERN_WARNING, deprecated_msg, opt, "3.5");
1474 break;
26092bf5
TT		 1475 case Opt_sb:
1476 return 1; /* handled by get_sb_block() */
1477 case Opt_removed:
5f3633e3 1478 ext4_msg(sb, KERN_WARNING, "Ignoring removed %s option", opt);
26092bf5 1479 return 1;
26092bf5
TT		 1480 case Opt_abort:
1481 sbi->s_mount_flags |= EXT4_MF_FS_ABORTED;
1482 return 1;
1483 case Opt_i_version:
1484 sb->s_flags |= MS_I_VERSION;
1485 return 1;
a26f4992
TT		 1486 case Opt_lazytime:
1487 sb->s_flags |= MS_LAZYTIME;
1488 return 1;
1489 case Opt_nolazytime:
1490 sb->s_flags &= ~MS_LAZYTIME;
1491 return 1;
26092bf5
TT		 1492 }
1493
5f3633e3
JK		 1494 for (m = ext4_mount_opts; m->token != Opt_err; m++)
1495 if (token == m->token)
1496 break;
1497
1498 if (m->token == Opt_err) {
1499 ext4_msg(sb, KERN_ERR, "Unrecognized mount option \"%s\" "
1500 "or missing value", opt);
1501 return -1;
1502 }
1503
8dc0aa8c
TT		 1504 if ((m->flags & MOPT_NO_EXT2) && IS_EXT2_SB(sb)) {
1505 ext4_msg(sb, KERN_ERR,
1506 "Mount option \"%s\" incompatible with ext2", opt);
1507 return -1;
1508 }
1509 if ((m->flags & MOPT_NO_EXT3) && IS_EXT3_SB(sb)) {
1510 ext4_msg(sb, KERN_ERR,
1511 "Mount option \"%s\" incompatible with ext3", opt);
1512 return -1;
1513 }
1514
ad4eec61 1515 if (args->from && !(m->flags & MOPT_STRING) && match_int(args, &arg))
5f3633e3
JK		 1516 return -1;
1517 if (args->from && (m->flags & MOPT_GTE0) && (arg < 0))
1518 return -1;
c93cf2d7
DM		 1519 if (m->flags & MOPT_EXPLICIT) {
1520 if (m->mount_opt & EXT4_MOUNT_DELALLOC) {
1521 set_opt2(sb, EXPLICIT_DELALLOC);
1e381f60
DM		 1522 } else if (m->mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) {
1523 set_opt2(sb, EXPLICIT_JOURNAL_CHECKSUM);
c93cf2d7
DM		 1524 } else
1525 return -1;
1526 }
5f3633e3
JK		 1527 if (m->flags & MOPT_CLEAR_ERR)
1528 clear_opt(sb, ERRORS_MASK);
1529 if (token == Opt_noquota && sb_any_quota_loaded(sb)) {
1530 ext4_msg(sb, KERN_ERR, "Cannot change quota "
1531 "options when quota turned on");
1532 return -1;
1533 }
1534
1535 if (m->flags & MOPT_NOSUPPORT) {
1536 ext4_msg(sb, KERN_ERR, "%s option not supported", opt);
1537 } else if (token == Opt_commit) {
1538 if (arg == 0)
1539 arg = JBD2_DEFAULT_MAX_COMMIT_AGE;
1540 sbi->s_commit_interval = HZ * arg;
1541 } else if (token == Opt_max_batch_time) {
5f3633e3
JK		 1542 sbi->s_max_batch_time = arg;
1543 } else if (token == Opt_min_batch_time) {
1544 sbi->s_min_batch_time = arg;
1545 } else if (token == Opt_inode_readahead_blks) {
e33e60ea
JK		 1546 if (arg && (arg > (1 << 30) || !is_power_of_2(arg))) {
1547 ext4_msg(sb, KERN_ERR,
1548 "EXT4-fs: inode_readahead_blks must be "
1549 "0 or a power of 2 smaller than 2^31");
26092bf5 1550 return -1;
5f3633e3
JK		 1551 }
1552 sbi->s_inode_readahead_blks = arg;
1553 } else if (token == Opt_init_itable) {
1554 set_opt(sb, INIT_INODE_TABLE);
1555 if (!args->from)
1556 arg = EXT4_DEF_LI_WAIT_MULT;
1557 sbi->s_li_wait_mult = arg;
1558 } else if (token == Opt_max_dir_size_kb) {
1559 sbi->s_max_dir_size_kb = arg;
1560 } else if (token == Opt_stripe) {
1561 sbi->s_stripe = arg;
1562 } else if (token == Opt_resuid) {
1563 uid = make_kuid(current_user_ns(), arg);
1564 if (!uid_valid(uid)) {
1565 ext4_msg(sb, KERN_ERR, "Invalid uid value %d", arg);
26092bf5
TT		 1566 return -1;
1567 }
5f3633e3
JK		 1568 sbi->s_resuid = uid;
1569 } else if (token == Opt_resgid) {
1570 gid = make_kgid(current_user_ns(), arg);
1571 if (!gid_valid(gid)) {
1572 ext4_msg(sb, KERN_ERR, "Invalid gid value %d", arg);
1573 return -1;
1574 }
1575 sbi->s_resgid = gid;
1576 } else if (token == Opt_journal_dev) {
1577 if (is_remount) {
1578 ext4_msg(sb, KERN_ERR,
1579 "Cannot specify journal on remount");
1580 return -1;
1581 }
1582 *journal_devnum = arg;
ad4eec61
ES		 1583 } else if (token == Opt_journal_path) {
1584 char *journal_path;
1585 struct inode *journal_inode;
1586 struct path path;
1587 int error;
1588
1589 if (is_remount) {
1590 ext4_msg(sb, KERN_ERR,
1591 "Cannot specify journal on remount");
1592 return -1;
1593 }
1594 journal_path = match_strdup(&args[0]);
1595 if (!journal_path) {
1596 ext4_msg(sb, KERN_ERR, "error: could not dup "
1597 "journal device string");
1598 return -1;
1599 }
1600
1601 error = kern_path(journal_path, LOOKUP_FOLLOW, &path);
1602 if (error) {
1603 ext4_msg(sb, KERN_ERR, "error: could not find "
1604 "journal device path: error %d", error);
1605 kfree(journal_path);
1606 return -1;
1607 }
1608
2b0143b5 1609 journal_inode = d_inode(path.dentry);
ad4eec61
ES		 1610 if (!S_ISBLK(journal_inode->i_mode)) {
1611 ext4_msg(sb, KERN_ERR, "error: journal path %s "
1612 "is not a block device", journal_path);
1613 path_put(&path);
1614 kfree(journal_path);
1615 return -1;
1616 }
1617
1618 *journal_devnum = new_encode_dev(journal_inode->i_rdev);
1619 path_put(&path);
1620 kfree(journal_path);
5f3633e3
JK		 1621 } else if (token == Opt_journal_ioprio) {
1622 if (arg > 7) {
1623 ext4_msg(sb, KERN_ERR, "Invalid journal IO priority"
1624 " (must be 0-7)");
1625 return -1;
1626 }
1627 *journal_ioprio =
1628 IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, arg);
6ddb2447
TT		 1629 } else if (token == Opt_test_dummy_encryption) {
1630#ifdef CONFIG_EXT4_FS_ENCRYPTION
1631 sbi->s_mount_flags |= EXT4_MF_TEST_DUMMY_ENCRYPTION;
1632 ext4_msg(sb, KERN_WARNING,
1633 "Test dummy encryption mode enabled");
1634#else
1635 ext4_msg(sb, KERN_WARNING,
1636 "Test dummy encryption mount option ignored");
1637#endif
5f3633e3
JK		 1638 } else if (m->flags & MOPT_DATAJ) {
1639 if (is_remount) {
1640 if (!sbi->s_journal)
1641 ext4_msg(sb, KERN_WARNING, "Remounting file system with no journal so ignoring journalled data option");
1642 else if (test_opt(sb, DATA_FLAGS) != m->mount_opt) {
0efb3b23 1643 ext4_msg(sb, KERN_ERR,
26092bf5 1644 "Cannot change data mode on remount");
26092bf5 1645 return -1;
ac27a0ec 1646 }
26092bf5 1647 } else {
5f3633e3
JK		 1648 clear_opt(sb, DATA_FLAGS);
1649 sbi->s_mount_opt |= m->mount_opt;
ac27a0ec 1650 }
5f3633e3
JK		 1651#ifdef CONFIG_QUOTA
1652 } else if (m->flags & MOPT_QFMT) {
1653 if (sb_any_quota_loaded(sb) &&
1654 sbi->s_jquota_fmt != m->mount_opt) {
1655 ext4_msg(sb, KERN_ERR, "Cannot change journaled "
1656 "quota options when quota turned on");
1657 return -1;
1658 }
e2b911c5 1659 if (ext4_has_feature_quota(sb)) {
262b4662
JK		 1660 ext4_msg(sb, KERN_ERR,
1661 "Cannot set journaled quota options "
1662 "when QUOTA feature is enabled");
1663 return -1;
1664 }
5f3633e3 1665 sbi->s_jquota_fmt = m->mount_opt;
923ae0ff
RZ		 1666#endif
1667#ifndef CONFIG_FS_DAX
1668 } else if (token == Opt_dax) {
1669 ext4_msg(sb, KERN_INFO, "dax option not supported");
1670 return -1;
5f3633e3
JK		 1671#endif
1672 } else {
1673 if (!args->from)
1674 arg = 1;
1675 if (m->flags & MOPT_CLEAR)
1676 arg = !arg;
1677 else if (unlikely(!(m->flags & MOPT_SET))) {
1678 ext4_msg(sb, KERN_WARNING,
1679 "buggy handling of option %s", opt);
1680 WARN_ON(1);
1681 return -1;
1682 }
1683 if (arg != 0)
1684 sbi->s_mount_opt |= m->mount_opt;
1685 else
1686 sbi->s_mount_opt &= ~m->mount_opt;
26092bf5 1687 }
5f3633e3 1688 return 1;
26092bf5
TT		 1689}
1690
1691static int parse_options(char *options, struct super_block *sb,
1692 unsigned long *journal_devnum,
1693 unsigned int *journal_ioprio,
1694 int is_remount)
1695{
1696 struct ext4_sb_info *sbi = EXT4_SB(sb);
1697 char *p;
1698 substring_t args[MAX_OPT_ARGS];
1699 int token;
1700
1701 if (!options)
1702 return 1;
1703
1704 while ((p = strsep(&options, ",")) != NULL) {
1705 if (!*p)
1706 continue;
1707 /*
1708 * Initialize args struct so we know whether arg was
1709 * found; some options take optional arguments.
1710 */
caecd0af 1711 args[0].to = args[0].from = NULL;
26092bf5
TT		 1712 token = match_token(p, tokens, args);
1713 if (handle_mount_opt(sb, p, token, args, journal_devnum,
1714 journal_ioprio, is_remount) < 0)
1715 return 0;
ac27a0ec
DK		 1716 }
1717#ifdef CONFIG_QUOTA
e2b911c5 1718 if (ext4_has_feature_quota(sb) &&
262b4662
JK		 1719 (test_opt(sb, USRQUOTA) || test_opt(sb, GRPQUOTA))) {
1720 ext4_msg(sb, KERN_ERR, "Cannot set quota options when QUOTA "
1721 "feature is enabled");
1722 return 0;
1723 }
ac27a0ec 1724 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
482a7425 1725 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
fd8c37ec 1726 clear_opt(sb, USRQUOTA);
ac27a0ec 1727
482a7425 1728 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
fd8c37ec 1729 clear_opt(sb, GRPQUOTA);
ac27a0ec 1730
56c50f11 1731 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
b31e1552
ES		 1732 ext4_msg(sb, KERN_ERR, "old and new quota "
1733 "format mixing");
ac27a0ec
DK		 1734 return 0;
1735 }
1736
1737 if (!sbi->s_jquota_fmt) {
b31e1552
ES		 1738 ext4_msg(sb, KERN_ERR, "journaled quota format "
1739 "not specified");
ac27a0ec
DK		 1740 return 0;
1741 }
ac27a0ec
DK		 1742 }
1743#endif
261cb20c
JK		 1744 if (test_opt(sb, DIOREAD_NOLOCK)) {
1745 int blocksize =
1746 BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);
1747
1748 if (blocksize < PAGE_CACHE_SIZE) {
1749 ext4_msg(sb, KERN_ERR, "can't mount with "
1750 "dioread_nolock if block size != PAGE_SIZE");
1751 return 0;
1752 }
1753 }
d4f76107
JK		 1754 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA &&
1755 test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
1756 ext4_msg(sb, KERN_ERR, "can't mount with journal_async_commit "
1757 "in data=ordered mode");
1758 return 0;
1759 }
ac27a0ec
DK		 1760 return 1;
1761}
1762
2adf6da8
TT		 1763static inline void ext4_show_quota_options(struct seq_file *seq,
1764 struct super_block *sb)
1765{
1766#if defined(CONFIG_QUOTA)
1767 struct ext4_sb_info *sbi = EXT4_SB(sb);
1768
1769 if (sbi->s_jquota_fmt) {
1770 char *fmtname = "";
1771
1772 switch (sbi->s_jquota_fmt) {
1773 case QFMT_VFS_OLD:
1774 fmtname = "vfsold";
1775 break;
1776 case QFMT_VFS_V0:
1777 fmtname = "vfsv0";
1778 break;
1779 case QFMT_VFS_V1:
1780 fmtname = "vfsv1";
1781 break;
1782 }
1783 seq_printf(seq, ",jqfmt=%s", fmtname);
1784 }
1785
1786 if (sbi->s_qf_names[USRQUOTA])
a068acf2 1787 seq_show_option(seq, "usrjquota", sbi->s_qf_names[USRQUOTA]);
2adf6da8
TT		 1788
1789 if (sbi->s_qf_names[GRPQUOTA])
a068acf2 1790 seq_show_option(seq, "grpjquota", sbi->s_qf_names[GRPQUOTA]);
2adf6da8
TT		 1791#endif
1792}
1793
5a916be1
TT		 1794static const char *token2str(int token)
1795{
50df9fd5 1796 const struct match_token *t;
5a916be1
TT		 1797
1798 for (t = tokens; t->token != Opt_err; t++)
1799 if (t->token == token && !strchr(t->pattern, '='))
1800 break;
1801 return t->pattern;
1802}
1803
2adf6da8
TT		 1804/*
1805 * Show an option if
1806 * - it's set to a non-default value OR
1807 * - if the per-sb default is different from the global default
1808 */
66acdcf4
TT		 1809static int _ext4_show_options(struct seq_file *seq, struct super_block *sb,
1810 int nodefs)
2adf6da8 1811{
2adf6da8
TT		 1812 struct ext4_sb_info *sbi = EXT4_SB(sb);
1813 struct ext4_super_block *es = sbi->s_es;
66acdcf4 1814 int def_errors, def_mount_opt = nodefs ? 0 : sbi->s_def_mount_opt;
5a916be1 1815 const struct mount_opts *m;
66acdcf4 1816 char sep = nodefs ? '\n' : ',';
2adf6da8 1817
66acdcf4
TT		 1818#define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep)
1819#define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg)
2adf6da8
TT		 1820
1821 if (sbi->s_sb_block != 1)
5a916be1
TT		 1822 SEQ_OPTS_PRINT("sb=%llu", sbi->s_sb_block);
1823
1824 for (m = ext4_mount_opts; m->token != Opt_err; m++) {
1825 int want_set = m->flags & MOPT_SET;
1826 if (((m->flags & (MOPT_SET|MOPT_CLEAR)) == 0) ||
1827 (m->flags & MOPT_CLEAR_ERR))
1828 continue;
66acdcf4 1829 if (!(m->mount_opt & (sbi->s_mount_opt ^ def_mount_opt)))
5a916be1
TT		 1830 continue; /* skip if same as the default */
1831 if ((want_set &&
1832 (sbi->s_mount_opt & m->mount_opt) != m->mount_opt) ||
1833 (!want_set && (sbi->s_mount_opt & m->mount_opt)))
1834 continue; /* select Opt_noFoo vs Opt_Foo */
1835 SEQ_OPTS_PRINT("%s", token2str(m->token));
2adf6da8 1836 }
5a916be1 1837
08cefc7a 1838 if (nodefs || !uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT4_DEF_RESUID)) ||
5a916be1 1839 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID)
08cefc7a
EB		 1840 SEQ_OPTS_PRINT("resuid=%u",
1841 from_kuid_munged(&init_user_ns, sbi->s_resuid));
1842 if (nodefs || !gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT4_DEF_RESGID)) ||
5a916be1 1843 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID)
08cefc7a
EB		 1844 SEQ_OPTS_PRINT("resgid=%u",
1845 from_kgid_munged(&init_user_ns, sbi->s_resgid));
66acdcf4 1846 def_errors = nodefs ? -1 : le16_to_cpu(es->s_errors);
5a916be1
TT		 1847 if (test_opt(sb, ERRORS_RO) && def_errors != EXT4_ERRORS_RO)
1848 SEQ_OPTS_PUTS("errors=remount-ro");
2adf6da8 1849 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
5a916be1 1850 SEQ_OPTS_PUTS("errors=continue");
2adf6da8 1851 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
5a916be1 1852 SEQ_OPTS_PUTS("errors=panic");
66acdcf4 1853 if (nodefs || sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ)
5a916be1 1854 SEQ_OPTS_PRINT("commit=%lu", sbi->s_commit_interval / HZ);
66acdcf4 1855 if (nodefs || sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME)
5a916be1 1856 SEQ_OPTS_PRINT("min_batch_time=%u", sbi->s_min_batch_time);
66acdcf4 1857 if (nodefs || sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME)
5a916be1 1858 SEQ_OPTS_PRINT("max_batch_time=%u", sbi->s_max_batch_time);
2adf6da8 1859 if (sb->s_flags & MS_I_VERSION)
5a916be1 1860 SEQ_OPTS_PUTS("i_version");
66acdcf4 1861 if (nodefs || sbi->s_stripe)
5a916be1 1862 SEQ_OPTS_PRINT("stripe=%lu", sbi->s_stripe);
66acdcf4 1863 if (EXT4_MOUNT_DATA_FLAGS & (sbi->s_mount_opt ^ def_mount_opt)) {
5a916be1
TT		 1864 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
1865 SEQ_OPTS_PUTS("data=journal");
1866 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
1867 SEQ_OPTS_PUTS("data=ordered");
1868 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
1869 SEQ_OPTS_PUTS("data=writeback");
1870 }
66acdcf4
TT		 1871 if (nodefs ||
1872 sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
5a916be1
TT		 1873 SEQ_OPTS_PRINT("inode_readahead_blks=%u",
1874 sbi->s_inode_readahead_blks);
2adf6da8 1875
66acdcf4
TT		 1876 if (nodefs || (test_opt(sb, INIT_INODE_TABLE) &&
1877 (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT)))
5a916be1 1878 SEQ_OPTS_PRINT("init_itable=%u", sbi->s_li_wait_mult);
df981d03
TT		 1879 if (nodefs || sbi->s_max_dir_size_kb)
1880 SEQ_OPTS_PRINT("max_dir_size_kb=%u", sbi->s_max_dir_size_kb);
2adf6da8
TT		 1881
1882 ext4_show_quota_options(seq, sb);
2adf6da8
TT		 1883 return 0;
1884}
1885
66acdcf4
TT		 1886static int ext4_show_options(struct seq_file *seq, struct dentry *root)
1887{
1888 return _ext4_show_options(seq, root->d_sb, 0);
1889}
1890
ebd173be 1891int ext4_seq_options_show(struct seq_file *seq, void *offset)
66acdcf4
TT		 1892{
1893 struct super_block *sb = seq->private;
1894 int rc;
1895
1896 seq_puts(seq, (sb->s_flags & MS_RDONLY) ? "ro" : "rw");
1897 rc = _ext4_show_options(seq, sb, 1);
1898 seq_puts(seq, "\n");
1899 return rc;
1900}
1901
617ba13b 1902static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
ac27a0ec
DK		 1903 int read_only)
1904{
617ba13b 1905 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec
DK		 1906 int res = 0;
1907
617ba13b 1908 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
b31e1552
ES		 1909 ext4_msg(sb, KERN_ERR, "revision level too high, "
1910 "forcing read-only mode");
ac27a0ec
DK		 1911 res = MS_RDONLY;
1912 }
1913 if (read_only)
281b5995 1914 goto done;
617ba13b 1915 if (!(sbi->s_mount_state & EXT4_VALID_FS))
b31e1552
ES		 1916 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
1917 "running e2fsck is recommended");
c8b459f4 1918 else if (sbi->s_mount_state & EXT4_ERROR_FS)
b31e1552
ES		 1919 ext4_msg(sb, KERN_WARNING,
1920 "warning: mounting fs with errors, "
1921 "running e2fsck is recommended");
ed3ce80a 1922 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
ac27a0ec
DK		 1923 le16_to_cpu(es->s_mnt_count) >=
1924 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
b31e1552
ES		 1925 ext4_msg(sb, KERN_WARNING,
1926 "warning: maximal mount count reached, "
1927 "running e2fsck is recommended");
ac27a0ec
DK		 1928 else if (le32_to_cpu(es->s_checkinterval) &&
1929 (le32_to_cpu(es->s_lastcheck) +
1930 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
b31e1552
ES		 1931 ext4_msg(sb, KERN_WARNING,
1932 "warning: checktime reached, "
1933 "running e2fsck is recommended");
0b8e58a1 1934 if (!sbi->s_journal)
0390131b 1935 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
ac27a0ec 1936 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
617ba13b 1937 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
e8546d06 1938 le16_add_cpu(&es->s_mnt_count, 1);
ac27a0ec 1939 es->s_mtime = cpu_to_le32(get_seconds());
617ba13b 1940 ext4_update_dynamic_rev(sb);
0390131b 1941 if (sbi->s_journal)
e2b911c5 1942 ext4_set_feature_journal_needs_recovery(sb);
ac27a0ec 1943
e2d67052 1944 ext4_commit_super(sb, 1);
281b5995 1945done:
ac27a0ec 1946 if (test_opt(sb, DEBUG))
a9df9a49 1947 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
a2595b8a 1948 "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
ac27a0ec
DK		 1949 sb->s_blocksize,
1950 sbi->s_groups_count,
617ba13b
MC		 1951 EXT4_BLOCKS_PER_GROUP(sb),
1952 EXT4_INODES_PER_GROUP(sb),
a2595b8a 1953 sbi->s_mount_opt, sbi->s_mount_opt2);
ac27a0ec 1954
7abc52c2 1955 cleancache_init_fs(sb);
ac27a0ec
DK		 1956 return res;
1957}
1958
117fff10
TT		 1959int ext4_alloc_flex_bg_array(struct super_block *sb, ext4_group_t ngroup)
1960{
1961 struct ext4_sb_info *sbi = EXT4_SB(sb);
1962 struct flex_groups *new_groups;
1963 int size;
1964
1965 if (!sbi->s_log_groups_per_flex)
1966 return 0;
1967
1968 size = ext4_flex_group(sbi, ngroup - 1) + 1;
1969 if (size <= sbi->s_flex_groups_allocated)
1970 return 0;
1971
1972 size = roundup_pow_of_two(size * sizeof(struct flex_groups));
1973 new_groups = ext4_kvzalloc(size, GFP_KERNEL);
1974 if (!new_groups) {
1975 ext4_msg(sb, KERN_ERR, "not enough memory for %d flex groups",
1976 size / (int) sizeof(struct flex_groups));
1977 return -ENOMEM;
1978 }
1979
1980 if (sbi->s_flex_groups) {
1981 memcpy(new_groups, sbi->s_flex_groups,
1982 (sbi->s_flex_groups_allocated *
1983 sizeof(struct flex_groups)));
b93b41d4 1984 kvfree(sbi->s_flex_groups);
117fff10
TT		 1985 }
1986 sbi->s_flex_groups = new_groups;
1987 sbi->s_flex_groups_allocated = size / sizeof(struct flex_groups);
1988 return 0;
1989}
1990
772cb7c8
JS		 1991static int ext4_fill_flex_info(struct super_block *sb)
1992{
1993 struct ext4_sb_info *sbi = EXT4_SB(sb);
1994 struct ext4_group_desc *gdp = NULL;
772cb7c8 1995 ext4_group_t flex_group;
117fff10 1996 int i, err;
772cb7c8 1997
503358ae 1998 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
d50f2ab6 1999 if (sbi->s_log_groups_per_flex < 1 || sbi->s_log_groups_per_flex > 31) {
772cb7c8
JS		 2000 sbi->s_log_groups_per_flex = 0;
2001 return 1;
2002 }
2003
117fff10
TT		 2004 err = ext4_alloc_flex_bg_array(sb, sbi->s_groups_count);
2005 if (err)
9933fc0a 2006 goto failed;
772cb7c8 2007
772cb7c8 2008 for (i = 0; i < sbi->s_groups_count; i++) {
88b6edd1 2009 gdp = ext4_get_group_desc(sb, i, NULL);
772cb7c8
JS		 2010
2011 flex_group = ext4_flex_group(sbi, i);
7ad9bb65
TT		 2012 atomic_add(ext4_free_inodes_count(sb, gdp),
2013 &sbi->s_flex_groups[flex_group].free_inodes);
90ba983f
TT		 2014 atomic64_add(ext4_free_group_clusters(sb, gdp),
2015 &sbi->s_flex_groups[flex_group].free_clusters);
7ad9bb65
TT		 2016 atomic_add(ext4_used_dirs_count(sb, gdp),
2017 &sbi->s_flex_groups[flex_group].used_dirs);
772cb7c8
JS		 2018 }
2019
2020 return 1;
2021failed:
2022 return 0;
2023}
2024
e2b911c5 2025static __le16 ext4_group_desc_csum(struct super_block *sb, __u32 block_group,
feb0ab32 2026 struct ext4_group_desc *gdp)
717d50e4 2027{
feb0ab32 2028 int offset;
717d50e4 2029 __u16 crc = 0;
feb0ab32 2030 __le32 le_group = cpu_to_le32(block_group);
e2b911c5 2031 struct ext4_sb_info *sbi = EXT4_SB(sb);
717d50e4 2032
9aa5d32b 2033 if (ext4_has_metadata_csum(sbi->s_sb)) {
feb0ab32 2034 /* Use new metadata_csum algorithm */
d6a77105 2035 __le16 save_csum;
feb0ab32
DW		 2036 __u32 csum32;
2037
d6a77105 2038 save_csum = gdp->bg_checksum;
feb0ab32
DW		 2039 gdp->bg_checksum = 0;
2040 csum32 = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&le_group,
2041 sizeof(le_group));
2042 csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp,
2043 sbi->s_desc_size);
d6a77105 2044 gdp->bg_checksum = save_csum;
feb0ab32
DW		 2045
2046 crc = csum32 & 0xFFFF;
2047 goto out;
717d50e4
AD		 2048 }
2049
feb0ab32 2050 /* old crc16 code */
e2b911c5 2051 if (!ext4_has_feature_gdt_csum(sb))
813d32f9
DW		 2052 return 0;
2053
feb0ab32
DW		 2054 offset = offsetof(struct ext4_group_desc, bg_checksum);
2055
2056 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
2057 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
2058 crc = crc16(crc, (__u8 *)gdp, offset);
2059 offset += sizeof(gdp->bg_checksum); /* skip checksum */
2060 /* for checksum of struct ext4_group_desc do the rest...*/
e2b911c5 2061 if (ext4_has_feature_64bit(sb) &&
feb0ab32
DW		 2062 offset < le16_to_cpu(sbi->s_es->s_desc_size))
2063 crc = crc16(crc, (__u8 *)gdp + offset,
2064 le16_to_cpu(sbi->s_es->s_desc_size) -
2065 offset);
2066
2067out:
717d50e4
AD		 2068 return cpu_to_le16(crc);
2069}
2070
feb0ab32 2071int ext4_group_desc_csum_verify(struct super_block *sb, __u32 block_group,
717d50e4
AD		 2072 struct ext4_group_desc *gdp)
2073{
feb0ab32 2074 if (ext4_has_group_desc_csum(sb) &&
e2b911c5 2075 (gdp->bg_checksum != ext4_group_desc_csum(sb, block_group, gdp)))
717d50e4
AD		 2076 return 0;
2077
2078 return 1;
2079}
2080
feb0ab32
DW		 2081void ext4_group_desc_csum_set(struct super_block *sb, __u32 block_group,
2082 struct ext4_group_desc *gdp)
2083{
2084 if (!ext4_has_group_desc_csum(sb))
2085 return;
e2b911c5 2086 gdp->bg_checksum = ext4_group_desc_csum(sb, block_group, gdp);
feb0ab32
DW		 2087}
2088
ac27a0ec 2089/* Called at mount-time, super-block is locked */
bfff6873
LC		 2090static int ext4_check_descriptors(struct super_block *sb,
2091 ext4_group_t *first_not_zeroed)
ac27a0ec 2092{
617ba13b
MC		 2093 struct ext4_sb_info *sbi = EXT4_SB(sb);
2094 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
2095 ext4_fsblk_t last_block;
bd81d8ee
LV		 2096 ext4_fsblk_t block_bitmap;
2097 ext4_fsblk_t inode_bitmap;
2098 ext4_fsblk_t inode_table;
ce421581 2099 int flexbg_flag = 0;
bfff6873 2100 ext4_group_t i, grp = sbi->s_groups_count;
ac27a0ec 2101
e2b911c5 2102 if (ext4_has_feature_flex_bg(sb))
ce421581
JS		 2103 flexbg_flag = 1;
2104
af5bc92d 2105 ext4_debug("Checking group descriptors");
ac27a0ec 2106
197cd65a
AM		 2107 for (i = 0; i < sbi->s_groups_count; i++) {
2108 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
2109
ce421581 2110 if (i == sbi->s_groups_count - 1 || flexbg_flag)
bd81d8ee 2111 last_block = ext4_blocks_count(sbi->s_es) - 1;
ac27a0ec
DK		 2112 else
2113 last_block = first_block +
617ba13b 2114 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
ac27a0ec 2115
bfff6873
LC		 2116 if ((grp == sbi->s_groups_count) &&
2117 !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2118 grp = i;
2119
8fadc143 2120 block_bitmap = ext4_block_bitmap(sb, gdp);
2b2d6d01 2121 if (block_bitmap < first_block || block_bitmap > last_block) {
b31e1552 2122 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2123 "Block bitmap for group %u not in group "
b31e1552 2124 "(block %llu)!", i, block_bitmap);
ac27a0ec
DK		 2125 return 0;
2126 }
8fadc143 2127 inode_bitmap = ext4_inode_bitmap(sb, gdp);
2b2d6d01 2128 if (inode_bitmap < first_block || inode_bitmap > last_block) {
b31e1552 2129 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2130 "Inode bitmap for group %u not in group "
b31e1552 2131 "(block %llu)!", i, inode_bitmap);
ac27a0ec
DK		 2132 return 0;
2133 }
8fadc143 2134 inode_table = ext4_inode_table(sb, gdp);
bd81d8ee 2135 if (inode_table < first_block ||
2b2d6d01 2136 inode_table + sbi->s_itb_per_group - 1 > last_block) {
b31e1552 2137 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2138 "Inode table for group %u not in group "
b31e1552 2139 "(block %llu)!", i, inode_table);
ac27a0ec
DK		 2140 return 0;
2141 }
955ce5f5 2142 ext4_lock_group(sb, i);
feb0ab32 2143 if (!ext4_group_desc_csum_verify(sb, i, gdp)) {
b31e1552
ES		 2144 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2145 "Checksum for group %u failed (%u!=%u)",
e2b911c5 2146 i, le16_to_cpu(ext4_group_desc_csum(sb, i,
b31e1552 2147 gdp)), le16_to_cpu(gdp->bg_checksum));
7ee1ec4c 2148 if (!(sb->s_flags & MS_RDONLY)) {
955ce5f5 2149 ext4_unlock_group(sb, i);
8a266467 2150 return 0;
7ee1ec4c 2151 }
717d50e4 2152 }
955ce5f5 2153 ext4_unlock_group(sb, i);
ce421581
JS		 2154 if (!flexbg_flag)
2155 first_block += EXT4_BLOCKS_PER_GROUP(sb);
ac27a0ec 2156 }
bfff6873
LC		 2157 if (NULL != first_not_zeroed)
2158 *first_not_zeroed = grp;
ac27a0ec
DK		 2159 return 1;
2160}
2161
617ba13b 2162/* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
ac27a0ec
DK		 2163 * the superblock) which were deleted from all directories, but held open by
2164 * a process at the time of a crash. We walk the list and try to delete these
2165 * inodes at recovery time (only with a read-write filesystem).
2166 *
2167 * In order to keep the orphan inode chain consistent during traversal (in
2168 * case of crash during recovery), we link each inode into the superblock
2169 * orphan list_head and handle it the same way as an inode deletion during
2170 * normal operation (which journals the operations for us).
2171 *
2172 * We only do an iget() and an iput() on each inode, which is very safe if we
2173 * accidentally point at an in-use or already deleted inode. The worst that
2174 * can happen in this case is that we get a "bit already cleared" message from
617ba13b 2175 * ext4_free_inode(). The only reason we would point at a wrong inode is if
ac27a0ec
DK		 2176 * e2fsck was run on this filesystem, and it must have already done the orphan
2177 * inode cleanup for us, so we can safely abort without any further action.
2178 */
2b2d6d01
TT		 2179static void ext4_orphan_cleanup(struct super_block *sb,
2180 struct ext4_super_block *es)
ac27a0ec
DK		 2181{
2182 unsigned int s_flags = sb->s_flags;
2183 int nr_orphans = 0, nr_truncates = 0;
2184#ifdef CONFIG_QUOTA
2185 int i;
2186#endif
2187 if (!es->s_last_orphan) {
2188 jbd_debug(4, "no orphan inodes to clean up\n");
2189 return;
2190 }
2191
a8f48a95 2192 if (bdev_read_only(sb->s_bdev)) {
b31e1552
ES		 2193 ext4_msg(sb, KERN_ERR, "write access "
2194 "unavailable, skipping orphan cleanup");
a8f48a95
ES		 2195 return;
2196 }
2197
d39195c3
AG		 2198 /* Check if feature set would not allow a r/w mount */
2199 if (!ext4_feature_set_ok(sb, 0)) {
2200 ext4_msg(sb, KERN_INFO, "Skipping orphan cleanup due to "
2201 "unknown ROCOMPAT features");
2202 return;
2203 }
2204
617ba13b 2205 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
c25f9bc6
ES		 2206 /* don't clear list on RO mount w/ errors */
2207 if (es->s_last_orphan && !(s_flags & MS_RDONLY)) {
84474976 2208 ext4_msg(sb, KERN_INFO, "Errors on filesystem, "
ac27a0ec 2209 "clearing orphan list.\n");
c25f9bc6
ES		 2210 es->s_last_orphan = 0;
2211 }
ac27a0ec
DK		 2212 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2213 return;
2214 }
2215
2216 if (s_flags & MS_RDONLY) {
b31e1552 2217 ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
ac27a0ec
DK		 2218 sb->s_flags &= ~MS_RDONLY;
2219 }
2220#ifdef CONFIG_QUOTA
2221 /* Needed for iput() to work correctly and not trash data */
2222 sb->s_flags |= MS_ACTIVE;
2223 /* Turn on quotas so that they are updated correctly */
a2d4a646 2224 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
617ba13b
MC		 2225 if (EXT4_SB(sb)->s_qf_names[i]) {
2226 int ret = ext4_quota_on_mount(sb, i);
ac27a0ec 2227 if (ret < 0)
b31e1552
ES		 2228 ext4_msg(sb, KERN_ERR,
2229 "Cannot turn on journaled "
2230 "quota: error %d", ret);
ac27a0ec
DK		 2231 }
2232 }
2233#endif
2234
2235 while (es->s_last_orphan) {
2236 struct inode *inode;
2237
97bd42b9
JB		 2238 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
2239 if (IS_ERR(inode)) {
ac27a0ec
DK		 2240 es->s_last_orphan = 0;
2241 break;
2242 }
2243
617ba13b 2244 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
871a2931 2245 dquot_initialize(inode);
ac27a0ec 2246 if (inode->i_nlink) {
566370a2
PT		 2247 if (test_opt(sb, DEBUG))
2248 ext4_msg(sb, KERN_DEBUG,
2249 "%s: truncating inode %lu to %lld bytes",
2250 __func__, inode->i_ino, inode->i_size);
e5f8eab8 2251 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
ac27a0ec 2252 inode->i_ino, inode->i_size);
721e3eba 2253 mutex_lock(&inode->i_mutex);
55f252c9 2254 truncate_inode_pages(inode->i_mapping, inode->i_size);
617ba13b 2255 ext4_truncate(inode);
721e3eba 2256 mutex_unlock(&inode->i_mutex);
ac27a0ec
DK		 2257 nr_truncates++;
2258 } else {
566370a2
PT		 2259 if (test_opt(sb, DEBUG))
2260 ext4_msg(sb, KERN_DEBUG,
2261 "%s: deleting unreferenced inode %lu",
2262 __func__, inode->i_ino);
ac27a0ec
DK		 2263 jbd_debug(2, "deleting unreferenced inode %lu\n",
2264 inode->i_ino);
2265 nr_orphans++;
2266 }
2267 iput(inode); /* The delete magic happens here! */
2268 }
2269
2b2d6d01 2270#define PLURAL(x) (x), ((x) == 1) ? "" : "s"
ac27a0ec
DK		 2271
2272 if (nr_orphans)
b31e1552
ES		 2273 ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
2274 PLURAL(nr_orphans));
ac27a0ec 2275 if (nr_truncates)
b31e1552
ES		 2276 ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
2277 PLURAL(nr_truncates));
ac27a0ec
DK		 2278#ifdef CONFIG_QUOTA
2279 /* Turn quotas off */
a2d4a646 2280 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
ac27a0ec 2281 if (sb_dqopt(sb)->files[i])
287a8095 2282 dquot_quota_off(sb, i);
ac27a0ec
DK		 2283 }
2284#endif
2285 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
2286}
0b8e58a1 2287
cd2291a4
ES		 2288/*
2289 * Maximal extent format file size.
2290 * Resulting logical blkno at s_maxbytes must fit in our on-disk
2291 * extent format containers, within a sector_t, and within i_blocks
2292 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
2293 * so that won't be a limiting factor.
2294 *
f17722f9
LC		 2295 * However there is other limiting factor. We do store extents in the form
2296 * of starting block and length, hence the resulting length of the extent
2297 * covering maximum file size must fit into on-disk format containers as
2298 * well. Given that length is always by 1 unit bigger than max unit (because
2299 * we count 0 as well) we have to lower the s_maxbytes by one fs block.
2300 *
cd2291a4
ES		 2301 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
2302 */
f287a1a5 2303static loff_t ext4_max_size(int blkbits, int has_huge_files)
cd2291a4
ES		 2304{
2305 loff_t res;
2306 loff_t upper_limit = MAX_LFS_FILESIZE;
2307
2308 /* small i_blocks in vfs inode? */
f287a1a5 2309 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
cd2291a4 2310 /*
90c699a9 2311 * CONFIG_LBDAF is not enabled implies the inode
cd2291a4
ES		 2312 * i_block represent total blocks in 512 bytes
2313 * 32 == size of vfs inode i_blocks * 8
2314 */
2315 upper_limit = (1LL << 32) - 1;
2316
2317 /* total blocks in file system block size */
2318 upper_limit >>= (blkbits - 9);
2319 upper_limit <<= blkbits;
2320 }
2321
f17722f9
LC		 2322 /*
2323 * 32-bit extent-start container, ee_block. We lower the maxbytes
2324 * by one fs block, so ee_len can cover the extent of maximum file
2325 * size
2326 */
2327 res = (1LL << 32) - 1;
cd2291a4 2328 res <<= blkbits;
cd2291a4
ES		 2329
2330 /* Sanity check against vm- & vfs- imposed limits */
2331 if (res > upper_limit)
2332 res = upper_limit;
2333
2334 return res;
2335}
ac27a0ec 2336
ac27a0ec 2337/*
cd2291a4 2338 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
0fc1b451
AK		 2339 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2340 * We need to be 1 filesystem block less than the 2^48 sector limit.
ac27a0ec 2341 */
f287a1a5 2342static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
ac27a0ec 2343{
617ba13b 2344 loff_t res = EXT4_NDIR_BLOCKS;
0fc1b451
AK		 2345 int meta_blocks;
2346 loff_t upper_limit;
0b8e58a1
AD		 2347 /* This is calculated to be the largest file size for a dense, block
2348 * mapped file such that the file's total number of 512-byte sectors,
2349 * including data and all indirect blocks, does not exceed (2^48 - 1).
2350 *
2351 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2352 * number of 512-byte sectors of the file.
0fc1b451
AK		 2353 */
2354
f287a1a5 2355 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
0fc1b451 2356 /*
90c699a9 2357 * !has_huge_files or CONFIG_LBDAF not enabled implies that
0b8e58a1
AD		 2358 * the inode i_block field represents total file blocks in
2359 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
0fc1b451
AK		 2360 */
2361 upper_limit = (1LL << 32) - 1;
2362
2363 /* total blocks in file system block size */
2364 upper_limit >>= (bits - 9);
2365
2366 } else {
8180a562
AK		 2367 /*
2368 * We use 48 bit ext4_inode i_blocks
2369 * With EXT4_HUGE_FILE_FL set the i_blocks
2370 * represent total number of blocks in
2371 * file system block size
2372 */
0fc1b451
AK		 2373 upper_limit = (1LL << 48) - 1;
2374
0fc1b451
AK		 2375 }
2376
2377 /* indirect blocks */
2378 meta_blocks = 1;
2379 /* double indirect blocks */
2380 meta_blocks += 1 + (1LL << (bits-2));
2381 /* tripple indirect blocks */
2382 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
2383
2384 upper_limit -= meta_blocks;
2385 upper_limit <<= bits;
ac27a0ec
DK		 2386
2387 res += 1LL << (bits-2);
2388 res += 1LL << (2*(bits-2));
2389 res += 1LL << (3*(bits-2));
2390 res <<= bits;
2391 if (res > upper_limit)
2392 res = upper_limit;
0fc1b451
AK		 2393
2394 if (res > MAX_LFS_FILESIZE)
2395 res = MAX_LFS_FILESIZE;
2396
ac27a0ec
DK		 2397 return res;
2398}
2399
617ba13b 2400static ext4_fsblk_t descriptor_loc(struct super_block *sb,
0b8e58a1 2401 ext4_fsblk_t logical_sb_block, int nr)
ac27a0ec 2402{
617ba13b 2403 struct ext4_sb_info *sbi = EXT4_SB(sb);
fd2d4291 2404 ext4_group_t bg, first_meta_bg;
ac27a0ec
DK		 2405 int has_super = 0;
2406
2407 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
2408
e2b911c5 2409 if (!ext4_has_feature_meta_bg(sb) || nr < first_meta_bg)
70bbb3e0 2410 return logical_sb_block + nr + 1;
ac27a0ec 2411 bg = sbi->s_desc_per_block * nr;
617ba13b 2412 if (ext4_bg_has_super(sb, bg))
ac27a0ec 2413 has_super = 1;
0b8e58a1 2414
bd63f6b0
DW		 2415 /*
2416 * If we have a meta_bg fs with 1k blocks, group 0's GDT is at
2417 * block 2, not 1. If s_first_data_block == 0 (bigalloc is enabled
2418 * on modern mke2fs or blksize > 1k on older mke2fs) then we must
2419 * compensate.
2420 */
2421 if (sb->s_blocksize == 1024 && nr == 0 &&
2422 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block) == 0)
2423 has_super++;
2424
617ba13b 2425 return (has_super + ext4_group_first_block_no(sb, bg));
ac27a0ec
DK		 2426}
2427
c9de560d
AT		 2428/**
2429 * ext4_get_stripe_size: Get the stripe size.
2430 * @sbi: In memory super block info
2431 *
2432 * If we have specified it via mount option, then
2433 * use the mount option value. If the value specified at mount time is
2434 * greater than the blocks per group use the super block value.
2435 * If the super block value is greater than blocks per group return 0.
2436 * Allocator needs it be less than blocks per group.
2437 *
2438 */
2439static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
2440{
2441 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
2442 unsigned long stripe_width =
2443 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
3eb08658 2444 int ret;
c9de560d
AT		 2445
2446 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
3eb08658
DE		 2447 ret = sbi->s_stripe;
2448 else if (stripe_width <= sbi->s_blocks_per_group)
2449 ret = stripe_width;
2450 else if (stride <= sbi->s_blocks_per_group)
2451 ret = stride;
2452 else
2453 ret = 0;
c9de560d 2454
3eb08658
DE		 2455 /*
2456 * If the stripe width is 1, this makes no sense and
2457 * we set it to 0 to turn off stripe handling code.
2458 */
2459 if (ret <= 1)
2460 ret = 0;
c9de560d 2461
3eb08658 2462 return ret;
c9de560d 2463}
ac27a0ec 2464
a13fb1a4
ES		 2465/*
2466 * Check whether this filesystem can be mounted based on
2467 * the features present and the RDONLY/RDWR mount requested.
2468 * Returns 1 if this filesystem can be mounted as requested,
2469 * 0 if it cannot be.
2470 */
2471static int ext4_feature_set_ok(struct super_block *sb, int readonly)
2472{
e2b911c5 2473 if (ext4_has_unknown_ext4_incompat_features(sb)) {
a13fb1a4
ES		 2474 ext4_msg(sb, KERN_ERR,
2475 "Couldn't mount because of "
2476 "unsupported optional features (%x)",
2477 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
2478 ~EXT4_FEATURE_INCOMPAT_SUPP));
2479 return 0;
2480 }
2481
2482 if (readonly)
2483 return 1;
2484
e2b911c5 2485 if (ext4_has_feature_readonly(sb)) {
2cb5cc8b
DW		 2486 ext4_msg(sb, KERN_INFO, "filesystem is read-only");
2487 sb->s_flags |= MS_RDONLY;
2488 return 1;
2489 }
2490
a13fb1a4 2491 /* Check that feature set is OK for a read-write mount */
e2b911c5 2492 if (ext4_has_unknown_ext4_ro_compat_features(sb)) {
a13fb1a4
ES		 2493 ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of "
2494 "unsupported optional features (%x)",
2495 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
2496 ~EXT4_FEATURE_RO_COMPAT_SUPP));
2497 return 0;
2498 }
2499 /*
2500 * Large file size enabled file system can only be mounted
2501 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
2502 */
e2b911c5 2503 if (ext4_has_feature_huge_file(sb)) {
a13fb1a4
ES		 2504 if (sizeof(blkcnt_t) < sizeof(u64)) {
2505 ext4_msg(sb, KERN_ERR, "Filesystem with huge files "
2506 "cannot be mounted RDWR without "
2507 "CONFIG_LBDAF");
2508 return 0;
2509 }
2510 }
e2b911c5 2511 if (ext4_has_feature_bigalloc(sb) && !ext4_has_feature_extents(sb)) {
bab08ab9
TT		 2512 ext4_msg(sb, KERN_ERR,
2513 "Can't support bigalloc feature without "
2514 "extents feature\n");
2515 return 0;
2516 }
7c319d32
AK		 2517
2518#ifndef CONFIG_QUOTA
e2b911c5 2519 if (ext4_has_feature_quota(sb) && !readonly) {
7c319d32
AK		 2520 ext4_msg(sb, KERN_ERR,
2521 "Filesystem with quota feature cannot be mounted RDWR "
2522 "without CONFIG_QUOTA");
2523 return 0;
2524 }
2525#endif /* CONFIG_QUOTA */
a13fb1a4
ES		 2526 return 1;
2527}
2528
66e61a9e
TT		 2529/*
2530 * This function is called once a day if we have errors logged
2531 * on the file system
2532 */
2533static void print_daily_error_info(unsigned long arg)
2534{
2535 struct super_block *sb = (struct super_block *) arg;
2536 struct ext4_sb_info *sbi;
2537 struct ext4_super_block *es;
2538
2539 sbi = EXT4_SB(sb);
2540 es = sbi->s_es;
2541
2542 if (es->s_error_count)
ae0f78de
TT		 2543 /* fsck newer than v1.41.13 is needed to clean this condition. */
2544 ext4_msg(sb, KERN_NOTICE, "error count since last fsck: %u",
66e61a9e
TT		 2545 le32_to_cpu(es->s_error_count));
2546 if (es->s_first_error_time) {
ae0f78de 2547 printk(KERN_NOTICE "EXT4-fs (%s): initial error at time %u: %.*s:%d",
66e61a9e
TT		 2548 sb->s_id, le32_to_cpu(es->s_first_error_time),
2549 (int) sizeof(es->s_first_error_func),
2550 es->s_first_error_func,
2551 le32_to_cpu(es->s_first_error_line));
2552 if (es->s_first_error_ino)
2553 printk(": inode %u",
2554 le32_to_cpu(es->s_first_error_ino));
2555 if (es->s_first_error_block)
2556 printk(": block %llu", (unsigned long long)
2557 le64_to_cpu(es->s_first_error_block));
2558 printk("\n");
2559 }
2560 if (es->s_last_error_time) {
ae0f78de 2561 printk(KERN_NOTICE "EXT4-fs (%s): last error at time %u: %.*s:%d",
66e61a9e
TT		 2562 sb->s_id, le32_to_cpu(es->s_last_error_time),
2563 (int) sizeof(es->s_last_error_func),
2564 es->s_last_error_func,
2565 le32_to_cpu(es->s_last_error_line));
2566 if (es->s_last_error_ino)
2567 printk(": inode %u",
2568 le32_to_cpu(es->s_last_error_ino));
2569 if (es->s_last_error_block)
2570 printk(": block %llu", (unsigned long long)
2571 le64_to_cpu(es->s_last_error_block));
2572 printk("\n");
2573 }
2574 mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ); /* Once a day */
2575}
2576
bfff6873
LC		 2577/* Find next suitable group and run ext4_init_inode_table */
2578static int ext4_run_li_request(struct ext4_li_request *elr)
2579{
2580 struct ext4_group_desc *gdp = NULL;
2581 ext4_group_t group, ngroups;
2582 struct super_block *sb;
2583 unsigned long timeout = 0;
2584 int ret = 0;
2585
2586 sb = elr->lr_super;
2587 ngroups = EXT4_SB(sb)->s_groups_count;
2588
8e8ad8a5 2589 sb_start_write(sb);
bfff6873
LC		 2590 for (group = elr->lr_next_group; group < ngroups; group++) {
2591 gdp = ext4_get_group_desc(sb, group, NULL);
2592 if (!gdp) {
2593 ret = 1;
2594 break;
2595 }
2596
2597 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2598 break;
2599 }
2600
7f511862 2601 if (group >= ngroups)
bfff6873
LC		 2602 ret = 1;
2603
2604 if (!ret) {
2605 timeout = jiffies;
2606 ret = ext4_init_inode_table(sb, group,
2607 elr->lr_timeout ? 0 : 1);
2608 if (elr->lr_timeout == 0) {
51ce6511
LC		 2609 timeout = (jiffies - timeout) *
2610 elr->lr_sbi->s_li_wait_mult;
bfff6873
LC		 2611 elr->lr_timeout = timeout;
2612 }
2613 elr->lr_next_sched = jiffies + elr->lr_timeout;
2614 elr->lr_next_group = group + 1;
2615 }
8e8ad8a5 2616 sb_end_write(sb);
bfff6873
LC		 2617
2618 return ret;
2619}
2620
2621/*
2622 * Remove lr_request from the list_request and free the
4ed5c033 2623 * request structure. Should be called with li_list_mtx held
bfff6873
LC		 2624 */
2625static void ext4_remove_li_request(struct ext4_li_request *elr)
2626{
2627 struct ext4_sb_info *sbi;
2628
2629 if (!elr)
2630 return;
2631
2632 sbi = elr->lr_sbi;
2633
2634 list_del(&elr->lr_request);
2635 sbi->s_li_request = NULL;
2636 kfree(elr);
2637}
2638
2639static void ext4_unregister_li_request(struct super_block *sb)
2640{
1bb933fb
LC		 2641 mutex_lock(&ext4_li_mtx);
2642 if (!ext4_li_info) {
2643 mutex_unlock(&ext4_li_mtx);
bfff6873 2644 return;
1bb933fb 2645 }
bfff6873
LC		 2646
2647 mutex_lock(&ext4_li_info->li_list_mtx);
1bb933fb 2648 ext4_remove_li_request(EXT4_SB(sb)->s_li_request);
bfff6873 2649 mutex_unlock(&ext4_li_info->li_list_mtx);
1bb933fb 2650 mutex_unlock(&ext4_li_mtx);
bfff6873
LC		 2651}
2652
8f1f7453
ES		 2653static struct task_struct *ext4_lazyinit_task;
2654
bfff6873
LC		 2655/*
2656 * This is the function where ext4lazyinit thread lives. It walks
2657 * through the request list searching for next scheduled filesystem.
2658 * When such a fs is found, run the lazy initialization request
2659 * (ext4_rn_li_request) and keep track of the time spend in this
2660 * function. Based on that time we compute next schedule time of
2661 * the request. When walking through the list is complete, compute
2662 * next waking time and put itself into sleep.
2663 */
2664static int ext4_lazyinit_thread(void *arg)
2665{
2666 struct ext4_lazy_init *eli = (struct ext4_lazy_init *)arg;
2667 struct list_head *pos, *n;
2668 struct ext4_li_request *elr;
4ed5c033 2669 unsigned long next_wakeup, cur;
bfff6873
LC		 2670
2671 BUG_ON(NULL == eli);
2672
bfff6873
LC		 2673cont_thread:
2674 while (true) {
2675 next_wakeup = MAX_JIFFY_OFFSET;
2676
2677 mutex_lock(&eli->li_list_mtx);
2678 if (list_empty(&eli->li_request_list)) {
2679 mutex_unlock(&eli->li_list_mtx);
2680 goto exit_thread;
2681 }
2682
2683 list_for_each_safe(pos, n, &eli->li_request_list) {
2684 elr = list_entry(pos, struct ext4_li_request,
2685 lr_request);
2686
b2c78cd0
TT		 2687 if (time_after_eq(jiffies, elr->lr_next_sched)) {
2688 if (ext4_run_li_request(elr) != 0) {
2689 /* error, remove the lazy_init job */
2690 ext4_remove_li_request(elr);
2691 continue;
2692 }
bfff6873
LC		 2693 }
2694
2695 if (time_before(elr->lr_next_sched, next_wakeup))
2696 next_wakeup = elr->lr_next_sched;
2697 }
2698 mutex_unlock(&eli->li_list_mtx);
2699
a0acae0e 2700 try_to_freeze();
bfff6873 2701
4ed5c033
LC		 2702 cur = jiffies;
2703 if ((time_after_eq(cur, next_wakeup)) ||
f4245bd4 2704 (MAX_JIFFY_OFFSET == next_wakeup)) {
bfff6873
LC		 2705 cond_resched();
2706 continue;
2707 }
2708
4ed5c033
LC		 2709 schedule_timeout_interruptible(next_wakeup - cur);
2710
8f1f7453
ES		 2711 if (kthread_should_stop()) {
2712 ext4_clear_request_list();
2713 goto exit_thread;
2714 }
bfff6873
LC		 2715 }
2716
2717exit_thread:
2718 /*
2719 * It looks like the request list is empty, but we need
2720 * to check it under the li_list_mtx lock, to prevent any
2721 * additions into it, and of course we should lock ext4_li_mtx
2722 * to atomically free the list and ext4_li_info, because at
2723 * this point another ext4 filesystem could be registering
2724 * new one.
2725 */
2726 mutex_lock(&ext4_li_mtx);
2727 mutex_lock(&eli->li_list_mtx);
2728 if (!list_empty(&eli->li_request_list)) {
2729 mutex_unlock(&eli->li_list_mtx);
2730 mutex_unlock(&ext4_li_mtx);
2731 goto cont_thread;
2732 }
2733 mutex_unlock(&eli->li_list_mtx);
bfff6873
LC		 2734 kfree(ext4_li_info);
2735 ext4_li_info = NULL;
2736 mutex_unlock(&ext4_li_mtx);
2737
2738 return 0;
2739}
2740
2741static void ext4_clear_request_list(void)
2742{
2743 struct list_head *pos, *n;
2744 struct ext4_li_request *elr;
2745
2746 mutex_lock(&ext4_li_info->li_list_mtx);
bfff6873
LC		 2747 list_for_each_safe(pos, n, &ext4_li_info->li_request_list) {
2748 elr = list_entry(pos, struct ext4_li_request,
2749 lr_request);
2750 ext4_remove_li_request(elr);
2751 }
2752 mutex_unlock(&ext4_li_info->li_list_mtx);
2753}
2754
2755static int ext4_run_lazyinit_thread(void)
2756{
8f1f7453
ES		 2757 ext4_lazyinit_task = kthread_run(ext4_lazyinit_thread,
2758 ext4_li_info, "ext4lazyinit");
2759 if (IS_ERR(ext4_lazyinit_task)) {
2760 int err = PTR_ERR(ext4_lazyinit_task);
bfff6873 2761 ext4_clear_request_list();
bfff6873
LC		 2762 kfree(ext4_li_info);
2763 ext4_li_info = NULL;
92b97816 2764 printk(KERN_CRIT "EXT4-fs: error %d creating inode table "
bfff6873
LC		 2765 "initialization thread\n",
2766 err);
2767 return err;
2768 }
2769 ext4_li_info->li_state |= EXT4_LAZYINIT_RUNNING;
bfff6873
LC		 2770 return 0;
2771}
2772
2773/*
2774 * Check whether it make sense to run itable init. thread or not.
2775 * If there is at least one uninitialized inode table, return
2776 * corresponding group number, else the loop goes through all
2777 * groups and return total number of groups.
2778 */
2779static ext4_group_t ext4_has_uninit_itable(struct super_block *sb)
2780{
2781 ext4_group_t group, ngroups = EXT4_SB(sb)->s_groups_count;
2782 struct ext4_group_desc *gdp = NULL;
2783
2784 for (group = 0; group < ngroups; group++) {
2785 gdp = ext4_get_group_desc(sb, group, NULL);
2786 if (!gdp)
2787 continue;
2788
2789 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2790 break;
2791 }
2792
2793 return group;
2794}
2795
2796static int ext4_li_info_new(void)
2797{
2798 struct ext4_lazy_init *eli = NULL;
2799
2800 eli = kzalloc(sizeof(*eli), GFP_KERNEL);
2801 if (!eli)
2802 return -ENOMEM;
2803
bfff6873
LC		 2804 INIT_LIST_HEAD(&eli->li_request_list);
2805 mutex_init(&eli->li_list_mtx);
2806
bfff6873
LC		 2807 eli->li_state |= EXT4_LAZYINIT_QUIT;
2808
2809 ext4_li_info = eli;
2810
2811 return 0;
2812}
2813
2814static struct ext4_li_request *ext4_li_request_new(struct super_block *sb,
2815 ext4_group_t start)
2816{
2817 struct ext4_sb_info *sbi = EXT4_SB(sb);
2818 struct ext4_li_request *elr;
bfff6873
LC		 2819
2820 elr = kzalloc(sizeof(*elr), GFP_KERNEL);
2821 if (!elr)
2822 return NULL;
2823
2824 elr->lr_super = sb;
2825 elr->lr_sbi = sbi;
2826 elr->lr_next_group = start;
2827
2828 /*
2829 * Randomize first schedule time of the request to
2830 * spread the inode table initialization requests
2831 * better.
2832 */
dd1f723b
TT		 2833 elr->lr_next_sched = jiffies + (prandom_u32() %
2834 (EXT4_DEF_LI_MAX_START_DELAY * HZ));
bfff6873
LC		 2835 return elr;
2836}
2837
7f511862
TT		 2838int ext4_register_li_request(struct super_block *sb,
2839 ext4_group_t first_not_zeroed)
bfff6873
LC		 2840{
2841 struct ext4_sb_info *sbi = EXT4_SB(sb);
7f511862 2842 struct ext4_li_request *elr = NULL;
bfff6873 2843 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
6c5a6cb9 2844 int ret = 0;
bfff6873 2845
7f511862 2846 mutex_lock(&ext4_li_mtx);
51ce6511
LC		 2847 if (sbi->s_li_request != NULL) {
2848 /*
2849 * Reset timeout so it can be computed again, because
2850 * s_li_wait_mult might have changed.
2851 */
2852 sbi->s_li_request->lr_timeout = 0;
7f511862 2853 goto out;
51ce6511 2854 }
bfff6873
LC		 2855
2856 if (first_not_zeroed == ngroups ||
2857 (sb->s_flags & MS_RDONLY) ||
55ff3840 2858 !test_opt(sb, INIT_INODE_TABLE))
7f511862 2859 goto out;
bfff6873
LC		 2860
2861 elr = ext4_li_request_new(sb, first_not_zeroed);
7f511862
TT		 2862 if (!elr) {
2863 ret = -ENOMEM;
2864 goto out;
2865 }
bfff6873
LC		 2866
2867 if (NULL == ext4_li_info) {
2868 ret = ext4_li_info_new();
2869 if (ret)
2870 goto out;
2871 }
2872
2873 mutex_lock(&ext4_li_info->li_list_mtx);
2874 list_add(&elr->lr_request, &ext4_li_info->li_request_list);
2875 mutex_unlock(&ext4_li_info->li_list_mtx);
2876
2877 sbi->s_li_request = elr;
46e4690b
TM		 2878 /*
2879 * set elr to NULL here since it has been inserted to
2880 * the request_list and the removal and free of it is
2881 * handled by ext4_clear_request_list from now on.
2882 */
2883 elr = NULL;
bfff6873
LC		 2884
2885 if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) {
2886 ret = ext4_run_lazyinit_thread();
2887 if (ret)
2888 goto out;
2889 }
bfff6873 2890out:
beed5ecb
NK		 2891 mutex_unlock(&ext4_li_mtx);
2892 if (ret)
bfff6873 2893 kfree(elr);
bfff6873
LC		 2894 return ret;
2895}
2896
2897/*
2898 * We do not need to lock anything since this is called on
2899 * module unload.
2900 */
2901static void ext4_destroy_lazyinit_thread(void)
2902{
2903 /*
2904 * If thread exited earlier
2905 * there's nothing to be done.
2906 */
8f1f7453 2907 if (!ext4_li_info || !ext4_lazyinit_task)
bfff6873
LC		 2908 return;
2909
8f1f7453 2910 kthread_stop(ext4_lazyinit_task);
bfff6873
LC		 2911}
2912
25ed6e8a
DW		 2913static int set_journal_csum_feature_set(struct super_block *sb)
2914{
2915 int ret = 1;
2916 int compat, incompat;
2917 struct ext4_sb_info *sbi = EXT4_SB(sb);
2918
9aa5d32b 2919 if (ext4_has_metadata_csum(sb)) {
db9ee220 2920 /* journal checksum v3 */
25ed6e8a 2921 compat = 0;
db9ee220 2922 incompat = JBD2_FEATURE_INCOMPAT_CSUM_V3;
25ed6e8a
DW		 2923 } else {
2924 /* journal checksum v1 */
2925 compat = JBD2_FEATURE_COMPAT_CHECKSUM;
2926 incompat = 0;
2927 }
2928
feb8c6d3
DW		 2929 jbd2_journal_clear_features(sbi->s_journal,
2930 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
2931 JBD2_FEATURE_INCOMPAT_CSUM_V3 |
2932 JBD2_FEATURE_INCOMPAT_CSUM_V2);
25ed6e8a
DW		 2933 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
2934 ret = jbd2_journal_set_features(sbi->s_journal,
2935 compat, 0,
2936 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT |
2937 incompat);
2938 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
2939 ret = jbd2_journal_set_features(sbi->s_journal,
2940 compat, 0,
2941 incompat);
2942 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
2943 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2944 } else {
feb8c6d3
DW		 2945 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
2946 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
25ed6e8a
DW		 2947 }
2948
2949 return ret;
2950}
2951
952fc18e
TT		 2952/*
2953 * Note: calculating the overhead so we can be compatible with
2954 * historical BSD practice is quite difficult in the face of
2955 * clusters/bigalloc. This is because multiple metadata blocks from
2956 * different block group can end up in the same allocation cluster.
2957 * Calculating the exact overhead in the face of clustered allocation
2958 * requires either O(all block bitmaps) in memory or O(number of block
2959 * groups**2) in time. We will still calculate the superblock for
2960 * older file systems --- and if we come across with a bigalloc file
2961 * system with zero in s_overhead_clusters the estimate will be close to
2962 * correct especially for very large cluster sizes --- but for newer
2963 * file systems, it's better to calculate this figure once at mkfs
2964 * time, and store it in the superblock. If the superblock value is
2965 * present (even for non-bigalloc file systems), we will use it.
2966 */
2967static int count_overhead(struct super_block *sb, ext4_group_t grp,
2968 char *buf)
2969{
2970 struct ext4_sb_info *sbi = EXT4_SB(sb);
2971 struct ext4_group_desc *gdp;
2972 ext4_fsblk_t first_block, last_block, b;
2973 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
2974 int s, j, count = 0;
2975
e2b911c5 2976 if (!ext4_has_feature_bigalloc(sb))
0548bbb8
TT		 2977 return (ext4_bg_has_super(sb, grp) + ext4_bg_num_gdb(sb, grp) +
2978 sbi->s_itb_per_group + 2);
2979
952fc18e
TT		 2980 first_block = le32_to_cpu(sbi->s_es->s_first_data_block) +
2981 (grp * EXT4_BLOCKS_PER_GROUP(sb));
2982 last_block = first_block + EXT4_BLOCKS_PER_GROUP(sb) - 1;
2983 for (i = 0; i < ngroups; i++) {
2984 gdp = ext4_get_group_desc(sb, i, NULL);
2985 b = ext4_block_bitmap(sb, gdp);
2986 if (b >= first_block && b <= last_block) {
2987 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
2988 count++;
2989 }
2990 b = ext4_inode_bitmap(sb, gdp);
2991 if (b >= first_block && b <= last_block) {
2992 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
2993 count++;
2994 }
2995 b = ext4_inode_table(sb, gdp);
2996 if (b >= first_block && b + sbi->s_itb_per_group <= last_block)
2997 for (j = 0; j < sbi->s_itb_per_group; j++, b++) {
2998 int c = EXT4_B2C(sbi, b - first_block);
2999 ext4_set_bit(c, buf);
3000 count++;
3001 }
3002 if (i != grp)
3003 continue;
3004 s = 0;
3005 if (ext4_bg_has_super(sb, grp)) {
3006 ext4_set_bit(s++, buf);
3007 count++;
3008 }
3009 for (j = ext4_bg_num_gdb(sb, grp); j > 0; j--) {
3010 ext4_set_bit(EXT4_B2C(sbi, s++), buf);
3011 count++;
3012 }
3013 }
3014 if (!count)
3015 return 0;
3016 return EXT4_CLUSTERS_PER_GROUP(sb) -
3017 ext4_count_free(buf, EXT4_CLUSTERS_PER_GROUP(sb) / 8);
3018}
3019
3020/*
3021 * Compute the overhead and stash it in sbi->s_overhead
3022 */
3023int ext4_calculate_overhead(struct super_block *sb)
3024{
3025 struct ext4_sb_info *sbi = EXT4_SB(sb);
3026 struct ext4_super_block *es = sbi->s_es;
3027 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3028 ext4_fsblk_t overhead = 0;
4fdb5543 3029 char *buf = (char *) get_zeroed_page(GFP_NOFS);
952fc18e 3030
952fc18e
TT		 3031 if (!buf)
3032 return -ENOMEM;
3033
3034 /*
3035 * Compute the overhead (FS structures). This is constant
3036 * for a given filesystem unless the number of block groups
3037 * changes so we cache the previous value until it does.
3038 */
3039
3040 /*
3041 * All of the blocks before first_data_block are overhead
3042 */
3043 overhead = EXT4_B2C(sbi, le32_to_cpu(es->s_first_data_block));
3044
3045 /*
3046 * Add the overhead found in each block group
3047 */
3048 for (i = 0; i < ngroups; i++) {
3049 int blks;
3050
3051 blks = count_overhead(sb, i, buf);
3052 overhead += blks;
3053 if (blks)
3054 memset(buf, 0, PAGE_SIZE);
3055 cond_resched();
3056 }
b003b524
ES		 3057 /* Add the internal journal blocks as well */
3058 if (sbi->s_journal && !sbi->journal_bdev)
810da240 3059 overhead += EXT4_NUM_B2C(sbi, sbi->s_journal->j_maxlen);
0875a2b4 3060
952fc18e
TT		 3061 sbi->s_overhead = overhead;
3062 smp_wmb();
3063 free_page((unsigned long) buf);
3064 return 0;
3065}
3066
b5799018 3067static void ext4_set_resv_clusters(struct super_block *sb)
27dd4385
LC		 3068{
3069 ext4_fsblk_t resv_clusters;
b5799018 3070 struct ext4_sb_info *sbi = EXT4_SB(sb);
27dd4385 3071
30fac0f7
JK		 3072 /*
3073 * There's no need to reserve anything when we aren't using extents.
3074 * The space estimates are exact, there are no unwritten extents,
3075 * hole punching doesn't need new metadata... This is needed especially
3076 * to keep ext2/3 backward compatibility.
3077 */
e2b911c5 3078 if (!ext4_has_feature_extents(sb))
b5799018 3079 return;
27dd4385
LC		 3080 /*
3081 * By default we reserve 2% or 4096 clusters, whichever is smaller.
3082 * This should cover the situations where we can not afford to run
3083 * out of space like for example punch hole, or converting
556615dc 3084 * unwritten extents in delalloc path. In most cases such
27dd4385
LC		 3085 * allocation would require 1, or 2 blocks, higher numbers are
3086 * very rare.
3087 */
b5799018
TT		 3088 resv_clusters = (ext4_blocks_count(sbi->s_es) >>
3089 sbi->s_cluster_bits);
27dd4385
LC		 3090
3091 do_div(resv_clusters, 50);
3092 resv_clusters = min_t(ext4_fsblk_t, resv_clusters, 4096);
3093
b5799018 3094 atomic64_set(&sbi->s_resv_clusters, resv_clusters);
27dd4385
LC		 3095}
3096
2b2d6d01 3097static int ext4_fill_super(struct super_block *sb, void *data, int silent)
ac27a0ec 3098{
d4c402d9 3099 char *orig_data = kstrdup(data, GFP_KERNEL);
2b2d6d01 3100 struct buffer_head *bh;
617ba13b
MC		 3101 struct ext4_super_block *es = NULL;
3102 struct ext4_sb_info *sbi;
3103 ext4_fsblk_t block;
3104 ext4_fsblk_t sb_block = get_sb_block(&data);
70bbb3e0 3105 ext4_fsblk_t logical_sb_block;
ac27a0ec 3106 unsigned long offset = 0;
ac27a0ec
DK		 3107 unsigned long journal_devnum = 0;
3108 unsigned long def_mount_opts;
3109 struct inode *root;
0390131b 3110 const char *descr;
dcc7dae3 3111 int ret = -ENOMEM;
281b5995 3112 int blocksize, clustersize;
4ec11028
TT		 3113 unsigned int db_count;
3114 unsigned int i;
281b5995 3115 int needs_recovery, has_huge_files, has_bigalloc;
bd81d8ee 3116 __u64 blocks_count;
07aa2ea1 3117 int err = 0;
b3881f74 3118 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
bfff6873 3119 ext4_group_t first_not_zeroed;
ac27a0ec
DK		 3120
3121 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
3122 if (!sbi)
dcc7dae3 3123 goto out_free_orig;
705895b6
PE		 3124
3125 sbi->s_blockgroup_lock =
3126 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
3127 if (!sbi->s_blockgroup_lock) {
3128 kfree(sbi);
dcc7dae3 3129 goto out_free_orig;
705895b6 3130 }
ac27a0ec 3131 sb->s_fs_info = sbi;
2c0544b2 3132 sbi->s_sb = sb;
240799cd 3133 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
d9c9bef1 3134 sbi->s_sb_block = sb_block;
f613dfcb
TT		 3135 if (sb->s_bdev->bd_part)
3136 sbi->s_sectors_written_start =
3137 part_stat_read(sb->s_bdev->bd_part, sectors[1]);
ac27a0ec 3138
9f6200bb 3139 /* Cleanup superblock name */
ec3904dc 3140 strreplace(sb->s_id, '/', '!');
9f6200bb 3141
07aa2ea1 3142 /* -EINVAL is default */
dcc7dae3 3143 ret = -EINVAL;
617ba13b 3144 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
ac27a0ec 3145 if (!blocksize) {
b31e1552 3146 ext4_msg(sb, KERN_ERR, "unable to set blocksize");
ac27a0ec
DK		 3147 goto out_fail;
3148 }
3149
3150 /*
617ba13b 3151 * The ext4 superblock will not be buffer aligned for other than 1kB
ac27a0ec
DK		 3152 * block sizes. We need to calculate the offset from buffer start.
3153 */
617ba13b 3154 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
70bbb3e0
AM		 3155 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3156 offset = do_div(logical_sb_block, blocksize);
ac27a0ec 3157 } else {
70bbb3e0 3158 logical_sb_block = sb_block;
ac27a0ec
DK		 3159 }
3160
a8ac900b 3161 if (!(bh = sb_bread_unmovable(sb, logical_sb_block))) {
b31e1552 3162 ext4_msg(sb, KERN_ERR, "unable to read superblock");
ac27a0ec
DK		 3163 goto out_fail;
3164 }
3165 /*
3166 * Note: s_es must be initialized as soon as possible because
617ba13b 3167 * some ext4 macro-instructions depend on its value
ac27a0ec 3168 */
2716b802 3169 es = (struct ext4_super_block *) (bh->b_data + offset);
ac27a0ec
DK		 3170 sbi->s_es = es;
3171 sb->s_magic = le16_to_cpu(es->s_magic);
617ba13b
MC		 3172 if (sb->s_magic != EXT4_SUPER_MAGIC)
3173 goto cantfind_ext4;
afc32f7e 3174 sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
ac27a0ec 3175
feb0ab32 3176 /* Warn if metadata_csum and gdt_csum are both set. */
e2b911c5
DW		 3177 if (ext4_has_feature_metadata_csum(sb) &&
3178 ext4_has_feature_gdt_csum(sb))
363307e6 3179 ext4_warning(sb, "metadata_csum and uninit_bg are "
feb0ab32
DW		 3180 "redundant flags; please run fsck.");
3181
d25425f8
DW		 3182 /* Check for a known checksum algorithm */
3183 if (!ext4_verify_csum_type(sb, es)) {
3184 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3185 "unknown checksum algorithm.");
3186 silent = 1;
3187 goto cantfind_ext4;
3188 }
3189
0441984a 3190 /* Load the checksum driver */
e2b911c5 3191 if (ext4_has_feature_metadata_csum(sb)) {
0441984a
DW		 3192 sbi->s_chksum_driver = crypto_alloc_shash("crc32c", 0, 0);
3193 if (IS_ERR(sbi->s_chksum_driver)) {
3194 ext4_msg(sb, KERN_ERR, "Cannot load crc32c driver.");
3195 ret = PTR_ERR(sbi->s_chksum_driver);
3196 sbi->s_chksum_driver = NULL;
3197 goto failed_mount;
3198 }
3199 }
3200
a9c47317
DW		 3201 /* Check superblock checksum */
3202 if (!ext4_superblock_csum_verify(sb, es)) {
3203 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3204 "invalid superblock checksum. Run e2fsck?");
3205 silent = 1;
6a797d27 3206 ret = -EFSBADCRC;
a9c47317
DW		 3207 goto cantfind_ext4;
3208 }
3209
3210 /* Precompute checksum seed for all metadata */
e2b911c5 3211 if (ext4_has_feature_csum_seed(sb))
8c81bd8f
DW		 3212 sbi->s_csum_seed = le32_to_cpu(es->s_checksum_seed);
3213 else if (ext4_has_metadata_csum(sb))
a9c47317
DW		 3214 sbi->s_csum_seed = ext4_chksum(sbi, ~0, es->s_uuid,
3215 sizeof(es->s_uuid));
3216
ac27a0ec
DK		 3217 /* Set defaults before we parse the mount options */
3218 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
fd8c37ec 3219 set_opt(sb, INIT_INODE_TABLE);
617ba13b 3220 if (def_mount_opts & EXT4_DEFM_DEBUG)
fd8c37ec 3221 set_opt(sb, DEBUG);
87f26807 3222 if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
fd8c37ec 3223 set_opt(sb, GRPID);
617ba13b 3224 if (def_mount_opts & EXT4_DEFM_UID16)
fd8c37ec 3225 set_opt(sb, NO_UID32);
ea663336 3226 /* xattr user namespace & acls are now defaulted on */
ea663336 3227 set_opt(sb, XATTR_USER);
03010a33 3228#ifdef CONFIG_EXT4_FS_POSIX_ACL
ea663336 3229 set_opt(sb, POSIX_ACL);
2e7842b8 3230#endif
98c1a759
DW		 3231 /* don't forget to enable journal_csum when metadata_csum is enabled. */
3232 if (ext4_has_metadata_csum(sb))
3233 set_opt(sb, JOURNAL_CHECKSUM);
3234
617ba13b 3235 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
fd8c37ec 3236 set_opt(sb, JOURNAL_DATA);
617ba13b 3237 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
fd8c37ec 3238 set_opt(sb, ORDERED_DATA);
617ba13b 3239 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
fd8c37ec 3240 set_opt(sb, WRITEBACK_DATA);
617ba13b
MC		 3241
3242 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
fd8c37ec 3243 set_opt(sb, ERRORS_PANIC);
bb4f397a 3244 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
fd8c37ec 3245 set_opt(sb, ERRORS_CONT);
bb4f397a 3246 else
fd8c37ec 3247 set_opt(sb, ERRORS_RO);
45f1a9c3
DW		 3248 /* block_validity enabled by default; disable with noblock_validity */
3249 set_opt(sb, BLOCK_VALIDITY);
8b67f04a 3250 if (def_mount_opts & EXT4_DEFM_DISCARD)
fd8c37ec 3251 set_opt(sb, DISCARD);
ac27a0ec 3252
08cefc7a
EB		 3253 sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));
3254 sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid));
30773840
TT		 3255 sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
3256 sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
3257 sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
ac27a0ec 3258
8b67f04a 3259 if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0)
fd8c37ec 3260 set_opt(sb, BARRIER);
ac27a0ec 3261
dd919b98
AK		 3262 /*
3263 * enable delayed allocation by default
3264 * Use -o nodelalloc to turn it off
3265 */
bc0b75f7 3266 if (!IS_EXT3_SB(sb) && !IS_EXT2_SB(sb) &&
8b67f04a 3267 ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0))
fd8c37ec 3268 set_opt(sb, DELALLOC);
dd919b98 3269
51ce6511
LC		 3270 /*
3271 * set default s_li_wait_mult for lazyinit, for the case there is
3272 * no mount option specified.
3273 */
3274 sbi->s_li_wait_mult = EXT4_DEF_LI_WAIT_MULT;
3275
8b67f04a 3276 if (!parse_options((char *) sbi->s_es->s_mount_opts, sb,
661aa520 3277 &journal_devnum, &journal_ioprio, 0)) {
8b67f04a
TT		 3278 ext4_msg(sb, KERN_WARNING,
3279 "failed to parse options in superblock: %s",
3280 sbi->s_es->s_mount_opts);
3281 }
5a916be1 3282 sbi->s_def_mount_opt = sbi->s_mount_opt;
b3881f74 3283 if (!parse_options((char *) data, sb, &journal_devnum,
661aa520 3284 &journal_ioprio, 0))
ac27a0ec
DK		 3285 goto failed_mount;
3286
56889787
TT		 3287 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
3288 printk_once(KERN_WARNING "EXT4-fs: Warning: mounting "
3289 "with data=journal disables delayed "
3290 "allocation and O_DIRECT support!\n");
3291 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
3292 ext4_msg(sb, KERN_ERR, "can't mount with "
3293 "both data=journal and delalloc");
3294 goto failed_mount;
3295 }
3296 if (test_opt(sb, DIOREAD_NOLOCK)) {
3297 ext4_msg(sb, KERN_ERR, "can't mount with "
6ae6514b 3298 "both data=journal and dioread_nolock");
56889787
TT		 3299 goto failed_mount;
3300 }
923ae0ff
RZ		 3301 if (test_opt(sb, DAX)) {
3302 ext4_msg(sb, KERN_ERR, "can't mount with "
3303 "both data=journal and dax");
3304 goto failed_mount;
3305 }
56889787
TT		 3306 if (test_opt(sb, DELALLOC))
3307 clear_opt(sb, DELALLOC);
001e4a87
TH		 3308 } else {
3309 sb->s_iflags |= SB_I_CGROUPWB;
56889787
TT		 3310 }
3311
ac27a0ec 3312 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
482a7425 3313 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec 3314
617ba13b 3315 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
e2b911c5
DW		 3316 (ext4_has_compat_features(sb) ||
3317 ext4_has_ro_compat_features(sb) ||
3318 ext4_has_incompat_features(sb)))
b31e1552
ES		 3319 ext4_msg(sb, KERN_WARNING,
3320 "feature flags set on rev 0 fs, "
3321 "running e2fsck is recommended");
469108ff 3322
ed3654eb
TT		 3323 if (es->s_creator_os == cpu_to_le32(EXT4_OS_HURD)) {
3324 set_opt2(sb, HURD_COMPAT);
e2b911c5 3325 if (ext4_has_feature_64bit(sb)) {
ed3654eb
TT		 3326 ext4_msg(sb, KERN_ERR,
3327 "The Hurd can't support 64-bit file systems");
3328 goto failed_mount;
3329 }
3330 }
3331
2035e776
TT		 3332 if (IS_EXT2_SB(sb)) {
3333 if (ext2_feature_set_ok(sb))
3334 ext4_msg(sb, KERN_INFO, "mounting ext2 file system "
3335 "using the ext4 subsystem");
3336 else {
3337 ext4_msg(sb, KERN_ERR, "couldn't mount as ext2 due "
3338 "to feature incompatibilities");
3339 goto failed_mount;
3340 }
3341 }
3342
3343 if (IS_EXT3_SB(sb)) {
3344 if (ext3_feature_set_ok(sb))
3345 ext4_msg(sb, KERN_INFO, "mounting ext3 file system "
3346 "using the ext4 subsystem");
3347 else {
3348 ext4_msg(sb, KERN_ERR, "couldn't mount as ext3 due "
3349 "to feature incompatibilities");
3350 goto failed_mount;
3351 }
3352 }
3353
ac27a0ec
DK		 3354 /*
3355 * Check feature flags regardless of the revision level, since we
3356 * previously didn't change the revision level when setting the flags,
3357 * so there is a chance incompat flags are set on a rev 0 filesystem.
3358 */
a13fb1a4 3359 if (!ext4_feature_set_ok(sb, (sb->s_flags & MS_RDONLY)))
ac27a0ec 3360 goto failed_mount;
a13fb1a4 3361
261cb20c 3362 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
617ba13b
MC		 3363 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
3364 blocksize > EXT4_MAX_BLOCK_SIZE) {
b31e1552
ES		 3365 ext4_msg(sb, KERN_ERR,
3366 "Unsupported filesystem blocksize %d", blocksize);
ac27a0ec
DK		 3367 goto failed_mount;
3368 }
3369
923ae0ff
RZ		 3370 if (sbi->s_mount_opt & EXT4_MOUNT_DAX) {
3371 if (blocksize != PAGE_SIZE) {
3372 ext4_msg(sb, KERN_ERR,
3373 "error: unsupported blocksize for dax");
3374 goto failed_mount;
3375 }
3376 if (!sb->s_bdev->bd_disk->fops->direct_access) {
3377 ext4_msg(sb, KERN_ERR,
3378 "error: device does not support dax");
3379 goto failed_mount;
3380 }
3381 }
3382
e2b911c5 3383 if (ext4_has_feature_encrypt(sb) && es->s_encryption_level) {
6ddb2447
TT		 3384 ext4_msg(sb, KERN_ERR, "Unsupported encryption level %d",
3385 es->s_encryption_level);
3386 goto failed_mount;
3387 }
3388
ac27a0ec 3389 if (sb->s_blocksize != blocksize) {
ce40733c
AK		 3390 /* Validate the filesystem blocksize */
3391 if (!sb_set_blocksize(sb, blocksize)) {
b31e1552 3392 ext4_msg(sb, KERN_ERR, "bad block size %d",
ce40733c 3393 blocksize);
ac27a0ec
DK		 3394 goto failed_mount;
3395 }
3396
2b2d6d01 3397 brelse(bh);
70bbb3e0
AM		 3398 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3399 offset = do_div(logical_sb_block, blocksize);
a8ac900b 3400 bh = sb_bread_unmovable(sb, logical_sb_block);
ac27a0ec 3401 if (!bh) {
b31e1552
ES		 3402 ext4_msg(sb, KERN_ERR,
3403 "Can't read superblock on 2nd try");
ac27a0ec
DK		 3404 goto failed_mount;
3405 }
2716b802 3406 es = (struct ext4_super_block *)(bh->b_data + offset);
ac27a0ec 3407 sbi->s_es = es;
617ba13b 3408 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
b31e1552
ES		 3409 ext4_msg(sb, KERN_ERR,
3410 "Magic mismatch, very weird!");
ac27a0ec
DK		 3411 goto failed_mount;
3412 }
3413 }
3414
e2b911c5 3415 has_huge_files = ext4_has_feature_huge_file(sb);
f287a1a5
TT		 3416 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
3417 has_huge_files);
3418 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
ac27a0ec 3419
617ba13b
MC		 3420 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
3421 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
3422 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
ac27a0ec
DK		 3423 } else {
3424 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
3425 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
617ba13b 3426 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
1330593e 3427 (!is_power_of_2(sbi->s_inode_size)) ||
ac27a0ec 3428 (sbi->s_inode_size > blocksize)) {
b31e1552
ES		 3429 ext4_msg(sb, KERN_ERR,
3430 "unsupported inode size: %d",
2b2d6d01 3431 sbi->s_inode_size);
ac27a0ec
DK		 3432 goto failed_mount;
3433 }
ef7f3835
KS		 3434 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
3435 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
ac27a0ec 3436 }
0b8e58a1 3437
0d1ee42f 3438 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
e2b911c5 3439 if (ext4_has_feature_64bit(sb)) {
8fadc143 3440 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
0d1ee42f 3441 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
d8ea6cf8 3442 !is_power_of_2(sbi->s_desc_size)) {
b31e1552
ES		 3443 ext4_msg(sb, KERN_ERR,
3444 "unsupported descriptor size %lu",
0d1ee42f
AR		 3445 sbi->s_desc_size);
3446 goto failed_mount;
3447 }
3448 } else
3449 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
0b8e58a1 3450
ac27a0ec 3451 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
ac27a0ec 3452 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
b47b6f38 3453 if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
617ba13b 3454 goto cantfind_ext4;
0b8e58a1 3455
617ba13b 3456 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
ac27a0ec 3457 if (sbi->s_inodes_per_block == 0)
617ba13b 3458 goto cantfind_ext4;
ac27a0ec
DK		 3459 sbi->s_itb_per_group = sbi->s_inodes_per_group /
3460 sbi->s_inodes_per_block;
0d1ee42f 3461 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
ac27a0ec
DK		 3462 sbi->s_sbh = bh;
3463 sbi->s_mount_state = le16_to_cpu(es->s_state);
e57aa839
FW		 3464 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
3465 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
0b8e58a1 3466
2b2d6d01 3467 for (i = 0; i < 4; i++)
ac27a0ec
DK		 3468 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
3469 sbi->s_def_hash_version = es->s_def_hash_version;
e2b911c5 3470 if (ext4_has_feature_dir_index(sb)) {
23301410
TT		 3471 i = le32_to_cpu(es->s_flags);
3472 if (i & EXT2_FLAGS_UNSIGNED_HASH)
3473 sbi->s_hash_unsigned = 3;
3474 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
f99b2589 3475#ifdef __CHAR_UNSIGNED__
23301410
TT		 3476 if (!(sb->s_flags & MS_RDONLY))
3477 es->s_flags |=
3478 cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
3479 sbi->s_hash_unsigned = 3;
f99b2589 3480#else
23301410
TT		 3481 if (!(sb->s_flags & MS_RDONLY))
3482 es->s_flags |=
3483 cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
f99b2589 3484#endif
23301410 3485 }
f99b2589 3486 }
ac27a0ec 3487
281b5995
TT		 3488 /* Handle clustersize */
3489 clustersize = BLOCK_SIZE << le32_to_cpu(es->s_log_cluster_size);
e2b911c5 3490 has_bigalloc = ext4_has_feature_bigalloc(sb);
281b5995
TT		 3491 if (has_bigalloc) {
3492 if (clustersize < blocksize) {
3493 ext4_msg(sb, KERN_ERR,
3494 "cluster size (%d) smaller than "
3495 "block size (%d)", clustersize, blocksize);
3496 goto failed_mount;
3497 }
3498 sbi->s_cluster_bits = le32_to_cpu(es->s_log_cluster_size) -
3499 le32_to_cpu(es->s_log_block_size);
3500 sbi->s_clusters_per_group =
3501 le32_to_cpu(es->s_clusters_per_group);
3502 if (sbi->s_clusters_per_group > blocksize * 8) {
3503 ext4_msg(sb, KERN_ERR,
3504 "#clusters per group too big: %lu",
3505 sbi->s_clusters_per_group);
3506 goto failed_mount;
3507 }
3508 if (sbi->s_blocks_per_group !=
3509 (sbi->s_clusters_per_group * (clustersize / blocksize))) {
3510 ext4_msg(sb, KERN_ERR, "blocks per group (%lu) and "
3511 "clusters per group (%lu) inconsistent",
3512 sbi->s_blocks_per_group,
3513 sbi->s_clusters_per_group);
3514 goto failed_mount;
3515 }
3516 } else {
3517 if (clustersize != blocksize) {
3518 ext4_warning(sb, "fragment/cluster size (%d) != "
3519 "block size (%d)", clustersize,
3520 blocksize);
3521 clustersize = blocksize;
3522 }
3523 if (sbi->s_blocks_per_group > blocksize * 8) {
3524 ext4_msg(sb, KERN_ERR,
3525 "#blocks per group too big: %lu",
3526 sbi->s_blocks_per_group);
3527 goto failed_mount;
3528 }
3529 sbi->s_clusters_per_group = sbi->s_blocks_per_group;
3530 sbi->s_cluster_bits = 0;
ac27a0ec 3531 }
281b5995
TT		 3532 sbi->s_cluster_ratio = clustersize / blocksize;
3533
ac27a0ec 3534 if (sbi->s_inodes_per_group > blocksize * 8) {
b31e1552
ES		 3535 ext4_msg(sb, KERN_ERR,
3536 "#inodes per group too big: %lu",
2b2d6d01 3537 sbi->s_inodes_per_group);
ac27a0ec
DK		 3538 goto failed_mount;
3539 }
3540
960fd856
TT		 3541 /* Do we have standard group size of clustersize * 8 blocks ? */
3542 if (sbi->s_blocks_per_group == clustersize << 3)
3543 set_opt2(sb, STD_GROUP_SIZE);
3544
bf43d84b
ES		 3545 /*
3546 * Test whether we have more sectors than will fit in sector_t,
3547 * and whether the max offset is addressable by the page cache.
3548 */
5a9ae68a 3549 err = generic_check_addressable(sb->s_blocksize_bits,
30ca22c7 3550 ext4_blocks_count(es));
5a9ae68a 3551 if (err) {
b31e1552 3552 ext4_msg(sb, KERN_ERR, "filesystem"
bf43d84b 3553 " too large to mount safely on this system");
ac27a0ec 3554 if (sizeof(sector_t) < 8)
90c699a9 3555 ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled");
ac27a0ec
DK		 3556 goto failed_mount;
3557 }
3558
617ba13b
MC		 3559 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
3560 goto cantfind_ext4;
e7c95593 3561
0f2ddca6
FTN		 3562 /* check blocks count against device size */
3563 blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
3564 if (blocks_count && ext4_blocks_count(es) > blocks_count) {
b31e1552
ES		 3565 ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
3566 "exceeds size of device (%llu blocks)",
0f2ddca6
FTN		 3567 ext4_blocks_count(es), blocks_count);
3568 goto failed_mount;
3569 }
3570
0b8e58a1
AD		 3571 /*
3572 * It makes no sense for the first data block to be beyond the end
3573 * of the filesystem.
3574 */
3575 if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
5635a62b 3576 ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
b31e1552
ES		 3577 "block %u is beyond end of filesystem (%llu)",
3578 le32_to_cpu(es->s_first_data_block),
3579 ext4_blocks_count(es));
e7c95593
ES		 3580 goto failed_mount;
3581 }
bd81d8ee
LV		 3582 blocks_count = (ext4_blocks_count(es) -
3583 le32_to_cpu(es->s_first_data_block) +
3584 EXT4_BLOCKS_PER_GROUP(sb) - 1);
3585 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
4ec11028 3586 if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
b31e1552 3587 ext4_msg(sb, KERN_WARNING, "groups count too large: %u "
4ec11028 3588 "(block count %llu, first data block %u, "
b31e1552 3589 "blocks per group %lu)", sbi->s_groups_count,
4ec11028
TT		 3590 ext4_blocks_count(es),
3591 le32_to_cpu(es->s_first_data_block),
3592 EXT4_BLOCKS_PER_GROUP(sb));
3593 goto failed_mount;
3594 }
bd81d8ee 3595 sbi->s_groups_count = blocks_count;
fb0a387d
ES		 3596 sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
3597 (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
617ba13b
MC		 3598 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
3599 EXT4_DESC_PER_BLOCK(sb);
f18a5f21
TT		 3600 sbi->s_group_desc = ext4_kvmalloc(db_count *
3601 sizeof(struct buffer_head *),
3602 GFP_KERNEL);
ac27a0ec 3603 if (sbi->s_group_desc == NULL) {
b31e1552 3604 ext4_msg(sb, KERN_ERR, "not enough memory");
2cde417d 3605 ret = -ENOMEM;
ac27a0ec
DK		 3606 goto failed_mount;
3607 }
3608
705895b6 3609 bgl_lock_init(sbi->s_blockgroup_lock);
ac27a0ec
DK		 3610
3611 for (i = 0; i < db_count; i++) {
70bbb3e0 3612 block = descriptor_loc(sb, logical_sb_block, i);
a8ac900b 3613 sbi->s_group_desc[i] = sb_bread_unmovable(sb, block);
ac27a0ec 3614 if (!sbi->s_group_desc[i]) {
b31e1552
ES		 3615 ext4_msg(sb, KERN_ERR,
3616 "can't read group descriptor %d", i);
ac27a0ec
DK		 3617 db_count = i;
3618 goto failed_mount2;
3619 }
3620 }
bfff6873 3621 if (!ext4_check_descriptors(sb, &first_not_zeroed)) {
b31e1552 3622 ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
6a797d27 3623 ret = -EFSCORRUPTED;
f9ae9cf5 3624 goto failed_mount2;
ac27a0ec 3625 }
772cb7c8 3626
f9ae9cf5 3627 sbi->s_gdb_count = db_count;
ac27a0ec
DK		 3628 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
3629 spin_lock_init(&sbi->s_next_gen_lock);
3630
04ecddb7
JM		 3631 setup_timer(&sbi->s_err_report, print_daily_error_info,
3632 (unsigned long) sb);
04496411 3633
a75ae78f 3634 /* Register extent status tree shrinker */
eb68d0e2 3635 if (ext4_es_register_shrinker(sbi))
ce7e010a 3636 goto failed_mount3;
ce7e010a 3637
c9de560d 3638 sbi->s_stripe = ext4_get_stripe_size(sbi);
67a5da56 3639 sbi->s_extent_max_zeroout_kb = 32;
c9de560d 3640
f9ae9cf5
TT		 3641 /*
3642 * set up enough so that it can read an inode
3643 */
f6e63f90 3644 sb->s_op = &ext4_sops;
617ba13b
MC		 3645 sb->s_export_op = &ext4_export_ops;
3646 sb->s_xattr = ext4_xattr_handlers;
ac27a0ec 3647#ifdef CONFIG_QUOTA
617ba13b 3648 sb->dq_op = &ext4_quota_operations;
e2b911c5 3649 if (ext4_has_feature_quota(sb))
1fa5efe3 3650 sb->s_qcop = &dquot_quotactl_sysfile_ops;
262b4662
JK		 3651 else
3652 sb->s_qcop = &ext4_qctl_operations;
96c7e0d9 3653 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
ac27a0ec 3654#endif
f2fa2ffc
AK		 3655 memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
3656
ac27a0ec 3657 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
3b9d4ed2 3658 mutex_init(&sbi->s_orphan_lock);
ac27a0ec
DK		 3659
3660 sb->s_root = NULL;
3661
3662 needs_recovery = (es->s_last_orphan != 0 ||
e2b911c5 3663 ext4_has_feature_journal_needs_recovery(sb));
ac27a0ec 3664
e2b911c5 3665 if (ext4_has_feature_mmp(sb) && !(sb->s_flags & MS_RDONLY))
c5e06d10 3666 if (ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block)))
50460fe8 3667 goto failed_mount3a;
c5e06d10 3668
ac27a0ec
DK		 3669 /*
3670 * The first inode we look at is the journal inode. Don't try
3671 * root first: it may be modified in the journal!
3672 */
e2b911c5 3673 if (!test_opt(sb, NOLOAD) && ext4_has_feature_journal(sb)) {
617ba13b 3674 if (ext4_load_journal(sb, es, journal_devnum))
50460fe8 3675 goto failed_mount3a;
0390131b 3676 } else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) &&
e2b911c5 3677 ext4_has_feature_journal_needs_recovery(sb)) {
b31e1552
ES		 3678 ext4_msg(sb, KERN_ERR, "required journal recovery "
3679 "suppressed and not mounted read-only");
744692dc 3680 goto failed_mount_wq;
ac27a0ec 3681 } else {
1e381f60
DM		 3682 /* Nojournal mode, all journal mount options are illegal */
3683 if (test_opt2(sb, EXPLICIT_JOURNAL_CHECKSUM)) {
3684 ext4_msg(sb, KERN_ERR, "can't mount with "
3685 "journal_checksum, fs mounted w/o journal");
3686 goto failed_mount_wq;
3687 }
3688 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
3689 ext4_msg(sb, KERN_ERR, "can't mount with "
3690 "journal_async_commit, fs mounted w/o journal");
3691 goto failed_mount_wq;
3692 }
3693 if (sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) {
3694 ext4_msg(sb, KERN_ERR, "can't mount with "
3695 "commit=%lu, fs mounted w/o journal",
3696 sbi->s_commit_interval / HZ);
3697 goto failed_mount_wq;
3698 }
3699 if (EXT4_MOUNT_DATA_FLAGS &
3700 (sbi->s_mount_opt ^ sbi->s_def_mount_opt)) {
3701 ext4_msg(sb, KERN_ERR, "can't mount with "
3702 "data=, fs mounted w/o journal");
3703 goto failed_mount_wq;
3704 }
3705 sbi->s_def_mount_opt &= EXT4_MOUNT_JOURNAL_CHECKSUM;
3706 clear_opt(sb, JOURNAL_CHECKSUM);
fd8c37ec 3707 clear_opt(sb, DATA_FLAGS);
0390131b
FM		 3708 sbi->s_journal = NULL;
3709 needs_recovery = 0;
3710 goto no_journal;
ac27a0ec
DK		 3711 }
3712
e2b911c5 3713 if (ext4_has_feature_64bit(sb) &&
eb40a09c
JS		 3714 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
3715 JBD2_FEATURE_INCOMPAT_64BIT)) {
b31e1552 3716 ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
744692dc 3717 goto failed_mount_wq;
eb40a09c
JS		 3718 }
3719
25ed6e8a
DW		 3720 if (!set_journal_csum_feature_set(sb)) {
3721 ext4_msg(sb, KERN_ERR, "Failed to set journal checksum "
3722 "feature set");
3723 goto failed_mount_wq;
d4da6c9c 3724 }
818d276c 3725
ac27a0ec
DK		 3726 /* We have now updated the journal if required, so we can
3727 * validate the data journaling mode. */
3728 switch (test_opt(sb, DATA_FLAGS)) {
3729 case 0:
3730 /* No mode set, assume a default based on the journal
63f57933
AM		 3731 * capabilities: ORDERED_DATA if the journal can
3732 * cope, else JOURNAL_DATA
3733 */
dab291af
MC		 3734 if (jbd2_journal_check_available_features
3735 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
fd8c37ec 3736 set_opt(sb, ORDERED_DATA);
ac27a0ec 3737 else
fd8c37ec 3738 set_opt(sb, JOURNAL_DATA);
ac27a0ec
DK		 3739 break;
3740
617ba13b
MC		 3741 case EXT4_MOUNT_ORDERED_DATA:
3742 case EXT4_MOUNT_WRITEBACK_DATA:
dab291af
MC		 3743 if (!jbd2_journal_check_available_features
3744 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
b31e1552
ES		 3745 ext4_msg(sb, KERN_ERR, "Journal does not support "
3746 "requested data journaling mode");
744692dc 3747 goto failed_mount_wq;
ac27a0ec
DK		 3748 }
3749 default:
3750 break;
3751 }
b3881f74 3752 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
ac27a0ec 3753
18aadd47
BJ		 3754 sbi->s_journal->j_commit_callback = ext4_journal_commit_callback;
3755
ce7e010a 3756no_journal:
9c191f70
M		 3757 if (ext4_mballoc_ready) {
3758 sbi->s_mb_cache = ext4_xattr_create_cache(sb->s_id);
3759 if (!sbi->s_mb_cache) {
3760 ext4_msg(sb, KERN_ERR, "Failed to create an mb_cache");
3761 goto failed_mount_wq;
3762 }
3763 }
3764
e2b911c5 3765 if ((DUMMY_ENCRYPTION_ENABLED(sbi) || ext4_has_feature_encrypt(sb)) &&
1cb767cd
TT		 3766 (blocksize != PAGE_CACHE_SIZE)) {
3767 ext4_msg(sb, KERN_ERR,
3768 "Unsupported blocksize for fs encryption");
3769 goto failed_mount_wq;
3770 }
3771
e2b911c5
DW		 3772 if (DUMMY_ENCRYPTION_ENABLED(sbi) && !(sb->s_flags & MS_RDONLY) &&
3773 !ext4_has_feature_encrypt(sb)) {
3774 ext4_set_feature_encrypt(sb);
6ddb2447
TT		 3775 ext4_commit_super(sb, 1);
3776 }
3777
952fc18e
TT		 3778 /*
3779 * Get the # of file system overhead blocks from the
3780 * superblock if present.
3781 */
3782 if (es->s_overhead_clusters)
3783 sbi->s_overhead = le32_to_cpu(es->s_overhead_clusters);
3784 else {
07aa2ea1
LC		 3785 err = ext4_calculate_overhead(sb);
3786 if (err)
952fc18e
TT		 3787 goto failed_mount_wq;
3788 }
3789
fd89d5f2
TH		 3790 /*
3791 * The maximum number of concurrent works can be high and
3792 * concurrency isn't really necessary. Limit it to 1.
3793 */
2e8fa54e
JK		 3794 EXT4_SB(sb)->rsv_conversion_wq =
3795 alloc_workqueue("ext4-rsv-conversion", WQ_MEM_RECLAIM | WQ_UNBOUND, 1);
3796 if (!EXT4_SB(sb)->rsv_conversion_wq) {
3797 printk(KERN_ERR "EXT4-fs: failed to create workqueue\n");
07aa2ea1 3798 ret = -ENOMEM;
2e8fa54e
JK		 3799 goto failed_mount4;
3800 }
3801
ac27a0ec 3802 /*
dab291af 3803 * The jbd2_journal_load will have done any necessary log recovery,
ac27a0ec
DK		 3804 * so we can safely mount the rest of the filesystem now.
3805 */
3806
1d1fe1ee
DH		 3807 root = ext4_iget(sb, EXT4_ROOT_INO);
3808 if (IS_ERR(root)) {
b31e1552 3809 ext4_msg(sb, KERN_ERR, "get root inode failed");
1d1fe1ee 3810 ret = PTR_ERR(root);
32a9bb57 3811 root = NULL;
ac27a0ec
DK		 3812 goto failed_mount4;
3813 }
3814 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
b31e1552 3815 ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
94bf608a 3816 iput(root);
ac27a0ec
DK		 3817 goto failed_mount4;
3818 }
48fde701 3819 sb->s_root = d_make_root(root);
1d1fe1ee 3820 if (!sb->s_root) {
b31e1552 3821 ext4_msg(sb, KERN_ERR, "get root dentry failed");
1d1fe1ee
DH		 3822 ret = -ENOMEM;
3823 goto failed_mount4;
3824 }
ac27a0ec 3825
7e84b621
ES		 3826 if (ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY))
3827 sb->s_flags |= MS_RDONLY;
ef7f3835
KS		 3828
3829 /* determine the minimum size of new large inodes, if present */
3830 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
3831 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
3832 EXT4_GOOD_OLD_INODE_SIZE;
e2b911c5 3833 if (ext4_has_feature_extra_isize(sb)) {
ef7f3835
KS		 3834 if (sbi->s_want_extra_isize <
3835 le16_to_cpu(es->s_want_extra_isize))
3836 sbi->s_want_extra_isize =
3837 le16_to_cpu(es->s_want_extra_isize);
3838 if (sbi->s_want_extra_isize <
3839 le16_to_cpu(es->s_min_extra_isize))
3840 sbi->s_want_extra_isize =
3841 le16_to_cpu(es->s_min_extra_isize);
3842 }
3843 }
3844 /* Check if enough inode space is available */
3845 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
3846 sbi->s_inode_size) {
3847 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
3848 EXT4_GOOD_OLD_INODE_SIZE;
b31e1552
ES		 3849 ext4_msg(sb, KERN_INFO, "required extra inode space not"
3850 "available");
ef7f3835
KS		 3851 }
3852
b5799018 3853 ext4_set_resv_clusters(sb);
27dd4385 3854
6fd058f7
TT		 3855 err = ext4_setup_system_zone(sb);
3856 if (err) {
b31e1552 3857 ext4_msg(sb, KERN_ERR, "failed to initialize system "
fbe845dd 3858 "zone (%d)", err);
f9ae9cf5
TT		 3859 goto failed_mount4a;
3860 }
3861
3862 ext4_ext_init(sb);
3863 err = ext4_mb_init(sb);
3864 if (err) {
3865 ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)",
3866 err);
dcf2d804 3867 goto failed_mount5;
c2774d84
AK		 3868 }
3869
d5e03cbb
TT		 3870 block = ext4_count_free_clusters(sb);
3871 ext4_free_blocks_count_set(sbi->s_es,
3872 EXT4_C2B(sbi, block));
908c7f19
TH		 3873 err = percpu_counter_init(&sbi->s_freeclusters_counter, block,
3874 GFP_KERNEL);
d5e03cbb
TT		 3875 if (!err) {
3876 unsigned long freei = ext4_count_free_inodes(sb);
3877 sbi->s_es->s_free_inodes_count = cpu_to_le32(freei);
908c7f19
TH		 3878 err = percpu_counter_init(&sbi->s_freeinodes_counter, freei,
3879 GFP_KERNEL);
d5e03cbb
TT		 3880 }
3881 if (!err)
3882 err = percpu_counter_init(&sbi->s_dirs_counter,
908c7f19 3883 ext4_count_dirs(sb), GFP_KERNEL);
d5e03cbb 3884 if (!err)
908c7f19
TH		 3885 err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0,
3886 GFP_KERNEL);
d5e03cbb
TT		 3887 if (err) {
3888 ext4_msg(sb, KERN_ERR, "insufficient memory");
3889 goto failed_mount6;
3890 }
3891
e2b911c5 3892 if (ext4_has_feature_flex_bg(sb))
d5e03cbb
TT		 3893 if (!ext4_fill_flex_info(sb)) {
3894 ext4_msg(sb, KERN_ERR,
3895 "unable to initialize "
3896 "flex_bg meta info!");
3897 goto failed_mount6;
3898 }
3899
bfff6873
LC		 3900 err = ext4_register_li_request(sb, first_not_zeroed);
3901 if (err)
dcf2d804 3902 goto failed_mount6;
bfff6873 3903
b5799018 3904 err = ext4_register_sysfs(sb);
dcf2d804
TM		 3905 if (err)
3906 goto failed_mount7;
3197ebdb 3907
9b2ff357
JK		 3908#ifdef CONFIG_QUOTA
3909 /* Enable quota usage during mount. */
e2b911c5 3910 if (ext4_has_feature_quota(sb) && !(sb->s_flags & MS_RDONLY)) {
9b2ff357
JK		 3911 err = ext4_enable_quotas(sb);
3912 if (err)
3913 goto failed_mount8;
3914 }
3915#endif /* CONFIG_QUOTA */
3916
617ba13b
MC		 3917 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
3918 ext4_orphan_cleanup(sb, es);
3919 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
0390131b 3920 if (needs_recovery) {
b31e1552 3921 ext4_msg(sb, KERN_INFO, "recovery complete");
0390131b
FM		 3922 ext4_mark_recovery_complete(sb, es);
3923 }
3924 if (EXT4_SB(sb)->s_journal) {
3925 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
3926 descr = " journalled data mode";
3927 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
3928 descr = " ordered data mode";
3929 else
3930 descr = " writeback data mode";
3931 } else
3932 descr = "out journal";
3933
79add3a3
LC		 3934 if (test_opt(sb, DISCARD)) {
3935 struct request_queue *q = bdev_get_queue(sb->s_bdev);
3936 if (!blk_queue_discard(q))
3937 ext4_msg(sb, KERN_WARNING,
3938 "mounting with \"discard\" option, but "
3939 "the device does not support discard");
3940 }
3941
e294a537
TT		 3942 if (___ratelimit(&ext4_mount_msg_ratelimit, "EXT4-fs mount"))
3943 ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. "
3944 "Opts: %s%s%s", descr, sbi->s_es->s_mount_opts,
3945 *sbi->s_es->s_mount_opts ? "; " : "", orig_data);
ac27a0ec 3946
66e61a9e
TT		 3947 if (es->s_error_count)
3948 mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */
ac27a0ec 3949
efbed4dc
TT		 3950 /* Enable message ratelimiting. Default is 10 messages per 5 secs. */
3951 ratelimit_state_init(&sbi->s_err_ratelimit_state, 5 * HZ, 10);
3952 ratelimit_state_init(&sbi->s_warning_ratelimit_state, 5 * HZ, 10);
3953 ratelimit_state_init(&sbi->s_msg_ratelimit_state, 5 * HZ, 10);
3954
d4c402d9 3955 kfree(orig_data);
ac27a0ec
DK		 3956 return 0;
3957
617ba13b 3958cantfind_ext4:
ac27a0ec 3959 if (!silent)
b31e1552 3960 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
ac27a0ec
DK		 3961 goto failed_mount;
3962
72ba7450
TT		 3963#ifdef CONFIG_QUOTA
3964failed_mount8:
ebd173be 3965 ext4_unregister_sysfs(sb);
72ba7450 3966#endif
dcf2d804
TM		 3967failed_mount7:
3968 ext4_unregister_li_request(sb);
3969failed_mount6:
f9ae9cf5 3970 ext4_mb_release(sb);
d5e03cbb 3971 if (sbi->s_flex_groups)
b93b41d4 3972 kvfree(sbi->s_flex_groups);
d5e03cbb
TT		 3973 percpu_counter_destroy(&sbi->s_freeclusters_counter);
3974 percpu_counter_destroy(&sbi->s_freeinodes_counter);
3975 percpu_counter_destroy(&sbi->s_dirs_counter);
3976 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
00764937 3977failed_mount5:
f9ae9cf5
TT		 3978 ext4_ext_release(sb);
3979 ext4_release_system_zone(sb);
3980failed_mount4a:
94bf608a 3981 dput(sb->s_root);
32a9bb57 3982 sb->s_root = NULL;
94bf608a 3983failed_mount4:
b31e1552 3984 ext4_msg(sb, KERN_ERR, "mount failed");
2e8fa54e
JK		 3985 if (EXT4_SB(sb)->rsv_conversion_wq)
3986 destroy_workqueue(EXT4_SB(sb)->rsv_conversion_wq);
4c0425ff 3987failed_mount_wq:
0390131b
FM		 3988 if (sbi->s_journal) {
3989 jbd2_journal_destroy(sbi->s_journal);
3990 sbi->s_journal = NULL;
3991 }
50460fe8 3992failed_mount3a:
d3922a77 3993 ext4_es_unregister_shrinker(sbi);
eb68d0e2 3994failed_mount3:
9105bb14 3995 del_timer_sync(&sbi->s_err_report);
c5e06d10
JL		 3996 if (sbi->s_mmp_tsk)
3997 kthread_stop(sbi->s_mmp_tsk);
ac27a0ec
DK		 3998failed_mount2:
3999 for (i = 0; i < db_count; i++)
4000 brelse(sbi->s_group_desc[i]);
b93b41d4 4001 kvfree(sbi->s_group_desc);
ac27a0ec 4002failed_mount:
0441984a
DW		 4003 if (sbi->s_chksum_driver)
4004 crypto_free_shash(sbi->s_chksum_driver);
ac27a0ec 4005#ifdef CONFIG_QUOTA
a2d4a646 4006 for (i = 0; i < EXT4_MAXQUOTAS; i++)
ac27a0ec
DK		 4007 kfree(sbi->s_qf_names[i]);
4008#endif
617ba13b 4009 ext4_blkdev_remove(sbi);
ac27a0ec
DK		 4010 brelse(bh);
4011out_fail:
4012 sb->s_fs_info = NULL;
f6830165 4013 kfree(sbi->s_blockgroup_lock);
ac27a0ec 4014 kfree(sbi);
dcc7dae3 4015out_free_orig:
d4c402d9 4016 kfree(orig_data);
07aa2ea1 4017 return err ? err : ret;
ac27a0ec
DK		 4018}
4019
4020/*
4021 * Setup any per-fs journal parameters now. We'll do this both on
4022 * initial mount, once the journal has been initialised but before we've
4023 * done any recovery; and again on any subsequent remount.
4024 */
617ba13b 4025static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
ac27a0ec 4026{
617ba13b 4027 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4028
30773840
TT		 4029 journal->j_commit_interval = sbi->s_commit_interval;
4030 journal->j_min_batch_time = sbi->s_min_batch_time;
4031 journal->j_max_batch_time = sbi->s_max_batch_time;
ac27a0ec 4032
a931da6a 4033 write_lock(&journal->j_state_lock);
ac27a0ec 4034 if (test_opt(sb, BARRIER))
dab291af 4035 journal->j_flags |= JBD2_BARRIER;
ac27a0ec 4036 else
dab291af 4037 journal->j_flags &= ~JBD2_BARRIER;
5bf5683a
HK		 4038 if (test_opt(sb, DATA_ERR_ABORT))
4039 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
4040 else
4041 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
a931da6a 4042 write_unlock(&journal->j_state_lock);
ac27a0ec
DK		 4043}
4044
617ba13b 4045static journal_t *ext4_get_journal(struct super_block *sb,
ac27a0ec
DK		 4046 unsigned int journal_inum)
4047{
4048 struct inode *journal_inode;
4049 journal_t *journal;
4050
e2b911c5 4051 BUG_ON(!ext4_has_feature_journal(sb));
0390131b 4052
ac27a0ec
DK		 4053 /* First, test for the existence of a valid inode on disk. Bad
4054 * things happen if we iget() an unused inode, as the subsequent
4055 * iput() will try to delete it. */
4056
1d1fe1ee
DH		 4057 journal_inode = ext4_iget(sb, journal_inum);
4058 if (IS_ERR(journal_inode)) {
b31e1552 4059 ext4_msg(sb, KERN_ERR, "no journal found");
ac27a0ec
DK		 4060 return NULL;
4061 }
4062 if (!journal_inode->i_nlink) {
4063 make_bad_inode(journal_inode);
4064 iput(journal_inode);
b31e1552 4065 ext4_msg(sb, KERN_ERR, "journal inode is deleted");
ac27a0ec
DK		 4066 return NULL;
4067 }
4068
e5f8eab8 4069 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
ac27a0ec 4070 journal_inode, journal_inode->i_size);
1d1fe1ee 4071 if (!S_ISREG(journal_inode->i_mode)) {
b31e1552 4072 ext4_msg(sb, KERN_ERR, "invalid journal inode");
ac27a0ec
DK		 4073 iput(journal_inode);
4074 return NULL;
4075 }
4076
dab291af 4077 journal = jbd2_journal_init_inode(journal_inode);
ac27a0ec 4078 if (!journal) {
b31e1552 4079 ext4_msg(sb, KERN_ERR, "Could not load journal inode");
ac27a0ec
DK		 4080 iput(journal_inode);
4081 return NULL;
4082 }
4083 journal->j_private = sb;
617ba13b 4084 ext4_init_journal_params(sb, journal);
ac27a0ec
DK		 4085 return journal;
4086}
4087
617ba13b 4088static journal_t *ext4_get_dev_journal(struct super_block *sb,
ac27a0ec
DK		 4089 dev_t j_dev)
4090{
2b2d6d01 4091 struct buffer_head *bh;
ac27a0ec 4092 journal_t *journal;
617ba13b
MC		 4093 ext4_fsblk_t start;
4094 ext4_fsblk_t len;
ac27a0ec 4095 int hblock, blocksize;
617ba13b 4096 ext4_fsblk_t sb_block;
ac27a0ec 4097 unsigned long offset;
2b2d6d01 4098 struct ext4_super_block *es;
ac27a0ec
DK		 4099 struct block_device *bdev;
4100
e2b911c5 4101 BUG_ON(!ext4_has_feature_journal(sb));
0390131b 4102
b31e1552 4103 bdev = ext4_blkdev_get(j_dev, sb);
ac27a0ec
DK		 4104 if (bdev == NULL)
4105 return NULL;
4106
ac27a0ec 4107 blocksize = sb->s_blocksize;
e1defc4f 4108 hblock = bdev_logical_block_size(bdev);
ac27a0ec 4109 if (blocksize < hblock) {
b31e1552
ES		 4110 ext4_msg(sb, KERN_ERR,
4111 "blocksize too small for journal device");
ac27a0ec
DK		 4112 goto out_bdev;
4113 }
4114
617ba13b
MC		 4115 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
4116 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
ac27a0ec
DK		 4117 set_blocksize(bdev, blocksize);
4118 if (!(bh = __bread(bdev, sb_block, blocksize))) {
b31e1552
ES		 4119 ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
4120 "external journal");
ac27a0ec
DK		 4121 goto out_bdev;
4122 }
4123
2716b802 4124 es = (struct ext4_super_block *) (bh->b_data + offset);
617ba13b 4125 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
ac27a0ec 4126 !(le32_to_cpu(es->s_feature_incompat) &
617ba13b 4127 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
b31e1552
ES		 4128 ext4_msg(sb, KERN_ERR, "external journal has "
4129 "bad superblock");
ac27a0ec
DK		 4130 brelse(bh);
4131 goto out_bdev;
4132 }
4133
df4763be
DW		 4134 if ((le32_to_cpu(es->s_feature_ro_compat) &
4135 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) &&
4136 es->s_checksum != ext4_superblock_csum(sb, es)) {
4137 ext4_msg(sb, KERN_ERR, "external journal has "
4138 "corrupt superblock");
4139 brelse(bh);
4140 goto out_bdev;
4141 }
4142
617ba13b 4143 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
b31e1552 4144 ext4_msg(sb, KERN_ERR, "journal UUID does not match");
ac27a0ec
DK		 4145 brelse(bh);
4146 goto out_bdev;
4147 }
4148
bd81d8ee 4149 len = ext4_blocks_count(es);
ac27a0ec
DK		 4150 start = sb_block + 1;
4151 brelse(bh); /* we're done with the superblock */
4152
dab291af 4153 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
ac27a0ec
DK		 4154 start, len, blocksize);
4155 if (!journal) {
b31e1552 4156 ext4_msg(sb, KERN_ERR, "failed to create device journal");
ac27a0ec
DK		 4157 goto out_bdev;
4158 }
4159 journal->j_private = sb;
9f203507 4160 ll_rw_block(READ | REQ_META | REQ_PRIO, 1, &journal->j_sb_buffer);
ac27a0ec
DK		 4161 wait_on_buffer(journal->j_sb_buffer);
4162 if (!buffer_uptodate(journal->j_sb_buffer)) {
b31e1552 4163 ext4_msg(sb, KERN_ERR, "I/O error on journal device");
ac27a0ec
DK		 4164 goto out_journal;
4165 }
4166 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
b31e1552
ES		 4167 ext4_msg(sb, KERN_ERR, "External journal has more than one "
4168 "user (unsupported) - %d",
ac27a0ec
DK		 4169 be32_to_cpu(journal->j_superblock->s_nr_users));
4170 goto out_journal;
4171 }
617ba13b
MC		 4172 EXT4_SB(sb)->journal_bdev = bdev;
4173 ext4_init_journal_params(sb, journal);
ac27a0ec 4174 return journal;
0b8e58a1 4175
ac27a0ec 4176out_journal:
dab291af 4177 jbd2_journal_destroy(journal);
ac27a0ec 4178out_bdev:
617ba13b 4179 ext4_blkdev_put(bdev);
ac27a0ec
DK		 4180 return NULL;
4181}
4182
617ba13b
MC		 4183static int ext4_load_journal(struct super_block *sb,
4184 struct ext4_super_block *es,
ac27a0ec
DK		 4185 unsigned long journal_devnum)
4186{
4187 journal_t *journal;
4188 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
4189 dev_t journal_dev;
4190 int err = 0;
4191 int really_read_only;
4192
e2b911c5 4193 BUG_ON(!ext4_has_feature_journal(sb));
0390131b 4194
ac27a0ec
DK		 4195 if (journal_devnum &&
4196 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
b31e1552
ES		 4197 ext4_msg(sb, KERN_INFO, "external journal device major/minor "
4198 "numbers have changed");
ac27a0ec
DK		 4199 journal_dev = new_decode_dev(journal_devnum);
4200 } else
4201 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
4202
4203 really_read_only = bdev_read_only(sb->s_bdev);
4204
4205 /*
4206 * Are we loading a blank journal or performing recovery after a
4207 * crash? For recovery, we need to check in advance whether we
4208 * can get read-write access to the device.
4209 */
e2b911c5 4210 if (ext4_has_feature_journal_needs_recovery(sb)) {
ac27a0ec 4211 if (sb->s_flags & MS_RDONLY) {
b31e1552
ES		 4212 ext4_msg(sb, KERN_INFO, "INFO: recovery "
4213 "required on readonly filesystem");
ac27a0ec 4214 if (really_read_only) {
b31e1552
ES		 4215 ext4_msg(sb, KERN_ERR, "write access "
4216 "unavailable, cannot proceed");
ac27a0ec
DK		 4217 return -EROFS;
4218 }
b31e1552
ES		 4219 ext4_msg(sb, KERN_INFO, "write access will "
4220 "be enabled during recovery");
ac27a0ec
DK		 4221 }
4222 }
4223
4224 if (journal_inum && journal_dev) {
b31e1552
ES		 4225 ext4_msg(sb, KERN_ERR, "filesystem has both journal "
4226 "and inode journals!");
ac27a0ec
DK		 4227 return -EINVAL;
4228 }
4229
4230 if (journal_inum) {
617ba13b 4231 if (!(journal = ext4_get_journal(sb, journal_inum)))
ac27a0ec
DK		 4232 return -EINVAL;
4233 } else {
617ba13b 4234 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
ac27a0ec
DK		 4235 return -EINVAL;
4236 }
4237
90576c0b 4238 if (!(journal->j_flags & JBD2_BARRIER))
b31e1552 4239 ext4_msg(sb, KERN_INFO, "barriers disabled");
4776004f 4240
e2b911c5 4241 if (!ext4_has_feature_journal_needs_recovery(sb))
dab291af 4242 err = jbd2_journal_wipe(journal, !really_read_only);
1c13d5c0
TT		 4243 if (!err) {
4244 char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL);
4245 if (save)
4246 memcpy(save, ((char *) es) +
4247 EXT4_S_ERR_START, EXT4_S_ERR_LEN);
dab291af 4248 err = jbd2_journal_load(journal);
1c13d5c0
TT		 4249 if (save)
4250 memcpy(((char *) es) + EXT4_S_ERR_START,
4251 save, EXT4_S_ERR_LEN);
4252 kfree(save);
4253 }
ac27a0ec
DK		 4254
4255 if (err) {
b31e1552 4256 ext4_msg(sb, KERN_ERR, "error loading journal");
dab291af 4257 jbd2_journal_destroy(journal);
ac27a0ec
DK		 4258 return err;
4259 }
4260
617ba13b
MC		 4261 EXT4_SB(sb)->s_journal = journal;
4262 ext4_clear_journal_err(sb, es);
ac27a0ec 4263
c41303ce 4264 if (!really_read_only && journal_devnum &&
ac27a0ec
DK		 4265 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
4266 es->s_journal_dev = cpu_to_le32(journal_devnum);
ac27a0ec
DK		 4267
4268 /* Make sure we flush the recovery flag to disk. */
e2d67052 4269 ext4_commit_super(sb, 1);
ac27a0ec
DK		 4270 }
4271
4272 return 0;
4273}
4274
e2d67052 4275static int ext4_commit_super(struct super_block *sb, int sync)
ac27a0ec 4276{
e2d67052 4277 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
617ba13b 4278 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
c4be0c1d 4279 int error = 0;
ac27a0ec 4280
bdfe0cbd 4281 if (!sbh || block_device_ejected(sb))
c4be0c1d 4282 return error;
914258bf
TT		 4283 if (buffer_write_io_error(sbh)) {
4284 /*
4285 * Oh, dear. A previous attempt to write the
4286 * superblock failed. This could happen because the
4287 * USB device was yanked out. Or it could happen to
4288 * be a transient write error and maybe the block will
4289 * be remapped. Nothing we can do but to retry the
4290 * write and hope for the best.
4291 */
b31e1552
ES		 4292 ext4_msg(sb, KERN_ERR, "previous I/O error to "
4293 "superblock detected");
914258bf
TT		 4294 clear_buffer_write_io_error(sbh);
4295 set_buffer_uptodate(sbh);
4296 }
71290b36
TT		 4297 /*
4298 * If the file system is mounted read-only, don't update the
4299 * superblock write time. This avoids updating the superblock
4300 * write time when we are mounting the root file system
4301 * read/only but we need to replay the journal; at that point,
4302 * for people who are east of GMT and who make their clock
4303 * tick in localtime for Windows bug-for-bug compatibility,
4304 * the clock is set in the future, and this will cause e2fsck
4305 * to complain and force a full file system check.
4306 */
4307 if (!(sb->s_flags & MS_RDONLY))
4308 es->s_wtime = cpu_to_le32(get_seconds());
f613dfcb
TT		 4309 if (sb->s_bdev->bd_part)
4310 es->s_kbytes_written =
4311 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written +
afc32f7e
TT		 4312 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
4313 EXT4_SB(sb)->s_sectors_written_start) >> 1));
f613dfcb
TT		 4314 else
4315 es->s_kbytes_written =
4316 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written);
d5e03cbb
TT		 4317 if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeclusters_counter))
4318 ext4_free_blocks_count_set(es,
57042651
TT		 4319 EXT4_C2B(EXT4_SB(sb), percpu_counter_sum_positive(
4320 &EXT4_SB(sb)->s_freeclusters_counter)));
d5e03cbb
TT		 4321 if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeinodes_counter))
4322 es->s_free_inodes_count =
4323 cpu_to_le32(percpu_counter_sum_positive(
ce7e010a 4324 &EXT4_SB(sb)->s_freeinodes_counter));
ac27a0ec 4325 BUFFER_TRACE(sbh, "marking dirty");
06db49e6 4326 ext4_superblock_csum_set(sb);
ac27a0ec 4327 mark_buffer_dirty(sbh);
914258bf 4328 if (sync) {
564bc402
DJ		 4329 error = __sync_dirty_buffer(sbh,
4330 test_opt(sb, BARRIER) ? WRITE_FUA : WRITE_SYNC);
c4be0c1d
TS		 4331 if (error)
4332 return error;
4333
4334 error = buffer_write_io_error(sbh);
4335 if (error) {
b31e1552
ES		 4336 ext4_msg(sb, KERN_ERR, "I/O error while writing "
4337 "superblock");
914258bf
TT		 4338 clear_buffer_write_io_error(sbh);
4339 set_buffer_uptodate(sbh);
4340 }
4341 }
c4be0c1d 4342 return error;
ac27a0ec
DK		 4343}
4344
ac27a0ec
DK		 4345/*
4346 * Have we just finished recovery? If so, and if we are mounting (or
4347 * remounting) the filesystem readonly, then we will end up with a
4348 * consistent fs on disk. Record that fact.
4349 */
2b2d6d01
TT		 4350static void ext4_mark_recovery_complete(struct super_block *sb,
4351 struct ext4_super_block *es)
ac27a0ec 4352{
617ba13b 4353 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 4354
e2b911c5 4355 if (!ext4_has_feature_journal(sb)) {
0390131b
FM		 4356 BUG_ON(journal != NULL);
4357 return;
4358 }
dab291af 4359 jbd2_journal_lock_updates(journal);
7ffe1ea8
HK		 4360 if (jbd2_journal_flush(journal) < 0)
4361 goto out;
4362
e2b911c5 4363 if (ext4_has_feature_journal_needs_recovery(sb) &&
ac27a0ec 4364 sb->s_flags & MS_RDONLY) {
e2b911c5 4365 ext4_clear_feature_journal_needs_recovery(sb);
e2d67052 4366 ext4_commit_super(sb, 1);
ac27a0ec 4367 }
7ffe1ea8
HK		 4368
4369out:
dab291af 4370 jbd2_journal_unlock_updates(journal);
ac27a0ec
DK		 4371}
4372
4373/*
4374 * If we are mounting (or read-write remounting) a filesystem whose journal
4375 * has recorded an error from a previous lifetime, move that error to the
4376 * main filesystem now.
4377 */
2b2d6d01
TT		 4378static void ext4_clear_journal_err(struct super_block *sb,
4379 struct ext4_super_block *es)
ac27a0ec
DK		 4380{
4381 journal_t *journal;
4382 int j_errno;
4383 const char *errstr;
4384
e2b911c5 4385 BUG_ON(!ext4_has_feature_journal(sb));
0390131b 4386
617ba13b 4387 journal = EXT4_SB(sb)->s_journal;
ac27a0ec
DK		 4388
4389 /*
4390 * Now check for any error status which may have been recorded in the
617ba13b 4391 * journal by a prior ext4_error() or ext4_abort()
ac27a0ec
DK		 4392 */
4393
dab291af 4394 j_errno = jbd2_journal_errno(journal);
ac27a0ec
DK		 4395 if (j_errno) {
4396 char nbuf[16];
4397
617ba13b 4398 errstr = ext4_decode_error(sb, j_errno, nbuf);
12062ddd 4399 ext4_warning(sb, "Filesystem error recorded "
ac27a0ec 4400 "from previous mount: %s", errstr);
12062ddd 4401 ext4_warning(sb, "Marking fs in need of filesystem check.");
ac27a0ec 4402
617ba13b
MC		 4403 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
4404 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
e2d67052 4405 ext4_commit_super(sb, 1);
ac27a0ec 4406
dab291af 4407 jbd2_journal_clear_err(journal);
d796c52e 4408 jbd2_journal_update_sb_errno(journal);
ac27a0ec
DK		 4409 }
4410}
4411
4412/*
4413 * Force the running and committing transactions to commit,
4414 * and wait on the commit.
4415 */
617ba13b 4416int ext4_force_commit(struct super_block *sb)
ac27a0ec
DK		 4417{
4418 journal_t *journal;
ac27a0ec
DK		 4419
4420 if (sb->s_flags & MS_RDONLY)
4421 return 0;
4422
617ba13b 4423 journal = EXT4_SB(sb)->s_journal;
b1deefc9 4424 return ext4_journal_force_commit(journal);
ac27a0ec
DK		 4425}
4426
617ba13b 4427static int ext4_sync_fs(struct super_block *sb, int wait)
ac27a0ec 4428{
14ce0cb4 4429 int ret = 0;
9eddacf9 4430 tid_t target;
06a407f1 4431 bool needs_barrier = false;
8d5d02e6 4432 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4433
9bffad1e 4434 trace_ext4_sync_fs(sb, wait);
2e8fa54e 4435 flush_workqueue(sbi->rsv_conversion_wq);
a1177825
JK		 4436 /*
4437 * Writeback quota in non-journalled quota case - journalled quota has
4438 * no dirty dquots
4439 */
4440 dquot_writeback_dquots(sb, -1);
06a407f1
DM		 4441 /*
4442 * Data writeback is possible w/o journal transaction, so barrier must
4443 * being sent at the end of the function. But we can skip it if
4444 * transaction_commit will do it for us.
4445 */
bda32530
TT		 4446 if (sbi->s_journal) {
4447 target = jbd2_get_latest_transaction(sbi->s_journal);
4448 if (wait && sbi->s_journal->j_flags & JBD2_BARRIER &&
4449 !jbd2_trans_will_send_data_barrier(sbi->s_journal, target))
4450 needs_barrier = true;
4451
4452 if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
4453 if (wait)
4454 ret = jbd2_log_wait_commit(sbi->s_journal,
4455 target);
4456 }
4457 } else if (wait && test_opt(sb, BARRIER))
06a407f1 4458 needs_barrier = true;
06a407f1
DM		 4459 if (needs_barrier) {
4460 int err;
4461 err = blkdev_issue_flush(sb->s_bdev, GFP_KERNEL, NULL);
4462 if (!ret)
4463 ret = err;
0390131b 4464 }
06a407f1
DM		 4465
4466 return ret;
4467}
4468
ac27a0ec
DK		 4469/*
4470 * LVM calls this function before a (read-only) snapshot is created. This
4471 * gives us a chance to flush the journal completely and mark the fs clean.
be4f27d3
YY		 4472 *
4473 * Note that only this function cannot bring a filesystem to be in a clean
8e8ad8a5
JK		 4474 * state independently. It relies on upper layer to stop all data & metadata
4475 * modifications.
ac27a0ec 4476 */
c4be0c1d 4477static int ext4_freeze(struct super_block *sb)
ac27a0ec 4478{
c4be0c1d
TS		 4479 int error = 0;
4480 journal_t *journal;
ac27a0ec 4481
9ca92389
TT		 4482 if (sb->s_flags & MS_RDONLY)
4483 return 0;
ac27a0ec 4484
9ca92389 4485 journal = EXT4_SB(sb)->s_journal;
7ffe1ea8 4486
bb044576
TT		 4487 if (journal) {
4488 /* Now we set up the journal barrier. */
4489 jbd2_journal_lock_updates(journal);
ac27a0ec 4490
bb044576
TT		 4491 /*
4492 * Don't clear the needs_recovery flag if we failed to
4493 * flush the journal.
4494 */
4495 error = jbd2_journal_flush(journal);
4496 if (error < 0)
4497 goto out;
c642dc9e
ES		 4498
4499 /* Journal blocked and flushed, clear needs_recovery flag. */
e2b911c5 4500 ext4_clear_feature_journal_needs_recovery(sb);
bb044576 4501 }
9ca92389 4502
9ca92389 4503 error = ext4_commit_super(sb, 1);
6b0310fb 4504out:
bb044576
TT		 4505 if (journal)
4506 /* we rely on upper layer to stop further updates */
4507 jbd2_journal_unlock_updates(journal);
6b0310fb 4508 return error;
ac27a0ec
DK		 4509}
4510
4511/*
4512 * Called by LVM after the snapshot is done. We need to reset the RECOVER
4513 * flag here, even though the filesystem is not technically dirty yet.
4514 */
c4be0c1d 4515static int ext4_unfreeze(struct super_block *sb)
ac27a0ec 4516{
9ca92389
TT		 4517 if (sb->s_flags & MS_RDONLY)
4518 return 0;
4519
c642dc9e
ES		 4520 if (EXT4_SB(sb)->s_journal) {
4521 /* Reset the needs_recovery flag before the fs is unlocked. */
e2b911c5 4522 ext4_set_feature_journal_needs_recovery(sb);
c642dc9e
ES		 4523 }
4524
9ca92389 4525 ext4_commit_super(sb, 1);
c4be0c1d 4526 return 0;
ac27a0ec
DK		 4527}
4528
673c6100
TT		 4529/*
4530 * Structure to save mount options for ext4_remount's benefit
4531 */
4532struct ext4_mount_options {
4533 unsigned long s_mount_opt;
a2595b8a 4534 unsigned long s_mount_opt2;
08cefc7a
EB		 4535 kuid_t s_resuid;
4536 kgid_t s_resgid;
673c6100
TT		 4537 unsigned long s_commit_interval;
4538 u32 s_min_batch_time, s_max_batch_time;
4539#ifdef CONFIG_QUOTA
4540 int s_jquota_fmt;
a2d4a646 4541 char *s_qf_names[EXT4_MAXQUOTAS];
673c6100
TT		 4542#endif
4543};
4544
2b2d6d01 4545static int ext4_remount(struct super_block *sb, int *flags, char *data)
ac27a0ec 4546{
2b2d6d01 4547 struct ext4_super_block *es;
617ba13b 4548 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4549 unsigned long old_sb_flags;
617ba13b 4550 struct ext4_mount_options old_opts;
c79d967d 4551 int enable_quota = 0;
8a266467 4552 ext4_group_t g;
b3881f74 4553 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
c5e06d10 4554 int err = 0;
ac27a0ec 4555#ifdef CONFIG_QUOTA
03dafb5f 4556 int i, j;
ac27a0ec 4557#endif
d4c402d9 4558 char *orig_data = kstrdup(data, GFP_KERNEL);
ac27a0ec
DK		 4559
4560 /* Store the original options */
4561 old_sb_flags = sb->s_flags;
4562 old_opts.s_mount_opt = sbi->s_mount_opt;
a2595b8a 4563 old_opts.s_mount_opt2 = sbi->s_mount_opt2;
ac27a0ec
DK		 4564 old_opts.s_resuid = sbi->s_resuid;
4565 old_opts.s_resgid = sbi->s_resgid;
4566 old_opts.s_commit_interval = sbi->s_commit_interval;
30773840
TT		 4567 old_opts.s_min_batch_time = sbi->s_min_batch_time;
4568 old_opts.s_max_batch_time = sbi->s_max_batch_time;
ac27a0ec
DK		 4569#ifdef CONFIG_QUOTA
4570 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
a2d4a646 4571 for (i = 0; i < EXT4_MAXQUOTAS; i++)
03dafb5f
CG		 4572 if (sbi->s_qf_names[i]) {
4573 old_opts.s_qf_names[i] = kstrdup(sbi->s_qf_names[i],
4574 GFP_KERNEL);
4575 if (!old_opts.s_qf_names[i]) {
4576 for (j = 0; j < i; j++)
4577 kfree(old_opts.s_qf_names[j]);
3e36a163 4578 kfree(orig_data);
03dafb5f
CG		 4579 return -ENOMEM;
4580 }
4581 } else
4582 old_opts.s_qf_names[i] = NULL;
ac27a0ec 4583#endif
b3881f74
TT		 4584 if (sbi->s_journal && sbi->s_journal->j_task->io_context)
4585 journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
ac27a0ec 4586
661aa520 4587 if (!parse_options(data, sb, NULL, &journal_ioprio, 1)) {
ac27a0ec
DK		 4588 err = -EINVAL;
4589 goto restore_opts;
4590 }
4591
6b992ff2 4592 if ((old_opts.s_mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) ^
c6d3d56d
DW		 4593 test_opt(sb, JOURNAL_CHECKSUM)) {
4594 ext4_msg(sb, KERN_ERR, "changing journal_checksum "
2d5b86e0
ES		 4595 "during remount not supported; ignoring");
4596 sbi->s_mount_opt ^= EXT4_MOUNT_JOURNAL_CHECKSUM;
6b992ff2
DW		 4597 }
4598
6ae6514b
PS		 4599 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
4600 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
4601 ext4_msg(sb, KERN_ERR, "can't mount with "
4602 "both data=journal and delalloc");
4603 err = -EINVAL;
4604 goto restore_opts;
4605 }
4606 if (test_opt(sb, DIOREAD_NOLOCK)) {
4607 ext4_msg(sb, KERN_ERR, "can't mount with "
4608 "both data=journal and dioread_nolock");
4609 err = -EINVAL;
4610 goto restore_opts;
4611 }
923ae0ff
RZ		 4612 if (test_opt(sb, DAX)) {
4613 ext4_msg(sb, KERN_ERR, "can't mount with "
4614 "both data=journal and dax");
4615 err = -EINVAL;
4616 goto restore_opts;
4617 }
4618 }
4619
4620 if ((sbi->s_mount_opt ^ old_opts.s_mount_opt) & EXT4_MOUNT_DAX) {
4621 ext4_msg(sb, KERN_WARNING, "warning: refusing change of "
4622 "dax flag with busy inodes while remounting");
4623 sbi->s_mount_opt ^= EXT4_MOUNT_DAX;
6ae6514b
PS		 4624 }
4625
4ab2f15b 4626 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
c67d859e 4627 ext4_abort(sb, "Abort forced by user");
ac27a0ec
DK		 4628
4629 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
482a7425 4630 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec
DK		 4631
4632 es = sbi->s_es;
4633
b3881f74 4634 if (sbi->s_journal) {
0390131b 4635 ext4_init_journal_params(sb, sbi->s_journal);
b3881f74
TT		 4636 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
4637 }
ac27a0ec 4638
a2fd66d0
TT		 4639 if (*flags & MS_LAZYTIME)
4640 sb->s_flags |= MS_LAZYTIME;
4641
661aa520 4642 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
4ab2f15b 4643 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) {
ac27a0ec
DK		 4644 err = -EROFS;
4645 goto restore_opts;
4646 }
4647
4648 if (*flags & MS_RDONLY) {
38c03b34
TT		 4649 err = sync_filesystem(sb);
4650 if (err < 0)
4651 goto restore_opts;
0f0dd62f
CH		 4652 err = dquot_suspend(sb, -1);
4653 if (err < 0)
c79d967d 4654 goto restore_opts;
c79d967d 4655
ac27a0ec
DK		 4656 /*
4657 * First of all, the unconditional stuff we have to do
4658 * to disable replay of the journal when we next remount
4659 */
4660 sb->s_flags |= MS_RDONLY;
4661
4662 /*
4663 * OK, test if we are remounting a valid rw partition
4664 * readonly, and if so set the rdonly flag and then
4665 * mark the partition as valid again.
4666 */
617ba13b
MC		 4667 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
4668 (sbi->s_mount_state & EXT4_VALID_FS))
ac27a0ec
DK		 4669 es->s_state = cpu_to_le16(sbi->s_mount_state);
4670
a63c9eb2 4671 if (sbi->s_journal)
0390131b 4672 ext4_mark_recovery_complete(sb, es);
ac27a0ec 4673 } else {
a13fb1a4 4674 /* Make sure we can mount this feature set readwrite */
e2b911c5 4675 if (ext4_has_feature_readonly(sb) ||
2cb5cc8b 4676 !ext4_feature_set_ok(sb, 0)) {
ac27a0ec
DK		 4677 err = -EROFS;
4678 goto restore_opts;
4679 }
8a266467
TT		 4680 /*
4681 * Make sure the group descriptor checksums
0b8e58a1 4682 * are sane. If they aren't, refuse to remount r/w.
8a266467
TT		 4683 */
4684 for (g = 0; g < sbi->s_groups_count; g++) {
4685 struct ext4_group_desc *gdp =
4686 ext4_get_group_desc(sb, g, NULL);
4687
feb0ab32 4688 if (!ext4_group_desc_csum_verify(sb, g, gdp)) {
b31e1552
ES		 4689 ext4_msg(sb, KERN_ERR,
4690 "ext4_remount: Checksum for group %u failed (%u!=%u)",
e2b911c5 4691 g, le16_to_cpu(ext4_group_desc_csum(sb, g, gdp)),
8a266467 4692 le16_to_cpu(gdp->bg_checksum));
6a797d27 4693 err = -EFSBADCRC;
8a266467
TT		 4694 goto restore_opts;
4695 }
4696 }
4697
ead6596b
ES		 4698 /*
4699 * If we have an unprocessed orphan list hanging
4700 * around from a previously readonly bdev mount,
4701 * require a full umount/remount for now.
4702 */
4703 if (es->s_last_orphan) {
b31e1552 4704 ext4_msg(sb, KERN_WARNING, "Couldn't "
ead6596b
ES		 4705 "remount RDWR because of unprocessed "
4706 "orphan inode list. Please "
b31e1552 4707 "umount/remount instead");
ead6596b
ES		 4708 err = -EINVAL;
4709 goto restore_opts;
4710 }
4711
ac27a0ec
DK		 4712 /*
4713 * Mounting a RDONLY partition read-write, so reread
4714 * and store the current valid flag. (It may have
4715 * been changed by e2fsck since we originally mounted
4716 * the partition.)
4717 */
0390131b
FM		 4718 if (sbi->s_journal)
4719 ext4_clear_journal_err(sb, es);
ac27a0ec 4720 sbi->s_mount_state = le16_to_cpu(es->s_state);
2b2d6d01 4721 if (!ext4_setup_super(sb, es, 0))
ac27a0ec 4722 sb->s_flags &= ~MS_RDONLY;
e2b911c5 4723 if (ext4_has_feature_mmp(sb))
c5e06d10
JL		 4724 if (ext4_multi_mount_protect(sb,
4725 le64_to_cpu(es->s_mmp_block))) {
4726 err = -EROFS;
4727 goto restore_opts;
4728 }
c79d967d 4729 enable_quota = 1;
ac27a0ec
DK		 4730 }
4731 }
bfff6873
LC		 4732
4733 /*
4734 * Reinitialize lazy itable initialization thread based on
4735 * current settings
4736 */
4737 if ((sb->s_flags & MS_RDONLY) || !test_opt(sb, INIT_INODE_TABLE))
4738 ext4_unregister_li_request(sb);
4739 else {
4740 ext4_group_t first_not_zeroed;
4741 first_not_zeroed = ext4_has_uninit_itable(sb);
4742 ext4_register_li_request(sb, first_not_zeroed);
4743 }
4744
6fd058f7 4745 ext4_setup_system_zone(sb);
d096ad0f 4746 if (sbi->s_journal == NULL && !(old_sb_flags & MS_RDONLY))
e2d67052 4747 ext4_commit_super(sb, 1);
0390131b 4748
ac27a0ec
DK		 4749#ifdef CONFIG_QUOTA
4750 /* Release old quota file names */
a2d4a646 4751 for (i = 0; i < EXT4_MAXQUOTAS; i++)
03dafb5f 4752 kfree(old_opts.s_qf_names[i]);
7c319d32
AK		 4753 if (enable_quota) {
4754 if (sb_any_quota_suspended(sb))
4755 dquot_resume(sb, -1);
e2b911c5 4756 else if (ext4_has_feature_quota(sb)) {
7c319d32 4757 err = ext4_enable_quotas(sb);
07724f98 4758 if (err)
7c319d32 4759 goto restore_opts;
7c319d32
AK		 4760 }
4761 }
ac27a0ec 4762#endif
d4c402d9 4763
a26f4992 4764 *flags = (*flags & ~MS_LAZYTIME) | (sb->s_flags & MS_LAZYTIME);
d4c402d9
CW		 4765 ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s", orig_data);
4766 kfree(orig_data);
ac27a0ec 4767 return 0;
0b8e58a1 4768
ac27a0ec
DK		 4769restore_opts:
4770 sb->s_flags = old_sb_flags;
4771 sbi->s_mount_opt = old_opts.s_mount_opt;
a2595b8a 4772 sbi->s_mount_opt2 = old_opts.s_mount_opt2;
ac27a0ec
DK		 4773 sbi->s_resuid = old_opts.s_resuid;
4774 sbi->s_resgid = old_opts.s_resgid;
4775 sbi->s_commit_interval = old_opts.s_commit_interval;
30773840
TT		 4776 sbi->s_min_batch_time = old_opts.s_min_batch_time;
4777 sbi->s_max_batch_time = old_opts.s_max_batch_time;
ac27a0ec
DK		 4778#ifdef CONFIG_QUOTA
4779 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
a2d4a646 4780 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
03dafb5f 4781 kfree(sbi->s_qf_names[i]);
ac27a0ec
DK		 4782 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
4783 }
4784#endif
d4c402d9 4785 kfree(orig_data);
ac27a0ec
DK		 4786 return err;
4787}
4788
2b2d6d01 4789static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
ac27a0ec
DK		 4790{
4791 struct super_block *sb = dentry->d_sb;
617ba13b
MC		 4792 struct ext4_sb_info *sbi = EXT4_SB(sb);
4793 struct ext4_super_block *es = sbi->s_es;
27dd4385 4794 ext4_fsblk_t overhead = 0, resv_blocks;
960cc398 4795 u64 fsid;
d02a9391 4796 s64 bfree;
27dd4385 4797 resv_blocks = EXT4_C2B(sbi, atomic64_read(&sbi->s_resv_clusters));
ac27a0ec 4798
952fc18e
TT		 4799 if (!test_opt(sb, MINIX_DF))
4800 overhead = sbi->s_overhead;
ac27a0ec 4801
617ba13b 4802 buf->f_type = EXT4_SUPER_MAGIC;
ac27a0ec 4803 buf->f_bsize = sb->s_blocksize;
b72f78cb 4804 buf->f_blocks = ext4_blocks_count(es) - EXT4_C2B(sbi, overhead);
57042651
TT		 4805 bfree = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) -
4806 percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter);
d02a9391 4807 /* prevent underflow in case that few free space is available */
57042651 4808 buf->f_bfree = EXT4_C2B(sbi, max_t(s64, bfree, 0));
27dd4385
LC		 4809 buf->f_bavail = buf->f_bfree -
4810 (ext4_r_blocks_count(es) + resv_blocks);
4811 if (buf->f_bfree < (ext4_r_blocks_count(es) + resv_blocks))
ac27a0ec
DK		 4812 buf->f_bavail = 0;
4813 buf->f_files = le32_to_cpu(es->s_inodes_count);
52d9f3b4 4814 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
617ba13b 4815 buf->f_namelen = EXT4_NAME_LEN;
960cc398
PE		 4816 fsid = le64_to_cpup((void *)es->s_uuid) ^
4817 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
4818 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
4819 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
0b8e58a1 4820
ac27a0ec
DK		 4821 return 0;
4822}
4823
0b8e58a1
AD		 4824/* Helper function for writing quotas on sync - we need to start transaction
4825 * before quota file is locked for write. Otherwise the are possible deadlocks:
ac27a0ec 4826 * Process 1 Process 2
617ba13b 4827 * ext4_create() quota_sync()
a269eb18 4828 * jbd2_journal_start() write_dquot()
871a2931 4829 * dquot_initialize() down(dqio_mutex)
dab291af 4830 * down(dqio_mutex) jbd2_journal_start()
ac27a0ec
DK		 4831 *
4832 */
4833
4834#ifdef CONFIG_QUOTA
4835
4836static inline struct inode *dquot_to_inode(struct dquot *dquot)
4837{
4c376dca 4838 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_id.type];
ac27a0ec
DK		 4839}
4840
617ba13b 4841static int ext4_write_dquot(struct dquot *dquot)
ac27a0ec
DK		 4842{
4843 int ret, err;
4844 handle_t *handle;
4845 struct inode *inode;
4846
4847 inode = dquot_to_inode(dquot);
9924a92a 4848 handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
0b8e58a1 4849 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 4850 if (IS_ERR(handle))
4851 return PTR_ERR(handle);
4852 ret = dquot_commit(dquot);
617ba13b 4853 err = ext4_journal_stop(handle);
ac27a0ec
DK		 4854 if (!ret)
4855 ret = err;
4856 return ret;
4857}
4858
617ba13b 4859static int ext4_acquire_dquot(struct dquot *dquot)
ac27a0ec
DK		 4860{
4861 int ret, err;
4862 handle_t *handle;
4863
9924a92a 4864 handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
0b8e58a1 4865 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 4866 if (IS_ERR(handle))
4867 return PTR_ERR(handle);
4868 ret = dquot_acquire(dquot);
617ba13b 4869 err = ext4_journal_stop(handle);
ac27a0ec
DK		 4870 if (!ret)
4871 ret = err;
4872 return ret;
4873}
4874
617ba13b 4875static int ext4_release_dquot(struct dquot *dquot)
ac27a0ec
DK		 4876{
4877 int ret, err;
4878 handle_t *handle;
4879
9924a92a 4880 handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
0b8e58a1 4881 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
9c3013e9
JK		 4882 if (IS_ERR(handle)) {
4883 /* Release dquot anyway to avoid endless cycle in dqput() */
4884 dquot_release(dquot);
ac27a0ec 4885 return PTR_ERR(handle);
9c3013e9 4886 }
ac27a0ec 4887 ret = dquot_release(dquot);
617ba13b 4888 err = ext4_journal_stop(handle);
ac27a0ec
DK		 4889 if (!ret)
4890 ret = err;
4891 return ret;
4892}
4893
617ba13b 4894static int ext4_mark_dquot_dirty(struct dquot *dquot)
ac27a0ec 4895{
262b4662
JK		 4896 struct super_block *sb = dquot->dq_sb;
4897 struct ext4_sb_info *sbi = EXT4_SB(sb);
4898
2c8be6b2 4899 /* Are we journaling quotas? */
e2b911c5 4900 if (ext4_has_feature_quota(sb) ||
262b4662 4901 sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
ac27a0ec 4902 dquot_mark_dquot_dirty(dquot);
617ba13b 4903 return ext4_write_dquot(dquot);
ac27a0ec
DK		 4904 } else {
4905 return dquot_mark_dquot_dirty(dquot);
4906 }
4907}
4908
617ba13b 4909static int ext4_write_info(struct super_block *sb, int type)
ac27a0ec
DK		 4910{
4911 int ret, err;
4912 handle_t *handle;
4913
4914 /* Data block + inode block */
2b0143b5 4915 handle = ext4_journal_start(d_inode(sb->s_root), EXT4_HT_QUOTA, 2);
ac27a0ec
DK		 4916 if (IS_ERR(handle))
4917 return PTR_ERR(handle);
4918 ret = dquot_commit_info(sb, type);
617ba13b 4919 err = ext4_journal_stop(handle);
ac27a0ec
DK		 4920 if (!ret)
4921 ret = err;
4922 return ret;
4923}
4924
4925/*
4926 * Turn on quotas during mount time - we need to find
4927 * the quota file and such...
4928 */
617ba13b 4929static int ext4_quota_on_mount(struct super_block *sb, int type)
ac27a0ec 4930{
287a8095
CH		 4931 return dquot_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
4932 EXT4_SB(sb)->s_jquota_fmt, type);
ac27a0ec
DK		 4933}
4934
4935/*
4936 * Standard function to be called on quota_on
4937 */
617ba13b 4938static int ext4_quota_on(struct super_block *sb, int type, int format_id,
f00c9e44 4939 struct path *path)
ac27a0ec
DK		 4940{
4941 int err;
ac27a0ec
DK		 4942
4943 if (!test_opt(sb, QUOTA))
4944 return -EINVAL;
0623543b 4945
ac27a0ec 4946 /* Quotafile not on the same filesystem? */
d8c9584e 4947 if (path->dentry->d_sb != sb)
ac27a0ec 4948 return -EXDEV;
0623543b
JK		 4949 /* Journaling quota? */
4950 if (EXT4_SB(sb)->s_qf_names[type]) {
2b2d6d01 4951 /* Quotafile not in fs root? */
f00c9e44 4952 if (path->dentry->d_parent != sb->s_root)
b31e1552
ES		 4953 ext4_msg(sb, KERN_WARNING,
4954 "Quota file not on filesystem root. "
4955 "Journaled quota will not work");
2b2d6d01 4956 }
0623543b
JK		 4957
4958 /*
4959 * When we journal data on quota file, we have to flush journal to see
4960 * all updates to the file when we bypass pagecache...
4961 */
0390131b 4962 if (EXT4_SB(sb)->s_journal &&
2b0143b5 4963 ext4_should_journal_data(d_inode(path->dentry))) {
0623543b
JK		 4964 /*
4965 * We don't need to lock updates but journal_flush() could
4966 * otherwise be livelocked...
4967 */
4968 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
7ffe1ea8 4969 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
0623543b 4970 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
f00c9e44 4971 if (err)
7ffe1ea8 4972 return err;
0623543b
JK		 4973 }
4974
f00c9e44 4975 return dquot_quota_on(sb, type, format_id, path);
ac27a0ec
DK		 4976}
4977
7c319d32
AK		 4978static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
4979 unsigned int flags)
4980{
4981 int err;
4982 struct inode *qf_inode;
a2d4a646 4983 unsigned long qf_inums[EXT4_MAXQUOTAS] = {
7c319d32
AK		 4984 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
4985 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum)
4986 };
4987
e2b911c5 4988 BUG_ON(!ext4_has_feature_quota(sb));
7c319d32
AK		 4989
4990 if (!qf_inums[type])
4991 return -EPERM;
4992
4993 qf_inode = ext4_iget(sb, qf_inums[type]);
4994 if (IS_ERR(qf_inode)) {
4995 ext4_error(sb, "Bad quota inode # %lu", qf_inums[type]);
4996 return PTR_ERR(qf_inode);
4997 }
4998
bcb13850
JK		 4999 /* Don't account quota for quota files to avoid recursion */
5000 qf_inode->i_flags |= S_NOQUOTA;
7c319d32
AK		 5001 err = dquot_enable(qf_inode, type, format_id, flags);
5002 iput(qf_inode);
5003
5004 return err;
5005}
5006
5007/* Enable usage tracking for all quota types. */
5008static int ext4_enable_quotas(struct super_block *sb)
5009{
5010 int type, err = 0;
a2d4a646 5011 unsigned long qf_inums[EXT4_MAXQUOTAS] = {
7c319d32
AK		 5012 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
5013 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum)
5014 };
5015
5016 sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE;
a2d4a646 5017 for (type = 0; type < EXT4_MAXQUOTAS; type++) {
7c319d32
AK		 5018 if (qf_inums[type]) {
5019 err = ext4_quota_enable(sb, type, QFMT_VFS_V1,
5020 DQUOT_USAGE_ENABLED);
5021 if (err) {
5022 ext4_warning(sb,
72ba7450
TT		 5023 "Failed to enable quota tracking "
5024 "(type=%d, err=%d). Please run "
5025 "e2fsck to fix.", type, err);
7c319d32
AK		 5026 return err;
5027 }
5028 }
5029 }
5030 return 0;
5031}
5032
ca0e05e4
DM		 5033static int ext4_quota_off(struct super_block *sb, int type)
5034{
21f97697
JK		 5035 struct inode *inode = sb_dqopt(sb)->files[type];
5036 handle_t *handle;
5037
87009d86
DM		 5038 /* Force all delayed allocation blocks to be allocated.
5039 * Caller already holds s_umount sem */
5040 if (test_opt(sb, DELALLOC))
ca0e05e4 5041 sync_filesystem(sb);
ca0e05e4 5042
0b268590
AG		 5043 if (!inode)
5044 goto out;
5045
21f97697
JK		 5046 /* Update modification times of quota files when userspace can
5047 * start looking at them */
9924a92a 5048 handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1);
21f97697
JK		 5049 if (IS_ERR(handle))
5050 goto out;
5051 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
5052 ext4_mark_inode_dirty(handle, inode);
5053 ext4_journal_stop(handle);
5054
5055out:
ca0e05e4
DM		 5056 return dquot_quota_off(sb, type);
5057}
5058
ac27a0ec
DK		 5059/* Read data from quotafile - avoid pagecache and such because we cannot afford
5060 * acquiring the locks... As quota files are never truncated and quota code
25985edc 5061 * itself serializes the operations (and no one else should touch the files)
ac27a0ec 5062 * we don't have to be afraid of races */
617ba13b 5063static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec
DK		 5064 size_t len, loff_t off)
5065{
5066 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 5067 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 5068 int offset = off & (sb->s_blocksize - 1);
5069 int tocopy;
5070 size_t toread;
5071 struct buffer_head *bh;
5072 loff_t i_size = i_size_read(inode);
5073
5074 if (off > i_size)
5075 return 0;
5076 if (off+len > i_size)
5077 len = i_size-off;
5078 toread = len;
5079 while (toread > 0) {
5080 tocopy = sb->s_blocksize - offset < toread ?
5081 sb->s_blocksize - offset : toread;
1c215028
TT		 5082 bh = ext4_bread(NULL, inode, blk, 0);
5083 if (IS_ERR(bh))
5084 return PTR_ERR(bh);
ac27a0ec
DK		 5085 if (!bh) /* A hole? */
5086 memset(data, 0, tocopy);
5087 else
5088 memcpy(data, bh->b_data+offset, tocopy);
5089 brelse(bh);
5090 offset = 0;
5091 toread -= tocopy;
5092 data += tocopy;
5093 blk++;
5094 }
5095 return len;
5096}
5097
5098/* Write to quotafile (we know the transaction is already started and has
5099 * enough credits) */
617ba13b 5100static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec
DK		 5101 const char *data, size_t len, loff_t off)
5102{
5103 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 5104 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
1c215028 5105 int err, offset = off & (sb->s_blocksize - 1);
c5e298ae 5106 int retries = 0;
ac27a0ec
DK		 5107 struct buffer_head *bh;
5108 handle_t *handle = journal_current_handle();
5109
0390131b 5110 if (EXT4_SB(sb)->s_journal && !handle) {
b31e1552
ES		 5111 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
5112 " cancelled because transaction is not started",
9c3013e9
JK		 5113 (unsigned long long)off, (unsigned long long)len);
5114 return -EIO;
5115 }
67eeb568
DM		 5116 /*
5117 * Since we account only one data block in transaction credits,
5118 * then it is impossible to cross a block boundary.
5119 */
5120 if (sb->s_blocksize - offset < len) {
5121 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
5122 " cancelled because not block aligned",
5123 (unsigned long long)off, (unsigned long long)len);
5124 return -EIO;
5125 }
5126
c5e298ae
TT		 5127 do {
5128 bh = ext4_bread(handle, inode, blk,
5129 EXT4_GET_BLOCKS_CREATE |
5130 EXT4_GET_BLOCKS_METADATA_NOFAIL);
5131 } while (IS_ERR(bh) && (PTR_ERR(bh) == -ENOSPC) &&
5132 ext4_should_retry_alloc(inode->i_sb, &retries));
1c215028
TT		 5133 if (IS_ERR(bh))
5134 return PTR_ERR(bh);
67eeb568
DM		 5135 if (!bh)
5136 goto out;
5d601255 5137 BUFFER_TRACE(bh, "get write access");
62d2b5f2
JK		 5138 err = ext4_journal_get_write_access(handle, bh);
5139 if (err) {
5140 brelse(bh);
1c215028 5141 return err;
ac27a0ec 5142 }
67eeb568
DM		 5143 lock_buffer(bh);
5144 memcpy(bh->b_data+offset, data, len);
5145 flush_dcache_page(bh->b_page);
5146 unlock_buffer(bh);
62d2b5f2 5147 err = ext4_handle_dirty_metadata(handle, NULL, bh);
67eeb568 5148 brelse(bh);
ac27a0ec 5149out:
67eeb568
DM		 5150 if (inode->i_size < off + len) {
5151 i_size_write(inode, off + len);
617ba13b 5152 EXT4_I(inode)->i_disksize = inode->i_size;
21f97697 5153 ext4_mark_inode_dirty(handle, inode);
ac27a0ec 5154 }
67eeb568 5155 return len;
ac27a0ec
DK		 5156}
5157
5158#endif
5159
152a0836
AV		 5160static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
5161 const char *dev_name, void *data)
ac27a0ec 5162{
152a0836 5163 return mount_bdev(fs_type, flags, dev_name, data, ext4_fill_super);
ac27a0ec
DK		 5164}
5165
c290ea01 5166#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2)
24b58424
TT		 5167static inline void register_as_ext2(void)
5168{
5169 int err = register_filesystem(&ext2_fs_type);
5170 if (err)
5171 printk(KERN_WARNING
5172 "EXT4-fs: Unable to register as ext2 (%d)\n", err);
5173}
5174
5175static inline void unregister_as_ext2(void)
5176{
5177 unregister_filesystem(&ext2_fs_type);
5178}
2035e776
TT		 5179
5180static inline int ext2_feature_set_ok(struct super_block *sb)
5181{
e2b911c5 5182 if (ext4_has_unknown_ext2_incompat_features(sb))
2035e776
TT		 5183 return 0;
5184 if (sb->s_flags & MS_RDONLY)
5185 return 1;
e2b911c5 5186 if (ext4_has_unknown_ext2_ro_compat_features(sb))
2035e776
TT		 5187 return 0;
5188 return 1;
5189}
24b58424
TT		 5190#else
5191static inline void register_as_ext2(void) { }
5192static inline void unregister_as_ext2(void) { }
2035e776 5193static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; }
24b58424
TT		 5194#endif
5195
24b58424
TT		 5196static inline void register_as_ext3(void)
5197{
5198 int err = register_filesystem(&ext3_fs_type);
5199 if (err)
5200 printk(KERN_WARNING
5201 "EXT4-fs: Unable to register as ext3 (%d)\n", err);
5202}
5203
5204static inline void unregister_as_ext3(void)
5205{
5206 unregister_filesystem(&ext3_fs_type);
5207}
2035e776
TT		 5208
5209static inline int ext3_feature_set_ok(struct super_block *sb)
5210{
e2b911c5 5211 if (ext4_has_unknown_ext3_incompat_features(sb))
2035e776 5212 return 0;
e2b911c5 5213 if (!ext4_has_feature_journal(sb))
2035e776
TT		 5214 return 0;
5215 if (sb->s_flags & MS_RDONLY)
5216 return 1;
e2b911c5 5217 if (ext4_has_unknown_ext3_ro_compat_features(sb))
2035e776
TT		 5218 return 0;
5219 return 1;
5220}
24b58424 5221
03010a33
TT		 5222static struct file_system_type ext4_fs_type = {
5223 .owner = THIS_MODULE,
5224 .name = "ext4",
152a0836 5225 .mount = ext4_mount,
03010a33
TT		 5226 .kill_sb = kill_block_super,
5227 .fs_flags = FS_REQUIRES_DEV,
5228};
7f78e035 5229MODULE_ALIAS_FS("ext4");
03010a33 5230
e9e3bcec
ES		 5231/* Shared across all ext4 file systems */
5232wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
5233struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ];
5234
5dabfc78 5235static int __init ext4_init_fs(void)
ac27a0ec 5236{
e9e3bcec 5237 int i, err;
c9de560d 5238
e294a537 5239 ratelimit_state_init(&ext4_mount_msg_ratelimit, 30 * HZ, 64);
07c0c5d8
AV		 5240 ext4_li_info = NULL;
5241 mutex_init(&ext4_li_mtx);
5242
9a4c8019 5243 /* Build-time check for flags consistency */
12e9b892 5244 ext4_check_flag_values();
e9e3bcec
ES		 5245
5246 for (i = 0; i < EXT4_WQ_HASH_SZ; i++) {
5247 mutex_init(&ext4__aio_mutex[i]);
5248 init_waitqueue_head(&ext4__ioend_wq[i]);
5249 }
5250
51865fda 5251 err = ext4_init_es();
6fd058f7
TT		 5252 if (err)
5253 return err;
51865fda
ZL		 5254
5255 err = ext4_init_pageio();
5256 if (err)
b5799018 5257 goto out5;
51865fda 5258
5dabfc78 5259 err = ext4_init_system_zone();
bd2d0210 5260 if (err)
b5799018 5261 goto out4;
857ac889 5262
b5799018 5263 err = ext4_init_sysfs();
dd68314c 5264 if (err)
b5799018 5265 goto out3;
857ac889 5266
5dabfc78 5267 err = ext4_init_mballoc();
c9de560d
AT		 5268 if (err)
5269 goto out2;
9c191f70
M		 5270 else
5271 ext4_mballoc_ready = 1;
ac27a0ec
DK		 5272 err = init_inodecache();
5273 if (err)
5274 goto out1;
24b58424 5275 register_as_ext3();
2035e776 5276 register_as_ext2();
03010a33 5277 err = register_filesystem(&ext4_fs_type);
ac27a0ec
DK		 5278 if (err)
5279 goto out;
bfff6873 5280
ac27a0ec
DK		 5281 return 0;
5282out:
24b58424
TT		 5283 unregister_as_ext2();
5284 unregister_as_ext3();
ac27a0ec
DK		 5285 destroy_inodecache();
5286out1:
9c191f70 5287 ext4_mballoc_ready = 0;
5dabfc78 5288 ext4_exit_mballoc();
9c191f70 5289out2:
b5799018
TT		 5290 ext4_exit_sysfs();
5291out3:
5dabfc78 5292 ext4_exit_system_zone();
b5799018 5293out4:
5dabfc78 5294 ext4_exit_pageio();
b5799018 5295out5:
51865fda
ZL		 5296 ext4_exit_es();
5297
ac27a0ec
DK		 5298 return err;
5299}
5300
5dabfc78 5301static void __exit ext4_exit_fs(void)
ac27a0ec 5302{
e298e73b 5303 ext4_exit_crypto();
bfff6873 5304 ext4_destroy_lazyinit_thread();
24b58424
TT		 5305 unregister_as_ext2();
5306 unregister_as_ext3();
03010a33 5307 unregister_filesystem(&ext4_fs_type);
ac27a0ec 5308 destroy_inodecache();
5dabfc78 5309 ext4_exit_mballoc();
b5799018 5310 ext4_exit_sysfs();
5dabfc78
TT		 5311 ext4_exit_system_zone();
5312 ext4_exit_pageio();
dd12ed14 5313 ext4_exit_es();
ac27a0ec
DK		 5314}
5315
5316MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
83982b6f 5317MODULE_DESCRIPTION("Fourth Extended Filesystem");
ac27a0ec 5318MODULE_LICENSE("GPL");
5dabfc78
TT		 5319module_init(ext4_init_fs)
5320module_exit(ext4_exit_fs)
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