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ext4: fix races of writeback with punch hole and zero range
[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);
ea3d7209 961 init_rwsem(&ei->i_mmap_sem);
a35afb83 962 inode_init_once(&ei->vfs_inode);
ac27a0ec
DK		 963}
964
e67bc2b3 965static int __init init_inodecache(void)
ac27a0ec 966{
617ba13b
MC		 967 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
968 sizeof(struct ext4_inode_info),
ac27a0ec
DK		 969 0, (SLAB_RECLAIM_ACCOUNT|
970 SLAB_MEM_SPREAD),
20c2df83 971 init_once);
617ba13b 972 if (ext4_inode_cachep == NULL)
ac27a0ec
DK		 973 return -ENOMEM;
974 return 0;
975}
976
977static void destroy_inodecache(void)
978{
8c0a8537
KS		 979 /*
980 * Make sure all delayed rcu free inodes are flushed before we
981 * destroy cache.
982 */
983 rcu_barrier();
617ba13b 984 kmem_cache_destroy(ext4_inode_cachep);
ac27a0ec
DK		 985}
986
0930fcc1 987void ext4_clear_inode(struct inode *inode)
ac27a0ec 988{
0930fcc1 989 invalidate_inode_buffers(inode);
dbd5768f 990 clear_inode(inode);
9f754758 991 dquot_drop(inode);
c2ea3fde 992 ext4_discard_preallocations(inode);
51865fda 993 ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS);
8aefcd55
TT		 994 if (EXT4_I(inode)->jinode) {
995 jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode),
996 EXT4_I(inode)->jinode);
997 jbd2_free_inode(EXT4_I(inode)->jinode);
998 EXT4_I(inode)->jinode = NULL;
999 }
b7236e21
TT		 1000#ifdef CONFIG_EXT4_FS_ENCRYPTION
1001 if (EXT4_I(inode)->i_crypt_info)
c936e1ec 1002 ext4_free_encryption_info(inode, EXT4_I(inode)->i_crypt_info);
b7236e21 1003#endif
ac27a0ec
DK		 1004}
1005
1b961ac0 1006static struct inode *ext4_nfs_get_inode(struct super_block *sb,
0b8e58a1 1007 u64 ino, u32 generation)
ac27a0ec 1008{
ac27a0ec 1009 struct inode *inode;
ac27a0ec 1010
617ba13b 1011 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
ac27a0ec 1012 return ERR_PTR(-ESTALE);
617ba13b 1013 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
ac27a0ec
DK		 1014 return ERR_PTR(-ESTALE);
1015
1016 /* iget isn't really right if the inode is currently unallocated!!
1017 *
617ba13b 1018 * ext4_read_inode will return a bad_inode if the inode had been
ac27a0ec
DK		 1019 * deleted, so we should be safe.
1020 *
1021 * Currently we don't know the generation for parent directory, so
1022 * a generation of 0 means "accept any"
1023 */
f4bb2981 1024 inode = ext4_iget_normal(sb, ino);
1d1fe1ee
DH		 1025 if (IS_ERR(inode))
1026 return ERR_CAST(inode);
1027 if (generation && inode->i_generation != generation) {
ac27a0ec
DK		 1028 iput(inode);
1029 return ERR_PTR(-ESTALE);
1030 }
1b961ac0
CH		 1031
1032 return inode;
1033}
1034
1035static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
0b8e58a1 1036 int fh_len, int fh_type)
1b961ac0
CH		 1037{
1038 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
1039 ext4_nfs_get_inode);
1040}
1041
1042static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
0b8e58a1 1043 int fh_len, int fh_type)
1b961ac0
CH		 1044{
1045 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
1046 ext4_nfs_get_inode);
ac27a0ec
DK		 1047}
1048
c39a7f84
TO		 1049/*
1050 * Try to release metadata pages (indirect blocks, directories) which are
1051 * mapped via the block device. Since these pages could have journal heads
1052 * which would prevent try_to_free_buffers() from freeing them, we must use
1053 * jbd2 layer's try_to_free_buffers() function to release them.
1054 */
0b8e58a1
AD		 1055static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
1056 gfp_t wait)
c39a7f84
TO		 1057{
1058 journal_t *journal = EXT4_SB(sb)->s_journal;
1059
1060 WARN_ON(PageChecked(page));
1061 if (!page_has_buffers(page))
1062 return 0;
1063 if (journal)
1064 return jbd2_journal_try_to_free_buffers(journal, page,
d0164adc 1065 wait & ~__GFP_DIRECT_RECLAIM);
c39a7f84
TO		 1066 return try_to_free_buffers(page);
1067}
1068
ac27a0ec 1069#ifdef CONFIG_QUOTA
af5bc92d 1070#define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
2b2d6d01 1071#define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
ac27a0ec 1072
617ba13b
MC		 1073static int ext4_write_dquot(struct dquot *dquot);
1074static int ext4_acquire_dquot(struct dquot *dquot);
1075static int ext4_release_dquot(struct dquot *dquot);
1076static int ext4_mark_dquot_dirty(struct dquot *dquot);
1077static int ext4_write_info(struct super_block *sb, int type);
6f28e087 1078static int ext4_quota_on(struct super_block *sb, int type, int format_id,
f00c9e44 1079 struct path *path);
ca0e05e4 1080static int ext4_quota_off(struct super_block *sb, int type);
617ba13b
MC		 1081static int ext4_quota_on_mount(struct super_block *sb, int type);
1082static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec 1083 size_t len, loff_t off);
617ba13b 1084static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec 1085 const char *data, size_t len, loff_t off);
7c319d32
AK		 1086static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
1087 unsigned int flags);
1088static int ext4_enable_quotas(struct super_block *sb);
ac27a0ec 1089
96c7e0d9
JK		 1090static struct dquot **ext4_get_dquots(struct inode *inode)
1091{
1092 return EXT4_I(inode)->i_dquot;
1093}
1094
61e225dc 1095static const struct dquot_operations ext4_quota_operations = {
60e58e0f 1096 .get_reserved_space = ext4_get_reserved_space,
617ba13b
MC		 1097 .write_dquot = ext4_write_dquot,
1098 .acquire_dquot = ext4_acquire_dquot,
1099 .release_dquot = ext4_release_dquot,
1100 .mark_dirty = ext4_mark_dquot_dirty,
a5b5ee32
JK		 1101 .write_info = ext4_write_info,
1102 .alloc_dquot = dquot_alloc,
1103 .destroy_dquot = dquot_destroy,
ac27a0ec
DK		 1104};
1105
0d54b217 1106static const struct quotactl_ops ext4_qctl_operations = {
617ba13b 1107 .quota_on = ext4_quota_on,
ca0e05e4 1108 .quota_off = ext4_quota_off,
287a8095 1109 .quota_sync = dquot_quota_sync,
0a240339 1110 .get_state = dquot_get_state,
287a8095
CH		 1111 .set_info = dquot_set_dqinfo,
1112 .get_dqblk = dquot_get_dqblk,
1113 .set_dqblk = dquot_set_dqblk
ac27a0ec
DK		 1114};
1115#endif
1116
ee9b6d61 1117static const struct super_operations ext4_sops = {
617ba13b
MC		 1118 .alloc_inode = ext4_alloc_inode,
1119 .destroy_inode = ext4_destroy_inode,
617ba13b
MC		 1120 .write_inode = ext4_write_inode,
1121 .dirty_inode = ext4_dirty_inode,
7ff9c073 1122 .drop_inode = ext4_drop_inode,
0930fcc1 1123 .evict_inode = ext4_evict_inode,
617ba13b 1124 .put_super = ext4_put_super,
617ba13b 1125 .sync_fs = ext4_sync_fs,
c4be0c1d
TS		 1126 .freeze_fs = ext4_freeze,
1127 .unfreeze_fs = ext4_unfreeze,
617ba13b
MC		 1128 .statfs = ext4_statfs,
1129 .remount_fs = ext4_remount,
617ba13b 1130 .show_options = ext4_show_options,
ac27a0ec 1131#ifdef CONFIG_QUOTA
617ba13b
MC		 1132 .quota_read = ext4_quota_read,
1133 .quota_write = ext4_quota_write,
96c7e0d9 1134 .get_dquots = ext4_get_dquots,
ac27a0ec 1135#endif
c39a7f84 1136 .bdev_try_to_free_page = bdev_try_to_free_page,
ac27a0ec
DK		 1137};
1138
39655164 1139static const struct export_operations ext4_export_ops = {
1b961ac0
CH		 1140 .fh_to_dentry = ext4_fh_to_dentry,
1141 .fh_to_parent = ext4_fh_to_parent,
617ba13b 1142 .get_parent = ext4_get_parent,
ac27a0ec
DK		 1143};
1144
1145enum {
1146 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
1147 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
72578c33 1148 Opt_nouid32, Opt_debug, Opt_removed,
ac27a0ec 1149 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
72578c33 1150 Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload,
ad4eec61
ES		 1151 Opt_commit, Opt_min_batch_time, Opt_max_batch_time, Opt_journal_dev,
1152 Opt_journal_path, Opt_journal_checksum, Opt_journal_async_commit,
ac27a0ec 1153 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
6ddb2447 1154 Opt_data_err_abort, Opt_data_err_ignore, Opt_test_dummy_encryption,
ac27a0ec 1155 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
5a20bdfc 1156 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
ee4a3fcd 1157 Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err,
923ae0ff 1158 Opt_usrquota, Opt_grpquota, Opt_i_version, Opt_dax,
1449032b 1159 Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_mblk_io_submit,
a26f4992 1160 Opt_lazytime, Opt_nolazytime,
1449032b 1161 Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity,
5328e635 1162 Opt_inode_readahead_blks, Opt_journal_ioprio,
744692dc 1163 Opt_dioread_nolock, Opt_dioread_lock,
fc6cb1cd 1164 Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable,
c6d3d56d 1165 Opt_max_dir_size_kb, Opt_nojournal_checksum,
ac27a0ec
DK		 1166};
1167
a447c093 1168static const match_table_t tokens = {
ac27a0ec
DK		 1169 {Opt_bsd_df, "bsddf"},
1170 {Opt_minix_df, "minixdf"},
1171 {Opt_grpid, "grpid"},
1172 {Opt_grpid, "bsdgroups"},
1173 {Opt_nogrpid, "nogrpid"},
1174 {Opt_nogrpid, "sysvgroups"},
1175 {Opt_resgid, "resgid=%u"},
1176 {Opt_resuid, "resuid=%u"},
1177 {Opt_sb, "sb=%u"},
1178 {Opt_err_cont, "errors=continue"},
1179 {Opt_err_panic, "errors=panic"},
1180 {Opt_err_ro, "errors=remount-ro"},
1181 {Opt_nouid32, "nouid32"},
ac27a0ec 1182 {Opt_debug, "debug"},
72578c33
TT		 1183 {Opt_removed, "oldalloc"},
1184 {Opt_removed, "orlov"},
ac27a0ec
DK		 1185 {Opt_user_xattr, "user_xattr"},
1186 {Opt_nouser_xattr, "nouser_xattr"},
1187 {Opt_acl, "acl"},
1188 {Opt_noacl, "noacl"},
e3bb52ae 1189 {Opt_noload, "norecovery"},
5a916be1 1190 {Opt_noload, "noload"},
72578c33
TT		 1191 {Opt_removed, "nobh"},
1192 {Opt_removed, "bh"},
ac27a0ec 1193 {Opt_commit, "commit=%u"},
30773840
TT		 1194 {Opt_min_batch_time, "min_batch_time=%u"},
1195 {Opt_max_batch_time, "max_batch_time=%u"},
ac27a0ec 1196 {Opt_journal_dev, "journal_dev=%u"},
ad4eec61 1197 {Opt_journal_path, "journal_path=%s"},
818d276c 1198 {Opt_journal_checksum, "journal_checksum"},
c6d3d56d 1199 {Opt_nojournal_checksum, "nojournal_checksum"},
818d276c 1200 {Opt_journal_async_commit, "journal_async_commit"},
ac27a0ec
DK		 1201 {Opt_abort, "abort"},
1202 {Opt_data_journal, "data=journal"},
1203 {Opt_data_ordered, "data=ordered"},
1204 {Opt_data_writeback, "data=writeback"},
5bf5683a
HK		 1205 {Opt_data_err_abort, "data_err=abort"},
1206 {Opt_data_err_ignore, "data_err=ignore"},
ac27a0ec
DK		 1207 {Opt_offusrjquota, "usrjquota="},
1208 {Opt_usrjquota, "usrjquota=%s"},
1209 {Opt_offgrpjquota, "grpjquota="},
1210 {Opt_grpjquota, "grpjquota=%s"},
1211 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
1212 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
5a20bdfc 1213 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
ac27a0ec
DK		 1214 {Opt_grpquota, "grpquota"},
1215 {Opt_noquota, "noquota"},
1216 {Opt_quota, "quota"},
1217 {Opt_usrquota, "usrquota"},
1218 {Opt_barrier, "barrier=%u"},
06705bff
TT		 1219 {Opt_barrier, "barrier"},
1220 {Opt_nobarrier, "nobarrier"},
25ec56b5 1221 {Opt_i_version, "i_version"},
923ae0ff 1222 {Opt_dax, "dax"},
c9de560d 1223 {Opt_stripe, "stripe=%u"},
64769240 1224 {Opt_delalloc, "delalloc"},
a26f4992
TT		 1225 {Opt_lazytime, "lazytime"},
1226 {Opt_nolazytime, "nolazytime"},
dd919b98 1227 {Opt_nodelalloc, "nodelalloc"},
36ade451
JK		 1228 {Opt_removed, "mblk_io_submit"},
1229 {Opt_removed, "nomblk_io_submit"},
6fd058f7
TT		 1230 {Opt_block_validity, "block_validity"},
1231 {Opt_noblock_validity, "noblock_validity"},
240799cd 1232 {Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
b3881f74 1233 {Opt_journal_ioprio, "journal_ioprio=%u"},
afd4672d 1234 {Opt_auto_da_alloc, "auto_da_alloc=%u"},
06705bff
TT		 1235 {Opt_auto_da_alloc, "auto_da_alloc"},
1236 {Opt_noauto_da_alloc, "noauto_da_alloc"},
744692dc
JZ		 1237 {Opt_dioread_nolock, "dioread_nolock"},
1238 {Opt_dioread_lock, "dioread_lock"},
5328e635
ES		 1239 {Opt_discard, "discard"},
1240 {Opt_nodiscard, "nodiscard"},
fc6cb1cd
TT		 1241 {Opt_init_itable, "init_itable=%u"},
1242 {Opt_init_itable, "init_itable"},
1243 {Opt_noinit_itable, "noinit_itable"},
df981d03 1244 {Opt_max_dir_size_kb, "max_dir_size_kb=%u"},
6ddb2447 1245 {Opt_test_dummy_encryption, "test_dummy_encryption"},
c7198b9c
TT		 1246 {Opt_removed, "check=none"}, /* mount option from ext2/3 */
1247 {Opt_removed, "nocheck"}, /* mount option from ext2/3 */
1248 {Opt_removed, "reservation"}, /* mount option from ext2/3 */
1249 {Opt_removed, "noreservation"}, /* mount option from ext2/3 */
1250 {Opt_removed, "journal=%u"}, /* mount option from ext2/3 */
f3f12faa 1251 {Opt_err, NULL},
ac27a0ec
DK		 1252};
1253
617ba13b 1254static ext4_fsblk_t get_sb_block(void **data)
ac27a0ec 1255{
617ba13b 1256 ext4_fsblk_t sb_block;
ac27a0ec
DK		 1257 char *options = (char *) *data;
1258
1259 if (!options || strncmp(options, "sb=", 3) != 0)
1260 return 1; /* Default location */
0b8e58a1 1261
ac27a0ec 1262 options += 3;
0b8e58a1 1263 /* TODO: use simple_strtoll with >32bit ext4 */
ac27a0ec
DK		 1264 sb_block = simple_strtoul(options, &options, 0);
1265 if (*options && *options != ',') {
4776004f 1266 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
ac27a0ec
DK		 1267 (char *) *data);
1268 return 1;
1269 }
1270 if (*options == ',')
1271 options++;
1272 *data = (void *) options;
0b8e58a1 1273
ac27a0ec
DK		 1274 return sb_block;
1275}
1276
b3881f74 1277#define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
437ca0fd
DM		 1278static char deprecated_msg[] = "Mount option \"%s\" will be removed by %s\n"
1279 "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
b3881f74 1280
56c50f11
DM		 1281#ifdef CONFIG_QUOTA
1282static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
1283{
1284 struct ext4_sb_info *sbi = EXT4_SB(sb);
1285 char *qname;
03dafb5f 1286 int ret = -1;
56c50f11
DM		 1287
1288 if (sb_any_quota_loaded(sb) &&
1289 !sbi->s_qf_names[qtype]) {
1290 ext4_msg(sb, KERN_ERR,
1291 "Cannot change journaled "
1292 "quota options when quota turned on");
57f73c2c 1293 return -1;
56c50f11 1294 }
e2b911c5 1295 if (ext4_has_feature_quota(sb)) {
262b4662
JK		 1296 ext4_msg(sb, KERN_ERR, "Cannot set journaled quota options "
1297 "when QUOTA feature is enabled");
1298 return -1;
1299 }
56c50f11
DM		 1300 qname = match_strdup(args);
1301 if (!qname) {
1302 ext4_msg(sb, KERN_ERR,
1303 "Not enough memory for storing quotafile name");
57f73c2c 1304 return -1;
56c50f11 1305 }
03dafb5f
CG		 1306 if (sbi->s_qf_names[qtype]) {
1307 if (strcmp(sbi->s_qf_names[qtype], qname) == 0)
1308 ret = 1;
1309 else
1310 ext4_msg(sb, KERN_ERR,
1311 "%s quota file already specified",
1312 QTYPE2NAME(qtype));
1313 goto errout;
56c50f11 1314 }
03dafb5f 1315 if (strchr(qname, '/')) {
56c50f11
DM		 1316 ext4_msg(sb, KERN_ERR,
1317 "quotafile must be on filesystem root");
03dafb5f 1318 goto errout;
56c50f11 1319 }
03dafb5f 1320 sbi->s_qf_names[qtype] = qname;
fd8c37ec 1321 set_opt(sb, QUOTA);
56c50f11 1322 return 1;
03dafb5f
CG		 1323errout:
1324 kfree(qname);
1325 return ret;
56c50f11
DM		 1326}
1327
1328static int clear_qf_name(struct super_block *sb, int qtype)
1329{
1330
1331 struct ext4_sb_info *sbi = EXT4_SB(sb);
1332
1333 if (sb_any_quota_loaded(sb) &&
1334 sbi->s_qf_names[qtype]) {
1335 ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options"
1336 " when quota turned on");
57f73c2c 1337 return -1;
56c50f11 1338 }
03dafb5f 1339 kfree(sbi->s_qf_names[qtype]);
56c50f11
DM		 1340 sbi->s_qf_names[qtype] = NULL;
1341 return 1;
1342}
1343#endif
1344
26092bf5
TT		 1345#define MOPT_SET 0x0001
1346#define MOPT_CLEAR 0x0002
1347#define MOPT_NOSUPPORT 0x0004
1348#define MOPT_EXPLICIT 0x0008
1349#define MOPT_CLEAR_ERR 0x0010
1350#define MOPT_GTE0 0x0020
ac27a0ec 1351#ifdef CONFIG_QUOTA
26092bf5
TT		 1352#define MOPT_Q 0
1353#define MOPT_QFMT 0x0040
1354#else
1355#define MOPT_Q MOPT_NOSUPPORT
1356#define MOPT_QFMT MOPT_NOSUPPORT
ac27a0ec 1357#endif
26092bf5 1358#define MOPT_DATAJ 0x0080
8dc0aa8c
TT		 1359#define MOPT_NO_EXT2 0x0100
1360#define MOPT_NO_EXT3 0x0200
1361#define MOPT_EXT4_ONLY (MOPT_NO_EXT2 | MOPT_NO_EXT3)
ad4eec61 1362#define MOPT_STRING 0x0400
26092bf5
TT		 1363
1364static const struct mount_opts {
1365 int token;
1366 int mount_opt;
1367 int flags;
1368} ext4_mount_opts[] = {
1369 {Opt_minix_df, EXT4_MOUNT_MINIX_DF, MOPT_SET},
1370 {Opt_bsd_df, EXT4_MOUNT_MINIX_DF, MOPT_CLEAR},
1371 {Opt_grpid, EXT4_MOUNT_GRPID, MOPT_SET},
1372 {Opt_nogrpid, EXT4_MOUNT_GRPID, MOPT_CLEAR},
26092bf5
TT		 1373 {Opt_block_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_SET},
1374 {Opt_noblock_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_CLEAR},
8dc0aa8c
TT		 1375 {Opt_dioread_nolock, EXT4_MOUNT_DIOREAD_NOLOCK,
1376 MOPT_EXT4_ONLY | MOPT_SET},
1377 {Opt_dioread_lock, EXT4_MOUNT_DIOREAD_NOLOCK,
1378 MOPT_EXT4_ONLY | MOPT_CLEAR},
26092bf5
TT		 1379 {Opt_discard, EXT4_MOUNT_DISCARD, MOPT_SET},
1380 {Opt_nodiscard, EXT4_MOUNT_DISCARD, MOPT_CLEAR},
8dc0aa8c
TT		 1381 {Opt_delalloc, EXT4_MOUNT_DELALLOC,
1382 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
1383 {Opt_nodelalloc, EXT4_MOUNT_DELALLOC,
59d9fa5c 1384 MOPT_EXT4_ONLY | MOPT_CLEAR},
c6d3d56d
DW		 1385 {Opt_nojournal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
1386 MOPT_EXT4_ONLY | MOPT_CLEAR},
8dc0aa8c 1387 {Opt_journal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
1e381f60 1388 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
26092bf5 1389 {Opt_journal_async_commit, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT |
8dc0aa8c 1390 EXT4_MOUNT_JOURNAL_CHECKSUM),
1e381f60 1391 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
8dc0aa8c 1392 {Opt_noload, EXT4_MOUNT_NOLOAD, MOPT_NO_EXT2 | MOPT_SET},
26092bf5
TT		 1393 {Opt_err_panic, EXT4_MOUNT_ERRORS_PANIC, MOPT_SET | MOPT_CLEAR_ERR},
1394 {Opt_err_ro, EXT4_MOUNT_ERRORS_RO, MOPT_SET | MOPT_CLEAR_ERR},
1395 {Opt_err_cont, EXT4_MOUNT_ERRORS_CONT, MOPT_SET | MOPT_CLEAR_ERR},
8dc0aa8c
TT		 1396 {Opt_data_err_abort, EXT4_MOUNT_DATA_ERR_ABORT,
1397 MOPT_NO_EXT2 | MOPT_SET},
1398 {Opt_data_err_ignore, EXT4_MOUNT_DATA_ERR_ABORT,
1399 MOPT_NO_EXT2 | MOPT_CLEAR},
26092bf5
TT		 1400 {Opt_barrier, EXT4_MOUNT_BARRIER, MOPT_SET},
1401 {Opt_nobarrier, EXT4_MOUNT_BARRIER, MOPT_CLEAR},
1402 {Opt_noauto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_SET},
1403 {Opt_auto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_CLEAR},
1404 {Opt_noinit_itable, EXT4_MOUNT_INIT_INODE_TABLE, MOPT_CLEAR},
1405 {Opt_commit, 0, MOPT_GTE0},
1406 {Opt_max_batch_time, 0, MOPT_GTE0},
1407 {Opt_min_batch_time, 0, MOPT_GTE0},
1408 {Opt_inode_readahead_blks, 0, MOPT_GTE0},
1409 {Opt_init_itable, 0, MOPT_GTE0},
923ae0ff 1410 {Opt_dax, EXT4_MOUNT_DAX, MOPT_SET},
26092bf5 1411 {Opt_stripe, 0, MOPT_GTE0},
0efb3b23
JK		 1412 {Opt_resuid, 0, MOPT_GTE0},
1413 {Opt_resgid, 0, MOPT_GTE0},
5ba92bcf
CM		 1414 {Opt_journal_dev, 0, MOPT_NO_EXT2 | MOPT_GTE0},
1415 {Opt_journal_path, 0, MOPT_NO_EXT2 | MOPT_STRING},
1416 {Opt_journal_ioprio, 0, MOPT_NO_EXT2 | MOPT_GTE0},
8dc0aa8c
TT		 1417 {Opt_data_journal, EXT4_MOUNT_JOURNAL_DATA, MOPT_NO_EXT2 | MOPT_DATAJ},
1418 {Opt_data_ordered, EXT4_MOUNT_ORDERED_DATA, MOPT_NO_EXT2 | MOPT_DATAJ},
1419 {Opt_data_writeback, EXT4_MOUNT_WRITEBACK_DATA,
1420 MOPT_NO_EXT2 | MOPT_DATAJ},
26092bf5
TT		 1421 {Opt_user_xattr, EXT4_MOUNT_XATTR_USER, MOPT_SET},
1422 {Opt_nouser_xattr, EXT4_MOUNT_XATTR_USER, MOPT_CLEAR},
03010a33 1423#ifdef CONFIG_EXT4_FS_POSIX_ACL
26092bf5
TT		 1424 {Opt_acl, EXT4_MOUNT_POSIX_ACL, MOPT_SET},
1425 {Opt_noacl, EXT4_MOUNT_POSIX_ACL, MOPT_CLEAR},
ac27a0ec 1426#else
26092bf5
TT		 1427 {Opt_acl, 0, MOPT_NOSUPPORT},
1428 {Opt_noacl, 0, MOPT_NOSUPPORT},
ac27a0ec 1429#endif
26092bf5
TT		 1430 {Opt_nouid32, EXT4_MOUNT_NO_UID32, MOPT_SET},
1431 {Opt_debug, EXT4_MOUNT_DEBUG, MOPT_SET},
1432 {Opt_quota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA, MOPT_SET | MOPT_Q},
1433 {Opt_usrquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA,
1434 MOPT_SET | MOPT_Q},
1435 {Opt_grpquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_GRPQUOTA,
1436 MOPT_SET | MOPT_Q},
1437 {Opt_noquota, (EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA |
1438 EXT4_MOUNT_GRPQUOTA), MOPT_CLEAR | MOPT_Q},
1439 {Opt_usrjquota, 0, MOPT_Q},
1440 {Opt_grpjquota, 0, MOPT_Q},
1441 {Opt_offusrjquota, 0, MOPT_Q},
1442 {Opt_offgrpjquota, 0, MOPT_Q},
1443 {Opt_jqfmt_vfsold, QFMT_VFS_OLD, MOPT_QFMT},
1444 {Opt_jqfmt_vfsv0, QFMT_VFS_V0, MOPT_QFMT},
1445 {Opt_jqfmt_vfsv1, QFMT_VFS_V1, MOPT_QFMT},
df981d03 1446 {Opt_max_dir_size_kb, 0, MOPT_GTE0},
6ddb2447 1447 {Opt_test_dummy_encryption, 0, MOPT_GTE0},
26092bf5
TT		 1448 {Opt_err, 0, 0}
1449};
1450
1451static int handle_mount_opt(struct super_block *sb, char *opt, int token,
1452 substring_t *args, unsigned long *journal_devnum,
1453 unsigned int *journal_ioprio, int is_remount)
1454{
1455 struct ext4_sb_info *sbi = EXT4_SB(sb);
1456 const struct mount_opts *m;
08cefc7a
EB		 1457 kuid_t uid;
1458 kgid_t gid;
26092bf5
TT		 1459 int arg = 0;
1460
57f73c2c
TT		 1461#ifdef CONFIG_QUOTA
1462 if (token == Opt_usrjquota)
1463 return set_qf_name(sb, USRQUOTA, &args[0]);
1464 else if (token == Opt_grpjquota)
1465 return set_qf_name(sb, GRPQUOTA, &args[0]);
1466 else if (token == Opt_offusrjquota)
1467 return clear_qf_name(sb, USRQUOTA);
1468 else if (token == Opt_offgrpjquota)
1469 return clear_qf_name(sb, GRPQUOTA);
1470#endif
26092bf5 1471 switch (token) {
f7048605
TT		 1472 case Opt_noacl:
1473 case Opt_nouser_xattr:
1474 ext4_msg(sb, KERN_WARNING, deprecated_msg, opt, "3.5");
1475 break;
26092bf5
TT		 1476 case Opt_sb:
1477 return 1; /* handled by get_sb_block() */
1478 case Opt_removed:
5f3633e3 1479 ext4_msg(sb, KERN_WARNING, "Ignoring removed %s option", opt);
26092bf5 1480 return 1;
26092bf5
TT		 1481 case Opt_abort:
1482 sbi->s_mount_flags |= EXT4_MF_FS_ABORTED;
1483 return 1;
1484 case Opt_i_version:
1485 sb->s_flags |= MS_I_VERSION;
1486 return 1;
a26f4992
TT		 1487 case Opt_lazytime:
1488 sb->s_flags |= MS_LAZYTIME;
1489 return 1;
1490 case Opt_nolazytime:
1491 sb->s_flags &= ~MS_LAZYTIME;
1492 return 1;
26092bf5
TT		 1493 }
1494
5f3633e3
JK		 1495 for (m = ext4_mount_opts; m->token != Opt_err; m++)
1496 if (token == m->token)
1497 break;
1498
1499 if (m->token == Opt_err) {
1500 ext4_msg(sb, KERN_ERR, "Unrecognized mount option \"%s\" "
1501 "or missing value", opt);
1502 return -1;
1503 }
1504
8dc0aa8c
TT		 1505 if ((m->flags & MOPT_NO_EXT2) && IS_EXT2_SB(sb)) {
1506 ext4_msg(sb, KERN_ERR,
1507 "Mount option \"%s\" incompatible with ext2", opt);
1508 return -1;
1509 }
1510 if ((m->flags & MOPT_NO_EXT3) && IS_EXT3_SB(sb)) {
1511 ext4_msg(sb, KERN_ERR,
1512 "Mount option \"%s\" incompatible with ext3", opt);
1513 return -1;
1514 }
1515
ad4eec61 1516 if (args->from && !(m->flags & MOPT_STRING) && match_int(args, &arg))
5f3633e3
JK		 1517 return -1;
1518 if (args->from && (m->flags & MOPT_GTE0) && (arg < 0))
1519 return -1;
c93cf2d7
DM		 1520 if (m->flags & MOPT_EXPLICIT) {
1521 if (m->mount_opt & EXT4_MOUNT_DELALLOC) {
1522 set_opt2(sb, EXPLICIT_DELALLOC);
1e381f60
DM		 1523 } else if (m->mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) {
1524 set_opt2(sb, EXPLICIT_JOURNAL_CHECKSUM);
c93cf2d7
DM		 1525 } else
1526 return -1;
1527 }
5f3633e3
JK		 1528 if (m->flags & MOPT_CLEAR_ERR)
1529 clear_opt(sb, ERRORS_MASK);
1530 if (token == Opt_noquota && sb_any_quota_loaded(sb)) {
1531 ext4_msg(sb, KERN_ERR, "Cannot change quota "
1532 "options when quota turned on");
1533 return -1;
1534 }
1535
1536 if (m->flags & MOPT_NOSUPPORT) {
1537 ext4_msg(sb, KERN_ERR, "%s option not supported", opt);
1538 } else if (token == Opt_commit) {
1539 if (arg == 0)
1540 arg = JBD2_DEFAULT_MAX_COMMIT_AGE;
1541 sbi->s_commit_interval = HZ * arg;
1542 } else if (token == Opt_max_batch_time) {
5f3633e3
JK		 1543 sbi->s_max_batch_time = arg;
1544 } else if (token == Opt_min_batch_time) {
1545 sbi->s_min_batch_time = arg;
1546 } else if (token == Opt_inode_readahead_blks) {
e33e60ea
JK		 1547 if (arg && (arg > (1 << 30) || !is_power_of_2(arg))) {
1548 ext4_msg(sb, KERN_ERR,
1549 "EXT4-fs: inode_readahead_blks must be "
1550 "0 or a power of 2 smaller than 2^31");
26092bf5 1551 return -1;
5f3633e3
JK		 1552 }
1553 sbi->s_inode_readahead_blks = arg;
1554 } else if (token == Opt_init_itable) {
1555 set_opt(sb, INIT_INODE_TABLE);
1556 if (!args->from)
1557 arg = EXT4_DEF_LI_WAIT_MULT;
1558 sbi->s_li_wait_mult = arg;
1559 } else if (token == Opt_max_dir_size_kb) {
1560 sbi->s_max_dir_size_kb = arg;
1561 } else if (token == Opt_stripe) {
1562 sbi->s_stripe = arg;
1563 } else if (token == Opt_resuid) {
1564 uid = make_kuid(current_user_ns(), arg);
1565 if (!uid_valid(uid)) {
1566 ext4_msg(sb, KERN_ERR, "Invalid uid value %d", arg);
26092bf5
TT		 1567 return -1;
1568 }
5f3633e3
JK		 1569 sbi->s_resuid = uid;
1570 } else if (token == Opt_resgid) {
1571 gid = make_kgid(current_user_ns(), arg);
1572 if (!gid_valid(gid)) {
1573 ext4_msg(sb, KERN_ERR, "Invalid gid value %d", arg);
1574 return -1;
1575 }
1576 sbi->s_resgid = gid;
1577 } else if (token == Opt_journal_dev) {
1578 if (is_remount) {
1579 ext4_msg(sb, KERN_ERR,
1580 "Cannot specify journal on remount");
1581 return -1;
1582 }
1583 *journal_devnum = arg;
ad4eec61
ES		 1584 } else if (token == Opt_journal_path) {
1585 char *journal_path;
1586 struct inode *journal_inode;
1587 struct path path;
1588 int error;
1589
1590 if (is_remount) {
1591 ext4_msg(sb, KERN_ERR,
1592 "Cannot specify journal on remount");
1593 return -1;
1594 }
1595 journal_path = match_strdup(&args[0]);
1596 if (!journal_path) {
1597 ext4_msg(sb, KERN_ERR, "error: could not dup "
1598 "journal device string");
1599 return -1;
1600 }
1601
1602 error = kern_path(journal_path, LOOKUP_FOLLOW, &path);
1603 if (error) {
1604 ext4_msg(sb, KERN_ERR, "error: could not find "
1605 "journal device path: error %d", error);
1606 kfree(journal_path);
1607 return -1;
1608 }
1609
2b0143b5 1610 journal_inode = d_inode(path.dentry);
ad4eec61
ES		 1611 if (!S_ISBLK(journal_inode->i_mode)) {
1612 ext4_msg(sb, KERN_ERR, "error: journal path %s "
1613 "is not a block device", journal_path);
1614 path_put(&path);
1615 kfree(journal_path);
1616 return -1;
1617 }
1618
1619 *journal_devnum = new_encode_dev(journal_inode->i_rdev);
1620 path_put(&path);
1621 kfree(journal_path);
5f3633e3
JK		 1622 } else if (token == Opt_journal_ioprio) {
1623 if (arg > 7) {
1624 ext4_msg(sb, KERN_ERR, "Invalid journal IO priority"
1625 " (must be 0-7)");
1626 return -1;
1627 }
1628 *journal_ioprio =
1629 IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, arg);
6ddb2447
TT		 1630 } else if (token == Opt_test_dummy_encryption) {
1631#ifdef CONFIG_EXT4_FS_ENCRYPTION
1632 sbi->s_mount_flags |= EXT4_MF_TEST_DUMMY_ENCRYPTION;
1633 ext4_msg(sb, KERN_WARNING,
1634 "Test dummy encryption mode enabled");
1635#else
1636 ext4_msg(sb, KERN_WARNING,
1637 "Test dummy encryption mount option ignored");
1638#endif
5f3633e3
JK		 1639 } else if (m->flags & MOPT_DATAJ) {
1640 if (is_remount) {
1641 if (!sbi->s_journal)
1642 ext4_msg(sb, KERN_WARNING, "Remounting file system with no journal so ignoring journalled data option");
1643 else if (test_opt(sb, DATA_FLAGS) != m->mount_opt) {
0efb3b23 1644 ext4_msg(sb, KERN_ERR,
26092bf5 1645 "Cannot change data mode on remount");
26092bf5 1646 return -1;
ac27a0ec 1647 }
26092bf5 1648 } else {
5f3633e3
JK		 1649 clear_opt(sb, DATA_FLAGS);
1650 sbi->s_mount_opt |= m->mount_opt;
ac27a0ec 1651 }
5f3633e3
JK		 1652#ifdef CONFIG_QUOTA
1653 } else if (m->flags & MOPT_QFMT) {
1654 if (sb_any_quota_loaded(sb) &&
1655 sbi->s_jquota_fmt != m->mount_opt) {
1656 ext4_msg(sb, KERN_ERR, "Cannot change journaled "
1657 "quota options when quota turned on");
1658 return -1;
1659 }
e2b911c5 1660 if (ext4_has_feature_quota(sb)) {
262b4662
JK		 1661 ext4_msg(sb, KERN_ERR,
1662 "Cannot set journaled quota options "
1663 "when QUOTA feature is enabled");
1664 return -1;
1665 }
5f3633e3 1666 sbi->s_jquota_fmt = m->mount_opt;
923ae0ff 1667#endif
923ae0ff 1668 } else if (token == Opt_dax) {
ef83b6e8
DW		 1669#ifdef CONFIG_FS_DAX
1670 ext4_msg(sb, KERN_WARNING,
1671 "DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
1672 sbi->s_mount_opt |= m->mount_opt;
1673#else
923ae0ff
RZ		 1674 ext4_msg(sb, KERN_INFO, "dax option not supported");
1675 return -1;
5f3633e3
JK		 1676#endif
1677 } else {
1678 if (!args->from)
1679 arg = 1;
1680 if (m->flags & MOPT_CLEAR)
1681 arg = !arg;
1682 else if (unlikely(!(m->flags & MOPT_SET))) {
1683 ext4_msg(sb, KERN_WARNING,
1684 "buggy handling of option %s", opt);
1685 WARN_ON(1);
1686 return -1;
1687 }
1688 if (arg != 0)
1689 sbi->s_mount_opt |= m->mount_opt;
1690 else
1691 sbi->s_mount_opt &= ~m->mount_opt;
26092bf5 1692 }
5f3633e3 1693 return 1;
26092bf5
TT		 1694}
1695
1696static int parse_options(char *options, struct super_block *sb,
1697 unsigned long *journal_devnum,
1698 unsigned int *journal_ioprio,
1699 int is_remount)
1700{
1701 struct ext4_sb_info *sbi = EXT4_SB(sb);
1702 char *p;
1703 substring_t args[MAX_OPT_ARGS];
1704 int token;
1705
1706 if (!options)
1707 return 1;
1708
1709 while ((p = strsep(&options, ",")) != NULL) {
1710 if (!*p)
1711 continue;
1712 /*
1713 * Initialize args struct so we know whether arg was
1714 * found; some options take optional arguments.
1715 */
caecd0af 1716 args[0].to = args[0].from = NULL;
26092bf5
TT		 1717 token = match_token(p, tokens, args);
1718 if (handle_mount_opt(sb, p, token, args, journal_devnum,
1719 journal_ioprio, is_remount) < 0)
1720 return 0;
ac27a0ec
DK		 1721 }
1722#ifdef CONFIG_QUOTA
e2b911c5 1723 if (ext4_has_feature_quota(sb) &&
262b4662
JK		 1724 (test_opt(sb, USRQUOTA) || test_opt(sb, GRPQUOTA))) {
1725 ext4_msg(sb, KERN_ERR, "Cannot set quota options when QUOTA "
1726 "feature is enabled");
1727 return 0;
1728 }
ac27a0ec 1729 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
482a7425 1730 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
fd8c37ec 1731 clear_opt(sb, USRQUOTA);
ac27a0ec 1732
482a7425 1733 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
fd8c37ec 1734 clear_opt(sb, GRPQUOTA);
ac27a0ec 1735
56c50f11 1736 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
b31e1552
ES		 1737 ext4_msg(sb, KERN_ERR, "old and new quota "
1738 "format mixing");
ac27a0ec
DK		 1739 return 0;
1740 }
1741
1742 if (!sbi->s_jquota_fmt) {
b31e1552
ES		 1743 ext4_msg(sb, KERN_ERR, "journaled quota format "
1744 "not specified");
ac27a0ec
DK		 1745 return 0;
1746 }
ac27a0ec
DK		 1747 }
1748#endif
261cb20c
JK		 1749 if (test_opt(sb, DIOREAD_NOLOCK)) {
1750 int blocksize =
1751 BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);
1752
1753 if (blocksize < PAGE_CACHE_SIZE) {
1754 ext4_msg(sb, KERN_ERR, "can't mount with "
1755 "dioread_nolock if block size != PAGE_SIZE");
1756 return 0;
1757 }
1758 }
d4f76107
JK		 1759 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA &&
1760 test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
1761 ext4_msg(sb, KERN_ERR, "can't mount with journal_async_commit "
1762 "in data=ordered mode");
1763 return 0;
1764 }
ac27a0ec
DK		 1765 return 1;
1766}
1767
2adf6da8
TT		 1768static inline void ext4_show_quota_options(struct seq_file *seq,
1769 struct super_block *sb)
1770{
1771#if defined(CONFIG_QUOTA)
1772 struct ext4_sb_info *sbi = EXT4_SB(sb);
1773
1774 if (sbi->s_jquota_fmt) {
1775 char *fmtname = "";
1776
1777 switch (sbi->s_jquota_fmt) {
1778 case QFMT_VFS_OLD:
1779 fmtname = "vfsold";
1780 break;
1781 case QFMT_VFS_V0:
1782 fmtname = "vfsv0";
1783 break;
1784 case QFMT_VFS_V1:
1785 fmtname = "vfsv1";
1786 break;
1787 }
1788 seq_printf(seq, ",jqfmt=%s", fmtname);
1789 }
1790
1791 if (sbi->s_qf_names[USRQUOTA])
a068acf2 1792 seq_show_option(seq, "usrjquota", sbi->s_qf_names[USRQUOTA]);
2adf6da8
TT		 1793
1794 if (sbi->s_qf_names[GRPQUOTA])
a068acf2 1795 seq_show_option(seq, "grpjquota", sbi->s_qf_names[GRPQUOTA]);
2adf6da8
TT		 1796#endif
1797}
1798
5a916be1
TT		 1799static const char *token2str(int token)
1800{
50df9fd5 1801 const struct match_token *t;
5a916be1
TT		 1802
1803 for (t = tokens; t->token != Opt_err; t++)
1804 if (t->token == token && !strchr(t->pattern, '='))
1805 break;
1806 return t->pattern;
1807}
1808
2adf6da8
TT		 1809/*
1810 * Show an option if
1811 * - it's set to a non-default value OR
1812 * - if the per-sb default is different from the global default
1813 */
66acdcf4
TT		 1814static int _ext4_show_options(struct seq_file *seq, struct super_block *sb,
1815 int nodefs)
2adf6da8 1816{
2adf6da8
TT		 1817 struct ext4_sb_info *sbi = EXT4_SB(sb);
1818 struct ext4_super_block *es = sbi->s_es;
66acdcf4 1819 int def_errors, def_mount_opt = nodefs ? 0 : sbi->s_def_mount_opt;
5a916be1 1820 const struct mount_opts *m;
66acdcf4 1821 char sep = nodefs ? '\n' : ',';
2adf6da8 1822
66acdcf4
TT		 1823#define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep)
1824#define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg)
2adf6da8
TT		 1825
1826 if (sbi->s_sb_block != 1)
5a916be1
TT		 1827 SEQ_OPTS_PRINT("sb=%llu", sbi->s_sb_block);
1828
1829 for (m = ext4_mount_opts; m->token != Opt_err; m++) {
1830 int want_set = m->flags & MOPT_SET;
1831 if (((m->flags & (MOPT_SET|MOPT_CLEAR)) == 0) ||
1832 (m->flags & MOPT_CLEAR_ERR))
1833 continue;
66acdcf4 1834 if (!(m->mount_opt & (sbi->s_mount_opt ^ def_mount_opt)))
5a916be1
TT		 1835 continue; /* skip if same as the default */
1836 if ((want_set &&
1837 (sbi->s_mount_opt & m->mount_opt) != m->mount_opt) ||
1838 (!want_set && (sbi->s_mount_opt & m->mount_opt)))
1839 continue; /* select Opt_noFoo vs Opt_Foo */
1840 SEQ_OPTS_PRINT("%s", token2str(m->token));
2adf6da8 1841 }
5a916be1 1842
08cefc7a 1843 if (nodefs || !uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT4_DEF_RESUID)) ||
5a916be1 1844 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID)
08cefc7a
EB		 1845 SEQ_OPTS_PRINT("resuid=%u",
1846 from_kuid_munged(&init_user_ns, sbi->s_resuid));
1847 if (nodefs || !gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT4_DEF_RESGID)) ||
5a916be1 1848 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID)
08cefc7a
EB		 1849 SEQ_OPTS_PRINT("resgid=%u",
1850 from_kgid_munged(&init_user_ns, sbi->s_resgid));
66acdcf4 1851 def_errors = nodefs ? -1 : le16_to_cpu(es->s_errors);
5a916be1
TT		 1852 if (test_opt(sb, ERRORS_RO) && def_errors != EXT4_ERRORS_RO)
1853 SEQ_OPTS_PUTS("errors=remount-ro");
2adf6da8 1854 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
5a916be1 1855 SEQ_OPTS_PUTS("errors=continue");
2adf6da8 1856 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
5a916be1 1857 SEQ_OPTS_PUTS("errors=panic");
66acdcf4 1858 if (nodefs || sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ)
5a916be1 1859 SEQ_OPTS_PRINT("commit=%lu", sbi->s_commit_interval / HZ);
66acdcf4 1860 if (nodefs || sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME)
5a916be1 1861 SEQ_OPTS_PRINT("min_batch_time=%u", sbi->s_min_batch_time);
66acdcf4 1862 if (nodefs || sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME)
5a916be1 1863 SEQ_OPTS_PRINT("max_batch_time=%u", sbi->s_max_batch_time);
2adf6da8 1864 if (sb->s_flags & MS_I_VERSION)
5a916be1 1865 SEQ_OPTS_PUTS("i_version");
66acdcf4 1866 if (nodefs || sbi->s_stripe)
5a916be1 1867 SEQ_OPTS_PRINT("stripe=%lu", sbi->s_stripe);
66acdcf4 1868 if (EXT4_MOUNT_DATA_FLAGS & (sbi->s_mount_opt ^ def_mount_opt)) {
5a916be1
TT		 1869 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
1870 SEQ_OPTS_PUTS("data=journal");
1871 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
1872 SEQ_OPTS_PUTS("data=ordered");
1873 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
1874 SEQ_OPTS_PUTS("data=writeback");
1875 }
66acdcf4
TT		 1876 if (nodefs ||
1877 sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
5a916be1
TT		 1878 SEQ_OPTS_PRINT("inode_readahead_blks=%u",
1879 sbi->s_inode_readahead_blks);
2adf6da8 1880
66acdcf4
TT		 1881 if (nodefs || (test_opt(sb, INIT_INODE_TABLE) &&
1882 (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT)))
5a916be1 1883 SEQ_OPTS_PRINT("init_itable=%u", sbi->s_li_wait_mult);
df981d03
TT		 1884 if (nodefs || sbi->s_max_dir_size_kb)
1885 SEQ_OPTS_PRINT("max_dir_size_kb=%u", sbi->s_max_dir_size_kb);
2adf6da8
TT		 1886
1887 ext4_show_quota_options(seq, sb);
2adf6da8
TT		 1888 return 0;
1889}
1890
66acdcf4
TT		 1891static int ext4_show_options(struct seq_file *seq, struct dentry *root)
1892{
1893 return _ext4_show_options(seq, root->d_sb, 0);
1894}
1895
ebd173be 1896int ext4_seq_options_show(struct seq_file *seq, void *offset)
66acdcf4
TT		 1897{
1898 struct super_block *sb = seq->private;
1899 int rc;
1900
1901 seq_puts(seq, (sb->s_flags & MS_RDONLY) ? "ro" : "rw");
1902 rc = _ext4_show_options(seq, sb, 1);
1903 seq_puts(seq, "\n");
1904 return rc;
1905}
1906
617ba13b 1907static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
ac27a0ec
DK		 1908 int read_only)
1909{
617ba13b 1910 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec
DK		 1911 int res = 0;
1912
617ba13b 1913 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
b31e1552
ES		 1914 ext4_msg(sb, KERN_ERR, "revision level too high, "
1915 "forcing read-only mode");
ac27a0ec
DK		 1916 res = MS_RDONLY;
1917 }
1918 if (read_only)
281b5995 1919 goto done;
617ba13b 1920 if (!(sbi->s_mount_state & EXT4_VALID_FS))
b31e1552
ES		 1921 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
1922 "running e2fsck is recommended");
c8b459f4 1923 else if (sbi->s_mount_state & EXT4_ERROR_FS)
b31e1552
ES		 1924 ext4_msg(sb, KERN_WARNING,
1925 "warning: mounting fs with errors, "
1926 "running e2fsck is recommended");
ed3ce80a 1927 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
ac27a0ec
DK		 1928 le16_to_cpu(es->s_mnt_count) >=
1929 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
b31e1552
ES		 1930 ext4_msg(sb, KERN_WARNING,
1931 "warning: maximal mount count reached, "
1932 "running e2fsck is recommended");
ac27a0ec
DK		 1933 else if (le32_to_cpu(es->s_checkinterval) &&
1934 (le32_to_cpu(es->s_lastcheck) +
1935 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
b31e1552
ES		 1936 ext4_msg(sb, KERN_WARNING,
1937 "warning: checktime reached, "
1938 "running e2fsck is recommended");
0b8e58a1 1939 if (!sbi->s_journal)
0390131b 1940 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
ac27a0ec 1941 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
617ba13b 1942 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
e8546d06 1943 le16_add_cpu(&es->s_mnt_count, 1);
ac27a0ec 1944 es->s_mtime = cpu_to_le32(get_seconds());
617ba13b 1945 ext4_update_dynamic_rev(sb);
0390131b 1946 if (sbi->s_journal)
e2b911c5 1947 ext4_set_feature_journal_needs_recovery(sb);
ac27a0ec 1948
e2d67052 1949 ext4_commit_super(sb, 1);
281b5995 1950done:
ac27a0ec 1951 if (test_opt(sb, DEBUG))
a9df9a49 1952 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
a2595b8a 1953 "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
ac27a0ec
DK		 1954 sb->s_blocksize,
1955 sbi->s_groups_count,
617ba13b
MC		 1956 EXT4_BLOCKS_PER_GROUP(sb),
1957 EXT4_INODES_PER_GROUP(sb),
a2595b8a 1958 sbi->s_mount_opt, sbi->s_mount_opt2);
ac27a0ec 1959
7abc52c2 1960 cleancache_init_fs(sb);
ac27a0ec
DK		 1961 return res;
1962}
1963
117fff10
TT		 1964int ext4_alloc_flex_bg_array(struct super_block *sb, ext4_group_t ngroup)
1965{
1966 struct ext4_sb_info *sbi = EXT4_SB(sb);
1967 struct flex_groups *new_groups;
1968 int size;
1969
1970 if (!sbi->s_log_groups_per_flex)
1971 return 0;
1972
1973 size = ext4_flex_group(sbi, ngroup - 1) + 1;
1974 if (size <= sbi->s_flex_groups_allocated)
1975 return 0;
1976
1977 size = roundup_pow_of_two(size * sizeof(struct flex_groups));
1978 new_groups = ext4_kvzalloc(size, GFP_KERNEL);
1979 if (!new_groups) {
1980 ext4_msg(sb, KERN_ERR, "not enough memory for %d flex groups",
1981 size / (int) sizeof(struct flex_groups));
1982 return -ENOMEM;
1983 }
1984
1985 if (sbi->s_flex_groups) {
1986 memcpy(new_groups, sbi->s_flex_groups,
1987 (sbi->s_flex_groups_allocated *
1988 sizeof(struct flex_groups)));
b93b41d4 1989 kvfree(sbi->s_flex_groups);
117fff10
TT		 1990 }
1991 sbi->s_flex_groups = new_groups;
1992 sbi->s_flex_groups_allocated = size / sizeof(struct flex_groups);
1993 return 0;
1994}
1995
772cb7c8
JS		 1996static int ext4_fill_flex_info(struct super_block *sb)
1997{
1998 struct ext4_sb_info *sbi = EXT4_SB(sb);
1999 struct ext4_group_desc *gdp = NULL;
772cb7c8 2000 ext4_group_t flex_group;
117fff10 2001 int i, err;
772cb7c8 2002
503358ae 2003 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
d50f2ab6 2004 if (sbi->s_log_groups_per_flex < 1 || sbi->s_log_groups_per_flex > 31) {
772cb7c8
JS		 2005 sbi->s_log_groups_per_flex = 0;
2006 return 1;
2007 }
2008
117fff10
TT		 2009 err = ext4_alloc_flex_bg_array(sb, sbi->s_groups_count);
2010 if (err)
9933fc0a 2011 goto failed;
772cb7c8 2012
772cb7c8 2013 for (i = 0; i < sbi->s_groups_count; i++) {
88b6edd1 2014 gdp = ext4_get_group_desc(sb, i, NULL);
772cb7c8
JS		 2015
2016 flex_group = ext4_flex_group(sbi, i);
7ad9bb65
TT		 2017 atomic_add(ext4_free_inodes_count(sb, gdp),
2018 &sbi->s_flex_groups[flex_group].free_inodes);
90ba983f
TT		 2019 atomic64_add(ext4_free_group_clusters(sb, gdp),
2020 &sbi->s_flex_groups[flex_group].free_clusters);
7ad9bb65
TT		 2021 atomic_add(ext4_used_dirs_count(sb, gdp),
2022 &sbi->s_flex_groups[flex_group].used_dirs);
772cb7c8
JS		 2023 }
2024
2025 return 1;
2026failed:
2027 return 0;
2028}
2029
e2b911c5 2030static __le16 ext4_group_desc_csum(struct super_block *sb, __u32 block_group,
feb0ab32 2031 struct ext4_group_desc *gdp)
717d50e4 2032{
feb0ab32 2033 int offset;
717d50e4 2034 __u16 crc = 0;
feb0ab32 2035 __le32 le_group = cpu_to_le32(block_group);
e2b911c5 2036 struct ext4_sb_info *sbi = EXT4_SB(sb);
717d50e4 2037
9aa5d32b 2038 if (ext4_has_metadata_csum(sbi->s_sb)) {
feb0ab32 2039 /* Use new metadata_csum algorithm */
d6a77105 2040 __le16 save_csum;
feb0ab32
DW		 2041 __u32 csum32;
2042
d6a77105 2043 save_csum = gdp->bg_checksum;
feb0ab32
DW		 2044 gdp->bg_checksum = 0;
2045 csum32 = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&le_group,
2046 sizeof(le_group));
2047 csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp,
2048 sbi->s_desc_size);
d6a77105 2049 gdp->bg_checksum = save_csum;
feb0ab32
DW		 2050
2051 crc = csum32 & 0xFFFF;
2052 goto out;
717d50e4
AD		 2053 }
2054
feb0ab32 2055 /* old crc16 code */
e2b911c5 2056 if (!ext4_has_feature_gdt_csum(sb))
813d32f9
DW		 2057 return 0;
2058
feb0ab32
DW		 2059 offset = offsetof(struct ext4_group_desc, bg_checksum);
2060
2061 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
2062 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
2063 crc = crc16(crc, (__u8 *)gdp, offset);
2064 offset += sizeof(gdp->bg_checksum); /* skip checksum */
2065 /* for checksum of struct ext4_group_desc do the rest...*/
e2b911c5 2066 if (ext4_has_feature_64bit(sb) &&
feb0ab32
DW		 2067 offset < le16_to_cpu(sbi->s_es->s_desc_size))
2068 crc = crc16(crc, (__u8 *)gdp + offset,
2069 le16_to_cpu(sbi->s_es->s_desc_size) -
2070 offset);
2071
2072out:
717d50e4
AD		 2073 return cpu_to_le16(crc);
2074}
2075
feb0ab32 2076int ext4_group_desc_csum_verify(struct super_block *sb, __u32 block_group,
717d50e4
AD		 2077 struct ext4_group_desc *gdp)
2078{
feb0ab32 2079 if (ext4_has_group_desc_csum(sb) &&
e2b911c5 2080 (gdp->bg_checksum != ext4_group_desc_csum(sb, block_group, gdp)))
717d50e4
AD		 2081 return 0;
2082
2083 return 1;
2084}
2085
feb0ab32
DW		 2086void ext4_group_desc_csum_set(struct super_block *sb, __u32 block_group,
2087 struct ext4_group_desc *gdp)
2088{
2089 if (!ext4_has_group_desc_csum(sb))
2090 return;
e2b911c5 2091 gdp->bg_checksum = ext4_group_desc_csum(sb, block_group, gdp);
feb0ab32
DW		 2092}
2093
ac27a0ec 2094/* Called at mount-time, super-block is locked */
bfff6873
LC		 2095static int ext4_check_descriptors(struct super_block *sb,
2096 ext4_group_t *first_not_zeroed)
ac27a0ec 2097{
617ba13b
MC		 2098 struct ext4_sb_info *sbi = EXT4_SB(sb);
2099 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
2100 ext4_fsblk_t last_block;
bd81d8ee
LV		 2101 ext4_fsblk_t block_bitmap;
2102 ext4_fsblk_t inode_bitmap;
2103 ext4_fsblk_t inode_table;
ce421581 2104 int flexbg_flag = 0;
bfff6873 2105 ext4_group_t i, grp = sbi->s_groups_count;
ac27a0ec 2106
e2b911c5 2107 if (ext4_has_feature_flex_bg(sb))
ce421581
JS		 2108 flexbg_flag = 1;
2109
af5bc92d 2110 ext4_debug("Checking group descriptors");
ac27a0ec 2111
197cd65a
AM		 2112 for (i = 0; i < sbi->s_groups_count; i++) {
2113 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
2114
ce421581 2115 if (i == sbi->s_groups_count - 1 || flexbg_flag)
bd81d8ee 2116 last_block = ext4_blocks_count(sbi->s_es) - 1;
ac27a0ec
DK		 2117 else
2118 last_block = first_block +
617ba13b 2119 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
ac27a0ec 2120
bfff6873
LC		 2121 if ((grp == sbi->s_groups_count) &&
2122 !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2123 grp = i;
2124
8fadc143 2125 block_bitmap = ext4_block_bitmap(sb, gdp);
2b2d6d01 2126 if (block_bitmap < first_block || block_bitmap > last_block) {
b31e1552 2127 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2128 "Block bitmap for group %u not in group "
b31e1552 2129 "(block %llu)!", i, block_bitmap);
ac27a0ec
DK		 2130 return 0;
2131 }
8fadc143 2132 inode_bitmap = ext4_inode_bitmap(sb, gdp);
2b2d6d01 2133 if (inode_bitmap < first_block || inode_bitmap > last_block) {
b31e1552 2134 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2135 "Inode bitmap for group %u not in group "
b31e1552 2136 "(block %llu)!", i, inode_bitmap);
ac27a0ec
DK		 2137 return 0;
2138 }
8fadc143 2139 inode_table = ext4_inode_table(sb, gdp);
bd81d8ee 2140 if (inode_table < first_block ||
2b2d6d01 2141 inode_table + sbi->s_itb_per_group - 1 > last_block) {
b31e1552 2142 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2143 "Inode table for group %u not in group "
b31e1552 2144 "(block %llu)!", i, inode_table);
ac27a0ec
DK		 2145 return 0;
2146 }
955ce5f5 2147 ext4_lock_group(sb, i);
feb0ab32 2148 if (!ext4_group_desc_csum_verify(sb, i, gdp)) {
b31e1552
ES		 2149 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2150 "Checksum for group %u failed (%u!=%u)",
e2b911c5 2151 i, le16_to_cpu(ext4_group_desc_csum(sb, i,
b31e1552 2152 gdp)), le16_to_cpu(gdp->bg_checksum));
7ee1ec4c 2153 if (!(sb->s_flags & MS_RDONLY)) {
955ce5f5 2154 ext4_unlock_group(sb, i);
8a266467 2155 return 0;
7ee1ec4c 2156 }
717d50e4 2157 }
955ce5f5 2158 ext4_unlock_group(sb, i);
ce421581
JS		 2159 if (!flexbg_flag)
2160 first_block += EXT4_BLOCKS_PER_GROUP(sb);
ac27a0ec 2161 }
bfff6873
LC		 2162 if (NULL != first_not_zeroed)
2163 *first_not_zeroed = grp;
ac27a0ec
DK		 2164 return 1;
2165}
2166
617ba13b 2167/* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
ac27a0ec
DK		 2168 * the superblock) which were deleted from all directories, but held open by
2169 * a process at the time of a crash. We walk the list and try to delete these
2170 * inodes at recovery time (only with a read-write filesystem).
2171 *
2172 * In order to keep the orphan inode chain consistent during traversal (in
2173 * case of crash during recovery), we link each inode into the superblock
2174 * orphan list_head and handle it the same way as an inode deletion during
2175 * normal operation (which journals the operations for us).
2176 *
2177 * We only do an iget() and an iput() on each inode, which is very safe if we
2178 * accidentally point at an in-use or already deleted inode. The worst that
2179 * can happen in this case is that we get a "bit already cleared" message from
617ba13b 2180 * ext4_free_inode(). The only reason we would point at a wrong inode is if
ac27a0ec
DK		 2181 * e2fsck was run on this filesystem, and it must have already done the orphan
2182 * inode cleanup for us, so we can safely abort without any further action.
2183 */
2b2d6d01
TT		 2184static void ext4_orphan_cleanup(struct super_block *sb,
2185 struct ext4_super_block *es)
ac27a0ec
DK		 2186{
2187 unsigned int s_flags = sb->s_flags;
2188 int nr_orphans = 0, nr_truncates = 0;
2189#ifdef CONFIG_QUOTA
2190 int i;
2191#endif
2192 if (!es->s_last_orphan) {
2193 jbd_debug(4, "no orphan inodes to clean up\n");
2194 return;
2195 }
2196
a8f48a95 2197 if (bdev_read_only(sb->s_bdev)) {
b31e1552
ES		 2198 ext4_msg(sb, KERN_ERR, "write access "
2199 "unavailable, skipping orphan cleanup");
a8f48a95
ES		 2200 return;
2201 }
2202
d39195c3
AG		 2203 /* Check if feature set would not allow a r/w mount */
2204 if (!ext4_feature_set_ok(sb, 0)) {
2205 ext4_msg(sb, KERN_INFO, "Skipping orphan cleanup due to "
2206 "unknown ROCOMPAT features");
2207 return;
2208 }
2209
617ba13b 2210 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
c25f9bc6
ES		 2211 /* don't clear list on RO mount w/ errors */
2212 if (es->s_last_orphan && !(s_flags & MS_RDONLY)) {
84474976 2213 ext4_msg(sb, KERN_INFO, "Errors on filesystem, "
ac27a0ec 2214 "clearing orphan list.\n");
c25f9bc6
ES		 2215 es->s_last_orphan = 0;
2216 }
ac27a0ec
DK		 2217 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2218 return;
2219 }
2220
2221 if (s_flags & MS_RDONLY) {
b31e1552 2222 ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
ac27a0ec
DK		 2223 sb->s_flags &= ~MS_RDONLY;
2224 }
2225#ifdef CONFIG_QUOTA
2226 /* Needed for iput() to work correctly and not trash data */
2227 sb->s_flags |= MS_ACTIVE;
2228 /* Turn on quotas so that they are updated correctly */
a2d4a646 2229 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
617ba13b
MC		 2230 if (EXT4_SB(sb)->s_qf_names[i]) {
2231 int ret = ext4_quota_on_mount(sb, i);
ac27a0ec 2232 if (ret < 0)
b31e1552
ES		 2233 ext4_msg(sb, KERN_ERR,
2234 "Cannot turn on journaled "
2235 "quota: error %d", ret);
ac27a0ec
DK		 2236 }
2237 }
2238#endif
2239
2240 while (es->s_last_orphan) {
2241 struct inode *inode;
2242
97bd42b9
JB		 2243 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
2244 if (IS_ERR(inode)) {
ac27a0ec
DK		 2245 es->s_last_orphan = 0;
2246 break;
2247 }
2248
617ba13b 2249 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
871a2931 2250 dquot_initialize(inode);
ac27a0ec 2251 if (inode->i_nlink) {
566370a2
PT		 2252 if (test_opt(sb, DEBUG))
2253 ext4_msg(sb, KERN_DEBUG,
2254 "%s: truncating inode %lu to %lld bytes",
2255 __func__, inode->i_ino, inode->i_size);
e5f8eab8 2256 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
ac27a0ec 2257 inode->i_ino, inode->i_size);
721e3eba 2258 mutex_lock(&inode->i_mutex);
55f252c9 2259 truncate_inode_pages(inode->i_mapping, inode->i_size);
617ba13b 2260 ext4_truncate(inode);
721e3eba 2261 mutex_unlock(&inode->i_mutex);
ac27a0ec
DK		 2262 nr_truncates++;
2263 } else {
566370a2
PT		 2264 if (test_opt(sb, DEBUG))
2265 ext4_msg(sb, KERN_DEBUG,
2266 "%s: deleting unreferenced inode %lu",
2267 __func__, inode->i_ino);
ac27a0ec
DK		 2268 jbd_debug(2, "deleting unreferenced inode %lu\n",
2269 inode->i_ino);
2270 nr_orphans++;
2271 }
2272 iput(inode); /* The delete magic happens here! */
2273 }
2274
2b2d6d01 2275#define PLURAL(x) (x), ((x) == 1) ? "" : "s"
ac27a0ec
DK		 2276
2277 if (nr_orphans)
b31e1552
ES		 2278 ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
2279 PLURAL(nr_orphans));
ac27a0ec 2280 if (nr_truncates)
b31e1552
ES		 2281 ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
2282 PLURAL(nr_truncates));
ac27a0ec
DK		 2283#ifdef CONFIG_QUOTA
2284 /* Turn quotas off */
a2d4a646 2285 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
ac27a0ec 2286 if (sb_dqopt(sb)->files[i])
287a8095 2287 dquot_quota_off(sb, i);
ac27a0ec
DK		 2288 }
2289#endif
2290 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
2291}
0b8e58a1 2292
cd2291a4
ES		 2293/*
2294 * Maximal extent format file size.
2295 * Resulting logical blkno at s_maxbytes must fit in our on-disk
2296 * extent format containers, within a sector_t, and within i_blocks
2297 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
2298 * so that won't be a limiting factor.
2299 *
f17722f9
LC		 2300 * However there is other limiting factor. We do store extents in the form
2301 * of starting block and length, hence the resulting length of the extent
2302 * covering maximum file size must fit into on-disk format containers as
2303 * well. Given that length is always by 1 unit bigger than max unit (because
2304 * we count 0 as well) we have to lower the s_maxbytes by one fs block.
2305 *
cd2291a4
ES		 2306 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
2307 */
f287a1a5 2308static loff_t ext4_max_size(int blkbits, int has_huge_files)
cd2291a4
ES		 2309{
2310 loff_t res;
2311 loff_t upper_limit = MAX_LFS_FILESIZE;
2312
2313 /* small i_blocks in vfs inode? */
f287a1a5 2314 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
cd2291a4 2315 /*
90c699a9 2316 * CONFIG_LBDAF is not enabled implies the inode
cd2291a4
ES		 2317 * i_block represent total blocks in 512 bytes
2318 * 32 == size of vfs inode i_blocks * 8
2319 */
2320 upper_limit = (1LL << 32) - 1;
2321
2322 /* total blocks in file system block size */
2323 upper_limit >>= (blkbits - 9);
2324 upper_limit <<= blkbits;
2325 }
2326
f17722f9
LC		 2327 /*
2328 * 32-bit extent-start container, ee_block. We lower the maxbytes
2329 * by one fs block, so ee_len can cover the extent of maximum file
2330 * size
2331 */
2332 res = (1LL << 32) - 1;
cd2291a4 2333 res <<= blkbits;
cd2291a4
ES		 2334
2335 /* Sanity check against vm- & vfs- imposed limits */
2336 if (res > upper_limit)
2337 res = upper_limit;
2338
2339 return res;
2340}
ac27a0ec 2341
ac27a0ec 2342/*
cd2291a4 2343 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
0fc1b451
AK		 2344 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2345 * We need to be 1 filesystem block less than the 2^48 sector limit.
ac27a0ec 2346 */
f287a1a5 2347static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
ac27a0ec 2348{
617ba13b 2349 loff_t res = EXT4_NDIR_BLOCKS;
0fc1b451
AK		 2350 int meta_blocks;
2351 loff_t upper_limit;
0b8e58a1
AD		 2352 /* This is calculated to be the largest file size for a dense, block
2353 * mapped file such that the file's total number of 512-byte sectors,
2354 * including data and all indirect blocks, does not exceed (2^48 - 1).
2355 *
2356 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2357 * number of 512-byte sectors of the file.
0fc1b451
AK		 2358 */
2359
f287a1a5 2360 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
0fc1b451 2361 /*
90c699a9 2362 * !has_huge_files or CONFIG_LBDAF not enabled implies that
0b8e58a1
AD		 2363 * the inode i_block field represents total file blocks in
2364 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
0fc1b451
AK		 2365 */
2366 upper_limit = (1LL << 32) - 1;
2367
2368 /* total blocks in file system block size */
2369 upper_limit >>= (bits - 9);
2370
2371 } else {
8180a562
AK		 2372 /*
2373 * We use 48 bit ext4_inode i_blocks
2374 * With EXT4_HUGE_FILE_FL set the i_blocks
2375 * represent total number of blocks in
2376 * file system block size
2377 */
0fc1b451
AK		 2378 upper_limit = (1LL << 48) - 1;
2379
0fc1b451
AK		 2380 }
2381
2382 /* indirect blocks */
2383 meta_blocks = 1;
2384 /* double indirect blocks */
2385 meta_blocks += 1 + (1LL << (bits-2));
2386 /* tripple indirect blocks */
2387 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
2388
2389 upper_limit -= meta_blocks;
2390 upper_limit <<= bits;
ac27a0ec
DK		 2391
2392 res += 1LL << (bits-2);
2393 res += 1LL << (2*(bits-2));
2394 res += 1LL << (3*(bits-2));
2395 res <<= bits;
2396 if (res > upper_limit)
2397 res = upper_limit;
0fc1b451
AK		 2398
2399 if (res > MAX_LFS_FILESIZE)
2400 res = MAX_LFS_FILESIZE;
2401
ac27a0ec
DK		 2402 return res;
2403}
2404
617ba13b 2405static ext4_fsblk_t descriptor_loc(struct super_block *sb,
0b8e58a1 2406 ext4_fsblk_t logical_sb_block, int nr)
ac27a0ec 2407{
617ba13b 2408 struct ext4_sb_info *sbi = EXT4_SB(sb);
fd2d4291 2409 ext4_group_t bg, first_meta_bg;
ac27a0ec
DK		 2410 int has_super = 0;
2411
2412 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
2413
e2b911c5 2414 if (!ext4_has_feature_meta_bg(sb) || nr < first_meta_bg)
70bbb3e0 2415 return logical_sb_block + nr + 1;
ac27a0ec 2416 bg = sbi->s_desc_per_block * nr;
617ba13b 2417 if (ext4_bg_has_super(sb, bg))
ac27a0ec 2418 has_super = 1;
0b8e58a1 2419
bd63f6b0
DW		 2420 /*
2421 * If we have a meta_bg fs with 1k blocks, group 0's GDT is at
2422 * block 2, not 1. If s_first_data_block == 0 (bigalloc is enabled
2423 * on modern mke2fs or blksize > 1k on older mke2fs) then we must
2424 * compensate.
2425 */
2426 if (sb->s_blocksize == 1024 && nr == 0 &&
2427 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block) == 0)
2428 has_super++;
2429
617ba13b 2430 return (has_super + ext4_group_first_block_no(sb, bg));
ac27a0ec
DK		 2431}
2432
c9de560d
AT		 2433/**
2434 * ext4_get_stripe_size: Get the stripe size.
2435 * @sbi: In memory super block info
2436 *
2437 * If we have specified it via mount option, then
2438 * use the mount option value. If the value specified at mount time is
2439 * greater than the blocks per group use the super block value.
2440 * If the super block value is greater than blocks per group return 0.
2441 * Allocator needs it be less than blocks per group.
2442 *
2443 */
2444static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
2445{
2446 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
2447 unsigned long stripe_width =
2448 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
3eb08658 2449 int ret;
c9de560d
AT		 2450
2451 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
3eb08658
DE		 2452 ret = sbi->s_stripe;
2453 else if (stripe_width <= sbi->s_blocks_per_group)
2454 ret = stripe_width;
2455 else if (stride <= sbi->s_blocks_per_group)
2456 ret = stride;
2457 else
2458 ret = 0;
c9de560d 2459
3eb08658
DE		 2460 /*
2461 * If the stripe width is 1, this makes no sense and
2462 * we set it to 0 to turn off stripe handling code.
2463 */
2464 if (ret <= 1)
2465 ret = 0;
c9de560d 2466
3eb08658 2467 return ret;
c9de560d 2468}
ac27a0ec 2469
a13fb1a4
ES		 2470/*
2471 * Check whether this filesystem can be mounted based on
2472 * the features present and the RDONLY/RDWR mount requested.
2473 * Returns 1 if this filesystem can be mounted as requested,
2474 * 0 if it cannot be.
2475 */
2476static int ext4_feature_set_ok(struct super_block *sb, int readonly)
2477{
e2b911c5 2478 if (ext4_has_unknown_ext4_incompat_features(sb)) {
a13fb1a4
ES		 2479 ext4_msg(sb, KERN_ERR,
2480 "Couldn't mount because of "
2481 "unsupported optional features (%x)",
2482 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
2483 ~EXT4_FEATURE_INCOMPAT_SUPP));
2484 return 0;
2485 }
2486
2487 if (readonly)
2488 return 1;
2489
e2b911c5 2490 if (ext4_has_feature_readonly(sb)) {
2cb5cc8b
DW		 2491 ext4_msg(sb, KERN_INFO, "filesystem is read-only");
2492 sb->s_flags |= MS_RDONLY;
2493 return 1;
2494 }
2495
a13fb1a4 2496 /* Check that feature set is OK for a read-write mount */
e2b911c5 2497 if (ext4_has_unknown_ext4_ro_compat_features(sb)) {
a13fb1a4
ES		 2498 ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of "
2499 "unsupported optional features (%x)",
2500 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
2501 ~EXT4_FEATURE_RO_COMPAT_SUPP));
2502 return 0;
2503 }
2504 /*
2505 * Large file size enabled file system can only be mounted
2506 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
2507 */
e2b911c5 2508 if (ext4_has_feature_huge_file(sb)) {
a13fb1a4
ES		 2509 if (sizeof(blkcnt_t) < sizeof(u64)) {
2510 ext4_msg(sb, KERN_ERR, "Filesystem with huge files "
2511 "cannot be mounted RDWR without "
2512 "CONFIG_LBDAF");
2513 return 0;
2514 }
2515 }
e2b911c5 2516 if (ext4_has_feature_bigalloc(sb) && !ext4_has_feature_extents(sb)) {
bab08ab9
TT		 2517 ext4_msg(sb, KERN_ERR,
2518 "Can't support bigalloc feature without "
2519 "extents feature\n");
2520 return 0;
2521 }
7c319d32
AK		 2522
2523#ifndef CONFIG_QUOTA
e2b911c5 2524 if (ext4_has_feature_quota(sb) && !readonly) {
7c319d32
AK		 2525 ext4_msg(sb, KERN_ERR,
2526 "Filesystem with quota feature cannot be mounted RDWR "
2527 "without CONFIG_QUOTA");
2528 return 0;
2529 }
2530#endif /* CONFIG_QUOTA */
a13fb1a4
ES		 2531 return 1;
2532}
2533
66e61a9e
TT		 2534/*
2535 * This function is called once a day if we have errors logged
2536 * on the file system
2537 */
2538static void print_daily_error_info(unsigned long arg)
2539{
2540 struct super_block *sb = (struct super_block *) arg;
2541 struct ext4_sb_info *sbi;
2542 struct ext4_super_block *es;
2543
2544 sbi = EXT4_SB(sb);
2545 es = sbi->s_es;
2546
2547 if (es->s_error_count)
ae0f78de
TT		 2548 /* fsck newer than v1.41.13 is needed to clean this condition. */
2549 ext4_msg(sb, KERN_NOTICE, "error count since last fsck: %u",
66e61a9e
TT		 2550 le32_to_cpu(es->s_error_count));
2551 if (es->s_first_error_time) {
ae0f78de 2552 printk(KERN_NOTICE "EXT4-fs (%s): initial error at time %u: %.*s:%d",
66e61a9e
TT		 2553 sb->s_id, le32_to_cpu(es->s_first_error_time),
2554 (int) sizeof(es->s_first_error_func),
2555 es->s_first_error_func,
2556 le32_to_cpu(es->s_first_error_line));
2557 if (es->s_first_error_ino)
2558 printk(": inode %u",
2559 le32_to_cpu(es->s_first_error_ino));
2560 if (es->s_first_error_block)
2561 printk(": block %llu", (unsigned long long)
2562 le64_to_cpu(es->s_first_error_block));
2563 printk("\n");
2564 }
2565 if (es->s_last_error_time) {
ae0f78de 2566 printk(KERN_NOTICE "EXT4-fs (%s): last error at time %u: %.*s:%d",
66e61a9e
TT		 2567 sb->s_id, le32_to_cpu(es->s_last_error_time),
2568 (int) sizeof(es->s_last_error_func),
2569 es->s_last_error_func,
2570 le32_to_cpu(es->s_last_error_line));
2571 if (es->s_last_error_ino)
2572 printk(": inode %u",
2573 le32_to_cpu(es->s_last_error_ino));
2574 if (es->s_last_error_block)
2575 printk(": block %llu", (unsigned long long)
2576 le64_to_cpu(es->s_last_error_block));
2577 printk("\n");
2578 }
2579 mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ); /* Once a day */
2580}
2581
bfff6873
LC		 2582/* Find next suitable group and run ext4_init_inode_table */
2583static int ext4_run_li_request(struct ext4_li_request *elr)
2584{
2585 struct ext4_group_desc *gdp = NULL;
2586 ext4_group_t group, ngroups;
2587 struct super_block *sb;
2588 unsigned long timeout = 0;
2589 int ret = 0;
2590
2591 sb = elr->lr_super;
2592 ngroups = EXT4_SB(sb)->s_groups_count;
2593
8e8ad8a5 2594 sb_start_write(sb);
bfff6873
LC		 2595 for (group = elr->lr_next_group; group < ngroups; group++) {
2596 gdp = ext4_get_group_desc(sb, group, NULL);
2597 if (!gdp) {
2598 ret = 1;
2599 break;
2600 }
2601
2602 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2603 break;
2604 }
2605
7f511862 2606 if (group >= ngroups)
bfff6873
LC		 2607 ret = 1;
2608
2609 if (!ret) {
2610 timeout = jiffies;
2611 ret = ext4_init_inode_table(sb, group,
2612 elr->lr_timeout ? 0 : 1);
2613 if (elr->lr_timeout == 0) {
51ce6511
LC		 2614 timeout = (jiffies - timeout) *
2615 elr->lr_sbi->s_li_wait_mult;
bfff6873
LC		 2616 elr->lr_timeout = timeout;
2617 }
2618 elr->lr_next_sched = jiffies + elr->lr_timeout;
2619 elr->lr_next_group = group + 1;
2620 }
8e8ad8a5 2621 sb_end_write(sb);
bfff6873
LC		 2622
2623 return ret;
2624}
2625
2626/*
2627 * Remove lr_request from the list_request and free the
4ed5c033 2628 * request structure. Should be called with li_list_mtx held
bfff6873
LC		 2629 */
2630static void ext4_remove_li_request(struct ext4_li_request *elr)
2631{
2632 struct ext4_sb_info *sbi;
2633
2634 if (!elr)
2635 return;
2636
2637 sbi = elr->lr_sbi;
2638
2639 list_del(&elr->lr_request);
2640 sbi->s_li_request = NULL;
2641 kfree(elr);
2642}
2643
2644static void ext4_unregister_li_request(struct super_block *sb)
2645{
1bb933fb
LC		 2646 mutex_lock(&ext4_li_mtx);
2647 if (!ext4_li_info) {
2648 mutex_unlock(&ext4_li_mtx);
bfff6873 2649 return;
1bb933fb 2650 }
bfff6873
LC		 2651
2652 mutex_lock(&ext4_li_info->li_list_mtx);
1bb933fb 2653 ext4_remove_li_request(EXT4_SB(sb)->s_li_request);
bfff6873 2654 mutex_unlock(&ext4_li_info->li_list_mtx);
1bb933fb 2655 mutex_unlock(&ext4_li_mtx);
bfff6873
LC		 2656}
2657
8f1f7453
ES		 2658static struct task_struct *ext4_lazyinit_task;
2659
bfff6873
LC		 2660/*
2661 * This is the function where ext4lazyinit thread lives. It walks
2662 * through the request list searching for next scheduled filesystem.
2663 * When such a fs is found, run the lazy initialization request
2664 * (ext4_rn_li_request) and keep track of the time spend in this
2665 * function. Based on that time we compute next schedule time of
2666 * the request. When walking through the list is complete, compute
2667 * next waking time and put itself into sleep.
2668 */
2669static int ext4_lazyinit_thread(void *arg)
2670{
2671 struct ext4_lazy_init *eli = (struct ext4_lazy_init *)arg;
2672 struct list_head *pos, *n;
2673 struct ext4_li_request *elr;
4ed5c033 2674 unsigned long next_wakeup, cur;
bfff6873
LC		 2675
2676 BUG_ON(NULL == eli);
2677
bfff6873
LC		 2678cont_thread:
2679 while (true) {
2680 next_wakeup = MAX_JIFFY_OFFSET;
2681
2682 mutex_lock(&eli->li_list_mtx);
2683 if (list_empty(&eli->li_request_list)) {
2684 mutex_unlock(&eli->li_list_mtx);
2685 goto exit_thread;
2686 }
2687
2688 list_for_each_safe(pos, n, &eli->li_request_list) {
2689 elr = list_entry(pos, struct ext4_li_request,
2690 lr_request);
2691
b2c78cd0
TT		 2692 if (time_after_eq(jiffies, elr->lr_next_sched)) {
2693 if (ext4_run_li_request(elr) != 0) {
2694 /* error, remove the lazy_init job */
2695 ext4_remove_li_request(elr);
2696 continue;
2697 }
bfff6873
LC		 2698 }
2699
2700 if (time_before(elr->lr_next_sched, next_wakeup))
2701 next_wakeup = elr->lr_next_sched;
2702 }
2703 mutex_unlock(&eli->li_list_mtx);
2704
a0acae0e 2705 try_to_freeze();
bfff6873 2706
4ed5c033
LC		 2707 cur = jiffies;
2708 if ((time_after_eq(cur, next_wakeup)) ||
f4245bd4 2709 (MAX_JIFFY_OFFSET == next_wakeup)) {
bfff6873
LC		 2710 cond_resched();
2711 continue;
2712 }
2713
4ed5c033
LC		 2714 schedule_timeout_interruptible(next_wakeup - cur);
2715
8f1f7453
ES		 2716 if (kthread_should_stop()) {
2717 ext4_clear_request_list();
2718 goto exit_thread;
2719 }
bfff6873
LC		 2720 }
2721
2722exit_thread:
2723 /*
2724 * It looks like the request list is empty, but we need
2725 * to check it under the li_list_mtx lock, to prevent any
2726 * additions into it, and of course we should lock ext4_li_mtx
2727 * to atomically free the list and ext4_li_info, because at
2728 * this point another ext4 filesystem could be registering
2729 * new one.
2730 */
2731 mutex_lock(&ext4_li_mtx);
2732 mutex_lock(&eli->li_list_mtx);
2733 if (!list_empty(&eli->li_request_list)) {
2734 mutex_unlock(&eli->li_list_mtx);
2735 mutex_unlock(&ext4_li_mtx);
2736 goto cont_thread;
2737 }
2738 mutex_unlock(&eli->li_list_mtx);
bfff6873
LC		 2739 kfree(ext4_li_info);
2740 ext4_li_info = NULL;
2741 mutex_unlock(&ext4_li_mtx);
2742
2743 return 0;
2744}
2745
2746static void ext4_clear_request_list(void)
2747{
2748 struct list_head *pos, *n;
2749 struct ext4_li_request *elr;
2750
2751 mutex_lock(&ext4_li_info->li_list_mtx);
bfff6873
LC		 2752 list_for_each_safe(pos, n, &ext4_li_info->li_request_list) {
2753 elr = list_entry(pos, struct ext4_li_request,
2754 lr_request);
2755 ext4_remove_li_request(elr);
2756 }
2757 mutex_unlock(&ext4_li_info->li_list_mtx);
2758}
2759
2760static int ext4_run_lazyinit_thread(void)
2761{
8f1f7453
ES		 2762 ext4_lazyinit_task = kthread_run(ext4_lazyinit_thread,
2763 ext4_li_info, "ext4lazyinit");
2764 if (IS_ERR(ext4_lazyinit_task)) {
2765 int err = PTR_ERR(ext4_lazyinit_task);
bfff6873 2766 ext4_clear_request_list();
bfff6873
LC		 2767 kfree(ext4_li_info);
2768 ext4_li_info = NULL;
92b97816 2769 printk(KERN_CRIT "EXT4-fs: error %d creating inode table "
bfff6873
LC		 2770 "initialization thread\n",
2771 err);
2772 return err;
2773 }
2774 ext4_li_info->li_state |= EXT4_LAZYINIT_RUNNING;
bfff6873
LC		 2775 return 0;
2776}
2777
2778/*
2779 * Check whether it make sense to run itable init. thread or not.
2780 * If there is at least one uninitialized inode table, return
2781 * corresponding group number, else the loop goes through all
2782 * groups and return total number of groups.
2783 */
2784static ext4_group_t ext4_has_uninit_itable(struct super_block *sb)
2785{
2786 ext4_group_t group, ngroups = EXT4_SB(sb)->s_groups_count;
2787 struct ext4_group_desc *gdp = NULL;
2788
2789 for (group = 0; group < ngroups; group++) {
2790 gdp = ext4_get_group_desc(sb, group, NULL);
2791 if (!gdp)
2792 continue;
2793
2794 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2795 break;
2796 }
2797
2798 return group;
2799}
2800
2801static int ext4_li_info_new(void)
2802{
2803 struct ext4_lazy_init *eli = NULL;
2804
2805 eli = kzalloc(sizeof(*eli), GFP_KERNEL);
2806 if (!eli)
2807 return -ENOMEM;
2808
bfff6873
LC		 2809 INIT_LIST_HEAD(&eli->li_request_list);
2810 mutex_init(&eli->li_list_mtx);
2811
bfff6873
LC		 2812 eli->li_state |= EXT4_LAZYINIT_QUIT;
2813
2814 ext4_li_info = eli;
2815
2816 return 0;
2817}
2818
2819static struct ext4_li_request *ext4_li_request_new(struct super_block *sb,
2820 ext4_group_t start)
2821{
2822 struct ext4_sb_info *sbi = EXT4_SB(sb);
2823 struct ext4_li_request *elr;
bfff6873
LC		 2824
2825 elr = kzalloc(sizeof(*elr), GFP_KERNEL);
2826 if (!elr)
2827 return NULL;
2828
2829 elr->lr_super = sb;
2830 elr->lr_sbi = sbi;
2831 elr->lr_next_group = start;
2832
2833 /*
2834 * Randomize first schedule time of the request to
2835 * spread the inode table initialization requests
2836 * better.
2837 */
dd1f723b
TT		 2838 elr->lr_next_sched = jiffies + (prandom_u32() %
2839 (EXT4_DEF_LI_MAX_START_DELAY * HZ));
bfff6873
LC		 2840 return elr;
2841}
2842
7f511862
TT		 2843int ext4_register_li_request(struct super_block *sb,
2844 ext4_group_t first_not_zeroed)
bfff6873
LC		 2845{
2846 struct ext4_sb_info *sbi = EXT4_SB(sb);
7f511862 2847 struct ext4_li_request *elr = NULL;
bfff6873 2848 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
6c5a6cb9 2849 int ret = 0;
bfff6873 2850
7f511862 2851 mutex_lock(&ext4_li_mtx);
51ce6511
LC		 2852 if (sbi->s_li_request != NULL) {
2853 /*
2854 * Reset timeout so it can be computed again, because
2855 * s_li_wait_mult might have changed.
2856 */
2857 sbi->s_li_request->lr_timeout = 0;
7f511862 2858 goto out;
51ce6511 2859 }
bfff6873
LC		 2860
2861 if (first_not_zeroed == ngroups ||
2862 (sb->s_flags & MS_RDONLY) ||
55ff3840 2863 !test_opt(sb, INIT_INODE_TABLE))
7f511862 2864 goto out;
bfff6873
LC		 2865
2866 elr = ext4_li_request_new(sb, first_not_zeroed);
7f511862
TT		 2867 if (!elr) {
2868 ret = -ENOMEM;
2869 goto out;
2870 }
bfff6873
LC		 2871
2872 if (NULL == ext4_li_info) {
2873 ret = ext4_li_info_new();
2874 if (ret)
2875 goto out;
2876 }
2877
2878 mutex_lock(&ext4_li_info->li_list_mtx);
2879 list_add(&elr->lr_request, &ext4_li_info->li_request_list);
2880 mutex_unlock(&ext4_li_info->li_list_mtx);
2881
2882 sbi->s_li_request = elr;
46e4690b
TM		 2883 /*
2884 * set elr to NULL here since it has been inserted to
2885 * the request_list and the removal and free of it is
2886 * handled by ext4_clear_request_list from now on.
2887 */
2888 elr = NULL;
bfff6873
LC		 2889
2890 if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) {
2891 ret = ext4_run_lazyinit_thread();
2892 if (ret)
2893 goto out;
2894 }
bfff6873 2895out:
beed5ecb
NK		 2896 mutex_unlock(&ext4_li_mtx);
2897 if (ret)
bfff6873 2898 kfree(elr);
bfff6873
LC		 2899 return ret;
2900}
2901
2902/*
2903 * We do not need to lock anything since this is called on
2904 * module unload.
2905 */
2906static void ext4_destroy_lazyinit_thread(void)
2907{
2908 /*
2909 * If thread exited earlier
2910 * there's nothing to be done.
2911 */
8f1f7453 2912 if (!ext4_li_info || !ext4_lazyinit_task)
bfff6873
LC		 2913 return;
2914
8f1f7453 2915 kthread_stop(ext4_lazyinit_task);
bfff6873
LC		 2916}
2917
25ed6e8a
DW		 2918static int set_journal_csum_feature_set(struct super_block *sb)
2919{
2920 int ret = 1;
2921 int compat, incompat;
2922 struct ext4_sb_info *sbi = EXT4_SB(sb);
2923
9aa5d32b 2924 if (ext4_has_metadata_csum(sb)) {
db9ee220 2925 /* journal checksum v3 */
25ed6e8a 2926 compat = 0;
db9ee220 2927 incompat = JBD2_FEATURE_INCOMPAT_CSUM_V3;
25ed6e8a
DW		 2928 } else {
2929 /* journal checksum v1 */
2930 compat = JBD2_FEATURE_COMPAT_CHECKSUM;
2931 incompat = 0;
2932 }
2933
feb8c6d3
DW		 2934 jbd2_journal_clear_features(sbi->s_journal,
2935 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
2936 JBD2_FEATURE_INCOMPAT_CSUM_V3 |
2937 JBD2_FEATURE_INCOMPAT_CSUM_V2);
25ed6e8a
DW		 2938 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
2939 ret = jbd2_journal_set_features(sbi->s_journal,
2940 compat, 0,
2941 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT |
2942 incompat);
2943 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
2944 ret = jbd2_journal_set_features(sbi->s_journal,
2945 compat, 0,
2946 incompat);
2947 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
2948 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
2949 } else {
feb8c6d3
DW		 2950 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
2951 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
25ed6e8a
DW		 2952 }
2953
2954 return ret;
2955}
2956
952fc18e
TT		 2957/*
2958 * Note: calculating the overhead so we can be compatible with
2959 * historical BSD practice is quite difficult in the face of
2960 * clusters/bigalloc. This is because multiple metadata blocks from
2961 * different block group can end up in the same allocation cluster.
2962 * Calculating the exact overhead in the face of clustered allocation
2963 * requires either O(all block bitmaps) in memory or O(number of block
2964 * groups**2) in time. We will still calculate the superblock for
2965 * older file systems --- and if we come across with a bigalloc file
2966 * system with zero in s_overhead_clusters the estimate will be close to
2967 * correct especially for very large cluster sizes --- but for newer
2968 * file systems, it's better to calculate this figure once at mkfs
2969 * time, and store it in the superblock. If the superblock value is
2970 * present (even for non-bigalloc file systems), we will use it.
2971 */
2972static int count_overhead(struct super_block *sb, ext4_group_t grp,
2973 char *buf)
2974{
2975 struct ext4_sb_info *sbi = EXT4_SB(sb);
2976 struct ext4_group_desc *gdp;
2977 ext4_fsblk_t first_block, last_block, b;
2978 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
2979 int s, j, count = 0;
2980
e2b911c5 2981 if (!ext4_has_feature_bigalloc(sb))
0548bbb8
TT		 2982 return (ext4_bg_has_super(sb, grp) + ext4_bg_num_gdb(sb, grp) +
2983 sbi->s_itb_per_group + 2);
2984
952fc18e
TT		 2985 first_block = le32_to_cpu(sbi->s_es->s_first_data_block) +
2986 (grp * EXT4_BLOCKS_PER_GROUP(sb));
2987 last_block = first_block + EXT4_BLOCKS_PER_GROUP(sb) - 1;
2988 for (i = 0; i < ngroups; i++) {
2989 gdp = ext4_get_group_desc(sb, i, NULL);
2990 b = ext4_block_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_bitmap(sb, gdp);
2996 if (b >= first_block && b <= last_block) {
2997 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
2998 count++;
2999 }
3000 b = ext4_inode_table(sb, gdp);
3001 if (b >= first_block && b + sbi->s_itb_per_group <= last_block)
3002 for (j = 0; j < sbi->s_itb_per_group; j++, b++) {
3003 int c = EXT4_B2C(sbi, b - first_block);
3004 ext4_set_bit(c, buf);
3005 count++;
3006 }
3007 if (i != grp)
3008 continue;
3009 s = 0;
3010 if (ext4_bg_has_super(sb, grp)) {
3011 ext4_set_bit(s++, buf);
3012 count++;
3013 }
3014 for (j = ext4_bg_num_gdb(sb, grp); j > 0; j--) {
3015 ext4_set_bit(EXT4_B2C(sbi, s++), buf);
3016 count++;
3017 }
3018 }
3019 if (!count)
3020 return 0;
3021 return EXT4_CLUSTERS_PER_GROUP(sb) -
3022 ext4_count_free(buf, EXT4_CLUSTERS_PER_GROUP(sb) / 8);
3023}
3024
3025/*
3026 * Compute the overhead and stash it in sbi->s_overhead
3027 */
3028int ext4_calculate_overhead(struct super_block *sb)
3029{
3030 struct ext4_sb_info *sbi = EXT4_SB(sb);
3031 struct ext4_super_block *es = sbi->s_es;
3032 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3033 ext4_fsblk_t overhead = 0;
4fdb5543 3034 char *buf = (char *) get_zeroed_page(GFP_NOFS);
952fc18e 3035
952fc18e
TT		 3036 if (!buf)
3037 return -ENOMEM;
3038
3039 /*
3040 * Compute the overhead (FS structures). This is constant
3041 * for a given filesystem unless the number of block groups
3042 * changes so we cache the previous value until it does.
3043 */
3044
3045 /*
3046 * All of the blocks before first_data_block are overhead
3047 */
3048 overhead = EXT4_B2C(sbi, le32_to_cpu(es->s_first_data_block));
3049
3050 /*
3051 * Add the overhead found in each block group
3052 */
3053 for (i = 0; i < ngroups; i++) {
3054 int blks;
3055
3056 blks = count_overhead(sb, i, buf);
3057 overhead += blks;
3058 if (blks)
3059 memset(buf, 0, PAGE_SIZE);
3060 cond_resched();
3061 }
b003b524
ES		 3062 /* Add the internal journal blocks as well */
3063 if (sbi->s_journal && !sbi->journal_bdev)
810da240 3064 overhead += EXT4_NUM_B2C(sbi, sbi->s_journal->j_maxlen);
0875a2b4 3065
952fc18e
TT		 3066 sbi->s_overhead = overhead;
3067 smp_wmb();
3068 free_page((unsigned long) buf);
3069 return 0;
3070}
3071
b5799018 3072static void ext4_set_resv_clusters(struct super_block *sb)
27dd4385
LC		 3073{
3074 ext4_fsblk_t resv_clusters;
b5799018 3075 struct ext4_sb_info *sbi = EXT4_SB(sb);
27dd4385 3076
30fac0f7
JK		 3077 /*
3078 * There's no need to reserve anything when we aren't using extents.
3079 * The space estimates are exact, there are no unwritten extents,
3080 * hole punching doesn't need new metadata... This is needed especially
3081 * to keep ext2/3 backward compatibility.
3082 */
e2b911c5 3083 if (!ext4_has_feature_extents(sb))
b5799018 3084 return;
27dd4385
LC		 3085 /*
3086 * By default we reserve 2% or 4096 clusters, whichever is smaller.
3087 * This should cover the situations where we can not afford to run
3088 * out of space like for example punch hole, or converting
556615dc 3089 * unwritten extents in delalloc path. In most cases such
27dd4385
LC		 3090 * allocation would require 1, or 2 blocks, higher numbers are
3091 * very rare.
3092 */
b5799018
TT		 3093 resv_clusters = (ext4_blocks_count(sbi->s_es) >>
3094 sbi->s_cluster_bits);
27dd4385
LC		 3095
3096 do_div(resv_clusters, 50);
3097 resv_clusters = min_t(ext4_fsblk_t, resv_clusters, 4096);
3098
b5799018 3099 atomic64_set(&sbi->s_resv_clusters, resv_clusters);
27dd4385
LC		 3100}
3101
2b2d6d01 3102static int ext4_fill_super(struct super_block *sb, void *data, int silent)
ac27a0ec 3103{
d4c402d9 3104 char *orig_data = kstrdup(data, GFP_KERNEL);
2b2d6d01 3105 struct buffer_head *bh;
617ba13b
MC		 3106 struct ext4_super_block *es = NULL;
3107 struct ext4_sb_info *sbi;
3108 ext4_fsblk_t block;
3109 ext4_fsblk_t sb_block = get_sb_block(&data);
70bbb3e0 3110 ext4_fsblk_t logical_sb_block;
ac27a0ec 3111 unsigned long offset = 0;
ac27a0ec
DK		 3112 unsigned long journal_devnum = 0;
3113 unsigned long def_mount_opts;
3114 struct inode *root;
0390131b 3115 const char *descr;
dcc7dae3 3116 int ret = -ENOMEM;
281b5995 3117 int blocksize, clustersize;
4ec11028
TT		 3118 unsigned int db_count;
3119 unsigned int i;
281b5995 3120 int needs_recovery, has_huge_files, has_bigalloc;
bd81d8ee 3121 __u64 blocks_count;
07aa2ea1 3122 int err = 0;
b3881f74 3123 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
bfff6873 3124 ext4_group_t first_not_zeroed;
ac27a0ec
DK		 3125
3126 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
3127 if (!sbi)
dcc7dae3 3128 goto out_free_orig;
705895b6
PE		 3129
3130 sbi->s_blockgroup_lock =
3131 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
3132 if (!sbi->s_blockgroup_lock) {
3133 kfree(sbi);
dcc7dae3 3134 goto out_free_orig;
705895b6 3135 }
ac27a0ec 3136 sb->s_fs_info = sbi;
2c0544b2 3137 sbi->s_sb = sb;
240799cd 3138 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
d9c9bef1 3139 sbi->s_sb_block = sb_block;
f613dfcb
TT		 3140 if (sb->s_bdev->bd_part)
3141 sbi->s_sectors_written_start =
3142 part_stat_read(sb->s_bdev->bd_part, sectors[1]);
ac27a0ec 3143
9f6200bb 3144 /* Cleanup superblock name */
ec3904dc 3145 strreplace(sb->s_id, '/', '!');
9f6200bb 3146
07aa2ea1 3147 /* -EINVAL is default */
dcc7dae3 3148 ret = -EINVAL;
617ba13b 3149 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
ac27a0ec 3150 if (!blocksize) {
b31e1552 3151 ext4_msg(sb, KERN_ERR, "unable to set blocksize");
ac27a0ec
DK		 3152 goto out_fail;
3153 }
3154
3155 /*
617ba13b 3156 * The ext4 superblock will not be buffer aligned for other than 1kB
ac27a0ec
DK		 3157 * block sizes. We need to calculate the offset from buffer start.
3158 */
617ba13b 3159 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
70bbb3e0
AM		 3160 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3161 offset = do_div(logical_sb_block, blocksize);
ac27a0ec 3162 } else {
70bbb3e0 3163 logical_sb_block = sb_block;
ac27a0ec
DK		 3164 }
3165
a8ac900b 3166 if (!(bh = sb_bread_unmovable(sb, logical_sb_block))) {
b31e1552 3167 ext4_msg(sb, KERN_ERR, "unable to read superblock");
ac27a0ec
DK		 3168 goto out_fail;
3169 }
3170 /*
3171 * Note: s_es must be initialized as soon as possible because
617ba13b 3172 * some ext4 macro-instructions depend on its value
ac27a0ec 3173 */
2716b802 3174 es = (struct ext4_super_block *) (bh->b_data + offset);
ac27a0ec
DK		 3175 sbi->s_es = es;
3176 sb->s_magic = le16_to_cpu(es->s_magic);
617ba13b
MC		 3177 if (sb->s_magic != EXT4_SUPER_MAGIC)
3178 goto cantfind_ext4;
afc32f7e 3179 sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
ac27a0ec 3180
feb0ab32 3181 /* Warn if metadata_csum and gdt_csum are both set. */
e2b911c5
DW		 3182 if (ext4_has_feature_metadata_csum(sb) &&
3183 ext4_has_feature_gdt_csum(sb))
363307e6 3184 ext4_warning(sb, "metadata_csum and uninit_bg are "
feb0ab32
DW		 3185 "redundant flags; please run fsck.");
3186
d25425f8
DW		 3187 /* Check for a known checksum algorithm */
3188 if (!ext4_verify_csum_type(sb, es)) {
3189 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3190 "unknown checksum algorithm.");
3191 silent = 1;
3192 goto cantfind_ext4;
3193 }
3194
0441984a 3195 /* Load the checksum driver */
e2b911c5 3196 if (ext4_has_feature_metadata_csum(sb)) {
0441984a
DW		 3197 sbi->s_chksum_driver = crypto_alloc_shash("crc32c", 0, 0);
3198 if (IS_ERR(sbi->s_chksum_driver)) {
3199 ext4_msg(sb, KERN_ERR, "Cannot load crc32c driver.");
3200 ret = PTR_ERR(sbi->s_chksum_driver);
3201 sbi->s_chksum_driver = NULL;
3202 goto failed_mount;
3203 }
3204 }
3205
a9c47317
DW		 3206 /* Check superblock checksum */
3207 if (!ext4_superblock_csum_verify(sb, es)) {
3208 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3209 "invalid superblock checksum. Run e2fsck?");
3210 silent = 1;
6a797d27 3211 ret = -EFSBADCRC;
a9c47317
DW		 3212 goto cantfind_ext4;
3213 }
3214
3215 /* Precompute checksum seed for all metadata */
e2b911c5 3216 if (ext4_has_feature_csum_seed(sb))
8c81bd8f
DW		 3217 sbi->s_csum_seed = le32_to_cpu(es->s_checksum_seed);
3218 else if (ext4_has_metadata_csum(sb))
a9c47317
DW		 3219 sbi->s_csum_seed = ext4_chksum(sbi, ~0, es->s_uuid,
3220 sizeof(es->s_uuid));
3221
ac27a0ec
DK		 3222 /* Set defaults before we parse the mount options */
3223 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
fd8c37ec 3224 set_opt(sb, INIT_INODE_TABLE);
617ba13b 3225 if (def_mount_opts & EXT4_DEFM_DEBUG)
fd8c37ec 3226 set_opt(sb, DEBUG);
87f26807 3227 if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
fd8c37ec 3228 set_opt(sb, GRPID);
617ba13b 3229 if (def_mount_opts & EXT4_DEFM_UID16)
fd8c37ec 3230 set_opt(sb, NO_UID32);
ea663336 3231 /* xattr user namespace & acls are now defaulted on */
ea663336 3232 set_opt(sb, XATTR_USER);
03010a33 3233#ifdef CONFIG_EXT4_FS_POSIX_ACL
ea663336 3234 set_opt(sb, POSIX_ACL);
2e7842b8 3235#endif
98c1a759
DW		 3236 /* don't forget to enable journal_csum when metadata_csum is enabled. */
3237 if (ext4_has_metadata_csum(sb))
3238 set_opt(sb, JOURNAL_CHECKSUM);
3239
617ba13b 3240 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
fd8c37ec 3241 set_opt(sb, JOURNAL_DATA);
617ba13b 3242 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
fd8c37ec 3243 set_opt(sb, ORDERED_DATA);
617ba13b 3244 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
fd8c37ec 3245 set_opt(sb, WRITEBACK_DATA);
617ba13b
MC		 3246
3247 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
fd8c37ec 3248 set_opt(sb, ERRORS_PANIC);
bb4f397a 3249 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
fd8c37ec 3250 set_opt(sb, ERRORS_CONT);
bb4f397a 3251 else
fd8c37ec 3252 set_opt(sb, ERRORS_RO);
45f1a9c3
DW		 3253 /* block_validity enabled by default; disable with noblock_validity */
3254 set_opt(sb, BLOCK_VALIDITY);
8b67f04a 3255 if (def_mount_opts & EXT4_DEFM_DISCARD)
fd8c37ec 3256 set_opt(sb, DISCARD);
ac27a0ec 3257
08cefc7a
EB		 3258 sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));
3259 sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid));
30773840
TT		 3260 sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
3261 sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
3262 sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
ac27a0ec 3263
8b67f04a 3264 if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0)
fd8c37ec 3265 set_opt(sb, BARRIER);
ac27a0ec 3266
dd919b98
AK		 3267 /*
3268 * enable delayed allocation by default
3269 * Use -o nodelalloc to turn it off
3270 */
bc0b75f7 3271 if (!IS_EXT3_SB(sb) && !IS_EXT2_SB(sb) &&
8b67f04a 3272 ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0))
fd8c37ec 3273 set_opt(sb, DELALLOC);
dd919b98 3274
51ce6511
LC		 3275 /*
3276 * set default s_li_wait_mult for lazyinit, for the case there is
3277 * no mount option specified.
3278 */
3279 sbi->s_li_wait_mult = EXT4_DEF_LI_WAIT_MULT;
3280
8b67f04a 3281 if (!parse_options((char *) sbi->s_es->s_mount_opts, sb,
661aa520 3282 &journal_devnum, &journal_ioprio, 0)) {
8b67f04a
TT		 3283 ext4_msg(sb, KERN_WARNING,
3284 "failed to parse options in superblock: %s",
3285 sbi->s_es->s_mount_opts);
3286 }
5a916be1 3287 sbi->s_def_mount_opt = sbi->s_mount_opt;
b3881f74 3288 if (!parse_options((char *) data, sb, &journal_devnum,
661aa520 3289 &journal_ioprio, 0))
ac27a0ec
DK		 3290 goto failed_mount;
3291
56889787
TT		 3292 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
3293 printk_once(KERN_WARNING "EXT4-fs: Warning: mounting "
3294 "with data=journal disables delayed "
3295 "allocation and O_DIRECT support!\n");
3296 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
3297 ext4_msg(sb, KERN_ERR, "can't mount with "
3298 "both data=journal and delalloc");
3299 goto failed_mount;
3300 }
3301 if (test_opt(sb, DIOREAD_NOLOCK)) {
3302 ext4_msg(sb, KERN_ERR, "can't mount with "
6ae6514b 3303 "both data=journal and dioread_nolock");
56889787
TT		 3304 goto failed_mount;
3305 }
923ae0ff
RZ		 3306 if (test_opt(sb, DAX)) {
3307 ext4_msg(sb, KERN_ERR, "can't mount with "
3308 "both data=journal and dax");
3309 goto failed_mount;
3310 }
56889787
TT		 3311 if (test_opt(sb, DELALLOC))
3312 clear_opt(sb, DELALLOC);
001e4a87
TH		 3313 } else {
3314 sb->s_iflags |= SB_I_CGROUPWB;
56889787
TT		 3315 }
3316
ac27a0ec 3317 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
482a7425 3318 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec 3319
617ba13b 3320 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
e2b911c5
DW		 3321 (ext4_has_compat_features(sb) ||
3322 ext4_has_ro_compat_features(sb) ||
3323 ext4_has_incompat_features(sb)))
b31e1552
ES		 3324 ext4_msg(sb, KERN_WARNING,
3325 "feature flags set on rev 0 fs, "
3326 "running e2fsck is recommended");
469108ff 3327
ed3654eb
TT		 3328 if (es->s_creator_os == cpu_to_le32(EXT4_OS_HURD)) {
3329 set_opt2(sb, HURD_COMPAT);
e2b911c5 3330 if (ext4_has_feature_64bit(sb)) {
ed3654eb
TT		 3331 ext4_msg(sb, KERN_ERR,
3332 "The Hurd can't support 64-bit file systems");
3333 goto failed_mount;
3334 }
3335 }
3336
2035e776
TT		 3337 if (IS_EXT2_SB(sb)) {
3338 if (ext2_feature_set_ok(sb))
3339 ext4_msg(sb, KERN_INFO, "mounting ext2 file system "
3340 "using the ext4 subsystem");
3341 else {
3342 ext4_msg(sb, KERN_ERR, "couldn't mount as ext2 due "
3343 "to feature incompatibilities");
3344 goto failed_mount;
3345 }
3346 }
3347
3348 if (IS_EXT3_SB(sb)) {
3349 if (ext3_feature_set_ok(sb))
3350 ext4_msg(sb, KERN_INFO, "mounting ext3 file system "
3351 "using the ext4 subsystem");
3352 else {
3353 ext4_msg(sb, KERN_ERR, "couldn't mount as ext3 due "
3354 "to feature incompatibilities");
3355 goto failed_mount;
3356 }
3357 }
3358
ac27a0ec
DK		 3359 /*
3360 * Check feature flags regardless of the revision level, since we
3361 * previously didn't change the revision level when setting the flags,
3362 * so there is a chance incompat flags are set on a rev 0 filesystem.
3363 */
a13fb1a4 3364 if (!ext4_feature_set_ok(sb, (sb->s_flags & MS_RDONLY)))
ac27a0ec 3365 goto failed_mount;
a13fb1a4 3366
261cb20c 3367 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
617ba13b
MC		 3368 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
3369 blocksize > EXT4_MAX_BLOCK_SIZE) {
b31e1552
ES		 3370 ext4_msg(sb, KERN_ERR,
3371 "Unsupported filesystem blocksize %d", blocksize);
ac27a0ec
DK		 3372 goto failed_mount;
3373 }
3374
923ae0ff
RZ		 3375 if (sbi->s_mount_opt & EXT4_MOUNT_DAX) {
3376 if (blocksize != PAGE_SIZE) {
3377 ext4_msg(sb, KERN_ERR,
3378 "error: unsupported blocksize for dax");
3379 goto failed_mount;
3380 }
3381 if (!sb->s_bdev->bd_disk->fops->direct_access) {
3382 ext4_msg(sb, KERN_ERR,
3383 "error: device does not support dax");
3384 goto failed_mount;
3385 }
3386 }
3387
e2b911c5 3388 if (ext4_has_feature_encrypt(sb) && es->s_encryption_level) {
6ddb2447
TT		 3389 ext4_msg(sb, KERN_ERR, "Unsupported encryption level %d",
3390 es->s_encryption_level);
3391 goto failed_mount;
3392 }
3393
ac27a0ec 3394 if (sb->s_blocksize != blocksize) {
ce40733c
AK		 3395 /* Validate the filesystem blocksize */
3396 if (!sb_set_blocksize(sb, blocksize)) {
b31e1552 3397 ext4_msg(sb, KERN_ERR, "bad block size %d",
ce40733c 3398 blocksize);
ac27a0ec
DK		 3399 goto failed_mount;
3400 }
3401
2b2d6d01 3402 brelse(bh);
70bbb3e0
AM		 3403 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3404 offset = do_div(logical_sb_block, blocksize);
a8ac900b 3405 bh = sb_bread_unmovable(sb, logical_sb_block);
ac27a0ec 3406 if (!bh) {
b31e1552
ES		 3407 ext4_msg(sb, KERN_ERR,
3408 "Can't read superblock on 2nd try");
ac27a0ec
DK		 3409 goto failed_mount;
3410 }
2716b802 3411 es = (struct ext4_super_block *)(bh->b_data + offset);
ac27a0ec 3412 sbi->s_es = es;
617ba13b 3413 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
b31e1552
ES		 3414 ext4_msg(sb, KERN_ERR,
3415 "Magic mismatch, very weird!");
ac27a0ec
DK		 3416 goto failed_mount;
3417 }
3418 }
3419
e2b911c5 3420 has_huge_files = ext4_has_feature_huge_file(sb);
f287a1a5
TT		 3421 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
3422 has_huge_files);
3423 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
ac27a0ec 3424
617ba13b
MC		 3425 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
3426 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
3427 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
ac27a0ec
DK		 3428 } else {
3429 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
3430 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
617ba13b 3431 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
1330593e 3432 (!is_power_of_2(sbi->s_inode_size)) ||
ac27a0ec 3433 (sbi->s_inode_size > blocksize)) {
b31e1552
ES		 3434 ext4_msg(sb, KERN_ERR,
3435 "unsupported inode size: %d",
2b2d6d01 3436 sbi->s_inode_size);
ac27a0ec
DK		 3437 goto failed_mount;
3438 }
ef7f3835
KS		 3439 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
3440 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
ac27a0ec 3441 }
0b8e58a1 3442
0d1ee42f 3443 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
e2b911c5 3444 if (ext4_has_feature_64bit(sb)) {
8fadc143 3445 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
0d1ee42f 3446 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
d8ea6cf8 3447 !is_power_of_2(sbi->s_desc_size)) {
b31e1552
ES		 3448 ext4_msg(sb, KERN_ERR,
3449 "unsupported descriptor size %lu",
0d1ee42f
AR		 3450 sbi->s_desc_size);
3451 goto failed_mount;
3452 }
3453 } else
3454 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
0b8e58a1 3455
ac27a0ec 3456 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
ac27a0ec 3457 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
b47b6f38 3458 if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
617ba13b 3459 goto cantfind_ext4;
0b8e58a1 3460
617ba13b 3461 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
ac27a0ec 3462 if (sbi->s_inodes_per_block == 0)
617ba13b 3463 goto cantfind_ext4;
ac27a0ec
DK		 3464 sbi->s_itb_per_group = sbi->s_inodes_per_group /
3465 sbi->s_inodes_per_block;
0d1ee42f 3466 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
ac27a0ec
DK		 3467 sbi->s_sbh = bh;
3468 sbi->s_mount_state = le16_to_cpu(es->s_state);
e57aa839
FW		 3469 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
3470 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
0b8e58a1 3471
2b2d6d01 3472 for (i = 0; i < 4; i++)
ac27a0ec
DK		 3473 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
3474 sbi->s_def_hash_version = es->s_def_hash_version;
e2b911c5 3475 if (ext4_has_feature_dir_index(sb)) {
23301410
TT		 3476 i = le32_to_cpu(es->s_flags);
3477 if (i & EXT2_FLAGS_UNSIGNED_HASH)
3478 sbi->s_hash_unsigned = 3;
3479 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
f99b2589 3480#ifdef __CHAR_UNSIGNED__
23301410
TT		 3481 if (!(sb->s_flags & MS_RDONLY))
3482 es->s_flags |=
3483 cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
3484 sbi->s_hash_unsigned = 3;
f99b2589 3485#else
23301410
TT		 3486 if (!(sb->s_flags & MS_RDONLY))
3487 es->s_flags |=
3488 cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
f99b2589 3489#endif
23301410 3490 }
f99b2589 3491 }
ac27a0ec 3492
281b5995
TT		 3493 /* Handle clustersize */
3494 clustersize = BLOCK_SIZE << le32_to_cpu(es->s_log_cluster_size);
e2b911c5 3495 has_bigalloc = ext4_has_feature_bigalloc(sb);
281b5995
TT		 3496 if (has_bigalloc) {
3497 if (clustersize < blocksize) {
3498 ext4_msg(sb, KERN_ERR,
3499 "cluster size (%d) smaller than "
3500 "block size (%d)", clustersize, blocksize);
3501 goto failed_mount;
3502 }
3503 sbi->s_cluster_bits = le32_to_cpu(es->s_log_cluster_size) -
3504 le32_to_cpu(es->s_log_block_size);
3505 sbi->s_clusters_per_group =
3506 le32_to_cpu(es->s_clusters_per_group);
3507 if (sbi->s_clusters_per_group > blocksize * 8) {
3508 ext4_msg(sb, KERN_ERR,
3509 "#clusters per group too big: %lu",
3510 sbi->s_clusters_per_group);
3511 goto failed_mount;
3512 }
3513 if (sbi->s_blocks_per_group !=
3514 (sbi->s_clusters_per_group * (clustersize / blocksize))) {
3515 ext4_msg(sb, KERN_ERR, "blocks per group (%lu) and "
3516 "clusters per group (%lu) inconsistent",
3517 sbi->s_blocks_per_group,
3518 sbi->s_clusters_per_group);
3519 goto failed_mount;
3520 }
3521 } else {
3522 if (clustersize != blocksize) {
3523 ext4_warning(sb, "fragment/cluster size (%d) != "
3524 "block size (%d)", clustersize,
3525 blocksize);
3526 clustersize = blocksize;
3527 }
3528 if (sbi->s_blocks_per_group > blocksize * 8) {
3529 ext4_msg(sb, KERN_ERR,
3530 "#blocks per group too big: %lu",
3531 sbi->s_blocks_per_group);
3532 goto failed_mount;
3533 }
3534 sbi->s_clusters_per_group = sbi->s_blocks_per_group;
3535 sbi->s_cluster_bits = 0;
ac27a0ec 3536 }
281b5995
TT		 3537 sbi->s_cluster_ratio = clustersize / blocksize;
3538
ac27a0ec 3539 if (sbi->s_inodes_per_group > blocksize * 8) {
b31e1552
ES		 3540 ext4_msg(sb, KERN_ERR,
3541 "#inodes per group too big: %lu",
2b2d6d01 3542 sbi->s_inodes_per_group);
ac27a0ec
DK		 3543 goto failed_mount;
3544 }
3545
960fd856
TT		 3546 /* Do we have standard group size of clustersize * 8 blocks ? */
3547 if (sbi->s_blocks_per_group == clustersize << 3)
3548 set_opt2(sb, STD_GROUP_SIZE);
3549
bf43d84b
ES		 3550 /*
3551 * Test whether we have more sectors than will fit in sector_t,
3552 * and whether the max offset is addressable by the page cache.
3553 */
5a9ae68a 3554 err = generic_check_addressable(sb->s_blocksize_bits,
30ca22c7 3555 ext4_blocks_count(es));
5a9ae68a 3556 if (err) {
b31e1552 3557 ext4_msg(sb, KERN_ERR, "filesystem"
bf43d84b 3558 " too large to mount safely on this system");
ac27a0ec 3559 if (sizeof(sector_t) < 8)
90c699a9 3560 ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled");
ac27a0ec
DK		 3561 goto failed_mount;
3562 }
3563
617ba13b
MC		 3564 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
3565 goto cantfind_ext4;
e7c95593 3566
0f2ddca6
FTN		 3567 /* check blocks count against device size */
3568 blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
3569 if (blocks_count && ext4_blocks_count(es) > blocks_count) {
b31e1552
ES		 3570 ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
3571 "exceeds size of device (%llu blocks)",
0f2ddca6
FTN		 3572 ext4_blocks_count(es), blocks_count);
3573 goto failed_mount;
3574 }
3575
0b8e58a1
AD		 3576 /*
3577 * It makes no sense for the first data block to be beyond the end
3578 * of the filesystem.
3579 */
3580 if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
5635a62b 3581 ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
b31e1552
ES		 3582 "block %u is beyond end of filesystem (%llu)",
3583 le32_to_cpu(es->s_first_data_block),
3584 ext4_blocks_count(es));
e7c95593
ES		 3585 goto failed_mount;
3586 }
bd81d8ee
LV		 3587 blocks_count = (ext4_blocks_count(es) -
3588 le32_to_cpu(es->s_first_data_block) +
3589 EXT4_BLOCKS_PER_GROUP(sb) - 1);
3590 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
4ec11028 3591 if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
b31e1552 3592 ext4_msg(sb, KERN_WARNING, "groups count too large: %u "
4ec11028 3593 "(block count %llu, first data block %u, "
b31e1552 3594 "blocks per group %lu)", sbi->s_groups_count,
4ec11028
TT		 3595 ext4_blocks_count(es),
3596 le32_to_cpu(es->s_first_data_block),
3597 EXT4_BLOCKS_PER_GROUP(sb));
3598 goto failed_mount;
3599 }
bd81d8ee 3600 sbi->s_groups_count = blocks_count;
fb0a387d
ES		 3601 sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
3602 (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
617ba13b
MC		 3603 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
3604 EXT4_DESC_PER_BLOCK(sb);
f18a5f21
TT		 3605 sbi->s_group_desc = ext4_kvmalloc(db_count *
3606 sizeof(struct buffer_head *),
3607 GFP_KERNEL);
ac27a0ec 3608 if (sbi->s_group_desc == NULL) {
b31e1552 3609 ext4_msg(sb, KERN_ERR, "not enough memory");
2cde417d 3610 ret = -ENOMEM;
ac27a0ec
DK		 3611 goto failed_mount;
3612 }
3613
705895b6 3614 bgl_lock_init(sbi->s_blockgroup_lock);
ac27a0ec
DK		 3615
3616 for (i = 0; i < db_count; i++) {
70bbb3e0 3617 block = descriptor_loc(sb, logical_sb_block, i);
a8ac900b 3618 sbi->s_group_desc[i] = sb_bread_unmovable(sb, block);
ac27a0ec 3619 if (!sbi->s_group_desc[i]) {
b31e1552
ES		 3620 ext4_msg(sb, KERN_ERR,
3621 "can't read group descriptor %d", i);
ac27a0ec
DK		 3622 db_count = i;
3623 goto failed_mount2;
3624 }
3625 }
bfff6873 3626 if (!ext4_check_descriptors(sb, &first_not_zeroed)) {
b31e1552 3627 ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
6a797d27 3628 ret = -EFSCORRUPTED;
f9ae9cf5 3629 goto failed_mount2;
ac27a0ec 3630 }
772cb7c8 3631
f9ae9cf5 3632 sbi->s_gdb_count = db_count;
ac27a0ec
DK		 3633 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
3634 spin_lock_init(&sbi->s_next_gen_lock);
3635
04ecddb7
JM		 3636 setup_timer(&sbi->s_err_report, print_daily_error_info,
3637 (unsigned long) sb);
04496411 3638
a75ae78f 3639 /* Register extent status tree shrinker */
eb68d0e2 3640 if (ext4_es_register_shrinker(sbi))
ce7e010a 3641 goto failed_mount3;
ce7e010a 3642
c9de560d 3643 sbi->s_stripe = ext4_get_stripe_size(sbi);
67a5da56 3644 sbi->s_extent_max_zeroout_kb = 32;
c9de560d 3645
f9ae9cf5
TT		 3646 /*
3647 * set up enough so that it can read an inode
3648 */
f6e63f90 3649 sb->s_op = &ext4_sops;
617ba13b
MC		 3650 sb->s_export_op = &ext4_export_ops;
3651 sb->s_xattr = ext4_xattr_handlers;
ac27a0ec 3652#ifdef CONFIG_QUOTA
617ba13b 3653 sb->dq_op = &ext4_quota_operations;
e2b911c5 3654 if (ext4_has_feature_quota(sb))
1fa5efe3 3655 sb->s_qcop = &dquot_quotactl_sysfile_ops;
262b4662
JK		 3656 else
3657 sb->s_qcop = &ext4_qctl_operations;
96c7e0d9 3658 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
ac27a0ec 3659#endif
f2fa2ffc
AK		 3660 memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
3661
ac27a0ec 3662 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
3b9d4ed2 3663 mutex_init(&sbi->s_orphan_lock);
ac27a0ec
DK		 3664
3665 sb->s_root = NULL;
3666
3667 needs_recovery = (es->s_last_orphan != 0 ||
e2b911c5 3668 ext4_has_feature_journal_needs_recovery(sb));
ac27a0ec 3669
e2b911c5 3670 if (ext4_has_feature_mmp(sb) && !(sb->s_flags & MS_RDONLY))
c5e06d10 3671 if (ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block)))
50460fe8 3672 goto failed_mount3a;
c5e06d10 3673
ac27a0ec
DK		 3674 /*
3675 * The first inode we look at is the journal inode. Don't try
3676 * root first: it may be modified in the journal!
3677 */
e2b911c5 3678 if (!test_opt(sb, NOLOAD) && ext4_has_feature_journal(sb)) {
617ba13b 3679 if (ext4_load_journal(sb, es, journal_devnum))
50460fe8 3680 goto failed_mount3a;
0390131b 3681 } else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) &&
e2b911c5 3682 ext4_has_feature_journal_needs_recovery(sb)) {
b31e1552
ES		 3683 ext4_msg(sb, KERN_ERR, "required journal recovery "
3684 "suppressed and not mounted read-only");
744692dc 3685 goto failed_mount_wq;
ac27a0ec 3686 } else {
1e381f60
DM		 3687 /* Nojournal mode, all journal mount options are illegal */
3688 if (test_opt2(sb, EXPLICIT_JOURNAL_CHECKSUM)) {
3689 ext4_msg(sb, KERN_ERR, "can't mount with "
3690 "journal_checksum, fs mounted w/o journal");
3691 goto failed_mount_wq;
3692 }
3693 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
3694 ext4_msg(sb, KERN_ERR, "can't mount with "
3695 "journal_async_commit, fs mounted w/o journal");
3696 goto failed_mount_wq;
3697 }
3698 if (sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) {
3699 ext4_msg(sb, KERN_ERR, "can't mount with "
3700 "commit=%lu, fs mounted w/o journal",
3701 sbi->s_commit_interval / HZ);
3702 goto failed_mount_wq;
3703 }
3704 if (EXT4_MOUNT_DATA_FLAGS &
3705 (sbi->s_mount_opt ^ sbi->s_def_mount_opt)) {
3706 ext4_msg(sb, KERN_ERR, "can't mount with "
3707 "data=, fs mounted w/o journal");
3708 goto failed_mount_wq;
3709 }
3710 sbi->s_def_mount_opt &= EXT4_MOUNT_JOURNAL_CHECKSUM;
3711 clear_opt(sb, JOURNAL_CHECKSUM);
fd8c37ec 3712 clear_opt(sb, DATA_FLAGS);
0390131b
FM		 3713 sbi->s_journal = NULL;
3714 needs_recovery = 0;
3715 goto no_journal;
ac27a0ec
DK		 3716 }
3717
e2b911c5 3718 if (ext4_has_feature_64bit(sb) &&
eb40a09c
JS		 3719 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
3720 JBD2_FEATURE_INCOMPAT_64BIT)) {
b31e1552 3721 ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
744692dc 3722 goto failed_mount_wq;
eb40a09c
JS		 3723 }
3724
25ed6e8a
DW		 3725 if (!set_journal_csum_feature_set(sb)) {
3726 ext4_msg(sb, KERN_ERR, "Failed to set journal checksum "
3727 "feature set");
3728 goto failed_mount_wq;
d4da6c9c 3729 }
818d276c 3730
ac27a0ec
DK		 3731 /* We have now updated the journal if required, so we can
3732 * validate the data journaling mode. */
3733 switch (test_opt(sb, DATA_FLAGS)) {
3734 case 0:
3735 /* No mode set, assume a default based on the journal
63f57933
AM		 3736 * capabilities: ORDERED_DATA if the journal can
3737 * cope, else JOURNAL_DATA
3738 */
dab291af
MC		 3739 if (jbd2_journal_check_available_features
3740 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
fd8c37ec 3741 set_opt(sb, ORDERED_DATA);
ac27a0ec 3742 else
fd8c37ec 3743 set_opt(sb, JOURNAL_DATA);
ac27a0ec
DK		 3744 break;
3745
617ba13b
MC		 3746 case EXT4_MOUNT_ORDERED_DATA:
3747 case EXT4_MOUNT_WRITEBACK_DATA:
dab291af
MC		 3748 if (!jbd2_journal_check_available_features
3749 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
b31e1552
ES		 3750 ext4_msg(sb, KERN_ERR, "Journal does not support "
3751 "requested data journaling mode");
744692dc 3752 goto failed_mount_wq;
ac27a0ec
DK		 3753 }
3754 default:
3755 break;
3756 }
b3881f74 3757 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
ac27a0ec 3758
18aadd47
BJ		 3759 sbi->s_journal->j_commit_callback = ext4_journal_commit_callback;
3760
ce7e010a 3761no_journal:
9c191f70
M		 3762 if (ext4_mballoc_ready) {
3763 sbi->s_mb_cache = ext4_xattr_create_cache(sb->s_id);
3764 if (!sbi->s_mb_cache) {
3765 ext4_msg(sb, KERN_ERR, "Failed to create an mb_cache");
3766 goto failed_mount_wq;
3767 }
3768 }
3769
e2b911c5 3770 if ((DUMMY_ENCRYPTION_ENABLED(sbi) || ext4_has_feature_encrypt(sb)) &&
1cb767cd
TT		 3771 (blocksize != PAGE_CACHE_SIZE)) {
3772 ext4_msg(sb, KERN_ERR,
3773 "Unsupported blocksize for fs encryption");
3774 goto failed_mount_wq;
3775 }
3776
e2b911c5
DW		 3777 if (DUMMY_ENCRYPTION_ENABLED(sbi) && !(sb->s_flags & MS_RDONLY) &&
3778 !ext4_has_feature_encrypt(sb)) {
3779 ext4_set_feature_encrypt(sb);
6ddb2447
TT		 3780 ext4_commit_super(sb, 1);
3781 }
3782
952fc18e
TT		 3783 /*
3784 * Get the # of file system overhead blocks from the
3785 * superblock if present.
3786 */
3787 if (es->s_overhead_clusters)
3788 sbi->s_overhead = le32_to_cpu(es->s_overhead_clusters);
3789 else {
07aa2ea1
LC		 3790 err = ext4_calculate_overhead(sb);
3791 if (err)
952fc18e
TT		 3792 goto failed_mount_wq;
3793 }
3794
fd89d5f2
TH		 3795 /*
3796 * The maximum number of concurrent works can be high and
3797 * concurrency isn't really necessary. Limit it to 1.
3798 */
2e8fa54e
JK		 3799 EXT4_SB(sb)->rsv_conversion_wq =
3800 alloc_workqueue("ext4-rsv-conversion", WQ_MEM_RECLAIM | WQ_UNBOUND, 1);
3801 if (!EXT4_SB(sb)->rsv_conversion_wq) {
3802 printk(KERN_ERR "EXT4-fs: failed to create workqueue\n");
07aa2ea1 3803 ret = -ENOMEM;
2e8fa54e
JK		 3804 goto failed_mount4;
3805 }
3806
ac27a0ec 3807 /*
dab291af 3808 * The jbd2_journal_load will have done any necessary log recovery,
ac27a0ec
DK		 3809 * so we can safely mount the rest of the filesystem now.
3810 */
3811
1d1fe1ee
DH		 3812 root = ext4_iget(sb, EXT4_ROOT_INO);
3813 if (IS_ERR(root)) {
b31e1552 3814 ext4_msg(sb, KERN_ERR, "get root inode failed");
1d1fe1ee 3815 ret = PTR_ERR(root);
32a9bb57 3816 root = NULL;
ac27a0ec
DK		 3817 goto failed_mount4;
3818 }
3819 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
b31e1552 3820 ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
94bf608a 3821 iput(root);
ac27a0ec
DK		 3822 goto failed_mount4;
3823 }
48fde701 3824 sb->s_root = d_make_root(root);
1d1fe1ee 3825 if (!sb->s_root) {
b31e1552 3826 ext4_msg(sb, KERN_ERR, "get root dentry failed");
1d1fe1ee
DH		 3827 ret = -ENOMEM;
3828 goto failed_mount4;
3829 }
ac27a0ec 3830
7e84b621
ES		 3831 if (ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY))
3832 sb->s_flags |= MS_RDONLY;
ef7f3835
KS		 3833
3834 /* determine the minimum size of new large inodes, if present */
3835 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
3836 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
3837 EXT4_GOOD_OLD_INODE_SIZE;
e2b911c5 3838 if (ext4_has_feature_extra_isize(sb)) {
ef7f3835
KS		 3839 if (sbi->s_want_extra_isize <
3840 le16_to_cpu(es->s_want_extra_isize))
3841 sbi->s_want_extra_isize =
3842 le16_to_cpu(es->s_want_extra_isize);
3843 if (sbi->s_want_extra_isize <
3844 le16_to_cpu(es->s_min_extra_isize))
3845 sbi->s_want_extra_isize =
3846 le16_to_cpu(es->s_min_extra_isize);
3847 }
3848 }
3849 /* Check if enough inode space is available */
3850 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
3851 sbi->s_inode_size) {
3852 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
3853 EXT4_GOOD_OLD_INODE_SIZE;
b31e1552
ES		 3854 ext4_msg(sb, KERN_INFO, "required extra inode space not"
3855 "available");
ef7f3835
KS		 3856 }
3857
b5799018 3858 ext4_set_resv_clusters(sb);
27dd4385 3859
6fd058f7
TT		 3860 err = ext4_setup_system_zone(sb);
3861 if (err) {
b31e1552 3862 ext4_msg(sb, KERN_ERR, "failed to initialize system "
fbe845dd 3863 "zone (%d)", err);
f9ae9cf5
TT		 3864 goto failed_mount4a;
3865 }
3866
3867 ext4_ext_init(sb);
3868 err = ext4_mb_init(sb);
3869 if (err) {
3870 ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)",
3871 err);
dcf2d804 3872 goto failed_mount5;
c2774d84
AK		 3873 }
3874
d5e03cbb
TT		 3875 block = ext4_count_free_clusters(sb);
3876 ext4_free_blocks_count_set(sbi->s_es,
3877 EXT4_C2B(sbi, block));
908c7f19
TH		 3878 err = percpu_counter_init(&sbi->s_freeclusters_counter, block,
3879 GFP_KERNEL);
d5e03cbb
TT		 3880 if (!err) {
3881 unsigned long freei = ext4_count_free_inodes(sb);
3882 sbi->s_es->s_free_inodes_count = cpu_to_le32(freei);
908c7f19
TH		 3883 err = percpu_counter_init(&sbi->s_freeinodes_counter, freei,
3884 GFP_KERNEL);
d5e03cbb
TT		 3885 }
3886 if (!err)
3887 err = percpu_counter_init(&sbi->s_dirs_counter,
908c7f19 3888 ext4_count_dirs(sb), GFP_KERNEL);
d5e03cbb 3889 if (!err)
908c7f19
TH		 3890 err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0,
3891 GFP_KERNEL);
d5e03cbb
TT		 3892 if (err) {
3893 ext4_msg(sb, KERN_ERR, "insufficient memory");
3894 goto failed_mount6;
3895 }
3896
e2b911c5 3897 if (ext4_has_feature_flex_bg(sb))
d5e03cbb
TT		 3898 if (!ext4_fill_flex_info(sb)) {
3899 ext4_msg(sb, KERN_ERR,
3900 "unable to initialize "
3901 "flex_bg meta info!");
3902 goto failed_mount6;
3903 }
3904
bfff6873
LC		 3905 err = ext4_register_li_request(sb, first_not_zeroed);
3906 if (err)
dcf2d804 3907 goto failed_mount6;
bfff6873 3908
b5799018 3909 err = ext4_register_sysfs(sb);
dcf2d804
TM		 3910 if (err)
3911 goto failed_mount7;
3197ebdb 3912
9b2ff357
JK		 3913#ifdef CONFIG_QUOTA
3914 /* Enable quota usage during mount. */
e2b911c5 3915 if (ext4_has_feature_quota(sb) && !(sb->s_flags & MS_RDONLY)) {
9b2ff357
JK		 3916 err = ext4_enable_quotas(sb);
3917 if (err)
3918 goto failed_mount8;
3919 }
3920#endif /* CONFIG_QUOTA */
3921
617ba13b
MC		 3922 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
3923 ext4_orphan_cleanup(sb, es);
3924 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
0390131b 3925 if (needs_recovery) {
b31e1552 3926 ext4_msg(sb, KERN_INFO, "recovery complete");
0390131b
FM		 3927 ext4_mark_recovery_complete(sb, es);
3928 }
3929 if (EXT4_SB(sb)->s_journal) {
3930 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
3931 descr = " journalled data mode";
3932 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
3933 descr = " ordered data mode";
3934 else
3935 descr = " writeback data mode";
3936 } else
3937 descr = "out journal";
3938
79add3a3
LC		 3939 if (test_opt(sb, DISCARD)) {
3940 struct request_queue *q = bdev_get_queue(sb->s_bdev);
3941 if (!blk_queue_discard(q))
3942 ext4_msg(sb, KERN_WARNING,
3943 "mounting with \"discard\" option, but "
3944 "the device does not support discard");
3945 }
3946
e294a537
TT		 3947 if (___ratelimit(&ext4_mount_msg_ratelimit, "EXT4-fs mount"))
3948 ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. "
3949 "Opts: %s%s%s", descr, sbi->s_es->s_mount_opts,
3950 *sbi->s_es->s_mount_opts ? "; " : "", orig_data);
ac27a0ec 3951
66e61a9e
TT		 3952 if (es->s_error_count)
3953 mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */
ac27a0ec 3954
efbed4dc
TT		 3955 /* Enable message ratelimiting. Default is 10 messages per 5 secs. */
3956 ratelimit_state_init(&sbi->s_err_ratelimit_state, 5 * HZ, 10);
3957 ratelimit_state_init(&sbi->s_warning_ratelimit_state, 5 * HZ, 10);
3958 ratelimit_state_init(&sbi->s_msg_ratelimit_state, 5 * HZ, 10);
3959
d4c402d9 3960 kfree(orig_data);
ac27a0ec
DK		 3961 return 0;
3962
617ba13b 3963cantfind_ext4:
ac27a0ec 3964 if (!silent)
b31e1552 3965 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
ac27a0ec
DK		 3966 goto failed_mount;
3967
72ba7450
TT		 3968#ifdef CONFIG_QUOTA
3969failed_mount8:
ebd173be 3970 ext4_unregister_sysfs(sb);
72ba7450 3971#endif
dcf2d804
TM		 3972failed_mount7:
3973 ext4_unregister_li_request(sb);
3974failed_mount6:
f9ae9cf5 3975 ext4_mb_release(sb);
d5e03cbb 3976 if (sbi->s_flex_groups)
b93b41d4 3977 kvfree(sbi->s_flex_groups);
d5e03cbb
TT		 3978 percpu_counter_destroy(&sbi->s_freeclusters_counter);
3979 percpu_counter_destroy(&sbi->s_freeinodes_counter);
3980 percpu_counter_destroy(&sbi->s_dirs_counter);
3981 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
00764937 3982failed_mount5:
f9ae9cf5
TT		 3983 ext4_ext_release(sb);
3984 ext4_release_system_zone(sb);
3985failed_mount4a:
94bf608a 3986 dput(sb->s_root);
32a9bb57 3987 sb->s_root = NULL;
94bf608a 3988failed_mount4:
b31e1552 3989 ext4_msg(sb, KERN_ERR, "mount failed");
2e8fa54e
JK		 3990 if (EXT4_SB(sb)->rsv_conversion_wq)
3991 destroy_workqueue(EXT4_SB(sb)->rsv_conversion_wq);
4c0425ff 3992failed_mount_wq:
0390131b
FM		 3993 if (sbi->s_journal) {
3994 jbd2_journal_destroy(sbi->s_journal);
3995 sbi->s_journal = NULL;
3996 }
50460fe8 3997failed_mount3a:
d3922a77 3998 ext4_es_unregister_shrinker(sbi);
eb68d0e2 3999failed_mount3:
9105bb14 4000 del_timer_sync(&sbi->s_err_report);
c5e06d10
JL		 4001 if (sbi->s_mmp_tsk)
4002 kthread_stop(sbi->s_mmp_tsk);
ac27a0ec
DK		 4003failed_mount2:
4004 for (i = 0; i < db_count; i++)
4005 brelse(sbi->s_group_desc[i]);
b93b41d4 4006 kvfree(sbi->s_group_desc);
ac27a0ec 4007failed_mount:
0441984a
DW		 4008 if (sbi->s_chksum_driver)
4009 crypto_free_shash(sbi->s_chksum_driver);
ac27a0ec 4010#ifdef CONFIG_QUOTA
a2d4a646 4011 for (i = 0; i < EXT4_MAXQUOTAS; i++)
ac27a0ec
DK		 4012 kfree(sbi->s_qf_names[i]);
4013#endif
617ba13b 4014 ext4_blkdev_remove(sbi);
ac27a0ec
DK		 4015 brelse(bh);
4016out_fail:
4017 sb->s_fs_info = NULL;
f6830165 4018 kfree(sbi->s_blockgroup_lock);
ac27a0ec 4019 kfree(sbi);
dcc7dae3 4020out_free_orig:
d4c402d9 4021 kfree(orig_data);
07aa2ea1 4022 return err ? err : ret;
ac27a0ec
DK		 4023}
4024
4025/*
4026 * Setup any per-fs journal parameters now. We'll do this both on
4027 * initial mount, once the journal has been initialised but before we've
4028 * done any recovery; and again on any subsequent remount.
4029 */
617ba13b 4030static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
ac27a0ec 4031{
617ba13b 4032 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4033
30773840
TT		 4034 journal->j_commit_interval = sbi->s_commit_interval;
4035 journal->j_min_batch_time = sbi->s_min_batch_time;
4036 journal->j_max_batch_time = sbi->s_max_batch_time;
ac27a0ec 4037
a931da6a 4038 write_lock(&journal->j_state_lock);
ac27a0ec 4039 if (test_opt(sb, BARRIER))
dab291af 4040 journal->j_flags |= JBD2_BARRIER;
ac27a0ec 4041 else
dab291af 4042 journal->j_flags &= ~JBD2_BARRIER;
5bf5683a
HK		 4043 if (test_opt(sb, DATA_ERR_ABORT))
4044 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
4045 else
4046 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
a931da6a 4047 write_unlock(&journal->j_state_lock);
ac27a0ec
DK		 4048}
4049
617ba13b 4050static journal_t *ext4_get_journal(struct super_block *sb,
ac27a0ec
DK		 4051 unsigned int journal_inum)
4052{
4053 struct inode *journal_inode;
4054 journal_t *journal;
4055
e2b911c5 4056 BUG_ON(!ext4_has_feature_journal(sb));
0390131b 4057
ac27a0ec
DK		 4058 /* First, test for the existence of a valid inode on disk. Bad
4059 * things happen if we iget() an unused inode, as the subsequent
4060 * iput() will try to delete it. */
4061
1d1fe1ee
DH		 4062 journal_inode = ext4_iget(sb, journal_inum);
4063 if (IS_ERR(journal_inode)) {
b31e1552 4064 ext4_msg(sb, KERN_ERR, "no journal found");
ac27a0ec
DK		 4065 return NULL;
4066 }
4067 if (!journal_inode->i_nlink) {
4068 make_bad_inode(journal_inode);
4069 iput(journal_inode);
b31e1552 4070 ext4_msg(sb, KERN_ERR, "journal inode is deleted");
ac27a0ec
DK		 4071 return NULL;
4072 }
4073
e5f8eab8 4074 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
ac27a0ec 4075 journal_inode, journal_inode->i_size);
1d1fe1ee 4076 if (!S_ISREG(journal_inode->i_mode)) {
b31e1552 4077 ext4_msg(sb, KERN_ERR, "invalid journal inode");
ac27a0ec
DK		 4078 iput(journal_inode);
4079 return NULL;
4080 }
4081
dab291af 4082 journal = jbd2_journal_init_inode(journal_inode);
ac27a0ec 4083 if (!journal) {
b31e1552 4084 ext4_msg(sb, KERN_ERR, "Could not load journal inode");
ac27a0ec
DK		 4085 iput(journal_inode);
4086 return NULL;
4087 }
4088 journal->j_private = sb;
617ba13b 4089 ext4_init_journal_params(sb, journal);
ac27a0ec
DK		 4090 return journal;
4091}
4092
617ba13b 4093static journal_t *ext4_get_dev_journal(struct super_block *sb,
ac27a0ec
DK		 4094 dev_t j_dev)
4095{
2b2d6d01 4096 struct buffer_head *bh;
ac27a0ec 4097 journal_t *journal;
617ba13b
MC		 4098 ext4_fsblk_t start;
4099 ext4_fsblk_t len;
ac27a0ec 4100 int hblock, blocksize;
617ba13b 4101 ext4_fsblk_t sb_block;
ac27a0ec 4102 unsigned long offset;
2b2d6d01 4103 struct ext4_super_block *es;
ac27a0ec
DK		 4104 struct block_device *bdev;
4105
e2b911c5 4106 BUG_ON(!ext4_has_feature_journal(sb));
0390131b 4107
b31e1552 4108 bdev = ext4_blkdev_get(j_dev, sb);
ac27a0ec
DK		 4109 if (bdev == NULL)
4110 return NULL;
4111
ac27a0ec 4112 blocksize = sb->s_blocksize;
e1defc4f 4113 hblock = bdev_logical_block_size(bdev);
ac27a0ec 4114 if (blocksize < hblock) {
b31e1552
ES		 4115 ext4_msg(sb, KERN_ERR,
4116 "blocksize too small for journal device");
ac27a0ec
DK		 4117 goto out_bdev;
4118 }
4119
617ba13b
MC		 4120 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
4121 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
ac27a0ec
DK		 4122 set_blocksize(bdev, blocksize);
4123 if (!(bh = __bread(bdev, sb_block, blocksize))) {
b31e1552
ES		 4124 ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
4125 "external journal");
ac27a0ec
DK		 4126 goto out_bdev;
4127 }
4128
2716b802 4129 es = (struct ext4_super_block *) (bh->b_data + offset);
617ba13b 4130 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
ac27a0ec 4131 !(le32_to_cpu(es->s_feature_incompat) &
617ba13b 4132 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
b31e1552
ES		 4133 ext4_msg(sb, KERN_ERR, "external journal has "
4134 "bad superblock");
ac27a0ec
DK		 4135 brelse(bh);
4136 goto out_bdev;
4137 }
4138
df4763be
DW		 4139 if ((le32_to_cpu(es->s_feature_ro_compat) &
4140 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) &&
4141 es->s_checksum != ext4_superblock_csum(sb, es)) {
4142 ext4_msg(sb, KERN_ERR, "external journal has "
4143 "corrupt superblock");
4144 brelse(bh);
4145 goto out_bdev;
4146 }
4147
617ba13b 4148 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
b31e1552 4149 ext4_msg(sb, KERN_ERR, "journal UUID does not match");
ac27a0ec
DK		 4150 brelse(bh);
4151 goto out_bdev;
4152 }
4153
bd81d8ee 4154 len = ext4_blocks_count(es);
ac27a0ec
DK		 4155 start = sb_block + 1;
4156 brelse(bh); /* we're done with the superblock */
4157
dab291af 4158 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
ac27a0ec
DK		 4159 start, len, blocksize);
4160 if (!journal) {
b31e1552 4161 ext4_msg(sb, KERN_ERR, "failed to create device journal");
ac27a0ec
DK		 4162 goto out_bdev;
4163 }
4164 journal->j_private = sb;
9f203507 4165 ll_rw_block(READ | REQ_META | REQ_PRIO, 1, &journal->j_sb_buffer);
ac27a0ec
DK		 4166 wait_on_buffer(journal->j_sb_buffer);
4167 if (!buffer_uptodate(journal->j_sb_buffer)) {
b31e1552 4168 ext4_msg(sb, KERN_ERR, "I/O error on journal device");
ac27a0ec
DK		 4169 goto out_journal;
4170 }
4171 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
b31e1552
ES		 4172 ext4_msg(sb, KERN_ERR, "External journal has more than one "
4173 "user (unsupported) - %d",
ac27a0ec
DK		 4174 be32_to_cpu(journal->j_superblock->s_nr_users));
4175 goto out_journal;
4176 }
617ba13b
MC		 4177 EXT4_SB(sb)->journal_bdev = bdev;
4178 ext4_init_journal_params(sb, journal);
ac27a0ec 4179 return journal;
0b8e58a1 4180
ac27a0ec 4181out_journal:
dab291af 4182 jbd2_journal_destroy(journal);
ac27a0ec 4183out_bdev:
617ba13b 4184 ext4_blkdev_put(bdev);
ac27a0ec
DK		 4185 return NULL;
4186}
4187
617ba13b
MC		 4188static int ext4_load_journal(struct super_block *sb,
4189 struct ext4_super_block *es,
ac27a0ec
DK		 4190 unsigned long journal_devnum)
4191{
4192 journal_t *journal;
4193 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
4194 dev_t journal_dev;
4195 int err = 0;
4196 int really_read_only;
4197
e2b911c5 4198 BUG_ON(!ext4_has_feature_journal(sb));
0390131b 4199
ac27a0ec
DK		 4200 if (journal_devnum &&
4201 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
b31e1552
ES		 4202 ext4_msg(sb, KERN_INFO, "external journal device major/minor "
4203 "numbers have changed");
ac27a0ec
DK		 4204 journal_dev = new_decode_dev(journal_devnum);
4205 } else
4206 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
4207
4208 really_read_only = bdev_read_only(sb->s_bdev);
4209
4210 /*
4211 * Are we loading a blank journal or performing recovery after a
4212 * crash? For recovery, we need to check in advance whether we
4213 * can get read-write access to the device.
4214 */
e2b911c5 4215 if (ext4_has_feature_journal_needs_recovery(sb)) {
ac27a0ec 4216 if (sb->s_flags & MS_RDONLY) {
b31e1552
ES		 4217 ext4_msg(sb, KERN_INFO, "INFO: recovery "
4218 "required on readonly filesystem");
ac27a0ec 4219 if (really_read_only) {
b31e1552
ES		 4220 ext4_msg(sb, KERN_ERR, "write access "
4221 "unavailable, cannot proceed");
ac27a0ec
DK		 4222 return -EROFS;
4223 }
b31e1552
ES		 4224 ext4_msg(sb, KERN_INFO, "write access will "
4225 "be enabled during recovery");
ac27a0ec
DK		 4226 }
4227 }
4228
4229 if (journal_inum && journal_dev) {
b31e1552
ES		 4230 ext4_msg(sb, KERN_ERR, "filesystem has both journal "
4231 "and inode journals!");
ac27a0ec
DK		 4232 return -EINVAL;
4233 }
4234
4235 if (journal_inum) {
617ba13b 4236 if (!(journal = ext4_get_journal(sb, journal_inum)))
ac27a0ec
DK		 4237 return -EINVAL;
4238 } else {
617ba13b 4239 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
ac27a0ec
DK		 4240 return -EINVAL;
4241 }
4242
90576c0b 4243 if (!(journal->j_flags & JBD2_BARRIER))
b31e1552 4244 ext4_msg(sb, KERN_INFO, "barriers disabled");
4776004f 4245
e2b911c5 4246 if (!ext4_has_feature_journal_needs_recovery(sb))
dab291af 4247 err = jbd2_journal_wipe(journal, !really_read_only);
1c13d5c0
TT		 4248 if (!err) {
4249 char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL);
4250 if (save)
4251 memcpy(save, ((char *) es) +
4252 EXT4_S_ERR_START, EXT4_S_ERR_LEN);
dab291af 4253 err = jbd2_journal_load(journal);
1c13d5c0
TT		 4254 if (save)
4255 memcpy(((char *) es) + EXT4_S_ERR_START,
4256 save, EXT4_S_ERR_LEN);
4257 kfree(save);
4258 }
ac27a0ec
DK		 4259
4260 if (err) {
b31e1552 4261 ext4_msg(sb, KERN_ERR, "error loading journal");
dab291af 4262 jbd2_journal_destroy(journal);
ac27a0ec
DK		 4263 return err;
4264 }
4265
617ba13b
MC		 4266 EXT4_SB(sb)->s_journal = journal;
4267 ext4_clear_journal_err(sb, es);
ac27a0ec 4268
c41303ce 4269 if (!really_read_only && journal_devnum &&
ac27a0ec
DK		 4270 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
4271 es->s_journal_dev = cpu_to_le32(journal_devnum);
ac27a0ec
DK		 4272
4273 /* Make sure we flush the recovery flag to disk. */
e2d67052 4274 ext4_commit_super(sb, 1);
ac27a0ec
DK		 4275 }
4276
4277 return 0;
4278}
4279
e2d67052 4280static int ext4_commit_super(struct super_block *sb, int sync)
ac27a0ec 4281{
e2d67052 4282 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
617ba13b 4283 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
c4be0c1d 4284 int error = 0;
ac27a0ec 4285
bdfe0cbd 4286 if (!sbh || block_device_ejected(sb))
c4be0c1d 4287 return error;
914258bf
TT		 4288 if (buffer_write_io_error(sbh)) {
4289 /*
4290 * Oh, dear. A previous attempt to write the
4291 * superblock failed. This could happen because the
4292 * USB device was yanked out. Or it could happen to
4293 * be a transient write error and maybe the block will
4294 * be remapped. Nothing we can do but to retry the
4295 * write and hope for the best.
4296 */
b31e1552
ES		 4297 ext4_msg(sb, KERN_ERR, "previous I/O error to "
4298 "superblock detected");
914258bf
TT		 4299 clear_buffer_write_io_error(sbh);
4300 set_buffer_uptodate(sbh);
4301 }
71290b36
TT		 4302 /*
4303 * If the file system is mounted read-only, don't update the
4304 * superblock write time. This avoids updating the superblock
4305 * write time when we are mounting the root file system
4306 * read/only but we need to replay the journal; at that point,
4307 * for people who are east of GMT and who make their clock
4308 * tick in localtime for Windows bug-for-bug compatibility,
4309 * the clock is set in the future, and this will cause e2fsck
4310 * to complain and force a full file system check.
4311 */
4312 if (!(sb->s_flags & MS_RDONLY))
4313 es->s_wtime = cpu_to_le32(get_seconds());
f613dfcb
TT		 4314 if (sb->s_bdev->bd_part)
4315 es->s_kbytes_written =
4316 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written +
afc32f7e
TT		 4317 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
4318 EXT4_SB(sb)->s_sectors_written_start) >> 1));
f613dfcb
TT		 4319 else
4320 es->s_kbytes_written =
4321 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written);
d5e03cbb
TT		 4322 if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeclusters_counter))
4323 ext4_free_blocks_count_set(es,
57042651
TT		 4324 EXT4_C2B(EXT4_SB(sb), percpu_counter_sum_positive(
4325 &EXT4_SB(sb)->s_freeclusters_counter)));
d5e03cbb
TT		 4326 if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeinodes_counter))
4327 es->s_free_inodes_count =
4328 cpu_to_le32(percpu_counter_sum_positive(
ce7e010a 4329 &EXT4_SB(sb)->s_freeinodes_counter));
ac27a0ec 4330 BUFFER_TRACE(sbh, "marking dirty");
06db49e6 4331 ext4_superblock_csum_set(sb);
ac27a0ec 4332 mark_buffer_dirty(sbh);
914258bf 4333 if (sync) {
564bc402
DJ		 4334 error = __sync_dirty_buffer(sbh,
4335 test_opt(sb, BARRIER) ? WRITE_FUA : WRITE_SYNC);
c4be0c1d
TS		 4336 if (error)
4337 return error;
4338
4339 error = buffer_write_io_error(sbh);
4340 if (error) {
b31e1552
ES		 4341 ext4_msg(sb, KERN_ERR, "I/O error while writing "
4342 "superblock");
914258bf
TT		 4343 clear_buffer_write_io_error(sbh);
4344 set_buffer_uptodate(sbh);
4345 }
4346 }
c4be0c1d 4347 return error;
ac27a0ec
DK		 4348}
4349
ac27a0ec
DK		 4350/*
4351 * Have we just finished recovery? If so, and if we are mounting (or
4352 * remounting) the filesystem readonly, then we will end up with a
4353 * consistent fs on disk. Record that fact.
4354 */
2b2d6d01
TT		 4355static void ext4_mark_recovery_complete(struct super_block *sb,
4356 struct ext4_super_block *es)
ac27a0ec 4357{
617ba13b 4358 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 4359
e2b911c5 4360 if (!ext4_has_feature_journal(sb)) {
0390131b
FM		 4361 BUG_ON(journal != NULL);
4362 return;
4363 }
dab291af 4364 jbd2_journal_lock_updates(journal);
7ffe1ea8
HK		 4365 if (jbd2_journal_flush(journal) < 0)
4366 goto out;
4367
e2b911c5 4368 if (ext4_has_feature_journal_needs_recovery(sb) &&
ac27a0ec 4369 sb->s_flags & MS_RDONLY) {
e2b911c5 4370 ext4_clear_feature_journal_needs_recovery(sb);
e2d67052 4371 ext4_commit_super(sb, 1);
ac27a0ec 4372 }
7ffe1ea8
HK		 4373
4374out:
dab291af 4375 jbd2_journal_unlock_updates(journal);
ac27a0ec
DK		 4376}
4377
4378/*
4379 * If we are mounting (or read-write remounting) a filesystem whose journal
4380 * has recorded an error from a previous lifetime, move that error to the
4381 * main filesystem now.
4382 */
2b2d6d01
TT		 4383static void ext4_clear_journal_err(struct super_block *sb,
4384 struct ext4_super_block *es)
ac27a0ec
DK		 4385{
4386 journal_t *journal;
4387 int j_errno;
4388 const char *errstr;
4389
e2b911c5 4390 BUG_ON(!ext4_has_feature_journal(sb));
0390131b 4391
617ba13b 4392 journal = EXT4_SB(sb)->s_journal;
ac27a0ec
DK		 4393
4394 /*
4395 * Now check for any error status which may have been recorded in the
617ba13b 4396 * journal by a prior ext4_error() or ext4_abort()
ac27a0ec
DK		 4397 */
4398
dab291af 4399 j_errno = jbd2_journal_errno(journal);
ac27a0ec
DK		 4400 if (j_errno) {
4401 char nbuf[16];
4402
617ba13b 4403 errstr = ext4_decode_error(sb, j_errno, nbuf);
12062ddd 4404 ext4_warning(sb, "Filesystem error recorded "
ac27a0ec 4405 "from previous mount: %s", errstr);
12062ddd 4406 ext4_warning(sb, "Marking fs in need of filesystem check.");
ac27a0ec 4407
617ba13b
MC		 4408 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
4409 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
e2d67052 4410 ext4_commit_super(sb, 1);
ac27a0ec 4411
dab291af 4412 jbd2_journal_clear_err(journal);
d796c52e 4413 jbd2_journal_update_sb_errno(journal);
ac27a0ec
DK		 4414 }
4415}
4416
4417/*
4418 * Force the running and committing transactions to commit,
4419 * and wait on the commit.
4420 */
617ba13b 4421int ext4_force_commit(struct super_block *sb)
ac27a0ec
DK		 4422{
4423 journal_t *journal;
ac27a0ec
DK		 4424
4425 if (sb->s_flags & MS_RDONLY)
4426 return 0;
4427
617ba13b 4428 journal = EXT4_SB(sb)->s_journal;
b1deefc9 4429 return ext4_journal_force_commit(journal);
ac27a0ec
DK		 4430}
4431
617ba13b 4432static int ext4_sync_fs(struct super_block *sb, int wait)
ac27a0ec 4433{
14ce0cb4 4434 int ret = 0;
9eddacf9 4435 tid_t target;
06a407f1 4436 bool needs_barrier = false;
8d5d02e6 4437 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4438
9bffad1e 4439 trace_ext4_sync_fs(sb, wait);
2e8fa54e 4440 flush_workqueue(sbi->rsv_conversion_wq);
a1177825
JK		 4441 /*
4442 * Writeback quota in non-journalled quota case - journalled quota has
4443 * no dirty dquots
4444 */
4445 dquot_writeback_dquots(sb, -1);
06a407f1
DM		 4446 /*
4447 * Data writeback is possible w/o journal transaction, so barrier must
4448 * being sent at the end of the function. But we can skip it if
4449 * transaction_commit will do it for us.
4450 */
bda32530
TT		 4451 if (sbi->s_journal) {
4452 target = jbd2_get_latest_transaction(sbi->s_journal);
4453 if (wait && sbi->s_journal->j_flags & JBD2_BARRIER &&
4454 !jbd2_trans_will_send_data_barrier(sbi->s_journal, target))
4455 needs_barrier = true;
4456
4457 if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
4458 if (wait)
4459 ret = jbd2_log_wait_commit(sbi->s_journal,
4460 target);
4461 }
4462 } else if (wait && test_opt(sb, BARRIER))
06a407f1 4463 needs_barrier = true;
06a407f1
DM		 4464 if (needs_barrier) {
4465 int err;
4466 err = blkdev_issue_flush(sb->s_bdev, GFP_KERNEL, NULL);
4467 if (!ret)
4468 ret = err;
0390131b 4469 }
06a407f1
DM		 4470
4471 return ret;
4472}
4473
ac27a0ec
DK		 4474/*
4475 * LVM calls this function before a (read-only) snapshot is created. This
4476 * gives us a chance to flush the journal completely and mark the fs clean.
be4f27d3
YY		 4477 *
4478 * Note that only this function cannot bring a filesystem to be in a clean
8e8ad8a5
JK		 4479 * state independently. It relies on upper layer to stop all data & metadata
4480 * modifications.
ac27a0ec 4481 */
c4be0c1d 4482static int ext4_freeze(struct super_block *sb)
ac27a0ec 4483{
c4be0c1d
TS		 4484 int error = 0;
4485 journal_t *journal;
ac27a0ec 4486
9ca92389
TT		 4487 if (sb->s_flags & MS_RDONLY)
4488 return 0;
ac27a0ec 4489
9ca92389 4490 journal = EXT4_SB(sb)->s_journal;
7ffe1ea8 4491
bb044576
TT		 4492 if (journal) {
4493 /* Now we set up the journal barrier. */
4494 jbd2_journal_lock_updates(journal);
ac27a0ec 4495
bb044576
TT		 4496 /*
4497 * Don't clear the needs_recovery flag if we failed to
4498 * flush the journal.
4499 */
4500 error = jbd2_journal_flush(journal);
4501 if (error < 0)
4502 goto out;
c642dc9e
ES		 4503
4504 /* Journal blocked and flushed, clear needs_recovery flag. */
e2b911c5 4505 ext4_clear_feature_journal_needs_recovery(sb);
bb044576 4506 }
9ca92389 4507
9ca92389 4508 error = ext4_commit_super(sb, 1);
6b0310fb 4509out:
bb044576
TT		 4510 if (journal)
4511 /* we rely on upper layer to stop further updates */
4512 jbd2_journal_unlock_updates(journal);
6b0310fb 4513 return error;
ac27a0ec
DK		 4514}
4515
4516/*
4517 * Called by LVM after the snapshot is done. We need to reset the RECOVER
4518 * flag here, even though the filesystem is not technically dirty yet.
4519 */
c4be0c1d 4520static int ext4_unfreeze(struct super_block *sb)
ac27a0ec 4521{
9ca92389
TT		 4522 if (sb->s_flags & MS_RDONLY)
4523 return 0;
4524
c642dc9e
ES		 4525 if (EXT4_SB(sb)->s_journal) {
4526 /* Reset the needs_recovery flag before the fs is unlocked. */
e2b911c5 4527 ext4_set_feature_journal_needs_recovery(sb);
c642dc9e
ES		 4528 }
4529
9ca92389 4530 ext4_commit_super(sb, 1);
c4be0c1d 4531 return 0;
ac27a0ec
DK		 4532}
4533
673c6100
TT		 4534/*
4535 * Structure to save mount options for ext4_remount's benefit
4536 */
4537struct ext4_mount_options {
4538 unsigned long s_mount_opt;
a2595b8a 4539 unsigned long s_mount_opt2;
08cefc7a
EB		 4540 kuid_t s_resuid;
4541 kgid_t s_resgid;
673c6100
TT		 4542 unsigned long s_commit_interval;
4543 u32 s_min_batch_time, s_max_batch_time;
4544#ifdef CONFIG_QUOTA
4545 int s_jquota_fmt;
a2d4a646 4546 char *s_qf_names[EXT4_MAXQUOTAS];
673c6100
TT		 4547#endif
4548};
4549
2b2d6d01 4550static int ext4_remount(struct super_block *sb, int *flags, char *data)
ac27a0ec 4551{
2b2d6d01 4552 struct ext4_super_block *es;
617ba13b 4553 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4554 unsigned long old_sb_flags;
617ba13b 4555 struct ext4_mount_options old_opts;
c79d967d 4556 int enable_quota = 0;
8a266467 4557 ext4_group_t g;
b3881f74 4558 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
c5e06d10 4559 int err = 0;
ac27a0ec 4560#ifdef CONFIG_QUOTA
03dafb5f 4561 int i, j;
ac27a0ec 4562#endif
d4c402d9 4563 char *orig_data = kstrdup(data, GFP_KERNEL);
ac27a0ec
DK		 4564
4565 /* Store the original options */
4566 old_sb_flags = sb->s_flags;
4567 old_opts.s_mount_opt = sbi->s_mount_opt;
a2595b8a 4568 old_opts.s_mount_opt2 = sbi->s_mount_opt2;
ac27a0ec
DK		 4569 old_opts.s_resuid = sbi->s_resuid;
4570 old_opts.s_resgid = sbi->s_resgid;
4571 old_opts.s_commit_interval = sbi->s_commit_interval;
30773840
TT		 4572 old_opts.s_min_batch_time = sbi->s_min_batch_time;
4573 old_opts.s_max_batch_time = sbi->s_max_batch_time;
ac27a0ec
DK		 4574#ifdef CONFIG_QUOTA
4575 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
a2d4a646 4576 for (i = 0; i < EXT4_MAXQUOTAS; i++)
03dafb5f
CG		 4577 if (sbi->s_qf_names[i]) {
4578 old_opts.s_qf_names[i] = kstrdup(sbi->s_qf_names[i],
4579 GFP_KERNEL);
4580 if (!old_opts.s_qf_names[i]) {
4581 for (j = 0; j < i; j++)
4582 kfree(old_opts.s_qf_names[j]);
3e36a163 4583 kfree(orig_data);
03dafb5f
CG		 4584 return -ENOMEM;
4585 }
4586 } else
4587 old_opts.s_qf_names[i] = NULL;
ac27a0ec 4588#endif
b3881f74
TT		 4589 if (sbi->s_journal && sbi->s_journal->j_task->io_context)
4590 journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
ac27a0ec 4591
661aa520 4592 if (!parse_options(data, sb, NULL, &journal_ioprio, 1)) {
ac27a0ec
DK		 4593 err = -EINVAL;
4594 goto restore_opts;
4595 }
4596
6b992ff2 4597 if ((old_opts.s_mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) ^
c6d3d56d
DW		 4598 test_opt(sb, JOURNAL_CHECKSUM)) {
4599 ext4_msg(sb, KERN_ERR, "changing journal_checksum "
2d5b86e0
ES		 4600 "during remount not supported; ignoring");
4601 sbi->s_mount_opt ^= EXT4_MOUNT_JOURNAL_CHECKSUM;
6b992ff2
DW		 4602 }
4603
6ae6514b
PS		 4604 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
4605 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
4606 ext4_msg(sb, KERN_ERR, "can't mount with "
4607 "both data=journal and delalloc");
4608 err = -EINVAL;
4609 goto restore_opts;
4610 }
4611 if (test_opt(sb, DIOREAD_NOLOCK)) {
4612 ext4_msg(sb, KERN_ERR, "can't mount with "
4613 "both data=journal and dioread_nolock");
4614 err = -EINVAL;
4615 goto restore_opts;
4616 }
923ae0ff
RZ		 4617 if (test_opt(sb, DAX)) {
4618 ext4_msg(sb, KERN_ERR, "can't mount with "
4619 "both data=journal and dax");
4620 err = -EINVAL;
4621 goto restore_opts;
4622 }
4623 }
4624
4625 if ((sbi->s_mount_opt ^ old_opts.s_mount_opt) & EXT4_MOUNT_DAX) {
4626 ext4_msg(sb, KERN_WARNING, "warning: refusing change of "
4627 "dax flag with busy inodes while remounting");
4628 sbi->s_mount_opt ^= EXT4_MOUNT_DAX;
6ae6514b
PS		 4629 }
4630
4ab2f15b 4631 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
c67d859e 4632 ext4_abort(sb, "Abort forced by user");
ac27a0ec
DK		 4633
4634 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
482a7425 4635 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec
DK		 4636
4637 es = sbi->s_es;
4638
b3881f74 4639 if (sbi->s_journal) {
0390131b 4640 ext4_init_journal_params(sb, sbi->s_journal);
b3881f74
TT		 4641 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
4642 }
ac27a0ec 4643
a2fd66d0
TT		 4644 if (*flags & MS_LAZYTIME)
4645 sb->s_flags |= MS_LAZYTIME;
4646
661aa520 4647 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
4ab2f15b 4648 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) {
ac27a0ec
DK		 4649 err = -EROFS;
4650 goto restore_opts;
4651 }
4652
4653 if (*flags & MS_RDONLY) {
38c03b34
TT		 4654 err = sync_filesystem(sb);
4655 if (err < 0)
4656 goto restore_opts;
0f0dd62f
CH		 4657 err = dquot_suspend(sb, -1);
4658 if (err < 0)
c79d967d 4659 goto restore_opts;
c79d967d 4660
ac27a0ec
DK		 4661 /*
4662 * First of all, the unconditional stuff we have to do
4663 * to disable replay of the journal when we next remount
4664 */
4665 sb->s_flags |= MS_RDONLY;
4666
4667 /*
4668 * OK, test if we are remounting a valid rw partition
4669 * readonly, and if so set the rdonly flag and then
4670 * mark the partition as valid again.
4671 */
617ba13b
MC		 4672 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
4673 (sbi->s_mount_state & EXT4_VALID_FS))
ac27a0ec
DK		 4674 es->s_state = cpu_to_le16(sbi->s_mount_state);
4675
a63c9eb2 4676 if (sbi->s_journal)
0390131b 4677 ext4_mark_recovery_complete(sb, es);
ac27a0ec 4678 } else {
a13fb1a4 4679 /* Make sure we can mount this feature set readwrite */
e2b911c5 4680 if (ext4_has_feature_readonly(sb) ||
2cb5cc8b 4681 !ext4_feature_set_ok(sb, 0)) {
ac27a0ec
DK		 4682 err = -EROFS;
4683 goto restore_opts;
4684 }
8a266467
TT		 4685 /*
4686 * Make sure the group descriptor checksums
0b8e58a1 4687 * are sane. If they aren't, refuse to remount r/w.
8a266467
TT		 4688 */
4689 for (g = 0; g < sbi->s_groups_count; g++) {
4690 struct ext4_group_desc *gdp =
4691 ext4_get_group_desc(sb, g, NULL);
4692
feb0ab32 4693 if (!ext4_group_desc_csum_verify(sb, g, gdp)) {
b31e1552
ES		 4694 ext4_msg(sb, KERN_ERR,
4695 "ext4_remount: Checksum for group %u failed (%u!=%u)",
e2b911c5 4696 g, le16_to_cpu(ext4_group_desc_csum(sb, g, gdp)),
8a266467 4697 le16_to_cpu(gdp->bg_checksum));
6a797d27 4698 err = -EFSBADCRC;
8a266467
TT		 4699 goto restore_opts;
4700 }
4701 }
4702
ead6596b
ES		 4703 /*
4704 * If we have an unprocessed orphan list hanging
4705 * around from a previously readonly bdev mount,
4706 * require a full umount/remount for now.
4707 */
4708 if (es->s_last_orphan) {
b31e1552 4709 ext4_msg(sb, KERN_WARNING, "Couldn't "
ead6596b
ES		 4710 "remount RDWR because of unprocessed "
4711 "orphan inode list. Please "
b31e1552 4712 "umount/remount instead");
ead6596b
ES		 4713 err = -EINVAL;
4714 goto restore_opts;
4715 }
4716
ac27a0ec
DK		 4717 /*
4718 * Mounting a RDONLY partition read-write, so reread
4719 * and store the current valid flag. (It may have
4720 * been changed by e2fsck since we originally mounted
4721 * the partition.)
4722 */
0390131b
FM		 4723 if (sbi->s_journal)
4724 ext4_clear_journal_err(sb, es);
ac27a0ec 4725 sbi->s_mount_state = le16_to_cpu(es->s_state);
2b2d6d01 4726 if (!ext4_setup_super(sb, es, 0))
ac27a0ec 4727 sb->s_flags &= ~MS_RDONLY;
e2b911c5 4728 if (ext4_has_feature_mmp(sb))
c5e06d10
JL		 4729 if (ext4_multi_mount_protect(sb,
4730 le64_to_cpu(es->s_mmp_block))) {
4731 err = -EROFS;
4732 goto restore_opts;
4733 }
c79d967d 4734 enable_quota = 1;
ac27a0ec
DK		 4735 }
4736 }
bfff6873
LC		 4737
4738 /*
4739 * Reinitialize lazy itable initialization thread based on
4740 * current settings
4741 */
4742 if ((sb->s_flags & MS_RDONLY) || !test_opt(sb, INIT_INODE_TABLE))
4743 ext4_unregister_li_request(sb);
4744 else {
4745 ext4_group_t first_not_zeroed;
4746 first_not_zeroed = ext4_has_uninit_itable(sb);
4747 ext4_register_li_request(sb, first_not_zeroed);
4748 }
4749
6fd058f7 4750 ext4_setup_system_zone(sb);
d096ad0f 4751 if (sbi->s_journal == NULL && !(old_sb_flags & MS_RDONLY))
e2d67052 4752 ext4_commit_super(sb, 1);
0390131b 4753
ac27a0ec
DK		 4754#ifdef CONFIG_QUOTA
4755 /* Release old quota file names */
a2d4a646 4756 for (i = 0; i < EXT4_MAXQUOTAS; i++)
03dafb5f 4757 kfree(old_opts.s_qf_names[i]);
7c319d32
AK		 4758 if (enable_quota) {
4759 if (sb_any_quota_suspended(sb))
4760 dquot_resume(sb, -1);
e2b911c5 4761 else if (ext4_has_feature_quota(sb)) {
7c319d32 4762 err = ext4_enable_quotas(sb);
07724f98 4763 if (err)
7c319d32 4764 goto restore_opts;
7c319d32
AK		 4765 }
4766 }
ac27a0ec 4767#endif
d4c402d9 4768
a26f4992 4769 *flags = (*flags & ~MS_LAZYTIME) | (sb->s_flags & MS_LAZYTIME);
d4c402d9
CW		 4770 ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s", orig_data);
4771 kfree(orig_data);
ac27a0ec 4772 return 0;
0b8e58a1 4773
ac27a0ec
DK		 4774restore_opts:
4775 sb->s_flags = old_sb_flags;
4776 sbi->s_mount_opt = old_opts.s_mount_opt;
a2595b8a 4777 sbi->s_mount_opt2 = old_opts.s_mount_opt2;
ac27a0ec
DK		 4778 sbi->s_resuid = old_opts.s_resuid;
4779 sbi->s_resgid = old_opts.s_resgid;
4780 sbi->s_commit_interval = old_opts.s_commit_interval;
30773840
TT		 4781 sbi->s_min_batch_time = old_opts.s_min_batch_time;
4782 sbi->s_max_batch_time = old_opts.s_max_batch_time;
ac27a0ec
DK		 4783#ifdef CONFIG_QUOTA
4784 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
a2d4a646 4785 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
03dafb5f 4786 kfree(sbi->s_qf_names[i]);
ac27a0ec
DK		 4787 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
4788 }
4789#endif
d4c402d9 4790 kfree(orig_data);
ac27a0ec
DK		 4791 return err;
4792}
4793
2b2d6d01 4794static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
ac27a0ec
DK		 4795{
4796 struct super_block *sb = dentry->d_sb;
617ba13b
MC		 4797 struct ext4_sb_info *sbi = EXT4_SB(sb);
4798 struct ext4_super_block *es = sbi->s_es;
27dd4385 4799 ext4_fsblk_t overhead = 0, resv_blocks;
960cc398 4800 u64 fsid;
d02a9391 4801 s64 bfree;
27dd4385 4802 resv_blocks = EXT4_C2B(sbi, atomic64_read(&sbi->s_resv_clusters));
ac27a0ec 4803
952fc18e
TT		 4804 if (!test_opt(sb, MINIX_DF))
4805 overhead = sbi->s_overhead;
ac27a0ec 4806
617ba13b 4807 buf->f_type = EXT4_SUPER_MAGIC;
ac27a0ec 4808 buf->f_bsize = sb->s_blocksize;
b72f78cb 4809 buf->f_blocks = ext4_blocks_count(es) - EXT4_C2B(sbi, overhead);
57042651
TT		 4810 bfree = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) -
4811 percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter);
d02a9391 4812 /* prevent underflow in case that few free space is available */
57042651 4813 buf->f_bfree = EXT4_C2B(sbi, max_t(s64, bfree, 0));
27dd4385
LC		 4814 buf->f_bavail = buf->f_bfree -
4815 (ext4_r_blocks_count(es) + resv_blocks);
4816 if (buf->f_bfree < (ext4_r_blocks_count(es) + resv_blocks))
ac27a0ec
DK		 4817 buf->f_bavail = 0;
4818 buf->f_files = le32_to_cpu(es->s_inodes_count);
52d9f3b4 4819 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
617ba13b 4820 buf->f_namelen = EXT4_NAME_LEN;
960cc398
PE		 4821 fsid = le64_to_cpup((void *)es->s_uuid) ^
4822 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
4823 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
4824 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
0b8e58a1 4825
ac27a0ec
DK		 4826 return 0;
4827}
4828
0b8e58a1
AD		 4829/* Helper function for writing quotas on sync - we need to start transaction
4830 * before quota file is locked for write. Otherwise the are possible deadlocks:
ac27a0ec 4831 * Process 1 Process 2
617ba13b 4832 * ext4_create() quota_sync()
a269eb18 4833 * jbd2_journal_start() write_dquot()
871a2931 4834 * dquot_initialize() down(dqio_mutex)
dab291af 4835 * down(dqio_mutex) jbd2_journal_start()
ac27a0ec
DK		 4836 *
4837 */
4838
4839#ifdef CONFIG_QUOTA
4840
4841static inline struct inode *dquot_to_inode(struct dquot *dquot)
4842{
4c376dca 4843 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_id.type];
ac27a0ec
DK		 4844}
4845
617ba13b 4846static int ext4_write_dquot(struct dquot *dquot)
ac27a0ec
DK		 4847{
4848 int ret, err;
4849 handle_t *handle;
4850 struct inode *inode;
4851
4852 inode = dquot_to_inode(dquot);
9924a92a 4853 handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
0b8e58a1 4854 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 4855 if (IS_ERR(handle))
4856 return PTR_ERR(handle);
4857 ret = dquot_commit(dquot);
617ba13b 4858 err = ext4_journal_stop(handle);
ac27a0ec
DK		 4859 if (!ret)
4860 ret = err;
4861 return ret;
4862}
4863
617ba13b 4864static int ext4_acquire_dquot(struct dquot *dquot)
ac27a0ec
DK		 4865{
4866 int ret, err;
4867 handle_t *handle;
4868
9924a92a 4869 handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
0b8e58a1 4870 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 4871 if (IS_ERR(handle))
4872 return PTR_ERR(handle);
4873 ret = dquot_acquire(dquot);
617ba13b 4874 err = ext4_journal_stop(handle);
ac27a0ec
DK		 4875 if (!ret)
4876 ret = err;
4877 return ret;
4878}
4879
617ba13b 4880static int ext4_release_dquot(struct dquot *dquot)
ac27a0ec
DK		 4881{
4882 int ret, err;
4883 handle_t *handle;
4884
9924a92a 4885 handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
0b8e58a1 4886 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
9c3013e9
JK		 4887 if (IS_ERR(handle)) {
4888 /* Release dquot anyway to avoid endless cycle in dqput() */
4889 dquot_release(dquot);
ac27a0ec 4890 return PTR_ERR(handle);
9c3013e9 4891 }
ac27a0ec 4892 ret = dquot_release(dquot);
617ba13b 4893 err = ext4_journal_stop(handle);
ac27a0ec
DK		 4894 if (!ret)
4895 ret = err;
4896 return ret;
4897}
4898
617ba13b 4899static int ext4_mark_dquot_dirty(struct dquot *dquot)
ac27a0ec 4900{
262b4662
JK		 4901 struct super_block *sb = dquot->dq_sb;
4902 struct ext4_sb_info *sbi = EXT4_SB(sb);
4903
2c8be6b2 4904 /* Are we journaling quotas? */
e2b911c5 4905 if (ext4_has_feature_quota(sb) ||
262b4662 4906 sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
ac27a0ec 4907 dquot_mark_dquot_dirty(dquot);
617ba13b 4908 return ext4_write_dquot(dquot);
ac27a0ec
DK		 4909 } else {
4910 return dquot_mark_dquot_dirty(dquot);
4911 }
4912}
4913
617ba13b 4914static int ext4_write_info(struct super_block *sb, int type)
ac27a0ec
DK		 4915{
4916 int ret, err;
4917 handle_t *handle;
4918
4919 /* Data block + inode block */
2b0143b5 4920 handle = ext4_journal_start(d_inode(sb->s_root), EXT4_HT_QUOTA, 2);
ac27a0ec
DK		 4921 if (IS_ERR(handle))
4922 return PTR_ERR(handle);
4923 ret = dquot_commit_info(sb, type);
617ba13b 4924 err = ext4_journal_stop(handle);
ac27a0ec
DK		 4925 if (!ret)
4926 ret = err;
4927 return ret;
4928}
4929
4930/*
4931 * Turn on quotas during mount time - we need to find
4932 * the quota file and such...
4933 */
617ba13b 4934static int ext4_quota_on_mount(struct super_block *sb, int type)
ac27a0ec 4935{
287a8095
CH		 4936 return dquot_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
4937 EXT4_SB(sb)->s_jquota_fmt, type);
ac27a0ec
DK		 4938}
4939
4940/*
4941 * Standard function to be called on quota_on
4942 */
617ba13b 4943static int ext4_quota_on(struct super_block *sb, int type, int format_id,
f00c9e44 4944 struct path *path)
ac27a0ec
DK		 4945{
4946 int err;
ac27a0ec
DK		 4947
4948 if (!test_opt(sb, QUOTA))
4949 return -EINVAL;
0623543b 4950
ac27a0ec 4951 /* Quotafile not on the same filesystem? */
d8c9584e 4952 if (path->dentry->d_sb != sb)
ac27a0ec 4953 return -EXDEV;
0623543b
JK		 4954 /* Journaling quota? */
4955 if (EXT4_SB(sb)->s_qf_names[type]) {
2b2d6d01 4956 /* Quotafile not in fs root? */
f00c9e44 4957 if (path->dentry->d_parent != sb->s_root)
b31e1552
ES		 4958 ext4_msg(sb, KERN_WARNING,
4959 "Quota file not on filesystem root. "
4960 "Journaled quota will not work");
2b2d6d01 4961 }
0623543b
JK		 4962
4963 /*
4964 * When we journal data on quota file, we have to flush journal to see
4965 * all updates to the file when we bypass pagecache...
4966 */
0390131b 4967 if (EXT4_SB(sb)->s_journal &&
2b0143b5 4968 ext4_should_journal_data(d_inode(path->dentry))) {
0623543b
JK		 4969 /*
4970 * We don't need to lock updates but journal_flush() could
4971 * otherwise be livelocked...
4972 */
4973 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
7ffe1ea8 4974 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
0623543b 4975 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
f00c9e44 4976 if (err)
7ffe1ea8 4977 return err;
0623543b
JK		 4978 }
4979
f00c9e44 4980 return dquot_quota_on(sb, type, format_id, path);
ac27a0ec
DK		 4981}
4982
7c319d32
AK		 4983static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
4984 unsigned int flags)
4985{
4986 int err;
4987 struct inode *qf_inode;
a2d4a646 4988 unsigned long qf_inums[EXT4_MAXQUOTAS] = {
7c319d32
AK		 4989 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
4990 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum)
4991 };
4992
e2b911c5 4993 BUG_ON(!ext4_has_feature_quota(sb));
7c319d32
AK		 4994
4995 if (!qf_inums[type])
4996 return -EPERM;
4997
4998 qf_inode = ext4_iget(sb, qf_inums[type]);
4999 if (IS_ERR(qf_inode)) {
5000 ext4_error(sb, "Bad quota inode # %lu", qf_inums[type]);
5001 return PTR_ERR(qf_inode);
5002 }
5003
bcb13850
JK		 5004 /* Don't account quota for quota files to avoid recursion */
5005 qf_inode->i_flags |= S_NOQUOTA;
7c319d32
AK		 5006 err = dquot_enable(qf_inode, type, format_id, flags);
5007 iput(qf_inode);
5008
5009 return err;
5010}
5011
5012/* Enable usage tracking for all quota types. */
5013static int ext4_enable_quotas(struct super_block *sb)
5014{
5015 int type, err = 0;
a2d4a646 5016 unsigned long qf_inums[EXT4_MAXQUOTAS] = {
7c319d32
AK		 5017 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
5018 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum)
5019 };
5020
5021 sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE;
a2d4a646 5022 for (type = 0; type < EXT4_MAXQUOTAS; type++) {
7c319d32
AK		 5023 if (qf_inums[type]) {
5024 err = ext4_quota_enable(sb, type, QFMT_VFS_V1,
5025 DQUOT_USAGE_ENABLED);
5026 if (err) {
5027 ext4_warning(sb,
72ba7450
TT		 5028 "Failed to enable quota tracking "
5029 "(type=%d, err=%d). Please run "
5030 "e2fsck to fix.", type, err);
7c319d32
AK		 5031 return err;
5032 }
5033 }
5034 }
5035 return 0;
5036}
5037
ca0e05e4
DM		 5038static int ext4_quota_off(struct super_block *sb, int type)
5039{
21f97697
JK		 5040 struct inode *inode = sb_dqopt(sb)->files[type];
5041 handle_t *handle;
5042
87009d86
DM		 5043 /* Force all delayed allocation blocks to be allocated.
5044 * Caller already holds s_umount sem */
5045 if (test_opt(sb, DELALLOC))
ca0e05e4 5046 sync_filesystem(sb);
ca0e05e4 5047
0b268590
AG		 5048 if (!inode)
5049 goto out;
5050
21f97697
JK		 5051 /* Update modification times of quota files when userspace can
5052 * start looking at them */
9924a92a 5053 handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1);
21f97697
JK		 5054 if (IS_ERR(handle))
5055 goto out;
5056 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
5057 ext4_mark_inode_dirty(handle, inode);
5058 ext4_journal_stop(handle);
5059
5060out:
ca0e05e4
DM		 5061 return dquot_quota_off(sb, type);
5062}
5063
ac27a0ec
DK		 5064/* Read data from quotafile - avoid pagecache and such because we cannot afford
5065 * acquiring the locks... As quota files are never truncated and quota code
25985edc 5066 * itself serializes the operations (and no one else should touch the files)
ac27a0ec 5067 * we don't have to be afraid of races */
617ba13b 5068static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec
DK		 5069 size_t len, loff_t off)
5070{
5071 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 5072 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 5073 int offset = off & (sb->s_blocksize - 1);
5074 int tocopy;
5075 size_t toread;
5076 struct buffer_head *bh;
5077 loff_t i_size = i_size_read(inode);
5078
5079 if (off > i_size)
5080 return 0;
5081 if (off+len > i_size)
5082 len = i_size-off;
5083 toread = len;
5084 while (toread > 0) {
5085 tocopy = sb->s_blocksize - offset < toread ?
5086 sb->s_blocksize - offset : toread;
1c215028
TT		 5087 bh = ext4_bread(NULL, inode, blk, 0);
5088 if (IS_ERR(bh))
5089 return PTR_ERR(bh);
ac27a0ec
DK		 5090 if (!bh) /* A hole? */
5091 memset(data, 0, tocopy);
5092 else
5093 memcpy(data, bh->b_data+offset, tocopy);
5094 brelse(bh);
5095 offset = 0;
5096 toread -= tocopy;
5097 data += tocopy;
5098 blk++;
5099 }
5100 return len;
5101}
5102
5103/* Write to quotafile (we know the transaction is already started and has
5104 * enough credits) */
617ba13b 5105static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec
DK		 5106 const char *data, size_t len, loff_t off)
5107{
5108 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 5109 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
1c215028 5110 int err, offset = off & (sb->s_blocksize - 1);
c5e298ae 5111 int retries = 0;
ac27a0ec
DK		 5112 struct buffer_head *bh;
5113 handle_t *handle = journal_current_handle();
5114
0390131b 5115 if (EXT4_SB(sb)->s_journal && !handle) {
b31e1552
ES		 5116 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
5117 " cancelled because transaction is not started",
9c3013e9
JK		 5118 (unsigned long long)off, (unsigned long long)len);
5119 return -EIO;
5120 }
67eeb568
DM		 5121 /*
5122 * Since we account only one data block in transaction credits,
5123 * then it is impossible to cross a block boundary.
5124 */
5125 if (sb->s_blocksize - offset < len) {
5126 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
5127 " cancelled because not block aligned",
5128 (unsigned long long)off, (unsigned long long)len);
5129 return -EIO;
5130 }
5131
c5e298ae
TT		 5132 do {
5133 bh = ext4_bread(handle, inode, blk,
5134 EXT4_GET_BLOCKS_CREATE |
5135 EXT4_GET_BLOCKS_METADATA_NOFAIL);
5136 } while (IS_ERR(bh) && (PTR_ERR(bh) == -ENOSPC) &&
5137 ext4_should_retry_alloc(inode->i_sb, &retries));
1c215028
TT		 5138 if (IS_ERR(bh))
5139 return PTR_ERR(bh);
67eeb568
DM		 5140 if (!bh)
5141 goto out;
5d601255 5142 BUFFER_TRACE(bh, "get write access");
62d2b5f2
JK		 5143 err = ext4_journal_get_write_access(handle, bh);
5144 if (err) {
5145 brelse(bh);
1c215028 5146 return err;
ac27a0ec 5147 }
67eeb568
DM		 5148 lock_buffer(bh);
5149 memcpy(bh->b_data+offset, data, len);
5150 flush_dcache_page(bh->b_page);
5151 unlock_buffer(bh);
62d2b5f2 5152 err = ext4_handle_dirty_metadata(handle, NULL, bh);
67eeb568 5153 brelse(bh);
ac27a0ec 5154out:
67eeb568
DM		 5155 if (inode->i_size < off + len) {
5156 i_size_write(inode, off + len);
617ba13b 5157 EXT4_I(inode)->i_disksize = inode->i_size;
21f97697 5158 ext4_mark_inode_dirty(handle, inode);
ac27a0ec 5159 }
67eeb568 5160 return len;
ac27a0ec
DK		 5161}
5162
5163#endif
5164
152a0836
AV		 5165static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
5166 const char *dev_name, void *data)
ac27a0ec 5167{
152a0836 5168 return mount_bdev(fs_type, flags, dev_name, data, ext4_fill_super);
ac27a0ec
DK		 5169}
5170
c290ea01 5171#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2)
24b58424
TT		 5172static inline void register_as_ext2(void)
5173{
5174 int err = register_filesystem(&ext2_fs_type);
5175 if (err)
5176 printk(KERN_WARNING
5177 "EXT4-fs: Unable to register as ext2 (%d)\n", err);
5178}
5179
5180static inline void unregister_as_ext2(void)
5181{
5182 unregister_filesystem(&ext2_fs_type);
5183}
2035e776
TT		 5184
5185static inline int ext2_feature_set_ok(struct super_block *sb)
5186{
e2b911c5 5187 if (ext4_has_unknown_ext2_incompat_features(sb))
2035e776
TT		 5188 return 0;
5189 if (sb->s_flags & MS_RDONLY)
5190 return 1;
e2b911c5 5191 if (ext4_has_unknown_ext2_ro_compat_features(sb))
2035e776
TT		 5192 return 0;
5193 return 1;
5194}
24b58424
TT		 5195#else
5196static inline void register_as_ext2(void) { }
5197static inline void unregister_as_ext2(void) { }
2035e776 5198static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; }
24b58424
TT		 5199#endif
5200
24b58424
TT		 5201static inline void register_as_ext3(void)
5202{
5203 int err = register_filesystem(&ext3_fs_type);
5204 if (err)
5205 printk(KERN_WARNING
5206 "EXT4-fs: Unable to register as ext3 (%d)\n", err);
5207}
5208
5209static inline void unregister_as_ext3(void)
5210{
5211 unregister_filesystem(&ext3_fs_type);
5212}
2035e776
TT		 5213
5214static inline int ext3_feature_set_ok(struct super_block *sb)
5215{
e2b911c5 5216 if (ext4_has_unknown_ext3_incompat_features(sb))
2035e776 5217 return 0;
e2b911c5 5218 if (!ext4_has_feature_journal(sb))
2035e776
TT		 5219 return 0;
5220 if (sb->s_flags & MS_RDONLY)
5221 return 1;
e2b911c5 5222 if (ext4_has_unknown_ext3_ro_compat_features(sb))
2035e776
TT		 5223 return 0;
5224 return 1;
5225}
24b58424 5226
03010a33
TT		 5227static struct file_system_type ext4_fs_type = {
5228 .owner = THIS_MODULE,
5229 .name = "ext4",
152a0836 5230 .mount = ext4_mount,
03010a33
TT		 5231 .kill_sb = kill_block_super,
5232 .fs_flags = FS_REQUIRES_DEV,
5233};
7f78e035 5234MODULE_ALIAS_FS("ext4");
03010a33 5235
e9e3bcec
ES		 5236/* Shared across all ext4 file systems */
5237wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
5238struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ];
5239
5dabfc78 5240static int __init ext4_init_fs(void)
ac27a0ec 5241{
e9e3bcec 5242 int i, err;
c9de560d 5243
e294a537 5244 ratelimit_state_init(&ext4_mount_msg_ratelimit, 30 * HZ, 64);
07c0c5d8
AV		 5245 ext4_li_info = NULL;
5246 mutex_init(&ext4_li_mtx);
5247
9a4c8019 5248 /* Build-time check for flags consistency */
12e9b892 5249 ext4_check_flag_values();
e9e3bcec
ES		 5250
5251 for (i = 0; i < EXT4_WQ_HASH_SZ; i++) {
5252 mutex_init(&ext4__aio_mutex[i]);
5253 init_waitqueue_head(&ext4__ioend_wq[i]);
5254 }
5255
51865fda 5256 err = ext4_init_es();
6fd058f7
TT		 5257 if (err)
5258 return err;
51865fda
ZL		 5259
5260 err = ext4_init_pageio();
5261 if (err)
b5799018 5262 goto out5;
51865fda 5263
5dabfc78 5264 err = ext4_init_system_zone();
bd2d0210 5265 if (err)
b5799018 5266 goto out4;
857ac889 5267
b5799018 5268 err = ext4_init_sysfs();
dd68314c 5269 if (err)
b5799018 5270 goto out3;
857ac889 5271
5dabfc78 5272 err = ext4_init_mballoc();
c9de560d
AT		 5273 if (err)
5274 goto out2;
9c191f70
M		 5275 else
5276 ext4_mballoc_ready = 1;
ac27a0ec
DK		 5277 err = init_inodecache();
5278 if (err)
5279 goto out1;
24b58424 5280 register_as_ext3();
2035e776 5281 register_as_ext2();
03010a33 5282 err = register_filesystem(&ext4_fs_type);
ac27a0ec
DK		 5283 if (err)
5284 goto out;
bfff6873 5285
ac27a0ec
DK		 5286 return 0;
5287out:
24b58424
TT		 5288 unregister_as_ext2();
5289 unregister_as_ext3();
ac27a0ec
DK		 5290 destroy_inodecache();
5291out1:
9c191f70 5292 ext4_mballoc_ready = 0;
5dabfc78 5293 ext4_exit_mballoc();
9c191f70 5294out2:
b5799018
TT		 5295 ext4_exit_sysfs();
5296out3:
5dabfc78 5297 ext4_exit_system_zone();
b5799018 5298out4:
5dabfc78 5299 ext4_exit_pageio();
b5799018 5300out5:
51865fda
ZL		 5301 ext4_exit_es();
5302
ac27a0ec
DK		 5303 return err;
5304}
5305
5dabfc78 5306static void __exit ext4_exit_fs(void)
ac27a0ec 5307{
e298e73b 5308 ext4_exit_crypto();
bfff6873 5309 ext4_destroy_lazyinit_thread();
24b58424
TT		 5310 unregister_as_ext2();
5311 unregister_as_ext3();
03010a33 5312 unregister_filesystem(&ext4_fs_type);
ac27a0ec 5313 destroy_inodecache();
5dabfc78 5314 ext4_exit_mballoc();
b5799018 5315 ext4_exit_sysfs();
5dabfc78
TT		 5316 ext4_exit_system_zone();
5317 ext4_exit_pageio();
dd12ed14 5318 ext4_exit_es();
ac27a0ec
DK		 5319}
5320
5321MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
83982b6f 5322MODULE_DESCRIPTION("Fourth Extended Filesystem");
ac27a0ec 5323MODULE_LICENSE("GPL");
5dabfc78
TT		 5324module_init(ext4_init_fs)
5325module_exit(ext4_exit_fs)
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