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overlayfs: Make f_path always point to the overlay and f_inode to the underlay
[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>
27#include <linux/parser.h>
ac27a0ec 28#include <linux/buffer_head.h>
a5694255 29#include <linux/exportfs.h>
ac27a0ec
DK		 30#include <linux/vfs.h>
31#include <linux/random.h>
32#include <linux/mount.h>
33#include <linux/namei.h>
34#include <linux/quotaops.h>
35#include <linux/seq_file.h>
9f6200bb 36#include <linux/proc_fs.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
1f109d5a 56static struct proc_dir_entry *ext4_proc_root;
3197ebdb 57static struct kset *ext4_kset;
0b75a840
LC		 58static struct ext4_lazy_init *ext4_li_info;
59static struct mutex ext4_li_mtx;
60static struct ext4_features *ext4_feat;
9c191f70 61static int ext4_mballoc_ready;
9f6200bb 62
617ba13b 63static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
ac27a0ec 64 unsigned long journal_devnum);
2adf6da8 65static int ext4_show_options(struct seq_file *seq, struct dentry *root);
e2d67052 66static int ext4_commit_super(struct super_block *sb, int sync);
2b2d6d01
TT		 67static void ext4_mark_recovery_complete(struct super_block *sb,
68 struct ext4_super_block *es);
69static void ext4_clear_journal_err(struct super_block *sb,
70 struct ext4_super_block *es);
617ba13b 71static int ext4_sync_fs(struct super_block *sb, int wait);
2b2d6d01
TT		 72static int ext4_remount(struct super_block *sb, int *flags, char *data);
73static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
c4be0c1d 74static int ext4_unfreeze(struct super_block *sb);
c4be0c1d 75static int ext4_freeze(struct super_block *sb);
152a0836
AV		 76static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
77 const char *dev_name, void *data);
2035e776
TT		 78static inline int ext2_feature_set_ok(struct super_block *sb);
79static inline int ext3_feature_set_ok(struct super_block *sb);
d39195c3 80static int ext4_feature_set_ok(struct super_block *sb, int readonly);
bfff6873
LC		 81static void ext4_destroy_lazyinit_thread(void);
82static void ext4_unregister_li_request(struct super_block *sb);
8f1f7453 83static void ext4_clear_request_list(void);
27dd4385 84static int ext4_reserve_clusters(struct ext4_sb_info *, ext4_fsblk_t);
ac27a0ec 85
2035e776
TT		 86#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
87static struct file_system_type ext2_fs_type = {
88 .owner = THIS_MODULE,
89 .name = "ext2",
90 .mount = ext4_mount,
91 .kill_sb = kill_block_super,
92 .fs_flags = FS_REQUIRES_DEV,
93};
7f78e035 94MODULE_ALIAS_FS("ext2");
fa7614dd 95MODULE_ALIAS("ext2");
2035e776
TT		 96#define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type)
97#else
98#define IS_EXT2_SB(sb) (0)
99#endif
100
101
ba69f9ab
JK		 102#if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
103static struct file_system_type ext3_fs_type = {
104 .owner = THIS_MODULE,
105 .name = "ext3",
152a0836 106 .mount = ext4_mount,
ba69f9ab
JK		 107 .kill_sb = kill_block_super,
108 .fs_flags = FS_REQUIRES_DEV,
109};
7f78e035 110MODULE_ALIAS_FS("ext3");
fa7614dd 111MODULE_ALIAS("ext3");
ba69f9ab
JK		 112#define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type)
113#else
114#define IS_EXT3_SB(sb) (0)
115#endif
bd81d8ee 116
d25425f8
DW		 117static int ext4_verify_csum_type(struct super_block *sb,
118 struct ext4_super_block *es)
119{
120 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
121 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
122 return 1;
123
124 return es->s_checksum_type == EXT4_CRC32C_CHKSUM;
125}
126
a9c47317
DW		 127static __le32 ext4_superblock_csum(struct super_block *sb,
128 struct ext4_super_block *es)
129{
130 struct ext4_sb_info *sbi = EXT4_SB(sb);
131 int offset = offsetof(struct ext4_super_block, s_checksum);
132 __u32 csum;
133
134 csum = ext4_chksum(sbi, ~0, (char *)es, offset);
135
136 return cpu_to_le32(csum);
137}
138
c197855e
SH		 139static int ext4_superblock_csum_verify(struct super_block *sb,
140 struct ext4_super_block *es)
a9c47317 141{
9aa5d32b 142 if (!ext4_has_metadata_csum(sb))
a9c47317
DW		 143 return 1;
144
145 return es->s_checksum == ext4_superblock_csum(sb, es);
146}
147
06db49e6 148void ext4_superblock_csum_set(struct super_block *sb)
a9c47317 149{
06db49e6
TT		 150 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
151
9aa5d32b 152 if (!ext4_has_metadata_csum(sb))
a9c47317
DW		 153 return;
154
155 es->s_checksum = ext4_superblock_csum(sb, es);
156}
157
9933fc0a
TT		 158void *ext4_kvmalloc(size_t size, gfp_t flags)
159{
160 void *ret;
161
8be04b93 162 ret = kmalloc(size, flags | __GFP_NOWARN);
9933fc0a
TT		 163 if (!ret)
164 ret = __vmalloc(size, flags, PAGE_KERNEL);
165 return ret;
166}
167
168void *ext4_kvzalloc(size_t size, gfp_t flags)
169{
170 void *ret;
171
8be04b93 172 ret = kzalloc(size, flags | __GFP_NOWARN);
9933fc0a
TT		 173 if (!ret)
174 ret = __vmalloc(size, flags | __GFP_ZERO, PAGE_KERNEL);
175 return ret;
176}
177
8fadc143
AR		 178ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
179 struct ext4_group_desc *bg)
bd81d8ee 180{
3a14589c 181 return le32_to_cpu(bg->bg_block_bitmap_lo) |
8fadc143 182 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 183 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 184}
185
8fadc143
AR		 186ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
187 struct ext4_group_desc *bg)
bd81d8ee 188{
5272f837 189 return le32_to_cpu(bg->bg_inode_bitmap_lo) |
8fadc143 190 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 191 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 192}
193
8fadc143
AR		 194ext4_fsblk_t ext4_inode_table(struct super_block *sb,
195 struct ext4_group_desc *bg)
bd81d8ee 196{
5272f837 197 return le32_to_cpu(bg->bg_inode_table_lo) |
8fadc143 198 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 199 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
bd81d8ee
LV		 200}
201
021b65bb
TT		 202__u32 ext4_free_group_clusters(struct super_block *sb,
203 struct ext4_group_desc *bg)
560671a0
AK		 204{
205 return le16_to_cpu(bg->bg_free_blocks_count_lo) |
206 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 207 (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0);
560671a0
AK		 208}
209
210__u32 ext4_free_inodes_count(struct super_block *sb,
211 struct ext4_group_desc *bg)
212{
213 return le16_to_cpu(bg->bg_free_inodes_count_lo) |
214 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 215 (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0);
560671a0
AK		 216}
217
218__u32 ext4_used_dirs_count(struct super_block *sb,
219 struct ext4_group_desc *bg)
220{
221 return le16_to_cpu(bg->bg_used_dirs_count_lo) |
222 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 223 (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0);
560671a0
AK		 224}
225
226__u32 ext4_itable_unused_count(struct super_block *sb,
227 struct ext4_group_desc *bg)
228{
229 return le16_to_cpu(bg->bg_itable_unused_lo) |
230 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 231 (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0);
560671a0
AK		 232}
233
8fadc143
AR		 234void ext4_block_bitmap_set(struct super_block *sb,
235 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 236{
3a14589c 237 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 238 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
239 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 240}
241
8fadc143
AR		 242void ext4_inode_bitmap_set(struct super_block *sb,
243 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 244{
5272f837 245 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 246 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
247 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 248}
249
8fadc143
AR		 250void ext4_inode_table_set(struct super_block *sb,
251 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 252{
5272f837 253 bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 254 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
255 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 256}
257
021b65bb
TT		 258void ext4_free_group_clusters_set(struct super_block *sb,
259 struct ext4_group_desc *bg, __u32 count)
560671a0
AK		 260{
261 bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count);
262 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
263 bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16);
264}
265
266void ext4_free_inodes_set(struct super_block *sb,
267 struct ext4_group_desc *bg, __u32 count)
268{
269 bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count);
270 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
271 bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16);
272}
273
274void ext4_used_dirs_set(struct super_block *sb,
275 struct ext4_group_desc *bg, __u32 count)
276{
277 bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count);
278 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
279 bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16);
280}
281
282void ext4_itable_unused_set(struct super_block *sb,
283 struct ext4_group_desc *bg, __u32 count)
284{
285 bg->bg_itable_unused_lo = cpu_to_le16((__u16)count);
286 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
287 bg->bg_itable_unused_hi = cpu_to_le16(count >> 16);
288}
289
d3d1faf6 290
1c13d5c0
TT		 291static void __save_error_info(struct super_block *sb, const char *func,
292 unsigned int line)
293{
294 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
295
296 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
297 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
298 es->s_last_error_time = cpu_to_le32(get_seconds());
299 strncpy(es->s_last_error_func, func, sizeof(es->s_last_error_func));
300 es->s_last_error_line = cpu_to_le32(line);
301 if (!es->s_first_error_time) {
302 es->s_first_error_time = es->s_last_error_time;
303 strncpy(es->s_first_error_func, func,
304 sizeof(es->s_first_error_func));
305 es->s_first_error_line = cpu_to_le32(line);
306 es->s_first_error_ino = es->s_last_error_ino;
307 es->s_first_error_block = es->s_last_error_block;
308 }
66e61a9e
TT		 309 /*
310 * Start the daily error reporting function if it hasn't been
311 * started already
312 */
313 if (!es->s_error_count)
314 mod_timer(&EXT4_SB(sb)->s_err_report, jiffies + 24*60*60*HZ);
ba39ebb6 315 le32_add_cpu(&es->s_error_count, 1);
1c13d5c0
TT		 316}
317
318static void save_error_info(struct super_block *sb, const char *func,
319 unsigned int line)
320{
321 __save_error_info(sb, func, line);
322 ext4_commit_super(sb, 1);
323}
324
18aadd47
BJ		 325static void ext4_journal_commit_callback(journal_t *journal, transaction_t *txn)
326{
327 struct super_block *sb = journal->j_private;
328 struct ext4_sb_info *sbi = EXT4_SB(sb);
329 int error = is_journal_aborted(journal);
5d3ee208 330 struct ext4_journal_cb_entry *jce;
18aadd47 331
5d3ee208 332 BUG_ON(txn->t_state == T_FINISHED);
18aadd47 333 spin_lock(&sbi->s_md_lock);
5d3ee208
DM		 334 while (!list_empty(&txn->t_private_list)) {
335 jce = list_entry(txn->t_private_list.next,
336 struct ext4_journal_cb_entry, jce_list);
18aadd47
BJ		 337 list_del_init(&jce->jce_list);
338 spin_unlock(&sbi->s_md_lock);
339 jce->jce_func(sb, jce, error);
340 spin_lock(&sbi->s_md_lock);
341 }
342 spin_unlock(&sbi->s_md_lock);
343}
1c13d5c0 344
ac27a0ec
DK		 345/* Deal with the reporting of failure conditions on a filesystem such as
346 * inconsistencies detected or read IO failures.
347 *
348 * On ext2, we can store the error state of the filesystem in the
617ba13b 349 * superblock. That is not possible on ext4, because we may have other
ac27a0ec
DK		 350 * write ordering constraints on the superblock which prevent us from
351 * writing it out straight away; and given that the journal is about to
352 * be aborted, we can't rely on the current, or future, transactions to
353 * write out the superblock safely.
354 *
dab291af 355 * We'll just use the jbd2_journal_abort() error code to record an error in
d6b198bc 356 * the journal instead. On recovery, the journal will complain about
ac27a0ec
DK		 357 * that error until we've noted it down and cleared it.
358 */
359
617ba13b 360static void ext4_handle_error(struct super_block *sb)
ac27a0ec 361{
ac27a0ec
DK		 362 if (sb->s_flags & MS_RDONLY)
363 return;
364
2b2d6d01 365 if (!test_opt(sb, ERRORS_CONT)) {
617ba13b 366 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 367
4ab2f15b 368 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
ac27a0ec 369 if (journal)
dab291af 370 jbd2_journal_abort(journal, -EIO);
ac27a0ec 371 }
2b2d6d01 372 if (test_opt(sb, ERRORS_RO)) {
b31e1552 373 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
4418e141
DM		 374 /*
375 * Make sure updated value of ->s_mount_flags will be visible
376 * before ->s_flags update
377 */
378 smp_wmb();
ac27a0ec
DK		 379 sb->s_flags |= MS_RDONLY;
380 }
ac27a0ec 381 if (test_opt(sb, ERRORS_PANIC))
617ba13b 382 panic("EXT4-fs (device %s): panic forced after error\n",
ac27a0ec
DK		 383 sb->s_id);
384}
385
efbed4dc
TT		 386#define ext4_error_ratelimit(sb) \
387 ___ratelimit(&(EXT4_SB(sb)->s_err_ratelimit_state), \
388 "EXT4-fs error")
389
12062ddd 390void __ext4_error(struct super_block *sb, const char *function,
c398eda0 391 unsigned int line, const char *fmt, ...)
ac27a0ec 392{
0ff2ea7d 393 struct va_format vaf;
ac27a0ec
DK		 394 va_list args;
395
efbed4dc
TT		 396 if (ext4_error_ratelimit(sb)) {
397 va_start(args, fmt);
398 vaf.fmt = fmt;
399 vaf.va = &args;
400 printk(KERN_CRIT
401 "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n",
402 sb->s_id, function, line, current->comm, &vaf);
403 va_end(args);
404 }
f3fc0210 405 save_error_info(sb, function, line);
617ba13b 406 ext4_handle_error(sb);
ac27a0ec
DK		 407}
408
e7c96e8e
JP		 409void __ext4_error_inode(struct inode *inode, const char *function,
410 unsigned int line, ext4_fsblk_t block,
411 const char *fmt, ...)
273df556
FM		 412{
413 va_list args;
f7c21177 414 struct va_format vaf;
1c13d5c0 415 struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
273df556 416
1c13d5c0
TT		 417 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
418 es->s_last_error_block = cpu_to_le64(block);
efbed4dc
TT		 419 if (ext4_error_ratelimit(inode->i_sb)) {
420 va_start(args, fmt);
421 vaf.fmt = fmt;
422 vaf.va = &args;
423 if (block)
424 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
425 "inode #%lu: block %llu: comm %s: %pV\n",
426 inode->i_sb->s_id, function, line, inode->i_ino,
427 block, current->comm, &vaf);
428 else
429 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
430 "inode #%lu: comm %s: %pV\n",
431 inode->i_sb->s_id, function, line, inode->i_ino,
432 current->comm, &vaf);
433 va_end(args);
434 }
1c13d5c0 435 save_error_info(inode->i_sb, function, line);
273df556
FM		 436 ext4_handle_error(inode->i_sb);
437}
438
e7c96e8e
JP		 439void __ext4_error_file(struct file *file, const char *function,
440 unsigned int line, ext4_fsblk_t block,
441 const char *fmt, ...)
273df556
FM		 442{
443 va_list args;
f7c21177 444 struct va_format vaf;
1c13d5c0 445 struct ext4_super_block *es;
496ad9aa 446 struct inode *inode = file_inode(file);
273df556
FM		 447 char pathname[80], *path;
448
1c13d5c0
TT		 449 es = EXT4_SB(inode->i_sb)->s_es;
450 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
efbed4dc
TT		 451 if (ext4_error_ratelimit(inode->i_sb)) {
452 path = d_path(&(file->f_path), pathname, sizeof(pathname));
453 if (IS_ERR(path))
454 path = "(unknown)";
455 va_start(args, fmt);
456 vaf.fmt = fmt;
457 vaf.va = &args;
458 if (block)
459 printk(KERN_CRIT
460 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
461 "block %llu: comm %s: path %s: %pV\n",
462 inode->i_sb->s_id, function, line, inode->i_ino,
463 block, current->comm, path, &vaf);
464 else
465 printk(KERN_CRIT
466 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
467 "comm %s: path %s: %pV\n",
468 inode->i_sb->s_id, function, line, inode->i_ino,
469 current->comm, path, &vaf);
470 va_end(args);
471 }
1c13d5c0 472 save_error_info(inode->i_sb, function, line);
273df556
FM		 473 ext4_handle_error(inode->i_sb);
474}
475
722887dd
TT		 476const char *ext4_decode_error(struct super_block *sb, int errno,
477 char nbuf[16])
ac27a0ec
DK		 478{
479 char *errstr = NULL;
480
481 switch (errno) {
482 case -EIO:
483 errstr = "IO failure";
484 break;
485 case -ENOMEM:
486 errstr = "Out of memory";
487 break;
488 case -EROFS:
78f1ddbb
TT		 489 if (!sb || (EXT4_SB(sb)->s_journal &&
490 EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT))
ac27a0ec
DK		 491 errstr = "Journal has aborted";
492 else
493 errstr = "Readonly filesystem";
494 break;
495 default:
496 /* If the caller passed in an extra buffer for unknown
497 * errors, textualise them now. Else we just return
498 * NULL. */
499 if (nbuf) {
500 /* Check for truncated error codes... */
501 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
502 errstr = nbuf;
503 }
504 break;
505 }
506
507 return errstr;
508}
509
617ba13b 510/* __ext4_std_error decodes expected errors from journaling functions
ac27a0ec
DK		 511 * automatically and invokes the appropriate error response. */
512
c398eda0
TT		 513void __ext4_std_error(struct super_block *sb, const char *function,
514 unsigned int line, int errno)
ac27a0ec
DK		 515{
516 char nbuf[16];
517 const char *errstr;
518
519 /* Special case: if the error is EROFS, and we're not already
520 * inside a transaction, then there's really no point in logging
521 * an error. */
522 if (errno == -EROFS && journal_current_handle() == NULL &&
523 (sb->s_flags & MS_RDONLY))
524 return;
525
efbed4dc
TT		 526 if (ext4_error_ratelimit(sb)) {
527 errstr = ext4_decode_error(sb, errno, nbuf);
528 printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n",
529 sb->s_id, function, line, errstr);
530 }
ac27a0ec 531
efbed4dc 532 save_error_info(sb, function, line);
617ba13b 533 ext4_handle_error(sb);
ac27a0ec
DK		 534}
535
536/*
617ba13b 537 * ext4_abort is a much stronger failure handler than ext4_error. The
ac27a0ec
DK		 538 * abort function may be used to deal with unrecoverable failures such
539 * as journal IO errors or ENOMEM at a critical moment in log management.
540 *
541 * We unconditionally force the filesystem into an ABORT|READONLY state,
542 * unless the error response on the fs has been set to panic in which
543 * case we take the easy way out and panic immediately.
544 */
545
c67d859e 546void __ext4_abort(struct super_block *sb, const char *function,
c398eda0 547 unsigned int line, const char *fmt, ...)
ac27a0ec
DK		 548{
549 va_list args;
550
1c13d5c0 551 save_error_info(sb, function, line);
ac27a0ec 552 va_start(args, fmt);
c398eda0
TT		 553 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: ", sb->s_id,
554 function, line);
ac27a0ec
DK		 555 vprintk(fmt, args);
556 printk("\n");
557 va_end(args);
558
1c13d5c0
TT		 559 if ((sb->s_flags & MS_RDONLY) == 0) {
560 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
1c13d5c0 561 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
4418e141
DM		 562 /*
563 * Make sure updated value of ->s_mount_flags will be visible
564 * before ->s_flags update
565 */
566 smp_wmb();
567 sb->s_flags |= MS_RDONLY;
1c13d5c0
TT		 568 if (EXT4_SB(sb)->s_journal)
569 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
570 save_error_info(sb, function, line);
571 }
ac27a0ec 572 if (test_opt(sb, ERRORS_PANIC))
617ba13b 573 panic("EXT4-fs panic from previous error\n");
ac27a0ec
DK		 574}
575
e7c96e8e
JP		 576void __ext4_msg(struct super_block *sb,
577 const char *prefix, const char *fmt, ...)
b31e1552 578{
0ff2ea7d 579 struct va_format vaf;
b31e1552
ES		 580 va_list args;
581
efbed4dc
TT		 582 if (!___ratelimit(&(EXT4_SB(sb)->s_msg_ratelimit_state), "EXT4-fs"))
583 return;
584
b31e1552 585 va_start(args, fmt);
0ff2ea7d
JP		 586 vaf.fmt = fmt;
587 vaf.va = &args;
588 printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
b31e1552
ES		 589 va_end(args);
590}
591
12062ddd 592void __ext4_warning(struct super_block *sb, const char *function,
c398eda0 593 unsigned int line, const char *fmt, ...)
ac27a0ec 594{
0ff2ea7d 595 struct va_format vaf;
ac27a0ec
DK		 596 va_list args;
597
efbed4dc
TT		 598 if (!___ratelimit(&(EXT4_SB(sb)->s_warning_ratelimit_state),
599 "EXT4-fs warning"))
600 return;
601
ac27a0ec 602 va_start(args, fmt);
0ff2ea7d
JP		 603 vaf.fmt = fmt;
604 vaf.va = &args;
605 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: %pV\n",
606 sb->s_id, function, line, &vaf);
ac27a0ec
DK		 607 va_end(args);
608}
609
e29136f8
TT		 610void __ext4_grp_locked_error(const char *function, unsigned int line,
611 struct super_block *sb, ext4_group_t grp,
612 unsigned long ino, ext4_fsblk_t block,
613 const char *fmt, ...)
5d1b1b3f
AK		 614__releases(bitlock)
615__acquires(bitlock)
616{
0ff2ea7d 617 struct va_format vaf;
5d1b1b3f
AK		 618 va_list args;
619 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
620
1c13d5c0
TT		 621 es->s_last_error_ino = cpu_to_le32(ino);
622 es->s_last_error_block = cpu_to_le64(block);
623 __save_error_info(sb, function, line);
0ff2ea7d 624
efbed4dc
TT		 625 if (ext4_error_ratelimit(sb)) {
626 va_start(args, fmt);
627 vaf.fmt = fmt;
628 vaf.va = &args;
629 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u, ",
630 sb->s_id, function, line, grp);
631 if (ino)
632 printk(KERN_CONT "inode %lu: ", ino);
633 if (block)
634 printk(KERN_CONT "block %llu:",
635 (unsigned long long) block);
636 printk(KERN_CONT "%pV\n", &vaf);
637 va_end(args);
638 }
5d1b1b3f
AK		 639
640 if (test_opt(sb, ERRORS_CONT)) {
e2d67052 641 ext4_commit_super(sb, 0);
5d1b1b3f
AK		 642 return;
643 }
1c13d5c0 644
5d1b1b3f
AK		 645 ext4_unlock_group(sb, grp);
646 ext4_handle_error(sb);
647 /*
648 * We only get here in the ERRORS_RO case; relocking the group
649 * may be dangerous, but nothing bad will happen since the
650 * filesystem will have already been marked read/only and the
651 * journal has been aborted. We return 1 as a hint to callers
652 * who might what to use the return value from
25985edc 653 * ext4_grp_locked_error() to distinguish between the
5d1b1b3f
AK		 654 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
655 * aggressively from the ext4 function in question, with a
656 * more appropriate error code.
657 */
658 ext4_lock_group(sb, grp);
659 return;
660}
661
617ba13b 662void ext4_update_dynamic_rev(struct super_block *sb)
ac27a0ec 663{
617ba13b 664 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
ac27a0ec 665
617ba13b 666 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
ac27a0ec
DK		 667 return;
668
12062ddd 669 ext4_warning(sb,
ac27a0ec
DK		 670 "updating to rev %d because of new feature flag, "
671 "running e2fsck is recommended",
617ba13b 672 EXT4_DYNAMIC_REV);
ac27a0ec 673
617ba13b
MC		 674 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
675 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
676 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
ac27a0ec
DK		 677 /* leave es->s_feature_*compat flags alone */
678 /* es->s_uuid will be set by e2fsck if empty */
679
680 /*
681 * The rest of the superblock fields should be zero, and if not it
682 * means they are likely already in use, so leave them alone. We
683 * can leave it up to e2fsck to clean up any inconsistencies there.
684 */
685}
686
687/*
688 * Open the external journal device
689 */
b31e1552 690static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb)
ac27a0ec
DK		 691{
692 struct block_device *bdev;
693 char b[BDEVNAME_SIZE];
694
d4d77629 695 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
ac27a0ec
DK		 696 if (IS_ERR(bdev))
697 goto fail;
698 return bdev;
699
700fail:
b31e1552 701 ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld",
ac27a0ec
DK		 702 __bdevname(dev, b), PTR_ERR(bdev));
703 return NULL;
704}
705
706/*
707 * Release the journal device
708 */
4385bab1 709static void ext4_blkdev_put(struct block_device *bdev)
ac27a0ec 710{
4385bab1 711 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
ac27a0ec
DK		 712}
713
4385bab1 714static void ext4_blkdev_remove(struct ext4_sb_info *sbi)
ac27a0ec
DK		 715{
716 struct block_device *bdev;
ac27a0ec
DK		 717 bdev = sbi->journal_bdev;
718 if (bdev) {
4385bab1 719 ext4_blkdev_put(bdev);
ac27a0ec
DK		 720 sbi->journal_bdev = NULL;
721 }
ac27a0ec
DK		 722}
723
724static inline struct inode *orphan_list_entry(struct list_head *l)
725{
617ba13b 726 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
ac27a0ec
DK		 727}
728
617ba13b 729static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
ac27a0ec
DK		 730{
731 struct list_head *l;
732
b31e1552
ES		 733 ext4_msg(sb, KERN_ERR, "sb orphan head is %d",
734 le32_to_cpu(sbi->s_es->s_last_orphan));
ac27a0ec
DK		 735
736 printk(KERN_ERR "sb_info orphan list:\n");
737 list_for_each(l, &sbi->s_orphan) {
738 struct inode *inode = orphan_list_entry(l);
739 printk(KERN_ERR " "
740 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
741 inode->i_sb->s_id, inode->i_ino, inode,
742 inode->i_mode, inode->i_nlink,
743 NEXT_ORPHAN(inode));
744 }
745}
746
2b2d6d01 747static void ext4_put_super(struct super_block *sb)
ac27a0ec 748{
617ba13b
MC		 749 struct ext4_sb_info *sbi = EXT4_SB(sb);
750 struct ext4_super_block *es = sbi->s_es;
ef2cabf7 751 int i, err;
ac27a0ec 752
857ac889 753 ext4_unregister_li_request(sb);
e0ccfd95
CH		 754 dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
755
2e8fa54e 756 flush_workqueue(sbi->rsv_conversion_wq);
2e8fa54e 757 destroy_workqueue(sbi->rsv_conversion_wq);
4c0425ff 758
0390131b
FM		 759 if (sbi->s_journal) {
760 err = jbd2_journal_destroy(sbi->s_journal);
761 sbi->s_journal = NULL;
762 if (err < 0)
c67d859e 763 ext4_abort(sb, "Couldn't clean up the journal");
0390131b 764 }
d4edac31 765
d3922a77 766 ext4_es_unregister_shrinker(sbi);
9105bb14 767 del_timer_sync(&sbi->s_err_report);
d4edac31
JB		 768 ext4_release_system_zone(sb);
769 ext4_mb_release(sb);
770 ext4_ext_release(sb);
771 ext4_xattr_put_super(sb);
772
ac27a0ec 773 if (!(sb->s_flags & MS_RDONLY)) {
617ba13b 774 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
ac27a0ec 775 es->s_state = cpu_to_le16(sbi->s_mount_state);
ac27a0ec 776 }
58c5873a 777 if (!(sb->s_flags & MS_RDONLY))
a8e25a83
AB		 778 ext4_commit_super(sb, 1);
779
240799cd 780 if (sbi->s_proc) {
66acdcf4 781 remove_proc_entry("options", sbi->s_proc);
9f6200bb 782 remove_proc_entry(sb->s_id, ext4_proc_root);
240799cd 783 }
3197ebdb 784 kobject_del(&sbi->s_kobj);
ac27a0ec
DK		 785
786 for (i = 0; i < sbi->s_gdb_count; i++)
787 brelse(sbi->s_group_desc[i]);
b93b41d4
AV		 788 kvfree(sbi->s_group_desc);
789 kvfree(sbi->s_flex_groups);
57042651 790 percpu_counter_destroy(&sbi->s_freeclusters_counter);
ac27a0ec
DK		 791 percpu_counter_destroy(&sbi->s_freeinodes_counter);
792 percpu_counter_destroy(&sbi->s_dirs_counter);
57042651 793 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
ac27a0ec
DK		 794 brelse(sbi->s_sbh);
795#ifdef CONFIG_QUOTA
a2d4a646 796 for (i = 0; i < EXT4_MAXQUOTAS; i++)
ac27a0ec
DK		 797 kfree(sbi->s_qf_names[i]);
798#endif
799
800 /* Debugging code just in case the in-memory inode orphan list
801 * isn't empty. The on-disk one can be non-empty if we've
802 * detected an error and taken the fs readonly, but the
803 * in-memory list had better be clean by this point. */
804 if (!list_empty(&sbi->s_orphan))
805 dump_orphan_list(sb, sbi);
806 J_ASSERT(list_empty(&sbi->s_orphan));
807
f98393a6 808 invalidate_bdev(sb->s_bdev);
ac27a0ec
DK		 809 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
810 /*
811 * Invalidate the journal device's buffers. We don't want them
812 * floating about in memory - the physical journal device may
813 * hotswapped, and it breaks the `ro-after' testing code.
814 */
815 sync_blockdev(sbi->journal_bdev);
f98393a6 816 invalidate_bdev(sbi->journal_bdev);
617ba13b 817 ext4_blkdev_remove(sbi);
ac27a0ec 818 }
9c191f70
M		 819 if (sbi->s_mb_cache) {
820 ext4_xattr_destroy_cache(sbi->s_mb_cache);
821 sbi->s_mb_cache = NULL;
822 }
c5e06d10
JL		 823 if (sbi->s_mmp_tsk)
824 kthread_stop(sbi->s_mmp_tsk);
ac27a0ec 825 sb->s_fs_info = NULL;
3197ebdb
TT		 826 /*
827 * Now that we are completely done shutting down the
828 * superblock, we need to actually destroy the kobject.
829 */
3197ebdb
TT		 830 kobject_put(&sbi->s_kobj);
831 wait_for_completion(&sbi->s_kobj_unregister);
0441984a
DW		 832 if (sbi->s_chksum_driver)
833 crypto_free_shash(sbi->s_chksum_driver);
705895b6 834 kfree(sbi->s_blockgroup_lock);
ac27a0ec 835 kfree(sbi);
ac27a0ec
DK		 836}
837
e18b890b 838static struct kmem_cache *ext4_inode_cachep;
ac27a0ec
DK		 839
840/*
841 * Called inside transaction, so use GFP_NOFS
842 */
617ba13b 843static struct inode *ext4_alloc_inode(struct super_block *sb)
ac27a0ec 844{
617ba13b 845 struct ext4_inode_info *ei;
ac27a0ec 846
e6b4f8da 847 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
ac27a0ec
DK		 848 if (!ei)
849 return NULL;
0b8e58a1 850
ac27a0ec 851 ei->vfs_inode.i_version = 1;
202ee5df 852 spin_lock_init(&ei->i_raw_lock);
c9de560d
AT		 853 INIT_LIST_HEAD(&ei->i_prealloc_list);
854 spin_lock_init(&ei->i_prealloc_lock);
9a26b661
ZL		 855 ext4_es_init_tree(&ei->i_es_tree);
856 rwlock_init(&ei->i_es_lock);
edaa53ca 857 INIT_LIST_HEAD(&ei->i_es_list);
eb68d0e2 858 ei->i_es_all_nr = 0;
edaa53ca 859 ei->i_es_shk_nr = 0;
dd475925 860 ei->i_es_shrink_lblk = 0;
d2a17637
MC		 861 ei->i_reserved_data_blocks = 0;
862 ei->i_reserved_meta_blocks = 0;
863 ei->i_allocated_meta_blocks = 0;
9d0be502 864 ei->i_da_metadata_calc_len = 0;
7e731bc9 865 ei->i_da_metadata_calc_last_lblock = 0;
d2a17637 866 spin_lock_init(&(ei->i_block_reservation_lock));
a9e7f447
DM		 867#ifdef CONFIG_QUOTA
868 ei->i_reserved_quota = 0;
96c7e0d9 869 memset(&ei->i_dquot, 0, sizeof(ei->i_dquot));
a9e7f447 870#endif
8aefcd55 871 ei->jinode = NULL;
2e8fa54e 872 INIT_LIST_HEAD(&ei->i_rsv_conversion_list);
744692dc 873 spin_lock_init(&ei->i_completed_io_lock);
b436b9be
JK		 874 ei->i_sync_tid = 0;
875 ei->i_datasync_tid = 0;
f7ad6d2e 876 atomic_set(&ei->i_ioend_count, 0);
e27f41e1 877 atomic_set(&ei->i_unwritten, 0);
2e8fa54e 878 INIT_WORK(&ei->i_rsv_conversion_work, ext4_end_io_rsv_work);
b30ab0e0
MH		 879#ifdef CONFIG_EXT4_FS_ENCRYPTION
880 ei->i_encryption_key.mode = EXT4_ENCRYPTION_MODE_INVALID;
881#endif
0b8e58a1 882
ac27a0ec
DK		 883 return &ei->vfs_inode;
884}
885
7ff9c073
TT		 886static int ext4_drop_inode(struct inode *inode)
887{
888 int drop = generic_drop_inode(inode);
889
890 trace_ext4_drop_inode(inode, drop);
891 return drop;
892}
893
fa0d7e3d
NP		 894static void ext4_i_callback(struct rcu_head *head)
895{
896 struct inode *inode = container_of(head, struct inode, i_rcu);
fa0d7e3d
NP		 897 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
898}
899
617ba13b 900static void ext4_destroy_inode(struct inode *inode)
ac27a0ec 901{
9f7dd93d 902 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
b31e1552
ES		 903 ext4_msg(inode->i_sb, KERN_ERR,
904 "Inode %lu (%p): orphan list check failed!",
905 inode->i_ino, EXT4_I(inode));
9f7dd93d
VA		 906 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
907 EXT4_I(inode), sizeof(struct ext4_inode_info),
908 true);
909 dump_stack();
910 }
fa0d7e3d 911 call_rcu(&inode->i_rcu, ext4_i_callback);
ac27a0ec
DK		 912}
913
51cc5068 914static void init_once(void *foo)
ac27a0ec 915{
617ba13b 916 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
ac27a0ec 917
a35afb83 918 INIT_LIST_HEAD(&ei->i_orphan);
a35afb83 919 init_rwsem(&ei->xattr_sem);
0e855ac8 920 init_rwsem(&ei->i_data_sem);
a35afb83 921 inode_init_once(&ei->vfs_inode);
ac27a0ec
DK		 922}
923
e67bc2b3 924static int __init init_inodecache(void)
ac27a0ec 925{
617ba13b
MC		 926 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
927 sizeof(struct ext4_inode_info),
ac27a0ec
DK		 928 0, (SLAB_RECLAIM_ACCOUNT|
929 SLAB_MEM_SPREAD),
20c2df83 930 init_once);
617ba13b 931 if (ext4_inode_cachep == NULL)
ac27a0ec
DK		 932 return -ENOMEM;
933 return 0;
934}
935
936static void destroy_inodecache(void)
937{
8c0a8537
KS		 938 /*
939 * Make sure all delayed rcu free inodes are flushed before we
940 * destroy cache.
941 */
942 rcu_barrier();
617ba13b 943 kmem_cache_destroy(ext4_inode_cachep);
ac27a0ec
DK		 944}
945
0930fcc1 946void ext4_clear_inode(struct inode *inode)
ac27a0ec 947{
0930fcc1 948 invalidate_inode_buffers(inode);
dbd5768f 949 clear_inode(inode);
9f754758 950 dquot_drop(inode);
c2ea3fde 951 ext4_discard_preallocations(inode);
51865fda 952 ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS);
8aefcd55
TT		 953 if (EXT4_I(inode)->jinode) {
954 jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode),
955 EXT4_I(inode)->jinode);
956 jbd2_free_inode(EXT4_I(inode)->jinode);
957 EXT4_I(inode)->jinode = NULL;
958 }
ac27a0ec
DK		 959}
960
1b961ac0 961static struct inode *ext4_nfs_get_inode(struct super_block *sb,
0b8e58a1 962 u64 ino, u32 generation)
ac27a0ec 963{
ac27a0ec 964 struct inode *inode;
ac27a0ec 965
617ba13b 966 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
ac27a0ec 967 return ERR_PTR(-ESTALE);
617ba13b 968 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
ac27a0ec
DK		 969 return ERR_PTR(-ESTALE);
970
971 /* iget isn't really right if the inode is currently unallocated!!
972 *
617ba13b 973 * ext4_read_inode will return a bad_inode if the inode had been
ac27a0ec
DK		 974 * deleted, so we should be safe.
975 *
976 * Currently we don't know the generation for parent directory, so
977 * a generation of 0 means "accept any"
978 */
f4bb2981 979 inode = ext4_iget_normal(sb, ino);
1d1fe1ee
DH		 980 if (IS_ERR(inode))
981 return ERR_CAST(inode);
982 if (generation && inode->i_generation != generation) {
ac27a0ec
DK		 983 iput(inode);
984 return ERR_PTR(-ESTALE);
985 }
1b961ac0
CH		 986
987 return inode;
988}
989
990static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
0b8e58a1 991 int fh_len, int fh_type)
1b961ac0
CH		 992{
993 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
994 ext4_nfs_get_inode);
995}
996
997static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
0b8e58a1 998 int fh_len, int fh_type)
1b961ac0
CH		 999{
1000 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
1001 ext4_nfs_get_inode);
ac27a0ec
DK		 1002}
1003
c39a7f84
TO		 1004/*
1005 * Try to release metadata pages (indirect blocks, directories) which are
1006 * mapped via the block device. Since these pages could have journal heads
1007 * which would prevent try_to_free_buffers() from freeing them, we must use
1008 * jbd2 layer's try_to_free_buffers() function to release them.
1009 */
0b8e58a1
AD		 1010static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
1011 gfp_t wait)
c39a7f84
TO		 1012{
1013 journal_t *journal = EXT4_SB(sb)->s_journal;
1014
1015 WARN_ON(PageChecked(page));
1016 if (!page_has_buffers(page))
1017 return 0;
1018 if (journal)
1019 return jbd2_journal_try_to_free_buffers(journal, page,
1020 wait & ~__GFP_WAIT);
1021 return try_to_free_buffers(page);
1022}
1023
ac27a0ec 1024#ifdef CONFIG_QUOTA
af5bc92d 1025#define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
2b2d6d01 1026#define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
ac27a0ec 1027
617ba13b
MC		 1028static int ext4_write_dquot(struct dquot *dquot);
1029static int ext4_acquire_dquot(struct dquot *dquot);
1030static int ext4_release_dquot(struct dquot *dquot);
1031static int ext4_mark_dquot_dirty(struct dquot *dquot);
1032static int ext4_write_info(struct super_block *sb, int type);
6f28e087 1033static int ext4_quota_on(struct super_block *sb, int type, int format_id,
f00c9e44 1034 struct path *path);
ca0e05e4 1035static int ext4_quota_off(struct super_block *sb, int type);
617ba13b
MC		 1036static int ext4_quota_on_mount(struct super_block *sb, int type);
1037static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec 1038 size_t len, loff_t off);
617ba13b 1039static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec 1040 const char *data, size_t len, loff_t off);
7c319d32
AK		 1041static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
1042 unsigned int flags);
1043static int ext4_enable_quotas(struct super_block *sb);
ac27a0ec 1044
96c7e0d9
JK		 1045static struct dquot **ext4_get_dquots(struct inode *inode)
1046{
1047 return EXT4_I(inode)->i_dquot;
1048}
1049
61e225dc 1050static const struct dquot_operations ext4_quota_operations = {
60e58e0f 1051 .get_reserved_space = ext4_get_reserved_space,
617ba13b
MC		 1052 .write_dquot = ext4_write_dquot,
1053 .acquire_dquot = ext4_acquire_dquot,
1054 .release_dquot = ext4_release_dquot,
1055 .mark_dirty = ext4_mark_dquot_dirty,
a5b5ee32
JK		 1056 .write_info = ext4_write_info,
1057 .alloc_dquot = dquot_alloc,
1058 .destroy_dquot = dquot_destroy,
ac27a0ec
DK		 1059};
1060
0d54b217 1061static const struct quotactl_ops ext4_qctl_operations = {
617ba13b 1062 .quota_on = ext4_quota_on,
ca0e05e4 1063 .quota_off = ext4_quota_off,
287a8095 1064 .quota_sync = dquot_quota_sync,
0a240339 1065 .get_state = dquot_get_state,
287a8095
CH		 1066 .set_info = dquot_set_dqinfo,
1067 .get_dqblk = dquot_get_dqblk,
1068 .set_dqblk = dquot_set_dqblk
ac27a0ec
DK		 1069};
1070#endif
1071
ee9b6d61 1072static const struct super_operations ext4_sops = {
617ba13b
MC		 1073 .alloc_inode = ext4_alloc_inode,
1074 .destroy_inode = ext4_destroy_inode,
617ba13b
MC		 1075 .write_inode = ext4_write_inode,
1076 .dirty_inode = ext4_dirty_inode,
7ff9c073 1077 .drop_inode = ext4_drop_inode,
0930fcc1 1078 .evict_inode = ext4_evict_inode,
617ba13b 1079 .put_super = ext4_put_super,
617ba13b 1080 .sync_fs = ext4_sync_fs,
c4be0c1d
TS		 1081 .freeze_fs = ext4_freeze,
1082 .unfreeze_fs = ext4_unfreeze,
617ba13b
MC		 1083 .statfs = ext4_statfs,
1084 .remount_fs = ext4_remount,
617ba13b 1085 .show_options = ext4_show_options,
ac27a0ec 1086#ifdef CONFIG_QUOTA
617ba13b
MC		 1087 .quota_read = ext4_quota_read,
1088 .quota_write = ext4_quota_write,
96c7e0d9 1089 .get_dquots = ext4_get_dquots,
ac27a0ec 1090#endif
c39a7f84 1091 .bdev_try_to_free_page = bdev_try_to_free_page,
ac27a0ec
DK		 1092};
1093
39655164 1094static const struct export_operations ext4_export_ops = {
1b961ac0
CH		 1095 .fh_to_dentry = ext4_fh_to_dentry,
1096 .fh_to_parent = ext4_fh_to_parent,
617ba13b 1097 .get_parent = ext4_get_parent,
ac27a0ec
DK		 1098};
1099
1100enum {
1101 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
1102 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
72578c33 1103 Opt_nouid32, Opt_debug, Opt_removed,
ac27a0ec 1104 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
72578c33 1105 Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload,
ad4eec61
ES		 1106 Opt_commit, Opt_min_batch_time, Opt_max_batch_time, Opt_journal_dev,
1107 Opt_journal_path, Opt_journal_checksum, Opt_journal_async_commit,
ac27a0ec 1108 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
6ddb2447 1109 Opt_data_err_abort, Opt_data_err_ignore, Opt_test_dummy_encryption,
ac27a0ec 1110 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
5a20bdfc 1111 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
ee4a3fcd 1112 Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err,
923ae0ff 1113 Opt_usrquota, Opt_grpquota, Opt_i_version, Opt_dax,
1449032b 1114 Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_mblk_io_submit,
a26f4992 1115 Opt_lazytime, Opt_nolazytime,
1449032b 1116 Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity,
5328e635 1117 Opt_inode_readahead_blks, Opt_journal_ioprio,
744692dc 1118 Opt_dioread_nolock, Opt_dioread_lock,
fc6cb1cd 1119 Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable,
c6d3d56d 1120 Opt_max_dir_size_kb, Opt_nojournal_checksum,
ac27a0ec
DK		 1121};
1122
a447c093 1123static const match_table_t tokens = {
ac27a0ec
DK		 1124 {Opt_bsd_df, "bsddf"},
1125 {Opt_minix_df, "minixdf"},
1126 {Opt_grpid, "grpid"},
1127 {Opt_grpid, "bsdgroups"},
1128 {Opt_nogrpid, "nogrpid"},
1129 {Opt_nogrpid, "sysvgroups"},
1130 {Opt_resgid, "resgid=%u"},
1131 {Opt_resuid, "resuid=%u"},
1132 {Opt_sb, "sb=%u"},
1133 {Opt_err_cont, "errors=continue"},
1134 {Opt_err_panic, "errors=panic"},
1135 {Opt_err_ro, "errors=remount-ro"},
1136 {Opt_nouid32, "nouid32"},
ac27a0ec 1137 {Opt_debug, "debug"},
72578c33
TT		 1138 {Opt_removed, "oldalloc"},
1139 {Opt_removed, "orlov"},
ac27a0ec
DK		 1140 {Opt_user_xattr, "user_xattr"},
1141 {Opt_nouser_xattr, "nouser_xattr"},
1142 {Opt_acl, "acl"},
1143 {Opt_noacl, "noacl"},
e3bb52ae 1144 {Opt_noload, "norecovery"},
5a916be1 1145 {Opt_noload, "noload"},
72578c33
TT		 1146 {Opt_removed, "nobh"},
1147 {Opt_removed, "bh"},
ac27a0ec 1148 {Opt_commit, "commit=%u"},
30773840
TT		 1149 {Opt_min_batch_time, "min_batch_time=%u"},
1150 {Opt_max_batch_time, "max_batch_time=%u"},
ac27a0ec 1151 {Opt_journal_dev, "journal_dev=%u"},
ad4eec61 1152 {Opt_journal_path, "journal_path=%s"},
818d276c 1153 {Opt_journal_checksum, "journal_checksum"},
c6d3d56d 1154 {Opt_nojournal_checksum, "nojournal_checksum"},
818d276c 1155 {Opt_journal_async_commit, "journal_async_commit"},
ac27a0ec
DK		 1156 {Opt_abort, "abort"},
1157 {Opt_data_journal, "data=journal"},
1158 {Opt_data_ordered, "data=ordered"},
1159 {Opt_data_writeback, "data=writeback"},
5bf5683a
HK		 1160 {Opt_data_err_abort, "data_err=abort"},
1161 {Opt_data_err_ignore, "data_err=ignore"},
ac27a0ec
DK		 1162 {Opt_offusrjquota, "usrjquota="},
1163 {Opt_usrjquota, "usrjquota=%s"},
1164 {Opt_offgrpjquota, "grpjquota="},
1165 {Opt_grpjquota, "grpjquota=%s"},
1166 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
1167 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
5a20bdfc 1168 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
ac27a0ec
DK		 1169 {Opt_grpquota, "grpquota"},
1170 {Opt_noquota, "noquota"},
1171 {Opt_quota, "quota"},
1172 {Opt_usrquota, "usrquota"},
1173 {Opt_barrier, "barrier=%u"},
06705bff
TT		 1174 {Opt_barrier, "barrier"},
1175 {Opt_nobarrier, "nobarrier"},
25ec56b5 1176 {Opt_i_version, "i_version"},
923ae0ff 1177 {Opt_dax, "dax"},
c9de560d 1178 {Opt_stripe, "stripe=%u"},
64769240 1179 {Opt_delalloc, "delalloc"},
a26f4992
TT		 1180 {Opt_lazytime, "lazytime"},
1181 {Opt_nolazytime, "nolazytime"},
dd919b98 1182 {Opt_nodelalloc, "nodelalloc"},
36ade451
JK		 1183 {Opt_removed, "mblk_io_submit"},
1184 {Opt_removed, "nomblk_io_submit"},
6fd058f7
TT		 1185 {Opt_block_validity, "block_validity"},
1186 {Opt_noblock_validity, "noblock_validity"},
240799cd 1187 {Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
b3881f74 1188 {Opt_journal_ioprio, "journal_ioprio=%u"},
afd4672d 1189 {Opt_auto_da_alloc, "auto_da_alloc=%u"},
06705bff
TT		 1190 {Opt_auto_da_alloc, "auto_da_alloc"},
1191 {Opt_noauto_da_alloc, "noauto_da_alloc"},
744692dc
JZ		 1192 {Opt_dioread_nolock, "dioread_nolock"},
1193 {Opt_dioread_lock, "dioread_lock"},
5328e635
ES		 1194 {Opt_discard, "discard"},
1195 {Opt_nodiscard, "nodiscard"},
fc6cb1cd
TT		 1196 {Opt_init_itable, "init_itable=%u"},
1197 {Opt_init_itable, "init_itable"},
1198 {Opt_noinit_itable, "noinit_itable"},
df981d03 1199 {Opt_max_dir_size_kb, "max_dir_size_kb=%u"},
6ddb2447 1200 {Opt_test_dummy_encryption, "test_dummy_encryption"},
c7198b9c
TT		 1201 {Opt_removed, "check=none"}, /* mount option from ext2/3 */
1202 {Opt_removed, "nocheck"}, /* mount option from ext2/3 */
1203 {Opt_removed, "reservation"}, /* mount option from ext2/3 */
1204 {Opt_removed, "noreservation"}, /* mount option from ext2/3 */
1205 {Opt_removed, "journal=%u"}, /* mount option from ext2/3 */
f3f12faa 1206 {Opt_err, NULL},
ac27a0ec
DK		 1207};
1208
617ba13b 1209static ext4_fsblk_t get_sb_block(void **data)
ac27a0ec 1210{
617ba13b 1211 ext4_fsblk_t sb_block;
ac27a0ec
DK		 1212 char *options = (char *) *data;
1213
1214 if (!options || strncmp(options, "sb=", 3) != 0)
1215 return 1; /* Default location */
0b8e58a1 1216
ac27a0ec 1217 options += 3;
0b8e58a1 1218 /* TODO: use simple_strtoll with >32bit ext4 */
ac27a0ec
DK		 1219 sb_block = simple_strtoul(options, &options, 0);
1220 if (*options && *options != ',') {
4776004f 1221 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
ac27a0ec
DK		 1222 (char *) *data);
1223 return 1;
1224 }
1225 if (*options == ',')
1226 options++;
1227 *data = (void *) options;
0b8e58a1 1228
ac27a0ec
DK		 1229 return sb_block;
1230}
1231
b3881f74 1232#define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
437ca0fd
DM		 1233static char deprecated_msg[] = "Mount option \"%s\" will be removed by %s\n"
1234 "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
b3881f74 1235
56c50f11
DM		 1236#ifdef CONFIG_QUOTA
1237static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
1238{
1239 struct ext4_sb_info *sbi = EXT4_SB(sb);
1240 char *qname;
03dafb5f 1241 int ret = -1;
56c50f11
DM		 1242
1243 if (sb_any_quota_loaded(sb) &&
1244 !sbi->s_qf_names[qtype]) {
1245 ext4_msg(sb, KERN_ERR,
1246 "Cannot change journaled "
1247 "quota options when quota turned on");
57f73c2c 1248 return -1;
56c50f11 1249 }
262b4662
JK		 1250 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA)) {
1251 ext4_msg(sb, KERN_ERR, "Cannot set journaled quota options "
1252 "when QUOTA feature is enabled");
1253 return -1;
1254 }
56c50f11
DM		 1255 qname = match_strdup(args);
1256 if (!qname) {
1257 ext4_msg(sb, KERN_ERR,
1258 "Not enough memory for storing quotafile name");
57f73c2c 1259 return -1;
56c50f11 1260 }
03dafb5f
CG		 1261 if (sbi->s_qf_names[qtype]) {
1262 if (strcmp(sbi->s_qf_names[qtype], qname) == 0)
1263 ret = 1;
1264 else
1265 ext4_msg(sb, KERN_ERR,
1266 "%s quota file already specified",
1267 QTYPE2NAME(qtype));
1268 goto errout;
56c50f11 1269 }
03dafb5f 1270 if (strchr(qname, '/')) {
56c50f11
DM		 1271 ext4_msg(sb, KERN_ERR,
1272 "quotafile must be on filesystem root");
03dafb5f 1273 goto errout;
56c50f11 1274 }
03dafb5f 1275 sbi->s_qf_names[qtype] = qname;
fd8c37ec 1276 set_opt(sb, QUOTA);
56c50f11 1277 return 1;
03dafb5f
CG		 1278errout:
1279 kfree(qname);
1280 return ret;
56c50f11
DM		 1281}
1282
1283static int clear_qf_name(struct super_block *sb, int qtype)
1284{
1285
1286 struct ext4_sb_info *sbi = EXT4_SB(sb);
1287
1288 if (sb_any_quota_loaded(sb) &&
1289 sbi->s_qf_names[qtype]) {
1290 ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options"
1291 " when quota turned on");
57f73c2c 1292 return -1;
56c50f11 1293 }
03dafb5f 1294 kfree(sbi->s_qf_names[qtype]);
56c50f11
DM		 1295 sbi->s_qf_names[qtype] = NULL;
1296 return 1;
1297}
1298#endif
1299
26092bf5
TT		 1300#define MOPT_SET 0x0001
1301#define MOPT_CLEAR 0x0002
1302#define MOPT_NOSUPPORT 0x0004
1303#define MOPT_EXPLICIT 0x0008
1304#define MOPT_CLEAR_ERR 0x0010
1305#define MOPT_GTE0 0x0020
ac27a0ec 1306#ifdef CONFIG_QUOTA
26092bf5
TT		 1307#define MOPT_Q 0
1308#define MOPT_QFMT 0x0040
1309#else
1310#define MOPT_Q MOPT_NOSUPPORT
1311#define MOPT_QFMT MOPT_NOSUPPORT
ac27a0ec 1312#endif
26092bf5 1313#define MOPT_DATAJ 0x0080
8dc0aa8c
TT		 1314#define MOPT_NO_EXT2 0x0100
1315#define MOPT_NO_EXT3 0x0200
1316#define MOPT_EXT4_ONLY (MOPT_NO_EXT2 | MOPT_NO_EXT3)
ad4eec61 1317#define MOPT_STRING 0x0400
26092bf5
TT		 1318
1319static const struct mount_opts {
1320 int token;
1321 int mount_opt;
1322 int flags;
1323} ext4_mount_opts[] = {
1324 {Opt_minix_df, EXT4_MOUNT_MINIX_DF, MOPT_SET},
1325 {Opt_bsd_df, EXT4_MOUNT_MINIX_DF, MOPT_CLEAR},
1326 {Opt_grpid, EXT4_MOUNT_GRPID, MOPT_SET},
1327 {Opt_nogrpid, EXT4_MOUNT_GRPID, MOPT_CLEAR},
26092bf5
TT		 1328 {Opt_block_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_SET},
1329 {Opt_noblock_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_CLEAR},
8dc0aa8c
TT		 1330 {Opt_dioread_nolock, EXT4_MOUNT_DIOREAD_NOLOCK,
1331 MOPT_EXT4_ONLY | MOPT_SET},
1332 {Opt_dioread_lock, EXT4_MOUNT_DIOREAD_NOLOCK,
1333 MOPT_EXT4_ONLY | MOPT_CLEAR},
26092bf5
TT		 1334 {Opt_discard, EXT4_MOUNT_DISCARD, MOPT_SET},
1335 {Opt_nodiscard, EXT4_MOUNT_DISCARD, MOPT_CLEAR},
8dc0aa8c
TT		 1336 {Opt_delalloc, EXT4_MOUNT_DELALLOC,
1337 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
1338 {Opt_nodelalloc, EXT4_MOUNT_DELALLOC,
59d9fa5c 1339 MOPT_EXT4_ONLY | MOPT_CLEAR},
c6d3d56d
DW		 1340 {Opt_nojournal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
1341 MOPT_EXT4_ONLY | MOPT_CLEAR},
8dc0aa8c
TT		 1342 {Opt_journal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
1343 MOPT_EXT4_ONLY | MOPT_SET},
26092bf5 1344 {Opt_journal_async_commit, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT |
8dc0aa8c
TT		 1345 EXT4_MOUNT_JOURNAL_CHECKSUM),
1346 MOPT_EXT4_ONLY | MOPT_SET},
1347 {Opt_noload, EXT4_MOUNT_NOLOAD, MOPT_NO_EXT2 | MOPT_SET},
26092bf5
TT		 1348 {Opt_err_panic, EXT4_MOUNT_ERRORS_PANIC, MOPT_SET | MOPT_CLEAR_ERR},
1349 {Opt_err_ro, EXT4_MOUNT_ERRORS_RO, MOPT_SET | MOPT_CLEAR_ERR},
1350 {Opt_err_cont, EXT4_MOUNT_ERRORS_CONT, MOPT_SET | MOPT_CLEAR_ERR},
8dc0aa8c
TT		 1351 {Opt_data_err_abort, EXT4_MOUNT_DATA_ERR_ABORT,
1352 MOPT_NO_EXT2 | MOPT_SET},
1353 {Opt_data_err_ignore, EXT4_MOUNT_DATA_ERR_ABORT,
1354 MOPT_NO_EXT2 | MOPT_CLEAR},
26092bf5
TT		 1355 {Opt_barrier, EXT4_MOUNT_BARRIER, MOPT_SET},
1356 {Opt_nobarrier, EXT4_MOUNT_BARRIER, MOPT_CLEAR},
1357 {Opt_noauto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_SET},
1358 {Opt_auto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_CLEAR},
1359 {Opt_noinit_itable, EXT4_MOUNT_INIT_INODE_TABLE, MOPT_CLEAR},
1360 {Opt_commit, 0, MOPT_GTE0},
1361 {Opt_max_batch_time, 0, MOPT_GTE0},
1362 {Opt_min_batch_time, 0, MOPT_GTE0},
1363 {Opt_inode_readahead_blks, 0, MOPT_GTE0},
1364 {Opt_init_itable, 0, MOPT_GTE0},
923ae0ff 1365 {Opt_dax, EXT4_MOUNT_DAX, MOPT_SET},
26092bf5 1366 {Opt_stripe, 0, MOPT_GTE0},
0efb3b23
JK		 1367 {Opt_resuid, 0, MOPT_GTE0},
1368 {Opt_resgid, 0, MOPT_GTE0},
1369 {Opt_journal_dev, 0, MOPT_GTE0},
ad4eec61 1370 {Opt_journal_path, 0, MOPT_STRING},
0efb3b23 1371 {Opt_journal_ioprio, 0, MOPT_GTE0},
8dc0aa8c
TT		 1372 {Opt_data_journal, EXT4_MOUNT_JOURNAL_DATA, MOPT_NO_EXT2 | MOPT_DATAJ},
1373 {Opt_data_ordered, EXT4_MOUNT_ORDERED_DATA, MOPT_NO_EXT2 | MOPT_DATAJ},
1374 {Opt_data_writeback, EXT4_MOUNT_WRITEBACK_DATA,
1375 MOPT_NO_EXT2 | MOPT_DATAJ},
26092bf5
TT		 1376 {Opt_user_xattr, EXT4_MOUNT_XATTR_USER, MOPT_SET},
1377 {Opt_nouser_xattr, EXT4_MOUNT_XATTR_USER, MOPT_CLEAR},
03010a33 1378#ifdef CONFIG_EXT4_FS_POSIX_ACL
26092bf5
TT		 1379 {Opt_acl, EXT4_MOUNT_POSIX_ACL, MOPT_SET},
1380 {Opt_noacl, EXT4_MOUNT_POSIX_ACL, MOPT_CLEAR},
ac27a0ec 1381#else
26092bf5
TT		 1382 {Opt_acl, 0, MOPT_NOSUPPORT},
1383 {Opt_noacl, 0, MOPT_NOSUPPORT},
ac27a0ec 1384#endif
26092bf5
TT		 1385 {Opt_nouid32, EXT4_MOUNT_NO_UID32, MOPT_SET},
1386 {Opt_debug, EXT4_MOUNT_DEBUG, MOPT_SET},
1387 {Opt_quota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA, MOPT_SET | MOPT_Q},
1388 {Opt_usrquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA,
1389 MOPT_SET | MOPT_Q},
1390 {Opt_grpquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_GRPQUOTA,
1391 MOPT_SET | MOPT_Q},
1392 {Opt_noquota, (EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA |
1393 EXT4_MOUNT_GRPQUOTA), MOPT_CLEAR | MOPT_Q},
1394 {Opt_usrjquota, 0, MOPT_Q},
1395 {Opt_grpjquota, 0, MOPT_Q},
1396 {Opt_offusrjquota, 0, MOPT_Q},
1397 {Opt_offgrpjquota, 0, MOPT_Q},
1398 {Opt_jqfmt_vfsold, QFMT_VFS_OLD, MOPT_QFMT},
1399 {Opt_jqfmt_vfsv0, QFMT_VFS_V0, MOPT_QFMT},
1400 {Opt_jqfmt_vfsv1, QFMT_VFS_V1, MOPT_QFMT},
df981d03 1401 {Opt_max_dir_size_kb, 0, MOPT_GTE0},
6ddb2447 1402 {Opt_test_dummy_encryption, 0, MOPT_GTE0},
26092bf5
TT		 1403 {Opt_err, 0, 0}
1404};
1405
1406static int handle_mount_opt(struct super_block *sb, char *opt, int token,
1407 substring_t *args, unsigned long *journal_devnum,
1408 unsigned int *journal_ioprio, int is_remount)
1409{
1410 struct ext4_sb_info *sbi = EXT4_SB(sb);
1411 const struct mount_opts *m;
08cefc7a
EB		 1412 kuid_t uid;
1413 kgid_t gid;
26092bf5
TT		 1414 int arg = 0;
1415
57f73c2c
TT		 1416#ifdef CONFIG_QUOTA
1417 if (token == Opt_usrjquota)
1418 return set_qf_name(sb, USRQUOTA, &args[0]);
1419 else if (token == Opt_grpjquota)
1420 return set_qf_name(sb, GRPQUOTA, &args[0]);
1421 else if (token == Opt_offusrjquota)
1422 return clear_qf_name(sb, USRQUOTA);
1423 else if (token == Opt_offgrpjquota)
1424 return clear_qf_name(sb, GRPQUOTA);
1425#endif
26092bf5 1426 switch (token) {
f7048605
TT		 1427 case Opt_noacl:
1428 case Opt_nouser_xattr:
1429 ext4_msg(sb, KERN_WARNING, deprecated_msg, opt, "3.5");
1430 break;
26092bf5
TT		 1431 case Opt_sb:
1432 return 1; /* handled by get_sb_block() */
1433 case Opt_removed:
5f3633e3 1434 ext4_msg(sb, KERN_WARNING, "Ignoring removed %s option", opt);
26092bf5 1435 return 1;
26092bf5
TT		 1436 case Opt_abort:
1437 sbi->s_mount_flags |= EXT4_MF_FS_ABORTED;
1438 return 1;
1439 case Opt_i_version:
1440 sb->s_flags |= MS_I_VERSION;
1441 return 1;
a26f4992
TT		 1442 case Opt_lazytime:
1443 sb->s_flags |= MS_LAZYTIME;
1444 return 1;
1445 case Opt_nolazytime:
1446 sb->s_flags &= ~MS_LAZYTIME;
1447 return 1;
26092bf5
TT		 1448 }
1449
5f3633e3
JK		 1450 for (m = ext4_mount_opts; m->token != Opt_err; m++)
1451 if (token == m->token)
1452 break;
1453
1454 if (m->token == Opt_err) {
1455 ext4_msg(sb, KERN_ERR, "Unrecognized mount option \"%s\" "
1456 "or missing value", opt);
1457 return -1;
1458 }
1459
8dc0aa8c
TT		 1460 if ((m->flags & MOPT_NO_EXT2) && IS_EXT2_SB(sb)) {
1461 ext4_msg(sb, KERN_ERR,
1462 "Mount option \"%s\" incompatible with ext2", opt);
1463 return -1;
1464 }
1465 if ((m->flags & MOPT_NO_EXT3) && IS_EXT3_SB(sb)) {
1466 ext4_msg(sb, KERN_ERR,
1467 "Mount option \"%s\" incompatible with ext3", opt);
1468 return -1;
1469 }
1470
ad4eec61 1471 if (args->from && !(m->flags & MOPT_STRING) && match_int(args, &arg))
5f3633e3
JK		 1472 return -1;
1473 if (args->from && (m->flags & MOPT_GTE0) && (arg < 0))
1474 return -1;
1475 if (m->flags & MOPT_EXPLICIT)
1476 set_opt2(sb, EXPLICIT_DELALLOC);
1477 if (m->flags & MOPT_CLEAR_ERR)
1478 clear_opt(sb, ERRORS_MASK);
1479 if (token == Opt_noquota && sb_any_quota_loaded(sb)) {
1480 ext4_msg(sb, KERN_ERR, "Cannot change quota "
1481 "options when quota turned on");
1482 return -1;
1483 }
1484
1485 if (m->flags & MOPT_NOSUPPORT) {
1486 ext4_msg(sb, KERN_ERR, "%s option not supported", opt);
1487 } else if (token == Opt_commit) {
1488 if (arg == 0)
1489 arg = JBD2_DEFAULT_MAX_COMMIT_AGE;
1490 sbi->s_commit_interval = HZ * arg;
1491 } else if (token == Opt_max_batch_time) {
5f3633e3
JK		 1492 sbi->s_max_batch_time = arg;
1493 } else if (token == Opt_min_batch_time) {
1494 sbi->s_min_batch_time = arg;
1495 } else if (token == Opt_inode_readahead_blks) {
e33e60ea
JK		 1496 if (arg && (arg > (1 << 30) || !is_power_of_2(arg))) {
1497 ext4_msg(sb, KERN_ERR,
1498 "EXT4-fs: inode_readahead_blks must be "
1499 "0 or a power of 2 smaller than 2^31");
26092bf5 1500 return -1;
5f3633e3
JK		 1501 }
1502 sbi->s_inode_readahead_blks = arg;
1503 } else if (token == Opt_init_itable) {
1504 set_opt(sb, INIT_INODE_TABLE);
1505 if (!args->from)
1506 arg = EXT4_DEF_LI_WAIT_MULT;
1507 sbi->s_li_wait_mult = arg;
1508 } else if (token == Opt_max_dir_size_kb) {
1509 sbi->s_max_dir_size_kb = arg;
1510 } else if (token == Opt_stripe) {
1511 sbi->s_stripe = arg;
1512 } else if (token == Opt_resuid) {
1513 uid = make_kuid(current_user_ns(), arg);
1514 if (!uid_valid(uid)) {
1515 ext4_msg(sb, KERN_ERR, "Invalid uid value %d", arg);
26092bf5
TT		 1516 return -1;
1517 }
5f3633e3
JK		 1518 sbi->s_resuid = uid;
1519 } else if (token == Opt_resgid) {
1520 gid = make_kgid(current_user_ns(), arg);
1521 if (!gid_valid(gid)) {
1522 ext4_msg(sb, KERN_ERR, "Invalid gid value %d", arg);
1523 return -1;
1524 }
1525 sbi->s_resgid = gid;
1526 } else if (token == Opt_journal_dev) {
1527 if (is_remount) {
1528 ext4_msg(sb, KERN_ERR,
1529 "Cannot specify journal on remount");
1530 return -1;
1531 }
1532 *journal_devnum = arg;
ad4eec61
ES		 1533 } else if (token == Opt_journal_path) {
1534 char *journal_path;
1535 struct inode *journal_inode;
1536 struct path path;
1537 int error;
1538
1539 if (is_remount) {
1540 ext4_msg(sb, KERN_ERR,
1541 "Cannot specify journal on remount");
1542 return -1;
1543 }
1544 journal_path = match_strdup(&args[0]);
1545 if (!journal_path) {
1546 ext4_msg(sb, KERN_ERR, "error: could not dup "
1547 "journal device string");
1548 return -1;
1549 }
1550
1551 error = kern_path(journal_path, LOOKUP_FOLLOW, &path);
1552 if (error) {
1553 ext4_msg(sb, KERN_ERR, "error: could not find "
1554 "journal device path: error %d", error);
1555 kfree(journal_path);
1556 return -1;
1557 }
1558
2b0143b5 1559 journal_inode = d_inode(path.dentry);
ad4eec61
ES		 1560 if (!S_ISBLK(journal_inode->i_mode)) {
1561 ext4_msg(sb, KERN_ERR, "error: journal path %s "
1562 "is not a block device", journal_path);
1563 path_put(&path);
1564 kfree(journal_path);
1565 return -1;
1566 }
1567
1568 *journal_devnum = new_encode_dev(journal_inode->i_rdev);
1569 path_put(&path);
1570 kfree(journal_path);
5f3633e3
JK		 1571 } else if (token == Opt_journal_ioprio) {
1572 if (arg > 7) {
1573 ext4_msg(sb, KERN_ERR, "Invalid journal IO priority"
1574 " (must be 0-7)");
1575 return -1;
1576 }
1577 *journal_ioprio =
1578 IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, arg);
6ddb2447
TT		 1579 } else if (token == Opt_test_dummy_encryption) {
1580#ifdef CONFIG_EXT4_FS_ENCRYPTION
1581 sbi->s_mount_flags |= EXT4_MF_TEST_DUMMY_ENCRYPTION;
1582 ext4_msg(sb, KERN_WARNING,
1583 "Test dummy encryption mode enabled");
1584#else
1585 ext4_msg(sb, KERN_WARNING,
1586 "Test dummy encryption mount option ignored");
1587#endif
5f3633e3
JK		 1588 } else if (m->flags & MOPT_DATAJ) {
1589 if (is_remount) {
1590 if (!sbi->s_journal)
1591 ext4_msg(sb, KERN_WARNING, "Remounting file system with no journal so ignoring journalled data option");
1592 else if (test_opt(sb, DATA_FLAGS) != m->mount_opt) {
0efb3b23 1593 ext4_msg(sb, KERN_ERR,
26092bf5 1594 "Cannot change data mode on remount");
26092bf5 1595 return -1;
ac27a0ec 1596 }
26092bf5 1597 } else {
5f3633e3
JK		 1598 clear_opt(sb, DATA_FLAGS);
1599 sbi->s_mount_opt |= m->mount_opt;
ac27a0ec 1600 }
5f3633e3
JK		 1601#ifdef CONFIG_QUOTA
1602 } else if (m->flags & MOPT_QFMT) {
1603 if (sb_any_quota_loaded(sb) &&
1604 sbi->s_jquota_fmt != m->mount_opt) {
1605 ext4_msg(sb, KERN_ERR, "Cannot change journaled "
1606 "quota options when quota turned on");
1607 return -1;
1608 }
262b4662
JK		 1609 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
1610 EXT4_FEATURE_RO_COMPAT_QUOTA)) {
1611 ext4_msg(sb, KERN_ERR,
1612 "Cannot set journaled quota options "
1613 "when QUOTA feature is enabled");
1614 return -1;
1615 }
5f3633e3 1616 sbi->s_jquota_fmt = m->mount_opt;
923ae0ff
RZ		 1617#endif
1618#ifndef CONFIG_FS_DAX
1619 } else if (token == Opt_dax) {
1620 ext4_msg(sb, KERN_INFO, "dax option not supported");
1621 return -1;
5f3633e3
JK		 1622#endif
1623 } else {
1624 if (!args->from)
1625 arg = 1;
1626 if (m->flags & MOPT_CLEAR)
1627 arg = !arg;
1628 else if (unlikely(!(m->flags & MOPT_SET))) {
1629 ext4_msg(sb, KERN_WARNING,
1630 "buggy handling of option %s", opt);
1631 WARN_ON(1);
1632 return -1;
1633 }
1634 if (arg != 0)
1635 sbi->s_mount_opt |= m->mount_opt;
1636 else
1637 sbi->s_mount_opt &= ~m->mount_opt;
26092bf5 1638 }
5f3633e3 1639 return 1;
26092bf5
TT		 1640}
1641
1642static int parse_options(char *options, struct super_block *sb,
1643 unsigned long *journal_devnum,
1644 unsigned int *journal_ioprio,
1645 int is_remount)
1646{
1647 struct ext4_sb_info *sbi = EXT4_SB(sb);
1648 char *p;
1649 substring_t args[MAX_OPT_ARGS];
1650 int token;
1651
1652 if (!options)
1653 return 1;
1654
1655 while ((p = strsep(&options, ",")) != NULL) {
1656 if (!*p)
1657 continue;
1658 /*
1659 * Initialize args struct so we know whether arg was
1660 * found; some options take optional arguments.
1661 */
caecd0af 1662 args[0].to = args[0].from = NULL;
26092bf5
TT		 1663 token = match_token(p, tokens, args);
1664 if (handle_mount_opt(sb, p, token, args, journal_devnum,
1665 journal_ioprio, is_remount) < 0)
1666 return 0;
ac27a0ec
DK		 1667 }
1668#ifdef CONFIG_QUOTA
262b4662
JK		 1669 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) &&
1670 (test_opt(sb, USRQUOTA) || test_opt(sb, GRPQUOTA))) {
1671 ext4_msg(sb, KERN_ERR, "Cannot set quota options when QUOTA "
1672 "feature is enabled");
1673 return 0;
1674 }
ac27a0ec 1675 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
482a7425 1676 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
fd8c37ec 1677 clear_opt(sb, USRQUOTA);
ac27a0ec 1678
482a7425 1679 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
fd8c37ec 1680 clear_opt(sb, GRPQUOTA);
ac27a0ec 1681
56c50f11 1682 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
b31e1552
ES		 1683 ext4_msg(sb, KERN_ERR, "old and new quota "
1684 "format mixing");
ac27a0ec
DK		 1685 return 0;
1686 }
1687
1688 if (!sbi->s_jquota_fmt) {
b31e1552
ES		 1689 ext4_msg(sb, KERN_ERR, "journaled quota format "
1690 "not specified");
ac27a0ec
DK		 1691 return 0;
1692 }
ac27a0ec
DK		 1693 }
1694#endif
261cb20c
JK		 1695 if (test_opt(sb, DIOREAD_NOLOCK)) {
1696 int blocksize =
1697 BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);
1698
1699 if (blocksize < PAGE_CACHE_SIZE) {
1700 ext4_msg(sb, KERN_ERR, "can't mount with "
1701 "dioread_nolock if block size != PAGE_SIZE");
1702 return 0;
1703 }
1704 }
d4f76107
JK		 1705 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA &&
1706 test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
1707 ext4_msg(sb, KERN_ERR, "can't mount with journal_async_commit "
1708 "in data=ordered mode");
1709 return 0;
1710 }
ac27a0ec
DK		 1711 return 1;
1712}
1713
2adf6da8
TT		 1714static inline void ext4_show_quota_options(struct seq_file *seq,
1715 struct super_block *sb)
1716{
1717#if defined(CONFIG_QUOTA)
1718 struct ext4_sb_info *sbi = EXT4_SB(sb);
1719
1720 if (sbi->s_jquota_fmt) {
1721 char *fmtname = "";
1722
1723 switch (sbi->s_jquota_fmt) {
1724 case QFMT_VFS_OLD:
1725 fmtname = "vfsold";
1726 break;
1727 case QFMT_VFS_V0:
1728 fmtname = "vfsv0";
1729 break;
1730 case QFMT_VFS_V1:
1731 fmtname = "vfsv1";
1732 break;
1733 }
1734 seq_printf(seq, ",jqfmt=%s", fmtname);
1735 }
1736
1737 if (sbi->s_qf_names[USRQUOTA])
1738 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
1739
1740 if (sbi->s_qf_names[GRPQUOTA])
1741 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
2adf6da8
TT		 1742#endif
1743}
1744
5a916be1
TT		 1745static const char *token2str(int token)
1746{
50df9fd5 1747 const struct match_token *t;
5a916be1
TT		 1748
1749 for (t = tokens; t->token != Opt_err; t++)
1750 if (t->token == token && !strchr(t->pattern, '='))
1751 break;
1752 return t->pattern;
1753}
1754
2adf6da8
TT		 1755/*
1756 * Show an option if
1757 * - it's set to a non-default value OR
1758 * - if the per-sb default is different from the global default
1759 */
66acdcf4
TT		 1760static int _ext4_show_options(struct seq_file *seq, struct super_block *sb,
1761 int nodefs)
2adf6da8 1762{
2adf6da8
TT		 1763 struct ext4_sb_info *sbi = EXT4_SB(sb);
1764 struct ext4_super_block *es = sbi->s_es;
66acdcf4 1765 int def_errors, def_mount_opt = nodefs ? 0 : sbi->s_def_mount_opt;
5a916be1 1766 const struct mount_opts *m;
66acdcf4 1767 char sep = nodefs ? '\n' : ',';
2adf6da8 1768
66acdcf4
TT		 1769#define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep)
1770#define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg)
2adf6da8
TT		 1771
1772 if (sbi->s_sb_block != 1)
5a916be1
TT		 1773 SEQ_OPTS_PRINT("sb=%llu", sbi->s_sb_block);
1774
1775 for (m = ext4_mount_opts; m->token != Opt_err; m++) {
1776 int want_set = m->flags & MOPT_SET;
1777 if (((m->flags & (MOPT_SET|MOPT_CLEAR)) == 0) ||
1778 (m->flags & MOPT_CLEAR_ERR))
1779 continue;
66acdcf4 1780 if (!(m->mount_opt & (sbi->s_mount_opt ^ def_mount_opt)))
5a916be1
TT		 1781 continue; /* skip if same as the default */
1782 if ((want_set &&
1783 (sbi->s_mount_opt & m->mount_opt) != m->mount_opt) ||
1784 (!want_set && (sbi->s_mount_opt & m->mount_opt)))
1785 continue; /* select Opt_noFoo vs Opt_Foo */
1786 SEQ_OPTS_PRINT("%s", token2str(m->token));
2adf6da8 1787 }
5a916be1 1788
08cefc7a 1789 if (nodefs || !uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT4_DEF_RESUID)) ||
5a916be1 1790 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID)
08cefc7a
EB		 1791 SEQ_OPTS_PRINT("resuid=%u",
1792 from_kuid_munged(&init_user_ns, sbi->s_resuid));
1793 if (nodefs || !gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT4_DEF_RESGID)) ||
5a916be1 1794 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID)
08cefc7a
EB		 1795 SEQ_OPTS_PRINT("resgid=%u",
1796 from_kgid_munged(&init_user_ns, sbi->s_resgid));
66acdcf4 1797 def_errors = nodefs ? -1 : le16_to_cpu(es->s_errors);
5a916be1
TT		 1798 if (test_opt(sb, ERRORS_RO) && def_errors != EXT4_ERRORS_RO)
1799 SEQ_OPTS_PUTS("errors=remount-ro");
2adf6da8 1800 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
5a916be1 1801 SEQ_OPTS_PUTS("errors=continue");
2adf6da8 1802 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
5a916be1 1803 SEQ_OPTS_PUTS("errors=panic");
66acdcf4 1804 if (nodefs || sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ)
5a916be1 1805 SEQ_OPTS_PRINT("commit=%lu", sbi->s_commit_interval / HZ);
66acdcf4 1806 if (nodefs || sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME)
5a916be1 1807 SEQ_OPTS_PRINT("min_batch_time=%u", sbi->s_min_batch_time);
66acdcf4 1808 if (nodefs || sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME)
5a916be1 1809 SEQ_OPTS_PRINT("max_batch_time=%u", sbi->s_max_batch_time);
2adf6da8 1810 if (sb->s_flags & MS_I_VERSION)
5a916be1 1811 SEQ_OPTS_PUTS("i_version");
66acdcf4 1812 if (nodefs || sbi->s_stripe)
5a916be1 1813 SEQ_OPTS_PRINT("stripe=%lu", sbi->s_stripe);
66acdcf4 1814 if (EXT4_MOUNT_DATA_FLAGS & (sbi->s_mount_opt ^ def_mount_opt)) {
5a916be1
TT		 1815 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
1816 SEQ_OPTS_PUTS("data=journal");
1817 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
1818 SEQ_OPTS_PUTS("data=ordered");
1819 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
1820 SEQ_OPTS_PUTS("data=writeback");
1821 }
66acdcf4
TT		 1822 if (nodefs ||
1823 sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
5a916be1
TT		 1824 SEQ_OPTS_PRINT("inode_readahead_blks=%u",
1825 sbi->s_inode_readahead_blks);
2adf6da8 1826
66acdcf4
TT		 1827 if (nodefs || (test_opt(sb, INIT_INODE_TABLE) &&
1828 (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT)))
5a916be1 1829 SEQ_OPTS_PRINT("init_itable=%u", sbi->s_li_wait_mult);
df981d03
TT		 1830 if (nodefs || sbi->s_max_dir_size_kb)
1831 SEQ_OPTS_PRINT("max_dir_size_kb=%u", sbi->s_max_dir_size_kb);
2adf6da8
TT		 1832
1833 ext4_show_quota_options(seq, sb);
2adf6da8
TT		 1834 return 0;
1835}
1836
66acdcf4
TT		 1837static int ext4_show_options(struct seq_file *seq, struct dentry *root)
1838{
1839 return _ext4_show_options(seq, root->d_sb, 0);
1840}
1841
1842static int options_seq_show(struct seq_file *seq, void *offset)
1843{
1844 struct super_block *sb = seq->private;
1845 int rc;
1846
1847 seq_puts(seq, (sb->s_flags & MS_RDONLY) ? "ro" : "rw");
1848 rc = _ext4_show_options(seq, sb, 1);
1849 seq_puts(seq, "\n");
1850 return rc;
1851}
1852
1853static int options_open_fs(struct inode *inode, struct file *file)
1854{
d9dda78b 1855 return single_open(file, options_seq_show, PDE_DATA(inode));
66acdcf4
TT		 1856}
1857
1858static const struct file_operations ext4_seq_options_fops = {
1859 .owner = THIS_MODULE,
1860 .open = options_open_fs,
1861 .read = seq_read,
1862 .llseek = seq_lseek,
1863 .release = single_release,
1864};
1865
617ba13b 1866static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
ac27a0ec
DK		 1867 int read_only)
1868{
617ba13b 1869 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec
DK		 1870 int res = 0;
1871
617ba13b 1872 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
b31e1552
ES		 1873 ext4_msg(sb, KERN_ERR, "revision level too high, "
1874 "forcing read-only mode");
ac27a0ec
DK		 1875 res = MS_RDONLY;
1876 }
1877 if (read_only)
281b5995 1878 goto done;
617ba13b 1879 if (!(sbi->s_mount_state & EXT4_VALID_FS))
b31e1552
ES		 1880 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
1881 "running e2fsck is recommended");
c8b459f4 1882 else if (sbi->s_mount_state & EXT4_ERROR_FS)
b31e1552
ES		 1883 ext4_msg(sb, KERN_WARNING,
1884 "warning: mounting fs with errors, "
1885 "running e2fsck is recommended");
ed3ce80a 1886 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
ac27a0ec
DK		 1887 le16_to_cpu(es->s_mnt_count) >=
1888 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
b31e1552
ES		 1889 ext4_msg(sb, KERN_WARNING,
1890 "warning: maximal mount count reached, "
1891 "running e2fsck is recommended");
ac27a0ec
DK		 1892 else if (le32_to_cpu(es->s_checkinterval) &&
1893 (le32_to_cpu(es->s_lastcheck) +
1894 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
b31e1552
ES		 1895 ext4_msg(sb, KERN_WARNING,
1896 "warning: checktime reached, "
1897 "running e2fsck is recommended");
0b8e58a1 1898 if (!sbi->s_journal)
0390131b 1899 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
ac27a0ec 1900 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
617ba13b 1901 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
e8546d06 1902 le16_add_cpu(&es->s_mnt_count, 1);
ac27a0ec 1903 es->s_mtime = cpu_to_le32(get_seconds());
617ba13b 1904 ext4_update_dynamic_rev(sb);
0390131b
FM		 1905 if (sbi->s_journal)
1906 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
ac27a0ec 1907
e2d67052 1908 ext4_commit_super(sb, 1);
281b5995 1909done:
ac27a0ec 1910 if (test_opt(sb, DEBUG))
a9df9a49 1911 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
a2595b8a 1912 "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
ac27a0ec
DK		 1913 sb->s_blocksize,
1914 sbi->s_groups_count,
617ba13b
MC		 1915 EXT4_BLOCKS_PER_GROUP(sb),
1916 EXT4_INODES_PER_GROUP(sb),
a2595b8a 1917 sbi->s_mount_opt, sbi->s_mount_opt2);
ac27a0ec 1918
7abc52c2 1919 cleancache_init_fs(sb);
ac27a0ec
DK		 1920 return res;
1921}
1922
117fff10
TT		 1923int ext4_alloc_flex_bg_array(struct super_block *sb, ext4_group_t ngroup)
1924{
1925 struct ext4_sb_info *sbi = EXT4_SB(sb);
1926 struct flex_groups *new_groups;
1927 int size;
1928
1929 if (!sbi->s_log_groups_per_flex)
1930 return 0;
1931
1932 size = ext4_flex_group(sbi, ngroup - 1) + 1;
1933 if (size <= sbi->s_flex_groups_allocated)
1934 return 0;
1935
1936 size = roundup_pow_of_two(size * sizeof(struct flex_groups));
1937 new_groups = ext4_kvzalloc(size, GFP_KERNEL);
1938 if (!new_groups) {
1939 ext4_msg(sb, KERN_ERR, "not enough memory for %d flex groups",
1940 size / (int) sizeof(struct flex_groups));
1941 return -ENOMEM;
1942 }
1943
1944 if (sbi->s_flex_groups) {
1945 memcpy(new_groups, sbi->s_flex_groups,
1946 (sbi->s_flex_groups_allocated *
1947 sizeof(struct flex_groups)));
b93b41d4 1948 kvfree(sbi->s_flex_groups);
117fff10
TT		 1949 }
1950 sbi->s_flex_groups = new_groups;
1951 sbi->s_flex_groups_allocated = size / sizeof(struct flex_groups);
1952 return 0;
1953}
1954
772cb7c8
JS		 1955static int ext4_fill_flex_info(struct super_block *sb)
1956{
1957 struct ext4_sb_info *sbi = EXT4_SB(sb);
1958 struct ext4_group_desc *gdp = NULL;
772cb7c8 1959 ext4_group_t flex_group;
117fff10 1960 int i, err;
772cb7c8 1961
503358ae 1962 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
d50f2ab6 1963 if (sbi->s_log_groups_per_flex < 1 || sbi->s_log_groups_per_flex > 31) {
772cb7c8
JS		 1964 sbi->s_log_groups_per_flex = 0;
1965 return 1;
1966 }
1967
117fff10
TT		 1968 err = ext4_alloc_flex_bg_array(sb, sbi->s_groups_count);
1969 if (err)
9933fc0a 1970 goto failed;
772cb7c8 1971
772cb7c8 1972 for (i = 0; i < sbi->s_groups_count; i++) {
88b6edd1 1973 gdp = ext4_get_group_desc(sb, i, NULL);
772cb7c8
JS		 1974
1975 flex_group = ext4_flex_group(sbi, i);
7ad9bb65
TT		 1976 atomic_add(ext4_free_inodes_count(sb, gdp),
1977 &sbi->s_flex_groups[flex_group].free_inodes);
90ba983f
TT		 1978 atomic64_add(ext4_free_group_clusters(sb, gdp),
1979 &sbi->s_flex_groups[flex_group].free_clusters);
7ad9bb65
TT		 1980 atomic_add(ext4_used_dirs_count(sb, gdp),
1981 &sbi->s_flex_groups[flex_group].used_dirs);
772cb7c8
JS		 1982 }
1983
1984 return 1;
1985failed:
1986 return 0;
1987}
1988
feb0ab32
DW		 1989static __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
1990 struct ext4_group_desc *gdp)
717d50e4 1991{
feb0ab32 1992 int offset;
717d50e4 1993 __u16 crc = 0;
feb0ab32 1994 __le32 le_group = cpu_to_le32(block_group);
717d50e4 1995
9aa5d32b 1996 if (ext4_has_metadata_csum(sbi->s_sb)) {
feb0ab32 1997 /* Use new metadata_csum algorithm */
d6a77105 1998 __le16 save_csum;
feb0ab32
DW		 1999 __u32 csum32;
2000
d6a77105 2001 save_csum = gdp->bg_checksum;
feb0ab32
DW		 2002 gdp->bg_checksum = 0;
2003 csum32 = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&le_group,
2004 sizeof(le_group));
2005 csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp,
2006 sbi->s_desc_size);
d6a77105 2007 gdp->bg_checksum = save_csum;
feb0ab32
DW		 2008
2009 crc = csum32 & 0xFFFF;
2010 goto out;
717d50e4
AD		 2011 }
2012
feb0ab32 2013 /* old crc16 code */
813d32f9
DW		 2014 if (!(sbi->s_es->s_feature_ro_compat &
2015 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM)))
2016 return 0;
2017
feb0ab32
DW		 2018 offset = offsetof(struct ext4_group_desc, bg_checksum);
2019
2020 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
2021 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
2022 crc = crc16(crc, (__u8 *)gdp, offset);
2023 offset += sizeof(gdp->bg_checksum); /* skip checksum */
2024 /* for checksum of struct ext4_group_desc do the rest...*/
2025 if ((sbi->s_es->s_feature_incompat &
2026 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) &&
2027 offset < le16_to_cpu(sbi->s_es->s_desc_size))
2028 crc = crc16(crc, (__u8 *)gdp + offset,
2029 le16_to_cpu(sbi->s_es->s_desc_size) -
2030 offset);
2031
2032out:
717d50e4
AD		 2033 return cpu_to_le16(crc);
2034}
2035
feb0ab32 2036int ext4_group_desc_csum_verify(struct super_block *sb, __u32 block_group,
717d50e4
AD		 2037 struct ext4_group_desc *gdp)
2038{
feb0ab32
DW		 2039 if (ext4_has_group_desc_csum(sb) &&
2040 (gdp->bg_checksum != ext4_group_desc_csum(EXT4_SB(sb),
2041 block_group, gdp)))
717d50e4
AD		 2042 return 0;
2043
2044 return 1;
2045}
2046
feb0ab32
DW		 2047void ext4_group_desc_csum_set(struct super_block *sb, __u32 block_group,
2048 struct ext4_group_desc *gdp)
2049{
2050 if (!ext4_has_group_desc_csum(sb))
2051 return;
2052 gdp->bg_checksum = ext4_group_desc_csum(EXT4_SB(sb), block_group, gdp);
2053}
2054
ac27a0ec 2055/* Called at mount-time, super-block is locked */
bfff6873
LC		 2056static int ext4_check_descriptors(struct super_block *sb,
2057 ext4_group_t *first_not_zeroed)
ac27a0ec 2058{
617ba13b
MC		 2059 struct ext4_sb_info *sbi = EXT4_SB(sb);
2060 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
2061 ext4_fsblk_t last_block;
bd81d8ee
LV		 2062 ext4_fsblk_t block_bitmap;
2063 ext4_fsblk_t inode_bitmap;
2064 ext4_fsblk_t inode_table;
ce421581 2065 int flexbg_flag = 0;
bfff6873 2066 ext4_group_t i, grp = sbi->s_groups_count;
ac27a0ec 2067
ce421581
JS		 2068 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
2069 flexbg_flag = 1;
2070
af5bc92d 2071 ext4_debug("Checking group descriptors");
ac27a0ec 2072
197cd65a
AM		 2073 for (i = 0; i < sbi->s_groups_count; i++) {
2074 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
2075
ce421581 2076 if (i == sbi->s_groups_count - 1 || flexbg_flag)
bd81d8ee 2077 last_block = ext4_blocks_count(sbi->s_es) - 1;
ac27a0ec
DK		 2078 else
2079 last_block = first_block +
617ba13b 2080 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
ac27a0ec 2081
bfff6873
LC		 2082 if ((grp == sbi->s_groups_count) &&
2083 !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2084 grp = i;
2085
8fadc143 2086 block_bitmap = ext4_block_bitmap(sb, gdp);
2b2d6d01 2087 if (block_bitmap < first_block || block_bitmap > last_block) {
b31e1552 2088 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2089 "Block bitmap for group %u not in group "
b31e1552 2090 "(block %llu)!", i, block_bitmap);
ac27a0ec
DK		 2091 return 0;
2092 }
8fadc143 2093 inode_bitmap = ext4_inode_bitmap(sb, gdp);
2b2d6d01 2094 if (inode_bitmap < first_block || inode_bitmap > last_block) {
b31e1552 2095 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2096 "Inode bitmap for group %u not in group "
b31e1552 2097 "(block %llu)!", i, inode_bitmap);
ac27a0ec
DK		 2098 return 0;
2099 }
8fadc143 2100 inode_table = ext4_inode_table(sb, gdp);
bd81d8ee 2101 if (inode_table < first_block ||
2b2d6d01 2102 inode_table + sbi->s_itb_per_group - 1 > last_block) {
b31e1552 2103 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2104 "Inode table for group %u not in group "
b31e1552 2105 "(block %llu)!", i, inode_table);
ac27a0ec
DK		 2106 return 0;
2107 }
955ce5f5 2108 ext4_lock_group(sb, i);
feb0ab32 2109 if (!ext4_group_desc_csum_verify(sb, i, gdp)) {
b31e1552
ES		 2110 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2111 "Checksum for group %u failed (%u!=%u)",
2112 i, le16_to_cpu(ext4_group_desc_csum(sbi, i,
2113 gdp)), le16_to_cpu(gdp->bg_checksum));
7ee1ec4c 2114 if (!(sb->s_flags & MS_RDONLY)) {
955ce5f5 2115 ext4_unlock_group(sb, i);
8a266467 2116 return 0;
7ee1ec4c 2117 }
717d50e4 2118 }
955ce5f5 2119 ext4_unlock_group(sb, i);
ce421581
JS		 2120 if (!flexbg_flag)
2121 first_block += EXT4_BLOCKS_PER_GROUP(sb);
ac27a0ec 2122 }
bfff6873
LC		 2123 if (NULL != first_not_zeroed)
2124 *first_not_zeroed = grp;
ac27a0ec
DK		 2125 return 1;
2126}
2127
617ba13b 2128/* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
ac27a0ec
DK		 2129 * the superblock) which were deleted from all directories, but held open by
2130 * a process at the time of a crash. We walk the list and try to delete these
2131 * inodes at recovery time (only with a read-write filesystem).
2132 *
2133 * In order to keep the orphan inode chain consistent during traversal (in
2134 * case of crash during recovery), we link each inode into the superblock
2135 * orphan list_head and handle it the same way as an inode deletion during
2136 * normal operation (which journals the operations for us).
2137 *
2138 * We only do an iget() and an iput() on each inode, which is very safe if we
2139 * accidentally point at an in-use or already deleted inode. The worst that
2140 * can happen in this case is that we get a "bit already cleared" message from
617ba13b 2141 * ext4_free_inode(). The only reason we would point at a wrong inode is if
ac27a0ec
DK		 2142 * e2fsck was run on this filesystem, and it must have already done the orphan
2143 * inode cleanup for us, so we can safely abort without any further action.
2144 */
2b2d6d01
TT		 2145static void ext4_orphan_cleanup(struct super_block *sb,
2146 struct ext4_super_block *es)
ac27a0ec
DK		 2147{
2148 unsigned int s_flags = sb->s_flags;
2149 int nr_orphans = 0, nr_truncates = 0;
2150#ifdef CONFIG_QUOTA
2151 int i;
2152#endif
2153 if (!es->s_last_orphan) {
2154 jbd_debug(4, "no orphan inodes to clean up\n");
2155 return;
2156 }
2157
a8f48a95 2158 if (bdev_read_only(sb->s_bdev)) {
b31e1552
ES		 2159 ext4_msg(sb, KERN_ERR, "write access "
2160 "unavailable, skipping orphan cleanup");
a8f48a95
ES		 2161 return;
2162 }
2163
d39195c3
AG		 2164 /* Check if feature set would not allow a r/w mount */
2165 if (!ext4_feature_set_ok(sb, 0)) {
2166 ext4_msg(sb, KERN_INFO, "Skipping orphan cleanup due to "
2167 "unknown ROCOMPAT features");
2168 return;
2169 }
2170
617ba13b 2171 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
c25f9bc6
ES		 2172 /* don't clear list on RO mount w/ errors */
2173 if (es->s_last_orphan && !(s_flags & MS_RDONLY)) {
84474976 2174 ext4_msg(sb, KERN_INFO, "Errors on filesystem, "
ac27a0ec 2175 "clearing orphan list.\n");
c25f9bc6
ES		 2176 es->s_last_orphan = 0;
2177 }
ac27a0ec
DK		 2178 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2179 return;
2180 }
2181
2182 if (s_flags & MS_RDONLY) {
b31e1552 2183 ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
ac27a0ec
DK		 2184 sb->s_flags &= ~MS_RDONLY;
2185 }
2186#ifdef CONFIG_QUOTA
2187 /* Needed for iput() to work correctly and not trash data */
2188 sb->s_flags |= MS_ACTIVE;
2189 /* Turn on quotas so that they are updated correctly */
a2d4a646 2190 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
617ba13b
MC		 2191 if (EXT4_SB(sb)->s_qf_names[i]) {
2192 int ret = ext4_quota_on_mount(sb, i);
ac27a0ec 2193 if (ret < 0)
b31e1552
ES		 2194 ext4_msg(sb, KERN_ERR,
2195 "Cannot turn on journaled "
2196 "quota: error %d", ret);
ac27a0ec
DK		 2197 }
2198 }
2199#endif
2200
2201 while (es->s_last_orphan) {
2202 struct inode *inode;
2203
97bd42b9
JB		 2204 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
2205 if (IS_ERR(inode)) {
ac27a0ec
DK		 2206 es->s_last_orphan = 0;
2207 break;
2208 }
2209
617ba13b 2210 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
871a2931 2211 dquot_initialize(inode);
ac27a0ec 2212 if (inode->i_nlink) {
566370a2
PT		 2213 if (test_opt(sb, DEBUG))
2214 ext4_msg(sb, KERN_DEBUG,
2215 "%s: truncating inode %lu to %lld bytes",
2216 __func__, inode->i_ino, inode->i_size);
e5f8eab8 2217 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
ac27a0ec 2218 inode->i_ino, inode->i_size);
721e3eba 2219 mutex_lock(&inode->i_mutex);
55f252c9 2220 truncate_inode_pages(inode->i_mapping, inode->i_size);
617ba13b 2221 ext4_truncate(inode);
721e3eba 2222 mutex_unlock(&inode->i_mutex);
ac27a0ec
DK		 2223 nr_truncates++;
2224 } else {
566370a2
PT		 2225 if (test_opt(sb, DEBUG))
2226 ext4_msg(sb, KERN_DEBUG,
2227 "%s: deleting unreferenced inode %lu",
2228 __func__, inode->i_ino);
ac27a0ec
DK		 2229 jbd_debug(2, "deleting unreferenced inode %lu\n",
2230 inode->i_ino);
2231 nr_orphans++;
2232 }
2233 iput(inode); /* The delete magic happens here! */
2234 }
2235
2b2d6d01 2236#define PLURAL(x) (x), ((x) == 1) ? "" : "s"
ac27a0ec
DK		 2237
2238 if (nr_orphans)
b31e1552
ES		 2239 ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
2240 PLURAL(nr_orphans));
ac27a0ec 2241 if (nr_truncates)
b31e1552
ES		 2242 ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
2243 PLURAL(nr_truncates));
ac27a0ec
DK		 2244#ifdef CONFIG_QUOTA
2245 /* Turn quotas off */
a2d4a646 2246 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
ac27a0ec 2247 if (sb_dqopt(sb)->files[i])
287a8095 2248 dquot_quota_off(sb, i);
ac27a0ec
DK		 2249 }
2250#endif
2251 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
2252}
0b8e58a1 2253
cd2291a4
ES		 2254/*
2255 * Maximal extent format file size.
2256 * Resulting logical blkno at s_maxbytes must fit in our on-disk
2257 * extent format containers, within a sector_t, and within i_blocks
2258 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
2259 * so that won't be a limiting factor.
2260 *
f17722f9
LC		 2261 * However there is other limiting factor. We do store extents in the form
2262 * of starting block and length, hence the resulting length of the extent
2263 * covering maximum file size must fit into on-disk format containers as
2264 * well. Given that length is always by 1 unit bigger than max unit (because
2265 * we count 0 as well) we have to lower the s_maxbytes by one fs block.
2266 *
cd2291a4
ES		 2267 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
2268 */
f287a1a5 2269static loff_t ext4_max_size(int blkbits, int has_huge_files)
cd2291a4
ES		 2270{
2271 loff_t res;
2272 loff_t upper_limit = MAX_LFS_FILESIZE;
2273
2274 /* small i_blocks in vfs inode? */
f287a1a5 2275 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
cd2291a4 2276 /*
90c699a9 2277 * CONFIG_LBDAF is not enabled implies the inode
cd2291a4
ES		 2278 * i_block represent total blocks in 512 bytes
2279 * 32 == size of vfs inode i_blocks * 8
2280 */
2281 upper_limit = (1LL << 32) - 1;
2282
2283 /* total blocks in file system block size */
2284 upper_limit >>= (blkbits - 9);
2285 upper_limit <<= blkbits;
2286 }
2287
f17722f9
LC		 2288 /*
2289 * 32-bit extent-start container, ee_block. We lower the maxbytes
2290 * by one fs block, so ee_len can cover the extent of maximum file
2291 * size
2292 */
2293 res = (1LL << 32) - 1;
cd2291a4 2294 res <<= blkbits;
cd2291a4
ES		 2295
2296 /* Sanity check against vm- & vfs- imposed limits */
2297 if (res > upper_limit)
2298 res = upper_limit;
2299
2300 return res;
2301}
ac27a0ec 2302
ac27a0ec 2303/*
cd2291a4 2304 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
0fc1b451
AK		 2305 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2306 * We need to be 1 filesystem block less than the 2^48 sector limit.
ac27a0ec 2307 */
f287a1a5 2308static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
ac27a0ec 2309{
617ba13b 2310 loff_t res = EXT4_NDIR_BLOCKS;
0fc1b451
AK		 2311 int meta_blocks;
2312 loff_t upper_limit;
0b8e58a1
AD		 2313 /* This is calculated to be the largest file size for a dense, block
2314 * mapped file such that the file's total number of 512-byte sectors,
2315 * including data and all indirect blocks, does not exceed (2^48 - 1).
2316 *
2317 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2318 * number of 512-byte sectors of the file.
0fc1b451
AK		 2319 */
2320
f287a1a5 2321 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
0fc1b451 2322 /*
90c699a9 2323 * !has_huge_files or CONFIG_LBDAF not enabled implies that
0b8e58a1
AD		 2324 * the inode i_block field represents total file blocks in
2325 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
0fc1b451
AK		 2326 */
2327 upper_limit = (1LL << 32) - 1;
2328
2329 /* total blocks in file system block size */
2330 upper_limit >>= (bits - 9);
2331
2332 } else {
8180a562
AK		 2333 /*
2334 * We use 48 bit ext4_inode i_blocks
2335 * With EXT4_HUGE_FILE_FL set the i_blocks
2336 * represent total number of blocks in
2337 * file system block size
2338 */
0fc1b451
AK		 2339 upper_limit = (1LL << 48) - 1;
2340
0fc1b451
AK		 2341 }
2342
2343 /* indirect blocks */
2344 meta_blocks = 1;
2345 /* double indirect blocks */
2346 meta_blocks += 1 + (1LL << (bits-2));
2347 /* tripple indirect blocks */
2348 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
2349
2350 upper_limit -= meta_blocks;
2351 upper_limit <<= bits;
ac27a0ec
DK		 2352
2353 res += 1LL << (bits-2);
2354 res += 1LL << (2*(bits-2));
2355 res += 1LL << (3*(bits-2));
2356 res <<= bits;
2357 if (res > upper_limit)
2358 res = upper_limit;
0fc1b451
AK		 2359
2360 if (res > MAX_LFS_FILESIZE)
2361 res = MAX_LFS_FILESIZE;
2362
ac27a0ec
DK		 2363 return res;
2364}
2365
617ba13b 2366static ext4_fsblk_t descriptor_loc(struct super_block *sb,
0b8e58a1 2367 ext4_fsblk_t logical_sb_block, int nr)
ac27a0ec 2368{
617ba13b 2369 struct ext4_sb_info *sbi = EXT4_SB(sb);
fd2d4291 2370 ext4_group_t bg, first_meta_bg;
ac27a0ec
DK		 2371 int has_super = 0;
2372
2373 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
2374
617ba13b 2375 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
ac27a0ec 2376 nr < first_meta_bg)
70bbb3e0 2377 return logical_sb_block + nr + 1;
ac27a0ec 2378 bg = sbi->s_desc_per_block * nr;
617ba13b 2379 if (ext4_bg_has_super(sb, bg))
ac27a0ec 2380 has_super = 1;
0b8e58a1 2381
bd63f6b0
DW		 2382 /*
2383 * If we have a meta_bg fs with 1k blocks, group 0's GDT is at
2384 * block 2, not 1. If s_first_data_block == 0 (bigalloc is enabled
2385 * on modern mke2fs or blksize > 1k on older mke2fs) then we must
2386 * compensate.
2387 */
2388 if (sb->s_blocksize == 1024 && nr == 0 &&
2389 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block) == 0)
2390 has_super++;
2391
617ba13b 2392 return (has_super + ext4_group_first_block_no(sb, bg));
ac27a0ec
DK		 2393}
2394
c9de560d
AT		 2395/**
2396 * ext4_get_stripe_size: Get the stripe size.
2397 * @sbi: In memory super block info
2398 *
2399 * If we have specified it via mount option, then
2400 * use the mount option value. If the value specified at mount time is
2401 * greater than the blocks per group use the super block value.
2402 * If the super block value is greater than blocks per group return 0.
2403 * Allocator needs it be less than blocks per group.
2404 *
2405 */
2406static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
2407{
2408 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
2409 unsigned long stripe_width =
2410 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
3eb08658 2411 int ret;
c9de560d
AT		 2412
2413 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
3eb08658
DE		 2414 ret = sbi->s_stripe;
2415 else if (stripe_width <= sbi->s_blocks_per_group)
2416 ret = stripe_width;
2417 else if (stride <= sbi->s_blocks_per_group)
2418 ret = stride;
2419 else
2420 ret = 0;
c9de560d 2421
3eb08658
DE		 2422 /*
2423 * If the stripe width is 1, this makes no sense and
2424 * we set it to 0 to turn off stripe handling code.
2425 */
2426 if (ret <= 1)
2427 ret = 0;
c9de560d 2428
3eb08658 2429 return ret;
c9de560d 2430}
ac27a0ec 2431
3197ebdb
TT		 2432/* sysfs supprt */
2433
2434struct ext4_attr {
2435 struct attribute attr;
2436 ssize_t (*show)(struct ext4_attr *, struct ext4_sb_info *, char *);
60e6679e 2437 ssize_t (*store)(struct ext4_attr *, struct ext4_sb_info *,
3197ebdb 2438 const char *, size_t);
f2d50a65
JK		 2439 union {
2440 int offset;
2441 int deprecated_val;
2442 } u;
3197ebdb
TT		 2443};
2444
27dd4385
LC		 2445static int parse_strtoull(const char *buf,
2446 unsigned long long max, unsigned long long *value)
2447{
2448 int ret;
2449
2450 ret = kstrtoull(skip_spaces(buf), 0, value);
2451 if (!ret && *value > max)
2452 ret = -EINVAL;
2453 return ret;
2454}
2455
3197ebdb
TT		 2456static ssize_t delayed_allocation_blocks_show(struct ext4_attr *a,
2457 struct ext4_sb_info *sbi,
2458 char *buf)
2459{
2460 return snprintf(buf, PAGE_SIZE, "%llu\n",
7b415bf6
AK		 2461 (s64) EXT4_C2B(sbi,
2462 percpu_counter_sum(&sbi->s_dirtyclusters_counter)));
3197ebdb
TT		 2463}
2464
2465static ssize_t session_write_kbytes_show(struct ext4_attr *a,
2466 struct ext4_sb_info *sbi, char *buf)
2467{
2468 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2469
f613dfcb
TT		 2470 if (!sb->s_bdev->bd_part)
2471 return snprintf(buf, PAGE_SIZE, "0\n");
3197ebdb
TT		 2472 return snprintf(buf, PAGE_SIZE, "%lu\n",
2473 (part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
2474 sbi->s_sectors_written_start) >> 1);
2475}
2476
2477static ssize_t lifetime_write_kbytes_show(struct ext4_attr *a,
2478 struct ext4_sb_info *sbi, char *buf)
2479{
2480 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2481
f613dfcb
TT		 2482 if (!sb->s_bdev->bd_part)
2483 return snprintf(buf, PAGE_SIZE, "0\n");
3197ebdb 2484 return snprintf(buf, PAGE_SIZE, "%llu\n",
a6b43e38 2485 (unsigned long long)(sbi->s_kbytes_written +
3197ebdb 2486 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
a6b43e38 2487 EXT4_SB(sb)->s_sectors_written_start) >> 1)));
3197ebdb
TT		 2488}
2489
2490static ssize_t inode_readahead_blks_store(struct ext4_attr *a,
2491 struct ext4_sb_info *sbi,
2492 const char *buf, size_t count)
2493{
2494 unsigned long t;
e1091b15 2495 int ret;
3197ebdb 2496
e1091b15
LC		 2497 ret = kstrtoul(skip_spaces(buf), 0, &t);
2498 if (ret)
2499 return ret;
3197ebdb 2500
e1091b15 2501 if (t && (!is_power_of_2(t) || t > 0x40000000))
3197ebdb
TT		 2502 return -EINVAL;
2503
2504 sbi->s_inode_readahead_blks = t;
2505 return count;
2506}
2507
2508static ssize_t sbi_ui_show(struct ext4_attr *a,
0b8e58a1 2509 struct ext4_sb_info *sbi, char *buf)
3197ebdb 2510{
f2d50a65 2511 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->u.offset);
3197ebdb
TT		 2512
2513 return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
2514}
2515
2516static ssize_t sbi_ui_store(struct ext4_attr *a,
2517 struct ext4_sb_info *sbi,
2518 const char *buf, size_t count)
2519{
f2d50a65 2520 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->u.offset);
3197ebdb 2521 unsigned long t;
e1091b15 2522 int ret;
3197ebdb 2523
e1091b15
LC		 2524 ret = kstrtoul(skip_spaces(buf), 0, &t);
2525 if (ret)
2526 return ret;
3197ebdb
TT		 2527 *ui = t;
2528 return count;
2529}
2530
52c198c6
LC		 2531static ssize_t es_ui_show(struct ext4_attr *a,
2532 struct ext4_sb_info *sbi, char *buf)
2533{
2534
2535 unsigned int *ui = (unsigned int *) (((char *) sbi->s_es) +
2536 a->u.offset);
2537
2538 return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
2539}
2540
27dd4385
LC		 2541static ssize_t reserved_clusters_show(struct ext4_attr *a,
2542 struct ext4_sb_info *sbi, char *buf)
2543{
2544 return snprintf(buf, PAGE_SIZE, "%llu\n",
2545 (unsigned long long) atomic64_read(&sbi->s_resv_clusters));
2546}
2547
2548static ssize_t reserved_clusters_store(struct ext4_attr *a,
2549 struct ext4_sb_info *sbi,
2550 const char *buf, size_t count)
2551{
2552 unsigned long long val;
2553 int ret;
2554
2555 if (parse_strtoull(buf, -1ULL, &val))
2556 return -EINVAL;
2557 ret = ext4_reserve_clusters(sbi, val);
2558
2559 return ret ? ret : count;
2560}
2561
2c0544b2
TT		 2562static ssize_t trigger_test_error(struct ext4_attr *a,
2563 struct ext4_sb_info *sbi,
2564 const char *buf, size_t count)
2565{
2566 int len = count;
2567
2568 if (!capable(CAP_SYS_ADMIN))
2569 return -EPERM;
2570
2571 if (len && buf[len-1] == '\n')
2572 len--;
2573
2574 if (len)
2575 ext4_error(sbi->s_sb, "%.*s", len, buf);
2576 return count;
2577}
2578
f2d50a65
JK		 2579static ssize_t sbi_deprecated_show(struct ext4_attr *a,
2580 struct ext4_sb_info *sbi, char *buf)
2581{
2582 return snprintf(buf, PAGE_SIZE, "%d\n", a->u.deprecated_val);
2583}
2584
3197ebdb
TT		 2585#define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \
2586static struct ext4_attr ext4_attr_##_name = { \
2587 .attr = {.name = __stringify(_name), .mode = _mode }, \
2588 .show = _show, \
2589 .store = _store, \
f2d50a65
JK		 2590 .u = { \
2591 .offset = offsetof(struct ext4_sb_info, _elname),\
2592 }, \
3197ebdb 2593}
52c198c6
LC		 2594
2595#define EXT4_ATTR_OFFSET_ES(_name,_mode,_show,_store,_elname) \
2596static struct ext4_attr ext4_attr_##_name = { \
2597 .attr = {.name = __stringify(_name), .mode = _mode }, \
2598 .show = _show, \
2599 .store = _store, \
2600 .u = { \
2601 .offset = offsetof(struct ext4_super_block, _elname), \
2602 }, \
2603}
2604
3197ebdb
TT		 2605#define EXT4_ATTR(name, mode, show, store) \
2606static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store)
2607
857ac889 2608#define EXT4_INFO_ATTR(name) EXT4_ATTR(name, 0444, NULL, NULL)
3197ebdb
TT		 2609#define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL)
2610#define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store)
52c198c6
LC		 2611
2612#define EXT4_RO_ATTR_ES_UI(name, elname) \
2613 EXT4_ATTR_OFFSET_ES(name, 0444, es_ui_show, NULL, elname)
3197ebdb
TT		 2614#define EXT4_RW_ATTR_SBI_UI(name, elname) \
2615 EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname)
52c198c6 2616
3197ebdb 2617#define ATTR_LIST(name) &ext4_attr_##name.attr
f2d50a65
JK		 2618#define EXT4_DEPRECATED_ATTR(_name, _val) \
2619static struct ext4_attr ext4_attr_##_name = { \
2620 .attr = {.name = __stringify(_name), .mode = 0444 }, \
2621 .show = sbi_deprecated_show, \
2622 .u = { \
2623 .deprecated_val = _val, \
2624 }, \
2625}
3197ebdb
TT		 2626
2627EXT4_RO_ATTR(delayed_allocation_blocks);
2628EXT4_RO_ATTR(session_write_kbytes);
2629EXT4_RO_ATTR(lifetime_write_kbytes);
27dd4385 2630EXT4_RW_ATTR(reserved_clusters);
3197ebdb
TT		 2631EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, sbi_ui_show,
2632 inode_readahead_blks_store, s_inode_readahead_blks);
11013911 2633EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal);
3197ebdb
TT		 2634EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats);
2635EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan);
2636EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan);
2637EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs);
2638EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request);
2639EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc);
f2d50a65 2640EXT4_DEPRECATED_ATTR(max_writeback_mb_bump, 128);
67a5da56 2641EXT4_RW_ATTR_SBI_UI(extent_max_zeroout_kb, s_extent_max_zeroout_kb);
2c0544b2 2642EXT4_ATTR(trigger_fs_error, 0200, NULL, trigger_test_error);
efbed4dc
TT		 2643EXT4_RW_ATTR_SBI_UI(err_ratelimit_interval_ms, s_err_ratelimit_state.interval);
2644EXT4_RW_ATTR_SBI_UI(err_ratelimit_burst, s_err_ratelimit_state.burst);
2645EXT4_RW_ATTR_SBI_UI(warning_ratelimit_interval_ms, s_warning_ratelimit_state.interval);
2646EXT4_RW_ATTR_SBI_UI(warning_ratelimit_burst, s_warning_ratelimit_state.burst);
2647EXT4_RW_ATTR_SBI_UI(msg_ratelimit_interval_ms, s_msg_ratelimit_state.interval);
2648EXT4_RW_ATTR_SBI_UI(msg_ratelimit_burst, s_msg_ratelimit_state.burst);
52c198c6
LC		 2649EXT4_RO_ATTR_ES_UI(errors_count, s_error_count);
2650EXT4_RO_ATTR_ES_UI(first_error_time, s_first_error_time);
2651EXT4_RO_ATTR_ES_UI(last_error_time, s_last_error_time);
3197ebdb
TT		 2652
2653static struct attribute *ext4_attrs[] = {
2654 ATTR_LIST(delayed_allocation_blocks),
2655 ATTR_LIST(session_write_kbytes),
2656 ATTR_LIST(lifetime_write_kbytes),
27dd4385 2657 ATTR_LIST(reserved_clusters),
3197ebdb 2658 ATTR_LIST(inode_readahead_blks),
11013911 2659 ATTR_LIST(inode_goal),
3197ebdb
TT		 2660 ATTR_LIST(mb_stats),
2661 ATTR_LIST(mb_max_to_scan),
2662 ATTR_LIST(mb_min_to_scan),
2663 ATTR_LIST(mb_order2_req),
2664 ATTR_LIST(mb_stream_req),
2665 ATTR_LIST(mb_group_prealloc),
55138e0b 2666 ATTR_LIST(max_writeback_mb_bump),
67a5da56 2667 ATTR_LIST(extent_max_zeroout_kb),
2c0544b2 2668 ATTR_LIST(trigger_fs_error),
efbed4dc
TT		 2669 ATTR_LIST(err_ratelimit_interval_ms),
2670 ATTR_LIST(err_ratelimit_burst),
2671 ATTR_LIST(warning_ratelimit_interval_ms),
2672 ATTR_LIST(warning_ratelimit_burst),
2673 ATTR_LIST(msg_ratelimit_interval_ms),
2674 ATTR_LIST(msg_ratelimit_burst),
52c198c6
LC		 2675 ATTR_LIST(errors_count),
2676 ATTR_LIST(first_error_time),
2677 ATTR_LIST(last_error_time),
3197ebdb
TT		 2678 NULL,
2679};
2680
857ac889
LC		 2681/* Features this copy of ext4 supports */
2682EXT4_INFO_ATTR(lazy_itable_init);
27ee40df 2683EXT4_INFO_ATTR(batched_discard);
5e7bbef1 2684EXT4_INFO_ATTR(meta_bg_resize);
6ddb2447 2685EXT4_INFO_ATTR(encryption);
857ac889
LC		 2686
2687static struct attribute *ext4_feat_attrs[] = {
2688 ATTR_LIST(lazy_itable_init),
27ee40df 2689 ATTR_LIST(batched_discard),
5e7bbef1 2690 ATTR_LIST(meta_bg_resize),
6ddb2447 2691 ATTR_LIST(encryption),
857ac889
LC		 2692 NULL,
2693};
2694
3197ebdb
TT		 2695static ssize_t ext4_attr_show(struct kobject *kobj,
2696 struct attribute *attr, char *buf)
2697{
2698 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2699 s_kobj);
2700 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2701
2702 return a->show ? a->show(a, sbi, buf) : 0;
2703}
2704
2705static ssize_t ext4_attr_store(struct kobject *kobj,
2706 struct attribute *attr,
2707 const char *buf, size_t len)
2708{
2709 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2710 s_kobj);
2711 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2712
2713 return a->store ? a->store(a, sbi, buf, len) : 0;
2714}
2715
2716static void ext4_sb_release(struct kobject *kobj)
2717{
2718 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2719 s_kobj);
2720 complete(&sbi->s_kobj_unregister);
2721}
2722
52cf25d0 2723static const struct sysfs_ops ext4_attr_ops = {
3197ebdb
TT		 2724 .show = ext4_attr_show,
2725 .store = ext4_attr_store,
2726};
2727
2728static struct kobj_type ext4_ktype = {
2729 .default_attrs = ext4_attrs,
2730 .sysfs_ops = &ext4_attr_ops,
2731 .release = ext4_sb_release,
2732};
2733
857ac889
LC		 2734static void ext4_feat_release(struct kobject *kobj)
2735{
2736 complete(&ext4_feat->f_kobj_unregister);
2737}
2738
c7f72543
LC		 2739static ssize_t ext4_feat_show(struct kobject *kobj,
2740 struct attribute *attr, char *buf)
2741{
2742 return snprintf(buf, PAGE_SIZE, "supported\n");
2743}
2744
2745/*
2746 * We can not use ext4_attr_show/store because it relies on the kobject
2747 * being embedded in the ext4_sb_info structure which is definitely not
2748 * true in this case.
2749 */
2750static const struct sysfs_ops ext4_feat_ops = {
2751 .show = ext4_feat_show,
2752 .store = NULL,
2753};
2754
857ac889
LC		 2755static struct kobj_type ext4_feat_ktype = {
2756 .default_attrs = ext4_feat_attrs,
c7f72543 2757 .sysfs_ops = &ext4_feat_ops,
857ac889
LC		 2758 .release = ext4_feat_release,
2759};
2760
a13fb1a4
ES		 2761/*
2762 * Check whether this filesystem can be mounted based on
2763 * the features present and the RDONLY/RDWR mount requested.
2764 * Returns 1 if this filesystem can be mounted as requested,
2765 * 0 if it cannot be.
2766 */
2767static int ext4_feature_set_ok(struct super_block *sb, int readonly)
2768{
2769 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP)) {
2770 ext4_msg(sb, KERN_ERR,
2771 "Couldn't mount because of "
2772 "unsupported optional features (%x)",
2773 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
2774 ~EXT4_FEATURE_INCOMPAT_SUPP));
2775 return 0;
2776 }
2777
2778 if (readonly)
2779 return 1;
2780
2cb5cc8b
DW		 2781 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_READONLY)) {
2782 ext4_msg(sb, KERN_INFO, "filesystem is read-only");
2783 sb->s_flags |= MS_RDONLY;
2784 return 1;
2785 }
2786
a13fb1a4
ES		 2787 /* Check that feature set is OK for a read-write mount */
2788 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP)) {
2789 ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of "
2790 "unsupported optional features (%x)",
2791 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
2792 ~EXT4_FEATURE_RO_COMPAT_SUPP));
2793 return 0;
2794 }
2795 /*
2796 * Large file size enabled file system can only be mounted
2797 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
2798 */
2799 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) {
2800 if (sizeof(blkcnt_t) < sizeof(u64)) {
2801 ext4_msg(sb, KERN_ERR, "Filesystem with huge files "
2802 "cannot be mounted RDWR without "
2803 "CONFIG_LBDAF");
2804 return 0;
2805 }
2806 }
bab08ab9
TT		 2807 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_BIGALLOC) &&
2808 !EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS)) {
2809 ext4_msg(sb, KERN_ERR,
2810 "Can't support bigalloc feature without "
2811 "extents feature\n");
2812 return 0;
2813 }
7c319d32
AK		 2814
2815#ifndef CONFIG_QUOTA
2816 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) &&
2817 !readonly) {
2818 ext4_msg(sb, KERN_ERR,
2819 "Filesystem with quota feature cannot be mounted RDWR "
2820 "without CONFIG_QUOTA");
2821 return 0;
2822 }
2823#endif /* CONFIG_QUOTA */
a13fb1a4
ES		 2824 return 1;
2825}
2826
66e61a9e
TT		 2827/*
2828 * This function is called once a day if we have errors logged
2829 * on the file system
2830 */
2831static void print_daily_error_info(unsigned long arg)
2832{
2833 struct super_block *sb = (struct super_block *) arg;
2834 struct ext4_sb_info *sbi;
2835 struct ext4_super_block *es;
2836
2837 sbi = EXT4_SB(sb);
2838 es = sbi->s_es;
2839
2840 if (es->s_error_count)
ae0f78de
TT		 2841 /* fsck newer than v1.41.13 is needed to clean this condition. */
2842 ext4_msg(sb, KERN_NOTICE, "error count since last fsck: %u",
66e61a9e
TT		 2843 le32_to_cpu(es->s_error_count));
2844 if (es->s_first_error_time) {
ae0f78de 2845 printk(KERN_NOTICE "EXT4-fs (%s): initial error at time %u: %.*s:%d",
66e61a9e
TT		 2846 sb->s_id, le32_to_cpu(es->s_first_error_time),
2847 (int) sizeof(es->s_first_error_func),
2848 es->s_first_error_func,
2849 le32_to_cpu(es->s_first_error_line));
2850 if (es->s_first_error_ino)
2851 printk(": inode %u",
2852 le32_to_cpu(es->s_first_error_ino));
2853 if (es->s_first_error_block)
2854 printk(": block %llu", (unsigned long long)
2855 le64_to_cpu(es->s_first_error_block));
2856 printk("\n");
2857 }
2858 if (es->s_last_error_time) {
ae0f78de 2859 printk(KERN_NOTICE "EXT4-fs (%s): last error at time %u: %.*s:%d",
66e61a9e
TT		 2860 sb->s_id, le32_to_cpu(es->s_last_error_time),
2861 (int) sizeof(es->s_last_error_func),
2862 es->s_last_error_func,
2863 le32_to_cpu(es->s_last_error_line));
2864 if (es->s_last_error_ino)
2865 printk(": inode %u",
2866 le32_to_cpu(es->s_last_error_ino));
2867 if (es->s_last_error_block)
2868 printk(": block %llu", (unsigned long long)
2869 le64_to_cpu(es->s_last_error_block));
2870 printk("\n");
2871 }
2872 mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ); /* Once a day */
2873}
2874
bfff6873
LC		 2875/* Find next suitable group and run ext4_init_inode_table */
2876static int ext4_run_li_request(struct ext4_li_request *elr)
2877{
2878 struct ext4_group_desc *gdp = NULL;
2879 ext4_group_t group, ngroups;
2880 struct super_block *sb;
2881 unsigned long timeout = 0;
2882 int ret = 0;
2883
2884 sb = elr->lr_super;
2885 ngroups = EXT4_SB(sb)->s_groups_count;
2886
8e8ad8a5 2887 sb_start_write(sb);
bfff6873
LC		 2888 for (group = elr->lr_next_group; group < ngroups; group++) {
2889 gdp = ext4_get_group_desc(sb, group, NULL);
2890 if (!gdp) {
2891 ret = 1;
2892 break;
2893 }
2894
2895 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2896 break;
2897 }
2898
7f511862 2899 if (group >= ngroups)
bfff6873
LC		 2900 ret = 1;
2901
2902 if (!ret) {
2903 timeout = jiffies;
2904 ret = ext4_init_inode_table(sb, group,
2905 elr->lr_timeout ? 0 : 1);
2906 if (elr->lr_timeout == 0) {
51ce6511
LC		 2907 timeout = (jiffies - timeout) *
2908 elr->lr_sbi->s_li_wait_mult;
bfff6873
LC		 2909 elr->lr_timeout = timeout;
2910 }
2911 elr->lr_next_sched = jiffies + elr->lr_timeout;
2912 elr->lr_next_group = group + 1;
2913 }
8e8ad8a5 2914 sb_end_write(sb);
bfff6873
LC		 2915
2916 return ret;
2917}
2918
2919/*
2920 * Remove lr_request from the list_request and free the
4ed5c033 2921 * request structure. Should be called with li_list_mtx held
bfff6873
LC		 2922 */
2923static void ext4_remove_li_request(struct ext4_li_request *elr)
2924{
2925 struct ext4_sb_info *sbi;
2926
2927 if (!elr)
2928 return;
2929
2930 sbi = elr->lr_sbi;
2931
2932 list_del(&elr->lr_request);
2933 sbi->s_li_request = NULL;
2934 kfree(elr);
2935}
2936
2937static void ext4_unregister_li_request(struct super_block *sb)
2938{
1bb933fb
LC		 2939 mutex_lock(&ext4_li_mtx);
2940 if (!ext4_li_info) {
2941 mutex_unlock(&ext4_li_mtx);
bfff6873 2942 return;
1bb933fb 2943 }
bfff6873
LC		 2944
2945 mutex_lock(&ext4_li_info->li_list_mtx);
1bb933fb 2946 ext4_remove_li_request(EXT4_SB(sb)->s_li_request);
bfff6873 2947 mutex_unlock(&ext4_li_info->li_list_mtx);
1bb933fb 2948 mutex_unlock(&ext4_li_mtx);
bfff6873
LC		 2949}
2950
8f1f7453
ES		 2951static struct task_struct *ext4_lazyinit_task;
2952
bfff6873
LC		 2953/*
2954 * This is the function where ext4lazyinit thread lives. It walks
2955 * through the request list searching for next scheduled filesystem.
2956 * When such a fs is found, run the lazy initialization request
2957 * (ext4_rn_li_request) and keep track of the time spend in this
2958 * function. Based on that time we compute next schedule time of
2959 * the request. When walking through the list is complete, compute
2960 * next waking time and put itself into sleep.
2961 */
2962static int ext4_lazyinit_thread(void *arg)
2963{
2964 struct ext4_lazy_init *eli = (struct ext4_lazy_init *)arg;
2965 struct list_head *pos, *n;
2966 struct ext4_li_request *elr;
4ed5c033 2967 unsigned long next_wakeup, cur;
bfff6873
LC		 2968
2969 BUG_ON(NULL == eli);
2970
bfff6873
LC		 2971cont_thread:
2972 while (true) {
2973 next_wakeup = MAX_JIFFY_OFFSET;
2974
2975 mutex_lock(&eli->li_list_mtx);
2976 if (list_empty(&eli->li_request_list)) {
2977 mutex_unlock(&eli->li_list_mtx);
2978 goto exit_thread;
2979 }
2980
2981 list_for_each_safe(pos, n, &eli->li_request_list) {
2982 elr = list_entry(pos, struct ext4_li_request,
2983 lr_request);
2984
b2c78cd0
TT		 2985 if (time_after_eq(jiffies, elr->lr_next_sched)) {
2986 if (ext4_run_li_request(elr) != 0) {
2987 /* error, remove the lazy_init job */
2988 ext4_remove_li_request(elr);
2989 continue;
2990 }
bfff6873
LC		 2991 }
2992
2993 if (time_before(elr->lr_next_sched, next_wakeup))
2994 next_wakeup = elr->lr_next_sched;
2995 }
2996 mutex_unlock(&eli->li_list_mtx);
2997
a0acae0e 2998 try_to_freeze();
bfff6873 2999
4ed5c033
LC		 3000 cur = jiffies;
3001 if ((time_after_eq(cur, next_wakeup)) ||
f4245bd4 3002 (MAX_JIFFY_OFFSET == next_wakeup)) {
bfff6873
LC		 3003 cond_resched();
3004 continue;
3005 }
3006
4ed5c033
LC		 3007 schedule_timeout_interruptible(next_wakeup - cur);
3008
8f1f7453
ES		 3009 if (kthread_should_stop()) {
3010 ext4_clear_request_list();
3011 goto exit_thread;
3012 }
bfff6873
LC		 3013 }
3014
3015exit_thread:
3016 /*
3017 * It looks like the request list is empty, but we need
3018 * to check it under the li_list_mtx lock, to prevent any
3019 * additions into it, and of course we should lock ext4_li_mtx
3020 * to atomically free the list and ext4_li_info, because at
3021 * this point another ext4 filesystem could be registering
3022 * new one.
3023 */
3024 mutex_lock(&ext4_li_mtx);
3025 mutex_lock(&eli->li_list_mtx);
3026 if (!list_empty(&eli->li_request_list)) {
3027 mutex_unlock(&eli->li_list_mtx);
3028 mutex_unlock(&ext4_li_mtx);
3029 goto cont_thread;
3030 }
3031 mutex_unlock(&eli->li_list_mtx);
bfff6873
LC		 3032 kfree(ext4_li_info);
3033 ext4_li_info = NULL;
3034 mutex_unlock(&ext4_li_mtx);
3035
3036 return 0;
3037}
3038
3039static void ext4_clear_request_list(void)
3040{
3041 struct list_head *pos, *n;
3042 struct ext4_li_request *elr;
3043
3044 mutex_lock(&ext4_li_info->li_list_mtx);
bfff6873
LC		 3045 list_for_each_safe(pos, n, &ext4_li_info->li_request_list) {
3046 elr = list_entry(pos, struct ext4_li_request,
3047 lr_request);
3048 ext4_remove_li_request(elr);
3049 }
3050 mutex_unlock(&ext4_li_info->li_list_mtx);
3051}
3052
3053static int ext4_run_lazyinit_thread(void)
3054{
8f1f7453
ES		 3055 ext4_lazyinit_task = kthread_run(ext4_lazyinit_thread,
3056 ext4_li_info, "ext4lazyinit");
3057 if (IS_ERR(ext4_lazyinit_task)) {
3058 int err = PTR_ERR(ext4_lazyinit_task);
bfff6873 3059 ext4_clear_request_list();
bfff6873
LC		 3060 kfree(ext4_li_info);
3061 ext4_li_info = NULL;
92b97816 3062 printk(KERN_CRIT "EXT4-fs: error %d creating inode table "
bfff6873
LC		 3063 "initialization thread\n",
3064 err);
3065 return err;
3066 }
3067 ext4_li_info->li_state |= EXT4_LAZYINIT_RUNNING;
bfff6873
LC		 3068 return 0;
3069}
3070
3071/*
3072 * Check whether it make sense to run itable init. thread or not.
3073 * If there is at least one uninitialized inode table, return
3074 * corresponding group number, else the loop goes through all
3075 * groups and return total number of groups.
3076 */
3077static ext4_group_t ext4_has_uninit_itable(struct super_block *sb)
3078{
3079 ext4_group_t group, ngroups = EXT4_SB(sb)->s_groups_count;
3080 struct ext4_group_desc *gdp = NULL;
3081
3082 for (group = 0; group < ngroups; group++) {
3083 gdp = ext4_get_group_desc(sb, group, NULL);
3084 if (!gdp)
3085 continue;
3086
3087 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
3088 break;
3089 }
3090
3091 return group;
3092}
3093
3094static int ext4_li_info_new(void)
3095{
3096 struct ext4_lazy_init *eli = NULL;
3097
3098 eli = kzalloc(sizeof(*eli), GFP_KERNEL);
3099 if (!eli)
3100 return -ENOMEM;
3101
bfff6873
LC		 3102 INIT_LIST_HEAD(&eli->li_request_list);
3103 mutex_init(&eli->li_list_mtx);
3104
bfff6873
LC		 3105 eli->li_state |= EXT4_LAZYINIT_QUIT;
3106
3107 ext4_li_info = eli;
3108
3109 return 0;
3110}
3111
3112static struct ext4_li_request *ext4_li_request_new(struct super_block *sb,
3113 ext4_group_t start)
3114{
3115 struct ext4_sb_info *sbi = EXT4_SB(sb);
3116 struct ext4_li_request *elr;
bfff6873
LC		 3117
3118 elr = kzalloc(sizeof(*elr), GFP_KERNEL);
3119 if (!elr)
3120 return NULL;
3121
3122 elr->lr_super = sb;
3123 elr->lr_sbi = sbi;
3124 elr->lr_next_group = start;
3125
3126 /*
3127 * Randomize first schedule time of the request to
3128 * spread the inode table initialization requests
3129 * better.
3130 */
dd1f723b
TT		 3131 elr->lr_next_sched = jiffies + (prandom_u32() %
3132 (EXT4_DEF_LI_MAX_START_DELAY * HZ));
bfff6873
LC		 3133 return elr;
3134}
3135
7f511862
TT		 3136int ext4_register_li_request(struct super_block *sb,
3137 ext4_group_t first_not_zeroed)
bfff6873
LC		 3138{
3139 struct ext4_sb_info *sbi = EXT4_SB(sb);
7f511862 3140 struct ext4_li_request *elr = NULL;
bfff6873 3141 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
6c5a6cb9 3142 int ret = 0;
bfff6873 3143
7f511862 3144 mutex_lock(&ext4_li_mtx);
51ce6511
LC		 3145 if (sbi->s_li_request != NULL) {
3146 /*
3147 * Reset timeout so it can be computed again, because
3148 * s_li_wait_mult might have changed.
3149 */
3150 sbi->s_li_request->lr_timeout = 0;
7f511862 3151 goto out;
51ce6511 3152 }
bfff6873
LC		 3153
3154 if (first_not_zeroed == ngroups ||
3155 (sb->s_flags & MS_RDONLY) ||
55ff3840 3156 !test_opt(sb, INIT_INODE_TABLE))
7f511862 3157 goto out;
bfff6873
LC		 3158
3159 elr = ext4_li_request_new(sb, first_not_zeroed);
7f511862
TT		 3160 if (!elr) {
3161 ret = -ENOMEM;
3162 goto out;
3163 }
bfff6873
LC		 3164
3165 if (NULL == ext4_li_info) {
3166 ret = ext4_li_info_new();
3167 if (ret)
3168 goto out;
3169 }
3170
3171 mutex_lock(&ext4_li_info->li_list_mtx);
3172 list_add(&elr->lr_request, &ext4_li_info->li_request_list);
3173 mutex_unlock(&ext4_li_info->li_list_mtx);
3174
3175 sbi->s_li_request = elr;
46e4690b
TM		 3176 /*
3177 * set elr to NULL here since it has been inserted to
3178 * the request_list and the removal and free of it is
3179 * handled by ext4_clear_request_list from now on.
3180 */
3181 elr = NULL;
bfff6873
LC		 3182
3183 if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) {
3184 ret = ext4_run_lazyinit_thread();
3185 if (ret)
3186 goto out;
3187 }
bfff6873 3188out:
beed5ecb
NK		 3189 mutex_unlock(&ext4_li_mtx);
3190 if (ret)
bfff6873 3191 kfree(elr);
bfff6873
LC		 3192 return ret;
3193}
3194
3195/*
3196 * We do not need to lock anything since this is called on
3197 * module unload.
3198 */
3199static void ext4_destroy_lazyinit_thread(void)
3200{
3201 /*
3202 * If thread exited earlier
3203 * there's nothing to be done.
3204 */
8f1f7453 3205 if (!ext4_li_info || !ext4_lazyinit_task)
bfff6873
LC		 3206 return;
3207
8f1f7453 3208 kthread_stop(ext4_lazyinit_task);
bfff6873
LC		 3209}
3210
25ed6e8a
DW		 3211static int set_journal_csum_feature_set(struct super_block *sb)
3212{
3213 int ret = 1;
3214 int compat, incompat;
3215 struct ext4_sb_info *sbi = EXT4_SB(sb);
3216
9aa5d32b 3217 if (ext4_has_metadata_csum(sb)) {
db9ee220 3218 /* journal checksum v3 */
25ed6e8a 3219 compat = 0;
db9ee220 3220 incompat = JBD2_FEATURE_INCOMPAT_CSUM_V3;
25ed6e8a
DW		 3221 } else {
3222 /* journal checksum v1 */
3223 compat = JBD2_FEATURE_COMPAT_CHECKSUM;
3224 incompat = 0;
3225 }
3226
feb8c6d3
DW		 3227 jbd2_journal_clear_features(sbi->s_journal,
3228 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
3229 JBD2_FEATURE_INCOMPAT_CSUM_V3 |
3230 JBD2_FEATURE_INCOMPAT_CSUM_V2);
25ed6e8a
DW		 3231 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
3232 ret = jbd2_journal_set_features(sbi->s_journal,
3233 compat, 0,
3234 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT |
3235 incompat);
3236 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
3237 ret = jbd2_journal_set_features(sbi->s_journal,
3238 compat, 0,
3239 incompat);
3240 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
3241 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
3242 } else {
feb8c6d3
DW		 3243 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
3244 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
25ed6e8a
DW		 3245 }
3246
3247 return ret;
3248}
3249
952fc18e
TT		 3250/*
3251 * Note: calculating the overhead so we can be compatible with
3252 * historical BSD practice is quite difficult in the face of
3253 * clusters/bigalloc. This is because multiple metadata blocks from
3254 * different block group can end up in the same allocation cluster.
3255 * Calculating the exact overhead in the face of clustered allocation
3256 * requires either O(all block bitmaps) in memory or O(number of block
3257 * groups**2) in time. We will still calculate the superblock for
3258 * older file systems --- and if we come across with a bigalloc file
3259 * system with zero in s_overhead_clusters the estimate will be close to
3260 * correct especially for very large cluster sizes --- but for newer
3261 * file systems, it's better to calculate this figure once at mkfs
3262 * time, and store it in the superblock. If the superblock value is
3263 * present (even for non-bigalloc file systems), we will use it.
3264 */
3265static int count_overhead(struct super_block *sb, ext4_group_t grp,
3266 char *buf)
3267{
3268 struct ext4_sb_info *sbi = EXT4_SB(sb);
3269 struct ext4_group_desc *gdp;
3270 ext4_fsblk_t first_block, last_block, b;
3271 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3272 int s, j, count = 0;
3273
0548bbb8
TT		 3274 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_BIGALLOC))
3275 return (ext4_bg_has_super(sb, grp) + ext4_bg_num_gdb(sb, grp) +
3276 sbi->s_itb_per_group + 2);
3277
952fc18e
TT		 3278 first_block = le32_to_cpu(sbi->s_es->s_first_data_block) +
3279 (grp * EXT4_BLOCKS_PER_GROUP(sb));
3280 last_block = first_block + EXT4_BLOCKS_PER_GROUP(sb) - 1;
3281 for (i = 0; i < ngroups; i++) {
3282 gdp = ext4_get_group_desc(sb, i, NULL);
3283 b = ext4_block_bitmap(sb, gdp);
3284 if (b >= first_block && b <= last_block) {
3285 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3286 count++;
3287 }
3288 b = ext4_inode_bitmap(sb, gdp);
3289 if (b >= first_block && b <= last_block) {
3290 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3291 count++;
3292 }
3293 b = ext4_inode_table(sb, gdp);
3294 if (b >= first_block && b + sbi->s_itb_per_group <= last_block)
3295 for (j = 0; j < sbi->s_itb_per_group; j++, b++) {
3296 int c = EXT4_B2C(sbi, b - first_block);
3297 ext4_set_bit(c, buf);
3298 count++;
3299 }
3300 if (i != grp)
3301 continue;
3302 s = 0;
3303 if (ext4_bg_has_super(sb, grp)) {
3304 ext4_set_bit(s++, buf);
3305 count++;
3306 }
3307 for (j = ext4_bg_num_gdb(sb, grp); j > 0; j--) {
3308 ext4_set_bit(EXT4_B2C(sbi, s++), buf);
3309 count++;
3310 }
3311 }
3312 if (!count)
3313 return 0;
3314 return EXT4_CLUSTERS_PER_GROUP(sb) -
3315 ext4_count_free(buf, EXT4_CLUSTERS_PER_GROUP(sb) / 8);
3316}
3317
3318/*
3319 * Compute the overhead and stash it in sbi->s_overhead
3320 */
3321int ext4_calculate_overhead(struct super_block *sb)
3322{
3323 struct ext4_sb_info *sbi = EXT4_SB(sb);
3324 struct ext4_super_block *es = sbi->s_es;
3325 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3326 ext4_fsblk_t overhead = 0;
4fdb5543 3327 char *buf = (char *) get_zeroed_page(GFP_NOFS);
952fc18e 3328
952fc18e
TT		 3329 if (!buf)
3330 return -ENOMEM;
3331
3332 /*
3333 * Compute the overhead (FS structures). This is constant
3334 * for a given filesystem unless the number of block groups
3335 * changes so we cache the previous value until it does.
3336 */
3337
3338 /*
3339 * All of the blocks before first_data_block are overhead
3340 */
3341 overhead = EXT4_B2C(sbi, le32_to_cpu(es->s_first_data_block));
3342
3343 /*
3344 * Add the overhead found in each block group
3345 */
3346 for (i = 0; i < ngroups; i++) {
3347 int blks;
3348
3349 blks = count_overhead(sb, i, buf);
3350 overhead += blks;
3351 if (blks)
3352 memset(buf, 0, PAGE_SIZE);
3353 cond_resched();
3354 }
b003b524
ES		 3355 /* Add the internal journal blocks as well */
3356 if (sbi->s_journal && !sbi->journal_bdev)
810da240 3357 overhead += EXT4_NUM_B2C(sbi, sbi->s_journal->j_maxlen);
0875a2b4 3358
952fc18e
TT		 3359 sbi->s_overhead = overhead;
3360 smp_wmb();
3361 free_page((unsigned long) buf);
3362 return 0;
3363}
3364
27dd4385 3365
30fac0f7 3366static ext4_fsblk_t ext4_calculate_resv_clusters(struct super_block *sb)
27dd4385
LC		 3367{
3368 ext4_fsblk_t resv_clusters;
3369
30fac0f7
JK		 3370 /*
3371 * There's no need to reserve anything when we aren't using extents.
3372 * The space estimates are exact, there are no unwritten extents,
3373 * hole punching doesn't need new metadata... This is needed especially
3374 * to keep ext2/3 backward compatibility.
3375 */
3376 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS))
3377 return 0;
27dd4385
LC		 3378 /*
3379 * By default we reserve 2% or 4096 clusters, whichever is smaller.
3380 * This should cover the situations where we can not afford to run
3381 * out of space like for example punch hole, or converting
556615dc 3382 * unwritten extents in delalloc path. In most cases such
27dd4385
LC		 3383 * allocation would require 1, or 2 blocks, higher numbers are
3384 * very rare.
3385 */
30fac0f7
JK		 3386 resv_clusters = ext4_blocks_count(EXT4_SB(sb)->s_es) >>
3387 EXT4_SB(sb)->s_cluster_bits;
27dd4385
LC		 3388
3389 do_div(resv_clusters, 50);
3390 resv_clusters = min_t(ext4_fsblk_t, resv_clusters, 4096);
3391
3392 return resv_clusters;
3393}
3394
3395
3396static int ext4_reserve_clusters(struct ext4_sb_info *sbi, ext4_fsblk_t count)
3397{
3398 ext4_fsblk_t clusters = ext4_blocks_count(sbi->s_es) >>
3399 sbi->s_cluster_bits;
3400
3401 if (count >= clusters)
3402 return -EINVAL;
3403
3404 atomic64_set(&sbi->s_resv_clusters, count);
3405 return 0;
3406}
3407
2b2d6d01 3408static int ext4_fill_super(struct super_block *sb, void *data, int silent)
ac27a0ec 3409{
d4c402d9 3410 char *orig_data = kstrdup(data, GFP_KERNEL);
2b2d6d01 3411 struct buffer_head *bh;
617ba13b
MC		 3412 struct ext4_super_block *es = NULL;
3413 struct ext4_sb_info *sbi;
3414 ext4_fsblk_t block;
3415 ext4_fsblk_t sb_block = get_sb_block(&data);
70bbb3e0 3416 ext4_fsblk_t logical_sb_block;
ac27a0ec 3417 unsigned long offset = 0;
ac27a0ec
DK		 3418 unsigned long journal_devnum = 0;
3419 unsigned long def_mount_opts;
3420 struct inode *root;
9f6200bb 3421 char *cp;
0390131b 3422 const char *descr;
dcc7dae3 3423 int ret = -ENOMEM;
281b5995 3424 int blocksize, clustersize;
4ec11028
TT		 3425 unsigned int db_count;
3426 unsigned int i;
281b5995 3427 int needs_recovery, has_huge_files, has_bigalloc;
bd81d8ee 3428 __u64 blocks_count;
07aa2ea1 3429 int err = 0;
b3881f74 3430 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
bfff6873 3431 ext4_group_t first_not_zeroed;
ac27a0ec
DK		 3432
3433 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
3434 if (!sbi)
dcc7dae3 3435 goto out_free_orig;
705895b6
PE		 3436
3437 sbi->s_blockgroup_lock =
3438 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
3439 if (!sbi->s_blockgroup_lock) {
3440 kfree(sbi);
dcc7dae3 3441 goto out_free_orig;
705895b6 3442 }
ac27a0ec 3443 sb->s_fs_info = sbi;
2c0544b2 3444 sbi->s_sb = sb;
240799cd 3445 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
d9c9bef1 3446 sbi->s_sb_block = sb_block;
f613dfcb
TT		 3447 if (sb->s_bdev->bd_part)
3448 sbi->s_sectors_written_start =
3449 part_stat_read(sb->s_bdev->bd_part, sectors[1]);
b30ab0e0
MH		 3450#ifdef CONFIG_EXT4_FS_ENCRYPTION
3451 /* Modes of operations for file and directory encryption. */
3452 sbi->s_file_encryption_mode = EXT4_ENCRYPTION_MODE_AES_256_XTS;
3453 sbi->s_dir_encryption_mode = EXT4_ENCRYPTION_MODE_INVALID;
3454#endif
ac27a0ec 3455
9f6200bb
TT		 3456 /* Cleanup superblock name */
3457 for (cp = sb->s_id; (cp = strchr(cp, '/'));)
3458 *cp = '!';
3459
07aa2ea1 3460 /* -EINVAL is default */
dcc7dae3 3461 ret = -EINVAL;
617ba13b 3462 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
ac27a0ec 3463 if (!blocksize) {
b31e1552 3464 ext4_msg(sb, KERN_ERR, "unable to set blocksize");
ac27a0ec
DK		 3465 goto out_fail;
3466 }
3467
3468 /*
617ba13b 3469 * The ext4 superblock will not be buffer aligned for other than 1kB
ac27a0ec
DK		 3470 * block sizes. We need to calculate the offset from buffer start.
3471 */
617ba13b 3472 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
70bbb3e0
AM		 3473 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3474 offset = do_div(logical_sb_block, blocksize);
ac27a0ec 3475 } else {
70bbb3e0 3476 logical_sb_block = sb_block;
ac27a0ec
DK		 3477 }
3478
a8ac900b 3479 if (!(bh = sb_bread_unmovable(sb, logical_sb_block))) {
b31e1552 3480 ext4_msg(sb, KERN_ERR, "unable to read superblock");
ac27a0ec
DK		 3481 goto out_fail;
3482 }
3483 /*
3484 * Note: s_es must be initialized as soon as possible because
617ba13b 3485 * some ext4 macro-instructions depend on its value
ac27a0ec 3486 */
2716b802 3487 es = (struct ext4_super_block *) (bh->b_data + offset);
ac27a0ec
DK		 3488 sbi->s_es = es;
3489 sb->s_magic = le16_to_cpu(es->s_magic);
617ba13b
MC		 3490 if (sb->s_magic != EXT4_SUPER_MAGIC)
3491 goto cantfind_ext4;
afc32f7e 3492 sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
ac27a0ec 3493
feb0ab32
DW		 3494 /* Warn if metadata_csum and gdt_csum are both set. */
3495 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3496 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) &&
3497 EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_GDT_CSUM))
363307e6 3498 ext4_warning(sb, "metadata_csum and uninit_bg are "
feb0ab32
DW		 3499 "redundant flags; please run fsck.");
3500
d25425f8
DW		 3501 /* Check for a known checksum algorithm */
3502 if (!ext4_verify_csum_type(sb, es)) {
3503 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3504 "unknown checksum algorithm.");
3505 silent = 1;
3506 goto cantfind_ext4;
3507 }
3508
0441984a
DW		 3509 /* Load the checksum driver */
3510 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3511 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) {
3512 sbi->s_chksum_driver = crypto_alloc_shash("crc32c", 0, 0);
3513 if (IS_ERR(sbi->s_chksum_driver)) {
3514 ext4_msg(sb, KERN_ERR, "Cannot load crc32c driver.");
3515 ret = PTR_ERR(sbi->s_chksum_driver);
3516 sbi->s_chksum_driver = NULL;
3517 goto failed_mount;
3518 }
3519 }
3520
a9c47317
DW		 3521 /* Check superblock checksum */
3522 if (!ext4_superblock_csum_verify(sb, es)) {
3523 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3524 "invalid superblock checksum. Run e2fsck?");
3525 silent = 1;
3526 goto cantfind_ext4;
3527 }
3528
3529 /* Precompute checksum seed for all metadata */
9aa5d32b 3530 if (ext4_has_metadata_csum(sb))
a9c47317
DW		 3531 sbi->s_csum_seed = ext4_chksum(sbi, ~0, es->s_uuid,
3532 sizeof(es->s_uuid));
3533
ac27a0ec
DK		 3534 /* Set defaults before we parse the mount options */
3535 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
fd8c37ec 3536 set_opt(sb, INIT_INODE_TABLE);
617ba13b 3537 if (def_mount_opts & EXT4_DEFM_DEBUG)
fd8c37ec 3538 set_opt(sb, DEBUG);
87f26807 3539 if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
fd8c37ec 3540 set_opt(sb, GRPID);
617ba13b 3541 if (def_mount_opts & EXT4_DEFM_UID16)
fd8c37ec 3542 set_opt(sb, NO_UID32);
ea663336 3543 /* xattr user namespace & acls are now defaulted on */
ea663336 3544 set_opt(sb, XATTR_USER);
03010a33 3545#ifdef CONFIG_EXT4_FS_POSIX_ACL
ea663336 3546 set_opt(sb, POSIX_ACL);
2e7842b8 3547#endif
98c1a759
DW		 3548 /* don't forget to enable journal_csum when metadata_csum is enabled. */
3549 if (ext4_has_metadata_csum(sb))
3550 set_opt(sb, JOURNAL_CHECKSUM);
3551
617ba13b 3552 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
fd8c37ec 3553 set_opt(sb, JOURNAL_DATA);
617ba13b 3554 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
fd8c37ec 3555 set_opt(sb, ORDERED_DATA);
617ba13b 3556 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
fd8c37ec 3557 set_opt(sb, WRITEBACK_DATA);
617ba13b
MC		 3558
3559 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
fd8c37ec 3560 set_opt(sb, ERRORS_PANIC);
bb4f397a 3561 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
fd8c37ec 3562 set_opt(sb, ERRORS_CONT);
bb4f397a 3563 else
fd8c37ec 3564 set_opt(sb, ERRORS_RO);
45f1a9c3
DW		 3565 /* block_validity enabled by default; disable with noblock_validity */
3566 set_opt(sb, BLOCK_VALIDITY);
8b67f04a 3567 if (def_mount_opts & EXT4_DEFM_DISCARD)
fd8c37ec 3568 set_opt(sb, DISCARD);
ac27a0ec 3569
08cefc7a
EB		 3570 sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));
3571 sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid));
30773840
TT		 3572 sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
3573 sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
3574 sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
ac27a0ec 3575
8b67f04a 3576 if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0)
fd8c37ec 3577 set_opt(sb, BARRIER);
ac27a0ec 3578
dd919b98
AK		 3579 /*
3580 * enable delayed allocation by default
3581 * Use -o nodelalloc to turn it off
3582 */
bc0b75f7 3583 if (!IS_EXT3_SB(sb) && !IS_EXT2_SB(sb) &&
8b67f04a 3584 ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0))
fd8c37ec 3585 set_opt(sb, DELALLOC);
dd919b98 3586
51ce6511
LC		 3587 /*
3588 * set default s_li_wait_mult for lazyinit, for the case there is
3589 * no mount option specified.
3590 */
3591 sbi->s_li_wait_mult = EXT4_DEF_LI_WAIT_MULT;
3592
8b67f04a 3593 if (!parse_options((char *) sbi->s_es->s_mount_opts, sb,
661aa520 3594 &journal_devnum, &journal_ioprio, 0)) {
8b67f04a
TT		 3595 ext4_msg(sb, KERN_WARNING,
3596 "failed to parse options in superblock: %s",
3597 sbi->s_es->s_mount_opts);
3598 }
5a916be1 3599 sbi->s_def_mount_opt = sbi->s_mount_opt;
b3881f74 3600 if (!parse_options((char *) data, sb, &journal_devnum,
661aa520 3601 &journal_ioprio, 0))
ac27a0ec
DK		 3602 goto failed_mount;
3603
56889787
TT		 3604 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
3605 printk_once(KERN_WARNING "EXT4-fs: Warning: mounting "
3606 "with data=journal disables delayed "
3607 "allocation and O_DIRECT support!\n");
3608 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
3609 ext4_msg(sb, KERN_ERR, "can't mount with "
3610 "both data=journal and delalloc");
3611 goto failed_mount;
3612 }
3613 if (test_opt(sb, DIOREAD_NOLOCK)) {
3614 ext4_msg(sb, KERN_ERR, "can't mount with "
6ae6514b 3615 "both data=journal and dioread_nolock");
56889787
TT		 3616 goto failed_mount;
3617 }
923ae0ff
RZ		 3618 if (test_opt(sb, DAX)) {
3619 ext4_msg(sb, KERN_ERR, "can't mount with "
3620 "both data=journal and dax");
3621 goto failed_mount;
3622 }
56889787
TT		 3623 if (test_opt(sb, DELALLOC))
3624 clear_opt(sb, DELALLOC);
3625 }
3626
ac27a0ec 3627 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
482a7425 3628 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec 3629
617ba13b
MC		 3630 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
3631 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
3632 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
3633 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
b31e1552
ES		 3634 ext4_msg(sb, KERN_WARNING,
3635 "feature flags set on rev 0 fs, "
3636 "running e2fsck is recommended");
469108ff 3637
ed3654eb
TT		 3638 if (es->s_creator_os == cpu_to_le32(EXT4_OS_HURD)) {
3639 set_opt2(sb, HURD_COMPAT);
3640 if (EXT4_HAS_INCOMPAT_FEATURE(sb,
3641 EXT4_FEATURE_INCOMPAT_64BIT)) {
3642 ext4_msg(sb, KERN_ERR,
3643 "The Hurd can't support 64-bit file systems");
3644 goto failed_mount;
3645 }
3646 }
3647
2035e776
TT		 3648 if (IS_EXT2_SB(sb)) {
3649 if (ext2_feature_set_ok(sb))
3650 ext4_msg(sb, KERN_INFO, "mounting ext2 file system "
3651 "using the ext4 subsystem");
3652 else {
3653 ext4_msg(sb, KERN_ERR, "couldn't mount as ext2 due "
3654 "to feature incompatibilities");
3655 goto failed_mount;
3656 }
3657 }
3658
3659 if (IS_EXT3_SB(sb)) {
3660 if (ext3_feature_set_ok(sb))
3661 ext4_msg(sb, KERN_INFO, "mounting ext3 file system "
3662 "using the ext4 subsystem");
3663 else {
3664 ext4_msg(sb, KERN_ERR, "couldn't mount as ext3 due "
3665 "to feature incompatibilities");
3666 goto failed_mount;
3667 }
3668 }
3669
ac27a0ec
DK		 3670 /*
3671 * Check feature flags regardless of the revision level, since we
3672 * previously didn't change the revision level when setting the flags,
3673 * so there is a chance incompat flags are set on a rev 0 filesystem.
3674 */
a13fb1a4 3675 if (!ext4_feature_set_ok(sb, (sb->s_flags & MS_RDONLY)))
ac27a0ec 3676 goto failed_mount;
a13fb1a4 3677
261cb20c 3678 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
617ba13b
MC		 3679 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
3680 blocksize > EXT4_MAX_BLOCK_SIZE) {
b31e1552
ES		 3681 ext4_msg(sb, KERN_ERR,
3682 "Unsupported filesystem blocksize %d", blocksize);
ac27a0ec
DK		 3683 goto failed_mount;
3684 }
3685
923ae0ff
RZ		 3686 if (sbi->s_mount_opt & EXT4_MOUNT_DAX) {
3687 if (blocksize != PAGE_SIZE) {
3688 ext4_msg(sb, KERN_ERR,
3689 "error: unsupported blocksize for dax");
3690 goto failed_mount;
3691 }
3692 if (!sb->s_bdev->bd_disk->fops->direct_access) {
3693 ext4_msg(sb, KERN_ERR,
3694 "error: device does not support dax");
3695 goto failed_mount;
3696 }
3697 }
3698
6ddb2447
TT		 3699 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_ENCRYPT) &&
3700 es->s_encryption_level) {
3701 ext4_msg(sb, KERN_ERR, "Unsupported encryption level %d",
3702 es->s_encryption_level);
3703 goto failed_mount;
3704 }
3705
ac27a0ec 3706 if (sb->s_blocksize != blocksize) {
ce40733c
AK		 3707 /* Validate the filesystem blocksize */
3708 if (!sb_set_blocksize(sb, blocksize)) {
b31e1552 3709 ext4_msg(sb, KERN_ERR, "bad block size %d",
ce40733c 3710 blocksize);
ac27a0ec
DK		 3711 goto failed_mount;
3712 }
3713
2b2d6d01 3714 brelse(bh);
70bbb3e0
AM		 3715 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3716 offset = do_div(logical_sb_block, blocksize);
a8ac900b 3717 bh = sb_bread_unmovable(sb, logical_sb_block);
ac27a0ec 3718 if (!bh) {
b31e1552
ES		 3719 ext4_msg(sb, KERN_ERR,
3720 "Can't read superblock on 2nd try");
ac27a0ec
DK		 3721 goto failed_mount;
3722 }
2716b802 3723 es = (struct ext4_super_block *)(bh->b_data + offset);
ac27a0ec 3724 sbi->s_es = es;
617ba13b 3725 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
b31e1552
ES		 3726 ext4_msg(sb, KERN_ERR,
3727 "Magic mismatch, very weird!");
ac27a0ec
DK		 3728 goto failed_mount;
3729 }
3730 }
3731
a13fb1a4
ES		 3732 has_huge_files = EXT4_HAS_RO_COMPAT_FEATURE(sb,
3733 EXT4_FEATURE_RO_COMPAT_HUGE_FILE);
f287a1a5
TT		 3734 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
3735 has_huge_files);
3736 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
ac27a0ec 3737
617ba13b
MC		 3738 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
3739 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
3740 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
ac27a0ec
DK		 3741 } else {
3742 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
3743 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
617ba13b 3744 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
1330593e 3745 (!is_power_of_2(sbi->s_inode_size)) ||
ac27a0ec 3746 (sbi->s_inode_size > blocksize)) {
b31e1552
ES		 3747 ext4_msg(sb, KERN_ERR,
3748 "unsupported inode size: %d",
2b2d6d01 3749 sbi->s_inode_size);
ac27a0ec
DK		 3750 goto failed_mount;
3751 }
ef7f3835
KS		 3752 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
3753 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
ac27a0ec 3754 }
0b8e58a1 3755
0d1ee42f
AR		 3756 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
3757 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
8fadc143 3758 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
0d1ee42f 3759 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
d8ea6cf8 3760 !is_power_of_2(sbi->s_desc_size)) {
b31e1552
ES		 3761 ext4_msg(sb, KERN_ERR,
3762 "unsupported descriptor size %lu",
0d1ee42f
AR		 3763 sbi->s_desc_size);
3764 goto failed_mount;
3765 }
3766 } else
3767 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
0b8e58a1 3768
ac27a0ec 3769 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
ac27a0ec 3770 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
b47b6f38 3771 if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
617ba13b 3772 goto cantfind_ext4;
0b8e58a1 3773
617ba13b 3774 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
ac27a0ec 3775 if (sbi->s_inodes_per_block == 0)
617ba13b 3776 goto cantfind_ext4;
ac27a0ec
DK		 3777 sbi->s_itb_per_group = sbi->s_inodes_per_group /
3778 sbi->s_inodes_per_block;
0d1ee42f 3779 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
ac27a0ec
DK		 3780 sbi->s_sbh = bh;
3781 sbi->s_mount_state = le16_to_cpu(es->s_state);
e57aa839
FW		 3782 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
3783 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
0b8e58a1 3784
2b2d6d01 3785 for (i = 0; i < 4; i++)
ac27a0ec
DK		 3786 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
3787 sbi->s_def_hash_version = es->s_def_hash_version;
23301410
TT		 3788 if (EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_DIR_INDEX)) {
3789 i = le32_to_cpu(es->s_flags);
3790 if (i & EXT2_FLAGS_UNSIGNED_HASH)
3791 sbi->s_hash_unsigned = 3;
3792 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
f99b2589 3793#ifdef __CHAR_UNSIGNED__
23301410
TT		 3794 if (!(sb->s_flags & MS_RDONLY))
3795 es->s_flags |=
3796 cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
3797 sbi->s_hash_unsigned = 3;
f99b2589 3798#else
23301410
TT		 3799 if (!(sb->s_flags & MS_RDONLY))
3800 es->s_flags |=
3801 cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
f99b2589 3802#endif
23301410 3803 }
f99b2589 3804 }
ac27a0ec 3805
281b5995
TT		 3806 /* Handle clustersize */
3807 clustersize = BLOCK_SIZE << le32_to_cpu(es->s_log_cluster_size);
3808 has_bigalloc = EXT4_HAS_RO_COMPAT_FEATURE(sb,
3809 EXT4_FEATURE_RO_COMPAT_BIGALLOC);
3810 if (has_bigalloc) {
3811 if (clustersize < blocksize) {
3812 ext4_msg(sb, KERN_ERR,
3813 "cluster size (%d) smaller than "
3814 "block size (%d)", clustersize, blocksize);
3815 goto failed_mount;
3816 }
3817 sbi->s_cluster_bits = le32_to_cpu(es->s_log_cluster_size) -
3818 le32_to_cpu(es->s_log_block_size);
3819 sbi->s_clusters_per_group =
3820 le32_to_cpu(es->s_clusters_per_group);
3821 if (sbi->s_clusters_per_group > blocksize * 8) {
3822 ext4_msg(sb, KERN_ERR,
3823 "#clusters per group too big: %lu",
3824 sbi->s_clusters_per_group);
3825 goto failed_mount;
3826 }
3827 if (sbi->s_blocks_per_group !=
3828 (sbi->s_clusters_per_group * (clustersize / blocksize))) {
3829 ext4_msg(sb, KERN_ERR, "blocks per group (%lu) and "
3830 "clusters per group (%lu) inconsistent",
3831 sbi->s_blocks_per_group,
3832 sbi->s_clusters_per_group);
3833 goto failed_mount;
3834 }
3835 } else {
3836 if (clustersize != blocksize) {
3837 ext4_warning(sb, "fragment/cluster size (%d) != "
3838 "block size (%d)", clustersize,
3839 blocksize);
3840 clustersize = blocksize;
3841 }
3842 if (sbi->s_blocks_per_group > blocksize * 8) {
3843 ext4_msg(sb, KERN_ERR,
3844 "#blocks per group too big: %lu",
3845 sbi->s_blocks_per_group);
3846 goto failed_mount;
3847 }
3848 sbi->s_clusters_per_group = sbi->s_blocks_per_group;
3849 sbi->s_cluster_bits = 0;
ac27a0ec 3850 }
281b5995
TT		 3851 sbi->s_cluster_ratio = clustersize / blocksize;
3852
ac27a0ec 3853 if (sbi->s_inodes_per_group > blocksize * 8) {
b31e1552
ES		 3854 ext4_msg(sb, KERN_ERR,
3855 "#inodes per group too big: %lu",
2b2d6d01 3856 sbi->s_inodes_per_group);
ac27a0ec
DK		 3857 goto failed_mount;
3858 }
3859
960fd856
TT		 3860 /* Do we have standard group size of clustersize * 8 blocks ? */
3861 if (sbi->s_blocks_per_group == clustersize << 3)
3862 set_opt2(sb, STD_GROUP_SIZE);
3863
bf43d84b
ES		 3864 /*
3865 * Test whether we have more sectors than will fit in sector_t,
3866 * and whether the max offset is addressable by the page cache.
3867 */
5a9ae68a 3868 err = generic_check_addressable(sb->s_blocksize_bits,
30ca22c7 3869 ext4_blocks_count(es));
5a9ae68a 3870 if (err) {
b31e1552 3871 ext4_msg(sb, KERN_ERR, "filesystem"
bf43d84b 3872 " too large to mount safely on this system");
ac27a0ec 3873 if (sizeof(sector_t) < 8)
90c699a9 3874 ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled");
ac27a0ec
DK		 3875 goto failed_mount;
3876 }
3877
617ba13b
MC		 3878 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
3879 goto cantfind_ext4;
e7c95593 3880
0f2ddca6
FTN		 3881 /* check blocks count against device size */
3882 blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
3883 if (blocks_count && ext4_blocks_count(es) > blocks_count) {
b31e1552
ES		 3884 ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
3885 "exceeds size of device (%llu blocks)",
0f2ddca6
FTN		 3886 ext4_blocks_count(es), blocks_count);
3887 goto failed_mount;
3888 }
3889
0b8e58a1
AD		 3890 /*
3891 * It makes no sense for the first data block to be beyond the end
3892 * of the filesystem.
3893 */
3894 if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
5635a62b 3895 ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
b31e1552
ES		 3896 "block %u is beyond end of filesystem (%llu)",
3897 le32_to_cpu(es->s_first_data_block),
3898 ext4_blocks_count(es));
e7c95593
ES		 3899 goto failed_mount;
3900 }
bd81d8ee
LV		 3901 blocks_count = (ext4_blocks_count(es) -
3902 le32_to_cpu(es->s_first_data_block) +
3903 EXT4_BLOCKS_PER_GROUP(sb) - 1);
3904 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
4ec11028 3905 if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
b31e1552 3906 ext4_msg(sb, KERN_WARNING, "groups count too large: %u "
4ec11028 3907 "(block count %llu, first data block %u, "
b31e1552 3908 "blocks per group %lu)", sbi->s_groups_count,
4ec11028
TT		 3909 ext4_blocks_count(es),
3910 le32_to_cpu(es->s_first_data_block),
3911 EXT4_BLOCKS_PER_GROUP(sb));
3912 goto failed_mount;
3913 }
bd81d8ee 3914 sbi->s_groups_count = blocks_count;
fb0a387d
ES		 3915 sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
3916 (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
617ba13b
MC		 3917 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
3918 EXT4_DESC_PER_BLOCK(sb);
f18a5f21
TT		 3919 sbi->s_group_desc = ext4_kvmalloc(db_count *
3920 sizeof(struct buffer_head *),
3921 GFP_KERNEL);
ac27a0ec 3922 if (sbi->s_group_desc == NULL) {
b31e1552 3923 ext4_msg(sb, KERN_ERR, "not enough memory");
2cde417d 3924 ret = -ENOMEM;
ac27a0ec
DK		 3925 goto failed_mount;
3926 }
3927
9f6200bb
TT		 3928 if (ext4_proc_root)
3929 sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);
240799cd 3930
66acdcf4
TT		 3931 if (sbi->s_proc)
3932 proc_create_data("options", S_IRUGO, sbi->s_proc,
3933 &ext4_seq_options_fops, sb);
3934
705895b6 3935 bgl_lock_init(sbi->s_blockgroup_lock);
ac27a0ec
DK		 3936
3937 for (i = 0; i < db_count; i++) {
70bbb3e0 3938 block = descriptor_loc(sb, logical_sb_block, i);
a8ac900b 3939 sbi->s_group_desc[i] = sb_bread_unmovable(sb, block);
ac27a0ec 3940 if (!sbi->s_group_desc[i]) {
b31e1552
ES		 3941 ext4_msg(sb, KERN_ERR,
3942 "can't read group descriptor %d", i);
ac27a0ec
DK		 3943 db_count = i;
3944 goto failed_mount2;
3945 }
3946 }
bfff6873 3947 if (!ext4_check_descriptors(sb, &first_not_zeroed)) {
b31e1552 3948 ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
f9ae9cf5 3949 goto failed_mount2;
ac27a0ec 3950 }
772cb7c8 3951
f9ae9cf5 3952 sbi->s_gdb_count = db_count;
ac27a0ec
DK		 3953 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
3954 spin_lock_init(&sbi->s_next_gen_lock);
3955
04ecddb7
JM		 3956 setup_timer(&sbi->s_err_report, print_daily_error_info,
3957 (unsigned long) sb);
04496411 3958
a75ae78f 3959 /* Register extent status tree shrinker */
eb68d0e2 3960 if (ext4_es_register_shrinker(sbi))
ce7e010a 3961 goto failed_mount3;
ce7e010a 3962
c9de560d 3963 sbi->s_stripe = ext4_get_stripe_size(sbi);
67a5da56 3964 sbi->s_extent_max_zeroout_kb = 32;
c9de560d 3965
f9ae9cf5
TT		 3966 /*
3967 * set up enough so that it can read an inode
3968 */
f6e63f90 3969 sb->s_op = &ext4_sops;
617ba13b
MC		 3970 sb->s_export_op = &ext4_export_ops;
3971 sb->s_xattr = ext4_xattr_handlers;
ac27a0ec 3972#ifdef CONFIG_QUOTA
617ba13b 3973 sb->dq_op = &ext4_quota_operations;
262b4662 3974 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA))
1fa5efe3 3975 sb->s_qcop = &dquot_quotactl_sysfile_ops;
262b4662
JK		 3976 else
3977 sb->s_qcop = &ext4_qctl_operations;
96c7e0d9 3978 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
ac27a0ec 3979#endif
f2fa2ffc
AK		 3980 memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
3981
ac27a0ec 3982 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
3b9d4ed2 3983 mutex_init(&sbi->s_orphan_lock);
ac27a0ec
DK		 3984
3985 sb->s_root = NULL;
3986
3987 needs_recovery = (es->s_last_orphan != 0 ||
617ba13b
MC		 3988 EXT4_HAS_INCOMPAT_FEATURE(sb,
3989 EXT4_FEATURE_INCOMPAT_RECOVER));
ac27a0ec 3990
c5e06d10
JL		 3991 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_MMP) &&
3992 !(sb->s_flags & MS_RDONLY))
3993 if (ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block)))
50460fe8 3994 goto failed_mount3a;
c5e06d10 3995
ac27a0ec
DK		 3996 /*
3997 * The first inode we look at is the journal inode. Don't try
3998 * root first: it may be modified in the journal!
3999 */
4000 if (!test_opt(sb, NOLOAD) &&
617ba13b
MC		 4001 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
4002 if (ext4_load_journal(sb, es, journal_devnum))
50460fe8 4003 goto failed_mount3a;
0390131b
FM		 4004 } else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) &&
4005 EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
b31e1552
ES		 4006 ext4_msg(sb, KERN_ERR, "required journal recovery "
4007 "suppressed and not mounted read-only");
744692dc 4008 goto failed_mount_wq;
ac27a0ec 4009 } else {
fd8c37ec 4010 clear_opt(sb, DATA_FLAGS);
0390131b
FM		 4011 sbi->s_journal = NULL;
4012 needs_recovery = 0;
4013 goto no_journal;
ac27a0ec
DK		 4014 }
4015
f32aaf2d 4016 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT) &&
eb40a09c
JS		 4017 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
4018 JBD2_FEATURE_INCOMPAT_64BIT)) {
b31e1552 4019 ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
744692dc 4020 goto failed_mount_wq;
eb40a09c
JS		 4021 }
4022
25ed6e8a
DW		 4023 if (!set_journal_csum_feature_set(sb)) {
4024 ext4_msg(sb, KERN_ERR, "Failed to set journal checksum "
4025 "feature set");
4026 goto failed_mount_wq;
d4da6c9c 4027 }
818d276c 4028
ac27a0ec
DK		 4029 /* We have now updated the journal if required, so we can
4030 * validate the data journaling mode. */
4031 switch (test_opt(sb, DATA_FLAGS)) {
4032 case 0:
4033 /* No mode set, assume a default based on the journal
63f57933
AM		 4034 * capabilities: ORDERED_DATA if the journal can
4035 * cope, else JOURNAL_DATA
4036 */
dab291af
MC		 4037 if (jbd2_journal_check_available_features
4038 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
fd8c37ec 4039 set_opt(sb, ORDERED_DATA);
ac27a0ec 4040 else
fd8c37ec 4041 set_opt(sb, JOURNAL_DATA);
ac27a0ec
DK		 4042 break;
4043
617ba13b
MC		 4044 case EXT4_MOUNT_ORDERED_DATA:
4045 case EXT4_MOUNT_WRITEBACK_DATA:
dab291af
MC		 4046 if (!jbd2_journal_check_available_features
4047 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
b31e1552
ES		 4048 ext4_msg(sb, KERN_ERR, "Journal does not support "
4049 "requested data journaling mode");
744692dc 4050 goto failed_mount_wq;
ac27a0ec
DK		 4051 }
4052 default:
4053 break;
4054 }
b3881f74 4055 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
ac27a0ec 4056
18aadd47
BJ		 4057 sbi->s_journal->j_commit_callback = ext4_journal_commit_callback;
4058
ce7e010a 4059no_journal:
9c191f70
M		 4060 if (ext4_mballoc_ready) {
4061 sbi->s_mb_cache = ext4_xattr_create_cache(sb->s_id);
4062 if (!sbi->s_mb_cache) {
4063 ext4_msg(sb, KERN_ERR, "Failed to create an mb_cache");
4064 goto failed_mount_wq;
4065 }
4066 }
4067
6ddb2447
TT		 4068 if (unlikely(sbi->s_mount_flags & EXT4_MF_TEST_DUMMY_ENCRYPTION) &&
4069 !(sb->s_flags & MS_RDONLY) &&
4070 !EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_ENCRYPT)) {
4071 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_ENCRYPT);
4072 ext4_commit_super(sb, 1);
4073 }
4074
952fc18e
TT		 4075 /*
4076 * Get the # of file system overhead blocks from the
4077 * superblock if present.
4078 */
4079 if (es->s_overhead_clusters)
4080 sbi->s_overhead = le32_to_cpu(es->s_overhead_clusters);
4081 else {
07aa2ea1
LC		 4082 err = ext4_calculate_overhead(sb);
4083 if (err)
952fc18e
TT		 4084 goto failed_mount_wq;
4085 }
4086
fd89d5f2
TH		 4087 /*
4088 * The maximum number of concurrent works can be high and
4089 * concurrency isn't really necessary. Limit it to 1.
4090 */
2e8fa54e
JK		 4091 EXT4_SB(sb)->rsv_conversion_wq =
4092 alloc_workqueue("ext4-rsv-conversion", WQ_MEM_RECLAIM | WQ_UNBOUND, 1);
4093 if (!EXT4_SB(sb)->rsv_conversion_wq) {
4094 printk(KERN_ERR "EXT4-fs: failed to create workqueue\n");
07aa2ea1 4095 ret = -ENOMEM;
2e8fa54e
JK		 4096 goto failed_mount4;
4097 }
4098
ac27a0ec 4099 /*
dab291af 4100 * The jbd2_journal_load will have done any necessary log recovery,
ac27a0ec
DK		 4101 * so we can safely mount the rest of the filesystem now.
4102 */
4103
1d1fe1ee
DH		 4104 root = ext4_iget(sb, EXT4_ROOT_INO);
4105 if (IS_ERR(root)) {
b31e1552 4106 ext4_msg(sb, KERN_ERR, "get root inode failed");
1d1fe1ee 4107 ret = PTR_ERR(root);
32a9bb57 4108 root = NULL;
ac27a0ec
DK		 4109 goto failed_mount4;
4110 }
4111 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
b31e1552 4112 ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
94bf608a 4113 iput(root);
ac27a0ec
DK		 4114 goto failed_mount4;
4115 }
48fde701 4116 sb->s_root = d_make_root(root);
1d1fe1ee 4117 if (!sb->s_root) {
b31e1552 4118 ext4_msg(sb, KERN_ERR, "get root dentry failed");
1d1fe1ee
DH		 4119 ret = -ENOMEM;
4120 goto failed_mount4;
4121 }
ac27a0ec 4122
7e84b621
ES		 4123 if (ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY))
4124 sb->s_flags |= MS_RDONLY;
ef7f3835
KS		 4125
4126 /* determine the minimum size of new large inodes, if present */
4127 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
4128 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
4129 EXT4_GOOD_OLD_INODE_SIZE;
4130 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
4131 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) {
4132 if (sbi->s_want_extra_isize <
4133 le16_to_cpu(es->s_want_extra_isize))
4134 sbi->s_want_extra_isize =
4135 le16_to_cpu(es->s_want_extra_isize);
4136 if (sbi->s_want_extra_isize <
4137 le16_to_cpu(es->s_min_extra_isize))
4138 sbi->s_want_extra_isize =
4139 le16_to_cpu(es->s_min_extra_isize);
4140 }
4141 }
4142 /* Check if enough inode space is available */
4143 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
4144 sbi->s_inode_size) {
4145 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
4146 EXT4_GOOD_OLD_INODE_SIZE;
b31e1552
ES		 4147 ext4_msg(sb, KERN_INFO, "required extra inode space not"
4148 "available");
ef7f3835
KS		 4149 }
4150
30fac0f7 4151 err = ext4_reserve_clusters(sbi, ext4_calculate_resv_clusters(sb));
27dd4385
LC		 4152 if (err) {
4153 ext4_msg(sb, KERN_ERR, "failed to reserve %llu clusters for "
30fac0f7 4154 "reserved pool", ext4_calculate_resv_clusters(sb));
f9ae9cf5 4155 goto failed_mount4a;
27dd4385
LC		 4156 }
4157
6fd058f7
TT		 4158 err = ext4_setup_system_zone(sb);
4159 if (err) {
b31e1552 4160 ext4_msg(sb, KERN_ERR, "failed to initialize system "
fbe845dd 4161 "zone (%d)", err);
f9ae9cf5
TT		 4162 goto failed_mount4a;
4163 }
4164
4165 ext4_ext_init(sb);
4166 err = ext4_mb_init(sb);
4167 if (err) {
4168 ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)",
4169 err);
dcf2d804 4170 goto failed_mount5;
c2774d84
AK		 4171 }
4172
d5e03cbb
TT		 4173 block = ext4_count_free_clusters(sb);
4174 ext4_free_blocks_count_set(sbi->s_es,
4175 EXT4_C2B(sbi, block));
908c7f19
TH		 4176 err = percpu_counter_init(&sbi->s_freeclusters_counter, block,
4177 GFP_KERNEL);
d5e03cbb
TT		 4178 if (!err) {
4179 unsigned long freei = ext4_count_free_inodes(sb);
4180 sbi->s_es->s_free_inodes_count = cpu_to_le32(freei);
908c7f19
TH		 4181 err = percpu_counter_init(&sbi->s_freeinodes_counter, freei,
4182 GFP_KERNEL);
d5e03cbb
TT		 4183 }
4184 if (!err)
4185 err = percpu_counter_init(&sbi->s_dirs_counter,
908c7f19 4186 ext4_count_dirs(sb), GFP_KERNEL);
d5e03cbb 4187 if (!err)
908c7f19
TH		 4188 err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0,
4189 GFP_KERNEL);
d5e03cbb
TT		 4190 if (err) {
4191 ext4_msg(sb, KERN_ERR, "insufficient memory");
4192 goto failed_mount6;
4193 }
4194
4195 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
4196 if (!ext4_fill_flex_info(sb)) {
4197 ext4_msg(sb, KERN_ERR,
4198 "unable to initialize "
4199 "flex_bg meta info!");
4200 goto failed_mount6;
4201 }
4202
bfff6873
LC		 4203 err = ext4_register_li_request(sb, first_not_zeroed);
4204 if (err)
dcf2d804 4205 goto failed_mount6;
bfff6873 4206
3197ebdb
TT		 4207 sbi->s_kobj.kset = ext4_kset;
4208 init_completion(&sbi->s_kobj_unregister);
4209 err = kobject_init_and_add(&sbi->s_kobj, &ext4_ktype, NULL,
4210 "%s", sb->s_id);
dcf2d804
TM		 4211 if (err)
4212 goto failed_mount7;
3197ebdb 4213
9b2ff357
JK		 4214#ifdef CONFIG_QUOTA
4215 /* Enable quota usage during mount. */
4216 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) &&
4217 !(sb->s_flags & MS_RDONLY)) {
4218 err = ext4_enable_quotas(sb);
4219 if (err)
4220 goto failed_mount8;
4221 }
4222#endif /* CONFIG_QUOTA */
4223
617ba13b
MC		 4224 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
4225 ext4_orphan_cleanup(sb, es);
4226 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
0390131b 4227 if (needs_recovery) {
b31e1552 4228 ext4_msg(sb, KERN_INFO, "recovery complete");
0390131b
FM		 4229 ext4_mark_recovery_complete(sb, es);
4230 }
4231 if (EXT4_SB(sb)->s_journal) {
4232 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
4233 descr = " journalled data mode";
4234 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
4235 descr = " ordered data mode";
4236 else
4237 descr = " writeback data mode";
4238 } else
4239 descr = "out journal";
4240
79add3a3
LC		 4241 if (test_opt(sb, DISCARD)) {
4242 struct request_queue *q = bdev_get_queue(sb->s_bdev);
4243 if (!blk_queue_discard(q))
4244 ext4_msg(sb, KERN_WARNING,
4245 "mounting with \"discard\" option, but "
4246 "the device does not support discard");
4247 }
4248
d4c402d9 4249 ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. "
8b67f04a
TT		 4250 "Opts: %s%s%s", descr, sbi->s_es->s_mount_opts,
4251 *sbi->s_es->s_mount_opts ? "; " : "", orig_data);
ac27a0ec 4252
66e61a9e
TT		 4253 if (es->s_error_count)
4254 mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */
ac27a0ec 4255
efbed4dc
TT		 4256 /* Enable message ratelimiting. Default is 10 messages per 5 secs. */
4257 ratelimit_state_init(&sbi->s_err_ratelimit_state, 5 * HZ, 10);
4258 ratelimit_state_init(&sbi->s_warning_ratelimit_state, 5 * HZ, 10);
4259 ratelimit_state_init(&sbi->s_msg_ratelimit_state, 5 * HZ, 10);
4260
d4c402d9 4261 kfree(orig_data);
ac27a0ec
DK		 4262 return 0;
4263
617ba13b 4264cantfind_ext4:
ac27a0ec 4265 if (!silent)
b31e1552 4266 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
ac27a0ec
DK		 4267 goto failed_mount;
4268
72ba7450
TT		 4269#ifdef CONFIG_QUOTA
4270failed_mount8:
4271 kobject_del(&sbi->s_kobj);
4272#endif
dcf2d804
TM		 4273failed_mount7:
4274 ext4_unregister_li_request(sb);
4275failed_mount6:
f9ae9cf5 4276 ext4_mb_release(sb);
d5e03cbb 4277 if (sbi->s_flex_groups)
b93b41d4 4278 kvfree(sbi->s_flex_groups);
d5e03cbb
TT		 4279 percpu_counter_destroy(&sbi->s_freeclusters_counter);
4280 percpu_counter_destroy(&sbi->s_freeinodes_counter);
4281 percpu_counter_destroy(&sbi->s_dirs_counter);
4282 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
00764937 4283failed_mount5:
f9ae9cf5
TT		 4284 ext4_ext_release(sb);
4285 ext4_release_system_zone(sb);
4286failed_mount4a:
94bf608a 4287 dput(sb->s_root);
32a9bb57 4288 sb->s_root = NULL;
94bf608a 4289failed_mount4:
b31e1552 4290 ext4_msg(sb, KERN_ERR, "mount failed");
2e8fa54e
JK		 4291 if (EXT4_SB(sb)->rsv_conversion_wq)
4292 destroy_workqueue(EXT4_SB(sb)->rsv_conversion_wq);
4c0425ff 4293failed_mount_wq:
0390131b
FM		 4294 if (sbi->s_journal) {
4295 jbd2_journal_destroy(sbi->s_journal);
4296 sbi->s_journal = NULL;
4297 }
50460fe8 4298failed_mount3a:
d3922a77 4299 ext4_es_unregister_shrinker(sbi);
eb68d0e2 4300failed_mount3:
9105bb14 4301 del_timer_sync(&sbi->s_err_report);
c5e06d10
JL		 4302 if (sbi->s_mmp_tsk)
4303 kthread_stop(sbi->s_mmp_tsk);
ac27a0ec
DK		 4304failed_mount2:
4305 for (i = 0; i < db_count; i++)
4306 brelse(sbi->s_group_desc[i]);
b93b41d4 4307 kvfree(sbi->s_group_desc);
ac27a0ec 4308failed_mount:
0441984a
DW		 4309 if (sbi->s_chksum_driver)
4310 crypto_free_shash(sbi->s_chksum_driver);
240799cd 4311 if (sbi->s_proc) {
66acdcf4 4312 remove_proc_entry("options", sbi->s_proc);
9f6200bb 4313 remove_proc_entry(sb->s_id, ext4_proc_root);
240799cd 4314 }
ac27a0ec 4315#ifdef CONFIG_QUOTA
a2d4a646 4316 for (i = 0; i < EXT4_MAXQUOTAS; i++)
ac27a0ec
DK		 4317 kfree(sbi->s_qf_names[i]);
4318#endif
617ba13b 4319 ext4_blkdev_remove(sbi);
ac27a0ec
DK		 4320 brelse(bh);
4321out_fail:
4322 sb->s_fs_info = NULL;
f6830165 4323 kfree(sbi->s_blockgroup_lock);
ac27a0ec 4324 kfree(sbi);
dcc7dae3 4325out_free_orig:
d4c402d9 4326 kfree(orig_data);
07aa2ea1 4327 return err ? err : ret;
ac27a0ec
DK		 4328}
4329
4330/*
4331 * Setup any per-fs journal parameters now. We'll do this both on
4332 * initial mount, once the journal has been initialised but before we've
4333 * done any recovery; and again on any subsequent remount.
4334 */
617ba13b 4335static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
ac27a0ec 4336{
617ba13b 4337 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4338
30773840
TT		 4339 journal->j_commit_interval = sbi->s_commit_interval;
4340 journal->j_min_batch_time = sbi->s_min_batch_time;
4341 journal->j_max_batch_time = sbi->s_max_batch_time;
ac27a0ec 4342
a931da6a 4343 write_lock(&journal->j_state_lock);
ac27a0ec 4344 if (test_opt(sb, BARRIER))
dab291af 4345 journal->j_flags |= JBD2_BARRIER;
ac27a0ec 4346 else
dab291af 4347 journal->j_flags &= ~JBD2_BARRIER;
5bf5683a
HK		 4348 if (test_opt(sb, DATA_ERR_ABORT))
4349 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
4350 else
4351 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
a931da6a 4352 write_unlock(&journal->j_state_lock);
ac27a0ec
DK		 4353}
4354
617ba13b 4355static journal_t *ext4_get_journal(struct super_block *sb,
ac27a0ec
DK		 4356 unsigned int journal_inum)
4357{
4358 struct inode *journal_inode;
4359 journal_t *journal;
4360
0390131b
FM		 4361 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4362
ac27a0ec
DK		 4363 /* First, test for the existence of a valid inode on disk. Bad
4364 * things happen if we iget() an unused inode, as the subsequent
4365 * iput() will try to delete it. */
4366
1d1fe1ee
DH		 4367 journal_inode = ext4_iget(sb, journal_inum);
4368 if (IS_ERR(journal_inode)) {
b31e1552 4369 ext4_msg(sb, KERN_ERR, "no journal found");
ac27a0ec
DK		 4370 return NULL;
4371 }
4372 if (!journal_inode->i_nlink) {
4373 make_bad_inode(journal_inode);
4374 iput(journal_inode);
b31e1552 4375 ext4_msg(sb, KERN_ERR, "journal inode is deleted");
ac27a0ec
DK		 4376 return NULL;
4377 }
4378
e5f8eab8 4379 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
ac27a0ec 4380 journal_inode, journal_inode->i_size);
1d1fe1ee 4381 if (!S_ISREG(journal_inode->i_mode)) {
b31e1552 4382 ext4_msg(sb, KERN_ERR, "invalid journal inode");
ac27a0ec
DK		 4383 iput(journal_inode);
4384 return NULL;
4385 }
4386
dab291af 4387 journal = jbd2_journal_init_inode(journal_inode);
ac27a0ec 4388 if (!journal) {
b31e1552 4389 ext4_msg(sb, KERN_ERR, "Could not load journal inode");
ac27a0ec
DK		 4390 iput(journal_inode);
4391 return NULL;
4392 }
4393 journal->j_private = sb;
617ba13b 4394 ext4_init_journal_params(sb, journal);
ac27a0ec
DK		 4395 return journal;
4396}
4397
617ba13b 4398static journal_t *ext4_get_dev_journal(struct super_block *sb,
ac27a0ec
DK		 4399 dev_t j_dev)
4400{
2b2d6d01 4401 struct buffer_head *bh;
ac27a0ec 4402 journal_t *journal;
617ba13b
MC		 4403 ext4_fsblk_t start;
4404 ext4_fsblk_t len;
ac27a0ec 4405 int hblock, blocksize;
617ba13b 4406 ext4_fsblk_t sb_block;
ac27a0ec 4407 unsigned long offset;
2b2d6d01 4408 struct ext4_super_block *es;
ac27a0ec
DK		 4409 struct block_device *bdev;
4410
0390131b
FM		 4411 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4412
b31e1552 4413 bdev = ext4_blkdev_get(j_dev, sb);
ac27a0ec
DK		 4414 if (bdev == NULL)
4415 return NULL;
4416
ac27a0ec 4417 blocksize = sb->s_blocksize;
e1defc4f 4418 hblock = bdev_logical_block_size(bdev);
ac27a0ec 4419 if (blocksize < hblock) {
b31e1552
ES		 4420 ext4_msg(sb, KERN_ERR,
4421 "blocksize too small for journal device");
ac27a0ec
DK		 4422 goto out_bdev;
4423 }
4424
617ba13b
MC		 4425 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
4426 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
ac27a0ec
DK		 4427 set_blocksize(bdev, blocksize);
4428 if (!(bh = __bread(bdev, sb_block, blocksize))) {
b31e1552
ES		 4429 ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
4430 "external journal");
ac27a0ec
DK		 4431 goto out_bdev;
4432 }
4433
2716b802 4434 es = (struct ext4_super_block *) (bh->b_data + offset);
617ba13b 4435 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
ac27a0ec 4436 !(le32_to_cpu(es->s_feature_incompat) &
617ba13b 4437 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
b31e1552
ES		 4438 ext4_msg(sb, KERN_ERR, "external journal has "
4439 "bad superblock");
ac27a0ec
DK		 4440 brelse(bh);
4441 goto out_bdev;
4442 }
4443
df4763be
DW		 4444 if ((le32_to_cpu(es->s_feature_ro_compat) &
4445 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) &&
4446 es->s_checksum != ext4_superblock_csum(sb, es)) {
4447 ext4_msg(sb, KERN_ERR, "external journal has "
4448 "corrupt superblock");
4449 brelse(bh);
4450 goto out_bdev;
4451 }
4452
617ba13b 4453 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
b31e1552 4454 ext4_msg(sb, KERN_ERR, "journal UUID does not match");
ac27a0ec
DK		 4455 brelse(bh);
4456 goto out_bdev;
4457 }
4458
bd81d8ee 4459 len = ext4_blocks_count(es);
ac27a0ec
DK		 4460 start = sb_block + 1;
4461 brelse(bh); /* we're done with the superblock */
4462
dab291af 4463 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
ac27a0ec
DK		 4464 start, len, blocksize);
4465 if (!journal) {
b31e1552 4466 ext4_msg(sb, KERN_ERR, "failed to create device journal");
ac27a0ec
DK		 4467 goto out_bdev;
4468 }
4469 journal->j_private = sb;
9f203507 4470 ll_rw_block(READ | REQ_META | REQ_PRIO, 1, &journal->j_sb_buffer);
ac27a0ec
DK		 4471 wait_on_buffer(journal->j_sb_buffer);
4472 if (!buffer_uptodate(journal->j_sb_buffer)) {
b31e1552 4473 ext4_msg(sb, KERN_ERR, "I/O error on journal device");
ac27a0ec
DK		 4474 goto out_journal;
4475 }
4476 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
b31e1552
ES		 4477 ext4_msg(sb, KERN_ERR, "External journal has more than one "
4478 "user (unsupported) - %d",
ac27a0ec
DK		 4479 be32_to_cpu(journal->j_superblock->s_nr_users));
4480 goto out_journal;
4481 }
617ba13b
MC		 4482 EXT4_SB(sb)->journal_bdev = bdev;
4483 ext4_init_journal_params(sb, journal);
ac27a0ec 4484 return journal;
0b8e58a1 4485
ac27a0ec 4486out_journal:
dab291af 4487 jbd2_journal_destroy(journal);
ac27a0ec 4488out_bdev:
617ba13b 4489 ext4_blkdev_put(bdev);
ac27a0ec
DK		 4490 return NULL;
4491}
4492
617ba13b
MC		 4493static int ext4_load_journal(struct super_block *sb,
4494 struct ext4_super_block *es,
ac27a0ec
DK		 4495 unsigned long journal_devnum)
4496{
4497 journal_t *journal;
4498 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
4499 dev_t journal_dev;
4500 int err = 0;
4501 int really_read_only;
4502
0390131b
FM		 4503 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4504
ac27a0ec
DK		 4505 if (journal_devnum &&
4506 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
b31e1552
ES		 4507 ext4_msg(sb, KERN_INFO, "external journal device major/minor "
4508 "numbers have changed");
ac27a0ec
DK		 4509 journal_dev = new_decode_dev(journal_devnum);
4510 } else
4511 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
4512
4513 really_read_only = bdev_read_only(sb->s_bdev);
4514
4515 /*
4516 * Are we loading a blank journal or performing recovery after a
4517 * crash? For recovery, we need to check in advance whether we
4518 * can get read-write access to the device.
4519 */
617ba13b 4520 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
ac27a0ec 4521 if (sb->s_flags & MS_RDONLY) {
b31e1552
ES		 4522 ext4_msg(sb, KERN_INFO, "INFO: recovery "
4523 "required on readonly filesystem");
ac27a0ec 4524 if (really_read_only) {
b31e1552
ES		 4525 ext4_msg(sb, KERN_ERR, "write access "
4526 "unavailable, cannot proceed");
ac27a0ec
DK		 4527 return -EROFS;
4528 }
b31e1552
ES		 4529 ext4_msg(sb, KERN_INFO, "write access will "
4530 "be enabled during recovery");
ac27a0ec
DK		 4531 }
4532 }
4533
4534 if (journal_inum && journal_dev) {
b31e1552
ES		 4535 ext4_msg(sb, KERN_ERR, "filesystem has both journal "
4536 "and inode journals!");
ac27a0ec
DK		 4537 return -EINVAL;
4538 }
4539
4540 if (journal_inum) {
617ba13b 4541 if (!(journal = ext4_get_journal(sb, journal_inum)))
ac27a0ec
DK		 4542 return -EINVAL;
4543 } else {
617ba13b 4544 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
ac27a0ec
DK		 4545 return -EINVAL;
4546 }
4547
90576c0b 4548 if (!(journal->j_flags & JBD2_BARRIER))
b31e1552 4549 ext4_msg(sb, KERN_INFO, "barriers disabled");
4776004f 4550
617ba13b 4551 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
dab291af 4552 err = jbd2_journal_wipe(journal, !really_read_only);
1c13d5c0
TT		 4553 if (!err) {
4554 char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL);
4555 if (save)
4556 memcpy(save, ((char *) es) +
4557 EXT4_S_ERR_START, EXT4_S_ERR_LEN);
dab291af 4558 err = jbd2_journal_load(journal);
1c13d5c0
TT		 4559 if (save)
4560 memcpy(((char *) es) + EXT4_S_ERR_START,
4561 save, EXT4_S_ERR_LEN);
4562 kfree(save);
4563 }
ac27a0ec
DK		 4564
4565 if (err) {
b31e1552 4566 ext4_msg(sb, KERN_ERR, "error loading journal");
dab291af 4567 jbd2_journal_destroy(journal);
ac27a0ec
DK		 4568 return err;
4569 }
4570
617ba13b
MC		 4571 EXT4_SB(sb)->s_journal = journal;
4572 ext4_clear_journal_err(sb, es);
ac27a0ec 4573
c41303ce 4574 if (!really_read_only && journal_devnum &&
ac27a0ec
DK		 4575 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
4576 es->s_journal_dev = cpu_to_le32(journal_devnum);
ac27a0ec
DK		 4577
4578 /* Make sure we flush the recovery flag to disk. */
e2d67052 4579 ext4_commit_super(sb, 1);
ac27a0ec
DK		 4580 }
4581
4582 return 0;
4583}
4584
e2d67052 4585static int ext4_commit_super(struct super_block *sb, int sync)
ac27a0ec 4586{
e2d67052 4587 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
617ba13b 4588 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
c4be0c1d 4589 int error = 0;
ac27a0ec 4590
08439fec 4591 if (!sbh)
c4be0c1d 4592 return error;
914258bf
TT		 4593 if (buffer_write_io_error(sbh)) {
4594 /*
4595 * Oh, dear. A previous attempt to write the
4596 * superblock failed. This could happen because the
4597 * USB device was yanked out. Or it could happen to
4598 * be a transient write error and maybe the block will
4599 * be remapped. Nothing we can do but to retry the
4600 * write and hope for the best.
4601 */
b31e1552
ES		 4602 ext4_msg(sb, KERN_ERR, "previous I/O error to "
4603 "superblock detected");
914258bf
TT		 4604 clear_buffer_write_io_error(sbh);
4605 set_buffer_uptodate(sbh);
4606 }
71290b36
TT		 4607 /*
4608 * If the file system is mounted read-only, don't update the
4609 * superblock write time. This avoids updating the superblock
4610 * write time when we are mounting the root file system
4611 * read/only but we need to replay the journal; at that point,
4612 * for people who are east of GMT and who make their clock
4613 * tick in localtime for Windows bug-for-bug compatibility,
4614 * the clock is set in the future, and this will cause e2fsck
4615 * to complain and force a full file system check.
4616 */
4617 if (!(sb->s_flags & MS_RDONLY))
4618 es->s_wtime = cpu_to_le32(get_seconds());
f613dfcb
TT		 4619 if (sb->s_bdev->bd_part)
4620 es->s_kbytes_written =
4621 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written +
afc32f7e
TT		 4622 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
4623 EXT4_SB(sb)->s_sectors_written_start) >> 1));
f613dfcb
TT		 4624 else
4625 es->s_kbytes_written =
4626 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written);
d5e03cbb
TT		 4627 if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeclusters_counter))
4628 ext4_free_blocks_count_set(es,
57042651
TT		 4629 EXT4_C2B(EXT4_SB(sb), percpu_counter_sum_positive(
4630 &EXT4_SB(sb)->s_freeclusters_counter)));
d5e03cbb
TT		 4631 if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeinodes_counter))
4632 es->s_free_inodes_count =
4633 cpu_to_le32(percpu_counter_sum_positive(
ce7e010a 4634 &EXT4_SB(sb)->s_freeinodes_counter));
ac27a0ec 4635 BUFFER_TRACE(sbh, "marking dirty");
06db49e6 4636 ext4_superblock_csum_set(sb);
ac27a0ec 4637 mark_buffer_dirty(sbh);
914258bf 4638 if (sync) {
c4be0c1d
TS		 4639 error = sync_dirty_buffer(sbh);
4640 if (error)
4641 return error;
4642
4643 error = buffer_write_io_error(sbh);
4644 if (error) {
b31e1552
ES		 4645 ext4_msg(sb, KERN_ERR, "I/O error while writing "
4646 "superblock");
914258bf
TT		 4647 clear_buffer_write_io_error(sbh);
4648 set_buffer_uptodate(sbh);
4649 }
4650 }
c4be0c1d 4651 return error;
ac27a0ec
DK		 4652}
4653
ac27a0ec
DK		 4654/*
4655 * Have we just finished recovery? If so, and if we are mounting (or
4656 * remounting) the filesystem readonly, then we will end up with a
4657 * consistent fs on disk. Record that fact.
4658 */
2b2d6d01
TT		 4659static void ext4_mark_recovery_complete(struct super_block *sb,
4660 struct ext4_super_block *es)
ac27a0ec 4661{
617ba13b 4662 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 4663
0390131b
FM		 4664 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
4665 BUG_ON(journal != NULL);
4666 return;
4667 }
dab291af 4668 jbd2_journal_lock_updates(journal);
7ffe1ea8
HK		 4669 if (jbd2_journal_flush(journal) < 0)
4670 goto out;
4671
617ba13b 4672 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
ac27a0ec 4673 sb->s_flags & MS_RDONLY) {
617ba13b 4674 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
e2d67052 4675 ext4_commit_super(sb, 1);
ac27a0ec 4676 }
7ffe1ea8
HK		 4677
4678out:
dab291af 4679 jbd2_journal_unlock_updates(journal);
ac27a0ec
DK		 4680}
4681
4682/*
4683 * If we are mounting (or read-write remounting) a filesystem whose journal
4684 * has recorded an error from a previous lifetime, move that error to the
4685 * main filesystem now.
4686 */
2b2d6d01
TT		 4687static void ext4_clear_journal_err(struct super_block *sb,
4688 struct ext4_super_block *es)
ac27a0ec
DK		 4689{
4690 journal_t *journal;
4691 int j_errno;
4692 const char *errstr;
4693
0390131b
FM		 4694 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4695
617ba13b 4696 journal = EXT4_SB(sb)->s_journal;
ac27a0ec
DK		 4697
4698 /*
4699 * Now check for any error status which may have been recorded in the
617ba13b 4700 * journal by a prior ext4_error() or ext4_abort()
ac27a0ec
DK		 4701 */
4702
dab291af 4703 j_errno = jbd2_journal_errno(journal);
ac27a0ec
DK		 4704 if (j_errno) {
4705 char nbuf[16];
4706
617ba13b 4707 errstr = ext4_decode_error(sb, j_errno, nbuf);
12062ddd 4708 ext4_warning(sb, "Filesystem error recorded "
ac27a0ec 4709 "from previous mount: %s", errstr);
12062ddd 4710 ext4_warning(sb, "Marking fs in need of filesystem check.");
ac27a0ec 4711
617ba13b
MC		 4712 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
4713 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
e2d67052 4714 ext4_commit_super(sb, 1);
ac27a0ec 4715
dab291af 4716 jbd2_journal_clear_err(journal);
d796c52e 4717 jbd2_journal_update_sb_errno(journal);
ac27a0ec
DK		 4718 }
4719}
4720
4721/*
4722 * Force the running and committing transactions to commit,
4723 * and wait on the commit.
4724 */
617ba13b 4725int ext4_force_commit(struct super_block *sb)
ac27a0ec
DK		 4726{
4727 journal_t *journal;
ac27a0ec
DK		 4728
4729 if (sb->s_flags & MS_RDONLY)
4730 return 0;
4731
617ba13b 4732 journal = EXT4_SB(sb)->s_journal;
b1deefc9 4733 return ext4_journal_force_commit(journal);
ac27a0ec
DK		 4734}
4735
617ba13b 4736static int ext4_sync_fs(struct super_block *sb, int wait)
ac27a0ec 4737{
14ce0cb4 4738 int ret = 0;
9eddacf9 4739 tid_t target;
06a407f1 4740 bool needs_barrier = false;
8d5d02e6 4741 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4742
9bffad1e 4743 trace_ext4_sync_fs(sb, wait);
2e8fa54e 4744 flush_workqueue(sbi->rsv_conversion_wq);
a1177825
JK		 4745 /*
4746 * Writeback quota in non-journalled quota case - journalled quota has
4747 * no dirty dquots
4748 */
4749 dquot_writeback_dquots(sb, -1);
06a407f1
DM		 4750 /*
4751 * Data writeback is possible w/o journal transaction, so barrier must
4752 * being sent at the end of the function. But we can skip it if
4753 * transaction_commit will do it for us.
4754 */
bda32530
TT		 4755 if (sbi->s_journal) {
4756 target = jbd2_get_latest_transaction(sbi->s_journal);
4757 if (wait && sbi->s_journal->j_flags & JBD2_BARRIER &&
4758 !jbd2_trans_will_send_data_barrier(sbi->s_journal, target))
4759 needs_barrier = true;
4760
4761 if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
4762 if (wait)
4763 ret = jbd2_log_wait_commit(sbi->s_journal,
4764 target);
4765 }
4766 } else if (wait && test_opt(sb, BARRIER))
06a407f1 4767 needs_barrier = true;
06a407f1
DM		 4768 if (needs_barrier) {
4769 int err;
4770 err = blkdev_issue_flush(sb->s_bdev, GFP_KERNEL, NULL);
4771 if (!ret)
4772 ret = err;
0390131b 4773 }
06a407f1
DM		 4774
4775 return ret;
4776}
4777
ac27a0ec
DK		 4778/*
4779 * LVM calls this function before a (read-only) snapshot is created. This
4780 * gives us a chance to flush the journal completely and mark the fs clean.
be4f27d3
YY		 4781 *
4782 * Note that only this function cannot bring a filesystem to be in a clean
8e8ad8a5
JK		 4783 * state independently. It relies on upper layer to stop all data & metadata
4784 * modifications.
ac27a0ec 4785 */
c4be0c1d 4786static int ext4_freeze(struct super_block *sb)
ac27a0ec 4787{
c4be0c1d
TS		 4788 int error = 0;
4789 journal_t *journal;
ac27a0ec 4790
9ca92389
TT		 4791 if (sb->s_flags & MS_RDONLY)
4792 return 0;
ac27a0ec 4793
9ca92389 4794 journal = EXT4_SB(sb)->s_journal;
7ffe1ea8 4795
bb044576
TT		 4796 if (journal) {
4797 /* Now we set up the journal barrier. */
4798 jbd2_journal_lock_updates(journal);
ac27a0ec 4799
bb044576
TT		 4800 /*
4801 * Don't clear the needs_recovery flag if we failed to
4802 * flush the journal.
4803 */
4804 error = jbd2_journal_flush(journal);
4805 if (error < 0)
4806 goto out;
4807 }
9ca92389
TT		 4808
4809 /* Journal blocked and flushed, clear needs_recovery flag. */
4810 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4811 error = ext4_commit_super(sb, 1);
6b0310fb 4812out:
bb044576
TT		 4813 if (journal)
4814 /* we rely on upper layer to stop further updates */
4815 jbd2_journal_unlock_updates(journal);
6b0310fb 4816 return error;
ac27a0ec
DK		 4817}
4818
4819/*
4820 * Called by LVM after the snapshot is done. We need to reset the RECOVER
4821 * flag here, even though the filesystem is not technically dirty yet.
4822 */
c4be0c1d 4823static int ext4_unfreeze(struct super_block *sb)
ac27a0ec 4824{
9ca92389
TT		 4825 if (sb->s_flags & MS_RDONLY)
4826 return 0;
4827
9ca92389
TT		 4828 /* Reset the needs_recovery flag before the fs is unlocked. */
4829 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4830 ext4_commit_super(sb, 1);
c4be0c1d 4831 return 0;
ac27a0ec
DK		 4832}
4833
673c6100
TT		 4834/*
4835 * Structure to save mount options for ext4_remount's benefit
4836 */
4837struct ext4_mount_options {
4838 unsigned long s_mount_opt;
a2595b8a 4839 unsigned long s_mount_opt2;
08cefc7a
EB		 4840 kuid_t s_resuid;
4841 kgid_t s_resgid;
673c6100
TT		 4842 unsigned long s_commit_interval;
4843 u32 s_min_batch_time, s_max_batch_time;
4844#ifdef CONFIG_QUOTA
4845 int s_jquota_fmt;
a2d4a646 4846 char *s_qf_names[EXT4_MAXQUOTAS];
673c6100
TT		 4847#endif
4848};
4849
2b2d6d01 4850static int ext4_remount(struct super_block *sb, int *flags, char *data)
ac27a0ec 4851{
2b2d6d01 4852 struct ext4_super_block *es;
617ba13b 4853 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4854 unsigned long old_sb_flags;
617ba13b 4855 struct ext4_mount_options old_opts;
c79d967d 4856 int enable_quota = 0;
8a266467 4857 ext4_group_t g;
b3881f74 4858 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
c5e06d10 4859 int err = 0;
ac27a0ec 4860#ifdef CONFIG_QUOTA
03dafb5f 4861 int i, j;
ac27a0ec 4862#endif
d4c402d9 4863 char *orig_data = kstrdup(data, GFP_KERNEL);
ac27a0ec
DK		 4864
4865 /* Store the original options */
4866 old_sb_flags = sb->s_flags;
4867 old_opts.s_mount_opt = sbi->s_mount_opt;
a2595b8a 4868 old_opts.s_mount_opt2 = sbi->s_mount_opt2;
ac27a0ec
DK		 4869 old_opts.s_resuid = sbi->s_resuid;
4870 old_opts.s_resgid = sbi->s_resgid;
4871 old_opts.s_commit_interval = sbi->s_commit_interval;
30773840
TT		 4872 old_opts.s_min_batch_time = sbi->s_min_batch_time;
4873 old_opts.s_max_batch_time = sbi->s_max_batch_time;
ac27a0ec
DK		 4874#ifdef CONFIG_QUOTA
4875 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
a2d4a646 4876 for (i = 0; i < EXT4_MAXQUOTAS; i++)
03dafb5f
CG		 4877 if (sbi->s_qf_names[i]) {
4878 old_opts.s_qf_names[i] = kstrdup(sbi->s_qf_names[i],
4879 GFP_KERNEL);
4880 if (!old_opts.s_qf_names[i]) {
4881 for (j = 0; j < i; j++)
4882 kfree(old_opts.s_qf_names[j]);
3e36a163 4883 kfree(orig_data);
03dafb5f
CG		 4884 return -ENOMEM;
4885 }
4886 } else
4887 old_opts.s_qf_names[i] = NULL;
ac27a0ec 4888#endif
b3881f74
TT		 4889 if (sbi->s_journal && sbi->s_journal->j_task->io_context)
4890 journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
ac27a0ec 4891
661aa520 4892 if (!parse_options(data, sb, NULL, &journal_ioprio, 1)) {
ac27a0ec
DK		 4893 err = -EINVAL;
4894 goto restore_opts;
4895 }
4896
6b992ff2 4897 if ((old_opts.s_mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) ^
c6d3d56d
DW		 4898 test_opt(sb, JOURNAL_CHECKSUM)) {
4899 ext4_msg(sb, KERN_ERR, "changing journal_checksum "
2d5b86e0
ES		 4900 "during remount not supported; ignoring");
4901 sbi->s_mount_opt ^= EXT4_MOUNT_JOURNAL_CHECKSUM;
6b992ff2
DW		 4902 }
4903
6ae6514b
PS		 4904 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
4905 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
4906 ext4_msg(sb, KERN_ERR, "can't mount with "
4907 "both data=journal and delalloc");
4908 err = -EINVAL;
4909 goto restore_opts;
4910 }
4911 if (test_opt(sb, DIOREAD_NOLOCK)) {
4912 ext4_msg(sb, KERN_ERR, "can't mount with "
4913 "both data=journal and dioread_nolock");
4914 err = -EINVAL;
4915 goto restore_opts;
4916 }
923ae0ff
RZ		 4917 if (test_opt(sb, DAX)) {
4918 ext4_msg(sb, KERN_ERR, "can't mount with "
4919 "both data=journal and dax");
4920 err = -EINVAL;
4921 goto restore_opts;
4922 }
4923 }
4924
4925 if ((sbi->s_mount_opt ^ old_opts.s_mount_opt) & EXT4_MOUNT_DAX) {
4926 ext4_msg(sb, KERN_WARNING, "warning: refusing change of "
4927 "dax flag with busy inodes while remounting");
4928 sbi->s_mount_opt ^= EXT4_MOUNT_DAX;
6ae6514b
PS		 4929 }
4930
4ab2f15b 4931 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
c67d859e 4932 ext4_abort(sb, "Abort forced by user");
ac27a0ec
DK		 4933
4934 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
482a7425 4935 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec
DK		 4936
4937 es = sbi->s_es;
4938
b3881f74 4939 if (sbi->s_journal) {
0390131b 4940 ext4_init_journal_params(sb, sbi->s_journal);
b3881f74
TT		 4941 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
4942 }
ac27a0ec 4943
661aa520 4944 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
4ab2f15b 4945 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) {
ac27a0ec
DK		 4946 err = -EROFS;
4947 goto restore_opts;
4948 }
4949
4950 if (*flags & MS_RDONLY) {
38c03b34
TT		 4951 err = sync_filesystem(sb);
4952 if (err < 0)
4953 goto restore_opts;
0f0dd62f
CH		 4954 err = dquot_suspend(sb, -1);
4955 if (err < 0)
c79d967d 4956 goto restore_opts;
c79d967d 4957
ac27a0ec
DK		 4958 /*
4959 * First of all, the unconditional stuff we have to do
4960 * to disable replay of the journal when we next remount
4961 */
4962 sb->s_flags |= MS_RDONLY;
4963
4964 /*
4965 * OK, test if we are remounting a valid rw partition
4966 * readonly, and if so set the rdonly flag and then
4967 * mark the partition as valid again.
4968 */
617ba13b
MC		 4969 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
4970 (sbi->s_mount_state & EXT4_VALID_FS))
ac27a0ec
DK		 4971 es->s_state = cpu_to_le16(sbi->s_mount_state);
4972
a63c9eb2 4973 if (sbi->s_journal)
0390131b 4974 ext4_mark_recovery_complete(sb, es);
ac27a0ec 4975 } else {
a13fb1a4 4976 /* Make sure we can mount this feature set readwrite */
2cb5cc8b
DW		 4977 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
4978 EXT4_FEATURE_RO_COMPAT_READONLY) ||
4979 !ext4_feature_set_ok(sb, 0)) {
ac27a0ec
DK		 4980 err = -EROFS;
4981 goto restore_opts;
4982 }
8a266467
TT		 4983 /*
4984 * Make sure the group descriptor checksums
0b8e58a1 4985 * are sane. If they aren't, refuse to remount r/w.
8a266467
TT		 4986 */
4987 for (g = 0; g < sbi->s_groups_count; g++) {
4988 struct ext4_group_desc *gdp =
4989 ext4_get_group_desc(sb, g, NULL);
4990
feb0ab32 4991 if (!ext4_group_desc_csum_verify(sb, g, gdp)) {
b31e1552
ES		 4992 ext4_msg(sb, KERN_ERR,
4993 "ext4_remount: Checksum for group %u failed (%u!=%u)",
8a266467
TT		 4994 g, le16_to_cpu(ext4_group_desc_csum(sbi, g, gdp)),
4995 le16_to_cpu(gdp->bg_checksum));
4996 err = -EINVAL;
4997 goto restore_opts;
4998 }
4999 }
5000
ead6596b
ES		 5001 /*
5002 * If we have an unprocessed orphan list hanging
5003 * around from a previously readonly bdev mount,
5004 * require a full umount/remount for now.
5005 */
5006 if (es->s_last_orphan) {
b31e1552 5007 ext4_msg(sb, KERN_WARNING, "Couldn't "
ead6596b
ES		 5008 "remount RDWR because of unprocessed "
5009 "orphan inode list. Please "
b31e1552 5010 "umount/remount instead");
ead6596b
ES		 5011 err = -EINVAL;
5012 goto restore_opts;
5013 }
5014
ac27a0ec
DK		 5015 /*
5016 * Mounting a RDONLY partition read-write, so reread
5017 * and store the current valid flag. (It may have
5018 * been changed by e2fsck since we originally mounted
5019 * the partition.)
5020 */
0390131b
FM		 5021 if (sbi->s_journal)
5022 ext4_clear_journal_err(sb, es);
ac27a0ec 5023 sbi->s_mount_state = le16_to_cpu(es->s_state);
2b2d6d01 5024 if (!ext4_setup_super(sb, es, 0))
ac27a0ec 5025 sb->s_flags &= ~MS_RDONLY;
c5e06d10
JL		 5026 if (EXT4_HAS_INCOMPAT_FEATURE(sb,
5027 EXT4_FEATURE_INCOMPAT_MMP))
5028 if (ext4_multi_mount_protect(sb,
5029 le64_to_cpu(es->s_mmp_block))) {
5030 err = -EROFS;
5031 goto restore_opts;
5032 }
c79d967d 5033 enable_quota = 1;
ac27a0ec
DK		 5034 }
5035 }
bfff6873
LC		 5036
5037 /*
5038 * Reinitialize lazy itable initialization thread based on
5039 * current settings
5040 */
5041 if ((sb->s_flags & MS_RDONLY) || !test_opt(sb, INIT_INODE_TABLE))
5042 ext4_unregister_li_request(sb);
5043 else {
5044 ext4_group_t first_not_zeroed;
5045 first_not_zeroed = ext4_has_uninit_itable(sb);
5046 ext4_register_li_request(sb, first_not_zeroed);
5047 }
5048
6fd058f7 5049 ext4_setup_system_zone(sb);
d096ad0f 5050 if (sbi->s_journal == NULL && !(old_sb_flags & MS_RDONLY))
e2d67052 5051 ext4_commit_super(sb, 1);
0390131b 5052
ac27a0ec
DK		 5053#ifdef CONFIG_QUOTA
5054 /* Release old quota file names */
a2d4a646 5055 for (i = 0; i < EXT4_MAXQUOTAS; i++)
03dafb5f 5056 kfree(old_opts.s_qf_names[i]);
7c319d32
AK		 5057 if (enable_quota) {
5058 if (sb_any_quota_suspended(sb))
5059 dquot_resume(sb, -1);
5060 else if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
5061 EXT4_FEATURE_RO_COMPAT_QUOTA)) {
5062 err = ext4_enable_quotas(sb);
07724f98 5063 if (err)
7c319d32 5064 goto restore_opts;
7c319d32
AK		 5065 }
5066 }
ac27a0ec 5067#endif
d4c402d9 5068
a26f4992 5069 *flags = (*flags & ~MS_LAZYTIME) | (sb->s_flags & MS_LAZYTIME);
d4c402d9
CW		 5070 ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s", orig_data);
5071 kfree(orig_data);
ac27a0ec 5072 return 0;
0b8e58a1 5073
ac27a0ec
DK		 5074restore_opts:
5075 sb->s_flags = old_sb_flags;
5076 sbi->s_mount_opt = old_opts.s_mount_opt;
a2595b8a 5077 sbi->s_mount_opt2 = old_opts.s_mount_opt2;
ac27a0ec
DK		 5078 sbi->s_resuid = old_opts.s_resuid;
5079 sbi->s_resgid = old_opts.s_resgid;
5080 sbi->s_commit_interval = old_opts.s_commit_interval;
30773840
TT		 5081 sbi->s_min_batch_time = old_opts.s_min_batch_time;
5082 sbi->s_max_batch_time = old_opts.s_max_batch_time;
ac27a0ec
DK		 5083#ifdef CONFIG_QUOTA
5084 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
a2d4a646 5085 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
03dafb5f 5086 kfree(sbi->s_qf_names[i]);
ac27a0ec
DK		 5087 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
5088 }
5089#endif
d4c402d9 5090 kfree(orig_data);
ac27a0ec
DK		 5091 return err;
5092}
5093
2b2d6d01 5094static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
ac27a0ec
DK		 5095{
5096 struct super_block *sb = dentry->d_sb;
617ba13b
MC		 5097 struct ext4_sb_info *sbi = EXT4_SB(sb);
5098 struct ext4_super_block *es = sbi->s_es;
27dd4385 5099 ext4_fsblk_t overhead = 0, resv_blocks;
960cc398 5100 u64 fsid;
d02a9391 5101 s64 bfree;
27dd4385 5102 resv_blocks = EXT4_C2B(sbi, atomic64_read(&sbi->s_resv_clusters));
ac27a0ec 5103
952fc18e
TT		 5104 if (!test_opt(sb, MINIX_DF))
5105 overhead = sbi->s_overhead;
ac27a0ec 5106
617ba13b 5107 buf->f_type = EXT4_SUPER_MAGIC;
ac27a0ec 5108 buf->f_bsize = sb->s_blocksize;
b72f78cb 5109 buf->f_blocks = ext4_blocks_count(es) - EXT4_C2B(sbi, overhead);
57042651
TT		 5110 bfree = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) -
5111 percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter);
d02a9391 5112 /* prevent underflow in case that few free space is available */
57042651 5113 buf->f_bfree = EXT4_C2B(sbi, max_t(s64, bfree, 0));
27dd4385
LC		 5114 buf->f_bavail = buf->f_bfree -
5115 (ext4_r_blocks_count(es) + resv_blocks);
5116 if (buf->f_bfree < (ext4_r_blocks_count(es) + resv_blocks))
ac27a0ec
DK		 5117 buf->f_bavail = 0;
5118 buf->f_files = le32_to_cpu(es->s_inodes_count);
52d9f3b4 5119 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
617ba13b 5120 buf->f_namelen = EXT4_NAME_LEN;
960cc398
PE		 5121 fsid = le64_to_cpup((void *)es->s_uuid) ^
5122 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
5123 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
5124 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
0b8e58a1 5125
ac27a0ec
DK		 5126 return 0;
5127}
5128
0b8e58a1
AD		 5129/* Helper function for writing quotas on sync - we need to start transaction
5130 * before quota file is locked for write. Otherwise the are possible deadlocks:
ac27a0ec 5131 * Process 1 Process 2
617ba13b 5132 * ext4_create() quota_sync()
a269eb18 5133 * jbd2_journal_start() write_dquot()
871a2931 5134 * dquot_initialize() down(dqio_mutex)
dab291af 5135 * down(dqio_mutex) jbd2_journal_start()
ac27a0ec
DK		 5136 *
5137 */
5138
5139#ifdef CONFIG_QUOTA
5140
5141static inline struct inode *dquot_to_inode(struct dquot *dquot)
5142{
4c376dca 5143 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_id.type];
ac27a0ec
DK		 5144}
5145
617ba13b 5146static int ext4_write_dquot(struct dquot *dquot)
ac27a0ec
DK		 5147{
5148 int ret, err;
5149 handle_t *handle;
5150 struct inode *inode;
5151
5152 inode = dquot_to_inode(dquot);
9924a92a 5153 handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
0b8e58a1 5154 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 5155 if (IS_ERR(handle))
5156 return PTR_ERR(handle);
5157 ret = dquot_commit(dquot);
617ba13b 5158 err = ext4_journal_stop(handle);
ac27a0ec
DK		 5159 if (!ret)
5160 ret = err;
5161 return ret;
5162}
5163
617ba13b 5164static int ext4_acquire_dquot(struct dquot *dquot)
ac27a0ec
DK		 5165{
5166 int ret, err;
5167 handle_t *handle;
5168
9924a92a 5169 handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
0b8e58a1 5170 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 5171 if (IS_ERR(handle))
5172 return PTR_ERR(handle);
5173 ret = dquot_acquire(dquot);
617ba13b 5174 err = ext4_journal_stop(handle);
ac27a0ec
DK		 5175 if (!ret)
5176 ret = err;
5177 return ret;
5178}
5179
617ba13b 5180static int ext4_release_dquot(struct dquot *dquot)
ac27a0ec
DK		 5181{
5182 int ret, err;
5183 handle_t *handle;
5184
9924a92a 5185 handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
0b8e58a1 5186 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
9c3013e9
JK		 5187 if (IS_ERR(handle)) {
5188 /* Release dquot anyway to avoid endless cycle in dqput() */
5189 dquot_release(dquot);
ac27a0ec 5190 return PTR_ERR(handle);
9c3013e9 5191 }
ac27a0ec 5192 ret = dquot_release(dquot);
617ba13b 5193 err = ext4_journal_stop(handle);
ac27a0ec
DK		 5194 if (!ret)
5195 ret = err;
5196 return ret;
5197}
5198
617ba13b 5199static int ext4_mark_dquot_dirty(struct dquot *dquot)
ac27a0ec 5200{
262b4662
JK		 5201 struct super_block *sb = dquot->dq_sb;
5202 struct ext4_sb_info *sbi = EXT4_SB(sb);
5203
2c8be6b2 5204 /* Are we journaling quotas? */
262b4662
JK		 5205 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) ||
5206 sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
ac27a0ec 5207 dquot_mark_dquot_dirty(dquot);
617ba13b 5208 return ext4_write_dquot(dquot);
ac27a0ec
DK		 5209 } else {
5210 return dquot_mark_dquot_dirty(dquot);
5211 }
5212}
5213
617ba13b 5214static int ext4_write_info(struct super_block *sb, int type)
ac27a0ec
DK		 5215{
5216 int ret, err;
5217 handle_t *handle;
5218
5219 /* Data block + inode block */
2b0143b5 5220 handle = ext4_journal_start(d_inode(sb->s_root), EXT4_HT_QUOTA, 2);
ac27a0ec
DK		 5221 if (IS_ERR(handle))
5222 return PTR_ERR(handle);
5223 ret = dquot_commit_info(sb, type);
617ba13b 5224 err = ext4_journal_stop(handle);
ac27a0ec
DK		 5225 if (!ret)
5226 ret = err;
5227 return ret;
5228}
5229
5230/*
5231 * Turn on quotas during mount time - we need to find
5232 * the quota file and such...
5233 */
617ba13b 5234static int ext4_quota_on_mount(struct super_block *sb, int type)
ac27a0ec 5235{
287a8095
CH		 5236 return dquot_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
5237 EXT4_SB(sb)->s_jquota_fmt, type);
ac27a0ec
DK		 5238}
5239
5240/*
5241 * Standard function to be called on quota_on
5242 */
617ba13b 5243static int ext4_quota_on(struct super_block *sb, int type, int format_id,
f00c9e44 5244 struct path *path)
ac27a0ec
DK		 5245{
5246 int err;
ac27a0ec
DK		 5247
5248 if (!test_opt(sb, QUOTA))
5249 return -EINVAL;
0623543b 5250
ac27a0ec 5251 /* Quotafile not on the same filesystem? */
d8c9584e 5252 if (path->dentry->d_sb != sb)
ac27a0ec 5253 return -EXDEV;
0623543b
JK		 5254 /* Journaling quota? */
5255 if (EXT4_SB(sb)->s_qf_names[type]) {
2b2d6d01 5256 /* Quotafile not in fs root? */
f00c9e44 5257 if (path->dentry->d_parent != sb->s_root)
b31e1552
ES		 5258 ext4_msg(sb, KERN_WARNING,
5259 "Quota file not on filesystem root. "
5260 "Journaled quota will not work");
2b2d6d01 5261 }
0623543b
JK		 5262
5263 /*
5264 * When we journal data on quota file, we have to flush journal to see
5265 * all updates to the file when we bypass pagecache...
5266 */
0390131b 5267 if (EXT4_SB(sb)->s_journal &&
2b0143b5 5268 ext4_should_journal_data(d_inode(path->dentry))) {
0623543b
JK		 5269 /*
5270 * We don't need to lock updates but journal_flush() could
5271 * otherwise be livelocked...
5272 */
5273 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
7ffe1ea8 5274 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
0623543b 5275 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
f00c9e44 5276 if (err)
7ffe1ea8 5277 return err;
0623543b
JK		 5278 }
5279
f00c9e44 5280 return dquot_quota_on(sb, type, format_id, path);
ac27a0ec
DK		 5281}
5282
7c319d32
AK		 5283static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
5284 unsigned int flags)
5285{
5286 int err;
5287 struct inode *qf_inode;
a2d4a646 5288 unsigned long qf_inums[EXT4_MAXQUOTAS] = {
7c319d32
AK		 5289 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
5290 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum)
5291 };
5292
5293 BUG_ON(!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA));
5294
5295 if (!qf_inums[type])
5296 return -EPERM;
5297
5298 qf_inode = ext4_iget(sb, qf_inums[type]);
5299 if (IS_ERR(qf_inode)) {
5300 ext4_error(sb, "Bad quota inode # %lu", qf_inums[type]);
5301 return PTR_ERR(qf_inode);
5302 }
5303
bcb13850
JK		 5304 /* Don't account quota for quota files to avoid recursion */
5305 qf_inode->i_flags |= S_NOQUOTA;
7c319d32
AK		 5306 err = dquot_enable(qf_inode, type, format_id, flags);
5307 iput(qf_inode);
5308
5309 return err;
5310}
5311
5312/* Enable usage tracking for all quota types. */
5313static int ext4_enable_quotas(struct super_block *sb)
5314{
5315 int type, err = 0;
a2d4a646 5316 unsigned long qf_inums[EXT4_MAXQUOTAS] = {
7c319d32
AK		 5317 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
5318 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum)
5319 };
5320
5321 sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE;
a2d4a646 5322 for (type = 0; type < EXT4_MAXQUOTAS; type++) {
7c319d32
AK		 5323 if (qf_inums[type]) {
5324 err = ext4_quota_enable(sb, type, QFMT_VFS_V1,
5325 DQUOT_USAGE_ENABLED);
5326 if (err) {
5327 ext4_warning(sb,
72ba7450
TT		 5328 "Failed to enable quota tracking "
5329 "(type=%d, err=%d). Please run "
5330 "e2fsck to fix.", type, err);
7c319d32
AK		 5331 return err;
5332 }
5333 }
5334 }
5335 return 0;
5336}
5337
ca0e05e4
DM		 5338static int ext4_quota_off(struct super_block *sb, int type)
5339{
21f97697
JK		 5340 struct inode *inode = sb_dqopt(sb)->files[type];
5341 handle_t *handle;
5342
87009d86
DM		 5343 /* Force all delayed allocation blocks to be allocated.
5344 * Caller already holds s_umount sem */
5345 if (test_opt(sb, DELALLOC))
ca0e05e4 5346 sync_filesystem(sb);
ca0e05e4 5347
0b268590
AG		 5348 if (!inode)
5349 goto out;
5350
21f97697
JK		 5351 /* Update modification times of quota files when userspace can
5352 * start looking at them */
9924a92a 5353 handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1);
21f97697
JK		 5354 if (IS_ERR(handle))
5355 goto out;
5356 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
5357 ext4_mark_inode_dirty(handle, inode);
5358 ext4_journal_stop(handle);
5359
5360out:
ca0e05e4
DM		 5361 return dquot_quota_off(sb, type);
5362}
5363
ac27a0ec
DK		 5364/* Read data from quotafile - avoid pagecache and such because we cannot afford
5365 * acquiring the locks... As quota files are never truncated and quota code
25985edc 5366 * itself serializes the operations (and no one else should touch the files)
ac27a0ec 5367 * we don't have to be afraid of races */
617ba13b 5368static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec
DK		 5369 size_t len, loff_t off)
5370{
5371 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 5372 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 5373 int offset = off & (sb->s_blocksize - 1);
5374 int tocopy;
5375 size_t toread;
5376 struct buffer_head *bh;
5377 loff_t i_size = i_size_read(inode);
5378
5379 if (off > i_size)
5380 return 0;
5381 if (off+len > i_size)
5382 len = i_size-off;
5383 toread = len;
5384 while (toread > 0) {
5385 tocopy = sb->s_blocksize - offset < toread ?
5386 sb->s_blocksize - offset : toread;
1c215028
TT		 5387 bh = ext4_bread(NULL, inode, blk, 0);
5388 if (IS_ERR(bh))
5389 return PTR_ERR(bh);
ac27a0ec
DK		 5390 if (!bh) /* A hole? */
5391 memset(data, 0, tocopy);
5392 else
5393 memcpy(data, bh->b_data+offset, tocopy);
5394 brelse(bh);
5395 offset = 0;
5396 toread -= tocopy;
5397 data += tocopy;
5398 blk++;
5399 }
5400 return len;
5401}
5402
5403/* Write to quotafile (we know the transaction is already started and has
5404 * enough credits) */
617ba13b 5405static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec
DK		 5406 const char *data, size_t len, loff_t off)
5407{
5408 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 5409 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
1c215028 5410 int err, offset = off & (sb->s_blocksize - 1);
ac27a0ec
DK		 5411 struct buffer_head *bh;
5412 handle_t *handle = journal_current_handle();
5413
0390131b 5414 if (EXT4_SB(sb)->s_journal && !handle) {
b31e1552
ES		 5415 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
5416 " cancelled because transaction is not started",
9c3013e9
JK		 5417 (unsigned long long)off, (unsigned long long)len);
5418 return -EIO;
5419 }
67eeb568
DM		 5420 /*
5421 * Since we account only one data block in transaction credits,
5422 * then it is impossible to cross a block boundary.
5423 */
5424 if (sb->s_blocksize - offset < len) {
5425 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
5426 " cancelled because not block aligned",
5427 (unsigned long long)off, (unsigned long long)len);
5428 return -EIO;
5429 }
5430
1c215028
TT		 5431 bh = ext4_bread(handle, inode, blk, 1);
5432 if (IS_ERR(bh))
5433 return PTR_ERR(bh);
67eeb568
DM		 5434 if (!bh)
5435 goto out;
5d601255 5436 BUFFER_TRACE(bh, "get write access");
62d2b5f2
JK		 5437 err = ext4_journal_get_write_access(handle, bh);
5438 if (err) {
5439 brelse(bh);
1c215028 5440 return err;
ac27a0ec 5441 }
67eeb568
DM		 5442 lock_buffer(bh);
5443 memcpy(bh->b_data+offset, data, len);
5444 flush_dcache_page(bh->b_page);
5445 unlock_buffer(bh);
62d2b5f2 5446 err = ext4_handle_dirty_metadata(handle, NULL, bh);
67eeb568 5447 brelse(bh);
ac27a0ec 5448out:
67eeb568
DM		 5449 if (inode->i_size < off + len) {
5450 i_size_write(inode, off + len);
617ba13b 5451 EXT4_I(inode)->i_disksize = inode->i_size;
21f97697 5452 ext4_mark_inode_dirty(handle, inode);
ac27a0ec 5453 }
67eeb568 5454 return len;
ac27a0ec
DK		 5455}
5456
5457#endif
5458
152a0836
AV		 5459static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
5460 const char *dev_name, void *data)
ac27a0ec 5461{
152a0836 5462 return mount_bdev(fs_type, flags, dev_name, data, ext4_fill_super);
ac27a0ec
DK		 5463}
5464
37f328eb 5465#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
24b58424
TT		 5466static inline void register_as_ext2(void)
5467{
5468 int err = register_filesystem(&ext2_fs_type);
5469 if (err)
5470 printk(KERN_WARNING
5471 "EXT4-fs: Unable to register as ext2 (%d)\n", err);
5472}
5473
5474static inline void unregister_as_ext2(void)
5475{
5476 unregister_filesystem(&ext2_fs_type);
5477}
2035e776
TT		 5478
5479static inline int ext2_feature_set_ok(struct super_block *sb)
5480{
5481 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP))
5482 return 0;
5483 if (sb->s_flags & MS_RDONLY)
5484 return 1;
5485 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))
5486 return 0;
5487 return 1;
5488}
24b58424
TT		 5489#else
5490static inline void register_as_ext2(void) { }
5491static inline void unregister_as_ext2(void) { }
2035e776 5492static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; }
24b58424
TT		 5493#endif
5494
37f328eb 5495#if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
24b58424
TT		 5496static inline void register_as_ext3(void)
5497{
5498 int err = register_filesystem(&ext3_fs_type);
5499 if (err)
5500 printk(KERN_WARNING
5501 "EXT4-fs: Unable to register as ext3 (%d)\n", err);
5502}
5503
5504static inline void unregister_as_ext3(void)
5505{
5506 unregister_filesystem(&ext3_fs_type);
5507}
2035e776
TT		 5508
5509static inline int ext3_feature_set_ok(struct super_block *sb)
5510{
5511 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP))
5512 return 0;
5513 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
5514 return 0;
5515 if (sb->s_flags & MS_RDONLY)
5516 return 1;
5517 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP))
5518 return 0;
5519 return 1;
5520}
24b58424
TT		 5521#else
5522static inline void register_as_ext3(void) { }
5523static inline void unregister_as_ext3(void) { }
2035e776 5524static inline int ext3_feature_set_ok(struct super_block *sb) { return 0; }
24b58424
TT		 5525#endif
5526
03010a33
TT		 5527static struct file_system_type ext4_fs_type = {
5528 .owner = THIS_MODULE,
5529 .name = "ext4",
152a0836 5530 .mount = ext4_mount,
03010a33
TT		 5531 .kill_sb = kill_block_super,
5532 .fs_flags = FS_REQUIRES_DEV,
5533};
7f78e035 5534MODULE_ALIAS_FS("ext4");
03010a33 5535
8f021222 5536static int __init ext4_init_feat_adverts(void)
857ac889
LC		 5537{
5538 struct ext4_features *ef;
5539 int ret = -ENOMEM;
5540
5541 ef = kzalloc(sizeof(struct ext4_features), GFP_KERNEL);
5542 if (!ef)
5543 goto out;
5544
5545 ef->f_kobj.kset = ext4_kset;
5546 init_completion(&ef->f_kobj_unregister);
5547 ret = kobject_init_and_add(&ef->f_kobj, &ext4_feat_ktype, NULL,
5548 "features");
5549 if (ret) {
5550 kfree(ef);
5551 goto out;
5552 }
5553
5554 ext4_feat = ef;
5555 ret = 0;
5556out:
5557 return ret;
5558}
5559
8f021222
LC		 5560static void ext4_exit_feat_adverts(void)
5561{
5562 kobject_put(&ext4_feat->f_kobj);
5563 wait_for_completion(&ext4_feat->f_kobj_unregister);
5564 kfree(ext4_feat);
5565}
5566
e9e3bcec
ES		 5567/* Shared across all ext4 file systems */
5568wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
5569struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ];
5570
5dabfc78 5571static int __init ext4_init_fs(void)
ac27a0ec 5572{
e9e3bcec 5573 int i, err;
c9de560d 5574
07c0c5d8
AV		 5575 ext4_li_info = NULL;
5576 mutex_init(&ext4_li_mtx);
5577
9a4c8019 5578 /* Build-time check for flags consistency */
12e9b892 5579 ext4_check_flag_values();
e9e3bcec
ES		 5580
5581 for (i = 0; i < EXT4_WQ_HASH_SZ; i++) {
5582 mutex_init(&ext4__aio_mutex[i]);
5583 init_waitqueue_head(&ext4__ioend_wq[i]);
5584 }
5585
51865fda 5586 err = ext4_init_es();
6fd058f7
TT		 5587 if (err)
5588 return err;
51865fda
ZL		 5589
5590 err = ext4_init_pageio();
5591 if (err)
5592 goto out7;
5593
5dabfc78 5594 err = ext4_init_system_zone();
bd2d0210 5595 if (err)
d44651d0 5596 goto out6;
3197ebdb 5597 ext4_kset = kset_create_and_add("ext4", NULL, fs_kobj);
0e376b1e
TT		 5598 if (!ext4_kset) {
5599 err = -ENOMEM;
dd68314c 5600 goto out5;
0e376b1e 5601 }
d44651d0 5602 ext4_proc_root = proc_mkdir("fs/ext4", NULL);
857ac889
LC		 5603
5604 err = ext4_init_feat_adverts();
dd68314c
TT		 5605 if (err)
5606 goto out4;
857ac889 5607
5dabfc78 5608 err = ext4_init_mballoc();
c9de560d
AT		 5609 if (err)
5610 goto out2;
9c191f70
M		 5611 else
5612 ext4_mballoc_ready = 1;
ac27a0ec
DK		 5613 err = init_inodecache();
5614 if (err)
5615 goto out1;
24b58424 5616 register_as_ext3();
2035e776 5617 register_as_ext2();
03010a33 5618 err = register_filesystem(&ext4_fs_type);
ac27a0ec
DK		 5619 if (err)
5620 goto out;
bfff6873 5621
ac27a0ec
DK		 5622 return 0;
5623out:
24b58424
TT		 5624 unregister_as_ext2();
5625 unregister_as_ext3();
ac27a0ec
DK		 5626 destroy_inodecache();
5627out1:
9c191f70 5628 ext4_mballoc_ready = 0;
5dabfc78 5629 ext4_exit_mballoc();
9c191f70 5630out2:
8f021222 5631 ext4_exit_feat_adverts();
dd68314c 5632out4:
d44651d0
FJ		 5633 if (ext4_proc_root)
5634 remove_proc_entry("fs/ext4", NULL);
6fd058f7 5635 kset_unregister(ext4_kset);
d44651d0 5636out5:
5dabfc78 5637 ext4_exit_system_zone();
d44651d0 5638out6:
5dabfc78 5639 ext4_exit_pageio();
51865fda
ZL		 5640out7:
5641 ext4_exit_es();
5642
ac27a0ec
DK		 5643 return err;
5644}
5645
5dabfc78 5646static void __exit ext4_exit_fs(void)
ac27a0ec 5647{
bfff6873 5648 ext4_destroy_lazyinit_thread();
24b58424
TT		 5649 unregister_as_ext2();
5650 unregister_as_ext3();
03010a33 5651 unregister_filesystem(&ext4_fs_type);
ac27a0ec 5652 destroy_inodecache();
5dabfc78 5653 ext4_exit_mballoc();
8f021222 5654 ext4_exit_feat_adverts();
9f6200bb 5655 remove_proc_entry("fs/ext4", NULL);
3197ebdb 5656 kset_unregister(ext4_kset);
5dabfc78
TT		 5657 ext4_exit_system_zone();
5658 ext4_exit_pageio();
dd12ed14 5659 ext4_exit_es();
ac27a0ec
DK		 5660}
5661
5662MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
83982b6f 5663MODULE_DESCRIPTION("Fourth Extended Filesystem");
ac27a0ec 5664MODULE_LICENSE("GPL");
5dabfc78
TT		 5665module_init(ext4_init_fs)
5666module_exit(ext4_exit_fs)
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