]> git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blame - fs/ext4/super.c
projects / mirror_ubuntu-artful-kernel.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
fs/mbcache.c: doucple the locking of local from global data
[mirror_ubuntu-artful-kernel.git] / fs / ext4 / super.c
CommitLineData
ac27a0ec 1/*
617ba13b 2 * linux/fs/ext4/super.c
ac27a0ec
DK		 3 *
4 * Copyright (C) 1992, 1993, 1994, 1995
5 * Remy Card (card@masi.ibp.fr)
6 * Laboratoire MASI - Institut Blaise Pascal
7 * Universite Pierre et Marie Curie (Paris VI)
8 *
9 * from
10 *
11 * linux/fs/minix/inode.c
12 *
13 * Copyright (C) 1991, 1992 Linus Torvalds
14 *
15 * Big-endian to little-endian byte-swapping/bitmaps by
16 * David S. Miller (davem@caip.rutgers.edu), 1995
17 */
18
19#include <linux/module.h>
20#include <linux/string.h>
21#include <linux/fs.h>
22#include <linux/time.h>
c5ca7c76 23#include <linux/vmalloc.h>
dab291af 24#include <linux/jbd2.h>
ac27a0ec
DK		 25#include <linux/slab.h>
26#include <linux/init.h>
27#include <linux/blkdev.h>
28#include <linux/parser.h>
ac27a0ec 29#include <linux/buffer_head.h>
a5694255 30#include <linux/exportfs.h>
ac27a0ec
DK		 31#include <linux/vfs.h>
32#include <linux/random.h>
33#include <linux/mount.h>
34#include <linux/namei.h>
35#include <linux/quotaops.h>
36#include <linux/seq_file.h>
9f6200bb 37#include <linux/proc_fs.h>
3197ebdb 38#include <linux/ctype.h>
1330593e 39#include <linux/log2.h>
717d50e4 40#include <linux/crc16.h>
7abc52c2 41#include <linux/cleancache.h>
ac27a0ec
DK		 42#include <asm/uaccess.h>
43
bfff6873
LC		 44#include <linux/kthread.h>
45#include <linux/freezer.h>
46
3dcf5451 47#include "ext4.h"
4a092d73 48#include "ext4_extents.h" /* Needed for trace points definition */
3dcf5451 49#include "ext4_jbd2.h"
ac27a0ec
DK		 50#include "xattr.h"
51#include "acl.h"
3661d286 52#include "mballoc.h"
ac27a0ec 53
9bffad1e
TT		 54#define CREATE_TRACE_POINTS
55#include <trace/events/ext4.h>
56
1f109d5a 57static struct proc_dir_entry *ext4_proc_root;
3197ebdb 58static struct kset *ext4_kset;
0b75a840
LC		 59static struct ext4_lazy_init *ext4_li_info;
60static struct mutex ext4_li_mtx;
61static struct ext4_features *ext4_feat;
9f6200bb 62
617ba13b 63static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
ac27a0ec 64 unsigned long journal_devnum);
2adf6da8 65static int ext4_show_options(struct seq_file *seq, struct dentry *root);
e2d67052 66static int ext4_commit_super(struct super_block *sb, int sync);
2b2d6d01
TT		 67static void ext4_mark_recovery_complete(struct super_block *sb,
68 struct ext4_super_block *es);
69static void ext4_clear_journal_err(struct super_block *sb,
70 struct ext4_super_block *es);
617ba13b 71static int ext4_sync_fs(struct super_block *sb, int wait);
06a407f1 72static int ext4_sync_fs_nojournal(struct super_block *sb, int wait);
2b2d6d01
TT		 73static int ext4_remount(struct super_block *sb, int *flags, char *data);
74static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
c4be0c1d 75static int ext4_unfreeze(struct super_block *sb);
c4be0c1d 76static int ext4_freeze(struct super_block *sb);
152a0836
AV		 77static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
78 const char *dev_name, void *data);
2035e776
TT		 79static inline int ext2_feature_set_ok(struct super_block *sb);
80static inline int ext3_feature_set_ok(struct super_block *sb);
d39195c3 81static int ext4_feature_set_ok(struct super_block *sb, int readonly);
bfff6873
LC		 82static void ext4_destroy_lazyinit_thread(void);
83static void ext4_unregister_li_request(struct super_block *sb);
8f1f7453 84static void ext4_clear_request_list(void);
27dd4385 85static int ext4_reserve_clusters(struct ext4_sb_info *, ext4_fsblk_t);
ac27a0ec 86
2035e776
TT		 87#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
88static struct file_system_type ext2_fs_type = {
89 .owner = THIS_MODULE,
90 .name = "ext2",
91 .mount = ext4_mount,
92 .kill_sb = kill_block_super,
93 .fs_flags = FS_REQUIRES_DEV,
94};
7f78e035 95MODULE_ALIAS_FS("ext2");
fa7614dd 96MODULE_ALIAS("ext2");
2035e776
TT		 97#define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type)
98#else
99#define IS_EXT2_SB(sb) (0)
100#endif
101
102
ba69f9ab
JK		 103#if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
104static struct file_system_type ext3_fs_type = {
105 .owner = THIS_MODULE,
106 .name = "ext3",
152a0836 107 .mount = ext4_mount,
ba69f9ab
JK		 108 .kill_sb = kill_block_super,
109 .fs_flags = FS_REQUIRES_DEV,
110};
7f78e035 111MODULE_ALIAS_FS("ext3");
fa7614dd 112MODULE_ALIAS("ext3");
ba69f9ab
JK		 113#define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type)
114#else
115#define IS_EXT3_SB(sb) (0)
116#endif
bd81d8ee 117
d25425f8
DW		 118static int ext4_verify_csum_type(struct super_block *sb,
119 struct ext4_super_block *es)
120{
121 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
122 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
123 return 1;
124
125 return es->s_checksum_type == EXT4_CRC32C_CHKSUM;
126}
127
a9c47317
DW		 128static __le32 ext4_superblock_csum(struct super_block *sb,
129 struct ext4_super_block *es)
130{
131 struct ext4_sb_info *sbi = EXT4_SB(sb);
132 int offset = offsetof(struct ext4_super_block, s_checksum);
133 __u32 csum;
134
135 csum = ext4_chksum(sbi, ~0, (char *)es, offset);
136
137 return cpu_to_le32(csum);
138}
139
140int ext4_superblock_csum_verify(struct super_block *sb,
141 struct ext4_super_block *es)
142{
143 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
144 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
145 return 1;
146
147 return es->s_checksum == ext4_superblock_csum(sb, es);
148}
149
06db49e6 150void ext4_superblock_csum_set(struct super_block *sb)
a9c47317 151{
06db49e6
TT		 152 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
153
a9c47317
DW		 154 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
155 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
156 return;
157
158 es->s_checksum = ext4_superblock_csum(sb, es);
159}
160
9933fc0a
TT		 161void *ext4_kvmalloc(size_t size, gfp_t flags)
162{
163 void *ret;
164
8be04b93 165 ret = kmalloc(size, flags | __GFP_NOWARN);
9933fc0a
TT		 166 if (!ret)
167 ret = __vmalloc(size, flags, PAGE_KERNEL);
168 return ret;
169}
170
171void *ext4_kvzalloc(size_t size, gfp_t flags)
172{
173 void *ret;
174
8be04b93 175 ret = kzalloc(size, flags | __GFP_NOWARN);
9933fc0a
TT		 176 if (!ret)
177 ret = __vmalloc(size, flags | __GFP_ZERO, PAGE_KERNEL);
178 return ret;
179}
180
181void ext4_kvfree(void *ptr)
182{
183 if (is_vmalloc_addr(ptr))
184 vfree(ptr);
185 else
186 kfree(ptr);
187
188}
189
8fadc143
AR		 190ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
191 struct ext4_group_desc *bg)
bd81d8ee 192{
3a14589c 193 return le32_to_cpu(bg->bg_block_bitmap_lo) |
8fadc143 194 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 195 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 196}
197
8fadc143
AR		 198ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
199 struct ext4_group_desc *bg)
bd81d8ee 200{
5272f837 201 return le32_to_cpu(bg->bg_inode_bitmap_lo) |
8fadc143 202 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 203 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
bd81d8ee
LV		 204}
205
8fadc143
AR		 206ext4_fsblk_t ext4_inode_table(struct super_block *sb,
207 struct ext4_group_desc *bg)
bd81d8ee 208{
5272f837 209 return le32_to_cpu(bg->bg_inode_table_lo) |
8fadc143 210 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 211 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
bd81d8ee
LV		 212}
213
021b65bb
TT		 214__u32 ext4_free_group_clusters(struct super_block *sb,
215 struct ext4_group_desc *bg)
560671a0
AK		 216{
217 return le16_to_cpu(bg->bg_free_blocks_count_lo) |
218 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 219 (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0);
560671a0
AK		 220}
221
222__u32 ext4_free_inodes_count(struct super_block *sb,
223 struct ext4_group_desc *bg)
224{
225 return le16_to_cpu(bg->bg_free_inodes_count_lo) |
226 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 227 (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0);
560671a0
AK		 228}
229
230__u32 ext4_used_dirs_count(struct super_block *sb,
231 struct ext4_group_desc *bg)
232{
233 return le16_to_cpu(bg->bg_used_dirs_count_lo) |
234 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 235 (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0);
560671a0
AK		 236}
237
238__u32 ext4_itable_unused_count(struct super_block *sb,
239 struct ext4_group_desc *bg)
240{
241 return le16_to_cpu(bg->bg_itable_unused_lo) |
242 (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
0b8e58a1 243 (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0);
560671a0
AK		 244}
245
8fadc143
AR		 246void ext4_block_bitmap_set(struct super_block *sb,
247 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 248{
3a14589c 249 bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 250 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
251 bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 252}
253
8fadc143
AR		 254void ext4_inode_bitmap_set(struct super_block *sb,
255 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 256{
5272f837 257 bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 258 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
259 bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 260}
261
8fadc143
AR		 262void ext4_inode_table_set(struct super_block *sb,
263 struct ext4_group_desc *bg, ext4_fsblk_t blk)
bd81d8ee 264{
5272f837 265 bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
8fadc143
AR		 266 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
267 bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
bd81d8ee
LV		 268}
269
021b65bb
TT		 270void ext4_free_group_clusters_set(struct super_block *sb,
271 struct ext4_group_desc *bg, __u32 count)
560671a0
AK		 272{
273 bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count);
274 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
275 bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16);
276}
277
278void ext4_free_inodes_set(struct super_block *sb,
279 struct ext4_group_desc *bg, __u32 count)
280{
281 bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count);
282 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
283 bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16);
284}
285
286void ext4_used_dirs_set(struct super_block *sb,
287 struct ext4_group_desc *bg, __u32 count)
288{
289 bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count);
290 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
291 bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16);
292}
293
294void ext4_itable_unused_set(struct super_block *sb,
295 struct ext4_group_desc *bg, __u32 count)
296{
297 bg->bg_itable_unused_lo = cpu_to_le16((__u16)count);
298 if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
299 bg->bg_itable_unused_hi = cpu_to_le16(count >> 16);
300}
301
d3d1faf6 302
1c13d5c0
TT		 303static void __save_error_info(struct super_block *sb, const char *func,
304 unsigned int line)
305{
306 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
307
308 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
309 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
310 es->s_last_error_time = cpu_to_le32(get_seconds());
311 strncpy(es->s_last_error_func, func, sizeof(es->s_last_error_func));
312 es->s_last_error_line = cpu_to_le32(line);
313 if (!es->s_first_error_time) {
314 es->s_first_error_time = es->s_last_error_time;
315 strncpy(es->s_first_error_func, func,
316 sizeof(es->s_first_error_func));
317 es->s_first_error_line = cpu_to_le32(line);
318 es->s_first_error_ino = es->s_last_error_ino;
319 es->s_first_error_block = es->s_last_error_block;
320 }
66e61a9e
TT		 321 /*
322 * Start the daily error reporting function if it hasn't been
323 * started already
324 */
325 if (!es->s_error_count)
326 mod_timer(&EXT4_SB(sb)->s_err_report, jiffies + 24*60*60*HZ);
ba39ebb6 327 le32_add_cpu(&es->s_error_count, 1);
1c13d5c0
TT		 328}
329
330static void save_error_info(struct super_block *sb, const char *func,
331 unsigned int line)
332{
333 __save_error_info(sb, func, line);
334 ext4_commit_super(sb, 1);
335}
336
7c2e7087
TT		 337/*
338 * The del_gendisk() function uninitializes the disk-specific data
339 * structures, including the bdi structure, without telling anyone
340 * else. Once this happens, any attempt to call mark_buffer_dirty()
341 * (for example, by ext4_commit_super), will cause a kernel OOPS.
342 * This is a kludge to prevent these oops until we can put in a proper
343 * hook in del_gendisk() to inform the VFS and file system layers.
344 */
345static int block_device_ejected(struct super_block *sb)
346{
347 struct inode *bd_inode = sb->s_bdev->bd_inode;
348 struct backing_dev_info *bdi = bd_inode->i_mapping->backing_dev_info;
349
350 return bdi->dev == NULL;
351}
352
18aadd47
BJ		 353static void ext4_journal_commit_callback(journal_t *journal, transaction_t *txn)
354{
355 struct super_block *sb = journal->j_private;
356 struct ext4_sb_info *sbi = EXT4_SB(sb);
357 int error = is_journal_aborted(journal);
5d3ee208 358 struct ext4_journal_cb_entry *jce;
18aadd47 359
5d3ee208 360 BUG_ON(txn->t_state == T_FINISHED);
18aadd47 361 spin_lock(&sbi->s_md_lock);
5d3ee208
DM		 362 while (!list_empty(&txn->t_private_list)) {
363 jce = list_entry(txn->t_private_list.next,
364 struct ext4_journal_cb_entry, jce_list);
18aadd47
BJ		 365 list_del_init(&jce->jce_list);
366 spin_unlock(&sbi->s_md_lock);
367 jce->jce_func(sb, jce, error);
368 spin_lock(&sbi->s_md_lock);
369 }
370 spin_unlock(&sbi->s_md_lock);
371}
1c13d5c0 372
ac27a0ec
DK		 373/* Deal with the reporting of failure conditions on a filesystem such as
374 * inconsistencies detected or read IO failures.
375 *
376 * On ext2, we can store the error state of the filesystem in the
617ba13b 377 * superblock. That is not possible on ext4, because we may have other
ac27a0ec
DK		 378 * write ordering constraints on the superblock which prevent us from
379 * writing it out straight away; and given that the journal is about to
380 * be aborted, we can't rely on the current, or future, transactions to
381 * write out the superblock safely.
382 *
dab291af 383 * We'll just use the jbd2_journal_abort() error code to record an error in
d6b198bc 384 * the journal instead. On recovery, the journal will complain about
ac27a0ec
DK		 385 * that error until we've noted it down and cleared it.
386 */
387
617ba13b 388static void ext4_handle_error(struct super_block *sb)
ac27a0ec 389{
ac27a0ec
DK		 390 if (sb->s_flags & MS_RDONLY)
391 return;
392
2b2d6d01 393 if (!test_opt(sb, ERRORS_CONT)) {
617ba13b 394 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 395
4ab2f15b 396 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
ac27a0ec 397 if (journal)
dab291af 398 jbd2_journal_abort(journal, -EIO);
ac27a0ec 399 }
2b2d6d01 400 if (test_opt(sb, ERRORS_RO)) {
b31e1552 401 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
4418e141
DM		 402 /*
403 * Make sure updated value of ->s_mount_flags will be visible
404 * before ->s_flags update
405 */
406 smp_wmb();
ac27a0ec
DK		 407 sb->s_flags |= MS_RDONLY;
408 }
ac27a0ec 409 if (test_opt(sb, ERRORS_PANIC))
617ba13b 410 panic("EXT4-fs (device %s): panic forced after error\n",
ac27a0ec
DK		 411 sb->s_id);
412}
413
efbed4dc
TT		 414#define ext4_error_ratelimit(sb) \
415 ___ratelimit(&(EXT4_SB(sb)->s_err_ratelimit_state), \
416 "EXT4-fs error")
417
12062ddd 418void __ext4_error(struct super_block *sb, const char *function,
c398eda0 419 unsigned int line, const char *fmt, ...)
ac27a0ec 420{
0ff2ea7d 421 struct va_format vaf;
ac27a0ec
DK		 422 va_list args;
423
efbed4dc
TT		 424 if (ext4_error_ratelimit(sb)) {
425 va_start(args, fmt);
426 vaf.fmt = fmt;
427 vaf.va = &args;
428 printk(KERN_CRIT
429 "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n",
430 sb->s_id, function, line, current->comm, &vaf);
431 va_end(args);
432 }
f3fc0210 433 save_error_info(sb, function, line);
617ba13b 434 ext4_handle_error(sb);
ac27a0ec
DK		 435}
436
e7c96e8e
JP		 437void __ext4_error_inode(struct inode *inode, const char *function,
438 unsigned int line, ext4_fsblk_t block,
439 const char *fmt, ...)
273df556
FM		 440{
441 va_list args;
f7c21177 442 struct va_format vaf;
1c13d5c0 443 struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
273df556 444
1c13d5c0
TT		 445 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
446 es->s_last_error_block = cpu_to_le64(block);
efbed4dc
TT		 447 if (ext4_error_ratelimit(inode->i_sb)) {
448 va_start(args, fmt);
449 vaf.fmt = fmt;
450 vaf.va = &args;
451 if (block)
452 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
453 "inode #%lu: block %llu: comm %s: %pV\n",
454 inode->i_sb->s_id, function, line, inode->i_ino,
455 block, current->comm, &vaf);
456 else
457 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
458 "inode #%lu: comm %s: %pV\n",
459 inode->i_sb->s_id, function, line, inode->i_ino,
460 current->comm, &vaf);
461 va_end(args);
462 }
1c13d5c0 463 save_error_info(inode->i_sb, function, line);
273df556
FM		 464 ext4_handle_error(inode->i_sb);
465}
466
e7c96e8e
JP		 467void __ext4_error_file(struct file *file, const char *function,
468 unsigned int line, ext4_fsblk_t block,
469 const char *fmt, ...)
273df556
FM		 470{
471 va_list args;
f7c21177 472 struct va_format vaf;
1c13d5c0 473 struct ext4_super_block *es;
496ad9aa 474 struct inode *inode = file_inode(file);
273df556
FM		 475 char pathname[80], *path;
476
1c13d5c0
TT		 477 es = EXT4_SB(inode->i_sb)->s_es;
478 es->s_last_error_ino = cpu_to_le32(inode->i_ino);
efbed4dc
TT		 479 if (ext4_error_ratelimit(inode->i_sb)) {
480 path = d_path(&(file->f_path), pathname, sizeof(pathname));
481 if (IS_ERR(path))
482 path = "(unknown)";
483 va_start(args, fmt);
484 vaf.fmt = fmt;
485 vaf.va = &args;
486 if (block)
487 printk(KERN_CRIT
488 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
489 "block %llu: comm %s: path %s: %pV\n",
490 inode->i_sb->s_id, function, line, inode->i_ino,
491 block, current->comm, path, &vaf);
492 else
493 printk(KERN_CRIT
494 "EXT4-fs error (device %s): %s:%d: inode #%lu: "
495 "comm %s: path %s: %pV\n",
496 inode->i_sb->s_id, function, line, inode->i_ino,
497 current->comm, path, &vaf);
498 va_end(args);
499 }
1c13d5c0 500 save_error_info(inode->i_sb, function, line);
273df556
FM		 501 ext4_handle_error(inode->i_sb);
502}
503
722887dd
TT		 504const char *ext4_decode_error(struct super_block *sb, int errno,
505 char nbuf[16])
ac27a0ec
DK		 506{
507 char *errstr = NULL;
508
509 switch (errno) {
510 case -EIO:
511 errstr = "IO failure";
512 break;
513 case -ENOMEM:
514 errstr = "Out of memory";
515 break;
516 case -EROFS:
78f1ddbb
TT		 517 if (!sb || (EXT4_SB(sb)->s_journal &&
518 EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT))
ac27a0ec
DK		 519 errstr = "Journal has aborted";
520 else
521 errstr = "Readonly filesystem";
522 break;
523 default:
524 /* If the caller passed in an extra buffer for unknown
525 * errors, textualise them now. Else we just return
526 * NULL. */
527 if (nbuf) {
528 /* Check for truncated error codes... */
529 if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
530 errstr = nbuf;
531 }
532 break;
533 }
534
535 return errstr;
536}
537
617ba13b 538/* __ext4_std_error decodes expected errors from journaling functions
ac27a0ec
DK		 539 * automatically and invokes the appropriate error response. */
540
c398eda0
TT		 541void __ext4_std_error(struct super_block *sb, const char *function,
542 unsigned int line, int errno)
ac27a0ec
DK		 543{
544 char nbuf[16];
545 const char *errstr;
546
547 /* Special case: if the error is EROFS, and we're not already
548 * inside a transaction, then there's really no point in logging
549 * an error. */
550 if (errno == -EROFS && journal_current_handle() == NULL &&
551 (sb->s_flags & MS_RDONLY))
552 return;
553
efbed4dc
TT		 554 if (ext4_error_ratelimit(sb)) {
555 errstr = ext4_decode_error(sb, errno, nbuf);
556 printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n",
557 sb->s_id, function, line, errstr);
558 }
ac27a0ec 559
efbed4dc 560 save_error_info(sb, function, line);
617ba13b 561 ext4_handle_error(sb);
ac27a0ec
DK		 562}
563
564/*
617ba13b 565 * ext4_abort is a much stronger failure handler than ext4_error. The
ac27a0ec
DK		 566 * abort function may be used to deal with unrecoverable failures such
567 * as journal IO errors or ENOMEM at a critical moment in log management.
568 *
569 * We unconditionally force the filesystem into an ABORT|READONLY state,
570 * unless the error response on the fs has been set to panic in which
571 * case we take the easy way out and panic immediately.
572 */
573
c67d859e 574void __ext4_abort(struct super_block *sb, const char *function,
c398eda0 575 unsigned int line, const char *fmt, ...)
ac27a0ec
DK		 576{
577 va_list args;
578
1c13d5c0 579 save_error_info(sb, function, line);
ac27a0ec 580 va_start(args, fmt);
c398eda0
TT		 581 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: ", sb->s_id,
582 function, line);
ac27a0ec
DK		 583 vprintk(fmt, args);
584 printk("\n");
585 va_end(args);
586
1c13d5c0
TT		 587 if ((sb->s_flags & MS_RDONLY) == 0) {
588 ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
1c13d5c0 589 EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
4418e141
DM		 590 /*
591 * Make sure updated value of ->s_mount_flags will be visible
592 * before ->s_flags update
593 */
594 smp_wmb();
595 sb->s_flags |= MS_RDONLY;
1c13d5c0
TT		 596 if (EXT4_SB(sb)->s_journal)
597 jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
598 save_error_info(sb, function, line);
599 }
ac27a0ec 600 if (test_opt(sb, ERRORS_PANIC))
617ba13b 601 panic("EXT4-fs panic from previous error\n");
ac27a0ec
DK		 602}
603
e7c96e8e
JP		 604void __ext4_msg(struct super_block *sb,
605 const char *prefix, const char *fmt, ...)
b31e1552 606{
0ff2ea7d 607 struct va_format vaf;
b31e1552
ES		 608 va_list args;
609
efbed4dc
TT		 610 if (!___ratelimit(&(EXT4_SB(sb)->s_msg_ratelimit_state), "EXT4-fs"))
611 return;
612
b31e1552 613 va_start(args, fmt);
0ff2ea7d
JP		 614 vaf.fmt = fmt;
615 vaf.va = &args;
616 printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
b31e1552
ES		 617 va_end(args);
618}
619
12062ddd 620void __ext4_warning(struct super_block *sb, const char *function,
c398eda0 621 unsigned int line, const char *fmt, ...)
ac27a0ec 622{
0ff2ea7d 623 struct va_format vaf;
ac27a0ec
DK		 624 va_list args;
625
efbed4dc
TT		 626 if (!___ratelimit(&(EXT4_SB(sb)->s_warning_ratelimit_state),
627 "EXT4-fs warning"))
628 return;
629
ac27a0ec 630 va_start(args, fmt);
0ff2ea7d
JP		 631 vaf.fmt = fmt;
632 vaf.va = &args;
633 printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: %pV\n",
634 sb->s_id, function, line, &vaf);
ac27a0ec
DK		 635 va_end(args);
636}
637
e29136f8
TT		 638void __ext4_grp_locked_error(const char *function, unsigned int line,
639 struct super_block *sb, ext4_group_t grp,
640 unsigned long ino, ext4_fsblk_t block,
641 const char *fmt, ...)
5d1b1b3f
AK		 642__releases(bitlock)
643__acquires(bitlock)
644{
0ff2ea7d 645 struct va_format vaf;
5d1b1b3f
AK		 646 va_list args;
647 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
648
1c13d5c0
TT		 649 es->s_last_error_ino = cpu_to_le32(ino);
650 es->s_last_error_block = cpu_to_le64(block);
651 __save_error_info(sb, function, line);
0ff2ea7d 652
efbed4dc
TT		 653 if (ext4_error_ratelimit(sb)) {
654 va_start(args, fmt);
655 vaf.fmt = fmt;
656 vaf.va = &args;
657 printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u, ",
658 sb->s_id, function, line, grp);
659 if (ino)
660 printk(KERN_CONT "inode %lu: ", ino);
661 if (block)
662 printk(KERN_CONT "block %llu:",
663 (unsigned long long) block);
664 printk(KERN_CONT "%pV\n", &vaf);
665 va_end(args);
666 }
5d1b1b3f
AK		 667
668 if (test_opt(sb, ERRORS_CONT)) {
e2d67052 669 ext4_commit_super(sb, 0);
5d1b1b3f
AK		 670 return;
671 }
1c13d5c0 672
5d1b1b3f
AK		 673 ext4_unlock_group(sb, grp);
674 ext4_handle_error(sb);
675 /*
676 * We only get here in the ERRORS_RO case; relocking the group
677 * may be dangerous, but nothing bad will happen since the
678 * filesystem will have already been marked read/only and the
679 * journal has been aborted. We return 1 as a hint to callers
680 * who might what to use the return value from
25985edc 681 * ext4_grp_locked_error() to distinguish between the
5d1b1b3f
AK		 682 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
683 * aggressively from the ext4 function in question, with a
684 * more appropriate error code.
685 */
686 ext4_lock_group(sb, grp);
687 return;
688}
689
617ba13b 690void ext4_update_dynamic_rev(struct super_block *sb)
ac27a0ec 691{
617ba13b 692 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
ac27a0ec 693
617ba13b 694 if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
ac27a0ec
DK		 695 return;
696
12062ddd 697 ext4_warning(sb,
ac27a0ec
DK		 698 "updating to rev %d because of new feature flag, "
699 "running e2fsck is recommended",
617ba13b 700 EXT4_DYNAMIC_REV);
ac27a0ec 701
617ba13b
MC		 702 es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
703 es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
704 es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
ac27a0ec
DK		 705 /* leave es->s_feature_*compat flags alone */
706 /* es->s_uuid will be set by e2fsck if empty */
707
708 /*
709 * The rest of the superblock fields should be zero, and if not it
710 * means they are likely already in use, so leave them alone. We
711 * can leave it up to e2fsck to clean up any inconsistencies there.
712 */
713}
714
715/*
716 * Open the external journal device
717 */
b31e1552 718static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb)
ac27a0ec
DK		 719{
720 struct block_device *bdev;
721 char b[BDEVNAME_SIZE];
722
d4d77629 723 bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
ac27a0ec
DK		 724 if (IS_ERR(bdev))
725 goto fail;
726 return bdev;
727
728fail:
b31e1552 729 ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld",
ac27a0ec
DK		 730 __bdevname(dev, b), PTR_ERR(bdev));
731 return NULL;
732}
733
734/*
735 * Release the journal device
736 */
4385bab1 737static void ext4_blkdev_put(struct block_device *bdev)
ac27a0ec 738{
4385bab1 739 blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
ac27a0ec
DK		 740}
741
4385bab1 742static void ext4_blkdev_remove(struct ext4_sb_info *sbi)
ac27a0ec
DK		 743{
744 struct block_device *bdev;
ac27a0ec
DK		 745 bdev = sbi->journal_bdev;
746 if (bdev) {
4385bab1 747 ext4_blkdev_put(bdev);
ac27a0ec
DK		 748 sbi->journal_bdev = NULL;
749 }
ac27a0ec
DK		 750}
751
752static inline struct inode *orphan_list_entry(struct list_head *l)
753{
617ba13b 754 return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
ac27a0ec
DK		 755}
756
617ba13b 757static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
ac27a0ec
DK		 758{
759 struct list_head *l;
760
b31e1552
ES		 761 ext4_msg(sb, KERN_ERR, "sb orphan head is %d",
762 le32_to_cpu(sbi->s_es->s_last_orphan));
ac27a0ec
DK		 763
764 printk(KERN_ERR "sb_info orphan list:\n");
765 list_for_each(l, &sbi->s_orphan) {
766 struct inode *inode = orphan_list_entry(l);
767 printk(KERN_ERR " "
768 "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
769 inode->i_sb->s_id, inode->i_ino, inode,
770 inode->i_mode, inode->i_nlink,
771 NEXT_ORPHAN(inode));
772 }
773}
774
2b2d6d01 775static void ext4_put_super(struct super_block *sb)
ac27a0ec 776{
617ba13b
MC		 777 struct ext4_sb_info *sbi = EXT4_SB(sb);
778 struct ext4_super_block *es = sbi->s_es;
ef2cabf7 779 int i, err;
ac27a0ec 780
857ac889 781 ext4_unregister_li_request(sb);
e0ccfd95
CH		 782 dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);
783
2e8fa54e 784 flush_workqueue(sbi->rsv_conversion_wq);
2e8fa54e 785 destroy_workqueue(sbi->rsv_conversion_wq);
4c0425ff 786
0390131b
FM		 787 if (sbi->s_journal) {
788 err = jbd2_journal_destroy(sbi->s_journal);
789 sbi->s_journal = NULL;
790 if (err < 0)
c67d859e 791 ext4_abort(sb, "Couldn't clean up the journal");
0390131b 792 }
d4edac31 793
d3922a77 794 ext4_es_unregister_shrinker(sbi);
9105bb14 795 del_timer_sync(&sbi->s_err_report);
d4edac31
JB		 796 ext4_release_system_zone(sb);
797 ext4_mb_release(sb);
798 ext4_ext_release(sb);
799 ext4_xattr_put_super(sb);
800
ac27a0ec 801 if (!(sb->s_flags & MS_RDONLY)) {
617ba13b 802 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
ac27a0ec 803 es->s_state = cpu_to_le16(sbi->s_mount_state);
ac27a0ec 804 }
58c5873a 805 if (!(sb->s_flags & MS_RDONLY))
a8e25a83
AB		 806 ext4_commit_super(sb, 1);
807
240799cd 808 if (sbi->s_proc) {
66acdcf4 809 remove_proc_entry("options", sbi->s_proc);
9f6200bb 810 remove_proc_entry(sb->s_id, ext4_proc_root);
240799cd 811 }
3197ebdb 812 kobject_del(&sbi->s_kobj);
ac27a0ec
DK		 813
814 for (i = 0; i < sbi->s_gdb_count; i++)
815 brelse(sbi->s_group_desc[i]);
f18a5f21 816 ext4_kvfree(sbi->s_group_desc);
9933fc0a 817 ext4_kvfree(sbi->s_flex_groups);
57042651 818 percpu_counter_destroy(&sbi->s_freeclusters_counter);
ac27a0ec
DK		 819 percpu_counter_destroy(&sbi->s_freeinodes_counter);
820 percpu_counter_destroy(&sbi->s_dirs_counter);
57042651 821 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
1ac6466f 822 percpu_counter_destroy(&sbi->s_extent_cache_cnt);
ac27a0ec
DK		 823 brelse(sbi->s_sbh);
824#ifdef CONFIG_QUOTA
825 for (i = 0; i < MAXQUOTAS; i++)
826 kfree(sbi->s_qf_names[i]);
827#endif
828
829 /* Debugging code just in case the in-memory inode orphan list
830 * isn't empty. The on-disk one can be non-empty if we've
831 * detected an error and taken the fs readonly, but the
832 * in-memory list had better be clean by this point. */
833 if (!list_empty(&sbi->s_orphan))
834 dump_orphan_list(sb, sbi);
835 J_ASSERT(list_empty(&sbi->s_orphan));
836
f98393a6 837 invalidate_bdev(sb->s_bdev);
ac27a0ec
DK		 838 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
839 /*
840 * Invalidate the journal device's buffers. We don't want them
841 * floating about in memory - the physical journal device may
842 * hotswapped, and it breaks the `ro-after' testing code.
843 */
844 sync_blockdev(sbi->journal_bdev);
f98393a6 845 invalidate_bdev(sbi->journal_bdev);
617ba13b 846 ext4_blkdev_remove(sbi);
ac27a0ec 847 }
c5e06d10
JL		 848 if (sbi->s_mmp_tsk)
849 kthread_stop(sbi->s_mmp_tsk);
ac27a0ec 850 sb->s_fs_info = NULL;
3197ebdb
TT		 851 /*
852 * Now that we are completely done shutting down the
853 * superblock, we need to actually destroy the kobject.
854 */
3197ebdb
TT		 855 kobject_put(&sbi->s_kobj);
856 wait_for_completion(&sbi->s_kobj_unregister);
0441984a
DW		 857 if (sbi->s_chksum_driver)
858 crypto_free_shash(sbi->s_chksum_driver);
705895b6 859 kfree(sbi->s_blockgroup_lock);
ac27a0ec 860 kfree(sbi);
ac27a0ec
DK		 861}
862
e18b890b 863static struct kmem_cache *ext4_inode_cachep;
ac27a0ec
DK		 864
865/*
866 * Called inside transaction, so use GFP_NOFS
867 */
617ba13b 868static struct inode *ext4_alloc_inode(struct super_block *sb)
ac27a0ec 869{
617ba13b 870 struct ext4_inode_info *ei;
ac27a0ec 871
e6b4f8da 872 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
ac27a0ec
DK		 873 if (!ei)
874 return NULL;
0b8e58a1 875
ac27a0ec 876 ei->vfs_inode.i_version = 1;
c9de560d
AT		 877 INIT_LIST_HEAD(&ei->i_prealloc_list);
878 spin_lock_init(&ei->i_prealloc_lock);
9a26b661
ZL		 879 ext4_es_init_tree(&ei->i_es_tree);
880 rwlock_init(&ei->i_es_lock);
74cd15cd
ZL		 881 INIT_LIST_HEAD(&ei->i_es_lru);
882 ei->i_es_lru_nr = 0;
d3922a77 883 ei->i_touch_when = 0;
d2a17637
MC		 884 ei->i_reserved_data_blocks = 0;
885 ei->i_reserved_meta_blocks = 0;
886 ei->i_allocated_meta_blocks = 0;
9d0be502 887 ei->i_da_metadata_calc_len = 0;
7e731bc9 888 ei->i_da_metadata_calc_last_lblock = 0;
d2a17637 889 spin_lock_init(&(ei->i_block_reservation_lock));
a9e7f447
DM		 890#ifdef CONFIG_QUOTA
891 ei->i_reserved_quota = 0;
892#endif
8aefcd55 893 ei->jinode = NULL;
2e8fa54e 894 INIT_LIST_HEAD(&ei->i_rsv_conversion_list);
744692dc 895 spin_lock_init(&ei->i_completed_io_lock);
b436b9be
JK		 896 ei->i_sync_tid = 0;
897 ei->i_datasync_tid = 0;
f7ad6d2e 898 atomic_set(&ei->i_ioend_count, 0);
e27f41e1 899 atomic_set(&ei->i_unwritten, 0);
2e8fa54e 900 INIT_WORK(&ei->i_rsv_conversion_work, ext4_end_io_rsv_work);
0b8e58a1 901
ac27a0ec
DK		 902 return &ei->vfs_inode;
903}
904
7ff9c073
TT		 905static int ext4_drop_inode(struct inode *inode)
906{
907 int drop = generic_drop_inode(inode);
908
909 trace_ext4_drop_inode(inode, drop);
910 return drop;
911}
912
fa0d7e3d
NP		 913static void ext4_i_callback(struct rcu_head *head)
914{
915 struct inode *inode = container_of(head, struct inode, i_rcu);
fa0d7e3d
NP		 916 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
917}
918
617ba13b 919static void ext4_destroy_inode(struct inode *inode)
ac27a0ec 920{
9f7dd93d 921 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
b31e1552
ES		 922 ext4_msg(inode->i_sb, KERN_ERR,
923 "Inode %lu (%p): orphan list check failed!",
924 inode->i_ino, EXT4_I(inode));
9f7dd93d
VA		 925 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
926 EXT4_I(inode), sizeof(struct ext4_inode_info),
927 true);
928 dump_stack();
929 }
fa0d7e3d 930 call_rcu(&inode->i_rcu, ext4_i_callback);
ac27a0ec
DK		 931}
932
51cc5068 933static void init_once(void *foo)
ac27a0ec 934{
617ba13b 935 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
ac27a0ec 936
a35afb83 937 INIT_LIST_HEAD(&ei->i_orphan);
a35afb83 938 init_rwsem(&ei->xattr_sem);
0e855ac8 939 init_rwsem(&ei->i_data_sem);
a35afb83 940 inode_init_once(&ei->vfs_inode);
ac27a0ec
DK		 941}
942
e67bc2b3 943static int __init init_inodecache(void)
ac27a0ec 944{
617ba13b
MC		 945 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
946 sizeof(struct ext4_inode_info),
ac27a0ec
DK		 947 0, (SLAB_RECLAIM_ACCOUNT|
948 SLAB_MEM_SPREAD),
20c2df83 949 init_once);
617ba13b 950 if (ext4_inode_cachep == NULL)
ac27a0ec
DK		 951 return -ENOMEM;
952 return 0;
953}
954
955static void destroy_inodecache(void)
956{
8c0a8537
KS		 957 /*
958 * Make sure all delayed rcu free inodes are flushed before we
959 * destroy cache.
960 */
961 rcu_barrier();
617ba13b 962 kmem_cache_destroy(ext4_inode_cachep);
ac27a0ec
DK		 963}
964
0930fcc1 965void ext4_clear_inode(struct inode *inode)
ac27a0ec 966{
0930fcc1 967 invalidate_inode_buffers(inode);
dbd5768f 968 clear_inode(inode);
9f754758 969 dquot_drop(inode);
c2ea3fde 970 ext4_discard_preallocations(inode);
51865fda 971 ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS);
74cd15cd 972 ext4_es_lru_del(inode);
8aefcd55
TT		 973 if (EXT4_I(inode)->jinode) {
974 jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode),
975 EXT4_I(inode)->jinode);
976 jbd2_free_inode(EXT4_I(inode)->jinode);
977 EXT4_I(inode)->jinode = NULL;
978 }
ac27a0ec
DK		 979}
980
1b961ac0 981static struct inode *ext4_nfs_get_inode(struct super_block *sb,
0b8e58a1 982 u64 ino, u32 generation)
ac27a0ec 983{
ac27a0ec 984 struct inode *inode;
ac27a0ec 985
617ba13b 986 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
ac27a0ec 987 return ERR_PTR(-ESTALE);
617ba13b 988 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
ac27a0ec
DK		 989 return ERR_PTR(-ESTALE);
990
991 /* iget isn't really right if the inode is currently unallocated!!
992 *
617ba13b 993 * ext4_read_inode will return a bad_inode if the inode had been
ac27a0ec
DK		 994 * deleted, so we should be safe.
995 *
996 * Currently we don't know the generation for parent directory, so
997 * a generation of 0 means "accept any"
998 */
1d1fe1ee
DH		 999 inode = ext4_iget(sb, ino);
1000 if (IS_ERR(inode))
1001 return ERR_CAST(inode);
1002 if (generation && inode->i_generation != generation) {
ac27a0ec
DK		 1003 iput(inode);
1004 return ERR_PTR(-ESTALE);
1005 }
1b961ac0
CH		 1006
1007 return inode;
1008}
1009
1010static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
0b8e58a1 1011 int fh_len, int fh_type)
1b961ac0
CH		 1012{
1013 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
1014 ext4_nfs_get_inode);
1015}
1016
1017static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
0b8e58a1 1018 int fh_len, int fh_type)
1b961ac0
CH		 1019{
1020 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
1021 ext4_nfs_get_inode);
ac27a0ec
DK		 1022}
1023
c39a7f84
TO		 1024/*
1025 * Try to release metadata pages (indirect blocks, directories) which are
1026 * mapped via the block device. Since these pages could have journal heads
1027 * which would prevent try_to_free_buffers() from freeing them, we must use
1028 * jbd2 layer's try_to_free_buffers() function to release them.
1029 */
0b8e58a1
AD		 1030static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
1031 gfp_t wait)
c39a7f84
TO		 1032{
1033 journal_t *journal = EXT4_SB(sb)->s_journal;
1034
1035 WARN_ON(PageChecked(page));
1036 if (!page_has_buffers(page))
1037 return 0;
1038 if (journal)
1039 return jbd2_journal_try_to_free_buffers(journal, page,
1040 wait & ~__GFP_WAIT);
1041 return try_to_free_buffers(page);
1042}
1043
ac27a0ec 1044#ifdef CONFIG_QUOTA
af5bc92d 1045#define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
2b2d6d01 1046#define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
ac27a0ec 1047
617ba13b
MC		 1048static int ext4_write_dquot(struct dquot *dquot);
1049static int ext4_acquire_dquot(struct dquot *dquot);
1050static int ext4_release_dquot(struct dquot *dquot);
1051static int ext4_mark_dquot_dirty(struct dquot *dquot);
1052static int ext4_write_info(struct super_block *sb, int type);
6f28e087 1053static int ext4_quota_on(struct super_block *sb, int type, int format_id,
f00c9e44 1054 struct path *path);
7c319d32
AK		 1055static int ext4_quota_on_sysfile(struct super_block *sb, int type,
1056 int format_id);
ca0e05e4 1057static int ext4_quota_off(struct super_block *sb, int type);
7c319d32 1058static int ext4_quota_off_sysfile(struct super_block *sb, int type);
617ba13b
MC		 1059static int ext4_quota_on_mount(struct super_block *sb, int type);
1060static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec 1061 size_t len, loff_t off);
617ba13b 1062static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec 1063 const char *data, size_t len, loff_t off);
7c319d32
AK		 1064static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
1065 unsigned int flags);
1066static int ext4_enable_quotas(struct super_block *sb);
ac27a0ec 1067
61e225dc 1068static const struct dquot_operations ext4_quota_operations = {
60e58e0f 1069 .get_reserved_space = ext4_get_reserved_space,
617ba13b
MC		 1070 .write_dquot = ext4_write_dquot,
1071 .acquire_dquot = ext4_acquire_dquot,
1072 .release_dquot = ext4_release_dquot,
1073 .mark_dirty = ext4_mark_dquot_dirty,
a5b5ee32
JK		 1074 .write_info = ext4_write_info,
1075 .alloc_dquot = dquot_alloc,
1076 .destroy_dquot = dquot_destroy,
ac27a0ec
DK		 1077};
1078
0d54b217 1079static const struct quotactl_ops ext4_qctl_operations = {
617ba13b 1080 .quota_on = ext4_quota_on,
ca0e05e4 1081 .quota_off = ext4_quota_off,
287a8095
CH		 1082 .quota_sync = dquot_quota_sync,
1083 .get_info = dquot_get_dqinfo,
1084 .set_info = dquot_set_dqinfo,
1085 .get_dqblk = dquot_get_dqblk,
1086 .set_dqblk = dquot_set_dqblk
ac27a0ec 1087};
7c319d32
AK		 1088
1089static const struct quotactl_ops ext4_qctl_sysfile_operations = {
1090 .quota_on_meta = ext4_quota_on_sysfile,
1091 .quota_off = ext4_quota_off_sysfile,
1092 .quota_sync = dquot_quota_sync,
1093 .get_info = dquot_get_dqinfo,
1094 .set_info = dquot_set_dqinfo,
1095 .get_dqblk = dquot_get_dqblk,
1096 .set_dqblk = dquot_set_dqblk
1097};
ac27a0ec
DK		 1098#endif
1099
ee9b6d61 1100static const struct super_operations ext4_sops = {
617ba13b
MC		 1101 .alloc_inode = ext4_alloc_inode,
1102 .destroy_inode = ext4_destroy_inode,
617ba13b
MC		 1103 .write_inode = ext4_write_inode,
1104 .dirty_inode = ext4_dirty_inode,
7ff9c073 1105 .drop_inode = ext4_drop_inode,
0930fcc1 1106 .evict_inode = ext4_evict_inode,
617ba13b 1107 .put_super = ext4_put_super,
617ba13b 1108 .sync_fs = ext4_sync_fs,
c4be0c1d
TS		 1109 .freeze_fs = ext4_freeze,
1110 .unfreeze_fs = ext4_unfreeze,
617ba13b
MC		 1111 .statfs = ext4_statfs,
1112 .remount_fs = ext4_remount,
617ba13b 1113 .show_options = ext4_show_options,
ac27a0ec 1114#ifdef CONFIG_QUOTA
617ba13b
MC		 1115 .quota_read = ext4_quota_read,
1116 .quota_write = ext4_quota_write,
ac27a0ec 1117#endif
c39a7f84 1118 .bdev_try_to_free_page = bdev_try_to_free_page,
ac27a0ec
DK		 1119};
1120
9ca92389
TT		 1121static const struct super_operations ext4_nojournal_sops = {
1122 .alloc_inode = ext4_alloc_inode,
1123 .destroy_inode = ext4_destroy_inode,
1124 .write_inode = ext4_write_inode,
1125 .dirty_inode = ext4_dirty_inode,
7ff9c073 1126 .drop_inode = ext4_drop_inode,
0930fcc1 1127 .evict_inode = ext4_evict_inode,
06a407f1 1128 .sync_fs = ext4_sync_fs_nojournal,
9ca92389
TT		 1129 .put_super = ext4_put_super,
1130 .statfs = ext4_statfs,
1131 .remount_fs = ext4_remount,
9ca92389
TT		 1132 .show_options = ext4_show_options,
1133#ifdef CONFIG_QUOTA
1134 .quota_read = ext4_quota_read,
1135 .quota_write = ext4_quota_write,
1136#endif
1137 .bdev_try_to_free_page = bdev_try_to_free_page,
1138};
1139
39655164 1140static const struct export_operations ext4_export_ops = {
1b961ac0
CH		 1141 .fh_to_dentry = ext4_fh_to_dentry,
1142 .fh_to_parent = ext4_fh_to_parent,
617ba13b 1143 .get_parent = ext4_get_parent,
ac27a0ec
DK		 1144};
1145
1146enum {
1147 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
1148 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
72578c33 1149 Opt_nouid32, Opt_debug, Opt_removed,
ac27a0ec 1150 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
72578c33 1151 Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload,
ad4eec61
ES		 1152 Opt_commit, Opt_min_batch_time, Opt_max_batch_time, Opt_journal_dev,
1153 Opt_journal_path, Opt_journal_checksum, Opt_journal_async_commit,
ac27a0ec 1154 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
296c355c 1155 Opt_data_err_abort, Opt_data_err_ignore,
ac27a0ec 1156 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
5a20bdfc 1157 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
ee4a3fcd 1158 Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err,
661aa520 1159 Opt_usrquota, Opt_grpquota, Opt_i_version,
1449032b
TT		 1160 Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_mblk_io_submit,
1161 Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity,
5328e635 1162 Opt_inode_readahead_blks, Opt_journal_ioprio,
744692dc 1163 Opt_dioread_nolock, Opt_dioread_lock,
fc6cb1cd 1164 Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable,
df981d03 1165 Opt_max_dir_size_kb,
ac27a0ec
DK		 1166};
1167
a447c093 1168static const match_table_t tokens = {
ac27a0ec
DK		 1169 {Opt_bsd_df, "bsddf"},
1170 {Opt_minix_df, "minixdf"},
1171 {Opt_grpid, "grpid"},
1172 {Opt_grpid, "bsdgroups"},
1173 {Opt_nogrpid, "nogrpid"},
1174 {Opt_nogrpid, "sysvgroups"},
1175 {Opt_resgid, "resgid=%u"},
1176 {Opt_resuid, "resuid=%u"},
1177 {Opt_sb, "sb=%u"},
1178 {Opt_err_cont, "errors=continue"},
1179 {Opt_err_panic, "errors=panic"},
1180 {Opt_err_ro, "errors=remount-ro"},
1181 {Opt_nouid32, "nouid32"},
ac27a0ec 1182 {Opt_debug, "debug"},
72578c33
TT		 1183 {Opt_removed, "oldalloc"},
1184 {Opt_removed, "orlov"},
ac27a0ec
DK		 1185 {Opt_user_xattr, "user_xattr"},
1186 {Opt_nouser_xattr, "nouser_xattr"},
1187 {Opt_acl, "acl"},
1188 {Opt_noacl, "noacl"},
e3bb52ae 1189 {Opt_noload, "norecovery"},
5a916be1 1190 {Opt_noload, "noload"},
72578c33
TT		 1191 {Opt_removed, "nobh"},
1192 {Opt_removed, "bh"},
ac27a0ec 1193 {Opt_commit, "commit=%u"},
30773840
TT		 1194 {Opt_min_batch_time, "min_batch_time=%u"},
1195 {Opt_max_batch_time, "max_batch_time=%u"},
ac27a0ec 1196 {Opt_journal_dev, "journal_dev=%u"},
ad4eec61 1197 {Opt_journal_path, "journal_path=%s"},
818d276c
GS		 1198 {Opt_journal_checksum, "journal_checksum"},
1199 {Opt_journal_async_commit, "journal_async_commit"},
ac27a0ec
DK		 1200 {Opt_abort, "abort"},
1201 {Opt_data_journal, "data=journal"},
1202 {Opt_data_ordered, "data=ordered"},
1203 {Opt_data_writeback, "data=writeback"},
5bf5683a
HK		 1204 {Opt_data_err_abort, "data_err=abort"},
1205 {Opt_data_err_ignore, "data_err=ignore"},
ac27a0ec
DK		 1206 {Opt_offusrjquota, "usrjquota="},
1207 {Opt_usrjquota, "usrjquota=%s"},
1208 {Opt_offgrpjquota, "grpjquota="},
1209 {Opt_grpjquota, "grpjquota=%s"},
1210 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
1211 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
5a20bdfc 1212 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
ac27a0ec
DK		 1213 {Opt_grpquota, "grpquota"},
1214 {Opt_noquota, "noquota"},
1215 {Opt_quota, "quota"},
1216 {Opt_usrquota, "usrquota"},
1217 {Opt_barrier, "barrier=%u"},
06705bff
TT		 1218 {Opt_barrier, "barrier"},
1219 {Opt_nobarrier, "nobarrier"},
25ec56b5 1220 {Opt_i_version, "i_version"},
c9de560d 1221 {Opt_stripe, "stripe=%u"},
64769240 1222 {Opt_delalloc, "delalloc"},
dd919b98 1223 {Opt_nodelalloc, "nodelalloc"},
36ade451
JK		 1224 {Opt_removed, "mblk_io_submit"},
1225 {Opt_removed, "nomblk_io_submit"},
6fd058f7
TT		 1226 {Opt_block_validity, "block_validity"},
1227 {Opt_noblock_validity, "noblock_validity"},
240799cd 1228 {Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
b3881f74 1229 {Opt_journal_ioprio, "journal_ioprio=%u"},
afd4672d 1230 {Opt_auto_da_alloc, "auto_da_alloc=%u"},
06705bff
TT		 1231 {Opt_auto_da_alloc, "auto_da_alloc"},
1232 {Opt_noauto_da_alloc, "noauto_da_alloc"},
744692dc
JZ		 1233 {Opt_dioread_nolock, "dioread_nolock"},
1234 {Opt_dioread_lock, "dioread_lock"},
5328e635
ES		 1235 {Opt_discard, "discard"},
1236 {Opt_nodiscard, "nodiscard"},
fc6cb1cd
TT		 1237 {Opt_init_itable, "init_itable=%u"},
1238 {Opt_init_itable, "init_itable"},
1239 {Opt_noinit_itable, "noinit_itable"},
df981d03 1240 {Opt_max_dir_size_kb, "max_dir_size_kb=%u"},
c7198b9c
TT		 1241 {Opt_removed, "check=none"}, /* mount option from ext2/3 */
1242 {Opt_removed, "nocheck"}, /* mount option from ext2/3 */
1243 {Opt_removed, "reservation"}, /* mount option from ext2/3 */
1244 {Opt_removed, "noreservation"}, /* mount option from ext2/3 */
1245 {Opt_removed, "journal=%u"}, /* mount option from ext2/3 */
f3f12faa 1246 {Opt_err, NULL},
ac27a0ec
DK		 1247};
1248
617ba13b 1249static ext4_fsblk_t get_sb_block(void **data)
ac27a0ec 1250{
617ba13b 1251 ext4_fsblk_t sb_block;
ac27a0ec
DK		 1252 char *options = (char *) *data;
1253
1254 if (!options || strncmp(options, "sb=", 3) != 0)
1255 return 1; /* Default location */
0b8e58a1 1256
ac27a0ec 1257 options += 3;
0b8e58a1 1258 /* TODO: use simple_strtoll with >32bit ext4 */
ac27a0ec
DK		 1259 sb_block = simple_strtoul(options, &options, 0);
1260 if (*options && *options != ',') {
4776004f 1261 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
ac27a0ec
DK		 1262 (char *) *data);
1263 return 1;
1264 }
1265 if (*options == ',')
1266 options++;
1267 *data = (void *) options;
0b8e58a1 1268
ac27a0ec
DK		 1269 return sb_block;
1270}
1271
b3881f74 1272#define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
437ca0fd
DM		 1273static char deprecated_msg[] = "Mount option \"%s\" will be removed by %s\n"
1274 "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
b3881f74 1275
56c50f11
DM		 1276#ifdef CONFIG_QUOTA
1277static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
1278{
1279 struct ext4_sb_info *sbi = EXT4_SB(sb);
1280 char *qname;
03dafb5f 1281 int ret = -1;
56c50f11
DM		 1282
1283 if (sb_any_quota_loaded(sb) &&
1284 !sbi->s_qf_names[qtype]) {
1285 ext4_msg(sb, KERN_ERR,
1286 "Cannot change journaled "
1287 "quota options when quota turned on");
57f73c2c 1288 return -1;
56c50f11 1289 }
262b4662
JK		 1290 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA)) {
1291 ext4_msg(sb, KERN_ERR, "Cannot set journaled quota options "
1292 "when QUOTA feature is enabled");
1293 return -1;
1294 }
56c50f11
DM		 1295 qname = match_strdup(args);
1296 if (!qname) {
1297 ext4_msg(sb, KERN_ERR,
1298 "Not enough memory for storing quotafile name");
57f73c2c 1299 return -1;
56c50f11 1300 }
03dafb5f
CG		 1301 if (sbi->s_qf_names[qtype]) {
1302 if (strcmp(sbi->s_qf_names[qtype], qname) == 0)
1303 ret = 1;
1304 else
1305 ext4_msg(sb, KERN_ERR,
1306 "%s quota file already specified",
1307 QTYPE2NAME(qtype));
1308 goto errout;
56c50f11 1309 }
03dafb5f 1310 if (strchr(qname, '/')) {
56c50f11
DM		 1311 ext4_msg(sb, KERN_ERR,
1312 "quotafile must be on filesystem root");
03dafb5f 1313 goto errout;
56c50f11 1314 }
03dafb5f 1315 sbi->s_qf_names[qtype] = qname;
fd8c37ec 1316 set_opt(sb, QUOTA);
56c50f11 1317 return 1;
03dafb5f
CG		 1318errout:
1319 kfree(qname);
1320 return ret;
56c50f11
DM		 1321}
1322
1323static int clear_qf_name(struct super_block *sb, int qtype)
1324{
1325
1326 struct ext4_sb_info *sbi = EXT4_SB(sb);
1327
1328 if (sb_any_quota_loaded(sb) &&
1329 sbi->s_qf_names[qtype]) {
1330 ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options"
1331 " when quota turned on");
57f73c2c 1332 return -1;
56c50f11 1333 }
03dafb5f 1334 kfree(sbi->s_qf_names[qtype]);
56c50f11
DM		 1335 sbi->s_qf_names[qtype] = NULL;
1336 return 1;
1337}
1338#endif
1339
26092bf5
TT		 1340#define MOPT_SET 0x0001
1341#define MOPT_CLEAR 0x0002
1342#define MOPT_NOSUPPORT 0x0004
1343#define MOPT_EXPLICIT 0x0008
1344#define MOPT_CLEAR_ERR 0x0010
1345#define MOPT_GTE0 0x0020
ac27a0ec 1346#ifdef CONFIG_QUOTA
26092bf5
TT		 1347#define MOPT_Q 0
1348#define MOPT_QFMT 0x0040
1349#else
1350#define MOPT_Q MOPT_NOSUPPORT
1351#define MOPT_QFMT MOPT_NOSUPPORT
ac27a0ec 1352#endif
26092bf5 1353#define MOPT_DATAJ 0x0080
8dc0aa8c
TT		 1354#define MOPT_NO_EXT2 0x0100
1355#define MOPT_NO_EXT3 0x0200
1356#define MOPT_EXT4_ONLY (MOPT_NO_EXT2 | MOPT_NO_EXT3)
ad4eec61 1357#define MOPT_STRING 0x0400
26092bf5
TT		 1358
1359static const struct mount_opts {
1360 int token;
1361 int mount_opt;
1362 int flags;
1363} ext4_mount_opts[] = {
1364 {Opt_minix_df, EXT4_MOUNT_MINIX_DF, MOPT_SET},
1365 {Opt_bsd_df, EXT4_MOUNT_MINIX_DF, MOPT_CLEAR},
1366 {Opt_grpid, EXT4_MOUNT_GRPID, MOPT_SET},
1367 {Opt_nogrpid, EXT4_MOUNT_GRPID, MOPT_CLEAR},
26092bf5
TT		 1368 {Opt_block_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_SET},
1369 {Opt_noblock_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_CLEAR},
8dc0aa8c
TT		 1370 {Opt_dioread_nolock, EXT4_MOUNT_DIOREAD_NOLOCK,
1371 MOPT_EXT4_ONLY | MOPT_SET},
1372 {Opt_dioread_lock, EXT4_MOUNT_DIOREAD_NOLOCK,
1373 MOPT_EXT4_ONLY | MOPT_CLEAR},
26092bf5
TT		 1374 {Opt_discard, EXT4_MOUNT_DISCARD, MOPT_SET},
1375 {Opt_nodiscard, EXT4_MOUNT_DISCARD, MOPT_CLEAR},
8dc0aa8c
TT		 1376 {Opt_delalloc, EXT4_MOUNT_DELALLOC,
1377 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
1378 {Opt_nodelalloc, EXT4_MOUNT_DELALLOC,
59d9fa5c 1379 MOPT_EXT4_ONLY | MOPT_CLEAR},
8dc0aa8c
TT		 1380 {Opt_journal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
1381 MOPT_EXT4_ONLY | MOPT_SET},
26092bf5 1382 {Opt_journal_async_commit, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT |
8dc0aa8c
TT		 1383 EXT4_MOUNT_JOURNAL_CHECKSUM),
1384 MOPT_EXT4_ONLY | MOPT_SET},
1385 {Opt_noload, EXT4_MOUNT_NOLOAD, MOPT_NO_EXT2 | MOPT_SET},
26092bf5
TT		 1386 {Opt_err_panic, EXT4_MOUNT_ERRORS_PANIC, MOPT_SET | MOPT_CLEAR_ERR},
1387 {Opt_err_ro, EXT4_MOUNT_ERRORS_RO, MOPT_SET | MOPT_CLEAR_ERR},
1388 {Opt_err_cont, EXT4_MOUNT_ERRORS_CONT, MOPT_SET | MOPT_CLEAR_ERR},
8dc0aa8c
TT		 1389 {Opt_data_err_abort, EXT4_MOUNT_DATA_ERR_ABORT,
1390 MOPT_NO_EXT2 | MOPT_SET},
1391 {Opt_data_err_ignore, EXT4_MOUNT_DATA_ERR_ABORT,
1392 MOPT_NO_EXT2 | MOPT_CLEAR},
26092bf5
TT		 1393 {Opt_barrier, EXT4_MOUNT_BARRIER, MOPT_SET},
1394 {Opt_nobarrier, EXT4_MOUNT_BARRIER, MOPT_CLEAR},
1395 {Opt_noauto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_SET},
1396 {Opt_auto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_CLEAR},
1397 {Opt_noinit_itable, EXT4_MOUNT_INIT_INODE_TABLE, MOPT_CLEAR},
1398 {Opt_commit, 0, MOPT_GTE0},
1399 {Opt_max_batch_time, 0, MOPT_GTE0},
1400 {Opt_min_batch_time, 0, MOPT_GTE0},
1401 {Opt_inode_readahead_blks, 0, MOPT_GTE0},
1402 {Opt_init_itable, 0, MOPT_GTE0},
1403 {Opt_stripe, 0, MOPT_GTE0},
0efb3b23
JK		 1404 {Opt_resuid, 0, MOPT_GTE0},
1405 {Opt_resgid, 0, MOPT_GTE0},
1406 {Opt_journal_dev, 0, MOPT_GTE0},
ad4eec61 1407 {Opt_journal_path, 0, MOPT_STRING},
0efb3b23 1408 {Opt_journal_ioprio, 0, MOPT_GTE0},
8dc0aa8c
TT		 1409 {Opt_data_journal, EXT4_MOUNT_JOURNAL_DATA, MOPT_NO_EXT2 | MOPT_DATAJ},
1410 {Opt_data_ordered, EXT4_MOUNT_ORDERED_DATA, MOPT_NO_EXT2 | MOPT_DATAJ},
1411 {Opt_data_writeback, EXT4_MOUNT_WRITEBACK_DATA,
1412 MOPT_NO_EXT2 | MOPT_DATAJ},
26092bf5
TT		 1413 {Opt_user_xattr, EXT4_MOUNT_XATTR_USER, MOPT_SET},
1414 {Opt_nouser_xattr, EXT4_MOUNT_XATTR_USER, MOPT_CLEAR},
03010a33 1415#ifdef CONFIG_EXT4_FS_POSIX_ACL
26092bf5
TT		 1416 {Opt_acl, EXT4_MOUNT_POSIX_ACL, MOPT_SET},
1417 {Opt_noacl, EXT4_MOUNT_POSIX_ACL, MOPT_CLEAR},
ac27a0ec 1418#else
26092bf5
TT		 1419 {Opt_acl, 0, MOPT_NOSUPPORT},
1420 {Opt_noacl, 0, MOPT_NOSUPPORT},
ac27a0ec 1421#endif
26092bf5
TT		 1422 {Opt_nouid32, EXT4_MOUNT_NO_UID32, MOPT_SET},
1423 {Opt_debug, EXT4_MOUNT_DEBUG, MOPT_SET},
1424 {Opt_quota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA, MOPT_SET | MOPT_Q},
1425 {Opt_usrquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA,
1426 MOPT_SET | MOPT_Q},
1427 {Opt_grpquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_GRPQUOTA,
1428 MOPT_SET | MOPT_Q},
1429 {Opt_noquota, (EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA |
1430 EXT4_MOUNT_GRPQUOTA), MOPT_CLEAR | MOPT_Q},
1431 {Opt_usrjquota, 0, MOPT_Q},
1432 {Opt_grpjquota, 0, MOPT_Q},
1433 {Opt_offusrjquota, 0, MOPT_Q},
1434 {Opt_offgrpjquota, 0, MOPT_Q},
1435 {Opt_jqfmt_vfsold, QFMT_VFS_OLD, MOPT_QFMT},
1436 {Opt_jqfmt_vfsv0, QFMT_VFS_V0, MOPT_QFMT},
1437 {Opt_jqfmt_vfsv1, QFMT_VFS_V1, MOPT_QFMT},
df981d03 1438 {Opt_max_dir_size_kb, 0, MOPT_GTE0},
26092bf5
TT		 1439 {Opt_err, 0, 0}
1440};
1441
1442static int handle_mount_opt(struct super_block *sb, char *opt, int token,
1443 substring_t *args, unsigned long *journal_devnum,
1444 unsigned int *journal_ioprio, int is_remount)
1445{
1446 struct ext4_sb_info *sbi = EXT4_SB(sb);
1447 const struct mount_opts *m;
08cefc7a
EB		 1448 kuid_t uid;
1449 kgid_t gid;
26092bf5
TT		 1450 int arg = 0;
1451
57f73c2c
TT		 1452#ifdef CONFIG_QUOTA
1453 if (token == Opt_usrjquota)
1454 return set_qf_name(sb, USRQUOTA, &args[0]);
1455 else if (token == Opt_grpjquota)
1456 return set_qf_name(sb, GRPQUOTA, &args[0]);
1457 else if (token == Opt_offusrjquota)
1458 return clear_qf_name(sb, USRQUOTA);
1459 else if (token == Opt_offgrpjquota)
1460 return clear_qf_name(sb, GRPQUOTA);
1461#endif
26092bf5 1462 switch (token) {
f7048605
TT		 1463 case Opt_noacl:
1464 case Opt_nouser_xattr:
1465 ext4_msg(sb, KERN_WARNING, deprecated_msg, opt, "3.5");
1466 break;
26092bf5
TT		 1467 case Opt_sb:
1468 return 1; /* handled by get_sb_block() */
1469 case Opt_removed:
5f3633e3 1470 ext4_msg(sb, KERN_WARNING, "Ignoring removed %s option", opt);
26092bf5 1471 return 1;
26092bf5
TT		 1472 case Opt_abort:
1473 sbi->s_mount_flags |= EXT4_MF_FS_ABORTED;
1474 return 1;
1475 case Opt_i_version:
1476 sb->s_flags |= MS_I_VERSION;
1477 return 1;
26092bf5
TT		 1478 }
1479
5f3633e3
JK		 1480 for (m = ext4_mount_opts; m->token != Opt_err; m++)
1481 if (token == m->token)
1482 break;
1483
1484 if (m->token == Opt_err) {
1485 ext4_msg(sb, KERN_ERR, "Unrecognized mount option \"%s\" "
1486 "or missing value", opt);
1487 return -1;
1488 }
1489
8dc0aa8c
TT		 1490 if ((m->flags & MOPT_NO_EXT2) && IS_EXT2_SB(sb)) {
1491 ext4_msg(sb, KERN_ERR,
1492 "Mount option \"%s\" incompatible with ext2", opt);
1493 return -1;
1494 }
1495 if ((m->flags & MOPT_NO_EXT3) && IS_EXT3_SB(sb)) {
1496 ext4_msg(sb, KERN_ERR,
1497 "Mount option \"%s\" incompatible with ext3", opt);
1498 return -1;
1499 }
1500
ad4eec61 1501 if (args->from && !(m->flags & MOPT_STRING) && match_int(args, &arg))
5f3633e3
JK		 1502 return -1;
1503 if (args->from && (m->flags & MOPT_GTE0) && (arg < 0))
1504 return -1;
1505 if (m->flags & MOPT_EXPLICIT)
1506 set_opt2(sb, EXPLICIT_DELALLOC);
1507 if (m->flags & MOPT_CLEAR_ERR)
1508 clear_opt(sb, ERRORS_MASK);
1509 if (token == Opt_noquota && sb_any_quota_loaded(sb)) {
1510 ext4_msg(sb, KERN_ERR, "Cannot change quota "
1511 "options when quota turned on");
1512 return -1;
1513 }
1514
1515 if (m->flags & MOPT_NOSUPPORT) {
1516 ext4_msg(sb, KERN_ERR, "%s option not supported", opt);
1517 } else if (token == Opt_commit) {
1518 if (arg == 0)
1519 arg = JBD2_DEFAULT_MAX_COMMIT_AGE;
1520 sbi->s_commit_interval = HZ * arg;
1521 } else if (token == Opt_max_batch_time) {
1522 if (arg == 0)
1523 arg = EXT4_DEF_MAX_BATCH_TIME;
1524 sbi->s_max_batch_time = arg;
1525 } else if (token == Opt_min_batch_time) {
1526 sbi->s_min_batch_time = arg;
1527 } else if (token == Opt_inode_readahead_blks) {
e33e60ea
JK		 1528 if (arg && (arg > (1 << 30) || !is_power_of_2(arg))) {
1529 ext4_msg(sb, KERN_ERR,
1530 "EXT4-fs: inode_readahead_blks must be "
1531 "0 or a power of 2 smaller than 2^31");
26092bf5 1532 return -1;
5f3633e3
JK		 1533 }
1534 sbi->s_inode_readahead_blks = arg;
1535 } else if (token == Opt_init_itable) {
1536 set_opt(sb, INIT_INODE_TABLE);
1537 if (!args->from)
1538 arg = EXT4_DEF_LI_WAIT_MULT;
1539 sbi->s_li_wait_mult = arg;
1540 } else if (token == Opt_max_dir_size_kb) {
1541 sbi->s_max_dir_size_kb = arg;
1542 } else if (token == Opt_stripe) {
1543 sbi->s_stripe = arg;
1544 } else if (token == Opt_resuid) {
1545 uid = make_kuid(current_user_ns(), arg);
1546 if (!uid_valid(uid)) {
1547 ext4_msg(sb, KERN_ERR, "Invalid uid value %d", arg);
26092bf5
TT		 1548 return -1;
1549 }
5f3633e3
JK		 1550 sbi->s_resuid = uid;
1551 } else if (token == Opt_resgid) {
1552 gid = make_kgid(current_user_ns(), arg);
1553 if (!gid_valid(gid)) {
1554 ext4_msg(sb, KERN_ERR, "Invalid gid value %d", arg);
1555 return -1;
1556 }
1557 sbi->s_resgid = gid;
1558 } else if (token == Opt_journal_dev) {
1559 if (is_remount) {
1560 ext4_msg(sb, KERN_ERR,
1561 "Cannot specify journal on remount");
1562 return -1;
1563 }
1564 *journal_devnum = arg;
ad4eec61
ES		 1565 } else if (token == Opt_journal_path) {
1566 char *journal_path;
1567 struct inode *journal_inode;
1568 struct path path;
1569 int error;
1570
1571 if (is_remount) {
1572 ext4_msg(sb, KERN_ERR,
1573 "Cannot specify journal on remount");
1574 return -1;
1575 }
1576 journal_path = match_strdup(&args[0]);
1577 if (!journal_path) {
1578 ext4_msg(sb, KERN_ERR, "error: could not dup "
1579 "journal device string");
1580 return -1;
1581 }
1582
1583 error = kern_path(journal_path, LOOKUP_FOLLOW, &path);
1584 if (error) {
1585 ext4_msg(sb, KERN_ERR, "error: could not find "
1586 "journal device path: error %d", error);
1587 kfree(journal_path);
1588 return -1;
1589 }
1590
1591 journal_inode = path.dentry->d_inode;
1592 if (!S_ISBLK(journal_inode->i_mode)) {
1593 ext4_msg(sb, KERN_ERR, "error: journal path %s "
1594 "is not a block device", journal_path);
1595 path_put(&path);
1596 kfree(journal_path);
1597 return -1;
1598 }
1599
1600 *journal_devnum = new_encode_dev(journal_inode->i_rdev);
1601 path_put(&path);
1602 kfree(journal_path);
5f3633e3
JK		 1603 } else if (token == Opt_journal_ioprio) {
1604 if (arg > 7) {
1605 ext4_msg(sb, KERN_ERR, "Invalid journal IO priority"
1606 " (must be 0-7)");
1607 return -1;
1608 }
1609 *journal_ioprio =
1610 IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, arg);
1611 } else if (m->flags & MOPT_DATAJ) {
1612 if (is_remount) {
1613 if (!sbi->s_journal)
1614 ext4_msg(sb, KERN_WARNING, "Remounting file system with no journal so ignoring journalled data option");
1615 else if (test_opt(sb, DATA_FLAGS) != m->mount_opt) {
0efb3b23 1616 ext4_msg(sb, KERN_ERR,
26092bf5 1617 "Cannot change data mode on remount");
26092bf5 1618 return -1;
ac27a0ec 1619 }
26092bf5 1620 } else {
5f3633e3
JK		 1621 clear_opt(sb, DATA_FLAGS);
1622 sbi->s_mount_opt |= m->mount_opt;
ac27a0ec 1623 }
5f3633e3
JK		 1624#ifdef CONFIG_QUOTA
1625 } else if (m->flags & MOPT_QFMT) {
1626 if (sb_any_quota_loaded(sb) &&
1627 sbi->s_jquota_fmt != m->mount_opt) {
1628 ext4_msg(sb, KERN_ERR, "Cannot change journaled "
1629 "quota options when quota turned on");
1630 return -1;
1631 }
262b4662
JK		 1632 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
1633 EXT4_FEATURE_RO_COMPAT_QUOTA)) {
1634 ext4_msg(sb, KERN_ERR,
1635 "Cannot set journaled quota options "
1636 "when QUOTA feature is enabled");
1637 return -1;
1638 }
5f3633e3
JK		 1639 sbi->s_jquota_fmt = m->mount_opt;
1640#endif
1641 } else {
1642 if (!args->from)
1643 arg = 1;
1644 if (m->flags & MOPT_CLEAR)
1645 arg = !arg;
1646 else if (unlikely(!(m->flags & MOPT_SET))) {
1647 ext4_msg(sb, KERN_WARNING,
1648 "buggy handling of option %s", opt);
1649 WARN_ON(1);
1650 return -1;
1651 }
1652 if (arg != 0)
1653 sbi->s_mount_opt |= m->mount_opt;
1654 else
1655 sbi->s_mount_opt &= ~m->mount_opt;
26092bf5 1656 }
5f3633e3 1657 return 1;
26092bf5
TT		 1658}
1659
1660static int parse_options(char *options, struct super_block *sb,
1661 unsigned long *journal_devnum,
1662 unsigned int *journal_ioprio,
1663 int is_remount)
1664{
1665 struct ext4_sb_info *sbi = EXT4_SB(sb);
1666 char *p;
1667 substring_t args[MAX_OPT_ARGS];
1668 int token;
1669
1670 if (!options)
1671 return 1;
1672
1673 while ((p = strsep(&options, ",")) != NULL) {
1674 if (!*p)
1675 continue;
1676 /*
1677 * Initialize args struct so we know whether arg was
1678 * found; some options take optional arguments.
1679 */
caecd0af 1680 args[0].to = args[0].from = NULL;
26092bf5
TT		 1681 token = match_token(p, tokens, args);
1682 if (handle_mount_opt(sb, p, token, args, journal_devnum,
1683 journal_ioprio, is_remount) < 0)
1684 return 0;
ac27a0ec
DK		 1685 }
1686#ifdef CONFIG_QUOTA
262b4662
JK		 1687 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) &&
1688 (test_opt(sb, USRQUOTA) || test_opt(sb, GRPQUOTA))) {
1689 ext4_msg(sb, KERN_ERR, "Cannot set quota options when QUOTA "
1690 "feature is enabled");
1691 return 0;
1692 }
ac27a0ec 1693 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
482a7425 1694 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
fd8c37ec 1695 clear_opt(sb, USRQUOTA);
ac27a0ec 1696
482a7425 1697 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
fd8c37ec 1698 clear_opt(sb, GRPQUOTA);
ac27a0ec 1699
56c50f11 1700 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
b31e1552
ES		 1701 ext4_msg(sb, KERN_ERR, "old and new quota "
1702 "format mixing");
ac27a0ec
DK		 1703 return 0;
1704 }
1705
1706 if (!sbi->s_jquota_fmt) {
b31e1552
ES		 1707 ext4_msg(sb, KERN_ERR, "journaled quota format "
1708 "not specified");
ac27a0ec
DK		 1709 return 0;
1710 }
1711 } else {
1712 if (sbi->s_jquota_fmt) {
b31e1552 1713 ext4_msg(sb, KERN_ERR, "journaled quota format "
2c8be6b2 1714 "specified with no journaling "
b31e1552 1715 "enabled");
ac27a0ec
DK		 1716 return 0;
1717 }
1718 }
1719#endif
261cb20c
JK		 1720 if (test_opt(sb, DIOREAD_NOLOCK)) {
1721 int blocksize =
1722 BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);
1723
1724 if (blocksize < PAGE_CACHE_SIZE) {
1725 ext4_msg(sb, KERN_ERR, "can't mount with "
1726 "dioread_nolock if block size != PAGE_SIZE");
1727 return 0;
1728 }
1729 }
ac27a0ec
DK		 1730 return 1;
1731}
1732
2adf6da8
TT		 1733static inline void ext4_show_quota_options(struct seq_file *seq,
1734 struct super_block *sb)
1735{
1736#if defined(CONFIG_QUOTA)
1737 struct ext4_sb_info *sbi = EXT4_SB(sb);
1738
1739 if (sbi->s_jquota_fmt) {
1740 char *fmtname = "";
1741
1742 switch (sbi->s_jquota_fmt) {
1743 case QFMT_VFS_OLD:
1744 fmtname = "vfsold";
1745 break;
1746 case QFMT_VFS_V0:
1747 fmtname = "vfsv0";
1748 break;
1749 case QFMT_VFS_V1:
1750 fmtname = "vfsv1";
1751 break;
1752 }
1753 seq_printf(seq, ",jqfmt=%s", fmtname);
1754 }
1755
1756 if (sbi->s_qf_names[USRQUOTA])
1757 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
1758
1759 if (sbi->s_qf_names[GRPQUOTA])
1760 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
2adf6da8
TT		 1761#endif
1762}
1763
5a916be1
TT		 1764static const char *token2str(int token)
1765{
50df9fd5 1766 const struct match_token *t;
5a916be1
TT		 1767
1768 for (t = tokens; t->token != Opt_err; t++)
1769 if (t->token == token && !strchr(t->pattern, '='))
1770 break;
1771 return t->pattern;
1772}
1773
2adf6da8
TT		 1774/*
1775 * Show an option if
1776 * - it's set to a non-default value OR
1777 * - if the per-sb default is different from the global default
1778 */
66acdcf4
TT		 1779static int _ext4_show_options(struct seq_file *seq, struct super_block *sb,
1780 int nodefs)
2adf6da8 1781{
2adf6da8
TT		 1782 struct ext4_sb_info *sbi = EXT4_SB(sb);
1783 struct ext4_super_block *es = sbi->s_es;
66acdcf4 1784 int def_errors, def_mount_opt = nodefs ? 0 : sbi->s_def_mount_opt;
5a916be1 1785 const struct mount_opts *m;
66acdcf4 1786 char sep = nodefs ? '\n' : ',';
2adf6da8 1787
66acdcf4
TT		 1788#define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep)
1789#define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg)
2adf6da8
TT		 1790
1791 if (sbi->s_sb_block != 1)
5a916be1
TT		 1792 SEQ_OPTS_PRINT("sb=%llu", sbi->s_sb_block);
1793
1794 for (m = ext4_mount_opts; m->token != Opt_err; m++) {
1795 int want_set = m->flags & MOPT_SET;
1796 if (((m->flags & (MOPT_SET|MOPT_CLEAR)) == 0) ||
1797 (m->flags & MOPT_CLEAR_ERR))
1798 continue;
66acdcf4 1799 if (!(m->mount_opt & (sbi->s_mount_opt ^ def_mount_opt)))
5a916be1
TT		 1800 continue; /* skip if same as the default */
1801 if ((want_set &&
1802 (sbi->s_mount_opt & m->mount_opt) != m->mount_opt) ||
1803 (!want_set && (sbi->s_mount_opt & m->mount_opt)))
1804 continue; /* select Opt_noFoo vs Opt_Foo */
1805 SEQ_OPTS_PRINT("%s", token2str(m->token));
2adf6da8 1806 }
5a916be1 1807
08cefc7a 1808 if (nodefs || !uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT4_DEF_RESUID)) ||
5a916be1 1809 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID)
08cefc7a
EB		 1810 SEQ_OPTS_PRINT("resuid=%u",
1811 from_kuid_munged(&init_user_ns, sbi->s_resuid));
1812 if (nodefs || !gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT4_DEF_RESGID)) ||
5a916be1 1813 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID)
08cefc7a
EB		 1814 SEQ_OPTS_PRINT("resgid=%u",
1815 from_kgid_munged(&init_user_ns, sbi->s_resgid));
66acdcf4 1816 def_errors = nodefs ? -1 : le16_to_cpu(es->s_errors);
5a916be1
TT		 1817 if (test_opt(sb, ERRORS_RO) && def_errors != EXT4_ERRORS_RO)
1818 SEQ_OPTS_PUTS("errors=remount-ro");
2adf6da8 1819 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
5a916be1 1820 SEQ_OPTS_PUTS("errors=continue");
2adf6da8 1821 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
5a916be1 1822 SEQ_OPTS_PUTS("errors=panic");
66acdcf4 1823 if (nodefs || sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ)
5a916be1 1824 SEQ_OPTS_PRINT("commit=%lu", sbi->s_commit_interval / HZ);
66acdcf4 1825 if (nodefs || sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME)
5a916be1 1826 SEQ_OPTS_PRINT("min_batch_time=%u", sbi->s_min_batch_time);
66acdcf4 1827 if (nodefs || sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME)
5a916be1 1828 SEQ_OPTS_PRINT("max_batch_time=%u", sbi->s_max_batch_time);
2adf6da8 1829 if (sb->s_flags & MS_I_VERSION)
5a916be1 1830 SEQ_OPTS_PUTS("i_version");
66acdcf4 1831 if (nodefs || sbi->s_stripe)
5a916be1 1832 SEQ_OPTS_PRINT("stripe=%lu", sbi->s_stripe);
66acdcf4 1833 if (EXT4_MOUNT_DATA_FLAGS & (sbi->s_mount_opt ^ def_mount_opt)) {
5a916be1
TT		 1834 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
1835 SEQ_OPTS_PUTS("data=journal");
1836 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
1837 SEQ_OPTS_PUTS("data=ordered");
1838 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
1839 SEQ_OPTS_PUTS("data=writeback");
1840 }
66acdcf4
TT		 1841 if (nodefs ||
1842 sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
5a916be1
TT		 1843 SEQ_OPTS_PRINT("inode_readahead_blks=%u",
1844 sbi->s_inode_readahead_blks);
2adf6da8 1845
66acdcf4
TT		 1846 if (nodefs || (test_opt(sb, INIT_INODE_TABLE) &&
1847 (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT)))
5a916be1 1848 SEQ_OPTS_PRINT("init_itable=%u", sbi->s_li_wait_mult);
df981d03
TT		 1849 if (nodefs || sbi->s_max_dir_size_kb)
1850 SEQ_OPTS_PRINT("max_dir_size_kb=%u", sbi->s_max_dir_size_kb);
2adf6da8
TT		 1851
1852 ext4_show_quota_options(seq, sb);
2adf6da8
TT		 1853 return 0;
1854}
1855
66acdcf4
TT		 1856static int ext4_show_options(struct seq_file *seq, struct dentry *root)
1857{
1858 return _ext4_show_options(seq, root->d_sb, 0);
1859}
1860
1861static int options_seq_show(struct seq_file *seq, void *offset)
1862{
1863 struct super_block *sb = seq->private;
1864 int rc;
1865
1866 seq_puts(seq, (sb->s_flags & MS_RDONLY) ? "ro" : "rw");
1867 rc = _ext4_show_options(seq, sb, 1);
1868 seq_puts(seq, "\n");
1869 return rc;
1870}
1871
1872static int options_open_fs(struct inode *inode, struct file *file)
1873{
d9dda78b 1874 return single_open(file, options_seq_show, PDE_DATA(inode));
66acdcf4
TT		 1875}
1876
1877static const struct file_operations ext4_seq_options_fops = {
1878 .owner = THIS_MODULE,
1879 .open = options_open_fs,
1880 .read = seq_read,
1881 .llseek = seq_lseek,
1882 .release = single_release,
1883};
1884
617ba13b 1885static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
ac27a0ec
DK		 1886 int read_only)
1887{
617ba13b 1888 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec
DK		 1889 int res = 0;
1890
617ba13b 1891 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
b31e1552
ES		 1892 ext4_msg(sb, KERN_ERR, "revision level too high, "
1893 "forcing read-only mode");
ac27a0ec
DK		 1894 res = MS_RDONLY;
1895 }
1896 if (read_only)
281b5995 1897 goto done;
617ba13b 1898 if (!(sbi->s_mount_state & EXT4_VALID_FS))
b31e1552
ES		 1899 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
1900 "running e2fsck is recommended");
617ba13b 1901 else if ((sbi->s_mount_state & EXT4_ERROR_FS))
b31e1552
ES		 1902 ext4_msg(sb, KERN_WARNING,
1903 "warning: mounting fs with errors, "
1904 "running e2fsck is recommended");
ed3ce80a 1905 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
ac27a0ec
DK		 1906 le16_to_cpu(es->s_mnt_count) >=
1907 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
b31e1552
ES		 1908 ext4_msg(sb, KERN_WARNING,
1909 "warning: maximal mount count reached, "
1910 "running e2fsck is recommended");
ac27a0ec
DK		 1911 else if (le32_to_cpu(es->s_checkinterval) &&
1912 (le32_to_cpu(es->s_lastcheck) +
1913 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
b31e1552
ES		 1914 ext4_msg(sb, KERN_WARNING,
1915 "warning: checktime reached, "
1916 "running e2fsck is recommended");
0b8e58a1 1917 if (!sbi->s_journal)
0390131b 1918 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
ac27a0ec 1919 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
617ba13b 1920 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
e8546d06 1921 le16_add_cpu(&es->s_mnt_count, 1);
ac27a0ec 1922 es->s_mtime = cpu_to_le32(get_seconds());
617ba13b 1923 ext4_update_dynamic_rev(sb);
0390131b
FM		 1924 if (sbi->s_journal)
1925 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
ac27a0ec 1926
e2d67052 1927 ext4_commit_super(sb, 1);
281b5995 1928done:
ac27a0ec 1929 if (test_opt(sb, DEBUG))
a9df9a49 1930 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
a2595b8a 1931 "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
ac27a0ec
DK		 1932 sb->s_blocksize,
1933 sbi->s_groups_count,
617ba13b
MC		 1934 EXT4_BLOCKS_PER_GROUP(sb),
1935 EXT4_INODES_PER_GROUP(sb),
a2595b8a 1936 sbi->s_mount_opt, sbi->s_mount_opt2);
ac27a0ec 1937
7abc52c2 1938 cleancache_init_fs(sb);
ac27a0ec
DK		 1939 return res;
1940}
1941
117fff10
TT		 1942int ext4_alloc_flex_bg_array(struct super_block *sb, ext4_group_t ngroup)
1943{
1944 struct ext4_sb_info *sbi = EXT4_SB(sb);
1945 struct flex_groups *new_groups;
1946 int size;
1947
1948 if (!sbi->s_log_groups_per_flex)
1949 return 0;
1950
1951 size = ext4_flex_group(sbi, ngroup - 1) + 1;
1952 if (size <= sbi->s_flex_groups_allocated)
1953 return 0;
1954
1955 size = roundup_pow_of_two(size * sizeof(struct flex_groups));
1956 new_groups = ext4_kvzalloc(size, GFP_KERNEL);
1957 if (!new_groups) {
1958 ext4_msg(sb, KERN_ERR, "not enough memory for %d flex groups",
1959 size / (int) sizeof(struct flex_groups));
1960 return -ENOMEM;
1961 }
1962
1963 if (sbi->s_flex_groups) {
1964 memcpy(new_groups, sbi->s_flex_groups,
1965 (sbi->s_flex_groups_allocated *
1966 sizeof(struct flex_groups)));
1967 ext4_kvfree(sbi->s_flex_groups);
1968 }
1969 sbi->s_flex_groups = new_groups;
1970 sbi->s_flex_groups_allocated = size / sizeof(struct flex_groups);
1971 return 0;
1972}
1973
772cb7c8
JS		 1974static int ext4_fill_flex_info(struct super_block *sb)
1975{
1976 struct ext4_sb_info *sbi = EXT4_SB(sb);
1977 struct ext4_group_desc *gdp = NULL;
772cb7c8 1978 ext4_group_t flex_group;
117fff10 1979 int i, err;
772cb7c8 1980
503358ae 1981 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
d50f2ab6 1982 if (sbi->s_log_groups_per_flex < 1 || sbi->s_log_groups_per_flex > 31) {
772cb7c8
JS		 1983 sbi->s_log_groups_per_flex = 0;
1984 return 1;
1985 }
1986
117fff10
TT		 1987 err = ext4_alloc_flex_bg_array(sb, sbi->s_groups_count);
1988 if (err)
9933fc0a 1989 goto failed;
772cb7c8 1990
772cb7c8 1991 for (i = 0; i < sbi->s_groups_count; i++) {
88b6edd1 1992 gdp = ext4_get_group_desc(sb, i, NULL);
772cb7c8
JS		 1993
1994 flex_group = ext4_flex_group(sbi, i);
7ad9bb65
TT		 1995 atomic_add(ext4_free_inodes_count(sb, gdp),
1996 &sbi->s_flex_groups[flex_group].free_inodes);
90ba983f
TT		 1997 atomic64_add(ext4_free_group_clusters(sb, gdp),
1998 &sbi->s_flex_groups[flex_group].free_clusters);
7ad9bb65
TT		 1999 atomic_add(ext4_used_dirs_count(sb, gdp),
2000 &sbi->s_flex_groups[flex_group].used_dirs);
772cb7c8
JS		 2001 }
2002
2003 return 1;
2004failed:
2005 return 0;
2006}
2007
feb0ab32
DW		 2008static __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
2009 struct ext4_group_desc *gdp)
717d50e4 2010{
feb0ab32 2011 int offset;
717d50e4 2012 __u16 crc = 0;
feb0ab32 2013 __le32 le_group = cpu_to_le32(block_group);
717d50e4 2014
feb0ab32
DW		 2015 if ((sbi->s_es->s_feature_ro_compat &
2016 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))) {
2017 /* Use new metadata_csum algorithm */
d6a77105 2018 __le16 save_csum;
feb0ab32
DW		 2019 __u32 csum32;
2020
d6a77105 2021 save_csum = gdp->bg_checksum;
feb0ab32
DW		 2022 gdp->bg_checksum = 0;
2023 csum32 = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&le_group,
2024 sizeof(le_group));
2025 csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp,
2026 sbi->s_desc_size);
d6a77105 2027 gdp->bg_checksum = save_csum;
feb0ab32
DW		 2028
2029 crc = csum32 & 0xFFFF;
2030 goto out;
717d50e4
AD		 2031 }
2032
feb0ab32
DW		 2033 /* old crc16 code */
2034 offset = offsetof(struct ext4_group_desc, bg_checksum);
2035
2036 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
2037 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
2038 crc = crc16(crc, (__u8 *)gdp, offset);
2039 offset += sizeof(gdp->bg_checksum); /* skip checksum */
2040 /* for checksum of struct ext4_group_desc do the rest...*/
2041 if ((sbi->s_es->s_feature_incompat &
2042 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) &&
2043 offset < le16_to_cpu(sbi->s_es->s_desc_size))
2044 crc = crc16(crc, (__u8 *)gdp + offset,
2045 le16_to_cpu(sbi->s_es->s_desc_size) -
2046 offset);
2047
2048out:
717d50e4
AD		 2049 return cpu_to_le16(crc);
2050}
2051
feb0ab32 2052int ext4_group_desc_csum_verify(struct super_block *sb, __u32 block_group,
717d50e4
AD		 2053 struct ext4_group_desc *gdp)
2054{
feb0ab32
DW		 2055 if (ext4_has_group_desc_csum(sb) &&
2056 (gdp->bg_checksum != ext4_group_desc_csum(EXT4_SB(sb),
2057 block_group, gdp)))
717d50e4
AD		 2058 return 0;
2059
2060 return 1;
2061}
2062
feb0ab32
DW		 2063void ext4_group_desc_csum_set(struct super_block *sb, __u32 block_group,
2064 struct ext4_group_desc *gdp)
2065{
2066 if (!ext4_has_group_desc_csum(sb))
2067 return;
2068 gdp->bg_checksum = ext4_group_desc_csum(EXT4_SB(sb), block_group, gdp);
2069}
2070
ac27a0ec 2071/* Called at mount-time, super-block is locked */
bfff6873
LC		 2072static int ext4_check_descriptors(struct super_block *sb,
2073 ext4_group_t *first_not_zeroed)
ac27a0ec 2074{
617ba13b
MC		 2075 struct ext4_sb_info *sbi = EXT4_SB(sb);
2076 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
2077 ext4_fsblk_t last_block;
bd81d8ee
LV		 2078 ext4_fsblk_t block_bitmap;
2079 ext4_fsblk_t inode_bitmap;
2080 ext4_fsblk_t inode_table;
ce421581 2081 int flexbg_flag = 0;
bfff6873 2082 ext4_group_t i, grp = sbi->s_groups_count;
ac27a0ec 2083
ce421581
JS		 2084 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
2085 flexbg_flag = 1;
2086
af5bc92d 2087 ext4_debug("Checking group descriptors");
ac27a0ec 2088
197cd65a
AM		 2089 for (i = 0; i < sbi->s_groups_count; i++) {
2090 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
2091
ce421581 2092 if (i == sbi->s_groups_count - 1 || flexbg_flag)
bd81d8ee 2093 last_block = ext4_blocks_count(sbi->s_es) - 1;
ac27a0ec
DK		 2094 else
2095 last_block = first_block +
617ba13b 2096 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
ac27a0ec 2097
bfff6873
LC		 2098 if ((grp == sbi->s_groups_count) &&
2099 !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2100 grp = i;
2101
8fadc143 2102 block_bitmap = ext4_block_bitmap(sb, gdp);
2b2d6d01 2103 if (block_bitmap < first_block || block_bitmap > last_block) {
b31e1552 2104 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2105 "Block bitmap for group %u not in group "
b31e1552 2106 "(block %llu)!", i, block_bitmap);
ac27a0ec
DK		 2107 return 0;
2108 }
8fadc143 2109 inode_bitmap = ext4_inode_bitmap(sb, gdp);
2b2d6d01 2110 if (inode_bitmap < first_block || inode_bitmap > last_block) {
b31e1552 2111 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2112 "Inode bitmap for group %u not in group "
b31e1552 2113 "(block %llu)!", i, inode_bitmap);
ac27a0ec
DK		 2114 return 0;
2115 }
8fadc143 2116 inode_table = ext4_inode_table(sb, gdp);
bd81d8ee 2117 if (inode_table < first_block ||
2b2d6d01 2118 inode_table + sbi->s_itb_per_group - 1 > last_block) {
b31e1552 2119 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2120 "Inode table for group %u not in group "
b31e1552 2121 "(block %llu)!", i, inode_table);
ac27a0ec
DK		 2122 return 0;
2123 }
955ce5f5 2124 ext4_lock_group(sb, i);
feb0ab32 2125 if (!ext4_group_desc_csum_verify(sb, i, gdp)) {
b31e1552
ES		 2126 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2127 "Checksum for group %u failed (%u!=%u)",
2128 i, le16_to_cpu(ext4_group_desc_csum(sbi, i,
2129 gdp)), le16_to_cpu(gdp->bg_checksum));
7ee1ec4c 2130 if (!(sb->s_flags & MS_RDONLY)) {
955ce5f5 2131 ext4_unlock_group(sb, i);
8a266467 2132 return 0;
7ee1ec4c 2133 }
717d50e4 2134 }
955ce5f5 2135 ext4_unlock_group(sb, i);
ce421581
JS		 2136 if (!flexbg_flag)
2137 first_block += EXT4_BLOCKS_PER_GROUP(sb);
ac27a0ec 2138 }
bfff6873
LC		 2139 if (NULL != first_not_zeroed)
2140 *first_not_zeroed = grp;
ac27a0ec 2141
5dee5437
TT		 2142 ext4_free_blocks_count_set(sbi->s_es,
2143 EXT4_C2B(sbi, ext4_count_free_clusters(sb)));
0b8e58a1 2144 sbi->s_es->s_free_inodes_count =cpu_to_le32(ext4_count_free_inodes(sb));
ac27a0ec
DK		 2145 return 1;
2146}
2147
617ba13b 2148/* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
ac27a0ec
DK		 2149 * the superblock) which were deleted from all directories, but held open by
2150 * a process at the time of a crash. We walk the list and try to delete these
2151 * inodes at recovery time (only with a read-write filesystem).
2152 *
2153 * In order to keep the orphan inode chain consistent during traversal (in
2154 * case of crash during recovery), we link each inode into the superblock
2155 * orphan list_head and handle it the same way as an inode deletion during
2156 * normal operation (which journals the operations for us).
2157 *
2158 * We only do an iget() and an iput() on each inode, which is very safe if we
2159 * accidentally point at an in-use or already deleted inode. The worst that
2160 * can happen in this case is that we get a "bit already cleared" message from
617ba13b 2161 * ext4_free_inode(). The only reason we would point at a wrong inode is if
ac27a0ec
DK		 2162 * e2fsck was run on this filesystem, and it must have already done the orphan
2163 * inode cleanup for us, so we can safely abort without any further action.
2164 */
2b2d6d01
TT		 2165static void ext4_orphan_cleanup(struct super_block *sb,
2166 struct ext4_super_block *es)
ac27a0ec
DK		 2167{
2168 unsigned int s_flags = sb->s_flags;
2169 int nr_orphans = 0, nr_truncates = 0;
2170#ifdef CONFIG_QUOTA
2171 int i;
2172#endif
2173 if (!es->s_last_orphan) {
2174 jbd_debug(4, "no orphan inodes to clean up\n");
2175 return;
2176 }
2177
a8f48a95 2178 if (bdev_read_only(sb->s_bdev)) {
b31e1552
ES		 2179 ext4_msg(sb, KERN_ERR, "write access "
2180 "unavailable, skipping orphan cleanup");
a8f48a95
ES		 2181 return;
2182 }
2183
d39195c3
AG		 2184 /* Check if feature set would not allow a r/w mount */
2185 if (!ext4_feature_set_ok(sb, 0)) {
2186 ext4_msg(sb, KERN_INFO, "Skipping orphan cleanup due to "
2187 "unknown ROCOMPAT features");
2188 return;
2189 }
2190
617ba13b 2191 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
c25f9bc6
ES		 2192 /* don't clear list on RO mount w/ errors */
2193 if (es->s_last_orphan && !(s_flags & MS_RDONLY)) {
ac27a0ec
DK		 2194 jbd_debug(1, "Errors on filesystem, "
2195 "clearing orphan list.\n");
c25f9bc6
ES		 2196 es->s_last_orphan = 0;
2197 }
ac27a0ec
DK		 2198 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2199 return;
2200 }
2201
2202 if (s_flags & MS_RDONLY) {
b31e1552 2203 ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
ac27a0ec
DK		 2204 sb->s_flags &= ~MS_RDONLY;
2205 }
2206#ifdef CONFIG_QUOTA
2207 /* Needed for iput() to work correctly and not trash data */
2208 sb->s_flags |= MS_ACTIVE;
2209 /* Turn on quotas so that they are updated correctly */
2210 for (i = 0; i < MAXQUOTAS; i++) {
617ba13b
MC		 2211 if (EXT4_SB(sb)->s_qf_names[i]) {
2212 int ret = ext4_quota_on_mount(sb, i);
ac27a0ec 2213 if (ret < 0)
b31e1552
ES		 2214 ext4_msg(sb, KERN_ERR,
2215 "Cannot turn on journaled "
2216 "quota: error %d", ret);
ac27a0ec
DK		 2217 }
2218 }
2219#endif
2220
2221 while (es->s_last_orphan) {
2222 struct inode *inode;
2223
97bd42b9
JB		 2224 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
2225 if (IS_ERR(inode)) {
ac27a0ec
DK		 2226 es->s_last_orphan = 0;
2227 break;
2228 }
2229
617ba13b 2230 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
871a2931 2231 dquot_initialize(inode);
ac27a0ec 2232 if (inode->i_nlink) {
566370a2
PT		 2233 if (test_opt(sb, DEBUG))
2234 ext4_msg(sb, KERN_DEBUG,
2235 "%s: truncating inode %lu to %lld bytes",
2236 __func__, inode->i_ino, inode->i_size);
e5f8eab8 2237 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
ac27a0ec 2238 inode->i_ino, inode->i_size);
721e3eba 2239 mutex_lock(&inode->i_mutex);
55f252c9 2240 truncate_inode_pages(inode->i_mapping, inode->i_size);
617ba13b 2241 ext4_truncate(inode);
721e3eba 2242 mutex_unlock(&inode->i_mutex);
ac27a0ec
DK		 2243 nr_truncates++;
2244 } else {
566370a2
PT		 2245 if (test_opt(sb, DEBUG))
2246 ext4_msg(sb, KERN_DEBUG,
2247 "%s: deleting unreferenced inode %lu",
2248 __func__, inode->i_ino);
ac27a0ec
DK		 2249 jbd_debug(2, "deleting unreferenced inode %lu\n",
2250 inode->i_ino);
2251 nr_orphans++;
2252 }
2253 iput(inode); /* The delete magic happens here! */
2254 }
2255
2b2d6d01 2256#define PLURAL(x) (x), ((x) == 1) ? "" : "s"
ac27a0ec
DK		 2257
2258 if (nr_orphans)
b31e1552
ES		 2259 ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
2260 PLURAL(nr_orphans));
ac27a0ec 2261 if (nr_truncates)
b31e1552
ES		 2262 ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
2263 PLURAL(nr_truncates));
ac27a0ec
DK		 2264#ifdef CONFIG_QUOTA
2265 /* Turn quotas off */
2266 for (i = 0; i < MAXQUOTAS; i++) {
2267 if (sb_dqopt(sb)->files[i])
287a8095 2268 dquot_quota_off(sb, i);
ac27a0ec
DK		 2269 }
2270#endif
2271 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
2272}
0b8e58a1 2273
cd2291a4
ES		 2274/*
2275 * Maximal extent format file size.
2276 * Resulting logical blkno at s_maxbytes must fit in our on-disk
2277 * extent format containers, within a sector_t, and within i_blocks
2278 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
2279 * so that won't be a limiting factor.
2280 *
f17722f9
LC		 2281 * However there is other limiting factor. We do store extents in the form
2282 * of starting block and length, hence the resulting length of the extent
2283 * covering maximum file size must fit into on-disk format containers as
2284 * well. Given that length is always by 1 unit bigger than max unit (because
2285 * we count 0 as well) we have to lower the s_maxbytes by one fs block.
2286 *
cd2291a4
ES		 2287 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
2288 */
f287a1a5 2289static loff_t ext4_max_size(int blkbits, int has_huge_files)
cd2291a4
ES		 2290{
2291 loff_t res;
2292 loff_t upper_limit = MAX_LFS_FILESIZE;
2293
2294 /* small i_blocks in vfs inode? */
f287a1a5 2295 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
cd2291a4 2296 /*
90c699a9 2297 * CONFIG_LBDAF is not enabled implies the inode
cd2291a4
ES		 2298 * i_block represent total blocks in 512 bytes
2299 * 32 == size of vfs inode i_blocks * 8
2300 */
2301 upper_limit = (1LL << 32) - 1;
2302
2303 /* total blocks in file system block size */
2304 upper_limit >>= (blkbits - 9);
2305 upper_limit <<= blkbits;
2306 }
2307
f17722f9
LC		 2308 /*
2309 * 32-bit extent-start container, ee_block. We lower the maxbytes
2310 * by one fs block, so ee_len can cover the extent of maximum file
2311 * size
2312 */
2313 res = (1LL << 32) - 1;
cd2291a4 2314 res <<= blkbits;
cd2291a4
ES		 2315
2316 /* Sanity check against vm- & vfs- imposed limits */
2317 if (res > upper_limit)
2318 res = upper_limit;
2319
2320 return res;
2321}
ac27a0ec 2322
ac27a0ec 2323/*
cd2291a4 2324 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
0fc1b451
AK		 2325 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2326 * We need to be 1 filesystem block less than the 2^48 sector limit.
ac27a0ec 2327 */
f287a1a5 2328static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
ac27a0ec 2329{
617ba13b 2330 loff_t res = EXT4_NDIR_BLOCKS;
0fc1b451
AK		 2331 int meta_blocks;
2332 loff_t upper_limit;
0b8e58a1
AD		 2333 /* This is calculated to be the largest file size for a dense, block
2334 * mapped file such that the file's total number of 512-byte sectors,
2335 * including data and all indirect blocks, does not exceed (2^48 - 1).
2336 *
2337 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2338 * number of 512-byte sectors of the file.
0fc1b451
AK		 2339 */
2340
f287a1a5 2341 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
0fc1b451 2342 /*
90c699a9 2343 * !has_huge_files or CONFIG_LBDAF not enabled implies that
0b8e58a1
AD		 2344 * the inode i_block field represents total file blocks in
2345 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
0fc1b451
AK		 2346 */
2347 upper_limit = (1LL << 32) - 1;
2348
2349 /* total blocks in file system block size */
2350 upper_limit >>= (bits - 9);
2351
2352 } else {
8180a562
AK		 2353 /*
2354 * We use 48 bit ext4_inode i_blocks
2355 * With EXT4_HUGE_FILE_FL set the i_blocks
2356 * represent total number of blocks in
2357 * file system block size
2358 */
0fc1b451
AK		 2359 upper_limit = (1LL << 48) - 1;
2360
0fc1b451
AK		 2361 }
2362
2363 /* indirect blocks */
2364 meta_blocks = 1;
2365 /* double indirect blocks */
2366 meta_blocks += 1 + (1LL << (bits-2));
2367 /* tripple indirect blocks */
2368 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
2369
2370 upper_limit -= meta_blocks;
2371 upper_limit <<= bits;
ac27a0ec
DK		 2372
2373 res += 1LL << (bits-2);
2374 res += 1LL << (2*(bits-2));
2375 res += 1LL << (3*(bits-2));
2376 res <<= bits;
2377 if (res > upper_limit)
2378 res = upper_limit;
0fc1b451
AK		 2379
2380 if (res > MAX_LFS_FILESIZE)
2381 res = MAX_LFS_FILESIZE;
2382
ac27a0ec
DK		 2383 return res;
2384}
2385
617ba13b 2386static ext4_fsblk_t descriptor_loc(struct super_block *sb,
0b8e58a1 2387 ext4_fsblk_t logical_sb_block, int nr)
ac27a0ec 2388{
617ba13b 2389 struct ext4_sb_info *sbi = EXT4_SB(sb);
fd2d4291 2390 ext4_group_t bg, first_meta_bg;
ac27a0ec
DK		 2391 int has_super = 0;
2392
2393 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
2394
617ba13b 2395 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
ac27a0ec 2396 nr < first_meta_bg)
70bbb3e0 2397 return logical_sb_block + nr + 1;
ac27a0ec 2398 bg = sbi->s_desc_per_block * nr;
617ba13b 2399 if (ext4_bg_has_super(sb, bg))
ac27a0ec 2400 has_super = 1;
0b8e58a1 2401
617ba13b 2402 return (has_super + ext4_group_first_block_no(sb, bg));
ac27a0ec
DK		 2403}
2404
c9de560d
AT		 2405/**
2406 * ext4_get_stripe_size: Get the stripe size.
2407 * @sbi: In memory super block info
2408 *
2409 * If we have specified it via mount option, then
2410 * use the mount option value. If the value specified at mount time is
2411 * greater than the blocks per group use the super block value.
2412 * If the super block value is greater than blocks per group return 0.
2413 * Allocator needs it be less than blocks per group.
2414 *
2415 */
2416static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
2417{
2418 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
2419 unsigned long stripe_width =
2420 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
3eb08658 2421 int ret;
c9de560d
AT		 2422
2423 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
3eb08658
DE		 2424 ret = sbi->s_stripe;
2425 else if (stripe_width <= sbi->s_blocks_per_group)
2426 ret = stripe_width;
2427 else if (stride <= sbi->s_blocks_per_group)
2428 ret = stride;
2429 else
2430 ret = 0;
c9de560d 2431
3eb08658
DE		 2432 /*
2433 * If the stripe width is 1, this makes no sense and
2434 * we set it to 0 to turn off stripe handling code.
2435 */
2436 if (ret <= 1)
2437 ret = 0;
c9de560d 2438
3eb08658 2439 return ret;
c9de560d 2440}
ac27a0ec 2441
3197ebdb
TT		 2442/* sysfs supprt */
2443
2444struct ext4_attr {
2445 struct attribute attr;
2446 ssize_t (*show)(struct ext4_attr *, struct ext4_sb_info *, char *);
60e6679e 2447 ssize_t (*store)(struct ext4_attr *, struct ext4_sb_info *,
3197ebdb 2448 const char *, size_t);
f2d50a65
JK		 2449 union {
2450 int offset;
2451 int deprecated_val;
2452 } u;
3197ebdb
TT		 2453};
2454
27dd4385
LC		 2455static int parse_strtoull(const char *buf,
2456 unsigned long long max, unsigned long long *value)
2457{
2458 int ret;
2459
2460 ret = kstrtoull(skip_spaces(buf), 0, value);
2461 if (!ret && *value > max)
2462 ret = -EINVAL;
2463 return ret;
2464}
2465
3197ebdb
TT		 2466static ssize_t delayed_allocation_blocks_show(struct ext4_attr *a,
2467 struct ext4_sb_info *sbi,
2468 char *buf)
2469{
2470 return snprintf(buf, PAGE_SIZE, "%llu\n",
7b415bf6
AK		 2471 (s64) EXT4_C2B(sbi,
2472 percpu_counter_sum(&sbi->s_dirtyclusters_counter)));
3197ebdb
TT		 2473}
2474
2475static ssize_t session_write_kbytes_show(struct ext4_attr *a,
2476 struct ext4_sb_info *sbi, char *buf)
2477{
2478 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2479
f613dfcb
TT		 2480 if (!sb->s_bdev->bd_part)
2481 return snprintf(buf, PAGE_SIZE, "0\n");
3197ebdb
TT		 2482 return snprintf(buf, PAGE_SIZE, "%lu\n",
2483 (part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
2484 sbi->s_sectors_written_start) >> 1);
2485}
2486
2487static ssize_t lifetime_write_kbytes_show(struct ext4_attr *a,
2488 struct ext4_sb_info *sbi, char *buf)
2489{
2490 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2491
f613dfcb
TT		 2492 if (!sb->s_bdev->bd_part)
2493 return snprintf(buf, PAGE_SIZE, "0\n");
3197ebdb 2494 return snprintf(buf, PAGE_SIZE, "%llu\n",
a6b43e38 2495 (unsigned long long)(sbi->s_kbytes_written +
3197ebdb 2496 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
a6b43e38 2497 EXT4_SB(sb)->s_sectors_written_start) >> 1)));
3197ebdb
TT		 2498}
2499
2500static ssize_t inode_readahead_blks_store(struct ext4_attr *a,
2501 struct ext4_sb_info *sbi,
2502 const char *buf, size_t count)
2503{
2504 unsigned long t;
e1091b15 2505 int ret;
3197ebdb 2506
e1091b15
LC		 2507 ret = kstrtoul(skip_spaces(buf), 0, &t);
2508 if (ret)
2509 return ret;
3197ebdb 2510
e1091b15 2511 if (t && (!is_power_of_2(t) || t > 0x40000000))
3197ebdb
TT		 2512 return -EINVAL;
2513
2514 sbi->s_inode_readahead_blks = t;
2515 return count;
2516}
2517
2518static ssize_t sbi_ui_show(struct ext4_attr *a,
0b8e58a1 2519 struct ext4_sb_info *sbi, char *buf)
3197ebdb 2520{
f2d50a65 2521 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->u.offset);
3197ebdb
TT		 2522
2523 return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
2524}
2525
2526static ssize_t sbi_ui_store(struct ext4_attr *a,
2527 struct ext4_sb_info *sbi,
2528 const char *buf, size_t count)
2529{
f2d50a65 2530 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->u.offset);
3197ebdb 2531 unsigned long t;
e1091b15 2532 int ret;
3197ebdb 2533
e1091b15
LC		 2534 ret = kstrtoul(skip_spaces(buf), 0, &t);
2535 if (ret)
2536 return ret;
3197ebdb
TT		 2537 *ui = t;
2538 return count;
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
TT		 2593}
2594#define EXT4_ATTR(name, mode, show, store) \
2595static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store)
2596
857ac889 2597#define EXT4_INFO_ATTR(name) EXT4_ATTR(name, 0444, NULL, NULL)
3197ebdb
TT		 2598#define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL)
2599#define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store)
2600#define EXT4_RW_ATTR_SBI_UI(name, elname) \
2601 EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname)
2602#define ATTR_LIST(name) &ext4_attr_##name.attr
f2d50a65
JK		 2603#define EXT4_DEPRECATED_ATTR(_name, _val) \
2604static struct ext4_attr ext4_attr_##_name = { \
2605 .attr = {.name = __stringify(_name), .mode = 0444 }, \
2606 .show = sbi_deprecated_show, \
2607 .u = { \
2608 .deprecated_val = _val, \
2609 }, \
2610}
3197ebdb
TT		 2611
2612EXT4_RO_ATTR(delayed_allocation_blocks);
2613EXT4_RO_ATTR(session_write_kbytes);
2614EXT4_RO_ATTR(lifetime_write_kbytes);
27dd4385 2615EXT4_RW_ATTR(reserved_clusters);
3197ebdb
TT		 2616EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, sbi_ui_show,
2617 inode_readahead_blks_store, s_inode_readahead_blks);
11013911 2618EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal);
3197ebdb
TT		 2619EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats);
2620EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan);
2621EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan);
2622EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs);
2623EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request);
2624EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc);
f2d50a65 2625EXT4_DEPRECATED_ATTR(max_writeback_mb_bump, 128);
67a5da56 2626EXT4_RW_ATTR_SBI_UI(extent_max_zeroout_kb, s_extent_max_zeroout_kb);
2c0544b2 2627EXT4_ATTR(trigger_fs_error, 0200, NULL, trigger_test_error);
efbed4dc
TT		 2628EXT4_RW_ATTR_SBI_UI(err_ratelimit_interval_ms, s_err_ratelimit_state.interval);
2629EXT4_RW_ATTR_SBI_UI(err_ratelimit_burst, s_err_ratelimit_state.burst);
2630EXT4_RW_ATTR_SBI_UI(warning_ratelimit_interval_ms, s_warning_ratelimit_state.interval);
2631EXT4_RW_ATTR_SBI_UI(warning_ratelimit_burst, s_warning_ratelimit_state.burst);
2632EXT4_RW_ATTR_SBI_UI(msg_ratelimit_interval_ms, s_msg_ratelimit_state.interval);
2633EXT4_RW_ATTR_SBI_UI(msg_ratelimit_burst, s_msg_ratelimit_state.burst);
3197ebdb
TT		 2634
2635static struct attribute *ext4_attrs[] = {
2636 ATTR_LIST(delayed_allocation_blocks),
2637 ATTR_LIST(session_write_kbytes),
2638 ATTR_LIST(lifetime_write_kbytes),
27dd4385 2639 ATTR_LIST(reserved_clusters),
3197ebdb 2640 ATTR_LIST(inode_readahead_blks),
11013911 2641 ATTR_LIST(inode_goal),
3197ebdb
TT		 2642 ATTR_LIST(mb_stats),
2643 ATTR_LIST(mb_max_to_scan),
2644 ATTR_LIST(mb_min_to_scan),
2645 ATTR_LIST(mb_order2_req),
2646 ATTR_LIST(mb_stream_req),
2647 ATTR_LIST(mb_group_prealloc),
55138e0b 2648 ATTR_LIST(max_writeback_mb_bump),
67a5da56 2649 ATTR_LIST(extent_max_zeroout_kb),
2c0544b2 2650 ATTR_LIST(trigger_fs_error),
efbed4dc
TT		 2651 ATTR_LIST(err_ratelimit_interval_ms),
2652 ATTR_LIST(err_ratelimit_burst),
2653 ATTR_LIST(warning_ratelimit_interval_ms),
2654 ATTR_LIST(warning_ratelimit_burst),
2655 ATTR_LIST(msg_ratelimit_interval_ms),
2656 ATTR_LIST(msg_ratelimit_burst),
3197ebdb
TT		 2657 NULL,
2658};
2659
857ac889
LC		 2660/* Features this copy of ext4 supports */
2661EXT4_INFO_ATTR(lazy_itable_init);
27ee40df 2662EXT4_INFO_ATTR(batched_discard);
5e7bbef1 2663EXT4_INFO_ATTR(meta_bg_resize);
857ac889
LC		 2664
2665static struct attribute *ext4_feat_attrs[] = {
2666 ATTR_LIST(lazy_itable_init),
27ee40df 2667 ATTR_LIST(batched_discard),
5e7bbef1 2668 ATTR_LIST(meta_bg_resize),
857ac889
LC		 2669 NULL,
2670};
2671
3197ebdb
TT		 2672static ssize_t ext4_attr_show(struct kobject *kobj,
2673 struct attribute *attr, char *buf)
2674{
2675 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2676 s_kobj);
2677 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2678
2679 return a->show ? a->show(a, sbi, buf) : 0;
2680}
2681
2682static ssize_t ext4_attr_store(struct kobject *kobj,
2683 struct attribute *attr,
2684 const char *buf, size_t len)
2685{
2686 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2687 s_kobj);
2688 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2689
2690 return a->store ? a->store(a, sbi, buf, len) : 0;
2691}
2692
2693static void ext4_sb_release(struct kobject *kobj)
2694{
2695 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2696 s_kobj);
2697 complete(&sbi->s_kobj_unregister);
2698}
2699
52cf25d0 2700static const struct sysfs_ops ext4_attr_ops = {
3197ebdb
TT		 2701 .show = ext4_attr_show,
2702 .store = ext4_attr_store,
2703};
2704
2705static struct kobj_type ext4_ktype = {
2706 .default_attrs = ext4_attrs,
2707 .sysfs_ops = &ext4_attr_ops,
2708 .release = ext4_sb_release,
2709};
2710
857ac889
LC		 2711static void ext4_feat_release(struct kobject *kobj)
2712{
2713 complete(&ext4_feat->f_kobj_unregister);
2714}
2715
2716static struct kobj_type ext4_feat_ktype = {
2717 .default_attrs = ext4_feat_attrs,
2718 .sysfs_ops = &ext4_attr_ops,
2719 .release = ext4_feat_release,
2720};
2721
a13fb1a4
ES		 2722/*
2723 * Check whether this filesystem can be mounted based on
2724 * the features present and the RDONLY/RDWR mount requested.
2725 * Returns 1 if this filesystem can be mounted as requested,
2726 * 0 if it cannot be.
2727 */
2728static int ext4_feature_set_ok(struct super_block *sb, int readonly)
2729{
2730 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP)) {
2731 ext4_msg(sb, KERN_ERR,
2732 "Couldn't mount because of "
2733 "unsupported optional features (%x)",
2734 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
2735 ~EXT4_FEATURE_INCOMPAT_SUPP));
2736 return 0;
2737 }
2738
2739 if (readonly)
2740 return 1;
2741
2742 /* Check that feature set is OK for a read-write mount */
2743 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP)) {
2744 ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of "
2745 "unsupported optional features (%x)",
2746 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
2747 ~EXT4_FEATURE_RO_COMPAT_SUPP));
2748 return 0;
2749 }
2750 /*
2751 * Large file size enabled file system can only be mounted
2752 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
2753 */
2754 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) {
2755 if (sizeof(blkcnt_t) < sizeof(u64)) {
2756 ext4_msg(sb, KERN_ERR, "Filesystem with huge files "
2757 "cannot be mounted RDWR without "
2758 "CONFIG_LBDAF");
2759 return 0;
2760 }
2761 }
bab08ab9
TT		 2762 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_BIGALLOC) &&
2763 !EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS)) {
2764 ext4_msg(sb, KERN_ERR,
2765 "Can't support bigalloc feature without "
2766 "extents feature\n");
2767 return 0;
2768 }
7c319d32
AK		 2769
2770#ifndef CONFIG_QUOTA
2771 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) &&
2772 !readonly) {
2773 ext4_msg(sb, KERN_ERR,
2774 "Filesystem with quota feature cannot be mounted RDWR "
2775 "without CONFIG_QUOTA");
2776 return 0;
2777 }
2778#endif /* CONFIG_QUOTA */
a13fb1a4
ES		 2779 return 1;
2780}
2781
66e61a9e
TT		 2782/*
2783 * This function is called once a day if we have errors logged
2784 * on the file system
2785 */
2786static void print_daily_error_info(unsigned long arg)
2787{
2788 struct super_block *sb = (struct super_block *) arg;
2789 struct ext4_sb_info *sbi;
2790 struct ext4_super_block *es;
2791
2792 sbi = EXT4_SB(sb);
2793 es = sbi->s_es;
2794
2795 if (es->s_error_count)
2796 ext4_msg(sb, KERN_NOTICE, "error count: %u",
2797 le32_to_cpu(es->s_error_count));
2798 if (es->s_first_error_time) {
2799 printk(KERN_NOTICE "EXT4-fs (%s): initial error at %u: %.*s:%d",
2800 sb->s_id, le32_to_cpu(es->s_first_error_time),
2801 (int) sizeof(es->s_first_error_func),
2802 es->s_first_error_func,
2803 le32_to_cpu(es->s_first_error_line));
2804 if (es->s_first_error_ino)
2805 printk(": inode %u",
2806 le32_to_cpu(es->s_first_error_ino));
2807 if (es->s_first_error_block)
2808 printk(": block %llu", (unsigned long long)
2809 le64_to_cpu(es->s_first_error_block));
2810 printk("\n");
2811 }
2812 if (es->s_last_error_time) {
2813 printk(KERN_NOTICE "EXT4-fs (%s): last error at %u: %.*s:%d",
2814 sb->s_id, le32_to_cpu(es->s_last_error_time),
2815 (int) sizeof(es->s_last_error_func),
2816 es->s_last_error_func,
2817 le32_to_cpu(es->s_last_error_line));
2818 if (es->s_last_error_ino)
2819 printk(": inode %u",
2820 le32_to_cpu(es->s_last_error_ino));
2821 if (es->s_last_error_block)
2822 printk(": block %llu", (unsigned long long)
2823 le64_to_cpu(es->s_last_error_block));
2824 printk("\n");
2825 }
2826 mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ); /* Once a day */
2827}
2828
bfff6873
LC		 2829/* Find next suitable group and run ext4_init_inode_table */
2830static int ext4_run_li_request(struct ext4_li_request *elr)
2831{
2832 struct ext4_group_desc *gdp = NULL;
2833 ext4_group_t group, ngroups;
2834 struct super_block *sb;
2835 unsigned long timeout = 0;
2836 int ret = 0;
2837
2838 sb = elr->lr_super;
2839 ngroups = EXT4_SB(sb)->s_groups_count;
2840
8e8ad8a5 2841 sb_start_write(sb);
bfff6873
LC		 2842 for (group = elr->lr_next_group; group < ngroups; group++) {
2843 gdp = ext4_get_group_desc(sb, group, NULL);
2844 if (!gdp) {
2845 ret = 1;
2846 break;
2847 }
2848
2849 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2850 break;
2851 }
2852
7f511862 2853 if (group >= ngroups)
bfff6873
LC		 2854 ret = 1;
2855
2856 if (!ret) {
2857 timeout = jiffies;
2858 ret = ext4_init_inode_table(sb, group,
2859 elr->lr_timeout ? 0 : 1);
2860 if (elr->lr_timeout == 0) {
51ce6511
LC		 2861 timeout = (jiffies - timeout) *
2862 elr->lr_sbi->s_li_wait_mult;
bfff6873
LC		 2863 elr->lr_timeout = timeout;
2864 }
2865 elr->lr_next_sched = jiffies + elr->lr_timeout;
2866 elr->lr_next_group = group + 1;
2867 }
8e8ad8a5 2868 sb_end_write(sb);
bfff6873
LC		 2869
2870 return ret;
2871}
2872
2873/*
2874 * Remove lr_request from the list_request and free the
4ed5c033 2875 * request structure. Should be called with li_list_mtx held
bfff6873
LC		 2876 */
2877static void ext4_remove_li_request(struct ext4_li_request *elr)
2878{
2879 struct ext4_sb_info *sbi;
2880
2881 if (!elr)
2882 return;
2883
2884 sbi = elr->lr_sbi;
2885
2886 list_del(&elr->lr_request);
2887 sbi->s_li_request = NULL;
2888 kfree(elr);
2889}
2890
2891static void ext4_unregister_li_request(struct super_block *sb)
2892{
1bb933fb
LC		 2893 mutex_lock(&ext4_li_mtx);
2894 if (!ext4_li_info) {
2895 mutex_unlock(&ext4_li_mtx);
bfff6873 2896 return;
1bb933fb 2897 }
bfff6873
LC		 2898
2899 mutex_lock(&ext4_li_info->li_list_mtx);
1bb933fb 2900 ext4_remove_li_request(EXT4_SB(sb)->s_li_request);
bfff6873 2901 mutex_unlock(&ext4_li_info->li_list_mtx);
1bb933fb 2902 mutex_unlock(&ext4_li_mtx);
bfff6873
LC		 2903}
2904
8f1f7453
ES		 2905static struct task_struct *ext4_lazyinit_task;
2906
bfff6873
LC		 2907/*
2908 * This is the function where ext4lazyinit thread lives. It walks
2909 * through the request list searching for next scheduled filesystem.
2910 * When such a fs is found, run the lazy initialization request
2911 * (ext4_rn_li_request) and keep track of the time spend in this
2912 * function. Based on that time we compute next schedule time of
2913 * the request. When walking through the list is complete, compute
2914 * next waking time and put itself into sleep.
2915 */
2916static int ext4_lazyinit_thread(void *arg)
2917{
2918 struct ext4_lazy_init *eli = (struct ext4_lazy_init *)arg;
2919 struct list_head *pos, *n;
2920 struct ext4_li_request *elr;
4ed5c033 2921 unsigned long next_wakeup, cur;
bfff6873
LC		 2922
2923 BUG_ON(NULL == eli);
2924
bfff6873
LC		 2925cont_thread:
2926 while (true) {
2927 next_wakeup = MAX_JIFFY_OFFSET;
2928
2929 mutex_lock(&eli->li_list_mtx);
2930 if (list_empty(&eli->li_request_list)) {
2931 mutex_unlock(&eli->li_list_mtx);
2932 goto exit_thread;
2933 }
2934
2935 list_for_each_safe(pos, n, &eli->li_request_list) {
2936 elr = list_entry(pos, struct ext4_li_request,
2937 lr_request);
2938
b2c78cd0
TT		 2939 if (time_after_eq(jiffies, elr->lr_next_sched)) {
2940 if (ext4_run_li_request(elr) != 0) {
2941 /* error, remove the lazy_init job */
2942 ext4_remove_li_request(elr);
2943 continue;
2944 }
bfff6873
LC		 2945 }
2946
2947 if (time_before(elr->lr_next_sched, next_wakeup))
2948 next_wakeup = elr->lr_next_sched;
2949 }
2950 mutex_unlock(&eli->li_list_mtx);
2951
a0acae0e 2952 try_to_freeze();
bfff6873 2953
4ed5c033
LC		 2954 cur = jiffies;
2955 if ((time_after_eq(cur, next_wakeup)) ||
f4245bd4 2956 (MAX_JIFFY_OFFSET == next_wakeup)) {
bfff6873
LC		 2957 cond_resched();
2958 continue;
2959 }
2960
4ed5c033
LC		 2961 schedule_timeout_interruptible(next_wakeup - cur);
2962
8f1f7453
ES		 2963 if (kthread_should_stop()) {
2964 ext4_clear_request_list();
2965 goto exit_thread;
2966 }
bfff6873
LC		 2967 }
2968
2969exit_thread:
2970 /*
2971 * It looks like the request list is empty, but we need
2972 * to check it under the li_list_mtx lock, to prevent any
2973 * additions into it, and of course we should lock ext4_li_mtx
2974 * to atomically free the list and ext4_li_info, because at
2975 * this point another ext4 filesystem could be registering
2976 * new one.
2977 */
2978 mutex_lock(&ext4_li_mtx);
2979 mutex_lock(&eli->li_list_mtx);
2980 if (!list_empty(&eli->li_request_list)) {
2981 mutex_unlock(&eli->li_list_mtx);
2982 mutex_unlock(&ext4_li_mtx);
2983 goto cont_thread;
2984 }
2985 mutex_unlock(&eli->li_list_mtx);
bfff6873
LC		 2986 kfree(ext4_li_info);
2987 ext4_li_info = NULL;
2988 mutex_unlock(&ext4_li_mtx);
2989
2990 return 0;
2991}
2992
2993static void ext4_clear_request_list(void)
2994{
2995 struct list_head *pos, *n;
2996 struct ext4_li_request *elr;
2997
2998 mutex_lock(&ext4_li_info->li_list_mtx);
bfff6873
LC		 2999 list_for_each_safe(pos, n, &ext4_li_info->li_request_list) {
3000 elr = list_entry(pos, struct ext4_li_request,
3001 lr_request);
3002 ext4_remove_li_request(elr);
3003 }
3004 mutex_unlock(&ext4_li_info->li_list_mtx);
3005}
3006
3007static int ext4_run_lazyinit_thread(void)
3008{
8f1f7453
ES		 3009 ext4_lazyinit_task = kthread_run(ext4_lazyinit_thread,
3010 ext4_li_info, "ext4lazyinit");
3011 if (IS_ERR(ext4_lazyinit_task)) {
3012 int err = PTR_ERR(ext4_lazyinit_task);
bfff6873 3013 ext4_clear_request_list();
bfff6873
LC		 3014 kfree(ext4_li_info);
3015 ext4_li_info = NULL;
92b97816 3016 printk(KERN_CRIT "EXT4-fs: error %d creating inode table "
bfff6873
LC		 3017 "initialization thread\n",
3018 err);
3019 return err;
3020 }
3021 ext4_li_info->li_state |= EXT4_LAZYINIT_RUNNING;
bfff6873
LC		 3022 return 0;
3023}
3024
3025/*
3026 * Check whether it make sense to run itable init. thread or not.
3027 * If there is at least one uninitialized inode table, return
3028 * corresponding group number, else the loop goes through all
3029 * groups and return total number of groups.
3030 */
3031static ext4_group_t ext4_has_uninit_itable(struct super_block *sb)
3032{
3033 ext4_group_t group, ngroups = EXT4_SB(sb)->s_groups_count;
3034 struct ext4_group_desc *gdp = NULL;
3035
3036 for (group = 0; group < ngroups; group++) {
3037 gdp = ext4_get_group_desc(sb, group, NULL);
3038 if (!gdp)
3039 continue;
3040
3041 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
3042 break;
3043 }
3044
3045 return group;
3046}
3047
3048static int ext4_li_info_new(void)
3049{
3050 struct ext4_lazy_init *eli = NULL;
3051
3052 eli = kzalloc(sizeof(*eli), GFP_KERNEL);
3053 if (!eli)
3054 return -ENOMEM;
3055
bfff6873
LC		 3056 INIT_LIST_HEAD(&eli->li_request_list);
3057 mutex_init(&eli->li_list_mtx);
3058
bfff6873
LC		 3059 eli->li_state |= EXT4_LAZYINIT_QUIT;
3060
3061 ext4_li_info = eli;
3062
3063 return 0;
3064}
3065
3066static struct ext4_li_request *ext4_li_request_new(struct super_block *sb,
3067 ext4_group_t start)
3068{
3069 struct ext4_sb_info *sbi = EXT4_SB(sb);
3070 struct ext4_li_request *elr;
bfff6873
LC		 3071
3072 elr = kzalloc(sizeof(*elr), GFP_KERNEL);
3073 if (!elr)
3074 return NULL;
3075
3076 elr->lr_super = sb;
3077 elr->lr_sbi = sbi;
3078 elr->lr_next_group = start;
3079
3080 /*
3081 * Randomize first schedule time of the request to
3082 * spread the inode table initialization requests
3083 * better.
3084 */
dd1f723b
TT		 3085 elr->lr_next_sched = jiffies + (prandom_u32() %
3086 (EXT4_DEF_LI_MAX_START_DELAY * HZ));
bfff6873
LC		 3087 return elr;
3088}
3089
7f511862
TT		 3090int ext4_register_li_request(struct super_block *sb,
3091 ext4_group_t first_not_zeroed)
bfff6873
LC		 3092{
3093 struct ext4_sb_info *sbi = EXT4_SB(sb);
7f511862 3094 struct ext4_li_request *elr = NULL;
bfff6873 3095 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
6c5a6cb9 3096 int ret = 0;
bfff6873 3097
7f511862 3098 mutex_lock(&ext4_li_mtx);
51ce6511
LC		 3099 if (sbi->s_li_request != NULL) {
3100 /*
3101 * Reset timeout so it can be computed again, because
3102 * s_li_wait_mult might have changed.
3103 */
3104 sbi->s_li_request->lr_timeout = 0;
7f511862 3105 goto out;
51ce6511 3106 }
bfff6873
LC		 3107
3108 if (first_not_zeroed == ngroups ||
3109 (sb->s_flags & MS_RDONLY) ||
55ff3840 3110 !test_opt(sb, INIT_INODE_TABLE))
7f511862 3111 goto out;
bfff6873
LC		 3112
3113 elr = ext4_li_request_new(sb, first_not_zeroed);
7f511862
TT		 3114 if (!elr) {
3115 ret = -ENOMEM;
3116 goto out;
3117 }
bfff6873
LC		 3118
3119 if (NULL == ext4_li_info) {
3120 ret = ext4_li_info_new();
3121 if (ret)
3122 goto out;
3123 }
3124
3125 mutex_lock(&ext4_li_info->li_list_mtx);
3126 list_add(&elr->lr_request, &ext4_li_info->li_request_list);
3127 mutex_unlock(&ext4_li_info->li_list_mtx);
3128
3129 sbi->s_li_request = elr;
46e4690b
TM		 3130 /*
3131 * set elr to NULL here since it has been inserted to
3132 * the request_list and the removal and free of it is
3133 * handled by ext4_clear_request_list from now on.
3134 */
3135 elr = NULL;
bfff6873
LC		 3136
3137 if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) {
3138 ret = ext4_run_lazyinit_thread();
3139 if (ret)
3140 goto out;
3141 }
bfff6873 3142out:
beed5ecb
NK		 3143 mutex_unlock(&ext4_li_mtx);
3144 if (ret)
bfff6873 3145 kfree(elr);
bfff6873
LC		 3146 return ret;
3147}
3148
3149/*
3150 * We do not need to lock anything since this is called on
3151 * module unload.
3152 */
3153static void ext4_destroy_lazyinit_thread(void)
3154{
3155 /*
3156 * If thread exited earlier
3157 * there's nothing to be done.
3158 */
8f1f7453 3159 if (!ext4_li_info || !ext4_lazyinit_task)
bfff6873
LC		 3160 return;
3161
8f1f7453 3162 kthread_stop(ext4_lazyinit_task);
bfff6873
LC		 3163}
3164
25ed6e8a
DW		 3165static int set_journal_csum_feature_set(struct super_block *sb)
3166{
3167 int ret = 1;
3168 int compat, incompat;
3169 struct ext4_sb_info *sbi = EXT4_SB(sb);
3170
3171 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3172 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) {
3173 /* journal checksum v2 */
3174 compat = 0;
3175 incompat = JBD2_FEATURE_INCOMPAT_CSUM_V2;
3176 } else {
3177 /* journal checksum v1 */
3178 compat = JBD2_FEATURE_COMPAT_CHECKSUM;
3179 incompat = 0;
3180 }
3181
3182 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
3183 ret = jbd2_journal_set_features(sbi->s_journal,
3184 compat, 0,
3185 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT |
3186 incompat);
3187 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
3188 ret = jbd2_journal_set_features(sbi->s_journal,
3189 compat, 0,
3190 incompat);
3191 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
3192 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
3193 } else {
3194 jbd2_journal_clear_features(sbi->s_journal,
3195 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
3196 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT |
3197 JBD2_FEATURE_INCOMPAT_CSUM_V2);
3198 }
3199
3200 return ret;
3201}
3202
952fc18e
TT		 3203/*
3204 * Note: calculating the overhead so we can be compatible with
3205 * historical BSD practice is quite difficult in the face of
3206 * clusters/bigalloc. This is because multiple metadata blocks from
3207 * different block group can end up in the same allocation cluster.
3208 * Calculating the exact overhead in the face of clustered allocation
3209 * requires either O(all block bitmaps) in memory or O(number of block
3210 * groups**2) in time. We will still calculate the superblock for
3211 * older file systems --- and if we come across with a bigalloc file
3212 * system with zero in s_overhead_clusters the estimate will be close to
3213 * correct especially for very large cluster sizes --- but for newer
3214 * file systems, it's better to calculate this figure once at mkfs
3215 * time, and store it in the superblock. If the superblock value is
3216 * present (even for non-bigalloc file systems), we will use it.
3217 */
3218static int count_overhead(struct super_block *sb, ext4_group_t grp,
3219 char *buf)
3220{
3221 struct ext4_sb_info *sbi = EXT4_SB(sb);
3222 struct ext4_group_desc *gdp;
3223 ext4_fsblk_t first_block, last_block, b;
3224 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3225 int s, j, count = 0;
3226
0548bbb8
TT		 3227 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_BIGALLOC))
3228 return (ext4_bg_has_super(sb, grp) + ext4_bg_num_gdb(sb, grp) +
3229 sbi->s_itb_per_group + 2);
3230
952fc18e
TT		 3231 first_block = le32_to_cpu(sbi->s_es->s_first_data_block) +
3232 (grp * EXT4_BLOCKS_PER_GROUP(sb));
3233 last_block = first_block + EXT4_BLOCKS_PER_GROUP(sb) - 1;
3234 for (i = 0; i < ngroups; i++) {
3235 gdp = ext4_get_group_desc(sb, i, NULL);
3236 b = ext4_block_bitmap(sb, gdp);
3237 if (b >= first_block && b <= last_block) {
3238 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3239 count++;
3240 }
3241 b = ext4_inode_bitmap(sb, gdp);
3242 if (b >= first_block && b <= last_block) {
3243 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3244 count++;
3245 }
3246 b = ext4_inode_table(sb, gdp);
3247 if (b >= first_block && b + sbi->s_itb_per_group <= last_block)
3248 for (j = 0; j < sbi->s_itb_per_group; j++, b++) {
3249 int c = EXT4_B2C(sbi, b - first_block);
3250 ext4_set_bit(c, buf);
3251 count++;
3252 }
3253 if (i != grp)
3254 continue;
3255 s = 0;
3256 if (ext4_bg_has_super(sb, grp)) {
3257 ext4_set_bit(s++, buf);
3258 count++;
3259 }
3260 for (j = ext4_bg_num_gdb(sb, grp); j > 0; j--) {
3261 ext4_set_bit(EXT4_B2C(sbi, s++), buf);
3262 count++;
3263 }
3264 }
3265 if (!count)
3266 return 0;
3267 return EXT4_CLUSTERS_PER_GROUP(sb) -
3268 ext4_count_free(buf, EXT4_CLUSTERS_PER_GROUP(sb) / 8);
3269}
3270
3271/*
3272 * Compute the overhead and stash it in sbi->s_overhead
3273 */
3274int ext4_calculate_overhead(struct super_block *sb)
3275{
3276 struct ext4_sb_info *sbi = EXT4_SB(sb);
3277 struct ext4_super_block *es = sbi->s_es;
3278 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3279 ext4_fsblk_t overhead = 0;
3280 char *buf = (char *) get_zeroed_page(GFP_KERNEL);
3281
952fc18e
TT		 3282 if (!buf)
3283 return -ENOMEM;
3284
3285 /*
3286 * Compute the overhead (FS structures). This is constant
3287 * for a given filesystem unless the number of block groups
3288 * changes so we cache the previous value until it does.
3289 */
3290
3291 /*
3292 * All of the blocks before first_data_block are overhead
3293 */
3294 overhead = EXT4_B2C(sbi, le32_to_cpu(es->s_first_data_block));
3295
3296 /*
3297 * Add the overhead found in each block group
3298 */
3299 for (i = 0; i < ngroups; i++) {
3300 int blks;
3301
3302 blks = count_overhead(sb, i, buf);
3303 overhead += blks;
3304 if (blks)
3305 memset(buf, 0, PAGE_SIZE);
3306 cond_resched();
3307 }
0875a2b4
ES		 3308 /* Add the journal blocks as well */
3309 if (sbi->s_journal)
810da240 3310 overhead += EXT4_NUM_B2C(sbi, sbi->s_journal->j_maxlen);
0875a2b4 3311
952fc18e
TT		 3312 sbi->s_overhead = overhead;
3313 smp_wmb();
3314 free_page((unsigned long) buf);
3315 return 0;
3316}
3317
27dd4385 3318
30fac0f7 3319static ext4_fsblk_t ext4_calculate_resv_clusters(struct super_block *sb)
27dd4385
LC		 3320{
3321 ext4_fsblk_t resv_clusters;
3322
30fac0f7
JK		 3323 /*
3324 * There's no need to reserve anything when we aren't using extents.
3325 * The space estimates are exact, there are no unwritten extents,
3326 * hole punching doesn't need new metadata... This is needed especially
3327 * to keep ext2/3 backward compatibility.
3328 */
3329 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS))
3330 return 0;
27dd4385
LC		 3331 /*
3332 * By default we reserve 2% or 4096 clusters, whichever is smaller.
3333 * This should cover the situations where we can not afford to run
3334 * out of space like for example punch hole, or converting
3335 * uninitialized extents in delalloc path. In most cases such
3336 * allocation would require 1, or 2 blocks, higher numbers are
3337 * very rare.
3338 */
30fac0f7
JK		 3339 resv_clusters = ext4_blocks_count(EXT4_SB(sb)->s_es) >>
3340 EXT4_SB(sb)->s_cluster_bits;
27dd4385
LC		 3341
3342 do_div(resv_clusters, 50);
3343 resv_clusters = min_t(ext4_fsblk_t, resv_clusters, 4096);
3344
3345 return resv_clusters;
3346}
3347
3348
3349static int ext4_reserve_clusters(struct ext4_sb_info *sbi, ext4_fsblk_t count)
3350{
3351 ext4_fsblk_t clusters = ext4_blocks_count(sbi->s_es) >>
3352 sbi->s_cluster_bits;
3353
3354 if (count >= clusters)
3355 return -EINVAL;
3356
3357 atomic64_set(&sbi->s_resv_clusters, count);
3358 return 0;
3359}
3360
2b2d6d01 3361static int ext4_fill_super(struct super_block *sb, void *data, int silent)
ac27a0ec 3362{
d4c402d9 3363 char *orig_data = kstrdup(data, GFP_KERNEL);
2b2d6d01 3364 struct buffer_head *bh;
617ba13b
MC		 3365 struct ext4_super_block *es = NULL;
3366 struct ext4_sb_info *sbi;
3367 ext4_fsblk_t block;
3368 ext4_fsblk_t sb_block = get_sb_block(&data);
70bbb3e0 3369 ext4_fsblk_t logical_sb_block;
ac27a0ec 3370 unsigned long offset = 0;
ac27a0ec
DK		 3371 unsigned long journal_devnum = 0;
3372 unsigned long def_mount_opts;
3373 struct inode *root;
9f6200bb 3374 char *cp;
0390131b 3375 const char *descr;
dcc7dae3 3376 int ret = -ENOMEM;
281b5995 3377 int blocksize, clustersize;
4ec11028
TT		 3378 unsigned int db_count;
3379 unsigned int i;
281b5995 3380 int needs_recovery, has_huge_files, has_bigalloc;
bd81d8ee 3381 __u64 blocks_count;
07aa2ea1 3382 int err = 0;
b3881f74 3383 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
bfff6873 3384 ext4_group_t first_not_zeroed;
ac27a0ec
DK		 3385
3386 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
3387 if (!sbi)
dcc7dae3 3388 goto out_free_orig;
705895b6
PE		 3389
3390 sbi->s_blockgroup_lock =
3391 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
3392 if (!sbi->s_blockgroup_lock) {
3393 kfree(sbi);
dcc7dae3 3394 goto out_free_orig;
705895b6 3395 }
ac27a0ec 3396 sb->s_fs_info = sbi;
2c0544b2 3397 sbi->s_sb = sb;
240799cd 3398 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
d9c9bef1 3399 sbi->s_sb_block = sb_block;
f613dfcb
TT		 3400 if (sb->s_bdev->bd_part)
3401 sbi->s_sectors_written_start =
3402 part_stat_read(sb->s_bdev->bd_part, sectors[1]);
ac27a0ec 3403
9f6200bb
TT		 3404 /* Cleanup superblock name */
3405 for (cp = sb->s_id; (cp = strchr(cp, '/'));)
3406 *cp = '!';
3407
07aa2ea1 3408 /* -EINVAL is default */
dcc7dae3 3409 ret = -EINVAL;
617ba13b 3410 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
ac27a0ec 3411 if (!blocksize) {
b31e1552 3412 ext4_msg(sb, KERN_ERR, "unable to set blocksize");
ac27a0ec
DK		 3413 goto out_fail;
3414 }
3415
3416 /*
617ba13b 3417 * The ext4 superblock will not be buffer aligned for other than 1kB
ac27a0ec
DK		 3418 * block sizes. We need to calculate the offset from buffer start.
3419 */
617ba13b 3420 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
70bbb3e0
AM		 3421 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3422 offset = do_div(logical_sb_block, blocksize);
ac27a0ec 3423 } else {
70bbb3e0 3424 logical_sb_block = sb_block;
ac27a0ec
DK		 3425 }
3426
70bbb3e0 3427 if (!(bh = sb_bread(sb, logical_sb_block))) {
b31e1552 3428 ext4_msg(sb, KERN_ERR, "unable to read superblock");
ac27a0ec
DK		 3429 goto out_fail;
3430 }
3431 /*
3432 * Note: s_es must be initialized as soon as possible because
617ba13b 3433 * some ext4 macro-instructions depend on its value
ac27a0ec 3434 */
2716b802 3435 es = (struct ext4_super_block *) (bh->b_data + offset);
ac27a0ec
DK		 3436 sbi->s_es = es;
3437 sb->s_magic = le16_to_cpu(es->s_magic);
617ba13b
MC		 3438 if (sb->s_magic != EXT4_SUPER_MAGIC)
3439 goto cantfind_ext4;
afc32f7e 3440 sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
ac27a0ec 3441
feb0ab32
DW		 3442 /* Warn if metadata_csum and gdt_csum are both set. */
3443 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3444 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) &&
3445 EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_GDT_CSUM))
3446 ext4_warning(sb, KERN_INFO "metadata_csum and uninit_bg are "
3447 "redundant flags; please run fsck.");
3448
d25425f8
DW		 3449 /* Check for a known checksum algorithm */
3450 if (!ext4_verify_csum_type(sb, es)) {
3451 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3452 "unknown checksum algorithm.");
3453 silent = 1;
3454 goto cantfind_ext4;
3455 }
3456
0441984a
DW		 3457 /* Load the checksum driver */
3458 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3459 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) {
3460 sbi->s_chksum_driver = crypto_alloc_shash("crc32c", 0, 0);
3461 if (IS_ERR(sbi->s_chksum_driver)) {
3462 ext4_msg(sb, KERN_ERR, "Cannot load crc32c driver.");
3463 ret = PTR_ERR(sbi->s_chksum_driver);
3464 sbi->s_chksum_driver = NULL;
3465 goto failed_mount;
3466 }
3467 }
3468
a9c47317
DW		 3469 /* Check superblock checksum */
3470 if (!ext4_superblock_csum_verify(sb, es)) {
3471 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3472 "invalid superblock checksum. Run e2fsck?");
3473 silent = 1;
3474 goto cantfind_ext4;
3475 }
3476
3477 /* Precompute checksum seed for all metadata */
3478 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3479 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
3480 sbi->s_csum_seed = ext4_chksum(sbi, ~0, es->s_uuid,
3481 sizeof(es->s_uuid));
3482
ac27a0ec
DK		 3483 /* Set defaults before we parse the mount options */
3484 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
fd8c37ec 3485 set_opt(sb, INIT_INODE_TABLE);
617ba13b 3486 if (def_mount_opts & EXT4_DEFM_DEBUG)
fd8c37ec 3487 set_opt(sb, DEBUG);
87f26807 3488 if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
fd8c37ec 3489 set_opt(sb, GRPID);
617ba13b 3490 if (def_mount_opts & EXT4_DEFM_UID16)
fd8c37ec 3491 set_opt(sb, NO_UID32);
ea663336 3492 /* xattr user namespace & acls are now defaulted on */
ea663336 3493 set_opt(sb, XATTR_USER);
03010a33 3494#ifdef CONFIG_EXT4_FS_POSIX_ACL
ea663336 3495 set_opt(sb, POSIX_ACL);
2e7842b8 3496#endif
617ba13b 3497 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
fd8c37ec 3498 set_opt(sb, JOURNAL_DATA);
617ba13b 3499 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
fd8c37ec 3500 set_opt(sb, ORDERED_DATA);
617ba13b 3501 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
fd8c37ec 3502 set_opt(sb, WRITEBACK_DATA);
617ba13b
MC		 3503
3504 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
fd8c37ec 3505 set_opt(sb, ERRORS_PANIC);
bb4f397a 3506 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
fd8c37ec 3507 set_opt(sb, ERRORS_CONT);
bb4f397a 3508 else
fd8c37ec 3509 set_opt(sb, ERRORS_RO);
8b67f04a 3510 if (def_mount_opts & EXT4_DEFM_BLOCK_VALIDITY)
fd8c37ec 3511 set_opt(sb, BLOCK_VALIDITY);
8b67f04a 3512 if (def_mount_opts & EXT4_DEFM_DISCARD)
fd8c37ec 3513 set_opt(sb, DISCARD);
ac27a0ec 3514
08cefc7a
EB		 3515 sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));
3516 sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid));
30773840
TT		 3517 sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
3518 sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
3519 sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
ac27a0ec 3520
8b67f04a 3521 if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0)
fd8c37ec 3522 set_opt(sb, BARRIER);
ac27a0ec 3523
dd919b98
AK		 3524 /*
3525 * enable delayed allocation by default
3526 * Use -o nodelalloc to turn it off
3527 */
bc0b75f7 3528 if (!IS_EXT3_SB(sb) && !IS_EXT2_SB(sb) &&
8b67f04a 3529 ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0))
fd8c37ec 3530 set_opt(sb, DELALLOC);
dd919b98 3531
51ce6511
LC		 3532 /*
3533 * set default s_li_wait_mult for lazyinit, for the case there is
3534 * no mount option specified.
3535 */
3536 sbi->s_li_wait_mult = EXT4_DEF_LI_WAIT_MULT;
3537
8b67f04a 3538 if (!parse_options((char *) sbi->s_es->s_mount_opts, sb,
661aa520 3539 &journal_devnum, &journal_ioprio, 0)) {
8b67f04a
TT		 3540 ext4_msg(sb, KERN_WARNING,
3541 "failed to parse options in superblock: %s",
3542 sbi->s_es->s_mount_opts);
3543 }
5a916be1 3544 sbi->s_def_mount_opt = sbi->s_mount_opt;
b3881f74 3545 if (!parse_options((char *) data, sb, &journal_devnum,
661aa520 3546 &journal_ioprio, 0))
ac27a0ec
DK		 3547 goto failed_mount;
3548
56889787
TT		 3549 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
3550 printk_once(KERN_WARNING "EXT4-fs: Warning: mounting "
3551 "with data=journal disables delayed "
3552 "allocation and O_DIRECT support!\n");
3553 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
3554 ext4_msg(sb, KERN_ERR, "can't mount with "
3555 "both data=journal and delalloc");
3556 goto failed_mount;
3557 }
3558 if (test_opt(sb, DIOREAD_NOLOCK)) {
3559 ext4_msg(sb, KERN_ERR, "can't mount with "
6ae6514b 3560 "both data=journal and dioread_nolock");
56889787
TT		 3561 goto failed_mount;
3562 }
3563 if (test_opt(sb, DELALLOC))
3564 clear_opt(sb, DELALLOC);
3565 }
3566
ac27a0ec 3567 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
482a7425 3568 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec 3569
617ba13b
MC		 3570 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
3571 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
3572 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
3573 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
b31e1552
ES		 3574 ext4_msg(sb, KERN_WARNING,
3575 "feature flags set on rev 0 fs, "
3576 "running e2fsck is recommended");
469108ff 3577
2035e776
TT		 3578 if (IS_EXT2_SB(sb)) {
3579 if (ext2_feature_set_ok(sb))
3580 ext4_msg(sb, KERN_INFO, "mounting ext2 file system "
3581 "using the ext4 subsystem");
3582 else {
3583 ext4_msg(sb, KERN_ERR, "couldn't mount as ext2 due "
3584 "to feature incompatibilities");
3585 goto failed_mount;
3586 }
3587 }
3588
3589 if (IS_EXT3_SB(sb)) {
3590 if (ext3_feature_set_ok(sb))
3591 ext4_msg(sb, KERN_INFO, "mounting ext3 file system "
3592 "using the ext4 subsystem");
3593 else {
3594 ext4_msg(sb, KERN_ERR, "couldn't mount as ext3 due "
3595 "to feature incompatibilities");
3596 goto failed_mount;
3597 }
3598 }
3599
ac27a0ec
DK		 3600 /*
3601 * Check feature flags regardless of the revision level, since we
3602 * previously didn't change the revision level when setting the flags,
3603 * so there is a chance incompat flags are set on a rev 0 filesystem.
3604 */
a13fb1a4 3605 if (!ext4_feature_set_ok(sb, (sb->s_flags & MS_RDONLY)))
ac27a0ec 3606 goto failed_mount;
a13fb1a4 3607
261cb20c 3608 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
617ba13b
MC		 3609 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
3610 blocksize > EXT4_MAX_BLOCK_SIZE) {
b31e1552
ES		 3611 ext4_msg(sb, KERN_ERR,
3612 "Unsupported filesystem blocksize %d", blocksize);
ac27a0ec
DK		 3613 goto failed_mount;
3614 }
3615
ac27a0ec 3616 if (sb->s_blocksize != blocksize) {
ce40733c
AK		 3617 /* Validate the filesystem blocksize */
3618 if (!sb_set_blocksize(sb, blocksize)) {
b31e1552 3619 ext4_msg(sb, KERN_ERR, "bad block size %d",
ce40733c 3620 blocksize);
ac27a0ec
DK		 3621 goto failed_mount;
3622 }
3623
2b2d6d01 3624 brelse(bh);
70bbb3e0
AM		 3625 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3626 offset = do_div(logical_sb_block, blocksize);
3627 bh = sb_bread(sb, logical_sb_block);
ac27a0ec 3628 if (!bh) {
b31e1552
ES		 3629 ext4_msg(sb, KERN_ERR,
3630 "Can't read superblock on 2nd try");
ac27a0ec
DK		 3631 goto failed_mount;
3632 }
2716b802 3633 es = (struct ext4_super_block *)(bh->b_data + offset);
ac27a0ec 3634 sbi->s_es = es;
617ba13b 3635 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
b31e1552
ES		 3636 ext4_msg(sb, KERN_ERR,
3637 "Magic mismatch, very weird!");
ac27a0ec
DK		 3638 goto failed_mount;
3639 }
3640 }
3641
a13fb1a4
ES		 3642 has_huge_files = EXT4_HAS_RO_COMPAT_FEATURE(sb,
3643 EXT4_FEATURE_RO_COMPAT_HUGE_FILE);
f287a1a5
TT		 3644 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
3645 has_huge_files);
3646 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
ac27a0ec 3647
617ba13b
MC		 3648 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
3649 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
3650 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
ac27a0ec
DK		 3651 } else {
3652 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
3653 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
617ba13b 3654 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
1330593e 3655 (!is_power_of_2(sbi->s_inode_size)) ||
ac27a0ec 3656 (sbi->s_inode_size > blocksize)) {
b31e1552
ES		 3657 ext4_msg(sb, KERN_ERR,
3658 "unsupported inode size: %d",
2b2d6d01 3659 sbi->s_inode_size);
ac27a0ec
DK		 3660 goto failed_mount;
3661 }
ef7f3835
KS		 3662 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
3663 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
ac27a0ec 3664 }
0b8e58a1 3665
0d1ee42f
AR		 3666 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
3667 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
8fadc143 3668 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
0d1ee42f 3669 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
d8ea6cf8 3670 !is_power_of_2(sbi->s_desc_size)) {
b31e1552
ES		 3671 ext4_msg(sb, KERN_ERR,
3672 "unsupported descriptor size %lu",
0d1ee42f
AR		 3673 sbi->s_desc_size);
3674 goto failed_mount;
3675 }
3676 } else
3677 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
0b8e58a1 3678
ac27a0ec 3679 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
ac27a0ec 3680 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
b47b6f38 3681 if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
617ba13b 3682 goto cantfind_ext4;
0b8e58a1 3683
617ba13b 3684 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
ac27a0ec 3685 if (sbi->s_inodes_per_block == 0)
617ba13b 3686 goto cantfind_ext4;
ac27a0ec
DK		 3687 sbi->s_itb_per_group = sbi->s_inodes_per_group /
3688 sbi->s_inodes_per_block;
0d1ee42f 3689 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
ac27a0ec
DK		 3690 sbi->s_sbh = bh;
3691 sbi->s_mount_state = le16_to_cpu(es->s_state);
e57aa839
FW		 3692 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
3693 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
0b8e58a1 3694
2b2d6d01 3695 for (i = 0; i < 4; i++)
ac27a0ec
DK		 3696 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
3697 sbi->s_def_hash_version = es->s_def_hash_version;
23301410
TT		 3698 if (EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_DIR_INDEX)) {
3699 i = le32_to_cpu(es->s_flags);
3700 if (i & EXT2_FLAGS_UNSIGNED_HASH)
3701 sbi->s_hash_unsigned = 3;
3702 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
f99b2589 3703#ifdef __CHAR_UNSIGNED__
23301410
TT		 3704 if (!(sb->s_flags & MS_RDONLY))
3705 es->s_flags |=
3706 cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
3707 sbi->s_hash_unsigned = 3;
f99b2589 3708#else
23301410
TT		 3709 if (!(sb->s_flags & MS_RDONLY))
3710 es->s_flags |=
3711 cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
f99b2589 3712#endif
23301410 3713 }
f99b2589 3714 }
ac27a0ec 3715
281b5995
TT		 3716 /* Handle clustersize */
3717 clustersize = BLOCK_SIZE << le32_to_cpu(es->s_log_cluster_size);
3718 has_bigalloc = EXT4_HAS_RO_COMPAT_FEATURE(sb,
3719 EXT4_FEATURE_RO_COMPAT_BIGALLOC);
3720 if (has_bigalloc) {
3721 if (clustersize < blocksize) {
3722 ext4_msg(sb, KERN_ERR,
3723 "cluster size (%d) smaller than "
3724 "block size (%d)", clustersize, blocksize);
3725 goto failed_mount;
3726 }
3727 sbi->s_cluster_bits = le32_to_cpu(es->s_log_cluster_size) -
3728 le32_to_cpu(es->s_log_block_size);
3729 sbi->s_clusters_per_group =
3730 le32_to_cpu(es->s_clusters_per_group);
3731 if (sbi->s_clusters_per_group > blocksize * 8) {
3732 ext4_msg(sb, KERN_ERR,
3733 "#clusters per group too big: %lu",
3734 sbi->s_clusters_per_group);
3735 goto failed_mount;
3736 }
3737 if (sbi->s_blocks_per_group !=
3738 (sbi->s_clusters_per_group * (clustersize / blocksize))) {
3739 ext4_msg(sb, KERN_ERR, "blocks per group (%lu) and "
3740 "clusters per group (%lu) inconsistent",
3741 sbi->s_blocks_per_group,
3742 sbi->s_clusters_per_group);
3743 goto failed_mount;
3744 }
3745 } else {
3746 if (clustersize != blocksize) {
3747 ext4_warning(sb, "fragment/cluster size (%d) != "
3748 "block size (%d)", clustersize,
3749 blocksize);
3750 clustersize = blocksize;
3751 }
3752 if (sbi->s_blocks_per_group > blocksize * 8) {
3753 ext4_msg(sb, KERN_ERR,
3754 "#blocks per group too big: %lu",
3755 sbi->s_blocks_per_group);
3756 goto failed_mount;
3757 }
3758 sbi->s_clusters_per_group = sbi->s_blocks_per_group;
3759 sbi->s_cluster_bits = 0;
ac27a0ec 3760 }
281b5995
TT		 3761 sbi->s_cluster_ratio = clustersize / blocksize;
3762
ac27a0ec 3763 if (sbi->s_inodes_per_group > blocksize * 8) {
b31e1552
ES		 3764 ext4_msg(sb, KERN_ERR,
3765 "#inodes per group too big: %lu",
2b2d6d01 3766 sbi->s_inodes_per_group);
ac27a0ec
DK		 3767 goto failed_mount;
3768 }
3769
960fd856
TT		 3770 /* Do we have standard group size of clustersize * 8 blocks ? */
3771 if (sbi->s_blocks_per_group == clustersize << 3)
3772 set_opt2(sb, STD_GROUP_SIZE);
3773
bf43d84b
ES		 3774 /*
3775 * Test whether we have more sectors than will fit in sector_t,
3776 * and whether the max offset is addressable by the page cache.
3777 */
5a9ae68a 3778 err = generic_check_addressable(sb->s_blocksize_bits,
30ca22c7 3779 ext4_blocks_count(es));
5a9ae68a 3780 if (err) {
b31e1552 3781 ext4_msg(sb, KERN_ERR, "filesystem"
bf43d84b 3782 " too large to mount safely on this system");
ac27a0ec 3783 if (sizeof(sector_t) < 8)
90c699a9 3784 ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled");
ac27a0ec
DK		 3785 goto failed_mount;
3786 }
3787
617ba13b
MC		 3788 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
3789 goto cantfind_ext4;
e7c95593 3790
0f2ddca6
FTN		 3791 /* check blocks count against device size */
3792 blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
3793 if (blocks_count && ext4_blocks_count(es) > blocks_count) {
b31e1552
ES		 3794 ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
3795 "exceeds size of device (%llu blocks)",
0f2ddca6
FTN		 3796 ext4_blocks_count(es), blocks_count);
3797 goto failed_mount;
3798 }
3799
0b8e58a1
AD		 3800 /*
3801 * It makes no sense for the first data block to be beyond the end
3802 * of the filesystem.
3803 */
3804 if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
5635a62b 3805 ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
b31e1552
ES		 3806 "block %u is beyond end of filesystem (%llu)",
3807 le32_to_cpu(es->s_first_data_block),
3808 ext4_blocks_count(es));
e7c95593
ES		 3809 goto failed_mount;
3810 }
bd81d8ee
LV		 3811 blocks_count = (ext4_blocks_count(es) -
3812 le32_to_cpu(es->s_first_data_block) +
3813 EXT4_BLOCKS_PER_GROUP(sb) - 1);
3814 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
4ec11028 3815 if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
b31e1552 3816 ext4_msg(sb, KERN_WARNING, "groups count too large: %u "
4ec11028 3817 "(block count %llu, first data block %u, "
b31e1552 3818 "blocks per group %lu)", sbi->s_groups_count,
4ec11028
TT		 3819 ext4_blocks_count(es),
3820 le32_to_cpu(es->s_first_data_block),
3821 EXT4_BLOCKS_PER_GROUP(sb));
3822 goto failed_mount;
3823 }
bd81d8ee 3824 sbi->s_groups_count = blocks_count;
fb0a387d
ES		 3825 sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
3826 (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
617ba13b
MC		 3827 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
3828 EXT4_DESC_PER_BLOCK(sb);
f18a5f21
TT		 3829 sbi->s_group_desc = ext4_kvmalloc(db_count *
3830 sizeof(struct buffer_head *),
3831 GFP_KERNEL);
ac27a0ec 3832 if (sbi->s_group_desc == NULL) {
b31e1552 3833 ext4_msg(sb, KERN_ERR, "not enough memory");
2cde417d 3834 ret = -ENOMEM;
ac27a0ec
DK		 3835 goto failed_mount;
3836 }
3837
9f6200bb
TT		 3838 if (ext4_proc_root)
3839 sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);
240799cd 3840
66acdcf4
TT		 3841 if (sbi->s_proc)
3842 proc_create_data("options", S_IRUGO, sbi->s_proc,
3843 &ext4_seq_options_fops, sb);
3844
705895b6 3845 bgl_lock_init(sbi->s_blockgroup_lock);
ac27a0ec
DK		 3846
3847 for (i = 0; i < db_count; i++) {
70bbb3e0 3848 block = descriptor_loc(sb, logical_sb_block, i);
ac27a0ec
DK		 3849 sbi->s_group_desc[i] = sb_bread(sb, block);
3850 if (!sbi->s_group_desc[i]) {
b31e1552
ES		 3851 ext4_msg(sb, KERN_ERR,
3852 "can't read group descriptor %d", i);
ac27a0ec
DK		 3853 db_count = i;
3854 goto failed_mount2;
3855 }
3856 }
bfff6873 3857 if (!ext4_check_descriptors(sb, &first_not_zeroed)) {
b31e1552 3858 ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
ac27a0ec
DK		 3859 goto failed_mount2;
3860 }
772cb7c8
JS		 3861 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
3862 if (!ext4_fill_flex_info(sb)) {
b31e1552
ES		 3863 ext4_msg(sb, KERN_ERR,
3864 "unable to initialize "
3865 "flex_bg meta info!");
772cb7c8
JS		 3866 goto failed_mount2;
3867 }
3868
ac27a0ec
DK		 3869 sbi->s_gdb_count = db_count;
3870 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
3871 spin_lock_init(&sbi->s_next_gen_lock);
3872
04496411
TM		 3873 init_timer(&sbi->s_err_report);
3874 sbi->s_err_report.function = print_daily_error_info;
3875 sbi->s_err_report.data = (unsigned long) sb;
3876
a75ae78f 3877 /* Register extent status tree shrinker */
d3922a77 3878 ext4_es_register_shrinker(sbi);
a75ae78f 3879
57042651 3880 err = percpu_counter_init(&sbi->s_freeclusters_counter,
5dee5437 3881 ext4_count_free_clusters(sb));
ce7e010a
TT		 3882 if (!err) {
3883 err = percpu_counter_init(&sbi->s_freeinodes_counter,
3884 ext4_count_free_inodes(sb));
3885 }
3886 if (!err) {
3887 err = percpu_counter_init(&sbi->s_dirs_counter,
3888 ext4_count_dirs(sb));
3889 }
3890 if (!err) {
57042651 3891 err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0);
ce7e010a 3892 }
1ac6466f
TT		 3893 if (!err) {
3894 err = percpu_counter_init(&sbi->s_extent_cache_cnt, 0);
3895 }
ce7e010a
TT		 3896 if (err) {
3897 ext4_msg(sb, KERN_ERR, "insufficient memory");
3898 goto failed_mount3;
3899 }
3900
c9de560d 3901 sbi->s_stripe = ext4_get_stripe_size(sbi);
67a5da56 3902 sbi->s_extent_max_zeroout_kb = 32;
c9de560d 3903
ac27a0ec
DK		 3904 /*
3905 * set up enough so that it can read an inode
3906 */
9ca92389
TT		 3907 if (!test_opt(sb, NOLOAD) &&
3908 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
3909 sb->s_op = &ext4_sops;
3910 else
3911 sb->s_op = &ext4_nojournal_sops;
617ba13b
MC		 3912 sb->s_export_op = &ext4_export_ops;
3913 sb->s_xattr = ext4_xattr_handlers;
ac27a0ec 3914#ifdef CONFIG_QUOTA
617ba13b 3915 sb->dq_op = &ext4_quota_operations;
262b4662 3916 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA))
7c319d32 3917 sb->s_qcop = &ext4_qctl_sysfile_operations;
262b4662
JK		 3918 else
3919 sb->s_qcop = &ext4_qctl_operations;
ac27a0ec 3920#endif
f2fa2ffc
AK		 3921 memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
3922
ac27a0ec 3923 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
3b9d4ed2 3924 mutex_init(&sbi->s_orphan_lock);
ac27a0ec
DK		 3925
3926 sb->s_root = NULL;
3927
3928 needs_recovery = (es->s_last_orphan != 0 ||
617ba13b
MC		 3929 EXT4_HAS_INCOMPAT_FEATURE(sb,
3930 EXT4_FEATURE_INCOMPAT_RECOVER));
ac27a0ec 3931
c5e06d10
JL		 3932 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_MMP) &&
3933 !(sb->s_flags & MS_RDONLY))
3934 if (ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block)))
3935 goto failed_mount3;
3936
ac27a0ec
DK		 3937 /*
3938 * The first inode we look at is the journal inode. Don't try
3939 * root first: it may be modified in the journal!
3940 */
3941 if (!test_opt(sb, NOLOAD) &&
617ba13b
MC		 3942 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
3943 if (ext4_load_journal(sb, es, journal_devnum))
ac27a0ec 3944 goto failed_mount3;
0390131b
FM		 3945 } else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) &&
3946 EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
b31e1552
ES		 3947 ext4_msg(sb, KERN_ERR, "required journal recovery "
3948 "suppressed and not mounted read-only");
744692dc 3949 goto failed_mount_wq;
ac27a0ec 3950 } else {
fd8c37ec 3951 clear_opt(sb, DATA_FLAGS);
0390131b
FM		 3952 sbi->s_journal = NULL;
3953 needs_recovery = 0;
3954 goto no_journal;
ac27a0ec
DK		 3955 }
3956
f32aaf2d 3957 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT) &&
eb40a09c
JS		 3958 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
3959 JBD2_FEATURE_INCOMPAT_64BIT)) {
b31e1552 3960 ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
744692dc 3961 goto failed_mount_wq;
eb40a09c
JS		 3962 }
3963
25ed6e8a
DW		 3964 if (!set_journal_csum_feature_set(sb)) {
3965 ext4_msg(sb, KERN_ERR, "Failed to set journal checksum "
3966 "feature set");
3967 goto failed_mount_wq;
d4da6c9c 3968 }
818d276c 3969
ac27a0ec
DK		 3970 /* We have now updated the journal if required, so we can
3971 * validate the data journaling mode. */
3972 switch (test_opt(sb, DATA_FLAGS)) {
3973 case 0:
3974 /* No mode set, assume a default based on the journal
63f57933
AM		 3975 * capabilities: ORDERED_DATA if the journal can
3976 * cope, else JOURNAL_DATA
3977 */
dab291af
MC		 3978 if (jbd2_journal_check_available_features
3979 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
fd8c37ec 3980 set_opt(sb, ORDERED_DATA);
ac27a0ec 3981 else
fd8c37ec 3982 set_opt(sb, JOURNAL_DATA);
ac27a0ec
DK		 3983 break;
3984
617ba13b
MC		 3985 case EXT4_MOUNT_ORDERED_DATA:
3986 case EXT4_MOUNT_WRITEBACK_DATA:
dab291af
MC		 3987 if (!jbd2_journal_check_available_features
3988 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
b31e1552
ES		 3989 ext4_msg(sb, KERN_ERR, "Journal does not support "
3990 "requested data journaling mode");
744692dc 3991 goto failed_mount_wq;
ac27a0ec
DK		 3992 }
3993 default:
3994 break;
3995 }
b3881f74 3996 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
ac27a0ec 3997
18aadd47
BJ		 3998 sbi->s_journal->j_commit_callback = ext4_journal_commit_callback;
3999
ce7e010a
TT		 4000 /*
4001 * The journal may have updated the bg summary counts, so we
4002 * need to update the global counters.
4003 */
57042651 4004 percpu_counter_set(&sbi->s_freeclusters_counter,
5dee5437 4005 ext4_count_free_clusters(sb));
ce7e010a
TT		 4006 percpu_counter_set(&sbi->s_freeinodes_counter,
4007 ext4_count_free_inodes(sb));
4008 percpu_counter_set(&sbi->s_dirs_counter,
4009 ext4_count_dirs(sb));
57042651 4010 percpu_counter_set(&sbi->s_dirtyclusters_counter, 0);
206f7ab4 4011
ce7e010a 4012no_journal:
952fc18e
TT		 4013 /*
4014 * Get the # of file system overhead blocks from the
4015 * superblock if present.
4016 */
4017 if (es->s_overhead_clusters)
4018 sbi->s_overhead = le32_to_cpu(es->s_overhead_clusters);
4019 else {
07aa2ea1
LC		 4020 err = ext4_calculate_overhead(sb);
4021 if (err)
952fc18e
TT		 4022 goto failed_mount_wq;
4023 }
4024
fd89d5f2
TH		 4025 /*
4026 * The maximum number of concurrent works can be high and
4027 * concurrency isn't really necessary. Limit it to 1.
4028 */
2e8fa54e
JK		 4029 EXT4_SB(sb)->rsv_conversion_wq =
4030 alloc_workqueue("ext4-rsv-conversion", WQ_MEM_RECLAIM | WQ_UNBOUND, 1);
4031 if (!EXT4_SB(sb)->rsv_conversion_wq) {
4032 printk(KERN_ERR "EXT4-fs: failed to create workqueue\n");
07aa2ea1 4033 ret = -ENOMEM;
2e8fa54e
JK		 4034 goto failed_mount4;
4035 }
4036
ac27a0ec 4037 /*
dab291af 4038 * The jbd2_journal_load will have done any necessary log recovery,
ac27a0ec
DK		 4039 * so we can safely mount the rest of the filesystem now.
4040 */
4041
1d1fe1ee
DH		 4042 root = ext4_iget(sb, EXT4_ROOT_INO);
4043 if (IS_ERR(root)) {
b31e1552 4044 ext4_msg(sb, KERN_ERR, "get root inode failed");
1d1fe1ee 4045 ret = PTR_ERR(root);
32a9bb57 4046 root = NULL;
ac27a0ec
DK		 4047 goto failed_mount4;
4048 }
4049 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
b31e1552 4050 ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
94bf608a 4051 iput(root);
ac27a0ec
DK		 4052 goto failed_mount4;
4053 }
48fde701 4054 sb->s_root = d_make_root(root);
1d1fe1ee 4055 if (!sb->s_root) {
b31e1552 4056 ext4_msg(sb, KERN_ERR, "get root dentry failed");
1d1fe1ee
DH		 4057 ret = -ENOMEM;
4058 goto failed_mount4;
4059 }
ac27a0ec 4060
7e84b621
ES		 4061 if (ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY))
4062 sb->s_flags |= MS_RDONLY;
ef7f3835
KS		 4063
4064 /* determine the minimum size of new large inodes, if present */
4065 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
4066 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
4067 EXT4_GOOD_OLD_INODE_SIZE;
4068 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
4069 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) {
4070 if (sbi->s_want_extra_isize <
4071 le16_to_cpu(es->s_want_extra_isize))
4072 sbi->s_want_extra_isize =
4073 le16_to_cpu(es->s_want_extra_isize);
4074 if (sbi->s_want_extra_isize <
4075 le16_to_cpu(es->s_min_extra_isize))
4076 sbi->s_want_extra_isize =
4077 le16_to_cpu(es->s_min_extra_isize);
4078 }
4079 }
4080 /* Check if enough inode space is available */
4081 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
4082 sbi->s_inode_size) {
4083 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
4084 EXT4_GOOD_OLD_INODE_SIZE;
b31e1552
ES		 4085 ext4_msg(sb, KERN_INFO, "required extra inode space not"
4086 "available");
ef7f3835
KS		 4087 }
4088
30fac0f7 4089 err = ext4_reserve_clusters(sbi, ext4_calculate_resv_clusters(sb));
27dd4385
LC		 4090 if (err) {
4091 ext4_msg(sb, KERN_ERR, "failed to reserve %llu clusters for "
30fac0f7 4092 "reserved pool", ext4_calculate_resv_clusters(sb));
27dd4385
LC		 4093 goto failed_mount4a;
4094 }
4095
6fd058f7
TT		 4096 err = ext4_setup_system_zone(sb);
4097 if (err) {
b31e1552 4098 ext4_msg(sb, KERN_ERR, "failed to initialize system "
fbe845dd 4099 "zone (%d)", err);
94bf608a 4100 goto failed_mount4a;
6fd058f7
TT		 4101 }
4102
c2774d84 4103 ext4_ext_init(sb);
9d99012f 4104 err = ext4_mb_init(sb);
c2774d84 4105 if (err) {
421f91d2 4106 ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)",
b31e1552 4107 err);
dcf2d804 4108 goto failed_mount5;
c2774d84
AK		 4109 }
4110
bfff6873
LC		 4111 err = ext4_register_li_request(sb, first_not_zeroed);
4112 if (err)
dcf2d804 4113 goto failed_mount6;
bfff6873 4114
3197ebdb
TT		 4115 sbi->s_kobj.kset = ext4_kset;
4116 init_completion(&sbi->s_kobj_unregister);
4117 err = kobject_init_and_add(&sbi->s_kobj, &ext4_ktype, NULL,
4118 "%s", sb->s_id);
dcf2d804
TM		 4119 if (err)
4120 goto failed_mount7;
3197ebdb 4121
9b2ff357
JK		 4122#ifdef CONFIG_QUOTA
4123 /* Enable quota usage during mount. */
4124 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) &&
4125 !(sb->s_flags & MS_RDONLY)) {
4126 err = ext4_enable_quotas(sb);
4127 if (err)
4128 goto failed_mount8;
4129 }
4130#endif /* CONFIG_QUOTA */
4131
617ba13b
MC		 4132 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
4133 ext4_orphan_cleanup(sb, es);
4134 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
0390131b 4135 if (needs_recovery) {
b31e1552 4136 ext4_msg(sb, KERN_INFO, "recovery complete");
0390131b
FM		 4137 ext4_mark_recovery_complete(sb, es);
4138 }
4139 if (EXT4_SB(sb)->s_journal) {
4140 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
4141 descr = " journalled data mode";
4142 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
4143 descr = " ordered data mode";
4144 else
4145 descr = " writeback data mode";
4146 } else
4147 descr = "out journal";
4148
79add3a3
LC		 4149 if (test_opt(sb, DISCARD)) {
4150 struct request_queue *q = bdev_get_queue(sb->s_bdev);
4151 if (!blk_queue_discard(q))
4152 ext4_msg(sb, KERN_WARNING,
4153 "mounting with \"discard\" option, but "
4154 "the device does not support discard");
4155 }
4156
d4c402d9 4157 ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. "
8b67f04a
TT		 4158 "Opts: %s%s%s", descr, sbi->s_es->s_mount_opts,
4159 *sbi->s_es->s_mount_opts ? "; " : "", orig_data);
ac27a0ec 4160
66e61a9e
TT		 4161 if (es->s_error_count)
4162 mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */
ac27a0ec 4163
efbed4dc
TT		 4164 /* Enable message ratelimiting. Default is 10 messages per 5 secs. */
4165 ratelimit_state_init(&sbi->s_err_ratelimit_state, 5 * HZ, 10);
4166 ratelimit_state_init(&sbi->s_warning_ratelimit_state, 5 * HZ, 10);
4167 ratelimit_state_init(&sbi->s_msg_ratelimit_state, 5 * HZ, 10);
4168
d4c402d9 4169 kfree(orig_data);
ac27a0ec
DK		 4170 return 0;
4171
617ba13b 4172cantfind_ext4:
ac27a0ec 4173 if (!silent)
b31e1552 4174 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
ac27a0ec
DK		 4175 goto failed_mount;
4176
72ba7450
TT		 4177#ifdef CONFIG_QUOTA
4178failed_mount8:
4179 kobject_del(&sbi->s_kobj);
4180#endif
dcf2d804
TM		 4181failed_mount7:
4182 ext4_unregister_li_request(sb);
4183failed_mount6:
dcf2d804 4184 ext4_mb_release(sb);
94bf608a
AV		 4185failed_mount5:
4186 ext4_ext_release(sb);
dcf2d804 4187 ext4_release_system_zone(sb);
94bf608a
AV		 4188failed_mount4a:
4189 dput(sb->s_root);
32a9bb57 4190 sb->s_root = NULL;
94bf608a 4191failed_mount4:
b31e1552 4192 ext4_msg(sb, KERN_ERR, "mount failed");
2e8fa54e
JK		 4193 if (EXT4_SB(sb)->rsv_conversion_wq)
4194 destroy_workqueue(EXT4_SB(sb)->rsv_conversion_wq);
4c0425ff 4195failed_mount_wq:
0390131b
FM		 4196 if (sbi->s_journal) {
4197 jbd2_journal_destroy(sbi->s_journal);
4198 sbi->s_journal = NULL;
4199 }
ac27a0ec 4200failed_mount3:
d3922a77 4201 ext4_es_unregister_shrinker(sbi);
9105bb14 4202 del_timer_sync(&sbi->s_err_report);
9933fc0a
TT		 4203 if (sbi->s_flex_groups)
4204 ext4_kvfree(sbi->s_flex_groups);
57042651 4205 percpu_counter_destroy(&sbi->s_freeclusters_counter);
ce7e010a
TT		 4206 percpu_counter_destroy(&sbi->s_freeinodes_counter);
4207 percpu_counter_destroy(&sbi->s_dirs_counter);
57042651 4208 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
1ac6466f 4209 percpu_counter_destroy(&sbi->s_extent_cache_cnt);
c5e06d10
JL		 4210 if (sbi->s_mmp_tsk)
4211 kthread_stop(sbi->s_mmp_tsk);
ac27a0ec
DK		 4212failed_mount2:
4213 for (i = 0; i < db_count; i++)
4214 brelse(sbi->s_group_desc[i]);
f18a5f21 4215 ext4_kvfree(sbi->s_group_desc);
ac27a0ec 4216failed_mount:
0441984a
DW		 4217 if (sbi->s_chksum_driver)
4218 crypto_free_shash(sbi->s_chksum_driver);
240799cd 4219 if (sbi->s_proc) {
66acdcf4 4220 remove_proc_entry("options", sbi->s_proc);
9f6200bb 4221 remove_proc_entry(sb->s_id, ext4_proc_root);
240799cd 4222 }
ac27a0ec
DK		 4223#ifdef CONFIG_QUOTA
4224 for (i = 0; i < MAXQUOTAS; i++)
4225 kfree(sbi->s_qf_names[i]);
4226#endif
617ba13b 4227 ext4_blkdev_remove(sbi);
ac27a0ec
DK		 4228 brelse(bh);
4229out_fail:
4230 sb->s_fs_info = NULL;
f6830165 4231 kfree(sbi->s_blockgroup_lock);
ac27a0ec 4232 kfree(sbi);
dcc7dae3 4233out_free_orig:
d4c402d9 4234 kfree(orig_data);
07aa2ea1 4235 return err ? err : ret;
ac27a0ec
DK		 4236}
4237
4238/*
4239 * Setup any per-fs journal parameters now. We'll do this both on
4240 * initial mount, once the journal has been initialised but before we've
4241 * done any recovery; and again on any subsequent remount.
4242 */
617ba13b 4243static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
ac27a0ec 4244{
617ba13b 4245 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4246
30773840
TT		 4247 journal->j_commit_interval = sbi->s_commit_interval;
4248 journal->j_min_batch_time = sbi->s_min_batch_time;
4249 journal->j_max_batch_time = sbi->s_max_batch_time;
ac27a0ec 4250
a931da6a 4251 write_lock(&journal->j_state_lock);
ac27a0ec 4252 if (test_opt(sb, BARRIER))
dab291af 4253 journal->j_flags |= JBD2_BARRIER;
ac27a0ec 4254 else
dab291af 4255 journal->j_flags &= ~JBD2_BARRIER;
5bf5683a
HK		 4256 if (test_opt(sb, DATA_ERR_ABORT))
4257 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
4258 else
4259 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
a931da6a 4260 write_unlock(&journal->j_state_lock);
ac27a0ec
DK		 4261}
4262
617ba13b 4263static journal_t *ext4_get_journal(struct super_block *sb,
ac27a0ec
DK		 4264 unsigned int journal_inum)
4265{
4266 struct inode *journal_inode;
4267 journal_t *journal;
4268
0390131b
FM		 4269 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4270
ac27a0ec
DK		 4271 /* First, test for the existence of a valid inode on disk. Bad
4272 * things happen if we iget() an unused inode, as the subsequent
4273 * iput() will try to delete it. */
4274
1d1fe1ee
DH		 4275 journal_inode = ext4_iget(sb, journal_inum);
4276 if (IS_ERR(journal_inode)) {
b31e1552 4277 ext4_msg(sb, KERN_ERR, "no journal found");
ac27a0ec
DK		 4278 return NULL;
4279 }
4280 if (!journal_inode->i_nlink) {
4281 make_bad_inode(journal_inode);
4282 iput(journal_inode);
b31e1552 4283 ext4_msg(sb, KERN_ERR, "journal inode is deleted");
ac27a0ec
DK		 4284 return NULL;
4285 }
4286
e5f8eab8 4287 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
ac27a0ec 4288 journal_inode, journal_inode->i_size);
1d1fe1ee 4289 if (!S_ISREG(journal_inode->i_mode)) {
b31e1552 4290 ext4_msg(sb, KERN_ERR, "invalid journal inode");
ac27a0ec
DK		 4291 iput(journal_inode);
4292 return NULL;
4293 }
4294
dab291af 4295 journal = jbd2_journal_init_inode(journal_inode);
ac27a0ec 4296 if (!journal) {
b31e1552 4297 ext4_msg(sb, KERN_ERR, "Could not load journal inode");
ac27a0ec
DK		 4298 iput(journal_inode);
4299 return NULL;
4300 }
4301 journal->j_private = sb;
617ba13b 4302 ext4_init_journal_params(sb, journal);
ac27a0ec
DK		 4303 return journal;
4304}
4305
617ba13b 4306static journal_t *ext4_get_dev_journal(struct super_block *sb,
ac27a0ec
DK		 4307 dev_t j_dev)
4308{
2b2d6d01 4309 struct buffer_head *bh;
ac27a0ec 4310 journal_t *journal;
617ba13b
MC		 4311 ext4_fsblk_t start;
4312 ext4_fsblk_t len;
ac27a0ec 4313 int hblock, blocksize;
617ba13b 4314 ext4_fsblk_t sb_block;
ac27a0ec 4315 unsigned long offset;
2b2d6d01 4316 struct ext4_super_block *es;
ac27a0ec
DK		 4317 struct block_device *bdev;
4318
0390131b
FM		 4319 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4320
b31e1552 4321 bdev = ext4_blkdev_get(j_dev, sb);
ac27a0ec
DK		 4322 if (bdev == NULL)
4323 return NULL;
4324
ac27a0ec 4325 blocksize = sb->s_blocksize;
e1defc4f 4326 hblock = bdev_logical_block_size(bdev);
ac27a0ec 4327 if (blocksize < hblock) {
b31e1552
ES		 4328 ext4_msg(sb, KERN_ERR,
4329 "blocksize too small for journal device");
ac27a0ec
DK		 4330 goto out_bdev;
4331 }
4332
617ba13b
MC		 4333 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
4334 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
ac27a0ec
DK		 4335 set_blocksize(bdev, blocksize);
4336 if (!(bh = __bread(bdev, sb_block, blocksize))) {
b31e1552
ES		 4337 ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
4338 "external journal");
ac27a0ec
DK		 4339 goto out_bdev;
4340 }
4341
2716b802 4342 es = (struct ext4_super_block *) (bh->b_data + offset);
617ba13b 4343 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
ac27a0ec 4344 !(le32_to_cpu(es->s_feature_incompat) &
617ba13b 4345 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
b31e1552
ES		 4346 ext4_msg(sb, KERN_ERR, "external journal has "
4347 "bad superblock");
ac27a0ec
DK		 4348 brelse(bh);
4349 goto out_bdev;
4350 }
4351
617ba13b 4352 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
b31e1552 4353 ext4_msg(sb, KERN_ERR, "journal UUID does not match");
ac27a0ec
DK		 4354 brelse(bh);
4355 goto out_bdev;
4356 }
4357
bd81d8ee 4358 len = ext4_blocks_count(es);
ac27a0ec
DK		 4359 start = sb_block + 1;
4360 brelse(bh); /* we're done with the superblock */
4361
dab291af 4362 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
ac27a0ec
DK		 4363 start, len, blocksize);
4364 if (!journal) {
b31e1552 4365 ext4_msg(sb, KERN_ERR, "failed to create device journal");
ac27a0ec
DK		 4366 goto out_bdev;
4367 }
4368 journal->j_private = sb;
9f203507 4369 ll_rw_block(READ | REQ_META | REQ_PRIO, 1, &journal->j_sb_buffer);
ac27a0ec
DK		 4370 wait_on_buffer(journal->j_sb_buffer);
4371 if (!buffer_uptodate(journal->j_sb_buffer)) {
b31e1552 4372 ext4_msg(sb, KERN_ERR, "I/O error on journal device");
ac27a0ec
DK		 4373 goto out_journal;
4374 }
4375 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
b31e1552
ES		 4376 ext4_msg(sb, KERN_ERR, "External journal has more than one "
4377 "user (unsupported) - %d",
ac27a0ec
DK		 4378 be32_to_cpu(journal->j_superblock->s_nr_users));
4379 goto out_journal;
4380 }
617ba13b
MC		 4381 EXT4_SB(sb)->journal_bdev = bdev;
4382 ext4_init_journal_params(sb, journal);
ac27a0ec 4383 return journal;
0b8e58a1 4384
ac27a0ec 4385out_journal:
dab291af 4386 jbd2_journal_destroy(journal);
ac27a0ec 4387out_bdev:
617ba13b 4388 ext4_blkdev_put(bdev);
ac27a0ec
DK		 4389 return NULL;
4390}
4391
617ba13b
MC		 4392static int ext4_load_journal(struct super_block *sb,
4393 struct ext4_super_block *es,
ac27a0ec
DK		 4394 unsigned long journal_devnum)
4395{
4396 journal_t *journal;
4397 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
4398 dev_t journal_dev;
4399 int err = 0;
4400 int really_read_only;
4401
0390131b
FM		 4402 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4403
ac27a0ec
DK		 4404 if (journal_devnum &&
4405 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
b31e1552
ES		 4406 ext4_msg(sb, KERN_INFO, "external journal device major/minor "
4407 "numbers have changed");
ac27a0ec
DK		 4408 journal_dev = new_decode_dev(journal_devnum);
4409 } else
4410 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
4411
4412 really_read_only = bdev_read_only(sb->s_bdev);
4413
4414 /*
4415 * Are we loading a blank journal or performing recovery after a
4416 * crash? For recovery, we need to check in advance whether we
4417 * can get read-write access to the device.
4418 */
617ba13b 4419 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
ac27a0ec 4420 if (sb->s_flags & MS_RDONLY) {
b31e1552
ES		 4421 ext4_msg(sb, KERN_INFO, "INFO: recovery "
4422 "required on readonly filesystem");
ac27a0ec 4423 if (really_read_only) {
b31e1552
ES		 4424 ext4_msg(sb, KERN_ERR, "write access "
4425 "unavailable, cannot proceed");
ac27a0ec
DK		 4426 return -EROFS;
4427 }
b31e1552
ES		 4428 ext4_msg(sb, KERN_INFO, "write access will "
4429 "be enabled during recovery");
ac27a0ec
DK		 4430 }
4431 }
4432
4433 if (journal_inum && journal_dev) {
b31e1552
ES		 4434 ext4_msg(sb, KERN_ERR, "filesystem has both journal "
4435 "and inode journals!");
ac27a0ec
DK		 4436 return -EINVAL;
4437 }
4438
4439 if (journal_inum) {
617ba13b 4440 if (!(journal = ext4_get_journal(sb, journal_inum)))
ac27a0ec
DK		 4441 return -EINVAL;
4442 } else {
617ba13b 4443 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
ac27a0ec
DK		 4444 return -EINVAL;
4445 }
4446
90576c0b 4447 if (!(journal->j_flags & JBD2_BARRIER))
b31e1552 4448 ext4_msg(sb, KERN_INFO, "barriers disabled");
4776004f 4449
617ba13b 4450 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
dab291af 4451 err = jbd2_journal_wipe(journal, !really_read_only);
1c13d5c0
TT		 4452 if (!err) {
4453 char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL);
4454 if (save)
4455 memcpy(save, ((char *) es) +
4456 EXT4_S_ERR_START, EXT4_S_ERR_LEN);
dab291af 4457 err = jbd2_journal_load(journal);
1c13d5c0
TT		 4458 if (save)
4459 memcpy(((char *) es) + EXT4_S_ERR_START,
4460 save, EXT4_S_ERR_LEN);
4461 kfree(save);
4462 }
ac27a0ec
DK		 4463
4464 if (err) {
b31e1552 4465 ext4_msg(sb, KERN_ERR, "error loading journal");
dab291af 4466 jbd2_journal_destroy(journal);
ac27a0ec
DK		 4467 return err;
4468 }
4469
617ba13b
MC		 4470 EXT4_SB(sb)->s_journal = journal;
4471 ext4_clear_journal_err(sb, es);
ac27a0ec 4472
c41303ce 4473 if (!really_read_only && journal_devnum &&
ac27a0ec
DK		 4474 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
4475 es->s_journal_dev = cpu_to_le32(journal_devnum);
ac27a0ec
DK		 4476
4477 /* Make sure we flush the recovery flag to disk. */
e2d67052 4478 ext4_commit_super(sb, 1);
ac27a0ec
DK		 4479 }
4480
4481 return 0;
4482}
4483
e2d67052 4484static int ext4_commit_super(struct super_block *sb, int sync)
ac27a0ec 4485{
e2d67052 4486 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
617ba13b 4487 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
c4be0c1d 4488 int error = 0;
ac27a0ec 4489
7c2e7087 4490 if (!sbh || block_device_ejected(sb))
c4be0c1d 4491 return error;
914258bf
TT		 4492 if (buffer_write_io_error(sbh)) {
4493 /*
4494 * Oh, dear. A previous attempt to write the
4495 * superblock failed. This could happen because the
4496 * USB device was yanked out. Or it could happen to
4497 * be a transient write error and maybe the block will
4498 * be remapped. Nothing we can do but to retry the
4499 * write and hope for the best.
4500 */
b31e1552
ES		 4501 ext4_msg(sb, KERN_ERR, "previous I/O error to "
4502 "superblock detected");
914258bf
TT		 4503 clear_buffer_write_io_error(sbh);
4504 set_buffer_uptodate(sbh);
4505 }
71290b36
TT		 4506 /*
4507 * If the file system is mounted read-only, don't update the
4508 * superblock write time. This avoids updating the superblock
4509 * write time when we are mounting the root file system
4510 * read/only but we need to replay the journal; at that point,
4511 * for people who are east of GMT and who make their clock
4512 * tick in localtime for Windows bug-for-bug compatibility,
4513 * the clock is set in the future, and this will cause e2fsck
4514 * to complain and force a full file system check.
4515 */
4516 if (!(sb->s_flags & MS_RDONLY))
4517 es->s_wtime = cpu_to_le32(get_seconds());
f613dfcb
TT		 4518 if (sb->s_bdev->bd_part)
4519 es->s_kbytes_written =
4520 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written +
afc32f7e
TT		 4521 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
4522 EXT4_SB(sb)->s_sectors_written_start) >> 1));
f613dfcb
TT		 4523 else
4524 es->s_kbytes_written =
4525 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written);
57042651
TT		 4526 ext4_free_blocks_count_set(es,
4527 EXT4_C2B(EXT4_SB(sb), percpu_counter_sum_positive(
4528 &EXT4_SB(sb)->s_freeclusters_counter)));
ce7e010a
TT		 4529 es->s_free_inodes_count =
4530 cpu_to_le32(percpu_counter_sum_positive(
4531 &EXT4_SB(sb)->s_freeinodes_counter));
ac27a0ec 4532 BUFFER_TRACE(sbh, "marking dirty");
06db49e6 4533 ext4_superblock_csum_set(sb);
ac27a0ec 4534 mark_buffer_dirty(sbh);
914258bf 4535 if (sync) {
c4be0c1d
TS		 4536 error = sync_dirty_buffer(sbh);
4537 if (error)
4538 return error;
4539
4540 error = buffer_write_io_error(sbh);
4541 if (error) {
b31e1552
ES		 4542 ext4_msg(sb, KERN_ERR, "I/O error while writing "
4543 "superblock");
914258bf
TT		 4544 clear_buffer_write_io_error(sbh);
4545 set_buffer_uptodate(sbh);
4546 }
4547 }
c4be0c1d 4548 return error;
ac27a0ec
DK		 4549}
4550
ac27a0ec
DK		 4551/*
4552 * Have we just finished recovery? If so, and if we are mounting (or
4553 * remounting) the filesystem readonly, then we will end up with a
4554 * consistent fs on disk. Record that fact.
4555 */
2b2d6d01
TT		 4556static void ext4_mark_recovery_complete(struct super_block *sb,
4557 struct ext4_super_block *es)
ac27a0ec 4558{
617ba13b 4559 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 4560
0390131b
FM		 4561 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
4562 BUG_ON(journal != NULL);
4563 return;
4564 }
dab291af 4565 jbd2_journal_lock_updates(journal);
7ffe1ea8
HK		 4566 if (jbd2_journal_flush(journal) < 0)
4567 goto out;
4568
617ba13b 4569 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
ac27a0ec 4570 sb->s_flags & MS_RDONLY) {
617ba13b 4571 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
e2d67052 4572 ext4_commit_super(sb, 1);
ac27a0ec 4573 }
7ffe1ea8
HK		 4574
4575out:
dab291af 4576 jbd2_journal_unlock_updates(journal);
ac27a0ec
DK		 4577}
4578
4579/*
4580 * If we are mounting (or read-write remounting) a filesystem whose journal
4581 * has recorded an error from a previous lifetime, move that error to the
4582 * main filesystem now.
4583 */
2b2d6d01
TT		 4584static void ext4_clear_journal_err(struct super_block *sb,
4585 struct ext4_super_block *es)
ac27a0ec
DK		 4586{
4587 journal_t *journal;
4588 int j_errno;
4589 const char *errstr;
4590
0390131b
FM		 4591 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4592
617ba13b 4593 journal = EXT4_SB(sb)->s_journal;
ac27a0ec
DK		 4594
4595 /*
4596 * Now check for any error status which may have been recorded in the
617ba13b 4597 * journal by a prior ext4_error() or ext4_abort()
ac27a0ec
DK		 4598 */
4599
dab291af 4600 j_errno = jbd2_journal_errno(journal);
ac27a0ec
DK		 4601 if (j_errno) {
4602 char nbuf[16];
4603
617ba13b 4604 errstr = ext4_decode_error(sb, j_errno, nbuf);
12062ddd 4605 ext4_warning(sb, "Filesystem error recorded "
ac27a0ec 4606 "from previous mount: %s", errstr);
12062ddd 4607 ext4_warning(sb, "Marking fs in need of filesystem check.");
ac27a0ec 4608
617ba13b
MC		 4609 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
4610 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
e2d67052 4611 ext4_commit_super(sb, 1);
ac27a0ec 4612
dab291af 4613 jbd2_journal_clear_err(journal);
d796c52e 4614 jbd2_journal_update_sb_errno(journal);
ac27a0ec
DK		 4615 }
4616}
4617
4618/*
4619 * Force the running and committing transactions to commit,
4620 * and wait on the commit.
4621 */
617ba13b 4622int ext4_force_commit(struct super_block *sb)
ac27a0ec
DK		 4623{
4624 journal_t *journal;
ac27a0ec
DK		 4625
4626 if (sb->s_flags & MS_RDONLY)
4627 return 0;
4628
617ba13b 4629 journal = EXT4_SB(sb)->s_journal;
b1deefc9 4630 return ext4_journal_force_commit(journal);
ac27a0ec
DK		 4631}
4632
617ba13b 4633static int ext4_sync_fs(struct super_block *sb, int wait)
ac27a0ec 4634{
14ce0cb4 4635 int ret = 0;
9eddacf9 4636 tid_t target;
06a407f1 4637 bool needs_barrier = false;
8d5d02e6 4638 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4639
9bffad1e 4640 trace_ext4_sync_fs(sb, wait);
2e8fa54e 4641 flush_workqueue(sbi->rsv_conversion_wq);
a1177825
JK		 4642 /*
4643 * Writeback quota in non-journalled quota case - journalled quota has
4644 * no dirty dquots
4645 */
4646 dquot_writeback_dquots(sb, -1);
06a407f1
DM		 4647 /*
4648 * Data writeback is possible w/o journal transaction, so barrier must
4649 * being sent at the end of the function. But we can skip it if
4650 * transaction_commit will do it for us.
4651 */
4652 target = jbd2_get_latest_transaction(sbi->s_journal);
4653 if (wait && sbi->s_journal->j_flags & JBD2_BARRIER &&
4654 !jbd2_trans_will_send_data_barrier(sbi->s_journal, target))
4655 needs_barrier = true;
4656
8d5d02e6 4657 if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
9ca92389 4658 if (wait)
06a407f1
DM		 4659 ret = jbd2_log_wait_commit(sbi->s_journal, target);
4660 }
4661 if (needs_barrier) {
4662 int err;
4663 err = blkdev_issue_flush(sb->s_bdev, GFP_KERNEL, NULL);
4664 if (!ret)
4665 ret = err;
0390131b 4666 }
06a407f1
DM		 4667
4668 return ret;
4669}
4670
4671static int ext4_sync_fs_nojournal(struct super_block *sb, int wait)
4672{
4673 int ret = 0;
4674
4675 trace_ext4_sync_fs(sb, wait);
4676 flush_workqueue(EXT4_SB(sb)->rsv_conversion_wq);
06a407f1
DM		 4677 dquot_writeback_dquots(sb, -1);
4678 if (wait && test_opt(sb, BARRIER))
4679 ret = blkdev_issue_flush(sb->s_bdev, GFP_KERNEL, NULL);
4680
14ce0cb4 4681 return ret;
ac27a0ec
DK		 4682}
4683
4684/*
4685 * LVM calls this function before a (read-only) snapshot is created. This
4686 * gives us a chance to flush the journal completely and mark the fs clean.
be4f27d3
YY		 4687 *
4688 * Note that only this function cannot bring a filesystem to be in a clean
8e8ad8a5
JK		 4689 * state independently. It relies on upper layer to stop all data & metadata
4690 * modifications.
ac27a0ec 4691 */
c4be0c1d 4692static int ext4_freeze(struct super_block *sb)
ac27a0ec 4693{
c4be0c1d
TS		 4694 int error = 0;
4695 journal_t *journal;
ac27a0ec 4696
9ca92389
TT		 4697 if (sb->s_flags & MS_RDONLY)
4698 return 0;
ac27a0ec 4699
9ca92389 4700 journal = EXT4_SB(sb)->s_journal;
7ffe1ea8 4701
9ca92389
TT		 4702 /* Now we set up the journal barrier. */
4703 jbd2_journal_lock_updates(journal);
ac27a0ec 4704
9ca92389
TT		 4705 /*
4706 * Don't clear the needs_recovery flag if we failed to flush
4707 * the journal.
4708 */
4709 error = jbd2_journal_flush(journal);
6b0310fb
ES		 4710 if (error < 0)
4711 goto out;
9ca92389
TT		 4712
4713 /* Journal blocked and flushed, clear needs_recovery flag. */
4714 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4715 error = ext4_commit_super(sb, 1);
6b0310fb 4716out:
8e8ad8a5 4717 /* we rely on upper layer to stop further updates */
6b0310fb
ES		 4718 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
4719 return error;
ac27a0ec
DK		 4720}
4721
4722/*
4723 * Called by LVM after the snapshot is done. We need to reset the RECOVER
4724 * flag here, even though the filesystem is not technically dirty yet.
4725 */
c4be0c1d 4726static int ext4_unfreeze(struct super_block *sb)
ac27a0ec 4727{
9ca92389
TT		 4728 if (sb->s_flags & MS_RDONLY)
4729 return 0;
4730
9ca92389
TT		 4731 /* Reset the needs_recovery flag before the fs is unlocked. */
4732 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4733 ext4_commit_super(sb, 1);
c4be0c1d 4734 return 0;
ac27a0ec
DK		 4735}
4736
673c6100
TT		 4737/*
4738 * Structure to save mount options for ext4_remount's benefit
4739 */
4740struct ext4_mount_options {
4741 unsigned long s_mount_opt;
a2595b8a 4742 unsigned long s_mount_opt2;
08cefc7a
EB		 4743 kuid_t s_resuid;
4744 kgid_t s_resgid;
673c6100
TT		 4745 unsigned long s_commit_interval;
4746 u32 s_min_batch_time, s_max_batch_time;
4747#ifdef CONFIG_QUOTA
4748 int s_jquota_fmt;
4749 char *s_qf_names[MAXQUOTAS];
4750#endif
4751};
4752
2b2d6d01 4753static int ext4_remount(struct super_block *sb, int *flags, char *data)
ac27a0ec 4754{
2b2d6d01 4755 struct ext4_super_block *es;
617ba13b 4756 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4757 unsigned long old_sb_flags;
617ba13b 4758 struct ext4_mount_options old_opts;
c79d967d 4759 int enable_quota = 0;
8a266467 4760 ext4_group_t g;
b3881f74 4761 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
c5e06d10 4762 int err = 0;
ac27a0ec 4763#ifdef CONFIG_QUOTA
03dafb5f 4764 int i, j;
ac27a0ec 4765#endif
d4c402d9 4766 char *orig_data = kstrdup(data, GFP_KERNEL);
ac27a0ec
DK		 4767
4768 /* Store the original options */
4769 old_sb_flags = sb->s_flags;
4770 old_opts.s_mount_opt = sbi->s_mount_opt;
a2595b8a 4771 old_opts.s_mount_opt2 = sbi->s_mount_opt2;
ac27a0ec
DK		 4772 old_opts.s_resuid = sbi->s_resuid;
4773 old_opts.s_resgid = sbi->s_resgid;
4774 old_opts.s_commit_interval = sbi->s_commit_interval;
30773840
TT		 4775 old_opts.s_min_batch_time = sbi->s_min_batch_time;
4776 old_opts.s_max_batch_time = sbi->s_max_batch_time;
ac27a0ec
DK		 4777#ifdef CONFIG_QUOTA
4778 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
4779 for (i = 0; i < MAXQUOTAS; i++)
03dafb5f
CG		 4780 if (sbi->s_qf_names[i]) {
4781 old_opts.s_qf_names[i] = kstrdup(sbi->s_qf_names[i],
4782 GFP_KERNEL);
4783 if (!old_opts.s_qf_names[i]) {
4784 for (j = 0; j < i; j++)
4785 kfree(old_opts.s_qf_names[j]);
3e36a163 4786 kfree(orig_data);
03dafb5f
CG		 4787 return -ENOMEM;
4788 }
4789 } else
4790 old_opts.s_qf_names[i] = NULL;
ac27a0ec 4791#endif
b3881f74
TT		 4792 if (sbi->s_journal && sbi->s_journal->j_task->io_context)
4793 journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
ac27a0ec
DK		 4794
4795 /*
4796 * Allow the "check" option to be passed as a remount option.
4797 */
661aa520 4798 if (!parse_options(data, sb, NULL, &journal_ioprio, 1)) {
ac27a0ec
DK		 4799 err = -EINVAL;
4800 goto restore_opts;
4801 }
4802
6ae6514b
PS		 4803 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
4804 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
4805 ext4_msg(sb, KERN_ERR, "can't mount with "
4806 "both data=journal and delalloc");
4807 err = -EINVAL;
4808 goto restore_opts;
4809 }
4810 if (test_opt(sb, DIOREAD_NOLOCK)) {
4811 ext4_msg(sb, KERN_ERR, "can't mount with "
4812 "both data=journal and dioread_nolock");
4813 err = -EINVAL;
4814 goto restore_opts;
4815 }
4816 }
4817
4ab2f15b 4818 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
c67d859e 4819 ext4_abort(sb, "Abort forced by user");
ac27a0ec
DK		 4820
4821 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
482a7425 4822 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec
DK		 4823
4824 es = sbi->s_es;
4825
b3881f74 4826 if (sbi->s_journal) {
0390131b 4827 ext4_init_journal_params(sb, sbi->s_journal);
b3881f74
TT		 4828 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
4829 }
ac27a0ec 4830
661aa520 4831 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
4ab2f15b 4832 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) {
ac27a0ec
DK		 4833 err = -EROFS;
4834 goto restore_opts;
4835 }
4836
4837 if (*flags & MS_RDONLY) {
38c03b34
TT		 4838 err = sync_filesystem(sb);
4839 if (err < 0)
4840 goto restore_opts;
0f0dd62f
CH		 4841 err = dquot_suspend(sb, -1);
4842 if (err < 0)
c79d967d 4843 goto restore_opts;
c79d967d 4844
ac27a0ec
DK		 4845 /*
4846 * First of all, the unconditional stuff we have to do
4847 * to disable replay of the journal when we next remount
4848 */
4849 sb->s_flags |= MS_RDONLY;
4850
4851 /*
4852 * OK, test if we are remounting a valid rw partition
4853 * readonly, and if so set the rdonly flag and then
4854 * mark the partition as valid again.
4855 */
617ba13b
MC		 4856 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
4857 (sbi->s_mount_state & EXT4_VALID_FS))
ac27a0ec
DK		 4858 es->s_state = cpu_to_le16(sbi->s_mount_state);
4859
a63c9eb2 4860 if (sbi->s_journal)
0390131b 4861 ext4_mark_recovery_complete(sb, es);
ac27a0ec 4862 } else {
a13fb1a4
ES		 4863 /* Make sure we can mount this feature set readwrite */
4864 if (!ext4_feature_set_ok(sb, 0)) {
ac27a0ec
DK		 4865 err = -EROFS;
4866 goto restore_opts;
4867 }
8a266467
TT		 4868 /*
4869 * Make sure the group descriptor checksums
0b8e58a1 4870 * are sane. If they aren't, refuse to remount r/w.
8a266467
TT		 4871 */
4872 for (g = 0; g < sbi->s_groups_count; g++) {
4873 struct ext4_group_desc *gdp =
4874 ext4_get_group_desc(sb, g, NULL);
4875
feb0ab32 4876 if (!ext4_group_desc_csum_verify(sb, g, gdp)) {
b31e1552
ES		 4877 ext4_msg(sb, KERN_ERR,
4878 "ext4_remount: Checksum for group %u failed (%u!=%u)",
8a266467
TT		 4879 g, le16_to_cpu(ext4_group_desc_csum(sbi, g, gdp)),
4880 le16_to_cpu(gdp->bg_checksum));
4881 err = -EINVAL;
4882 goto restore_opts;
4883 }
4884 }
4885
ead6596b
ES		 4886 /*
4887 * If we have an unprocessed orphan list hanging
4888 * around from a previously readonly bdev mount,
4889 * require a full umount/remount for now.
4890 */
4891 if (es->s_last_orphan) {
b31e1552 4892 ext4_msg(sb, KERN_WARNING, "Couldn't "
ead6596b
ES		 4893 "remount RDWR because of unprocessed "
4894 "orphan inode list. Please "
b31e1552 4895 "umount/remount instead");
ead6596b
ES		 4896 err = -EINVAL;
4897 goto restore_opts;
4898 }
4899
ac27a0ec
DK		 4900 /*
4901 * Mounting a RDONLY partition read-write, so reread
4902 * and store the current valid flag. (It may have
4903 * been changed by e2fsck since we originally mounted
4904 * the partition.)
4905 */
0390131b
FM		 4906 if (sbi->s_journal)
4907 ext4_clear_journal_err(sb, es);
ac27a0ec 4908 sbi->s_mount_state = le16_to_cpu(es->s_state);
2b2d6d01 4909 if (!ext4_setup_super(sb, es, 0))
ac27a0ec 4910 sb->s_flags &= ~MS_RDONLY;
c5e06d10
JL		 4911 if (EXT4_HAS_INCOMPAT_FEATURE(sb,
4912 EXT4_FEATURE_INCOMPAT_MMP))
4913 if (ext4_multi_mount_protect(sb,
4914 le64_to_cpu(es->s_mmp_block))) {
4915 err = -EROFS;
4916 goto restore_opts;
4917 }
c79d967d 4918 enable_quota = 1;
ac27a0ec
DK		 4919 }
4920 }
bfff6873
LC		 4921
4922 /*
4923 * Reinitialize lazy itable initialization thread based on
4924 * current settings
4925 */
4926 if ((sb->s_flags & MS_RDONLY) || !test_opt(sb, INIT_INODE_TABLE))
4927 ext4_unregister_li_request(sb);
4928 else {
4929 ext4_group_t first_not_zeroed;
4930 first_not_zeroed = ext4_has_uninit_itable(sb);
4931 ext4_register_li_request(sb, first_not_zeroed);
4932 }
4933
6fd058f7 4934 ext4_setup_system_zone(sb);
d096ad0f 4935 if (sbi->s_journal == NULL && !(old_sb_flags & MS_RDONLY))
e2d67052 4936 ext4_commit_super(sb, 1);
0390131b 4937
ac27a0ec
DK		 4938#ifdef CONFIG_QUOTA
4939 /* Release old quota file names */
4940 for (i = 0; i < MAXQUOTAS; i++)
03dafb5f 4941 kfree(old_opts.s_qf_names[i]);
7c319d32
AK		 4942 if (enable_quota) {
4943 if (sb_any_quota_suspended(sb))
4944 dquot_resume(sb, -1);
4945 else if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
4946 EXT4_FEATURE_RO_COMPAT_QUOTA)) {
4947 err = ext4_enable_quotas(sb);
07724f98 4948 if (err)
7c319d32 4949 goto restore_opts;
7c319d32
AK		 4950 }
4951 }
ac27a0ec 4952#endif
d4c402d9
CW		 4953
4954 ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s", orig_data);
4955 kfree(orig_data);
ac27a0ec 4956 return 0;
0b8e58a1 4957
ac27a0ec
DK		 4958restore_opts:
4959 sb->s_flags = old_sb_flags;
4960 sbi->s_mount_opt = old_opts.s_mount_opt;
a2595b8a 4961 sbi->s_mount_opt2 = old_opts.s_mount_opt2;
ac27a0ec
DK		 4962 sbi->s_resuid = old_opts.s_resuid;
4963 sbi->s_resgid = old_opts.s_resgid;
4964 sbi->s_commit_interval = old_opts.s_commit_interval;
30773840
TT		 4965 sbi->s_min_batch_time = old_opts.s_min_batch_time;
4966 sbi->s_max_batch_time = old_opts.s_max_batch_time;
ac27a0ec
DK		 4967#ifdef CONFIG_QUOTA
4968 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
4969 for (i = 0; i < MAXQUOTAS; i++) {
03dafb5f 4970 kfree(sbi->s_qf_names[i]);
ac27a0ec
DK		 4971 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
4972 }
4973#endif
d4c402d9 4974 kfree(orig_data);
ac27a0ec
DK		 4975 return err;
4976}
4977
2b2d6d01 4978static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
ac27a0ec
DK		 4979{
4980 struct super_block *sb = dentry->d_sb;
617ba13b
MC		 4981 struct ext4_sb_info *sbi = EXT4_SB(sb);
4982 struct ext4_super_block *es = sbi->s_es;
27dd4385 4983 ext4_fsblk_t overhead = 0, resv_blocks;
960cc398 4984 u64 fsid;
d02a9391 4985 s64 bfree;
27dd4385 4986 resv_blocks = EXT4_C2B(sbi, atomic64_read(&sbi->s_resv_clusters));
ac27a0ec 4987
952fc18e
TT		 4988 if (!test_opt(sb, MINIX_DF))
4989 overhead = sbi->s_overhead;
ac27a0ec 4990
617ba13b 4991 buf->f_type = EXT4_SUPER_MAGIC;
ac27a0ec 4992 buf->f_bsize = sb->s_blocksize;
b72f78cb 4993 buf->f_blocks = ext4_blocks_count(es) - EXT4_C2B(sbi, overhead);
57042651
TT		 4994 bfree = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) -
4995 percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter);
d02a9391 4996 /* prevent underflow in case that few free space is available */
57042651 4997 buf->f_bfree = EXT4_C2B(sbi, max_t(s64, bfree, 0));
27dd4385
LC		 4998 buf->f_bavail = buf->f_bfree -
4999 (ext4_r_blocks_count(es) + resv_blocks);
5000 if (buf->f_bfree < (ext4_r_blocks_count(es) + resv_blocks))
ac27a0ec
DK		 5001 buf->f_bavail = 0;
5002 buf->f_files = le32_to_cpu(es->s_inodes_count);
52d9f3b4 5003 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
617ba13b 5004 buf->f_namelen = EXT4_NAME_LEN;
960cc398
PE		 5005 fsid = le64_to_cpup((void *)es->s_uuid) ^
5006 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
5007 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
5008 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
0b8e58a1 5009
ac27a0ec
DK		 5010 return 0;
5011}
5012
0b8e58a1
AD		 5013/* Helper function for writing quotas on sync - we need to start transaction
5014 * before quota file is locked for write. Otherwise the are possible deadlocks:
ac27a0ec 5015 * Process 1 Process 2
617ba13b 5016 * ext4_create() quota_sync()
a269eb18 5017 * jbd2_journal_start() write_dquot()
871a2931 5018 * dquot_initialize() down(dqio_mutex)
dab291af 5019 * down(dqio_mutex) jbd2_journal_start()
ac27a0ec
DK		 5020 *
5021 */
5022
5023#ifdef CONFIG_QUOTA
5024
5025static inline struct inode *dquot_to_inode(struct dquot *dquot)
5026{
4c376dca 5027 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_id.type];
ac27a0ec
DK		 5028}
5029
617ba13b 5030static int ext4_write_dquot(struct dquot *dquot)
ac27a0ec
DK		 5031{
5032 int ret, err;
5033 handle_t *handle;
5034 struct inode *inode;
5035
5036 inode = dquot_to_inode(dquot);
9924a92a 5037 handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
0b8e58a1 5038 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 5039 if (IS_ERR(handle))
5040 return PTR_ERR(handle);
5041 ret = dquot_commit(dquot);
617ba13b 5042 err = ext4_journal_stop(handle);
ac27a0ec
DK		 5043 if (!ret)
5044 ret = err;
5045 return ret;
5046}
5047
617ba13b 5048static int ext4_acquire_dquot(struct dquot *dquot)
ac27a0ec
DK		 5049{
5050 int ret, err;
5051 handle_t *handle;
5052
9924a92a 5053 handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
0b8e58a1 5054 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 5055 if (IS_ERR(handle))
5056 return PTR_ERR(handle);
5057 ret = dquot_acquire(dquot);
617ba13b 5058 err = ext4_journal_stop(handle);
ac27a0ec
DK		 5059 if (!ret)
5060 ret = err;
5061 return ret;
5062}
5063
617ba13b 5064static int ext4_release_dquot(struct dquot *dquot)
ac27a0ec
DK		 5065{
5066 int ret, err;
5067 handle_t *handle;
5068
9924a92a 5069 handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
0b8e58a1 5070 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
9c3013e9
JK		 5071 if (IS_ERR(handle)) {
5072 /* Release dquot anyway to avoid endless cycle in dqput() */
5073 dquot_release(dquot);
ac27a0ec 5074 return PTR_ERR(handle);
9c3013e9 5075 }
ac27a0ec 5076 ret = dquot_release(dquot);
617ba13b 5077 err = ext4_journal_stop(handle);
ac27a0ec
DK		 5078 if (!ret)
5079 ret = err;
5080 return ret;
5081}
5082
617ba13b 5083static int ext4_mark_dquot_dirty(struct dquot *dquot)
ac27a0ec 5084{
262b4662
JK		 5085 struct super_block *sb = dquot->dq_sb;
5086 struct ext4_sb_info *sbi = EXT4_SB(sb);
5087
2c8be6b2 5088 /* Are we journaling quotas? */
262b4662
JK		 5089 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) ||
5090 sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
ac27a0ec 5091 dquot_mark_dquot_dirty(dquot);
617ba13b 5092 return ext4_write_dquot(dquot);
ac27a0ec
DK		 5093 } else {
5094 return dquot_mark_dquot_dirty(dquot);
5095 }
5096}
5097
617ba13b 5098static int ext4_write_info(struct super_block *sb, int type)
ac27a0ec
DK		 5099{
5100 int ret, err;
5101 handle_t *handle;
5102
5103 /* Data block + inode block */
9924a92a 5104 handle = ext4_journal_start(sb->s_root->d_inode, EXT4_HT_QUOTA, 2);
ac27a0ec
DK		 5105 if (IS_ERR(handle))
5106 return PTR_ERR(handle);
5107 ret = dquot_commit_info(sb, type);
617ba13b 5108 err = ext4_journal_stop(handle);
ac27a0ec
DK		 5109 if (!ret)
5110 ret = err;
5111 return ret;
5112}
5113
5114/*
5115 * Turn on quotas during mount time - we need to find
5116 * the quota file and such...
5117 */
617ba13b 5118static int ext4_quota_on_mount(struct super_block *sb, int type)
ac27a0ec 5119{
287a8095
CH		 5120 return dquot_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
5121 EXT4_SB(sb)->s_jquota_fmt, type);
ac27a0ec
DK		 5122}
5123
5124/*
5125 * Standard function to be called on quota_on
5126 */
617ba13b 5127static int ext4_quota_on(struct super_block *sb, int type, int format_id,
f00c9e44 5128 struct path *path)
ac27a0ec
DK		 5129{
5130 int err;
ac27a0ec
DK		 5131
5132 if (!test_opt(sb, QUOTA))
5133 return -EINVAL;
0623543b 5134
ac27a0ec 5135 /* Quotafile not on the same filesystem? */
d8c9584e 5136 if (path->dentry->d_sb != sb)
ac27a0ec 5137 return -EXDEV;
0623543b
JK		 5138 /* Journaling quota? */
5139 if (EXT4_SB(sb)->s_qf_names[type]) {
2b2d6d01 5140 /* Quotafile not in fs root? */
f00c9e44 5141 if (path->dentry->d_parent != sb->s_root)
b31e1552
ES		 5142 ext4_msg(sb, KERN_WARNING,
5143 "Quota file not on filesystem root. "
5144 "Journaled quota will not work");
2b2d6d01 5145 }
0623543b
JK		 5146
5147 /*
5148 * When we journal data on quota file, we have to flush journal to see
5149 * all updates to the file when we bypass pagecache...
5150 */
0390131b 5151 if (EXT4_SB(sb)->s_journal &&
f00c9e44 5152 ext4_should_journal_data(path->dentry->d_inode)) {
0623543b
JK		 5153 /*
5154 * We don't need to lock updates but journal_flush() could
5155 * otherwise be livelocked...
5156 */
5157 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
7ffe1ea8 5158 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
0623543b 5159 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
f00c9e44 5160 if (err)
7ffe1ea8 5161 return err;
0623543b
JK		 5162 }
5163
f00c9e44 5164 return dquot_quota_on(sb, type, format_id, path);
ac27a0ec
DK		 5165}
5166
7c319d32
AK		 5167static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
5168 unsigned int flags)
5169{
5170 int err;
5171 struct inode *qf_inode;
5172 unsigned long qf_inums[MAXQUOTAS] = {
5173 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
5174 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum)
5175 };
5176
5177 BUG_ON(!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA));
5178
5179 if (!qf_inums[type])
5180 return -EPERM;
5181
5182 qf_inode = ext4_iget(sb, qf_inums[type]);
5183 if (IS_ERR(qf_inode)) {
5184 ext4_error(sb, "Bad quota inode # %lu", qf_inums[type]);
5185 return PTR_ERR(qf_inode);
5186 }
5187
bcb13850
JK		 5188 /* Don't account quota for quota files to avoid recursion */
5189 qf_inode->i_flags |= S_NOQUOTA;
7c319d32
AK		 5190 err = dquot_enable(qf_inode, type, format_id, flags);
5191 iput(qf_inode);
5192
5193 return err;
5194}
5195
5196/* Enable usage tracking for all quota types. */
5197static int ext4_enable_quotas(struct super_block *sb)
5198{
5199 int type, err = 0;
5200 unsigned long qf_inums[MAXQUOTAS] = {
5201 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
5202 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum)
5203 };
5204
5205 sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE;
5206 for (type = 0; type < MAXQUOTAS; type++) {
5207 if (qf_inums[type]) {
5208 err = ext4_quota_enable(sb, type, QFMT_VFS_V1,
5209 DQUOT_USAGE_ENABLED);
5210 if (err) {
5211 ext4_warning(sb,
72ba7450
TT		 5212 "Failed to enable quota tracking "
5213 "(type=%d, err=%d). Please run "
5214 "e2fsck to fix.", type, err);
7c319d32
AK		 5215 return err;
5216 }
5217 }
5218 }
5219 return 0;
5220}
5221
5222/*
5223 * quota_on function that is used when QUOTA feature is set.
5224 */
5225static int ext4_quota_on_sysfile(struct super_block *sb, int type,
5226 int format_id)
5227{
5228 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA))
5229 return -EINVAL;
5230
5231 /*
5232 * USAGE was enabled at mount time. Only need to enable LIMITS now.
5233 */
5234 return ext4_quota_enable(sb, type, format_id, DQUOT_LIMITS_ENABLED);
5235}
5236
ca0e05e4
DM		 5237static int ext4_quota_off(struct super_block *sb, int type)
5238{
21f97697
JK		 5239 struct inode *inode = sb_dqopt(sb)->files[type];
5240 handle_t *handle;
5241
87009d86
DM		 5242 /* Force all delayed allocation blocks to be allocated.
5243 * Caller already holds s_umount sem */
5244 if (test_opt(sb, DELALLOC))
ca0e05e4 5245 sync_filesystem(sb);
ca0e05e4 5246
0b268590
AG		 5247 if (!inode)
5248 goto out;
5249
21f97697
JK		 5250 /* Update modification times of quota files when userspace can
5251 * start looking at them */
9924a92a 5252 handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1);
21f97697
JK		 5253 if (IS_ERR(handle))
5254 goto out;
5255 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
5256 ext4_mark_inode_dirty(handle, inode);
5257 ext4_journal_stop(handle);
5258
5259out:
ca0e05e4
DM		 5260 return dquot_quota_off(sb, type);
5261}
5262
7c319d32
AK		 5263/*
5264 * quota_off function that is used when QUOTA feature is set.
5265 */
5266static int ext4_quota_off_sysfile(struct super_block *sb, int type)
5267{
5268 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA))
5269 return -EINVAL;
5270
5271 /* Disable only the limits. */
5272 return dquot_disable(sb, type, DQUOT_LIMITS_ENABLED);
5273}
5274
ac27a0ec
DK		 5275/* Read data from quotafile - avoid pagecache and such because we cannot afford
5276 * acquiring the locks... As quota files are never truncated and quota code
25985edc 5277 * itself serializes the operations (and no one else should touch the files)
ac27a0ec 5278 * we don't have to be afraid of races */
617ba13b 5279static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec
DK		 5280 size_t len, loff_t off)
5281{
5282 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 5283 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 5284 int err = 0;
5285 int offset = off & (sb->s_blocksize - 1);
5286 int tocopy;
5287 size_t toread;
5288 struct buffer_head *bh;
5289 loff_t i_size = i_size_read(inode);
5290
5291 if (off > i_size)
5292 return 0;
5293 if (off+len > i_size)
5294 len = i_size-off;
5295 toread = len;
5296 while (toread > 0) {
5297 tocopy = sb->s_blocksize - offset < toread ?
5298 sb->s_blocksize - offset : toread;
617ba13b 5299 bh = ext4_bread(NULL, inode, blk, 0, &err);
ac27a0ec
DK		 5300 if (err)
5301 return err;
5302 if (!bh) /* A hole? */
5303 memset(data, 0, tocopy);
5304 else
5305 memcpy(data, bh->b_data+offset, tocopy);
5306 brelse(bh);
5307 offset = 0;
5308 toread -= tocopy;
5309 data += tocopy;
5310 blk++;
5311 }
5312 return len;
5313}
5314
5315/* Write to quotafile (we know the transaction is already started and has
5316 * enough credits) */
617ba13b 5317static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec
DK		 5318 const char *data, size_t len, loff_t off)
5319{
5320 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 5321 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 5322 int err = 0;
5323 int offset = off & (sb->s_blocksize - 1);
ac27a0ec
DK		 5324 struct buffer_head *bh;
5325 handle_t *handle = journal_current_handle();
5326
0390131b 5327 if (EXT4_SB(sb)->s_journal && !handle) {
b31e1552
ES		 5328 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
5329 " cancelled because transaction is not started",
9c3013e9
JK		 5330 (unsigned long long)off, (unsigned long long)len);
5331 return -EIO;
5332 }
67eeb568
DM		 5333 /*
5334 * Since we account only one data block in transaction credits,
5335 * then it is impossible to cross a block boundary.
5336 */
5337 if (sb->s_blocksize - offset < len) {
5338 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
5339 " cancelled because not block aligned",
5340 (unsigned long long)off, (unsigned long long)len);
5341 return -EIO;
5342 }
5343
67eeb568
DM		 5344 bh = ext4_bread(handle, inode, blk, 1, &err);
5345 if (!bh)
5346 goto out;
62d2b5f2
JK		 5347 err = ext4_journal_get_write_access(handle, bh);
5348 if (err) {
5349 brelse(bh);
5350 goto out;
ac27a0ec 5351 }
67eeb568
DM		 5352 lock_buffer(bh);
5353 memcpy(bh->b_data+offset, data, len);
5354 flush_dcache_page(bh->b_page);
5355 unlock_buffer(bh);
62d2b5f2 5356 err = ext4_handle_dirty_metadata(handle, NULL, bh);
67eeb568 5357 brelse(bh);
ac27a0ec 5358out:
0b7f7cef 5359 if (err)
ac27a0ec 5360 return err;
67eeb568
DM		 5361 if (inode->i_size < off + len) {
5362 i_size_write(inode, off + len);
617ba13b 5363 EXT4_I(inode)->i_disksize = inode->i_size;
21f97697 5364 ext4_mark_inode_dirty(handle, inode);
ac27a0ec 5365 }
67eeb568 5366 return len;
ac27a0ec
DK		 5367}
5368
5369#endif
5370
152a0836
AV		 5371static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
5372 const char *dev_name, void *data)
ac27a0ec 5373{
152a0836 5374 return mount_bdev(fs_type, flags, dev_name, data, ext4_fill_super);
ac27a0ec
DK		 5375}
5376
37f328eb 5377#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
24b58424
TT		 5378static inline void register_as_ext2(void)
5379{
5380 int err = register_filesystem(&ext2_fs_type);
5381 if (err)
5382 printk(KERN_WARNING
5383 "EXT4-fs: Unable to register as ext2 (%d)\n", err);
5384}
5385
5386static inline void unregister_as_ext2(void)
5387{
5388 unregister_filesystem(&ext2_fs_type);
5389}
2035e776
TT		 5390
5391static inline int ext2_feature_set_ok(struct super_block *sb)
5392{
5393 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP))
5394 return 0;
5395 if (sb->s_flags & MS_RDONLY)
5396 return 1;
5397 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))
5398 return 0;
5399 return 1;
5400}
24b58424
TT		 5401#else
5402static inline void register_as_ext2(void) { }
5403static inline void unregister_as_ext2(void) { }
2035e776 5404static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; }
24b58424
TT		 5405#endif
5406
37f328eb 5407#if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
24b58424
TT		 5408static inline void register_as_ext3(void)
5409{
5410 int err = register_filesystem(&ext3_fs_type);
5411 if (err)
5412 printk(KERN_WARNING
5413 "EXT4-fs: Unable to register as ext3 (%d)\n", err);
5414}
5415
5416static inline void unregister_as_ext3(void)
5417{
5418 unregister_filesystem(&ext3_fs_type);
5419}
2035e776
TT		 5420
5421static inline int ext3_feature_set_ok(struct super_block *sb)
5422{
5423 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP))
5424 return 0;
5425 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
5426 return 0;
5427 if (sb->s_flags & MS_RDONLY)
5428 return 1;
5429 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP))
5430 return 0;
5431 return 1;
5432}
24b58424
TT		 5433#else
5434static inline void register_as_ext3(void) { }
5435static inline void unregister_as_ext3(void) { }
2035e776 5436static inline int ext3_feature_set_ok(struct super_block *sb) { return 0; }
24b58424
TT		 5437#endif
5438
03010a33
TT		 5439static struct file_system_type ext4_fs_type = {
5440 .owner = THIS_MODULE,
5441 .name = "ext4",
152a0836 5442 .mount = ext4_mount,
03010a33
TT		 5443 .kill_sb = kill_block_super,
5444 .fs_flags = FS_REQUIRES_DEV,
5445};
7f78e035 5446MODULE_ALIAS_FS("ext4");
03010a33 5447
8f021222 5448static int __init ext4_init_feat_adverts(void)
857ac889
LC		 5449{
5450 struct ext4_features *ef;
5451 int ret = -ENOMEM;
5452
5453 ef = kzalloc(sizeof(struct ext4_features), GFP_KERNEL);
5454 if (!ef)
5455 goto out;
5456
5457 ef->f_kobj.kset = ext4_kset;
5458 init_completion(&ef->f_kobj_unregister);
5459 ret = kobject_init_and_add(&ef->f_kobj, &ext4_feat_ktype, NULL,
5460 "features");
5461 if (ret) {
5462 kfree(ef);
5463 goto out;
5464 }
5465
5466 ext4_feat = ef;
5467 ret = 0;
5468out:
5469 return ret;
5470}
5471
8f021222
LC		 5472static void ext4_exit_feat_adverts(void)
5473{
5474 kobject_put(&ext4_feat->f_kobj);
5475 wait_for_completion(&ext4_feat->f_kobj_unregister);
5476 kfree(ext4_feat);
5477}
5478
e9e3bcec
ES		 5479/* Shared across all ext4 file systems */
5480wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
5481struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ];
5482
5dabfc78 5483static int __init ext4_init_fs(void)
ac27a0ec 5484{
e9e3bcec 5485 int i, err;
c9de560d 5486
07c0c5d8
AV		 5487 ext4_li_info = NULL;
5488 mutex_init(&ext4_li_mtx);
5489
9a4c8019 5490 /* Build-time check for flags consistency */
12e9b892 5491 ext4_check_flag_values();
e9e3bcec
ES		 5492
5493 for (i = 0; i < EXT4_WQ_HASH_SZ; i++) {
5494 mutex_init(&ext4__aio_mutex[i]);
5495 init_waitqueue_head(&ext4__ioend_wq[i]);
5496 }
5497
51865fda 5498 err = ext4_init_es();
6fd058f7
TT		 5499 if (err)
5500 return err;
51865fda
ZL		 5501
5502 err = ext4_init_pageio();
5503 if (err)
5504 goto out7;
5505
5dabfc78 5506 err = ext4_init_system_zone();
bd2d0210 5507 if (err)
d44651d0 5508 goto out6;
3197ebdb 5509 ext4_kset = kset_create_and_add("ext4", NULL, fs_kobj);
0e376b1e
TT		 5510 if (!ext4_kset) {
5511 err = -ENOMEM;
dd68314c 5512 goto out5;
0e376b1e 5513 }
d44651d0 5514 ext4_proc_root = proc_mkdir("fs/ext4", NULL);
857ac889
LC		 5515
5516 err = ext4_init_feat_adverts();
dd68314c
TT		 5517 if (err)
5518 goto out4;
857ac889 5519
5dabfc78 5520 err = ext4_init_mballoc();
ac27a0ec 5521 if (err)
6fd058f7 5522 goto out3;
c9de560d 5523
5dabfc78 5524 err = ext4_init_xattr();
c9de560d
AT		 5525 if (err)
5526 goto out2;
ac27a0ec
DK		 5527 err = init_inodecache();
5528 if (err)
5529 goto out1;
24b58424 5530 register_as_ext3();
2035e776 5531 register_as_ext2();
03010a33 5532 err = register_filesystem(&ext4_fs_type);
ac27a0ec
DK		 5533 if (err)
5534 goto out;
bfff6873 5535
ac27a0ec
DK		 5536 return 0;
5537out:
24b58424
TT		 5538 unregister_as_ext2();
5539 unregister_as_ext3();
ac27a0ec
DK		 5540 destroy_inodecache();
5541out1:
5dabfc78 5542 ext4_exit_xattr();
c9de560d 5543out2:
5dabfc78 5544 ext4_exit_mballoc();
6fd058f7 5545out3:
8f021222 5546 ext4_exit_feat_adverts();
dd68314c 5547out4:
d44651d0
FJ		 5548 if (ext4_proc_root)
5549 remove_proc_entry("fs/ext4", NULL);
6fd058f7 5550 kset_unregister(ext4_kset);
d44651d0 5551out5:
5dabfc78 5552 ext4_exit_system_zone();
d44651d0 5553out6:
5dabfc78 5554 ext4_exit_pageio();
51865fda
ZL		 5555out7:
5556 ext4_exit_es();
5557
ac27a0ec
DK		 5558 return err;
5559}
5560
5dabfc78 5561static void __exit ext4_exit_fs(void)
ac27a0ec 5562{
bfff6873 5563 ext4_destroy_lazyinit_thread();
24b58424
TT		 5564 unregister_as_ext2();
5565 unregister_as_ext3();
03010a33 5566 unregister_filesystem(&ext4_fs_type);
ac27a0ec 5567 destroy_inodecache();
5dabfc78
TT		 5568 ext4_exit_xattr();
5569 ext4_exit_mballoc();
8f021222 5570 ext4_exit_feat_adverts();
9f6200bb 5571 remove_proc_entry("fs/ext4", NULL);
3197ebdb 5572 kset_unregister(ext4_kset);
5dabfc78
TT		 5573 ext4_exit_system_zone();
5574 ext4_exit_pageio();
dd12ed14 5575 ext4_exit_es();
ac27a0ec
DK		 5576}
5577
5578MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
83982b6f 5579MODULE_DESCRIPTION("Fourth Extended Filesystem");
ac27a0ec 5580MODULE_LICENSE("GPL");
5dabfc78
TT		 5581module_init(ext4_init_fs)
5582module_exit(ext4_exit_fs)
Ubuntu Artful kernel mirror