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ext4: fold ext4_sync_fs_nojournal() into ext4_sync_fs()
[GitHub/LineageOS/android_kernel_motorola_exynos9610.git] / fs / ext4 / super.c
CommitLineData
ac27a0ec 1/*
617ba13b 2 * linux/fs/ext4/super.c
ac27a0ec
DK		 3 *
4 * Copyright (C) 1992, 1993, 1994, 1995
5 * Remy Card (card@masi.ibp.fr)
6 * Laboratoire MASI - Institut Blaise Pascal
7 * Universite Pierre et Marie Curie (Paris VI)
8 *
9 * from
10 *
11 * linux/fs/minix/inode.c
12 *
13 * Copyright (C) 1991, 1992 Linus Torvalds
14 *
15 * Big-endian to little-endian byte-swapping/bitmaps by
16 * David S. Miller (davem@caip.rutgers.edu), 1995
17 */
18
19#include <linux/module.h>
20#include <linux/string.h>
21#include <linux/fs.h>
22#include <linux/time.h>
c5ca7c76 23#include <linux/vmalloc.h>
dab291af 24#include <linux/jbd2.h>
ac27a0ec
DK		 25#include <linux/slab.h>
26#include <linux/init.h>
27#include <linux/blkdev.h>
28#include <linux/parser.h>
ac27a0ec 29#include <linux/buffer_head.h>
a5694255 30#include <linux/exportfs.h>
ac27a0ec
DK		 31#include <linux/vfs.h>
32#include <linux/random.h>
33#include <linux/mount.h>
34#include <linux/namei.h>
35#include <linux/quotaops.h>
36#include <linux/seq_file.h>
9f6200bb 37#include <linux/proc_fs.h>
3197ebdb 38#include <linux/ctype.h>
1330593e 39#include <linux/log2.h>
717d50e4 40#include <linux/crc16.h>
7abc52c2 41#include <linux/cleancache.h>
ac27a0ec
DK		 42#include <asm/uaccess.h>
43
bfff6873
LC		 44#include <linux/kthread.h>
45#include <linux/freezer.h>
46
3dcf5451 47#include "ext4.h"
4a092d73 48#include "ext4_extents.h" /* Needed for trace points definition */
3dcf5451 49#include "ext4_jbd2.h"
ac27a0ec
DK		 50#include "xattr.h"
51#include "acl.h"
3661d286 52#include "mballoc.h"
ac27a0ec 53
9bffad1e
TT		 54#define CREATE_TRACE_POINTS
55#include <trace/events/ext4.h>
56
1f109d5a 57static struct proc_dir_entry *ext4_proc_root;
3197ebdb 58static struct kset *ext4_kset;
0b75a840
LC		 59static struct ext4_lazy_init *ext4_li_info;
60static struct mutex ext4_li_mtx;
61static struct ext4_features *ext4_feat;
9c191f70 62static int ext4_mballoc_ready;
9f6200bb 63
617ba13b 64static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
ac27a0ec 65 unsigned long journal_devnum);
2adf6da8 66static int ext4_show_options(struct seq_file *seq, struct dentry *root);
e2d67052 67static int ext4_commit_super(struct super_block *sb, int sync);
2b2d6d01
TT		 68static void ext4_mark_recovery_complete(struct super_block *sb,
69 struct ext4_super_block *es);
70static void ext4_clear_journal_err(struct super_block *sb,
71 struct ext4_super_block *es);
617ba13b 72static int ext4_sync_fs(struct super_block *sb, int wait);
2b2d6d01
TT		 73static int ext4_remount(struct super_block *sb, int *flags, char *data);
74static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
c4be0c1d 75static int ext4_unfreeze(struct super_block *sb);
c4be0c1d 76static int ext4_freeze(struct super_block *sb);
152a0836
AV		 77static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
78 const char *dev_name, void *data);
2035e776
TT		 79static inline int ext2_feature_set_ok(struct super_block *sb);
80static inline int ext3_feature_set_ok(struct super_block *sb);
d39195c3 81static int ext4_feature_set_ok(struct super_block *sb, int readonly);
bfff6873
LC		 82static void ext4_destroy_lazyinit_thread(void);
83static void ext4_unregister_li_request(struct super_block *sb);
8f1f7453 84static void ext4_clear_request_list(void);
27dd4385 85static int ext4_reserve_clusters(struct ext4_sb_info *, ext4_fsblk_t);
ac27a0ec 86
2035e776
TT		 87#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
88static struct file_system_type ext2_fs_type = {
89 .owner = THIS_MODULE,
90 .name = "ext2",
91 .mount = ext4_mount,
92 .kill_sb = kill_block_super,
93 .fs_flags = FS_REQUIRES_DEV,
94};
7f78e035 95MODULE_ALIAS_FS("ext2");
fa7614dd 96MODULE_ALIAS("ext2");
2035e776
TT		 97#define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type)
98#else
99#define IS_EXT2_SB(sb) (0)
100#endif
101
102
ba69f9ab
JK		 103#if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
104static struct file_system_type ext3_fs_type = {
105 .owner = THIS_MODULE,
106 .name = "ext3",
152a0836 107 .mount = ext4_mount,
ba69f9ab
JK		 108 .kill_sb = kill_block_super,
109 .fs_flags = FS_REQUIRES_DEV,
110};
7f78e035 111MODULE_ALIAS_FS("ext3");
fa7614dd 112MODULE_ALIAS("ext3");
ba69f9ab
JK		 113#define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type)
114#else
115#define IS_EXT3_SB(sb) (0)
116#endif
bd81d8ee 117
d25425f8
DW		 118static int ext4_verify_csum_type(struct super_block *sb,
119 struct ext4_super_block *es)
120{
121 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
122 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
123 return 1;
124
125 return es->s_checksum_type == EXT4_CRC32C_CHKSUM;
126}
127
a9c47317
DW		 128static __le32 ext4_superblock_csum(struct super_block *sb,
129 struct ext4_super_block *es)
130{
131 struct ext4_sb_info *sbi = EXT4_SB(sb);
132 int offset = offsetof(struct ext4_super_block, s_checksum);
133 __u32 csum;
134
135 csum = ext4_chksum(sbi, ~0, (char *)es, offset);
136
137 return cpu_to_le32(csum);
138}
139
c197855e
SH		 140static int ext4_superblock_csum_verify(struct super_block *sb,
141 struct ext4_super_block *es)
a9c47317
DW		 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);
ac27a0ec
DK		 822 brelse(sbi->s_sbh);
823#ifdef CONFIG_QUOTA
a2d4a646 824 for (i = 0; i < EXT4_MAXQUOTAS; i++)
ac27a0ec
DK		 825 kfree(sbi->s_qf_names[i]);
826#endif
827
828 /* Debugging code just in case the in-memory inode orphan list
829 * isn't empty. The on-disk one can be non-empty if we've
830 * detected an error and taken the fs readonly, but the
831 * in-memory list had better be clean by this point. */
832 if (!list_empty(&sbi->s_orphan))
833 dump_orphan_list(sb, sbi);
834 J_ASSERT(list_empty(&sbi->s_orphan));
835
f98393a6 836 invalidate_bdev(sb->s_bdev);
ac27a0ec
DK		 837 if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
838 /*
839 * Invalidate the journal device's buffers. We don't want them
840 * floating about in memory - the physical journal device may
841 * hotswapped, and it breaks the `ro-after' testing code.
842 */
843 sync_blockdev(sbi->journal_bdev);
f98393a6 844 invalidate_bdev(sbi->journal_bdev);
617ba13b 845 ext4_blkdev_remove(sbi);
ac27a0ec 846 }
9c191f70
M		 847 if (sbi->s_mb_cache) {
848 ext4_xattr_destroy_cache(sbi->s_mb_cache);
849 sbi->s_mb_cache = NULL;
850 }
c5e06d10
JL		 851 if (sbi->s_mmp_tsk)
852 kthread_stop(sbi->s_mmp_tsk);
ac27a0ec 853 sb->s_fs_info = NULL;
3197ebdb
TT		 854 /*
855 * Now that we are completely done shutting down the
856 * superblock, we need to actually destroy the kobject.
857 */
3197ebdb
TT		 858 kobject_put(&sbi->s_kobj);
859 wait_for_completion(&sbi->s_kobj_unregister);
0441984a
DW		 860 if (sbi->s_chksum_driver)
861 crypto_free_shash(sbi->s_chksum_driver);
705895b6 862 kfree(sbi->s_blockgroup_lock);
ac27a0ec 863 kfree(sbi);
ac27a0ec
DK		 864}
865
e18b890b 866static struct kmem_cache *ext4_inode_cachep;
ac27a0ec
DK		 867
868/*
869 * Called inside transaction, so use GFP_NOFS
870 */
617ba13b 871static struct inode *ext4_alloc_inode(struct super_block *sb)
ac27a0ec 872{
617ba13b 873 struct ext4_inode_info *ei;
ac27a0ec 874
e6b4f8da 875 ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
ac27a0ec
DK		 876 if (!ei)
877 return NULL;
0b8e58a1 878
ac27a0ec 879 ei->vfs_inode.i_version = 1;
202ee5df 880 spin_lock_init(&ei->i_raw_lock);
c9de560d
AT		 881 INIT_LIST_HEAD(&ei->i_prealloc_list);
882 spin_lock_init(&ei->i_prealloc_lock);
9a26b661
ZL		 883 ext4_es_init_tree(&ei->i_es_tree);
884 rwlock_init(&ei->i_es_lock);
74cd15cd 885 INIT_LIST_HEAD(&ei->i_es_lru);
eb68d0e2 886 ei->i_es_all_nr = 0;
74cd15cd 887 ei->i_es_lru_nr = 0;
d3922a77 888 ei->i_touch_when = 0;
d2a17637
MC		 889 ei->i_reserved_data_blocks = 0;
890 ei->i_reserved_meta_blocks = 0;
891 ei->i_allocated_meta_blocks = 0;
9d0be502 892 ei->i_da_metadata_calc_len = 0;
7e731bc9 893 ei->i_da_metadata_calc_last_lblock = 0;
d2a17637 894 spin_lock_init(&(ei->i_block_reservation_lock));
a9e7f447
DM		 895#ifdef CONFIG_QUOTA
896 ei->i_reserved_quota = 0;
897#endif
8aefcd55 898 ei->jinode = NULL;
2e8fa54e 899 INIT_LIST_HEAD(&ei->i_rsv_conversion_list);
744692dc 900 spin_lock_init(&ei->i_completed_io_lock);
b436b9be
JK		 901 ei->i_sync_tid = 0;
902 ei->i_datasync_tid = 0;
f7ad6d2e 903 atomic_set(&ei->i_ioend_count, 0);
e27f41e1 904 atomic_set(&ei->i_unwritten, 0);
2e8fa54e 905 INIT_WORK(&ei->i_rsv_conversion_work, ext4_end_io_rsv_work);
0b8e58a1 906
ac27a0ec
DK		 907 return &ei->vfs_inode;
908}
909
7ff9c073
TT		 910static int ext4_drop_inode(struct inode *inode)
911{
912 int drop = generic_drop_inode(inode);
913
914 trace_ext4_drop_inode(inode, drop);
915 return drop;
916}
917
fa0d7e3d
NP		 918static void ext4_i_callback(struct rcu_head *head)
919{
920 struct inode *inode = container_of(head, struct inode, i_rcu);
fa0d7e3d
NP		 921 kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
922}
923
617ba13b 924static void ext4_destroy_inode(struct inode *inode)
ac27a0ec 925{
9f7dd93d 926 if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
b31e1552
ES		 927 ext4_msg(inode->i_sb, KERN_ERR,
928 "Inode %lu (%p): orphan list check failed!",
929 inode->i_ino, EXT4_I(inode));
9f7dd93d
VA		 930 print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
931 EXT4_I(inode), sizeof(struct ext4_inode_info),
932 true);
933 dump_stack();
934 }
fa0d7e3d 935 call_rcu(&inode->i_rcu, ext4_i_callback);
ac27a0ec
DK		 936}
937
51cc5068 938static void init_once(void *foo)
ac27a0ec 939{
617ba13b 940 struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
ac27a0ec 941
a35afb83 942 INIT_LIST_HEAD(&ei->i_orphan);
a35afb83 943 init_rwsem(&ei->xattr_sem);
0e855ac8 944 init_rwsem(&ei->i_data_sem);
a35afb83 945 inode_init_once(&ei->vfs_inode);
ac27a0ec
DK		 946}
947
e67bc2b3 948static int __init init_inodecache(void)
ac27a0ec 949{
617ba13b
MC		 950 ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
951 sizeof(struct ext4_inode_info),
ac27a0ec
DK		 952 0, (SLAB_RECLAIM_ACCOUNT|
953 SLAB_MEM_SPREAD),
20c2df83 954 init_once);
617ba13b 955 if (ext4_inode_cachep == NULL)
ac27a0ec
DK		 956 return -ENOMEM;
957 return 0;
958}
959
960static void destroy_inodecache(void)
961{
8c0a8537
KS		 962 /*
963 * Make sure all delayed rcu free inodes are flushed before we
964 * destroy cache.
965 */
966 rcu_barrier();
617ba13b 967 kmem_cache_destroy(ext4_inode_cachep);
ac27a0ec
DK		 968}
969
0930fcc1 970void ext4_clear_inode(struct inode *inode)
ac27a0ec 971{
0930fcc1 972 invalidate_inode_buffers(inode);
dbd5768f 973 clear_inode(inode);
9f754758 974 dquot_drop(inode);
c2ea3fde 975 ext4_discard_preallocations(inode);
51865fda 976 ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS);
74cd15cd 977 ext4_es_lru_del(inode);
8aefcd55
TT		 978 if (EXT4_I(inode)->jinode) {
979 jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode),
980 EXT4_I(inode)->jinode);
981 jbd2_free_inode(EXT4_I(inode)->jinode);
982 EXT4_I(inode)->jinode = NULL;
983 }
ac27a0ec
DK		 984}
985
1b961ac0 986static struct inode *ext4_nfs_get_inode(struct super_block *sb,
0b8e58a1 987 u64 ino, u32 generation)
ac27a0ec 988{
ac27a0ec 989 struct inode *inode;
ac27a0ec 990
617ba13b 991 if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
ac27a0ec 992 return ERR_PTR(-ESTALE);
617ba13b 993 if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
ac27a0ec
DK		 994 return ERR_PTR(-ESTALE);
995
996 /* iget isn't really right if the inode is currently unallocated!!
997 *
617ba13b 998 * ext4_read_inode will return a bad_inode if the inode had been
ac27a0ec
DK		 999 * deleted, so we should be safe.
1000 *
1001 * Currently we don't know the generation for parent directory, so
1002 * a generation of 0 means "accept any"
1003 */
1d1fe1ee
DH		 1004 inode = ext4_iget(sb, ino);
1005 if (IS_ERR(inode))
1006 return ERR_CAST(inode);
1007 if (generation && inode->i_generation != generation) {
ac27a0ec
DK		 1008 iput(inode);
1009 return ERR_PTR(-ESTALE);
1010 }
1b961ac0
CH		 1011
1012 return inode;
1013}
1014
1015static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
0b8e58a1 1016 int fh_len, int fh_type)
1b961ac0
CH		 1017{
1018 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
1019 ext4_nfs_get_inode);
1020}
1021
1022static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
0b8e58a1 1023 int fh_len, int fh_type)
1b961ac0
CH		 1024{
1025 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
1026 ext4_nfs_get_inode);
ac27a0ec
DK		 1027}
1028
c39a7f84
TO		 1029/*
1030 * Try to release metadata pages (indirect blocks, directories) which are
1031 * mapped via the block device. Since these pages could have journal heads
1032 * which would prevent try_to_free_buffers() from freeing them, we must use
1033 * jbd2 layer's try_to_free_buffers() function to release them.
1034 */
0b8e58a1
AD		 1035static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
1036 gfp_t wait)
c39a7f84
TO		 1037{
1038 journal_t *journal = EXT4_SB(sb)->s_journal;
1039
1040 WARN_ON(PageChecked(page));
1041 if (!page_has_buffers(page))
1042 return 0;
1043 if (journal)
1044 return jbd2_journal_try_to_free_buffers(journal, page,
1045 wait & ~__GFP_WAIT);
1046 return try_to_free_buffers(page);
1047}
1048
ac27a0ec 1049#ifdef CONFIG_QUOTA
af5bc92d 1050#define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
2b2d6d01 1051#define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
ac27a0ec 1052
617ba13b
MC		 1053static int ext4_write_dquot(struct dquot *dquot);
1054static int ext4_acquire_dquot(struct dquot *dquot);
1055static int ext4_release_dquot(struct dquot *dquot);
1056static int ext4_mark_dquot_dirty(struct dquot *dquot);
1057static int ext4_write_info(struct super_block *sb, int type);
6f28e087 1058static int ext4_quota_on(struct super_block *sb, int type, int format_id,
f00c9e44 1059 struct path *path);
7c319d32
AK		 1060static int ext4_quota_on_sysfile(struct super_block *sb, int type,
1061 int format_id);
ca0e05e4 1062static int ext4_quota_off(struct super_block *sb, int type);
7c319d32 1063static int ext4_quota_off_sysfile(struct super_block *sb, int type);
617ba13b
MC		 1064static int ext4_quota_on_mount(struct super_block *sb, int type);
1065static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec 1066 size_t len, loff_t off);
617ba13b 1067static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec 1068 const char *data, size_t len, loff_t off);
7c319d32
AK		 1069static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
1070 unsigned int flags);
1071static int ext4_enable_quotas(struct super_block *sb);
ac27a0ec 1072
61e225dc 1073static const struct dquot_operations ext4_quota_operations = {
60e58e0f 1074 .get_reserved_space = ext4_get_reserved_space,
617ba13b
MC		 1075 .write_dquot = ext4_write_dquot,
1076 .acquire_dquot = ext4_acquire_dquot,
1077 .release_dquot = ext4_release_dquot,
1078 .mark_dirty = ext4_mark_dquot_dirty,
a5b5ee32
JK		 1079 .write_info = ext4_write_info,
1080 .alloc_dquot = dquot_alloc,
1081 .destroy_dquot = dquot_destroy,
ac27a0ec
DK		 1082};
1083
0d54b217 1084static const struct quotactl_ops ext4_qctl_operations = {
617ba13b 1085 .quota_on = ext4_quota_on,
ca0e05e4 1086 .quota_off = ext4_quota_off,
287a8095
CH		 1087 .quota_sync = dquot_quota_sync,
1088 .get_info = dquot_get_dqinfo,
1089 .set_info = dquot_set_dqinfo,
1090 .get_dqblk = dquot_get_dqblk,
1091 .set_dqblk = dquot_set_dqblk
ac27a0ec 1092};
7c319d32
AK		 1093
1094static const struct quotactl_ops ext4_qctl_sysfile_operations = {
1095 .quota_on_meta = ext4_quota_on_sysfile,
1096 .quota_off = ext4_quota_off_sysfile,
1097 .quota_sync = dquot_quota_sync,
1098 .get_info = dquot_get_dqinfo,
1099 .set_info = dquot_set_dqinfo,
1100 .get_dqblk = dquot_get_dqblk,
1101 .set_dqblk = dquot_set_dqblk
1102};
ac27a0ec
DK		 1103#endif
1104
ee9b6d61 1105static const struct super_operations ext4_sops = {
617ba13b
MC		 1106 .alloc_inode = ext4_alloc_inode,
1107 .destroy_inode = ext4_destroy_inode,
617ba13b
MC		 1108 .write_inode = ext4_write_inode,
1109 .dirty_inode = ext4_dirty_inode,
7ff9c073 1110 .drop_inode = ext4_drop_inode,
0930fcc1 1111 .evict_inode = ext4_evict_inode,
617ba13b 1112 .put_super = ext4_put_super,
617ba13b 1113 .sync_fs = ext4_sync_fs,
c4be0c1d
TS		 1114 .freeze_fs = ext4_freeze,
1115 .unfreeze_fs = ext4_unfreeze,
617ba13b
MC		 1116 .statfs = ext4_statfs,
1117 .remount_fs = ext4_remount,
617ba13b 1118 .show_options = ext4_show_options,
ac27a0ec 1119#ifdef CONFIG_QUOTA
617ba13b
MC		 1120 .quota_read = ext4_quota_read,
1121 .quota_write = ext4_quota_write,
ac27a0ec 1122#endif
c39a7f84 1123 .bdev_try_to_free_page = bdev_try_to_free_page,
ac27a0ec
DK		 1124};
1125
9ca92389
TT		 1126static const struct super_operations ext4_nojournal_sops = {
1127 .alloc_inode = ext4_alloc_inode,
1128 .destroy_inode = ext4_destroy_inode,
1129 .write_inode = ext4_write_inode,
1130 .dirty_inode = ext4_dirty_inode,
7ff9c073 1131 .drop_inode = ext4_drop_inode,
0930fcc1 1132 .evict_inode = ext4_evict_inode,
bda32530 1133 .sync_fs = ext4_sync_fs,
9ca92389
TT		 1134 .put_super = ext4_put_super,
1135 .statfs = ext4_statfs,
1136 .remount_fs = ext4_remount,
9ca92389
TT		 1137 .show_options = ext4_show_options,
1138#ifdef CONFIG_QUOTA
1139 .quota_read = ext4_quota_read,
1140 .quota_write = ext4_quota_write,
1141#endif
1142 .bdev_try_to_free_page = bdev_try_to_free_page,
1143};
1144
39655164 1145static const struct export_operations ext4_export_ops = {
1b961ac0
CH		 1146 .fh_to_dentry = ext4_fh_to_dentry,
1147 .fh_to_parent = ext4_fh_to_parent,
617ba13b 1148 .get_parent = ext4_get_parent,
ac27a0ec
DK		 1149};
1150
1151enum {
1152 Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
1153 Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
72578c33 1154 Opt_nouid32, Opt_debug, Opt_removed,
ac27a0ec 1155 Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
72578c33 1156 Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload,
ad4eec61
ES		 1157 Opt_commit, Opt_min_batch_time, Opt_max_batch_time, Opt_journal_dev,
1158 Opt_journal_path, Opt_journal_checksum, Opt_journal_async_commit,
ac27a0ec 1159 Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
296c355c 1160 Opt_data_err_abort, Opt_data_err_ignore,
ac27a0ec 1161 Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
5a20bdfc 1162 Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
ee4a3fcd 1163 Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err,
661aa520 1164 Opt_usrquota, Opt_grpquota, Opt_i_version,
1449032b
TT		 1165 Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_mblk_io_submit,
1166 Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity,
5328e635 1167 Opt_inode_readahead_blks, Opt_journal_ioprio,
744692dc 1168 Opt_dioread_nolock, Opt_dioread_lock,
fc6cb1cd 1169 Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable,
df981d03 1170 Opt_max_dir_size_kb,
ac27a0ec
DK		 1171};
1172
a447c093 1173static const match_table_t tokens = {
ac27a0ec
DK		 1174 {Opt_bsd_df, "bsddf"},
1175 {Opt_minix_df, "minixdf"},
1176 {Opt_grpid, "grpid"},
1177 {Opt_grpid, "bsdgroups"},
1178 {Opt_nogrpid, "nogrpid"},
1179 {Opt_nogrpid, "sysvgroups"},
1180 {Opt_resgid, "resgid=%u"},
1181 {Opt_resuid, "resuid=%u"},
1182 {Opt_sb, "sb=%u"},
1183 {Opt_err_cont, "errors=continue"},
1184 {Opt_err_panic, "errors=panic"},
1185 {Opt_err_ro, "errors=remount-ro"},
1186 {Opt_nouid32, "nouid32"},
ac27a0ec 1187 {Opt_debug, "debug"},
72578c33
TT		 1188 {Opt_removed, "oldalloc"},
1189 {Opt_removed, "orlov"},
ac27a0ec
DK		 1190 {Opt_user_xattr, "user_xattr"},
1191 {Opt_nouser_xattr, "nouser_xattr"},
1192 {Opt_acl, "acl"},
1193 {Opt_noacl, "noacl"},
e3bb52ae 1194 {Opt_noload, "norecovery"},
5a916be1 1195 {Opt_noload, "noload"},
72578c33
TT		 1196 {Opt_removed, "nobh"},
1197 {Opt_removed, "bh"},
ac27a0ec 1198 {Opt_commit, "commit=%u"},
30773840
TT		 1199 {Opt_min_batch_time, "min_batch_time=%u"},
1200 {Opt_max_batch_time, "max_batch_time=%u"},
ac27a0ec 1201 {Opt_journal_dev, "journal_dev=%u"},
ad4eec61 1202 {Opt_journal_path, "journal_path=%s"},
818d276c
GS		 1203 {Opt_journal_checksum, "journal_checksum"},
1204 {Opt_journal_async_commit, "journal_async_commit"},
ac27a0ec
DK		 1205 {Opt_abort, "abort"},
1206 {Opt_data_journal, "data=journal"},
1207 {Opt_data_ordered, "data=ordered"},
1208 {Opt_data_writeback, "data=writeback"},
5bf5683a
HK		 1209 {Opt_data_err_abort, "data_err=abort"},
1210 {Opt_data_err_ignore, "data_err=ignore"},
ac27a0ec
DK		 1211 {Opt_offusrjquota, "usrjquota="},
1212 {Opt_usrjquota, "usrjquota=%s"},
1213 {Opt_offgrpjquota, "grpjquota="},
1214 {Opt_grpjquota, "grpjquota=%s"},
1215 {Opt_jqfmt_vfsold, "jqfmt=vfsold"},
1216 {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
5a20bdfc 1217 {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
ac27a0ec
DK		 1218 {Opt_grpquota, "grpquota"},
1219 {Opt_noquota, "noquota"},
1220 {Opt_quota, "quota"},
1221 {Opt_usrquota, "usrquota"},
1222 {Opt_barrier, "barrier=%u"},
06705bff
TT		 1223 {Opt_barrier, "barrier"},
1224 {Opt_nobarrier, "nobarrier"},
25ec56b5 1225 {Opt_i_version, "i_version"},
c9de560d 1226 {Opt_stripe, "stripe=%u"},
64769240 1227 {Opt_delalloc, "delalloc"},
dd919b98 1228 {Opt_nodelalloc, "nodelalloc"},
36ade451
JK		 1229 {Opt_removed, "mblk_io_submit"},
1230 {Opt_removed, "nomblk_io_submit"},
6fd058f7
TT		 1231 {Opt_block_validity, "block_validity"},
1232 {Opt_noblock_validity, "noblock_validity"},
240799cd 1233 {Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
b3881f74 1234 {Opt_journal_ioprio, "journal_ioprio=%u"},
afd4672d 1235 {Opt_auto_da_alloc, "auto_da_alloc=%u"},
06705bff
TT		 1236 {Opt_auto_da_alloc, "auto_da_alloc"},
1237 {Opt_noauto_da_alloc, "noauto_da_alloc"},
744692dc
JZ		 1238 {Opt_dioread_nolock, "dioread_nolock"},
1239 {Opt_dioread_lock, "dioread_lock"},
5328e635
ES		 1240 {Opt_discard, "discard"},
1241 {Opt_nodiscard, "nodiscard"},
fc6cb1cd
TT		 1242 {Opt_init_itable, "init_itable=%u"},
1243 {Opt_init_itable, "init_itable"},
1244 {Opt_noinit_itable, "noinit_itable"},
df981d03 1245 {Opt_max_dir_size_kb, "max_dir_size_kb=%u"},
c7198b9c
TT		 1246 {Opt_removed, "check=none"}, /* mount option from ext2/3 */
1247 {Opt_removed, "nocheck"}, /* mount option from ext2/3 */
1248 {Opt_removed, "reservation"}, /* mount option from ext2/3 */
1249 {Opt_removed, "noreservation"}, /* mount option from ext2/3 */
1250 {Opt_removed, "journal=%u"}, /* mount option from ext2/3 */
f3f12faa 1251 {Opt_err, NULL},
ac27a0ec
DK		 1252};
1253
617ba13b 1254static ext4_fsblk_t get_sb_block(void **data)
ac27a0ec 1255{
617ba13b 1256 ext4_fsblk_t sb_block;
ac27a0ec
DK		 1257 char *options = (char *) *data;
1258
1259 if (!options || strncmp(options, "sb=", 3) != 0)
1260 return 1; /* Default location */
0b8e58a1 1261
ac27a0ec 1262 options += 3;
0b8e58a1 1263 /* TODO: use simple_strtoll with >32bit ext4 */
ac27a0ec
DK		 1264 sb_block = simple_strtoul(options, &options, 0);
1265 if (*options && *options != ',') {
4776004f 1266 printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
ac27a0ec
DK		 1267 (char *) *data);
1268 return 1;
1269 }
1270 if (*options == ',')
1271 options++;
1272 *data = (void *) options;
0b8e58a1 1273
ac27a0ec
DK		 1274 return sb_block;
1275}
1276
b3881f74 1277#define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
437ca0fd
DM		 1278static char deprecated_msg[] = "Mount option \"%s\" will be removed by %s\n"
1279 "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
b3881f74 1280
56c50f11
DM		 1281#ifdef CONFIG_QUOTA
1282static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
1283{
1284 struct ext4_sb_info *sbi = EXT4_SB(sb);
1285 char *qname;
03dafb5f 1286 int ret = -1;
56c50f11
DM		 1287
1288 if (sb_any_quota_loaded(sb) &&
1289 !sbi->s_qf_names[qtype]) {
1290 ext4_msg(sb, KERN_ERR,
1291 "Cannot change journaled "
1292 "quota options when quota turned on");
57f73c2c 1293 return -1;
56c50f11 1294 }
262b4662
JK		 1295 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA)) {
1296 ext4_msg(sb, KERN_ERR, "Cannot set journaled quota options "
1297 "when QUOTA feature is enabled");
1298 return -1;
1299 }
56c50f11
DM		 1300 qname = match_strdup(args);
1301 if (!qname) {
1302 ext4_msg(sb, KERN_ERR,
1303 "Not enough memory for storing quotafile name");
57f73c2c 1304 return -1;
56c50f11 1305 }
03dafb5f
CG		 1306 if (sbi->s_qf_names[qtype]) {
1307 if (strcmp(sbi->s_qf_names[qtype], qname) == 0)
1308 ret = 1;
1309 else
1310 ext4_msg(sb, KERN_ERR,
1311 "%s quota file already specified",
1312 QTYPE2NAME(qtype));
1313 goto errout;
56c50f11 1314 }
03dafb5f 1315 if (strchr(qname, '/')) {
56c50f11
DM		 1316 ext4_msg(sb, KERN_ERR,
1317 "quotafile must be on filesystem root");
03dafb5f 1318 goto errout;
56c50f11 1319 }
03dafb5f 1320 sbi->s_qf_names[qtype] = qname;
fd8c37ec 1321 set_opt(sb, QUOTA);
56c50f11 1322 return 1;
03dafb5f
CG		 1323errout:
1324 kfree(qname);
1325 return ret;
56c50f11
DM		 1326}
1327
1328static int clear_qf_name(struct super_block *sb, int qtype)
1329{
1330
1331 struct ext4_sb_info *sbi = EXT4_SB(sb);
1332
1333 if (sb_any_quota_loaded(sb) &&
1334 sbi->s_qf_names[qtype]) {
1335 ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options"
1336 " when quota turned on");
57f73c2c 1337 return -1;
56c50f11 1338 }
03dafb5f 1339 kfree(sbi->s_qf_names[qtype]);
56c50f11
DM		 1340 sbi->s_qf_names[qtype] = NULL;
1341 return 1;
1342}
1343#endif
1344
26092bf5
TT		 1345#define MOPT_SET 0x0001
1346#define MOPT_CLEAR 0x0002
1347#define MOPT_NOSUPPORT 0x0004
1348#define MOPT_EXPLICIT 0x0008
1349#define MOPT_CLEAR_ERR 0x0010
1350#define MOPT_GTE0 0x0020
ac27a0ec 1351#ifdef CONFIG_QUOTA
26092bf5
TT		 1352#define MOPT_Q 0
1353#define MOPT_QFMT 0x0040
1354#else
1355#define MOPT_Q MOPT_NOSUPPORT
1356#define MOPT_QFMT MOPT_NOSUPPORT
ac27a0ec 1357#endif
26092bf5 1358#define MOPT_DATAJ 0x0080
8dc0aa8c
TT		 1359#define MOPT_NO_EXT2 0x0100
1360#define MOPT_NO_EXT3 0x0200
1361#define MOPT_EXT4_ONLY (MOPT_NO_EXT2 | MOPT_NO_EXT3)
ad4eec61 1362#define MOPT_STRING 0x0400
26092bf5
TT		 1363
1364static const struct mount_opts {
1365 int token;
1366 int mount_opt;
1367 int flags;
1368} ext4_mount_opts[] = {
1369 {Opt_minix_df, EXT4_MOUNT_MINIX_DF, MOPT_SET},
1370 {Opt_bsd_df, EXT4_MOUNT_MINIX_DF, MOPT_CLEAR},
1371 {Opt_grpid, EXT4_MOUNT_GRPID, MOPT_SET},
1372 {Opt_nogrpid, EXT4_MOUNT_GRPID, MOPT_CLEAR},
26092bf5
TT		 1373 {Opt_block_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_SET},
1374 {Opt_noblock_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_CLEAR},
8dc0aa8c
TT		 1375 {Opt_dioread_nolock, EXT4_MOUNT_DIOREAD_NOLOCK,
1376 MOPT_EXT4_ONLY | MOPT_SET},
1377 {Opt_dioread_lock, EXT4_MOUNT_DIOREAD_NOLOCK,
1378 MOPT_EXT4_ONLY | MOPT_CLEAR},
26092bf5
TT		 1379 {Opt_discard, EXT4_MOUNT_DISCARD, MOPT_SET},
1380 {Opt_nodiscard, EXT4_MOUNT_DISCARD, MOPT_CLEAR},
8dc0aa8c
TT		 1381 {Opt_delalloc, EXT4_MOUNT_DELALLOC,
1382 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
1383 {Opt_nodelalloc, EXT4_MOUNT_DELALLOC,
59d9fa5c 1384 MOPT_EXT4_ONLY | MOPT_CLEAR},
8dc0aa8c
TT		 1385 {Opt_journal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
1386 MOPT_EXT4_ONLY | MOPT_SET},
26092bf5 1387 {Opt_journal_async_commit, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT |
8dc0aa8c
TT		 1388 EXT4_MOUNT_JOURNAL_CHECKSUM),
1389 MOPT_EXT4_ONLY | MOPT_SET},
1390 {Opt_noload, EXT4_MOUNT_NOLOAD, MOPT_NO_EXT2 | MOPT_SET},
26092bf5
TT		 1391 {Opt_err_panic, EXT4_MOUNT_ERRORS_PANIC, MOPT_SET | MOPT_CLEAR_ERR},
1392 {Opt_err_ro, EXT4_MOUNT_ERRORS_RO, MOPT_SET | MOPT_CLEAR_ERR},
1393 {Opt_err_cont, EXT4_MOUNT_ERRORS_CONT, MOPT_SET | MOPT_CLEAR_ERR},
8dc0aa8c
TT		 1394 {Opt_data_err_abort, EXT4_MOUNT_DATA_ERR_ABORT,
1395 MOPT_NO_EXT2 | MOPT_SET},
1396 {Opt_data_err_ignore, EXT4_MOUNT_DATA_ERR_ABORT,
1397 MOPT_NO_EXT2 | MOPT_CLEAR},
26092bf5
TT		 1398 {Opt_barrier, EXT4_MOUNT_BARRIER, MOPT_SET},
1399 {Opt_nobarrier, EXT4_MOUNT_BARRIER, MOPT_CLEAR},
1400 {Opt_noauto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_SET},
1401 {Opt_auto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_CLEAR},
1402 {Opt_noinit_itable, EXT4_MOUNT_INIT_INODE_TABLE, MOPT_CLEAR},
1403 {Opt_commit, 0, MOPT_GTE0},
1404 {Opt_max_batch_time, 0, MOPT_GTE0},
1405 {Opt_min_batch_time, 0, MOPT_GTE0},
1406 {Opt_inode_readahead_blks, 0, MOPT_GTE0},
1407 {Opt_init_itable, 0, MOPT_GTE0},
1408 {Opt_stripe, 0, MOPT_GTE0},
0efb3b23
JK		 1409 {Opt_resuid, 0, MOPT_GTE0},
1410 {Opt_resgid, 0, MOPT_GTE0},
1411 {Opt_journal_dev, 0, MOPT_GTE0},
ad4eec61 1412 {Opt_journal_path, 0, MOPT_STRING},
0efb3b23 1413 {Opt_journal_ioprio, 0, MOPT_GTE0},
8dc0aa8c
TT		 1414 {Opt_data_journal, EXT4_MOUNT_JOURNAL_DATA, MOPT_NO_EXT2 | MOPT_DATAJ},
1415 {Opt_data_ordered, EXT4_MOUNT_ORDERED_DATA, MOPT_NO_EXT2 | MOPT_DATAJ},
1416 {Opt_data_writeback, EXT4_MOUNT_WRITEBACK_DATA,
1417 MOPT_NO_EXT2 | MOPT_DATAJ},
26092bf5
TT		 1418 {Opt_user_xattr, EXT4_MOUNT_XATTR_USER, MOPT_SET},
1419 {Opt_nouser_xattr, EXT4_MOUNT_XATTR_USER, MOPT_CLEAR},
03010a33 1420#ifdef CONFIG_EXT4_FS_POSIX_ACL
26092bf5
TT		 1421 {Opt_acl, EXT4_MOUNT_POSIX_ACL, MOPT_SET},
1422 {Opt_noacl, EXT4_MOUNT_POSIX_ACL, MOPT_CLEAR},
ac27a0ec 1423#else
26092bf5
TT		 1424 {Opt_acl, 0, MOPT_NOSUPPORT},
1425 {Opt_noacl, 0, MOPT_NOSUPPORT},
ac27a0ec 1426#endif
26092bf5
TT		 1427 {Opt_nouid32, EXT4_MOUNT_NO_UID32, MOPT_SET},
1428 {Opt_debug, EXT4_MOUNT_DEBUG, MOPT_SET},
1429 {Opt_quota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA, MOPT_SET | MOPT_Q},
1430 {Opt_usrquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA,
1431 MOPT_SET | MOPT_Q},
1432 {Opt_grpquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_GRPQUOTA,
1433 MOPT_SET | MOPT_Q},
1434 {Opt_noquota, (EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA |
1435 EXT4_MOUNT_GRPQUOTA), MOPT_CLEAR | MOPT_Q},
1436 {Opt_usrjquota, 0, MOPT_Q},
1437 {Opt_grpjquota, 0, MOPT_Q},
1438 {Opt_offusrjquota, 0, MOPT_Q},
1439 {Opt_offgrpjquota, 0, MOPT_Q},
1440 {Opt_jqfmt_vfsold, QFMT_VFS_OLD, MOPT_QFMT},
1441 {Opt_jqfmt_vfsv0, QFMT_VFS_V0, MOPT_QFMT},
1442 {Opt_jqfmt_vfsv1, QFMT_VFS_V1, MOPT_QFMT},
df981d03 1443 {Opt_max_dir_size_kb, 0, MOPT_GTE0},
26092bf5
TT		 1444 {Opt_err, 0, 0}
1445};
1446
1447static int handle_mount_opt(struct super_block *sb, char *opt, int token,
1448 substring_t *args, unsigned long *journal_devnum,
1449 unsigned int *journal_ioprio, int is_remount)
1450{
1451 struct ext4_sb_info *sbi = EXT4_SB(sb);
1452 const struct mount_opts *m;
08cefc7a
EB		 1453 kuid_t uid;
1454 kgid_t gid;
26092bf5
TT		 1455 int arg = 0;
1456
57f73c2c
TT		 1457#ifdef CONFIG_QUOTA
1458 if (token == Opt_usrjquota)
1459 return set_qf_name(sb, USRQUOTA, &args[0]);
1460 else if (token == Opt_grpjquota)
1461 return set_qf_name(sb, GRPQUOTA, &args[0]);
1462 else if (token == Opt_offusrjquota)
1463 return clear_qf_name(sb, USRQUOTA);
1464 else if (token == Opt_offgrpjquota)
1465 return clear_qf_name(sb, GRPQUOTA);
1466#endif
26092bf5 1467 switch (token) {
f7048605
TT		 1468 case Opt_noacl:
1469 case Opt_nouser_xattr:
1470 ext4_msg(sb, KERN_WARNING, deprecated_msg, opt, "3.5");
1471 break;
26092bf5
TT		 1472 case Opt_sb:
1473 return 1; /* handled by get_sb_block() */
1474 case Opt_removed:
5f3633e3 1475 ext4_msg(sb, KERN_WARNING, "Ignoring removed %s option", opt);
26092bf5 1476 return 1;
26092bf5
TT		 1477 case Opt_abort:
1478 sbi->s_mount_flags |= EXT4_MF_FS_ABORTED;
1479 return 1;
1480 case Opt_i_version:
1481 sb->s_flags |= MS_I_VERSION;
1482 return 1;
26092bf5
TT		 1483 }
1484
5f3633e3
JK		 1485 for (m = ext4_mount_opts; m->token != Opt_err; m++)
1486 if (token == m->token)
1487 break;
1488
1489 if (m->token == Opt_err) {
1490 ext4_msg(sb, KERN_ERR, "Unrecognized mount option \"%s\" "
1491 "or missing value", opt);
1492 return -1;
1493 }
1494
8dc0aa8c
TT		 1495 if ((m->flags & MOPT_NO_EXT2) && IS_EXT2_SB(sb)) {
1496 ext4_msg(sb, KERN_ERR,
1497 "Mount option \"%s\" incompatible with ext2", opt);
1498 return -1;
1499 }
1500 if ((m->flags & MOPT_NO_EXT3) && IS_EXT3_SB(sb)) {
1501 ext4_msg(sb, KERN_ERR,
1502 "Mount option \"%s\" incompatible with ext3", opt);
1503 return -1;
1504 }
1505
ad4eec61 1506 if (args->from && !(m->flags & MOPT_STRING) && match_int(args, &arg))
5f3633e3
JK		 1507 return -1;
1508 if (args->from && (m->flags & MOPT_GTE0) && (arg < 0))
1509 return -1;
1510 if (m->flags & MOPT_EXPLICIT)
1511 set_opt2(sb, EXPLICIT_DELALLOC);
1512 if (m->flags & MOPT_CLEAR_ERR)
1513 clear_opt(sb, ERRORS_MASK);
1514 if (token == Opt_noquota && sb_any_quota_loaded(sb)) {
1515 ext4_msg(sb, KERN_ERR, "Cannot change quota "
1516 "options when quota turned on");
1517 return -1;
1518 }
1519
1520 if (m->flags & MOPT_NOSUPPORT) {
1521 ext4_msg(sb, KERN_ERR, "%s option not supported", opt);
1522 } else if (token == Opt_commit) {
1523 if (arg == 0)
1524 arg = JBD2_DEFAULT_MAX_COMMIT_AGE;
1525 sbi->s_commit_interval = HZ * arg;
1526 } else if (token == Opt_max_batch_time) {
5f3633e3
JK		 1527 sbi->s_max_batch_time = arg;
1528 } else if (token == Opt_min_batch_time) {
1529 sbi->s_min_batch_time = arg;
1530 } else if (token == Opt_inode_readahead_blks) {
e33e60ea
JK		 1531 if (arg && (arg > (1 << 30) || !is_power_of_2(arg))) {
1532 ext4_msg(sb, KERN_ERR,
1533 "EXT4-fs: inode_readahead_blks must be "
1534 "0 or a power of 2 smaller than 2^31");
26092bf5 1535 return -1;
5f3633e3
JK		 1536 }
1537 sbi->s_inode_readahead_blks = arg;
1538 } else if (token == Opt_init_itable) {
1539 set_opt(sb, INIT_INODE_TABLE);
1540 if (!args->from)
1541 arg = EXT4_DEF_LI_WAIT_MULT;
1542 sbi->s_li_wait_mult = arg;
1543 } else if (token == Opt_max_dir_size_kb) {
1544 sbi->s_max_dir_size_kb = arg;
1545 } else if (token == Opt_stripe) {
1546 sbi->s_stripe = arg;
1547 } else if (token == Opt_resuid) {
1548 uid = make_kuid(current_user_ns(), arg);
1549 if (!uid_valid(uid)) {
1550 ext4_msg(sb, KERN_ERR, "Invalid uid value %d", arg);
26092bf5
TT		 1551 return -1;
1552 }
5f3633e3
JK		 1553 sbi->s_resuid = uid;
1554 } else if (token == Opt_resgid) {
1555 gid = make_kgid(current_user_ns(), arg);
1556 if (!gid_valid(gid)) {
1557 ext4_msg(sb, KERN_ERR, "Invalid gid value %d", arg);
1558 return -1;
1559 }
1560 sbi->s_resgid = gid;
1561 } else if (token == Opt_journal_dev) {
1562 if (is_remount) {
1563 ext4_msg(sb, KERN_ERR,
1564 "Cannot specify journal on remount");
1565 return -1;
1566 }
1567 *journal_devnum = arg;
ad4eec61
ES		 1568 } else if (token == Opt_journal_path) {
1569 char *journal_path;
1570 struct inode *journal_inode;
1571 struct path path;
1572 int error;
1573
1574 if (is_remount) {
1575 ext4_msg(sb, KERN_ERR,
1576 "Cannot specify journal on remount");
1577 return -1;
1578 }
1579 journal_path = match_strdup(&args[0]);
1580 if (!journal_path) {
1581 ext4_msg(sb, KERN_ERR, "error: could not dup "
1582 "journal device string");
1583 return -1;
1584 }
1585
1586 error = kern_path(journal_path, LOOKUP_FOLLOW, &path);
1587 if (error) {
1588 ext4_msg(sb, KERN_ERR, "error: could not find "
1589 "journal device path: error %d", error);
1590 kfree(journal_path);
1591 return -1;
1592 }
1593
1594 journal_inode = path.dentry->d_inode;
1595 if (!S_ISBLK(journal_inode->i_mode)) {
1596 ext4_msg(sb, KERN_ERR, "error: journal path %s "
1597 "is not a block device", journal_path);
1598 path_put(&path);
1599 kfree(journal_path);
1600 return -1;
1601 }
1602
1603 *journal_devnum = new_encode_dev(journal_inode->i_rdev);
1604 path_put(&path);
1605 kfree(journal_path);
5f3633e3
JK		 1606 } else if (token == Opt_journal_ioprio) {
1607 if (arg > 7) {
1608 ext4_msg(sb, KERN_ERR, "Invalid journal IO priority"
1609 " (must be 0-7)");
1610 return -1;
1611 }
1612 *journal_ioprio =
1613 IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, arg);
1614 } else if (m->flags & MOPT_DATAJ) {
1615 if (is_remount) {
1616 if (!sbi->s_journal)
1617 ext4_msg(sb, KERN_WARNING, "Remounting file system with no journal so ignoring journalled data option");
1618 else if (test_opt(sb, DATA_FLAGS) != m->mount_opt) {
0efb3b23 1619 ext4_msg(sb, KERN_ERR,
26092bf5 1620 "Cannot change data mode on remount");
26092bf5 1621 return -1;
ac27a0ec 1622 }
26092bf5 1623 } else {
5f3633e3
JK		 1624 clear_opt(sb, DATA_FLAGS);
1625 sbi->s_mount_opt |= m->mount_opt;
ac27a0ec 1626 }
5f3633e3
JK		 1627#ifdef CONFIG_QUOTA
1628 } else if (m->flags & MOPT_QFMT) {
1629 if (sb_any_quota_loaded(sb) &&
1630 sbi->s_jquota_fmt != m->mount_opt) {
1631 ext4_msg(sb, KERN_ERR, "Cannot change journaled "
1632 "quota options when quota turned on");
1633 return -1;
1634 }
262b4662
JK		 1635 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
1636 EXT4_FEATURE_RO_COMPAT_QUOTA)) {
1637 ext4_msg(sb, KERN_ERR,
1638 "Cannot set journaled quota options "
1639 "when QUOTA feature is enabled");
1640 return -1;
1641 }
5f3633e3
JK		 1642 sbi->s_jquota_fmt = m->mount_opt;
1643#endif
1644 } else {
1645 if (!args->from)
1646 arg = 1;
1647 if (m->flags & MOPT_CLEAR)
1648 arg = !arg;
1649 else if (unlikely(!(m->flags & MOPT_SET))) {
1650 ext4_msg(sb, KERN_WARNING,
1651 "buggy handling of option %s", opt);
1652 WARN_ON(1);
1653 return -1;
1654 }
1655 if (arg != 0)
1656 sbi->s_mount_opt |= m->mount_opt;
1657 else
1658 sbi->s_mount_opt &= ~m->mount_opt;
26092bf5 1659 }
5f3633e3 1660 return 1;
26092bf5
TT		 1661}
1662
1663static int parse_options(char *options, struct super_block *sb,
1664 unsigned long *journal_devnum,
1665 unsigned int *journal_ioprio,
1666 int is_remount)
1667{
1668 struct ext4_sb_info *sbi = EXT4_SB(sb);
1669 char *p;
1670 substring_t args[MAX_OPT_ARGS];
1671 int token;
1672
1673 if (!options)
1674 return 1;
1675
1676 while ((p = strsep(&options, ",")) != NULL) {
1677 if (!*p)
1678 continue;
1679 /*
1680 * Initialize args struct so we know whether arg was
1681 * found; some options take optional arguments.
1682 */
caecd0af 1683 args[0].to = args[0].from = NULL;
26092bf5
TT		 1684 token = match_token(p, tokens, args);
1685 if (handle_mount_opt(sb, p, token, args, journal_devnum,
1686 journal_ioprio, is_remount) < 0)
1687 return 0;
ac27a0ec
DK		 1688 }
1689#ifdef CONFIG_QUOTA
262b4662
JK		 1690 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) &&
1691 (test_opt(sb, USRQUOTA) || test_opt(sb, GRPQUOTA))) {
1692 ext4_msg(sb, KERN_ERR, "Cannot set quota options when QUOTA "
1693 "feature is enabled");
1694 return 0;
1695 }
ac27a0ec 1696 if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
482a7425 1697 if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
fd8c37ec 1698 clear_opt(sb, USRQUOTA);
ac27a0ec 1699
482a7425 1700 if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
fd8c37ec 1701 clear_opt(sb, GRPQUOTA);
ac27a0ec 1702
56c50f11 1703 if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
b31e1552
ES		 1704 ext4_msg(sb, KERN_ERR, "old and new quota "
1705 "format mixing");
ac27a0ec
DK		 1706 return 0;
1707 }
1708
1709 if (!sbi->s_jquota_fmt) {
b31e1552
ES		 1710 ext4_msg(sb, KERN_ERR, "journaled quota format "
1711 "not specified");
ac27a0ec
DK		 1712 return 0;
1713 }
ac27a0ec
DK		 1714 }
1715#endif
261cb20c
JK		 1716 if (test_opt(sb, DIOREAD_NOLOCK)) {
1717 int blocksize =
1718 BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);
1719
1720 if (blocksize < PAGE_CACHE_SIZE) {
1721 ext4_msg(sb, KERN_ERR, "can't mount with "
1722 "dioread_nolock if block size != PAGE_SIZE");
1723 return 0;
1724 }
1725 }
ac27a0ec
DK		 1726 return 1;
1727}
1728
2adf6da8
TT		 1729static inline void ext4_show_quota_options(struct seq_file *seq,
1730 struct super_block *sb)
1731{
1732#if defined(CONFIG_QUOTA)
1733 struct ext4_sb_info *sbi = EXT4_SB(sb);
1734
1735 if (sbi->s_jquota_fmt) {
1736 char *fmtname = "";
1737
1738 switch (sbi->s_jquota_fmt) {
1739 case QFMT_VFS_OLD:
1740 fmtname = "vfsold";
1741 break;
1742 case QFMT_VFS_V0:
1743 fmtname = "vfsv0";
1744 break;
1745 case QFMT_VFS_V1:
1746 fmtname = "vfsv1";
1747 break;
1748 }
1749 seq_printf(seq, ",jqfmt=%s", fmtname);
1750 }
1751
1752 if (sbi->s_qf_names[USRQUOTA])
1753 seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]);
1754
1755 if (sbi->s_qf_names[GRPQUOTA])
1756 seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]);
2adf6da8
TT		 1757#endif
1758}
1759
5a916be1
TT		 1760static const char *token2str(int token)
1761{
50df9fd5 1762 const struct match_token *t;
5a916be1
TT		 1763
1764 for (t = tokens; t->token != Opt_err; t++)
1765 if (t->token == token && !strchr(t->pattern, '='))
1766 break;
1767 return t->pattern;
1768}
1769
2adf6da8
TT		 1770/*
1771 * Show an option if
1772 * - it's set to a non-default value OR
1773 * - if the per-sb default is different from the global default
1774 */
66acdcf4
TT		 1775static int _ext4_show_options(struct seq_file *seq, struct super_block *sb,
1776 int nodefs)
2adf6da8 1777{
2adf6da8
TT		 1778 struct ext4_sb_info *sbi = EXT4_SB(sb);
1779 struct ext4_super_block *es = sbi->s_es;
66acdcf4 1780 int def_errors, def_mount_opt = nodefs ? 0 : sbi->s_def_mount_opt;
5a916be1 1781 const struct mount_opts *m;
66acdcf4 1782 char sep = nodefs ? '\n' : ',';
2adf6da8 1783
66acdcf4
TT		 1784#define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep)
1785#define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg)
2adf6da8
TT		 1786
1787 if (sbi->s_sb_block != 1)
5a916be1
TT		 1788 SEQ_OPTS_PRINT("sb=%llu", sbi->s_sb_block);
1789
1790 for (m = ext4_mount_opts; m->token != Opt_err; m++) {
1791 int want_set = m->flags & MOPT_SET;
1792 if (((m->flags & (MOPT_SET|MOPT_CLEAR)) == 0) ||
1793 (m->flags & MOPT_CLEAR_ERR))
1794 continue;
66acdcf4 1795 if (!(m->mount_opt & (sbi->s_mount_opt ^ def_mount_opt)))
5a916be1
TT		 1796 continue; /* skip if same as the default */
1797 if ((want_set &&
1798 (sbi->s_mount_opt & m->mount_opt) != m->mount_opt) ||
1799 (!want_set && (sbi->s_mount_opt & m->mount_opt)))
1800 continue; /* select Opt_noFoo vs Opt_Foo */
1801 SEQ_OPTS_PRINT("%s", token2str(m->token));
2adf6da8 1802 }
5a916be1 1803
08cefc7a 1804 if (nodefs || !uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT4_DEF_RESUID)) ||
5a916be1 1805 le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID)
08cefc7a
EB		 1806 SEQ_OPTS_PRINT("resuid=%u",
1807 from_kuid_munged(&init_user_ns, sbi->s_resuid));
1808 if (nodefs || !gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT4_DEF_RESGID)) ||
5a916be1 1809 le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID)
08cefc7a
EB		 1810 SEQ_OPTS_PRINT("resgid=%u",
1811 from_kgid_munged(&init_user_ns, sbi->s_resgid));
66acdcf4 1812 def_errors = nodefs ? -1 : le16_to_cpu(es->s_errors);
5a916be1
TT		 1813 if (test_opt(sb, ERRORS_RO) && def_errors != EXT4_ERRORS_RO)
1814 SEQ_OPTS_PUTS("errors=remount-ro");
2adf6da8 1815 if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
5a916be1 1816 SEQ_OPTS_PUTS("errors=continue");
2adf6da8 1817 if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
5a916be1 1818 SEQ_OPTS_PUTS("errors=panic");
66acdcf4 1819 if (nodefs || sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ)
5a916be1 1820 SEQ_OPTS_PRINT("commit=%lu", sbi->s_commit_interval / HZ);
66acdcf4 1821 if (nodefs || sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME)
5a916be1 1822 SEQ_OPTS_PRINT("min_batch_time=%u", sbi->s_min_batch_time);
66acdcf4 1823 if (nodefs || sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME)
5a916be1 1824 SEQ_OPTS_PRINT("max_batch_time=%u", sbi->s_max_batch_time);
2adf6da8 1825 if (sb->s_flags & MS_I_VERSION)
5a916be1 1826 SEQ_OPTS_PUTS("i_version");
66acdcf4 1827 if (nodefs || sbi->s_stripe)
5a916be1 1828 SEQ_OPTS_PRINT("stripe=%lu", sbi->s_stripe);
66acdcf4 1829 if (EXT4_MOUNT_DATA_FLAGS & (sbi->s_mount_opt ^ def_mount_opt)) {
5a916be1
TT		 1830 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
1831 SEQ_OPTS_PUTS("data=journal");
1832 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
1833 SEQ_OPTS_PUTS("data=ordered");
1834 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
1835 SEQ_OPTS_PUTS("data=writeback");
1836 }
66acdcf4
TT		 1837 if (nodefs ||
1838 sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
5a916be1
TT		 1839 SEQ_OPTS_PRINT("inode_readahead_blks=%u",
1840 sbi->s_inode_readahead_blks);
2adf6da8 1841
66acdcf4
TT		 1842 if (nodefs || (test_opt(sb, INIT_INODE_TABLE) &&
1843 (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT)))
5a916be1 1844 SEQ_OPTS_PRINT("init_itable=%u", sbi->s_li_wait_mult);
df981d03
TT		 1845 if (nodefs || sbi->s_max_dir_size_kb)
1846 SEQ_OPTS_PRINT("max_dir_size_kb=%u", sbi->s_max_dir_size_kb);
2adf6da8
TT		 1847
1848 ext4_show_quota_options(seq, sb);
2adf6da8
TT		 1849 return 0;
1850}
1851
66acdcf4
TT		 1852static int ext4_show_options(struct seq_file *seq, struct dentry *root)
1853{
1854 return _ext4_show_options(seq, root->d_sb, 0);
1855}
1856
1857static int options_seq_show(struct seq_file *seq, void *offset)
1858{
1859 struct super_block *sb = seq->private;
1860 int rc;
1861
1862 seq_puts(seq, (sb->s_flags & MS_RDONLY) ? "ro" : "rw");
1863 rc = _ext4_show_options(seq, sb, 1);
1864 seq_puts(seq, "\n");
1865 return rc;
1866}
1867
1868static int options_open_fs(struct inode *inode, struct file *file)
1869{
d9dda78b 1870 return single_open(file, options_seq_show, PDE_DATA(inode));
66acdcf4
TT		 1871}
1872
1873static const struct file_operations ext4_seq_options_fops = {
1874 .owner = THIS_MODULE,
1875 .open = options_open_fs,
1876 .read = seq_read,
1877 .llseek = seq_lseek,
1878 .release = single_release,
1879};
1880
617ba13b 1881static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
ac27a0ec
DK		 1882 int read_only)
1883{
617ba13b 1884 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec
DK		 1885 int res = 0;
1886
617ba13b 1887 if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
b31e1552
ES		 1888 ext4_msg(sb, KERN_ERR, "revision level too high, "
1889 "forcing read-only mode");
ac27a0ec
DK		 1890 res = MS_RDONLY;
1891 }
1892 if (read_only)
281b5995 1893 goto done;
617ba13b 1894 if (!(sbi->s_mount_state & EXT4_VALID_FS))
b31e1552
ES		 1895 ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
1896 "running e2fsck is recommended");
c8b459f4 1897 else if (sbi->s_mount_state & EXT4_ERROR_FS)
b31e1552
ES		 1898 ext4_msg(sb, KERN_WARNING,
1899 "warning: mounting fs with errors, "
1900 "running e2fsck is recommended");
ed3ce80a 1901 else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
ac27a0ec
DK		 1902 le16_to_cpu(es->s_mnt_count) >=
1903 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
b31e1552
ES		 1904 ext4_msg(sb, KERN_WARNING,
1905 "warning: maximal mount count reached, "
1906 "running e2fsck is recommended");
ac27a0ec
DK		 1907 else if (le32_to_cpu(es->s_checkinterval) &&
1908 (le32_to_cpu(es->s_lastcheck) +
1909 le32_to_cpu(es->s_checkinterval) <= get_seconds()))
b31e1552
ES		 1910 ext4_msg(sb, KERN_WARNING,
1911 "warning: checktime reached, "
1912 "running e2fsck is recommended");
0b8e58a1 1913 if (!sbi->s_journal)
0390131b 1914 es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
ac27a0ec 1915 if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
617ba13b 1916 es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
e8546d06 1917 le16_add_cpu(&es->s_mnt_count, 1);
ac27a0ec 1918 es->s_mtime = cpu_to_le32(get_seconds());
617ba13b 1919 ext4_update_dynamic_rev(sb);
0390131b
FM		 1920 if (sbi->s_journal)
1921 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
ac27a0ec 1922
e2d67052 1923 ext4_commit_super(sb, 1);
281b5995 1924done:
ac27a0ec 1925 if (test_opt(sb, DEBUG))
a9df9a49 1926 printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
a2595b8a 1927 "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
ac27a0ec
DK		 1928 sb->s_blocksize,
1929 sbi->s_groups_count,
617ba13b
MC		 1930 EXT4_BLOCKS_PER_GROUP(sb),
1931 EXT4_INODES_PER_GROUP(sb),
a2595b8a 1932 sbi->s_mount_opt, sbi->s_mount_opt2);
ac27a0ec 1933
7abc52c2 1934 cleancache_init_fs(sb);
ac27a0ec
DK		 1935 return res;
1936}
1937
117fff10
TT		 1938int ext4_alloc_flex_bg_array(struct super_block *sb, ext4_group_t ngroup)
1939{
1940 struct ext4_sb_info *sbi = EXT4_SB(sb);
1941 struct flex_groups *new_groups;
1942 int size;
1943
1944 if (!sbi->s_log_groups_per_flex)
1945 return 0;
1946
1947 size = ext4_flex_group(sbi, ngroup - 1) + 1;
1948 if (size <= sbi->s_flex_groups_allocated)
1949 return 0;
1950
1951 size = roundup_pow_of_two(size * sizeof(struct flex_groups));
1952 new_groups = ext4_kvzalloc(size, GFP_KERNEL);
1953 if (!new_groups) {
1954 ext4_msg(sb, KERN_ERR, "not enough memory for %d flex groups",
1955 size / (int) sizeof(struct flex_groups));
1956 return -ENOMEM;
1957 }
1958
1959 if (sbi->s_flex_groups) {
1960 memcpy(new_groups, sbi->s_flex_groups,
1961 (sbi->s_flex_groups_allocated *
1962 sizeof(struct flex_groups)));
1963 ext4_kvfree(sbi->s_flex_groups);
1964 }
1965 sbi->s_flex_groups = new_groups;
1966 sbi->s_flex_groups_allocated = size / sizeof(struct flex_groups);
1967 return 0;
1968}
1969
772cb7c8
JS		 1970static int ext4_fill_flex_info(struct super_block *sb)
1971{
1972 struct ext4_sb_info *sbi = EXT4_SB(sb);
1973 struct ext4_group_desc *gdp = NULL;
772cb7c8 1974 ext4_group_t flex_group;
117fff10 1975 int i, err;
772cb7c8 1976
503358ae 1977 sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
d50f2ab6 1978 if (sbi->s_log_groups_per_flex < 1 || sbi->s_log_groups_per_flex > 31) {
772cb7c8
JS		 1979 sbi->s_log_groups_per_flex = 0;
1980 return 1;
1981 }
1982
117fff10
TT		 1983 err = ext4_alloc_flex_bg_array(sb, sbi->s_groups_count);
1984 if (err)
9933fc0a 1985 goto failed;
772cb7c8 1986
772cb7c8 1987 for (i = 0; i < sbi->s_groups_count; i++) {
88b6edd1 1988 gdp = ext4_get_group_desc(sb, i, NULL);
772cb7c8
JS		 1989
1990 flex_group = ext4_flex_group(sbi, i);
7ad9bb65
TT		 1991 atomic_add(ext4_free_inodes_count(sb, gdp),
1992 &sbi->s_flex_groups[flex_group].free_inodes);
90ba983f
TT		 1993 atomic64_add(ext4_free_group_clusters(sb, gdp),
1994 &sbi->s_flex_groups[flex_group].free_clusters);
7ad9bb65
TT		 1995 atomic_add(ext4_used_dirs_count(sb, gdp),
1996 &sbi->s_flex_groups[flex_group].used_dirs);
772cb7c8
JS		 1997 }
1998
1999 return 1;
2000failed:
2001 return 0;
2002}
2003
feb0ab32
DW		 2004static __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
2005 struct ext4_group_desc *gdp)
717d50e4 2006{
feb0ab32 2007 int offset;
717d50e4 2008 __u16 crc = 0;
feb0ab32 2009 __le32 le_group = cpu_to_le32(block_group);
717d50e4 2010
feb0ab32
DW		 2011 if ((sbi->s_es->s_feature_ro_compat &
2012 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))) {
2013 /* Use new metadata_csum algorithm */
d6a77105 2014 __le16 save_csum;
feb0ab32
DW		 2015 __u32 csum32;
2016
d6a77105 2017 save_csum = gdp->bg_checksum;
feb0ab32
DW		 2018 gdp->bg_checksum = 0;
2019 csum32 = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&le_group,
2020 sizeof(le_group));
2021 csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp,
2022 sbi->s_desc_size);
d6a77105 2023 gdp->bg_checksum = save_csum;
feb0ab32
DW		 2024
2025 crc = csum32 & 0xFFFF;
2026 goto out;
717d50e4
AD		 2027 }
2028
feb0ab32
DW		 2029 /* old crc16 code */
2030 offset = offsetof(struct ext4_group_desc, bg_checksum);
2031
2032 crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
2033 crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
2034 crc = crc16(crc, (__u8 *)gdp, offset);
2035 offset += sizeof(gdp->bg_checksum); /* skip checksum */
2036 /* for checksum of struct ext4_group_desc do the rest...*/
2037 if ((sbi->s_es->s_feature_incompat &
2038 cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) &&
2039 offset < le16_to_cpu(sbi->s_es->s_desc_size))
2040 crc = crc16(crc, (__u8 *)gdp + offset,
2041 le16_to_cpu(sbi->s_es->s_desc_size) -
2042 offset);
2043
2044out:
717d50e4
AD		 2045 return cpu_to_le16(crc);
2046}
2047
feb0ab32 2048int ext4_group_desc_csum_verify(struct super_block *sb, __u32 block_group,
717d50e4
AD		 2049 struct ext4_group_desc *gdp)
2050{
feb0ab32
DW		 2051 if (ext4_has_group_desc_csum(sb) &&
2052 (gdp->bg_checksum != ext4_group_desc_csum(EXT4_SB(sb),
2053 block_group, gdp)))
717d50e4
AD		 2054 return 0;
2055
2056 return 1;
2057}
2058
feb0ab32
DW		 2059void ext4_group_desc_csum_set(struct super_block *sb, __u32 block_group,
2060 struct ext4_group_desc *gdp)
2061{
2062 if (!ext4_has_group_desc_csum(sb))
2063 return;
2064 gdp->bg_checksum = ext4_group_desc_csum(EXT4_SB(sb), block_group, gdp);
2065}
2066
ac27a0ec 2067/* Called at mount-time, super-block is locked */
bfff6873
LC		 2068static int ext4_check_descriptors(struct super_block *sb,
2069 ext4_group_t *first_not_zeroed)
ac27a0ec 2070{
617ba13b
MC		 2071 struct ext4_sb_info *sbi = EXT4_SB(sb);
2072 ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
2073 ext4_fsblk_t last_block;
bd81d8ee
LV		 2074 ext4_fsblk_t block_bitmap;
2075 ext4_fsblk_t inode_bitmap;
2076 ext4_fsblk_t inode_table;
ce421581 2077 int flexbg_flag = 0;
bfff6873 2078 ext4_group_t i, grp = sbi->s_groups_count;
ac27a0ec 2079
ce421581
JS		 2080 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
2081 flexbg_flag = 1;
2082
af5bc92d 2083 ext4_debug("Checking group descriptors");
ac27a0ec 2084
197cd65a
AM		 2085 for (i = 0; i < sbi->s_groups_count; i++) {
2086 struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);
2087
ce421581 2088 if (i == sbi->s_groups_count - 1 || flexbg_flag)
bd81d8ee 2089 last_block = ext4_blocks_count(sbi->s_es) - 1;
ac27a0ec
DK		 2090 else
2091 last_block = first_block +
617ba13b 2092 (EXT4_BLOCKS_PER_GROUP(sb) - 1);
ac27a0ec 2093
bfff6873
LC		 2094 if ((grp == sbi->s_groups_count) &&
2095 !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2096 grp = i;
2097
8fadc143 2098 block_bitmap = ext4_block_bitmap(sb, gdp);
2b2d6d01 2099 if (block_bitmap < first_block || block_bitmap > last_block) {
b31e1552 2100 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2101 "Block bitmap for group %u not in group "
b31e1552 2102 "(block %llu)!", i, block_bitmap);
ac27a0ec
DK		 2103 return 0;
2104 }
8fadc143 2105 inode_bitmap = ext4_inode_bitmap(sb, gdp);
2b2d6d01 2106 if (inode_bitmap < first_block || inode_bitmap > last_block) {
b31e1552 2107 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2108 "Inode bitmap for group %u not in group "
b31e1552 2109 "(block %llu)!", i, inode_bitmap);
ac27a0ec
DK		 2110 return 0;
2111 }
8fadc143 2112 inode_table = ext4_inode_table(sb, gdp);
bd81d8ee 2113 if (inode_table < first_block ||
2b2d6d01 2114 inode_table + sbi->s_itb_per_group - 1 > last_block) {
b31e1552 2115 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
a9df9a49 2116 "Inode table for group %u not in group "
b31e1552 2117 "(block %llu)!", i, inode_table);
ac27a0ec
DK		 2118 return 0;
2119 }
955ce5f5 2120 ext4_lock_group(sb, i);
feb0ab32 2121 if (!ext4_group_desc_csum_verify(sb, i, gdp)) {
b31e1552
ES		 2122 ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2123 "Checksum for group %u failed (%u!=%u)",
2124 i, le16_to_cpu(ext4_group_desc_csum(sbi, i,
2125 gdp)), le16_to_cpu(gdp->bg_checksum));
7ee1ec4c 2126 if (!(sb->s_flags & MS_RDONLY)) {
955ce5f5 2127 ext4_unlock_group(sb, i);
8a266467 2128 return 0;
7ee1ec4c 2129 }
717d50e4 2130 }
955ce5f5 2131 ext4_unlock_group(sb, i);
ce421581
JS		 2132 if (!flexbg_flag)
2133 first_block += EXT4_BLOCKS_PER_GROUP(sb);
ac27a0ec 2134 }
bfff6873
LC		 2135 if (NULL != first_not_zeroed)
2136 *first_not_zeroed = grp;
ac27a0ec
DK		 2137 return 1;
2138}
2139
617ba13b 2140/* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
ac27a0ec
DK		 2141 * the superblock) which were deleted from all directories, but held open by
2142 * a process at the time of a crash. We walk the list and try to delete these
2143 * inodes at recovery time (only with a read-write filesystem).
2144 *
2145 * In order to keep the orphan inode chain consistent during traversal (in
2146 * case of crash during recovery), we link each inode into the superblock
2147 * orphan list_head and handle it the same way as an inode deletion during
2148 * normal operation (which journals the operations for us).
2149 *
2150 * We only do an iget() and an iput() on each inode, which is very safe if we
2151 * accidentally point at an in-use or already deleted inode. The worst that
2152 * can happen in this case is that we get a "bit already cleared" message from
617ba13b 2153 * ext4_free_inode(). The only reason we would point at a wrong inode is if
ac27a0ec
DK		 2154 * e2fsck was run on this filesystem, and it must have already done the orphan
2155 * inode cleanup for us, so we can safely abort without any further action.
2156 */
2b2d6d01
TT		 2157static void ext4_orphan_cleanup(struct super_block *sb,
2158 struct ext4_super_block *es)
ac27a0ec
DK		 2159{
2160 unsigned int s_flags = sb->s_flags;
2161 int nr_orphans = 0, nr_truncates = 0;
2162#ifdef CONFIG_QUOTA
2163 int i;
2164#endif
2165 if (!es->s_last_orphan) {
2166 jbd_debug(4, "no orphan inodes to clean up\n");
2167 return;
2168 }
2169
a8f48a95 2170 if (bdev_read_only(sb->s_bdev)) {
b31e1552
ES		 2171 ext4_msg(sb, KERN_ERR, "write access "
2172 "unavailable, skipping orphan cleanup");
a8f48a95
ES		 2173 return;
2174 }
2175
d39195c3
AG		 2176 /* Check if feature set would not allow a r/w mount */
2177 if (!ext4_feature_set_ok(sb, 0)) {
2178 ext4_msg(sb, KERN_INFO, "Skipping orphan cleanup due to "
2179 "unknown ROCOMPAT features");
2180 return;
2181 }
2182
617ba13b 2183 if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
c25f9bc6
ES		 2184 /* don't clear list on RO mount w/ errors */
2185 if (es->s_last_orphan && !(s_flags & MS_RDONLY)) {
84474976 2186 ext4_msg(sb, KERN_INFO, "Errors on filesystem, "
ac27a0ec 2187 "clearing orphan list.\n");
c25f9bc6
ES		 2188 es->s_last_orphan = 0;
2189 }
ac27a0ec
DK		 2190 jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
2191 return;
2192 }
2193
2194 if (s_flags & MS_RDONLY) {
b31e1552 2195 ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
ac27a0ec
DK		 2196 sb->s_flags &= ~MS_RDONLY;
2197 }
2198#ifdef CONFIG_QUOTA
2199 /* Needed for iput() to work correctly and not trash data */
2200 sb->s_flags |= MS_ACTIVE;
2201 /* Turn on quotas so that they are updated correctly */
a2d4a646 2202 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
617ba13b
MC		 2203 if (EXT4_SB(sb)->s_qf_names[i]) {
2204 int ret = ext4_quota_on_mount(sb, i);
ac27a0ec 2205 if (ret < 0)
b31e1552
ES		 2206 ext4_msg(sb, KERN_ERR,
2207 "Cannot turn on journaled "
2208 "quota: error %d", ret);
ac27a0ec
DK		 2209 }
2210 }
2211#endif
2212
2213 while (es->s_last_orphan) {
2214 struct inode *inode;
2215
97bd42b9
JB		 2216 inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
2217 if (IS_ERR(inode)) {
ac27a0ec
DK		 2218 es->s_last_orphan = 0;
2219 break;
2220 }
2221
617ba13b 2222 list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
871a2931 2223 dquot_initialize(inode);
ac27a0ec 2224 if (inode->i_nlink) {
566370a2
PT		 2225 if (test_opt(sb, DEBUG))
2226 ext4_msg(sb, KERN_DEBUG,
2227 "%s: truncating inode %lu to %lld bytes",
2228 __func__, inode->i_ino, inode->i_size);
e5f8eab8 2229 jbd_debug(2, "truncating inode %lu to %lld bytes\n",
ac27a0ec 2230 inode->i_ino, inode->i_size);
721e3eba 2231 mutex_lock(&inode->i_mutex);
55f252c9 2232 truncate_inode_pages(inode->i_mapping, inode->i_size);
617ba13b 2233 ext4_truncate(inode);
721e3eba 2234 mutex_unlock(&inode->i_mutex);
ac27a0ec
DK		 2235 nr_truncates++;
2236 } else {
566370a2
PT		 2237 if (test_opt(sb, DEBUG))
2238 ext4_msg(sb, KERN_DEBUG,
2239 "%s: deleting unreferenced inode %lu",
2240 __func__, inode->i_ino);
ac27a0ec
DK		 2241 jbd_debug(2, "deleting unreferenced inode %lu\n",
2242 inode->i_ino);
2243 nr_orphans++;
2244 }
2245 iput(inode); /* The delete magic happens here! */
2246 }
2247
2b2d6d01 2248#define PLURAL(x) (x), ((x) == 1) ? "" : "s"
ac27a0ec
DK		 2249
2250 if (nr_orphans)
b31e1552
ES		 2251 ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
2252 PLURAL(nr_orphans));
ac27a0ec 2253 if (nr_truncates)
b31e1552
ES		 2254 ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
2255 PLURAL(nr_truncates));
ac27a0ec
DK		 2256#ifdef CONFIG_QUOTA
2257 /* Turn quotas off */
a2d4a646 2258 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
ac27a0ec 2259 if (sb_dqopt(sb)->files[i])
287a8095 2260 dquot_quota_off(sb, i);
ac27a0ec
DK		 2261 }
2262#endif
2263 sb->s_flags = s_flags; /* Restore MS_RDONLY status */
2264}
0b8e58a1 2265
cd2291a4
ES		 2266/*
2267 * Maximal extent format file size.
2268 * Resulting logical blkno at s_maxbytes must fit in our on-disk
2269 * extent format containers, within a sector_t, and within i_blocks
2270 * in the vfs. ext4 inode has 48 bits of i_block in fsblock units,
2271 * so that won't be a limiting factor.
2272 *
f17722f9
LC		 2273 * However there is other limiting factor. We do store extents in the form
2274 * of starting block and length, hence the resulting length of the extent
2275 * covering maximum file size must fit into on-disk format containers as
2276 * well. Given that length is always by 1 unit bigger than max unit (because
2277 * we count 0 as well) we have to lower the s_maxbytes by one fs block.
2278 *
cd2291a4
ES		 2279 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
2280 */
f287a1a5 2281static loff_t ext4_max_size(int blkbits, int has_huge_files)
cd2291a4
ES		 2282{
2283 loff_t res;
2284 loff_t upper_limit = MAX_LFS_FILESIZE;
2285
2286 /* small i_blocks in vfs inode? */
f287a1a5 2287 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
cd2291a4 2288 /*
90c699a9 2289 * CONFIG_LBDAF is not enabled implies the inode
cd2291a4
ES		 2290 * i_block represent total blocks in 512 bytes
2291 * 32 == size of vfs inode i_blocks * 8
2292 */
2293 upper_limit = (1LL << 32) - 1;
2294
2295 /* total blocks in file system block size */
2296 upper_limit >>= (blkbits - 9);
2297 upper_limit <<= blkbits;
2298 }
2299
f17722f9
LC		 2300 /*
2301 * 32-bit extent-start container, ee_block. We lower the maxbytes
2302 * by one fs block, so ee_len can cover the extent of maximum file
2303 * size
2304 */
2305 res = (1LL << 32) - 1;
cd2291a4 2306 res <<= blkbits;
cd2291a4
ES		 2307
2308 /* Sanity check against vm- & vfs- imposed limits */
2309 if (res > upper_limit)
2310 res = upper_limit;
2311
2312 return res;
2313}
ac27a0ec 2314
ac27a0ec 2315/*
cd2291a4 2316 * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect
0fc1b451
AK		 2317 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
2318 * We need to be 1 filesystem block less than the 2^48 sector limit.
ac27a0ec 2319 */
f287a1a5 2320static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
ac27a0ec 2321{
617ba13b 2322 loff_t res = EXT4_NDIR_BLOCKS;
0fc1b451
AK		 2323 int meta_blocks;
2324 loff_t upper_limit;
0b8e58a1
AD		 2325 /* This is calculated to be the largest file size for a dense, block
2326 * mapped file such that the file's total number of 512-byte sectors,
2327 * including data and all indirect blocks, does not exceed (2^48 - 1).
2328 *
2329 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
2330 * number of 512-byte sectors of the file.
0fc1b451
AK		 2331 */
2332
f287a1a5 2333 if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
0fc1b451 2334 /*
90c699a9 2335 * !has_huge_files or CONFIG_LBDAF not enabled implies that
0b8e58a1
AD		 2336 * the inode i_block field represents total file blocks in
2337 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
0fc1b451
AK		 2338 */
2339 upper_limit = (1LL << 32) - 1;
2340
2341 /* total blocks in file system block size */
2342 upper_limit >>= (bits - 9);
2343
2344 } else {
8180a562
AK		 2345 /*
2346 * We use 48 bit ext4_inode i_blocks
2347 * With EXT4_HUGE_FILE_FL set the i_blocks
2348 * represent total number of blocks in
2349 * file system block size
2350 */
0fc1b451
AK		 2351 upper_limit = (1LL << 48) - 1;
2352
0fc1b451
AK		 2353 }
2354
2355 /* indirect blocks */
2356 meta_blocks = 1;
2357 /* double indirect blocks */
2358 meta_blocks += 1 + (1LL << (bits-2));
2359 /* tripple indirect blocks */
2360 meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));
2361
2362 upper_limit -= meta_blocks;
2363 upper_limit <<= bits;
ac27a0ec
DK		 2364
2365 res += 1LL << (bits-2);
2366 res += 1LL << (2*(bits-2));
2367 res += 1LL << (3*(bits-2));
2368 res <<= bits;
2369 if (res > upper_limit)
2370 res = upper_limit;
0fc1b451
AK		 2371
2372 if (res > MAX_LFS_FILESIZE)
2373 res = MAX_LFS_FILESIZE;
2374
ac27a0ec
DK		 2375 return res;
2376}
2377
617ba13b 2378static ext4_fsblk_t descriptor_loc(struct super_block *sb,
0b8e58a1 2379 ext4_fsblk_t logical_sb_block, int nr)
ac27a0ec 2380{
617ba13b 2381 struct ext4_sb_info *sbi = EXT4_SB(sb);
fd2d4291 2382 ext4_group_t bg, first_meta_bg;
ac27a0ec
DK		 2383 int has_super = 0;
2384
2385 first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);
2386
617ba13b 2387 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) ||
ac27a0ec 2388 nr < first_meta_bg)
70bbb3e0 2389 return logical_sb_block + nr + 1;
ac27a0ec 2390 bg = sbi->s_desc_per_block * nr;
617ba13b 2391 if (ext4_bg_has_super(sb, bg))
ac27a0ec 2392 has_super = 1;
0b8e58a1 2393
bd63f6b0
DW		 2394 /*
2395 * If we have a meta_bg fs with 1k blocks, group 0's GDT is at
2396 * block 2, not 1. If s_first_data_block == 0 (bigalloc is enabled
2397 * on modern mke2fs or blksize > 1k on older mke2fs) then we must
2398 * compensate.
2399 */
2400 if (sb->s_blocksize == 1024 && nr == 0 &&
2401 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block) == 0)
2402 has_super++;
2403
617ba13b 2404 return (has_super + ext4_group_first_block_no(sb, bg));
ac27a0ec
DK		 2405}
2406
c9de560d
AT		 2407/**
2408 * ext4_get_stripe_size: Get the stripe size.
2409 * @sbi: In memory super block info
2410 *
2411 * If we have specified it via mount option, then
2412 * use the mount option value. If the value specified at mount time is
2413 * greater than the blocks per group use the super block value.
2414 * If the super block value is greater than blocks per group return 0.
2415 * Allocator needs it be less than blocks per group.
2416 *
2417 */
2418static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
2419{
2420 unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
2421 unsigned long stripe_width =
2422 le32_to_cpu(sbi->s_es->s_raid_stripe_width);
3eb08658 2423 int ret;
c9de560d
AT		 2424
2425 if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
3eb08658
DE		 2426 ret = sbi->s_stripe;
2427 else if (stripe_width <= sbi->s_blocks_per_group)
2428 ret = stripe_width;
2429 else if (stride <= sbi->s_blocks_per_group)
2430 ret = stride;
2431 else
2432 ret = 0;
c9de560d 2433
3eb08658
DE		 2434 /*
2435 * If the stripe width is 1, this makes no sense and
2436 * we set it to 0 to turn off stripe handling code.
2437 */
2438 if (ret <= 1)
2439 ret = 0;
c9de560d 2440
3eb08658 2441 return ret;
c9de560d 2442}
ac27a0ec 2443
3197ebdb
TT		 2444/* sysfs supprt */
2445
2446struct ext4_attr {
2447 struct attribute attr;
2448 ssize_t (*show)(struct ext4_attr *, struct ext4_sb_info *, char *);
60e6679e 2449 ssize_t (*store)(struct ext4_attr *, struct ext4_sb_info *,
3197ebdb 2450 const char *, size_t);
f2d50a65
JK		 2451 union {
2452 int offset;
2453 int deprecated_val;
2454 } u;
3197ebdb
TT		 2455};
2456
27dd4385
LC		 2457static int parse_strtoull(const char *buf,
2458 unsigned long long max, unsigned long long *value)
2459{
2460 int ret;
2461
2462 ret = kstrtoull(skip_spaces(buf), 0, value);
2463 if (!ret && *value > max)
2464 ret = -EINVAL;
2465 return ret;
2466}
2467
3197ebdb
TT		 2468static ssize_t delayed_allocation_blocks_show(struct ext4_attr *a,
2469 struct ext4_sb_info *sbi,
2470 char *buf)
2471{
2472 return snprintf(buf, PAGE_SIZE, "%llu\n",
7b415bf6
AK		 2473 (s64) EXT4_C2B(sbi,
2474 percpu_counter_sum(&sbi->s_dirtyclusters_counter)));
3197ebdb
TT		 2475}
2476
2477static ssize_t session_write_kbytes_show(struct ext4_attr *a,
2478 struct ext4_sb_info *sbi, char *buf)
2479{
2480 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2481
f613dfcb
TT		 2482 if (!sb->s_bdev->bd_part)
2483 return snprintf(buf, PAGE_SIZE, "0\n");
3197ebdb
TT		 2484 return snprintf(buf, PAGE_SIZE, "%lu\n",
2485 (part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
2486 sbi->s_sectors_written_start) >> 1);
2487}
2488
2489static ssize_t lifetime_write_kbytes_show(struct ext4_attr *a,
2490 struct ext4_sb_info *sbi, char *buf)
2491{
2492 struct super_block *sb = sbi->s_buddy_cache->i_sb;
2493
f613dfcb
TT		 2494 if (!sb->s_bdev->bd_part)
2495 return snprintf(buf, PAGE_SIZE, "0\n");
3197ebdb 2496 return snprintf(buf, PAGE_SIZE, "%llu\n",
a6b43e38 2497 (unsigned long long)(sbi->s_kbytes_written +
3197ebdb 2498 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
a6b43e38 2499 EXT4_SB(sb)->s_sectors_written_start) >> 1)));
3197ebdb
TT		 2500}
2501
2502static ssize_t inode_readahead_blks_store(struct ext4_attr *a,
2503 struct ext4_sb_info *sbi,
2504 const char *buf, size_t count)
2505{
2506 unsigned long t;
e1091b15 2507 int ret;
3197ebdb 2508
e1091b15
LC		 2509 ret = kstrtoul(skip_spaces(buf), 0, &t);
2510 if (ret)
2511 return ret;
3197ebdb 2512
e1091b15 2513 if (t && (!is_power_of_2(t) || t > 0x40000000))
3197ebdb
TT		 2514 return -EINVAL;
2515
2516 sbi->s_inode_readahead_blks = t;
2517 return count;
2518}
2519
2520static ssize_t sbi_ui_show(struct ext4_attr *a,
0b8e58a1 2521 struct ext4_sb_info *sbi, char *buf)
3197ebdb 2522{
f2d50a65 2523 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->u.offset);
3197ebdb
TT		 2524
2525 return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
2526}
2527
2528static ssize_t sbi_ui_store(struct ext4_attr *a,
2529 struct ext4_sb_info *sbi,
2530 const char *buf, size_t count)
2531{
f2d50a65 2532 unsigned int *ui = (unsigned int *) (((char *) sbi) + a->u.offset);
3197ebdb 2533 unsigned long t;
e1091b15 2534 int ret;
3197ebdb 2535
e1091b15
LC		 2536 ret = kstrtoul(skip_spaces(buf), 0, &t);
2537 if (ret)
2538 return ret;
3197ebdb
TT		 2539 *ui = t;
2540 return count;
2541}
2542
52c198c6
LC		 2543static ssize_t es_ui_show(struct ext4_attr *a,
2544 struct ext4_sb_info *sbi, char *buf)
2545{
2546
2547 unsigned int *ui = (unsigned int *) (((char *) sbi->s_es) +
2548 a->u.offset);
2549
2550 return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
2551}
2552
27dd4385
LC		 2553static ssize_t reserved_clusters_show(struct ext4_attr *a,
2554 struct ext4_sb_info *sbi, char *buf)
2555{
2556 return snprintf(buf, PAGE_SIZE, "%llu\n",
2557 (unsigned long long) atomic64_read(&sbi->s_resv_clusters));
2558}
2559
2560static ssize_t reserved_clusters_store(struct ext4_attr *a,
2561 struct ext4_sb_info *sbi,
2562 const char *buf, size_t count)
2563{
2564 unsigned long long val;
2565 int ret;
2566
2567 if (parse_strtoull(buf, -1ULL, &val))
2568 return -EINVAL;
2569 ret = ext4_reserve_clusters(sbi, val);
2570
2571 return ret ? ret : count;
2572}
2573
2c0544b2
TT		 2574static ssize_t trigger_test_error(struct ext4_attr *a,
2575 struct ext4_sb_info *sbi,
2576 const char *buf, size_t count)
2577{
2578 int len = count;
2579
2580 if (!capable(CAP_SYS_ADMIN))
2581 return -EPERM;
2582
2583 if (len && buf[len-1] == '\n')
2584 len--;
2585
2586 if (len)
2587 ext4_error(sbi->s_sb, "%.*s", len, buf);
2588 return count;
2589}
2590
f2d50a65
JK		 2591static ssize_t sbi_deprecated_show(struct ext4_attr *a,
2592 struct ext4_sb_info *sbi, char *buf)
2593{
2594 return snprintf(buf, PAGE_SIZE, "%d\n", a->u.deprecated_val);
2595}
2596
3197ebdb
TT		 2597#define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \
2598static struct ext4_attr ext4_attr_##_name = { \
2599 .attr = {.name = __stringify(_name), .mode = _mode }, \
2600 .show = _show, \
2601 .store = _store, \
f2d50a65
JK		 2602 .u = { \
2603 .offset = offsetof(struct ext4_sb_info, _elname),\
2604 }, \
3197ebdb 2605}
52c198c6
LC		 2606
2607#define EXT4_ATTR_OFFSET_ES(_name,_mode,_show,_store,_elname) \
2608static struct ext4_attr ext4_attr_##_name = { \
2609 .attr = {.name = __stringify(_name), .mode = _mode }, \
2610 .show = _show, \
2611 .store = _store, \
2612 .u = { \
2613 .offset = offsetof(struct ext4_super_block, _elname), \
2614 }, \
2615}
2616
3197ebdb
TT		 2617#define EXT4_ATTR(name, mode, show, store) \
2618static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store)
2619
857ac889 2620#define EXT4_INFO_ATTR(name) EXT4_ATTR(name, 0444, NULL, NULL)
3197ebdb
TT		 2621#define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL)
2622#define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store)
52c198c6
LC		 2623
2624#define EXT4_RO_ATTR_ES_UI(name, elname) \
2625 EXT4_ATTR_OFFSET_ES(name, 0444, es_ui_show, NULL, elname)
3197ebdb
TT		 2626#define EXT4_RW_ATTR_SBI_UI(name, elname) \
2627 EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname)
52c198c6 2628
3197ebdb 2629#define ATTR_LIST(name) &ext4_attr_##name.attr
f2d50a65
JK		 2630#define EXT4_DEPRECATED_ATTR(_name, _val) \
2631static struct ext4_attr ext4_attr_##_name = { \
2632 .attr = {.name = __stringify(_name), .mode = 0444 }, \
2633 .show = sbi_deprecated_show, \
2634 .u = { \
2635 .deprecated_val = _val, \
2636 }, \
2637}
3197ebdb
TT		 2638
2639EXT4_RO_ATTR(delayed_allocation_blocks);
2640EXT4_RO_ATTR(session_write_kbytes);
2641EXT4_RO_ATTR(lifetime_write_kbytes);
27dd4385 2642EXT4_RW_ATTR(reserved_clusters);
3197ebdb
TT		 2643EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, sbi_ui_show,
2644 inode_readahead_blks_store, s_inode_readahead_blks);
11013911 2645EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal);
3197ebdb
TT		 2646EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats);
2647EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan);
2648EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan);
2649EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs);
2650EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request);
2651EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc);
f2d50a65 2652EXT4_DEPRECATED_ATTR(max_writeback_mb_bump, 128);
67a5da56 2653EXT4_RW_ATTR_SBI_UI(extent_max_zeroout_kb, s_extent_max_zeroout_kb);
2c0544b2 2654EXT4_ATTR(trigger_fs_error, 0200, NULL, trigger_test_error);
efbed4dc
TT		 2655EXT4_RW_ATTR_SBI_UI(err_ratelimit_interval_ms, s_err_ratelimit_state.interval);
2656EXT4_RW_ATTR_SBI_UI(err_ratelimit_burst, s_err_ratelimit_state.burst);
2657EXT4_RW_ATTR_SBI_UI(warning_ratelimit_interval_ms, s_warning_ratelimit_state.interval);
2658EXT4_RW_ATTR_SBI_UI(warning_ratelimit_burst, s_warning_ratelimit_state.burst);
2659EXT4_RW_ATTR_SBI_UI(msg_ratelimit_interval_ms, s_msg_ratelimit_state.interval);
2660EXT4_RW_ATTR_SBI_UI(msg_ratelimit_burst, s_msg_ratelimit_state.burst);
52c198c6
LC		 2661EXT4_RO_ATTR_ES_UI(errors_count, s_error_count);
2662EXT4_RO_ATTR_ES_UI(first_error_time, s_first_error_time);
2663EXT4_RO_ATTR_ES_UI(last_error_time, s_last_error_time);
3197ebdb
TT		 2664
2665static struct attribute *ext4_attrs[] = {
2666 ATTR_LIST(delayed_allocation_blocks),
2667 ATTR_LIST(session_write_kbytes),
2668 ATTR_LIST(lifetime_write_kbytes),
27dd4385 2669 ATTR_LIST(reserved_clusters),
3197ebdb 2670 ATTR_LIST(inode_readahead_blks),
11013911 2671 ATTR_LIST(inode_goal),
3197ebdb
TT		 2672 ATTR_LIST(mb_stats),
2673 ATTR_LIST(mb_max_to_scan),
2674 ATTR_LIST(mb_min_to_scan),
2675 ATTR_LIST(mb_order2_req),
2676 ATTR_LIST(mb_stream_req),
2677 ATTR_LIST(mb_group_prealloc),
55138e0b 2678 ATTR_LIST(max_writeback_mb_bump),
67a5da56 2679 ATTR_LIST(extent_max_zeroout_kb),
2c0544b2 2680 ATTR_LIST(trigger_fs_error),
efbed4dc
TT		 2681 ATTR_LIST(err_ratelimit_interval_ms),
2682 ATTR_LIST(err_ratelimit_burst),
2683 ATTR_LIST(warning_ratelimit_interval_ms),
2684 ATTR_LIST(warning_ratelimit_burst),
2685 ATTR_LIST(msg_ratelimit_interval_ms),
2686 ATTR_LIST(msg_ratelimit_burst),
52c198c6
LC		 2687 ATTR_LIST(errors_count),
2688 ATTR_LIST(first_error_time),
2689 ATTR_LIST(last_error_time),
3197ebdb
TT		 2690 NULL,
2691};
2692
857ac889
LC		 2693/* Features this copy of ext4 supports */
2694EXT4_INFO_ATTR(lazy_itable_init);
27ee40df 2695EXT4_INFO_ATTR(batched_discard);
5e7bbef1 2696EXT4_INFO_ATTR(meta_bg_resize);
857ac889
LC		 2697
2698static struct attribute *ext4_feat_attrs[] = {
2699 ATTR_LIST(lazy_itable_init),
27ee40df 2700 ATTR_LIST(batched_discard),
5e7bbef1 2701 ATTR_LIST(meta_bg_resize),
857ac889
LC		 2702 NULL,
2703};
2704
3197ebdb
TT		 2705static ssize_t ext4_attr_show(struct kobject *kobj,
2706 struct attribute *attr, char *buf)
2707{
2708 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2709 s_kobj);
2710 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2711
2712 return a->show ? a->show(a, sbi, buf) : 0;
2713}
2714
2715static ssize_t ext4_attr_store(struct kobject *kobj,
2716 struct attribute *attr,
2717 const char *buf, size_t len)
2718{
2719 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2720 s_kobj);
2721 struct ext4_attr *a = container_of(attr, struct ext4_attr, attr);
2722
2723 return a->store ? a->store(a, sbi, buf, len) : 0;
2724}
2725
2726static void ext4_sb_release(struct kobject *kobj)
2727{
2728 struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info,
2729 s_kobj);
2730 complete(&sbi->s_kobj_unregister);
2731}
2732
52cf25d0 2733static const struct sysfs_ops ext4_attr_ops = {
3197ebdb
TT		 2734 .show = ext4_attr_show,
2735 .store = ext4_attr_store,
2736};
2737
2738static struct kobj_type ext4_ktype = {
2739 .default_attrs = ext4_attrs,
2740 .sysfs_ops = &ext4_attr_ops,
2741 .release = ext4_sb_release,
2742};
2743
857ac889
LC		 2744static void ext4_feat_release(struct kobject *kobj)
2745{
2746 complete(&ext4_feat->f_kobj_unregister);
2747}
2748
c7f72543
LC		 2749static ssize_t ext4_feat_show(struct kobject *kobj,
2750 struct attribute *attr, char *buf)
2751{
2752 return snprintf(buf, PAGE_SIZE, "supported\n");
2753}
2754
2755/*
2756 * We can not use ext4_attr_show/store because it relies on the kobject
2757 * being embedded in the ext4_sb_info structure which is definitely not
2758 * true in this case.
2759 */
2760static const struct sysfs_ops ext4_feat_ops = {
2761 .show = ext4_feat_show,
2762 .store = NULL,
2763};
2764
857ac889
LC		 2765static struct kobj_type ext4_feat_ktype = {
2766 .default_attrs = ext4_feat_attrs,
c7f72543 2767 .sysfs_ops = &ext4_feat_ops,
857ac889
LC		 2768 .release = ext4_feat_release,
2769};
2770
a13fb1a4
ES		 2771/*
2772 * Check whether this filesystem can be mounted based on
2773 * the features present and the RDONLY/RDWR mount requested.
2774 * Returns 1 if this filesystem can be mounted as requested,
2775 * 0 if it cannot be.
2776 */
2777static int ext4_feature_set_ok(struct super_block *sb, int readonly)
2778{
2779 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP)) {
2780 ext4_msg(sb, KERN_ERR,
2781 "Couldn't mount because of "
2782 "unsupported optional features (%x)",
2783 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
2784 ~EXT4_FEATURE_INCOMPAT_SUPP));
2785 return 0;
2786 }
2787
2788 if (readonly)
2789 return 1;
2790
2791 /* Check that feature set is OK for a read-write mount */
2792 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP)) {
2793 ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of "
2794 "unsupported optional features (%x)",
2795 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
2796 ~EXT4_FEATURE_RO_COMPAT_SUPP));
2797 return 0;
2798 }
2799 /*
2800 * Large file size enabled file system can only be mounted
2801 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
2802 */
2803 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) {
2804 if (sizeof(blkcnt_t) < sizeof(u64)) {
2805 ext4_msg(sb, KERN_ERR, "Filesystem with huge files "
2806 "cannot be mounted RDWR without "
2807 "CONFIG_LBDAF");
2808 return 0;
2809 }
2810 }
bab08ab9
TT		 2811 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_BIGALLOC) &&
2812 !EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS)) {
2813 ext4_msg(sb, KERN_ERR,
2814 "Can't support bigalloc feature without "
2815 "extents feature\n");
2816 return 0;
2817 }
7c319d32
AK		 2818
2819#ifndef CONFIG_QUOTA
2820 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) &&
2821 !readonly) {
2822 ext4_msg(sb, KERN_ERR,
2823 "Filesystem with quota feature cannot be mounted RDWR "
2824 "without CONFIG_QUOTA");
2825 return 0;
2826 }
2827#endif /* CONFIG_QUOTA */
a13fb1a4
ES		 2828 return 1;
2829}
2830
66e61a9e
TT		 2831/*
2832 * This function is called once a day if we have errors logged
2833 * on the file system
2834 */
2835static void print_daily_error_info(unsigned long arg)
2836{
2837 struct super_block *sb = (struct super_block *) arg;
2838 struct ext4_sb_info *sbi;
2839 struct ext4_super_block *es;
2840
2841 sbi = EXT4_SB(sb);
2842 es = sbi->s_es;
2843
2844 if (es->s_error_count)
ae0f78de
TT		 2845 /* fsck newer than v1.41.13 is needed to clean this condition. */
2846 ext4_msg(sb, KERN_NOTICE, "error count since last fsck: %u",
66e61a9e
TT		 2847 le32_to_cpu(es->s_error_count));
2848 if (es->s_first_error_time) {
ae0f78de 2849 printk(KERN_NOTICE "EXT4-fs (%s): initial error at time %u: %.*s:%d",
66e61a9e
TT		 2850 sb->s_id, le32_to_cpu(es->s_first_error_time),
2851 (int) sizeof(es->s_first_error_func),
2852 es->s_first_error_func,
2853 le32_to_cpu(es->s_first_error_line));
2854 if (es->s_first_error_ino)
2855 printk(": inode %u",
2856 le32_to_cpu(es->s_first_error_ino));
2857 if (es->s_first_error_block)
2858 printk(": block %llu", (unsigned long long)
2859 le64_to_cpu(es->s_first_error_block));
2860 printk("\n");
2861 }
2862 if (es->s_last_error_time) {
ae0f78de 2863 printk(KERN_NOTICE "EXT4-fs (%s): last error at time %u: %.*s:%d",
66e61a9e
TT		 2864 sb->s_id, le32_to_cpu(es->s_last_error_time),
2865 (int) sizeof(es->s_last_error_func),
2866 es->s_last_error_func,
2867 le32_to_cpu(es->s_last_error_line));
2868 if (es->s_last_error_ino)
2869 printk(": inode %u",
2870 le32_to_cpu(es->s_last_error_ino));
2871 if (es->s_last_error_block)
2872 printk(": block %llu", (unsigned long long)
2873 le64_to_cpu(es->s_last_error_block));
2874 printk("\n");
2875 }
2876 mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ); /* Once a day */
2877}
2878
bfff6873
LC		 2879/* Find next suitable group and run ext4_init_inode_table */
2880static int ext4_run_li_request(struct ext4_li_request *elr)
2881{
2882 struct ext4_group_desc *gdp = NULL;
2883 ext4_group_t group, ngroups;
2884 struct super_block *sb;
2885 unsigned long timeout = 0;
2886 int ret = 0;
2887
2888 sb = elr->lr_super;
2889 ngroups = EXT4_SB(sb)->s_groups_count;
2890
8e8ad8a5 2891 sb_start_write(sb);
bfff6873
LC		 2892 for (group = elr->lr_next_group; group < ngroups; group++) {
2893 gdp = ext4_get_group_desc(sb, group, NULL);
2894 if (!gdp) {
2895 ret = 1;
2896 break;
2897 }
2898
2899 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
2900 break;
2901 }
2902
7f511862 2903 if (group >= ngroups)
bfff6873
LC		 2904 ret = 1;
2905
2906 if (!ret) {
2907 timeout = jiffies;
2908 ret = ext4_init_inode_table(sb, group,
2909 elr->lr_timeout ? 0 : 1);
2910 if (elr->lr_timeout == 0) {
51ce6511
LC		 2911 timeout = (jiffies - timeout) *
2912 elr->lr_sbi->s_li_wait_mult;
bfff6873
LC		 2913 elr->lr_timeout = timeout;
2914 }
2915 elr->lr_next_sched = jiffies + elr->lr_timeout;
2916 elr->lr_next_group = group + 1;
2917 }
8e8ad8a5 2918 sb_end_write(sb);
bfff6873
LC		 2919
2920 return ret;
2921}
2922
2923/*
2924 * Remove lr_request from the list_request and free the
4ed5c033 2925 * request structure. Should be called with li_list_mtx held
bfff6873
LC		 2926 */
2927static void ext4_remove_li_request(struct ext4_li_request *elr)
2928{
2929 struct ext4_sb_info *sbi;
2930
2931 if (!elr)
2932 return;
2933
2934 sbi = elr->lr_sbi;
2935
2936 list_del(&elr->lr_request);
2937 sbi->s_li_request = NULL;
2938 kfree(elr);
2939}
2940
2941static void ext4_unregister_li_request(struct super_block *sb)
2942{
1bb933fb
LC		 2943 mutex_lock(&ext4_li_mtx);
2944 if (!ext4_li_info) {
2945 mutex_unlock(&ext4_li_mtx);
bfff6873 2946 return;
1bb933fb 2947 }
bfff6873
LC		 2948
2949 mutex_lock(&ext4_li_info->li_list_mtx);
1bb933fb 2950 ext4_remove_li_request(EXT4_SB(sb)->s_li_request);
bfff6873 2951 mutex_unlock(&ext4_li_info->li_list_mtx);
1bb933fb 2952 mutex_unlock(&ext4_li_mtx);
bfff6873
LC		 2953}
2954
8f1f7453
ES		 2955static struct task_struct *ext4_lazyinit_task;
2956
bfff6873
LC		 2957/*
2958 * This is the function where ext4lazyinit thread lives. It walks
2959 * through the request list searching for next scheduled filesystem.
2960 * When such a fs is found, run the lazy initialization request
2961 * (ext4_rn_li_request) and keep track of the time spend in this
2962 * function. Based on that time we compute next schedule time of
2963 * the request. When walking through the list is complete, compute
2964 * next waking time and put itself into sleep.
2965 */
2966static int ext4_lazyinit_thread(void *arg)
2967{
2968 struct ext4_lazy_init *eli = (struct ext4_lazy_init *)arg;
2969 struct list_head *pos, *n;
2970 struct ext4_li_request *elr;
4ed5c033 2971 unsigned long next_wakeup, cur;
bfff6873
LC		 2972
2973 BUG_ON(NULL == eli);
2974
bfff6873
LC		 2975cont_thread:
2976 while (true) {
2977 next_wakeup = MAX_JIFFY_OFFSET;
2978
2979 mutex_lock(&eli->li_list_mtx);
2980 if (list_empty(&eli->li_request_list)) {
2981 mutex_unlock(&eli->li_list_mtx);
2982 goto exit_thread;
2983 }
2984
2985 list_for_each_safe(pos, n, &eli->li_request_list) {
2986 elr = list_entry(pos, struct ext4_li_request,
2987 lr_request);
2988
b2c78cd0
TT		 2989 if (time_after_eq(jiffies, elr->lr_next_sched)) {
2990 if (ext4_run_li_request(elr) != 0) {
2991 /* error, remove the lazy_init job */
2992 ext4_remove_li_request(elr);
2993 continue;
2994 }
bfff6873
LC		 2995 }
2996
2997 if (time_before(elr->lr_next_sched, next_wakeup))
2998 next_wakeup = elr->lr_next_sched;
2999 }
3000 mutex_unlock(&eli->li_list_mtx);
3001
a0acae0e 3002 try_to_freeze();
bfff6873 3003
4ed5c033
LC		 3004 cur = jiffies;
3005 if ((time_after_eq(cur, next_wakeup)) ||
f4245bd4 3006 (MAX_JIFFY_OFFSET == next_wakeup)) {
bfff6873
LC		 3007 cond_resched();
3008 continue;
3009 }
3010
4ed5c033
LC		 3011 schedule_timeout_interruptible(next_wakeup - cur);
3012
8f1f7453
ES		 3013 if (kthread_should_stop()) {
3014 ext4_clear_request_list();
3015 goto exit_thread;
3016 }
bfff6873
LC		 3017 }
3018
3019exit_thread:
3020 /*
3021 * It looks like the request list is empty, but we need
3022 * to check it under the li_list_mtx lock, to prevent any
3023 * additions into it, and of course we should lock ext4_li_mtx
3024 * to atomically free the list and ext4_li_info, because at
3025 * this point another ext4 filesystem could be registering
3026 * new one.
3027 */
3028 mutex_lock(&ext4_li_mtx);
3029 mutex_lock(&eli->li_list_mtx);
3030 if (!list_empty(&eli->li_request_list)) {
3031 mutex_unlock(&eli->li_list_mtx);
3032 mutex_unlock(&ext4_li_mtx);
3033 goto cont_thread;
3034 }
3035 mutex_unlock(&eli->li_list_mtx);
bfff6873
LC		 3036 kfree(ext4_li_info);
3037 ext4_li_info = NULL;
3038 mutex_unlock(&ext4_li_mtx);
3039
3040 return 0;
3041}
3042
3043static void ext4_clear_request_list(void)
3044{
3045 struct list_head *pos, *n;
3046 struct ext4_li_request *elr;
3047
3048 mutex_lock(&ext4_li_info->li_list_mtx);
bfff6873
LC		 3049 list_for_each_safe(pos, n, &ext4_li_info->li_request_list) {
3050 elr = list_entry(pos, struct ext4_li_request,
3051 lr_request);
3052 ext4_remove_li_request(elr);
3053 }
3054 mutex_unlock(&ext4_li_info->li_list_mtx);
3055}
3056
3057static int ext4_run_lazyinit_thread(void)
3058{
8f1f7453
ES		 3059 ext4_lazyinit_task = kthread_run(ext4_lazyinit_thread,
3060 ext4_li_info, "ext4lazyinit");
3061 if (IS_ERR(ext4_lazyinit_task)) {
3062 int err = PTR_ERR(ext4_lazyinit_task);
bfff6873 3063 ext4_clear_request_list();
bfff6873
LC		 3064 kfree(ext4_li_info);
3065 ext4_li_info = NULL;
92b97816 3066 printk(KERN_CRIT "EXT4-fs: error %d creating inode table "
bfff6873
LC		 3067 "initialization thread\n",
3068 err);
3069 return err;
3070 }
3071 ext4_li_info->li_state |= EXT4_LAZYINIT_RUNNING;
bfff6873
LC		 3072 return 0;
3073}
3074
3075/*
3076 * Check whether it make sense to run itable init. thread or not.
3077 * If there is at least one uninitialized inode table, return
3078 * corresponding group number, else the loop goes through all
3079 * groups and return total number of groups.
3080 */
3081static ext4_group_t ext4_has_uninit_itable(struct super_block *sb)
3082{
3083 ext4_group_t group, ngroups = EXT4_SB(sb)->s_groups_count;
3084 struct ext4_group_desc *gdp = NULL;
3085
3086 for (group = 0; group < ngroups; group++) {
3087 gdp = ext4_get_group_desc(sb, group, NULL);
3088 if (!gdp)
3089 continue;
3090
3091 if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
3092 break;
3093 }
3094
3095 return group;
3096}
3097
3098static int ext4_li_info_new(void)
3099{
3100 struct ext4_lazy_init *eli = NULL;
3101
3102 eli = kzalloc(sizeof(*eli), GFP_KERNEL);
3103 if (!eli)
3104 return -ENOMEM;
3105
bfff6873
LC		 3106 INIT_LIST_HEAD(&eli->li_request_list);
3107 mutex_init(&eli->li_list_mtx);
3108
bfff6873
LC		 3109 eli->li_state |= EXT4_LAZYINIT_QUIT;
3110
3111 ext4_li_info = eli;
3112
3113 return 0;
3114}
3115
3116static struct ext4_li_request *ext4_li_request_new(struct super_block *sb,
3117 ext4_group_t start)
3118{
3119 struct ext4_sb_info *sbi = EXT4_SB(sb);
3120 struct ext4_li_request *elr;
bfff6873
LC		 3121
3122 elr = kzalloc(sizeof(*elr), GFP_KERNEL);
3123 if (!elr)
3124 return NULL;
3125
3126 elr->lr_super = sb;
3127 elr->lr_sbi = sbi;
3128 elr->lr_next_group = start;
3129
3130 /*
3131 * Randomize first schedule time of the request to
3132 * spread the inode table initialization requests
3133 * better.
3134 */
dd1f723b
TT		 3135 elr->lr_next_sched = jiffies + (prandom_u32() %
3136 (EXT4_DEF_LI_MAX_START_DELAY * HZ));
bfff6873
LC		 3137 return elr;
3138}
3139
7f511862
TT		 3140int ext4_register_li_request(struct super_block *sb,
3141 ext4_group_t first_not_zeroed)
bfff6873
LC		 3142{
3143 struct ext4_sb_info *sbi = EXT4_SB(sb);
7f511862 3144 struct ext4_li_request *elr = NULL;
bfff6873 3145 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
6c5a6cb9 3146 int ret = 0;
bfff6873 3147
7f511862 3148 mutex_lock(&ext4_li_mtx);
51ce6511
LC		 3149 if (sbi->s_li_request != NULL) {
3150 /*
3151 * Reset timeout so it can be computed again, because
3152 * s_li_wait_mult might have changed.
3153 */
3154 sbi->s_li_request->lr_timeout = 0;
7f511862 3155 goto out;
51ce6511 3156 }
bfff6873
LC		 3157
3158 if (first_not_zeroed == ngroups ||
3159 (sb->s_flags & MS_RDONLY) ||
55ff3840 3160 !test_opt(sb, INIT_INODE_TABLE))
7f511862 3161 goto out;
bfff6873
LC		 3162
3163 elr = ext4_li_request_new(sb, first_not_zeroed);
7f511862
TT		 3164 if (!elr) {
3165 ret = -ENOMEM;
3166 goto out;
3167 }
bfff6873
LC		 3168
3169 if (NULL == ext4_li_info) {
3170 ret = ext4_li_info_new();
3171 if (ret)
3172 goto out;
3173 }
3174
3175 mutex_lock(&ext4_li_info->li_list_mtx);
3176 list_add(&elr->lr_request, &ext4_li_info->li_request_list);
3177 mutex_unlock(&ext4_li_info->li_list_mtx);
3178
3179 sbi->s_li_request = elr;
46e4690b
TM		 3180 /*
3181 * set elr to NULL here since it has been inserted to
3182 * the request_list and the removal and free of it is
3183 * handled by ext4_clear_request_list from now on.
3184 */
3185 elr = NULL;
bfff6873
LC		 3186
3187 if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) {
3188 ret = ext4_run_lazyinit_thread();
3189 if (ret)
3190 goto out;
3191 }
bfff6873 3192out:
beed5ecb
NK		 3193 mutex_unlock(&ext4_li_mtx);
3194 if (ret)
bfff6873 3195 kfree(elr);
bfff6873
LC		 3196 return ret;
3197}
3198
3199/*
3200 * We do not need to lock anything since this is called on
3201 * module unload.
3202 */
3203static void ext4_destroy_lazyinit_thread(void)
3204{
3205 /*
3206 * If thread exited earlier
3207 * there's nothing to be done.
3208 */
8f1f7453 3209 if (!ext4_li_info || !ext4_lazyinit_task)
bfff6873
LC		 3210 return;
3211
8f1f7453 3212 kthread_stop(ext4_lazyinit_task);
bfff6873
LC		 3213}
3214
25ed6e8a
DW		 3215static int set_journal_csum_feature_set(struct super_block *sb)
3216{
3217 int ret = 1;
3218 int compat, incompat;
3219 struct ext4_sb_info *sbi = EXT4_SB(sb);
3220
3221 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3222 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) {
db9ee220 3223 /* journal checksum v3 */
25ed6e8a 3224 compat = 0;
db9ee220 3225 incompat = JBD2_FEATURE_INCOMPAT_CSUM_V3;
25ed6e8a
DW		 3226 } else {
3227 /* journal checksum v1 */
3228 compat = JBD2_FEATURE_COMPAT_CHECKSUM;
3229 incompat = 0;
3230 }
3231
feb8c6d3
DW		 3232 jbd2_journal_clear_features(sbi->s_journal,
3233 JBD2_FEATURE_COMPAT_CHECKSUM, 0,
3234 JBD2_FEATURE_INCOMPAT_CSUM_V3 |
3235 JBD2_FEATURE_INCOMPAT_CSUM_V2);
25ed6e8a
DW		 3236 if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
3237 ret = jbd2_journal_set_features(sbi->s_journal,
3238 compat, 0,
3239 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT |
3240 incompat);
3241 } else if (test_opt(sb, JOURNAL_CHECKSUM)) {
3242 ret = jbd2_journal_set_features(sbi->s_journal,
3243 compat, 0,
3244 incompat);
3245 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
3246 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
3247 } else {
feb8c6d3
DW		 3248 jbd2_journal_clear_features(sbi->s_journal, 0, 0,
3249 JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
25ed6e8a
DW		 3250 }
3251
3252 return ret;
3253}
3254
952fc18e
TT		 3255/*
3256 * Note: calculating the overhead so we can be compatible with
3257 * historical BSD practice is quite difficult in the face of
3258 * clusters/bigalloc. This is because multiple metadata blocks from
3259 * different block group can end up in the same allocation cluster.
3260 * Calculating the exact overhead in the face of clustered allocation
3261 * requires either O(all block bitmaps) in memory or O(number of block
3262 * groups**2) in time. We will still calculate the superblock for
3263 * older file systems --- and if we come across with a bigalloc file
3264 * system with zero in s_overhead_clusters the estimate will be close to
3265 * correct especially for very large cluster sizes --- but for newer
3266 * file systems, it's better to calculate this figure once at mkfs
3267 * time, and store it in the superblock. If the superblock value is
3268 * present (even for non-bigalloc file systems), we will use it.
3269 */
3270static int count_overhead(struct super_block *sb, ext4_group_t grp,
3271 char *buf)
3272{
3273 struct ext4_sb_info *sbi = EXT4_SB(sb);
3274 struct ext4_group_desc *gdp;
3275 ext4_fsblk_t first_block, last_block, b;
3276 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3277 int s, j, count = 0;
3278
0548bbb8
TT		 3279 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_BIGALLOC))
3280 return (ext4_bg_has_super(sb, grp) + ext4_bg_num_gdb(sb, grp) +
3281 sbi->s_itb_per_group + 2);
3282
952fc18e
TT		 3283 first_block = le32_to_cpu(sbi->s_es->s_first_data_block) +
3284 (grp * EXT4_BLOCKS_PER_GROUP(sb));
3285 last_block = first_block + EXT4_BLOCKS_PER_GROUP(sb) - 1;
3286 for (i = 0; i < ngroups; i++) {
3287 gdp = ext4_get_group_desc(sb, i, NULL);
3288 b = ext4_block_bitmap(sb, gdp);
3289 if (b >= first_block && b <= last_block) {
3290 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3291 count++;
3292 }
3293 b = ext4_inode_bitmap(sb, gdp);
3294 if (b >= first_block && b <= last_block) {
3295 ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
3296 count++;
3297 }
3298 b = ext4_inode_table(sb, gdp);
3299 if (b >= first_block && b + sbi->s_itb_per_group <= last_block)
3300 for (j = 0; j < sbi->s_itb_per_group; j++, b++) {
3301 int c = EXT4_B2C(sbi, b - first_block);
3302 ext4_set_bit(c, buf);
3303 count++;
3304 }
3305 if (i != grp)
3306 continue;
3307 s = 0;
3308 if (ext4_bg_has_super(sb, grp)) {
3309 ext4_set_bit(s++, buf);
3310 count++;
3311 }
3312 for (j = ext4_bg_num_gdb(sb, grp); j > 0; j--) {
3313 ext4_set_bit(EXT4_B2C(sbi, s++), buf);
3314 count++;
3315 }
3316 }
3317 if (!count)
3318 return 0;
3319 return EXT4_CLUSTERS_PER_GROUP(sb) -
3320 ext4_count_free(buf, EXT4_CLUSTERS_PER_GROUP(sb) / 8);
3321}
3322
3323/*
3324 * Compute the overhead and stash it in sbi->s_overhead
3325 */
3326int ext4_calculate_overhead(struct super_block *sb)
3327{
3328 struct ext4_sb_info *sbi = EXT4_SB(sb);
3329 struct ext4_super_block *es = sbi->s_es;
3330 ext4_group_t i, ngroups = ext4_get_groups_count(sb);
3331 ext4_fsblk_t overhead = 0;
3332 char *buf = (char *) get_zeroed_page(GFP_KERNEL);
3333
952fc18e
TT		 3334 if (!buf)
3335 return -ENOMEM;
3336
3337 /*
3338 * Compute the overhead (FS structures). This is constant
3339 * for a given filesystem unless the number of block groups
3340 * changes so we cache the previous value until it does.
3341 */
3342
3343 /*
3344 * All of the blocks before first_data_block are overhead
3345 */
3346 overhead = EXT4_B2C(sbi, le32_to_cpu(es->s_first_data_block));
3347
3348 /*
3349 * Add the overhead found in each block group
3350 */
3351 for (i = 0; i < ngroups; i++) {
3352 int blks;
3353
3354 blks = count_overhead(sb, i, buf);
3355 overhead += blks;
3356 if (blks)
3357 memset(buf, 0, PAGE_SIZE);
3358 cond_resched();
3359 }
0875a2b4
ES		 3360 /* Add the journal blocks as well */
3361 if (sbi->s_journal)
810da240 3362 overhead += EXT4_NUM_B2C(sbi, sbi->s_journal->j_maxlen);
0875a2b4 3363
952fc18e
TT		 3364 sbi->s_overhead = overhead;
3365 smp_wmb();
3366 free_page((unsigned long) buf);
3367 return 0;
3368}
3369
27dd4385 3370
30fac0f7 3371static ext4_fsblk_t ext4_calculate_resv_clusters(struct super_block *sb)
27dd4385
LC		 3372{
3373 ext4_fsblk_t resv_clusters;
3374
30fac0f7
JK		 3375 /*
3376 * There's no need to reserve anything when we aren't using extents.
3377 * The space estimates are exact, there are no unwritten extents,
3378 * hole punching doesn't need new metadata... This is needed especially
3379 * to keep ext2/3 backward compatibility.
3380 */
3381 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS))
3382 return 0;
27dd4385
LC		 3383 /*
3384 * By default we reserve 2% or 4096 clusters, whichever is smaller.
3385 * This should cover the situations where we can not afford to run
3386 * out of space like for example punch hole, or converting
556615dc 3387 * unwritten extents in delalloc path. In most cases such
27dd4385
LC		 3388 * allocation would require 1, or 2 blocks, higher numbers are
3389 * very rare.
3390 */
30fac0f7
JK		 3391 resv_clusters = ext4_blocks_count(EXT4_SB(sb)->s_es) >>
3392 EXT4_SB(sb)->s_cluster_bits;
27dd4385
LC		 3393
3394 do_div(resv_clusters, 50);
3395 resv_clusters = min_t(ext4_fsblk_t, resv_clusters, 4096);
3396
3397 return resv_clusters;
3398}
3399
3400
3401static int ext4_reserve_clusters(struct ext4_sb_info *sbi, ext4_fsblk_t count)
3402{
3403 ext4_fsblk_t clusters = ext4_blocks_count(sbi->s_es) >>
3404 sbi->s_cluster_bits;
3405
3406 if (count >= clusters)
3407 return -EINVAL;
3408
3409 atomic64_set(&sbi->s_resv_clusters, count);
3410 return 0;
3411}
3412
2b2d6d01 3413static int ext4_fill_super(struct super_block *sb, void *data, int silent)
ac27a0ec 3414{
d4c402d9 3415 char *orig_data = kstrdup(data, GFP_KERNEL);
2b2d6d01 3416 struct buffer_head *bh;
617ba13b
MC		 3417 struct ext4_super_block *es = NULL;
3418 struct ext4_sb_info *sbi;
3419 ext4_fsblk_t block;
3420 ext4_fsblk_t sb_block = get_sb_block(&data);
70bbb3e0 3421 ext4_fsblk_t logical_sb_block;
ac27a0ec 3422 unsigned long offset = 0;
ac27a0ec
DK		 3423 unsigned long journal_devnum = 0;
3424 unsigned long def_mount_opts;
3425 struct inode *root;
9f6200bb 3426 char *cp;
0390131b 3427 const char *descr;
dcc7dae3 3428 int ret = -ENOMEM;
281b5995 3429 int blocksize, clustersize;
4ec11028
TT		 3430 unsigned int db_count;
3431 unsigned int i;
281b5995 3432 int needs_recovery, has_huge_files, has_bigalloc;
bd81d8ee 3433 __u64 blocks_count;
07aa2ea1 3434 int err = 0;
b3881f74 3435 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
bfff6873 3436 ext4_group_t first_not_zeroed;
ac27a0ec
DK		 3437
3438 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
3439 if (!sbi)
dcc7dae3 3440 goto out_free_orig;
705895b6
PE		 3441
3442 sbi->s_blockgroup_lock =
3443 kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
3444 if (!sbi->s_blockgroup_lock) {
3445 kfree(sbi);
dcc7dae3 3446 goto out_free_orig;
705895b6 3447 }
ac27a0ec 3448 sb->s_fs_info = sbi;
2c0544b2 3449 sbi->s_sb = sb;
240799cd 3450 sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
d9c9bef1 3451 sbi->s_sb_block = sb_block;
f613dfcb
TT		 3452 if (sb->s_bdev->bd_part)
3453 sbi->s_sectors_written_start =
3454 part_stat_read(sb->s_bdev->bd_part, sectors[1]);
ac27a0ec 3455
9f6200bb
TT		 3456 /* Cleanup superblock name */
3457 for (cp = sb->s_id; (cp = strchr(cp, '/'));)
3458 *cp = '!';
3459
07aa2ea1 3460 /* -EINVAL is default */
dcc7dae3 3461 ret = -EINVAL;
617ba13b 3462 blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
ac27a0ec 3463 if (!blocksize) {
b31e1552 3464 ext4_msg(sb, KERN_ERR, "unable to set blocksize");
ac27a0ec
DK		 3465 goto out_fail;
3466 }
3467
3468 /*
617ba13b 3469 * The ext4 superblock will not be buffer aligned for other than 1kB
ac27a0ec
DK		 3470 * block sizes. We need to calculate the offset from buffer start.
3471 */
617ba13b 3472 if (blocksize != EXT4_MIN_BLOCK_SIZE) {
70bbb3e0
AM		 3473 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3474 offset = do_div(logical_sb_block, blocksize);
ac27a0ec 3475 } else {
70bbb3e0 3476 logical_sb_block = sb_block;
ac27a0ec
DK		 3477 }
3478
a8ac900b 3479 if (!(bh = sb_bread_unmovable(sb, logical_sb_block))) {
b31e1552 3480 ext4_msg(sb, KERN_ERR, "unable to read superblock");
ac27a0ec
DK		 3481 goto out_fail;
3482 }
3483 /*
3484 * Note: s_es must be initialized as soon as possible because
617ba13b 3485 * some ext4 macro-instructions depend on its value
ac27a0ec 3486 */
2716b802 3487 es = (struct ext4_super_block *) (bh->b_data + offset);
ac27a0ec
DK		 3488 sbi->s_es = es;
3489 sb->s_magic = le16_to_cpu(es->s_magic);
617ba13b
MC		 3490 if (sb->s_magic != EXT4_SUPER_MAGIC)
3491 goto cantfind_ext4;
afc32f7e 3492 sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
ac27a0ec 3493
feb0ab32
DW		 3494 /* Warn if metadata_csum and gdt_csum are both set. */
3495 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3496 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) &&
3497 EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_GDT_CSUM))
3498 ext4_warning(sb, KERN_INFO "metadata_csum and uninit_bg are "
3499 "redundant flags; please run fsck.");
3500
d25425f8
DW		 3501 /* Check for a known checksum algorithm */
3502 if (!ext4_verify_csum_type(sb, es)) {
3503 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3504 "unknown checksum algorithm.");
3505 silent = 1;
3506 goto cantfind_ext4;
3507 }
3508
0441984a
DW		 3509 /* Load the checksum driver */
3510 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3511 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) {
3512 sbi->s_chksum_driver = crypto_alloc_shash("crc32c", 0, 0);
3513 if (IS_ERR(sbi->s_chksum_driver)) {
3514 ext4_msg(sb, KERN_ERR, "Cannot load crc32c driver.");
3515 ret = PTR_ERR(sbi->s_chksum_driver);
3516 sbi->s_chksum_driver = NULL;
3517 goto failed_mount;
3518 }
3519 }
3520
a9c47317
DW		 3521 /* Check superblock checksum */
3522 if (!ext4_superblock_csum_verify(sb, es)) {
3523 ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
3524 "invalid superblock checksum. Run e2fsck?");
3525 silent = 1;
3526 goto cantfind_ext4;
3527 }
3528
3529 /* Precompute checksum seed for all metadata */
3530 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
3531 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
3532 sbi->s_csum_seed = ext4_chksum(sbi, ~0, es->s_uuid,
3533 sizeof(es->s_uuid));
3534
ac27a0ec
DK		 3535 /* Set defaults before we parse the mount options */
3536 def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
fd8c37ec 3537 set_opt(sb, INIT_INODE_TABLE);
617ba13b 3538 if (def_mount_opts & EXT4_DEFM_DEBUG)
fd8c37ec 3539 set_opt(sb, DEBUG);
87f26807 3540 if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
fd8c37ec 3541 set_opt(sb, GRPID);
617ba13b 3542 if (def_mount_opts & EXT4_DEFM_UID16)
fd8c37ec 3543 set_opt(sb, NO_UID32);
ea663336 3544 /* xattr user namespace & acls are now defaulted on */
ea663336 3545 set_opt(sb, XATTR_USER);
03010a33 3546#ifdef CONFIG_EXT4_FS_POSIX_ACL
ea663336 3547 set_opt(sb, POSIX_ACL);
2e7842b8 3548#endif
617ba13b 3549 if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
fd8c37ec 3550 set_opt(sb, JOURNAL_DATA);
617ba13b 3551 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
fd8c37ec 3552 set_opt(sb, ORDERED_DATA);
617ba13b 3553 else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
fd8c37ec 3554 set_opt(sb, WRITEBACK_DATA);
617ba13b
MC		 3555
3556 if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
fd8c37ec 3557 set_opt(sb, ERRORS_PANIC);
bb4f397a 3558 else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
fd8c37ec 3559 set_opt(sb, ERRORS_CONT);
bb4f397a 3560 else
fd8c37ec 3561 set_opt(sb, ERRORS_RO);
45f1a9c3
DW		 3562 /* block_validity enabled by default; disable with noblock_validity */
3563 set_opt(sb, BLOCK_VALIDITY);
8b67f04a 3564 if (def_mount_opts & EXT4_DEFM_DISCARD)
fd8c37ec 3565 set_opt(sb, DISCARD);
ac27a0ec 3566
08cefc7a
EB		 3567 sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));
3568 sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid));
30773840
TT		 3569 sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
3570 sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
3571 sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
ac27a0ec 3572
8b67f04a 3573 if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0)
fd8c37ec 3574 set_opt(sb, BARRIER);
ac27a0ec 3575
dd919b98
AK		 3576 /*
3577 * enable delayed allocation by default
3578 * Use -o nodelalloc to turn it off
3579 */
bc0b75f7 3580 if (!IS_EXT3_SB(sb) && !IS_EXT2_SB(sb) &&
8b67f04a 3581 ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0))
fd8c37ec 3582 set_opt(sb, DELALLOC);
dd919b98 3583
51ce6511
LC		 3584 /*
3585 * set default s_li_wait_mult for lazyinit, for the case there is
3586 * no mount option specified.
3587 */
3588 sbi->s_li_wait_mult = EXT4_DEF_LI_WAIT_MULT;
3589
8b67f04a 3590 if (!parse_options((char *) sbi->s_es->s_mount_opts, sb,
661aa520 3591 &journal_devnum, &journal_ioprio, 0)) {
8b67f04a
TT		 3592 ext4_msg(sb, KERN_WARNING,
3593 "failed to parse options in superblock: %s",
3594 sbi->s_es->s_mount_opts);
3595 }
5a916be1 3596 sbi->s_def_mount_opt = sbi->s_mount_opt;
b3881f74 3597 if (!parse_options((char *) data, sb, &journal_devnum,
661aa520 3598 &journal_ioprio, 0))
ac27a0ec
DK		 3599 goto failed_mount;
3600
56889787
TT		 3601 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
3602 printk_once(KERN_WARNING "EXT4-fs: Warning: mounting "
3603 "with data=journal disables delayed "
3604 "allocation and O_DIRECT support!\n");
3605 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
3606 ext4_msg(sb, KERN_ERR, "can't mount with "
3607 "both data=journal and delalloc");
3608 goto failed_mount;
3609 }
3610 if (test_opt(sb, DIOREAD_NOLOCK)) {
3611 ext4_msg(sb, KERN_ERR, "can't mount with "
6ae6514b 3612 "both data=journal and dioread_nolock");
56889787
TT		 3613 goto failed_mount;
3614 }
3615 if (test_opt(sb, DELALLOC))
3616 clear_opt(sb, DELALLOC);
3617 }
3618
ac27a0ec 3619 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
482a7425 3620 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec 3621
617ba13b
MC		 3622 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
3623 (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
3624 EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
3625 EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U)))
b31e1552
ES		 3626 ext4_msg(sb, KERN_WARNING,
3627 "feature flags set on rev 0 fs, "
3628 "running e2fsck is recommended");
469108ff 3629
ed3654eb
TT		 3630 if (es->s_creator_os == cpu_to_le32(EXT4_OS_HURD)) {
3631 set_opt2(sb, HURD_COMPAT);
3632 if (EXT4_HAS_INCOMPAT_FEATURE(sb,
3633 EXT4_FEATURE_INCOMPAT_64BIT)) {
3634 ext4_msg(sb, KERN_ERR,
3635 "The Hurd can't support 64-bit file systems");
3636 goto failed_mount;
3637 }
3638 }
3639
2035e776
TT		 3640 if (IS_EXT2_SB(sb)) {
3641 if (ext2_feature_set_ok(sb))
3642 ext4_msg(sb, KERN_INFO, "mounting ext2 file system "
3643 "using the ext4 subsystem");
3644 else {
3645 ext4_msg(sb, KERN_ERR, "couldn't mount as ext2 due "
3646 "to feature incompatibilities");
3647 goto failed_mount;
3648 }
3649 }
3650
3651 if (IS_EXT3_SB(sb)) {
3652 if (ext3_feature_set_ok(sb))
3653 ext4_msg(sb, KERN_INFO, "mounting ext3 file system "
3654 "using the ext4 subsystem");
3655 else {
3656 ext4_msg(sb, KERN_ERR, "couldn't mount as ext3 due "
3657 "to feature incompatibilities");
3658 goto failed_mount;
3659 }
3660 }
3661
ac27a0ec
DK		 3662 /*
3663 * Check feature flags regardless of the revision level, since we
3664 * previously didn't change the revision level when setting the flags,
3665 * so there is a chance incompat flags are set on a rev 0 filesystem.
3666 */
a13fb1a4 3667 if (!ext4_feature_set_ok(sb, (sb->s_flags & MS_RDONLY)))
ac27a0ec 3668 goto failed_mount;
a13fb1a4 3669
261cb20c 3670 blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
617ba13b
MC		 3671 if (blocksize < EXT4_MIN_BLOCK_SIZE ||
3672 blocksize > EXT4_MAX_BLOCK_SIZE) {
b31e1552
ES		 3673 ext4_msg(sb, KERN_ERR,
3674 "Unsupported filesystem blocksize %d", blocksize);
ac27a0ec
DK		 3675 goto failed_mount;
3676 }
3677
ac27a0ec 3678 if (sb->s_blocksize != blocksize) {
ce40733c
AK		 3679 /* Validate the filesystem blocksize */
3680 if (!sb_set_blocksize(sb, blocksize)) {
b31e1552 3681 ext4_msg(sb, KERN_ERR, "bad block size %d",
ce40733c 3682 blocksize);
ac27a0ec
DK		 3683 goto failed_mount;
3684 }
3685
2b2d6d01 3686 brelse(bh);
70bbb3e0
AM		 3687 logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
3688 offset = do_div(logical_sb_block, blocksize);
a8ac900b 3689 bh = sb_bread_unmovable(sb, logical_sb_block);
ac27a0ec 3690 if (!bh) {
b31e1552
ES		 3691 ext4_msg(sb, KERN_ERR,
3692 "Can't read superblock on 2nd try");
ac27a0ec
DK		 3693 goto failed_mount;
3694 }
2716b802 3695 es = (struct ext4_super_block *)(bh->b_data + offset);
ac27a0ec 3696 sbi->s_es = es;
617ba13b 3697 if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
b31e1552
ES		 3698 ext4_msg(sb, KERN_ERR,
3699 "Magic mismatch, very weird!");
ac27a0ec
DK		 3700 goto failed_mount;
3701 }
3702 }
3703
a13fb1a4
ES		 3704 has_huge_files = EXT4_HAS_RO_COMPAT_FEATURE(sb,
3705 EXT4_FEATURE_RO_COMPAT_HUGE_FILE);
f287a1a5
TT		 3706 sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
3707 has_huge_files);
3708 sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
ac27a0ec 3709
617ba13b
MC		 3710 if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
3711 sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
3712 sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
ac27a0ec
DK		 3713 } else {
3714 sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
3715 sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
617ba13b 3716 if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
1330593e 3717 (!is_power_of_2(sbi->s_inode_size)) ||
ac27a0ec 3718 (sbi->s_inode_size > blocksize)) {
b31e1552
ES		 3719 ext4_msg(sb, KERN_ERR,
3720 "unsupported inode size: %d",
2b2d6d01 3721 sbi->s_inode_size);
ac27a0ec
DK		 3722 goto failed_mount;
3723 }
ef7f3835
KS		 3724 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
3725 sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
ac27a0ec 3726 }
0b8e58a1 3727
0d1ee42f
AR		 3728 sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
3729 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
8fadc143 3730 if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
0d1ee42f 3731 sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
d8ea6cf8 3732 !is_power_of_2(sbi->s_desc_size)) {
b31e1552
ES		 3733 ext4_msg(sb, KERN_ERR,
3734 "unsupported descriptor size %lu",
0d1ee42f
AR		 3735 sbi->s_desc_size);
3736 goto failed_mount;
3737 }
3738 } else
3739 sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
0b8e58a1 3740
ac27a0ec 3741 sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
ac27a0ec 3742 sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
b47b6f38 3743 if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0)
617ba13b 3744 goto cantfind_ext4;
0b8e58a1 3745
617ba13b 3746 sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
ac27a0ec 3747 if (sbi->s_inodes_per_block == 0)
617ba13b 3748 goto cantfind_ext4;
ac27a0ec
DK		 3749 sbi->s_itb_per_group = sbi->s_inodes_per_group /
3750 sbi->s_inodes_per_block;
0d1ee42f 3751 sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
ac27a0ec
DK		 3752 sbi->s_sbh = bh;
3753 sbi->s_mount_state = le16_to_cpu(es->s_state);
e57aa839
FW		 3754 sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
3755 sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
0b8e58a1 3756
2b2d6d01 3757 for (i = 0; i < 4; i++)
ac27a0ec
DK		 3758 sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
3759 sbi->s_def_hash_version = es->s_def_hash_version;
23301410
TT		 3760 if (EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_DIR_INDEX)) {
3761 i = le32_to_cpu(es->s_flags);
3762 if (i & EXT2_FLAGS_UNSIGNED_HASH)
3763 sbi->s_hash_unsigned = 3;
3764 else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
f99b2589 3765#ifdef __CHAR_UNSIGNED__
23301410
TT		 3766 if (!(sb->s_flags & MS_RDONLY))
3767 es->s_flags |=
3768 cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
3769 sbi->s_hash_unsigned = 3;
f99b2589 3770#else
23301410
TT		 3771 if (!(sb->s_flags & MS_RDONLY))
3772 es->s_flags |=
3773 cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
f99b2589 3774#endif
23301410 3775 }
f99b2589 3776 }
ac27a0ec 3777
281b5995
TT		 3778 /* Handle clustersize */
3779 clustersize = BLOCK_SIZE << le32_to_cpu(es->s_log_cluster_size);
3780 has_bigalloc = EXT4_HAS_RO_COMPAT_FEATURE(sb,
3781 EXT4_FEATURE_RO_COMPAT_BIGALLOC);
3782 if (has_bigalloc) {
3783 if (clustersize < blocksize) {
3784 ext4_msg(sb, KERN_ERR,
3785 "cluster size (%d) smaller than "
3786 "block size (%d)", clustersize, blocksize);
3787 goto failed_mount;
3788 }
3789 sbi->s_cluster_bits = le32_to_cpu(es->s_log_cluster_size) -
3790 le32_to_cpu(es->s_log_block_size);
3791 sbi->s_clusters_per_group =
3792 le32_to_cpu(es->s_clusters_per_group);
3793 if (sbi->s_clusters_per_group > blocksize * 8) {
3794 ext4_msg(sb, KERN_ERR,
3795 "#clusters per group too big: %lu",
3796 sbi->s_clusters_per_group);
3797 goto failed_mount;
3798 }
3799 if (sbi->s_blocks_per_group !=
3800 (sbi->s_clusters_per_group * (clustersize / blocksize))) {
3801 ext4_msg(sb, KERN_ERR, "blocks per group (%lu) and "
3802 "clusters per group (%lu) inconsistent",
3803 sbi->s_blocks_per_group,
3804 sbi->s_clusters_per_group);
3805 goto failed_mount;
3806 }
3807 } else {
3808 if (clustersize != blocksize) {
3809 ext4_warning(sb, "fragment/cluster size (%d) != "
3810 "block size (%d)", clustersize,
3811 blocksize);
3812 clustersize = blocksize;
3813 }
3814 if (sbi->s_blocks_per_group > blocksize * 8) {
3815 ext4_msg(sb, KERN_ERR,
3816 "#blocks per group too big: %lu",
3817 sbi->s_blocks_per_group);
3818 goto failed_mount;
3819 }
3820 sbi->s_clusters_per_group = sbi->s_blocks_per_group;
3821 sbi->s_cluster_bits = 0;
ac27a0ec 3822 }
281b5995
TT		 3823 sbi->s_cluster_ratio = clustersize / blocksize;
3824
ac27a0ec 3825 if (sbi->s_inodes_per_group > blocksize * 8) {
b31e1552
ES		 3826 ext4_msg(sb, KERN_ERR,
3827 "#inodes per group too big: %lu",
2b2d6d01 3828 sbi->s_inodes_per_group);
ac27a0ec
DK		 3829 goto failed_mount;
3830 }
3831
960fd856
TT		 3832 /* Do we have standard group size of clustersize * 8 blocks ? */
3833 if (sbi->s_blocks_per_group == clustersize << 3)
3834 set_opt2(sb, STD_GROUP_SIZE);
3835
bf43d84b
ES		 3836 /*
3837 * Test whether we have more sectors than will fit in sector_t,
3838 * and whether the max offset is addressable by the page cache.
3839 */
5a9ae68a 3840 err = generic_check_addressable(sb->s_blocksize_bits,
30ca22c7 3841 ext4_blocks_count(es));
5a9ae68a 3842 if (err) {
b31e1552 3843 ext4_msg(sb, KERN_ERR, "filesystem"
bf43d84b 3844 " too large to mount safely on this system");
ac27a0ec 3845 if (sizeof(sector_t) < 8)
90c699a9 3846 ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled");
ac27a0ec
DK		 3847 goto failed_mount;
3848 }
3849
617ba13b
MC		 3850 if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
3851 goto cantfind_ext4;
e7c95593 3852
0f2ddca6
FTN		 3853 /* check blocks count against device size */
3854 blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
3855 if (blocks_count && ext4_blocks_count(es) > blocks_count) {
b31e1552
ES		 3856 ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
3857 "exceeds size of device (%llu blocks)",
0f2ddca6
FTN		 3858 ext4_blocks_count(es), blocks_count);
3859 goto failed_mount;
3860 }
3861
0b8e58a1
AD		 3862 /*
3863 * It makes no sense for the first data block to be beyond the end
3864 * of the filesystem.
3865 */
3866 if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
5635a62b 3867 ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
b31e1552
ES		 3868 "block %u is beyond end of filesystem (%llu)",
3869 le32_to_cpu(es->s_first_data_block),
3870 ext4_blocks_count(es));
e7c95593
ES		 3871 goto failed_mount;
3872 }
bd81d8ee
LV		 3873 blocks_count = (ext4_blocks_count(es) -
3874 le32_to_cpu(es->s_first_data_block) +
3875 EXT4_BLOCKS_PER_GROUP(sb) - 1);
3876 do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
4ec11028 3877 if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
b31e1552 3878 ext4_msg(sb, KERN_WARNING, "groups count too large: %u "
4ec11028 3879 "(block count %llu, first data block %u, "
b31e1552 3880 "blocks per group %lu)", sbi->s_groups_count,
4ec11028
TT		 3881 ext4_blocks_count(es),
3882 le32_to_cpu(es->s_first_data_block),
3883 EXT4_BLOCKS_PER_GROUP(sb));
3884 goto failed_mount;
3885 }
bd81d8ee 3886 sbi->s_groups_count = blocks_count;
fb0a387d
ES		 3887 sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
3888 (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
617ba13b
MC		 3889 db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
3890 EXT4_DESC_PER_BLOCK(sb);
f18a5f21
TT		 3891 sbi->s_group_desc = ext4_kvmalloc(db_count *
3892 sizeof(struct buffer_head *),
3893 GFP_KERNEL);
ac27a0ec 3894 if (sbi->s_group_desc == NULL) {
b31e1552 3895 ext4_msg(sb, KERN_ERR, "not enough memory");
2cde417d 3896 ret = -ENOMEM;
ac27a0ec
DK		 3897 goto failed_mount;
3898 }
3899
9f6200bb
TT		 3900 if (ext4_proc_root)
3901 sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);
240799cd 3902
66acdcf4
TT		 3903 if (sbi->s_proc)
3904 proc_create_data("options", S_IRUGO, sbi->s_proc,
3905 &ext4_seq_options_fops, sb);
3906
705895b6 3907 bgl_lock_init(sbi->s_blockgroup_lock);
ac27a0ec
DK		 3908
3909 for (i = 0; i < db_count; i++) {
70bbb3e0 3910 block = descriptor_loc(sb, logical_sb_block, i);
a8ac900b 3911 sbi->s_group_desc[i] = sb_bread_unmovable(sb, block);
ac27a0ec 3912 if (!sbi->s_group_desc[i]) {
b31e1552
ES		 3913 ext4_msg(sb, KERN_ERR,
3914 "can't read group descriptor %d", i);
ac27a0ec
DK		 3915 db_count = i;
3916 goto failed_mount2;
3917 }
3918 }
bfff6873 3919 if (!ext4_check_descriptors(sb, &first_not_zeroed)) {
b31e1552 3920 ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
f9ae9cf5 3921 goto failed_mount2;
ac27a0ec 3922 }
772cb7c8 3923
f9ae9cf5 3924 sbi->s_gdb_count = db_count;
ac27a0ec
DK		 3925 get_random_bytes(&sbi->s_next_generation, sizeof(u32));
3926 spin_lock_init(&sbi->s_next_gen_lock);
3927
04496411
TM		 3928 init_timer(&sbi->s_err_report);
3929 sbi->s_err_report.function = print_daily_error_info;
3930 sbi->s_err_report.data = (unsigned long) sb;
3931
a75ae78f 3932 /* Register extent status tree shrinker */
eb68d0e2 3933 if (ext4_es_register_shrinker(sbi))
ce7e010a 3934 goto failed_mount3;
ce7e010a 3935
c9de560d 3936 sbi->s_stripe = ext4_get_stripe_size(sbi);
67a5da56 3937 sbi->s_extent_max_zeroout_kb = 32;
c9de560d 3938
f9ae9cf5
TT		 3939 /*
3940 * set up enough so that it can read an inode
3941 */
3942 if (!test_opt(sb, NOLOAD) &&
3943 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
3944 sb->s_op = &ext4_sops;
3945 else
3946 sb->s_op = &ext4_nojournal_sops;
617ba13b
MC		 3947 sb->s_export_op = &ext4_export_ops;
3948 sb->s_xattr = ext4_xattr_handlers;
ac27a0ec 3949#ifdef CONFIG_QUOTA
617ba13b 3950 sb->dq_op = &ext4_quota_operations;
262b4662 3951 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA))
7c319d32 3952 sb->s_qcop = &ext4_qctl_sysfile_operations;
262b4662
JK		 3953 else
3954 sb->s_qcop = &ext4_qctl_operations;
ac27a0ec 3955#endif
f2fa2ffc
AK		 3956 memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
3957
ac27a0ec 3958 INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
3b9d4ed2 3959 mutex_init(&sbi->s_orphan_lock);
ac27a0ec
DK		 3960
3961 sb->s_root = NULL;
3962
3963 needs_recovery = (es->s_last_orphan != 0 ||
617ba13b
MC		 3964 EXT4_HAS_INCOMPAT_FEATURE(sb,
3965 EXT4_FEATURE_INCOMPAT_RECOVER));
ac27a0ec 3966
c5e06d10
JL		 3967 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_MMP) &&
3968 !(sb->s_flags & MS_RDONLY))
3969 if (ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block)))
3970 goto failed_mount3;
3971
ac27a0ec
DK		 3972 /*
3973 * The first inode we look at is the journal inode. Don't try
3974 * root first: it may be modified in the journal!
3975 */
3976 if (!test_opt(sb, NOLOAD) &&
617ba13b
MC		 3977 EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
3978 if (ext4_load_journal(sb, es, journal_devnum))
ac27a0ec 3979 goto failed_mount3;
0390131b
FM		 3980 } else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) &&
3981 EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
b31e1552
ES		 3982 ext4_msg(sb, KERN_ERR, "required journal recovery "
3983 "suppressed and not mounted read-only");
744692dc 3984 goto failed_mount_wq;
ac27a0ec 3985 } else {
fd8c37ec 3986 clear_opt(sb, DATA_FLAGS);
0390131b
FM		 3987 sbi->s_journal = NULL;
3988 needs_recovery = 0;
3989 goto no_journal;
ac27a0ec
DK		 3990 }
3991
f32aaf2d 3992 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT) &&
eb40a09c
JS		 3993 !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
3994 JBD2_FEATURE_INCOMPAT_64BIT)) {
b31e1552 3995 ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
744692dc 3996 goto failed_mount_wq;
eb40a09c
JS		 3997 }
3998
25ed6e8a
DW		 3999 if (!set_journal_csum_feature_set(sb)) {
4000 ext4_msg(sb, KERN_ERR, "Failed to set journal checksum "
4001 "feature set");
4002 goto failed_mount_wq;
d4da6c9c 4003 }
818d276c 4004
ac27a0ec
DK		 4005 /* We have now updated the journal if required, so we can
4006 * validate the data journaling mode. */
4007 switch (test_opt(sb, DATA_FLAGS)) {
4008 case 0:
4009 /* No mode set, assume a default based on the journal
63f57933
AM		 4010 * capabilities: ORDERED_DATA if the journal can
4011 * cope, else JOURNAL_DATA
4012 */
dab291af
MC		 4013 if (jbd2_journal_check_available_features
4014 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
fd8c37ec 4015 set_opt(sb, ORDERED_DATA);
ac27a0ec 4016 else
fd8c37ec 4017 set_opt(sb, JOURNAL_DATA);
ac27a0ec
DK		 4018 break;
4019
617ba13b
MC		 4020 case EXT4_MOUNT_ORDERED_DATA:
4021 case EXT4_MOUNT_WRITEBACK_DATA:
dab291af
MC		 4022 if (!jbd2_journal_check_available_features
4023 (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
b31e1552
ES		 4024 ext4_msg(sb, KERN_ERR, "Journal does not support "
4025 "requested data journaling mode");
744692dc 4026 goto failed_mount_wq;
ac27a0ec
DK		 4027 }
4028 default:
4029 break;
4030 }
b3881f74 4031 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
ac27a0ec 4032
18aadd47
BJ		 4033 sbi->s_journal->j_commit_callback = ext4_journal_commit_callback;
4034
ce7e010a 4035no_journal:
9c191f70
M		 4036 if (ext4_mballoc_ready) {
4037 sbi->s_mb_cache = ext4_xattr_create_cache(sb->s_id);
4038 if (!sbi->s_mb_cache) {
4039 ext4_msg(sb, KERN_ERR, "Failed to create an mb_cache");
4040 goto failed_mount_wq;
4041 }
4042 }
4043
952fc18e
TT		 4044 /*
4045 * Get the # of file system overhead blocks from the
4046 * superblock if present.
4047 */
4048 if (es->s_overhead_clusters)
4049 sbi->s_overhead = le32_to_cpu(es->s_overhead_clusters);
4050 else {
07aa2ea1
LC		 4051 err = ext4_calculate_overhead(sb);
4052 if (err)
952fc18e
TT		 4053 goto failed_mount_wq;
4054 }
4055
fd89d5f2
TH		 4056 /*
4057 * The maximum number of concurrent works can be high and
4058 * concurrency isn't really necessary. Limit it to 1.
4059 */
2e8fa54e
JK		 4060 EXT4_SB(sb)->rsv_conversion_wq =
4061 alloc_workqueue("ext4-rsv-conversion", WQ_MEM_RECLAIM | WQ_UNBOUND, 1);
4062 if (!EXT4_SB(sb)->rsv_conversion_wq) {
4063 printk(KERN_ERR "EXT4-fs: failed to create workqueue\n");
07aa2ea1 4064 ret = -ENOMEM;
2e8fa54e
JK		 4065 goto failed_mount4;
4066 }
4067
ac27a0ec 4068 /*
dab291af 4069 * The jbd2_journal_load will have done any necessary log recovery,
ac27a0ec
DK		 4070 * so we can safely mount the rest of the filesystem now.
4071 */
4072
1d1fe1ee
DH		 4073 root = ext4_iget(sb, EXT4_ROOT_INO);
4074 if (IS_ERR(root)) {
b31e1552 4075 ext4_msg(sb, KERN_ERR, "get root inode failed");
1d1fe1ee 4076 ret = PTR_ERR(root);
32a9bb57 4077 root = NULL;
ac27a0ec
DK		 4078 goto failed_mount4;
4079 }
4080 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
b31e1552 4081 ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
94bf608a 4082 iput(root);
ac27a0ec
DK		 4083 goto failed_mount4;
4084 }
48fde701 4085 sb->s_root = d_make_root(root);
1d1fe1ee 4086 if (!sb->s_root) {
b31e1552 4087 ext4_msg(sb, KERN_ERR, "get root dentry failed");
1d1fe1ee
DH		 4088 ret = -ENOMEM;
4089 goto failed_mount4;
4090 }
ac27a0ec 4091
7e84b621
ES		 4092 if (ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY))
4093 sb->s_flags |= MS_RDONLY;
ef7f3835
KS		 4094
4095 /* determine the minimum size of new large inodes, if present */
4096 if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
4097 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
4098 EXT4_GOOD_OLD_INODE_SIZE;
4099 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
4100 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) {
4101 if (sbi->s_want_extra_isize <
4102 le16_to_cpu(es->s_want_extra_isize))
4103 sbi->s_want_extra_isize =
4104 le16_to_cpu(es->s_want_extra_isize);
4105 if (sbi->s_want_extra_isize <
4106 le16_to_cpu(es->s_min_extra_isize))
4107 sbi->s_want_extra_isize =
4108 le16_to_cpu(es->s_min_extra_isize);
4109 }
4110 }
4111 /* Check if enough inode space is available */
4112 if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
4113 sbi->s_inode_size) {
4114 sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
4115 EXT4_GOOD_OLD_INODE_SIZE;
b31e1552
ES		 4116 ext4_msg(sb, KERN_INFO, "required extra inode space not"
4117 "available");
ef7f3835
KS		 4118 }
4119
30fac0f7 4120 err = ext4_reserve_clusters(sbi, ext4_calculate_resv_clusters(sb));
27dd4385
LC		 4121 if (err) {
4122 ext4_msg(sb, KERN_ERR, "failed to reserve %llu clusters for "
30fac0f7 4123 "reserved pool", ext4_calculate_resv_clusters(sb));
f9ae9cf5 4124 goto failed_mount4a;
27dd4385
LC		 4125 }
4126
6fd058f7
TT		 4127 err = ext4_setup_system_zone(sb);
4128 if (err) {
b31e1552 4129 ext4_msg(sb, KERN_ERR, "failed to initialize system "
fbe845dd 4130 "zone (%d)", err);
f9ae9cf5
TT		 4131 goto failed_mount4a;
4132 }
4133
4134 ext4_ext_init(sb);
4135 err = ext4_mb_init(sb);
4136 if (err) {
4137 ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)",
4138 err);
dcf2d804 4139 goto failed_mount5;
c2774d84
AK		 4140 }
4141
d5e03cbb
TT		 4142 block = ext4_count_free_clusters(sb);
4143 ext4_free_blocks_count_set(sbi->s_es,
4144 EXT4_C2B(sbi, block));
4145 err = percpu_counter_init(&sbi->s_freeclusters_counter, block);
4146 if (!err) {
4147 unsigned long freei = ext4_count_free_inodes(sb);
4148 sbi->s_es->s_free_inodes_count = cpu_to_le32(freei);
4149 err = percpu_counter_init(&sbi->s_freeinodes_counter, freei);
4150 }
4151 if (!err)
4152 err = percpu_counter_init(&sbi->s_dirs_counter,
4153 ext4_count_dirs(sb));
4154 if (!err)
4155 err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0);
4156 if (err) {
4157 ext4_msg(sb, KERN_ERR, "insufficient memory");
4158 goto failed_mount6;
4159 }
4160
4161 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
4162 if (!ext4_fill_flex_info(sb)) {
4163 ext4_msg(sb, KERN_ERR,
4164 "unable to initialize "
4165 "flex_bg meta info!");
4166 goto failed_mount6;
4167 }
4168
bfff6873
LC		 4169 err = ext4_register_li_request(sb, first_not_zeroed);
4170 if (err)
dcf2d804 4171 goto failed_mount6;
bfff6873 4172
3197ebdb
TT		 4173 sbi->s_kobj.kset = ext4_kset;
4174 init_completion(&sbi->s_kobj_unregister);
4175 err = kobject_init_and_add(&sbi->s_kobj, &ext4_ktype, NULL,
4176 "%s", sb->s_id);
dcf2d804
TM		 4177 if (err)
4178 goto failed_mount7;
3197ebdb 4179
9b2ff357
JK		 4180#ifdef CONFIG_QUOTA
4181 /* Enable quota usage during mount. */
4182 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) &&
4183 !(sb->s_flags & MS_RDONLY)) {
4184 err = ext4_enable_quotas(sb);
4185 if (err)
4186 goto failed_mount8;
4187 }
4188#endif /* CONFIG_QUOTA */
4189
617ba13b
MC		 4190 EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
4191 ext4_orphan_cleanup(sb, es);
4192 EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
0390131b 4193 if (needs_recovery) {
b31e1552 4194 ext4_msg(sb, KERN_INFO, "recovery complete");
0390131b
FM		 4195 ext4_mark_recovery_complete(sb, es);
4196 }
4197 if (EXT4_SB(sb)->s_journal) {
4198 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
4199 descr = " journalled data mode";
4200 else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
4201 descr = " ordered data mode";
4202 else
4203 descr = " writeback data mode";
4204 } else
4205 descr = "out journal";
4206
79add3a3
LC		 4207 if (test_opt(sb, DISCARD)) {
4208 struct request_queue *q = bdev_get_queue(sb->s_bdev);
4209 if (!blk_queue_discard(q))
4210 ext4_msg(sb, KERN_WARNING,
4211 "mounting with \"discard\" option, but "
4212 "the device does not support discard");
4213 }
4214
d4c402d9 4215 ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. "
8b67f04a
TT		 4216 "Opts: %s%s%s", descr, sbi->s_es->s_mount_opts,
4217 *sbi->s_es->s_mount_opts ? "; " : "", orig_data);
ac27a0ec 4218
66e61a9e
TT		 4219 if (es->s_error_count)
4220 mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */
ac27a0ec 4221
efbed4dc
TT		 4222 /* Enable message ratelimiting. Default is 10 messages per 5 secs. */
4223 ratelimit_state_init(&sbi->s_err_ratelimit_state, 5 * HZ, 10);
4224 ratelimit_state_init(&sbi->s_warning_ratelimit_state, 5 * HZ, 10);
4225 ratelimit_state_init(&sbi->s_msg_ratelimit_state, 5 * HZ, 10);
4226
d4c402d9 4227 kfree(orig_data);
ac27a0ec
DK		 4228 return 0;
4229
617ba13b 4230cantfind_ext4:
ac27a0ec 4231 if (!silent)
b31e1552 4232 ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
ac27a0ec
DK		 4233 goto failed_mount;
4234
72ba7450
TT		 4235#ifdef CONFIG_QUOTA
4236failed_mount8:
4237 kobject_del(&sbi->s_kobj);
4238#endif
dcf2d804
TM		 4239failed_mount7:
4240 ext4_unregister_li_request(sb);
4241failed_mount6:
f9ae9cf5 4242 ext4_mb_release(sb);
d5e03cbb
TT		 4243 if (sbi->s_flex_groups)
4244 ext4_kvfree(sbi->s_flex_groups);
4245 percpu_counter_destroy(&sbi->s_freeclusters_counter);
4246 percpu_counter_destroy(&sbi->s_freeinodes_counter);
4247 percpu_counter_destroy(&sbi->s_dirs_counter);
4248 percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
00764937 4249failed_mount5:
f9ae9cf5
TT		 4250 ext4_ext_release(sb);
4251 ext4_release_system_zone(sb);
4252failed_mount4a:
94bf608a 4253 dput(sb->s_root);
32a9bb57 4254 sb->s_root = NULL;
94bf608a 4255failed_mount4:
b31e1552 4256 ext4_msg(sb, KERN_ERR, "mount failed");
2e8fa54e
JK		 4257 if (EXT4_SB(sb)->rsv_conversion_wq)
4258 destroy_workqueue(EXT4_SB(sb)->rsv_conversion_wq);
4c0425ff 4259failed_mount_wq:
0390131b
FM		 4260 if (sbi->s_journal) {
4261 jbd2_journal_destroy(sbi->s_journal);
4262 sbi->s_journal = NULL;
4263 }
d3922a77 4264 ext4_es_unregister_shrinker(sbi);
eb68d0e2 4265failed_mount3:
9105bb14 4266 del_timer_sync(&sbi->s_err_report);
c5e06d10
JL		 4267 if (sbi->s_mmp_tsk)
4268 kthread_stop(sbi->s_mmp_tsk);
ac27a0ec
DK		 4269failed_mount2:
4270 for (i = 0; i < db_count; i++)
4271 brelse(sbi->s_group_desc[i]);
f18a5f21 4272 ext4_kvfree(sbi->s_group_desc);
ac27a0ec 4273failed_mount:
0441984a
DW		 4274 if (sbi->s_chksum_driver)
4275 crypto_free_shash(sbi->s_chksum_driver);
240799cd 4276 if (sbi->s_proc) {
66acdcf4 4277 remove_proc_entry("options", sbi->s_proc);
9f6200bb 4278 remove_proc_entry(sb->s_id, ext4_proc_root);
240799cd 4279 }
ac27a0ec 4280#ifdef CONFIG_QUOTA
a2d4a646 4281 for (i = 0; i < EXT4_MAXQUOTAS; i++)
ac27a0ec
DK		 4282 kfree(sbi->s_qf_names[i]);
4283#endif
617ba13b 4284 ext4_blkdev_remove(sbi);
ac27a0ec
DK		 4285 brelse(bh);
4286out_fail:
4287 sb->s_fs_info = NULL;
f6830165 4288 kfree(sbi->s_blockgroup_lock);
ac27a0ec 4289 kfree(sbi);
dcc7dae3 4290out_free_orig:
d4c402d9 4291 kfree(orig_data);
07aa2ea1 4292 return err ? err : ret;
ac27a0ec
DK		 4293}
4294
4295/*
4296 * Setup any per-fs journal parameters now. We'll do this both on
4297 * initial mount, once the journal has been initialised but before we've
4298 * done any recovery; and again on any subsequent remount.
4299 */
617ba13b 4300static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
ac27a0ec 4301{
617ba13b 4302 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4303
30773840
TT		 4304 journal->j_commit_interval = sbi->s_commit_interval;
4305 journal->j_min_batch_time = sbi->s_min_batch_time;
4306 journal->j_max_batch_time = sbi->s_max_batch_time;
ac27a0ec 4307
a931da6a 4308 write_lock(&journal->j_state_lock);
ac27a0ec 4309 if (test_opt(sb, BARRIER))
dab291af 4310 journal->j_flags |= JBD2_BARRIER;
ac27a0ec 4311 else
dab291af 4312 journal->j_flags &= ~JBD2_BARRIER;
5bf5683a
HK		 4313 if (test_opt(sb, DATA_ERR_ABORT))
4314 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
4315 else
4316 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
a931da6a 4317 write_unlock(&journal->j_state_lock);
ac27a0ec
DK		 4318}
4319
617ba13b 4320static journal_t *ext4_get_journal(struct super_block *sb,
ac27a0ec
DK		 4321 unsigned int journal_inum)
4322{
4323 struct inode *journal_inode;
4324 journal_t *journal;
4325
0390131b
FM		 4326 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4327
ac27a0ec
DK		 4328 /* First, test for the existence of a valid inode on disk. Bad
4329 * things happen if we iget() an unused inode, as the subsequent
4330 * iput() will try to delete it. */
4331
1d1fe1ee
DH		 4332 journal_inode = ext4_iget(sb, journal_inum);
4333 if (IS_ERR(journal_inode)) {
b31e1552 4334 ext4_msg(sb, KERN_ERR, "no journal found");
ac27a0ec
DK		 4335 return NULL;
4336 }
4337 if (!journal_inode->i_nlink) {
4338 make_bad_inode(journal_inode);
4339 iput(journal_inode);
b31e1552 4340 ext4_msg(sb, KERN_ERR, "journal inode is deleted");
ac27a0ec
DK		 4341 return NULL;
4342 }
4343
e5f8eab8 4344 jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
ac27a0ec 4345 journal_inode, journal_inode->i_size);
1d1fe1ee 4346 if (!S_ISREG(journal_inode->i_mode)) {
b31e1552 4347 ext4_msg(sb, KERN_ERR, "invalid journal inode");
ac27a0ec
DK		 4348 iput(journal_inode);
4349 return NULL;
4350 }
4351
dab291af 4352 journal = jbd2_journal_init_inode(journal_inode);
ac27a0ec 4353 if (!journal) {
b31e1552 4354 ext4_msg(sb, KERN_ERR, "Could not load journal inode");
ac27a0ec
DK		 4355 iput(journal_inode);
4356 return NULL;
4357 }
4358 journal->j_private = sb;
617ba13b 4359 ext4_init_journal_params(sb, journal);
ac27a0ec
DK		 4360 return journal;
4361}
4362
617ba13b 4363static journal_t *ext4_get_dev_journal(struct super_block *sb,
ac27a0ec
DK		 4364 dev_t j_dev)
4365{
2b2d6d01 4366 struct buffer_head *bh;
ac27a0ec 4367 journal_t *journal;
617ba13b
MC		 4368 ext4_fsblk_t start;
4369 ext4_fsblk_t len;
ac27a0ec 4370 int hblock, blocksize;
617ba13b 4371 ext4_fsblk_t sb_block;
ac27a0ec 4372 unsigned long offset;
2b2d6d01 4373 struct ext4_super_block *es;
ac27a0ec
DK		 4374 struct block_device *bdev;
4375
0390131b
FM		 4376 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4377
b31e1552 4378 bdev = ext4_blkdev_get(j_dev, sb);
ac27a0ec
DK		 4379 if (bdev == NULL)
4380 return NULL;
4381
ac27a0ec 4382 blocksize = sb->s_blocksize;
e1defc4f 4383 hblock = bdev_logical_block_size(bdev);
ac27a0ec 4384 if (blocksize < hblock) {
b31e1552
ES		 4385 ext4_msg(sb, KERN_ERR,
4386 "blocksize too small for journal device");
ac27a0ec
DK		 4387 goto out_bdev;
4388 }
4389
617ba13b
MC		 4390 sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
4391 offset = EXT4_MIN_BLOCK_SIZE % blocksize;
ac27a0ec
DK		 4392 set_blocksize(bdev, blocksize);
4393 if (!(bh = __bread(bdev, sb_block, blocksize))) {
b31e1552
ES		 4394 ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
4395 "external journal");
ac27a0ec
DK		 4396 goto out_bdev;
4397 }
4398
2716b802 4399 es = (struct ext4_super_block *) (bh->b_data + offset);
617ba13b 4400 if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
ac27a0ec 4401 !(le32_to_cpu(es->s_feature_incompat) &
617ba13b 4402 EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
b31e1552
ES		 4403 ext4_msg(sb, KERN_ERR, "external journal has "
4404 "bad superblock");
ac27a0ec
DK		 4405 brelse(bh);
4406 goto out_bdev;
4407 }
4408
df4763be
DW		 4409 if ((le32_to_cpu(es->s_feature_ro_compat) &
4410 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) &&
4411 es->s_checksum != ext4_superblock_csum(sb, es)) {
4412 ext4_msg(sb, KERN_ERR, "external journal has "
4413 "corrupt superblock");
4414 brelse(bh);
4415 goto out_bdev;
4416 }
4417
617ba13b 4418 if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
b31e1552 4419 ext4_msg(sb, KERN_ERR, "journal UUID does not match");
ac27a0ec
DK		 4420 brelse(bh);
4421 goto out_bdev;
4422 }
4423
bd81d8ee 4424 len = ext4_blocks_count(es);
ac27a0ec
DK		 4425 start = sb_block + 1;
4426 brelse(bh); /* we're done with the superblock */
4427
dab291af 4428 journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
ac27a0ec
DK		 4429 start, len, blocksize);
4430 if (!journal) {
b31e1552 4431 ext4_msg(sb, KERN_ERR, "failed to create device journal");
ac27a0ec
DK		 4432 goto out_bdev;
4433 }
4434 journal->j_private = sb;
9f203507 4435 ll_rw_block(READ | REQ_META | REQ_PRIO, 1, &journal->j_sb_buffer);
ac27a0ec
DK		 4436 wait_on_buffer(journal->j_sb_buffer);
4437 if (!buffer_uptodate(journal->j_sb_buffer)) {
b31e1552 4438 ext4_msg(sb, KERN_ERR, "I/O error on journal device");
ac27a0ec
DK		 4439 goto out_journal;
4440 }
4441 if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
b31e1552
ES		 4442 ext4_msg(sb, KERN_ERR, "External journal has more than one "
4443 "user (unsupported) - %d",
ac27a0ec
DK		 4444 be32_to_cpu(journal->j_superblock->s_nr_users));
4445 goto out_journal;
4446 }
617ba13b
MC		 4447 EXT4_SB(sb)->journal_bdev = bdev;
4448 ext4_init_journal_params(sb, journal);
ac27a0ec 4449 return journal;
0b8e58a1 4450
ac27a0ec 4451out_journal:
dab291af 4452 jbd2_journal_destroy(journal);
ac27a0ec 4453out_bdev:
617ba13b 4454 ext4_blkdev_put(bdev);
ac27a0ec
DK		 4455 return NULL;
4456}
4457
617ba13b
MC		 4458static int ext4_load_journal(struct super_block *sb,
4459 struct ext4_super_block *es,
ac27a0ec
DK		 4460 unsigned long journal_devnum)
4461{
4462 journal_t *journal;
4463 unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
4464 dev_t journal_dev;
4465 int err = 0;
4466 int really_read_only;
4467
0390131b
FM		 4468 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4469
ac27a0ec
DK		 4470 if (journal_devnum &&
4471 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
b31e1552
ES		 4472 ext4_msg(sb, KERN_INFO, "external journal device major/minor "
4473 "numbers have changed");
ac27a0ec
DK		 4474 journal_dev = new_decode_dev(journal_devnum);
4475 } else
4476 journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));
4477
4478 really_read_only = bdev_read_only(sb->s_bdev);
4479
4480 /*
4481 * Are we loading a blank journal or performing recovery after a
4482 * crash? For recovery, we need to check in advance whether we
4483 * can get read-write access to the device.
4484 */
617ba13b 4485 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
ac27a0ec 4486 if (sb->s_flags & MS_RDONLY) {
b31e1552
ES		 4487 ext4_msg(sb, KERN_INFO, "INFO: recovery "
4488 "required on readonly filesystem");
ac27a0ec 4489 if (really_read_only) {
b31e1552
ES		 4490 ext4_msg(sb, KERN_ERR, "write access "
4491 "unavailable, cannot proceed");
ac27a0ec
DK		 4492 return -EROFS;
4493 }
b31e1552
ES		 4494 ext4_msg(sb, KERN_INFO, "write access will "
4495 "be enabled during recovery");
ac27a0ec
DK		 4496 }
4497 }
4498
4499 if (journal_inum && journal_dev) {
b31e1552
ES		 4500 ext4_msg(sb, KERN_ERR, "filesystem has both journal "
4501 "and inode journals!");
ac27a0ec
DK		 4502 return -EINVAL;
4503 }
4504
4505 if (journal_inum) {
617ba13b 4506 if (!(journal = ext4_get_journal(sb, journal_inum)))
ac27a0ec
DK		 4507 return -EINVAL;
4508 } else {
617ba13b 4509 if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
ac27a0ec
DK		 4510 return -EINVAL;
4511 }
4512
90576c0b 4513 if (!(journal->j_flags & JBD2_BARRIER))
b31e1552 4514 ext4_msg(sb, KERN_INFO, "barriers disabled");
4776004f 4515
617ba13b 4516 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER))
dab291af 4517 err = jbd2_journal_wipe(journal, !really_read_only);
1c13d5c0
TT		 4518 if (!err) {
4519 char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL);
4520 if (save)
4521 memcpy(save, ((char *) es) +
4522 EXT4_S_ERR_START, EXT4_S_ERR_LEN);
dab291af 4523 err = jbd2_journal_load(journal);
1c13d5c0
TT		 4524 if (save)
4525 memcpy(((char *) es) + EXT4_S_ERR_START,
4526 save, EXT4_S_ERR_LEN);
4527 kfree(save);
4528 }
ac27a0ec
DK		 4529
4530 if (err) {
b31e1552 4531 ext4_msg(sb, KERN_ERR, "error loading journal");
dab291af 4532 jbd2_journal_destroy(journal);
ac27a0ec
DK		 4533 return err;
4534 }
4535
617ba13b
MC		 4536 EXT4_SB(sb)->s_journal = journal;
4537 ext4_clear_journal_err(sb, es);
ac27a0ec 4538
c41303ce 4539 if (!really_read_only && journal_devnum &&
ac27a0ec
DK		 4540 journal_devnum != le32_to_cpu(es->s_journal_dev)) {
4541 es->s_journal_dev = cpu_to_le32(journal_devnum);
ac27a0ec
DK		 4542
4543 /* Make sure we flush the recovery flag to disk. */
e2d67052 4544 ext4_commit_super(sb, 1);
ac27a0ec
DK		 4545 }
4546
4547 return 0;
4548}
4549
e2d67052 4550static int ext4_commit_super(struct super_block *sb, int sync)
ac27a0ec 4551{
e2d67052 4552 struct ext4_super_block *es = EXT4_SB(sb)->s_es;
617ba13b 4553 struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
c4be0c1d 4554 int error = 0;
ac27a0ec 4555
7c2e7087 4556 if (!sbh || block_device_ejected(sb))
c4be0c1d 4557 return error;
914258bf
TT		 4558 if (buffer_write_io_error(sbh)) {
4559 /*
4560 * Oh, dear. A previous attempt to write the
4561 * superblock failed. This could happen because the
4562 * USB device was yanked out. Or it could happen to
4563 * be a transient write error and maybe the block will
4564 * be remapped. Nothing we can do but to retry the
4565 * write and hope for the best.
4566 */
b31e1552
ES		 4567 ext4_msg(sb, KERN_ERR, "previous I/O error to "
4568 "superblock detected");
914258bf
TT		 4569 clear_buffer_write_io_error(sbh);
4570 set_buffer_uptodate(sbh);
4571 }
71290b36
TT		 4572 /*
4573 * If the file system is mounted read-only, don't update the
4574 * superblock write time. This avoids updating the superblock
4575 * write time when we are mounting the root file system
4576 * read/only but we need to replay the journal; at that point,
4577 * for people who are east of GMT and who make their clock
4578 * tick in localtime for Windows bug-for-bug compatibility,
4579 * the clock is set in the future, and this will cause e2fsck
4580 * to complain and force a full file system check.
4581 */
4582 if (!(sb->s_flags & MS_RDONLY))
4583 es->s_wtime = cpu_to_le32(get_seconds());
f613dfcb
TT		 4584 if (sb->s_bdev->bd_part)
4585 es->s_kbytes_written =
4586 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written +
afc32f7e
TT		 4587 ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
4588 EXT4_SB(sb)->s_sectors_written_start) >> 1));
f613dfcb
TT		 4589 else
4590 es->s_kbytes_written =
4591 cpu_to_le64(EXT4_SB(sb)->s_kbytes_written);
d5e03cbb
TT		 4592 if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeclusters_counter))
4593 ext4_free_blocks_count_set(es,
57042651
TT		 4594 EXT4_C2B(EXT4_SB(sb), percpu_counter_sum_positive(
4595 &EXT4_SB(sb)->s_freeclusters_counter)));
d5e03cbb
TT		 4596 if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeinodes_counter))
4597 es->s_free_inodes_count =
4598 cpu_to_le32(percpu_counter_sum_positive(
ce7e010a 4599 &EXT4_SB(sb)->s_freeinodes_counter));
ac27a0ec 4600 BUFFER_TRACE(sbh, "marking dirty");
06db49e6 4601 ext4_superblock_csum_set(sb);
ac27a0ec 4602 mark_buffer_dirty(sbh);
914258bf 4603 if (sync) {
c4be0c1d
TS		 4604 error = sync_dirty_buffer(sbh);
4605 if (error)
4606 return error;
4607
4608 error = buffer_write_io_error(sbh);
4609 if (error) {
b31e1552
ES		 4610 ext4_msg(sb, KERN_ERR, "I/O error while writing "
4611 "superblock");
914258bf
TT		 4612 clear_buffer_write_io_error(sbh);
4613 set_buffer_uptodate(sbh);
4614 }
4615 }
c4be0c1d 4616 return error;
ac27a0ec
DK		 4617}
4618
ac27a0ec
DK		 4619/*
4620 * Have we just finished recovery? If so, and if we are mounting (or
4621 * remounting) the filesystem readonly, then we will end up with a
4622 * consistent fs on disk. Record that fact.
4623 */
2b2d6d01
TT		 4624static void ext4_mark_recovery_complete(struct super_block *sb,
4625 struct ext4_super_block *es)
ac27a0ec 4626{
617ba13b 4627 journal_t *journal = EXT4_SB(sb)->s_journal;
ac27a0ec 4628
0390131b
FM		 4629 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
4630 BUG_ON(journal != NULL);
4631 return;
4632 }
dab291af 4633 jbd2_journal_lock_updates(journal);
7ffe1ea8
HK		 4634 if (jbd2_journal_flush(journal) < 0)
4635 goto out;
4636
617ba13b 4637 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
ac27a0ec 4638 sb->s_flags & MS_RDONLY) {
617ba13b 4639 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
e2d67052 4640 ext4_commit_super(sb, 1);
ac27a0ec 4641 }
7ffe1ea8
HK		 4642
4643out:
dab291af 4644 jbd2_journal_unlock_updates(journal);
ac27a0ec
DK		 4645}
4646
4647/*
4648 * If we are mounting (or read-write remounting) a filesystem whose journal
4649 * has recorded an error from a previous lifetime, move that error to the
4650 * main filesystem now.
4651 */
2b2d6d01
TT		 4652static void ext4_clear_journal_err(struct super_block *sb,
4653 struct ext4_super_block *es)
ac27a0ec
DK		 4654{
4655 journal_t *journal;
4656 int j_errno;
4657 const char *errstr;
4658
0390131b
FM		 4659 BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL));
4660
617ba13b 4661 journal = EXT4_SB(sb)->s_journal;
ac27a0ec
DK		 4662
4663 /*
4664 * Now check for any error status which may have been recorded in the
617ba13b 4665 * journal by a prior ext4_error() or ext4_abort()
ac27a0ec
DK		 4666 */
4667
dab291af 4668 j_errno = jbd2_journal_errno(journal);
ac27a0ec
DK		 4669 if (j_errno) {
4670 char nbuf[16];
4671
617ba13b 4672 errstr = ext4_decode_error(sb, j_errno, nbuf);
12062ddd 4673 ext4_warning(sb, "Filesystem error recorded "
ac27a0ec 4674 "from previous mount: %s", errstr);
12062ddd 4675 ext4_warning(sb, "Marking fs in need of filesystem check.");
ac27a0ec 4676
617ba13b
MC		 4677 EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
4678 es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
e2d67052 4679 ext4_commit_super(sb, 1);
ac27a0ec 4680
dab291af 4681 jbd2_journal_clear_err(journal);
d796c52e 4682 jbd2_journal_update_sb_errno(journal);
ac27a0ec
DK		 4683 }
4684}
4685
4686/*
4687 * Force the running and committing transactions to commit,
4688 * and wait on the commit.
4689 */
617ba13b 4690int ext4_force_commit(struct super_block *sb)
ac27a0ec
DK		 4691{
4692 journal_t *journal;
ac27a0ec
DK		 4693
4694 if (sb->s_flags & MS_RDONLY)
4695 return 0;
4696
617ba13b 4697 journal = EXT4_SB(sb)->s_journal;
b1deefc9 4698 return ext4_journal_force_commit(journal);
ac27a0ec
DK		 4699}
4700
617ba13b 4701static int ext4_sync_fs(struct super_block *sb, int wait)
ac27a0ec 4702{
14ce0cb4 4703 int ret = 0;
9eddacf9 4704 tid_t target;
06a407f1 4705 bool needs_barrier = false;
8d5d02e6 4706 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4707
9bffad1e 4708 trace_ext4_sync_fs(sb, wait);
2e8fa54e 4709 flush_workqueue(sbi->rsv_conversion_wq);
a1177825
JK		 4710 /*
4711 * Writeback quota in non-journalled quota case - journalled quota has
4712 * no dirty dquots
4713 */
4714 dquot_writeback_dquots(sb, -1);
06a407f1
DM		 4715 /*
4716 * Data writeback is possible w/o journal transaction, so barrier must
4717 * being sent at the end of the function. But we can skip it if
4718 * transaction_commit will do it for us.
4719 */
bda32530
TT		 4720 if (sbi->s_journal) {
4721 target = jbd2_get_latest_transaction(sbi->s_journal);
4722 if (wait && sbi->s_journal->j_flags & JBD2_BARRIER &&
4723 !jbd2_trans_will_send_data_barrier(sbi->s_journal, target))
4724 needs_barrier = true;
4725
4726 if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
4727 if (wait)
4728 ret = jbd2_log_wait_commit(sbi->s_journal,
4729 target);
4730 }
4731 } else if (wait && test_opt(sb, BARRIER))
06a407f1 4732 needs_barrier = true;
06a407f1
DM		 4733 if (needs_barrier) {
4734 int err;
4735 err = blkdev_issue_flush(sb->s_bdev, GFP_KERNEL, NULL);
4736 if (!ret)
4737 ret = err;
0390131b 4738 }
06a407f1 4739
14ce0cb4 4740 return ret;
ac27a0ec
DK		 4741}
4742
4743/*
4744 * LVM calls this function before a (read-only) snapshot is created. This
4745 * gives us a chance to flush the journal completely and mark the fs clean.
be4f27d3
YY		 4746 *
4747 * Note that only this function cannot bring a filesystem to be in a clean
8e8ad8a5
JK		 4748 * state independently. It relies on upper layer to stop all data & metadata
4749 * modifications.
ac27a0ec 4750 */
c4be0c1d 4751static int ext4_freeze(struct super_block *sb)
ac27a0ec 4752{
c4be0c1d
TS		 4753 int error = 0;
4754 journal_t *journal;
ac27a0ec 4755
9ca92389
TT		 4756 if (sb->s_flags & MS_RDONLY)
4757 return 0;
ac27a0ec 4758
9ca92389 4759 journal = EXT4_SB(sb)->s_journal;
7ffe1ea8 4760
9ca92389
TT		 4761 /* Now we set up the journal barrier. */
4762 jbd2_journal_lock_updates(journal);
ac27a0ec 4763
9ca92389
TT		 4764 /*
4765 * Don't clear the needs_recovery flag if we failed to flush
4766 * the journal.
4767 */
4768 error = jbd2_journal_flush(journal);
6b0310fb
ES		 4769 if (error < 0)
4770 goto out;
9ca92389
TT		 4771
4772 /* Journal blocked and flushed, clear needs_recovery flag. */
4773 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4774 error = ext4_commit_super(sb, 1);
6b0310fb 4775out:
8e8ad8a5 4776 /* we rely on upper layer to stop further updates */
6b0310fb
ES		 4777 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
4778 return error;
ac27a0ec
DK		 4779}
4780
4781/*
4782 * Called by LVM after the snapshot is done. We need to reset the RECOVER
4783 * flag here, even though the filesystem is not technically dirty yet.
4784 */
c4be0c1d 4785static int ext4_unfreeze(struct super_block *sb)
ac27a0ec 4786{
9ca92389
TT		 4787 if (sb->s_flags & MS_RDONLY)
4788 return 0;
4789
9ca92389
TT		 4790 /* Reset the needs_recovery flag before the fs is unlocked. */
4791 EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
4792 ext4_commit_super(sb, 1);
c4be0c1d 4793 return 0;
ac27a0ec
DK		 4794}
4795
673c6100
TT		 4796/*
4797 * Structure to save mount options for ext4_remount's benefit
4798 */
4799struct ext4_mount_options {
4800 unsigned long s_mount_opt;
a2595b8a 4801 unsigned long s_mount_opt2;
08cefc7a
EB		 4802 kuid_t s_resuid;
4803 kgid_t s_resgid;
673c6100
TT		 4804 unsigned long s_commit_interval;
4805 u32 s_min_batch_time, s_max_batch_time;
4806#ifdef CONFIG_QUOTA
4807 int s_jquota_fmt;
a2d4a646 4808 char *s_qf_names[EXT4_MAXQUOTAS];
673c6100
TT		 4809#endif
4810};
4811
2b2d6d01 4812static int ext4_remount(struct super_block *sb, int *flags, char *data)
ac27a0ec 4813{
2b2d6d01 4814 struct ext4_super_block *es;
617ba13b 4815 struct ext4_sb_info *sbi = EXT4_SB(sb);
ac27a0ec 4816 unsigned long old_sb_flags;
617ba13b 4817 struct ext4_mount_options old_opts;
c79d967d 4818 int enable_quota = 0;
8a266467 4819 ext4_group_t g;
b3881f74 4820 unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
c5e06d10 4821 int err = 0;
ac27a0ec 4822#ifdef CONFIG_QUOTA
03dafb5f 4823 int i, j;
ac27a0ec 4824#endif
d4c402d9 4825 char *orig_data = kstrdup(data, GFP_KERNEL);
ac27a0ec
DK		 4826
4827 /* Store the original options */
4828 old_sb_flags = sb->s_flags;
4829 old_opts.s_mount_opt = sbi->s_mount_opt;
a2595b8a 4830 old_opts.s_mount_opt2 = sbi->s_mount_opt2;
ac27a0ec
DK		 4831 old_opts.s_resuid = sbi->s_resuid;
4832 old_opts.s_resgid = sbi->s_resgid;
4833 old_opts.s_commit_interval = sbi->s_commit_interval;
30773840
TT		 4834 old_opts.s_min_batch_time = sbi->s_min_batch_time;
4835 old_opts.s_max_batch_time = sbi->s_max_batch_time;
ac27a0ec
DK		 4836#ifdef CONFIG_QUOTA
4837 old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
a2d4a646 4838 for (i = 0; i < EXT4_MAXQUOTAS; i++)
03dafb5f
CG		 4839 if (sbi->s_qf_names[i]) {
4840 old_opts.s_qf_names[i] = kstrdup(sbi->s_qf_names[i],
4841 GFP_KERNEL);
4842 if (!old_opts.s_qf_names[i]) {
4843 for (j = 0; j < i; j++)
4844 kfree(old_opts.s_qf_names[j]);
3e36a163 4845 kfree(orig_data);
03dafb5f
CG		 4846 return -ENOMEM;
4847 }
4848 } else
4849 old_opts.s_qf_names[i] = NULL;
ac27a0ec 4850#endif
b3881f74
TT		 4851 if (sbi->s_journal && sbi->s_journal->j_task->io_context)
4852 journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
ac27a0ec
DK		 4853
4854 /*
4855 * Allow the "check" option to be passed as a remount option.
4856 */
661aa520 4857 if (!parse_options(data, sb, NULL, &journal_ioprio, 1)) {
ac27a0ec
DK		 4858 err = -EINVAL;
4859 goto restore_opts;
4860 }
4861
6ae6514b
PS		 4862 if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
4863 if (test_opt2(sb, EXPLICIT_DELALLOC)) {
4864 ext4_msg(sb, KERN_ERR, "can't mount with "
4865 "both data=journal and delalloc");
4866 err = -EINVAL;
4867 goto restore_opts;
4868 }
4869 if (test_opt(sb, DIOREAD_NOLOCK)) {
4870 ext4_msg(sb, KERN_ERR, "can't mount with "
4871 "both data=journal and dioread_nolock");
4872 err = -EINVAL;
4873 goto restore_opts;
4874 }
4875 }
4876
4ab2f15b 4877 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
c67d859e 4878 ext4_abort(sb, "Abort forced by user");
ac27a0ec
DK		 4879
4880 sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
482a7425 4881 (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
ac27a0ec
DK		 4882
4883 es = sbi->s_es;
4884
b3881f74 4885 if (sbi->s_journal) {
0390131b 4886 ext4_init_journal_params(sb, sbi->s_journal);
b3881f74
TT		 4887 set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
4888 }
ac27a0ec 4889
661aa520 4890 if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
4ab2f15b 4891 if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) {
ac27a0ec
DK		 4892 err = -EROFS;
4893 goto restore_opts;
4894 }
4895
4896 if (*flags & MS_RDONLY) {
38c03b34
TT		 4897 err = sync_filesystem(sb);
4898 if (err < 0)
4899 goto restore_opts;
0f0dd62f
CH		 4900 err = dquot_suspend(sb, -1);
4901 if (err < 0)
c79d967d 4902 goto restore_opts;
c79d967d 4903
ac27a0ec
DK		 4904 /*
4905 * First of all, the unconditional stuff we have to do
4906 * to disable replay of the journal when we next remount
4907 */
4908 sb->s_flags |= MS_RDONLY;
4909
4910 /*
4911 * OK, test if we are remounting a valid rw partition
4912 * readonly, and if so set the rdonly flag and then
4913 * mark the partition as valid again.
4914 */
617ba13b
MC		 4915 if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
4916 (sbi->s_mount_state & EXT4_VALID_FS))
ac27a0ec
DK		 4917 es->s_state = cpu_to_le16(sbi->s_mount_state);
4918
a63c9eb2 4919 if (sbi->s_journal)
0390131b 4920 ext4_mark_recovery_complete(sb, es);
ac27a0ec 4921 } else {
a13fb1a4
ES		 4922 /* Make sure we can mount this feature set readwrite */
4923 if (!ext4_feature_set_ok(sb, 0)) {
ac27a0ec
DK		 4924 err = -EROFS;
4925 goto restore_opts;
4926 }
8a266467
TT		 4927 /*
4928 * Make sure the group descriptor checksums
0b8e58a1 4929 * are sane. If they aren't, refuse to remount r/w.
8a266467
TT		 4930 */
4931 for (g = 0; g < sbi->s_groups_count; g++) {
4932 struct ext4_group_desc *gdp =
4933 ext4_get_group_desc(sb, g, NULL);
4934
feb0ab32 4935 if (!ext4_group_desc_csum_verify(sb, g, gdp)) {
b31e1552
ES		 4936 ext4_msg(sb, KERN_ERR,
4937 "ext4_remount: Checksum for group %u failed (%u!=%u)",
8a266467
TT		 4938 g, le16_to_cpu(ext4_group_desc_csum(sbi, g, gdp)),
4939 le16_to_cpu(gdp->bg_checksum));
4940 err = -EINVAL;
4941 goto restore_opts;
4942 }
4943 }
4944
ead6596b
ES		 4945 /*
4946 * If we have an unprocessed orphan list hanging
4947 * around from a previously readonly bdev mount,
4948 * require a full umount/remount for now.
4949 */
4950 if (es->s_last_orphan) {
b31e1552 4951 ext4_msg(sb, KERN_WARNING, "Couldn't "
ead6596b
ES		 4952 "remount RDWR because of unprocessed "
4953 "orphan inode list. Please "
b31e1552 4954 "umount/remount instead");
ead6596b
ES		 4955 err = -EINVAL;
4956 goto restore_opts;
4957 }
4958
ac27a0ec
DK		 4959 /*
4960 * Mounting a RDONLY partition read-write, so reread
4961 * and store the current valid flag. (It may have
4962 * been changed by e2fsck since we originally mounted
4963 * the partition.)
4964 */
0390131b
FM		 4965 if (sbi->s_journal)
4966 ext4_clear_journal_err(sb, es);
ac27a0ec 4967 sbi->s_mount_state = le16_to_cpu(es->s_state);
2b2d6d01 4968 if (!ext4_setup_super(sb, es, 0))
ac27a0ec 4969 sb->s_flags &= ~MS_RDONLY;
c5e06d10
JL		 4970 if (EXT4_HAS_INCOMPAT_FEATURE(sb,
4971 EXT4_FEATURE_INCOMPAT_MMP))
4972 if (ext4_multi_mount_protect(sb,
4973 le64_to_cpu(es->s_mmp_block))) {
4974 err = -EROFS;
4975 goto restore_opts;
4976 }
c79d967d 4977 enable_quota = 1;
ac27a0ec
DK		 4978 }
4979 }
bfff6873
LC		 4980
4981 /*
4982 * Reinitialize lazy itable initialization thread based on
4983 * current settings
4984 */
4985 if ((sb->s_flags & MS_RDONLY) || !test_opt(sb, INIT_INODE_TABLE))
4986 ext4_unregister_li_request(sb);
4987 else {
4988 ext4_group_t first_not_zeroed;
4989 first_not_zeroed = ext4_has_uninit_itable(sb);
4990 ext4_register_li_request(sb, first_not_zeroed);
4991 }
4992
6fd058f7 4993 ext4_setup_system_zone(sb);
d096ad0f 4994 if (sbi->s_journal == NULL && !(old_sb_flags & MS_RDONLY))
e2d67052 4995 ext4_commit_super(sb, 1);
0390131b 4996
ac27a0ec
DK		 4997#ifdef CONFIG_QUOTA
4998 /* Release old quota file names */
a2d4a646 4999 for (i = 0; i < EXT4_MAXQUOTAS; i++)
03dafb5f 5000 kfree(old_opts.s_qf_names[i]);
7c319d32
AK		 5001 if (enable_quota) {
5002 if (sb_any_quota_suspended(sb))
5003 dquot_resume(sb, -1);
5004 else if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
5005 EXT4_FEATURE_RO_COMPAT_QUOTA)) {
5006 err = ext4_enable_quotas(sb);
07724f98 5007 if (err)
7c319d32 5008 goto restore_opts;
7c319d32
AK		 5009 }
5010 }
ac27a0ec 5011#endif
d4c402d9
CW		 5012
5013 ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s", orig_data);
5014 kfree(orig_data);
ac27a0ec 5015 return 0;
0b8e58a1 5016
ac27a0ec
DK		 5017restore_opts:
5018 sb->s_flags = old_sb_flags;
5019 sbi->s_mount_opt = old_opts.s_mount_opt;
a2595b8a 5020 sbi->s_mount_opt2 = old_opts.s_mount_opt2;
ac27a0ec
DK		 5021 sbi->s_resuid = old_opts.s_resuid;
5022 sbi->s_resgid = old_opts.s_resgid;
5023 sbi->s_commit_interval = old_opts.s_commit_interval;
30773840
TT		 5024 sbi->s_min_batch_time = old_opts.s_min_batch_time;
5025 sbi->s_max_batch_time = old_opts.s_max_batch_time;
ac27a0ec
DK		 5026#ifdef CONFIG_QUOTA
5027 sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
a2d4a646 5028 for (i = 0; i < EXT4_MAXQUOTAS; i++) {
03dafb5f 5029 kfree(sbi->s_qf_names[i]);
ac27a0ec
DK		 5030 sbi->s_qf_names[i] = old_opts.s_qf_names[i];
5031 }
5032#endif
d4c402d9 5033 kfree(orig_data);
ac27a0ec
DK		 5034 return err;
5035}
5036
2b2d6d01 5037static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
ac27a0ec
DK		 5038{
5039 struct super_block *sb = dentry->d_sb;
617ba13b
MC		 5040 struct ext4_sb_info *sbi = EXT4_SB(sb);
5041 struct ext4_super_block *es = sbi->s_es;
27dd4385 5042 ext4_fsblk_t overhead = 0, resv_blocks;
960cc398 5043 u64 fsid;
d02a9391 5044 s64 bfree;
27dd4385 5045 resv_blocks = EXT4_C2B(sbi, atomic64_read(&sbi->s_resv_clusters));
ac27a0ec 5046
952fc18e
TT		 5047 if (!test_opt(sb, MINIX_DF))
5048 overhead = sbi->s_overhead;
ac27a0ec 5049
617ba13b 5050 buf->f_type = EXT4_SUPER_MAGIC;
ac27a0ec 5051 buf->f_bsize = sb->s_blocksize;
b72f78cb 5052 buf->f_blocks = ext4_blocks_count(es) - EXT4_C2B(sbi, overhead);
57042651
TT		 5053 bfree = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) -
5054 percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter);
d02a9391 5055 /* prevent underflow in case that few free space is available */
57042651 5056 buf->f_bfree = EXT4_C2B(sbi, max_t(s64, bfree, 0));
27dd4385
LC		 5057 buf->f_bavail = buf->f_bfree -
5058 (ext4_r_blocks_count(es) + resv_blocks);
5059 if (buf->f_bfree < (ext4_r_blocks_count(es) + resv_blocks))
ac27a0ec
DK		 5060 buf->f_bavail = 0;
5061 buf->f_files = le32_to_cpu(es->s_inodes_count);
52d9f3b4 5062 buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
617ba13b 5063 buf->f_namelen = EXT4_NAME_LEN;
960cc398
PE		 5064 fsid = le64_to_cpup((void *)es->s_uuid) ^
5065 le64_to_cpup((void *)es->s_uuid + sizeof(u64));
5066 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
5067 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
0b8e58a1 5068
ac27a0ec
DK		 5069 return 0;
5070}
5071
0b8e58a1
AD		 5072/* Helper function for writing quotas on sync - we need to start transaction
5073 * before quota file is locked for write. Otherwise the are possible deadlocks:
ac27a0ec 5074 * Process 1 Process 2
617ba13b 5075 * ext4_create() quota_sync()
a269eb18 5076 * jbd2_journal_start() write_dquot()
871a2931 5077 * dquot_initialize() down(dqio_mutex)
dab291af 5078 * down(dqio_mutex) jbd2_journal_start()
ac27a0ec
DK		 5079 *
5080 */
5081
5082#ifdef CONFIG_QUOTA
5083
5084static inline struct inode *dquot_to_inode(struct dquot *dquot)
5085{
4c376dca 5086 return sb_dqopt(dquot->dq_sb)->files[dquot->dq_id.type];
ac27a0ec
DK		 5087}
5088
617ba13b 5089static int ext4_write_dquot(struct dquot *dquot)
ac27a0ec
DK		 5090{
5091 int ret, err;
5092 handle_t *handle;
5093 struct inode *inode;
5094
5095 inode = dquot_to_inode(dquot);
9924a92a 5096 handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
0b8e58a1 5097 EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 5098 if (IS_ERR(handle))
5099 return PTR_ERR(handle);
5100 ret = dquot_commit(dquot);
617ba13b 5101 err = ext4_journal_stop(handle);
ac27a0ec
DK		 5102 if (!ret)
5103 ret = err;
5104 return ret;
5105}
5106
617ba13b 5107static int ext4_acquire_dquot(struct dquot *dquot)
ac27a0ec
DK		 5108{
5109 int ret, err;
5110 handle_t *handle;
5111
9924a92a 5112 handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
0b8e58a1 5113 EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
ac27a0ec
DK		 5114 if (IS_ERR(handle))
5115 return PTR_ERR(handle);
5116 ret = dquot_acquire(dquot);
617ba13b 5117 err = ext4_journal_stop(handle);
ac27a0ec
DK		 5118 if (!ret)
5119 ret = err;
5120 return ret;
5121}
5122
617ba13b 5123static int ext4_release_dquot(struct dquot *dquot)
ac27a0ec
DK		 5124{
5125 int ret, err;
5126 handle_t *handle;
5127
9924a92a 5128 handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
0b8e58a1 5129 EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
9c3013e9
JK		 5130 if (IS_ERR(handle)) {
5131 /* Release dquot anyway to avoid endless cycle in dqput() */
5132 dquot_release(dquot);
ac27a0ec 5133 return PTR_ERR(handle);
9c3013e9 5134 }
ac27a0ec 5135 ret = dquot_release(dquot);
617ba13b 5136 err = ext4_journal_stop(handle);
ac27a0ec
DK		 5137 if (!ret)
5138 ret = err;
5139 return ret;
5140}
5141
617ba13b 5142static int ext4_mark_dquot_dirty(struct dquot *dquot)
ac27a0ec 5143{
262b4662
JK		 5144 struct super_block *sb = dquot->dq_sb;
5145 struct ext4_sb_info *sbi = EXT4_SB(sb);
5146
2c8be6b2 5147 /* Are we journaling quotas? */
262b4662
JK		 5148 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) ||
5149 sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
ac27a0ec 5150 dquot_mark_dquot_dirty(dquot);
617ba13b 5151 return ext4_write_dquot(dquot);
ac27a0ec
DK		 5152 } else {
5153 return dquot_mark_dquot_dirty(dquot);
5154 }
5155}
5156
617ba13b 5157static int ext4_write_info(struct super_block *sb, int type)
ac27a0ec
DK		 5158{
5159 int ret, err;
5160 handle_t *handle;
5161
5162 /* Data block + inode block */
9924a92a 5163 handle = ext4_journal_start(sb->s_root->d_inode, EXT4_HT_QUOTA, 2);
ac27a0ec
DK		 5164 if (IS_ERR(handle))
5165 return PTR_ERR(handle);
5166 ret = dquot_commit_info(sb, type);
617ba13b 5167 err = ext4_journal_stop(handle);
ac27a0ec
DK		 5168 if (!ret)
5169 ret = err;
5170 return ret;
5171}
5172
5173/*
5174 * Turn on quotas during mount time - we need to find
5175 * the quota file and such...
5176 */
617ba13b 5177static int ext4_quota_on_mount(struct super_block *sb, int type)
ac27a0ec 5178{
287a8095
CH		 5179 return dquot_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
5180 EXT4_SB(sb)->s_jquota_fmt, type);
ac27a0ec
DK		 5181}
5182
5183/*
5184 * Standard function to be called on quota_on
5185 */
617ba13b 5186static int ext4_quota_on(struct super_block *sb, int type, int format_id,
f00c9e44 5187 struct path *path)
ac27a0ec
DK		 5188{
5189 int err;
ac27a0ec
DK		 5190
5191 if (!test_opt(sb, QUOTA))
5192 return -EINVAL;
0623543b 5193
ac27a0ec 5194 /* Quotafile not on the same filesystem? */
d8c9584e 5195 if (path->dentry->d_sb != sb)
ac27a0ec 5196 return -EXDEV;
0623543b
JK		 5197 /* Journaling quota? */
5198 if (EXT4_SB(sb)->s_qf_names[type]) {
2b2d6d01 5199 /* Quotafile not in fs root? */
f00c9e44 5200 if (path->dentry->d_parent != sb->s_root)
b31e1552
ES		 5201 ext4_msg(sb, KERN_WARNING,
5202 "Quota file not on filesystem root. "
5203 "Journaled quota will not work");
2b2d6d01 5204 }
0623543b
JK		 5205
5206 /*
5207 * When we journal data on quota file, we have to flush journal to see
5208 * all updates to the file when we bypass pagecache...
5209 */
0390131b 5210 if (EXT4_SB(sb)->s_journal &&
f00c9e44 5211 ext4_should_journal_data(path->dentry->d_inode)) {
0623543b
JK		 5212 /*
5213 * We don't need to lock updates but journal_flush() could
5214 * otherwise be livelocked...
5215 */
5216 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
7ffe1ea8 5217 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
0623543b 5218 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
f00c9e44 5219 if (err)
7ffe1ea8 5220 return err;
0623543b
JK		 5221 }
5222
f00c9e44 5223 return dquot_quota_on(sb, type, format_id, path);
ac27a0ec
DK		 5224}
5225
7c319d32
AK		 5226static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
5227 unsigned int flags)
5228{
5229 int err;
5230 struct inode *qf_inode;
a2d4a646 5231 unsigned long qf_inums[EXT4_MAXQUOTAS] = {
7c319d32
AK		 5232 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
5233 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum)
5234 };
5235
5236 BUG_ON(!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA));
5237
5238 if (!qf_inums[type])
5239 return -EPERM;
5240
5241 qf_inode = ext4_iget(sb, qf_inums[type]);
5242 if (IS_ERR(qf_inode)) {
5243 ext4_error(sb, "Bad quota inode # %lu", qf_inums[type]);
5244 return PTR_ERR(qf_inode);
5245 }
5246
bcb13850
JK		 5247 /* Don't account quota for quota files to avoid recursion */
5248 qf_inode->i_flags |= S_NOQUOTA;
7c319d32
AK		 5249 err = dquot_enable(qf_inode, type, format_id, flags);
5250 iput(qf_inode);
5251
5252 return err;
5253}
5254
5255/* Enable usage tracking for all quota types. */
5256static int ext4_enable_quotas(struct super_block *sb)
5257{
5258 int type, err = 0;
a2d4a646 5259 unsigned long qf_inums[EXT4_MAXQUOTAS] = {
7c319d32
AK		 5260 le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
5261 le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum)
5262 };
5263
5264 sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE;
a2d4a646 5265 for (type = 0; type < EXT4_MAXQUOTAS; type++) {
7c319d32
AK		 5266 if (qf_inums[type]) {
5267 err = ext4_quota_enable(sb, type, QFMT_VFS_V1,
5268 DQUOT_USAGE_ENABLED);
5269 if (err) {
5270 ext4_warning(sb,
72ba7450
TT		 5271 "Failed to enable quota tracking "
5272 "(type=%d, err=%d). Please run "
5273 "e2fsck to fix.", type, err);
7c319d32
AK		 5274 return err;
5275 }
5276 }
5277 }
5278 return 0;
5279}
5280
5281/*
5282 * quota_on function that is used when QUOTA feature is set.
5283 */
5284static int ext4_quota_on_sysfile(struct super_block *sb, int type,
5285 int format_id)
5286{
5287 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA))
5288 return -EINVAL;
5289
5290 /*
5291 * USAGE was enabled at mount time. Only need to enable LIMITS now.
5292 */
5293 return ext4_quota_enable(sb, type, format_id, DQUOT_LIMITS_ENABLED);
5294}
5295
ca0e05e4
DM		 5296static int ext4_quota_off(struct super_block *sb, int type)
5297{
21f97697
JK		 5298 struct inode *inode = sb_dqopt(sb)->files[type];
5299 handle_t *handle;
5300
87009d86
DM		 5301 /* Force all delayed allocation blocks to be allocated.
5302 * Caller already holds s_umount sem */
5303 if (test_opt(sb, DELALLOC))
ca0e05e4 5304 sync_filesystem(sb);
ca0e05e4 5305
0b268590
AG		 5306 if (!inode)
5307 goto out;
5308
21f97697
JK		 5309 /* Update modification times of quota files when userspace can
5310 * start looking at them */
9924a92a 5311 handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1);
21f97697
JK		 5312 if (IS_ERR(handle))
5313 goto out;
5314 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
5315 ext4_mark_inode_dirty(handle, inode);
5316 ext4_journal_stop(handle);
5317
5318out:
ca0e05e4
DM		 5319 return dquot_quota_off(sb, type);
5320}
5321
7c319d32
AK		 5322/*
5323 * quota_off function that is used when QUOTA feature is set.
5324 */
5325static int ext4_quota_off_sysfile(struct super_block *sb, int type)
5326{
5327 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA))
5328 return -EINVAL;
5329
5330 /* Disable only the limits. */
5331 return dquot_disable(sb, type, DQUOT_LIMITS_ENABLED);
5332}
5333
ac27a0ec
DK		 5334/* Read data from quotafile - avoid pagecache and such because we cannot afford
5335 * acquiring the locks... As quota files are never truncated and quota code
25985edc 5336 * itself serializes the operations (and no one else should touch the files)
ac27a0ec 5337 * we don't have to be afraid of races */
617ba13b 5338static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
ac27a0ec
DK		 5339 size_t len, loff_t off)
5340{
5341 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 5342 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
ac27a0ec
DK		 5343 int offset = off & (sb->s_blocksize - 1);
5344 int tocopy;
5345 size_t toread;
5346 struct buffer_head *bh;
5347 loff_t i_size = i_size_read(inode);
5348
5349 if (off > i_size)
5350 return 0;
5351 if (off+len > i_size)
5352 len = i_size-off;
5353 toread = len;
5354 while (toread > 0) {
5355 tocopy = sb->s_blocksize - offset < toread ?
5356 sb->s_blocksize - offset : toread;
1c215028
TT		 5357 bh = ext4_bread(NULL, inode, blk, 0);
5358 if (IS_ERR(bh))
5359 return PTR_ERR(bh);
ac27a0ec
DK		 5360 if (!bh) /* A hole? */
5361 memset(data, 0, tocopy);
5362 else
5363 memcpy(data, bh->b_data+offset, tocopy);
5364 brelse(bh);
5365 offset = 0;
5366 toread -= tocopy;
5367 data += tocopy;
5368 blk++;
5369 }
5370 return len;
5371}
5372
5373/* Write to quotafile (we know the transaction is already started and has
5374 * enough credits) */
617ba13b 5375static ssize_t ext4_quota_write(struct super_block *sb, int type,
ac27a0ec
DK		 5376 const char *data, size_t len, loff_t off)
5377{
5378 struct inode *inode = sb_dqopt(sb)->files[type];
725d26d3 5379 ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
1c215028 5380 int err, offset = off & (sb->s_blocksize - 1);
ac27a0ec
DK		 5381 struct buffer_head *bh;
5382 handle_t *handle = journal_current_handle();
5383
0390131b 5384 if (EXT4_SB(sb)->s_journal && !handle) {
b31e1552
ES		 5385 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
5386 " cancelled because transaction is not started",
9c3013e9
JK		 5387 (unsigned long long)off, (unsigned long long)len);
5388 return -EIO;
5389 }
67eeb568
DM		 5390 /*
5391 * Since we account only one data block in transaction credits,
5392 * then it is impossible to cross a block boundary.
5393 */
5394 if (sb->s_blocksize - offset < len) {
5395 ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
5396 " cancelled because not block aligned",
5397 (unsigned long long)off, (unsigned long long)len);
5398 return -EIO;
5399 }
5400
1c215028
TT		 5401 bh = ext4_bread(handle, inode, blk, 1);
5402 if (IS_ERR(bh))
5403 return PTR_ERR(bh);
67eeb568
DM		 5404 if (!bh)
5405 goto out;
5d601255 5406 BUFFER_TRACE(bh, "get write access");
62d2b5f2
JK		 5407 err = ext4_journal_get_write_access(handle, bh);
5408 if (err) {
5409 brelse(bh);
1c215028 5410 return err;
ac27a0ec 5411 }
67eeb568
DM		 5412 lock_buffer(bh);
5413 memcpy(bh->b_data+offset, data, len);
5414 flush_dcache_page(bh->b_page);
5415 unlock_buffer(bh);
62d2b5f2 5416 err = ext4_handle_dirty_metadata(handle, NULL, bh);
67eeb568 5417 brelse(bh);
ac27a0ec 5418out:
67eeb568
DM		 5419 if (inode->i_size < off + len) {
5420 i_size_write(inode, off + len);
617ba13b 5421 EXT4_I(inode)->i_disksize = inode->i_size;
21f97697 5422 ext4_mark_inode_dirty(handle, inode);
ac27a0ec 5423 }
67eeb568 5424 return len;
ac27a0ec
DK		 5425}
5426
5427#endif
5428
152a0836
AV		 5429static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
5430 const char *dev_name, void *data)
ac27a0ec 5431{
152a0836 5432 return mount_bdev(fs_type, flags, dev_name, data, ext4_fill_super);
ac27a0ec
DK		 5433}
5434
37f328eb 5435#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
24b58424
TT		 5436static inline void register_as_ext2(void)
5437{
5438 int err = register_filesystem(&ext2_fs_type);
5439 if (err)
5440 printk(KERN_WARNING
5441 "EXT4-fs: Unable to register as ext2 (%d)\n", err);
5442}
5443
5444static inline void unregister_as_ext2(void)
5445{
5446 unregister_filesystem(&ext2_fs_type);
5447}
2035e776
TT		 5448
5449static inline int ext2_feature_set_ok(struct super_block *sb)
5450{
5451 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP))
5452 return 0;
5453 if (sb->s_flags & MS_RDONLY)
5454 return 1;
5455 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))
5456 return 0;
5457 return 1;
5458}
24b58424
TT		 5459#else
5460static inline void register_as_ext2(void) { }
5461static inline void unregister_as_ext2(void) { }
2035e776 5462static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; }
24b58424
TT		 5463#endif
5464
37f328eb 5465#if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23)
24b58424
TT		 5466static inline void register_as_ext3(void)
5467{
5468 int err = register_filesystem(&ext3_fs_type);
5469 if (err)
5470 printk(KERN_WARNING
5471 "EXT4-fs: Unable to register as ext3 (%d)\n", err);
5472}
5473
5474static inline void unregister_as_ext3(void)
5475{
5476 unregister_filesystem(&ext3_fs_type);
5477}
2035e776
TT		 5478
5479static inline int ext3_feature_set_ok(struct super_block *sb)
5480{
5481 if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP))
5482 return 0;
5483 if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL))
5484 return 0;
5485 if (sb->s_flags & MS_RDONLY)
5486 return 1;
5487 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP))
5488 return 0;
5489 return 1;
5490}
24b58424
TT		 5491#else
5492static inline void register_as_ext3(void) { }
5493static inline void unregister_as_ext3(void) { }
2035e776 5494static inline int ext3_feature_set_ok(struct super_block *sb) { return 0; }
24b58424
TT		 5495#endif
5496
03010a33
TT		 5497static struct file_system_type ext4_fs_type = {
5498 .owner = THIS_MODULE,
5499 .name = "ext4",
152a0836 5500 .mount = ext4_mount,
03010a33
TT		 5501 .kill_sb = kill_block_super,
5502 .fs_flags = FS_REQUIRES_DEV,
5503};
7f78e035 5504MODULE_ALIAS_FS("ext4");
03010a33 5505
8f021222 5506static int __init ext4_init_feat_adverts(void)
857ac889
LC		 5507{
5508 struct ext4_features *ef;
5509 int ret = -ENOMEM;
5510
5511 ef = kzalloc(sizeof(struct ext4_features), GFP_KERNEL);
5512 if (!ef)
5513 goto out;
5514
5515 ef->f_kobj.kset = ext4_kset;
5516 init_completion(&ef->f_kobj_unregister);
5517 ret = kobject_init_and_add(&ef->f_kobj, &ext4_feat_ktype, NULL,
5518 "features");
5519 if (ret) {
5520 kfree(ef);
5521 goto out;
5522 }
5523
5524 ext4_feat = ef;
5525 ret = 0;
5526out:
5527 return ret;
5528}
5529
8f021222
LC		 5530static void ext4_exit_feat_adverts(void)
5531{
5532 kobject_put(&ext4_feat->f_kobj);
5533 wait_for_completion(&ext4_feat->f_kobj_unregister);
5534 kfree(ext4_feat);
5535}
5536
e9e3bcec
ES		 5537/* Shared across all ext4 file systems */
5538wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
5539struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ];
5540
5dabfc78 5541static int __init ext4_init_fs(void)
ac27a0ec 5542{
e9e3bcec 5543 int i, err;
c9de560d 5544
07c0c5d8
AV		 5545 ext4_li_info = NULL;
5546 mutex_init(&ext4_li_mtx);
5547
9a4c8019 5548 /* Build-time check for flags consistency */
12e9b892 5549 ext4_check_flag_values();
e9e3bcec
ES		 5550
5551 for (i = 0; i < EXT4_WQ_HASH_SZ; i++) {
5552 mutex_init(&ext4__aio_mutex[i]);
5553 init_waitqueue_head(&ext4__ioend_wq[i]);
5554 }
5555
51865fda 5556 err = ext4_init_es();
6fd058f7
TT		 5557 if (err)
5558 return err;
51865fda
ZL		 5559
5560 err = ext4_init_pageio();
5561 if (err)
5562 goto out7;
5563
5dabfc78 5564 err = ext4_init_system_zone();
bd2d0210 5565 if (err)
d44651d0 5566 goto out6;
3197ebdb 5567 ext4_kset = kset_create_and_add("ext4", NULL, fs_kobj);
0e376b1e
TT		 5568 if (!ext4_kset) {
5569 err = -ENOMEM;
dd68314c 5570 goto out5;
0e376b1e 5571 }
d44651d0 5572 ext4_proc_root = proc_mkdir("fs/ext4", NULL);
857ac889
LC		 5573
5574 err = ext4_init_feat_adverts();
dd68314c
TT		 5575 if (err)
5576 goto out4;
857ac889 5577
5dabfc78 5578 err = ext4_init_mballoc();
c9de560d
AT		 5579 if (err)
5580 goto out2;
9c191f70
M		 5581 else
5582 ext4_mballoc_ready = 1;
ac27a0ec
DK		 5583 err = init_inodecache();
5584 if (err)
5585 goto out1;
24b58424 5586 register_as_ext3();
2035e776 5587 register_as_ext2();
03010a33 5588 err = register_filesystem(&ext4_fs_type);
ac27a0ec
DK		 5589 if (err)
5590 goto out;
bfff6873 5591
ac27a0ec
DK		 5592 return 0;
5593out:
24b58424
TT		 5594 unregister_as_ext2();
5595 unregister_as_ext3();
ac27a0ec
DK		 5596 destroy_inodecache();
5597out1:
9c191f70 5598 ext4_mballoc_ready = 0;
5dabfc78 5599 ext4_exit_mballoc();
9c191f70 5600out2:
8f021222 5601 ext4_exit_feat_adverts();
dd68314c 5602out4:
d44651d0
FJ		 5603 if (ext4_proc_root)
5604 remove_proc_entry("fs/ext4", NULL);
6fd058f7 5605 kset_unregister(ext4_kset);
d44651d0 5606out5:
5dabfc78 5607 ext4_exit_system_zone();
d44651d0 5608out6:
5dabfc78 5609 ext4_exit_pageio();
51865fda
ZL		 5610out7:
5611 ext4_exit_es();
5612
ac27a0ec
DK		 5613 return err;
5614}
5615
5dabfc78 5616static void __exit ext4_exit_fs(void)
ac27a0ec 5617{
bfff6873 5618 ext4_destroy_lazyinit_thread();
24b58424
TT		 5619 unregister_as_ext2();
5620 unregister_as_ext3();
03010a33 5621 unregister_filesystem(&ext4_fs_type);
ac27a0ec 5622 destroy_inodecache();
5dabfc78 5623 ext4_exit_mballoc();
8f021222 5624 ext4_exit_feat_adverts();
9f6200bb 5625 remove_proc_entry("fs/ext4", NULL);
3197ebdb 5626 kset_unregister(ext4_kset);
5dabfc78
TT		 5627 ext4_exit_system_zone();
5628 ext4_exit_pageio();
dd12ed14 5629 ext4_exit_es();
ac27a0ec
DK		 5630}
5631
5632MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
83982b6f 5633MODULE_DESCRIPTION("Fourth Extended Filesystem");
ac27a0ec 5634MODULE_LICENSE("GPL");
5dabfc78
TT		 5635module_init(ext4_init_fs)
5636module_exit(ext4_exit_fs)