super.c 154 KB
Newer Older
1
/*
2
 *  linux/fs/ext4/super.c
3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22
 *
 * Copyright (C) 1992, 1993, 1994, 1995
 * Remy Card (card@masi.ibp.fr)
 * Laboratoire MASI - Institut Blaise Pascal
 * Universite Pierre et Marie Curie (Paris VI)
 *
 *  from
 *
 *  linux/fs/minix/inode.c
 *
 *  Copyright (C) 1991, 1992  Linus Torvalds
 *
 *  Big-endian to little-endian byte-swapping/bitmaps by
 *        David S. Miller (davem@caip.rutgers.edu), 1995
 */

#include <linux/module.h>
#include <linux/string.h>
#include <linux/fs.h>
#include <linux/time.h>
23
#include <linux/vmalloc.h>
24 25 26
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/blkdev.h>
27
#include <linux/backing-dev.h>
28 29
#include <linux/parser.h>
#include <linux/buffer_head.h>
30
#include <linux/exportfs.h>
31 32 33 34 35 36
#include <linux/vfs.h>
#include <linux/random.h>
#include <linux/mount.h>
#include <linux/namei.h>
#include <linux/quotaops.h>
#include <linux/seq_file.h>
Theodore Ts'o's avatar
Theodore Ts'o committed
37
#include <linux/ctype.h>
Vignesh Babu's avatar
Vignesh Babu committed
38
#include <linux/log2.h>
39
#include <linux/crc16.h>
40
#include <linux/cleancache.h>
41 42
#include <asm/uaccess.h>

43 44 45
#include <linux/kthread.h>
#include <linux/freezer.h>

46
#include "ext4.h"
47
#include "ext4_extents.h"	/* Needed for trace points definition */
48
#include "ext4_jbd2.h"
49 50
#include "xattr.h"
#include "acl.h"
51
#include "mballoc.h"
52

53 54 55
#define CREATE_TRACE_POINTS
#include <trace/events/ext4.h>

56 57
static struct ext4_lazy_init *ext4_li_info;
static struct mutex ext4_li_mtx;
58
static int ext4_mballoc_ready;
59
static struct ratelimit_state ext4_mount_msg_ratelimit;
60

61
static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
62
			     unsigned long journal_devnum);
63
static int ext4_show_options(struct seq_file *seq, struct dentry *root);
64
static int ext4_commit_super(struct super_block *sb, int sync);
65 66 67 68
static void ext4_mark_recovery_complete(struct super_block *sb,
					struct ext4_super_block *es);
static void ext4_clear_journal_err(struct super_block *sb,
				   struct ext4_super_block *es);
69
static int ext4_sync_fs(struct super_block *sb, int wait);
70 71
static int ext4_remount(struct super_block *sb, int *flags, char *data);
static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf);
72 73
static int ext4_unfreeze(struct super_block *sb);
static int ext4_freeze(struct super_block *sb);
Al Viro's avatar
Al Viro committed
74 75
static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
		       const char *dev_name, void *data);
76 77
static inline int ext2_feature_set_ok(struct super_block *sb);
static inline int ext3_feature_set_ok(struct super_block *sb);
78
static int ext4_feature_set_ok(struct super_block *sb, int readonly);
79 80
static void ext4_destroy_lazyinit_thread(void);
static void ext4_unregister_li_request(struct super_block *sb);
81
static void ext4_clear_request_list(void);
82

83
#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2)
84 85 86 87 88 89 90
static struct file_system_type ext2_fs_type = {
	.owner		= THIS_MODULE,
	.name		= "ext2",
	.mount		= ext4_mount,
	.kill_sb	= kill_block_super,
	.fs_flags	= FS_REQUIRES_DEV,
};
91
MODULE_ALIAS_FS("ext2");
92
MODULE_ALIAS("ext2");
93 94 95 96 97 98
#define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type)
#else
#define IS_EXT2_SB(sb) (0)
#endif


99 100 101
static struct file_system_type ext3_fs_type = {
	.owner		= THIS_MODULE,
	.name		= "ext3",
Al Viro's avatar
Al Viro committed
102
	.mount		= ext4_mount,
103 104 105
	.kill_sb	= kill_block_super,
	.fs_flags	= FS_REQUIRES_DEV,
};
106
MODULE_ALIAS_FS("ext3");
107
MODULE_ALIAS("ext3");
108
#define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type)
109

110 111 112
static int ext4_verify_csum_type(struct super_block *sb,
				 struct ext4_super_block *es)
{
113
	if (!ext4_has_feature_metadata_csum(sb))
114 115 116 117 118
		return 1;

	return es->s_checksum_type == EXT4_CRC32C_CHKSUM;
}

119 120 121 122 123 124 125 126 127 128 129 130
static __le32 ext4_superblock_csum(struct super_block *sb,
				   struct ext4_super_block *es)
{
	struct ext4_sb_info *sbi = EXT4_SB(sb);
	int offset = offsetof(struct ext4_super_block, s_checksum);
	__u32 csum;

	csum = ext4_chksum(sbi, ~0, (char *)es, offset);

	return cpu_to_le32(csum);
}

131 132
static int ext4_superblock_csum_verify(struct super_block *sb,
				       struct ext4_super_block *es)
133
{
134
	if (!ext4_has_metadata_csum(sb))
135 136 137 138 139
		return 1;

	return es->s_checksum == ext4_superblock_csum(sb, es);
}

140
void ext4_superblock_csum_set(struct super_block *sb)
141
{
142 143
	struct ext4_super_block *es = EXT4_SB(sb)->s_es;

144
	if (!ext4_has_metadata_csum(sb))
145 146 147 148 149
		return;

	es->s_checksum = ext4_superblock_csum(sb, es);
}

150 151 152 153
void *ext4_kvmalloc(size_t size, gfp_t flags)
{
	void *ret;

154
	ret = kmalloc(size, flags | __GFP_NOWARN);
155 156 157 158 159 160 161 162 163
	if (!ret)
		ret = __vmalloc(size, flags, PAGE_KERNEL);
	return ret;
}

void *ext4_kvzalloc(size_t size, gfp_t flags)
{
	void *ret;

164
	ret = kzalloc(size, flags | __GFP_NOWARN);
165 166 167 168 169
	if (!ret)
		ret = __vmalloc(size, flags | __GFP_ZERO, PAGE_KERNEL);
	return ret;
}

170 171
ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
			       struct ext4_group_desc *bg)
172
{
173
	return le32_to_cpu(bg->bg_block_bitmap_lo) |
174
		(EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
175
		 (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0);
176 177
}

178 179
ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
			       struct ext4_group_desc *bg)
180
{
181
	return le32_to_cpu(bg->bg_inode_bitmap_lo) |
182
		(EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
183
		 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
184 185
}

186 187
ext4_fsblk_t ext4_inode_table(struct super_block *sb,
			      struct ext4_group_desc *bg)
188
{
189
	return le32_to_cpu(bg->bg_inode_table_lo) |
190
		(EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
191
		 (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
192 193
}

194 195
__u32 ext4_free_group_clusters(struct super_block *sb,
			       struct ext4_group_desc *bg)
196 197 198
{
	return le16_to_cpu(bg->bg_free_blocks_count_lo) |
		(EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
199
		 (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0);
200 201 202 203 204 205 206
}

__u32 ext4_free_inodes_count(struct super_block *sb,
			      struct ext4_group_desc *bg)
{
	return le16_to_cpu(bg->bg_free_inodes_count_lo) |
		(EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
207
		 (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0);
208 209 210 211 212 213 214
}

__u32 ext4_used_dirs_count(struct super_block *sb,
			      struct ext4_group_desc *bg)
{
	return le16_to_cpu(bg->bg_used_dirs_count_lo) |
		(EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
215
		 (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0);
216 217 218 219 220 221 222
}

__u32 ext4_itable_unused_count(struct super_block *sb,
			      struct ext4_group_desc *bg)
{
	return le16_to_cpu(bg->bg_itable_unused_lo) |
		(EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
223
		 (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0);
224 225
}

226 227
void ext4_block_bitmap_set(struct super_block *sb,
			   struct ext4_group_desc *bg, ext4_fsblk_t blk)
228
{
229
	bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk);
230 231
	if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
		bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32);
232 233
}

234 235
void ext4_inode_bitmap_set(struct super_block *sb,
			   struct ext4_group_desc *bg, ext4_fsblk_t blk)
236
{
237
	bg->bg_inode_bitmap_lo  = cpu_to_le32((u32)blk);
238 239
	if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
		bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
240 241
}

242 243
void ext4_inode_table_set(struct super_block *sb,
			  struct ext4_group_desc *bg, ext4_fsblk_t blk)
244
{
245
	bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
246 247
	if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
		bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
248 249
}

250 251
void ext4_free_group_clusters_set(struct super_block *sb,
				  struct ext4_group_desc *bg, __u32 count)
252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281
{
	bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count);
	if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
		bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16);
}

void ext4_free_inodes_set(struct super_block *sb,
			  struct ext4_group_desc *bg, __u32 count)
{
	bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count);
	if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
		bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16);
}

void ext4_used_dirs_set(struct super_block *sb,
			  struct ext4_group_desc *bg, __u32 count)
{
	bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count);
	if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
		bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16);
}

void ext4_itable_unused_set(struct super_block *sb,
			  struct ext4_group_desc *bg, __u32 count)
{
	bg->bg_itable_unused_lo = cpu_to_le16((__u16)count);
	if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
		bg->bg_itable_unused_hi = cpu_to_le16(count >> 16);
}

282

283 284 285 286 287 288
static void __save_error_info(struct super_block *sb, const char *func,
			    unsigned int line)
{
	struct ext4_super_block *es = EXT4_SB(sb)->s_es;

	EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
289 290
	if (bdev_read_only(sb->s_bdev))
		return;
291 292 293 294 295 296 297 298 299 300 301 302
	es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
	es->s_last_error_time = cpu_to_le32(get_seconds());
	strncpy(es->s_last_error_func, func, sizeof(es->s_last_error_func));
	es->s_last_error_line = cpu_to_le32(line);
	if (!es->s_first_error_time) {
		es->s_first_error_time = es->s_last_error_time;
		strncpy(es->s_first_error_func, func,
			sizeof(es->s_first_error_func));
		es->s_first_error_line = cpu_to_le32(line);
		es->s_first_error_ino = es->s_last_error_ino;
		es->s_first_error_block = es->s_last_error_block;
	}
303 304 305 306 307 308
	/*
	 * Start the daily error reporting function if it hasn't been
	 * started already
	 */
	if (!es->s_error_count)
		mod_timer(&EXT4_SB(sb)->s_err_report, jiffies + 24*60*60*HZ);
309
	le32_add_cpu(&es->s_error_count, 1);
310 311 312 313 314 315 316 317 318
}

static void save_error_info(struct super_block *sb, const char *func,
			    unsigned int line)
{
	__save_error_info(sb, func, line);
	ext4_commit_super(sb, 1);
}

319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334
/*
 * The del_gendisk() function uninitializes the disk-specific data
 * structures, including the bdi structure, without telling anyone
 * else.  Once this happens, any attempt to call mark_buffer_dirty()
 * (for example, by ext4_commit_super), will cause a kernel OOPS.
 * This is a kludge to prevent these oops until we can put in a proper
 * hook in del_gendisk() to inform the VFS and file system layers.
 */
static int block_device_ejected(struct super_block *sb)
{
	struct inode *bd_inode = sb->s_bdev->bd_inode;
	struct backing_dev_info *bdi = inode_to_bdi(bd_inode);

	return bdi->dev == NULL;
}

Bobi Jam's avatar
Bobi Jam committed
335 336 337 338 339
static void ext4_journal_commit_callback(journal_t *journal, transaction_t *txn)
{
	struct super_block		*sb = journal->j_private;
	struct ext4_sb_info		*sbi = EXT4_SB(sb);
	int				error = is_journal_aborted(journal);
340
	struct ext4_journal_cb_entry	*jce;
Bobi Jam's avatar
Bobi Jam committed
341

342
	BUG_ON(txn->t_state == T_FINISHED);
Bobi Jam's avatar
Bobi Jam committed
343
	spin_lock(&sbi->s_md_lock);
344 345 346
	while (!list_empty(&txn->t_private_list)) {
		jce = list_entry(txn->t_private_list.next,
				 struct ext4_journal_cb_entry, jce_list);
Bobi Jam's avatar
Bobi Jam committed
347 348 349 350 351 352 353
		list_del_init(&jce->jce_list);
		spin_unlock(&sbi->s_md_lock);
		jce->jce_func(sb, jce, error);
		spin_lock(&sbi->s_md_lock);
	}
	spin_unlock(&sbi->s_md_lock);
}
354

355 356 357 358
/* Deal with the reporting of failure conditions on a filesystem such as
 * inconsistencies detected or read IO failures.
 *
 * On ext2, we can store the error state of the filesystem in the
359
 * superblock.  That is not possible on ext4, because we may have other
360 361 362 363 364
 * write ordering constraints on the superblock which prevent us from
 * writing it out straight away; and given that the journal is about to
 * be aborted, we can't rely on the current, or future, transactions to
 * write out the superblock safely.
 *
365
 * We'll just use the jbd2_journal_abort() error code to record an error in
366
 * the journal instead.  On recovery, the journal will complain about
367 368 369
 * that error until we've noted it down and cleared it.
 */

370
static void ext4_handle_error(struct super_block *sb)
371 372 373 374
{
	if (sb->s_flags & MS_RDONLY)
		return;

375
	if (!test_opt(sb, ERRORS_CONT)) {
376
		journal_t *journal = EXT4_SB(sb)->s_journal;
377

378
		EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
379
		if (journal)
380
			jbd2_journal_abort(journal, -EIO);
381
	}
382
	if (test_opt(sb, ERRORS_RO)) {
383
		ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
384 385 386 387 388
		/*
		 * Make sure updated value of ->s_mount_flags will be visible
		 * before ->s_flags update
		 */
		smp_wmb();
389 390
		sb->s_flags |= MS_RDONLY;
	}
391 392 393 394
	if (test_opt(sb, ERRORS_PANIC)) {
		if (EXT4_SB(sb)->s_journal &&
		  !(EXT4_SB(sb)->s_journal->j_flags & JBD2_REC_ERR))
			return;
395
		panic("EXT4-fs (device %s): panic forced after error\n",
396
			sb->s_id);
397
	}
398 399
}

400 401 402 403
#define ext4_error_ratelimit(sb)					\
		___ratelimit(&(EXT4_SB(sb)->s_err_ratelimit_state),	\
			     "EXT4-fs error")

404
void __ext4_error(struct super_block *sb, const char *function,
405
		  unsigned int line, const char *fmt, ...)
406
{
Joe Perches's avatar
Joe Perches committed
407
	struct va_format vaf;
408 409
	va_list args;

410 411 412 413 414 415 416 417 418
	if (ext4_error_ratelimit(sb)) {
		va_start(args, fmt);
		vaf.fmt = fmt;
		vaf.va = &args;
		printk(KERN_CRIT
		       "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n",
		       sb->s_id, function, line, current->comm, &vaf);
		va_end(args);
	}
419
	save_error_info(sb, function, line);
420
	ext4_handle_error(sb);
421 422
}

423 424 425
void __ext4_error_inode(struct inode *inode, const char *function,
			unsigned int line, ext4_fsblk_t block,
			const char *fmt, ...)
426 427
{
	va_list args;
428
	struct va_format vaf;
429
	struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
430

431 432
	es->s_last_error_ino = cpu_to_le32(inode->i_ino);
	es->s_last_error_block = cpu_to_le64(block);
433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448
	if (ext4_error_ratelimit(inode->i_sb)) {
		va_start(args, fmt);
		vaf.fmt = fmt;
		vaf.va = &args;
		if (block)
			printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
			       "inode #%lu: block %llu: comm %s: %pV\n",
			       inode->i_sb->s_id, function, line, inode->i_ino,
			       block, current->comm, &vaf);
		else
			printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: "
			       "inode #%lu: comm %s: %pV\n",
			       inode->i_sb->s_id, function, line, inode->i_ino,
			       current->comm, &vaf);
		va_end(args);
	}
449
	save_error_info(inode->i_sb, function, line);
450 451 452
	ext4_handle_error(inode->i_sb);
}

453 454 455
void __ext4_error_file(struct file *file, const char *function,
		       unsigned int line, ext4_fsblk_t block,
		       const char *fmt, ...)
456 457
{
	va_list args;
458
	struct va_format vaf;
459
	struct ext4_super_block *es;
Al Viro's avatar
Al Viro committed
460
	struct inode *inode = file_inode(file);
461 462
	char pathname[80], *path;

463 464
	es = EXT4_SB(inode->i_sb)->s_es;
	es->s_last_error_ino = cpu_to_le32(inode->i_ino);
465
	if (ext4_error_ratelimit(inode->i_sb)) {
466
		path = file_path(file, pathname, sizeof(pathname));
467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485
		if (IS_ERR(path))
			path = "(unknown)";
		va_start(args, fmt);
		vaf.fmt = fmt;
		vaf.va = &args;
		if (block)
			printk(KERN_CRIT
			       "EXT4-fs error (device %s): %s:%d: inode #%lu: "
			       "block %llu: comm %s: path %s: %pV\n",
			       inode->i_sb->s_id, function, line, inode->i_ino,
			       block, current->comm, path, &vaf);
		else
			printk(KERN_CRIT
			       "EXT4-fs error (device %s): %s:%d: inode #%lu: "
			       "comm %s: path %s: %pV\n",
			       inode->i_sb->s_id, function, line, inode->i_ino,
			       current->comm, path, &vaf);
		va_end(args);
	}
486
	save_error_info(inode->i_sb, function, line);
487 488 489
	ext4_handle_error(inode->i_sb);
}

490 491
const char *ext4_decode_error(struct super_block *sb, int errno,
			      char nbuf[16])
492 493 494 495
{
	char *errstr = NULL;

	switch (errno) {
496 497 498 499 500 501
	case -EFSCORRUPTED:
		errstr = "Corrupt filesystem";
		break;
	case -EFSBADCRC:
		errstr = "Filesystem failed CRC";
		break;
502 503 504 505 506 507 508
	case -EIO:
		errstr = "IO failure";
		break;
	case -ENOMEM:
		errstr = "Out of memory";
		break;
	case -EROFS:
509 510
		if (!sb || (EXT4_SB(sb)->s_journal &&
			    EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT))
511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529
			errstr = "Journal has aborted";
		else
			errstr = "Readonly filesystem";
		break;
	default:
		/* If the caller passed in an extra buffer for unknown
		 * errors, textualise them now.  Else we just return
		 * NULL. */
		if (nbuf) {
			/* Check for truncated error codes... */
			if (snprintf(nbuf, 16, "error %d", -errno) >= 0)
				errstr = nbuf;
		}
		break;
	}

	return errstr;
}

530
/* __ext4_std_error decodes expected errors from journaling functions
531 532
 * automatically and invokes the appropriate error response.  */

533 534
void __ext4_std_error(struct super_block *sb, const char *function,
		      unsigned int line, int errno)
535 536 537 538 539 540 541 542 543 544 545
{
	char nbuf[16];
	const char *errstr;

	/* Special case: if the error is EROFS, and we're not already
	 * inside a transaction, then there's really no point in logging
	 * an error. */
	if (errno == -EROFS && journal_current_handle() == NULL &&
	    (sb->s_flags & MS_RDONLY))
		return;

546 547 548 549 550
	if (ext4_error_ratelimit(sb)) {
		errstr = ext4_decode_error(sb, errno, nbuf);
		printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n",
		       sb->s_id, function, line, errstr);
	}
551

552
	save_error_info(sb, function, line);
553
	ext4_handle_error(sb);
554 555 556
}

/*
557
 * ext4_abort is a much stronger failure handler than ext4_error.  The
558 559 560 561 562 563 564 565
 * abort function may be used to deal with unrecoverable failures such
 * as journal IO errors or ENOMEM at a critical moment in log management.
 *
 * We unconditionally force the filesystem into an ABORT|READONLY state,
 * unless the error response on the fs has been set to panic in which
 * case we take the easy way out and panic immediately.
 */

566
void __ext4_abort(struct super_block *sb, const char *function,
567
		unsigned int line, const char *fmt, ...)
568 569 570
{
	va_list args;

571
	save_error_info(sb, function, line);
572
	va_start(args, fmt);
573 574
	printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: ", sb->s_id,
	       function, line);
575 576 577 578
	vprintk(fmt, args);
	printk("\n");
	va_end(args);

579 580 581
	if ((sb->s_flags & MS_RDONLY) == 0) {
		ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only");
		EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED;
582 583 584 585 586 587
		/*
		 * Make sure updated value of ->s_mount_flags will be visible
		 * before ->s_flags update
		 */
		smp_wmb();
		sb->s_flags |= MS_RDONLY;
588 589 590 591
		if (EXT4_SB(sb)->s_journal)
			jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO);
		save_error_info(sb, function, line);
	}
592 593 594 595
	if (test_opt(sb, ERRORS_PANIC)) {
		if (EXT4_SB(sb)->s_journal &&
		  !(EXT4_SB(sb)->s_journal->j_flags & JBD2_REC_ERR))
			return;
596
		panic("EXT4-fs panic from previous error\n");
597
	}
598 599
}

600 601
void __ext4_msg(struct super_block *sb,
		const char *prefix, const char *fmt, ...)
602
{
Joe Perches's avatar
Joe Perches committed
603
	struct va_format vaf;
604 605
	va_list args;

606 607 608
	if (!___ratelimit(&(EXT4_SB(sb)->s_msg_ratelimit_state), "EXT4-fs"))
		return;

609
	va_start(args, fmt);
Joe Perches's avatar
Joe Perches committed
610 611 612
	vaf.fmt = fmt;
	vaf.va = &args;
	printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf);
613 614 615
	va_end(args);
}

616 617 618 619
#define ext4_warning_ratelimit(sb)					\
		___ratelimit(&(EXT4_SB(sb)->s_warning_ratelimit_state),	\
			     "EXT4-fs warning")

620
void __ext4_warning(struct super_block *sb, const char *function,
621
		    unsigned int line, const char *fmt, ...)
622
{
Joe Perches's avatar
Joe Perches committed
623
	struct va_format vaf;
624 625
	va_list args;

626
	if (!ext4_warning_ratelimit(sb))
627 628
		return;

629
	va_start(args, fmt);
Joe Perches's avatar
Joe Perches committed
630 631 632 633
	vaf.fmt = fmt;
	vaf.va = &args;
	printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: %pV\n",
	       sb->s_id, function, line, &vaf);
634 635 636
	va_end(args);
}

637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654
void __ext4_warning_inode(const struct inode *inode, const char *function,
			  unsigned int line, const char *fmt, ...)
{
	struct va_format vaf;
	va_list args;

	if (!ext4_warning_ratelimit(inode->i_sb))
		return;

	va_start(args, fmt);
	vaf.fmt = fmt;
	vaf.va = &args;
	printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: "
	       "inode #%lu: comm %s: %pV\n", inode->i_sb->s_id,
	       function, line, inode->i_ino, current->comm, &vaf);
	va_end(args);
}

655 656 657 658
void __ext4_grp_locked_error(const char *function, unsigned int line,
			     struct super_block *sb, ext4_group_t grp,
			     unsigned long ino, ext4_fsblk_t block,
			     const char *fmt, ...)
659 660 661
__releases(bitlock)
__acquires(bitlock)
{
Joe Perches's avatar
Joe Perches committed
662
	struct va_format vaf;
663 664 665
	va_list args;
	struct ext4_super_block *es = EXT4_SB(sb)->s_es;

666 667 668
	es->s_last_error_ino = cpu_to_le32(ino);
	es->s_last_error_block = cpu_to_le64(block);
	__save_error_info(sb, function, line);
Joe Perches's avatar
Joe Perches committed
669

670 671 672 673 674 675 676 677 678 679 680 681 682 683
	if (ext4_error_ratelimit(sb)) {
		va_start(args, fmt);
		vaf.fmt = fmt;
		vaf.va = &args;
		printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u, ",
		       sb->s_id, function, line, grp);
		if (ino)
			printk(KERN_CONT "inode %lu: ", ino);
		if (block)
			printk(KERN_CONT "block %llu:",
			       (unsigned long long) block);
		printk(KERN_CONT "%pV\n", &vaf);
		va_end(args);
	}
684 685

	if (test_opt(sb, ERRORS_CONT)) {
686
		ext4_commit_super(sb, 0);
687 688
		return;
	}
689

690 691 692 693 694 695 696 697
	ext4_unlock_group(sb, grp);
	ext4_handle_error(sb);
	/*
	 * We only get here in the ERRORS_RO case; relocking the group
	 * may be dangerous, but nothing bad will happen since the
	 * filesystem will have already been marked read/only and the
	 * journal has been aborted.  We return 1 as a hint to callers
	 * who might what to use the return value from
Lucas De Marchi's avatar
Lucas De Marchi committed
698
	 * ext4_grp_locked_error() to distinguish between the
699 700 701 702 703 704 705 706
	 * ERRORS_CONT and ERRORS_RO case, and perhaps return more
	 * aggressively from the ext4 function in question, with a
	 * more appropriate error code.
	 */
	ext4_lock_group(sb, grp);
	return;
}

707
void ext4_update_dynamic_rev(struct super_block *sb)
708
{
709
	struct ext4_super_block *es = EXT4_SB(sb)->s_es;
710

711
	if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV)
712 713
		return;

714
	ext4_warning(sb,
715 716
		     "updating to rev %d because of new feature flag, "
		     "running e2fsck is recommended",
717
		     EXT4_DYNAMIC_REV);
718

719 720 721
	es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO);
	es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE);
	es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV);
722 723 724 725 726 727 728 729 730 731 732 733 734
	/* leave es->s_feature_*compat flags alone */
	/* es->s_uuid will be set by e2fsck if empty */

	/*
	 * The rest of the superblock fields should be zero, and if not it
	 * means they are likely already in use, so leave them alone.  We
	 * can leave it up to e2fsck to clean up any inconsistencies there.
	 */
}

/*
 * Open the external journal device
 */
735
static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb)
736 737 738 739
{
	struct block_device *bdev;
	char b[BDEVNAME_SIZE];

740
	bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb);
741 742 743 744 745
	if (IS_ERR(bdev))
		goto fail;
	return bdev;

fail:
746
	ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld",
747 748 749 750 751 752 753
			__bdevname(dev, b), PTR_ERR(bdev));
	return NULL;
}

/*
 * Release the journal device
 */
Al Viro's avatar
Al Viro committed
754
static void ext4_blkdev_put(struct block_device *bdev)
755
{
Al Viro's avatar
Al Viro committed
756
	blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
757 758
}

Al Viro's avatar
Al Viro committed
759
static void ext4_blkdev_remove(struct ext4_sb_info *sbi)
760 761 762 763
{
	struct block_device *bdev;
	bdev = sbi->journal_bdev;
	if (bdev) {
Al Viro's avatar
Al Viro committed
764
		ext4_blkdev_put(bdev);
765 766 767 768 769 770
		sbi->journal_bdev = NULL;
	}
}

static inline struct inode *orphan_list_entry(struct list_head *l)
{
771
	return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode;
772 773
}

774
static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi)
775 776 777
{
	struct list_head *l;

778 779
	ext4_msg(sb, KERN_ERR, "sb orphan head is %d",
		 le32_to_cpu(sbi->s_es->s_last_orphan));
780 781 782 783 784 785 786 787 788 789 790 791

	printk(KERN_ERR "sb_info orphan list:\n");
	list_for_each(l, &sbi->s_orphan) {
		struct inode *inode = orphan_list_entry(l);
		printk(KERN_ERR "  "
		       "inode %s:%lu at %p: mode %o, nlink %d, next %d\n",
		       inode->i_sb->s_id, inode->i_ino, inode,
		       inode->i_mode, inode->i_nlink,
		       NEXT_ORPHAN(inode));
	}
}

792
static void ext4_put_super(struct super_block *sb)
793
{
794 795
	struct ext4_sb_info *sbi = EXT4_SB(sb);
	struct ext4_super_block *es = sbi->s_es;
796
	int aborted = 0;
797
	int i, err;
798

799
	ext4_unregister_li_request(sb);
800 801
	dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED);

802 803
	flush_workqueue(sbi->rsv_conversion_wq);
	destroy_workqueue(sbi->rsv_conversion_wq);
804

805
	if (sbi->s_journal) {
806
		aborted = is_journal_aborted(sbi->s_journal);
807 808
		err = jbd2_journal_destroy(sbi->s_journal);
		sbi->s_journal = NULL;
809
		if ((err < 0) && !aborted)
810
			ext4_abort(sb, "Couldn't clean up the journal");
811
	}
812

813
	ext4_unregister_sysfs(sb);
814
	ext4_es_unregister_shrinker(sbi);
815
	del_timer_sync(&sbi->s_err_report);
816 817 818 819 820
	ext4_release_system_zone(sb);
	ext4_mb_release(sb);
	ext4_ext_release(sb);
	ext4_xattr_put_super(sb);

821
	if (!(sb->s_flags & MS_RDONLY) && !aborted) {
822
		ext4_clear_feature_journal_needs_recovery(sb);
823 824
		es->s_state = cpu_to_le16(sbi->s_mount_state);
	}
825
	if (!(sb->s_flags & MS_RDONLY))
826 827
		ext4_commit_super(sb, 1);

828 829
	for (i = 0; i < sbi->s_gdb_count; i++)
		brelse(sbi->s_group_desc[i]);
Al Viro's avatar
Al Viro committed
830 831
	kvfree(sbi->s_group_desc);
	kvfree(sbi->s_flex_groups);
832
	percpu_counter_destroy(&sbi->s_freeclusters_counter);
833 834
	percpu_counter_destroy(&sbi->s_freeinodes_counter);
	percpu_counter_destroy(&sbi->s_dirs_counter);
835
	percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
836 837
	brelse(sbi->s_sbh);
#ifdef CONFIG_QUOTA
Jan Kara's avatar
Jan Kara committed
838
	for (i = 0; i < EXT4_MAXQUOTAS; i++)
839 840 841 842 843 844 845 846 847 848 849
		kfree(sbi->s_qf_names[i]);
#endif

	/* Debugging code just in case the in-memory inode orphan list
	 * isn't empty.  The on-disk one can be non-empty if we've
	 * detected an error and taken the fs readonly, but the
	 * in-memory list had better be clean by this point. */
	if (!list_empty(&sbi->s_orphan))
		dump_orphan_list(sb, sbi);
	J_ASSERT(list_empty(&sbi->s_orphan));

850
	sync_blockdev(sb->s_bdev);
851
	invalidate_bdev(sb->s_bdev);
852 853 854 855 856 857 858
	if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) {
		/*
		 * Invalidate the journal device's buffers.  We don't want them
		 * floating about in memory - the physical journal device may
		 * hotswapped, and it breaks the `ro-after' testing code.
		 */
		sync_blockdev(sbi->journal_bdev);
859
		invalidate_bdev(sbi->journal_bdev);
860
		ext4_blkdev_remove(sbi);
861
	}
862 863 864 865
	if (sbi->s_mb_cache) {
		ext4_xattr_destroy_cache(sbi->s_mb_cache);
		sbi->s_mb_cache = NULL;
	}
866 867
	if (sbi->s_mmp_tsk)
		kthread_stop(sbi->s_mmp_tsk);
868
	sb->s_fs_info = NULL;
Theodore Ts'o's avatar
Theodore Ts'o committed
869 870 871 872 873 874
	/*
	 * Now that we are completely done shutting down the
	 * superblock, we need to actually destroy the kobject.
	 */
	kobject_put(&sbi->s_kobj);
	wait_for_completion(&sbi->s_kobj_unregister);
875 876
	if (sbi->s_chksum_driver)
		crypto_free_shash(sbi->s_chksum_driver);
877
	kfree(sbi->s_blockgroup_lock);
878 879 880
	kfree(sbi);
}

881
static struct kmem_cache *ext4_inode_cachep;
882 883 884 885

/*
 * Called inside transaction, so use GFP_NOFS
 */
886
static struct inode *ext4_alloc_inode(struct super_block *sb)
887
{
888
	struct ext4_inode_info *ei;
889

890
	ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS);
891 892
	if (!ei)
		return NULL;
893

894
	ei->vfs_inode.i_version = 1;
895
	spin_lock_init(&ei->i_raw_lock);
896 897
	INIT_LIST_HEAD(&ei->i_prealloc_list);
	spin_lock_init(&ei->i_prealloc_lock);
898 899
	ext4_es_init_tree(&ei->i_es_tree);
	rwlock_init(&ei->i_es_lock);
900
	INIT_LIST_HEAD(&ei->i_es_list);
901
	ei->i_es_all_nr = 0;
902
	ei->i_es_shk_nr = 0;
903
	ei->i_es_shrink_lblk = 0;
904 905 906
	ei->i_reserved_data_blocks = 0;
	ei->i_reserved_meta_blocks = 0;
	ei->i_allocated_meta_blocks = 0;
907
	ei->i_da_metadata_calc_len = 0;
908
	ei->i_da_metadata_calc_last_lblock = 0;
909
	spin_lock_init(&(ei->i_block_reservation_lock));
910 911
#ifdef CONFIG_QUOTA
	ei->i_reserved_quota = 0;
912
	memset(&ei->i_dquot, 0, sizeof(ei->i_dquot));
913
#endif
914
	ei->jinode = NULL;
915
	INIT_LIST_HEAD(&ei->i_rsv_conversion_list);
916
	spin_lock_init(&ei->i_completed_io_lock);
917 918
	ei->i_sync_tid = 0;
	ei->i_datasync_tid = 0;
919
	atomic_set(&ei->i_ioend_count, 0);
920
	atomic_set(&ei->i_unwritten, 0);
921
	INIT_WORK(&ei->i_rsv_conversion_work, ext4_end_io_rsv_work);
922
#ifdef CONFIG_EXT4_FS_ENCRYPTION
923
	ei->i_crypt_info = NULL;
924
#endif
925 926 927
	return &ei->vfs_inode;
}

928 929 930 931 932 933 934 935
static int ext4_drop_inode(struct inode *inode)
{
	int drop = generic_drop_inode(inode);

	trace_ext4_drop_inode(inode, drop);
	return drop;
}

Nick Piggin's avatar
Nick Piggin committed
936 937 938 939 940 941
static void ext4_i_callback(struct rcu_head *head)
{
	struct inode *inode = container_of(head, struct inode, i_rcu);
	kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
}

942
static void ext4_destroy_inode(struct inode *inode)
943
{
944
	if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
945 946 947
		ext4_msg(inode->i_sb, KERN_ERR,
			 "Inode %lu (%p): orphan list check failed!",
			 inode->i_ino, EXT4_I(inode));
948 949 950 951 952
		print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4,
				EXT4_I(inode), sizeof(struct ext4_inode_info),
				true);
		dump_stack();
	}
Nick Piggin's avatar
Nick Piggin committed
953
	call_rcu(&inode->i_rcu, ext4_i_callback);
954 955
}

956
static void init_once(void *foo)
957
{
958
	struct ext4_inode_info *ei = (struct ext4_inode_info *) foo;
959

960 961
	INIT_LIST_HEAD(&ei->i_orphan);
	init_rwsem(&ei->xattr_sem);
962
	init_rwsem(&ei->i_data_sem);
963
	init_rwsem(&ei->i_mmap_sem);
964
	inode_init_once(&ei->vfs_inode);
965 966
}

967
static int __init init_inodecache(void)
968
{
969 970
	ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
					     sizeof(struct ext4_inode_info),
971 972
					     0, (SLAB_RECLAIM_ACCOUNT|
						SLAB_MEM_SPREAD),
973
					     init_once);
974
	if (ext4_inode_cachep == NULL)
975 976 977 978 979 980
		return -ENOMEM;
	return 0;
}

static void destroy_inodecache(void)
{
981 982 983 984 985
	/*
	 * Make sure all delayed rcu free inodes are flushed before we
	 * destroy cache.
	 */
	rcu_barrier();
986
	kmem_cache_destroy(ext4_inode_cachep);
987 988
}

Al Viro's avatar
Al Viro committed
989
void ext4_clear_inode(struct inode *inode)
990
{
Al Viro's avatar
Al Viro committed
991
	invalidate_inode_buffers(inode);
992
	clear_inode(inode);
993
	dquot_drop(inode);
994
	ext4_discard_preallocations(inode);
995
	ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS);
996 997 998 999 1000 1001
	if (EXT4_I(inode)->jinode) {
		jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode),
					       EXT4_I(inode)->jinode);
		jbd2_free_inode(EXT4_I(inode)->jinode);
		EXT4_I(inode)->jinode = NULL;
	}
1002 1003
#ifdef CONFIG_EXT4_FS_ENCRYPTION
	if (EXT4_I(inode)->i_crypt_info)
1004
		ext4_free_encryption_info(inode, EXT4_I(inode)->i_crypt_info);
1005
#endif
1006 1007
}

Christoph Hellwig's avatar
Christoph Hellwig committed
1008
static struct inode *ext4_nfs_get_inode(struct super_block *sb,
1009
					u64 ino, u32 generation)
1010 1011 1012
{
	struct inode *inode;

1013
	if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO)
1014
		return ERR_PTR(-ESTALE);
1015
	if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count))
1016 1017 1018 1019
		return ERR_PTR(-ESTALE);

	/* iget isn't really right if the inode is currently unallocated!!
	 *
1020
	 * ext4_read_inode will return a bad_inode if the inode had been
1021 1022 1023 1024 1025
	 * deleted, so we should be safe.
	 *
	 * Currently we don't know the generation for parent directory, so
	 * a generation of 0 means "accept any"
	 */
1026
	inode = ext4_iget_normal(sb, ino);
1027 1028 1029
	if (IS_ERR(inode))
		return ERR_CAST(inode);
	if (generation && inode->i_generation != generation) {
1030 1031 1032
		iput(inode);
		return ERR_PTR(-ESTALE);
	}
Christoph Hellwig's avatar
Christoph Hellwig committed
1033 1034 1035 1036 1037

	return inode;
}

static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid,
1038
					int fh_len, int fh_type)
Christoph Hellwig's avatar
Christoph Hellwig committed
1039 1040 1041 1042 1043 1044
{
	return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
				    ext4_nfs_get_inode);
}

static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid,
1045
					int fh_len, int fh_type)
Christoph Hellwig's avatar
Christoph Hellwig committed
1046 1047 1048
{
	return generic_fh_to_parent(sb, fid, fh_len, fh_type,
				    ext4_nfs_get_inode);
1049 1050
}

1051 1052 1053 1054 1055 1056
/*
 * Try to release metadata pages (indirect blocks, directories) which are
 * mapped via the block device.  Since these pages could have journal heads
 * which would prevent try_to_free_buffers() from freeing them, we must use
 * jbd2 layer's try_to_free_buffers() function to release them.
 */
1057 1058
static int bdev_try_to_free_page(struct super_block *sb, struct page *page,
				 gfp_t wait)
1059 1060 1061 1062 1063 1064 1065 1066
{
	journal_t *journal = EXT4_SB(sb)->s_journal;

	WARN_ON(PageChecked(page));
	if (!page_has_buffers(page))
		return 0;
	if (journal)
		return jbd2_journal_try_to_free_buffers(journal, page,
1067
						wait & ~__GFP_DIRECT_RECLAIM);
1068 1069 1070
	return try_to_free_buffers(page);
}

1071
#ifdef CONFIG_QUOTA
1072
#define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group")
1073
#define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA))
1074

1075 1076 1077 1078 1079
static int ext4_write_dquot(struct dquot *dquot);
static int ext4_acquire_dquot(struct dquot *dquot);
static int ext4_release_dquot(struct dquot *dquot);
static int ext4_mark_dquot_dirty(struct dquot *dquot);
static int ext4_write_info(struct super_block *sb, int type);
1080
static int ext4_quota_on(struct super_block *sb, int type, int format_id,
1081
			 struct path *path);
1082
static int ext4_quota_off(struct super_block *sb, int type);
1083 1084
static int ext4_quota_on_mount(struct super_block *sb, int type);
static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
1085
			       size_t len, loff_t off);
1086
static ssize_t ext4_quota_write(struct super_block *sb, int type,
1087
				const char *data, size_t len, loff_t off);
1088 1089 1090
static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
			     unsigned int flags);
static int ext4_enable_quotas(struct super_block *sb);
1091

1092 1093 1094 1095 1096
static struct dquot **ext4_get_dquots(struct inode *inode)
{
	return EXT4_I(inode)->i_dquot;
}

1097
static const struct dquot_operations ext4_quota_operations = {
1098
	.get_reserved_space = ext4_get_reserved_space,
1099 1100 1101 1102
	.write_dquot	= ext4_write_dquot,
	.acquire_dquot	= ext4_acquire_dquot,
	.release_dquot	= ext4_release_dquot,
	.mark_dirty	= ext4_mark_dquot_dirty,
1103 1104 1105
	.write_info	= ext4_write_info,
	.alloc_dquot	= dquot_alloc,
	.destroy_dquot	= dquot_destroy,
1106 1107
};

1108
static const struct quotactl_ops ext4_qctl_operations = {
1109
	.quota_on	= ext4_quota_on,
1110
	.quota_off	= ext4_quota_off,
1111
	.quota_sync	= dquot_quota_sync,
1112
	.get_state	= dquot_get_state,
1113 1114 1115
	.set_info	= dquot_set_dqinfo,
	.get_dqblk	= dquot_get_dqblk,
	.set_dqblk	= dquot_set_dqblk
1116 1117 1118
};
#endif

1119
static const struct super_operations ext4_sops = {
1120 1121 1122 1123
	.alloc_inode	= ext4_alloc_inode,
	.destroy_inode	= ext4_destroy_inode,
	.write_inode	= ext4_write_inode,
	.dirty_inode	= ext4_dirty_inode,
1124
	.drop_inode	= ext4_drop_inode,
Al Viro's avatar
Al Viro committed
1125
	.evict_inode	= ext4_evict_inode,
1126 1127
	.put_super	= ext4_put_super,
	.sync_fs	= ext4_sync_fs,
1128 1129
	.freeze_fs	= ext4_freeze,
	.unfreeze_fs	= ext4_unfreeze,
1130 1131 1132
	.statfs		= ext4_statfs,
	.remount_fs	= ext4_remount,
	.show_options	= ext4_show_options,
1133
#ifdef CONFIG_QUOTA
1134 1135
	.quota_read	= ext4_quota_read,
	.quota_write	= ext4_quota_write,
1136
	.get_dquots	= ext4_get_dquots,
1137
#endif
1138
	.bdev_try_to_free_page = bdev_try_to_free_page,
1139 1140
};

1141
static const struct export_operations ext4_export_ops = {
Christoph Hellwig's avatar
Christoph Hellwig committed
1142 1143
	.fh_to_dentry = ext4_fh_to_dentry,
	.fh_to_parent = ext4_fh_to_parent,
1144
	.get_parent = ext4_get_parent,
1145 1146 1147 1148 1149
};

enum {
	Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid,
	Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
1150
	Opt_nouid32, Opt_debug, Opt_removed,
1151
	Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,
1152
	Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload,
1153 1154
	Opt_commit, Opt_min_batch_time, Opt_max_batch_time, Opt_journal_dev,
	Opt_journal_path, Opt_journal_checksum, Opt_journal_async_commit,
1155
	Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
1156
	Opt_data_err_abort, Opt_data_err_ignore, Opt_test_dummy_encryption,
1157
	Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
1158
	Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota,
Theodore Ts'o's avatar
Theodore Ts'o committed
1159
	Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err,
Ross Zwisler's avatar
Ross Zwisler committed
1160
	Opt_usrquota, Opt_grpquota, Opt_i_version, Opt_dax,
1161
	Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_mblk_io_submit,
1162
	Opt_lazytime, Opt_nolazytime,
1163
	Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity,
1164
	Opt_inode_readahead_blks, Opt_journal_ioprio,
1165
	Opt_dioread_nolock, Opt_dioread_lock,
1166
	Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable,
1167
	Opt_max_dir_size_kb, Opt_nojournal_checksum,
1168 1169
};

1170
static const match_table_t tokens = {
1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184
	{Opt_bsd_df, "bsddf"},
	{Opt_minix_df, "minixdf"},
	{Opt_grpid, "grpid"},
	{Opt_grpid, "bsdgroups"},
	{Opt_nogrpid, "nogrpid"},
	{Opt_nogrpid, "sysvgroups"},
	{Opt_resgid, "resgid=%u"},
	{Opt_resuid, "resuid=%u"},
	{Opt_sb, "sb=%u"},
	{Opt_err_cont, "errors=continue"},
	{Opt_err_panic, "errors=panic"},
	{Opt_err_ro, "errors=remount-ro"},
	{Opt_nouid32, "nouid32"},
	{Opt_debug, "debug"},
1185 1186
	{Opt_removed, "oldalloc"},
	{Opt_removed, "orlov"},
1187 1188 1189 1190
	{Opt_user_xattr, "user_xattr"},
	{Opt_nouser_xattr, "nouser_xattr"},
	{Opt_acl, "acl"},
	{Opt_noacl, "noacl"},
1191
	{Opt_noload, "norecovery"},
1192
	{Opt_noload, "noload"},
1193 1194
	{Opt_removed, "nobh"},
	{Opt_removed, "bh"},
1195
	{Opt_commit, "commit=%u"},
1196 1197
	{Opt_min_batch_time, "min_batch_time=%u"},
	{Opt_max_batch_time, "max_batch_time=%u"},
1198
	{Opt_journal_dev, "journal_dev=%u"},
1199
	{Opt_journal_path, "journal_path=%s"},
1200
	{Opt_journal_checksum, "journal_checksum"},
1201
	{Opt_nojournal_checksum, "nojournal_checksum"},
1202
	{Opt_journal_async_commit, "journal_async_commit"},
1203 1204 1205 1206
	{Opt_abort, "abort"},
	{Opt_data_journal, "data=journal"},
	{Opt_data_ordered, "data=ordered"},
	{Opt_data_writeback, "data=writeback"},
1207 1208
	{Opt_data_err_abort, "data_err=abort"},
	{Opt_data_err_ignore, "data_err=ignore"},
1209 1210 1211 1212 1213 1214
	{Opt_offusrjquota, "usrjquota="},
	{Opt_usrjquota, "usrjquota=%s"},
	{Opt_offgrpjquota, "grpjquota="},
	{Opt_grpjquota, "grpjquota=%s"},
	{Opt_jqfmt_vfsold, "jqfmt=vfsold"},
	{Opt_jqfmt_vfsv0, "jqfmt=vfsv0"},
1215
	{Opt_jqfmt_vfsv1, "jqfmt=vfsv1"},
1216 1217 1218 1219 1220
	{Opt_grpquota, "grpquota"},
	{Opt_noquota, "noquota"},
	{Opt_quota, "quota"},
	{Opt_usrquota, "usrquota"},
	{Opt_barrier, "barrier=%u"},
1221 1222
	{Opt_barrier, "barrier"},
	{Opt_nobarrier, "nobarrier"},
1223
	{Opt_i_version, "i_version"},
Ross Zwisler's avatar
Ross Zwisler committed
1224
	{Opt_dax, "dax"},
1225
	{Opt_stripe, "stripe=%u"},
1226
	{Opt_delalloc, "delalloc"},
1227 1228
	{Opt_lazytime, "lazytime"},
	{Opt_nolazytime, "nolazytime"},
1229
	{Opt_nodelalloc, "nodelalloc"},
1230 1231
	{Opt_removed, "mblk_io_submit"},
	{Opt_removed, "nomblk_io_submit"},
1232 1233
	{Opt_block_validity, "block_validity"},
	{Opt_noblock_validity, "noblock_validity"},
1234
	{Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
1235
	{Opt_journal_ioprio, "journal_ioprio=%u"},
1236
	{Opt_auto_da_alloc, "auto_da_alloc=%u"},
1237 1238
	{Opt_auto_da_alloc, "auto_da_alloc"},
	{Opt_noauto_da_alloc, "noauto_da_alloc"},
1239 1240
	{Opt_dioread_nolock, "dioread_nolock"},
	{Opt_dioread_lock, "dioread_lock"},
1241 1242
	{Opt_discard, "discard"},
	{Opt_nodiscard, "nodiscard"},
1243 1244 1245
	{Opt_init_itable, "init_itable=%u"},
	{Opt_init_itable, "init_itable"},
	{Opt_noinit_itable, "noinit_itable"},
1246
	{Opt_max_dir_size_kb, "max_dir_size_kb=%u"},
1247
	{Opt_test_dummy_encryption, "test_dummy_encryption"},
1248 1249 1250 1251 1252
	{Opt_removed, "check=none"},	/* mount option from ext2/3 */
	{Opt_removed, "nocheck"},	/* mount option from ext2/3 */
	{Opt_removed, "reservation"},	/* mount option from ext2/3 */
	{Opt_removed, "noreservation"}, /* mount option from ext2/3 */
	{Opt_removed, "journal=%u"},	/* mount option from ext2/3 */
Josef Bacik's avatar
Josef Bacik committed
1253
	{Opt_err, NULL},
1254 1255
};

1256
static ext4_fsblk_t get_sb_block(void **data)
1257
{
1258
	ext4_fsblk_t	sb_block;
1259 1260 1261 1262
	char		*options = (char *) *data;

	if (!options || strncmp(options, "sb=", 3) != 0)
		return 1;	/* Default location */
1263

1264
	options += 3;
1265
	/* TODO: use simple_strtoll with >32bit ext4 */
1266 1267
	sb_block = simple_strtoul(options, &options, 0);
	if (*options && *options != ',') {
1268
		printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n",
1269 1270 1271 1272 1273 1274
		       (char *) *data);
		return 1;
	}
	if (*options == ',')
		options++;
	*data = (void *) options;
1275

1276 1277 1278
	return sb_block;
}

1279
#define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
1280 1281
static char deprecated_msg[] = "Mount option \"%s\" will be removed by %s\n"
	"Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
1282

1283 1284 1285 1286 1287
#ifdef CONFIG_QUOTA
static int set_qf_name(struct super_block *sb, int qtype, substring_t *args)
{
	struct ext4_sb_info *sbi = EXT4_SB(sb);
	char *qname;
1288
	int ret = -1;
1289 1290 1291 1292 1293 1294

	if (sb_any_quota_loaded(sb) &&
		!sbi->s_qf_names[qtype]) {
		ext4_msg(sb, KERN_ERR,
			"Cannot change journaled "
			"quota options when quota turned on");
1295
		return -1;
1296
	}
1297
	if (ext4_has_feature_quota(sb)) {
1298 1299 1300
		ext4_msg(sb, KERN_INFO, "Journaled quota options "
			 "ignored when QUOTA feature is enabled");
		return 1;
1301
	}
1302 1303 1304 1305
	qname = match_strdup(args);
	if (!qname) {
		ext4_msg(sb, KERN_ERR,
			"Not enough memory for storing quotafile name");
1306
		return -1;
1307
	}
1308 1309 1310 1311 1312 1313 1314 1315
	if (sbi->s_qf_names[qtype]) {
		if (strcmp(sbi->s_qf_names[qtype], qname) == 0)
			ret = 1;
		else
			ext4_msg(sb, KERN_ERR,
				 "%s quota file already specified",
				 QTYPE2NAME(qtype));
		goto errout;
1316
	}
1317
	if (strchr(qname, '/')) {
1318 1319
		ext4_msg(sb, KERN_ERR,
			"quotafile must be on filesystem root");
1320
		goto errout;
1321
	}
1322
	sbi->s_qf_names[qtype] = qname;
1323
	set_opt(sb, QUOTA);
1324
	return 1;
1325 1326 1327
errout:
	kfree(qname);
	return ret;
1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338
}

static int clear_qf_name(struct super_block *sb, int qtype)
{

	struct ext4_sb_info *sbi = EXT4_SB(sb);

	if (sb_any_quota_loaded(sb) &&
		sbi->s_qf_names[qtype]) {
		ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options"
			" when quota turned on");
1339
		return -1;
1340
	}
1341
	kfree(sbi->s_qf_names[qtype]);
1342 1343 1344 1345 1346
	sbi->s_qf_names[qtype] = NULL;
	return 1;
}
#endif

1347 1348 1349 1350 1351 1352
#define MOPT_SET	0x0001
#define MOPT_CLEAR	0x0002
#define MOPT_NOSUPPORT	0x0004
#define MOPT_EXPLICIT	0x0008
#define MOPT_CLEAR_ERR	0x0010
#define MOPT_GTE0	0x0020
1353
#ifdef CONFIG_QUOTA
1354 1355 1356 1357 1358
#define MOPT_Q		0
#define MOPT_QFMT	0x0040
#else
#define MOPT_Q		MOPT_NOSUPPORT
#define MOPT_QFMT	MOPT_NOSUPPORT
1359
#endif
1360
#define MOPT_DATAJ	0x0080
1361 1362 1363
#define MOPT_NO_EXT2	0x0100
#define MOPT_NO_EXT3	0x0200
#define MOPT_EXT4_ONLY	(MOPT_NO_EXT2 | MOPT_NO_EXT3)
1364
#define MOPT_STRING	0x0400
1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376

static const struct mount_opts {
	int	token;
	int	mount_opt;
	int	flags;
} ext4_mount_opts[] = {
	{Opt_minix_df, EXT4_MOUNT_MINIX_DF, MOPT_SET},
	{Opt_bsd_df, EXT4_MOUNT_MINIX_DF, MOPT_CLEAR},
	{Opt_grpid, EXT4_MOUNT_GRPID, MOPT_SET},
	{Opt_nogrpid, EXT4_MOUNT_GRPID, MOPT_CLEAR},
	{Opt_block_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_SET},
	{Opt_noblock_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_CLEAR},
1377 1378 1379 1380
	{Opt_dioread_nolock, EXT4_MOUNT_DIOREAD_NOLOCK,
	 MOPT_EXT4_ONLY | MOPT_SET},
	{Opt_dioread_lock, EXT4_MOUNT_DIOREAD_NOLOCK,
	 MOPT_EXT4_ONLY | MOPT_CLEAR},
1381 1382
	{Opt_discard, EXT4_MOUNT_DISCARD, MOPT_SET},
	{Opt_nodiscard, EXT4_MOUNT_DISCARD, MOPT_CLEAR},
1383 1384 1385
	{Opt_delalloc, EXT4_MOUNT_DELALLOC,
	 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
	{Opt_nodelalloc, EXT4_MOUNT_DELALLOC,
1386
	 MOPT_EXT4_ONLY | MOPT_CLEAR},
1387 1388
	{Opt_nojournal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
	 MOPT_EXT4_ONLY | MOPT_CLEAR},
1389
	{Opt_journal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM,
1390
	 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
1391
	{Opt_journal_async_commit, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT |
1392
				    EXT4_MOUNT_JOURNAL_CHECKSUM),
1393
	 MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT},
1394
	{Opt_noload, EXT4_MOUNT_NOLOAD, MOPT_NO_EXT2 | MOPT_SET},
1395 1396 1397
	{Opt_err_panic, EXT4_MOUNT_ERRORS_PANIC, MOPT_SET | MOPT_CLEAR_ERR},
	{Opt_err_ro, EXT4_MOUNT_ERRORS_RO, MOPT_SET | MOPT_CLEAR_ERR},
	{Opt_err_cont, EXT4_MOUNT_ERRORS_CONT, MOPT_SET | MOPT_CLEAR_ERR},
1398 1399 1400 1401
	{Opt_data_err_abort, EXT4_MOUNT_DATA_ERR_ABORT,
	 MOPT_NO_EXT2 | MOPT_SET},
	{Opt_data_err_ignore, EXT4_MOUNT_DATA_ERR_ABORT,
	 MOPT_NO_EXT2 | MOPT_CLEAR},
1402 1403 1404 1405 1406 1407 1408 1409 1410 1411
	{Opt_barrier, EXT4_MOUNT_BARRIER, MOPT_SET},
	{Opt_nobarrier, EXT4_MOUNT_BARRIER, MOPT_CLEAR},
	{Opt_noauto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_SET},
	{Opt_auto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_CLEAR},
	{Opt_noinit_itable, EXT4_MOUNT_INIT_INODE_TABLE, MOPT_CLEAR},
	{Opt_commit, 0, MOPT_GTE0},
	{Opt_max_batch_time, 0, MOPT_GTE0},
	{Opt_min_batch_time, 0, MOPT_GTE0},
	{Opt_inode_readahead_blks, 0, MOPT_GTE0},
	{Opt_init_itable, 0, MOPT_GTE0},
Ross Zwisler's avatar
Ross Zwisler committed
1412
	{Opt_dax, EXT4_MOUNT_DAX, MOPT_SET},
1413
	{Opt_stripe, 0, MOPT_GTE0},
1414 1415
	{Opt_resuid, 0, MOPT_GTE0},
	{Opt_resgid, 0, MOPT_GTE0},
1416 1417 1418
	{Opt_journal_dev, 0, MOPT_NO_EXT2 | MOPT_GTE0},
	{Opt_journal_path, 0, MOPT_NO_EXT2 | MOPT_STRING},
	{Opt_journal_ioprio, 0, MOPT_NO_EXT2 | MOPT_GTE0},
1419 1420 1421 1422
	{Opt_data_journal, EXT4_MOUNT_JOURNAL_DATA, MOPT_NO_EXT2 | MOPT_DATAJ},
	{Opt_data_ordered, EXT4_MOUNT_ORDERED_DATA, MOPT_NO_EXT2 | MOPT_DATAJ},
	{Opt_data_writeback, EXT4_MOUNT_WRITEBACK_DATA,
	 MOPT_NO_EXT2 | MOPT_DATAJ},
1423 1424
	{Opt_user_xattr, EXT4_MOUNT_XATTR_USER, MOPT_SET},
	{Opt_nouser_xattr, EXT4_MOUNT_XATTR_USER, MOPT_CLEAR},
Theodore Ts'o's avatar
Theodore Ts'o committed
1425
#ifdef CONFIG_EXT4_FS_POSIX_ACL
1426 1427
	{Opt_acl, EXT4_MOUNT_POSIX_ACL, MOPT_SET},
	{Opt_noacl, EXT4_MOUNT_POSIX_ACL, MOPT_CLEAR},
1428
#else
1429 1430
	{Opt_acl, 0, MOPT_NOSUPPORT},
	{Opt_noacl, 0, MOPT_NOSUPPORT},
1431
#endif
1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447
	{Opt_nouid32, EXT4_MOUNT_NO_UID32, MOPT_SET},
	{Opt_debug, EXT4_MOUNT_DEBUG, MOPT_SET},
	{Opt_quota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA, MOPT_SET | MOPT_Q},
	{Opt_usrquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA,
							MOPT_SET | MOPT_Q},
	{Opt_grpquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_GRPQUOTA,
							MOPT_SET | MOPT_Q},
	{Opt_noquota, (EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA |
		       EXT4_MOUNT_GRPQUOTA), MOPT_CLEAR | MOPT_Q},
	{Opt_usrjquota, 0, MOPT_Q},
	{Opt_grpjquota, 0, MOPT_Q},
	{Opt_offusrjquota, 0, MOPT_Q},
	{Opt_offgrpjquota, 0, MOPT_Q},
	{Opt_jqfmt_vfsold, QFMT_VFS_OLD, MOPT_QFMT},
	{Opt_jqfmt_vfsv0, QFMT_VFS_V0, MOPT_QFMT},
	{Opt_jqfmt_vfsv1, QFMT_VFS_V1, MOPT_QFMT},
1448
	{Opt_max_dir_size_kb, 0, MOPT_GTE0},
1449
	{Opt_test_dummy_encryption, 0, MOPT_GTE0},
1450 1451 1452 1453 1454 1455 1456 1457 1458
	{Opt_err, 0, 0}
};

static int handle_mount_opt(struct super_block *sb, char *opt, int token,
			    substring_t *args, unsigned long *journal_devnum,
			    unsigned int *journal_ioprio, int is_remount)
{
	struct ext4_sb_info *sbi = EXT4_SB(sb);
	const struct mount_opts *m;
1459 1460
	kuid_t uid;
	kgid_t gid;
1461 1462
	int arg = 0;

1463 1464 1465 1466 1467 1468 1469 1470 1471 1472
#ifdef CONFIG_QUOTA
	if (token == Opt_usrjquota)
		return set_qf_name(sb, USRQUOTA, &args[0]);
	else if (token == Opt_grpjquota)
		return set_qf_name(sb, GRPQUOTA, &args[0]);
	else if (token == Opt_offusrjquota)
		return clear_qf_name(sb, USRQUOTA);
	else if (token == Opt_offgrpjquota)
		return clear_qf_name(sb, GRPQUOTA);
#endif
1473
	switch (token) {
1474 1475 1476 1477
	case Opt_noacl:
	case Opt_nouser_xattr:
		ext4_msg(sb, KERN_WARNING, deprecated_msg, opt, "3.5");
		break;
1478 1479 1480
	case Opt_sb:
		return 1;	/* handled by get_sb_block() */
	case Opt_removed:
1481
		ext4_msg(sb, KERN_WARNING, "Ignoring removed %s option", opt);
1482 1483 1484 1485 1486 1487 1488
		return 1;
	case Opt_abort:
		sbi->s_mount_flags |= EXT4_MF_FS_ABORTED;
		return 1;
	case Opt_i_version:
		sb->s_flags |= MS_I_VERSION;
		return 1;
1489 1490 1491 1492 1493 1494
	case Opt_lazytime:
		sb->s_flags |= MS_LAZYTIME;
		return 1;
	case Opt_nolazytime:
		sb->s_flags &= ~MS_LAZYTIME;
		return 1;
1495 1496
	}

1497 1498 1499 1500 1501 1502 1503 1504 1505 1506
	for (m = ext4_mount_opts; m->token != Opt_err; m++)
		if (token == m->token)
			break;

	if (m->token == Opt_err) {
		ext4_msg(sb, KERN_ERR, "Unrecognized mount option \"%s\" "
			 "or missing value", opt);
		return -1;
	}

1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517
	if ((m->flags & MOPT_NO_EXT2) && IS_EXT2_SB(sb)) {
		ext4_msg(sb, KERN_ERR,
			 "Mount option \"%s\" incompatible with ext2", opt);
		return -1;
	}
	if ((m->flags & MOPT_NO_EXT3) && IS_EXT3_SB(sb)) {
		ext4_msg(sb, KERN_ERR,
			 "Mount option \"%s\" incompatible with ext3", opt);
		return -1;
	}

1518
	if (args->from && !(m->flags & MOPT_STRING) && match_int(args, &arg))
1519 1520 1521
		return -1;
	if (args->from && (m->flags & MOPT_GTE0) && (arg < 0))
		return -1;
1522 1523 1524
	if (m->flags & MOPT_EXPLICIT) {
		if (m->mount_opt & EXT4_MOUNT_DELALLOC) {
			set_opt2(sb, EXPLICIT_DELALLOC);
1525 1526
		} else if (m->mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) {
			set_opt2(sb, EXPLICIT_JOURNAL_CHECKSUM);
1527 1528 1529
		} else
			return -1;
	}
1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548
	if (m->flags & MOPT_CLEAR_ERR)
		clear_opt(sb, ERRORS_MASK);
	if (token == Opt_noquota && sb_any_quota_loaded(sb)) {
		ext4_msg(sb, KERN_ERR, "Cannot change quota "
			 "options when quota turned on");
		return -1;
	}

	if (m->flags & MOPT_NOSUPPORT) {
		ext4_msg(sb, KERN_ERR, "%s option not supported", opt);
	} else if (token == Opt_commit) {
		if (arg == 0)
			arg = JBD2_DEFAULT_MAX_COMMIT_AGE;
		sbi->s_commit_interval = HZ * arg;
	} else if (token == Opt_max_batch_time) {
		sbi->s_max_batch_time = arg;
	} else if (token == Opt_min_batch_time) {
		sbi->s_min_batch_time = arg;
	} else if (token == Opt_inode_readahead_blks) {
1549 1550 1551 1552
		if (arg && (arg > (1 << 30) || !is_power_of_2(arg))) {
			ext4_msg(sb, KERN_ERR,
				 "EXT4-fs: inode_readahead_blks must be "
				 "0 or a power of 2 smaller than 2^31");
1553
			return -1;
1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568
		}
		sbi->s_inode_readahead_blks = arg;
	} else if (token == Opt_init_itable) {
		set_opt(sb, INIT_INODE_TABLE);
		if (!args->from)
			arg = EXT4_DEF_LI_WAIT_MULT;
		sbi->s_li_wait_mult = arg;
	} else if (token == Opt_max_dir_size_kb) {
		sbi->s_max_dir_size_kb = arg;
	} else if (token == Opt_stripe) {
		sbi->s_stripe = arg;
	} else if (token == Opt_resuid) {
		uid = make_kuid(current_user_ns(), arg);
		if (!uid_valid(uid)) {
			ext4_msg(sb, KERN_ERR, "Invalid uid value %d", arg);
1569 1570
			return -1;
		}
1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585
		sbi->s_resuid = uid;
	} else if (token == Opt_resgid) {
		gid = make_kgid(current_user_ns(), arg);
		if (!gid_valid(gid)) {
			ext4_msg(sb, KERN_ERR, "Invalid gid value %d", arg);
			return -1;
		}
		sbi->s_resgid = gid;
	} else if (token == Opt_journal_dev) {
		if (is_remount) {
			ext4_msg(sb, KERN_ERR,
				 "Cannot specify journal on remount");
			return -1;
		}
		*journal_devnum = arg;
1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611
	} else if (token == Opt_journal_path) {
		char *journal_path;
		struct inode *journal_inode;
		struct path path;
		int error;

		if (is_remount) {
			ext4_msg(sb, KERN_ERR,
				 "Cannot specify journal on remount");
			return -1;
		}
		journal_path = match_strdup(&args[0]);
		if (!journal_path) {
			ext4_msg(sb, KERN_ERR, "error: could not dup "
				"journal device string");
			return -1;
		}

		error = kern_path(journal_path, LOOKUP_FOLLOW, &path);
		if (error) {
			ext4_msg(sb, KERN_ERR, "error: could not find "
				"journal device path: error %d", error);
			kfree(journal_path);
			return -1;
		}

1612
		journal_inode = d_inode(path.dentry);
1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623
		if (!S_ISBLK(journal_inode->i_mode)) {
			ext4_msg(sb, KERN_ERR, "error: journal path %s "
				"is not a block device", journal_path);
			path_put(&path);
			kfree(journal_path);
			return -1;
		}

		*journal_devnum = new_encode_dev(journal_inode->i_rdev);
		path_put(&path);
		kfree(journal_path);
1624 1625 1626 1627 1628 1629 1630 1631
	} else if (token == Opt_journal_ioprio) {
		if (arg > 7) {
			ext4_msg(sb, KERN_ERR, "Invalid journal IO priority"
				 " (must be 0-7)");
			return -1;
		}
		*journal_ioprio =
			IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, arg);
1632 1633 1634 1635 1636 1637 1638 1639 1640
	} else if (token == Opt_test_dummy_encryption) {
#ifdef CONFIG_EXT4_FS_ENCRYPTION
		sbi->s_mount_flags |= EXT4_MF_TEST_DUMMY_ENCRYPTION;
		ext4_msg(sb, KERN_WARNING,
			 "Test dummy encryption mode enabled");
#else
		ext4_msg(sb, KERN_WARNING,
			 "Test dummy encryption mount option ignored");
#endif
1641 1642 1643 1644 1645
	} else if (m->flags & MOPT_DATAJ) {
		if (is_remount) {
			if (!sbi->s_journal)
				ext4_msg(sb, KERN_WARNING, "Remounting file system with no journal so ignoring journalled data option");
			else if (test_opt(sb, DATA_FLAGS) != m->mount_opt) {
1646
				ext4_msg(sb, KERN_ERR,
1647 1648
					 "Cannot change data mode on remount");
				return -1;
1649
			}
1650
		} else {
1651 1652
			clear_opt(sb, DATA_FLAGS);
			sbi->s_mount_opt |= m->mount_opt;
1653
		}
1654 1655 1656 1657 1658 1659 1660 1661
#ifdef CONFIG_QUOTA
	} else if (m->flags & MOPT_QFMT) {
		if (sb_any_quota_loaded(sb) &&
		    sbi->s_jquota_fmt != m->mount_opt) {
			ext4_msg(sb, KERN_ERR, "Cannot change journaled "
				 "quota options when quota turned on");
			return -1;
		}
1662
		if (ext4_has_feature_quota(sb)) {
1663 1664
			ext4_msg(sb, KERN_INFO,
				 "Quota format mount options ignored "
1665
				 "when QUOTA feature is enabled");
1666
			return 1;
1667
		}
1668
		sbi->s_jquota_fmt = m->mount_opt;
Ross Zwisler's avatar
Ross Zwisler committed
1669 1670
#endif
	} else if (token == Opt_dax) {
1671 1672 1673 1674 1675
#ifdef CONFIG_FS_DAX
		ext4_msg(sb, KERN_WARNING,
		"DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
			sbi->s_mount_opt |= m->mount_opt;
#else
Ross Zwisler's avatar
Ross Zwisler committed
1676 1677
		ext4_msg(sb, KERN_INFO, "dax option not supported");
		return -1;
1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693
#endif
	} else {
		if (!args->from)
			arg = 1;
		if (m->flags & MOPT_CLEAR)
			arg = !arg;
		else if (unlikely(!(m->flags & MOPT_SET))) {
			ext4_msg(sb, KERN_WARNING,
				 "buggy handling of option %s", opt);
			WARN_ON(1);
			return -1;
		}
		if (arg != 0)
			sbi->s_mount_opt |= m->mount_opt;
		else
			sbi->s_mount_opt &= ~m->mount_opt;
1694
	}
1695
	return 1;
1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717
}

static int parse_options(char *options, struct super_block *sb,
			 unsigned long *journal_devnum,
			 unsigned int *journal_ioprio,
			 int is_remount)
{
	struct ext4_sb_info *sbi = EXT4_SB(sb);
	char *p;
	substring_t args[MAX_OPT_ARGS];
	int token;

	if (!options)
		return 1;

	while ((p = strsep(&options, ",")) != NULL) {
		if (!*p)
			continue;
		/*
		 * Initialize args struct so we know whether arg was
		 * found; some options take optional arguments.
		 */
1718
		args[0].to = args[0].from = NULL;
1719 1720 1721 1722
		token = match_token(p, tokens, args);
		if (handle_mount_opt(sb, p, token, args, journal_devnum,
				     journal_ioprio, is_remount) < 0)
			return 0;
1723 1724
	}
#ifdef CONFIG_QUOTA
1725
	if (ext4_has_feature_quota(sb) &&
1726
	    (test_opt(sb, USRQUOTA) || test_opt(sb, GRPQUOTA))) {
1727 1728 1729 1730 1731
		ext4_msg(sb, KERN_INFO, "Quota feature enabled, usrquota and grpquota "
			 "mount options ignored.");
		clear_opt(sb, USRQUOTA);
		clear_opt(sb, GRPQUOTA);
	} else if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
1732
		if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA])
1733
			clear_opt(sb, USRQUOTA);
1734

1735
		if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA])
1736
			clear_opt(sb, GRPQUOTA);
1737

1738
		if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) {
1739 1740
			ext4_msg(sb, KERN_ERR, "old and new quota "
					"format mixing");
1741 1742 1743 1744
			return 0;
		}

		if (!sbi->s_jquota_fmt) {
1745 1746
			ext4_msg(sb, KERN_ERR, "journaled quota format "
					"not specified");
1747 1748 1749 1750
			return 0;
		}
	}
#endif
1751 1752 1753 1754 1755 1756 1757 1758 1759 1760
	if (test_opt(sb, DIOREAD_NOLOCK)) {
		int blocksize =
			BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);

		if (blocksize < PAGE_CACHE_SIZE) {
			ext4_msg(sb, KERN_ERR, "can't mount with "
				 "dioread_nolock if block size != PAGE_SIZE");
			return 0;
		}
	}
1761 1762 1763 1764 1765 1766
	if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA &&
	    test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
		ext4_msg(sb, KERN_ERR, "can't mount with journal_async_commit "
			 "in data=ordered mode");
		return 0;
	}
1767 1768 1769
	return 1;
}

1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793
static inline void ext4_show_quota_options(struct seq_file *seq,
					   struct super_block *sb)
{
#if defined(CONFIG_QUOTA)
	struct ext4_sb_info *sbi = EXT4_SB(sb);

	if (sbi->s_jquota_fmt) {
		char *fmtname = "";

		switch (sbi->s_jquota_fmt) {
		case QFMT_VFS_OLD:
			fmtname = "vfsold";
			break;
		case QFMT_VFS_V0:
			fmtname = "vfsv0";
			break;
		case QFMT_VFS_V1:
			fmtname = "vfsv1";
			break;
		}
		seq_printf(seq, ",jqfmt=%s", fmtname);
	}

	if (sbi->s_qf_names[USRQUOTA])
1794
		seq_show_option(seq, "usrjquota", sbi->s_qf_names[USRQUOTA]);
1795 1796

	if (sbi->s_qf_names[GRPQUOTA])
1797
		seq_show_option(seq, "grpjquota", sbi->s_qf_names[GRPQUOTA]);
1798 1799 1800
#endif
}

1801 1802
static const char *token2str(int token)
{
1803
	const struct match_token *t;
1804 1805 1806 1807 1808 1809 1810

	for (t = tokens; t->token != Opt_err; t++)
		if (t->token == token && !strchr(t->pattern, '='))
			break;
	return t->pattern;
}

1811 1812 1813 1814 1815
/*
 * Show an option if
 *  - it's set to a non-default value OR
 *  - if the per-sb default is different from the global default
 */
1816 1817
static int _ext4_show_options(struct seq_file *seq, struct super_block *sb,
			      int nodefs)
1818 1819 1820
{
	struct ext4_sb_info *sbi = EXT4_SB(sb);
	struct ext4_super_block *es = sbi->s_es;
1821
	int def_errors, def_mount_opt = nodefs ? 0 : sbi->s_def_mount_opt;
1822
	const struct mount_opts *m;
1823
	char sep = nodefs ? '\n' : ',';
1824

1825 1826
#define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep)
#define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg)
1827 1828

	if (sbi->s_sb_block != 1)
1829 1830 1831 1832 1833 1834 1835
		SEQ_OPTS_PRINT("sb=%llu", sbi->s_sb_block);

	for (m = ext4_mount_opts; m->token != Opt_err; m++) {
		int want_set = m->flags & MOPT_SET;
		if (((m->flags & (MOPT_SET|MOPT_CLEAR)) == 0) ||
		    (m->flags & MOPT_CLEAR_ERR))
			continue;
1836
		if (!(m->mount_opt & (sbi->s_mount_opt ^ def_mount_opt)))
1837 1838 1839 1840 1841 1842
			continue; /* skip if same as the default */
		if ((want_set &&
		     (sbi->s_mount_opt & m->mount_opt) != m->mount_opt) ||
		    (!want_set && (sbi->s_mount_opt & m->mount_opt)))
			continue; /* select Opt_noFoo vs Opt_Foo */
		SEQ_OPTS_PRINT("%s", token2str(m->token));
1843
	}
1844

1845
	if (nodefs || !uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT4_DEF_RESUID)) ||
1846
	    le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID)
1847 1848 1849
		SEQ_OPTS_PRINT("resuid=%u",
				from_kuid_munged(&init_user_ns, sbi->s_resuid));
	if (nodefs || !gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT4_DEF_RESGID)) ||
1850
	    le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID)
1851 1852
		SEQ_OPTS_PRINT("resgid=%u",
				from_kgid_munged(&init_user_ns, sbi->s_resgid));
1853
	def_errors = nodefs ? -1 : le16_to_cpu(es->s_errors);
1854 1855
	if (test_opt(sb, ERRORS_RO) && def_errors != EXT4_ERRORS_RO)
		SEQ_OPTS_PUTS("errors=remount-ro");
1856
	if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE)
1857
		SEQ_OPTS_PUTS("errors=continue");
1858
	if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC)
1859
		SEQ_OPTS_PUTS("errors=panic");
1860
	if (nodefs || sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ)
1861
		SEQ_OPTS_PRINT("commit=%lu", sbi->s_commit_interval / HZ);
1862
	if (nodefs || sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME)
1863
		SEQ_OPTS_PRINT("min_batch_time=%u", sbi->s_min_batch_time);
1864
	if (nodefs || sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME)
1865
		SEQ_OPTS_PRINT("max_batch_time=%u", sbi->s_max_batch_time);
1866
	if (sb->s_flags & MS_I_VERSION)
1867
		SEQ_OPTS_PUTS("i_version");
1868
	if (nodefs || sbi->s_stripe)
1869
		SEQ_OPTS_PRINT("stripe=%lu", sbi->s_stripe);
1870
	if (EXT4_MOUNT_DATA_FLAGS & (sbi->s_mount_opt ^ def_mount_opt)) {
1871 1872 1873 1874 1875 1876 1877
		if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
			SEQ_OPTS_PUTS("data=journal");
		else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
			SEQ_OPTS_PUTS("data=ordered");
		else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA)
			SEQ_OPTS_PUTS("data=writeback");
	}
1878 1879
	if (nodefs ||
	    sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS)
1880 1881
		SEQ_OPTS_PRINT("inode_readahead_blks=%u",
			       sbi->s_inode_readahead_blks);
1882

1883 1884
	if (nodefs || (test_opt(sb, INIT_INODE_TABLE) &&
		       (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT)))
1885
		SEQ_OPTS_PRINT("init_itable=%u", sbi->s_li_wait_mult);
1886 1887
	if (nodefs || sbi->s_max_dir_size_kb)
		SEQ_OPTS_PRINT("max_dir_size_kb=%u", sbi->s_max_dir_size_kb);
1888 1889 1890 1891 1892

	ext4_show_quota_options(seq, sb);
	return 0;
}

1893 1894 1895 1896 1897
static int ext4_show_options(struct seq_file *seq, struct dentry *root)
{
	return _ext4_show_options(seq, root->d_sb, 0);
}

1898
int ext4_seq_options_show(struct seq_file *seq, void *offset)
1899 1900 1901 1902 1903 1904 1905 1906 1907 1908
{
	struct super_block *sb = seq->private;
	int rc;

	seq_puts(seq, (sb->s_flags & MS_RDONLY) ? "ro" : "rw");
	rc = _ext4_show_options(seq, sb, 1);
	seq_puts(seq, "\n");
	return rc;
}

1909
static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
1910 1911
			    int read_only)
{
1912
	struct ext4_sb_info *sbi = EXT4_SB(sb);
1913 1914
	int res = 0;

1915
	if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) {
1916 1917
		ext4_msg(sb, KERN_ERR, "revision level too high, "
			 "forcing read-only mode");
1918 1919 1920
		res = MS_RDONLY;
	}
	if (read_only)
1921
		goto done;
1922
	if (!(sbi->s_mount_state & EXT4_VALID_FS))
1923 1924
		ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, "
			 "running e2fsck is recommended");
1925
	else if (sbi->s_mount_state & EXT4_ERROR_FS)
1926 1927 1928
		ext4_msg(sb, KERN_WARNING,
			 "warning: mounting fs with errors, "
			 "running e2fsck is recommended");
1929
	else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 &&
1930 1931
		 le16_to_cpu(es->s_mnt_count) >=
		 (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count))
1932 1933 1934
		ext4_msg(sb, KERN_WARNING,
			 "warning: maximal mount count reached, "
			 "running e2fsck is recommended");
1935 1936 1937
	else if (le32_to_cpu(es->s_checkinterval) &&
		(le32_to_cpu(es->s_lastcheck) +
			le32_to_cpu(es->s_checkinterval) <= get_seconds()))
1938 1939 1940
		ext4_msg(sb, KERN_WARNING,
			 "warning: checktime reached, "
			 "running e2fsck is recommended");
1941
	if (!sbi->s_journal)
1942
		es->s_state &= cpu_to_le16(~EXT4_VALID_FS);
1943
	if (!(__s16) le16_to_cpu(es->s_max_mnt_count))
1944
		es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT);
1945
	le16_add_cpu(&es->s_mnt_count, 1);
1946
	es->s_mtime = cpu_to_le32(get_seconds());
1947
	ext4_update_dynamic_rev(sb);
1948
	if (sbi->s_journal)
1949
		ext4_set_feature_journal_needs_recovery(sb);
1950

1951
	ext4_commit_super(sb, 1);
1952
done:
1953
	if (test_opt(sb, DEBUG))
1954
		printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, "
1955
				"bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n",
1956 1957
			sb->s_blocksize,
			sbi->s_groups_count,
1958 1959
			EXT4_BLOCKS_PER_GROUP(sb),
			EXT4_INODES_PER_GROUP(sb),
1960
			sbi->s_mount_opt, sbi->s_mount_opt2);
1961

1962
	cleancache_init_fs(sb);
1963 1964 1965
	return res;
}

1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990
int ext4_alloc_flex_bg_array(struct super_block *sb, ext4_group_t ngroup)
{
	struct ext4_sb_info *sbi = EXT4_SB(sb);
	struct flex_groups *new_groups;
	int size;

	if (!sbi->s_log_groups_per_flex)
		return 0;

	size = ext4_flex_group(sbi, ngroup - 1) + 1;
	if (size <= sbi->s_flex_groups_allocated)
		return 0;

	size = roundup_pow_of_two(size * sizeof(struct flex_groups));
	new_groups = ext4_kvzalloc(size, GFP_KERNEL);
	if (!new_groups) {
		ext4_msg(sb, KERN_ERR, "not enough memory for %d flex groups",
			 size / (int) sizeof(struct flex_groups));
		return -ENOMEM;
	}

	if (sbi->s_flex_groups) {
		memcpy(new_groups, sbi->s_flex_groups,
		       (sbi->s_flex_groups_allocated *
			sizeof(struct flex_groups)));
Al Viro's avatar
Al Viro committed
1991
		kvfree(sbi->s_flex_groups);
1992 1993 1994 1995 1996 1997
	}
	sbi->s_flex_groups = new_groups;
	sbi->s_flex_groups_allocated = size / sizeof(struct flex_groups);
	return 0;
}

1998 1999 2000 2001 2002
static int ext4_fill_flex_info(struct super_block *sb)
{
	struct ext4_sb_info *sbi = EXT4_SB(sb);
	struct ext4_group_desc *gdp = NULL;
	ext4_group_t flex_group;
2003
	int i, err;
2004

2005
	sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
2006
	if (sbi->s_log_groups_per_flex < 1 || sbi->s_log_groups_per_flex > 31) {
2007 2008 2009 2010
		sbi->s_log_groups_per_flex = 0;
		return 1;
	}

2011 2012
	err = ext4_alloc_flex_bg_array(sb, sbi->s_groups_count);
	if (err)
2013
		goto failed;
2014 2015

	for (i = 0; i < sbi->s_groups_count; i++) {
2016
		gdp = ext4_get_group_desc(sb, i, NULL);
2017 2018

		flex_group = ext4_flex_group(sbi, i);
2019 2020
		atomic_add(ext4_free_inodes_count(sb, gdp),
			   &sbi->s_flex_groups[flex_group].free_inodes);
2021 2022
		atomic64_add(ext4_free_group_clusters(sb, gdp),
			     &sbi->s_flex_groups[flex_group].free_clusters);
2023 2024
		atomic_add(ext4_used_dirs_count(sb, gdp),
			   &sbi->s_flex_groups[flex_group].used_dirs);
2025 2026 2027 2028 2029 2030 2031
	}

	return 1;
failed:
	return 0;
}

2032
static __le16 ext4_group_desc_csum(struct super_block *sb, __u32 block_group,
2033
				   struct ext4_group_desc *gdp)
2034
{
2035
	int offset = offsetof(struct ext4_group_desc, bg_checksum);
2036
	__u16 crc = 0;
2037
	__le32 le_group = cpu_to_le32(block_group);
2038
	struct ext4_sb_info *sbi = EXT4_SB(sb);
2039

2040
	if (ext4_has_metadata_csum(sbi->s_sb)) {
2041 2042
		/* Use new metadata_csum algorithm */
		__u32 csum32;
2043
		__u16 dummy_csum = 0;
2044 2045 2046

		csum32 = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&le_group,
				     sizeof(le_group));
2047 2048 2049 2050 2051 2052 2053
		csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp, offset);
		csum32 = ext4_chksum(sbi, csum32, (__u8 *)&dummy_csum,
				     sizeof(dummy_csum));
		offset += sizeof(dummy_csum);
		if (offset < sbi->s_desc_size)
			csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp + offset,
					     sbi->s_desc_size - offset);
2054 2055 2056

		crc = csum32 & 0xFFFF;
		goto out;
2057 2058
	}

2059
	/* old crc16 code */
2060
	if (!ext4_has_feature_gdt_csum(sb))
2061 2062
		return 0;

2063 2064 2065 2066 2067
	crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid));
	crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group));
	crc = crc16(crc, (__u8 *)gdp, offset);
	offset += sizeof(gdp->bg_checksum); /* skip checksum */
	/* for checksum of struct ext4_group_desc do the rest...*/
2068
	if (ext4_has_feature_64bit(sb) &&
2069 2070 2071 2072 2073 2074
	    offset < le16_to_cpu(sbi->s_es->s_desc_size))
		crc = crc16(crc, (__u8 *)gdp + offset,
			    le16_to_cpu(sbi->s_es->s_desc_size) -
				offset);

out:
2075 2076 2077
	return cpu_to_le16(crc);
}

2078
int ext4_group_desc_csum_verify(struct super_block *sb, __u32 block_group,
2079 2080
				struct ext4_group_desc *gdp)
{
2081
	if (ext4_has_group_desc_csum(sb) &&
2082
	    (gdp->bg_checksum != ext4_group_desc_csum(sb, block_group, gdp)))
2083 2084 2085 2086 2087
		return 0;

	return 1;
}

2088 2089 2090 2091 2092
void ext4_group_desc_csum_set(struct super_block *sb, __u32 block_group,
			      struct ext4_group_desc *gdp)
{
	if (!ext4_has_group_desc_csum(sb))
		return;
2093
	gdp->bg_checksum = ext4_group_desc_csum(sb, block_group, gdp);
2094 2095
}

2096
/* Called at mount-time, super-block is locked */
2097
static int ext4_check_descriptors(struct super_block *sb,
2098
				  ext4_fsblk_t sb_block,
2099
				  ext4_group_t *first_not_zeroed)
2100
{
2101 2102 2103
	struct ext4_sb_info *sbi = EXT4_SB(sb);
	ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block);
	ext4_fsblk_t last_block;
2104 2105 2106
	ext4_fsblk_t block_bitmap;
	ext4_fsblk_t inode_bitmap;
	ext4_fsblk_t inode_table;
2107
	int flexbg_flag = 0;
2108
	ext4_group_t i, grp = sbi->s_groups_count;
2109

2110
	if (ext4_has_feature_flex_bg(sb))
2111 2112
		flexbg_flag = 1;

2113
	ext4_debug("Checking group descriptors");
2114

2115 2116 2117
	for (i = 0; i < sbi->s_groups_count; i++) {
		struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL);

2118
		if (i == sbi->s_groups_count - 1 || flexbg_flag)
2119
			last_block = ext4_blocks_count(sbi->s_es) - 1;
2120 2121
		else
			last_block = first_block +
2122
				(EXT4_BLOCKS_PER_GROUP(sb) - 1);
2123

2124 2125 2126 2127
		if ((grp == sbi->s_groups_count) &&
		   !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
			grp = i;

2128
		block_bitmap = ext4_block_bitmap(sb, gdp);
2129 2130 2131 2132 2133
		if (block_bitmap == sb_block) {
			ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
				 "Block bitmap for group %u overlaps "
				 "superblock", i);
		}
2134
		if (block_bitmap < first_block || block_bitmap > last_block) {
2135
			ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2136
			       "Block bitmap for group %u not in group "
2137
			       "(block %llu)!", i, block_bitmap);
2138 2139
			return 0;
		}
2140
		inode_bitmap = ext4_inode_bitmap(sb, gdp);
2141 2142 2143 2144 2145
		if (inode_bitmap == sb_block) {
			ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
				 "Inode bitmap for group %u overlaps "
				 "superblock", i);
		}
2146
		if (inode_bitmap < first_block || inode_bitmap > last_block) {
2147
			ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2148
			       "Inode bitmap for group %u not in group "
2149
			       "(block %llu)!", i, inode_bitmap);
2150 2151
			return 0;
		}
2152
		inode_table = ext4_inode_table(sb, gdp);
2153 2154 2155 2156 2157
		if (inode_table == sb_block) {
			ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
				 "Inode table for group %u overlaps "
				 "superblock", i);
		}
2158
		if (inode_table < first_block ||
2159
		    inode_table + sbi->s_itb_per_group - 1 > last_block) {
2160
			ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
2161
			       "Inode table for group %u not in group "
2162
			       "(block %llu)!", i, inode_table);
2163 2164
			return 0;
		}
2165
		ext4_lock_group(sb, i);
2166
		if (!ext4_group_desc_csum_verify(sb, i, gdp)) {
2167 2168
			ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: "
				 "Checksum for group %u failed (%u!=%u)",
2169
				 i, le16_to_cpu(ext4_group_desc_csum(sb, i,
2170
				     gdp)), le16_to_cpu(gdp->bg_checksum));
2171
			if (!(sb->s_flags & MS_RDONLY)) {
2172
				ext4_unlock_group(sb, i);
2173
				return 0;
2174
			}
2175
		}
2176
		ext4_unlock_group(sb, i);
2177 2178
		if (!flexbg_flag)
			first_block += EXT4_BLOCKS_PER_GROUP(sb);
2179
	}
2180 2181
	if (NULL != first_not_zeroed)
		*first_not_zeroed = grp;
2182 2183 2184
	return 1;
}

2185
/* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at
2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196 2197
 * the superblock) which were deleted from all directories, but held open by
 * a process at the time of a crash.  We walk the list and try to delete these
 * inodes at recovery time (only with a read-write filesystem).
 *
 * In order to keep the orphan inode chain consistent during traversal (in
 * case of crash during recovery), we link each inode into the superblock
 * orphan list_head and handle it the same way as an inode deletion during
 * normal operation (which journals the operations for us).
 *
 * We only do an iget() and an iput() on each inode, which is very safe if we
 * accidentally point at an in-use or already deleted inode.  The worst that
 * can happen in this case is that we get a "bit already cleared" message from
2198
 * ext4_free_inode().  The only reason we would point at a wrong inode is if
2199 2200 2201
 * e2fsck was run on this filesystem, and it must have already done the orphan
 * inode cleanup for us, so we can safely abort without any further action.
 */
2202 2203
static void ext4_orphan_cleanup(struct super_block *sb,
				struct ext4_super_block *es)
2204 2205 2206 2207
{
	unsigned int s_flags = sb->s_flags;
	int nr_orphans = 0, nr_truncates = 0;
#ifdef CONFIG_QUOTA
2208
	int quota_update = 0;
2209 2210 2211 2212 2213 2214 2215
	int i;
#endif
	if (!es->s_last_orphan) {
		jbd_debug(4, "no orphan inodes to clean up\n");
		return;
	}

2216
	if (bdev_read_only(sb->s_bdev)) {
2217 2218
		ext4_msg(sb, KERN_ERR, "write access "
			"unavailable, skipping orphan cleanup");
2219 2220 2221
		return;
	}

2222 2223 2224 2225 2226 2227 2228
	/* Check if feature set would not allow a r/w mount */
	if (!ext4_feature_set_ok(sb, 0)) {
		ext4_msg(sb, KERN_INFO, "Skipping orphan cleanup due to "
			 "unknown ROCOMPAT features");
		return;
	}

2229
	if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
2230 2231
		/* don't clear list on RO mount w/ errors */
		if (es->s_last_orphan && !(s_flags & MS_RDONLY)) {
2232
			ext4_msg(sb, KERN_INFO, "Errors on filesystem, "
2233
				  "clearing orphan list.\n");
2234 2235
			es->s_last_orphan = 0;
		}
2236 2237 2238 2239 2240
		jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
		return;
	}

	if (s_flags & MS_RDONLY) {
2241
		ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs");
2242 2243 2244 2245 2246
		sb->s_flags &= ~MS_RDONLY;
	}
#ifdef CONFIG_QUOTA
	/* Needed for iput() to work correctly and not trash data */
	sb->s_flags |= MS_ACTIVE;
2247 2248 2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262

	/*
	 * Turn on quotas which were not enabled for read-only mounts if
	 * filesystem has quota feature, so that they are updated correctly.
	 */
	if (ext4_has_feature_quota(sb) && (s_flags & MS_RDONLY)) {
		int ret = ext4_enable_quotas(sb);

		if (!ret)
			quota_update = 1;
		else
			ext4_msg(sb, KERN_ERR,
				"Cannot turn on quotas: error %d", ret);
	}

	/* Turn on journaled quotas used for old sytle */
Jan Kara's avatar
Jan Kara committed
2263
	for (i = 0; i < EXT4_MAXQUOTAS; i++) {
2264 2265
		if (EXT4_SB(sb)->s_qf_names[i]) {
			int ret = ext4_quota_on_mount(sb, i);
2266 2267 2268 2269

			if (!ret)
				quota_update = 1;
			else
2270 2271
				ext4_msg(sb, KERN_ERR,
					"Cannot turn on journaled "
2272
					"quota: type %d: error %d", i, ret);
2273 2274 2275 2276 2277 2278 2279
		}
	}
#endif

	while (es->s_last_orphan) {
		struct inode *inode;

2280 2281 2282 2283 2284 2285 2286 2287 2288 2289
		/*
		 * We may have encountered an error during cleanup; if
		 * so, skip the rest.
		 */
		if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) {
			jbd_debug(1, "Skipping orphan recovery on fs with errors.\n");
			es->s_last_orphan = 0;
			break;
		}

2290 2291
		inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan));
		if (IS_ERR(inode)) {
2292 2293 2294 2295
			es->s_last_orphan = 0;
			break;
		}

2296
		list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan);
2297
		dquot_initialize(inode);
2298
		if (inode->i_nlink) {
2299 2300 2301 2302
			if (test_opt(sb, DEBUG))
				ext4_msg(sb, KERN_DEBUG,
					"%s: truncating inode %lu to %lld bytes",
					__func__, inode->i_ino, inode->i_size);
2303
			jbd_debug(2, "truncating inode %lu to %lld bytes\n",
2304
				  inode->i_ino, inode->i_size);
2305
			mutex_lock(&inode->i_mutex);
2306
			truncate_inode_pages(inode->i_mapping, inode->i_size);
2307
			ext4_truncate(inode);
2308
			mutex_unlock(&inode->i_mutex);
2309 2310
			nr_truncates++;
		} else {
2311 2312 2313 2314
			if (test_opt(sb, DEBUG))
				ext4_msg(sb, KERN_DEBUG,
					"%s: deleting unreferenced inode %lu",
					__func__, inode->i_ino);
2315 2316 2317 2318 2319 2320 2321
			jbd_debug(2, "deleting unreferenced inode %lu\n",
				  inode->i_ino);
			nr_orphans++;
		}
		iput(inode);  /* The delete magic happens here! */
	}

2322
#define PLURAL(x) (x), ((x) == 1) ? "" : "s"
2323 2324

	if (nr_orphans)
2325 2326
		ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted",
		       PLURAL(nr_orphans));
2327
	if (nr_truncates)
2328 2329
		ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up",
		       PLURAL(nr_truncates));
2330
#ifdef CONFIG_QUOTA
2331 2332 2333 2334 2335 2336
	/* Turn off quotas if they were enabled for orphan cleanup */
	if (quota_update) {
		for (i = 0; i < EXT4_MAXQUOTAS; i++) {
			if (sb_dqopt(sb)->files[i])
				dquot_quota_off(sb, i);
		}
2337 2338 2339 2340
	}
#endif
	sb->s_flags = s_flags; /* Restore MS_RDONLY status */
}
2341

2342 2343 2344 2345 2346 2347 2348
/*
 * Maximal extent format file size.
 * Resulting logical blkno at s_maxbytes must fit in our on-disk
 * extent format containers, within a sector_t, and within i_blocks
 * in the vfs.  ext4 inode has 48 bits of i_block in fsblock units,
 * so that won't be a limiting factor.
 *
2349 2350 2351 2352 2353 2354
 * However there is other limiting factor. We do store extents in the form
 * of starting block and length, hence the resulting length of the extent
 * covering maximum file size must fit into on-disk format containers as
 * well. Given that length is always by 1 unit bigger than max unit (because
 * we count 0 as well) we have to lower the s_maxbytes by one fs block.
 *
2355 2356
 * Note, this does *not* consider any metadata overhead for vfs i_blocks.
 */
2357
static loff_t ext4_max_size(int blkbits, int has_huge_files)
2358 2359 2360 2361 2362
{
	loff_t res;
	loff_t upper_limit = MAX_LFS_FILESIZE;

	/* small i_blocks in vfs inode? */
2363
	if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
2364
		/*
2365
		 * CONFIG_LBDAF is not enabled implies the inode
2366 2367 2368 2369 2370 2371 2372 2373 2374 2375
		 * i_block represent total blocks in 512 bytes
		 * 32 == size of vfs inode i_blocks * 8
		 */
		upper_limit = (1LL << 32) - 1;

		/* total blocks in file system block size */
		upper_limit >>= (blkbits - 9);
		upper_limit <<= blkbits;
	}

2376 2377 2378 2379 2380 2381
	/*
	 * 32-bit extent-start container, ee_block. We lower the maxbytes
	 * by one fs block, so ee_len can cover the extent of maximum file
	 * size
	 */
	res = (1LL << 32) - 1;
2382 2383 2384 2385 2386 2387 2388 2389
	res <<= blkbits;

	/* Sanity check against vm- & vfs- imposed limits */
	if (res > upper_limit)
		res = upper_limit;

	return res;
}
2390 2391

/*
2392
 * Maximal bitmap file size.  There is a direct, and {,double-,triple-}indirect
2393 2394
 * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks.
 * We need to be 1 filesystem block less than the 2^48 sector limit.
2395
 */
2396
static loff_t ext4_max_bitmap_size(int bits, int has_huge_files)
2397
{
2398
	loff_t res = EXT4_NDIR_BLOCKS;
2399 2400
	int meta_blocks;
	loff_t upper_limit;
2401 2402 2403 2404 2405 2406
	/* This is calculated to be the largest file size for a dense, block
	 * mapped file such that the file's total number of 512-byte sectors,
	 * including data and all indirect blocks, does not exceed (2^48 - 1).
	 *
	 * __u32 i_blocks_lo and _u16 i_blocks_high represent the total
	 * number of 512-byte sectors of the file.
2407 2408
	 */

2409
	if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) {
2410
		/*
2411
		 * !has_huge_files or CONFIG_LBDAF not enabled implies that
2412 2413
		 * the inode i_block field represents total file blocks in
		 * 2^32 512-byte sectors == size of vfs inode i_blocks * 8
2414 2415 2416 2417 2418 2419 2420
		 */
		upper_limit = (1LL << 32) - 1;

		/* total blocks in file system block size */
		upper_limit >>= (bits - 9);

	} else {
Aneesh Kumar K.V's avatar
Aneesh Kumar K.V committed
2421 2422 2423 2424 2425 2426
		/*
		 * We use 48 bit ext4_inode i_blocks
		 * With EXT4_HUGE_FILE_FL set the i_blocks
		 * represent total number of blocks in
		 * file system block size
		 */
2427 2428 2429 2430 2431 2432 2433 2434 2435 2436 2437 2438 2439
		upper_limit = (1LL << 48) - 1;

	}

	/* indirect blocks */
	meta_blocks = 1;
	/* double indirect blocks */
	meta_blocks += 1 + (1LL << (bits-2));
	/* tripple indirect blocks */
	meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2)));

	upper_limit -= meta_blocks;
	upper_limit <<= bits;
2440 2441 2442 2443 2444 2445 2446

	res += 1LL << (bits-2);
	res += 1LL << (2*(bits-2));
	res += 1LL << (3*(bits-2));
	res <<= bits;
	if (res > upper_limit)
		res = upper_limit;
2447 2448 2449 2450

	if (res > MAX_LFS_FILESIZE)
		res = MAX_LFS_FILESIZE;

2451 2452 2453
	return res;
}

2454
static ext4_fsblk_t descriptor_loc(struct super_block *sb,
2455
				   ext4_fsblk_t logical_sb_block, int nr)
2456
{
2457
	struct ext4_sb_info *sbi = EXT4_SB(sb);
2458
	ext4_group_t bg, first_meta_bg;
2459 2460 2461 2462
	int has_super = 0;

	first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg);

2463
	if (!ext4_has_feature_meta_bg(sb) || nr < first_meta_bg)
2464
		return logical_sb_block + nr + 1;
2465
	bg = sbi->s_desc_per_block * nr;
2466
	if (ext4_bg_has_super(sb, bg))
2467
		has_super = 1;
2468

2469 2470 2471 2472 2473 2474 2475 2476 2477 2478
	/*
	 * If we have a meta_bg fs with 1k blocks, group 0's GDT is at
	 * block 2, not 1.  If s_first_data_block == 0 (bigalloc is enabled
	 * on modern mke2fs or blksize > 1k on older mke2fs) then we must
	 * compensate.
	 */
	if (sb->s_blocksize == 1024 && nr == 0 &&
	    le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block) == 0)
		has_super++;

2479
	return (has_super + ext4_group_first_block_no(sb, bg));
2480 2481
}

2482 2483 2484 2485 2486 2487 2488 2489 2490 2491 2492 2493 2494 2495 2496 2497
/**
 * ext4_get_stripe_size: Get the stripe size.
 * @sbi: In memory super block info
 *
 * If we have specified it via mount option, then
 * use the mount option value. If the value specified at mount time is
 * greater than the blocks per group use the super block value.
 * If the super block value is greater than blocks per group return 0.
 * Allocator needs it be less than blocks per group.
 *
 */
static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
{
	unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride);
	unsigned long stripe_width =
			le32_to_cpu(sbi->s_es->s_raid_stripe_width);
2498
	int ret;
2499 2500

	if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group)
2501
		ret = sbi->s_stripe;
2502
	else if (stripe_width && stripe_width <= sbi->s_blocks_per_group)
2503
		ret = stripe_width;
2504
	else if (stride && stride <= sbi->s_blocks_per_group)
2505 2506 2507
		ret = stride;
	else
		ret = 0;
2508

2509 2510 2511 2512 2513 2514
	/*
	 * If the stripe width is 1, this makes no sense and
	 * we set it to 0 to turn off stripe handling code.
	 */
	if (ret <= 1)
		ret = 0;
2515

2516
	return ret;
2517
}
2518

2519 2520 2521 2522 2523 2524 2525 2526
/*
 * Check whether this filesystem can be mounted based on
 * the features present and the RDONLY/RDWR mount requested.
 * Returns 1 if this filesystem can be mounted as requested,
 * 0 if it cannot be.
 */
static int ext4_feature_set_ok(struct super_block *sb, int readonly)
{
2527
	if (ext4_has_unknown_ext4_incompat_features(sb)) {
2528 2529 2530 2531 2532 2533 2534 2535 2536 2537 2538
		ext4_msg(sb, KERN_ERR,
			"Couldn't mount because of "
			"unsupported optional features (%x)",
			(le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
			~EXT4_FEATURE_INCOMPAT_SUPP));
		return 0;
	}

	if (readonly)
		return 1;

2539
	if (ext4_has_feature_readonly(sb)) {
2540 2541 2542 2543 2544
		ext4_msg(sb, KERN_INFO, "filesystem is read-only");
		sb->s_flags |= MS_RDONLY;
		return 1;
	}

2545
	/* Check that feature set is OK for a read-write mount */
2546
	if (ext4_has_unknown_ext4_ro_compat_features(sb)) {
2547 2548 2549 2550 2551 2552 2553 2554 2555 2556
		ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of "
			 "unsupported optional features (%x)",
			 (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
				~EXT4_FEATURE_RO_COMPAT_SUPP));
		return 0;
	}
	/*
	 * Large file size enabled file system can only be mounted
	 * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF
	 */
2557
	if (ext4_has_feature_huge_file(sb)) {
2558 2559 2560 2561 2562 2563 2564
		if (sizeof(blkcnt_t) < sizeof(u64)) {
			ext4_msg(sb, KERN_ERR, "Filesystem with huge files "
				 "cannot be mounted RDWR without "
				 "CONFIG_LBDAF");
			return 0;
		}
	}
2565
	if (ext4_has_feature_bigalloc(sb) && !ext4_has_feature_extents(sb)) {
2566 2567 2568 2569 2570
		ext4_msg(sb, KERN_ERR,
			 "Can't support bigalloc feature without "
			 "extents feature\n");
		return 0;
	}
2571 2572

#ifndef CONFIG_QUOTA
2573
	if (ext4_has_feature_quota(sb) && !readonly) {
2574 2575 2576 2577 2578 2579
		ext4_msg(sb, KERN_ERR,
			 "Filesystem with quota feature cannot be mounted RDWR "
			 "without CONFIG_QUOTA");
		return 0;
	}
#endif  /* CONFIG_QUOTA */
2580 2581 2582
	return 1;
}

2583 2584 2585 2586 2587 2588 2589 2590 2591 2592 2593 2594 2595 2596
/*
 * This function is called once a day if we have errors logged
 * on the file system
 */
static void print_daily_error_info(unsigned long arg)
{
	struct super_block *sb = (struct super_block *) arg;
	struct ext4_sb_info *sbi;
	struct ext4_super_block *es;

	sbi = EXT4_SB(sb);
	es = sbi->s_es;

	if (es->s_error_count)
2597 2598
		/* fsck newer than v1.41.13 is needed to clean this condition. */
		ext4_msg(sb, KERN_NOTICE, "error count since last fsck: %u",
2599 2600
			 le32_to_cpu(es->s_error_count));
	if (es->s_first_error_time) {
2601
		printk(KERN_NOTICE "EXT4-fs (%s): initial error at time %u: %.*s:%d",
2602 2603 2604 2605 2606 2607 2608 2609 2610 2611 2612 2613 2614
		       sb->s_id, le32_to_cpu(es->s_first_error_time),
		       (int) sizeof(es->s_first_error_func),
		       es->s_first_error_func,
		       le32_to_cpu(es->s_first_error_line));
		if (es->s_first_error_ino)
			printk(": inode %u",
			       le32_to_cpu(es->s_first_error_ino));
		if (es->s_first_error_block)
			printk(": block %llu", (unsigned long long)
			       le64_to_cpu(es->s_first_error_block));
		printk("\n");
	}
	if (es->s_last_error_time) {
2615
		printk(KERN_NOTICE "EXT4-fs (%s): last error at time %u: %.*s:%d",
2616 2617 2618 2619 2620 2621 2622 2623 2624 2625 2626 2627 2628 2629 2630
		       sb->s_id, le32_to_cpu(es->s_last_error_time),
		       (int) sizeof(es->s_last_error_func),
		       es->s_last_error_func,
		       le32_to_cpu(es->s_last_error_line));
		if (es->s_last_error_ino)
			printk(": inode %u",
			       le32_to_cpu(es->s_last_error_ino));
		if (es->s_last_error_block)
			printk(": block %llu", (unsigned long long)
			       le64_to_cpu(es->s_last_error_block));
		printk("\n");
	}
	mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ);  /* Once a day */
}

2631 2632 2633 2634 2635 2636 2637 2638 2639 2640 2641 2642
/* Find next suitable group and run ext4_init_inode_table */
static int ext4_run_li_request(struct ext4_li_request *elr)
{
	struct ext4_group_desc *gdp = NULL;
	ext4_group_t group, ngroups;
	struct super_block *sb;
	unsigned long timeout = 0;
	int ret = 0;

	sb = elr->lr_super;
	ngroups = EXT4_SB(sb)->s_groups_count;

2643
	sb_start_write(sb);
2644 2645 2646 2647 2648 2649 2650 2651 2652 2653 2654
	for (group = elr->lr_next_group; group < ngroups; group++) {
		gdp = ext4_get_group_desc(sb, group, NULL);
		if (!gdp) {
			ret = 1;
			break;
		}

		if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
			break;
	}

2655
	if (group >= ngroups)
2656 2657 2658 2659 2660 2661 2662
		ret = 1;

	if (!ret) {
		timeout = jiffies;
		ret = ext4_init_inode_table(sb, group,
					    elr->lr_timeout ? 0 : 1);
		if (elr->lr_timeout == 0) {
2663 2664
			timeout = (jiffies - timeout) *
				  elr->lr_sbi->s_li_wait_mult;
2665 2666 2667 2668 2669
			elr->lr_timeout = timeout;
		}
		elr->lr_next_sched = jiffies + elr->lr_timeout;
		elr->lr_next_group = group + 1;
	}
2670
	sb_end_write(sb);
2671 2672 2673 2674 2675 2676

	return ret;
}

/*
 * Remove lr_request from the list_request and free the
2677
 * request structure. Should be called with li_list_mtx held
2678 2679 2680 2681 2682 2683 2684 2685 2686 2687 2688 2689 2690 2691 2692 2693 2694
 */
static void ext4_remove_li_request(struct ext4_li_request *elr)
{
	struct ext4_sb_info *sbi;

	if (!elr)
		return;

	sbi = elr->lr_sbi;

	list_del(&elr->lr_request);
	sbi->s_li_request = NULL;
	kfree(elr);
}

static void ext4_unregister_li_request(struct super_block *sb)
{
2695 2696 2697
	mutex_lock(&ext4_li_mtx);
	if (!ext4_li_info) {
		mutex_unlock(&ext4_li_mtx);
2698
		return;
2699
	}
2700 2701

	mutex_lock(&ext4_li_info->li_list_mtx);
2702
	ext4_remove_li_request(EXT4_SB(sb)->s_li_request);
2703
	mutex_unlock(&ext4_li_info->li_list_mtx);
2704
	mutex_unlock(&ext4_li_mtx);
2705 2706
}

2707 2708
static struct task_struct *ext4_lazyinit_task;

2709 2710 2711 2712 2713 2714 2715 2716 2717 2718 2719 2720 2721 2722
/*
 * This is the function where ext4lazyinit thread lives. It walks
 * through the request list searching for next scheduled filesystem.
 * When such a fs is found, run the lazy initialization request
 * (ext4_rn_li_request) and keep track of the time spend in this
 * function. Based on that time we compute next schedule time of
 * the request. When walking through the list is complete, compute
 * next waking time and put itself into sleep.
 */
static int ext4_lazyinit_thread(void *arg)
{
	struct ext4_lazy_init *eli = (struct ext4_lazy_init *)arg;
	struct list_head *pos, *n;
	struct ext4_li_request *elr;
2723
	unsigned long next_wakeup, cur;
2724 2725 2726 2727 2728 2729 2730 2731 2732 2733 2734 2735 2736 2737 2738 2739 2740

	BUG_ON(NULL == eli);

cont_thread:
	while (true) {
		next_wakeup = MAX_JIFFY_OFFSET;

		mutex_lock(&eli->li_list_mtx);
		if (list_empty(&eli->li_request_list)) {
			mutex_unlock(&eli->li_list_mtx);
			goto exit_thread;
		}

		list_for_each_safe(pos, n, &eli->li_request_list) {
			elr = list_entry(pos, struct ext4_li_request,
					 lr_request);

2741 2742 2743 2744 2745 2746
			if (time_after_eq(jiffies, elr->lr_next_sched)) {
				if (ext4_run_li_request(elr) != 0) {
					/* error, remove the lazy_init job */
					ext4_remove_li_request(elr);
					continue;
				}
2747 2748 2749 2750 2751 2752 2753
			}

			if (time_before(elr->lr_next_sched, next_wakeup))
				next_wakeup = elr->lr_next_sched;
		}
		mutex_unlock(&eli->li_list_mtx);

2754
		try_to_freeze();
2755

2756 2757
		cur = jiffies;
		if ((time_after_eq(cur, next_wakeup)) ||
2758
		    (MAX_JIFFY_OFFSET == next_wakeup)) {
2759 2760 2761 2762
			cond_resched();
			continue;
		}

2763 2764
		schedule_timeout_interruptible(next_wakeup - cur);

2765 2766 2767 2768
		if (kthread_should_stop()) {
			ext4_clear_request_list();
			goto exit_thread;
		}
2769 2770 2771 2772 2773 2774 2775 2776 2777 2778 2779 2780 2781 2782 2783 2784 2785 2786 2787 2788 2789 2790 2791 2792 2793 2794 2795 2796 2797 2798 2799 2800 2801 2802 2803 2804 2805 2806 2807 2808 2809 2810
	}

exit_thread:
	/*
	 * It looks like the request list is empty, but we need
	 * to check it under the li_list_mtx lock, to prevent any
	 * additions into it, and of course we should lock ext4_li_mtx
	 * to atomically free the list and ext4_li_info, because at
	 * this point another ext4 filesystem could be registering
	 * new one.
	 */
	mutex_lock(&ext4_li_mtx);
	mutex_lock(&eli->li_list_mtx);
	if (!list_empty(&eli->li_request_list)) {
		mutex_unlock(&eli->li_list_mtx);
		mutex_unlock(&ext4_li_mtx);
		goto cont_thread;
	}
	mutex_unlock(&eli->li_list_mtx);
	kfree(ext4_li_info);
	ext4_li_info = NULL;
	mutex_unlock(&ext4_li_mtx);

	return 0;
}

static void ext4_clear_request_list(void)
{
	struct list_head *pos, *n;
	struct ext4_li_request *elr;

	mutex_lock(&ext4_li_info->li_list_mtx);
	list_for_each_safe(pos, n, &ext4_li_info->li_request_list) {
		elr = list_entry(pos, struct ext4_li_request,
				 lr_request);
		ext4_remove_li_request(elr);
	}
	mutex_unlock(&ext4_li_info->li_list_mtx);
}

static int ext4_run_lazyinit_thread(void)
{
2811 2812 2813 2814
	ext4_lazyinit_task = kthread_run(ext4_lazyinit_thread,
					 ext4_li_info, "ext4lazyinit");
	if (IS_ERR(ext4_lazyinit_task)) {
		int err = PTR_ERR(ext4_lazyinit_task);
2815 2816 2817
		ext4_clear_request_list();
		kfree(ext4_li_info);
		ext4_li_info = NULL;
2818
		printk(KERN_CRIT "EXT4-fs: error %d creating inode table "
2819 2820 2821 2822 2823 2824 2825 2826 2827 2828 2829 2830 2831 2832 2833 2834 2835 2836 2837 2838 2839 2840 2841 2842 2843 2844 2845 2846 2847 2848 2849 2850 2851 2852 2853 2854 2855 2856 2857 2858 2859 2860 2861 2862 2863 2864 2865 2866 2867 2868 2869 2870 2871 2872 2873 2874 2875 2876 2877 2878 2879 2880 2881 2882 2883 2884 2885 2886
				 "initialization thread\n",
				 err);
		return err;
	}
	ext4_li_info->li_state |= EXT4_LAZYINIT_RUNNING;
	return 0;
}

/*
 * Check whether it make sense to run itable init. thread or not.
 * If there is at least one uninitialized inode table, return
 * corresponding group number, else the loop goes through all
 * groups and return total number of groups.
 */
static ext4_group_t ext4_has_uninit_itable(struct super_block *sb)
{
	ext4_group_t group, ngroups = EXT4_SB(sb)->s_groups_count;
	struct ext4_group_desc *gdp = NULL;

	for (group = 0; group < ngroups; group++) {
		gdp = ext4_get_group_desc(sb, group, NULL);
		if (!gdp)
			continue;

		if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED)))
			break;
	}

	return group;
}

static int ext4_li_info_new(void)
{
	struct ext4_lazy_init *eli = NULL;

	eli = kzalloc(sizeof(*eli), GFP_KERNEL);
	if (!eli)
		return -ENOMEM;

	INIT_LIST_HEAD(&eli->li_request_list);
	mutex_init(&eli->li_list_mtx);

	eli->li_state |= EXT4_LAZYINIT_QUIT;

	ext4_li_info = eli;

	return 0;
}

static struct ext4_li_request *ext4_li_request_new(struct super_block *sb,
					    ext4_group_t start)
{
	struct ext4_sb_info *sbi = EXT4_SB(sb);
	struct ext4_li_request *elr;

	elr = kzalloc(sizeof(*elr), GFP_KERNEL);
	if (!elr)
		return NULL;

	elr->lr_super = sb;
	elr->lr_sbi = sbi;
	elr->lr_next_group = start;

	/*
	 * Randomize first schedule time of the request to
	 * spread the inode table initialization requests
	 * better.
	 */
2887 2888
	elr->lr_next_sched = jiffies + (prandom_u32() %
				(EXT4_DEF_LI_MAX_START_DELAY * HZ));
2889 2890 2891
	return elr;
}

2892 2893
int ext4_register_li_request(struct super_block *sb,
			     ext4_group_t first_not_zeroed)
2894 2895
{
	struct ext4_sb_info *sbi = EXT4_SB(sb);
2896
	struct ext4_li_request *elr = NULL;
2897
	ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
2898
	int ret = 0;
2899

2900
	mutex_lock(&ext4_li_mtx);
2901 2902 2903 2904 2905 2906
	if (sbi->s_li_request != NULL) {
		/*
		 * Reset timeout so it can be computed again, because
		 * s_li_wait_mult might have changed.
		 */
		sbi->s_li_request->lr_timeout = 0;
2907
		goto out;
2908
	}
2909 2910 2911

	if (first_not_zeroed == ngroups ||
	    (sb->s_flags & MS_RDONLY) ||
2912
	    !test_opt(sb, INIT_INODE_TABLE))
2913
		goto out;
2914 2915

	elr = ext4_li_request_new(sb, first_not_zeroed);
2916 2917 2918 2919
	if (!elr) {
		ret = -ENOMEM;
		goto out;
	}
2920 2921 2922 2923 2924 2925 2926 2927 2928 2929 2930 2931

	if (NULL == ext4_li_info) {
		ret = ext4_li_info_new();
		if (ret)
			goto out;
	}

	mutex_lock(&ext4_li_info->li_list_mtx);
	list_add(&elr->lr_request, &ext4_li_info->li_request_list);
	mutex_unlock(&ext4_li_info->li_list_mtx);

	sbi->s_li_request = elr;
2932 2933 2934 2935 2936 2937
	/*
	 * set elr to NULL here since it has been inserted to
	 * the request_list and the removal and free of it is
	 * handled by ext4_clear_request_list from now on.
	 */
	elr = NULL;
2938 2939 2940 2941 2942 2943 2944

	if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) {
		ret = ext4_run_lazyinit_thread();
		if (ret)
			goto out;
	}
out:
2945 2946
	mutex_unlock(&ext4_li_mtx);
	if (ret)
2947 2948 2949 2950 2951 2952 2953 2954 2955 2956 2957 2958 2959 2960
		kfree(elr);
	return ret;
}

/*
 * We do not need to lock anything since this is called on
 * module unload.
 */
static void ext4_destroy_lazyinit_thread(void)
{
	/*
	 * If thread exited earlier
	 * there's nothing to be done.
	 */
2961
	if (!ext4_li_info || !ext4_lazyinit_task)
2962 2963
		return;

2964
	kthread_stop(ext4_lazyinit_task);
2965 2966
}

2967 2968 2969 2970 2971 2972
static int set_journal_csum_feature_set(struct super_block *sb)
{
	int ret = 1;
	int compat, incompat;
	struct ext4_sb_info *sbi = EXT4_SB(sb);

2973
	if (ext4_has_metadata_csum(sb)) {
2974
		/* journal checksum v3 */
2975
		compat = 0;
2976
		incompat = JBD2_FEATURE_INCOMPAT_CSUM_V3;
2977 2978 2979 2980 2981 2982
	} else {
		/* journal checksum v1 */
		compat = JBD2_FEATURE_COMPAT_CHECKSUM;
		incompat = 0;
	}

2983 2984 2985 2986
	jbd2_journal_clear_features(sbi->s_journal,
			JBD2_FEATURE_COMPAT_CHECKSUM, 0,
			JBD2_FEATURE_INCOMPAT_CSUM_V3 |
			JBD2_FEATURE_INCOMPAT_CSUM_V2);
2987 2988 2989 2990 2991 2992 2993 2994 2995 2996 2997 2998
	if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
		ret = jbd2_journal_set_features(sbi->s_journal,
				compat, 0,
				JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT |
				incompat);
	} else if (test_opt(sb, JOURNAL_CHECKSUM)) {
		ret = jbd2_journal_set_features(sbi->s_journal,
				compat, 0,
				incompat);
		jbd2_journal_clear_features(sbi->s_journal, 0, 0,
				JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
	} else {
2999 3000
		jbd2_journal_clear_features(sbi->s_journal, 0, 0,
				JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT);
3001 3002 3003 3004 3005
	}

	return ret;
}

3006 3007 3008 3009 3010 3011 3012 3013 3014 3015 3016 3017 3018 3019 3020 3021 3022 3023 3024 3025 3026 3027 3028 3029
/*
 * Note: calculating the overhead so we can be compatible with
 * historical BSD practice is quite difficult in the face of
 * clusters/bigalloc.  This is because multiple metadata blocks from
 * different block group can end up in the same allocation cluster.
 * Calculating the exact overhead in the face of clustered allocation
 * requires either O(all block bitmaps) in memory or O(number of block
 * groups**2) in time.  We will still calculate the superblock for
 * older file systems --- and if we come across with a bigalloc file
 * system with zero in s_overhead_clusters the estimate will be close to
 * correct especially for very large cluster sizes --- but for newer
 * file systems, it's better to calculate this figure once at mkfs
 * time, and store it in the superblock.  If the superblock value is
 * present (even for non-bigalloc file systems), we will use it.
 */
static int count_overhead(struct super_block *sb, ext4_group_t grp,
			  char *buf)
{
	struct ext4_sb_info	*sbi = EXT4_SB(sb);
	struct ext4_group_desc	*gdp;
	ext4_fsblk_t		first_block, last_block, b;
	ext4_group_t		i, ngroups = ext4_get_groups_count(sb);
	int			s, j, count = 0;

3030
	if (!ext4_has_feature_bigalloc(sb))
3031 3032 3033
		return (ext4_bg_has_super(sb, grp) + ext4_bg_num_gdb(sb, grp) +
			sbi->s_itb_per_group + 2);

3034 3035 3036 3037 3038 3039 3040 3041 3042 3043 3044 3045 3046 3047 3048 3049 3050 3051 3052 3053 3054 3055 3056 3057 3058 3059 3060 3061 3062
	first_block = le32_to_cpu(sbi->s_es->s_first_data_block) +
		(grp * EXT4_BLOCKS_PER_GROUP(sb));
	last_block = first_block + EXT4_BLOCKS_PER_GROUP(sb) - 1;
	for (i = 0; i < ngroups; i++) {
		gdp = ext4_get_group_desc(sb, i, NULL);
		b = ext4_block_bitmap(sb, gdp);
		if (b >= first_block && b <= last_block) {
			ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
			count++;
		}
		b = ext4_inode_bitmap(sb, gdp);
		if (b >= first_block && b <= last_block) {
			ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf);
			count++;
		}
		b = ext4_inode_table(sb, gdp);
		if (b >= first_block && b + sbi->s_itb_per_group <= last_block)
			for (j = 0; j < sbi->s_itb_per_group; j++, b++) {
				int c = EXT4_B2C(sbi, b - first_block);
				ext4_set_bit(c, buf);
				count++;
			}
		if (i != grp)
			continue;
		s = 0;
		if (ext4_bg_has_super(sb, grp)) {
			ext4_set_bit(s++, buf);
			count++;
		}
3063 3064 3065 3066 3067
		j = ext4_bg_num_gdb(sb, grp);
		if (s + j > EXT4_BLOCKS_PER_GROUP(sb)) {
			ext4_error(sb, "Invalid number of block group "
				   "descriptor blocks: %d", j);
			j = EXT4_BLOCKS_PER_GROUP(sb) - s;
3068
		}
3069 3070 3071
		count += j;
		for (; j > 0; j--)
			ext4_set_bit(EXT4_B2C(sbi, s++), buf);
3072 3073 3074 3075 3076 3077 3078 3079 3080 3081 3082 3083 3084 3085 3086 3087
	}
	if (!count)
		return 0;
	return EXT4_CLUSTERS_PER_GROUP(sb) -
		ext4_count_free(buf, EXT4_CLUSTERS_PER_GROUP(sb) / 8);
}

/*
 * Compute the overhead and stash it in sbi->s_overhead
 */
int ext4_calculate_overhead(struct super_block *sb)
{
	struct ext4_sb_info *sbi = EXT4_SB(sb);
	struct ext4_super_block *es = sbi->s_es;
	ext4_group_t i, ngroups = ext4_get_groups_count(sb);
	ext4_fsblk_t overhead = 0;
3088
	char *buf = (char *) get_zeroed_page(GFP_NOFS);
3089 3090 3091 3092 3093 3094 3095 3096 3097 3098 3099 3100 3101 3102 3103 3104 3105 3106 3107 3108 3109 3110 3111 3112 3113 3114 3115

	if (!buf)
		return -ENOMEM;

	/*
	 * Compute the overhead (FS structures).  This is constant
	 * for a given filesystem unless the number of block groups
	 * changes so we cache the previous value until it does.
	 */

	/*
	 * All of the blocks before first_data_block are overhead
	 */
	overhead = EXT4_B2C(sbi, le32_to_cpu(es->s_first_data_block));

	/*
	 * Add the overhead found in each block group
	 */
	for (i = 0; i < ngroups; i++) {
		int blks;

		blks = count_overhead(sb, i, buf);
		overhead += blks;
		if (blks)
			memset(buf, 0, PAGE_SIZE);
		cond_resched();
	}
3116 3117
	/* Add the internal journal blocks as well */
	if (sbi->s_journal && !sbi->journal_bdev)
3118
		overhead += EXT4_NUM_B2C(sbi, sbi->s_journal->j_maxlen);
3119

3120 3121 3122 3123 3124 3125
	sbi->s_overhead = overhead;
	smp_wmb();
	free_page((unsigned long) buf);
	return 0;
}

3126
static void ext4_set_resv_clusters(struct super_block *sb)
3127 3128
{
	ext4_fsblk_t resv_clusters;
3129
	struct ext4_sb_info *sbi = EXT4_SB(sb);
3130

3131 3132 3133 3134 3135 3136
	/*
	 * There's no need to reserve anything when we aren't using extents.
	 * The space estimates are exact, there are no unwritten extents,
	 * hole punching doesn't need new metadata... This is needed especially
	 * to keep ext2/3 backward compatibility.
	 */
3137
	if (!ext4_has_feature_extents(sb))
3138
		return;
3139 3140 3141 3142
	/*
	 * By default we reserve 2% or 4096 clusters, whichever is smaller.
	 * This should cover the situations where we can not afford to run
	 * out of space like for example punch hole, or converting
3143
	 * unwritten extents in delalloc path. In most cases such
3144 3145 3146
	 * allocation would require 1, or 2 blocks, higher numbers are
	 * very rare.
	 */
3147 3148
	resv_clusters = (ext4_blocks_count(sbi->s_es) >>
			 sbi->s_cluster_bits);
3149 3150 3151 3152

	do_div(resv_clusters, 50);
	resv_clusters = min_t(ext4_fsblk_t, resv_clusters, 4096);

3153
	atomic64_set(&sbi->s_resv_clusters, resv_clusters);
3154 3155
}

3156
static int ext4_fill_super(struct super_block *sb, void *data, int silent)
3157
{
3158
	char *orig_data = kstrdup(data, GFP_KERNEL);
3159
	struct buffer_head *bh;
3160
	struct ext4_super_block *es = NULL;
3161
	struct ext4_sb_info *sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
3162 3163
	ext4_fsblk_t block;
	ext4_fsblk_t sb_block = get_sb_block(&data);
3164
	ext4_fsblk_t logical_sb_block;
3165 3166 3167 3168
	unsigned long offset = 0;
	unsigned long journal_devnum = 0;
	unsigned long def_mount_opts;
	struct inode *root;
3169
	const char *descr;
3170
	int ret = -ENOMEM;
3171
	int blocksize, clustersize;
3172 3173
	unsigned int db_count;
	unsigned int i;
3174
	int needs_recovery, has_huge_files, has_bigalloc;
3175
	__u64 blocks_count;
3176
	int err = 0;
3177
	unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
3178
	ext4_group_t first_not_zeroed;
3179

3180 3181
	if ((data && !orig_data) || !sbi)
		goto out_free_base;
3182 3183 3184

	sbi->s_blockgroup_lock =
		kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
3185 3186 3187
	if (!sbi->s_blockgroup_lock)
		goto out_free_base;

3188
	sb->s_fs_info = sbi;
3189
	sbi->s_sb = sb;
3190
	sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS;
3191
	sbi->s_sb_block = sb_block;
3192 3193 3194
	if (sb->s_bdev->bd_part)
		sbi->s_sectors_written_start =
			part_stat_read(sb->s_bdev->bd_part, sectors[1]);
3195

3196
	/* Cleanup superblock name */
3197
	strreplace(sb->s_id, '/', '!');
3198

3199
	/* -EINVAL is default */
3200
	ret = -EINVAL;
3201
	blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE);
3202
	if (!blocksize) {
3203
		ext4_msg(sb, KERN_ERR, "unable to set blocksize");
3204 3205 3206 3207
		goto out_fail;
	}

	/*
3208
	 * The ext4 superblock will not be buffer aligned for other than 1kB
3209 3210
	 * block sizes.  We need to calculate the offset from buffer start.
	 */
3211
	if (blocksize != EXT4_MIN_BLOCK_SIZE) {
3212 3213
		logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
		offset = do_div(logical_sb_block, blocksize);
3214
	} else {
3215
		logical_sb_block = sb_block;
3216 3217
	}

3218
	if (!(bh = sb_bread_unmovable(sb, logical_sb_block))) {
3219
		ext4_msg(sb, KERN_ERR, "unable to read superblock");
3220 3221 3222 3223
		goto out_fail;
	}
	/*
	 * Note: s_es must be initialized as soon as possible because
3224
	 *       some ext4 macro-instructions depend on its value
3225
	 */
3226
	es = (struct ext4_super_block *) (bh->b_data + offset);
3227 3228
	sbi->s_es = es;
	sb->s_magic = le16_to_cpu(es->s_magic);
3229 3230
	if (sb->s_magic != EXT4_SUPER_MAGIC)
		goto cantfind_ext4;
3231
	sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written);
3232

3233
	/* Warn if metadata_csum and gdt_csum are both set. */
3234 3235
	if (ext4_has_feature_metadata_csum(sb) &&
	    ext4_has_feature_gdt_csum(sb))
3236
		ext4_warning(sb, "metadata_csum and uninit_bg are "
3237 3238
			     "redundant flags; please run fsck.");

3239 3240 3241 3242 3243 3244 3245 3246
	/* Check for a known checksum algorithm */
	if (!ext4_verify_csum_type(sb, es)) {
		ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
			 "unknown checksum algorithm.");
		silent = 1;
		goto cantfind_ext4;
	}

3247
	/* Load the checksum driver */
3248
	if (ext4_has_feature_metadata_csum(sb)) {
3249 3250 3251 3252 3253 3254 3255 3256 3257
		sbi->s_chksum_driver = crypto_alloc_shash("crc32c", 0, 0);
		if (IS_ERR(sbi->s_chksum_driver)) {
			ext4_msg(sb, KERN_ERR, "Cannot load crc32c driver.");
			ret = PTR_ERR(sbi->s_chksum_driver);
			sbi->s_chksum_driver = NULL;
			goto failed_mount;
		}
	}

3258 3259 3260 3261 3262
	/* Check superblock checksum */
	if (!ext4_superblock_csum_verify(sb, es)) {
		ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with "
			 "invalid superblock checksum.  Run e2fsck?");
		silent = 1;
3263
		ret = -EFSBADCRC;
3264 3265 3266 3267
		goto cantfind_ext4;
	}

	/* Precompute checksum seed for all metadata */
3268
	if (ext4_has_feature_csum_seed(sb))
3269 3270
		sbi->s_csum_seed = le32_to_cpu(es->s_checksum_seed);
	else if (ext4_has_metadata_csum(sb))
3271 3272 3273
		sbi->s_csum_seed = ext4_chksum(sbi, ~0, es->s_uuid,
					       sizeof(es->s_uuid));

3274 3275
	/* Set defaults before we parse the mount options */
	def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
3276
	set_opt(sb, INIT_INODE_TABLE);
3277
	if (def_mount_opts & EXT4_DEFM_DEBUG)
3278
		set_opt(sb, DEBUG);
3279
	if (def_mount_opts & EXT4_DEFM_BSDGROUPS)
3280
		set_opt(sb, GRPID);
3281
	if (def_mount_opts & EXT4_DEFM_UID16)
3282
		set_opt(sb, NO_UID32);
3283 3284
	/* xattr user namespace & acls are now defaulted on */
	set_opt(sb, XATTR_USER);
Theodore Ts'o's avatar
Theodore Ts'o committed
3285
#ifdef CONFIG_EXT4_FS_POSIX_ACL
3286
	set_opt(sb, POSIX_ACL);
3287
#endif
3288 3289 3290 3291
	/* don't forget to enable journal_csum when metadata_csum is enabled. */
	if (ext4_has_metadata_csum(sb))
		set_opt(sb, JOURNAL_CHECKSUM);

3292
	if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
3293
		set_opt(sb, JOURNAL_DATA);
3294
	else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED)
3295
		set_opt(sb, ORDERED_DATA);
3296
	else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK)
3297
		set_opt(sb, WRITEBACK_DATA);
3298 3299

	if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC)
3300
		set_opt(sb, ERRORS_PANIC);
3301
	else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE)
3302
		set_opt(sb, ERRORS_CONT);
3303
	else
3304
		set_opt(sb, ERRORS_RO);
3305 3306
	/* block_validity enabled by default; disable with noblock_validity */
	set_opt(sb, BLOCK_VALIDITY);
3307
	if (def_mount_opts & EXT4_DEFM_DISCARD)
3308
		set_opt(sb, DISCARD);
3309

3310 3311
	sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid));
	sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid));
3312 3313 3314
	sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ;
	sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
	sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
3315

3316
	if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0)
3317
		set_opt(sb, BARRIER);
3318

3319 3320 3321 3322
	/*
	 * enable delayed allocation by default
	 * Use -o nodelalloc to turn it off
	 */
3323
	if (!IS_EXT3_SB(sb) && !IS_EXT2_SB(sb) &&
3324
	    ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0))
3325
		set_opt(sb, DELALLOC);
3326

3327 3328 3329 3330 3331 3332
	/*
	 * set default s_li_wait_mult for lazyinit, for the case there is
	 * no mount option specified.
	 */
	sbi->s_li_wait_mult = EXT4_DEF_LI_WAIT_MULT;

3333 3334 3335 3336 3337 3338 3339 3340 3341 3342 3343 3344 3345
	if (sbi->s_es->s_mount_opts[0]) {
		char *s_mount_opts = kstrndup(sbi->s_es->s_mount_opts,
					      sizeof(sbi->s_es->s_mount_opts),
					      GFP_KERNEL);
		if (!s_mount_opts)
			goto failed_mount;
		if (!parse_options(s_mount_opts, sb, &journal_devnum,
				   &journal_ioprio, 0)) {
			ext4_msg(sb, KERN_WARNING,
				 "failed to parse options in superblock: %s",
				 s_mount_opts);
		}
		kfree(s_mount_opts);
3346
	}
3347
	sbi->s_def_mount_opt = sbi->s_mount_opt;
3348
	if (!parse_options((char *) data, sb, &journal_devnum,
3349
			   &journal_ioprio, 0))
3350 3351
		goto failed_mount;

3352 3353 3354 3355 3356 3357 3358 3359 3360 3361 3362
	if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
		printk_once(KERN_WARNING "EXT4-fs: Warning: mounting "
			    "with data=journal disables delayed "
			    "allocation and O_DIRECT support!\n");
		if (test_opt2(sb, EXPLICIT_DELALLOC)) {
			ext4_msg(sb, KERN_ERR, "can't mount with "
				 "both data=journal and delalloc");
			goto failed_mount;
		}
		if (test_opt(sb, DIOREAD_NOLOCK)) {
			ext4_msg(sb, KERN_ERR, "can't mount with "
3363
				 "both data=journal and dioread_nolock");
3364 3365
			goto failed_mount;
		}
Ross Zwisler's avatar
Ross Zwisler committed
3366 3367 3368 3369 3370
		if (test_opt(sb, DAX)) {
			ext4_msg(sb, KERN_ERR, "can't mount with "
				 "both data=journal and dax");
			goto failed_mount;
		}
3371 3372 3373 3374 3375
		if (ext4_has_feature_encrypt(sb)) {
			ext4_msg(sb, KERN_WARNING,
				 "encrypted files will use data=ordered "
				 "instead of data journaling mode");
		}
3376 3377
		if (test_opt(sb, DELALLOC))
			clear_opt(sb, DELALLOC);
3378 3379
	} else {
		sb->s_iflags |= SB_I_CGROUPWB;
3380 3381
	}

3382
	sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
3383
		(test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
3384

3385
	if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
3386 3387 3388
	    (ext4_has_compat_features(sb) ||
	     ext4_has_ro_compat_features(sb) ||
	     ext4_has_incompat_features(sb)))
3389 3390 3391
		ext4_msg(sb, KERN_WARNING,
		       "feature flags set on rev 0 fs, "
		       "running e2fsck is recommended");
3392

3393 3394
	if (es->s_creator_os == cpu_to_le32(EXT4_OS_HURD)) {
		set_opt2(sb, HURD_COMPAT);
3395
		if (ext4_has_feature_64bit(sb)) {
3396 3397 3398 3399 3400 3401
			ext4_msg(sb, KERN_ERR,
				 "The Hurd can't support 64-bit file systems");
			goto failed_mount;
		}
	}

3402 3403 3404 3405 3406 3407 3408 3409 3410 3411 3412 3413 3414 3415 3416 3417 3418 3419 3420 3421 3422 3423
	if (IS_EXT2_SB(sb)) {
		if (ext2_feature_set_ok(sb))
			ext4_msg(sb, KERN_INFO, "mounting ext2 file system "
				 "using the ext4 subsystem");
		else {
			ext4_msg(sb, KERN_ERR, "couldn't mount as ext2 due "
				 "to feature incompatibilities");
			goto failed_mount;
		}
	}

	if (IS_EXT3_SB(sb)) {
		if (ext3_feature_set_ok(sb))
			ext4_msg(sb, KERN_INFO, "mounting ext3 file system "
				 "using the ext4 subsystem");
		else {
			ext4_msg(sb, KERN_ERR, "couldn't mount as ext3 due "
				 "to feature incompatibilities");
			goto failed_mount;
		}
	}

3424 3425 3426 3427 3428
	/*
	 * Check feature flags regardless of the revision level, since we
	 * previously didn't change the revision level when setting the flags,
	 * so there is a chance incompat flags are set on a rev 0 filesystem.
	 */
3429
	if (!ext4_feature_set_ok(sb, (sb->s_flags & MS_RDONLY)))
3430
		goto failed_mount;
3431

3432
	blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size);
3433 3434
	if (blocksize < EXT4_MIN_BLOCK_SIZE ||
	    blocksize > EXT4_MAX_BLOCK_SIZE) {
3435
		ext4_msg(sb, KERN_ERR,
3436 3437 3438 3439 3440 3441 3442 3443 3444
		       "Unsupported filesystem blocksize %d (%d log_block_size)",
			 blocksize, le32_to_cpu(es->s_log_block_size));
		goto failed_mount;
	}
	if (le32_to_cpu(es->s_log_block_size) >
	    (EXT4_MAX_BLOCK_LOG_SIZE - EXT4_MIN_BLOCK_LOG_SIZE)) {
		ext4_msg(sb, KERN_ERR,
			 "Invalid log block size: %u",
			 le32_to_cpu(es->s_log_block_size));
3445 3446 3447
		goto failed_mount;
	}

3448 3449 3450 3451 3452 3453 3454
	if (le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) > (blocksize / 4)) {
		ext4_msg(sb, KERN_ERR,
			 "Number of reserved GDT blocks insanely large: %d",
			 le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks));
		goto failed_mount;
	}

Ross Zwisler's avatar
Ross Zwisler committed
3455 3456 3457 3458 3459 3460 3461 3462 3463 3464 3465 3466 3467
	if (sbi->s_mount_opt & EXT4_MOUNT_DAX) {
		if (blocksize != PAGE_SIZE) {
			ext4_msg(sb, KERN_ERR,
					"error: unsupported blocksize for dax");
			goto failed_mount;
		}
		if (!sb->s_bdev->bd_disk->fops->direct_access) {
			ext4_msg(sb, KERN_ERR,
					"error: device does not support dax");
			goto failed_mount;
		}
	}

3468
	if (ext4_has_feature_encrypt(sb) && es->s_encryption_level) {
3469 3470 3471 3472 3473
		ext4_msg(sb, KERN_ERR, "Unsupported encryption level %d",
			 es->s_encryption_level);
		goto failed_mount;
	}

3474
	if (sb->s_blocksize != blocksize) {
3475 3476
		/* Validate the filesystem blocksize */
		if (!sb_set_blocksize(sb, blocksize)) {
3477
			ext4_msg(sb, KERN_ERR, "bad block size %d",
3478
					blocksize);
3479 3480 3481
			goto failed_mount;
		}

3482
		brelse(bh);
3483 3484
		logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE;
		offset = do_div(logical_sb_block, blocksize);
3485
		bh = sb_bread_unmovable(sb, logical_sb_block);
3486
		if (!bh) {
3487 3488
			ext4_msg(sb, KERN_ERR,
			       "Can't read superblock on 2nd try");
3489 3490
			goto failed_mount;
		}
3491
		es = (struct ext4_super_block *)(bh->b_data + offset);
3492
		sbi->s_es = es;
3493
		if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) {
3494 3495
			ext4_msg(sb, KERN_ERR,
			       "Magic mismatch, very weird!");
3496 3497 3498 3499
			goto failed_mount;
		}
	}

3500
	has_huge_files = ext4_has_feature_huge_file(sb);
3501 3502 3503
	sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits,
						      has_huge_files);
	sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files);
3504

3505 3506 3507
	if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
		sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
		sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
3508 3509 3510
	} else {
		sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
		sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
3511
		if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
Vignesh Babu's avatar
Vignesh Babu committed
3512
		    (!is_power_of_2(sbi->s_inode_size)) ||
3513
		    (sbi->s_inode_size > blocksize)) {
3514 3515
			ext4_msg(sb, KERN_ERR,
			       "unsupported inode size: %d",
3516
			       sbi->s_inode_size);
3517 3518
			goto failed_mount;
		}
3519 3520
		if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE)
			sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2);
3521
	}
3522

3523
	sbi->s_desc_size = le16_to_cpu(es->s_desc_size);
3524
	if (ext4_has_feature_64bit(sb)) {
3525
		if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
3526
		    sbi->s_desc_size > EXT4_MAX_DESC_SIZE ||
vignesh babu's avatar
vignesh babu committed
3527
		    !is_power_of_2(sbi->s_desc_size)) {
3528 3529
			ext4_msg(sb, KERN_ERR,
			       "unsupported descriptor size %lu",
3530 3531 3532 3533 3534
			       sbi->s_desc_size);
			goto failed_mount;
		}
	} else
		sbi->s_desc_size = EXT4_MIN_DESC_SIZE;
3535

3536 3537
	sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
	sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
3538

3539
	sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb);
3540
	if (sbi->s_inodes_per_block == 0)
3541
		goto cantfind_ext4;
3542 3543 3544 3545 3546 3547
	if (sbi->s_inodes_per_group < sbi->s_inodes_per_block ||
	    sbi->s_inodes_per_group > blocksize * 8) {
		ext4_msg(sb, KERN_ERR, "invalid inodes per group: %lu\n",
			 sbi->s_blocks_per_group);
		goto failed_mount;
	}
3548 3549
	sbi->s_itb_per_group = sbi->s_inodes_per_group /
					sbi->s_inodes_per_block;
3550
	sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb);
3551 3552
	sbi->s_sbh = bh;
	sbi->s_mount_state = le16_to_cpu(es->s_state);
3553 3554
	sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb));
	sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb));
3555

3556
	for (i = 0; i < 4; i++)
3557 3558
		sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]);
	sbi->s_def_hash_version = es->s_def_hash_version;
3559
	if (ext4_has_feature_dir_index(sb)) {
3560 3561 3562 3563
		i = le32_to_cpu(es->s_flags);
		if (i & EXT2_FLAGS_UNSIGNED_HASH)
			sbi->s_hash_unsigned = 3;
		else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) {
3564
#ifdef __CHAR_UNSIGNED__
3565 3566 3567 3568
			if (!(sb->s_flags & MS_RDONLY))
				es->s_flags |=
					cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH);
			sbi->s_hash_unsigned = 3;
3569
#else
3570 3571 3572
			if (!(sb->s_flags & MS_RDONLY))
				es->s_flags |=
					cpu_to_le32(EXT2_FLAGS_SIGNED_HASH);
3573
#endif
3574
		}
3575
	}
3576

3577 3578
	/* Handle clustersize */
	clustersize = BLOCK_SIZE << le32_to_cpu(es->s_log_cluster_size);
3579
	has_bigalloc = ext4_has_feature_bigalloc(sb);
3580 3581 3582 3583 3584 3585 3586
	if (has_bigalloc) {
		if (clustersize < blocksize) {
			ext4_msg(sb, KERN_ERR,
				 "cluster size (%d) smaller than "
				 "block size (%d)", clustersize, blocksize);
			goto failed_mount;
		}
3587 3588 3589 3590 3591 3592 3593
		if (le32_to_cpu(es->s_log_cluster_size) >
		    (EXT4_MAX_CLUSTER_LOG_SIZE - EXT4_MIN_BLOCK_LOG_SIZE)) {
			ext4_msg(sb, KERN_ERR,
				 "Invalid log cluster size: %u",
				 le32_to_cpu(es->s_log_cluster_size));
			goto failed_mount;
		}
3594 3595 3596 3597 3598 3599 3600 3601 3602 3603 3604 3605 3606 3607 3608 3609 3610 3611 3612 3613 3614 3615 3616 3617 3618 3619 3620 3621 3622 3623 3624 3625 3626
		sbi->s_cluster_bits = le32_to_cpu(es->s_log_cluster_size) -
			le32_to_cpu(es->s_log_block_size);
		sbi->s_clusters_per_group =
			le32_to_cpu(es->s_clusters_per_group);
		if (sbi->s_clusters_per_group > blocksize * 8) {
			ext4_msg(sb, KERN_ERR,
				 "#clusters per group too big: %lu",
				 sbi->s_clusters_per_group);
			goto failed_mount;
		}
		if (sbi->s_blocks_per_group !=
		    (sbi->s_clusters_per_group * (clustersize / blocksize))) {
			ext4_msg(sb, KERN_ERR, "blocks per group (%lu) and "
				 "clusters per group (%lu) inconsistent",
				 sbi->s_blocks_per_group,
				 sbi->s_clusters_per_group);
			goto failed_mount;
		}
	} else {
		if (clustersize != blocksize) {
			ext4_warning(sb, "fragment/cluster size (%d) != "
				     "block size (%d)", clustersize,
				     blocksize);
			clustersize = blocksize;
		}
		if (sbi->s_blocks_per_group > blocksize * 8) {
			ext4_msg(sb, KERN_ERR,
				 "#blocks per group too big: %lu",
				 sbi->s_blocks_per_group);
			goto failed_mount;
		}
		sbi->s_clusters_per_group = sbi->s_blocks_per_group;
		sbi->s_cluster_bits = 0;
3627
	}
3628 3629
	sbi->s_cluster_ratio = clustersize / blocksize;

3630 3631 3632 3633
	/* Do we have standard group size of clustersize * 8 blocks ? */
	if (sbi->s_blocks_per_group == clustersize << 3)
		set_opt2(sb, STD_GROUP_SIZE);

3634 3635 3636 3637
	/*
	 * Test whether we have more sectors than will fit in sector_t,
	 * and whether the max offset is addressable by the page cache.
	 */
3638
	err = generic_check_addressable(sb->s_blocksize_bits,
3639
					ext4_blocks_count(es));
3640
	if (err) {
3641
		ext4_msg(sb, KERN_ERR, "filesystem"
3642
			 " too large to mount safely on this system");
3643
		if (sizeof(sector_t) < 8)
3644
			ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled");
3645 3646 3647
		goto failed_mount;
	}

3648 3649
	if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
		goto cantfind_ext4;
3650

3651 3652 3653
	/* check blocks count against device size */
	blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
	if (blocks_count && ext4_blocks_count(es) > blocks_count) {
3654 3655
		ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
		       "exceeds size of device (%llu blocks)",
3656 3657 3658 3659
		       ext4_blocks_count(es), blocks_count);
		goto failed_mount;
	}

3660 3661 3662 3663 3664
	/*
	 * It makes no sense for the first data block to be beyond the end
	 * of the filesystem.
	 */
	if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) {
3665
		ext4_msg(sb, KERN_WARNING, "bad geometry: first data "
3666 3667 3668
			 "block %u is beyond end of filesystem (%llu)",
			 le32_to_cpu(es->s_first_data_block),
			 ext4_blocks_count(es));
3669 3670
		goto failed_mount;
	}
3671 3672 3673 3674
	blocks_count = (ext4_blocks_count(es) -
			le32_to_cpu(es->s_first_data_block) +
			EXT4_BLOCKS_PER_GROUP(sb) - 1);
	do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb));
3675
	if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) {
3676
		ext4_msg(sb, KERN_WARNING, "groups count too large: %u "
3677
		       "(block count %llu, first data block %u, "
3678
		       "blocks per group %lu)", sbi->s_groups_count,
3679 3680 3681 3682 3683
		       ext4_blocks_count(es),
		       le32_to_cpu(es->s_first_data_block),
		       EXT4_BLOCKS_PER_GROUP(sb));
		goto failed_mount;
	}
3684
	sbi->s_groups_count = blocks_count;
3685 3686
	sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count,
			(EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb)));
3687 3688
	db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
		   EXT4_DESC_PER_BLOCK(sb);
3689
	if (ext4_has_feature_meta_bg(sb)) {
3690
		if (le32_to_cpu(es->s_first_meta_bg) > db_count) {
3691 3692 3693 3694 3695 3696 3697
			ext4_msg(sb, KERN_WARNING,
				 "first meta block group too large: %u "
				 "(group descriptor block count %u)",
				 le32_to_cpu(es->s_first_meta_bg), db_count);
			goto failed_mount;
		}
	}
3698 3699 3700
	sbi->s_group_desc = ext4_kvmalloc(db_count *
					  sizeof(struct buffer_head *),
					  GFP_KERNEL);
3701
	if (sbi->s_group_desc == NULL) {
3702
		ext4_msg(sb, KERN_ERR, "not enough memory");
3703
		ret = -ENOMEM;
3704 3705 3706
		goto failed_mount;
	}

3707
	bgl_lock_init(sbi->s_blockgroup_lock);
3708 3709

	for (i = 0; i < db_count; i++) {
3710
		block = descriptor_loc(sb, logical_sb_block, i);
3711
		sbi->s_group_desc[i] = sb_bread_unmovable(sb, block);
3712
		if (!sbi->s_group_desc[i]) {
3713 3714
			ext4_msg(sb, KERN_ERR,
			       "can't read group descriptor %d", i);
3715 3716 3717 3718
			db_count = i;
			goto failed_mount2;
		}
	}
3719
	if (!ext4_check_descriptors(sb, logical_sb_block, &first_not_zeroed)) {
3720
		ext4_msg(sb, KERN_ERR, "group descriptors corrupted!");
3721
		ret = -EFSCORRUPTED;
3722
		goto failed_mount2;
3723
	}
3724

3725
	sbi->s_gdb_count = db_count;
3726 3727 3728
	get_random_bytes(&sbi->s_next_generation, sizeof(u32));
	spin_lock_init(&sbi->s_next_gen_lock);

3729 3730
	setup_timer(&sbi->s_err_report, print_daily_error_info,
		(unsigned long) sb);
3731

3732
	/* Register extent status tree shrinker */
3733
	if (ext4_es_register_shrinker(sbi))
3734 3735
		goto failed_mount3;

3736
	sbi->s_stripe = ext4_get_stripe_size(sbi);
3737
	sbi->s_extent_max_zeroout_kb = 32;
3738

3739 3740 3741
	/*
	 * set up enough so that it can read an inode
	 */
3742
	sb->s_op = &ext4_sops;
3743 3744
	sb->s_export_op = &ext4_export_ops;
	sb->s_xattr = ext4_xattr_handlers;
3745
#ifdef CONFIG_QUOTA
3746
	sb->dq_op = &ext4_quota_operations;
3747
	if (ext4_has_feature_quota(sb))
3748
		sb->s_qcop = &dquot_quotactl_sysfile_ops;
3749 3750
	else
		sb->s_qcop = &ext4_qctl_operations;
3751
	sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
3752
#endif
3753 3754
	memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));

3755
	INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
3756
	mutex_init(&sbi->s_orphan_lock);
3757 3758 3759 3760

	sb->s_root = NULL;

	needs_recovery = (es->s_last_orphan != 0 ||
3761
			  ext4_has_feature_journal_needs_recovery(sb));
3762

3763
	if (ext4_has_feature_mmp(sb) && !(sb->s_flags & MS_RDONLY))
3764
		if (ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block)))
3765
			goto failed_mount3a;
3766

3767 3768 3769 3770
	/*
	 * The first inode we look at is the journal inode.  Don't try
	 * root first: it may be modified in the journal!
	 */
3771
	if (!test_opt(sb, NOLOAD) && ext4_has_feature_journal(sb)) {
3772 3773
		err = ext4_load_journal(sb, es, journal_devnum);
		if (err)
3774
			goto failed_mount3a;
3775
	} else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) &&
3776
		   ext4_has_feature_journal_needs_recovery(sb)) {
3777 3778
		ext4_msg(sb, KERN_ERR, "required journal recovery "
		       "suppressed and not mounted read-only");
3779
		goto failed_mount_wq;
3780
	} else {
3781 3782 3783 3784 3785 3786 3787 3788 3789 3790 3791 3792 3793 3794 3795 3796 3797 3798 3799 3800 3801 3802 3803 3804 3805
		/* Nojournal mode, all journal mount options are illegal */
		if (test_opt2(sb, EXPLICIT_JOURNAL_CHECKSUM)) {
			ext4_msg(sb, KERN_ERR, "can't mount with "
				 "journal_checksum, fs mounted w/o journal");
			goto failed_mount_wq;
		}
		if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) {
			ext4_msg(sb, KERN_ERR, "can't mount with "
				 "journal_async_commit, fs mounted w/o journal");
			goto failed_mount_wq;
		}
		if (sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) {
			ext4_msg(sb, KERN_ERR, "can't mount with "
				 "commit=%lu, fs mounted w/o journal",
				 sbi->s_commit_interval / HZ);
			goto failed_mount_wq;
		}
		if (EXT4_MOUNT_DATA_FLAGS &
		    (sbi->s_mount_opt ^ sbi->s_def_mount_opt)) {
			ext4_msg(sb, KERN_ERR, "can't mount with "
				 "data=, fs mounted w/o journal");
			goto failed_mount_wq;
		}
		sbi->s_def_mount_opt &= EXT4_MOUNT_JOURNAL_CHECKSUM;
		clear_opt(sb, JOURNAL_CHECKSUM);
3806
		clear_opt(sb, DATA_FLAGS);
3807 3808 3809
		sbi->s_journal = NULL;
		needs_recovery = 0;
		goto no_journal;
3810 3811
	}

3812
	if (ext4_has_feature_64bit(sb) &&
3813 3814
	    !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0,
				       JBD2_FEATURE_INCOMPAT_64BIT)) {
3815
		ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature");
3816
		goto failed_mount_wq;
3817 3818
	}

3819 3820 3821 3822
	if (!set_journal_csum_feature_set(sb)) {
		ext4_msg(sb, KERN_ERR, "Failed to set journal checksum "
			 "feature set");
		goto failed_mount_wq;
3823
	}
3824

3825 3826 3827 3828 3829
	/* We have now updated the journal if required, so we can
	 * validate the data journaling mode. */
	switch (test_opt(sb, DATA_FLAGS)) {
	case 0:
		/* No mode set, assume a default based on the journal
3830 3831 3832
		 * capabilities: ORDERED_DATA if the journal can
		 * cope, else JOURNAL_DATA
		 */
3833 3834
		if (jbd2_journal_check_available_features
		    (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE))
3835
			set_opt(sb, ORDERED_DATA);
3836
		else
3837
			set_opt(sb, JOURNAL_DATA);
3838 3839
		break;

3840 3841
	case EXT4_MOUNT_ORDERED_DATA:
	case EXT4_MOUNT_WRITEBACK_DATA:
3842 3843
		if (!jbd2_journal_check_available_features
		    (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) {
3844 3845
			ext4_msg(sb, KERN_ERR, "Journal does not support "
			       "requested data journaling mode");
3846
			goto failed_mount_wq;
3847 3848 3849 3850
		}
	default:
		break;
	}
3851
	set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
3852

Bobi Jam's avatar
Bobi Jam committed
3853 3854
	sbi->s_journal->j_commit_callback = ext4_journal_commit_callback;

3855
no_journal:
3856 3857 3858 3859 3860 3861 3862 3863
	if (ext4_mballoc_ready) {
		sbi->s_mb_cache = ext4_xattr_create_cache(sb->s_id);
		if (!sbi->s_mb_cache) {
			ext4_msg(sb, KERN_ERR, "Failed to create an mb_cache");
			goto failed_mount_wq;
		}
	}

3864
	if ((DUMMY_ENCRYPTION_ENABLED(sbi) || ext4_has_feature_encrypt(sb)) &&
3865 3866 3867 3868 3869 3870
	    (blocksize != PAGE_CACHE_SIZE)) {
		ext4_msg(sb, KERN_ERR,
			 "Unsupported blocksize for fs encryption");
		goto failed_mount_wq;
	}

3871 3872 3873
	if (DUMMY_ENCRYPTION_ENABLED(sbi) && !(sb->s_flags & MS_RDONLY) &&
	    !ext4_has_feature_encrypt(sb)) {
		ext4_set_feature_encrypt(sb);
3874 3875 3876
		ext4_commit_super(sb, 1);
	}

3877 3878 3879 3880 3881 3882 3883
	/*
	 * Get the # of file system overhead blocks from the
	 * superblock if present.
	 */
	if (es->s_overhead_clusters)
		sbi->s_overhead = le32_to_cpu(es->s_overhead_clusters);
	else {
3884 3885
		err = ext4_calculate_overhead(sb);
		if (err)
3886 3887 3888
			goto failed_mount_wq;
	}

3889 3890 3891 3892
	/*
	 * The maximum number of concurrent works can be high and
	 * concurrency isn't really necessary.  Limit it to 1.
	 */
3893 3894 3895 3896
	EXT4_SB(sb)->rsv_conversion_wq =
		alloc_workqueue("ext4-rsv-conversion", WQ_MEM_RECLAIM | WQ_UNBOUND, 1);
	if (!EXT4_SB(sb)->rsv_conversion_wq) {
		printk(KERN_ERR "EXT4-fs: failed to create workqueue\n");
3897
		ret = -ENOMEM;
3898 3899 3900
		goto failed_mount4;
	}

3901
	/*
3902
	 * The jbd2_journal_load will have done any necessary log recovery,
3903 3904 3905
	 * so we can safely mount the rest of the filesystem now.
	 */

3906 3907
	root = ext4_iget(sb, EXT4_ROOT_INO);
	if (IS_ERR(root)) {
3908
		ext4_msg(sb, KERN_ERR, "get root inode failed");
3909
		ret = PTR_ERR(root);
3910
		root = NULL;
3911 3912 3913
		goto failed_mount4;
	}
	if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
3914
		ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck");
Al Viro's avatar
Al Viro committed
3915
		iput(root);
3916 3917
		goto failed_mount4;
	}
3918
	sb->s_root = d_make_root(root);
3919
	if (!sb->s_root) {
3920
		ext4_msg(sb, KERN_ERR, "get root dentry failed");
3921 3922 3923
		ret = -ENOMEM;
		goto failed_mount4;
	}
3924

3925 3926
	if (ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY))
		sb->s_flags |= MS_RDONLY;
3927 3928 3929 3930 3931

	/* determine the minimum size of new large inodes, if present */
	if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
		sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
						     EXT4_GOOD_OLD_INODE_SIZE;
3932
		if (ext4_has_feature_extra_isize(sb)) {
3933 3934 3935 3936 3937 3938 3939 3940 3941 3942 3943 3944 3945 3946 3947
			if (sbi->s_want_extra_isize <
			    le16_to_cpu(es->s_want_extra_isize))
				sbi->s_want_extra_isize =
					le16_to_cpu(es->s_want_extra_isize);
			if (sbi->s_want_extra_isize <
			    le16_to_cpu(es->s_min_extra_isize))
				sbi->s_want_extra_isize =
					le16_to_cpu(es->s_min_extra_isize);
		}
	}
	/* Check if enough inode space is available */
	if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize >
							sbi->s_inode_size) {
		sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
						       EXT4_GOOD_OLD_INODE_SIZE;
3948 3949
		ext4_msg(sb, KERN_INFO, "required extra inode space not"
			 "available");
3950 3951
	}

3952
	ext4_set_resv_clusters(sb);
3953

3954 3955
	err = ext4_setup_system_zone(sb);
	if (err) {
3956
		ext4_msg(sb, KERN_ERR, "failed to initialize system "
3957
			 "zone (%d)", err);
3958 3959 3960 3961 3962 3963 3964 3965
		goto failed_mount4a;
	}

	ext4_ext_init(sb);
	err = ext4_mb_init(sb);
	if (err) {
		ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)",
			 err);
3966
		goto failed_mount5;
3967 3968
	}

3969 3970 3971
	block = ext4_count_free_clusters(sb);
	ext4_free_blocks_count_set(sbi->s_es, 
				   EXT4_C2B(sbi, block));
3972 3973
	err = percpu_counter_init(&sbi->s_freeclusters_counter, block,
				  GFP_KERNEL);
3974 3975 3976
	if (!err) {
		unsigned long freei = ext4_count_free_inodes(sb);
		sbi->s_es->s_free_inodes_count = cpu_to_le32(freei);
3977 3978
		err = percpu_counter_init(&sbi->s_freeinodes_counter, freei,
					  GFP_KERNEL);
3979 3980 3981
	}
	if (!err)
		err = percpu_counter_init(&sbi->s_dirs_counter,
3982
					  ext4_count_dirs(sb), GFP_KERNEL);
3983
	if (!err)
3984 3985
		err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0,
					  GFP_KERNEL);
3986 3987 3988 3989 3990
	if (err) {
		ext4_msg(sb, KERN_ERR, "insufficient memory");
		goto failed_mount6;
	}

3991
	if (ext4_has_feature_flex_bg(sb))
3992 3993 3994 3995 3996 3997 3998
		if (!ext4_fill_flex_info(sb)) {
			ext4_msg(sb, KERN_ERR,
			       "unable to initialize "
			       "flex_bg meta info!");
			goto failed_mount6;
		}

3999 4000
	err = ext4_register_li_request(sb, first_not_zeroed);
	if (err)
4001
		goto failed_mount6;
4002

4003
	err = ext4_register_sysfs(sb);
4004 4005
	if (err)
		goto failed_mount7;
Theodore Ts'o's avatar
Theodore Ts'o committed
4006

4007 4008
#ifdef CONFIG_QUOTA
	/* Enable quota usage during mount. */
4009
	if (ext4_has_feature_quota(sb) && !(sb->s_flags & MS_RDONLY)) {
4010 4011 4012 4013 4014 4015
		err = ext4_enable_quotas(sb);
		if (err)
			goto failed_mount8;
	}
#endif  /* CONFIG_QUOTA */

4016 4017 4018
	EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
	ext4_orphan_cleanup(sb, es);
	EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
4019
	if (needs_recovery) {
4020
		ext4_msg(sb, KERN_INFO, "recovery complete");
4021 4022 4023 4024 4025 4026 4027 4028 4029 4030 4031 4032
		ext4_mark_recovery_complete(sb, es);
	}
	if (EXT4_SB(sb)->s_journal) {
		if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA)
			descr = " journalled data mode";
		else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA)
			descr = " ordered data mode";
		else
			descr = " writeback data mode";
	} else
		descr = "out journal";

4033 4034 4035 4036 4037 4038 4039 4040
	if (test_opt(sb, DISCARD)) {
		struct request_queue *q = bdev_get_queue(sb->s_bdev);
		if (!blk_queue_discard(q))
			ext4_msg(sb, KERN_WARNING,
				 "mounting with \"discard\" option, but "
				 "the device does not support discard");
	}

4041 4042
	if (___ratelimit(&ext4_mount_msg_ratelimit, "EXT4-fs mount"))
		ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. "
4043 4044 4045
			 "Opts: %.*s%s%s", descr,
			 (int) sizeof(sbi->s_es->s_mount_opts),
			 sbi->s_es->s_mount_opts,
4046
			 *sbi->s_es->s_mount_opts ? "; " : "", orig_data);
4047

4048 4049
	if (es->s_error_count)
		mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */
4050

4051 4052 4053 4054 4055
	/* Enable message ratelimiting. Default is 10 messages per 5 secs. */
	ratelimit_state_init(&sbi->s_err_ratelimit_state, 5 * HZ, 10);
	ratelimit_state_init(&sbi->s_warning_ratelimit_state, 5 * HZ, 10);
	ratelimit_state_init(&sbi->s_msg_ratelimit_state, 5 * HZ, 10);

4056
	kfree(orig_data);
4057 4058
	return 0;

4059
cantfind_ext4:
4060
	if (!silent)
4061
		ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem");
4062 4063
	goto failed_mount;

4064 4065
#ifdef CONFIG_QUOTA
failed_mount8:
4066
	ext4_unregister_sysfs(sb);
4067
#endif
4068 4069 4070
failed_mount7:
	ext4_unregister_li_request(sb);
failed_mount6:
4071
	ext4_mb_release(sb);
4072
	if (sbi->s_flex_groups)
Al Viro's avatar
Al Viro committed
4073
		kvfree(sbi->s_flex_groups);
4074 4075 4076 4077
	percpu_counter_destroy(&sbi->s_freeclusters_counter);
	percpu_counter_destroy(&sbi->s_freeinodes_counter);
	percpu_counter_destroy(&sbi->s_dirs_counter);
	percpu_counter_destroy(&sbi->s_dirtyclusters_counter);
4078
failed_mount5:
4079 4080 4081
	ext4_ext_release(sb);
	ext4_release_system_zone(sb);
failed_mount4a:
Al Viro's avatar
Al Viro committed
4082
	dput(sb->s_root);
4083
	sb->s_root = NULL;
Al Viro's avatar
Al Viro committed
4084
failed_mount4:
4085
	ext4_msg(sb, KERN_ERR, "mount failed");
4086 4087
	if (EXT4_SB(sb)->rsv_conversion_wq)
		destroy_workqueue(EXT4_SB(sb)->rsv_conversion_wq);
4088
failed_mount_wq:
4089 4090 4091 4092
	if (sbi->s_journal) {
		jbd2_journal_destroy(sbi->s_journal);
		sbi->s_journal = NULL;
	}
4093
failed_mount3a:
4094
	ext4_es_unregister_shrinker(sbi);
4095
failed_mount3:
4096
	del_timer_sync(&sbi->s_err_report);
4097 4098
	if (sbi->s_mmp_tsk)
		kthread_stop(sbi->s_mmp_tsk);
4099 4100 4101
failed_mount2:
	for (i = 0; i < db_count; i++)
		brelse(sbi->s_group_desc[i]);
Al Viro's avatar
Al Viro committed
4102
	kvfree(sbi->s_group_desc);
4103
failed_mount:
4104 4105
	if (sbi->s_chksum_driver)
		crypto_free_shash(sbi->s_chksum_driver);
4106
#ifdef CONFIG_QUOTA
Jan Kara's avatar
Jan Kara committed
4107
	for (i = 0; i < EXT4_MAXQUOTAS; i++)
4108 4109
		kfree(sbi->s_qf_names[i]);
#endif
4110
	ext4_blkdev_remove(sbi);
4111 4112 4113
	brelse(bh);
out_fail:
	sb->s_fs_info = NULL;
4114
	kfree(sbi->s_blockgroup_lock);
4115
out_free_base:
4116
	kfree(sbi);
4117
	kfree(orig_data);
4118
	return err ? err : ret;
4119 4120 4121 4122 4123 4124 4125
}

/*
 * Setup any per-fs journal parameters now.  We'll do this both on
 * initial mount, once the journal has been initialised but before we've
 * done any recovery; and again on any subsequent remount.
 */
4126
static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
4127
{
4128
	struct ext4_sb_info *sbi = EXT4_SB(sb);
4129

4130 4131 4132
	journal->j_commit_interval = sbi->s_commit_interval;
	journal->j_min_batch_time = sbi->s_min_batch_time;
	journal->j_max_batch_time = sbi->s_max_batch_time;
4133

4134
	write_lock(&journal->j_state_lock);
4135
	if (test_opt(sb, BARRIER))
4136
		journal->j_flags |= JBD2_BARRIER;
4137
	else
4138
		journal->j_flags &= ~JBD2_BARRIER;
4139 4140 4141 4142
	if (test_opt(sb, DATA_ERR_ABORT))
		journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
	else
		journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
4143
	write_unlock(&journal->j_state_lock);
4144 4145
}

4146
static journal_t *ext4_get_journal(struct super_block *sb,
4147 4148 4149 4150 4151
				   unsigned int journal_inum)
{
	struct inode *journal_inode;
	journal_t *journal;

4152
	BUG_ON(!ext4_has_feature_journal(sb));
4153

4154 4155 4156 4157
	/* First, test for the existence of a valid inode on disk.  Bad
	 * things happen if we iget() an unused inode, as the subsequent
	 * iput() will try to delete it. */

4158 4159
	journal_inode = ext4_iget(sb, journal_inum);
	if (IS_ERR(journal_inode)) {
4160
		ext4_msg(sb, KERN_ERR, "no journal found");
4161 4162 4163 4164 4165
		return NULL;
	}
	if (!journal_inode->i_nlink) {
		make_bad_inode(journal_inode);
		iput(journal_inode);
4166
		ext4_msg(sb, KERN_ERR, "journal inode is deleted");
4167 4168 4169
		return NULL;
	}

4170
	jbd_debug(2, "Journal inode found at %p: %lld bytes\n",
4171
		  journal_inode, journal_inode->i_size);
4172
	if (!S_ISREG(journal_inode->i_mode)) {
4173
		ext4_msg(sb, KERN_ERR, "invalid journal inode");
4174 4175 4176 4177
		iput(journal_inode);
		return NULL;
	}

4178
	journal = jbd2_journal_init_inode(journal_inode);
4179
	if (!journal) {
4180
		ext4_msg(sb, KERN_ERR, "Could not load journal inode");
4181 4182 4183 4184
		iput(journal_inode);
		return NULL;
	}
	journal->j_private = sb;
4185
	ext4_init_journal_params(sb, journal);
4186 4187 4188
	return journal;
}

4189
static journal_t *ext4_get_dev_journal(struct super_block *sb,
4190 4191
				       dev_t j_dev)
{
4192
	struct buffer_head *bh;
4193
	journal_t *journal;
4194 4195
	ext4_fsblk_t start;
	ext4_fsblk_t len;
4196
	int hblock, blocksize;
4197
	ext4_fsblk_t sb_block;
4198
	unsigned long offset;
4199
	struct ext4_super_block *es;
4200 4201
	struct block_device *bdev;

4202
	BUG_ON(!ext4_has_feature_journal(sb));
4203

4204
	bdev = ext4_blkdev_get(j_dev, sb);
4205 4206 4207 4208
	if (bdev == NULL)
		return NULL;

	blocksize = sb->s_blocksize;
4209
	hblock = bdev_logical_block_size(bdev);
4210
	if (blocksize < hblock) {
4211 4212
		ext4_msg(sb, KERN_ERR,
			"blocksize too small for journal device");
4213 4214 4215
		goto out_bdev;
	}

4216 4217
	sb_block = EXT4_MIN_BLOCK_SIZE / blocksize;
	offset = EXT4_MIN_BLOCK_SIZE % blocksize;
4218 4219
	set_blocksize(bdev, blocksize);
	if (!(bh = __bread(bdev, sb_block, blocksize))) {
4220 4221
		ext4_msg(sb, KERN_ERR, "couldn't read superblock of "
		       "external journal");
4222 4223 4224
		goto out_bdev;
	}

4225
	es = (struct ext4_super_block *) (bh->b_data + offset);
4226
	if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) ||
4227
	    !(le32_to_cpu(es->s_feature_incompat) &
4228
	      EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) {
4229 4230
		ext4_msg(sb, KERN_ERR, "external journal has "
					"bad superblock");
4231 4232 4233 4234
		brelse(bh);
		goto out_bdev;
	}

4235 4236 4237 4238 4239 4240 4241 4242 4243
	if ((le32_to_cpu(es->s_feature_ro_compat) &
	     EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) &&
	    es->s_checksum != ext4_superblock_csum(sb, es)) {
		ext4_msg(sb, KERN_ERR, "external journal has "
				       "corrupt superblock");
		brelse(bh);
		goto out_bdev;
	}

4244
	if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) {
4245
		ext4_msg(sb, KERN_ERR, "journal UUID does not match");
4246 4247 4248 4249
		brelse(bh);
		goto out_bdev;
	}

4250
	len = ext4_blocks_count(es);
4251 4252 4253
	start = sb_block + 1;
	brelse(bh);	/* we're done with the superblock */

4254
	journal = jbd2_journal_init_dev(bdev, sb->s_bdev,
4255 4256
					start, len, blocksize);
	if (!journal) {
4257
		ext4_msg(sb, KERN_ERR, "failed to create device journal");
4258 4259 4260
		goto out_bdev;
	}
	journal->j_private = sb;
4261
	ll_rw_block(READ | REQ_META | REQ_PRIO, 1, &journal->j_sb_buffer);
4262 4263
	wait_on_buffer(journal->j_sb_buffer);
	if (!buffer_uptodate(journal->j_sb_buffer)) {
4264
		ext4_msg(sb, KERN_ERR, "I/O error on journal device");
4265 4266 4267
		goto out_journal;
	}
	if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) {
4268 4269
		ext4_msg(sb, KERN_ERR, "External journal has more than one "
					"user (unsupported) - %d",
4270 4271 4272
			be32_to_cpu(journal->j_superblock->s_nr_users));
		goto out_journal;
	}
4273 4274
	EXT4_SB(sb)->journal_bdev = bdev;
	ext4_init_journal_params(sb, journal);
4275
	return journal;
4276

4277
out_journal:
4278
	jbd2_journal_destroy(journal);
4279
out_bdev:
4280
	ext4_blkdev_put(bdev);
4281 4282 4283
	return NULL;
}

4284 4285
static int ext4_load_journal(struct super_block *sb,
			     struct ext4_super_block *es,
4286 4287 4288 4289 4290 4291 4292 4293
			     unsigned long journal_devnum)
{
	journal_t *journal;
	unsigned int journal_inum = le32_to_cpu(es->s_journal_inum);
	dev_t journal_dev;
	int err = 0;
	int really_read_only;

4294
	BUG_ON(!ext4_has_feature_journal(sb));
4295

4296 4297
	if (journal_devnum &&
	    journal_devnum != le32_to_cpu(es->s_journal_dev)) {
4298 4299
		ext4_msg(sb, KERN_INFO, "external journal device major/minor "
			"numbers have changed");
4300 4301 4302 4303 4304 4305 4306 4307 4308 4309 4310
		journal_dev = new_decode_dev(journal_devnum);
	} else
		journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev));

	really_read_only = bdev_read_only(sb->s_bdev);

	/*
	 * Are we loading a blank journal or performing recovery after a
	 * crash?  For recovery, we need to check in advance whether we
	 * can get read-write access to the device.
	 */
4311
	if (ext4_has_feature_journal_needs_recovery(sb)) {
4312
		if (sb->s_flags & MS_RDONLY) {
4313 4314
			ext4_msg(sb, KERN_INFO, "INFO: recovery "
					"required on readonly filesystem");
4315
			if (really_read_only) {
4316 4317
				ext4_msg(sb, KERN_ERR, "write access "
					"unavailable, cannot proceed");
4318 4319
				return -EROFS;
			}
4320 4321
			ext4_msg(sb, KERN_INFO, "write access will "
			       "be enabled during recovery");
4322 4323 4324 4325
		}
	}

	if (journal_inum && journal_dev) {
4326 4327
		ext4_msg(sb, KERN_ERR, "filesystem has both journal "
		       "and inode journals!");
4328 4329 4330 4331
		return -EINVAL;
	}

	if (journal_inum) {
4332
		if (!(journal = ext4_get_journal(sb, journal_inum)))
4333 4334
			return -EINVAL;
	} else {
4335
		if (!(journal = ext4_get_dev_journal(sb, journal_dev)))
4336 4337 4338
			return -EINVAL;
	}

4339
	if (!(journal->j_flags & JBD2_BARRIER))
4340
		ext4_msg(sb, KERN_INFO, "barriers disabled");
4341

4342
	if (!ext4_has_feature_journal_needs_recovery(sb))
4343
		err = jbd2_journal_wipe(journal, !really_read_only);
4344 4345 4346 4347 4348
	if (!err) {
		char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL);
		if (save)
			memcpy(save, ((char *) es) +
			       EXT4_S_ERR_START, EXT4_S_ERR_LEN);
4349
		err = jbd2_journal_load(journal);
4350 4351 4352 4353 4354
		if (save)
			memcpy(((char *) es) + EXT4_S_ERR_START,
			       save, EXT4_S_ERR_LEN);
		kfree(save);
	}
4355 4356

	if (err) {
4357
		ext4_msg(sb, KERN_ERR, "error loading journal");
4358
		jbd2_journal_destroy(journal);
4359 4360 4361
		return err;
	}

4362 4363
	EXT4_SB(sb)->s_journal = journal;
	ext4_clear_journal_err(sb, es);
4364

4365
	if (!really_read_only && journal_devnum &&
4366 4367 4368 4369
	    journal_devnum != le32_to_cpu(es->s_journal_dev)) {
		es->s_journal_dev = cpu_to_le32(journal_devnum);

		/* Make sure we flush the recovery flag to disk. */
4370
		ext4_commit_super(sb, 1);
4371 4372 4373 4374 4375
	}

	return 0;
}

4376
static int ext4_commit_super(struct super_block *sb, int sync)
4377
{
4378
	struct ext4_super_block *es = EXT4_SB(sb)->s_es;
4379
	struct buffer_head *sbh = EXT4_SB(sb)->s_sbh;
4380
	int error = 0;
4381

4382
	if (!sbh || block_device_ejected(sb))
4383
		return error;
4384 4385 4386 4387 4388 4389 4390 4391 4392
	if (buffer_write_io_error(sbh)) {
		/*
		 * Oh, dear.  A previous attempt to write the
		 * superblock failed.  This could happen because the
		 * USB device was yanked out.  Or it could happen to
		 * be a transient write error and maybe the block will
		 * be remapped.  Nothing we can do but to retry the
		 * write and hope for the best.
		 */
4393 4394
		ext4_msg(sb, KERN_ERR, "previous I/O error to "
		       "superblock detected");
4395 4396 4397
		clear_buffer_write_io_error(sbh);
		set_buffer_uptodate(sbh);
	}
4398 4399 4400 4401 4402 4403 4404 4405 4406 4407 4408 4409
	/*
	 * If the file system is mounted read-only, don't update the
	 * superblock write time.  This avoids updating the superblock
	 * write time when we are mounting the root file system
	 * read/only but we need to replay the journal; at that point,
	 * for people who are east of GMT and who make their clock
	 * tick in localtime for Windows bug-for-bug compatibility,
	 * the clock is set in the future, and this will cause e2fsck
	 * to complain and force a full file system check.
	 */
	if (!(sb->s_flags & MS_RDONLY))
		es->s_wtime = cpu_to_le32(get_seconds());
4410 4411 4412
	if (sb->s_bdev->bd_part)
		es->s_kbytes_written =
			cpu_to_le64(EXT4_SB(sb)->s_kbytes_written +
4413 4414
			    ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) -
			      EXT4_SB(sb)->s_sectors_written_start) >> 1));
4415 4416 4417
	else
		es->s_kbytes_written =
			cpu_to_le64(EXT4_SB(sb)->s_kbytes_written);
4418 4419
	if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeclusters_counter))
		ext4_free_blocks_count_set(es,
4420 4421
			EXT4_C2B(EXT4_SB(sb), percpu_counter_sum_positive(
				&EXT4_SB(sb)->s_freeclusters_counter)));
4422 4423 4424
	if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeinodes_counter))
		es->s_free_inodes_count =
			cpu_to_le32(percpu_counter_sum_positive(
4425
				&EXT4_SB(sb)->s_freeinodes_counter));
4426
	BUFFER_TRACE(sbh, "marking dirty");
4427
	ext4_superblock_csum_set(sb);
4428
	mark_buffer_dirty(sbh);
4429
	if (sync) {
4430 4431
		error = __sync_dirty_buffer(sbh,
			test_opt(sb, BARRIER) ? WRITE_FUA : WRITE_SYNC);
4432 4433 4434 4435 4436
		if (error)
			return error;

		error = buffer_write_io_error(sbh);
		if (error) {
4437 4438
			ext4_msg(sb, KERN_ERR, "I/O error while writing "
			       "superblock");
4439 4440 4441 4442
			clear_buffer_write_io_error(sbh);
			set_buffer_uptodate(sbh);
		}
	}
4443
	return error;
4444 4445 4446 4447 4448 4449 4450
}

/*
 * Have we just finished recovery?  If so, and if we are mounting (or
 * remounting) the filesystem readonly, then we will end up with a
 * consistent fs on disk.  Record that fact.
 */
4451 4452
static void ext4_mark_recovery_complete(struct super_block *sb,
					struct ext4_super_block *es)
4453
{
4454
	journal_t *journal = EXT4_SB(sb)->s_journal;
4455

4456
	if (!ext4_has_feature_journal(sb)) {
4457 4458 4459
		BUG_ON(journal != NULL);
		return;
	}
4460
	jbd2_journal_lock_updates(journal);
4461 4462 4463
	if (jbd2_journal_flush(journal) < 0)
		goto out;

4464
	if (ext4_has_feature_journal_needs_recovery(sb) &&
4465
	    sb->s_flags & MS_RDONLY) {
4466
		ext4_clear_feature_journal_needs_recovery(sb);
4467
		ext4_commit_super(sb, 1);
4468
	}
4469 4470

out:
4471
	jbd2_journal_unlock_updates(journal);
4472 4473 4474 4475 4476 4477 4478
}

/*
 * If we are mounting (or read-write remounting) a filesystem whose journal
 * has recorded an error from a previous lifetime, move that error to the
 * main filesystem now.
 */
4479 4480
static void ext4_clear_journal_err(struct super_block *sb,
				   struct ext4_super_block *es)
4481 4482 4483 4484 4485
{
	journal_t *journal;
	int j_errno;
	const char *errstr;

4486
	BUG_ON(!ext4_has_feature_journal(sb));
4487

4488
	journal = EXT4_SB(sb)->s_journal;
4489 4490 4491

	/*
	 * Now check for any error status which may have been recorded in the
4492
	 * journal by a prior ext4_error() or ext4_abort()
4493 4494
	 */

4495
	j_errno = jbd2_journal_errno(journal);
4496 4497 4498
	if (j_errno) {
		char nbuf[16];

4499
		errstr = ext4_decode_error(sb, j_errno, nbuf);
4500
		ext4_warning(sb, "Filesystem error recorded "
4501
			     "from previous mount: %s", errstr);
4502
		ext4_warning(sb, "Marking fs in need of filesystem check.");
4503

4504 4505
		EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
		es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
4506
		ext4_commit_super(sb, 1);
4507

4508
		jbd2_journal_clear_err(journal);
4509
		jbd2_journal_update_sb_errno(journal);
4510 4511 4512 4513 4514 4515 4516
	}
}

/*
 * Force the running and committing transactions to commit,
 * and wait on the commit.
 */
4517
int ext4_force_commit(struct super_block *sb)
4518 4519 4520 4521 4522 4523
{
	journal_t *journal;

	if (sb->s_flags & MS_RDONLY)
		return 0;

4524
	journal = EXT4_SB(sb)->s_journal;
4525
	return ext4_journal_force_commit(journal);
4526 4527
}

4528
static int ext4_sync_fs(struct super_block *sb, int wait)
4529
{
4530
	int ret = 0;
4531
	tid_t target;
4532
	bool needs_barrier = false;
4533
	struct ext4_sb_info *sbi = EXT4_SB(sb);
4534

4535
	trace_ext4_sync_fs(sb, wait);
4536
	flush_workqueue(sbi->rsv_conversion_wq);
4537 4538 4539 4540 4541
	/*
	 * Writeback quota in non-journalled quota case - journalled quota has
	 * no dirty dquots
	 */
	dquot_writeback_dquots(sb, -1);
4542 4543 4544 4545 4546
	/*
	 * Data writeback is possible w/o journal transaction, so barrier must
	 * being sent at the end of the function. But we can skip it if
	 * transaction_commit will do it for us.
	 */
4547 4548 4549 4550 4551 4552 4553 4554 4555 4556 4557 4558
	if (sbi->s_journal) {
		target = jbd2_get_latest_transaction(sbi->s_journal);
		if (wait && sbi->s_journal->j_flags & JBD2_BARRIER &&
		    !jbd2_trans_will_send_data_barrier(sbi->s_journal, target))
			needs_barrier = true;

		if (jbd2_journal_start_commit(sbi->s_journal, &target)) {
			if (wait)
				ret = jbd2_log_wait_commit(sbi->s_journal,
							   target);
		}
	} else if (wait && test_opt(sb, BARRIER))
4559 4560 4561 4562 4563 4564
		needs_barrier = true;
	if (needs_barrier) {
		int err;
		err = blkdev_issue_flush(sb->s_bdev, GFP_KERNEL, NULL);
		if (!ret)
			ret = err;
4565
	}
4566 4567 4568 4569

	return ret;
}

4570 4571 4572
/*
 * LVM calls this function before a (read-only) snapshot is created.  This
 * gives us a chance to flush the journal completely and mark the fs clean.
4573 4574
 *
 * Note that only this function cannot bring a filesystem to be in a clean
4575 4576
 * state independently. It relies on upper layer to stop all data & metadata
 * modifications.
4577
 */
4578
static int ext4_freeze(struct super_block *sb)
4579
{
4580 4581
	int error = 0;
	journal_t *journal;
4582

4583 4584
	if (sb->s_flags & MS_RDONLY)
		return 0;
4585

4586
	journal = EXT4_SB(sb)->s_journal;
4587

4588 4589 4590
	if (journal) {
		/* Now we set up the journal barrier. */
		jbd2_journal_lock_updates(journal);
4591

4592 4593 4594 4595 4596 4597 4598
		/*
		 * Don't clear the needs_recovery flag if we failed to
		 * flush the journal.
		 */
		error = jbd2_journal_flush(journal);
		if (error < 0)
			goto out;
4599 4600

		/* Journal blocked and flushed, clear needs_recovery flag. */
4601
		ext4_clear_feature_journal_needs_recovery(sb);
4602
	}
4603 4604

	error = ext4_commit_super(sb, 1);
4605
out:
4606 4607 4608
	if (journal)
		/* we rely on upper layer to stop further updates */
		jbd2_journal_unlock_updates(journal);
4609
	return error;
4610 4611 4612 4613 4614 4615
}

/*
 * Called by LVM after the snapshot is done.  We need to reset the RECOVER
 * flag here, even though the filesystem is not technically dirty yet.
 */
4616
static int ext4_unfreeze(struct super_block *sb)
4617
{
4618 4619 4620
	if (sb->s_flags & MS_RDONLY)
		return 0;

4621 4622
	if (EXT4_SB(sb)->s_journal) {
		/* Reset the needs_recovery flag before the fs is unlocked. */
4623
		ext4_set_feature_journal_needs_recovery(sb);
4624 4625
	}

4626
	ext4_commit_super(sb, 1);
4627
	return 0;
4628 4629
}

4630 4631 4632 4633 4634
/*
 * Structure to save mount options for ext4_remount's benefit
 */
struct ext4_mount_options {
	unsigned long s_mount_opt;
4635
	unsigned long s_mount_opt2;
4636 4637
	kuid_t s_resuid;
	kgid_t s_resgid;
4638 4639 4640 4641
	unsigned long s_commit_interval;
	u32 s_min_batch_time, s_max_batch_time;
#ifdef CONFIG_QUOTA
	int s_jquota_fmt;
Jan Kara's avatar
Jan Kara committed
4642
	char *s_qf_names[EXT4_MAXQUOTAS];
4643 4644 4645
#endif
};

4646
static int ext4_remount(struct super_block *sb, int *flags, char *data)
4647
{
4648
	struct ext4_super_block *es;
4649
	struct ext4_sb_info *sbi = EXT4_SB(sb);
4650
	unsigned long old_sb_flags;
4651
	struct ext4_mount_options old_opts;
4652
	int enable_quota = 0;
4653
	ext4_group_t g;
4654
	unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
4655
	int err = 0;
4656
#ifdef CONFIG_QUOTA
4657
	int i, j;
4658
#endif
4659
	char *orig_data = kstrdup(data, GFP_KERNEL);
4660 4661 4662 4663

	/* Store the original options */
	old_sb_flags = sb->s_flags;
	old_opts.s_mount_opt = sbi->s_mount_opt;
4664
	old_opts.s_mount_opt2 = sbi->s_mount_opt2;
4665 4666 4667
	old_opts.s_resuid = sbi->s_resuid;
	old_opts.s_resgid = sbi->s_resgid;
	old_opts.s_commit_interval = sbi->s_commit_interval;
4668 4669
	old_opts.s_min_batch_time = sbi->s_min_batch_time;
	old_opts.s_max_batch_time = sbi->s_max_batch_time;
4670 4671
#ifdef CONFIG_QUOTA
	old_opts.s_jquota_fmt = sbi->s_jquota_fmt;
Jan Kara's avatar
Jan Kara committed
4672
	for (i = 0; i < EXT4_MAXQUOTAS; i++)
4673 4674 4675 4676 4677 4678
		if (sbi->s_qf_names[i]) {
			old_opts.s_qf_names[i] = kstrdup(sbi->s_qf_names[i],
							 GFP_KERNEL);
			if (!old_opts.s_qf_names[i]) {
				for (j = 0; j < i; j++)
					kfree(old_opts.s_qf_names[j]);
4679
				kfree(orig_data);
4680 4681 4682 4683
				return -ENOMEM;
			}
		} else
			old_opts.s_qf_names[i] = NULL;
4684
#endif
4685 4686
	if (sbi->s_journal && sbi->s_journal->j_task->io_context)
		journal_ioprio = sbi->s_journal->j_task->io_context->ioprio;
4687

4688
	if (!parse_options(data, sb, NULL, &journal_ioprio, 1)) {
4689 4690 4691 4692
		err = -EINVAL;
		goto restore_opts;
	}

4693
	if ((old_opts.s_mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) ^
4694 4695
	    test_opt(sb, JOURNAL_CHECKSUM)) {
		ext4_msg(sb, KERN_ERR, "changing journal_checksum "
4696 4697
			 "during remount not supported; ignoring");
		sbi->s_mount_opt ^= EXT4_MOUNT_JOURNAL_CHECKSUM;
4698 4699
	}

4700 4701 4702 4703 4704 4705 4706 4707 4708 4709 4710 4711 4712
	if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
		if (test_opt2(sb, EXPLICIT_DELALLOC)) {
			ext4_msg(sb, KERN_ERR, "can't mount with "
				 "both data=journal and delalloc");
			err = -EINVAL;
			goto restore_opts;
		}
		if (test_opt(sb, DIOREAD_NOLOCK)) {
			ext4_msg(sb, KERN_ERR, "can't mount with "
				 "both data=journal and dioread_nolock");
			err = -EINVAL;
			goto restore_opts;
		}
Ross Zwisler's avatar
Ross Zwisler committed
4713 4714 4715 4716 4717 4718 4719 4720 4721 4722 4723 4724
		if (test_opt(sb, DAX)) {
			ext4_msg(sb, KERN_ERR, "can't mount with "
				 "both data=journal and dax");
			err = -EINVAL;
			goto restore_opts;
		}
	}

	if ((sbi->s_mount_opt ^ old_opts.s_mount_opt) & EXT4_MOUNT_DAX) {
		ext4_msg(sb, KERN_WARNING, "warning: refusing change of "
			"dax flag with busy inodes while remounting");
		sbi->s_mount_opt ^= EXT4_MOUNT_DAX;
4725 4726
	}

4727
	if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
4728
		ext4_abort(sb, "Abort forced by user");
4729 4730

	sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
4731
		(test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
4732 4733 4734

	es = sbi->s_es;

4735
	if (sbi->s_journal) {
4736
		ext4_init_journal_params(sb, sbi->s_journal);
4737 4738
		set_task_ioprio(sbi->s_journal->j_task, journal_ioprio);
	}
4739

4740 4741 4742
	if (*flags & MS_LAZYTIME)
		sb->s_flags |= MS_LAZYTIME;

4743
	if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
4744
		if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) {
4745 4746 4747 4748 4749
			err = -EROFS;
			goto restore_opts;
		}

		if (*flags & MS_RDONLY) {
4750 4751 4752
			err = sync_filesystem(sb);
			if (err < 0)
				goto restore_opts;
4753 4754
			err = dquot_suspend(sb, -1);
			if (err < 0)
4755 4756
				goto restore_opts;

4757 4758 4759 4760 4761 4762 4763 4764 4765 4766 4767
			/*
			 * First of all, the unconditional stuff we have to do
			 * to disable replay of the journal when we next remount
			 */
			sb->s_flags |= MS_RDONLY;

			/*
			 * OK, test if we are remounting a valid rw partition
			 * readonly, and if so set the rdonly flag and then
			 * mark the partition as valid again.
			 */
4768 4769
			if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) &&
			    (sbi->s_mount_state & EXT4_VALID_FS))
4770 4771
				es->s_state = cpu_to_le16(sbi->s_mount_state);

4772
			if (sbi->s_journal)
4773
				ext4_mark_recovery_complete(sb, es);
4774
		} else {
4775
			/* Make sure we can mount this feature set readwrite */
4776
			if (ext4_has_feature_readonly(sb) ||
4777
			    !ext4_feature_set_ok(sb, 0)) {
4778 4779 4780
				err = -EROFS;
				goto restore_opts;
			}
4781 4782
			/*
			 * Make sure the group descriptor checksums
4783
			 * are sane.  If they aren't, refuse to remount r/w.
4784 4785 4786 4787 4788
			 */
			for (g = 0; g < sbi->s_groups_count; g++) {
				struct ext4_group_desc *gdp =
					ext4_get_group_desc(sb, g, NULL);

4789
				if (!ext4_group_desc_csum_verify(sb, g, gdp)) {
4790 4791
					ext4_msg(sb, KERN_ERR,
	       "ext4_remount: Checksum for group %u failed (%u!=%u)",
4792
		g, le16_to_cpu(ext4_group_desc_csum(sb, g, gdp)),
4793
					       le16_to_cpu(gdp->bg_checksum));
4794
					err = -EFSBADCRC;
4795 4796 4797 4798
					goto restore_opts;
				}
			}

4799 4800 4801 4802 4803 4804
			/*
			 * If we have an unprocessed orphan list hanging
			 * around from a previously readonly bdev mount,
			 * require a full umount/remount for now.
			 */
			if (es->s_last_orphan) {
4805
				ext4_msg(sb, KERN_WARNING, "Couldn't "
4806 4807
				       "remount RDWR because of unprocessed "
				       "orphan inode list.  Please "
4808
				       "umount/remount instead");
4809 4810 4811 4812
				err = -EINVAL;
				goto restore_opts;
			}

4813 4814 4815 4816 4817 4818
			/*
			 * Mounting a RDONLY partition read-write, so reread
			 * and store the current valid flag.  (It may have
			 * been changed by e2fsck since we originally mounted
			 * the partition.)
			 */
4819 4820
			if (sbi->s_journal)
				ext4_clear_journal_err(sb, es);
4821
			sbi->s_mount_state = le16_to_cpu(es->s_state);
4822
			if (!ext4_setup_super(sb, es, 0))
4823
				sb->s_flags &= ~MS_RDONLY;
4824
			if (ext4_has_feature_mmp(sb))
4825 4826 4827 4828 4829
				if (ext4_multi_mount_protect(sb,
						le64_to_cpu(es->s_mmp_block))) {
					err = -EROFS;
					goto restore_opts;
				}
4830
			enable_quota = 1;
4831 4832
		}
	}
4833 4834 4835 4836 4837 4838 4839 4840 4841 4842 4843 4844 4845

	/*
	 * Reinitialize lazy itable initialization thread based on
	 * current settings
	 */
	if ((sb->s_flags & MS_RDONLY) || !test_opt(sb, INIT_INODE_TABLE))
		ext4_unregister_li_request(sb);
	else {
		ext4_group_t first_not_zeroed;
		first_not_zeroed = ext4_has_uninit_itable(sb);
		ext4_register_li_request(sb, first_not_zeroed);
	}

4846
	ext4_setup_system_zone(sb);
4847
	if (sbi->s_journal == NULL && !(old_sb_flags & MS_RDONLY))
4848
		ext4_commit_super(sb, 1);
4849

4850 4851
#ifdef CONFIG_QUOTA
	/* Release old quota file names */
Jan Kara's avatar
Jan Kara committed
4852
	for (i = 0; i < EXT4_MAXQUOTAS; i++)
4853
		kfree(old_opts.s_qf_names[i]);
4854 4855 4856
	if (enable_quota) {
		if (sb_any_quota_suspended(sb))
			dquot_resume(sb, -1);
4857
		else if (ext4_has_feature_quota(sb)) {
4858
			err = ext4_enable_quotas(sb);
4859
			if (err)
4860 4861 4862
				goto restore_opts;
		}
	}
4863
#endif
4864

4865
	*flags = (*flags & ~MS_LAZYTIME) | (sb->s_flags & MS_LAZYTIME);
4866 4867
	ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s", orig_data);
	kfree(orig_data);
4868
	return 0;
4869

4870 4871 4872
restore_opts:
	sb->s_flags = old_sb_flags;
	sbi->s_mount_opt = old_opts.s_mount_opt;
4873
	sbi->s_mount_opt2 = old_opts.s_mount_opt2;
4874 4875 4876
	sbi->s_resuid = old_opts.s_resuid;
	sbi->s_resgid = old_opts.s_resgid;
	sbi->s_commit_interval = old_opts.s_commit_interval;
4877 4878
	sbi->s_min_batch_time = old_opts.s_min_batch_time;
	sbi->s_max_batch_time = old_opts.s_max_batch_time;
4879 4880
#ifdef CONFIG_QUOTA
	sbi->s_jquota_fmt = old_opts.s_jquota_fmt;
Jan Kara's avatar
Jan Kara committed
4881
	for (i = 0; i < EXT4_MAXQUOTAS; i++) {
4882
		kfree(sbi->s_qf_names[i]);
4883 4884 4885
		sbi->s_qf_names[i] = old_opts.s_qf_names[i];
	}
#endif
4886
	kfree(orig_data);
4887 4888 4889
	return err;
}

4890
static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
4891 4892
{
	struct super_block *sb = dentry->d_sb;
4893 4894
	struct ext4_sb_info *sbi = EXT4_SB(sb);
	struct ext4_super_block *es = sbi->s_es;
4895
	ext4_fsblk_t overhead = 0, resv_blocks;
4896
	u64 fsid;
4897
	s64 bfree;
4898
	resv_blocks = EXT4_C2B(sbi, atomic64_read(&sbi->s_resv_clusters));
4899

4900 4901
	if (!test_opt(sb, MINIX_DF))
		overhead = sbi->s_overhead;
4902

4903
	buf->f_type = EXT4_SUPER_MAGIC;
4904
	buf->f_bsize = sb->s_blocksize;
4905
	buf->f_blocks = ext4_blocks_count(es) - EXT4_C2B(sbi, overhead);
4906 4907
	bfree = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) -
		percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter);
4908
	/* prevent underflow in case that few free space is available */
4909
	buf->f_bfree = EXT4_C2B(sbi, max_t(s64, bfree, 0));
4910 4911 4912
	buf->f_bavail = buf->f_bfree -
			(ext4_r_blocks_count(es) + resv_blocks);
	if (buf->f_bfree < (ext4_r_blocks_count(es) + resv_blocks))
4913 4914
		buf->f_bavail = 0;
	buf->f_files = le32_to_cpu(es->s_inodes_count);
4915
	buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter);
4916
	buf->f_namelen = EXT4_NAME_LEN;
4917 4918 4919 4920
	fsid = le64_to_cpup((void *)es->s_uuid) ^
	       le64_to_cpup((void *)es->s_uuid + sizeof(u64));
	buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
	buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
4921

4922 4923 4924
	return 0;
}

4925 4926
/* Helper function for writing quotas on sync - we need to start transaction
 * before quota file is locked for write. Otherwise the are possible deadlocks:
4927
 * Process 1                         Process 2
4928
 * ext4_create()                     quota_sync()
4929
 *   jbd2_journal_start()                  write_dquot()
4930
 *   dquot_initialize()                         down(dqio_mutex)
4931
 *     down(dqio_mutex)                    jbd2_journal_start()
4932 4933 4934 4935 4936 4937 4938
 *
 */

#ifdef CONFIG_QUOTA

static inline struct inode *dquot_to_inode(struct dquot *dquot)
{
4939
	return sb_dqopt(dquot->dq_sb)->files[dquot->dq_id.type];
4940 4941
}

4942
static int ext4_write_dquot(struct dquot *dquot)
4943 4944 4945 4946 4947 4948
{
	int ret, err;
	handle_t *handle;
	struct inode *inode;

	inode = dquot_to_inode(dquot);
4949
	handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
4950
				    EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
4951 4952 4953
	if (IS_ERR(handle))
		return PTR_ERR(handle);
	ret = dquot_commit(dquot);
4954
	err = ext4_journal_stop(handle);
4955 4956 4957 4958 4959
	if (!ret)
		ret = err;
	return ret;
}

4960
static int ext4_acquire_dquot(struct dquot *dquot)
4961 4962 4963 4964
{
	int ret, err;
	handle_t *handle;

4965
	handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
4966
				    EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb));
4967 4968 4969
	if (IS_ERR(handle))
		return PTR_ERR(handle);
	ret = dquot_acquire(dquot);
4970
	err = ext4_journal_stop(handle);
4971 4972 4973 4974 4975
	if (!ret)
		ret = err;
	return ret;
}

4976
static int ext4_release_dquot(struct dquot *dquot)
4977 4978 4979 4980
{
	int ret, err;
	handle_t *handle;

4981
	handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA,
4982
				    EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb));
Jan Kara's avatar
Jan Kara committed
4983 4984 4985
	if (IS_ERR(handle)) {
		/* Release dquot anyway to avoid endless cycle in dqput() */
		dquot_release(dquot);
4986
		return PTR_ERR(handle);
Jan Kara's avatar
Jan Kara committed
4987
	}
4988
	ret = dquot_release(dquot);
4989
	err = ext4_journal_stop(handle);
4990 4991 4992 4993 4994
	if (!ret)
		ret = err;
	return ret;
}

4995
static int ext4_mark_dquot_dirty(struct dquot *dquot)
4996
{
4997 4998 4999
	struct super_block *sb = dquot->dq_sb;
	struct ext4_sb_info *sbi = EXT4_SB(sb);

5000
	/* Are we journaling quotas? */
5001
	if (ext4_has_feature_quota(sb) ||
5002
	    sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) {
5003
		dquot_mark_dquot_dirty(dquot);
5004
		return ext4_write_dquot(dquot);
5005 5006 5007 5008 5009
	} else {
		return dquot_mark_dquot_dirty(dquot);
	}
}

5010
static int ext4_write_info(struct super_block *sb, int type)
5011 5012 5013 5014 5015
{
	int ret, err;
	handle_t *handle;

	/* Data block + inode block */
5016
	handle = ext4_journal_start(d_inode(sb->s_root), EXT4_HT_QUOTA, 2);
5017 5018 5019
	if (IS_ERR(handle))
		return PTR_ERR(handle);
	ret = dquot_commit_info(sb, type);
5020
	err = ext4_journal_stop(handle);
5021 5022 5023 5024 5025 5026 5027 5028 5029
	if (!ret)
		ret = err;
	return ret;
}

/*
 * Turn on quotas during mount time - we need to find
 * the quota file and such...
 */
5030
static int ext4_quota_on_mount(struct super_block *sb, int type)
5031
{
5032 5033
	return dquot_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type],
					EXT4_SB(sb)->s_jquota_fmt, type);
5034 5035
}

5036 5037 5038 5039 5040 5041 5042 5043 5044 5045 5046 5047 5048 5049
static void lockdep_set_quota_inode(struct inode *inode, int subclass)
{
	struct ext4_inode_info *ei = EXT4_I(inode);

	/* The first argument of lockdep_set_subclass has to be
	 * *exactly* the same as the argument to init_rwsem() --- in
	 * this case, in init_once() --- or lockdep gets unhappy
	 * because the name of the lock is set using the
	 * stringification of the argument to init_rwsem().
	 */
	(void) ei;	/* shut up clang warning if !CONFIG_LOCKDEP */
	lockdep_set_subclass(&ei->i_data_sem, subclass);
}

5050 5051 5052
/*
 * Standard function to be called on quota_on
 */
5053
static int ext4_quota_on(struct super_block *sb, int type, int format_id,
5054
			 struct path *path)
5055 5056 5057 5058 5059
{
	int err;

	if (!test_opt(sb, QUOTA))
		return -EINVAL;
5060

5061
	/* Quotafile not on the same filesystem? */
5062
	if (path->dentry->d_sb != sb)
5063
		return -EXDEV;
5064 5065
	/* Journaling quota? */
	if (EXT4_SB(sb)->s_qf_names[type]) {
5066
		/* Quotafile not in fs root? */
5067
		if (path->dentry->d_parent != sb->s_root)
5068 5069 5070
			ext4_msg(sb, KERN_WARNING,
				"Quota file not on filesystem root. "
				"Journaled quota will not work");
5071
	}
5072 5073 5074 5075 5076

	/*
	 * When we journal data on quota file, we have to flush journal to see
	 * all updates to the file when we bypass pagecache...
	 */
5077
	if (EXT4_SB(sb)->s_journal &&
5078
	    ext4_should_journal_data(d_inode(path->dentry))) {
5079 5080 5081 5082 5083
		/*
		 * We don't need to lock updates but journal_flush() could
		 * otherwise be livelocked...
		 */
		jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
5084
		err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
5085
		jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
5086
		if (err)
5087
			return err;
5088
	}
5089 5090 5091 5092 5093 5094
	lockdep_set_quota_inode(path->dentry->d_inode, I_DATA_SEM_QUOTA);
	err = dquot_quota_on(sb, type, format_id, path);
	if (err)
		lockdep_set_quota_inode(path->dentry->d_inode,
					     I_DATA_SEM_NORMAL);
	return err;
5095 5096
}

5097 5098 5099 5100 5101
static int ext4_quota_enable(struct super_block *sb, int type, int format_id,
			     unsigned int flags)
{
	int err;
	struct inode *qf_inode;
Jan Kara's avatar
Jan Kara committed
5102
	unsigned long qf_inums[EXT4_MAXQUOTAS] = {
5103 5104 5105 5106
		le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
		le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum)
	};

5107
	BUG_ON(!ext4_has_feature_quota(sb));
5108 5109 5110 5111 5112 5113 5114 5115 5116 5117

	if (!qf_inums[type])
		return -EPERM;

	qf_inode = ext4_iget(sb, qf_inums[type]);
	if (IS_ERR(qf_inode)) {
		ext4_error(sb, "Bad quota inode # %lu", qf_inums[type]);
		return PTR_ERR(qf_inode);
	}

5118 5119
	/* Don't account quota for quota files to avoid recursion */
	qf_inode->i_flags |= S_NOQUOTA;
5120
	lockdep_set_quota_inode(qf_inode, I_DATA_SEM_QUOTA);
5121 5122
	err = dquot_enable(qf_inode, type, format_id, flags);
	iput(qf_inode);
5123 5124
	if (err)
		lockdep_set_quota_inode(qf_inode, I_DATA_SEM_NORMAL);
5125 5126 5127 5128 5129 5130 5131 5132

	return err;
}

/* Enable usage tracking for all quota types. */
static int ext4_enable_quotas(struct super_block *sb)
{
	int type, err = 0;
Jan Kara's avatar
Jan Kara committed
5133
	unsigned long qf_inums[EXT4_MAXQUOTAS] = {
5134 5135 5136 5137 5138
		le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum),
		le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum)
	};

	sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE;
Jan Kara's avatar
Jan Kara committed
5139
	for (type = 0; type < EXT4_MAXQUOTAS; type++) {
5140 5141 5142 5143
		if (qf_inums[type]) {
			err = ext4_quota_enable(sb, type, QFMT_VFS_V1,
						DQUOT_USAGE_ENABLED);
			if (err) {
5144 5145 5146
				for (type--; type >= 0; type--)
					dquot_quota_off(sb, type);

5147
				ext4_warning(sb,
5148 5149 5150
					"Failed to enable quota tracking "
					"(type=%d, err=%d). Please run "
					"e2fsck to fix.", type, err);
5151 5152 5153 5154 5155 5156 5157
				return err;
			}
		}
	}
	return 0;
}

5158 5159
static int ext4_quota_off(struct super_block *sb, int type)
{
5160 5161 5162
	struct inode *inode = sb_dqopt(sb)->files[type];
	handle_t *handle;

5163 5164 5165
	/* Force all delayed allocation blocks to be allocated.
	 * Caller already holds s_umount sem */
	if (test_opt(sb, DELALLOC))
5166 5167
		sync_filesystem(sb);

5168 5169 5170
	if (!inode)
		goto out;

5171 5172
	/* Update modification times of quota files when userspace can
	 * start looking at them */
5173
	handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1);
5174 5175 5176 5177 5178 5179 5180
	if (IS_ERR(handle))
		goto out;
	inode->i_mtime = inode->i_ctime = CURRENT_TIME;
	ext4_mark_inode_dirty(handle, inode);
	ext4_journal_stop(handle);

out:
5181 5182 5183
	return dquot_quota_off(sb, type);
}

5184 5185
/* Read data from quotafile - avoid pagecache and such because we cannot afford
 * acquiring the locks... As quota files are never truncated and quota code
Lucas De Marchi's avatar
Lucas De Marchi committed
5186
 * itself serializes the operations (and no one else should touch the files)
5187
 * we don't have to be afraid of races */
5188
static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data,
5189 5190 5191
			       size_t len, loff_t off)
{
	struct inode *inode = sb_dqopt(sb)->files[type];
5192
	ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
5193 5194 5195 5196 5197 5198 5199 5200 5201 5202 5203 5204 5205 5206
	int offset = off & (sb->s_blocksize - 1);
	int tocopy;
	size_t toread;
	struct buffer_head *bh;
	loff_t i_size = i_size_read(inode);

	if (off > i_size)
		return 0;
	if (off+len > i_size)
		len = i_size-off;
	toread = len;
	while (toread > 0) {
		tocopy = sb->s_blocksize - offset < toread ?
				sb->s_blocksize - offset : toread;
5207 5208 5209
		bh = ext4_bread(NULL, inode, blk, 0);
		if (IS_ERR(bh))
			return PTR_ERR(bh);
5210 5211 5212 5213 5214 5215 5216 5217 5218 5219 5220 5221 5222 5223 5224
		if (!bh)	/* A hole? */
			memset(data, 0, tocopy);
		else
			memcpy(data, bh->b_data+offset, tocopy);
		brelse(bh);
		offset = 0;
		toread -= tocopy;
		data += tocopy;
		blk++;
	}
	return len;
}

/* Write to quotafile (we know the transaction is already started and has
 * enough credits) */
5225
static ssize_t ext4_quota_write(struct super_block *sb, int type,
5226 5227 5228
				const char *data, size_t len, loff_t off)
{
	struct inode *inode = sb_dqopt(sb)->files[type];
5229
	ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb);
5230
	int err, offset = off & (sb->s_blocksize - 1);
5231
	int retries = 0;
5232 5233 5234
	struct buffer_head *bh;
	handle_t *handle = journal_current_handle();

5235
	if (EXT4_SB(sb)->s_journal && !handle) {
5236 5237
		ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
			" cancelled because transaction is not started",
Jan Kara's avatar
Jan Kara committed
5238 5239 5240
			(unsigned long long)off, (unsigned long long)len);
		return -EIO;
	}
5241 5242 5243 5244 5245 5246 5247 5248 5249 5250 5251
	/*
	 * Since we account only one data block in transaction credits,
	 * then it is impossible to cross a block boundary.
	 */
	if (sb->s_blocksize - offset < len) {
		ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)"
			" cancelled because not block aligned",
			(unsigned long long)off, (unsigned long long)len);
		return -EIO;
	}

5252 5253 5254 5255 5256 5257
	do {
		bh = ext4_bread(handle, inode, blk,
				EXT4_GET_BLOCKS_CREATE |
				EXT4_GET_BLOCKS_METADATA_NOFAIL);
	} while (IS_ERR(bh) && (PTR_ERR(bh) == -ENOSPC) &&
		 ext4_should_retry_alloc(inode->i_sb, &retries));
5258 5259
	if (IS_ERR(bh))
		return PTR_ERR(bh);
5260 5261
	if (!bh)
		goto out;
5262
	BUFFER_TRACE(bh, "get write access");
5263 5264 5265
	err = ext4_journal_get_write_access(handle, bh);
	if (err) {
		brelse(bh);
5266
		return err;
5267
	}
5268 5269 5270 5271
	lock_buffer(bh);
	memcpy(bh->b_data+offset, data, len);
	flush_dcache_page(bh->b_page);
	unlock_buffer(bh);
5272
	err = ext4_handle_dirty_metadata(handle, NULL, bh);
5273
	brelse(bh);
5274
out:
5275 5276
	if (inode->i_size < off + len) {
		i_size_write(inode, off + len);
5277
		EXT4_I(inode)->i_disksize = inode->i_size;
5278
		ext4_mark_inode_dirty(handle, inode);
5279
	}
5280
	return len;
5281 5282 5283 5284
}

#endif

Al Viro's avatar
Al Viro committed
5285 5286
static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags,
		       const char *dev_name, void *data)
5287
{
Al Viro's avatar
Al Viro committed
5288
	return mount_bdev(fs_type, flags, dev_name, data, ext4_fill_super);
5289 5290
}

5291
#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT2)
5292 5293 5294 5295 5296 5297 5298 5299 5300 5301 5302 5303
static inline void register_as_ext2(void)
{
	int err = register_filesystem(&ext2_fs_type);
	if (err)
		printk(KERN_WARNING
		       "EXT4-fs: Unable to register as ext2 (%d)\n", err);
}

static inline void unregister_as_ext2(void)
{
	unregister_filesystem(&ext2_fs_type);
}
5304 5305 5306

static inline int ext2_feature_set_ok(struct super_block *sb)
{
5307
	if (ext4_has_unknown_ext2_incompat_features(sb))
5308 5309 5310
		return 0;
	if (sb->s_flags & MS_RDONLY)
		return 1;
5311
	if (ext4_has_unknown_ext2_ro_compat_features(sb))
5312 5313 5314
		return 0;
	return 1;
}
5315 5316 5317
#else
static inline void register_as_ext2(void) { }
static inline void unregister_as_ext2(void) { }
5318
static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; }
5319 5320 5321 5322 5323 5324 5325 5326 5327 5328 5329 5330 5331 5332
#endif

static inline void register_as_ext3(void)
{
	int err = register_filesystem(&ext3_fs_type);
	if (err)
		printk(KERN_WARNING
		       "EXT4-fs: Unable to register as ext3 (%d)\n", err);
}

static inline void unregister_as_ext3(void)
{
	unregister_filesystem(&ext3_fs_type);
}
5333 5334 5335

static inline int ext3_feature_set_ok(struct super_block *sb)
{
5336
	if (ext4_has_unknown_ext3_incompat_features(sb))
5337
		return 0;
5338
	if (!ext4_has_feature_journal(sb))
5339 5340 5341
		return 0;
	if (sb->s_flags & MS_RDONLY)
		return 1;
5342
	if (ext4_has_unknown_ext3_ro_compat_features(sb))
5343 5344 5345
		return 0;
	return 1;
}
5346

Theodore Ts'o's avatar
Theodore Ts'o committed
5347 5348 5349
static struct file_system_type ext4_fs_type = {
	.owner		= THIS_MODULE,
	.name		= "ext4",
Al Viro's avatar
Al Viro committed
5350
	.mount		= ext4_mount,
Theodore Ts'o's avatar
Theodore Ts'o committed
5351 5352 5353
	.kill_sb	= kill_block_super,
	.fs_flags	= FS_REQUIRES_DEV,
};
5354
MODULE_ALIAS_FS("ext4");
Theodore Ts'o's avatar
Theodore Ts'o committed
5355

5356 5357 5358 5359
/* Shared across all ext4 file systems */
wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ];

5360
static int __init ext4_init_fs(void)
5361
{
5362
	int i, err;
5363

5364
	ratelimit_state_init(&ext4_mount_msg_ratelimit, 30 * HZ, 64);
5365 5366 5367
	ext4_li_info = NULL;
	mutex_init(&ext4_li_mtx);

5368
	/* Build-time check for flags consistency */
5369
	ext4_check_flag_values();
5370 5371 5372 5373 5374 5375

	for (i = 0; i < EXT4_WQ_HASH_SZ; i++) {
		mutex_init(&ext4__aio_mutex[i]);
		init_waitqueue_head(&ext4__ioend_wq[i]);
	}

5376
	err = ext4_init_es();
5377 5378
	if (err)
		return err;
5379 5380 5381

	err = ext4_init_pageio();
	if (err)
5382
		goto out5;
5383

5384
	err = ext4_init_system_zone();
5385
	if (err)
5386
		goto out4;
5387

5388
	err = ext4_init_sysfs();
5389
	if (err)
5390
		goto out3;
5391

5392
	err = ext4_init_mballoc();
5393 5394
	if (err)
		goto out2;
5395 5396
	else
		ext4_mballoc_ready = 1;
5397 5398 5399
	err = init_inodecache();
	if (err)
		goto out1;
5400
	register_as_ext3();
5401
	register_as_ext2();
Theodore Ts'o's avatar
Theodore Ts'o committed
5402
	err = register_filesystem(&ext4_fs_type);
5403 5404
	if (err)
		goto out;
5405

5406 5407
	return 0;
out:
5408 5409
	unregister_as_ext2();
	unregister_as_ext3();
5410 5411
	destroy_inodecache();
out1:
5412
	ext4_mballoc_ready = 0;
5413
	ext4_exit_mballoc();
5414
out2:
5415 5416
	ext4_exit_sysfs();
out3:
5417
	ext4_exit_system_zone();
5418
out4:
5419
	ext4_exit_pageio();
5420
out5:
5421 5422
	ext4_exit_es();

5423 5424 5425
	return err;
}

5426
static void __exit ext4_exit_fs(void)
5427
{
5428
	ext4_exit_crypto();
5429
	ext4_destroy_lazyinit_thread();
5430 5431
	unregister_as_ext2();
	unregister_as_ext3();
Theodore Ts'o's avatar
Theodore Ts'o committed
5432
	unregister_filesystem(&ext4_fs_type);
5433
	destroy_inodecache();
5434
	ext4_exit_mballoc();
5435
	ext4_exit_sysfs();
5436 5437
	ext4_exit_system_zone();
	ext4_exit_pageio();
5438
	ext4_exit_es();
5439 5440 5441
}

MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others");
5442
MODULE_DESCRIPTION("Fourth Extended Filesystem");
5443
MODULE_LICENSE("GPL");
5444 5445
module_init(ext4_init_fs)
module_exit(ext4_exit_fs)