disk-io.c 117.6 KB
Newer Older
C
Chris Mason 已提交
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
/*
 * Copyright (C) 2007 Oracle.  All rights reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public
 * License v2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public
 * License along with this program; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 021110-1307, USA.
 */

C
Chris Mason 已提交
19
#include <linux/fs.h>
20
#include <linux/blkdev.h>
C
Chris Mason 已提交
21
#include <linux/scatterlist.h>
C
Chris Mason 已提交
22
#include <linux/swap.h>
23
#include <linux/radix-tree.h>
C
Chris Mason 已提交
24
#include <linux/writeback.h>
C
Chris Mason 已提交
25
#include <linux/buffer_head.h>
26
#include <linux/workqueue.h>
27
#include <linux/kthread.h>
C
Chris Mason 已提交
28
#include <linux/freezer.h>
29
#include <linux/slab.h>
30
#include <linux/migrate.h>
31
#include <linux/ratelimit.h>
32
#include <linux/uuid.h>
S
Stefan Behrens 已提交
33
#include <linux/semaphore.h>
34
#include <asm/unaligned.h>
35 36
#include "ctree.h"
#include "disk-io.h"
37
#include "hash.h"
38
#include "transaction.h"
39
#include "btrfs_inode.h"
40
#include "volumes.h"
41
#include "print-tree.h"
42
#include "locking.h"
43
#include "tree-log.h"
44
#include "free-space-cache.h"
45
#include "inode-map.h"
46
#include "check-integrity.h"
47
#include "rcu-string.h"
48
#include "dev-replace.h"
D
David Woodhouse 已提交
49
#include "raid56.h"
50
#include "sysfs.h"
J
Josef Bacik 已提交
51
#include "qgroup.h"
52

53 54 55 56
#ifdef CONFIG_X86
#include <asm/cpufeature.h>
#endif

57
static const struct extent_io_ops btree_extent_io_ops;
58
static void end_workqueue_fn(struct btrfs_work *work);
59
static void free_fs_root(struct btrfs_root *root);
60
static int btrfs_check_super_valid(struct btrfs_fs_info *fs_info,
L
liubo 已提交
61
				    int read_only);
62
static void btrfs_destroy_ordered_extents(struct btrfs_root *root);
L
liubo 已提交
63 64
static int btrfs_destroy_delayed_refs(struct btrfs_transaction *trans,
				      struct btrfs_root *root);
65
static void btrfs_destroy_delalloc_inodes(struct btrfs_root *root);
L
liubo 已提交
66 67 68 69 70
static int btrfs_destroy_marked_extents(struct btrfs_root *root,
					struct extent_io_tree *dirty_pages,
					int mark);
static int btrfs_destroy_pinned_extent(struct btrfs_root *root,
				       struct extent_io_tree *pinned_extents);
71 72
static int btrfs_cleanup_transaction(struct btrfs_root *root);
static void btrfs_error_commit_super(struct btrfs_root *root);
73

C
Chris Mason 已提交
74
/*
75 76
 * btrfs_end_io_wq structs are used to do processing in task context when an IO
 * is complete.  This is used during reads to verify checksums, and it is used
C
Chris Mason 已提交
77 78
 * by writes to insert metadata for new file extents after IO is complete.
 */
79
struct btrfs_end_io_wq {
80 81 82 83 84
	struct bio *bio;
	bio_end_io_t *end_io;
	void *private;
	struct btrfs_fs_info *info;
	int error;
85
	enum btrfs_wq_endio_type metadata;
86
	struct list_head list;
87
	struct btrfs_work work;
88
};
89

90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109
static struct kmem_cache *btrfs_end_io_wq_cache;

int __init btrfs_end_io_wq_init(void)
{
	btrfs_end_io_wq_cache = kmem_cache_create("btrfs_end_io_wq",
					sizeof(struct btrfs_end_io_wq),
					0,
					SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD,
					NULL);
	if (!btrfs_end_io_wq_cache)
		return -ENOMEM;
	return 0;
}

void btrfs_end_io_wq_exit(void)
{
	if (btrfs_end_io_wq_cache)
		kmem_cache_destroy(btrfs_end_io_wq_cache);
}

C
Chris Mason 已提交
110 111 112 113 114
/*
 * async submit bios are used to offload expensive checksumming
 * onto the worker threads.  They checksum file and metadata bios
 * just before they are sent down the IO stack.
 */
115 116 117 118
struct async_submit_bio {
	struct inode *inode;
	struct bio *bio;
	struct list_head list;
C
Chris Mason 已提交
119 120
	extent_submit_bio_hook_t *submit_bio_start;
	extent_submit_bio_hook_t *submit_bio_done;
121 122
	int rw;
	int mirror_num;
C
Chris Mason 已提交
123
	unsigned long bio_flags;
124 125 126 127 128
	/*
	 * bio_offset is optional, can be used if the pages in the bio
	 * can't tell us where in the file the bio should go
	 */
	u64 bio_offset;
129
	struct btrfs_work work;
130
	int error;
131 132
};

133 134 135 136 137 138 139 140 141 142
/*
 * Lockdep class keys for extent_buffer->lock's in this root.  For a given
 * eb, the lockdep key is determined by the btrfs_root it belongs to and
 * the level the eb occupies in the tree.
 *
 * Different roots are used for different purposes and may nest inside each
 * other and they require separate keysets.  As lockdep keys should be
 * static, assign keysets according to the purpose of the root as indicated
 * by btrfs_root->objectid.  This ensures that all special purpose roots
 * have separate keysets.
143
 *
144 145 146
 * Lock-nesting across peer nodes is always done with the immediate parent
 * node locked thus preventing deadlock.  As lockdep doesn't know this, use
 * subclass to avoid triggering lockdep warning in such cases.
147
 *
148 149 150
 * The key is set by the readpage_end_io_hook after the buffer has passed
 * csum validation but before the pages are unlocked.  It is also set by
 * btrfs_init_new_buffer on freshly allocated blocks.
151
 *
152 153 154
 * We also add a check to make sure the highest level of the tree is the
 * same as our lockdep setup here.  If BTRFS_MAX_LEVEL changes, this code
 * needs update as well.
155 156 157 158 159
 */
#ifdef CONFIG_DEBUG_LOCK_ALLOC
# if BTRFS_MAX_LEVEL != 8
#  error
# endif
160 161 162 163 164 165 166 167 168 169 170 171 172

static struct btrfs_lockdep_keyset {
	u64			id;		/* root objectid */
	const char		*name_stem;	/* lock name stem */
	char			names[BTRFS_MAX_LEVEL + 1][20];
	struct lock_class_key	keys[BTRFS_MAX_LEVEL + 1];
} btrfs_lockdep_keysets[] = {
	{ .id = BTRFS_ROOT_TREE_OBJECTID,	.name_stem = "root"	},
	{ .id = BTRFS_EXTENT_TREE_OBJECTID,	.name_stem = "extent"	},
	{ .id = BTRFS_CHUNK_TREE_OBJECTID,	.name_stem = "chunk"	},
	{ .id = BTRFS_DEV_TREE_OBJECTID,	.name_stem = "dev"	},
	{ .id = BTRFS_FS_TREE_OBJECTID,		.name_stem = "fs"	},
	{ .id = BTRFS_CSUM_TREE_OBJECTID,	.name_stem = "csum"	},
173
	{ .id = BTRFS_QUOTA_TREE_OBJECTID,	.name_stem = "quota"	},
174 175 176
	{ .id = BTRFS_TREE_LOG_OBJECTID,	.name_stem = "log"	},
	{ .id = BTRFS_TREE_RELOC_OBJECTID,	.name_stem = "treloc"	},
	{ .id = BTRFS_DATA_RELOC_TREE_OBJECTID,	.name_stem = "dreloc"	},
177
	{ .id = BTRFS_UUID_TREE_OBJECTID,	.name_stem = "uuid"	},
178
	{ .id = 0,				.name_stem = "tree"	},
179
};
180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210

void __init btrfs_init_lockdep(void)
{
	int i, j;

	/* initialize lockdep class names */
	for (i = 0; i < ARRAY_SIZE(btrfs_lockdep_keysets); i++) {
		struct btrfs_lockdep_keyset *ks = &btrfs_lockdep_keysets[i];

		for (j = 0; j < ARRAY_SIZE(ks->names); j++)
			snprintf(ks->names[j], sizeof(ks->names[j]),
				 "btrfs-%s-%02d", ks->name_stem, j);
	}
}

void btrfs_set_buffer_lockdep_class(u64 objectid, struct extent_buffer *eb,
				    int level)
{
	struct btrfs_lockdep_keyset *ks;

	BUG_ON(level >= ARRAY_SIZE(ks->keys));

	/* find the matching keyset, id 0 is the default entry */
	for (ks = btrfs_lockdep_keysets; ks->id; ks++)
		if (ks->id == objectid)
			break;

	lockdep_set_class_and_name(&eb->lock,
				   &ks->keys[level], ks->names[level]);
}

211 212
#endif

C
Chris Mason 已提交
213 214 215 216
/*
 * extents on the btree inode are pretty simple, there's one extent
 * that covers the entire device
 */
217
static struct extent_map *btree_get_extent(struct inode *inode,
218
		struct page *page, size_t pg_offset, u64 start, u64 len,
219
		int create)
220
{
221 222 223 224
	struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
	struct extent_map *em;
	int ret;

225
	read_lock(&em_tree->lock);
226
	em = lookup_extent_mapping(em_tree, start, len);
227 228 229
	if (em) {
		em->bdev =
			BTRFS_I(inode)->root->fs_info->fs_devices->latest_bdev;
230
		read_unlock(&em_tree->lock);
231
		goto out;
232
	}
233
	read_unlock(&em_tree->lock);
234

235
	em = alloc_extent_map();
236 237 238 239 240
	if (!em) {
		em = ERR_PTR(-ENOMEM);
		goto out;
	}
	em->start = 0;
241
	em->len = (u64)-1;
C
Chris Mason 已提交
242
	em->block_len = (u64)-1;
243
	em->block_start = 0;
244
	em->bdev = BTRFS_I(inode)->root->fs_info->fs_devices->latest_bdev;
245

246
	write_lock(&em_tree->lock);
J
Josef Bacik 已提交
247
	ret = add_extent_mapping(em_tree, em, 0);
248 249
	if (ret == -EEXIST) {
		free_extent_map(em);
250
		em = lookup_extent_mapping(em_tree, start, len);
251
		if (!em)
252
			em = ERR_PTR(-EIO);
253
	} else if (ret) {
254
		free_extent_map(em);
255
		em = ERR_PTR(ret);
256
	}
257
	write_unlock(&em_tree->lock);
258

259 260
out:
	return em;
261 262
}

263
u32 btrfs_csum_data(char *data, u32 seed, size_t len)
264
{
265
	return btrfs_crc32c(seed, data, len);
266 267 268 269
}

void btrfs_csum_final(u32 crc, char *result)
{
270
	put_unaligned_le32(~crc, result);
271 272
}

C
Chris Mason 已提交
273 274 275 276
/*
 * compute the csum for a btree block, and either verify it or write it
 * into the csum field of the block.
 */
277 278
static int csum_tree_block(struct btrfs_fs_info *fs_info,
			   struct extent_buffer *buf,
279 280
			   int verify)
{
281
	u16 csum_size = btrfs_super_csum_size(fs_info->super_copy);
282
	char *result = NULL;
283 284 285 286 287 288 289 290
	unsigned long len;
	unsigned long cur_len;
	unsigned long offset = BTRFS_CSUM_SIZE;
	char *kaddr;
	unsigned long map_start;
	unsigned long map_len;
	int err;
	u32 crc = ~(u32)0;
291
	unsigned long inline_result;
292 293

	len = buf->len - offset;
C
Chris Mason 已提交
294
	while (len > 0) {
295
		err = map_private_extent_buffer(buf, offset, 32,
296
					&kaddr, &map_start, &map_len);
C
Chris Mason 已提交
297
		if (err)
298 299
			return 1;
		cur_len = min(len, map_len - (offset - map_start));
300
		crc = btrfs_csum_data(kaddr + offset - map_start,
301 302 303 304
				      crc, cur_len);
		len -= cur_len;
		offset += cur_len;
	}
305
	if (csum_size > sizeof(inline_result)) {
306
		result = kzalloc(csum_size, GFP_NOFS);
307 308 309 310 311 312
		if (!result)
			return 1;
	} else {
		result = (char *)&inline_result;
	}

313 314 315
	btrfs_csum_final(crc, result);

	if (verify) {
316
		if (memcmp_extent_buffer(buf, result, 0, csum_size)) {
317 318
			u32 val;
			u32 found = 0;
319
			memcpy(&found, result, csum_size);
320

321
			read_extent_buffer(buf, &val, 0, csum_size);
322
			printk_ratelimited(KERN_WARNING
323 324
				"BTRFS: %s checksum verify failed on %llu wanted %X found %X "
				"level %d\n",
325
				fs_info->sb->s_id, buf->start,
326
				val, found, btrfs_header_level(buf));
327 328
			if (result != (char *)&inline_result)
				kfree(result);
329 330 331
			return 1;
		}
	} else {
332
		write_extent_buffer(buf, result, 0, csum_size);
333
	}
334 335
	if (result != (char *)&inline_result)
		kfree(result);
336 337 338
	return 0;
}

C
Chris Mason 已提交
339 340 341 342 343 344
/*
 * we can't consider a given block up to date unless the transid of the
 * block matches the transid in the parent node's pointer.  This is how we
 * detect blocks that either didn't get written at all or got written
 * in the wrong place.
 */
345
static int verify_parent_transid(struct extent_io_tree *io_tree,
346 347
				 struct extent_buffer *eb, u64 parent_transid,
				 int atomic)
348
{
349
	struct extent_state *cached_state = NULL;
350
	int ret;
351
	bool need_lock = (current->journal_info == BTRFS_SEND_TRANS_STUB);
352 353 354 355

	if (!parent_transid || btrfs_header_generation(eb) == parent_transid)
		return 0;

356 357 358
	if (atomic)
		return -EAGAIN;

359 360 361 362 363
	if (need_lock) {
		btrfs_tree_read_lock(eb);
		btrfs_set_lock_blocking_rw(eb, BTRFS_READ_LOCK);
	}

364
	lock_extent_bits(io_tree, eb->start, eb->start + eb->len - 1,
365
			 0, &cached_state);
366
	if (extent_buffer_uptodate(eb) &&
367 368 369 370
	    btrfs_header_generation(eb) == parent_transid) {
		ret = 0;
		goto out;
	}
371 372
	printk_ratelimited(KERN_ERR
	    "BTRFS (device %s): parent transid verify failed on %llu wanted %llu found %llu\n",
373 374
			eb->fs_info->sb->s_id, eb->start,
			parent_transid, btrfs_header_generation(eb));
375
	ret = 1;
376 377 378 379 380 381 382 383 384 385 386

	/*
	 * Things reading via commit roots that don't have normal protection,
	 * like send, can have a really old block in cache that may point at a
	 * block that has been free'd and re-allocated.  So don't clear uptodate
	 * if we find an eb that is under IO (dirty/writeback) because we could
	 * end up reading in the stale data and then writing it back out and
	 * making everybody very sad.
	 */
	if (!extent_buffer_under_io(eb))
		clear_extent_buffer_uptodate(eb);
C
Chris Mason 已提交
387
out:
388 389
	unlock_extent_cached(io_tree, eb->start, eb->start + eb->len - 1,
			     &cached_state, GFP_NOFS);
390 391
	if (need_lock)
		btrfs_tree_read_unlock_blocking(eb);
392 393 394
	return ret;
}

D
David Sterba 已提交
395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424
/*
 * Return 0 if the superblock checksum type matches the checksum value of that
 * algorithm. Pass the raw disk superblock data.
 */
static int btrfs_check_super_csum(char *raw_disk_sb)
{
	struct btrfs_super_block *disk_sb =
		(struct btrfs_super_block *)raw_disk_sb;
	u16 csum_type = btrfs_super_csum_type(disk_sb);
	int ret = 0;

	if (csum_type == BTRFS_CSUM_TYPE_CRC32) {
		u32 crc = ~(u32)0;
		const int csum_size = sizeof(crc);
		char result[csum_size];

		/*
		 * The super_block structure does not span the whole
		 * BTRFS_SUPER_INFO_SIZE range, we expect that the unused space
		 * is filled with zeros and is included in the checkum.
		 */
		crc = btrfs_csum_data(raw_disk_sb + BTRFS_CSUM_SIZE,
				crc, BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
		btrfs_csum_final(crc, result);

		if (memcmp(raw_disk_sb, result, csum_size))
			ret = 1;
	}

	if (csum_type >= ARRAY_SIZE(btrfs_csum_sizes)) {
425
		printk(KERN_ERR "BTRFS: unsupported checksum algorithm %u\n",
D
David Sterba 已提交
426 427 428 429 430 431 432
				csum_type);
		ret = 1;
	}

	return ret;
}

C
Chris Mason 已提交
433 434 435 436
/*
 * helper to read a given tree block, doing retries as required when
 * the checksums don't match and we have alternate mirrors to try.
 */
437 438
static int btree_read_extent_buffer_pages(struct btrfs_root *root,
					  struct extent_buffer *eb,
439
					  u64 start, u64 parent_transid)
440 441
{
	struct extent_io_tree *io_tree;
442
	int failed = 0;
443 444 445
	int ret;
	int num_copies = 0;
	int mirror_num = 0;
446
	int failed_mirror = 0;
447

448
	clear_bit(EXTENT_BUFFER_CORRUPT, &eb->bflags);
449 450
	io_tree = &BTRFS_I(root->fs_info->btree_inode)->io_tree;
	while (1) {
451 452
		ret = read_extent_buffer_pages(io_tree, eb, start,
					       WAIT_COMPLETE,
453
					       btree_get_extent, mirror_num);
454 455
		if (!ret) {
			if (!verify_parent_transid(io_tree, eb,
456
						   parent_transid, 0))
457 458 459 460
				break;
			else
				ret = -EIO;
		}
C
Chris Mason 已提交
461

462 463 464 465 466 467
		/*
		 * This buffer's crc is fine, but its contents are corrupted, so
		 * there is no reason to read the other copies, they won't be
		 * any less wrong.
		 */
		if (test_bit(EXTENT_BUFFER_CORRUPT, &eb->bflags))
468 469
			break;

470
		num_copies = btrfs_num_copies(root->fs_info,
471
					      eb->start, eb->len);
C
Chris Mason 已提交
472
		if (num_copies == 1)
473
			break;
C
Chris Mason 已提交
474

475 476 477 478 479
		if (!failed_mirror) {
			failed = 1;
			failed_mirror = eb->read_mirror;
		}

480
		mirror_num++;
481 482 483
		if (mirror_num == failed_mirror)
			mirror_num++;

C
Chris Mason 已提交
484
		if (mirror_num > num_copies)
485
			break;
486
	}
487

488
	if (failed && !ret && failed_mirror)
489 490 491
		repair_eb_io_failure(root, eb, failed_mirror);

	return ret;
492
}
493

C
Chris Mason 已提交
494
/*
C
Chris Mason 已提交
495 496
 * checksum a dirty tree block before IO.  This has extra checks to make sure
 * we only fill in the checksum field in the first page of a multi-page block
C
Chris Mason 已提交
497
 */
C
Chris Mason 已提交
498

499
static int csum_dirty_buffer(struct btrfs_fs_info *fs_info, struct page *page)
500
{
M
Miao Xie 已提交
501
	u64 start = page_offset(page);
502 503
	u64 found_start;
	struct extent_buffer *eb;
504

J
Josef Bacik 已提交
505 506 507
	eb = (struct extent_buffer *)page->private;
	if (page != eb->pages[0])
		return 0;
508
	found_start = btrfs_header_bytenr(eb);
509
	if (WARN_ON(found_start != start || !PageUptodate(page)))
J
Josef Bacik 已提交
510
		return 0;
511
	csum_tree_block(fs_info, eb, 0);
512 513 514
	return 0;
}

515
static int check_tree_block_fsid(struct btrfs_fs_info *fs_info,
Y
Yan Zheng 已提交
516 517
				 struct extent_buffer *eb)
{
518
	struct btrfs_fs_devices *fs_devices = fs_info->fs_devices;
Y
Yan Zheng 已提交
519 520 521
	u8 fsid[BTRFS_UUID_SIZE];
	int ret = 1;

522
	read_extent_buffer(eb, fsid, btrfs_header_fsid(), BTRFS_FSID_SIZE);
Y
Yan Zheng 已提交
523 524 525 526 527 528 529 530 531 532
	while (fs_devices) {
		if (!memcmp(fsid, fs_devices->fsid, BTRFS_FSID_SIZE)) {
			ret = 0;
			break;
		}
		fs_devices = fs_devices->seed;
	}
	return ret;
}

533
#define CORRUPT(reason, eb, root, slot)				\
534 535
	btrfs_crit(root->fs_info, "corrupt leaf, %s: block=%llu,"	\
		   "root=%llu, slot=%d", reason,			\
536
	       btrfs_header_bytenr(eb),	root->objectid, slot)
537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598

static noinline int check_leaf(struct btrfs_root *root,
			       struct extent_buffer *leaf)
{
	struct btrfs_key key;
	struct btrfs_key leaf_key;
	u32 nritems = btrfs_header_nritems(leaf);
	int slot;

	if (nritems == 0)
		return 0;

	/* Check the 0 item */
	if (btrfs_item_offset_nr(leaf, 0) + btrfs_item_size_nr(leaf, 0) !=
	    BTRFS_LEAF_DATA_SIZE(root)) {
		CORRUPT("invalid item offset size pair", leaf, root, 0);
		return -EIO;
	}

	/*
	 * Check to make sure each items keys are in the correct order and their
	 * offsets make sense.  We only have to loop through nritems-1 because
	 * we check the current slot against the next slot, which verifies the
	 * next slot's offset+size makes sense and that the current's slot
	 * offset is correct.
	 */
	for (slot = 0; slot < nritems - 1; slot++) {
		btrfs_item_key_to_cpu(leaf, &leaf_key, slot);
		btrfs_item_key_to_cpu(leaf, &key, slot + 1);

		/* Make sure the keys are in the right order */
		if (btrfs_comp_cpu_keys(&leaf_key, &key) >= 0) {
			CORRUPT("bad key order", leaf, root, slot);
			return -EIO;
		}

		/*
		 * Make sure the offset and ends are right, remember that the
		 * item data starts at the end of the leaf and grows towards the
		 * front.
		 */
		if (btrfs_item_offset_nr(leaf, slot) !=
			btrfs_item_end_nr(leaf, slot + 1)) {
			CORRUPT("slot offset bad", leaf, root, slot);
			return -EIO;
		}

		/*
		 * Check to make sure that we don't point outside of the leaf,
		 * just incase all the items are consistent to eachother, but
		 * all point outside of the leaf.
		 */
		if (btrfs_item_end_nr(leaf, slot) >
		    BTRFS_LEAF_DATA_SIZE(root)) {
			CORRUPT("slot end outside of leaf", leaf, root, slot);
			return -EIO;
		}
	}

	return 0;
}

599 600 601
static int btree_readpage_end_io_hook(struct btrfs_io_bio *io_bio,
				      u64 phy_offset, struct page *page,
				      u64 start, u64 end, int mirror)
602 603 604 605 606
{
	u64 found_start;
	int found_level;
	struct extent_buffer *eb;
	struct btrfs_root *root = BTRFS_I(page->mapping->host)->root;
607
	int ret = 0;
608
	int reads_done;
609 610 611

	if (!page->private)
		goto out;
C
Chris Mason 已提交
612

J
Josef Bacik 已提交
613
	eb = (struct extent_buffer *)page->private;
C
Chris Mason 已提交
614

615 616 617 618 619 620
	/* the pending IO might have been the only thing that kept this buffer
	 * in memory.  Make sure we have a ref for all this other checks
	 */
	extent_buffer_get(eb);

	reads_done = atomic_dec_and_test(&eb->io_pages);
621 622
	if (!reads_done)
		goto err;
623

624
	eb->read_mirror = mirror;
625
	if (test_bit(EXTENT_BUFFER_READ_ERR, &eb->bflags)) {
626 627 628 629
		ret = -EIO;
		goto err;
	}

630
	found_start = btrfs_header_bytenr(eb);
631
	if (found_start != eb->start) {
632
		printk_ratelimited(KERN_ERR "BTRFS (device %s): bad tree block start "
C
Chris Mason 已提交
633
			       "%llu %llu\n",
634
			       eb->fs_info->sb->s_id, found_start, eb->start);
635
		ret = -EIO;
636 637
		goto err;
	}
638
	if (check_tree_block_fsid(root->fs_info, eb)) {
639
		printk_ratelimited(KERN_ERR "BTRFS (device %s): bad fsid on block %llu\n",
640
			       eb->fs_info->sb->s_id, eb->start);
641 642 643
		ret = -EIO;
		goto err;
	}
644
	found_level = btrfs_header_level(eb);
645
	if (found_level >= BTRFS_MAX_LEVEL) {
646
		btrfs_err(root->fs_info, "bad tree block level %d",
647 648 649 650
			   (int)btrfs_header_level(eb));
		ret = -EIO;
		goto err;
	}
651

652 653
	btrfs_set_buffer_lockdep_class(btrfs_header_owner(eb),
				       eb, found_level);
654

655
	ret = csum_tree_block(root->fs_info, eb, 1);
656
	if (ret) {
657
		ret = -EIO;
658 659 660 661 662 663 664 665 666 667 668 669
		goto err;
	}

	/*
	 * If this is a leaf block and it is corrupt, set the corrupt bit so
	 * that we don't try and read the other copies of this block, just
	 * return -EIO.
	 */
	if (found_level == 0 && check_leaf(root, eb)) {
		set_bit(EXTENT_BUFFER_CORRUPT, &eb->bflags);
		ret = -EIO;
	}
670

671 672
	if (!ret)
		set_extent_buffer_uptodate(eb);
673
err:
674 675
	if (reads_done &&
	    test_and_clear_bit(EXTENT_BUFFER_READAHEAD, &eb->bflags))
A
Arne Jansen 已提交
676 677
		btree_readahead_hook(root, eb, eb->start, ret);

D
David Woodhouse 已提交
678 679 680 681 682 683 684
	if (ret) {
		/*
		 * our io error hook is going to dec the io pages
		 * again, we have to make sure it has something
		 * to decrement
		 */
		atomic_inc(&eb->io_pages);
685
		clear_extent_buffer_uptodate(eb);
D
David Woodhouse 已提交
686
	}
687
	free_extent_buffer(eb);
688
out:
689
	return ret;
690 691
}

692
static int btree_io_failed_hook(struct page *page, int failed_mirror)
A
Arne Jansen 已提交
693 694 695 696
{
	struct extent_buffer *eb;
	struct btrfs_root *root = BTRFS_I(page->mapping->host)->root;

J
Josef Bacik 已提交
697
	eb = (struct extent_buffer *)page->private;
698
	set_bit(EXTENT_BUFFER_READ_ERR, &eb->bflags);
699
	eb->read_mirror = failed_mirror;
D
David Woodhouse 已提交
700
	atomic_dec(&eb->io_pages);
701
	if (test_and_clear_bit(EXTENT_BUFFER_READAHEAD, &eb->bflags))
A
Arne Jansen 已提交
702 703 704 705
		btree_readahead_hook(root, eb, eb->start, -EIO);
	return -EIO;	/* we fixed nothing */
}

706 707
static void end_workqueue_bio(struct bio *bio, int err)
{
708
	struct btrfs_end_io_wq *end_io_wq = bio->bi_private;
709
	struct btrfs_fs_info *fs_info;
710 711
	struct btrfs_workqueue *wq;
	btrfs_work_func_t func;
712 713 714

	fs_info = end_io_wq->info;
	end_io_wq->error = err;
715

716
	if (bio->bi_rw & REQ_WRITE) {
717 718 719 720 721 722 723 724 725 726 727 728 729
		if (end_io_wq->metadata == BTRFS_WQ_ENDIO_METADATA) {
			wq = fs_info->endio_meta_write_workers;
			func = btrfs_endio_meta_write_helper;
		} else if (end_io_wq->metadata == BTRFS_WQ_ENDIO_FREE_SPACE) {
			wq = fs_info->endio_freespace_worker;
			func = btrfs_freespace_write_helper;
		} else if (end_io_wq->metadata == BTRFS_WQ_ENDIO_RAID56) {
			wq = fs_info->endio_raid56_workers;
			func = btrfs_endio_raid56_helper;
		} else {
			wq = fs_info->endio_write_workers;
			func = btrfs_endio_write_helper;
		}
730
	} else {
731 732 733 734 735
		if (unlikely(end_io_wq->metadata ==
			     BTRFS_WQ_ENDIO_DIO_REPAIR)) {
			wq = fs_info->endio_repair_workers;
			func = btrfs_endio_repair_helper;
		} else if (end_io_wq->metadata == BTRFS_WQ_ENDIO_RAID56) {
736 737 738 739 740 741 742 743 744
			wq = fs_info->endio_raid56_workers;
			func = btrfs_endio_raid56_helper;
		} else if (end_io_wq->metadata) {
			wq = fs_info->endio_meta_workers;
			func = btrfs_endio_meta_helper;
		} else {
			wq = fs_info->endio_workers;
			func = btrfs_endio_helper;
		}
745
	}
746 747 748

	btrfs_init_work(&end_io_wq->work, func, end_workqueue_fn, NULL, NULL);
	btrfs_queue_work(wq, &end_io_wq->work);
749 750
}

751
int btrfs_bio_wq_end_io(struct btrfs_fs_info *info, struct bio *bio,
752
			enum btrfs_wq_endio_type metadata)
753
{
754
	struct btrfs_end_io_wq *end_io_wq;
755

756
	end_io_wq = kmem_cache_alloc(btrfs_end_io_wq_cache, GFP_NOFS);
757 758 759 760 761
	if (!end_io_wq)
		return -ENOMEM;

	end_io_wq->private = bio->bi_private;
	end_io_wq->end_io = bio->bi_end_io;
762
	end_io_wq->info = info;
763 764
	end_io_wq->error = 0;
	end_io_wq->bio = bio;
765
	end_io_wq->metadata = metadata;
766 767 768

	bio->bi_private = end_io_wq;
	bio->bi_end_io = end_workqueue_bio;
769 770 771
	return 0;
}

772
unsigned long btrfs_async_submit_limit(struct btrfs_fs_info *info)
773
{
774
	unsigned long limit = min_t(unsigned long,
775
				    info->thread_pool_size,
776 777 778
				    info->fs_devices->open_devices);
	return 256 * limit;
}
779

C
Chris Mason 已提交
780 781 782
static void run_one_async_start(struct btrfs_work *work)
{
	struct async_submit_bio *async;
783
	int ret;
C
Chris Mason 已提交
784 785

	async = container_of(work, struct  async_submit_bio, work);
786 787 788 789 790
	ret = async->submit_bio_start(async->inode, async->rw, async->bio,
				      async->mirror_num, async->bio_flags,
				      async->bio_offset);
	if (ret)
		async->error = ret;
C
Chris Mason 已提交
791 792 793
}

static void run_one_async_done(struct btrfs_work *work)
794 795 796
{
	struct btrfs_fs_info *fs_info;
	struct async_submit_bio *async;
797
	int limit;
798 799 800

	async = container_of(work, struct  async_submit_bio, work);
	fs_info = BTRFS_I(async->inode)->root->fs_info;
801

802
	limit = btrfs_async_submit_limit(fs_info);
803 804
	limit = limit * 2 / 3;

805
	if (atomic_dec_return(&fs_info->nr_async_submits) < limit &&
806
	    waitqueue_active(&fs_info->async_submit_wait))
807 808
		wake_up(&fs_info->async_submit_wait);

809 810 811 812 813 814
	/* If an error occured we just want to clean up the bio and move on */
	if (async->error) {
		bio_endio(async->bio, async->error);
		return;
	}

C
Chris Mason 已提交
815
	async->submit_bio_done(async->inode, async->rw, async->bio,
816 817
			       async->mirror_num, async->bio_flags,
			       async->bio_offset);
C
Chris Mason 已提交
818 819 820 821 822 823 824
}

static void run_one_async_free(struct btrfs_work *work)
{
	struct async_submit_bio *async;

	async = container_of(work, struct  async_submit_bio, work);
825 826 827
	kfree(async);
}

828 829
int btrfs_wq_submit_bio(struct btrfs_fs_info *fs_info, struct inode *inode,
			int rw, struct bio *bio, int mirror_num,
C
Chris Mason 已提交
830
			unsigned long bio_flags,
831
			u64 bio_offset,
C
Chris Mason 已提交
832 833
			extent_submit_bio_hook_t *submit_bio_start,
			extent_submit_bio_hook_t *submit_bio_done)
834 835 836 837 838 839 840 841 842 843 844
{
	struct async_submit_bio *async;

	async = kmalloc(sizeof(*async), GFP_NOFS);
	if (!async)
		return -ENOMEM;

	async->inode = inode;
	async->rw = rw;
	async->bio = bio;
	async->mirror_num = mirror_num;
C
Chris Mason 已提交
845 846 847
	async->submit_bio_start = submit_bio_start;
	async->submit_bio_done = submit_bio_done;

848
	btrfs_init_work(&async->work, btrfs_worker_helper, run_one_async_start,
849
			run_one_async_done, run_one_async_free);
C
Chris Mason 已提交
850

C
Chris Mason 已提交
851
	async->bio_flags = bio_flags;
852
	async->bio_offset = bio_offset;
853

854 855
	async->error = 0;

856
	atomic_inc(&fs_info->nr_async_submits);
857

858
	if (rw & REQ_SYNC)
859
		btrfs_set_work_high_priority(&async->work);
860

861
	btrfs_queue_work(fs_info->workers, &async->work);
862

C
Chris Mason 已提交
863
	while (atomic_read(&fs_info->async_submit_draining) &&
864 865 866 867 868
	      atomic_read(&fs_info->nr_async_submits)) {
		wait_event(fs_info->async_submit_wait,
			   (atomic_read(&fs_info->nr_async_submits) == 0));
	}

869 870 871
	return 0;
}

872 873
static int btree_csum_one_bio(struct bio *bio)
{
874
	struct bio_vec *bvec;
875
	struct btrfs_root *root;
876
	int i, ret = 0;
877

878
	bio_for_each_segment_all(bvec, bio, i) {
879
		root = BTRFS_I(bvec->bv_page->mapping->host)->root;
880
		ret = csum_dirty_buffer(root->fs_info, bvec->bv_page);
881 882
		if (ret)
			break;
883
	}
884

885
	return ret;
886 887
}

C
Chris Mason 已提交
888 889
static int __btree_submit_bio_start(struct inode *inode, int rw,
				    struct bio *bio, int mirror_num,
890 891
				    unsigned long bio_flags,
				    u64 bio_offset)
892
{
893 894
	/*
	 * when we're called for a write, we're already in the async
895
	 * submission context.  Just jump into btrfs_map_bio
896
	 */
897
	return btree_csum_one_bio(bio);
C
Chris Mason 已提交
898
}
899

C
Chris Mason 已提交
900
static int __btree_submit_bio_done(struct inode *inode, int rw, struct bio *bio,
901 902
				 int mirror_num, unsigned long bio_flags,
				 u64 bio_offset)
C
Chris Mason 已提交
903
{
904 905
	int ret;

906
	/*
C
Chris Mason 已提交
907 908
	 * when we're called for a write, we're already in the async
	 * submission context.  Just jump into btrfs_map_bio
909
	 */
910 911 912 913
	ret = btrfs_map_bio(BTRFS_I(inode)->root, rw, bio, mirror_num, 1);
	if (ret)
		bio_endio(bio, ret);
	return ret;
914 915
}

916 917 918 919 920 921 922 923 924 925 926
static int check_async_write(struct inode *inode, unsigned long bio_flags)
{
	if (bio_flags & EXTENT_BIO_TREE_LOG)
		return 0;
#ifdef CONFIG_X86
	if (cpu_has_xmm4_2)
		return 0;
#endif
	return 1;
}

927
static int btree_submit_bio_hook(struct inode *inode, int rw, struct bio *bio,
928 929
				 int mirror_num, unsigned long bio_flags,
				 u64 bio_offset)
930
{
931
	int async = check_async_write(inode, bio_flags);
932 933
	int ret;

934
	if (!(rw & REQ_WRITE)) {
C
Chris Mason 已提交
935 936 937 938
		/*
		 * called for a read, do the setup so that checksum validation
		 * can happen in the async kernel threads
		 */
939
		ret = btrfs_bio_wq_end_io(BTRFS_I(inode)->root->fs_info,
940
					  bio, BTRFS_WQ_ENDIO_METADATA);
941
		if (ret)
942 943 944
			goto out_w_error;
		ret = btrfs_map_bio(BTRFS_I(inode)->root, rw, bio,
				    mirror_num, 0);
945 946 947
	} else if (!async) {
		ret = btree_csum_one_bio(bio);
		if (ret)
948 949 950 951 952 953 954 955 956 957 958 959 960
			goto out_w_error;
		ret = btrfs_map_bio(BTRFS_I(inode)->root, rw, bio,
				    mirror_num, 0);
	} else {
		/*
		 * kthread helpers are used to submit writes so that
		 * checksumming can happen in parallel across all CPUs
		 */
		ret = btrfs_wq_submit_bio(BTRFS_I(inode)->root->fs_info,
					  inode, rw, bio, mirror_num, 0,
					  bio_offset,
					  __btree_submit_bio_start,
					  __btree_submit_bio_done);
961
	}
962

963 964 965 966 967
	if (ret) {
out_w_error:
		bio_endio(bio, ret);
	}
	return ret;
968 969
}

J
Jan Beulich 已提交
970
#ifdef CONFIG_MIGRATION
971
static int btree_migratepage(struct address_space *mapping,
972 973
			struct page *newpage, struct page *page,
			enum migrate_mode mode)
974 975 976 977 978 979 980 981 982 983 984 985 986 987
{
	/*
	 * we can't safely write a btree page from here,
	 * we haven't done the locking hook
	 */
	if (PageDirty(page))
		return -EAGAIN;
	/*
	 * Buffers may be managed in a filesystem specific way.
	 * We must have no buffers or drop them.
	 */
	if (page_has_private(page) &&
	    !try_to_release_page(page, GFP_KERNEL))
		return -EAGAIN;
988
	return migrate_page(mapping, newpage, page, mode);
989
}
J
Jan Beulich 已提交
990
#endif
991

992 993 994 995

static int btree_writepages(struct address_space *mapping,
			    struct writeback_control *wbc)
{
996 997 998
	struct btrfs_fs_info *fs_info;
	int ret;

999
	if (wbc->sync_mode == WB_SYNC_NONE) {
1000 1001 1002 1003

		if (wbc->for_kupdate)
			return 0;

1004
		fs_info = BTRFS_I(mapping->host)->root->fs_info;
1005
		/* this is a bit racy, but that's ok */
1006 1007 1008
		ret = percpu_counter_compare(&fs_info->dirty_metadata_bytes,
					     BTRFS_DIRTY_METADATA_THRESH);
		if (ret < 0)
1009 1010
			return 0;
	}
1011
	return btree_write_cache_pages(mapping, wbc);
1012 1013
}

1014
static int btree_readpage(struct file *file, struct page *page)
1015
{
1016 1017
	struct extent_io_tree *tree;
	tree = &BTRFS_I(page->mapping->host)->io_tree;
1018
	return extent_read_full_page(tree, page, btree_get_extent, 0);
1019
}
C
Chris Mason 已提交
1020

1021
static int btree_releasepage(struct page *page, gfp_t gfp_flags)
1022
{
1023
	if (PageWriteback(page) || PageDirty(page))
C
Chris Mason 已提交
1024
		return 0;
1025

1026
	return try_release_extent_buffer(page);
1027 1028
}

1029 1030
static void btree_invalidatepage(struct page *page, unsigned int offset,
				 unsigned int length)
1031
{
1032 1033
	struct extent_io_tree *tree;
	tree = &BTRFS_I(page->mapping->host)->io_tree;
1034 1035
	extent_invalidatepage(tree, page, offset);
	btree_releasepage(page, GFP_NOFS);
1036
	if (PagePrivate(page)) {
1037 1038 1039
		btrfs_warn(BTRFS_I(page->mapping->host)->root->fs_info,
			   "page private not zero on page %llu",
			   (unsigned long long)page_offset(page));
1040 1041 1042 1043
		ClearPagePrivate(page);
		set_page_private(page, 0);
		page_cache_release(page);
	}
1044 1045
}

1046 1047
static int btree_set_page_dirty(struct page *page)
{
1048
#ifdef DEBUG
1049 1050 1051 1052 1053 1054 1055 1056
	struct extent_buffer *eb;

	BUG_ON(!PagePrivate(page));
	eb = (struct extent_buffer *)page->private;
	BUG_ON(!eb);
	BUG_ON(!test_bit(EXTENT_BUFFER_DIRTY, &eb->bflags));
	BUG_ON(!atomic_read(&eb->refs));
	btrfs_assert_tree_locked(eb);
1057
#endif
1058 1059 1060
	return __set_page_dirty_nobuffers(page);
}

1061
static const struct address_space_operations btree_aops = {
1062
	.readpage	= btree_readpage,
1063
	.writepages	= btree_writepages,
1064 1065
	.releasepage	= btree_releasepage,
	.invalidatepage = btree_invalidatepage,
1066
#ifdef CONFIG_MIGRATION
1067
	.migratepage	= btree_migratepage,
1068
#endif
1069
	.set_page_dirty = btree_set_page_dirty,
1070 1071
};

1072
void readahead_tree_block(struct btrfs_root *root, u64 bytenr)
C
Chris Mason 已提交
1073
{
1074 1075
	struct extent_buffer *buf = NULL;
	struct inode *btree_inode = root->fs_info->btree_inode;
C
Chris Mason 已提交
1076

1077
	buf = btrfs_find_create_tree_block(root, bytenr);
1078
	if (!buf)
1079
		return;
1080
	read_extent_buffer_pages(&BTRFS_I(btree_inode)->io_tree,
1081
				 buf, 0, WAIT_NONE, btree_get_extent, 0);
1082
	free_extent_buffer(buf);
C
Chris Mason 已提交
1083 1084
}

1085
int reada_tree_block_flagged(struct btrfs_root *root, u64 bytenr,
1086 1087 1088 1089 1090 1091 1092
			 int mirror_num, struct extent_buffer **eb)
{
	struct extent_buffer *buf = NULL;
	struct inode *btree_inode = root->fs_info->btree_inode;
	struct extent_io_tree *io_tree = &BTRFS_I(btree_inode)->io_tree;
	int ret;

1093
	buf = btrfs_find_create_tree_block(root, bytenr);
1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108
	if (!buf)
		return 0;

	set_bit(EXTENT_BUFFER_READAHEAD, &buf->bflags);

	ret = read_extent_buffer_pages(io_tree, buf, 0, WAIT_PAGE_LOCK,
				       btree_get_extent, mirror_num);
	if (ret) {
		free_extent_buffer(buf);
		return ret;
	}

	if (test_bit(EXTENT_BUFFER_CORRUPT, &buf->bflags)) {
		free_extent_buffer(buf);
		return -EIO;
1109
	} else if (extent_buffer_uptodate(buf)) {
1110 1111 1112 1113 1114 1115 1116
		*eb = buf;
	} else {
		free_extent_buffer(buf);
	}
	return 0;
}

1117
struct extent_buffer *btrfs_find_tree_block(struct btrfs_fs_info *fs_info,
1118
					    u64 bytenr)
1119
{
1120
	return find_extent_buffer(fs_info, bytenr);
1121 1122 1123
}

struct extent_buffer *btrfs_find_create_tree_block(struct btrfs_root *root,
1124
						 u64 bytenr)
1125
{
1126
	if (btrfs_test_is_dummy_root(root))
1127 1128
		return alloc_test_extent_buffer(root->fs_info, bytenr);
	return alloc_extent_buffer(root->fs_info, bytenr);
1129 1130 1131
}


1132 1133
int btrfs_write_tree_block(struct extent_buffer *buf)
{
1134
	return filemap_fdatawrite_range(buf->pages[0]->mapping, buf->start,
1135
					buf->start + buf->len - 1);
1136 1137 1138 1139
}

int btrfs_wait_tree_block_writeback(struct extent_buffer *buf)
{
1140
	return filemap_fdatawait_range(buf->pages[0]->mapping,
1141
				       buf->start, buf->start + buf->len - 1);
1142 1143
}

1144
struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr,
1145
				      u64 parent_transid)
1146 1147 1148 1149
{
	struct extent_buffer *buf = NULL;
	int ret;

1150
	buf = btrfs_find_create_tree_block(root, bytenr);
1151 1152 1153
	if (!buf)
		return NULL;

1154
	ret = btree_read_extent_buffer_pages(root, buf, 0, parent_transid);
1155 1156 1157 1158
	if (ret) {
		free_extent_buffer(buf);
		return NULL;
	}
1159
	return buf;
1160

1161 1162
}

1163 1164
void clean_tree_block(struct btrfs_trans_handle *trans,
		      struct btrfs_fs_info *fs_info,
1165
		      struct extent_buffer *buf)
1166
{
1167
	if (btrfs_header_generation(buf) ==
1168
	    fs_info->running_transaction->transid) {
1169
		btrfs_assert_tree_locked(buf);
1170

1171
		if (test_and_clear_bit(EXTENT_BUFFER_DIRTY, &buf->bflags)) {
1172 1173 1174
			__percpu_counter_add(&fs_info->dirty_metadata_bytes,
					     -buf->len,
					     fs_info->dirty_metadata_batch);
1175 1176 1177 1178
			/* ugh, clear_extent_buffer_dirty needs to lock the page */
			btrfs_set_lock_blocking(buf);
			clear_extent_buffer_dirty(buf);
		}
1179
	}
1180 1181
}

1182 1183 1184 1185 1186 1187 1188 1189 1190
static struct btrfs_subvolume_writers *btrfs_alloc_subvolume_writers(void)
{
	struct btrfs_subvolume_writers *writers;
	int ret;

	writers = kmalloc(sizeof(*writers), GFP_NOFS);
	if (!writers)
		return ERR_PTR(-ENOMEM);

1191
	ret = percpu_counter_init(&writers->counter, 0, GFP_KERNEL);
1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207
	if (ret < 0) {
		kfree(writers);
		return ERR_PTR(ret);
	}

	init_waitqueue_head(&writers->wait);
	return writers;
}

static void
btrfs_free_subvolume_writers(struct btrfs_subvolume_writers *writers)
{
	percpu_counter_destroy(&writers->counter);
	kfree(writers);
}

1208 1209
static void __setup_root(u32 nodesize, u32 sectorsize, u32 stripesize,
			 struct btrfs_root *root, struct btrfs_fs_info *fs_info,
1210
			 u64 objectid)
1211
{
C
Chris Mason 已提交
1212
	root->node = NULL;
1213
	root->commit_root = NULL;
1214 1215
	root->sectorsize = sectorsize;
	root->nodesize = nodesize;
1216
	root->stripesize = stripesize;
1217
	root->state = 0;
1218
	root->orphan_cleanup_state = 0;
1219

1220 1221
	root->objectid = objectid;
	root->last_trans = 0;
1222
	root->highest_objectid = 0;
1223
	root->nr_delalloc_inodes = 0;
1224
	root->nr_ordered_extents = 0;
1225
	root->name = NULL;
1226
	root->inode_tree = RB_ROOT;
1227
	INIT_RADIX_TREE(&root->delayed_nodes_tree, GFP_ATOMIC);
1228
	root->block_rsv = NULL;
1229
	root->orphan_block_rsv = NULL;
1230 1231

	INIT_LIST_HEAD(&root->dirty_list);
1232
	INIT_LIST_HEAD(&root->root_list);
1233 1234
	INIT_LIST_HEAD(&root->delalloc_inodes);
	INIT_LIST_HEAD(&root->delalloc_root);
1235 1236
	INIT_LIST_HEAD(&root->ordered_extents);
	INIT_LIST_HEAD(&root->ordered_root);
1237 1238
	INIT_LIST_HEAD(&root->logged_list[0]);
	INIT_LIST_HEAD(&root->logged_list[1]);
1239
	spin_lock_init(&root->orphan_lock);
1240
	spin_lock_init(&root->inode_lock);
1241
	spin_lock_init(&root->delalloc_lock);
1242
	spin_lock_init(&root->ordered_extent_lock);
1243
	spin_lock_init(&root->accounting_lock);
1244 1245
	spin_lock_init(&root->log_extents_lock[0]);
	spin_lock_init(&root->log_extents_lock[1]);
1246
	mutex_init(&root->objectid_mutex);
1247
	mutex_init(&root->log_mutex);
1248
	mutex_init(&root->ordered_extent_mutex);
1249
	mutex_init(&root->delalloc_mutex);
Y
Yan Zheng 已提交
1250 1251 1252
	init_waitqueue_head(&root->log_writer_wait);
	init_waitqueue_head(&root->log_commit_wait[0]);
	init_waitqueue_head(&root->log_commit_wait[1]);
1253 1254
	INIT_LIST_HEAD(&root->log_ctxs[0]);
	INIT_LIST_HEAD(&root->log_ctxs[1]);
Y
Yan Zheng 已提交
1255 1256 1257
	atomic_set(&root->log_commit[0], 0);
	atomic_set(&root->log_commit[1], 0);
	atomic_set(&root->log_writers, 0);
M
Miao Xie 已提交
1258
	atomic_set(&root->log_batch, 0);
1259
	atomic_set(&root->orphan_inodes, 0);
1260
	atomic_set(&root->refs, 1);
1261
	atomic_set(&root->will_be_snapshoted, 0);
Y
Yan Zheng 已提交
1262
	root->log_transid = 0;
1263
	root->log_transid_committed = -1;
1264
	root->last_log_commit = 0;
1265 1266 1267
	if (fs_info)
		extent_io_tree_init(&root->dirty_log_pages,
				     fs_info->btree_inode->i_mapping);
C
Chris Mason 已提交
1268

1269 1270
	memset(&root->root_key, 0, sizeof(root->root_key));
	memset(&root->root_item, 0, sizeof(root->root_item));
1271
	memset(&root->defrag_progress, 0, sizeof(root->defrag_progress));
1272 1273 1274 1275
	if (fs_info)
		root->defrag_trans_start = fs_info->generation;
	else
		root->defrag_trans_start = 0;
1276
	root->root_key.objectid = objectid;
1277
	root->anon_dev = 0;
1278

1279
	spin_lock_init(&root->root_item_lock);
1280 1281
}

1282
static struct btrfs_root *btrfs_alloc_root(struct btrfs_fs_info *fs_info)
A
Al Viro 已提交
1283 1284 1285 1286 1287 1288 1289
{
	struct btrfs_root *root = kzalloc(sizeof(*root), GFP_NOFS);
	if (root)
		root->fs_info = fs_info;
	return root;
}

1290 1291 1292 1293 1294 1295 1296 1297 1298
#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
/* Should only be used by the testing infrastructure */
struct btrfs_root *btrfs_alloc_dummy_root(void)
{
	struct btrfs_root *root;

	root = btrfs_alloc_root(NULL);
	if (!root)
		return ERR_PTR(-ENOMEM);
1299
	__setup_root(4096, 4096, 4096, root, NULL, 1);
1300
	set_bit(BTRFS_ROOT_DUMMY_ROOT, &root->state);
1301
	root->alloc_bytenr = 0;
1302 1303 1304 1305 1306

	return root;
}
#endif

1307 1308 1309 1310 1311 1312 1313 1314 1315
struct btrfs_root *btrfs_create_tree(struct btrfs_trans_handle *trans,
				     struct btrfs_fs_info *fs_info,
				     u64 objectid)
{
	struct extent_buffer *leaf;
	struct btrfs_root *tree_root = fs_info->tree_root;
	struct btrfs_root *root;
	struct btrfs_key key;
	int ret = 0;
1316
	uuid_le uuid;
1317 1318 1319 1320 1321

	root = btrfs_alloc_root(fs_info);
	if (!root)
		return ERR_PTR(-ENOMEM);

1322 1323
	__setup_root(tree_root->nodesize, tree_root->sectorsize,
		tree_root->stripesize, root, fs_info, objectid);
1324 1325 1326 1327
	root->root_key.objectid = objectid;
	root->root_key.type = BTRFS_ROOT_ITEM_KEY;
	root->root_key.offset = 0;

1328
	leaf = btrfs_alloc_tree_block(trans, root, 0, objectid, NULL, 0, 0, 0);
1329 1330
	if (IS_ERR(leaf)) {
		ret = PTR_ERR(leaf);
1331
		leaf = NULL;
1332 1333 1334 1335 1336 1337 1338 1339 1340 1341
		goto fail;
	}

	memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header));
	btrfs_set_header_bytenr(leaf, leaf->start);
	btrfs_set_header_generation(leaf, trans->transid);
	btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV);
	btrfs_set_header_owner(leaf, objectid);
	root->node = leaf;

1342
	write_extent_buffer(leaf, fs_info->fsid, btrfs_header_fsid(),
1343 1344
			    BTRFS_FSID_SIZE);
	write_extent_buffer(leaf, fs_info->chunk_tree_uuid,
1345
			    btrfs_header_chunk_tree_uuid(leaf),
1346 1347 1348 1349
			    BTRFS_UUID_SIZE);
	btrfs_mark_buffer_dirty(leaf);

	root->commit_root = btrfs_root_node(root);
1350
	set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
1351 1352 1353 1354 1355 1356 1357 1358 1359 1360

	root->root_item.flags = 0;
	root->root_item.byte_limit = 0;
	btrfs_set_root_bytenr(&root->root_item, leaf->start);
	btrfs_set_root_generation(&root->root_item, trans->transid);
	btrfs_set_root_level(&root->root_item, 0);
	btrfs_set_root_refs(&root->root_item, 1);
	btrfs_set_root_used(&root->root_item, leaf->len);
	btrfs_set_root_last_snapshot(&root->root_item, 0);
	btrfs_set_root_dirid(&root->root_item, 0);
1361 1362
	uuid_le_gen(&uuid);
	memcpy(root->root_item.uuid, uuid.b, BTRFS_UUID_SIZE);
1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373
	root->root_item.drop_level = 0;

	key.objectid = objectid;
	key.type = BTRFS_ROOT_ITEM_KEY;
	key.offset = 0;
	ret = btrfs_insert_root(trans, tree_root, &key, &root->root_item);
	if (ret)
		goto fail;

	btrfs_tree_unlock(leaf);

1374 1375
	return root;

1376
fail:
1377 1378
	if (leaf) {
		btrfs_tree_unlock(leaf);
1379
		free_extent_buffer(root->commit_root);
1380 1381 1382
		free_extent_buffer(leaf);
	}
	kfree(root);
1383

1384
	return ERR_PTR(ret);
1385 1386
}

Y
Yan Zheng 已提交
1387 1388
static struct btrfs_root *alloc_log_tree(struct btrfs_trans_handle *trans,
					 struct btrfs_fs_info *fs_info)
1389 1390 1391
{
	struct btrfs_root *root;
	struct btrfs_root *tree_root = fs_info->tree_root;
Y
Yan Zheng 已提交
1392
	struct extent_buffer *leaf;
1393

A
Al Viro 已提交
1394
	root = btrfs_alloc_root(fs_info);
1395
	if (!root)
Y
Yan Zheng 已提交
1396
		return ERR_PTR(-ENOMEM);
1397

1398 1399 1400
	__setup_root(tree_root->nodesize, tree_root->sectorsize,
		     tree_root->stripesize, root, fs_info,
		     BTRFS_TREE_LOG_OBJECTID);
1401 1402 1403 1404

	root->root_key.objectid = BTRFS_TREE_LOG_OBJECTID;
	root->root_key.type = BTRFS_ROOT_ITEM_KEY;
	root->root_key.offset = BTRFS_TREE_LOG_OBJECTID;
1405

Y
Yan Zheng 已提交
1406
	/*
1407 1408
	 * DON'T set REF_COWS for log trees
	 *
Y
Yan Zheng 已提交
1409 1410 1411 1412 1413
	 * log trees do not get reference counted because they go away
	 * before a real commit is actually done.  They do store pointers
	 * to file data extents, and those reference counts still get
	 * updated (along with back refs to the log tree).
	 */
1414

1415 1416
	leaf = btrfs_alloc_tree_block(trans, root, 0, BTRFS_TREE_LOG_OBJECTID,
			NULL, 0, 0, 0);
Y
Yan Zheng 已提交
1417 1418 1419 1420
	if (IS_ERR(leaf)) {
		kfree(root);
		return ERR_CAST(leaf);
	}
1421

1422 1423 1424 1425 1426
	memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header));
	btrfs_set_header_bytenr(leaf, leaf->start);
	btrfs_set_header_generation(leaf, trans->transid);
	btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV);
	btrfs_set_header_owner(leaf, BTRFS_TREE_LOG_OBJECTID);
Y
Yan Zheng 已提交
1427
	root->node = leaf;
1428 1429

	write_extent_buffer(root->node, root->fs_info->fsid,
1430
			    btrfs_header_fsid(), BTRFS_FSID_SIZE);
1431 1432
	btrfs_mark_buffer_dirty(root->node);
	btrfs_tree_unlock(root->node);
Y
Yan Zheng 已提交
1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462
	return root;
}

int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans,
			     struct btrfs_fs_info *fs_info)
{
	struct btrfs_root *log_root;

	log_root = alloc_log_tree(trans, fs_info);
	if (IS_ERR(log_root))
		return PTR_ERR(log_root);
	WARN_ON(fs_info->log_root_tree);
	fs_info->log_root_tree = log_root;
	return 0;
}

int btrfs_add_log_tree(struct btrfs_trans_handle *trans,
		       struct btrfs_root *root)
{
	struct btrfs_root *log_root;
	struct btrfs_inode_item *inode_item;

	log_root = alloc_log_tree(trans, root->fs_info);
	if (IS_ERR(log_root))
		return PTR_ERR(log_root);

	log_root->last_trans = trans->transid;
	log_root->root_key.offset = root->root_key.objectid;

	inode_item = &log_root->root_item.inode;
1463 1464 1465
	btrfs_set_stack_inode_generation(inode_item, 1);
	btrfs_set_stack_inode_size(inode_item, 3);
	btrfs_set_stack_inode_nlink(inode_item, 1);
1466
	btrfs_set_stack_inode_nbytes(inode_item, root->nodesize);
1467
	btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755);
Y
Yan Zheng 已提交
1468

1469
	btrfs_set_root_node(&log_root->root_item, log_root->node);
Y
Yan Zheng 已提交
1470 1471 1472 1473

	WARN_ON(root->log_root);
	root->log_root = log_root;
	root->log_transid = 0;
1474
	root->log_transid_committed = -1;
1475
	root->last_log_commit = 0;
1476 1477 1478
	return 0;
}

1479 1480
static struct btrfs_root *btrfs_read_tree_root(struct btrfs_root *tree_root,
					       struct btrfs_key *key)
1481 1482 1483
{
	struct btrfs_root *root;
	struct btrfs_fs_info *fs_info = tree_root->fs_info;
1484
	struct btrfs_path *path;
1485
	u64 generation;
1486
	int ret;
1487

1488 1489
	path = btrfs_alloc_path();
	if (!path)
1490
		return ERR_PTR(-ENOMEM);
1491 1492 1493 1494 1495

	root = btrfs_alloc_root(fs_info);
	if (!root) {
		ret = -ENOMEM;
		goto alloc_fail;
1496 1497
	}

1498 1499
	__setup_root(tree_root->nodesize, tree_root->sectorsize,
		tree_root->stripesize, root, fs_info, key->objectid);
1500

1501 1502
	ret = btrfs_find_root(tree_root, key, path,
			      &root->root_item, &root->root_key);
1503
	if (ret) {
1504 1505
		if (ret > 0)
			ret = -ENOENT;
1506
		goto find_fail;
1507
	}
1508

1509
	generation = btrfs_root_generation(&root->root_item);
1510
	root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
1511
				     generation);
1512 1513 1514 1515 1516 1517
	if (!root->node) {
		ret = -ENOMEM;
		goto find_fail;
	} else if (!btrfs_buffer_uptodate(root->node, generation, 0)) {
		ret = -EIO;
		goto read_fail;
1518
	}
1519
	root->commit_root = btrfs_root_node(root);
1520
out:
1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542
	btrfs_free_path(path);
	return root;

read_fail:
	free_extent_buffer(root->node);
find_fail:
	kfree(root);
alloc_fail:
	root = ERR_PTR(ret);
	goto out;
}

struct btrfs_root *btrfs_read_fs_root(struct btrfs_root *tree_root,
				      struct btrfs_key *location)
{
	struct btrfs_root *root;

	root = btrfs_read_tree_root(tree_root, location);
	if (IS_ERR(root))
		return root;

	if (root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) {
1543
		set_bit(BTRFS_ROOT_REF_COWS, &root->state);
1544 1545
		btrfs_check_and_init_root_item(&root->root_item);
	}
1546

1547 1548 1549
	return root;
}

1550 1551 1552
int btrfs_init_fs_root(struct btrfs_root *root)
{
	int ret;
1553
	struct btrfs_subvolume_writers *writers;
1554 1555 1556 1557 1558 1559 1560 1561 1562

	root->free_ino_ctl = kzalloc(sizeof(*root->free_ino_ctl), GFP_NOFS);
	root->free_ino_pinned = kzalloc(sizeof(*root->free_ino_pinned),
					GFP_NOFS);
	if (!root->free_ino_pinned || !root->free_ino_ctl) {
		ret = -ENOMEM;
		goto fail;
	}

1563 1564 1565 1566 1567 1568 1569
	writers = btrfs_alloc_subvolume_writers();
	if (IS_ERR(writers)) {
		ret = PTR_ERR(writers);
		goto fail;
	}
	root->subv_writers = writers;

1570
	btrfs_init_free_ino_ctl(root);
1571 1572
	spin_lock_init(&root->ino_cache_lock);
	init_waitqueue_head(&root->ino_cache_wait);
1573 1574 1575

	ret = get_anon_bdev(&root->anon_dev);
	if (ret)
1576
		goto free_writers;
1577
	return 0;
1578 1579 1580

free_writers:
	btrfs_free_subvolume_writers(root->subv_writers);
1581 1582 1583 1584 1585 1586
fail:
	kfree(root->free_ino_ctl);
	kfree(root->free_ino_pinned);
	return ret;
}

1587 1588
static struct btrfs_root *btrfs_lookup_fs_root(struct btrfs_fs_info *fs_info,
					       u64 root_id)
1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612
{
	struct btrfs_root *root;

	spin_lock(&fs_info->fs_roots_radix_lock);
	root = radix_tree_lookup(&fs_info->fs_roots_radix,
				 (unsigned long)root_id);
	spin_unlock(&fs_info->fs_roots_radix_lock);
	return root;
}

int btrfs_insert_fs_root(struct btrfs_fs_info *fs_info,
			 struct btrfs_root *root)
{
	int ret;

	ret = radix_tree_preload(GFP_NOFS & ~__GFP_HIGHMEM);
	if (ret)
		return ret;

	spin_lock(&fs_info->fs_roots_radix_lock);
	ret = radix_tree_insert(&fs_info->fs_roots_radix,
				(unsigned long)root->root_key.objectid,
				root);
	if (ret == 0)
1613
		set_bit(BTRFS_ROOT_IN_RADIX, &root->state);
1614 1615 1616 1617 1618 1619
	spin_unlock(&fs_info->fs_roots_radix_lock);
	radix_tree_preload_end();

	return ret;
}

1620 1621 1622
struct btrfs_root *btrfs_get_fs_root(struct btrfs_fs_info *fs_info,
				     struct btrfs_key *location,
				     bool check_ref)
1623 1624
{
	struct btrfs_root *root;
1625
	struct btrfs_path *path;
1626
	struct btrfs_key key;
1627 1628
	int ret;

1629 1630 1631 1632
	if (location->objectid == BTRFS_ROOT_TREE_OBJECTID)
		return fs_info->tree_root;
	if (location->objectid == BTRFS_EXTENT_TREE_OBJECTID)
		return fs_info->extent_root;
1633 1634 1635 1636
	if (location->objectid == BTRFS_CHUNK_TREE_OBJECTID)
		return fs_info->chunk_root;
	if (location->objectid == BTRFS_DEV_TREE_OBJECTID)
		return fs_info->dev_root;
1637 1638
	if (location->objectid == BTRFS_CSUM_TREE_OBJECTID)
		return fs_info->csum_root;
1639 1640 1641
	if (location->objectid == BTRFS_QUOTA_TREE_OBJECTID)
		return fs_info->quota_root ? fs_info->quota_root :
					     ERR_PTR(-ENOENT);
1642 1643 1644
	if (location->objectid == BTRFS_UUID_TREE_OBJECTID)
		return fs_info->uuid_root ? fs_info->uuid_root :
					    ERR_PTR(-ENOENT);
1645
again:
1646
	root = btrfs_lookup_fs_root(fs_info, location->objectid);
1647
	if (root) {
1648
		if (check_ref && btrfs_root_refs(&root->root_item) == 0)
1649
			return ERR_PTR(-ENOENT);
1650
		return root;
1651
	}
1652

1653
	root = btrfs_read_fs_root(fs_info->tree_root, location);
1654 1655
	if (IS_ERR(root))
		return root;
1656

1657
	if (check_ref && btrfs_root_refs(&root->root_item) == 0) {
1658
		ret = -ENOENT;
1659
		goto fail;
1660
	}
1661

1662
	ret = btrfs_init_fs_root(root);
1663 1664
	if (ret)
		goto fail;
1665

1666 1667 1668 1669 1670
	path = btrfs_alloc_path();
	if (!path) {
		ret = -ENOMEM;
		goto fail;
	}
1671 1672 1673 1674 1675
	key.objectid = BTRFS_ORPHAN_OBJECTID;
	key.type = BTRFS_ORPHAN_ITEM_KEY;
	key.offset = location->objectid;

	ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0);
1676
	btrfs_free_path(path);
1677 1678 1679
	if (ret < 0)
		goto fail;
	if (ret == 0)
1680
		set_bit(BTRFS_ROOT_ORPHAN_ITEM_INSERTED, &root->state);
1681

1682
	ret = btrfs_insert_fs_root(fs_info, root);
1683
	if (ret) {
1684 1685 1686 1687 1688
		if (ret == -EEXIST) {
			free_fs_root(root);
			goto again;
		}
		goto fail;
1689
	}
1690
	return root;
1691 1692 1693
fail:
	free_fs_root(root);
	return ERR_PTR(ret);
1694 1695
}

C
Chris Mason 已提交
1696 1697 1698 1699 1700 1701
static int btrfs_congested_fn(void *congested_data, int bdi_bits)
{
	struct btrfs_fs_info *info = (struct btrfs_fs_info *)congested_data;
	int ret = 0;
	struct btrfs_device *device;
	struct backing_dev_info *bdi;
C
Chris Mason 已提交
1702

1703 1704
	rcu_read_lock();
	list_for_each_entry_rcu(device, &info->fs_devices->devices, dev_list) {
1705 1706
		if (!device->bdev)
			continue;
C
Chris Mason 已提交
1707
		bdi = blk_get_backing_dev_info(device->bdev);
1708
		if (bdi_congested(bdi, bdi_bits)) {
C
Chris Mason 已提交
1709 1710 1711 1712
			ret = 1;
			break;
		}
	}
1713
	rcu_read_unlock();
C
Chris Mason 已提交
1714 1715 1716 1717 1718
	return ret;
}

static int setup_bdi(struct btrfs_fs_info *info, struct backing_dev_info *bdi)
{
1719 1720
	int err;

1721
	err = bdi_setup_and_register(bdi, "btrfs");
1722 1723 1724
	if (err)
		return err;

1725
	bdi->ra_pages = VM_MAX_READAHEAD * 1024 / PAGE_CACHE_SIZE;
C
Chris Mason 已提交
1726 1727 1728 1729 1730
	bdi->congested_fn	= btrfs_congested_fn;
	bdi->congested_data	= info;
	return 0;
}

1731 1732 1733 1734 1735
/*
 * called by the kthread helper functions to finally call the bio end_io
 * functions.  This is where read checksum verification actually happens
 */
static void end_workqueue_fn(struct btrfs_work *work)
1736 1737
{
	struct bio *bio;
1738
	struct btrfs_end_io_wq *end_io_wq;
1739 1740
	int error;

1741
	end_io_wq = container_of(work, struct btrfs_end_io_wq, work);
1742
	bio = end_io_wq->bio;
1743

1744 1745 1746
	error = end_io_wq->error;
	bio->bi_private = end_io_wq->private;
	bio->bi_end_io = end_io_wq->end_io;
1747
	kmem_cache_free(btrfs_end_io_wq_cache, end_io_wq);
1748
	bio_endio_nodec(bio, error);
1749 1750
}

1751 1752 1753
static int cleaner_kthread(void *arg)
{
	struct btrfs_root *root = arg;
1754
	int again;
1755 1756

	do {
1757
		again = 0;
1758

1759
		/* Make the cleaner go to sleep early. */
1760
		if (btrfs_need_cleaner_sleep(root))
1761 1762 1763 1764 1765
			goto sleep;

		if (!mutex_trylock(&root->fs_info->cleaner_mutex))
			goto sleep;

1766 1767 1768 1769
		/*
		 * Avoid the problem that we change the status of the fs
		 * during the above check and trylock.
		 */
1770
		if (btrfs_need_cleaner_sleep(root)) {
1771 1772
			mutex_unlock(&root->fs_info->cleaner_mutex);
			goto sleep;
1773
		}
1774

1775
		btrfs_run_delayed_iputs(root);
1776
		btrfs_delete_unused_bgs(root->fs_info);
1777 1778 1779 1780
		again = btrfs_clean_one_deleted_snapshot(root);
		mutex_unlock(&root->fs_info->cleaner_mutex);

		/*
1781 1782
		 * The defragger has dealt with the R/O remount and umount,
		 * needn't do anything special here.
1783 1784 1785
		 */
		btrfs_run_defrag_inodes(root->fs_info);
sleep:
D
David Sterba 已提交
1786
		if (!try_to_freeze() && !again) {
1787
			set_current_state(TASK_INTERRUPTIBLE);
1788 1789
			if (!kthread_should_stop())
				schedule();
1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800
			__set_current_state(TASK_RUNNING);
		}
	} while (!kthread_should_stop());
	return 0;
}

static int transaction_kthread(void *arg)
{
	struct btrfs_root *root = arg;
	struct btrfs_trans_handle *trans;
	struct btrfs_transaction *cur;
1801
	u64 transid;
1802 1803
	unsigned long now;
	unsigned long delay;
1804
	bool cannot_commit;
1805 1806

	do {
1807
		cannot_commit = false;
1808
		delay = HZ * root->fs_info->commit_interval;
1809 1810
		mutex_lock(&root->fs_info->transaction_kthread_mutex);

J
Josef Bacik 已提交
1811
		spin_lock(&root->fs_info->trans_lock);
1812 1813
		cur = root->fs_info->running_transaction;
		if (!cur) {
J
Josef Bacik 已提交
1814
			spin_unlock(&root->fs_info->trans_lock);
1815 1816
			goto sleep;
		}
Y
Yan Zheng 已提交
1817

1818
		now = get_seconds();
1819
		if (cur->state < TRANS_STATE_BLOCKED &&
1820 1821
		    (now < cur->start_time ||
		     now - cur->start_time < root->fs_info->commit_interval)) {
J
Josef Bacik 已提交
1822
			spin_unlock(&root->fs_info->trans_lock);
1823 1824 1825
			delay = HZ * 5;
			goto sleep;
		}
1826
		transid = cur->transid;
J
Josef Bacik 已提交
1827
		spin_unlock(&root->fs_info->trans_lock);
1828

1829
		/* If the file system is aborted, this will always fail. */
1830
		trans = btrfs_attach_transaction(root);
1831
		if (IS_ERR(trans)) {
1832 1833
			if (PTR_ERR(trans) != -ENOENT)
				cannot_commit = true;
1834
			goto sleep;
1835
		}
1836
		if (transid == trans->transid) {
1837
			btrfs_commit_transaction(trans, root);
1838 1839 1840
		} else {
			btrfs_end_transaction(trans, root);
		}
1841 1842 1843 1844
sleep:
		wake_up_process(root->fs_info->cleaner_kthread);
		mutex_unlock(&root->fs_info->transaction_kthread_mutex);

J
Josef Bacik 已提交
1845 1846 1847
		if (unlikely(test_bit(BTRFS_FS_STATE_ERROR,
				      &root->fs_info->fs_state)))
			btrfs_cleanup_transaction(root);
1848
		if (!try_to_freeze()) {
1849
			set_current_state(TASK_INTERRUPTIBLE);
1850
			if (!kthread_should_stop() &&
1851 1852
			    (!btrfs_transaction_blocked(root->fs_info) ||
			     cannot_commit))
1853
				schedule_timeout(delay);
1854 1855 1856 1857 1858 1859
			__set_current_state(TASK_RUNNING);
		}
	} while (!kthread_should_stop());
	return 0;
}

C
Chris Mason 已提交
1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965
/*
 * this will find the highest generation in the array of
 * root backups.  The index of the highest array is returned,
 * or -1 if we can't find anything.
 *
 * We check to make sure the array is valid by comparing the
 * generation of the latest  root in the array with the generation
 * in the super block.  If they don't match we pitch it.
 */
static int find_newest_super_backup(struct btrfs_fs_info *info, u64 newest_gen)
{
	u64 cur;
	int newest_index = -1;
	struct btrfs_root_backup *root_backup;
	int i;

	for (i = 0; i < BTRFS_NUM_BACKUP_ROOTS; i++) {
		root_backup = info->super_copy->super_roots + i;
		cur = btrfs_backup_tree_root_gen(root_backup);
		if (cur == newest_gen)
			newest_index = i;
	}

	/* check to see if we actually wrapped around */
	if (newest_index == BTRFS_NUM_BACKUP_ROOTS - 1) {
		root_backup = info->super_copy->super_roots;
		cur = btrfs_backup_tree_root_gen(root_backup);
		if (cur == newest_gen)
			newest_index = 0;
	}
	return newest_index;
}


/*
 * find the oldest backup so we know where to store new entries
 * in the backup array.  This will set the backup_root_index
 * field in the fs_info struct
 */
static void find_oldest_super_backup(struct btrfs_fs_info *info,
				     u64 newest_gen)
{
	int newest_index = -1;

	newest_index = find_newest_super_backup(info, newest_gen);
	/* if there was garbage in there, just move along */
	if (newest_index == -1) {
		info->backup_root_index = 0;
	} else {
		info->backup_root_index = (newest_index + 1) % BTRFS_NUM_BACKUP_ROOTS;
	}
}

/*
 * copy all the root pointers into the super backup array.
 * this will bump the backup pointer by one when it is
 * done
 */
static void backup_super_roots(struct btrfs_fs_info *info)
{
	int next_backup;
	struct btrfs_root_backup *root_backup;
	int last_backup;

	next_backup = info->backup_root_index;
	last_backup = (next_backup + BTRFS_NUM_BACKUP_ROOTS - 1) %
		BTRFS_NUM_BACKUP_ROOTS;

	/*
	 * just overwrite the last backup if we're at the same generation
	 * this happens only at umount
	 */
	root_backup = info->super_for_commit->super_roots + last_backup;
	if (btrfs_backup_tree_root_gen(root_backup) ==
	    btrfs_header_generation(info->tree_root->node))
		next_backup = last_backup;

	root_backup = info->super_for_commit->super_roots + next_backup;

	/*
	 * make sure all of our padding and empty slots get zero filled
	 * regardless of which ones we use today
	 */
	memset(root_backup, 0, sizeof(*root_backup));

	info->backup_root_index = (next_backup + 1) % BTRFS_NUM_BACKUP_ROOTS;

	btrfs_set_backup_tree_root(root_backup, info->tree_root->node->start);
	btrfs_set_backup_tree_root_gen(root_backup,
			       btrfs_header_generation(info->tree_root->node));

	btrfs_set_backup_tree_root_level(root_backup,
			       btrfs_header_level(info->tree_root->node));

	btrfs_set_backup_chunk_root(root_backup, info->chunk_root->node->start);
	btrfs_set_backup_chunk_root_gen(root_backup,
			       btrfs_header_generation(info->chunk_root->node));
	btrfs_set_backup_chunk_root_level(root_backup,
			       btrfs_header_level(info->chunk_root->node));

	btrfs_set_backup_extent_root(root_backup, info->extent_root->node->start);
	btrfs_set_backup_extent_root_gen(root_backup,
			       btrfs_header_generation(info->extent_root->node));
	btrfs_set_backup_extent_root_level(root_backup,
			       btrfs_header_level(info->extent_root->node));

1966 1967 1968 1969 1970 1971 1972 1973
	/*
	 * we might commit during log recovery, which happens before we set
	 * the fs_root.  Make sure it is valid before we fill it in.
	 */
	if (info->fs_root && info->fs_root->node) {
		btrfs_set_backup_fs_root(root_backup,
					 info->fs_root->node->start);
		btrfs_set_backup_fs_root_gen(root_backup,
C
Chris Mason 已提交
1974
			       btrfs_header_generation(info->fs_root->node));
1975
		btrfs_set_backup_fs_root_level(root_backup,
C
Chris Mason 已提交
1976
			       btrfs_header_level(info->fs_root->node));
1977
	}
C
Chris Mason 已提交
1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058

	btrfs_set_backup_dev_root(root_backup, info->dev_root->node->start);
	btrfs_set_backup_dev_root_gen(root_backup,
			       btrfs_header_generation(info->dev_root->node));
	btrfs_set_backup_dev_root_level(root_backup,
				       btrfs_header_level(info->dev_root->node));

	btrfs_set_backup_csum_root(root_backup, info->csum_root->node->start);
	btrfs_set_backup_csum_root_gen(root_backup,
			       btrfs_header_generation(info->csum_root->node));
	btrfs_set_backup_csum_root_level(root_backup,
			       btrfs_header_level(info->csum_root->node));

	btrfs_set_backup_total_bytes(root_backup,
			     btrfs_super_total_bytes(info->super_copy));
	btrfs_set_backup_bytes_used(root_backup,
			     btrfs_super_bytes_used(info->super_copy));
	btrfs_set_backup_num_devices(root_backup,
			     btrfs_super_num_devices(info->super_copy));

	/*
	 * if we don't copy this out to the super_copy, it won't get remembered
	 * for the next commit
	 */
	memcpy(&info->super_copy->super_roots,
	       &info->super_for_commit->super_roots,
	       sizeof(*root_backup) * BTRFS_NUM_BACKUP_ROOTS);
}

/*
 * this copies info out of the root backup array and back into
 * the in-memory super block.  It is meant to help iterate through
 * the array, so you send it the number of backups you've already
 * tried and the last backup index you used.
 *
 * this returns -1 when it has tried all the backups
 */
static noinline int next_root_backup(struct btrfs_fs_info *info,
				     struct btrfs_super_block *super,
				     int *num_backups_tried, int *backup_index)
{
	struct btrfs_root_backup *root_backup;
	int newest = *backup_index;

	if (*num_backups_tried == 0) {
		u64 gen = btrfs_super_generation(super);

		newest = find_newest_super_backup(info, gen);
		if (newest == -1)
			return -1;

		*backup_index = newest;
		*num_backups_tried = 1;
	} else if (*num_backups_tried == BTRFS_NUM_BACKUP_ROOTS) {
		/* we've tried all the backups, all done */
		return -1;
	} else {
		/* jump to the next oldest backup */
		newest = (*backup_index + BTRFS_NUM_BACKUP_ROOTS - 1) %
			BTRFS_NUM_BACKUP_ROOTS;
		*backup_index = newest;
		*num_backups_tried += 1;
	}
	root_backup = super->super_roots + newest;

	btrfs_set_super_generation(super,
				   btrfs_backup_tree_root_gen(root_backup));
	btrfs_set_super_root(super, btrfs_backup_tree_root(root_backup));
	btrfs_set_super_root_level(super,
				   btrfs_backup_tree_root_level(root_backup));
	btrfs_set_super_bytes_used(super, btrfs_backup_bytes_used(root_backup));

	/*
	 * fixme: the total bytes and num_devices need to match or we should
	 * need a fsck
	 */
	btrfs_set_super_total_bytes(super, btrfs_backup_total_bytes(root_backup));
	btrfs_set_super_num_devices(super, btrfs_backup_num_devices(root_backup));
	return 0;
}

L
Liu Bo 已提交
2059 2060 2061
/* helper to cleanup workers */
static void btrfs_stop_all_workers(struct btrfs_fs_info *fs_info)
{
2062
	btrfs_destroy_workqueue(fs_info->fixup_workers);
2063
	btrfs_destroy_workqueue(fs_info->delalloc_workers);
2064
	btrfs_destroy_workqueue(fs_info->workers);
2065 2066 2067
	btrfs_destroy_workqueue(fs_info->endio_workers);
	btrfs_destroy_workqueue(fs_info->endio_meta_workers);
	btrfs_destroy_workqueue(fs_info->endio_raid56_workers);
2068
	btrfs_destroy_workqueue(fs_info->endio_repair_workers);
2069
	btrfs_destroy_workqueue(fs_info->rmw_workers);
2070 2071 2072
	btrfs_destroy_workqueue(fs_info->endio_meta_write_workers);
	btrfs_destroy_workqueue(fs_info->endio_write_workers);
	btrfs_destroy_workqueue(fs_info->endio_freespace_worker);
2073
	btrfs_destroy_workqueue(fs_info->submit_workers);
2074
	btrfs_destroy_workqueue(fs_info->delayed_workers);
2075
	btrfs_destroy_workqueue(fs_info->caching_workers);
2076
	btrfs_destroy_workqueue(fs_info->readahead_workers);
2077
	btrfs_destroy_workqueue(fs_info->flush_workers);
2078
	btrfs_destroy_workqueue(fs_info->qgroup_rescan_workers);
C
Chris Mason 已提交
2079
	btrfs_destroy_workqueue(fs_info->extent_workers);
L
Liu Bo 已提交
2080 2081
}

2082 2083 2084 2085 2086 2087 2088 2089 2090 2091
static void free_root_extent_buffers(struct btrfs_root *root)
{
	if (root) {
		free_extent_buffer(root->node);
		free_extent_buffer(root->commit_root);
		root->node = NULL;
		root->commit_root = NULL;
	}
}

C
Chris Mason 已提交
2092 2093 2094
/* helper to cleanup tree roots */
static void free_root_pointers(struct btrfs_fs_info *info, int chunk_root)
{
2095
	free_root_extent_buffers(info->tree_root);
2096

2097 2098 2099 2100 2101 2102 2103
	free_root_extent_buffers(info->dev_root);
	free_root_extent_buffers(info->extent_root);
	free_root_extent_buffers(info->csum_root);
	free_root_extent_buffers(info->quota_root);
	free_root_extent_buffers(info->uuid_root);
	if (chunk_root)
		free_root_extent_buffers(info->chunk_root);
C
Chris Mason 已提交
2104 2105
}

2106
void btrfs_free_fs_roots(struct btrfs_fs_info *fs_info)
2107 2108 2109 2110 2111 2112 2113 2114 2115 2116
{
	int ret;
	struct btrfs_root *gang[8];
	int i;

	while (!list_empty(&fs_info->dead_roots)) {
		gang[0] = list_entry(fs_info->dead_roots.next,
				     struct btrfs_root, root_list);
		list_del(&gang[0]->root_list);

2117
		if (test_bit(BTRFS_ROOT_IN_RADIX, &gang[0]->state)) {
2118
			btrfs_drop_and_free_fs_root(fs_info, gang[0]);
2119 2120 2121
		} else {
			free_extent_buffer(gang[0]->node);
			free_extent_buffer(gang[0]->commit_root);
2122
			btrfs_put_fs_root(gang[0]);
2123 2124 2125 2126 2127 2128 2129 2130 2131 2132
		}
	}

	while (1) {
		ret = radix_tree_gang_lookup(&fs_info->fs_roots_radix,
					     (void **)gang, 0,
					     ARRAY_SIZE(gang));
		if (!ret)
			break;
		for (i = 0; i < ret; i++)
2133
			btrfs_drop_and_free_fs_root(fs_info, gang[i]);
2134
	}
2135 2136 2137 2138 2139 2140

	if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state)) {
		btrfs_free_log_root_tree(NULL, fs_info);
		btrfs_destroy_pinned_extent(fs_info->tree_root,
					    fs_info->pinned_extents);
	}
2141
}
C
Chris Mason 已提交
2142

2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 2153
static void btrfs_init_scrub(struct btrfs_fs_info *fs_info)
{
	mutex_init(&fs_info->scrub_lock);
	atomic_set(&fs_info->scrubs_running, 0);
	atomic_set(&fs_info->scrub_pause_req, 0);
	atomic_set(&fs_info->scrubs_paused, 0);
	atomic_set(&fs_info->scrub_cancel_req, 0);
	init_waitqueue_head(&fs_info->scrub_pause_wait);
	fs_info->scrub_workers_refcnt = 0;
}

2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164
static void btrfs_init_balance(struct btrfs_fs_info *fs_info)
{
	spin_lock_init(&fs_info->balance_lock);
	mutex_init(&fs_info->balance_mutex);
	atomic_set(&fs_info->balance_running, 0);
	atomic_set(&fs_info->balance_pause_req, 0);
	atomic_set(&fs_info->balance_cancel_req, 0);
	fs_info->balance_ctl = NULL;
	init_waitqueue_head(&fs_info->balance_wait_q);
}

2165 2166 2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193
static void btrfs_init_btree_inode(struct btrfs_fs_info *fs_info,
				   struct btrfs_root *tree_root)
{
	fs_info->btree_inode->i_ino = BTRFS_BTREE_INODE_OBJECTID;
	set_nlink(fs_info->btree_inode, 1);
	/*
	 * we set the i_size on the btree inode to the max possible int.
	 * the real end of the address space is determined by all of
	 * the devices in the system
	 */
	fs_info->btree_inode->i_size = OFFSET_MAX;
	fs_info->btree_inode->i_mapping->a_ops = &btree_aops;

	RB_CLEAR_NODE(&BTRFS_I(fs_info->btree_inode)->rb_node);
	extent_io_tree_init(&BTRFS_I(fs_info->btree_inode)->io_tree,
			     fs_info->btree_inode->i_mapping);
	BTRFS_I(fs_info->btree_inode)->io_tree.track_uptodate = 0;
	extent_map_tree_init(&BTRFS_I(fs_info->btree_inode)->extent_tree);

	BTRFS_I(fs_info->btree_inode)->io_tree.ops = &btree_extent_io_ops;

	BTRFS_I(fs_info->btree_inode)->root = tree_root;
	memset(&BTRFS_I(fs_info->btree_inode)->location, 0,
	       sizeof(struct btrfs_key));
	set_bit(BTRFS_INODE_DUMMY,
		&BTRFS_I(fs_info->btree_inode)->runtime_flags);
	btrfs_insert_inode_hash(fs_info->btree_inode);
}

2194 2195 2196 2197 2198 2199 2200 2201 2202 2203
static void btrfs_init_dev_replace_locks(struct btrfs_fs_info *fs_info)
{
	fs_info->dev_replace.lock_owner = 0;
	atomic_set(&fs_info->dev_replace.nesting_level, 0);
	mutex_init(&fs_info->dev_replace.lock_finishing_cancel_unmount);
	mutex_init(&fs_info->dev_replace.lock_management_lock);
	mutex_init(&fs_info->dev_replace.lock);
	init_waitqueue_head(&fs_info->replace_wait);
}

2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 2214 2215 2216 2217
static void btrfs_init_qgroup(struct btrfs_fs_info *fs_info)
{
	spin_lock_init(&fs_info->qgroup_lock);
	mutex_init(&fs_info->qgroup_ioctl_lock);
	fs_info->qgroup_tree = RB_ROOT;
	fs_info->qgroup_op_tree = RB_ROOT;
	INIT_LIST_HEAD(&fs_info->dirty_qgroups);
	fs_info->qgroup_seq = 1;
	fs_info->quota_enabled = 0;
	fs_info->pending_quota_state = 0;
	fs_info->qgroup_ulist = NULL;
	mutex_init(&fs_info->qgroup_rescan_lock);
}

2218 2219 2220 2221
static int btrfs_init_workqueues(struct btrfs_fs_info *fs_info,
		struct btrfs_fs_devices *fs_devices)
{
	int max_active = fs_info->thread_pool_size;
2222
	unsigned int flags = WQ_MEM_RECLAIM | WQ_FREEZABLE | WQ_UNBOUND;
2223 2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234 2235 2236 2237 2238 2239 2240 2241 2242 2243 2244 2245 2246 2247 2248 2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264 2265 2266 2267 2268 2269 2270 2271 2272 2273 2274 2275 2276 2277 2278 2279 2280 2281 2282 2283 2284 2285 2286 2287 2288 2289 2290 2291 2292 2293 2294 2295 2296 2297

	fs_info->workers =
		btrfs_alloc_workqueue("worker", flags | WQ_HIGHPRI,
				      max_active, 16);

	fs_info->delalloc_workers =
		btrfs_alloc_workqueue("delalloc", flags, max_active, 2);

	fs_info->flush_workers =
		btrfs_alloc_workqueue("flush_delalloc", flags, max_active, 0);

	fs_info->caching_workers =
		btrfs_alloc_workqueue("cache", flags, max_active, 0);

	/*
	 * a higher idle thresh on the submit workers makes it much more
	 * likely that bios will be send down in a sane order to the
	 * devices
	 */
	fs_info->submit_workers =
		btrfs_alloc_workqueue("submit", flags,
				      min_t(u64, fs_devices->num_devices,
					    max_active), 64);

	fs_info->fixup_workers =
		btrfs_alloc_workqueue("fixup", flags, 1, 0);

	/*
	 * endios are largely parallel and should have a very
	 * low idle thresh
	 */
	fs_info->endio_workers =
		btrfs_alloc_workqueue("endio", flags, max_active, 4);
	fs_info->endio_meta_workers =
		btrfs_alloc_workqueue("endio-meta", flags, max_active, 4);
	fs_info->endio_meta_write_workers =
		btrfs_alloc_workqueue("endio-meta-write", flags, max_active, 2);
	fs_info->endio_raid56_workers =
		btrfs_alloc_workqueue("endio-raid56", flags, max_active, 4);
	fs_info->endio_repair_workers =
		btrfs_alloc_workqueue("endio-repair", flags, 1, 0);
	fs_info->rmw_workers =
		btrfs_alloc_workqueue("rmw", flags, max_active, 2);
	fs_info->endio_write_workers =
		btrfs_alloc_workqueue("endio-write", flags, max_active, 2);
	fs_info->endio_freespace_worker =
		btrfs_alloc_workqueue("freespace-write", flags, max_active, 0);
	fs_info->delayed_workers =
		btrfs_alloc_workqueue("delayed-meta", flags, max_active, 0);
	fs_info->readahead_workers =
		btrfs_alloc_workqueue("readahead", flags, max_active, 2);
	fs_info->qgroup_rescan_workers =
		btrfs_alloc_workqueue("qgroup-rescan", flags, 1, 0);
	fs_info->extent_workers =
		btrfs_alloc_workqueue("extent-refs", flags,
				      min_t(u64, fs_devices->num_devices,
					    max_active), 8);

	if (!(fs_info->workers && fs_info->delalloc_workers &&
	      fs_info->submit_workers && fs_info->flush_workers &&
	      fs_info->endio_workers && fs_info->endio_meta_workers &&
	      fs_info->endio_meta_write_workers &&
	      fs_info->endio_repair_workers &&
	      fs_info->endio_write_workers && fs_info->endio_raid56_workers &&
	      fs_info->endio_freespace_worker && fs_info->rmw_workers &&
	      fs_info->caching_workers && fs_info->readahead_workers &&
	      fs_info->fixup_workers && fs_info->delayed_workers &&
	      fs_info->extent_workers &&
	      fs_info->qgroup_rescan_workers)) {
		return -ENOMEM;
	}

	return 0;
}

2298 2299 2300 2301 2302 2303 2304 2305 2306 2307 2308 2309 2310 2311 2312 2313 2314 2315 2316 2317 2318 2319 2320 2321 2322 2323 2324 2325 2326 2327 2328 2329 2330 2331 2332 2333 2334 2335 2336 2337 2338 2339 2340 2341 2342 2343 2344 2345 2346 2347 2348
static int btrfs_replay_log(struct btrfs_fs_info *fs_info,
			    struct btrfs_fs_devices *fs_devices)
{
	int ret;
	struct btrfs_root *tree_root = fs_info->tree_root;
	struct btrfs_root *log_tree_root;
	struct btrfs_super_block *disk_super = fs_info->super_copy;
	u64 bytenr = btrfs_super_log_root(disk_super);

	if (fs_devices->rw_devices == 0) {
		printk(KERN_WARNING "BTRFS: log replay required "
		       "on RO media\n");
		return -EIO;
	}

	log_tree_root = btrfs_alloc_root(fs_info);
	if (!log_tree_root)
		return -ENOMEM;

	__setup_root(tree_root->nodesize, tree_root->sectorsize,
			tree_root->stripesize, log_tree_root, fs_info,
			BTRFS_TREE_LOG_OBJECTID);

	log_tree_root->node = read_tree_block(tree_root, bytenr,
			fs_info->generation + 1);
	if (!log_tree_root->node ||
	    !extent_buffer_uptodate(log_tree_root->node)) {
		printk(KERN_ERR "BTRFS: failed to read log tree\n");
		free_extent_buffer(log_tree_root->node);
		kfree(log_tree_root);
		return -EIO;
	}
	/* returns with log_tree_root freed on success */
	ret = btrfs_recover_log_trees(log_tree_root);
	if (ret) {
		btrfs_error(tree_root->fs_info, ret,
			    "Failed to recover log tree");
		free_extent_buffer(log_tree_root->node);
		kfree(log_tree_root);
		return ret;
	}

	if (fs_info->sb->s_flags & MS_RDONLY) {
		ret = btrfs_commit_super(tree_root);
		if (ret)
			return ret;
	}

	return 0;
}

2349 2350 2351
static int btrfs_read_roots(struct btrfs_fs_info *fs_info,
			    struct btrfs_root *tree_root)
{
2352
	struct btrfs_root *root;
2353 2354 2355 2356 2357 2358 2359
	struct btrfs_key location;
	int ret;

	location.objectid = BTRFS_EXTENT_TREE_OBJECTID;
	location.type = BTRFS_ROOT_ITEM_KEY;
	location.offset = 0;

2360 2361 2362 2363 2364
	root = btrfs_read_tree_root(tree_root, &location);
	if (IS_ERR(root))
		return PTR_ERR(root);
	set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
	fs_info->extent_root = root;
2365 2366

	location.objectid = BTRFS_DEV_TREE_OBJECTID;
2367 2368 2369 2370 2371
	root = btrfs_read_tree_root(tree_root, &location);
	if (IS_ERR(root))
		return PTR_ERR(root);
	set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
	fs_info->dev_root = root;
2372 2373 2374
	btrfs_init_devices_late(fs_info);

	location.objectid = BTRFS_CSUM_TREE_OBJECTID;
2375 2376 2377 2378 2379
	root = btrfs_read_tree_root(tree_root, &location);
	if (IS_ERR(root))
		return PTR_ERR(root);
	set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
	fs_info->csum_root = root;
2380 2381

	location.objectid = BTRFS_QUOTA_TREE_OBJECTID;
2382 2383 2384
	root = btrfs_read_tree_root(tree_root, &location);
	if (!IS_ERR(root)) {
		set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
2385 2386
		fs_info->quota_enabled = 1;
		fs_info->pending_quota_state = 1;
2387
		fs_info->quota_root = root;
2388 2389 2390
	}

	location.objectid = BTRFS_UUID_TREE_OBJECTID;
2391 2392 2393
	root = btrfs_read_tree_root(tree_root, &location);
	if (IS_ERR(root)) {
		ret = PTR_ERR(root);
2394 2395 2396
		if (ret != -ENOENT)
			return ret;
	} else {
2397 2398
		set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
		fs_info->uuid_root = root;
2399 2400 2401 2402 2403
	}

	return 0;
}

A
Al Viro 已提交
2404 2405 2406
int open_ctree(struct super_block *sb,
	       struct btrfs_fs_devices *fs_devices,
	       char *options)
2407
{
2408 2409
	u32 sectorsize;
	u32 nodesize;
2410
	u32 stripesize;
2411
	u64 generation;
2412
	u64 features;
2413
	struct btrfs_key location;
2414
	struct buffer_head *bh;
2415
	struct btrfs_super_block *disk_super;
2416
	struct btrfs_fs_info *fs_info = btrfs_sb(sb);
2417
	struct btrfs_root *tree_root;
2418
	struct btrfs_root *chunk_root;
2419
	int ret;
2420
	int err = -EINVAL;
C
Chris Mason 已提交
2421 2422
	int num_backups_tried = 0;
	int backup_index = 0;
2423
	int max_active;
2424

2425
	tree_root = fs_info->tree_root = btrfs_alloc_root(fs_info);
A
Al Viro 已提交
2426
	chunk_root = fs_info->chunk_root = btrfs_alloc_root(fs_info);
2427
	if (!tree_root || !chunk_root) {
C
Chris Mason 已提交
2428 2429 2430
		err = -ENOMEM;
		goto fail;
	}
2431 2432 2433 2434 2435 2436 2437 2438 2439 2440 2441 2442 2443

	ret = init_srcu_struct(&fs_info->subvol_srcu);
	if (ret) {
		err = ret;
		goto fail;
	}

	ret = setup_bdi(fs_info, &fs_info->bdi);
	if (ret) {
		err = ret;
		goto fail_srcu;
	}

2444
	ret = percpu_counter_init(&fs_info->dirty_metadata_bytes, 0, GFP_KERNEL);
2445 2446 2447 2448 2449 2450 2451
	if (ret) {
		err = ret;
		goto fail_bdi;
	}
	fs_info->dirty_metadata_batch = PAGE_CACHE_SIZE *
					(1 + ilog2(nr_cpu_ids));

2452
	ret = percpu_counter_init(&fs_info->delalloc_bytes, 0, GFP_KERNEL);
2453 2454 2455 2456 2457
	if (ret) {
		err = ret;
		goto fail_dirty_metadata_bytes;
	}

2458
	ret = percpu_counter_init(&fs_info->bio_counter, 0, GFP_KERNEL);
2459 2460 2461 2462 2463
	if (ret) {
		err = ret;
		goto fail_delalloc_bytes;
	}

2464 2465 2466
	fs_info->btree_inode = new_inode(sb);
	if (!fs_info->btree_inode) {
		err = -ENOMEM;
2467
		goto fail_bio_counter;
2468 2469
	}

2470
	mapping_set_gfp_mask(fs_info->btree_inode->i_mapping, GFP_NOFS);
2471

2472
	INIT_RADIX_TREE(&fs_info->fs_roots_radix, GFP_ATOMIC);
2473
	INIT_RADIX_TREE(&fs_info->buffer_radix, GFP_ATOMIC);
C
Chris Mason 已提交
2474
	INIT_LIST_HEAD(&fs_info->trans_list);
2475
	INIT_LIST_HEAD(&fs_info->dead_roots);
Y
Yan, Zheng 已提交
2476
	INIT_LIST_HEAD(&fs_info->delayed_iputs);
2477
	INIT_LIST_HEAD(&fs_info->delalloc_roots);
2478
	INIT_LIST_HEAD(&fs_info->caching_block_groups);
2479
	spin_lock_init(&fs_info->delalloc_root_lock);
J
Josef Bacik 已提交
2480
	spin_lock_init(&fs_info->trans_lock);
2481
	spin_lock_init(&fs_info->fs_roots_radix_lock);
Y
Yan, Zheng 已提交
2482
	spin_lock_init(&fs_info->delayed_iput_lock);
C
Chris Mason 已提交
2483
	spin_lock_init(&fs_info->defrag_inodes_lock);
2484
	spin_lock_init(&fs_info->free_chunk_lock);
J
Jan Schmidt 已提交
2485
	spin_lock_init(&fs_info->tree_mod_seq_lock);
2486
	spin_lock_init(&fs_info->super_lock);
J
Josef Bacik 已提交
2487
	spin_lock_init(&fs_info->qgroup_op_lock);
2488
	spin_lock_init(&fs_info->buffer_lock);
2489
	spin_lock_init(&fs_info->unused_bgs_lock);
2490
	mutex_init(&fs_info->unused_bg_unpin_mutex);
J
Jan Schmidt 已提交
2491
	rwlock_init(&fs_info->tree_mod_log_lock);
C
Chris Mason 已提交
2492
	mutex_init(&fs_info->reloc_mutex);
2493
	mutex_init(&fs_info->delalloc_root_mutex);
2494
	seqlock_init(&fs_info->profiles_lock);
2495

2496
	init_completion(&fs_info->kobj_unregister);
2497
	INIT_LIST_HEAD(&fs_info->dirty_cowonly_roots);
2498
	INIT_LIST_HEAD(&fs_info->space_info);
J
Jan Schmidt 已提交
2499
	INIT_LIST_HEAD(&fs_info->tree_mod_seq_list);
2500
	INIT_LIST_HEAD(&fs_info->unused_bgs);
2501
	btrfs_mapping_init(&fs_info->mapping_tree);
2502 2503 2504 2505 2506 2507 2508 2509 2510
	btrfs_init_block_rsv(&fs_info->global_block_rsv,
			     BTRFS_BLOCK_RSV_GLOBAL);
	btrfs_init_block_rsv(&fs_info->delalloc_block_rsv,
			     BTRFS_BLOCK_RSV_DELALLOC);
	btrfs_init_block_rsv(&fs_info->trans_block_rsv, BTRFS_BLOCK_RSV_TRANS);
	btrfs_init_block_rsv(&fs_info->chunk_block_rsv, BTRFS_BLOCK_RSV_CHUNK);
	btrfs_init_block_rsv(&fs_info->empty_block_rsv, BTRFS_BLOCK_RSV_EMPTY);
	btrfs_init_block_rsv(&fs_info->delayed_block_rsv,
			     BTRFS_BLOCK_RSV_DELOPS);
2511
	atomic_set(&fs_info->nr_async_submits, 0);
2512
	atomic_set(&fs_info->async_delalloc_pages, 0);
2513
	atomic_set(&fs_info->async_submit_draining, 0);
2514
	atomic_set(&fs_info->nr_async_bios, 0);
C
Chris Mason 已提交
2515
	atomic_set(&fs_info->defrag_running, 0);
J
Josef Bacik 已提交
2516
	atomic_set(&fs_info->qgroup_op_seq, 0);
2517
	atomic64_set(&fs_info->tree_mod_seq, 0);
C
Chris Mason 已提交
2518
	fs_info->sb = sb;
2519
	fs_info->max_inline = BTRFS_DEFAULT_MAX_INLINE;
J
Josef Bacik 已提交
2520
	fs_info->metadata_ratio = 0;
C
Chris Mason 已提交
2521
	fs_info->defrag_inodes = RB_ROOT;
2522
	fs_info->free_chunk_space = 0;
J
Jan Schmidt 已提交
2523
	fs_info->tree_mod_log = RB_ROOT;
2524
	fs_info->commit_interval = BTRFS_DEFAULT_COMMIT_INTERVAL;
2525
	fs_info->avg_delayed_ref_runtime = NSEC_PER_SEC >> 6; /* div by 64 */
2526 2527 2528
	/* readahead state */
	INIT_RADIX_TREE(&fs_info->reada_tree, GFP_NOFS & ~__GFP_WAIT);
	spin_lock_init(&fs_info->reada_lock);
C
Chris Mason 已提交
2529

2530 2531
	fs_info->thread_pool_size = min_t(unsigned long,
					  num_online_cpus() + 2, 8);
2532

2533 2534
	INIT_LIST_HEAD(&fs_info->ordered_roots);
	spin_lock_init(&fs_info->ordered_root_lock);
2535 2536 2537 2538 2539 2540 2541
	fs_info->delayed_root = kmalloc(sizeof(struct btrfs_delayed_root),
					GFP_NOFS);
	if (!fs_info->delayed_root) {
		err = -ENOMEM;
		goto fail_iput;
	}
	btrfs_init_delayed_root(fs_info->delayed_root);
2542

2543
	btrfs_init_scrub(fs_info);
2544 2545 2546
#ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
	fs_info->check_integrity_print_mask = 0;
#endif
2547
	btrfs_init_balance(fs_info);
2548
	btrfs_init_async_reclaim_work(&fs_info->async_reclaim_work);
A
Arne Jansen 已提交
2549

2550 2551
	sb->s_blocksize = 4096;
	sb->s_blocksize_bits = blksize_bits(4096);
J
Jens Axboe 已提交
2552
	sb->s_bdi = &fs_info->bdi;
2553

2554
	btrfs_init_btree_inode(fs_info, tree_root);
2555

J
Josef Bacik 已提交
2556
	spin_lock_init(&fs_info->block_group_cache_lock);
2557
	fs_info->block_group_cache_tree = RB_ROOT;
2558
	fs_info->first_logical_byte = (u64)-1;
J
Josef Bacik 已提交
2559

2560
	extent_io_tree_init(&fs_info->freed_extents[0],
2561
			     fs_info->btree_inode->i_mapping);
2562
	extent_io_tree_init(&fs_info->freed_extents[1],
2563
			     fs_info->btree_inode->i_mapping);
2564
	fs_info->pinned_extents = &fs_info->freed_extents[0];
2565
	fs_info->do_barriers = 1;
2566

C
Chris Mason 已提交
2567

2568
	mutex_init(&fs_info->ordered_operations_mutex);
2569
	mutex_init(&fs_info->ordered_extent_flush_mutex);
2570
	mutex_init(&fs_info->tree_log_mutex);
2571
	mutex_init(&fs_info->chunk_mutex);
2572 2573
	mutex_init(&fs_info->transaction_kthread_mutex);
	mutex_init(&fs_info->cleaner_mutex);
2574
	mutex_init(&fs_info->volume_mutex);
2575
	init_rwsem(&fs_info->commit_root_sem);
2576
	init_rwsem(&fs_info->cleanup_work_sem);
2577
	init_rwsem(&fs_info->subvol_sem);
S
Stefan Behrens 已提交
2578
	sema_init(&fs_info->uuid_tree_rescan_sem, 1);
2579

2580
	btrfs_init_dev_replace_locks(fs_info);
2581
	btrfs_init_qgroup(fs_info);
2582

2583 2584 2585
	btrfs_init_free_cluster(&fs_info->meta_alloc_cluster);
	btrfs_init_free_cluster(&fs_info->data_alloc_cluster);

2586
	init_waitqueue_head(&fs_info->transaction_throttle);
2587
	init_waitqueue_head(&fs_info->transaction_wait);
S
Sage Weil 已提交
2588
	init_waitqueue_head(&fs_info->transaction_blocked_wait);
2589
	init_waitqueue_head(&fs_info->async_submit_wait);
2590

2591 2592
	INIT_LIST_HEAD(&fs_info->pinned_chunks);

D
David Woodhouse 已提交
2593 2594
	ret = btrfs_alloc_stripe_hash_table(fs_info);
	if (ret) {
2595
		err = ret;
D
David Woodhouse 已提交
2596 2597 2598
		goto fail_alloc;
	}

2599
	__setup_root(4096, 4096, 4096, tree_root,
C
Chris Mason 已提交
2600
		     fs_info, BTRFS_ROOT_TREE_OBJECTID);
2601

2602
	invalidate_bdev(fs_devices->latest_bdev);
D
David Sterba 已提交
2603 2604 2605 2606

	/*
	 * Read super block and check the signature bytes only
	 */
Y
Yan Zheng 已提交
2607
	bh = btrfs_read_dev_super(fs_devices->latest_bdev);
2608 2609
	if (!bh) {
		err = -EINVAL;
2610
		goto fail_alloc;
2611
	}
C
Chris Mason 已提交
2612

D
David Sterba 已提交
2613 2614 2615 2616 2617
	/*
	 * We want to check superblock checksum, the type is stored inside.
	 * Pass the whole disk block of size BTRFS_SUPER_INFO_SIZE (4k).
	 */
	if (btrfs_check_super_csum(bh->b_data)) {
2618
		printk(KERN_ERR "BTRFS: superblock checksum mismatch\n");
D
David Sterba 已提交
2619 2620 2621 2622 2623 2624 2625 2626 2627
		err = -EINVAL;
		goto fail_alloc;
	}

	/*
	 * super_copy is zeroed at allocation time and we never touch the
	 * following bytes up to INFO_SIZE, the checksum is calculated from
	 * the whole block of INFO_SIZE
	 */
2628 2629 2630
	memcpy(fs_info->super_copy, bh->b_data, sizeof(*fs_info->super_copy));
	memcpy(fs_info->super_for_commit, fs_info->super_copy,
	       sizeof(*fs_info->super_for_commit));
2631
	brelse(bh);
2632

2633
	memcpy(fs_info->fsid, fs_info->super_copy->fsid, BTRFS_FSID_SIZE);
2634

D
David Sterba 已提交
2635 2636
	ret = btrfs_check_super_valid(fs_info, sb->s_flags & MS_RDONLY);
	if (ret) {
2637
		printk(KERN_ERR "BTRFS: superblock contains fatal errors\n");
D
David Sterba 已提交
2638 2639 2640 2641
		err = -EINVAL;
		goto fail_alloc;
	}

2642
	disk_super = fs_info->super_copy;
2643
	if (!btrfs_super_root(disk_super))
2644
		goto fail_alloc;
2645

L
liubo 已提交
2646
	/* check FS state, whether FS is broken. */
2647 2648
	if (btrfs_super_flags(disk_super) & BTRFS_SUPER_FLAG_ERROR)
		set_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state);
L
liubo 已提交
2649

C
Chris Mason 已提交
2650 2651 2652 2653 2654 2655 2656
	/*
	 * run through our array of backup supers and setup
	 * our ring pointer to the oldest one
	 */
	generation = btrfs_super_generation(disk_super);
	find_oldest_super_backup(fs_info, generation);

2657 2658 2659 2660 2661 2662
	/*
	 * In the long term, we'll store the compression type in the super
	 * block, and it'll be used for per file compression control.
	 */
	fs_info->compress_type = BTRFS_COMPRESS_ZLIB;

Y
Yan Zheng 已提交
2663 2664 2665
	ret = btrfs_parse_options(tree_root, options);
	if (ret) {
		err = ret;
2666
		goto fail_alloc;
Y
Yan Zheng 已提交
2667
	}
2668

2669 2670 2671 2672 2673
	features = btrfs_super_incompat_flags(disk_super) &
		~BTRFS_FEATURE_INCOMPAT_SUPP;
	if (features) {
		printk(KERN_ERR "BTRFS: couldn't mount because of "
		       "unsupported optional features (%Lx).\n",
2674
		       features);
2675
		err = -EINVAL;
2676
		goto fail_alloc;
2677 2678
	}

2679 2680 2681 2682
	/*
	 * Leafsize and nodesize were always equal, this is only a sanity check.
	 */
	if (le32_to_cpu(disk_super->__unused_leafsize) !=
2683 2684 2685 2686
	    btrfs_super_nodesize(disk_super)) {
		printk(KERN_ERR "BTRFS: couldn't mount because metadata "
		       "blocksizes don't match.  node %d leaf %d\n",
		       btrfs_super_nodesize(disk_super),
2687
		       le32_to_cpu(disk_super->__unused_leafsize));
2688 2689 2690
		err = -EINVAL;
		goto fail_alloc;
	}
2691
	if (btrfs_super_nodesize(disk_super) > BTRFS_MAX_METADATA_BLOCKSIZE) {
2692 2693
		printk(KERN_ERR "BTRFS: couldn't mount because metadata "
		       "blocksize (%d) was too large\n",
2694
		       btrfs_super_nodesize(disk_super));
2695 2696 2697 2698
		err = -EINVAL;
		goto fail_alloc;
	}

2699
	features = btrfs_super_incompat_flags(disk_super);
L
Li Zefan 已提交
2700
	features |= BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF;
L
Li Zefan 已提交
2701
	if (tree_root->fs_info->compress_type == BTRFS_COMPRESS_LZO)
L
Li Zefan 已提交
2702
		features |= BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO;
2703

2704
	if (features & BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA)
2705
		printk(KERN_INFO "BTRFS: has skinny extents\n");
2706

2707 2708 2709 2710
	/*
	 * flag our filesystem as having big metadata blocks if
	 * they are bigger than the page size
	 */
2711
	if (btrfs_super_nodesize(disk_super) > PAGE_CACHE_SIZE) {
2712
		if (!(features & BTRFS_FEATURE_INCOMPAT_BIG_METADATA))
2713
			printk(KERN_INFO "BTRFS: flagging fs with big metadata feature\n");
2714 2715 2716
		features |= BTRFS_FEATURE_INCOMPAT_BIG_METADATA;
	}

2717 2718 2719
	nodesize = btrfs_super_nodesize(disk_super);
	sectorsize = btrfs_super_sectorsize(disk_super);
	stripesize = btrfs_super_stripesize(disk_super);
2720
	fs_info->dirty_metadata_batch = nodesize * (1 + ilog2(nr_cpu_ids));
2721
	fs_info->delalloc_batch = sectorsize * 512 * (1 + ilog2(nr_cpu_ids));
2722 2723 2724 2725 2726 2727

	/*
	 * mixed block groups end up with duplicate but slightly offset
	 * extent buffers for the same range.  It leads to corruptions
	 */
	if ((features & BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS) &&
2728
	    (sectorsize != nodesize)) {
2729
		printk(KERN_ERR "BTRFS: unequal leaf/node/sector sizes "
2730 2731 2732 2733 2734
				"are not allowed for mixed block groups on %s\n",
				sb->s_id);
		goto fail_alloc;
	}

2735 2736 2737 2738
	/*
	 * Needn't use the lock because there is no other task which will
	 * update the flag.
	 */
L
Li Zefan 已提交
2739
	btrfs_set_super_incompat_flags(disk_super, features);
2740

2741 2742 2743 2744 2745
	features = btrfs_super_compat_ro_flags(disk_super) &
		~BTRFS_FEATURE_COMPAT_RO_SUPP;
	if (!(sb->s_flags & MS_RDONLY) && features) {
		printk(KERN_ERR "BTRFS: couldn't mount RDWR because of "
		       "unsupported option features (%Lx).\n",
2746
		       features);
2747
		err = -EINVAL;
2748
		goto fail_alloc;
2749
	}
2750

2751
	max_active = fs_info->thread_pool_size;
2752

2753 2754 2755
	ret = btrfs_init_workqueues(fs_info, fs_devices);
	if (ret) {
		err = ret;
2756 2757
		goto fail_sb_buffer;
	}
2758

2759
	fs_info->bdi.ra_pages *= btrfs_super_num_devices(disk_super);
C
Chris Mason 已提交
2760 2761
	fs_info->bdi.ra_pages = max(fs_info->bdi.ra_pages,
				    4 * 1024 * 1024 / PAGE_CACHE_SIZE);
2762

2763 2764
	tree_root->nodesize = nodesize;
	tree_root->sectorsize = sectorsize;
2765
	tree_root->stripesize = stripesize;
2766 2767 2768

	sb->s_blocksize = sectorsize;
	sb->s_blocksize_bits = blksize_bits(sectorsize);
2769

2770
	if (btrfs_super_magic(disk_super) != BTRFS_MAGIC) {
2771
		printk(KERN_ERR "BTRFS: valid FS not found on %s\n", sb->s_id);
C
Chris Mason 已提交
2772 2773
		goto fail_sb_buffer;
	}
2774

2775
	if (sectorsize != PAGE_SIZE) {
2776
		printk(KERN_ERR "BTRFS: incompatible sector size (%lu) "
2777
		       "found on %s\n", (unsigned long)sectorsize, sb->s_id);
2778 2779 2780
		goto fail_sb_buffer;
	}

2781
	mutex_lock(&fs_info->chunk_mutex);
Y
Yan Zheng 已提交
2782
	ret = btrfs_read_sys_array(tree_root);
2783
	mutex_unlock(&fs_info->chunk_mutex);
2784
	if (ret) {
2785
		printk(KERN_ERR "BTRFS: failed to read the system "
C
Chris Mason 已提交
2786
		       "array on %s\n", sb->s_id);
2787
		goto fail_sb_buffer;
2788
	}
2789

2790
	generation = btrfs_super_chunk_root_generation(disk_super);
2791

2792 2793
	__setup_root(nodesize, sectorsize, stripesize, chunk_root,
		     fs_info, BTRFS_CHUNK_TREE_OBJECTID);
2794 2795 2796

	chunk_root->node = read_tree_block(chunk_root,
					   btrfs_super_chunk_root(disk_super),
2797
					   generation);
2798 2799
	if (!chunk_root->node ||
	    !test_bit(EXTENT_BUFFER_UPTODATE, &chunk_root->node->bflags)) {
2800
		printk(KERN_ERR "BTRFS: failed to read chunk root on %s\n",
2801
		       sb->s_id);
C
Chris Mason 已提交
2802
		goto fail_tree_roots;
2803
	}
2804 2805
	btrfs_set_root_node(&chunk_root->root_item, chunk_root->node);
	chunk_root->commit_root = btrfs_root_node(chunk_root);
2806

2807
	read_extent_buffer(chunk_root->node, fs_info->chunk_tree_uuid,
2808
	   btrfs_header_chunk_tree_uuid(chunk_root->node), BTRFS_UUID_SIZE);
2809

2810
	ret = btrfs_read_chunk_tree(chunk_root);
Y
Yan Zheng 已提交
2811
	if (ret) {
2812
		printk(KERN_ERR "BTRFS: failed to read chunk tree on %s\n",
C
Chris Mason 已提交
2813
		       sb->s_id);
C
Chris Mason 已提交
2814
		goto fail_tree_roots;
Y
Yan Zheng 已提交
2815
	}
2816

2817 2818 2819 2820
	/*
	 * keep the device that is marked to be the target device for the
	 * dev_replace procedure
	 */
2821
	btrfs_close_extra_devices(fs_devices, 0);
2822

2823
	if (!fs_devices->latest_bdev) {
2824
		printk(KERN_ERR "BTRFS: failed to read devices on %s\n",
2825 2826 2827 2828
		       sb->s_id);
		goto fail_tree_roots;
	}

C
Chris Mason 已提交
2829
retry_root_backup:
2830
	generation = btrfs_super_generation(disk_super);
2831

C
Chris Mason 已提交
2832
	tree_root->node = read_tree_block(tree_root,
2833
					  btrfs_super_root(disk_super),
2834
					  generation);
C
Chris Mason 已提交
2835 2836
	if (!tree_root->node ||
	    !test_bit(EXTENT_BUFFER_UPTODATE, &tree_root->node->bflags)) {
2837
		printk(KERN_WARNING "BTRFS: failed to read tree root on %s\n",
2838
		       sb->s_id);
C
Chris Mason 已提交
2839 2840

		goto recovery_tree_root;
2841
	}
C
Chris Mason 已提交
2842

2843 2844
	btrfs_set_root_node(&tree_root->root_item, tree_root->node);
	tree_root->commit_root = btrfs_root_node(tree_root);
2845
	btrfs_set_root_refs(&tree_root->root_item, 1);
2846

2847 2848
	ret = btrfs_read_roots(fs_info, tree_root);
	if (ret)
C
Chris Mason 已提交
2849
		goto recovery_tree_root;
2850

2851 2852 2853
	fs_info->generation = generation;
	fs_info->last_trans_committed = generation;

2854 2855
	ret = btrfs_recover_balance(fs_info);
	if (ret) {
2856
		printk(KERN_ERR "BTRFS: failed to recover balance\n");
2857 2858 2859
		goto fail_block_groups;
	}

2860 2861
	ret = btrfs_init_dev_stats(fs_info);
	if (ret) {
2862
		printk(KERN_ERR "BTRFS: failed to init dev_stats: %d\n",
2863 2864 2865 2866
		       ret);
		goto fail_block_groups;
	}

2867 2868
	ret = btrfs_init_dev_replace(fs_info);
	if (ret) {
2869
		pr_err("BTRFS: failed to init dev_replace: %d\n", ret);
2870 2871 2872
		goto fail_block_groups;
	}

2873
	btrfs_close_extra_devices(fs_devices, 1);
2874

2875
	ret = btrfs_sysfs_add_one(fs_info);
2876
	if (ret) {
2877
		pr_err("BTRFS: failed to init sysfs interface: %d\n", ret);
2878 2879 2880 2881 2882
		goto fail_block_groups;
	}

	ret = btrfs_init_space_info(fs_info);
	if (ret) {
2883
		printk(KERN_ERR "BTRFS: Failed to initial space info: %d\n", ret);
2884
		goto fail_sysfs;
2885 2886
	}

2887
	ret = btrfs_read_block_groups(fs_info->extent_root);
2888
	if (ret) {
2889
		printk(KERN_ERR "BTRFS: Failed to read block groups: %d\n", ret);
2890
		goto fail_sysfs;
2891
	}
2892 2893
	fs_info->num_tolerated_disk_barrier_failures =
		btrfs_calc_num_tolerated_disk_barrier_failures(fs_info);
2894 2895 2896
	if (fs_info->fs_devices->missing_devices >
	     fs_info->num_tolerated_disk_barrier_failures &&
	    !(sb->s_flags & MS_RDONLY)) {
2897 2898
		printk(KERN_WARNING "BTRFS: "
			"too many missing devices, writeable mount is not allowed\n");
2899
		goto fail_sysfs;
2900
	}
C
Chris Mason 已提交
2901

2902 2903
	fs_info->cleaner_kthread = kthread_run(cleaner_kthread, tree_root,
					       "btrfs-cleaner");
2904
	if (IS_ERR(fs_info->cleaner_kthread))
2905
		goto fail_sysfs;
2906 2907 2908 2909

	fs_info->transaction_kthread = kthread_run(transaction_kthread,
						   tree_root,
						   "btrfs-transaction");
2910
	if (IS_ERR(fs_info->transaction_kthread))
2911
		goto fail_cleaner;
2912

C
Chris Mason 已提交
2913 2914 2915
	if (!btrfs_test_opt(tree_root, SSD) &&
	    !btrfs_test_opt(tree_root, NOSSD) &&
	    !fs_info->fs_devices->rotating) {
2916
		printk(KERN_INFO "BTRFS: detected SSD devices, enabling SSD "
C
Chris Mason 已提交
2917 2918 2919 2920
		       "mode\n");
		btrfs_set_opt(fs_info->mount_opt, SSD);
	}

2921 2922 2923 2924 2925
	/*
	 * Mount does not set all options immediatelly, we can do it now and do
	 * not have to wait for transaction commit
	 */
	btrfs_apply_pending_changes(fs_info);
2926

2927 2928 2929 2930 2931 2932 2933 2934
#ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
	if (btrfs_test_opt(tree_root, CHECK_INTEGRITY)) {
		ret = btrfsic_mount(tree_root, fs_devices,
				    btrfs_test_opt(tree_root,
					CHECK_INTEGRITY_INCLUDING_EXTENT_DATA) ?
				    1 : 0,
				    fs_info->check_integrity_print_mask);
		if (ret)
2935
			printk(KERN_WARNING "BTRFS: failed to initialize"
2936 2937 2938
			       " integrity check module %s\n", sb->s_id);
	}
#endif
2939 2940 2941
	ret = btrfs_read_qgroup_config(fs_info);
	if (ret)
		goto fail_trans_kthread;
2942

L
liubo 已提交
2943
	/* do not make disk changes in broken FS */
2944
	if (btrfs_super_log_root(disk_super) != 0) {
2945
		ret = btrfs_replay_log(fs_info, fs_devices);
2946
		if (ret) {
2947
			err = ret;
2948
			goto fail_qgroup;
2949
		}
2950
	}
Z
Zheng Yan 已提交
2951

2952
	ret = btrfs_find_orphan_roots(tree_root);
2953
	if (ret)
2954
		goto fail_qgroup;
2955

2956
	if (!(sb->s_flags & MS_RDONLY)) {
2957
		ret = btrfs_cleanup_fs_roots(fs_info);
2958
		if (ret)
2959
			goto fail_qgroup;
2960

2961
		mutex_lock(&fs_info->cleaner_mutex);
2962
		ret = btrfs_recover_relocation(tree_root);
2963
		mutex_unlock(&fs_info->cleaner_mutex);
2964 2965
		if (ret < 0) {
			printk(KERN_WARNING
2966
			       "BTRFS: failed to recover relocation\n");
2967
			err = -EINVAL;
2968
			goto fail_qgroup;
2969
		}
2970
	}
Z
Zheng Yan 已提交
2971

2972 2973
	location.objectid = BTRFS_FS_TREE_OBJECTID;
	location.type = BTRFS_ROOT_ITEM_KEY;
2974
	location.offset = 0;
2975 2976

	fs_info->fs_root = btrfs_read_fs_root_no_name(fs_info, &location);
2977 2978
	if (IS_ERR(fs_info->fs_root)) {
		err = PTR_ERR(fs_info->fs_root);
2979
		goto fail_qgroup;
2980
	}
C
Chris Mason 已提交
2981

2982 2983
	if (sb->s_flags & MS_RDONLY)
		return 0;
I
Ilya Dryomov 已提交
2984

2985 2986 2987
	down_read(&fs_info->cleanup_work_sem);
	if ((ret = btrfs_orphan_cleanup(fs_info->fs_root)) ||
	    (ret = btrfs_orphan_cleanup(fs_info->tree_root))) {
2988
		up_read(&fs_info->cleanup_work_sem);
2989 2990 2991 2992
		close_ctree(tree_root);
		return ret;
	}
	up_read(&fs_info->cleanup_work_sem);
I
Ilya Dryomov 已提交
2993

2994 2995
	ret = btrfs_resume_balance_async(fs_info);
	if (ret) {
2996
		printk(KERN_WARNING "BTRFS: failed to resume balance\n");
2997 2998
		close_ctree(tree_root);
		return ret;
2999 3000
	}

3001 3002
	ret = btrfs_resume_dev_replace_async(fs_info);
	if (ret) {
3003
		pr_warn("BTRFS: failed to resume dev_replace\n");
3004 3005 3006 3007
		close_ctree(tree_root);
		return ret;
	}

3008 3009
	btrfs_qgroup_rescan_resume(fs_info);

3010
	if (!fs_info->uuid_root) {
3011
		pr_info("BTRFS: creating UUID tree\n");
3012 3013
		ret = btrfs_create_uuid_tree(fs_info);
		if (ret) {
3014
			pr_warn("BTRFS: failed to create the UUID tree %d\n",
3015 3016 3017 3018
				ret);
			close_ctree(tree_root);
			return ret;
		}
3019 3020 3021
	} else if (btrfs_test_opt(tree_root, RESCAN_UUID_TREE) ||
		   fs_info->generation !=
				btrfs_super_uuid_tree_generation(disk_super)) {
3022
		pr_info("BTRFS: checking UUID tree\n");
3023 3024
		ret = btrfs_check_uuid_tree(fs_info);
		if (ret) {
3025
			pr_warn("BTRFS: failed to check the UUID tree %d\n",
3026 3027 3028 3029 3030 3031
				ret);
			close_ctree(tree_root);
			return ret;
		}
	} else {
		fs_info->update_uuid_tree_gen = 1;
3032 3033
	}

3034 3035
	fs_info->open = 1;

A
Al Viro 已提交
3036
	return 0;
C
Chris Mason 已提交
3037

3038 3039
fail_qgroup:
	btrfs_free_qgroup_config(fs_info);
3040 3041
fail_trans_kthread:
	kthread_stop(fs_info->transaction_kthread);
J
Josef Bacik 已提交
3042
	btrfs_cleanup_transaction(fs_info->tree_root);
3043
	btrfs_free_fs_roots(fs_info);
3044
fail_cleaner:
3045
	kthread_stop(fs_info->cleaner_kthread);
3046 3047 3048 3049 3050 3051 3052

	/*
	 * make sure we're done with the btree inode before we stop our
	 * kthreads
	 */
	filemap_write_and_wait(fs_info->btree_inode->i_mapping);

3053 3054 3055
fail_sysfs:
	btrfs_sysfs_remove_one(fs_info);

3056
fail_block_groups:
J
Josef Bacik 已提交
3057
	btrfs_put_block_group_cache(fs_info);
3058
	btrfs_free_block_groups(fs_info);
C
Chris Mason 已提交
3059 3060 3061

fail_tree_roots:
	free_root_pointers(fs_info, 1);
3062
	invalidate_inode_pages2(fs_info->btree_inode->i_mapping);
C
Chris Mason 已提交
3063

C
Chris Mason 已提交
3064
fail_sb_buffer:
L
Liu Bo 已提交
3065
	btrfs_stop_all_workers(fs_info);
3066
fail_alloc:
3067
fail_iput:
3068 3069
	btrfs_mapping_tree_free(&fs_info->mapping_tree);

3070
	iput(fs_info->btree_inode);
3071 3072
fail_bio_counter:
	percpu_counter_destroy(&fs_info->bio_counter);
3073 3074
fail_delalloc_bytes:
	percpu_counter_destroy(&fs_info->delalloc_bytes);
3075 3076
fail_dirty_metadata_bytes:
	percpu_counter_destroy(&fs_info->dirty_metadata_bytes);
3077
fail_bdi:
3078
	bdi_destroy(&fs_info->bdi);
3079 3080
fail_srcu:
	cleanup_srcu_struct(&fs_info->subvol_srcu);
3081
fail:
D
David Woodhouse 已提交
3082
	btrfs_free_stripe_hash_table(fs_info);
3083
	btrfs_close_devices(fs_info->fs_devices);
A
Al Viro 已提交
3084
	return err;
C
Chris Mason 已提交
3085 3086 3087 3088 3089 3090 3091 3092 3093 3094 3095 3096 3097 3098 3099 3100 3101 3102

recovery_tree_root:
	if (!btrfs_test_opt(tree_root, RECOVERY))
		goto fail_tree_roots;

	free_root_pointers(fs_info, 0);

	/* don't use the log in recovery mode, it won't be valid */
	btrfs_set_super_log_root(disk_super, 0);

	/* we can't trust the free space cache either */
	btrfs_set_opt(fs_info->mount_opt, CLEAR_CACHE);

	ret = next_root_backup(fs_info, fs_info->super_copy,
			       &num_backups_tried, &backup_index);
	if (ret == -1)
		goto fail_block_groups;
	goto retry_root_backup;
3103 3104
}

3105 3106 3107 3108 3109
static void btrfs_end_buffer_write_sync(struct buffer_head *bh, int uptodate)
{
	if (uptodate) {
		set_buffer_uptodate(bh);
	} else {
3110 3111 3112
		struct btrfs_device *device = (struct btrfs_device *)
			bh->b_private;

3113
		printk_ratelimited_in_rcu(KERN_WARNING "BTRFS: lost page write due to "
3114 3115
					  "I/O error on %s\n",
					  rcu_str_deref(device->name));
3116 3117 3118
		/* note, we dont' set_buffer_write_io_error because we have
		 * our own ways of dealing with the IO errors
		 */
3119
		clear_buffer_uptodate(bh);
3120
		btrfs_dev_stat_inc_and_print(device, BTRFS_DEV_STAT_WRITE_ERRS);
3121 3122 3123 3124 3125
	}
	unlock_buffer(bh);
	put_bh(bh);
}

Y
Yan Zheng 已提交
3126 3127 3128 3129 3130 3131 3132 3133 3134 3135 3136 3137 3138 3139 3140 3141
struct buffer_head *btrfs_read_dev_super(struct block_device *bdev)
{
	struct buffer_head *bh;
	struct buffer_head *latest = NULL;
	struct btrfs_super_block *super;
	int i;
	u64 transid = 0;
	u64 bytenr;

	/* we would like to check all the supers, but that would make
	 * a btrfs mount succeed after a mkfs from a different FS.
	 * So, we need to add a special mount option to scan for
	 * later supers, using BTRFS_SUPER_MIRROR_MAX instead
	 */
	for (i = 0; i < 1; i++) {
		bytenr = btrfs_sb_offset(i);
3142 3143
		if (bytenr + BTRFS_SUPER_INFO_SIZE >=
					i_size_read(bdev->bd_inode))
Y
Yan Zheng 已提交
3144
			break;
3145 3146
		bh = __bread(bdev, bytenr / 4096,
					BTRFS_SUPER_INFO_SIZE);
Y
Yan Zheng 已提交
3147 3148 3149 3150 3151
		if (!bh)
			continue;

		super = (struct btrfs_super_block *)bh->b_data;
		if (btrfs_super_bytenr(super) != bytenr ||
3152
		    btrfs_super_magic(super) != BTRFS_MAGIC) {
Y
Yan Zheng 已提交
3153 3154 3155 3156 3157 3158 3159 3160 3161 3162 3163 3164 3165 3166 3167
			brelse(bh);
			continue;
		}

		if (!latest || btrfs_super_generation(super) > transid) {
			brelse(latest);
			latest = bh;
			transid = btrfs_super_generation(super);
		} else {
			brelse(bh);
		}
	}
	return latest;
}

3168 3169 3170 3171 3172 3173 3174 3175 3176 3177 3178
/*
 * this should be called twice, once with wait == 0 and
 * once with wait == 1.  When wait == 0 is done, all the buffer heads
 * we write are pinned.
 *
 * They are released when wait == 1 is done.
 * max_mirrors must be the same for both runs, and it indicates how
 * many supers on this one device should be written.
 *
 * max_mirrors == 0 means to write them all.
 */
Y
Yan Zheng 已提交
3179 3180 3181 3182 3183 3184 3185 3186 3187 3188 3189 3190 3191 3192 3193 3194
static int write_dev_supers(struct btrfs_device *device,
			    struct btrfs_super_block *sb,
			    int do_barriers, int wait, int max_mirrors)
{
	struct buffer_head *bh;
	int i;
	int ret;
	int errors = 0;
	u32 crc;
	u64 bytenr;

	if (max_mirrors == 0)
		max_mirrors = BTRFS_SUPER_MIRROR_MAX;

	for (i = 0; i < max_mirrors; i++) {
		bytenr = btrfs_sb_offset(i);
3195 3196
		if (bytenr + BTRFS_SUPER_INFO_SIZE >=
		    device->commit_total_bytes)
Y
Yan Zheng 已提交
3197 3198 3199 3200 3201
			break;

		if (wait) {
			bh = __find_get_block(device->bdev, bytenr / 4096,
					      BTRFS_SUPER_INFO_SIZE);
3202 3203 3204 3205
			if (!bh) {
				errors++;
				continue;
			}
Y
Yan Zheng 已提交
3206
			wait_on_buffer(bh);
3207 3208 3209 3210 3211 3212 3213 3214 3215
			if (!buffer_uptodate(bh))
				errors++;

			/* drop our reference */
			brelse(bh);

			/* drop the reference from the wait == 0 run */
			brelse(bh);
			continue;
Y
Yan Zheng 已提交
3216 3217 3218 3219
		} else {
			btrfs_set_super_bytenr(sb, bytenr);

			crc = ~(u32)0;
3220
			crc = btrfs_csum_data((char *)sb +
Y
Yan Zheng 已提交
3221 3222 3223 3224 3225
					      BTRFS_CSUM_SIZE, crc,
					      BTRFS_SUPER_INFO_SIZE -
					      BTRFS_CSUM_SIZE);
			btrfs_csum_final(crc, sb->csum);

3226 3227 3228 3229
			/*
			 * one reference for us, and we leave it for the
			 * caller
			 */
Y
Yan Zheng 已提交
3230 3231
			bh = __getblk(device->bdev, bytenr / 4096,
				      BTRFS_SUPER_INFO_SIZE);
3232
			if (!bh) {
3233
				printk(KERN_ERR "BTRFS: couldn't get super "
3234 3235 3236 3237 3238
				       "buffer head for bytenr %Lu\n", bytenr);
				errors++;
				continue;
			}

Y
Yan Zheng 已提交
3239 3240
			memcpy(bh->b_data, sb, BTRFS_SUPER_INFO_SIZE);

3241
			/* one reference for submit_bh */
Y
Yan Zheng 已提交
3242
			get_bh(bh);
3243 3244

			set_buffer_uptodate(bh);
Y
Yan Zheng 已提交
3245 3246
			lock_buffer(bh);
			bh->b_end_io = btrfs_end_buffer_write_sync;
3247
			bh->b_private = device;
Y
Yan Zheng 已提交
3248 3249
		}

C
Chris Mason 已提交
3250 3251 3252 3253
		/*
		 * we fua the first super.  The others we allow
		 * to go down lazy.
		 */
3254 3255 3256 3257
		if (i == 0)
			ret = btrfsic_submit_bh(WRITE_FUA, bh);
		else
			ret = btrfsic_submit_bh(WRITE_SYNC, bh);
3258
		if (ret)
Y
Yan Zheng 已提交
3259 3260 3261 3262 3263
			errors++;
	}
	return errors < i ? 0 : -1;
}

C
Chris Mason 已提交
3264 3265 3266 3267 3268 3269 3270 3271 3272 3273 3274 3275 3276 3277 3278 3279 3280 3281 3282 3283 3284 3285 3286 3287 3288 3289 3290 3291 3292 3293 3294 3295 3296 3297 3298 3299 3300 3301 3302
/*
 * endio for the write_dev_flush, this will wake anyone waiting
 * for the barrier when it is done
 */
static void btrfs_end_empty_barrier(struct bio *bio, int err)
{
	if (err) {
		if (err == -EOPNOTSUPP)
			set_bit(BIO_EOPNOTSUPP, &bio->bi_flags);
		clear_bit(BIO_UPTODATE, &bio->bi_flags);
	}
	if (bio->bi_private)
		complete(bio->bi_private);
	bio_put(bio);
}

/*
 * trigger flushes for one the devices.  If you pass wait == 0, the flushes are
 * sent down.  With wait == 1, it waits for the previous flush.
 *
 * any device where the flush fails with eopnotsupp are flagged as not-barrier
 * capable
 */
static int write_dev_flush(struct btrfs_device *device, int wait)
{
	struct bio *bio;
	int ret = 0;

	if (device->nobarriers)
		return 0;

	if (wait) {
		bio = device->flush_bio;
		if (!bio)
			return 0;

		wait_for_completion(&device->flush_wait);

		if (bio_flagged(bio, BIO_EOPNOTSUPP)) {
3303
			printk_in_rcu("BTRFS: disabling barriers on dev %s\n",
3304
				      rcu_str_deref(device->name));
C
Chris Mason 已提交
3305
			device->nobarriers = 1;
3306
		} else if (!bio_flagged(bio, BIO_UPTODATE)) {
C
Chris Mason 已提交
3307
			ret = -EIO;
3308 3309
			btrfs_dev_stat_inc_and_print(device,
				BTRFS_DEV_STAT_FLUSH_ERRS);
C
Chris Mason 已提交
3310 3311 3312 3313 3314 3315 3316 3317 3318 3319 3320 3321 3322
		}

		/* drop the reference from the wait == 0 run */
		bio_put(bio);
		device->flush_bio = NULL;

		return ret;
	}

	/*
	 * one reference for us, and we leave it for the
	 * caller
	 */
3323
	device->flush_bio = NULL;
3324
	bio = btrfs_io_bio_alloc(GFP_NOFS, 0);
C
Chris Mason 已提交
3325 3326 3327 3328 3329 3330 3331 3332 3333 3334
	if (!bio)
		return -ENOMEM;

	bio->bi_end_io = btrfs_end_empty_barrier;
	bio->bi_bdev = device->bdev;
	init_completion(&device->flush_wait);
	bio->bi_private = &device->flush_wait;
	device->flush_bio = bio;

	bio_get(bio);
3335
	btrfsic_submit_bio(WRITE_FLUSH, bio);
C
Chris Mason 已提交
3336 3337 3338 3339 3340 3341 3342 3343 3344 3345 3346 3347

	return 0;
}

/*
 * send an empty flush down to each device in parallel,
 * then wait for them
 */
static int barrier_all_devices(struct btrfs_fs_info *info)
{
	struct list_head *head;
	struct btrfs_device *dev;
3348 3349
	int errors_send = 0;
	int errors_wait = 0;
C
Chris Mason 已提交
3350 3351 3352 3353 3354
	int ret;

	/* send down all the barriers */
	head = &info->fs_devices->devices;
	list_for_each_entry_rcu(dev, head, dev_list) {
3355 3356
		if (dev->missing)
			continue;
C
Chris Mason 已提交
3357
		if (!dev->bdev) {
3358
			errors_send++;
C
Chris Mason 已提交
3359 3360 3361 3362 3363 3364 3365
			continue;
		}
		if (!dev->in_fs_metadata || !dev->writeable)
			continue;

		ret = write_dev_flush(dev, 0);
		if (ret)
3366
			errors_send++;
C
Chris Mason 已提交
3367 3368 3369 3370
	}

	/* wait for all the barriers */
	list_for_each_entry_rcu(dev, head, dev_list) {
3371 3372
		if (dev->missing)
			continue;
C
Chris Mason 已提交
3373
		if (!dev->bdev) {
3374
			errors_wait++;
C
Chris Mason 已提交
3375 3376 3377 3378 3379 3380 3381
			continue;
		}
		if (!dev->in_fs_metadata || !dev->writeable)
			continue;

		ret = write_dev_flush(dev, 1);
		if (ret)
3382
			errors_wait++;
C
Chris Mason 已提交
3383
	}
3384 3385
	if (errors_send > info->num_tolerated_disk_barrier_failures ||
	    errors_wait > info->num_tolerated_disk_barrier_failures)
C
Chris Mason 已提交
3386 3387 3388 3389
		return -EIO;
	return 0;
}

3390 3391 3392 3393 3394 3395 3396 3397 3398 3399 3400 3401 3402 3403 3404 3405 3406 3407 3408 3409 3410 3411 3412 3413 3414 3415 3416 3417 3418 3419 3420 3421 3422 3423 3424 3425 3426 3427 3428 3429 3430 3431 3432 3433 3434 3435 3436 3437 3438 3439 3440 3441 3442 3443 3444 3445 3446 3447 3448 3449
int btrfs_calc_num_tolerated_disk_barrier_failures(
	struct btrfs_fs_info *fs_info)
{
	struct btrfs_ioctl_space_info space;
	struct btrfs_space_info *sinfo;
	u64 types[] = {BTRFS_BLOCK_GROUP_DATA,
		       BTRFS_BLOCK_GROUP_SYSTEM,
		       BTRFS_BLOCK_GROUP_METADATA,
		       BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA};
	int num_types = 4;
	int i;
	int c;
	int num_tolerated_disk_barrier_failures =
		(int)fs_info->fs_devices->num_devices;

	for (i = 0; i < num_types; i++) {
		struct btrfs_space_info *tmp;

		sinfo = NULL;
		rcu_read_lock();
		list_for_each_entry_rcu(tmp, &fs_info->space_info, list) {
			if (tmp->flags == types[i]) {
				sinfo = tmp;
				break;
			}
		}
		rcu_read_unlock();

		if (!sinfo)
			continue;

		down_read(&sinfo->groups_sem);
		for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) {
			if (!list_empty(&sinfo->block_groups[c])) {
				u64 flags;

				btrfs_get_block_group_info(
					&sinfo->block_groups[c], &space);
				if (space.total_bytes == 0 ||
				    space.used_bytes == 0)
					continue;
				flags = space.flags;
				/*
				 * return
				 * 0: if dup, single or RAID0 is configured for
				 *    any of metadata, system or data, else
				 * 1: if RAID5 is configured, or if RAID1 or
				 *    RAID10 is configured and only two mirrors
				 *    are used, else
				 * 2: if RAID6 is configured, else
				 * num_mirrors - 1: if RAID1 or RAID10 is
				 *                  configured and more than
				 *                  2 mirrors are used.
				 */
				if (num_tolerated_disk_barrier_failures > 0 &&
				    ((flags & (BTRFS_BLOCK_GROUP_DUP |
					       BTRFS_BLOCK_GROUP_RAID0)) ||
				     ((flags & BTRFS_BLOCK_GROUP_PROFILE_MASK)
				      == 0)))
					num_tolerated_disk_barrier_failures = 0;
D
David Woodhouse 已提交
3450 3451 3452 3453 3454 3455
				else if (num_tolerated_disk_barrier_failures > 1) {
					if (flags & (BTRFS_BLOCK_GROUP_RAID1 |
					    BTRFS_BLOCK_GROUP_RAID5 |
					    BTRFS_BLOCK_GROUP_RAID10)) {
						num_tolerated_disk_barrier_failures = 1;
					} else if (flags &
3456
						   BTRFS_BLOCK_GROUP_RAID6) {
D
David Woodhouse 已提交
3457 3458 3459
						num_tolerated_disk_barrier_failures = 2;
					}
				}
3460 3461 3462 3463 3464 3465 3466 3467
			}
		}
		up_read(&sinfo->groups_sem);
	}

	return num_tolerated_disk_barrier_failures;
}

3468
static int write_all_supers(struct btrfs_root *root, int max_mirrors)
3469
{
3470
	struct list_head *head;
3471
	struct btrfs_device *dev;
3472
	struct btrfs_super_block *sb;
3473 3474 3475
	struct btrfs_dev_item *dev_item;
	int ret;
	int do_barriers;
3476 3477
	int max_errors;
	int total_errors = 0;
3478
	u64 flags;
3479 3480

	do_barriers = !btrfs_test_opt(root, NOBARRIER);
C
Chris Mason 已提交
3481
	backup_super_roots(root->fs_info);
3482

3483
	sb = root->fs_info->super_for_commit;
3484
	dev_item = &sb->dev_item;
3485

3486
	mutex_lock(&root->fs_info->fs_devices->device_list_mutex);
3487
	head = &root->fs_info->fs_devices->devices;
3488
	max_errors = btrfs_super_num_devices(root->fs_info->super_copy) - 1;
C
Chris Mason 已提交
3489

3490 3491 3492 3493 3494 3495 3496 3497 3498 3499
	if (do_barriers) {
		ret = barrier_all_devices(root->fs_info);
		if (ret) {
			mutex_unlock(
				&root->fs_info->fs_devices->device_list_mutex);
			btrfs_error(root->fs_info, ret,
				    "errors while submitting device barriers.");
			return ret;
		}
	}
C
Chris Mason 已提交
3500

3501
	list_for_each_entry_rcu(dev, head, dev_list) {
3502 3503 3504 3505
		if (!dev->bdev) {
			total_errors++;
			continue;
		}
Y
Yan Zheng 已提交
3506
		if (!dev->in_fs_metadata || !dev->writeable)
3507 3508
			continue;

Y
Yan Zheng 已提交
3509
		btrfs_set_stack_device_generation(dev_item, 0);
3510 3511
		btrfs_set_stack_device_type(dev_item, dev->type);
		btrfs_set_stack_device_id(dev_item, dev->devid);
3512
		btrfs_set_stack_device_total_bytes(dev_item,
3513
						   dev->commit_total_bytes);
3514 3515
		btrfs_set_stack_device_bytes_used(dev_item,
						  dev->commit_bytes_used);
3516 3517 3518 3519
		btrfs_set_stack_device_io_align(dev_item, dev->io_align);
		btrfs_set_stack_device_io_width(dev_item, dev->io_width);
		btrfs_set_stack_device_sector_size(dev_item, dev->sector_size);
		memcpy(dev_item->uuid, dev->uuid, BTRFS_UUID_SIZE);
Y
Yan Zheng 已提交
3520
		memcpy(dev_item->fsid, dev->fs_devices->fsid, BTRFS_UUID_SIZE);
Y
Yan Zheng 已提交
3521

3522 3523 3524
		flags = btrfs_super_flags(sb);
		btrfs_set_super_flags(sb, flags | BTRFS_HEADER_FLAG_WRITTEN);

Y
Yan Zheng 已提交
3525
		ret = write_dev_supers(dev, sb, do_barriers, 0, max_mirrors);
3526 3527
		if (ret)
			total_errors++;
3528
	}
3529
	if (total_errors > max_errors) {
3530
		btrfs_err(root->fs_info, "%d errors while writing supers",
C
Chris Mason 已提交
3531
		       total_errors);
3532
		mutex_unlock(&root->fs_info->fs_devices->device_list_mutex);
3533

3534 3535 3536 3537
		/* FUA is masked off if unsupported and can't be the reason */
		btrfs_error(root->fs_info, -EIO,
			    "%d errors while writing supers", total_errors);
		return -EIO;
3538
	}
3539

Y
Yan Zheng 已提交
3540
	total_errors = 0;
3541
	list_for_each_entry_rcu(dev, head, dev_list) {
3542 3543
		if (!dev->bdev)
			continue;
Y
Yan Zheng 已提交
3544
		if (!dev->in_fs_metadata || !dev->writeable)
3545 3546
			continue;

Y
Yan Zheng 已提交
3547 3548 3549
		ret = write_dev_supers(dev, sb, do_barriers, 1, max_mirrors);
		if (ret)
			total_errors++;
3550
	}
3551
	mutex_unlock(&root->fs_info->fs_devices->device_list_mutex);
3552
	if (total_errors > max_errors) {
3553 3554 3555
		btrfs_error(root->fs_info, -EIO,
			    "%d errors while writing supers", total_errors);
		return -EIO;
3556
	}
3557 3558 3559
	return 0;
}

Y
Yan Zheng 已提交
3560 3561
int write_ctree_super(struct btrfs_trans_handle *trans,
		      struct btrfs_root *root, int max_mirrors)
3562
{
3563
	return write_all_supers(root, max_mirrors);
C
Chris Mason 已提交
3564 3565
}

3566 3567 3568
/* Drop a fs root from the radix tree and free it. */
void btrfs_drop_and_free_fs_root(struct btrfs_fs_info *fs_info,
				  struct btrfs_root *root)
C
Chris Mason 已提交
3569
{
3570
	spin_lock(&fs_info->fs_roots_radix_lock);
C
Chris Mason 已提交
3571 3572
	radix_tree_delete(&fs_info->fs_roots_radix,
			  (unsigned long)root->root_key.objectid);
3573
	spin_unlock(&fs_info->fs_roots_radix_lock);
3574 3575 3576 3577

	if (btrfs_root_refs(&root->root_item) == 0)
		synchronize_srcu(&fs_info->subvol_srcu);

3578
	if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state))
L
Liu Bo 已提交
3579 3580
		btrfs_free_log(NULL, root);

3581 3582 3583 3584
	if (root->free_ino_pinned)
		__btrfs_remove_free_space_cache(root->free_ino_pinned);
	if (root->free_ino_ctl)
		__btrfs_remove_free_space_cache(root->free_ino_ctl);
3585 3586 3587 3588 3589
	free_fs_root(root);
}

static void free_fs_root(struct btrfs_root *root)
{
3590
	iput(root->ino_cache_inode);
3591
	WARN_ON(!RB_EMPTY_ROOT(&root->inode_tree));
3592 3593
	btrfs_free_block_rsv(root, root->orphan_block_rsv);
	root->orphan_block_rsv = NULL;
3594 3595
	if (root->anon_dev)
		free_anon_bdev(root->anon_dev);
3596 3597
	if (root->subv_writers)
		btrfs_free_subvolume_writers(root->subv_writers);
3598 3599
	free_extent_buffer(root->node);
	free_extent_buffer(root->commit_root);
3600 3601
	kfree(root->free_ino_ctl);
	kfree(root->free_ino_pinned);
C
Chris Mason 已提交
3602
	kfree(root->name);
3603
	btrfs_put_fs_root(root);
C
Chris Mason 已提交
3604 3605
}

3606 3607 3608
void btrfs_free_fs_root(struct btrfs_root *root)
{
	free_fs_root(root);
C
Chris Mason 已提交
3609 3610
}

Y
Yan Zheng 已提交
3611
int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info)
C
Chris Mason 已提交
3612
{
Y
Yan Zheng 已提交
3613 3614
	u64 root_objectid = 0;
	struct btrfs_root *gang[8];
3615 3616 3617 3618
	int i = 0;
	int err = 0;
	unsigned int ret = 0;
	int index;
3619

Y
Yan Zheng 已提交
3620
	while (1) {
3621
		index = srcu_read_lock(&fs_info->subvol_srcu);
Y
Yan Zheng 已提交
3622 3623 3624
		ret = radix_tree_gang_lookup(&fs_info->fs_roots_radix,
					     (void **)gang, root_objectid,
					     ARRAY_SIZE(gang));
3625 3626
		if (!ret) {
			srcu_read_unlock(&fs_info->subvol_srcu, index);
Y
Yan Zheng 已提交
3627
			break;
3628
		}
3629
		root_objectid = gang[ret - 1]->root_key.objectid + 1;
3630

Y
Yan Zheng 已提交
3631
		for (i = 0; i < ret; i++) {
3632 3633 3634 3635 3636 3637 3638 3639 3640
			/* Avoid to grab roots in dead_roots */
			if (btrfs_root_refs(&gang[i]->root_item) == 0) {
				gang[i] = NULL;
				continue;
			}
			/* grab all the search result for later use */
			gang[i] = btrfs_grab_fs_root(gang[i]);
		}
		srcu_read_unlock(&fs_info->subvol_srcu, index);
3641

3642 3643 3644
		for (i = 0; i < ret; i++) {
			if (!gang[i])
				continue;
Y
Yan Zheng 已提交
3645
			root_objectid = gang[i]->root_key.objectid;
3646 3647
			err = btrfs_orphan_cleanup(gang[i]);
			if (err)
3648 3649
				break;
			btrfs_put_fs_root(gang[i]);
Y
Yan Zheng 已提交
3650 3651 3652
		}
		root_objectid++;
	}
3653 3654 3655 3656 3657 3658 3659

	/* release the uncleaned roots due to error */
	for (; i < ret; i++) {
		if (gang[i])
			btrfs_put_fs_root(gang[i]);
	}
	return err;
Y
Yan Zheng 已提交
3660
}
3661

Y
Yan Zheng 已提交
3662 3663 3664
int btrfs_commit_super(struct btrfs_root *root)
{
	struct btrfs_trans_handle *trans;
3665

Y
Yan Zheng 已提交
3666
	mutex_lock(&root->fs_info->cleaner_mutex);
Y
Yan, Zheng 已提交
3667
	btrfs_run_delayed_iputs(root);
Y
Yan Zheng 已提交
3668
	mutex_unlock(&root->fs_info->cleaner_mutex);
D
David Sterba 已提交
3669
	wake_up_process(root->fs_info->cleaner_kthread);
3670 3671 3672 3673 3674

	/* wait until ongoing cleanup work done */
	down_write(&root->fs_info->cleanup_work_sem);
	up_write(&root->fs_info->cleanup_work_sem);

3675
	trans = btrfs_join_transaction(root);
3676 3677
	if (IS_ERR(trans))
		return PTR_ERR(trans);
3678
	return btrfs_commit_transaction(trans, root);
Y
Yan Zheng 已提交
3679 3680
}

3681
void close_ctree(struct btrfs_root *root)
Y
Yan Zheng 已提交
3682 3683 3684 3685 3686 3687 3688
{
	struct btrfs_fs_info *fs_info = root->fs_info;
	int ret;

	fs_info->closing = 1;
	smp_mb();

S
Stefan Behrens 已提交
3689 3690 3691 3692 3693
	/* wait for the uuid_scan task to finish */
	down(&fs_info->uuid_tree_rescan_sem);
	/* avoid complains from lockdep et al., set sem back to initial state */
	up(&fs_info->uuid_tree_rescan_sem);

3694
	/* pause restriper - we want to resume on mount */
3695
	btrfs_pause_balance(fs_info);
3696

3697 3698
	btrfs_dev_replace_suspend_for_unmount(fs_info);

3699
	btrfs_scrub_cancel(fs_info);
C
Chris Mason 已提交
3700 3701 3702 3703 3704 3705

	/* wait for any defraggers to finish */
	wait_event(fs_info->transaction_wait,
		   (atomic_read(&fs_info->defrag_running) == 0));

	/* clear out the rbtree of defraggable inodes */
3706
	btrfs_cleanup_defrag_inodes(fs_info);
C
Chris Mason 已提交
3707

3708 3709
	cancel_work_sync(&fs_info->async_reclaim_work);

Y
Yan Zheng 已提交
3710
	if (!(fs_info->sb->s_flags & MS_RDONLY)) {
L
liubo 已提交
3711 3712
		ret = btrfs_commit_super(root);
		if (ret)
3713
			btrfs_err(fs_info, "commit super ret %d", ret);
L
liubo 已提交
3714 3715
	}

3716
	if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state))
3717
		btrfs_error_commit_super(root);
3718

A
Al Viro 已提交
3719 3720
	kthread_stop(fs_info->transaction_kthread);
	kthread_stop(fs_info->cleaner_kthread);
3721

3722 3723 3724
	fs_info->closing = 2;
	smp_mb();

3725
	btrfs_free_qgroup_config(fs_info);
3726

3727
	if (percpu_counter_sum(&fs_info->delalloc_bytes)) {
3728
		btrfs_info(fs_info, "at unmount delalloc count %lld",
3729
		       percpu_counter_sum(&fs_info->delalloc_bytes));
C
Chris Mason 已提交
3730
	}
3731

3732 3733
	btrfs_sysfs_remove_one(fs_info);

3734
	btrfs_free_fs_roots(fs_info);
3735

3736 3737
	btrfs_put_block_group_cache(fs_info);

3738 3739
	btrfs_free_block_groups(fs_info);

3740 3741 3742 3743 3744
	/*
	 * we must make sure there is not any read request to
	 * submit after we stopping all workers.
	 */
	invalidate_inode_pages2(fs_info->btree_inode->i_mapping);
3745 3746
	btrfs_stop_all_workers(fs_info);

3747
	fs_info->open = 0;
3748
	free_root_pointers(fs_info, 1);
3749

3750
	iput(fs_info->btree_inode);
3751

3752 3753 3754 3755 3756
#ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
	if (btrfs_test_opt(root, CHECK_INTEGRITY))
		btrfsic_unmount(root, fs_info->fs_devices);
#endif

3757
	btrfs_close_devices(fs_info->fs_devices);
3758
	btrfs_mapping_tree_free(&fs_info->mapping_tree);
3759

3760
	percpu_counter_destroy(&fs_info->dirty_metadata_bytes);
3761
	percpu_counter_destroy(&fs_info->delalloc_bytes);
3762
	percpu_counter_destroy(&fs_info->bio_counter);
C
Chris Mason 已提交
3763
	bdi_destroy(&fs_info->bdi);
3764
	cleanup_srcu_struct(&fs_info->subvol_srcu);
3765

D
David Woodhouse 已提交
3766 3767
	btrfs_free_stripe_hash_table(fs_info);

3768 3769
	btrfs_free_block_rsv(root, root->orphan_block_rsv);
	root->orphan_block_rsv = NULL;
3770 3771 3772 3773 3774 3775 3776 3777 3778 3779 3780

	lock_chunks(root);
	while (!list_empty(&fs_info->pinned_chunks)) {
		struct extent_map *em;

		em = list_first_entry(&fs_info->pinned_chunks,
				      struct extent_map, list);
		list_del_init(&em->list);
		free_extent_map(em);
	}
	unlock_chunks(root);
3781 3782
}

3783 3784
int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid,
			  int atomic)
3785
{
3786
	int ret;
3787
	struct inode *btree_inode = buf->pages[0]->mapping->host;
3788

3789
	ret = extent_buffer_uptodate(buf);
3790 3791 3792 3793
	if (!ret)
		return ret;

	ret = verify_parent_transid(&BTRFS_I(btree_inode)->io_tree, buf,
3794 3795 3796
				    parent_transid, atomic);
	if (ret == -EAGAIN)
		return ret;
3797
	return !ret;
3798 3799 3800
}

int btrfs_set_buffer_uptodate(struct extent_buffer *buf)
C
Chris Mason 已提交
3801
{
3802
	return set_extent_buffer_uptodate(buf);
3803
}
3804

3805 3806
void btrfs_mark_buffer_dirty(struct extent_buffer *buf)
{
3807
	struct btrfs_root *root;
3808
	u64 transid = btrfs_header_generation(buf);
3809
	int was_dirty;
3810

3811 3812 3813 3814 3815 3816 3817 3818 3819 3820
#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
	/*
	 * This is a fast path so only do this check if we have sanity tests
	 * enabled.  Normal people shouldn't be marking dummy buffers as dirty
	 * outside of the sanity tests.
	 */
	if (unlikely(test_bit(EXTENT_BUFFER_DUMMY, &buf->bflags)))
		return;
#endif
	root = BTRFS_I(buf->pages[0]->mapping->host)->root;
3821
	btrfs_assert_tree_locked(buf);
J
Julia Lawall 已提交
3822 3823
	if (transid != root->fs_info->generation)
		WARN(1, KERN_CRIT "btrfs transid mismatch buffer %llu, "
C
Chris Mason 已提交
3824
		       "found %llu running %llu\n",
3825
			buf->start, transid, root->fs_info->generation);
3826
	was_dirty = set_extent_buffer_dirty(buf);
3827 3828 3829 3830
	if (!was_dirty)
		__percpu_counter_add(&root->fs_info->dirty_metadata_bytes,
				     buf->len,
				     root->fs_info->dirty_metadata_batch);
3831 3832 3833 3834 3835 3836
#ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
	if (btrfs_header_level(buf) == 0 && check_leaf(root, buf)) {
		btrfs_print_leaf(root, buf);
		ASSERT(0);
	}
#endif
3837 3838
}

3839 3840
static void __btrfs_btree_balance_dirty(struct btrfs_root *root,
					int flush_delayed)
3841 3842 3843 3844 3845
{
	/*
	 * looks as though older kernels can get into trouble with
	 * this code, they end up stuck in balance_dirty_pages forever
	 */
3846
	int ret;
3847 3848 3849 3850

	if (current->flags & PF_MEMALLOC)
		return;

3851 3852
	if (flush_delayed)
		btrfs_balance_delayed_items(root);
3853

3854 3855 3856
	ret = percpu_counter_compare(&root->fs_info->dirty_metadata_bytes,
				     BTRFS_DIRTY_METADATA_THRESH);
	if (ret > 0) {
3857 3858
		balance_dirty_pages_ratelimited(
				   root->fs_info->btree_inode->i_mapping);
3859 3860 3861 3862
	}
	return;
}

3863
void btrfs_btree_balance_dirty(struct btrfs_root *root)
C
Chris Mason 已提交
3864
{
3865 3866
	__btrfs_btree_balance_dirty(root, 1);
}
3867

3868 3869 3870
void btrfs_btree_balance_dirty_nodelay(struct btrfs_root *root)
{
	__btrfs_btree_balance_dirty(root, 0);
C
Chris Mason 已提交
3871
}
3872

3873
int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid)
3874
{
3875
	struct btrfs_root *root = BTRFS_I(buf->pages[0]->mapping->host)->root;
3876
	return btree_read_extent_buffer_pages(root, buf, 0, parent_transid);
3877
}
3878

3879
static int btrfs_check_super_valid(struct btrfs_fs_info *fs_info,
L
liubo 已提交
3880 3881
			      int read_only)
{
D
David Sterba 已提交
3882 3883 3884
	struct btrfs_super_block *sb = fs_info->super_copy;
	int ret = 0;

3885 3886 3887
	if (btrfs_super_root_level(sb) >= BTRFS_MAX_LEVEL) {
		printk(KERN_ERR "BTRFS: tree_root level too big: %d >= %d\n",
				btrfs_super_root_level(sb), BTRFS_MAX_LEVEL);
D
David Sterba 已提交
3888 3889
		ret = -EINVAL;
	}
3890 3891 3892
	if (btrfs_super_chunk_root_level(sb) >= BTRFS_MAX_LEVEL) {
		printk(KERN_ERR "BTRFS: chunk_root level too big: %d >= %d\n",
				btrfs_super_chunk_root_level(sb), BTRFS_MAX_LEVEL);
D
David Sterba 已提交
3893 3894
		ret = -EINVAL;
	}
3895 3896 3897
	if (btrfs_super_log_root_level(sb) >= BTRFS_MAX_LEVEL) {
		printk(KERN_ERR "BTRFS: log_root level too big: %d >= %d\n",
				btrfs_super_log_root_level(sb), BTRFS_MAX_LEVEL);
D
David Sterba 已提交
3898 3899 3900
		ret = -EINVAL;
	}

D
David Sterba 已提交
3901
	/*
D
David Sterba 已提交
3902 3903
	 * The common minimum, we don't know if we can trust the nodesize/sectorsize
	 * items yet, they'll be verified later. Issue just a warning.
D
David Sterba 已提交
3904
	 */
3905
	if (!IS_ALIGNED(btrfs_super_root(sb), 4096))
D
David Sterba 已提交
3906
		printk(KERN_WARNING "BTRFS: tree_root block unaligned: %llu\n",
3907
				btrfs_super_root(sb));
3908
	if (!IS_ALIGNED(btrfs_super_chunk_root(sb), 4096))
3909 3910
		printk(KERN_WARNING "BTRFS: chunk_root block unaligned: %llu\n",
				btrfs_super_chunk_root(sb));
3911
	if (!IS_ALIGNED(btrfs_super_log_root(sb), 4096))
3912
		printk(KERN_WARNING "BTRFS: log_root block unaligned: %llu\n",
3913
				btrfs_super_log_root(sb));
D
David Sterba 已提交
3914

3915 3916 3917 3918 3919 3920 3921 3922 3923 3924 3925 3926 3927 3928 3929
	/*
	 * Check the lower bound, the alignment and other constraints are
	 * checked later.
	 */
	if (btrfs_super_nodesize(sb) < 4096) {
		printk(KERN_ERR "BTRFS: nodesize too small: %u < 4096\n",
				btrfs_super_nodesize(sb));
		ret = -EINVAL;
	}
	if (btrfs_super_sectorsize(sb) < 4096) {
		printk(KERN_ERR "BTRFS: sectorsize too small: %u < 4096\n",
				btrfs_super_sectorsize(sb));
		ret = -EINVAL;
	}

D
David Sterba 已提交
3930 3931 3932 3933 3934 3935 3936 3937 3938 3939
	if (memcmp(fs_info->fsid, sb->dev_item.fsid, BTRFS_UUID_SIZE) != 0) {
		printk(KERN_ERR "BTRFS: dev_item UUID does not match fsid: %pU != %pU\n",
				fs_info->fsid, sb->dev_item.fsid);
		ret = -EINVAL;
	}

	/*
	 * Hint to catch really bogus numbers, bitflips or so, more exact checks are
	 * done later
	 */
3940
	if (btrfs_super_num_devices(sb) > (1UL << 31))
D
David Sterba 已提交
3941
		printk(KERN_WARNING "BTRFS: suspicious number of devices: %llu\n",
3942
				btrfs_super_num_devices(sb));
3943 3944 3945 3946
	if (btrfs_super_num_devices(sb) == 0) {
		printk(KERN_ERR "BTRFS: number of devices is 0\n");
		ret = -EINVAL;
	}
D
David Sterba 已提交
3947

3948
	if (btrfs_super_bytenr(sb) != BTRFS_SUPER_INFO_OFFSET) {
D
David Sterba 已提交
3949
		printk(KERN_ERR "BTRFS: super offset mismatch %llu != %u\n",
3950
				btrfs_super_bytenr(sb), BTRFS_SUPER_INFO_OFFSET);
D
David Sterba 已提交
3951 3952 3953
		ret = -EINVAL;
	}

3954 3955 3956 3957 3958 3959 3960 3961 3962 3963 3964 3965
	/*
	 * Obvious sys_chunk_array corruptions, it must hold at least one key
	 * and one chunk
	 */
	if (btrfs_super_sys_array_size(sb) > BTRFS_SYSTEM_CHUNK_ARRAY_SIZE) {
		printk(KERN_ERR "BTRFS: system chunk array too big %u > %u\n",
				btrfs_super_sys_array_size(sb),
				BTRFS_SYSTEM_CHUNK_ARRAY_SIZE);
		ret = -EINVAL;
	}
	if (btrfs_super_sys_array_size(sb) < sizeof(struct btrfs_disk_key)
			+ sizeof(struct btrfs_chunk)) {
3966
		printk(KERN_ERR "BTRFS: system chunk array too small %u < %zu\n",
3967 3968 3969 3970 3971 3972
				btrfs_super_sys_array_size(sb),
				sizeof(struct btrfs_disk_key)
				+ sizeof(struct btrfs_chunk));
		ret = -EINVAL;
	}

D
David Sterba 已提交
3973 3974 3975 3976
	/*
	 * The generation is a global counter, we'll trust it more than the others
	 * but it's still possible that it's the one that's wrong.
	 */
3977
	if (btrfs_super_generation(sb) < btrfs_super_chunk_root_generation(sb))
D
David Sterba 已提交
3978 3979
		printk(KERN_WARNING
			"BTRFS: suspicious: generation < chunk_root_generation: %llu < %llu\n",
3980 3981 3982
			btrfs_super_generation(sb), btrfs_super_chunk_root_generation(sb));
	if (btrfs_super_generation(sb) < btrfs_super_cache_generation(sb)
	    && btrfs_super_cache_generation(sb) != (u64)-1)
D
David Sterba 已提交
3983 3984
		printk(KERN_WARNING
			"BTRFS: suspicious: generation < cache_generation: %llu < %llu\n",
3985
			btrfs_super_generation(sb), btrfs_super_cache_generation(sb));
D
David Sterba 已提交
3986 3987

	return ret;
L
liubo 已提交
3988 3989
}

3990
static void btrfs_error_commit_super(struct btrfs_root *root)
L
liubo 已提交
3991 3992 3993 3994 3995 3996 3997 3998 3999 4000 4001 4002
{
	mutex_lock(&root->fs_info->cleaner_mutex);
	btrfs_run_delayed_iputs(root);
	mutex_unlock(&root->fs_info->cleaner_mutex);

	down_write(&root->fs_info->cleanup_work_sem);
	up_write(&root->fs_info->cleanup_work_sem);

	/* cleanup FS via transaction */
	btrfs_cleanup_transaction(root);
}

4003
static void btrfs_destroy_ordered_extents(struct btrfs_root *root)
L
liubo 已提交
4004 4005 4006
{
	struct btrfs_ordered_extent *ordered;

4007
	spin_lock(&root->ordered_extent_lock);
4008 4009 4010 4011
	/*
	 * This will just short circuit the ordered completion stuff which will
	 * make sure the ordered extent gets properly cleaned up.
	 */
4012
	list_for_each_entry(ordered, &root->ordered_extents,
4013 4014
			    root_extent_list)
		set_bit(BTRFS_ORDERED_IOERR, &ordered->flags);
4015 4016 4017 4018 4019 4020 4021 4022 4023 4024 4025 4026 4027 4028 4029
	spin_unlock(&root->ordered_extent_lock);
}

static void btrfs_destroy_all_ordered_extents(struct btrfs_fs_info *fs_info)
{
	struct btrfs_root *root;
	struct list_head splice;

	INIT_LIST_HEAD(&splice);

	spin_lock(&fs_info->ordered_root_lock);
	list_splice_init(&fs_info->ordered_roots, &splice);
	while (!list_empty(&splice)) {
		root = list_first_entry(&splice, struct btrfs_root,
					ordered_root);
4030 4031
		list_move_tail(&root->ordered_root,
			       &fs_info->ordered_roots);
4032

4033
		spin_unlock(&fs_info->ordered_root_lock);
4034 4035
		btrfs_destroy_ordered_extents(root);

4036 4037
		cond_resched();
		spin_lock(&fs_info->ordered_root_lock);
4038 4039
	}
	spin_unlock(&fs_info->ordered_root_lock);
L
liubo 已提交
4040 4041
}

4042 4043
static int btrfs_destroy_delayed_refs(struct btrfs_transaction *trans,
				      struct btrfs_root *root)
L
liubo 已提交
4044 4045 4046 4047 4048 4049 4050 4051 4052
{
	struct rb_node *node;
	struct btrfs_delayed_ref_root *delayed_refs;
	struct btrfs_delayed_ref_node *ref;
	int ret = 0;

	delayed_refs = &trans->delayed_refs;

	spin_lock(&delayed_refs->lock);
4053
	if (atomic_read(&delayed_refs->num_entries) == 0) {
4054
		spin_unlock(&delayed_refs->lock);
4055
		btrfs_info(root->fs_info, "delayed_refs has NO entry");
L
liubo 已提交
4056 4057 4058
		return ret;
	}

4059 4060
	while ((node = rb_first(&delayed_refs->href_root)) != NULL) {
		struct btrfs_delayed_ref_head *head;
4061
		bool pin_bytes = false;
L
liubo 已提交
4062

4063 4064 4065 4066 4067
		head = rb_entry(node, struct btrfs_delayed_ref_head,
				href_node);
		if (!mutex_trylock(&head->mutex)) {
			atomic_inc(&head->node.refs);
			spin_unlock(&delayed_refs->lock);
4068

4069
			mutex_lock(&head->mutex);
4070
			mutex_unlock(&head->mutex);
4071 4072 4073 4074 4075 4076 4077 4078 4079 4080 4081 4082
			btrfs_put_delayed_ref(&head->node);
			spin_lock(&delayed_refs->lock);
			continue;
		}
		spin_lock(&head->lock);
		while ((node = rb_first(&head->ref_root)) != NULL) {
			ref = rb_entry(node, struct btrfs_delayed_ref_node,
				       rb_node);
			ref->in_tree = 0;
			rb_erase(&ref->rb_node, &head->ref_root);
			atomic_dec(&delayed_refs->num_entries);
			btrfs_put_delayed_ref(ref);
4083
		}
4084 4085 4086 4087 4088 4089 4090 4091 4092 4093 4094 4095
		if (head->must_insert_reserved)
			pin_bytes = true;
		btrfs_free_delayed_extent_op(head->extent_op);
		delayed_refs->num_heads--;
		if (head->processing == 0)
			delayed_refs->num_heads_ready--;
		atomic_dec(&delayed_refs->num_entries);
		head->node.in_tree = 0;
		rb_erase(&head->href_node, &delayed_refs->href_root);
		spin_unlock(&head->lock);
		spin_unlock(&delayed_refs->lock);
		mutex_unlock(&head->mutex);
L
liubo 已提交
4096

4097 4098 4099 4100
		if (pin_bytes)
			btrfs_pin_extent(root, head->node.bytenr,
					 head->node.num_bytes, 1);
		btrfs_put_delayed_ref(&head->node);
L
liubo 已提交
4101 4102 4103 4104 4105 4106 4107 4108 4109
		cond_resched();
		spin_lock(&delayed_refs->lock);
	}

	spin_unlock(&delayed_refs->lock);

	return ret;
}

4110
static void btrfs_destroy_delalloc_inodes(struct btrfs_root *root)
L
liubo 已提交
4111 4112 4113 4114 4115 4116
{
	struct btrfs_inode *btrfs_inode;
	struct list_head splice;

	INIT_LIST_HEAD(&splice);

4117 4118
	spin_lock(&root->delalloc_lock);
	list_splice_init(&root->delalloc_inodes, &splice);
L
liubo 已提交
4119 4120

	while (!list_empty(&splice)) {
4121 4122
		btrfs_inode = list_first_entry(&splice, struct btrfs_inode,
					       delalloc_inodes);
L
liubo 已提交
4123 4124

		list_del_init(&btrfs_inode->delalloc_inodes);
4125 4126
		clear_bit(BTRFS_INODE_IN_DELALLOC_LIST,
			  &btrfs_inode->runtime_flags);
4127
		spin_unlock(&root->delalloc_lock);
L
liubo 已提交
4128 4129

		btrfs_invalidate_inodes(btrfs_inode->root);
4130

4131
		spin_lock(&root->delalloc_lock);
L
liubo 已提交
4132 4133
	}

4134 4135 4136 4137 4138 4139 4140 4141 4142 4143 4144 4145 4146 4147 4148 4149 4150 4151 4152 4153 4154 4155 4156 4157 4158 4159
	spin_unlock(&root->delalloc_lock);
}

static void btrfs_destroy_all_delalloc_inodes(struct btrfs_fs_info *fs_info)
{
	struct btrfs_root *root;
	struct list_head splice;

	INIT_LIST_HEAD(&splice);

	spin_lock(&fs_info->delalloc_root_lock);
	list_splice_init(&fs_info->delalloc_roots, &splice);
	while (!list_empty(&splice)) {
		root = list_first_entry(&splice, struct btrfs_root,
					 delalloc_root);
		list_del_init(&root->delalloc_root);
		root = btrfs_grab_fs_root(root);
		BUG_ON(!root);
		spin_unlock(&fs_info->delalloc_root_lock);

		btrfs_destroy_delalloc_inodes(root);
		btrfs_put_fs_root(root);

		spin_lock(&fs_info->delalloc_root_lock);
	}
	spin_unlock(&fs_info->delalloc_root_lock);
L
liubo 已提交
4160 4161 4162 4163 4164 4165 4166 4167 4168 4169 4170 4171 4172
}

static int btrfs_destroy_marked_extents(struct btrfs_root *root,
					struct extent_io_tree *dirty_pages,
					int mark)
{
	int ret;
	struct extent_buffer *eb;
	u64 start = 0;
	u64 end;

	while (1) {
		ret = find_first_extent_bit(dirty_pages, start, &start, &end,
4173
					    mark, NULL);
L
liubo 已提交
4174 4175 4176 4177 4178
		if (ret)
			break;

		clear_extent_bits(dirty_pages, start, end, mark, GFP_NOFS);
		while (start <= end) {
4179
			eb = btrfs_find_tree_block(root->fs_info, start);
4180
			start += root->nodesize;
4181
			if (!eb)
L
liubo 已提交
4182
				continue;
4183
			wait_on_extent_buffer_writeback(eb);
L
liubo 已提交
4184

4185 4186 4187 4188
			if (test_and_clear_bit(EXTENT_BUFFER_DIRTY,
					       &eb->bflags))
				clear_extent_buffer_dirty(eb);
			free_extent_buffer_stale(eb);
L
liubo 已提交
4189 4190 4191 4192 4193 4194 4195 4196 4197 4198 4199 4200 4201
		}
	}

	return ret;
}

static int btrfs_destroy_pinned_extent(struct btrfs_root *root,
				       struct extent_io_tree *pinned_extents)
{
	struct extent_io_tree *unpin;
	u64 start;
	u64 end;
	int ret;
4202
	bool loop = true;
L
liubo 已提交
4203 4204

	unpin = pinned_extents;
4205
again:
L
liubo 已提交
4206 4207
	while (1) {
		ret = find_first_extent_bit(unpin, 0, &start, &end,
4208
					    EXTENT_DIRTY, NULL);
L
liubo 已提交
4209 4210 4211 4212 4213 4214 4215 4216
		if (ret)
			break;

		clear_extent_dirty(unpin, start, end, GFP_NOFS);
		btrfs_error_unpin_extent_range(root, start, end);
		cond_resched();
	}

4217 4218 4219 4220 4221 4222 4223 4224 4225
	if (loop) {
		if (unpin == &root->fs_info->freed_extents[0])
			unpin = &root->fs_info->freed_extents[1];
		else
			unpin = &root->fs_info->freed_extents[0];
		loop = false;
		goto again;
	}

L
liubo 已提交
4226 4227 4228
	return 0;
}

4229 4230 4231 4232 4233 4234 4235 4236 4237 4238 4239 4240 4241 4242 4243 4244 4245 4246 4247
static void btrfs_free_pending_ordered(struct btrfs_transaction *cur_trans,
				       struct btrfs_fs_info *fs_info)
{
	struct btrfs_ordered_extent *ordered;

	spin_lock(&fs_info->trans_lock);
	while (!list_empty(&cur_trans->pending_ordered)) {
		ordered = list_first_entry(&cur_trans->pending_ordered,
					   struct btrfs_ordered_extent,
					   trans_list);
		list_del_init(&ordered->trans_list);
		spin_unlock(&fs_info->trans_lock);

		btrfs_put_ordered_extent(ordered);
		spin_lock(&fs_info->trans_lock);
	}
	spin_unlock(&fs_info->trans_lock);
}

4248 4249 4250 4251 4252
void btrfs_cleanup_one_transaction(struct btrfs_transaction *cur_trans,
				   struct btrfs_root *root)
{
	btrfs_destroy_delayed_refs(cur_trans, root);

4253
	cur_trans->state = TRANS_STATE_COMMIT_START;
4254
	wake_up(&root->fs_info->transaction_blocked_wait);
4255

4256
	cur_trans->state = TRANS_STATE_UNBLOCKED;
4257
	wake_up(&root->fs_info->transaction_wait);
4258

4259
	btrfs_free_pending_ordered(cur_trans, root->fs_info);
4260 4261
	btrfs_destroy_delayed_inodes(root);
	btrfs_assert_delayed_root_empty(root);
4262 4263 4264

	btrfs_destroy_marked_extents(root, &cur_trans->dirty_pages,
				     EXTENT_DIRTY);
4265 4266
	btrfs_destroy_pinned_extent(root,
				    root->fs_info->pinned_extents);
4267

4268 4269 4270
	cur_trans->state =TRANS_STATE_COMPLETED;
	wake_up(&cur_trans->commit_wait);

4271 4272 4273 4274 4275 4276
	/*
	memset(cur_trans, 0, sizeof(*cur_trans));
	kmem_cache_free(btrfs_transaction_cachep, cur_trans);
	*/
}

4277
static int btrfs_cleanup_transaction(struct btrfs_root *root)
L
liubo 已提交
4278 4279 4280 4281 4282
{
	struct btrfs_transaction *t;

	mutex_lock(&root->fs_info->transaction_kthread_mutex);

J
Josef Bacik 已提交
4283
	spin_lock(&root->fs_info->trans_lock);
4284 4285 4286 4287 4288 4289 4290 4291 4292 4293 4294 4295 4296 4297 4298 4299 4300 4301 4302 4303 4304 4305 4306 4307
	while (!list_empty(&root->fs_info->trans_list)) {
		t = list_first_entry(&root->fs_info->trans_list,
				     struct btrfs_transaction, list);
		if (t->state >= TRANS_STATE_COMMIT_START) {
			atomic_inc(&t->use_count);
			spin_unlock(&root->fs_info->trans_lock);
			btrfs_wait_for_commit(root, t->transid);
			btrfs_put_transaction(t);
			spin_lock(&root->fs_info->trans_lock);
			continue;
		}
		if (t == root->fs_info->running_transaction) {
			t->state = TRANS_STATE_COMMIT_DOING;
			spin_unlock(&root->fs_info->trans_lock);
			/*
			 * We wait for 0 num_writers since we don't hold a trans
			 * handle open currently for this transaction.
			 */
			wait_event(t->writer_wait,
				   atomic_read(&t->num_writers) == 0);
		} else {
			spin_unlock(&root->fs_info->trans_lock);
		}
		btrfs_cleanup_one_transaction(t, root);
4308

4309 4310 4311
		spin_lock(&root->fs_info->trans_lock);
		if (t == root->fs_info->running_transaction)
			root->fs_info->running_transaction = NULL;
L
liubo 已提交
4312
		list_del_init(&t->list);
4313
		spin_unlock(&root->fs_info->trans_lock);
L
liubo 已提交
4314

4315 4316 4317 4318 4319 4320 4321 4322 4323 4324
		btrfs_put_transaction(t);
		trace_btrfs_transaction_commit(root);
		spin_lock(&root->fs_info->trans_lock);
	}
	spin_unlock(&root->fs_info->trans_lock);
	btrfs_destroy_all_ordered_extents(root->fs_info);
	btrfs_destroy_delayed_inodes(root);
	btrfs_assert_delayed_root_empty(root);
	btrfs_destroy_pinned_extent(root, root->fs_info->pinned_extents);
	btrfs_destroy_all_delalloc_inodes(root->fs_info);
L
liubo 已提交
4325 4326 4327 4328 4329
	mutex_unlock(&root->fs_info->transaction_kthread_mutex);

	return 0;
}

4330
static const struct extent_io_ops btree_extent_io_ops = {
4331
	.readpage_end_io_hook = btree_readpage_end_io_hook,
A
Arne Jansen 已提交
4332
	.readpage_io_failed_hook = btree_io_failed_hook,
4333
	.submit_bio_hook = btree_submit_bio_hook,
4334 4335
	/* note we're sharing with inode.c for the merge bio hook */
	.merge_bio_hook = btrfs_merge_bio_hook,
4336
};