5252 lines
144 KiB
C
5252 lines
144 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2007 Oracle. All rights reserved.
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*/
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#include <linux/fs.h>
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#include <linux/blkdev.h>
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#include <linux/radix-tree.h>
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#include <linux/writeback.h>
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#include <linux/workqueue.h>
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#include <linux/kthread.h>
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#include <linux/slab.h>
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#include <linux/migrate.h>
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#include <linux/ratelimit.h>
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#include <linux/uuid.h>
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#include <linux/semaphore.h>
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#include <linux/error-injection.h>
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#include <linux/crc32c.h>
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#include <linux/sched/mm.h>
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#include <asm/unaligned.h>
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#include <crypto/hash.h>
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#include "ctree.h"
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#include "disk-io.h"
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#include "transaction.h"
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#include "btrfs_inode.h"
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#include "volumes.h"
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#include "print-tree.h"
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#include "locking.h"
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#include "tree-log.h"
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#include "free-space-cache.h"
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#include "free-space-tree.h"
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#include "check-integrity.h"
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#include "rcu-string.h"
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#include "dev-replace.h"
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#include "raid56.h"
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#include "sysfs.h"
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#include "qgroup.h"
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#include "compression.h"
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#include "tree-checker.h"
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#include "ref-verify.h"
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#include "block-group.h"
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#include "discard.h"
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#include "space-info.h"
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#include "zoned.h"
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#include "subpage.h"
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#define BTRFS_SUPER_FLAG_SUPP (BTRFS_HEADER_FLAG_WRITTEN |\
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BTRFS_HEADER_FLAG_RELOC |\
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BTRFS_SUPER_FLAG_ERROR |\
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BTRFS_SUPER_FLAG_SEEDING |\
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BTRFS_SUPER_FLAG_METADUMP |\
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BTRFS_SUPER_FLAG_METADUMP_V2)
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static void end_workqueue_fn(struct btrfs_work *work);
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static void btrfs_destroy_ordered_extents(struct btrfs_root *root);
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static int btrfs_destroy_delayed_refs(struct btrfs_transaction *trans,
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struct btrfs_fs_info *fs_info);
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static void btrfs_destroy_delalloc_inodes(struct btrfs_root *root);
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static int btrfs_destroy_marked_extents(struct btrfs_fs_info *fs_info,
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struct extent_io_tree *dirty_pages,
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int mark);
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static int btrfs_destroy_pinned_extent(struct btrfs_fs_info *fs_info,
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struct extent_io_tree *pinned_extents);
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static int btrfs_cleanup_transaction(struct btrfs_fs_info *fs_info);
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static void btrfs_error_commit_super(struct btrfs_fs_info *fs_info);
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/*
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* btrfs_end_io_wq structs are used to do processing in task context when an IO
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* is complete. This is used during reads to verify checksums, and it is used
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* by writes to insert metadata for new file extents after IO is complete.
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*/
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struct btrfs_end_io_wq {
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struct bio *bio;
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bio_end_io_t *end_io;
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void *private;
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struct btrfs_fs_info *info;
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blk_status_t status;
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enum btrfs_wq_endio_type metadata;
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struct btrfs_work work;
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};
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static struct kmem_cache *btrfs_end_io_wq_cache;
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int __init btrfs_end_io_wq_init(void)
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{
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btrfs_end_io_wq_cache = kmem_cache_create("btrfs_end_io_wq",
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sizeof(struct btrfs_end_io_wq),
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0,
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SLAB_MEM_SPREAD,
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NULL);
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if (!btrfs_end_io_wq_cache)
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return -ENOMEM;
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return 0;
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}
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void __cold btrfs_end_io_wq_exit(void)
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{
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kmem_cache_destroy(btrfs_end_io_wq_cache);
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}
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static void btrfs_free_csum_hash(struct btrfs_fs_info *fs_info)
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{
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if (fs_info->csum_shash)
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crypto_free_shash(fs_info->csum_shash);
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}
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/*
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* async submit bios are used to offload expensive checksumming
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* onto the worker threads. They checksum file and metadata bios
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* just before they are sent down the IO stack.
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*/
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struct async_submit_bio {
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struct inode *inode;
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struct bio *bio;
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extent_submit_bio_start_t *submit_bio_start;
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int mirror_num;
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/* Optional parameter for submit_bio_start used by direct io */
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u64 dio_file_offset;
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struct btrfs_work work;
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blk_status_t status;
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};
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/*
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* Lockdep class keys for extent_buffer->lock's in this root. For a given
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* eb, the lockdep key is determined by the btrfs_root it belongs to and
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* the level the eb occupies in the tree.
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*
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* Different roots are used for different purposes and may nest inside each
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* other and they require separate keysets. As lockdep keys should be
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* static, assign keysets according to the purpose of the root as indicated
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* by btrfs_root->root_key.objectid. This ensures that all special purpose
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* roots have separate keysets.
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*
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* Lock-nesting across peer nodes is always done with the immediate parent
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* node locked thus preventing deadlock. As lockdep doesn't know this, use
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* subclass to avoid triggering lockdep warning in such cases.
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*
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* The key is set by the readpage_end_io_hook after the buffer has passed
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* csum validation but before the pages are unlocked. It is also set by
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* btrfs_init_new_buffer on freshly allocated blocks.
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*
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* We also add a check to make sure the highest level of the tree is the
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* same as our lockdep setup here. If BTRFS_MAX_LEVEL changes, this code
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* needs update as well.
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*/
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#ifdef CONFIG_DEBUG_LOCK_ALLOC
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# if BTRFS_MAX_LEVEL != 8
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# error
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# endif
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#define DEFINE_LEVEL(stem, level) \
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.names[level] = "btrfs-" stem "-0" #level,
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#define DEFINE_NAME(stem) \
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DEFINE_LEVEL(stem, 0) \
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DEFINE_LEVEL(stem, 1) \
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DEFINE_LEVEL(stem, 2) \
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DEFINE_LEVEL(stem, 3) \
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DEFINE_LEVEL(stem, 4) \
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DEFINE_LEVEL(stem, 5) \
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DEFINE_LEVEL(stem, 6) \
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DEFINE_LEVEL(stem, 7)
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static struct btrfs_lockdep_keyset {
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u64 id; /* root objectid */
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/* Longest entry: btrfs-free-space-00 */
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char names[BTRFS_MAX_LEVEL][20];
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struct lock_class_key keys[BTRFS_MAX_LEVEL];
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} btrfs_lockdep_keysets[] = {
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{ .id = BTRFS_ROOT_TREE_OBJECTID, DEFINE_NAME("root") },
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{ .id = BTRFS_EXTENT_TREE_OBJECTID, DEFINE_NAME("extent") },
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{ .id = BTRFS_CHUNK_TREE_OBJECTID, DEFINE_NAME("chunk") },
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{ .id = BTRFS_DEV_TREE_OBJECTID, DEFINE_NAME("dev") },
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{ .id = BTRFS_CSUM_TREE_OBJECTID, DEFINE_NAME("csum") },
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{ .id = BTRFS_QUOTA_TREE_OBJECTID, DEFINE_NAME("quota") },
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{ .id = BTRFS_TREE_LOG_OBJECTID, DEFINE_NAME("log") },
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{ .id = BTRFS_TREE_RELOC_OBJECTID, DEFINE_NAME("treloc") },
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{ .id = BTRFS_DATA_RELOC_TREE_OBJECTID, DEFINE_NAME("dreloc") },
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{ .id = BTRFS_UUID_TREE_OBJECTID, DEFINE_NAME("uuid") },
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{ .id = BTRFS_FREE_SPACE_TREE_OBJECTID, DEFINE_NAME("free-space") },
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{ .id = 0, DEFINE_NAME("tree") },
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};
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#undef DEFINE_LEVEL
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#undef DEFINE_NAME
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void btrfs_set_buffer_lockdep_class(u64 objectid, struct extent_buffer *eb,
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int level)
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{
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struct btrfs_lockdep_keyset *ks;
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BUG_ON(level >= ARRAY_SIZE(ks->keys));
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/* find the matching keyset, id 0 is the default entry */
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for (ks = btrfs_lockdep_keysets; ks->id; ks++)
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if (ks->id == objectid)
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break;
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lockdep_set_class_and_name(&eb->lock,
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&ks->keys[level], ks->names[level]);
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}
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#endif
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/*
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* Compute the csum of a btree block and store the result to provided buffer.
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*/
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static void csum_tree_block(struct extent_buffer *buf, u8 *result)
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{
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struct btrfs_fs_info *fs_info = buf->fs_info;
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const int num_pages = num_extent_pages(buf);
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const int first_page_part = min_t(u32, PAGE_SIZE, fs_info->nodesize);
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SHASH_DESC_ON_STACK(shash, fs_info->csum_shash);
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char *kaddr;
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int i;
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shash->tfm = fs_info->csum_shash;
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crypto_shash_init(shash);
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kaddr = page_address(buf->pages[0]) + offset_in_page(buf->start);
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crypto_shash_update(shash, kaddr + BTRFS_CSUM_SIZE,
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first_page_part - BTRFS_CSUM_SIZE);
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for (i = 1; i < num_pages; i++) {
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kaddr = page_address(buf->pages[i]);
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crypto_shash_update(shash, kaddr, PAGE_SIZE);
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}
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memset(result, 0, BTRFS_CSUM_SIZE);
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crypto_shash_final(shash, result);
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}
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/*
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* we can't consider a given block up to date unless the transid of the
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* block matches the transid in the parent node's pointer. This is how we
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* detect blocks that either didn't get written at all or got written
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* in the wrong place.
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*/
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static int verify_parent_transid(struct extent_io_tree *io_tree,
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struct extent_buffer *eb, u64 parent_transid,
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int atomic)
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{
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struct extent_state *cached_state = NULL;
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int ret;
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if (!parent_transid || btrfs_header_generation(eb) == parent_transid)
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return 0;
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if (atomic)
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return -EAGAIN;
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lock_extent_bits(io_tree, eb->start, eb->start + eb->len - 1,
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&cached_state);
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if (extent_buffer_uptodate(eb) &&
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btrfs_header_generation(eb) == parent_transid) {
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ret = 0;
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goto out;
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}
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btrfs_err_rl(eb->fs_info,
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"parent transid verify failed on %llu wanted %llu found %llu",
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eb->start,
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parent_transid, btrfs_header_generation(eb));
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ret = 1;
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clear_extent_buffer_uptodate(eb);
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out:
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unlock_extent_cached(io_tree, eb->start, eb->start + eb->len - 1,
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&cached_state);
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return ret;
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}
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static bool btrfs_supported_super_csum(u16 csum_type)
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{
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switch (csum_type) {
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case BTRFS_CSUM_TYPE_CRC32:
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case BTRFS_CSUM_TYPE_XXHASH:
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case BTRFS_CSUM_TYPE_SHA256:
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case BTRFS_CSUM_TYPE_BLAKE2:
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return true;
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default:
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return false;
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}
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}
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/*
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* Return 0 if the superblock checksum type matches the checksum value of that
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* algorithm. Pass the raw disk superblock data.
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*/
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static int btrfs_check_super_csum(struct btrfs_fs_info *fs_info,
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char *raw_disk_sb)
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{
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struct btrfs_super_block *disk_sb =
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(struct btrfs_super_block *)raw_disk_sb;
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char result[BTRFS_CSUM_SIZE];
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SHASH_DESC_ON_STACK(shash, fs_info->csum_shash);
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shash->tfm = fs_info->csum_shash;
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/*
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* The super_block structure does not span the whole
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* BTRFS_SUPER_INFO_SIZE range, we expect that the unused space is
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* filled with zeros and is included in the checksum.
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*/
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crypto_shash_digest(shash, raw_disk_sb + BTRFS_CSUM_SIZE,
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BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE, result);
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if (memcmp(disk_sb->csum, result, fs_info->csum_size))
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return 1;
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return 0;
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}
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int btrfs_verify_level_key(struct extent_buffer *eb, int level,
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struct btrfs_key *first_key, u64 parent_transid)
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{
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struct btrfs_fs_info *fs_info = eb->fs_info;
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int found_level;
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struct btrfs_key found_key;
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int ret;
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found_level = btrfs_header_level(eb);
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if (found_level != level) {
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WARN(IS_ENABLED(CONFIG_BTRFS_DEBUG),
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KERN_ERR "BTRFS: tree level check failed\n");
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btrfs_err(fs_info,
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"tree level mismatch detected, bytenr=%llu level expected=%u has=%u",
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eb->start, level, found_level);
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return -EIO;
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}
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if (!first_key)
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return 0;
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/*
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* For live tree block (new tree blocks in current transaction),
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* we need proper lock context to avoid race, which is impossible here.
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* So we only checks tree blocks which is read from disk, whose
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* generation <= fs_info->last_trans_committed.
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*/
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if (btrfs_header_generation(eb) > fs_info->last_trans_committed)
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return 0;
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/* We have @first_key, so this @eb must have at least one item */
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if (btrfs_header_nritems(eb) == 0) {
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btrfs_err(fs_info,
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"invalid tree nritems, bytenr=%llu nritems=0 expect >0",
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eb->start);
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WARN_ON(IS_ENABLED(CONFIG_BTRFS_DEBUG));
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return -EUCLEAN;
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}
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if (found_level)
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btrfs_node_key_to_cpu(eb, &found_key, 0);
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else
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btrfs_item_key_to_cpu(eb, &found_key, 0);
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ret = btrfs_comp_cpu_keys(first_key, &found_key);
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if (ret) {
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WARN(IS_ENABLED(CONFIG_BTRFS_DEBUG),
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KERN_ERR "BTRFS: tree first key check failed\n");
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btrfs_err(fs_info,
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"tree first key mismatch detected, bytenr=%llu parent_transid=%llu key expected=(%llu,%u,%llu) has=(%llu,%u,%llu)",
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eb->start, parent_transid, first_key->objectid,
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first_key->type, first_key->offset,
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found_key.objectid, found_key.type,
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found_key.offset);
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}
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return ret;
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}
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/*
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* helper to read a given tree block, doing retries as required when
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* the checksums don't match and we have alternate mirrors to try.
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*
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* @parent_transid: expected transid, skip check if 0
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* @level: expected level, mandatory check
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* @first_key: expected key of first slot, skip check if NULL
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*/
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static int btree_read_extent_buffer_pages(struct extent_buffer *eb,
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u64 parent_transid, int level,
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struct btrfs_key *first_key)
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{
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struct btrfs_fs_info *fs_info = eb->fs_info;
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struct extent_io_tree *io_tree;
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int failed = 0;
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int ret;
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int num_copies = 0;
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int mirror_num = 0;
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int failed_mirror = 0;
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io_tree = &BTRFS_I(fs_info->btree_inode)->io_tree;
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while (1) {
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clear_bit(EXTENT_BUFFER_CORRUPT, &eb->bflags);
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ret = read_extent_buffer_pages(eb, WAIT_COMPLETE, mirror_num);
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if (!ret) {
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if (verify_parent_transid(io_tree, eb,
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parent_transid, 0))
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ret = -EIO;
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else if (btrfs_verify_level_key(eb, level,
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first_key, parent_transid))
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ret = -EUCLEAN;
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else
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break;
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}
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num_copies = btrfs_num_copies(fs_info,
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eb->start, eb->len);
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if (num_copies == 1)
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break;
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if (!failed_mirror) {
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failed = 1;
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failed_mirror = eb->read_mirror;
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}
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mirror_num++;
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if (mirror_num == failed_mirror)
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mirror_num++;
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if (mirror_num > num_copies)
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break;
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}
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if (failed && !ret && failed_mirror)
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btrfs_repair_eb_io_failure(eb, failed_mirror);
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return ret;
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}
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static int csum_one_extent_buffer(struct extent_buffer *eb)
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{
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struct btrfs_fs_info *fs_info = eb->fs_info;
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u8 result[BTRFS_CSUM_SIZE];
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int ret;
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ASSERT(memcmp_extent_buffer(eb, fs_info->fs_devices->metadata_uuid,
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offsetof(struct btrfs_header, fsid),
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BTRFS_FSID_SIZE) == 0);
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csum_tree_block(eb, result);
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if (btrfs_header_level(eb))
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ret = btrfs_check_node(eb);
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else
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ret = btrfs_check_leaf_full(eb);
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if (ret < 0) {
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btrfs_print_tree(eb, 0);
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btrfs_err(fs_info,
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"block=%llu write time tree block corruption detected",
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eb->start);
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WARN_ON(IS_ENABLED(CONFIG_BTRFS_DEBUG));
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return ret;
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}
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write_extent_buffer(eb, result, 0, fs_info->csum_size);
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return 0;
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}
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/* Checksum all dirty extent buffers in one bio_vec */
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static int csum_dirty_subpage_buffers(struct btrfs_fs_info *fs_info,
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struct bio_vec *bvec)
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{
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struct page *page = bvec->bv_page;
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u64 bvec_start = page_offset(page) + bvec->bv_offset;
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u64 cur;
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int ret = 0;
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for (cur = bvec_start; cur < bvec_start + bvec->bv_len;
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cur += fs_info->nodesize) {
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struct extent_buffer *eb;
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bool uptodate;
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|
|
eb = find_extent_buffer(fs_info, cur);
|
|
uptodate = btrfs_subpage_test_uptodate(fs_info, page, cur,
|
|
fs_info->nodesize);
|
|
|
|
/* A dirty eb shouldn't disappear from buffer_radix */
|
|
if (WARN_ON(!eb))
|
|
return -EUCLEAN;
|
|
|
|
if (WARN_ON(cur != btrfs_header_bytenr(eb))) {
|
|
free_extent_buffer(eb);
|
|
return -EUCLEAN;
|
|
}
|
|
if (WARN_ON(!uptodate)) {
|
|
free_extent_buffer(eb);
|
|
return -EUCLEAN;
|
|
}
|
|
|
|
ret = csum_one_extent_buffer(eb);
|
|
free_extent_buffer(eb);
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* 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.
|
|
* For subpage extent buffers we need bvec to also read the offset in the page.
|
|
*/
|
|
static int csum_dirty_buffer(struct btrfs_fs_info *fs_info, struct bio_vec *bvec)
|
|
{
|
|
struct page *page = bvec->bv_page;
|
|
u64 start = page_offset(page);
|
|
u64 found_start;
|
|
struct extent_buffer *eb;
|
|
|
|
if (fs_info->sectorsize < PAGE_SIZE)
|
|
return csum_dirty_subpage_buffers(fs_info, bvec);
|
|
|
|
eb = (struct extent_buffer *)page->private;
|
|
if (page != eb->pages[0])
|
|
return 0;
|
|
|
|
found_start = btrfs_header_bytenr(eb);
|
|
|
|
if (test_bit(EXTENT_BUFFER_NO_CHECK, &eb->bflags)) {
|
|
WARN_ON(found_start != 0);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Please do not consolidate these warnings into a single if.
|
|
* It is useful to know what went wrong.
|
|
*/
|
|
if (WARN_ON(found_start != start))
|
|
return -EUCLEAN;
|
|
if (WARN_ON(!PageUptodate(page)))
|
|
return -EUCLEAN;
|
|
|
|
return csum_one_extent_buffer(eb);
|
|
}
|
|
|
|
static int check_tree_block_fsid(struct extent_buffer *eb)
|
|
{
|
|
struct btrfs_fs_info *fs_info = eb->fs_info;
|
|
struct btrfs_fs_devices *fs_devices = fs_info->fs_devices, *seed_devs;
|
|
u8 fsid[BTRFS_FSID_SIZE];
|
|
u8 *metadata_uuid;
|
|
|
|
read_extent_buffer(eb, fsid, offsetof(struct btrfs_header, fsid),
|
|
BTRFS_FSID_SIZE);
|
|
/*
|
|
* Checking the incompat flag is only valid for the current fs. For
|
|
* seed devices it's forbidden to have their uuid changed so reading
|
|
* ->fsid in this case is fine
|
|
*/
|
|
if (btrfs_fs_incompat(fs_info, METADATA_UUID))
|
|
metadata_uuid = fs_devices->metadata_uuid;
|
|
else
|
|
metadata_uuid = fs_devices->fsid;
|
|
|
|
if (!memcmp(fsid, metadata_uuid, BTRFS_FSID_SIZE))
|
|
return 0;
|
|
|
|
list_for_each_entry(seed_devs, &fs_devices->seed_list, seed_list)
|
|
if (!memcmp(fsid, seed_devs->fsid, BTRFS_FSID_SIZE))
|
|
return 0;
|
|
|
|
return 1;
|
|
}
|
|
|
|
/* Do basic extent buffer checks at read time */
|
|
static int validate_extent_buffer(struct extent_buffer *eb)
|
|
{
|
|
struct btrfs_fs_info *fs_info = eb->fs_info;
|
|
u64 found_start;
|
|
const u32 csum_size = fs_info->csum_size;
|
|
u8 found_level;
|
|
u8 result[BTRFS_CSUM_SIZE];
|
|
const u8 *header_csum;
|
|
int ret = 0;
|
|
|
|
found_start = btrfs_header_bytenr(eb);
|
|
if (found_start != eb->start) {
|
|
btrfs_err_rl(fs_info, "bad tree block start, want %llu have %llu",
|
|
eb->start, found_start);
|
|
ret = -EIO;
|
|
goto out;
|
|
}
|
|
if (check_tree_block_fsid(eb)) {
|
|
btrfs_err_rl(fs_info, "bad fsid on block %llu",
|
|
eb->start);
|
|
ret = -EIO;
|
|
goto out;
|
|
}
|
|
found_level = btrfs_header_level(eb);
|
|
if (found_level >= BTRFS_MAX_LEVEL) {
|
|
btrfs_err(fs_info, "bad tree block level %d on %llu",
|
|
(int)btrfs_header_level(eb), eb->start);
|
|
ret = -EIO;
|
|
goto out;
|
|
}
|
|
|
|
csum_tree_block(eb, result);
|
|
header_csum = page_address(eb->pages[0]) +
|
|
get_eb_offset_in_page(eb, offsetof(struct btrfs_header, csum));
|
|
|
|
if (memcmp(result, header_csum, csum_size) != 0) {
|
|
btrfs_warn_rl(fs_info,
|
|
"checksum verify failed on %llu wanted " CSUM_FMT " found " CSUM_FMT " level %d",
|
|
eb->start,
|
|
CSUM_FMT_VALUE(csum_size, header_csum),
|
|
CSUM_FMT_VALUE(csum_size, result),
|
|
btrfs_header_level(eb));
|
|
ret = -EUCLEAN;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* 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 && btrfs_check_leaf_full(eb)) {
|
|
set_bit(EXTENT_BUFFER_CORRUPT, &eb->bflags);
|
|
ret = -EIO;
|
|
}
|
|
|
|
if (found_level > 0 && btrfs_check_node(eb))
|
|
ret = -EIO;
|
|
|
|
if (!ret)
|
|
set_extent_buffer_uptodate(eb);
|
|
else
|
|
btrfs_err(fs_info,
|
|
"block=%llu read time tree block corruption detected",
|
|
eb->start);
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static int validate_subpage_buffer(struct page *page, u64 start, u64 end,
|
|
int mirror)
|
|
{
|
|
struct btrfs_fs_info *fs_info = btrfs_sb(page->mapping->host->i_sb);
|
|
struct extent_buffer *eb;
|
|
bool reads_done;
|
|
int ret = 0;
|
|
|
|
/*
|
|
* We don't allow bio merge for subpage metadata read, so we should
|
|
* only get one eb for each endio hook.
|
|
*/
|
|
ASSERT(end == start + fs_info->nodesize - 1);
|
|
ASSERT(PagePrivate(page));
|
|
|
|
eb = find_extent_buffer(fs_info, start);
|
|
/*
|
|
* When we are reading one tree block, eb must have been inserted into
|
|
* the radix tree. If not, something is wrong.
|
|
*/
|
|
ASSERT(eb);
|
|
|
|
reads_done = atomic_dec_and_test(&eb->io_pages);
|
|
/* Subpage read must finish in page read */
|
|
ASSERT(reads_done);
|
|
|
|
eb->read_mirror = mirror;
|
|
if (test_bit(EXTENT_BUFFER_READ_ERR, &eb->bflags)) {
|
|
ret = -EIO;
|
|
goto err;
|
|
}
|
|
ret = validate_extent_buffer(eb);
|
|
if (ret < 0)
|
|
goto err;
|
|
|
|
set_extent_buffer_uptodate(eb);
|
|
|
|
free_extent_buffer(eb);
|
|
return ret;
|
|
err:
|
|
/*
|
|
* end_bio_extent_readpage decrements io_pages in case of error,
|
|
* make sure it has something to decrement.
|
|
*/
|
|
atomic_inc(&eb->io_pages);
|
|
clear_extent_buffer_uptodate(eb);
|
|
free_extent_buffer(eb);
|
|
return ret;
|
|
}
|
|
|
|
int btrfs_validate_metadata_buffer(struct btrfs_bio *bbio,
|
|
struct page *page, u64 start, u64 end,
|
|
int mirror)
|
|
{
|
|
struct extent_buffer *eb;
|
|
int ret = 0;
|
|
int reads_done;
|
|
|
|
ASSERT(page->private);
|
|
|
|
if (btrfs_sb(page->mapping->host->i_sb)->sectorsize < PAGE_SIZE)
|
|
return validate_subpage_buffer(page, start, end, mirror);
|
|
|
|
eb = (struct extent_buffer *)page->private;
|
|
|
|
/*
|
|
* 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
|
|
*/
|
|
atomic_inc(&eb->refs);
|
|
|
|
reads_done = atomic_dec_and_test(&eb->io_pages);
|
|
if (!reads_done)
|
|
goto err;
|
|
|
|
eb->read_mirror = mirror;
|
|
if (test_bit(EXTENT_BUFFER_READ_ERR, &eb->bflags)) {
|
|
ret = -EIO;
|
|
goto err;
|
|
}
|
|
ret = validate_extent_buffer(eb);
|
|
err:
|
|
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);
|
|
clear_extent_buffer_uptodate(eb);
|
|
}
|
|
free_extent_buffer(eb);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void end_workqueue_bio(struct bio *bio)
|
|
{
|
|
struct btrfs_end_io_wq *end_io_wq = bio->bi_private;
|
|
struct btrfs_fs_info *fs_info;
|
|
struct btrfs_workqueue *wq;
|
|
|
|
fs_info = end_io_wq->info;
|
|
end_io_wq->status = bio->bi_status;
|
|
|
|
if (btrfs_op(bio) == BTRFS_MAP_WRITE) {
|
|
if (end_io_wq->metadata == BTRFS_WQ_ENDIO_METADATA)
|
|
wq = fs_info->endio_meta_write_workers;
|
|
else if (end_io_wq->metadata == BTRFS_WQ_ENDIO_FREE_SPACE)
|
|
wq = fs_info->endio_freespace_worker;
|
|
else if (end_io_wq->metadata == BTRFS_WQ_ENDIO_RAID56)
|
|
wq = fs_info->endio_raid56_workers;
|
|
else
|
|
wq = fs_info->endio_write_workers;
|
|
} else {
|
|
if (end_io_wq->metadata == BTRFS_WQ_ENDIO_RAID56)
|
|
wq = fs_info->endio_raid56_workers;
|
|
else if (end_io_wq->metadata)
|
|
wq = fs_info->endio_meta_workers;
|
|
else
|
|
wq = fs_info->endio_workers;
|
|
}
|
|
|
|
btrfs_init_work(&end_io_wq->work, end_workqueue_fn, NULL, NULL);
|
|
btrfs_queue_work(wq, &end_io_wq->work);
|
|
}
|
|
|
|
blk_status_t btrfs_bio_wq_end_io(struct btrfs_fs_info *info, struct bio *bio,
|
|
enum btrfs_wq_endio_type metadata)
|
|
{
|
|
struct btrfs_end_io_wq *end_io_wq;
|
|
|
|
end_io_wq = kmem_cache_alloc(btrfs_end_io_wq_cache, GFP_NOFS);
|
|
if (!end_io_wq)
|
|
return BLK_STS_RESOURCE;
|
|
|
|
end_io_wq->private = bio->bi_private;
|
|
end_io_wq->end_io = bio->bi_end_io;
|
|
end_io_wq->info = info;
|
|
end_io_wq->status = 0;
|
|
end_io_wq->bio = bio;
|
|
end_io_wq->metadata = metadata;
|
|
|
|
bio->bi_private = end_io_wq;
|
|
bio->bi_end_io = end_workqueue_bio;
|
|
return 0;
|
|
}
|
|
|
|
static void run_one_async_start(struct btrfs_work *work)
|
|
{
|
|
struct async_submit_bio *async;
|
|
blk_status_t ret;
|
|
|
|
async = container_of(work, struct async_submit_bio, work);
|
|
ret = async->submit_bio_start(async->inode, async->bio,
|
|
async->dio_file_offset);
|
|
if (ret)
|
|
async->status = ret;
|
|
}
|
|
|
|
/*
|
|
* In order to insert checksums into the metadata in large chunks, we wait
|
|
* until bio submission time. All the pages in the bio are checksummed and
|
|
* sums are attached onto the ordered extent record.
|
|
*
|
|
* At IO completion time the csums attached on the ordered extent record are
|
|
* inserted into the tree.
|
|
*/
|
|
static void run_one_async_done(struct btrfs_work *work)
|
|
{
|
|
struct async_submit_bio *async;
|
|
struct inode *inode;
|
|
blk_status_t ret;
|
|
|
|
async = container_of(work, struct async_submit_bio, work);
|
|
inode = async->inode;
|
|
|
|
/* If an error occurred we just want to clean up the bio and move on */
|
|
if (async->status) {
|
|
async->bio->bi_status = async->status;
|
|
bio_endio(async->bio);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* All of the bios that pass through here are from async helpers.
|
|
* Use REQ_CGROUP_PUNT to issue them from the owning cgroup's context.
|
|
* This changes nothing when cgroups aren't in use.
|
|
*/
|
|
async->bio->bi_opf |= REQ_CGROUP_PUNT;
|
|
ret = btrfs_map_bio(btrfs_sb(inode->i_sb), async->bio, async->mirror_num);
|
|
if (ret) {
|
|
async->bio->bi_status = ret;
|
|
bio_endio(async->bio);
|
|
}
|
|
}
|
|
|
|
static void run_one_async_free(struct btrfs_work *work)
|
|
{
|
|
struct async_submit_bio *async;
|
|
|
|
async = container_of(work, struct async_submit_bio, work);
|
|
kfree(async);
|
|
}
|
|
|
|
blk_status_t btrfs_wq_submit_bio(struct inode *inode, struct bio *bio,
|
|
int mirror_num, unsigned long bio_flags,
|
|
u64 dio_file_offset,
|
|
extent_submit_bio_start_t *submit_bio_start)
|
|
{
|
|
struct btrfs_fs_info *fs_info = BTRFS_I(inode)->root->fs_info;
|
|
struct async_submit_bio *async;
|
|
|
|
async = kmalloc(sizeof(*async), GFP_NOFS);
|
|
if (!async)
|
|
return BLK_STS_RESOURCE;
|
|
|
|
async->inode = inode;
|
|
async->bio = bio;
|
|
async->mirror_num = mirror_num;
|
|
async->submit_bio_start = submit_bio_start;
|
|
|
|
btrfs_init_work(&async->work, run_one_async_start, run_one_async_done,
|
|
run_one_async_free);
|
|
|
|
async->dio_file_offset = dio_file_offset;
|
|
|
|
async->status = 0;
|
|
|
|
if (op_is_sync(bio->bi_opf))
|
|
btrfs_set_work_high_priority(&async->work);
|
|
|
|
btrfs_queue_work(fs_info->workers, &async->work);
|
|
return 0;
|
|
}
|
|
|
|
static blk_status_t btree_csum_one_bio(struct bio *bio)
|
|
{
|
|
struct bio_vec *bvec;
|
|
struct btrfs_root *root;
|
|
int ret = 0;
|
|
struct bvec_iter_all iter_all;
|
|
|
|
ASSERT(!bio_flagged(bio, BIO_CLONED));
|
|
bio_for_each_segment_all(bvec, bio, iter_all) {
|
|
root = BTRFS_I(bvec->bv_page->mapping->host)->root;
|
|
ret = csum_dirty_buffer(root->fs_info, bvec);
|
|
if (ret)
|
|
break;
|
|
}
|
|
|
|
return errno_to_blk_status(ret);
|
|
}
|
|
|
|
static blk_status_t btree_submit_bio_start(struct inode *inode, struct bio *bio,
|
|
u64 dio_file_offset)
|
|
{
|
|
/*
|
|
* when we're called for a write, we're already in the async
|
|
* submission context. Just jump into btrfs_map_bio
|
|
*/
|
|
return btree_csum_one_bio(bio);
|
|
}
|
|
|
|
static bool should_async_write(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_inode *bi)
|
|
{
|
|
if (btrfs_is_zoned(fs_info))
|
|
return false;
|
|
if (atomic_read(&bi->sync_writers))
|
|
return false;
|
|
if (test_bit(BTRFS_FS_CSUM_IMPL_FAST, &fs_info->flags))
|
|
return false;
|
|
return true;
|
|
}
|
|
|
|
blk_status_t btrfs_submit_metadata_bio(struct inode *inode, struct bio *bio,
|
|
int mirror_num, unsigned long bio_flags)
|
|
{
|
|
struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
|
|
blk_status_t ret;
|
|
|
|
if (btrfs_op(bio) != BTRFS_MAP_WRITE) {
|
|
/*
|
|
* called for a read, do the setup so that checksum validation
|
|
* can happen in the async kernel threads
|
|
*/
|
|
ret = btrfs_bio_wq_end_io(fs_info, bio,
|
|
BTRFS_WQ_ENDIO_METADATA);
|
|
if (ret)
|
|
goto out_w_error;
|
|
ret = btrfs_map_bio(fs_info, bio, mirror_num);
|
|
} else if (!should_async_write(fs_info, BTRFS_I(inode))) {
|
|
ret = btree_csum_one_bio(bio);
|
|
if (ret)
|
|
goto out_w_error;
|
|
ret = btrfs_map_bio(fs_info, bio, mirror_num);
|
|
} else {
|
|
/*
|
|
* kthread helpers are used to submit writes so that
|
|
* checksumming can happen in parallel across all CPUs
|
|
*/
|
|
ret = btrfs_wq_submit_bio(inode, bio, mirror_num, 0,
|
|
0, btree_submit_bio_start);
|
|
}
|
|
|
|
if (ret)
|
|
goto out_w_error;
|
|
return 0;
|
|
|
|
out_w_error:
|
|
bio->bi_status = ret;
|
|
bio_endio(bio);
|
|
return ret;
|
|
}
|
|
|
|
#ifdef CONFIG_MIGRATION
|
|
static int btree_migratepage(struct address_space *mapping,
|
|
struct page *newpage, struct page *page,
|
|
enum migrate_mode mode)
|
|
{
|
|
/*
|
|
* 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;
|
|
return migrate_page(mapping, newpage, page, mode);
|
|
}
|
|
#endif
|
|
|
|
|
|
static int btree_writepages(struct address_space *mapping,
|
|
struct writeback_control *wbc)
|
|
{
|
|
struct btrfs_fs_info *fs_info;
|
|
int ret;
|
|
|
|
if (wbc->sync_mode == WB_SYNC_NONE) {
|
|
|
|
if (wbc->for_kupdate)
|
|
return 0;
|
|
|
|
fs_info = BTRFS_I(mapping->host)->root->fs_info;
|
|
/* this is a bit racy, but that's ok */
|
|
ret = __percpu_counter_compare(&fs_info->dirty_metadata_bytes,
|
|
BTRFS_DIRTY_METADATA_THRESH,
|
|
fs_info->dirty_metadata_batch);
|
|
if (ret < 0)
|
|
return 0;
|
|
}
|
|
return btree_write_cache_pages(mapping, wbc);
|
|
}
|
|
|
|
static int btree_releasepage(struct page *page, gfp_t gfp_flags)
|
|
{
|
|
if (PageWriteback(page) || PageDirty(page))
|
|
return 0;
|
|
|
|
return try_release_extent_buffer(page);
|
|
}
|
|
|
|
static void btree_invalidatepage(struct page *page, unsigned int offset,
|
|
unsigned int length)
|
|
{
|
|
struct extent_io_tree *tree;
|
|
tree = &BTRFS_I(page->mapping->host)->io_tree;
|
|
extent_invalidatepage(tree, page, offset);
|
|
btree_releasepage(page, GFP_NOFS);
|
|
if (PagePrivate(page)) {
|
|
btrfs_warn(BTRFS_I(page->mapping->host)->root->fs_info,
|
|
"page private not zero on page %llu",
|
|
(unsigned long long)page_offset(page));
|
|
detach_page_private(page);
|
|
}
|
|
}
|
|
|
|
static int btree_set_page_dirty(struct page *page)
|
|
{
|
|
#ifdef DEBUG
|
|
struct btrfs_fs_info *fs_info = btrfs_sb(page->mapping->host->i_sb);
|
|
struct btrfs_subpage *subpage;
|
|
struct extent_buffer *eb;
|
|
int cur_bit = 0;
|
|
u64 page_start = page_offset(page);
|
|
|
|
if (fs_info->sectorsize == PAGE_SIZE) {
|
|
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_write_locked(eb);
|
|
return __set_page_dirty_nobuffers(page);
|
|
}
|
|
ASSERT(PagePrivate(page) && page->private);
|
|
subpage = (struct btrfs_subpage *)page->private;
|
|
|
|
ASSERT(subpage->dirty_bitmap);
|
|
while (cur_bit < BTRFS_SUBPAGE_BITMAP_SIZE) {
|
|
unsigned long flags;
|
|
u64 cur;
|
|
u16 tmp = (1 << cur_bit);
|
|
|
|
spin_lock_irqsave(&subpage->lock, flags);
|
|
if (!(tmp & subpage->dirty_bitmap)) {
|
|
spin_unlock_irqrestore(&subpage->lock, flags);
|
|
cur_bit++;
|
|
continue;
|
|
}
|
|
spin_unlock_irqrestore(&subpage->lock, flags);
|
|
cur = page_start + cur_bit * fs_info->sectorsize;
|
|
|
|
eb = find_extent_buffer(fs_info, cur);
|
|
ASSERT(eb);
|
|
ASSERT(test_bit(EXTENT_BUFFER_DIRTY, &eb->bflags));
|
|
ASSERT(atomic_read(&eb->refs));
|
|
btrfs_assert_tree_write_locked(eb);
|
|
free_extent_buffer(eb);
|
|
|
|
cur_bit += (fs_info->nodesize >> fs_info->sectorsize_bits);
|
|
}
|
|
#endif
|
|
return __set_page_dirty_nobuffers(page);
|
|
}
|
|
|
|
static const struct address_space_operations btree_aops = {
|
|
.writepages = btree_writepages,
|
|
.releasepage = btree_releasepage,
|
|
.invalidatepage = btree_invalidatepage,
|
|
#ifdef CONFIG_MIGRATION
|
|
.migratepage = btree_migratepage,
|
|
#endif
|
|
.set_page_dirty = btree_set_page_dirty,
|
|
};
|
|
|
|
struct extent_buffer *btrfs_find_create_tree_block(
|
|
struct btrfs_fs_info *fs_info,
|
|
u64 bytenr, u64 owner_root,
|
|
int level)
|
|
{
|
|
if (btrfs_is_testing(fs_info))
|
|
return alloc_test_extent_buffer(fs_info, bytenr);
|
|
return alloc_extent_buffer(fs_info, bytenr, owner_root, level);
|
|
}
|
|
|
|
/*
|
|
* Read tree block at logical address @bytenr and do variant basic but critical
|
|
* verification.
|
|
*
|
|
* @owner_root: the objectid of the root owner for this block.
|
|
* @parent_transid: expected transid of this tree block, skip check if 0
|
|
* @level: expected level, mandatory check
|
|
* @first_key: expected key in slot 0, skip check if NULL
|
|
*/
|
|
struct extent_buffer *read_tree_block(struct btrfs_fs_info *fs_info, u64 bytenr,
|
|
u64 owner_root, u64 parent_transid,
|
|
int level, struct btrfs_key *first_key)
|
|
{
|
|
struct extent_buffer *buf = NULL;
|
|
int ret;
|
|
|
|
buf = btrfs_find_create_tree_block(fs_info, bytenr, owner_root, level);
|
|
if (IS_ERR(buf))
|
|
return buf;
|
|
|
|
ret = btree_read_extent_buffer_pages(buf, parent_transid,
|
|
level, first_key);
|
|
if (ret) {
|
|
free_extent_buffer_stale(buf);
|
|
return ERR_PTR(ret);
|
|
}
|
|
return buf;
|
|
|
|
}
|
|
|
|
void btrfs_clean_tree_block(struct extent_buffer *buf)
|
|
{
|
|
struct btrfs_fs_info *fs_info = buf->fs_info;
|
|
if (btrfs_header_generation(buf) ==
|
|
fs_info->running_transaction->transid) {
|
|
btrfs_assert_tree_write_locked(buf);
|
|
|
|
if (test_and_clear_bit(EXTENT_BUFFER_DIRTY, &buf->bflags)) {
|
|
percpu_counter_add_batch(&fs_info->dirty_metadata_bytes,
|
|
-buf->len,
|
|
fs_info->dirty_metadata_batch);
|
|
clear_extent_buffer_dirty(buf);
|
|
}
|
|
}
|
|
}
|
|
|
|
static void __setup_root(struct btrfs_root *root, struct btrfs_fs_info *fs_info,
|
|
u64 objectid)
|
|
{
|
|
bool dummy = test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state);
|
|
|
|
memset(&root->root_key, 0, sizeof(root->root_key));
|
|
memset(&root->root_item, 0, sizeof(root->root_item));
|
|
memset(&root->defrag_progress, 0, sizeof(root->defrag_progress));
|
|
root->fs_info = fs_info;
|
|
root->root_key.objectid = objectid;
|
|
root->node = NULL;
|
|
root->commit_root = NULL;
|
|
root->state = 0;
|
|
RB_CLEAR_NODE(&root->rb_node);
|
|
|
|
root->last_trans = 0;
|
|
root->free_objectid = 0;
|
|
root->nr_delalloc_inodes = 0;
|
|
root->nr_ordered_extents = 0;
|
|
root->inode_tree = RB_ROOT;
|
|
INIT_RADIX_TREE(&root->delayed_nodes_tree, GFP_ATOMIC);
|
|
|
|
btrfs_init_root_block_rsv(root);
|
|
|
|
INIT_LIST_HEAD(&root->dirty_list);
|
|
INIT_LIST_HEAD(&root->root_list);
|
|
INIT_LIST_HEAD(&root->delalloc_inodes);
|
|
INIT_LIST_HEAD(&root->delalloc_root);
|
|
INIT_LIST_HEAD(&root->ordered_extents);
|
|
INIT_LIST_HEAD(&root->ordered_root);
|
|
INIT_LIST_HEAD(&root->reloc_dirty_list);
|
|
INIT_LIST_HEAD(&root->logged_list[0]);
|
|
INIT_LIST_HEAD(&root->logged_list[1]);
|
|
spin_lock_init(&root->inode_lock);
|
|
spin_lock_init(&root->delalloc_lock);
|
|
spin_lock_init(&root->ordered_extent_lock);
|
|
spin_lock_init(&root->accounting_lock);
|
|
spin_lock_init(&root->log_extents_lock[0]);
|
|
spin_lock_init(&root->log_extents_lock[1]);
|
|
spin_lock_init(&root->qgroup_meta_rsv_lock);
|
|
mutex_init(&root->objectid_mutex);
|
|
mutex_init(&root->log_mutex);
|
|
mutex_init(&root->ordered_extent_mutex);
|
|
mutex_init(&root->delalloc_mutex);
|
|
init_waitqueue_head(&root->qgroup_flush_wait);
|
|
init_waitqueue_head(&root->log_writer_wait);
|
|
init_waitqueue_head(&root->log_commit_wait[0]);
|
|
init_waitqueue_head(&root->log_commit_wait[1]);
|
|
INIT_LIST_HEAD(&root->log_ctxs[0]);
|
|
INIT_LIST_HEAD(&root->log_ctxs[1]);
|
|
atomic_set(&root->log_commit[0], 0);
|
|
atomic_set(&root->log_commit[1], 0);
|
|
atomic_set(&root->log_writers, 0);
|
|
atomic_set(&root->log_batch, 0);
|
|
refcount_set(&root->refs, 1);
|
|
atomic_set(&root->snapshot_force_cow, 0);
|
|
atomic_set(&root->nr_swapfiles, 0);
|
|
root->log_transid = 0;
|
|
root->log_transid_committed = -1;
|
|
root->last_log_commit = 0;
|
|
root->anon_dev = 0;
|
|
if (!dummy) {
|
|
extent_io_tree_init(fs_info, &root->dirty_log_pages,
|
|
IO_TREE_ROOT_DIRTY_LOG_PAGES, NULL);
|
|
extent_io_tree_init(fs_info, &root->log_csum_range,
|
|
IO_TREE_LOG_CSUM_RANGE, NULL);
|
|
}
|
|
|
|
spin_lock_init(&root->root_item_lock);
|
|
btrfs_qgroup_init_swapped_blocks(&root->swapped_blocks);
|
|
#ifdef CONFIG_BTRFS_DEBUG
|
|
INIT_LIST_HEAD(&root->leak_list);
|
|
spin_lock(&fs_info->fs_roots_radix_lock);
|
|
list_add_tail(&root->leak_list, &fs_info->allocated_roots);
|
|
spin_unlock(&fs_info->fs_roots_radix_lock);
|
|
#endif
|
|
}
|
|
|
|
static struct btrfs_root *btrfs_alloc_root(struct btrfs_fs_info *fs_info,
|
|
u64 objectid, gfp_t flags)
|
|
{
|
|
struct btrfs_root *root = kzalloc(sizeof(*root), flags);
|
|
if (root)
|
|
__setup_root(root, fs_info, objectid);
|
|
return root;
|
|
}
|
|
|
|
#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
|
|
/* Should only be used by the testing infrastructure */
|
|
struct btrfs_root *btrfs_alloc_dummy_root(struct btrfs_fs_info *fs_info)
|
|
{
|
|
struct btrfs_root *root;
|
|
|
|
if (!fs_info)
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
root = btrfs_alloc_root(fs_info, BTRFS_ROOT_TREE_OBJECTID, GFP_KERNEL);
|
|
if (!root)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
/* We don't use the stripesize in selftest, set it as sectorsize */
|
|
root->alloc_bytenr = 0;
|
|
|
|
return root;
|
|
}
|
|
#endif
|
|
|
|
static int global_root_cmp(struct rb_node *a_node, const struct rb_node *b_node)
|
|
{
|
|
const struct btrfs_root *a = rb_entry(a_node, struct btrfs_root, rb_node);
|
|
const struct btrfs_root *b = rb_entry(b_node, struct btrfs_root, rb_node);
|
|
|
|
return btrfs_comp_cpu_keys(&a->root_key, &b->root_key);
|
|
}
|
|
|
|
static int global_root_key_cmp(const void *k, const struct rb_node *node)
|
|
{
|
|
const struct btrfs_key *key = k;
|
|
const struct btrfs_root *root = rb_entry(node, struct btrfs_root, rb_node);
|
|
|
|
return btrfs_comp_cpu_keys(key, &root->root_key);
|
|
}
|
|
|
|
int btrfs_global_root_insert(struct btrfs_root *root)
|
|
{
|
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
|
struct rb_node *tmp;
|
|
|
|
write_lock(&fs_info->global_root_lock);
|
|
tmp = rb_find_add(&root->rb_node, &fs_info->global_root_tree, global_root_cmp);
|
|
write_unlock(&fs_info->global_root_lock);
|
|
ASSERT(!tmp);
|
|
|
|
return tmp ? -EEXIST : 0;
|
|
}
|
|
|
|
void btrfs_global_root_delete(struct btrfs_root *root)
|
|
{
|
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
|
|
|
write_lock(&fs_info->global_root_lock);
|
|
rb_erase(&root->rb_node, &fs_info->global_root_tree);
|
|
write_unlock(&fs_info->global_root_lock);
|
|
}
|
|
|
|
struct btrfs_root *btrfs_global_root(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_key *key)
|
|
{
|
|
struct rb_node *node;
|
|
struct btrfs_root *root = NULL;
|
|
|
|
read_lock(&fs_info->global_root_lock);
|
|
node = rb_find(key, &fs_info->global_root_tree, global_root_key_cmp);
|
|
if (node)
|
|
root = container_of(node, struct btrfs_root, rb_node);
|
|
read_unlock(&fs_info->global_root_lock);
|
|
|
|
return root;
|
|
}
|
|
|
|
struct btrfs_root *btrfs_csum_root(struct btrfs_fs_info *fs_info, u64 bytenr)
|
|
{
|
|
struct btrfs_key key = {
|
|
.objectid = BTRFS_CSUM_TREE_OBJECTID,
|
|
.type = BTRFS_ROOT_ITEM_KEY,
|
|
.offset = 0,
|
|
};
|
|
|
|
return btrfs_global_root(fs_info, &key);
|
|
}
|
|
|
|
struct btrfs_root *btrfs_extent_root(struct btrfs_fs_info *fs_info, u64 bytenr)
|
|
{
|
|
struct btrfs_key key = {
|
|
.objectid = BTRFS_EXTENT_TREE_OBJECTID,
|
|
.type = BTRFS_ROOT_ITEM_KEY,
|
|
.offset = 0,
|
|
};
|
|
|
|
return btrfs_global_root(fs_info, &key);
|
|
}
|
|
|
|
struct btrfs_root *btrfs_create_tree(struct btrfs_trans_handle *trans,
|
|
u64 objectid)
|
|
{
|
|
struct btrfs_fs_info *fs_info = trans->fs_info;
|
|
struct extent_buffer *leaf;
|
|
struct btrfs_root *tree_root = fs_info->tree_root;
|
|
struct btrfs_root *root;
|
|
struct btrfs_key key;
|
|
unsigned int nofs_flag;
|
|
int ret = 0;
|
|
|
|
/*
|
|
* We're holding a transaction handle, so use a NOFS memory allocation
|
|
* context to avoid deadlock if reclaim happens.
|
|
*/
|
|
nofs_flag = memalloc_nofs_save();
|
|
root = btrfs_alloc_root(fs_info, objectid, GFP_KERNEL);
|
|
memalloc_nofs_restore(nofs_flag);
|
|
if (!root)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
root->root_key.objectid = objectid;
|
|
root->root_key.type = BTRFS_ROOT_ITEM_KEY;
|
|
root->root_key.offset = 0;
|
|
|
|
leaf = btrfs_alloc_tree_block(trans, root, 0, objectid, NULL, 0, 0, 0,
|
|
BTRFS_NESTING_NORMAL);
|
|
if (IS_ERR(leaf)) {
|
|
ret = PTR_ERR(leaf);
|
|
leaf = NULL;
|
|
goto fail_unlock;
|
|
}
|
|
|
|
root->node = leaf;
|
|
btrfs_mark_buffer_dirty(leaf);
|
|
|
|
root->commit_root = btrfs_root_node(root);
|
|
set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
|
|
|
|
btrfs_set_root_flags(&root->root_item, 0);
|
|
btrfs_set_root_limit(&root->root_item, 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);
|
|
if (is_fstree(objectid))
|
|
generate_random_guid(root->root_item.uuid);
|
|
else
|
|
export_guid(root->root_item.uuid, &guid_null);
|
|
btrfs_set_root_drop_level(&root->root_item, 0);
|
|
|
|
btrfs_tree_unlock(leaf);
|
|
|
|
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;
|
|
|
|
return root;
|
|
|
|
fail_unlock:
|
|
if (leaf)
|
|
btrfs_tree_unlock(leaf);
|
|
fail:
|
|
btrfs_put_root(root);
|
|
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
static struct btrfs_root *alloc_log_tree(struct btrfs_trans_handle *trans,
|
|
struct btrfs_fs_info *fs_info)
|
|
{
|
|
struct btrfs_root *root;
|
|
|
|
root = btrfs_alloc_root(fs_info, BTRFS_TREE_LOG_OBJECTID, GFP_NOFS);
|
|
if (!root)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
root->root_key.objectid = BTRFS_TREE_LOG_OBJECTID;
|
|
root->root_key.type = BTRFS_ROOT_ITEM_KEY;
|
|
root->root_key.offset = BTRFS_TREE_LOG_OBJECTID;
|
|
|
|
return root;
|
|
}
|
|
|
|
int btrfs_alloc_log_tree_node(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root)
|
|
{
|
|
struct extent_buffer *leaf;
|
|
|
|
/*
|
|
* DON'T set SHAREABLE bit for log trees.
|
|
*
|
|
* Log trees are not exposed to user space thus can't be snapshotted,
|
|
* and 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).
|
|
*/
|
|
|
|
leaf = btrfs_alloc_tree_block(trans, root, 0, BTRFS_TREE_LOG_OBJECTID,
|
|
NULL, 0, 0, 0, BTRFS_NESTING_NORMAL);
|
|
if (IS_ERR(leaf))
|
|
return PTR_ERR(leaf);
|
|
|
|
root->node = leaf;
|
|
|
|
btrfs_mark_buffer_dirty(root->node);
|
|
btrfs_tree_unlock(root->node);
|
|
|
|
return 0;
|
|
}
|
|
|
|
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);
|
|
|
|
if (!btrfs_is_zoned(fs_info)) {
|
|
int ret = btrfs_alloc_log_tree_node(trans, log_root);
|
|
|
|
if (ret) {
|
|
btrfs_put_root(log_root);
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
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_fs_info *fs_info = root->fs_info;
|
|
struct btrfs_root *log_root;
|
|
struct btrfs_inode_item *inode_item;
|
|
int ret;
|
|
|
|
log_root = alloc_log_tree(trans, fs_info);
|
|
if (IS_ERR(log_root))
|
|
return PTR_ERR(log_root);
|
|
|
|
ret = btrfs_alloc_log_tree_node(trans, log_root);
|
|
if (ret) {
|
|
btrfs_put_root(log_root);
|
|
return ret;
|
|
}
|
|
|
|
log_root->last_trans = trans->transid;
|
|
log_root->root_key.offset = root->root_key.objectid;
|
|
|
|
inode_item = &log_root->root_item.inode;
|
|
btrfs_set_stack_inode_generation(inode_item, 1);
|
|
btrfs_set_stack_inode_size(inode_item, 3);
|
|
btrfs_set_stack_inode_nlink(inode_item, 1);
|
|
btrfs_set_stack_inode_nbytes(inode_item,
|
|
fs_info->nodesize);
|
|
btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755);
|
|
|
|
btrfs_set_root_node(&log_root->root_item, log_root->node);
|
|
|
|
WARN_ON(root->log_root);
|
|
root->log_root = log_root;
|
|
root->log_transid = 0;
|
|
root->log_transid_committed = -1;
|
|
root->last_log_commit = 0;
|
|
return 0;
|
|
}
|
|
|
|
static struct btrfs_root *read_tree_root_path(struct btrfs_root *tree_root,
|
|
struct btrfs_path *path,
|
|
struct btrfs_key *key)
|
|
{
|
|
struct btrfs_root *root;
|
|
struct btrfs_fs_info *fs_info = tree_root->fs_info;
|
|
u64 generation;
|
|
int ret;
|
|
int level;
|
|
|
|
root = btrfs_alloc_root(fs_info, key->objectid, GFP_NOFS);
|
|
if (!root)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
ret = btrfs_find_root(tree_root, key, path,
|
|
&root->root_item, &root->root_key);
|
|
if (ret) {
|
|
if (ret > 0)
|
|
ret = -ENOENT;
|
|
goto fail;
|
|
}
|
|
|
|
generation = btrfs_root_generation(&root->root_item);
|
|
level = btrfs_root_level(&root->root_item);
|
|
root->node = read_tree_block(fs_info,
|
|
btrfs_root_bytenr(&root->root_item),
|
|
key->objectid, generation, level, NULL);
|
|
if (IS_ERR(root->node)) {
|
|
ret = PTR_ERR(root->node);
|
|
root->node = NULL;
|
|
goto fail;
|
|
} else if (!btrfs_buffer_uptodate(root->node, generation, 0)) {
|
|
ret = -EIO;
|
|
goto fail;
|
|
}
|
|
root->commit_root = btrfs_root_node(root);
|
|
return root;
|
|
fail:
|
|
btrfs_put_root(root);
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
struct btrfs_root *btrfs_read_tree_root(struct btrfs_root *tree_root,
|
|
struct btrfs_key *key)
|
|
{
|
|
struct btrfs_root *root;
|
|
struct btrfs_path *path;
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
return ERR_PTR(-ENOMEM);
|
|
root = read_tree_root_path(tree_root, path, key);
|
|
btrfs_free_path(path);
|
|
|
|
return root;
|
|
}
|
|
|
|
/*
|
|
* Initialize subvolume root in-memory structure
|
|
*
|
|
* @anon_dev: anonymous device to attach to the root, if zero, allocate new
|
|
*/
|
|
static int btrfs_init_fs_root(struct btrfs_root *root, dev_t anon_dev)
|
|
{
|
|
int ret;
|
|
unsigned int nofs_flag;
|
|
|
|
/*
|
|
* We might be called under a transaction (e.g. indirect backref
|
|
* resolution) which could deadlock if it triggers memory reclaim
|
|
*/
|
|
nofs_flag = memalloc_nofs_save();
|
|
ret = btrfs_drew_lock_init(&root->snapshot_lock);
|
|
memalloc_nofs_restore(nofs_flag);
|
|
if (ret)
|
|
goto fail;
|
|
|
|
if (root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID &&
|
|
!btrfs_is_data_reloc_root(root)) {
|
|
set_bit(BTRFS_ROOT_SHAREABLE, &root->state);
|
|
btrfs_check_and_init_root_item(&root->root_item);
|
|
}
|
|
|
|
/*
|
|
* Don't assign anonymous block device to roots that are not exposed to
|
|
* userspace, the id pool is limited to 1M
|
|
*/
|
|
if (is_fstree(root->root_key.objectid) &&
|
|
btrfs_root_refs(&root->root_item) > 0) {
|
|
if (!anon_dev) {
|
|
ret = get_anon_bdev(&root->anon_dev);
|
|
if (ret)
|
|
goto fail;
|
|
} else {
|
|
root->anon_dev = anon_dev;
|
|
}
|
|
}
|
|
|
|
mutex_lock(&root->objectid_mutex);
|
|
ret = btrfs_init_root_free_objectid(root);
|
|
if (ret) {
|
|
mutex_unlock(&root->objectid_mutex);
|
|
goto fail;
|
|
}
|
|
|
|
ASSERT(root->free_objectid <= BTRFS_LAST_FREE_OBJECTID);
|
|
|
|
mutex_unlock(&root->objectid_mutex);
|
|
|
|
return 0;
|
|
fail:
|
|
/* The caller is responsible to call btrfs_free_fs_root */
|
|
return ret;
|
|
}
|
|
|
|
static struct btrfs_root *btrfs_lookup_fs_root(struct btrfs_fs_info *fs_info,
|
|
u64 root_id)
|
|
{
|
|
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);
|
|
if (root)
|
|
root = btrfs_grab_root(root);
|
|
spin_unlock(&fs_info->fs_roots_radix_lock);
|
|
return root;
|
|
}
|
|
|
|
static struct btrfs_root *btrfs_get_global_root(struct btrfs_fs_info *fs_info,
|
|
u64 objectid)
|
|
{
|
|
struct btrfs_key key = {
|
|
.objectid = objectid,
|
|
.type = BTRFS_ROOT_ITEM_KEY,
|
|
.offset = 0,
|
|
};
|
|
|
|
if (objectid == BTRFS_ROOT_TREE_OBJECTID)
|
|
return btrfs_grab_root(fs_info->tree_root);
|
|
if (objectid == BTRFS_EXTENT_TREE_OBJECTID)
|
|
return btrfs_grab_root(btrfs_global_root(fs_info, &key));
|
|
if (objectid == BTRFS_CHUNK_TREE_OBJECTID)
|
|
return btrfs_grab_root(fs_info->chunk_root);
|
|
if (objectid == BTRFS_DEV_TREE_OBJECTID)
|
|
return btrfs_grab_root(fs_info->dev_root);
|
|
if (objectid == BTRFS_CSUM_TREE_OBJECTID)
|
|
return btrfs_grab_root(btrfs_global_root(fs_info, &key));
|
|
if (objectid == BTRFS_QUOTA_TREE_OBJECTID)
|
|
return btrfs_grab_root(fs_info->quota_root) ?
|
|
fs_info->quota_root : ERR_PTR(-ENOENT);
|
|
if (objectid == BTRFS_UUID_TREE_OBJECTID)
|
|
return btrfs_grab_root(fs_info->uuid_root) ?
|
|
fs_info->uuid_root : ERR_PTR(-ENOENT);
|
|
if (objectid == BTRFS_FREE_SPACE_TREE_OBJECTID) {
|
|
struct btrfs_root *root = btrfs_global_root(fs_info, &key);
|
|
|
|
return btrfs_grab_root(root) ? root : ERR_PTR(-ENOENT);
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
int btrfs_insert_fs_root(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_root *root)
|
|
{
|
|
int ret;
|
|
|
|
ret = radix_tree_preload(GFP_NOFS);
|
|
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) {
|
|
btrfs_grab_root(root);
|
|
set_bit(BTRFS_ROOT_IN_RADIX, &root->state);
|
|
}
|
|
spin_unlock(&fs_info->fs_roots_radix_lock);
|
|
radix_tree_preload_end();
|
|
|
|
return ret;
|
|
}
|
|
|
|
void btrfs_check_leaked_roots(struct btrfs_fs_info *fs_info)
|
|
{
|
|
#ifdef CONFIG_BTRFS_DEBUG
|
|
struct btrfs_root *root;
|
|
|
|
while (!list_empty(&fs_info->allocated_roots)) {
|
|
char buf[BTRFS_ROOT_NAME_BUF_LEN];
|
|
|
|
root = list_first_entry(&fs_info->allocated_roots,
|
|
struct btrfs_root, leak_list);
|
|
btrfs_err(fs_info, "leaked root %s refcount %d",
|
|
btrfs_root_name(&root->root_key, buf),
|
|
refcount_read(&root->refs));
|
|
while (refcount_read(&root->refs) > 1)
|
|
btrfs_put_root(root);
|
|
btrfs_put_root(root);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
static void free_global_roots(struct btrfs_fs_info *fs_info)
|
|
{
|
|
struct btrfs_root *root;
|
|
struct rb_node *node;
|
|
|
|
while ((node = rb_first_postorder(&fs_info->global_root_tree)) != NULL) {
|
|
root = rb_entry(node, struct btrfs_root, rb_node);
|
|
rb_erase(&root->rb_node, &fs_info->global_root_tree);
|
|
btrfs_put_root(root);
|
|
}
|
|
}
|
|
|
|
void btrfs_free_fs_info(struct btrfs_fs_info *fs_info)
|
|
{
|
|
percpu_counter_destroy(&fs_info->dirty_metadata_bytes);
|
|
percpu_counter_destroy(&fs_info->delalloc_bytes);
|
|
percpu_counter_destroy(&fs_info->ordered_bytes);
|
|
percpu_counter_destroy(&fs_info->dev_replace.bio_counter);
|
|
btrfs_free_csum_hash(fs_info);
|
|
btrfs_free_stripe_hash_table(fs_info);
|
|
btrfs_free_ref_cache(fs_info);
|
|
kfree(fs_info->balance_ctl);
|
|
kfree(fs_info->delayed_root);
|
|
free_global_roots(fs_info);
|
|
btrfs_put_root(fs_info->tree_root);
|
|
btrfs_put_root(fs_info->chunk_root);
|
|
btrfs_put_root(fs_info->dev_root);
|
|
btrfs_put_root(fs_info->quota_root);
|
|
btrfs_put_root(fs_info->uuid_root);
|
|
btrfs_put_root(fs_info->fs_root);
|
|
btrfs_put_root(fs_info->data_reloc_root);
|
|
btrfs_check_leaked_roots(fs_info);
|
|
btrfs_extent_buffer_leak_debug_check(fs_info);
|
|
kfree(fs_info->super_copy);
|
|
kfree(fs_info->super_for_commit);
|
|
kfree(fs_info->subpage_info);
|
|
kvfree(fs_info);
|
|
}
|
|
|
|
|
|
/*
|
|
* Get an in-memory reference of a root structure.
|
|
*
|
|
* For essential trees like root/extent tree, we grab it from fs_info directly.
|
|
* For subvolume trees, we check the cached filesystem roots first. If not
|
|
* found, then read it from disk and add it to cached fs roots.
|
|
*
|
|
* Caller should release the root by calling btrfs_put_root() after the usage.
|
|
*
|
|
* NOTE: Reloc and log trees can't be read by this function as they share the
|
|
* same root objectid.
|
|
*
|
|
* @objectid: root id
|
|
* @anon_dev: preallocated anonymous block device number for new roots,
|
|
* pass 0 for new allocation.
|
|
* @check_ref: whether to check root item references, If true, return -ENOENT
|
|
* for orphan roots
|
|
*/
|
|
static struct btrfs_root *btrfs_get_root_ref(struct btrfs_fs_info *fs_info,
|
|
u64 objectid, dev_t anon_dev,
|
|
bool check_ref)
|
|
{
|
|
struct btrfs_root *root;
|
|
struct btrfs_path *path;
|
|
struct btrfs_key key;
|
|
int ret;
|
|
|
|
root = btrfs_get_global_root(fs_info, objectid);
|
|
if (root)
|
|
return root;
|
|
again:
|
|
root = btrfs_lookup_fs_root(fs_info, objectid);
|
|
if (root) {
|
|
/* Shouldn't get preallocated anon_dev for cached roots */
|
|
ASSERT(!anon_dev);
|
|
if (check_ref && btrfs_root_refs(&root->root_item) == 0) {
|
|
btrfs_put_root(root);
|
|
return ERR_PTR(-ENOENT);
|
|
}
|
|
return root;
|
|
}
|
|
|
|
key.objectid = objectid;
|
|
key.type = BTRFS_ROOT_ITEM_KEY;
|
|
key.offset = (u64)-1;
|
|
root = btrfs_read_tree_root(fs_info->tree_root, &key);
|
|
if (IS_ERR(root))
|
|
return root;
|
|
|
|
if (check_ref && btrfs_root_refs(&root->root_item) == 0) {
|
|
ret = -ENOENT;
|
|
goto fail;
|
|
}
|
|
|
|
ret = btrfs_init_fs_root(root, anon_dev);
|
|
if (ret)
|
|
goto fail;
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path) {
|
|
ret = -ENOMEM;
|
|
goto fail;
|
|
}
|
|
key.objectid = BTRFS_ORPHAN_OBJECTID;
|
|
key.type = BTRFS_ORPHAN_ITEM_KEY;
|
|
key.offset = objectid;
|
|
|
|
ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0);
|
|
btrfs_free_path(path);
|
|
if (ret < 0)
|
|
goto fail;
|
|
if (ret == 0)
|
|
set_bit(BTRFS_ROOT_ORPHAN_ITEM_INSERTED, &root->state);
|
|
|
|
ret = btrfs_insert_fs_root(fs_info, root);
|
|
if (ret) {
|
|
btrfs_put_root(root);
|
|
if (ret == -EEXIST)
|
|
goto again;
|
|
goto fail;
|
|
}
|
|
return root;
|
|
fail:
|
|
/*
|
|
* If our caller provided us an anonymous device, then it's his
|
|
* responsability to free it in case we fail. So we have to set our
|
|
* root's anon_dev to 0 to avoid a double free, once by btrfs_put_root()
|
|
* and once again by our caller.
|
|
*/
|
|
if (anon_dev)
|
|
root->anon_dev = 0;
|
|
btrfs_put_root(root);
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
/*
|
|
* Get in-memory reference of a root structure
|
|
*
|
|
* @objectid: tree objectid
|
|
* @check_ref: if set, verify that the tree exists and the item has at least
|
|
* one reference
|
|
*/
|
|
struct btrfs_root *btrfs_get_fs_root(struct btrfs_fs_info *fs_info,
|
|
u64 objectid, bool check_ref)
|
|
{
|
|
return btrfs_get_root_ref(fs_info, objectid, 0, check_ref);
|
|
}
|
|
|
|
/*
|
|
* Get in-memory reference of a root structure, created as new, optionally pass
|
|
* the anonymous block device id
|
|
*
|
|
* @objectid: tree objectid
|
|
* @anon_dev: if zero, allocate a new anonymous block device or use the
|
|
* parameter value
|
|
*/
|
|
struct btrfs_root *btrfs_get_new_fs_root(struct btrfs_fs_info *fs_info,
|
|
u64 objectid, dev_t anon_dev)
|
|
{
|
|
return btrfs_get_root_ref(fs_info, objectid, anon_dev, true);
|
|
}
|
|
|
|
/*
|
|
* btrfs_get_fs_root_commit_root - return a root for the given objectid
|
|
* @fs_info: the fs_info
|
|
* @objectid: the objectid we need to lookup
|
|
*
|
|
* This is exclusively used for backref walking, and exists specifically because
|
|
* of how qgroups does lookups. Qgroups will do a backref lookup at delayed ref
|
|
* creation time, which means we may have to read the tree_root in order to look
|
|
* up a fs root that is not in memory. If the root is not in memory we will
|
|
* read the tree root commit root and look up the fs root from there. This is a
|
|
* temporary root, it will not be inserted into the radix tree as it doesn't
|
|
* have the most uptodate information, it'll simply be discarded once the
|
|
* backref code is finished using the root.
|
|
*/
|
|
struct btrfs_root *btrfs_get_fs_root_commit_root(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_path *path,
|
|
u64 objectid)
|
|
{
|
|
struct btrfs_root *root;
|
|
struct btrfs_key key;
|
|
|
|
ASSERT(path->search_commit_root && path->skip_locking);
|
|
|
|
/*
|
|
* This can return -ENOENT if we ask for a root that doesn't exist, but
|
|
* since this is called via the backref walking code we won't be looking
|
|
* up a root that doesn't exist, unless there's corruption. So if root
|
|
* != NULL just return it.
|
|
*/
|
|
root = btrfs_get_global_root(fs_info, objectid);
|
|
if (root)
|
|
return root;
|
|
|
|
root = btrfs_lookup_fs_root(fs_info, objectid);
|
|
if (root)
|
|
return root;
|
|
|
|
key.objectid = objectid;
|
|
key.type = BTRFS_ROOT_ITEM_KEY;
|
|
key.offset = (u64)-1;
|
|
root = read_tree_root_path(fs_info->tree_root, path, &key);
|
|
btrfs_release_path(path);
|
|
|
|
return root;
|
|
}
|
|
|
|
/*
|
|
* 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)
|
|
{
|
|
struct bio *bio;
|
|
struct btrfs_end_io_wq *end_io_wq;
|
|
|
|
end_io_wq = container_of(work, struct btrfs_end_io_wq, work);
|
|
bio = end_io_wq->bio;
|
|
|
|
bio->bi_status = end_io_wq->status;
|
|
bio->bi_private = end_io_wq->private;
|
|
bio->bi_end_io = end_io_wq->end_io;
|
|
bio_endio(bio);
|
|
kmem_cache_free(btrfs_end_io_wq_cache, end_io_wq);
|
|
}
|
|
|
|
static int cleaner_kthread(void *arg)
|
|
{
|
|
struct btrfs_root *root = arg;
|
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
|
int again;
|
|
|
|
while (1) {
|
|
again = 0;
|
|
|
|
set_bit(BTRFS_FS_CLEANER_RUNNING, &fs_info->flags);
|
|
|
|
/* Make the cleaner go to sleep early. */
|
|
if (btrfs_need_cleaner_sleep(fs_info))
|
|
goto sleep;
|
|
|
|
/*
|
|
* Do not do anything if we might cause open_ctree() to block
|
|
* before we have finished mounting the filesystem.
|
|
*/
|
|
if (!test_bit(BTRFS_FS_OPEN, &fs_info->flags))
|
|
goto sleep;
|
|
|
|
if (!mutex_trylock(&fs_info->cleaner_mutex))
|
|
goto sleep;
|
|
|
|
/*
|
|
* Avoid the problem that we change the status of the fs
|
|
* during the above check and trylock.
|
|
*/
|
|
if (btrfs_need_cleaner_sleep(fs_info)) {
|
|
mutex_unlock(&fs_info->cleaner_mutex);
|
|
goto sleep;
|
|
}
|
|
|
|
btrfs_run_delayed_iputs(fs_info);
|
|
|
|
again = btrfs_clean_one_deleted_snapshot(root);
|
|
mutex_unlock(&fs_info->cleaner_mutex);
|
|
|
|
/*
|
|
* The defragger has dealt with the R/O remount and umount,
|
|
* needn't do anything special here.
|
|
*/
|
|
btrfs_run_defrag_inodes(fs_info);
|
|
|
|
/*
|
|
* Acquires fs_info->reclaim_bgs_lock to avoid racing
|
|
* with relocation (btrfs_relocate_chunk) and relocation
|
|
* acquires fs_info->cleaner_mutex (btrfs_relocate_block_group)
|
|
* after acquiring fs_info->reclaim_bgs_lock. So we
|
|
* can't hold, nor need to, fs_info->cleaner_mutex when deleting
|
|
* unused block groups.
|
|
*/
|
|
btrfs_delete_unused_bgs(fs_info);
|
|
|
|
/*
|
|
* Reclaim block groups in the reclaim_bgs list after we deleted
|
|
* all unused block_groups. This possibly gives us some more free
|
|
* space.
|
|
*/
|
|
btrfs_reclaim_bgs(fs_info);
|
|
sleep:
|
|
clear_and_wake_up_bit(BTRFS_FS_CLEANER_RUNNING, &fs_info->flags);
|
|
if (kthread_should_park())
|
|
kthread_parkme();
|
|
if (kthread_should_stop())
|
|
return 0;
|
|
if (!again) {
|
|
set_current_state(TASK_INTERRUPTIBLE);
|
|
schedule();
|
|
__set_current_state(TASK_RUNNING);
|
|
}
|
|
}
|
|
}
|
|
|
|
static int transaction_kthread(void *arg)
|
|
{
|
|
struct btrfs_root *root = arg;
|
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
|
struct btrfs_trans_handle *trans;
|
|
struct btrfs_transaction *cur;
|
|
u64 transid;
|
|
time64_t delta;
|
|
unsigned long delay;
|
|
bool cannot_commit;
|
|
|
|
do {
|
|
cannot_commit = false;
|
|
delay = msecs_to_jiffies(fs_info->commit_interval * 1000);
|
|
mutex_lock(&fs_info->transaction_kthread_mutex);
|
|
|
|
spin_lock(&fs_info->trans_lock);
|
|
cur = fs_info->running_transaction;
|
|
if (!cur) {
|
|
spin_unlock(&fs_info->trans_lock);
|
|
goto sleep;
|
|
}
|
|
|
|
delta = ktime_get_seconds() - cur->start_time;
|
|
if (!test_and_clear_bit(BTRFS_FS_COMMIT_TRANS, &fs_info->flags) &&
|
|
cur->state < TRANS_STATE_COMMIT_START &&
|
|
delta < fs_info->commit_interval) {
|
|
spin_unlock(&fs_info->trans_lock);
|
|
delay -= msecs_to_jiffies((delta - 1) * 1000);
|
|
delay = min(delay,
|
|
msecs_to_jiffies(fs_info->commit_interval * 1000));
|
|
goto sleep;
|
|
}
|
|
transid = cur->transid;
|
|
spin_unlock(&fs_info->trans_lock);
|
|
|
|
/* If the file system is aborted, this will always fail. */
|
|
trans = btrfs_attach_transaction(root);
|
|
if (IS_ERR(trans)) {
|
|
if (PTR_ERR(trans) != -ENOENT)
|
|
cannot_commit = true;
|
|
goto sleep;
|
|
}
|
|
if (transid == trans->transid) {
|
|
btrfs_commit_transaction(trans);
|
|
} else {
|
|
btrfs_end_transaction(trans);
|
|
}
|
|
sleep:
|
|
wake_up_process(fs_info->cleaner_kthread);
|
|
mutex_unlock(&fs_info->transaction_kthread_mutex);
|
|
|
|
if (BTRFS_FS_ERROR(fs_info))
|
|
btrfs_cleanup_transaction(fs_info);
|
|
if (!kthread_should_stop() &&
|
|
(!btrfs_transaction_blocked(fs_info) ||
|
|
cannot_commit))
|
|
schedule_timeout_interruptible(delay);
|
|
} while (!kthread_should_stop());
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* This will find the highest generation in the array of root backups. The
|
|
* index of the highest array is returned, or -EINVAL 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)
|
|
{
|
|
const u64 newest_gen = btrfs_super_generation(info->super_copy);
|
|
u64 cur;
|
|
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)
|
|
return i;
|
|
}
|
|
|
|
return -EINVAL;
|
|
}
|
|
|
|
/*
|
|
* 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)
|
|
{
|
|
const int next_backup = info->backup_root_index;
|
|
struct btrfs_root_backup *root_backup;
|
|
struct btrfs_root *extent_root = btrfs_extent_root(info, 0);
|
|
struct btrfs_root *csum_root = btrfs_csum_root(info, 0);
|
|
|
|
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, extent_root->node->start);
|
|
btrfs_set_backup_extent_root_gen(root_backup,
|
|
btrfs_header_generation(extent_root->node));
|
|
btrfs_set_backup_extent_root_level(root_backup,
|
|
btrfs_header_level(extent_root->node));
|
|
|
|
/*
|
|
* 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,
|
|
btrfs_header_generation(info->fs_root->node));
|
|
btrfs_set_backup_fs_root_level(root_backup,
|
|
btrfs_header_level(info->fs_root->node));
|
|
}
|
|
|
|
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, csum_root->node->start);
|
|
btrfs_set_backup_csum_root_gen(root_backup,
|
|
btrfs_header_generation(csum_root->node));
|
|
btrfs_set_backup_csum_root_level(root_backup,
|
|
btrfs_header_level(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);
|
|
}
|
|
|
|
/*
|
|
* read_backup_root - Reads a backup root based on the passed priority. Prio 0
|
|
* is the newest, prio 1/2/3 are 2nd newest/3rd newest/4th (oldest) backup roots
|
|
*
|
|
* fs_info - filesystem whose backup roots need to be read
|
|
* priority - priority of backup root required
|
|
*
|
|
* Returns backup root index on success and -EINVAL otherwise.
|
|
*/
|
|
static int read_backup_root(struct btrfs_fs_info *fs_info, u8 priority)
|
|
{
|
|
int backup_index = find_newest_super_backup(fs_info);
|
|
struct btrfs_super_block *super = fs_info->super_copy;
|
|
struct btrfs_root_backup *root_backup;
|
|
|
|
if (priority < BTRFS_NUM_BACKUP_ROOTS && backup_index >= 0) {
|
|
if (priority == 0)
|
|
return backup_index;
|
|
|
|
backup_index = backup_index + BTRFS_NUM_BACKUP_ROOTS - priority;
|
|
backup_index %= BTRFS_NUM_BACKUP_ROOTS;
|
|
} else {
|
|
return -EINVAL;
|
|
}
|
|
|
|
root_backup = super->super_roots + backup_index;
|
|
|
|
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 backup_index;
|
|
}
|
|
|
|
/* helper to cleanup workers */
|
|
static void btrfs_stop_all_workers(struct btrfs_fs_info *fs_info)
|
|
{
|
|
btrfs_destroy_workqueue(fs_info->fixup_workers);
|
|
btrfs_destroy_workqueue(fs_info->delalloc_workers);
|
|
btrfs_destroy_workqueue(fs_info->workers);
|
|
btrfs_destroy_workqueue(fs_info->endio_workers);
|
|
btrfs_destroy_workqueue(fs_info->endio_raid56_workers);
|
|
btrfs_destroy_workqueue(fs_info->rmw_workers);
|
|
btrfs_destroy_workqueue(fs_info->endio_write_workers);
|
|
btrfs_destroy_workqueue(fs_info->endio_freespace_worker);
|
|
btrfs_destroy_workqueue(fs_info->delayed_workers);
|
|
btrfs_destroy_workqueue(fs_info->caching_workers);
|
|
btrfs_destroy_workqueue(fs_info->flush_workers);
|
|
btrfs_destroy_workqueue(fs_info->qgroup_rescan_workers);
|
|
if (fs_info->discard_ctl.discard_workers)
|
|
destroy_workqueue(fs_info->discard_ctl.discard_workers);
|
|
/*
|
|
* Now that all other work queues are destroyed, we can safely destroy
|
|
* the queues used for metadata I/O, since tasks from those other work
|
|
* queues can do metadata I/O operations.
|
|
*/
|
|
btrfs_destroy_workqueue(fs_info->endio_meta_workers);
|
|
btrfs_destroy_workqueue(fs_info->endio_meta_write_workers);
|
|
}
|
|
|
|
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;
|
|
}
|
|
}
|
|
|
|
static void free_global_root_pointers(struct btrfs_fs_info *fs_info)
|
|
{
|
|
struct btrfs_root *root, *tmp;
|
|
|
|
rbtree_postorder_for_each_entry_safe(root, tmp,
|
|
&fs_info->global_root_tree,
|
|
rb_node)
|
|
free_root_extent_buffers(root);
|
|
}
|
|
|
|
/* helper to cleanup tree roots */
|
|
static void free_root_pointers(struct btrfs_fs_info *info, bool free_chunk_root)
|
|
{
|
|
free_root_extent_buffers(info->tree_root);
|
|
|
|
free_global_root_pointers(info);
|
|
free_root_extent_buffers(info->dev_root);
|
|
free_root_extent_buffers(info->quota_root);
|
|
free_root_extent_buffers(info->uuid_root);
|
|
free_root_extent_buffers(info->fs_root);
|
|
free_root_extent_buffers(info->data_reloc_root);
|
|
if (free_chunk_root)
|
|
free_root_extent_buffers(info->chunk_root);
|
|
}
|
|
|
|
void btrfs_put_root(struct btrfs_root *root)
|
|
{
|
|
if (!root)
|
|
return;
|
|
|
|
if (refcount_dec_and_test(&root->refs)) {
|
|
WARN_ON(!RB_EMPTY_ROOT(&root->inode_tree));
|
|
WARN_ON(test_bit(BTRFS_ROOT_DEAD_RELOC_TREE, &root->state));
|
|
if (root->anon_dev)
|
|
free_anon_bdev(root->anon_dev);
|
|
btrfs_drew_lock_destroy(&root->snapshot_lock);
|
|
free_root_extent_buffers(root);
|
|
#ifdef CONFIG_BTRFS_DEBUG
|
|
spin_lock(&root->fs_info->fs_roots_radix_lock);
|
|
list_del_init(&root->leak_list);
|
|
spin_unlock(&root->fs_info->fs_roots_radix_lock);
|
|
#endif
|
|
kfree(root);
|
|
}
|
|
}
|
|
|
|
void btrfs_free_fs_roots(struct btrfs_fs_info *fs_info)
|
|
{
|
|
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);
|
|
|
|
if (test_bit(BTRFS_ROOT_IN_RADIX, &gang[0]->state))
|
|
btrfs_drop_and_free_fs_root(fs_info, gang[0]);
|
|
btrfs_put_root(gang[0]);
|
|
}
|
|
|
|
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++)
|
|
btrfs_drop_and_free_fs_root(fs_info, gang[i]);
|
|
}
|
|
}
|
|
|
|
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);
|
|
refcount_set(&fs_info->scrub_workers_refcnt, 0);
|
|
}
|
|
|
|
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_pause_req, 0);
|
|
atomic_set(&fs_info->balance_cancel_req, 0);
|
|
fs_info->balance_ctl = NULL;
|
|
init_waitqueue_head(&fs_info->balance_wait_q);
|
|
atomic_set(&fs_info->reloc_cancel_req, 0);
|
|
}
|
|
|
|
static void btrfs_init_btree_inode(struct btrfs_fs_info *fs_info)
|
|
{
|
|
struct inode *inode = fs_info->btree_inode;
|
|
|
|
inode->i_ino = BTRFS_BTREE_INODE_OBJECTID;
|
|
set_nlink(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
|
|
*/
|
|
inode->i_size = OFFSET_MAX;
|
|
inode->i_mapping->a_ops = &btree_aops;
|
|
|
|
RB_CLEAR_NODE(&BTRFS_I(inode)->rb_node);
|
|
extent_io_tree_init(fs_info, &BTRFS_I(inode)->io_tree,
|
|
IO_TREE_BTREE_INODE_IO, inode);
|
|
BTRFS_I(inode)->io_tree.track_uptodate = false;
|
|
extent_map_tree_init(&BTRFS_I(inode)->extent_tree);
|
|
|
|
BTRFS_I(inode)->root = btrfs_grab_root(fs_info->tree_root);
|
|
memset(&BTRFS_I(inode)->location, 0, sizeof(struct btrfs_key));
|
|
set_bit(BTRFS_INODE_DUMMY, &BTRFS_I(inode)->runtime_flags);
|
|
btrfs_insert_inode_hash(inode);
|
|
}
|
|
|
|
static void btrfs_init_dev_replace_locks(struct btrfs_fs_info *fs_info)
|
|
{
|
|
mutex_init(&fs_info->dev_replace.lock_finishing_cancel_unmount);
|
|
init_rwsem(&fs_info->dev_replace.rwsem);
|
|
init_waitqueue_head(&fs_info->dev_replace.replace_wait);
|
|
}
|
|
|
|
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;
|
|
INIT_LIST_HEAD(&fs_info->dirty_qgroups);
|
|
fs_info->qgroup_seq = 1;
|
|
fs_info->qgroup_ulist = NULL;
|
|
fs_info->qgroup_rescan_running = false;
|
|
mutex_init(&fs_info->qgroup_rescan_lock);
|
|
}
|
|
|
|
static int btrfs_init_workqueues(struct btrfs_fs_info *fs_info)
|
|
{
|
|
u32 max_active = fs_info->thread_pool_size;
|
|
unsigned int flags = WQ_MEM_RECLAIM | WQ_FREEZABLE | WQ_UNBOUND;
|
|
|
|
fs_info->workers =
|
|
btrfs_alloc_workqueue(fs_info, "worker",
|
|
flags | WQ_HIGHPRI, max_active, 16);
|
|
|
|
fs_info->delalloc_workers =
|
|
btrfs_alloc_workqueue(fs_info, "delalloc",
|
|
flags, max_active, 2);
|
|
|
|
fs_info->flush_workers =
|
|
btrfs_alloc_workqueue(fs_info, "flush_delalloc",
|
|
flags, max_active, 0);
|
|
|
|
fs_info->caching_workers =
|
|
btrfs_alloc_workqueue(fs_info, "cache", flags, max_active, 0);
|
|
|
|
fs_info->fixup_workers =
|
|
btrfs_alloc_workqueue(fs_info, "fixup", flags, 1, 0);
|
|
|
|
/*
|
|
* endios are largely parallel and should have a very
|
|
* low idle thresh
|
|
*/
|
|
fs_info->endio_workers =
|
|
btrfs_alloc_workqueue(fs_info, "endio", flags, max_active, 4);
|
|
fs_info->endio_meta_workers =
|
|
btrfs_alloc_workqueue(fs_info, "endio-meta", flags,
|
|
max_active, 4);
|
|
fs_info->endio_meta_write_workers =
|
|
btrfs_alloc_workqueue(fs_info, "endio-meta-write", flags,
|
|
max_active, 2);
|
|
fs_info->endio_raid56_workers =
|
|
btrfs_alloc_workqueue(fs_info, "endio-raid56", flags,
|
|
max_active, 4);
|
|
fs_info->rmw_workers =
|
|
btrfs_alloc_workqueue(fs_info, "rmw", flags, max_active, 2);
|
|
fs_info->endio_write_workers =
|
|
btrfs_alloc_workqueue(fs_info, "endio-write", flags,
|
|
max_active, 2);
|
|
fs_info->endio_freespace_worker =
|
|
btrfs_alloc_workqueue(fs_info, "freespace-write", flags,
|
|
max_active, 0);
|
|
fs_info->delayed_workers =
|
|
btrfs_alloc_workqueue(fs_info, "delayed-meta", flags,
|
|
max_active, 0);
|
|
fs_info->qgroup_rescan_workers =
|
|
btrfs_alloc_workqueue(fs_info, "qgroup-rescan", flags, 1, 0);
|
|
fs_info->discard_ctl.discard_workers =
|
|
alloc_workqueue("btrfs_discard", WQ_UNBOUND | WQ_FREEZABLE, 1);
|
|
|
|
if (!(fs_info->workers && fs_info->delalloc_workers &&
|
|
fs_info->flush_workers &&
|
|
fs_info->endio_workers && fs_info->endio_meta_workers &&
|
|
fs_info->endio_meta_write_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->fixup_workers &&
|
|
fs_info->delayed_workers && fs_info->qgroup_rescan_workers &&
|
|
fs_info->discard_ctl.discard_workers)) {
|
|
return -ENOMEM;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int btrfs_init_csum_hash(struct btrfs_fs_info *fs_info, u16 csum_type)
|
|
{
|
|
struct crypto_shash *csum_shash;
|
|
const char *csum_driver = btrfs_super_csum_driver(csum_type);
|
|
|
|
csum_shash = crypto_alloc_shash(csum_driver, 0, 0);
|
|
|
|
if (IS_ERR(csum_shash)) {
|
|
btrfs_err(fs_info, "error allocating %s hash for checksum",
|
|
csum_driver);
|
|
return PTR_ERR(csum_shash);
|
|
}
|
|
|
|
fs_info->csum_shash = csum_shash;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int btrfs_replay_log(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_fs_devices *fs_devices)
|
|
{
|
|
int ret;
|
|
struct btrfs_root *log_tree_root;
|
|
struct btrfs_super_block *disk_super = fs_info->super_copy;
|
|
u64 bytenr = btrfs_super_log_root(disk_super);
|
|
int level = btrfs_super_log_root_level(disk_super);
|
|
|
|
if (fs_devices->rw_devices == 0) {
|
|
btrfs_warn(fs_info, "log replay required on RO media");
|
|
return -EIO;
|
|
}
|
|
|
|
log_tree_root = btrfs_alloc_root(fs_info, BTRFS_TREE_LOG_OBJECTID,
|
|
GFP_KERNEL);
|
|
if (!log_tree_root)
|
|
return -ENOMEM;
|
|
|
|
log_tree_root->node = read_tree_block(fs_info, bytenr,
|
|
BTRFS_TREE_LOG_OBJECTID,
|
|
fs_info->generation + 1, level,
|
|
NULL);
|
|
if (IS_ERR(log_tree_root->node)) {
|
|
btrfs_warn(fs_info, "failed to read log tree");
|
|
ret = PTR_ERR(log_tree_root->node);
|
|
log_tree_root->node = NULL;
|
|
btrfs_put_root(log_tree_root);
|
|
return ret;
|
|
} else if (!extent_buffer_uptodate(log_tree_root->node)) {
|
|
btrfs_err(fs_info, "failed to read log tree");
|
|
btrfs_put_root(log_tree_root);
|
|
return -EIO;
|
|
}
|
|
/* returns with log_tree_root freed on success */
|
|
ret = btrfs_recover_log_trees(log_tree_root);
|
|
if (ret) {
|
|
btrfs_handle_fs_error(fs_info, ret,
|
|
"Failed to recover log tree");
|
|
btrfs_put_root(log_tree_root);
|
|
return ret;
|
|
}
|
|
|
|
if (sb_rdonly(fs_info->sb)) {
|
|
ret = btrfs_commit_super(fs_info);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int load_global_roots_objectid(struct btrfs_root *tree_root,
|
|
struct btrfs_path *path, u64 objectid,
|
|
const char *name)
|
|
{
|
|
struct btrfs_fs_info *fs_info = tree_root->fs_info;
|
|
struct btrfs_root *root;
|
|
int ret;
|
|
struct btrfs_key key = {
|
|
.objectid = objectid,
|
|
.type = BTRFS_ROOT_ITEM_KEY,
|
|
.offset = 0,
|
|
};
|
|
bool found = false;
|
|
|
|
/* If we have IGNOREDATACSUMS skip loading these roots. */
|
|
if (objectid == BTRFS_CSUM_TREE_OBJECTID &&
|
|
btrfs_test_opt(fs_info, IGNOREDATACSUMS)) {
|
|
set_bit(BTRFS_FS_STATE_NO_CSUMS, &fs_info->fs_state);
|
|
return 0;
|
|
}
|
|
|
|
while (1) {
|
|
ret = btrfs_search_slot(NULL, tree_root, &key, path, 0, 0);
|
|
if (ret < 0)
|
|
break;
|
|
|
|
if (path->slots[0] >= btrfs_header_nritems(path->nodes[0])) {
|
|
ret = btrfs_next_leaf(tree_root, path);
|
|
if (ret) {
|
|
if (ret > 0)
|
|
ret = 0;
|
|
break;
|
|
}
|
|
}
|
|
ret = 0;
|
|
|
|
btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
|
|
if (key.objectid != objectid)
|
|
break;
|
|
btrfs_release_path(path);
|
|
|
|
found = true;
|
|
root = read_tree_root_path(tree_root, path, &key);
|
|
if (IS_ERR(root)) {
|
|
if (!btrfs_test_opt(fs_info, IGNOREBADROOTS))
|
|
ret = PTR_ERR(root);
|
|
break;
|
|
}
|
|
set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
|
|
ret = btrfs_global_root_insert(root);
|
|
if (ret) {
|
|
btrfs_put_root(root);
|
|
break;
|
|
}
|
|
key.offset++;
|
|
}
|
|
btrfs_release_path(path);
|
|
|
|
if (!found || ret) {
|
|
if (objectid == BTRFS_CSUM_TREE_OBJECTID)
|
|
set_bit(BTRFS_FS_STATE_NO_CSUMS, &fs_info->fs_state);
|
|
|
|
if (!btrfs_test_opt(fs_info, IGNOREBADROOTS))
|
|
ret = ret ? ret : -ENOENT;
|
|
else
|
|
ret = 0;
|
|
btrfs_err(fs_info, "failed to load root %s", name);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int load_global_roots(struct btrfs_root *tree_root)
|
|
{
|
|
struct btrfs_path *path;
|
|
int ret = 0;
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
|
|
ret = load_global_roots_objectid(tree_root, path,
|
|
BTRFS_EXTENT_TREE_OBJECTID, "extent");
|
|
if (ret)
|
|
goto out;
|
|
ret = load_global_roots_objectid(tree_root, path,
|
|
BTRFS_CSUM_TREE_OBJECTID, "csum");
|
|
if (ret)
|
|
goto out;
|
|
if (!btrfs_fs_compat_ro(tree_root->fs_info, FREE_SPACE_TREE))
|
|
goto out;
|
|
ret = load_global_roots_objectid(tree_root, path,
|
|
BTRFS_FREE_SPACE_TREE_OBJECTID,
|
|
"free space");
|
|
out:
|
|
btrfs_free_path(path);
|
|
return ret;
|
|
}
|
|
|
|
static int btrfs_read_roots(struct btrfs_fs_info *fs_info)
|
|
{
|
|
struct btrfs_root *tree_root = fs_info->tree_root;
|
|
struct btrfs_root *root;
|
|
struct btrfs_key location;
|
|
int ret;
|
|
|
|
BUG_ON(!fs_info->tree_root);
|
|
|
|
ret = load_global_roots(tree_root);
|
|
if (ret)
|
|
return ret;
|
|
|
|
location.objectid = BTRFS_DEV_TREE_OBJECTID;
|
|
location.type = BTRFS_ROOT_ITEM_KEY;
|
|
location.offset = 0;
|
|
|
|
root = btrfs_read_tree_root(tree_root, &location);
|
|
if (IS_ERR(root)) {
|
|
if (!btrfs_test_opt(fs_info, IGNOREBADROOTS)) {
|
|
ret = PTR_ERR(root);
|
|
goto out;
|
|
}
|
|
} else {
|
|
set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
|
|
fs_info->dev_root = root;
|
|
}
|
|
/* Initialize fs_info for all devices in any case */
|
|
btrfs_init_devices_late(fs_info);
|
|
|
|
/*
|
|
* This tree can share blocks with some other fs tree during relocation
|
|
* and we need a proper setup by btrfs_get_fs_root
|
|
*/
|
|
root = btrfs_get_fs_root(tree_root->fs_info,
|
|
BTRFS_DATA_RELOC_TREE_OBJECTID, true);
|
|
if (IS_ERR(root)) {
|
|
if (!btrfs_test_opt(fs_info, IGNOREBADROOTS)) {
|
|
ret = PTR_ERR(root);
|
|
goto out;
|
|
}
|
|
} else {
|
|
set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
|
|
fs_info->data_reloc_root = root;
|
|
}
|
|
|
|
location.objectid = BTRFS_QUOTA_TREE_OBJECTID;
|
|
root = btrfs_read_tree_root(tree_root, &location);
|
|
if (!IS_ERR(root)) {
|
|
set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
|
|
set_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags);
|
|
fs_info->quota_root = root;
|
|
}
|
|
|
|
location.objectid = BTRFS_UUID_TREE_OBJECTID;
|
|
root = btrfs_read_tree_root(tree_root, &location);
|
|
if (IS_ERR(root)) {
|
|
if (!btrfs_test_opt(fs_info, IGNOREBADROOTS)) {
|
|
ret = PTR_ERR(root);
|
|
if (ret != -ENOENT)
|
|
goto out;
|
|
}
|
|
} else {
|
|
set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
|
|
fs_info->uuid_root = root;
|
|
}
|
|
|
|
return 0;
|
|
out:
|
|
btrfs_warn(fs_info, "failed to read root (objectid=%llu): %d",
|
|
location.objectid, ret);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Real super block validation
|
|
* NOTE: super csum type and incompat features will not be checked here.
|
|
*
|
|
* @sb: super block to check
|
|
* @mirror_num: the super block number to check its bytenr:
|
|
* 0 the primary (1st) sb
|
|
* 1, 2 2nd and 3rd backup copy
|
|
* -1 skip bytenr check
|
|
*/
|
|
static int validate_super(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_super_block *sb, int mirror_num)
|
|
{
|
|
u64 nodesize = btrfs_super_nodesize(sb);
|
|
u64 sectorsize = btrfs_super_sectorsize(sb);
|
|
int ret = 0;
|
|
|
|
if (btrfs_super_magic(sb) != BTRFS_MAGIC) {
|
|
btrfs_err(fs_info, "no valid FS found");
|
|
ret = -EINVAL;
|
|
}
|
|
if (btrfs_super_flags(sb) & ~BTRFS_SUPER_FLAG_SUPP) {
|
|
btrfs_err(fs_info, "unrecognized or unsupported super flag: %llu",
|
|
btrfs_super_flags(sb) & ~BTRFS_SUPER_FLAG_SUPP);
|
|
ret = -EINVAL;
|
|
}
|
|
if (btrfs_super_root_level(sb) >= BTRFS_MAX_LEVEL) {
|
|
btrfs_err(fs_info, "tree_root level too big: %d >= %d",
|
|
btrfs_super_root_level(sb), BTRFS_MAX_LEVEL);
|
|
ret = -EINVAL;
|
|
}
|
|
if (btrfs_super_chunk_root_level(sb) >= BTRFS_MAX_LEVEL) {
|
|
btrfs_err(fs_info, "chunk_root level too big: %d >= %d",
|
|
btrfs_super_chunk_root_level(sb), BTRFS_MAX_LEVEL);
|
|
ret = -EINVAL;
|
|
}
|
|
if (btrfs_super_log_root_level(sb) >= BTRFS_MAX_LEVEL) {
|
|
btrfs_err(fs_info, "log_root level too big: %d >= %d",
|
|
btrfs_super_log_root_level(sb), BTRFS_MAX_LEVEL);
|
|
ret = -EINVAL;
|
|
}
|
|
|
|
/*
|
|
* Check sectorsize and nodesize first, other check will need it.
|
|
* Check all possible sectorsize(4K, 8K, 16K, 32K, 64K) here.
|
|
*/
|
|
if (!is_power_of_2(sectorsize) || sectorsize < 4096 ||
|
|
sectorsize > BTRFS_MAX_METADATA_BLOCKSIZE) {
|
|
btrfs_err(fs_info, "invalid sectorsize %llu", sectorsize);
|
|
ret = -EINVAL;
|
|
}
|
|
|
|
/*
|
|
* For 4K page size, we only support 4K sector size.
|
|
* For 64K page size, we support 64K and 4K sector sizes.
|
|
*/
|
|
if ((PAGE_SIZE == SZ_4K && sectorsize != PAGE_SIZE) ||
|
|
(PAGE_SIZE == SZ_64K && (sectorsize != SZ_4K &&
|
|
sectorsize != SZ_64K))) {
|
|
btrfs_err(fs_info,
|
|
"sectorsize %llu not yet supported for page size %lu",
|
|
sectorsize, PAGE_SIZE);
|
|
ret = -EINVAL;
|
|
}
|
|
|
|
if (!is_power_of_2(nodesize) || nodesize < sectorsize ||
|
|
nodesize > BTRFS_MAX_METADATA_BLOCKSIZE) {
|
|
btrfs_err(fs_info, "invalid nodesize %llu", nodesize);
|
|
ret = -EINVAL;
|
|
}
|
|
if (nodesize != le32_to_cpu(sb->__unused_leafsize)) {
|
|
btrfs_err(fs_info, "invalid leafsize %u, should be %llu",
|
|
le32_to_cpu(sb->__unused_leafsize), nodesize);
|
|
ret = -EINVAL;
|
|
}
|
|
|
|
/* Root alignment check */
|
|
if (!IS_ALIGNED(btrfs_super_root(sb), sectorsize)) {
|
|
btrfs_warn(fs_info, "tree_root block unaligned: %llu",
|
|
btrfs_super_root(sb));
|
|
ret = -EINVAL;
|
|
}
|
|
if (!IS_ALIGNED(btrfs_super_chunk_root(sb), sectorsize)) {
|
|
btrfs_warn(fs_info, "chunk_root block unaligned: %llu",
|
|
btrfs_super_chunk_root(sb));
|
|
ret = -EINVAL;
|
|
}
|
|
if (!IS_ALIGNED(btrfs_super_log_root(sb), sectorsize)) {
|
|
btrfs_warn(fs_info, "log_root block unaligned: %llu",
|
|
btrfs_super_log_root(sb));
|
|
ret = -EINVAL;
|
|
}
|
|
|
|
if (memcmp(fs_info->fs_devices->fsid, fs_info->super_copy->fsid,
|
|
BTRFS_FSID_SIZE)) {
|
|
btrfs_err(fs_info,
|
|
"superblock fsid doesn't match fsid of fs_devices: %pU != %pU",
|
|
fs_info->super_copy->fsid, fs_info->fs_devices->fsid);
|
|
ret = -EINVAL;
|
|
}
|
|
|
|
if (btrfs_fs_incompat(fs_info, METADATA_UUID) &&
|
|
memcmp(fs_info->fs_devices->metadata_uuid,
|
|
fs_info->super_copy->metadata_uuid, BTRFS_FSID_SIZE)) {
|
|
btrfs_err(fs_info,
|
|
"superblock metadata_uuid doesn't match metadata uuid of fs_devices: %pU != %pU",
|
|
fs_info->super_copy->metadata_uuid,
|
|
fs_info->fs_devices->metadata_uuid);
|
|
ret = -EINVAL;
|
|
}
|
|
|
|
if (memcmp(fs_info->fs_devices->metadata_uuid, sb->dev_item.fsid,
|
|
BTRFS_FSID_SIZE) != 0) {
|
|
btrfs_err(fs_info,
|
|
"dev_item UUID does not match metadata fsid: %pU != %pU",
|
|
fs_info->fs_devices->metadata_uuid, sb->dev_item.fsid);
|
|
ret = -EINVAL;
|
|
}
|
|
|
|
/*
|
|
* Hint to catch really bogus numbers, bitflips or so, more exact checks are
|
|
* done later
|
|
*/
|
|
if (btrfs_super_bytes_used(sb) < 6 * btrfs_super_nodesize(sb)) {
|
|
btrfs_err(fs_info, "bytes_used is too small %llu",
|
|
btrfs_super_bytes_used(sb));
|
|
ret = -EINVAL;
|
|
}
|
|
if (!is_power_of_2(btrfs_super_stripesize(sb))) {
|
|
btrfs_err(fs_info, "invalid stripesize %u",
|
|
btrfs_super_stripesize(sb));
|
|
ret = -EINVAL;
|
|
}
|
|
if (btrfs_super_num_devices(sb) > (1UL << 31))
|
|
btrfs_warn(fs_info, "suspicious number of devices: %llu",
|
|
btrfs_super_num_devices(sb));
|
|
if (btrfs_super_num_devices(sb) == 0) {
|
|
btrfs_err(fs_info, "number of devices is 0");
|
|
ret = -EINVAL;
|
|
}
|
|
|
|
if (mirror_num >= 0 &&
|
|
btrfs_super_bytenr(sb) != btrfs_sb_offset(mirror_num)) {
|
|
btrfs_err(fs_info, "super offset mismatch %llu != %u",
|
|
btrfs_super_bytenr(sb), BTRFS_SUPER_INFO_OFFSET);
|
|
ret = -EINVAL;
|
|
}
|
|
|
|
/*
|
|
* 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) {
|
|
btrfs_err(fs_info, "system chunk array too big %u > %u",
|
|
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)) {
|
|
btrfs_err(fs_info, "system chunk array too small %u < %zu",
|
|
btrfs_super_sys_array_size(sb),
|
|
sizeof(struct btrfs_disk_key)
|
|
+ sizeof(struct btrfs_chunk));
|
|
ret = -EINVAL;
|
|
}
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
if (btrfs_super_generation(sb) < btrfs_super_chunk_root_generation(sb))
|
|
btrfs_warn(fs_info,
|
|
"suspicious: generation < chunk_root_generation: %llu < %llu",
|
|
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)
|
|
btrfs_warn(fs_info,
|
|
"suspicious: generation < cache_generation: %llu < %llu",
|
|
btrfs_super_generation(sb),
|
|
btrfs_super_cache_generation(sb));
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Validation of super block at mount time.
|
|
* Some checks already done early at mount time, like csum type and incompat
|
|
* flags will be skipped.
|
|
*/
|
|
static int btrfs_validate_mount_super(struct btrfs_fs_info *fs_info)
|
|
{
|
|
return validate_super(fs_info, fs_info->super_copy, 0);
|
|
}
|
|
|
|
/*
|
|
* Validation of super block at write time.
|
|
* Some checks like bytenr check will be skipped as their values will be
|
|
* overwritten soon.
|
|
* Extra checks like csum type and incompat flags will be done here.
|
|
*/
|
|
static int btrfs_validate_write_super(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_super_block *sb)
|
|
{
|
|
int ret;
|
|
|
|
ret = validate_super(fs_info, sb, -1);
|
|
if (ret < 0)
|
|
goto out;
|
|
if (!btrfs_supported_super_csum(btrfs_super_csum_type(sb))) {
|
|
ret = -EUCLEAN;
|
|
btrfs_err(fs_info, "invalid csum type, has %u want %u",
|
|
btrfs_super_csum_type(sb), BTRFS_CSUM_TYPE_CRC32);
|
|
goto out;
|
|
}
|
|
if (btrfs_super_incompat_flags(sb) & ~BTRFS_FEATURE_INCOMPAT_SUPP) {
|
|
ret = -EUCLEAN;
|
|
btrfs_err(fs_info,
|
|
"invalid incompat flags, has 0x%llx valid mask 0x%llx",
|
|
btrfs_super_incompat_flags(sb),
|
|
(unsigned long long)BTRFS_FEATURE_INCOMPAT_SUPP);
|
|
goto out;
|
|
}
|
|
out:
|
|
if (ret < 0)
|
|
btrfs_err(fs_info,
|
|
"super block corruption detected before writing it to disk");
|
|
return ret;
|
|
}
|
|
|
|
static int __cold init_tree_roots(struct btrfs_fs_info *fs_info)
|
|
{
|
|
int backup_index = find_newest_super_backup(fs_info);
|
|
struct btrfs_super_block *sb = fs_info->super_copy;
|
|
struct btrfs_root *tree_root = fs_info->tree_root;
|
|
bool handle_error = false;
|
|
int ret = 0;
|
|
int i;
|
|
|
|
for (i = 0; i < BTRFS_NUM_BACKUP_ROOTS; i++) {
|
|
u64 generation;
|
|
int level;
|
|
|
|
if (handle_error) {
|
|
if (!IS_ERR(tree_root->node))
|
|
free_extent_buffer(tree_root->node);
|
|
tree_root->node = NULL;
|
|
|
|
if (!btrfs_test_opt(fs_info, USEBACKUPROOT))
|
|
break;
|
|
|
|
free_root_pointers(fs_info, 0);
|
|
|
|
/*
|
|
* Don't use the log in recovery mode, it won't be
|
|
* valid
|
|
*/
|
|
btrfs_set_super_log_root(sb, 0);
|
|
|
|
/* We can't trust the free space cache either */
|
|
btrfs_set_opt(fs_info->mount_opt, CLEAR_CACHE);
|
|
|
|
ret = read_backup_root(fs_info, i);
|
|
backup_index = ret;
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
generation = btrfs_super_generation(sb);
|
|
level = btrfs_super_root_level(sb);
|
|
tree_root->node = read_tree_block(fs_info, btrfs_super_root(sb),
|
|
BTRFS_ROOT_TREE_OBJECTID,
|
|
generation, level, NULL);
|
|
if (IS_ERR(tree_root->node)) {
|
|
handle_error = true;
|
|
ret = PTR_ERR(tree_root->node);
|
|
tree_root->node = NULL;
|
|
btrfs_warn(fs_info, "couldn't read tree root");
|
|
continue;
|
|
|
|
} else if (!extent_buffer_uptodate(tree_root->node)) {
|
|
handle_error = true;
|
|
ret = -EIO;
|
|
btrfs_warn(fs_info, "error while reading tree root");
|
|
continue;
|
|
}
|
|
|
|
btrfs_set_root_node(&tree_root->root_item, tree_root->node);
|
|
tree_root->commit_root = btrfs_root_node(tree_root);
|
|
btrfs_set_root_refs(&tree_root->root_item, 1);
|
|
|
|
/*
|
|
* No need to hold btrfs_root::objectid_mutex since the fs
|
|
* hasn't been fully initialised and we are the only user
|
|
*/
|
|
ret = btrfs_init_root_free_objectid(tree_root);
|
|
if (ret < 0) {
|
|
handle_error = true;
|
|
continue;
|
|
}
|
|
|
|
ASSERT(tree_root->free_objectid <= BTRFS_LAST_FREE_OBJECTID);
|
|
|
|
ret = btrfs_read_roots(fs_info);
|
|
if (ret < 0) {
|
|
handle_error = true;
|
|
continue;
|
|
}
|
|
|
|
/* All successful */
|
|
fs_info->generation = generation;
|
|
fs_info->last_trans_committed = generation;
|
|
fs_info->last_reloc_trans = 0;
|
|
|
|
/* Always begin writing backup roots after the one being used */
|
|
if (backup_index < 0) {
|
|
fs_info->backup_root_index = 0;
|
|
} else {
|
|
fs_info->backup_root_index = backup_index + 1;
|
|
fs_info->backup_root_index %= BTRFS_NUM_BACKUP_ROOTS;
|
|
}
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
void btrfs_init_fs_info(struct btrfs_fs_info *fs_info)
|
|
{
|
|
INIT_RADIX_TREE(&fs_info->fs_roots_radix, GFP_ATOMIC);
|
|
INIT_RADIX_TREE(&fs_info->buffer_radix, GFP_ATOMIC);
|
|
INIT_LIST_HEAD(&fs_info->trans_list);
|
|
INIT_LIST_HEAD(&fs_info->dead_roots);
|
|
INIT_LIST_HEAD(&fs_info->delayed_iputs);
|
|
INIT_LIST_HEAD(&fs_info->delalloc_roots);
|
|
INIT_LIST_HEAD(&fs_info->caching_block_groups);
|
|
spin_lock_init(&fs_info->delalloc_root_lock);
|
|
spin_lock_init(&fs_info->trans_lock);
|
|
spin_lock_init(&fs_info->fs_roots_radix_lock);
|
|
spin_lock_init(&fs_info->delayed_iput_lock);
|
|
spin_lock_init(&fs_info->defrag_inodes_lock);
|
|
spin_lock_init(&fs_info->super_lock);
|
|
spin_lock_init(&fs_info->buffer_lock);
|
|
spin_lock_init(&fs_info->unused_bgs_lock);
|
|
spin_lock_init(&fs_info->treelog_bg_lock);
|
|
spin_lock_init(&fs_info->zone_active_bgs_lock);
|
|
spin_lock_init(&fs_info->relocation_bg_lock);
|
|
rwlock_init(&fs_info->tree_mod_log_lock);
|
|
rwlock_init(&fs_info->global_root_lock);
|
|
mutex_init(&fs_info->unused_bg_unpin_mutex);
|
|
mutex_init(&fs_info->reclaim_bgs_lock);
|
|
mutex_init(&fs_info->reloc_mutex);
|
|
mutex_init(&fs_info->delalloc_root_mutex);
|
|
mutex_init(&fs_info->zoned_meta_io_lock);
|
|
seqlock_init(&fs_info->profiles_lock);
|
|
|
|
INIT_LIST_HEAD(&fs_info->dirty_cowonly_roots);
|
|
INIT_LIST_HEAD(&fs_info->space_info);
|
|
INIT_LIST_HEAD(&fs_info->tree_mod_seq_list);
|
|
INIT_LIST_HEAD(&fs_info->unused_bgs);
|
|
INIT_LIST_HEAD(&fs_info->reclaim_bgs);
|
|
INIT_LIST_HEAD(&fs_info->zone_active_bgs);
|
|
#ifdef CONFIG_BTRFS_DEBUG
|
|
INIT_LIST_HEAD(&fs_info->allocated_roots);
|
|
INIT_LIST_HEAD(&fs_info->allocated_ebs);
|
|
spin_lock_init(&fs_info->eb_leak_lock);
|
|
#endif
|
|
extent_map_tree_init(&fs_info->mapping_tree);
|
|
btrfs_init_block_rsv(&fs_info->global_block_rsv,
|
|
BTRFS_BLOCK_RSV_GLOBAL);
|
|
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);
|
|
btrfs_init_block_rsv(&fs_info->delayed_refs_rsv,
|
|
BTRFS_BLOCK_RSV_DELREFS);
|
|
|
|
atomic_set(&fs_info->async_delalloc_pages, 0);
|
|
atomic_set(&fs_info->defrag_running, 0);
|
|
atomic_set(&fs_info->nr_delayed_iputs, 0);
|
|
atomic64_set(&fs_info->tree_mod_seq, 0);
|
|
fs_info->global_root_tree = RB_ROOT;
|
|
fs_info->max_inline = BTRFS_DEFAULT_MAX_INLINE;
|
|
fs_info->metadata_ratio = 0;
|
|
fs_info->defrag_inodes = RB_ROOT;
|
|
atomic64_set(&fs_info->free_chunk_space, 0);
|
|
fs_info->tree_mod_log = RB_ROOT;
|
|
fs_info->commit_interval = BTRFS_DEFAULT_COMMIT_INTERVAL;
|
|
fs_info->avg_delayed_ref_runtime = NSEC_PER_SEC >> 6; /* div by 64 */
|
|
btrfs_init_ref_verify(fs_info);
|
|
|
|
fs_info->thread_pool_size = min_t(unsigned long,
|
|
num_online_cpus() + 2, 8);
|
|
|
|
INIT_LIST_HEAD(&fs_info->ordered_roots);
|
|
spin_lock_init(&fs_info->ordered_root_lock);
|
|
|
|
btrfs_init_scrub(fs_info);
|
|
#ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
|
|
fs_info->check_integrity_print_mask = 0;
|
|
#endif
|
|
btrfs_init_balance(fs_info);
|
|
btrfs_init_async_reclaim_work(fs_info);
|
|
|
|
spin_lock_init(&fs_info->block_group_cache_lock);
|
|
fs_info->block_group_cache_tree = RB_ROOT;
|
|
fs_info->first_logical_byte = (u64)-1;
|
|
|
|
extent_io_tree_init(fs_info, &fs_info->excluded_extents,
|
|
IO_TREE_FS_EXCLUDED_EXTENTS, NULL);
|
|
|
|
mutex_init(&fs_info->ordered_operations_mutex);
|
|
mutex_init(&fs_info->tree_log_mutex);
|
|
mutex_init(&fs_info->chunk_mutex);
|
|
mutex_init(&fs_info->transaction_kthread_mutex);
|
|
mutex_init(&fs_info->cleaner_mutex);
|
|
mutex_init(&fs_info->ro_block_group_mutex);
|
|
init_rwsem(&fs_info->commit_root_sem);
|
|
init_rwsem(&fs_info->cleanup_work_sem);
|
|
init_rwsem(&fs_info->subvol_sem);
|
|
sema_init(&fs_info->uuid_tree_rescan_sem, 1);
|
|
|
|
btrfs_init_dev_replace_locks(fs_info);
|
|
btrfs_init_qgroup(fs_info);
|
|
btrfs_discard_init(fs_info);
|
|
|
|
btrfs_init_free_cluster(&fs_info->meta_alloc_cluster);
|
|
btrfs_init_free_cluster(&fs_info->data_alloc_cluster);
|
|
|
|
init_waitqueue_head(&fs_info->transaction_throttle);
|
|
init_waitqueue_head(&fs_info->transaction_wait);
|
|
init_waitqueue_head(&fs_info->transaction_blocked_wait);
|
|
init_waitqueue_head(&fs_info->async_submit_wait);
|
|
init_waitqueue_head(&fs_info->delayed_iputs_wait);
|
|
|
|
/* Usable values until the real ones are cached from the superblock */
|
|
fs_info->nodesize = 4096;
|
|
fs_info->sectorsize = 4096;
|
|
fs_info->sectorsize_bits = ilog2(4096);
|
|
fs_info->stripesize = 4096;
|
|
|
|
spin_lock_init(&fs_info->swapfile_pins_lock);
|
|
fs_info->swapfile_pins = RB_ROOT;
|
|
|
|
fs_info->bg_reclaim_threshold = BTRFS_DEFAULT_RECLAIM_THRESH;
|
|
INIT_WORK(&fs_info->reclaim_bgs_work, btrfs_reclaim_bgs_work);
|
|
}
|
|
|
|
static int init_mount_fs_info(struct btrfs_fs_info *fs_info, struct super_block *sb)
|
|
{
|
|
int ret;
|
|
|
|
fs_info->sb = sb;
|
|
sb->s_blocksize = BTRFS_BDEV_BLOCKSIZE;
|
|
sb->s_blocksize_bits = blksize_bits(BTRFS_BDEV_BLOCKSIZE);
|
|
|
|
ret = percpu_counter_init(&fs_info->ordered_bytes, 0, GFP_KERNEL);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = percpu_counter_init(&fs_info->dirty_metadata_bytes, 0, GFP_KERNEL);
|
|
if (ret)
|
|
return ret;
|
|
|
|
fs_info->dirty_metadata_batch = PAGE_SIZE *
|
|
(1 + ilog2(nr_cpu_ids));
|
|
|
|
ret = percpu_counter_init(&fs_info->delalloc_bytes, 0, GFP_KERNEL);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = percpu_counter_init(&fs_info->dev_replace.bio_counter, 0,
|
|
GFP_KERNEL);
|
|
if (ret)
|
|
return ret;
|
|
|
|
fs_info->delayed_root = kmalloc(sizeof(struct btrfs_delayed_root),
|
|
GFP_KERNEL);
|
|
if (!fs_info->delayed_root)
|
|
return -ENOMEM;
|
|
btrfs_init_delayed_root(fs_info->delayed_root);
|
|
|
|
if (sb_rdonly(sb))
|
|
set_bit(BTRFS_FS_STATE_RO, &fs_info->fs_state);
|
|
|
|
return btrfs_alloc_stripe_hash_table(fs_info);
|
|
}
|
|
|
|
static int btrfs_uuid_rescan_kthread(void *data)
|
|
{
|
|
struct btrfs_fs_info *fs_info = (struct btrfs_fs_info *)data;
|
|
int ret;
|
|
|
|
/*
|
|
* 1st step is to iterate through the existing UUID tree and
|
|
* to delete all entries that contain outdated data.
|
|
* 2nd step is to add all missing entries to the UUID tree.
|
|
*/
|
|
ret = btrfs_uuid_tree_iterate(fs_info);
|
|
if (ret < 0) {
|
|
if (ret != -EINTR)
|
|
btrfs_warn(fs_info, "iterating uuid_tree failed %d",
|
|
ret);
|
|
up(&fs_info->uuid_tree_rescan_sem);
|
|
return ret;
|
|
}
|
|
return btrfs_uuid_scan_kthread(data);
|
|
}
|
|
|
|
static int btrfs_check_uuid_tree(struct btrfs_fs_info *fs_info)
|
|
{
|
|
struct task_struct *task;
|
|
|
|
down(&fs_info->uuid_tree_rescan_sem);
|
|
task = kthread_run(btrfs_uuid_rescan_kthread, fs_info, "btrfs-uuid");
|
|
if (IS_ERR(task)) {
|
|
/* fs_info->update_uuid_tree_gen remains 0 in all error case */
|
|
btrfs_warn(fs_info, "failed to start uuid_rescan task");
|
|
up(&fs_info->uuid_tree_rescan_sem);
|
|
return PTR_ERR(task);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Some options only have meaning at mount time and shouldn't persist across
|
|
* remounts, or be displayed. Clear these at the end of mount and remount
|
|
* code paths.
|
|
*/
|
|
void btrfs_clear_oneshot_options(struct btrfs_fs_info *fs_info)
|
|
{
|
|
btrfs_clear_opt(fs_info->mount_opt, USEBACKUPROOT);
|
|
btrfs_clear_opt(fs_info->mount_opt, CLEAR_CACHE);
|
|
}
|
|
|
|
/*
|
|
* Mounting logic specific to read-write file systems. Shared by open_ctree
|
|
* and btrfs_remount when remounting from read-only to read-write.
|
|
*/
|
|
int btrfs_start_pre_rw_mount(struct btrfs_fs_info *fs_info)
|
|
{
|
|
int ret;
|
|
const bool cache_opt = btrfs_test_opt(fs_info, SPACE_CACHE);
|
|
bool clear_free_space_tree = false;
|
|
|
|
if (btrfs_test_opt(fs_info, CLEAR_CACHE) &&
|
|
btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE)) {
|
|
clear_free_space_tree = true;
|
|
} else if (btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE) &&
|
|
!btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE_VALID)) {
|
|
btrfs_warn(fs_info, "free space tree is invalid");
|
|
clear_free_space_tree = true;
|
|
}
|
|
|
|
if (clear_free_space_tree) {
|
|
btrfs_info(fs_info, "clearing free space tree");
|
|
ret = btrfs_clear_free_space_tree(fs_info);
|
|
if (ret) {
|
|
btrfs_warn(fs_info,
|
|
"failed to clear free space tree: %d", ret);
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* btrfs_find_orphan_roots() is responsible for finding all the dead
|
|
* roots (with 0 refs), flag them with BTRFS_ROOT_DEAD_TREE and load
|
|
* them into the fs_info->fs_roots_radix tree. This must be done before
|
|
* calling btrfs_orphan_cleanup() on the tree root. If we don't do it
|
|
* first, then btrfs_orphan_cleanup() will delete a dead root's orphan
|
|
* item before the root's tree is deleted - this means that if we unmount
|
|
* or crash before the deletion completes, on the next mount we will not
|
|
* delete what remains of the tree because the orphan item does not
|
|
* exists anymore, which is what tells us we have a pending deletion.
|
|
*/
|
|
ret = btrfs_find_orphan_roots(fs_info);
|
|
if (ret)
|
|
goto out;
|
|
|
|
ret = btrfs_cleanup_fs_roots(fs_info);
|
|
if (ret)
|
|
goto out;
|
|
|
|
down_read(&fs_info->cleanup_work_sem);
|
|
if ((ret = btrfs_orphan_cleanup(fs_info->fs_root)) ||
|
|
(ret = btrfs_orphan_cleanup(fs_info->tree_root))) {
|
|
up_read(&fs_info->cleanup_work_sem);
|
|
goto out;
|
|
}
|
|
up_read(&fs_info->cleanup_work_sem);
|
|
|
|
mutex_lock(&fs_info->cleaner_mutex);
|
|
ret = btrfs_recover_relocation(fs_info->tree_root);
|
|
mutex_unlock(&fs_info->cleaner_mutex);
|
|
if (ret < 0) {
|
|
btrfs_warn(fs_info, "failed to recover relocation: %d", ret);
|
|
goto out;
|
|
}
|
|
|
|
if (btrfs_test_opt(fs_info, FREE_SPACE_TREE) &&
|
|
!btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE)) {
|
|
btrfs_info(fs_info, "creating free space tree");
|
|
ret = btrfs_create_free_space_tree(fs_info);
|
|
if (ret) {
|
|
btrfs_warn(fs_info,
|
|
"failed to create free space tree: %d", ret);
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
if (cache_opt != btrfs_free_space_cache_v1_active(fs_info)) {
|
|
ret = btrfs_set_free_space_cache_v1_active(fs_info, cache_opt);
|
|
if (ret)
|
|
goto out;
|
|
}
|
|
|
|
ret = btrfs_resume_balance_async(fs_info);
|
|
if (ret)
|
|
goto out;
|
|
|
|
ret = btrfs_resume_dev_replace_async(fs_info);
|
|
if (ret) {
|
|
btrfs_warn(fs_info, "failed to resume dev_replace");
|
|
goto out;
|
|
}
|
|
|
|
btrfs_qgroup_rescan_resume(fs_info);
|
|
|
|
if (!fs_info->uuid_root) {
|
|
btrfs_info(fs_info, "creating UUID tree");
|
|
ret = btrfs_create_uuid_tree(fs_info);
|
|
if (ret) {
|
|
btrfs_warn(fs_info,
|
|
"failed to create the UUID tree %d", ret);
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
int __cold open_ctree(struct super_block *sb, struct btrfs_fs_devices *fs_devices,
|
|
char *options)
|
|
{
|
|
u32 sectorsize;
|
|
u32 nodesize;
|
|
u32 stripesize;
|
|
u64 generation;
|
|
u64 features;
|
|
u16 csum_type;
|
|
struct btrfs_super_block *disk_super;
|
|
struct btrfs_fs_info *fs_info = btrfs_sb(sb);
|
|
struct btrfs_root *tree_root;
|
|
struct btrfs_root *chunk_root;
|
|
int ret;
|
|
int err = -EINVAL;
|
|
int level;
|
|
|
|
ret = init_mount_fs_info(fs_info, sb);
|
|
if (ret) {
|
|
err = ret;
|
|
goto fail;
|
|
}
|
|
|
|
/* These need to be init'ed before we start creating inodes and such. */
|
|
tree_root = btrfs_alloc_root(fs_info, BTRFS_ROOT_TREE_OBJECTID,
|
|
GFP_KERNEL);
|
|
fs_info->tree_root = tree_root;
|
|
chunk_root = btrfs_alloc_root(fs_info, BTRFS_CHUNK_TREE_OBJECTID,
|
|
GFP_KERNEL);
|
|
fs_info->chunk_root = chunk_root;
|
|
if (!tree_root || !chunk_root) {
|
|
err = -ENOMEM;
|
|
goto fail;
|
|
}
|
|
|
|
fs_info->btree_inode = new_inode(sb);
|
|
if (!fs_info->btree_inode) {
|
|
err = -ENOMEM;
|
|
goto fail;
|
|
}
|
|
mapping_set_gfp_mask(fs_info->btree_inode->i_mapping, GFP_NOFS);
|
|
btrfs_init_btree_inode(fs_info);
|
|
|
|
invalidate_bdev(fs_devices->latest_dev->bdev);
|
|
|
|
/*
|
|
* Read super block and check the signature bytes only
|
|
*/
|
|
disk_super = btrfs_read_dev_super(fs_devices->latest_dev->bdev);
|
|
if (IS_ERR(disk_super)) {
|
|
err = PTR_ERR(disk_super);
|
|
goto fail_alloc;
|
|
}
|
|
|
|
/*
|
|
* Verify the type first, if that or the checksum value are
|
|
* corrupted, we'll find out
|
|
*/
|
|
csum_type = btrfs_super_csum_type(disk_super);
|
|
if (!btrfs_supported_super_csum(csum_type)) {
|
|
btrfs_err(fs_info, "unsupported checksum algorithm: %u",
|
|
csum_type);
|
|
err = -EINVAL;
|
|
btrfs_release_disk_super(disk_super);
|
|
goto fail_alloc;
|
|
}
|
|
|
|
fs_info->csum_size = btrfs_super_csum_size(disk_super);
|
|
|
|
ret = btrfs_init_csum_hash(fs_info, csum_type);
|
|
if (ret) {
|
|
err = ret;
|
|
btrfs_release_disk_super(disk_super);
|
|
goto fail_alloc;
|
|
}
|
|
|
|
/*
|
|
* 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(fs_info, (u8 *)disk_super)) {
|
|
btrfs_err(fs_info, "superblock checksum mismatch");
|
|
err = -EINVAL;
|
|
btrfs_release_disk_super(disk_super);
|
|
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
|
|
*/
|
|
memcpy(fs_info->super_copy, disk_super, sizeof(*fs_info->super_copy));
|
|
btrfs_release_disk_super(disk_super);
|
|
|
|
disk_super = fs_info->super_copy;
|
|
|
|
|
|
features = btrfs_super_flags(disk_super);
|
|
if (features & BTRFS_SUPER_FLAG_CHANGING_FSID_V2) {
|
|
features &= ~BTRFS_SUPER_FLAG_CHANGING_FSID_V2;
|
|
btrfs_set_super_flags(disk_super, features);
|
|
btrfs_info(fs_info,
|
|
"found metadata UUID change in progress flag, clearing");
|
|
}
|
|
|
|
memcpy(fs_info->super_for_commit, fs_info->super_copy,
|
|
sizeof(*fs_info->super_for_commit));
|
|
|
|
ret = btrfs_validate_mount_super(fs_info);
|
|
if (ret) {
|
|
btrfs_err(fs_info, "superblock contains fatal errors");
|
|
err = -EINVAL;
|
|
goto fail_alloc;
|
|
}
|
|
|
|
if (!btrfs_super_root(disk_super))
|
|
goto fail_alloc;
|
|
|
|
/* check FS state, whether FS is broken. */
|
|
if (btrfs_super_flags(disk_super) & BTRFS_SUPER_FLAG_ERROR)
|
|
set_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state);
|
|
|
|
/*
|
|
* 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;
|
|
|
|
/*
|
|
* Flag our filesystem as having big metadata blocks if they are bigger
|
|
* than the page size.
|
|
*/
|
|
if (btrfs_super_nodesize(disk_super) > PAGE_SIZE) {
|
|
if (!(features & BTRFS_FEATURE_INCOMPAT_BIG_METADATA))
|
|
btrfs_info(fs_info,
|
|
"flagging fs with big metadata feature");
|
|
features |= BTRFS_FEATURE_INCOMPAT_BIG_METADATA;
|
|
}
|
|
|
|
/* Set up fs_info before parsing mount options */
|
|
nodesize = btrfs_super_nodesize(disk_super);
|
|
sectorsize = btrfs_super_sectorsize(disk_super);
|
|
stripesize = sectorsize;
|
|
fs_info->dirty_metadata_batch = nodesize * (1 + ilog2(nr_cpu_ids));
|
|
fs_info->delalloc_batch = sectorsize * 512 * (1 + ilog2(nr_cpu_ids));
|
|
|
|
fs_info->nodesize = nodesize;
|
|
fs_info->sectorsize = sectorsize;
|
|
fs_info->sectorsize_bits = ilog2(sectorsize);
|
|
fs_info->csums_per_leaf = BTRFS_MAX_ITEM_SIZE(fs_info) / fs_info->csum_size;
|
|
fs_info->stripesize = stripesize;
|
|
|
|
ret = btrfs_parse_options(fs_info, options, sb->s_flags);
|
|
if (ret) {
|
|
err = ret;
|
|
goto fail_alloc;
|
|
}
|
|
|
|
features = btrfs_super_incompat_flags(disk_super) &
|
|
~BTRFS_FEATURE_INCOMPAT_SUPP;
|
|
if (features) {
|
|
btrfs_err(fs_info,
|
|
"cannot mount because of unsupported optional features (%llx)",
|
|
features);
|
|
err = -EINVAL;
|
|
goto fail_alloc;
|
|
}
|
|
|
|
features = btrfs_super_incompat_flags(disk_super);
|
|
features |= BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF;
|
|
if (fs_info->compress_type == BTRFS_COMPRESS_LZO)
|
|
features |= BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO;
|
|
else if (fs_info->compress_type == BTRFS_COMPRESS_ZSTD)
|
|
features |= BTRFS_FEATURE_INCOMPAT_COMPRESS_ZSTD;
|
|
|
|
if (features & BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA)
|
|
btrfs_info(fs_info, "has skinny extents");
|
|
|
|
/*
|
|
* 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) &&
|
|
(sectorsize != nodesize)) {
|
|
btrfs_err(fs_info,
|
|
"unequal nodesize/sectorsize (%u != %u) are not allowed for mixed block groups",
|
|
nodesize, sectorsize);
|
|
goto fail_alloc;
|
|
}
|
|
|
|
/*
|
|
* Needn't use the lock because there is no other task which will
|
|
* update the flag.
|
|
*/
|
|
btrfs_set_super_incompat_flags(disk_super, features);
|
|
|
|
features = btrfs_super_compat_ro_flags(disk_super) &
|
|
~BTRFS_FEATURE_COMPAT_RO_SUPP;
|
|
if (!sb_rdonly(sb) && features) {
|
|
btrfs_err(fs_info,
|
|
"cannot mount read-write because of unsupported optional features (%llx)",
|
|
features);
|
|
err = -EINVAL;
|
|
goto fail_alloc;
|
|
}
|
|
|
|
if (sectorsize < PAGE_SIZE) {
|
|
struct btrfs_subpage_info *subpage_info;
|
|
|
|
btrfs_warn(fs_info,
|
|
"read-write for sector size %u with page size %lu is experimental",
|
|
sectorsize, PAGE_SIZE);
|
|
if (btrfs_super_incompat_flags(fs_info->super_copy) &
|
|
BTRFS_FEATURE_INCOMPAT_RAID56) {
|
|
btrfs_err(fs_info,
|
|
"RAID56 is not yet supported for sector size %u with page size %lu",
|
|
sectorsize, PAGE_SIZE);
|
|
err = -EINVAL;
|
|
goto fail_alloc;
|
|
}
|
|
subpage_info = kzalloc(sizeof(*subpage_info), GFP_KERNEL);
|
|
if (!subpage_info)
|
|
goto fail_alloc;
|
|
btrfs_init_subpage_info(subpage_info, sectorsize);
|
|
fs_info->subpage_info = subpage_info;
|
|
}
|
|
|
|
ret = btrfs_init_workqueues(fs_info);
|
|
if (ret) {
|
|
err = ret;
|
|
goto fail_sb_buffer;
|
|
}
|
|
|
|
sb->s_bdi->ra_pages *= btrfs_super_num_devices(disk_super);
|
|
sb->s_bdi->ra_pages = max(sb->s_bdi->ra_pages, SZ_4M / PAGE_SIZE);
|
|
|
|
sb->s_blocksize = sectorsize;
|
|
sb->s_blocksize_bits = blksize_bits(sectorsize);
|
|
memcpy(&sb->s_uuid, fs_info->fs_devices->fsid, BTRFS_FSID_SIZE);
|
|
|
|
mutex_lock(&fs_info->chunk_mutex);
|
|
ret = btrfs_read_sys_array(fs_info);
|
|
mutex_unlock(&fs_info->chunk_mutex);
|
|
if (ret) {
|
|
btrfs_err(fs_info, "failed to read the system array: %d", ret);
|
|
goto fail_sb_buffer;
|
|
}
|
|
|
|
generation = btrfs_super_chunk_root_generation(disk_super);
|
|
level = btrfs_super_chunk_root_level(disk_super);
|
|
|
|
chunk_root->node = read_tree_block(fs_info,
|
|
btrfs_super_chunk_root(disk_super),
|
|
BTRFS_CHUNK_TREE_OBJECTID,
|
|
generation, level, NULL);
|
|
if (IS_ERR(chunk_root->node) ||
|
|
!extent_buffer_uptodate(chunk_root->node)) {
|
|
btrfs_err(fs_info, "failed to read chunk root");
|
|
if (!IS_ERR(chunk_root->node))
|
|
free_extent_buffer(chunk_root->node);
|
|
chunk_root->node = NULL;
|
|
goto fail_tree_roots;
|
|
}
|
|
btrfs_set_root_node(&chunk_root->root_item, chunk_root->node);
|
|
chunk_root->commit_root = btrfs_root_node(chunk_root);
|
|
|
|
read_extent_buffer(chunk_root->node, fs_info->chunk_tree_uuid,
|
|
offsetof(struct btrfs_header, chunk_tree_uuid),
|
|
BTRFS_UUID_SIZE);
|
|
|
|
ret = btrfs_read_chunk_tree(fs_info);
|
|
if (ret) {
|
|
btrfs_err(fs_info, "failed to read chunk tree: %d", ret);
|
|
goto fail_tree_roots;
|
|
}
|
|
|
|
/*
|
|
* At this point we know all the devices that make this filesystem,
|
|
* including the seed devices but we don't know yet if the replace
|
|
* target is required. So free devices that are not part of this
|
|
* filesystem but skip the replace target device which is checked
|
|
* below in btrfs_init_dev_replace().
|
|
*/
|
|
btrfs_free_extra_devids(fs_devices);
|
|
if (!fs_devices->latest_dev->bdev) {
|
|
btrfs_err(fs_info, "failed to read devices");
|
|
goto fail_tree_roots;
|
|
}
|
|
|
|
ret = init_tree_roots(fs_info);
|
|
if (ret)
|
|
goto fail_tree_roots;
|
|
|
|
/*
|
|
* Get zone type information of zoned block devices. This will also
|
|
* handle emulation of a zoned filesystem if a regular device has the
|
|
* zoned incompat feature flag set.
|
|
*/
|
|
ret = btrfs_get_dev_zone_info_all_devices(fs_info);
|
|
if (ret) {
|
|
btrfs_err(fs_info,
|
|
"zoned: failed to read device zone info: %d",
|
|
ret);
|
|
goto fail_block_groups;
|
|
}
|
|
|
|
/*
|
|
* If we have a uuid root and we're not being told to rescan we need to
|
|
* check the generation here so we can set the
|
|
* BTRFS_FS_UPDATE_UUID_TREE_GEN bit. Otherwise we could commit the
|
|
* transaction during a balance or the log replay without updating the
|
|
* uuid generation, and then if we crash we would rescan the uuid tree,
|
|
* even though it was perfectly fine.
|
|
*/
|
|
if (fs_info->uuid_root && !btrfs_test_opt(fs_info, RESCAN_UUID_TREE) &&
|
|
fs_info->generation == btrfs_super_uuid_tree_generation(disk_super))
|
|
set_bit(BTRFS_FS_UPDATE_UUID_TREE_GEN, &fs_info->flags);
|
|
|
|
ret = btrfs_verify_dev_extents(fs_info);
|
|
if (ret) {
|
|
btrfs_err(fs_info,
|
|
"failed to verify dev extents against chunks: %d",
|
|
ret);
|
|
goto fail_block_groups;
|
|
}
|
|
ret = btrfs_recover_balance(fs_info);
|
|
if (ret) {
|
|
btrfs_err(fs_info, "failed to recover balance: %d", ret);
|
|
goto fail_block_groups;
|
|
}
|
|
|
|
ret = btrfs_init_dev_stats(fs_info);
|
|
if (ret) {
|
|
btrfs_err(fs_info, "failed to init dev_stats: %d", ret);
|
|
goto fail_block_groups;
|
|
}
|
|
|
|
ret = btrfs_init_dev_replace(fs_info);
|
|
if (ret) {
|
|
btrfs_err(fs_info, "failed to init dev_replace: %d", ret);
|
|
goto fail_block_groups;
|
|
}
|
|
|
|
ret = btrfs_check_zoned_mode(fs_info);
|
|
if (ret) {
|
|
btrfs_err(fs_info, "failed to initialize zoned mode: %d",
|
|
ret);
|
|
goto fail_block_groups;
|
|
}
|
|
|
|
ret = btrfs_sysfs_add_fsid(fs_devices);
|
|
if (ret) {
|
|
btrfs_err(fs_info, "failed to init sysfs fsid interface: %d",
|
|
ret);
|
|
goto fail_block_groups;
|
|
}
|
|
|
|
ret = btrfs_sysfs_add_mounted(fs_info);
|
|
if (ret) {
|
|
btrfs_err(fs_info, "failed to init sysfs interface: %d", ret);
|
|
goto fail_fsdev_sysfs;
|
|
}
|
|
|
|
ret = btrfs_init_space_info(fs_info);
|
|
if (ret) {
|
|
btrfs_err(fs_info, "failed to initialize space info: %d", ret);
|
|
goto fail_sysfs;
|
|
}
|
|
|
|
ret = btrfs_read_block_groups(fs_info);
|
|
if (ret) {
|
|
btrfs_err(fs_info, "failed to read block groups: %d", ret);
|
|
goto fail_sysfs;
|
|
}
|
|
|
|
btrfs_free_zone_cache(fs_info);
|
|
|
|
if (!sb_rdonly(sb) && fs_info->fs_devices->missing_devices &&
|
|
!btrfs_check_rw_degradable(fs_info, NULL)) {
|
|
btrfs_warn(fs_info,
|
|
"writable mount is not allowed due to too many missing devices");
|
|
goto fail_sysfs;
|
|
}
|
|
|
|
fs_info->cleaner_kthread = kthread_run(cleaner_kthread, tree_root,
|
|
"btrfs-cleaner");
|
|
if (IS_ERR(fs_info->cleaner_kthread))
|
|
goto fail_sysfs;
|
|
|
|
fs_info->transaction_kthread = kthread_run(transaction_kthread,
|
|
tree_root,
|
|
"btrfs-transaction");
|
|
if (IS_ERR(fs_info->transaction_kthread))
|
|
goto fail_cleaner;
|
|
|
|
if (!btrfs_test_opt(fs_info, NOSSD) &&
|
|
!fs_info->fs_devices->rotating) {
|
|
btrfs_set_and_info(fs_info, SSD, "enabling ssd optimizations");
|
|
}
|
|
|
|
/*
|
|
* Mount does not set all options immediately, we can do it now and do
|
|
* not have to wait for transaction commit
|
|
*/
|
|
btrfs_apply_pending_changes(fs_info);
|
|
|
|
#ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
|
|
if (btrfs_test_opt(fs_info, CHECK_INTEGRITY)) {
|
|
ret = btrfsic_mount(fs_info, fs_devices,
|
|
btrfs_test_opt(fs_info,
|
|
CHECK_INTEGRITY_DATA) ? 1 : 0,
|
|
fs_info->check_integrity_print_mask);
|
|
if (ret)
|
|
btrfs_warn(fs_info,
|
|
"failed to initialize integrity check module: %d",
|
|
ret);
|
|
}
|
|
#endif
|
|
ret = btrfs_read_qgroup_config(fs_info);
|
|
if (ret)
|
|
goto fail_trans_kthread;
|
|
|
|
if (btrfs_build_ref_tree(fs_info))
|
|
btrfs_err(fs_info, "couldn't build ref tree");
|
|
|
|
/* do not make disk changes in broken FS or nologreplay is given */
|
|
if (btrfs_super_log_root(disk_super) != 0 &&
|
|
!btrfs_test_opt(fs_info, NOLOGREPLAY)) {
|
|
btrfs_info(fs_info, "start tree-log replay");
|
|
ret = btrfs_replay_log(fs_info, fs_devices);
|
|
if (ret) {
|
|
err = ret;
|
|
goto fail_qgroup;
|
|
}
|
|
}
|
|
|
|
fs_info->fs_root = btrfs_get_fs_root(fs_info, BTRFS_FS_TREE_OBJECTID, true);
|
|
if (IS_ERR(fs_info->fs_root)) {
|
|
err = PTR_ERR(fs_info->fs_root);
|
|
btrfs_warn(fs_info, "failed to read fs tree: %d", err);
|
|
fs_info->fs_root = NULL;
|
|
goto fail_qgroup;
|
|
}
|
|
|
|
if (sb_rdonly(sb))
|
|
goto clear_oneshot;
|
|
|
|
ret = btrfs_start_pre_rw_mount(fs_info);
|
|
if (ret) {
|
|
close_ctree(fs_info);
|
|
return ret;
|
|
}
|
|
btrfs_discard_resume(fs_info);
|
|
|
|
if (fs_info->uuid_root &&
|
|
(btrfs_test_opt(fs_info, RESCAN_UUID_TREE) ||
|
|
fs_info->generation != btrfs_super_uuid_tree_generation(disk_super))) {
|
|
btrfs_info(fs_info, "checking UUID tree");
|
|
ret = btrfs_check_uuid_tree(fs_info);
|
|
if (ret) {
|
|
btrfs_warn(fs_info,
|
|
"failed to check the UUID tree: %d", ret);
|
|
close_ctree(fs_info);
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
set_bit(BTRFS_FS_OPEN, &fs_info->flags);
|
|
|
|
clear_oneshot:
|
|
btrfs_clear_oneshot_options(fs_info);
|
|
return 0;
|
|
|
|
fail_qgroup:
|
|
btrfs_free_qgroup_config(fs_info);
|
|
fail_trans_kthread:
|
|
kthread_stop(fs_info->transaction_kthread);
|
|
btrfs_cleanup_transaction(fs_info);
|
|
btrfs_free_fs_roots(fs_info);
|
|
fail_cleaner:
|
|
kthread_stop(fs_info->cleaner_kthread);
|
|
|
|
/*
|
|
* make sure we're done with the btree inode before we stop our
|
|
* kthreads
|
|
*/
|
|
filemap_write_and_wait(fs_info->btree_inode->i_mapping);
|
|
|
|
fail_sysfs:
|
|
btrfs_sysfs_remove_mounted(fs_info);
|
|
|
|
fail_fsdev_sysfs:
|
|
btrfs_sysfs_remove_fsid(fs_info->fs_devices);
|
|
|
|
fail_block_groups:
|
|
btrfs_put_block_group_cache(fs_info);
|
|
|
|
fail_tree_roots:
|
|
if (fs_info->data_reloc_root)
|
|
btrfs_drop_and_free_fs_root(fs_info, fs_info->data_reloc_root);
|
|
free_root_pointers(fs_info, true);
|
|
invalidate_inode_pages2(fs_info->btree_inode->i_mapping);
|
|
|
|
fail_sb_buffer:
|
|
btrfs_stop_all_workers(fs_info);
|
|
btrfs_free_block_groups(fs_info);
|
|
fail_alloc:
|
|
btrfs_mapping_tree_free(&fs_info->mapping_tree);
|
|
|
|
iput(fs_info->btree_inode);
|
|
fail:
|
|
btrfs_close_devices(fs_info->fs_devices);
|
|
return err;
|
|
}
|
|
ALLOW_ERROR_INJECTION(open_ctree, ERRNO);
|
|
|
|
static void btrfs_end_super_write(struct bio *bio)
|
|
{
|
|
struct btrfs_device *device = bio->bi_private;
|
|
struct bio_vec *bvec;
|
|
struct bvec_iter_all iter_all;
|
|
struct page *page;
|
|
|
|
bio_for_each_segment_all(bvec, bio, iter_all) {
|
|
page = bvec->bv_page;
|
|
|
|
if (bio->bi_status) {
|
|
btrfs_warn_rl_in_rcu(device->fs_info,
|
|
"lost page write due to IO error on %s (%d)",
|
|
rcu_str_deref(device->name),
|
|
blk_status_to_errno(bio->bi_status));
|
|
ClearPageUptodate(page);
|
|
SetPageError(page);
|
|
btrfs_dev_stat_inc_and_print(device,
|
|
BTRFS_DEV_STAT_WRITE_ERRS);
|
|
} else {
|
|
SetPageUptodate(page);
|
|
}
|
|
|
|
put_page(page);
|
|
unlock_page(page);
|
|
}
|
|
|
|
bio_put(bio);
|
|
}
|
|
|
|
struct btrfs_super_block *btrfs_read_dev_one_super(struct block_device *bdev,
|
|
int copy_num)
|
|
{
|
|
struct btrfs_super_block *super;
|
|
struct page *page;
|
|
u64 bytenr, bytenr_orig;
|
|
struct address_space *mapping = bdev->bd_inode->i_mapping;
|
|
int ret;
|
|
|
|
bytenr_orig = btrfs_sb_offset(copy_num);
|
|
ret = btrfs_sb_log_location_bdev(bdev, copy_num, READ, &bytenr);
|
|
if (ret == -ENOENT)
|
|
return ERR_PTR(-EINVAL);
|
|
else if (ret)
|
|
return ERR_PTR(ret);
|
|
|
|
if (bytenr + BTRFS_SUPER_INFO_SIZE >= bdev_nr_bytes(bdev))
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
page = read_cache_page_gfp(mapping, bytenr >> PAGE_SHIFT, GFP_NOFS);
|
|
if (IS_ERR(page))
|
|
return ERR_CAST(page);
|
|
|
|
super = page_address(page);
|
|
if (btrfs_super_magic(super) != BTRFS_MAGIC) {
|
|
btrfs_release_disk_super(super);
|
|
return ERR_PTR(-ENODATA);
|
|
}
|
|
|
|
if (btrfs_super_bytenr(super) != bytenr_orig) {
|
|
btrfs_release_disk_super(super);
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
|
|
return super;
|
|
}
|
|
|
|
|
|
struct btrfs_super_block *btrfs_read_dev_super(struct block_device *bdev)
|
|
{
|
|
struct btrfs_super_block *super, *latest = NULL;
|
|
int i;
|
|
u64 transid = 0;
|
|
|
|
/* 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++) {
|
|
super = btrfs_read_dev_one_super(bdev, i);
|
|
if (IS_ERR(super))
|
|
continue;
|
|
|
|
if (!latest || btrfs_super_generation(super) > transid) {
|
|
if (latest)
|
|
btrfs_release_disk_super(super);
|
|
|
|
latest = super;
|
|
transid = btrfs_super_generation(super);
|
|
}
|
|
}
|
|
|
|
return super;
|
|
}
|
|
|
|
/*
|
|
* Write superblock @sb to the @device. Do not wait for completion, all the
|
|
* pages we use for writing are locked.
|
|
*
|
|
* Write @max_mirrors copies of the superblock, where 0 means default that fit
|
|
* the expected device size at commit time. Note that max_mirrors must be
|
|
* same for write and wait phases.
|
|
*
|
|
* Return number of errors when page is not found or submission fails.
|
|
*/
|
|
static int write_dev_supers(struct btrfs_device *device,
|
|
struct btrfs_super_block *sb, int max_mirrors)
|
|
{
|
|
struct btrfs_fs_info *fs_info = device->fs_info;
|
|
struct address_space *mapping = device->bdev->bd_inode->i_mapping;
|
|
SHASH_DESC_ON_STACK(shash, fs_info->csum_shash);
|
|
int i;
|
|
int errors = 0;
|
|
int ret;
|
|
u64 bytenr, bytenr_orig;
|
|
|
|
if (max_mirrors == 0)
|
|
max_mirrors = BTRFS_SUPER_MIRROR_MAX;
|
|
|
|
shash->tfm = fs_info->csum_shash;
|
|
|
|
for (i = 0; i < max_mirrors; i++) {
|
|
struct page *page;
|
|
struct bio *bio;
|
|
struct btrfs_super_block *disk_super;
|
|
|
|
bytenr_orig = btrfs_sb_offset(i);
|
|
ret = btrfs_sb_log_location(device, i, WRITE, &bytenr);
|
|
if (ret == -ENOENT) {
|
|
continue;
|
|
} else if (ret < 0) {
|
|
btrfs_err(device->fs_info,
|
|
"couldn't get super block location for mirror %d",
|
|
i);
|
|
errors++;
|
|
continue;
|
|
}
|
|
if (bytenr + BTRFS_SUPER_INFO_SIZE >=
|
|
device->commit_total_bytes)
|
|
break;
|
|
|
|
btrfs_set_super_bytenr(sb, bytenr_orig);
|
|
|
|
crypto_shash_digest(shash, (const char *)sb + BTRFS_CSUM_SIZE,
|
|
BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE,
|
|
sb->csum);
|
|
|
|
page = find_or_create_page(mapping, bytenr >> PAGE_SHIFT,
|
|
GFP_NOFS);
|
|
if (!page) {
|
|
btrfs_err(device->fs_info,
|
|
"couldn't get super block page for bytenr %llu",
|
|
bytenr);
|
|
errors++;
|
|
continue;
|
|
}
|
|
|
|
/* Bump the refcount for wait_dev_supers() */
|
|
get_page(page);
|
|
|
|
disk_super = page_address(page);
|
|
memcpy(disk_super, sb, BTRFS_SUPER_INFO_SIZE);
|
|
|
|
/*
|
|
* Directly use bios here instead of relying on the page cache
|
|
* to do I/O, so we don't lose the ability to do integrity
|
|
* checking.
|
|
*/
|
|
bio = bio_alloc(GFP_NOFS, 1);
|
|
bio_set_dev(bio, device->bdev);
|
|
bio->bi_iter.bi_sector = bytenr >> SECTOR_SHIFT;
|
|
bio->bi_private = device;
|
|
bio->bi_end_io = btrfs_end_super_write;
|
|
__bio_add_page(bio, page, BTRFS_SUPER_INFO_SIZE,
|
|
offset_in_page(bytenr));
|
|
|
|
/*
|
|
* We FUA only the first super block. The others we allow to
|
|
* go down lazy and there's a short window where the on-disk
|
|
* copies might still contain the older version.
|
|
*/
|
|
bio->bi_opf = REQ_OP_WRITE | REQ_SYNC | REQ_META | REQ_PRIO;
|
|
if (i == 0 && !btrfs_test_opt(device->fs_info, NOBARRIER))
|
|
bio->bi_opf |= REQ_FUA;
|
|
|
|
btrfsic_submit_bio(bio);
|
|
|
|
if (btrfs_advance_sb_log(device, i))
|
|
errors++;
|
|
}
|
|
return errors < i ? 0 : -1;
|
|
}
|
|
|
|
/*
|
|
* Wait for write completion of superblocks done by write_dev_supers,
|
|
* @max_mirrors same for write and wait phases.
|
|
*
|
|
* Return number of errors when page is not found or not marked up to
|
|
* date.
|
|
*/
|
|
static int wait_dev_supers(struct btrfs_device *device, int max_mirrors)
|
|
{
|
|
int i;
|
|
int errors = 0;
|
|
bool primary_failed = false;
|
|
int ret;
|
|
u64 bytenr;
|
|
|
|
if (max_mirrors == 0)
|
|
max_mirrors = BTRFS_SUPER_MIRROR_MAX;
|
|
|
|
for (i = 0; i < max_mirrors; i++) {
|
|
struct page *page;
|
|
|
|
ret = btrfs_sb_log_location(device, i, READ, &bytenr);
|
|
if (ret == -ENOENT) {
|
|
break;
|
|
} else if (ret < 0) {
|
|
errors++;
|
|
if (i == 0)
|
|
primary_failed = true;
|
|
continue;
|
|
}
|
|
if (bytenr + BTRFS_SUPER_INFO_SIZE >=
|
|
device->commit_total_bytes)
|
|
break;
|
|
|
|
page = find_get_page(device->bdev->bd_inode->i_mapping,
|
|
bytenr >> PAGE_SHIFT);
|
|
if (!page) {
|
|
errors++;
|
|
if (i == 0)
|
|
primary_failed = true;
|
|
continue;
|
|
}
|
|
/* Page is submitted locked and unlocked once the IO completes */
|
|
wait_on_page_locked(page);
|
|
if (PageError(page)) {
|
|
errors++;
|
|
if (i == 0)
|
|
primary_failed = true;
|
|
}
|
|
|
|
/* Drop our reference */
|
|
put_page(page);
|
|
|
|
/* Drop the reference from the writing run */
|
|
put_page(page);
|
|
}
|
|
|
|
/* log error, force error return */
|
|
if (primary_failed) {
|
|
btrfs_err(device->fs_info, "error writing primary super block to device %llu",
|
|
device->devid);
|
|
return -1;
|
|
}
|
|
|
|
return errors < i ? 0 : -1;
|
|
}
|
|
|
|
/*
|
|
* 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)
|
|
{
|
|
complete(bio->bi_private);
|
|
}
|
|
|
|
/*
|
|
* Submit a flush request to the device if it supports it. Error handling is
|
|
* done in the waiting counterpart.
|
|
*/
|
|
static void write_dev_flush(struct btrfs_device *device)
|
|
{
|
|
struct bio *bio = device->flush_bio;
|
|
|
|
#ifndef CONFIG_BTRFS_FS_CHECK_INTEGRITY
|
|
/*
|
|
* When a disk has write caching disabled, we skip submission of a bio
|
|
* with flush and sync requests before writing the superblock, since
|
|
* it's not needed. However when the integrity checker is enabled, this
|
|
* results in reports that there are metadata blocks referred by a
|
|
* superblock that were not properly flushed. So don't skip the bio
|
|
* submission only when the integrity checker is enabled for the sake
|
|
* of simplicity, since this is a debug tool and not meant for use in
|
|
* non-debug builds.
|
|
*/
|
|
struct request_queue *q = bdev_get_queue(device->bdev);
|
|
if (!test_bit(QUEUE_FLAG_WC, &q->queue_flags))
|
|
return;
|
|
#endif
|
|
|
|
bio_reset(bio);
|
|
bio->bi_end_io = btrfs_end_empty_barrier;
|
|
bio_set_dev(bio, device->bdev);
|
|
bio->bi_opf = REQ_OP_WRITE | REQ_SYNC | REQ_PREFLUSH;
|
|
init_completion(&device->flush_wait);
|
|
bio->bi_private = &device->flush_wait;
|
|
|
|
btrfsic_submit_bio(bio);
|
|
set_bit(BTRFS_DEV_STATE_FLUSH_SENT, &device->dev_state);
|
|
}
|
|
|
|
/*
|
|
* If the flush bio has been submitted by write_dev_flush, wait for it.
|
|
*/
|
|
static blk_status_t wait_dev_flush(struct btrfs_device *device)
|
|
{
|
|
struct bio *bio = device->flush_bio;
|
|
|
|
if (!test_bit(BTRFS_DEV_STATE_FLUSH_SENT, &device->dev_state))
|
|
return BLK_STS_OK;
|
|
|
|
clear_bit(BTRFS_DEV_STATE_FLUSH_SENT, &device->dev_state);
|
|
wait_for_completion_io(&device->flush_wait);
|
|
|
|
return bio->bi_status;
|
|
}
|
|
|
|
static int check_barrier_error(struct btrfs_fs_info *fs_info)
|
|
{
|
|
if (!btrfs_check_rw_degradable(fs_info, NULL))
|
|
return -EIO;
|
|
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;
|
|
int errors_wait = 0;
|
|
blk_status_t ret;
|
|
|
|
lockdep_assert_held(&info->fs_devices->device_list_mutex);
|
|
/* send down all the barriers */
|
|
head = &info->fs_devices->devices;
|
|
list_for_each_entry(dev, head, dev_list) {
|
|
if (test_bit(BTRFS_DEV_STATE_MISSING, &dev->dev_state))
|
|
continue;
|
|
if (!dev->bdev)
|
|
continue;
|
|
if (!test_bit(BTRFS_DEV_STATE_IN_FS_METADATA, &dev->dev_state) ||
|
|
!test_bit(BTRFS_DEV_STATE_WRITEABLE, &dev->dev_state))
|
|
continue;
|
|
|
|
write_dev_flush(dev);
|
|
dev->last_flush_error = BLK_STS_OK;
|
|
}
|
|
|
|
/* wait for all the barriers */
|
|
list_for_each_entry(dev, head, dev_list) {
|
|
if (test_bit(BTRFS_DEV_STATE_MISSING, &dev->dev_state))
|
|
continue;
|
|
if (!dev->bdev) {
|
|
errors_wait++;
|
|
continue;
|
|
}
|
|
if (!test_bit(BTRFS_DEV_STATE_IN_FS_METADATA, &dev->dev_state) ||
|
|
!test_bit(BTRFS_DEV_STATE_WRITEABLE, &dev->dev_state))
|
|
continue;
|
|
|
|
ret = wait_dev_flush(dev);
|
|
if (ret) {
|
|
dev->last_flush_error = ret;
|
|
btrfs_dev_stat_inc_and_print(dev,
|
|
BTRFS_DEV_STAT_FLUSH_ERRS);
|
|
errors_wait++;
|
|
}
|
|
}
|
|
|
|
if (errors_wait) {
|
|
/*
|
|
* At some point we need the status of all disks
|
|
* to arrive at the volume status. So error checking
|
|
* is being pushed to a separate loop.
|
|
*/
|
|
return check_barrier_error(info);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int btrfs_get_num_tolerated_disk_barrier_failures(u64 flags)
|
|
{
|
|
int raid_type;
|
|
int min_tolerated = INT_MAX;
|
|
|
|
if ((flags & BTRFS_BLOCK_GROUP_PROFILE_MASK) == 0 ||
|
|
(flags & BTRFS_AVAIL_ALLOC_BIT_SINGLE))
|
|
min_tolerated = min_t(int, min_tolerated,
|
|
btrfs_raid_array[BTRFS_RAID_SINGLE].
|
|
tolerated_failures);
|
|
|
|
for (raid_type = 0; raid_type < BTRFS_NR_RAID_TYPES; raid_type++) {
|
|
if (raid_type == BTRFS_RAID_SINGLE)
|
|
continue;
|
|
if (!(flags & btrfs_raid_array[raid_type].bg_flag))
|
|
continue;
|
|
min_tolerated = min_t(int, min_tolerated,
|
|
btrfs_raid_array[raid_type].
|
|
tolerated_failures);
|
|
}
|
|
|
|
if (min_tolerated == INT_MAX) {
|
|
pr_warn("BTRFS: unknown raid flag: %llu", flags);
|
|
min_tolerated = 0;
|
|
}
|
|
|
|
return min_tolerated;
|
|
}
|
|
|
|
int write_all_supers(struct btrfs_fs_info *fs_info, int max_mirrors)
|
|
{
|
|
struct list_head *head;
|
|
struct btrfs_device *dev;
|
|
struct btrfs_super_block *sb;
|
|
struct btrfs_dev_item *dev_item;
|
|
int ret;
|
|
int do_barriers;
|
|
int max_errors;
|
|
int total_errors = 0;
|
|
u64 flags;
|
|
|
|
do_barriers = !btrfs_test_opt(fs_info, NOBARRIER);
|
|
|
|
/*
|
|
* max_mirrors == 0 indicates we're from commit_transaction,
|
|
* not from fsync where the tree roots in fs_info have not
|
|
* been consistent on disk.
|
|
*/
|
|
if (max_mirrors == 0)
|
|
backup_super_roots(fs_info);
|
|
|
|
sb = fs_info->super_for_commit;
|
|
dev_item = &sb->dev_item;
|
|
|
|
mutex_lock(&fs_info->fs_devices->device_list_mutex);
|
|
head = &fs_info->fs_devices->devices;
|
|
max_errors = btrfs_super_num_devices(fs_info->super_copy) - 1;
|
|
|
|
if (do_barriers) {
|
|
ret = barrier_all_devices(fs_info);
|
|
if (ret) {
|
|
mutex_unlock(
|
|
&fs_info->fs_devices->device_list_mutex);
|
|
btrfs_handle_fs_error(fs_info, ret,
|
|
"errors while submitting device barriers.");
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
list_for_each_entry(dev, head, dev_list) {
|
|
if (!dev->bdev) {
|
|
total_errors++;
|
|
continue;
|
|
}
|
|
if (!test_bit(BTRFS_DEV_STATE_IN_FS_METADATA, &dev->dev_state) ||
|
|
!test_bit(BTRFS_DEV_STATE_WRITEABLE, &dev->dev_state))
|
|
continue;
|
|
|
|
btrfs_set_stack_device_generation(dev_item, 0);
|
|
btrfs_set_stack_device_type(dev_item, dev->type);
|
|
btrfs_set_stack_device_id(dev_item, dev->devid);
|
|
btrfs_set_stack_device_total_bytes(dev_item,
|
|
dev->commit_total_bytes);
|
|
btrfs_set_stack_device_bytes_used(dev_item,
|
|
dev->commit_bytes_used);
|
|
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);
|
|
memcpy(dev_item->fsid, dev->fs_devices->metadata_uuid,
|
|
BTRFS_FSID_SIZE);
|
|
|
|
flags = btrfs_super_flags(sb);
|
|
btrfs_set_super_flags(sb, flags | BTRFS_HEADER_FLAG_WRITTEN);
|
|
|
|
ret = btrfs_validate_write_super(fs_info, sb);
|
|
if (ret < 0) {
|
|
mutex_unlock(&fs_info->fs_devices->device_list_mutex);
|
|
btrfs_handle_fs_error(fs_info, -EUCLEAN,
|
|
"unexpected superblock corruption detected");
|
|
return -EUCLEAN;
|
|
}
|
|
|
|
ret = write_dev_supers(dev, sb, max_mirrors);
|
|
if (ret)
|
|
total_errors++;
|
|
}
|
|
if (total_errors > max_errors) {
|
|
btrfs_err(fs_info, "%d errors while writing supers",
|
|
total_errors);
|
|
mutex_unlock(&fs_info->fs_devices->device_list_mutex);
|
|
|
|
/* FUA is masked off if unsupported and can't be the reason */
|
|
btrfs_handle_fs_error(fs_info, -EIO,
|
|
"%d errors while writing supers",
|
|
total_errors);
|
|
return -EIO;
|
|
}
|
|
|
|
total_errors = 0;
|
|
list_for_each_entry(dev, head, dev_list) {
|
|
if (!dev->bdev)
|
|
continue;
|
|
if (!test_bit(BTRFS_DEV_STATE_IN_FS_METADATA, &dev->dev_state) ||
|
|
!test_bit(BTRFS_DEV_STATE_WRITEABLE, &dev->dev_state))
|
|
continue;
|
|
|
|
ret = wait_dev_supers(dev, max_mirrors);
|
|
if (ret)
|
|
total_errors++;
|
|
}
|
|
mutex_unlock(&fs_info->fs_devices->device_list_mutex);
|
|
if (total_errors > max_errors) {
|
|
btrfs_handle_fs_error(fs_info, -EIO,
|
|
"%d errors while writing supers",
|
|
total_errors);
|
|
return -EIO;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* 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)
|
|
{
|
|
bool drop_ref = false;
|
|
|
|
spin_lock(&fs_info->fs_roots_radix_lock);
|
|
radix_tree_delete(&fs_info->fs_roots_radix,
|
|
(unsigned long)root->root_key.objectid);
|
|
if (test_and_clear_bit(BTRFS_ROOT_IN_RADIX, &root->state))
|
|
drop_ref = true;
|
|
spin_unlock(&fs_info->fs_roots_radix_lock);
|
|
|
|
if (BTRFS_FS_ERROR(fs_info)) {
|
|
ASSERT(root->log_root == NULL);
|
|
if (root->reloc_root) {
|
|
btrfs_put_root(root->reloc_root);
|
|
root->reloc_root = NULL;
|
|
}
|
|
}
|
|
|
|
if (drop_ref)
|
|
btrfs_put_root(root);
|
|
}
|
|
|
|
int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info)
|
|
{
|
|
u64 root_objectid = 0;
|
|
struct btrfs_root *gang[8];
|
|
int i = 0;
|
|
int err = 0;
|
|
unsigned int ret = 0;
|
|
|
|
while (1) {
|
|
spin_lock(&fs_info->fs_roots_radix_lock);
|
|
ret = radix_tree_gang_lookup(&fs_info->fs_roots_radix,
|
|
(void **)gang, root_objectid,
|
|
ARRAY_SIZE(gang));
|
|
if (!ret) {
|
|
spin_unlock(&fs_info->fs_roots_radix_lock);
|
|
break;
|
|
}
|
|
root_objectid = gang[ret - 1]->root_key.objectid + 1;
|
|
|
|
for (i = 0; i < ret; i++) {
|
|
/* 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_root(gang[i]);
|
|
}
|
|
spin_unlock(&fs_info->fs_roots_radix_lock);
|
|
|
|
for (i = 0; i < ret; i++) {
|
|
if (!gang[i])
|
|
continue;
|
|
root_objectid = gang[i]->root_key.objectid;
|
|
err = btrfs_orphan_cleanup(gang[i]);
|
|
if (err)
|
|
break;
|
|
btrfs_put_root(gang[i]);
|
|
}
|
|
root_objectid++;
|
|
}
|
|
|
|
/* release the uncleaned roots due to error */
|
|
for (; i < ret; i++) {
|
|
if (gang[i])
|
|
btrfs_put_root(gang[i]);
|
|
}
|
|
return err;
|
|
}
|
|
|
|
int btrfs_commit_super(struct btrfs_fs_info *fs_info)
|
|
{
|
|
struct btrfs_root *root = fs_info->tree_root;
|
|
struct btrfs_trans_handle *trans;
|
|
|
|
mutex_lock(&fs_info->cleaner_mutex);
|
|
btrfs_run_delayed_iputs(fs_info);
|
|
mutex_unlock(&fs_info->cleaner_mutex);
|
|
wake_up_process(fs_info->cleaner_kthread);
|
|
|
|
/* wait until ongoing cleanup work done */
|
|
down_write(&fs_info->cleanup_work_sem);
|
|
up_write(&fs_info->cleanup_work_sem);
|
|
|
|
trans = btrfs_join_transaction(root);
|
|
if (IS_ERR(trans))
|
|
return PTR_ERR(trans);
|
|
return btrfs_commit_transaction(trans);
|
|
}
|
|
|
|
static void warn_about_uncommitted_trans(struct btrfs_fs_info *fs_info)
|
|
{
|
|
struct btrfs_transaction *trans;
|
|
struct btrfs_transaction *tmp;
|
|
bool found = false;
|
|
|
|
if (list_empty(&fs_info->trans_list))
|
|
return;
|
|
|
|
/*
|
|
* This function is only called at the very end of close_ctree(),
|
|
* thus no other running transaction, no need to take trans_lock.
|
|
*/
|
|
ASSERT(test_bit(BTRFS_FS_CLOSING_DONE, &fs_info->flags));
|
|
list_for_each_entry_safe(trans, tmp, &fs_info->trans_list, list) {
|
|
struct extent_state *cached = NULL;
|
|
u64 dirty_bytes = 0;
|
|
u64 cur = 0;
|
|
u64 found_start;
|
|
u64 found_end;
|
|
|
|
found = true;
|
|
while (!find_first_extent_bit(&trans->dirty_pages, cur,
|
|
&found_start, &found_end, EXTENT_DIRTY, &cached)) {
|
|
dirty_bytes += found_end + 1 - found_start;
|
|
cur = found_end + 1;
|
|
}
|
|
btrfs_warn(fs_info,
|
|
"transaction %llu (with %llu dirty metadata bytes) is not committed",
|
|
trans->transid, dirty_bytes);
|
|
btrfs_cleanup_one_transaction(trans, fs_info);
|
|
|
|
if (trans == fs_info->running_transaction)
|
|
fs_info->running_transaction = NULL;
|
|
list_del_init(&trans->list);
|
|
|
|
btrfs_put_transaction(trans);
|
|
trace_btrfs_transaction_commit(fs_info);
|
|
}
|
|
ASSERT(!found);
|
|
}
|
|
|
|
void __cold close_ctree(struct btrfs_fs_info *fs_info)
|
|
{
|
|
int ret;
|
|
|
|
set_bit(BTRFS_FS_CLOSING_START, &fs_info->flags);
|
|
/*
|
|
* We don't want the cleaner to start new transactions, add more delayed
|
|
* iputs, etc. while we're closing. We can't use kthread_stop() yet
|
|
* because that frees the task_struct, and the transaction kthread might
|
|
* still try to wake up the cleaner.
|
|
*/
|
|
kthread_park(fs_info->cleaner_kthread);
|
|
|
|
/* wait for the qgroup rescan worker to stop */
|
|
btrfs_qgroup_wait_for_completion(fs_info, false);
|
|
|
|
/* 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);
|
|
|
|
/* pause restriper - we want to resume on mount */
|
|
btrfs_pause_balance(fs_info);
|
|
|
|
btrfs_dev_replace_suspend_for_unmount(fs_info);
|
|
|
|
btrfs_scrub_cancel(fs_info);
|
|
|
|
/* 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 */
|
|
btrfs_cleanup_defrag_inodes(fs_info);
|
|
|
|
cancel_work_sync(&fs_info->async_reclaim_work);
|
|
cancel_work_sync(&fs_info->async_data_reclaim_work);
|
|
cancel_work_sync(&fs_info->preempt_reclaim_work);
|
|
|
|
cancel_work_sync(&fs_info->reclaim_bgs_work);
|
|
|
|
/* Cancel or finish ongoing discard work */
|
|
btrfs_discard_cleanup(fs_info);
|
|
|
|
if (!sb_rdonly(fs_info->sb)) {
|
|
/*
|
|
* The cleaner kthread is stopped, so do one final pass over
|
|
* unused block groups.
|
|
*/
|
|
btrfs_delete_unused_bgs(fs_info);
|
|
|
|
/*
|
|
* There might be existing delayed inode workers still running
|
|
* and holding an empty delayed inode item. We must wait for
|
|
* them to complete first because they can create a transaction.
|
|
* This happens when someone calls btrfs_balance_delayed_items()
|
|
* and then a transaction commit runs the same delayed nodes
|
|
* before any delayed worker has done something with the nodes.
|
|
* We must wait for any worker here and not at transaction
|
|
* commit time since that could cause a deadlock.
|
|
* This is a very rare case.
|
|
*/
|
|
btrfs_flush_workqueue(fs_info->delayed_workers);
|
|
|
|
ret = btrfs_commit_super(fs_info);
|
|
if (ret)
|
|
btrfs_err(fs_info, "commit super ret %d", ret);
|
|
}
|
|
|
|
if (BTRFS_FS_ERROR(fs_info))
|
|
btrfs_error_commit_super(fs_info);
|
|
|
|
kthread_stop(fs_info->transaction_kthread);
|
|
kthread_stop(fs_info->cleaner_kthread);
|
|
|
|
ASSERT(list_empty(&fs_info->delayed_iputs));
|
|
set_bit(BTRFS_FS_CLOSING_DONE, &fs_info->flags);
|
|
|
|
if (btrfs_check_quota_leak(fs_info)) {
|
|
WARN_ON(IS_ENABLED(CONFIG_BTRFS_DEBUG));
|
|
btrfs_err(fs_info, "qgroup reserved space leaked");
|
|
}
|
|
|
|
btrfs_free_qgroup_config(fs_info);
|
|
ASSERT(list_empty(&fs_info->delalloc_roots));
|
|
|
|
if (percpu_counter_sum(&fs_info->delalloc_bytes)) {
|
|
btrfs_info(fs_info, "at unmount delalloc count %lld",
|
|
percpu_counter_sum(&fs_info->delalloc_bytes));
|
|
}
|
|
|
|
if (percpu_counter_sum(&fs_info->ordered_bytes))
|
|
btrfs_info(fs_info, "at unmount dio bytes count %lld",
|
|
percpu_counter_sum(&fs_info->ordered_bytes));
|
|
|
|
btrfs_sysfs_remove_mounted(fs_info);
|
|
btrfs_sysfs_remove_fsid(fs_info->fs_devices);
|
|
|
|
btrfs_put_block_group_cache(fs_info);
|
|
|
|
/*
|
|
* 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);
|
|
btrfs_stop_all_workers(fs_info);
|
|
|
|
/* We shouldn't have any transaction open at this point */
|
|
warn_about_uncommitted_trans(fs_info);
|
|
|
|
clear_bit(BTRFS_FS_OPEN, &fs_info->flags);
|
|
free_root_pointers(fs_info, true);
|
|
btrfs_free_fs_roots(fs_info);
|
|
|
|
/*
|
|
* We must free the block groups after dropping the fs_roots as we could
|
|
* have had an IO error and have left over tree log blocks that aren't
|
|
* cleaned up until the fs roots are freed. This makes the block group
|
|
* accounting appear to be wrong because there's pending reserved bytes,
|
|
* so make sure we do the block group cleanup afterwards.
|
|
*/
|
|
btrfs_free_block_groups(fs_info);
|
|
|
|
iput(fs_info->btree_inode);
|
|
|
|
#ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
|
|
if (btrfs_test_opt(fs_info, CHECK_INTEGRITY))
|
|
btrfsic_unmount(fs_info->fs_devices);
|
|
#endif
|
|
|
|
btrfs_mapping_tree_free(&fs_info->mapping_tree);
|
|
btrfs_close_devices(fs_info->fs_devices);
|
|
}
|
|
|
|
int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid,
|
|
int atomic)
|
|
{
|
|
int ret;
|
|
struct inode *btree_inode = buf->pages[0]->mapping->host;
|
|
|
|
ret = extent_buffer_uptodate(buf);
|
|
if (!ret)
|
|
return ret;
|
|
|
|
ret = verify_parent_transid(&BTRFS_I(btree_inode)->io_tree, buf,
|
|
parent_transid, atomic);
|
|
if (ret == -EAGAIN)
|
|
return ret;
|
|
return !ret;
|
|
}
|
|
|
|
void btrfs_mark_buffer_dirty(struct extent_buffer *buf)
|
|
{
|
|
struct btrfs_fs_info *fs_info = buf->fs_info;
|
|
u64 transid = btrfs_header_generation(buf);
|
|
int was_dirty;
|
|
|
|
#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 using unmapped buffers as dirty
|
|
* outside of the sanity tests.
|
|
*/
|
|
if (unlikely(test_bit(EXTENT_BUFFER_UNMAPPED, &buf->bflags)))
|
|
return;
|
|
#endif
|
|
btrfs_assert_tree_write_locked(buf);
|
|
if (transid != fs_info->generation)
|
|
WARN(1, KERN_CRIT "btrfs transid mismatch buffer %llu, found %llu running %llu\n",
|
|
buf->start, transid, fs_info->generation);
|
|
was_dirty = set_extent_buffer_dirty(buf);
|
|
if (!was_dirty)
|
|
percpu_counter_add_batch(&fs_info->dirty_metadata_bytes,
|
|
buf->len,
|
|
fs_info->dirty_metadata_batch);
|
|
#ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
|
|
/*
|
|
* Since btrfs_mark_buffer_dirty() can be called with item pointer set
|
|
* but item data not updated.
|
|
* So here we should only check item pointers, not item data.
|
|
*/
|
|
if (btrfs_header_level(buf) == 0 &&
|
|
btrfs_check_leaf_relaxed(buf)) {
|
|
btrfs_print_leaf(buf);
|
|
ASSERT(0);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
static void __btrfs_btree_balance_dirty(struct btrfs_fs_info *fs_info,
|
|
int flush_delayed)
|
|
{
|
|
/*
|
|
* looks as though older kernels can get into trouble with
|
|
* this code, they end up stuck in balance_dirty_pages forever
|
|
*/
|
|
int ret;
|
|
|
|
if (current->flags & PF_MEMALLOC)
|
|
return;
|
|
|
|
if (flush_delayed)
|
|
btrfs_balance_delayed_items(fs_info);
|
|
|
|
ret = __percpu_counter_compare(&fs_info->dirty_metadata_bytes,
|
|
BTRFS_DIRTY_METADATA_THRESH,
|
|
fs_info->dirty_metadata_batch);
|
|
if (ret > 0) {
|
|
balance_dirty_pages_ratelimited(fs_info->btree_inode->i_mapping);
|
|
}
|
|
}
|
|
|
|
void btrfs_btree_balance_dirty(struct btrfs_fs_info *fs_info)
|
|
{
|
|
__btrfs_btree_balance_dirty(fs_info, 1);
|
|
}
|
|
|
|
void btrfs_btree_balance_dirty_nodelay(struct btrfs_fs_info *fs_info)
|
|
{
|
|
__btrfs_btree_balance_dirty(fs_info, 0);
|
|
}
|
|
|
|
int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid, int level,
|
|
struct btrfs_key *first_key)
|
|
{
|
|
return btree_read_extent_buffer_pages(buf, parent_transid,
|
|
level, first_key);
|
|
}
|
|
|
|
static void btrfs_error_commit_super(struct btrfs_fs_info *fs_info)
|
|
{
|
|
/* cleanup FS via transaction */
|
|
btrfs_cleanup_transaction(fs_info);
|
|
|
|
mutex_lock(&fs_info->cleaner_mutex);
|
|
btrfs_run_delayed_iputs(fs_info);
|
|
mutex_unlock(&fs_info->cleaner_mutex);
|
|
|
|
down_write(&fs_info->cleanup_work_sem);
|
|
up_write(&fs_info->cleanup_work_sem);
|
|
}
|
|
|
|
static void btrfs_drop_all_logs(struct btrfs_fs_info *fs_info)
|
|
{
|
|
struct btrfs_root *gang[8];
|
|
u64 root_objectid = 0;
|
|
int ret;
|
|
|
|
spin_lock(&fs_info->fs_roots_radix_lock);
|
|
while ((ret = radix_tree_gang_lookup(&fs_info->fs_roots_radix,
|
|
(void **)gang, root_objectid,
|
|
ARRAY_SIZE(gang))) != 0) {
|
|
int i;
|
|
|
|
for (i = 0; i < ret; i++)
|
|
gang[i] = btrfs_grab_root(gang[i]);
|
|
spin_unlock(&fs_info->fs_roots_radix_lock);
|
|
|
|
for (i = 0; i < ret; i++) {
|
|
if (!gang[i])
|
|
continue;
|
|
root_objectid = gang[i]->root_key.objectid;
|
|
btrfs_free_log(NULL, gang[i]);
|
|
btrfs_put_root(gang[i]);
|
|
}
|
|
root_objectid++;
|
|
spin_lock(&fs_info->fs_roots_radix_lock);
|
|
}
|
|
spin_unlock(&fs_info->fs_roots_radix_lock);
|
|
btrfs_free_log_root_tree(NULL, fs_info);
|
|
}
|
|
|
|
static void btrfs_destroy_ordered_extents(struct btrfs_root *root)
|
|
{
|
|
struct btrfs_ordered_extent *ordered;
|
|
|
|
spin_lock(&root->ordered_extent_lock);
|
|
/*
|
|
* This will just short circuit the ordered completion stuff which will
|
|
* make sure the ordered extent gets properly cleaned up.
|
|
*/
|
|
list_for_each_entry(ordered, &root->ordered_extents,
|
|
root_extent_list)
|
|
set_bit(BTRFS_ORDERED_IOERR, &ordered->flags);
|
|
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);
|
|
list_move_tail(&root->ordered_root,
|
|
&fs_info->ordered_roots);
|
|
|
|
spin_unlock(&fs_info->ordered_root_lock);
|
|
btrfs_destroy_ordered_extents(root);
|
|
|
|
cond_resched();
|
|
spin_lock(&fs_info->ordered_root_lock);
|
|
}
|
|
spin_unlock(&fs_info->ordered_root_lock);
|
|
|
|
/*
|
|
* We need this here because if we've been flipped read-only we won't
|
|
* get sync() from the umount, so we need to make sure any ordered
|
|
* extents that haven't had their dirty pages IO start writeout yet
|
|
* actually get run and error out properly.
|
|
*/
|
|
btrfs_wait_ordered_roots(fs_info, U64_MAX, 0, (u64)-1);
|
|
}
|
|
|
|
static int btrfs_destroy_delayed_refs(struct btrfs_transaction *trans,
|
|
struct btrfs_fs_info *fs_info)
|
|
{
|
|
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);
|
|
if (atomic_read(&delayed_refs->num_entries) == 0) {
|
|
spin_unlock(&delayed_refs->lock);
|
|
btrfs_debug(fs_info, "delayed_refs has NO entry");
|
|
return ret;
|
|
}
|
|
|
|
while ((node = rb_first_cached(&delayed_refs->href_root)) != NULL) {
|
|
struct btrfs_delayed_ref_head *head;
|
|
struct rb_node *n;
|
|
bool pin_bytes = false;
|
|
|
|
head = rb_entry(node, struct btrfs_delayed_ref_head,
|
|
href_node);
|
|
if (btrfs_delayed_ref_lock(delayed_refs, head))
|
|
continue;
|
|
|
|
spin_lock(&head->lock);
|
|
while ((n = rb_first_cached(&head->ref_tree)) != NULL) {
|
|
ref = rb_entry(n, struct btrfs_delayed_ref_node,
|
|
ref_node);
|
|
ref->in_tree = 0;
|
|
rb_erase_cached(&ref->ref_node, &head->ref_tree);
|
|
RB_CLEAR_NODE(&ref->ref_node);
|
|
if (!list_empty(&ref->add_list))
|
|
list_del(&ref->add_list);
|
|
atomic_dec(&delayed_refs->num_entries);
|
|
btrfs_put_delayed_ref(ref);
|
|
}
|
|
if (head->must_insert_reserved)
|
|
pin_bytes = true;
|
|
btrfs_free_delayed_extent_op(head->extent_op);
|
|
btrfs_delete_ref_head(delayed_refs, head);
|
|
spin_unlock(&head->lock);
|
|
spin_unlock(&delayed_refs->lock);
|
|
mutex_unlock(&head->mutex);
|
|
|
|
if (pin_bytes) {
|
|
struct btrfs_block_group *cache;
|
|
|
|
cache = btrfs_lookup_block_group(fs_info, head->bytenr);
|
|
BUG_ON(!cache);
|
|
|
|
spin_lock(&cache->space_info->lock);
|
|
spin_lock(&cache->lock);
|
|
cache->pinned += head->num_bytes;
|
|
btrfs_space_info_update_bytes_pinned(fs_info,
|
|
cache->space_info, head->num_bytes);
|
|
cache->reserved -= head->num_bytes;
|
|
cache->space_info->bytes_reserved -= head->num_bytes;
|
|
spin_unlock(&cache->lock);
|
|
spin_unlock(&cache->space_info->lock);
|
|
|
|
btrfs_put_block_group(cache);
|
|
|
|
btrfs_error_unpin_extent_range(fs_info, head->bytenr,
|
|
head->bytenr + head->num_bytes - 1);
|
|
}
|
|
btrfs_cleanup_ref_head_accounting(fs_info, delayed_refs, head);
|
|
btrfs_put_delayed_ref_head(head);
|
|
cond_resched();
|
|
spin_lock(&delayed_refs->lock);
|
|
}
|
|
btrfs_qgroup_destroy_extent_records(trans);
|
|
|
|
spin_unlock(&delayed_refs->lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void btrfs_destroy_delalloc_inodes(struct btrfs_root *root)
|
|
{
|
|
struct btrfs_inode *btrfs_inode;
|
|
struct list_head splice;
|
|
|
|
INIT_LIST_HEAD(&splice);
|
|
|
|
spin_lock(&root->delalloc_lock);
|
|
list_splice_init(&root->delalloc_inodes, &splice);
|
|
|
|
while (!list_empty(&splice)) {
|
|
struct inode *inode = NULL;
|
|
btrfs_inode = list_first_entry(&splice, struct btrfs_inode,
|
|
delalloc_inodes);
|
|
__btrfs_del_delalloc_inode(root, btrfs_inode);
|
|
spin_unlock(&root->delalloc_lock);
|
|
|
|
/*
|
|
* Make sure we get a live inode and that it'll not disappear
|
|
* meanwhile.
|
|
*/
|
|
inode = igrab(&btrfs_inode->vfs_inode);
|
|
if (inode) {
|
|
invalidate_inode_pages2(inode->i_mapping);
|
|
iput(inode);
|
|
}
|
|
spin_lock(&root->delalloc_lock);
|
|
}
|
|
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);
|
|
root = btrfs_grab_root(root);
|
|
BUG_ON(!root);
|
|
spin_unlock(&fs_info->delalloc_root_lock);
|
|
|
|
btrfs_destroy_delalloc_inodes(root);
|
|
btrfs_put_root(root);
|
|
|
|
spin_lock(&fs_info->delalloc_root_lock);
|
|
}
|
|
spin_unlock(&fs_info->delalloc_root_lock);
|
|
}
|
|
|
|
static int btrfs_destroy_marked_extents(struct btrfs_fs_info *fs_info,
|
|
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,
|
|
mark, NULL);
|
|
if (ret)
|
|
break;
|
|
|
|
clear_extent_bits(dirty_pages, start, end, mark);
|
|
while (start <= end) {
|
|
eb = find_extent_buffer(fs_info, start);
|
|
start += fs_info->nodesize;
|
|
if (!eb)
|
|
continue;
|
|
wait_on_extent_buffer_writeback(eb);
|
|
|
|
if (test_and_clear_bit(EXTENT_BUFFER_DIRTY,
|
|
&eb->bflags))
|
|
clear_extent_buffer_dirty(eb);
|
|
free_extent_buffer_stale(eb);
|
|
}
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int btrfs_destroy_pinned_extent(struct btrfs_fs_info *fs_info,
|
|
struct extent_io_tree *unpin)
|
|
{
|
|
u64 start;
|
|
u64 end;
|
|
int ret;
|
|
|
|
while (1) {
|
|
struct extent_state *cached_state = NULL;
|
|
|
|
/*
|
|
* The btrfs_finish_extent_commit() may get the same range as
|
|
* ours between find_first_extent_bit and clear_extent_dirty.
|
|
* Hence, hold the unused_bg_unpin_mutex to avoid double unpin
|
|
* the same extent range.
|
|
*/
|
|
mutex_lock(&fs_info->unused_bg_unpin_mutex);
|
|
ret = find_first_extent_bit(unpin, 0, &start, &end,
|
|
EXTENT_DIRTY, &cached_state);
|
|
if (ret) {
|
|
mutex_unlock(&fs_info->unused_bg_unpin_mutex);
|
|
break;
|
|
}
|
|
|
|
clear_extent_dirty(unpin, start, end, &cached_state);
|
|
free_extent_state(cached_state);
|
|
btrfs_error_unpin_extent_range(fs_info, start, end);
|
|
mutex_unlock(&fs_info->unused_bg_unpin_mutex);
|
|
cond_resched();
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void btrfs_cleanup_bg_io(struct btrfs_block_group *cache)
|
|
{
|
|
struct inode *inode;
|
|
|
|
inode = cache->io_ctl.inode;
|
|
if (inode) {
|
|
invalidate_inode_pages2(inode->i_mapping);
|
|
BTRFS_I(inode)->generation = 0;
|
|
cache->io_ctl.inode = NULL;
|
|
iput(inode);
|
|
}
|
|
ASSERT(cache->io_ctl.pages == NULL);
|
|
btrfs_put_block_group(cache);
|
|
}
|
|
|
|
void btrfs_cleanup_dirty_bgs(struct btrfs_transaction *cur_trans,
|
|
struct btrfs_fs_info *fs_info)
|
|
{
|
|
struct btrfs_block_group *cache;
|
|
|
|
spin_lock(&cur_trans->dirty_bgs_lock);
|
|
while (!list_empty(&cur_trans->dirty_bgs)) {
|
|
cache = list_first_entry(&cur_trans->dirty_bgs,
|
|
struct btrfs_block_group,
|
|
dirty_list);
|
|
|
|
if (!list_empty(&cache->io_list)) {
|
|
spin_unlock(&cur_trans->dirty_bgs_lock);
|
|
list_del_init(&cache->io_list);
|
|
btrfs_cleanup_bg_io(cache);
|
|
spin_lock(&cur_trans->dirty_bgs_lock);
|
|
}
|
|
|
|
list_del_init(&cache->dirty_list);
|
|
spin_lock(&cache->lock);
|
|
cache->disk_cache_state = BTRFS_DC_ERROR;
|
|
spin_unlock(&cache->lock);
|
|
|
|
spin_unlock(&cur_trans->dirty_bgs_lock);
|
|
btrfs_put_block_group(cache);
|
|
btrfs_delayed_refs_rsv_release(fs_info, 1);
|
|
spin_lock(&cur_trans->dirty_bgs_lock);
|
|
}
|
|
spin_unlock(&cur_trans->dirty_bgs_lock);
|
|
|
|
/*
|
|
* Refer to the definition of io_bgs member for details why it's safe
|
|
* to use it without any locking
|
|
*/
|
|
while (!list_empty(&cur_trans->io_bgs)) {
|
|
cache = list_first_entry(&cur_trans->io_bgs,
|
|
struct btrfs_block_group,
|
|
io_list);
|
|
|
|
list_del_init(&cache->io_list);
|
|
spin_lock(&cache->lock);
|
|
cache->disk_cache_state = BTRFS_DC_ERROR;
|
|
spin_unlock(&cache->lock);
|
|
btrfs_cleanup_bg_io(cache);
|
|
}
|
|
}
|
|
|
|
void btrfs_cleanup_one_transaction(struct btrfs_transaction *cur_trans,
|
|
struct btrfs_fs_info *fs_info)
|
|
{
|
|
struct btrfs_device *dev, *tmp;
|
|
|
|
btrfs_cleanup_dirty_bgs(cur_trans, fs_info);
|
|
ASSERT(list_empty(&cur_trans->dirty_bgs));
|
|
ASSERT(list_empty(&cur_trans->io_bgs));
|
|
|
|
list_for_each_entry_safe(dev, tmp, &cur_trans->dev_update_list,
|
|
post_commit_list) {
|
|
list_del_init(&dev->post_commit_list);
|
|
}
|
|
|
|
btrfs_destroy_delayed_refs(cur_trans, fs_info);
|
|
|
|
cur_trans->state = TRANS_STATE_COMMIT_START;
|
|
wake_up(&fs_info->transaction_blocked_wait);
|
|
|
|
cur_trans->state = TRANS_STATE_UNBLOCKED;
|
|
wake_up(&fs_info->transaction_wait);
|
|
|
|
btrfs_destroy_delayed_inodes(fs_info);
|
|
|
|
btrfs_destroy_marked_extents(fs_info, &cur_trans->dirty_pages,
|
|
EXTENT_DIRTY);
|
|
btrfs_destroy_pinned_extent(fs_info, &cur_trans->pinned_extents);
|
|
|
|
btrfs_free_redirty_list(cur_trans);
|
|
|
|
cur_trans->state =TRANS_STATE_COMPLETED;
|
|
wake_up(&cur_trans->commit_wait);
|
|
}
|
|
|
|
static int btrfs_cleanup_transaction(struct btrfs_fs_info *fs_info)
|
|
{
|
|
struct btrfs_transaction *t;
|
|
|
|
mutex_lock(&fs_info->transaction_kthread_mutex);
|
|
|
|
spin_lock(&fs_info->trans_lock);
|
|
while (!list_empty(&fs_info->trans_list)) {
|
|
t = list_first_entry(&fs_info->trans_list,
|
|
struct btrfs_transaction, list);
|
|
if (t->state >= TRANS_STATE_COMMIT_START) {
|
|
refcount_inc(&t->use_count);
|
|
spin_unlock(&fs_info->trans_lock);
|
|
btrfs_wait_for_commit(fs_info, t->transid);
|
|
btrfs_put_transaction(t);
|
|
spin_lock(&fs_info->trans_lock);
|
|
continue;
|
|
}
|
|
if (t == fs_info->running_transaction) {
|
|
t->state = TRANS_STATE_COMMIT_DOING;
|
|
spin_unlock(&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(&fs_info->trans_lock);
|
|
}
|
|
btrfs_cleanup_one_transaction(t, fs_info);
|
|
|
|
spin_lock(&fs_info->trans_lock);
|
|
if (t == fs_info->running_transaction)
|
|
fs_info->running_transaction = NULL;
|
|
list_del_init(&t->list);
|
|
spin_unlock(&fs_info->trans_lock);
|
|
|
|
btrfs_put_transaction(t);
|
|
trace_btrfs_transaction_commit(fs_info);
|
|
spin_lock(&fs_info->trans_lock);
|
|
}
|
|
spin_unlock(&fs_info->trans_lock);
|
|
btrfs_destroy_all_ordered_extents(fs_info);
|
|
btrfs_destroy_delayed_inodes(fs_info);
|
|
btrfs_assert_delayed_root_empty(fs_info);
|
|
btrfs_destroy_all_delalloc_inodes(fs_info);
|
|
btrfs_drop_all_logs(fs_info);
|
|
mutex_unlock(&fs_info->transaction_kthread_mutex);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int btrfs_init_root_free_objectid(struct btrfs_root *root)
|
|
{
|
|
struct btrfs_path *path;
|
|
int ret;
|
|
struct extent_buffer *l;
|
|
struct btrfs_key search_key;
|
|
struct btrfs_key found_key;
|
|
int slot;
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
|
|
search_key.objectid = BTRFS_LAST_FREE_OBJECTID;
|
|
search_key.type = -1;
|
|
search_key.offset = (u64)-1;
|
|
ret = btrfs_search_slot(NULL, root, &search_key, path, 0, 0);
|
|
if (ret < 0)
|
|
goto error;
|
|
BUG_ON(ret == 0); /* Corruption */
|
|
if (path->slots[0] > 0) {
|
|
slot = path->slots[0] - 1;
|
|
l = path->nodes[0];
|
|
btrfs_item_key_to_cpu(l, &found_key, slot);
|
|
root->free_objectid = max_t(u64, found_key.objectid + 1,
|
|
BTRFS_FIRST_FREE_OBJECTID);
|
|
} else {
|
|
root->free_objectid = BTRFS_FIRST_FREE_OBJECTID;
|
|
}
|
|
ret = 0;
|
|
error:
|
|
btrfs_free_path(path);
|
|
return ret;
|
|
}
|
|
|
|
int btrfs_get_free_objectid(struct btrfs_root *root, u64 *objectid)
|
|
{
|
|
int ret;
|
|
mutex_lock(&root->objectid_mutex);
|
|
|
|
if (unlikely(root->free_objectid >= BTRFS_LAST_FREE_OBJECTID)) {
|
|
btrfs_warn(root->fs_info,
|
|
"the objectid of root %llu reaches its highest value",
|
|
root->root_key.objectid);
|
|
ret = -ENOSPC;
|
|
goto out;
|
|
}
|
|
|
|
*objectid = root->free_objectid++;
|
|
ret = 0;
|
|
out:
|
|
mutex_unlock(&root->objectid_mutex);
|
|
return ret;
|
|
}
|