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|
- // SPDX-License-Identifier: GPL-2.0
- /*
- * Copyright (C) 2007 Oracle. All rights reserved.
- */
- #include <linux/fs.h>
- #include <linux/blkdev.h>
- #include <linux/radix-tree.h>
- #include <linux/writeback.h>
- #include <linux/buffer_head.h>
- #include <linux/workqueue.h>
- #include <linux/kthread.h>
- #include <linux/slab.h>
- #include <linux/migrate.h>
- #include <linux/ratelimit.h>
- #include <linux/uuid.h>
- #include <linux/semaphore.h>
- #include <linux/error-injection.h>
- #include <linux/crc32c.h>
- #include <linux/sched/mm.h>
- #include <asm/unaligned.h>
- #include <crypto/hash.h>
- #include "ctree.h"
- #include "disk-io.h"
- #include "transaction.h"
- #include "btrfs_inode.h"
- #include "volumes.h"
- #include "print-tree.h"
- #include "locking.h"
- #include "tree-log.h"
- #include "free-space-cache.h"
- #include "free-space-tree.h"
- #include "inode-map.h"
- #include "check-integrity.h"
- #include "rcu-string.h"
- #include "dev-replace.h"
- #include "raid56.h"
- #include "sysfs.h"
- #include "qgroup.h"
- #include "compression.h"
- #include "tree-checker.h"
- #include "ref-verify.h"
- #include "block-group.h"
- #define BTRFS_SUPER_FLAG_SUPP (BTRFS_HEADER_FLAG_WRITTEN |\
- BTRFS_HEADER_FLAG_RELOC |\
- BTRFS_SUPER_FLAG_ERROR |\
- BTRFS_SUPER_FLAG_SEEDING |\
- BTRFS_SUPER_FLAG_METADUMP |\
- BTRFS_SUPER_FLAG_METADUMP_V2)
- static const struct extent_io_ops btree_extent_io_ops;
- static void end_workqueue_fn(struct btrfs_work *work);
- static void btrfs_destroy_ordered_extents(struct btrfs_root *root);
- static int btrfs_destroy_delayed_refs(struct btrfs_transaction *trans,
- struct btrfs_fs_info *fs_info);
- static void btrfs_destroy_delalloc_inodes(struct btrfs_root *root);
- static int btrfs_destroy_marked_extents(struct btrfs_fs_info *fs_info,
- struct extent_io_tree *dirty_pages,
- int mark);
- static int btrfs_destroy_pinned_extent(struct btrfs_fs_info *fs_info,
- struct extent_io_tree *pinned_extents);
- static int btrfs_cleanup_transaction(struct btrfs_fs_info *fs_info);
- static void btrfs_error_commit_super(struct btrfs_fs_info *fs_info);
- /*
- * btrfs_end_io_wq structs are used to do processing in task context when an IO
- * is complete. This is used during reads to verify checksums, and it is used
- * by writes to insert metadata for new file extents after IO is complete.
- */
- struct btrfs_end_io_wq {
- struct bio *bio;
- bio_end_io_t *end_io;
- void *private;
- struct btrfs_fs_info *info;
- blk_status_t status;
- enum btrfs_wq_endio_type metadata;
- struct btrfs_work work;
- };
- static struct kmem_cache *btrfs_end_io_wq_cache;
- int __init btrfs_end_io_wq_init(void)
- {
- btrfs_end_io_wq_cache = kmem_cache_create("btrfs_end_io_wq",
- sizeof(struct btrfs_end_io_wq),
- 0,
- SLAB_MEM_SPREAD,
- NULL);
- if (!btrfs_end_io_wq_cache)
- return -ENOMEM;
- return 0;
- }
- void __cold btrfs_end_io_wq_exit(void)
- {
- kmem_cache_destroy(btrfs_end_io_wq_cache);
- }
- /*
- * async submit bios are used to offload expensive checksumming
- * onto the worker threads. They checksum file and metadata bios
- * just before they are sent down the IO stack.
- */
- struct async_submit_bio {
- void *private_data;
- struct bio *bio;
- extent_submit_bio_start_t *submit_bio_start;
- int mirror_num;
- /*
- * bio_offset is optional, can be used if the pages in the bio
- * can't tell us where in the file the bio should go
- */
- u64 bio_offset;
- struct btrfs_work work;
- blk_status_t status;
- };
- /*
- * Lockdep class keys for extent_buffer->lock's in this root. For a given
- * eb, the lockdep key is determined by the btrfs_root it belongs to and
- * the level the eb occupies in the tree.
- *
- * Different roots are used for different purposes and may nest inside each
- * other and they require separate keysets. As lockdep keys should be
- * static, assign keysets according to the purpose of the root as indicated
- * by btrfs_root->root_key.objectid. This ensures that all special purpose
- * roots have separate keysets.
- *
- * Lock-nesting across peer nodes is always done with the immediate parent
- * node locked thus preventing deadlock. As lockdep doesn't know this, use
- * subclass to avoid triggering lockdep warning in such cases.
- *
- * The key is set by the readpage_end_io_hook after the buffer has passed
- * csum validation but before the pages are unlocked. It is also set by
- * btrfs_init_new_buffer on freshly allocated blocks.
- *
- * We also add a check to make sure the highest level of the tree is the
- * same as our lockdep setup here. If BTRFS_MAX_LEVEL changes, this code
- * needs update as well.
- */
- #ifdef CONFIG_DEBUG_LOCK_ALLOC
- # if BTRFS_MAX_LEVEL != 8
- # error
- # endif
- static struct btrfs_lockdep_keyset {
- u64 id; /* root objectid */
- const char *name_stem; /* lock name stem */
- char names[BTRFS_MAX_LEVEL + 1][20];
- struct lock_class_key keys[BTRFS_MAX_LEVEL + 1];
- } btrfs_lockdep_keysets[] = {
- { .id = BTRFS_ROOT_TREE_OBJECTID, .name_stem = "root" },
- { .id = BTRFS_EXTENT_TREE_OBJECTID, .name_stem = "extent" },
- { .id = BTRFS_CHUNK_TREE_OBJECTID, .name_stem = "chunk" },
- { .id = BTRFS_DEV_TREE_OBJECTID, .name_stem = "dev" },
- { .id = BTRFS_FS_TREE_OBJECTID, .name_stem = "fs" },
- { .id = BTRFS_CSUM_TREE_OBJECTID, .name_stem = "csum" },
- { .id = BTRFS_QUOTA_TREE_OBJECTID, .name_stem = "quota" },
- { .id = BTRFS_TREE_LOG_OBJECTID, .name_stem = "log" },
- { .id = BTRFS_TREE_RELOC_OBJECTID, .name_stem = "treloc" },
- { .id = BTRFS_DATA_RELOC_TREE_OBJECTID, .name_stem = "dreloc" },
- { .id = BTRFS_UUID_TREE_OBJECTID, .name_stem = "uuid" },
- { .id = BTRFS_FREE_SPACE_TREE_OBJECTID, .name_stem = "free-space" },
- { .id = 0, .name_stem = "tree" },
- };
- void __init btrfs_init_lockdep(void)
- {
- int i, j;
- /* initialize lockdep class names */
- for (i = 0; i < ARRAY_SIZE(btrfs_lockdep_keysets); i++) {
- struct btrfs_lockdep_keyset *ks = &btrfs_lockdep_keysets[i];
- for (j = 0; j < ARRAY_SIZE(ks->names); j++)
- snprintf(ks->names[j], sizeof(ks->names[j]),
- "btrfs-%s-%02d", ks->name_stem, j);
- }
- }
- void btrfs_set_buffer_lockdep_class(u64 objectid, struct extent_buffer *eb,
- int level)
- {
- struct btrfs_lockdep_keyset *ks;
- BUG_ON(level >= ARRAY_SIZE(ks->keys));
- /* find the matching keyset, id 0 is the default entry */
- for (ks = btrfs_lockdep_keysets; ks->id; ks++)
- if (ks->id == objectid)
- break;
- lockdep_set_class_and_name(&eb->lock,
- &ks->keys[level], ks->names[level]);
- }
- #endif
- /*
- * extents on the btree inode are pretty simple, there's one extent
- * that covers the entire device
- */
- struct extent_map *btree_get_extent(struct btrfs_inode *inode,
- struct page *page, size_t pg_offset, u64 start, u64 len,
- int create)
- {
- struct btrfs_fs_info *fs_info = inode->root->fs_info;
- struct extent_map_tree *em_tree = &inode->extent_tree;
- struct extent_map *em;
- int ret;
- read_lock(&em_tree->lock);
- em = lookup_extent_mapping(em_tree, start, len);
- if (em) {
- em->bdev = fs_info->fs_devices->latest_bdev;
- read_unlock(&em_tree->lock);
- goto out;
- }
- read_unlock(&em_tree->lock);
- em = alloc_extent_map();
- if (!em) {
- em = ERR_PTR(-ENOMEM);
- goto out;
- }
- em->start = 0;
- em->len = (u64)-1;
- em->block_len = (u64)-1;
- em->block_start = 0;
- em->bdev = fs_info->fs_devices->latest_bdev;
- write_lock(&em_tree->lock);
- ret = add_extent_mapping(em_tree, em, 0);
- if (ret == -EEXIST) {
- free_extent_map(em);
- em = lookup_extent_mapping(em_tree, start, len);
- if (!em)
- em = ERR_PTR(-EIO);
- } else if (ret) {
- free_extent_map(em);
- em = ERR_PTR(ret);
- }
- write_unlock(&em_tree->lock);
- out:
- return em;
- }
- /*
- * Compute the csum of a btree block and store the result to provided buffer.
- *
- * Returns error if the extent buffer cannot be mapped.
- */
- static int csum_tree_block(struct extent_buffer *buf, u8 *result)
- {
- struct btrfs_fs_info *fs_info = buf->fs_info;
- SHASH_DESC_ON_STACK(shash, fs_info->csum_shash);
- unsigned long len;
- unsigned long cur_len;
- unsigned long offset = BTRFS_CSUM_SIZE;
- char *kaddr;
- unsigned long map_start;
- unsigned long map_len;
- int err;
- shash->tfm = fs_info->csum_shash;
- crypto_shash_init(shash);
- len = buf->len - offset;
- while (len > 0) {
- /*
- * Note: we don't need to check for the err == 1 case here, as
- * with the given combination of 'start = BTRFS_CSUM_SIZE (32)'
- * and 'min_len = 32' and the currently implemented mapping
- * algorithm we cannot cross a page boundary.
- */
- err = map_private_extent_buffer(buf, offset, 32,
- &kaddr, &map_start, &map_len);
- if (WARN_ON(err))
- return err;
- cur_len = min(len, map_len - (offset - map_start));
- crypto_shash_update(shash, kaddr + offset - map_start, cur_len);
- len -= cur_len;
- offset += cur_len;
- }
- memset(result, 0, BTRFS_CSUM_SIZE);
- crypto_shash_final(shash, result);
- return 0;
- }
- /*
- * we can't consider a given block up to date unless the transid of the
- * block matches the transid in the parent node's pointer. This is how we
- * detect blocks that either didn't get written at all or got written
- * in the wrong place.
- */
- static int verify_parent_transid(struct extent_io_tree *io_tree,
- struct extent_buffer *eb, u64 parent_transid,
- int atomic)
- {
- struct extent_state *cached_state = NULL;
- int ret;
- bool need_lock = (current->journal_info == BTRFS_SEND_TRANS_STUB);
- if (!parent_transid || btrfs_header_generation(eb) == parent_transid)
- return 0;
- if (atomic)
- return -EAGAIN;
- if (need_lock) {
- btrfs_tree_read_lock(eb);
- btrfs_set_lock_blocking_read(eb);
- }
- lock_extent_bits(io_tree, eb->start, eb->start + eb->len - 1,
- &cached_state);
- if (extent_buffer_uptodate(eb) &&
- btrfs_header_generation(eb) == parent_transid) {
- ret = 0;
- goto out;
- }
- btrfs_err_rl(eb->fs_info,
- "parent transid verify failed on %llu wanted %llu found %llu",
- eb->start,
- parent_transid, btrfs_header_generation(eb));
- ret = 1;
- /*
- * Things reading via commit roots that don't have normal protection,
- * like send, can have a really old block in cache that may point at a
- * block that has been freed and re-allocated. So don't clear uptodate
- * if we find an eb that is under IO (dirty/writeback) because we could
- * end up reading in the stale data and then writing it back out and
- * making everybody very sad.
- */
- if (!extent_buffer_under_io(eb))
- clear_extent_buffer_uptodate(eb);
- out:
- unlock_extent_cached(io_tree, eb->start, eb->start + eb->len - 1,
- &cached_state);
- if (need_lock)
- btrfs_tree_read_unlock_blocking(eb);
- return ret;
- }
- static bool btrfs_supported_super_csum(u16 csum_type)
- {
- switch (csum_type) {
- case BTRFS_CSUM_TYPE_CRC32:
- return true;
- default:
- return false;
- }
- }
- /*
- * Return 0 if the superblock checksum type matches the checksum value of that
- * algorithm. Pass the raw disk superblock data.
- */
- static int btrfs_check_super_csum(struct btrfs_fs_info *fs_info,
- char *raw_disk_sb)
- {
- struct btrfs_super_block *disk_sb =
- (struct btrfs_super_block *)raw_disk_sb;
- char result[BTRFS_CSUM_SIZE];
- SHASH_DESC_ON_STACK(shash, fs_info->csum_shash);
- shash->tfm = fs_info->csum_shash;
- crypto_shash_init(shash);
- /*
- * The super_block structure does not span the whole
- * BTRFS_SUPER_INFO_SIZE range, we expect that the unused space is
- * filled with zeros and is included in the checksum.
- */
- crypto_shash_update(shash, raw_disk_sb + BTRFS_CSUM_SIZE,
- BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
- crypto_shash_final(shash, result);
- if (memcmp(disk_sb->csum, result, btrfs_super_csum_size(disk_sb)))
- return 1;
- return 0;
- }
- int btrfs_verify_level_key(struct extent_buffer *eb, int level,
- struct btrfs_key *first_key, u64 parent_transid)
- {
- struct btrfs_fs_info *fs_info = eb->fs_info;
- int found_level;
- struct btrfs_key found_key;
- int ret;
- found_level = btrfs_header_level(eb);
- if (found_level != level) {
- WARN(IS_ENABLED(CONFIG_BTRFS_DEBUG),
- KERN_ERR "BTRFS: tree level check failed\n");
- btrfs_err(fs_info,
- "tree level mismatch detected, bytenr=%llu level expected=%u has=%u",
- eb->start, level, found_level);
- return -EIO;
- }
- if (!first_key)
- return 0;
- /*
- * For live tree block (new tree blocks in current transaction),
- * we need proper lock context to avoid race, which is impossible here.
- * So we only checks tree blocks which is read from disk, whose
- * generation <= fs_info->last_trans_committed.
- */
- if (btrfs_header_generation(eb) > fs_info->last_trans_committed)
- return 0;
- /* We have @first_key, so this @eb must have at least one item */
- if (btrfs_header_nritems(eb) == 0) {
- btrfs_err(fs_info,
- "invalid tree nritems, bytenr=%llu nritems=0 expect >0",
- eb->start);
- WARN_ON(IS_ENABLED(CONFIG_BTRFS_DEBUG));
- return -EUCLEAN;
- }
- if (found_level)
- btrfs_node_key_to_cpu(eb, &found_key, 0);
- else
- btrfs_item_key_to_cpu(eb, &found_key, 0);
- ret = btrfs_comp_cpu_keys(first_key, &found_key);
- if (ret) {
- WARN(IS_ENABLED(CONFIG_BTRFS_DEBUG),
- KERN_ERR "BTRFS: tree first key check failed\n");
- btrfs_err(fs_info,
- "tree first key mismatch detected, bytenr=%llu parent_transid=%llu key expected=(%llu,%u,%llu) has=(%llu,%u,%llu)",
- eb->start, parent_transid, first_key->objectid,
- first_key->type, first_key->offset,
- found_key.objectid, found_key.type,
- found_key.offset);
- }
- return ret;
- }
- /*
- * helper to read a given tree block, doing retries as required when
- * the checksums don't match and we have alternate mirrors to try.
- *
- * @parent_transid: expected transid, skip check if 0
- * @level: expected level, mandatory check
- * @first_key: expected key of first slot, skip check if NULL
- */
- static int btree_read_extent_buffer_pages(struct extent_buffer *eb,
- u64 parent_transid, int level,
- struct btrfs_key *first_key)
- {
- struct btrfs_fs_info *fs_info = eb->fs_info;
- struct extent_io_tree *io_tree;
- int failed = 0;
- int ret;
- int num_copies = 0;
- int mirror_num = 0;
- int failed_mirror = 0;
- io_tree = &BTRFS_I(fs_info->btree_inode)->io_tree;
- while (1) {
- clear_bit(EXTENT_BUFFER_CORRUPT, &eb->bflags);
- ret = read_extent_buffer_pages(eb, WAIT_COMPLETE, mirror_num);
- if (!ret) {
- if (verify_parent_transid(io_tree, eb,
- parent_transid, 0))
- ret = -EIO;
- else if (btrfs_verify_level_key(eb, level,
- first_key, parent_transid))
- ret = -EUCLEAN;
- else
- break;
- }
- num_copies = btrfs_num_copies(fs_info,
- eb->start, eb->len);
- if (num_copies == 1)
- break;
- if (!failed_mirror) {
- failed = 1;
- failed_mirror = eb->read_mirror;
- }
- mirror_num++;
- if (mirror_num == failed_mirror)
- mirror_num++;
- if (mirror_num > num_copies)
- break;
- }
- if (failed && !ret && failed_mirror)
- btrfs_repair_eb_io_failure(eb, failed_mirror);
- 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
- */
- static int csum_dirty_buffer(struct btrfs_fs_info *fs_info, struct page *page)
- {
- u64 start = page_offset(page);
- u64 found_start;
- u8 result[BTRFS_CSUM_SIZE];
- u16 csum_size = btrfs_super_csum_size(fs_info->super_copy);
- struct extent_buffer *eb;
- int ret;
- eb = (struct extent_buffer *)page->private;
- if (page != eb->pages[0])
- return 0;
- found_start = btrfs_header_bytenr(eb);
- /*
- * 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;
- ASSERT(memcmp_extent_buffer(eb, fs_info->fs_devices->metadata_uuid,
- btrfs_header_fsid(), BTRFS_FSID_SIZE) == 0);
- if (csum_tree_block(eb, result))
- return -EINVAL;
- if (btrfs_header_level(eb))
- ret = btrfs_check_node(eb);
- else
- ret = btrfs_check_leaf_full(eb);
- if (ret < 0) {
- btrfs_err(fs_info,
- "block=%llu write time tree block corruption detected",
- eb->start);
- return ret;
- }
- write_extent_buffer(eb, result, 0, csum_size);
- return 0;
- }
- 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;
- u8 fsid[BTRFS_FSID_SIZE];
- int ret = 1;
- read_extent_buffer(eb, fsid, btrfs_header_fsid(), BTRFS_FSID_SIZE);
- while (fs_devices) {
- u8 *metadata_uuid;
- /*
- * 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 (fs_devices == fs_info->fs_devices &&
- 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)) {
- ret = 0;
- break;
- }
- fs_devices = fs_devices->seed;
- }
- return ret;
- }
- static int btree_readpage_end_io_hook(struct btrfs_io_bio *io_bio,
- u64 phy_offset, struct page *page,
- u64 start, u64 end, int mirror)
- {
- u64 found_start;
- int found_level;
- struct extent_buffer *eb;
- struct btrfs_root *root = BTRFS_I(page->mapping->host)->root;
- struct btrfs_fs_info *fs_info = root->fs_info;
- u16 csum_size = btrfs_super_csum_size(fs_info->super_copy);
- int ret = 0;
- u8 result[BTRFS_CSUM_SIZE];
- int reads_done;
- if (!page->private)
- goto out;
- 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
- */
- extent_buffer_get(eb);
- 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;
- }
- 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 err;
- }
- if (check_tree_block_fsid(eb)) {
- btrfs_err_rl(fs_info, "bad fsid on block %llu",
- eb->start);
- ret = -EIO;
- goto err;
- }
- 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 err;
- }
- btrfs_set_buffer_lockdep_class(btrfs_header_owner(eb),
- eb, found_level);
- ret = csum_tree_block(eb, result);
- if (ret)
- goto err;
- if (memcmp_extent_buffer(eb, result, 0, csum_size)) {
- u8 val[BTRFS_CSUM_SIZE] = { 0 };
- read_extent_buffer(eb, &val, 0, csum_size);
- btrfs_warn_rl(fs_info,
- "%s checksum verify failed on %llu wanted " CSUM_FMT " found " CSUM_FMT " level %d",
- fs_info->sb->s_id, eb->start,
- CSUM_FMT_VALUE(csum_size, val),
- CSUM_FMT_VALUE(csum_size, result),
- btrfs_header_level(eb));
- ret = -EUCLEAN;
- goto err;
- }
- /*
- * If this is a leaf block and it is corrupt, set the corrupt bit so
- * that we don't try and read the other copies of this block, just
- * return -EIO.
- */
- if (found_level == 0 && 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);
- err:
- if (reads_done &&
- test_and_clear_bit(EXTENT_BUFFER_READAHEAD, &eb->bflags))
- btree_readahead_hook(eb, ret);
- 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);
- out:
- 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 (bio_op(bio) == REQ_OP_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 (unlikely(end_io_wq->metadata == BTRFS_WQ_ENDIO_DIO_REPAIR))
- wq = fs_info->endio_repair_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->private_data, async->bio,
- async->bio_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->private_data;
- /* 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;
- }
- ret = btrfs_map_bio(btrfs_sb(inode->i_sb), async->bio,
- async->mirror_num, 1);
- 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 btrfs_fs_info *fs_info, struct bio *bio,
- int mirror_num, unsigned long bio_flags,
- u64 bio_offset, void *private_data,
- extent_submit_bio_start_t *submit_bio_start)
- {
- struct async_submit_bio *async;
- async = kmalloc(sizeof(*async), GFP_NOFS);
- if (!async)
- return BLK_STS_RESOURCE;
- async->private_data = private_data;
- 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->bio_offset = bio_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->bv_page);
- if (ret)
- break;
- }
- return errno_to_blk_status(ret);
- }
- static blk_status_t btree_submit_bio_start(void *private_data, struct bio *bio,
- u64 bio_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 int check_async_write(struct btrfs_fs_info *fs_info,
- struct btrfs_inode *bi)
- {
- if (atomic_read(&bi->sync_writers))
- return 0;
- if (test_bit(BTRFS_FS_CSUM_IMPL_FAST, &fs_info->flags))
- return 0;
- return 1;
- }
- static blk_status_t btree_submit_bio_hook(struct inode *inode, struct bio *bio,
- int mirror_num,
- unsigned long bio_flags)
- {
- struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
- int async = check_async_write(fs_info, BTRFS_I(inode));
- blk_status_t ret;
- if (bio_op(bio) != REQ_OP_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, 0);
- } else if (!async) {
- ret = btree_csum_one_bio(bio);
- if (ret)
- goto out_w_error;
- ret = btrfs_map_bio(fs_info, bio, mirror_num, 0);
- } else {
- /*
- * kthread helpers are used to submit writes so that
- * checksumming can happen in parallel across all CPUs
- */
- ret = btrfs_wq_submit_bio(fs_info, bio, mirror_num, 0,
- 0, inode, 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_readpage(struct file *file, struct page *page)
- {
- struct extent_io_tree *tree;
- tree = &BTRFS_I(page->mapping->host)->io_tree;
- return extent_read_full_page(tree, page, btree_get_extent, 0);
- }
- 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));
- ClearPagePrivate(page);
- set_page_private(page, 0);
- put_page(page);
- }
- }
- static int btree_set_page_dirty(struct page *page)
- {
- #ifdef DEBUG
- struct extent_buffer *eb;
- BUG_ON(!PagePrivate(page));
- eb = (struct extent_buffer *)page->private;
- BUG_ON(!eb);
- BUG_ON(!test_bit(EXTENT_BUFFER_DIRTY, &eb->bflags));
- BUG_ON(!atomic_read(&eb->refs));
- btrfs_assert_tree_locked(eb);
- #endif
- return __set_page_dirty_nobuffers(page);
- }
- static const struct address_space_operations btree_aops = {
- .readpage = btree_readpage,
- .writepages = btree_writepages,
- .releasepage = btree_releasepage,
- .invalidatepage = btree_invalidatepage,
- #ifdef CONFIG_MIGRATION
- .migratepage = btree_migratepage,
- #endif
- .set_page_dirty = btree_set_page_dirty,
- };
- void readahead_tree_block(struct btrfs_fs_info *fs_info, u64 bytenr)
- {
- struct extent_buffer *buf = NULL;
- int ret;
- buf = btrfs_find_create_tree_block(fs_info, bytenr);
- if (IS_ERR(buf))
- return;
- ret = read_extent_buffer_pages(buf, WAIT_NONE, 0);
- if (ret < 0)
- free_extent_buffer_stale(buf);
- else
- free_extent_buffer(buf);
- }
- struct extent_buffer *btrfs_find_create_tree_block(
- struct btrfs_fs_info *fs_info,
- u64 bytenr)
- {
- if (btrfs_is_testing(fs_info))
- return alloc_test_extent_buffer(fs_info, bytenr);
- return alloc_extent_buffer(fs_info, bytenr);
- }
- /*
- * Read tree block at logical address @bytenr and do variant basic but critical
- * verification.
- *
- * @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 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);
- 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_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);
- /* ugh, clear_extent_buffer_dirty needs to lock the page */
- btrfs_set_lock_blocking_write(buf);
- clear_extent_buffer_dirty(buf);
- }
- }
- }
- static struct btrfs_subvolume_writers *btrfs_alloc_subvolume_writers(void)
- {
- struct btrfs_subvolume_writers *writers;
- int ret;
- writers = kmalloc(sizeof(*writers), GFP_NOFS);
- if (!writers)
- return ERR_PTR(-ENOMEM);
- ret = percpu_counter_init(&writers->counter, 0, GFP_NOFS);
- if (ret < 0) {
- kfree(writers);
- return ERR_PTR(ret);
- }
- init_waitqueue_head(&writers->wait);
- return writers;
- }
- static void
- btrfs_free_subvolume_writers(struct btrfs_subvolume_writers *writers)
- {
- percpu_counter_destroy(&writers->counter);
- kfree(writers);
- }
- 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);
- root->node = NULL;
- root->commit_root = NULL;
- root->state = 0;
- root->orphan_cleanup_state = 0;
- root->last_trans = 0;
- root->highest_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);
- root->block_rsv = NULL;
- 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->will_be_snapshotted, 0);
- 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;
- if (!dummy)
- extent_io_tree_init(fs_info, &root->dirty_log_pages,
- IO_TREE_ROOT_DIRTY_LOG_PAGES, NULL);
- 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));
- if (!dummy)
- root->defrag_trans_start = fs_info->generation;
- else
- root->defrag_trans_start = 0;
- root->root_key.objectid = objectid;
- root->anon_dev = 0;
- spin_lock_init(&root->root_item_lock);
- btrfs_qgroup_init_swapped_blocks(&root->swapped_blocks);
- }
- static struct btrfs_root *btrfs_alloc_root(struct btrfs_fs_info *fs_info,
- gfp_t flags)
- {
- struct btrfs_root *root = kzalloc(sizeof(*root), flags);
- if (root)
- root->fs_info = fs_info;
- 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, GFP_KERNEL);
- if (!root)
- return ERR_PTR(-ENOMEM);
- /* We don't use the stripesize in selftest, set it as sectorsize */
- __setup_root(root, fs_info, BTRFS_ROOT_TREE_OBJECTID);
- root->alloc_bytenr = 0;
- return root;
- }
- #endif
- 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;
- uuid_le uuid = NULL_UUID_LE;
- /*
- * 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, GFP_KERNEL);
- memalloc_nofs_restore(nofs_flag);
- if (!root)
- return ERR_PTR(-ENOMEM);
- __setup_root(root, fs_info, objectid);
- 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);
- if (IS_ERR(leaf)) {
- ret = PTR_ERR(leaf);
- leaf = NULL;
- goto fail;
- }
- root->node = leaf;
- btrfs_mark_buffer_dirty(leaf);
- root->commit_root = btrfs_root_node(root);
- set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
- root->root_item.flags = 0;
- root->root_item.byte_limit = 0;
- btrfs_set_root_bytenr(&root->root_item, leaf->start);
- btrfs_set_root_generation(&root->root_item, trans->transid);
- btrfs_set_root_level(&root->root_item, 0);
- btrfs_set_root_refs(&root->root_item, 1);
- btrfs_set_root_used(&root->root_item, leaf->len);
- btrfs_set_root_last_snapshot(&root->root_item, 0);
- btrfs_set_root_dirid(&root->root_item, 0);
- if (is_fstree(objectid))
- uuid_le_gen(&uuid);
- memcpy(root->root_item.uuid, uuid.b, BTRFS_UUID_SIZE);
- root->root_item.drop_level = 0;
- key.objectid = objectid;
- key.type = BTRFS_ROOT_ITEM_KEY;
- key.offset = 0;
- ret = btrfs_insert_root(trans, tree_root, &key, &root->root_item);
- if (ret)
- goto fail;
- btrfs_tree_unlock(leaf);
- return root;
- fail:
- if (leaf) {
- btrfs_tree_unlock(leaf);
- free_extent_buffer(root->commit_root);
- free_extent_buffer(leaf);
- }
- kfree(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;
- struct extent_buffer *leaf;
- root = btrfs_alloc_root(fs_info, GFP_NOFS);
- if (!root)
- return ERR_PTR(-ENOMEM);
- __setup_root(root, fs_info, BTRFS_TREE_LOG_OBJECTID);
- root->root_key.objectid = BTRFS_TREE_LOG_OBJECTID;
- root->root_key.type = BTRFS_ROOT_ITEM_KEY;
- root->root_key.offset = BTRFS_TREE_LOG_OBJECTID;
- /*
- * DON'T set REF_COWS for log trees
- *
- * log trees do not get reference counted because they go away
- * before a real commit is actually done. They do store pointers
- * to file data extents, and those reference counts still get
- * updated (along with back refs to the log tree).
- */
- leaf = btrfs_alloc_tree_block(trans, root, 0, BTRFS_TREE_LOG_OBJECTID,
- NULL, 0, 0, 0);
- if (IS_ERR(leaf)) {
- kfree(root);
- return ERR_CAST(leaf);
- }
- root->node = leaf;
- btrfs_mark_buffer_dirty(root->node);
- btrfs_tree_unlock(root->node);
- return root;
- }
- int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans,
- struct btrfs_fs_info *fs_info)
- {
- struct btrfs_root *log_root;
- log_root = alloc_log_tree(trans, fs_info);
- if (IS_ERR(log_root))
- return PTR_ERR(log_root);
- WARN_ON(fs_info->log_root_tree);
- fs_info->log_root_tree = log_root;
- return 0;
- }
- int btrfs_add_log_tree(struct btrfs_trans_handle *trans,
- struct btrfs_root *root)
- {
- struct btrfs_fs_info *fs_info = root->fs_info;
- struct btrfs_root *log_root;
- struct btrfs_inode_item *inode_item;
- log_root = alloc_log_tree(trans, fs_info);
- if (IS_ERR(log_root))
- return PTR_ERR(log_root);
- log_root->last_trans = trans->transid;
- log_root->root_key.offset = root->root_key.objectid;
- inode_item = &log_root->root_item.inode;
- 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 *btrfs_read_tree_root(struct btrfs_root *tree_root,
- struct btrfs_key *key)
- {
- struct btrfs_root *root;
- struct btrfs_fs_info *fs_info = tree_root->fs_info;
- struct btrfs_path *path;
- u64 generation;
- int ret;
- int level;
- path = btrfs_alloc_path();
- if (!path)
- return ERR_PTR(-ENOMEM);
- root = btrfs_alloc_root(fs_info, GFP_NOFS);
- if (!root) {
- ret = -ENOMEM;
- goto alloc_fail;
- }
- __setup_root(root, fs_info, key->objectid);
- ret = btrfs_find_root(tree_root, key, path,
- &root->root_item, &root->root_key);
- if (ret) {
- if (ret > 0)
- ret = -ENOENT;
- goto find_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),
- generation, level, NULL);
- if (IS_ERR(root->node)) {
- ret = PTR_ERR(root->node);
- goto find_fail;
- } else if (!btrfs_buffer_uptodate(root->node, generation, 0)) {
- ret = -EIO;
- free_extent_buffer(root->node);
- goto find_fail;
- }
- root->commit_root = btrfs_root_node(root);
- out:
- btrfs_free_path(path);
- return root;
- find_fail:
- kfree(root);
- alloc_fail:
- root = ERR_PTR(ret);
- goto out;
- }
- struct btrfs_root *btrfs_read_fs_root(struct btrfs_root *tree_root,
- struct btrfs_key *location)
- {
- struct btrfs_root *root;
- root = btrfs_read_tree_root(tree_root, location);
- if (IS_ERR(root))
- return root;
- if (root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) {
- set_bit(BTRFS_ROOT_REF_COWS, &root->state);
- btrfs_check_and_init_root_item(&root->root_item);
- }
- return root;
- }
- int btrfs_init_fs_root(struct btrfs_root *root)
- {
- int ret;
- struct btrfs_subvolume_writers *writers;
- root->free_ino_ctl = kzalloc(sizeof(*root->free_ino_ctl), GFP_NOFS);
- root->free_ino_pinned = kzalloc(sizeof(*root->free_ino_pinned),
- GFP_NOFS);
- if (!root->free_ino_pinned || !root->free_ino_ctl) {
- ret = -ENOMEM;
- goto fail;
- }
- writers = btrfs_alloc_subvolume_writers();
- if (IS_ERR(writers)) {
- ret = PTR_ERR(writers);
- goto fail;
- }
- root->subv_writers = writers;
- btrfs_init_free_ino_ctl(root);
- spin_lock_init(&root->ino_cache_lock);
- init_waitqueue_head(&root->ino_cache_wait);
- /*
- * 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) {
- ret = get_anon_bdev(&root->anon_dev);
- if (ret)
- goto fail;
- }
- mutex_lock(&root->objectid_mutex);
- ret = btrfs_find_highest_objectid(root,
- &root->highest_objectid);
- if (ret) {
- mutex_unlock(&root->objectid_mutex);
- goto fail;
- }
- ASSERT(root->highest_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;
- }
- 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);
- spin_unlock(&fs_info->fs_roots_radix_lock);
- return root;
- }
- int btrfs_insert_fs_root(struct btrfs_fs_info *fs_info,
- struct btrfs_root *root)
- {
- int ret;
- ret = radix_tree_preload(GFP_NOFS);
- 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)
- set_bit(BTRFS_ROOT_IN_RADIX, &root->state);
- spin_unlock(&fs_info->fs_roots_radix_lock);
- radix_tree_preload_end();
- return ret;
- }
- struct btrfs_root *btrfs_get_fs_root(struct btrfs_fs_info *fs_info,
- struct btrfs_key *location,
- bool check_ref)
- {
- struct btrfs_root *root;
- struct btrfs_path *path;
- struct btrfs_key key;
- int ret;
- if (location->objectid == BTRFS_ROOT_TREE_OBJECTID)
- return fs_info->tree_root;
- if (location->objectid == BTRFS_EXTENT_TREE_OBJECTID)
- return fs_info->extent_root;
- if (location->objectid == BTRFS_CHUNK_TREE_OBJECTID)
- return fs_info->chunk_root;
- if (location->objectid == BTRFS_DEV_TREE_OBJECTID)
- return fs_info->dev_root;
- if (location->objectid == BTRFS_CSUM_TREE_OBJECTID)
- return fs_info->csum_root;
- if (location->objectid == BTRFS_QUOTA_TREE_OBJECTID)
- return fs_info->quota_root ? fs_info->quota_root :
- ERR_PTR(-ENOENT);
- if (location->objectid == BTRFS_UUID_TREE_OBJECTID)
- return fs_info->uuid_root ? fs_info->uuid_root :
- ERR_PTR(-ENOENT);
- if (location->objectid == BTRFS_FREE_SPACE_TREE_OBJECTID)
- return fs_info->free_space_root ? fs_info->free_space_root :
- ERR_PTR(-ENOENT);
- again:
- root = btrfs_lookup_fs_root(fs_info, location->objectid);
- if (root) {
- if (check_ref && btrfs_root_refs(&root->root_item) == 0)
- return ERR_PTR(-ENOENT);
- return root;
- }
- root = btrfs_read_fs_root(fs_info->tree_root, location);
- 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);
- 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 = location->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) {
- if (ret == -EEXIST) {
- btrfs_free_fs_root(root);
- goto again;
- }
- goto fail;
- }
- return root;
- fail:
- btrfs_free_fs_root(root);
- return ERR_PTR(ret);
- }
- static int btrfs_congested_fn(void *congested_data, int bdi_bits)
- {
- struct btrfs_fs_info *info = (struct btrfs_fs_info *)congested_data;
- int ret = 0;
- struct btrfs_device *device;
- struct backing_dev_info *bdi;
- rcu_read_lock();
- list_for_each_entry_rcu(device, &info->fs_devices->devices, dev_list) {
- if (!device->bdev)
- continue;
- bdi = device->bdev->bd_bdi;
- if (bdi_congested(bdi, bdi_bits)) {
- ret = 1;
- break;
- }
- }
- rcu_read_unlock();
- return ret;
- }
- /*
- * 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->delete_unused_bgs_mutex to avoid racing
- * with relocation (btrfs_relocate_chunk) and relocation
- * acquires fs_info->cleaner_mutex (btrfs_relocate_block_group)
- * after acquiring fs_info->delete_unused_bgs_mutex. So we
- * can't hold, nor need to, fs_info->cleaner_mutex when deleting
- * unused block groups.
- */
- btrfs_delete_unused_bgs(fs_info);
- sleep:
- clear_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 now;
- unsigned long delay;
- bool cannot_commit;
- do {
- cannot_commit = false;
- delay = HZ * fs_info->commit_interval;
- 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;
- }
- now = ktime_get_seconds();
- if (cur->state < TRANS_STATE_COMMIT_START &&
- (now < cur->start_time ||
- now - cur->start_time < fs_info->commit_interval)) {
- spin_unlock(&fs_info->trans_lock);
- delay = HZ * 5;
- 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 (unlikely(test_bit(BTRFS_FS_STATE_ERROR,
- &fs_info->fs_state)))
- 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 -1 if we can't find anything.
- *
- * We check to make sure the array is valid by comparing the
- * generation of the latest root in the array with the generation
- * in the super block. If they don't match we pitch it.
- */
- static int find_newest_super_backup(struct btrfs_fs_info *info, u64 newest_gen)
- {
- u64 cur;
- int newest_index = -1;
- struct btrfs_root_backup *root_backup;
- int i;
- for (i = 0; i < BTRFS_NUM_BACKUP_ROOTS; i++) {
- root_backup = info->super_copy->super_roots + i;
- cur = btrfs_backup_tree_root_gen(root_backup);
- if (cur == newest_gen)
- newest_index = i;
- }
- /* check to see if we actually wrapped around */
- if (newest_index == BTRFS_NUM_BACKUP_ROOTS - 1) {
- root_backup = info->super_copy->super_roots;
- cur = btrfs_backup_tree_root_gen(root_backup);
- if (cur == newest_gen)
- newest_index = 0;
- }
- return newest_index;
- }
- /*
- * find the oldest backup so we know where to store new entries
- * in the backup array. This will set the backup_root_index
- * field in the fs_info struct
- */
- static void find_oldest_super_backup(struct btrfs_fs_info *info,
- u64 newest_gen)
- {
- int newest_index = -1;
- newest_index = find_newest_super_backup(info, newest_gen);
- /* if there was garbage in there, just move along */
- if (newest_index == -1) {
- info->backup_root_index = 0;
- } else {
- info->backup_root_index = (newest_index + 1) % BTRFS_NUM_BACKUP_ROOTS;
- }
- }
- /*
- * copy all the root pointers into the super backup array.
- * this will bump the backup pointer by one when it is
- * done
- */
- static void backup_super_roots(struct btrfs_fs_info *info)
- {
- int next_backup;
- struct btrfs_root_backup *root_backup;
- int last_backup;
- next_backup = info->backup_root_index;
- last_backup = (next_backup + BTRFS_NUM_BACKUP_ROOTS - 1) %
- BTRFS_NUM_BACKUP_ROOTS;
- /*
- * just overwrite the last backup if we're at the same generation
- * this happens only at umount
- */
- root_backup = info->super_for_commit->super_roots + last_backup;
- if (btrfs_backup_tree_root_gen(root_backup) ==
- btrfs_header_generation(info->tree_root->node))
- next_backup = last_backup;
- root_backup = info->super_for_commit->super_roots + next_backup;
- /*
- * make sure all of our padding and empty slots get zero filled
- * regardless of which ones we use today
- */
- memset(root_backup, 0, sizeof(*root_backup));
- info->backup_root_index = (next_backup + 1) % BTRFS_NUM_BACKUP_ROOTS;
- btrfs_set_backup_tree_root(root_backup, info->tree_root->node->start);
- btrfs_set_backup_tree_root_gen(root_backup,
- btrfs_header_generation(info->tree_root->node));
- btrfs_set_backup_tree_root_level(root_backup,
- btrfs_header_level(info->tree_root->node));
- btrfs_set_backup_chunk_root(root_backup, info->chunk_root->node->start);
- btrfs_set_backup_chunk_root_gen(root_backup,
- btrfs_header_generation(info->chunk_root->node));
- btrfs_set_backup_chunk_root_level(root_backup,
- btrfs_header_level(info->chunk_root->node));
- btrfs_set_backup_extent_root(root_backup, info->extent_root->node->start);
- btrfs_set_backup_extent_root_gen(root_backup,
- btrfs_header_generation(info->extent_root->node));
- btrfs_set_backup_extent_root_level(root_backup,
- btrfs_header_level(info->extent_root->node));
- /*
- * 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, info->csum_root->node->start);
- btrfs_set_backup_csum_root_gen(root_backup,
- btrfs_header_generation(info->csum_root->node));
- btrfs_set_backup_csum_root_level(root_backup,
- btrfs_header_level(info->csum_root->node));
- btrfs_set_backup_total_bytes(root_backup,
- btrfs_super_total_bytes(info->super_copy));
- btrfs_set_backup_bytes_used(root_backup,
- btrfs_super_bytes_used(info->super_copy));
- btrfs_set_backup_num_devices(root_backup,
- btrfs_super_num_devices(info->super_copy));
- /*
- * if we don't copy this out to the super_copy, it won't get remembered
- * for the next commit
- */
- memcpy(&info->super_copy->super_roots,
- &info->super_for_commit->super_roots,
- sizeof(*root_backup) * BTRFS_NUM_BACKUP_ROOTS);
- }
- /*
- * this copies info out of the root backup array and back into
- * the in-memory super block. It is meant to help iterate through
- * the array, so you send it the number of backups you've already
- * tried and the last backup index you used.
- *
- * this returns -1 when it has tried all the backups
- */
- static noinline int next_root_backup(struct btrfs_fs_info *info,
- struct btrfs_super_block *super,
- int *num_backups_tried, int *backup_index)
- {
- struct btrfs_root_backup *root_backup;
- int newest = *backup_index;
- if (*num_backups_tried == 0) {
- u64 gen = btrfs_super_generation(super);
- newest = find_newest_super_backup(info, gen);
- if (newest == -1)
- return -1;
- *backup_index = newest;
- *num_backups_tried = 1;
- } else if (*num_backups_tried == BTRFS_NUM_BACKUP_ROOTS) {
- /* we've tried all the backups, all done */
- return -1;
- } else {
- /* jump to the next oldest backup */
- newest = (*backup_index + BTRFS_NUM_BACKUP_ROOTS - 1) %
- BTRFS_NUM_BACKUP_ROOTS;
- *backup_index = newest;
- *num_backups_tried += 1;
- }
- root_backup = super->super_roots + newest;
- btrfs_set_super_generation(super,
- btrfs_backup_tree_root_gen(root_backup));
- btrfs_set_super_root(super, btrfs_backup_tree_root(root_backup));
- btrfs_set_super_root_level(super,
- btrfs_backup_tree_root_level(root_backup));
- btrfs_set_super_bytes_used(super, btrfs_backup_bytes_used(root_backup));
- /*
- * fixme: the total bytes and num_devices need to match or we should
- * need a fsck
- */
- btrfs_set_super_total_bytes(super, btrfs_backup_total_bytes(root_backup));
- btrfs_set_super_num_devices(super, btrfs_backup_num_devices(root_backup));
- return 0;
- }
- /* 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->endio_repair_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->submit_workers);
- btrfs_destroy_workqueue(fs_info->delayed_workers);
- btrfs_destroy_workqueue(fs_info->caching_workers);
- btrfs_destroy_workqueue(fs_info->readahead_workers);
- btrfs_destroy_workqueue(fs_info->flush_workers);
- btrfs_destroy_workqueue(fs_info->qgroup_rescan_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;
- }
- }
- /* 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_root_extent_buffers(info->dev_root);
- free_root_extent_buffers(info->extent_root);
- free_root_extent_buffers(info->csum_root);
- free_root_extent_buffers(info->quota_root);
- free_root_extent_buffers(info->uuid_root);
- if (free_chunk_root)
- free_root_extent_buffers(info->chunk_root);
- free_root_extent_buffers(info->free_space_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]);
- } else {
- free_extent_buffer(gang[0]->node);
- free_extent_buffer(gang[0]->commit_root);
- btrfs_put_fs_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]);
- }
- if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state)) {
- btrfs_free_log_root_tree(NULL, fs_info);
- btrfs_destroy_pinned_extent(fs_info, fs_info->pinned_extents);
- }
- }
- 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);
- }
- 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_INODE_IO, inode);
- BTRFS_I(inode)->io_tree.track_uptodate = false;
- extent_map_tree_init(&BTRFS_I(inode)->extent_tree);
- BTRFS_I(inode)->io_tree.ops = &btree_extent_io_ops;
- BTRFS_I(inode)->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,
- struct btrfs_fs_devices *fs_devices)
- {
- 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);
- /*
- * a higher idle thresh on the submit workers makes it much more
- * likely that bios will be send down in a sane order to the
- * devices
- */
- fs_info->submit_workers =
- btrfs_alloc_workqueue(fs_info, "submit", flags,
- min_t(u64, fs_devices->num_devices,
- max_active), 64);
- 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->endio_repair_workers =
- btrfs_alloc_workqueue(fs_info, "endio-repair", flags, 1, 0);
- 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->readahead_workers =
- btrfs_alloc_workqueue(fs_info, "readahead", flags,
- max_active, 2);
- fs_info->qgroup_rescan_workers =
- btrfs_alloc_workqueue(fs_info, "qgroup-rescan", flags, 1, 0);
- if (!(fs_info->workers && fs_info->delalloc_workers &&
- fs_info->submit_workers && fs_info->flush_workers &&
- fs_info->endio_workers && fs_info->endio_meta_workers &&
- fs_info->endio_meta_write_workers &&
- fs_info->endio_repair_workers &&
- fs_info->endio_write_workers && fs_info->endio_raid56_workers &&
- fs_info->endio_freespace_worker && fs_info->rmw_workers &&
- fs_info->caching_workers && fs_info->readahead_workers &&
- fs_info->fixup_workers && fs_info->delayed_workers &&
- fs_info->qgroup_rescan_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_name = btrfs_super_csum_name(csum_type);
- csum_shash = crypto_alloc_shash(csum_name, 0, 0);
- if (IS_ERR(csum_shash)) {
- btrfs_err(fs_info, "error allocating %s hash for checksum",
- csum_name);
- return PTR_ERR(csum_shash);
- }
- fs_info->csum_shash = csum_shash;
- return 0;
- }
- static void btrfs_free_csum_hash(struct btrfs_fs_info *fs_info)
- {
- crypto_free_shash(fs_info->csum_shash);
- }
- 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, GFP_KERNEL);
- if (!log_tree_root)
- return -ENOMEM;
- __setup_root(log_tree_root, fs_info, BTRFS_TREE_LOG_OBJECTID);
- log_tree_root->node = read_tree_block(fs_info, bytenr,
- 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);
- kfree(log_tree_root);
- return ret;
- } else if (!extent_buffer_uptodate(log_tree_root->node)) {
- btrfs_err(fs_info, "failed to read log tree");
- free_extent_buffer(log_tree_root->node);
- kfree(log_tree_root);
- return -EIO;
- }
- /* returns with log_tree_root freed on success */
- ret = btrfs_recover_log_trees(log_tree_root);
- if (ret) {
- btrfs_handle_fs_error(fs_info, ret,
- "Failed to recover log tree");
- free_extent_buffer(log_tree_root->node);
- kfree(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 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);
- location.objectid = BTRFS_EXTENT_TREE_OBJECTID;
- location.type = BTRFS_ROOT_ITEM_KEY;
- location.offset = 0;
- root = btrfs_read_tree_root(tree_root, &location);
- if (IS_ERR(root)) {
- ret = PTR_ERR(root);
- goto out;
- }
- set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
- fs_info->extent_root = root;
- location.objectid = BTRFS_DEV_TREE_OBJECTID;
- root = btrfs_read_tree_root(tree_root, &location);
- if (IS_ERR(root)) {
- ret = PTR_ERR(root);
- goto out;
- }
- set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
- fs_info->dev_root = root;
- btrfs_init_devices_late(fs_info);
- location.objectid = BTRFS_CSUM_TREE_OBJECTID;
- root = btrfs_read_tree_root(tree_root, &location);
- if (IS_ERR(root)) {
- ret = PTR_ERR(root);
- goto out;
- }
- set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
- fs_info->csum_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)) {
- ret = PTR_ERR(root);
- if (ret != -ENOENT)
- goto out;
- } else {
- set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
- fs_info->uuid_root = root;
- }
- if (btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE)) {
- location.objectid = BTRFS_FREE_SPACE_TREE_OBJECTID;
- root = btrfs_read_tree_root(tree_root, &location);
- if (IS_ERR(root)) {
- ret = PTR_ERR(root);
- goto out;
- }
- set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
- fs_info->free_space_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;
- }
- /* Only PAGE SIZE is supported yet */
- if (sectorsize != PAGE_SIZE) {
- btrfs_err(fs_info,
- "sectorsize %llu not supported yet, only support %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;
- }
- int 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_key location;
- struct buffer_head *bh;
- 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 num_backups_tried = 0;
- int backup_index = 0;
- int clear_free_space_tree = 0;
- int level;
- tree_root = fs_info->tree_root = btrfs_alloc_root(fs_info, GFP_KERNEL);
- chunk_root = fs_info->chunk_root = btrfs_alloc_root(fs_info, GFP_KERNEL);
- if (!tree_root || !chunk_root) {
- err = -ENOMEM;
- goto fail;
- }
- ret = init_srcu_struct(&fs_info->subvol_srcu);
- if (ret) {
- err = ret;
- goto fail;
- }
- ret = percpu_counter_init(&fs_info->dio_bytes, 0, GFP_KERNEL);
- if (ret) {
- err = ret;
- goto fail_srcu;
- }
- ret = percpu_counter_init(&fs_info->dirty_metadata_bytes, 0, GFP_KERNEL);
- if (ret) {
- err = ret;
- goto fail_dio_bytes;
- }
- 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) {
- err = ret;
- goto fail_dirty_metadata_bytes;
- }
- ret = percpu_counter_init(&fs_info->dev_replace.bio_counter, 0,
- GFP_KERNEL);
- if (ret) {
- err = ret;
- goto fail_delalloc_bytes;
- }
- 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);
- rwlock_init(&fs_info->tree_mod_log_lock);
- mutex_init(&fs_info->unused_bg_unpin_mutex);
- mutex_init(&fs_info->delete_unused_bgs_mutex);
- mutex_init(&fs_info->reloc_mutex);
- mutex_init(&fs_info->delalloc_root_mutex);
- 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);
- 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->reada_works_cnt, 0);
- atomic_set(&fs_info->nr_delayed_iputs, 0);
- atomic64_set(&fs_info->tree_mod_seq, 0);
- fs_info->sb = sb;
- 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 */
- /* readahead state */
- INIT_RADIX_TREE(&fs_info->reada_tree, GFP_NOFS & ~__GFP_DIRECT_RECLAIM);
- spin_lock_init(&fs_info->reada_lock);
- 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);
- fs_info->btree_inode = new_inode(sb);
- if (!fs_info->btree_inode) {
- err = -ENOMEM;
- goto fail_bio_counter;
- }
- mapping_set_gfp_mask(fs_info->btree_inode->i_mapping, GFP_NOFS);
- fs_info->delayed_root = kmalloc(sizeof(struct btrfs_delayed_root),
- GFP_KERNEL);
- if (!fs_info->delayed_root) {
- err = -ENOMEM;
- goto fail_iput;
- }
- btrfs_init_delayed_root(fs_info->delayed_root);
- 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->async_reclaim_work);
- sb->s_blocksize = BTRFS_BDEV_BLOCKSIZE;
- sb->s_blocksize_bits = blksize_bits(BTRFS_BDEV_BLOCKSIZE);
- btrfs_init_btree_inode(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->freed_extents[0],
- IO_TREE_FS_INFO_FREED_EXTENTS0, NULL);
- extent_io_tree_init(fs_info, &fs_info->freed_extents[1],
- IO_TREE_FS_INFO_FREED_EXTENTS1, NULL);
- fs_info->pinned_extents = &fs_info->freed_extents[0];
- set_bit(BTRFS_FS_BARRIER, &fs_info->flags);
- 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_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->stripesize = 4096;
- spin_lock_init(&fs_info->swapfile_pins_lock);
- fs_info->swapfile_pins = RB_ROOT;
- fs_info->send_in_progress = 0;
- ret = btrfs_alloc_stripe_hash_table(fs_info);
- if (ret) {
- err = ret;
- goto fail_alloc;
- }
- __setup_root(tree_root, fs_info, BTRFS_ROOT_TREE_OBJECTID);
- invalidate_bdev(fs_devices->latest_bdev);
- /*
- * Read super block and check the signature bytes only
- */
- bh = btrfs_read_dev_super(fs_devices->latest_bdev);
- if (IS_ERR(bh)) {
- err = PTR_ERR(bh);
- 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((struct btrfs_super_block *)bh->b_data);
- if (!btrfs_supported_super_csum(csum_type)) {
- btrfs_err(fs_info, "unsupported checksum algorithm: %u",
- csum_type);
- err = -EINVAL;
- brelse(bh);
- goto fail_alloc;
- }
- ret = btrfs_init_csum_hash(fs_info, csum_type);
- if (ret) {
- err = ret;
- 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, bh->b_data)) {
- btrfs_err(fs_info, "superblock checksum mismatch");
- err = -EINVAL;
- brelse(bh);
- goto fail_csum;
- }
- /*
- * 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, bh->b_data, sizeof(*fs_info->super_copy));
- brelse(bh);
- 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_csum;
- }
- if (!btrfs_super_root(disk_super))
- goto fail_csum;
- /* 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);
- /*
- * run through our array of backup supers and setup
- * our ring pointer to the oldest one
- */
- generation = btrfs_super_generation(disk_super);
- find_oldest_super_backup(fs_info, generation);
- /*
- * 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));
- /* Cache block sizes */
- fs_info->nodesize = nodesize;
- fs_info->sectorsize = sectorsize;
- fs_info->stripesize = stripesize;
- ret = btrfs_parse_options(fs_info, options, sb->s_flags);
- if (ret) {
- err = ret;
- goto fail_csum;
- }
- 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_csum;
- }
- 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_csum;
- }
- /*
- * 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_csum;
- }
- ret = btrfs_init_workqueues(fs_info, fs_devices);
- if (ret) {
- err = ret;
- goto fail_sb_buffer;
- }
- sb->s_bdi->congested_fn = btrfs_congested_fn;
- sb->s_bdi->congested_data = fs_info;
- sb->s_bdi->capabilities |= BDI_CAP_CGROUP_WRITEBACK;
- sb->s_bdi->ra_pages = VM_READAHEAD_PAGES;
- 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);
- __setup_root(chunk_root, fs_info, BTRFS_CHUNK_TREE_OBJECTID);
- chunk_root->node = read_tree_block(fs_info,
- btrfs_super_chunk_root(disk_super),
- 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,
- btrfs_header_chunk_tree_uuid(chunk_root->node), 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;
- }
- /*
- * Keep the devid that is marked to be the target device for the
- * device replace procedure
- */
- btrfs_free_extra_devids(fs_devices, 0);
- if (!fs_devices->latest_bdev) {
- btrfs_err(fs_info, "failed to read devices");
- goto fail_tree_roots;
- }
- retry_root_backup:
- generation = btrfs_super_generation(disk_super);
- level = btrfs_super_root_level(disk_super);
- tree_root->node = read_tree_block(fs_info,
- btrfs_super_root(disk_super),
- generation, level, NULL);
- if (IS_ERR(tree_root->node) ||
- !extent_buffer_uptodate(tree_root->node)) {
- btrfs_warn(fs_info, "failed to read tree root");
- if (!IS_ERR(tree_root->node))
- free_extent_buffer(tree_root->node);
- tree_root->node = NULL;
- goto recovery_tree_root;
- }
- 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);
- mutex_lock(&tree_root->objectid_mutex);
- ret = btrfs_find_highest_objectid(tree_root,
- &tree_root->highest_objectid);
- if (ret) {
- mutex_unlock(&tree_root->objectid_mutex);
- goto recovery_tree_root;
- }
- ASSERT(tree_root->highest_objectid <= BTRFS_LAST_FREE_OBJECTID);
- mutex_unlock(&tree_root->objectid_mutex);
- ret = btrfs_read_roots(fs_info);
- if (ret)
- goto recovery_tree_root;
- fs_info->generation = generation;
- fs_info->last_trans_committed = generation;
- /*
- * 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;
- }
- btrfs_free_extra_devids(fs_devices, 1);
- ret = btrfs_sysfs_add_fsid(fs_devices, NULL);
- if (ret) {
- btrfs_err(fs_info, "failed to init sysfs fsid interface: %d",
- ret);
- goto fail_block_groups;
- }
- ret = btrfs_sysfs_add_device(fs_devices);
- if (ret) {
- btrfs_err(fs_info, "failed to init sysfs device interface: %d",
- ret);
- goto fail_fsdev_sysfs;
- }
- 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;
- }
- if (!sb_rdonly(sb) && !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_INCLUDING_EXTENT_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;
- }
- }
- ret = btrfs_find_orphan_roots(fs_info);
- if (ret)
- goto fail_qgroup;
- if (!sb_rdonly(sb)) {
- ret = btrfs_cleanup_fs_roots(fs_info);
- if (ret)
- goto fail_qgroup;
- mutex_lock(&fs_info->cleaner_mutex);
- ret = btrfs_recover_relocation(tree_root);
- mutex_unlock(&fs_info->cleaner_mutex);
- if (ret < 0) {
- btrfs_warn(fs_info, "failed to recover relocation: %d",
- ret);
- err = -EINVAL;
- goto fail_qgroup;
- }
- }
- location.objectid = BTRFS_FS_TREE_OBJECTID;
- location.type = BTRFS_ROOT_ITEM_KEY;
- location.offset = 0;
- fs_info->fs_root = btrfs_read_fs_root_no_name(fs_info, &location);
- 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))
- return 0;
- if (btrfs_test_opt(fs_info, CLEAR_CACHE) &&
- btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE)) {
- clear_free_space_tree = 1;
- } 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 = 1;
- }
- 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);
- close_ctree(fs_info);
- return ret;
- }
- }
- 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);
- close_ctree(fs_info);
- return ret;
- }
- }
- 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);
- close_ctree(fs_info);
- return ret;
- }
- up_read(&fs_info->cleanup_work_sem);
- ret = btrfs_resume_balance_async(fs_info);
- if (ret) {
- btrfs_warn(fs_info, "failed to resume balance: %d", ret);
- close_ctree(fs_info);
- return ret;
- }
- ret = btrfs_resume_dev_replace_async(fs_info);
- if (ret) {
- btrfs_warn(fs_info, "failed to resume device replace: %d", ret);
- close_ctree(fs_info);
- return ret;
- }
- 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);
- close_ctree(fs_info);
- return ret;
- }
- } else if (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);
- /*
- * backuproot only affect mount behavior, and if open_ctree succeeded,
- * no need to keep the flag
- */
- btrfs_clear_opt(fs_info->mount_opt, USEBACKUPROOT);
- 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:
- 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_csum:
- btrfs_free_csum_hash(fs_info);
- fail_alloc:
- fail_iput:
- btrfs_mapping_tree_free(&fs_info->mapping_tree);
- iput(fs_info->btree_inode);
- fail_bio_counter:
- percpu_counter_destroy(&fs_info->dev_replace.bio_counter);
- fail_delalloc_bytes:
- percpu_counter_destroy(&fs_info->delalloc_bytes);
- fail_dirty_metadata_bytes:
- percpu_counter_destroy(&fs_info->dirty_metadata_bytes);
- fail_dio_bytes:
- percpu_counter_destroy(&fs_info->dio_bytes);
- fail_srcu:
- cleanup_srcu_struct(&fs_info->subvol_srcu);
- fail:
- btrfs_free_stripe_hash_table(fs_info);
- btrfs_close_devices(fs_info->fs_devices);
- return err;
- recovery_tree_root:
- if (!btrfs_test_opt(fs_info, USEBACKUPROOT))
- goto fail_tree_roots;
- free_root_pointers(fs_info, false);
- /* don't use the log in recovery mode, it won't be valid */
- btrfs_set_super_log_root(disk_super, 0);
- /* we can't trust the free space cache either */
- btrfs_set_opt(fs_info->mount_opt, CLEAR_CACHE);
- ret = next_root_backup(fs_info, fs_info->super_copy,
- &num_backups_tried, &backup_index);
- if (ret == -1)
- goto fail_block_groups;
- goto retry_root_backup;
- }
- ALLOW_ERROR_INJECTION(open_ctree, ERRNO);
- static void btrfs_end_buffer_write_sync(struct buffer_head *bh, int uptodate)
- {
- if (uptodate) {
- set_buffer_uptodate(bh);
- } else {
- struct btrfs_device *device = (struct btrfs_device *)
- bh->b_private;
- btrfs_warn_rl_in_rcu(device->fs_info,
- "lost page write due to IO error on %s",
- rcu_str_deref(device->name));
- /* note, we don't set_buffer_write_io_error because we have
- * our own ways of dealing with the IO errors
- */
- clear_buffer_uptodate(bh);
- btrfs_dev_stat_inc_and_print(device, BTRFS_DEV_STAT_WRITE_ERRS);
- }
- unlock_buffer(bh);
- put_bh(bh);
- }
- int btrfs_read_dev_one_super(struct block_device *bdev, int copy_num,
- struct buffer_head **bh_ret)
- {
- struct buffer_head *bh;
- struct btrfs_super_block *super;
- u64 bytenr;
- bytenr = btrfs_sb_offset(copy_num);
- if (bytenr + BTRFS_SUPER_INFO_SIZE >= i_size_read(bdev->bd_inode))
- return -EINVAL;
- bh = __bread(bdev, bytenr / BTRFS_BDEV_BLOCKSIZE, BTRFS_SUPER_INFO_SIZE);
- /*
- * If we fail to read from the underlying devices, as of now
- * the best option we have is to mark it EIO.
- */
- if (!bh)
- return -EIO;
- super = (struct btrfs_super_block *)bh->b_data;
- if (btrfs_super_bytenr(super) != bytenr ||
- btrfs_super_magic(super) != BTRFS_MAGIC) {
- brelse(bh);
- return -EINVAL;
- }
- *bh_ret = bh;
- return 0;
- }
- struct buffer_head *btrfs_read_dev_super(struct block_device *bdev)
- {
- struct buffer_head *bh;
- struct buffer_head *latest = NULL;
- struct btrfs_super_block *super;
- int i;
- u64 transid = 0;
- int ret = -EINVAL;
- /* 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++) {
- ret = btrfs_read_dev_one_super(bdev, i, &bh);
- if (ret)
- continue;
- super = (struct btrfs_super_block *)bh->b_data;
- if (!latest || btrfs_super_generation(super) > transid) {
- brelse(latest);
- latest = bh;
- transid = btrfs_super_generation(super);
- } else {
- brelse(bh);
- }
- }
- if (!latest)
- return ERR_PTR(ret);
- return latest;
- }
- /*
- * Write superblock @sb to the @device. Do not wait for completion, all the
- * buffer heads we write are pinned.
- *
- * 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 buffer head 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;
- SHASH_DESC_ON_STACK(shash, fs_info->csum_shash);
- struct buffer_head *bh;
- int i;
- int ret;
- int errors = 0;
- u64 bytenr;
- int op_flags;
- if (max_mirrors == 0)
- max_mirrors = BTRFS_SUPER_MIRROR_MAX;
- shash->tfm = fs_info->csum_shash;
- for (i = 0; i < max_mirrors; i++) {
- bytenr = btrfs_sb_offset(i);
- if (bytenr + BTRFS_SUPER_INFO_SIZE >=
- device->commit_total_bytes)
- break;
- btrfs_set_super_bytenr(sb, bytenr);
- crypto_shash_init(shash);
- crypto_shash_update(shash, (const char *)sb + BTRFS_CSUM_SIZE,
- BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
- crypto_shash_final(shash, sb->csum);
- /* One reference for us, and we leave it for the caller */
- bh = __getblk(device->bdev, bytenr / BTRFS_BDEV_BLOCKSIZE,
- BTRFS_SUPER_INFO_SIZE);
- if (!bh) {
- btrfs_err(device->fs_info,
- "couldn't get super buffer head for bytenr %llu",
- bytenr);
- errors++;
- continue;
- }
- memcpy(bh->b_data, sb, BTRFS_SUPER_INFO_SIZE);
- /* one reference for submit_bh */
- get_bh(bh);
- set_buffer_uptodate(bh);
- lock_buffer(bh);
- bh->b_end_io = btrfs_end_buffer_write_sync;
- bh->b_private = device;
- /*
- * we fua the first super. The others we allow
- * to go down lazy.
- */
- op_flags = REQ_SYNC | REQ_META | REQ_PRIO;
- if (i == 0 && !btrfs_test_opt(device->fs_info, NOBARRIER))
- op_flags |= REQ_FUA;
- ret = btrfsic_submit_bh(REQ_OP_WRITE, op_flags, bh);
- if (ret)
- 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 buffer head is not found or not marked up to
- * date.
- */
- static int wait_dev_supers(struct btrfs_device *device, int max_mirrors)
- {
- struct buffer_head *bh;
- int i;
- int errors = 0;
- bool primary_failed = false;
- u64 bytenr;
- if (max_mirrors == 0)
- max_mirrors = BTRFS_SUPER_MIRROR_MAX;
- for (i = 0; i < max_mirrors; i++) {
- bytenr = btrfs_sb_offset(i);
- if (bytenr + BTRFS_SUPER_INFO_SIZE >=
- device->commit_total_bytes)
- break;
- bh = __find_get_block(device->bdev,
- bytenr / BTRFS_BDEV_BLOCKSIZE,
- BTRFS_SUPER_INFO_SIZE);
- if (!bh) {
- errors++;
- if (i == 0)
- primary_failed = true;
- continue;
- }
- wait_on_buffer(bh);
- if (!buffer_uptodate(bh)) {
- errors++;
- if (i == 0)
- primary_failed = true;
- }
- /* drop our reference */
- brelse(bh);
- /* drop the reference from the writing run */
- brelse(bh);
- }
- /* 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 request_queue *q = bdev_get_queue(device->bdev);
- struct bio *bio = device->flush_bio;
- if (!test_bit(QUEUE_FLAG_WC, &q->queue_flags))
- return;
- 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)
- {
- spin_lock(&fs_info->fs_roots_radix_lock);
- radix_tree_delete(&fs_info->fs_roots_radix,
- (unsigned long)root->root_key.objectid);
- spin_unlock(&fs_info->fs_roots_radix_lock);
- if (btrfs_root_refs(&root->root_item) == 0)
- synchronize_srcu(&fs_info->subvol_srcu);
- if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state)) {
- btrfs_free_log(NULL, root);
- if (root->reloc_root) {
- free_extent_buffer(root->reloc_root->node);
- free_extent_buffer(root->reloc_root->commit_root);
- btrfs_put_fs_root(root->reloc_root);
- root->reloc_root = NULL;
- }
- }
- if (root->free_ino_pinned)
- __btrfs_remove_free_space_cache(root->free_ino_pinned);
- if (root->free_ino_ctl)
- __btrfs_remove_free_space_cache(root->free_ino_ctl);
- btrfs_free_fs_root(root);
- }
- void btrfs_free_fs_root(struct btrfs_root *root)
- {
- iput(root->ino_cache_inode);
- WARN_ON(!RB_EMPTY_ROOT(&root->inode_tree));
- if (root->anon_dev)
- free_anon_bdev(root->anon_dev);
- if (root->subv_writers)
- btrfs_free_subvolume_writers(root->subv_writers);
- free_extent_buffer(root->node);
- free_extent_buffer(root->commit_root);
- kfree(root->free_ino_ctl);
- kfree(root->free_ino_pinned);
- btrfs_put_fs_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;
- int index;
- while (1) {
- index = srcu_read_lock(&fs_info->subvol_srcu);
- ret = radix_tree_gang_lookup(&fs_info->fs_roots_radix,
- (void **)gang, root_objectid,
- ARRAY_SIZE(gang));
- if (!ret) {
- srcu_read_unlock(&fs_info->subvol_srcu, index);
- 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_fs_root(gang[i]);
- }
- srcu_read_unlock(&fs_info->subvol_srcu, index);
- 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_fs_root(gang[i]);
- }
- root_objectid++;
- }
- /* release the uncleaned roots due to error */
- for (; i < ret; i++) {
- if (gang[i])
- btrfs_put_fs_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);
- }
- void 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);
- 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 (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state) ||
- test_bit(BTRFS_FS_STATE_TRANS_ABORTED, &fs_info->fs_state))
- 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);
- 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->dio_bytes))
- btrfs_info(fs_info, "at unmount dio bytes count %lld",
- percpu_counter_sum(&fs_info->dio_bytes));
- btrfs_sysfs_remove_mounted(fs_info);
- btrfs_sysfs_remove_fsid(fs_info->fs_devices);
- btrfs_free_fs_roots(fs_info);
- 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);
- clear_bit(BTRFS_FS_OPEN, &fs_info->flags);
- free_root_pointers(fs_info, true);
- /*
- * 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);
- percpu_counter_destroy(&fs_info->dirty_metadata_bytes);
- percpu_counter_destroy(&fs_info->delalloc_bytes);
- percpu_counter_destroy(&fs_info->dio_bytes);
- percpu_counter_destroy(&fs_info->dev_replace.bio_counter);
- cleanup_srcu_struct(&fs_info->subvol_srcu);
- btrfs_free_csum_hash(fs_info);
- btrfs_free_stripe_hash_table(fs_info);
- btrfs_free_ref_cache(fs_info);
- }
- 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;
- struct btrfs_root *root;
- 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
- root = BTRFS_I(buf->pages[0]->mapping->host)->root;
- fs_info = root->fs_info;
- btrfs_assert_tree_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_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_info(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)
- btrfs_pin_extent(fs_info, 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_fs_root(root);
- BUG_ON(!root);
- spin_unlock(&fs_info->delalloc_root_lock);
- btrfs_destroy_delalloc_inodes(root);
- btrfs_put_fs_root(root);
- spin_lock(&fs_info->delalloc_root_lock);
- }
- spin_unlock(&fs_info->delalloc_root_lock);
- }
- 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 *pinned_extents)
- {
- struct extent_io_tree *unpin;
- u64 start;
- u64 end;
- int ret;
- bool loop = true;
- unpin = pinned_extents;
- again:
- 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();
- }
- if (loop) {
- if (unpin == &fs_info->freed_extents[0])
- unpin = &fs_info->freed_extents[1];
- else
- unpin = &fs_info->freed_extents[0];
- loop = false;
- goto again;
- }
- return 0;
- }
- static void btrfs_cleanup_bg_io(struct btrfs_block_group_cache *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 *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_cache,
- 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_cache,
- 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,
- fs_info->pinned_extents);
- 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->tree_root);
- 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_pinned_extent(fs_info, fs_info->pinned_extents);
- btrfs_destroy_all_delalloc_inodes(fs_info);
- mutex_unlock(&fs_info->transaction_kthread_mutex);
- return 0;
- }
- static const struct extent_io_ops btree_extent_io_ops = {
- /* mandatory callbacks */
- .submit_bio_hook = btree_submit_bio_hook,
- .readpage_end_io_hook = btree_readpage_end_io_hook,
- };
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