diff options
Diffstat (limited to 'fs/btrfs/disk-io.c')
| -rw-r--r-- | fs/btrfs/disk-io.c | 5097 |
1 files changed, 5097 insertions, 0 deletions
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c new file mode 100644 index 000000000..819727460 --- /dev/null +++ b/fs/btrfs/disk-io.c @@ -0,0 +1,5097 @@ +// 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/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 <linux/unaligned.h> +#include "ctree.h" +#include "disk-io.h" +#include "transaction.h" +#include "btrfs_inode.h" +#include "delayed-inode.h" +#include "bio.h" +#include "print-tree.h" +#include "locking.h" +#include "tree-log.h" +#include "free-space-cache.h" +#include "free-space-tree.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" +#include "discard.h" +#include "space-info.h" +#include "zoned.h" +#include "subpage.h" +#include "fs.h" +#include "accessors.h" +#include "extent-tree.h" +#include "root-tree.h" +#include "defrag.h" +#include "uuid-tree.h" +#include "relocation.h" +#include "scrub.h" +#include "super.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 int btrfs_cleanup_transaction(struct btrfs_fs_info *fs_info); +static void btrfs_error_commit_super(struct btrfs_fs_info *fs_info); + +/* + * Compute the csum of a btree block and store the result to provided buffer. + */ +static void csum_tree_block(struct extent_buffer *buf, u8 *result) +{ + struct btrfs_fs_info *fs_info = buf->fs_info; + int num_pages; + u32 first_page_part; + struct btrfs_csum_ctx csum; + char *kaddr; + int i; + + btrfs_csum_init(&csum, fs_info->csum_type); + + if (buf->addr) { + /* Pages are contiguous, handle them as a big one. */ + kaddr = buf->addr; + first_page_part = fs_info->nodesize; + num_pages = 1; + } else { + kaddr = folio_address(buf->folios[0]); + first_page_part = min_t(u32, PAGE_SIZE, fs_info->nodesize); + num_pages = num_extent_pages(buf); + } + + btrfs_csum_update(&csum, kaddr + BTRFS_CSUM_SIZE, + first_page_part - BTRFS_CSUM_SIZE); + + /* + * Multiple single-page folios case would reach here. + * + * nodesize <= PAGE_SIZE and large folio all handled by above + * btrfs_csum_update() already. + */ + for (i = 1; i < num_pages && INLINE_EXTENT_BUFFER_PAGES > 1; i++) { + kaddr = folio_address(buf->folios[i]); + btrfs_csum_update(&csum, kaddr, PAGE_SIZE); + } + memset(result, 0, BTRFS_CSUM_SIZE); + btrfs_csum_final(&csum, result); +} + +/* + * 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. + */ +int btrfs_buffer_uptodate(struct extent_buffer *eb, u64 parent_transid, + const struct btrfs_tree_parent_check *check) +{ + if (!extent_buffer_uptodate(eb)) + return 0; + + if (!parent_transid || btrfs_header_generation(eb) == parent_transid) { + /* + * On a cache hit, the caller may still need tree parent + * verification before reusing the buffer. + */ + if (unlikely(check && btrfs_verify_level_key(eb, check))) + return -EUCLEAN; + return 1; + } + + if (btrfs_header_generation(eb) != parent_transid) { + btrfs_err_rl(eb->fs_info, +"parent transid verify failed on logical %llu mirror %u wanted %llu found %llu", + eb->start, eb->read_mirror, + parent_transid, btrfs_header_generation(eb)); + clear_extent_buffer_uptodate(eb); + return 0; + } + return 1; +} + +static bool btrfs_supported_super_csum(u16 csum_type) +{ + switch (csum_type) { + case BTRFS_CSUM_TYPE_CRC32: + case BTRFS_CSUM_TYPE_XXHASH: + case BTRFS_CSUM_TYPE_SHA256: + case BTRFS_CSUM_TYPE_BLAKE2: + 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. + */ +int btrfs_check_super_csum(struct btrfs_fs_info *fs_info, + const struct btrfs_super_block *disk_sb) +{ + u8 result[BTRFS_CSUM_SIZE]; + + /* + * The super_block structure does not span the whole + * BTRFS_SUPER_INFO_SIZE range, we expect that the unused space is + * filled with zeros and is included in the checksum. + */ + btrfs_csum(fs_info->csum_type, (const u8 *)disk_sb + BTRFS_CSUM_SIZE, + BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE, result); + + if (memcmp(disk_sb->csum, result, fs_info->csum_size)) + return 1; + + return 0; +} + +static int btrfs_repair_eb_io_failure(const struct extent_buffer *eb, + int mirror_num) +{ + struct btrfs_fs_info *fs_info = eb->fs_info; + const u32 step = min(fs_info->nodesize, PAGE_SIZE); + const u32 nr_steps = eb->len / step; + phys_addr_t paddrs[BTRFS_MAX_BLOCKSIZE / PAGE_SIZE]; + + if (sb_rdonly(fs_info->sb)) + return -EROFS; + + for (int i = 0; i < num_extent_pages(eb); i++) { + struct folio *folio = eb->folios[i]; + + /* No large folio support yet. */ + ASSERT(folio_order(folio) == 0); + ASSERT(i < nr_steps); + + /* + * For nodesize < page size, there is just one paddr, with some + * offset inside the page. + * + * For nodesize >= page size, it's one or more paddrs, and eb->start + * must be aligned to page boundary. + */ + paddrs[i] = page_to_phys(&folio->page) + offset_in_page(eb->start); + } + + return btrfs_repair_io_failure(fs_info, 0, eb->start, eb->len, + eb->start, paddrs, step, mirror_num); +} + +/* + * helper to read a given tree block, doing retries as required when + * the checksums don't match and we have alternate mirrors to try. + * + * @check: expected tree parentness check, see the comments of the + * structure for details. + */ +int btrfs_read_extent_buffer(struct extent_buffer *eb, + const struct btrfs_tree_parent_check *check) +{ + struct btrfs_fs_info *fs_info = eb->fs_info; + bool failed = false; + int ret; + int num_copies = 0; + int mirror_num = 0; + int failed_mirror = 0; + + ASSERT(check); + + while (1) { + ret = read_extent_buffer_pages(eb, mirror_num, check); + if (!ret) + break; + + num_copies = btrfs_num_copies(fs_info, + eb->start, eb->len); + if (num_copies == 1) + break; + + if (!failed_mirror) { + failed = true; + 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. + */ +int btree_csum_one_bio(struct btrfs_bio *bbio) +{ + struct extent_buffer *eb = bbio->private; + struct btrfs_fs_info *fs_info = eb->fs_info; + u64 found_start = btrfs_header_bytenr(eb); + u64 last_trans; + u8 result[BTRFS_CSUM_SIZE]; + int ret; + + /* Btree blocks are always contiguous on disk. */ + if (WARN_ON_ONCE(bbio->file_offset != eb->start)) + return -EIO; + if (WARN_ON_ONCE(bbio->bio.bi_iter.bi_size != eb->len)) + return -EIO; + + /* + * An extent_buffer marked EXTENT_BUFFER_ZONED_ZEROOUT is written out as + * zeros to preserve ordering of I/O without persisting the now + * unnecessary block. The bio is fed from the shared zero page (see + * write_one_eb()), so there is nothing to checksum here. Crucially, the + * buffer's own content is left intact: it may still be referenced, e.g. + * btrfs_free_tree_block() reads its header to add a delayed reference. + */ + if (test_bit(EXTENT_BUFFER_ZONED_ZEROOUT, &eb->bflags)) + return 0; + + if (WARN_ON_ONCE(found_start != eb->start)) + return -EIO; + if (WARN_ON(!btrfs_meta_folio_test_uptodate(eb->folios[0], eb))) + return -EIO; + + ASSERT(memcmp_extent_buffer(eb, fs_info->fs_devices->metadata_uuid, + offsetof(struct btrfs_header, fsid), + BTRFS_FSID_SIZE) == 0); + csum_tree_block(eb, result); + + if (btrfs_header_level(eb)) + ret = btrfs_check_node(eb); + else + ret = btrfs_check_leaf(eb); + + if (ret < 0) + goto error; + + /* + * Also check the generation, the eb reached here must be newer than + * last committed. Or something seriously wrong happened. + */ + last_trans = btrfs_get_last_trans_committed(fs_info); + if (unlikely(btrfs_header_generation(eb) <= last_trans)) { + ret = -EUCLEAN; + btrfs_err(fs_info, + "block=%llu bad generation, have %llu expect > %llu", + eb->start, btrfs_header_generation(eb), last_trans); + goto error; + } + write_extent_buffer(eb, result, 0, fs_info->csum_size); + return 0; + +error: + btrfs_print_tree(eb, 0); + btrfs_err(fs_info, "block=%llu write time tree block corruption detected", + eb->start); + /* + * Be noisy if this is an extent buffer from a log tree. We don't abort + * a transaction in case there's a bad log tree extent buffer, we just + * fallback to a transaction commit. Still we want to know when there is + * a bad log tree extent buffer, as that may signal a bug somewhere. + */ + WARN_ON(IS_ENABLED(CONFIG_BTRFS_DEBUG) || + btrfs_header_owner(eb) == BTRFS_TREE_LOG_OBJECTID); + return ret; +} + +static bool check_tree_block_fsid(struct extent_buffer *eb) +{ + struct btrfs_fs_info *fs_info = eb->fs_info; + struct btrfs_fs_devices *fs_devices = fs_info->fs_devices, *seed_devs; + u8 fsid[BTRFS_FSID_SIZE]; + + read_extent_buffer(eb, fsid, offsetof(struct btrfs_header, fsid), + BTRFS_FSID_SIZE); + + /* + * alloc_fsid_devices() copies the fsid into fs_devices::metadata_uuid. + * This is then overwritten by metadata_uuid if it is present in the + * device_list_add(). The same true for a seed device as well. So use of + * fs_devices::metadata_uuid is appropriate here. + */ + if (memcmp(fsid, fs_info->fs_devices->metadata_uuid, BTRFS_FSID_SIZE) == 0) + return false; + + list_for_each_entry(seed_devs, &fs_devices->seed_list, seed_list) + if (!memcmp(fsid, seed_devs->fsid, BTRFS_FSID_SIZE)) + return false; + + return true; +} + +/* Do basic extent buffer checks at read time */ +int btrfs_validate_extent_buffer(struct extent_buffer *eb, + const struct btrfs_tree_parent_check *check) +{ + struct btrfs_fs_info *fs_info = eb->fs_info; + u64 found_start; + const u32 csum_size = fs_info->csum_size; + u8 found_level; + u8 result[BTRFS_CSUM_SIZE]; + const u8 *header_csum; + int ret = 0; + const bool ignore_csum = btrfs_test_opt(fs_info, IGNOREMETACSUMS); + + ASSERT(check); + + found_start = btrfs_header_bytenr(eb); + if (unlikely(found_start != eb->start)) { + btrfs_err_rl(fs_info, + "bad tree block start, mirror %u want %llu have %llu", + eb->read_mirror, eb->start, found_start); + return -EIO; + } + if (unlikely(check_tree_block_fsid(eb))) { + btrfs_err_rl(fs_info, "bad fsid on logical %llu mirror %u", + eb->start, eb->read_mirror); + return -EIO; + } + found_level = btrfs_header_level(eb); + if (unlikely(found_level >= BTRFS_MAX_LEVEL)) { + btrfs_err(fs_info, + "bad tree block level, mirror %u level %d on logical %llu", + eb->read_mirror, btrfs_header_level(eb), eb->start); + return -EIO; + } + + csum_tree_block(eb, result); + header_csum = folio_address(eb->folios[0]) + + get_eb_offset_in_folio(eb, offsetof(struct btrfs_header, csum)); + + if (memcmp(result, header_csum, csum_size) != 0) { + btrfs_warn_rl(fs_info, +"checksum verify failed on logical %llu mirror %u wanted " BTRFS_CSUM_FMT " found " BTRFS_CSUM_FMT " level %d%s", + eb->start, eb->read_mirror, + BTRFS_CSUM_FMT_VALUE(csum_size, header_csum), + BTRFS_CSUM_FMT_VALUE(csum_size, result), + btrfs_header_level(eb), + ignore_csum ? ", ignored" : ""); + if (unlikely(!ignore_csum)) + return -EUCLEAN; + } + + if (unlikely(found_level != check->level)) { + btrfs_err(fs_info, + "level verify failed on logical %llu mirror %u wanted %u found %u", + eb->start, eb->read_mirror, check->level, found_level); + return -EIO; + } + if (unlikely(check->transid && + btrfs_header_generation(eb) != check->transid)) { + btrfs_err_rl(eb->fs_info, +"parent transid verify failed on logical %llu mirror %u wanted %llu found %llu", + eb->start, eb->read_mirror, check->transid, + btrfs_header_generation(eb)); + return -EIO; + } + if (check->has_first_key) { + const struct btrfs_key *expect_key = &check->first_key; + struct btrfs_key found_key; + + if (found_level) + btrfs_node_key_to_cpu(eb, &found_key, 0); + else + btrfs_item_key_to_cpu(eb, &found_key, 0); + if (unlikely(btrfs_comp_cpu_keys(expect_key, &found_key))) { + 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, check->transid, + expect_key->objectid, + expect_key->type, expect_key->offset, + found_key.objectid, found_key.type, + found_key.offset); + return -EUCLEAN; + } + } + if (check->owner_root) { + ret = btrfs_check_eb_owner(eb, check->owner_root); + if (ret < 0) + return ret; + } + + /* If this is a leaf block and it is corrupt, just return -EIO. */ + if (found_level == 0 && btrfs_check_leaf(eb)) + ret = -EIO; + + if (found_level > 0 && btrfs_check_node(eb)) + ret = -EIO; + + if (ret) + btrfs_err(fs_info, + "read time tree block corruption detected on logical %llu mirror %u", + eb->start, eb->read_mirror); + return ret; +} + +#ifdef CONFIG_MIGRATION +static int btree_migrate_folio(struct address_space *mapping, + struct folio *dst, struct folio *src, enum migrate_mode mode) +{ + /* + * we can't safely write a btree page from here, + * we haven't done the locking hook + */ + if (folio_test_dirty(src)) + return -EAGAIN; + /* + * Buffers may be managed in a filesystem specific way. + * We must have no buffers or drop them. + */ + if (folio_get_private(src) && + !filemap_release_folio(src, GFP_KERNEL)) + return -EAGAIN; + return migrate_folio(mapping, dst, src, mode); +} +#else +#define btree_migrate_folio NULL +#endif + +static bool btree_release_folio(struct folio *folio, gfp_t gfp_flags) +{ + if (folio_test_writeback(folio) || folio_test_dirty(folio)) + return false; + + return try_release_extent_buffer(folio); +} + +static void btree_invalidate_folio(struct folio *folio, size_t offset, + size_t length) +{ + struct extent_io_tree *tree = &folio_to_inode(folio)->io_tree; + struct extent_state *cached_state = NULL; + const u64 start = folio_pos(folio); + const u64 end = folio_next_pos(folio) - 1; + + /* + * The range must cover the full @folio. + * Btree inode is never exposed to regular file operations, thus there + * is no partial truncation. + * The folio is only invalidated when the btree inode is evicted. + */ + ASSERT(offset == 0, "folio=%llu offset=%zu", folio_pos(folio), offset); + ASSERT(length == folio_size(folio), "folio=%llu folio_size=%zu length=%zu", + folio_pos(folio), folio_size(folio), length); + + /* This function is only called for the btree inode */ + ASSERT(tree->owner == IO_TREE_BTREE_INODE_IO); + + btrfs_lock_extent(tree, start, end, &cached_state); + folio_wait_writeback(folio); + + /* + * Currently for btree io tree, only EXTENT_LOCKED is utilized, + * so here we only need to unlock the extent range to free any + * existing extent state. + */ + btrfs_unlock_extent(tree, start, end, &cached_state); + + btree_release_folio(folio, GFP_NOFS); + if (folio_get_private(folio)) { + btrfs_warn(folio_to_fs_info(folio), + "folio private not zero on folio %llu", + (unsigned long long)folio_pos(folio)); + folio_detach_private(folio); + } +} + +#ifdef DEBUG +static bool btree_dirty_folio(struct address_space *mapping, + struct folio *folio) +{ + struct btrfs_fs_info *fs_info = inode_to_fs_info(mapping->host); + struct btrfs_subpage_info *spi = fs_info->subpage_info; + struct btrfs_subpage *subpage; + struct extent_buffer *eb; + int cur_bit = 0; + u64 page_start = folio_pos(folio); + + if (fs_info->sectorsize == PAGE_SIZE) { + eb = folio_get_private(folio); + BUG_ON(!eb); + BUG_ON(!test_bit(EXTENT_BUFFER_DIRTY, &eb->bflags)); + BUG_ON(!atomic_read(&eb->refs)); + btrfs_assert_tree_write_locked(eb); + return filemap_dirty_folio(mapping, folio); + } + + ASSERT(spi); + subpage = folio_get_private(folio); + + for (cur_bit = spi->dirty_offset; + cur_bit < spi->dirty_offset + spi->bitmap_nr_bits; + cur_bit++) { + unsigned long flags; + u64 cur; + + spin_lock_irqsave(&subpage->lock, flags); + if (!test_bit(cur_bit, subpage->bitmaps)) { + spin_unlock_irqrestore(&subpage->lock, flags); + continue; + } + spin_unlock_irqrestore(&subpage->lock, flags); + cur = page_start + (cur_bit << fs_info->sectorsize_bits); + + eb = find_extent_buffer(fs_info, cur); + ASSERT(eb); + ASSERT(test_bit(EXTENT_BUFFER_DIRTY, &eb->bflags)); + ASSERT(atomic_read(&eb->refs)); + btrfs_assert_tree_write_locked(eb); + free_extent_buffer(eb); + + cur_bit += (fs_info->nodesize >> fs_info->sectorsize_bits) - 1; + } + return filemap_dirty_folio(mapping, folio); +} +#else +#define btree_dirty_folio filemap_dirty_folio +#endif + +static const struct address_space_operations btree_aops = { + .writepages = btree_writepages, + .release_folio = btree_release_folio, + .invalidate_folio = btree_invalidate_folio, + .migrate_folio = btree_migrate_folio, + .dirty_folio = btree_dirty_folio, +}; + +struct extent_buffer *btrfs_find_create_tree_block( + struct btrfs_fs_info *fs_info, + struct btrfs_eb_prealloc *pa, + u64 bytenr, u64 owner_root, + int level) +{ + if (btrfs_is_testing(fs_info)) + return alloc_test_extent_buffer(fs_info, bytenr); + return alloc_extent_buffer(fs_info, pa, bytenr, owner_root, level); +} + +/* + * Read tree block at logical address @bytenr and do variant basic but critical + * verification. + * + * @check: expected tree parentness check, see comments of the + * structure for details. + */ +struct extent_buffer *read_tree_block(struct btrfs_fs_info *fs_info, u64 bytenr, + struct btrfs_tree_parent_check *check) +{ + struct btrfs_eb_prealloc pa = { 0 }; + struct extent_buffer *buf = NULL; + int ret; + + ASSERT(check); + + buf = btrfs_find_create_tree_block(fs_info, &pa, bytenr, check->owner_root, + check->level); + if (IS_ERR(buf)) + return buf; + + ret = btrfs_read_extent_buffer(buf, check); + if (ret) { + free_extent_buffer_stale(buf); + return ERR_PTR(ret); + } + return buf; + +} + +static struct btrfs_root *btrfs_alloc_root(struct btrfs_fs_info *fs_info, + u64 objectid, gfp_t flags) +{ + struct btrfs_root *root; + + root = kzalloc_obj(*root, flags); + if (!root) + return NULL; + + root->fs_info = fs_info; + root->root_key.objectid = objectid; + RB_CLEAR_NODE(&root->rb_node); + + xa_init(&root->inodes); + xa_init(&root->delayed_nodes); + + btrfs_init_root_block_rsv(root); + + INIT_LIST_HEAD(&root->dirty_list); + INIT_LIST_HEAD(&root->root_list); + INIT_LIST_HEAD(&root->delalloc_inodes); + INIT_LIST_HEAD(&root->delalloc_root); + INIT_LIST_HEAD(&root->ordered_extents); + INIT_LIST_HEAD(&root->ordered_root); + INIT_LIST_HEAD(&root->reloc_dirty_list); + spin_lock_init(&root->delalloc_lock); + spin_lock_init(&root->ordered_extent_lock); + spin_lock_init(&root->accounting_lock); + 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_writers, 0); + refcount_set(&root->refs, 1); + atomic_set(&root->snapshot_force_cow, 0); + atomic_set(&root->nr_swapfiles, 0); + root->log_transid_committed = -1; + if (!btrfs_is_testing(fs_info)) { + btrfs_extent_io_tree_init(fs_info, &root->dirty_log_pages, + IO_TREE_ROOT_DIRTY_LOG_PAGES); + btrfs_extent_io_tree_init(fs_info, &root->log_csum_range, + IO_TREE_LOG_CSUM_RANGE); + } + + spin_lock_init(&root->root_item_lock); + btrfs_qgroup_init_swapped_blocks(&root->swapped_blocks); +#ifdef CONFIG_BTRFS_DEBUG + INIT_LIST_HEAD(&root->leak_list); + spin_lock(&fs_info->fs_roots_radix_lock); + list_add_tail(&root->leak_list, &fs_info->allocated_roots); + spin_unlock(&fs_info->fs_roots_radix_lock); +#endif + + return root; +} + +#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS +/* Should only be used by the testing infrastructure */ +struct btrfs_root *btrfs_alloc_dummy_root(struct btrfs_fs_info *fs_info) +{ + struct btrfs_root *root; + + if (!fs_info) + return ERR_PTR(-EINVAL); + + root = btrfs_alloc_root(fs_info, BTRFS_ROOT_TREE_OBJECTID, GFP_KERNEL); + if (!root) + return ERR_PTR(-ENOMEM); + + /* We don't use the stripesize in selftest, set it as sectorsize */ + root->alloc_bytenr = 0; + + return root; +} +#endif + +static int global_root_cmp(struct rb_node *a_node, const struct rb_node *b_node) +{ + const struct btrfs_root *a = rb_entry(a_node, struct btrfs_root, rb_node); + const struct btrfs_root *b = rb_entry(b_node, struct btrfs_root, rb_node); + + return btrfs_comp_cpu_keys(&a->root_key, &b->root_key); +} + +static int global_root_key_cmp(const void *k, const struct rb_node *node) +{ + const struct btrfs_key *key = k; + const struct btrfs_root *root = rb_entry(node, struct btrfs_root, rb_node); + + return btrfs_comp_cpu_keys(key, &root->root_key); +} + +int btrfs_global_root_insert(struct btrfs_root *root) +{ + struct btrfs_fs_info *fs_info = root->fs_info; + struct rb_node *tmp; + int ret = 0; + + write_lock(&fs_info->global_root_lock); + tmp = rb_find_add(&root->rb_node, &fs_info->global_root_tree, global_root_cmp); + write_unlock(&fs_info->global_root_lock); + + if (tmp) { + ret = -EEXIST; + btrfs_warn(fs_info, "global root %llu %llu already exists", + btrfs_root_id(root), root->root_key.offset); + } + return ret; +} + +void btrfs_global_root_delete(struct btrfs_root *root) +{ + struct btrfs_fs_info *fs_info = root->fs_info; + + write_lock(&fs_info->global_root_lock); + rb_erase(&root->rb_node, &fs_info->global_root_tree); + write_unlock(&fs_info->global_root_lock); +} + +struct btrfs_root *btrfs_global_root(struct btrfs_fs_info *fs_info, + const struct btrfs_key *key) +{ + struct rb_node *node; + struct btrfs_root *root = NULL; + + read_lock(&fs_info->global_root_lock); + node = rb_find(key, &fs_info->global_root_tree, global_root_key_cmp); + if (node) + root = container_of(node, struct btrfs_root, rb_node); + read_unlock(&fs_info->global_root_lock); + + return root; +} + +static u64 btrfs_global_root_id(struct btrfs_fs_info *fs_info, u64 bytenr) +{ + struct btrfs_block_group *block_group; + u64 ret; + + if (!btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) + return 0; + + if (bytenr) + block_group = btrfs_lookup_block_group(fs_info, bytenr); + else + block_group = btrfs_lookup_first_block_group(fs_info, bytenr); + ASSERT(block_group); + if (!block_group) + return 0; + ret = block_group->global_root_id; + btrfs_put_block_group(block_group); + + return ret; +} + +struct btrfs_root *btrfs_csum_root(struct btrfs_fs_info *fs_info, u64 bytenr) +{ + const struct btrfs_key key = { + .objectid = BTRFS_CSUM_TREE_OBJECTID, + .type = BTRFS_ROOT_ITEM_KEY, + .offset = btrfs_global_root_id(fs_info, bytenr), + }; + + return btrfs_global_root(fs_info, &key); +} + +struct btrfs_root *btrfs_extent_root(struct btrfs_fs_info *fs_info, u64 bytenr) +{ + const struct btrfs_key key = { + .objectid = BTRFS_EXTENT_TREE_OBJECTID, + .type = BTRFS_ROOT_ITEM_KEY, + .offset = btrfs_global_root_id(fs_info, bytenr), + }; + + return btrfs_global_root(fs_info, &key); +} + +struct btrfs_root *btrfs_create_tree(struct btrfs_trans_handle *trans, + u64 objectid) +{ + struct btrfs_fs_info *fs_info = trans->fs_info; + struct extent_buffer *leaf; + struct btrfs_root *tree_root = fs_info->tree_root; + struct btrfs_root *root; + unsigned int nofs_flag; + int ret = 0; + + /* + * We're holding a transaction handle, so use a NOFS memory allocation + * context to avoid deadlock if reclaim happens. + */ + nofs_flag = memalloc_nofs_save(); + root = btrfs_alloc_root(fs_info, objectid, GFP_KERNEL); + memalloc_nofs_restore(nofs_flag); + if (!root) + return ERR_PTR(-ENOMEM); + + root->root_key.objectid = objectid; + root->root_key.type = BTRFS_ROOT_ITEM_KEY; + root->root_key.offset = 0; + + leaf = btrfs_alloc_tree_block(trans, root, 0, objectid, NULL, 0, 0, 0, + 0, BTRFS_NESTING_NORMAL); + if (IS_ERR(leaf)) { + ret = PTR_ERR(leaf); + leaf = NULL; + goto fail; + } + + root->node = leaf; + btrfs_mark_buffer_dirty(trans, leaf); + + root->commit_root = btrfs_root_node(root); + set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state); + + btrfs_set_root_flags(&root->root_item, 0); + btrfs_set_root_limit(&root->root_item, 0); + btrfs_set_root_bytenr(&root->root_item, leaf->start); + btrfs_set_root_generation(&root->root_item, trans->transid); + btrfs_set_root_level(&root->root_item, 0); + btrfs_set_root_refs(&root->root_item, 1); + btrfs_set_root_used(&root->root_item, leaf->len); + btrfs_set_root_last_snapshot(&root->root_item, 0); + btrfs_set_root_dirid(&root->root_item, 0); + if (btrfs_is_fstree(objectid)) + generate_random_guid(root->root_item.uuid); + else + export_guid(root->root_item.uuid, &guid_null); + btrfs_set_root_drop_level(&root->root_item, 0); + + btrfs_tree_unlock(leaf); + + ret = btrfs_insert_root(trans, tree_root, &root->root_key, &root->root_item); + if (ret) + goto fail; + + return root; + +fail: + btrfs_put_root(root); + + return ERR_PTR(ret); +} + +static struct btrfs_root *alloc_log_tree(struct btrfs_fs_info *fs_info) +{ + struct btrfs_root *root; + + root = btrfs_alloc_root(fs_info, BTRFS_TREE_LOG_OBJECTID, GFP_NOFS); + if (!root) + return ERR_PTR(-ENOMEM); + + root->root_key.objectid = BTRFS_TREE_LOG_OBJECTID; + root->root_key.type = BTRFS_ROOT_ITEM_KEY; + root->root_key.offset = BTRFS_TREE_LOG_OBJECTID; + + return root; +} + +int btrfs_alloc_log_tree_node(struct btrfs_trans_handle *trans, + struct btrfs_root *root) +{ + struct extent_buffer *leaf; + + /* + * DON'T set SHAREABLE bit for log trees. + * + * Log trees are not exposed to user space thus can't be snapshotted, + * and they go away before a real commit is actually done. + * + * They do store pointers to file data extents, and those reference + * counts still get updated (along with back refs to the log tree). + */ + + leaf = btrfs_alloc_tree_block(trans, root, 0, BTRFS_TREE_LOG_OBJECTID, + NULL, 0, 0, 0, 0, BTRFS_NESTING_NORMAL); + if (IS_ERR(leaf)) + return PTR_ERR(leaf); + + root->node = leaf; + + btrfs_mark_buffer_dirty(trans, root->node); + btrfs_tree_unlock(root->node); + + return 0; +} + +int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans, + struct btrfs_fs_info *fs_info) +{ + struct btrfs_root *log_root; + + log_root = alloc_log_tree(fs_info); + if (IS_ERR(log_root)) + return PTR_ERR(log_root); + + if (!btrfs_is_zoned(fs_info)) { + int ret = btrfs_alloc_log_tree_node(trans, log_root); + + if (ret) { + btrfs_put_root(log_root); + return ret; + } + } + + WARN_ON(fs_info->log_root_tree); + fs_info->log_root_tree = log_root; + return 0; +} + +int btrfs_add_log_tree(struct btrfs_trans_handle *trans, + struct btrfs_root *root) +{ + struct btrfs_fs_info *fs_info = root->fs_info; + struct btrfs_root *log_root; + struct btrfs_inode_item *inode_item; + int ret; + + log_root = alloc_log_tree(fs_info); + if (IS_ERR(log_root)) + return PTR_ERR(log_root); + + ret = btrfs_alloc_log_tree_node(trans, log_root); + if (ret) { + btrfs_put_root(log_root); + return ret; + } + + btrfs_set_root_last_trans(log_root, trans->transid); + log_root->root_key.offset = btrfs_root_id(root); + + 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; + btrfs_set_root_log_transid(root, 0); + root->log_transid_committed = -1; + btrfs_set_root_last_log_commit(root, 0); + return 0; +} + +static struct btrfs_root *read_tree_root_path(struct btrfs_root *tree_root, + struct btrfs_path *path, + const struct btrfs_key *key) +{ + struct btrfs_root *root; + struct btrfs_tree_parent_check check = { 0 }; + struct btrfs_fs_info *fs_info = tree_root->fs_info; + u64 generation; + int ret; + int level; + + root = btrfs_alloc_root(fs_info, key->objectid, GFP_NOFS); + if (!root) + return ERR_PTR(-ENOMEM); + + ret = btrfs_find_root(tree_root, key, path, + &root->root_item, &root->root_key); + if (ret) { + if (ret > 0) + ret = -ENOENT; + goto fail; + } + + generation = btrfs_root_generation(&root->root_item); + level = btrfs_root_level(&root->root_item); + check.level = level; + check.transid = generation; + check.owner_root = key->objectid; + root->node = read_tree_block(fs_info, btrfs_root_bytenr(&root->root_item), + &check); + if (IS_ERR(root->node)) { + ret = PTR_ERR(root->node); + root->node = NULL; + goto fail; + } + + ret = btrfs_buffer_uptodate(root->node, generation, &check); + if (unlikely(ret <= 0)) { + if (ret == 0) + ret = -EIO; + goto fail; + } + + /* + * For real fs, and not log/reloc trees, root owner must + * match its root node owner + */ + if (unlikely(!btrfs_is_testing(fs_info) && + btrfs_root_id(root) != BTRFS_TREE_LOG_OBJECTID && + btrfs_root_id(root) != BTRFS_TREE_RELOC_OBJECTID && + btrfs_root_id(root) != btrfs_header_owner(root->node))) { + btrfs_crit(fs_info, +"root=%llu block=%llu, tree root owner mismatch, have %llu expect %llu", + btrfs_root_id(root), root->node->start, + btrfs_header_owner(root->node), + btrfs_root_id(root)); + ret = -EUCLEAN; + goto fail; + } + root->commit_root = btrfs_root_node(root); + return root; +fail: + btrfs_put_root(root); + return ERR_PTR(ret); +} + +struct btrfs_root *btrfs_read_tree_root(struct btrfs_root *tree_root, + const struct btrfs_key *key) +{ + struct btrfs_root *root; + BTRFS_PATH_AUTO_FREE(path); + + path = btrfs_alloc_path(); + if (!path) + return ERR_PTR(-ENOMEM); + root = read_tree_root_path(tree_root, path, key); + + return root; +} + +/* + * Initialize subvolume root in-memory structure. + * + * @anon_dev: anonymous device to attach to the root, if zero, allocate new + * + * In case of failure the caller is responsible to call btrfs_free_fs_root() + */ +static int btrfs_init_fs_root(struct btrfs_root *root, dev_t anon_dev) +{ + int ret; + + btrfs_drew_lock_init(&root->snapshot_lock); + + if (btrfs_root_id(root) != BTRFS_TREE_LOG_OBJECTID && + !btrfs_is_data_reloc_root(root) && + btrfs_is_fstree(btrfs_root_id(root))) { + set_bit(BTRFS_ROOT_SHAREABLE, &root->state); + btrfs_check_and_init_root_item(&root->root_item); + } + + /* + * Don't assign anonymous block device to roots that are not exposed to + * userspace, the id pool is limited to 1M + */ + if (btrfs_is_fstree(btrfs_root_id(root)) && + btrfs_root_refs(&root->root_item) > 0) { + if (!anon_dev) { + ret = get_anon_bdev(&root->anon_dev); + if (ret) + return ret; + } else { + root->anon_dev = anon_dev; + } + } + + mutex_lock(&root->objectid_mutex); + ret = btrfs_init_root_free_objectid(root); + if (ret) { + mutex_unlock(&root->objectid_mutex); + return ret; + } + + ASSERT(root->free_objectid <= BTRFS_LAST_FREE_OBJECTID); + + mutex_unlock(&root->objectid_mutex); + + return 0; +} + +static struct btrfs_root *btrfs_lookup_fs_root(struct btrfs_fs_info *fs_info, + u64 root_id) +{ + struct btrfs_root *root; + + spin_lock(&fs_info->fs_roots_radix_lock); + root = radix_tree_lookup(&fs_info->fs_roots_radix, + (unsigned long)root_id); + root = btrfs_grab_root(root); + spin_unlock(&fs_info->fs_roots_radix_lock); + return root; +} + +static struct btrfs_root *btrfs_get_global_root(struct btrfs_fs_info *fs_info, + u64 objectid) +{ + struct btrfs_key key = { + .objectid = objectid, + .type = BTRFS_ROOT_ITEM_KEY, + .offset = 0, + }; + + switch (objectid) { + case BTRFS_ROOT_TREE_OBJECTID: + return btrfs_grab_root(fs_info->tree_root); + case BTRFS_EXTENT_TREE_OBJECTID: + return btrfs_grab_root(btrfs_global_root(fs_info, &key)); + case BTRFS_CHUNK_TREE_OBJECTID: + return btrfs_grab_root(fs_info->chunk_root); + case BTRFS_DEV_TREE_OBJECTID: + return btrfs_grab_root(fs_info->dev_root); + case BTRFS_CSUM_TREE_OBJECTID: + return btrfs_grab_root(btrfs_global_root(fs_info, &key)); + case BTRFS_QUOTA_TREE_OBJECTID: + return btrfs_grab_root(fs_info->quota_root); + case BTRFS_UUID_TREE_OBJECTID: + return btrfs_grab_root(fs_info->uuid_root); + case BTRFS_BLOCK_GROUP_TREE_OBJECTID: + return btrfs_grab_root(fs_info->block_group_root); + case BTRFS_FREE_SPACE_TREE_OBJECTID: + return btrfs_grab_root(btrfs_global_root(fs_info, &key)); + case BTRFS_RAID_STRIPE_TREE_OBJECTID: + return btrfs_grab_root(fs_info->stripe_root); + case BTRFS_REMAP_TREE_OBJECTID: + return btrfs_grab_root(fs_info->remap_root); + default: + return NULL; + } +} + +int btrfs_insert_fs_root(struct btrfs_fs_info *fs_info, + struct btrfs_root *root) +{ + int ret; + + ret = radix_tree_preload(GFP_NOFS); + if (ret) + return ret; + + spin_lock(&fs_info->fs_roots_radix_lock); + ret = radix_tree_insert(&fs_info->fs_roots_radix, + (unsigned long)btrfs_root_id(root), + root); + if (ret == 0) { + btrfs_grab_root(root); + set_bit(BTRFS_ROOT_IN_RADIX, &root->state); + } + spin_unlock(&fs_info->fs_roots_radix_lock); + radix_tree_preload_end(); + + return ret; +} + +void btrfs_check_leaked_roots(const struct btrfs_fs_info *fs_info) +{ +#ifdef CONFIG_BTRFS_DEBUG + struct btrfs_root *root; + + while (!list_empty(&fs_info->allocated_roots)) { + char buf[BTRFS_ROOT_NAME_BUF_LEN]; + + root = list_first_entry(&fs_info->allocated_roots, + struct btrfs_root, leak_list); + btrfs_err(fs_info, "leaked root %s refcount %d", + btrfs_root_name(&root->root_key, buf), + refcount_read(&root->refs)); + WARN_ON_ONCE(1); + while (refcount_read(&root->refs) > 1) + btrfs_put_root(root); + btrfs_put_root(root); + } +#endif +} + +static void free_global_roots(struct btrfs_fs_info *fs_info) +{ + struct btrfs_root *root; + struct rb_node *node; + + while ((node = rb_first_postorder(&fs_info->global_root_tree)) != NULL) { + root = rb_entry(node, struct btrfs_root, rb_node); + rb_erase(&root->rb_node, &fs_info->global_root_tree); + btrfs_put_root(root); + } +} + +void btrfs_free_fs_info(struct btrfs_fs_info *fs_info) +{ + struct percpu_counter *em_counter = &fs_info->evictable_extent_maps; + + if (fs_info->fs_devices) + btrfs_close_devices(fs_info->fs_devices); + btrfs_free_compress_wsm(fs_info); + percpu_counter_destroy(&fs_info->stats_read_blocks); + percpu_counter_destroy(&fs_info->dirty_metadata_bytes); + percpu_counter_destroy(&fs_info->delalloc_bytes); + percpu_counter_destroy(&fs_info->ordered_bytes); + if (percpu_counter_initialized(em_counter)) + ASSERT(percpu_counter_sum_positive(em_counter) == 0); + percpu_counter_destroy(em_counter); + percpu_counter_destroy(&fs_info->dev_replace.bio_counter); + btrfs_free_stripe_hash_table(fs_info); + btrfs_free_ref_cache(fs_info); + kfree(fs_info->balance_ctl); + free_global_roots(fs_info); + btrfs_put_root(fs_info->tree_root); + btrfs_put_root(fs_info->chunk_root); + btrfs_put_root(fs_info->dev_root); + btrfs_put_root(fs_info->quota_root); + btrfs_put_root(fs_info->uuid_root); + btrfs_put_root(fs_info->fs_root); + btrfs_put_root(fs_info->data_reloc_root); + btrfs_put_root(fs_info->block_group_root); + btrfs_put_root(fs_info->stripe_root); + btrfs_put_root(fs_info->remap_root); + btrfs_check_leaked_roots(fs_info); + btrfs_extent_buffer_leak_debug_check(fs_info); + kfree(fs_info->super_copy); + kfree(fs_info->super_for_commit); + kvfree(fs_info); +} + + +/* + * Get an in-memory reference of a root structure. + * + * For essential trees like root/extent tree, we grab it from fs_info directly. + * For subvolume trees, we check the cached filesystem roots first. If not + * found, then read it from disk and add it to cached fs roots. + * + * Caller should release the root by calling btrfs_put_root() after the usage. + * + * NOTE: Reloc and log trees can't be read by this function as they share the + * same root objectid. + * + * @objectid: root id + * @anon_dev: preallocated anonymous block device number for new roots, + * pass NULL for a new allocation. + * @check_ref: whether to check root item references, If true, return -ENOENT + * for orphan roots + */ +static struct btrfs_root *btrfs_get_root_ref(struct btrfs_fs_info *fs_info, + u64 objectid, dev_t *anon_dev, + bool check_ref) +{ + struct btrfs_root *root; + struct btrfs_path *path; + struct btrfs_key key; + int ret; + + root = btrfs_get_global_root(fs_info, objectid); + if (root) + return root; + + /* + * If we're called for non-subvolume trees, and above function didn't + * find one, do not try to read it from disk. + * + * This is namely for free-space-tree and quota tree, which can change + * at runtime and should only be grabbed from fs_info. + */ + if (!btrfs_is_fstree(objectid) && objectid != BTRFS_DATA_RELOC_TREE_OBJECTID) + return ERR_PTR(-ENOENT); +again: + root = btrfs_lookup_fs_root(fs_info, objectid); + if (root) { + /* + * Some other caller may have read out the newly inserted + * subvolume already (for things like backref walk etc). Not + * that common but still possible. In that case, we just need + * to free the anon_dev. + */ + if (unlikely(anon_dev && *anon_dev)) { + free_anon_bdev(*anon_dev); + *anon_dev = 0; + } + + if (check_ref && btrfs_root_refs(&root->root_item) == 0) { + btrfs_put_root(root); + return ERR_PTR(-ENOENT); + } + return root; + } + + key.objectid = objectid; + key.type = BTRFS_ROOT_ITEM_KEY; + key.offset = (u64)-1; + root = btrfs_read_tree_root(fs_info->tree_root, &key); + if (IS_ERR(root)) + return root; + + if (check_ref && btrfs_root_refs(&root->root_item) == 0) { + ret = -ENOENT; + goto fail; + } + + ret = btrfs_init_fs_root(root, anon_dev ? *anon_dev : 0); + if (ret) + goto fail; + + path = btrfs_alloc_path(); + if (!path) { + ret = -ENOMEM; + goto fail; + } + key.objectid = BTRFS_ORPHAN_OBJECTID; + key.type = BTRFS_ORPHAN_ITEM_KEY; + key.offset = objectid; + + ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0); + btrfs_free_path(path); + if (ret < 0) + goto fail; + if (ret == 0) + set_bit(BTRFS_ROOT_ORPHAN_ITEM_INSERTED, &root->state); + + ret = btrfs_insert_fs_root(fs_info, root); + if (ret) { + if (ret == -EEXIST) { + btrfs_put_root(root); + goto again; + } + goto fail; + } + return root; +fail: + /* + * If our caller provided us an anonymous device, then it's his + * responsibility to free it in case we fail. So we have to set our + * root's anon_dev to 0 to avoid a double free, once by btrfs_put_root() + * and once again by our caller. + */ + if (anon_dev && *anon_dev) + root->anon_dev = 0; + btrfs_put_root(root); + return ERR_PTR(ret); +} + +/* + * Get in-memory reference of a root structure + * + * @objectid: tree objectid + * @check_ref: if set, verify that the tree exists and the item has at least + * one reference + */ +struct btrfs_root *btrfs_get_fs_root(struct btrfs_fs_info *fs_info, + u64 objectid, bool check_ref) +{ + return btrfs_get_root_ref(fs_info, objectid, NULL, check_ref); +} + +/* + * Get in-memory reference of a root structure, created as new, optionally pass + * the anonymous block device id + * + * @objectid: tree objectid + * @anon_dev: if NULL, allocate a new anonymous block device or use the + * parameter value if not NULL + */ +struct btrfs_root *btrfs_get_new_fs_root(struct btrfs_fs_info *fs_info, + u64 objectid, dev_t *anon_dev) +{ + return btrfs_get_root_ref(fs_info, objectid, anon_dev, true); +} + +/* + * Return a root for the given objectid. + * + * @fs_info: the fs_info + * @objectid: the objectid we need to lookup + * + * This is exclusively used for backref walking, and exists specifically because + * of how qgroups does lookups. Qgroups will do a backref lookup at delayed ref + * creation time, which means we may have to read the tree_root in order to look + * up a fs root that is not in memory. If the root is not in memory we will + * read the tree root commit root and look up the fs root from there. This is a + * temporary root, it will not be inserted into the radix tree as it doesn't + * have the most uptodate information, it'll simply be discarded once the + * backref code is finished using the root. + */ +struct btrfs_root *btrfs_get_fs_root_commit_root(struct btrfs_fs_info *fs_info, + struct btrfs_path *path, + u64 objectid) +{ + struct btrfs_root *root; + struct btrfs_key key; + + ASSERT(path->search_commit_root && path->skip_locking); + + /* + * This can return -ENOENT if we ask for a root that doesn't exist, but + * since this is called via the backref walking code we won't be looking + * up a root that doesn't exist, unless there's corruption. So if root + * != NULL just return it. + */ + root = btrfs_get_global_root(fs_info, objectid); + if (root) + return root; + + root = btrfs_lookup_fs_root(fs_info, objectid); + if (root) + return root; + + key.objectid = objectid; + key.type = BTRFS_ROOT_ITEM_KEY; + key.offset = (u64)-1; + root = read_tree_root_path(fs_info->tree_root, path, &key); + btrfs_release_path(path); + + return root; +} + +static int cleaner_kthread(void *arg) +{ + struct btrfs_fs_info *fs_info = arg; + 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; + } + + if (test_and_clear_bit(BTRFS_FS_FEATURE_CHANGED, &fs_info->flags)) + btrfs_sysfs_feature_update(fs_info); + + btrfs_run_delayed_iputs(fs_info); + + again = btrfs_clean_one_deleted_snapshot(fs_info); + 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); + + if (btrfs_fs_incompat(fs_info, REMAP_TREE) && + !btrfs_test_opt(fs_info, DISCARD_ASYNC)) + btrfs_handle_fully_remapped_bgs(fs_info); + + /* + * Acquires fs_info->reclaim_bgs_lock to avoid racing + * with relocation (btrfs_relocate_chunk) and relocation + * acquires fs_info->cleaner_mutex (btrfs_relocate_block_group) + * after acquiring fs_info->reclaim_bgs_lock. So we + * can't hold, nor need to, fs_info->cleaner_mutex when deleting + * unused block groups. + */ + btrfs_delete_unused_bgs(fs_info); + + /* + * Reclaim block groups in the reclaim_bgs list after we deleted + * all unused block_groups. This possibly gives us some more free + * space. + */ + btrfs_reclaim_bgs(fs_info); +sleep: + clear_and_wake_up_bit(BTRFS_FS_CLEANER_RUNNING, &fs_info->flags); + if (kthread_should_park()) + kthread_parkme(); + if (kthread_should_stop()) + return 0; + if (!again) { + set_current_state(TASK_INTERRUPTIBLE); + schedule(); + __set_current_state(TASK_RUNNING); + } + } +} + +static int transaction_kthread(void *arg) +{ + struct btrfs_root *root = arg; + struct btrfs_fs_info *fs_info = root->fs_info; + struct btrfs_trans_handle *trans; + struct btrfs_transaction *cur; + u64 transid; + time64_t delta; + unsigned long delay; + bool cannot_commit; + + do { + cannot_commit = false; + delay = secs_to_jiffies(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; + } + + delta = ktime_get_seconds() - cur->start_time; + if (!test_and_clear_bit(BTRFS_FS_COMMIT_TRANS, &fs_info->flags) && + cur->state < TRANS_STATE_COMMIT_PREP && + delta < fs_info->commit_interval) { + spin_unlock(&fs_info->trans_lock); + delay -= secs_to_jiffies(delta - 1); + delay = min(delay, + secs_to_jiffies(fs_info->commit_interval)); + 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(BTRFS_FS_ERROR(fs_info))) + btrfs_cleanup_transaction(fs_info); + if (!kthread_should_stop() && + (!btrfs_transaction_blocked(fs_info) || + cannot_commit)) + schedule_timeout_interruptible(delay); + } while (!kthread_should_stop()); + return 0; +} + +/* + * This will find the highest generation in the array of root backups. The + * index of the highest array is returned, or -EINVAL if we can't find + * anything. + * + * We check to make sure the array is valid by comparing the + * generation of the latest root in the array with the generation + * in the super block. If they don't match we pitch it. + */ +static int find_newest_super_backup(struct btrfs_fs_info *info) +{ + const u64 newest_gen = btrfs_super_generation(info->super_copy); + u64 cur; + struct btrfs_root_backup *root_backup; + int i; + + for (i = 0; i < BTRFS_NUM_BACKUP_ROOTS; i++) { + root_backup = info->super_copy->super_roots + i; + cur = btrfs_backup_tree_root_gen(root_backup); + if (cur == newest_gen) + return i; + } + + return -EINVAL; +} + +/* + * copy all the root pointers into the super backup array. + * this will bump the backup pointer by one when it is + * done + */ +static int backup_super_roots(struct btrfs_fs_info *info) +{ + const int next_backup = info->backup_root_index; + struct btrfs_root_backup *root_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)); + + if (!btrfs_fs_incompat(info, EXTENT_TREE_V2)) { + struct btrfs_root *extent_root = btrfs_extent_root(info, 0); + struct btrfs_root *csum_root = btrfs_csum_root(info, 0); + + if (unlikely(!extent_root)) { + btrfs_err(info, "missing extent root for extent at bytenr 0"); + return -EUCLEAN; + } + if (unlikely(!csum_root)) { + btrfs_err(info, "missing csum root for extent at bytenr 0"); + return -EUCLEAN; + } + + btrfs_set_backup_extent_root(root_backup, + extent_root->node->start); + btrfs_set_backup_extent_root_gen(root_backup, + btrfs_header_generation(extent_root->node)); + btrfs_set_backup_extent_root_level(root_backup, + btrfs_header_level(extent_root->node)); + + btrfs_set_backup_csum_root(root_backup, csum_root->node->start); + btrfs_set_backup_csum_root_gen(root_backup, + btrfs_header_generation(csum_root->node)); + btrfs_set_backup_csum_root_level(root_backup, + btrfs_header_level(csum_root->node)); + } + + /* + * 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_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); + + return 0; +} + +/* + * Reads a backup root based on the passed priority. Prio 0 is the newest, prio + * 1/2/3 are 2nd newest/3rd newest/4th (oldest) backup roots + * + * @fs_info: filesystem whose backup roots need to be read + * @priority: priority of backup root required + * + * Returns backup root index on success and -EINVAL otherwise. + */ +static int read_backup_root(struct btrfs_fs_info *fs_info, u8 priority) +{ + int backup_index = find_newest_super_backup(fs_info); + struct btrfs_super_block *super = fs_info->super_copy; + struct btrfs_root_backup *root_backup; + + if (priority < BTRFS_NUM_BACKUP_ROOTS && backup_index >= 0) { + if (priority == 0) + return backup_index; + + backup_index = backup_index + BTRFS_NUM_BACKUP_ROOTS - priority; + backup_index %= BTRFS_NUM_BACKUP_ROOTS; + } else { + return -EINVAL; + } + + root_backup = super->super_roots + backup_index; + + btrfs_set_super_generation(super, + btrfs_backup_tree_root_gen(root_backup)); + btrfs_set_super_root(super, btrfs_backup_tree_root(root_backup)); + btrfs_set_super_root_level(super, + btrfs_backup_tree_root_level(root_backup)); + btrfs_set_super_bytes_used(super, btrfs_backup_bytes_used(root_backup)); + + /* + * Fixme: the total bytes and num_devices need to match or we should + * need a fsck + */ + btrfs_set_super_total_bytes(super, btrfs_backup_total_bytes(root_backup)); + btrfs_set_super_num_devices(super, btrfs_backup_num_devices(root_backup)); + + return backup_index; +} + +/* helper to cleanup workers */ +static void btrfs_stop_all_workers(struct btrfs_fs_info *fs_info) +{ + if (fs_info->fixup_workers) + destroy_workqueue(fs_info->fixup_workers); + btrfs_destroy_workqueue(fs_info->delalloc_workers); + btrfs_destroy_workqueue(fs_info->workers); + if (fs_info->endio_workers) + destroy_workqueue(fs_info->endio_workers); + if (fs_info->rmw_workers) + destroy_workqueue(fs_info->rmw_workers); + btrfs_destroy_workqueue(fs_info->endio_write_workers); + btrfs_destroy_workqueue(fs_info->endio_freespace_worker); + btrfs_destroy_workqueue(fs_info->delayed_workers); + btrfs_destroy_workqueue(fs_info->caching_workers); + btrfs_destroy_workqueue(fs_info->flush_workers); + btrfs_destroy_workqueue(fs_info->qgroup_rescan_workers); + if (fs_info->discard_ctl.discard_workers) + destroy_workqueue(fs_info->discard_ctl.discard_workers); + /* + * Now that all other work queues are destroyed, we can safely destroy + * the queues used for metadata I/O, since tasks from those other work + * queues can do metadata I/O operations. + */ + if (fs_info->endio_meta_workers) + destroy_workqueue(fs_info->endio_meta_workers); +} + +static void free_root_extent_buffers(struct btrfs_root *root) +{ + if (root) { + free_extent_buffer(root->node); + free_extent_buffer(root->commit_root); + root->node = NULL; + root->commit_root = NULL; + } +} + +static void free_global_root_pointers(struct btrfs_fs_info *fs_info) +{ + struct btrfs_root *root, *tmp; + + rbtree_postorder_for_each_entry_safe(root, tmp, + &fs_info->global_root_tree, + rb_node) + free_root_extent_buffers(root); +} + +/* helper to cleanup tree roots */ +static void free_root_pointers(struct btrfs_fs_info *info, bool free_chunk_root) +{ + free_root_extent_buffers(info->tree_root); + + free_global_root_pointers(info); + free_root_extent_buffers(info->dev_root); + free_root_extent_buffers(info->quota_root); + free_root_extent_buffers(info->uuid_root); + free_root_extent_buffers(info->fs_root); + free_root_extent_buffers(info->data_reloc_root); + free_root_extent_buffers(info->block_group_root); + free_root_extent_buffers(info->stripe_root); + free_root_extent_buffers(info->remap_root); + if (free_chunk_root) + free_root_extent_buffers(info->chunk_root); +} + +void btrfs_put_root(struct btrfs_root *root) +{ + if (!root) + return; + + if (refcount_dec_and_test(&root->refs)) { + if (WARN_ON(!xa_empty(&root->inodes))) + xa_destroy(&root->inodes); + if (WARN_ON(!xa_empty(&root->delayed_nodes))) + xa_destroy(&root->delayed_nodes); + WARN_ON(test_bit(BTRFS_ROOT_DEAD_RELOC_TREE, &root->state)); + if (root->anon_dev) + free_anon_bdev(root->anon_dev); + free_root_extent_buffers(root); +#ifdef CONFIG_BTRFS_DEBUG + spin_lock(&root->fs_info->fs_roots_radix_lock); + list_del_init(&root->leak_list); + spin_unlock(&root->fs_info->fs_roots_radix_lock); +#endif + kfree(root); + } +} + +void btrfs_free_fs_roots(struct btrfs_fs_info *fs_info) +{ + int ret; + struct btrfs_root *gang[8]; + int i; + + while (!list_empty(&fs_info->dead_roots)) { + gang[0] = list_first_entry(&fs_info->dead_roots, + struct btrfs_root, root_list); + list_del(&gang[0]->root_list); + + if (test_bit(BTRFS_ROOT_IN_RADIX, &gang[0]->state)) + btrfs_drop_and_free_fs_root(fs_info, gang[0]); + btrfs_put_root(gang[0]); + } + + while (1) { + ret = radix_tree_gang_lookup(&fs_info->fs_roots_radix, + (void **)gang, 0, + ARRAY_SIZE(gang)); + if (!ret) + break; + for (i = 0; i < ret; i++) + btrfs_drop_and_free_fs_root(fs_info, gang[i]); + } +} + +static void btrfs_init_scrub(struct btrfs_fs_info *fs_info) +{ + mutex_init(&fs_info->scrub_lock); + atomic_set(&fs_info->scrubs_running, 0); + atomic_set(&fs_info->scrub_pause_req, 0); + atomic_set(&fs_info->scrubs_paused, 0); + atomic_set(&fs_info->scrub_cancel_req, 0); + init_waitqueue_head(&fs_info->scrub_pause_wait); + refcount_set(&fs_info->scrub_workers_refcnt, 0); +} + +static void btrfs_init_balance(struct btrfs_fs_info *fs_info) +{ + spin_lock_init(&fs_info->balance_lock); + mutex_init(&fs_info->balance_mutex); + atomic_set(&fs_info->balance_pause_req, 0); + atomic_set(&fs_info->balance_cancel_req, 0); + fs_info->balance_ctl = NULL; + init_waitqueue_head(&fs_info->balance_wait_q); + atomic_set(&fs_info->reloc_cancel_req, 0); +} + +static int btrfs_init_btree_inode(struct super_block *sb) +{ + struct btrfs_fs_info *fs_info = btrfs_sb(sb); + unsigned long hash = btrfs_inode_hash(BTRFS_BTREE_INODE_OBJECTID, + fs_info->tree_root); + struct inode *inode; + + inode = new_inode(sb); + if (!inode) + return -ENOMEM; + + btrfs_set_inode_number(BTRFS_I(inode), 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; + mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS); + + btrfs_extent_io_tree_init(fs_info, &BTRFS_I(inode)->io_tree, + IO_TREE_BTREE_INODE_IO); + btrfs_extent_map_tree_init(&BTRFS_I(inode)->extent_tree); + + BTRFS_I(inode)->root = btrfs_grab_root(fs_info->tree_root); + set_bit(BTRFS_INODE_DUMMY, &BTRFS_I(inode)->runtime_flags); + __insert_inode_hash(inode, hash); + set_bit(AS_KERNEL_FILE, &inode->i_mapping->flags); + fs_info->btree_inode = inode; + + return 0; +} + +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_rescan_running = false; + fs_info->qgroup_drop_subtree_thres = BTRFS_QGROUP_DROP_SUBTREE_THRES_DEFAULT; + mutex_init(&fs_info->qgroup_rescan_lock); +} + +static int btrfs_init_workqueues(struct btrfs_fs_info *fs_info) +{ + u32 max_active = fs_info->thread_pool_size; + unsigned int flags = WQ_MEM_RECLAIM | WQ_FREEZABLE | WQ_UNBOUND; + unsigned int ordered_flags = WQ_MEM_RECLAIM | WQ_FREEZABLE; + + fs_info->workers = + btrfs_alloc_workqueue(fs_info, "worker", flags, max_active, 16); + + fs_info->delalloc_workers = + btrfs_alloc_workqueue(fs_info, "delalloc", + flags, max_active, 2); + + fs_info->flush_workers = + btrfs_alloc_workqueue(fs_info, "flush_delalloc", + flags, max_active, 0); + + fs_info->caching_workers = + btrfs_alloc_workqueue(fs_info, "cache", flags, max_active, 0); + + fs_info->fixup_workers = + alloc_ordered_workqueue("btrfs-fixup", ordered_flags); + + fs_info->endio_workers = + alloc_workqueue("btrfs-endio", flags, max_active); + fs_info->endio_meta_workers = + alloc_workqueue("btrfs-endio-meta", flags, max_active); + fs_info->rmw_workers = alloc_workqueue("btrfs-rmw", flags, max_active); + fs_info->endio_write_workers = + btrfs_alloc_workqueue(fs_info, "endio-write", flags, + max_active, 2); + fs_info->endio_freespace_worker = + btrfs_alloc_workqueue(fs_info, "freespace-write", flags, + max_active, 0); + fs_info->delayed_workers = + btrfs_alloc_workqueue(fs_info, "delayed-meta", flags, + max_active, 0); + fs_info->qgroup_rescan_workers = + btrfs_alloc_ordered_workqueue(fs_info, "qgroup-rescan", + ordered_flags); + fs_info->discard_ctl.discard_workers = + alloc_ordered_workqueue("btrfs-discard", WQ_FREEZABLE); + + if (!(fs_info->workers && + fs_info->delalloc_workers && fs_info->flush_workers && + fs_info->endio_workers && fs_info->endio_meta_workers && + fs_info->endio_write_workers && + fs_info->endio_freespace_worker && fs_info->rmw_workers && + fs_info->caching_workers && fs_info->fixup_workers && + fs_info->delayed_workers && fs_info->qgroup_rescan_workers && + fs_info->discard_ctl.discard_workers)) { + return -ENOMEM; + } + + return 0; +} + +static void btrfs_init_csum_hash(struct btrfs_fs_info *fs_info, u16 csum_type) +{ + /* Check if the checksum implementation is a fast accelerated one. */ + switch (csum_type) { + case BTRFS_CSUM_TYPE_CRC32: + if (crc32_optimizations() & CRC32C_OPTIMIZATION) + set_bit(BTRFS_FS_CSUM_IMPL_FAST, &fs_info->flags); + break; + case BTRFS_CSUM_TYPE_XXHASH: + set_bit(BTRFS_FS_CSUM_IMPL_FAST, &fs_info->flags); + break; + default: + break; + } + + btrfs_info(fs_info, "using %s checksum algorithm", + btrfs_super_csum_name(csum_type)); +} + +static int btrfs_replay_log(struct btrfs_fs_info *fs_info, + struct btrfs_fs_devices *fs_devices) +{ + int ret; + struct btrfs_tree_parent_check check = { 0 }; + 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 (unlikely(fs_devices->rw_devices == 0)) { + btrfs_err(fs_info, "log replay required on RO media"); + return -EIO; + } + + log_tree_root = btrfs_alloc_root(fs_info, BTRFS_TREE_LOG_OBJECTID, + GFP_KERNEL); + if (!log_tree_root) + return -ENOMEM; + + check.level = level; + check.transid = fs_info->generation + 1; + check.owner_root = BTRFS_TREE_LOG_OBJECTID; + log_tree_root->node = read_tree_block(fs_info, bytenr, &check); + if (IS_ERR(log_tree_root->node)) { + ret = PTR_ERR(log_tree_root->node); + log_tree_root->node = NULL; + btrfs_err(fs_info, "failed to read log tree with error: %pe", ERR_PTR(ret)); + btrfs_put_root(log_tree_root); + return ret; + } + + /* returns with log_tree_root freed on success */ + ret = btrfs_recover_log_trees(log_tree_root); + btrfs_put_root(log_tree_root); + if (unlikely(ret)) { + ASSERT(BTRFS_FS_ERROR(fs_info) != 0); + btrfs_err(fs_info, "failed to recover log trees with error: %pe", ERR_PTR(ret)); + return ret; + } + + if (sb_rdonly(fs_info->sb)) { + ret = btrfs_commit_super(fs_info); + if (ret) + return ret; + } + + return 0; +} + +static int load_global_roots_objectid(struct btrfs_root *tree_root, + struct btrfs_path *path, u64 objectid, + const char *name) +{ + struct btrfs_fs_info *fs_info = tree_root->fs_info; + struct btrfs_root *root; + u64 max_global_id = 0; + int ret; + struct btrfs_key key = { + .objectid = objectid, + .type = BTRFS_ROOT_ITEM_KEY, + .offset = 0, + }; + bool found = false; + + /* If we have IGNOREDATACSUMS skip loading these roots. */ + if (objectid == BTRFS_CSUM_TREE_OBJECTID && + btrfs_test_opt(fs_info, IGNOREDATACSUMS)) { + set_bit(BTRFS_FS_STATE_NO_DATA_CSUMS, &fs_info->fs_state); + return 0; + } + + while (1) { + ret = btrfs_search_slot(NULL, tree_root, &key, path, 0, 0); + if (ret < 0) + break; + + if (path->slots[0] >= btrfs_header_nritems(path->nodes[0])) { + ret = btrfs_next_leaf(tree_root, path); + if (ret) { + if (ret > 0) + ret = 0; + break; + } + } + ret = 0; + + btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); + if (key.objectid != objectid) + break; + btrfs_release_path(path); + + /* + * Just worry about this for extent tree, it'll be the same for + * everybody. + */ + if (objectid == BTRFS_EXTENT_TREE_OBJECTID) + max_global_id = max(max_global_id, key.offset); + + found = true; + root = read_tree_root_path(tree_root, path, &key); + if (IS_ERR(root)) { + ret = PTR_ERR(root); + break; + } + set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state); + ret = btrfs_global_root_insert(root); + if (ret) { + btrfs_put_root(root); + break; + } + key.offset++; + } + btrfs_release_path(path); + + if (objectid == BTRFS_EXTENT_TREE_OBJECTID) + fs_info->nr_global_roots = max_global_id + 1; + + if (!found || ret) { + if (objectid == BTRFS_CSUM_TREE_OBJECTID) + set_bit(BTRFS_FS_STATE_NO_DATA_CSUMS, &fs_info->fs_state); + + if (!btrfs_test_opt(fs_info, IGNOREBADROOTS)) + ret = ret ? ret : -ENOENT; + else + ret = 0; + btrfs_err(fs_info, "failed to load root %s", name); + } + return ret; +} + +static int load_global_roots(struct btrfs_root *tree_root) +{ + BTRFS_PATH_AUTO_FREE(path); + int ret; + + path = btrfs_alloc_path(); + if (!path) + return -ENOMEM; + + ret = load_global_roots_objectid(tree_root, path, + BTRFS_EXTENT_TREE_OBJECTID, "extent"); + if (ret) + return ret; + ret = load_global_roots_objectid(tree_root, path, + BTRFS_CSUM_TREE_OBJECTID, "csum"); + if (ret) + return ret; + if (!btrfs_fs_compat_ro(tree_root->fs_info, FREE_SPACE_TREE)) + return ret; + + return load_global_roots_objectid(tree_root, path, + BTRFS_FREE_SPACE_TREE_OBJECTID, + "free space"); +} + +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; + + ASSERT(fs_info->tree_root); + + ret = load_global_roots(tree_root); + if (ret) + return ret; + + location.type = BTRFS_ROOT_ITEM_KEY; + location.offset = 0; + + if (btrfs_fs_compat_ro(fs_info, BLOCK_GROUP_TREE)) { + location.objectid = BTRFS_BLOCK_GROUP_TREE_OBJECTID; + root = btrfs_read_tree_root(tree_root, &location); + if (IS_ERR(root)) { + if (!btrfs_test_opt(fs_info, IGNOREBADROOTS)) { + ret = PTR_ERR(root); + goto out; + } + } else { + set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state); + fs_info->block_group_root = root; + } + } + + location.objectid = BTRFS_DEV_TREE_OBJECTID; + root = btrfs_read_tree_root(tree_root, &location); + if (IS_ERR(root)) { + if (!btrfs_test_opt(fs_info, IGNOREBADROOTS)) { + ret = PTR_ERR(root); + goto out; + } + } else { + set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state); + fs_info->dev_root = root; + } + /* Initialize fs_info for all devices in any case */ + ret = btrfs_init_devices_late(fs_info); + if (ret) + goto out; + + if (btrfs_fs_incompat(fs_info, REMAP_TREE)) { + /* The remap_root has already been loaded in load_important_roots(). */ + root = fs_info->remap_root; + + set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state); + + root->root_key.objectid = BTRFS_REMAP_TREE_OBJECTID; + root->root_key.type = BTRFS_ROOT_ITEM_KEY; + root->root_key.offset = 0; + + /* Check that data reloc tree doesn't also exist. */ + location.objectid = BTRFS_DATA_RELOC_TREE_OBJECTID; + root = btrfs_read_tree_root(fs_info->tree_root, &location); + if (!IS_ERR(root)) { + btrfs_err(fs_info, "data reloc tree exists when remap-tree enabled"); + btrfs_put_root(root); + return -EIO; + } else if (PTR_ERR(root) != -ENOENT) { + btrfs_warn(fs_info, "error %ld when checking for data reloc tree", + PTR_ERR(root)); + } + } else { + /* + * This tree can share blocks with some other fs tree during + * relocation and we need a proper setup by btrfs_get_fs_root(). + */ + root = btrfs_get_fs_root(tree_root->fs_info, + BTRFS_DATA_RELOC_TREE_OBJECTID, true); + if (IS_ERR(root)) { + if (!btrfs_test_opt(fs_info, IGNOREBADROOTS)) { + location.objectid = BTRFS_DATA_RELOC_TREE_OBJECTID; + ret = PTR_ERR(root); + goto out; + } + } else { + set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state); + fs_info->data_reloc_root = root; + } + } + + location.objectid = BTRFS_QUOTA_TREE_OBJECTID; + root = btrfs_read_tree_root(tree_root, &location); + if (!IS_ERR(root)) { + set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state); + fs_info->quota_root = root; + } + + location.objectid = BTRFS_UUID_TREE_OBJECTID; + root = btrfs_read_tree_root(tree_root, &location); + if (IS_ERR(root)) { + if (!btrfs_test_opt(fs_info, IGNOREBADROOTS)) { + ret = PTR_ERR(root); + if (ret != -ENOENT) + goto out; + } + } else { + set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state); + fs_info->uuid_root = root; + } + + if (btrfs_fs_incompat(fs_info, RAID_STRIPE_TREE)) { + location.objectid = BTRFS_RAID_STRIPE_TREE_OBJECTID; + root = btrfs_read_tree_root(tree_root, &location); + if (IS_ERR(root)) { + if (!btrfs_test_opt(fs_info, IGNOREBADROOTS)) { + ret = PTR_ERR(root); + goto out; + } + } else { + set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state); + fs_info->stripe_root = root; + } + } + + return 0; +out: + btrfs_warn(fs_info, "failed to read root (objectid=%llu): %pe", + location.objectid, ERR_PTR(ret)); + return ret; +} + +static int validate_sys_chunk_array(const struct btrfs_fs_info *fs_info, + const struct btrfs_super_block *sb) +{ + unsigned int cur = 0; /* Offset inside the sys chunk array */ + /* + * At sb read time, fs_info is not fully initialized. Thus we have + * to use super block sectorsize, which should have been validated. + */ + const u32 sectorsize = btrfs_super_sectorsize(sb); + u32 sys_array_size = btrfs_super_sys_array_size(sb); + + if (unlikely(sys_array_size > BTRFS_SYSTEM_CHUNK_ARRAY_SIZE)) { + btrfs_err(fs_info, "system chunk array too big %u > %u", + sys_array_size, BTRFS_SYSTEM_CHUNK_ARRAY_SIZE); + return -EUCLEAN; + } + + /* It must hold at least one key and one chunk. */ + if (unlikely(sys_array_size < sizeof(struct btrfs_disk_key) + + sizeof(struct btrfs_chunk))) { + btrfs_err(fs_info, "system chunk array too small %u < %zu", + sys_array_size, + sizeof(struct btrfs_disk_key) + sizeof(struct btrfs_chunk)); + return -EUCLEAN; + } + + while (cur < sys_array_size) { + struct btrfs_disk_key *disk_key; + struct btrfs_chunk *chunk; + struct btrfs_key key; + u64 type; + u16 num_stripes; + u32 len; + int ret; + + disk_key = (struct btrfs_disk_key *)(sb->sys_chunk_array + cur); + len = sizeof(*disk_key); + + if (unlikely(cur + len > sys_array_size)) + goto short_read; + cur += len; + + btrfs_disk_key_to_cpu(&key, disk_key); + if (unlikely(key.type != BTRFS_CHUNK_ITEM_KEY)) { + btrfs_err(fs_info, + "unexpected item type %u in sys_array at offset %u", + key.type, cur); + return -EUCLEAN; + } + chunk = (struct btrfs_chunk *)(sb->sys_chunk_array + cur); + num_stripes = btrfs_stack_chunk_num_stripes(chunk); + if (unlikely(cur + btrfs_chunk_item_size(num_stripes) > sys_array_size)) + goto short_read; + type = btrfs_stack_chunk_type(chunk); + if (unlikely(!(type & BTRFS_BLOCK_GROUP_SYSTEM))) { + btrfs_err(fs_info, + "invalid chunk type %llu in sys_array at offset %u", + type, cur); + return -EUCLEAN; + } + ret = btrfs_check_chunk_valid(fs_info, NULL, chunk, key.offset, + sectorsize); + if (ret < 0) + return ret; + cur += btrfs_chunk_item_size(num_stripes); + } + return 0; +short_read: + btrfs_err(fs_info, + "super block sys chunk array short read, cur=%u sys_array_size=%u", + cur, sys_array_size); + return -EUCLEAN; +} + +/* + * 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 + */ +int btrfs_validate_super(const struct btrfs_fs_info *fs_info, + const struct btrfs_super_block *sb, int mirror_num) +{ + const u32 nodesize = btrfs_super_nodesize(sb); + const u32 sectorsize = btrfs_super_sectorsize(sb); + int ret = 0; + const bool ignore_flags = btrfs_test_opt(fs_info, IGNORESUPERFLAGS); + + if (unlikely(btrfs_super_magic(sb) != BTRFS_MAGIC)) { + btrfs_err(fs_info, "no valid FS found"); + ret = -EINVAL; + } + if (unlikely(btrfs_super_flags(sb) & ~BTRFS_SUPER_FLAG_SUPP)) { + if (!ignore_flags) { + btrfs_err(fs_info, + "unrecognized or unsupported super flag 0x%llx", + btrfs_super_flags(sb) & ~BTRFS_SUPER_FLAG_SUPP); + ret = -EINVAL; + } else { + btrfs_info(fs_info, + "unrecognized or unsupported super flags: 0x%llx, ignored", + btrfs_super_flags(sb) & ~BTRFS_SUPER_FLAG_SUPP); + } + } + if (unlikely(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 (unlikely(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 (unlikely(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 (unlikely(!is_power_of_2(sectorsize) || sectorsize < BTRFS_MIN_BLOCKSIZE || + sectorsize > BTRFS_MAX_METADATA_BLOCKSIZE)) { + btrfs_err(fs_info, "invalid sectorsize %u", sectorsize); + ret = -EINVAL; + } + + if (unlikely(!btrfs_supported_blocksize(sectorsize))) { + btrfs_err(fs_info, + "sectorsize %u not yet supported for page size %lu", + sectorsize, PAGE_SIZE); + ret = -EINVAL; + } + + if (unlikely(!is_power_of_2(nodesize) || nodesize < sectorsize || + nodesize > BTRFS_MAX_METADATA_BLOCKSIZE)) { + btrfs_err(fs_info, "invalid nodesize %u", nodesize); + ret = -EINVAL; + } + if (unlikely(nodesize != le32_to_cpu(sb->__unused_leafsize))) { + btrfs_err(fs_info, "invalid leafsize %u, should be %u", + le32_to_cpu(sb->__unused_leafsize), nodesize); + ret = -EINVAL; + } + + /* Root alignment check */ + if (unlikely(!IS_ALIGNED(btrfs_super_root(sb), sectorsize))) { + btrfs_err(fs_info, "tree_root block unaligned: %llu", + btrfs_super_root(sb)); + ret = -EINVAL; + } + if (unlikely(!IS_ALIGNED(btrfs_super_chunk_root(sb), sectorsize))) { + btrfs_err(fs_info, "chunk_root block unaligned: %llu", + btrfs_super_chunk_root(sb)); + ret = -EINVAL; + } + if (unlikely(!IS_ALIGNED(btrfs_super_log_root(sb), sectorsize))) { + btrfs_err(fs_info, "log_root block unaligned: %llu", + btrfs_super_log_root(sb)); + ret = -EINVAL; + } + + if (unlikely(!fs_info->fs_devices->temp_fsid && + memcmp(fs_info->fs_devices->fsid, sb->fsid, BTRFS_FSID_SIZE) != 0)) { + btrfs_err(fs_info, + "superblock fsid doesn't match fsid of fs_devices: %pU != %pU", + sb->fsid, fs_info->fs_devices->fsid); + ret = -EINVAL; + } + + if (unlikely(memcmp(fs_info->fs_devices->metadata_uuid, btrfs_sb_fsid_ptr(sb), + BTRFS_FSID_SIZE) != 0)) { + btrfs_err(fs_info, +"superblock metadata_uuid doesn't match metadata uuid of fs_devices: %pU != %pU", + btrfs_sb_fsid_ptr(sb), fs_info->fs_devices->metadata_uuid); + ret = -EINVAL; + } + + if (unlikely(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; + } + + /* + * Artificial requirement for block-group-tree to force newer features + * (free-space-tree, no-holes) so the test matrix is smaller. + */ + if (unlikely(btrfs_fs_compat_ro(fs_info, BLOCK_GROUP_TREE) && + (!btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE_VALID) || + !btrfs_fs_incompat(fs_info, NO_HOLES)))) { + btrfs_err(fs_info, + "block-group-tree feature requires free-space-tree and no-holes"); + ret = -EINVAL; + } + + if (btrfs_fs_incompat(fs_info, REMAP_TREE)) { + /* + * Reduce test matrix for remap tree by requiring block-group-tree + * and no-holes. Free-space-tree is a hard requirement. + */ + if (unlikely(!btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE_VALID) || + !btrfs_fs_incompat(fs_info, NO_HOLES) || + !btrfs_fs_compat_ro(fs_info, BLOCK_GROUP_TREE))) { + btrfs_err(fs_info, +"remap-tree feature requires free-space-tree, no-holes, and block-group-tree"); + ret = -EINVAL; + } + + if (unlikely(btrfs_fs_incompat(fs_info, MIXED_GROUPS))) { + btrfs_err(fs_info, "remap-tree not supported with mixed-bg"); + ret = -EINVAL; + } + + if (unlikely(btrfs_fs_incompat(fs_info, ZONED))) { + btrfs_err(fs_info, "remap-tree not supported with zoned devices"); + ret = -EINVAL; + } + + if (unlikely(sectorsize > PAGE_SIZE)) { + btrfs_err(fs_info, "remap-tree not supported when block size > page size"); + ret = -EINVAL; + } + } + + /* + * Hint to catch really bogus numbers, bitflips or so, more exact checks are + * done later + */ + if (unlikely(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 (unlikely(!is_power_of_2(btrfs_super_stripesize(sb)))) { + btrfs_err(fs_info, "invalid stripesize %u", + btrfs_super_stripesize(sb)); + ret = -EINVAL; + } + if (unlikely(btrfs_super_num_devices(sb) > (1UL << 31))) + btrfs_warn(fs_info, "suspicious number of devices: %llu", + btrfs_super_num_devices(sb)); + if (unlikely(btrfs_super_num_devices(sb) == 0)) { + btrfs_err(fs_info, "number of devices is 0"); + ret = -EINVAL; + } + + if (unlikely(mirror_num >= 0 && + btrfs_super_bytenr(sb) != btrfs_sb_offset(mirror_num))) { + btrfs_err(fs_info, "super offset mismatch %llu != %llu", + btrfs_super_bytenr(sb), btrfs_sb_offset(mirror_num)); + ret = -EINVAL; + } + + if (unlikely(ret)) + return ret; + + ret = validate_sys_chunk_array(fs_info, sb); + + /* + * 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 (unlikely(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 (unlikely(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 btrfs_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 = btrfs_validate_super(fs_info, sb, -1); + if (unlikely(ret < 0)) + goto out; + if (unlikely(!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 (unlikely(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 (unlikely(ret < 0)) + btrfs_err(fs_info, + "super block corruption detected before writing it to disk"); + return ret; +} + +static int load_super_root(struct btrfs_root *root, u64 bytenr, u64 gen, int level) +{ + struct btrfs_tree_parent_check check = { + .level = level, + .transid = gen, + .owner_root = btrfs_root_id(root) + }; + int ret = 0; + + root->node = read_tree_block(root->fs_info, bytenr, &check); + if (IS_ERR(root->node)) { + ret = PTR_ERR(root->node); + root->node = NULL; + return ret; + } + + btrfs_set_root_node(&root->root_item, root->node); + root->commit_root = btrfs_root_node(root); + btrfs_set_root_refs(&root->root_item, 1); + return ret; +} + +static int load_important_roots(struct btrfs_fs_info *fs_info) +{ + struct btrfs_super_block *sb = fs_info->super_copy; + u64 gen, bytenr; + int level, ret; + + bytenr = btrfs_super_root(sb); + gen = btrfs_super_generation(sb); + level = btrfs_super_root_level(sb); + ret = load_super_root(fs_info->tree_root, bytenr, gen, level); + if (ret) { + btrfs_warn(fs_info, "couldn't read tree root"); + return ret; + } + + if (btrfs_fs_incompat(fs_info, REMAP_TREE)) { + bytenr = btrfs_super_remap_root(sb); + gen = btrfs_super_remap_root_generation(sb); + level = btrfs_super_remap_root_level(sb); + ret = load_super_root(fs_info->remap_root, bytenr, gen, level); + if (ret) { + btrfs_warn(fs_info, "couldn't read remap root"); + return ret; + } + } + + return 0; +} + +static int __cold init_tree_roots(struct btrfs_fs_info *fs_info) +{ + int backup_index = find_newest_super_backup(fs_info); + struct btrfs_super_block *sb = fs_info->super_copy; + struct btrfs_root *tree_root = fs_info->tree_root; + bool handle_error = false; + int ret = 0; + int i; + + for (i = 0; i < BTRFS_NUM_BACKUP_ROOTS; i++) { + if (handle_error) { + if (!IS_ERR(tree_root->node)) + free_extent_buffer(tree_root->node); + tree_root->node = NULL; + + if (!btrfs_test_opt(fs_info, USEBACKUPROOT)) + break; + + free_root_pointers(fs_info, 0); + + /* + * Don't use the log in recovery mode, it won't be + * valid + */ + btrfs_set_super_log_root(sb, 0); + + btrfs_warn(fs_info, "try to load backup roots slot %d", i); + ret = read_backup_root(fs_info, i); + backup_index = ret; + if (ret < 0) + return ret; + } + + ret = load_important_roots(fs_info); + if (ret) { + handle_error = true; + continue; + } + + /* + * No need to hold btrfs_root::objectid_mutex since the fs + * hasn't been fully initialised and we are the only user + */ + ret = btrfs_init_root_free_objectid(tree_root); + if (ret < 0) { + handle_error = true; + continue; + } + + ASSERT(tree_root->free_objectid <= BTRFS_LAST_FREE_OBJECTID); + + ret = btrfs_read_roots(fs_info); + if (ret < 0) { + handle_error = true; + continue; + } + + /* All successful */ + fs_info->generation = btrfs_header_generation(tree_root->node); + btrfs_set_last_trans_committed(fs_info, fs_info->generation); + fs_info->last_reloc_trans = 0; + + /* Always begin writing backup roots after the one being used */ + if (backup_index < 0) { + fs_info->backup_root_index = 0; + } else { + fs_info->backup_root_index = backup_index + 1; + fs_info->backup_root_index %= BTRFS_NUM_BACKUP_ROOTS; + } + break; + } + + return ret; +} + +/* + * Lockdep gets confused between our buffer_tree which requires IRQ locking because + * we modify marks in the IRQ context, and our delayed inode xarray which doesn't + * have these requirements. Use a class key so lockdep doesn't get them mixed up. + */ +static struct lock_class_key buffer_xa_class; + +void btrfs_init_fs_info(struct btrfs_fs_info *fs_info) +{ + INIT_RADIX_TREE(&fs_info->fs_roots_radix, GFP_ATOMIC); + + /* Use the same flags as mapping->i_pages. */ + xa_init_flags(&fs_info->buffer_tree, XA_FLAGS_LOCK_IRQ | XA_FLAGS_ACCOUNT); + lockdep_set_class(&fs_info->buffer_tree.xa_lock, &buffer_xa_class); + + 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->unused_bgs_lock); + spin_lock_init(&fs_info->treelog_bg_lock); + spin_lock_init(&fs_info->zone_active_bgs_lock); + spin_lock_init(&fs_info->relocation_bg_lock); + rwlock_init(&fs_info->tree_mod_log_lock); + rwlock_init(&fs_info->global_root_lock); + mutex_init(&fs_info->unused_bg_unpin_mutex); + mutex_init(&fs_info->reclaim_bgs_lock); + mutex_init(&fs_info->reloc_mutex); + spin_lock_init(&fs_info->reloc_ctl_lock); + mutex_init(&fs_info->delalloc_root_mutex); + mutex_init(&fs_info->zoned_meta_io_lock); + mutex_init(&fs_info->zoned_data_reloc_io_lock); + seqlock_init(&fs_info->profiles_lock); + + btrfs_lockdep_init_map(fs_info, btrfs_trans_num_writers); + btrfs_lockdep_init_map(fs_info, btrfs_trans_num_extwriters); + btrfs_lockdep_init_map(fs_info, btrfs_trans_pending_ordered); + btrfs_lockdep_init_map(fs_info, btrfs_ordered_extent); + btrfs_state_lockdep_init_map(fs_info, btrfs_trans_commit_prep, + BTRFS_LOCKDEP_TRANS_COMMIT_PREP); + btrfs_state_lockdep_init_map(fs_info, btrfs_trans_unblocked, + BTRFS_LOCKDEP_TRANS_UNBLOCKED); + btrfs_state_lockdep_init_map(fs_info, btrfs_trans_super_committed, + BTRFS_LOCKDEP_TRANS_SUPER_COMMITTED); + btrfs_state_lockdep_init_map(fs_info, btrfs_trans_completed, + BTRFS_LOCKDEP_TRANS_COMPLETED); + + INIT_LIST_HEAD(&fs_info->dirty_cowonly_roots); + INIT_LIST_HEAD(&fs_info->space_info); + INIT_LIST_HEAD(&fs_info->tree_mod_seq_list); + INIT_LIST_HEAD(&fs_info->unused_bgs); + INIT_LIST_HEAD(&fs_info->reclaim_bgs); + INIT_LIST_HEAD(&fs_info->fully_remapped_bgs); + INIT_LIST_HEAD(&fs_info->zone_active_bgs); +#ifdef CONFIG_BTRFS_DEBUG + INIT_LIST_HEAD(&fs_info->allocated_roots); + INIT_LIST_HEAD(&fs_info->allocated_ebs); + spin_lock_init(&fs_info->eb_leak_lock); +#endif + fs_info->mapping_tree = RB_ROOT_CACHED; + rwlock_init(&fs_info->mapping_tree_lock); + 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->remap_block_rsv, BTRFS_BLOCK_RSV_REMAP); + btrfs_init_block_rsv(&fs_info->treelog_rsv, BTRFS_BLOCK_RSV_TREELOG); + btrfs_init_block_rsv(&fs_info->empty_block_rsv, BTRFS_BLOCK_RSV_EMPTY); + btrfs_init_block_rsv(&fs_info->delayed_block_rsv, + BTRFS_BLOCK_RSV_DELOPS); + btrfs_init_block_rsv(&fs_info->delayed_refs_rsv, + BTRFS_BLOCK_RSV_DELREFS); + + atomic_set(&fs_info->async_delalloc_pages, 0); + atomic_set(&fs_info->defrag_running, 0); + atomic_set(&fs_info->nr_delayed_iputs, 0); + atomic64_set(&fs_info->tree_mod_seq, 0); + fs_info->global_root_tree = RB_ROOT; + fs_info->max_inline = BTRFS_DEFAULT_MAX_INLINE; + fs_info->metadata_ratio = 0; + fs_info->defrag_inodes = RB_ROOT; + atomic64_set(&fs_info->free_chunk_space, 0); + fs_info->tree_mod_log = RB_ROOT; + fs_info->commit_interval = BTRFS_DEFAULT_COMMIT_INTERVAL; + btrfs_init_ref_verify(fs_info); + + fs_info->thread_pool_size = min_t(unsigned long, + num_online_cpus() + 2, 8); + + INIT_LIST_HEAD(&fs_info->ordered_roots); + spin_lock_init(&fs_info->ordered_root_lock); + + btrfs_init_scrub(fs_info); + btrfs_init_balance(fs_info); + btrfs_init_async_reclaim_work(fs_info); + btrfs_init_extent_map_shrinker_work(fs_info); + + rwlock_init(&fs_info->block_group_cache_lock); + fs_info->block_group_cache_tree = RB_ROOT_CACHED; + + btrfs_extent_io_tree_init(fs_info, &fs_info->excluded_extents, + IO_TREE_FS_EXCLUDED_EXTENTS); + + 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->remap_mutex); + mutex_init(&fs_info->ro_block_group_mutex); + init_rwsem(&fs_info->commit_root_sem); + init_rwsem(&fs_info->cleanup_work_sem); + init_rwsem(&fs_info->subvol_sem); + sema_init(&fs_info->uuid_tree_rescan_sem, 1); + + btrfs_init_dev_replace_locks(fs_info); + btrfs_init_qgroup(fs_info); + btrfs_discard_init(fs_info); + + btrfs_init_free_cluster(&fs_info->meta_alloc_cluster); + btrfs_init_free_cluster(&fs_info->data_alloc_cluster); + + init_waitqueue_head(&fs_info->transaction_throttle); + init_waitqueue_head(&fs_info->transaction_wait); + init_waitqueue_head(&fs_info->transaction_blocked_wait); + init_waitqueue_head(&fs_info->async_submit_wait); + init_waitqueue_head(&fs_info->delayed_iputs_wait); + + /* Usable values until the real ones are cached from the superblock */ + fs_info->nodesize = 4096; + fs_info->sectorsize = 4096; + fs_info->sectorsize_bits = ilog2(4096); + + /* Default compress algorithm when user does -o compress */ + fs_info->compress_type = BTRFS_COMPRESS_ZLIB; + + fs_info->max_extent_size = BTRFS_MAX_EXTENT_SIZE; + + spin_lock_init(&fs_info->swapfile_pins_lock); + fs_info->swapfile_pins = RB_ROOT; + + fs_info->bg_reclaim_threshold = BTRFS_DEFAULT_RECLAIM_THRESH; + INIT_WORK(&fs_info->reclaim_bgs_work, btrfs_reclaim_bgs_work); +} + +static int init_mount_fs_info(struct btrfs_fs_info *fs_info, struct super_block *sb) +{ + int ret; + + fs_info->sb = sb; + /* Temporary fixed values for block size until we read the superblock. */ + sb->s_blocksize = BTRFS_BDEV_BLOCKSIZE; + sb->s_blocksize_bits = blksize_bits(BTRFS_BDEV_BLOCKSIZE); + + ret = percpu_counter_init(&fs_info->ordered_bytes, 0, GFP_KERNEL); + if (ret) + return ret; + + ret = percpu_counter_init(&fs_info->evictable_extent_maps, 0, GFP_KERNEL); + if (ret) + return ret; + + ret = percpu_counter_init(&fs_info->dirty_metadata_bytes, 0, GFP_KERNEL); + if (ret) + return ret; + + ret = percpu_counter_init(&fs_info->stats_read_blocks, 0, GFP_KERNEL); + if (ret) + return ret; + + fs_info->dirty_metadata_batch = PAGE_SIZE * + (1 + ilog2(nr_cpu_ids)); + + ret = percpu_counter_init(&fs_info->delalloc_bytes, 0, GFP_KERNEL); + if (ret) + return ret; + + ret = percpu_counter_init(&fs_info->dev_replace.bio_counter, 0, + GFP_KERNEL); + if (ret) + return ret; + + btrfs_init_delayed_root(&fs_info->delayed_root); + + if (sb_rdonly(sb)) + set_bit(BTRFS_FS_STATE_RO, &fs_info->fs_state); + if (btrfs_test_opt(fs_info, IGNOREMETACSUMS)) + set_bit(BTRFS_FS_STATE_SKIP_META_CSUMS, &fs_info->fs_state); + + return btrfs_alloc_stripe_hash_table(fs_info); +} + +static int btrfs_uuid_rescan_kthread(void *data) +{ + struct btrfs_fs_info *fs_info = data; + int ret; + + /* + * 1st step is to iterate through the existing UUID tree and + * to delete all entries that contain outdated data. + * 2nd step is to add all missing entries to the UUID tree. + */ + ret = btrfs_uuid_tree_iterate(fs_info); + if (ret < 0) { + if (ret != -EINTR) + btrfs_warn(fs_info, "iterating uuid_tree failed %pe", + ERR_PTR(ret)); + up(&fs_info->uuid_tree_rescan_sem); + return ret; + } + return btrfs_uuid_scan_kthread(data); +} + +static int btrfs_check_uuid_tree(struct btrfs_fs_info *fs_info) +{ + struct task_struct *task; + + down(&fs_info->uuid_tree_rescan_sem); + task = kthread_run(btrfs_uuid_rescan_kthread, fs_info, "btrfs-uuid"); + if (IS_ERR(task)) { + /* fs_info->update_uuid_tree_gen remains 0 in all error case */ + up(&fs_info->uuid_tree_rescan_sem); + return PTR_ERR(task); + } + + return 0; +} + +static int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info) +{ + u64 root_objectid = 0; + struct btrfs_root *gang[8]; + int ret = 0; + + while (1) { + unsigned int found; + + spin_lock(&fs_info->fs_roots_radix_lock); + found = radix_tree_gang_lookup(&fs_info->fs_roots_radix, + (void **)gang, root_objectid, + ARRAY_SIZE(gang)); + if (!found) { + spin_unlock(&fs_info->fs_roots_radix_lock); + break; + } + root_objectid = btrfs_root_id(gang[found - 1]) + 1; + + for (int i = 0; i < found; i++) { + /* Avoid to grab roots in dead_roots. */ + if (btrfs_root_refs(&gang[i]->root_item) == 0) { + gang[i] = NULL; + continue; + } + /* Grab all the search result for later use. */ + gang[i] = btrfs_grab_root(gang[i]); + } + spin_unlock(&fs_info->fs_roots_radix_lock); + + for (int i = 0; i < found; i++) { + if (!gang[i]) + continue; + root_objectid = btrfs_root_id(gang[i]); + /* + * Continue to release the remaining roots after the first + * error without cleanup and preserve the first error + * for the return. + */ + if (!ret) + ret = btrfs_orphan_cleanup(gang[i]); + btrfs_put_root(gang[i]); + } + if (ret) + break; + + root_objectid++; + } + return ret; +} + +/* + * Mounting logic specific to read-write file systems. Shared by open_ctree + * and btrfs_remount when remounting from read-only to read-write. + */ +int btrfs_start_pre_rw_mount(struct btrfs_fs_info *fs_info) +{ + int ret; + const bool cache_opt = btrfs_test_opt(fs_info, SPACE_CACHE); + bool rebuild_free_space_tree = false; + + if (btrfs_test_opt(fs_info, CLEAR_CACHE) && + btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE)) { + if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) + btrfs_warn(fs_info, + "'clear_cache' option is ignored with extent tree v2"); + else if (btrfs_fs_incompat(fs_info, REMAP_TREE)) + btrfs_warn(fs_info, "'clear_cache' option is ignored with remap tree"); + else + rebuild_free_space_tree = true; + } else if (btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE) && + !btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE_VALID)) { + btrfs_warn(fs_info, "free space tree is invalid"); + rebuild_free_space_tree = true; + } + + if (rebuild_free_space_tree) { + btrfs_info(fs_info, "rebuilding free space tree"); + ret = btrfs_rebuild_free_space_tree(fs_info); + if (ret) { + btrfs_warn(fs_info, + "failed to rebuild free space tree: %pe", ERR_PTR(ret)); + return ret; + } + } + + if (btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE) && + !btrfs_test_opt(fs_info, FREE_SPACE_TREE)) { + btrfs_info(fs_info, "disabling free space tree"); + ret = btrfs_delete_free_space_tree(fs_info); + if (ret) { + btrfs_warn(fs_info, + "failed to disable free space tree: %pe", ERR_PTR(ret)); + return ret; + } + } + + /* + * Before btrfs-progs v6.16.1 mkfs.btrfs can leave free space entries + * for deleted temporary chunks. Delete them if they exist. + */ + ret = btrfs_delete_orphan_free_space_entries(fs_info); + if (ret < 0) { + btrfs_err(fs_info, "failed to delete orphan free space tree entries: %pe", + ERR_PTR(ret)); + return ret; + } + /* + * btrfs_find_orphan_roots() is responsible for finding all the dead + * roots (with 0 refs), flag them with BTRFS_ROOT_DEAD_TREE and load + * them into the fs_info->fs_roots_radix tree. This must be done before + * calling btrfs_orphan_cleanup() on the tree root. If we don't do it + * first, then btrfs_orphan_cleanup() will delete a dead root's orphan + * item before the root's tree is deleted - this means that if we unmount + * or crash before the deletion completes, on the next mount we will not + * delete what remains of the tree because the orphan item does not + * exists anymore, which is what tells us we have a pending deletion. + */ + ret = btrfs_find_orphan_roots(fs_info); + if (ret) + return ret; + + ret = btrfs_cleanup_fs_roots(fs_info); + if (ret) + 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); + return ret; + } + up_read(&fs_info->cleanup_work_sem); + + mutex_lock(&fs_info->cleaner_mutex); + ret = btrfs_recover_relocation(fs_info); + mutex_unlock(&fs_info->cleaner_mutex); + if (ret < 0) { + btrfs_warn(fs_info, "failed to recover relocation: %pe", ERR_PTR(ret)); + 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: %pe", ERR_PTR(ret)); + return ret; + } + } + + if (cache_opt != btrfs_free_space_cache_v1_active(fs_info)) { + ret = btrfs_set_free_space_cache_v1_active(fs_info, cache_opt); + if (ret) + return ret; + } + + ret = btrfs_resume_balance_async(fs_info); + if (ret) + return ret; + + ret = btrfs_resume_dev_replace_async(fs_info); + if (ret) { + btrfs_warn(fs_info, "failed to resume dev_replace"); + 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 %pe", ERR_PTR(ret)); + return ret; + } + } + + return 0; +} + +/* + * Do various sanity and dependency checks of different features. + * + * @is_rw_mount: If the mount is read-write. + * + * This is the place for less strict checks (like for subpage or artificial + * feature dependencies). + * + * For strict checks or possible corruption detection, see + * btrfs_validate_super(). + * + * This should be called after btrfs_parse_options(), as some mount options + * (space cache related) can modify on-disk format like free space tree and + * screw up certain feature dependencies. + */ +int btrfs_check_features(struct btrfs_fs_info *fs_info, bool is_rw_mount) +{ + struct btrfs_super_block *disk_super = fs_info->super_copy; + u64 incompat = btrfs_super_incompat_flags(disk_super); + const u64 compat_ro = btrfs_super_compat_ro_flags(disk_super); + const u64 compat_ro_unsupp = (compat_ro & ~BTRFS_FEATURE_COMPAT_RO_SUPP); + + if (incompat & ~BTRFS_FEATURE_INCOMPAT_SUPP) { + btrfs_err(fs_info, + "cannot mount because of unknown incompat features (0x%llx)", + incompat & ~BTRFS_FEATURE_INCOMPAT_SUPP); + return -EINVAL; + } + + /* Runtime limitation for mixed block groups. */ + if ((incompat & BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS) && + (fs_info->sectorsize != fs_info->nodesize)) { + btrfs_err(fs_info, +"unequal nodesize/sectorsize (%u != %u) are not allowed for mixed block groups", + fs_info->nodesize, fs_info->sectorsize); + return -EINVAL; + } + + /* Mixed backref is an always-enabled feature. */ + incompat |= BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF; + + /* Set compression related flags just in case. */ + if (fs_info->compress_type == BTRFS_COMPRESS_LZO) + incompat |= BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO; + else if (fs_info->compress_type == BTRFS_COMPRESS_ZSTD) + incompat |= BTRFS_FEATURE_INCOMPAT_COMPRESS_ZSTD; + + /* + * An ancient flag, which should really be marked deprecated. + * Such runtime limitation doesn't really need a incompat flag. + */ + if (btrfs_super_nodesize(disk_super) > PAGE_SIZE) + incompat |= BTRFS_FEATURE_INCOMPAT_BIG_METADATA; + + if (compat_ro_unsupp && is_rw_mount) { + btrfs_err(fs_info, + "cannot mount read-write because of unknown compat_ro features (0x%llx)", + compat_ro_unsupp); + return -EINVAL; + } + + /* + * We have unsupported RO compat features, although RO mounted, we + * should not cause any metadata writes, including log replay. + * Or we could screw up whatever the new feature requires. + */ + if (compat_ro_unsupp && btrfs_super_log_root(disk_super) && + !btrfs_test_opt(fs_info, NOLOGREPLAY)) { + btrfs_err(fs_info, +"cannot replay dirty log with unsupported compat_ro features (0x%llx), try rescue=nologreplay", + compat_ro_unsupp); + return -EINVAL; + } + + /* + * Artificial limitations for block group tree, to force + * block-group-tree to rely on no-holes and free-space-tree. + */ + if (btrfs_fs_compat_ro(fs_info, BLOCK_GROUP_TREE) && + (!btrfs_fs_incompat(fs_info, NO_HOLES) || + !btrfs_test_opt(fs_info, FREE_SPACE_TREE))) { + btrfs_err(fs_info, +"block-group-tree feature requires no-holes and free-space-tree features"); + return -EINVAL; + } + + /* + * Subpage/bs > ps runtime limitation on v1 cache. + * + * V1 space cache still has some hard coded PAGE_SIZE usage, while + * we're already defaulting to v2 cache, no need to bother v1 as it's + * going to be deprecated anyway. + */ + if (fs_info->sectorsize != PAGE_SIZE && btrfs_test_opt(fs_info, SPACE_CACHE)) { + btrfs_warn(fs_info, + "v1 space cache is not supported for page size %lu with sectorsize %u", + PAGE_SIZE, fs_info->sectorsize); + return -EINVAL; + } + + /* This can be called by remount, we need to protect the super block. */ + spin_lock(&fs_info->super_lock); + btrfs_set_super_incompat_flags(disk_super, incompat); + spin_unlock(&fs_info->super_lock); + + return 0; +} + +/* + * Try to wait for any metadata readahead, and invalidate all btree folios. + * + * If the invalidation failed, report any dirty/held extent buffers. + */ +static void invalidate_and_check_btree_folios(struct btrfs_fs_info *fs_info) +{ + unsigned long index = 0; + struct extent_buffer *eb; + int ret; + + ret = invalidate_inode_pages2(fs_info->btree_inode->i_mapping); + if (likely(ret == 0)) + return; + + /* + * Some btree pages can not be invalidated, this happens when some tree + * blocks are still held (either by readahead or some task is holding a ref). + */ + rcu_read_lock(); + xa_for_each(&fs_info->buffer_tree, index, eb) { + unsigned int refs; + + /* Increase the ref so that the eb won't disappear. */ + if (!refcount_inc_not_zero(&eb->refs)) + continue; + rcu_read_unlock(); + + /* Wait for any readahead first. */ + if (test_bit(EXTENT_BUFFER_READING, &eb->bflags)) + wait_on_bit_io(&eb->bflags, EXTENT_BUFFER_READING, + TASK_UNINTERRUPTIBLE); + /* + * We hold the spinlock to make sure above + * EXTENT_BUFFER_READING flag is cleared with the held + * ref dropped. + * Or we can hit a race window and lead to false alerts. + */ + spin_lock(&eb->refs_lock); + refs = refcount_read(&eb->refs); + spin_unlock(&eb->refs_lock); + + /* + * The refs threshold is 2, one held by us at the beginning + * of the loop, one for the ownership in the buffer tree. + */ + if (unlikely(refs > 2 || extent_buffer_under_io(eb))) { + WARN_ON_ONCE(IS_ENABLED(CONFIG_BTRFS_DEBUG)); + btrfs_warn(fs_info, + "unable to release extent buffer %llu owner %llu gen %llu refs %u flags 0x%lx", + eb->start, btrfs_header_owner(eb), + btrfs_header_generation(eb), + refs, eb->bflags); + } + free_extent_buffer(eb); + rcu_read_lock(); + } + rcu_read_unlock(); + invalidate_inode_pages2(fs_info->btree_inode->i_mapping); +} + +static u32 calc_block_max_order(u32 sectorsize_bits) +{ + u32 max_size; + + max_size = min(BTRFS_MAX_BLOCKS_PER_FOLIO << sectorsize_bits, + BTRFS_MAX_FOLIO_SIZE); + return ilog2(round_up(max_size, PAGE_SIZE) >> PAGE_SHIFT); +} + +int __cold open_ctree(struct super_block *sb, struct btrfs_fs_devices *fs_devices) +{ + u32 sectorsize; + u32 nodesize; + u64 generation; + u16 csum_type; + struct btrfs_super_block *disk_super; + struct btrfs_fs_info *fs_info = btrfs_sb(sb); + struct btrfs_root *tree_root; + struct btrfs_root *chunk_root; + struct btrfs_root *remap_root; + int ret; + int level; + + ret = init_mount_fs_info(fs_info, sb); + if (ret) + goto fail; + + /* These need to be init'ed before we start creating inodes and such. */ + tree_root = btrfs_alloc_root(fs_info, BTRFS_ROOT_TREE_OBJECTID, + GFP_KERNEL); + fs_info->tree_root = tree_root; + chunk_root = btrfs_alloc_root(fs_info, BTRFS_CHUNK_TREE_OBJECTID, + GFP_KERNEL); + fs_info->chunk_root = chunk_root; + if (!tree_root || !chunk_root) { + ret = -ENOMEM; + goto fail; + } + + ret = btrfs_init_btree_inode(sb); + if (ret) + goto fail; + + invalidate_bdev(fs_devices->latest_dev->bdev); + + /* + * Read super block and check the signature bytes only + */ + disk_super = btrfs_read_disk_super(fs_devices->latest_dev->bdev, 0, false); + if (IS_ERR(disk_super)) { + ret = PTR_ERR(disk_super); + goto fail_alloc; + } + + btrfs_info(fs_info, "first mount of filesystem %pU", disk_super->fsid); + /* + * Verify the type first, if that or the checksum value are + * corrupted, we'll find out + */ + csum_type = btrfs_super_csum_type(disk_super); + if (!btrfs_supported_super_csum(csum_type)) { + btrfs_err(fs_info, "unsupported checksum algorithm: %u", + csum_type); + ret = -EINVAL; + btrfs_release_disk_super(disk_super); + goto fail_alloc; + } + + fs_info->csum_size = btrfs_super_csum_size(disk_super); + fs_info->csum_type = csum_type; + + btrfs_init_csum_hash(fs_info, csum_type); + + /* + * 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, disk_super)) { + btrfs_err(fs_info, "superblock checksum mismatch"); + ret = -EINVAL; + btrfs_release_disk_super(disk_super); + goto fail_alloc; + } + + /* + * super_copy is zeroed at allocation time and we never touch the + * following bytes up to INFO_SIZE, the checksum is calculated from + * the whole block of INFO_SIZE + */ + memcpy(fs_info->super_copy, disk_super, sizeof(*fs_info->super_copy)); + btrfs_release_disk_super(disk_super); + + disk_super = fs_info->super_copy; + + 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"); + ret = -EINVAL; + goto fail_alloc; + } + + if (!btrfs_super_root(disk_super)) { + btrfs_err(fs_info, "invalid superblock tree root bytenr"); + ret = -EINVAL; + goto fail_alloc; + } + + /* check FS state, whether FS is broken. */ + if (btrfs_super_flags(disk_super) & BTRFS_SUPER_FLAG_ERROR) + WRITE_ONCE(fs_info->fs_error, -EUCLEAN); + + /* If the fs has any rescue options, no transaction is allowed. */ + if (btrfs_is_full_ro(fs_info)) + WRITE_ONCE(fs_info->fs_error, -EROFS); + + /* Set up fs_info before parsing mount options */ + nodesize = btrfs_super_nodesize(disk_super); + sectorsize = btrfs_super_sectorsize(disk_super); + fs_info->dirty_metadata_batch = nodesize * (1 + ilog2(nr_cpu_ids)); + fs_info->delalloc_batch = sectorsize * 512 * (1 + ilog2(nr_cpu_ids)); + + fs_info->nodesize = nodesize; + fs_info->nodesize_bits = ilog2(nodesize); + fs_info->sectorsize = sectorsize; + fs_info->sectorsize_bits = ilog2(sectorsize); + fs_info->block_min_order = ilog2(round_up(sectorsize, PAGE_SIZE) >> PAGE_SHIFT); + /* + * For HIGHMEM, a large folio cannot be mapped in one go, breaking a lot + * of basic assumptions for btrfs IOs. + * Disable large folios for such 32-bit systems. + */ + if (IS_ENABLED(CONFIG_HIGHMEM)) + fs_info->block_max_order = fs_info->block_min_order; + else + fs_info->block_max_order = calc_block_max_order(fs_info->sectorsize_bits); + fs_info->csums_per_leaf = BTRFS_MAX_ITEM_SIZE(fs_info) / fs_info->csum_size; + fs_info->fs_devices->fs_info = fs_info; + + if (fs_info->sectorsize > PAGE_SIZE) + btrfs_warn(fs_info, + "support for block size %u with page size %lu is experimental, some features may be missing", + fs_info->sectorsize, PAGE_SIZE); + /* + * Handle the space caching options appropriately now that we have the + * super block loaded and validated. + */ + btrfs_set_free_space_cache_settings(fs_info); + + if (!btrfs_check_options(fs_info, &fs_info->mount_opt, sb->s_flags)) { + ret = -EINVAL; + goto fail_alloc; + } + + ret = btrfs_check_features(fs_info, !sb_rdonly(sb)); + if (ret < 0) + goto fail_alloc; + + if (btrfs_super_incompat_flags(disk_super) & BTRFS_FEATURE_INCOMPAT_REMAP_TREE) { + remap_root = btrfs_alloc_root(fs_info, BTRFS_REMAP_TREE_OBJECTID, + GFP_KERNEL); + fs_info->remap_root = remap_root; + if (!remap_root) { + ret = -ENOMEM; + goto fail_alloc; + } + } + + /* + * At this point our mount options are validated, if we set ->max_inline + * to something non-standard make sure we truncate it to sectorsize. + */ + fs_info->max_inline = min_t(u64, fs_info->max_inline, fs_info->sectorsize); + + ret = btrfs_alloc_compress_wsm(fs_info); + if (ret) + goto fail_sb_buffer; + ret = btrfs_init_workqueues(fs_info); + if (ret) + goto fail_sb_buffer; + + sb->s_bdi->ra_pages *= btrfs_super_num_devices(disk_super); + sb->s_bdi->ra_pages = max(sb->s_bdi->ra_pages, SZ_4M / PAGE_SIZE); + + /* Update the values for the current filesystem. */ + sb->s_blocksize = sectorsize; + sb->s_blocksize_bits = blksize_bits(sectorsize); + /* + * When temp_fsid is active, fs_devices->fsid is assigned a random UUID + * at mount. This inconsistent UUID causes issues for layered filesystems + * like OverlayFS. Since metadata_uuid may or may not be set, provide the + * on-disk UUID directly from the super_copy. + */ + if (fs_info->fs_devices->temp_fsid) + memcpy(&sb->s_uuid, fs_info->super_copy->fsid, BTRFS_FSID_SIZE); + else + 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: %pe", ERR_PTR(ret)); + goto fail_sb_buffer; + } + + generation = btrfs_super_chunk_root_generation(disk_super); + level = btrfs_super_chunk_root_level(disk_super); + ret = load_super_root(chunk_root, btrfs_super_chunk_root(disk_super), + generation, level); + if (ret) { + btrfs_err(fs_info, "failed to read chunk root"); + goto fail_tree_roots; + } + + read_extent_buffer(chunk_root->node, fs_info->chunk_tree_uuid, + offsetof(struct btrfs_header, chunk_tree_uuid), + BTRFS_UUID_SIZE); + + ret = btrfs_read_chunk_tree(fs_info); + if (ret) { + btrfs_err(fs_info, "failed to read chunk tree: %pe", ERR_PTR(ret)); + goto fail_tree_roots; + } + + /* + * At this point we know all the devices that make this filesystem, + * including the seed devices but we don't know yet if the replace + * target is required. So free devices that are not part of this + * filesystem but skip the replace target device which is checked + * below in btrfs_init_dev_replace(). + */ + btrfs_free_extra_devids(fs_devices); + if (unlikely(!fs_devices->latest_dev->bdev)) { + btrfs_err(fs_info, "failed to read devices"); + ret = -EIO; + goto fail_tree_roots; + } + + ret = init_tree_roots(fs_info); + if (ret) + goto fail_tree_roots; + + /* + * Get zone type information of zoned block devices. This will also + * handle emulation of a zoned filesystem if a regular device has the + * zoned incompat feature flag set. + */ + ret = btrfs_get_dev_zone_info_all_devices(fs_info); + if (ret) { + btrfs_err(fs_info, + "zoned: failed to read device zone info: %pe", ERR_PTR(ret)); + goto fail_block_groups; + } + + /* + * If we have a uuid root and we're not being told to rescan we need to + * check the generation here so we can set the + * BTRFS_FS_UPDATE_UUID_TREE_GEN bit. Otherwise we could commit the + * transaction during a balance or the log replay without updating the + * uuid generation, and then if we crash we would rescan the uuid tree, + * even though it was perfectly fine. + */ + if (fs_info->uuid_root && !btrfs_test_opt(fs_info, RESCAN_UUID_TREE) && + fs_info->generation == btrfs_super_uuid_tree_generation(disk_super)) + set_bit(BTRFS_FS_UPDATE_UUID_TREE_GEN, &fs_info->flags); + + if (unlikely(btrfs_verify_dev_items(fs_info))) { + ret = -EUCLEAN; + goto fail_block_groups; + } + ret = btrfs_verify_dev_extents(fs_info); + if (ret) { + btrfs_err(fs_info, + "failed to verify dev extents against chunks: %pe", + ERR_PTR(ret)); + goto fail_block_groups; + } + ret = btrfs_recover_balance(fs_info); + if (ret) { + btrfs_err(fs_info, "failed to recover balance: %pe", ERR_PTR(ret)); + goto fail_block_groups; + } + + ret = btrfs_init_dev_stats(fs_info); + if (ret) { + btrfs_err(fs_info, "failed to init dev_stats: %pe", ERR_PTR(ret)); + goto fail_block_groups; + } + + ret = btrfs_init_dev_replace(fs_info); + if (ret) { + btrfs_err(fs_info, "failed to init dev_replace: %pe", ERR_PTR(ret)); + goto fail_block_groups; + } + + ret = btrfs_check_zoned_mode(fs_info); + if (ret) { + btrfs_err(fs_info, "failed to initialize zoned mode: %pe", + ERR_PTR(ret)); + goto fail_block_groups; + } + + ret = btrfs_sysfs_add_fsid(fs_devices); + if (ret) { + btrfs_err(fs_info, "failed to init sysfs fsid interface: %pe", + ERR_PTR(ret)); + goto fail_block_groups; + } + + ret = btrfs_sysfs_add_mounted(fs_info); + if (ret) { + btrfs_err(fs_info, "failed to init sysfs interface: %pe", ERR_PTR(ret)); + goto fail_fsdev_sysfs; + } + + ret = btrfs_init_space_info(fs_info); + if (ret) { + btrfs_err(fs_info, "failed to initialize space info: %pe", ERR_PTR(ret)); + goto fail_sysfs; + } + + ret = btrfs_read_block_groups(fs_info); + if (ret) { + btrfs_err(fs_info, "failed to read block groups: %pe", ERR_PTR(ret)); + goto fail_sysfs; + } + + if (btrfs_fs_incompat(fs_info, REMAP_TREE)) { + ret = btrfs_populate_fully_remapped_bgs_list(fs_info); + if (ret) { + btrfs_err(fs_info, "failed to populate fully_remapped_bgs list: %pe", + ERR_PTR(ret)); + goto fail_sysfs; + } + } + + ret = btrfs_init_writeback_bio_size(fs_info); + if (ret) { + btrfs_err(fs_info, "failed to get optimum writeback size: %pe", + ERR_PTR(ret)); + goto fail_sysfs; + } + + btrfs_free_zone_cache(fs_info); + + btrfs_check_active_zone_reservation(fs_info); + + if (!sb_rdonly(sb) && fs_info->fs_devices->missing_devices && + !btrfs_check_rw_degradable(fs_info, NULL)) { + btrfs_warn(fs_info, + "writable mount is not allowed due to too many missing devices"); + ret = -EINVAL; + goto fail_sysfs; + } + + fs_info->cleaner_kthread = kthread_run(cleaner_kthread, fs_info, + "btrfs-cleaner"); + if (IS_ERR(fs_info->cleaner_kthread)) { + ret = PTR_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)) { + ret = PTR_ERR(fs_info->transaction_kthread); + goto fail_cleaner; + } + + /* + * Starts a transaction, must be called after the transaction kthread + * is initialized. + */ + btrfs_zoned_reserve_data_reloc_bg(fs_info); + + 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) + goto fail_qgroup; + } + + fs_info->fs_root = btrfs_get_fs_root(fs_info, BTRFS_FS_TREE_OBJECTID, true); + if (IS_ERR(fs_info->fs_root)) { + ret = PTR_ERR(fs_info->fs_root); + btrfs_err(fs_info, "failed to read fs tree: %pe", ERR_PTR(ret)); + fs_info->fs_root = NULL; + goto fail_qgroup; + } + + if (sb_rdonly(sb)) + return 0; + + ret = btrfs_start_pre_rw_mount(fs_info); + if (ret) { + close_ctree(fs_info); + return ret; + } + btrfs_discard_resume(fs_info); + + if (fs_info->uuid_root && + (btrfs_test_opt(fs_info, RESCAN_UUID_TREE) || + !test_bit(BTRFS_FS_UPDATE_UUID_TREE_GEN, &fs_info->flags))) { + btrfs_info(fs_info, "checking UUID tree"); + ret = btrfs_check_uuid_tree(fs_info); + if (ret) { + btrfs_err(fs_info, "failed to check the UUID tree: %pe", ERR_PTR(ret)); + close_ctree(fs_info); + return ret; + } + } + + set_bit(BTRFS_FS_OPEN, &fs_info->flags); + + /* Kick the cleaner thread so it'll start deleting snapshots. */ + if (test_bit(BTRFS_FS_UNFINISHED_DROPS, &fs_info->flags)) + wake_up_process(fs_info->cleaner_kthread); + + return 0; + +fail_qgroup: + btrfs_free_qgroup_config(fs_info); +fail_trans_kthread: + kthread_stop(fs_info->transaction_kthread); + btrfs_cleanup_transaction(fs_info); + btrfs_free_fs_roots(fs_info); +fail_cleaner: + kthread_stop(fs_info->cleaner_kthread); + + /* + * make sure we're done with the btree inode before we stop our + * kthreads + */ + filemap_write_and_wait(fs_info->btree_inode->i_mapping); + +fail_sysfs: + btrfs_sysfs_remove_mounted(fs_info); + +fail_fsdev_sysfs: + btrfs_sysfs_remove_fsid(fs_info->fs_devices); + +fail_block_groups: + btrfs_put_block_group_cache(fs_info); + +fail_tree_roots: + if (fs_info->data_reloc_root) + btrfs_drop_and_free_fs_root(fs_info, fs_info->data_reloc_root); + free_root_pointers(fs_info, true); + invalidate_and_check_btree_folios(fs_info); + +fail_sb_buffer: + btrfs_stop_all_workers(fs_info); + btrfs_free_block_groups(fs_info); +fail_alloc: + btrfs_mapping_tree_free(fs_info); + + iput(fs_info->btree_inode); +fail: + ASSERT(ret < 0); + return ret; +} +ALLOW_ERROR_INJECTION(open_ctree, ERRNO); + +static void btrfs_end_super_write(struct bio *bio) +{ + struct btrfs_device *device = bio->bi_private; + struct folio_iter fi; + + bio_for_each_folio_all(fi, bio) { + if (bio->bi_status) { + btrfs_warn_rl(device->fs_info, + "lost super block write due to IO error on %s (%d)", + btrfs_dev_name(device), + blk_status_to_errno(bio->bi_status)); + btrfs_dev_stat_inc_and_print(device, + BTRFS_DEV_STAT_WRITE_ERRS); + /* Ensure failure if the primary sb fails. */ + if (bio->bi_opf & REQ_FUA) + atomic_add(BTRFS_SUPER_PRIMARY_WRITE_ERROR, + &device->sb_write_errors); + else + atomic_inc(&device->sb_write_errors); + } + folio_unlock(fi.folio); + folio_put(fi.folio); + } + + bio_put(bio); +} + +/* + * Write superblock @sb to the @device. Do not wait for completion, all the + * folios we use for writing are locked. + * + * Write @max_mirrors copies of the superblock. Note that max_mirrors must be + * same for write and wait phases. + * + * Return number of errors when folio is not found or submission fails. + */ +static int write_dev_supers(struct btrfs_device *device, + struct btrfs_super_block *sb, int max_mirrors) +{ + struct btrfs_fs_info *fs_info = device->fs_info; + struct address_space *mapping = device->bdev->bd_mapping; + int i; + int ret; + u64 bytenr, bytenr_orig; + + atomic_set(&device->sb_write_errors, 0); + + for (i = 0; i < max_mirrors; i++) { + struct folio *folio; + struct bio *bio; + struct btrfs_super_block *disk_super; + size_t offset; + + bytenr_orig = btrfs_sb_offset(i); + ret = btrfs_sb_log_location(device, i, WRITE, &bytenr); + if (ret == -ENOENT) { + continue; + } else if (ret < 0) { + btrfs_err(device->fs_info, + "couldn't get super block location for mirror %d error %pe", + i, ERR_PTR(ret)); + atomic_inc(&device->sb_write_errors); + continue; + } + if (bytenr + BTRFS_SUPER_INFO_SIZE >= + device->commit_total_bytes) + break; + + btrfs_set_super_bytenr(sb, bytenr_orig); + + btrfs_csum(fs_info->csum_type, (const u8 *)sb + BTRFS_CSUM_SIZE, + BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE, sb->csum); + + folio = __filemap_get_folio(mapping, bytenr >> PAGE_SHIFT, + FGP_LOCK | FGP_ACCESSED | FGP_CREAT, + GFP_NOFS); + if (IS_ERR(folio)) { + btrfs_err(device->fs_info, + "couldn't get super block page for bytenr %llu error %pe", + bytenr, folio); + atomic_inc(&device->sb_write_errors); + continue; + } + + offset = offset_in_folio(folio, bytenr); + disk_super = folio_address(folio) + offset; + memcpy(disk_super, sb, BTRFS_SUPER_INFO_SIZE); + + /* + * Directly use bios here instead of relying on the page cache + * to do I/O, so we don't lose the ability to do integrity + * checking. + */ + bio = bio_alloc(device->bdev, 1, + REQ_OP_WRITE | REQ_SYNC | REQ_META | REQ_PRIO, + GFP_NOFS); + bio->bi_iter.bi_sector = bytenr >> SECTOR_SHIFT; + bio->bi_private = device; + bio->bi_end_io = btrfs_end_super_write; + bio_add_folio_nofail(bio, folio, BTRFS_SUPER_INFO_SIZE, offset); + + /* + * We FUA only the first super block. The others we allow to + * go down lazy and there's a short window where the on-disk + * copies might still contain the older version. + */ + if (i == 0 && !btrfs_test_opt(device->fs_info, NOBARRIER)) + bio->bi_opf |= REQ_FUA; + submit_bio(bio); + + if (btrfs_advance_sb_log(device, i)) + atomic_inc(&device->sb_write_errors); + } + return atomic_read(&device->sb_write_errors) < i ? 0 : -1; +} + +/* + * Wait for write completion of superblocks done by write_dev_supers, + * @max_mirrors same for write and wait phases. + * + * Return -1 if primary super block write failed or when there were no super block + * copies written. Otherwise 0. + */ +static int wait_dev_supers(struct btrfs_device *device, int max_mirrors) +{ + int i; + int errors = 0; + bool primary_failed = false; + int ret; + u64 bytenr; + + for (i = 0; i < max_mirrors; i++) { + struct folio *folio; + + ret = btrfs_sb_log_location(device, i, READ, &bytenr); + if (ret == -ENOENT) { + break; + } else if (unlikely(ret < 0)) { + errors++; + if (i == 0) + primary_failed = true; + continue; + } + if (bytenr + BTRFS_SUPER_INFO_SIZE >= + device->commit_total_bytes) + break; + + folio = filemap_get_folio(device->bdev->bd_mapping, + bytenr >> PAGE_SHIFT); + /* If the folio has been removed, then we know it completed. */ + if (IS_ERR(folio)) + continue; + + /* Folio will be unlocked once the write completes. */ + folio_wait_locked(folio); + folio_put(folio); + } + + errors += atomic_read(&device->sb_write_errors); + + if (unlikely(primary_failed || errors >= BTRFS_SUPER_PRIMARY_WRITE_ERROR)) { + 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) +{ + bio_uninit(bio); + complete(bio->bi_private); +} + +/* + * Submit a flush request to the device if it supports it. Error handling is + * done in the waiting counterpart. + */ +static void write_dev_flush(struct btrfs_device *device) +{ + struct bio *bio = &device->flush_bio; + + clear_bit(BTRFS_DEV_STATE_FLUSH_FAILED, &device->dev_state); + + bio_init(bio, device->bdev, NULL, 0, + REQ_OP_WRITE | REQ_SYNC | REQ_PREFLUSH); + bio->bi_end_io = btrfs_end_empty_barrier; + init_completion(&device->flush_wait); + bio->bi_private = &device->flush_wait; + 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. + * Return true for any error, and false otherwise. + */ +static bool wait_dev_flush(struct btrfs_device *device) +{ + struct bio *bio = &device->flush_bio; + + if (!test_and_clear_bit(BTRFS_DEV_STATE_FLUSH_SENT, &device->dev_state)) + return false; + + wait_for_completion_io(&device->flush_wait); + + if (unlikely(bio->bi_status)) { + set_bit(BTRFS_DEV_STATE_FLUSH_FAILED, &device->dev_state); + btrfs_dev_stat_inc_and_print(device, BTRFS_DEV_STAT_FLUSH_ERRS); + return true; + } + + return false; +} + +/* + * 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; + + 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); + } + + /* 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 (unlikely(!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; + + if (unlikely(wait_dev_flush(dev))) + errors_wait++; + } + + /* + * Checks flush failure of disks in order to determine the device + * state. + */ + if (unlikely(errors_wait && !btrfs_check_rw_degradable(info, NULL))) + return -EIO; + + 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) { + btrfs_warn(NULL, "unknown raid flag: %llu", flags); + min_tolerated = 0; + } + + return min_tolerated; +} + +int write_all_supers(struct btrfs_trans_handle *trans) +{ + struct btrfs_fs_info *fs_info = trans->fs_info; + struct list_head *head; + struct btrfs_device *dev; + struct btrfs_super_block *sb; + struct btrfs_dev_item *dev_item; + int max_mirrors; + int ret; + int do_barriers; + int max_errors; + int total_errors = 0; + + do_barriers = !btrfs_test_opt(fs_info, NOBARRIER); + + if (trans->transaction->state < TRANS_STATE_UNBLOCKED) { + /* We are called from fsync. */ + max_mirrors = 1; + } else { + /* We are called from transaction commit. */ + max_mirrors = BTRFS_SUPER_MIRROR_MAX; + ret = backup_super_roots(fs_info); + if (ret < 0) + return ret; + } + + 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 (unlikely(ret)) { + mutex_unlock( + &fs_info->fs_devices->device_list_mutex); + btrfs_abort_transaction(trans, ret); + btrfs_err(fs_info, "error while submitting device barriers"); + return ret; + } + } + + btrfs_set_super_flags(sb, btrfs_super_flags(sb) | BTRFS_HEADER_FLAG_WRITTEN); + + list_for_each_entry(dev, head, dev_list) { + if (unlikely(!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); + + ret = btrfs_validate_write_super(fs_info, sb); + if (unlikely(ret < 0)) { + mutex_unlock(&fs_info->fs_devices->device_list_mutex); + btrfs_abort_transaction(trans, ret); + btrfs_err(fs_info, + "unexpected superblock corruption before writing it"); + return ret; + } + + ret = write_dev_supers(dev, sb, max_mirrors); + if (unlikely(ret)) + total_errors++; + } + if (unlikely(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_abort_transaction(trans, -EIO); + btrfs_err(fs_info, "%d errors while writing supers", total_errors); + return -EIO; + } + + total_errors = 0; + list_for_each_entry(dev, head, dev_list) { + if (unlikely(!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 (unlikely(ret)) + total_errors++; + } + mutex_unlock(&fs_info->fs_devices->device_list_mutex); + if (unlikely(total_errors > max_errors)) { + btrfs_abort_transaction(trans, -EIO); + btrfs_err(fs_info, "%d errors while writing supers", total_errors); + return -EIO; + } + return 0; +} + +/* Drop a fs root from the radix tree and free it. */ +void btrfs_drop_and_free_fs_root(struct btrfs_fs_info *fs_info, + struct btrfs_root *root) +{ + bool drop_ref = false; + + spin_lock(&fs_info->fs_roots_radix_lock); + radix_tree_delete(&fs_info->fs_roots_radix, + (unsigned long)btrfs_root_id(root)); + if (test_and_clear_bit(BTRFS_ROOT_IN_RADIX, &root->state)) + drop_ref = true; + spin_unlock(&fs_info->fs_roots_radix_lock); + + if (unlikely(BTRFS_FS_ERROR(fs_info))) { + ASSERT(root->log_root == NULL); + if (root->reloc_root) { + btrfs_put_root(root->reloc_root); + root->reloc_root = NULL; + } + } + + if (drop_ref) + btrfs_put_root(root); +} + +int btrfs_commit_super(struct btrfs_fs_info *fs_info) +{ + 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); + + return btrfs_commit_current_transaction(fs_info->tree_root); +} + +static void warn_about_uncommitted_trans(struct btrfs_fs_info *fs_info) +{ + struct btrfs_transaction *trans; + struct btrfs_transaction *tmp; + bool found = false; + + /* + * This function is only called at the very end of close_ctree(), + * thus no other running transaction, no need to take trans_lock. + */ + ASSERT(test_bit(BTRFS_FS_CLOSING_DONE, &fs_info->flags)); + list_for_each_entry_safe(trans, tmp, &fs_info->trans_list, list) { + struct extent_state *cached = NULL; + u64 dirty_bytes = 0; + u64 cur = 0; + u64 found_start; + u64 found_end; + + found = true; + while (btrfs_find_first_extent_bit(&trans->dirty_pages, cur, + &found_start, &found_end, + EXTENT_DIRTY, &cached)) { + dirty_bytes += found_end + 1 - found_start; + cur = found_end + 1; + } + btrfs_warn(fs_info, + "transaction %llu (with %llu dirty metadata bytes) is not committed", + trans->transid, dirty_bytes); + btrfs_cleanup_one_transaction(trans); + + if (trans == fs_info->running_transaction) + fs_info->running_transaction = NULL; + list_del_init(&trans->list); + + btrfs_put_transaction(trans); + } + ASSERT(!found); +} + +void __cold close_ctree(struct btrfs_fs_info *fs_info) +{ + int ret; + + set_bit(BTRFS_FS_CLOSING_START, &fs_info->flags); + + /* + * If we had UNFINISHED_DROPS we could still be processing them, so + * clear that bit and wake up relocation so it can stop. + * We must do this before stopping the block group reclaim task, because + * at btrfs_relocate_block_group() we wait for this bit, and after the + * wait we stop with -EINTR if btrfs_fs_closing() returns non-zero - we + * have just set BTRFS_FS_CLOSING_START, so btrfs_fs_closing() will + * return 1. + */ + btrfs_wake_unfinished_drop(fs_info); + + /* + * We may have the reclaim task running and relocating a data block group, + * in which case it may create delayed iputs. So stop it before we park + * the cleaner kthread otherwise we can get new delayed iputs after + * parking the cleaner, and that can make the async reclaim task to hang + * if it's waiting for delayed iputs to complete, since the cleaner is + * parked and can not run delayed iputs - this will make us hang when + * trying to stop the async reclaim task. + */ + cancel_work_sync(&fs_info->reclaim_bgs_work); + /* + * 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); + + /* + * Before the unmount, we sync down all the writeback which can + * generate fixup work. We are about to run delalloc for autodefrag so + * piggy back on that by also flushing the fixup work which can also + * generate delalloc we would like to get run. + * + * After this, it is still possible that some thread doing writeback is + * in btrfs_queue_writepage_fixup() and might finish queueing some final + * work, racing the btrfs_fs_closing() check there. + */ + flush_workqueue(fs_info->fixup_workers); + + /* + * After we entered close_ctree() autodefrag could be running and before + * we parked the cleaner kthread, it dirtied folios of some inode. + * We don't want to leave any delalloc here, it may be flushed any time + * after this point and result in ordered extents that create delayed + * iputs after flushed the ordered extent queues further below, run + * delayed iputs and set BTRFS_FS_STATE_NO_DELAYED_IPUT. If we are + * mounted with flushoncommit, then btrfs_commit_super() called below + * will flush delalloc and wait for ordered extents but we end up + * getting delayed iputs than are never run. So flush delalloc and wait + * for ordered extents. + */ + btrfs_start_delalloc_roots(fs_info, LONG_MAX, false); + btrfs_wait_ordered_roots(fs_info, U64_MAX, NULL); + + /* + * Handle the error fs first, as it will flush and wait for all ordered + * extents. This will generate delayed iputs, thus we want to handle + * it first. + */ + if (unlikely(BTRFS_FS_ERROR(fs_info))) + btrfs_error_commit_super(fs_info); + + /* + * Similar case here, we have to wait for delalloc workers before we + * proceed below and stop the cleaner kthread, otherwise we trigger a + * use-after-tree on the cleaner kthread task_struct when a delalloc + * worker running submit_compressed_extents() adds a delayed iput, which + * does a wake up on the cleaner kthread, which was already freed below + * when we call kthread_stop(). + */ + btrfs_flush_workqueue(fs_info->delalloc_workers); + + /* + * We can have ordered extents getting their last reference dropped from + * the fs_info->workers queue because for async writes for data bios we + * queue a work for that queue, at btrfs_wq_submit_bio(), that runs + * run_one_async_done() which calls btrfs_bio_end_io() in case the bio + * has an error, and that later function can do the final + * btrfs_put_ordered_extent() on the ordered extent attached to the bio, + * which adds a delayed iput for the inode. So we must flush the queue + * so that we don't have delayed iputs after committing the current + * transaction below and stopping the cleaner and transaction kthreads. + */ + btrfs_flush_workqueue(fs_info->workers); + + /* + * When finishing a compressed write bio we schedule a work queue item + * to finish an ordered extent - end_bbio_compressed_write() + * calls btrfs_finish_ordered_extent() which in turns does a call to + * btrfs_queue_ordered_fn(), and that queues the ordered extent + * completion either in the endio_write_workers work queue or in the + * fs_info->endio_freespace_worker work queue. We flush those queues + * below, so before we flush them we must flush this queue for the + * workers of compressed writes. + */ + flush_workqueue(fs_info->endio_workers); + + /* + * After we parked the cleaner kthread, ordered extents may have + * completed and created new delayed iputs. If one of the async reclaim + * tasks is running and in the RUN_DELAYED_IPUTS flush state, then we + * can hang forever trying to stop it, because if a delayed iput is + * added after it ran btrfs_run_delayed_iputs() and before it called + * btrfs_wait_on_delayed_iputs(), it will hang forever since there is + * no one else to run iputs. + * + * So wait for all ongoing ordered extents to complete and then run + * delayed iputs. This works because once we reach this point no one + * can create new ordered extents, but delayed iputs can still be added + * by a reclaim worker (see comments further below). + * + * Also note that btrfs_wait_ordered_roots() is not safe here, because + * it waits for BTRFS_ORDERED_COMPLETE to be set on an ordered extent, + * but the delayed iput for the respective inode is made only when doing + * the final btrfs_put_ordered_extent() (which must happen at + * btrfs_finish_ordered_io() when we are unmounting). + */ + btrfs_flush_workqueue(fs_info->endio_write_workers); + /* Ordered extents for free space inodes. */ + btrfs_flush_workqueue(fs_info->endio_freespace_worker); + /* + * Run delayed iputs in case an async reclaim worker is waiting for them + * to be run as mentioned above. + */ + btrfs_run_delayed_iputs(fs_info); + + cancel_work_sync(&fs_info->async_reclaim_work); + cancel_work_sync(&fs_info->async_data_reclaim_work); + cancel_work_sync(&fs_info->preempt_reclaim_work); + cancel_work_sync(&fs_info->em_shrinker_work); + + /* + * Reclaim workers can run writeback which can queue fixup. + * After the above cancel_work_sync() calls, any such queueing attempts are + * guaranteed to see btrfs_fs_closing(), so at this point we can genuinely fully + * flush the fixup workqueue. This relies on the belief that *now* no thread can + * still be sitting in btrfs_queue_writepage_fixup(). + */ + flush_workqueue(fs_info->fixup_workers); + + /* + * Run delayed iputs again because an async reclaim worker may have + * added new ones if it was flushing delalloc: + * + * shrink_delalloc() -> btrfs_start_delalloc_roots() -> + * start_delalloc_inodes() -> btrfs_add_delayed_iput() + */ + btrfs_run_delayed_iputs(fs_info); + + /* There should be no more workload to generate new delayed iputs. */ + set_bit(BTRFS_FS_STATE_NO_DELAYED_IPUT, &fs_info->fs_state); + + /* Cancel or finish ongoing discard work */ + btrfs_discard_cleanup(fs_info); + + if (!sb_rdonly(fs_info->sb)) { + /* + * The cleaner kthread is stopped, so do one final pass over + * unused block groups. + */ + btrfs_delete_unused_bgs(fs_info); + + /* + * There might be existing delayed inode workers still running + * and holding an empty delayed inode item. We must wait for + * them to complete first because they can create a transaction. + * This happens when someone calls btrfs_balance_delayed_items() + * and then a transaction commit runs the same delayed nodes + * before any delayed worker has done something with the nodes. + * We must wait for any worker here and not at transaction + * commit time since that could cause a deadlock. + * This is a very rare case. + */ + btrfs_flush_workqueue(fs_info->delayed_workers); + + /* + * If the filesystem is shutdown, then an attempt to commit the + * super block (or any write) will just fail. Since we freeze + * the filesystem before shutting it down, the filesystem is in + * a consistent state and we don't need to commit super blocks. + */ + if (!btrfs_is_shutdown(fs_info)) { + ret = btrfs_commit_super(fs_info); + if (ret) + btrfs_err(fs_info, "commit super block returned %pe", ERR_PTR(ret)); + } + } + + kthread_stop(fs_info->transaction_kthread); + kthread_stop(fs_info->cleaner_kthread); + + ASSERT(list_empty(&fs_info->delayed_iputs)); + set_bit(BTRFS_FS_CLOSING_DONE, &fs_info->flags); + + if (unlikely(btrfs_check_quota_leak(fs_info))) { + DEBUG_WARN("qgroup reserved space leaked"); + btrfs_err(fs_info, "qgroup reserved space leaked"); + } + + btrfs_free_qgroup_config(fs_info); + ASSERT(list_empty(&fs_info->delalloc_roots)); + + if (percpu_counter_sum(&fs_info->delalloc_bytes)) { + btrfs_info(fs_info, "at unmount delalloc count %lld", + percpu_counter_sum(&fs_info->delalloc_bytes)); + } + + if (percpu_counter_sum(&fs_info->ordered_bytes)) + btrfs_info(fs_info, "at unmount dio bytes count %lld", + percpu_counter_sum(&fs_info->ordered_bytes)); + + btrfs_sysfs_remove_mounted(fs_info); + btrfs_sysfs_remove_fsid(fs_info->fs_devices); + + btrfs_put_block_group_cache(fs_info); + + /* We shouldn't have any transaction open at this point */ + warn_about_uncommitted_trans(fs_info); + + clear_bit(BTRFS_FS_OPEN, &fs_info->flags); + free_root_pointers(fs_info, true); + btrfs_free_fs_roots(fs_info); + + /* + * Drop metadata left stranded ahead of a zone write pointer while the + * endio workqueues are still up, so the final iput() of the btree inode + * below does not hang submitting a write that can no longer complete. + */ + btrfs_zoned_release_dirty_metadata(fs_info); + + /* + * We must make sure there is not any read request to + * submit after we stop all workers. + */ + invalidate_and_check_btree_folios(fs_info); + btrfs_stop_all_workers(fs_info); + + /* + * We must free the block groups after dropping the fs_roots as we could + * have had an IO error and have left over tree log blocks that aren't + * cleaned up until the fs roots are freed. This makes the block group + * accounting appear to be wrong because there's pending reserved bytes, + * so make sure we do the block group cleanup afterwards. + */ + btrfs_free_block_groups(fs_info); + + iput(fs_info->btree_inode); + + btrfs_mapping_tree_free(fs_info); +} + +void btrfs_mark_buffer_dirty(struct btrfs_trans_handle *trans, + struct extent_buffer *buf) +{ + struct btrfs_fs_info *fs_info = buf->fs_info; + u64 transid = btrfs_header_generation(buf); + +#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 + /* This is an active transaction (its state < TRANS_STATE_UNBLOCKED). */ + ASSERT(trans->transid == fs_info->generation); + btrfs_assert_tree_write_locked(buf); + if (unlikely(transid != fs_info->generation)) { + btrfs_abort_transaction(trans, -EUCLEAN); + btrfs_crit(fs_info, +"dirty buffer transid mismatch, logical %llu found transid %llu running transid %llu", + buf->start, transid, fs_info->generation); + } + set_extent_buffer_dirty(buf); +} + +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); +} + +static void btrfs_error_commit_super(struct btrfs_fs_info *fs_info) +{ + /* cleanup FS via transaction */ + btrfs_cleanup_transaction(fs_info); + + down_write(&fs_info->cleanup_work_sem); + up_write(&fs_info->cleanup_work_sem); +} + +static void btrfs_drop_all_logs(struct btrfs_fs_info *fs_info) +{ + struct btrfs_root *gang[8]; + u64 root_objectid = 0; + int ret; + + spin_lock(&fs_info->fs_roots_radix_lock); + while ((ret = radix_tree_gang_lookup(&fs_info->fs_roots_radix, + (void **)gang, root_objectid, + ARRAY_SIZE(gang))) != 0) { + int i; + + for (i = 0; i < ret; i++) + gang[i] = btrfs_grab_root(gang[i]); + spin_unlock(&fs_info->fs_roots_radix_lock); + + for (i = 0; i < ret; i++) { + if (!gang[i]) + continue; + root_objectid = btrfs_root_id(gang[i]); + btrfs_free_log(NULL, gang[i]); + btrfs_put_root(gang[i]); + } + root_objectid++; + spin_lock(&fs_info->fs_roots_radix_lock); + } + spin_unlock(&fs_info->fs_roots_radix_lock); + btrfs_free_log_root_tree(NULL, fs_info); +} + +static void btrfs_destroy_ordered_extents(struct btrfs_root *root) +{ + struct btrfs_ordered_extent *ordered; + + spin_lock(&root->ordered_extent_lock); + /* + * This will just short circuit the ordered completion stuff which will + * make sure the ordered extent gets properly cleaned up. + */ + list_for_each_entry(ordered, &root->ordered_extents, + root_extent_list) + set_bit(BTRFS_ORDERED_IOERR, &ordered->flags); + spin_unlock(&root->ordered_extent_lock); +} + +static void btrfs_destroy_all_ordered_extents(struct btrfs_fs_info *fs_info) +{ + struct btrfs_root *root; + 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, NULL); +} + +static void btrfs_destroy_delalloc_inodes(struct btrfs_root *root) +{ + struct btrfs_inode *btrfs_inode; + 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(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) { + unsigned int nofs_flag; + + nofs_flag = memalloc_nofs_save(); + invalidate_inode_pages2(inode->i_mapping); + memalloc_nofs_restore(nofs_flag); + 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; + LIST_HEAD(splice); + + spin_lock(&fs_info->delalloc_root_lock); + list_splice_init(&fs_info->delalloc_roots, &splice); + while (!list_empty(&splice)) { + root = list_first_entry(&splice, struct btrfs_root, + delalloc_root); + root = btrfs_grab_root(root); + BUG_ON(!root); + spin_unlock(&fs_info->delalloc_root_lock); + + btrfs_destroy_delalloc_inodes(root); + btrfs_put_root(root); + + spin_lock(&fs_info->delalloc_root_lock); + } + spin_unlock(&fs_info->delalloc_root_lock); +} + +static void btrfs_destroy_marked_extents(struct btrfs_fs_info *fs_info, + struct extent_io_tree *dirty_pages, + int mark) +{ + struct extent_buffer *eb; + u64 start = 0; + u64 end; + + while (btrfs_find_first_extent_bit(dirty_pages, start, &start, &end, + mark, NULL)) { + btrfs_clear_extent_bit(dirty_pages, start, end, mark, NULL); + while (start <= end) { + eb = find_extent_buffer(fs_info, start); + start += fs_info->nodesize; + if (!eb) + continue; + + btrfs_tree_lock(eb); + wait_on_extent_buffer_writeback(eb); + btrfs_clear_buffer_dirty(NULL, eb); + btrfs_tree_unlock(eb); + + free_extent_buffer_stale(eb); + } + } + btrfs_extent_io_tree_release(dirty_pages); +} + +static void btrfs_destroy_pinned_extent(struct btrfs_fs_info *fs_info, + struct extent_io_tree *unpin) +{ + u64 start; + u64 end; + + 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); + if (!btrfs_find_first_extent_bit(unpin, 0, &start, &end, + EXTENT_DIRTY, &cached_state)) { + mutex_unlock(&fs_info->unused_bg_unpin_mutex); + break; + } + + btrfs_clear_extent_dirty(unpin, start, end, &cached_state); + btrfs_free_extent_state(cached_state); + btrfs_error_unpin_extent_range(fs_info, start, end); + mutex_unlock(&fs_info->unused_bg_unpin_mutex); + cond_resched(); + } +} + +static void btrfs_cleanup_bg_io(struct btrfs_block_group *cache) +{ + struct inode *inode; + + inode = cache->io_ctl.inode; + if (inode) { + unsigned int nofs_flag; + + nofs_flag = memalloc_nofs_save(); + invalidate_inode_pages2(inode->i_mapping); + memalloc_nofs_restore(nofs_flag); + + BTRFS_I(inode)->generation = 0; + cache->io_ctl.inode = NULL; + iput(inode); + } + ASSERT(cache->io_ctl.pages == NULL); + btrfs_put_block_group(cache); +} + +void btrfs_cleanup_dirty_bgs(struct btrfs_transaction *cur_trans, + struct btrfs_fs_info *fs_info) +{ + struct btrfs_block_group *cache; + + spin_lock(&cur_trans->dirty_bgs_lock); + while (!list_empty(&cur_trans->dirty_bgs)) { + cache = list_first_entry(&cur_trans->dirty_bgs, + struct btrfs_block_group, + dirty_list); + + if (!list_empty(&cache->io_list)) { + spin_unlock(&cur_trans->dirty_bgs_lock); + list_del_init(&cache->io_list); + btrfs_cleanup_bg_io(cache); + spin_lock(&cur_trans->dirty_bgs_lock); + } + + list_del_init(&cache->dirty_list); + spin_lock(&cache->lock); + cache->disk_cache_state = BTRFS_DC_ERROR; + spin_unlock(&cache->lock); + + spin_unlock(&cur_trans->dirty_bgs_lock); + btrfs_put_block_group(cache); + btrfs_dec_delayed_refs_rsv_bg_updates(fs_info); + spin_lock(&cur_trans->dirty_bgs_lock); + } + spin_unlock(&cur_trans->dirty_bgs_lock); + + /* + * Refer to the definition of io_bgs member for details why it's safe + * to use it without any locking + */ + while (!list_empty(&cur_trans->io_bgs)) { + cache = list_first_entry(&cur_trans->io_bgs, + struct btrfs_block_group, + io_list); + + list_del_init(&cache->io_list); + spin_lock(&cache->lock); + cache->disk_cache_state = BTRFS_DC_ERROR; + spin_unlock(&cache->lock); + btrfs_cleanup_bg_io(cache); + } +} + +static void btrfs_free_all_qgroup_pertrans(struct btrfs_fs_info *fs_info) +{ + struct btrfs_root *gang[8]; + int i; + int ret; + + spin_lock(&fs_info->fs_roots_radix_lock); + while (1) { + ret = radix_tree_gang_lookup_tag(&fs_info->fs_roots_radix, + (void **)gang, 0, + ARRAY_SIZE(gang), + BTRFS_ROOT_TRANS_TAG); + if (ret == 0) + break; + for (i = 0; i < ret; i++) { + struct btrfs_root *root = gang[i]; + + btrfs_qgroup_free_meta_all_pertrans(root); + radix_tree_tag_clear(&fs_info->fs_roots_radix, + (unsigned long)btrfs_root_id(root), + BTRFS_ROOT_TRANS_TAG); + } + } + spin_unlock(&fs_info->fs_roots_radix_lock); +} + +void btrfs_cleanup_one_transaction(struct btrfs_transaction *cur_trans) +{ + struct btrfs_fs_info *fs_info = cur_trans->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); + + 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_marked_extents(fs_info, &cur_trans->dirty_pages, + EXTENT_DIRTY); + btrfs_destroy_pinned_extent(fs_info, &cur_trans->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_PREP) { + 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); + + 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); + spin_lock(&fs_info->trans_lock); + } + spin_unlock(&fs_info->trans_lock); + btrfs_destroy_all_ordered_extents(fs_info); + btrfs_destroy_delayed_inodes(fs_info); + btrfs_assert_delayed_root_empty(fs_info); + btrfs_destroy_all_delalloc_inodes(fs_info); + btrfs_drop_all_logs(fs_info); + btrfs_zoned_release_dirty_metadata(fs_info); + btrfs_free_all_qgroup_pertrans(fs_info); + mutex_unlock(&fs_info->transaction_kthread_mutex); + + return 0; +} + +int btrfs_init_root_free_objectid(struct btrfs_root *root) +{ + BTRFS_PATH_AUTO_FREE(path); + int ret; + struct extent_buffer *l; + struct btrfs_key search_key; + struct btrfs_key found_key; + int slot; + + path = btrfs_alloc_path(); + if (!path) + return -ENOMEM; + + search_key.objectid = BTRFS_LAST_FREE_OBJECTID; + search_key.type = -1; + search_key.offset = (u64)-1; + ret = btrfs_search_slot(NULL, root, &search_key, path, 0, 0); + if (ret < 0) + return ret; + if (unlikely(ret == 0)) { + /* + * Key with offset -1 found, there would have to exist a root + * with such id, but this is out of valid range. + */ + return -EUCLEAN; + } + if (path->slots[0] > 0) { + slot = path->slots[0] - 1; + l = path->nodes[0]; + btrfs_item_key_to_cpu(l, &found_key, slot); + root->free_objectid = max_t(u64, found_key.objectid + 1, + BTRFS_FIRST_FREE_OBJECTID); + } else { + root->free_objectid = BTRFS_FIRST_FREE_OBJECTID; + } + + return 0; +} + +int btrfs_get_free_objectid(struct btrfs_root *root, u64 *objectid) +{ + int ret; + mutex_lock(&root->objectid_mutex); + + if (unlikely(root->free_objectid >= BTRFS_LAST_FREE_OBJECTID)) { + btrfs_warn(root->fs_info, + "the objectid of root %llu reaches its highest value", + btrfs_root_id(root)); + ret = -ENOSPC; + goto out; + } + + *objectid = root->free_objectid++; + ret = 0; +out: + mutex_unlock(&root->objectid_mutex); + return ret; +} |