diff options
| -rw-r--r-- | fs/btrfs/ctree.h | 3 | ||||
| -rw-r--r-- | fs/btrfs/extent-tree.c | 37 | ||||
| -rw-r--r-- | fs/btrfs/volumes.c | 3 |
3 files changed, 38 insertions, 5 deletions
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h index 1573be6f9518..d88994f71eae 100644 --- a/fs/btrfs/ctree.h +++ b/fs/btrfs/ctree.h @@ -3480,7 +3480,8 @@ int btrfs_make_block_group(struct btrfs_trans_handle *trans, u64 type, u64 chunk_objectid, u64 chunk_offset, u64 size); struct btrfs_trans_handle *btrfs_start_trans_remove_block_group( - struct btrfs_fs_info *fs_info); + struct btrfs_fs_info *fs_info, + const u64 chunk_offset); int btrfs_remove_block_group(struct btrfs_trans_handle *trans, struct btrfs_root *root, u64 group_start, struct extent_map *em); diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index 78200932c1cf..e97d6d61cd42 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -10257,14 +10257,44 @@ out: } struct btrfs_trans_handle * -btrfs_start_trans_remove_block_group(struct btrfs_fs_info *fs_info) +btrfs_start_trans_remove_block_group(struct btrfs_fs_info *fs_info, + const u64 chunk_offset) { + struct extent_map_tree *em_tree = &fs_info->mapping_tree.map_tree; + struct extent_map *em; + struct map_lookup *map; + unsigned int num_items; + + read_lock(&em_tree->lock); + em = lookup_extent_mapping(em_tree, chunk_offset, 1); + read_unlock(&em_tree->lock); + ASSERT(em && em->start == chunk_offset); + /* + * We need to reserve 3 + N units from the metadata space info in order + * to remove a block group (done at btrfs_remove_chunk() and at + * btrfs_remove_block_group()), which are used for: + * * 1 unit for adding the free space inode's orphan (located in the tree * of tree roots). + * 1 unit for deleting the block group item (located in the extent + * tree). + * 1 unit for deleting the free space item (located in tree of tree + * roots). + * N units for deleting N device extent items corresponding to each + * stripe (located in the device tree). + * + * In order to remove a block group we also need to reserve units in the + * system space info in order to update the chunk tree (update one or + * more device items and remove one chunk item), but this is done at + * btrfs_remove_chunk() through a call to check_system_chunk(). */ + map = (struct map_lookup *)em->bdev; + num_items = 3 + map->num_stripes; + free_extent_map(em); + return btrfs_start_transaction_fallback_global_rsv(fs_info->extent_root, - 1, 1); + num_items, 1); } /* @@ -10333,7 +10363,8 @@ void btrfs_delete_unused_bgs(struct btrfs_fs_info *fs_info) * Want to do this before we do anything else so we can recover * properly if we fail to join the transaction. */ - trans = btrfs_start_trans_remove_block_group(fs_info); + trans = btrfs_start_trans_remove_block_group(fs_info, + block_group->key.objectid); if (IS_ERR(trans)) { btrfs_dec_block_group_ro(root, block_group); ret = PTR_ERR(trans); diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c index e0bd364e958d..45f20252efed 100644 --- a/fs/btrfs/volumes.c +++ b/fs/btrfs/volumes.c @@ -2853,7 +2853,8 @@ static int btrfs_relocate_chunk(struct btrfs_root *root, u64 chunk_offset) if (ret) return ret; - trans = btrfs_start_trans_remove_block_group(root->fs_info); + trans = btrfs_start_trans_remove_block_group(root->fs_info, + chunk_offset); if (IS_ERR(trans)) { ret = PTR_ERR(trans); btrfs_std_error(root->fs_info, ret, NULL); |