This function will be used to free a empty chunk. This provides the basis for later temp chunk cleanup.
Signed-off-by: Qu Wenruo <[email protected]> --- ctree.h | 2 ++ extent-tree.c | 80 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 82 insertions(+) diff --git a/ctree.h b/ctree.h index f14a795..5550d45 100644 --- a/ctree.h +++ b/ctree.h @@ -2275,6 +2275,8 @@ int btrfs_record_file_extent(struct btrfs_trans_handle *trans, struct btrfs_inode_item *inode, u64 file_pos, u64 disk_bytenr, u64 num_bytes); +int btrfs_free_block_group(struct btrfs_trans_handle *trans, + struct btrfs_fs_info *fs_info, u64 bytenr, u64 len); /* ctree.c */ int btrfs_comp_cpu_keys(struct btrfs_key *k1, struct btrfs_key *k2); int btrfs_del_ptr(struct btrfs_trans_handle *trans, struct btrfs_root *root, diff --git a/extent-tree.c b/extent-tree.c index 39d6288..358bd19 100644 --- a/extent-tree.c +++ b/extent-tree.c @@ -3743,6 +3743,86 @@ out: return ret; } +int btrfs_free_block_group(struct btrfs_trans_handle *trans, + struct btrfs_fs_info *fs_info, u64 bytenr, u64 len) +{ + struct btrfs_root *extent_root = fs_info->extent_root; + struct btrfs_path *path; + struct btrfs_block_group_item *bgi; + struct btrfs_key key; + int ret = 0; + + path = btrfs_alloc_path(); + if (!path) + return -ENOMEM; + + key.objectid = bytenr; + key.type = BTRFS_BLOCK_GROUP_ITEM_KEY; + key.offset = len; + + /* Double check the block group to ensure it's empty */ + ret = btrfs_search_slot(trans, extent_root, &key, path, 0, 0); + if (ret > 0) { + ret = -ENONET; + goto out; + } + if (ret < 0) + goto out; + + bgi = btrfs_item_ptr(path->nodes[0], path->slots[0], + struct btrfs_block_group_item); + if (btrfs_disk_block_group_used(path->nodes[0], bgi)) { + fprintf(stderr, + "warning: block group [%llu,%llu) is not empty to free\n", + bytenr, bytenr + len); + ret = -EINVAL; + goto out; + } + btrfs_release_path(path); + + /* + * Now pin all space in the block group, to prevent further transaction + * allocate space from it. + * Every operation needs a transaction must be in the range. + */ + btrfs_pin_extent(fs_info, bytenr, len); + + /* delete block group item and chunk item */ + ret = free_block_group_item(trans, fs_info, bytenr, len); + if (ret < 0) { + fprintf(stderr, + "failed to free block group item for [%llu,%llu)\n", + bytenr, bytenr + len); + btrfs_unpin_extent(fs_info, bytenr, len); + goto out; + } + + ret = free_chunk_dev_extent_items(trans, fs_info, bytenr); + if (ret < 0) { + fprintf(stderr, + "failed to dev extents belongs to [%llu,%llu)\n", + bytenr, bytenr + len); + btrfs_unpin_extent(fs_info, bytenr, len); + goto out; + } + ret = free_chunk_item(trans, fs_info, bytenr, len); + if (ret < 0) { + fprintf(stderr, + "failed to free chunk for [%llu,%llu)\n", + bytenr, bytenr + len); + btrfs_unpin_extent(fs_info, bytenr, len); + goto out; + } + + /* Now release the block_group_cache */ + ret = free_block_group_cache(trans, fs_info, bytenr, len); + btrfs_unpin_extent(fs_info, bytenr, len); + +out: + btrfs_free_path(path); + return ret; +} + /* * Fixup block accounting. The initial block accounting created by * make_block_groups isn't accuracy in this case. -- 2.4.4 -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
