Introduce two functions, free_dev_extent_item and free_chunk_dev_extent_items, to free dev extent items in a chunk.
Signed-off-by: Qu Wenruo <[email protected]> --- extent-tree.c | 74 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 74 insertions(+) diff --git a/extent-tree.c b/extent-tree.c index d002a4f..afc7822 100644 --- a/extent-tree.c +++ b/extent-tree.c @@ -3483,6 +3483,80 @@ out: return ret; } +static int free_dev_extent_item(struct btrfs_trans_handle *trans, + struct btrfs_fs_info *fs_info, + u64 devid, u64 dev_offset) +{ + struct btrfs_root *root = fs_info->dev_root; + struct btrfs_path *path; + struct btrfs_key key; + int ret; + + path = btrfs_alloc_path(); + if (!path) + return -ENOMEM; + + + key.objectid = devid; + key.type = BTRFS_DEV_EXTENT_KEY; + key.offset = dev_offset; + + ret = btrfs_search_slot(trans, root, &key, path, -1, 1); + if (ret < 0) + goto out; + if (ret > 0) { + ret = -ENOENT; + goto out; + } + + ret = btrfs_del_item(trans, root, path); +out: + btrfs_free_path(path); + return ret; +} + +static int free_chunk_dev_extent_items(struct btrfs_trans_handle *trans, + struct btrfs_fs_info *fs_info, + u64 chunk_offset) +{ + struct btrfs_chunk *chunk = NULL; + struct btrfs_root *root= fs_info->chunk_root; + struct btrfs_path *path; + struct btrfs_key key; + u16 num_stripes; + int i; + int ret; + + path = btrfs_alloc_path(); + if (!path) + return -ENOMEM; + + key.objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID; + key.type = BTRFS_CHUNK_ITEM_KEY; + key.offset = chunk_offset; + + ret = btrfs_search_slot(trans, root, &key, path, 0, 0); + if (ret < 0) + goto out; + if (ret > 0) { + ret = -ENOENT; + goto out; + } + chunk = btrfs_item_ptr(path->nodes[0], path->slots[0], + struct btrfs_chunk); + num_stripes = btrfs_chunk_num_stripes(path->nodes[0], chunk); + for (i = 0; i < num_stripes; i++) { + ret = free_dev_extent_item(trans, fs_info, + btrfs_stripe_devid_nr(path->nodes[0], chunk, i), + btrfs_stripe_offset_nr(path->nodes[0], chunk, i)); + if (ret < 0) + goto out; + } +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
