Signed-off-by: Qu Wenruo wqu@suse.com --- fs/btrfs/subvolume.c | 78 +++++++++++++++++++++++++++++++++++++++++--- 1 file changed, 73 insertions(+), 5 deletions(-)
diff --git a/fs/btrfs/subvolume.c b/fs/btrfs/subvolume.c index 258c3dafef60..6fc28d53e552 100644 --- a/fs/btrfs/subvolume.c +++ b/fs/btrfs/subvolume.c @@ -155,6 +155,72 @@ out: return ret; }
+static int list_subvolums(struct btrfs_fs_info *fs_info) +{ + struct btrfs_root *tree_root = fs_info->tree_root; + struct btrfs_root *root; + struct btrfs_path path; + struct btrfs_key key; + char *result; + int ret = 0; + + result = malloc(PATH_MAX); + if (!result) + return -ENOMEM; + + ret = list_one_subvol(fs_info->fs_root, result); + if (ret < 0) + goto out; + root = fs_info->fs_root; + printf("ID %llu gen %llu path %.*s\n", + root->root_key.objectid, btrfs_root_generation(&root->root_item), + PATH_MAX, result); + + key.objectid = BTRFS_FIRST_FREE_OBJECTID; + key.type = BTRFS_ROOT_ITEM_KEY; + key.offset = 0; + btrfs_init_path(&path); + ret = btrfs_search_slot(NULL, tree_root, &key, &path, 0, 0); + if (ret < 0) + goto out; + while (1) { + if (path.slots[0] >= btrfs_header_nritems(path.nodes[0])) + goto next; + + btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]); + if (key.objectid > BTRFS_LAST_FREE_OBJECTID) + break; + if (key.objectid < BTRFS_FIRST_FREE_OBJECTID || + key.type != BTRFS_ROOT_ITEM_KEY) + goto next; + key.offset = (u64)-1; + root = btrfs_read_fs_root(fs_info, &key); + if (IS_ERR(root)) { + ret = PTR_ERR(root); + if (ret == -ENOENT) + goto next; + } + ret = list_one_subvol(root, result); + if (ret < 0) + goto out; + printf("ID %llu gen %llu path %.*s\n", + root->root_key.objectid, + btrfs_root_generation(&root->root_item), + PATH_MAX, result); +next: + ret = btrfs_next_item(tree_root, &path); + if (ret < 0) + goto out; + if (ret > 0) { + ret = 0; + break; + } + } +out: + free(result); + return ret; +} + static int get_subvol_name(u64 subvolid, char *name, int max_len) { struct btrfs_root_ref rref; @@ -268,10 +334,12 @@ static void list_subvols(u64 tree, char *nameptr, int max_name_len, int level)
void btrfs_list_subvols(void) { - char *nameptr = malloc(4096); - - list_subvols(BTRFS_FS_TREE_OBJECTID, nameptr, nameptr ? 4096 : 0, 40); + struct btrfs_fs_info *fs_info = current_fs_info; + int ret;
- if (nameptr) - free(nameptr); + if (!fs_info) + return; + ret = list_subvolums(fs_info); + if (ret < 0) + error("failed to list subvolume: %d", ret); }