if (ret < 0)
goto out;
ret = btrfs_add_link(trans, root, ino, BTRFS_FIRST_FREE_OBJECTID, name,
- strlen(name), BTRFS_FT_REG_FILE, NULL, 1);
+ strlen(name), BTRFS_FT_REG_FILE, NULL, 1, 0);
if (ret < 0)
goto out;
return ret;
}
-static struct btrfs_root* link_subvol(struct btrfs_root *root,
- const char *base, u64 root_objectid)
-{
- struct btrfs_trans_handle *trans;
- struct btrfs_fs_info *fs_info = root->fs_info;
- struct btrfs_root *tree_root = fs_info->tree_root;
- struct btrfs_root *new_root = NULL;
- struct btrfs_path path;
- struct btrfs_inode_item *inode_item;
- struct extent_buffer *leaf;
- struct btrfs_key key;
- u64 dirid = btrfs_root_dirid(&root->root_item);
- u64 index = 2;
- char buf[BTRFS_NAME_LEN + 1]; /* for snprintf null */
- int len;
- int i;
- int ret;
-
- len = strlen(base);
- if (len == 0 || len > BTRFS_NAME_LEN)
- return NULL;
-
- btrfs_init_path(&path);
- key.objectid = dirid;
- key.type = BTRFS_DIR_INDEX_KEY;
- key.offset = (u64)-1;
-
- ret = btrfs_search_slot(NULL, root, &key, &path, 0, 0);
- if (ret <= 0) {
- error("search for DIR_INDEX dirid %llu failed: %d",
- (unsigned long long)dirid, ret);
- goto fail;
- }
-
- if (path.slots[0] > 0) {
- path.slots[0]--;
- btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]);
- if (key.objectid == dirid && key.type == BTRFS_DIR_INDEX_KEY)
- index = key.offset + 1;
- }
- btrfs_release_path(&path);
-
- trans = btrfs_start_transaction(root, 1);
- if (IS_ERR(trans)) {
- error("unable to start transaction");
- goto fail;
- }
-
- key.objectid = dirid;
- key.offset = 0;
- key.type = BTRFS_INODE_ITEM_KEY;
-
- ret = btrfs_lookup_inode(trans, root, &path, &key, 1);
- if (ret) {
- error("search for INODE_ITEM %llu failed: %d",
- (unsigned long long)dirid, ret);
- goto fail;
- }
- leaf = path.nodes[0];
- inode_item = btrfs_item_ptr(leaf, path.slots[0],
- struct btrfs_inode_item);
-
- key.objectid = root_objectid;
- key.offset = (u64)-1;
- key.type = BTRFS_ROOT_ITEM_KEY;
-
- memcpy(buf, base, len);
- for (i = 0; i < 1024; i++) {
- ret = btrfs_insert_dir_item(trans, root, buf, len,
- dirid, &key, BTRFS_FT_DIR, index);
- if (ret != -EEXIST)
- break;
- len = snprintf(buf, ARRAY_SIZE(buf), "%s%d", base, i);
- if (len < 1 || len > BTRFS_NAME_LEN) {
- ret = -EINVAL;
- break;
- }
- }
- if (ret)
- goto fail;
-
- btrfs_set_inode_size(leaf, inode_item, len * 2 +
- btrfs_inode_size(leaf, inode_item));
- btrfs_mark_buffer_dirty(leaf);
- btrfs_release_path(&path);
-
- /* add the backref first */
- ret = btrfs_add_root_ref(trans, tree_root, root_objectid,
- BTRFS_ROOT_BACKREF_KEY,
- root->root_key.objectid,
- dirid, index, buf, len);
- if (ret) {
- error("unable to add root backref for %llu: %d",
- root->root_key.objectid, ret);
- goto fail;
- }
-
- /* now add the forward ref */
- ret = btrfs_add_root_ref(trans, tree_root, root->root_key.objectid,
- BTRFS_ROOT_REF_KEY, root_objectid,
- dirid, index, buf, len);
- if (ret) {
- error("unable to add root ref for %llu: %d",
- root->root_key.objectid, ret);
- goto fail;
- }
-
- ret = btrfs_commit_transaction(trans, root);
- if (ret) {
- error("transaction commit failed: %d", ret);
- goto fail;
- }
-
- new_root = btrfs_read_fs_root(fs_info, &key);
- if (IS_ERR(new_root)) {
- error("unable to fs read root: %lu", PTR_ERR(new_root));
- new_root = NULL;
- }
-fail:
- btrfs_init_path(&path);
- return new_root;
-}
-
static int create_subvol(struct btrfs_trans_handle *trans,
struct btrfs_root *root, u64 root_objectid)
{
if (ret < 0)
break;
ret = btrfs_make_block_group(trans, fs_info, 0,
- BTRFS_BLOCK_GROUP_DATA,
- BTRFS_FIRST_CHUNK_TREE_OBJECTID,
- cur, len);
+ BTRFS_BLOCK_GROUP_DATA, cur, len);
if (ret < 0)
break;
cur += len;
goto fail;
fd = open(devname, O_RDWR);
if (fd < 0) {
- error("unable to open %s: %s", devname, strerror(errno));
+ error("unable to open %s: %m", devname);
goto fail;
}
btrfs_parse_features_to_string(features_buf, features);
task_deinit(ctx.info);
}
- image_root = link_subvol(root, subvol_name, CONV_IMAGE_SUBVOL_OBJECTID);
+ image_root = btrfs_mksubvol(root, subvol_name,
+ CONV_IMAGE_SUBVOL_OBJECTID, true);
if (!image_root) {
error("unable to link subvolume %s", subvol_name);
goto fail;
}
}
btrfs_release_path(&path);
+ if (ret)
+ return ret;
/*
* For HOLES mode (without NO_HOLES), we must ensure file extents
* cover the whole range of the image
}
fd = open(devname, O_RDWR);
if (fd < 0) {
- error("unable to open %s: %s", devname, strerror(errno));
+ error("unable to open %s: %m", devname);
ret = -EIO;
goto free_mem;
}
fsize = lseek(fd, 0, SEEK_END);
- root = open_ctree_fd(fd, devname, 0, OPEN_CTREE_WRITES);
+
+ /*
+ * For rollback, we don't really need to write anything so open it
+ * read-only. The write part will happen after we close the
+ * filesystem.
+ */
+ root = open_ctree_fd(fd, devname, 0, 0);
if (!root) {
error("unable to open ctree");
ret = -EIO;
projects / platform / upstream / btrfs-progs.git / blobdiff