#include "transaction.h"
#include "disk-io.h"
#include "time.h"
+#include "messages.h"
/*
* Find a free inode index for later btrfs_add_link().
/* check the ref and backref exists */
inode_ref = btrfs_lookup_inode_ref(trans, root, path, name, namelen,
- ino, parent_ino, index, 0);
+ ino, parent_ino, 0);
if (IS_ERR(inode_ref)) {
ret = PTR_ERR(inode_ref);
goto out;
}
/*
+ * Change inode flags to given value
+ */
+int btrfs_change_inode_flags(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root, u64 ino, u64 flags)
+{
+ struct btrfs_inode_item *item;
+ struct btrfs_path *path;
+ struct btrfs_key key;
+ int ret;
+
+ path = btrfs_alloc_path();
+ if (!path)
+ return -ENOMEM;
+
+ key.objectid = ino;
+ key.type = BTRFS_INODE_ITEM_KEY;
+ key.offset = 0;
+
+ ret = btrfs_search_slot(trans, root, &key, path, 0, 1);
+ if (ret > 0) {
+ ret = -ENOENT;
+ goto out;
+ }
+ if (ret < 0)
+ goto out;
+
+ item = btrfs_item_ptr(path->nodes[0], path->slots[0],
+ struct btrfs_inode_item);
+ btrfs_set_inode_flags(path->nodes[0], item, flags);
+ btrfs_mark_buffer_dirty(path->nodes[0]);
+out:
+ btrfs_free_path(path);
+ return ret;
+}
+
+/*
* Make a dir under the parent inode 'parent_ino' with 'name'
* and 'mode', The owner will be root/root.
*/
*ino = ret_ino;
return ret;
}
+
+struct btrfs_root *btrfs_mksubvol(struct btrfs_root *root,
+ const char *base, u64 root_objectid,
+ bool convert)
+{
+ 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);
+ if (convert) {
+ 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;
+ }
+ }
+ } else {
+ ret = btrfs_insert_dir_item(trans, root, buf, len, dirid, &key,
+ BTRFS_FT_DIR, index);
+ }
+ 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;
+}
projects / platform / upstream / btrfs-progs.git / blobdiff