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-rw-r--r--fs/btrfs/dir-item.c102
1 files changed, 102 insertions, 0 deletions
diff --git a/fs/btrfs/dir-item.c b/fs/btrfs/dir-item.c
new file mode 100644
index 00000000000..2a888e97e1a
--- /dev/null
+++ b/fs/btrfs/dir-item.c
@@ -0,0 +1,102 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include "kerncompat.h"
+#include "radix-tree.h"
+#include "ctree.h"
+#include "disk-io.h"
+#include "hash.h"
+
+int btrfs_insert_dir_item(struct btrfs_root *root, char *name, int name_len,
+ u64 dir, u64 objectid, u8 type)
+{
+ int ret = 0;
+ struct btrfs_path path;
+ struct btrfs_dir_item *dir_item;
+ char *name_ptr;
+ struct btrfs_key key;
+ u32 data_size;
+
+ key.objectid = dir;
+ key.flags = 0;
+ ret = btrfs_name_hash(name, name_len, &key.offset);
+ BUG_ON(ret);
+ btrfs_init_path(&path);
+ data_size = sizeof(*dir_item) + name_len;
+ ret = btrfs_insert_empty_item(root, &path, &key, data_size);
+ if (ret)
+ goto out;
+
+ dir_item = btrfs_item_ptr(&path.nodes[0]->leaf, path.slots[0],
+ struct btrfs_dir_item);
+ btrfs_set_dir_objectid(dir_item, objectid);
+ btrfs_set_dir_type(dir_item, type);
+ btrfs_set_dir_flags(dir_item, 0);
+ name_ptr = (char *)(dir_item + 1);
+ memcpy(name_ptr, name, name_len);
+out:
+ btrfs_release_path(root, &path);
+ return ret;
+}
+
+int btrfs_del_dir_item(struct btrfs_root *root, u64 dir, char *name,
+ int name_len)
+{
+ int ret = 0;
+ struct btrfs_path path;
+ struct btrfs_key key;
+
+ key.objectid = dir;
+ key.flags = 0;
+ ret = btrfs_name_hash(name, name_len, &key.offset);
+ BUG_ON(ret);
+ btrfs_init_path(&path);
+ ret = btrfs_search_slot(root, &key, &path, 0, 1);
+ if (ret)
+ goto out;
+ ret = btrfs_del_item(root, &path);
+out:
+ btrfs_release_path(root, &path);
+ return ret;
+}
+
+int btrfs_lookup_dir_item(struct btrfs_root *root, u64 dir, char *name,
+ int name_len, u64 *objectid)
+{
+ int ret = 0;
+ struct btrfs_path path;
+ struct btrfs_dir_item *dir_item;
+ char *name_ptr;
+ struct btrfs_key key;
+ u32 item_len;
+ struct btrfs_item *item;
+
+ key.objectid = dir;
+ key.flags = 0;
+ ret = btrfs_name_hash(name, name_len, &key.offset);
+ BUG_ON(ret);
+ btrfs_init_path(&path);
+ ret = btrfs_search_slot(root, &key, &path, 0, 0);
+ if (ret)
+ goto out;
+
+ dir_item = btrfs_item_ptr(&path.nodes[0]->leaf, path.slots[0],
+ struct btrfs_dir_item);
+
+ item = path.nodes[0]->leaf.items + path.slots[0];
+ item_len = btrfs_item_size(item);
+ if (item_len != name_len + sizeof(struct btrfs_dir_item)) {
+ BUG();
+ ret = 1;
+ goto out;
+ }
+ name_ptr = (char *)(dir_item + 1);
+ if (memcmp(name_ptr, name, name_len)) {
+ BUG();
+ ret = 1;
+ goto out;
+ }
+ *objectid = btrfs_dir_objectid(dir_item);
+out:
+ btrfs_release_path(root, &path);
+ return ret;
+}