* Boston, MA 021110-1307, USA.
*/
-#include <stdio.h>
-#include <stdlib.h>
-#include "kerncompat.h"
-#include "radix-tree.h"
#include "ctree.h"
+#include "transaction.h"
#include "disk-io.h"
#include "print-tree.h"
int btrfs_find_last_root(struct btrfs_root *root, u64 objectid,
struct btrfs_root_item *item, struct btrfs_key *key)
{
- struct btrfs_path path;
+ struct btrfs_path *path;
struct btrfs_key search_key;
- struct btrfs_leaf *l;
+ struct btrfs_key found_key;
+ struct extent_buffer *l;
int ret;
int slot;
search_key.objectid = objectid;
- search_key.type = (u8)-1;
+ search_key.type = BTRFS_ROOT_ITEM_KEY;
search_key.offset = (u64)-1;
- btrfs_init_path(&path);
- ret = btrfs_search_slot(NULL, root, &search_key, &path, 0, 0);
+ path = btrfs_alloc_path();
+ BUG_ON(!path);
+ ret = btrfs_search_slot(NULL, root, &search_key, path, 0, 0);
if (ret < 0)
goto out;
+
BUG_ON(ret == 0);
- l = &path.nodes[0]->leaf;
- BUG_ON(path.slots[0] == 0);
- slot = path.slots[0] - 1;
- if (btrfs_disk_key_objectid(&l->items[slot].key) != objectid) {
- ret = 1;
+ l = path->nodes[0];
+ BUG_ON(path->slots[0] == 0);
+ slot = path->slots[0] - 1;
+ btrfs_item_key_to_cpu(l, &found_key, slot);
+ if (found_key.objectid != objectid) {
+ ret = -ENOENT;
goto out;
}
- memcpy(item, btrfs_item_ptr(l, slot, struct btrfs_root_item),
- sizeof(*item));
- btrfs_disk_key_to_cpu(key, &l->items[slot].key);
- btrfs_release_path(root, &path);
+ read_extent_buffer(l, item, btrfs_item_ptr_offset(l, slot),
+ sizeof(*item));
+ memcpy(key, &found_key, sizeof(found_key));
ret = 0;
out:
+ btrfs_release_path(root, path);
+ btrfs_free_path(path);
return ret;
}
*root, struct btrfs_key *key, struct btrfs_root_item
*item)
{
- struct btrfs_path path;
- struct btrfs_leaf *l;
+ struct btrfs_path *path;
+ struct extent_buffer *l;
int ret;
int slot;
+ unsigned long ptr;
- btrfs_init_path(&path);
- ret = btrfs_search_slot(trans, root, key, &path, 0, 1);
+ path = btrfs_alloc_path();
+ BUG_ON(!path);
+ ret = btrfs_search_slot(trans, root, key, path, 0, 1);
if (ret < 0)
goto out;
BUG_ON(ret != 0);
- l = &path.nodes[0]->leaf;
- slot = path.slots[0];
- memcpy(btrfs_item_ptr(l, slot, struct btrfs_root_item), item,
- sizeof(*item));
+ l = path->nodes[0];
+ slot = path->slots[0];
+ ptr = btrfs_item_ptr_offset(l, slot);
+ write_extent_buffer(l, item, ptr, sizeof(*item));
+ btrfs_mark_buffer_dirty(path->nodes[0]);
out:
- btrfs_release_path(root, &path);
+ btrfs_release_path(root, path);
+ btrfs_free_path(path);
return ret;
}
{
int ret;
ret = btrfs_insert_item(trans, root, key, item, sizeof(*item));
- BUG_ON(ret);
return ret;
}
+#if 0
+int btrfs_find_dead_roots(struct btrfs_root *root, u64 objectid,
+ struct btrfs_root *latest)
+{
+ struct btrfs_root *dead_root;
+ struct btrfs_item *item;
+ struct btrfs_root_item *ri;
+ struct btrfs_key key;
+ struct btrfs_path *path;
+ int ret;
+ u32 nritems;
+ struct extent_buffer *leaf;
+ int slot;
+
+ key.objectid = objectid;
+ btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
+ key.offset = 0;
+ path = btrfs_alloc_path();
+ if (!path)
+ return -ENOMEM;
+ ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
+ if (ret < 0)
+ goto err;
+ while(1) {
+ leaf = path->nodes[0];
+ nritems = btrfs_header_nritems(leaf);
+ slot = path->slots[0];
+ if (slot >= nritems) {
+ ret = btrfs_next_leaf(root, path);
+ if (ret)
+ break;
+ leaf = path->nodes[0];
+ nritems = btrfs_header_nritems(leaf);
+ slot = path->slots[0];
+ }
+ item = btrfs_item_nr(leaf, slot);
+ btrfs_item_key_to_cpu(leaf, &key, slot);
+ if (btrfs_key_type(&key) != BTRFS_ROOT_ITEM_KEY)
+ goto next;
+
+ if (key.objectid < objectid)
+ goto next;
+
+ if (key.objectid > objectid)
+ break;
+
+ ri = btrfs_item_ptr(leaf, slot, struct btrfs_root_item);
+ if (btrfs_disk_root_refs(leaf, ri) != 0)
+ goto next;
+
+ dead_root = btrfs_read_fs_root_no_radix(root->fs_info, &key);
+ if (IS_ERR(dead_root)) {
+ ret = PTR_ERR(dead_root);
+ goto err;
+ }
+
+ ret = btrfs_add_dead_root(dead_root, latest,
+ &root->fs_info->dead_roots);
+ if (ret)
+ goto err;
+next:
+ slot++;
+ path->slots[0]++;
+ }
+ ret = 0;
+err:
+ btrfs_free_path(path);
+ return ret;
+}
+#endif
+
int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
struct btrfs_key *key)
{
- struct btrfs_path path;
+ struct btrfs_path *path;
int ret;
+ u32 refs;
+ struct btrfs_root_item *ri;
+ struct extent_buffer *leaf;
- btrfs_init_path(&path);
- ret = btrfs_search_slot(trans, root, key, &path, -1, 1);
+ path = btrfs_alloc_path();
+ BUG_ON(!path);
+ ret = btrfs_search_slot(trans, root, key, path, -1, 1);
if (ret < 0)
goto out;
BUG_ON(ret != 0);
- ret = btrfs_del_item(trans, root, &path);
+ leaf = path->nodes[0];
+ ri = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_root_item);
+
+ refs = btrfs_disk_root_refs(leaf, ri);
+ BUG_ON(refs != 0);
+ ret = btrfs_del_item(trans, root, path);
out:
- btrfs_release_path(root, &path);
+ btrfs_release_path(root, path);
+ btrfs_free_path(path);
+ return ret;
+}
+
+/*
+ * add a btrfs_root_ref item. type is either BTRFS_ROOT_REF_KEY
+ * or BTRFS_ROOT_BACKREF_KEY.
+ *
+ * The dirid, sequence, name and name_len refer to the directory entry
+ * that is referencing the root.
+ *
+ * For a forward ref, the root_id is the id of the tree referencing
+ * the root and ref_id is the id of the subvol or snapshot.
+ *
+ * For a back ref the root_id is the id of the subvol or snapshot and
+ * ref_id is the id of the tree referencing it.
+ */
+int btrfs_add_root_ref(struct btrfs_trans_handle *trans,
+ struct btrfs_root *tree_root,
+ u64 root_id, u8 type, u64 ref_id,
+ u64 dirid, u64 sequence,
+ const char *name, int name_len)
+{
+ struct btrfs_key key;
+ int ret;
+ struct btrfs_path *path;
+ struct btrfs_root_ref *ref;
+ struct extent_buffer *leaf;
+ unsigned long ptr;
+
+
+ path = btrfs_alloc_path();
+
+ key.objectid = root_id;
+ key.type = type;
+ key.offset = ref_id;
+
+ ret = btrfs_insert_empty_item(trans, tree_root, path, &key,
+ sizeof(*ref) + name_len);
+ BUG_ON(ret);
+
+ leaf = path->nodes[0];
+ ref = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_root_ref);
+ btrfs_set_root_ref_dirid(leaf, ref, dirid);
+ btrfs_set_root_ref_sequence(leaf, ref, sequence);
+ btrfs_set_root_ref_name_len(leaf, ref, name_len);
+ ptr = (unsigned long)(ref + 1);
+ write_extent_buffer(leaf, name, ptr, name_len);
+ btrfs_mark_buffer_dirty(leaf);
+
+ btrfs_free_path(path);
return ret;
}
projects / platform / upstream / btrfs-progs.git / blobdiff