1 #include <linux/module.h>
4 #include "transaction.h"
7 * walks the btree of allocated inodes and find a hole.
9 int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
10 struct btrfs_root *fs_root,
11 u64 dirid, u64 *objectid)
13 struct btrfs_path path;
21 struct btrfs_root *root = fs_root->fs_info->inode_root;
22 struct btrfs_key search_key;
23 u64 search_start = dirid;
25 if (fs_root->fs_info->last_inode_alloc_dirid == dirid)
26 search_start = fs_root->fs_info->last_inode_alloc;
28 search_start = max(search_start, BTRFS_FIRST_FREE_OBJECTID);
29 search_key.objectid = search_start;
31 btrfs_set_key_type(&search_key, BTRFS_INODE_MAP_ITEM_KEY);
32 search_key.offset = 0;
34 btrfs_init_path(&path);
36 ret = btrfs_search_slot(trans, root, &search_key, &path, 0, 0);
40 if (path.slots[0] > 0)
44 l = btrfs_buffer_leaf(path.nodes[0]);
46 if (slot >= btrfs_header_nritems(&l->header)) {
47 ret = btrfs_next_leaf(root, &path);
53 *objectid = search_start;
57 *objectid = last_ino > search_start ?
58 last_ino : search_start;
61 btrfs_disk_key_to_cpu(&key, &l->items[slot].key);
62 if (key.objectid >= search_start) {
64 if (last_ino < search_start)
65 last_ino = search_start;
66 hole_size = key.objectid - last_ino;
74 last_ino = key.objectid + 1;
79 root->fs_info->last_inode_alloc = *objectid;
80 root->fs_info->last_inode_alloc_dirid = dirid;
81 btrfs_release_path(root, &path);
82 BUG_ON(*objectid < search_start);
85 btrfs_release_path(root, &path);
89 int btrfs_insert_inode_map(struct btrfs_trans_handle *trans,
90 struct btrfs_root *fs_root,
91 u64 objectid, struct btrfs_key *location)
94 struct btrfs_path path;
95 struct btrfs_inode_map_item *inode_item;
97 struct btrfs_root *inode_root = fs_root->fs_info->inode_root;
99 key.objectid = objectid;
101 btrfs_set_key_type(&key, BTRFS_INODE_MAP_ITEM_KEY);
103 btrfs_init_path(&path);
104 ret = btrfs_insert_empty_item(trans, inode_root, &path, &key,
105 sizeof(struct btrfs_inode_map_item));
109 inode_item = btrfs_item_ptr(btrfs_buffer_leaf(path.nodes[0]),
110 path.slots[0], struct btrfs_inode_map_item);
111 btrfs_cpu_key_to_disk(&inode_item->key, location);
112 btrfs_mark_buffer_dirty(path.nodes[0]);
114 btrfs_release_path(inode_root, &path);
118 int btrfs_lookup_inode_map(struct btrfs_trans_handle *trans,
119 struct btrfs_root *fs_root, struct btrfs_path *path,
120 u64 objectid, int mod)
123 struct btrfs_key key;
124 int ins_len = mod < 0 ? -1 : 0;
126 struct btrfs_root *inode_root = fs_root->fs_info->inode_root;
128 key.objectid = objectid;
131 btrfs_set_key_type(&key, BTRFS_INODE_MAP_ITEM_KEY);
132 ret = btrfs_search_slot(trans, inode_root, &key, path, ins_len, cow);