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 path = btrfs_alloc_path();
36 btrfs_init_path(path);
38 ret = btrfs_search_slot(trans, root, &search_key, path, 0, 0);
42 if (path->slots[0] > 0)
46 l = btrfs_buffer_leaf(path->nodes[0]);
47 slot = path->slots[0];
48 if (slot >= btrfs_header_nritems(&l->header)) {
49 ret = btrfs_next_leaf(root, path);
55 *objectid = search_start;
59 *objectid = last_ino > search_start ?
60 last_ino : search_start;
63 btrfs_disk_key_to_cpu(&key, &l->items[slot].key);
64 if (key.objectid >= search_start) {
66 if (last_ino < search_start)
67 last_ino = search_start;
68 hole_size = key.objectid - last_ino;
76 last_ino = key.objectid + 1;
81 root->fs_info->last_inode_alloc = *objectid;
82 root->fs_info->last_inode_alloc_dirid = dirid;
83 btrfs_release_path(root, path);
84 btrfs_free_path(path);
85 BUG_ON(*objectid < search_start);
88 btrfs_release_path(root, path);
89 btrfs_free_path(path);
93 int btrfs_insert_inode_map(struct btrfs_trans_handle *trans,
94 struct btrfs_root *fs_root,
95 u64 objectid, struct btrfs_key *location)
98 struct btrfs_path *path;
99 struct btrfs_inode_map_item *inode_item;
100 struct btrfs_key key;
101 struct btrfs_root *inode_root = fs_root->fs_info->inode_root;
103 key.objectid = objectid;
105 btrfs_set_key_type(&key, BTRFS_INODE_MAP_ITEM_KEY);
107 path = btrfs_alloc_path();
109 btrfs_init_path(path);
110 ret = btrfs_insert_empty_item(trans, inode_root, path, &key,
111 sizeof(struct btrfs_inode_map_item));
115 inode_item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]),
116 path->slots[0], struct btrfs_inode_map_item);
117 btrfs_cpu_key_to_disk(&inode_item->key, location);
118 btrfs_mark_buffer_dirty(path->nodes[0]);
120 btrfs_release_path(inode_root, path);
121 btrfs_free_path(path);
125 int btrfs_lookup_inode_map(struct btrfs_trans_handle *trans,
126 struct btrfs_root *fs_root, struct btrfs_path *path,
127 u64 objectid, int mod)
130 struct btrfs_key key;
131 int ins_len = mod < 0 ? -1 : 0;
133 struct btrfs_root *inode_root = fs_root->fs_info->inode_root;
135 key.objectid = objectid;
138 btrfs_set_key_type(&key, BTRFS_INODE_MAP_ITEM_KEY);
139 ret = btrfs_search_slot(trans, inode_root, &key, path, ins_len, cow);