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_key.objectid = search_start;
30 btrfs_set_key_type(&search_key, BTRFS_INODE_MAP_ITEM_KEY);
31 search_key.offset = 0;
33 btrfs_init_path(&path);
35 ret = btrfs_search_slot(trans, root, &search_key, &path, 0, 0);
39 if (path.slots[0] > 0)
43 l = &path.nodes[0]->leaf;
45 if (slot >= btrfs_header_nritems(&l->header)) {
46 ret = btrfs_next_leaf(root, &path);
52 *objectid = search_start;
56 *objectid = last_ino > search_start ?
57 last_ino : search_start;
60 btrfs_disk_key_to_cpu(&key, &l->items[slot].key);
61 if (key.objectid >= search_start) {
63 if (last_ino < search_start)
64 last_ino = search_start;
65 hole_size = key.objectid - last_ino;
73 last_ino = key.objectid + 1;
78 root->fs_info->last_inode_alloc = *objectid;
79 root->fs_info->last_inode_alloc_dirid = dirid;
80 btrfs_release_path(root, &path);
81 BUG_ON(*objectid < search_start);
84 btrfs_release_path(root, &path);
88 int btrfs_insert_inode_map(struct btrfs_trans_handle *trans,
89 struct btrfs_root *fs_root,
90 u64 objectid, struct btrfs_key *location)
93 struct btrfs_path path;
94 struct btrfs_inode_map_item *inode_item;
96 struct btrfs_root *inode_root = fs_root->fs_info->inode_root;
98 key.objectid = objectid;
100 btrfs_set_key_type(&key, BTRFS_INODE_MAP_ITEM_KEY);
102 btrfs_init_path(&path);
103 ret = btrfs_insert_empty_item(trans, inode_root, &path, &key,
104 sizeof(struct btrfs_inode_map_item));
108 inode_item = btrfs_item_ptr(&path.nodes[0]->leaf, path.slots[0],
109 struct btrfs_inode_map_item);
110 btrfs_cpu_key_to_disk(&inode_item->key, location);
112 btrfs_release_path(inode_root, &path);
116 int btrfs_lookup_inode_map(struct btrfs_trans_handle *trans,
117 struct btrfs_root *fs_root, struct btrfs_path *path,
118 u64 objectid, int mod)
121 struct btrfs_key key;
122 int ins_len = mod < 0 ? -1 : 0;
124 struct btrfs_root *inode_root = fs_root->fs_info->inode_root;
126 key.objectid = objectid;
129 btrfs_set_key_type(&key, BTRFS_INODE_MAP_ITEM_KEY);
130 ret = btrfs_search_slot(trans, inode_root, &key, path, ins_len, cow);