* Boston, MA 021110-1307, USA.
*/
-#include <linux/module.h>
#include "ctree.h"
#include "disk-io.h"
#include "transaction.h"
{
struct btrfs_path *path;
int ret;
- struct btrfs_leaf *l;
+ struct extent_buffer *l;
struct btrfs_key search_key;
+ struct btrfs_key found_key;
int slot;
path = btrfs_alloc_path();
BUG_ON(!path);
- search_key.objectid = (u64)-1;
+ search_key.objectid = BTRFS_LAST_FREE_OBJECTID;
+ search_key.type = -1;
search_key.offset = (u64)-1;
ret = btrfs_search_slot(NULL, root, &search_key, path, 0, 0);
if (ret < 0)
BUG_ON(ret == 0);
if (path->slots[0] > 0) {
slot = path->slots[0] - 1;
- l = btrfs_buffer_leaf(path->nodes[0]);
- *objectid = btrfs_disk_key_objectid(&l->items[slot].key);
+ l = path->nodes[0];
+ btrfs_item_key_to_cpu(l, &found_key, slot);
+ *objectid = max_t(u64, found_key.objectid,
+ BTRFS_FIRST_FREE_OBJECTID - 1);
} else {
- *objectid = BTRFS_FIRST_FREE_OBJECTID;
+ *objectid = BTRFS_FIRST_FREE_OBJECTID - 1;
}
ret = 0;
error:
return ret;
}
-/*
- * walks the btree of allocated inodes and find a hole.
- */
int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
u64 dirid, u64 *objectid)
{
- struct btrfs_path *path;
- struct btrfs_key key;
int ret;
- u64 hole_size = 0;
- int slot = 0;
- u64 last_ino = 0;
- int start_found;
- struct btrfs_leaf *l;
- struct btrfs_key search_key;
- u64 search_start = dirid;
-
- path = btrfs_alloc_path();
- BUG_ON(!path);
- search_key.flags = 0;
- search_start = root->last_inode_alloc;
- search_start = max(search_start, BTRFS_FIRST_FREE_OBJECTID);
- search_key.objectid = search_start;
- search_key.offset = 0;
-
- btrfs_init_path(path);
- start_found = 0;
- ret = btrfs_search_slot(trans, root, &search_key, path, 0, 0);
- if (ret < 0)
- goto error;
+ mutex_lock(&root->objectid_mutex);
- if (path->slots[0] > 0)
- path->slots[0]--;
+ if (unlikely(root->highest_objectid < BTRFS_FIRST_FREE_OBJECTID)) {
+ ret = btrfs_find_highest_inode(root, &root->highest_objectid);
+ if (ret)
+ goto out;
+ }
- while (1) {
- l = btrfs_buffer_leaf(path->nodes[0]);
- slot = path->slots[0];
- if (slot >= btrfs_header_nritems(&l->header)) {
- ret = btrfs_next_leaf(root, path);
- if (ret == 0)
- continue;
- if (ret < 0)
- goto error;
- if (!start_found) {
- *objectid = search_start;
- start_found = 1;
- goto found;
- }
- *objectid = last_ino > search_start ?
- last_ino : search_start;
- goto found;
- }
- btrfs_disk_key_to_cpu(&key, &l->items[slot].key);
- if (key.objectid >= search_start) {
- if (start_found) {
- if (last_ino < search_start)
- last_ino = search_start;
- hole_size = key.objectid - last_ino;
- if (hole_size > 0) {
- *objectid = last_ino;
- goto found;
- }
- }
- }
- start_found = 1;
- last_ino = key.objectid + 1;
- path->slots[0]++;
+ if (unlikely(root->highest_objectid >= BTRFS_LAST_FREE_OBJECTID)) {
+ ret = -ENOSPC;
+ goto out;
}
- // FIXME -ENOSPC
-found:
- root->last_inode_alloc = *objectid;
- btrfs_release_path(root, path);
- btrfs_free_path(path);
- BUG_ON(*objectid < search_start);
- return 0;
-error:
- btrfs_release_path(root, path);
- btrfs_free_path(path);
+
+ *objectid = ++root->highest_objectid;
+ ret = 0;
+out:
+ mutex_unlock(&root->objectid_mutex);
return ret;
}