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Btrfs: dirindex optimizations

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Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason
2007-04-05 13:35:25 -04:00
committed by David Woodhouse
parent 7fcde0e329
commit 5be6f7f174
5 changed files with 50 additions and 17 deletions
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48
fs/btrfs/inode-map.c
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@@ -3,6 +3,37 @@
#include "disk-io.h"
#include "transaction.h"
int btrfs_find_highest_inode(struct btrfs_root *fs_root, u64 *objectid)
{
struct btrfs_path *path;
int ret;
struct btrfs_leaf *l;
struct btrfs_root *root = fs_root->fs_info->inode_root;
struct btrfs_key search_key;
int slot;
path = btrfs_alloc_path();
BUG_ON(!path);
search_key.objectid = (u64)-1;
search_key.offset = (u64)-1;
ret = btrfs_search_slot(NULL, root, &search_key, path, 0, 0);
if (ret < 0)
goto error;
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);
} else {
*objectid = BTRFS_FIRST_FREE_OBJECTID;
}
ret = 0;
error:
btrfs_free_path(path);
return ret;
}
/*
* walks the btree of allocated inodes and find a hole.
*/
@@ -28,21 +59,6 @@ int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
btrfs_set_key_type(&search_key, BTRFS_INODE_MAP_ITEM_KEY);
search_start = fs_root->fs_info->last_inode_alloc;
if (search_start == 0) {
struct btrfs_disk_key *last_key;
btrfs_init_path(path);
search_key.objectid = (u64)-1;
search_key.offset = (u64)-1;
ret = btrfs_search_slot(trans, root, &search_key, path, 0, 0);
if (ret < 0)
goto error;
BUG_ON(ret == 0);
if (path->slots[0] > 0)
path->slots[0]--;
l = btrfs_buffer_leaf(path->nodes[0]);
last_key = &l->items[path->slots[0]].key;
search_start = btrfs_disk_key_objectid(last_key);
}
search_start = max(search_start, BTRFS_FIRST_FREE_OBJECTID);
search_key.objectid = search_start;
search_key.offset = 0;
@@ -129,6 +145,8 @@ int btrfs_insert_inode_map(struct btrfs_trans_handle *trans,
path->slots[0], struct btrfs_inode_map_item);
btrfs_cpu_key_to_disk(&inode_item->key, location);
btrfs_mark_buffer_dirty(path->nodes[0]);
if (objectid > fs_root->fs_info->highest_inode)
fs_root->fs_info->highest_inode = objectid;
out:
btrfs_release_path(inode_root, path);
btrfs_free_path(path);