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authorChris Mason <chris.mason@oracle.com>2008-06-26 00:01:31 +0400
committerChris Mason <chris.mason@oracle.com>2008-09-25 19:04:04 +0400
commit3f157a2fd2ad731e1ed9964fecdc5f459f04a4a4 (patch)
treedf9421e7b1d0c06d5efb8659f4317438d3d511d7 /fs/btrfs/tree-defrag.c
parent1b1e2135dc1e4efbcf25ac9ac9979316d4e1193e (diff)
downloadlinux-3f157a2fd2ad731e1ed9964fecdc5f459f04a4a4.tar.xz
Btrfs: Online btree defragmentation fixes
The btree defragger wasn't making forward progress because the new key wasn't being saved by the btrfs_search_forward function. This also disables the automatic btree defrag, it wasn't scaling well to huge filesystems. The auto-defrag needs to be done differently. Signed-off-by: Chris Mason <chris.mason@oracle.com>
Diffstat (limited to 'fs/btrfs/tree-defrag.c')
-rw-r--r--fs/btrfs/tree-defrag.c36
1 files changed, 19 insertions, 17 deletions
diff --git a/fs/btrfs/tree-defrag.c b/fs/btrfs/tree-defrag.c
index b17693f61fbc..cc2650b06952 100644
--- a/fs/btrfs/tree-defrag.c
+++ b/fs/btrfs/tree-defrag.c
@@ -32,10 +32,13 @@ int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
int wret;
int level;
int orig_level;
- int i;
int is_extent = 0;
int next_key_ret = 0;
u64 last_ret = 0;
+ u64 min_trans = 0;
+
+ if (cache_only)
+ goto out;
if (root->fs_info->extent_root == root) {
/*
@@ -43,10 +46,6 @@ int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
* we can't defrag the extent root without deadlock
*/
goto out;
-#if 0
- mutex_lock(&root->fs_info->alloc_mutex);
- is_extent = 1;
-#endif
}
if (root->ref_cows == 0 && !is_extent)
@@ -84,6 +83,17 @@ int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
path->lowest_level = 1;
path->keep_locks = 1;
+ if (cache_only)
+ min_trans = root->defrag_trans_start;
+
+ ret = btrfs_search_forward(root, &key, path, cache_only, min_trans);
+ if (ret < 0)
+ goto out;
+ if (ret > 0) {
+ ret = 0;
+ goto out;
+ }
+ btrfs_release_path(root, path);
wret = btrfs_search_slot(trans, root, &key, path, 0, 1);
if (wret < 0) {
@@ -95,7 +105,8 @@ int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
goto out;
}
path->slots[1] = btrfs_header_nritems(path->nodes[1]);
- next_key_ret = btrfs_find_next_key(root, path, &key, 1);
+ next_key_ret = btrfs_find_next_key(root, path, &key, 1, cache_only,
+ min_trans);
ret = btrfs_realloc_node(trans, root,
path->nodes[1], 0,
cache_only, &last_ret,
@@ -106,19 +117,9 @@ int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
ret = -EAGAIN;
}
- for (i = 1; i < BTRFS_MAX_LEVEL; i++) {
- if (path->locks[i]) {
- btrfs_tree_unlock(path->nodes[i]);
- path->locks[i] = 0;
- }
- if (path->nodes[i]) {
- free_extent_buffer(path->nodes[i]);
- path->nodes[i] = NULL;
- }
- }
+ btrfs_release_path(root, path);
if (is_extent)
btrfs_extent_post_op(trans, root);
-
out:
if (is_extent)
mutex_unlock(&root->fs_info->alloc_mutex);
@@ -138,6 +139,7 @@ done:
if (ret != -EAGAIN) {
memset(&root->defrag_progress, 0,
sizeof(root->defrag_progress));
+ root->defrag_trans_start = trans->transid;
}
return ret;
}