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Btrfs: Defrag only leaves, and only when the parent node has a single objectid

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This allows us to defrag huge directories, but skip the expensive defrag
case in more common usage, where it does not help as much.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason
2007-10-15 16:22:39 -04:00
parent ff79f8190b
commit a6b6e75e09
4 changed files with 23 additions and 40 deletions
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36
fs/btrfs/tree-defrag.c
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@@ -76,7 +76,9 @@ static int defrag_walk_down(struct btrfs_trans_handle *trans,
if (*level == 1) {
ret = btrfs_realloc_node(trans, root,
path->nodes[*level],
cache_only, last_ret);
path->slots[*level],
cache_only, last_ret,
&root->defrag_progress);
if (is_extent)
btrfs_extent_post_op(trans, root);
@@ -100,10 +102,6 @@ static int defrag_walk_down(struct btrfs_trans_handle *trans,
ret = btrfs_cow_block(trans, root, next, path->nodes[*level],
path->slots[*level], &next);
BUG_ON(ret);
ret = btrfs_realloc_node(trans, root, next, cache_only,
last_ret);
BUG_ON(ret);
if (is_extent)
btrfs_extent_post_op(trans, root);
@@ -122,8 +120,8 @@ static int defrag_walk_down(struct btrfs_trans_handle *trans,
free_extent_buffer(path->nodes[*level]);
path->nodes[*level] = NULL;
*level += 1;
WARN_ON(ret);
return 0;
WARN_ON(ret && ret != -EAGAIN);
return ret;
}
static int defrag_walk_up(struct btrfs_trans_handle *trans,
@@ -147,27 +145,6 @@ static int defrag_walk_up(struct btrfs_trans_handle *trans,
root->defrag_level = i;
return 0;
} else {
if (*level > 1 && path->nodes[*level] != root->node &&
btrfs_buffer_defrag(path->nodes[*level])) {
struct extent_buffer *next;
u64 last;
int ret;
ret = btrfs_cow_block(trans, root,
path->nodes[*level],
path->nodes[*level + 1],
path->slots[*level + 1],
&next);
BUG_ON(ret);
path->nodes[*level] = next;
last = next->start;
ret = btrfs_realloc_node(trans, root, next,
cache_only, &last);
BUG_ON(ret);
if (root == root->fs_info->extent_root)
btrfs_extent_post_op(trans, root);
}
btrfs_clear_buffer_defrag(path->nodes[*level]);
free_extent_buffer(path->nodes[*level]);
path->nodes[*level] = NULL;
@@ -211,9 +188,6 @@ int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
extent_buffer_get(root->node);
ret = btrfs_cow_block(trans, root, root->node, NULL, 0, &tmp);
BUG_ON(ret);
ret = btrfs_realloc_node(trans, root, root->node, cache_only,
&last_ret);
BUG_ON(ret);
path->nodes[level] = root->node;
path->slots[level] = 0;
if (is_extent)