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authorTao Ma <tao.ma@oracle.com>2009-08-18 11:44:07 +0800
committerJoel Becker <joel.becker@oracle.com>2009-09-22 20:09:46 -0700
commitc18b812d127a971901180188b918a7cd98ccd4d6 (patch)
tree3f2d0a7b1fada7aaade612d14dcaa7229a4e06c9 /fs/ocfs2
parent7540c1a77b26bc2f9d86a0bfbe6597b05ec5f93d (diff)
ocfs2: Make transaction extend more efficient.
In ocfs2_extend_rotate_transaction, op_credits is the orignal credits in the handle and we only want to extend the credits for the rotation, but the old solution always double it. It is harmless for some minor operations, but for actions like reflink we may rotate tree many times and cause the credits increase dramatically. So this patch try to only increase the desired credits. Signed-off-by: Tao Ma <tao.ma@oracle.com>
Diffstat (limited to 'fs/ocfs2')
-rw-r--r--fs/ocfs2/alloc.c12
1 files changed, 10 insertions, 2 deletions
diff --git a/fs/ocfs2/alloc.c b/fs/ocfs2/alloc.c
index 7c879fc7834..38a42f5d59f 100644
--- a/fs/ocfs2/alloc.c
+++ b/fs/ocfs2/alloc.c
@@ -2326,10 +2326,18 @@ static int ocfs2_extend_rotate_transaction(handle_t *handle, int subtree_depth,
int op_credits,
struct ocfs2_path *path)
{
+ int ret;
int credits = (path->p_tree_depth - subtree_depth) * 2 + 1 + op_credits;
- if (handle->h_buffer_credits < credits)
- return ocfs2_extend_trans(handle, credits);
+ if (handle->h_buffer_credits < credits) {
+ ret = ocfs2_extend_trans(handle,
+ credits - handle->h_buffer_credits);
+ if (ret)
+ return ret;
+
+ if (unlikely(handle->h_buffer_credits < credits))
+ return ocfs2_extend_trans(handle, credits);
+ }
return 0;
}