Commit c18b812d authored Aug 18, 2009 by Tao Ma Committed by Joel Becker Sep 22, 2009

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>

parent 7540c1a7

fs/ocfs2/alloc.c

+10 −2

Original line number	Diff line number	Diff line
		@@ -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)
		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;
		}

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