Commit bd5437a7 authored by Bob Peterson's avatar Bob Peterson Committed by Steven Whitehouse
Browse files

GFS2: speed up delete/unlink performance for large files 



This patch improves the performance of delete/unlink
operations in a GFS2 file system where the files are large
by adding a layer of metadata read-ahead for indirect blocks.
Mileage will vary, but on my system, deleting an 8.6G file
dropped from 22 seconds to about 4.5 seconds.

Signed-off-by: default avatarBob Peterson <rpeterso@redhat.com>
Signed-off-by: default avatarSteven Whitehouse <swhiteho@redhat.com>
parent f75bbfb4

fs/gfs2/bmap.c

+23 −3
Original line number Diff line number Diff line
@@ -831,7 +831,7 @@ static int recursive_scan(struct gfs2_inode *ip, struct buffer_head *dibh, 
{

	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);

	struct buffer_head *bh = NULL;

	__be64 *top, *bottom;

	__be64 *top, *bottom, *t2;

	u64 bn;

	int error;

	int mh_size = sizeof(struct gfs2_meta_header);
@@ -859,7 +859,27 @@ static int recursive_scan(struct gfs2_inode *ip, struct buffer_head *dibh, 
	if (error)

		goto out;



	if (height < ip->i_height - 1)

	if (height < ip->i_height - 1) {

		struct buffer_head *rabh;



		for (t2 = top; t2 < bottom; t2++, first = 0) {

			if (!*t2)

				continue;



			bn = be64_to_cpu(*t2);

			rabh = gfs2_getbuf(ip->i_gl, bn, CREATE);

			if (trylock_buffer(rabh)) {

				if (buffer_uptodate(rabh)) {

					unlock_buffer(rabh);

					brelse(rabh);

					continue;

				}

				rabh->b_end_io = end_buffer_read_sync;

				submit_bh(READA | REQ_META, rabh);

				continue;

			}

			brelse(rabh);

		}

		for (; top < bottom; top++, first = 0) {

			if (!*top)

				continue;
@@ -871,7 +891,7 @@ static int recursive_scan(struct gfs2_inode *ip, struct buffer_head *dibh, 
			if (error)

				break;

		}



	}

out:

	brelse(bh);

	return error;

CRA Git | Maintained and supported by SUSTech CRA and CCSE