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Subject[PATCH 20/24] GFS2: speed up delete/unlink performance for large files
Date
From: Bob Peterson <rpeterso@redhat.com>

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: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

diff --git a/fs/gfs2/bmap.c b/fs/gfs2/bmap.c
index 22ad413..834cd94 100644
--- a/fs/gfs2/bmap.c
+++ b/fs/gfs2/bmap.c
@@ -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;
--
1.7.4.4


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