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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: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
This commit is contained in:
Bob Peterson 2011-09-15 09:59:56 -04:00 committed by Steven Whitehouse
parent f75bbfb4dd
commit bd5437a7d4
1 changed files with 23 additions and 3 deletions
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26
fs/gfs2/bmap.c
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@ -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;