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authorBob Peterson <rpeterso@redhat.com>2012-07-19 08:12:40 -0400
committerSteven Whitehouse <swhiteho@redhat.com>2012-07-19 14:51:08 +0100
commit8e2e00473598dd5379d8408cb974dade000acafc (patch)
tree1f7bfdf0d07b6c0315bbd11ffee174742d66a459 /fs/gfs2/bmap.c
parent294f2ad5a545eb71d397623743ddd8201131bdad (diff)
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GFS2: Reduce file fragmentation
This patch reduces GFS2 file fragmentation by pre-reserving blocks. The resulting improved on disk layout greatly speeds up operations in cases which would have resulted in interlaced allocation of blocks previously. A typical example of this is 10 parallel dd processes, each writing to a file in a common dirctory. The implementation uses an rbtree of reservations attached to each resource group (and each inode). Signed-off-by: Bob Peterson <rpeterso@redhat.com> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
Diffstat (limited to 'fs/gfs2/bmap.c')
-rw-r--r--fs/gfs2/bmap.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/fs/gfs2/bmap.c b/fs/gfs2/bmap.c
index 6d957a86482b..49cd7dd4a9fa 100644
--- a/fs/gfs2/bmap.c
+++ b/fs/gfs2/bmap.c
@@ -785,6 +785,9 @@ static int do_strip(struct gfs2_inode *ip, struct buffer_head *dibh,
if (error)
goto out_rlist;
+ if (gfs2_rs_active(ip->i_res)) /* needs to be done with the rgrp glock held */
+ gfs2_rs_deltree(ip->i_res);
+
error = gfs2_trans_begin(sdp, rg_blocks + RES_DINODE +
RES_INDIRECT + RES_STATFS + RES_QUOTA,
revokes);