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authorBob Peterson <rpeterso@redhat.com>2012-07-19 12:12:40 (GMT)
committerSteven Whitehouse <swhiteho@redhat.com>2012-07-19 13:51:08 (GMT)
commit8e2e00473598dd5379d8408cb974dade000acafc (patch)
tree1f7bfdf0d07b6c0315bbd11ffee174742d66a459 /fs/gfs2/super.c
parent294f2ad5a545eb71d397623743ddd8201131bdad (diff)
downloadlinux-8e2e00473598dd5379d8408cb974dade000acafc.tar.xz
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/super.c')
-rw-r--r--fs/gfs2/super.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/fs/gfs2/super.c b/fs/gfs2/super.c
index 7880687..b1502c4 100644
--- a/fs/gfs2/super.c
+++ b/fs/gfs2/super.c
@@ -1420,6 +1420,10 @@ static int gfs2_dinode_dealloc(struct gfs2_inode *ip)
return -EIO;
}
+ error = gfs2_rindex_update(sdp);
+ if (error)
+ return error;
+
error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
if (error)
return error;
@@ -1550,6 +1554,9 @@ out_truncate:
out_unlock:
/* Error path for case 1 */
+ if (gfs2_rs_active(ip->i_res))
+ gfs2_rs_deltree(ip->i_res);
+
if (test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags))
gfs2_glock_dq(&ip->i_iopen_gh);
gfs2_holder_uninit(&ip->i_iopen_gh);