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| author | Bob Peterson <rpeterso@redhat.com> | 2012-07-19 08:12:40 -0400 |
|---|---|---|
| committer | Steven Whitehouse <swhiteho@redhat.com> | 2012-07-19 14:51:08 +0100 |
| commit | 8e2e00473598dd5379d8408cb974dade000acafc (patch) | |
| tree | 1f7bfdf0d07b6c0315bbd11ffee174742d66a459 /fs/gfs2/bmap.c | |
| parent | 294f2ad5a545eb71d397623743ddd8201131bdad (diff) | |
| download | linux-stable-8e2e00473598dd5379d8408cb974dade000acafc.tar.gz linux-stable-8e2e00473598dd5379d8408cb974dade000acafc.tar.bz2 linux-stable-8e2e00473598dd5379d8408cb974dade000acafc.zip | |
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.c | 3 |
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); |