ocfs2: Cache extent records

The extent map code was ripped out earlier because of an inability to deal
with holes. This patch adds back a simpler caching scheme requiring far less
code.

Our old extent map caching was designed back when meta data block caching in
Ocfs2 didn't work very well, resulting in many disk reads. These days our
metadata caching is much better, resulting in no un-necessary disk reads. As
a result, extent caching doesn't have to be as fancy, nor does it have to
cache as many extents. Keeping the last 3 extents seen should be sufficient
to give us a small performance boost on some streaming workloads.

Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/fs/ocfs2/inode.c b/fs/ocfs2/inode.c
index 4bfc98c70137..21a605079c62 100644
--- a/fs/ocfs2/inode.c
+++ b/fs/ocfs2/inode.c
@@ -1008,6 +1008,8 @@ void ocfs2_clear_inode(struct inode *inode)
                         "Clear inode of %llu, inode has io markers\n",
                         (unsigned long long)oi->ip_blkno);
 
+        ocfs2_extent_map_trunc(inode, 0);
+
         status = ocfs2_drop_inode_locks(inode);
         if (status < 0)
                 mlog_errno(status);