tree 07cee3c3d06eee9ff138f17023c7dadcb338f467
parent 222d396092acc11b4af03bede309aa066945e920
author Steven Whitehouse <swhiteho@redhat.com> 1168869137 +0000
committer Steven Whitehouse <swhiteho@redhat.com> 1170700621 -0500

[GFS2] Add writepages for "data=writeback" mounts

It occurred to me that although a gfs2 specific writepages for ordered
writes and journaled data would be tricky, by hooking writepages only
for "data=writeback" mounts we could take advantage of not needing
buffer heads (we don't use them on the read side, nor have we for some
time) and create much larger I/Os for the block layer.

Using blktrace both before and after, its possible to see that for large
I/Os, most of the requests generated through writepages are now 1024
sectors after this patch is applied as opposed to 8 sectors before.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>