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authorSteven Whitehouse <swhiteho@redhat.com>2007-01-15 13:52:17 +0000
committerSteven Whitehouse <swhiteho@redhat.com>2007-02-05 13:37:01 -0500
commita8d638e30e768adc6956541f79f7bf05139ba475 (patch)
tree07cee3c3d06eee9ff138f17023c7dadcb338f467 /fs/gfs2/incore.h
parent222d396092acc11b4af03bede309aa066945e920 (diff)
downloadblackbird-op-linux-a8d638e30e768adc6956541f79f7bf05139ba475.tar.gz
blackbird-op-linux-a8d638e30e768adc6956541f79f7bf05139ba475.zip
[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>
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