summaryrefslogtreecommitdiff
path: root/drivers/md
diff options
context:
space:
mode:
authorKiyoshi Ueda <k-ueda@ct.jp.nec.com>2009-01-06 03:05:07 +0000
committerAlasdair G Kergon <agk@redhat.com>2009-01-06 03:05:07 +0000
commit7d76345da6ed3927c9cbf5d3f7a7021e8bba7374 (patch)
treed0b470dd1a55dfffb27ffa012e4a5afebd133495 /drivers/md
parent8fbf26ad5b16ad3a826ca7fe3e86700420abed1f (diff)
dm request: extend target interface
This patch adds the following target interfaces for request-based dm. map_rq : for mapping a request rq_end_io : for finishing a request busy : for avoiding performance regression from bio-based dm. Target can tell dm core not to map requests now, and that may help requests in the block layer queue to be bigger by I/O merging. In bio-based dm, this behavior is done by device drivers managing the block layer queue. But in request-based dm, dm core has to do that since dm core manages the block layer queue. Signed-off-by: Kiyoshi Ueda <k-ueda@ct.jp.nec.com> Signed-off-by: Jun'ichi Nomura <j-nomura@ce.jp.nec.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Diffstat (limited to 'drivers/md')
0 files changed, 0 insertions, 0 deletions