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authorDavid Woodhouse <David.Woodhouse@intel.com>2008-08-09 16:42:20 +0100
committerJens Axboe <jens.axboe@oracle.com>2008-10-09 08:56:02 +0200
commite17fc0a1ccf88f6d4dcb363729f3141b0958c325 (patch)
tree0a7c2dc1c3159c2af14d87c67ca83e158b2c78b5 /virt
parentd30a2605be9d5132d95944916e8f578fcfe4f976 (diff)
downloadop-kernel-dev-e17fc0a1ccf88f6d4dcb363729f3141b0958c325.zip
op-kernel-dev-e17fc0a1ccf88f6d4dcb363729f3141b0958c325.tar.gz
Allow elevators to sort/merge discard requests
But blkdev_issue_discard() still emits requests which are interpreted as soft barriers, because naïve callers might otherwise issue subsequent writes to those same sectors, which might cross on the queue (if they're reallocated quickly enough). Callers still _can_ issue non-barrier discard requests, but they have to take care of queue ordering for themselves. Signed-off-by: David Woodhouse <David.Woodhouse@intel.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
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