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authorChristoph Hellwig <hch@lst.de>2010-06-17 09:54:32 +0200
committerJens Axboe <jaxboe@fusionio.com>2010-06-17 10:10:53 +0200
commitfbbf055692aeb25c54c49d9ca84532de836fbba0 (patch)
treedf058ee803db2b5c8362fd2f2e8f60eacbd9138a /firmware/cis
parent79600aadcf35dd31ec284928cf45296fea98db61 (diff)
block: fix DISCARD_BARRIER requests
Filesystems assume that DISCARD_BARRIER are full barriers, so that they don't have to track in-progress discard operation when submitting new I/O. But currently we only treat them as elevator barriers, which don't actually do the nessecary queue drains. Also remove the unlikely around both the DISCARD and BARRIER requests - the happen far too often for a static mispredict. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
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