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authorTejun Heo <tj@kernel.org>2011-01-25 12:43:52 +0100
committerJens Axboe <jaxboe@fusionio.com>2011-01-25 12:43:52 +0100
commit143a87f4c9c629067afea5b6703d66ea88c82f8e (patch)
tree6abeae59e1d309d3c1a11eab97e22639c7fc5bd5 /include/linux/elevator.h
parent414b4ff5eecff0097d09c4a7da12e435fd503692 (diff)
block: improve flush bio completion
bio's for flush are completed twice - once during the data phase and one more time after the whole sequence is complete. The first completion shouldn't notify completion to the issuer. This was achieved by skipping all bio completion steps in req_bio_endio() for the first completion; however, this has two drawbacks. * Error is not recorded in bio and must be tracked somewhere else. * Partial completion is not supported. Both don't cause problems for the current users; however, they make further improvements difficult. Change req_bio_endio() such that it only skips the actual notification part for the first completion. bio completion is implemented with partial completions on mind anyway so this is as simple as moving the REQ_FLUSH_SEQ conditional such that only calling of bio_endio() is skipped. Signed-off-by: Tejun Heo <tj@kernel.org> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
Diffstat (limited to 'include/linux/elevator.h')
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