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authorMing Lei <ming.lei@redhat.com>2017-12-18 15:40:43 +0800
committerJens Axboe <axboe@kernel.dk>2017-12-18 13:55:43 -0700
commit14cb0dc6479dc5ebc63b3a459a5d89a2f1b39fed (patch)
treedb336ec3ba6267370615b5bc60c104f03f924bef /block/blk-map.c
parenta9fa99146ab4fc029ba5551a1a3a0102fae7fddf (diff)
block: don't let passthrough IO go into .make_request_fn()
Commit a8821f3f3("block: Improvements to bounce-buffer handling") tries to make sure that the bio to .make_request_fn won't exceed BIO_MAX_PAGES, but ignores that passthrough I/O can use blk_queue_bounce() too. Especially, passthrough IO may not be sector-aligned, and the check of 'sectors < bio_sectors(*bio_orig)' inside __blk_queue_bounce() may become true even though the max bvec number doesn't exceed BIO_MAX_PAGES, then cause the bio splitted, and the original passthrough bio is submited to generic_make_request(). This patch fixes this issue by checking if the bio is passthrough IO, and use bio_kmalloc() to allocate the cloned passthrough bio. Cc: NeilBrown <neilb@suse.com> Fixes: a8821f3f3("block: Improvements to bounce-buffer handling") Tested-by: Michele Ballabio <barra_cuda@katamail.com> Signed-off-by: Ming Lei <ming.lei@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/blk-map.c')
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