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authorJens Axboe <axboe@kernel.dk>2019-02-27 13:05:25 -0700
committerJens Axboe <axboe@kernel.dk>2019-03-18 10:44:48 -0600
commit875f1d0769cdcfe1596ff0ca609b453359e42ec9 (patch)
tree7a62a8236e2412bc136376e0c22114b5e631f98a /block
parentbf33a7699e992b12d4c7d39dc3f0b61f6b26c5c2 (diff)
iov_iter: add ITER_BVEC_FLAG_NO_REF flag
For ITER_BVEC, if we're holding on to kernel pages, the caller doesn't need to grab a reference to the bvec pages, and drop that same reference on IO completion. This is essentially safe for any ITER_BVEC, but some use cases end up reusing pages and uncondtionally dropping a page reference on completion. And example of that is sendfile(2), that ends up being a splice_in + splice_out on the pipe pages. Add a flag that tells us it's fine to not grab a page reference to the bvec pages, since that caller knows not to drop a reference when it's done with the pages. Signed-off-by: Jens Axboe <axboe@kernel.dk>
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