io_uring: add splice(2) support

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Add support for splice(2).

- output file is specified as sqe->fd, so it's handled by generic code
- hash_reg_file handled by generic code as well
- len is 32bit, but should be fine
- the fd_in is registered file, when SPLICE_F_FD_IN_FIXED is set, which
is a splice flag (i.e. sqe->splice_flags).

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

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Pavel Begunkov 2020-02-24 11:32:45 +03:00 • committed by Jens Axboe

parent 8da11c1994

commit 7d67af2c01

2 changed files with 122 additions and 1 deletions

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109

fs/io_uring.c

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14

include/uapi/linux/io_uring.h

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