io_uring: don't do opcode prep twice

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Calling into opcode prep handlers may be dangerous, as they re-read
SQE but might not re-initialise requests completely. If io_req_defer()
passed fast checks and is done with preparations, punt it async.

As all other cases are covered with nulling @sqe, this guarantees that
io_[opcode]_prep() are visited only once per request.

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

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Pavel Begunkov 2020-07-23 20:25:20 +03:00 • committed by Jens Axboe

parent 23b3628e45

commit ae34817bd9

1 changed files with 2 additions and 1 deletions

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fs/io_uring.c

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