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io_uring: refactor io_get_sequence()

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Clean up io_get_sequence() and add a comment describing the magic around
sequence correction.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/f55dc409936b8afa4698d24b8677a34d31077ccb.1623949695.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2021-06-17 18:14:05 +01:00 committed by Jens Axboe
parent c854357bc1
commit a3dbdf54da
1 changed files with 5 additions and 6 deletions
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11
fs/io_uring.c
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@ -5993,13 +5993,12 @@ static int io_req_prep_async(struct io_kiocb *req)
static u32 io_get_sequence(struct io_kiocb *req)
{
struct io_kiocb *pos;
struct io_ring_ctx *ctx = req->ctx;
u32 nr_reqs = 0;
u32 seq = req->ctx->cached_sq_head;
io_for_each_link(pos, req)
nr_reqs++;
return ctx->cached_sq_head - nr_reqs;
/* need original cached_sq_head, but it was increased for each req */
io_for_each_link(req, req)
seq--;
return seq;
}
static bool io_drain_req(struct io_kiocb *req)