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io_uring: inform block layer of how many requests we are submitting

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The block layer can use this knowledge to make smarter decisions on
how to handle the request, if it knows that N more may be coming. Switch
to using blk_start_plug_nr_ios() to pass in that information.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2021-10-06 11:01:42 -06:00
parent 88459b50b4
commit 5ca7a8b3f6
1 changed files with 3 additions and 1 deletions
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4
fs/io_uring.c
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@ -317,6 +317,7 @@ struct io_submit_state {
bool plug_started;
bool need_plug;
unsigned short submit_nr;
struct blk_plug plug;
};
@ -7060,7 +7061,7 @@ static int io_init_req(struct io_ring_ctx *ctx, struct io_kiocb *req,
if (state->need_plug && io_op_defs[opcode].plug) {
state->plug_started = true;
state->need_plug = false;
blk_start_plug(&state->plug);
blk_start_plug_nr_ios(&state->plug, state->submit_nr);
}
req->file = io_file_get(ctx, req, READ_ONCE(sqe->fd),
@ -7181,6 +7182,7 @@ static void io_submit_state_start(struct io_submit_state *state,
{
state->plug_started = false;
state->need_plug = max_ios > 2;
state->submit_nr = max_ios;
/* set only head, no need to init link_last in advance */
state->link.head = NULL;
}