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io_uring: optimise io_rw_reissue()

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The hot path is IO completing on the first try. Reshuffle io_rw_reissue() so
it's checked first.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2021-01-19 13:32:34 +00:00 committed by Jens Axboe
parent 00835dce14
commit bf6182b6d4
1 changed files with 4 additions and 3 deletions
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7
fs/io_uring.c
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@ -2738,12 +2738,13 @@ static bool io_resubmit_prep(struct io_kiocb *req, int error)
static bool io_rw_reissue(struct io_kiocb *req, long res)
{
#ifdef CONFIG_BLOCK
umode_t mode = file_inode(req->file)->i_mode;
umode_t mode;
int ret;
if (!S_ISBLK(mode) && !S_ISREG(mode))
if (res != -EAGAIN && res != -EOPNOTSUPP)
return false;
if ((res != -EAGAIN && res != -EOPNOTSUPP) || io_wq_current_is_worker())
mode = file_inode(req->file)->i_mode;
if ((!S_ISBLK(mode) && !S_ISREG(mode)) || io_wq_current_is_worker())
return false;
lockdep_assert_held(&req->ctx->uring_lock);