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ublk: honor IO_URING_F_NONBLOCK for handling control command 

Most of control command handlers may sleep, so return -EAGAIN in case
of IO_URING_F_NONBLOCK to defer the handling into io wq context.

Fixes: 71f28f3136 ("ublk_drv: add io_uring based userspace block driver")
Reported-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Link: https://lore.kernel.org/r/20230104133235.836536-1-ming.lei@redhat.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Ming Lei 2023-01-04 21:32:35 +08:00 committed by Jens Axboe
parent 9cea62b2cb
commit fa8e442e83
1 changed files with 3 additions and 0 deletions
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3
drivers/block/ublk_drv.c
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@ -1992,6 +1992,9 @@ static int ublk_ctrl_uring_cmd(struct io_uring_cmd *cmd,
struct ublksrv_ctrl_cmd *header = (struct ublksrv_ctrl_cmd *)cmd->cmd;
int ret = -EINVAL;
if (issue_flags & IO_URING_F_NONBLOCK)
return -EAGAIN;
ublk_ctrl_cmd_dump(cmd);
if (!(issue_flags & IO_URING_F_SQE128))