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block: ublk_drv: mark device as LIVE before adding disk 

IO can be started before add_disk() returns, such as reading parititon table,
then the monitor work should work for making forward progress.

So mark device as LIVE before adding disk, meantime change to
DEAD if add_disk() fails.

Fixed: 71f28f3136 ("ublk_drv: add io_uring based userspace block driver")
Reviewed-by: Ziyang Zhang <ZiyangZhang@linux.alibaba.com>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Link: https://lore.kernel.org/r/20230318141231.55562-1-ming.lei@redhat.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Ming Lei 2023-03-18 22:12:31 +08:00 committed by Jens Axboe
parent 8f0d196e4d
commit 4985e7b2c0
1 changed files with 2 additions and 1 deletions
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3
drivers/block/ublk_drv.c
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@ -1602,17 +1602,18 @@ static int ublk_ctrl_start_dev(struct ublk_device *ub, struct io_uring_cmd *cmd)
set_bit(GD_SUPPRESS_PART_SCAN, &disk->state);
get_device(&ub->cdev_dev);
ub->dev_info.state = UBLK_S_DEV_LIVE;
ret = add_disk(disk);
if (ret) {
/*
* Has to drop the reference since ->free_disk won't be
* called in case of add_disk failure.
*/
ub->dev_info.state = UBLK_S_DEV_DEAD;
ublk_put_device(ub);
goto out_put_disk;
}
set_bit(UB_STATE_USED, &ub->state);
ub->dev_info.state = UBLK_S_DEV_LIVE;
out_put_disk:
if (ret)
put_disk(disk);