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ublk: improve getting & putting ublk device

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Firstly convert get_device() and put_device() into ublk_get_device()
and ublk_put_device().

Secondly annotate ublk_get_device() & ublk_put_device() as noinline
for trace, especially it is often to trigger device deletion hang
when incorrect order is used on ublkc mmap, ublkc close,
io_uring_sqe_unregister_file, ublkb close.

Signed-off-by: Ming Lei <ming.lei@redhat.com>
Link: https://lore.kernel.org/r/20240223075539.89945-2-ming.lei@redhat.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Ming Lei 2024-02-23 15:55:38 +08:00 committed by Jens Axboe
parent ec30b461f3
commit 1221b9e982
1 changed files with 7 additions and 5 deletions
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12
drivers/block/ublk_drv.c
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@ -605,14 +605,16 @@ static inline bool ublk_need_get_data(const struct ublk_queue *ubq)
return ubq->flags & UBLK_F_NEED_GET_DATA;
}
static struct ublk_device *ublk_get_device(struct ublk_device *ub)
/* Called in slow path only, keep it noinline for trace purpose */
static noinline struct ublk_device *ublk_get_device(struct ublk_device *ub)
{
if (kobject_get_unless_zero(&ub->cdev_dev.kobj))
return ub;
return NULL;
}
static void ublk_put_device(struct ublk_device *ub)
/* Called in slow path only, keep it noinline for trace purpose */
static noinline void ublk_put_device(struct ublk_device *ub)
{
put_device(&ub->cdev_dev);
}
@ -671,7 +673,7 @@ static void ublk_free_disk(struct gendisk *disk)
struct ublk_device *ub = disk->private_data;
clear_bit(UB_STATE_USED, &ub->state);
put_device(&ub->cdev_dev);
ublk_put_device(ub);
}
static void ublk_store_owner_uid_gid(unsigned int *owner_uid,
@ -2142,7 +2144,7 @@ static void ublk_remove(struct ublk_device *ub)
cancel_work_sync(&ub->stop_work);
cancel_work_sync(&ub->quiesce_work);
cdev_device_del(&ub->cdev, &ub->cdev_dev);
put_device(&ub->cdev_dev);
ublk_put_device(ub);
ublks_added--;
}
@ -2235,7 +2237,7 @@ static int ublk_ctrl_start_dev(struct ublk_device *ub, struct io_uring_cmd *cmd)
if (ub->nr_privileged_daemon != ub->nr_queues_ready)
set_bit(GD_SUPPRESS_PART_SCAN, &disk->state);
get_device(&ub->cdev_dev);
ublk_get_device(ub);
ub->dev_info.state = UBLK_S_DEV_LIVE;
if (ublk_dev_is_zoned(ub)) {