block: ublk: improve handling device deletion

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Inside ublk_ctrl_del_dev(), when the device is removed, we wait
until the device number is freed with holding global lock of
ublk_ctl_mutex, this way isn't friendly from user viewpoint:

1) if device is in-use, the current delete command hangs in
ublk_ctrl_del_dev(), and user can't break from the handling
because wait_event() is used

2) global lock is held, so any new device can't be added and
other old devices can't be removed.

Improve the deleting handling by the following way, suggested by
Nadav:

1) wait without holding the global lock

2) replace wait_event() with wait_event_interruptible()

Reported-by: Nadav Amit <nadav.amit@gmail.com>
Suggested-by: Nadav Amit <nadav.amit@gmail.com>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Link: https://lore.kernel.org/r/20230207150700.545530-1-ming.lei@redhat.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

...

This commit is contained in:

Ming Lei 2023-02-07 23:07:00 +08:00 • committed by Jens Axboe

parent f37bf75ca7

commit 0abe39dec0

1 changed files with 18 additions and 4 deletions

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drivers/block/ublk_drv.c

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