ublk: allow buffer registration before device is started

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Before START_DEV, there is no disk, no queue, no I/O dispatch, so
the maple tree can be safely modified under ub->mutex alone without
freezing the queue.

Add ublk_lock_buf_tree()/ublk_unlock_buf_tree() helpers that take
ub->mutex first, then freeze the queue if device is started. This
ordering (mutex -> freeze) is safe because ublk_stop_dev_unlocked()
already holds ub->mutex when calling del_gendisk() which freezes
the queue.

Suggested-by: Caleb Sander Mateos <csander@purestorage.com>
Signed-off-by: Ming Lei <tom.leiming@gmail.com>
Link: https://patch.msgid.link/20260409133020.3780098-6-tom.leiming@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

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Ming Lei 2026-04-09 21:30:17 +08:00 • committed by Jens Axboe

parent 5e864438e2

commit 365ea7cc62

1 changed files with 28 additions and 51 deletions

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79

drivers/block/ublk_drv.c

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