io_uring/rsrc: Simplify buffer cloning by locking both rings

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The locking in the buffer cloning code is somewhat complex because it goes
back and forth between locking the source ring and the destination ring.

Make it easier to reason about by locking both rings at the same time.
To avoid ABBA deadlocks, lock the rings in ascending kernel address order,
just like in lock_two_nondirectories().

Signed-off-by: Jann Horn <jannh@google.com>
Link: https://lore.kernel.org/r/20250115-uring-clone-refactor-v2-1-7289ba50776d@google.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

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Jann Horn 2025-01-15 21:26:03 +01:00 • committed by Jens Axboe

parent 95ec54a420

commit 5719e28235

1 changed files with 40 additions and 33 deletions

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io_uring/rsrc.c

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