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throttle: acquire the ThrottleGroup lock in bdrv_swap()

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bdrv_swap() touches the fields of a BlockDriverState that are
protected by the ThrottleGroup lock. Although those fields end up in
their original place, they are temporarily swapped in the process,
so there's a chance that an operation on a member of the same group
happening on a different thread can try to use them.

Signed-off-by: Alberto Garcia <berto@igalia.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: d92dc40d7c4f1fc5cda5cbbf4ffb7a4670b79d17.1433779731.git.berto@igalia.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Alberto Garcia
2015-06-08 18:17:45 +02:00
committed by Stefan Hajnoczi
parent 76f4afb40f
commit db6283385c
3 changed files with 49 additions and 1 deletions
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3
include/block/throttle-groups.h
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@ -40,4 +40,7 @@ void coroutine_fn throttle_group_co_io_limits_intercept(BlockDriverState *bs,
unsigned int bytes,
bool is_write);
void throttle_group_lock(BlockDriverState *bs);
void throttle_group_unlock(BlockDriverState *bs);
#endif