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block/export: don't require AioContext lock around blk_exp_ref/unref()

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The FUSE export calls blk_exp_ref/unref() without the AioContext lock.
Instead of fixing the FUSE export, adjust blk_exp_ref/unref() so they
work without the AioContext lock. This way it's less error-prone.

Suggested-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Message-Id: <20230516190238.8401-15-stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Stefan Hajnoczi 2023-05-16 15:02:32 -04:00 • committed by Kevin Wolf
parent 195332c1d9
commit 3d499a43a2
3 changed files with 8 additions and 11 deletions
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2
include/block/export.h
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@ -57,6 +57,8 @@ struct BlockExport {
* Reference count for this block export. This includes strong references
* both from the owner (qemu-nbd or the monitor) and clients connected to
* the export.
*
* Use atomics to access this field.
*/
int refcount;