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When iothreads are in use, the failure to grab the aio context results in an assertion failure when trying to unlock things during blk_unref, when trying to unlock a mutex that was not locked. In short, all calls to nbd_export_put need to done while within the correct aio context. But since nbd_export_put can recursively reach itself via nbd_export_close, and recursively grabbing the context would deadlock, we can't do the context grab directly in those functions, but must do so in their callers. Hoist the use of the correct aio_context from nbd_export_new() to its caller qmp_nbd_server_add(). Then tweak qmp_nbd_server_remove(), nbd_eject_notifier(), and nbd_esport_close_all() to grab the right context, so that all callers during qemu now own the context before nbd_export_put() can call blk_unref(). Remaining uses in qemu-nbd don't matter (since that use case does not support iothreads). Suggested-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Eric Blake <eblake@redhat.com> Message-Id: <20190917023917.32226-1-eblake@redhat.com> Reviewed-by: Sergio Lopez <slp@redhat.com> |
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| .. | ||
| accounting.h | ||
| aio-wait.h | ||
| aio.h | ||
| block_backup.h | ||
| block_int.h | ||
| block.h | ||
| blockjob_int.h | ||
| blockjob.h | ||
| dirty-bitmap.h | ||
| nbd.h | ||
| nvme.h | ||
| qapi.h | ||
| qdict.h | ||
| raw-aio.h | ||
| snapshot.h | ||
| thread-pool.h | ||
| throttle-groups.h | ||
| write-threshold.h | ||