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blockdev: use drained_begin/end for qmp_block_resize

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Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=1447551

If one tries to issue a block_resize while a guest is busy
accessing the disk, it is possible that qemu may deadlock
when invoking aio_poll from both the main loop and the iothread.

Replace another instance of bdrv_drain_all that doesn't
quite belong.

Cc: qemu-stable@nongnu.org
Suggested-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
John Snow 2017-05-10 13:39:45 -04:00 committed by Kevin Wolf
parent c03e7ef12a
commit 698bdfa07d
1 changed files with 2 additions and 3 deletions
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blockdev.c
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@ -2923,10 +2923,9 @@ void qmp_block_resize(bool has_device, const char *device,
goto out;
}
/* complete all in-flight operations before resizing the device */
bdrv_drain_all();
bdrv_drained_begin(bs);
ret = blk_truncate(blk, size, errp);
bdrv_drained_end(bs);
out:
blk_unref(blk);