rbd: protect read of snapshot sequence number
This is updated whenever a snapshot is added or deleted, and the snapc pointer is changed with every refresh of the header. Signed-off-by: Josh Durgin <josh.durgin@dreamhost.com> Reviewed-by: Alex Elder <elder@dreamhost.com> Reviewed-by: Yehuda Sadeh <yehuda@hq.newdream.net>
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@ -1684,7 +1684,9 @@ static int rbd_header_add_snap(struct rbd_device *dev,
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if (ret < 0)
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return ret;
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dev->header.snapc->seq = new_snapid;
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down_write(&dev->header_rwsem);
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dev->header.snapc->seq = new_snapid;
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up_write(&dev->header_rwsem);
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return 0;
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bad:
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