rbd: make discard trigger copy-on-write
Discard requests are a form of write, so they should go through the same process as plain write requests and trigger copy-on-write for layered images. Signed-off-by: Josh Durgin <josh.durgin@inktank.com>
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@ -2851,7 +2851,8 @@ static bool img_obj_request_simple(struct rbd_obj_request *obj_request)
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rbd_dev = img_request->rbd_dev;
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/* Reads */
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if (!img_request_write_test(img_request))
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if (!img_request_write_test(img_request) &&
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!img_request_discard_test(img_request))
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return true;
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/* Non-layered writes */
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