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blktap2: make protocol specific usage of shared sring explicit
I don't think protocol specific data really belongs in this header but since it is already there and we seem to be stuck with it let's at least make the users explicit lest people get caught out by future new fields moving the pad field around. This is the Xen portion of this change. The kernel portion will be sent separately. There is no dependency between the two. Signed-off-by: Ian Campbell <ian.campbell@citrix.com> Cc: Jeremy Fitzhardinge <jeremy@goop.org> Cc: Daniel Stodden <daniel.stodden@citrix.com> Cc: Dongxiao Xu <dongxiao.xu@intel.com>
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Keir Fraser committed
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@@ -1684,7 +1684,7 @@ tapdisk_vbd_check_ring_message(td_vbd_t *vbd)
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if (!vbd->ring.sring)
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return -EINVAL;
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switch (vbd->ring.sring->pad[0]) {
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switch (vbd->ring.sring->private.tapif_user.msg) {
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case 0:
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return 0;
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@@ -103,8 +103,16 @@ union __name##_sring_entry { \
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struct __name##_sring { \
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RING_IDX req_prod, req_event; \
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RING_IDX rsp_prod, rsp_event; \
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uint8_t netfront_smartpoll_active; \
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uint8_t pad[47]; \
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union { \
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struct { \
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uint8_t smartpoll_active; \
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} netif; \
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struct { \
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uint8_t msg; \
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} tapif_user; \
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uint8_t pvt_pad[4]; \
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} private; \
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uint8_t pad[44]; \
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union __name##_sring_entry ring[1]; /* variable-length */ \
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}; \
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\
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