[Xen-devel] [PATCH 09 of 11] blktap2: only open driver stack once

[Brendan Cully <brendan@xxxxxxxxx>]

# HG changeset patch
# User Ryan O'Connor <rjo@xxxxxxxxx>
# Date 1252530408 25200
# Node ID b14bb76b36dd239586b41c47e6f2531cbcbf4b47
# Parent  4ca00ee41ce9731b8725c736b27c841b484dce5d
blktap2: only open driver stack once

Currently blktap2 opens a driver stack, closes it, and re-opens it. This
causes problems with our remus driver: the primary may connect to the
backup in between the first and second open.

This is a temporary fix.

Signed-off-by: Ryan O'Connor <rjo@xxxxxxxxx>

diff --git a/tools/blktap2/drivers/tapdisk-vbd.c 
b/tools/blktap2/drivers/tapdisk-vbd.c
--- a/tools/blktap2/drivers/tapdisk-vbd.c
+++ b/tools/blktap2/drivers/tapdisk-vbd.c
@@ -1561,9 +1561,11 @@
        gettimeofday(&vreq->last_try, NULL);
        tapdisk_vbd_move_request(vreq, &vbd->pending_requests);
 
+#if 0
        err = tapdisk_vbd_check_queue(vbd);
        if (err)
                goto fail;
+#endif
 
        err = tapdisk_image_check_ring_request(image, req);
        if (err)

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