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From: George Dunlap <george.dunlap@citrix.com>
To: xen-devel@lists.xen.org
Cc: Ian Jackson <ian.jackson@citrix.com>,
	Wei Liu <wei.liu2@citrix.com>,
	George Dunlap <george.dunlap@citrix.com>,
	Roger Pau Monne <roger.pau@citrix.com>
Subject: [PATCH v2 2/9] libxl: Remove redundant setting of phyical-device
Date: Mon, 21 Mar 2016 18:16:54 +0000	[thread overview]
Message-ID: <1458584221-24426-3-git-send-email-george.dunlap@citrix.com> (raw)
In-Reply-To: <1458584221-24426-1-git-send-email-george.dunlap@citrix.com>

Regardless of whether we're running a custom hotplug script or using
normal phy: or file:, the "block" script will be run, which will set
all the necessary xenstore nodes.

In fact, writing this value here prevents the block script from
accomplishing its only purpose: to detect duplicate physical block
devices used in different virtual devices.  The first thing the block
script does is check to see if this node is written; and if it is, it
silently exits.

Remove this, and let the block script perform its duplicate checking

Signed-off-by: George Dunlap <george.dunlap@citrix.com>
Acked-by: Ian Jackson <ian.jackson@eu.citrix.com>
NOTE: It's likely that the duplicate checking for physical devices has
never been run under libxl (at least since this bug was introduced);
this may shake out some issues.

CC: Ian Jackson <ian.jackson@citrix.com>
CC: Wei Liu <wei.liu2@citrix.com>
CC: Roger Pau Monne <roger.pau@citrix.com>
 tools/libxl/libxl.c | 15 ---------------
 1 file changed, 15 deletions(-)

diff --git a/tools/libxl/libxl.c b/tools/libxl/libxl.c
index 3471c4c..93f50d3 100644
--- a/tools/libxl/libxl.c
+++ b/tools/libxl/libxl.c
@@ -2440,21 +2440,6 @@ static void device_disk_add(libxl__egc *egc, uint32_t domid,
                 flexarray_append_pair(back, "script", script);
-                /* If the user did not supply a block script then we
-                 * write the physical-device node ourselves.
-                 *
-                 * If the user did supply a script then that script is
-                 * responsible for this since the block device may not
-                 * exist yet.
-                 */
-                if (!disk->script &&
-                    disk->backend_domid == LIBXL_TOOLSTACK_DOMID) {
-                    int major, minor;
-                    if (!libxl__device_physdisk_major_minor(dev, &major, &minor))
-                        flexarray_append_pair(back, "physical-device",
-                                              GCSPRINTF("%x:%x", major, minor));
-                }
                 assert(device->backend_kind == LIBXL__DEVICE_KIND_VBD);

Xen-devel mailing list

  parent reply	other threads:[~2016-03-21 18:16 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-03-21 18:16 [PATCH v2 0/9] tools: Allow HVM domains emulated access to disks provided by hotplug scripts George Dunlap
2016-03-21 18:16 ` [PATCH v2 1/9] tools/hotplug: Add a "dummy" hotplug script for testing George Dunlap
2016-03-21 18:16 ` George Dunlap [this message]
2016-03-21 18:16 ` [PATCH v2 3/9] tools/hotplug: Write physical-device-path in addition to physical-device George Dunlap
2016-03-21 18:16 ` [PATCH v2 4/9] libxl: Move check for local access to a funciton George Dunlap
2016-03-21 18:16 ` [PATCH v2 5/9] libxl: Rearrange qemu upstream disk argument code George Dunlap
2016-03-21 18:16 ` [PATCH v2 6/9] libxl: Share logic for finding path between qemuu and pygrub George Dunlap
2016-03-22 10:38   ` George Dunlap
2016-03-21 18:16 ` [PATCH v2 7/9] libxl: Allow local access for block devices with hotplug scripts George Dunlap
2016-03-21 18:17 ` [PATCH v2 8/9] docs: Document block-script protocol George Dunlap
2016-03-22 12:52   ` Roger Pau Monné
2016-03-23 11:19     ` George Dunlap
2016-03-23 12:14       ` Roger Pau Monné
2016-03-24 16:29         ` George Dunlap
2016-03-24 16:51           ` Roger Pau Monné
2016-03-21 18:17 ` [PATCH v2 9/9] DO NOT APPLY libxl: Change hotplug script interface to use physical-device-path George Dunlap
2016-03-23 10:10 ` [PATCH v2 0/9] tools: Allow HVM domains emulated access to disks provided by hotplug scripts Roger Pau Monné
2016-03-23 10:36   ` George Dunlap

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