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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH 12 of 13 RFC] libxl: add hotplug script calls for Linux
# HG changeset patch
# User Roger Pau Monne <roger.pau@xxxxxxxxxxxxx>
# Date 1326729329 -3600
# Node ID 6e076ded8be36a90c6c1e0fb3172bc22011a80b6
# Parent d0eb0f3a305fbcdb5fca853e7c674b9b59719e4a
libxl: add hotplug script calls for Linux
This patchs adds the necessary logic to call hotplug scripts directly
from libxl. Linux hotplug scritps read most parameters from the caller
environment (since udev set this parameters automatically). In this
implementation we fake udev parameters, so no changes are needed to
the scripts itself.
Currently, the following scripts are called:
* block: used when disk backend is PHY.
* blktap: used when disk backend is TAP.
* vif-*: used when adding a network interface and can be manually set
by the user.
This patchs disables some udev rules, to prevent udev from trying to
execute hotplug scripts for the devices listed above.
udev rules descrive more device types, currently the following scripts
are NOT executed from libxl because I wasn't able to find any support
for this device types in libxl:
* vtpm
* vif2
* vscsi
* vif-setup with devices of type tap*
Signed-off-by: Roger Pau Monne <roger.pau@xxxxxxxxxxxxx>
diff -r d0eb0f3a305f -r 6e076ded8be3 tools/hotplug/Linux/xen-backend.rules
--- a/tools/hotplug/Linux/xen-backend.rules Mon Jan 16 16:44:12 2012 +0100
+++ b/tools/hotplug/Linux/xen-backend.rules Mon Jan 16 16:55:29 2012 +0100
@@ -1,11 +1,11 @@
-SUBSYSTEM=="xen-backend", KERNEL=="tap*", RUN+="/etc/xen/scripts/blktap
$env{ACTION}"
-SUBSYSTEM=="xen-backend", KERNEL=="vbd*", RUN+="/etc/xen/scripts/block
$env{ACTION}"
+# SUBSYSTEM=="xen-backend", KERNEL=="tap*", RUN+="/etc/xen/scripts/blktap
$env{ACTION}"
+# SUBSYSTEM=="xen-backend", KERNEL=="vbd*", RUN+="/etc/xen/scripts/block
$env{ACTION}"
SUBSYSTEM=="xen-backend", KERNEL=="vtpm*", RUN+="/etc/xen/scripts/vtpm
$env{ACTION}"
SUBSYSTEM=="xen-backend", KERNEL=="vif2-*", RUN+="/etc/xen/scripts/vif2
$env{ACTION}"
-SUBSYSTEM=="xen-backend", KERNEL=="vif-*", ACTION=="online",
RUN+="/etc/xen/scripts/vif-setup online type_if=vif"
-SUBSYSTEM=="xen-backend", KERNEL=="vif-*", ACTION=="offline",
RUN+="/etc/xen/scripts/vif-setup offline type_if=vif"
+# SUBSYSTEM=="xen-backend", KERNEL=="vif-*", ACTION=="online",
RUN+="/etc/xen/scripts/vif-setup online type_if=vif"
+# SUBSYSTEM=="xen-backend", KERNEL=="vif-*", ACTION=="offline",
RUN+="/etc/xen/scripts/vif-setup offline type_if=vif"
SUBSYSTEM=="xen-backend", KERNEL=="vscsi*", RUN+="/etc/xen/scripts/vscsi
$env{ACTION}"
-SUBSYSTEM=="xen-backend", ACTION=="remove",
RUN+="/etc/xen/scripts/xen-hotplug-cleanup"
+# SUBSYSTEM=="xen-backend", ACTION=="remove",
RUN+="/etc/xen/scripts/xen-hotplug-cleanup"
KERNEL=="evtchn", NAME="xen/%k"
SUBSYSTEM=="xen", KERNEL=="blktap[0-9]*", NAME="xen/%k", MODE="0600"
SUBSYSTEM=="blktap2", KERNEL=="blktap[0-9]*", NAME="xen/blktap-2/%k",
MODE="0600"
diff -r d0eb0f3a305f -r 6e076ded8be3 tools/libxl/libxl_linux.c
--- a/tools/libxl/libxl_linux.c Mon Jan 16 16:44:12 2012 +0100
+++ b/tools/libxl/libxl_linux.c Mon Jan 16 16:55:29 2012 +0100
@@ -26,10 +26,172 @@ int libxl__try_phy_backend(mode_t st_mod
return 1;
}
+/* Hotplug scripts helpers */
+
+static char **get_hotplug_env(libxl__gc *gc, libxl__device *dev)
+{
+ libxl_ctx *ctx = libxl__gc_owner(gc);
+ char *be_path = libxl__device_backend_path(gc, dev);
+ flexarray_t *f_env;
+ int nr = 0;
+
+ f_env = flexarray_make(11, 1);
+ if (!f_env) {
+ LIBXL__LOG(ctx, LIBXL__LOG_ERROR,
+ "unable to create environment array");
+ return NULL;
+ }
+
+ flexarray_set(f_env, nr++, "script");
+ flexarray_set(f_env, nr++, libxl__xs_read(gc, XBT_NULL,
+ libxl__sprintf(gc, "%s/%s",
+ be_path,
+ "script")));
+ flexarray_set(f_env, nr++, "XENBUS_TYPE");
+ flexarray_set(f_env, nr++, (char *)
+ libxl__device_kind_to_string(dev->backend_kind));
+ flexarray_set(f_env, nr++, "XENBUS_PATH");
+ flexarray_set(f_env, nr++,
+ libxl__sprintf(gc, "backend/%s/%u/%d",
+ libxl__device_kind_to_string(dev->backend_kind),
+ dev->domid, dev->devid));
+ flexarray_set(f_env, nr++, "XENBUS_BASE_PATH");
+ flexarray_set(f_env, nr++, "backend");
+ if (dev->backend_kind == LIBXL__DEVICE_KIND_VIF) {
+ flexarray_set(f_env, nr++, "vif");
+ flexarray_set(f_env, nr++,
+ libxl__sprintf(gc, "%s%u.%d",
+ libxl__device_kind_to_string(dev->backend_kind),
+ dev->domid, dev->devid));
+ }
+ flexarray_set(f_env, nr++, NULL);
+
+ return (char **) flexarray_contents(f_env);
+}
+
/* Hotplug scripts caller functions */
+static int libxl__hotplug_nic(libxl__gc *gc, libxl__device *dev,
+ libxl__hotplug_action action)
+{
+ libxl_ctx *ctx = libxl__gc_owner(gc);
+ char *be_path = libxl__device_backend_path(gc, dev);
+ char *script, *what;
+ char **args, **env;
+ int status, nr = 0;
+ int rc = -1;
+ flexarray_t *f_args;
+
+ script = libxl__xs_read(gc, XBT_NULL,
+ libxl__sprintf(gc, "%s/%s", be_path, "script"));
+ if (!script) {
+ LIBXL__LOG(ctx, LIBXL__LOG_ERROR, "unable to read script from %s",
+ be_path);
+ return -1;
+ }
+
+ env = get_hotplug_env(gc, dev);
+ if (!env)
+ return -1;
+
+ f_args = flexarray_make(4, 1);
+ if (!f_args) {
+ LIBXL__LOG(ctx, LIBXL__LOG_ERROR, "unable to create arguments array");
+ return -1;
+ }
+
+ flexarray_set(f_args, nr++, script);
+ flexarray_set(f_args, nr++, action == CONNECT ? "online" : "offline");
+ flexarray_set(f_args, nr++, "type_if=vif");
+ flexarray_set(f_args, nr++, NULL);
+
+ args = (char **) flexarray_contents(f_args);
+ what = libxl__sprintf(gc, "%s %s", args[0],
+ action == CONNECT ? "connect" : "disconnect");
+ LIBXL__LOG(ctx, LIBXL__LOG_DEBUG,
+ "Calling hotplug script: %s %s %s",
+ args[0], args[1], args[2]);
+ status = libxl__forkexec(gc, -1, -1, -1, args[0], args, env, what);
+ if (status) {
+ rc = -1;
+ goto out;
+ }
+ rc = 0;
+
+out:
+ free(env);
+ free(args);
+ return rc;
+}
+
+static int libxl__hotplug_disk(libxl__gc *gc, libxl__device *dev,
+ libxl__hotplug_action action)
+{
+ libxl_ctx *ctx = libxl__gc_owner(gc);
+ char *be_path = libxl__device_backend_path(gc, dev);
+ char *script, *what;
+ char **args, **env;
+ int status, nr = 0;
+ int rc = -1;
+ flexarray_t *f_args;
+
+ script = libxl__xs_read(gc, XBT_NULL,
+ libxl__sprintf(gc, "%s/%s", be_path, "script"));
+ if (!script) {
+ LIBXL__LOG(ctx, LIBXL__LOG_ERROR, "unable to read script from %s",
+ be_path);
+ return -1;
+ }
+
+ env = get_hotplug_env(gc, dev);
+ if (!env)
+ return -1;
+
+ f_args = flexarray_make(3, 1);
+ if (!f_args) {
+ LIBXL__LOG(ctx, LIBXL__LOG_ERROR, "unable to create arguments array");
+ return -1;
+ }
+
+ flexarray_set(f_args, nr++, script);
+ flexarray_set(f_args, nr++, action == CONNECT ? "add" : "remove");
+ flexarray_set(f_args, nr++, NULL);
+
+ args = (char **) flexarray_contents(f_args);
+ what = libxl__sprintf(gc, "%s %s", args[0],
+ action == CONNECT ? "connect" : "disconnect");
+ LIBXL__LOG(ctx, LIBXL__LOG_DEBUG,
+ "Calling hotplug script: %s %s",
+ args[0], args[1]);
+ status = libxl__forkexec(gc, -1, -1, -1, args[0], args, env, what);
+ if (status) {
+ rc = -1;
+ goto out;
+ }
+ rc = 0;
+
+out:
+ free(env);
+ free(args);
+ return rc;
+}
+
int libxl__device_hotplug(libxl__gc *gc, libxl__device *dev,
- libxl__hotplug_action action)
+ libxl__hotplug_action action)
{
- return 0;
+ int rc = 0;
+
+ switch (dev->backend_kind) {
+ case LIBXL__DEVICE_KIND_VIF:
+ rc = libxl__hotplug_nic(gc, dev, action);
+ break;
+ case LIBXL__DEVICE_KIND_VBD:
+ rc = libxl__hotplug_disk(gc, dev, action);
+ break;
+ default:
+ rc = 0;
+ break;
+ }
+
+ return rc;
}
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