[Xen-devel] [PATCH 18 of 29 RFC] libxl: introduce libxl__device_generic_hotplug_add

[Roger Pau Monne <roger.pau@xxxxxxxxxxxxx>]

# HG changeset patch
# User Roger Pau Monne <roger.pau@xxxxxxxxxxxxx>
# Date 1328178447 -3600
# Node ID 94733bc9cc2fbeaa08a660ec90dcd9c5ad924e1b
# Parent  6a6e7a195412935609c18bc7d52767f41521875b
libxl: introduce libxl__device_generic_hotplug_add

Add an array of xenstore entries for the given libxl__device to
xenstore.

Signed-off-by: Roger Pau Monne <roger.pau@xxxxxxxxxxxxx>

diff -r 6a6e7a195412 -r 94733bc9cc2f tools/libxl/libxl_device.c
--- a/tools/libxl/libxl_device.c        Thu Feb 02 11:24:27 2012 +0100
+++ b/tools/libxl/libxl_device.c        Thu Feb 02 11:27:27 2012 +0100
@@ -118,6 +118,42 @@ retry_transaction:
     return 0;
 }
 
+int libxl__device_generic_hotplug_add(libxl__gc *gc, libxl__device *device,
+                                      char **hents)
+{
+    libxl_ctx *ctx = libxl__gc_owner(gc);
+    char *hotplug_path;
+    xs_transaction_t t;
+    struct xs_permissions hotplug_perms[2];
+
+    hotplug_path = libxl__device_hotplug_path(gc, device);
+
+    hotplug_perms[0].id = 0;
+    hotplug_perms[0].perms = XS_PERM_NONE;
+    hotplug_perms[1].id = device->backend_domid;
+    hotplug_perms[1].perms = XS_PERM_NONE;
+
+retry_transaction:
+    t = xs_transaction_start(ctx->xsh);
+
+    if (hents) {
+        xs_rm(ctx->xsh, t, hotplug_path);
+        xs_mkdir(ctx->xsh, t, hotplug_path);
+        xs_set_permissions(ctx->xsh, t, hotplug_path, hotplug_perms,
+                           ARRAY_SIZE(hotplug_perms));
+        libxl__xs_writev(gc, t, hotplug_path, hents);
+    }
+
+    if (!xs_transaction_end(ctx->xsh, t, 0)) {
+        if (errno == EAGAIN)
+            goto retry_transaction;
+        else
+            LIBXL__LOG_ERRNO(ctx, LIBXL__LOG_ERROR, "xs transaction failed");
+    }
+
+    return 0;
+}
+
 typedef struct {
     libxl__gc *gc;
     libxl_device_disk *disk;
diff -r 6a6e7a195412 -r 94733bc9cc2f tools/libxl/libxl_internal.h
--- a/tools/libxl/libxl_internal.h      Thu Feb 02 11:24:27 2012 +0100
+++ b/tools/libxl/libxl_internal.h      Thu Feb 02 11:27:27 2012 +0100
@@ -299,6 +299,9 @@ typedef struct {
 
 _hidden int libxl__device_generic_add(libxl__gc *gc, libxl__device *device,
                              char **bents, char **fents);
+_hidden int libxl__device_generic_hotplug_add(libxl__gc *gc,
+                                              libxl__device *device,
+                                              char **hents);
 _hidden char *libxl__device_backend_path(libxl__gc *gc, libxl__device *device);
 _hidden char *libxl__device_frontend_path(libxl__gc *gc, libxl__device 
*device);
 _hidden char *libxl__device_hotplug_path(libxl__gc *gc, libxl__device *device);

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