[Libvirt-cim] [PATCH 2 of 3] Allow device_parsing modules to return multiple devices per cycle
Dan Smith
danms at us.ibm.com
Tue Jan 8 20:24:04 UTC 2008
# HG changeset patch
# User Dan Smith <danms at us.ibm.com>
# Date 1199827433 28800
# Node ID 3e5265023ddda5cfa24e7449c9f06bbd7dcaba5c
# Parent 7272934dc44185bef3923c86fa19961d299518fd
Allow device_parsing modules to return multiple devices per cycle
Do this by growing the device list during the cycle instead of
trying to predict it ahead of time based on the numbers of nodes
in the XML tree. This could be a little nicer with a more integrated
list structure or a linked-list of some kind, but this is the
smallest change to accomplish the goal, which I think is a good idea
for now.
The need for this is apparent in the next patch for vcpu parsing.
Signed-off-by: Dan Smith <danms at us.ibm.com>
diff -r 7272934dc441 -r 3e5265023ddd libxkutil/device_parsing.c
--- a/libxkutil/device_parsing.c Tue Jan 08 13:23:53 2008 -0800
+++ b/libxkutil/device_parsing.c Tue Jan 08 13:23:53 2008 -0800
@@ -130,12 +130,17 @@ static char *get_node_content(xmlNode *n
return buf;
}
-static bool parse_disk_device(xmlNode *dnode, struct virt_device *vdev)
-{
- struct disk_device *ddev = &(vdev->dev.disk);
+static int parse_disk_device(xmlNode *dnode, struct virt_device **vdevs)
+{
+ struct virt_device *vdev = NULL;
+ struct disk_device *ddev = NULL;
xmlNode * child = NULL;
- memset(ddev, 0, sizeof(*ddev));
+ vdev = calloc(1, sizeof(*vdev));
+ if (vdev == NULL)
+ goto err;
+
+ ddev = &(vdev->dev.disk);
ddev->type = get_attr_value(dnode, "type");
if (ddev->type == NULL)
@@ -174,20 +179,28 @@ static bool parse_disk_device(xmlNode *d
vdev->type = VIRT_DEV_DISK;
vdev->id = strdup(ddev->virtual_dev);
- return true;
+ *vdevs = vdev;
+
+ return 1;
err:
cleanup_disk_device(ddev);
-
- return false;
-}
-
-static bool parse_net_device(xmlNode *inode, struct virt_device *vdev)
-{
- struct net_device *ndev = &(vdev->dev.net);
+ free(vdev);
+
+ return 0;
+}
+
+static int parse_net_device(xmlNode *inode, struct virt_device **vdevs)
+{
+ struct virt_device *vdev = NULL;
+ struct net_device *ndev = NULL;
xmlNode *child = NULL;
- memset(ndev, 0, sizeof(*ndev));
+ vdev = calloc(1, sizeof(*vdev));
+ if (vdev == NULL)
+ goto err;
+
+ ndev = &(vdev->dev.net);
ndev->type = get_attr_value(inode, "type");
if (ndev->type == NULL)
@@ -216,16 +229,26 @@ static bool parse_net_device(xmlNode *in
vdev->type = VIRT_DEV_NET;
vdev->id = strdup(ndev->mac);
- return true;
+ *vdevs = vdev;
+
+ return 1;
err:
cleanup_net_device(ndev);
-
- return false;
-}
-
-static bool parse_emu_device(xmlNode *node, struct virt_device *vdev)
-{
- struct emu_device *edev = &(vdev->dev.emu);
+ free(vdev);
+
+ return 0;
+}
+
+static int parse_emu_device(xmlNode *node, struct virt_device **vdevs)
+{
+ struct virt_device *vdev = NULL;
+ struct emu_device *edev = NULL;
+
+ vdev = calloc(1, sizeof(*vdev));
+ if (vdev == NULL)
+ goto err;
+
+ edev = &(vdev->dev.emu);
edev->path = get_node_content(node);
if (edev->path != NULL)
@@ -233,16 +256,26 @@ static bool parse_emu_device(xmlNode *no
vdev->type = VIRT_DEV_EMU;
- return true;
+ *vdevs = vdev;
+
+ return 1;
err:
cleanup_emu_device(edev);
-
- return false;
-}
-
-static bool parse_graphics_device(xmlNode *node, struct virt_device *vdev)
-{
- struct graphics_device *gdev = &(vdev->dev.graphics);
+ free(vdev);
+
+ return 0;
+}
+
+static int parse_graphics_device(xmlNode *node, struct virt_device **vdevs)
+{
+ struct virt_device *vdev = NULL;
+ struct graphics_device *gdev = NULL;
+
+ vdev = calloc(1, sizeof(*vdev));
+ if (vdev == NULL)
+ goto err;
+
+ gdev = &(vdev->dev.graphics);
gdev->type = get_attr_value(node, "type");
gdev->port = get_attr_value(node, "port");
@@ -252,21 +285,37 @@ static bool parse_graphics_device(xmlNod
vdev->type = VIRT_DEV_GRAPHICS;
- return true;
+ *vdevs = vdev;
+
+ return 1;
err:
cleanup_graphics_device(gdev);
-
- return false;
+ free(vdev);
+
+ return 0;
+}
+
+static bool resize_devlist(struct virt_device **list, int newsize)
+{
+ struct virt_device *_list;
+
+ _list = realloc(*list, newsize * sizeof(struct virt_device));
+ if (_list == NULL)
+ return false;
+
+ *list = _list;
+
+ return true;
}
static int do_parse(xmlNodeSet *nsv, int type, struct virt_device **l)
{
int devidx;
- int lstidx;
+ int lstidx = 0;
int count = 0;
struct virt_device *list = NULL;
xmlNode **dev_nodes = NULL;
- bool (*do_real_parse)(xmlNode *, struct virt_device *) = NULL;
+ int (*do_real_parse)(xmlNode *, struct virt_device **) = NULL;
/* point to correct parser function according to type */
if (type == VIRT_DEV_NET)
@@ -289,27 +338,32 @@ static int do_parse(xmlNodeSet *nsv, int
if (count <= 0)
goto out;
- list = (struct virt_device *)malloc(count * sizeof(struct virt_device));
- if (list == NULL) {
- count = 0;
- goto out;
- }
-
/* walk thru the array, do real parsing on each node */
- lstidx = 0;
for (devidx = 0; devidx < count; devidx++) {
- if (do_real_parse(dev_nodes[devidx], &list[lstidx]))
- lstidx++;
- }
-
- if (lstidx < devidx) {
- list = realloc(list, lstidx * sizeof(struct virt_device));
- count = lstidx;
+ struct virt_device *tmp_list = NULL;
+ int devices = 0;
+
+ devices = do_real_parse(dev_nodes[devidx], &tmp_list);
+ if (devices <= 0)
+ continue;
+
+ if (!resize_devlist(&list, lstidx + devices)) {
+ /* Skip these devices and try again for the
+ * next cycle, which will probably fail, but
+ * what else can you do?
+ */
+ goto end;
+ }
+
+ memcpy(&list[lstidx], tmp_list, devices * sizeof(*tmp_list));
+ lstidx += devices;
+ end:
+ free(tmp_list);
}
out:
*l = list;
- return count;
+ return lstidx;
}
/* Dummy function to suppress error message from libxml2 */
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