[pve-devel] [PATCH qemu v2 01/49] PVE backup: prepare for the switch to using blockdev rather than drive

[Fiona Ebner]

Also allow finding block nodes by their node name rather than just via
an associated block backend, which might not exist for block nodes.

For regular drives, it is essential to not use the throttle group,
because otherwise the limits intended only for the guest would also
apply to the backup job.

Signed-off-by: Fiona Ebner <f.ebner at proxmox.com>
---
 pve-backup.c | 51 +++++++++++++++++++++++++++++++++++++++------------
 1 file changed, 39 insertions(+), 12 deletions(-)

diff --git a/pve-backup.c b/pve-backup.c
index 0450303017..457fcb7e5c 100644
--- a/pve-backup.c
+++ b/pve-backup.c
@@ -847,29 +847,56 @@ static PVEBackupDevInfo coroutine_fn GRAPH_RDLOCK *get_single_device_info(
     Error **errp)
 {
     BlockBackend *blk = blk_by_name(device);
-    if (!blk) {
-        error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
-                  "Device '%s' not found", device);
-        return NULL;
+    BlockDriverState *root_bs, *bs;
+
+    if (blk) {
+        root_bs = bs = blk_bs(blk);
+    } else {
+        /* TODO PVE 10 - fleecing will always be attached without blk */
+        root_bs = bs = bdrv_find_node(device);
+        if (!bs) {
+            error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
+                      "Device '%s' not found", device);
+            return NULL;
+        }
+        /* For TPM, bs is already correct, otherwise need the file child. */
+        if (!strncmp(bs->drv->format_name, "throttle", 8)) {
+            if (!bs->file || !bs->file->bs) {
+                error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
+                          "Device '%s' not found (no file child)", device);
+                return NULL;
+            }
+            bs = bs->file->bs;
+        }
     }
-    BlockDriverState *bs = blk_bs(blk);
+
     if (!bdrv_co_is_inserted(bs)) {
         error_setg(errp, "Device '%s' has no medium", device);
         return NULL;
     }
+
     PVEBackupDevInfo *di = g_new0(PVEBackupDevInfo, 1);
     di->bs = bs;
-    di->device_name = g_strdup(bdrv_get_device_name(bs));
+    /* Need the name of the root node, e.g. drive-scsi0 */
+    di->device_name = g_strdup(bdrv_get_device_or_node_name(root_bs));
 
     if (device_uses_fleecing && device_uses_fleecing(device)) {
         g_autofree gchar *fleecing_devid = g_strconcat(device, "-fleecing", NULL);
+        BlockDriverState *fleecing_bs;
+
         BlockBackend *fleecing_blk = blk_by_name(fleecing_devid);
-        if (!fleecing_blk) {
-            error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
-                      "Device '%s' not found", fleecing_devid);
-            goto fail;
+        if (fleecing_blk) {
+            fleecing_bs = blk_bs(fleecing_blk);
+        } else {
+            /* TODO PVE 10 - fleecing will always be attached without blk */
+            fleecing_bs = bdrv_find_node(fleecing_devid);
+            if (!fleecing_bs) {
+                error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
+                          "Device '%s' not found", fleecing_devid);
+                goto fail;
+            }
         }
-        BlockDriverState *fleecing_bs = blk_bs(fleecing_blk);
+
         if (!bdrv_co_is_inserted(fleecing_bs)) {
             error_setg(errp, "Device '%s' has no medium", fleecing_devid);
             goto fail;
@@ -927,7 +954,7 @@ static GList coroutine_fn GRAPH_RDLOCK *get_device_info(
 
             PVEBackupDevInfo *di = g_new0(PVEBackupDevInfo, 1);
             di->bs = bs;
-            di->device_name = g_strdup(bdrv_get_device_name(bs));
+            di->device_name = g_strdup(bdrv_get_device_or_node_name(bs));
             di_list = g_list_append(di_list, di);
         }
     }
-- 
2.47.2