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Re: [PATCH v6 03/10] block: add ability to specify list of blockdevs dur

From: Eric Blake
Subject: Re: [PATCH v6 03/10] block: add ability to specify list of blockdevs during snapshot
Date: Mon, 19 Oct 2020 16:23:39 -0500
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.3.1

On 10/8/20 10:49 AM, Daniel P. Berrangé wrote:
When running snapshot operations, there are various rules for which
blockdevs are included/excluded. While this provides reasonable default
behaviour, there are scenarios that are not well handled by the default
logic. Some of the conditions do not have a single correct answer.

Thus there needs to be a way for the mgmt app to provide an explicit
list of blockdevs to perform snapshots across. This can be achieved
by passing a list of node names that should be used.

Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>

+static int bdrv_all_get_snapshot_devices(bool has_devices, strList *devices,
+                                         GList **all_bdrvs,
+                                         Error **errp)
+    g_autoptr(GList) bdrvs = NULL;
+    if (has_devices) {
+        if (!devices) {
+            error_setg(errp, "At least one device is required for snapshot");
+            return -1;
+        }
+        while (devices) {
+            BlockDriverState *bs = bdrv_find_node(devices->value);
+            if (!bs) {
+                error_setg(errp, "No block device node '%s'", devices->value);
+                return -1;
+            }
+            bdrvs = g_list_append(bdrvs, bs);
+            devices = devices->next;
+        }

Do we care if the user passes the same device more than once in their list? (If so, a hash table might be better than g_list)

Otherwise, looks good to me.
Reviewed-by: Eric Blake <eblake@redhat.com>

Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3226
Virtualization:  qemu.org | libvirt.org

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