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From: =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= <marcandre.lureau@redhat.com>
Date: Fri, 8 Jan 2021 07:41:01 -0500
Subject: [PATCH 10/10] qga: update schema for guest-get-disks 'dependents'
 field
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RH-Author: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-id: <20210108074101.290008-11-marcandre.lureau@redhat.com>
Patchwork-id: 100529
O-Subject: [RHEL-8.3.0.z qemu-kvm PATCH 10/10] qga: update schema for guest-get-disks 'dependents' field
Bugzilla: 1913818
RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
RH-Acked-by: Philippe Mathieu-Daudé <philmd@redhat.com>
RH-Acked-by: Stefano Garzarella <sgarzare@redhat.com>

From: Marc-André Lureau <marcandre.lureau@redhat.com>

From: Michael Roth <michael.roth@amd.com>

The recently-added 'guest-get-disk' command returns a list of
GuestDiskInfo entries, which in turn have a 'dependents' field which
lists devices these entries are dependent upon. Thus, 'dependencies'
is a better name for this field. Address this by renaming the field
accordingly.

Additionally, 'dependents' is specified as non-optional, even though
it's not implemented for w32. This is misleading, since it gives users
the impression that a particular disk might not have dependencies,
when in reality that information is simply not known to the guest
agent. Address this by making 'dependents' an optional field, and only
marking it as in-use when the facilities to obtain this information are
available to the guest agent.

Cc: Eric Blake <eblake@redhat.com>
Cc: Tomáš Golembiovský <tgolembi@redhat.com>
Cc: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: Michael Roth <michael.roth@amd.com>

(cherry-picked from commit a8aa94b5f8427cc2924d8cdd417c8014db1c86c0)
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
---
 qga/commands-posix.c | 10 ++++++----
 qga/qapi-schema.json |  8 ++++----
 2 files changed, 10 insertions(+), 8 deletions(-)

diff --git a/qga/commands-posix.c b/qga/commands-posix.c
index 1a9c2cbc3e6..38bc9a229db 100644
--- a/qga/commands-posix.c
+++ b/qga/commands-posix.c
@@ -1226,6 +1226,7 @@ static void get_disk_deps(const char *disk_dir, GuestDiskInfo *disk)
         g_debug("failed to list entries in %s", deps_dir);
         return;
     }
+    disk->has_dependencies = true;
     while ((dep = g_dir_read_name(dp_deps)) != NULL) {
         g_autofree char *dep_dir = NULL;
         strList *dep_item = NULL;
@@ -1238,8 +1239,8 @@ static void get_disk_deps(const char *disk_dir, GuestDiskInfo *disk)
             g_debug("  adding dependent device: %s", dev_name);
             dep_item = g_new0(strList, 1);
             dep_item->value = dev_name;
-            dep_item->next = disk->dependents;
-            disk->dependents = dep_item;
+            dep_item->next = disk->dependencies;
+            disk->dependencies = dep_item;
         }
     }
     g_dir_close(dp_deps);
@@ -1292,8 +1293,9 @@ static GuestDiskInfoList *get_disk_partitions(
         partition->name = dev_name;
         partition->partition = true;
         /* Add parent disk as dependent for easier tracking of hierarchy */
-        partition->dependents = g_new0(strList, 1);
-        partition->dependents->value = g_strdup(disk_dev);
+        partition->dependencies = g_new0(strList, 1);
+        partition->dependencies->value = g_strdup(disk_dev);
+        partition->has_dependencies = true;
 
         item = g_new0(GuestDiskInfoList, 1);
         item->value = partition;
diff --git a/qga/qapi-schema.json b/qga/qapi-schema.json
index 22df375c92f..4222cb92d34 100644
--- a/qga/qapi-schema.json
+++ b/qga/qapi-schema.json
@@ -857,9 +857,9 @@
 #
 # @name: device node (Linux) or device UNC (Windows)
 # @partition: whether this is a partition or disk
-# @dependents: list of dependent devices; e.g. for LVs of the LVM this will
-#              hold the list of PVs, for LUKS encrypted volume this will
-#              contain the disk where the volume is placed.     (Linux)
+# @dependencies: list of device dependencies; e.g. for LVs of the LVM this will
+#                hold the list of PVs, for LUKS encrypted volume this will
+#                contain the disk where the volume is placed.     (Linux)
 # @address: disk address information (only for non-virtual devices)
 # @alias: optional alias assigned to the disk, on Linux this is a name assigned
 #         by device mapper
@@ -867,7 +867,7 @@
 # Since 5.2
 ##
 { 'struct': 'GuestDiskInfo',
-  'data': {'name': 'str', 'partition': 'bool', 'dependents': ['str'],
+  'data': {'name': 'str', 'partition': 'bool', '*dependencies': ['str'],
            '*address': 'GuestDiskAddress', '*alias': 'str'} }
 
 ##
-- 
2.27.0