[PATCH v4 1/7] qga: guest-get-fsinfo: add optional 'total-bytes-privileged' field

[Andrey Drobyshev <andrey.drobyshev@virtuozzo.com>]

Since the commit 25b5ff1a86 ("qga: add mountpoint usage info to
GuestFilesystemInfo") we have 2 values reported in guest-get-fsinfo:
used = (f_blocks - f_bfree), total = (f_blocks - f_bfree + f_bavail) as
returned by statvfs(3).  While on Windows guests that's all we can get
with GetDiskFreeSpaceExA(), on POSIX guests we might also be interested in
total file system size, as it's visible for root user.  Let's add an
optional field 'total-bytes-privileged' to GuestFilesystemInfo struct,
which'd only be reported on POSIX and represent f_blocks value as returned
by statvfs(3).

While here, also tweak the docs to reflect better where those values
come from.

Signed-off-by: Andrey Drobyshev <andrey.drobyshev@virtuozzo.com>
---
 qga/commands-posix.c | 2 ++
 qga/commands-win32.c | 1 +
 qga/qapi-schema.json | 7 +++++--
 3 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/qga/commands-posix.c b/qga/commands-posix.c
index 26008db497..7df2d72e9f 100644
--- a/qga/commands-posix.c
+++ b/qga/commands-posix.c
@@ -1569,8 +1569,10 @@ static GuestFilesystemInfo *build_guest_fsinfo(struct FsMount *mount,
         nonroot_total = used + buf.f_bavail;
         fs->used_bytes = used * fr_size;
         fs->total_bytes = nonroot_total * fr_size;
+        fs->total_bytes_privileged = buf.f_blocks * fr_size;
 
         fs->has_total_bytes = true;
+        fs->has_total_bytes_privileged = true;
         fs->has_used_bytes = true;
     }
 
diff --git a/qga/commands-win32.c b/qga/commands-win32.c
index 6242737b00..6fee0e1e6f 100644
--- a/qga/commands-win32.c
+++ b/qga/commands-win32.c
@@ -1143,6 +1143,7 @@ static GuestFilesystemInfo *build_guest_fsinfo(char *guid, Error **errp)
     fs = g_malloc(sizeof(*fs));
     fs->name = g_strdup(guid);
     fs->has_total_bytes = false;
+    fs->has_total_bytes_privileged = false;
     fs->has_used_bytes = false;
     if (len == 0) {
         fs->mountpoint = g_strdup("System Reserved");
diff --git a/qga/qapi-schema.json b/qga/qapi-schema.json
index 9554b566a7..dcc469b268 100644
--- a/qga/qapi-schema.json
+++ b/qga/qapi-schema.json
@@ -1026,7 +1026,10 @@
 #
 # @used-bytes: file system used bytes (since 3.0)
 #
-# @total-bytes: non-root file system total bytes (since 3.0)
+# @total-bytes: filesystem capacity in bytes for unprivileged users (since 3.0)
+#
+# @total-bytes-privileged: filesystem capacity in bytes for privileged users
+#     (since 9.0)
 #
 # @disk: an array of disk hardware information that the volume lies
 #     on, which may be empty if the disk type is not supported
@@ -1036,7 +1039,7 @@
 { 'struct': 'GuestFilesystemInfo',
   'data': {'name': 'str', 'mountpoint': 'str', 'type': 'str',
            '*used-bytes': 'uint64', '*total-bytes': 'uint64',
-           'disk': ['GuestDiskAddress']} }
+           '*total-bytes-privileged': 'uint64', 'disk': ['GuestDiskAddress']} }
 
 ##
 # @guest-get-fsinfo:
-- 
2.39.3