[Qemu-devel] [PATCH 08/10] qga: added mountpoint and filesystem type for single volume

[Denis V. Lunev]

From: Olga Krishtal <address@hidden>

We should use GetVolumeXXX api to work with volumes. This will help us to
resolve the situation with volumes without drive letter, i.e. when the
volume is mounted as a folder. Such volume is called mounted folder.
This volume is a regular mounted volume from all other points of view.
The information about non mounted volume is reported as System Reserved.
This volume is not mounted and thus it is not writable.

GuestDiskAddressList API is not used because operations are performed with
volumes but no with disks. This means that spanned disk will
be counted and handled as a single volume. It is worth mentioning
that the information about every disk in the volume can be queried
via IOCTL_VOLUME_GET_VOLUME_DISK_EXTENTS.

Signed-off-by: Olga Krishtal <address@hidden>
Signed-off-by: Denis V. Lunev <address@hidden>
CC: Eric Blake <address@hidden>
CC: Michael Roth <address@hidden>
---
 qga/commands-win32.c | 54 +++++++++++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 51 insertions(+), 3 deletions(-)

diff --git a/qga/commands-win32.c b/qga/commands-win32.c
index f484adc..7acb258 100644
--- a/qga/commands-win32.c
+++ b/qga/commands-win32.c
@@ -771,7 +771,51 @@ done:
 
 static GuestFilesystemInfo *build_guest_fsinfo(char *guid, Error **errp)
 {
-   return NULL;
+    DWORD info_size;
+    char mnt, *mnt_point;
+    char fs_name[32];
+    char vol_info[MAX_PATH+1];
+    bool res;
+    size_t len;
+    DWORD err_code;
+    GuestFilesystemInfo *fs;
+
+    GetVolumePathNamesForVolumeName(guid, (LPCH)&mnt, 0,
+                                    &info_size);
+    if (GetLastError() != ERROR_MORE_DATA) {
+        error_setg_win32(errp, GetLastError(), "failed to get volume name");
+        return NULL;
+    }
+
+    mnt_point = g_malloc0(sizeof(TCHAR)*info_size*2);
+    res = GetVolumePathNamesForVolumeName(guid, mnt_point, sizeof(mnt_point),
+                                    &info_size);
+    err_code = GetLastError();
+    if (!res && err_code != ERROR_SUCCESS && err_code != ERROR_MORE_DATA) {
+        error_setg_win32(errp, GetLastError(), "failed ro get volume name");
+        g_free(mnt_point);
+        return NULL;
+    }
+    len = strlen(mnt_point);
+    mnt_point[len] = '\\';
+    if (!GetVolumeInformation(mnt_point, vol_info, sizeof(vol_info), NULL, 
NULL,
+                              NULL, (LPSTR)&fs_name, sizeof(fs_name))) {
+        if (GetLastError() != ERROR_NOT_READY) {
+            error_setg_win32(errp, GetLastError(), "failed to get volume 
info");
+        }
+        g_free(mnt_point);
+        return NULL;
+    }
+
+    fs_name[sizeof(fs_name) - 1] = 0;
+    fs = g_malloc(sizeof(*fs));
+    fs->name = g_strdup(guid);
+    fs->mountpoint = g_strndup(mnt_point, len);
+    fs->type = g_strdup(fs_name);
+    fs->disk = NULL;
+    g_free(mnt_point);
+    return fs;
+
 }
 
 GuestFilesystemInfoList *qmp_guest_get_fsinfo(Error **errp)
@@ -789,8 +833,12 @@ GuestFilesystemInfoList *qmp_guest_get_fsinfo(Error **errp)
     do {
         new = g_malloc(sizeof(*ret));
         new->value = build_guest_fsinfo(guid, errp);
-        new->next = ret;
-        ret = new;
+        if (new->value != NULL) {
+            new->next = ret;
+            ret = new;
+        } else {
+            g_free(new);
+        }
         res = FindNextVolume(vol_h, guid, sizeof(guid));
     } while (GetLastError() != ERROR_NO_MORE_FILES && res);
 
-- 
1.9.1