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[Qemu-devel] [PATCH v4] qga: add mountpoint usage to GuestFilesystemInfo
From: |
Chen Hanxiao |
Subject: |
[Qemu-devel] [PATCH v4] qga: add mountpoint usage to GuestFilesystemInfo |
Date: |
Fri, 1 Jun 2018 14:11:21 +0800 |
From: Chen Hanxiao <address@hidden>
This patch adds support for getting the usage of mounted
filesystem.
It's very useful when we try to monitor guest's filesystem.
Cc: Michael Roth <address@hidden>
Cc: Eric Blake <address@hidden>
Signed-off-by: Chen Hanxiao <address@hidden>
---
v2:
add description in qapi-schema and version numbers
v3:
use float for usage to get more precision.
v4:
make usage as a best-effort query and mark it as optional.
qga/commands-posix.c | 17 +++++++++++++++++
qga/qapi-schema.json | 3 ++-
2 files changed, 19 insertions(+), 1 deletion(-)
diff --git a/qga/commands-posix.c b/qga/commands-posix.c
index 0dc219dbcf..4facc76953 100644
--- a/qga/commands-posix.c
+++ b/qga/commands-posix.c
@@ -46,6 +46,7 @@ extern char **environ;
#include <arpa/inet.h>
#include <sys/socket.h>
#include <net/if.h>
+#include <sys/statvfs.h>
#ifdef FIFREEZE
#define CONFIG_FSFREEZE
@@ -1072,6 +1073,9 @@ static GuestFilesystemInfo *build_guest_fsinfo(struct
FsMount *mount,
Error **errp)
{
GuestFilesystemInfo *fs = g_malloc0(sizeof(*fs));
+ struct statvfs buf;
+ unsigned long used, nonroot_total;
+ double usage;
char *devpath = g_strdup_printf("/sys/dev/block/%u:%u",
mount->devmajor, mount->devminor);
@@ -1079,7 +1083,20 @@ static GuestFilesystemInfo *build_guest_fsinfo(struct
FsMount *mount,
fs->type = g_strdup(mount->devtype);
build_guest_fsinfo_for_device(devpath, fs, errp);
+ if (statvfs(fs->mountpoint, &buf)) {
+ fs->has_usage = false;
+ fs->usage = -1;
+ } else {
+ used = buf.f_blocks - buf.f_bfree;
+ nonroot_total = used + buf.f_bavail;
+ usage = (double) used / nonroot_total;
+
+ fs->has_usage = true;
+ fs->usage = usage;
+ }
+
g_free(devpath);
+
return fs;
}
diff --git a/qga/qapi-schema.json b/qga/qapi-schema.json
index 17884c7c70..fcd427e86d 100644
--- a/qga/qapi-schema.json
+++ b/qga/qapi-schema.json
@@ -846,6 +846,7 @@
# @name: disk name
# @mountpoint: mount point path
# @type: file system type string
+# @usage: file system usage, fraction between 0 and 1 (since 3.0)
# @disk: an array of disk hardware information that the volume lies on,
# which may be empty if the disk type is not supported
#
@@ -853,7 +854,7 @@
##
{ 'struct': 'GuestFilesystemInfo',
'data': {'name': 'str', 'mountpoint': 'str', 'type': 'str',
- 'disk': ['GuestDiskAddress']} }
+ '*usage': 'number', 'disk': ['GuestDiskAddress']} }
##
# @guest-get-fsinfo:
--
2.17.0
- [Qemu-devel] [PATCH v4] qga: add mountpoint usage to GuestFilesystemInfo,
Chen Hanxiao <=