[libvirt] [PATCH 2/5] util: Add virCgroupGetBlockDevString
Martin Kletzander
mkletzan at redhat.com
Mon Aug 3 14:50:05 UTC 2015
This function translates device paths to "major:minor " string, and all
virCgroupSetBlkioDevice* functions are modified to use it. It's a
cleanup with no functional change.
Signed-off-by: Martin Kletzander <mkletzan at redhat.com>
---
src/util/vircgroup.c | 180 ++++++++++++++++++++-------------------------------
1 file changed, 70 insertions(+), 110 deletions(-)
diff --git a/src/util/vircgroup.c b/src/util/vircgroup.c
index 0599ba587809..afa85ded9061 100644
--- a/src/util/vircgroup.c
+++ b/src/util/vircgroup.c
@@ -705,6 +705,35 @@ virCgroupDetect(virCgroupPtr group,
}
+static char *
+virCgroupGetBlockDevString(const char *path)
+{
+ char *ret = NULL;
+ struct stat sb;
+
+ if (stat(path, &sb) < 0) {
+ virReportSystemError(errno,
+ _("Path '%s' is not accessible"),
+ path);
+ return NULL;
+ }
+
+ if (!S_ISBLK(sb.st_mode)) {
+ virReportSystemError(EINVAL,
+ _("Path '%s' must be a block device"),
+ path);
+ return NULL;
+ }
+
+ /* Automatically append space after the string since all callers
+ * use it anyway */
+ if (virAsprintf(&ret, "%d:%d ", major(sb.st_rdev), minor(sb.st_rdev)) < 0)
+ return NULL;
+
+ return ret;
+}
+
+
static int
virCgroupSetValueStr(virCgroupPtr group,
int controller,
@@ -1966,7 +1995,6 @@ virCgroupGetBlkioIoDeviceServiced(virCgroupPtr group,
long long *requests_write)
{
char *str1 = NULL, *str2 = NULL, *str3 = NULL, *p1, *p2;
- struct stat sb;
size_t i;
int ret = -1;
@@ -1983,20 +2011,6 @@ virCgroupGetBlkioIoDeviceServiced(virCgroupPtr group,
requests_write
};
- if (stat(path, &sb) < 0) {
- virReportSystemError(errno,
- _("Path '%s' is not accessible"),
- path);
- return -1;
- }
-
- if (!S_ISBLK(sb.st_mode)) {
- virReportSystemError(EINVAL,
- _("Path '%s' must be a block device"),
- path);
- return -1;
- }
-
if (virCgroupGetValueStr(group,
VIR_CGROUP_CONTROLLER_BLKIO,
"blkio.throttle.io_service_bytes", &str1) < 0)
@@ -2007,7 +2021,7 @@ virCgroupGetBlkioIoDeviceServiced(virCgroupPtr group,
"blkio.throttle.io_serviced", &str2) < 0)
goto cleanup;
- if (virAsprintf(&str3, "%d:%d ", major(sb.st_rdev), minor(sb.st_rdev)) < 0)
+ if (!(str3 = virCgroupGetBlockDevString(path)))
goto cleanup;
if (!(p1 = strstr(str1, str3))) {
@@ -2116,33 +2130,22 @@ virCgroupSetBlkioDeviceReadIops(virCgroupPtr group,
const char *path,
unsigned int riops)
{
- char *str;
- struct stat sb;
- int ret;
-
- if (stat(path, &sb) < 0) {
- virReportSystemError(errno,
- _("Path '%s' is not accessible"),
- path);
- return -1;
- }
+ char *str = NULL;
+ char *blkstr = NULL;
+ int ret = -1;
- if (!S_ISBLK(sb.st_mode)) {
- virReportSystemError(EINVAL,
- _("Path '%s' must be a block device"),
- path);
+ if (!(blkstr = virCgroupGetBlockDevString(path)))
return -1;
- }
- if (virAsprintf(&str, "%d:%d %u", major(sb.st_rdev),
- minor(sb.st_rdev), riops) < 0)
- return -1;
+ if (virAsprintf(&str, "%s%u", blkstr, riops) < 0)
+ goto error;
ret = virCgroupSetValueStr(group,
VIR_CGROUP_CONTROLLER_BLKIO,
"blkio.throttle.read_iops_device",
str);
-
+ error:
+ VIR_FREE(blkstr);
VIR_FREE(str);
return ret;
}
@@ -2161,33 +2164,22 @@ virCgroupSetBlkioDeviceWriteIops(virCgroupPtr group,
const char *path,
unsigned int wiops)
{
- char *str;
- struct stat sb;
- int ret;
-
- if (stat(path, &sb) < 0) {
- virReportSystemError(errno,
- _("Path '%s' is not accessible"),
- path);
- return -1;
- }
+ char *str = NULL;
+ char *blkstr = NULL;
+ int ret = -1;
- if (!S_ISBLK(sb.st_mode)) {
- virReportSystemError(EINVAL,
- _("Path '%s' must be a block device"),
- path);
+ if (!(blkstr = virCgroupGetBlockDevString(path)))
return -1;
- }
- if (virAsprintf(&str, "%d:%d %u", major(sb.st_rdev),
- minor(sb.st_rdev), wiops) < 0)
- return -1;
+ if (virAsprintf(&str, "%s%u", blkstr, wiops) < 0)
+ goto error;
ret = virCgroupSetValueStr(group,
VIR_CGROUP_CONTROLLER_BLKIO,
"blkio.throttle.write_iops_device",
str);
-
+ error:
+ VIR_FREE(blkstr);
VIR_FREE(str);
return ret;
}
@@ -2206,33 +2198,22 @@ virCgroupSetBlkioDeviceReadBps(virCgroupPtr group,
const char *path,
unsigned long long rbps)
{
- char *str;
- struct stat sb;
- int ret;
-
- if (stat(path, &sb) < 0) {
- virReportSystemError(errno,
- _("Path '%s' is not accessible"),
- path);
- return -1;
- }
+ char *str = NULL;
+ char *blkstr = NULL;
+ int ret = -1;
- if (!S_ISBLK(sb.st_mode)) {
- virReportSystemError(EINVAL,
- _("Path '%s' must be a block device"),
- path);
+ if (!(blkstr = virCgroupGetBlockDevString(path)))
return -1;
- }
- if (virAsprintf(&str, "%d:%d %llu", major(sb.st_rdev),
- minor(sb.st_rdev), rbps) < 0)
- return -1;
+ if (virAsprintf(&str, "%s%llu", blkstr, rbps) < 0)
+ goto error;
ret = virCgroupSetValueStr(group,
VIR_CGROUP_CONTROLLER_BLKIO,
"blkio.throttle.read_bps_device",
str);
-
+ error:
+ VIR_FREE(blkstr);
VIR_FREE(str);
return ret;
}
@@ -2250,33 +2231,22 @@ virCgroupSetBlkioDeviceWriteBps(virCgroupPtr group,
const char *path,
unsigned long long wbps)
{
- char *str;
- struct stat sb;
- int ret;
-
- if (stat(path, &sb) < 0) {
- virReportSystemError(errno,
- _("Path '%s' is not accessible"),
- path);
- return -1;
- }
+ char *str = NULL;
+ char *blkstr = NULL;
+ int ret = -1;
- if (!S_ISBLK(sb.st_mode)) {
- virReportSystemError(EINVAL,
- _("Path '%s' must be a block device"),
- path);
+ if (!(blkstr = virCgroupGetBlockDevString(path)))
return -1;
- }
- if (virAsprintf(&str, "%d:%d %llu", major(sb.st_rdev),
- minor(sb.st_rdev), wbps) < 0)
- return -1;
+ if (virAsprintf(&str, "%s%llu", blkstr, wbps) < 0)
+ goto error;
ret = virCgroupSetValueStr(group,
VIR_CGROUP_CONTROLLER_BLKIO,
"blkio.throttle.write_bps_device",
str);
-
+ error:
+ VIR_FREE(blkstr);
VIR_FREE(str);
return ret;
}
@@ -2299,32 +2269,22 @@ virCgroupSetBlkioDeviceWeight(virCgroupPtr group,
const char *path,
unsigned int weight)
{
- char *str;
- struct stat sb;
- int ret;
+ char *str = NULL;
+ char *blkstr = NULL;
+ int ret = -1;
- if (stat(path, &sb) < 0) {
- virReportSystemError(errno,
- _("Path '%s' is not accessible"),
- path);
+ if (!(blkstr = virCgroupGetBlockDevString(path)))
return -1;
- }
- if (!S_ISBLK(sb.st_mode)) {
- virReportSystemError(EINVAL,
- _("Path '%s' must be a block device"),
- path);
- return -1;
- }
-
- if (virAsprintf(&str, "%d:%d %d", major(sb.st_rdev), minor(sb.st_rdev),
- weight) < 0)
- return -1;
+ if (virAsprintf(&str, "%s%d", blkstr, weight) < 0)
+ goto error;
ret = virCgroupSetValueStr(group,
VIR_CGROUP_CONTROLLER_BLKIO,
"blkio.weight_device",
str);
+ error:
+ VIR_FREE(blkstr);
VIR_FREE(str);
return ret;
}
--
2.5.0
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