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Add flag to allow getting all mounts for cgroups subsystems 

Signed-off-by: Mrunal Patel <mrunalp@gmail.com>
This commit is contained in:
Mrunal Patel 2016-09-15 13:24:39 -04:00
parent b1e602e8ba
commit f557996401
3 changed files with 13 additions and 9 deletions
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16
libcontainer/cgroups/utils.go
View File

@ -139,7 +139,7 @@ func (m Mount) GetThisCgroupDir(cgroups map[string]string) (string, error) {
return getControllerPath(m.Subsystems[0], cgroups)
}
func getCgroupMountsHelper(ss map[string]bool, mi io.Reader) ([]Mount, error) {
func getCgroupMountsHelper(ss map[string]bool, mi io.Reader, all bool) ([]Mount, error) {
res := make([]Mount, 0, len(ss))
scanner := bufio.NewScanner(mi)
numFound := 0
@ -166,7 +166,9 @@ func getCgroupMountsHelper(ss map[string]bool, mi io.Reader) ([]Mount, error) {
} else {
m.Subsystems = append(m.Subsystems, opt)
}
numFound++
if !all {
numFound++
}
}
res = append(res, m)
}
@ -176,23 +178,25 @@ func getCgroupMountsHelper(ss map[string]bool, mi io.Reader) ([]Mount, error) {
return res, nil
}
func GetCgroupMounts() ([]Mount, error) {
// GetCgroupMounts returns the mounts for the cgroup subsystems.
// all indicates whether to return just the first instance or all the mounts.
func GetCgroupMounts(all bool) ([]Mount, error) {
f, err := os.Open("/proc/self/mountinfo")
if err != nil {
return nil, err
}
defer f.Close()
all, err := ParseCgroupFile("/proc/self/cgroup")
allSubsystems, err := ParseCgroupFile("/proc/self/cgroup")
if err != nil {
return nil, err
}
allMap := make(map[string]bool)
for s := range all {
for s := range allSubsystems {
allMap[s] = true
}
return getCgroupMountsHelper(allMap, f)
return getCgroupMountsHelper(allMap, f, all)
}
// GetAllSubsystems returns all the cgroup subsystems supported by the kernel

4
libcontainer/cgroups/utils_test.go
View File

@ -134,7 +134,7 @@ func TestGetCgroupMounts(t *testing.T) {
}
for _, td := range testTable {
mi := bytes.NewBufferString(td.mountInfo)
cgMounts, err := getCgroupMountsHelper(td.subsystems, mi)
cgMounts, err := getCgroupMountsHelper(td.subsystems, mi, false)
if err != nil {
t.Fatal(err)
}
@ -187,7 +187,7 @@ func BenchmarkGetCgroupMounts(b *testing.B) {
b.StopTimer()
mi := bytes.NewBufferString(fedoraMountinfo)
b.StartTimer()
if _, err := getCgroupMountsHelper(subsystems, mi); err != nil {
if _, err := getCgroupMountsHelper(subsystems, mi, false); err != nil {
b.Fatal(err)
}
}

2
libcontainer/rootfs_linux.go
View File

@ -270,7 +270,7 @@ func mountToRootfs(m *configs.Mount, rootfs, mountLabel string) error {
}
func getCgroupMounts(m *configs.Mount) ([]*configs.Mount, error) {
mounts, err := cgroups.GetCgroupMounts()
mounts, err := cgroups.GetCgroupMounts(false)
if err != nil {
return nil, err
}