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Persist the quota size for btrfs so that daemon restart keeps quota

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This commit is an extension of fix for 29325 based on the review comment.
In this commit, the quota size for btrfs is kept in `/var/lib/docker/btrfs/quotas`
so that a daemon restart keeps quota.

Signed-off-by: Yong Tang <yong.tang.github@outlook.com>
This commit is contained in:
Yong Tang 2017-05-24 18:00:02 -07:00
parent e907c6418a
commit 16328cc207
1 changed files with 37 additions and 0 deletions
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37
daemon/graphdriver/btrfs/btrfs.go
View file

@ -16,10 +16,12 @@ import "C"
import (
"fmt"
"io/ioutil"
"math"
"os"
"path"
"path/filepath"
"strconv"
"strings"
"sync"
"syscall"
@ -477,6 +479,14 @@ func (d *Driver) subvolumesDirID(id string) string {
return path.Join(d.subvolumesDir(), id)
}
func (d *Driver) quotasDir() string {
return path.Join(d.home, "quotas")
}
func (d *Driver) quotasDirID(id string) string {
return path.Join(d.quotasDir(), id)
}
// CreateReadWrite creates a layer that is writable for use as a container
// file system.
func (d *Driver) CreateReadWrite(id, parent string, opts *graphdriver.CreateOpts) error {
@ -485,6 +495,7 @@ func (d *Driver) CreateReadWrite(id, parent string, opts *graphdriver.CreateOpts
// Create the filesystem with given id.
func (d *Driver) Create(id, parent string, opts *graphdriver.CreateOpts) error {
quotas := path.Join(d.home, "quotas")
subvolumes := path.Join(d.home, "subvolumes")
rootUID, rootGID, err := idtools.GetRootUIDGID(d.uidMaps, d.gidMaps)
if err != nil {
@ -521,9 +532,16 @@ func (d *Driver) Create(id, parent string, opts *graphdriver.CreateOpts) error {
if err := d.parseStorageOpt(storageOpt, driver); err != nil {
return err
}
if err := d.setStorageSize(path.Join(subvolumes, id), driver); err != nil {
return err
}
if err := idtools.MkdirAllAs(quotas, 0700, rootUID, rootGID); err != nil {
return err
}
if err := ioutil.WriteFile(path.Join(quotas, id), []byte(fmt.Sprint(driver.options.size)), 0644); err != nil {
return err
}
}
// if we have a remapped root (user namespaces enabled), change the created snapshot
@ -588,6 +606,14 @@ func (d *Driver) Remove(id string) error {
if _, err := os.Stat(dir); err != nil {
return err
}
quotasDir := d.quotasDirID(id)
if _, err := os.Stat(quotasDir); err == nil {
if err := os.Remove(quotasDir); err != nil {
return err
}
} else if !os.IsNotExist(err) {
return err
}
// Call updateQuotaStatus() to invoke status update
d.updateQuotaStatus()
@ -616,6 +642,17 @@ func (d *Driver) Get(id, mountLabel string) (string, error) {
return "", fmt.Errorf("%s: not a directory", dir)
}
if quota, err := ioutil.ReadFile(d.quotasDirID(id)); err == nil {
if size, err := strconv.ParseUint(string(quota), 10, 64); err == nil && size >= d.options.minSpace {
if err := d.subvolEnableQuota(); err != nil {
return "", err
}
if err := subvolLimitQgroup(dir, size); err != nil {
return "", err
}
}
}
return dir, nil
}