mirror of
https://github.com/moby/moby.git
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339 lines
8.6 KiB
Go
339 lines
8.6 KiB
Go
// +build linux
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//
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// projectquota.go - implements XFS project quota controls
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// for setting quota limits on a newly created directory.
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// It currently supports the legacy XFS specific ioctls.
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//
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// TODO: use generic quota control ioctl FS_IOC_FS{GET,SET}XATTR
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// for both xfs/ext4 for kernel version >= v4.5
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//
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package quota
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/*
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#include <stdlib.h>
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#include <dirent.h>
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#include <linux/fs.h>
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#include <linux/quota.h>
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#include <linux/dqblk_xfs.h>
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#ifndef FS_XFLAG_PROJINHERIT
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struct fsxattr {
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__u32 fsx_xflags;
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__u32 fsx_extsize;
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__u32 fsx_nextents;
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__u32 fsx_projid;
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unsigned char fsx_pad[12];
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};
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#define FS_XFLAG_PROJINHERIT 0x00000200
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#endif
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#ifndef FS_IOC_FSGETXATTR
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#define FS_IOC_FSGETXATTR _IOR ('X', 31, struct fsxattr)
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#endif
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#ifndef FS_IOC_FSSETXATTR
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#define FS_IOC_FSSETXATTR _IOW ('X', 32, struct fsxattr)
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#endif
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#ifndef PRJQUOTA
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#define PRJQUOTA 2
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#endif
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#ifndef XFS_PROJ_QUOTA
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#define XFS_PROJ_QUOTA 2
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#endif
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#ifndef Q_XSETPQLIM
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#define Q_XSETPQLIM QCMD(Q_XSETQLIM, PRJQUOTA)
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#endif
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#ifndef Q_XGETPQUOTA
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#define Q_XGETPQUOTA QCMD(Q_XGETQUOTA, PRJQUOTA)
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#endif
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*/
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import "C"
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import (
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"fmt"
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"io/ioutil"
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"os"
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"path"
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"path/filepath"
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"syscall"
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"unsafe"
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"github.com/Sirupsen/logrus"
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)
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// Quota limit params - currently we only control blocks hard limit
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type Quota struct {
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Size uint64
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}
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// Control - Context to be used by storage driver (e.g. overlay)
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// who wants to apply project quotas to container dirs
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type Control struct {
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backingFsBlockDev string
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nextProjectID uint32
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quotas map[string]uint32
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}
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// NewControl - initialize project quota support.
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// Test to make sure that quota can be set on a test dir and find
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// the first project id to be used for the next container create.
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//
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// Returns nil (and error) if project quota is not supported.
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//
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// First get the project id of the home directory.
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// This test will fail if the backing fs is not xfs.
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//
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// xfs_quota tool can be used to assign a project id to the driver home directory, e.g.:
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// echo 999:/var/lib/docker/overlay2 >> /etc/projects
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// echo docker:999 >> /etc/projid
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// xfs_quota -x -c 'project -s docker' /<xfs mount point>
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//
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// In that case, the home directory project id will be used as a "start offset"
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// and all containers will be assigned larger project ids (e.g. >= 1000).
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// This is a way to prevent xfs_quota management from conflicting with docker.
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//
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// Then try to create a test directory with the next project id and set a quota
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// on it. If that works, continue to scan existing containers to map allocated
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// project ids.
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//
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func NewControl(basePath string) (*Control, error) {
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//
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// Get project id of parent dir as minimal id to be used by driver
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//
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minProjectID, err := getProjectID(basePath)
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if err != nil {
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return nil, err
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}
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minProjectID++
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//
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// create backing filesystem device node
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//
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backingFsBlockDev, err := makeBackingFsDev(basePath)
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if err != nil {
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return nil, err
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}
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//
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// Test if filesystem supports project quotas by trying to set
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// a quota on the first available project id
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//
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quota := Quota{
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Size: 0,
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}
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if err := setProjectQuota(backingFsBlockDev, minProjectID, quota); err != nil {
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return nil, err
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}
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q := Control{
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backingFsBlockDev: backingFsBlockDev,
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nextProjectID: minProjectID + 1,
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quotas: make(map[string]uint32),
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}
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//
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// get first project id to be used for next container
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//
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err = q.findNextProjectID(basePath)
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if err != nil {
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return nil, err
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}
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logrus.Debugf("NewControl(%s): nextProjectID = %d", basePath, q.nextProjectID)
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return &q, nil
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}
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// SetQuota - assign a unique project id to directory and set the quota limits
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// for that project id
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func (q *Control) SetQuota(targetPath string, quota Quota) error {
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projectID, ok := q.quotas[targetPath]
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if !ok {
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projectID = q.nextProjectID
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//
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// assign project id to new container directory
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//
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err := setProjectID(targetPath, projectID)
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if err != nil {
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return err
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}
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q.quotas[targetPath] = projectID
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q.nextProjectID++
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}
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//
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// set the quota limit for the container's project id
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//
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logrus.Debugf("SetQuota(%s, %d): projectID=%d", targetPath, quota.Size, projectID)
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return setProjectQuota(q.backingFsBlockDev, projectID, quota)
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}
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// setProjectQuota - set the quota for project id on xfs block device
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func setProjectQuota(backingFsBlockDev string, projectID uint32, quota Quota) error {
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var d C.fs_disk_quota_t
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d.d_version = C.FS_DQUOT_VERSION
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d.d_id = C.__u32(projectID)
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d.d_flags = C.XFS_PROJ_QUOTA
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d.d_fieldmask = C.FS_DQ_BHARD | C.FS_DQ_BSOFT
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d.d_blk_hardlimit = C.__u64(quota.Size / 512)
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d.d_blk_softlimit = d.d_blk_hardlimit
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var cs = C.CString(backingFsBlockDev)
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defer C.free(unsafe.Pointer(cs))
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_, _, errno := syscall.Syscall6(syscall.SYS_QUOTACTL, C.Q_XSETPQLIM,
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uintptr(unsafe.Pointer(cs)), uintptr(d.d_id),
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uintptr(unsafe.Pointer(&d)), 0, 0)
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if errno != 0 {
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return fmt.Errorf("Failed to set quota limit for projid %d on %s: %v",
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projectID, backingFsBlockDev, errno.Error())
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}
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return nil
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}
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// GetQuota - get the quota limits of a directory that was configured with SetQuota
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func (q *Control) GetQuota(targetPath string, quota *Quota) error {
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projectID, ok := q.quotas[targetPath]
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if !ok {
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return fmt.Errorf("quota not found for path : %s", targetPath)
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}
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//
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// get the quota limit for the container's project id
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//
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var d C.fs_disk_quota_t
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var cs = C.CString(q.backingFsBlockDev)
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defer C.free(unsafe.Pointer(cs))
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_, _, errno := syscall.Syscall6(syscall.SYS_QUOTACTL, C.Q_XGETPQUOTA,
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uintptr(unsafe.Pointer(cs)), uintptr(C.__u32(projectID)),
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uintptr(unsafe.Pointer(&d)), 0, 0)
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if errno != 0 {
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return fmt.Errorf("Failed to get quota limit for projid %d on %s: %v",
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projectID, q.backingFsBlockDev, errno.Error())
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}
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quota.Size = uint64(d.d_blk_hardlimit) * 512
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return nil
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}
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// getProjectID - get the project id of path on xfs
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func getProjectID(targetPath string) (uint32, error) {
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dir, err := openDir(targetPath)
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if err != nil {
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return 0, err
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}
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defer closeDir(dir)
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var fsx C.struct_fsxattr
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_, _, errno := syscall.Syscall(syscall.SYS_IOCTL, getDirFd(dir), C.FS_IOC_FSGETXATTR,
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uintptr(unsafe.Pointer(&fsx)))
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if errno != 0 {
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return 0, fmt.Errorf("Failed to get projid for %s: %v", targetPath, errno.Error())
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}
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return uint32(fsx.fsx_projid), nil
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}
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// setProjectID - set the project id of path on xfs
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func setProjectID(targetPath string, projectID uint32) error {
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dir, err := openDir(targetPath)
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if err != nil {
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return err
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}
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defer closeDir(dir)
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var fsx C.struct_fsxattr
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_, _, errno := syscall.Syscall(syscall.SYS_IOCTL, getDirFd(dir), C.FS_IOC_FSGETXATTR,
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uintptr(unsafe.Pointer(&fsx)))
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if errno != 0 {
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return fmt.Errorf("Failed to get projid for %s: %v", targetPath, errno.Error())
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}
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fsx.fsx_projid = C.__u32(projectID)
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fsx.fsx_xflags |= C.FS_XFLAG_PROJINHERIT
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_, _, errno = syscall.Syscall(syscall.SYS_IOCTL, getDirFd(dir), C.FS_IOC_FSSETXATTR,
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uintptr(unsafe.Pointer(&fsx)))
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if errno != 0 {
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return fmt.Errorf("Failed to set projid for %s: %v", targetPath, errno.Error())
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}
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return nil
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}
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// findNextProjectID - find the next project id to be used for containers
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// by scanning driver home directory to find used project ids
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func (q *Control) findNextProjectID(home string) error {
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files, err := ioutil.ReadDir(home)
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if err != nil {
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return fmt.Errorf("read directory failed : %s", home)
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}
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for _, file := range files {
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if !file.IsDir() {
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continue
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}
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path := filepath.Join(home, file.Name())
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projid, err := getProjectID(path)
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if err != nil {
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return err
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}
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if projid > 0 {
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q.quotas[path] = projid
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}
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if q.nextProjectID <= projid {
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q.nextProjectID = projid + 1
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}
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}
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return nil
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}
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func free(p *C.char) {
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C.free(unsafe.Pointer(p))
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}
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func openDir(path string) (*C.DIR, error) {
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Cpath := C.CString(path)
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defer free(Cpath)
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dir := C.opendir(Cpath)
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if dir == nil {
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return nil, fmt.Errorf("Can't open dir")
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}
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return dir, nil
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}
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func closeDir(dir *C.DIR) {
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if dir != nil {
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C.closedir(dir)
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}
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}
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func getDirFd(dir *C.DIR) uintptr {
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return uintptr(C.dirfd(dir))
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}
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// Get the backing block device of the driver home directory
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// and create a block device node under the home directory
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// to be used by quotactl commands
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func makeBackingFsDev(home string) (string, error) {
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fileinfo, err := os.Stat(home)
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if err != nil {
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return "", err
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}
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backingFsBlockDev := path.Join(home, "backingFsBlockDev")
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// Re-create just in case comeone copied the home directory over to a new device
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syscall.Unlink(backingFsBlockDev)
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stat := fileinfo.Sys().(*syscall.Stat_t)
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if err := syscall.Mknod(backingFsBlockDev, syscall.S_IFBLK|0600, int(stat.Dev)); err != nil {
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return "", fmt.Errorf("Failed to mknod %s: %v", backingFsBlockDev, err)
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}
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return backingFsBlockDev, nil
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}
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