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projectquota.go
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projectquota.go
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package quota
/*
#include <linux/fs.h>
#include <linux/dqblk_xfs.h>
#include <linux/quota.h>
#include <sys/ioctl.h>
#include <sys/quota.h>
#include <sys/types.h>
#include <fcntl.h>
#include <stdint.h>
#include <stdlib.h>
#include <stdbool.h>
#include <unistd.h>
#ifndef FS_XFLAG_PROJINHERIT
struct fsxattr {
__u32 fsx_xflags;
__u32 fsx_extsize;
__u32 fsx_nextents;
__u32 fsx_projid;
unsigned char fsx_pad[12];
};
#define FS_XFLAG_PROJINHERIT 0x00000200
#endif
#ifndef QIF_DQBLKSIZE_BITS
struct if_dqinfo {
__u64 dqi_bgrace;
__u64 dqi_igrace;
__u32 dqi_flags;
__u32 dqi_valid;
};
struct if_dqblk {
__u64 dqb_bhardlimit;
__u64 dqb_bsoftlimit;
__u64 dqb_curspace;
__u64 dqb_ihardlimit;
__u64 dqb_isoftlimit;
__u64 dqb_curinodes;
__u64 dqb_btime;
__u64 dqb_itime;
__u32 dqb_valid;
};
#define QIF_DQBLKSIZE_BITS 10
#endif
#ifndef FS_IOC_FSGETXATTR
#define FS_IOC_FSGETXATTR _IOR ('X', 31, struct fsxattr)
#endif
#ifndef FS_IOC_FSSETXATTR
#define FS_IOC_FSSETXATTR _IOW ('X', 32, struct fsxattr)
#endif
#ifndef PRJQUOTA
#define PRJQUOTA 2
#endif
int quota_supported(char *dev_path) {
struct if_dqinfo dqinfo;
return quotactl(QCMD(Q_GETINFO, PRJQUOTA), dev_path, 0, (caddr_t)&dqinfo);
}
int64_t quota_get_usage(char *dev_path, uint32_t id) {
struct if_dqblk quota;
if (quotactl(QCMD(Q_GETQUOTA, PRJQUOTA), dev_path, id, (caddr_t)"a) < 0) {
return -1;
}
return quota.dqb_curspace;
}
int quota_set(char *dev_path, uint32_t id, uint64_t hard_bytes) {
struct if_dqblk quota;
fs_disk_quota_t xfsquota;
if (quotactl(QCMD(Q_GETQUOTA, PRJQUOTA), dev_path, id, (caddr_t)"a) < 0) {
return -1;
}
quota.dqb_bhardlimit = hard_bytes;
if (quotactl(QCMD(Q_SETQUOTA, PRJQUOTA), dev_path, id, (caddr_t)"a) < 0) {
xfsquota.d_version = FS_DQUOT_VERSION;
xfsquota.d_id = id;
xfsquota.d_flags = FS_PROJ_QUOTA;
xfsquota.d_fieldmask = FS_DQ_BHARD;
xfsquota.d_blk_hardlimit = hard_bytes * 1024 / 512;
if (quotactl(QCMD(Q_XSETQLIM, PRJQUOTA), dev_path, id, (caddr_t)&xfsquota) < 0) {
return -1;
}
}
return 0;
}
int quota_set_path(char *path, uint32_t id, bool inherit) {
struct fsxattr attr;
int fd;
int ret;
fd = open(path, O_RDONLY | O_CLOEXEC);
if (fd < 0)
return -1;
ret = ioctl(fd, FS_IOC_FSGETXATTR, &attr);
if (ret < 0) {
close(fd);
return -1;
}
if (inherit) {
attr.fsx_xflags |= FS_XFLAG_PROJINHERIT;
}
attr.fsx_projid = id;
ret = ioctl(fd, FS_IOC_FSSETXATTR, &attr);
if (ret < 0) {
close(fd);
return -1;
}
close(fd);
return 0;
}
int32_t quota_get_path(char *path) {
struct fsxattr attr;
int fd;
int ret;
fd = open(path, O_RDONLY | O_CLOEXEC);
if (fd < 0)
return -1;
ret = ioctl(fd, FS_IOC_FSGETXATTR, &attr);
if (ret < 0) {
close(fd);
return -1;
}
close(fd);
return attr.fsx_projid;
}
*/
import "C"
import (
"bufio"
"fmt"
"os"
"path/filepath"
"strings"
"unsafe"
"golang.org/x/sys/unix"
"github.com/canonical/lxd/shared"
)
var errNoDevice = fmt.Errorf("Couldn't find backing device for mountpoint")
func devForPath(path string) (string, error) {
// Get major/minor
var stat unix.Stat_t
err := unix.Lstat(path, &stat)
if err != nil {
return "", err
}
devMajor := unix.Major(uint64(stat.Dev))
devMinor := unix.Minor(uint64(stat.Dev))
// Parse mountinfo for it
mountinfo, err := os.Open("/proc/self/mountinfo")
if err != nil {
return "", err
}
defer func() { _ = mountinfo.Close() }()
scanner := bufio.NewScanner(mountinfo)
for scanner.Scan() {
line := scanner.Text()
tokens := strings.Fields(line)
if len(tokens) < 5 {
continue
}
if tokens[2] == fmt.Sprintf("%d:%d", devMajor, devMinor) {
if shared.PathExists(tokens[len(tokens)-2]) {
return tokens[len(tokens)-2], nil
}
}
}
return "", errNoDevice
}
// Supported check if the given path supports project quotas.
func Supported(path string) (bool, error) {
// Get the backing device
devPath, err := devForPath(path)
if err != nil {
return false, err
}
// Call quotactl through CGo
cDevPath := C.CString(devPath)
defer C.free(unsafe.Pointer(cDevPath))
return C.quota_supported(cDevPath) == 0, nil
}
// GetProject returns the project quota ID for the given path.
func GetProject(path string) (uint32, error) {
// Call ioctl through CGo
cPath := C.CString(path)
defer C.free(unsafe.Pointer(cPath))
id := C.quota_get_path(cPath)
if id < 0 {
return 0, fmt.Errorf("Failed to get project from %q", path)
}
return uint32(id), nil
}
// SetProject recursively sets the project quota ID (and project inherit flag on directories) for the given path.
func SetProject(path string, id uint32) error {
err := filepath.Walk(path, func(filePath string, info os.FileInfo, err error) error {
if err != nil {
return err
}
inherit := false
if info.IsDir() {
inherit = true // Only can set FS_XFLAG_PROJINHERIT on directories.
} else if !info.Mode().IsRegular() {
// Cannot set project ID on non-regular files after file creation. Infact trying to set
// project ID on some file types just blocks forever (such as pipe files).
// So skip them as they don't take up disk space anyway.
return nil
}
// Call ioctl through CGo.
cPath := C.CString(filePath)
defer C.free(unsafe.Pointer(cPath))
if C.quota_set_path(cPath, C.uint32_t(id), C.bool(inherit)) != 0 {
return fmt.Errorf(`Failed to set project ID "%d" on %q (inherit %t)`, id, filePath, inherit)
}
return nil
})
return err
}
// DeleteProject unsets the project id from the path and clears the quota for the project ID.
func DeleteProject(path string, id uint32) error {
// Unset the project from the path.
err := SetProject(path, 0)
if err != nil {
return err
}
// Unset the quota on the project.
err = SetProjectQuota(path, id, 0)
if err != nil {
return err
}
return nil
}
// GetProjectUsage returns the current consumption.
func GetProjectUsage(path string, id uint32) (int64, error) {
// Get the backing device.
devPath, err := devForPath(path)
if err != nil {
return -1, err
}
// Call quotactl through CGo.
cDevPath := C.CString(devPath)
defer C.free(unsafe.Pointer(cDevPath))
size := C.quota_get_usage(cDevPath, C.uint32_t(id))
if size < 0 {
return -1, fmt.Errorf(`Failed to get project consumption for ID "%d" on %q`, id, devPath)
}
return int64(size), nil
}
// SetProjectQuota sets the quota on the project ID.
func SetProjectQuota(path string, id uint32, bytes int64) error {
// Get the backing device
devPath, err := devForPath(path)
if err != nil {
return err
}
// Call quotactl through CGo
cDevPath := C.CString(devPath)
defer C.free(unsafe.Pointer(cDevPath))
if C.quota_set(cDevPath, C.uint32_t(id), C.uint64_t(bytes/1024)) != 0 {
return fmt.Errorf(`Failed to set project quota for ID "%d" on %q`, id, devPath)
}
return nil
}