metropolis: unify utility packages
One last sweeping rename / reshuffle.
We get rid of //metropolis/node/common and //golibs, unifying them into
a single //metropolis/pkg meta-package.
This is to be documented somwhere properly, but here's the new logic
behind selecting where to place a new library package:
- if it's specific to k8s-on-metropolis, put it in
//metropolis/node/kubernetes/*. This is a self-contained tree that
other paths cannot import from.
- if it's a big new subsystem of the metropolis core, put it in
//metropolis/node/core. This can be imported by anything in
//m/n (eg the Kubernetes code at //m/n/kubernetes
- otherwise, treat it as generic library that's part of the metropolis
project, and put it in //metropolis/pkg. This can be imported by
anything within //metropolis.
This will be followed up by a diff that updates visibility rules.
Test Plan: Pure refactor, CI only.
X-Origin-Diff: phab/D683
GitOrigin-RevId: 883e7f09a7d22d64e966d07bbe839454ed081c79
diff --git a/metropolis/pkg/fsquota/quotactl/BUILD.bazel b/metropolis/pkg/fsquota/quotactl/BUILD.bazel
new file mode 100644
index 0000000..406c784
--- /dev/null
+++ b/metropolis/pkg/fsquota/quotactl/BUILD.bazel
@@ -0,0 +1,9 @@
+load("@io_bazel_rules_go//go:def.bzl", "go_library")
+
+go_library(
+ name = "go_default_library",
+ srcs = ["quotactl.go"],
+ importpath = "git.monogon.dev/source/nexantic.git/metropolis/pkg/fsquota/quotactl",
+ visibility = ["//visibility:public"],
+ deps = ["@org_golang_x_sys//unix:go_default_library"],
+)
diff --git a/metropolis/pkg/fsquota/quotactl/quotactl.go b/metropolis/pkg/fsquota/quotactl/quotactl.go
new file mode 100644
index 0000000..5ed77d7
--- /dev/null
+++ b/metropolis/pkg/fsquota/quotactl/quotactl.go
@@ -0,0 +1,233 @@
+// Copyright 2020 The Monogon Project Authors.
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Package quotactl implements a low-level wrapper around the modern portion of Linux's
+// quotactl() syscall. See the fsquota package for a nicer interface to the most common part
+// of this API.
+package quotactl
+
+import (
+ "fmt"
+ "unsafe"
+
+ "golang.org/x/sys/unix"
+)
+
+type QuotaType uint
+
+const (
+ QuotaTypeUser QuotaType = iota
+ QuotaTypeGroup
+ QuotaTypeProject
+)
+
+const (
+ Q_SYNC uint = ((0x800001 + iota) << 8)
+ Q_QUOTAON
+ Q_QUOTAOFF
+ Q_GETFMT
+ Q_GETINFO
+ Q_SETINFO
+ Q_GETQUOTA
+ Q_SETQUOTA
+ Q_GETNEXTQUOTA
+)
+
+const (
+ FlagBLimitsValid = 1 << iota
+ FlagSpaceValid
+ FlagILimitsValid
+ FlagInodesValid
+ FlagBTimeValid
+ FlagITimeValid
+)
+
+type DQInfo struct {
+ Bgrace uint64
+ Igrace uint64
+ Flags uint32
+ Valid uint32
+}
+
+type Quota struct {
+ BHardLimit uint64 // Both Byte limits are prescaled by 1024 (so are in KiB), but CurSpace is in B
+ BSoftLimit uint64
+ CurSpace uint64
+ IHardLimit uint64
+ ISoftLimit uint64
+ CurInodes uint64
+ BTime uint64
+ ITime uint64
+ Valid uint32
+}
+
+type NextDQBlk struct {
+ HardLimitBytes uint64
+ SoftLimitBytes uint64
+ CurrentBytes uint64
+ HardLimitInodes uint64
+ SoftLimitInodes uint64
+ CurrentInodes uint64
+ BTime uint64
+ ITime uint64
+ Valid uint32
+ ID uint32
+}
+
+type QuotaFormat uint32
+
+// Collected from quota_format_type structs
+const (
+ // QuotaFormatNone is a special case where all quota information is
+ // stored inside filesystem metadata and thus requires no quotaFilePath.
+ QuotaFormatNone QuotaFormat = 0
+ QuotaFormatVFSOld QuotaFormat = 1
+ QuotaFormatVFSV0 QuotaFormat = 2
+ QuotaFormatOCFS2 QuotaFormat = 3
+ QuotaFormatVFSV1 QuotaFormat = 4
+)
+
+// QuotaOn turns quota accounting and enforcement on
+func QuotaOn(device string, qtype QuotaType, quotaFormat QuotaFormat, quotaFilePath string) error {
+ devArg, err := unix.BytePtrFromString(device)
+ if err != nil {
+ return err
+ }
+ pathArg, err := unix.BytePtrFromString(quotaFilePath)
+ if err != nil {
+ return err
+ }
+ _, _, err = unix.Syscall6(unix.SYS_QUOTACTL, uintptr(Q_QUOTAON|uint(qtype)), uintptr(unsafe.Pointer(devArg)), uintptr(quotaFormat), uintptr(unsafe.Pointer(pathArg)), 0, 0)
+ if err != unix.Errno(0) {
+ return err
+ }
+ return nil
+}
+
+// QuotaOff turns quotas off
+func QuotaOff(device string, qtype QuotaType) error {
+ devArg, err := unix.BytePtrFromString(device)
+ if err != nil {
+ return err
+ }
+ _, _, err = unix.Syscall6(unix.SYS_QUOTACTL, uintptr(Q_QUOTAOFF|uint(qtype)), uintptr(unsafe.Pointer(devArg)), 0, 0, 0, 0)
+ if err != unix.Errno(0) {
+ return err
+ }
+ return nil
+}
+
+// GetFmt gets the quota format used on given filesystem
+func GetFmt(device string, qtype QuotaType) (uint32, error) {
+ var fmt uint32
+ devArg, err := unix.BytePtrFromString(device)
+ if err != nil {
+ return 0, err
+ }
+ _, _, err = unix.Syscall6(unix.SYS_QUOTACTL, uintptr(Q_GETFMT|uint(qtype)), uintptr(unsafe.Pointer(devArg)), 0, uintptr(unsafe.Pointer(&fmt)), 0, 0)
+ if err != unix.Errno(0) {
+ return 0, err
+ }
+ return fmt, nil
+}
+
+// GetInfo gets information about quota files
+func GetInfo(device string, qtype QuotaType) (*DQInfo, error) {
+ var info DQInfo
+ devArg, err := unix.BytePtrFromString(device)
+ if err != nil {
+ return nil, err
+ }
+ _, _, err = unix.Syscall6(unix.SYS_QUOTACTL, uintptr(Q_GETINFO|uint(qtype)), uintptr(unsafe.Pointer(devArg)), 0, uintptr(unsafe.Pointer(&info)), 0, 0)
+ if err != unix.Errno(0) {
+ return nil, err
+ }
+ return &info, nil
+}
+
+// SetInfo sets information about quota files
+func SetInfo(device string, qtype QuotaType, info *DQInfo) error {
+ devArg, err := unix.BytePtrFromString(device)
+ if err != nil {
+ return err
+ }
+ _, _, err = unix.Syscall6(unix.SYS_QUOTACTL, uintptr(Q_SETINFO|uint(qtype)), uintptr(unsafe.Pointer(devArg)), 0, uintptr(unsafe.Pointer(info)), 0, 0)
+ if err != unix.Errno(0) {
+ return err
+ }
+ return nil
+}
+
+// GetQuota gets user quota structure
+func GetQuota(device string, qtype QuotaType, id uint32) (*Quota, error) {
+ var info Quota
+ devArg, err := unix.BytePtrFromString(device)
+ if err != nil {
+ return nil, err
+ }
+ _, _, err = unix.Syscall6(unix.SYS_QUOTACTL, uintptr(Q_GETQUOTA|uint(qtype)), uintptr(unsafe.Pointer(devArg)), uintptr(id), uintptr(unsafe.Pointer(&info)), 0, 0)
+ if err != unix.Errno(0) {
+ return nil, err
+ }
+ return &info, nil
+}
+
+// GetNextQuota gets disk limits and usage > ID
+func GetNextQuota(device string, qtype QuotaType, id uint32) (*NextDQBlk, error) {
+ var info NextDQBlk
+ devArg, err := unix.BytePtrFromString(device)
+ if err != nil {
+ return nil, err
+ }
+ _, _, err = unix.Syscall6(unix.SYS_QUOTACTL, uintptr(Q_GETNEXTQUOTA|uint(qtype)), uintptr(unsafe.Pointer(devArg)), uintptr(id), uintptr(unsafe.Pointer(&info)), 0, 0)
+ if err != unix.Errno(0) {
+ return nil, err
+ }
+ return &info, nil
+}
+
+// SetQuota sets the given quota
+func SetQuota(device string, qtype QuotaType, id uint32, quota *Quota) error {
+ devArg, err := unix.BytePtrFromString(device)
+ if err != nil {
+ return err
+ }
+ _, _, err = unix.Syscall6(unix.SYS_QUOTACTL, uintptr(Q_SETQUOTA|uint(qtype)), uintptr(unsafe.Pointer(devArg)), uintptr(id), uintptr(unsafe.Pointer(quota)), 0, 0)
+ if err != unix.Errno(0) {
+ return fmt.Errorf("failed to set quota: %w", err)
+ }
+ return nil
+}
+
+// Sync syncs disk copy of filesystems quotas. If device is empty it syncs all filesystems.
+func Sync(device string) error {
+ if device != "" {
+ devArg, err := unix.BytePtrFromString(device)
+ if err != nil {
+ return err
+ }
+ _, _, err = unix.Syscall6(unix.SYS_QUOTACTL, uintptr(Q_SYNC), uintptr(unsafe.Pointer(devArg)), 0, 0, 0, 0)
+ if err != unix.Errno(0) {
+ return err
+ }
+ } else {
+ _, _, err := unix.Syscall6(unix.SYS_QUOTACTL, uintptr(Q_SYNC), 0, 0, 0, 0, 0)
+ if err != unix.Errno(0) {
+ return err
+ }
+ }
+ return nil
+}