565 lines
16 KiB
Go
565 lines
16 KiB
Go
// Copyright 2019 The gVisor Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// Package tmpfs provides a filesystem implementation that behaves like tmpfs:
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// the Dentry tree is the sole source of truth for the state of the filesystem.
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//
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// Lock order:
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//
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// filesystem.mu
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// inode.mu
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// regularFileFD.offMu
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// regularFile.mapsMu
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// regularFile.dataMu
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package tmpfs
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import (
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"fmt"
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"math"
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"sync/atomic"
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"gvisor.dev/gvisor/pkg/abi/linux"
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"gvisor.dev/gvisor/pkg/context"
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fslock "gvisor.dev/gvisor/pkg/sentry/fs/lock"
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"gvisor.dev/gvisor/pkg/sentry/kernel/auth"
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"gvisor.dev/gvisor/pkg/sentry/kernel/time"
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"gvisor.dev/gvisor/pkg/sentry/pgalloc"
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"gvisor.dev/gvisor/pkg/sentry/vfs"
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"gvisor.dev/gvisor/pkg/sentry/vfs/lock"
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"gvisor.dev/gvisor/pkg/sync"
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"gvisor.dev/gvisor/pkg/syserror"
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)
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// Name is the default filesystem name.
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const Name = "tmpfs"
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// FilesystemType implements vfs.FilesystemType.
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type FilesystemType struct{}
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// filesystem implements vfs.FilesystemImpl.
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type filesystem struct {
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vfsfs vfs.Filesystem
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// memFile is used to allocate pages to for regular files.
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memFile *pgalloc.MemoryFile
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// clock is a realtime clock used to set timestamps in file operations.
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clock time.Clock
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// mu serializes changes to the Dentry tree.
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mu sync.RWMutex
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nextInoMinusOne uint64 // accessed using atomic memory operations
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}
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// Name implements vfs.FilesystemType.Name.
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func (FilesystemType) Name() string {
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return Name
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}
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// FilesystemOpts is used to pass configuration data to tmpfs.
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type FilesystemOpts struct {
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// RootFileType is the FileType of the filesystem root. Valid values
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// are: S_IFDIR, S_IFREG, and S_IFLNK. Defaults to S_IFDIR.
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RootFileType uint16
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// RootSymlinkTarget is the target of the root symlink. Only valid if
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// RootFileType == S_IFLNK.
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RootSymlinkTarget string
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// FilesystemType allows setting a different FilesystemType for this
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// tmpfs filesystem. This allows tmpfs to "impersonate" other
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// filesystems, like ramdiskfs and cgroupfs.
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FilesystemType vfs.FilesystemType
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}
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// GetFilesystem implements vfs.FilesystemType.GetFilesystem.
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func (fstype FilesystemType) GetFilesystem(ctx context.Context, vfsObj *vfs.VirtualFilesystem, creds *auth.Credentials, source string, opts vfs.GetFilesystemOptions) (*vfs.Filesystem, *vfs.Dentry, error) {
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memFileProvider := pgalloc.MemoryFileProviderFromContext(ctx)
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if memFileProvider == nil {
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panic("MemoryFileProviderFromContext returned nil")
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}
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clock := time.RealtimeClockFromContext(ctx)
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fs := filesystem{
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memFile: memFileProvider.MemoryFile(),
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clock: clock,
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}
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rootFileType := uint16(linux.S_IFDIR)
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newFSType := vfs.FilesystemType(&fstype)
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tmpfsOpts, ok := opts.InternalData.(FilesystemOpts)
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if ok {
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if tmpfsOpts.RootFileType != 0 {
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rootFileType = tmpfsOpts.RootFileType
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}
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if tmpfsOpts.FilesystemType != nil {
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newFSType = tmpfsOpts.FilesystemType
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}
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}
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fs.vfsfs.Init(vfsObj, newFSType, &fs)
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var root *inode
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switch rootFileType {
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case linux.S_IFREG:
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root = fs.newRegularFile(creds, 0777)
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case linux.S_IFLNK:
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root = fs.newSymlink(creds, tmpfsOpts.RootSymlinkTarget)
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case linux.S_IFDIR:
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root = fs.newDirectory(creds, 01777)
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default:
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return nil, nil, fmt.Errorf("invalid tmpfs root file type: %#o", rootFileType)
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}
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return &fs.vfsfs, &fs.newDentry(root).vfsd, nil
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}
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// Release implements vfs.FilesystemImpl.Release.
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func (fs *filesystem) Release() {
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}
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// dentry implements vfs.DentryImpl.
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type dentry struct {
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vfsd vfs.Dentry
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// inode is the inode represented by this dentry. Multiple Dentries may
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// share a single non-directory inode (with hard links). inode is
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// immutable.
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inode *inode
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// tmpfs doesn't count references on dentries; because the dentry tree is
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// the sole source of truth, it is by definition always consistent with the
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// state of the filesystem. However, it does count references on inodes,
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// because inode resources are released when all references are dropped.
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// (tmpfs doesn't really have resources to release, but we implement
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// reference counting because tmpfs regular files will.)
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// dentryEntry (ugh) links dentries into their parent directory.childList.
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dentryEntry
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}
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func (fs *filesystem) newDentry(inode *inode) *dentry {
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d := &dentry{
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inode: inode,
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}
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d.vfsd.Init(d)
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return d
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}
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// IncRef implements vfs.DentryImpl.IncRef.
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func (d *dentry) IncRef() {
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d.inode.incRef()
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}
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// TryIncRef implements vfs.DentryImpl.TryIncRef.
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func (d *dentry) TryIncRef() bool {
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return d.inode.tryIncRef()
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}
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// DecRef implements vfs.DentryImpl.DecRef.
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func (d *dentry) DecRef() {
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d.inode.decRef()
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}
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// inode represents a filesystem object.
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type inode struct {
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// clock is a realtime clock used to set timestamps in file operations.
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clock time.Clock
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// refs is a reference count. refs is accessed using atomic memory
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// operations.
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//
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// A reference is held on all inodes that are reachable in the filesystem
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// tree. For non-directories (which may have multiple hard links), this
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// means that a reference is dropped when nlink reaches 0. For directories,
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// nlink never reaches 0 due to the "." entry; instead,
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// filesystem.RmdirAt() drops the reference.
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refs int64
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// Inode metadata. Writing multiple fields atomically requires holding
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// mu, othewise atomic operations can be used.
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mu sync.Mutex
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mode uint32 // file type and mode
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nlink uint32 // protected by filesystem.mu instead of inode.mu
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uid uint32 // auth.KUID, but stored as raw uint32 for sync/atomic
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gid uint32 // auth.KGID, but ...
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ino uint64 // immutable
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// Linux's tmpfs has no concept of btime.
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atime int64 // nanoseconds
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ctime int64 // nanoseconds
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mtime int64 // nanoseconds
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// Only meaningful for device special files.
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rdevMajor uint32
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rdevMinor uint32
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// Advisory file locks, which lock at the inode level.
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locks lock.FileLocks
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impl interface{} // immutable
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}
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const maxLinks = math.MaxUint32
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func (i *inode) init(impl interface{}, fs *filesystem, creds *auth.Credentials, mode linux.FileMode) {
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if mode.FileType() == 0 {
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panic("file type is required in FileMode")
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}
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i.clock = fs.clock
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i.refs = 1
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i.mode = uint32(mode)
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i.uid = uint32(creds.EffectiveKUID)
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i.gid = uint32(creds.EffectiveKGID)
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i.ino = atomic.AddUint64(&fs.nextInoMinusOne, 1)
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// Tmpfs creation sets atime, ctime, and mtime to current time.
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now := i.clock.Now().Nanoseconds()
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i.atime = now
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i.ctime = now
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i.mtime = now
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// i.nlink initialized by caller
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i.impl = impl
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}
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// incLinksLocked increments i's link count.
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//
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// Preconditions: filesystem.mu must be locked for writing. i.nlink != 0.
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// i.nlink < maxLinks.
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func (i *inode) incLinksLocked() {
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if i.nlink == 0 {
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panic("tmpfs.inode.incLinksLocked() called with no existing links")
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}
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if i.nlink == maxLinks {
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panic("memfs.inode.incLinksLocked() called with maximum link count")
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}
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atomic.AddUint32(&i.nlink, 1)
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}
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// decLinksLocked decrements i's link count.
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//
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// Preconditions: filesystem.mu must be locked for writing. i.nlink != 0.
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func (i *inode) decLinksLocked() {
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if i.nlink == 0 {
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panic("tmpfs.inode.decLinksLocked() called with no existing links")
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}
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atomic.AddUint32(&i.nlink, ^uint32(0))
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}
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func (i *inode) incRef() {
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if atomic.AddInt64(&i.refs, 1) <= 1 {
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panic("tmpfs.inode.incRef() called without holding a reference")
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}
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}
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func (i *inode) tryIncRef() bool {
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for {
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refs := atomic.LoadInt64(&i.refs)
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if refs == 0 {
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return false
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}
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if atomic.CompareAndSwapInt64(&i.refs, refs, refs+1) {
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return true
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}
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}
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}
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func (i *inode) decRef() {
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if refs := atomic.AddInt64(&i.refs, -1); refs == 0 {
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if regFile, ok := i.impl.(*regularFile); ok {
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// Hold inode.mu and regFile.dataMu while mutating
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// size.
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i.mu.Lock()
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regFile.dataMu.Lock()
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regFile.data.DropAll(regFile.memFile)
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atomic.StoreUint64(®File.size, 0)
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regFile.dataMu.Unlock()
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i.mu.Unlock()
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}
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} else if refs < 0 {
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panic("tmpfs.inode.decRef() called without holding a reference")
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}
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}
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func (i *inode) checkPermissions(creds *auth.Credentials, ats vfs.AccessTypes) error {
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mode := linux.FileMode(atomic.LoadUint32(&i.mode))
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return vfs.GenericCheckPermissions(creds, ats, mode, auth.KUID(atomic.LoadUint32(&i.uid)), auth.KGID(atomic.LoadUint32(&i.gid)))
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}
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// Go won't inline this function, and returning linux.Statx (which is quite
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// big) means spending a lot of time in runtime.duffcopy(), so instead it's an
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// output parameter.
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//
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// Note that Linux does not guarantee to return consistent data (in the case of
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// a concurrent modification), so we do not require holding inode.mu.
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func (i *inode) statTo(stat *linux.Statx) {
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stat.Mask = linux.STATX_TYPE | linux.STATX_MODE | linux.STATX_NLINK |
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linux.STATX_UID | linux.STATX_GID | linux.STATX_INO | linux.STATX_ATIME |
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linux.STATX_BTIME | linux.STATX_CTIME | linux.STATX_MTIME
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stat.Blksize = 1 // usermem.PageSize in tmpfs
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stat.Nlink = atomic.LoadUint32(&i.nlink)
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stat.UID = atomic.LoadUint32(&i.uid)
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stat.GID = atomic.LoadUint32(&i.gid)
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stat.Mode = uint16(atomic.LoadUint32(&i.mode))
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stat.Ino = i.ino
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// Linux's tmpfs has no concept of btime, so zero-value is returned.
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stat.Atime = linux.NsecToStatxTimestamp(i.atime)
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stat.Ctime = linux.NsecToStatxTimestamp(i.ctime)
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stat.Mtime = linux.NsecToStatxTimestamp(i.mtime)
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// TODO(gvisor.dev/issue/1197): Device number.
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switch impl := i.impl.(type) {
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case *regularFile:
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stat.Mask |= linux.STATX_SIZE | linux.STATX_BLOCKS
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stat.Size = uint64(atomic.LoadUint64(&impl.size))
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// In tmpfs, this will be FileRangeSet.Span() / 512 (but also cached in
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// a uint64 accessed using atomic memory operations to avoid taking
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// locks).
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stat.Blocks = allocatedBlocksForSize(stat.Size)
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case *symlink:
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stat.Mask |= linux.STATX_SIZE | linux.STATX_BLOCKS
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stat.Size = uint64(len(impl.target))
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stat.Blocks = allocatedBlocksForSize(stat.Size)
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case *deviceFile:
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stat.RdevMajor = impl.major
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stat.RdevMinor = impl.minor
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case *socketFile, *directory, *namedPipe:
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// Nothing to do.
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default:
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panic(fmt.Sprintf("unknown inode type: %T", i.impl))
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}
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}
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func (i *inode) setStat(ctx context.Context, creds *auth.Credentials, stat *linux.Statx) error {
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if stat.Mask == 0 {
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return nil
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}
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if stat.Mask&^(linux.STATX_MODE|linux.STATX_UID|linux.STATX_GID|linux.STATX_ATIME|linux.STATX_MTIME|linux.STATX_CTIME|linux.STATX_SIZE) != 0 {
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return syserror.EPERM
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}
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mode := linux.FileMode(atomic.LoadUint32(&i.mode))
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if err := vfs.CheckSetStat(ctx, creds, stat, mode, auth.KUID(atomic.LoadUint32(&i.uid)), auth.KGID(atomic.LoadUint32(&i.gid))); err != nil {
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return err
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}
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i.mu.Lock()
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var (
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needsMtimeBump bool
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needsCtimeBump bool
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)
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mask := stat.Mask
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if mask&linux.STATX_MODE != 0 {
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ft := atomic.LoadUint32(&i.mode) & linux.S_IFMT
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atomic.StoreUint32(&i.mode, ft|uint32(stat.Mode&^linux.S_IFMT))
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needsCtimeBump = true
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}
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if mask&linux.STATX_UID != 0 {
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atomic.StoreUint32(&i.uid, stat.UID)
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needsCtimeBump = true
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}
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if mask&linux.STATX_GID != 0 {
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atomic.StoreUint32(&i.gid, stat.GID)
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needsCtimeBump = true
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}
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if mask&linux.STATX_SIZE != 0 {
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switch impl := i.impl.(type) {
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case *regularFile:
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updated, err := impl.truncateLocked(stat.Size)
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if err != nil {
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return err
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}
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if updated {
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needsMtimeBump = true
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needsCtimeBump = true
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}
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case *directory:
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return syserror.EISDIR
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default:
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return syserror.EINVAL
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}
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}
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now := i.clock.Now().Nanoseconds()
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if mask&linux.STATX_ATIME != 0 {
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if stat.Atime.Nsec == linux.UTIME_NOW {
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atomic.StoreInt64(&i.atime, now)
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} else {
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atomic.StoreInt64(&i.atime, stat.Atime.ToNsecCapped())
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}
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needsCtimeBump = true
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}
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if mask&linux.STATX_MTIME != 0 {
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if stat.Mtime.Nsec == linux.UTIME_NOW {
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atomic.StoreInt64(&i.mtime, now)
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} else {
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atomic.StoreInt64(&i.mtime, stat.Mtime.ToNsecCapped())
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}
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needsCtimeBump = true
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// Ignore the mtime bump, since we just set it ourselves.
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needsMtimeBump = false
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}
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if mask&linux.STATX_CTIME != 0 {
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if stat.Ctime.Nsec == linux.UTIME_NOW {
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atomic.StoreInt64(&i.ctime, now)
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} else {
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atomic.StoreInt64(&i.ctime, stat.Ctime.ToNsecCapped())
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}
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// Ignore the ctime bump, since we just set it ourselves.
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needsCtimeBump = false
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}
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if needsMtimeBump {
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atomic.StoreInt64(&i.mtime, now)
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}
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if needsCtimeBump {
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atomic.StoreInt64(&i.ctime, now)
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}
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i.mu.Unlock()
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return nil
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}
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// TODO(gvisor.dev/issue/1480): support file locking for file types other than regular.
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func (i *inode) lockBSD(uid fslock.UniqueID, t fslock.LockType, block fslock.Blocker) error {
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switch i.impl.(type) {
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case *regularFile:
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return i.locks.LockBSD(uid, t, block)
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}
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return syserror.EBADF
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}
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// TODO(gvisor.dev/issue/1480): support file locking for file types other than regular.
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func (i *inode) unlockBSD(uid fslock.UniqueID) error {
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switch i.impl.(type) {
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case *regularFile:
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i.locks.UnlockBSD(uid)
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return nil
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}
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return syserror.EBADF
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}
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// TODO(gvisor.dev/issue/1480): support file locking for file types other than regular.
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func (i *inode) lockPOSIX(uid fslock.UniqueID, t fslock.LockType, rng fslock.LockRange, block fslock.Blocker) error {
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switch i.impl.(type) {
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case *regularFile:
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return i.locks.LockPOSIX(uid, t, rng, block)
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}
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return syserror.EBADF
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}
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// TODO(gvisor.dev/issue/1480): support file locking for file types other than regular.
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func (i *inode) unlockPOSIX(uid fslock.UniqueID, rng fslock.LockRange) error {
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switch i.impl.(type) {
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case *regularFile:
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i.locks.UnlockPOSIX(uid, rng)
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return nil
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}
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return syserror.EBADF
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}
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// allocatedBlocksForSize returns the number of 512B blocks needed to
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// accommodate the given size in bytes, as appropriate for struct
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// stat::st_blocks and struct statx::stx_blocks. (Note that this 512B block
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// size is independent of the "preferred block size for I/O", struct
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// stat::st_blksize and struct statx::stx_blksize.)
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func allocatedBlocksForSize(size uint64) uint64 {
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return (size + 511) / 512
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}
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func (i *inode) direntType() uint8 {
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switch impl := i.impl.(type) {
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case *regularFile:
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return linux.DT_REG
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case *directory:
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return linux.DT_DIR
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case *symlink:
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return linux.DT_LNK
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case *socketFile:
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return linux.DT_SOCK
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case *deviceFile:
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switch impl.kind {
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case vfs.BlockDevice:
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return linux.DT_BLK
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case vfs.CharDevice:
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|
return linux.DT_CHR
|
|
default:
|
|
panic(fmt.Sprintf("unknown vfs.DeviceKind: %v", impl.kind))
|
|
}
|
|
default:
|
|
panic(fmt.Sprintf("unknown inode type: %T", i.impl))
|
|
}
|
|
}
|
|
|
|
func (i *inode) isDir() bool {
|
|
return linux.FileMode(i.mode).FileType() == linux.S_IFDIR
|
|
}
|
|
|
|
func (i *inode) touchAtime(mnt *vfs.Mount) {
|
|
if err := mnt.CheckBeginWrite(); err != nil {
|
|
return
|
|
}
|
|
now := i.clock.Now().Nanoseconds()
|
|
i.mu.Lock()
|
|
atomic.StoreInt64(&i.atime, now)
|
|
i.mu.Unlock()
|
|
mnt.EndWrite()
|
|
}
|
|
|
|
// Preconditions: The caller has called vfs.Mount.CheckBeginWrite().
|
|
func (i *inode) touchCtime() {
|
|
now := i.clock.Now().Nanoseconds()
|
|
i.mu.Lock()
|
|
atomic.StoreInt64(&i.ctime, now)
|
|
i.mu.Unlock()
|
|
}
|
|
|
|
// Preconditions: The caller has called vfs.Mount.CheckBeginWrite().
|
|
func (i *inode) touchCMtime() {
|
|
now := i.clock.Now().Nanoseconds()
|
|
i.mu.Lock()
|
|
atomic.StoreInt64(&i.mtime, now)
|
|
atomic.StoreInt64(&i.ctime, now)
|
|
i.mu.Unlock()
|
|
}
|
|
|
|
// Preconditions: The caller has called vfs.Mount.CheckBeginWrite() and holds
|
|
// inode.mu.
|
|
func (i *inode) touchCMtimeLocked() {
|
|
now := i.clock.Now().Nanoseconds()
|
|
atomic.StoreInt64(&i.mtime, now)
|
|
atomic.StoreInt64(&i.ctime, now)
|
|
}
|
|
|
|
// fileDescription is embedded by tmpfs implementations of
|
|
// vfs.FileDescriptionImpl.
|
|
type fileDescription struct {
|
|
vfsfd vfs.FileDescription
|
|
vfs.FileDescriptionDefaultImpl
|
|
}
|
|
|
|
func (fd *fileDescription) filesystem() *filesystem {
|
|
return fd.vfsfd.Mount().Filesystem().Impl().(*filesystem)
|
|
}
|
|
|
|
func (fd *fileDescription) inode() *inode {
|
|
return fd.vfsfd.Dentry().Impl().(*dentry).inode
|
|
}
|
|
|
|
// Stat implements vfs.FileDescriptionImpl.Stat.
|
|
func (fd *fileDescription) Stat(ctx context.Context, opts vfs.StatOptions) (linux.Statx, error) {
|
|
var stat linux.Statx
|
|
fd.inode().statTo(&stat)
|
|
return stat, nil
|
|
}
|
|
|
|
// SetStat implements vfs.FileDescriptionImpl.SetStat.
|
|
func (fd *fileDescription) SetStat(ctx context.Context, opts vfs.SetStatOptions) error {
|
|
creds := auth.CredentialsFromContext(ctx)
|
|
return fd.inode().setStat(ctx, creds, &opts.Stat)
|
|
}
|