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-rw-r--r--pkg/abi/linux/time.go13
-rw-r--r--pkg/sentry/fsimpl/tmpfs/BUILD2
-rw-r--r--pkg/sentry/fsimpl/tmpfs/filesystem.go16
-rw-r--r--pkg/sentry/fsimpl/tmpfs/regular_file_test.go129
-rw-r--r--pkg/sentry/fsimpl/tmpfs/stat_test.go232
-rw-r--r--pkg/sentry/fsimpl/tmpfs/tmpfs.go72
6 files changed, 425 insertions, 39 deletions
diff --git a/pkg/abi/linux/time.go b/pkg/abi/linux/time.go
index 546668bca..5c5a58cd4 100644
--- a/pkg/abi/linux/time.go
+++ b/pkg/abi/linux/time.go
@@ -234,6 +234,19 @@ type StatxTimestamp struct {
_ int32
}
+// ToNsec returns the nanosecond representation.
+func (sxts StatxTimestamp) ToNsec() int64 {
+ return int64(sxts.Sec)*1e9 + int64(sxts.Nsec)
+}
+
+// ToNsecCapped returns the safe nanosecond representation.
+func (sxts StatxTimestamp) ToNsecCapped() int64 {
+ if sxts.Sec > maxSecInDuration {
+ return math.MaxInt64
+ }
+ return sxts.ToNsec()
+}
+
// NsecToStatxTimestamp translates nanoseconds to StatxTimestamp.
func NsecToStatxTimestamp(nsec int64) (ts StatxTimestamp) {
return StatxTimestamp{
diff --git a/pkg/sentry/fsimpl/tmpfs/BUILD b/pkg/sentry/fsimpl/tmpfs/BUILD
index 82f5c2f41..7601c7c04 100644
--- a/pkg/sentry/fsimpl/tmpfs/BUILD
+++ b/pkg/sentry/fsimpl/tmpfs/BUILD
@@ -40,6 +40,7 @@ go_library(
"//pkg/sentry/kernel",
"//pkg/sentry/kernel/auth",
"//pkg/sentry/kernel/pipe",
+ "//pkg/sentry/kernel/time",
"//pkg/sentry/memmap",
"//pkg/sentry/pgalloc",
"//pkg/sentry/platform",
@@ -77,6 +78,7 @@ go_test(
srcs = [
"pipe_test.go",
"regular_file_test.go",
+ "stat_test.go",
],
embed = [":tmpfs"],
deps = [
diff --git a/pkg/sentry/fsimpl/tmpfs/filesystem.go b/pkg/sentry/fsimpl/tmpfs/filesystem.go
index 26979729e..4cd7e9aea 100644
--- a/pkg/sentry/fsimpl/tmpfs/filesystem.go
+++ b/pkg/sentry/fsimpl/tmpfs/filesystem.go
@@ -56,7 +56,8 @@ afterSymlink:
}
next := nextVFSD.Impl().(*dentry)
if symlink, ok := next.inode.impl.(*symlink); ok && rp.ShouldFollowSymlink() {
- // TODO: symlink traversals update access time
+ // TODO(gvisor.dev/issues/1197): Symlink traversals updates
+ // access time.
if err := rp.HandleSymlink(symlink.target); err != nil {
return nil, err
}
@@ -501,7 +502,8 @@ func (fs *filesystem) RenameAt(ctx context.Context, rp *vfs.ResolvingPath, oldPa
oldParent.inode.decLinksLocked()
newParent.inode.incLinksLocked()
}
- // TODO: update timestamps and parent directory sizes
+ // TODO(gvisor.dev/issues/1197): Update timestamps and parent directory
+ // sizes.
vfsObj.CommitRenameReplaceDentry(renamedVFSD, &newParent.vfsd, newName, replacedVFSD)
return nil
}
@@ -555,15 +557,11 @@ func (fs *filesystem) RmdirAt(ctx context.Context, rp *vfs.ResolvingPath) error
func (fs *filesystem) SetStatAt(ctx context.Context, rp *vfs.ResolvingPath, opts vfs.SetStatOptions) error {
fs.mu.RLock()
defer fs.mu.RUnlock()
- _, err := resolveLocked(rp)
+ d, err := resolveLocked(rp)
if err != nil {
return err
}
- if opts.Stat.Mask == 0 {
- return nil
- }
- // TODO: implement inode.setStat
- return syserror.EPERM
+ return d.inode.setStat(opts.Stat)
}
// StatAt implements vfs.FilesystemImpl.StatAt.
@@ -587,7 +585,7 @@ func (fs *filesystem) StatFSAt(ctx context.Context, rp *vfs.ResolvingPath) (linu
if err != nil {
return linux.Statfs{}, err
}
- // TODO: actually implement statfs
+ // TODO(gvisor.dev/issues/1197): Actually implement statfs.
return linux.Statfs{}, syserror.ENOSYS
}
diff --git a/pkg/sentry/fsimpl/tmpfs/regular_file_test.go b/pkg/sentry/fsimpl/tmpfs/regular_file_test.go
index 3731c5b6f..7b0a962f0 100644
--- a/pkg/sentry/fsimpl/tmpfs/regular_file_test.go
+++ b/pkg/sentry/fsimpl/tmpfs/regular_file_test.go
@@ -18,6 +18,7 @@ import (
"bytes"
"fmt"
"io"
+ "sync/atomic"
"testing"
"gvisor.dev/gvisor/pkg/abi/linux"
@@ -29,10 +30,12 @@ import (
"gvisor.dev/gvisor/pkg/sentry/vfs"
)
-// newFileFD creates a new file in a new tmpfs mount, and returns the FD. If
-// the returned err is not nil, then cleanup should be called when the FD is no
-// longer needed.
-func newFileFD(ctx context.Context, filename string) (*vfs.FileDescription, func(), error) {
+// nextFileID is used to generate unique file names.
+var nextFileID int64
+
+// newTmpfsRoot creates a new tmpfs mount, and returns the root. If the error
+// is not nil, then cleanup should be called when the root is no longer needed.
+func newTmpfsRoot(ctx context.Context) (*vfs.VirtualFilesystem, vfs.VirtualDentry, func(), error) {
creds := auth.CredentialsFromContext(ctx)
vfsObj := vfs.New()
@@ -41,36 +44,124 @@ func newFileFD(ctx context.Context, filename string) (*vfs.FileDescription, func
})
mntns, err := vfsObj.NewMountNamespace(ctx, creds, "", "tmpfs", &vfs.GetFilesystemOptions{})
if err != nil {
- return nil, nil, fmt.Errorf("failed to create tmpfs root mount: %v", err)
+ return nil, vfs.VirtualDentry{}, nil, fmt.Errorf("failed to create tmpfs root mount: %v", err)
}
root := mntns.Root()
+ return vfsObj, root, func() {
+ root.DecRef()
+ mntns.DecRef(vfsObj)
+ }, nil
+}
+
+// newFileFD creates a new file in a new tmpfs mount, and returns the FD. If
+// the returned err is not nil, then cleanup should be called when the FD is no
+// longer needed.
+func newFileFD(ctx context.Context, mode linux.FileMode) (*vfs.FileDescription, func(), error) {
+ creds := auth.CredentialsFromContext(ctx)
+ vfsObj, root, cleanup, err := newTmpfsRoot(ctx)
+ if err != nil {
+ return nil, nil, err
+ }
+
+ filename := fmt.Sprintf("tmpfs-test-file-%d", atomic.AddInt64(&nextFileID, 1))
// Create the file that will be write/read.
fd, err := vfsObj.OpenAt(ctx, creds, &vfs.PathOperation{
- Root: root,
- Start: root,
- Path: fspath.Parse(filename),
- FollowFinalSymlink: true,
+ Root: root,
+ Start: root,
+ Path: fspath.Parse(filename),
}, &vfs.OpenOptions{
Flags: linux.O_RDWR | linux.O_CREAT | linux.O_EXCL,
- Mode: 0644,
+ Mode: linux.ModeRegular | mode,
})
if err != nil {
- root.DecRef()
- mntns.DecRef(vfsObj)
+ cleanup()
return nil, nil, fmt.Errorf("failed to create file %q: %v", filename, err)
}
- return fd, func() {
- root.DecRef()
- mntns.DecRef(vfsObj)
- }, nil
+ return fd, cleanup, nil
+}
+
+// newDirFD is like newFileFD, but for directories.
+func newDirFD(ctx context.Context, mode linux.FileMode) (*vfs.FileDescription, func(), error) {
+ creds := auth.CredentialsFromContext(ctx)
+ vfsObj, root, cleanup, err := newTmpfsRoot(ctx)
+ if err != nil {
+ return nil, nil, err
+ }
+
+ dirname := fmt.Sprintf("tmpfs-test-dir-%d", atomic.AddInt64(&nextFileID, 1))
+
+ // Create the dir.
+ if err := vfsObj.MkdirAt(ctx, creds, &vfs.PathOperation{
+ Root: root,
+ Start: root,
+ Path: fspath.Parse(dirname),
+ }, &vfs.MkdirOptions{
+ Mode: linux.ModeDirectory | mode,
+ }); err != nil {
+ cleanup()
+ return nil, nil, fmt.Errorf("failed to create directory %q: %v", dirname, err)
+ }
+
+ // Open the dir and return it.
+ fd, err := vfsObj.OpenAt(ctx, creds, &vfs.PathOperation{
+ Root: root,
+ Start: root,
+ Path: fspath.Parse(dirname),
+ }, &vfs.OpenOptions{
+ Flags: linux.O_RDONLY | linux.O_DIRECTORY,
+ })
+ if err != nil {
+ cleanup()
+ return nil, nil, fmt.Errorf("failed to open directory %q: %v", dirname, err)
+ }
+
+ return fd, cleanup, nil
+}
+
+// newPipeFD is like newFileFD, but for pipes.
+func newPipeFD(ctx context.Context, mode linux.FileMode) (*vfs.FileDescription, func(), error) {
+ creds := auth.CredentialsFromContext(ctx)
+ vfsObj, root, cleanup, err := newTmpfsRoot(ctx)
+ if err != nil {
+ return nil, nil, err
+ }
+
+ pipename := fmt.Sprintf("tmpfs-test-pipe-%d", atomic.AddInt64(&nextFileID, 1))
+
+ // Create the pipe.
+ if err := vfsObj.MknodAt(ctx, creds, &vfs.PathOperation{
+ Root: root,
+ Start: root,
+ Path: fspath.Parse(pipename),
+ }, &vfs.MknodOptions{
+ Mode: linux.ModeNamedPipe | mode,
+ }); err != nil {
+ cleanup()
+ return nil, nil, fmt.Errorf("failed to create pipe %q: %v", pipename, err)
+ }
+
+ // Open the pipe and return it.
+ fd, err := vfsObj.OpenAt(ctx, creds, &vfs.PathOperation{
+ Root: root,
+ Start: root,
+ Path: fspath.Parse(pipename),
+ }, &vfs.OpenOptions{
+ Flags: linux.O_RDWR,
+ })
+ if err != nil {
+ cleanup()
+ return nil, nil, fmt.Errorf("failed to open pipe %q: %v", pipename, err)
+ }
+
+ return fd, cleanup, nil
}
// Test that we can write some data to a file and read it back.`
func TestSimpleWriteRead(t *testing.T) {
ctx := contexttest.Context(t)
- fd, cleanup, err := newFileFD(ctx, "simpleReadWrite")
+ fd, cleanup, err := newFileFD(ctx, 0644)
if err != nil {
t.Fatal(err)
}
@@ -116,7 +207,7 @@ func TestSimpleWriteRead(t *testing.T) {
func TestPWrite(t *testing.T) {
ctx := contexttest.Context(t)
- fd, cleanup, err := newFileFD(ctx, "PRead")
+ fd, cleanup, err := newFileFD(ctx, 0644)
if err != nil {
t.Fatal(err)
}
@@ -171,7 +262,7 @@ func TestPWrite(t *testing.T) {
func TestPRead(t *testing.T) {
ctx := contexttest.Context(t)
- fd, cleanup, err := newFileFD(ctx, "PRead")
+ fd, cleanup, err := newFileFD(ctx, 0644)
if err != nil {
t.Fatal(err)
}
diff --git a/pkg/sentry/fsimpl/tmpfs/stat_test.go b/pkg/sentry/fsimpl/tmpfs/stat_test.go
new file mode 100644
index 000000000..ebe035dee
--- /dev/null
+++ b/pkg/sentry/fsimpl/tmpfs/stat_test.go
@@ -0,0 +1,232 @@
+// Copyright 2020 The gVisor Authors.
+//
+// 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 tmpfs
+
+import (
+ "fmt"
+ "testing"
+
+ "gvisor.dev/gvisor/pkg/abi/linux"
+ "gvisor.dev/gvisor/pkg/sentry/kernel/auth"
+ "gvisor.dev/gvisor/pkg/sentry/kernel/contexttest"
+ "gvisor.dev/gvisor/pkg/sentry/vfs"
+)
+
+func TestStatAfterCreate(t *testing.T) {
+ ctx := contexttest.Context(t)
+ mode := linux.FileMode(0644)
+
+ // Run with different file types.
+ // TODO(gvisor.dev/issues/1197): Also test symlinks and sockets.
+ for _, typ := range []string{"file", "dir", "pipe"} {
+ t.Run(fmt.Sprintf("type=%q", typ), func(t *testing.T) {
+ var (
+ fd *vfs.FileDescription
+ cleanup func()
+ err error
+ )
+ switch typ {
+ case "file":
+ fd, cleanup, err = newFileFD(ctx, mode)
+ case "dir":
+ fd, cleanup, err = newDirFD(ctx, mode)
+ case "pipe":
+ fd, cleanup, err = newPipeFD(ctx, mode)
+ default:
+ panic(fmt.Sprintf("unknown typ %q", typ))
+ }
+ if err != nil {
+ t.Fatal(err)
+ }
+ defer cleanup()
+
+ got, err := fd.Stat(ctx, vfs.StatOptions{})
+ if err != nil {
+ t.Fatalf("Stat failed: %v", err)
+ }
+
+ // Atime, Ctime, Mtime should all be current time (non-zero).
+ atime, ctime, mtime := got.Atime.ToNsec(), got.Ctime.ToNsec(), got.Mtime.ToNsec()
+ if atime != ctime || ctime != mtime {
+ t.Errorf("got atime=%d ctime=%d mtime=%d, wanted equal values", atime, ctime, mtime)
+ }
+ if atime == 0 {
+ t.Errorf("got atime=%d, want non-zero", atime)
+ }
+
+ // Btime should be 0, as it is not set by tmpfs.
+ if btime := got.Btime.ToNsec(); btime != 0 {
+ t.Errorf("got btime %d, want 0", got.Btime.ToNsec())
+ }
+
+ // Size should be 0.
+ if got.Size != 0 {
+ t.Errorf("got size %d, want 0", got.Size)
+ }
+
+ // Nlink should be 1 for files, 2 for dirs.
+ wantNlink := uint32(1)
+ if typ == "dir" {
+ wantNlink = 2
+ }
+ if got.Nlink != wantNlink {
+ t.Errorf("got nlink %d, want %d", got.Nlink, wantNlink)
+ }
+
+ // UID and GID are set from context creds.
+ creds := auth.CredentialsFromContext(ctx)
+ if got.UID != uint32(creds.EffectiveKUID) {
+ t.Errorf("got uid %d, want %d", got.UID, uint32(creds.EffectiveKUID))
+ }
+ if got.GID != uint32(creds.EffectiveKGID) {
+ t.Errorf("got gid %d, want %d", got.GID, uint32(creds.EffectiveKGID))
+ }
+
+ // Mode.
+ wantMode := uint16(mode)
+ switch typ {
+ case "file":
+ wantMode |= linux.S_IFREG
+ case "dir":
+ wantMode |= linux.S_IFDIR
+ case "pipe":
+ wantMode |= linux.S_IFIFO
+ default:
+ panic(fmt.Sprintf("unknown typ %q", typ))
+ }
+
+ if got.Mode != wantMode {
+ t.Errorf("got mode %x, want %x", got.Mode, wantMode)
+ }
+
+ // Ino.
+ if got.Ino == 0 {
+ t.Errorf("got ino %d, want not 0", got.Ino)
+ }
+ })
+ }
+}
+
+func TestSetStatAtime(t *testing.T) {
+ ctx := contexttest.Context(t)
+ fd, cleanup, err := newFileFD(ctx, 0644)
+ if err != nil {
+ t.Fatal(err)
+ }
+ defer cleanup()
+
+ allStatOptions := vfs.StatOptions{Mask: linux.STATX_ALL}
+
+ // Get initial stat.
+ initialStat, err := fd.Stat(ctx, allStatOptions)
+ if err != nil {
+ t.Fatalf("Stat failed: %v", err)
+ }
+
+ // Set atime, but without the mask.
+ if err := fd.SetStat(ctx, vfs.SetStatOptions{Stat: linux.Statx{
+ Mask: 0,
+ Atime: linux.NsecToStatxTimestamp(100),
+ }}); err != nil {
+ t.Errorf("SetStat atime without mask failed: %v")
+ }
+ // Atime should be unchanged.
+ if gotStat, err := fd.Stat(ctx, allStatOptions); err != nil {
+ t.Errorf("Stat got error: %v", err)
+ } else if gotStat.Atime != initialStat.Atime {
+ t.Errorf("Stat got atime %d, want %d", gotStat.Atime, initialStat.Atime)
+ }
+
+ // Set atime, this time included in the mask.
+ setStat := linux.Statx{
+ Mask: linux.STATX_ATIME,
+ Atime: linux.NsecToStatxTimestamp(100),
+ }
+ if err := fd.SetStat(ctx, vfs.SetStatOptions{Stat: setStat}); err != nil {
+ t.Errorf("SetStat atime with mask failed: %v")
+ }
+ if gotStat, err := fd.Stat(ctx, allStatOptions); err != nil {
+ t.Errorf("Stat got error: %v", err)
+ } else if gotStat.Atime != setStat.Atime {
+ t.Errorf("Stat got atime %d, want %d", gotStat.Atime, setStat.Atime)
+ }
+}
+
+func TestSetStat(t *testing.T) {
+ ctx := contexttest.Context(t)
+ mode := linux.FileMode(0644)
+
+ // Run with different file types.
+ // TODO(gvisor.dev/issues/1197): Also test symlinks and sockets.
+ for _, typ := range []string{"file", "dir", "pipe"} {
+ t.Run(fmt.Sprintf("type=%q", typ), func(t *testing.T) {
+ var (
+ fd *vfs.FileDescription
+ cleanup func()
+ err error
+ )
+ switch typ {
+ case "file":
+ fd, cleanup, err = newFileFD(ctx, mode)
+ case "dir":
+ fd, cleanup, err = newDirFD(ctx, mode)
+ case "pipe":
+ fd, cleanup, err = newPipeFD(ctx, mode)
+ default:
+ panic(fmt.Sprintf("unknown typ %q", typ))
+ }
+ if err != nil {
+ t.Fatal(err)
+ }
+ defer cleanup()
+
+ allStatOptions := vfs.StatOptions{Mask: linux.STATX_ALL}
+
+ // Get initial stat.
+ initialStat, err := fd.Stat(ctx, allStatOptions)
+ if err != nil {
+ t.Fatalf("Stat failed: %v", err)
+ }
+
+ // Set atime, but without the mask.
+ if err := fd.SetStat(ctx, vfs.SetStatOptions{Stat: linux.Statx{
+ Mask: 0,
+ Atime: linux.NsecToStatxTimestamp(100),
+ }}); err != nil {
+ t.Errorf("SetStat atime without mask failed: %v")
+ }
+ // Atime should be unchanged.
+ if gotStat, err := fd.Stat(ctx, allStatOptions); err != nil {
+ t.Errorf("Stat got error: %v", err)
+ } else if gotStat.Atime != initialStat.Atime {
+ t.Errorf("Stat got atime %d, want %d", gotStat.Atime, initialStat.Atime)
+ }
+
+ // Set atime, this time included in the mask.
+ setStat := linux.Statx{
+ Mask: linux.STATX_ATIME,
+ Atime: linux.NsecToStatxTimestamp(100),
+ }
+ if err := fd.SetStat(ctx, vfs.SetStatOptions{Stat: setStat}); err != nil {
+ t.Errorf("SetStat atime with mask failed: %v")
+ }
+ if gotStat, err := fd.Stat(ctx, allStatOptions); err != nil {
+ t.Errorf("Stat got error: %v", err)
+ } else if gotStat.Atime != setStat.Atime {
+ t.Errorf("Stat got atime %d, want %d", gotStat.Atime, setStat.Atime)
+ }
+ })
+ }
+}
diff --git a/pkg/sentry/fsimpl/tmpfs/tmpfs.go b/pkg/sentry/fsimpl/tmpfs/tmpfs.go
index 701826f90..d6960ee47 100644
--- a/pkg/sentry/fsimpl/tmpfs/tmpfs.go
+++ b/pkg/sentry/fsimpl/tmpfs/tmpfs.go
@@ -31,10 +31,10 @@ import (
"gvisor.dev/gvisor/pkg/abi/linux"
"gvisor.dev/gvisor/pkg/sentry/context"
"gvisor.dev/gvisor/pkg/sentry/kernel/auth"
+ "gvisor.dev/gvisor/pkg/sentry/kernel/time"
"gvisor.dev/gvisor/pkg/sentry/pgalloc"
"gvisor.dev/gvisor/pkg/sentry/vfs"
"gvisor.dev/gvisor/pkg/sync"
- "gvisor.dev/gvisor/pkg/syserror"
)
// FilesystemType implements vfs.FilesystemType.
@@ -47,6 +47,9 @@ type filesystem struct {
// memFile is used to allocate pages to for regular files.
memFile *pgalloc.MemoryFile
+ // clock is a realtime clock used to set timestamps in file operations.
+ clock time.Clock
+
// mu serializes changes to the Dentry tree.
mu sync.RWMutex
@@ -59,8 +62,10 @@ func (fstype FilesystemType) GetFilesystem(ctx context.Context, vfsObj *vfs.Virt
if memFileProvider == nil {
panic("MemoryFileProviderFromContext returned nil")
}
+ clock := time.RealtimeClockFromContext(ctx)
fs := filesystem{
memFile: memFileProvider.MemoryFile(),
+ clock: clock,
}
fs.vfsfs.Init(vfsObj, &fs)
root := fs.newDentry(fs.newDirectory(creds, 01777))
@@ -126,26 +131,36 @@ type inode struct {
// filesystem.RmdirAt() drops the reference.
refs int64
- // Inode metadata; protected by mu and accessed using atomic memory
- // operations unless otherwise specified.
- mu sync.RWMutex
+ // Inode metadata. Writing multiple fields atomically requires holding
+ // mu, othewise atomic operations can be used.
+ mu sync.Mutex
mode uint32 // excluding file type bits, which are based on impl
nlink uint32 // protected by filesystem.mu instead of inode.mu
uid uint32 // auth.KUID, but stored as raw uint32 for sync/atomic
gid uint32 // auth.KGID, but ...
ino uint64 // immutable
+ // Linux's tmpfs has no concept of btime.
+ atime int64 // nanoseconds
+ ctime int64 // nanoseconds
+ mtime int64 // nanoseconds
+
impl interface{} // immutable
}
const maxLinks = math.MaxUint32
func (i *inode) init(impl interface{}, fs *filesystem, creds *auth.Credentials, mode linux.FileMode) {
+ now := fs.clock.Now().Nanoseconds()
i.refs = 1
i.mode = uint32(mode)
i.uid = uint32(creds.EffectiveKUID)
i.gid = uint32(creds.EffectiveKGID)
i.ino = atomic.AddUint64(&fs.nextInoMinusOne, 1)
+ // Tmpfs creation sets atime, ctime, and mtime to current time.
+ i.atime = now
+ i.ctime = now
+ i.mtime = now
// i.nlink initialized by caller
i.impl = impl
}
@@ -213,15 +228,24 @@ func (i *inode) checkPermissions(creds *auth.Credentials, ats vfs.AccessTypes, i
// Go won't inline this function, and returning linux.Statx (which is quite
// big) means spending a lot of time in runtime.duffcopy(), so instead it's an
// output parameter.
+//
+// Note that Linux does not guarantee to return consistent data (in the case of
+// a concurrent modification), so we do not require holding inode.mu.
func (i *inode) statTo(stat *linux.Statx) {
- stat.Mask = linux.STATX_TYPE | linux.STATX_MODE | linux.STATX_NLINK | linux.STATX_UID | linux.STATX_GID | linux.STATX_INO
+ stat.Mask = linux.STATX_TYPE | linux.STATX_MODE | linux.STATX_NLINK |
+ linux.STATX_UID | linux.STATX_GID | linux.STATX_INO | linux.STATX_ATIME |
+ linux.STATX_BTIME | linux.STATX_CTIME | linux.STATX_MTIME
stat.Blksize = 1 // usermem.PageSize in tmpfs
stat.Nlink = atomic.LoadUint32(&i.nlink)
stat.UID = atomic.LoadUint32(&i.uid)
stat.GID = atomic.LoadUint32(&i.gid)
stat.Mode = uint16(atomic.LoadUint32(&i.mode))
stat.Ino = i.ino
- // TODO: device number
+ // Linux's tmpfs has no concept of btime, so zero-value is returned.
+ stat.Atime = linux.NsecToStatxTimestamp(i.atime)
+ stat.Ctime = linux.NsecToStatxTimestamp(i.ctime)
+ stat.Mtime = linux.NsecToStatxTimestamp(i.mtime)
+ // TODO(gvisor.dev/issues/1197): Device number.
switch impl := i.impl.(type) {
case *regularFile:
stat.Mode |= linux.S_IFREG
@@ -245,6 +269,36 @@ func (i *inode) statTo(stat *linux.Statx) {
}
}
+func (i *inode) setStat(stat linux.Statx) error {
+ // TODO(gvisor.dev/issues/1197): Handle stat.Size by growing/shrinking
+ // the file.
+ if stat.Mask == 0 {
+ return nil
+ }
+ i.mu.Lock()
+ mask := stat.Mask
+ if mask&linux.STATX_MODE != 0 {
+ atomic.StoreUint32(&i.mode, uint32(stat.Mode))
+ }
+ if mask&linux.STATX_UID != 0 {
+ atomic.StoreUint32(&i.uid, stat.UID)
+ }
+ if mask&linux.STATX_GID != 0 {
+ atomic.StoreUint32(&i.gid, stat.GID)
+ }
+ if mask&linux.STATX_ATIME != 0 {
+ atomic.StoreInt64(&i.atime, stat.Atime.ToNsecCapped())
+ }
+ if mask&linux.STATX_CTIME != 0 {
+ atomic.StoreInt64(&i.ctime, stat.Ctime.ToNsecCapped())
+ }
+ if mask&linux.STATX_MTIME != 0 {
+ atomic.StoreInt64(&i.mtime, stat.Mtime.ToNsecCapped())
+ }
+ i.mu.Unlock()
+ return nil
+}
+
// allocatedBlocksForSize returns the number of 512B blocks needed to
// accommodate the given size in bytes, as appropriate for struct
// stat::st_blocks and struct statx::stx_blocks. (Note that this 512B block
@@ -291,9 +345,5 @@ func (fd *fileDescription) Stat(ctx context.Context, opts vfs.StatOptions) (linu
// SetStat implements vfs.FileDescriptionImpl.SetStat.
func (fd *fileDescription) SetStat(ctx context.Context, opts vfs.SetStatOptions) error {
- if opts.Stat.Mask == 0 {
- return nil
- }
- // TODO: implement inode.setStat
- return syserror.EPERM
+ return fd.inode().setStat(opts.Stat)
}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-05 09:19:34 +0000