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-rw-r--r--pkg/sentry/fsimpl/devtmpfs/devtmpfs.go5
-rw-r--r--pkg/sentry/fsimpl/ext/ext.go12
-rw-r--r--pkg/sentry/fsimpl/gofer/gofer.go7
-rw-r--r--pkg/sentry/fsimpl/host/host.go15
-rw-r--r--pkg/sentry/fsimpl/kernfs/kernfs.go7
-rw-r--r--pkg/sentry/fsimpl/kernfs/kernfs_test.go8
-rw-r--r--pkg/sentry/fsimpl/proc/filesystem.go11
-rw-r--r--pkg/sentry/fsimpl/sys/sys.go9
-rw-r--r--pkg/sentry/fsimpl/tmpfs/tmpfs.go7
-rw-r--r--pkg/sentry/vfs/anonfs.go13
-rw-r--r--pkg/sentry/vfs/filesystem.go11
-rw-r--r--pkg/sentry/vfs/filesystem_type.go3
-rw-r--r--pkg/sentry/vfs/vfs.go2
13 files changed, 91 insertions, 19 deletions
diff --git a/pkg/sentry/fsimpl/devtmpfs/devtmpfs.go b/pkg/sentry/fsimpl/devtmpfs/devtmpfs.go
index abd4f24e7..64f1b142c 100644
--- a/pkg/sentry/fsimpl/devtmpfs/devtmpfs.go
+++ b/pkg/sentry/fsimpl/devtmpfs/devtmpfs.go
@@ -42,6 +42,11 @@ type FilesystemType struct {
root *vfs.Dentry
}
+// Name implements vfs.FilesystemType.Name.
+func (*FilesystemType) Name() string {
+ return Name
+}
+
// GetFilesystem implements vfs.FilesystemType.GetFilesystem.
func (fst *FilesystemType) GetFilesystem(ctx context.Context, vfsObj *vfs.VirtualFilesystem, creds *auth.Credentials, source string, opts vfs.GetFilesystemOptions) (*vfs.Filesystem, *vfs.Dentry, error) {
fst.initOnce.Do(func() {
diff --git a/pkg/sentry/fsimpl/ext/ext.go b/pkg/sentry/fsimpl/ext/ext.go
index 373d23b74..7176af6d1 100644
--- a/pkg/sentry/fsimpl/ext/ext.go
+++ b/pkg/sentry/fsimpl/ext/ext.go
@@ -30,6 +30,9 @@ import (
"gvisor.dev/gvisor/pkg/syserror"
)
+// Name is the name of this filesystem.
+const Name = "ext"
+
// FilesystemType implements vfs.FilesystemType.
type FilesystemType struct{}
@@ -91,8 +94,13 @@ func isCompatible(sb disklayout.SuperBlock) bool {
return true
}
+// Name implements vfs.FilesystemType.Name.
+func (FilesystemType) Name() string {
+ return Name
+}
+
// GetFilesystem implements vfs.FilesystemType.GetFilesystem.
-func (FilesystemType) GetFilesystem(ctx context.Context, vfsObj *vfs.VirtualFilesystem, creds *auth.Credentials, source string, opts vfs.GetFilesystemOptions) (*vfs.Filesystem, *vfs.Dentry, error) {
+func (fsType FilesystemType) GetFilesystem(ctx context.Context, vfsObj *vfs.VirtualFilesystem, creds *auth.Credentials, source string, opts vfs.GetFilesystemOptions) (*vfs.Filesystem, *vfs.Dentry, error) {
// TODO(b/134676337): Ensure that the user is mounting readonly. If not,
// EACCESS should be returned according to mount(2). Filesystem independent
// flags (like readonly) are currently not available in pkg/sentry/vfs.
@@ -103,7 +111,7 @@ func (FilesystemType) GetFilesystem(ctx context.Context, vfsObj *vfs.VirtualFile
}
fs := filesystem{dev: dev, inodeCache: make(map[uint32]*inode)}
- fs.vfsfs.Init(vfsObj, &fs)
+ fs.vfsfs.Init(vfsObj, &fsType, &fs)
fs.sb, err = readSuperBlock(dev)
if err != nil {
return nil, nil, err
diff --git a/pkg/sentry/fsimpl/gofer/gofer.go b/pkg/sentry/fsimpl/gofer/gofer.go
index cf276a417..8e41b6b1c 100644
--- a/pkg/sentry/fsimpl/gofer/gofer.go
+++ b/pkg/sentry/fsimpl/gofer/gofer.go
@@ -199,6 +199,11 @@ const (
InteropModeShared
)
+// Name implements vfs.FilesystemType.Name.
+func (FilesystemType) Name() string {
+ return Name
+}
+
// GetFilesystem implements vfs.FilesystemType.GetFilesystem.
func (fstype FilesystemType) GetFilesystem(ctx context.Context, vfsObj *vfs.VirtualFilesystem, creds *auth.Credentials, source string, opts vfs.GetFilesystemOptions) (*vfs.Filesystem, *vfs.Dentry, error) {
mfp := pgalloc.MemoryFileProviderFromContext(ctx)
@@ -374,7 +379,7 @@ func (fstype FilesystemType) GetFilesystem(ctx context.Context, vfsObj *vfs.Virt
dentries: make(map[*dentry]struct{}),
specialFileFDs: make(map[*specialFileFD]struct{}),
}
- fs.vfsfs.Init(vfsObj, fs)
+ fs.vfsfs.Init(vfsObj, &fstype, fs)
// Construct the root dentry.
root, err := fs.newDentry(ctx, attachFile, qid, attrMask, &attr)
diff --git a/pkg/sentry/fsimpl/host/host.go b/pkg/sentry/fsimpl/host/host.go
index 17e3d6e9d..7d9dcd4c9 100644
--- a/pkg/sentry/fsimpl/host/host.go
+++ b/pkg/sentry/fsimpl/host/host.go
@@ -38,6 +38,19 @@ import (
"gvisor.dev/gvisor/pkg/usermem"
)
+// filesystemType implements vfs.FilesystemType.
+type filesystemType struct{}
+
+// GetFilesystem implements FilesystemType.GetFilesystem.
+func (filesystemType) GetFilesystem(context.Context, *vfs.VirtualFilesystem, *auth.Credentials, string, vfs.GetFilesystemOptions) (*vfs.Filesystem, *vfs.Dentry, error) {
+ panic("cannot instaniate a host filesystem")
+}
+
+// Name implements FilesystemType.Name.
+func (filesystemType) Name() string {
+ return "none"
+}
+
// filesystem implements vfs.FilesystemImpl.
type filesystem struct {
kernfs.Filesystem
@@ -46,7 +59,7 @@ type filesystem struct {
// NewMount returns a new disconnected mount in vfsObj that may be passed to ImportFD.
func NewMount(vfsObj *vfs.VirtualFilesystem) (*vfs.Mount, error) {
fs := &filesystem{}
- fs.Init(vfsObj)
+ fs.Init(vfsObj, &filesystemType{})
vfsfs := fs.VFSFilesystem()
// NewDisconnectedMount will take an additional reference on vfsfs.
defer vfsfs.DecRef()
diff --git a/pkg/sentry/fsimpl/kernfs/kernfs.go b/pkg/sentry/fsimpl/kernfs/kernfs.go
index 794e38908..2cefef020 100644
--- a/pkg/sentry/fsimpl/kernfs/kernfs.go
+++ b/pkg/sentry/fsimpl/kernfs/kernfs.go
@@ -63,9 +63,6 @@ import (
"gvisor.dev/gvisor/pkg/sync"
)
-// FilesystemType implements vfs.FilesystemType.
-type FilesystemType struct{}
-
// Filesystem mostly implements vfs.FilesystemImpl for a generic in-memory
// filesystem. Concrete implementations are expected to embed this in their own
// Filesystem type.
@@ -138,8 +135,8 @@ func (fs *Filesystem) processDeferredDecRefsLocked() {
// Init initializes a kernfs filesystem. This should be called from during
// vfs.FilesystemType.NewFilesystem for the concrete filesystem embedding
// kernfs.
-func (fs *Filesystem) Init(vfsObj *vfs.VirtualFilesystem) {
- fs.vfsfs.Init(vfsObj, fs)
+func (fs *Filesystem) Init(vfsObj *vfs.VirtualFilesystem, fsType vfs.FilesystemType) {
+ fs.vfsfs.Init(vfsObj, fsType, fs)
}
// VFSFilesystem returns the generic vfs filesystem object.
diff --git a/pkg/sentry/fsimpl/kernfs/kernfs_test.go b/pkg/sentry/fsimpl/kernfs/kernfs_test.go
index fb0d25ad7..465451f35 100644
--- a/pkg/sentry/fsimpl/kernfs/kernfs_test.go
+++ b/pkg/sentry/fsimpl/kernfs/kernfs_test.go
@@ -187,9 +187,13 @@ func (*dir) NewNode(context.Context, string, vfs.MknodOptions) (*vfs.Dentry, err
return nil, syserror.EPERM
}
-func (fst *fsType) GetFilesystem(ctx context.Context, vfsObj *vfs.VirtualFilesystem, creds *auth.Credentials, source string, opt vfs.GetFilesystemOptions) (*vfs.Filesystem, *vfs.Dentry, error) {
+func (fsType) Name() string {
+ return "kernfs"
+}
+
+func (fst fsType) GetFilesystem(ctx context.Context, vfsObj *vfs.VirtualFilesystem, creds *auth.Credentials, source string, opt vfs.GetFilesystemOptions) (*vfs.Filesystem, *vfs.Dentry, error) {
fs := &filesystem{}
- fs.Init(vfsObj)
+ fs.Init(vfsObj, &fst)
root := fst.rootFn(creds, fs)
return fs.VFSFilesystem(), root.VFSDentry(), nil
}
diff --git a/pkg/sentry/fsimpl/proc/filesystem.go b/pkg/sentry/fsimpl/proc/filesystem.go
index 5c19d5522..104fc9030 100644
--- a/pkg/sentry/fsimpl/proc/filesystem.go
+++ b/pkg/sentry/fsimpl/proc/filesystem.go
@@ -36,8 +36,13 @@ type FilesystemType struct{}
var _ vfs.FilesystemType = (*FilesystemType)(nil)
-// GetFilesystem implements vfs.FilesystemType.
-func (ft *FilesystemType) GetFilesystem(ctx context.Context, vfsObj *vfs.VirtualFilesystem, creds *auth.Credentials, source string, opts vfs.GetFilesystemOptions) (*vfs.Filesystem, *vfs.Dentry, error) {
+// Name implements vfs.FilesystemType.Name.
+func (FilesystemType) Name() string {
+ return Name
+}
+
+// GetFilesystem implements vfs.FilesystemType.GetFilesystem.
+func (ft FilesystemType) GetFilesystem(ctx context.Context, vfsObj *vfs.VirtualFilesystem, creds *auth.Credentials, source string, opts vfs.GetFilesystemOptions) (*vfs.Filesystem, *vfs.Dentry, error) {
k := kernel.KernelFromContext(ctx)
if k == nil {
return nil, nil, fmt.Errorf("procfs requires a kernel")
@@ -48,7 +53,7 @@ func (ft *FilesystemType) GetFilesystem(ctx context.Context, vfsObj *vfs.Virtual
}
procfs := &kernfs.Filesystem{}
- procfs.VFSFilesystem().Init(vfsObj, procfs)
+ procfs.VFSFilesystem().Init(vfsObj, &ft, procfs)
var cgroups map[string]string
if opts.InternalData != nil {
diff --git a/pkg/sentry/fsimpl/sys/sys.go b/pkg/sentry/fsimpl/sys/sys.go
index 7abfd62f2..5c617270e 100644
--- a/pkg/sentry/fsimpl/sys/sys.go
+++ b/pkg/sentry/fsimpl/sys/sys.go
@@ -39,10 +39,15 @@ type filesystem struct {
kernfs.Filesystem
}
+// Name implements vfs.FilesystemType.Name.
+func (FilesystemType) Name() string {
+ return Name
+}
+
// GetFilesystem implements vfs.FilesystemType.GetFilesystem.
-func (FilesystemType) GetFilesystem(ctx context.Context, vfsObj *vfs.VirtualFilesystem, creds *auth.Credentials, source string, opts vfs.GetFilesystemOptions) (*vfs.Filesystem, *vfs.Dentry, error) {
+func (fsType FilesystemType) GetFilesystem(ctx context.Context, vfsObj *vfs.VirtualFilesystem, creds *auth.Credentials, source string, opts vfs.GetFilesystemOptions) (*vfs.Filesystem, *vfs.Dentry, error) {
fs := &filesystem{}
- fs.Filesystem.Init(vfsObj)
+ fs.Filesystem.Init(vfsObj, &fsType)
k := kernel.KernelFromContext(ctx)
maxCPUCores := k.ApplicationCores()
defaultSysDirMode := linux.FileMode(0755)
diff --git a/pkg/sentry/fsimpl/tmpfs/tmpfs.go b/pkg/sentry/fsimpl/tmpfs/tmpfs.go
index 2f9e6c876..b07b0dbae 100644
--- a/pkg/sentry/fsimpl/tmpfs/tmpfs.go
+++ b/pkg/sentry/fsimpl/tmpfs/tmpfs.go
@@ -63,6 +63,11 @@ type filesystem struct {
nextInoMinusOne uint64 // accessed using atomic memory operations
}
+// Name implements vfs.FilesystemType.Name.
+func (FilesystemType) Name() string {
+ return Name
+}
+
// GetFilesystem implements vfs.FilesystemType.GetFilesystem.
func (fstype FilesystemType) GetFilesystem(ctx context.Context, vfsObj *vfs.VirtualFilesystem, creds *auth.Credentials, source string, opts vfs.GetFilesystemOptions) (*vfs.Filesystem, *vfs.Dentry, error) {
memFileProvider := pgalloc.MemoryFileProviderFromContext(ctx)
@@ -74,7 +79,7 @@ func (fstype FilesystemType) GetFilesystem(ctx context.Context, vfsObj *vfs.Virt
memFile: memFileProvider.MemoryFile(),
clock: clock,
}
- fs.vfsfs.Init(vfsObj, &fs)
+ fs.vfsfs.Init(vfsObj, &fstype, &fs)
root := fs.newDentry(fs.newDirectory(creds, 01777))
return &fs.vfsfs, &root.vfsd, nil
}
diff --git a/pkg/sentry/vfs/anonfs.go b/pkg/sentry/vfs/anonfs.go
index f58867066..d1f6dfb45 100644
--- a/pkg/sentry/vfs/anonfs.go
+++ b/pkg/sentry/vfs/anonfs.go
@@ -51,6 +51,19 @@ const (
anonFileGID = auth.RootKGID
)
+// anonFilesystemType implements FilesystemType.
+type anonFilesystemType struct{}
+
+// GetFilesystem implements FilesystemType.GetFilesystem.
+func (anonFilesystemType) GetFilesystem(context.Context, *VirtualFilesystem, *auth.Credentials, string, GetFilesystemOptions) (*Filesystem, *Dentry, error) {
+ panic("cannot instaniate an anon filesystem")
+}
+
+// Name implemenents FilesystemType.Name.
+func (anonFilesystemType) Name() string {
+ return "none"
+}
+
// anonFilesystem is the implementation of FilesystemImpl that backs
// VirtualDentries returned by VirtualFilesystem.NewAnonVirtualDentry().
//
diff --git a/pkg/sentry/vfs/filesystem.go b/pkg/sentry/vfs/filesystem.go
index 7b7d233f9..cd34782ff 100644
--- a/pkg/sentry/vfs/filesystem.go
+++ b/pkg/sentry/vfs/filesystem.go
@@ -42,21 +42,30 @@ type Filesystem struct {
// immutable.
vfs *VirtualFilesystem
+ // fsType is the FilesystemType of this Filesystem.
+ fsType FilesystemType
+
// impl is the FilesystemImpl associated with this Filesystem. impl is
// immutable. This should be the last field in Dentry.
impl FilesystemImpl
}
// Init must be called before first use of fs.
-func (fs *Filesystem) Init(vfsObj *VirtualFilesystem, impl FilesystemImpl) {
+func (fs *Filesystem) Init(vfsObj *VirtualFilesystem, fsType FilesystemType, impl FilesystemImpl) {
fs.refs = 1
fs.vfs = vfsObj
+ fs.fsType = fsType
fs.impl = impl
vfsObj.filesystemsMu.Lock()
vfsObj.filesystems[fs] = struct{}{}
vfsObj.filesystemsMu.Unlock()
}
+// FilesystemType returns the FilesystemType for this Filesystem.
+func (fs *Filesystem) FilesystemType() FilesystemType {
+ return fs.fsType
+}
+
// VirtualFilesystem returns the containing VirtualFilesystem.
func (fs *Filesystem) VirtualFilesystem() *VirtualFilesystem {
return fs.vfs
diff --git a/pkg/sentry/vfs/filesystem_type.go b/pkg/sentry/vfs/filesystem_type.go
index bb9cada81..f2298f7f6 100644
--- a/pkg/sentry/vfs/filesystem_type.go
+++ b/pkg/sentry/vfs/filesystem_type.go
@@ -30,6 +30,9 @@ type FilesystemType interface {
// along with its mount root. A reference is taken on the returned
// Filesystem and Dentry.
GetFilesystem(ctx context.Context, vfsObj *VirtualFilesystem, creds *auth.Credentials, source string, opts GetFilesystemOptions) (*Filesystem, *Dentry, error)
+
+ // Name returns the name of this FilesystemType.
+ Name() string
}
// GetFilesystemOptions contains options to FilesystemType.GetFilesystem.
diff --git a/pkg/sentry/vfs/vfs.go b/pkg/sentry/vfs/vfs.go
index 1708c1a53..720b90d8f 100644
--- a/pkg/sentry/vfs/vfs.go
+++ b/pkg/sentry/vfs/vfs.go
@@ -134,7 +134,7 @@ func (vfs *VirtualFilesystem) Init() error {
anonfs := anonFilesystem{
devMinor: anonfsDevMinor,
}
- anonfs.vfsfs.Init(vfs, &anonfs)
+ anonfs.vfsfs.Init(vfs, &anonFilesystemType{}, &anonfs)
defer anonfs.vfsfs.DecRef()
anonMount, err := vfs.NewDisconnectedMount(&anonfs.vfsfs, nil, &MountOptions{})
if err != nil {
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-02 18:21:32 +0000