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-rw-r--r--pkg/sentry/fsimpl/devpts/devpts.go2
-rw-r--r--pkg/sentry/fsimpl/host/BUILD1
-rw-r--r--pkg/sentry/fsimpl/host/host.go68
-rw-r--r--pkg/sentry/fsimpl/kernfs/kernfs.go12
-rw-r--r--pkg/sentry/fsimpl/kernfs/kernfs_test.go2
-rw-r--r--pkg/sentry/fsimpl/pipefs/pipefs.go28
-rw-r--r--pkg/sentry/fsimpl/sockfs/sockfs.go9
-rw-r--r--pkg/sentry/fsimpl/sys/sys.go2
8 files changed, 60 insertions, 64 deletions
diff --git a/pkg/sentry/fsimpl/devpts/devpts.go b/pkg/sentry/fsimpl/devpts/devpts.go
index 181d765d3..94db8fe5c 100644
--- a/pkg/sentry/fsimpl/devpts/devpts.go
+++ b/pkg/sentry/fsimpl/devpts/devpts.go
@@ -59,7 +59,7 @@ func (fstype FilesystemType) GetFilesystem(ctx context.Context, vfsObj *vfs.Virt
// master inode. It returns the filesystem and root Dentry.
func (fstype FilesystemType) newFilesystem(vfsObj *vfs.VirtualFilesystem, creds *auth.Credentials) (*kernfs.Filesystem, *kernfs.Dentry) {
fs := &kernfs.Filesystem{}
- fs.Init(vfsObj, fstype)
+ fs.VFSFilesystem().Init(vfsObj, fstype, fs)
// Construct the root directory. This is always inode id 1.
root := &rootInode{
diff --git a/pkg/sentry/fsimpl/host/BUILD b/pkg/sentry/fsimpl/host/BUILD
index e1c56d89b..39509f703 100644
--- a/pkg/sentry/fsimpl/host/BUILD
+++ b/pkg/sentry/fsimpl/host/BUILD
@@ -20,6 +20,7 @@ go_library(
"//pkg/abi/linux",
"//pkg/context",
"//pkg/fdnotifier",
+ "//pkg/fspath",
"//pkg/log",
"//pkg/refs",
"//pkg/sentry/arch",
diff --git a/pkg/sentry/fsimpl/host/host.go b/pkg/sentry/fsimpl/host/host.go
index 2be498afc..144e04905 100644
--- a/pkg/sentry/fsimpl/host/host.go
+++ b/pkg/sentry/fsimpl/host/host.go
@@ -25,6 +25,7 @@ import (
"gvisor.dev/gvisor/pkg/abi/linux"
"gvisor.dev/gvisor/pkg/context"
"gvisor.dev/gvisor/pkg/fdnotifier"
+ "gvisor.dev/gvisor/pkg/fspath"
"gvisor.dev/gvisor/pkg/log"
"gvisor.dev/gvisor/pkg/refs"
"gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs"
@@ -39,37 +40,9 @@ import (
"gvisor.dev/gvisor/pkg/waiter"
)
-// 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("host.filesystemType.GetFilesystem should never be called")
-}
-
-// Name implements FilesystemType.Name.
-func (filesystemType) Name() string {
- return "none"
-}
-
-// filesystem implements vfs.FilesystemImpl.
-type filesystem struct {
- kernfs.Filesystem
-}
-
-// NewFilesystem sets up and returns a new hostfs filesystem.
-//
-// Note that there should only ever be one instance of host.filesystem,
-// a global mount for host fds.
-func NewFilesystem(vfsObj *vfs.VirtualFilesystem) *vfs.Filesystem {
- fs := &filesystem{}
- fs.Init(vfsObj, filesystemType{})
- return fs.VFSFilesystem()
-}
-
// ImportFD sets up and returns a vfs.FileDescription from a donated fd.
func ImportFD(ctx context.Context, mnt *vfs.Mount, hostFD int, isTTY bool) (*vfs.FileDescription, error) {
- fs, ok := mnt.Filesystem().Impl().(*kernfs.Filesystem)
+ fs, ok := mnt.Filesystem().Impl().(*filesystem)
if !ok {
return nil, fmt.Errorf("can't import host FDs into filesystems of type %T", mnt.Filesystem().Impl())
}
@@ -119,12 +92,47 @@ func ImportFD(ctx context.Context, mnt *vfs.Mount, hostFD int, isTTY bool) (*vfs
d := &kernfs.Dentry{}
d.Init(i)
+
// i.open will take a reference on d.
defer d.DecRef()
-
return i.open(ctx, d.VFSDentry(), mnt)
}
+// 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("host.filesystemType.GetFilesystem should never be called")
+}
+
+// Name implements FilesystemType.Name.
+func (filesystemType) Name() string {
+ return "none"
+}
+
+// NewFilesystem sets up and returns a new hostfs filesystem.
+//
+// Note that there should only ever be one instance of host.filesystem,
+// a global mount for host fds.
+func NewFilesystem(vfsObj *vfs.VirtualFilesystem) *vfs.Filesystem {
+ fs := &filesystem{}
+ fs.VFSFilesystem().Init(vfsObj, filesystemType{}, fs)
+ return fs.VFSFilesystem()
+}
+
+// filesystem implements vfs.FilesystemImpl.
+type filesystem struct {
+ kernfs.Filesystem
+}
+
+func (fs *filesystem) PrependPath(ctx context.Context, vfsroot, vd vfs.VirtualDentry, b *fspath.Builder) error {
+ d := vd.Dentry().Impl().(*kernfs.Dentry)
+ inode := d.Inode().(*inode)
+ b.PrependComponent(fmt.Sprintf("host:[%d]", inode.ino))
+ return vfs.PrependPathSyntheticError{}
+}
+
// inode implements kernfs.Inode.
type inode struct {
kernfs.InodeNotDirectory
diff --git a/pkg/sentry/fsimpl/kernfs/kernfs.go b/pkg/sentry/fsimpl/kernfs/kernfs.go
index 732837933..a83151ad3 100644
--- a/pkg/sentry/fsimpl/kernfs/kernfs.go
+++ b/pkg/sentry/fsimpl/kernfs/kernfs.go
@@ -132,13 +132,6 @@ func (fs *Filesystem) processDeferredDecRefsLocked() {
fs.droppedDentriesMu.Unlock()
}
-// 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, fsType vfs.FilesystemType) {
- fs.vfsfs.Init(vfsObj, fsType, fs)
-}
-
// VFSFilesystem returns the generic vfs filesystem object.
func (fs *Filesystem) VFSFilesystem() *vfs.Filesystem {
return &fs.vfsfs
@@ -261,6 +254,11 @@ func (d *Dentry) insertChildLocked(name string, child *Dentry) {
d.children[name] = child
}
+// Inode returns the dentry's inode.
+func (d *Dentry) Inode() Inode {
+ return d.inode
+}
+
// The Inode interface maps filesystem-level operations that operate on paths to
// equivalent operations on specific filesystem nodes.
//
diff --git a/pkg/sentry/fsimpl/kernfs/kernfs_test.go b/pkg/sentry/fsimpl/kernfs/kernfs_test.go
index a9f671bc8..1c5d3e7e7 100644
--- a/pkg/sentry/fsimpl/kernfs/kernfs_test.go
+++ b/pkg/sentry/fsimpl/kernfs/kernfs_test.go
@@ -195,7 +195,7 @@ func (fsType) Name() string {
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, &fst)
+ fs.VFSFilesystem().Init(vfsObj, &fst, fs)
root := fst.rootFn(creds, fs)
return fs.VFSFilesystem(), root.VFSDentry(), nil
}
diff --git a/pkg/sentry/fsimpl/pipefs/pipefs.go b/pkg/sentry/fsimpl/pipefs/pipefs.go
index d6bd67467..5375e5e75 100644
--- a/pkg/sentry/fsimpl/pipefs/pipefs.go
+++ b/pkg/sentry/fsimpl/pipefs/pipefs.go
@@ -40,25 +40,19 @@ func (filesystemType) GetFilesystem(ctx context.Context, vfsObj *vfs.VirtualFile
panic("pipefs.filesystemType.GetFilesystem should never be called")
}
-// filesystem implements vfs.FilesystemImpl.
-type filesystem struct {
- kernfs.Filesystem
-
- // TODO(gvisor.dev/issue/1193):
- //
- // - kernfs does not provide a way to implement statfs, from which we
- // should indicate PIPEFS_MAGIC.
- //
- // - kernfs does not provide a way to override names for
- // vfs.FilesystemImpl.PrependPath(); pipefs inodes should use synthetic
- // name fmt.Sprintf("pipe:[%d]", inode.ino).
-}
+// TODO(gvisor.dev/issue/1193):
+//
+// - kernfs does not provide a way to implement statfs, from which we
+// should indicate PIPEFS_MAGIC.
+//
+// - kernfs does not provide a way to override names for
+// vfs.FilesystemImpl.PrependPath(); pipefs inodes should use synthetic
+// name fmt.Sprintf("pipe:[%d]", inode.ino).
-// NewFilesystem sets up and returns a new vfs.Filesystem implemented by
-// pipefs.
+// NewFilesystem sets up and returns a new vfs.Filesystem implemented by pipefs.
func NewFilesystem(vfsObj *vfs.VirtualFilesystem) *vfs.Filesystem {
- fs := &filesystem{}
- fs.Init(vfsObj, filesystemType{})
+ fs := &kernfs.Filesystem{}
+ fs.VFSFilesystem().Init(vfsObj, filesystemType{}, fs)
return fs.VFSFilesystem()
}
diff --git a/pkg/sentry/fsimpl/sockfs/sockfs.go b/pkg/sentry/fsimpl/sockfs/sockfs.go
index dac2389fc..3f085d3ca 100644
--- a/pkg/sentry/fsimpl/sockfs/sockfs.go
+++ b/pkg/sentry/fsimpl/sockfs/sockfs.go
@@ -41,18 +41,13 @@ func (filesystemType) Name() string {
return "sockfs"
}
-// filesystem implements vfs.FilesystemImpl.
-type filesystem struct {
- kernfs.Filesystem
-}
-
// NewFilesystem sets up and returns a new sockfs filesystem.
//
// Note that there should only ever be one instance of sockfs.Filesystem,
// backing a global socket mount.
func NewFilesystem(vfsObj *vfs.VirtualFilesystem) *vfs.Filesystem {
- fs := &filesystem{}
- fs.Init(vfsObj, filesystemType{})
+ fs := &kernfs.Filesystem{}
+ fs.VFSFilesystem().Init(vfsObj, filesystemType{}, fs)
return fs.VFSFilesystem()
}
diff --git a/pkg/sentry/fsimpl/sys/sys.go b/pkg/sentry/fsimpl/sys/sys.go
index f8d25d35e..00f7d6214 100644
--- a/pkg/sentry/fsimpl/sys/sys.go
+++ b/pkg/sentry/fsimpl/sys/sys.go
@@ -47,7 +47,7 @@ func (FilesystemType) Name() string {
// 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) {
fs := &filesystem{}
- fs.Filesystem.Init(vfsObj, &fsType)
+ fs.VFSFilesystem().Init(vfsObj, &fsType, fs)
k := kernel.KernelFromContext(ctx)
maxCPUCores := k.ApplicationCores()
defaultSysDirMode := linux.FileMode(0755)
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-17 13:52:07 +0000