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-rw-r--r--runsc/boot/fs.go62
-rw-r--r--runsc/boot/vfs.go87
2 files changed, 50 insertions, 99 deletions
diff --git a/runsc/boot/fs.go b/runsc/boot/fs.go
index 4875452e2..8df5cc989 100644
--- a/runsc/boot/fs.go
+++ b/runsc/boot/fs.go
@@ -37,6 +37,12 @@ import (
"gvisor.dev/gvisor/pkg/sentry/fs"
"gvisor.dev/gvisor/pkg/sentry/fs/gofer"
"gvisor.dev/gvisor/pkg/sentry/fs/ramfs"
+ "gvisor.dev/gvisor/pkg/sentry/fsimpl/devpts"
+ "gvisor.dev/gvisor/pkg/sentry/fsimpl/devtmpfs"
+ gofervfs2 "gvisor.dev/gvisor/pkg/sentry/fsimpl/gofer"
+ procvfs2 "gvisor.dev/gvisor/pkg/sentry/fsimpl/proc"
+ sysvfs2 "gvisor.dev/gvisor/pkg/sentry/fsimpl/sys"
+ tmpfsvfs2 "gvisor.dev/gvisor/pkg/sentry/fsimpl/tmpfs"
"gvisor.dev/gvisor/pkg/sentry/kernel"
"gvisor.dev/gvisor/pkg/sentry/kernel/auth"
"gvisor.dev/gvisor/pkg/syserror"
@@ -44,23 +50,15 @@ import (
)
const (
- // Filesystem name for 9p gofer mounts.
- rootFsName = "9p"
-
// Device name for root mount.
rootDevice = "9pfs-/"
// MountPrefix is the annotation prefix for mount hints.
MountPrefix = "dev.gvisor.spec.mount."
- // Filesystems that runsc supports.
- bind = "bind"
- devpts = "devpts"
- devtmpfs = "devtmpfs"
- proc = "proc"
- sysfs = "sysfs"
- tmpfs = "tmpfs"
- nonefs = "none"
+ // Supported filesystems that map to different internal filesystem.
+ bind = "bind"
+ nonefs = "none"
)
// tmpfs has some extra supported options that we must pass through.
@@ -108,12 +106,12 @@ func compileMounts(spec *specs.Spec) []specs.Mount {
// Always mount /dev.
mounts = append(mounts, specs.Mount{
- Type: devtmpfs,
+ Type: devtmpfs.Name,
Destination: "/dev",
})
mounts = append(mounts, specs.Mount{
- Type: devpts,
+ Type: devpts.Name,
Destination: "/dev/pts",
})
@@ -137,13 +135,13 @@ func compileMounts(spec *specs.Spec) []specs.Mount {
var mandatoryMounts []specs.Mount
if !procMounted {
mandatoryMounts = append(mandatoryMounts, specs.Mount{
- Type: proc,
+ Type: procvfs2.Name,
Destination: "/proc",
})
}
if !sysMounted {
mandatoryMounts = append(mandatoryMounts, specs.Mount{
- Type: sysfs,
+ Type: sysvfs2.Name,
Destination: "/sys",
})
}
@@ -156,12 +154,16 @@ func compileMounts(spec *specs.Spec) []specs.Mount {
}
// p9MountOptions creates a slice of options for a p9 mount.
-func p9MountOptions(fd int, fa FileAccessType) []string {
+func p9MountOptions(fd int, fa FileAccessType, vfs2 bool) []string {
opts := []string{
"trans=fd",
"rfdno=" + strconv.Itoa(fd),
"wfdno=" + strconv.Itoa(fd),
- "privateunixsocket=true",
+ }
+ if !vfs2 {
+ // privateunixsocket is always enabled in VFS2. VFS1 requires explicit
+ // enablement.
+ opts = append(opts, "privateunixsocket=true")
}
if fa == FileAccessShared {
opts = append(opts, "cache=remote_revalidating")
@@ -234,7 +236,7 @@ func isSupportedMountFlag(fstype, opt string) bool {
case "rw", "ro", "noatime", "noexec":
return true
}
- if fstype == tmpfs {
+ if fstype == tmpfsvfs2.Name {
ok, err := parseMountOption(opt, tmpfsAllowedOptions...)
return ok && err == nil
}
@@ -444,7 +446,7 @@ func (m *mountHint) setOptions(val string) error {
}
func (m *mountHint) isSupported() bool {
- return m.mount.Type == tmpfs && m.share == pod
+ return m.mount.Type == tmpfsvfs2.Name && m.share == pod
}
// checkCompatible verifies that shared mount is compatible with master.
@@ -586,7 +588,7 @@ func (c *containerMounter) processHints(conf *Config) error {
for _, hint := range c.hints.mounts {
// TODO(b/142076984): Only support tmpfs for now. Bind mounts require a
// common gofer to mount all shared volumes.
- if hint.mount.Type != tmpfs {
+ if hint.mount.Type != tmpfsvfs2.Name {
continue
}
log.Infof("Mounting master of shared mount %q from %q type %q", hint.name, hint.mount.Source, hint.mount.Type)
@@ -723,7 +725,7 @@ func (c *containerMounter) createRootMount(ctx context.Context, conf *Config) (*
fd := c.fds.remove()
log.Infof("Mounting root over 9P, ioFD: %d", fd)
p9FS := mustFindFilesystem("9p")
- opts := p9MountOptions(fd, conf.FileAccess)
+ opts := p9MountOptions(fd, conf.FileAccess, false /* vfs2 */)
if conf.OverlayfsStaleRead {
// We can't check for overlayfs here because sandbox is chroot'ed and gofer
@@ -779,11 +781,11 @@ func (c *containerMounter) getMountNameAndOptions(conf *Config, m specs.Mount) (
}
switch m.Type {
- case devpts, devtmpfs, proc, sysfs:
+ case devpts.Name, devtmpfs.Name, procvfs2.Name, sysvfs2.Name:
fsName = m.Type
case nonefs:
- fsName = sysfs
- case tmpfs:
+ fsName = sysvfs2.Name
+ case tmpfsvfs2.Name:
fsName = m.Type
var err error
@@ -794,8 +796,8 @@ func (c *containerMounter) getMountNameAndOptions(conf *Config, m specs.Mount) (
case bind:
fd := c.fds.remove()
- fsName = "9p"
- opts = p9MountOptions(fd, c.getMountAccessType(m))
+ fsName = gofervfs2.Name
+ opts = p9MountOptions(fd, c.getMountAccessType(m), conf.VFS2)
// If configured, add overlay to all writable mounts.
useOverlay = conf.Overlay && !mountFlags(m.Options).ReadOnly
@@ -948,7 +950,7 @@ func (c *containerMounter) createRestoreEnvironment(conf *Config) (*fs.RestoreEn
// Add root mount.
fd := c.fds.remove()
- opts := p9MountOptions(fd, conf.FileAccess)
+ opts := p9MountOptions(fd, conf.FileAccess, false /* vfs2 */)
mf := fs.MountSourceFlags{}
if c.root.Readonly || conf.Overlay {
@@ -960,7 +962,7 @@ func (c *containerMounter) createRestoreEnvironment(conf *Config) (*fs.RestoreEn
Flags: mf,
DataString: strings.Join(opts, ","),
}
- renv.MountSources[rootFsName] = append(renv.MountSources[rootFsName], rootMount)
+ renv.MountSources[gofervfs2.Name] = append(renv.MountSources[gofervfs2.Name], rootMount)
// Add submounts.
var tmpMounted bool
@@ -976,7 +978,7 @@ func (c *containerMounter) createRestoreEnvironment(conf *Config) (*fs.RestoreEn
// TODO(b/67958150): handle '/tmp' properly (see mountTmp()).
if !tmpMounted {
tmpMount := specs.Mount{
- Type: tmpfs,
+ Type: tmpfsvfs2.Name,
Destination: "/tmp",
}
if err := c.addRestoreMount(conf, renv, tmpMount); err != nil {
@@ -1032,7 +1034,7 @@ func (c *containerMounter) mountTmp(ctx context.Context, conf *Config, mns *fs.M
// No '/tmp' found (or fallthrough from above). Safe to mount internal
// tmpfs.
tmpMount := specs.Mount{
- Type: tmpfs,
+ Type: tmpfsvfs2.Name,
Destination: "/tmp",
// Sticky bit is added to prevent accidental deletion of files from
// another user. This is normally done for /tmp.
diff --git a/runsc/boot/vfs.go b/runsc/boot/vfs.go
index ef95d0c65..7378fbc95 100644
--- a/runsc/boot/vfs.go
+++ b/runsc/boot/vfs.go
@@ -18,7 +18,6 @@ import (
"fmt"
"path"
"sort"
- "strconv"
"strings"
specs "github.com/opencontainers/runtime-spec/specs-go"
@@ -26,12 +25,12 @@ import (
"gvisor.dev/gvisor/pkg/fspath"
"gvisor.dev/gvisor/pkg/sentry/devices/memdev"
"gvisor.dev/gvisor/pkg/sentry/fs"
- devpts2 "gvisor.dev/gvisor/pkg/sentry/fsimpl/devpts"
- devtmpfsimpl "gvisor.dev/gvisor/pkg/sentry/fsimpl/devtmpfs"
- goferimpl "gvisor.dev/gvisor/pkg/sentry/fsimpl/gofer"
- procimpl "gvisor.dev/gvisor/pkg/sentry/fsimpl/proc"
- sysimpl "gvisor.dev/gvisor/pkg/sentry/fsimpl/sys"
- tmpfsimpl "gvisor.dev/gvisor/pkg/sentry/fsimpl/tmpfs"
+ "gvisor.dev/gvisor/pkg/sentry/fsimpl/devpts"
+ "gvisor.dev/gvisor/pkg/sentry/fsimpl/devtmpfs"
+ "gvisor.dev/gvisor/pkg/sentry/fsimpl/gofer"
+ "gvisor.dev/gvisor/pkg/sentry/fsimpl/proc"
+ "gvisor.dev/gvisor/pkg/sentry/fsimpl/sys"
+ "gvisor.dev/gvisor/pkg/sentry/fsimpl/tmpfs"
"gvisor.dev/gvisor/pkg/syserror"
"gvisor.dev/gvisor/pkg/context"
@@ -42,28 +41,28 @@ import (
)
func registerFilesystems(ctx context.Context, vfsObj *vfs.VirtualFilesystem, creds *auth.Credentials) error {
- vfsObj.MustRegisterFilesystemType(devpts2.Name, &devpts2.FilesystemType{}, &vfs.RegisterFilesystemTypeOptions{
+ vfsObj.MustRegisterFilesystemType(devpts.Name, &devpts.FilesystemType{}, &vfs.RegisterFilesystemTypeOptions{
AllowUserList: true,
// TODO(b/29356795): Users may mount this once the terminals are in a
// usable state.
AllowUserMount: false,
})
- vfsObj.MustRegisterFilesystemType(devtmpfsimpl.Name, &devtmpfsimpl.FilesystemType{}, &vfs.RegisterFilesystemTypeOptions{
+ vfsObj.MustRegisterFilesystemType(devtmpfs.Name, &devtmpfs.FilesystemType{}, &vfs.RegisterFilesystemTypeOptions{
AllowUserMount: true,
AllowUserList: true,
})
- vfsObj.MustRegisterFilesystemType(goferimpl.Name, &goferimpl.FilesystemType{}, &vfs.RegisterFilesystemTypeOptions{
+ vfsObj.MustRegisterFilesystemType(gofer.Name, &gofer.FilesystemType{}, &vfs.RegisterFilesystemTypeOptions{
AllowUserList: true,
})
- vfsObj.MustRegisterFilesystemType(procimpl.Name, &procimpl.FilesystemType{}, &vfs.RegisterFilesystemTypeOptions{
+ vfsObj.MustRegisterFilesystemType(proc.Name, &proc.FilesystemType{}, &vfs.RegisterFilesystemTypeOptions{
AllowUserMount: true,
AllowUserList: true,
})
- vfsObj.MustRegisterFilesystemType(sysimpl.Name, &sysimpl.FilesystemType{}, &vfs.RegisterFilesystemTypeOptions{
+ vfsObj.MustRegisterFilesystemType(sys.Name, &sys.FilesystemType{}, &vfs.RegisterFilesystemTypeOptions{
AllowUserMount: true,
AllowUserList: true,
})
- vfsObj.MustRegisterFilesystemType(tmpfsimpl.Name, &tmpfsimpl.FilesystemType{}, &vfs.RegisterFilesystemTypeOptions{
+ vfsObj.MustRegisterFilesystemType(tmpfs.Name, &tmpfs.FilesystemType{}, &vfs.RegisterFilesystemTypeOptions{
AllowUserMount: true,
AllowUserList: true,
})
@@ -72,7 +71,7 @@ func registerFilesystems(ctx context.Context, vfsObj *vfs.VirtualFilesystem, cre
if err := memdev.Register(vfsObj); err != nil {
return fmt.Errorf("registering memdev: %w", err)
}
- a, err := devtmpfsimpl.NewAccessor(ctx, vfsObj, creds, devtmpfsimpl.Name)
+ a, err := devtmpfs.NewAccessor(ctx, vfsObj, creds, devtmpfs.Name)
if err != nil {
return fmt.Errorf("creating devtmpfs accessor: %w", err)
}
@@ -193,10 +192,10 @@ func (c *containerMounter) setupVFS2(ctx context.Context, conf *Config, procArgs
func (c *containerMounter) createMountNamespaceVFS2(ctx context.Context, conf *Config, creds *auth.Credentials) (*vfs.MountNamespace, error) {
fd := c.fds.remove()
- opts := strings.Join(p9MountOptionsVFS2(fd, conf.FileAccess), ",")
+ opts := strings.Join(p9MountOptions(fd, conf.FileAccess, true /* vfs2 */), ",")
log.Infof("Mounting root over 9P, ioFD: %d", fd)
- mns, err := c.k.VFS().NewMountNamespace(ctx, creds, "", rootFsName, &vfs.GetFilesystemOptions{Data: opts})
+ mns, err := c.k.VFS().NewMountNamespace(ctx, creds, "", gofer.Name, &vfs.GetFilesystemOptions{Data: opts})
if err != nil {
return nil, fmt.Errorf("setting up mount namespace: %w", err)
}
@@ -223,7 +222,8 @@ func (c *containerMounter) prepareMountsVFS2() {
sort.Slice(c.mounts, func(i, j int) bool { return len(c.mounts[i].Destination) < len(c.mounts[j].Destination) })
}
-// TODO(gvisor.dev/issue/1487): Implement submount options similar to the VFS1 version.
+// TODO(gvisor.dev/issue/1487): Implement submount options similar to the VFS1
+// version.
func (c *containerMounter) mountSubmountVFS2(ctx context.Context, conf *Config, mns *vfs.MountNamespace, creds *auth.Credentials, submount *specs.Mount) error {
root := mns.Root()
defer root.DecRef()
@@ -233,7 +233,7 @@ func (c *containerMounter) mountSubmountVFS2(ctx context.Context, conf *Config,
Path: fspath.Parse(submount.Destination),
}
- fsName, options, useOverlay, err := c.getMountNameAndOptionsVFS2(conf, *submount)
+ fsName, options, useOverlay, err := c.getMountNameAndOptions(conf, *submount)
if err != nil {
return fmt.Errorf("mountOptions failed: %w", err)
}
@@ -263,57 +263,6 @@ func (c *containerMounter) mountSubmountVFS2(ctx context.Context, conf *Config,
return nil
}
-// getMountNameAndOptionsVFS2 retrieves the fsName, opts, and useOverlay values
-// used for mounts.
-func (c *containerMounter) getMountNameAndOptionsVFS2(conf *Config, m specs.Mount) (string, []string, bool, error) {
- var (
- fsName string
- opts []string
- useOverlay bool
- )
-
- switch m.Type {
- case devpts, devtmpfs, proc, sysfs:
- fsName = m.Type
- case nonefs:
- fsName = sysfs
- case tmpfs:
- fsName = m.Type
-
- var err error
- opts, err = parseAndFilterOptions(m.Options, tmpfsAllowedOptions...)
- if err != nil {
- return "", nil, false, err
- }
-
- case bind:
- fd := c.fds.remove()
- fsName = "9p"
- opts = p9MountOptionsVFS2(fd, c.getMountAccessType(m))
- // If configured, add overlay to all writable mounts.
- useOverlay = conf.Overlay && !mountFlags(m.Options).ReadOnly
-
- default:
- log.Warningf("ignoring unknown filesystem type %q", m.Type)
- }
- return fsName, opts, useOverlay, nil
-}
-
-// p9MountOptions creates a slice of options for a p9 mount.
-// TODO(gvisor.dev/issue/1624): Remove this version once privateunixsocket is
-// deleted, along with the rest of VFS1.
-func p9MountOptionsVFS2(fd int, fa FileAccessType) []string {
- opts := []string{
- "trans=fd",
- "rfdno=" + strconv.Itoa(fd),
- "wfdno=" + strconv.Itoa(fd),
- }
- if fa == FileAccessShared {
- opts = append(opts, "cache=remote_revalidating")
- }
- return opts
-}
-
func (c *containerMounter) makeSyntheticMount(ctx context.Context, currentPath string, root vfs.VirtualDentry, creds *auth.Credentials) error {
target := &vfs.PathOperation{
Root: root,
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-01 12:34:03 +0000