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authorgVisor bot <gvisor-bot@google.com>2019-06-11 22:02:41 +0000
committergVisor bot <gvisor-bot@google.com>2019-06-11 22:02:41 +0000
commit8fdc4dc78ce6e1b1abb50819beb6d874a80ce0da (patch)
tree1aa4ce30068cefd0060b9ad25bfa09c49553431b /pkg/sentry
parentcec05f7aae67555a87d5ff2c1e55f5a061247712 (diff)
parentfc746efa9ad57a5001a6328c52622adafa1d3ffe (diff)
Merge fc746efa (automated)
Diffstat (limited to 'pkg/sentry')
-rw-r--r--pkg/sentry/fs/tmpfs/fs.go25
-rwxr-xr-xpkg/sentry/kernel/seqatomic_taskgoroutineschedinfo.go4
-rwxr-xr-xpkg/sentry/platform/ring0/defs_impl.go4
-rwxr-xr-xpkg/sentry/time/seqatomic_parameters.go4
4 files changed, 28 insertions, 9 deletions
diff --git a/pkg/sentry/fs/tmpfs/fs.go b/pkg/sentry/fs/tmpfs/fs.go
index b7c29a4d1..83e1bf247 100644
--- a/pkg/sentry/fs/tmpfs/fs.go
+++ b/pkg/sentry/fs/tmpfs/fs.go
@@ -34,6 +34,16 @@ const (
// GID for the root directory.
rootGIDKey = "gid"
+ // cacheKey sets the caching policy for the mount.
+ cacheKey = "cache"
+
+ // cacheAll uses the virtual file system cache for everything (default).
+ cacheAll = "cache"
+
+ // cacheRevalidate allows dirents to be cached, but revalidates them on each
+ // lookup.
+ cacheRevalidate = "revalidate"
+
// TODO(edahlgren/mpratt): support a tmpfs size limit.
// size = "size"
@@ -122,15 +132,24 @@ func (f *Filesystem) Mount(ctx context.Context, device string, flags fs.MountSou
delete(options, rootGIDKey)
}
+ // Construct a mount which will follow the cache options provided.
+ var msrc *fs.MountSource
+ switch options[cacheKey] {
+ case "", cacheAll:
+ msrc = fs.NewCachingMountSource(f, flags)
+ case cacheRevalidate:
+ msrc = fs.NewRevalidatingMountSource(f, flags)
+ default:
+ return nil, fmt.Errorf("invalid cache policy option %q", options[cacheKey])
+ }
+ delete(options, cacheKey)
+
// Fail if the caller passed us more options than we can parse. They may be
// expecting us to set something we can't set.
if len(options) > 0 {
return nil, fmt.Errorf("unsupported mount options: %v", options)
}
- // Construct a mount which will cache dirents.
- msrc := fs.NewCachingMountSource(f, flags)
-
// Construct the tmpfs root.
return NewDir(ctx, nil, owner, perms, msrc), nil
}
diff --git a/pkg/sentry/kernel/seqatomic_taskgoroutineschedinfo.go b/pkg/sentry/kernel/seqatomic_taskgoroutineschedinfo.go
index 580fd9d86..5b4ad3062 100755
--- a/pkg/sentry/kernel/seqatomic_taskgoroutineschedinfo.go
+++ b/pkg/sentry/kernel/seqatomic_taskgoroutineschedinfo.go
@@ -1,12 +1,12 @@
package kernel
import (
+ "fmt"
+ "reflect"
"strings"
"unsafe"
- "fmt"
"gvisor.googlesource.com/gvisor/third_party/gvsync"
- "reflect"
)
// SeqAtomicLoad returns a copy of *ptr, ensuring that the read does not race
diff --git a/pkg/sentry/platform/ring0/defs_impl.go b/pkg/sentry/platform/ring0/defs_impl.go
index 582553bc7..2fcc15f50 100755
--- a/pkg/sentry/platform/ring0/defs_impl.go
+++ b/pkg/sentry/platform/ring0/defs_impl.go
@@ -1,14 +1,14 @@
package ring0
import (
+ "gvisor.googlesource.com/gvisor/pkg/cpuid"
+ "reflect"
"syscall"
"fmt"
- "gvisor.googlesource.com/gvisor/pkg/cpuid"
"gvisor.googlesource.com/gvisor/pkg/sentry/platform/ring0/pagetables"
"gvisor.googlesource.com/gvisor/pkg/sentry/usermem"
"io"
- "reflect"
)
var (
diff --git a/pkg/sentry/time/seqatomic_parameters.go b/pkg/sentry/time/seqatomic_parameters.go
index 24d6db1c6..54152a39a 100755
--- a/pkg/sentry/time/seqatomic_parameters.go
+++ b/pkg/sentry/time/seqatomic_parameters.go
@@ -1,12 +1,12 @@
package time
import (
+ "fmt"
+ "reflect"
"strings"
"unsafe"
- "fmt"
"gvisor.googlesource.com/gvisor/third_party/gvsync"
- "reflect"
)
// SeqAtomicLoad returns a copy of *ptr, ensuring that the read does not race