Merge release-20200818.0-38-gc61f6fcf6 (automated)

5 files changed, 40 insertions, 14 deletions

diff --git a/pkg/sentry/fsimpl/gofer/regular_file.go b/pkg/sentry/fsimpl/gofer/regular_file.go
index 3b5462682..a2e9342d5 100644
--- a/pkg/sentry/fsimpl/gofer/regular_file.go
+++ b/pkg/sentry/fsimpl/gofer/regular_file.go
@@ -123,6 +123,10 @@ func (fd *regularFileFD) PRead(ctx context.Context, dst usermem.IOSequence, offs
 		return 0, io.EOF
 	}
 
+	var (
+		n       int64
+		readErr error
+	)
 	if fd.vfsfd.StatusFlags()&linux.O_DIRECT != 0 {
 		// Lock d.metadataMu for the rest of the read to prevent d.size from
 		// changing.
@@ -133,20 +137,25 @@ func (fd *regularFileFD) PRead(ctx context.Context, dst usermem.IOSequence, offs
 		if err := d.writeback(ctx, offset, dst.NumBytes()); err != nil {
 			return 0, err
 		}
-	}
-
-	rw := getDentryReadWriter(ctx, d, offset)
-	if fd.vfsfd.StatusFlags()&linux.O_DIRECT != 0 {
+		rw := getDentryReadWriter(ctx, d, offset)
 		// Require the read to go to the remote file.
 		rw.direct = true
+		n, readErr = dst.CopyOutFrom(ctx, rw)
+		putDentryReadWriter(rw)
+		if d.fs.opts.interop != InteropModeShared {
+			// Compare Linux's mm/filemap.c:do_generic_file_read() => file_accessed().
+			d.touchAtimeLocked(fd.vfsfd.Mount())
+		}
+	} else {
+		rw := getDentryReadWriter(ctx, d, offset)
+		n, readErr = dst.CopyOutFrom(ctx, rw)
+		putDentryReadWriter(rw)
+		if d.fs.opts.interop != InteropModeShared {
+			// Compare Linux's mm/filemap.c:do_generic_file_read() => file_accessed().
+			d.touchAtime(fd.vfsfd.Mount())
+		}
 	}
-	n, err := dst.CopyOutFrom(ctx, rw)
-	putDentryReadWriter(rw)
-	if d.fs.opts.interop != InteropModeShared {
-		// Compare Linux's mm/filemap.c:do_generic_file_read() => file_accessed().
-		d.touchAtime(fd.vfsfd.Mount())
-	}
-	return n, err
+	return n, readErr
 }
 
 // Read implements vfs.FileDescriptionImpl.Read.
diff --git a/pkg/sentry/fsimpl/gofer/time.go b/pkg/sentry/fsimpl/gofer/time.go
index 98733253d..7e825caae 100644
--- a/pkg/sentry/fsimpl/gofer/time.go
+++ b/pkg/sentry/fsimpl/gofer/time.go
@@ -52,6 +52,20 @@ func (d *dentry) touchAtime(mnt *vfs.Mount) {
 	mnt.EndWrite()
 }
 
+// Preconditions: d.metadataMu is locked. d.cachedMetadataAuthoritative() == true.
+func (d *dentry) touchAtimeLocked(mnt *vfs.Mount) {
+	if mnt.Flags.NoATime || mnt.ReadOnly() {
+		return
+	}
+	if err := mnt.CheckBeginWrite(); err != nil {
+		return
+	}
+	now := d.fs.clock.Now().Nanoseconds()
+	atomic.StoreInt64(&d.atime, now)
+	atomic.StoreUint32(&d.atimeDirty, 1)
+	mnt.EndWrite()
+}
+
 // Preconditions:
 // * d.cachedMetadataAuthoritative() == true.
 // * The caller has successfully called vfs.Mount.CheckBeginWrite().
diff --git a/pkg/sentry/fsimpl/host/connected_endpoint_refs.go b/pkg/sentry/fsimpl/host/connected_endpoint_refs.go
index 1fcf8ab73..1f13a2608 100644
--- a/pkg/sentry/fsimpl/host/connected_endpoint_refs.go
+++ b/pkg/sentry/fsimpl/host/connected_endpoint_refs.go
@@ -1,10 +1,11 @@
 package host
 
 import (
+	"sync/atomic"
+
 	"gvisor.dev/gvisor/pkg/log"
 	refs_vfs1 "gvisor.dev/gvisor/pkg/refs"
 	"runtime"
-	"sync/atomic"
 )
 
 // ownerType is used to customize logging. Note that we use a pointer to T so
diff --git a/pkg/sentry/fsimpl/host/inode_refs.go b/pkg/sentry/fsimpl/host/inode_refs.go
index c920a3c4e..2c67758a0 100644
--- a/pkg/sentry/fsimpl/host/inode_refs.go
+++ b/pkg/sentry/fsimpl/host/inode_refs.go
@@ -1,10 +1,11 @@
 package host
 
 import (
+	"sync/atomic"
+
 	"gvisor.dev/gvisor/pkg/log"
 	refs_vfs1 "gvisor.dev/gvisor/pkg/refs"
 	"runtime"
-	"sync/atomic"
 )
 
 // ownerType is used to customize logging. Note that we use a pointer to T so
diff --git a/pkg/sentry/fsimpl/tmpfs/inode_refs.go b/pkg/sentry/fsimpl/tmpfs/inode_refs.go
index 38eddde7e..3245ede1f 100644
--- a/pkg/sentry/fsimpl/tmpfs/inode_refs.go
+++ b/pkg/sentry/fsimpl/tmpfs/inode_refs.go
@@ -1,10 +1,11 @@
 package tmpfs
 
 import (
+	"sync/atomic"
+
 	"gvisor.dev/gvisor/pkg/log"
 	refs_vfs1 "gvisor.dev/gvisor/pkg/refs"
 	"runtime"
-	"sync/atomic"
 )
 
 // ownerType is used to customize logging. Note that we use a pointer to T so