ext: boilerplate code.

Renamed ext4 to ext since we are targeting ext(2/3/4).
Removed fs.go since we are targeting VFS2.
Added ext.go with filesystem struct.

PiperOrigin-RevId: 257689775

1 files changed, 0 insertions, 96 deletions

diff --git a/pkg/sentry/fs/ext4/disklayout/inode_new.go b/pkg/sentry/fs/ext4/disklayout/inode_new.go
deleted file mode 100644
index 4f5348372..000000000
--- a/pkg/sentry/fs/ext4/disklayout/inode_new.go
+++ /dev/null
@@ -1,96 +0,0 @@
-// Copyright 2019 The gVisor Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package disklayout
-
-import "gvisor.dev/gvisor/pkg/sentry/kernel/time"
-
-// InodeNew represents ext4 inode structure which can be bigger than
-// OldInodeSize. The actual size of this struct should be determined using
-// inode.ExtraInodeSize. Accessing any field here should be verified with the
-// actual size. The extra space between the end of the inode struct and end of
-// the inode record can be used to store extended attr.
-//
-// If the TimeExtra fields are in scope, the lower 2 bits of those are used
-// to extend their counter part to be 34 bits wide; the rest (upper) 30 bits
-// are used to provide nanoscond precision. Hence, these timestamps will now
-// overflow in May 2446.
-// See https://www.kernel.org/doc/html/latest/filesystems/ext4/dynamic.html#inode-timestamps.
-type InodeNew struct {
-	InodeOld
-
-	ExtraInodeSize        uint16
-	ChecksumHi            uint16
-	ChangeTimeExtra       uint32
-	ModificationTimeExtra uint32
-	AccessTimeExtra       uint32
-	CreationTime          uint32
-	CreationTimeExtra     uint32
-	VersionHi             uint32
-	ProjectID             uint32
-}
-
-// Compiles only if InodeNew implements Inode.
-var _ Inode = (*InodeNew)(nil)
-
-// fromExtraTime decodes the extra time and constructs the kernel time struct
-// with nanosecond precision.
-func fromExtraTime(lo int32, extra uint32) time.Time {
-	// See description above InodeNew for format.
-	seconds := (int64(extra&0x3) << 32) + int64(lo)
-	nanoseconds := int64(extra >> 2)
-	return time.FromUnix(seconds, nanoseconds)
-}
-
-// Only override methods which change due to ext4 specific fields.
-
-// Size implements Inode.Size.
-func (in *InodeNew) Size() uint64 {
-	return (uint64(in.SizeHi) << 32) | uint64(in.SizeLo)
-}
-
-// InodeSize implements Inode.InodeSize.
-func (in *InodeNew) InodeSize() uint16 {
-	return oldInodeSize + in.ExtraInodeSize
-}
-
-// ChangeTime implements Inode.ChangeTime.
-func (in *InodeNew) ChangeTime() time.Time {
-	// Apply new timestamp logic if inode.ChangeTimeExtra is in scope.
-	if in.ExtraInodeSize >= 8 {
-		return fromExtraTime(in.ChangeTimeRaw, in.ChangeTimeExtra)
-	}
-
-	return in.InodeOld.ChangeTime()
-}
-
-// ModificationTime implements Inode.ModificationTime.
-func (in *InodeNew) ModificationTime() time.Time {
-	// Apply new timestamp logic if inode.ModificationTimeExtra is in scope.
-	if in.ExtraInodeSize >= 12 {
-		return fromExtraTime(in.ModificationTimeRaw, in.ModificationTimeExtra)
-	}
-
-	return in.InodeOld.ModificationTime()
-}
-
-// AccessTime implements Inode.AccessTime.
-func (in *InodeNew) AccessTime() time.Time {
-	// Apply new timestamp logic if inode.AccessTimeExtra is in scope.
-	if in.ExtraInodeSize >= 16 {
-		return fromExtraTime(in.AccessTimeRaw, in.AccessTimeExtra)
-	}
-
-	return in.InodeOld.AccessTime()
-}