1 files changed, 0 insertions, 139 deletions
diff --git a/pkg/sentry/fs/ext/disklayout/extent.go b/pkg/sentry/fs/ext/disklayout/extent.go
deleted file mode 100644
index 567523d32..000000000
--- a/pkg/sentry/fs/ext/disklayout/extent.go
+++ /dev/null
@@ -1,139 +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
-
-// Extents were introduced in ext4 and provide huge performance gains in terms
-// data locality and reduced metadata block usage. Extents are organized in
-// extent trees. The root node is contained in inode.BlocksRaw.
-//
-// Terminology:
-//   - Physical Block:
-//       Filesystem data block which is addressed normally wrt the entire
-//       filesystem (addressed with 48 bits).
-//
-//   - File Block:
-//       Data block containing *only* file data and addressed wrt to the file
-//       with only 32 bits. The (i)th file block contains file data from
-//       byte (i * sb.BlockSize()) to ((i+1) * sb.BlockSize()).
-
-const (
-	// ExtentStructsSize is the size of all the three extent on-disk structs.
-	ExtentStructsSize = 12
-
-	// ExtentMagic is the magic number which must be present in the header.
-	ExtentMagic = 0xf30a
-)
-
-// ExtentEntryPair couples an in-memory ExtendNode with the ExtentEntry that
-// points to it. We want to cache these structs in memory to avoid repeated
-// disk reads.
-//
-// Note: This struct itself does not represent an on-disk struct.
-type ExtentEntryPair struct {
-	// Entry points to the child node on disk.
-	Entry ExtentEntry
-	// Node points to child node in memory. Is nil if the current node is a leaf.
-	Node *ExtentNode
-}
-
-// ExtentNode represents an extent tree node. For internal nodes, all Entries
-// will be ExtendIdxs. For leaf nodes, they will all be Extents.
-//
-// Note: This struct itself does not represent an on-disk struct.
-type ExtentNode struct {
-	Header  ExtentHeader
-	Entries []ExtentEntryPair
-}
-
-// ExtentEntry reprsents an extent tree node entry. The entry can either be
-// an ExtentIdx or Extent itself. This exists to simplify navigation logic.
-type ExtentEntry interface {
-	// FileBlock returns the first file block number covered by this entry.
-	FileBlock() uint32
-
-	// PhysicalBlock returns the child physical block that this entry points to.
-	PhysicalBlock() uint64
-}
-
-// ExtentHeader emulates the ext4_extent_header struct in ext4. Each extent
-// tree node begins with this and is followed by `NumEntries` number of:
-//   - Extent         if `Depth` == 0
-//   - ExtentIdx      otherwise
-type ExtentHeader struct {
-	// Magic in the extent magic number, must be 0xf30a.
-	Magic uint16
-
-	// NumEntries indicates the number of valid entries following the header.
-	NumEntries uint16
-
-	// MaxEntries that could follow the header. Used while adding entries.
-	MaxEntries uint16
-
-	// Height represents the distance of this node from the farthest leaf. Please
-	// note that Linux incorrectly calls this `Depth` (which means the distance
-	// of the node from the root).
-	Height uint16
-	_      uint32
-}
-
-// ExtentIdx emulates the ext4_extent_idx struct in ext4. Only present in
-// internal nodes. Sorted in ascending order based on FirstFileBlock since
-// Linux does a binary search on this. This points to a block containing the
-// child node.
-type ExtentIdx struct {
-	FirstFileBlock uint32
-	ChildBlockLo   uint32
-	ChildBlockHi   uint16
-	_              uint16
-}
-
-// Compiles only if ExtentIdx implements ExtentEntry.
-var _ ExtentEntry = (*ExtentIdx)(nil)
-
-// FileBlock implements ExtentEntry.FileBlock.
-func (ei *ExtentIdx) FileBlock() uint32 {
-	return ei.FirstFileBlock
-}
-
-// PhysicalBlock implements ExtentEntry.PhysicalBlock. It returns the
-// physical block number of the child block.
-func (ei *ExtentIdx) PhysicalBlock() uint64 {
-	return (uint64(ei.ChildBlockHi) << 32) | uint64(ei.ChildBlockLo)
-}
-
-// Extent represents the ext4_extent struct in ext4. Only present in leaf
-// nodes. Sorted in ascending order based on FirstFileBlock since Linux does a
-// binary search on this. This points to an array of data blocks containing the
-// file data. It covers `Length` data blocks starting from `StartBlock`.
-type Extent struct {
-	FirstFileBlock uint32
-	Length         uint16
-	StartBlockHi   uint16
-	StartBlockLo   uint32
-}
-
-// Compiles only if Extent implements ExtentEntry.
-var _ ExtentEntry = (*Extent)(nil)
-
-// FileBlock implements ExtentEntry.FileBlock.
-func (e *Extent) FileBlock() uint32 {
-	return e.FirstFileBlock
-}
-
-// PhysicalBlock implements ExtentEntry.PhysicalBlock. It returns the
-// physical block number of the first data block this extent covers.
-func (e *Extent) PhysicalBlock() uint64 {
-	return (uint64(e.StartBlockHi) << 32) | uint64(e.StartBlockLo)
-}