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-.. SPDX-License-Identifier: GPL-2.0
-
-Checksums
----------
-
-Starting in early 2012, metadata checksums were added to all major ext4
-and jbd2 data structures. The associated feature flag is metadata\_csum.
-The desired checksum algorithm is indicated in the superblock, though as
-of October 2012 the only supported algorithm is crc32c. Some data
-structures did not have space to fit a full 32-bit checksum, so only the
-lower 16 bits are stored. Enabling the 64bit feature increases the data
-structure size so that full 32-bit checksums can be stored for many data
-structures. However, existing 32-bit filesystems cannot be extended to
-enable 64bit mode, at least not without the experimental resize2fs
-patches to do so.
-
-Existing filesystems can have checksumming added by running
-``tune2fs -O metadata_csum`` against the underlying device. If tune2fs
-encounters directory blocks that lack sufficient empty space to add a
-checksum, it will request that you run ``e2fsck -D`` to have the
-directories rebuilt with checksums. This has the added benefit of
-removing slack space from the directory files and rebalancing the htree
-indexes. If you \_ignore\_ this step, your directories will not be
-protected by a checksum!
-
-The following table describes the data elements that go into each type
-of checksum. The checksum function is whatever the superblock describes
-(crc32c as of October 2013) unless noted otherwise.
-
-.. list-table::
-   :widths: 1 1 4
-   :header-rows: 1
-
-   * - Metadata
-     - Length
-     - Ingredients
-   * - Superblock
-     - \_\_le32
-     - The entire superblock up to the checksum field. The UUID lives inside
-       the superblock.
-   * - MMP
-     - \_\_le32
-     - UUID + the entire MMP block up to the checksum field.
-   * - Extended Attributes
-     - \_\_le32
-     - UUID + the entire extended attribute block. The checksum field is set to
-       zero.
-   * - Directory Entries
-     - \_\_le32
-     - UUID + inode number + inode generation + the directory block up to the
-       fake entry enclosing the checksum field.
-   * - HTREE Nodes
-     - \_\_le32
-     - UUID + inode number + inode generation + all valid extents + HTREE tail.
-       The checksum field is set to zero.
-   * - Extents
-     - \_\_le32
-     - UUID + inode number + inode generation + the entire extent block up to
-       the checksum field.
-   * - Bitmaps
-     - \_\_le32 or \_\_le16
-     - UUID + the entire bitmap. Checksums are stored in the group descriptor,
-       and truncated if the group descriptor size is 32 bytes (i.e. ^64bit)
-   * - Inodes
-     - \_\_le32
-     - UUID + inode number + inode generation + the entire inode. The checksum
-       field is set to zero. Each inode has its own checksum.
-   * - Group Descriptors
-     - \_\_le16
-     - If metadata\_csum, then UUID + group number + the entire descriptor;
-       else if gdt\_csum, then crc16(UUID + group number + the entire
-       descriptor). In all cases, only the lower 16 bits are stored.
-