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docs: add new ext4 superblock time extension fields

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The superblock timestamp fields were enlarged by u8 to be 40 bits wide.
Update the documentation to reflect this.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Darrick J. Wong 2018-07-29 16:16:21 -04:00 committed by Theodore Ts'o
parent 6684874af0
commit f5cb282d8b
1 changed files with 29 additions and 1 deletions
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30
Documentation/filesystems/ext4/ondisk/super.rst
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@ -442,8 +442,36 @@ The ext4 superblock is laid out as follows in
- Checksum seed used for metadata\_csum calculations. This value is
crc32c(~0, $orig\_fs\_uuid).
* - 0x274
- \_\_u8
- s\_wtime_hi
- Upper 8 bits of the s_wtime field.
* - 0x275
- \_\_u8
- s\_wtime_hi
- Upper 8 bits of the s_mtime field.
* - 0x276
- \_\_u8
- s\_mkfs_time_hi
- Upper 8 bits of the s_mkfs_time field.
* - 0x277
- \_\_u8
- s\_lastcheck_hi
- Upper 8 bits of the s_lastcheck_hi field.
* - 0x278
- \_\_u8
- s\_first_error_time_hi
- Upper 8 bits of the s_first_error_time_hi field.
* - 0x279
- \_\_u8
- s\_last_error_time_hi
- Upper 8 bits of the s_last_error_time_hi field.
* - 0x27A
- \_\_u8[2]
- s\_pad
- Zero padding.
* - 0x27C
- \_\_le32
- s\_reserved[98]
- s\_reserved[96]
- Padding to the end of the block.
* - 0x3FC
- \_\_le32