cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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blockmap.rst (11645B)

      1.. SPDX-License-Identifier: GPL-2.0
      2
      3+---------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
      4| i.i_block Offset   | Where It Points                                                                                                                                                                                                              |
      5+=====================+==============================================================================================================================================================================================================================+
      6| 0 to 11             | Direct map to file blocks 0 to 11.                                                                                                                                                                                           |
      7+---------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
      8| 12                  | Indirect block: (file blocks 12 to (``$block_size`` / 4) + 11, or 12 to 1035 if 4KiB blocks)                                                                                                                                 |
      9|                     |                                                                                                                                                                                                                              |
     10|                     | +------------------------------+--------------------------------------------------------------------+                                                                                                                        |
     11|                     | | Indirect Block Offset        | Where It Points                                                    |                                                                                                                        |
     12|                     | +==============================+====================================================================+                                                                                                                        |
     13|                     | | 0 to (``$block_size`` / 4)   | Direct map to (``$block_size`` / 4) blocks (1024 if 4KiB blocks)   |                                                                                                                        |
     14|                     | +------------------------------+--------------------------------------------------------------------+                                                                                                                        |
     15+---------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
     16| 13                  | Double-indirect block: (file blocks ``$block_size``/4 + 12 to (``$block_size`` / 4) ^ 2 + (``$block_size`` / 4) + 11, or 1036 to 1049611 if 4KiB blocks)                                                                     |
     17|                     |                                                                                                                                                                                                                              |
     18|                     | +--------------------------------+---------------------------------------------------------------------------------------------------------+                                                                                 |
     19|                     | | Double Indirect Block Offset   | Where It Points                                                                                         |                                                                                 |
     20|                     | +================================+=========================================================================================================+                                                                                 |
     21|                     | | 0 to (``$block_size`` / 4)     | Map to (``$block_size`` / 4) indirect blocks (1024 if 4KiB blocks)                                      |                                                                                 |
     22|                     | |                                |                                                                                                         |                                                                                 |
     23|                     | |                                | +------------------------------+--------------------------------------------------------------------+   |                                                                                 |
     24|                     | |                                | | Indirect Block Offset        | Where It Points                                                    |   |                                                                                 |
     25|                     | |                                | +==============================+====================================================================+   |                                                                                 |
     26|                     | |                                | | 0 to (``$block_size`` / 4)   | Direct map to (``$block_size`` / 4) blocks (1024 if 4KiB blocks)   |   |                                                                                 |
     27|                     | |                                | +------------------------------+--------------------------------------------------------------------+   |                                                                                 |
     28|                     | +--------------------------------+---------------------------------------------------------------------------------------------------------+                                                                                 |
     29+---------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
     30| 14                  | Triple-indirect block: (file blocks (``$block_size`` / 4) ^ 2 + (``$block_size`` / 4) + 12 to (``$block_size`` / 4) ^ 3 + (``$block_size`` / 4) ^ 2 + (``$block_size`` / 4) + 12, or 1049612 to 1074791436 if 4KiB blocks)   |
     31|                     |                                                                                                                                                                                                                              |
     32|                     | +--------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------+                                          |
     33|                     | | Triple Indirect Block Offset   | Where It Points                                                                                                                                |                                          |
     34|                     | +================================+================================================================================================================================================+                                          |
     35|                     | | 0 to (``$block_size`` / 4)     | Map to (``$block_size`` / 4) double indirect blocks (1024 if 4KiB blocks)                                                                      |                                          |
     36|                     | |                                |                                                                                                                                                |                                          |
     37|                     | |                                | +--------------------------------+---------------------------------------------------------------------------------------------------------+   |                                          |
     38|                     | |                                | | Double Indirect Block Offset   | Where It Points                                                                                         |   |                                          |
     39|                     | |                                | +================================+=========================================================================================================+   |                                          |
     40|                     | |                                | | 0 to (``$block_size`` / 4)     | Map to (``$block_size`` / 4) indirect blocks (1024 if 4KiB blocks)                                      |   |                                          |
     41|                     | |                                | |                                |                                                                                                         |   |                                          |
     42|                     | |                                | |                                | +------------------------------+--------------------------------------------------------------------+   |   |                                          |
     43|                     | |                                | |                                | | Indirect Block Offset        | Where It Points                                                    |   |   |                                          |
     44|                     | |                                | |                                | +==============================+====================================================================+   |   |                                          |
     45|                     | |                                | |                                | | 0 to (``$block_size`` / 4)   | Direct map to (``$block_size`` / 4) blocks (1024 if 4KiB blocks)   |   |   |                                          |
     46|                     | |                                | |                                | +------------------------------+--------------------------------------------------------------------+   |   |                                          |
     47|                     | |                                | +--------------------------------+---------------------------------------------------------------------------------------------------------+   |                                          |
     48|                     | +--------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------+                                          |
     49+---------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+