8a98ec7c7b
Move the ext4 data structures book to Documentation/filesystems/ext4/ since the administrative information moved elsewhere. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
50 lines
11 KiB
ReStructuredText
50 lines
11 KiB
ReStructuredText
.. SPDX-License-Identifier: GPL-2.0
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+---------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
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| i.i\_block Offset | Where It Points |
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+=====================+==============================================================================================================================================================================================================================+
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| 0 to 11 | Direct map to file blocks 0 to 11. |
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+---------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
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| 12 | Indirect block: (file blocks 12 to (``$block_size`` / 4) + 11, or 12 to 1035 if 4KiB blocks) |
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| | +------------------------------+--------------------------------------------------------------------+ |
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| | | Indirect Block Offset | Where It Points | |
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| | +==============================+====================================================================+ |
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| | | 0 to (``$block_size`` / 4) | Direct map to (``$block_size`` / 4) blocks (1024 if 4KiB blocks) | |
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| | +------------------------------+--------------------------------------------------------------------+ |
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+---------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
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| 13 | Double-indirect block: (file blocks ``$block_size``/4 + 12 to (``$block_size`` / 4) ^ 2 + (``$block_size`` / 4) + 11, or 1036 to 1049611 if 4KiB blocks) |
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| | +--------------------------------+---------------------------------------------------------------------------------------------------------+ |
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| | | Double Indirect Block Offset | Where It Points | |
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| | +================================+=========================================================================================================+ |
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| | | 0 to (``$block_size`` / 4) | Map to (``$block_size`` / 4) indirect blocks (1024 if 4KiB blocks) | |
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| | | | | |
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| | | | +------------------------------+--------------------------------------------------------------------+ | |
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| | | | | Indirect Block Offset | Where It Points | | |
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| | | | +==============================+====================================================================+ | |
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| | | | | 0 to (``$block_size`` / 4) | Direct map to (``$block_size`` / 4) blocks (1024 if 4KiB blocks) | | |
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| | | | +------------------------------+--------------------------------------------------------------------+ | |
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| | +--------------------------------+---------------------------------------------------------------------------------------------------------+ |
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+---------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
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| 14 | Triple-indirect block: (file blocks (``$block_size`` / 4) ^ 2 + (``$block_size`` / 4) + 12 to (``$block_size`` / 4) ^ 3 + (``$block_size`` / 4) ^ 2 + (``$block_size`` / 4) + 12, or 1049612 to 1074791436 if 4KiB blocks) |
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| | +--------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------+ |
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| | | Triple Indirect Block Offset | Where It Points | |
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| | +================================+================================================================================================================================================+ |
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| | | 0 to (``$block_size`` / 4) | Map to (``$block_size`` / 4) double indirect blocks (1024 if 4KiB blocks) | |
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| | | | +--------------------------------+---------------------------------------------------------------------------------------------------------+ | |
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| | | | | Double Indirect Block Offset | Where It Points | | |
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| | | | +================================+=========================================================================================================+ | |
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| | | | | 0 to (``$block_size`` / 4) | Map to (``$block_size`` / 4) indirect blocks (1024 if 4KiB blocks) | | |
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| | | | | | | | |
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| | | | | | +------------------------------+--------------------------------------------------------------------+ | | |
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| | | | | | | Indirect Block Offset | Where It Points | | | |
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| | | | | | +==============================+====================================================================+ | | |
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| | | | | | | 0 to (``$block_size`` / 4) | Direct map to (``$block_size`` / 4) blocks (1024 if 4KiB blocks) | | | |
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| | | | | | +------------------------------+--------------------------------------------------------------------+ | | |
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| | | | +--------------------------------+---------------------------------------------------------------------------------------------------------+ | |
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| | +--------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------+ |
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+---------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
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