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cramfs: implement uncompressed and arbitrary data block positioning
Two new capabilities are introduced here: - The ability to store some blocks uncompressed. - The ability to locate blocks anywhere. Those capabilities can be used independently, but the combination opens the possibility for execute-in-place (XIP) of program text segments that must remain uncompressed, and in the MMU case, must have a specific alignment. It is even possible to still have the writable data segments from the same file compressed as they have to be copied into RAM anyway. This is achieved by giving special meanings to some unused block pointer bits while remaining compatible with legacy cramfs images. Signed-off-by: Nicolas Pitre <[email protected]> Tested-by: Chris Brandt <[email protected]> Signed-off-by: Al Viro <[email protected]>
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Nicolas Pitre
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Al Viro
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Oct 15, 2017
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