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DateThu, 24 May 2007 08:57:08 +0200
FromCarsten Otte <>
SubjectRe: [PATCH 2.6.21] cramfs: add cramfs Linear XIP
Jared Hulbert wrote:
>> To me, it looks like this
>> work can be modified to use filemap_xip.
>
> How?
First, get a struct page behind the subject file system image. A good
idea to get there is to use vmem_map, which allows have a
discontiguous mem_map array in virtual storage. Then add the memory
segment's address range to it. Sparsemem also helps, if vmem_map is
not available.

Second, implement get_xip_page for this file system. This address
space operation needs to be provided for all files that are supposed
to be XIP. readpage(s)/writepage(s) should not be provided for these
files, becuase they rely on using the page cache.

Third, use file operations from mm/filemap_xip.c.

so long,
Carsten
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