linux-kernel - Re: [PATCH 2.6.21] cramfs: add cramfs Linear XIP

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Message-ID: <465534B9.2030105@de.ibm.com>
Date:	Thu, 24 May 2007 08:46:17 +0200
From:	Carsten Otte <cotte@...ibm.com>
To:	richard.griffiths@...driver.com
CC:	carsteno@...ibm.com, Andrew Morton <akpm@...ux-foundation.org>,
	Linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2.6.21] cramfs: add cramfs Linear XIP

Richard Griffiths (wrs) wrote:
> One question I have is the difference in the two models. If I understand
> correctly the filemap_xip expects the ext2 to mount as XIP while the
> Linear Cramfs only enables XIP for apps that have the sticky bit set.
> Hence the Application XIP moniker.
> Does the filemap_xip expect the entire filesystem is XIP?
The file operations from filemap_xip are only effective if the struct 
file_operations vector refers to them (see ext2_xip_file_operations in 
fs/ext2/file.c as example). In oder to function proper, the 
corresponding address_space_operations vector needs to provide an 
implementation of get_xip_page (see ext2_get_xip_page in 
fs/ext2/xip.c). Both vectors are per inode, one can chose to have XIP 
for individual files in a file system.

so long,
Carsten
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