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Date: Thu, 31 Oct 2002 16:31:04 +0000
From: Christoph Hellwig <hch@infradead.org>
To: Nikita Danilov <Nikita@Namesys.COM>
Cc: Linus Torvalds <Torvalds@Transmeta.COM>,
       Linux Kernel Mailing List <Linux-Kernel@Vger.Kernel.ORG>,
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Subject: Re: [PATCH]: reiser4 [5/8] export remove_from_page_cache()
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On Thu, Oct 31, 2002 at 07:24:40PM +0300, Nikita Danilov wrote:
> Reiser4 stores meta-data in a huge balanced tree. This tree is kept
> (partially) in the page cache. All pages in this tree are attached to
> "fake" inode. Sometimes you need to remove node from the tree. At this
> moment page has to be removed from the fake inode mapping.

What about chaing truncate_inode_pages to take an additional len
argument so you don't have to remove all pages past an offset?

> 
> Other file systems don't need remove_from_page_cache() because they only
> store in the page cache data (and remove_from_page_cache() is called by
> truncate()) and meta data that are never explicitly deleted (like
> directory content in ext2).

Sorry, but that's wrong.  XFS does use the pagecache for all metadata and JFS
for all but the superblock (which is never changed durin use)

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