From: Andreas Dilger <adilger@clusterfs.com>
To: Christoph Hellwig <hch@infradead.org>,
Nikita Danilov <Nikita@Namesys.COM>,
Linus Torvalds <Torvalds@Transmeta.COM>,
Linux Kernel Mailing List <Linux-Kernel@Vger.Kernel.ORG>,
Reiserfs mail-list <Reiserfs-List@Namesys.COM>
Subject: Re: [PATCH]: reiser4 [5/8] export remove_from_page_cache()
Date: Thu, 31 Oct 2002 10:33:11 -0700 [thread overview]
Message-ID: <20021031173311.GA23959@clusterfs.com> (raw)
In-Reply-To: <20021031163104.A9845@infradead.org>
On Oct 31, 2002 16:31 +0000, Christoph Hellwig wrote:
> 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?
That would be what we have been calling "punch", and is quite useful
for putting holes in files (i.e. making them sparse again). This
can be used for InterMezzo (among other things) so that the KML log
file can be growing at the end, but being punched out at the start
so it doesn't use up a lot of disk space.
Not that I'm holding my breath on getting this in the kernel, but
it is definitely useful.
Cheers, Andreas
--
Andreas Dilger
http://www-mddsp.enel.ucalgary.ca/People/adilger/
http://sourceforge.net/projects/ext2resize/
next prev parent reply other threads:[~2002-10-31 17:29 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-10-31 16:03 [PATCH]: reiser4 [5/8] export remove_from_page_cache() Nikita Danilov
2002-10-31 16:18 ` Christoph Hellwig
2002-10-31 16:24 ` Nikita Danilov
2002-10-31 16:31 ` Christoph Hellwig
2002-10-31 16:45 ` Nikita Danilov
2002-10-31 16:58 ` Christoph Hellwig
2002-10-31 17:04 ` Nikita Danilov
2002-10-31 17:12 ` Christoph Hellwig
2002-10-31 17:33 ` Andreas Dilger [this message]
2002-10-31 18:25 ` Nikita Danilov
2002-10-31 20:17 ` Ragnar Kjørstad
2002-10-31 18:57 ` Linus Torvalds
2002-11-01 21:56 ` Andreas Dilger
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