From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Sun, 24 Jun 2007 03:53:55 +0200 From: Nick Piggin Subject: Re: [RFC] fsblock Message-ID: <20070624015355.GE17609@wotan.suse.de> References: <20070624014528.GA17609@wotan.suse.de> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20070624014528.GA17609@wotan.suse.de> Sender: owner-linux-mm@kvack.org Return-Path: To: Linux Kernel Mailing List , Linux Memory Management List , linux-fsdevel@vger.kernel.org List-ID: Just clarify a few things. Don't you hate rereading a long work you wrote? (oh, you're supposed to do that *before* you press send?). On Sun, Jun 24, 2007 at 03:45:28AM +0200, Nick Piggin wrote: > > I'm announcing "fsblock" now because it is quite intrusive and so I'd > like to get some thoughts about significantly changing this core part > of the kernel. > > fsblock is a rewrite of the "buffer layer" (ding dong the witch is > dead), which I have been working on, on and off and is now at the stage > where some of the basics are working-ish. This email is going to be > long... > > Firstly, what is the buffer layer? The buffer layer isn't really a > buffer layer as in the buffer cache of unix: the block device cache > is unified with the pagecache (in terms of the pagecache, a blkdev > file is just like any other, but with a 1:1 mapping between offset > and block). I mean, in Linux, the block device cache is unified. UNIX I believe did all its caching in a buffer cache, below the filesystem. > - Large block support. I can mount and run an 8K block size minix3 fs on > my 4K page system and it didn't require anything special in the fs. We Oh, and I don't have a Linux mkfs that makes minixv3 filesystems. I had an image kindly made for me because I don't use minix. If you want to test large block support, I won't email it to you though: you can just convert ext2 or ext3 to fsblock ;) -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org