From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from moutng.kundenserver.de ([212.227.126.188]) by bombadil.infradead.org with esmtp (Exim 4.68 #1 (Red Hat Linux)) id 1KWciQ-0005a6-4h for linux-mtd@lists.infradead.org; Fri, 22 Aug 2008 19:54:34 +0000 From: Arnd Bergmann To: Phillip Lougher Subject: Re: [PATCH 06/10] AXFS: axfs_super.c Date: Fri, 22 Aug 2008 21:49:20 +0200 References: <48AD0101.4020505@gmail.com> <200808221852.38950.arnd@arndb.de> <48AEF976.1010705@lougher.demon.co.uk> In-Reply-To: <48AEF976.1010705@lougher.demon.co.uk> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Content-Disposition: inline Message-Id: <200808222149.21186.arnd@arndb.de> Cc: cotte@de.ibm.com, linux-embedded@vger.kernel.org, nickpiggin@yahoo.com.au, =?utf-8?q?J=C3=B6rn_Engel?= , Linux-kernel@vger.kernel.org, linux-mtd , tim.bird@am.sony.com List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , On Friday 22 August 2008, Phillip Lougher wrote: > 1. Support for > 4GB filesystems. =C2=A0In theory 2^64 bytes. > 2. Compressed metadata > 3. Inode timestamps > 4. Hard-link support, and correct nlink counts > 5. Sparse file support > 6. Support for ". & ".." in readdir > 7. Indexed directories for fast lookup > 8. NFS exporting > 9. No need to cache entire metadata in memory > > Squashfs has been optimised for block-based rotating media like hard=20 > disks, CDROMS. =C2=A0AXFS has been optimised for flash based media. =C2= =A0Squashfs=20 > will outperform AXFS on rotating media, AXFS will outperform Squashfs on= =20 > flash based media. Ok, thanks for the list. I'm sure that sparse files are already part of AXFS, and among the other things, I would consider some to be AXFS bugs rather than squashfs features ("." in readdir, in particular), but I get the point. > Squashfs and AXFS should be seen as complementary filesystems, and there= =20 > should be room in the Linux kernel for both. >=20 > I don't see what your problem is here. =C2=A0I think AXFS is an extremely= =20 > good filesystem and should be merged. =C2=A0But I don't see why this shou= ld=20 > lead to more Squashfs bashing. Sorry, I didn't mean to be abusive. From first look, it appeared to do everything that squashfs does, with less code, but you've made it clear that there is need for both of them. I would still expect axfs to replace cramfs for all practical purposes, even though that was written by our Emperor Penguin ;-) Arnd <><