From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andrew Morton Subject: Re: [PATCH] Doc fix: ext2 can only have 32,000 subdirs, not 32,768. Date: Sat, 30 May 2009 17:13:26 -0700 Message-ID: <20090530171326.1381aa2d.akpm@linux-foundation.org> References: <63a2e74f0905181213r54a2d8b2tb7dcecd177d474c2@mail.gmail.com> <20090527172045.f33b0b49.akpm@linux-foundation.org> <20090530113724.GA1444@ucw.cz> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Cc: Michael Shields , rdunlap@xenotime.net, linux-ext4@vger.kernel.org, linux-kernel@vger.kernel.org, trivial@kernel.org To: Pavel Machek Return-path: Received: from smtp1.linux-foundation.org ([140.211.169.13]:41899 "EHLO smtp1.linux-foundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753130AbZEaAOl (ORCPT ); Sat, 30 May 2009 20:14:41 -0400 In-Reply-To: <20090530113724.GA1444@ucw.cz> Sender: linux-ext4-owner@vger.kernel.org List-ID: On Sat, 30 May 2009 13:37:24 +0200 Pavel Machek wrote: > On Wed 2009-05-27 17:20:45, Andrew Morton wrote: > > On Mon, 18 May 2009 12:13:51 -0700 > > Michael Shields wrote: > > > > > ext2.txt says that dirs can have 32,768 subdirs, but the actual value > > > of EXT2_LINK_MAX is 32000. > > > ext3 is the same, but the doc does not mention it. __One of ext4's > > > features is to "fix 32000 subdirectory limit". > > > > > > --- linux-2.6.29.3/Documentation/filesystems/ext2.txt.orig 2009-05-08 > > > 15:47:21.000000000 -0700 > > > +++ linux-2.6.29.3/Documentation/filesystems/ext2.txt 2009-05-18 > > > 12:03:58.000000000 -0700 > > > @@ -322,7 +322,7 @@ an upper limit on the block size imposed > > > __so 8kB blocks are only allowed on Alpha systems (and other architectures > > > __which support larger pages). > > > > > > -There is an upper limit of 32768 subdirectories in a single directory. > > > +There is an upper limit of 32000 subdirectories in a single directory. > > > > > > __There is a "soft" upper limit of about 10-15k files in a single directory > > > __with the current linear linked-list directory implementation. __This limit > > > -- > > Maybe it would be better to increase EXT2_LINK_MAX to fit the docs? > Could be. afacit filesystems which are created under such a driver will still mount and work OK with older drivers. I have this vague memory that there was a reason for the 32000 thing.