From: Theodore Tso Subject: Re: Couple of queries related to htree directory Date: Thu, 14 Jun 2007 14:46:31 -0400 Message-ID: <20070614184630.GB14911@thunk.org> References: Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: linux-ext4@vger.kernel.org To: Tejas Sumant Return-path: Received: from thunk.org ([69.25.196.29]:47333 "EHLO thunker.thunk.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751168AbXFNSqz (ORCPT ); Thu, 14 Jun 2007 14:46:55 -0400 Content-Disposition: inline In-Reply-To: Sender: linux-ext4-owner@vger.kernel.org List-Id: linux-ext4.vger.kernel.org On Thu, Jun 14, 2007 at 06:52:01PM +0530, Tejas Sumant wrote: > > Any idea, how to search a directory on given ext3 file system, which > is having htree structure? The same way you search any other Linux/Unix system. I.e., using opendir()/readir() from a C program, or /bin/ls from a shell program, etc. It's completely transparent. > Also is there any way to create a htree indexed directory explicitly? > using some command or tool? Once the dir_index feature is enabled, for all new directories and all directories which are only take one disk block grow to bigger than one disk block, they automatically get indexed. (There's no point indexing a single directory block since that's equivalent to a single leaf block.) To convert existing directories, you need to unmount the filesystem and use the command: e2fsck -fD /dev/hdXX This really should be added to an FAQ on ext4.wiki.kernel.org.... - Ted