From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andi Kleen Subject: Re: idea about internal fragmentation in Btrfs Date: Sat, 19 Jun 2010 10:51:22 +0200 Message-ID: <87k4pvo16d.fsf@basil.nowhere.org> References: Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: linux-kernel@vger.kernel.org, linux-btrfs@vger.kernel.org To: Zhihui Zhang Return-path: In-Reply-To: (Zhihui Zhang's message of "Fri, 18 Jun 2010 14:12:22 -0400") List-ID: Zhihui Zhang writes: > I wish Btrfs well, so I would venture an idea for this specific case > mentioned by Edward Shishkin today. > > Everyone knows that B-tree has internal and leaf nodes. Can we make > the root as the leaf? In other words, if you > create a 2K file, the B-tree will have only one node, which is both > the root and the leaf. Of course, you need some flag to > say this is a "degenerated" form of B-tree. Please cc me if you want > my response. You need to copy linux-btrfs to reach btrfs developers. Ccs added The problem with your idea is that on btrfs there's only a single tree for the whole fs (or whole snapshot rather) So it would only work for a single file because there's only a single root. -Andi -- ak@linux.intel.com -- Speaking for myself only.