From mboxrd@z Thu Jan 1 00:00:00 1970 From: Theodore Ts'o Subject: Re: [PATCH 17/26] ext4: Use transaction reservation for extent conversion in ext4_end_io Date: Tue, 4 Jun 2013 13:29:22 -0400 Message-ID: <20130604172922.GH3030@thunk.org> References: <1369993379-13017-1-git-send-email-jack@suse.cz> <1369993379-13017-18-git-send-email-jack@suse.cz> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: linux-ext4@vger.kernel.org To: Jan Kara Return-path: Received: from li9-11.members.linode.com ([67.18.176.11]:54788 "EHLO imap.thunk.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753479Ab3FDR30 (ORCPT ); Tue, 4 Jun 2013 13:29:26 -0400 Content-Disposition: inline In-Reply-To: <1369993379-13017-18-git-send-email-jack@suse.cz> Sender: linux-ext4-owner@vger.kernel.org List-ID: On Fri, May 31, 2013 at 11:42:50AM +0200, Jan Kara wrote: > Later we would like to clear PageWriteback bit only after extent conversion > from unwritten to written extents is performed. However it is not possible > to start a transaction after PageWriteback is set because that violates > lock ordering (and is easy to deadlock). So we have to reserve a transaction > before locking pages and sending them for IO and later we use the transaction > for extent conversion from ext4_end_io(). > > Reviewed-by: Zheng Liu > Signed-off-by: Jan Kara Thanks, applied. - Ted