From patchwork Sun Apr 21 00:07:07 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Theodore Ts'o X-Patchwork-Id: 238192 Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id A55402C014E for ; Sun, 21 Apr 2013 10:07:51 +1000 (EST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756113Ab3DUAHZ (ORCPT ); Sat, 20 Apr 2013 20:07:25 -0400 Received: from li9-11.members.linode.com ([67.18.176.11]:43171 "EHLO imap.thunk.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756025Ab3DUAHY (ORCPT ); Sat, 20 Apr 2013 20:07:24 -0400 Received: from root (helo=closure.thunk.org) by imap.thunk.org with local-esmtp (Exim 4.80) (envelope-from ) id 1UThoo-0001rW-7t; Sun, 21 Apr 2013 00:07:46 +0000 Received: by closure.thunk.org (Postfix, from userid 15806) id 69B765821D9; Sat, 20 Apr 2013 20:07:08 -0400 (EDT) From: Theodore Ts'o To: Ext4 Developers List Cc: linux-mm@kvack.org, Linux Kernel Developers List , mgorman@suse.de, Theodore Ts'o Subject: [PATCH 2/3] buffer: add BH_Prio and BH_Meta flags Date: Sat, 20 Apr 2013 20:07:07 -0400 Message-Id: <1366502828-7793-2-git-send-email-tytso@mit.edu> X-Mailer: git-send-email 1.7.12.rc0.22.gcdd159b In-Reply-To: <1366502828-7793-1-git-send-email-tytso@mit.edu> References: <20130421000522.GA5054@thunk.org> <1366502828-7793-1-git-send-email-tytso@mit.edu> X-SA-Exim-Connect-IP: X-SA-Exim-Mail-From: tytso@thunk.org X-SA-Exim-Scanned: No (on imap.thunk.org); SAEximRunCond expanded to false Sender: linux-ext4-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-ext4@vger.kernel.org Add buffer_head flags so that buffer cache writebacks can be marked with the the appropriate request flags, so that metadata blocks can be marked appropriately in blktrace. Signed-off-by: "Theodore Ts'o" --- fs/buffer.c | 5 +++++ include/linux/buffer_head.h | 4 ++++ 2 files changed, 9 insertions(+) diff --git a/fs/buffer.c b/fs/buffer.c index b4dcb34..a15575c 100644 --- a/fs/buffer.c +++ b/fs/buffer.c @@ -2988,6 +2988,11 @@ int submit_bh(int rw, struct buffer_head * bh) /* Take care of bh's that straddle the end of the device */ guard_bh_eod(rw, bio, bh); + if (buffer_meta(bh)) + rw |= REQ_META; + if (buffer_prio(bh)) + rw |= REQ_PRIO; + bio_get(bio); submit_bio(rw, bio); diff --git a/include/linux/buffer_head.h b/include/linux/buffer_head.h index 5afc4f9..33c0f81 100644 --- a/include/linux/buffer_head.h +++ b/include/linux/buffer_head.h @@ -34,6 +34,8 @@ enum bh_state_bits { BH_Write_EIO, /* I/O error on write */ BH_Unwritten, /* Buffer is allocated on disk but not written */ BH_Quiet, /* Buffer Error Prinks to be quiet */ + BH_Meta, /* Buffer contains metadata */ + BH_Prio, /* Buffer should be submitted with REQ_PRIO */ BH_PrivateStart,/* not a state bit, but the first bit available * for private allocation by other entities @@ -124,6 +126,8 @@ BUFFER_FNS(Delay, delay) BUFFER_FNS(Boundary, boundary) BUFFER_FNS(Write_EIO, write_io_error) BUFFER_FNS(Unwritten, unwritten) +BUFFER_FNS(Meta, meta) +BUFFER_FNS(Prio, prio) #define bh_offset(bh) ((unsigned long)(bh)->b_data & ~PAGE_MASK)