From patchwork Fri May 11 15:02:56 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Saugata Das X-Patchwork-Id: 158533 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 937DDB6FB6 for ; Sat, 12 May 2012 01:07:20 +1000 (EST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753040Ab2EKPHQ (ORCPT ); Fri, 11 May 2012 11:07:16 -0400 Received: from eu1sys200aog104.obsmtp.com ([207.126.144.117]:47104 "EHLO eu1sys200aog104.obsmtp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752082Ab2EKPHP (ORCPT ); Fri, 11 May 2012 11:07:15 -0400 Received: from beta.dmz-eu.st.com ([164.129.1.35]) (using TLSv1) by eu1sys200aob104.postini.com ([207.126.147.11]) with SMTP ID DSNKT60rGf3GM0fwRXXSB5wKtNKE9fsQuK7j@postini.com; Fri, 11 May 2012 15:07:15 UTC Received: from zeta.dmz-eu.st.com (zeta.dmz-eu.st.com [164.129.230.9]) by beta.dmz-eu.st.com (STMicroelectronics) with ESMTP id 0FB92348; Fri, 11 May 2012 15:06:59 +0000 (GMT) Received: from relay1.stm.gmessaging.net (unknown [10.230.100.17]) by zeta.dmz-eu.st.com (STMicroelectronics) with ESMTP id 5F91147A7; Fri, 11 May 2012 15:06:59 +0000 (GMT) Received: from exdcvycastm022.EQ1STM.local (alteon-source-exch [10.230.100.61]) (using TLSv1 with cipher RC4-MD5 (128/128 bits)) (Client CN "exdcvycastm022", Issuer "exdcvycastm022" (not verified)) by relay1.stm.gmessaging.net (Postfix) with ESMTPS id 2DF1624C080; Fri, 11 May 2012 17:06:51 +0200 (CEST) Received: from localhost (10.201.54.119) by exdcvycastm022.EQ1STM.local (10.230.100.30) with Microsoft SMTP Server (TLS) id 8.3.83.0; Fri, 11 May 2012 17:06:58 +0200 From: Saugata Das To: , Cc: , , , , , Saugata Das Subject: [PATCH 1/2] block: add BH_Meta flag Date: Fri, 11 May 2012 20:32:56 +0530 Message-ID: <1336748577-9258-1-git-send-email-saugata.das@stericsson.com> X-Mailer: git-send-email 1.7.4.3 MIME-Version: 1.0 Sender: linux-ext4-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-ext4@vger.kernel.org From: Saugata Das Today, storage devices like eMMC has special features like data tagging (introduced in MMC-4.5 version) in order to improve performance of some specific writes. On MMC stack, data tagging is used for all writes which has REQ_META flag set. This patch adds the capability to add REQ_META flag during meta data write. Signed-off-by: Saugata Das --- fs/buffer.c | 10 ++++++++-- include/linux/buffer_head.h | 2 ++ 2 files changed, 10 insertions(+), 2 deletions(-) diff --git a/fs/buffer.c b/fs/buffer.c index 36d6665..688b38b 100644 --- a/fs/buffer.c +++ b/fs/buffer.c @@ -1685,7 +1685,10 @@ static int __block_write_full_page(struct inode *inode, struct page *page, do { struct buffer_head *next = bh->b_this_page; if (buffer_async_write(bh)) { - submit_bh(write_op, bh); + if (buffer_meta(bh)) + submit_bh(write_op | REQ_META, bh); + else + submit_bh(write_op, bh); nr_underway++; } bh = next; @@ -1739,7 +1742,10 @@ recover: struct buffer_head *next = bh->b_this_page; if (buffer_async_write(bh)) { clear_buffer_dirty(bh); - submit_bh(write_op, bh); + if (buffer_meta(bh)) + submit_bh(write_op | REQ_META, bh); + else + submit_bh(write_op, bh); nr_underway++; } bh = next; diff --git a/include/linux/buffer_head.h b/include/linux/buffer_head.h index ef26043..0776564 100644 --- a/include/linux/buffer_head.h +++ b/include/linux/buffer_head.h @@ -34,6 +34,7 @@ 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, /* Is meta */ BH_PrivateStart,/* not a state bit, but the first bit available * for private allocation by other entities @@ -126,6 +127,7 @@ BUFFER_FNS(Delay, delay) BUFFER_FNS(Boundary, boundary) BUFFER_FNS(Write_EIO, write_io_error) BUFFER_FNS(Unwritten, unwritten) +BUFFER_FNS(Meta, meta) #define bh_offset(bh) ((unsigned long)(bh)->b_data & ~PAGE_MASK) #define touch_buffer(bh) mark_page_accessed(bh->b_page)