From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S935271AbZAPOAs (ORCPT ); Fri, 16 Jan 2009 09:00:48 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S935095AbZAPN7r (ORCPT ); Fri, 16 Jan 2009 08:59:47 -0500 Received: from serv2.oss.ntt.co.jp ([222.151.198.100]:59541 "EHLO serv2.oss.ntt.co.jp" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933566AbZAPN7q (ORCPT ); Fri, 16 Jan 2009 08:59:46 -0500 Subject: ext4: call blkdev_issue_flush on fsync From: Fernando Luis =?ISO-8859-1?Q?V=E1zquez?= Cao To: Jan Kara Cc: Theodore Tso , Alan Cox , Pavel Machek , kernel list , Jens Axboe , sandeen@redhat.com, fernando@kic.ac.jp In-Reply-To: <1232109069.13775.35.camel@sebastian.kern.oss.ntt.co.jp> References: <20090113140347.GD17664@mit.edu> <20090113143011.GB10064@duck.suse.cz> <1231904239.11640.38.camel@sebastian.kern.oss.ntt.co.jp> <20090114103532.GA18834@duck.suse.cz> <20090114132146.GC6222@mit.edu> <20090114140532.GC19950@duck.suse.cz> <20090114141204.GD6222@mit.edu> <20090114143756.GF19950@duck.suse.cz> <20090114165952.GH6222@mit.edu> <1232021211.14626.19.camel@sebastian.kern.oss.ntt.co.jp> <20090115234544.GA7579@duck.suse.cz> <1232109069.13775.35.camel@sebastian.kern.oss.ntt.co.jp> Content-Type: text/plain Organization: NTT Open Source Software Center Date: Fri, 16 Jan 2009 22:59:44 +0900 Message-Id: <1232114384.13775.68.camel@sebastian.kern.oss.ntt.co.jp> Mime-Version: 1.0 X-Mailer: Evolution 2.22.3.1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org To ensure that bits are truly on-disk after an fsync or fdatasync, we should force a disk flush explicitly when there is dirty data/metadata and the journal didn't emit a write barrier (either because metadata is not being synched or barriers are disabled). Signed-off-by: Fernando Luis Vazquez Cao --- --- linux-2.6.29-rc1-orig/fs/ext4/fsync.c 2008-12-25 08:26:37.000000000 +0900 +++ linux-2.6.29-rc1/fs/ext4/fsync.c 2009-01-16 22:18:51.000000000 +0900 @@ -48,6 +48,7 @@ int ext4_sync_file(struct file *file, st { struct inode *inode = dentry->d_inode; journal_t *journal = EXT4_SB(inode->i_sb)->s_journal; + unsigned long i_state = inode->i_state; int ret = 0; J_ASSERT(ext4_journal_current_handle() == NULL); @@ -76,25 +77,33 @@ int ext4_sync_file(struct file *file, st */ if (ext4_should_journal_data(inode)) { ret = ext4_force_commit(inode->i_sb); + if (!(journal->j_flags & JBD2_BARRIER)) + goto no_journal_barrier; goto out; } - if (datasync && !(inode->i_state & I_DIRTY_DATASYNC)) - goto out; + if (datasync && !(i_state & I_DIRTY_DATASYNC)) + goto flush_blkdev; /* * The VFS has written the file data. If the inode is unaltered * then we need not start a commit. */ - if (inode->i_state & (I_DIRTY_SYNC|I_DIRTY_DATASYNC)) { + if (i_state & (I_DIRTY_SYNC|I_DIRTY_DATASYNC)) { struct writeback_control wbc = { .sync_mode = WB_SYNC_ALL, .nr_to_write = 0, /* sys_fsync did this */ }; ret = sync_inode(inode, &wbc); - if (journal && (journal->j_flags & JBD2_BARRIER)) - blkdev_issue_flush(inode->i_sb->s_bdev, NULL); + if (journal && !(journal->j_flags & JBD2_BARRIER)) + goto no_journal_barrier; } + +flush_blkdev: + if (!(i_state & I_DIRTY_PAGES)) + goto out; +no_journal_barrier: + blkdev_issue_flush(inode->i_sb->s_bdev, NULL); out: return ret; }