From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,UNPARSEABLE_RELAY autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id D5EB3C433DF for ; Thu, 14 May 2020 15:11:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A255D205CB for ; Thu, 14 May 2020 15:11:09 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=oracle.com header.i=@oracle.com header.b="rS3SmW5i" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727918AbgENPLI (ORCPT ); Thu, 14 May 2020 11:11:08 -0400 Received: from userp2130.oracle.com ([156.151.31.86]:42202 "EHLO userp2130.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726179AbgENPLI (ORCPT ); Thu, 14 May 2020 11:11:08 -0400 Received: from pps.filterd (userp2130.oracle.com [127.0.0.1]) by userp2130.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 04EF6ivB050766; Thu, 14 May 2020 15:10:49 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=date : from : to : cc : subject : message-id : references : mime-version : content-type : in-reply-to; s=corp-2020-01-29; bh=D8NhpPSFFztulPVkrQdVl2nP3z7xGWGij5QHkBwYjV8=; b=rS3SmW5iiwyKzyXUBrkAjp2oIPQXXLvwm9BigAmr2opBvBQq/Nnez14p83QOcIDiA5w4 XZN2mjRU3VjBeKmIXXcytMYPsyFkzmlBsP/IY9gUOhZMlS8g+50md4bpKsbzty2KDt82 letvn4VyTMVgug8MDv3z5TC7AvflUSs/mFeePEB+cBZfwvUOPtZ8YZP+j3xfQ03b+Z+H sPijYrLqjxmQy+IKpYouLrWPOtzz6B/vtgDqZe18dg2P+tOzzpDp5jJYdmE2e55UGgxK qeARcuO9xbnW44Sg2ql3tFbspyScCSbY+wkpMGgbQhrS/WkZhoZyLTjVYCd1NORDV7Lz 0Q== Received: from userp3030.oracle.com (userp3030.oracle.com [156.151.31.80]) by userp2130.oracle.com with ESMTP id 3100yg358m-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL); Thu, 14 May 2020 15:10:49 +0000 Received: from pps.filterd (userp3030.oracle.com [127.0.0.1]) by userp3030.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 04EF8KsF046726; Thu, 14 May 2020 15:08:49 GMT Received: from userv0121.oracle.com (userv0121.oracle.com [156.151.31.72]) by userp3030.oracle.com with ESMTP id 3100ygxuhb-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 14 May 2020 15:08:48 +0000 Received: from abhmp0012.oracle.com (abhmp0012.oracle.com [141.146.116.18]) by userv0121.oracle.com (8.14.4/8.13.8) with ESMTP id 04EF8e1Z004116; Thu, 14 May 2020 15:08:40 GMT Received: from localhost (/67.169.218.210) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Thu, 14 May 2020 08:08:40 -0700 Date: Thu, 14 May 2020 08:08:39 -0700 From: "Darrick J. Wong" To: ira.weiny@intel.com Cc: linux-ext4@vger.kernel.org, Andreas Dilger , "Theodore Y. Ts'o" , Jan Kara , Al Viro , Dan Williams , Dave Chinner , Christoph Hellwig , Jeff Moyer , linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH V1 7/9] fs/ext4: Make DAX mount option a tri-state Message-ID: <20200514150839.GB2077014@magnolia> References: <20200514065316.2500078-1-ira.weiny@intel.com> <20200514065316.2500078-8-ira.weiny@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200514065316.2500078-8-ira.weiny@intel.com> X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9621 signatures=668687 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 spamscore=0 malwarescore=0 bulkscore=0 phishscore=0 suspectscore=0 adultscore=0 mlxscore=0 mlxlogscore=999 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2004280000 definitions=main-2005140133 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9621 signatures=668687 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 lowpriorityscore=0 adultscore=0 cotscore=-2147483648 mlxscore=0 suspectscore=0 spamscore=0 impostorscore=0 mlxlogscore=999 malwarescore=0 clxscore=1015 phishscore=0 bulkscore=0 priorityscore=1501 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2004280000 definitions=main-2005140133 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, May 13, 2020 at 11:53:13PM -0700, ira.weiny@intel.com wrote: > From: Ira Weiny > > We add 'always', 'never', and 'inode' (default). '-o dax' continue to > operate the same. > > Specifically we introduce a 2nd DAX mount flag EXT4_MOUNT2_DAX_NEVER and set > it and EXT4_MOUNT_DAX_ALWAYS appropriately. > > We also force EXT4_MOUNT2_DAX_NEVER if !CONFIG_FS_DAX. > > https://lore.kernel.org/lkml/20200405061945.GA94792@iweiny-DESK2.sc.intel.com/ > > Signed-off-by: Ira Weiny > > --- > Changes from RFC: > Combine remount check for DAX_NEVER with DAX_ALWAYS > Update ext4_should_enable_dax() > --- > fs/ext4/ext4.h | 1 + > fs/ext4/inode.c | 2 ++ > fs/ext4/super.c | 43 +++++++++++++++++++++++++++++++++++++------ > 3 files changed, 40 insertions(+), 6 deletions(-) > > diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h > index 86a0994332ce..01d1de838896 100644 > --- a/fs/ext4/ext4.h > +++ b/fs/ext4/ext4.h > @@ -1168,6 +1168,7 @@ struct ext4_inode_info { > blocks */ > #define EXT4_MOUNT2_HURD_COMPAT 0x00000004 /* Support HURD-castrated > file systems */ > +#define EXT4_MOUNT2_DAX_NEVER 0x00000008 /* Do not allow Direct Access */ > > #define EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM 0x00000008 /* User explicitly > specified journal checksum */ > diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c > index 23e42a223235..140b1930e2f4 100644 > --- a/fs/ext4/inode.c > +++ b/fs/ext4/inode.c > @@ -4400,6 +4400,8 @@ int ext4_get_inode_loc(struct inode *inode, struct ext4_iloc *iloc) > > static bool ext4_should_enable_dax(struct inode *inode) > { > + if (test_opt2(inode->i_sb, DAX_NEVER)) > + return false; > if (!S_ISREG(inode->i_mode)) > return false; > if (ext4_should_journal_data(inode)) > diff --git a/fs/ext4/super.c b/fs/ext4/super.c > index 5ec900fdf73c..e01a040a58a9 100644 > --- a/fs/ext4/super.c > +++ b/fs/ext4/super.c > @@ -1505,6 +1505,7 @@ enum { > Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota, > Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err, > Opt_usrquota, Opt_grpquota, Opt_prjquota, Opt_i_version, Opt_dax, > + Opt_dax_str, > Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_warn_on_error, > Opt_nowarn_on_error, Opt_mblk_io_submit, > Opt_lazytime, Opt_nolazytime, Opt_debug_want_extra_isize, > @@ -1570,6 +1571,7 @@ static const match_table_t tokens = { > {Opt_barrier, "barrier"}, > {Opt_nobarrier, "nobarrier"}, > {Opt_i_version, "i_version"}, > + {Opt_dax_str, "dax=%s"}, > {Opt_dax, "dax"}, > {Opt_stripe, "stripe=%u"}, > {Opt_delalloc, "delalloc"}, > @@ -1767,6 +1769,7 @@ static const struct mount_opts { > {Opt_min_batch_time, 0, MOPT_GTE0}, > {Opt_inode_readahead_blks, 0, MOPT_GTE0}, > {Opt_init_itable, 0, MOPT_GTE0}, > + {Opt_dax_str, 0, MOPT_STRING}, > {Opt_dax, EXT4_MOUNT_DAX_ALWAYS, MOPT_SET}, > {Opt_stripe, 0, MOPT_GTE0}, > {Opt_resuid, 0, MOPT_GTE0}, > @@ -2076,13 +2079,32 @@ static int handle_mount_opt(struct super_block *sb, char *opt, int token, > } > sbi->s_jquota_fmt = m->mount_opt; > #endif > - } else if (token == Opt_dax) { > + } else if (token == Opt_dax || token == Opt_dax_str) { > #ifdef CONFIG_FS_DAX > - ext4_msg(sb, KERN_WARNING, > - "DAX enabled. Warning: EXPERIMENTAL, use at your own risk"); > - sbi->s_mount_opt |= m->mount_opt; > + char *tmp = match_strdup(&args[0]); > + > + if (!tmp || !strcmp(tmp, "always")) { > + ext4_msg(sb, KERN_WARNING, > + "DAX enabled. Warning: EXPERIMENTAL, use at your own risk"); > + sbi->s_mount_opt |= EXT4_MOUNT_DAX_ALWAYS; > + sbi->s_mount_opt2 &= ~EXT4_MOUNT2_DAX_NEVER; > + } else if (!strcmp(tmp, "never")) { > + sbi->s_mount_opt2 |= EXT4_MOUNT2_DAX_NEVER; > + sbi->s_mount_opt &= ~EXT4_MOUNT_DAX_ALWAYS; > + } else if (!strcmp(tmp, "inode")) { > + sbi->s_mount_opt &= ~EXT4_MOUNT_DAX_ALWAYS; > + sbi->s_mount_opt2 &= ~EXT4_MOUNT2_DAX_NEVER; > + } else { > + ext4_msg(sb, KERN_WARNING, "DAX invalid option."); > + kfree(tmp); > + return -1; > + } > + > + kfree(tmp); > #else > ext4_msg(sb, KERN_INFO, "dax option not supported"); > + sbi->s_mount_opt2 |= EXT4_MOUNT2_DAX_NEVER; > + sbi->s_mount_opt &= ~EXT4_MOUNT_DAX_ALWAYS; > return -1; > #endif > } else if (token == Opt_data_err_abort) { > @@ -2306,6 +2328,13 @@ static int _ext4_show_options(struct seq_file *seq, struct super_block *sb, > if (DUMMY_ENCRYPTION_ENABLED(sbi)) > SEQ_OPTS_PUTS("test_dummy_encryption"); > > + if (test_opt2(sb, DAX_NEVER)) > + SEQ_OPTS_PUTS("dax=never"); > + else if (test_opt(sb, DAX_ALWAYS)) > + SEQ_OPTS_PUTS("dax=always"); > + else > + SEQ_OPTS_PUTS("dax=inode"); dax=inode is the default; do you need to show it? (Especially since xfs doesn't...) --D > + > ext4_show_quota_options(seq, sb); > return 0; > } > @@ -5425,10 +5454,12 @@ static int ext4_remount(struct super_block *sb, int *flags, char *data) > goto restore_opts; > } > > - if ((sbi->s_mount_opt ^ old_opts.s_mount_opt) & EXT4_MOUNT_DAX_ALWAYS) { > + if ((sbi->s_mount_opt ^ old_opts.s_mount_opt) & EXT4_MOUNT_DAX_ALWAYS || > + (sbi->s_mount_opt2 ^ old_opts.s_mount_opt2) & EXT4_MOUNT2_DAX_NEVER) { > ext4_msg(sb, KERN_WARNING, "warning: refusing change of " > - "dax flag with busy inodes while remounting"); > + "dax mount option with busy inodes while remounting"); > sbi->s_mount_opt ^= EXT4_MOUNT_DAX_ALWAYS; > + sbi->s_mount_opt2 ^= EXT4_MOUNT2_DAX_NEVER; > } > > if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) > -- > 2.25.1 >