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From: Jan Kara <jack@suse.cz>
To: ira.weiny@intel.com
Cc: linux-kernel@vger.kernel.org, Jan Kara <jack@suse.cz>,
	"Darrick J. Wong" <darrick.wong@oracle.com>,
	Dan Williams <dan.j.williams@intel.com>,
	Dave Chinner <david@fromorbit.com>,
	Christoph Hellwig <hch@lst.de>,
	"Theodore Y. Ts'o" <tytso@mit.edu>,
	Jeff Moyer <jmoyer@redhat.com>,
	linux-ext4@vger.kernel.org, linux-xfs@vger.kernel.org,
	linux-fsdevel@vger.kernel.org
Subject: Re: [PATCH RFC 5/8] fs/ext4: Make DAX mount option a tri-state
Date: Wed, 15 Apr 2020 14:51:47 +0200	[thread overview]
Message-ID: <20200415125147.GH6126@quack2.suse.cz> (raw)
In-Reply-To: <20200414040030.1802884-6-ira.weiny@intel.com>

On Mon 13-04-20 21:00:27, ira.weiny@intel.com wrote:
> From: Ira Weiny <ira.weiny@intel.com>
> 
> We add 'always', 'never', and 'inode' (default).  '-o dax' continue to
> operate the same.
> 
> Specifically we introduce a 2nd DAX mount flag EXT4_MOUNT_NODAX and set
> it and EXT4_MOUNT_DAX appropriately.
> 
> We also force EXT4_MOUNT_NODAX if !CONFIG_FS_DAX.
> 
> https://lore.kernel.org/lkml/20200405061945.GA94792@iweiny-DESK2.sc.intel.com/
> 
> Signed-off-by: Ira Weiny <ira.weiny@intel.com>

...

> @@ -2303,6 +2325,13 @@ 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, NODAX))
> +		SEQ_OPTS_PUTS("dax=never");
> +	else if (test_opt(sb, DAX))
> +		SEQ_OPTS_PUTS("dax=always");
> +	else
> +		SEQ_OPTS_PUTS("dax=inode");
> +

We try to show only mount options that were explicitely set by the user, or
that are different from defaults - e.g., see how 'data=' mount option
printing is handled.

>  	ext4_show_quota_options(seq, sb);
>  	return 0;
>  }
> @@ -5424,6 +5453,12 @@ static int ext4_remount(struct super_block *sb, int *flags, char *data)
>  		sbi->s_mount_opt ^= EXT4_MOUNT_DAX;
>  	}
>  
> +	if ((sbi->s_mount_opt2 ^ old_opts.s_mount_opt2) & EXT4_MOUNT2_NODAX) {
> +		ext4_msg(sb, KERN_WARNING, "warning: refusing change of "
> +			"non-dax flag with busy inodes while remounting");
> +		sbi->s_mount_opt2 ^= EXT4_MOUNT2_NODAX;
> +	}
> +
>  	if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
>  		ext4_abort(sb, "Abort forced by user");

I'd just merge this with the check whether EXT4_MOUNT_DAX changed.

								Honza

-- 
Jan Kara <jack@suse.com>
SUSE Labs, CR

  reply	other threads:[~2020-04-15 12:52 UTC|newest]

Thread overview: 42+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-04-14  4:00 [PATCH RFC 0/8] Enable ext4 support for per-file/directory DAX operations ira.weiny
2020-04-14  4:00 ` [PATCH RFC 1/8] fs/ext4: Narrow scope of DAX check in setflags ira.weiny
2020-04-15 11:45   ` Jan Kara
2020-04-14  4:00 ` [PATCH RFC 2/8] fs/ext4: Disallow verity if inode is DAX ira.weiny
2020-04-15 11:58   ` Jan Kara
2020-04-15 12:00   ` Jan Kara
2020-04-15 15:55     ` Theodore Y. Ts'o
2020-04-15 19:21       ` Ira Weiny
2020-04-15 19:14     ` Ira Weiny
2020-04-16  1:29       ` Eric Biggers
2020-04-16  3:48         ` Ira Weiny
2020-04-15 20:34     ` Ira Weiny
2020-04-14  4:00 ` [PATCH RFC 3/8] fs/ext4: Disallow encryption " ira.weiny
2020-04-15 12:02   ` Jan Kara
2020-04-15 20:35     ` Ira Weiny
2020-04-15 16:03   ` Theodore Y. Ts'o
2020-04-15 17:27     ` Dan Williams
2020-04-15 19:54     ` Ira Weiny
2020-04-21 18:41       ` Ira Weiny
2020-04-21 18:56         ` Darrick J. Wong
2020-04-14  4:00 ` [PATCH RFC 4/8] fs/ext4: Introduce DAX inode flag ira.weiny
2020-04-15 12:08   ` Jan Kara
2020-04-15 20:39     ` Ira Weiny
2020-04-16 10:32       ` Jan Kara
2020-04-16 18:01       ` Theodore Y. Ts'o
2020-04-16 16:25   ` Darrick J. Wong
2020-04-16 22:33     ` Ira Weiny
2020-04-16 22:49       ` Darrick J. Wong
2020-04-17  0:37         ` Ira Weiny
2020-04-17  1:57           ` Darrick J. Wong
2020-04-17  2:20             ` Ira Weiny
2020-04-17  6:43               ` Andreas Dilger
2020-04-17 17:19                 ` Ira Weiny
2020-04-14  4:00 ` [PATCH RFC 5/8] fs/ext4: Make DAX mount option a tri-state ira.weiny
2020-04-15 12:51   ` Jan Kara [this message]
2020-04-14  4:00 ` [PATCH RFC 6/8] fs/ext4: Update ext4_should_use_dax() ira.weiny
2020-04-15 13:58   ` Jan Kara
2020-04-17 17:16     ` Ira Weiny
2020-04-14  4:00 ` [PATCH RFC 7/8] fs/ext4: Only change S_DAX on inode load ira.weiny
2020-04-15 14:03   ` Jan Kara
2020-04-17 17:18     ` Ira Weiny
2020-04-14  4:00 ` [PATCH RFC 8/8] Documentation/dax: Update DAX enablement for ext4 ira.weiny

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