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 6/8] fs/ext4: Update ext4_should_use_dax()
Date: Wed, 15 Apr 2020 15:58:34 +0200 [thread overview]
Message-ID: <20200415135834.GI6126@quack2.suse.cz> (raw)
In-Reply-To: <20200414040030.1802884-7-ira.weiny@intel.com>
On Mon 13-04-20 21:00:28, ira.weiny@intel.com wrote:
> From: Ira Weiny <ira.weiny@intel.com>
>
> Change the logic of ext4_should_use_dax() to support using the inode dax
> flag OR the overriding tri-state mount option.
>
> While we are at it change the function to ext4_enable_dax() as this
> better reflects the ask.
I disagree with the renaming. ext4_enable_dax() suggests it enables
something. It does not. I'd either leave ext4_should_use_dax() or maybe
change it to ext4_should_enable_dax() if you really like the "enable" word
:).
>
> Signed-off-by: Ira Weiny <ira.weiny@intel.com>
> ---
> fs/ext4/inode.c | 16 ++++++++++++----
> 1 file changed, 12 insertions(+), 4 deletions(-)
>
> diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
> index fa0ff78dc033..e9d582e516bc 100644
> --- a/fs/ext4/inode.c
> +++ b/fs/ext4/inode.c
> @@ -4383,9 +4383,11 @@ int ext4_get_inode_loc(struct inode *inode, struct ext4_iloc *iloc)
> !ext4_test_inode_state(inode, EXT4_STATE_XATTR));
> }
>
> -static bool ext4_should_use_dax(struct inode *inode)
> +static bool ext4_enable_dax(struct inode *inode)
> {
> - if (!test_opt(inode->i_sb, DAX))
> + unsigned int flags = EXT4_I(inode)->i_flags;
> +
> + if (test_opt2(inode->i_sb, NODAX))
> return false;
> if (!S_ISREG(inode->i_mode))
> return false;
> @@ -4397,7 +4399,13 @@ static bool ext4_should_use_dax(struct inode *inode)
> return false;
> if (ext4_test_inode_flag(inode, EXT4_INODE_VERITY))
> return false;
> - return true;
> + if (!bdev_dax_supported(inode->i_sb->s_bdev,
> + inode->i_sb->s_blocksize))
> + return false;
> + if (test_opt(inode->i_sb, DAX))
> + return true;
> +
> + return (flags & EXT4_DAX_FL) == EXT4_DAX_FL;
flags & EXT4_DAX_FL is enough here, isn't it?
Honza
> }
>
> void ext4_set_inode_flags(struct inode *inode)
> @@ -4415,7 +4423,7 @@ void ext4_set_inode_flags(struct inode *inode)
> new_fl |= S_NOATIME;
> if (flags & EXT4_DIRSYNC_FL)
> new_fl |= S_DIRSYNC;
> - if (ext4_should_use_dax(inode))
> + if (ext4_enable_dax(inode))
> new_fl |= S_DAX;
> if (flags & EXT4_ENCRYPT_FL)
> new_fl |= S_ENCRYPTED;
> --
> 2.25.1
>
--
Jan Kara <jack@suse.com>
SUSE Labs, CR
next prev parent reply other threads:[~2020-04-15 13:58 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
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 [this message]
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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