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From: Ira Weiny <ira.weiny@intel.com>
To: Jan Kara <jack@suse.cz>
Cc: linux-kernel@vger.kernel.org,
	"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 3/8] fs/ext4: Disallow encryption if inode is DAX
Date: Wed, 15 Apr 2020 13:35:44 -0700	[thread overview]
Message-ID: <20200415203544.GC2309605@iweiny-DESK2.sc.intel.com> (raw)
In-Reply-To: <20200415120241.GF6126@quack2.suse.cz>

On Wed, Apr 15, 2020 at 02:02:41PM +0200, Jan Kara wrote:
> On Mon 13-04-20 21:00:25, ira.weiny@intel.com wrote:
> > From: Ira Weiny <ira.weiny@intel.com>
> > 
> > Encryption and DAX are incompatible.  Changing the DAX mode due to a
> > change in Encryption mode is wrong without a corresponding
> > address_space_operations update.
> > 
> > Make the 2 options mutually exclusive by returning an error if DAX was
> > set first.
> > 
> > Signed-off-by: Ira Weiny <ira.weiny@intel.com>
> > ---
> >  fs/ext4/super.c | 10 +---------
> >  1 file changed, 1 insertion(+), 9 deletions(-)
> > 
> > diff --git a/fs/ext4/super.c b/fs/ext4/super.c
> > index 0c7c4adb664e..b14863058115 100644
> > --- a/fs/ext4/super.c
> > +++ b/fs/ext4/super.c
> > @@ -1325,7 +1325,7 @@ static int ext4_set_context(struct inode *inode, const void *ctx, size_t len,
> >  	if (inode->i_ino == EXT4_ROOT_INO)
> >  		return -EPERM;
> >  
> > -	if (WARN_ON_ONCE(IS_DAX(inode) && i_size_read(inode)))
> > +	if (WARN_ON_ONCE(IS_DAX(inode)))
> 
> Also here I don't think WARN_ON_ONCE() is warranted once we allow per-inode
> setting of DAX. It will then become a regular error condition...

Removed.
Ira

> 
> 								Honza
> 
> >  		return -EINVAL;
> >  
> >  	res = ext4_convert_inline_data(inode);
> > @@ -1349,10 +1349,6 @@ static int ext4_set_context(struct inode *inode, const void *ctx, size_t len,
> >  			ext4_set_inode_flag(inode, EXT4_INODE_ENCRYPT);
> >  			ext4_clear_inode_state(inode,
> >  					EXT4_STATE_MAY_INLINE_DATA);
> > -			/*
> > -			 * Update inode->i_flags - S_ENCRYPTED will be enabled,
> > -			 * S_DAX may be disabled
> > -			 */
> >  			ext4_set_inode_flags(inode);
> >  		}
> >  		return res;
> > @@ -1376,10 +1372,6 @@ static int ext4_set_context(struct inode *inode, const void *ctx, size_t len,
> >  				    ctx, len, 0);
> >  	if (!res) {
> >  		ext4_set_inode_flag(inode, EXT4_INODE_ENCRYPT);
> > -		/*
> > -		 * Update inode->i_flags - S_ENCRYPTED will be enabled,
> > -		 * S_DAX may be disabled
> > -		 */
> >  		ext4_set_inode_flags(inode);
> >  		res = ext4_mark_inode_dirty(handle, inode);
> >  		if (res)
> > -- 
> > 2.25.1
> > 
> -- 
> Jan Kara <jack@suse.com>
> SUSE Labs, CR

  reply	other threads:[~2020-04-15 20:36 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 [this message]
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
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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