Date:   Mon, 13 Apr 2020 12:46:10 -0700
From:   Ira Weiny <ira.weiny@...el.com>
To:     "Darrick J. Wong" <darrick.wong@...cle.com>
Cc:     linux-kernel@...r.kernel.org,
        Dan Williams <dan.j.williams@...el.com>,
        Dave Chinner <david@...morbit.com>,
        Christoph Hellwig <hch@....de>,
        "Theodore Y. Ts'o" <tytso@....edu>, Jan Kara <jack@...e.cz>,
        Jeff Moyer <jmoyer@...hat.com>, linux-ext4@...r.kernel.org,
        linux-xfs@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH V7 8/9] fs/xfs: Change xfs_ioctl_setattr_dax_invalidate()

On Mon, Apr 13, 2020 at 09:12:40AM -0700, Darrick J. Wong wrote:
> On Sun, Apr 12, 2020 at 10:40:45PM -0700, ira.weiny@...el.com wrote:
> > From: Ira Weiny <ira.weiny@...el.com>
> > 
> > We only support changing FS_XFLAG_DAX on directories.  Files get their
> > flag from the parent directory on creation only.  So no data
> > invalidation needs to happen.
> > 
> > Alter the xfs_ioctl_setattr_dax_invalidate() to be
> > xfs_ioctl_setattr_dax_validate().  xfs_ioctl_setattr_dax_validate() now
> > validates that any FS_XFLAG_DAX change is ok.
> > 
> > This also allows use to remove the join_flags logic.
> > 
> > Signed-off-by: Ira Weiny <ira.weiny@...el.com>
> > 
> > ---
> > Changes from v6:
> > 	Fix completely broken implementation and update commit message.
> > 	Use the new VFS layer I_DONTCACHE to facilitate inode eviction
> > 	and S_DAX changing on drop_caches
> > 
> > Changes from v5:
> > 	New patch
> > ---
> >  fs/xfs/xfs_ioctl.c | 102 +++++++--------------------------------------
> >  1 file changed, 16 insertions(+), 86 deletions(-)
> > 
> > diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c
> > index c6cd92ef4a05..ba42a5fb5b05 100644
> > --- a/fs/xfs/xfs_ioctl.c
> > +++ b/fs/xfs/xfs_ioctl.c
> > @@ -1145,63 +1145,23 @@ xfs_ioctl_setattr_xflags(
> >  }
> >  
> >  /*
> > - * If we are changing DAX flags, we have to ensure the file is clean and any
> > - * cached objects in the address space are invalidated and removed. This
> > - * requires us to lock out other IO and page faults similar to a truncate
> > - * operation. The locks need to be held until the transaction has been committed
> > - * so that the cache invalidation is atomic with respect to the DAX flag
> > - * manipulation.
> > + * Mark inodes with a changing FS_XFLAG_DAX, I_DONTCACHE
> >   */
> > -static int
> > +static void
> >  xfs_ioctl_setattr_dax_invalidate(
> >  	struct xfs_inode	*ip,
> > -	struct fsxattr		*fa,
> > -	int			*join_flags)
> > +	struct fsxattr		*fa)
> >  {
> > -	struct inode		*inode = VFS_I(ip);
> > -	struct super_block	*sb = inode->i_sb;
> > -	int			error;
> > -
> > -	*join_flags = 0;
> > -
> > -	/*
> > -	 * It is only valid to set the DAX flag on regular files and
> > -	 * directories on filesystems where the block size is equal to the page
> > -	 * size. On directories it serves as an inherited hint so we don't
> > -	 * have to check the device for dax support or flush pagecache.
> > -	 */
> > -	if (fa->fsx_xflags & FS_XFLAG_DAX) {
> > -		struct xfs_buftarg	*target = xfs_inode_buftarg(ip);
> > -
> > -		if (!bdev_dax_supported(target->bt_bdev, sb->s_blocksize))
> > -			return -EINVAL;
> > -	}
> > -
> > -	/* If the DAX state is not changing, we have nothing to do here. */
> > -	if ((fa->fsx_xflags & FS_XFLAG_DAX) && IS_DAX(inode))
> > -		return 0;
> > -	if (!(fa->fsx_xflags & FS_XFLAG_DAX) && !IS_DAX(inode))
> > -		return 0;
> > +	struct inode            *inode = VFS_I(ip);
> >  
> >  	if (S_ISDIR(inode->i_mode))
> > -		return 0;
> > -
> > -	/* lock, flush and invalidate mapping in preparation for flag change */
> > -	xfs_ilock(ip, XFS_MMAPLOCK_EXCL | XFS_IOLOCK_EXCL);
> > -	error = filemap_write_and_wait(inode->i_mapping);
> > -	if (error)
> > -		goto out_unlock;
> > -	error = invalidate_inode_pages2(inode->i_mapping);
> > -	if (error)
> > -		goto out_unlock;
> > -
> > -	*join_flags = XFS_MMAPLOCK_EXCL | XFS_IOLOCK_EXCL;
> > -	return 0;
> > -
> > -out_unlock:
> > -	xfs_iunlock(ip, XFS_MMAPLOCK_EXCL | XFS_IOLOCK_EXCL);
> > -	return error;
> > +		return;
> 
> We also need a check up here to skip the I_DONTCACHE setting if the
> admin has set a mount option to override the inode flag.

Yes that would be more optimal!

Thanks,
Ira

> 
> The rest looks good to me.
> 
> --D
> 
> > +	if (((fa->fsx_xflags & FS_XFLAG_DAX) &&
> > +	    !(ip->i_d.di_flags2 & XFS_DIFLAG2_DAX)) ||
> > +	    (!(fa->fsx_xflags & FS_XFLAG_DAX) &&
> > +	     (ip->i_d.di_flags2 & XFS_DIFLAG2_DAX)))
> > +		inode->i_state |= I_DONTCACHE;
> >  }
> >  
> >  /*
> > @@ -1209,17 +1169,10 @@ xfs_ioctl_setattr_dax_invalidate(
> >   * have permission to do so. On success, return a clean transaction and the
> >   * inode locked exclusively ready for further operation specific checks. On
> >   * failure, return an error without modifying or locking the inode.
> > - *
> > - * The inode might already be IO locked on call. If this is the case, it is
> > - * indicated in @join_flags and we take full responsibility for ensuring they
> > - * are unlocked from now on. Hence if we have an error here, we still have to
> > - * unlock them. Otherwise, once they are joined to the transaction, they will
> > - * be unlocked on commit/cancel.
> >   */
> >  static struct xfs_trans *
> >  xfs_ioctl_setattr_get_trans(
> > -	struct xfs_inode	*ip,
> > -	int			join_flags)
> > +	struct xfs_inode	*ip)
> >  {
> >  	struct xfs_mount	*mp = ip->i_mount;
> >  	struct xfs_trans	*tp;
> > @@ -1236,8 +1189,7 @@ xfs_ioctl_setattr_get_trans(
> >  		goto out_unlock;
> >  
> >  	xfs_ilock(ip, XFS_ILOCK_EXCL);
> > -	xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL | join_flags);
> > -	join_flags = 0;
> > +	xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
> >  
> >  	/*
> >  	 * CAP_FOWNER overrides the following restrictions:
> > @@ -1258,8 +1210,6 @@ xfs_ioctl_setattr_get_trans(
> >  out_cancel:
> >  	xfs_trans_cancel(tp);
> >  out_unlock:
> > -	if (join_flags)
> > -		xfs_iunlock(ip, join_flags);
> >  	return ERR_PTR(error);
> >  }
> >  
> > @@ -1386,7 +1336,6 @@ xfs_ioctl_setattr(
> >  	struct xfs_dquot	*pdqp = NULL;
> >  	struct xfs_dquot	*olddquot = NULL;
> >  	int			code;
> > -	int			join_flags = 0;
> >  
> >  	trace_xfs_ioctl_setattr(ip);
> >  
> > @@ -1410,18 +1359,9 @@ xfs_ioctl_setattr(
> >  			return code;
> >  	}
> >  
> > -	/*
> > -	 * Changing DAX config may require inode locking for mapping
> > -	 * invalidation. These need to be held all the way to transaction commit
> > -	 * or cancel time, so need to be passed through to
> > -	 * xfs_ioctl_setattr_get_trans() so it can apply them to the join call
> > -	 * appropriately.
> > -	 */
> > -	code = xfs_ioctl_setattr_dax_invalidate(ip, fa, &join_flags);
> > -	if (code)
> > -		goto error_free_dquots;
> > +	xfs_ioctl_setattr_dax_invalidate(ip, fa);
> >  
> > -	tp = xfs_ioctl_setattr_get_trans(ip, join_flags);
> > +	tp = xfs_ioctl_setattr_get_trans(ip);
> >  	if (IS_ERR(tp)) {
> >  		code = PTR_ERR(tp);
> >  		goto error_free_dquots;
> > @@ -1552,7 +1492,6 @@ xfs_ioc_setxflags(
> >  	struct fsxattr		fa;
> >  	struct fsxattr		old_fa;
> >  	unsigned int		flags;
> > -	int			join_flags = 0;
> >  	int			error;
> >  
> >  	if (copy_from_user(&flags, arg, sizeof(flags)))
> > @@ -1569,18 +1508,9 @@ xfs_ioc_setxflags(
> >  	if (error)
> >  		return error;
> >  
> > -	/*
> > -	 * Changing DAX config may require inode locking for mapping
> > -	 * invalidation. These need to be held all the way to transaction commit
> > -	 * or cancel time, so need to be passed through to
> > -	 * xfs_ioctl_setattr_get_trans() so it can apply them to the join call
> > -	 * appropriately.
> > -	 */
> > -	error = xfs_ioctl_setattr_dax_invalidate(ip, &fa, &join_flags);
> > -	if (error)
> > -		goto out_drop_write;
> > +	xfs_ioctl_setattr_dax_invalidate(ip, &fa);
> >  
> > -	tp = xfs_ioctl_setattr_get_trans(ip, join_flags);
> > +	tp = xfs_ioctl_setattr_get_trans(ip);
> >  	if (IS_ERR(tp)) {
> >  		error = PTR_ERR(tp);
> >  		goto out_drop_write;
> > -- 
> > 2.25.1
> > 

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