Re: [PATCH v2 3/4] xfs: allow setting xattrs on special files

["Darrick J. Wong" <djwong@kernel.org>]

On Mon, May 20, 2024 at 06:46:22PM +0200, Andrey Albershteyn wrote:
> As XFS didn't have ioctls for special files setting an inode
> extended attributes was rejected for them in xfs_fileattr_set().
> Same applies for reading.
> 
> With XFS's project quota directories this is necessary. When project
> is setup, xfs_quota opens and calls FS_IOC_SETFSXATTR on every inode
> in the directory. However, special files are skipped due to open()
> returning a special inode for them. So, they don't even get to this
> check.
> 
> The FS_IOC_FS[SET|GET]XATTRAT will call xfs_fileattr_set/get() on a
> special file. Therefore, allow them to work on special inodes.
> 
> Signed-off-by: Andrey Albershteyn <aalbersh@redhat.com>

Looks ok,
Reviewed-by: Darrick J. Wong <djwong@kernel.org>

--D

> ---
>  fs/xfs/xfs_ioctl.c | 6 ------
>  1 file changed, 6 deletions(-)
> 
> diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c
> index f0117188f302..adedfcd3fde5 100644
> --- a/fs/xfs/xfs_ioctl.c
> +++ b/fs/xfs/xfs_ioctl.c
> @@ -459,9 +459,6 @@ xfs_fileattr_get(
>  {
>  	struct xfs_inode	*ip = XFS_I(d_inode(dentry));
>  
> -	if (d_is_special(dentry))
> -		return -ENOTTY;
> -
>  	xfs_ilock(ip, XFS_ILOCK_SHARED);
>  	xfs_fill_fsxattr(ip, XFS_DATA_FORK, fa);
>  	xfs_iunlock(ip, XFS_ILOCK_SHARED);
> @@ -736,9 +733,6 @@ xfs_fileattr_set(
>  
>  	trace_xfs_ioctl_setattr(ip);
>  
> -	if (d_is_special(dentry))
> -		return -ENOTTY;
> -
>  	if (!fa->fsx_valid) {
>  		if (fa->flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL |
>  				  FS_NOATIME_FL | FS_NODUMP_FL |
> -- 
> 2.42.0
> 
>