Re: [PATCH 3/3] f2fs: remove redundant check from f2fs_setflags_common()

["Darrick J. Wong" <darrick.wong@oracle.com>]

On Mon, Jul 01, 2019 at 01:26:30PM -0700, Eric Biggers wrote:
> From: Eric Biggers <ebiggers@google.com>
> 
> Now that f2fs_ioc_setflags() and f2fs_ioc_fssetxattr() call the VFS
> helper functions which check for permission to change the immutable and
> append-only flags, it's no longer needed to do this check in
> f2fs_setflags_common() too.  So remove it.
> 
> This is based on a patch from Darrick Wong, but reworked to apply after
> commit 360985573b55 ("f2fs: separate f2fs i_flags from fs_flags and ext4
> i_flags").
> 
> Originally-from: Darrick J. Wong <darrick.wong@oracle.com>
> Signed-off-by: Eric Biggers <ebiggers@google.com>

Looks ok,
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>

--D

> ---
>  fs/f2fs/file.c | 9 +--------
>  1 file changed, 1 insertion(+), 8 deletions(-)
> 
> diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
> index ae1a54ecc9fccc..e8b81f6f5c2b15 100644
> --- a/fs/f2fs/file.c
> +++ b/fs/f2fs/file.c
> @@ -1648,19 +1648,12 @@ static int f2fs_file_flush(struct file *file, fl_owner_t id)
>  static int f2fs_setflags_common(struct inode *inode, u32 iflags, u32 mask)
>  {
>  	struct f2fs_inode_info *fi = F2FS_I(inode);
> -	u32 oldflags;
>  
>  	/* Is it quota file? Do not allow user to mess with it */
>  	if (IS_NOQUOTA(inode))
>  		return -EPERM;
>  
> -	oldflags = fi->i_flags;
> -
> -	if ((iflags ^ oldflags) & (F2FS_APPEND_FL | F2FS_IMMUTABLE_FL))
> -		if (!capable(CAP_LINUX_IMMUTABLE))
> -			return -EPERM;
> -
> -	fi->i_flags = iflags | (oldflags & ~mask);
> +	fi->i_flags = iflags | (fi->i_flags & ~mask);
>  
>  	if (fi->i_flags & F2FS_PROJINHERIT_FL)
>  		set_inode_flag(inode, FI_PROJ_INHERIT);
> -- 
> 2.22.0.410.gd8fdbe21b5-goog
>