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Subject: Re: [PATCH 2/6] statfs: use << to align with fs header
To:     Christian Brauner <christian.brauner@ubuntu.com>,
        viro@zeniv.linux.org.uk, tglx@linutronix.de,
        kstewart@linuxfoundation.org, gregkh@linuxfoundation.org,
        pombredanne@nexb.com, linux-fsdevel@vger.kernel.org,
        linux-kernel@vger.kernel.org, serge@hallyn.com
References: <20180413161126.31313-1-christian.brauner@ubuntu.com>
 <20180413161126.31313-3-christian.brauner@ubuntu.com>
From:   Randy Dunlap <rdunlap@infradead.org>
Message-ID: <f526b1d7-4240-5617-f185-3b751ace0982@infradead.org>
Date:   Fri, 13 Apr 2018 09:47:47 -0700
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On 04/13/2018 09:11 AM, Christian Brauner wrote:
> Consistenly use << to define ST_* constants. This also aligns them with
> their MS_* counterparts in fs.h
> 
> Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
> ---
>  include/linux/statfs.h | 26 +++++++++++++-------------
>  1 file changed, 13 insertions(+), 13 deletions(-)

Lots of opportunities to use BIT(n) macro.
Is there some reason not to do that?


> diff --git a/include/linux/statfs.h b/include/linux/statfs.h
> index 3142e98546ac..b336c04e793c 100644
> --- a/include/linux/statfs.h
> +++ b/include/linux/statfs.h
> @@ -27,18 +27,18 @@ struct kstatfs {
>   * ABI.  The exception is ST_VALID which has the same value as MS_REMOUNT
>   * which doesn't make any sense for statfs.
>   */
> -#define ST_RDONLY	0x0001	/* mount read-only */
> -#define ST_NOSUID	0x0002	/* ignore suid and sgid bits */
> -#define ST_NODEV	0x0004	/* disallow access to device special files */
> -#define ST_NOEXEC	0x0008	/* disallow program execution */
> -#define ST_SYNCHRONOUS	0x0010	/* writes are synced at once */
> -#define ST_VALID	0x0020	/* f_flags support is implemented */
> -#define ST_MANDLOCK	0x0040	/* allow mandatory locks on an FS */
> -/* 0x0080 used for ST_WRITE in glibc */
> -/* 0x0100 used for ST_APPEND in glibc */
> -/* 0x0200 used for ST_IMMUTABLE in glibc */
> -#define ST_NOATIME	0x0400	/* do not update access times */
> -#define ST_NODIRATIME	0x0800	/* do not update directory access times */
> -#define ST_RELATIME	0x1000	/* update atime relative to mtime/ctime */
> +#define ST_RDONLY	(1<<0) /* mount read-only */
> +#define ST_NOSUID	(1<<1) /* ignore suid and sgid bits */
> +#define ST_NODEV	(1<<2) /* disallow access to device special files */
> +#define ST_NOEXEC	(1<<3) /* disallow program execution */
> +#define ST_SYNCHRONOUS	(1<<4) /* writes are synced at once */
> +#define ST_VALID	(1<<5) /* f_flags support is implemented */
> +#define ST_MANDLOCK	(1<<6) /* allow mandatory locks on an FS */
> +/* (1<<7) used for ST_WRITE in glibc */
> +/* (1<<8) used for ST_APPEND in glibc */
> +/* (1<<9) used for ST_IMMUTABLE in glibc */
> +#define ST_NOATIME	(1<<10) /* do not update access times */
> +#define ST_NODIRATIME	(1<<11) /* do not update directory access times */
> +#define ST_RELATIME	(1<<12) /* update atime relative to mtime/ctime */
>  
>  #endif
> 


-- 
~Randy