linux-kernel - Re: [PATCH 17/17] fs/ubifs: remove unnecessary new_valid

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Date:	Mon, 28 Sep 2015 21:20:32 +0200
From:	Richard Weinberger <richard.weinberger@...il.com>
To:	Yaowei Bai <bywxiaobai@....com>
Cc:	Al Viro <viro@...iv.linux.org.uk>,
	Artem Bityutskiy <dedekind1@...il.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	"linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 17/17] fs/ubifs: remove unnecessary new_valid_dev check

On Mon, Sep 28, 2015 at 4:53 PM, Yaowei Bai <bywxiaobai@....com> wrote:
> As new_valid_dev always returns 1, so new_valid_dev check is not
> needed, remove it.
>
> Signed-off-by: Yaowei Bai <bywxiaobai@....com>
> ---
>  fs/ubifs/dir.c  | 3 ---
>  fs/ubifs/misc.h | 9 ++-------
>  2 files changed, 2 insertions(+), 10 deletions(-)
>
> diff --git a/fs/ubifs/dir.c b/fs/ubifs/dir.c
> index 5c27c66..1dd9267 100644
> --- a/fs/ubifs/dir.c
> +++ b/fs/ubifs/dir.c
> @@ -787,9 +787,6 @@ static int ubifs_mknod(struct inode *dir, struct dentry *dentry,
>
>         dbg_gen("dent '%pd' in dir ino %lu", dentry, dir->i_ino);
>
> -       if (!new_valid_dev(rdev))
> -               return -EINVAL;
> -
>         if (S_ISBLK(mode) || S_ISCHR(mode)) {
>                 dev = kmalloc(sizeof(union ubifs_dev_desc), GFP_NOFS);
>                 if (!dev)
> diff --git a/fs/ubifs/misc.h b/fs/ubifs/misc.h
> index ee7cb5e..0197ed6 100644
> --- a/fs/ubifs/misc.h
> +++ b/fs/ubifs/misc.h
> @@ -155,13 +155,8 @@ static inline int ubifs_wbuf_sync(struct ubifs_wbuf *wbuf)
>   */
>  static inline int ubifs_encode_dev(union ubifs_dev_desc *dev, dev_t rdev)
>  {
> -       if (new_valid_dev(rdev)) {
> -               dev->new = cpu_to_le32(new_encode_dev(rdev));
> -               return sizeof(dev->new);
> -       } else {
> -               dev->huge = cpu_to_le64(huge_encode_dev(rdev));
> -               return sizeof(dev->huge);
> -       }
> +       dev->huge = cpu_to_le64(huge_encode_dev(rdev));
> +       return sizeof(dev->huge);

Please be careful.

dev->new = cpu_to_le32(new_encode_dev(rdev));
return sizeof(dev->huge);

...is the correct branch. You enabled the dead one.

-- 
Thanks,
//richard
--
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