linux-kernel - Re: [PATCH] ceph: remove unnecessary check for NULL in parse

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Date:   Fri, 8 Sep 2023 08:14:19 +0800
From:   Xiubo Li <xiubli@...hat.com>
To:     Luís Henriques <lhenriques@...e.de>,
        Ilya Dryomov <idryomov@...il.com>,
        Jeff Layton <jlayton@...nel.org>,
        Milind Changire <mchangir@...hat.com>
Cc:     ceph-devel@...r.kernel.org, linux-kernel@...r.kernel.org,
        Dan Carpenter <dan.carpenter@...aro.org>
Subject: Re: [PATCH] ceph: remove unnecessary check for NULL in
 parse_longname()


On 9/7/23 21:39, Luís Henriques wrote:
> Function ceph_get_inode() never returns NULL; instead it returns an
> ERR_PTR() if something fails.  Thus, the check for NULL in
> parse_longname() useless and can be dropped.
>
> Fixes: dd66df0053ef ("ceph: add support for encrypted snapshot names")
> Reported-by: Dan Carpenter <dan.carpenter@...aro.org>
> Signed-off-by: Luís Henriques <lhenriques@...e.de>
> ---
>   fs/ceph/crypto.c | 2 --
>   1 file changed, 2 deletions(-)
>
> diff --git a/fs/ceph/crypto.c b/fs/ceph/crypto.c
> index e4d5cd56a80b..7d0b9b5ccfc6 100644
> --- a/fs/ceph/crypto.c
> +++ b/fs/ceph/crypto.c
> @@ -249,8 +249,6 @@ static struct inode *parse_longname(const struct inode *parent,
>   	if (!dir) {
>   		/* This can happen if we're not mounting cephfs on the root */
>   		dir = ceph_get_inode(parent->i_sb, vino, NULL);
> -		if (!dir)
> -			dir = ERR_PTR(-ENOENT);
>   	}
>   	if (IS_ERR(dir))
>   		dout("Can't find inode %s (%s)\n", inode_number, name);
>
Luis,

How about moving the error check into the  'if (!dir) {}' ? Because from 
'ceph_find_inode()' the return value shouldn't be true here. This err 
check should for 'ceph_get_inode()' only.

Thanks

- Xiubo