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

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Date:   Fri, 08 Sep 2023 09:39:29 +0100
From:   Luís Henriques <lhenriques@...e.de>
To:     Xiubo Li <xiubli@...hat.com>
Cc:     Ilya Dryomov <idryomov@...il.com>,
        Jeff Layton <jlayton@...nel.org>,
        Milind Changire <mchangir@...hat.com>,
        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()

Xiubo Li <xiubli@...hat.com> writes:

> 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.

Yeah, you're right.  Thanks, Xiubo.  I'll send out v2 shortly.

Cheers,
-- 
Luís