linux-kernel - Re: [External] Re: [PATCH V2 3/5] erofs: add 'domain

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Date:   Tue, 13 Sep 2022 12:35:58 +0800
From:   Jia Zhu <zhujia.zj@...edance.com>
To:     JeffleXu <jefflexu@...ux.alibaba.com>,
        linux-erofs@...ts.ozlabs.org, xiang@...nel.org, chao@...nel.org
Cc:     linux-fsdevel@...r.kernel.org, huyue2@...lpad.com,
        linux-kernel@...r.kernel.org, yinxin.x@...edance.com
Subject: Re: [External] Re: [PATCH V2 3/5] erofs: add 'domain_id' prefix when
 register sysfs



在 2022/9/9 17:26, JeffleXu 写道:
> 
> 
> On 9/9/22 5:23 PM, JeffleXu wrote:
>>
>>
>> On 9/2/22 6:53 PM, Jia Zhu wrote:
>>> In shared domain mount procedure, add 'domain_id' prefix to register
>>> sysfs entry. Thus we could distinguish mounts that don't use shared
>>> domain.
>>>
>>> Signed-off-by: Jia Zhu <zhujia.zj@...edance.com>
>>> ---
>>>   fs/erofs/sysfs.c | 11 ++++++++++-
>>>   1 file changed, 10 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/fs/erofs/sysfs.c b/fs/erofs/sysfs.c
>>> index c1383e508bbe..c0031d7bd817 100644
>>> --- a/fs/erofs/sysfs.c
>>> +++ b/fs/erofs/sysfs.c
>>> @@ -201,12 +201,21 @@ static struct kobject erofs_feat = {
>>>   int erofs_register_sysfs(struct super_block *sb)
>>>   {
>>>   	struct erofs_sb_info *sbi = EROFS_SB(sb);
>>> +	char *name = NULL;
>>>   	int err;
>>>   
>>> +	if (erofs_is_fscache_mode(sb)) {
>>> +		name = kasprintf(GFP_KERNEL, "%s%s%s", sbi->opt.domain_id ?
>>> +				sbi->opt.domain_id : "", sbi->opt.domain_id ? "," : "",
>>> +				sbi->opt.fsid);
>>> +		if (!name)
>>> +			return -ENOMEM;
>>> +	}
>>
>>
>> How about:
>>
>> name = erofs_is_fscache_mode(sb) ? sbi->opt.fsid : sb->s_id;
>> if (sbi->opt.domain_id) {
>> 	str = kasprintf(GFP_KERNEL, "%s,%s", sbi->opt.domain_id, sbi->opt.fsid);
>> 	name = str;
>> }
> 
> Another choice:
> 
> if (erofs_is_fscache_mode(sb)) {
> 	if (sbi->opt.domain_id) {
> 		str = kasprintf(GFP_KERNEL, "%s,%s", sbi->opt.domain_id, sbi->opt.fsid);
> 		name = str;
> 	} else {
> 		name = sbi->opt.fsid;
> 	}
> } else {
> 	name = sb->s_id;
> }
> 
> 
Thanks for your advise, this version looks more intuitive. I'll apply it
in next version.
> 
> 
>>
>>
>>>   	sbi->s_kobj.kset = &erofs_root;
>>>   	init_completion(&sbi->s_kobj_unregister);
>>>   	err = kobject_init_and_add(&sbi->s_kobj, &erofs_sb_ktype, NULL, "%s",
>>> -			erofs_is_fscache_mode(sb) ? sbi->opt.fsid : sb->s_id);
>>> +			name ? name : sb->s_id);
>>
>> 	kobject_init_and_add(..., "%s", name);
>> 	kfree(str);
>>
>> though it's still not such straightforward...
>>
>> Any better idea?
>>
>>
>>> +	kfree(name);
>>>   	if (err)
>>>   		goto put_sb_kobj;
>>>   	return 0;
>>
>