linux-kernel - Re: [PATCH v3 1/5] erofs: introduce erofs_xattr_iter_fixup

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Message-ID: <77ed16d5-4e75-0d9d-5a11-0d26573f8b9c@linux.alibaba.com>
Date:   Tue, 30 May 2023 11:47:18 +0800
From:   Gao Xiang <hsiangkao@...ux.alibaba.com>
To:     Jingbo Xu <jefflexu@...ux.alibaba.com>, xiang@...nel.org,
        chao@...nel.org, huyue2@...lpad.com, linux-erofs@...ts.ozlabs.org
Cc:     linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/5] erofs: introduce erofs_xattr_iter_fixup_aligned()
 helper



On 2023/5/30 11:42, Jingbo Xu wrote:
> 
> 
> On 5/29/23 3:41 PM, Gao Xiang wrote:
>> Hi,
>>
>> On 2023/5/18 10:45, Jingbo Xu wrote:
>>> Introduce erofs_xattr_iter_fixup_aligned() helper where
>>> it.ofs <= EROFS_BLKSIZ is mandatory.
>>>
>>> Signed-off-by: Jingbo Xu <jefflexu@...ux.alibaba.com>
>>> ---
>>>    fs/erofs/xattr.c | 79 +++++++++++++++++++++---------------------------
>>>    1 file changed, 35 insertions(+), 44 deletions(-)
>>>
>>> diff --git a/fs/erofs/xattr.c b/fs/erofs/xattr.c
>>> index bbfe7ce170d2..b79be2a556ba 100644
>>> --- a/fs/erofs/xattr.c
>>> +++ b/fs/erofs/xattr.c
>>> @@ -29,6 +29,28 @@ struct xattr_iter {
>>>        unsigned int ofs;
>>>    };
>>>    +static inline int erofs_xattr_iter_fixup(struct xattr_iter *it)
>>> +{
>>> +    if (it->ofs < it->sb->s_blocksize)
>>> +        return 0;
>>> +
>>> +    it->blkaddr += erofs_blknr(it->sb, it->ofs);
>>> +    it->kaddr = erofs_read_metabuf(&it->buf, it->sb, it->blkaddr,
>>> EROFS_KMAP);
>>
>> could we use a new buf interface to init_metabuf at once?
> 
> As discussed offline, I think the following unified API is preferred:
> 
> ```
> int erofs_xattr_iter_fixup(struct xattr_iter *it, bool nospan)
> 
> {
>      if (it->ofs < it->sb->s_blocksize)
>          return 0;
> 
>      if (nospan && it->ofs != it->sb->s_blocksize) {
> 	DBG_BUGON(1);
> 	return -EFSCORRUPTED;
>      }
> 
>      ...
> }
> ```

Yeah, could you send the next version for this?

Thanks,
Gao Xiang

>