[PATCH] staging: erofs: don't check special inode layout

[PATCH] staging: erofs: don't check special inode layout

[Yue Hu]

From: Yue Hu <huyue2@yulong.com>

Currently, we will check if inode layout is compression or inline if
the inode is special in fill_inode(). Also set ->i_mapping->a_ops for
it. That is pointless since the both modes won't be set for special
inode when creating EROFS filesystem image. So, let's avoid it.

Signed-off-by: Yue Hu <huyue2@yulong.com>
---
 drivers/staging/erofs/inode.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/staging/erofs/inode.c b/drivers/staging/erofs/inode.c
index 1433f25..2fe0f6d 100644
--- a/drivers/staging/erofs/inode.c
+++ b/drivers/staging/erofs/inode.c
@@ -205,6 +205,7 @@ static int fill_inode(struct inode *inode, int isdir)
 			S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) {
 			inode->i_op = &erofs_generic_iops;
 			init_special_inode(inode, inode->i_mode, inode->i_rdev);
+			goto out_unlock;
 		} else {
 			err = -EIO;
 			goto out_unlock;
-- 
1.9.1

Re: [PATCH] staging: erofs: don't check special inode layout

[Gao Xiang]

Hi Yue,

On 2019/6/28 11:42, Yue Hu wrote:
> From: Yue Hu <huyue2@yulong.com>
> 
> Currently, we will check if inode layout is compression or inline if
> the inode is special in fill_inode(). Also set ->i_mapping->a_ops for
> it. That is pointless since the both modes won't be set for special
> inode when creating EROFS filesystem image. So, let's avoid it.
> 
> Signed-off-by: Yue Hu <huyue2@yulong.com>

Have you test this patch with some actual image with legacy mkfs since
new mkfs framework have not supported special inode...

I think that is fine in priciple, however, in case to introduce some potential
issues, I will test this patch later. I will give a Reviewed-by tag after I tested
this patch.

Thanks,
Gao Xiang

> ---
>  drivers/staging/erofs/inode.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/staging/erofs/inode.c b/drivers/staging/erofs/inode.c
> index 1433f25..2fe0f6d 100644
> --- a/drivers/staging/erofs/inode.c
> +++ b/drivers/staging/erofs/inode.c
> @@ -205,6 +205,7 @@ static int fill_inode(struct inode *inode, int isdir)
>  			S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) {
>  			inode->i_op = &erofs_generic_iops;
>  			init_special_inode(inode, inode->i_mode, inode->i_rdev);
> +			goto out_unlock;
>  		} else {
>  			err = -EIO;
>  			goto out_unlock;
> 

Re: [PATCH] staging: erofs: don't check special inode layout

[Yue Hu]

On Fri, 28 Jun 2019 11:50:21 +0800
Gao Xiang <gaoxiang25@huawei.com> wrote:

> Hi Yue,
> 
> On 2019/6/28 11:42, Yue Hu wrote:
> > From: Yue Hu <huyue2@yulong.com>
> > 
> > Currently, we will check if inode layout is compression or inline if
> > the inode is special in fill_inode(). Also set ->i_mapping->a_ops for
> > it. That is pointless since the both modes won't be set for special
> > inode when creating EROFS filesystem image. So, let's avoid it.
> > 
> > Signed-off-by: Yue Hu <huyue2@yulong.com>  
> 
> Have you test this patch with some actual image with legacy mkfs since
> new mkfs framework have not supported special inode...

Hi Xiang,

I'm studying the testing :)

However, already check the code handling for special inode in leagcy mkfs as below:

```c
                break;
        case EROFS_FT_BLKDEV:
        case EROFS_FT_CHRDEV:
        case EROFS_FT_FIFO:
        case EROFS_FT_SOCK:
                mkfs_rank_inode(d);
                break;

        default:
                erofs_err("inode[%s] file_type error =%d",
                          d->i_fullpath,
```

No special inode layout operations, so this change should be fine.

Thx.

> 
> I think that is fine in priciple, however, in case to introduce some potential
> issues, I will test this patch later. I will give a Reviewed-by tag after I tested
> this patch.

Thanks.

> 
> Thanks,
> Gao Xiang
> 
> > ---
> >  drivers/staging/erofs/inode.c | 1 +
> >  1 file changed, 1 insertion(+)
> > 
> > diff --git a/drivers/staging/erofs/inode.c b/drivers/staging/erofs/inode.c
> > index 1433f25..2fe0f6d 100644
> > --- a/drivers/staging/erofs/inode.c
> > +++ b/drivers/staging/erofs/inode.c
> > @@ -205,6 +205,7 @@ static int fill_inode(struct inode *inode, int isdir)
> >  			S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) {
> >  			inode->i_op = &erofs_generic_iops;
> >  			init_special_inode(inode, inode->i_mode, inode->i_rdev);
> > +			goto out_unlock;
> >  		} else {
> >  			err = -EIO;
> >  			goto out_unlock;
> >   

Re: [PATCH] staging: erofs: don't check special inode layout

[Chao Yu]

On 2019/6/28 12:19, Yue Hu wrote:
> On Fri, 28 Jun 2019 11:50:21 +0800
> Gao Xiang <gaoxiang25@huawei.com> wrote:
> 
>> Hi Yue,
>>
>> On 2019/6/28 11:42, Yue Hu wrote:
>>> From: Yue Hu <huyue2@yulong.com>
>>>
>>> Currently, we will check if inode layout is compression or inline if
>>> the inode is special in fill_inode(). Also set ->i_mapping->a_ops for
>>> it. That is pointless since the both modes won't be set for special
>>> inode when creating EROFS filesystem image. So, let's avoid it.
>>>
>>> Signed-off-by: Yue Hu <huyue2@yulong.com>  
>>
>> Have you test this patch with some actual image with legacy mkfs since
>> new mkfs framework have not supported special inode...
> 
> Hi Xiang,
> 
> I'm studying the testing :)
> 
> However, already check the code handling for special inode in leagcy mkfs as below:
> 
> ```c
>                 break;
>         case EROFS_FT_BLKDEV:
>         case EROFS_FT_CHRDEV:
>         case EROFS_FT_FIFO:
>         case EROFS_FT_SOCK:
>                 mkfs_rank_inode(d);
>                 break;
> 
>         default:
>                 erofs_err("inode[%s] file_type error =%d",
>                           d->i_fullpath,
> ```
> 
> No special inode layout operations, so this change should be fine.
> 
> Thx.
> 
>>
>> I think that is fine in priciple, however, in case to introduce some potential
>> issues, I will test this patch later. I will give a Reviewed-by tag after I tested
>> this patch.

This patch looks good to me, if this won't fail any tests from Xiang, you can add:

Reviewed-by: Chao Yu <yuchao0@huawei.com>

Thanks,

> 
> Thanks.
> 
>>
>> Thanks,
>> Gao Xiang
>>
>>> ---
>>>  drivers/staging/erofs/inode.c | 1 +
>>>  1 file changed, 1 insertion(+)
>>>
>>> diff --git a/drivers/staging/erofs/inode.c b/drivers/staging/erofs/inode.c
>>> index 1433f25..2fe0f6d 100644
>>> --- a/drivers/staging/erofs/inode.c
>>> +++ b/drivers/staging/erofs/inode.c
>>> @@ -205,6 +205,7 @@ static int fill_inode(struct inode *inode, int isdir)
>>>  			S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) {
>>>  			inode->i_op = &erofs_generic_iops;
>>>  			init_special_inode(inode, inode->i_mode, inode->i_rdev);
>>> +			goto out_unlock;
>>>  		} else {
>>>  			err = -EIO;
>>>  			goto out_unlock;
>>>   
> 
> .
>