linux-kernel - Re: [f2fs-dev] [PATCH] f2fs: convert inline_data in prior to i_size

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Message-ID: <aff72932-5be3-0d81-b68d-017a392a334b@huawei.com>
Date:   Mon, 2 Sep 2019 09:45:10 +0800
From:   Chao Yu <yuchao0@...wei.com>
To:     Jaegeuk Kim <jaegeuk@...nel.org>
CC:     <linux-kernel@...r.kernel.org>,
        <linux-f2fs-devel@...ts.sourceforge.net>
Subject: Re: [f2fs-dev] [PATCH] f2fs: convert inline_data in prior to
 i_size_write

On 2019/9/1 15:25, Jaegeuk Kim wrote:
> On 08/31, Chao Yu wrote:
>> On 2019/8/30 23:34, Jaegeuk Kim wrote:
>>> This can guarantee inline_data has smaller i_size.
>>
>> So I guess "f2fs: fix to avoid corruption during inline conversion" didn't fix
>> such corruption right, I guess checkpoint & SPO before i_size recovery will
>> cause this issue?
>>
>> 	err = f2fs_convert_inline_inode(inode);
>> 	if (err) {
>>
>> -->
> 
> Yup, I think so.

Oh,  we'd better to avoid wrong fixing patch as much as possible, so what about
letting me change that patch to just fix error path of
f2fs_convert_inline_page() by adding missing f2fs_truncate_data_blocks_range()?

Meanwhile I need to add below 'Fixes' tag line:
7735730d39d7 ("f2fs: fix to propagate error from __get_meta_page()")


And if possible, could you add:

In below call path, if we failed to convert inline inode, inline inode may have
wrong i_size which is larger than max inline size.
- f2fs_setattr
 - truncate_setsize
 - f2fs_convert_inline_inode

Fixes: 0cab80ee0c9e ("f2fs: fix to convert inline inode in ->setattr")

> 
>>
>> 		/* recover old i_size */
>> 		i_size_write(inode, old_size);
>> 		return err;
>>
>>>
>>> Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>
>>
>> Reviewed-by: Chao Yu <yuchao0@...wei.com>
>>
>>> ---
>>>  fs/f2fs/file.c | 25 +++++++++----------------
>>>  1 file changed, 9 insertions(+), 16 deletions(-)
>>>
>>> diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
>>> index 08caaead6f16..a43193dd27cb 100644
>>> --- a/fs/f2fs/file.c
>>> +++ b/fs/f2fs/file.c
>>> @@ -815,14 +815,20 @@ int f2fs_setattr(struct dentry *dentry, struct iattr *attr)
>>>  
>>>  	if (attr->ia_valid & ATTR_SIZE) {
>>>  		loff_t old_size = i_size_read(inode);
>>> -		bool to_smaller = (attr->ia_size <= old_size);
>>> +
>>> +		if (attr->ia_size > MAX_INLINE_DATA(inode)) {
>>> +			/* should convert inline inode here */
>>
>> Would it be better:
>>
>> /* should convert inline inode here in piror to i_size_write to avoid
>> inconsistent status in between inline flag and i_size */
> 
> Put like this.
> 
> +                       /*
> +                        * should convert inline inode before i_size_write to
> +                        * keep smaller than inline_data size with inline flag.
> +                        */

Better, :)

thanks,

> 
>>
>> Thanks,
>>
>>> +			err = f2fs_convert_inline_inode(inode);
>>> +			if (err)
>>> +				return err;
>>> +		}
>>>  
>>>  		down_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
>>>  		down_write(&F2FS_I(inode)->i_mmap_sem);
>>>  
>>>  		truncate_setsize(inode, attr->ia_size);
>>>  
>>> -		if (to_smaller)
>>> +		if (attr->ia_size <= old_size)
>>>  			err = f2fs_truncate(inode);
>>>  		/*
>>>  		 * do not trim all blocks after i_size if target size is
>>> @@ -830,24 +836,11 @@ int f2fs_setattr(struct dentry *dentry, struct iattr *attr)
>>>  		 */
>>>  		up_write(&F2FS_I(inode)->i_mmap_sem);
>>>  		up_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
>>> -
>>>  		if (err)
>>>  			return err;
>>>  
>>> -		if (!to_smaller) {
>>> -			/* should convert inline inode here */
>>> -			if (!f2fs_may_inline_data(inode)) {
>>> -				err = f2fs_convert_inline_inode(inode);
>>> -				if (err) {
>>> -					/* recover old i_size */
>>> -					i_size_write(inode, old_size);
>>> -					return err;
>>> -				}
>>> -			}
>>> -			inode->i_mtime = inode->i_ctime = current_time(inode);
>>> -		}
>>> -
>>>  		down_write(&F2FS_I(inode)->i_sem);
>>> +		inode->i_mtime = inode->i_ctime = current_time(inode);
>>>  		F2FS_I(inode)->last_disk_size = i_size_read(inode);
>>>  		up_write(&F2FS_I(inode)->i_sem);
>>>  	}
>>>
> .
>