linux-ext4 - Re: [PATCH] ext4: Disallow modifying DAX inode flag if inline

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Date:   Fri, 28 Aug 2020 16:59:02 +0800
From:   Xiao Yang <yangx.jy@...fujitsu.com>
To:     Jan Kara <jack@...e.cz>
CC:     <linux-ext4@...r.kernel.org>, <darrick.wong@...cle.com>,
        <ira.weiny@...el.com>, <tytso@....edu>
Subject: Re: [PATCH] ext4: Disallow modifying DAX inode flag if inline_data
 has been set

On 2020/8/28 16:49, Jan Kara wrote:
> On Fri 28-08-20 15:15:01, Xiao Yang wrote:
>> inline_data is mutually exclusive to DAX so enabling both of them triggers
>> the following issue:
>> ------------------------------------------
>> # mkfs.ext4 -F -O inline_data /dev/pmem1
>> ...
>> # mount /dev/pmem1 /mnt
>> # echo 'test'>/mnt/file
>> # lsattr -l /mnt/file
>> /mnt/file                    Inline_Data
>> # xfs_io -c "chattr +x" /mnt/file
>> # xfs_io -c "lsattr -v" /mnt/file
>> [dax] /mnt/file
>> # umount /mnt
>> # mount /dev/pmem1 /mnt
>> # cat /mnt/file
>> cat: /mnt/file: Numerical result out of range
>> ------------------------------------------
>>
>> Signed-off-by: Xiao Yang<yangx.jy@...fujitsu.com>
> Thanks. The patch looks good to me. You can add:
>
> Reviewed-by: Jan Kara<jack@...e.cz>
>
> Please also add the following tag to the changelog:
>
> Fixes: b383a73f2b83 ("fs/ext4: Introduce DAX inode flag")
>
> so that the patch gets properly picked up to stable trees etc.
Hi Jan,

Thanks for your quick reply. :-)
I will send v2 patch shortly as you suggested.

Best Regards,
Xiao Yang
> Thanks!
>
> 								Honza
>
>> ---
>>   fs/ext4/ext4.h | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
>> index 523e00d7b392..69187b6205b2 100644
>> --- a/fs/ext4/ext4.h
>> +++ b/fs/ext4/ext4.h
>> @@ -492,7 +492,7 @@ struct flex_groups {
>>
>>   /* Flags which are mutually exclusive to DAX */
>>   #define EXT4_DAX_MUT_EXCL (EXT4_VERITY_FL | EXT4_ENCRYPT_FL |\
>> -			   EXT4_JOURNAL_DATA_FL)
>> +			   EXT4_JOURNAL_DATA_FL | EXT4_INLINE_DATA_FL)
>>
>>   /* Mask out flags that are inappropriate for the given type of inode. */
>>   static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
>> -- 
>> 2.25.1
>>
>>
>>