linux-ext4 - Re: [PATCH v2] ext4: Disallow modifying DAX inode flag if inline

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Message-ID: <5F62D829.3040805@cn.fujitsu.com>
Date:   Thu, 17 Sep 2020 11:29:45 +0800
From:   Xiao Yang <yangx.jy@...fujitsu.com>
To:     <tytso@....edu>
CC:     Andreas Dilger <adilger@...ger.ca>, <linux-ext4@...r.kernel.org>,
        <darrick.wong@...cle.com>, <ira.weiny@...el.com>, <jack@...e.cz>
Subject: Re: [PATCH v2] ext4: Disallow modifying DAX inode flag if inline_data
 has been set

Hi,

Ping :-)

Best Regards,
Xiao Yang
On 2020/8/29 15:27, Andreas Dilger wrote:
> On Aug 28, 2020, at 2:43 AM, Xiao Yang<yangx.jy@...fujitsu.com>  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
>> ------------------------------------------
>>
>> Fixes: b383a73f2b83 ("fs/ext4: Introduce DAX inode flag")
>> Signed-off-by: Xiao Yang<yangx.jy@...fujitsu.com>
>> Reviewed-by: Jan Kara<jack@...e.cz>
> Reviewed-by: Andreas Dilger<adilger@...ger.ca>
>
>> ---
>> 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
>>
>>
>>
>
> Cheers, Andreas
>
>
>
>
>