[Devel] [PATCH rh7] ext4: ext4_mkdir must set S_IOPS_WRAPPER bit

[Maxim Patlasov]

Kostya, ms is not affected,  RedHat bz ticket: 
https://bugzilla.redhat.com/show_bug.cgi?id=1361682


On 07/29/2016 08:15 AM, Konstantin Khorenko wrote:
> Maxim, will you send the patch to mainstream as well?
>
> -- 
> Best regards,
>
> Konstantin Khorenko,
> Virtuozzo Linux Kernel Team
>
> On 07/26/2016 12:01 AM, Maxim Patlasov wrote:
>> ext4_iget() sets this bit for directories. Let's do the same in 
>> ext4_mkdir().
>> Otherwise, the behaviour of vfs_rename (on top of ext4) varies 
>> depending on
>> how the in-core inode was born: via lookup or mkdir.
>>
>> The key place in vfs_rename sensible to the change is:
>>
>>>     if (flags && !rename2)
>>>         return -EINVAL;
>>
>> Signed-off-by: Maxim Patlasov <mpatlasov at virtuozzo.com>
>> ---
>>  fs/ext4/namei.c |    1 +
>>  1 file changed, 1 insertion(+)
>>
>> diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
>> index 0adc6df..bebe698 100644
>> --- a/fs/ext4/namei.c
>> +++ b/fs/ext4/namei.c
>> @@ -2413,6 +2413,7 @@ retry:
>>
>>      inode->i_op = &ext4_dir_inode_operations.ops;
>>      inode->i_fop = &ext4_dir_operations;
>> +    inode->i_flags |= S_IOPS_WRAPPER;
>>      err = ext4_init_new_dir(handle, dir, inode);
>>      if (err)
>>          goto out_clear_inode;
>>
>> .
>>