On 1/19/18 10:36 AM, weiping zhang wrote:
> 2018-01-11 0:36 GMT+08:00 weiping zhang <zhangweiping@xxxxxxxxxxxxxxx>:
>> bdi debugfs dir/file may create fail, add error log here.
>>
>> Signed-off-by: weiping zhang <zhangweiping@xxxxxxxxxxxxxxx>
>> ---
>> V1->V2:
>> fix indentation and make log message more clear
>>
>> mm/backing-dev.c | 4 +++-
>> 1 file changed, 3 insertions(+), 1 deletion(-)
>>
>> diff --git a/mm/backing-dev.c b/mm/backing-dev.c
>> index b5f940c..0a49665 100644
>> --- a/mm/backing-dev.c
>> +++ b/mm/backing-dev.c
>> @@ -885,7 +885,9 @@ int bdi_register_va(struct backing_dev_info *bdi, const char *fmt, va_list args)
>> cgwb_bdi_register(bdi);
>> bdi->dev = dev;
>>
>> - bdi_debug_register(bdi, dev_name(dev));
>> + if (bdi_debug_register(bdi, dev_name(dev)))
>> + pr_warn("blkdev %s: creation of bdi debugfs entries failed.\n",
>> + dev_name(dev));
>> set_bit(WB_registered, &bdi->wb.state);
>>
>> spin_lock_bh(&bdi_lock);
>> --
>
> Hi Jens,
>
> madam has no permission to create debuts entry if SELINUX is enable at
> Fedora and Centos,
> and we have revert 6d0e4827b72 Revert "bdi: add error handle for
> bdi_debug_register", that is to say
> bdi debugfs is not the key component of block device, this patch just
> add warning log.
Have we fixed the case where we know it will trigger?
--
Jens Axboe
