Re: [PATCH 17/19] md: raid1: check if adding pages to resync bio fails

[Johannes Thumshirn <Johannes.Thumshirn@wdc.com>]

On 30.03.23 01:44, Damien Le Moal wrote:
> On 3/30/23 02:06, Johannes Thumshirn wrote:
>> Check if adding pages to resync bio fails and if bail out.
>>
>> As the comment above suggests this cannot happen, WARN if it actually
>> happens.
>>
>> This way we can mark bio_add_pages as __must_check.
>>
>> Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
>> ---
>>  drivers/md/raid1-10.c |  7 ++++++-
>>  drivers/md/raid10.c   | 12 ++++++++++--
>>  2 files changed, 16 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/md/raid1-10.c b/drivers/md/raid1-10.c
>> index e61f6cad4e08..c21b6c168751 100644
>> --- a/drivers/md/raid1-10.c
>> +++ b/drivers/md/raid1-10.c
>> @@ -105,7 +105,12 @@ static void md_bio_reset_resync_pages(struct bio *bio, struct resync_pages *rp,
>>  		 * won't fail because the vec table is big
>>  		 * enough to hold all these pages
>>  		 */
>> -		bio_add_page(bio, page, len, 0);
>> +		if (WARN_ON(!bio_add_page(bio, page, len, 0))) {
> Not sure we really need the WARN_ON here...
> Nevertheless,
> 

I see it as a kind of assert(). It shouldn't fail but in theory it can.

> Reviewed-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>

Thanks