[dm-devel] [PATCH v3 1/2] md raid0/linear: Mark array as 'broken' and fail BIOs if a member is gone

[Guilherme G. Piccoli]

On 22/08/2019 18:55, Song Liu wrote:
> [...] 
>> +	if (unlikely(!(tmp_dev->rdev->bdev->bd_disk->flags & GENHD_FL_UP))) {
>> +		if (!test_bit(MD_BROKEN, &mddev->flags))
>> +			pr_warn("md: %s: linear array has a missing/failed member\n",
>> +				mdname(mddev));
>> +		set_bit(MD_BROKEN, &mddev->flags);
>> +		bio_io_error(bio);
>> +		return true;
>> +	}
>> +
> 
> Maybe we can somehow put this block in a helper and use it in both raid0
> and linear code?
> 
> Otherwise, looks good to me. 
> 
> Thanks,
> Song
> 

OK, so something as a function with a prototype like
"void md_is_broken(struct md_rdev *rd, const char *md_type)"
is good for you?
Then we can use that as the check if a member failed and in positive
case, we can print the message (if not printed before) and return to the
raid0/linear driver in order it fails the bio and returns.
I'd prefer keeping the bio out of the helper, agreed?

If you have suggestion for a better name, let me know.
Thanks,


Guilherme