Re: [blktests] zbd/012: Test requeuing of zoned writes and queue freezing

[Damien Le Moal <dlemoal@kernel.org>]

On 11/27/24 3:21 PM, Christoph Hellwig wrote:
> On Tue, Nov 26, 2024 at 10:16:18PM -0800, Christoph Hellwig wrote:
>> Did you trace where the bio_wouldblock_error is coming from?  Probably
>> a failing request allocation?  Can we call the guts of blk_zone_plug_bio
>> after allocating the request to avoid this?
> 
> The easier option might be to simply to "unprepare" the bio
> (i.e. undo the append op rewrite and sector adjustment), decrement
> wp_offset and retun.  Given that no one else could issue I/O
> while we were trying to allocate the bio this should work just fine.

Might be good enough. But will also need to clear the REQ_NOWAIT flag for the
BIO if it is issued from the zone write plug BIO work. Because that one should
not have to deal with all this.

Let me try.


-- 
Damien Le Moal
Western Digital Research