[dm-devel] [BUG] dm-thin metadata operation failed due to -ENOSPC returned by dm_pool_alloc_data_block() after processing DISCARD bios

[Zdenek Kabelac]

Dne 3.4.2018 v 11:31 Zdenek Kabelac napsal(a):
> Dne 3.4.2018 v 06:07 Dennis Yang napsal(a):
>> Hi,
>>
>> Recently we have came across an issue that dm-thin pool will be
>> switched to READ_ONLY mode because dm_pool_alloc_data_block() returns
>> -ENOSPC. AFAIK, this should not happen since alloc_data_block() will
>> check if there is any free space (and commit metadata if it first
>> reports no free space) before it allocates pool block. In addition,
>> total virtual space of all thin volumes is smaller than the pool
>> physical space in my testing environment which makes pool impossible
>> to run out of space.
>>
> 
> 
> Hi
> 
> 
> Which kernel has been used during testing - was this upstream ?
> (4.16??)
> 

Ahh - wrongly applied fstrim - yep reproducible even on this smaller data set.

I'll open BZ case for this.


Regards


Zdenek