Re: [PATCH v3 07/10] block: introduce BIP_CHECK_GUARD/REFTAG/APPTAG bip_flags

[Kanchan Joshi <joshi.k@xxxxxxxxxxx>]

On 8/24/2024 2:05 PM, Christoph Hellwig wrote:
> How do we communicate what flags can be combined to the upper layer
> and userspace given the SCSI limitations here?

Will adding a new read-only sysfs attribute (under the group [*]) that 
publishes all valid combinations be fine?

With Guard/Reftag/Apptag, we get 6 combinations.
For NVMe, all can be valid. For SCSI, maximum 4 can be valid. And we 
factor the pi-type in while listing what all is valid.
For example: 010 or 001 is not valid for SCSI and should not be shown by 
this.

[*]
const struct attribute_group blk_integrity_attr_group = {
          .name = "integrity",
          .attrs = integrity_attrs,
};