>>>>> "Tom" == Tom Yan <tom.ty89@xxxxxxxxx> writes: Tom, Tom> In that case, if the granularity only act as some sort of Tom> "reference" but has no real "binding" to the actual behaviour, why Tom> would the kernel even "make up" the granularity itself according to Tom> the physical block size of the device: Tom> q-> limits.discard_granularity = max(sdkp->physical_block_size, Tom> sdkp-> unmap_granularity * logical_block_size); Many devices predate the UNMAP-related fields in the Block Limits VPD. There are also devices that do not report an OPTIMAL UNMAP GRANULARITY despite supporting UNMAP. -- Martin K. Petersen Oracle Linux Engineering -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
