> +/* > + * The virtual start sector is the one that was originally submitted > + * by the block layer. Due to partitioning, MD/DM cloning, etc. the > + * actual physical start sector is likely to be different. Remap > + * protection information to match the physical LBA. > + * > + * From SCSI protocol perspective there's a slight difference between > + * Type 1 and 2. The latter uses command's 32-byte exclusively, and the > + * reference tag is seeded in the command. This gives us the potential to > + * avoid virt->phys remapping during write. However, at read time we > + * don't know whether the virt sector is the same as when we wrote it > + * (we could be reading from real disk as opposed to MD/DM device. So > + * we always remap Type 2 making it identical to Type 1. > + * > + * Type 3 does not have a reference tag so no remapping is required. > + */
Please convert the comments for t10_pi_prepare/t10_pi_complete to kerneldoc format, and remove the mention of 32-byte CDBs, which are SCSI specific. Otherwise this looks good to me. Note that after this patch only sd_dif_config_host is left in sd_dif.c, at which point it might be worth merging into sd.c as a separate patch.
