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3741 zfs needs better comments
Submitted by:   Will Andrews <willa@spectralogic.com>
Submitted by:   Justin Gibbs <justing@spectralogic.com>
Submitted by:   Alan Somers <alans@spectralogic.com>
Reviewed by:    Matthew Ahrens <mahrens@delphix.com>


4411                 case ENOTSUP:
4412                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
4413                             "pool must be upgraded"));
4414                         err = zfs_error(hdl, EZFS_BADVERSION, errbuf);
4415                         break;
4416                 case EINVAL:
4417                         err = zfs_error(hdl, EZFS_BADTYPE, errbuf);
4418                         break;
4419                 case ENOENT:
4420                         err = zfs_error(hdl, EZFS_NOENT, errbuf);
4421                         break;
4422                 default:
4423                         err = zfs_standard_error_fmt(hdl, errno, errbuf);
4424                         break;
4425                 }
4426         }
4427 
4428         return (err);
4429 }
4430 





4431 uint64_t
4432 zvol_volsize_to_reservation(uint64_t volsize, nvlist_t *props)
4433 {
4434         uint64_t numdb;
4435         uint64_t nblocks, volblocksize;
4436         int ncopies;
4437         char *strval;
4438 
4439         if (nvlist_lookup_string(props,
4440             zfs_prop_to_name(ZFS_PROP_COPIES), &strval) == 0)
4441                 ncopies = atoi(strval);
4442         else
4443                 ncopies = 1;
4444         if (nvlist_lookup_uint64(props,
4445             zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE),
4446             &volblocksize) != 0)
4447                 volblocksize = ZVOL_DEFAULT_BLOCKSIZE;
4448         nblocks = volsize/volblocksize;
4449         /* start with metadnode L0-L6 */
4450         numdb = 7;


4411                 case ENOTSUP:
4412                         zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
4413                             "pool must be upgraded"));
4414                         err = zfs_error(hdl, EZFS_BADVERSION, errbuf);
4415                         break;
4416                 case EINVAL:
4417                         err = zfs_error(hdl, EZFS_BADTYPE, errbuf);
4418                         break;
4419                 case ENOENT:
4420                         err = zfs_error(hdl, EZFS_NOENT, errbuf);
4421                         break;
4422                 default:
4423                         err = zfs_standard_error_fmt(hdl, errno, errbuf);
4424                         break;
4425                 }
4426         }
4427 
4428         return (err);
4429 }
4430 
4431 /*
4432  * Convert the zvol's volume size to an appropriate reservation.
4433  * Note: If this routine is updated, it is necessary to update the ZFS test
4434  * suite's shell version in reservation.kshlib.
4435  */
4436 uint64_t
4437 zvol_volsize_to_reservation(uint64_t volsize, nvlist_t *props)
4438 {
4439         uint64_t numdb;
4440         uint64_t nblocks, volblocksize;
4441         int ncopies;
4442         char *strval;
4443 
4444         if (nvlist_lookup_string(props,
4445             zfs_prop_to_name(ZFS_PROP_COPIES), &strval) == 0)
4446                 ncopies = atoi(strval);
4447         else
4448                 ncopies = 1;
4449         if (nvlist_lookup_uint64(props,
4450             zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE),
4451             &volblocksize) != 0)
4452                 volblocksize = ZVOL_DEFAULT_BLOCKSIZE;
4453         nblocks = volsize/volblocksize;
4454         /* start with metadnode L0-L6 */
4455         numdb = 7;