- if (delta > 0 && delta > avail)
- return (ENOSPC);
- if (delta > 0 && dd->dd_phys->dd_quota > 0 &&
- new_reservation > dd->dd_phys->dd_quota)
- return (ENOSPC);
+ if (MAX(used, new_reservation) > MAX(used, dd->dd_phys->dd_reserved)) {
+ uint64_t delta = MAX(used, new_reservation) -
+ MAX(used, dd->dd_phys->dd_reserved);
+
+ if (delta > avail)
+ return (ENOSPC);
+ if (dd->dd_phys->dd_quota > 0 &&
+ new_reservation > dd->dd_phys->dd_quota)
+ return (ENOSPC);
+ }
+