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Don't hard-code number of ioctls for portability

Use (ZFS_IOC_LAST - ZFS_IOC_FIRST) instead of 256.
It seems 256 is just a number large enough to hold ioctls
at the moment.

Using 256 also causes compile-time warning or error
on platfoms whose enum zfs_ioc definition differs.

Reviewed-by: Olaf Faaland <>
Reviewed by: Brian Behlendorf <>
Reviewed-by: Igor Kozhukhov <>
Signed-off-by: Tomohiro Kusumi <>
Closes #8598
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kusumi authored and behlendorf committed Apr 7, 2019
1 parent 96e51d2 commit 703f791d3538472600571ecde01627df6b47e6d6
Showing with 1 addition and 1 deletion.
  1. +1 −1 tests/zfs-tests/cmd/libzfs_input_check/libzfs_input_check.c
@@ -37,7 +37,7 @@ const char *active_test;
* Tracks which zfs_ioc_t commands were tested
boolean_t ioc_tested[256];
boolean_t ioc_tested[ZFS_IOC_LAST - ZFS_IOC_FIRST];

* Legacy ioctls that are skipped (for now)

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