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dnl #
dnl # Determine an available miscellaneous minor number which can be used
dnl # for the /dev/zfs device. This is needed because kernel module
dnl # auto-loading depends on registering a reserved non-conflicting minor
dnl # number. Start with a large known available unreserved minor and work
dnl # our way down to lower value if a collision is detected.
dnl #
AC_DEFUN([ZFS_AC_KERNEL_MISC_MINOR], [
AC_MSG_CHECKING([whether /dev/zfs minor is available])
for i in $(seq 249 -1 200); do
if ! grep -q "^#define\s\+.*_MINOR\s\+.*$i" \
${LINUX}/include/linux/miscdevice.h; then
ZFS_DEVICE_MINOR="$i"
AC_MSG_RESULT($ZFS_DEVICE_MINOR)
AC_DEFINE_UNQUOTED([ZFS_DEVICE_MINOR],
[$ZFS_DEVICE_MINOR], [/dev/zfs minor])
break
fi
done
AS_IF([ test -z "$ZFS_DEVICE_MINOR"], [
AC_MSG_ERROR([
*** No available misc minor numbers available for use.])
])
])
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