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a6cc9756 BB |
1 | dnl # |
2 | dnl # Determine an available miscellaneous minor number which can be used | |
3 | dnl # for the /dev/zfs device. This is needed because kernel module | |
4 | dnl # auto-loading depends on registering a reserved non-conflicting minor | |
5 | dnl # number. Start with a large known available unreserved minor and work | |
6 | dnl # our way down to lower value if a collision is detected. | |
7 | dnl # | |
8 | AC_DEFUN([ZFS_AC_KERNEL_MISC_MINOR], [ | |
9 | AC_MSG_CHECKING([for available /dev/zfs minor]) | |
10 | ||
11 | for i in $(seq 249 -1 200); do | |
12 | if ! grep -q "^#define\s\+.*_MINOR\s\+.*$i" \ | |
13 | ${LINUX}/include/linux/miscdevice.h; then | |
14 | ZFS_MINOR="$i" | |
15 | AC_MSG_RESULT($ZFS_MINOR) | |
16 | AC_DEFINE_UNQUOTED([ZFS_MINOR], [$ZFS_MINOR], | |
17 | [/dev/zfs minor]) | |
18 | break | |
19 | fi | |
20 | done | |
21 | ||
22 | AS_IF([ test -z "$ZFS_MINOR"], [ | |
23 | AC_MSG_ERROR([ | |
24 | *** No available misc minor numbers available for use.]) | |
25 | ]) | |
26 | ]) |