Split spl-build.m4

[mirror_spl.git] / config / kernel-kuidgid.m4

diff --git a/config/kernel-kuidgid.m4 b/config/kernel-kuidgid.m4
new file mode 100644 (file)
index 0000000..47d1937
--- /dev/null
+++ b/config/kernel-kuidgid.m4
@@ -0,0 +1,28 @@
+dnl #
+dnl # User namespaces, use kuid_t in place of uid_t
+dnl # where available. Not strictly a user namespaces thing
+dnl # but it should prevent surprises
+dnl #
+AC_DEFUN([SPL_AC_KUIDGID_T], [
+       AC_MSG_CHECKING([whether kuid_t/kgid_t is available])
+       SPL_LINUX_TRY_COMPILE([
+               #include <linux/uidgid.h>
+       ], [
+               kuid_t userid = KUIDT_INIT(0);
+               kgid_t groupid = KGIDT_INIT(0);
+       ],[
+               SPL_LINUX_TRY_COMPILE([
+                       #include <linux/uidgid.h>
+               ], [
+                       kuid_t userid = 0;
+                       kgid_t groupid = 0;
+               ],[
+                       AC_MSG_RESULT(yes; optional)
+               ],[
+                       AC_MSG_RESULT(yes; mandatory)
+                       AC_DEFINE(HAVE_KUIDGID_T, 1, [kuid_t/kgid_t in use])
+               ])
+       ],[
+               AC_MSG_RESULT(no)
+       ])
+])