Split spl-build.m4

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

diff --git a/config/kernel-rw.m4 b/config/kernel-rw.m4
new file mode 100644 (file)
index 0000000..23c14b7
--- /dev/null
+++ b/config/kernel-rw.m4
@@ -0,0 +1,57 @@
+dnl #
+dnl # 4.14 API change
+dnl # kernel_write() which was introduced in 3.9 was updated to take
+dnl # the offset as a pointer which is needed by vn_rdwr().
+dnl #
+AC_DEFUN([SPL_AC_KERNEL_WRITE], [
+       AC_MSG_CHECKING([whether kernel_write() takes loff_t pointer])
+       tmp_flags="$EXTRA_KCFLAGS"
+       EXTRA_KCFLAGS="-Werror"
+       SPL_LINUX_TRY_COMPILE([
+               #include <linux/fs.h>
+       ],[
+               struct file *file = NULL;
+               const void *buf = NULL;
+               size_t count = 0;
+               loff_t *pos = NULL;
+               ssize_t ret;
+
+               ret = kernel_write(file, buf, count, pos);
+       ],[
+               AC_MSG_RESULT(yes)
+               AC_DEFINE(HAVE_KERNEL_WRITE_PPOS, 1,
+                   [kernel_write() take loff_t pointer])
+       ],[
+               AC_MSG_RESULT(no)
+       ])
+       EXTRA_KCFLAGS="$tmp_flags"
+])
+
+dnl #
+dnl # 4.14 API change
+dnl # kernel_read() which has existed for forever was updated to take
+dnl # the offset as a pointer which is needed by vn_rdwr().
+dnl #
+AC_DEFUN([SPL_AC_KERNEL_READ], [
+       AC_MSG_CHECKING([whether kernel_read() takes loff_t pointer])
+       tmp_flags="$EXTRA_KCFLAGS"
+       EXTRA_KCFLAGS="-Werror"
+       SPL_LINUX_TRY_COMPILE([
+               #include <linux/fs.h>
+       ],[
+               struct file *file = NULL;
+               void *buf = NULL;
+               size_t count = 0;
+               loff_t *pos = NULL;
+               ssize_t ret;
+
+               ret = kernel_read(file, buf, count, pos);
+       ],[
+               AC_MSG_RESULT(yes)
+               AC_DEFINE(HAVE_KERNEL_READ_PPOS, 1,
+                   [kernel_read() take loff_t pointer])
+       ],[
+               AC_MSG_RESULT(no)
+       ])
+       EXTRA_KCFLAGS="$tmp_flags"
+])