Support the fallocate() file operation.

[zfs.git] / config / kernel-fallocate.m4

diff --git a/config/kernel-fallocate.m4 b/config/kernel-fallocate.m4
new file mode 100644 (file)
index 0000000..d551276
--- /dev/null
+++ b/config/kernel-fallocate.m4
@@ -0,0 +1,48 @@
+dnl #
+dnl # Linux 2.6.38 - 3.x API
+dnl #
+AC_DEFUN([ZFS_AC_KERNEL_FILE_FALLOCATE], [
+       AC_MSG_CHECKING([whether fops->fallocate() exists])
+       ZFS_LINUX_TRY_COMPILE([
+               #include <linux/fs.h>
+       ],[
+               long (*fallocate) (struct file *, int, loff_t, loff_t) = NULL;
+               struct file_operations fops __attribute__ ((unused)) = {
+                       .fallocate = fallocate,
+               };
+       ],[
+               AC_MSG_RESULT(yes)
+               AC_DEFINE(HAVE_FILE_FALLOCATE, 1, [fops->fallocate() exists])
+       ],[
+               AC_MSG_RESULT(no)
+       ])
+])
+
+dnl #
+dnl # Linux 2.6.x - 2.6.37 API
+dnl #
+AC_DEFUN([ZFS_AC_KERNEL_INODE_FALLOCATE], [
+       AC_MSG_CHECKING([whether iops->fallocate() exists])
+       ZFS_LINUX_TRY_COMPILE([
+               #include <linux/fs.h>
+       ],[
+               long (*fallocate) (struct inode *, int, loff_t, loff_t) = NULL;
+               struct inode_operations fops __attribute__ ((unused)) = {
+                       .fallocate = fallocate,
+               };
+       ],[
+               AC_MSG_RESULT(yes)
+               AC_DEFINE(HAVE_INODE_FALLOCATE, 1, [fops->fallocate() exists])
+       ],[
+               AC_MSG_RESULT(no)
+       ])
+])
+
+dnl #
+dnl # The fallocate callback was moved from the inode_operations
+dnl # structure to the file_operations structure.
+dnl #
+AC_DEFUN([ZFS_AC_KERNEL_FALLOCATE], [
+       ZFS_AC_KERNEL_FILE_FALLOCATE
+       ZFS_AC_KERNEL_INODE_FALLOCATE
+])