mirror_zfs/config/kernel-lookup-bdev.m4
Hajo Möller e02aaf17f1 Fix lookup_bdev() on Ubuntu
Ubuntu added support for checking inode permissions to lookup_bdev() in kernel
commit 193fb6a2c94fab8eb8ce70a5da4d21c7d4023bee (merged in 4.4.0-6.21).
Upstream bug: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1636517

This patch adds a test for Ubuntu's variant of lookup_bdev() to configure and
calls the function in the correct way.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Hajo Möller <dasjoe@gmail.com>
Closes #5336
2016-10-26 10:30:43 -07:00

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dnl #
dnl # 2.6.27, lookup_bdev() was exported.
dnl # 4.4.0-6.21 - x.y on Ubuntu, lookup_bdev() takes 2 arguments.
dnl #
AC_DEFUN([ZFS_AC_KERNEL_LOOKUP_BDEV],
[AC_MSG_CHECKING([whether lookup_bdev() wants 1 arg])
ZFS_LINUX_TRY_COMPILE_SYMBOL([
#include <linux/fs.h>
], [
lookup_bdev(NULL);
], [lookup_bdev], [fs/block_dev.c], [
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_1ARG_LOOKUP_BDEV, 1, [lookup_bdev() wants 1 arg])
], [
AC_MSG_RESULT(no)
AC_MSG_CHECKING([whether lookup_bdev() wants 2 args])
ZFS_LINUX_TRY_COMPILE_SYMBOL([
#include <linux/fs.h>
], [
lookup_bdev(NULL, FMODE_READ);
], [lookup_bdev], [fs/block_dev.c], [
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_2ARGS_LOOKUP_BDEV, 1,
[lookup_bdev() wants 2 args])
], [
AC_MSG_RESULT(no)
])
])
])