Linux 3.5 compat, iops->truncate_range() removed

[zfs.git] / config / kernel.m4

diff --git a/config/kernel.m4 b/config/kernel.m4
index 0adcead..55609cd 100644 (file)
--- a/config/kernel.m4
+++ b/config/kernel.m4
@@ -8,6 +8,7 @@ AC_DEFUN([ZFS_AC_CONFIG_KERNEL], [
        ZFS_AC_KERNEL_BDEV_BLOCK_DEVICE_OPERATIONS
        ZFS_AC_KERNEL_TYPE_FMODE_T
        ZFS_AC_KERNEL_KOBJ_NAME_LEN
+       ZFS_AC_KERNEL_3ARG_BLKDEV_GET
        ZFS_AC_KERNEL_BLKDEV_GET_BY_PATH
        ZFS_AC_KERNEL_OPEN_BDEV_EXCLUSIVE
        ZFS_AC_KERNEL_INVALIDATE_BDEV_ARGS
@@ -34,6 +35,7 @@ AC_DEFUN([ZFS_AC_CONFIG_KERNEL], [
        ZFS_AC_KERNEL_BLK_RQ_POS
        ZFS_AC_KERNEL_BLK_RQ_SECTORS
        ZFS_AC_KERNEL_GET_DISK_RO
+       ZFS_AC_KERNEL_GET_GENDISK
        ZFS_AC_KERNEL_RQ_IS_SYNC
        ZFS_AC_KERNEL_RQ_FOR_EACH_SEGMENT
        ZFS_AC_KERNEL_CONST_XATTR_HANDLER
@@ -45,7 +47,12 @@ AC_DEFUN([ZFS_AC_CONFIG_KERNEL], [
        ZFS_AC_KERNEL_NR_CACHED_OBJECTS
        ZFS_AC_KERNEL_FREE_CACHED_OBJECTS
        ZFS_AC_KERNEL_FALLOCATE
+       ZFS_AC_KERNEL_TRUNCATE_RANGE
+       ZFS_AC_KERNEL_CREATE_UMODE_T
+       ZFS_AC_KERNEL_AUTOMOUNT
+       ZFS_AC_KERNEL_ENCODE_FH_WITH_INODE
        ZFS_AC_KERNEL_INSERT_INODE_LOCKED
+       ZFS_AC_KERNEL_D_MAKE_ROOT
        ZFS_AC_KERNEL_D_OBTAIN_ALIAS
        ZFS_AC_KERNEL_CHECK_DISK_SIZE_CHANGE
        ZFS_AC_KERNEL_TRUNCATE_SETSIZE
@@ -309,34 +316,75 @@ dnl # Certain kernel build options are not supported.  These must be
 dnl # detected at configure time and cause a build failure.  Otherwise
 dnl # modules may be successfully built that behave incorrectly.
 dnl #
-dnl # CONFIG_PREEMPT - Preempt kernels require special handling.
+AC_DEFUN([ZFS_AC_KERNEL_CONFIG], [
+
+       AS_IF([test "$ZFS_META_LICENSE" = GPL], [
+               AC_DEFINE([HAVE_GPL_ONLY_SYMBOLS], [1],
+                       [Define to 1 if licensed under the GPL])
+       ])
+
+       ZFS_AC_KERNEL_CONFIG_PREEMPT
+       ZFS_AC_KERNEL_CONFIG_DEBUG_LOCK_ALLOC
+])
+
 dnl #
-dnl # There are certain kernel build options which when enabled are
-dnl # completely incompatible with non GPL kernel modules.  It is best
-dnl # to detect these at configure time and fail with a clear error
-dnl # rather than build everything and fail during linking.
+dnl # Check CONFIG_PREEMPT
 dnl #
-dnl # CONFIG_DEBUG_LOCK_ALLOC - Maps mutex_lock() to mutex_lock_nested()
+dnl # Premptible kernels will be supported in the future.  But at the
+dnl # moment there are a few places in the code which need to be updated
+dnl # to accomidate them.  Until that work occurs we should detect this
+dnl # at configure time and fail with a sensible message.  Otherwise,
+dnl # people will be able to build successfully, however they will have
+dnl # stability problems.  See https://github.com/zfsonlinux/zfs/issues/83
 dnl #
-AC_DEFUN([ZFS_AC_KERNEL_CONFIG], [
+AC_DEFUN([ZFS_AC_KERNEL_CONFIG_PREEMPT], [
 
        ZFS_LINUX_CONFIG([PREEMPT],
                AC_MSG_ERROR([
        *** Kernel built with CONFIG_PREEMPT which is not supported.
        *** You must rebuild your kernel without this option.]), [])
+])
 
-       AS_IF([test "$ZFS_META_LICENSE" = CDDL], [
-               ZFS_LINUX_CONFIG([DEBUG_LOCK_ALLOC],
-               AC_MSG_ERROR([
-       *** Kernel built with CONFIG_DEBUG_LOCK_ALLOC which is
-       *** incompatible with the CDDL license.  You must rebuild
-       *** your kernel without this option.]), [])
-       ])
-
-       AS_IF([test "$ZFS_META_LICENSE" = GPL], [
-               AC_DEFINE([HAVE_GPL_ONLY_SYMBOLS], [1],
-                       [Define to 1 if licensed under the GPL])
-       ])
+dnl #
+dnl # Check CONFIG_DEBUG_LOCK_ALLOC
+dnl #
+dnl # This is typically only set for debug kernels because it comes with
+dnl # a performance penalty.  However, when it is set it maps the non-GPL
+dnl # symbol mutex_lock() to the GPL-only mutex_lock_nested() symbol.
+dnl # This will cause a failure at link time which we'd rather know about
+dnl # at compile time.
+dnl #
+dnl # Since we plan to pursue making mutex_lock_nested() a non-GPL symbol
+dnl # with the upstream community we add a check to detect this case.
+dnl #
+AC_DEFUN([ZFS_AC_KERNEL_CONFIG_DEBUG_LOCK_ALLOC], [
+
+       ZFS_LINUX_CONFIG([DEBUG_LOCK_ALLOC], [
+               AC_MSG_CHECKING([whether mutex_lock() is GPL-only])
+               tmp_flags="$EXTRA_KCFLAGS"
+               ZFS_LINUX_TRY_COMPILE([
+                       #include <linux/module.h>
+                       #include <linux/mutex.h>
+
+                       MODULE_LICENSE("$ZFS_META_LICENSE");
+               ],[
+                       struct mutex lock;
+
+                       mutex_init(&lock);
+                       mutex_lock(&lock);
+                       mutex_unlock(&lock);
+               ],[
+                       AC_MSG_RESULT(no)
+               ],[
+                       AC_MSG_RESULT(yes)
+                       AC_MSG_ERROR([
+       *** Kernel built with CONFIG_DEBUG_LOCK_ALLOC which is incompatible
+       *** with the CDDL license and will prevent the module linking stage
+       *** from succeeding.  You must rebuild your kernel without this
+       *** option enabled.])
+               ])
+               EXTRA_KCFLAGS="$tmp_flags"
+       ], [])
 ])
 
 dnl #