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dnl #
dnl # 3.1 API change
dnl # The super_block structure now stores a per-filesystem shrinker.
dnl # This interface is preferable because it can be used to specifically
dnl # target only the zfs filesystem for pruning.
dnl #
AC_DEFUN([ZFS_AC_KERNEL_SRC_SUPER_BLOCK_S_SHRINK], [
ZFS_LINUX_TEST_SRC([super_block_s_shrink], [
#include <linux/fs.h>
int shrink(struct shrinker *s, struct shrink_control *sc)
{ return 0; }
static const struct super_block
sb __attribute__ ((unused)) = {
.s_shrink.seeks = DEFAULT_SEEKS,
.s_shrink.batch = 0,
};
],[])
])
AC_DEFUN([ZFS_AC_KERNEL_SUPER_BLOCK_S_SHRINK], [
AC_MSG_CHECKING([whether super_block has s_shrink])
ZFS_LINUX_TEST_RESULT([super_block_s_shrink], [
AC_MSG_RESULT(yes)
],[
ZFS_LINUX_TEST_ERROR([sb->s_shrink()])
])
])
dnl #
dnl # 3.12 API change
dnl # The nid member was added to struct shrink_control to support
dnl # NUMA-aware shrinkers.
dnl #
AC_DEFUN([ZFS_AC_KERNEL_SRC_SHRINK_CONTROL_HAS_NID], [
ZFS_LINUX_TEST_SRC([shrink_control_nid], [
#include <linux/fs.h>
],[
struct shrink_control sc __attribute__ ((unused));
unsigned long scnidsize __attribute__ ((unused)) =
sizeof(sc.nid);
])
])
AC_DEFUN([ZFS_AC_KERNEL_SHRINK_CONTROL_HAS_NID], [
AC_MSG_CHECKING([whether shrink_control has nid])
ZFS_LINUX_TEST_RESULT([shrink_control_nid], [
AC_MSG_RESULT(yes)
AC_DEFINE(SHRINK_CONTROL_HAS_NID, 1,
[struct shrink_control has nid])
],[
AC_MSG_RESULT(no)
])
])
AC_DEFUN([ZFS_AC_KERNEL_SRC_SHRINKER_CALLBACK], [
ZFS_LINUX_TEST_SRC([shrinker_cb_shrink_control], [
#include <linux/mm.h>
int shrinker_cb(struct shrinker *shrink,
struct shrink_control *sc) { return 0; }
],[
struct shrinker cache_shrinker = {
.shrink = shrinker_cb,
.seeks = DEFAULT_SEEKS,
};
register_shrinker(&cache_shrinker);
])
ZFS_LINUX_TEST_SRC([shrinker_cb_shrink_control_split], [
#include <linux/mm.h>
unsigned long shrinker_cb(struct shrinker *shrink,
struct shrink_control *sc) { return 0; }
],[
struct shrinker cache_shrinker = {
.count_objects = shrinker_cb,
.scan_objects = shrinker_cb,
.seeks = DEFAULT_SEEKS,
};
register_shrinker(&cache_shrinker);
])
])
AC_DEFUN([ZFS_AC_KERNEL_SHRINKER_CALLBACK],[
dnl #
dnl # 3.0 - 3.11 API change
dnl # ->shrink(struct shrinker *, struct shrink_control *sc)
dnl #
AC_MSG_CHECKING([whether new 2-argument shrinker exists])
ZFS_LINUX_TEST_RESULT([shrinker_cb_shrink_control], [
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_SINGLE_SHRINKER_CALLBACK, 1,
[new shrinker callback wants 2 args])
],[
AC_MSG_RESULT(no)
dnl #
dnl # 3.12 API change,
dnl # ->shrink() is logically split in to
dnl # ->count_objects() and ->scan_objects()
dnl #
AC_MSG_CHECKING([whether ->count_objects callback exists])
ZFS_LINUX_TEST_RESULT([shrinker_cb_shrink_control_split], [
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_SPLIT_SHRINKER_CALLBACK, 1,
[->count_objects exists])
],[
ZFS_LINUX_TEST_ERROR([shrinker])
])
])
])
dnl #
dnl # 2.6.39 API change,
dnl # Shrinker adjust to use common shrink_control structure.
dnl #
AC_DEFUN([ZFS_AC_KERNEL_SRC_SHRINK_CONTROL_STRUCT], [
ZFS_LINUX_TEST_SRC([shrink_control_struct], [
#include <linux/mm.h>
],[
struct shrink_control sc __attribute__ ((unused));
sc.nr_to_scan = 0;
sc.gfp_mask = GFP_KERNEL;
])
])
AC_DEFUN([ZFS_AC_KERNEL_SHRINK_CONTROL_STRUCT], [
AC_MSG_CHECKING([whether struct shrink_control exists])
ZFS_LINUX_TEST_RESULT([shrink_control_struct], [
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_SHRINK_CONTROL_STRUCT, 1,
[struct shrink_control exists])
],[
ZFS_LINUX_TEST_ERROR([shrink_control])
])
])
AC_DEFUN([ZFS_AC_KERNEL_SRC_SHRINKER], [
ZFS_AC_KERNEL_SRC_SUPER_BLOCK_S_SHRINK
ZFS_AC_KERNEL_SRC_SHRINK_CONTROL_HAS_NID
ZFS_AC_KERNEL_SRC_SHRINKER_CALLBACK
ZFS_AC_KERNEL_SRC_SHRINK_CONTROL_STRUCT
])
AC_DEFUN([ZFS_AC_KERNEL_SHRINKER], [
ZFS_AC_KERNEL_SUPER_BLOCK_S_SHRINK
ZFS_AC_KERNEL_SHRINK_CONTROL_HAS_NID
ZFS_AC_KERNEL_SHRINKER_CALLBACK
ZFS_AC_KERNEL_SHRINK_CONTROL_STRUCT
])
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