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linux 6.7 compat: handle superblock shrinker member change

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In 6.7 the superblock shrinker member s_shrink has changed from being an
embedded struct to a pointer. Detect this, and don't take a reference if
it already is one.

Signed-off-by: Rob Norris <robn@despairlabs.com>
Sponsored-by: https://github.com/sponsors/robn
This commit is contained in:
Rob Norris
2023-12-16 17:39:07 +11:00
committed by Brian Behlendorf
parent 3c13601a12
commit 18a9185165
2 changed files with 42 additions and 3 deletions
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config/kernel-shrink.m4
+34 -1
View File
@@ -19,12 +19,44 @@ AC_DEFUN([ZFS_AC_KERNEL_SRC_SUPER_BLOCK_S_SHRINK], [
],[])
])
dnl #
dnl # 6.7 API change
dnl # s_shrink is now a pointer.
dnl #
AC_DEFUN([ZFS_AC_KERNEL_SRC_SUPER_BLOCK_S_SHRINK_PTR], [
ZFS_LINUX_TEST_SRC([super_block_s_shrink_ptr], [
#include <linux/fs.h>
unsigned long shrinker_cb(struct shrinker *shrink,
struct shrink_control *sc) { return 0; }
static struct shrinker shrinker = {
.count_objects = shrinker_cb,
.scan_objects = shrinker_cb,
.seeks = DEFAULT_SEEKS,
};
static const struct super_block
sb __attribute__ ((unused)) = {
.s_shrink = &shrinker,
};
],[])
])
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)
AC_DEFINE(HAVE_SUPER_BLOCK_S_SHRINK, 1,
[have super_block s_shrink])
],[
ZFS_LINUX_TEST_ERROR([sb->s_shrink()])
AC_MSG_RESULT(no)
AC_MSG_CHECKING([whether super_block has s_shrink pointer])
ZFS_LINUX_TEST_RESULT([super_block_s_shrink_ptr], [
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_SUPER_BLOCK_S_SHRINK_PTR, 1,
[have super_block s_shrink pointer])
],[
AC_MSG_RESULT(no)
ZFS_LINUX_TEST_ERROR([sb->s_shrink()])
])
])
])
@@ -174,6 +206,7 @@ AC_DEFUN([ZFS_AC_KERNEL_SHRINK_CONTROL_STRUCT], [
AC_DEFUN([ZFS_AC_KERNEL_SRC_SHRINKER], [
ZFS_AC_KERNEL_SRC_SUPER_BLOCK_S_SHRINK
ZFS_AC_KERNEL_SRC_SUPER_BLOCK_S_SHRINK_PTR
ZFS_AC_KERNEL_SRC_SHRINK_CONTROL_HAS_NID
ZFS_AC_KERNEL_SRC_SHRINKER_CALLBACK
ZFS_AC_KERNEL_SRC_SHRINK_CONTROL_STRUCT