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Linux 6.18: replace write_cache_pages()

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Linux 6.18 removed write_cache_pages() without a usable replacement.
Here we implement a minimal zpl_write_cache_pages() that find the dirty
pages within the mapping, gets them into the expected state and hands
them off to zfs_putpage(), which handles the rest.

Sponsored-by: https://despairlabs.com/sponsor/
Signed-off-by: Rob Norris <robn@despairlabs.com>
This commit is contained in:
Rob Norris
2025-09-12 09:31:35 +10:00
committed by Tony Hutter
parent 04d0f83f4e
commit 005c631499
4 changed files with 134 additions and 28 deletions
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config/kernel-writeback.m4
+58
View File
@@ -0,0 +1,58 @@
AC_DEFUN([ZFS_AC_KERNEL_SRC_WRITEPAGE_T], [
dnl #
dnl # 6.3 API change
dnl # The writepage_t function type now has its first argument as
dnl # struct folio* instead of struct page*
dnl #
ZFS_LINUX_TEST_SRC([writepage_t_folio], [
#include <linux/writeback.h>
static int putpage(struct folio *folio,
struct writeback_control *wbc, void *data)
{ return 0; }
writepage_t func = putpage;
],[])
])
AC_DEFUN([ZFS_AC_KERNEL_WRITEPAGE_T], [
AC_MSG_CHECKING([whether int (*writepage_t)() takes struct folio*])
ZFS_LINUX_TEST_RESULT([writepage_t_folio], [
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_WRITEPAGE_T_FOLIO, 1,
[int (*writepage_t)() takes struct folio*])
],[
AC_MSG_RESULT(no)
])
])
AC_DEFUN([ZFS_AC_KERNEL_SRC_WRITE_CACHE_PAGES], [
dnl #
dnl # 6.18 API change
dnl # write_cache_pages() has been removed.
dnl #
ZFS_LINUX_TEST_SRC([write_cache_pages], [
#include <linux/writeback.h>
], [
(void) write_cache_pages(NULL, NULL, NULL, NULL);
])
])
AC_DEFUN([ZFS_AC_KERNEL_WRITE_CACHE_PAGES], [
AC_MSG_CHECKING([whether write_cache_pages() is available])
ZFS_LINUX_TEST_RESULT([write_cache_pages], [
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_WRITE_CACHE_PAGES, 1,
[write_cache_pages() is available])
],[
AC_MSG_RESULT(no)
])
])
AC_DEFUN([ZFS_AC_KERNEL_SRC_WRITEBACK], [
ZFS_AC_KERNEL_SRC_WRITEPAGE_T
ZFS_AC_KERNEL_SRC_WRITE_CACHE_PAGES
])
AC_DEFUN([ZFS_AC_KERNEL_WRITEBACK], [
ZFS_AC_KERNEL_WRITEPAGE_T
ZFS_AC_KERNEL_WRITE_CACHE_PAGES
])