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Linux 5.16: wait_on_page_bit() no longer available to modules 

Instead, linux/pagemap.h offers a number of folio-specific functions to
be called instead. In this case, module/os/linux/zfs/zfs_vnops_os.c
wants to call wait_on_page_bit(pp, PG_writeback). This gets replaced
with folio_wait_bit(folio_page(pp), PG_writeback). This change modifies
the code to conditionally compile that if configure identifies th
presence of the folio_wait_bit() function.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Coleman Kane <ckane@colemankane.org>
Closes #12800
This commit is contained in:
Coleman Kane 2021-11-16 00:10:35 -05:00 committed by Brian Behlendorf
parent ded851b2e0
commit c0fb44c506
3 changed files with 32 additions and 0 deletions
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26
config/kernel-pagemap-folio_wait_bit.m4 Normal file
View File

@ -0,0 +1,26 @@
dnl #
dnl # Linux 5.16 no longer allows directly calling wait_on_page_bit, and
dnl # instead requires you to call folio-specific functions. In this case,
dnl # wait_on_page_bit(pg, PG_writeback) becomes
dnl # folio_wait_bit(pg, PG_writeback)
dnl #
AC_DEFUN([ZFS_AC_KERNEL_SRC_PAGEMAP_FOLIO_WAIT_BIT], [
ZFS_LINUX_TEST_SRC([pagemap_has_folio_wait_bit], [
#include <linux/pagemap.h>
],[
static struct folio *f = NULL;
folio_wait_bit(f, PG_writeback);
])
])
AC_DEFUN([ZFS_AC_KERNEL_PAGEMAP_FOLIO_WAIT_BIT], [
AC_MSG_CHECKING([folio_wait_bit() exists])
ZFS_LINUX_TEST_RESULT([pagemap_has_folio_wait_bit], [
AC_MSG_RESULT([yes])
AC_DEFINE(HAVE_PAGEMAP_FOLIO_WAIT_BIT, 1,
[folio_wait_bit() exists])
],[
AC_MSG_RESULT([no])
])
])

2
config/kernel.m4
View File

@ -134,6 +134,7 @@ AC_DEFUN([ZFS_AC_KERNEL_TEST_SRC], [
ZFS_AC_KERNEL_SRC_SET_SPECIAL_STATE
ZFS_AC_KERNEL_SRC_VFS_SET_PAGE_DIRTY_NOBUFFERS
ZFS_AC_KERNEL_SRC_STANDALONE_LINUX_STDARG
ZFS_AC_KERNEL_SRC_PAGEMAP_FOLIO_WAIT_BIT
AC_MSG_CHECKING([for available kernel interfaces])
ZFS_LINUX_TEST_COMPILE_ALL([kabi])
@ -241,6 +242,7 @@ AC_DEFUN([ZFS_AC_KERNEL_TEST_RESULT], [
ZFS_AC_KERNEL_SET_SPECIAL_STATE
ZFS_AC_KERNEL_VFS_SET_PAGE_DIRTY_NOBUFFERS
ZFS_AC_KERNEL_STANDALONE_LINUX_STDARG
ZFS_AC_KERNEL_PAGEMAP_FOLIO_WAIT_BIT
])
dnl #

4
module/os/linux/zfs/zfs_vnops_os.c
View File

@ -3531,7 +3531,11 @@ zfs_putpage(struct inode *ip, struct page *pp, struct writeback_control *wbc)
if (wbc->sync_mode != WB_SYNC_NONE) {
if (PageWriteback(pp))
#ifdef HAVE_PAGEMAP_FOLIO_WAIT_BIT
folio_wait_bit(page_folio(pp), PG_writeback);
#else
wait_on_page_bit(pp, PG_writeback);
#endif
}
ZFS_EXIT(zfsvfs);