mirror_zfs/config/kernel-vfs-release_folio.m4
tstabrawa b052035990
Avoid BUG in migrate_folio_extra
Linux page migration code won't wait for writeback to complete unless
it needs to call release_folio.  Call SetPagePrivate wherever
PageUptodate is set and define .release_folio, to cause
fallback_migrate_folio to wait for us.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: tstabrawa <59430211+tstabrawa@users.noreply.github.com>
Closes #15140
Closes #16568
2024-09-26 08:57:09 -07:00

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dnl #
dnl # Linux 5.19 uses release_folio in lieu of releasepage
dnl #
AC_DEFUN([ZFS_AC_KERNEL_SRC_VFS_RELEASE_FOLIO], [
ZFS_LINUX_TEST_SRC([vfs_has_release_folio], [
#include <linux/fs.h>
static bool
test_release_folio(struct folio *folio, gfp_t gfp) {
(void) folio; (void) gfp;
return (0);
}
static const struct address_space_operations
aops __attribute__ ((unused)) = {
.release_folio = test_release_folio,
};
],[])
])
AC_DEFUN([ZFS_AC_KERNEL_VFS_RELEASE_FOLIO], [
dnl #
dnl # Linux 5.19 uses release_folio in lieu of releasepage
dnl #
AC_MSG_CHECKING([whether release_folio exists])
ZFS_LINUX_TEST_RESULT([vfs_has_release_folio], [
AC_MSG_RESULT([yes])
AC_DEFINE(HAVE_VFS_RELEASE_FOLIO, 1, [release_folio exists])
],[
AC_MSG_RESULT([no])
])
])