Use simple folio migration function

Avoids using fallback_migrate_folio, which starts unnecessary writeback (leading to BUG in migrate_folio_extra). Signed-off-by: tstabrawa <[email protected]>
openzfs · Nov 4, 2024 · 47700cf · 47700cf
1 parent 669e3e6
commit 47700cf
Show file tree

Hide file tree

Showing 3 changed files with 35 additions and 0 deletions.
diff --git a/config/kernel-vfs-migrate_folio.m4 b/config/kernel-vfs-migrate_folio.m4
@@ -0,0 +1,27 @@
+dnl #
+dnl # Linux 6.0 uses migrate_folio in lieu of migrate_page
+dnl #
+AC_DEFUN([ZFS_AC_KERNEL_SRC_VFS_MIGRATE_FOLIO], [
+	ZFS_LINUX_TEST_SRC([vfs_has_migrate_folio], [
+		#include <linux/fs.h>
+		#include <linux/migrate.h>
+
+		static const struct address_space_operations
+		    aops __attribute__ ((unused)) = {
+			.migrate_folio	= migrate_folio,
+		};
+	],[])
+])
+
+AC_DEFUN([ZFS_AC_KERNEL_VFS_MIGRATE_FOLIO], [
+	dnl #
+	dnl # Linux 6.0 uses migrate_folio in lieu of migrate_page
+	dnl #
+	AC_MSG_CHECKING([whether migrate_folio exists])
+	ZFS_LINUX_TEST_RESULT([vfs_has_migrate_folio], [
+		AC_MSG_RESULT([yes])
+		AC_DEFINE(HAVE_VFS_MIGRATE_FOLIO, 1, [migrate_folio exists])
+	],[
+		AC_MSG_RESULT([no])
+	])
+])
diff --git a/config/kernel.m4 b/config/kernel.m4
@@ -77,6 +77,7 @@ AC_DEFUN([ZFS_AC_KERNEL_TEST_SRC], [
 	ZFS_AC_KERNEL_SRC_SGET
 	ZFS_AC_KERNEL_SRC_VFS_FILEMAP_DIRTY_FOLIO
 	ZFS_AC_KERNEL_SRC_VFS_READ_FOLIO
+	ZFS_AC_KERNEL_SRC_VFS_MIGRATE_FOLIO
 	ZFS_AC_KERNEL_SRC_VFS_FSYNC_2ARGS
 	ZFS_AC_KERNEL_SRC_VFS_DIRECT_IO
 	ZFS_AC_KERNEL_SRC_VFS_READPAGES
@@ -187,6 +188,7 @@ AC_DEFUN([ZFS_AC_KERNEL_TEST_RESULT], [
 	ZFS_AC_KERNEL_SGET
 	ZFS_AC_KERNEL_VFS_FILEMAP_DIRTY_FOLIO
 	ZFS_AC_KERNEL_VFS_READ_FOLIO
+	ZFS_AC_KERNEL_VFS_MIGRATE_FOLIO
 	ZFS_AC_KERNEL_VFS_FSYNC_2ARGS
 	ZFS_AC_KERNEL_VFS_DIRECT_IO
 	ZFS_AC_KERNEL_VFS_READPAGES

diff --git a/module/os/linux/zfs/zpl_file.c b/module/os/linux/zfs/zpl_file.c
@@ -28,6 +28,7 @@
 #include <linux/compat.h>
 #endif
 #include <linux/fs.h>
+#include <linux/migrate.h>
 #include <sys/file.h>
 #include <sys/dmu_objset.h>
 #include <sys/zfs_znode.h>
@@ -1090,6 +1091,11 @@ const struct address_space_operations zpl_address_space_operations = {
 #ifdef HAVE_VFS_FILEMAP_DIRTY_FOLIO
 	.dirty_folio	= filemap_dirty_folio,
 #endif
+#ifdef HAVE_VFS_MIGRATE_FOLIO
+	.migrate_folio	= migrate_folio,
+#else
+	.migrate_page	= migrate_page,
+#endif
 };
 
 const struct file_operations zpl_file_operations = {