Provide vfs suspension support only for filesystems which need it.

Need is expressed by providing vfs_susp_clean function in vfsops.

Differential Revision:	D952
Reviewed by:	kib (previous version)
MFC after:	2 weeks

1 files changed, 9 insertions, 0 deletions

diff --git a/sys/fs/tmpfs/tmpfs_vfsops.c b/sys/fs/tmpfs/tmpfs_vfsops.c
index cb4a32b..f0bb96b 100644
--- a/sys/fs/tmpfs/tmpfs_vfsops.c
+++ b/sys/fs/tmpfs/tmpfs_vfsops.c
@@ -427,6 +427,14 @@ tmpfs_sync(struct mount *mp, int waitfor)
 }
 
 /*
+ * A stub created so that vfs does vn_start_write for this filesystem
+ */
+static void
+tmpfs_susp_clean(struct mount *mp)
+{
+}
+
+/*
  * tmpfs vfs operations.
  */
 
@@ -437,5 +445,6 @@ struct vfsops tmpfs_vfsops = {
 	.vfs_statfs =			tmpfs_statfs,
 	.vfs_fhtovp =			tmpfs_fhtovp,
 	.vfs_sync =			tmpfs_sync,
+	.vfs_susp_clean =		tmpfs_susp_clean,
 };
 VFS_SET(tmpfs_vfsops, tmpfs, VFCF_JAIL);