[XFS] move sync code to its own file

The sync code in XFS is spread around several files. While it used to make
sense to have such a distribution, the code is about to be cleaned up and
so centralising it in one spot as the first step makes sense.

SGI-PV: 988139

SGI-Modid: xfs-linux-melb:xfs-kern:32282a
Signed-off-by: David Chinner <david@fromorbit.com>
Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>
Signed-off-by: Christoph Hellwig <hch@infradead.org>

fs/xfs/Makefile

@@ -107,6 +107,7 @@ xfs-y				+= $(addprefix $(XFS_LINUX)/, \
 				   xfs_iops.o \
 				   xfs_lrw.o \
 				   xfs_super.o \
+				   xfs_sync.o \
 				   xfs_vnode.o \
 				   xfs_xattr.o)
 

fs/xfs/linux-2.6/xfs_super.c

@@ -59,6 +59,7 @@
 #include "xfs_extfree_item.h"
 #include "xfs_mru_cache.h"
 #include "xfs_inode_item.h"
+#include "xfs_sync.h"
 
 #include <linux/namei.h>
 #include <linux/init.h>

fs/xfs/linux-2.6/xfs_sync.h

+#ifndef XFS_SYNC_H
+#define XFS_SYNC_H 1
+
+int xfs_sync(struct xfs_mount *mp, int flags);
+int xfs_syncsub(struct xfs_mount *mp, int flags, int *bypassed);
+
+#endif

fs/xfs/xfs_vfsops.h

@@ -8,7 +8,6 @@ struct kstatfs;
 struct xfs_mount;
 struct xfs_mount_args;
 
-int xfs_sync(struct xfs_mount *mp, int flags);
 void xfs_do_force_shutdown(struct xfs_mount *mp, int flags, char *fname,
 		int lnnum);
 void xfs_attr_quiesce(struct xfs_mount *mp);