3 files changed, 73 insertions, 1 deletions

diff --git a/fs/Makefile b/fs/Makefile
index 9a5ce9323bfd..b9ffa63f77fc 100644
--- a/fs/Makefile
+++ b/fs/Makefile
@@ -10,7 +10,8 @@ obj-y :=	open.o read_write.o file_table.o super.o \
                 ioctl.o readdir.o select.o fifo.o locks.o dcache.o inode.o \
                 attr.o bad_inode.o file.o filesystems.o namespace.o aio.o \
                 seq_file.o xattr.o libfs.o fs-writeback.o \
-                pnode.o drop_caches.o splice.o sync.o utimes.o
+                pnode.o drop_caches.o splice.o sync.o utimes.o \
+                stack.o
 
 ifeq ($(CONFIG_BLOCK),y)
 obj-y +=        buffer.o bio.o block_dev.o direct-io.o mpage.o ioprio.o
diff --git a/fs/stack.c b/fs/stack.c
new file mode 100644
index 000000000000..5ddbc34535f9
--- /dev/null
+++ b/fs/stack.c
@@ -0,0 +1,40 @@
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/fs_stack.h>
+
+/* does _NOT_ require i_mutex to be held.
+ *
+ * This function cannot be inlined since i_size_{read,write} is rather
+ * heavy-weight on 32-bit systems
+ */
+void fsstack_copy_inode_size(struct inode *dst, const struct inode *src)
+{
+        i_size_write(dst, i_size_read((struct inode *)src));
+        dst->i_blocks = src->i_blocks;
+}
+EXPORT_SYMBOL_GPL(fsstack_copy_inode_size);
+
+/* copy all attributes; get_nlinks is optional way to override the i_nlink
+ * copying
+ */
+void fsstack_copy_attr_all(struct inode *dest, const struct inode *src,
+                                int (*get_nlinks)(struct inode *))
+{
+        if (!get_nlinks)
+                dest->i_nlink = src->i_nlink;
+        else
+                dest->i_nlink = (*get_nlinks)(dest);
+
+        dest->i_mode = src->i_mode;
+        dest->i_uid = src->i_uid;
+        dest->i_gid = src->i_gid;
+        dest->i_rdev = src->i_rdev;
+        dest->i_atime = src->i_atime;
+        dest->i_mtime = src->i_mtime;
+        dest->i_ctime = src->i_ctime;
+        dest->i_blkbits = src->i_blkbits;
+        dest->i_flags = src->i_flags;
+
+        fsstack_copy_inode_size(dest, src);
+}
+EXPORT_SYMBOL_GPL(fsstack_copy_attr_all);
diff --git a/include/linux/fs_stack.h b/include/linux/fs_stack.h
new file mode 100644
index 000000000000..bb516ceeefc9
--- /dev/null
+++ b/include/linux/fs_stack.h
@@ -0,0 +1,31 @@
+#ifndef _LINUX_FS_STACK_H
+#define _LINUX_FS_STACK_H
+
+/* This file defines generic functions used primarily by stackable
+ * filesystems; none of these functions require i_mutex to be held.
+ */
+
+#include <linux/fs.h>
+
+/* externs for fs/stack.c */
+extern void fsstack_copy_attr_all(struct inode *dest, const struct inode *src,
+                                int (*get_nlinks)(struct inode *));
+
+extern void fsstack_copy_inode_size(struct inode *dst, const struct inode *src);
+
+/* inlines */
+static inline void fsstack_copy_attr_atime(struct inode *dest,
+                                           const struct inode *src)
+{
+        dest->i_atime = src->i_atime;
+}
+
+static inline void fsstack_copy_attr_times(struct inode *dest,
+                                           const struct inode *src)
+{
+        dest->i_atime = src->i_atime;
+        dest->i_mtime = src->i_mtime;
+        dest->i_ctime = src->i_ctime;
+}
+
+#endif /* _LINUX_FS_STACK_H */