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authorJosef "Jeff" Sipek <jsipek@cs.sunysb.edu>2006-12-08 02:36:31 -0800
committerLinus Torvalds <torvalds@woody.osdl.org>2006-12-08 08:28:40 -0800
commit42cf11939becc717bd125d121a1a23415106a099 (patch)
treed9c0c66e3f01287fd7da6315c1a4df7c3fd9d05b /include/linux/fs_stack.h
parent17b3cff079721bbc45e9d6de2fa3edb73561e27d (diff)
[PATCH] fsstack: Introduce fsstack_copy_{attr,inode}_*
Introduce several fsstack_copy_* functions which allow stackable filesystems (such as eCryptfs and Unionfs) to easily copy over (currently only) inode attributes. This prevents code duplication and allows for code reuse. [akpm@osdl.org: Remove unneeded wrapper] [bunk@stusta.de: fs/stack.c should #include <linux/fs_stack.h>] Signed-off-by: Josef "Jeff" Sipek <jsipek@cs.sunysb.edu> Cc: Michael Halcrow <mhalcrow@us.ibm.com> Signed-off-by: Adrian Bunk <bunk@stusta.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/linux/fs_stack.h')
-rw-r--r--include/linux/fs_stack.h31
1 files changed, 31 insertions, 0 deletions
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 */