f2fs: support xattr security labels

This patch adds the support of security labels for f2fs, which will be used
by Linus Security Models (LSMs).

Quote from http://en.wikipedia.org/wiki/Linux_Security_Modules:
"Linux Security Modules (LSM) is a framework that allows the Linux kernel to
support a variety of computer security models while avoiding favoritism toward
any single security implementation. The framework is licensed under the terms of
the GNU General Public License and is standard part of the Linux kernel since
Linux 2.6. AppArmor, SELinux, Smack and TOMOYO Linux are the currently accepted
modules in the official kernel.".

Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>

1 files changed, 16 insertions, 8 deletions

diff --git a/fs/f2fs/xattr.h b/fs/f2fs/xattr.h
index 49c9558..3c0817b 100644
--- a/fs/f2fs/xattr.h
+++ b/fs/f2fs/xattr.h
@@ -112,21 +112,19 @@ extern const struct xattr_handler f2fs_xattr_trusted_handler;
 extern const struct xattr_handler f2fs_xattr_acl_access_handler;
 extern const struct xattr_handler f2fs_xattr_acl_default_handler;
 extern const struct xattr_handler f2fs_xattr_advise_handler;
+extern const struct xattr_handler f2fs_xattr_security_handler;
 
 extern const struct xattr_handler *f2fs_xattr_handlers[];
 
-extern int f2fs_setxattr(struct inode *inode, int name_index, const char *name,
-		const void *value, size_t value_len);
-extern int f2fs_getxattr(struct inode *inode, int name_index, const char *name,
-		void *buffer, size_t buffer_size);
-extern ssize_t f2fs_listxattr(struct dentry *dentry, char *buffer,
-		size_t buffer_size);
-
+extern int f2fs_setxattr(struct inode *, int, const char *,
+				const void *, size_t, struct page *);
+extern int f2fs_getxattr(struct inode *, int, const char *, void *, size_t);
+extern ssize_t f2fs_listxattr(struct dentry *, char *, size_t);
 #else
 
 #define f2fs_xattr_handlers	NULL
 static inline int f2fs_setxattr(struct inode *inode, int name_index,
-	const char *name, const void *value, size_t value_len)
+		const char *name, const void *value, size_t value_len)
 {
 	return -EOPNOTSUPP;
 }
@@ -142,4 +140,14 @@ static inline ssize_t f2fs_listxattr(struct dentry *dentry, char *buffer,
 }
 #endif
 
+#ifdef CONFIG_F2FS_FS_SECURITY
+extern int f2fs_init_security(struct inode *, struct inode *,
+				const struct qstr *, struct page *);
+#else
+static inline int f2fs_init_security(struct inode *inode, struct inode *dir,
+				const struct qstr *qstr, struct page *ipage)
+{
+	return 0;
+}
+#endif
 #endif /* __F2FS_XATTR_H__ */