constify security_sb_pivotroot()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

include/linux/lsm_hooks.h

@@ -1346,7 +1346,7 @@ union security_list_options {
 	int (*sb_mount)(const char *dev_name, const struct path *path,
 			const char *type, unsigned long flags, void *data);
 	int (*sb_umount)(struct vfsmount *mnt, int flags);
-	int (*sb_pivotroot)(struct path *old_path, struct path *new_path);
+	int (*sb_pivotroot)(const struct path *old_path, const struct path *new_path);
 	int (*sb_set_mnt_opts)(struct super_block *sb,
 				struct security_mnt_opts *opts,
 				unsigned long kern_flags,

include/linux/security.h

@@ -225,7 +225,7 @@ int security_sb_statfs(struct dentry *dentry);
 int security_sb_mount(const char *dev_name, const struct path *path,
 		      const char *type, unsigned long flags, void *data);
 int security_sb_umount(struct vfsmount *mnt, int flags);
-int security_sb_pivotroot(struct path *old_path, struct path *new_path);
+int security_sb_pivotroot(const struct path *old_path, const struct path *new_path);
 int security_sb_set_mnt_opts(struct super_block *sb,
 				struct security_mnt_opts *opts,
 				unsigned long kern_flags,
@@ -542,8 +542,8 @@ static inline int security_sb_umount(struct vfsmount *mnt, int flags)
 	return 0;
 }
 
-static inline int security_sb_pivotroot(struct path *old_path,
-					struct path *new_path)
+static inline int security_sb_pivotroot(const struct path *old_path,
+					const struct path *new_path)
 {
 	return 0;
 }

security/security.c

@@ -313,7 +313,7 @@ int security_sb_umount(struct vfsmount *mnt, int flags)
 	return call_int_hook(sb_umount, 0, mnt, flags);
 }
 
-int security_sb_pivotroot(struct path *old_path, struct path *new_path)
+int security_sb_pivotroot(const struct path *old_path, const struct path *new_path)
 {
 	return call_int_hook(sb_pivotroot, 0, old_path, new_path);
 }

security/tomoyo/tomoyo.c

@@ -429,7 +429,7 @@ static int tomoyo_sb_umount(struct vfsmount *mnt, int flags)
  *
  * Returns 0 on success, negative value otherwise.
  */
-static int tomoyo_sb_pivotroot(struct path *old_path, struct path *new_path)
+static int tomoyo_sb_pivotroot(const struct path *old_path, const struct path *new_path)
 {
 	return tomoyo_path2_perm(TOMOYO_TYPE_PIVOT_ROOT, new_path, old_path);
 }