fsnotify: switch send_to_group() and ->handle_event to const struct qstr *

note that conditions surrounding accesses to dname in audit_watch_handle_event()
and audit_mark_handle_event() guarantee that dname won't have been NULL.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/notify/dnotify/dnotify.c b/fs/notify/dnotify/dnotify.c
index 58d77dc..250369d 100644
--- a/fs/notify/dnotify/dnotify.c
+++ b/fs/notify/dnotify/dnotify.c
@@ -81,7 +81,7 @@
 static int dnotify_handle_event(struct fsnotify_group *group,
 				struct inode *inode,
 				u32 mask, const void *data, int data_type,
-				const unsigned char *file_name, u32 cookie,
+				const struct qstr *file_name, u32 cookie,
 				struct fsnotify_iter_info *iter_info)
 {
 	struct fsnotify_mark *inode_mark = fsnotify_iter_inode_mark(iter_info);
diff --git a/fs/notify/fanotify/fanotify.c b/fs/notify/fanotify/fanotify.c
index 6b9c275..a34d7e0 100644
--- a/fs/notify/fanotify/fanotify.c
+++ b/fs/notify/fanotify/fanotify.c
@@ -361,7 +361,7 @@
 static int fanotify_handle_event(struct fsnotify_group *group,
 				 struct inode *inode,
 				 u32 mask, const void *data, int data_type,
-				 const unsigned char *file_name, u32 cookie,
+				 const struct qstr *file_name, u32 cookie,
 				 struct fsnotify_iter_info *iter_info)
 {
 	int ret = 0;
diff --git a/fs/notify/fsnotify.c b/fs/notify/fsnotify.c
index 9cbb5ae..5433e37 100644
--- a/fs/notify/fsnotify.c
+++ b/fs/notify/fsnotify.c
@@ -195,7 +195,7 @@
 static int send_to_group(struct inode *to_tell,
 			 __u32 mask, const void *data,
 			 int data_is, u32 cookie,
-			 const unsigned char *file_name,
+			 const struct qstr *file_name,
 			 struct fsnotify_iter_info *iter_info)
 {
 	struct fsnotify_group *group = NULL;
@@ -379,7 +379,7 @@
 	 */
 	while (fsnotify_iter_select_report_types(&iter_info)) {
 		ret = send_to_group(to_tell, mask, data, data_is, cookie,
-				    file_name->name, &iter_info);
+				    file_name, &iter_info);
 
 		if (ret && (mask & ALL_FSNOTIFY_PERM_EVENTS))
 			goto out;
diff --git a/fs/notify/inotify/inotify.h b/fs/notify/inotify/inotify.h
index 74ae6030..3f246f7 100644
--- a/fs/notify/inotify/inotify.h
+++ b/fs/notify/inotify/inotify.h
@@ -27,7 +27,7 @@
 extern int inotify_handle_event(struct fsnotify_group *group,
 				struct inode *inode,
 				u32 mask, const void *data, int data_type,
-				const unsigned char *file_name, u32 cookie,
+				const struct qstr *file_name, u32 cookie,
 				struct fsnotify_iter_info *iter_info);
 
 extern const struct fsnotify_ops inotify_fsnotify_ops;
diff --git a/fs/notify/inotify/inotify_fsnotify.c b/fs/notify/inotify/inotify_fsnotify.c
index ff30abd..e87f012c 100644
--- a/fs/notify/inotify/inotify_fsnotify.c
+++ b/fs/notify/inotify/inotify_fsnotify.c
@@ -67,7 +67,7 @@
 int inotify_handle_event(struct fsnotify_group *group,
 			 struct inode *inode,
 			 u32 mask, const void *data, int data_type,
-			 const unsigned char *file_name, u32 cookie,
+			 const struct qstr *file_name, u32 cookie,
 			 struct fsnotify_iter_info *iter_info)
 {
 	struct fsnotify_mark *inode_mark = fsnotify_iter_inode_mark(iter_info);
@@ -89,7 +89,7 @@
 			return 0;
 	}
 	if (file_name) {
-		len = strlen(file_name);
+		len = strlen(file_name->name);
 		alloc_len += len + 1;
 	}
 
@@ -129,7 +129,7 @@
 	event->sync_cookie = cookie;
 	event->name_len = len;
 	if (len)
-		strcpy(event->name, file_name);
+		strcpy(event->name, file_name->name);
 
 	ret = fsnotify_add_event(group, fsn_event, inotify_merge);
 	if (ret) {
diff --git a/include/linux/fsnotify_backend.h b/include/linux/fsnotify_backend.h
index 7eb7821..c28f6ed 100644
--- a/include/linux/fsnotify_backend.h
+++ b/include/linux/fsnotify_backend.h
@@ -117,7 +117,7 @@
 	int (*handle_event)(struct fsnotify_group *group,
 			    struct inode *inode,
 			    u32 mask, const void *data, int data_type,
-			    const unsigned char *file_name, u32 cookie,
+			    const struct qstr *file_name, u32 cookie,
 			    struct fsnotify_iter_info *iter_info);
 	void (*free_group_priv)(struct fsnotify_group *group);
 	void (*freeing_mark)(struct fsnotify_mark *mark, struct fsnotify_group *group);
diff --git a/kernel/audit_fsnotify.c b/kernel/audit_fsnotify.c
index 37ae95c..fb24180 100644
--- a/kernel/audit_fsnotify.c
+++ b/kernel/audit_fsnotify.c
@@ -164,7 +164,7 @@
 static int audit_mark_handle_event(struct fsnotify_group *group,
 				    struct inode *to_tell,
 				    u32 mask, const void *data, int data_type,
-				    const unsigned char *dname, u32 cookie,
+				    const struct qstr *dname, u32 cookie,
 				    struct fsnotify_iter_info *iter_info)
 {
 	struct fsnotify_mark *inode_mark = fsnotify_iter_inode_mark(iter_info);
@@ -188,7 +188,7 @@
 	}
 
 	if (mask & (FS_CREATE|FS_MOVED_TO|FS_DELETE|FS_MOVED_FROM)) {
-		if (audit_compare_dname_path(dname, audit_mark->path, AUDIT_NAME_FULL))
+		if (audit_compare_dname_path(dname->name, audit_mark->path, AUDIT_NAME_FULL))
 			return 0;
 		audit_update_mark(audit_mark, inode);
 	} else if (mask & (FS_DELETE_SELF|FS_UNMOUNT|FS_MOVE_SELF))
diff --git a/kernel/audit_tree.c b/kernel/audit_tree.c
index abfb112..e49c912 100644
--- a/kernel/audit_tree.c
+++ b/kernel/audit_tree.c
@@ -1040,7 +1040,7 @@
 static int audit_tree_handle_event(struct fsnotify_group *group,
 				   struct inode *to_tell,
 				   u32 mask, const void *data, int data_type,
-				   const unsigned char *file_name, u32 cookie,
+				   const struct qstr *file_name, u32 cookie,
 				   struct fsnotify_iter_info *iter_info)
 {
 	return 0;
diff --git a/kernel/audit_watch.c b/kernel/audit_watch.c
index e8d1ade..3c12fd5 100644
--- a/kernel/audit_watch.c
+++ b/kernel/audit_watch.c
@@ -482,7 +482,7 @@
 static int audit_watch_handle_event(struct fsnotify_group *group,
 				    struct inode *to_tell,
 				    u32 mask, const void *data, int data_type,
-				    const unsigned char *dname, u32 cookie,
+				    const struct qstr *dname, u32 cookie,
 				    struct fsnotify_iter_info *iter_info)
 {
 	struct fsnotify_mark *inode_mark = fsnotify_iter_inode_mark(iter_info);
@@ -507,9 +507,9 @@
 	}
 
 	if (mask & (FS_CREATE|FS_MOVED_TO) && inode)
-		audit_update_watch(parent, dname, inode->i_sb->s_dev, inode->i_ino, 0);
+		audit_update_watch(parent, dname->name, inode->i_sb->s_dev, inode->i_ino, 0);
 	else if (mask & (FS_DELETE|FS_MOVED_FROM))
-		audit_update_watch(parent, dname, AUDIT_DEV_UNSET, AUDIT_INO_UNSET, 1);
+		audit_update_watch(parent, dname->name, AUDIT_DEV_UNSET, AUDIT_INO_UNSET, 1);
 	else if (mask & (FS_DELETE_SELF|FS_UNMOUNT|FS_MOVE_SELF))
 		audit_remove_parent_watches(parent);