fsnotify: use type id to identify connector object type

An fsnotify_mark_connector is referencing a single type of object
(either inode or vfsmount). Instead of storing a type mask in
connector->flags, store a single type id in connector->type to
identify the type of object.

When a connector object is detached from the object, its type is set
to FSNOTIFY_OBJ_TYPE_DETACHED and this object is not going to be
reused.

The function fsnotify_clear_marks_by_group() is the only place where
type mask was used, so use type flags instead of type id to this
function.

This change is going to be more convenient when adding a new object
type (super block).

Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>

3 files changed, 18 insertions, 19 deletions

diff --git a/fs/notify/fdinfo.c b/fs/notify/fdinfo.c
index d478629..10aac19 100644
--- a/fs/notify/fdinfo.c
+++ b/fs/notify/fdinfo.c
@@ -77,7 +77,7 @@ static void inotify_fdinfo(struct seq_file *m, struct fsnotify_mark *mark)
 	struct inotify_inode_mark *inode_mark;
 	struct inode *inode;
 
-	if (!(mark->connector->flags & FSNOTIFY_OBJ_TYPE_INODE))
+	if (mark->connector->type != FSNOTIFY_OBJ_TYPE_INODE)
 		return;
 
 	inode_mark = container_of(mark, struct inotify_inode_mark, fsn_mark);
@@ -116,7 +116,7 @@ static void fanotify_fdinfo(struct seq_file *m, struct fsnotify_mark *mark)
 	if (mark->flags & FSNOTIFY_MARK_FLAG_IGNORED_SURV_MODIFY)
 		mflags |= FAN_MARK_IGNORED_SURV_MODIFY;
 
-	if (mark->connector->flags & FSNOTIFY_OBJ_TYPE_INODE) {
+	if (mark->connector->type == FSNOTIFY_OBJ_TYPE_INODE) {
 		inode = igrab(mark->connector->inode);
 		if (!inode)
 			return;
@@ -126,7 +126,7 @@ static void fanotify_fdinfo(struct seq_file *m, struct fsnotify_mark *mark)
 		show_mark_fhandle(m, inode);
 		seq_putc(m, '\n');
 		iput(inode);
-	} else if (mark->connector->flags & FSNOTIFY_OBJ_TYPE_VFSMOUNT) {
+	} else if (mark->connector->type == FSNOTIFY_OBJ_TYPE_VFSMOUNT) {
 		struct mount *mnt = real_mount(mark->connector->mnt);
 
 		seq_printf(m, "fanotify mnt_id:%x mflags:%x mask:%x ignored_mask:%x\n",
diff --git a/fs/notify/group.c b/fs/notify/group.c
index b7a4b6a..aa5468f2 100644
--- a/fs/notify/group.c
+++ b/fs/notify/group.c
@@ -67,7 +67,7 @@ void fsnotify_destroy_group(struct fsnotify_group *group)
 	fsnotify_group_stop_queueing(group);
 
 	/* Clear all marks for this group and queue them for destruction */
-	fsnotify_clear_marks_by_group(group, FSNOTIFY_OBJ_ALL_TYPES);
+	fsnotify_clear_marks_by_group(group, FSNOTIFY_OBJ_ALL_TYPES_MASK);
 
 	/*
 	 * Some marks can still be pinned when waiting for response from
diff --git a/fs/notify/mark.c b/fs/notify/mark.c
index e9191b4..ef44808 100644
--- a/fs/notify/mark.c
+++ b/fs/notify/mark.c
@@ -119,9 +119,9 @@ static void __fsnotify_recalc_mask(struct fsnotify_mark_connector *conn)
 		if (mark->flags & FSNOTIFY_MARK_FLAG_ATTACHED)
 			new_mask |= mark->mask;
 	}
-	if (conn->flags & FSNOTIFY_OBJ_TYPE_INODE)
+	if (conn->type == FSNOTIFY_OBJ_TYPE_INODE)
 		conn->inode->i_fsnotify_mask = new_mask;
-	else if (conn->flags & FSNOTIFY_OBJ_TYPE_VFSMOUNT)
+	else if (conn->type == FSNOTIFY_OBJ_TYPE_VFSMOUNT)
 		real_mount(conn->mnt)->mnt_fsnotify_mask = new_mask;
 }
 
@@ -139,7 +139,7 @@ void fsnotify_recalc_mask(struct fsnotify_mark_connector *conn)
 	spin_lock(&conn->lock);
 	__fsnotify_recalc_mask(conn);
 	spin_unlock(&conn->lock);
-	if (conn->flags & FSNOTIFY_OBJ_TYPE_INODE)
+	if (conn->type == FSNOTIFY_OBJ_TYPE_INODE)
 		__fsnotify_update_child_dentry_flags(conn->inode);
 }
 
@@ -166,18 +166,18 @@ static struct inode *fsnotify_detach_connector_from_object(
 {
 	struct inode *inode = NULL;
 
-	if (conn->flags & FSNOTIFY_OBJ_TYPE_INODE) {
+	if (conn->type == FSNOTIFY_OBJ_TYPE_INODE) {
 		inode = conn->inode;
 		rcu_assign_pointer(inode->i_fsnotify_marks, NULL);
 		inode->i_fsnotify_mask = 0;
 		conn->inode = NULL;
-		conn->flags &= ~FSNOTIFY_OBJ_TYPE_INODE;
-	} else if (conn->flags & FSNOTIFY_OBJ_TYPE_VFSMOUNT) {
+		conn->type = FSNOTIFY_OBJ_TYPE_DETACHED;
+	} else if (conn->type == FSNOTIFY_OBJ_TYPE_VFSMOUNT) {
 		rcu_assign_pointer(real_mount(conn->mnt)->mnt_fsnotify_marks,
 				   NULL);
 		real_mount(conn->mnt)->mnt_fsnotify_mask = 0;
 		conn->mnt = NULL;
-		conn->flags &= ~FSNOTIFY_OBJ_TYPE_VFSMOUNT;
+		conn->type = FSNOTIFY_OBJ_TYPE_DETACHED;
 	}
 
 	return inode;
@@ -442,10 +442,10 @@ static int fsnotify_attach_connector_to_object(
 	spin_lock_init(&conn->lock);
 	INIT_HLIST_HEAD(&conn->list);
 	if (inode) {
-		conn->flags = FSNOTIFY_OBJ_TYPE_INODE;
+		conn->type = FSNOTIFY_OBJ_TYPE_INODE;
 		conn->inode = igrab(inode);
 	} else {
-		conn->flags = FSNOTIFY_OBJ_TYPE_VFSMOUNT;
+		conn->type = FSNOTIFY_OBJ_TYPE_VFSMOUNT;
 		conn->mnt = mnt;
 	}
 	/*
@@ -479,8 +479,7 @@ static struct fsnotify_mark_connector *fsnotify_grab_connector(
 	if (!conn)
 		goto out;
 	spin_lock(&conn->lock);
-	if (!(conn->flags & (FSNOTIFY_OBJ_TYPE_INODE |
-			     FSNOTIFY_OBJ_TYPE_VFSMOUNT))) {
+	if (conn->type == FSNOTIFY_OBJ_TYPE_DETACHED) {
 		spin_unlock(&conn->lock);
 		srcu_read_unlock(&fsnotify_mark_srcu, idx);
 		return NULL;
@@ -646,16 +645,16 @@ struct fsnotify_mark *fsnotify_find_mark(
 	return NULL;
 }
 
-/* Clear any marks in a group with given type */
+/* Clear any marks in a group with given type mask */
 void fsnotify_clear_marks_by_group(struct fsnotify_group *group,
-				   unsigned int type)
+				   unsigned int type_mask)
 {
 	struct fsnotify_mark *lmark, *mark;
 	LIST_HEAD(to_free);
 	struct list_head *head = &to_free;
 
 	/* Skip selection step if we want to clear all marks. */
-	if (type == FSNOTIFY_OBJ_ALL_TYPES) {
+	if (type_mask == FSNOTIFY_OBJ_ALL_TYPES_MASK) {
 		head = &group->marks_list;
 		goto clear;
 	}
@@ -670,7 +669,7 @@ void fsnotify_clear_marks_by_group(struct fsnotify_group *group,
 	 */
 	mutex_lock_nested(&group->mark_mutex, SINGLE_DEPTH_NESTING);
 	list_for_each_entry_safe(mark, lmark, &group->marks_list, g_list) {
-		if (mark->connector->flags & type)
+		if ((1U << mark->connector->type) & type_mask)
 			list_move(&mark->g_list, &to_free);
 	}
 	mutex_unlock(&group->mark_mutex);