fsnotify: remove group->mask

group->mask is now useless.  It was originally a shortcut for fsnotify to
save on performance.  These checks are now redundant, so we remove them.
Signed-off-by: NEric Paris <eparis@redhat.com>

fs/notify/dnotify/dnotify.c

@@ -199,8 +199,6 @@ void dnotify_flush(struct file *filp, fl_owner_t id)
 	if (dn_mark->dn == NULL)
 		fsnotify_destroy_mark(fsn_mark);
 
-	fsnotify_recalc_group_mask(dnotify_group);
-
 	mutex_unlock(&dnotify_mark_mutex);
 
 	fsnotify_put_mark(fsn_mark);
@@ -385,8 +383,6 @@ int fcntl_dirnotify(int fd, struct file *filp, unsigned long arg)
 	if (destroy)
 		fsnotify_destroy_mark(fsn_mark);
 
-	fsnotify_recalc_group_mask(dnotify_group);
-
 	mutex_unlock(&dnotify_mark_mutex);
 	fsnotify_put_mark(fsn_mark);
 out_err:

fs/notify/fanotify/fanotify_user.c

@@ -496,8 +496,6 @@ static int fanotify_remove_vfsmount_mark(struct fsnotify_group *group,
 
 	removed = fanotify_mark_remove_from_mask(fsn_mark, mask, flags);
 	fsnotify_put_mark(fsn_mark);
-	if (removed & group->mask)
-		fsnotify_recalc_group_mask(group);
 	if (removed & mnt->mnt_fsnotify_mask)
 		fsnotify_recalc_vfsmount_mask(mnt);
 
@@ -518,9 +516,6 @@ static int fanotify_remove_inode_mark(struct fsnotify_group *group,
 	removed = fanotify_mark_remove_from_mask(fsn_mark, mask, flags);
 	/* matches the fsnotify_find_inode_mark() */
 	fsnotify_put_mark(fsn_mark);
-
-	if (removed & group->mask)
-		fsnotify_recalc_group_mask(group);
 	if (removed & inode->i_fsnotify_mask)
 		fsnotify_recalc_inode_mask(inode);
 
@@ -572,12 +567,9 @@ static int fanotify_add_vfsmount_mark(struct fsnotify_group *group,
 	}
 	added = fanotify_mark_add_to_mask(fsn_mark, mask, flags);
 	fsnotify_put_mark(fsn_mark);
-	if (added) {
-		if (added & ~group->mask)
-			fsnotify_recalc_group_mask(group);
-		if (added & ~mnt->mnt_fsnotify_mask)
-			fsnotify_recalc_vfsmount_mask(mnt);
-	}
+	if (added & ~mnt->mnt_fsnotify_mask)
+		fsnotify_recalc_vfsmount_mask(mnt);
+
 	return 0;
 }
 
@@ -607,12 +599,8 @@ static int fanotify_add_inode_mark(struct fsnotify_group *group,
 	}
 	added = fanotify_mark_add_to_mask(fsn_mark, mask, flags);
 	fsnotify_put_mark(fsn_mark);
-	if (added) {
-		if (added & ~group->mask)
-			fsnotify_recalc_group_mask(group);
-		if (added & ~inode->i_fsnotify_mask)
-			fsnotify_recalc_inode_mask(inode);
-	}
+	if (added & ~inode->i_fsnotify_mask)
+		fsnotify_recalc_inode_mask(inode);
 	return 0;
 }
 
@@ -734,7 +722,6 @@ SYSCALL_DEFINE(fanotify_mark)(int fanotify_fd, unsigned int flags,
 			fsnotify_clear_vfsmount_marks_by_group(group);
 		else
 			fsnotify_clear_inode_marks_by_group(group);
-		fsnotify_recalc_group_mask(group);
 		break;
 	default:
 		ret = -EINVAL;

fs/notify/group.c

@@ -35,22 +35,6 @@ LIST_HEAD(fsnotify_inode_groups);
 /* all groups registered to receive mount point filesystem notifications */
 LIST_HEAD(fsnotify_vfsmount_groups);
 
-/*
- * Update the group->mask by running all of the marks associated with this
- * group and finding the bitwise | of all of the mark->mask.
- */
-void fsnotify_recalc_group_mask(struct fsnotify_group *group)
-{
-	__u32 mask = 0;
-	struct fsnotify_mark *mark;
-
-	spin_lock(&group->mark_lock);
-	list_for_each_entry(mark, &group->marks_list, g_list)
-		mask |= mark->mask;
-	group->mask = mask;
-	spin_unlock(&group->mark_lock);
-}
-
 void fsnotify_add_vfsmount_group(struct fsnotify_group *group)
 {
 	struct fsnotify_group *group_iter;

fs/notify/inotify/inotify_user.c

@@ -606,16 +606,11 @@ static int inotify_update_existing_watch(struct fsnotify_group *group,
 		int dropped = (old_mask & ~new_mask);
 		/* more bits in this fsn_mark than the inode's mask? */
 		int do_inode = (new_mask & ~inode->i_fsnotify_mask);
-		/* more bits in this fsn_mark than the group? */
-		int do_group = (new_mask & ~group->mask);
 
 		/* update the inode with this new fsn_mark */
 		if (dropped || do_inode)
 			fsnotify_recalc_inode_mask(inode);
 
-		/* update the group mask with the new mask */
-		if (dropped || do_group)
-			fsnotify_recalc_group_mask(group);
 	}
 
 	/* return the wd */
@@ -673,10 +668,6 @@ static int inotify_new_watch(struct fsnotify_group *group,
 	/* return the watch descriptor for this new mark */
 	ret = tmp_i_mark->wd;
 
-	/* if this mark added a new event update the group mask */
-	if (mask & ~group->mask)
-		fsnotify_recalc_group_mask(group);
-
 out_err:
 	/* match the ref from fsnotify_init_mark() */
 	fsnotify_put_mark(&tmp_i_mark->fsn_mark);

include/linux/fsnotify_backend.h

@@ -119,15 +119,6 @@ struct fsnotify_group {
 	 */
 	struct list_head vfsmount_group_list;
 
-	/*
-	 * Defines all of the event types in which this group is interested.
-	 * This mask is a bitwise OR of the FS_* events from above.  Each time
-	 * this mask changes for a group (if it changes) the correct functions
-	 * must be called to update the global structures which indicate global
-	 * interest in event types.
-	 */
-	__u32 mask;
-
 	/*
 	 * How the refcnt is used is up to each group.  When the refcnt hits 0
 	 * fsnotify will clean up all of the resources associated with this group.
@@ -367,8 +358,6 @@ static inline void __fsnotify_d_instantiate(struct dentry *dentry, struct inode
 
 /* get a reference to an existing or create a new group */
 extern struct fsnotify_group *fsnotify_alloc_group(const struct fsnotify_ops *ops);
-/* run all marks associated with this group and update group->mask */
-extern void fsnotify_recalc_group_mask(struct fsnotify_group *group);
 /* drop reference on a group from fsnotify_alloc_group */
 extern void fsnotify_put_group(struct fsnotify_group *group);
 

kernel/audit_watch.c

@@ -164,8 +164,6 @@ static struct audit_parent *audit_init_parent(struct nameidata *ndp)
 		return ERR_PTR(ret);
 	}
 
-	fsnotify_recalc_group_mask(audit_watch_group);
-
 	return parent;
 }
 
@@ -352,9 +350,6 @@ static void audit_remove_parent_watches(struct audit_parent *parent)
 	mutex_unlock(&audit_filter_mutex);
 
 	fsnotify_destroy_mark(&parent->mark);
-
-	fsnotify_recalc_group_mask(audit_watch_group);
-
 }
 
 /* Get path information necessary for adding watches. */
@@ -505,9 +500,6 @@ void audit_remove_watch_rule(struct audit_krule *krule)
 			audit_put_parent(parent);
 		}
 	}
-
-	fsnotify_recalc_group_mask(audit_watch_group);
-
 }
 
 static bool audit_watch_should_send_event(struct fsnotify_group *group, struct inode *inode,