1 /* SPDX-License-Identifier: GPL-2.0 */
43 #define FS_OPEN_EXEC		0x00001000	/* File was opened for exec */
57 #define FS_OPEN_EXEC_PERM	0x00040000	/* open/exec event in a permission hook */
73  * Directory entry modification events - reported only to directory
125  * handle_event - main call for a group to handle an fs event
130  * @dir:	optional directory associated with event -
137  * handle_inode_event - simple variant of handle_event() for groups that only
142  * @dir:	optional directory associated with event -
145  *		Either @inode or @dir must be non-NULL.
149  * free_group_priv - called when a group refcnt hits 0 to clean up the private union
150  * freeing_mark - called when a mark is being destroyed for some reason.  The group
199 	spinlock_t notification_lock;		/* protect the notification_list */
210 	#define FS_PRIO_2	2 /* fanotify pre-content access */
221 	struct mutex mark_mutex;	/* protect marks_list */
266 	mutex_lock(&group->mark_mutex);  in fsnotify_group_lock()
267 	if (group->flags & FSNOTIFY_GROUP_NOFS)  in fsnotify_group_lock()
268 		group->owner_flags = memalloc_nofs_save();  in fsnotify_group_lock()
273 	if (group->flags & FSNOTIFY_GROUP_NOFS)  in fsnotify_group_unlock()
274 		memalloc_nofs_restore(group->owner_flags);  in fsnotify_group_unlock()
275 	mutex_unlock(&group->mark_mutex);  in fsnotify_group_unlock()
280 	WARN_ON_ONCE(!mutex_is_locked(&group->mark_mutex));  in fsnotify_group_assert_locked()
281 	if (group->flags & FSNOTIFY_GROUP_NOFS)  in fsnotify_group_assert_locked()
282 		WARN_ON_ONCE(!(current->flags & PF_MEMALLOC_NOFS));  in fsnotify_group_assert_locked()
308 		return d_inode(((const struct path *)data)->dentry);  in fsnotify_data_inode()
310 		return ((struct fs_error_report *)data)->inode;  in fsnotify_data_inode()
323 		return ((const struct path *)data)->dentry;  in fsnotify_data_dentry()
345 		return ((struct inode *)data)->i_sb;  in fsnotify_data_sb()
347 		return ((struct dentry *)data)->d_sb;  in fsnotify_data_sb()
349 		return ((const struct path *)data)->dentry->d_sb;  in fsnotify_data_sb()
351 		return ((struct fs_error_report *) data)->sb;  in fsnotify_data_sb()
387 	FSNOTIFY_OBJ_TYPE_ANY = -1,
410 	return (iter_info->report_mask & (1U << iter_type));  in fsnotify_iter_should_report_type()
416 	iter_info->report_mask |= (1U << iter_type);  in fsnotify_iter_set_report_type()
423 		return iter_info->marks[iter_type];  in fsnotify_iter_mark()
497  * particular entry. obj_lock means either inode->i_lock or
498  * mnt->mnt_root->d_lock depending on the mark type.
501 	/* Mask this mark is for [mark->lock, group->mark_mutex] */
509 	/* List of marks by group->marks_list. Also reused for queueing
511 	 * before it can be freed. [group->mark_mutex] */
515 	/* List of marks for inode / vfsmount [connector->lock, mark ref] */
519 	/* Events types and flags to ignore [mark->lock, group->mark_mutex] */
533 	unsigned int flags;		/* flags [mark->lock] */
567 	if (!(inode->i_fsnotify_mask & FS_EVENT_ON_CHILD))  in fsnotify_inode_watches_children()
571 	return inode->i_fsnotify_mask & FS_EVENTS_POSS_ON_CHILD;  in fsnotify_inode_watches_children()
576  * filesystem events when those events happens to this dentry->d_inode.
580 	assert_spin_locked(&dentry->d_lock);  in fsnotify_update_flags()
589 	if (fsnotify_inode_watches_children(dentry->d_parent->d_inode))  in fsnotify_update_flags()
590 		dentry->d_flags |= DCACHE_FSNOTIFY_PARENT_WATCHED;  in fsnotify_update_flags()
592 		dentry->d_flags &= ~DCACHE_FSNOTIFY_PARENT_WATCHED;  in fsnotify_update_flags()
633 	fsnotify_add_event(group, group->overflow_event, NULL);  in fsnotify_queue_overflow()
643 	assert_spin_locked(&group->notification_lock);  in fsnotify_notify_queue_is_empty()
645 	return list_empty(&group->notification_list);  in fsnotify_notify_queue_is_empty()
662  * Note the subtle semantic difference from the legacy ->ignored_mask.
663  * ->ignored_mask traditionally only meant which events should be ignored,
664  * while ->ignore_mask also includes flags regarding the type of objects on
669 	__u32 ignore_mask = mark->ignore_mask;  in fsnotify_ignore_mask()
672 	if (mark->flags & FSNOTIFY_MARK_FLAG_HAS_IGNORE_FLAGS)  in fsnotify_ignore_mask()
677 	 * - Always ignore events on dir  in fsnotify_ignore_mask()
678 	 * - Ignore events on child if parent is watching children  in fsnotify_ignore_mask()
682 	ignore_mask |= mark->mask & FS_EVENT_ON_CHILD;  in fsnotify_ignore_mask()
687 /* Legacy ignored_mask - only event types to ignore */
690 	return mark->ignore_mask & ALL_FSNOTIFY_EVENTS;  in fsnotify_ignored_events()
724 	/* For non-dir and non-child, no need to consult the event flags */  in fsnotify_effective_ignore_mask()
738 	__u32 mask = mark->mask;  in fsnotify_calc_mask()
744 	if (!(mark->flags & FSNOTIFY_MARK_FLAG_IGNORED_SURV_MODIFY))  in fsnotify_calc_mask()
751 	return mask | mark->ignore_mask;  in fsnotify_calc_mask()
776 	return fsnotify_add_mark(mark, &inode->i_fsnotify_marks,  in fsnotify_add_inode_mark()
783 	return fsnotify_add_mark_locked(mark, &inode->i_fsnotify_marks,  in fsnotify_add_inode_mark_locked()
821 	INIT_LIST_HEAD(&event->list);  in fsnotify_init_event()