summaryrefslogtreecommitdiff
path: root/fs/notify/fanotify/fanotify.h
blob: 898b5b2bc1c70d8011661beec22cb37eab6f12a8 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
/* SPDX-License-Identifier: GPL-2.0 */
#include <linux/fsnotify_backend.h>
#include <linux/path.h>
#include <linux/slab.h>

extern struct kmem_cache *fanotify_mark_cache;
extern struct kmem_cache *fanotify_event_cachep;
extern struct kmem_cache *fanotify_perm_event_cachep;

/*
 * Structure for normal fanotify events. It gets allocated in
 * fanotify_handle_event() and freed when the information is retrieved by
 * userspace
 */
struct fanotify_event {
	struct fsnotify_event fse;
	u32 mask;
	/*
	 * We hold ref to this path so it may be dereferenced at any point
	 * during this object's lifetime
	 */
	struct path path;
	struct pid *pid;
};

/*
 * Structure for permission fanotify events. It gets allocated and freed in
 * fanotify_handle_event() since we wait there for user response. When the
 * information is retrieved by userspace the structure is moved from
 * group->notification_list to group->fanotify_data.access_list to wait for
 * user response.
 */
struct fanotify_perm_event {
	struct fanotify_event fae;
	int response;	/* userspace answer to question */
	int fd;		/* fd we passed to userspace for this event */
};

static inline struct fanotify_perm_event *
FANOTIFY_PE(struct fsnotify_event *fse)
{
	return container_of(fse, struct fanotify_perm_event, fae.fse);
}

static inline bool fanotify_is_perm_event(u32 mask)
{
	return IS_ENABLED(CONFIG_FANOTIFY_ACCESS_PERMISSIONS) &&
		mask & FANOTIFY_PERM_EVENTS;
}

static inline struct fanotify_event *FANOTIFY_E(struct fsnotify_event *fse)
{
	return container_of(fse, struct fanotify_event, fse);
}

struct fanotify_event *fanotify_alloc_event(struct fsnotify_group *group,
						 struct inode *inode, u32 mask,
						 const struct path *path);