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Commit bdd5a46f authored by Amir Goldstein's avatar Amir Goldstein Committed by Jan Kara
Browse files

fanotify: add BUILD_BUG_ON() to count the bits of fanotify constants 



Also define the FANOTIFY_EVENT_FLAGS consisting of the extra flags
FAN_ONDIR and FAN_ON_CHILD.

Signed-off-by: default avatarAmir Goldstein <amir73il@gmail.com>
Signed-off-by: default avatarJan Kara <jack@suse.cz>
parent a39f7ec4

fs/notify/fanotify/fanotify.c

+2 −0
Original line number Diff line number Diff line
@@ -205,6 +205,8 @@ static int fanotify_handle_event(struct fsnotify_group *group, 
	BUILD_BUG_ON(FAN_ACCESS_PERM != FS_ACCESS_PERM);

	BUILD_BUG_ON(FAN_ONDIR != FS_ISDIR);



	BUILD_BUG_ON(HWEIGHT32(ALL_FANOTIFY_EVENT_BITS) != 10);



	if (!fanotify_should_send_event(iter_info, mask, data, data_type))

		return 0;

fs/notify/fanotify/fanotify_user.c

+4 −1
Original line number Diff line number Diff line
@@ -803,7 +803,7 @@ static int do_fanotify_mark(int fanotify_fd, unsigned int flags, __u64 mask, 
	struct fsnotify_group *group;

	struct fd f;

	struct path path;

	u32 valid_mask = FANOTIFY_EVENTS | FAN_EVENT_ON_CHILD | FAN_ONDIR;

	u32 valid_mask = FANOTIFY_EVENTS | FANOTIFY_EVENT_FLAGS;

	unsigned int mark_type = flags & FANOTIFY_MARK_TYPE_BITS;

	int ret;
@@ -944,6 +944,9 @@ COMPAT_SYSCALL_DEFINE6(fanotify_mark, 
 */

static int __init fanotify_user_setup(void)

{

	BUILD_BUG_ON(HWEIGHT32(FANOTIFY_INIT_FLAGS) != 6);

	BUILD_BUG_ON(HWEIGHT32(FANOTIFY_MARK_FLAGS) != 9);



	fanotify_mark_cache = KMEM_CACHE(fsnotify_mark,

					 SLAB_PANIC|SLAB_ACCOUNT);

	fanotify_event_cachep = KMEM_CACHE(fanotify_event_info, SLAB_PANIC);

include/linux/fanotify.h

+6 −0
Original line number Diff line number Diff line
@@ -41,11 +41,17 @@ 
/* Events that require a permission response from user */

#define FANOTIFY_PERM_EVENTS	(FAN_OPEN_PERM | FAN_ACCESS_PERM)



/* Extra flags that may be reported with event or control handling of events */

#define FANOTIFY_EVENT_FLAGS	(FAN_EVENT_ON_CHILD | FAN_ONDIR)



/* Events that may be reported to user */

#define FANOTIFY_OUTGOING_EVENTS	(FANOTIFY_EVENTS | \

					 FANOTIFY_PERM_EVENTS | \

					 FAN_Q_OVERFLOW)



#define ALL_FANOTIFY_EVENT_BITS		(FANOTIFY_OUTGOING_EVENTS | \

					 FANOTIFY_EVENT_FLAGS)



/* Do not use these old uapi constants internally */

#undef FAN_ALL_CLASS_BITS

#undef FAN_ALL_INIT_FLAGS