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authorAmir Goldstein <amir73il@gmail.com>2020-07-16 11:42:09 +0300
committerJan Kara <jack@suse.cz>2020-07-27 21:23:36 +0200
commit0badfa029e5fd6d5462adb767937319335637c83 (patch)
tree601cf56c89b887449a9acc1fddfb570ecc2ca58e /fs/notify
parent08b95c338e0c5a96e47f4ca314ea1e7580ecb5d7 (diff)
fanotify: generalize the handling of extra event flags
In fanotify_group_event_mask() there is logic in place to make sure we are not going to handle an event with no type and just FAN_ONDIR flag. Generalize this logic to any FANOTIFY_EVENT_FLAGS. There is only one more flag in this group at the moment - FAN_EVENT_ON_CHILD. We never report it to user, but we do pass it in to fanotify_alloc_event() when group is reporting fid as indication that event happened on child. We will have use for this indication later on. Link: https://lore.kernel.org/r/20200716084230.30611-2-amir73il@gmail.com Signed-off-by: Amir Goldstein <amir73il@gmail.com> Signed-off-by: Jan Kara <jack@suse.cz>
Diffstat (limited to 'fs/notify')
-rw-r--r--fs/notify/fanotify/fanotify.c15
1 files changed, 10 insertions, 5 deletions
diff --git a/fs/notify/fanotify/fanotify.c b/fs/notify/fanotify/fanotify.c
index e6ba605732d7..110835a9bf99 100644
--- a/fs/notify/fanotify/fanotify.c
+++ b/fs/notify/fanotify/fanotify.c
@@ -211,7 +211,8 @@ static u32 fanotify_group_event_mask(struct fsnotify_group *group,
int data_type)
{
__u32 marks_mask = 0, marks_ignored_mask = 0;
- __u32 test_mask, user_mask = FANOTIFY_OUTGOING_EVENTS;
+ __u32 test_mask, user_mask = FANOTIFY_OUTGOING_EVENTS |
+ FANOTIFY_EVENT_FLAGS;
const struct path *path = fsnotify_data_path(data, data_type);
struct fsnotify_mark *mark;
int type;
@@ -264,14 +265,18 @@ static u32 fanotify_group_event_mask(struct fsnotify_group *group,
*
* For backward compatibility and consistency, do not report FAN_ONDIR
* to user in legacy fanotify mode (reporting fd) and report FAN_ONDIR
- * to user in FAN_REPORT_FID mode for all event types.
+ * to user in fid mode for all event types.
+ *
+ * We never report FAN_EVENT_ON_CHILD to user, but we do pass it in to
+ * fanotify_alloc_event() when group is reporting fid as indication
+ * that event happened on child.
*/
if (FAN_GROUP_FLAG(group, FAN_REPORT_FID)) {
- /* Do not report FAN_ONDIR without any event */
- if (!(test_mask & ~FAN_ONDIR))
+ /* Do not report event flags without any event */
+ if (!(test_mask & ~FANOTIFY_EVENT_FLAGS))
return 0;
} else {
- user_mask &= ~FAN_ONDIR;
+ user_mask &= ~FANOTIFY_EVENT_FLAGS;
}
return test_mask & user_mask;