diff options
| -rw-r--r-- | fs/notify/fanotify/fanotify.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/fs/notify/fanotify/fanotify.c b/fs/notify/fanotify/fanotify.c index 50b3abc06215..754e27ead874 100644 --- a/fs/notify/fanotify/fanotify.c +++ b/fs/notify/fanotify/fanotify.c @@ -148,6 +148,9 @@ static bool fanotify_should_merge(struct fanotify_event *old, return false; } +/* Limit event merges to limit CPU overhead per event */ +#define FANOTIFY_MAX_MERGE_EVENTS 128 + /* and the list better be locked by something too! */ static int fanotify_merge(struct fsnotify_group *group, struct fsnotify_event *event) @@ -155,6 +158,7 @@ static int fanotify_merge(struct fsnotify_group *group, struct fanotify_event *old, *new = FANOTIFY_E(event); unsigned int bucket = fanotify_event_hash_bucket(group, new); struct hlist_head *hlist = &group->fanotify_data.merge_hash[bucket]; + int i = 0; pr_debug("%s: group=%p event=%p bucket=%u\n", __func__, group, event, bucket); @@ -168,6 +172,8 @@ static int fanotify_merge(struct fsnotify_group *group, return 0; hlist_for_each_entry(old, hlist, merge_list) { + if (++i > FANOTIFY_MAX_MERGE_EVENTS) + break; if (fanotify_should_merge(old, new)) { old->mask |= new->mask; return 1; |