From abc77577a669f424c5d0c185b9994f2621c52aa4 Mon Sep 17 00:00:00 2001 From: Jan Kara Date: Thu, 10 Nov 2016 16:02:11 +0100 Subject: fsnotify: Provide framework for dropping SRCU lock in ->handle_event fanotify wants to drop fsnotify_mark_srcu lock when waiting for response from userspace so that the whole notification subsystem is not blocked during that time. This patch provides a framework for safely getting mark reference for a mark found in the object list which pins the mark in that list. We can then drop fsnotify_mark_srcu, wait for userspace response and then safely continue iteration of the object list once we reaquire fsnotify_mark_srcu. Reviewed-by: Miklos Szeredi Reviewed-by: Amir Goldstein Signed-off-by: Jan Kara --- fs/notify/group.c | 1 + 1 file changed, 1 insertion(+) (limited to 'fs/notify/group.c') diff --git a/fs/notify/group.c b/fs/notify/group.c index 0fb4aadcc19f..79439cdf16e0 100644 --- a/fs/notify/group.c +++ b/fs/notify/group.c @@ -126,6 +126,7 @@ struct fsnotify_group *fsnotify_alloc_group(const struct fsnotify_ops *ops) /* set to 0 when there a no external references to this group */ atomic_set(&group->refcnt, 1); atomic_set(&group->num_marks, 0); + atomic_set(&group->user_waits, 0); spin_lock_init(&group->notification_lock); INIT_LIST_HEAD(&group->notification_list); -- cgit v1.2.3