diff options
| author | Jan Kara <jack@suse.cz> | 2016-11-10 16:02:11 +0100 |
|---|---|---|
| committer | Jan Kara <jack@suse.cz> | 2017-04-10 17:37:36 +0200 |
| commit | abc77577a669f424c5d0c185b9994f2621c52aa4 (patch) | |
| tree | a7e18bc2c8229a8a634d899445c33958f8967876 /fs/notify/group.c | |
| parent | fsnotify: Remove special handling of mark destruction on group shutdown (diff) | |
| download | linux-abc77577a669f424c5d0c185b9994f2621c52aa4.tar.xz linux-abc77577a669f424c5d0c185b9994f2621c52aa4.zip | |
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 <mszeredi@redhat.com>
Reviewed-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Diffstat (limited to 'fs/notify/group.c')
| -rw-r--r-- | fs/notify/group.c | 1 |
1 files changed, 1 insertions, 0 deletions
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); |