fs/notify/inotify: decrement user inotify count on close

The per-user inotify_devs value is incremented each time a new file is
allocated, but never decremented. This led to inotify_init failing after a
limited number of calls.

Signed-off-by: Keith Packard <keithp@keithp.com>
Signed-off-by: Eric Paris <eparis@redhat.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/fs/notify/inotify/inotify_user.c b/fs/notify/inotify/inotify_user.c
index ff231ad23895..ff27a2965844 100644
--- a/fs/notify/inotify/inotify_user.c
+++ b/fs/notify/inotify/inotify_user.c
@@ -296,12 +296,15 @@ static int inotify_fasync(int fd, struct file *file, int on)
 static int inotify_release(struct inode *ignored, struct file *file)
 {
         struct fsnotify_group *group = file->private_data;
+        struct user_struct *user = group->inotify_data.user;
 
         fsnotify_clear_marks_by_group(group);
 
         /* free this group, matching get was inotify_init->fsnotify_obtain_group */
         fsnotify_put_group(group);
 
+        atomic_dec(&user->inotify_devs);
+
         return 0;
 }