[PATCH 2/3] inotify: do not BUG on idr entries at inotify destruction

[Eric Paris <eparis@redhat.com>]

If an inotify watch is left in the idr when an fsnotify group is destroyed
this will lead to a BUG.  This is not a dangerous situation and really
indicates a programming bug and leak of memory.  This patch changes it to
use a WARN and a printk rather than killing people's boxes.

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

 fs/notify/inotify/inotify_fsnotify.c |   10 ++++++++++
 1 files changed, 10 insertions(+), 0 deletions(-)

diff --git a/fs/notify/inotify/inotify_fsnotify.c b/fs/notify/inotify/inotify_fsnotify.c
index 5dcbafe..cf003fc 100644
--- a/fs/notify/inotify/inotify_fsnotify.c
+++ b/fs/notify/inotify/inotify_fsnotify.c
@@ -107,6 +107,16 @@ static bool inotify_should_send_event(struct fsnotify_group *group, struct inode
 
 static int idr_callback(int id, void *p, void *data)
 {
+	struct fsnotify_mark_entry *entry;
+	struct inotify_inode_mark_entry *ientry;
+
+	entry = p;
+	ientry = container_of(entry, struct inotify_inode_mark_entry, fsn_entry);
+
+	WARN(1, "inotify closing but id=%d still in idr.  Probably leaking memory\n", id);
+
+	printk(KERN_WARNING "group=%p entry->group=%p inode=%p wd=%d\n",
+	       data, entry->group, entry->inode, ientry->wd);
 	BUG();
 	return 0;
 }