inotify: do not BUG on idr entries at inotify destruction

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>

diff --git a/fs/notify/inotify/inotify_fsnotify.c b/fs/notify/inotify/inotify_fsnotify.c
index 5dcbafe..c9ee67b 100644 (file)
--- a/fs/notify/inotify/inotify_fsnotify.c
+++ b/fs/notify/inotify/inotify_fsnotify.c
@@ -105,16 +105,45 @@ static bool inotify_should_send_event(struct fsnotify_group *group, struct inode
        return send;
 }
 
+/*
+ * This is NEVER supposed to be called.  Inotify marks should either have been
+ * removed from the idr when the watch was removed or in the
+ * fsnotify_destroy_mark_by_group() call when the inotify instance was being
+ * torn down.  This is only called if the idr is about to be freed but there
+ * are still marks in it.
+ */
 static int idr_callback(int id, void *p, void *data)
 {
-       BUG();
+       struct fsnotify_mark_entry *entry;
+       struct inotify_inode_mark_entry *ientry;
+       static bool warned = false;
+
+       if (warned)
+               return 0;
+
+       warned = false;
+       entry = p;
+       ientry = container_of(entry, struct inotify_inode_mark_entry, fsn_entry);
+
+       WARN(1, "inotify closing but id=%d for entry=%p in group=%p still in "
+               "idr.  Probably leaking memory\n", id, p, data);
+
+       /*
+        * I'm taking the liberty of assuming that the mark in question is a
+        * valid address and I'm dereferencing it.  This might help to figure
+        * out why we got here and the panic is no worse than the original
+        * BUG() that was here.
+        */
+       if (entry)
+               printk(KERN_WARNING "entry->group=%p inode=%p wd=%d\n",
+                       entry->group, entry->inode, ientry->wd);
        return 0;
 }
 
 static void inotify_free_group_priv(struct fsnotify_group *group)
 {
        /* ideally the idr is empty and we won't hit the BUG in teh callback */
-       idr_for_each(&group->inotify_data.idr, idr_callback, NULL);
+       idr_for_each(&group->inotify_data.idr, idr_callback, group);
        idr_remove_all(&group->inotify_data.idr);
        idr_destroy(&group->inotify_data.idr);
 }