fsnotify: vfsmount marks generic functions

Much like inode-mark.c has all of the code dealing with marks on inodes
this patch adds a vfsmount-mark.c which has similar code but is intended
for marks on vfsmounts.

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

1 files changed, 11 insertions, 9 deletions

diff --git a/fs/notify/mark.c b/fs/notify/mark.c
index 57bb1d74a2b6..d296ec9ffb2a 100644
--- a/fs/notify/mark.c
+++ b/fs/notify/mark.c
@@ -115,15 +115,11 @@ void fsnotify_put_mark(struct fsnotify_mark *mark)
 void fsnotify_destroy_mark(struct fsnotify_mark *mark)
 {
         struct fsnotify_group *group;
-        struct inode *inode;
+        struct inode *inode = NULL;
 
         spin_lock(&mark->lock);
 
         group = mark->group;
-        inode = mark->i.inode;
-
-        BUG_ON(group && !inode);
-        BUG_ON(!group && inode);
 
         /* if !group something else already marked this to die */
         if (!group) {
@@ -136,8 +132,11 @@ void fsnotify_destroy_mark(struct fsnotify_mark *mark)
 
         spin_lock(&group->mark_lock);
 
-        if (mark->flags & FSNOTIFY_MARK_FLAG_INODE)
+        if (mark->flags & FSNOTIFY_MARK_FLAG_INODE) {
                 fsnotify_destroy_inode_mark(mark);
+                inode = mark->i.inode;
+        } else if (mark->flags & FSNOTIFY_MARK_FLAG_VFSMOUNT)
+                fsnotify_destroy_vfsmount_mark(mark);
         else
                 BUG();
 
@@ -169,8 +168,8 @@ void fsnotify_destroy_mark(struct fsnotify_mark *mark)
          * is just a lazy update (and could be a perf win...)
          */
 
-
-        iput(inode);
+        if (inode)
+                iput(inode);
 
         /*
          * it's possible that this group tried to destroy itself, but this
@@ -192,7 +191,6 @@ int fsnotify_add_mark(struct fsnotify_mark *mark,
 {
         int ret = 0;
 
-        BUG_ON(mnt);
         BUG_ON(inode && mnt);
         BUG_ON(!inode && !mnt);
 
@@ -223,6 +221,10 @@ int fsnotify_add_mark(struct fsnotify_mark *mark,
                 ret = fsnotify_add_inode_mark(mark, group, inode, allow_dups);
                 if (ret)
                         goto err;
+        } else if (mnt) {
+                ret = fsnotify_add_vfsmount_mark(mark, group, mnt, allow_dups);
+                if (ret)
+                        goto err;
         } else {
                 BUG();
         }