vfs: d_invalidate() should leave mountpoints alone

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/fs/dcache.c b/fs/dcache.c
index 274f13e..a901c69 100644 (file)
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -546,9 +546,11 @@ int d_invalidate(struct dentry * dentry)
         * would make it unreachable from the root,
         * we might still populate it if it was a
         * working directory or similar).
+        * We also need to leave mountpoints alone,
+        * directory or not.
         */
-       if (dentry->d_count > 1) {
-               if (dentry->d_inode && S_ISDIR(dentry->d_inode->i_mode)) {
+       if (dentry->d_count > 1 && dentry->d_inode) {
+               if (S_ISDIR(dentry->d_inode->i_mode) || d_mountpoint(dentry)) {
                        spin_unlock(&dentry->d_lock);
                        return -EBUSY;
                }