nfs41: add a debug warning if we destroy an unempty layout

So that we can detect the case if some layout segments are still
pinned which is surely a bug that we need to fix.

Signed-off-by: Peng Tao <tao.peng@primarydata.com>

diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c
index 5f7c422..e123cfc 100644 (file)
--- a/fs/nfs/pnfs.c
+++ b/fs/nfs/pnfs.c
@@ -242,6 +242,8 @@ pnfs_put_layout_hdr(struct pnfs_layout_hdr *lo)
        struct inode *inode = lo->plh_inode;
 
        if (atomic_dec_and_lock(&lo->plh_refcount, &inode->i_lock)) {
+               if (!list_empty(&lo->plh_segs))
+                       WARN_ONCE(1, "NFS: BUG unfreed layout segments.\n");
                pnfs_detach_layout_hdr(lo);
                spin_unlock(&inode->i_lock);
                pnfs_free_layout_hdr(lo);