commit 566f8737630390b743d79e26e4ac855fe2758129
author Peng Tao <tao.peng@primarydata.com> Fri Oct 10 23:25:46 2014 +0800
committer Tom Haynes <loghyr@primarydata.com> Tue Feb 03 11:06:47 2015 -0800
tree 974b19ea87f8185b4442657a51a0ce27fc70998c
parent 80c76fe314c2859d5aac94b5d66d2b9895aa73d4

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>

fs/nfs/pnfs.c

diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c
index 5f7c422..e123cfc 100644
--- a/fs/nfs/pnfs.c
+++ b/fs/nfs/pnfs.c
@@ -242,6 +242,8 @@
 	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);