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[v4,38/50] nfs41: add a debug warning if we destroy an unempty layout

Message ID 1421253896-73106-39-git-send-email-loghyr@primarydata.com (mailing list archive)
State New, archived
Headers show

Commit Message

Thomas Haynes Jan. 14, 2015, 4:44 p.m. UTC 
From: Peng Tao <tao.peng@primarydata.com>

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 | 2 ++
 1 file changed, 2 insertions(+)
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Patch

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 @@  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);