From: Trond Myklebust <trond.myklebust@hammerspace.com>
Date: Mon, 21 Oct 2019 18:11:00 +0000 (-0400)
Subject: NFSv4: Hold the delegation spinlock when updating the seqid
X-Git-Tag: v5.10.7~3675^2~31
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=e0f07896affd27ec378857dd6fccad0a43e52d35;p=platform%2Fkernel%2Flinux-rpi.git

NFSv4: Hold the delegation spinlock when updating the seqid

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
---

diff --git a/fs/nfs/delegation.c b/fs/nfs/delegation.c
index e80419a6..7ebeb57 100644
--- a/fs/nfs/delegation.c
+++ b/fs/nfs/delegation.c
@@ -387,8 +387,10 @@ int nfs_inode_set_delegation(struct inode *inode, const struct cred *cred,
 		/* Is this an update of the existing delegation? */
 		if (nfs4_stateid_match_other(&old_delegation->stateid,
 					&delegation->stateid)) {
+			spin_lock(&old_delegation->lock);
 			nfs_update_inplace_delegation(old_delegation,
 					delegation);
+			spin_unlock(&old_delegation->lock);
 			goto out;
 		}
 		/*