[PATCH v3 8/8] NFSD: Send CB_OFFLOAD on graceful shutdown

[cel@kernel.org]

From: Chuck Lever <chuck.lever@oracle.com>

If an async COPY operation happens to be running when the server is
shut down, notify the requesting client that the copy has completed.

Since the nfs4_client is going away, seems like this could introduce
some UAFs.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
---
 fs/nfsd/nfs4proc.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index 4c964bce6bd7..51b3f85f3791 100644
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -68,6 +68,8 @@ MODULE_PARM_DESC(nfsd4_ssc_umount_timeout,
 
 #define NFSDDBG_FACILITY		NFSDDBG_PROC
 
+static void nfsd4_send_cb_offload(struct nfsd4_copy *copy);
+
 static u32 nfsd_attrmask[] = {
 	NFSD_WRITEABLE_ATTRS_WORD0,
 	NFSD_WRITEABLE_ATTRS_WORD1,
@@ -1381,8 +1383,10 @@ void nfsd4_shutdown_copy(struct nfs4_client *clp)
 {
 	struct nfsd4_copy *copy;
 
-	while ((copy = nfsd4_get_copy(clp)) != NULL)
+	while ((copy = nfsd4_get_copy(clp)) != NULL) {
 		nfsd4_stop_copy(copy);
+		nfsd4_send_cb_offload(copy);
+	}
 }
 #ifdef CONFIG_NFSD_V4_2_INTER_SSC
 
-- 
2.47.0