[RFC v1 17/18] NFSD support OFFLOAD_STATUS

[Olga Kornievskaia <kolga@xxxxxxxxxx>]

Update number of bytes copied in the copy state and query that
value under lock if OFFLOAD_STATUS operation received.

Signed-off-by: Olga Kornievskaia <kolga@xxxxxxxxxx>
---
 fs/nfsd/nfs4proc.c | 14 +++++++++++++-
 fs/nfsd/state.h    |  1 +
 2 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index f07eae1..8a1860e 100644
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -1390,6 +1390,7 @@ static int _nfsd_copy_file_range(struct nfsd4_copy *copy)
 		dst_pos += bytes_copied;
 		spin_lock(&copy->cps->cp_lock);
 		cancelled = copy->cps->cp_cancelled;
+		copy->cps->cp_bytes_copied = copy->cp_res.wr_bytes_written;
 		spin_unlock(&copy->cps->cp_lock);
 	} while (bytes_total > 0 && !cancelled);
 	return bytes_copied;
@@ -1630,7 +1631,18 @@ static void nfsd4_do_async_copy(struct work_struct *work)
 		     struct nfsd4_compound_state *cstate,
 		     struct nfsd4_offload_status *os)
 {
-	return nfserr_notsupp;
+	struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
+	__be32 status;
+	struct nfs4_cp_state *state = NULL;
+
+	status = find_cp_state(nn, &os->stateid, &state);
+
+	if (state) {
+		spin_lock(&state->cp_lock);
+		os->count = state->cp_bytes_copied;
+		spin_unlock(&state->cp_lock);
+	}
+	return status;
 }
 
 static __be32
diff --git a/fs/nfsd/state.h b/fs/nfsd/state.h
index 70ee3fe..25c5d82 100644
--- a/fs/nfsd/state.h
+++ b/fs/nfsd/state.h
@@ -117,6 +117,7 @@ struct nfs4_cp_state {
 	bool			cp_dst_async;	/* async copy on dst server */
 	bool			cp_cancelled;	/* copy cancelled */
 	spinlock_t		cp_lock;
+	ssize_t			cp_bytes_copied;/* copy progress */
 };
 
 /*
-- 
1.8.3.1

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