[PATCH 6.12.y 1/2] nfsd: update mtime/ctime on COPY in presence of delegated attributes

[Sasha Levin <sashal@kernel.org>]

From: Olga Kornievskaia <okorniev@redhat.com>

[ Upstream commit 4183cf383b6faec17a0882b84cd2d901dba62b16 ]

When delegated attributes are given on open, the file is opened with
NOCMTIME and modifying operations do not update mtime/ctime as to not get
out-of-sync with the client's delegated view. However, for COPY operation,
the server should update its view of mtime/ctime and reflect that in any
GETATTR queries.

Fixes: e5e9b24ab8fa ("nfsd: freeze c/mtime updates with outstanding WRITE_ATTRS delegation")
Cc: stable@vger.kernel.org
Signed-off-by: Olga Kornievskaia <okorniev@redhat.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>

[ Stable adaptation: Linux 6.12 does not contain the Fixes commit or
nfsd_update_cmtime_attr(), so omit the timestamp-update call sites. Keep the
attr_update context needed by d0beaee498e1 ("nfsd: fix stale s2s_cp_stateids
IDR entry for async COPY"), and alias its newer error label to the existing
6.12 cleanup path. ]

Stable-dep-of: d0beaee498e1 ("nfsd: fix stale s2s_cp_stateids IDR entry for async COPY")
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 fs/nfsd/nfs4proc.c | 8 ++++++--
 fs/nfsd/xdr4.h     | 1 +
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index 2c7a8943cad9c..ee67978996293 100644
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -1853,12 +1853,15 @@ nfsd4_copy(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 			goto out_err;
 		async_copy->cp_src = kmalloc(sizeof(*async_copy->cp_src), GFP_KERNEL);
 		if (!async_copy->cp_src)
-			goto out_err;
+			goto out_dec_async_copy_err;
 		if (!nfs4_init_copy_state(nn, copy))
-			goto out_err;
+			goto out_dec_async_copy_err;
 		memcpy(&result->cb_stateid, &copy->cp_stateid.cs_stid,
 			sizeof(result->cb_stateid));
 		dup_copy_fields(copy, async_copy);
+		if ((READ_ONCE(copy->nf_dst->nf_file->f_mode) &
+			       FMODE_NOCMTIME) != 0)
+			async_copy->attr_update = true;
 		async_copy->copy_task = kthread_create(nfsd4_do_async_copy,
 				async_copy, "%s", "copy thread");
 		if (IS_ERR(async_copy->copy_task))
@@ -1877,6 +1880,7 @@ nfsd4_copy(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 	trace_nfsd_copy_done(copy, status);
 	release_copy_files(copy);
 	return status;
+out_dec_async_copy_err:
 out_err:
 	if (nfsd4_ssc_is_inter(copy)) {
 		/*
diff --git a/fs/nfsd/xdr4.h b/fs/nfsd/xdr4.h
index c75b295df206a..1f62c3755988c 100644
--- a/fs/nfsd/xdr4.h
+++ b/fs/nfsd/xdr4.h
@@ -736,6 +736,7 @@ struct nfsd4_copy {
 
 	struct nfsd_file        *nf_src;
 	struct nfsd_file        *nf_dst;
+	bool			attr_update;
 
 	copy_stateid_t		cp_stateid;
 
-- 
2.53.0