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Subject: [PATCH v1 35/52] NFSD: Add nfsd4_encode_fattr4_space_free()
From:   Chuck Lever <cel@kernel.org>
To:     linux-nfs@vger.kernel.org
Cc:     Chuck Lever <chuck.lever@oracle.com>
Date:   Mon, 18 Sep 2023 10:00:30 -0400
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From: Chuck Lever <chuck.lever@oracle.com>

Refactor the encoder for FATTR4_SPACE_FREE into a helper. In a
subsequent patch, this helper will be called from a bitmask loop.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
---
 fs/nfsd/nfs4xdr.c |   16 +++++++++++-----
 1 file changed, 11 insertions(+), 5 deletions(-)

diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index 42ce95b8db43..a9f99f07c904 100644
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -3232,6 +3232,14 @@ static __be32 nfsd4_encode_fattr4_space_avail(struct xdr_stream *xdr,
 	return nfsd4_encode_uint64_t(xdr, avail);
 }
 
+static __be32 nfsd4_encode_fattr4_space_free(struct xdr_stream *xdr,
+					     const struct nfsd4_fattr_args *args)
+{
+	u64 free = (u64)args->statfs.f_bfree * (u64)args->statfs.f_bsize;
+
+	return nfsd4_encode_uint64_t(xdr, free);
+}
+
 /*
  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
  * ourselves.
@@ -3541,11 +3549,9 @@ nfsd4_encode_fattr(struct xdr_stream *xdr, struct svc_fh *fhp,
 			goto out;
 	}
 	if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
-		p = xdr_reserve_space(xdr, 8);
-		if (!p)
-			goto out_resource;
-		dummy64 = (u64)args.statfs.f_bfree * (u64)args.statfs.f_bsize;
-		p = xdr_encode_hyper(p, dummy64);
+		status = nfsd4_encode_fattr4_space_free(xdr, &args);
+		if (status != nfs_ok)
+			goto out;
 	}
 	if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
 		p = xdr_reserve_space(xdr, 8);