[RFC PATCH v2 13/15] nfs/nfsd: consolidate {encode,decode}_opaque_fixed in nfs_xdr.h

[Mike Snitzer <snitzer@kernel.org>]

Eliminates duplicate functions in various files.

Signed-off-by: Mike Snitzer <snitzer@kernel.org>
---
 fs/nfs/flexfilelayout/flexfilelayout.c |  6 ------
 fs/nfs/nfs3xdr.c                       |  9 ---------
 fs/nfs/nfs4xdr.c                       | 13 -------------
 fs/nfsd/localio.c                      |  7 ++-----
 include/linux/nfs_xdr.h                | 20 +++++++++++++++++++-
 5 files changed, 21 insertions(+), 34 deletions(-)

diff --git a/fs/nfs/flexfilelayout/flexfilelayout.c b/fs/nfs/flexfilelayout/flexfilelayout.c
index ec6aaa110a7b..8b9096ad0663 100644
--- a/fs/nfs/flexfilelayout/flexfilelayout.c
+++ b/fs/nfs/flexfilelayout/flexfilelayout.c
@@ -2185,12 +2185,6 @@ static int ff_layout_encode_ioerr(struct xdr_stream *xdr,
 	return ff_layout_encode_ds_ioerr(xdr, &ff_args->errors);
 }
 
-static void
-encode_opaque_fixed(struct xdr_stream *xdr, const void *buf, size_t len)
-{
-	WARN_ON_ONCE(xdr_stream_encode_opaque_fixed(xdr, buf, len) < 0);
-}
-
 static void
 ff_layout_encode_ff_iostat_head(struct xdr_stream *xdr,
 			    const nfs4_stateid *stateid,
diff --git a/fs/nfs/nfs3xdr.c b/fs/nfs/nfs3xdr.c
index d2a17ecd12b8..95a2fb0733ae 100644
--- a/fs/nfs/nfs3xdr.c
+++ b/fs/nfs/nfs3xdr.c
@@ -2591,15 +2591,6 @@ static void nfs3_xdr_enc_getuuidargs(struct rpc_rqst *req,
 	/* void function */
 }
 
-// FIXME: factor out from fs/nfs/nfs4xdr.c
-static int decode_opaque_fixed(struct xdr_stream *xdr, void *buf, size_t len)
-{
-	ssize_t ret = xdr_stream_decode_opaque_fixed(xdr, buf, len);
-	if (unlikely(ret < 0))
-		return -EIO;
-	return 0;
-}
-
 static inline int nfs3_decode_getuuidresok(struct xdr_stream *xdr,
 					struct nfs_getuuidres *result)
 {
diff --git a/fs/nfs/nfs4xdr.c b/fs/nfs/nfs4xdr.c
index d3b4fa3245f0..6b35b1d7d7ce 100644
--- a/fs/nfs/nfs4xdr.c
+++ b/fs/nfs/nfs4xdr.c
@@ -968,11 +968,6 @@ static __be32 *reserve_space(struct xdr_stream *xdr, size_t nbytes)
 	return p;
 }
 
-static void encode_opaque_fixed(struct xdr_stream *xdr, const void *buf, size_t len)
-{
-	WARN_ON_ONCE(xdr_stream_encode_opaque_fixed(xdr, buf, len) < 0);
-}
-
 static void encode_string(struct xdr_stream *xdr, unsigned int len, const char *str)
 {
 	WARN_ON_ONCE(xdr_stream_encode_opaque(xdr, str, len) < 0);
@@ -4352,14 +4347,6 @@ static int decode_access(struct xdr_stream *xdr, u32 *supported, u32 *access)
 	return 0;
 }
 
-static int decode_opaque_fixed(struct xdr_stream *xdr, void *buf, size_t len)
-{
-	ssize_t ret = xdr_stream_decode_opaque_fixed(xdr, buf, len);
-	if (unlikely(ret < 0))
-		return -EIO;
-	return 0;
-}
-
 static int decode_stateid(struct xdr_stream *xdr, nfs4_stateid *stateid)
 {
 	return decode_opaque_fixed(xdr, stateid, NFS4_STATEID_SIZE);
diff --git a/fs/nfsd/localio.c b/fs/nfsd/localio.c
index e35480595ec9..866e8c8a5548 100644
--- a/fs/nfsd/localio.c
+++ b/fs/nfsd/localio.c
@@ -11,6 +11,8 @@
 #include <linux/sunrpc/svcauth_gss.h>
 #include <linux/sunrpc/clnt.h>
 #include <linux/nfs.h>
+#include <linux/nfs_fs.h>
+#include <linux/nfs_xdr.h>
 #include <linux/string.h>
 
 #include "nfsd.h"
@@ -208,11 +210,6 @@ static __be32 nfsd_proc_getuuid(struct svc_rqst *rqstp)
 
 #define NFS_getuuid_sz XDR_QUADLEN(UUID_SIZE)
 
-static inline void encode_opaque_fixed(struct xdr_stream *xdr, const void *buf, size_t len)
-{
-	WARN_ON_ONCE(xdr_stream_encode_opaque_fixed(xdr, buf, len) < 0);
-}
-
 static void encode_uuid(struct xdr_stream *xdr, uuid_t *src_uuid)
 {
 	u8 uuid[UUID_SIZE];
diff --git a/include/linux/nfs_xdr.h b/include/linux/nfs_xdr.h
index 2a438f4c2d6d..daa4115f6be6 100644
--- a/include/linux/nfs_xdr.h
+++ b/include/linux/nfs_xdr.h
@@ -1826,6 +1826,24 @@ struct nfs_rpc_ops {
 	void	(*init_localioclient)(struct nfs_client *);
 };
 
+/*
+ * Helper functions used by NFS client and/or server
+ */
+static inline void encode_opaque_fixed(struct xdr_stream *xdr,
+				       const void *buf, size_t len)
+{
+	WARN_ON_ONCE(xdr_stream_encode_opaque_fixed(xdr, buf, len) < 0);
+}
+
+static inline int decode_opaque_fixed(struct xdr_stream *xdr,
+				      void *buf, size_t len)
+{
+	ssize_t ret = xdr_stream_decode_opaque_fixed(xdr, buf, len);
+	if (unlikely(ret < 0))
+		return -EIO;
+	return 0;
+}
+
 /*
  * Function vectors etc. for the NFS client
  */
@@ -1844,4 +1862,4 @@ extern const struct rpc_program nfslocalio_program3;
 extern const struct rpc_version nfslocalio_version4;
 extern const struct rpc_program nfslocalio_program4;
 
-#endif
+#endif /* _LINUX_NFS_XDR_H */
-- 
2.44.0