nfscl: Add support for a NFSv4 AppendWrite RPC

For IO_APPEND VOP_WRITE()s, the code first does a
Getattr RPC to acquire the file's size, before it
can do the Write RPC.

Although NFS does not have an append write operation,
an NFSv4 compound can use a Verify operation to check
that the client's notion of the file's size is
correct before doing the Write operation.

This patch prepares the NFSv4 client for such an
RPC, which will be added in a future commit.

This patch does not cause any semantics change.

4 files changed, 18 insertions, 8 deletions

diff --git a/sys/fs/nfs/nfs_commonport.c b/sys/fs/nfs/nfs_commonport.c
index 4719e7abf8cf..cb47922a34e0 100644
--- a/sys/fs/nfs/nfs_commonport.c
+++ b/sys/fs/nfs/nfs_commonport.c
@@ -598,7 +598,7 @@ nfssvc_call(struct thread *p, struct nfssvc_args *uap, struct ucred *cred)
 					    nfsstatsv1.biocache_readdirs;
 					nfsstatsov1.readdir_bios =
 					    nfsstatsv1.readdir_bios;
-					for (i = 0; i < NFSV42_NPROCS; i++)
+					for (i = 0; i < NFSV42_OLDNPROCS; i++)
 						nfsstatsov1.rpccnt[i] =
 						    nfsstatsv1.rpccnt[i];
 					nfsstatsov1.rpcretries =
diff --git a/sys/fs/nfs/nfs_commonsubs.c b/sys/fs/nfs/nfs_commonsubs.c
index 4be1c415bf67..d3c329a3abc7 100644
--- a/sys/fs/nfs/nfs_commonsubs.c
+++ b/sys/fs/nfs/nfs_commonsubs.c
@@ -150,7 +150,7 @@ struct nfsv4_opflag nfsv4_opflag[NFSV42_NOPS] = {
 	{ 0, 2, 1, 1, LK_EXCLUSIVE, 1, 0 },		/* Setattr */
 	{ 0, 0, 0, 0, LK_EXCLUSIVE, 1, 1 },		/* SetClientID */
 	{ 0, 0, 0, 0, LK_EXCLUSIVE, 1, 1 },		/* SetClientIDConfirm */
-	{ 0, 1, 0, 0, LK_EXCLUSIVE, 1, 1 },		/* Verify */
+	{ 0, 2, 0, 0, LK_EXCLUSIVE, 1, 0 },		/* Verify (AppWrite) */
 	{ 0, 2, 1, 1, LK_EXCLUSIVE, 1, 0 },		/* Write */
 	{ 0, 0, 0, 0, LK_EXCLUSIVE, 1, 0 },		/* ReleaseLockOwner */
 	{ 0, 0, 0, 0, LK_EXCLUSIVE, 1, 1 },		/* Backchannel Ctrl */
@@ -215,7 +215,7 @@ static struct nfsrv_lughash	*nfsgroupnamehash;
 static int nfs_bigreply[NFSV42_NPROCS] = { 0, 0, 0, 1, 0, 1, 1, 0, 0, 0, 0,
     0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
     0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0,
-    1, 0, 0, 1, 0, 0, 0, 0 };
+    1, 0, 0, 1, 0, 0, 0, 0, 0 };
 
 /* local functions */
 static int nfsrv_skipace(struct nfsrv_descript *nd, int *acesizep);
@@ -303,6 +303,7 @@ static struct {
 	{ NFSV4OP_LOOKUP, 5, "LookupOpen", 10, },
 	{ NFSV4OP_DEALLOCATE, 2, "Deallocate", 10, },
 	{ NFSV4OP_LAYOUTERROR, 1, "LayoutError", 11, },
+	{ NFSV4OP_VERIFY, 3, "AppendWrite", 11, },
 };
 
 /*
@@ -312,7 +313,7 @@ static int nfs_bigrequest[NFSV42_NPROCS] = {
 	0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
 	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
 	0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0,
-	0
+	0, 1
 };
 
 /*
diff --git a/sys/fs/nfs/nfsport.h b/sys/fs/nfs/nfsport.h
index 8ac4bc54a5f2..2955ae43de85 100644
--- a/sys/fs/nfs/nfsport.h
+++ b/sys/fs/nfs/nfsport.h
@@ -424,10 +424,16 @@
 /* Do an NFSv4.2 LayoutError. */
 #define	NFSPROC_LAYOUTERROR	68
 
+/* Do an NFSv4 Verify+Write. */
+#define	NFSPROC_APPENDWRITE	69
+
 /*
  * Must be defined as one higher than the last NFSv4.2 Proc# above.
  */
-#define	NFSV42_NPROCS		69
+#define	NFSV42_NPROCS		70
+
+/* Value of NFSV42_NPROCS for old nfsstats structure. (Always 69) */
+#define	NFSV42_OLDNPROCS	69
 
 #endif	/* NFS_V3NPROCS */
 
@@ -456,7 +462,7 @@ struct nfsstatsv1 {
 	uint64_t	readlink_bios;
 	uint64_t	biocache_readdirs;
 	uint64_t	readdir_bios;
-	uint64_t	rpccnt[NFSV42_NPROCS + 11];
+	uint64_t	rpccnt[NFSV42_NPROCS + 10];
 	uint64_t	rpcretries;
 	uint64_t	srvrpccnt[NFSV42_NOPS + NFSV4OP_FAKENOPS + 15];
 	uint64_t	srvlayouts;
@@ -521,7 +527,7 @@ struct nfsstatsov1 {
 	uint64_t	readlink_bios;
 	uint64_t	biocache_readdirs;
 	uint64_t	readdir_bios;
-	uint64_t	rpccnt[NFSV42_NPROCS];
+	uint64_t	rpccnt[NFSV42_OLDNPROCS];
 	uint64_t	rpcretries;
 	uint64_t	srvrpccnt[NFSV42_PURENOPS + NFSV4OP_FAKENOPS];
 	uint64_t	reserved_0;
diff --git a/sys/fs/nfs/nfsproto.h b/sys/fs/nfs/nfsproto.h
index 968cc6a41cc3..2e21a70b5d86 100644
--- a/sys/fs/nfs/nfsproto.h
+++ b/sys/fs/nfs/nfsproto.h
@@ -405,10 +405,13 @@
 /* Do an NFSv4.2 LayoutError. */
 #define	NFSPROC_LAYOUTERROR	68
 
+/* Do an NFSv4 Verify+Write. */
+#define	NFSPROC_APPENDWRITE	69
+
 /*
  * Must be defined as one higher than the last NFSv4.2 Proc# above.
  */
-#define	NFSV42_NPROCS		69
+#define	NFSV42_NPROCS		70
 
 #endif	/* NFS_V3NPROCS */