[PATCH v4 11/14] NFSD: Remove NFSD_BUFSIZE

[cel@kernel.org]

From: Chuck Lever <chuck.lever@oracle.com>

Clean up: The documenting comment for NFSD_BUFSIZE is quite stale.
NFSD_BUFSIZE is used only for NFSv4 Reply these days; never for
NFSv2 or v3, and never for RPC Calls. Even so, the byte count
estimate does not include the size of the NFSv4 COMPOUND Reply
HEADER or the RPC auth flavor.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
---
 fs/nfsd/nfs4proc.c  |  2 +-
 fs/nfsd/nfs4state.c |  2 +-
 fs/nfsd/nfs4xdr.c   |  2 +-
 fs/nfsd/nfsd.h      | 13 -------------
 4 files changed, 3 insertions(+), 16 deletions(-)

diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index b397246dae7b..59451b405b5c 100644
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -3832,7 +3832,7 @@ static const struct svc_procedure nfsd_procedures4[2] = {
 		.pc_ressize = sizeof(struct nfsd4_compoundres),
 		.pc_release = nfsd4_release_compoundargs,
 		.pc_cachetype = RC_NOCACHE,
-		.pc_xdrressize = NFSD_BUFSIZE/4,
+		.pc_xdrressize = 3+NFSSVC_MAXBLKSIZE/4,
 		.pc_name = "COMPOUND",
 	},
 };
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 59a693f22452..8adcee9dc4d3 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -4402,7 +4402,7 @@ nfsd4_sequence(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 				    nfserr_rep_too_big;
 	if (xdr_restrict_buflen(xdr, buflen - rqstp->rq_auth_slack))
 		goto out_put_session;
-	svc_reserve(rqstp, buflen);
+	svc_reserve_auth(rqstp, buflen);
 
 	status = nfs_ok;
 	/* Success! accept new slot seqid */
diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index 44e7fb34f433..ac1bc2431f27 100644
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -2564,7 +2564,7 @@ nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
 	/* Sessions make the DRC unnecessary: */
 	if (argp->minorversion)
 		cachethis = false;
-	svc_reserve(argp->rqstp, max_reply + readbytes);
+	svc_reserve_auth(argp->rqstp, max_reply + readbytes);
 	argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
 
 	argp->splice_ok = nfsd_read_splice_ok(argp->rqstp);
diff --git a/fs/nfsd/nfsd.h b/fs/nfsd/nfsd.h
index e2997f0ffbc5..91d144655351 100644
--- a/fs/nfsd/nfsd.h
+++ b/fs/nfsd/nfsd.h
@@ -50,19 +50,6 @@ bool nfsd_support_version(int vers);
 /* NFSv2 is limited by the protocol specification, see RFC 1094 */
 #define NFSSVC_MAXBLKSIZE_V2    (8*1024)
 
-
-/*
- * Largest number of bytes we need to allocate for an NFS
- * call or reply.  Used to control buffer sizes.  We use
- * the length of v3 WRITE, READDIR and READDIR replies
- * which are an RPC header, up to 26 XDR units of reply
- * data, and some page data.
- *
- * Note that accuracy here doesn't matter too much as the
- * size is rounded up to a page size when allocating space.
- */
-#define NFSD_BUFSIZE            ((RPC_MAX_HEADER_WITH_AUTH+26)*XDR_UNIT + NFSSVC_MAXBLKSIZE)
-
 struct readdir_cd {
 	__be32			err;	/* 0, nfserr, or nfserr_eof */
 };
-- 
2.49.0