NFSD: pass an integer for stable type to nfsd_vfs_write

After fae5096ad217 "nfsd: assume writeable exportabled filesystems have
f_sync" we no longer modify this argument.

This is just cleanup, no change in functionality.

Signed-off-by: Kinglong Mee <kinglongmee@gmail.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

fs/nfsd/nfs3proc.c

@@ -197,7 +197,7 @@ nfsd3_proc_write(struct svc_rqst *rqstp, struct nfsd3_writeargs *argp,
 				   argp->offset,
 				   rqstp->rq_vec, argp->vlen,
 				   &cnt,
-				   &resp->committed);
+				   resp->committed);
 	resp->count = cnt;
 	RETURN_STATUS(nfserr);
 }

fs/nfsd/nfs4proc.c

@@ -983,7 +983,7 @@ nfsd4_write(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 
 	status = nfsd_vfs_write(rqstp, &cstate->current_fh, filp,
 				write->wr_offset, rqstp->rq_vec, nvecs, &cnt,
-				&write->wr_how_written);
+				write->wr_how_written);
 	fput(filp);
 
 	write->wr_bytes_written = cnt;

fs/nfsd/nfs4xdr.c

@@ -1250,7 +1250,7 @@ nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
 	READ_BUF(16);
 	p = xdr_decode_hyper(p, &write->wr_offset);
 	write->wr_stable_how = be32_to_cpup(p++);
-	if (write->wr_stable_how > 2)
+	if (write->wr_stable_how > NFS_FILE_SYNC)
 		goto xdr_error;
 	write->wr_buflen = be32_to_cpup(p++);
 

fs/nfsd/nfsproc.c

@@ -204,7 +204,6 @@ nfsd_proc_write(struct svc_rqst *rqstp, struct nfsd_writeargs *argp,
 					struct nfsd_attrstat  *resp)
 {
 	__be32	nfserr;
-	int	stable = 1;
 	unsigned long cnt = argp->len;
 
 	dprintk("nfsd: WRITE    %s %d bytes at %d\n",
@@ -215,7 +214,7 @@ nfsd_proc_write(struct svc_rqst *rqstp, struct nfsd_writeargs *argp,
 				   argp->offset,
 				   rqstp->rq_vec, argp->vlen,
 			           &cnt,
-				   &stable);
+				   NFS_DATA_SYNC);
 	return nfsd_return_attrs(nfserr, resp);
 }
 

fs/nfsd/vfs.c

@@ -917,14 +917,13 @@ static int wait_for_concurrent_writes(struct file *file)
 __be32
 nfsd_vfs_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file,
 				loff_t offset, struct kvec *vec, int vlen,
-				unsigned long *cnt, int *stablep)
+				unsigned long *cnt, int stable)
 {
 	struct svc_export	*exp;
 	struct inode		*inode;
 	mm_segment_t		oldfs;
 	__be32			err = 0;
 	int			host_err;
-	int			stable = *stablep;
 	int			use_wgather;
 	loff_t			pos = offset;
 	unsigned int		pflags = current->flags;
@@ -945,7 +944,7 @@ nfsd_vfs_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file,
 	use_wgather = (rqstp->rq_vers == 2) && EX_WGATHER(exp);
 
 	if (!EX_ISSYNC(exp))
-		stable = 0;
+		stable = NFS_UNSTABLE;
 
 	if (stable && !use_wgather)
 		flags |= RWF_SYNC;
@@ -1014,7 +1013,7 @@ __be32 nfsd_read(struct svc_rqst *rqstp, struct svc_fh *fhp,
 __be32
 nfsd_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file,
 		loff_t offset, struct kvec *vec, int vlen, unsigned long *cnt,
-		int *stablep)
+		int stable)
 {
 	__be32			err = 0;
 
@@ -1027,7 +1026,7 @@ nfsd_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file,
 			goto out;
 		trace_write_opened(rqstp, fhp, offset, vlen);
 		err = nfsd_vfs_write(rqstp, fhp, file, offset, vec, vlen, cnt,
-				stablep);
+				stable);
 		trace_write_io_done(rqstp, fhp, offset, vlen);
 	} else {
 		err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_WRITE, &file);
@@ -1037,7 +1036,7 @@ nfsd_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file,
 		trace_write_opened(rqstp, fhp, offset, vlen);
 		if (cnt)
 			err = nfsd_vfs_write(rqstp, fhp, file, offset, vec, vlen,
-					     cnt, stablep);
+					     cnt, stable);
 		trace_write_io_done(rqstp, fhp, offset, vlen);
 		fput(file);
 	}

fs/nfsd/vfs.h

@@ -84,11 +84,11 @@ __be32		nfsd_readv(struct file *, loff_t, struct kvec *, int,
 __be32 		nfsd_read(struct svc_rqst *, struct svc_fh *,
 				loff_t, struct kvec *, int, unsigned long *);
 __be32 		nfsd_write(struct svc_rqst *, struct svc_fh *,struct file *,
-				loff_t, struct kvec *,int, unsigned long *, int *);
+				loff_t, struct kvec *,int, unsigned long *, int);
 __be32		nfsd_vfs_write(struct svc_rqst *rqstp, struct svc_fh *fhp,
 				struct file *file, loff_t offset,
 				struct kvec *vec, int vlen, unsigned long *cnt,
-				int *stablep);
+				int stable);
 __be32		nfsd_readlink(struct svc_rqst *, struct svc_fh *,
 				char *, int *);
 __be32		nfsd_symlink(struct svc_rqst *, struct svc_fh *,