nfsd: Allow nfsd_vfs_write() to take the nfsd_file as an argument

Needed in order to fix stable writes.
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

fs/nfsd/nfs4proc.c

@@ -1021,7 +1021,7 @@ nfsd4_write(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 				      &write->wr_head, write->wr_buflen);
 	WARN_ON_ONCE(nvecs > ARRAY_SIZE(rqstp->rq_vec));
 
-	status = nfsd_vfs_write(rqstp, &cstate->current_fh, nf->nf_file,
+	status = nfsd_vfs_write(rqstp, &cstate->current_fh, nf,
 				write->wr_offset, rqstp->rq_vec, nvecs, &cnt,
 				write->wr_how_written);
 	nfsd_file_put(nf);

fs/nfsd/vfs.c

@@ -947,10 +947,11 @@ static int wait_for_concurrent_writes(struct file *file)
 }
 
 __be32
-nfsd_vfs_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file *file,
+nfsd_vfs_write(struct svc_rqst *rqstp, struct svc_fh *fhp, struct nfsd_file *nf,
 				loff_t offset, struct kvec *vec, int vlen,
 				unsigned long *cnt, int stable)
 {
+	struct file		*file = nf->nf_file;
 	struct svc_export	*exp;
 	struct iov_iter		iter;
 	__be32			nfserr;
@@ -1057,7 +1058,7 @@ nfsd_write(struct svc_rqst *rqstp, struct svc_fh *fhp, loff_t offset,
 	if (err)
 		goto out;
 
-	err = nfsd_vfs_write(rqstp, fhp, nf->nf_file, offset, vec,
+	err = nfsd_vfs_write(rqstp, fhp, nf, offset, vec,
 			vlen, cnt, stable);
 	nfsd_file_put(nf);
 out:

fs/nfsd/vfs.h

@@ -34,6 +34,8 @@
 #define NFSD_MAY_CREATE		(NFSD_MAY_EXEC|NFSD_MAY_WRITE)
 #define NFSD_MAY_REMOVE		(NFSD_MAY_EXEC|NFSD_MAY_WRITE|NFSD_MAY_TRUNC)
 
+struct nfsd_file;
+
 /*
  * Callback function for readdir
  */
@@ -93,7 +95,7 @@ __be32 		nfsd_read(struct svc_rqst *, struct svc_fh *,
 __be32 		nfsd_write(struct svc_rqst *, struct svc_fh *, 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 nfsd_file *nf, loff_t offset,
 				struct kvec *vec, int vlen, unsigned long *cnt,
 				int stable);
 __be32		nfsd_readlink(struct svc_rqst *, struct svc_fh *,