NFSD bug fixes for 5.18-rc:

- Fix a write performance regression
 - Fix crashes during request deferral on RDMA transports
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Merge tag 'nfsd-5.18-1' of git://git.kernel.org/pub/scm/linux/kernel/git/cel/linux

Pull nfsd fixes from Chuck Lever:

 - Fix a write performance regression

 - Fix crashes during request deferral on RDMA transports

* tag 'nfsd-5.18-1' of git://git.kernel.org/pub/scm/linux/kernel/git/cel/linux:
  SUNRPC: Fix the svc_deferred_event trace class
  SUNRPC: Fix NFSD's request deferral on RDMA transports
  nfsd: Clean up nfsd_file_put()
  nfsd: Fix a write performance regression
  SUNRPC: Return true/false (not 1/0) from bool functions

fs/nfsd/filecache.c

@@ -236,6 +236,13 @@ nfsd_file_check_write_error(struct nfsd_file *nf)
 	return filemap_check_wb_err(file->f_mapping, READ_ONCE(file->f_wb_err));
 }
 
+static void
+nfsd_file_flush(struct nfsd_file *nf)
+{
+	if (nf->nf_file && vfs_fsync(nf->nf_file, 1) != 0)
+		nfsd_reset_write_verifier(net_generic(nf->nf_net, nfsd_net_id));
+}
+
 static void
 nfsd_file_do_unhash(struct nfsd_file *nf)
 {
@@ -295,19 +302,15 @@ nfsd_file_put_noref(struct nfsd_file *nf)
 void
 nfsd_file_put(struct nfsd_file *nf)
 {
-	bool is_hashed;
-
 	set_bit(NFSD_FILE_REFERENCED, &nf->nf_flags);
-	if (refcount_read(&nf->nf_ref) > 2 || !nf->nf_file) {
+	if (test_bit(NFSD_FILE_HASHED, &nf->nf_flags) == 0) {
+		nfsd_file_flush(nf);
 		nfsd_file_put_noref(nf);
-		return;
+	} else {
+		nfsd_file_put_noref(nf);
+		if (nf->nf_file)
+			nfsd_file_schedule_laundrette();
 	}
-
-	filemap_flush(nf->nf_file->f_mapping);
-	is_hashed = test_bit(NFSD_FILE_HASHED, &nf->nf_flags) != 0;
-	nfsd_file_put_noref(nf);
-	if (is_hashed)
-		nfsd_file_schedule_laundrette();
 	if (atomic_long_read(&nfsd_filecache_count) >= NFSD_FILE_LRU_LIMIT)
 		nfsd_file_gc();
 }
@@ -328,6 +331,7 @@ nfsd_file_dispose_list(struct list_head *dispose)
 	while(!list_empty(dispose)) {
 		nf = list_first_entry(dispose, struct nfsd_file, nf_lru);
 		list_del(&nf->nf_lru);
+		nfsd_file_flush(nf);
 		nfsd_file_put_noref(nf);
 	}
 }
@@ -341,6 +345,7 @@ nfsd_file_dispose_list_sync(struct list_head *dispose)
 	while(!list_empty(dispose)) {
 		nf = list_first_entry(dispose, struct nfsd_file, nf_lru);
 		list_del(&nf->nf_lru);
+		nfsd_file_flush(nf);
 		if (!refcount_dec_and_test(&nf->nf_ref))
 			continue;
 		if (nfsd_file_free(nf))

fs/nfsd/nfs2acl.c

@@ -249,34 +249,34 @@ nfsaclsvc_encode_getaclres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 	int w;
 
 	if (!svcxdr_encode_stat(xdr, resp->status))
-		return 0;
+		return false;
 
 	if (dentry == NULL || d_really_is_negative(dentry))
-		return 1;
+		return true;
 	inode = d_inode(dentry);
 
 	if (!svcxdr_encode_fattr(rqstp, xdr, &resp->fh, &resp->stat))
-		return 0;
+		return false;
 	if (xdr_stream_encode_u32(xdr, resp->mask) < 0)
-		return 0;
+		return false;
 
 	rqstp->rq_res.page_len = w = nfsacl_size(
 		(resp->mask & NFS_ACL)   ? resp->acl_access  : NULL,
 		(resp->mask & NFS_DFACL) ? resp->acl_default : NULL);
 	while (w > 0) {
 		if (!*(rqstp->rq_next_page++))
-			return 1;
+			return true;
 		w -= PAGE_SIZE;
 	}
 
 	if (!nfs_stream_encode_acl(xdr, inode, resp->acl_access,
 				   resp->mask & NFS_ACL, 0))
-		return 0;
+		return false;
 	if (!nfs_stream_encode_acl(xdr, inode, resp->acl_default,
 				   resp->mask & NFS_DFACL, NFS_ACL_DEFAULT))
-		return 0;
+		return false;
 
-	return 1;
+	return true;
 }
 
 /* ACCESS */
@@ -286,17 +286,17 @@ nfsaclsvc_encode_accessres(struct svc_rqst *rqstp, struct xdr_stream *xdr)
 	struct nfsd3_accessres *resp = rqstp->rq_resp;
 
 	if (!svcxdr_encode_stat(xdr, resp->status))
-		return 0;
+		return false;
 	switch (resp->status) {
 	case nfs_ok:
 		if (!svcxdr_encode_fattr(rqstp, xdr, &resp->fh, &resp->stat))
-			return 0;
+			return false;
 		if (xdr_stream_encode_u32(xdr, resp->access) < 0)
-			return 0;
+			return false;
 		break;
 	}
 
-	return 1;
+	return true;
 }
 
 /*

include/linux/sunrpc/svc.h

@@ -395,6 +395,7 @@ struct svc_deferred_req {
 	size_t			addrlen;
 	struct sockaddr_storage	daddr;	/* where reply must come from */
 	size_t			daddrlen;
+	void			*xprt_ctxt;
 	struct cache_deferred_req handle;
 	size_t			xprt_hlen;
 	int			argslen;

include/trace/events/sunrpc.h

@@ -2015,17 +2015,18 @@ DECLARE_EVENT_CLASS(svc_deferred_event,
 	TP_STRUCT__entry(
 		__field(const void *, dr)
 		__field(u32, xid)
-		__string(addr, dr->xprt->xpt_remotebuf)
+		__array(__u8, addr, INET6_ADDRSTRLEN + 10)
 	),
 
 	TP_fast_assign(
 		__entry->dr = dr;
 		__entry->xid = be32_to_cpu(*(__be32 *)(dr->args +
 						       (dr->xprt_hlen>>2)));
-		__assign_str(addr, dr->xprt->xpt_remotebuf);
+		snprintf(__entry->addr, sizeof(__entry->addr) - 1,
+			 "%pISpc", (struct sockaddr *)&dr->addr);
 	),
 
-	TP_printk("addr=%s dr=%p xid=0x%08x", __get_str(addr), __entry->dr,
+	TP_printk("addr=%s dr=%p xid=0x%08x", __entry->addr, __entry->dr,
 		__entry->xid)
 );
 

net/sunrpc/svc_xprt.c

@@ -1231,6 +1231,8 @@ static struct cache_deferred_req *svc_defer(struct cache_req *req)
 		dr->daddr = rqstp->rq_daddr;
 		dr->argslen = rqstp->rq_arg.len >> 2;
 		dr->xprt_hlen = rqstp->rq_xprt_hlen;
+		dr->xprt_ctxt = rqstp->rq_xprt_ctxt;
+		rqstp->rq_xprt_ctxt = NULL;
 
 		/* back up head to the start of the buffer and copy */
 		skip = rqstp->rq_arg.len - rqstp->rq_arg.head[0].iov_len;
@@ -1269,6 +1271,7 @@ static noinline int svc_deferred_recv(struct svc_rqst *rqstp)
 	rqstp->rq_xprt_hlen   = dr->xprt_hlen;
 	rqstp->rq_daddr       = dr->daddr;
 	rqstp->rq_respages    = rqstp->rq_pages;
+	rqstp->rq_xprt_ctxt   = dr->xprt_ctxt;
 	svc_xprt_received(rqstp->rq_xprt);
 	return (dr->argslen<<2) - dr->xprt_hlen;
 }

net/sunrpc/xprtrdma/svc_rdma_recvfrom.c

@@ -831,7 +831,7 @@ int svc_rdma_recvfrom(struct svc_rqst *rqstp)
 		goto out_err;
 	if (ret == 0)
 		goto out_drop;
-	rqstp->rq_xprt_hlen = ret;
+	rqstp->rq_xprt_hlen = 0;
 
 	if (svc_rdma_is_reverse_direction_reply(xprt, ctxt))
 		goto out_backchannel;