Merge tag 'nfs-for-7.1-1' of git://git.linux-nfs.org/projects/trondmy/linux-nfs

Pull NFS client updates from Trond Myklebust:
 "Bugfixes:

   - Fix handling of ENOSPC so that if we have to resend writes, they
     are written synchronously

   - SUNRPC RDMA transport fixes from Chuck

   - Several fixes for delegated timestamps in NFSv4.2

   - Failure to obtain a directory delegation should not cause stat() to
     fail with NFSv4

   - Rename was failing to update timestamps when a directory delegation
     is held on NFSv4

   - Ensure we check rsize/wsize after crossing a NFSv4 filesystem
     boundary

   - NFSv4/pnfs:

      - If the server is down, retry the layout returns on reboot

      - Fallback to MDS could result in a short write being incorrectly
        logged

  Cleanups:

   - Use memcpy_and_pad in decode_fh"

* tag 'nfs-for-7.1-1' of git://git.linux-nfs.org/projects/trondmy/linux-nfs: (21 commits)
  NFS: Fix RCU dereference of cl_xprt in nfs_compare_super_address
  NFS: remove redundant __private attribute from nfs_page_class
  NFSv4.2: fix CLONE/COPY attrs in presence of delegated attributes
  NFS: fix writeback in presence of errors
  nfs: use memcpy_and_pad in decode_fh
  NFSv4.1: Apply session size limits on clone path
  NFSv4: retry GETATTR if GET_DIR_DELEGATION failed
  NFS: fix RENAME attr in presence of directory delegations
  pnfs/flexfiles: validate ds_versions_cnt is non-zero
  NFS/blocklayout: print each device used for SCSI layouts
  xprtrdma: Post receive buffers after RPC completion
  xprtrdma: Scale receive batch size with credit window
  xprtrdma: Replace rpcrdma_mr_seg with xdr_buf cursor
  xprtrdma: Decouple frwr_wp_create from frwr_map
  xprtrdma: Close lost-wakeup race in xprt_rdma_alloc_slot
  xprtrdma: Avoid 250 ms delay on backlog wakeup
  xprtrdma: Close sendctx get/put race that can block a transport
  nfs: update inode ctime after removexattr operation
  nfs: fix utimensat() for atime with delegated timestamps
  NFS: improve "Server wrote zero bytes" error
  ...

fs/nfs/blocklayout/dev.c

@@ -370,11 +370,14 @@ bl_open_path(struct pnfs_block_volume *v, const char *prefix)
 	if (!devname)
 		return ERR_PTR(-ENOMEM);
 
-	bdev_file = bdev_file_open_by_path(devname, BLK_OPEN_READ | BLK_OPEN_WRITE,
-					NULL, NULL);
+	bdev_file = bdev_file_open_by_path(devname,
+			BLK_OPEN_READ | BLK_OPEN_WRITE, NULL, NULL);
 	if (IS_ERR(bdev_file)) {
 		dprintk("failed to open device %s (%ld)\n",
 			devname, PTR_ERR(bdev_file));
+	} else {
+		pr_info("pNFS: using block device %s\n",
+			file_bdev(bdev_file)->bd_disk->disk_name);
 	}
 
 	kfree(devname);

fs/nfs/callback_xdr.c

@@ -96,8 +96,7 @@ static __be32 decode_fh(struct xdr_stream *xdr, struct nfs_fh *fh)
 	p = xdr_inline_decode(xdr, fh->size);
 	if (unlikely(p == NULL))
 		return htonl(NFS4ERR_RESOURCE);
-	memcpy(&fh->data[0], p, fh->size);
-	memset(&fh->data[fh->size], 0, sizeof(fh->data) - fh->size);
+	memcpy_and_pad(fh->data, sizeof(fh->data), p, fh->size, 0);
 	return 0;
 }
 

fs/nfs/flexfilelayout/flexfilelayoutdev.c

@@ -97,6 +97,11 @@ nfs4_ff_alloc_deviceid_node(struct nfs_server *server, struct pnfs_device *pdev,
 	if (unlikely(!p))
 		goto out_err_drain_dsaddrs;
 	version_count = be32_to_cpup(p);
+
+	if (version_count == 0) {
+		ret = -EINVAL;
+		goto out_err_drain_dsaddrs;
+	}
 	dprintk("%s: version count %d\n", __func__, version_count);
 
 	ds_versions = kzalloc_objs(struct nfs4_ff_ds_version, version_count,

fs/nfs/inode.c

@@ -692,7 +692,8 @@ void nfs_update_delegated_atime(struct inode *inode)
 
 void nfs_update_delegated_mtime_locked(struct inode *inode)
 {
-	if (nfs_have_delegated_mtime(inode))
+	if (nfs_have_delegated_mtime(inode) ||
+	    nfs_have_directory_delegation(inode))
 		nfs_update_mtime(inode);
 }
 
@@ -757,14 +758,7 @@ nfs_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
 	} else if (nfs_have_delegated_atime(inode) &&
 		   attr->ia_valid & ATTR_ATIME &&
 		   !(attr->ia_valid & ATTR_MTIME)) {
-		if (attr->ia_valid & ATTR_ATIME_SET) {
-			if (uid_eq(task_uid, owner_uid)) {
-				spin_lock(&inode->i_lock);
-				nfs_set_timestamps_to_ts(inode, attr);
-				spin_unlock(&inode->i_lock);
-				attr->ia_valid &= ~(ATTR_ATIME|ATTR_ATIME_SET);
-			}
-		} else {
+		if (!(attr->ia_valid & ATTR_ATIME_SET)) {
 			nfs_update_delegated_atime(inode);
 			attr->ia_valid &= ~ATTR_ATIME;
 		}

fs/nfs/internal.h

@@ -253,6 +253,8 @@ extern struct nfs_client *nfs4_set_ds_client(struct nfs_server *mds_srv,
 					     u32 minor_version);
 extern struct rpc_clnt *nfs4_find_or_create_ds_client(struct nfs_client *,
 						struct inode *);
+extern void nfs4_session_limit_rwsize(struct nfs_server *server);
+extern void nfs4_session_limit_xasize(struct nfs_server *server);
 extern struct nfs_client *nfs3_set_ds_client(struct nfs_server *mds_srv,
 			const struct sockaddr_storage *ds_addr, int ds_addrlen,
 			int ds_proto, unsigned int ds_timeo,

fs/nfs/localio.c

@@ -865,6 +865,8 @@ static void nfs_local_call_write(struct work_struct *work)
 	file_start_write(filp);
 	n_iters = atomic_read(&iocb->n_iters);
 	for (int i = 0; i < n_iters ; i++) {
+		size_t icount;
+
 		if (iocb->iter_is_dio_aligned[i]) {
 			iocb->kiocb.ki_flags |= IOCB_DIRECT;
 			/* Only use AIO completion if DIO-aligned segment is last */
@@ -881,8 +883,16 @@ static void nfs_local_call_write(struct work_struct *work)
 		if (status == -EIOCBQUEUED)
 			continue;
 		/* Break on completion, errors, or short writes */
+		icount = iov_iter_count(&iocb->iters[i]);
 		if (nfs_local_pgio_done(iocb, status) || status < 0 ||
-		    (size_t)status < iov_iter_count(&iocb->iters[i])) {
+		    (size_t)status < icount) {
+			if ((size_t)status < icount) {
+				struct nfs_lock_context *ctx =
+					iocb->hdr->req->wb_lock_context;
+
+				set_bit(NFS_CONTEXT_WRITE_SYNC,
+					&ctx->open_context->flags);
+			}
 			nfs_local_write_iocb_done(iocb);
 			break;
 		}
@@ -901,6 +911,9 @@ static void nfs_local_do_write(struct nfs_local_kiocb *iocb,
 		__func__, hdr->args.count, hdr->args.offset,
 		(hdr->args.stable == NFS_UNSTABLE) ?  "unstable" : "stable");
 
+	if (test_bit(NFS_CONTEXT_WRITE_SYNC,
+		     &hdr->req->wb_lock_context->open_context->flags))
+		hdr->args.stable = NFS_FILE_SYNC;
 	switch (hdr->args.stable) {
 	default:
 		break;

fs/nfs/nfs42proc.c

@@ -401,6 +401,7 @@ static void nfs42_copy_dest_done(struct file *file, loff_t pos, loff_t len,
 					     NFS_INO_INVALID_MTIME |
 					     NFS_INO_INVALID_BLOCKS);
 	spin_unlock(&inode->i_lock);
+	nfs_update_delegated_mtime(inode);
 }
 
 static ssize_t _nfs42_proc_copy(struct file *src,
@@ -1372,11 +1373,15 @@ out_put_src_lock:
 static int _nfs42_proc_removexattr(struct inode *inode, const char *name)
 {
 	struct nfs_server *server = NFS_SERVER(inode);
+	__u32 bitmask[NFS_BITMASK_SZ];
 	struct nfs42_removexattrargs args = {
 		.fh = NFS_FH(inode),
+		.bitmask = bitmask,
 		.xattr_name = name,
 	};
-	struct nfs42_removexattrres res;
+	struct nfs42_removexattrres res = {
+		.server = server,
+	};
 	struct rpc_message msg = {
 		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVEXATTR],
 		.rpc_argp = &args,
@@ -1385,12 +1390,22 @@ static int _nfs42_proc_removexattr(struct inode *inode, const char *name)
 	int ret;
 	unsigned long timestamp = jiffies;
 
+	res.fattr = nfs_alloc_fattr();
+	if (!res.fattr)
+		return -ENOMEM;
+
+	nfs4_bitmask_set(bitmask, server->cache_consistency_bitmask,
+			 inode, NFS_INO_INVALID_CHANGE);
+
 	ret = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
 	    &res.seq_res, 1);
 	trace_nfs4_removexattr(inode, name, ret);
-	if (!ret)
+	if (!ret) {
 		nfs4_update_changeattr(inode, &res.cinfo, timestamp, 0);
+		ret = nfs_post_op_update_inode(inode, res.fattr);
+	}
 
+	kfree(res.fattr);
 	return ret;
 }
 

fs/nfs/nfs42xdr.c

@@ -263,11 +263,13 @@
 #define NFS4_enc_removexattr_sz		(compound_encode_hdr_maxsz + \
 					 encode_sequence_maxsz + \
 					 encode_putfh_maxsz + \
-					 encode_removexattr_maxsz)
+					 encode_removexattr_maxsz + \
+					 encode_getattr_maxsz)
 #define NFS4_dec_removexattr_sz		(compound_decode_hdr_maxsz + \
 					 decode_sequence_maxsz + \
 					 decode_putfh_maxsz + \
-					 decode_removexattr_maxsz)
+					 decode_removexattr_maxsz + \
+					 decode_getattr_maxsz)
 
 /*
  * These values specify the maximum amount of data that is not
@@ -869,6 +871,7 @@ static void nfs4_xdr_enc_removexattr(struct rpc_rqst *req,
 	encode_sequence(xdr, &args->seq_args, &hdr);
 	encode_putfh(xdr, args->fh, &hdr);
 	encode_removexattr(xdr, args->xattr_name, &hdr);
+	encode_getfattr(xdr, args->bitmask, &hdr);
 	encode_nops(&hdr);
 }
 
@@ -1818,6 +1821,9 @@ static int nfs4_xdr_dec_removexattr(struct rpc_rqst *req,
 		goto out;
 
 	status = decode_removexattr(xdr, &res->cinfo);
+	if (status)
+		goto out;
+	status = decode_getfattr(xdr, res->fattr, res->server);
 out:
 	return status;
 }

fs/nfs/nfs4client.c

@@ -855,7 +855,7 @@ EXPORT_SYMBOL_GPL(nfs4_set_ds_client);
  * Limit the mount rsize, wsize and dtsize using negotiated fore
  * channel attributes.
  */
-static void nfs4_session_limit_rwsize(struct nfs_server *server)
+void nfs4_session_limit_rwsize(struct nfs_server *server)
 {
 	struct nfs4_session *sess;
 	u32 server_resp_sz;
@@ -878,7 +878,7 @@ static void nfs4_session_limit_rwsize(struct nfs_server *server)
 /*
  * Limit xattr sizes using the channel attributes.
  */
-static void nfs4_session_limit_xasize(struct nfs_server *server)
+void nfs4_session_limit_xasize(struct nfs_server *server)
 {
 #ifdef CONFIG_NFS_V4_2
 	struct nfs4_session *sess;

fs/nfs/nfs4proc.c

@@ -4469,6 +4469,13 @@ static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
 		case -ENOTSUPP:
 		case -EOPNOTSUPP:
 			server->caps &= ~NFS_CAP_DIR_DELEG;
+			break;
+		case -NFS4ERR_INVAL:
+		case -NFS4ERR_IO:
+		case -NFS4ERR_DIRDELEG_UNAVAIL:
+		case -NFS4ERR_NOTDIR:
+			clear_bit(NFS_INO_REQ_DIR_DELEG, &(NFS_I(inode)->flags));
+			status = -EAGAIN;
 		}
 	}
 
@@ -4490,6 +4497,7 @@ int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
 		default:
 			err = nfs4_handle_exception(server, err, &exception);
 			break;
+		case -EAGAIN:
 		case -ENOTSUPP:
 		case -EOPNOTSUPP:
 			exception.retry = true;
@@ -5052,6 +5060,7 @@ static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
 					res->new_fattr->time_start,
 					NFS_INO_INVALID_NLINK |
 					    NFS_INO_INVALID_DATA);
+			nfs_update_delegated_mtime(new_dir);
 		} else
 			nfs4_update_changeattr(old_dir, &res->old_cinfo,
 					res->old_fattr->time_start,
@@ -9769,16 +9778,26 @@ static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
 	if (!nfs41_sequence_process(task, &lrp->res.seq_res))
 		return;
 
-	if (task->tk_rpc_status == -ETIMEDOUT) {
-		lrp->rpc_status = -EAGAIN;
-		lrp->res.lrs_present = 0;
-		return;
-	}
-	/*
-	 * Was there an RPC level error? Assume the call succeeded,
-	 * and that we need to release the layout
-	 */
-	if (task->tk_rpc_status != 0 && RPC_WAS_SENT(task)) {
+	if (task->tk_rpc_status < 0) {
+		switch (task->tk_rpc_status) {
+		case -EACCES:
+		case -EIO:
+		case -EKEYEXPIRED:
+		case -ERESTARTSYS:
+		case -EINTR:
+			lrp->rpc_status = 0;
+			break;
+		case -ENETDOWN:
+		case -ENETUNREACH:
+			if (task->tk_flags & RPC_TASK_NETUNREACH_FATAL)
+				lrp->rpc_status = 0;
+			else
+				lrp->rpc_status = -EAGAIN;
+			break;
+		default:
+			lrp->rpc_status = -EAGAIN;
+			break;
+		}
 		lrp->res.lrs_present = 0;
 		return;
 	}
@@ -10618,6 +10637,9 @@ static struct nfs_server *nfs4_clone_server(struct nfs_server *source,
 	if (IS_ERR(server))
 		return server;
 
+	nfs4_session_limit_rwsize(server);
+	nfs4_session_limit_xasize(server);
+
 	error = nfs4_delegation_hash_alloc(server);
 	if (error) {
 		nfs_free_server(server);

fs/nfs/nfstrace.h

@@ -1496,7 +1496,7 @@ DECLARE_EVENT_CLASS(nfs_page_class,
 			__field(dev_t, dev)
 			__field(u32, fhandle)
 			__field(u64, fileid)
-			__field(const struct nfs_page *__private, req)
+			__field(const struct nfs_page *, req)
 			__field(loff_t, offset)
 			__field(unsigned int, count)
 			__field(unsigned long, flags)

fs/nfs/pagelist.c

@@ -1186,6 +1186,9 @@ static int __nfs_pageio_add_request(struct nfs_pageio_descriptor *desc,
 
 	nfs_page_group_lock(req);
 
+	if (test_bit(NFS_CONTEXT_WRITE_SYNC,
+		     &req->wb_lock_context->open_context->flags))
+		desc->pg_ioflags |= FLUSH_STABLE;
 	subreq = req;
 	subreq_size = subreq->wb_bytes;
 	for(;;) {

fs/nfs/pnfs.c

@@ -1698,11 +1698,23 @@ int pnfs_roc_done(struct rpc_task *task, struct nfs4_layoutreturn_args **argpp,
 		/* If the call was not sent, let caller handle it */
 		if (!RPC_WAS_SENT(task))
 			return 0;
-		/*
-		 * Otherwise, assume the call succeeded and
-		 * that we need to release the layout
-		 */
-		*ret = 0;
+		switch (task->tk_rpc_status) {
+		default:
+			/*
+			 * Defer the layoutreturn if it was due
+			 * to the server being down.
+			 */
+			*ret = -NFS4ERR_NOMATCHING_LAYOUT;
+			break;
+		case -EACCES:
+		case -EIO:
+		case -EKEYEXPIRED:
+		case -ERESTARTSYS:
+		case -EINTR:
+			/* Don't retry */
+			*ret = 0;
+			break;
+		}
 		(*respp)->lrs_present = 0;
 		retval = 0;
 		break;

fs/nfs/super.c

@@ -1166,12 +1166,18 @@ static int nfs_set_super(struct super_block *s, struct fs_context *fc)
 static int nfs_compare_super_address(struct nfs_server *server1,
 				     struct nfs_server *server2)
 {
+	struct rpc_xprt *xprt1, *xprt2;
 	struct sockaddr *sap1, *sap2;
-	struct rpc_xprt *xprt1 = server1->client->cl_xprt;
-	struct rpc_xprt *xprt2 = server2->client->cl_xprt;
+
+	rcu_read_lock();
+
+	xprt1 = rcu_dereference(server1->client->cl_xprt);
+	xprt2 = rcu_dereference(server2->client->cl_xprt);
 
 	if (!net_eq(xprt1->xprt_net, xprt2->xprt_net))
-		return 0;
+		goto out_unlock;
+
+	rcu_read_unlock();
 
 	sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr;
 	sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr;
@@ -1203,6 +1209,10 @@ static int nfs_compare_super_address(struct nfs_server *server1,
 	}
 
 	return 1;
+
+out_unlock:
+	rcu_read_unlock();
+	return 0;
 }
 
 static int nfs_compare_userns(const struct nfs_server *old,

fs/nfs/write.c

@@ -926,9 +926,13 @@ static void nfs_write_completion(struct nfs_pgio_header *hdr)
 			goto remove_req;
 		}
 		if (nfs_write_need_commit(hdr)) {
+			struct nfs_open_context *ctx =
+				hdr->req->wb_lock_context->open_context;
+
 			/* Reset wb_nio, since the write was successful. */
 			req->wb_nio = 0;
 			memcpy(&req->wb_verf, &hdr->verf.verifier, sizeof(req->wb_verf));
+			clear_bit(NFS_CONTEXT_WRITE_SYNC, &ctx->flags);
 			nfs_mark_request_commit(req, hdr->lseg, &cinfo,
 				hdr->ds_commit_idx);
 			goto next;
@@ -1550,9 +1554,12 @@ static void nfs_writeback_result(struct rpc_task *task,
 	struct nfs_pgio_args	*argp = &hdr->args;
 	struct nfs_pgio_res	*resp = &hdr->res;
 
-	if (resp->count < argp->count) {
+	if (resp->count < argp->count && !list_empty(&hdr->pages)) {
 		static unsigned long    complain;
+		struct nfs_open_context *ctx =
+			hdr->req->wb_lock_context->open_context;
 
+		set_bit(NFS_CONTEXT_WRITE_SYNC, &ctx->flags);
 		/* This a short write! */
 		nfs_inc_stats(hdr->inode, NFSIOS_SHORTWRITE);
 
@@ -1836,6 +1843,8 @@ static void nfs_commit_release_pages(struct nfs_commit_data *data)
 		/* We have a mismatch. Write the page again */
 		dprintk(" mismatch\n");
 		nfs_mark_request_dirty(req);
+		set_bit(NFS_CONTEXT_WRITE_SYNC,
+			&req->wb_lock_context->open_context->flags);
 		atomic_long_inc(&NFS_I(data->inode)->redirtied_pages);
 	next:
 		nfs_unlock_and_release_request(req);

include/linux/nfs_fs.h

@@ -109,6 +109,7 @@ struct nfs_open_context {
 #define NFS_CONTEXT_BAD			(2)
 #define NFS_CONTEXT_UNLOCK	(3)
 #define NFS_CONTEXT_FILE_OPEN		(4)
+#define NFS_CONTEXT_WRITE_SYNC		(5)
 
 	struct nfs4_threshold	*mdsthreshold;
 	struct list_head list;

include/linux/nfs_xdr.h

@@ -1611,12 +1611,15 @@ struct nfs42_listxattrsres {
 struct nfs42_removexattrargs {
 	struct nfs4_sequence_args	seq_args;
 	struct nfs_fh			*fh;
+	const u32			*bitmask;
 	const char			*xattr_name;
 };
 
 struct nfs42_removexattrres {
 	struct nfs4_sequence_res	seq_res;
 	struct nfs4_change_info		cinfo;
+	struct nfs_fattr		*fattr;
+	const struct nfs_server		*server;
 };
 
 #endif /* CONFIG_NFS_V4_2 */

include/linux/sunrpc/xprt.h

@@ -404,6 +404,8 @@ struct rpc_xprt *	xprt_alloc(struct net *net, size_t size,
 				unsigned int max_req);
 void			xprt_free(struct rpc_xprt *);
 void			xprt_add_backlog(struct rpc_xprt *xprt, struct rpc_task *task);
+void			xprt_add_backlog_noncongested(struct rpc_xprt *xprt,
+					struct rpc_task *task);
 bool			xprt_wake_up_backlog(struct rpc_xprt *xprt, struct rpc_rqst *req);
 void			xprt_cleanup_ids(void);
 

include/trace/events/rpcrdma.h

@@ -392,10 +392,10 @@ DECLARE_EVENT_CLASS(xprtrdma_rdch_event,
 		const struct rpc_task *task,
 		unsigned int pos,
 		struct rpcrdma_mr *mr,
-		int nsegs
+		bool is_last
 	),
 
-	TP_ARGS(task, pos, mr, nsegs),
+	TP_ARGS(task, pos, mr, is_last),
 
 	TP_STRUCT__entry(
 		__field(unsigned int, task_id)
@@ -405,7 +405,7 @@ DECLARE_EVENT_CLASS(xprtrdma_rdch_event,
 		__field(u32, handle)
 		__field(u32, length)
 		__field(u64, offset)
-		__field(int, nsegs)
+		__field(bool, is_last)
 	),
 
 	TP_fast_assign(
@@ -416,7 +416,7 @@ DECLARE_EVENT_CLASS(xprtrdma_rdch_event,
 		__entry->handle = mr->mr_handle;
 		__entry->length = mr->mr_length;
 		__entry->offset = mr->mr_offset;
-		__entry->nsegs = nsegs;
+		__entry->is_last = is_last;
 	),
 
 	TP_printk(SUNRPC_TRACE_TASK_SPECIFIER
@@ -424,7 +424,7 @@ DECLARE_EVENT_CLASS(xprtrdma_rdch_event,
 		__entry->task_id, __entry->client_id,
 		__entry->pos, __entry->length,
 		(unsigned long long)__entry->offset, __entry->handle,
-		__entry->nents < __entry->nsegs ? "more" : "last"
+		__entry->is_last ? "last" : "more"
 	)
 );
 
@@ -434,18 +434,18 @@ DECLARE_EVENT_CLASS(xprtrdma_rdch_event,
 					const struct rpc_task *task,	\
 					unsigned int pos,		\
 					struct rpcrdma_mr *mr,		\
-					int nsegs			\
+					bool is_last			\
 				),					\
-				TP_ARGS(task, pos, mr, nsegs))
+				TP_ARGS(task, pos, mr, is_last))
 
 DECLARE_EVENT_CLASS(xprtrdma_wrch_event,
 	TP_PROTO(
 		const struct rpc_task *task,
 		struct rpcrdma_mr *mr,
-		int nsegs
+		bool is_last
 	),
 
-	TP_ARGS(task, mr, nsegs),
+	TP_ARGS(task, mr, is_last),
 
 	TP_STRUCT__entry(
 		__field(unsigned int, task_id)
@@ -454,7 +454,7 @@ DECLARE_EVENT_CLASS(xprtrdma_wrch_event,
 		__field(u32, handle)
 		__field(u32, length)
 		__field(u64, offset)
-		__field(int, nsegs)
+		__field(bool, is_last)
 	),
 
 	TP_fast_assign(
@@ -464,7 +464,7 @@ DECLARE_EVENT_CLASS(xprtrdma_wrch_event,
 		__entry->handle = mr->mr_handle;
 		__entry->length = mr->mr_length;
 		__entry->offset = mr->mr_offset;
-		__entry->nsegs = nsegs;
+		__entry->is_last = is_last;
 	),
 
 	TP_printk(SUNRPC_TRACE_TASK_SPECIFIER
@@ -472,7 +472,7 @@ DECLARE_EVENT_CLASS(xprtrdma_wrch_event,
 		__entry->task_id, __entry->client_id,
 		__entry->length, (unsigned long long)__entry->offset,
 		__entry->handle,
-		__entry->nents < __entry->nsegs ? "more" : "last"
+		__entry->is_last ? "last" : "more"
 	)
 );
 
@@ -481,9 +481,9 @@ DECLARE_EVENT_CLASS(xprtrdma_wrch_event,
 				TP_PROTO(				\
 					const struct rpc_task *task,	\
 					struct rpcrdma_mr *mr,		\
-					int nsegs			\
+					bool is_last			\
 				),					\
-				TP_ARGS(task, mr, nsegs))
+				TP_ARGS(task, mr, is_last))
 
 TRACE_DEFINE_ENUM(DMA_BIDIRECTIONAL);
 TRACE_DEFINE_ENUM(DMA_TO_DEVICE);

net/sunrpc/xprt.c

@@ -1663,6 +1663,22 @@ void xprt_add_backlog(struct rpc_xprt *xprt, struct rpc_task *task)
 }
 EXPORT_SYMBOL_GPL(xprt_add_backlog);
 
+/**
+ * xprt_add_backlog_noncongested - queue task on backlog
+ * @xprt: transport whose backlog queue receives the task
+ * @task: task to queue
+ *
+ * Like xprt_add_backlog, but does not set XPRT_CONGESTED.
+ * For transports whose free_slot path does not synchronize
+ * with xprt_throttle_congested via reserve_lock.
+ */
+void xprt_add_backlog_noncongested(struct rpc_xprt *xprt,
+				   struct rpc_task *task)
+{
+	rpc_sleep_on(&xprt->backlog, task, xprt_complete_request_init);
+}
+EXPORT_SYMBOL_GPL(xprt_add_backlog_noncongested);
+
 static bool __xprt_set_rq(struct rpc_task *task, void *data)
 {
 	struct rpc_rqst *req = data;