four cifs.ko client fixes

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Merge tag 'v6.11-rc5-client-fixes' of git://git.samba.org/sfrench/cifs-2.6

Pull smb client fixes from Steve French:

 - two RDMA/smbdirect fixes and a minor cleanup

 - punch hole fix

* tag 'v6.11-rc5-client-fixes' of git://git.samba.org/sfrench/cifs-2.6:
  cifs: Fix FALLOC_FL_PUNCH_HOLE support
  smb/client: fix rdma usage in smb2_async_writev()
  smb/client: remove unused rq_iter_size from struct smb_rqst
  smb/client: avoid dereferencing rdata=NULL in smb2_new_read_req()

fs/smb/client/cifsglob.h

@@ -254,7 +254,6 @@ struct cifs_open_info_data {
 struct smb_rqst {
 	struct kvec	*rq_iov;	/* array of kvecs */
 	unsigned int	rq_nvec;	/* number of kvecs in array */
-	size_t		rq_iter_size;	/* Amount of data in ->rq_iter */
 	struct iov_iter	rq_iter;	/* Data iterator */
 	struct xarray	rq_buffer;	/* Page buffer for encryption */
 };

fs/smb/client/cifssmb.c

@@ -1713,7 +1713,6 @@ cifs_async_writev(struct cifs_io_subrequest *wdata)
 	rqst.rq_iov = iov;
 	rqst.rq_nvec = 2;
 	rqst.rq_iter = wdata->subreq.io_iter;
-	rqst.rq_iter_size = iov_iter_count(&wdata->subreq.io_iter);
 
 	cifs_dbg(FYI, "async write at %llu %zu bytes\n",
 		 wdata->subreq.start, wdata->subreq.len);

fs/smb/client/smb2ops.c

@@ -3305,6 +3305,7 @@ static long smb3_punch_hole(struct file *file, struct cifs_tcon *tcon,
 	struct inode *inode = file_inode(file);
 	struct cifsFileInfo *cfile = file->private_data;
 	struct file_zero_data_information fsctl_buf;
+	unsigned long long end = offset + len, i_size, remote_i_size;
 	long rc;
 	unsigned int xid;
 	__u8 set_sparse = 1;
@@ -3336,6 +3337,27 @@ static long smb3_punch_hole(struct file *file, struct cifs_tcon *tcon,
 			(char *)&fsctl_buf,
 			sizeof(struct file_zero_data_information),
 			CIFSMaxBufSize, NULL, NULL);
+
+	if (rc)
+		goto unlock;
+
+	/* If there's dirty data in the buffer that would extend the EOF if it
+	 * were written, then we need to move the EOF marker over to the lower
+	 * of the high end of the hole and the proposed EOF.  The problem is
+	 * that we locally hole-punch the tail of the dirty data, the proposed
+	 * EOF update will end up in the wrong place.
+	 */
+	i_size = i_size_read(inode);
+	remote_i_size = netfs_inode(inode)->remote_i_size;
+	if (end > remote_i_size && i_size > remote_i_size) {
+		unsigned long long extend_to = umin(end, i_size);
+		rc = SMB2_set_eof(xid, tcon, cfile->fid.persistent_fid,
+				  cfile->fid.volatile_fid, cfile->pid, extend_to);
+		if (rc >= 0)
+			netfs_inode(inode)->remote_i_size = extend_to;
+	}
+
+unlock:
 	filemap_invalidate_unlock(inode->i_mapping);
 out:
 	inode_unlock(inode);
@@ -4446,7 +4468,6 @@ smb3_init_transform_rq(struct TCP_Server_Info *server, int num_rqst,
 			}
 			iov_iter_xarray(&new->rq_iter, ITER_SOURCE,
 					buffer, 0, size);
-			new->rq_iter_size = size;
 		}
 	}
 
@@ -4492,7 +4513,6 @@ decrypt_raw_data(struct TCP_Server_Info *server, char *buf,
 	rqst.rq_nvec = 2;
 	if (iter) {
 		rqst.rq_iter = *iter;
-		rqst.rq_iter_size = iov_iter_count(iter);
 		iter_size = iov_iter_count(iter);
 	}
 

fs/smb/client/smb2pdu.c

@@ -4441,7 +4441,7 @@ smb2_new_read_req(void **buf, unsigned int *total_len,
 	 * If we want to do a RDMA write, fill in and append
 	 * smbd_buffer_descriptor_v1 to the end of read request
 	 */
-	if (smb3_use_rdma_offload(io_parms)) {
+	if (rdata && smb3_use_rdma_offload(io_parms)) {
 		struct smbd_buffer_descriptor_v1 *v1;
 		bool need_invalidate = server->dialect == SMB30_PROT_ID;
 
@@ -4523,7 +4523,6 @@ smb2_readv_callback(struct mid_q_entry *mid)
 
 	if (rdata->got_bytes) {
 		rqst.rq_iter	  = rdata->subreq.io_iter;
-		rqst.rq_iter_size = iov_iter_count(&rdata->subreq.io_iter);
 	}
 
 	WARN_ONCE(rdata->server != mid->server,
@@ -4914,6 +4913,13 @@ smb2_async_writev(struct cifs_io_subrequest *wdata)
 	if (rc)
 		goto out;
 
+	rqst.rq_iov = iov;
+	rqst.rq_iter = wdata->subreq.io_iter;
+
+	rqst.rq_iov[0].iov_len = total_len - 1;
+	rqst.rq_iov[0].iov_base = (char *)req;
+	rqst.rq_nvec += 1;
+
 	if (smb3_encryption_required(tcon))
 		flags |= CIFS_TRANSFORM_REQ;
 
@@ -4925,6 +4931,7 @@ smb2_async_writev(struct cifs_io_subrequest *wdata)
 	req->WriteChannelInfoOffset = 0;
 	req->WriteChannelInfoLength = 0;
 	req->Channel = SMB2_CHANNEL_NONE;
+	req->Length = cpu_to_le32(io_parms->length);
 	req->Offset = cpu_to_le64(io_parms->offset);
 	req->DataOffset = cpu_to_le16(
 				offsetof(struct smb2_write_req, Buffer));
@@ -4944,7 +4951,6 @@ smb2_async_writev(struct cifs_io_subrequest *wdata)
 	 */
 	if (smb3_use_rdma_offload(io_parms)) {
 		struct smbd_buffer_descriptor_v1 *v1;
-		size_t data_size = iov_iter_count(&wdata->subreq.io_iter);
 		bool need_invalidate = server->dialect == SMB30_PROT_ID;
 
 		wdata->mr = smbd_register_mr(server->smbd_conn, &wdata->subreq.io_iter,
@@ -4953,9 +4959,10 @@ smb2_async_writev(struct cifs_io_subrequest *wdata)
 			rc = -EAGAIN;
 			goto async_writev_out;
 		}
+		/* For RDMA read, I/O size is in RemainingBytes not in Length */
+		req->RemainingBytes = req->Length;
 		req->Length = 0;
 		req->DataOffset = 0;
-		req->RemainingBytes = cpu_to_le32(data_size);
 		req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
 		if (need_invalidate)
 			req->Channel = SMB2_CHANNEL_RDMA_V1;
@@ -4967,31 +4974,22 @@ smb2_async_writev(struct cifs_io_subrequest *wdata)
 		v1->offset = cpu_to_le64(wdata->mr->mr->iova);
 		v1->token = cpu_to_le32(wdata->mr->mr->rkey);
 		v1->length = cpu_to_le32(wdata->mr->mr->length);
+
+		rqst.rq_iov[0].iov_len += sizeof(*v1);
+
+		/*
+		 * We keep wdata->subreq.io_iter,
+		 * but we have to truncate rqst.rq_iter
+		 */
+		iov_iter_truncate(&rqst.rq_iter, 0);
 	}
 #endif
-	iov[0].iov_len = total_len - 1;
-	iov[0].iov_base = (char *)req;
 
-	rqst.rq_iov = iov;
-	rqst.rq_nvec = 1;
-	rqst.rq_iter = wdata->subreq.io_iter;
-	rqst.rq_iter_size = iov_iter_count(&rqst.rq_iter);
 	if (test_bit(NETFS_SREQ_RETRYING, &wdata->subreq.flags))
 		smb2_set_replay(server, &rqst);
-#ifdef CONFIG_CIFS_SMB_DIRECT
-	if (wdata->mr)
-		iov[0].iov_len += sizeof(struct smbd_buffer_descriptor_v1);
-#endif
-	cifs_dbg(FYI, "async write at %llu %u bytes iter=%zx\n",
-		 io_parms->offset, io_parms->length, iov_iter_count(&rqst.rq_iter));
 
-#ifdef CONFIG_CIFS_SMB_DIRECT
+	cifs_dbg(FYI, "async write at %llu %u bytes iter=%zx\n",
-	/* For RDMA read, I/O size is in RemainingBytes not in Length */
+		 io_parms->offset, io_parms->length, iov_iter_count(&wdata->subreq.io_iter));
-	if (!wdata->mr)
-		req->Length = cpu_to_le32(io_parms->length);
-#else
-	req->Length = cpu_to_le32(io_parms->length);
-#endif
 
 	if (wdata->credits.value > 0) {
 		shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(wdata->subreq.len,