CIFS: Use separate var for the number of bytes got in async read

and don't mix it with the number of bytes that was requested.
Signed-off-by: Pavel Shilovsky <pshilovsky@samba.org>
Signed-off-by: Steve French <smfrench@gmail.com>

fs/cifs/cifsglob.h

@@ -1059,6 +1059,7 @@ struct cifs_readdata {
 	struct address_space		*mapping;
 	__u64				offset;
 	unsigned int			bytes;
+	unsigned int			got_bytes;
 	pid_t				pid;
 	int				result;
 	struct work_struct		work;

fs/cifs/cifssmb.c

@@ -1513,7 +1513,7 @@ cifs_readv_receive(struct TCP_Server_Info *server, struct mid_q_entry *mid)
 		return length;
 
 	server->total_read += length;
-	rdata->bytes = length;
+	rdata->got_bytes = length;
 
 	cifs_dbg(FYI, "total_read=%u buflen=%u remaining=%u\n",
 		 server->total_read, buflen, data_len);
@@ -1556,8 +1556,8 @@ cifs_readv_callback(struct mid_q_entry *mid)
 					 rc);
 		}
 		/* FIXME: should this be counted toward the initiating task? */
-		task_io_account_read(rdata->bytes);
-		cifs_stats_bytes_read(tcon, rdata->bytes);
+		task_io_account_read(rdata->got_bytes);
+		cifs_stats_bytes_read(tcon, rdata->got_bytes);
 		break;
 	case MID_REQUEST_SUBMITTED:
 	case MID_RETRY_NEEDED:

fs/cifs/file.c

@@ -2840,7 +2840,7 @@ cifs_uncached_readdata_release(struct kref *refcount)
 static int
 cifs_readdata_to_iov(struct cifs_readdata *rdata, struct iov_iter *iter)
 {
-	size_t remaining = rdata->bytes;
+	size_t remaining = rdata->got_bytes;
 	unsigned int i;
 
 	for (i = 0; i < rdata->nr_pages; i++) {

fs/cifs/smb2pdu.c

@@ -1723,8 +1723,8 @@ smb2_readv_callback(struct mid_q_entry *mid)
 					 rc);
 		}
 		/* FIXME: should this be counted toward the initiating task? */
-		task_io_account_read(rdata->bytes);
-		cifs_stats_bytes_read(tcon, rdata->bytes);
+		task_io_account_read(rdata->got_bytes);
+		cifs_stats_bytes_read(tcon, rdata->got_bytes);
 		break;
 	case MID_REQUEST_SUBMITTED:
 	case MID_RETRY_NEEDED: