---

yaml
---
r: 127880
b: refs/heads/master
c: 56c451f
h: refs/heads/master
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: e623ddb4e940b266adc77ba1cc28a3554aa90e79
+refs/heads/master: 56c451f4b583ccdf80c9e676179c9cb49de86745

trunk/block/blk-map.c

@@ -150,6 +150,9 @@ int blk_rq_map_user(struct request_queue *q, struct request *rq,
 			bio = rq->bio;
 		bytes_read += ret;
 		ubuf += ret;
+
+		if (map_data)
+			map_data->offset += ret;
 	}
 
 	if (!bio_flagged(bio, BIO_USER_MAPPED))

trunk/drivers/scsi/sg.c

@@ -1669,6 +1669,7 @@ static int sg_start_req(Sg_request *srp, unsigned char *cmd)
 		md->pages = req_schp->pages;
 		md->page_order = req_schp->page_order;
 		md->nr_entries = req_schp->k_use_sg;
+		md->offset = 0;
 	}
 
 	if (iov_count)

trunk/fs/bio.c

@@ -788,6 +788,7 @@ struct bio *bio_copy_user_iov(struct request_queue *q,
 	int i, ret;
 	int nr_pages = 0;
 	unsigned int len = 0;
+	unsigned int offset = map_data ? map_data->offset & ~PAGE_MASK : 0;
 
 	for (i = 0; i < iov_count; i++) {
 		unsigned long uaddr;
@@ -814,12 +815,16 @@ struct bio *bio_copy_user_iov(struct request_queue *q,
 	bio->bi_rw |= (!write_to_vm << BIO_RW);
 
 	ret = 0;
-	i = 0;
-	if (map_data)
+
+	if (map_data) {
 		nr_pages = 1 << map_data->page_order;
+		i = map_data->offset / PAGE_SIZE;
+	}
 	while (len) {
 		unsigned int bytes = PAGE_SIZE;
 
+		bytes -= offset;
+
 		if (bytes > len)
 			bytes = len;
 
@@ -841,10 +846,11 @@ struct bio *bio_copy_user_iov(struct request_queue *q,
 			}
 		}
 
-		if (bio_add_pc_page(q, bio, page, bytes, 0) < bytes)
+		if (bio_add_pc_page(q, bio, page, bytes, offset) < bytes)
 			break;
 
 		len -= bytes;
+		offset = 0;
 	}
 
 	if (ret)

trunk/include/linux/blkdev.h

@@ -690,6 +690,7 @@ struct rq_map_data {
 	struct page **pages;
 	int page_order;
 	int nr_entries;
+	unsigned long offset;
 };
 
 struct req_iterator {