fat: split include/msdos_fs.h

[linux-2.6-omap-h63xx.git] / block / blk-map.c

diff --git a/block/blk-map.c b/block/blk-map.c
index 572140cda5ff75f8e7b25e0431bd78bcd2ed22c5..4849fa36161eb697b47b08efa27af085b58bed3c 100644 (file)
--- a/block/blk-map.c
+++ b/block/blk-map.c
@@ -42,7 +42,7 @@ static int __blk_rq_unmap_user(struct bio *bio)
 
 static int __blk_rq_map_user(struct request_queue *q, struct request *rq,
                             struct rq_map_data *map_data, void __user *ubuf,
-                            unsigned int len, gfp_t gfp_mask)
+                            unsigned int len, int null_mapped, gfp_t gfp_mask)
 {
        unsigned long uaddr;
        struct bio *bio, *orig_bio;
@@ -63,6 +63,9 @@ static int __blk_rq_map_user(struct request_queue *q, struct request *rq,
        if (IS_ERR(bio))
                return PTR_ERR(bio);
 
+       if (null_mapped)
+               bio->bi_flags |= (1 << BIO_NULL_MAPPED);
+
        orig_bio = bio;
        blk_queue_bounce(q, &bio);
 
@@ -111,12 +114,17 @@ int blk_rq_map_user(struct request_queue *q, struct request *rq,
 {
        unsigned long bytes_read = 0;
        struct bio *bio = NULL;
-       int ret;
+       int ret, null_mapped = 0;
 
        if (len > (q->max_hw_sectors << 9))
                return -EINVAL;
-       if (!len || !ubuf)
+       if (!len)
                return -EINVAL;
+       if (!ubuf) {
+               if (!map_data || rq_data_dir(rq) != READ)
+                       return -EINVAL;
+               null_mapped = 1;
+       }
 
        while (bytes_read != len) {
                unsigned long map_len, end, start;
@@ -135,7 +143,7 @@ int blk_rq_map_user(struct request_queue *q, struct request *rq,
                        map_len -= PAGE_SIZE;
 
                ret = __blk_rq_map_user(q, rq, map_data, ubuf, map_len,
-                                       gfp_mask);
+                                       null_mapped, gfp_mask);
                if (ret < 0)
                        goto unmap_rq;
                if (!bio)