fix mismerge in ll_rw_blk.c

7 files changed, 404 insertions, 108 deletions

diff --git a/drivers/block/ll_rw_blk.c b/drivers/block/ll_rw_blk.c
index 3c818544475e..0c7599563b65 100644
--- a/drivers/block/ll_rw_blk.c
+++ b/drivers/block/ll_rw_blk.c
@@ -284,6 +284,7 @@ static inline void rq_init(request_queue_t *q, struct request *rq)
         rq->special = NULL;
         rq->data_len = 0;
         rq->data = NULL;
+        rq->nr_phys_segments = 0;
         rq->sense = NULL;
         rq->end_io = NULL;
         rq->end_io_data = NULL;
@@ -2115,7 +2116,7 @@ EXPORT_SYMBOL(blk_insert_request);
 /**
  * blk_rq_map_user - map user data to a request, for REQ_BLOCK_PC usage
  * @q:          request queue where request should be inserted
- * @rw:         READ or WRITE data
+ * @rq:         request structure to fill
  * @ubuf:       the user buffer
  * @len:        length of user data
  *
@@ -2132,21 +2133,19 @@ EXPORT_SYMBOL(blk_insert_request);
  *    original bio must be passed back in to blk_rq_unmap_user() for proper
  *    unmapping.
  */
-struct request *blk_rq_map_user(request_queue_t *q, int rw, void __user *ubuf,
-                                unsigned int len)
+int blk_rq_map_user(request_queue_t *q, struct request *rq, void __user *ubuf,
+                    unsigned int len)
 {
         unsigned long uaddr;
-        struct request *rq;
         struct bio *bio;
+        int reading;
 
         if (len > (q->max_sectors << 9))
-                return ERR_PTR(-EINVAL);
-        if ((!len && ubuf) || (len && !ubuf))
-                return ERR_PTR(-EINVAL);
+                return -EINVAL;
+        if (!len || !ubuf)
+                return -EINVAL;
 
-        rq = blk_get_request(q, rw, __GFP_WAIT);
-        if (!rq)
-                return ERR_PTR(-ENOMEM);
+        reading = rq_data_dir(rq) == READ;
 
         /*
          * if alignment requirement is satisfied, map in user pages for
@@ -2154,9 +2153,9 @@ struct request *blk_rq_map_user(request_queue_t *q, int rw, void __user *ubuf,
          */
         uaddr = (unsigned long) ubuf;
         if (!(uaddr & queue_dma_alignment(q)) && !(len & queue_dma_alignment(q)))
-                bio = bio_map_user(q, NULL, uaddr, len, rw == READ);
+                bio = bio_map_user(q, NULL, uaddr, len, reading);
         else
-                bio = bio_copy_user(q, uaddr, len, rw == READ);
+                bio = bio_copy_user(q, uaddr, len, reading);
 
         if (!IS_ERR(bio)) {
                 rq->bio = rq->biotail = bio;
@@ -2164,28 +2163,70 @@ struct request *blk_rq_map_user(request_queue_t *q, int rw, void __user *ubuf,
 
                 rq->buffer = rq->data = NULL;
                 rq->data_len = len;
-                return rq;
+                return 0;
         }
 
         /*
          * bio is the err-ptr
          */
-        blk_put_request(rq);
-        return (struct request *) bio;
+        return PTR_ERR(bio);
 }
 
 EXPORT_SYMBOL(blk_rq_map_user);
 
 /**
+ * blk_rq_map_user_iov - map user data to a request, for REQ_BLOCK_PC usage
+ * @q:          request queue where request should be inserted
+ * @rq:         request to map data to
+ * @iov:        pointer to the iovec
+ * @iov_count:  number of elements in the iovec
+ *
+ * Description:
+ *    Data will be mapped directly for zero copy io, if possible. Otherwise
+ *    a kernel bounce buffer is used.
+ *
+ *    A matching blk_rq_unmap_user() must be issued at the end of io, while
+ *    still in process context.
+ *
+ *    Note: The mapped bio may need to be bounced through blk_queue_bounce()
+ *    before being submitted to the device, as pages mapped may be out of
+ *    reach. It's the callers responsibility to make sure this happens. The
+ *    original bio must be passed back in to blk_rq_unmap_user() for proper
+ *    unmapping.
+ */
+int blk_rq_map_user_iov(request_queue_t *q, struct request *rq,
+                        struct sg_iovec *iov, int iov_count)
+{
+        struct bio *bio;
+
+        if (!iov || iov_count <= 0)
+                return -EINVAL;
+
+        /* we don't allow misaligned data like bio_map_user() does.  If the
+         * user is using sg, they're expected to know the alignment constraints
+         * and respect them accordingly */
+        bio = bio_map_user_iov(q, NULL, iov, iov_count, rq_data_dir(rq)== READ);
+        if (IS_ERR(bio))
+                return PTR_ERR(bio);
+
+        rq->bio = rq->biotail = bio;
+        blk_rq_bio_prep(q, rq, bio);
+        rq->buffer = rq->data = NULL;
+        rq->data_len = bio->bi_size;
+        return 0;
+}
+
+EXPORT_SYMBOL(blk_rq_map_user_iov);
+
+/**
  * blk_rq_unmap_user - unmap a request with user data
- * @rq:         request to be unmapped
- * @bio:        bio for the request
+ * @bio:        bio to be unmapped
  * @ulen:       length of user buffer
  *
  * Description:
- *    Unmap a request previously mapped by blk_rq_map_user().
+ *    Unmap a bio previously mapped by blk_rq_map_user().
  */
-int blk_rq_unmap_user(struct request *rq, struct bio *bio, unsigned int ulen)
+int blk_rq_unmap_user(struct bio *bio, unsigned int ulen)
 {
         int ret = 0;
 
@@ -2196,31 +2237,89 @@ int blk_rq_unmap_user(struct request *rq, struct bio *bio, unsigned int ulen)
                         ret = bio_uncopy_user(bio);
         }
 
-        blk_put_request(rq);
-        return ret;
+        return 0;
 }
 
 EXPORT_SYMBOL(blk_rq_unmap_user);
 
 /**
+ * blk_rq_map_kern - map kernel data to a request, for REQ_BLOCK_PC usage
+ * @q:          request queue where request should be inserted
+ * @rq:         request to fill
+ * @kbuf:       the kernel buffer
+ * @len:        length of user data
+ * @gfp_mask:   memory allocation flags
+ */
+int blk_rq_map_kern(request_queue_t *q, struct request *rq, void *kbuf,
+                    unsigned int len, unsigned int gfp_mask)
+{
+        struct bio *bio;
+