bsg_map_buffer

Name:bsg_map_buffer

Proto:static int bsg_map_buffer(struct bsg_buffer *buf, struct request *req)

Type:int

Parameter:

Type	Parameter	Name
struct bsg_buffer *	buf
struct request *	req

203

sz = sizeof(structscatterlist) * * Number of scatter-gather DMA addr+len pairs after * physical address coalescing is performed.

205

BUG_ON(!* Number of scatter-gather DMA addr+len pairs after * physical address coalescing is performed.)

207

sg_list = kzalloc - allocate memory. The memory is set to zero.*@size: how many bytes of memory are required.*@flags: the type of memory to allocate (see kmalloc).

208

If Not sg_list Then Return -ENOMEM

210

sg_init_table - Initialize SG table*@sgl: The SG table*@nents: Number of entries in table* Notes:* If this is part of a chained sg table, sg_mark_end() should be* used only on the last table part.

211

sg_cnt = map a request to scatterlist, return number of sg entries setup. Caller* must make sure sg can hold rq->nr_phys_segments entries

212

payload_len = blk_rq_bytes(req)

213

Return 0

**Caller**
Name	Describe
bsg_prepare_job	sg_prepare_job - create the bsg_job structure for the bsg request@dev: device that is being sent the bsg request@req: BSG request that needs a job structure

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