[SCSI] st: add struct rq_map_data support

This adds struct rq_map_data and the array of pointers to store
fragment buffers to struct st_buffer.

This patch doesn't remove st_buf_fragment but the latter patch does.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Acked-by: Kai Makisara <Kai.Makisara@kolumbus.fi>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/scsi/st.h b/drivers/scsi/st.h
index b92712f95931..74748abe8246 100644
--- a/drivers/scsi/st.h
+++ b/drivers/scsi/st.h
@@ -44,6 +44,8 @@ struct st_buffer {
         int syscall_result;
         struct st_request *last_SRpnt;
         struct st_cmdstatus cmdstat;
+        struct page **reserved_pages;
+        struct rq_map_data map_data;
         unsigned char *b_data;
         unsigned short use_sg;  /* zero or max number of s/g segments for this adapter */
         unsigned short sg_segs;         /* number of segments in s/g list */