[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>
diff --git a/drivers/scsi/st.c b/drivers/scsi/st.c
index 3984cd8..9d9e4b9 100644
--- a/drivers/scsi/st.c
+++ b/drivers/scsi/st.c
@@ -3723,6 +3723,12 @@
tb->buffer_size = got;
sg_init_table(tb->sg, max_sg);
+ tb->reserved_pages = kzalloc(max_sg * sizeof(struct page *), priority);
+ if (!tb->reserved_pages) {
+ kfree(tb);
+ return NULL;
+ }
+
return tb;
}
@@ -3771,9 +3777,11 @@
STbuffer->buffer_size = got;
if (STbuffer->cleared)
memset(page_address(STbuffer->frp[segs].page), 0, b_size);
+ STbuffer->reserved_pages[segs] = STbuffer->frp[segs].page;
segs++;
}
STbuffer->b_data = page_address(STbuffer->frp[0].page);
+ STbuffer->map_data.page_order = order;
return 1;
}
@@ -3803,6 +3811,8 @@
STbuffer->frp_segs = STbuffer->orig_frp_segs;
STbuffer->frp_sg_current = 0;
STbuffer->sg_segs = 0;
+ STbuffer->map_data.page_order = 0;
+ STbuffer->map_data.offset = 0;
}
@@ -4282,6 +4292,7 @@
if (tpnt->buffer) {
tpnt->buffer->orig_frp_segs = 0;
normalize_buffer(tpnt->buffer);
+ kfree(tpnt->buffer->reserved_pages);
kfree(tpnt->buffer);
}
diff --git a/drivers/scsi/st.h b/drivers/scsi/st.h
index b92712f..74748ab 100644
--- a/drivers/scsi/st.h
+++ b/drivers/scsi/st.h
@@ -44,6 +44,8 @@
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 */