From d0e1ae31be226e83cdd0684625bf1535518ee0d3 Mon Sep 17 00:00:00 2001 From: FUJITA Tomonori Date: Thu, 18 Dec 2008 14:49:40 +0900 Subject: [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 Acked-by: Kai Makisara Signed-off-by: James Bottomley --- drivers/scsi/st.c | 11 +++++++++++ drivers/scsi/st.h | 2 ++ 2 files changed, 13 insertions(+) (limited to 'drivers') diff --git a/drivers/scsi/st.c b/drivers/scsi/st.c index 3984cd82fe10..9d9e4b90f23b 100644 --- a/drivers/scsi/st.c +++ b/drivers/scsi/st.c @@ -3723,6 +3723,12 @@ static struct st_buffer * 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 @@ static int enlarge_buffer(struct st_buffer * STbuffer, int new_size, int need_dm 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 @@ static void normalize_buffer(struct st_buffer * STbuffer) 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 @@ static void scsi_tape_release(struct kref *kref) 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 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 */ -- cgit v1.2.2