diff options
| author | FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> | 2008-12-18 14:49:40 +0900 |
|---|---|---|
| committer | James Bottomley <James.Bottomley@HansenPartnership.com> | 2009-01-02 11:54:23 -0600 |
| commit | d0e1ae31be226e83cdd0684625bf1535518ee0d3 (patch) | |
| tree | 622c951efedb4c0e515202c0e0f2d34ae3aa4244 | |
| parent | 9c905966c4d8c03ea21d230b277b7ea1e492f3c9 (diff) | |
[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>
| -rw-r--r-- | drivers/scsi/st.c | 11 | ||||
| -rw-r--r-- | drivers/scsi/st.h | 2 |
2 files changed, 13 insertions, 0 deletions
diff --git a/drivers/scsi/st.c b/drivers/scsi/st.c index 3984cd82fe1..9d9e4b90f23 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 b92712f9593..74748abe824 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 */ |