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authorFUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>2008-12-18 14:49:40 +0900
committerJames Bottomley <James.Bottomley@HansenPartnership.com>2009-01-02 11:54:23 -0600
commitd0e1ae31be226e83cdd0684625bf1535518ee0d3 (patch)
tree622c951efedb4c0e515202c0e0f2d34ae3aa4244 /drivers/scsi/st.c
parent9c905966c4d8c03ea21d230b277b7ea1e492f3c9 (diff)
downloadlinux-d0e1ae31be226e83cdd0684625bf1535518ee0d3.tar.bz2
[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>
Diffstat (limited to 'drivers/scsi/st.c')
-rw-r--r--drivers/scsi/st.c11
1 files changed, 11 insertions, 0 deletions
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);
}