rbd: pull in ceph_calc_raw_layout()

This is the first in a series of patches aimed at eliminating
the use of ceph_calc_raw_layout() by rbd.

It simply pulls in a copy of that function and renames it
rbd_calc_raw_layout().

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>

1 files changed, 35 insertions, 1 deletions

diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index 7ce178fd6fe5..eee0d3649dcf 100644
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -1101,6 +1101,40 @@ static void rbd_layout_init(struct ceph_file_layout *layout, u64 pool_id)
         layout->fl_pg_pool = cpu_to_le32((u32) pool_id);
 }
 
+int rbd_calc_raw_layout(struct ceph_file_layout *layout,
+                        u64 off, u64 *plen, u64 *bno,
+                        struct ceph_osd_request *req,
+                        struct ceph_osd_req_op *op)
+{
+        u64 orig_len = *plen;
+        u64 objoff, objlen;    /* extent in object */
+        int r;
+
+        /* object extent? */
+        r = ceph_calc_file_object_mapping(layout, off, orig_len, bno,
+                                          &objoff, &objlen);
+        if (r < 0)
+                return r;
+        if (objlen < orig_len) {
+                *plen = objlen;
+                dout(" skipping last %llu, final file extent %llu~%llu\n",
+                     orig_len - *plen, off, *plen);
+        }
+
+        if (op->op == CEPH_OSD_OP_READ || op->op == CEPH_OSD_OP_WRITE) {
+                op->extent.offset = objoff;
+                op->extent.length = objlen;
+        }
+        req->r_num_pages = calc_pages_for(off, *plen);
+        req->r_page_alignment = off & ~PAGE_MASK;
+        if (op->op == CEPH_OSD_OP_WRITE)
+                op->payload_len = *plen;
+
+        dout("calc_layout bno=%llx %llu~%llu (%d pages)\n",
+             *bno, objoff, objlen, req->r_num_pages);
+        return 0;
+}
+
 /*
  * Send ceph osd request
  */
@@ -1167,7 +1201,7 @@ static int rbd_do_request(struct request *rq,
         osd_req->r_oid_len = strlen(osd_req->r_oid);
 
         rbd_layout_init(&osd_req->r_file_layout, rbd_dev->spec->pool_id);
-        ret = ceph_calc_raw_layout(&osd_req->r_file_layout,
+        ret = rbd_calc_raw_layout(&osd_req->r_file_layout,
                                 ofs, &len, &bno, osd_req, op);
         rbd_assert(ret == 0);