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Commit 08296618 authored by Alex Elder's avatar Alex Elder
Browse files

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: default avatarAlex Elder <elder@inktank.com>
Reviewed-by: default avatarJosh Durgin <josh.durgin@inktank.com>
parent 2b5fc648

drivers/block/rbd.c

+35 −1
Original line number Diff line number Diff line
@@ -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);