libceph: record length of bio list with bio (fdce58cc) · Commits · 戴 / test

When assigning a bio pointer to an osd request, we don't have an efficient way of knowing the total length bytes in the bio list. That information is available at the point it's set up by the rbd code, so record it with the osd data when it's set. This and the next patch are related to maintaining the length of a message's data independent of the message header, as described here: http://tracker.ceph.com/issues/4589 Signed-off-by:

Alex Elder <elder@inktank.com> Reviewed-by:

Josh Durgin <josh.durgin@inktank.com>

drivers/block/rbd.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -1352,6 +1352,7 @@ static struct ceph_osd_request *rbd_osd_req_create(
		rbd_assert(obj_request->bio_list != NULL);
		osd_data->type = CEPH_OSD_DATA_TYPE_BIO;
		osd_data->bio = obj_request->bio_list;
		osd_data->bio_length = obj_request->length;
		break;
		case OBJ_REQUEST_PAGES:
		osd_data->type = CEPH_OSD_DATA_TYPE_PAGES;

include/linux/ceph/osd_client.h

+4 −1

Original line number	Diff line number	Diff line
		@@ -71,7 +71,10 @@ struct ceph_osd_data {
		};
		struct ceph_pagelist *pagelist;
		#ifdef CONFIG_BLOCK
		struct bio *bio;
		struct {
		struct bio bio; / list of bios */
		size_t bio_length; /* total in list */
		};
		#endif /* CONFIG_BLOCK */
		};
		};

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