libceph: record length of bio list with bio

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>
This commit is contained in:
Alex Elder 2013-03-14 14:09:06 -05:00 committed by Sage Weil
parent ace6d3a96f
commit fdce58ccb5
2 changed files with 5 additions and 1 deletions

View File

@ -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;

View File

@ -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 */
};
};