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>

2 files changed, 5 insertions, 1 deletions

diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index f04d45b6b563..e95a92e89330 100644
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -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;
diff --git a/include/linux/ceph/osd_client.h b/include/linux/ceph/osd_client.h
index 3b5ba31c2cbd..fdda93ebbb4c 100644
--- a/include/linux/ceph/osd_client.h
+++ b/include/linux/ceph/osd_client.h
@@ -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 */
         };
 };