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rbd: support reading parent page data 

Currently, rbd_img_parent_read() assumes the incoming object request
contains bio data.  But if a layered image is part of a multi-layer
stack of images it will result in read requests of page data to parent
images.

Fortunately, it's not hard to add support for page data.

This resolves:
    http://tracker.ceph.com/issues/4939

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
This commit is contained in:
Alex Elder 2013-05-06 17:40:33 -05:00
parent 91c6febb38
commit 5b2ab72d36
1 changed files with 7 additions and 3 deletions
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10
drivers/block/rbd.c
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@ -2574,7 +2574,7 @@ static void rbd_img_parent_read(struct rbd_obj_request *obj_request)
rbd_assert(obj_request_img_data_test(obj_request));
rbd_assert(obj_request->img_request != NULL);
rbd_assert(obj_request->result == (s32) -ENOENT);
rbd_assert(obj_request->type == OBJ_REQUEST_BIO);
rbd_assert(obj_request_type_valid(obj_request->type));
rbd_dev = obj_request->img_request->rbd_dev;
rbd_assert(rbd_dev->parent != NULL);
@ -2590,8 +2590,12 @@ static void rbd_img_parent_read(struct rbd_obj_request *obj_request)
rbd_obj_request_get(obj_request);
img_request->obj_request = obj_request;
result = rbd_img_request_fill(img_request, OBJ_REQUEST_BIO,
obj_request->bio_list);
if (obj_request->type == OBJ_REQUEST_BIO)
result = rbd_img_request_fill(img_request, OBJ_REQUEST_BIO,
obj_request->bio_list);
else
result = rbd_img_request_fill(img_request, OBJ_REQUEST_PAGES,
obj_request->pages);
if (result)
goto out_err;