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-rw-r--r--drivers/block/rbd.c30
1 files changed, 25 insertions, 5 deletions
diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index 9717e20f3477..4edcb6d85f01 100644
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -2682,14 +2682,36 @@ static void rbd_img_parent_read_callback(struct rbd_img_request *img_request)
struct rbd_obj_request *obj_request;
struct rbd_device *rbd_dev;
u64 obj_end;
+ u64 img_xferred;
+ int img_result;
rbd_assert(img_request_child_test(img_request));
+ /* First get what we need from the image request and release it */
+
obj_request = img_request->obj_request;
+ img_xferred = img_request->xferred;
+ img_result = img_request->result;
+ rbd_img_request_put(img_request);
+
+ /*
+ * If the overlap has become 0 (most likely because the
+ * image has been flattened) we need to re-submit the
+ * original request.
+ */
rbd_assert(obj_request);
rbd_assert(obj_request->img_request);
+ rbd_dev = obj_request->img_request->rbd_dev;
+ if (!rbd_dev->parent_overlap) {
+ struct ceph_osd_client *osdc;
+
+ osdc = &rbd_dev->rbd_client->client->osdc;
+ img_result = rbd_obj_request_submit(osdc, obj_request);
+ if (!img_result)
+ return;
+ }
- obj_request->result = img_request->result;
+ obj_request->result = img_result;
if (obj_request->result)
goto out;
@@ -2702,7 +2724,6 @@ static void rbd_img_parent_read_callback(struct rbd_img_request *img_request)
*/
rbd_assert(obj_request->img_offset < U64_MAX - obj_request->length);
obj_end = obj_request->img_offset + obj_request->length;
- rbd_dev = obj_request->img_request->rbd_dev;
if (obj_end > rbd_dev->parent_overlap) {
u64 xferred = 0;
@@ -2710,12 +2731,11 @@ static void rbd_img_parent_read_callback(struct rbd_img_request *img_request)
xferred = rbd_dev->parent_overlap -
obj_request->img_offset;
- obj_request->xferred = min(img_request->xferred, xferred);
+ obj_request->xferred = min(img_xferred, xferred);
} else {
- obj_request->xferred = img_request->xferred;
+ obj_request->xferred = img_xferred;
}
out:
- rbd_img_request_put(img_request);
rbd_img_obj_request_read_callback(obj_request);
rbd_obj_request_complete(obj_request);
}
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