libceph: allow STAT osd operations
Add support for CEPH_OSD_OP_STAT operations in the osd client
and in rbd.
This operation sends no data to the osd; everything required is
encoded in identity of the target object.
The result will be ENOENT if the object doesn't exist. If it does
exist and no other error occurs the server returns the size and last
modification time of the target object as output data (in little
endian format). The size is a 64 bit unsigned and the time is
ceph_timespec structure (two unsigned 32-bit integers, representing
a seconds and nanoseconds value).
This resolves:
http://tracker.ceph.com/issues/4007
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index ff9e925..09514d9 100644
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -1148,6 +1148,8 @@
if (opcode == CEPH_OSD_OP_WRITE)
op->payload_len = op->extent.length;
break;
+ case CEPH_OSD_OP_STAT:
+ break;
case CEPH_OSD_OP_CALL:
/* rbd_osd_req_op_create(CALL, class, method, data, datalen) */
op->cls.class_name = va_arg(args, char *);
@@ -1277,6 +1279,16 @@
obj_request_done_set(obj_request);
}
+/*
+ * For a simple stat call there's nothing to do. We'll do more if
+ * this is part of a write sequence for a layered image.
+ */
+static void rbd_osd_stat_callback(struct rbd_obj_request *obj_request,
+ struct ceph_osd_op *op)
+{
+ obj_request_done_set(obj_request);
+}
+
static void rbd_osd_req_callback(struct ceph_osd_request *osd_req,
struct ceph_msg *msg)
{
@@ -1307,6 +1319,9 @@
case CEPH_OSD_OP_WRITE:
rbd_osd_write_callback(obj_request, op);
break;
+ case CEPH_OSD_OP_STAT:
+ rbd_osd_stat_callback(obj_request, op);
+ break;
case CEPH_OSD_OP_CALL:
case CEPH_OSD_OP_NOTIFY_ACK:
case CEPH_OSD_OP_WATCH:
diff --git a/net/ceph/osd_client.c b/net/ceph/osd_client.c
index b58748e..39629b6 100644
--- a/net/ceph/osd_client.c
+++ b/net/ceph/osd_client.c
@@ -220,6 +220,8 @@
dst->op = cpu_to_le16(src->op);
switch (src->op) {
+ case CEPH_OSD_OP_STAT:
+ break;
case CEPH_OSD_OP_READ:
case CEPH_OSD_OP_WRITE:
dst->extent.offset =
@@ -255,7 +257,6 @@
pr_err("unrecognized osd opcode %d\n", dst->op);
WARN_ON(1);
break;
- case CEPH_OSD_OP_STAT:
case CEPH_OSD_OP_MAPEXT:
case CEPH_OSD_OP_MASKTRUNC:
case CEPH_OSD_OP_SPARSE_READ: