libceph: add support for CEPH_OSD_OP_SETALLOCHINT osd op

This is primarily for rbd's benefit and is supposed to combat
fragmentation:

"... knowing that rbd images have a 4m size, librbd can pass a hint
that will let the osd do the xfs allocation size ioctl on new files so
that they are allocated in 1m or 4m chunks.  We've seen cases where
users with rbd workloads have very high levels of fragmentation in xfs
and this would mitigate that and probably have a pretty nice
performance benefit."

SETALLOCHINT is considered advisory, so our backwards compatibility
mechanism here is to set FAILOK flag for all SETALLOCHINT ops.

Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com>
Reviewed-by: Sage Weil <sage@inktank.com>
Reviewed-by: Alex Elder <elder@linaro.org>

1 files changed, 27 insertions, 0 deletions

diff --git a/net/ceph/osd_client.c b/net/ceph/osd_client.c
index 5d7fd0b8c1c8..71830d79b0f4 100644
--- a/net/ceph/osd_client.c
+++ b/net/ceph/osd_client.c
@@ -436,6 +436,7 @@ static bool osd_req_opcode_valid(u16 opcode)
         case CEPH_OSD_OP_OMAPCLEAR:
         case CEPH_OSD_OP_OMAPRMKEYS:
         case CEPH_OSD_OP_OMAP_CMP:
+        case CEPH_OSD_OP_SETALLOCHINT:
         case CEPH_OSD_OP_CLONERANGE:
         case CEPH_OSD_OP_ASSERT_SRC_VERSION:
         case CEPH_OSD_OP_SRC_CMPXATTR:
@@ -591,6 +592,26 @@ void osd_req_op_watch_init(struct ceph_osd_request *osd_req,
 }
 EXPORT_SYMBOL(osd_req_op_watch_init);
 
+void osd_req_op_alloc_hint_init(struct ceph_osd_request *osd_req,
+                                unsigned int which,
+                                u64 expected_object_size,
+                                u64 expected_write_size)
+{
+        struct ceph_osd_req_op *op = _osd_req_op_init(osd_req, which,
+                                                      CEPH_OSD_OP_SETALLOCHINT);
+
+        op->alloc_hint.expected_object_size = expected_object_size;
+        op->alloc_hint.expected_write_size = expected_write_size;
+
+        /*
+         * CEPH_OSD_OP_SETALLOCHINT op is advisory and therefore deemed
+         * not worth a feature bit.  Set FAILOK per-op flag to make
+         * sure older osds don't trip over an unsupported opcode.
+         */
+        op->flags |= CEPH_OSD_OP_FLAG_FAILOK;
+}
+EXPORT_SYMBOL(osd_req_op_alloc_hint_init);
+
 static void ceph_osdc_msg_data_add(struct ceph_msg *msg,
                                 struct ceph_osd_data *osd_data)
 {
@@ -681,6 +702,12 @@ static u64 osd_req_encode_op(struct ceph_osd_request *req,
                 dst->watch.ver = cpu_to_le64(src->watch.ver);
                 dst->watch.flag = src->watch.flag;
                 break;
+        case CEPH_OSD_OP_SETALLOCHINT:
+                dst->alloc_hint.expected_object_size =
+                    cpu_to_le64(src->alloc_hint.expected_object_size);
+                dst->alloc_hint.expected_write_size =
+                    cpu_to_le64(src->alloc_hint.expected_write_size);
+                break;
         default:
                 pr_err("unsupported osd opcode %s\n",
                         ceph_osd_op_name(src->op));