libceph: don't build request in ceph_osdc_new_request()

This patch moves the call to ceph_osdc_build_request() out of
ceph_osdc_new_request() and into its caller.

This is in order to defer formatting osd operation information into
the request message until just before request is started.

The only unusual (ab)user of ceph_osdc_build_request() is
ceph_writepages_start(), where the final length of write request may
change (downward) based on the current inode size or the oldest
snapshot context with dirty data for the inode.

The remaining callers don't change anything in the request after has
been built.

This means the ops array is now supplied by the caller.  It also
means there is no need to pass the mtime to ceph_osdc_new_request()
(it gets provided to ceph_osdc_build_request()).  And rather than
passing a do_sync flag, have the number of ops in the ops array
supplied imply adding a second STARTSYNC operation after the READ or
WRITE requested.

This and some of the patches that follow are related to having the
messenger (only) be responsible for filling the content 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>

1 files changed, 6 insertions, 6 deletions

diff --git a/include/linux/ceph/osd_client.h b/include/linux/ceph/osd_client.h
index fdda93ebbb4c..ffaf9076fdc4 100644
--- a/include/linux/ceph/osd_client.h
+++ b/include/linux/ceph/osd_client.h
@@ -243,12 +243,12 @@ extern void osd_req_op_watch_init(struct ceph_osd_req_op *op, u16 opcode,
 
 extern struct ceph_osd_request *ceph_osdc_alloc_request(struct ceph_osd_client *osdc,
                                                struct ceph_snap_context *snapc,
-                                               unsigned int num_op,
+                                               unsigned int num_ops,
                                                bool use_mempool,
                                                gfp_t gfp_flags);
 
 extern void ceph_osdc_build_request(struct ceph_osd_request *req, u64 off,
-                                    unsigned int num_op,
+                                    unsigned int num_ops,
                                     struct ceph_osd_req_op *src_ops,
                                     struct ceph_snap_context *snapc,
                                     u64 snap_id,
@@ -257,11 +257,11 @@ extern void ceph_osdc_build_request(struct ceph_osd_request *req, u64 off,
 extern struct ceph_osd_request *ceph_osdc_new_request(struct ceph_osd_client *,
                                       struct ceph_file_layout *layout,
                                       struct ceph_vino vino,
-                                      u64 offset, u64 *len, int op, int flags,
+                                      u64 offset, u64 *len,
+                                      int num_ops, struct ceph_osd_req_op *ops,
+                                      int opcode, int flags,
                                       struct ceph_snap_context *snapc,
-                                      int do_sync, u32 truncate_seq,
-                                      u64 truncate_size,
-                                      struct timespec *mtime,
+                                      u32 truncate_seq, u64 truncate_size,
                                       bool use_mempool);
 
 extern void ceph_osdc_set_request_linger(struct ceph_osd_client *osdc,