LU-1789 protocol: add support for lightweight connection

[fs/lustre-release.git] / lustre / ofd / ofd_trans.c

diff --git a/lustre/ofd/ofd_trans.c b/lustre/ofd/ofd_trans.c
index d9f26fe..cd238f3 100644 (file)
--- a/lustre/ofd/ofd_trans.c
+++ b/lustre/ofd/ofd_trans.c
@@ -115,12 +115,16 @@ static int ofd_last_rcvd_update(struct ofd_thread_info *info,
        __u64                           *transno_p;
        loff_t                           off;
        int                              err;
+       bool                             lw_client = false;
 
        ENTRY;
 
        LASSERT(ofd);
        LASSERT(info->fti_exp);
 
+       if ((info->fti_exp->exp_connect_flags & OBD_CONNECT_LIGHTWEIGHT) != 0)
+               lw_client = true;
+
        fed = &info->fti_exp->exp_filter_data;
        LASSERT(fed);
        lcd = fed->fed_ted.ted_lcd;
@@ -134,7 +138,7 @@ static int ofd_last_rcvd_update(struct ofd_thread_info *info,
        }
        /* ofd connect may cause transaction before export has last_rcvd
         * slot */
-       if (fed->fed_ted.ted_lr_idx < 0)
+       if (fed->fed_ted.ted_lr_idx < 0 && !lw_client)
                RETURN(0);
        off = fed->fed_ted.ted_lr_off;
 
@@ -157,9 +161,30 @@ static int ofd_last_rcvd_update(struct ofd_thread_info *info,
        }
 
        *transno_p = info->fti_transno;
-       LASSERT(fed->fed_ted.ted_lr_off > 0);
-       err = lut_client_data_write(info->fti_env, &ofd->ofd_lut, lcd,
+       if (lw_client) {
+               /* Although lightweight (LW) connections have no slot in
+                * last_rcvd, we still want to maintain the in-memory
+                * lsd_client_data structure in order to properly handle reply
+                * reconstruction. */
+               struct lu_target        *tg =&ofd->ofd_lut;
+               bool                     update = false;
+
+               err = 0;
+               /* All operations performed by LW clients are synchronous and
+                * we store the committed transno in the last_rcvd header */
+               cfs_spin_lock(&tg->lut_translock);
+               if (info->fti_transno > tg->lut_lsd.lsd_last_transno) {
+                       tg->lut_lsd.lsd_last_transno = info->fti_transno;
+                       update = true;
+               }
+               cfs_spin_unlock(&tg->lut_translock);
+               if (update)
+                       err = lut_server_data_write(info->fti_env, tg, th);
+       } else {
+               LASSERT(fed->fed_ted.ted_lr_off > 0);
+               err = lut_client_data_write(info->fti_env, &ofd->ofd_lut, lcd,
                                    &off, th);
+       }
 
        RETURN(err);
 }