1 files changed, 498 insertions, 140 deletions

diff --git a/net/ceph/osd_client.c b/net/ceph/osd_client.c
index 3e20a122ffa2..6b5dda1cb5df 100644
--- a/net/ceph/osd_client.c
+++ b/net/ceph/osd_client.c
@@ -22,10 +22,15 @@
 #define OSD_OPREPLY_FRONT_LEN   512
 
 static const struct ceph_connection_operations osd_con_ops;
-static int __kick_requests(struct ceph_osd_client *osdc,
-                          struct ceph_osd *kickosd);
 
-static void kick_requests(struct ceph_osd_client *osdc, struct ceph_osd *osd);
+static void send_queued(struct ceph_osd_client *osdc);
+static int __reset_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd);
+static void __register_request(struct ceph_osd_client *osdc,
+                               struct ceph_osd_request *req);
+static void __unregister_linger_request(struct ceph_osd_client *osdc,
+                                        struct ceph_osd_request *req);
+static int __send_request(struct ceph_osd_client *osdc,
+                          struct ceph_osd_request *req);
 
 static int op_needs_trail(int op)
 {
@@ -34,6 +39,7 @@ static int op_needs_trail(int op)
         case CEPH_OSD_OP_SETXATTR:
         case CEPH_OSD_OP_CMPXATTR:
         case CEPH_OSD_OP_CALL:
+        case CEPH_OSD_OP_NOTIFY:
                 return 1;
         default:
                 return 0;
@@ -209,6 +215,8 @@ struct ceph_osd_request *ceph_osdc_alloc_request(struct ceph_osd_client *osdc,
         init_completion(&req->r_completion);
         init_completion(&req->r_safe_completion);
         INIT_LIST_HEAD(&req->r_unsafe_item);
+        INIT_LIST_HEAD(&req->r_linger_item);
+        INIT_LIST_HEAD(&req->r_linger_osd);
         req->r_flags = flags;
 
         WARN_ON((flags & (CEPH_OSD_FLAG_READ|CEPH_OSD_FLAG_WRITE)) == 0);
@@ -315,6 +323,24 @@ static void osd_req_encode_op(struct ceph_osd_request *req,
                 break;
         case CEPH_OSD_OP_STARTSYNC:
                 break;
+        case CEPH_OSD_OP_NOTIFY:
+                {
+                        __le32 prot_ver = cpu_to_le32(src->watch.prot_ver);
+                        __le32 timeout = cpu_to_le32(src->watch.timeout);
+
+                        BUG_ON(!req->r_trail);
+
+                        ceph_pagelist_append(req->r_trail,
+                                                &prot_ver, sizeof(prot_ver));
+                        ceph_pagelist_append(req->r_trail,
+                                                &timeout, sizeof(timeout));
+                }
+        case CEPH_OSD_OP_NOTIFY_ACK:
+        case CEPH_OSD_OP_WATCH:
+                dst->watch.cookie = cpu_to_le64(src->watch.cookie);
+                dst->watch.ver = cpu_to_le64(src->watch.ver);
+                dst->watch.flag = src->watch.flag;
+                break;
         default:
                 pr_err("unrecognized osd opcode %d\n", dst->op);
                 WARN_ON(1);
@@ -444,8 +470,8 @@ struct ceph_osd_request *ceph_osdc_new_request(struct ceph_osd_client *osdc,
                                          snapc, ops,
                                          use_mempool,
                                          GFP_NOFS, NULL, NULL);
-        if (IS_ERR(req))
-                return req;
+        if (!req)
+                return NULL;
 
         /* calculate max write size */
         calc_layout(osdc, vino, layout, off, plen, req, ops);
@@ -529,6 +555,51 @@ __lookup_request_ge(struct ceph_osd_client *osdc,
         return NULL;
 }
 
+/*
+ * Resubmit requests pending on the given osd.
+ */
+static void __kick_osd_requests(struct ceph_osd_client *osdc,
+                                struct ceph_osd *osd)
+{
+        struct ceph_osd_request *req, *nreq;
+        int err;
+
+        dout("__kick_osd_requests osd%d\n", osd->o_osd);
+        err = __reset_osd(osdc, osd);
+        if (err == -EAGAIN)
+                return;
+
+        list_for_each_entry(req, &osd->o_requests, r_osd_item) {
+                list_move(&req->r_req_lru_item, &osdc->req_unsent);
+                dout("requeued %p tid %llu osd%d\n", req, req->r_tid,
+                     osd->o_osd);
+                if (!req->r_linger)
+                        req->r_flags |= CEPH_OSD_FLAG_RETRY;
+        }
+
+        list_for_each_entry_safe(req, nreq, &osd->o_linger_requests,
+                                 r_linger_osd) {
+                /*
+                 * reregister request prior to unregistering linger so
+                 * that r_osd is preserved.
+                 */
+                BUG_ON(!list_empty(&req->r_req_lru_item));
+                __register_request(osdc, req);
+                list_add(&req->r_req_lru_item, &osdc->req_unsent);
+                list_add(&req->r_osd_item, &req->r_osd->o_requests);
+                __unregister_linger_request(osdc, req);
+                dout("requeued lingering %p tid %llu osd%d\n", req, req->r_tid,
+                     osd->o_osd);
+        }
+}
+
+static void kick_osd_requests(struct ceph_osd_client *osdc,
+                              struct ceph_osd *kickosd)
+{
+        mutex_lock(&osdc->request_mutex);
+        __kick_osd_requests(osdc, kickosd);
+        mutex_unlock(&osdc->request_mutex);
+}
 
 /*
  * If the osd connection drops, we need to resubmit all requests.
@@ -543,7 +614,8 @@ static void osd_reset(struct ceph_connection *con)
         dout("osd_reset osd%d\n", osd->o_osd);
         osdc = osd->o_osdc;
         down_read(&osdc->map_sem);
-        kick_requests(osdc, osd);
+        kick_osd_requests(osdc, osd);
+        send_queued(osdc);
         up_read(&osdc->map_sem);
 }
 
@@ -561,6 +633,7 @@ static struct ceph_osd *create_osd(struct ceph_osd_client *osdc)
         atomic_set(&osd->o_ref, 1);
         osd->o_osdc = osdc;
         INIT_LIST_HEAD(&osd->o_requests);
+        INIT_LIST_HEAD(&osd->o_linger_requests);
         INIT_LIST_HEAD(&osd->o_osd_lru);
         osd->o_incarnation = 1;
 
@@ -650,7 +723,8 @@ static int __reset_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd)
         int ret = 0;
 
         dout("__reset_osd %p osd%d\n", osd, osd->o_osd);
-        if (list_empty(&osd->o_requests)) {
+        if (list_empty(&osd->o_requests) &&
+            list_empty(&osd->o_linger_requests)) {
                 __remove_osd(osdc, osd);
         } else if (memcmp(&osdc->osdmap->osd_addr[osd->o_osd],
                           &osd->o_con.peer_addr,
@@ -723,15 +797,14 @@ static void __cancel_osd_timeout(struct ceph_osd_client *osdc)
  * Register request, assign tid.  If this is the first request, set up
  * the timeout event.
  */
-static void register_request(struct ceph_osd_client *osdc,
-                             struct ceph_osd_request *req)
+static void __register_request(struct ceph_osd_client *osdc,
+                               struct ceph_osd_request *req)
 {
-        mutex_lock(&osdc->request_mutex);
         req->r_tid = ++osdc->last_tid;
         req->r_request->hdr.tid = cpu_to_le64(req->r_tid);
         INIT_LIST_HEAD(&req->r_req_lru_item);
 
-        dout("register_request %p tid %lld\n", req, req->r_tid);
+        dout("__register_request %p tid %lld\n", req, req->r_tid);
         __insert_request(osdc, req);
         ceph_osdc_get_request(req);
         osdc->num_requests++;
@@ -740,6 +813,13 @@ static void register_request(struct ceph_osd_client *osdc,
                 dout(" first request, scheduling timeout\n");
                 __schedule_osd_timeout(osdc);
         }
+}
+
+static void register_request(struct ceph_osd_client *osdc,
+                             struct ceph_osd_request *req)
+{
+        mutex_lock(&osdc->request_mutex);
+        __register_request(osdc, req);
         mutex_unlock(&osdc->request_mutex);
 }
 
@@ -758,9 +838,13 @@ static void __unregister_request(struct ceph_osd_client *osdc,
                 ceph_con_revoke(&req->r_osd->o_con, req->r_request);
 
                 list_del_init(&req->r_osd_item);
-                if (list_empty(&req->r_osd->o_requests))
+                if (list_empty(&req->r_osd->o_requests) &&
+                    list_empty(&req->r_osd->o_linger_requests)) {
+                        dout("moving osd to %p lru\n", req->r_osd);
                         __move_osd_to_lru(osdc, req->r_osd);
-                req->r_osd = NULL;
+                }
+                if (list_empty(&req->r_linger_item))
+                        req->r_osd = NULL;
         }
 
         ceph_osdc_put_request(req);
@@ -781,20 +865,73 @@ static void __cancel_request(struct ceph_osd_request *req)
                 ceph_con_revoke(&req->r_osd->o_con, req->r_request);
                 req->r_sent = 0;
         }
-        list_del_init(&req->r_req_lru_item);
 }
 
+static void __register_linger_request(struct ceph_osd_client *osdc,
+                                    struct ceph_osd_request *req)
+{
+        dout("__register_linger_request %p\n", req);
+        list_add_tail(&req->r_linger_item, &osdc->req_linger);
+        list_add_tail(&req->r_linger_osd, &req->r_osd->o_linger_requests);
+}
+
+static void __unregister_linger_request(struct ceph_osd_client *osdc,
+                                        struct ceph_osd_request *req)
+{
+        dout("__unregister_linger_request %p\n", req);
+        if (req->r_osd) {
+                list_del_init(&req->r_linger_item);
+                list_del_init(&req->r_linger_osd);
+
+                if (list_empty(&req->r_osd->o_requests) &&
+                    list_empty(&req->r_osd->o_linger_requests)) {
+                        dout("moving osd to %p lru\n", req->r_osd);
+                        __move_osd_to_lru(osdc, req->r_osd);
+                }
+                if (list_empty(&req->r_osd_item))
+                        req->r_osd = NULL;
+        }
+}
+
+void ceph_osdc_unregister_linger_request(struct ceph_osd_client *osdc,
+                                         struct ceph_osd_request *req)
+{
+        mutex_lock(&osdc->request_mutex);
+        if (req->r_linger) {
+                __unregister_linger_request(osdc, req);
+                ceph_osdc_put_request(req);
+        }
+        mutex_unlock(&osdc->request_mutex);
+}
+EXPORT_SYMBOL(ceph_osdc_unregister_linger_request);
+
+void ceph_osdc_set_request_linger(struct ceph_osd_client *osdc,
+                                  struct ceph_osd_request *req)
+{
+        if (!req->r_linger) {
+                dout("set_request_linger %p\n", req);
+                req->r_linger = 1;
+                /*
+                 * caller is now responsible for calling
+                 * unregister_linger_request
+                 */
+                ceph_osdc_get_request(req);
+        }
+}
+EXPORT_SYMBOL(ceph_osdc_set_request_linger);
+
 /*
  * Pick an osd (the first 'up' osd in the pg), allocate the osd struct
  * (as needed), and set the request r_osd appropriately.  If there is
- * no up osd, set r_osd to NULL.
+ * no up osd, set r_osd to NULL.  Move the request to the appropriate list
+ * (unsent, homeless) or leave on in-flight lru.
  *
  * Return 0 if unchanged, 1 if changed, or negative on error.
  *
  * Caller should hold map_sem for read and request_mutex.
  */
-static int __map_osds(struct ceph_osd_client *osdc,
-                      struct ceph_osd_request *req)
+static int __map_request(struct ceph_osd_client *osdc,
+                         struct ceph_osd_request *req)
 {
         struct ceph_osd_request_head *reqhead = req->r_request->front.iov_base;
         struct ceph_pg pgid;
@@ -802,11 +939,13 @@ static int __map_osds(struct ceph_osd_client *osdc,
         int o = -1, num = 0;
         int err;
 
-        dout("map_osds %p tid %lld\n", req, req->r_tid);
+        dout("map_request %p tid %lld\n", req, req->r_tid);
         err = ceph_calc_object_layout(&reqhead->layout, req->r_oid,
                                       &req->r_file_layout, osdc->osdmap);
-        if (err)
+        if (err) {
+                list_move(&req->r_req_lru_item, &osdc->req_notarget);
                 return err;
+        }
         pgid = reqhead->layout.ol_pgid;
         req->r_pgid = pgid;
 
@@ -823,7 +962,7 @@ static int __map_osds(struct ceph_osd_client *osdc,
             (req->r_osd == NULL && o == -1))
                 return 0;  /* no change */
 
-        dout("map_osds tid %llu pgid %d.%x osd%d (was osd%d)\n",
+        dout("map_request tid %llu pgid %d.%x osd%d (was osd%d)\n",
              req->r_tid, le32_to_cpu(pgid.pool), le16_to_cpu(pgid.ps), o,
              req->r_osd ? req->r_osd->o_osd : -1);
 
@@ -841,10 +980,12 @@ static int __map_osds(struct ceph_osd_client *osdc,
         if (!req->r_osd && o >= 0) {
                 err = -ENOMEM;
                 req->r_osd = create_osd(osdc);
-                if (!req->r_osd)
+                if (!req->r_osd) {
+                        list_move(&req->r_req_lru_item, &osdc->req_notarget);
                         goto out;
+                }
 
-                dout("map_osds osd %p is osd%d\n", req->r_osd, o);
+                dout("map_request osd %p is osd%d\n", req->r_osd, o);
                 req->r_osd->o_osd = o;
                 req->r_osd->o_con.peer_name.num = cpu_to_le64(o);
                 __insert_osd(osdc, req->r_osd);
@@ -855,6 +996,9 @@ static int __map_osds(struct ceph_osd_client *osdc,
         if (req->r_osd) {
                 __remove_osd_from_lru(req->r_osd);
                 list_add(&req->r_osd_item, &req->r_osd->o_requests);
+                list_move(&req->r_req_lru_item, &osdc->req_unsent);
+        } else {
+                list_move(&req->r_req_lru_item, &osdc->req_notarget);
         }
         err = 1;   /* osd or pg changed */
 
@@ -869,16 +1013,6 @@ static int __send_request(struct ceph_osd_client *osdc,
                           struct ceph_osd_request *req)
 {
         struct ceph_osd_request_head *reqhead;
-        int err;
-
-        err = __map_osds(osdc, req);
-        if (err < 0)
-                return err;
-        if (req->r_osd == NULL) {
-                dout("send_request %p no up osds in pg\n", req);
-                ceph_monc_request_next_osdmap(&osdc->client->monc);
-                return 0;
-        }
 
         dout("send_request %p tid %llu to osd%d flags %d\n",
              req, req->r_tid, req->r_osd->o_osd, req->r_flags);
@@ -898,6 +1032,21 @@ static int __send_request(struct ceph_osd_client *osdc,
 }
 
 /*
+ * Send any requests in the queue (req_unsent).
+ */
+static void send_queued(struct ceph_osd_client *osdc)
+{
+        struct ceph_osd_request *req, *tmp;
+
+        dout("send_queued\n");
+        mutex_lock(&osdc->request_mutex);
+        list_for_each_entry_safe(req, tmp, &osdc->req_unsent, r_req_lru_item) {
+                __send_request(osdc, req);
+        }
+        mutex_unlock(&osdc->request_mutex);
+}
+
+/*
  * Timeout callback, called every N seconds when 1 or more osd
  * requests has been active for more than N seconds.  When this
  * happens, we ping all OSDs with requests who have timed out to
@@ -916,30 +1065,13 @@ static void handle_timeout(struct work_struct *work)
         unsigned long keepalive =
                 osdc->client->options->osd_keepalive_timeout * HZ;
         unsigned long last_stamp = 0;
-        struct rb_node *p;
         struct list_head slow_osds;
-
         dout("timeout\n");
         down_read(&osdc->map_sem);
 
         ceph_monc_request_next_osdmap(&osdc->client->monc);
 
         mutex_lock(&osdc->request_mutex);
-        for (p = rb_first(&osdc->requests); p; p = rb_next(p)) {
-                req = rb_entry(p, struct ceph_osd_request, r_node);
-
-                if (req->r_resend) {
-                        int err;
-
-                        dout("osdc resending prev failed %lld\n", req->r_tid);
-                        err = __send_request(osdc, req);
-                        if (err)
-                                dout("osdc failed again on %lld\n", req->r_tid);
-                        else
-                                req->r_resend = false;
-                        continue;
-                }
-        }
 
         /*
          * reset osds that appear to be _really_ unresponsive.  this
@@ -963,7 +1095,7 @@ static void handle_timeout(struct work_struct *work)
                 BUG_ON(!osd);
                 pr_warning(" tid %llu timed out on osd%d, will reset osd\n",
                            req->r_tid, osd->o_osd);
-                __kick_requests(osdc, osd);
+                __kick_osd_requests(osdc, osd);
         }
 
         /*
@@ -991,7 +1123,7 @@ static void handle_timeout(struct work_struct *work)
 
         __schedule_osd_timeout(osdc);
         mutex_unlock(&osdc->request_mutex);
-
+        send_queued(osdc);
         up_read(&osdc->map_sem);
 }
 
@@ -1035,7 +1167,6 @@ static void handle_reply(struct ceph_osd_client *osdc, struct ceph_msg *msg,
             numops * sizeof(struct ceph_osd_op))
                 goto bad;
         dout("handle_reply %p tid %llu result %d\n", msg, tid, (int)result);
-
         /* lookup */
         mutex_lock(&osdc->request_mutex);
         req = __lookup_request(osdc, tid);
@@ -1079,6 +1210,9 @@ static void handle_reply(struct ceph_osd_client *osdc, struct ceph_msg *msg,
 
         dout("handle_reply tid %llu flags %d\n", tid, flags);
 
+        if (req->r_linger && (flags & CEPH_OSD_FLAG_ONDISK))
+                __register_linger_request(osdc, req);
+
         /* either this is a read, or we got the safe response */
         if (result < 0 ||
             (flags & CEPH_OSD_FLAG_ONDISK) ||
@@ -1099,6 +1233,7 @@ static void handle_reply(struct ceph_osd_client *osdc, struct ceph_msg *msg,
         }
 
 done:
+        dout("req=%p req->r_linger=%d\n", req, req->r_linger);
         ceph_osdc_put_request(req);
         return;
 
@@ -1109,108 +1244,83 @@ bad:
         ceph_msg_dump(msg);
 }
 
-
-static int __kick_requests(struct ceph_osd_client *osdc,
-                          struct ceph_osd *kickosd)
+static void reset_changed_osds(struct ceph_osd_client *osdc)
 {
-        struct ceph_osd_request *req;
         struct rb_node *p, *n;
-        int needmap = 0;
-        int err;
 
-        dout("kick_requests osd%d\n", kickosd ? kickosd->o_osd : -1);
-        if (kickosd) {
-                err = __reset_osd(osdc, kickosd);
-                if (err == -EAGAIN)
-                        return 1;
-        } else {
-                for (p = rb_first(&osdc->osds); p; p = n) {
-                        struct ceph_osd *osd =
-                                rb_entry(p, struct ceph_osd, o_node);
-
-                        n = rb_next(p);
-                        if (!ceph_osd_is_up(osdc->osdmap, osd->o_osd) ||
-                            memcmp(&osd->o_con.peer_addr,
-                                   ceph_osd_addr(osdc->osdmap,
-                                                 osd->o_osd),
-                                   sizeof(struct ceph_entity_addr)) != 0)
-                                __reset_osd(osdc, osd);
-                }
+        for (p = rb_first(&osdc->osds); p; p = n) {
+                struct ceph_osd *osd = rb_entry(p, struct ceph_osd, o_node);
+
+                n = rb_next(p);
+                if (!ceph_osd_is_up(osdc->osdmap, osd->o_osd) ||
+                    memcmp(&osd->o_con.peer_addr,
+                           ceph_osd_addr(osdc->osdmap,
+                                         osd->o_osd),
+                           sizeof(struct ceph_entity_addr)) != 0)
+                        __reset_osd(osdc, osd);
         }
+}
+
+/*
+ * Requeue requests whose mapping to an OSD has changed.  If requests map to
+ * no osd, request a new map.
+ *
+ * Caller should hold map_sem for read and request_mutex.
+ */
+static void kick_requests(struct ceph_osd_client *osdc)
+{
+        struct ceph_osd_request *req, *nreq;
+        struct rb_node *p;
+        int needmap = 0;
+        int err;
 
+        dout("kick_requests\n");
+        mutex_lock(&osdc->request_mutex);
         for (p = rb_first(&osdc->requests); p; p = rb_next(p)) {
                 req = rb_entry(p, struct ceph_osd_request, r_node);
-
-                if (req->r_resend) {
-                        dout(" r_resend set on tid %llu\n", req->r_tid);
-                        __cancel_request(req);
-                        goto kick;
-                }
-                if (req->r_osd && kickosd == req->r_osd) {
-                        __cancel_request(req);
-                        goto kick;
+                err = __map_request(osdc, req);
+                if (err < 0)
+                        continue;  /* error */
+                if (req->r_osd == NULL) {
+                        dout("%p tid %llu maps to no osd\n", req, req->r_tid);
+                        needmap++;  /* request a newer map */
+                } else if (err > 0) {
+                        dout("%p tid %llu requeued on osd%d\n", req, req->r_tid,
+                             req->r_osd ? req->r_osd->o_osd : -1);
+                        if (!req->r_linger)
+                                req->r_flags |= CEPH_OSD_FLAG_RETRY;
                 }
+        }
 
-                err = __map_osds(osdc, req);
+        list_for_each_entry_safe(req, nreq, &osdc->req_linger,
+                                 r_linger_item) {
+                dout("linger req=%p req->r_osd=%p\n", req, req->r_osd);
+
+                err = __map_request(osdc, req);
                 if (err == 0)
-                        continue;  /* no change */
-                if (err < 0) {
-                        /*
-                         * FIXME: really, we should set the request
-                         * error and fail if this isn't a 'nofail'
-                         * request, but that's a fair bit more
-                         * complicated to do.  So retry!
-                         */
-                        dout(" setting r_resend on %llu\n", req->r_tid);
-                        req->r_resend = true;
-                        continue;
-                }
+                        continue;  /* no change and no osd was specified */
+                if (err < 0)
+                        continue;  /* hrm! */
                 if (req->r_osd == NULL) {
                         dout("tid %llu maps to no valid osd\n", req->r_tid);
                         needmap++;  /* request a newer map */
                         continue;
                 }
 
-kick:
-                dout("kicking %p tid %llu osd%d\n", req, req->r_tid,
+                dout("kicking lingering %p tid %llu osd%d\n", req, req->r_tid,
                      req->r_osd ? req->r_osd->o_osd : -1);
-                req->r_flags |= CEPH_OSD_FLAG_RETRY;
-                err = __send_request(osdc, req);
-                if (err) {
-                        dout(" setting r_resend on %llu\n", req->r_tid);
-                        req->r_resend = true;
-                }
+                __unregister_linger_request(osdc, req);
+                __register_request(osdc, req);
         }
-
-        return needmap;
-}
-
-/*
- * Resubmit osd requests whose osd or osd address has changed.  Request
- * a new osd map if osds are down, or we are otherwise unable to determine
- * how to direct a request.
- *
- * Close connections to down osds.
- *
- * If @who is specified, resubmit requests for that specific osd.
- *
- * Caller should hold map_sem for read and request_mutex.
- */
-static void kick_requests(struct ceph_osd_client *osdc,
-                          struct ceph_osd *kickosd)
-{
-        int needmap;
-
-        mutex_lock(&osdc->request_mutex);
-        needmap = __kick_requests(osdc, kickosd);
         mutex_unlock(&osdc->request_mutex);
 
         if (needmap) {
                 dout("%d requests for down osds, need new map\n", needmap);
                 ceph_monc_request_next_osdmap(&osdc->client->monc);
         }
-
 }
+
+
 /*
  * Process updated osd map.
  *
@@ -1263,6 +1373,8 @@ void ceph_osdc_handle_map(struct ceph_osd_client *osdc, struct ceph_msg *msg)
                                 ceph_osdmap_destroy(osdc->osdmap);
                                 osdc->osdmap = newmap;
                         }
+                        kick_requests(osdc);
+                        reset_changed_osds(osdc);
                 } else {
                         dout("ignoring incremental map %u len %d\n",
                              epoch, maplen);
@@ -1300,6 +1412,7 @@ void ceph_osdc_handle_map(struct ceph_osd_client *osdc, struct ceph_msg *msg)
                         osdc->osdmap = newmap;
                         if (oldmap)
                                 ceph_osdmap_destroy(oldmap);
+                        kick_requests(osdc);
                 }
                 p += maplen;
                 nr_maps--;
@@ -1308,8 +1421,7 @@ void ceph_osdc_handle_map(struct ceph_osd_client *osdc, struct ceph_msg *msg)
 done:
         downgrade_write(&osdc->map_sem);
         ceph_monc_got_osdmap(&osdc->client->monc, osdc->osdmap->epoch);
-        if (newmap)
-                kick_requests(osdc, NULL);
+        send_queued(osdc);
         up_read(&osdc->map_sem);
         wake_up_all(&osdc->client->auth_wq);
         return;
@@ -1322,6 +1434,223 @@ bad:
 }
 
 /*
+ * watch/notify callback event infrastructure
+ *
+ * These callbacks are used both for watch and notify operations.
+ */
+static void __release_event(struct kref *kref)
+{
+        struct ceph_osd_event *event =
+                container_of(kref, struct ceph_osd_event, kref);
+
+        dout("__release_event %p\n", event);
+        kfree(event);
+}
+
+static void get_event(struct ceph_osd_event *event)
+{
+        kref_get(&event->kref);
+}
+
+void ceph_osdc_put_event(struct ceph_osd_event *event)
+{
+        kref_put(&event->kref, __release_event);
+}
+EXPORT_SYMBOL(ceph_osdc_put_event);
+
+static void __insert_event(struct ceph_osd_client *osdc,
+                             struct ceph_osd_event *new)
+{
+        struct rb_node **p = &osdc->event_tree.rb_node;
+        struct rb_node *parent = NULL;
+        struct ceph_osd_event *event = NULL;
+
+        while (*p) {
+                parent = *p;
+                event = rb_entry(parent, struct ceph_osd_event, node);
+                if (new->cookie < event->cookie)
+                        p = &(*p)->rb_left;
+                else if (new->cookie > event->cookie)
+                        p = &(*p)->rb_right;
+                else
+                        BUG();
+        }
+
+        rb_link_node(&new->node, parent, p);
+        rb_insert_color(&new->node, &osdc->event_tree);
+}
+
+static struct ceph_osd_event *__find_event(struct ceph_osd_client *osdc,
+                                                u64 cookie)
+{
+        struct rb_node **p = &osdc->event_tree.rb_node;
+        struct rb_node *parent = NULL;
+        struct ceph_osd_event *event = NULL;
+
+        while (*p) {
+                parent = *p;
+                event = rb_entry(parent, struct ceph_osd_event, node);
+                if (cookie < event->cookie)
+                        p = &(*p)->rb_left;
+                else if (cookie > event->cookie)
+                        p = &(*p)->rb_right;
+                else
+                        return event;
+        }
+        return NULL;
+}
+
+static void __remove_event(struct ceph_osd_event *event)
+{
+        struct ceph_osd_client *osdc = event->osdc;
+
+        if (!RB_EMPTY_NODE(&event->node)) {
+                dout("__remove_event removed %p\n", event);
+                rb_erase(&event->node, &osdc->event_tree);
+                ceph_osdc_put_event(event);
+        } else {
+                dout("__remove_event didn't remove %p\n", event);
+        }
+}
+
+int ceph_osdc_create_event(struct ceph_osd_client *osdc,
+                           void (*event_cb)(u64, u64, u8, void *),
+                           int one_shot, void *data,
+                           struct ceph_osd_event **pevent)
+{
+        struct ceph_osd_event *event;
+
+        event = kmalloc(sizeof(*event), GFP_NOIO);
+        if (!event)
+                return -ENOMEM;
+
+        dout("create_event %p\n", event);
+        event->cb = event_cb;
+        event->one_shot = one_shot;
+        event->data = data;
+        event->osdc = osdc;
+        INIT_LIST_HEAD(&event->osd_node);
+        kref_init(&event->kref);   /* one ref for us */
+        kref_get(&event->kref);    /* one ref for the caller */
+        init_completion(&event->completion);
+
+        spin_lock(&osdc->event_lock);
+        event->cookie = ++osdc->event_count;
+        __insert_event(osdc, event);
+        spin_unlock(&osdc->event_lock);
+
+        *pevent = event;
+        return 0;
+}
+EXPORT_SYMBOL(ceph_osdc_create_event);
+
+void ceph_osdc_cancel_event(struct ceph_osd_event *event)
+{
+        struct ceph_osd_client *osdc = event->osdc;
+
+        dout("cancel_event %p\n", event);
+        spin_lock(&osdc->event_lock);
+        __remove_event(event);
+        spin_unlock(&osdc->event_lock);
+        ceph_osdc_put_event(event); /* caller's */
+}
+EXPORT_SYMBOL(ceph_osdc_cancel_event);
+
+
+static void do_event_work(struct work_struct *work)
+{
+        struct ceph_osd_event_work *event_work =
+                container_of(work, struct ceph_osd_event_work, work);
+        struct ceph_osd_event *event = event_work->event;
+        u64 ver = event_work->ver;
+        u64 notify_id = event_work->notify_id;
+        u8 opcode = event_work->opcode;
+
+        dout("do_event_work completing %p\n", event);
+        event->cb(ver, notify_id, opcode, event->data);
+        complete(&event->completion);
+        dout("do_event_work completed %p\n", event);
+        ceph_osdc_put_event(event);
+        kfree(event_work);
+}
+
+
+/*
+ * Process osd watch notifications
+ */
+void handle_watch_notify(struct ceph_osd_client *osdc, struct ceph_msg *msg)
+{
+        void *p, *end;
+        u8 proto_ver;
+        u64 cookie, ver, notify_id;
+        u8 opcode;
+        struct ceph_osd_event *event;
+        struct ceph_osd_event_work *event_work;
+
+        p = msg->front.iov_base;
+        end = p + msg->front.iov_len;
+
+        ceph_decode_8_safe(&p, end, proto_ver, bad);
+        ceph_decode_8_safe(&p, end, opcode, bad);
+        ceph_decode_64_safe(&p, end, cookie, bad);
+        ceph_decode_64_safe(&p, end, ver, bad);
+        ceph_decode_64_safe(&p, end, notify_id, bad);
+
+        spin_lock(&osdc->event_lock);
+        event = __find_event(osdc, cookie);
+        if (event) {
+                get_event(event);
+                if (event->one_shot)
+                        __remove_event(event);
+        }
+        spin_unlock(&osdc->event_lock);
+        dout("handle_watch_notify cookie %lld ver %lld event %p\n",
+             cookie, ver, event);
+        if (event) {
+                event_work = kmalloc(sizeof(*event_work), GFP_NOIO);
+                if (!event_work) {
+                        dout("ERROR: could not allocate event_work\n");
+                        goto done_err;
+                }
+                INIT_WORK(&event_work->work, do_event_work);
+                event_work->event = event;
+                event_work->ver = ver;
+                event_work->notify_id = notify_id;
+                event_work->opcode = opcode;
+                if (!queue_work(osdc->notify_wq, &event_work->work)) {
+                        dout("WARNING: failed to queue notify event work\n");
+                        goto done_err;
+                }
+        }
+
+        return;
+
+done_err:
+        complete(&event->completion);
+        ceph_osdc_put_event(event);
+        return;
+
+bad:
+        pr_err("osdc handle_watch_notify corrupt msg\n");
+        return;
+}
+
+int ceph_osdc_wait_event(struct ceph_osd_event *event, unsigned long timeout)
+{
+        int err;
+
+        dout("wait_event %p\n", event);
+        err = wait_for_completion_interruptible_timeout(&event->completion,
+                                                        timeout * HZ);
+        ceph_osdc_put_event(event);
+        if (err > 0)
+                err = 0;
+        dout("wait_event %p returns %d\n", event, err);
+        return err;
+}
+EXPORT_SYMBOL(ceph_osdc_wait_event);
+
+/*
  * Register request, send initial attempt.
  */
 int ceph_osdc_start_request(struct ceph_osd_client *osdc,
@@ -1347,18 +1676,27 @@ int ceph_osdc_start_request(struct ceph_osd_client *osdc,
          * the request still han't been touched yet.
          */
         if (req->r_sent == 0) {
-                rc = __send_request(osdc, req);
-                if (rc) {
-                        if (nofail) {
-                                dout("osdc_start_request failed send, "
-                                     " marking %lld\n", req->r_tid);
-                                req->r_resend = true;
-                                rc = 0;
-                        } else {
-                                __unregister_request(osdc, req);
+                rc = __map_request(osdc, req);
+                if (rc < 0)
+                        goto out_unlock;
+                if (req->r_osd == NULL) {
+                        dout("send_request %p no up osds in pg\n", req);
+                        ceph_monc_request_next_osdmap(&osdc->client->monc);
+                } else {
+                        rc = __send_request(osdc, req);
+                        if (rc) {
+                                if (nofail) {
+                                        dout("osdc_start_request failed send, "
+                                             " will retry %lld\n", req->r_tid);
+                                        rc = 0;
+                                } else {
+                                        __unregister_request(osdc, req);
+                                }
                         }
                 }
         }
+
+out_unlock:
         mutex_unlock(&osdc->request_mutex);
         up_read(&osdc->map_sem);
         return rc;
@@ -1441,9 +1779,15 @@ int ceph_osdc_init(struct ceph_osd_client *osdc, struct ceph_client *client)
         INIT_LIST_HEAD(&osdc->osd_lru);
         osdc->requests = RB_ROOT;
         INIT_LIST_HEAD(&osdc->req_lru);
+        INIT_LIST_HEAD(&osdc->req_unsent);
+        INIT_LIST_HEAD(&osdc->req_notarget);
+        INIT_LIST_HEAD(&osdc->req_linger);
         osdc->num_requests = 0;
         INIT_DELAYED_WORK(&osdc->timeout_work, handle_timeout);
         INIT_DELAYED_WORK(&osdc->osds_timeout_work, handle_osds_timeout);
+        spin_lock_init(&osdc->event_lock);
+        osdc->event_tree = RB_ROOT;
+        osdc->event_count = 0;
 
         schedule_delayed_work(&osdc->osds_timeout_work,
            round_jiffies_relative(osdc->client->options->osd_idle_ttl * HZ));
@@ -1463,6 +1807,13 @@ int ceph_osdc_init(struct ceph_osd_client *osdc, struct ceph_client *client)
                                 "osd_op_reply");
         if (err < 0)
                 goto out_msgpool;
+
+        osdc->notify_wq = create_singlethread_workqueue("ceph-watch-notify");
+        if (IS_ERR(osdc->notify_wq)) {
+                err = PTR_ERR(osdc->notify_wq);
+                osdc->notify_wq = NULL;
+                goto out_msgpool;
+        }
         return 0;
 
 out_msgpool:
@@ -1476,6 +1827,8 @@ EXPORT_SYMBOL(ceph_osdc_init);
 
 void ceph_osdc_stop(struct ceph_osd_client *osdc)
 {
+        flush_workqueue(osdc->notify_wq);
+        destroy_workqueue(osdc->notify_wq);
         cancel_delayed_work_sync(&osdc->timeout_work);
         cancel_delayed_work_sync(&osdc->osds_timeout_work);
         if (osdc->osdmap) {
@@ -1483,6 +1836,7 @@ void ceph_osdc_stop(struct ceph_osd_client *osdc)
                 osdc->osdmap = NULL;
         }
         remove_old_osds(osdc, 1);
+        WARN_ON(!RB_EMPTY_ROOT(&osdc->osds));
         mempool_destroy(osdc->req_mempool);
         ceph_msgpool_destroy(&osdc->msgpool_op);
         ceph_msgpool_destroy(&osdc->msgpool_op_reply);
@@ -1591,6 +1945,9 @@ static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
         case CEPH_MSG_OSD_OPREPLY:
                 handle_reply(osdc, msg, con);
                 break;
+        case CEPH_MSG_WATCH_NOTIFY:
+                handle_watch_notify(osdc, msg);
+                break;
 
         default:
                 pr_err("received unknown message type %d %s\n", type,
@@ -1684,6 +2041,7 @@ static struct ceph_msg *alloc_msg(struct ceph_connection *con,
 
         switch (type) {
         case CEPH_MSG_OSD_MAP:
+        case CEPH_MSG_WATCH_NOTIFY:
                 return ceph_msg_new(type, front, GFP_NOFS);
         case CEPH_MSG_OSD_OPREPLY:
                 return get_reply(con, hdr, skip);