// SPDX-License-Identifier: GPL-2.0 #include <linux/ceph/ceph_debug.h> #include <linux/module.h> #include <linux/types.h> #include <linux/slab.h> #include <linux/random.h> #include <linux/sched.h> #include <linux/ceph/ceph_features.h> #include <linux/ceph/mon_client.h> #include <linux/ceph/libceph.h> #include <linux/ceph/debugfs.h> #include <linux/ceph/decode.h> #include <linux/ceph/auth.h> /* * Interact with Ceph monitor cluster. Handle requests for new map * versions, and periodically resend as needed. Also implement * statfs() and umount(). * * A small cluster of Ceph "monitors" are responsible for managing critical * cluster configuration and state information. An odd number (e.g., 3, 5) * of cmon daemons use a modified version of the Paxos part-time parliament * algorithm to manage the MDS map (mds cluster membership), OSD map, and * list of clients who have mounted the file system. * * We maintain an open, active session with a monitor at all times in order to * receive timely MDSMap updates. We periodically send a keepalive byte on the * TCP socket to ensure we detect a failure. If the connection does break, we * randomly hunt for a new monitor. Once the connection is reestablished, we * resend any outstanding requests. */ static const struct ceph_connection_operations mon_con_ops; static int __validate_auth(struct ceph_mon_client *monc); static int decode_mon_info(void **p, void *end, bool msgr2, struct ceph_entity_addr *addr) { void *mon_info_end; u32 struct_len; u8 struct_v; int ret; ret = ceph_start_decoding(p, end, 1, "mon_info_t", &struct_v, &struct_len); if (ret) return ret; mon_info_end = *p + struct_len; ceph_decode_skip_string(p, end, e_inval); /* skip mon name */ ret = ceph_decode_entity_addrvec(p, end, msgr2, addr); if (ret) return ret; *p = mon_info_end; return 0; e_inval: return -EINVAL; } /* * Decode a monmap blob (e.g., during mount). * * Assume MonMap v3 (i.e. encoding with MONNAMES and MONENC). */ static struct ceph_monmap *ceph_monmap_decode(void **p, void *end, bool msgr2) { struct ceph_monmap *monmap = NULL; struct ceph_fsid fsid; u32 struct_len; int blob_len; int num_mon; u8 struct_v; u32 epoch; int ret; int i; ceph_decode_32_safe(p, end, blob_len, e_inval); ceph_decode_need(p, end, blob_len, e_inval); ret = ceph_start_decoding(p, end, 6, "monmap", &struct_v, &struct_len); if (ret) goto fail; dout("%s struct_v %d\n", __func__, struct_v); ceph_decode_copy_safe(p, end, &fsid, sizeof(fsid), e_inval); ceph_decode_32_safe(p, end, epoch, e_inval); if (struct_v >= 6) { u32 feat_struct_len; u8 feat_struct_v; *p += sizeof(struct ceph_timespec); /* skip last_changed */ *p += sizeof(struct ceph_timespec); /* skip created */ ret = ceph_start_decoding(p, end, 1, "mon_feature_t", &feat_struct_v, &feat_struct_len); if (ret) goto fail; *p += feat_struct_len; /* skip persistent_features */ ret = ceph_start_decoding(p, end, 1, "mon_feature_t", &feat_struct_v, &feat_struct_len); if (ret) goto fail; *p += feat_struct_len; /* skip optional_features */ } ceph_decode_32_safe(p, end, num_mon, e_inval); dout("%s fsid %pU epoch %u num_mon %d\n", __func__, &fsid, epoch, num_mon); if (num_mon > CEPH_MAX_MON) goto e_inval; monmap = kmalloc(struct_size(monmap, mon_inst, num_mon), GFP_NOIO); if (!monmap) { ret = -ENOMEM; goto fail; } monmap->fsid = fsid; monmap->epoch = epoch; monmap->num_mon = num_mon; /* legacy_mon_addr map or mon_info map */ for (i = 0; i < num_mon; i++) { struct ceph_entity_inst *inst = &monmap->mon_inst[i]; ceph_decode_skip_string(p, end, e_inval); /* skip mon name */ inst->name.type = CEPH_ENTITY_TYPE_MON; inst->name.num = cpu_to_le64(i); if (struct_v >= 6) ret = decode_mon_info(p, end, msgr2, &inst->addr); else ret = ceph_decode_entity_addr(p, end, &inst->addr); if (ret) goto fail; dout("%s mon%d addr %s\n", __func__, i, ceph_pr_addr(&inst->addr)); } return monmap; e_inval: ret = -EINVAL; fail: kfree(monmap); return ERR_PTR(ret); } /* * return true if *addr is included in the monmap. */ int ceph_monmap_contains(struct ceph_monmap *m, struct ceph_entity_addr *addr) { int i; for (i = 0; i < m->num_mon; i++) { if (ceph_addr_equal_no_type(addr, &m->mon_inst[i].addr)) return 1; } return 0; } /* * Send an auth request. */ static void __send_prepared_auth_request(struct ceph_mon_client *monc, int len) { monc->pending_auth = 1; monc->m_auth->front.iov_len = len; monc->m_auth->hdr.front_len = cpu_to_le32(len); ceph_msg_revoke(monc->m_auth); ceph_msg_get(monc->m_auth); /* keep our ref */ ceph_con_send(&monc->con, monc->m_auth); } /* * Close monitor session, if any. */ static void __close_session(struct ceph_mon_client *monc) { dout("__close_session closing mon%d\n", monc->cur_mon); ceph_msg_revoke(monc->m_auth); ceph_msg_revoke_incoming(monc->m_auth_reply); ceph_msg_revoke(monc->m_subscribe); ceph_msg_revoke_incoming(monc->m_subscribe_ack); ceph_con_close(&monc->con); monc->pending_auth = 0; ceph_auth_reset(monc->auth); } /* * Pick a new monitor at random and set cur_mon. If we are repicking * (i.e. cur_mon is already set), be sure to pick a different one. */ static void pick_new_mon(struct ceph_mon_client *monc) { int old_mon = monc->cur_mon; BUG_ON(monc->monmap->num_mon < 1); if (monc->monmap->num_mon == 1) { monc->cur_mon = 0; } else { int max = monc->monmap->num_mon; int o = -1; int n; if (monc->cur_mon >= 0) { if (monc->cur_mon < monc->monmap->num_mon) o = monc->cur_mon; if (o >= 0) max--; } n = get_random_u32_below(max); if (o >= 0 && n >= o) n++; monc->cur_mon = n; } dout("%s mon%d -> mon%d out of %d mons\n", __func__, old_mon, monc->cur_mon, monc->monmap->num_mon); } /* * Open a session with a new monitor. */ static void __open_session(struct ceph_mon_client *monc) { int ret; pick_new_mon(monc); monc->hunting = true; if (monc->had_a_connection) { monc->hunt_mult *= CEPH_MONC_HUNT_BACKOFF; if (monc->hunt_mult > CEPH_MONC_HUNT_MAX_MULT) monc->hunt_mult = CEPH_MONC_HUNT_MAX_MULT; } monc->sub_renew_after = jiffies; /* i.e., expired */ monc->sub_renew_sent = 0; dout("%s opening mon%d\n", __func__, monc->cur_mon); ceph_con_open(&monc->con, CEPH_ENTITY_TYPE_MON, monc->cur_mon, &monc->monmap->mon_inst[monc->cur_mon].addr); /* * Queue a keepalive to ensure that in case of an early fault * the messenger doesn't put us into STANDBY state and instead * retries. This also ensures that our timestamp is valid by * the time we finish hunting and delayed_work() checks it. */ ceph_con_keepalive(&monc->con); if (ceph_msgr2(monc->client)) { monc->pending_auth = 1; return; } /* initiate authentication handshake */ ret = ceph_auth_build_hello(monc->auth, monc->m_auth->front.iov_base, monc->m_auth->front_alloc_len); BUG_ON(ret <= 0); __send_prepared_auth_request(monc, ret); } static void reopen_session(struct ceph_mon_client *monc) { if (!monc->hunting) pr_info("mon%d %s session lost, hunting for new mon\n", monc->cur_mon, ceph_pr_addr(&monc->con.peer_addr)); __close_session(monc); __open_session(monc); } void ceph_monc_reopen_session(struct ceph_mon_client *monc) { mutex_lock(&monc->mutex); reopen_session(monc); mutex_unlock(&monc->mutex); } static void un_backoff(struct ceph_mon_client *monc) { monc->hunt_mult /= 2; /* reduce by 50% */ if (monc->hunt_mult < 1) monc->hunt_mult = 1; dout("%s hunt_mult now %d\n", __func__, monc->hunt_mult); } /* * Reschedule delayed work timer. */ static void __schedule_delayed(struct ceph_mon_client *monc) { unsigned long delay; if (monc->hunting) delay = CEPH_MONC_HUNT_INTERVAL * monc->hunt_mult; else delay = CEPH_MONC_PING_INTERVAL; dout("__schedule_delayed after %lu\n", delay); mod_delayed_work(system_wq, &monc->delayed_work, round_jiffies_relative(delay)); } const char *ceph_sub_str[] = { [CEPH_SUB_MONMAP] = "monmap", [CEPH_SUB_OSDMAP] = "osdmap", [CEPH_SUB_FSMAP] = "fsmap.user", [CEPH_SUB_MDSMAP] = "mdsmap", }; /* * Send subscribe request for one or more maps, according to * monc->subs. */ static void __send_subscribe(struct ceph_mon_client *monc) { struct ceph_msg *msg = monc->m_subscribe; void *p = msg->front.iov_base; void *const end = p + msg->front_alloc_len; int num = 0; int i; dout("%s sent %lu\n", __func__, monc->sub_renew_sent); BUG_ON(monc->cur_mon < 0); if (!monc->sub_renew_sent) monc->sub_renew_sent = jiffies | 1; /* never 0 */ msg->hdr.version = cpu_to_le16(2); for (i = 0; i < ARRAY_SIZE(monc->subs); i++) { if (monc->subs[i].want) num++; } BUG_ON(num < 1); /* monmap sub is always there */ ceph_encode_32(&p, num); for (i = 0; i < ARRAY_SIZE(monc->subs); i++) { char buf[32]; int len; if (!monc->subs[i].want) continue; len = sprintf(buf, "%s", ceph_sub_str[i]); if (i == CEPH_SUB_MDSMAP && monc->fs_cluster_id != CEPH_FS_CLUSTER_ID_NONE) len += sprintf(buf + len, ".%d", monc->fs_cluster_id); dout("%s %s start %llu flags 0x%x\n", __func__, buf, le64_to_cpu(monc->subs[i].item.start), monc->subs[i].item.flags); ceph_encode_string(&p, end, buf, len); memcpy(p, &monc->subs[i].item, sizeof(monc->subs[i].item)); p += sizeof(monc->subs[i].item); } BUG_ON(p > end); msg->front.iov_len = p - msg->front.iov_base; msg->hdr.front_len = cpu_to_le32(msg->front.iov_len); ceph_msg_revoke(msg); ceph_con_send(&monc->con, ceph_msg_get(msg)); } static void handle_subscribe_ack(struct ceph_mon_client *monc, struct ceph_msg *msg) { unsigned int seconds; struct ceph_mon_subscribe_ack *h = msg->front.iov_base; if (msg->front.iov_len < sizeof(*h)) goto bad; seconds = le32_to_cpu(h->duration); mutex_lock(&monc->mutex); if (monc->sub_renew_sent) { /* * This is only needed for legacy (infernalis or older) * MONs -- see delayed_work(). */ monc->sub_renew_after = monc->sub_renew_sent + (seconds >> 1) * HZ - 1; dout("%s sent %lu duration %d renew after %lu\n", __func__, monc->sub_renew_sent, seconds, monc->sub_renew_after); monc->sub_renew_sent = 0; } else { dout("%s sent %lu renew after %lu, ignoring\n", __func__, monc->sub_renew_sent, monc->sub_renew_after); } mutex_unlock(&monc->mutex); return; bad: pr_err("got corrupt subscribe-ack msg\n"); ceph_msg_dump(msg); } /* * Register interest in a map * * @sub: one of CEPH_SUB_* * @epoch: X for "every map since X", or 0 for "just the latest" */ static bool __ceph_monc_want_map(struct ceph_mon_client *monc, int sub, u32 epoch, bool continuous) { __le64 start = cpu_to_le64(epoch); u8 flags = !continuous ? CEPH_SUBSCRIBE_ONETIME : 0; dout("%s %s epoch %u continuous %d\n", __func__, ceph_sub_str[sub], epoch, continuous); if (monc->subs[sub].want && monc->subs[sub].item.start == start && monc->subs[sub].item.flags == flags) return false; monc->subs[sub].item.start = start; monc->subs[sub].item.flags = flags; monc->subs[sub].want = true; return true; } bool ceph_monc_want_map(struct ceph_mon_client *monc, int sub, u32 epoch, bool continuous) { bool need_request; mutex_lock(&monc->mutex); need_request = __ceph_monc_want_map(monc, sub, epoch, continuous); mutex_unlock(&monc->mutex); return need_request; } EXPORT_SYMBOL(ceph_monc_want_map); /* * Keep track of which maps we have * * @sub: one of CEPH_SUB_* */ static void __ceph_monc_got_map(struct ceph_mon_client *monc, int sub, u32 epoch) { dout("%s %s epoch %u\n", __func__, ceph_sub_str[sub], epoch); if (monc->subs[sub].want) { if (monc->subs[sub].item.flags & CEPH_SUBSCRIBE_ONETIME) monc->subs[sub].want = false; else monc->subs[sub].item.start = cpu_to_le64(epoch + 1); } monc->subs[sub].have = epoch; } void ceph_monc_got_map(struct ceph_mon_client *monc, int sub, u32 epoch) { mutex_lock(&monc->mutex); __ceph_monc_got_map(monc, sub, epoch); mutex_unlock(&monc->mutex); } EXPORT_SYMBOL(ceph_monc_got_map); void ceph_monc_renew_subs(struct ceph_mon_client *monc) { mutex_lock(&monc->mutex); __send_subscribe(monc); mutex_unlock(&monc->mutex); } EXPORT_SYMBOL(ceph_monc_renew_subs); /* * Wait for an osdmap with a given epoch. * * @epoch: epoch to wait for * @timeout: in jiffies, 0 means "wait forever" */ int ceph_monc_wait_osdmap(struct ceph_mon_client *monc, u32 epoch, unsigned long timeout) { unsigned long started = jiffies; long ret; mutex_lock(&monc->mutex); while (monc->subs[CEPH_SUB_OSDMAP].have < epoch) { mutex_unlock(&monc->mutex); if (timeout && time_after_eq(jiffies, started + timeout)) return -ETIMEDOUT; ret = wait_event_interruptible_timeout(monc->client->auth_wq, monc->subs[CEPH_SUB_OSDMAP].have >= epoch, ceph_timeout_jiffies(timeout)); if (ret < 0) return ret; mutex_lock(&monc->mutex); } mutex_unlock(&monc->mutex); return 0; } EXPORT_SYMBOL(ceph_monc_wait_osdmap); /* * Open a session with a random monitor. Request monmap and osdmap, * which are waited upon in __ceph_open_session(). */ int ceph_monc_open_session(struct ceph_mon_client *monc) { mutex_lock(&monc->mutex); __ceph_monc_want_map(monc, CEPH_SUB_MONMAP, 0, true); __ceph_monc_want_map(monc, CEPH_SUB_OSDMAP, 0, false); __open_session(monc); __schedule_delayed(monc); mutex_unlock(&monc->mutex); return 0; } EXPORT_SYMBOL(ceph_monc_open_session); static void ceph_monc_handle_map(struct ceph_mon_client *monc, struct ceph_msg *msg) { struct ceph_client *client = monc->client; struct ceph_monmap *monmap; void *p, *end; mutex_lock(&monc->mutex); dout("handle_monmap\n"); p = msg->front.iov_base; end = p + msg->front.iov_len; monmap = ceph_monmap_decode(&p, end, ceph_msgr2(client)); if (IS_ERR(monmap)) { pr_err("problem decoding monmap, %d\n", (int)PTR_ERR(monmap)); ceph_msg_dump(msg); goto out; } if (ceph_check_fsid(client, &monmap->fsid) < 0) { kfree(monmap); goto out; } kfree(monc->monmap); monc->monmap = monmap; __ceph_monc_got_map(monc, CEPH_SUB_MONMAP, monc->monmap->epoch); client->have_fsid = true; out: mutex_unlock(&monc->mutex); wake_up_all(&client->auth_wq); } /* * generic requests (currently statfs, mon_get_version) */ DEFINE_RB_FUNCS(generic_request, struct ceph_mon_generic_request, tid, node) static void release_generic_request(struct kref *kref) { struct ceph_mon_generic_request *req = container_of(kref, struct ceph_mon_generic_request, kref); dout("%s greq %p request %p reply %p\n", __func__, req, req->request, req->reply); WARN_ON(!RB_EMPTY_NODE(&req->node)); if (req->reply) ceph_msg_put(req->reply); if (req->request) ceph_msg_put(req->request); kfree(req); } static void put_generic_request(struct ceph_mon_generic_request *req) { if (req) kref_put(&req->kref, release_generic_request); } static void get_generic_request(struct ceph_mon_generic_request *req) { kref_get(&req->kref); } static struct ceph_mon_generic_request * alloc_generic_request(struct ceph_mon_client *monc, gfp_t gfp) { struct ceph_mon_generic_request *req; req = kzalloc(sizeof(*req), gfp); if (!req) return NULL; req->monc = monc; kref_init(&req->kref); RB_CLEAR_NODE(&req->node); init_completion(&req->completion); dout("%s greq %p\n", __func__, req); return req; } static void register_generic_request(struct ceph_mon_generic_request *req) { struct ceph_mon_client *monc = req->monc; WARN_ON(req->tid); get_generic_request(req); req->tid = ++monc->last_tid; insert_generic_request(&monc->generic_request_tree, req); } static void send_generic_request(struct ceph_mon_client *monc, struct ceph_mon_generic_request *req) { WARN_ON(!req->tid); dout("%s greq %p tid %llu\n", __func__, req, req->tid); req->request->hdr.tid = cpu_to_le64(req->tid); ceph_con_send(&monc->con, ceph_msg_get(req->request)); } static void __finish_generic_request(struct ceph_mon_generic_request *req) { struct ceph_mon_client *monc = req->monc; dout("%s greq %p tid %llu\n", __func__, req, req->tid); erase_generic_request(&monc->generic_request_tree, req); ceph_msg_revoke(req->request); ceph_msg_revoke_incoming(req->reply); } static void finish_generic_request(struct ceph_mon_generic_request *req) { __finish_generic_request(req); put_generic_request(req); } static void complete_generic_request(struct ceph_mon_generic_request *req) { if (req->complete_cb) req->complete_cb(req); else complete_all(&req->completion); put_generic_request(req); } static void cancel_generic_request(struct ceph_mon_generic_request *req) { struct ceph_mon_client *monc = req->monc; struct ceph_mon_generic_request *lookup_req; dout("%s greq %p tid %llu\n", __func__, req, req->tid); mutex_lock(&monc->mutex); lookup_req = lookup_generic_request(&monc->generic_request_tree, req->tid); if (lookup_req) { WARN_ON(lookup_req != req); finish_generic_request(req); } mutex_unlock(&monc->mutex); } static int wait_generic_request(struct ceph_mon_generic_request *req) { int ret; dout("%s greq %p tid %llu\n", __func__, req, req->tid); ret = wait_for_completion_interruptible(&req->completion); if (ret) cancel_generic_request(req); else ret = req->result; /* completed */ return ret; } static struct ceph_msg *get_generic_reply(struct ceph_connection *con, struct ceph_msg_header *hdr, int *skip) { struct ceph_mon_client *monc = con->private; struct ceph_mon_generic_request *req; u64 tid = le64_to_cpu(hdr->tid); struct ceph_msg *m; mutex_lock(&monc->mutex); req = lookup_generic_request(&monc->generic_request_tree, tid); if (!req) { dout("get_generic_reply %lld dne\n", tid); *skip = 1; m = NULL; } else { dout("get_generic_reply %lld got %p\n", tid, req->reply); *skip = 0; m = ceph_msg_get(req->reply); /* * we don't need to track the connection reading into * this reply because we only have one open connection * at a time, ever. */ } mutex_unlock(&monc->mutex); return m; } /* * statfs */ static void handle_statfs_reply(struct ceph_mon_client *monc, struct ceph_msg *msg) { struct ceph_mon_generic_request *req; struct ceph_mon_statfs_reply *reply = msg->front.iov_base; u64 tid = le64_to_cpu(msg->hdr.tid); dout("%s msg %p tid %llu\n", __func__, msg, tid); if (msg->front.iov_len != sizeof(*reply)) goto bad; mutex_lock(&monc->mutex); req = lookup_generic_request(&monc->generic_request_tree, tid); if (!req) { mutex_unlock(&monc->mutex); return; } req->result = 0; *req->u.st = reply->st; /* struct */ __finish_generic_request(req); mutex_unlock(&monc->mutex); complete_generic_request(req); return; bad: pr_err("corrupt statfs reply, tid %llu\n", tid); ceph_msg_dump(msg); } /* * Do a synchronous statfs(). */ int ceph_monc_do_statfs(struct ceph_mon_client *monc, u64 data_pool, struct ceph_statfs *buf) { struct ceph_mon_generic_request *req; struct ceph_mon_statfs *h; int ret = -ENOMEM; req = alloc_generic_request(monc, GFP_NOFS); if (!req) goto out; req->request = ceph_msg_new(CEPH_MSG_STATFS, sizeof(*h), GFP_NOFS, true); if (!req->request) goto out; req->reply = ceph_msg_new(CEPH_MSG_STATFS_REPLY, 64, GFP_NOFS, true); if (!req->reply) goto out; req->u.st = buf; req->request->hdr.version = cpu_to_le16(2); mutex_lock(&monc->mutex); register_generic_request(req); /* fill out request */ h = req->request->front.iov_base; h->monhdr.have_version = 0; h->monhdr.session_mon = cpu_to_le16(-1); h->monhdr.session_mon_tid = 0; h->fsid = monc->monmap->fsid; h->contains_data_pool = (data_pool != CEPH_NOPOOL); h->data_pool = cpu_to_le64(data_pool); send_generic_request(monc, req); mutex_unlock(&monc->mutex); ret = wait_generic_request(req); out: put_generic_request(req); return ret; } EXPORT_SYMBOL(ceph_monc_do_statfs); static void handle_get_version_reply(struct ceph_mon_client *monc, struct ceph_msg *msg) { struct ceph_mon_generic_request *req; u64 tid = le64_to_cpu(msg->hdr.tid); void *p = msg->front.iov_base; void *end = p + msg->front_alloc_len; u64 handle; dout("%s msg %p tid %llu\n", __func__, msg, tid); ceph_decode_need(&p, end, 2*sizeof(u64), bad); handle = ceph_decode_64(&p); if (tid != 0 && tid != handle) goto bad; mutex_lock(&monc->mutex); req = lookup_generic_request(&monc->generic_request_tree, handle); if (!req) { mutex_unlock(&monc->mutex); return; } req->result = 0; req->u.newest = ceph_decode_64(&p); __finish_generic_request(req); mutex_unlock(&monc->mutex); complete_generic_request(req); return; bad: pr_err("corrupt mon_get_version reply, tid %llu\n", tid); ceph_msg_dump(msg); } static struct ceph_mon_generic_request * __ceph_monc_get_version(struct ceph_mon_client *monc, const char *what, ceph_monc_callback_t cb, u64 private_data) { struct ceph_mon_generic_request *req; req = alloc_generic_request(monc, GFP_NOIO); if (!req) goto err_put_req; req->request = ceph_msg_new(CEPH_MSG_MON_GET_VERSION, sizeof(u64) + sizeof(u32) + strlen(what), GFP_NOIO, true); if (!req->request) goto err_put_req; req->reply = ceph_msg_new(CEPH_MSG_MON_GET_VERSION_REPLY, 32, GFP_NOIO, true); if (!req->reply) goto err_put_req; req->complete_cb = cb; req->private_data = private_data; mutex_lock(&monc->mutex); register_generic_request(req); { void *p = req->request->front.iov_base; void *const end = p + req->request->front_alloc_len; ceph_encode_64(&p, req->tid); /* handle */ ceph_encode_string(&p, end, what, strlen(what)); WARN_ON(p != end); } send_generic_request(monc, req); mutex_unlock(&monc->mutex); return req; err_put_req: put_generic_request(req); return ERR_PTR(-ENOMEM); } /* * Send MMonGetVersion and wait for the reply. * * @what: one of "mdsmap", "osdmap" or "monmap" */ int ceph_monc_get_version(struct ceph_mon_client *monc, const char *what, u64 *newest) { struct ceph_mon_generic_request *req; int ret; req = __ceph_monc_get_version(monc, what, NULL, 0); if (IS_ERR(req)) return PTR_ERR(req); ret = wait_generic_request(req); if (!ret) *newest = req->u.newest; put_generic_request(req); return ret; } EXPORT_SYMBOL(ceph_monc_get_version); /* * Send MMonGetVersion, * * @what: one of "mdsmap", "osdmap" or "monmap" */ int ceph_monc_get_version_async(struct ceph_mon_client *monc, const char *what, ceph_monc_callback_t cb, u64 private_data) { struct ceph_mon_generic_request *req; req = __ceph_monc_get_version(monc, what, cb, private_data); if (IS_ERR(req)) return PTR_ERR(req); put_generic_request(req); return 0; } EXPORT_SYMBOL(ceph_monc_get_version_async); static void handle_command_ack(struct ceph_mon_client *monc, struct ceph_msg *msg) { struct ceph_mon_generic_request *req; void *p = msg->front.iov_base; void *const end = p + msg->front_alloc_len; u64 tid = le64_to_cpu(msg->hdr.tid); dout("%s msg %p tid %llu\n", __func__, msg, tid); ceph_decode_need(&p, end, sizeof(struct ceph_mon_request_header) + sizeof(u32), bad); p += sizeof(struct ceph_mon_request_header); mutex_lock(&monc->mutex); req = lookup_generic_request(&monc->generic_request_tree, tid); if (!req) { mutex_unlock(&monc->mutex); return; } req->result = ceph_decode_32(&p); __finish_generic_request(req); mutex_unlock(&monc->mutex); complete_generic_request(req); return; bad: pr_err("corrupt mon_command ack, tid %llu\n", tid); ceph_msg_dump(msg); } static __printf(2, 0) int do_mon_command_vargs(struct ceph_mon_client *monc, const char *fmt, va_list ap) { struct ceph_mon_generic_request *req; struct ceph_mon_command *h; int ret = -ENOMEM; int len; req = alloc_generic_request(monc, GFP_NOIO); if (!req) goto out; req->request = ceph_msg_new(CEPH_MSG_MON_COMMAND, 256, GFP_NOIO, true); if (!req->request) goto out; req->reply = ceph_msg_new(CEPH_MSG_MON_COMMAND_ACK, 512, GFP_NOIO, true); if (!req->reply) goto out; mutex_lock(&monc->mutex); register_generic_request(req); h = req->request->front.iov_base; h->monhdr.have_version = 0; h->monhdr.session_mon = cpu_to_le16(-1); h->monhdr.session_mon_tid = 0; h->fsid = monc->monmap->fsid; h->num_strs = cpu_to_le32(1); len = vsprintf(h->str, fmt, ap); h->str_len = cpu_to_le32(len); send_generic_request(monc, req); mutex_unlock(&monc->mutex); ret = wait_generic_request(req); out: put_generic_request(req); return ret; } static __printf(2, 3) int do_mon_command(struct ceph_mon_client *monc, const char *fmt, ...) { va_list ap; int ret; va_start(ap, fmt); ret = do_mon_command_vargs(monc, fmt, ap); va_end(ap); return ret; } int ceph_monc_blocklist_add(struct ceph_mon_client *monc, struct ceph_entity_addr *client_addr) { int ret; ret = do_mon_command(monc, "{ \"prefix\": \"osd blocklist\", \ \"blocklistop\": \"add\", \ \"addr\": \"%pISpc/%u\" }", &client_addr->in_addr, le32_to_cpu(client_addr->nonce)); if (ret == -EINVAL) { /* * The monitor returns EINVAL on an unrecognized command. * Try the legacy command -- it is exactly the same except * for the name. */ ret = do_mon_command(monc, "{ \"prefix\": \"osd blacklist\", \ \"blacklistop\": \"add\", \ \"addr\": \"%pISpc/%u\" }", &client_addr->in_addr, le32_to_cpu(client_addr->nonce)); } if (ret) return ret; /* * Make sure we have the osdmap that includes the blocklist * entry. This is needed to ensure that the OSDs pick up the * new blocklist before processing any future requests from * this client. */ return ceph_wait_for_latest_osdmap(monc->client, 0); } EXPORT_SYMBOL(ceph_monc_blocklist_add); /* * Resend pending generic requests. */ static void __resend_generic_request(struct ceph_mon_client *monc) { struct ceph_mon_generic_request *req; struct rb_node *p; for (p = rb_first(&monc->generic_request_tree); p; p = rb_next(p)) { req = rb_entry(p, struct ceph_mon_generic_request, node); ceph_msg_revoke(req->request); ceph_msg_revoke_incoming(req->reply); ceph_con_send(&monc->con, ceph_msg_get(req->request)); } } /* * Delayed work. If we haven't mounted yet, retry. Otherwise, * renew/retry subscription as needed (in case it is timing out, or we * got an ENOMEM). And keep the monitor connection alive. */ static void delayed_work(struct work_struct *work) { struct ceph_mon_client *monc = container_of(work, struct ceph_mon_client, delayed_work.work); dout("monc delayed_work\n"); mutex_lock(&monc->mutex); if (monc->hunting) { dout("%s continuing hunt\n", __func__); reopen_session(monc); } else { int is_auth = ceph_auth_is_authenticated(monc->auth); if (ceph_con_keepalive_expired(&monc->con, CEPH_MONC_PING_TIMEOUT)) { dout("monc keepalive timeout\n"); is_auth = 0; reopen_session(monc); } if (!monc->hunting) { ceph_con_keepalive(&monc->con); __validate_auth(monc); un_backoff(monc); } if (is_auth && !(monc->con.peer_features & CEPH_FEATURE_MON_STATEFUL_SUB)) { unsigned long now = jiffies; dout("%s renew subs? now %lu renew after %lu\n", __func__, now, monc->sub_renew_after); if (time_after_eq(now, monc->sub_renew_after)) __send_subscribe(monc); } } __schedule_delayed(monc); mutex_unlock(&monc->mutex); } /* * On startup, we build a temporary monmap populated with the IPs * provided by mount(2). */ static int build_initial_monmap(struct ceph_mon_client *monc) { __le32 my_type = ceph_msgr2(monc->client) ? CEPH_ENTITY_ADDR_TYPE_MSGR2 : CEPH_ENTITY_ADDR_TYPE_LEGACY; struct ceph_options *opt = monc->client->options; int num_mon = opt->num_mon; int i; /* build initial monmap */ monc->monmap = kzalloc(struct_size(monc->monmap, mon_inst, num_mon), GFP_KERNEL); if (!monc->monmap) return -ENOMEM; for (i = 0; i < num_mon; i++) { struct ceph_entity_inst *inst = &monc->monmap->mon_inst[i]; memcpy(&inst->addr.in_addr, &opt->mon_addr[i].in_addr, sizeof(inst->addr.in_addr)); inst->addr.type = my_type; inst->addr.nonce = 0; inst->name.type = CEPH_ENTITY_TYPE_MON; inst->name.num = cpu_to_le64(i); } monc->monmap->num_mon = num_mon; return 0; } int ceph_monc_init(struct ceph_mon_client *monc, struct ceph_client *cl) { int err; dout("init\n"); memset(monc, 0, sizeof(*monc)); monc->client = cl; mutex_init(&monc->mutex); err = build_initial_monmap(monc); if (err) goto out; /* connection */ /* authentication */ monc->auth = ceph_auth_init(cl->options->name, cl->options->key, cl->options->con_modes); if (IS_ERR(monc->auth)) { err = PTR_ERR(monc->auth); goto out_monmap; } monc->auth->want_keys = CEPH_ENTITY_TYPE_AUTH | CEPH_ENTITY_TYPE_MON | CEPH_ENTITY_TYPE_OSD | CEPH_ENTITY_TYPE_MDS; /* msgs */ err = -ENOMEM; monc->m_subscribe_ack = ceph_msg_new(CEPH_MSG_MON_SUBSCRIBE_ACK, sizeof(struct ceph_mon_subscribe_ack), GFP_KERNEL, true); if (!monc->m_subscribe_ack) goto out_auth; monc->m_subscribe = ceph_msg_new(CEPH_MSG_MON_SUBSCRIBE, 128, GFP_KERNEL, true); if (!monc->m_subscribe) goto out_subscribe_ack; monc->m_auth_reply = ceph_msg_new(CEPH_MSG_AUTH_REPLY, 4096, GFP_KERNEL, true); if (!monc->m_auth_reply) goto out_subscribe; monc->m_auth = ceph_msg_new(CEPH_MSG_AUTH, 4096, GFP_KERNEL, true); monc->pending_auth = 0; if (!monc->m_auth) goto out_auth_reply; ceph_con_init(&monc->con, monc, &mon_con_ops, &monc->client->msgr); monc->cur_mon = -1; monc->had_a_connection = false; monc->hunt_mult = 1; INIT_DELAYED_WORK(&monc->delayed_work, delayed_work); monc->generic_request_tree = RB_ROOT; monc->last_tid = 0; monc->fs_cluster_id = CEPH_FS_CLUSTER_ID_NONE; return 0; out_auth_reply: ceph_msg_put(monc->m_auth_reply); out_subscribe: ceph_msg_put(monc->m_subscribe); out_subscribe_ack: ceph_msg_put(monc->m_subscribe_ack); out_auth: ceph_auth_destroy(monc->auth); out_monmap: kfree(monc->monmap); out: return err; } EXPORT_SYMBOL(ceph_monc_init); void ceph_monc_stop(struct ceph_mon_client *monc) { dout("stop\n"); cancel_delayed_work_sync(&monc->delayed_work); mutex_lock(&monc->mutex); __close_session(monc); monc->cur_mon = -1; mutex_unlock(&monc->mutex); /* * flush msgr queue before we destroy ourselves to ensure that: * - any work that references our embedded con is finished. * - any osd_client or other work that may reference an authorizer * finishes before we shut down the auth subsystem. */ ceph_msgr_flush(); ceph_auth_destroy(monc->auth); WARN_ON(!RB_EMPTY_ROOT(&monc->generic_request_tree)); ceph_msg_put(monc->m_auth); ceph_msg_put(monc->m_auth_reply); ceph_msg_put(monc->m_subscribe); ceph_msg_put(monc->m_subscribe_ack); kfree(monc->monmap); } EXPORT_SYMBOL(ceph_monc_stop); static void finish_hunting(struct ceph_mon_client *monc) { if (monc->hunting) { dout("%s found mon%d\n", __func__, monc->cur_mon); monc->hunting = false; monc->had_a_connection = true; un_backoff(monc); __schedule_delayed(monc); } } static void finish_auth(struct ceph_mon_client *monc, int auth_err, bool was_authed) { dout("%s auth_err %d was_authed %d\n", __func__, auth_err, was_authed); WARN_ON(auth_err > 0); monc->pending_auth = 0; if (auth_err) { monc->client->auth_err = auth_err; wake_up_all(&monc->client->auth_wq); return; } if (!was_authed && ceph_auth_is_authenticated(monc->auth)) { dout("%s authenticated, starting session global_id %llu\n", __func__, monc->auth->global_id); monc->client->msgr.inst.name.type = CEPH_ENTITY_TYPE_CLIENT; monc->client->msgr.inst.name.num = cpu_to_le64(monc->auth->global_id); __send_subscribe(monc); __resend_generic_request(monc); pr_info("mon%d %s session established\n", monc->cur_mon, ceph_pr_addr(&monc->con.peer_addr)); } } static void handle_auth_reply(struct ceph_mon_client *monc, struct ceph_msg *msg) { bool was_authed; int ret; mutex_lock(&monc->mutex); was_authed = ceph_auth_is_authenticated(monc->auth); ret = ceph_handle_auth_reply(monc->auth, msg->front.iov_base, msg->front.iov_len, monc->m_auth->front.iov_base, monc->m_auth->front_alloc_len); if (ret > 0) { __send_prepared_auth_request(monc, ret); } else { finish_auth(monc, ret, was_authed); finish_hunting(monc); } mutex_unlock(&monc->mutex); } static int __validate_auth(struct ceph_mon_client *monc) { int ret; if (monc->pending_auth) return 0; ret = ceph_build_auth(monc->auth, monc->m_auth->front.iov_base, monc->m_auth->front_alloc_len); if (ret <= 0) return ret; /* either an error, or no need to authenticate */ __send_prepared_auth_request(monc, ret); return 0; } int ceph_monc_validate_auth(struct ceph_mon_client *monc) { int ret; mutex_lock(&monc->mutex); ret = __validate_auth(monc); mutex_unlock(&monc->mutex); return ret; } EXPORT_SYMBOL(ceph_monc_validate_auth); static int mon_get_auth_request(struct ceph_connection *con, void *buf, int *buf_len, void **authorizer, int *authorizer_len) { struct ceph_mon_client *monc = con->private; int ret; mutex_lock(&monc->mutex); ret = ceph_auth_get_request(monc->auth, buf, *buf_len); mutex_unlock(&monc->mutex); if (ret < 0) return ret; *buf_len = ret; *authorizer = NULL; *authorizer_len = 0; return 0; } static int mon_handle_auth_reply_more(struct ceph_connection *con, void *reply, int reply_len, void *buf, int *buf_len, void **authorizer, int *authorizer_len) { struct ceph_mon_client *monc = con->private; int ret; mutex_lock(&monc->mutex); ret = ceph_auth_handle_reply_more(monc->auth, reply, reply_len, buf, *buf_len); mutex_unlock(&monc->mutex); if (ret < 0) return ret; *buf_len = ret; *authorizer = NULL; *authorizer_len = 0; return 0; } static int mon_handle_auth_done(struct ceph_connection *con, u64 global_id, void *reply, int reply_len, u8 *session_key, int *session_key_len, u8 *con_secret, int *con_secret_len) { struct ceph_mon_client *monc = con->private; bool was_authed; int ret; mutex_lock(&monc->mutex); WARN_ON(!monc->hunting); was_authed = ceph_auth_is_authenticated(monc->auth); ret = ceph_auth_handle_reply_done(monc->auth, global_id, reply, reply_len, session_key, session_key_len, con_secret, con_secret_len); finish_auth(monc, ret, was_authed); if (!ret) finish_hunting(monc); mutex_unlock(&monc->mutex); return 0; } static int mon_handle_auth_bad_method(struct ceph_connection *con, int used_proto, int result, const int *allowed_protos, int proto_cnt, const int *allowed_modes, int mode_cnt) { struct ceph_mon_client *monc = con->private; bool was_authed; mutex_lock(&monc->mutex); WARN_ON(!monc->hunting); was_authed = ceph_auth_is_authenticated(monc->auth); ceph_auth_handle_bad_method(monc->auth, used_proto, result, allowed_protos, proto_cnt, allowed_modes, mode_cnt); finish_auth(monc, -EACCES, was_authed); mutex_unlock(&monc->mutex); return 0; } /* * handle incoming message */ static void mon_dispatch(struct ceph_connection *con, struct ceph_msg *msg) { struct ceph_mon_client *monc = con->private; int type = le16_to_cpu(msg->hdr.type); switch (type) { case CEPH_MSG_AUTH_REPLY: handle_auth_reply(monc, msg); break; case CEPH_MSG_MON_SUBSCRIBE_ACK: handle_subscribe_ack(monc, msg); break; case CEPH_MSG_STATFS_REPLY: handle_statfs_reply(monc, msg); break; case CEPH_MSG_MON_GET_VERSION_REPLY: handle_get_version_reply(monc, msg); break; case CEPH_MSG_MON_COMMAND_ACK: handle_command_ack(monc, msg); break; case CEPH_MSG_MON_MAP: ceph_monc_handle_map(monc, msg); break; case CEPH_MSG_OSD_MAP: ceph_osdc_handle_map(&monc->client->osdc, msg); break; default: /* can the chained handler handle it? */ if (monc->client->extra_mon_dispatch && monc->client->extra_mon_dispatch(monc->client, msg) == 0) break; pr_err("received unknown message type %d %s\n", type, ceph_msg_type_name(type)); } ceph_msg_put(msg); } /* * Allocate memory for incoming message */ static struct ceph_msg *mon_alloc_msg(struct ceph_connection *con, struct ceph_msg_header *hdr, int *skip) { struct ceph_mon_client *monc = con->private; int type = le16_to_cpu(hdr->type); int front_len = le32_to_cpu(hdr->front_len); struct ceph_msg *m = NULL; *skip = 0; switch (type) { case CEPH_MSG_MON_SUBSCRIBE_ACK: m = ceph_msg_get(monc->m_subscribe_ack); break; case CEPH_MSG_STATFS_REPLY: case CEPH_MSG_MON_COMMAND_ACK: return get_generic_reply(con, hdr, skip); case CEPH_MSG_AUTH_REPLY: m = ceph_msg_get(monc->m_auth_reply); break; case CEPH_MSG_MON_GET_VERSION_REPLY: if (le64_to_cpu(hdr->tid) != 0) return get_generic_reply(con, hdr, skip); /* * Older OSDs don't set reply tid even if the original * request had a non-zero tid. Work around this weirdness * by allocating a new message. */ fallthrough; case CEPH_MSG_MON_MAP: case CEPH_MSG_MDS_MAP: case CEPH_MSG_OSD_MAP: case CEPH_MSG_FS_MAP_USER: m = ceph_msg_new(type, front_len, GFP_NOFS, false); if (!m) return NULL; /* ENOMEM--return skip == 0 */ break; } if (!m) { pr_info("alloc_msg unknown type %d\n", type); *skip = 1; } else if (front_len > m->front_alloc_len) { pr_warn("mon_alloc_msg front %d > prealloc %d (%u#%llu)\n", front_len, m->front_alloc_len, (unsigned int)con->peer_name.type, le64_to_cpu(con->peer_name.num)); ceph_msg_put(m); m = ceph_msg_new(type, front_len, GFP_NOFS, false); } return m; } /* * If the monitor connection resets, pick a new monitor and resubmit * any pending requests. */ static void mon_fault(struct ceph_connection *con) { struct ceph_mon_client *monc = con->private; mutex_lock(&monc->mutex); dout("%s mon%d\n", __func__, monc->cur_mon); if (monc->cur_mon >= 0) { if (!monc->hunting) { dout("%s hunting for new mon\n", __func__); reopen_session(monc); __schedule_delayed(monc); } else { dout("%s already hunting\n", __func__); } } mutex_unlock(&monc->mutex); } /* * We can ignore refcounting on the connection struct, as all references * will come from the messenger workqueue, which is drained prior to * mon_client destruction. */ static struct ceph_connection *mon_get_con(struct ceph_connection *con) { return con; } static void mon_put_con(struct ceph_connection *con) { } static const struct ceph_connection_operations mon_con_ops = { .get = mon_get_con, .put = mon_put_con, .alloc_msg = mon_alloc_msg, .dispatch = mon_dispatch, .fault = mon_fault, .get_auth_request = mon_get_auth_request, .handle_auth_reply_more = mon_handle_auth_reply_more, .handle_auth_done = mon_handle_auth_done, .handle_auth_bad_method = mon_handle_auth_bad_method, };