| // 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); |
| |
| /* |
| * Decode a monmap blob (e.g., during mount). |
| */ |
| struct ceph_monmap *ceph_monmap_decode(void *p, void *end) |
| { |
| struct ceph_monmap *m = NULL; |
| int i, err = -EINVAL; |
| struct ceph_fsid fsid; |
| u32 epoch, num_mon; |
| u32 len; |
| |
| ceph_decode_32_safe(&p, end, len, bad); |
| ceph_decode_need(&p, end, len, bad); |
| |
| dout("monmap_decode %p %p len %d\n", p, end, (int)(end-p)); |
| p += sizeof(u16); /* skip version */ |
| |
| ceph_decode_need(&p, end, sizeof(fsid) + 2*sizeof(u32), bad); |
| ceph_decode_copy(&p, &fsid, sizeof(fsid)); |
| epoch = ceph_decode_32(&p); |
| |
| num_mon = ceph_decode_32(&p); |
| ceph_decode_need(&p, end, num_mon*sizeof(m->mon_inst[0]), bad); |
| |
| if (num_mon >= CEPH_MAX_MON) |
| goto bad; |
| m = kmalloc(sizeof(*m) + sizeof(m->mon_inst[0])*num_mon, GFP_NOFS); |
| if (m == NULL) |
| return ERR_PTR(-ENOMEM); |
| m->fsid = fsid; |
| m->epoch = epoch; |
| m->num_mon = num_mon; |
| ceph_decode_copy(&p, m->mon_inst, num_mon*sizeof(m->mon_inst[0])); |
| for (i = 0; i < num_mon; i++) |
| ceph_decode_addr(&m->mon_inst[i].addr); |
| |
| dout("monmap_decode epoch %d, num_mon %d\n", m->epoch, |
| m->num_mon); |
| for (i = 0; i < m->num_mon; i++) |
| dout("monmap_decode mon%d is %s\n", i, |
| ceph_pr_addr(&m->mon_inst[i].addr.in_addr)); |
| return m; |
| |
| bad: |
| dout("monmap_decode failed with %d\n", err); |
| kfree(m); |
| return ERR_PTR(err); |
| } |
| |
| /* |
| * 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 (memcmp(addr, &m->mon_inst[i].addr, sizeof(*addr)) == 0) |
| 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 = prandom_u32() % 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); |
| |
| /* |
| * send an initial keepalive to ensure our timestamp is valid |
| * by the time we are in an OPENED state |
| */ |
| ceph_con_keepalive(&monc->con); |
| |
| /* 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.in_addr)); |
| |
| __close_session(monc); |
| __open_session(monc); |
| } |
| |
| 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 = NULL, *old = monc->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); |
| if (IS_ERR(monmap)) { |
| pr_err("problem decoding monmap, %d\n", |
| (int)PTR_ERR(monmap)); |
| goto out; |
| } |
| |
| if (ceph_check_fsid(monc->client, &monmap->fsid) < 0) { |
| kfree(monmap); |
| goto out; |
| } |
| |
| client->monc.monmap = monmap; |
| kfree(old); |
| |
| __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); |
| } |
| |
| int ceph_monc_blacklist_add(struct ceph_mon_client *monc, |
| struct ceph_entity_addr *client_addr) |
| { |
| 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 = sprintf(h->str, "{ \"prefix\": \"osd blacklist\", \ |
| \"blacklistop\": \"add\", \ |
| \"addr\": \"%pISpc/%u\" }", |
| &client_addr->in_addr, le32_to_cpu(client_addr->nonce)); |
| 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; |
| } |
| EXPORT_SYMBOL(ceph_monc_blacklist_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) |
| { |
| struct ceph_options *opt = monc->client->options; |
| struct ceph_entity_addr *mon_addr = opt->mon_addr; |
| int num_mon = opt->num_mon; |
| int i; |
| |
| /* build initial monmap */ |
| monc->monmap = kzalloc(sizeof(*monc->monmap) + |
| num_mon*sizeof(monc->monmap->mon_inst[0]), |
| GFP_KERNEL); |
| if (!monc->monmap) |
| return -ENOMEM; |
| for (i = 0; i < num_mon; i++) { |
| monc->monmap->mon_inst[i].addr = mon_addr[i]; |
| monc->monmap->mon_inst[i].addr.nonce = 0; |
| monc->monmap->mon_inst[i].name.type = |
| CEPH_ENTITY_TYPE_MON; |
| monc->monmap->mon_inst[i].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 = 0; |
| |
| dout("init\n"); |
| memset(monc, 0, sizeof(*monc)); |
| monc->client = cl; |
| monc->monmap = NULL; |
| 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); |
| 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 handle_auth_reply(struct ceph_mon_client *monc, |
| struct ceph_msg *msg) |
| { |
| int ret; |
| int was_auth = 0; |
| |
| mutex_lock(&monc->mutex); |
| was_auth = ceph_auth_is_authenticated(monc->auth); |
| monc->pending_auth = 0; |
| 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); |
| goto out; |
| } |
| |
| finish_hunting(monc); |
| |
| if (ret < 0) { |
| monc->client->auth_err = ret; |
| } else if (!was_auth && ceph_auth_is_authenticated(monc->auth)) { |
| dout("authenticated, starting session\n"); |
| |
| 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.in_addr)); |
| } |
| |
| out: |
| mutex_unlock(&monc->mutex); |
| if (monc->client->auth_err < 0) |
| wake_up_all(&monc->client->auth_wq); |
| } |
| |
| 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); |
| |
| /* |
| * handle incoming message |
| */ |
| static void dispatch(struct ceph_connection *con, struct ceph_msg *msg) |
| { |
| struct ceph_mon_client *monc = con->private; |
| int type = le16_to_cpu(msg->hdr.type); |
| |
| if (!monc) |
| return; |
| |
| 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 orignal |
| * request had a non-zero tid. Workaround this weirdness |
| * by falling through to the allocate case. |
| */ |
| 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 *con_get(struct ceph_connection *con) |
| { |
| return con; |
| } |
| |
| static void con_put(struct ceph_connection *con) |
| { |
| } |
| |
| static const struct ceph_connection_operations mon_con_ops = { |
| .get = con_get, |
| .put = con_put, |
| .dispatch = dispatch, |
| .fault = mon_fault, |
| .alloc_msg = mon_alloc_msg, |
| }; |