diff options
Diffstat (limited to 'net/ceph/mon_client.c')
| -rw-r--r-- | net/ceph/mon_client.c | 1027 |
1 files changed, 1027 insertions, 0 deletions
diff --git a/net/ceph/mon_client.c b/net/ceph/mon_client.c new file mode 100644 index 00000000000..8a079399174 --- /dev/null +++ b/net/ceph/mon_client.c @@ -0,0 +1,1027 @@ +#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/mon_client.h> +#include <linux/ceph/libceph.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; + u16 version; + 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)); + + ceph_decode_16_safe(&p, end, version, bad); + + 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_con_revoke(monc->con, 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) +{ + if (monc->con) { + dout("__close_session closing mon%d\n", monc->cur_mon); + ceph_con_revoke(monc->con, monc->m_auth); + ceph_con_close(monc->con); + monc->cur_mon = -1; + monc->pending_auth = 0; + ceph_auth_reset(monc->auth); + } +} + +/* + * Open a session with a (new) monitor. + */ +static int __open_session(struct ceph_mon_client *monc) +{ + char r; + int ret; + + if (monc->cur_mon < 0) { + get_random_bytes(&r, 1); + monc->cur_mon = r % monc->monmap->num_mon; + dout("open_session num=%d r=%d -> mon%d\n", + monc->monmap->num_mon, r, monc->cur_mon); + monc->sub_sent = 0; + monc->sub_renew_after = jiffies; /* i.e., expired */ + monc->want_next_osdmap = !!monc->want_next_osdmap; + + dout("open_session mon%d opening\n", monc->cur_mon); + monc->con->peer_name.type = CEPH_ENTITY_TYPE_MON; + monc->con->peer_name.num = cpu_to_le64(monc->cur_mon); + ceph_con_open(monc->con, + &monc->monmap->mon_inst[monc->cur_mon].addr); + + /* initiatiate authentication handshake */ + ret = ceph_auth_build_hello(monc->auth, + monc->m_auth->front.iov_base, + monc->m_auth->front_max); + __send_prepared_auth_request(monc, ret); + } else { + dout("open_session mon%d already open\n", monc->cur_mon); + } + return 0; +} + +static bool __sub_expired(struct ceph_mon_client *monc) +{ + return time_after_eq(jiffies, monc->sub_renew_after); +} + +/* + * Reschedule delayed work timer. + */ +static void __schedule_delayed(struct ceph_mon_client *monc) +{ + unsigned delay; + + if (monc->cur_mon < 0 || __sub_expired(monc)) + delay = 10 * HZ; + else + delay = 20 * HZ; + dout("__schedule_delayed after %u\n", delay); + schedule_delayed_work(&monc->delayed_work, delay); +} + +/* + * Send subscribe request for mdsmap and/or osdmap. + */ +static void __send_subscribe(struct ceph_mon_client *monc) +{ + dout("__send_subscribe sub_sent=%u exp=%u want_osd=%d\n", + (unsigned)monc->sub_sent, __sub_expired(monc), + monc->want_next_osdmap); + if ((__sub_expired(monc) && !monc->sub_sent) || + monc->want_next_osdmap == 1) { + struct ceph_msg *msg = monc->m_subscribe; + struct ceph_mon_subscribe_item *i; + void *p, *end; + int num; + + p = msg->front.iov_base; + end = p + msg->front_max; + + num = 1 + !!monc->want_next_osdmap + !!monc->want_mdsmap; + ceph_encode_32(&p, num); + + if (monc->want_next_osdmap) { + dout("__send_subscribe to 'osdmap' %u\n", + (unsigned)monc->have_osdmap); + ceph_encode_string(&p, end, "osdmap", 6); + i = p; + i->have = cpu_to_le64(monc->have_osdmap); + i->onetime = 1; + p += sizeof(*i); + monc->want_next_osdmap = 2; /* requested */ + } + if (monc->want_mdsmap) { + dout("__send_subscribe to 'mdsmap' %u+\n", + (unsigned)monc->have_mdsmap); + ceph_encode_string(&p, end, "mdsmap", 6); + i = p; + i->have = cpu_to_le64(monc->have_mdsmap); + i->onetime = 0; + p += sizeof(*i); + } + ceph_encode_string(&p, end, "monmap", 6); + i = p; + i->have = 0; + i->onetime = 0; + p += sizeof(*i); + + msg->front.iov_len = p - msg->front.iov_base; + msg->hdr.front_len = cpu_to_le32(msg->front.iov_len); + ceph_con_revoke(monc->con, msg); + ceph_con_send(monc->con, ceph_msg_get(msg)); + + monc->sub_sent = jiffies | 1; /* never 0 */ + } +} + +static void handle_subscribe_ack(struct ceph_mon_client *monc, + struct ceph_msg *msg) +{ + unsigned 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->hunting) { + pr_info("mon%d %s session established\n", + monc->cur_mon, + ceph_pr_addr(&monc->con->peer_addr.in_addr)); + monc->hunting = false; + } + dout("handle_subscribe_ack after %d seconds\n", seconds); + monc->sub_renew_after = monc->sub_sent + (seconds >> 1)*HZ - 1; + monc->sub_sent = 0; + mutex_unlock(&monc->mutex); + return; +bad: + pr_err("got corrupt subscribe-ack msg\n"); + ceph_msg_dump(msg); +} + +/* + * Keep track of which maps we have + */ +int ceph_monc_got_mdsmap(struct ceph_mon_client *monc, u32 got) +{ + mutex_lock(&monc->mutex); + monc->have_mdsmap = got; + mutex_unlock(&monc->mutex); + return 0; +} +EXPORT_SYMBOL(ceph_monc_got_mdsmap); + +int ceph_monc_got_osdmap(struct ceph_mon_client *monc, u32 got) +{ + mutex_lock(&monc->mutex); + monc->have_osdmap = got; + monc->want_next_osdmap = 0; + mutex_unlock(&monc->mutex); + return 0; +} + +/* + * Register interest in the next osdmap + */ +void ceph_monc_request_next_osdmap(struct ceph_mon_client *monc) +{ + dout("request_next_osdmap have %u\n", monc->have_osdmap); + mutex_lock(&monc->mutex); + if (!monc->want_next_osdmap) + monc->want_next_osdmap = 1; + if (monc->want_next_osdmap < 2) + __send_subscribe(monc); + mutex_unlock(&monc->mutex); +} + +/* + * + */ +int ceph_monc_open_session(struct ceph_mon_client *monc) +{ + if (!monc->con) { + monc->con = kmalloc(sizeof(*monc->con), GFP_KERNEL); + if (!monc->con) + return -ENOMEM; + ceph_con_init(monc->client->msgr, monc->con); + monc->con->private = monc; + monc->con->ops = &mon_con_ops; + } + + mutex_lock(&monc->mutex); + __open_session(monc); + __schedule_delayed(monc); + mutex_unlock(&monc->mutex); + return 0; +} +EXPORT_SYMBOL(ceph_monc_open_session); + +/* + * The monitor responds with mount ack indicate mount success. The + * included client ticket allows the client to talk to MDSs and OSDs. + */ +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); + +out: + mutex_unlock(&monc->mutex); + wake_up_all(&client->auth_wq); +} + +/* + * generic requests (e.g., statfs, poolop) + */ +static struct ceph_mon_generic_request *__lookup_generic_req( + struct ceph_mon_client *monc, u64 tid) +{ + struct ceph_mon_generic_request *req; + struct rb_node *n = monc->generic_request_tree.rb_node; + + while (n) { + req = rb_entry(n, struct ceph_mon_generic_request, node); + if (tid < req->tid) + n = n->rb_left; + else if (tid > req->tid) + n = n->rb_right; + else + return req; + } + return NULL; +} + +static void __insert_generic_request(struct ceph_mon_client *monc, + struct ceph_mon_generic_request *new) +{ + struct rb_node **p = &monc->generic_request_tree.rb_node; + struct rb_node *parent = NULL; + struct ceph_mon_generic_request *req = NULL; + + while (*p) { + parent = *p; + req = rb_entry(parent, struct ceph_mon_generic_request, node); + if (new->tid < req->tid) + p = &(*p)->rb_left; + else if (new->tid > req->tid) + p = &(*p)->rb_right; + else + BUG(); + } + + rb_link_node(&new->node, parent, p); + rb_insert_color(&new->node, &monc->generic_request_tree); +} + +static void release_generic_request(struct kref *kref) +{ + struct ceph_mon_generic_request *req = + container_of(kref, struct ceph_mon_generic_request, kref); + + 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) +{ + 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_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_req(monc, 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); + 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; +} + +static int do_generic_request(struct ceph_mon_client *monc, + struct ceph_mon_generic_request *req) +{ + int err; + + /* register request */ + mutex_lock(&monc->mutex); + req->tid = ++monc->last_tid; + req->request->hdr.tid = cpu_to_le64(req->tid); + __insert_generic_request(monc, req); + monc->num_generic_requests++; + ceph_con_send(monc->con, ceph_msg_get(req->request)); + mutex_unlock(&monc->mutex); + + err = wait_for_completion_interruptible(&req->completion); + + mutex_lock(&monc->mutex); + rb_erase(&req->node, &monc->generic_request_tree); + monc->num_generic_requests--; + mutex_unlock(&monc->mutex); + + if (!err) + err = req->result; + return err; +} + +/* + * 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); + + if (msg->front.iov_len != sizeof(*reply)) + goto bad; + dout("handle_statfs_reply %p tid %llu\n", msg, tid); + + mutex_lock(&monc->mutex); + req = __lookup_generic_req(monc, tid); + if (req) { + *(struct ceph_statfs *)req->buf = reply->st; + req->result = 0; + get_generic_request(req); + } + mutex_unlock(&monc->mutex); + if (req) { + complete_all(&req->completion); + put_generic_request(req); + } + return; + +bad: + pr_err("corrupt generic reply, tid %llu\n", tid); + ceph_msg_dump(msg); +} + +/* + * Do a synchronous statfs(). + */ +int ceph_monc_do_statfs(struct ceph_mon_client *monc, struct ceph_statfs *buf) +{ + struct ceph_mon_generic_request *req; + struct ceph_mon_statfs *h; + int err; + + req = kzalloc(sizeof(*req), GFP_NOFS); + if (!req) + return -ENOMEM; + + kref_init(&req->kref); + req->buf = buf; + req->buf_len = sizeof(*buf); + init_completion(&req->completion); + + err = -ENOMEM; + req->request = ceph_msg_new(CEPH_MSG_STATFS, sizeof(*h), GFP_NOFS); + if (!req->request) + goto out; + req->reply = ceph_msg_new(CEPH_MSG_STATFS_REPLY, 1024, GFP_NOFS); + if (!req->reply) + goto out; + + /* 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; + + err = do_generic_request(monc, req); + +out: + kref_put(&req->kref, release_generic_request); + return err; +} +EXPORT_SYMBOL(ceph_monc_do_statfs); + +/* + * pool ops + */ +static int get_poolop_reply_buf(const char *src, size_t src_len, + char *dst, size_t dst_len) +{ + u32 buf_len; + + if (src_len != sizeof(u32) + dst_len) + return -EINVAL; + + buf_len = le32_to_cpu(*(u32 *)src); + if (buf_len != dst_len) + return -EINVAL; + + memcpy(dst, src + sizeof(u32), dst_len); + return 0; +} + +static void handle_poolop_reply(struct ceph_mon_client *monc, + struct ceph_msg *msg) +{ + struct ceph_mon_generic_request *req; + struct ceph_mon_poolop_reply *reply = msg->front.iov_base; + u64 tid = le64_to_cpu(msg->hdr.tid); + + if (msg->front.iov_len < sizeof(*reply)) + goto bad; + dout("handle_poolop_reply %p tid %llu\n", msg, tid); + + mutex_lock(&monc->mutex); + req = __lookup_generic_req(monc, tid); + if (req) { + if (req->buf_len && + get_poolop_reply_buf(msg->front.iov_base + sizeof(*reply), + msg->front.iov_len - sizeof(*reply), + req->buf, req->buf_len) < 0) { + mutex_unlock(&monc->mutex); + goto bad; + } + req->result = le32_to_cpu(reply->reply_code); + get_generic_request(req); + } + mutex_unlock(&monc->mutex); + if (req) { + complete(&req->completion); + put_generic_request(req); + } + return; + +bad: + pr_err("corrupt generic reply, tid %llu\n", tid); + ceph_msg_dump(msg); +} + +/* + * Do a synchronous pool op. + */ +int ceph_monc_do_poolop(struct ceph_mon_client *monc, u32 op, + u32 pool, u64 snapid, + char *buf, int len) +{ + struct ceph_mon_generic_request *req; + struct ceph_mon_poolop *h; + int err; + + req = kzalloc(sizeof(*req), GFP_NOFS); + if (!req) + return -ENOMEM; + + kref_init(&req->kref); + req->buf = buf; + req->buf_len = len; + init_completion(&req->completion); + + err = -ENOMEM; + req->request = ceph_msg_new(CEPH_MSG_POOLOP, sizeof(*h), GFP_NOFS); + if (!req->request) + goto out; + req->reply = ceph_msg_new(CEPH_MSG_POOLOP_REPLY, 1024, GFP_NOFS); + if (!req->reply) + goto out; + + /* fill out request */ + req->request->hdr.version = cpu_to_le16(2); + 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->pool = cpu_to_le32(pool); + h->op = cpu_to_le32(op); + h->auid = 0; + h->snapid = cpu_to_le64(snapid); + h->name_len = 0; + + err = do_generic_request(monc, req); + +out: + kref_put(&req->kref, release_generic_request); + return err; +} + +int ceph_monc_create_snapid(struct ceph_mon_client *monc, + u32 pool, u64 *snapid) +{ + return ceph_monc_do_poolop(monc, POOL_OP_CREATE_UNMANAGED_SNAP, + pool, 0, (char *)snapid, sizeof(*snapid)); + +} +EXPORT_SYMBOL(ceph_monc_create_snapid); + +int ceph_monc_delete_snapid(struct ceph_mon_client *monc, + u32 pool, u64 snapid) +{ + return ceph_monc_do_poolop(monc, POOL_OP_CREATE_UNMANAGED_SNAP, + pool, snapid, 0, 0); + +} + +/* + * 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_con_revoke(monc->con, req->request); + 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) { + __close_session(monc); + __open_session(monc); /* continue hunting */ + } else { + ceph_con_keepalive(monc->con); + + __validate_auth(monc); + + if (monc->auth->ops->is_authenticated(monc->auth)) + __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; + monc->have_fsid = false; + 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; + + monc->con = NULL; + + /* authentication */ + monc->auth = ceph_auth_init(cl->options->name, + cl->options->secret); + if (IS_ERR(monc->auth)) + return PTR_ERR(monc->auth); + 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_NOFS); + if (!monc->m_subscribe_ack) + goto out_monmap; + + monc->m_subscribe = ceph_msg_new(CEPH_MSG_MON_SUBSCRIBE, 96, GFP_NOFS); + if (!monc->m_subscribe) + goto out_subscribe_ack; + + monc->m_auth_reply = ceph_msg_new(CEPH_MSG_AUTH_REPLY, 4096, GFP_NOFS); + if (!monc->m_auth_reply) + goto out_subscribe; + + monc->m_auth = ceph_msg_new(CEPH_MSG_AUTH, 4096, GFP_NOFS); + monc->pending_auth = 0; + if (!monc->m_auth) + goto out_auth_reply; + + monc->cur_mon = -1; + monc->hunting = true; + monc->sub_renew_after = jiffies; + monc->sub_sent = 0; + + INIT_DELAYED_WORK(&monc->delayed_work, delayed_work); + monc->generic_request_tree = RB_ROOT; + monc->num_generic_requests = 0; + monc->last_tid = 0; + + monc->have_mdsmap = 0; + monc->have_osdmap = 0; + monc->want_next_osdmap = 1; + 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_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); + if (monc->con) { + monc->con->private = NULL; + monc->con->ops->put(monc->con); + monc->con = NULL; + } + mutex_unlock(&monc->mutex); + + ceph_auth_destroy(monc->auth); + + 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 handle_auth_reply(struct ceph_mon_client *monc, + struct ceph_msg *msg) +{ + int ret; + int was_auth = 0; + + mutex_lock(&monc->mutex); + if (monc->auth->ops) + was_auth = monc->auth->ops->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_max); + if (ret < 0) { + monc->client->auth_err = ret; + wake_up_all(&monc->client->auth_wq); + } else if (ret > 0) { + __send_prepared_auth_request(monc, ret); + } else if (!was_auth && monc->auth->ops->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); + } + 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_max); + 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_POOLOP_REPLY: + handle_poolop_reply(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_POOLOP_REPLY: + case CEPH_MSG_STATFS_REPLY: + 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_MAP: + case CEPH_MSG_MDS_MAP: + case CEPH_MSG_OSD_MAP: + m = ceph_msg_new(type, front_len, GFP_NOFS); + break; + } + + if (!m) { + pr_info("alloc_msg unknown type %d\n", type); + *skip = 1; + } + 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; + + if (!monc) + return; + + dout("mon_fault\n"); + mutex_lock(&monc->mutex); + if (!con->private) + goto out; + + if (monc->con && !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); + if (!monc->hunting) { + /* start hunting */ + monc->hunting = true; + __open_session(monc); + } else { + /* already hunting, let's wait a bit */ + __schedule_delayed(monc); + } +out: + mutex_unlock(&monc->mutex); +} + +static const struct ceph_connection_operations mon_con_ops = { + .get = ceph_con_get, + .put = ceph_con_put, + .dispatch = dispatch, + .fault = mon_fault, + .alloc_msg = mon_alloc_msg, +}; |