#include "ceph_debug.h" #include <linux/err.h> #include <linux/highmem.h> #include <linux/mm.h> #include <linux/pagemap.h> #include <linux/slab.h> #include <linux/uaccess.h> #include "super.h" #include "osd_client.h" #include "messenger.h" #include "decode.h" #include "auth.h" #define OSD_OP_FRONT_LEN 4096 #define OSD_OPREPLY_FRONT_LEN 512 static const struct ceph_connection_operations osd_con_ops; static int __kick_requests(struct ceph_osd_client *osdc, struct ceph_osd *kickosd); static void kick_requests(struct ceph_osd_client *osdc, struct ceph_osd *osd); /* * Implement client access to distributed object storage cluster. * * All data objects are stored within a cluster/cloud of OSDs, or * "object storage devices." (Note that Ceph OSDs have _nothing_ to * do with the T10 OSD extensions to SCSI.) Ceph OSDs are simply * remote daemons serving up and coordinating consistent and safe * access to storage. * * Cluster membership and the mapping of data objects onto storage devices * are described by the osd map. * * We keep track of pending OSD requests (read, write), resubmit * requests to different OSDs when the cluster topology/data layout * change, or retry the affected requests when the communications * channel with an OSD is reset. */ /* * calculate the mapping of a file extent onto an object, and fill out the * request accordingly. shorten extent as necessary if it crosses an * object boundary. * * fill osd op in request message. */ static void calc_layout(struct ceph_osd_client *osdc, struct ceph_vino vino, struct ceph_file_layout *layout, u64 off, u64 *plen, struct ceph_osd_request *req) { struct ceph_osd_request_head *reqhead = req->r_request->front.iov_base; struct ceph_osd_op *op = (void *)(reqhead + 1); u64 orig_len = *plen; u64 objoff, objlen; /* extent in object */ u64 bno; reqhead->snapid = cpu_to_le64(vino.snap); /* object extent? */ ceph_calc_file_object_mapping(layout, off, plen, &bno, &objoff, &objlen); if (*plen < orig_len) dout(" skipping last %llu, final file extent %llu~%llu\n", orig_len - *plen, off, *plen); sprintf(req->r_oid, "%llx.%08llx", vino.ino, bno); req->r_oid_len = strlen(req->r_oid); op->extent.offset = cpu_to_le64(objoff); op->extent.length = cpu_to_le64(objlen); req->r_num_pages = calc_pages_for(off, *plen); dout("calc_layout %s (%d) %llu~%llu (%d pages)\n", req->r_oid, req->r_oid_len, objoff, objlen, req->r_num_pages); } /* * requests */ void ceph_osdc_release_request(struct kref *kref) { struct ceph_osd_request *req = container_of(kref, struct ceph_osd_request, r_kref); if (req->r_request) ceph_msg_put(req->r_request); if (req->r_reply) ceph_msg_put(req->r_reply); if (req->r_con_filling_msg) { dout("release_request revoking pages %p from con %p\n", req->r_pages, req->r_con_filling_msg); ceph_con_revoke_message(req->r_con_filling_msg, req->r_reply); ceph_con_put(req->r_con_filling_msg); } if (req->r_own_pages) ceph_release_page_vector(req->r_pages, req->r_num_pages); ceph_put_snap_context(req->r_snapc); if (req->r_mempool) mempool_free(req, req->r_osdc->req_mempool); else kfree(req); } /* * build new request AND message, calculate layout, and adjust file * extent as needed. * * if the file was recently truncated, we include information about its * old and new size so that the object can be updated appropriately. (we * avoid synchronously deleting truncated objects because it's slow.) * * if @do_sync, include a 'startsync' command so that the osd will flush * data quickly. */ struct ceph_osd_request *ceph_osdc_new_request(struct ceph_osd_client *osdc, struct ceph_file_layout *layout, struct ceph_vino vino, u64 off, u64 *plen, int opcode, int flags, struct ceph_snap_context *snapc, int do_sync, u32 truncate_seq, u64 truncate_size, struct timespec *mtime, bool use_mempool, int num_reply) { struct ceph_osd_request *req; struct ceph_msg *msg; struct ceph_osd_request_head *head; struct ceph_osd_op *op; void *p; int num_op = 1 + do_sync; size_t msg_size = sizeof(*head) + num_op*sizeof(*op); int i; if (use_mempool) { req = mempool_alloc(osdc->req_mempool, GFP_NOFS); memset(req, 0, sizeof(*req)); } else { req = kzalloc(sizeof(*req), GFP_NOFS); } if (req == NULL) return NULL; req->r_osdc = osdc; req->r_mempool = use_mempool; kref_init(&req->r_kref); init_completion(&req->r_completion); init_completion(&req->r_safe_completion); INIT_LIST_HEAD(&req->r_unsafe_item); req->r_flags = flags; WARN_ON((flags & (CEPH_OSD_FLAG_READ|CEPH_OSD_FLAG_WRITE)) == 0); /* create reply message */ if (use_mempool) msg = ceph_msgpool_get(&osdc->msgpool_op_reply, 0); else msg = ceph_msg_new(CEPH_MSG_OSD_OPREPLY, OSD_OPREPLY_FRONT_LEN, GFP_NOFS); if (!msg) { ceph_osdc_put_request(req); return NULL; } req->r_reply = msg; /* create request message; allow space for oid */ msg_size += 40; if (snapc) msg_size += sizeof(u64) * snapc->num_snaps; if (use_mempool) msg = ceph_msgpool_get(&osdc->msgpool_op, 0); else msg = ceph_msg_new(CEPH_MSG_OSD_OP, msg_size, GFP_NOFS); if (!msg) { ceph_osdc_put_request(req); return NULL; } msg->hdr.type = cpu_to_le16(CEPH_MSG_OSD_OP); memset(msg->front.iov_base, 0, msg->front.iov_len); head = msg->front.iov_base; op = (void *)(head + 1); p = (void *)(op + num_op); req->r_request = msg; req->r_snapc = ceph_get_snap_context(snapc); head->client_inc = cpu_to_le32(1); /* always, for now. */ head->flags = cpu_to_le32(flags); if (flags & CEPH_OSD_FLAG_WRITE) ceph_encode_timespec(&head->mtime, mtime); head->num_ops = cpu_to_le16(num_op); op->op = cpu_to_le16(opcode); /* calculate max write size */ calc_layout(osdc, vino, layout, off, plen, req); req->r_file_layout = *layout; /* keep a copy */ if (flags & CEPH_OSD_FLAG_WRITE) { req->r_request->hdr.data_off = cpu_to_le16(off); req->r_request->hdr.data_len = cpu_to_le32(*plen); op->payload_len = cpu_to_le32(*plen); } op->extent.truncate_size = cpu_to_le64(truncate_size); op->extent.truncate_seq = cpu_to_le32(truncate_seq); /* fill in oid */ head->object_len = cpu_to_le32(req->r_oid_len); memcpy(p, req->r_oid, req->r_oid_len); p += req->r_oid_len; if (do_sync) { op++; op->op = cpu_to_le16(CEPH_OSD_OP_STARTSYNC); } if (snapc) { head->snap_seq = cpu_to_le64(snapc->seq); head->num_snaps = cpu_to_le32(snapc->num_snaps); for (i = 0; i < snapc->num_snaps; i++) { put_unaligned_le64(snapc->snaps[i], p); p += sizeof(u64); } } BUG_ON(p > msg->front.iov_base + msg->front.iov_len); msg_size = p - msg->front.iov_base; msg->front.iov_len = msg_size; msg->hdr.front_len = cpu_to_le32(msg_size); return req; } /* * We keep osd requests in an rbtree, sorted by ->r_tid. */ static void __insert_request(struct ceph_osd_client *osdc, struct ceph_osd_request *new) { struct rb_node **p = &osdc->requests.rb_node; struct rb_node *parent = NULL; struct ceph_osd_request *req = NULL; while (*p) { parent = *p; req = rb_entry(parent, struct ceph_osd_request, r_node); if (new->r_tid < req->r_tid) p = &(*p)->rb_left; else if (new->r_tid > req->r_tid) p = &(*p)->rb_right; else BUG(); } rb_link_node(&new->r_node, parent, p); rb_insert_color(&new->r_node, &osdc->requests); } static struct ceph_osd_request *__lookup_request(struct ceph_osd_client *osdc, u64 tid) { struct ceph_osd_request *req; struct rb_node *n = osdc->requests.rb_node; while (n) { req = rb_entry(n, struct ceph_osd_request, r_node); if (tid < req->r_tid) n = n->rb_left; else if (tid > req->r_tid) n = n->rb_right; else return req; } return NULL; } static struct ceph_osd_request * __lookup_request_ge(struct ceph_osd_client *osdc, u64 tid) { struct ceph_osd_request *req; struct rb_node *n = osdc->requests.rb_node; while (n) { req = rb_entry(n, struct ceph_osd_request, r_node); if (tid < req->r_tid) { if (!n->rb_left) return req; n = n->rb_left; } else if (tid > req->r_tid) { n = n->rb_right; } else { return req; } } return NULL; } /* * If the osd connection drops, we need to resubmit all requests. */ static void osd_reset(struct ceph_connection *con) { struct ceph_osd *osd = con->private; struct ceph_osd_client *osdc; if (!osd) return; dout("osd_reset osd%d\n", osd->o_osd); osdc = osd->o_osdc; down_read(&osdc->map_sem); kick_requests(osdc, osd); up_read(&osdc->map_sem); } /* * Track open sessions with osds. */ static struct ceph_osd *create_osd(struct ceph_osd_client *osdc) { struct ceph_osd *osd; osd = kzalloc(sizeof(*osd), GFP_NOFS); if (!osd) return NULL; atomic_set(&osd->o_ref, 1); osd->o_osdc = osdc; INIT_LIST_HEAD(&osd->o_requests); INIT_LIST_HEAD(&osd->o_osd_lru); osd->o_incarnation = 1; ceph_con_init(osdc->client->msgr, &osd->o_con); osd->o_con.private = osd; osd->o_con.ops = &osd_con_ops; osd->o_con.peer_name.type = CEPH_ENTITY_TYPE_OSD; INIT_LIST_HEAD(&osd->o_keepalive_item); return osd; } static struct ceph_osd *get_osd(struct ceph_osd *osd) { if (atomic_inc_not_zero(&osd->o_ref)) { dout("get_osd %p %d -> %d\n", osd, atomic_read(&osd->o_ref)-1, atomic_read(&osd->o_ref)); return osd; } else { dout("get_osd %p FAIL\n", osd); return NULL; } } static void put_osd(struct ceph_osd *osd) { dout("put_osd %p %d -> %d\n", osd, atomic_read(&osd->o_ref), atomic_read(&osd->o_ref) - 1); if (atomic_dec_and_test(&osd->o_ref)) { struct ceph_auth_client *ac = osd->o_osdc->client->monc.auth; if (osd->o_authorizer) ac->ops->destroy_authorizer(ac, osd->o_authorizer); kfree(osd); } } /* * remove an osd from our map */ static void __remove_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd) { dout("__remove_osd %p\n", osd); BUG_ON(!list_empty(&osd->o_requests)); rb_erase(&osd->o_node, &osdc->osds); list_del_init(&osd->o_osd_lru); ceph_con_close(&osd->o_con); put_osd(osd); } static void __move_osd_to_lru(struct ceph_osd_client *osdc, struct ceph_osd *osd) { dout("__move_osd_to_lru %p\n", osd); BUG_ON(!list_empty(&osd->o_osd_lru)); list_add_tail(&osd->o_osd_lru, &osdc->osd_lru); osd->lru_ttl = jiffies + osdc->client->mount_args->osd_idle_ttl * HZ; } static void __remove_osd_from_lru(struct ceph_osd *osd) { dout("__remove_osd_from_lru %p\n", osd); if (!list_empty(&osd->o_osd_lru)) list_del_init(&osd->o_osd_lru); } static void remove_old_osds(struct ceph_osd_client *osdc, int remove_all) { struct ceph_osd *osd, *nosd; dout("__remove_old_osds %p\n", osdc); mutex_lock(&osdc->request_mutex); list_for_each_entry_safe(osd, nosd, &osdc->osd_lru, o_osd_lru) { if (!remove_all && time_before(jiffies, osd->lru_ttl)) break; __remove_osd(osdc, osd); } mutex_unlock(&osdc->request_mutex); } /* * reset osd connect */ static int __reset_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd) { struct ceph_osd_request *req; int ret = 0; dout("__reset_osd %p osd%d\n", osd, osd->o_osd); if (list_empty(&osd->o_requests)) { __remove_osd(osdc, osd); } else if (memcmp(&osdc->osdmap->osd_addr[osd->o_osd], &osd->o_con.peer_addr, sizeof(osd->o_con.peer_addr)) == 0 && !ceph_con_opened(&osd->o_con)) { dout(" osd addr hasn't changed and connection never opened," " letting msgr retry"); /* touch each r_stamp for handle_timeout()'s benfit */ list_for_each_entry(req, &osd->o_requests, r_osd_item) req->r_stamp = jiffies; ret = -EAGAIN; } else { ceph_con_close(&osd->o_con); ceph_con_open(&osd->o_con, &osdc->osdmap->osd_addr[osd->o_osd]); osd->o_incarnation++; } return ret; } static void __insert_osd(struct ceph_osd_client *osdc, struct ceph_osd *new) { struct rb_node **p = &osdc->osds.rb_node; struct rb_node *parent = NULL; struct ceph_osd *osd = NULL; while (*p) { parent = *p; osd = rb_entry(parent, struct ceph_osd, o_node); if (new->o_osd < osd->o_osd) p = &(*p)->rb_left; else if (new->o_osd > osd->o_osd) p = &(*p)->rb_right; else BUG(); } rb_link_node(&new->o_node, parent, p); rb_insert_color(&new->o_node, &osdc->osds); } static struct ceph_osd *__lookup_osd(struct ceph_osd_client *osdc, int o) { struct ceph_osd *osd; struct rb_node *n = osdc->osds.rb_node; while (n) { osd = rb_entry(n, struct ceph_osd, o_node); if (o < osd->o_osd) n = n->rb_left; else if (o > osd->o_osd) n = n->rb_right; else return osd; } return NULL; } static void __schedule_osd_timeout(struct ceph_osd_client *osdc) { schedule_delayed_work(&osdc->timeout_work, osdc->client->mount_args->osd_keepalive_timeout * HZ); } static void __cancel_osd_timeout(struct ceph_osd_client *osdc) { cancel_delayed_work(&osdc->timeout_work); } /* * Register request, assign tid. If this is the first request, set up * the timeout event. */ static void register_request(struct ceph_osd_client *osdc, struct ceph_osd_request *req) { mutex_lock(&osdc->request_mutex); req->r_tid = ++osdc->last_tid; req->r_request->hdr.tid = cpu_to_le64(req->r_tid); INIT_LIST_HEAD(&req->r_req_lru_item); dout("register_request %p tid %lld\n", req, req->r_tid); __insert_request(osdc, req); ceph_osdc_get_request(req); osdc->num_requests++; if (osdc->num_requests == 1) { dout(" first request, scheduling timeout\n"); __schedule_osd_timeout(osdc); } mutex_unlock(&osdc->request_mutex); } /* * called under osdc->request_mutex */ static void __unregister_request(struct ceph_osd_client *osdc, struct ceph_osd_request *req) { dout("__unregister_request %p tid %lld\n", req, req->r_tid); rb_erase(&req->r_node, &osdc->requests); osdc->num_requests--; if (req->r_osd) { /* make sure the original request isn't in flight. */ ceph_con_revoke(&req->r_osd->o_con, req->r_request); list_del_init(&req->r_osd_item); if (list_empty(&req->r_osd->o_requests)) __move_osd_to_lru(osdc, req->r_osd); req->r_osd = NULL; } ceph_osdc_put_request(req); list_del_init(&req->r_req_lru_item); if (osdc->num_requests == 0) { dout(" no requests, canceling timeout\n"); __cancel_osd_timeout(osdc); } } /* * Cancel a previously queued request message */ static void __cancel_request(struct ceph_osd_request *req) { if (req->r_sent) { ceph_con_revoke(&req->r_osd->o_con, req->r_request); req->r_sent = 0; } list_del_init(&req->r_req_lru_item); } /* * Pick an osd (the first 'up' osd in the pg), allocate the osd struct * (as needed), and set the request r_osd appropriately. If there is * no up osd, set r_osd to NULL. * * Return 0 if unchanged, 1 if changed, or negative on error. * * Caller should hold map_sem for read and request_mutex. */ static int __map_osds(struct ceph_osd_client *osdc, struct ceph_osd_request *req) { struct ceph_osd_request_head *reqhead = req->r_request->front.iov_base; struct ceph_pg pgid; int acting[CEPH_PG_MAX_SIZE]; int o = -1, num = 0; int err; dout("map_osds %p tid %lld\n", req, req->r_tid); err = ceph_calc_object_layout(&reqhead->layout, req->r_oid, &req->r_file_layout, osdc->osdmap); if (err) return err; pgid = reqhead->layout.ol_pgid; req->r_pgid = pgid; err = ceph_calc_pg_acting(osdc->osdmap, pgid, acting); if (err > 0) { o = acting[0]; num = err; } if ((req->r_osd && req->r_osd->o_osd == o && req->r_sent >= req->r_osd->o_incarnation && req->r_num_pg_osds == num && memcmp(req->r_pg_osds, acting, sizeof(acting[0])*num) == 0) || (req->r_osd == NULL && o == -1)) return 0; /* no change */ dout("map_osds tid %llu pgid %d.%x osd%d (was osd%d)\n", req->r_tid, le32_to_cpu(pgid.pool), le16_to_cpu(pgid.ps), o, req->r_osd ? req->r_osd->o_osd : -1); /* record full pg acting set */ memcpy(req->r_pg_osds, acting, sizeof(acting[0]) * num); req->r_num_pg_osds = num; if (req->r_osd) { __cancel_request(req); list_del_init(&req->r_osd_item); req->r_osd = NULL; } req->r_osd = __lookup_osd(osdc, o); if (!req->r_osd && o >= 0) { err = -ENOMEM; req->r_osd = create_osd(osdc); if (!req->r_osd) goto out; dout("map_osds osd %p is osd%d\n", req->r_osd, o); req->r_osd->o_osd = o; req->r_osd->o_con.peer_name.num = cpu_to_le64(o); __insert_osd(osdc, req->r_osd); ceph_con_open(&req->r_osd->o_con, &osdc->osdmap->osd_addr[o]); } if (req->r_osd) { __remove_osd_from_lru(req->r_osd); list_add(&req->r_osd_item, &req->r_osd->o_requests); } err = 1; /* osd or pg changed */ out: return err; } /* * caller should hold map_sem (for read) and request_mutex */ static int __send_request(struct ceph_osd_client *osdc, struct ceph_osd_request *req) { struct ceph_osd_request_head *reqhead; int err; err = __map_osds(osdc, req); if (err < 0) return err; if (req->r_osd == NULL) { dout("send_request %p no up osds in pg\n", req); ceph_monc_request_next_osdmap(&osdc->client->monc); return 0; } dout("send_request %p tid %llu to osd%d flags %d\n", req, req->r_tid, req->r_osd->o_osd, req->r_flags); reqhead = req->r_request->front.iov_base; reqhead->osdmap_epoch = cpu_to_le32(osdc->osdmap->epoch); reqhead->flags |= cpu_to_le32(req->r_flags); /* e.g., RETRY */ reqhead->reassert_version = req->r_reassert_version; req->r_stamp = jiffies; list_move_tail(&osdc->req_lru, &req->r_req_lru_item); ceph_msg_get(req->r_request); /* send consumes a ref */ ceph_con_send(&req->r_osd->o_con, req->r_request); req->r_sent = req->r_osd->o_incarnation; return 0; } /* * Timeout callback, called every N seconds when 1 or more osd * requests has been active for more than N seconds. When this * happens, we ping all OSDs with requests who have timed out to * ensure any communications channel reset is detected. Reset the * request timeouts another N seconds in the future as we go. * Reschedule the timeout event another N seconds in future (unless * there are no open requests). */ static void handle_timeout(struct work_struct *work) { struct ceph_osd_client *osdc = container_of(work, struct ceph_osd_client, timeout_work.work); struct ceph_osd_request *req, *last_req = NULL; struct ceph_osd *osd; unsigned long timeout = osdc->client->mount_args->osd_timeout * HZ; unsigned long keepalive = osdc->client->mount_args->osd_keepalive_timeout * HZ; unsigned long last_stamp = 0; struct rb_node *p; struct list_head slow_osds; dout("timeout\n"); down_read(&osdc->map_sem); ceph_monc_request_next_osdmap(&osdc->client->monc); mutex_lock(&osdc->request_mutex); for (p = rb_first(&osdc->requests); p; p = rb_next(p)) { req = rb_entry(p, struct ceph_osd_request, r_node); if (req->r_resend) { int err; dout("osdc resending prev failed %lld\n", req->r_tid); err = __send_request(osdc, req); if (err) dout("osdc failed again on %lld\n", req->r_tid); else req->r_resend = false; continue; } } /* * reset osds that appear to be _really_ unresponsive. this * is a failsafe measure.. we really shouldn't be getting to * this point if the system is working properly. the monitors * should mark the osd as failed and we should find out about * it from an updated osd map. */ while (timeout && !list_empty(&osdc->req_lru)) { req = list_entry(osdc->req_lru.next, struct ceph_osd_request, r_req_lru_item); if (time_before(jiffies, req->r_stamp + timeout)) break; BUG_ON(req == last_req && req->r_stamp == last_stamp); last_req = req; last_stamp = req->r_stamp; osd = req->r_osd; BUG_ON(!osd); pr_warning(" tid %llu timed out on osd%d, will reset osd\n", req->r_tid, osd->o_osd); __kick_requests(osdc, osd); } /* * ping osds that are a bit slow. this ensures that if there * is a break in the TCP connection we will notice, and reopen * a connection with that osd (from the fault callback). */ INIT_LIST_HEAD(&slow_osds); list_for_each_entry(req, &osdc->req_lru, r_req_lru_item) { if (time_before(jiffies, req->r_stamp + keepalive)) break; osd = req->r_osd; BUG_ON(!osd); dout(" tid %llu is slow, will send keepalive on osd%d\n", req->r_tid, osd->o_osd); list_move_tail(&osd->o_keepalive_item, &slow_osds); } while (!list_empty(&slow_osds)) { osd = list_entry(slow_osds.next, struct ceph_osd, o_keepalive_item); list_del_init(&osd->o_keepalive_item); ceph_con_keepalive(&osd->o_con); } __schedule_osd_timeout(osdc); mutex_unlock(&osdc->request_mutex); up_read(&osdc->map_sem); } static void handle_osds_timeout(struct work_struct *work) { struct ceph_osd_client *osdc = container_of(work, struct ceph_osd_client, osds_timeout_work.work); unsigned long delay = osdc->client->mount_args->osd_idle_ttl * HZ >> 2; dout("osds timeout\n"); down_read(&osdc->map_sem); remove_old_osds(osdc, 0); up_read(&osdc->map_sem); schedule_delayed_work(&osdc->osds_timeout_work, round_jiffies_relative(delay)); } /* * handle osd op reply. either call the callback if it is specified, * or do the completion to wake up the waiting thread. */ static void handle_reply(struct ceph_osd_client *osdc, struct ceph_msg *msg, struct ceph_connection *con) { struct ceph_osd_reply_head *rhead = msg->front.iov_base; struct ceph_osd_request *req; u64 tid; int numops, object_len, flags; s32 result; tid = le64_to_cpu(msg->hdr.tid); if (msg->front.iov_len < sizeof(*rhead)) goto bad; numops = le32_to_cpu(rhead->num_ops); object_len = le32_to_cpu(rhead->object_len); result = le32_to_cpu(rhead->result); if (msg->front.iov_len != sizeof(*rhead) + object_len + numops * sizeof(struct ceph_osd_op)) goto bad; dout("handle_reply %p tid %llu result %d\n", msg, tid, (int)result); /* lookup */ mutex_lock(&osdc->request_mutex); req = __lookup_request(osdc, tid); if (req == NULL) { dout("handle_reply tid %llu dne\n", tid); mutex_unlock(&osdc->request_mutex); return; } ceph_osdc_get_request(req); flags = le32_to_cpu(rhead->flags); /* * if this connection filled our message, drop our reference now, to * avoid a (safe but slower) revoke later. */ if (req->r_con_filling_msg == con && req->r_reply == msg) { dout(" dropping con_filling_msg ref %p\n", con); req->r_con_filling_msg = NULL; ceph_con_put(con); } if (!req->r_got_reply) { unsigned bytes; req->r_result = le32_to_cpu(rhead->result); bytes = le32_to_cpu(msg->hdr.data_len); dout("handle_reply result %d bytes %d\n", req->r_result, bytes); if (req->r_result == 0) req->r_result = bytes; /* in case this is a write and we need to replay, */ req->r_reassert_version = rhead->reassert_version; req->r_got_reply = 1; } else if ((flags & CEPH_OSD_FLAG_ONDISK) == 0) { dout("handle_reply tid %llu dup ack\n", tid); mutex_unlock(&osdc->request_mutex); goto done; } dout("handle_reply tid %llu flags %d\n", tid, flags); /* either this is a read, or we got the safe response */ if (result < 0 || (flags & CEPH_OSD_FLAG_ONDISK) || ((flags & CEPH_OSD_FLAG_WRITE) == 0)) __unregister_request(osdc, req); mutex_unlock(&osdc->request_mutex); if (req->r_callback) req->r_callback(req, msg); else complete(&req->r_completion); if (flags & CEPH_OSD_FLAG_ONDISK) { if (req->r_safe_callback) req->r_safe_callback(req, msg); complete(&req->r_safe_completion); /* fsync waiter */ } done: ceph_osdc_put_request(req); return; bad: pr_err("corrupt osd_op_reply got %d %d expected %d\n", (int)msg->front.iov_len, le32_to_cpu(msg->hdr.front_len), (int)sizeof(*rhead)); ceph_msg_dump(msg); } static int __kick_requests(struct ceph_osd_client *osdc, struct ceph_osd *kickosd) { struct ceph_osd_request *req; struct rb_node *p, *n; int needmap = 0; int err; dout("kick_requests osd%d\n", kickosd ? kickosd->o_osd : -1); if (kickosd) { err = __reset_osd(osdc, kickosd); if (err == -EAGAIN) return 1; } else { for (p = rb_first(&osdc->osds); p; p = n) { struct ceph_osd *osd = rb_entry(p, struct ceph_osd, o_node); n = rb_next(p); if (!ceph_osd_is_up(osdc->osdmap, osd->o_osd) || memcmp(&osd->o_con.peer_addr, ceph_osd_addr(osdc->osdmap, osd->o_osd), sizeof(struct ceph_entity_addr)) != 0) __reset_osd(osdc, osd); } } for (p = rb_first(&osdc->requests); p; p = rb_next(p)) { req = rb_entry(p, struct ceph_osd_request, r_node); if (req->r_resend) { dout(" r_resend set on tid %llu\n", req->r_tid); __cancel_request(req); goto kick; } if (req->r_osd && kickosd == req->r_osd) { __cancel_request(req); goto kick; } err = __map_osds(osdc, req); if (err == 0) continue; /* no change */ if (err < 0) { /* * FIXME: really, we should set the request * error and fail if this isn't a 'nofail' * request, but that's a fair bit more * complicated to do. So retry! */ dout(" setting r_resend on %llu\n", req->r_tid); req->r_resend = true; continue; } if (req->r_osd == NULL) { dout("tid %llu maps to no valid osd\n", req->r_tid); needmap++; /* request a newer map */ continue; } kick: dout("kicking %p tid %llu osd%d\n", req, req->r_tid, req->r_osd ? req->r_osd->o_osd : -1); req->r_flags |= CEPH_OSD_FLAG_RETRY; err = __send_request(osdc, req); if (err) { dout(" setting r_resend on %llu\n", req->r_tid); req->r_resend = true; } } return needmap; } /* * Resubmit osd requests whose osd or osd address has changed. Request * a new osd map if osds are down, or we are otherwise unable to determine * how to direct a request. * * Close connections to down osds. * * If @who is specified, resubmit requests for that specific osd. * * Caller should hold map_sem for read and request_mutex. */ static void kick_requests(struct ceph_osd_client *osdc, struct ceph_osd *kickosd) { int needmap; mutex_lock(&osdc->request_mutex); needmap = __kick_requests(osdc, kickosd); mutex_unlock(&osdc->request_mutex); if (needmap) { dout("%d requests for down osds, need new map\n", needmap); ceph_monc_request_next_osdmap(&osdc->client->monc); } } /* * Process updated osd map. * * The message contains any number of incremental and full maps, normally * indicating some sort of topology change in the cluster. Kick requests * off to different OSDs as needed. */ void ceph_osdc_handle_map(struct ceph_osd_client *osdc, struct ceph_msg *msg) { void *p, *end, *next; u32 nr_maps, maplen; u32 epoch; struct ceph_osdmap *newmap = NULL, *oldmap; int err; struct ceph_fsid fsid; dout("handle_map have %u\n", osdc->osdmap ? osdc->osdmap->epoch : 0); p = msg->front.iov_base; end = p + msg->front.iov_len; /* verify fsid */ ceph_decode_need(&p, end, sizeof(fsid), bad); ceph_decode_copy(&p, &fsid, sizeof(fsid)); if (ceph_check_fsid(osdc->client, &fsid) < 0) return; down_write(&osdc->map_sem); /* incremental maps */ ceph_decode_32_safe(&p, end, nr_maps, bad); dout(" %d inc maps\n", nr_maps); while (nr_maps > 0) { ceph_decode_need(&p, end, 2*sizeof(u32), bad); epoch = ceph_decode_32(&p); maplen = ceph_decode_32(&p); ceph_decode_need(&p, end, maplen, bad); next = p + maplen; if (osdc->osdmap && osdc->osdmap->epoch+1 == epoch) { dout("applying incremental map %u len %d\n", epoch, maplen); newmap = osdmap_apply_incremental(&p, next, osdc->osdmap, osdc->client->msgr); if (IS_ERR(newmap)) { err = PTR_ERR(newmap); goto bad; } BUG_ON(!newmap); if (newmap != osdc->osdmap) { ceph_osdmap_destroy(osdc->osdmap); osdc->osdmap = newmap; } } else { dout("ignoring incremental map %u len %d\n", epoch, maplen); } p = next; nr_maps--; } if (newmap) goto done; /* full maps */ ceph_decode_32_safe(&p, end, nr_maps, bad); dout(" %d full maps\n", nr_maps); while (nr_maps) { ceph_decode_need(&p, end, 2*sizeof(u32), bad); epoch = ceph_decode_32(&p); maplen = ceph_decode_32(&p); ceph_decode_need(&p, end, maplen, bad); if (nr_maps > 1) { dout("skipping non-latest full map %u len %d\n", epoch, maplen); } else if (osdc->osdmap && osdc->osdmap->epoch >= epoch) { dout("skipping full map %u len %d, " "older than our %u\n", epoch, maplen, osdc->osdmap->epoch); } else { dout("taking full map %u len %d\n", epoch, maplen); newmap = osdmap_decode(&p, p+maplen); if (IS_ERR(newmap)) { err = PTR_ERR(newmap); goto bad; } BUG_ON(!newmap); oldmap = osdc->osdmap; osdc->osdmap = newmap; if (oldmap) ceph_osdmap_destroy(oldmap); } p += maplen; nr_maps--; } done: downgrade_write(&osdc->map_sem); ceph_monc_got_osdmap(&osdc->client->monc, osdc->osdmap->epoch); if (newmap) kick_requests(osdc, NULL); up_read(&osdc->map_sem); wake_up(&osdc->client->auth_wq); return; bad: pr_err("osdc handle_map corrupt msg\n"); ceph_msg_dump(msg); up_write(&osdc->map_sem); return; } /* * Register request, send initial attempt. */ int ceph_osdc_start_request(struct ceph_osd_client *osdc, struct ceph_osd_request *req, bool nofail) { int rc = 0; req->r_request->pages = req->r_pages; req->r_request->nr_pages = req->r_num_pages; register_request(osdc, req); down_read(&osdc->map_sem); mutex_lock(&osdc->request_mutex); /* * a racing kick_requests() may have sent the message for us * while we dropped request_mutex above, so only send now if * the request still han't been touched yet. */ if (req->r_sent == 0) { rc = __send_request(osdc, req); if (rc) { if (nofail) { dout("osdc_start_request failed send, " " marking %lld\n", req->r_tid); req->r_resend = true; rc = 0; } else { __unregister_request(osdc, req); } } } mutex_unlock(&osdc->request_mutex); up_read(&osdc->map_sem); return rc; } /* * wait for a request to complete */ int ceph_osdc_wait_request(struct ceph_osd_client *osdc, struct ceph_osd_request *req) { int rc; rc = wait_for_completion_interruptible(&req->r_completion); if (rc < 0) { mutex_lock(&osdc->request_mutex); __cancel_request(req); __unregister_request(osdc, req); mutex_unlock(&osdc->request_mutex); dout("wait_request tid %llu canceled/timed out\n", req->r_tid); return rc; } dout("wait_request tid %llu result %d\n", req->r_tid, req->r_result); return req->r_result; } /* * sync - wait for all in-flight requests to flush. avoid starvation. */ void ceph_osdc_sync(struct ceph_osd_client *osdc) { struct ceph_osd_request *req; u64 last_tid, next_tid = 0; mutex_lock(&osdc->request_mutex); last_tid = osdc->last_tid; while (1) { req = __lookup_request_ge(osdc, next_tid); if (!req) break; if (req->r_tid > last_tid) break; next_tid = req->r_tid + 1; if ((req->r_flags & CEPH_OSD_FLAG_WRITE) == 0) continue; ceph_osdc_get_request(req); mutex_unlock(&osdc->request_mutex); dout("sync waiting on tid %llu (last is %llu)\n", req->r_tid, last_tid); wait_for_completion(&req->r_safe_completion); mutex_lock(&osdc->request_mutex); ceph_osdc_put_request(req); } mutex_unlock(&osdc->request_mutex); dout("sync done (thru tid %llu)\n", last_tid); } /* * init, shutdown */ int ceph_osdc_init(struct ceph_osd_client *osdc, struct ceph_client *client) { int err; dout("init\n"); osdc->client = client; osdc->osdmap = NULL; init_rwsem(&osdc->map_sem); init_completion(&osdc->map_waiters); osdc->last_requested_map = 0; mutex_init(&osdc->request_mutex); osdc->last_tid = 0; osdc->osds = RB_ROOT; INIT_LIST_HEAD(&osdc->osd_lru); osdc->requests = RB_ROOT; INIT_LIST_HEAD(&osdc->req_lru); osdc->num_requests = 0; INIT_DELAYED_WORK(&osdc->timeout_work, handle_timeout); INIT_DELAYED_WORK(&osdc->osds_timeout_work, handle_osds_timeout); schedule_delayed_work(&osdc->osds_timeout_work, round_jiffies_relative(osdc->client->mount_args->osd_idle_ttl * HZ)); err = -ENOMEM; osdc->req_mempool = mempool_create_kmalloc_pool(10, sizeof(struct ceph_osd_request)); if (!osdc->req_mempool) goto out; err = ceph_msgpool_init(&osdc->msgpool_op, OSD_OP_FRONT_LEN, 10, true, "osd_op"); if (err < 0) goto out_mempool; err = ceph_msgpool_init(&osdc->msgpool_op_reply, OSD_OPREPLY_FRONT_LEN, 10, true, "osd_op_reply"); if (err < 0) goto out_msgpool; return 0; out_msgpool: ceph_msgpool_destroy(&osdc->msgpool_op); out_mempool: mempool_destroy(osdc->req_mempool); out: return err; } void ceph_osdc_stop(struct ceph_osd_client *osdc) { cancel_delayed_work_sync(&osdc->timeout_work); cancel_delayed_work_sync(&osdc->osds_timeout_work); if (osdc->osdmap) { ceph_osdmap_destroy(osdc->osdmap); osdc->osdmap = NULL; } remove_old_osds(osdc, 1); mempool_destroy(osdc->req_mempool); ceph_msgpool_destroy(&osdc->msgpool_op); ceph_msgpool_destroy(&osdc->msgpool_op_reply); } /* * Read some contiguous pages. If we cross a stripe boundary, shorten * *plen. Return number of bytes read, or error. */ int ceph_osdc_readpages(struct ceph_osd_client *osdc, struct ceph_vino vino, struct ceph_file_layout *layout, u64 off, u64 *plen, u32 truncate_seq, u64 truncate_size, struct page **pages, int num_pages) { struct ceph_osd_request *req; int rc = 0; dout("readpages on ino %llx.%llx on %llu~%llu\n", vino.ino, vino.snap, off, *plen); req = ceph_osdc_new_request(osdc, layout, vino, off, plen, CEPH_OSD_OP_READ, CEPH_OSD_FLAG_READ, NULL, 0, truncate_seq, truncate_size, NULL, false, 1); if (!req) return -ENOMEM; /* it may be a short read due to an object boundary */ req->r_pages = pages; num_pages = calc_pages_for(off, *plen); req->r_num_pages = num_pages; dout("readpages final extent is %llu~%llu (%d pages)\n", off, *plen, req->r_num_pages); rc = ceph_osdc_start_request(osdc, req, false); if (!rc) rc = ceph_osdc_wait_request(osdc, req); ceph_osdc_put_request(req); dout("readpages result %d\n", rc); return rc; } /* * do a synchronous write on N pages */ int ceph_osdc_writepages(struct ceph_osd_client *osdc, struct ceph_vino vino, struct ceph_file_layout *layout, struct ceph_snap_context *snapc, u64 off, u64 len, u32 truncate_seq, u64 truncate_size, struct timespec *mtime, struct page **pages, int num_pages, int flags, int do_sync, bool nofail) { struct ceph_osd_request *req; int rc = 0; BUG_ON(vino.snap != CEPH_NOSNAP); req = ceph_osdc_new_request(osdc, layout, vino, off, &len, CEPH_OSD_OP_WRITE, flags | CEPH_OSD_FLAG_ONDISK | CEPH_OSD_FLAG_WRITE, snapc, do_sync, truncate_seq, truncate_size, mtime, nofail, 1); if (!req) return -ENOMEM; /* it may be a short write due to an object boundary */ req->r_pages = pages; req->r_num_pages = calc_pages_for(off, len); dout("writepages %llu~%llu (%d pages)\n", off, len, req->r_num_pages); rc = ceph_osdc_start_request(osdc, req, nofail); if (!rc) rc = ceph_osdc_wait_request(osdc, req); ceph_osdc_put_request(req); if (rc == 0) rc = len; dout("writepages result %d\n", rc); return rc; } /* * handle incoming message */ static void dispatch(struct ceph_connection *con, struct ceph_msg *msg) { struct ceph_osd *osd = con->private; struct ceph_osd_client *osdc; int type = le16_to_cpu(msg->hdr.type); if (!osd) return; osdc = osd->o_osdc; switch (type) { case CEPH_MSG_OSD_MAP: ceph_osdc_handle_map(osdc, msg); break; case CEPH_MSG_OSD_OPREPLY: handle_reply(osdc, msg, con); break; default: pr_err("received unknown message type %d %s\n", type, ceph_msg_type_name(type)); } ceph_msg_put(msg); } /* * lookup and return message for incoming reply. set up reply message * pages. */ static struct ceph_msg *get_reply(struct ceph_connection *con, struct ceph_msg_header *hdr, int *skip) { struct ceph_osd *osd = con->private; struct ceph_osd_client *osdc = osd->o_osdc; struct ceph_msg *m; struct ceph_osd_request *req; int front = le32_to_cpu(hdr->front_len); int data_len = le32_to_cpu(hdr->data_len); u64 tid; tid = le64_to_cpu(hdr->tid); mutex_lock(&osdc->request_mutex); req = __lookup_request(osdc, tid); if (!req) { *skip = 1; m = NULL; pr_info("get_reply unknown tid %llu from osd%d\n", tid, osd->o_osd); goto out; } if (req->r_con_filling_msg) { dout("get_reply revoking msg %p from old con %p\n", req->r_reply, req->r_con_filling_msg); ceph_con_revoke_message(req->r_con_filling_msg, req->r_reply); ceph_con_put(req->r_con_filling_msg); req->r_con_filling_msg = NULL; } if (front > req->r_reply->front.iov_len) { pr_warning("get_reply front %d > preallocated %d\n", front, (int)req->r_reply->front.iov_len); m = ceph_msg_new(CEPH_MSG_OSD_OPREPLY, front, GFP_NOFS); if (!m) goto out; ceph_msg_put(req->r_reply); req->r_reply = m; } m = ceph_msg_get(req->r_reply); if (data_len > 0) { unsigned data_off = le16_to_cpu(hdr->data_off); int want = calc_pages_for(data_off & ~PAGE_MASK, data_len); if (unlikely(req->r_num_pages < want)) { pr_warning("tid %lld reply %d > expected %d pages\n", tid, want, m->nr_pages); *skip = 1; ceph_msg_put(m); m = NULL; goto out; } m->pages = req->r_pages; m->nr_pages = req->r_num_pages; } *skip = 0; req->r_con_filling_msg = ceph_con_get(con); dout("get_reply tid %lld %p\n", tid, m); out: mutex_unlock(&osdc->request_mutex); return m; } static struct ceph_msg *alloc_msg(struct ceph_connection *con, struct ceph_msg_header *hdr, int *skip) { struct ceph_osd *osd = con->private; int type = le16_to_cpu(hdr->type); int front = le32_to_cpu(hdr->front_len); switch (type) { case CEPH_MSG_OSD_MAP: return ceph_msg_new(type, front, GFP_NOFS); case CEPH_MSG_OSD_OPREPLY: return get_reply(con, hdr, skip); default: pr_info("alloc_msg unexpected msg type %d from osd%d\n", type, osd->o_osd); *skip = 1; return NULL; } } /* * Wrappers to refcount containing ceph_osd struct */ static struct ceph_connection *get_osd_con(struct ceph_connection *con) { struct ceph_osd *osd = con->private; if (get_osd(osd)) return con; return NULL; } static void put_osd_con(struct ceph_connection *con) { struct ceph_osd *osd = con->private; put_osd(osd); } /* * authentication */ static int get_authorizer(struct ceph_connection *con, void **buf, int *len, int *proto, void **reply_buf, int *reply_len, int force_new) { struct ceph_osd *o = con->private; struct ceph_osd_client *osdc = o->o_osdc; struct ceph_auth_client *ac = osdc->client->monc.auth; int ret = 0; if (force_new && o->o_authorizer) { ac->ops->destroy_authorizer(ac, o->o_authorizer); o->o_authorizer = NULL; } if (o->o_authorizer == NULL) { ret = ac->ops->create_authorizer( ac, CEPH_ENTITY_TYPE_OSD, &o->o_authorizer, &o->o_authorizer_buf, &o->o_authorizer_buf_len, &o->o_authorizer_reply_buf, &o->o_authorizer_reply_buf_len); if (ret) return ret; } *proto = ac->protocol; *buf = o->o_authorizer_buf; *len = o->o_authorizer_buf_len; *reply_buf = o->o_authorizer_reply_buf; *reply_len = o->o_authorizer_reply_buf_len; return 0; } static int verify_authorizer_reply(struct ceph_connection *con, int len) { struct ceph_osd *o = con->private; struct ceph_osd_client *osdc = o->o_osdc; struct ceph_auth_client *ac = osdc->client->monc.auth; return ac->ops->verify_authorizer_reply(ac, o->o_authorizer, len); } static int invalidate_authorizer(struct ceph_connection *con) { struct ceph_osd *o = con->private; struct ceph_osd_client *osdc = o->o_osdc; struct ceph_auth_client *ac = osdc->client->monc.auth; if (ac->ops->invalidate_authorizer) ac->ops->invalidate_authorizer(ac, CEPH_ENTITY_TYPE_OSD); return ceph_monc_validate_auth(&osdc->client->monc); } static const struct ceph_connection_operations osd_con_ops = { .get = get_osd_con, .put = put_osd_con, .dispatch = dispatch, .get_authorizer = get_authorizer, .verify_authorizer_reply = verify_authorizer_reply, .invalidate_authorizer = invalidate_authorizer, .alloc_msg = alloc_msg, .fault = osd_reset, };