#include <linux/ceph/ceph_debug.h> #include <linux/module.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> #ifdef CONFIG_BLOCK #include <linux/bio.h> #endif #include <linux/ceph/libceph.h> #include <linux/ceph/osd_client.h> #include <linux/ceph/messenger.h> #include <linux/ceph/decode.h> #include <linux/ceph/auth.h> #include <linux/ceph/pagelist.h> #define OSD_OP_FRONT_LEN 4096 #define OSD_OPREPLY_FRONT_LEN 512 static const struct ceph_connection_operations osd_con_ops; static void send_queued(struct ceph_osd_client *osdc); static int __reset_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd); static void __register_request(struct ceph_osd_client *osdc, struct ceph_osd_request *req); static void __unregister_linger_request(struct ceph_osd_client *osdc, struct ceph_osd_request *req); static void __send_request(struct ceph_osd_client *osdc, struct ceph_osd_request *req); static int op_needs_trail(int op) { switch (op) { case CEPH_OSD_OP_GETXATTR: case CEPH_OSD_OP_SETXATTR: case CEPH_OSD_OP_CMPXATTR: case CEPH_OSD_OP_CALL: case CEPH_OSD_OP_NOTIFY: return 1; default: return 0; } } static int op_has_extent(int op) { return (op == CEPH_OSD_OP_READ || op == CEPH_OSD_OP_WRITE); } void ceph_calc_raw_layout(struct ceph_osd_client *osdc, struct ceph_file_layout *layout, u64 snapid, u64 off, u64 *plen, u64 *bno, struct ceph_osd_request *req, struct ceph_osd_req_op *op) { struct ceph_osd_request_head *reqhead = req->r_request->front.iov_base; u64 orig_len = *plen; u64 objoff, objlen; /* extent in object */ reqhead->snapid = cpu_to_le64(snapid); /* 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); if (op_has_extent(op->op)) { op->extent.offset = objoff; op->extent.length = objlen; } req->r_num_pages = calc_pages_for(off, *plen); req->r_page_alignment = off & ~PAGE_MASK; if (op->op == CEPH_OSD_OP_WRITE) op->payload_len = *plen; dout("calc_layout bno=%llx %llu~%llu (%d pages)\n", *bno, objoff, objlen, req->r_num_pages); } EXPORT_SYMBOL(ceph_calc_raw_layout); /* * 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_req_op *op) { u64 bno; ceph_calc_raw_layout(osdc, layout, vino.snap, off, plen, &bno, req, op); snprintf(req->r_oid, sizeof(req->r_oid), "%llx.%08llx", vino.ino, bno); req->r_oid_len = strlen(req->r_oid); } /* * 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); #ifdef CONFIG_BLOCK if (req->r_bio) bio_put(req->r_bio); #endif ceph_put_snap_context(req->r_snapc); if (req->r_trail) { ceph_pagelist_release(req->r_trail); kfree(req->r_trail); } if (req->r_mempool) mempool_free(req, req->r_osdc->req_mempool); else kfree(req); } EXPORT_SYMBOL(ceph_osdc_release_request); static int get_num_ops(struct ceph_osd_req_op *ops, int *needs_trail) { int i = 0; if (needs_trail) *needs_trail = 0; while (ops[i].op) { if (needs_trail && op_needs_trail(ops[i].op)) *needs_trail = 1; i++; } return i; } struct ceph_osd_request *ceph_osdc_alloc_request(struct ceph_osd_client *osdc, int flags, struct ceph_snap_context *snapc, struct ceph_osd_req_op *ops, bool use_mempool, gfp_t gfp_flags, struct page **pages, struct bio *bio) { struct ceph_osd_request *req; struct ceph_msg *msg; int needs_trail; int num_op = get_num_ops(ops, &needs_trail); size_t msg_size = sizeof(struct ceph_osd_request_head); msg_size += num_op*sizeof(struct ceph_osd_op); if (use_mempool) { req = mempool_alloc(osdc->req_mempool, gfp_flags); memset(req, 0, sizeof(*req)); } else { req = kzalloc(sizeof(*req), gfp_flags); } 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); INIT_LIST_HEAD(&req->r_linger_item); INIT_LIST_HEAD(&req->r_linger_osd); INIT_LIST_HEAD(&req->r_req_lru_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_flags, true); if (!msg) { ceph_osdc_put_request(req); return NULL; } req->r_reply = msg; /* allocate space for the trailing data */ if (needs_trail) { req->r_trail = kmalloc(sizeof(struct ceph_pagelist), gfp_flags); if (!req->r_trail) { ceph_osdc_put_request(req); return NULL; } ceph_pagelist_init(req->r_trail); } /* create request message; allow space for oid */ msg_size += MAX_OBJ_NAME_SIZE; 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_flags, true); 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); req->r_request = msg; req->r_pages = pages; #ifdef CONFIG_BLOCK if (bio) { req->r_bio = bio; bio_get(req->r_bio); } #endif return req; } EXPORT_SYMBOL(ceph_osdc_alloc_request); static void osd_req_encode_op(struct ceph_osd_request *req, struct ceph_osd_op *dst, struct ceph_osd_req_op *src) { dst->op = cpu_to_le16(src->op); switch (dst->op) { case CEPH_OSD_OP_READ: case CEPH_OSD_OP_WRITE: dst->extent.offset = cpu_to_le64(src->extent.offset); dst->extent.length = cpu_to_le64(src->extent.length); dst->extent.truncate_size = cpu_to_le64(src->extent.truncate_size); dst->extent.truncate_seq = cpu_to_le32(src->extent.truncate_seq); break; case CEPH_OSD_OP_GETXATTR: case CEPH_OSD_OP_SETXATTR: case CEPH_OSD_OP_CMPXATTR: BUG_ON(!req->r_trail); dst->xattr.name_len = cpu_to_le32(src->xattr.name_len); dst->xattr.value_len = cpu_to_le32(src->xattr.value_len); dst->xattr.cmp_op = src->xattr.cmp_op; dst->xattr.cmp_mode = src->xattr.cmp_mode; ceph_pagelist_append(req->r_trail, src->xattr.name, src->xattr.name_len); ceph_pagelist_append(req->r_trail, src->xattr.val, src->xattr.value_len); break; case CEPH_OSD_OP_CALL: BUG_ON(!req->r_trail); dst->cls.class_len = src->cls.class_len; dst->cls.method_len = src->cls.method_len; dst->cls.indata_len = cpu_to_le32(src->cls.indata_len); ceph_pagelist_append(req->r_trail, src->cls.class_name, src->cls.class_len); ceph_pagelist_append(req->r_trail, src->cls.method_name, src->cls.method_len); ceph_pagelist_append(req->r_trail, src->cls.indata, src->cls.indata_len); break; case CEPH_OSD_OP_ROLLBACK: dst->snap.snapid = cpu_to_le64(src->snap.snapid); break; case CEPH_OSD_OP_STARTSYNC: break; case CEPH_OSD_OP_NOTIFY: { __le32 prot_ver = cpu_to_le32(src->watch.prot_ver); __le32 timeout = cpu_to_le32(src->watch.timeout); BUG_ON(!req->r_trail); ceph_pagelist_append(req->r_trail, &prot_ver, sizeof(prot_ver)); ceph_pagelist_append(req->r_trail, &timeout, sizeof(timeout)); } case CEPH_OSD_OP_NOTIFY_ACK: case CEPH_OSD_OP_WATCH: dst->watch.cookie = cpu_to_le64(src->watch.cookie); dst->watch.ver = cpu_to_le64(src->watch.ver); dst->watch.flag = src->watch.flag; break; default: pr_err("unrecognized osd opcode %d\n", dst->op); WARN_ON(1); break; } dst->payload_len = cpu_to_le32(src->payload_len); } /* * build new request AND message * */ void ceph_osdc_build_request(struct ceph_osd_request *req, u64 off, u64 *plen, struct ceph_osd_req_op *src_ops, struct ceph_snap_context *snapc, struct timespec *mtime, const char *oid, int oid_len) { struct ceph_msg *msg = req->r_request; struct ceph_osd_request_head *head; struct ceph_osd_req_op *src_op; struct ceph_osd_op *op; void *p; int num_op = get_num_ops(src_ops, NULL); size_t msg_size = sizeof(*head) + num_op*sizeof(*op); int flags = req->r_flags; u64 data_len = 0; int i; head = msg->front.iov_base; op = (void *)(head + 1); p = (void *)(op + num_op); 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); /* fill in oid */ head->object_len = cpu_to_le32(oid_len); memcpy(p, oid, oid_len); p += oid_len; src_op = src_ops; while (src_op->op) { osd_req_encode_op(req, op, src_op); src_op++; op++; } if (req->r_trail) data_len += req->r_trail->length; 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); } } 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 + data_len); } else if (data_len) { req->r_request->hdr.data_off = 0; req->r_request->hdr.data_len = cpu_to_le32(data_len); } req->r_request->page_alignment = req->r_page_alignment; 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; } EXPORT_SYMBOL(ceph_osdc_build_request); /* * 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, int page_align) { struct ceph_osd_req_op ops[3]; struct ceph_osd_request *req; ops[0].op = opcode; ops[0].extent.truncate_seq = truncate_seq; ops[0].extent.truncate_size = truncate_size; ops[0].payload_len = 0; if (do_sync) { ops[1].op = CEPH_OSD_OP_STARTSYNC; ops[1].payload_len = 0; ops[2].op = 0; } else ops[1].op = 0; req = ceph_osdc_alloc_request(osdc, flags, snapc, ops, use_mempool, GFP_NOFS, NULL, NULL); if (!req) return NULL; /* calculate max write size */ calc_layout(osdc, vino, layout, off, plen, req, ops); req->r_file_layout = *layout; /* keep a copy */ /* in case it differs from natural (file) alignment that calc_layout filled in for us */ req->r_num_pages = calc_pages_for(page_align, *plen); req->r_page_alignment = page_align; ceph_osdc_build_request(req, off, plen, ops, snapc, mtime, req->r_oid, req->r_oid_len); return req; } EXPORT_SYMBOL(ceph_osdc_new_request); /* * 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; } /* * Resubmit requests pending on the given osd. */ static void __kick_osd_requests(struct ceph_osd_client *osdc, struct ceph_osd *osd) { struct ceph_osd_request *req, *nreq; int err; dout("__kick_osd_requests osd%d\n", osd->o_osd); err = __reset_osd(osdc, osd); if (err == -EAGAIN) return; list_for_each_entry(req, &osd->o_requests, r_osd_item) { list_move(&req->r_req_lru_item, &osdc->req_unsent); dout("requeued %p tid %llu osd%d\n", req, req->r_tid, osd->o_osd); if (!req->r_linger) req->r_flags |= CEPH_OSD_FLAG_RETRY; } list_for_each_entry_safe(req, nreq, &osd->o_linger_requests, r_linger_osd) { /* * reregister request prior to unregistering linger so * that r_osd is preserved. */ BUG_ON(!list_empty(&req->r_req_lru_item)); __register_request(osdc, req); list_add(&req->r_req_lru_item, &osdc->req_unsent); list_add(&req->r_osd_item, &req->r_osd->o_requests); __unregister_linger_request(osdc, req); dout("requeued lingering %p tid %llu osd%d\n", req, req->r_tid, osd->o_osd); } } static void kick_osd_requests(struct ceph_osd_client *osdc, struct ceph_osd *kickosd) { mutex_lock(&osdc->request_mutex); __kick_osd_requests(osdc, kickosd); mutex_unlock(&osdc->request_mutex); } /* * If the osd connection drops, we need to resubmit all requests. */ 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_osd_requests(osdc, osd); send_queued(osdc); 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_linger_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 remove_all_osds(struct ceph_osd_client *osdc) { dout("__remove_old_osds %p\n", osdc); mutex_lock(&osdc->request_mutex); while (!RB_EMPTY_ROOT(&osdc->osds)) { struct ceph_osd *osd = rb_entry(rb_first(&osdc->osds), struct ceph_osd, o_node); __remove_osd(osdc, osd); } mutex_unlock(&osdc->request_mutex); } 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->options->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) { 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 (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) && list_empty(&osd->o_linger_requests)) { __remove_osd(osdc, osd); } else if (memcmp(&osdc->osdmap->osd_addr[osd->o_osd], &osd->o_con.peer_addr, 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; dout("__insert_osd %p osd%d\n", new, new->o_osd); 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->options->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) { req->r_tid = ++osdc->last_tid; req->r_request->hdr.tid = cpu_to_le64(req->r_tid); dout("__register_request %p tid %lld\n", req, req->r_tid); __insert_request(osdc, req); ceph_osdc_get_request(req); osdc->num_requests++; if (osdc->num_requests == 1) { dout(" first request, scheduling timeout\n"); __schedule_osd_timeout(osdc); } } static void register_request(struct ceph_osd_client *osdc, struct ceph_osd_request *req) { mutex_lock(&osdc->request_mutex); __register_request(osdc, req); mutex_unlock(&osdc->request_mutex); } /* * 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) && list_empty(&req->r_osd->o_linger_requests)) { dout("moving osd to %p lru\n", req->r_osd); __move_osd_to_lru(osdc, req->r_osd); } if (list_empty(&req->r_linger_item)) 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 && req->r_osd) { ceph_con_revoke(&req->r_osd->o_con, req->r_request); req->r_sent = 0; } } static void __register_linger_request(struct ceph_osd_client *osdc, struct ceph_osd_request *req) { dout("__register_linger_request %p\n", req); list_add_tail(&req->r_linger_item, &osdc->req_linger); list_add_tail(&req->r_linger_osd, &req->r_osd->o_linger_requests); } static void __unregister_linger_request(struct ceph_osd_client *osdc, struct ceph_osd_request *req) { dout("__unregister_linger_request %p\n", req); if (req->r_osd) { list_del_init(&req->r_linger_item); list_del_init(&req->r_linger_osd); if (list_empty(&req->r_osd->o_requests) && list_empty(&req->r_osd->o_linger_requests)) { dout("moving osd to %p lru\n", req->r_osd); __move_osd_to_lru(osdc, req->r_osd); } if (list_empty(&req->r_osd_item)) req->r_osd = NULL; } } void ceph_osdc_unregister_linger_request(struct ceph_osd_client *osdc, struct ceph_osd_request *req) { mutex_lock(&osdc->request_mutex); if (req->r_linger) { __unregister_linger_request(osdc, req); ceph_osdc_put_request(req); } mutex_unlock(&osdc->request_mutex); } EXPORT_SYMBOL(ceph_osdc_unregister_linger_request); void ceph_osdc_set_request_linger(struct ceph_osd_client *osdc, struct ceph_osd_request *req) { if (!req->r_linger) { dout("set_request_linger %p\n", req); req->r_linger = 1; /* * caller is now responsible for calling * unregister_linger_request */ ceph_osdc_get_request(req); } } EXPORT_SYMBOL(ceph_osdc_set_request_linger); /* * Pick an osd (the first 'up' osd in the pg), allocate the osd struct * (as needed), and set the request r_osd appropriately. If there is * no up osd, set r_osd to NULL. Move the request to the appropriate list * (unsent, homeless) or leave on in-flight lru. * * Return 0 if unchanged, 1 if changed, or negative on error. * * Caller should hold map_sem for read and request_mutex. */ static int __map_request(struct ceph_osd_client *osdc, struct ceph_osd_request *req, int force_resend) { 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_request %p tid %lld\n", req, req->r_tid); err = ceph_calc_object_layout(&reqhead->layout, req->r_oid, &req->r_file_layout, osdc->osdmap); if (err) { list_move(&req->r_req_lru_item, &osdc->req_notarget); 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 ((!force_resend && 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_request tid %llu pgid %d.%x osd%d (was osd%d)\n", req->r_tid, le32_to_cpu(pgid.pool), le16_to_cpu(pgid.ps), o, req->r_osd ? req->r_osd->o_osd : -1); /* 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) { list_move(&req->r_req_lru_item, &osdc->req_notarget); goto out; } dout("map_request osd %p is osd%d\n", req->r_osd, o); req->r_osd->o_osd = o; req->r_osd->o_con.peer_name.num = cpu_to_le64(o); __insert_osd(osdc, req->r_osd); 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); list_move(&req->r_req_lru_item, &osdc->req_unsent); } else { list_move(&req->r_req_lru_item, &osdc->req_notarget); } err = 1; /* osd or pg changed */ out: return err; } /* * caller should hold map_sem (for read) and request_mutex */ static void __send_request(struct ceph_osd_client *osdc, struct ceph_osd_request *req) { struct ceph_osd_request_head *reqhead; 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(&req->r_req_lru_item, &osdc->req_lru); 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; } /* * Send any requests in the queue (req_unsent). */ static void send_queued(struct ceph_osd_client *osdc) { struct ceph_osd_request *req, *tmp; dout("send_queued\n"); mutex_lock(&osdc->request_mutex); list_for_each_entry_safe(req, tmp, &osdc->req_unsent, r_req_lru_item) { __send_request(osdc, req); } mutex_unlock(&osdc->request_mutex); } /* * Timeout callback, called every N seconds when 1 or more osd * requests has been active for more than N seconds. When this * happens, we ping all OSDs with requests who have timed out to * 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->options->osd_timeout * HZ; unsigned long keepalive = osdc->client->options->osd_keepalive_timeout * HZ; unsigned long last_stamp = 0; 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); /* * 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); /* hasn't been long enough since we sent it? */ if (time_before(jiffies, req->r_stamp + timeout)) break; /* hasn't been long enough since it was acked? */ if (req->r_request->ack_stamp == 0 || time_before(jiffies, req->r_request->ack_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_osd_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); send_queued(osdc); 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->options->osd_idle_ttl * HZ >> 2; dout("osds timeout\n"); down_read(&osdc->map_sem); remove_old_osds(osdc); up_read(&osdc->map_sem); schedule_delayed_work(&osdc->osds_timeout_work, round_jiffies_relative(delay)); } static void complete_request(struct ceph_osd_request *req) { if (req->r_safe_callback) req->r_safe_callback(req, NULL); complete_all(&req->r_safe_completion); /* fsync waiter */ } /* * 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); if (req->r_linger && (flags & CEPH_OSD_FLAG_ONDISK)) __register_linger_request(osdc, req); /* either this is a read, or we got the safe response */ if (result < 0 || (flags & CEPH_OSD_FLAG_ONDISK) || ((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_all(&req->r_completion); if (flags & CEPH_OSD_FLAG_ONDISK) complete_request(req); done: dout("req=%p req->r_linger=%d\n", req, req->r_linger); 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 void reset_changed_osds(struct ceph_osd_client *osdc) { struct rb_node *p, *n; for (p = rb_first(&osdc->osds); p; p = n) { struct ceph_osd *osd = rb_entry(p, struct ceph_osd, o_node); n = rb_next(p); if (!ceph_osd_is_up(osdc->osdmap, osd->o_osd) || memcmp(&osd->o_con.peer_addr, ceph_osd_addr(osdc->osdmap, osd->o_osd), sizeof(struct ceph_entity_addr)) != 0) __reset_osd(osdc, osd); } } /* * Requeue requests whose mapping to an OSD has changed. If requests map to * no osd, request a new map. * * Caller should hold map_sem for read and request_mutex. */ static void kick_requests(struct ceph_osd_client *osdc, int force_resend) { struct ceph_osd_request *req, *nreq; struct rb_node *p; int needmap = 0; int err; dout("kick_requests %s\n", force_resend ? " (force resend)" : ""); 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); err = __map_request(osdc, req, force_resend); if (err < 0) continue; /* error */ if (req->r_osd == NULL) { dout("%p tid %llu maps to no osd\n", req, req->r_tid); needmap++; /* request a newer map */ } else if (err > 0) { dout("%p tid %llu requeued on osd%d\n", req, req->r_tid, req->r_osd ? req->r_osd->o_osd : -1); if (!req->r_linger) req->r_flags |= CEPH_OSD_FLAG_RETRY; } } list_for_each_entry_safe(req, nreq, &osdc->req_linger, r_linger_item) { dout("linger req=%p req->r_osd=%p\n", req, req->r_osd); err = __map_request(osdc, req, force_resend); if (err == 0) continue; /* no change and no osd was specified */ if (err < 0) continue; /* hrm! */ if (req->r_osd == NULL) { dout("tid %llu maps to no valid osd\n", req->r_tid); needmap++; /* request a newer map */ continue; } dout("kicking lingering %p tid %llu osd%d\n", req, req->r_tid, req->r_osd ? req->r_osd->o_osd : -1); __unregister_linger_request(osdc, req); __register_request(osdc, req); } 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; } kick_requests(osdc, 0); reset_changed_osds(osdc); } 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 { int skipped_map = 0; 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) { if (oldmap->epoch + 1 < newmap->epoch) skipped_map = 1; ceph_osdmap_destroy(oldmap); } kick_requests(osdc, skipped_map); } p += maplen; nr_maps--; } done: downgrade_write(&osdc->map_sem); ceph_monc_got_osdmap(&osdc->client->monc, osdc->osdmap->epoch); /* * subscribe to subsequent osdmap updates if full to ensure * we find out when we are no longer full and stop returning * ENOSPC. */ if (ceph_osdmap_flag(osdc->osdmap, CEPH_OSDMAP_FULL)) ceph_monc_request_next_osdmap(&osdc->client->monc); send_queued(osdc); up_read(&osdc->map_sem); wake_up_all(&osdc->client->auth_wq); return; bad: pr_err("osdc handle_map corrupt msg\n"); ceph_msg_dump(msg); up_write(&osdc->map_sem); return; } /* * watch/notify callback event infrastructure * * These callbacks are used both for watch and notify operations. */ static void __release_event(struct kref *kref) { struct ceph_osd_event *event = container_of(kref, struct ceph_osd_event, kref); dout("__release_event %p\n", event); kfree(event); } static void get_event(struct ceph_osd_event *event) { kref_get(&event->kref); } void ceph_osdc_put_event(struct ceph_osd_event *event) { kref_put(&event->kref, __release_event); } EXPORT_SYMBOL(ceph_osdc_put_event); static void __insert_event(struct ceph_osd_client *osdc, struct ceph_osd_event *new) { struct rb_node **p = &osdc->event_tree.rb_node; struct rb_node *parent = NULL; struct ceph_osd_event *event = NULL; while (*p) { parent = *p; event = rb_entry(parent, struct ceph_osd_event, node); if (new->cookie < event->cookie) p = &(*p)->rb_left; else if (new->cookie > event->cookie) p = &(*p)->rb_right; else BUG(); } rb_link_node(&new->node, parent, p); rb_insert_color(&new->node, &osdc->event_tree); } static struct ceph_osd_event *__find_event(struct ceph_osd_client *osdc, u64 cookie) { struct rb_node **p = &osdc->event_tree.rb_node; struct rb_node *parent = NULL; struct ceph_osd_event *event = NULL; while (*p) { parent = *p; event = rb_entry(parent, struct ceph_osd_event, node); if (cookie < event->cookie) p = &(*p)->rb_left; else if (cookie > event->cookie) p = &(*p)->rb_right; else return event; } return NULL; } static void __remove_event(struct ceph_osd_event *event) { struct ceph_osd_client *osdc = event->osdc; if (!RB_EMPTY_NODE(&event->node)) { dout("__remove_event removed %p\n", event); rb_erase(&event->node, &osdc->event_tree); ceph_osdc_put_event(event); } else { dout("__remove_event didn't remove %p\n", event); } } int ceph_osdc_create_event(struct ceph_osd_client *osdc, void (*event_cb)(u64, u64, u8, void *), int one_shot, void *data, struct ceph_osd_event **pevent) { struct ceph_osd_event *event; event = kmalloc(sizeof(*event), GFP_NOIO); if (!event) return -ENOMEM; dout("create_event %p\n", event); event->cb = event_cb; event->one_shot = one_shot; event->data = data; event->osdc = osdc; INIT_LIST_HEAD(&event->osd_node); kref_init(&event->kref); /* one ref for us */ kref_get(&event->kref); /* one ref for the caller */ init_completion(&event->completion); spin_lock(&osdc->event_lock); event->cookie = ++osdc->event_count; __insert_event(osdc, event); spin_unlock(&osdc->event_lock); *pevent = event; return 0; } EXPORT_SYMBOL(ceph_osdc_create_event); void ceph_osdc_cancel_event(struct ceph_osd_event *event) { struct ceph_osd_client *osdc = event->osdc; dout("cancel_event %p\n", event); spin_lock(&osdc->event_lock); __remove_event(event); spin_unlock(&osdc->event_lock); ceph_osdc_put_event(event); /* caller's */ } EXPORT_SYMBOL(ceph_osdc_cancel_event); static void do_event_work(struct work_struct *work) { struct ceph_osd_event_work *event_work = container_of(work, struct ceph_osd_event_work, work); struct ceph_osd_event *event = event_work->event; u64 ver = event_work->ver; u64 notify_id = event_work->notify_id; u8 opcode = event_work->opcode; dout("do_event_work completing %p\n", event); event->cb(ver, notify_id, opcode, event->data); complete(&event->completion); dout("do_event_work completed %p\n", event); ceph_osdc_put_event(event); kfree(event_work); } /* * Process osd watch notifications */ void handle_watch_notify(struct ceph_osd_client *osdc, struct ceph_msg *msg) { void *p, *end; u8 proto_ver; u64 cookie, ver, notify_id; u8 opcode; struct ceph_osd_event *event; struct ceph_osd_event_work *event_work; p = msg->front.iov_base; end = p + msg->front.iov_len; ceph_decode_8_safe(&p, end, proto_ver, bad); ceph_decode_8_safe(&p, end, opcode, bad); ceph_decode_64_safe(&p, end, cookie, bad); ceph_decode_64_safe(&p, end, ver, bad); ceph_decode_64_safe(&p, end, notify_id, bad); spin_lock(&osdc->event_lock); event = __find_event(osdc, cookie); if (event) { get_event(event); if (event->one_shot) __remove_event(event); } spin_unlock(&osdc->event_lock); dout("handle_watch_notify cookie %lld ver %lld event %p\n", cookie, ver, event); if (event) { event_work = kmalloc(sizeof(*event_work), GFP_NOIO); if (!event_work) { dout("ERROR: could not allocate event_work\n"); goto done_err; } INIT_WORK(&event_work->work, do_event_work); event_work->event = event; event_work->ver = ver; event_work->notify_id = notify_id; event_work->opcode = opcode; if (!queue_work(osdc->notify_wq, &event_work->work)) { dout("WARNING: failed to queue notify event work\n"); goto done_err; } } return; done_err: complete(&event->completion); ceph_osdc_put_event(event); return; bad: pr_err("osdc handle_watch_notify corrupt msg\n"); return; } int ceph_osdc_wait_event(struct ceph_osd_event *event, unsigned long timeout) { int err; dout("wait_event %p\n", event); err = wait_for_completion_interruptible_timeout(&event->completion, timeout * HZ); ceph_osdc_put_event(event); if (err > 0) err = 0; dout("wait_event %p returns %d\n", event, err); return err; } EXPORT_SYMBOL(ceph_osdc_wait_event); /* * Register request, send initial attempt. */ int ceph_osdc_start_request(struct ceph_osd_client *osdc, 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; #ifdef CONFIG_BLOCK req->r_request->bio = req->r_bio; #endif req->r_request->trail = req->r_trail; 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 = __map_request(osdc, req, 0); if (rc < 0) { if (nofail) { dout("osdc_start_request failed map, " " will retry %lld\n", req->r_tid); rc = 0; } goto out_unlock; } if (req->r_osd == NULL) { dout("send_request %p no up osds in pg\n", req); ceph_monc_request_next_osdmap(&osdc->client->monc); } else { __send_request(osdc, req); } rc = 0; } out_unlock: mutex_unlock(&osdc->request_mutex); up_read(&osdc->map_sem); return rc; } EXPORT_SYMBOL(ceph_osdc_start_request); /* * 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); complete_request(req); 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; } EXPORT_SYMBOL(ceph_osdc_wait_request); /* * 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); } EXPORT_SYMBOL(ceph_osdc_sync); /* * 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); INIT_LIST_HEAD(&osdc->req_unsent); INIT_LIST_HEAD(&osdc->req_notarget); INIT_LIST_HEAD(&osdc->req_linger); osdc->num_requests = 0; INIT_DELAYED_WORK(&osdc->timeout_work, handle_timeout); INIT_DELAYED_WORK(&osdc->osds_timeout_work, handle_osds_timeout); spin_lock_init(&osdc->event_lock); osdc->event_tree = RB_ROOT; osdc->event_count = 0; schedule_delayed_work(&osdc->osds_timeout_work, round_jiffies_relative(osdc->client->options->osd_idle_ttl * HZ)); 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; osdc->notify_wq = create_singlethread_workqueue("ceph-watch-notify"); if (IS_ERR(osdc->notify_wq)) { err = PTR_ERR(osdc->notify_wq); osdc->notify_wq = NULL; goto out_msgpool; } return 0; out_msgpool: ceph_msgpool_destroy(&osdc->msgpool_op); out_mempool: mempool_destroy(osdc->req_mempool); out: return err; } EXPORT_SYMBOL(ceph_osdc_init); void ceph_osdc_stop(struct ceph_osd_client *osdc) { flush_workqueue(osdc->notify_wq); destroy_workqueue(osdc->notify_wq); cancel_delayed_work_sync(&osdc->timeout_work); cancel_delayed_work_sync(&osdc->osds_timeout_work); if (osdc->osdmap) { ceph_osdmap_destroy(osdc->osdmap); osdc->osdmap = NULL; } remove_all_osds(osdc); mempool_destroy(osdc->req_mempool); ceph_msgpool_destroy(&osdc->msgpool_op); ceph_msgpool_destroy(&osdc->msgpool_op_reply); } EXPORT_SYMBOL(ceph_osdc_stop); /* * 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, int page_align) { 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, page_align); if (!req) return -ENOMEM; /* it may be a short read due to an object boundary */ req->r_pages = pages; dout("readpages final extent is %llu~%llu (%d pages align %d)\n", off, *plen, req->r_num_pages, page_align); 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; } EXPORT_SYMBOL(ceph_osdc_readpages); /* * 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; int page_align = off & ~PAGE_MASK; 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, page_align); if (!req) return -ENOMEM; /* it may be a short write due to an object boundary */ req->r_pages = pages; 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; } EXPORT_SYMBOL(ceph_osdc_writepages); /* * 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) goto out; 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; case CEPH_MSG_WATCH_NOTIFY: handle_watch_notify(osdc, msg); break; default: pr_err("received unknown message type %d %s\n", type, ceph_msg_type_name(type)); } out: 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, false); 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) { int want = calc_pages_for(req->r_page_alignment, data_len); if (unlikely(req->r_num_pages < want)) { pr_warning("tid %lld reply has %d bytes %d pages, we" " had only %d pages ready\n", tid, data_len, want, req->r_num_pages); *skip = 1; ceph_msg_put(m); m = NULL; goto out; } m->pages = req->r_pages; m->nr_pages = req->r_num_pages; m->page_alignment = req->r_page_alignment; #ifdef CONFIG_BLOCK m->bio = req->r_bio; #endif } *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: case CEPH_MSG_WATCH_NOTIFY: return ceph_msg_new(type, front, GFP_NOFS, false); 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, };