diff options
Diffstat (limited to 'net/ceph/osd_client.c')
| -rw-r--r-- | net/ceph/osd_client.c | 2175 |
1 files changed, 2175 insertions, 0 deletions
diff --git a/net/ceph/osd_client.c b/net/ceph/osd_client.c new file mode 100644 index 00000000..5e254055 --- /dev/null +++ b/net/ceph/osd_client.c @@ -0,0 +1,2175 @@ +#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, +}; 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